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[tor-commits] [tor/master] Merge remote-tracking branch 'tor-github/pr/726' into maint-0.3.5



commit cb084de5e5dddee69abd55e3f4ed3a5ce9ebc9a2
Merge: 2ae67fee4 1b9e77349
Author: teor <teor@xxxxxxxxxxxxxx>
Date:   Fri Apr 19 11:51:05 2019 +1000

    Merge remote-tracking branch 'tor-github/pr/726' into maint-0.3.5

 changes/bug13221        | 5 +++++
 src/app/config/config.c | 8 ++++----
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --cc src/app/config/config.c
index e06c77e43,000000000..2a504d306
mode 100644,000000..100644
--- a/src/app/config/config.c
+++ b/src/app/config/config.c
@@@ -1,8507 -1,0 +1,8507 @@@
 +/* Copyright (c) 2001 Matej Pfajfar.
 + * Copyright (c) 2001-2004, Roger Dingledine.
 + * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 + * Copyright (c) 2007-2019, The Tor Project, Inc. */
 +/* See LICENSE for licensing information */
 +
 +/**
 + * \file config.c
 + * \brief Code to interpret the user's configuration of Tor.
 + *
 + * This module handles torrc configuration file, including parsing it,
 + * combining it with torrc.defaults and the command line, allowing
 + * user changes to it (via editing and SIGHUP or via the control port),
 + * writing it back to disk (because of SAVECONF from the control port),
 + * and -- most importantly, acting on it.
 + *
 + * The module additionally has some tools for manipulating and
 + * inspecting values that are calculated as a result of the
 + * configured options.
 + *
 + * <h3>How to add new options</h3>
 + *
 + * To add new items to the torrc, there are a minimum of three places to edit:
 + * <ul>
 + *   <li>The or_options_t structure in or.h, where the options are stored.
 + *   <li>The option_vars_ array below in this module, which configures
 + *       the names of the torrc options, their types, their multiplicities,
 + *       and their mappings to fields in or_options_t.
 + *   <li>The manual in doc/tor.1.txt, to document what the new option
 + *       is, and how it works.
 + * </ul>
 + *
 + * Additionally, you might need to edit these places too:
 + * <ul>
 + *   <li>options_validate() below, in case you want to reject some possible
 + *       values of the new configuration option.
 + *   <li>options_transition_allowed() below, in case you need to
 + *       forbid some or all changes in the option while Tor is
 + *       running.
 + *   <li>options_transition_affects_workers(), in case changes in the option
 + *       might require Tor to relaunch or reconfigure its worker threads.
 + *   <li>options_transition_affects_descriptor(), in case changes in the
 + *       option might require a Tor relay to build and publish a new server
 + *       descriptor.
 + *   <li>options_act() and/or options_act_reversible(), in case there's some
 + *       action that needs to be taken immediately based on the option's
 + *       value.
 + * </ul>
 + *
 + * <h3>Changing the value of an option</h3>
 + *
 + * Because of the SAVECONF command from the control port, it's a bad
 + * idea to change the value of any user-configured option in the
 + * or_options_t.  If you want to sometimes do this anyway, we recommend
 + * that you create a secondary field in or_options_t; that you have the
 + * user option linked only to the secondary field; that you use the
 + * secondary field to initialize the one that Tor actually looks at; and that
 + * you use the one Tor looks as the one that you modify.
 + **/
 +
 +#define CONFIG_PRIVATE
 +#include "core/or/or.h"
 +#include "app/config/config.h"
 +#include "app/config/confparse.h"
 +#include "app/config/statefile.h"
 +#include "app/main/main.h"
 +#include "core/mainloop/connection.h"
 +#include "core/mainloop/cpuworker.h"
 +#include "core/mainloop/mainloop.h"
 +#include "core/mainloop/netstatus.h"
 +#include "core/or/channel.h"
 +#include "core/or/circuitbuild.h"
 +#include "core/or/circuitlist.h"
 +#include "core/or/circuitmux.h"
 +#include "core/or/circuitmux_ewma.h"
 +#include "core/or/circuitstats.h"
 +#include "core/or/connection_edge.h"
 +#include "core/or/connection_or.h"
 +#include "core/or/dos.h"
 +#include "core/or/policies.h"
 +#include "core/or/relay.h"
 +#include "core/or/scheduler.h"
 +#include "feature/client/addressmap.h"
 +#include "feature/client/bridges.h"
 +#include "feature/client/entrynodes.h"
 +#include "feature/client/transports.h"
 +#include "feature/control/control.h"
 +#include "feature/dirauth/bwauth.h"
 +#include "feature/dirauth/guardfraction.h"
 +#include "feature/dircache/consdiffmgr.h"
 +#include "feature/dircache/dirserv.h"
 +#include "feature/dircommon/voting_schedule.h"
 +#include "feature/hibernate/hibernate.h"
 +#include "feature/hs/hs_config.h"
 +#include "feature/nodelist/dirlist.h"
 +#include "feature/nodelist/networkstatus.h"
 +#include "feature/nodelist/nickname.h"
 +#include "feature/nodelist/nodelist.h"
 +#include "feature/nodelist/routerlist.h"
 +#include "feature/nodelist/routerset.h"
 +#include "feature/relay/dns.h"
 +#include "feature/relay/ext_orport.h"
 +#include "feature/relay/routermode.h"
 +#include "feature/rend/rendclient.h"
 +#include "feature/rend/rendservice.h"
 +#include "lib/geoip/geoip.h"
 +#include "feature/stats/geoip_stats.h"
 +#include "feature/stats/predict_ports.h"
 +#include "feature/stats/rephist.h"
 +#include "lib/compress/compress.h"
 +#include "lib/crypt_ops/crypto_init.h"
 +#include "lib/crypt_ops/crypto_rand.h"
 +#include "lib/crypt_ops/crypto_util.h"
 +#include "lib/encoding/confline.h"
 +#include "lib/log/git_revision.h"
 +#include "lib/net/resolve.h"
 +#include "lib/sandbox/sandbox.h"
 +
 +#ifdef ENABLE_NSS
 +#include "lib/crypt_ops/crypto_nss_mgt.h"
 +#else
 +#include "lib/crypt_ops/crypto_openssl_mgt.h"
 +#endif
 +
 +#ifdef _WIN32
 +#include <shlobj.h>
 +#endif
 +#ifdef HAVE_FCNTL_H
 +#include <fcntl.h>
 +#endif
 +#ifdef HAVE_SYS_STAT_H
 +#include <sys/stat.h>
 +#endif
 +#ifdef HAVE_SYS_PARAM_H
 +#include <sys/param.h>
 +#endif
 +#ifdef HAVE_UNISTD_H
 +#include <unistd.h>
 +#endif
 +
 +#include "lib/meminfo/meminfo.h"
 +#include "lib/osinfo/uname.h"
 +#include "lib/process/daemon.h"
 +#include "lib/process/pidfile.h"
 +#include "lib/process/restrict.h"
 +#include "lib/process/setuid.h"
 +#include "lib/process/subprocess.h"
 +#include "lib/net/gethostname.h"
 +#include "lib/thread/numcpus.h"
 +
 +#include "lib/encoding/keyval.h"
 +#include "lib/fs/conffile.h"
 +#include "lib/evloop/procmon.h"
 +
 +#include "feature/dirauth/dirvote.h"
 +#include "feature/dirauth/recommend_pkg.h"
 +#include "feature/dirauth/authmode.h"
 +
 +#include "core/or/connection_st.h"
 +#include "core/or/port_cfg_st.h"
 +
 +#ifdef HAVE_SYSTEMD
 +#   if defined(__COVERITY__) && !defined(__INCLUDE_LEVEL__)
 +/* Systemd's use of gcc's __INCLUDE_LEVEL__ extension macro appears to confuse
 + * Coverity. Here's a kludge to unconfuse it.
 + */
 +#   define __INCLUDE_LEVEL__ 2
 +#endif /* defined(__COVERITY__) && !defined(__INCLUDE_LEVEL__) */
 +#include <systemd/sd-daemon.h>
 +#endif /* defined(HAVE_SYSTEMD) */
 +
 +/* Prefix used to indicate a Unix socket in a FooPort configuration. */
 +static const char unix_socket_prefix[] = "unix:";
 +/* Prefix used to indicate a Unix socket with spaces in it, in a FooPort
 + * configuration. */
 +static const char unix_q_socket_prefix[] = "unix:\"";
 +
 +/* limits for TCP send and recv buffer size used for constrained sockets */
 +#define MIN_CONSTRAINED_TCP_BUFFER 2048
 +#define MAX_CONSTRAINED_TCP_BUFFER 262144  /* 256k */
 +
 +/** macro to help with the bulk rename of *DownloadSchedule to
 + * *DowloadInitialDelay . */
 +#define DOWNLOAD_SCHEDULE(name) \
 +  { #name "DownloadSchedule", #name "DownloadInitialDelay", 0, 1 }
 +
 +/** A list of abbreviations and aliases to map command-line options, obsolete
 + * option names, or alternative option names, to their current values. */
 +static config_abbrev_t option_abbrevs_[] = {
 +  PLURAL(AuthDirBadDirCC),
 +  PLURAL(AuthDirBadExitCC),
 +  PLURAL(AuthDirInvalidCC),
 +  PLURAL(AuthDirRejectCC),
 +  PLURAL(EntryNode),
 +  PLURAL(ExcludeNode),
 +  PLURAL(FirewallPort),
 +  PLURAL(LongLivedPort),
 +  PLURAL(HiddenServiceNode),
 +  PLURAL(HiddenServiceExcludeNode),
 +  PLURAL(NumCPU),
 +  PLURAL(RendNode),
 +  PLURAL(RecommendedPackage),
 +  PLURAL(RendExcludeNode),
 +  PLURAL(StrictEntryNode),
 +  PLURAL(StrictExitNode),
 +  PLURAL(StrictNode),
 +  { "l", "Log", 1, 0},
 +  { "AllowUnverifiedNodes", "AllowInvalidNodes", 0, 0},
 +  { "AutomapHostSuffixes", "AutomapHostsSuffixes", 0, 0},
 +  { "AutomapHostOnResolve", "AutomapHostsOnResolve", 0, 0},
 +  { "BandwidthRateBytes", "BandwidthRate", 0, 0},
 +  { "BandwidthBurstBytes", "BandwidthBurst", 0, 0},
 +  { "DirFetchPostPeriod", "StatusFetchPeriod", 0, 0},
 +  { "DirServer", "DirAuthority", 0, 0}, /* XXXX later, make this warn? */
 +  { "MaxConn", "ConnLimit", 0, 1},
 +  { "MaxMemInCellQueues", "MaxMemInQueues", 0, 0},
 +  { "ORBindAddress", "ORListenAddress", 0, 0},
 +  { "DirBindAddress", "DirListenAddress", 0, 0},
 +  { "SocksBindAddress", "SocksListenAddress", 0, 0},
 +  { "UseHelperNodes", "UseEntryGuards", 0, 0},
 +  { "NumHelperNodes", "NumEntryGuards", 0, 0},
 +  { "UseEntryNodes", "UseEntryGuards", 0, 0},
 +  { "NumEntryNodes", "NumEntryGuards", 0, 0},
 +  { "ResolvConf", "ServerDNSResolvConfFile", 0, 1},
 +  { "SearchDomains", "ServerDNSSearchDomains", 0, 1},
 +  { "ServerDNSAllowBrokenResolvConf", "ServerDNSAllowBrokenConfig", 0, 0},
 +  { "PreferTunnelledDirConns", "PreferTunneledDirConns", 0, 0},
 +  { "BridgeAuthoritativeDirectory", "BridgeAuthoritativeDir", 0, 0},
 +  { "HashedControlPassword", "__HashedControlSessionPassword", 1, 0},
 +  { "VirtualAddrNetwork", "VirtualAddrNetworkIPv4", 0, 0},
 +  { "SocksSocketsGroupWritable", "UnixSocksGroupWritable", 0, 1},
 +  { "_HSLayer2Nodes", "HSLayer2Nodes", 0, 1 },
 +  { "_HSLayer3Nodes", "HSLayer3Nodes", 0, 1 },
 +
 +  DOWNLOAD_SCHEDULE(ClientBootstrapConsensusAuthority),
 +  DOWNLOAD_SCHEDULE(ClientBootstrapConsensusAuthorityOnly),
 +  DOWNLOAD_SCHEDULE(ClientBootstrapConsensusFallback),
 +  DOWNLOAD_SCHEDULE(TestingBridge),
 +  DOWNLOAD_SCHEDULE(TestingBridgeBootstrap),
 +  DOWNLOAD_SCHEDULE(TestingClient),
 +  DOWNLOAD_SCHEDULE(TestingClientConsensus),
 +  DOWNLOAD_SCHEDULE(TestingServer),
 +  DOWNLOAD_SCHEDULE(TestingServerConsensus),
 +
 +  { NULL, NULL, 0, 0},
 +};
 +
 +/** dummy instance of or_options_t, used for type-checking its
 + * members with CONF_CHECK_VAR_TYPE. */
 +DUMMY_TYPECHECK_INSTANCE(or_options_t);
 +
 +/** An entry for config_vars: "The option <b>name</b> has type
 + * CONFIG_TYPE_<b>conftype</b>, and corresponds to
 + * or_options_t.<b>member</b>"
 + */
 +#define VAR(name,conftype,member,initvalue)                             \
 +  { name, CONFIG_TYPE_ ## conftype, offsetof(or_options_t, member),     \
 +      initvalue CONF_TEST_MEMBERS(or_options_t, conftype, member) }
 +/** As VAR, but the option name and member name are the same. */
 +#define V(member,conftype,initvalue)                                    \
 +  VAR(#member, conftype, member, initvalue)
 +/** An entry for config_vars: "The option <b>name</b> is obsolete." */
 +#ifdef TOR_UNIT_TESTS
 +#define OBSOLETE(name) { name, CONFIG_TYPE_OBSOLETE, 0, NULL, {.INT=NULL} }
 +#else
 +#define OBSOLETE(name) { name, CONFIG_TYPE_OBSOLETE, 0, NULL }
 +#endif
 +
 +/**
 + * Macro to declare *Port options.  Each one comes in three entries.
 + * For example, most users should use "SocksPort" to configure the
 + * socks port, but TorBrowser wants to use __SocksPort so that it
 + * isn't stored by SAVECONF.  The SocksPortLines virtual option is
 + * used to query both options from the controller.
 + */
 +#define VPORT(member)                                           \
 +  VAR(#member "Lines", LINELIST_V, member ## _lines, NULL),     \
 +  VAR(#member, LINELIST_S, member ## _lines, NULL),             \
 +  VAR("__" #member, LINELIST_S, member ## _lines, NULL)
 +
 +/** UINT64_MAX as a decimal string */
 +#define UINT64_MAX_STRING "18446744073709551615"
 +
 +/** Array of configuration options.  Until we disallow nonstandard
 + * abbreviations, order is significant, since the first matching option will
 + * be chosen first.
 + */
 +static config_var_t option_vars_[] = {
 +  V(AccountingMax,               MEMUNIT,  "0 bytes"),
 +  VAR("AccountingRule",          STRING,   AccountingRule_option,  "max"),
 +  V(AccountingStart,             STRING,   NULL),
 +  V(Address,                     STRING,   NULL),
 +  OBSOLETE("AllowDotExit"),
 +  OBSOLETE("AllowInvalidNodes"),
 +  V(AllowNonRFC953Hostnames,     BOOL,     "0"),
 +  OBSOLETE("AllowSingleHopCircuits"),
 +  OBSOLETE("AllowSingleHopExits"),
 +  V(AlternateBridgeAuthority,    LINELIST, NULL),
 +  V(AlternateDirAuthority,       LINELIST, NULL),
 +  OBSOLETE("AlternateHSAuthority"),
 +  V(AssumeReachable,             BOOL,     "0"),
 +  OBSOLETE("AuthDirBadDir"),
 +  OBSOLETE("AuthDirBadDirCCs"),
 +  V(AuthDirBadExit,              LINELIST, NULL),
 +  V(AuthDirBadExitCCs,           CSV,      ""),
 +  V(AuthDirInvalid,              LINELIST, NULL),
 +  V(AuthDirInvalidCCs,           CSV,      ""),
 +  V(AuthDirFastGuarantee,        MEMUNIT,  "100 KB"),
 +  V(AuthDirGuardBWGuarantee,     MEMUNIT,  "2 MB"),
 +  V(AuthDirPinKeys,              BOOL,     "1"),
 +  V(AuthDirReject,               LINELIST, NULL),
 +  V(AuthDirRejectCCs,            CSV,      ""),
 +  OBSOLETE("AuthDirRejectUnlisted"),
 +  OBSOLETE("AuthDirListBadDirs"),
 +  V(AuthDirListBadExits,         BOOL,     "0"),
 +  V(AuthDirMaxServersPerAddr,    UINT,     "2"),
 +  OBSOLETE("AuthDirMaxServersPerAuthAddr"),
 +  V(AuthDirHasIPv6Connectivity,  BOOL,     "0"),
 +  VAR("AuthoritativeDirectory",  BOOL, AuthoritativeDir,    "0"),
 +  V(AutomapHostsOnResolve,       BOOL,     "0"),
 +  V(AutomapHostsSuffixes,        CSV,      ".onion,.exit"),
 +  V(AvoidDiskWrites,             BOOL,     "0"),
 +  V(BandwidthBurst,              MEMUNIT,  "1 GB"),
 +  V(BandwidthRate,               MEMUNIT,  "1 GB"),
 +  V(BridgeAuthoritativeDir,      BOOL,     "0"),
 +  VAR("Bridge",                  LINELIST, Bridges,    NULL),
 +  V(BridgePassword,              STRING,   NULL),
 +  V(BridgeRecordUsageByCountry,  BOOL,     "1"),
 +  V(BridgeRelay,                 BOOL,     "0"),
 +  V(BridgeDistribution,          STRING,   NULL),
 +  VAR("CacheDirectory",          FILENAME, CacheDirectory_option, NULL),
 +  V(CacheDirectoryGroupReadable, AUTOBOOL,     "auto"),
 +  V(CellStatistics,              BOOL,     "0"),
 +  V(PaddingStatistics,           BOOL,     "1"),
 +  V(LearnCircuitBuildTimeout,    BOOL,     "1"),
 +  V(CircuitBuildTimeout,         INTERVAL, "0"),
 +  OBSOLETE("CircuitIdleTimeout"),
 +  V(CircuitsAvailableTimeout,    INTERVAL, "0"),
 +  V(CircuitStreamTimeout,        INTERVAL, "0"),
 +  V(CircuitPriorityHalflife,     DOUBLE,  "-1.0"), /*negative:'Use default'*/
 +  V(ClientDNSRejectInternalAddresses, BOOL,"1"),
 +  V(ClientOnly,                  BOOL,     "0"),
 +  V(ClientPreferIPv6ORPort,      AUTOBOOL, "auto"),
 +  V(ClientPreferIPv6DirPort,     AUTOBOOL, "auto"),
 +  V(ClientRejectInternalAddresses, BOOL,   "1"),
 +  V(ClientTransportPlugin,       LINELIST, NULL),
 +  V(ClientUseIPv6,               BOOL,     "0"),
 +  V(ClientUseIPv4,               BOOL,     "1"),
 +  V(ConsensusParams,             STRING,   NULL),
 +  V(ConnLimit,                   UINT,     "1000"),
 +  V(ConnDirectionStatistics,     BOOL,     "0"),
 +  V(ConstrainedSockets,          BOOL,     "0"),
 +  V(ConstrainedSockSize,         MEMUNIT,  "8192"),
 +  V(ContactInfo,                 STRING,   NULL),
 +  OBSOLETE("ControlListenAddress"),
 +  VPORT(ControlPort),
 +  V(ControlPortFileGroupReadable,BOOL,     "0"),
 +  V(ControlPortWriteToFile,      FILENAME, NULL),
 +  V(ControlSocket,               LINELIST, NULL),
 +  V(ControlSocketsGroupWritable, BOOL,     "0"),
 +  V(UnixSocksGroupWritable,    BOOL,     "0"),
 +  V(CookieAuthentication,        BOOL,     "0"),
 +  V(CookieAuthFileGroupReadable, BOOL,     "0"),
 +  V(CookieAuthFile,              STRING,   NULL),
 +  V(CountPrivateBandwidth,       BOOL,     "0"),
 +  VAR("DataDirectory",           FILENAME, DataDirectory_option, NULL),
 +  V(DataDirectoryGroupReadable,  BOOL,     "0"),
 +  V(DisableOOSCheck,             BOOL,     "1"),
 +  V(DisableNetwork,              BOOL,     "0"),
 +  V(DirAllowPrivateAddresses,    BOOL,     "0"),
 +  V(TestingAuthDirTimeToLearnReachability, INTERVAL, "30 minutes"),
 +  OBSOLETE("DirListenAddress"),
 +  V(DirPolicy,                   LINELIST, NULL),
 +  VPORT(DirPort),
 +  V(DirPortFrontPage,            FILENAME, NULL),
 +  VAR("DirReqStatistics",        BOOL,     DirReqStatistics_option, "1"),
 +  VAR("DirAuthority",            LINELIST, DirAuthorities, NULL),
 +  V(DirCache,                    BOOL,     "1"),
 +  /* A DirAuthorityFallbackRate of 0.1 means that 0.5% of clients try an
 +   * authority when all fallbacks are up, and 2% try an authority when 25% of
 +   * fallbacks are down. (We rebuild the list when 25% of fallbacks are down).
 +   *
 +   * We want to reduce load on authorities, but keep these two figures within
 +   * an order of magnitude, so there isn't too much load shifting to
 +   * authorities when fallbacks go down. */
 +  V(DirAuthorityFallbackRate,    DOUBLE,   "0.1"),
 +  V(DisableAllSwap,              BOOL,     "0"),
 +  V(DisableDebuggerAttachment,   BOOL,     "1"),
 +  OBSOLETE("DisableIOCP"),
 +  OBSOLETE("DisableV2DirectoryInfo_"),
 +  OBSOLETE("DynamicDHGroups"),
 +  VPORT(DNSPort),
 +  OBSOLETE("DNSListenAddress"),
 +  /* DoS circuit creation options. */
 +  V(DoSCircuitCreationEnabled,   AUTOBOOL, "auto"),
 +  V(DoSCircuitCreationMinConnections,      UINT, "0"),
 +  V(DoSCircuitCreationRate,      UINT,     "0"),
 +  V(DoSCircuitCreationBurst,     UINT,     "0"),
 +  V(DoSCircuitCreationDefenseType,         INT,  "0"),
 +  V(DoSCircuitCreationDefenseTimePeriod,   INTERVAL, "0"),
 +  /* DoS connection options. */
 +  V(DoSConnectionEnabled,        AUTOBOOL, "auto"),
 +  V(DoSConnectionMaxConcurrentCount,       UINT, "0"),
 +  V(DoSConnectionDefenseType,    INT,      "0"),
 +  /* DoS single hop client options. */
 +  V(DoSRefuseSingleHopClientRendezvous,    AUTOBOOL, "auto"),
 +  V(DownloadExtraInfo,           BOOL,     "0"),
 +  V(TestingEnableConnBwEvent,    BOOL,     "0"),
 +  V(TestingEnableCellStatsEvent, BOOL,     "0"),
 +  OBSOLETE("TestingEnableTbEmptyEvent"),
 +  V(EnforceDistinctSubnets,      BOOL,     "1"),
 +  V(EntryNodes,                  ROUTERSET,   NULL),
 +  V(EntryStatistics,             BOOL,     "0"),
 +  V(TestingEstimatedDescriptorPropagationTime, INTERVAL, "10 minutes"),
 +  V(ExcludeNodes,                ROUTERSET, NULL),
 +  V(ExcludeExitNodes,            ROUTERSET, NULL),
 +  OBSOLETE("ExcludeSingleHopRelays"),
 +  V(ExitNodes,                   ROUTERSET, NULL),
 +  V(ExitPolicy,                  LINELIST, NULL),
 +  V(ExitPolicyRejectPrivate,     BOOL,     "1"),
 +  V(ExitPolicyRejectLocalInterfaces, BOOL, "0"),
 +  V(ExitPortStatistics,          BOOL,     "0"),
 +  V(ExtendAllowPrivateAddresses, BOOL,     "0"),
 +  V(ExitRelay,                   AUTOBOOL, "auto"),
 +  VPORT(ExtORPort),
 +  V(ExtORPortCookieAuthFile,     STRING,   NULL),
 +  V(ExtORPortCookieAuthFileGroupReadable, BOOL, "0"),
 +  V(ExtraInfoStatistics,         BOOL,     "1"),
 +  V(ExtendByEd25519ID,           AUTOBOOL, "auto"),
 +  V(FallbackDir,                 LINELIST, NULL),
 +
 +  V(UseDefaultFallbackDirs,      BOOL,     "1"),
 +
 +  OBSOLETE("FallbackNetworkstatusFile"),
 +  V(FascistFirewall,             BOOL,     "0"),
 +  V(FirewallPorts,               CSV,      ""),
 +  OBSOLETE("FastFirstHopPK"),
 +  V(FetchDirInfoEarly,           BOOL,     "0"),
 +  V(FetchDirInfoExtraEarly,      BOOL,     "0"),
 +  V(FetchServerDescriptors,      BOOL,     "1"),
 +  V(FetchHidServDescriptors,     BOOL,     "1"),
 +  V(FetchUselessDescriptors,     BOOL,     "0"),
 +  OBSOLETE("FetchV2Networkstatus"),
 +  V(GeoIPExcludeUnknown,         AUTOBOOL, "auto"),
 +#ifdef _WIN32
 +  V(GeoIPFile,                   FILENAME, "<default>"),
 +  V(GeoIPv6File,                 FILENAME, "<default>"),
 +#else
 +  V(GeoIPFile,                   FILENAME,
 +    SHARE_DATADIR PATH_SEPARATOR "tor" PATH_SEPARATOR "geoip"),
 +  V(GeoIPv6File,                 FILENAME,
 +    SHARE_DATADIR PATH_SEPARATOR "tor" PATH_SEPARATOR "geoip6"),
 +#endif /* defined(_WIN32) */
 +  OBSOLETE("Group"),
 +  V(GuardLifetime,               INTERVAL, "0 minutes"),
 +  V(HardwareAccel,               BOOL,     "0"),
 +  V(HeartbeatPeriod,             INTERVAL, "6 hours"),
 +  V(MainloopStats,               BOOL,     "0"),
 +  V(AccelName,                   STRING,   NULL),
 +  V(AccelDir,                    FILENAME, NULL),
 +  V(HashedControlPassword,       LINELIST, NULL),
 +  OBSOLETE("HidServDirectoryV2"),
 +  VAR("HiddenServiceDir",    LINELIST_S, RendConfigLines,    NULL),
 +  VAR("HiddenServiceDirGroupReadable",  LINELIST_S, RendConfigLines, NULL),
 +  VAR("HiddenServiceOptions",LINELIST_V, RendConfigLines,    NULL),
 +  VAR("HiddenServicePort",   LINELIST_S, RendConfigLines,    NULL),
 +  VAR("HiddenServiceVersion",LINELIST_S, RendConfigLines,    NULL),
 +  VAR("HiddenServiceAuthorizeClient",LINELIST_S,RendConfigLines, NULL),
 +  VAR("HiddenServiceAllowUnknownPorts",LINELIST_S, RendConfigLines, NULL),
 +  VAR("HiddenServiceMaxStreams",LINELIST_S, RendConfigLines, NULL),
 +  VAR("HiddenServiceMaxStreamsCloseCircuit",LINELIST_S, RendConfigLines, NULL),
 +  VAR("HiddenServiceNumIntroductionPoints", LINELIST_S, RendConfigLines, NULL),
 +  VAR("HiddenServiceExportCircuitID", LINELIST_S,  RendConfigLines, NULL),
 +  VAR("HiddenServiceStatistics", BOOL, HiddenServiceStatistics_option, "1"),
 +  V(HidServAuth,                 LINELIST, NULL),
 +  V(ClientOnionAuthDir,          FILENAME, NULL),
 +  OBSOLETE("CloseHSClientCircuitsImmediatelyOnTimeout"),
 +  OBSOLETE("CloseHSServiceRendCircuitsImmediatelyOnTimeout"),
 +  V(HiddenServiceSingleHopMode,  BOOL,     "0"),
 +  V(HiddenServiceNonAnonymousMode,BOOL,    "0"),
 +  V(HTTPProxy,                   STRING,   NULL),
 +  V(HTTPProxyAuthenticator,      STRING,   NULL),
 +  V(HTTPSProxy,                  STRING,   NULL),
 +  V(HTTPSProxyAuthenticator,     STRING,   NULL),
 +  VPORT(HTTPTunnelPort),
 +  V(IPv6Exit,                    BOOL,     "0"),
 +  VAR("ServerTransportPlugin",   LINELIST, ServerTransportPlugin,  NULL),
 +  V(ServerTransportListenAddr,   LINELIST, NULL),
 +  V(ServerTransportOptions,      LINELIST, NULL),
 +  V(SigningKeyLifetime,          INTERVAL, "30 days"),
 +  V(Socks4Proxy,                 STRING,   NULL),
 +  V(Socks5Proxy,                 STRING,   NULL),
 +  V(Socks5ProxyUsername,         STRING,   NULL),
 +  V(Socks5ProxyPassword,         STRING,   NULL),
 +  VAR("KeyDirectory",            FILENAME, KeyDirectory_option, NULL),
 +  V(KeyDirectoryGroupReadable,   BOOL,     "0"),
 +  VAR("HSLayer2Nodes",           ROUTERSET,  HSLayer2Nodes,  NULL),
 +  VAR("HSLayer3Nodes",           ROUTERSET,  HSLayer3Nodes,  NULL),
 +  V(KeepalivePeriod,             INTERVAL, "5 minutes"),
 +  V(KeepBindCapabilities,            AUTOBOOL, "auto"),
 +  VAR("Log",                     LINELIST, Logs,             NULL),
 +  V(LogMessageDomains,           BOOL,     "0"),
 +  V(LogTimeGranularity,          MSEC_INTERVAL, "1 second"),
 +  V(TruncateLogFile,             BOOL,     "0"),
 +  V(SyslogIdentityTag,           STRING,   NULL),
 +  V(AndroidIdentityTag,          STRING,   NULL),
 +  V(LongLivedPorts,              CSV,
 +        "21,22,706,1863,5050,5190,5222,5223,6523,6667,6697,8300"),
 +  VAR("MapAddress",              LINELIST, AddressMap,           NULL),
 +  V(MaxAdvertisedBandwidth,      MEMUNIT,  "1 GB"),
 +  V(MaxCircuitDirtiness,         INTERVAL, "10 minutes"),
 +  V(MaxClientCircuitsPending,    UINT,     "32"),
 +  V(MaxConsensusAgeForDiffs,     INTERVAL, "0 seconds"),
 +  VAR("MaxMemInQueues",          MEMUNIT,   MaxMemInQueues_raw, "0"),
 +  OBSOLETE("MaxOnionsPending"),
 +  V(MaxOnionQueueDelay,          MSEC_INTERVAL, "1750 msec"),
 +  V(MaxUnparseableDescSizeToLog, MEMUNIT, "10 MB"),
 +  V(MinMeasuredBWsForAuthToIgnoreAdvertised, INT, "500"),
 +  VAR("MyFamily",                LINELIST, MyFamily_lines,       NULL),
 +  V(NewCircuitPeriod,            INTERVAL, "30 seconds"),
 +  OBSOLETE("NamingAuthoritativeDirectory"),
 +  OBSOLETE("NATDListenAddress"),
 +  VPORT(NATDPort),
 +  V(Nickname,                    STRING,   NULL),
 +  OBSOLETE("PredictedPortsRelevanceTime"),
 +  OBSOLETE("WarnUnsafeSocks"),
 +  VAR("NodeFamily",              LINELIST, NodeFamilies,         NULL),
 +  V(NoExec,                      BOOL,     "0"),
 +  V(NumCPUs,                     UINT,     "0"),
 +  V(NumDirectoryGuards,          UINT,     "0"),
 +  V(NumEntryGuards,              UINT,     "0"),
 +  V(NumPrimaryGuards,            UINT,     "0"),
 +  V(OfflineMasterKey,            BOOL,     "0"),
 +  OBSOLETE("ORListenAddress"),
 +  VPORT(ORPort),
 +  V(OutboundBindAddress,         LINELIST,   NULL),
 +  V(OutboundBindAddressOR,       LINELIST,   NULL),
 +  V(OutboundBindAddressExit,     LINELIST,   NULL),
 +
 +  OBSOLETE("PathBiasDisableRate"),
 +  V(PathBiasCircThreshold,       INT,      "-1"),
 +  V(PathBiasNoticeRate,          DOUBLE,   "-1"),
 +  V(PathBiasWarnRate,            DOUBLE,   "-1"),
 +  V(PathBiasExtremeRate,         DOUBLE,   "-1"),
 +  V(PathBiasScaleThreshold,      INT,      "-1"),
 +  OBSOLETE("PathBiasScaleFactor"),
 +  OBSOLETE("PathBiasMultFactor"),
 +  V(PathBiasDropGuards,          AUTOBOOL, "0"),
 +  OBSOLETE("PathBiasUseCloseCounts"),
 +
 +  V(PathBiasUseThreshold,       INT,      "-1"),
 +  V(PathBiasNoticeUseRate,          DOUBLE,   "-1"),
 +  V(PathBiasExtremeUseRate,         DOUBLE,   "-1"),
 +  V(PathBiasScaleUseThreshold,      INT,      "-1"),
 +
 +  V(PathsNeededToBuildCircuits,  DOUBLE,   "-1"),
 +  V(PerConnBWBurst,              MEMUNIT,  "0"),
 +  V(PerConnBWRate,               MEMUNIT,  "0"),
 +  V(PidFile,                     STRING,   NULL),
 +  V(TestingTorNetwork,           BOOL,     "0"),
 +  V(TestingMinExitFlagThreshold, MEMUNIT,  "0"),
 +  V(TestingMinFastFlagThreshold, MEMUNIT,  "0"),
 +
 +  V(TestingLinkCertLifetime,          INTERVAL, "2 days"),
 +  V(TestingAuthKeyLifetime,          INTERVAL, "2 days"),
 +  V(TestingLinkKeySlop,              INTERVAL, "3 hours"),
 +  V(TestingAuthKeySlop,              INTERVAL, "3 hours"),
 +  V(TestingSigningKeySlop,           INTERVAL, "1 day"),
 +
 +  V(OptimisticData,              AUTOBOOL, "auto"),
 +  OBSOLETE("PortForwarding"),
 +  OBSOLETE("PortForwardingHelper"),
 +  OBSOLETE("PreferTunneledDirConns"),
 +  V(ProtocolWarnings,            BOOL,     "0"),
 +  V(PublishServerDescriptor,     CSV,      "1"),
 +  V(PublishHidServDescriptors,   BOOL,     "1"),
 +  V(ReachableAddresses,          LINELIST, NULL),
 +  V(ReachableDirAddresses,       LINELIST, NULL),
 +  V(ReachableORAddresses,        LINELIST, NULL),
 +  V(RecommendedVersions,         LINELIST, NULL),
 +  V(RecommendedClientVersions,   LINELIST, NULL),
 +  V(RecommendedServerVersions,   LINELIST, NULL),
 +  V(RecommendedPackages,         LINELIST, NULL),
 +  V(ReducedConnectionPadding,    BOOL,     "0"),
 +  V(ConnectionPadding,           AUTOBOOL, "auto"),
 +  V(RefuseUnknownExits,          AUTOBOOL, "auto"),
 +  V(RejectPlaintextPorts,        CSV,      ""),
 +  V(RelayBandwidthBurst,         MEMUNIT,  "0"),
 +  V(RelayBandwidthRate,          MEMUNIT,  "0"),
 +  V(RendPostPeriod,              INTERVAL, "1 hour"),
 +  V(RephistTrackTime,            INTERVAL, "24 hours"),
 +  V(RunAsDaemon,                 BOOL,     "0"),
 +  V(ReducedExitPolicy,           BOOL,     "0"),
 +  OBSOLETE("RunTesting"), // currently unused
 +  V(Sandbox,                     BOOL,     "0"),
 +  V(SafeLogging,                 STRING,   "1"),
 +  V(SafeSocks,                   BOOL,     "0"),
 +  V(ServerDNSAllowBrokenConfig,  BOOL,     "1"),
 +  V(ServerDNSAllowNonRFC953Hostnames, BOOL,"0"),
 +  V(ServerDNSDetectHijacking,    BOOL,     "1"),
 +  V(ServerDNSRandomizeCase,      BOOL,     "1"),
 +  V(ServerDNSResolvConfFile,     STRING,   NULL),
 +  V(ServerDNSSearchDomains,      BOOL,     "0"),
 +  V(ServerDNSTestAddresses,      CSV,
 +      "www.google.com,www.mit.edu,www.yahoo.com,www.slashdot.org"),
 +  OBSOLETE("SchedulerLowWaterMark__"),
 +  OBSOLETE("SchedulerHighWaterMark__"),
 +  OBSOLETE("SchedulerMaxFlushCells__"),
 +  V(KISTSchedRunInterval,        MSEC_INTERVAL, "0 msec"),
 +  V(KISTSockBufSizeFactor,       DOUBLE,   "1.0"),
 +  V(Schedulers,                  CSV,      "KIST,KISTLite,Vanilla"),
 +  V(ShutdownWaitLength,          INTERVAL, "30 seconds"),
 +  OBSOLETE("SocksListenAddress"),
 +  V(SocksPolicy,                 LINELIST, NULL),
 +  VPORT(SocksPort),
 +  V(SocksTimeout,                INTERVAL, "2 minutes"),
 +  V(SSLKeyLifetime,              INTERVAL, "0"),
 +  OBSOLETE("StrictEntryNodes"),
 +  OBSOLETE("StrictExitNodes"),
 +  V(StrictNodes,                 BOOL,     "0"),
 +  OBSOLETE("Support022HiddenServices"),
 +  V(TestSocks,                   BOOL,     "0"),
 +  V(TokenBucketRefillInterval,   MSEC_INTERVAL, "100 msec"),
 +  OBSOLETE("Tor2webMode"),
 +  OBSOLETE("Tor2webRendezvousPoints"),
 +  OBSOLETE("TLSECGroup"),
 +  V(TrackHostExits,              CSV,      NULL),
 +  V(TrackHostExitsExpire,        INTERVAL, "30 minutes"),
 +  OBSOLETE("TransListenAddress"),
 +  VPORT(TransPort),
 +  V(TransProxyType,              STRING,   "default"),
 +  OBSOLETE("TunnelDirConns"),
 +  V(UpdateBridgesFromAuthority,  BOOL,     "0"),
 +  V(UseBridges,                  BOOL,     "0"),
 +  VAR("UseEntryGuards",          BOOL,     UseEntryGuards_option, "1"),
 +  OBSOLETE("UseEntryGuardsAsDirGuards"),
 +  V(UseGuardFraction,            AUTOBOOL, "auto"),
 +  V(UseMicrodescriptors,         AUTOBOOL, "auto"),
 +  OBSOLETE("UseNTorHandshake"),
 +  V(User,                        STRING,   NULL),
 +  OBSOLETE("UserspaceIOCPBuffers"),
 +  V(AuthDirSharedRandomness,     BOOL,     "1"),
 +  V(AuthDirTestEd25519LinkKeys,  BOOL,     "1"),
 +  OBSOLETE("V1AuthoritativeDirectory"),
 +  OBSOLETE("V2AuthoritativeDirectory"),
 +  VAR("V3AuthoritativeDirectory",BOOL, V3AuthoritativeDir,   "0"),
 +  V(TestingV3AuthInitialVotingInterval, INTERVAL, "30 minutes"),
 +  V(TestingV3AuthInitialVoteDelay, INTERVAL, "5 minutes"),
 +  V(TestingV3AuthInitialDistDelay, INTERVAL, "5 minutes"),
 +  V(TestingV3AuthVotingStartOffset, INTERVAL, "0"),
 +  V(V3AuthVotingInterval,        INTERVAL, "1 hour"),
 +  V(V3AuthVoteDelay,             INTERVAL, "5 minutes"),
 +  V(V3AuthDistDelay,             INTERVAL, "5 minutes"),
 +  V(V3AuthNIntervalsValid,       UINT,     "3"),
 +  V(V3AuthUseLegacyKey,          BOOL,     "0"),
 +  V(V3BandwidthsFile,            FILENAME, NULL),
 +  V(GuardfractionFile,           FILENAME, NULL),
 +  VAR("VersioningAuthoritativeDirectory",BOOL,VersioningAuthoritativeDir, "0"),
 +  OBSOLETE("VoteOnHidServDirectoriesV2"),
 +  V(VirtualAddrNetworkIPv4,      STRING,   "127.192.0.0/10"),
 +  V(VirtualAddrNetworkIPv6,      STRING,   "[FE80::]/10"),
 +  V(WarnPlaintextPorts,          CSV,      "23,109,110,143"),
 +  OBSOLETE("UseFilteringSSLBufferevents"),
 +  OBSOLETE("__UseFilteringSSLBufferevents"),
 +  VAR("__ReloadTorrcOnSIGHUP",   BOOL,  ReloadTorrcOnSIGHUP,      "1"),
 +  VAR("__AllDirActionsPrivate",  BOOL,  AllDirActionsPrivate,     "0"),
 +  VAR("__DisablePredictedCircuits",BOOL,DisablePredictedCircuits, "0"),
 +  VAR("__DisableSignalHandlers", BOOL,  DisableSignalHandlers,    "0"),
 +  VAR("__LeaveStreamsUnattached",BOOL,  LeaveStreamsUnattached,   "0"),
 +  VAR("__HashedControlSessionPassword", LINELIST, HashedControlSessionPassword,
 +      NULL),
 +  VAR("__OwningControllerProcess",STRING,OwningControllerProcess, NULL),
 +  VAR("__OwningControllerFD", UINT64, OwningControllerFD, UINT64_MAX_STRING),
 +  V(MinUptimeHidServDirectoryV2, INTERVAL, "96 hours"),
 +  V(TestingServerDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(TestingClientDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(TestingServerConsensusDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(TestingClientConsensusDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  /* With the ClientBootstrapConsensus*Download* below:
 +   * Clients with only authorities will try:
 +   *  - at least 3 authorities over 10 seconds, then exponentially backoff,
 +   *    with the next attempt 3-21 seconds later,
 +   * Clients with authorities and fallbacks will try:
 +   *  - at least 2 authorities and 4 fallbacks over 21 seconds, then
 +   *    exponentially backoff, with the next attempts 4-33 seconds later,
 +   * Clients will also retry when an application request arrives.
 +   * After a number of failed requests, clients retry every 3 days + 1 hour.
 +   *
 +   * Clients used to try 2 authorities over 10 seconds, then wait for
 +   * 60 minutes or an application request.
 +   *
 +   * When clients have authorities and fallbacks available, they use these
 +   * schedules: (we stagger the times to avoid thundering herds) */
 +  V(ClientBootstrapConsensusAuthorityDownloadInitialDelay, CSV_INTERVAL, "6"),
 +  V(ClientBootstrapConsensusFallbackDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  /* When clients only have authorities available, they use this schedule: */
 +  V(ClientBootstrapConsensusAuthorityOnlyDownloadInitialDelay, CSV_INTERVAL,
 +    "0"),
 +  /* We don't want to overwhelm slow networks (or mirrors whose replies are
 +   * blocked), but we also don't want to fail if only some mirrors are
 +   * blackholed. Clients will try 3 directories simultaneously.
 +   * (Relays never use simultaneous connections.) */
 +  V(ClientBootstrapConsensusMaxInProgressTries, UINT, "3"),
 +  /* When a client has any running bridges, check each bridge occasionally,
 +    * whether or not that bridge is actually up. */
 +  V(TestingBridgeDownloadInitialDelay, CSV_INTERVAL,"10800"),
 +  /* When a client is just starting, or has no running bridges, check each
 +   * bridge a few times quickly, and then try again later. These schedules
 +   * are much longer than the other schedules, because we try each and every
 +   * configured bridge with this schedule. */
 +  V(TestingBridgeBootstrapDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(TestingClientMaxIntervalWithoutRequest, INTERVAL, "10 minutes"),
 +  V(TestingDirConnectionMaxStall, INTERVAL, "5 minutes"),
 +  OBSOLETE("TestingConsensusMaxDownloadTries"),
 +  OBSOLETE("ClientBootstrapConsensusMaxDownloadTries"),
 +  OBSOLETE("ClientBootstrapConsensusAuthorityOnlyMaxDownloadTries"),
 +  OBSOLETE("TestingDescriptorMaxDownloadTries"),
 +  OBSOLETE("TestingMicrodescMaxDownloadTries"),
 +  OBSOLETE("TestingCertMaxDownloadTries"),
 +  V(TestingDirAuthVoteExit, ROUTERSET, NULL),
 +  V(TestingDirAuthVoteExitIsStrict,  BOOL,     "0"),
 +  V(TestingDirAuthVoteGuard, ROUTERSET, NULL),
 +  V(TestingDirAuthVoteGuardIsStrict,  BOOL,     "0"),
 +  V(TestingDirAuthVoteHSDir, ROUTERSET, NULL),
 +  V(TestingDirAuthVoteHSDirIsStrict,  BOOL,     "0"),
 +  VAR("___UsingTestNetworkDefaults", BOOL, UsingTestNetworkDefaults_, "0"),
 +
 +  END_OF_CONFIG_VARS
 +};
 +
 +/** Override default values with these if the user sets the TestingTorNetwork
 + * option. */
 +static const config_var_t testing_tor_network_defaults[] = {
 +  V(DirAllowPrivateAddresses,    BOOL,     "1"),
 +  V(EnforceDistinctSubnets,      BOOL,     "0"),
 +  V(AssumeReachable,             BOOL,     "1"),
 +  V(AuthDirMaxServersPerAddr,    UINT,     "0"),
 +  V(ClientBootstrapConsensusAuthorityDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(ClientBootstrapConsensusFallbackDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(ClientBootstrapConsensusAuthorityOnlyDownloadInitialDelay, CSV_INTERVAL,
 +    "0"),
 +  V(ClientDNSRejectInternalAddresses, BOOL,"0"),
 +  V(ClientRejectInternalAddresses, BOOL,   "0"),
 +  V(CountPrivateBandwidth,       BOOL,     "1"),
 +  V(ExitPolicyRejectPrivate,     BOOL,     "0"),
 +  V(ExtendAllowPrivateAddresses, BOOL,     "1"),
 +  V(V3AuthVotingInterval,        INTERVAL, "5 minutes"),
 +  V(V3AuthVoteDelay,             INTERVAL, "20 seconds"),
 +  V(V3AuthDistDelay,             INTERVAL, "20 seconds"),
 +  V(TestingV3AuthInitialVotingInterval, INTERVAL, "150 seconds"),
 +  V(TestingV3AuthInitialVoteDelay, INTERVAL, "20 seconds"),
 +  V(TestingV3AuthInitialDistDelay, INTERVAL, "20 seconds"),
 +  V(TestingAuthDirTimeToLearnReachability, INTERVAL, "0 minutes"),
 +  V(TestingEstimatedDescriptorPropagationTime, INTERVAL, "0 minutes"),
 +  V(MinUptimeHidServDirectoryV2, INTERVAL, "0 minutes"),
 +  V(TestingServerDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(TestingClientDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(TestingServerConsensusDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(TestingClientConsensusDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(TestingBridgeDownloadInitialDelay, CSV_INTERVAL, "10"),
 +  V(TestingBridgeBootstrapDownloadInitialDelay, CSV_INTERVAL, "0"),
 +  V(TestingClientMaxIntervalWithoutRequest, INTERVAL, "5 seconds"),
 +  V(TestingDirConnectionMaxStall, INTERVAL, "30 seconds"),
 +  V(TestingEnableConnBwEvent,    BOOL,     "1"),
 +  V(TestingEnableCellStatsEvent, BOOL,     "1"),
 +  VAR("___UsingTestNetworkDefaults", BOOL, UsingTestNetworkDefaults_, "1"),
 +  V(RendPostPeriod,              INTERVAL, "2 minutes"),
 +
 +  END_OF_CONFIG_VARS
 +};
 +
 +#undef VAR
 +#undef V
 +#undef OBSOLETE
 +
 +static const config_deprecation_t option_deprecation_notes_[] = {
 +  /* Deprecated since 0.3.2.0-alpha. */
 +  { "HTTPProxy", "It only applies to direct unencrypted HTTP connections "
 +    "to your directory server, which your Tor probably wasn't using." },
 +  { "HTTPProxyAuthenticator", "HTTPProxy is deprecated in favor of HTTPSProxy "
 +    "which should be used with HTTPSProxyAuthenticator." },
 +  /* End of options deprecated since 0.3.2.1-alpha */
 +
 +  /* Options deprecated since 0.3.2.2-alpha */
 +  { "ReachableDirAddresses", "It has no effect on relays, and has had no "
 +    "effect on clients since 0.2.8." },
 +  { "ClientPreferIPv6DirPort", "It has no effect on relays, and has had no "
 +    "effect on clients since 0.2.8." },
 +  /* End of options deprecated since 0.3.2.2-alpha. */
 +
 +  { NULL, NULL }
 +};
 +
 +#ifdef _WIN32
 +static char *get_windows_conf_root(void);
 +#endif
 +static int options_act_reversible(const or_options_t *old_options, char **msg);
 +static int options_transition_allowed(const or_options_t *old,
 +                                      const or_options_t *new,
 +                                      char **msg);
 +static int options_transition_affects_workers(
 +      const or_options_t *old_options, const or_options_t *new_options);
 +static int options_transition_affects_descriptor(
 +      const or_options_t *old_options, const or_options_t *new_options);
 +static int options_transition_affects_dirauth_timing(
 +      const or_options_t *old_options, const or_options_t *new_options);
 +static int normalize_nickname_list(config_line_t **normalized_out,
 +                                   const config_line_t *lst, const char *name,
 +                                   char **msg);
 +static char *get_bindaddr_from_transport_listen_line(const char *line,
 +                                                     const char *transport);
 +static int parse_ports(or_options_t *options, int validate_only,
 +                              char **msg_out, int *n_ports_out,
 +                              int *world_writable_control_socket);
 +static int check_server_ports(const smartlist_t *ports,
 +                              const or_options_t *options,
 +                              int *num_low_ports_out);
 +static int validate_data_directories(or_options_t *options);
 +static int write_configuration_file(const char *fname,
 +                                    const or_options_t *options);
 +static int options_init_logs(const or_options_t *old_options,
 +                             or_options_t *options, int validate_only);
 +
 +static void init_libevent(const or_options_t *options);
 +static int opt_streq(const char *s1, const char *s2);
 +static int parse_outbound_addresses(or_options_t *options, int validate_only,
 +                                    char **msg);
 +static void config_maybe_load_geoip_files_(const or_options_t *options,
 +                                           const or_options_t *old_options);
 +static int options_validate_cb(void *old_options, void *options,
 +                               void *default_options,
 +                               int from_setconf, char **msg);
 +static void options_free_cb(void *options);
 +static void cleanup_protocol_warning_severity_level(void);
 +static void set_protocol_warning_severity_level(int warning_severity);
 +
 +/** Magic value for or_options_t. */
 +#define OR_OPTIONS_MAGIC 9090909
 +
 +/** Configuration format for or_options_t. */
 +STATIC config_format_t options_format = {
 +  sizeof(or_options_t),
 +  OR_OPTIONS_MAGIC,
 +  offsetof(or_options_t, magic_),
 +  option_abbrevs_,
 +  option_deprecation_notes_,
 +  option_vars_,
 +  options_validate_cb,
 +  options_free_cb,
 +  NULL
 +};
 +
 +/*
 + * Functions to read and write the global options pointer.
 + */
 +
 +/** Command-line and config-file options. */
 +static or_options_t *global_options = NULL;
 +/** The fallback options_t object; this is where we look for options not
 + * in torrc before we fall back to Tor's defaults. */
 +static or_options_t *global_default_options = NULL;
 +/** Name of most recently read torrc file. */
 +static char *torrc_fname = NULL;
 +/** Name of the most recently read torrc-defaults file.*/
 +static char *torrc_defaults_fname = NULL;
 +/** Configuration options set by command line. */
 +static config_line_t *global_cmdline_options = NULL;
 +/** Non-configuration options set by the command line */
 +static config_line_t *global_cmdline_only_options = NULL;
 +/** Boolean: Have we parsed the command line? */
 +static int have_parsed_cmdline = 0;
 +/** Contents of most recently read DirPortFrontPage file. */
 +static char *global_dirfrontpagecontents = NULL;
 +/** List of port_cfg_t for all configured ports. */
 +static smartlist_t *configured_ports = NULL;
 +/** True iff we're currently validating options, and any calls to
 + * get_options() are likely to be bugs. */
 +static int in_option_validation = 0;
 +/* True iff we've initialized libevent */
 +static int libevent_initialized = 0;
 +
 +/** Return the contents of our frontpage string, or NULL if not configured. */
 +MOCK_IMPL(const char*,
 +get_dirportfrontpage, (void))
 +{
 +  return global_dirfrontpagecontents;
 +}
 +
 +/** Returns the currently configured options. */
 +MOCK_IMPL(or_options_t *,
 +get_options_mutable, (void))
 +{
 +  tor_assert(global_options);
 +  tor_assert_nonfatal(! in_option_validation);
 +  return global_options;
 +}
 +
 +/** Returns the currently configured options */
 +MOCK_IMPL(const or_options_t *,
 +get_options,(void))
 +{
 +  return get_options_mutable();
 +}
 +
 +/** Change the current global options to contain <b>new_val</b> instead of
 + * their current value; take action based on the new value; free the old value
 + * as necessary.  Returns 0 on success, -1 on failure.
 + */
 +int
 +set_options(or_options_t *new_val, char **msg)
 +{
 +  int i;
 +  smartlist_t *elements;
 +  config_line_t *line;
 +  or_options_t *old_options = global_options;
 +  global_options = new_val;
 +  /* Note that we pass the *old* options below, for comparison. It
 +   * pulls the new options directly out of global_options. */
 +  if (options_act_reversible(old_options, msg)<0) {
 +    tor_assert(*msg);
 +    global_options = old_options;
 +    return -1;
 +  }
 +  if (options_act(old_options) < 0) { /* acting on the options failed. die. */
 +    if (! tor_event_loop_shutdown_is_pending()) {
 +      log_err(LD_BUG,
 +              "Acting on config options left us in a broken state. Dying.");
 +      tor_shutdown_event_loop_and_exit(1);
 +    }
 +    global_options = old_options;
 +    return -1;
 +  }
 +  /* Issues a CONF_CHANGED event to notify controller of the change. If Tor is
 +   * just starting up then the old_options will be undefined. */
 +  if (old_options && old_options != global_options) {
 +    elements = smartlist_new();
 +    for (i=0; options_format.vars[i].name; ++i) {
 +      const config_var_t *var = &options_format.vars[i];
 +      const char *var_name = var->name;
 +      if (var->type == CONFIG_TYPE_LINELIST_S ||
 +          var->type == CONFIG_TYPE_OBSOLETE) {
 +        continue;
 +      }
 +      if (!config_is_same(&options_format, new_val, old_options, var_name)) {
 +        line = config_get_assigned_option(&options_format, new_val,
 +                                          var_name, 1);
 +
 +        if (line) {
 +          config_line_t *next;
 +          for (; line; line = next) {
 +            next = line->next;
 +            smartlist_add(elements, line->key);
 +            smartlist_add(elements, line->value);
 +            tor_free(line);
 +          }
 +        } else {
 +          smartlist_add_strdup(elements, options_format.vars[i].name);
 +          smartlist_add(elements, NULL);
 +        }
 +      }
 +    }
 +    control_event_conf_changed(elements);
 +    SMARTLIST_FOREACH(elements, char *, cp, tor_free(cp));
 +    smartlist_free(elements);
 +  }
 +
 +  if (old_options != global_options) {
 +    or_options_free(old_options);
 +    /* If we are here it means we've successfully applied the new options and
 +     * that the global options have been changed to the new values. We'll
 +     * check if we need to remove or add periodic events. */
 +    periodic_events_on_new_options(global_options);
 +  }
 +
 +  return 0;
 +}
 +
 +/** The version of this Tor process, as parsed. */
 +static char *the_tor_version = NULL;
 +/** A shorter version of this Tor process's version, for export in our router
 + *  descriptor.  (Does not include the git version, if any.) */
 +static char *the_short_tor_version = NULL;
 +
 +/** Return the current Tor version. */
 +const char *
 +get_version(void)
 +{
 +  if (the_tor_version == NULL) {
 +    if (strlen(tor_git_revision)) {
 +      tor_asprintf(&the_tor_version, "%s (git-%s)", get_short_version(),
 +                   tor_git_revision);
 +    } else {
 +      the_tor_version = tor_strdup(get_short_version());
 +    }
 +  }
 +  return the_tor_version;
 +}
 +
 +/** Return the current Tor version, without any git tag. */
 +const char *
 +get_short_version(void)
 +{
 +
 +  if (the_short_tor_version == NULL) {
 +#ifdef TOR_BUILD_TAG
 +    tor_asprintf(&the_short_tor_version, "%s (%s)", VERSION, TOR_BUILD_TAG);
 +#else
 +    the_short_tor_version = tor_strdup(VERSION);
 +#endif
 +  }
 +  return the_short_tor_version;
 +}
 +
 +/** Release additional memory allocated in options
 + */
 +STATIC void
 +or_options_free_(or_options_t *options)
 +{
 +  if (!options)
 +    return;
 +
 +  routerset_free(options->ExcludeExitNodesUnion_);
 +  if (options->NodeFamilySets) {
 +    SMARTLIST_FOREACH(options->NodeFamilySets, routerset_t *,
 +                      rs, routerset_free(rs));
 +    smartlist_free(options->NodeFamilySets);
 +  }
 +  if (options->SchedulerTypes_) {
 +    SMARTLIST_FOREACH(options->SchedulerTypes_, int *, i, tor_free(i));
 +    smartlist_free(options->SchedulerTypes_);
 +  }
 +  if (options->FilesOpenedByIncludes) {
 +    SMARTLIST_FOREACH(options->FilesOpenedByIncludes, char *, f, tor_free(f));
 +    smartlist_free(options->FilesOpenedByIncludes);
 +  }
 +  tor_free(options->DataDirectory);
 +  tor_free(options->CacheDirectory);
 +  tor_free(options->KeyDirectory);
 +  tor_free(options->BridgePassword_AuthDigest_);
 +  tor_free(options->command_arg);
 +  tor_free(options->master_key_fname);
 +  config_free_lines(options->MyFamily);
 +  config_free(&options_format, options);
 +}
 +
 +/** Release all memory and resources held by global configuration structures.
 + */
 +void
 +config_free_all(void)
 +{
 +  or_options_free(global_options);
 +  global_options = NULL;
 +  or_options_free(global_default_options);
 +  global_default_options = NULL;
 +
 +  config_free_lines(global_cmdline_options);
 +  global_cmdline_options = NULL;
 +
 +  config_free_lines(global_cmdline_only_options);
 +  global_cmdline_only_options = NULL;
 +
 +  if (configured_ports) {
 +    SMARTLIST_FOREACH(configured_ports,
 +                      port_cfg_t *, p, port_cfg_free(p));
 +    smartlist_free(configured_ports);
 +    configured_ports = NULL;
 +  }
 +
 +  tor_free(torrc_fname);
 +  tor_free(torrc_defaults_fname);
 +  tor_free(global_dirfrontpagecontents);
 +
 +  tor_free(the_short_tor_version);
 +  tor_free(the_tor_version);
 +
 +  cleanup_protocol_warning_severity_level();
 +
 +  have_parsed_cmdline = 0;
 +  libevent_initialized = 0;
 +}
 +
 +/** Make <b>address</b> -- a piece of information related to our operation as
 + * a client -- safe to log according to the settings in options->SafeLogging,
 + * and return it.
 + *
 + * (We return "[scrubbed]" if SafeLogging is "1", and address otherwise.)
 + */
 +const char *
 +safe_str_client_opts(const or_options_t *options, const char *address)
 +{
 +  tor_assert(address);
 +  if (!options) {
 +    options = get_options();
 +  }
 +
 +  if (options->SafeLogging_ == SAFELOG_SCRUB_ALL)
 +    return "[scrubbed]";
 +  else
 +    return address;
 +}
 +
 +/** Make <b>address</b> -- a piece of information of unspecified sensitivity
 + * -- safe to log according to the settings in options->SafeLogging, and
 + * return it.
 + *
 + * (We return "[scrubbed]" if SafeLogging is anything besides "0", and address
 + * otherwise.)
 + */
 +const char *
 +safe_str_opts(const or_options_t *options, const char *address)
 +{
 +  tor_assert(address);
 +  if (!options) {
 +    options = get_options();
 +  }
 +
 +  if (options->SafeLogging_ != SAFELOG_SCRUB_NONE)
 +    return "[scrubbed]";
 +  else
 +    return address;
 +}
 +
 +/** Equivalent to escaped(safe_str_client(address)).  See reentrancy note on
 + * escaped(): don't use this outside the main thread, or twice in the same
 + * log statement. */
 +const char *
 +escaped_safe_str_client(const char *address)
 +{
 +  if (get_options()->SafeLogging_ == SAFELOG_SCRUB_ALL)
 +    return "[scrubbed]";
 +  else
 +    return escaped(address);
 +}
 +
 +/** Equivalent to escaped(safe_str(address)).  See reentrancy note on
 + * escaped(): don't use this outside the main thread, or twice in the same
 + * log statement. */
 +const char *
 +escaped_safe_str(const char *address)
 +{
 +  if (get_options()->SafeLogging_ != SAFELOG_SCRUB_NONE)
 +    return "[scrubbed]";
 +  else
 +    return escaped(address);
 +}
 +
 +/**
 + * The severity level that should be used for warnings of severity
 + * LOG_PROTOCOL_WARN.
 + *
 + * We keep this outside the options, and we use an atomic_counter_t, in case
 + * one thread needs to use LOG_PROTOCOL_WARN while an option transition is
 + * happening in the main thread.
 + */
 +static atomic_counter_t protocol_warning_severity_level;
 +
 +/** Return the severity level that should be used for warnings of severity
 + * LOG_PROTOCOL_WARN. */
 +int
 +get_protocol_warning_severity_level(void)
 +{
 +  return (int) atomic_counter_get(&protocol_warning_severity_level);
 +}
 +
 +/** Set the protocol warning severity level to <b>severity</b>. */
 +static void
 +set_protocol_warning_severity_level(int warning_severity)
 +{
 +  atomic_counter_exchange(&protocol_warning_severity_level,
 +                          warning_severity);
 +}
 +
 +/**
 + * Initialize the log warning severity level for protocol warnings. Call
 + * only once at startup.
 + */
 +void
 +init_protocol_warning_severity_level(void)
 +{
 +  atomic_counter_init(&protocol_warning_severity_level);
 +  set_protocol_warning_severity_level(LOG_WARN);
 +}
 +
 +/**
 + * Tear down protocol_warning_severity_level.
 + */
 +static void
 +cleanup_protocol_warning_severity_level(void)
 +{
 +   atomic_counter_destroy(&protocol_warning_severity_level);
 +}
 +
 +/** List of default directory authorities */
 +
 +static const char *default_authorities[] = {
 +#include "auth_dirs.inc"
 +  NULL
 +};
 +
 +/** List of fallback directory authorities. The list is generated by opt-in of
 + * relays that meet certain stability criteria.
 + */
 +static const char *default_fallbacks[] = {
 +#include "fallback_dirs.inc"
 +  NULL
 +};
 +
 +/** Add the default directory authorities directly into the trusted dir list,
 + * but only add them insofar as they share bits with <b>type</b>.
 + * Each authority's bits are restricted to the bits shared with <b>type</b>.
 + * If <b>type</b> is ALL_DIRINFO or NO_DIRINFO (zero), add all authorities. */
 +STATIC void
 +add_default_trusted_dir_authorities(dirinfo_type_t type)
 +{
 +  int i;
 +  for (i=0; default_authorities[i]; i++) {
 +    if (parse_dir_authority_line(default_authorities[i], type, 0)<0) {
 +      log_err(LD_BUG, "Couldn't parse internal DirAuthority line %s",
 +              default_authorities[i]);
 +    }
 +  }
 +}
 +
 +/** Add the default fallback directory servers into the fallback directory
 + * server list. */
 +MOCK_IMPL(void,
 +add_default_fallback_dir_servers,(void))
 +{
 +  int i;
 +  for (i=0; default_fallbacks[i]; i++) {
 +    if (parse_dir_fallback_line(default_fallbacks[i], 0)<0) {
 +      log_err(LD_BUG, "Couldn't parse internal FallbackDir line %s",
 +              default_fallbacks[i]);
 +    }
 +  }
 +}
 +
 +/** Look at all the config options for using alternate directory
 + * authorities, and make sure none of them are broken. Also, warn the
 + * user if we changed any dangerous ones.
 + */
 +static int
 +validate_dir_servers(or_options_t *options, or_options_t *old_options)
 +{
 +  config_line_t *cl;
 +
 +  if (options->DirAuthorities &&
 +      (options->AlternateDirAuthority || options->AlternateBridgeAuthority)) {
 +    log_warn(LD_CONFIG,
 +             "You cannot set both DirAuthority and Alternate*Authority.");
 +    return -1;
 +  }
 +
 +  /* do we want to complain to the user about being partitionable? */
 +  if ((options->DirAuthorities &&
 +       (!old_options ||
 +        !config_lines_eq(options->DirAuthorities,
 +                         old_options->DirAuthorities))) ||
 +      (options->AlternateDirAuthority &&
 +       (!old_options ||
 +        !config_lines_eq(options->AlternateDirAuthority,
 +                         old_options->AlternateDirAuthority)))) {
 +    log_warn(LD_CONFIG,
 +             "You have used DirAuthority or AlternateDirAuthority to "
 +             "specify alternate directory authorities in "
 +             "your configuration. This is potentially dangerous: it can "
 +             "make you look different from all other Tor users, and hurt "
 +             "your anonymity. Even if you've specified the same "
 +             "authorities as Tor uses by default, the defaults could "
 +             "change in the future. Be sure you know what you're doing.");
 +  }
 +
 +  /* Now go through the four ways you can configure an alternate
 +   * set of directory authorities, and make sure none are broken. */
 +  for (cl = options->DirAuthorities; cl; cl = cl->next)
 +    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 1)<0)
 +      return -1;
 +  for (cl = options->AlternateBridgeAuthority; cl; cl = cl->next)
 +    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 1)<0)
 +      return -1;
 +  for (cl = options->AlternateDirAuthority; cl; cl = cl->next)
 +    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 1)<0)
 +      return -1;
 +  for (cl = options->FallbackDir; cl; cl = cl->next)
 +    if (parse_dir_fallback_line(cl->value, 1)<0)
 +      return -1;
 +  return 0;
 +}
 +
 +/** Look at all the config options and assign new dir authorities
 + * as appropriate.
 + */
 +int
 +consider_adding_dir_servers(const or_options_t *options,
 +                            const or_options_t *old_options)
 +{
 +  config_line_t *cl;
 +  int need_to_update =
 +    !smartlist_len(router_get_trusted_dir_servers()) ||
 +    !smartlist_len(router_get_fallback_dir_servers()) || !old_options ||
 +    !config_lines_eq(options->DirAuthorities, old_options->DirAuthorities) ||
 +    !config_lines_eq(options->FallbackDir, old_options->FallbackDir) ||
 +    (options->UseDefaultFallbackDirs != old_options->UseDefaultFallbackDirs) ||
 +    !config_lines_eq(options->AlternateBridgeAuthority,
 +                     old_options->AlternateBridgeAuthority) ||
 +    !config_lines_eq(options->AlternateDirAuthority,
 +                     old_options->AlternateDirAuthority);
 +
 +  if (!need_to_update)
 +    return 0; /* all done */
 +
 +  /* "You cannot set both DirAuthority and Alternate*Authority."
 +   * Checking that this restriction holds allows us to simplify
 +   * the unit tests. */
 +  tor_assert(!(options->DirAuthorities &&
 +               (options->AlternateDirAuthority
 +                || options->AlternateBridgeAuthority)));
 +
 +  /* Start from a clean slate. */
 +  clear_dir_servers();
 +
 +  if (!options->DirAuthorities) {
 +    /* then we may want some of the defaults */
 +    dirinfo_type_t type = NO_DIRINFO;
 +    if (!options->AlternateBridgeAuthority) {
 +      type |= BRIDGE_DIRINFO;
 +    }
 +    if (!options->AlternateDirAuthority) {
 +      type |= V3_DIRINFO | EXTRAINFO_DIRINFO | MICRODESC_DIRINFO;
 +      /* Only add the default fallback directories when the DirAuthorities,
 +       * AlternateDirAuthority, and FallbackDir directory config options
 +       * are set to their defaults, and when UseDefaultFallbackDirs is 1. */
 +      if (!options->FallbackDir && options->UseDefaultFallbackDirs) {
 +        add_default_fallback_dir_servers();
 +      }
 +    }
 +    /* if type == NO_DIRINFO, we don't want to add any of the
 +     * default authorities, because we've replaced them all */
 +    if (type != NO_DIRINFO)
 +      add_default_trusted_dir_authorities(type);
 +  }
 +
 +  for (cl = options->DirAuthorities; cl; cl = cl->next)
 +    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 0)<0)
 +      return -1;
 +  for (cl = options->AlternateBridgeAuthority; cl; cl = cl->next)
 +    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 0)<0)
 +      return -1;
 +  for (cl = options->AlternateDirAuthority; cl; cl = cl->next)
 +    if (parse_dir_authority_line(cl->value, NO_DIRINFO, 0)<0)
 +      return -1;
 +  for (cl = options->FallbackDir; cl; cl = cl->next)
 +    if (parse_dir_fallback_line(cl->value, 0)<0)
 +      return -1;
 +  return 0;
 +}
 +
 +/**
 + * Make sure that <b>directory</b> exists, with appropriate ownership and
 + * permissions (as modified by <b>group_readable</b>). If <b>create</b>,
 + * create the directory if it is missing. Return 0 on success.
 + * On failure, return -1 and set *<b>msg_out</b>.
 + */
 +static int
 +check_and_create_data_directory(int create,
 +                                const char *directory,
 +                                int group_readable,
 +                                const char *owner,
 +                                char **msg_out)
 +{
 +  cpd_check_t cpd_opts = create ? CPD_CREATE : CPD_CHECK;
 +  if (group_readable)
 +      cpd_opts |= CPD_GROUP_READ;
 +  if (check_private_dir(directory,
 +                        cpd_opts,
 +                        owner) < 0) {
 +    tor_asprintf(msg_out,
 +                 "Couldn't %s private data directory \"%s\"",
 +                 create ? "create" : "access",
 +                 directory);
 +    return -1;
 +  }
 +
 +#ifndef _WIN32
 +  if (group_readable) {
 +    /* Only new dirs created get new opts, also enforce group read. */
 +    if (chmod(directory, 0750)) {
 +      log_warn(LD_FS,"Unable to make %s group-readable: %s",
 +               directory, strerror(errno));
 +    }
 +  }
 +#endif /* !defined(_WIN32) */
 +
 +  return 0;
 +}
 +
 +/**
 + * Ensure that our keys directory exists, with appropriate permissions.
 + * Return 0 on success, -1 on failure.
 + */
 +int
 +create_keys_directory(const or_options_t *options)
 +{
 +  /* Make sure DataDirectory exists, and is private. */
 +  cpd_check_t cpd_opts = CPD_CREATE;
 +  if (options->DataDirectoryGroupReadable)
 +    cpd_opts |= CPD_GROUP_READ;
 +  if (check_private_dir(options->DataDirectory, cpd_opts, options->User)) {
 +    log_err(LD_OR, "Can't create/check datadirectory %s",
 +            options->DataDirectory);
 +    return -1;
 +  }
 +
 +  /* Check the key directory. */
 +  if (check_private_dir(options->KeyDirectory, CPD_CREATE, options->User)) {
 +    return -1;
 +  }
 +  return 0;
 +}
 +
 +/* Helps determine flags to pass to switch_id. */
 +static int have_low_ports = -1;
 +
 +/** Fetch the active option list, and take actions based on it. All of the
 + * things we do should survive being done repeatedly.  If present,
 + * <b>old_options</b> contains the previous value of the options.
 + *
 + * Return 0 if all goes well, return -1 if things went badly.
 + */
 +static int
 +options_act_reversible(const or_options_t *old_options, char **msg)
 +{
 +  smartlist_t *new_listeners = smartlist_new();
 +  or_options_t *options = get_options_mutable();
 +  int running_tor = options->command == CMD_RUN_TOR;
 +  int set_conn_limit = 0;
 +  int r = -1;
 +  int logs_marked = 0, logs_initialized = 0;
 +  int old_min_log_level = get_min_log_level();
 +
 +  /* Daemonize _first_, since we only want to open most of this stuff in
 +   * the subprocess.  Libevent bases can't be reliably inherited across
 +   * processes. */
 +  if (running_tor && options->RunAsDaemon) {
 +    if (! start_daemon_has_been_called())
 +      crypto_prefork();
 +    /* No need to roll back, since you can't change the value. */
 +    if (start_daemon())
 +      crypto_postfork();
 +  }
 +
 +#ifdef HAVE_SYSTEMD
 +  /* Our PID may have changed, inform supervisor */
 +  sd_notifyf(0, "MAINPID=%ld\n", (long int)getpid());
 +#endif
 +
 +#ifndef HAVE_SYS_UN_H
 +  if (options->ControlSocket || options->ControlSocketsGroupWritable) {
 +    *msg = tor_strdup("Unix domain sockets (ControlSocket) not supported "
 +                      "on this OS/with this build.");
 +    goto rollback;
 +  }
 +#else /* !(!defined(HAVE_SYS_UN_H)) */
 +  if (options->ControlSocketsGroupWritable && !options->ControlSocket) {
 +    *msg = tor_strdup("Setting ControlSocketGroupWritable without setting"
 +                      "a ControlSocket makes no sense.");
 +    goto rollback;
 +  }
 +#endif /* !defined(HAVE_SYS_UN_H) */
 +
 +  if (running_tor) {
 +    int n_ports=0;
 +    /* We need to set the connection limit before we can open the listeners. */
 +    if (! sandbox_is_active()) {
 +      if (set_max_file_descriptors((unsigned)options->ConnLimit,
 +                                   &options->ConnLimit_) < 0) {
 +        *msg = tor_strdup("Problem with ConnLimit value. "
 +                          "See logs for details.");
 +        goto rollback;
 +      }
 +      set_conn_limit = 1;
 +    } else {
 +      tor_assert(old_options);
 +      options->ConnLimit_ = old_options->ConnLimit_;
 +    }
 +
 +    /* Set up libevent.  (We need to do this before we can register the
 +     * listeners as listeners.) */
 +    if (running_tor && !libevent_initialized) {
 +      init_libevent(options);
 +      libevent_initialized = 1;
 +
 +      /* This has to come up after libevent is initialized. */
 +      control_initialize_event_queue();
 +
 +      /*
 +       * Initialize the scheduler - this has to come after
 +       * options_init_from_torrc() sets up libevent - why yes, that seems
 +       * completely sensible to hide the libevent setup in the option parsing
 +       * code!  It also needs to happen before init_keys(), so it needs to
 +       * happen here too.  How yucky. */
 +      scheduler_init();
 +    }
 +
 +    /* Adjust the port configuration so we can launch listeners. */
 +    if (parse_ports(options, 0, msg, &n_ports, NULL)) {
 +      if (!*msg)
 +        *msg = tor_strdup("Unexpected problem parsing port config");
 +      goto rollback;
 +    }
 +
 +    /* Set the hibernation state appropriately.*/
 +    consider_hibernation(time(NULL));
 +
 +    /* Launch the listeners.  (We do this before we setuid, so we can bind to
 +     * ports under 1024.)  We don't want to rebind if we're hibernating or
 +     * shutting down. If networking is disabled, this will close all but the
 +     * control listeners, but disable those. */
 +    if (!we_are_hibernating()) {
 +      if (retry_all_listeners(new_listeners, options->DisableNetwork) < 0) {
 +        *msg = tor_strdup("Failed to bind one of the listener ports.");
 +        goto rollback;
 +      }
 +    }
 +    if (options->DisableNetwork) {
 +      /* Aggressively close non-controller stuff, NOW */
 +      log_notice(LD_NET, "DisableNetwork is set. Tor will not make or accept "
 +                 "non-control network connections. Shutting down all existing "
 +                 "connections.");
 +      connection_mark_all_noncontrol_connections();
 +      /* We can't complete circuits until the network is re-enabled. */
 +      note_that_we_maybe_cant_complete_circuits();
 +    }
 +  }
 +
 +#if defined(HAVE_NET_IF_H) && defined(HAVE_NET_PFVAR_H)
 +  /* Open /dev/pf before dropping privileges. */
 +  if (options->TransPort_set &&
 +      options->TransProxyType_parsed == TPT_DEFAULT) {
 +    if (get_pf_socket() < 0) {
 +      *msg = tor_strdup("Unable to open /dev/pf for transparent proxy.");
 +      goto rollback;
 +    }
 +  }
 +#endif /* defined(HAVE_NET_IF_H) && defined(HAVE_NET_PFVAR_H) */
 +
 +  /* Attempt to lock all current and future memory with mlockall() only once */
 +  if (options->DisableAllSwap) {
 +    if (tor_mlockall() == -1) {
 +      *msg = tor_strdup("DisableAllSwap failure. Do you have proper "
 +                        "permissions?");
 +      goto done;
 +    }
 +  }
 +
 +  /* Setuid/setgid as appropriate */
 +  if (options->User) {
 +    tor_assert(have_low_ports != -1);
 +    unsigned switch_id_flags = 0;
 +    if (options->KeepBindCapabilities == 1) {
 +      switch_id_flags |= SWITCH_ID_KEEP_BINDLOW;
 +      switch_id_flags |= SWITCH_ID_WARN_IF_NO_CAPS;
 +    }
 +    if (options->KeepBindCapabilities == -1 && have_low_ports) {
 +      switch_id_flags |= SWITCH_ID_KEEP_BINDLOW;
 +    }
 +    if (switch_id(options->User, switch_id_flags) != 0) {
 +      /* No need to roll back, since you can't change the value. */
 +      *msg = tor_strdup("Problem with User value. See logs for details.");
 +      goto done;
 +    }
 +  }
 +
 +  /* Ensure data directory is private; create if possible. */
 +  /* It's okay to do this in "options_act_reversible()" even though it isn't
 +   * actually reversible, since you can't change the DataDirectory while
 +   * Tor is running. */
 +  if (check_and_create_data_directory(running_tor /* create */,
 +                                      options->DataDirectory,
 +                                      options->DataDirectoryGroupReadable,
 +                                      options->User,
 +                                      msg) < 0) {
 +    goto done;
 +  }
 +  if (check_and_create_data_directory(running_tor /* create */,
 +                                      options->KeyDirectory,
 +                                      options->KeyDirectoryGroupReadable,
 +                                      options->User,
 +                                      msg) < 0) {
 +    goto done;
 +  }
 +
 +  /* We need to handle the group-readable flag for the cache directory
 +   * specially, since the directory defaults to being the same as the
 +   * DataDirectory. */
 +  int cache_dir_group_readable;
 +  if (options->CacheDirectoryGroupReadable != -1) {
 +    /* If the user specified a value, use their setting */
 +    cache_dir_group_readable = options->CacheDirectoryGroupReadable;
 +  } else if (!strcmp(options->CacheDirectory, options->DataDirectory)) {
 +    /* If the user left the value as "auto", and the cache is the same as the
 +     * datadirectory, use the datadirectory setting.
 +     */
 +    cache_dir_group_readable = options->DataDirectoryGroupReadable;
 +  } else {
 +    /* Otherwise, "auto" means "not group readable". */
 +    cache_dir_group_readable = 0;
 +  }
 +  if (check_and_create_data_directory(running_tor /* create */,
 +                                      options->CacheDirectory,
 +                                      cache_dir_group_readable,
 +                                      options->User,
 +                                      msg) < 0) {
 +    goto done;
 +  }
 +
 +  /* Bail out at this point if we're not going to be a client or server:
 +   * we don't run Tor itself. */
 +  if (!running_tor)
 +    goto commit;
 +
 +  mark_logs_temp(); /* Close current logs once new logs are open. */
 +  logs_marked = 1;
 +  /* Configure the tor_log(s) */
 +  if (options_init_logs(old_options, options, 0)<0) {
 +    *msg = tor_strdup("Failed to init Log options. See logs for details.");
 +    goto rollback;
 +  }
 +  logs_initialized = 1;
 +
 + commit:
 +  r = 0;
 +  if (logs_marked) {
 +    log_severity_list_t *severity =
 +      tor_malloc_zero(sizeof(log_severity_list_t));
 +    close_temp_logs();
 +    add_callback_log(severity, control_event_logmsg);
 +    logs_set_pending_callback_callback(control_event_logmsg_pending);
 +    control_adjust_event_log_severity();
 +    tor_free(severity);
 +    tor_log_update_sigsafe_err_fds();
 +  }
 +  if (logs_initialized) {
 +    flush_log_messages_from_startup();
 +  }
 +
 +  {
 +    const char *badness = NULL;
 +    int bad_safelog = 0, bad_severity = 0, new_badness = 0;
 +    if (options->SafeLogging_ != SAFELOG_SCRUB_ALL) {
 +      bad_safelog = 1;
 +      if (!old_options || old_options->SafeLogging_ != options->SafeLogging_)
 +        new_badness = 1;
 +    }
 +    if (get_min_log_level() >= LOG_INFO) {
 +      bad_severity = 1;
 +      if (get_min_log_level() != old_min_log_level)
 +        new_badness = 1;
 +    }
 +    if (bad_safelog && bad_severity)
 +      badness = "you disabled SafeLogging, and "
 +        "you're logging more than \"notice\"";
 +    else if (bad_safelog)
 +      badness = "you disabled SafeLogging";
 +    else
 +      badness = "you're logging more than \"notice\"";
 +    if (new_badness)
 +      log_warn(LD_GENERAL, "Your log may contain sensitive information - %s. "
 +               "Don't log unless it serves an important reason. "
 +               "Overwrite the log afterwards.", badness);
 +  }
 +
 +  if (set_conn_limit) {
 +    /*
 +     * If we adjusted the conn limit, recompute the OOS threshold too
 +     *
 +     * How many possible sockets to keep in reserve?  If we have lots of
 +     * possible sockets, keep this below a limit and set ConnLimit_high_thresh
 +     * very close to ConnLimit_, but if ConnLimit_ is low, shrink it in
 +     * proportion.
 +     *
 +     * Somewhat arbitrarily, set socks_in_reserve to 5% of ConnLimit_, but
 +     * cap it at 64.
 +     */
 +    int socks_in_reserve = options->ConnLimit_ / 20;
 +    if (socks_in_reserve > 64) socks_in_reserve = 64;
 +
 +    options->ConnLimit_high_thresh = options->ConnLimit_ - socks_in_reserve;
 +    options->ConnLimit_low_thresh = (options->ConnLimit_ / 4) * 3;
 +    log_info(LD_GENERAL,
 +             "Recomputed OOS thresholds: ConnLimit %d, ConnLimit_ %d, "
 +             "ConnLimit_high_thresh %d, ConnLimit_low_thresh %d",
 +             options->ConnLimit, options->ConnLimit_,
 +             options->ConnLimit_high_thresh,
 +             options->ConnLimit_low_thresh);
 +
 +    /* Give the OOS handler a chance with the new thresholds */
 +    connection_check_oos(get_n_open_sockets(), 0);
 +  }
 +
 +  goto done;
 +
 + rollback:
 +  r = -1;
 +  tor_assert(*msg);
 +
 +  if (logs_marked) {
 +    rollback_log_changes();
 +    control_adjust_event_log_severity();
 +  }
 +
 +  if (set_conn_limit && old_options)
 +    set_max_file_descriptors((unsigned)old_options->ConnLimit,
 +                             &options->ConnLimit_);
 +
 +  SMARTLIST_FOREACH(new_listeners, connection_t *, conn,
 +  {
 +    log_notice(LD_NET, "Closing partially-constructed %s on %s:%d",
 +               conn_type_to_string(conn->type), conn->address, conn->port);
 +    connection_close_immediate(conn);
 +    connection_mark_for_close(conn);
 +  });
 +
 + done:
 +  smartlist_free(new_listeners);
 +  return r;
 +}
 +
 +/** If we need to have a GEOIP ip-to-country map to run with our configured
 + * options, return 1 and set *<b>reason_out</b> to a description of why. */
 +int
 +options_need_geoip_info(const or_options_t *options, const char **reason_out)
 +{
 +  int bridge_usage = should_record_bridge_info(options);
 +  int routerset_usage =
 +    routerset_needs_geoip(options->EntryNodes) ||
 +    routerset_needs_geoip(options->ExitNodes) ||
 +    routerset_needs_geoip(options->ExcludeExitNodes) ||
 +    routerset_needs_geoip(options->ExcludeNodes) ||
 +    routerset_needs_geoip(options->HSLayer2Nodes) ||
 +    routerset_needs_geoip(options->HSLayer3Nodes);
 +
 +  if (routerset_usage && reason_out) {
 +    *reason_out = "We've been configured to use (or avoid) nodes in certain "
 +      "countries, and we need GEOIP information to figure out which ones they "
 +      "are.";
 +  } else if (bridge_usage && reason_out) {
 +    *reason_out = "We've been configured to see which countries can access "
 +      "us as a bridge, and we need GEOIP information to tell which countries "
 +      "clients are in.";
 +  }
 +  return bridge_usage || routerset_usage;
 +}
 +
 +/** Return the bandwidthrate that we are going to report to the authorities
 + * based on the config options. */
 +uint32_t
 +get_effective_bwrate(const or_options_t *options)
 +{
 +  uint64_t bw = options->BandwidthRate;
 +  if (bw > options->MaxAdvertisedBandwidth)
 +    bw = options->MaxAdvertisedBandwidth;
 +  if (options->RelayBandwidthRate > 0 && bw > options->RelayBandwidthRate)
 +    bw = options->RelayBandwidthRate;
 +  /* ensure_bandwidth_cap() makes sure that this cast can't overflow. */
 +  return (uint32_t)bw;
 +}
 +
 +/** Return the bandwidthburst that we are going to report to the authorities
 + * based on the config options. */
 +uint32_t
 +get_effective_bwburst(const or_options_t *options)
 +{
 +  uint64_t bw = options->BandwidthBurst;
 +  if (options->RelayBandwidthBurst > 0 && bw > options->RelayBandwidthBurst)
 +    bw = options->RelayBandwidthBurst;
 +  /* ensure_bandwidth_cap() makes sure that this cast can't overflow. */
 +  return (uint32_t)bw;
 +}
 +
 +/* Used in the various options_transition_affects* functions. */
 +#define YES_IF_CHANGED_BOOL(opt) \
 +  if (!CFG_EQ_BOOL(old_options, new_options, opt)) return 1;
 +#define YES_IF_CHANGED_INT(opt) \
 +  if (!CFG_EQ_INT(old_options, new_options, opt)) return 1;
 +#define YES_IF_CHANGED_STRING(opt) \
 +  if (!CFG_EQ_STRING(old_options, new_options, opt)) return 1;
 +#define YES_IF_CHANGED_LINELIST(opt) \
 +  if (!CFG_EQ_LINELIST(old_options, new_options, opt)) return 1;
 +#define YES_IF_CHANGED_SMARTLIST(opt) \
 +  if (!CFG_EQ_SMARTLIST(old_options, new_options, opt)) return 1;
 +#define YES_IF_CHANGED_ROUTERSET(opt) \
 +  if (!CFG_EQ_ROUTERSET(old_options, new_options, opt)) return 1;
 +
 +/**
 + * Return true if changing the configuration from <b>old</b> to <b>new</b>
 + * affects the guard subsystem.
 + */
 +static int
 +options_transition_affects_guards(const or_options_t *old_options,
 +                                  const or_options_t *new_options)
 +{
 +  /* NOTE: Make sure this function stays in sync with
 +   * node_passes_guard_filter */
 +  tor_assert(old_options);
 +  tor_assert(new_options);
 +
 +  YES_IF_CHANGED_BOOL(UseEntryGuards);
 +  YES_IF_CHANGED_BOOL(UseBridges);
 +  YES_IF_CHANGED_BOOL(ClientUseIPv4);
 +  YES_IF_CHANGED_BOOL(ClientUseIPv6);
 +  YES_IF_CHANGED_BOOL(FascistFirewall);
 +  YES_IF_CHANGED_ROUTERSET(ExcludeNodes);
 +  YES_IF_CHANGED_ROUTERSET(EntryNodes);
 +  YES_IF_CHANGED_SMARTLIST(FirewallPorts);
 +  YES_IF_CHANGED_LINELIST(Bridges);
 +  YES_IF_CHANGED_LINELIST(ReachableORAddresses);
 +  YES_IF_CHANGED_LINELIST(ReachableDirAddresses);
 +
 +  return 0;
 +}
 +
 +/**
 + * Return true if changing the configuration from <b>old</b> to <b>new</b>
 + * affects the timing of the voting subsystem
 + */
 +static int
 +options_transition_affects_dirauth_timing(const or_options_t *old_options,
 +                                          const or_options_t *new_options)
 +{
 +  tor_assert(old_options);
 +  tor_assert(new_options);
 +
 +  if (authdir_mode_v3(old_options) != authdir_mode_v3(new_options))
 +    return 1;
 +  if (! authdir_mode_v3(new_options))
 +    return 0;
 +  YES_IF_CHANGED_INT(V3AuthVotingInterval);
 +  YES_IF_CHANGED_INT(V3AuthVoteDelay);
 +  YES_IF_CHANGED_INT(V3AuthDistDelay);
 +  YES_IF_CHANGED_INT(TestingV3AuthInitialVotingInterval);
 +  YES_IF_CHANGED_INT(TestingV3AuthInitialVoteDelay);
 +  YES_IF_CHANGED_INT(TestingV3AuthInitialDistDelay);
 +  YES_IF_CHANGED_INT(TestingV3AuthVotingStartOffset);
 +
 +  return 0;
 +}
 +
 +/** Fetch the active option list, and take actions based on it. All of the
 + * things we do should survive being done repeatedly.  If present,
 + * <b>old_options</b> contains the previous value of the options.
 + *
 + * Return 0 if all goes well, return -1 if it's time to die.
 + *
 + * Note: We haven't moved all the "act on new configuration" logic
 + * here yet.  Some is still in do_hup() and other places.
 + */
 +STATIC int
 +options_act(const or_options_t *old_options)
 +{
 +  config_line_t *cl;
 +  or_options_t *options = get_options_mutable();
 +  int running_tor = options->command == CMD_RUN_TOR;
 +  char *msg=NULL;
 +  const int transition_affects_workers =
 +    old_options && options_transition_affects_workers(old_options, options);
 +  const int transition_affects_guards =
 +    old_options && options_transition_affects_guards(old_options, options);
 +
 +  if (options->NoExec || options->Sandbox) {
 +    tor_disable_spawning_background_processes();
 +  }
 +
 +  /* disable ptrace and later, other basic debugging techniques */
 +  {
 +    /* Remember if we already disabled debugger attachment */
 +    static int disabled_debugger_attach = 0;
 +    /* Remember if we already warned about being configured not to disable
 +     * debugger attachment */
 +    static int warned_debugger_attach = 0;
 +    /* Don't disable debugger attachment when we're running the unit tests. */
 +    if (options->DisableDebuggerAttachment && !disabled_debugger_attach &&
 +        running_tor) {
 +      int ok = tor_disable_debugger_attach();
 +      /* LCOV_EXCL_START the warned_debugger_attach is 0 can't reach inside. */
 +      if (warned_debugger_attach && ok == 1) {
 +        log_notice(LD_CONFIG, "Disabled attaching debuggers for unprivileged "
 +                   "users.");
 +      }
 +      /* LCOV_EXCL_STOP */
 +      disabled_debugger_attach = (ok == 1);
 +    } else if (!options->DisableDebuggerAttachment &&
 +               !warned_debugger_attach) {
 +      log_notice(LD_CONFIG, "Not disabling debugger attaching for "
 +                 "unprivileged users.");
 +      warned_debugger_attach = 1;
 +    }
 +  }
 +
 +  /* Write control ports to disk as appropriate */
 +  control_ports_write_to_file();
 +
 +  if (running_tor && !have_lockfile()) {
 +    if (try_locking(options, 1) < 0)
 +      return -1;
 +  }
 +
 +  {
 +    int warning_severity = options->ProtocolWarnings ? LOG_WARN : LOG_INFO;
 +    set_protocol_warning_severity_level(warning_severity);
 +  }
 +
 +  if (consider_adding_dir_servers(options, old_options) < 0) {
 +    // XXXX This should get validated earlier, and committed here, to
 +    // XXXX lower opportunities for reaching an error case.
 +    return -1;
 +  }
 +
 +  if (rend_non_anonymous_mode_enabled(options)) {
 +    log_warn(LD_GENERAL, "This copy of Tor was compiled or configured to run "
 +             "in a non-anonymous mode. It will provide NO ANONYMITY.");
 +  }
 +
 +  /* If we are a bridge with a pluggable transport proxy but no
 +     Extended ORPort, inform the user that they are missing out. */
 +  if (server_mode(options) && options->ServerTransportPlugin &&
 +      !options->ExtORPort_lines) {
 +    log_notice(LD_CONFIG, "We use pluggable transports but the Extended "
 +               "ORPort is disabled. Tor and your pluggable transports proxy "
 +               "communicate with each other via the Extended ORPort so it "
 +               "is suggested you enable it: it will also allow your Bridge "
 +               "to collect statistics about its clients that use pluggable "
 +               "transports. Please enable it using the ExtORPort torrc option "
 +               "(e.g. set 'ExtORPort auto').");
 +  }
 +
 +  if (options->Bridges) {
 +    mark_bridge_list();
 +    for (cl = options->Bridges; cl; cl = cl->next) {
 +      bridge_line_t *bridge_line = parse_bridge_line(cl->value);
 +      if (!bridge_line) {
 +        // LCOV_EXCL_START
 +        log_warn(LD_BUG,
 +                 "Previously validated Bridge line could not be added!");
 +        return -1;
 +        // LCOV_EXCL_STOP
 +      }
 +      bridge_add_from_config(bridge_line);
 +    }
 +    sweep_bridge_list();
 +  }
 +
 +  if (running_tor && hs_config_service_all(options, 0)<0) {
 +    // LCOV_EXCL_START
 +    log_warn(LD_BUG,
 +       "Previously validated hidden services line could not be added!");
 +    return -1;
 +    // LCOV_EXCL_STOP
 +  }
 +
 +  if (running_tor && hs_config_client_auth_all(options, 0) < 0) {
 +    // LCOV_EXCL_START
 +    log_warn(LD_BUG, "Previously validated client authorization for "
 +                     "hidden services could not be added!");
 +    return -1;
 +    // LCOV_EXCL_STOP
 +  }
 +
 +  if (running_tor && !old_options &&
 +      options->OwningControllerFD != UINT64_MAX) {
 +    const unsigned ctrl_flags =
 +      CC_LOCAL_FD_IS_OWNER |
 +      CC_LOCAL_FD_IS_AUTHENTICATED;
 +    tor_socket_t ctrl_sock = (tor_socket_t)options->OwningControllerFD;
 +    if (control_connection_add_local_fd(ctrl_sock, ctrl_flags) < 0) {
 +      log_warn(LD_CONFIG, "Could not add local controller connection with "
 +               "given FD.");
 +      return -1;
 +    }
 +  }
 +
 +  /* Load state */
 +  if (! or_state_loaded() && running_tor) {
 +    if (or_state_load())
 +      return -1;
 +    rep_hist_load_mtbf_data(time(NULL));
 +  }
 +
 +  /* If we have an ExtORPort, initialize its auth cookie. */
 +  if (running_tor &&
 +      init_ext_or_cookie_authentication(!!options->ExtORPort_lines) < 0) {
 +    log_warn(LD_CONFIG,"Error creating Extended ORPort cookie file.");
 +    return -1;
 +  }
 +
 +  mark_transport_list();
 +  pt_prepare_proxy_list_for_config_read();
 +  if (!options->DisableNetwork) {
 +    if (options->ClientTransportPlugin) {
 +      for (cl = options->ClientTransportPlugin; cl; cl = cl->next) {
 +        if (parse_transport_line(options, cl->value, 0, 0) < 0) {
 +          // LCOV_EXCL_START
 +          log_warn(LD_BUG,
 +                   "Previously validated ClientTransportPlugin line "
 +                   "could not be added!");
 +          return -1;
 +          // LCOV_EXCL_STOP
 +        }
 +      }
 +    }
 +
 +    if (options->ServerTransportPlugin && server_mode(options)) {
 +      for (cl = options->ServerTransportPlugin; cl; cl = cl->next) {
 +        if (parse_transport_line(options, cl->value, 0, 1) < 0) {
 +          // LCOV_EXCL_START
 +          log_warn(LD_BUG,
 +                   "Previously validated ServerTransportPlugin line "
 +                   "could not be added!");
 +          return -1;
 +          // LCOV_EXCL_STOP
 +        }
 +      }
 +    }
 +  }
 +  sweep_transport_list();
 +  sweep_proxy_list();
 +
 +  /* Start the PT proxy configuration. By doing this configuration
 +     here, we also figure out which proxies need to be restarted and
 +     which not. */
 +  if (pt_proxies_configuration_pending() && !net_is_disabled())
 +    pt_configure_remaining_proxies();
 +
 +  /* Bail out at this point if we're not going to be a client or server:
 +   * we want to not fork, and to log stuff to stderr. */
 +  if (!running_tor)
 +    return 0;
 +
 +  /* Finish backgrounding the process */
 +  if (options->RunAsDaemon) {
 +    /* We may be calling this for the n'th time (on SIGHUP), but it's safe. */
 +    finish_daemon(options->DataDirectory);
 +  }
 +
 +  /* See whether we need to enable/disable our once-a-second timer. */
 +  reschedule_per_second_timer();
 +
 +  /* We want to reinit keys as needed before we do much of anything else:
 +     keys are important, and other things can depend on them. */
 +  if (transition_affects_workers ||
 +      (options->V3AuthoritativeDir && (!old_options ||
 +                                       !old_options->V3AuthoritativeDir))) {
 +    if (init_keys() < 0) {
 +      log_warn(LD_BUG,"Error initializing keys; exiting");
 +      return -1;
 +    }
 +  }
 +
 +  /* Write our PID to the PID file. If we do not have write permissions we
 +   * will log a warning and exit. */
 +  if (options->PidFile && !sandbox_is_active()) {
 +    if (write_pidfile(options->PidFile) < 0) {
 +      log_err(LD_CONFIG, "Unable to write PIDFile %s",
 +              escaped(options->PidFile));
 +      return -1;
 +    }
 +  }
 +
 +  /* Register addressmap directives */
 +  config_register_addressmaps(options);
 +  parse_virtual_addr_network(options->VirtualAddrNetworkIPv4, AF_INET,0,NULL);
 +  parse_virtual_addr_network(options->VirtualAddrNetworkIPv6, AF_INET6,0,NULL);
 +
 +  /* Update address policies. */
 +  if (policies_parse_from_options(options) < 0) {
 +    /* This should be impossible, but let's be sure. */
 +    log_warn(LD_BUG,"Error parsing already-validated policy options.");
 +    return -1;
 +  }
 +
 +  if (server_mode(options)) {
 +    static int cdm_initialized = 0;
 +    if (cdm_initialized == 0) {
 +      cdm_initialized = 1;
 +      consdiffmgr_configure(NULL);
 +      consdiffmgr_validate();
 +    }
 +  }
 +
 +  if (init_control_cookie_authentication(options->CookieAuthentication) < 0) {
 +    log_warn(LD_CONFIG,"Error creating control cookie authentication file.");
 +    return -1;
 +  }
 +
 +  monitor_owning_controller_process(options->OwningControllerProcess);
 +
 +  /* reload keys as needed for rendezvous services. */
 +  if (hs_service_load_all_keys() < 0) {
 +    log_warn(LD_GENERAL,"Error loading rendezvous service keys");
 +    return -1;
 +  }
 +
 +  /* Inform the scheduler subsystem that a configuration changed happened. It
 +   * might be a change of scheduler or parameter. */
 +  scheduler_conf_changed();
 +
 +  /* Set up accounting */
 +  if (accounting_parse_options(options, 0)<0) {
 +    // LCOV_EXCL_START
 +    log_warn(LD_BUG,"Error in previously validated accounting options");
 +    return -1;
 +    // LCOV_EXCL_STOP
 +  }
 +  if (accounting_is_enabled(options))
 +    configure_accounting(time(NULL));
 +
 +  /* Change the cell EWMA settings */
 +  cmux_ewma_set_options(options, networkstatus_get_latest_consensus());
 +
 +  /* Update the BridgePassword's hashed version as needed.  We store this as a
 +   * digest so that we can do side-channel-proof comparisons on it.
 +   */
 +  if (options->BridgePassword) {
 +    char *http_authenticator;
 +    http_authenticator = alloc_http_authenticator(options->BridgePassword);
 +    if (!http_authenticator) {
 +      // XXXX This should get validated in options_validate().
 +      log_warn(LD_BUG, "Unable to allocate HTTP authenticator. Not setting "
 +               "BridgePassword.");
 +      return -1;
 +    }
 +    options->BridgePassword_AuthDigest_ = tor_malloc(DIGEST256_LEN);
 +    crypto_digest256(options->BridgePassword_AuthDigest_,
 +                     http_authenticator, strlen(http_authenticator),
 +                     DIGEST_SHA256);
 +    tor_free(http_authenticator);
 +  }
 +
 +  if (parse_outbound_addresses(options, 0, &msg) < 0) {
 +    // LCOV_EXCL_START
 +    log_warn(LD_BUG, "Failed parsing previously validated outbound "
 +             "bind addresses: %s", msg);
 +    tor_free(msg);
 +    return -1;
 +    // LCOV_EXCL_STOP
 +  }
 +
 +  config_maybe_load_geoip_files_(options, old_options);
 +
 +  if (geoip_is_loaded(AF_INET) && options->GeoIPExcludeUnknown) {
 +    /* ExcludeUnknown is true or "auto" */
 +    const int is_auto = options->GeoIPExcludeUnknown == -1;
 +    int changed;
 +
 +    changed  = routerset_add_unknown_ccs(&options->ExcludeNodes, is_auto);
 +    changed += routerset_add_unknown_ccs(&options->ExcludeExitNodes, is_auto);
 +
 +    if (changed)
 +      routerset_add_unknown_ccs(&options->ExcludeExitNodesUnion_, is_auto);
 +  }
 +
 +  /* Check for transitions that need action. */
 +  if (old_options) {
 +    int revise_trackexithosts = 0;
 +    int revise_automap_entries = 0;
 +    int abandon_circuits = 0;
 +    if ((options->UseEntryGuards && !old_options->UseEntryGuards) ||
 +        options->UseBridges != old_options->UseBridges ||
 +        (options->UseBridges &&
 +         !config_lines_eq(options->Bridges, old_options->Bridges)) ||
 +        !routerset_equal(old_options->ExcludeNodes,options->ExcludeNodes) ||
 +        !routerset_equal(old_options->ExcludeExitNodes,
 +                         options->ExcludeExitNodes) ||
 +        !routerset_equal(old_options->EntryNodes, options->EntryNodes) ||
 +        !routerset_equal(old_options->ExitNodes, options->ExitNodes) ||
 +        !routerset_equal(old_options->HSLayer2Nodes,
 +                         options->HSLayer2Nodes) ||
 +        !routerset_equal(old_options->HSLayer3Nodes,
 +                         options->HSLayer3Nodes) ||
 +        options->StrictNodes != old_options->StrictNodes) {
 +      log_info(LD_CIRC,
 +               "Changed to using entry guards or bridges, or changed "
 +               "preferred or excluded node lists. "
 +               "Abandoning previous circuits.");
 +      abandon_circuits = 1;
 +    }
 +
 +    if (transition_affects_guards) {
 +      if (guards_update_all()) {
 +        abandon_circuits = 1;
 +      }
 +    }
 +
 +    if (abandon_circuits) {
 +      circuit_mark_all_unused_circs();
 +      circuit_mark_all_dirty_circs_as_unusable();
 +      revise_trackexithosts = 1;
 +    }
 +
 +    if (!smartlist_strings_eq(old_options->TrackHostExits,
 +                              options->TrackHostExits))
 +      revise_trackexithosts = 1;
 +
 +    if (revise_trackexithosts)
 +      addressmap_clear_excluded_trackexithosts(options);
 +
 +    if (!options->AutomapHostsOnResolve &&
 +        old_options->AutomapHostsOnResolve) {
 +        revise_automap_entries = 1;
 +    } else {
 +      if (!smartlist_strings_eq(old_options->AutomapHostsSuffixes,
 +                                options->AutomapHostsSuffixes))
 +        revise_automap_entries = 1;
 +      else if (!opt_streq(old_options->VirtualAddrNetworkIPv4,
 +                          options->VirtualAddrNetworkIPv4) ||
 +               !opt_streq(old_options->VirtualAddrNetworkIPv6,
 +                          options->VirtualAddrNetworkIPv6))
 +        revise_automap_entries = 1;
 +    }
 +
 +    if (revise_automap_entries)
 +      addressmap_clear_invalid_automaps(options);
 +
 +/* How long should we delay counting bridge stats after becoming a bridge?
 + * We use this so we don't count clients who used our bridge thinking it is
 + * a relay. If you change this, don't forget to change the log message
 + * below. It's 4 hours (the time it takes to stop being used by clients)
 + * plus some extra time for clock skew. */
 +#define RELAY_BRIDGE_STATS_DELAY (6 * 60 * 60)
 +
 +    if (! bool_eq(options->BridgeRelay, old_options->BridgeRelay)) {
 +      int was_relay = 0;
 +      if (options->BridgeRelay) {
 +        time_t int_start = time(NULL);
 +        if (config_lines_eq(old_options->ORPort_lines,options->ORPort_lines)) {
 +          int_start += RELAY_BRIDGE_STATS_DELAY;
 +          was_relay = 1;
 +        }
 +        geoip_bridge_stats_init(int_start);
 +        log_info(LD_CONFIG, "We are acting as a bridge now.  Starting new "
 +                 "GeoIP stats interval%s.", was_relay ? " in 6 "
 +                 "hours from now" : "");
 +      } else {
 +        geoip_bridge_stats_term();
 +        log_info(LD_GENERAL, "We are no longer acting as a bridge.  "
 +                 "Forgetting GeoIP stats.");
 +      }
 +    }
 +
 +    if (transition_affects_workers) {
 +      log_info(LD_GENERAL,
 +               "Worker-related options changed. Rotating workers.");
 +      const int server_mode_turned_on =
 +        server_mode(options) && !server_mode(old_options);
 +      const int dir_server_mode_turned_on =
 +        dir_server_mode(options) && !dir_server_mode(old_options);
 +
 +      if (server_mode_turned_on || dir_server_mode_turned_on) {
 +        cpu_init();
 +      }
 +
 +      if (server_mode_turned_on) {
 +        ip_address_changed(0);
 +        if (have_completed_a_circuit() || !any_predicted_circuits(time(NULL)))
 +          inform_testing_reachability();
 +      }
 +      cpuworkers_rotate_keyinfo();
 +      if (dns_reset())
 +        return -1;
 +    } else {
 +      if (dns_reset())
 +        return -1;
 +    }
 +
 +    if (options->PerConnBWRate != old_options->PerConnBWRate ||
 +        options->PerConnBWBurst != old_options->PerConnBWBurst)
 +      connection_or_update_token_buckets(get_connection_array(), options);
 +
 +    if (options->BandwidthRate != old_options->BandwidthRate ||
 +        options->BandwidthBurst != old_options->BandwidthBurst ||
 +        options->RelayBandwidthRate != old_options->RelayBandwidthRate ||
 +        options->RelayBandwidthBurst != old_options->RelayBandwidthBurst)
 +      connection_bucket_adjust(options);
 +
 +    if (options->MainloopStats != old_options->MainloopStats) {
 +      reset_main_loop_counters();
 +    }
 +  }
 +
 +  /* Only collect directory-request statistics on relays and bridges. */
 +  options->DirReqStatistics = options->DirReqStatistics_option &&
 +    server_mode(options);
 +  options->HiddenServiceStatistics =
 +    options->HiddenServiceStatistics_option && server_mode(options);
 +
 +  if (options->CellStatistics || options->DirReqStatistics ||
 +      options->EntryStatistics || options->ExitPortStatistics ||
 +      options->ConnDirectionStatistics ||
 +      options->HiddenServiceStatistics ||
 +      options->BridgeAuthoritativeDir) {
 +    time_t now = time(NULL);
 +    int print_notice = 0;
 +
 +    /* Only collect other relay-only statistics on relays. */
 +    if (!public_server_mode(options)) {
 +      options->CellStatistics = 0;
 +      options->EntryStatistics = 0;
 +      options->ConnDirectionStatistics = 0;
 +      options->ExitPortStatistics = 0;
 +    }
 +
 +    if ((!old_options || !old_options->CellStatistics) &&
 +        options->CellStatistics) {
 +      rep_hist_buffer_stats_init(now);
 +      print_notice = 1;
 +    }
 +    if ((!old_options || !old_options->DirReqStatistics) &&
 +        options->DirReqStatistics) {
 +      if (geoip_is_loaded(AF_INET)) {
 +        geoip_dirreq_stats_init(now);
 +        print_notice = 1;
 +      } else {
 +        /* disable statistics collection since we have no geoip file */
 +        options->DirReqStatistics = 0;
 +        if (options->ORPort_set)
 +          log_notice(LD_CONFIG, "Configured to measure directory request "
 +                                "statistics, but no GeoIP database found. "
 +                                "Please specify a GeoIP database using the "
 +                                "GeoIPFile option.");
 +      }
 +    }
 +    if ((!old_options || !old_options->EntryStatistics) &&
 +        options->EntryStatistics && !should_record_bridge_info(options)) {
 +      /* If we get here, we've started recording bridge info when we didn't
 +       * do so before.  Note that "should_record_bridge_info()" will
 +       * always be false at this point, because of the earlier block
 +       * that cleared EntryStatistics when public_server_mode() was false.
 +       * We're leaving it in as defensive programming. */
 +      if (geoip_is_loaded(AF_INET) || geoip_is_loaded(AF_INET6)) {
 +        geoip_entry_stats_init(now);
 +        print_notice = 1;
 +      } else {
 +        options->EntryStatistics = 0;
 +        log_notice(LD_CONFIG, "Configured to measure entry node "
 +                              "statistics, but no GeoIP database found. "
 +                              "Please specify a GeoIP database using the "
 +                              "GeoIPFile option.");
 +      }
 +    }
 +    if ((!old_options || !old_options->ExitPortStatistics) &&
 +        options->ExitPortStatistics) {
 +      rep_hist_exit_stats_init(now);
 +      print_notice = 1;
 +    }
 +    if ((!old_options || !old_options->ConnDirectionStatistics) &&
 +        options->ConnDirectionStatistics) {
 +      rep_hist_conn_stats_init(now);
 +    }
 +    if ((!old_options || !old_options->HiddenServiceStatistics) &&
 +        options->HiddenServiceStatistics) {
 +      log_info(LD_CONFIG, "Configured to measure hidden service statistics.");
 +      rep_hist_hs_stats_init(now);
 +    }
 +    if ((!old_options || !old_options->BridgeAuthoritativeDir) &&
 +        options->BridgeAuthoritativeDir) {
 +      rep_hist_desc_stats_init(now);
 +      print_notice = 1;
 +    }
 +    if (print_notice)
 +        log_notice(LD_CONFIG, "Configured to measure statistics. Look for "
 +                "the *-stats files that will first be written to the "
 +                 "data directory in 24 hours from now.");
 +  }
 +
 +  /* If we used to have statistics enabled but we just disabled them,
 +     stop gathering them.  */
 +  if (old_options && old_options->CellStatistics &&
 +      !options->CellStatistics)
 +    rep_hist_buffer_stats_term();
 +  if (old_options && old_options->DirReqStatistics &&
 +      !options->DirReqStatistics)
 +    geoip_dirreq_stats_term();
 +  if (old_options && old_options->EntryStatistics &&
 +      !options->EntryStatistics)
 +    geoip_entry_stats_term();
 +  if (old_options && old_options->HiddenServiceStatistics &&
 +      !options->HiddenServiceStatistics)
 +    rep_hist_hs_stats_term();
 +  if (old_options && old_options->ExitPortStatistics &&
 +      !options->ExitPortStatistics)
 +    rep_hist_exit_stats_term();
 +  if (old_options && old_options->ConnDirectionStatistics &&
 +      !options->ConnDirectionStatistics)
 +    rep_hist_conn_stats_term();
 +  if (old_options && old_options->BridgeAuthoritativeDir &&
 +      !options->BridgeAuthoritativeDir)
 +    rep_hist_desc_stats_term();
 +
 +  /* Since our options changed, we might need to regenerate and upload our
 +   * server descriptor.
 +   */
 +  if (!old_options ||
 +      options_transition_affects_descriptor(old_options, options))
 +    mark_my_descriptor_dirty("config change");
 +
 +  /* We may need to reschedule some directory stuff if our status changed. */
 +  if (old_options) {
 +    if (options_transition_affects_dirauth_timing(old_options, options)) {
 +      voting_schedule_recalculate_timing(options, time(NULL));
 +      reschedule_dirvote(options);
 +    }
 +    if (!bool_eq(directory_fetches_dir_info_early(options),
 +                 directory_fetches_dir_info_early(old_options)) ||
 +        !bool_eq(directory_fetches_dir_info_later(options),
 +                 directory_fetches_dir_info_later(old_options))) {
 +      /* Make sure update_router_have_minimum_dir_info() gets called. */
 +      router_dir_info_changed();
 +      /* We might need to download a new consensus status later or sooner than
 +       * we had expected. */
 +      update_consensus_networkstatus_fetch_time(time(NULL));
 +    }
 +  }
 +
 +  /* DoS mitigation subsystem only applies to public relay. */
 +  if (public_server_mode(options)) {
 +    /* If we are configured as a relay, initialize the subsystem. Even on HUP,
 +     * this is safe to call as it will load data from the current options
 +     * or/and the consensus. */
 +    dos_init();
 +  } else if (old_options && public_server_mode(old_options)) {
 +    /* Going from relay to non relay, clean it up. */
 +    dos_free_all();
 +  }
 +
 +  /* Load the webpage we're going to serve every time someone asks for '/' on
 +     our DirPort. */
 +  tor_free(global_dirfrontpagecontents);
 +  if (options->DirPortFrontPage) {
 +    global_dirfrontpagecontents =
 +      read_file_to_str(options->DirPortFrontPage, 0, NULL);
 +    if (!global_dirfrontpagecontents) {
 +      log_warn(LD_CONFIG,
 +               "DirPortFrontPage file '%s' not found. Continuing anyway.",
 +               options->DirPortFrontPage);
 +    }
 +  }
 +
 +  return 0;
 +}
 +
 +typedef enum {
 +  TAKES_NO_ARGUMENT = 0,
 +  ARGUMENT_NECESSARY = 1,
 +  ARGUMENT_OPTIONAL = 2
 +} takes_argument_t;
 +
 +static const struct {
 +  const char *name;
 +  takes_argument_t takes_argument;
 +} CMDLINE_ONLY_OPTIONS[] = {
 +  { "-f",                     ARGUMENT_NECESSARY },
 +  { "--allow-missing-torrc",  TAKES_NO_ARGUMENT },
 +  { "--defaults-torrc",       ARGUMENT_NECESSARY },
 +  { "--hash-password",        ARGUMENT_NECESSARY },
 +  { "--dump-config",          ARGUMENT_OPTIONAL },
 +  { "--list-fingerprint",     TAKES_NO_ARGUMENT },
 +  { "--keygen",               TAKES_NO_ARGUMENT },
 +  { "--key-expiration",       ARGUMENT_OPTIONAL },
 +  { "--newpass",              TAKES_NO_ARGUMENT },
 +  { "--no-passphrase",        TAKES_NO_ARGUMENT },
 +  { "--passphrase-fd",        ARGUMENT_NECESSARY },
 +  { "--verify-config",        TAKES_NO_ARGUMENT },
 +  { "--ignore-missing-torrc", TAKES_NO_ARGUMENT },
 +  { "--quiet",                TAKES_NO_ARGUMENT },
 +  { "--hush",                 TAKES_NO_ARGUMENT },
 +  { "--version",              TAKES_NO_ARGUMENT },
 +  { "--library-versions",     TAKES_NO_ARGUMENT },
 +  { "-h",                     TAKES_NO_ARGUMENT },
 +  { "--help",                 TAKES_NO_ARGUMENT },
 +  { "--list-torrc-options",   TAKES_NO_ARGUMENT },
 +  { "--list-deprecated-options",TAKES_NO_ARGUMENT },
 +  { "--nt-service",           TAKES_NO_ARGUMENT },
 +  { "-nt-service",            TAKES_NO_ARGUMENT },
 +  { NULL, 0 },
 +};
 +
 +/** Helper: Read a list of configuration options from the command line.  If
 + * successful, or if ignore_errors is set, put them in *<b>result</b>, put the
 + * commandline-only options in *<b>cmdline_result</b>, and return 0;
 + * otherwise, return -1 and leave *<b>result</b> and <b>cmdline_result</b>
 + * alone. */
 +int
 +config_parse_commandline(int argc, char **argv, int ignore_errors,
 +                         config_line_t **result,
 +                         config_line_t **cmdline_result)
 +{
 +  config_line_t *param = NULL;
 +
 +  config_line_t *front = NULL;
 +  config_line_t **new = &front;
 +
 +  config_line_t *front_cmdline = NULL;
 +  config_line_t **new_cmdline = &front_cmdline;
 +
 +  char *s, *arg;
 +  int i = 1;
 +
 +  while (i < argc) {
 +    unsigned command = CONFIG_LINE_NORMAL;
 +    takes_argument_t want_arg = ARGUMENT_NECESSARY;
 +    int is_cmdline = 0;
 +    int j;
 +
 +    for (j = 0; CMDLINE_ONLY_OPTIONS[j].name != NULL; ++j) {
 +      if (!strcmp(argv[i], CMDLINE_ONLY_OPTIONS[j].name)) {
 +        is_cmdline = 1;
 +        want_arg = CMDLINE_ONLY_OPTIONS[j].takes_argument;
 +        break;
 +      }
 +    }
 +
 +    s = argv[i];
 +
 +    /* Each keyword may be prefixed with one or two dashes. */
 +    if (*s == '-')
 +      s++;
 +    if (*s == '-')
 +      s++;
 +    /* Figure out the command, if any. */
 +    if (*s == '+') {
 +      s++;
 +      command = CONFIG_LINE_APPEND;
 +    } else if (*s == '/') {
 +      s++;
 +      command = CONFIG_LINE_CLEAR;
 +      /* A 'clear' command has no argument. */
 +      want_arg = 0;
 +    }
 +
 +    const int is_last = (i == argc-1);
 +
 +    if (want_arg == ARGUMENT_NECESSARY && is_last) {
 +      if (ignore_errors) {
 +        arg = tor_strdup("");
 +      } else {
 +        log_warn(LD_CONFIG,"Command-line option '%s' with no value. Failing.",
 +            argv[i]);
 +        config_free_lines(front);
 +        config_free_lines(front_cmdline);
 +        return -1;
 +      }
 +    } else if (want_arg == ARGUMENT_OPTIONAL && is_last) {
 +      arg = tor_strdup("");
 +    } else {
 +      arg = (want_arg != TAKES_NO_ARGUMENT) ? tor_strdup(argv[i+1]) :
 +                                              tor_strdup("");
 +    }
 +
 +    param = tor_malloc_zero(sizeof(config_line_t));
 +    param->key = is_cmdline ? tor_strdup(argv[i]) :
 +                   tor_strdup(config_expand_abbrev(&options_format, s, 1, 1));
 +    param->value = arg;
 +    param->command = command;
 +    param->next = NULL;
 +    log_debug(LD_CONFIG, "command line: parsed keyword '%s', value '%s'",
 +        param->key, param->value);
 +
 +    if (is_cmdline) {
 +      *new_cmdline = param;
 +      new_cmdline = &((*new_cmdline)->next);
 +    } else {
 +      *new = param;
 +      new = &((*new)->next);
 +    }
 +
 +    i += want_arg ? 2 : 1;
 +  }
 +  *cmdline_result = front_cmdline;
 +  *result = front;
 +  return 0;
 +}
 +
 +/** Return true iff key is a valid configuration option. */
 +int
 +option_is_recognized(const char *key)
 +{
 +  const config_var_t *var = config_find_option(&options_format, key);
 +  return (var != NULL);
 +}
 +
 +/** Return the canonical name of a configuration option, or NULL
 + * if no such option exists. */
 +const char *
 +option_get_canonical_name(const char *key)
 +{
 +  const config_var_t *var = config_find_option(&options_format, key);
 +  return var ? var->name : NULL;
 +}
 +
 +/** Return a canonical list of the options assigned for key.
 + */
 +config_line_t *
 +option_get_assignment(const or_options_t *options, const char *key)
 +{
 +  return config_get_assigned_option(&options_format, options, key, 1);
 +}
 +
 +/** Try assigning <b>list</b> to the global options. You do this by duping
 + * options, assigning list to the new one, then validating it. If it's
 + * ok, then throw out the old one and stick with the new one. Else,
 + * revert to old and return failure.  Return SETOPT_OK on success, or
 + * a setopt_err_t on failure.
 + *
 + * If not success, point *<b>msg</b> to a newly allocated string describing
 + * what went wrong.
 + */
 +setopt_err_t
 +options_trial_assign(config_line_t *list, unsigned flags, char **msg)
 +{
 +  int r;
 +  or_options_t *trial_options = config_dup(&options_format, get_options());
 +
 +  if ((r=config_assign(&options_format, trial_options,
 +                       list, flags, msg)) < 0) {
 +    or_options_free(trial_options);
 +    return r;
 +  }
 +
 +  setopt_err_t rv;
 +  or_options_t *cur_options = get_options_mutable();
 +
 +  in_option_validation = 1;
 +
 +  if (options_validate(cur_options, trial_options,
 +                       global_default_options, 1, msg) < 0) {
 +    or_options_free(trial_options);
 +    rv = SETOPT_ERR_PARSE; /*XXX make this a separate return value. */
 +    goto done;
 +  }
 +
 +  if (options_transition_allowed(cur_options, trial_options, msg) < 0) {
 +    or_options_free(trial_options);
 +    rv = SETOPT_ERR_TRANSITION;
 +    goto done;
 +  }
 +  in_option_validation = 0;
 +
 +  if (set_options(trial_options, msg)<0) {
 +    or_options_free(trial_options);
 +    rv = SETOPT_ERR_SETTING;
 +    goto done;
 +  }
 +
 +  /* we liked it. put it in place. */
 +  rv = SETOPT_OK;
 + done:
 +  in_option_validation = 0;
 +  return rv;
 +}
 +
 +/** Print a usage message for tor. */
 +static void
 +print_usage(void)
 +{
 +  printf(
 +"Copyright (c) 2001-2004, Roger Dingledine\n"
 +"Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson\n"
 +"Copyright (c) 2007-2019, The Tor Project, Inc.\n\n"
 +"tor -f <torrc> [args]\n"
 +"See man page for options, or https://www.torproject.org/ for "
 +"documentation.\n");
 +}
 +
 +/** Print all non-obsolete torrc options. */
 +static void
 +list_torrc_options(void)
 +{
 +  int i;
 +  for (i = 0; option_vars_[i].name; ++i) {
 +    const config_var_t *var = &option_vars_[i];
 +    if (var->type == CONFIG_TYPE_OBSOLETE ||
 +        var->type == CONFIG_TYPE_LINELIST_V)
 +      continue;
 +    printf("%s\n", var->name);
 +  }
 +}
 +
 +/** Print all deprecated but non-obsolete torrc options. */
 +static void
 +list_deprecated_options(void)
 +{
 +  const config_deprecation_t *d;
 +  for (d = option_deprecation_notes_; d->name; ++d) {
 +    printf("%s\n", d->name);
 +  }
 +}
 +
 +/** Last value actually set by resolve_my_address. */
 +static uint32_t last_resolved_addr = 0;
 +
 +/** Accessor for last_resolved_addr from outside this file. */
 +uint32_t
 +get_last_resolved_addr(void)
 +{
 +  return last_resolved_addr;
 +}
 +
 +/** Reset last_resolved_addr from outside this file. */
 +void
 +reset_last_resolved_addr(void)
 +{
 +  last_resolved_addr = 0;
 +}
 +
 +/* Return true if <b>options</b> is using the default authorities, and false
 + * if any authority-related option has been overridden. */
 +int
 +using_default_dir_authorities(const or_options_t *options)
 +{
 +  return (!options->DirAuthorities && !options->AlternateDirAuthority);
 +}
 +
 +/**
 + * Attempt getting our non-local (as judged by tor_addr_is_internal()
 + * function) IP address using following techniques, listed in
 + * order from best (most desirable, try first) to worst (least
 + * desirable, try if everything else fails).
 + *
 + * First, attempt using <b>options-\>Address</b> to get our
 + * non-local IP address.
 + *
 + * If <b>options-\>Address</b> represents a non-local IP address,
 + * consider it ours.
 + *
 + * If <b>options-\>Address</b> is a DNS name that resolves to
 + * a non-local IP address, consider this IP address ours.
 + *
 + * If <b>options-\>Address</b> is NULL, fall back to getting local
 + * hostname and using it in above-described ways to try and
 + * get our IP address.
 + *
 + * In case local hostname cannot be resolved to a non-local IP
 + * address, try getting an IP address of network interface
 + * in hopes it will be non-local one.
 + *
 + * Fail if one or more of the following is true:
 + *   - DNS name in <b>options-\>Address</b> cannot be resolved.
 + *   - <b>options-\>Address</b> is a local host address.
 + *   - Attempt at getting local hostname fails.
 + *   - Attempt at getting network interface address fails.
 + *
 + * Return 0 if all is well, or -1 if we can't find a suitable
 + * public IP address.
 + *
 + * If we are returning 0:
 + *   - Put our public IP address (in host order) into *<b>addr_out</b>.
 + *   - If <b>method_out</b> is non-NULL, set *<b>method_out</b> to a static
 + *     string describing how we arrived at our answer.
 + *      - "CONFIGURED" - parsed from IP address string in
 + *        <b>options-\>Address</b>
 + *      - "RESOLVED" - resolved from DNS name in <b>options-\>Address</b>
 + *      - "GETHOSTNAME" - resolved from a local hostname.
 + *      - "INTERFACE" - retrieved from a network interface.
 + *   - If <b>hostname_out</b> is non-NULL, and we resolved a hostname to
 + *     get our address, set *<b>hostname_out</b> to a newly allocated string
 + *     holding that hostname. (If we didn't get our address by resolving a
 + *     hostname, set *<b>hostname_out</b> to NULL.)
 + *
 + * XXXX ipv6
 + */
 +int
 +resolve_my_address(int warn_severity, const or_options_t *options,
 +                   uint32_t *addr_out,
 +                   const char **method_out, char **hostname_out)
 +{
 +  struct in_addr in;
 +  uint32_t addr; /* host order */
 +  char hostname[256];
 +  const char *method_used;
 +  const char *hostname_used;
 +  int explicit_ip=1;
 +  int explicit_hostname=1;
 +  int from_interface=0;
 +  char *addr_string = NULL;
 +  const char *address = options->Address;
 +  int notice_severity = warn_severity <= LOG_NOTICE ?
 +                          LOG_NOTICE : warn_severity;
 +
 +  tor_addr_t myaddr;
 +  tor_assert(addr_out);
 +
 +  /*
 +   * Step one: Fill in 'hostname' to be our best guess.
 +   */
 +
 +  if (address && *address) {
 +    strlcpy(hostname, address, sizeof(hostname));
 +  } else { /* then we need to guess our address */
 +    explicit_ip = 0; /* it's implicit */
 +    explicit_hostname = 0; /* it's implicit */
 +
 +    if (tor_gethostname(hostname, sizeof(hostname)) < 0) {
 +      log_fn(warn_severity, LD_NET,"Error obtaining local hostname");
 +      return -1;
 +    }
 +    log_debug(LD_CONFIG, "Guessed local host name as '%s'", hostname);
 +  }
 +
 +  /*
 +   * Step two: Now that we know 'hostname', parse it or resolve it. If
 +   * it doesn't parse or resolve, look at the interface address. Set 'addr'
 +   * to be our (host-order) 32-bit answer.
 +   */
 +
 +  if (tor_inet_aton(hostname, &in) == 0) {
 +    /* then we have to resolve it */
 +    explicit_ip = 0;
 +    if (tor_lookup_hostname(hostname, &addr)) { /* failed to resolve */
 +      uint32_t interface_ip; /* host order */
 +
 +      if (explicit_hostname) {
 +        log_fn(warn_severity, LD_CONFIG,
 +               "Could not resolve local Address '%s'. Failing.", hostname);
 +        return -1;
 +      }
 +      log_fn(notice_severity, LD_CONFIG,
 +             "Could not resolve guessed local hostname '%s'. "
 +             "Trying something else.", hostname);
 +      if (get_interface_address(warn_severity, &interface_ip)) {
 +        log_fn(warn_severity, LD_CONFIG,
 +               "Could not get local interface IP address. Failing.");
 +        return -1;
 +      }
 +      from_interface = 1;
 +      addr = interface_ip;
 +      log_fn(notice_severity, LD_CONFIG, "Learned IP address '%s' for "
 +             "local interface. Using that.", fmt_addr32(addr));
 +      strlcpy(hostname, "<guessed from interfaces>", sizeof(hostname));
 +    } else { /* resolved hostname into addr */
 +      tor_addr_from_ipv4h(&myaddr, addr);
 +
 +      if (!explicit_hostname &&
 +          tor_addr_is_internal(&myaddr, 0)) {
 +        tor_addr_t interface_ip;
 +
 +        log_fn(notice_severity, LD_CONFIG, "Guessed local hostname '%s' "
 +               "resolves to a private IP address (%s). Trying something "
 +               "else.", hostname, fmt_addr32(addr));
 +
 +        if (get_interface_address6(warn_severity, AF_INET, &interface_ip)<0) {
 +          log_fn(warn_severity, LD_CONFIG,
 +                 "Could not get local interface IP address. Too bad.");
 +        } else if (tor_addr_is_internal(&interface_ip, 0)) {
 +          log_fn(notice_severity, LD_CONFIG,
 +                 "Interface IP address '%s' is a private address too. "
 +                 "Ignoring.", fmt_addr(&interface_ip));
 +        } else {
 +          from_interface = 1;
 +          addr = tor_addr_to_ipv4h(&interface_ip);
 +          log_fn(notice_severity, LD_CONFIG,
 +                 "Learned IP address '%s' for local interface."
 +                 " Using that.", fmt_addr32(addr));
 +          strlcpy(hostname, "<guessed from interfaces>", sizeof(hostname));
 +        }
 +      }
 +    }
 +  } else {
 +    addr = ntohl(in.s_addr); /* set addr so that addr_string is not
 +                              * illformed */
 +  }
 +
 +  /*
 +   * Step three: Check whether 'addr' is an internal IP address, and error
 +   * out if it is and we don't want that.
 +   */
 +
 +  tor_addr_from_ipv4h(&myaddr,addr);
 +
 +  addr_string = tor_dup_ip(addr);
 +  if (tor_addr_is_internal(&myaddr, 0)) {
 +    /* make sure we're ok with publishing an internal IP */
 +    if (using_default_dir_authorities(options)) {
 +      /* if they are using the default authorities, disallow internal IPs
 +       * always. */
 +      log_fn(warn_severity, LD_CONFIG,
 +             "Address '%s' resolves to private IP address '%s'. "
 +             "Tor servers that use the default DirAuthorities must have "
 +             "public IP addresses.", hostname, addr_string);
 +      tor_free(addr_string);
 +      return -1;
 +    }
 +    if (!explicit_ip) {
 +      /* even if they've set their own authorities, require an explicit IP if
 +       * they're using an internal address. */
 +      log_fn(warn_severity, LD_CONFIG, "Address '%s' resolves to private "
 +             "IP address '%s'. Please set the Address config option to be "
 +             "the IP address you want to use.", hostname, addr_string);
 +      tor_free(addr_string);
 +      return -1;
 +    }
 +  }
 +
 +  /*
 +   * Step four: We have a winner! 'addr' is our answer for sure, and
 +   * 'addr_string' is its string form. Fill out the various fields to
 +   * say how we decided it.
 +   */
 +
 +  log_debug(LD_CONFIG, "Resolved Address to '%s'.", addr_string);
 +
 +  if (explicit_ip) {
 +    method_used = "CONFIGURED";
 +    hostname_used = NULL;
 +  } else if (explicit_hostname) {
 +    method_used = "RESOLVED";
 +    hostname_used = hostname;
 +  } else if (from_interface) {
 +    method_used = "INTERFACE";
 +    hostname_used = NULL;
 +  } else {
 +    method_used = "GETHOSTNAME";
 +    hostname_used = hostname;
 +  }
 +
 +  *addr_out = addr;
 +  if (method_out)
 +    *method_out = method_used;
 +  if (hostname_out)
 +    *hostname_out = hostname_used ? tor_strdup(hostname_used) : NULL;
 +
 +  /*
 +   * Step five: Check if the answer has changed since last time (or if
 +   * there was no last time), and if so call various functions to keep
 +   * us up-to-date.
 +   */
 +
 +  if (last_resolved_addr && last_resolved_addr != *addr_out) {
 +    /* Leave this as a notice, regardless of the requested severity,
 +     * at least until dynamic IP address support becomes bulletproof. */
 +    log_notice(LD_NET,
 +               "Your IP address seems to have changed to %s "
 +               "(METHOD=%s%s%s). Updating.",
 +               addr_string, method_used,
 +               hostname_used ? " HOSTNAME=" : "",
 +               hostname_used ? hostname_used : "");
 +    ip_address_changed(0);
 +  }
 +
 +  if (last_resolved_addr != *addr_out) {
 +    control_event_server_status(LOG_NOTICE,
 +                                "EXTERNAL_ADDRESS ADDRESS=%s METHOD=%s%s%s",
 +                                addr_string, method_used,
 +                                hostname_used ? " HOSTNAME=" : "",
 +                                hostname_used ? hostname_used : "");
 +  }
 +  last_resolved_addr = *addr_out;
 +
 +  /*
 +   * And finally, clean up and return success.
 +   */
 +
 +  tor_free(addr_string);
 +  return 0;
 +}
 +
 +/** Return true iff <b>addr</b> is judged to be on the same network as us, or
 + * on a private network.
 + */
 +MOCK_IMPL(int,
 +is_local_addr, (const tor_addr_t *addr))
 +{
 +  if (tor_addr_is_internal(addr, 0))
 +    return 1;
 +  /* Check whether ip is on the same /24 as we are. */
 +  if (get_options()->EnforceDistinctSubnets == 0)
 +    return 0;
 +  if (tor_addr_family(addr) == AF_INET) {
 +    uint32_t ip = tor_addr_to_ipv4h(addr);
 +
 +    /* It's possible that this next check will hit before the first time
 +     * resolve_my_address actually succeeds.  (For clients, it is likely that
 +     * resolve_my_address will never be called at all).  In those cases,
 +     * last_resolved_addr will be 0, and so checking to see whether ip is on
 +     * the same /24 as last_resolved_addr will be the same as checking whether
 +     * it was on net 0, which is already done by tor_addr_is_internal.
 +     */
 +    if ((last_resolved_addr & (uint32_t)0xffffff00ul)
 +        == (ip & (uint32_t)0xffffff00ul))
 +      return 1;
 +  }
 +  return 0;
 +}
 +
 +/** Return a new empty or_options_t.  Used for testing. */
 +or_options_t *
 +options_new(void)
 +{
 +  return config_new(&options_format);
 +}
 +
 +/** Set <b>options</b> to hold reasonable defaults for most options.
 + * Each option defaults to zero. */
 +void
 +options_init(or_options_t *options)
 +{
 +  config_init(&options_format, options);
 +}
 +
 +/** Return a string containing a possible configuration file that would give
 + * the configuration in <b>options</b>.  If <b>minimal</b> is true, do not
 + * include options that are the same as Tor's defaults.
 + */
 +char *
 +options_dump(const or_options_t *options, int how_to_dump)
 +{
 +  const or_options_t *use_defaults;
 +  int minimal;
 +  switch (how_to_dump) {
 +    case OPTIONS_DUMP_MINIMAL:
 +      use_defaults = global_default_options;
 +      minimal = 1;
 +      break;
 +    case OPTIONS_DUMP_DEFAULTS:
 +      use_defaults = NULL;
 +      minimal = 1;
 +      break;
 +    case OPTIONS_DUMP_ALL:
 +      use_defaults = NULL;
 +      minimal = 0;
 +      break;
 +    default:
 +      log_warn(LD_BUG, "Bogus value for how_to_dump==%d", how_to_dump);
 +      return NULL;
 +  }
 +
 +  return config_dump(&options_format, use_defaults, options, minimal, 0);
 +}
 +
 +/** Return 0 if every element of sl is a string holding a decimal
 + * representation of a port number, or if sl is NULL.
 + * Otherwise set *msg and return -1. */
 +static int
 +validate_ports_csv(smartlist_t *sl, const char *name, char **msg)
 +{
 +  int i;
 +  tor_assert(name);
 +
 +  if (!sl)
 +    return 0;
 +
 +  SMARTLIST_FOREACH(sl, const char *, cp,
 +  {
 +    i = atoi(cp);
 +    if (i < 1 || i > 65535) {
 +      tor_asprintf(msg, "Port '%s' out of range in %s", cp, name);
 +      return -1;
 +    }
 +  });
 +  return 0;
 +}
 +
 +/** If <b>value</b> exceeds ROUTER_MAX_DECLARED_BANDWIDTH, write
 + * a complaint into *<b>msg</b> using string <b>desc</b>, and return -1.
 + * Else return 0.
 + */
 +static int
 +ensure_bandwidth_cap(uint64_t *value, const char *desc, char **msg)
 +{
 +  if (*value > ROUTER_MAX_DECLARED_BANDWIDTH) {
 +    /* This handles an understandable special case where somebody says "2gb"
 +     * whereas our actual maximum is 2gb-1 (INT_MAX) */
 +    --*value;
 +  }
 +  if (*value > ROUTER_MAX_DECLARED_BANDWIDTH) {
 +    tor_asprintf(msg, "%s (%"PRIu64") must be at most %d",
 +                 desc, (*value),
 +                 ROUTER_MAX_DECLARED_BANDWIDTH);
 +    return -1;
 +  }
 +  return 0;
 +}
 +
 +/** Parse an authority type from <b>options</b>-\>PublishServerDescriptor
 + * and write it to <b>options</b>-\>PublishServerDescriptor_. Treat "1"
 + * as "v3" unless BridgeRelay is 1, in which case treat it as "bridge".
 + * Treat "0" as "".
 + * Return 0 on success or -1 if not a recognized authority type (in which
 + * case the value of PublishServerDescriptor_ is undefined). */
 +static int
 +compute_publishserverdescriptor(or_options_t *options)
 +{
 +  smartlist_t *list = options->PublishServerDescriptor;
 +  dirinfo_type_t *auth = &options->PublishServerDescriptor_;
 +  *auth = NO_DIRINFO;
 +  if (!list) /* empty list, answer is none */
 +    return 0;
 +  SMARTLIST_FOREACH_BEGIN(list, const char *, string) {
 +    if (!strcasecmp(string, "v1"))
 +      log_warn(LD_CONFIG, "PublishServerDescriptor v1 has no effect, because "
 +                          "there are no v1 directory authorities anymore.");
 +    else if (!strcmp(string, "1"))
 +      if (options->BridgeRelay)
 +        *auth |= BRIDGE_DIRINFO;
 +      else
 +        *auth |= V3_DIRINFO;
 +    else if (!strcasecmp(string, "v2"))
 +      log_warn(LD_CONFIG, "PublishServerDescriptor v2 has no effect, because "
 +                          "there are no v2 directory authorities anymore.");
 +    else if (!strcasecmp(string, "v3"))
 +      *auth |= V3_DIRINFO;
 +    else if (!strcasecmp(string, "bridge"))
 +      *auth |= BRIDGE_DIRINFO;
 +    else if (!strcasecmp(string, "hidserv"))
 +      log_warn(LD_CONFIG,
 +               "PublishServerDescriptor hidserv is invalid. See "
 +               "PublishHidServDescriptors.");
 +    else if (!strcasecmp(string, "") || !strcmp(string, "0"))
 +      /* no authority */;
 +    else
 +      return -1;
 +  } SMARTLIST_FOREACH_END(string);
 +  return 0;
 +}
 +
 +/** Lowest allowable value for RendPostPeriod; if this is too low, hidden
 + * services can overload the directory system. */
 +#define MIN_REND_POST_PERIOD (10*60)
 +#define MIN_REND_POST_PERIOD_TESTING (5)
 +
 +/** Highest allowable value for CircuitsAvailableTimeout.
 + * If this is too large, client connections will stay open for too long,
 + * incurring extra padding overhead. */
 +#define MAX_CIRCS_AVAILABLE_TIME (24*60*60)
 +
 +/** Highest allowable value for RendPostPeriod. */
 +#define MAX_DIR_PERIOD ((7*24*60*60)/2)
 +
 +/** Lowest allowable value for MaxCircuitDirtiness; if this is too low, Tor
 + * will generate too many circuits and potentially overload the network. */
 +#define MIN_MAX_CIRCUIT_DIRTINESS 10
 +
 +/** Highest allowable value for MaxCircuitDirtiness: prevents time_t
 + * overflows. */
 +#define MAX_MAX_CIRCUIT_DIRTINESS (30*24*60*60)
 +
 +/** Lowest allowable value for CircuitStreamTimeout; if this is too low, Tor
 + * will generate too many circuits and potentially overload the network. */
 +#define MIN_CIRCUIT_STREAM_TIMEOUT 10
 +
 +/** Lowest recommended value for CircuitBuildTimeout; if it is set too low
 + * and LearnCircuitBuildTimeout is off, the failure rate for circuit
 + * construction may be very high.  In that case, if it is set below this
 + * threshold emit a warning.
 + * */
 +#define RECOMMENDED_MIN_CIRCUIT_BUILD_TIMEOUT (10)
 +
 +static int
 +options_validate_cb(void *old_options, void *options, void *default_options,
 +                    int from_setconf, char **msg)
 +{
 +  in_option_validation = 1;
 +  int rv = options_validate(old_options, options, default_options,
 +                          from_setconf, msg);
 +  in_option_validation = 0;
 +  return rv;
 +}
 +
 +/** Callback to free an or_options_t */
 +static void
 +options_free_cb(void *options)
 +{
 +  or_options_free_(options);
 +}
 +
 +#define REJECT(arg) \
 +  STMT_BEGIN *msg = tor_strdup(arg); return -1; STMT_END
 +#if defined(__GNUC__) && __GNUC__ <= 3
 +#define COMPLAIN(args...) \
 +  STMT_BEGIN log_warn(LD_CONFIG, args); STMT_END
 +#else
 +#define COMPLAIN(args, ...)                                     \
 +  STMT_BEGIN log_warn(LD_CONFIG, args, ##__VA_ARGS__); STMT_END
 +#endif /* defined(__GNUC__) && __GNUC__ <= 3 */
 +
 +/** Log a warning message iff <b>filepath</b> is not absolute.
 + * Warning message must contain option name <b>option</b> and
 + * an absolute path that <b>filepath</b> will resolve to.
 + *
 + * In case <b>filepath</b> is absolute, do nothing.
 + *
 + * Return 1 if there were relative paths; 0 otherwise.
 + */
 +static int
 +warn_if_option_path_is_relative(const char *option,
 +                                char *filepath)
 +{
 +  if (filepath && path_is_relative(filepath)) {
 +    char *abs_path = make_path_absolute(filepath);
 +    COMPLAIN("Path for %s (%s) is relative and will resolve to %s."
 +             " Is this what you wanted?", option, filepath, abs_path);
 +    tor_free(abs_path);
 +    return 1;
 +  }
 +  return 0;
 +}
 +
 +/** Scan <b>options</b> for occurrences of relative file/directory
 + * path and log a warning whenever it is found.
 + *
 + * Return 1 if there were relative paths; 0 otherwise.
 + */
 +static int
 +warn_about_relative_paths(or_options_t *options)
 +{
 +  tor_assert(options);
 +  int n = 0;
 +
 +  n += warn_if_option_path_is_relative("CookieAuthFile",
 +                                       options->CookieAuthFile);
 +  n += warn_if_option_path_is_relative("ExtORPortCookieAuthFile",
 +                                       options->ExtORPortCookieAuthFile);
 +  n += warn_if_option_path_is_relative("DirPortFrontPage",
 +                                       options->DirPortFrontPage);
 +  n += warn_if_option_path_is_relative("V3BandwidthsFile",
 +                                       options->V3BandwidthsFile);
 +  n += warn_if_option_path_is_relative("ControlPortWriteToFile",
 +                                       options->ControlPortWriteToFile);
 +  n += warn_if_option_path_is_relative("GeoIPFile",options->GeoIPFile);
 +  n += warn_if_option_path_is_relative("GeoIPv6File",options->GeoIPv6File);
 +  n += warn_if_option_path_is_relative("Log",options->DebugLogFile);
 +  n += warn_if_option_path_is_relative("AccelDir",options->AccelDir);
 +  n += warn_if_option_path_is_relative("DataDirectory",options->DataDirectory);
 +  n += warn_if_option_path_is_relative("PidFile",options->PidFile);
 +  n += warn_if_option_path_is_relative("ClientOnionAuthDir",
 +                                        options->ClientOnionAuthDir);
 +
 +  for (config_line_t *hs_line = options->RendConfigLines; hs_line;
 +       hs_line = hs_line->next) {
 +    if (!strcasecmp(hs_line->key, "HiddenServiceDir"))
 +      n += warn_if_option_path_is_relative("HiddenServiceDir",hs_line->value);
 +  }
 +  return n != 0;
 +}
 +
 +/* Validate options related to the scheduler. From the Schedulers list, the
 + * SchedulerTypes_ list is created with int values so once we select the
 + * scheduler, which can happen anytime at runtime, we don't have to parse
 + * strings and thus be quick.
 + *
 + * Return 0 on success else -1 and msg is set with an error message. */
 +static int
 +options_validate_scheduler(or_options_t *options, char **msg)
 +{
 +  tor_assert(options);
 +  tor_assert(msg);
 +
 +  if (!options->Schedulers || smartlist_len(options->Schedulers) == 0) {
 +    REJECT("Empty Schedulers list. Either remove the option so the defaults "
 +           "can be used or set at least one value.");
 +  }
 +  /* Ok, we do have scheduler types, validate them. */
 +  options->SchedulerTypes_ = smartlist_new();
 +  SMARTLIST_FOREACH_BEGIN(options->Schedulers, const char *, type) {
 +    int *sched_type;
 +    if (!strcasecmp("KISTLite", type)) {
 +      sched_type = tor_malloc_zero(sizeof(int));
 +      *sched_type = SCHEDULER_KIST_LITE;
 +      smartlist_add(options->SchedulerTypes_, sched_type);
 +    } else if (!strcasecmp("KIST", type)) {
 +      sched_type = tor_malloc_zero(sizeof(int));
 +      *sched_type = SCHEDULER_KIST;
 +      smartlist_add(options->SchedulerTypes_, sched_type);
 +    } else if (!strcasecmp("Vanilla", type)) {
 +      sched_type = tor_malloc_zero(sizeof(int));
 +      *sched_type = SCHEDULER_VANILLA;
 +      smartlist_add(options->SchedulerTypes_, sched_type);
 +    } else {
 +      tor_asprintf(msg, "Unknown type %s in option Schedulers. "
 +                        "Possible values are KIST, KISTLite and Vanilla.",
 +                   escaped(type));
 +      return -1;
 +    }
 +  } SMARTLIST_FOREACH_END(type);
 +
 +  if (options->KISTSockBufSizeFactor < 0) {
 +    REJECT("KISTSockBufSizeFactor must be at least 0");
 +  }
 +
 +  /* Don't need to validate that the Interval is less than anything because
 +   * zero is valid and all negative values are valid. */
 +  if (options->KISTSchedRunInterval > KIST_SCHED_RUN_INTERVAL_MAX) {
 +    tor_asprintf(msg, "KISTSchedRunInterval must not be more than %d (ms)",
 +                 KIST_SCHED_RUN_INTERVAL_MAX);
 +    return -1;
 +  }
 +
 +  return 0;
 +}
 +
 +/* Validate options related to single onion services.
 + * Modifies some options that are incompatible with single onion services.
 + * On failure returns -1, and sets *msg to an error string.
 + * Returns 0 on success. */
 +STATIC int
 +options_validate_single_onion(or_options_t *options, char **msg)
 +{
 +  /* The two single onion service options must have matching values. */
 +  if (options->HiddenServiceSingleHopMode &&
 +      !options->HiddenServiceNonAnonymousMode) {
 +    REJECT("HiddenServiceSingleHopMode does not provide any server anonymity. "
 +           "It must be used with HiddenServiceNonAnonymousMode set to 1.");
 +  }
 +  if (options->HiddenServiceNonAnonymousMode &&
 +      !options->HiddenServiceSingleHopMode) {
 +    REJECT("HiddenServiceNonAnonymousMode does not provide any server "
 +           "anonymity. It must be used with HiddenServiceSingleHopMode set to "
 +           "1.");
 +  }
 +
 +  /* Now that we've checked that the two options are consistent, we can safely
 +   * call the rend_service_* functions that abstract these options. */
 +
 +  /* If you run an anonymous client with an active Single Onion service, the
 +   * client loses anonymity. */
 +  const int client_port_set = (options->SocksPort_set ||
 +                               options->TransPort_set ||
 +                               options->NATDPort_set ||
 +                               options->DNSPort_set ||
 +                               options->HTTPTunnelPort_set);
 +  if (rend_service_non_anonymous_mode_enabled(options) && client_port_set) {
 +    REJECT("HiddenServiceNonAnonymousMode is incompatible with using Tor as "
 +           "an anonymous client. Please set Socks/Trans/NATD/DNSPort to 0, or "
 +           "revert HiddenServiceNonAnonymousMode to 0.");
 +  }
 +
 +  if (rend_service_allow_non_anonymous_connection(options)
 +      && options->UseEntryGuards) {
 +    /* Single Onion services only use entry guards when uploading descriptors;
 +     * all other connections are one-hop. Further, Single Onions causes the
 +     * hidden service code to do things which break the path bias
 +     * detector, and it's far easier to turn off entry guards (and
 +     * thus the path bias detector with it) than to figure out how to
 +     * make path bias compatible with single onions.
 +     */
 +    log_notice(LD_CONFIG,
 +               "HiddenServiceSingleHopMode is enabled; disabling "
 +               "UseEntryGuards.");
 +    options->UseEntryGuards = 0;
 +  }
 +
 +  return 0;
 +}
 +
 +/** Return 0 if every setting in <b>options</b> is reasonable, is a
 + * permissible transition from <b>old_options</b>, and none of the
 + * testing-only settings differ from <b>default_options</b> unless in
 + * testing mode.  Else return -1.  Should have no side effects, except for
 + * normalizing the contents of <b>options</b>.
 + *
 + * On error, tor_strdup an error explanation into *<b>msg</b>.
 + *
 + * XXX
 + * If <b>from_setconf</b>, we were called by the controller, and our
 + * Log line should stay empty. If it's 0, then give us a default log
 + * if there are no logs defined.
 + */
 +STATIC int
 +options_validate(or_options_t *old_options, or_options_t *options,
 +                 or_options_t *default_options, int from_setconf, char **msg)
 +{
 +  config_line_t *cl;
 +  const char *uname = get_uname();
 +  int n_ports=0;
 +  int world_writable_control_socket=0;
 +
 +  tor_assert(msg);
 +  *msg = NULL;
 +
 +  if (parse_ports(options, 1, msg, &n_ports,
 +                  &world_writable_control_socket) < 0)
 +    return -1;
 +
 +  /* Set UseEntryGuards from the configured value, before we check it below.
 +   * We change UseEntryGuards when it's incompatible with other options,
 +   * but leave UseEntryGuards_option with the original value.
 +   * Always use the value of UseEntryGuards, not UseEntryGuards_option. */
 +  options->UseEntryGuards = options->UseEntryGuards_option;
 +
 +  if (server_mode(options) &&
 +      (!strcmpstart(uname, "Windows 95") ||
 +       !strcmpstart(uname, "Windows 98") ||
 +       !strcmpstart(uname, "Windows Me"))) {
 +    log_warn(LD_CONFIG, "Tor is running as a server, but you are "
 +        "running %s; this probably won't work. See "
 +        "https://www.torproject.org/docs/faq.html#BestOSForRelay "
 +        "for details.", uname);
 +  }
 +
 +  if (parse_outbound_addresses(options, 1, msg) < 0)
 +    return -1;
 +
 +  if (validate_data_directories(options)<0)
 +    REJECT("Invalid DataDirectory");
 +
 +  /* need to check for relative paths after we populate
 +   * options->DataDirectory (just above). */
 +  if (warn_about_relative_paths(options) && options->RunAsDaemon) {
 +    REJECT("You have specified at least one relative path (see above) "
 +           "with the RunAsDaemon option. RunAsDaemon is not compatible "
 +           "with relative paths.");
 +  }
 +
 +  if (options->Nickname == NULL) {
 +    if (server_mode(options)) {
 +      options->Nickname = tor_strdup(UNNAMED_ROUTER_NICKNAME);
 +    }
 +  } else {
 +    if (!is_legal_nickname(options->Nickname)) {
 +      tor_asprintf(msg,
 +          "Nickname '%s', nicknames must be between 1 and 19 characters "
 +          "inclusive, and must contain only the characters [a-zA-Z0-9].",
 +          options->Nickname);
 +      return -1;
 +    }
 +  }
 +
 +  if (server_mode(options) && !options->ContactInfo)
 +    log_notice(LD_CONFIG, "Your ContactInfo config option is not set. "
 +        "Please consider setting it, so we can contact you if your server is "
 +        "misconfigured or something else goes wrong.");
 +  const char *ContactInfo = options->ContactInfo;
 +  if (ContactInfo && !string_is_utf8(ContactInfo, strlen(ContactInfo)))
 +    REJECT("ContactInfo config option must be UTF-8.");
 +
 +  /* Special case on first boot if no Log options are given. */
 +  if (!options->Logs && !options->RunAsDaemon && !from_setconf) {
 +    if (quiet_level == 0)
 +      config_line_append(&options->Logs, "Log", "notice stdout");
 +    else if (quiet_level == 1)
 +      config_line_append(&options->Logs, "Log", "warn stdout");
 +  }
 +
 +  /* Validate the tor_log(s) */
 +  if (options_init_logs(old_options, options, 1)<0)
 +    REJECT("Failed to validate Log options. See logs for details.");
 +
 +  if (authdir_mode(options)) {
 +    /* confirm that our address isn't broken, so we can complain now */
 +    uint32_t tmp;
 +    if (resolve_my_address(LOG_WARN, options, &tmp, NULL, NULL) < 0)
 +      REJECT("Failed to resolve/guess local address. See logs for details.");
 +  }
 +
 +  if (server_mode(options) && options->RendConfigLines)
 +    log_warn(LD_CONFIG,
 +        "Tor is currently configured as a relay and a hidden service. "
 +        "That's not very secure: you should probably run your hidden service "
 +        "in a separate Tor process, at least -- see "
 +        "https://trac.torproject.org/8742";);
 +
 +  /* XXXX require that the only port not be DirPort? */
 +  /* XXXX require that at least one port be listened-upon. */
 +  if (n_ports == 0 && !options->RendConfigLines)
 +    log_warn(LD_CONFIG,
 +        "SocksPort, TransPort, NATDPort, DNSPort, and ORPort are all "
 +        "undefined, and there aren't any hidden services configured.  "
 +        "Tor will still run, but probably won't do anything.");
 +
 +  options->TransProxyType_parsed = TPT_DEFAULT;
 +#ifdef USE_TRANSPARENT
 +  if (options->TransProxyType) {
 +    if (!strcasecmp(options->TransProxyType, "default")) {
 +      options->TransProxyType_parsed = TPT_DEFAULT;
 +    } else if (!strcasecmp(options->TransProxyType, "pf-divert")) {
 +#if !defined(OpenBSD) && !defined( DARWIN )
 +      /* Later versions of OS X have pf */
 +      REJECT("pf-divert is a OpenBSD-specific "
 +             "and OS X/Darwin-specific feature.");
 +#else
 +      options->TransProxyType_parsed = TPT_PF_DIVERT;
 +#endif /* !defined(OpenBSD) && !defined( DARWIN ) */
 +    } else if (!strcasecmp(options->TransProxyType, "tproxy")) {
 +#if !defined(__linux__)
 +      REJECT("TPROXY is a Linux-specific feature.");
 +#else
 +      options->TransProxyType_parsed = TPT_TPROXY;
 +#endif
 +    } else if (!strcasecmp(options->TransProxyType, "ipfw")) {
 +#ifndef KERNEL_MAY_SUPPORT_IPFW
 +      /* Earlier versions of OS X have ipfw */
 +      REJECT("ipfw is a FreeBSD-specific "
 +             "and OS X/Darwin-specific feature.");
 +#else
 +      options->TransProxyType_parsed = TPT_IPFW;
 +#endif /* !defined(KERNEL_MAY_SUPPORT_IPFW) */
 +    } else {
 +      REJECT("Unrecognized value for TransProxyType");
 +    }
 +
 +    if (strcasecmp(options->TransProxyType, "default") &&
 +        !options->TransPort_set) {
 +      REJECT("Cannot use TransProxyType without any valid TransPort.");
 +    }
 +  }
 +#else /* !(defined(USE_TRANSPARENT)) */
 +  if (options->TransPort_set)
 +    REJECT("TransPort is disabled in this build.");
 +#endif /* defined(USE_TRANSPARENT) */
 +
 +  if (options->TokenBucketRefillInterval <= 0
 +      || options->TokenBucketRefillInterval > 1000) {
 +    REJECT("TokenBucketRefillInterval must be between 1 and 1000 inclusive.");
 +  }
 +
 +  if (options->ExcludeExitNodes || options->ExcludeNodes) {
 +    options->ExcludeExitNodesUnion_ = routerset_new();
 +    routerset_union(options->ExcludeExitNodesUnion_,options->ExcludeExitNodes);
 +    routerset_union(options->ExcludeExitNodesUnion_,options->ExcludeNodes);
 +  }
 +
 +  if (options->NodeFamilies) {
 +    options->NodeFamilySets = smartlist_new();
 +    for (cl = options->NodeFamilies; cl; cl = cl->next) {
 +      routerset_t *rs = routerset_new();
 +      if (routerset_parse(rs, cl->value, cl->key) == 0) {
 +        smartlist_add(options->NodeFamilySets, rs);
 +      } else {
 +        routerset_free(rs);
 +      }
 +    }
 +  }
 +
 +  if (options->ExcludeNodes && options->StrictNodes) {
 +    COMPLAIN("You have asked to exclude certain relays from all positions "
 +             "in your circuits. Expect hidden services and other Tor "
 +             "features to be broken in unpredictable ways.");
 +  }
 +
 +  for (cl = options->RecommendedPackages; cl; cl = cl->next) {
 +    if (! validate_recommended_package_line(cl->value)) {
 +      log_warn(LD_CONFIG, "Invalid RecommendedPackage line %s will be ignored",
 +               escaped(cl->value));
 +    }
 +  }
 +
 +  if (options->AuthoritativeDir) {
 +    if (!options->ContactInfo && !options->TestingTorNetwork)
 +      REJECT("Authoritative directory servers must set ContactInfo");
 +    if (!options->RecommendedClientVersions)
 +      options->RecommendedClientVersions =
 +        config_lines_dup(options->RecommendedVersions);
 +    if (!options->RecommendedServerVersions)
 +      options->RecommendedServerVersions =
 +        config_lines_dup(options->RecommendedVersions);
 +    if (options->VersioningAuthoritativeDir &&
 +        (!options->RecommendedClientVersions ||
 +         !options->RecommendedServerVersions))
 +      REJECT("Versioning authoritative dir servers must set "
 +             "Recommended*Versions.");
 +
 +#ifdef HAVE_MODULE_DIRAUTH
 +    char *t;
 +    /* Call these functions to produce warnings only. */
 +    t = format_recommended_version_list(options->RecommendedClientVersions, 1);
 +    tor_free(t);
 +    t = format_recommended_version_list(options->RecommendedServerVersions, 1);
 +    tor_free(t);
 +#endif
 +
 +    if (options->UseEntryGuards) {
 +      log_info(LD_CONFIG, "Authoritative directory servers can't set "
 +               "UseEntryGuards. Disabling.");
 +      options->UseEntryGuards = 0;
 +    }
 +    if (!options->DownloadExtraInfo && authdir_mode_v3(options)) {
 +      log_info(LD_CONFIG, "Authoritative directories always try to download "
 +               "extra-info documents. Setting DownloadExtraInfo.");
 +      options->DownloadExtraInfo = 1;
 +    }
 +    if (!(options->BridgeAuthoritativeDir ||
 +          options->V3AuthoritativeDir))
 +      REJECT("AuthoritativeDir is set, but none of "
 +             "(Bridge/V3)AuthoritativeDir is set.");
 +    /* If we have a v3bandwidthsfile and it's broken, complain on startup */
 +    if (options->V3BandwidthsFile && !old_options) {
 +      dirserv_read_measured_bandwidths(options->V3BandwidthsFile, NULL, NULL);
 +    }
 +    /* same for guardfraction file */
 +    if (options->GuardfractionFile && !old_options) {
 +      dirserv_read_guardfraction_file(options->GuardfractionFile, NULL);
 +    }
 +  }
 +
 +  if (options->AuthoritativeDir && !options->DirPort_set)
 +    REJECT("Running as authoritative directory, but no DirPort set.");
 +
 +  if (options->AuthoritativeDir && !options->ORPort_set)
 +    REJECT("Running as authoritative directory, but no ORPort set.");
 +
 +  if (options->AuthoritativeDir && options->ClientOnly)
 +    REJECT("Running as authoritative directory, but ClientOnly also set.");
 +
 +  if (options->FetchDirInfoExtraEarly && !options->FetchDirInfoEarly)
 +    REJECT("FetchDirInfoExtraEarly requires that you also set "
 +           "FetchDirInfoEarly");
 +
 +  if (options->ConnLimit <= 0) {
 +    tor_asprintf(msg,
 +        "ConnLimit must be greater than 0, but was set to %d",
 +        options->ConnLimit);
 +    return -1;
 +  }
 +
 +  if (options->PathsNeededToBuildCircuits >= 0.0) {
 +    if (options->PathsNeededToBuildCircuits < 0.25) {
 +      log_warn(LD_CONFIG, "PathsNeededToBuildCircuits is too low. Increasing "
 +               "to 0.25");
 +      options->PathsNeededToBuildCircuits = 0.25;
 +    } else if (options->PathsNeededToBuildCircuits > 0.95) {
 +      log_warn(LD_CONFIG, "PathsNeededToBuildCircuits is too high. Decreasing "
 +               "to 0.95");
 +      options->PathsNeededToBuildCircuits = 0.95;
 +    }
 +  }
 +
 +  if (options->MaxClientCircuitsPending <= 0 ||
 +      options->MaxClientCircuitsPending > MAX_MAX_CLIENT_CIRCUITS_PENDING) {
 +    tor_asprintf(msg,
 +                 "MaxClientCircuitsPending must be between 1 and %d, but "
 +                 "was set to %d", MAX_MAX_CLIENT_CIRCUITS_PENDING,
 +                 options->MaxClientCircuitsPending);
 +    return -1;
 +  }
 +
 +  if (validate_ports_csv(options->FirewallPorts, "FirewallPorts", msg) < 0)
 +    return -1;
 +
 +  if (validate_ports_csv(options->LongLivedPorts, "LongLivedPorts", msg) < 0)
 +    return -1;
 +
 +  if (validate_ports_csv(options->RejectPlaintextPorts,
 +                         "RejectPlaintextPorts", msg) < 0)
 +    return -1;
 +
 +  if (validate_ports_csv(options->WarnPlaintextPorts,
 +                         "WarnPlaintextPorts", msg) < 0)
 +    return -1;
 +
 +  if (options->FascistFirewall && !options->ReachableAddresses) {
 +    if (options->FirewallPorts && smartlist_len(options->FirewallPorts)) {
 +      /* We already have firewall ports set, so migrate them to
 +       * ReachableAddresses, which will set ReachableORAddresses and
 +       * ReachableDirAddresses if they aren't set explicitly. */
 +      smartlist_t *instead = smartlist_new();
 +      config_line_t *new_line = tor_malloc_zero(sizeof(config_line_t));
 +      new_line->key = tor_strdup("ReachableAddresses");
 +      /* If we're configured with the old format, we need to prepend some
 +       * open ports. */
 +      SMARTLIST_FOREACH(options->FirewallPorts, const char *, portno,
 +      {
 +        int p = atoi(portno);
 +        if (p<0) continue;
 +        smartlist_add_asprintf(instead, "*:%d", p);
 +      });
 +      new_line->value = smartlist_join_strings(instead,",",0,NULL);
 +      /* These have been deprecated since 0.1.1.5-alpha-cvs */
 +      log_notice(LD_CONFIG,
 +          "Converting FascistFirewall and FirewallPorts "
 +          "config options to new format: \"ReachableAddresses %s\"",
 +          new_line->value);
 +      options->ReachableAddresses = new_line;
 +      SMARTLIST_FOREACH(instead, char *, cp, tor_free(cp));
 +      smartlist_free(instead);
 +    } else {
 +      /* We do not have FirewallPorts set, so add 80 to
 +       * ReachableDirAddresses, and 443 to ReachableORAddresses. */
 +      if (!options->ReachableDirAddresses) {
 +        config_line_t *new_line = tor_malloc_zero(sizeof(config_line_t));
 +        new_line->key = tor_strdup("ReachableDirAddresses");
 +        new_line->value = tor_strdup("*:80");
 +        options->ReachableDirAddresses = new_line;
 +        log_notice(LD_CONFIG, "Converting FascistFirewall config option "
 +            "to new format: \"ReachableDirAddresses *:80\"");
 +      }
 +      if (!options->ReachableORAddresses) {
 +        config_line_t *new_line = tor_malloc_zero(sizeof(config_line_t));
 +        new_line->key = tor_strdup("ReachableORAddresses");
 +        new_line->value = tor_strdup("*:443");
 +        options->ReachableORAddresses = new_line;
 +        log_notice(LD_CONFIG, "Converting FascistFirewall config option "
 +            "to new format: \"ReachableORAddresses *:443\"");
 +      }
 +    }
 +  }
 +
 +  if ((options->ReachableAddresses ||
 +       options->ReachableORAddresses ||
 +       options->ReachableDirAddresses ||
 +       options->ClientUseIPv4 == 0) &&
 +      server_mode(options))
 +    REJECT("Servers must be able to freely connect to the rest "
 +           "of the Internet, so they must not set Reachable*Addresses "
 +           "or FascistFirewall or FirewallPorts or ClientUseIPv4 0.");
 +
 +  if (options->UseBridges &&
 +      server_mode(options))
 +    REJECT("Servers must be able to freely connect to the rest "
 +           "of the Internet, so they must not set UseBridges.");
 +
 +  /* If both of these are set, we'll end up with funny behavior where we
 +   * demand enough entrynodes be up and running else we won't build
 +   * circuits, yet we never actually use them. */
 +  if (options->UseBridges && options->EntryNodes)
 +    REJECT("You cannot set both UseBridges and EntryNodes.");
 +
 +  /* If we have UseBridges as 1 and UseEntryGuards as 0, we end up bypassing
 +   * the use of bridges */
 +  if (options->UseBridges && !options->UseEntryGuards)
 +    REJECT("Setting UseBridges requires also setting UseEntryGuards.");
 +
 +  options->MaxMemInQueues =
 +    compute_real_max_mem_in_queues(options->MaxMemInQueues_raw,
 +                                   server_mode(options));
 +  options->MaxMemInQueues_low_threshold = (options->MaxMemInQueues / 4) * 3;
 +
 +  if (!options->SafeLogging ||
 +      !strcasecmp(options->SafeLogging, "0")) {
 +    options->SafeLogging_ = SAFELOG_SCRUB_NONE;
 +  } else if (!strcasecmp(options->SafeLogging, "relay")) {
 +    options->SafeLogging_ = SAFELOG_SCRUB_RELAY;
 +  } else if (!strcasecmp(options->SafeLogging, "1")) {
 +    options->SafeLogging_ = SAFELOG_SCRUB_ALL;
 +  } else {
 +    tor_asprintf(msg,
 +                     "Unrecognized value '%s' in SafeLogging",
 +                     escaped(options->SafeLogging));
 +    return -1;
 +  }
 +
 +  if (compute_publishserverdescriptor(options) < 0) {
 +    tor_asprintf(msg, "Unrecognized value in PublishServerDescriptor");
 +    return -1;
 +  }
 +
 +  if ((options->BridgeRelay
 +        || options->PublishServerDescriptor_ & BRIDGE_DIRINFO)
 +      && (options->PublishServerDescriptor_ & V3_DIRINFO)) {
 +    REJECT("Bridges are not supposed to publish router descriptors to the "
 +           "directory authorities. Please correct your "
 +           "PublishServerDescriptor line.");
 +  }
 +
 +  if (options->BridgeRelay && options->DirPort_set) {
 +    log_warn(LD_CONFIG, "Can't set a DirPort on a bridge relay; disabling "
 +             "DirPort");
 +    config_free_lines(options->DirPort_lines);
 +    options->DirPort_lines = NULL;
 +    options->DirPort_set = 0;
 +  }
 +
 +  if (server_mode(options) && options->ConnectionPadding != -1) {
 +    REJECT("Relays must use 'auto' for the ConnectionPadding setting.");
 +  }
 +
 +  if (server_mode(options) && options->ReducedConnectionPadding != 0) {
 +    REJECT("Relays cannot set ReducedConnectionPadding. ");
 +  }
 +
 +  if (options->BridgeDistribution) {
 +    if (!options->BridgeRelay) {
 +      REJECT("You set BridgeDistribution, but you didn't set BridgeRelay!");
 +    }
 +    if (check_bridge_distribution_setting(options->BridgeDistribution) < 0) {
 +      REJECT("Invalid BridgeDistribution value.");
 +    }
 +  }
 +
 +  if (options->MinUptimeHidServDirectoryV2 < 0) {
 +    log_warn(LD_CONFIG, "MinUptimeHidServDirectoryV2 option must be at "
 +                        "least 0 seconds. Changing to 0.");
 +    options->MinUptimeHidServDirectoryV2 = 0;
 +  }
 +
 +  const int min_rendpostperiod =
 +    options->TestingTorNetwork ?
 +    MIN_REND_POST_PERIOD_TESTING : MIN_REND_POST_PERIOD;
 +  if (options->RendPostPeriod < min_rendpostperiod) {
 +    log_warn(LD_CONFIG, "RendPostPeriod option is too short; "
 +             "raising to %d seconds.", min_rendpostperiod);
 +    options->RendPostPeriod = min_rendpostperiod;
 +  }
 +
 +  if (options->RendPostPeriod > MAX_DIR_PERIOD) {
 +    log_warn(LD_CONFIG, "RendPostPeriod is too large; clipping to %ds.",
 +             MAX_DIR_PERIOD);
 +    options->RendPostPeriod = MAX_DIR_PERIOD;
 +  }
 +
 +  /* Check the Single Onion Service options */
 +  if (options_validate_single_onion(options, msg) < 0)
 +    return -1;
 +
 +  if (options->CircuitsAvailableTimeout > MAX_CIRCS_AVAILABLE_TIME) {
 +    // options_t is immutable for new code (the above code is older),
 +    // so just make the user fix the value themselves rather than
 +    // silently keep a shadow value lower than what they asked for.
 +    REJECT("CircuitsAvailableTimeout is too large. Max is 24 hours.");
 +  }
 +
 +  if (options->EntryNodes && !options->UseEntryGuards) {
 +    REJECT("If EntryNodes is set, UseEntryGuards must be enabled.");
 +  }
 +
 +  if (!(options->UseEntryGuards) &&
 +      (options->RendConfigLines != NULL) &&
 +      !rend_service_allow_non_anonymous_connection(options)) {
 +    log_warn(LD_CONFIG,
 +             "UseEntryGuards is disabled, but you have configured one or more "
 +             "hidden services on this Tor instance.  Your hidden services "
 +             "will be very easy to locate using a well-known attack -- see "
 +             "http://freehaven.net/anonbib/#hs-attack06 for details.");
 +  }
 +
 +  if (options->NumPrimaryGuards && options->NumEntryGuards &&
 +      options->NumEntryGuards > options->NumPrimaryGuards) {
 +    REJECT("NumEntryGuards must not be greater than NumPrimaryGuards.");
 +  }
 +
 +  if (options->EntryNodes &&
 +      routerset_is_list(options->EntryNodes) &&
 +      (routerset_len(options->EntryNodes) == 1) &&
 +      (options->RendConfigLines != NULL)) {
 +    tor_asprintf(msg,
 +             "You have one single EntryNodes and at least one hidden service "
 +             "configured. This is bad because it's very easy to locate your "
 +             "entry guard which can then lead to the deanonymization of your "
 +             "hidden service -- for more details, see "
 +             "https://trac.torproject.org/projects/tor/ticket/14917. "
 +             "For this reason, the use of one EntryNodes with an hidden "
 +             "service is prohibited until a better solution is found.");
 +    return -1;
 +  }
 +
 +  /* Inform the hidden service operator that pinning EntryNodes can possibly
 +   * be harmful for the service anonymity. */
 +  if (options->EntryNodes &&
 +      routerset_is_list(options->EntryNodes) &&
 +      (options->RendConfigLines != NULL)) {
 +    log_warn(LD_CONFIG,
 +             "EntryNodes is set with multiple entries and at least one "
 +             "hidden service is configured. Pinning entry nodes can possibly "
 +             "be harmful to the service anonymity. Because of this, we "
 +             "recommend you either don't do that or make sure you know what "
 +             "you are doing. For more details, please look at "
 +             "https://trac.torproject.org/projects/tor/ticket/21155.";);
 +  }
 +
 +  /* Single Onion Services: non-anonymous hidden services */
 +  if (rend_service_non_anonymous_mode_enabled(options)) {
 +    log_warn(LD_CONFIG,
 +             "HiddenServiceNonAnonymousMode is set. Every hidden service on "
 +             "this tor instance is NON-ANONYMOUS. If "
 +             "the HiddenServiceNonAnonymousMode option is changed, Tor will "
 +             "refuse to launch hidden services from the same directories, to "
 +             "protect your anonymity against config errors. This setting is "
 +             "for experimental use only.");
 +  }
 +
 +  if (!options->LearnCircuitBuildTimeout && options->CircuitBuildTimeout &&
 +      options->CircuitBuildTimeout < RECOMMENDED_MIN_CIRCUIT_BUILD_TIMEOUT) {
 +    log_warn(LD_CONFIG,
 +        "CircuitBuildTimeout is shorter (%d seconds) than the recommended "
 +        "minimum (%d seconds), and LearnCircuitBuildTimeout is disabled.  "
 +        "If tor isn't working, raise this value or enable "
 +        "LearnCircuitBuildTimeout.",
 +        options->CircuitBuildTimeout,
 +        RECOMMENDED_MIN_CIRCUIT_BUILD_TIMEOUT );
 +  } else if (!options->LearnCircuitBuildTimeout &&
 +             !options->CircuitBuildTimeout) {
 +    int severity = LOG_NOTICE;
 +    /* Be a little quieter if we've deliberately disabled
 +     * LearnCircuitBuildTimeout. */
 +    if (circuit_build_times_disabled_(options, 1)) {
 +      severity = LOG_INFO;
 +    }
 +    log_fn(severity, LD_CONFIG, "You disabled LearnCircuitBuildTimeout, but "
 +           "didn't specify a CircuitBuildTimeout. I'll pick a plausible "
 +           "default.");
 +  }
 +
 +  if (options->PathBiasNoticeRate > 1.0) {
 +    tor_asprintf(msg,
 +              "PathBiasNoticeRate is too high. "
 +              "It must be between 0 and 1.0");
 +    return -1;
 +  }
 +  if (options->PathBiasWarnRate > 1.0) {
 +    tor_asprintf(msg,
 +              "PathBiasWarnRate is too high. "
 +              "It must be between 0 and 1.0");
 +    return -1;
 +  }
 +  if (options->PathBiasExtremeRate > 1.0) {
 +    tor_asprintf(msg,
 +              "PathBiasExtremeRate is too high. "
 +              "It must be between 0 and 1.0");
 +    return -1;
 +  }
 +  if (options->PathBiasNoticeUseRate > 1.0) {
 +    tor_asprintf(msg,
 +              "PathBiasNoticeUseRate is too high. "
 +              "It must be between 0 and 1.0");
 +    return -1;
 +  }
 +  if (options->PathBiasExtremeUseRate > 1.0) {
 +    tor_asprintf(msg,
 +              "PathBiasExtremeUseRate is too high. "
 +              "It must be between 0 and 1.0");
 +    return -1;
 +  }
 +
 +  if (options->MaxCircuitDirtiness < MIN_MAX_CIRCUIT_DIRTINESS) {
 +    log_warn(LD_CONFIG, "MaxCircuitDirtiness option is too short; "
 +             "raising to %d seconds.", MIN_MAX_CIRCUIT_DIRTINESS);
 +    options->MaxCircuitDirtiness = MIN_MAX_CIRCUIT_DIRTINESS;
 +  }
 +
 +  if (options->MaxCircuitDirtiness > MAX_MAX_CIRCUIT_DIRTINESS) {
 +    log_warn(LD_CONFIG, "MaxCircuitDirtiness option is too high; "
 +             "setting to %d days.", MAX_MAX_CIRCUIT_DIRTINESS/86400);
 +    options->MaxCircuitDirtiness = MAX_MAX_CIRCUIT_DIRTINESS;
 +  }
 +
 +  if (options->CircuitStreamTimeout &&
 +      options->CircuitStreamTimeout < MIN_CIRCUIT_STREAM_TIMEOUT) {
 +    log_warn(LD_CONFIG, "CircuitStreamTimeout option is too short; "
 +             "raising to %d seconds.", MIN_CIRCUIT_STREAM_TIMEOUT);
 +    options->CircuitStreamTimeout = MIN_CIRCUIT_STREAM_TIMEOUT;
 +  }
 +
 +  if (options->HeartbeatPeriod &&
 +      options->HeartbeatPeriod < MIN_HEARTBEAT_PERIOD) {
 +    log_warn(LD_CONFIG, "HeartbeatPeriod option is too short; "
 +             "raising to %d seconds.", MIN_HEARTBEAT_PERIOD);
 +    options->HeartbeatPeriod = MIN_HEARTBEAT_PERIOD;
 +  }
 +
 +  if (options->KeepalivePeriod < 1)
 +    REJECT("KeepalivePeriod option must be positive.");
 +
 +  if (ensure_bandwidth_cap(&options->BandwidthRate,
 +                           "BandwidthRate", msg) < 0)
 +    return -1;
 +  if (ensure_bandwidth_cap(&options->BandwidthBurst,
 +                           "BandwidthBurst", msg) < 0)
 +    return -1;
 +  if (ensure_bandwidth_cap(&options->MaxAdvertisedBandwidth,
 +                           "MaxAdvertisedBandwidth", msg) < 0)
 +    return -1;
 +  if (ensure_bandwidth_cap(&options->RelayBandwidthRate,
 +                           "RelayBandwidthRate", msg) < 0)
 +    return -1;
 +  if (ensure_bandwidth_cap(&options->RelayBandwidthBurst,
 +                           "RelayBandwidthBurst", msg) < 0)
 +    return -1;
 +  if (ensure_bandwidth_cap(&options->PerConnBWRate,
 +                           "PerConnBWRate", msg) < 0)
 +    return -1;
 +  if (ensure_bandwidth_cap(&options->PerConnBWBurst,
 +                           "PerConnBWBurst", msg) < 0)
 +    return -1;
 +  if (ensure_bandwidth_cap(&options->AuthDirFastGuarantee,
 +                           "AuthDirFastGuarantee", msg) < 0)
 +    return -1;
 +  if (ensure_bandwidth_cap(&options->AuthDirGuardBWGuarantee,
 +                           "AuthDirGuardBWGuarantee", msg) < 0)
 +    return -1;
 +
 +  if (options->RelayBandwidthRate && !options->RelayBandwidthBurst)
 +    options->RelayBandwidthBurst = options->RelayBandwidthRate;
 +  if (options->RelayBandwidthBurst && !options->RelayBandwidthRate)
 +    options->RelayBandwidthRate = options->RelayBandwidthBurst;
 +
 +  if (server_mode(options)) {
 +    const unsigned required_min_bw =
 +      public_server_mode(options) ?
 +       RELAY_REQUIRED_MIN_BANDWIDTH : BRIDGE_REQUIRED_MIN_BANDWIDTH;
 +    const char * const optbridge =
 +      public_server_mode(options) ? "" : "bridge ";
 +    if (options->BandwidthRate < required_min_bw) {
 +      tor_asprintf(msg,
 +                       "BandwidthRate is set to %d bytes/second. "
 +                       "For %sservers, it must be at least %u.",
 +                       (int)options->BandwidthRate, optbridge,
 +                       required_min_bw);
 +      return -1;
 +    } else if (options->MaxAdvertisedBandwidth <
 +               required_min_bw/2) {
 +      tor_asprintf(msg,
 +                       "MaxAdvertisedBandwidth is set to %d bytes/second. "
 +                       "For %sservers, it must be at least %u.",
 +                       (int)options->MaxAdvertisedBandwidth, optbridge,
 +                       required_min_bw/2);
 +      return -1;
 +    }
 +    if (options->RelayBandwidthRate &&
 +      options->RelayBandwidthRate < required_min_bw) {
 +      tor_asprintf(msg,
 +                       "RelayBandwidthRate is set to %d bytes/second. "
 +                       "For %sservers, it must be at least %u.",
 +                       (int)options->RelayBandwidthRate, optbridge,
 +                       required_min_bw);
 +      return -1;
 +    }
 +  }
 +
 +  if (options->RelayBandwidthRate > options->RelayBandwidthBurst)
 +    REJECT("RelayBandwidthBurst must be at least equal "
 +           "to RelayBandwidthRate.");
 +
 +  if (options->BandwidthRate > options->BandwidthBurst)
 +    REJECT("BandwidthBurst must be at least equal to BandwidthRate.");
 +
 +  /* if they set relaybandwidth* really high but left bandwidth*
 +   * at the default, raise the defaults. */
 +  if (options->RelayBandwidthRate > options->BandwidthRate)
 +    options->BandwidthRate = options->RelayBandwidthRate;
 +  if (options->RelayBandwidthBurst > options->BandwidthBurst)
 +    options->BandwidthBurst = options->RelayBandwidthBurst;
 +
 +  if (accounting_parse_options(options, 1)<0)
 +    REJECT("Failed to parse accounting options. See logs for details.");
 +
 +  if (options->AccountingMax) {
 +    if (options->RendConfigLines && server_mode(options)) {
 +      log_warn(LD_CONFIG, "Using accounting with a hidden service and an "
 +               "ORPort is risky: your hidden service(s) and your public "
 +               "address will all turn off at the same time, which may alert "
 +               "observers that they are being run by the same party.");
 +    } else if (config_count_key(options->RendConfigLines,
 +                                "HiddenServiceDir") > 1) {
 +      log_warn(LD_CONFIG, "Using accounting with multiple hidden services is "
 +               "risky: they will all turn off at the same time, which may "
 +               "alert observers that they are being run by the same party.");
 +    }
 +  }
 +
 +  options->AccountingRule = ACCT_MAX;
 +  if (options->AccountingRule_option) {
 +    if (!strcmp(options->AccountingRule_option, "sum"))
 +      options->AccountingRule = ACCT_SUM;
 +    else if (!strcmp(options->AccountingRule_option, "max"))
 +      options->AccountingRule = ACCT_MAX;
 +    else if (!strcmp(options->AccountingRule_option, "in"))
 +      options->AccountingRule = ACCT_IN;
 +    else if (!strcmp(options->AccountingRule_option, "out"))
 +      options->AccountingRule = ACCT_OUT;
 +    else
 +      REJECT("AccountingRule must be 'sum', 'max', 'in', or 'out'");
 +  }
 +
 +  if (options->DirPort_set && !options->DirCache) {
 +    REJECT("DirPort configured but DirCache disabled. DirPort requires "
 +           "DirCache.");
 +  }
 +
 +  if (options->BridgeRelay && !options->DirCache) {
 +    REJECT("We're a bridge but DirCache is disabled. BridgeRelay requires "
 +           "DirCache.");
 +  }
 +
 +  if (server_mode(options)) {
 +    char *dircache_msg = NULL;
 +    if (have_enough_mem_for_dircache(options, 0, &dircache_msg)) {
 +      log_warn(LD_CONFIG, "%s", dircache_msg);
 +      tor_free(dircache_msg);
 +    }
 +  }
 +
 +  if (options->HTTPProxy) { /* parse it now */
 +    if (tor_addr_port_lookup(options->HTTPProxy,
 +                        &options->HTTPProxyAddr, &options->HTTPProxyPort) < 0)
 +      REJECT("HTTPProxy failed to parse or resolve. Please fix.");
 +    if (options->HTTPProxyPort == 0) { /* give it a default */
 +      options->HTTPProxyPort = 80;
 +    }
 +  }
 +
 +  if (options->HTTPProxyAuthenticator) {
 +    if (strlen(options->HTTPProxyAuthenticator) >= 512)
 +      REJECT("HTTPProxyAuthenticator is too long (>= 512 chars).");
 +  }
 +
 +  if (options->HTTPSProxy) { /* parse it now */
 +    if (tor_addr_port_lookup(options->HTTPSProxy,
 +                        &options->HTTPSProxyAddr, &options->HTTPSProxyPort) <0)
 +      REJECT("HTTPSProxy failed to parse or resolve. Please fix.");
 +    if (options->HTTPSProxyPort == 0) { /* give it a default */
 +      options->HTTPSProxyPort = 443;
 +    }
 +  }
 +
 +  if (options->HTTPSProxyAuthenticator) {
 +    if (strlen(options->HTTPSProxyAuthenticator) >= 512)
 +      REJECT("HTTPSProxyAuthenticator is too long (>= 512 chars).");
 +  }
 +
 +  if (options->Socks4Proxy) { /* parse it now */
 +    if (tor_addr_port_lookup(options->Socks4Proxy,
 +                        &options->Socks4ProxyAddr,
 +                        &options->Socks4ProxyPort) <0)
 +      REJECT("Socks4Proxy failed to parse or resolve. Please fix.");
 +    if (options->Socks4ProxyPort == 0) { /* give it a default */
 +      options->Socks4ProxyPort = 1080;
 +    }
 +  }
 +
 +  if (options->Socks5Proxy) { /* parse it now */
 +    if (tor_addr_port_lookup(options->Socks5Proxy,
 +                            &options->Socks5ProxyAddr,
 +                            &options->Socks5ProxyPort) <0)
 +      REJECT("Socks5Proxy failed to parse or resolve. Please fix.");
 +    if (options->Socks5ProxyPort == 0) { /* give it a default */
 +      options->Socks5ProxyPort = 1080;
 +    }
 +  }
 +
 +  /* Check if more than one exclusive proxy type has been enabled. */
 +  if (!!options->Socks4Proxy + !!options->Socks5Proxy +
 +      !!options->HTTPSProxy > 1)
 +    REJECT("You have configured more than one proxy type. "
 +           "(Socks4Proxy|Socks5Proxy|HTTPSProxy)");
 +
 +  /* Check if the proxies will give surprising behavior. */
 +  if (options->HTTPProxy && !(options->Socks4Proxy ||
 +                              options->Socks5Proxy ||
 +                              options->HTTPSProxy)) {
 +    log_warn(LD_CONFIG, "HTTPProxy configured, but no SOCKS proxy or "
 +             "HTTPS proxy configured. Watch out: this configuration will "
 +             "proxy unencrypted directory connections only.");
 +  }
 +
 +  if (options->Socks5ProxyUsername) {
 +    size_t len;
 +
 +    len = strlen(options->Socks5ProxyUsername);
 +    if (len < 1 || len > MAX_SOCKS5_AUTH_FIELD_SIZE)
 +      REJECT("Socks5ProxyUsername must be between 1 and 255 characters.");
 +
 +    if (!options->Socks5ProxyPassword)
 +      REJECT("Socks5ProxyPassword must be included with Socks5ProxyUsername.");
 +
 +    len = strlen(options->Socks5ProxyPassword);
 +    if (len < 1 || len > MAX_SOCKS5_AUTH_FIELD_SIZE)
 +      REJECT("Socks5ProxyPassword must be between 1 and 255 characters.");
 +  } else if (options->Socks5ProxyPassword)
 +    REJECT("Socks5ProxyPassword must be included with Socks5ProxyUsername.");
 +
 +  if (options->HashedControlPassword) {
 +    smartlist_t *sl = decode_hashed_passwords(options->HashedControlPassword);
 +    if (!sl) {
 +      REJECT("Bad HashedControlPassword: wrong length or bad encoding");
 +    } else {
 +      SMARTLIST_FOREACH(sl, char*, cp, tor_free(cp));
 +      smartlist_free(sl);
 +    }
 +  }
 +
 +  if (options->HashedControlSessionPassword) {
 +    smartlist_t *sl = decode_hashed_passwords(
 +                                  options->HashedControlSessionPassword);
 +    if (!sl) {
 +      REJECT("Bad HashedControlSessionPassword: wrong length or bad encoding");
 +    } else {
 +      SMARTLIST_FOREACH(sl, char*, cp, tor_free(cp));
 +      smartlist_free(sl);
 +    }
 +  }
 +
 +  if (options->OwningControllerProcess) {
 +    const char *validate_pspec_msg = NULL;
 +    if (tor_validate_process_specifier(options->OwningControllerProcess,
 +                                       &validate_pspec_msg)) {
 +      tor_asprintf(msg, "Bad OwningControllerProcess: %s",
 +                   validate_pspec_msg);
 +      return -1;
 +    }
 +  }
 +
 +  if ((options->ControlPort_set || world_writable_control_socket) &&
 +      !options->HashedControlPassword &&
 +      !options->HashedControlSessionPassword &&
 +      !options->CookieAuthentication) {
 +    log_warn(LD_CONFIG, "Control%s is %s, but no authentication method "
 +             "has been configured.  This means that any program on your "
 +             "computer can reconfigure your Tor.  That's bad!  You should "
 +             "upgrade your Tor controller as soon as possible.",
 +             options->ControlPort_set ? "Port" : "Socket",
 +             options->ControlPort_set ? "open" : "world writable");
 +  }
 +
 +  if (options->CookieAuthFileGroupReadable && !options->CookieAuthFile) {
 +    log_warn(LD_CONFIG, "CookieAuthFileGroupReadable is set, but will have "
 +             "no effect: you must specify an explicit CookieAuthFile to "
 +             "have it group-readable.");
 +  }
 +
 +  if (options->MyFamily_lines && options->BridgeRelay) {
 +    log_warn(LD_CONFIG, "Listing a family for a bridge relay is not "
 +             "supported: it can reveal bridge fingerprints to censors. "
 +             "You should also make sure you aren't listing this bridge's "
 +             "fingerprint in any other MyFamily.");
 +  }
 +  if (normalize_nickname_list(&options->MyFamily,
 +                              options->MyFamily_lines, "MyFamily", msg))
 +    return -1;
 +  for (cl = options->NodeFamilies; cl; cl = cl->next) {
 +    routerset_t *rs = routerset_new();
 +    if (routerset_parse(rs, cl->value, cl->key)) {
 +      routerset_free(rs);
 +      return -1;
 +    }
 +    routerset_free(rs);
 +  }
 +
 +  if (validate_addr_policies(options, msg) < 0)
 +    return -1;
 +
 +  /* If FallbackDir is set, we don't UseDefaultFallbackDirs */
 +  if (options->UseDefaultFallbackDirs && options->FallbackDir) {
 +    log_info(LD_CONFIG, "You have set UseDefaultFallbackDirs 1 and "
 +             "FallbackDir(s). Ignoring UseDefaultFallbackDirs, and "
 +             "using the FallbackDir(s) you have set.");
 +  }
 +
 +  if (validate_dir_servers(options, old_options) < 0)
 +    REJECT("Directory authority/fallback line did not parse. See logs "
 +           "for details.");
 +
 +  if (options->UseBridges && !options->Bridges)
 +    REJECT("If you set UseBridges, you must specify at least one bridge.");
 +
 +  for (cl = options->Bridges; cl; cl = cl->next) {
 +      bridge_line_t *bridge_line = parse_bridge_line(cl->value);
 +      if (!bridge_line)
 +        REJECT("Bridge line did not parse. See logs for details.");
 +      bridge_line_free(bridge_line);
 +  }
 +
 +  for (cl = options->ClientTransportPlugin; cl; cl = cl->next) {
 +    if (parse_transport_line(options, cl->value, 1, 0) < 0)
 +      REJECT("Invalid client transport line. See logs for details.");
 +  }
 +
 +  for (cl = options->ServerTransportPlugin; cl; cl = cl->next) {
 +    if (parse_transport_line(options, cl->value, 1, 1) < 0)
 +      REJECT("Invalid server transport line. See logs for details.");
 +  }
 +
 +  if (options->ServerTransportPlugin && !server_mode(options)) {
 +    log_notice(LD_GENERAL, "Tor is not configured as a relay but you specified"
 +               " a ServerTransportPlugin line (%s). The ServerTransportPlugin "
 +               "line will be ignored.",
 +               escaped(options->ServerTransportPlugin->value));
 +  }
 +
 +  for (cl = options->ServerTransportListenAddr; cl; cl = cl->next) {
 +    /** If get_bindaddr_from_transport_listen_line() fails with
 +        'transport' being NULL, it means that something went wrong
 +        while parsing the ServerTransportListenAddr line. */
 +    char *bindaddr = get_bindaddr_from_transport_listen_line(cl->value, NULL);
 +    if (!bindaddr)
 +      REJECT("ServerTransportListenAddr did not parse. See logs for details.");
 +    tor_free(bindaddr);
 +  }
 +
 +  if (options->ServerTransportListenAddr && !options->ServerTransportPlugin) {
 +    log_notice(LD_GENERAL, "You need at least a single managed-proxy to "
 +               "specify a transport listen address. The "
 +               "ServerTransportListenAddr line will be ignored.");
 +  }
 +
 +  for (cl = options->ServerTransportOptions; cl; cl = cl->next) {
 +    /** If get_options_from_transport_options_line() fails with
 +        'transport' being NULL, it means that something went wrong
 +        while parsing the ServerTransportOptions line. */
 +    smartlist_t *options_sl =
 +      get_options_from_transport_options_line(cl->value, NULL);
 +    if (!options_sl)
 +      REJECT("ServerTransportOptions did not parse. See logs for details.");
 +
 +    SMARTLIST_FOREACH(options_sl, char *, cp, tor_free(cp));
 +    smartlist_free(options_sl);
 +  }
 +
 +  if (options->ConstrainedSockets) {
 +    /* If the user wants to constrain socket buffer use, make sure the desired
 +     * limit is between MIN|MAX_TCPSOCK_BUFFER in k increments. */
 +    if (options->ConstrainedSockSize < MIN_CONSTRAINED_TCP_BUFFER ||
 +        options->ConstrainedSockSize > MAX_CONSTRAINED_TCP_BUFFER ||
 +        options->ConstrainedSockSize % 1024) {
 +      tor_asprintf(msg,
 +          "ConstrainedSockSize is invalid.  Must be a value between %d and %d "
 +          "in 1024 byte increments.",
 +          MIN_CONSTRAINED_TCP_BUFFER, MAX_CONSTRAINED_TCP_BUFFER);
 +      return -1;
 +    }
 +    if (options->DirPort_set) {
 +      /* Providing cached directory entries while system TCP buffers are scarce
 +       * will exacerbate the socket errors.  Suggest that this be disabled. */
 +      COMPLAIN("You have requested constrained socket buffers while also "
 +               "serving directory entries via DirPort.  It is strongly "
 +               "suggested that you disable serving directory requests when "
 +               "system TCP buffer resources are scarce.");
 +    }
 +  }
 +
 +  if (options->V3AuthVoteDelay + options->V3AuthDistDelay >=
 +      options->V3AuthVotingInterval/2) {
 +    /*
 +    This doesn't work, but it seems like it should:
 +     what code is preventing the interval being less than twice the lead-up?
 +    if (options->TestingTorNetwork) {
 +      if (options->V3AuthVoteDelay + options->V3AuthDistDelay >=
 +          options->V3AuthVotingInterval) {
 +        REJECT("V3AuthVoteDelay plus V3AuthDistDelay must be less than "
 +               "V3AuthVotingInterval");
 +      } else {
 +        COMPLAIN("V3AuthVoteDelay plus V3AuthDistDelay is more than half "
 +                 "V3AuthVotingInterval. This may lead to "
 +                 "consensus instability, particularly if clocks drift.");
 +      }
 +    } else {
 +     */
 +      REJECT("V3AuthVoteDelay plus V3AuthDistDelay must be less than half "
 +             "V3AuthVotingInterval");
 +    /*
 +    }
 +     */
 +  }
 +
 +  if (options->V3AuthVoteDelay < MIN_VOTE_SECONDS) {
 +    if (options->TestingTorNetwork) {
 +      if (options->V3AuthVoteDelay < MIN_VOTE_SECONDS_TESTING) {
 +        REJECT("V3AuthVoteDelay is way too low.");
 +      } else {
 +        COMPLAIN("V3AuthVoteDelay is very low. "
 +                 "This may lead to failure to vote for a consensus.");
 +      }
 +    } else {
 +      REJECT("V3AuthVoteDelay is way too low.");
 +    }
 +  }
 +
 +  if (options->V3AuthDistDelay < MIN_DIST_SECONDS) {
 +    if (options->TestingTorNetwork) {
 +      if (options->V3AuthDistDelay < MIN_DIST_SECONDS_TESTING) {
 +        REJECT("V3AuthDistDelay is way too low.");
 +      } else {
 +        COMPLAIN("V3AuthDistDelay is very low. "
 +                 "This may lead to missing votes in a consensus.");
 +      }
 +    } else {
 +      REJECT("V3AuthDistDelay is way too low.");
 +    }
 +  }
 +
 +  if (options->V3AuthNIntervalsValid < 2)
 +    REJECT("V3AuthNIntervalsValid must be at least 2.");
 +
 +  if (options->V3AuthVotingInterval < MIN_VOTE_INTERVAL) {
 +    if (options->TestingTorNetwork) {
 +      if (options->V3AuthVotingInterval < MIN_VOTE_INTERVAL_TESTING) {
 +        REJECT("V3AuthVotingInterval is insanely low.");
 +      } else {
 +        COMPLAIN("V3AuthVotingInterval is very low. "
 +                 "This may lead to failure to synchronise for a consensus.");
 +      }
 +    } else {
 +      REJECT("V3AuthVotingInterval is insanely low.");
 +    }
 +  } else if (options->V3AuthVotingInterval > 24*60*60) {
 +    REJECT("V3AuthVotingInterval is insanely high.");
 +  } else if (((24*60*60) % options->V3AuthVotingInterval) != 0) {
 +    COMPLAIN("V3AuthVotingInterval does not divide evenly into 24 hours.");
 +  }
 +
 +  if (hs_config_service_all(options, 1) < 0)
 +    REJECT("Failed to configure rendezvous options. See logs for details.");
 +
 +  /* Parse client-side authorization for hidden services. */
 +  if (hs_config_client_auth_all(options, 1) < 0)
 +    REJECT("Failed to configure client authorization for hidden services. "
 +           "See logs for details.");
 +
 +  if (parse_virtual_addr_network(options->VirtualAddrNetworkIPv4,
 +                                 AF_INET, 1, msg)<0)
 +    return -1;
 +  if (parse_virtual_addr_network(options->VirtualAddrNetworkIPv6,
 +                                 AF_INET6, 1, msg)<0)
 +    return -1;
 +
 +  if (options->TestingTorNetwork &&
 +      !(options->DirAuthorities ||
 +        (options->AlternateDirAuthority &&
 +         options->AlternateBridgeAuthority))) {
 +    REJECT("TestingTorNetwork may only be configured in combination with "
 +           "a non-default set of DirAuthority or both of "
 +           "AlternateDirAuthority and AlternateBridgeAuthority configured.");
 +  }
 +
 +#define CHECK_DEFAULT(arg)                                              \
 +  STMT_BEGIN                                                            \
 +    if (!options->TestingTorNetwork &&                                  \
 +        !options->UsingTestNetworkDefaults_ &&                          \
 +        !config_is_same(&options_format,options,                        \
 +                        default_options,#arg)) {                        \
 +      REJECT(#arg " may only be changed in testing Tor "                \
 +             "networks!");                                              \
 +    } STMT_END
 +  CHECK_DEFAULT(TestingV3AuthInitialVotingInterval);
 +  CHECK_DEFAULT(TestingV3AuthInitialVoteDelay);
 +  CHECK_DEFAULT(TestingV3AuthInitialDistDelay);
 +  CHECK_DEFAULT(TestingV3AuthVotingStartOffset);
 +  CHECK_DEFAULT(TestingAuthDirTimeToLearnReachability);
 +  CHECK_DEFAULT(TestingEstimatedDescriptorPropagationTime);
 +  CHECK_DEFAULT(TestingServerDownloadInitialDelay);
 +  CHECK_DEFAULT(TestingClientDownloadInitialDelay);
 +  CHECK_DEFAULT(TestingServerConsensusDownloadInitialDelay);
 +  CHECK_DEFAULT(TestingClientConsensusDownloadInitialDelay);
 +  CHECK_DEFAULT(TestingBridgeDownloadInitialDelay);
 +  CHECK_DEFAULT(TestingBridgeBootstrapDownloadInitialDelay);
 +  CHECK_DEFAULT(TestingClientMaxIntervalWithoutRequest);
 +  CHECK_DEFAULT(TestingDirConnectionMaxStall);
 +  CHECK_DEFAULT(TestingAuthKeyLifetime);
 +  CHECK_DEFAULT(TestingLinkCertLifetime);
 +  CHECK_DEFAULT(TestingSigningKeySlop);
 +  CHECK_DEFAULT(TestingAuthKeySlop);
 +  CHECK_DEFAULT(TestingLinkKeySlop);
 +#undef CHECK_DEFAULT
 +
 +  if (!options->ClientDNSRejectInternalAddresses &&
 +      !(options->DirAuthorities ||
 +        (options->AlternateDirAuthority && options->AlternateBridgeAuthority)))
 +    REJECT("ClientDNSRejectInternalAddresses used for default network.");
 +  if (options->SigningKeyLifetime < options->TestingSigningKeySlop*2)
 +    REJECT("SigningKeyLifetime is too short.");
 +  if (options->TestingLinkCertLifetime < options->TestingAuthKeySlop*2)
 +    REJECT("LinkCertLifetime is too short.");
 +  if (options->TestingAuthKeyLifetime < options->TestingLinkKeySlop*2)
 +    REJECT("TestingAuthKeyLifetime is too short.");
 +
 +  if (options->TestingV3AuthInitialVotingInterval
 +      < MIN_VOTE_INTERVAL_TESTING_INITIAL) {
 +    REJECT("TestingV3AuthInitialVotingInterval is insanely low.");
 +  } else if (((30*60) % options->TestingV3AuthInitialVotingInterval) != 0) {
 +    REJECT("TestingV3AuthInitialVotingInterval does not divide evenly into "
 +           "30 minutes.");
 +  }
 +
 +  if (options->TestingV3AuthInitialVoteDelay < MIN_VOTE_SECONDS_TESTING) {
 +    REJECT("TestingV3AuthInitialVoteDelay is way too low.");
 +  }
 +
 +  if (options->TestingV3AuthInitialDistDelay < MIN_DIST_SECONDS_TESTING) {
 +    REJECT("TestingV3AuthInitialDistDelay is way too low.");
 +  }
 +
 +  if (options->TestingV3AuthInitialVoteDelay +
 +      options->TestingV3AuthInitialDistDelay >=
 +      options->TestingV3AuthInitialVotingInterval) {
 +    REJECT("TestingV3AuthInitialVoteDelay plus TestingV3AuthInitialDistDelay "
 +           "must be less than TestingV3AuthInitialVotingInterval");
 +  }
 +
 +  if (options->TestingV3AuthVotingStartOffset >
 +      MIN(options->TestingV3AuthInitialVotingInterval,
 +          options->V3AuthVotingInterval)) {
 +    REJECT("TestingV3AuthVotingStartOffset is higher than the voting "
 +           "interval.");
 +  } else if (options->TestingV3AuthVotingStartOffset < 0) {
 +    REJECT("TestingV3AuthVotingStartOffset must be non-negative.");
 +  }
 +
 +  if (options->TestingAuthDirTimeToLearnReachability < 0) {
 +    REJECT("TestingAuthDirTimeToLearnReachability must be non-negative.");
 +  } else if (options->TestingAuthDirTimeToLearnReachability > 2*60*60) {
 +    COMPLAIN("TestingAuthDirTimeToLearnReachability is insanely high.");
 +  }
 +
 +  if (options->TestingEstimatedDescriptorPropagationTime < 0) {
 +    REJECT("TestingEstimatedDescriptorPropagationTime must be non-negative.");
 +  } else if (options->TestingEstimatedDescriptorPropagationTime > 60*60) {
 +    COMPLAIN("TestingEstimatedDescriptorPropagationTime is insanely high.");
 +  }
 +
 +  if (options->TestingClientMaxIntervalWithoutRequest < 1) {
 +    REJECT("TestingClientMaxIntervalWithoutRequest is way too low.");
 +  } else if (options->TestingClientMaxIntervalWithoutRequest > 3600) {
 +    COMPLAIN("TestingClientMaxIntervalWithoutRequest is insanely high.");
 +  }
 +
 +  if (options->TestingDirConnectionMaxStall < 5) {
 +    REJECT("TestingDirConnectionMaxStall is way too low.");
 +  } else if (options->TestingDirConnectionMaxStall > 3600) {
 +    COMPLAIN("TestingDirConnectionMaxStall is insanely high.");
 +  }
 +
 +  if (options->ClientBootstrapConsensusMaxInProgressTries < 1) {
 +    REJECT("ClientBootstrapConsensusMaxInProgressTries must be greater "
 +           "than 0.");
 +  } else if (options->ClientBootstrapConsensusMaxInProgressTries
 +             > 100) {
 +    COMPLAIN("ClientBootstrapConsensusMaxInProgressTries is insanely "
 +             "high.");
 +  }
 +
 +  if (options->TestingEnableConnBwEvent &&
 +      !options->TestingTorNetwork && !options->UsingTestNetworkDefaults_) {
 +    REJECT("TestingEnableConnBwEvent may only be changed in testing "
 +           "Tor networks!");
 +  }
 +
 +  if (options->TestingEnableCellStatsEvent &&
 +      !options->TestingTorNetwork && !options->UsingTestNetworkDefaults_) {
 +    REJECT("TestingEnableCellStatsEvent may only be changed in testing "
 +           "Tor networks!");
 +  }
 +
 +  if (options->TestingTorNetwork) {
 +    log_warn(LD_CONFIG, "TestingTorNetwork is set. This will make your node "
 +                        "almost unusable in the public Tor network, and is "
 +                        "therefore only advised if you are building a "
 +                        "testing Tor network!");
 +  }
 +
 +  if (options->AccelName && !options->HardwareAccel)
 +    options->HardwareAccel = 1;
 +  if (options->AccelDir && !options->AccelName)
 +    REJECT("Can't use hardware crypto accelerator dir without engine name.");
 +
 +  if (options->PublishServerDescriptor)
 +    SMARTLIST_FOREACH(options->PublishServerDescriptor, const char *, pubdes, {
 +      if (!strcmp(pubdes, "1") || !strcmp(pubdes, "0"))
 +        if (smartlist_len(options->PublishServerDescriptor) > 1) {
 +          COMPLAIN("You have passed a list of multiple arguments to the "
 +                   "PublishServerDescriptor option that includes 0 or 1. "
 +                   "0 or 1 should only be used as the sole argument. "
 +                   "This configuration will be rejected in a future release.");
 +          break;
 +        }
 +    });
 +
 +  if (options->BridgeRelay == 1 && ! options->ORPort_set)
 +      REJECT("BridgeRelay is 1, ORPort is not set. This is an invalid "
 +             "combination.");
 +
 +  if (options_validate_scheduler(options, msg) < 0) {
 +    return -1;
 +  }
 +
 +  return 0;
 +}
 +
 +#undef REJECT
 +#undef COMPLAIN
 +
 +/* Given the value that the user has set for MaxMemInQueues, compute the
 + * actual maximum value.  We clip this value if it's too low, and autodetect
 + * it if it's set to 0. */
 +STATIC uint64_t
 +compute_real_max_mem_in_queues(const uint64_t val, int log_guess)
 +{
 +  uint64_t result;
 +
 +  if (val == 0) {
 +#define ONE_GIGABYTE (UINT64_C(1) << 30)
 +#define ONE_MEGABYTE (UINT64_C(1) << 20)
 +    /* The user didn't pick a memory limit.  Choose a very large one
 +     * that is still smaller than the system memory */
 +    static int notice_sent = 0;
 +    size_t ram = 0;
 +    if (get_total_system_memory(&ram) < 0) {
 +      /* We couldn't determine our total system memory!  */
 +#if SIZEOF_VOID_P >= 8
 +      /* 64-bit system.  Let's hope for 8 GB. */
 +      result = 8 * ONE_GIGABYTE;
 +#else
 +      /* (presumably) 32-bit system. Let's hope for 1 GB. */
 +      result = ONE_GIGABYTE;
 +#endif /* SIZEOF_VOID_P >= 8 */
 +    } else {
 +      /* We detected the amount of memory available. */
 +      uint64_t avail = 0;
 +
 +#if SIZEOF_SIZE_T > 4
 +/* On a 64-bit platform, we consider 8GB "very large". */
 +#define RAM_IS_VERY_LARGE(x) ((x) >= (8 * ONE_GIGABYTE))
 +#else
 +/* On a 32-bit platform, we can't have 8GB of ram. */
 +#define RAM_IS_VERY_LARGE(x) (0)
 +#endif
 +
 +      if (RAM_IS_VERY_LARGE(ram)) {
 +        /* If we have 8 GB, or more, RAM available, we set the MaxMemInQueues
 +         * to 0.4 * RAM. The idea behind this value is that the amount of RAM
 +         * is more than enough for a single relay and should allow the relay
 +         * operator to run two relays if they have additional bandwidth
 +         * available.
 +         */
 +        avail = (ram / 5) * 2;
 +      } else {
 +        /* If we have less than 8 GB of RAM available, we use the "old" default
 +         * for MaxMemInQueues of 0.75 * RAM.
 +         */
 +        avail = (ram / 4) * 3;
 +      }
 +
 +      /* Make sure it's in range from 0.25 GB to 8 GB for 64-bit and 0.25 to 2
 +       * GB for 32-bit. */
 +      if (avail > MAX_DEFAULT_MEMORY_QUEUE_SIZE) {
 +        /* If you want to use more than this much RAM, you need to configure
 +           it yourself */
 +        result = MAX_DEFAULT_MEMORY_QUEUE_SIZE;
 +      } else if (avail < ONE_GIGABYTE / 4) {
 +        result = ONE_GIGABYTE / 4;
 +      } else {
 +        result = avail;
 +      }
 +    }
 +    if (log_guess && ! notice_sent) {
 +      log_notice(LD_CONFIG, "%sMaxMemInQueues is set to %"PRIu64" MB. "
 +                 "You can override this by setting MaxMemInQueues by hand.",
 +                 ram ? "Based on detected system memory, " : "",
 +                 (result / ONE_MEGABYTE));
 +      notice_sent = 1;
 +    }
 +    return result;
 +  } else if (val < ONE_GIGABYTE / 4) {
 +    log_warn(LD_CONFIG, "MaxMemInQueues must be at least 256 MB for now. "
 +             "Ideally, have it as large as you can afford.");
 +    return ONE_GIGABYTE / 4;
 +  } else {
 +    /* The value was fine all along */
 +    return val;
 +  }
 +}
 +
 +/* If we have less than 300 MB suggest disabling dircache */
 +#define DIRCACHE_MIN_MEM_MB 300
 +#define DIRCACHE_MIN_MEM_BYTES (DIRCACHE_MIN_MEM_MB*ONE_MEGABYTE)
 +#define STRINGIFY(val) #val
 +
 +/** Create a warning message for emitting if we are a dircache but may not have
 + * enough system memory, or if we are not a dircache but probably should be.
 + * Return -1 when a message is returned in *msg*, else return 0. */
 +STATIC int
 +have_enough_mem_for_dircache(const or_options_t *options, size_t total_mem,
 +                             char **msg)
 +{
 +  *msg = NULL;
 +  /* XXX We should possibly be looking at MaxMemInQueues here
 +   * unconditionally.  Or we should believe total_mem unconditionally. */
 +  if (total_mem == 0) {
 +    if (get_total_system_memory(&total_mem) < 0) {
 +      total_mem = options->MaxMemInQueues >= SIZE_MAX ?
 +        SIZE_MAX : (size_t)options->MaxMemInQueues;
 +    }
 +  }
 +  if (options->DirCache) {
 +    if (total_mem < DIRCACHE_MIN_MEM_BYTES) {
 +      if (options->BridgeRelay) {
 +        tor_asprintf(msg, "Running a Bridge with less than %d MB of memory "
 +                       "is not recommended.", DIRCACHE_MIN_MEM_MB);
 +      } else {
 +        tor_asprintf(msg, "Being a directory cache (default) with less than "
 +                       "%d MB of memory is not recommended and may consume "
 +                       "most of the available resources. Consider disabling "
 +                       "this functionality by setting the DirCache option "
 +                       "to 0.", DIRCACHE_MIN_MEM_MB);
 +      }
 +    }
 +  } else {
 +    if (total_mem >= DIRCACHE_MIN_MEM_BYTES) {
 +      *msg = tor_strdup("DirCache is disabled and we are configured as a "
 +               "relay. We will not become a Guard.");
 +    }
 +  }
 +  return *msg == NULL ? 0 : -1;
 +}
 +#undef STRINGIFY
 +
 +/** Helper: return true iff s1 and s2 are both NULL, or both non-NULL
 + * equal strings. */
 +static int
 +opt_streq(const char *s1, const char *s2)
 +{
 +  return 0 == strcmp_opt(s1, s2);
 +}
 +
 +/** Check if any of the previous options have changed but aren't allowed to. */
 +static int
 +options_transition_allowed(const or_options_t *old,
 +                           const or_options_t *new_val,
 +                           char **msg)
 +{
 +  if (!old)
 +    return 0;
 +
 +#define BAD_CHANGE_TO(opt, how) do {                                    \
 +    *msg = tor_strdup("While Tor is running"how", changing " #opt       \
 +                      " is not allowed");                               \
 +    return -1;                                                          \
 +  } while (0)
 +
 +#define NO_CHANGE_BOOL(opt) \
 +  if (! CFG_EQ_BOOL(old, new_val, opt)) BAD_CHANGE_TO(opt,"")
 +#define NO_CHANGE_INT(opt) \
 +  if (! CFG_EQ_INT(old, new_val, opt)) BAD_CHANGE_TO(opt,"")
 +#define NO_CHANGE_STRING(opt) \
 +  if (! CFG_EQ_STRING(old, new_val, opt)) BAD_CHANGE_TO(opt,"")
 +
 +  NO_CHANGE_STRING(PidFile);
 +  NO_CHANGE_BOOL(RunAsDaemon);
 +  NO_CHANGE_BOOL(Sandbox);
 +  NO_CHANGE_STRING(DataDirectory);
 +  NO_CHANGE_STRING(KeyDirectory);
 +  NO_CHANGE_STRING(CacheDirectory);
 +  NO_CHANGE_STRING(User);
 +  NO_CHANGE_BOOL(KeepBindCapabilities);
 +  NO_CHANGE_STRING(SyslogIdentityTag);
 +  NO_CHANGE_STRING(AndroidIdentityTag);
 +  NO_CHANGE_BOOL(HardwareAccel);
 +  NO_CHANGE_STRING(AccelName);
 +  NO_CHANGE_STRING(AccelDir);
 +  NO_CHANGE_BOOL(TestingTorNetwork);
 +  NO_CHANGE_BOOL(DisableAllSwap);
 +  NO_CHANGE_INT(TokenBucketRefillInterval);
 +  NO_CHANGE_BOOL(HiddenServiceSingleHopMode);
 +  NO_CHANGE_BOOL(HiddenServiceNonAnonymousMode);
 +  NO_CHANGE_BOOL(DisableDebuggerAttachment);
 +  NO_CHANGE_BOOL(NoExec);
 +  NO_CHANGE_INT(OwningControllerFD);
 +  NO_CHANGE_BOOL(DisableSignalHandlers);
 +
 +  if (sandbox_is_active()) {
 +#define SB_NOCHANGE_STR(opt)                      \
 +    if (! CFG_EQ_STRING(old, new_val, opt))       \
 +      BAD_CHANGE_TO(opt," with Sandbox active")
 +#define SB_NOCHANGE_LINELIST(opt)                  \
 +    if (! CFG_EQ_LINELIST(old, new_val, opt))      \
 +      BAD_CHANGE_TO(opt," with Sandbox active")
 +#define SB_NOCHANGE_INT(opt)                       \
 +    if (! CFG_EQ_INT(old, new_val, opt))           \
 +      BAD_CHANGE_TO(opt," with Sandbox active")
 +
 +    SB_NOCHANGE_STR(Address);
 +    SB_NOCHANGE_STR(ServerDNSResolvConfFile);
 +    SB_NOCHANGE_STR(DirPortFrontPage);
 +    SB_NOCHANGE_STR(CookieAuthFile);
 +    SB_NOCHANGE_STR(ExtORPortCookieAuthFile);
 +    SB_NOCHANGE_LINELIST(Logs);
 +    SB_NOCHANGE_INT(ConnLimit);
 +
 +    if (server_mode(old) != server_mode(new_val)) {
 +      *msg = tor_strdup("Can't start/stop being a server while "
 +                        "Sandbox is active");
 +      return -1;
 +    }
 +  }
 +
 +#undef SB_NOCHANGE_LINELIST
 +#undef SB_NOCHANGE_STR
 +#undef SB_NOCHANGE_INT
 +#undef BAD_CHANGE_TO
 +#undef NO_CHANGE_BOOL
 +#undef NO_CHANGE_INT
 +#undef NO_CHANGE_STRING
 +  return 0;
 +}
 +
 +/** Return 1 if any change from <b>old_options</b> to <b>new_options</b>
 + * will require us to rotate the CPU and DNS workers; else return 0. */
 +static int
 +options_transition_affects_workers(const or_options_t *old_options,
 +                                   const or_options_t *new_options)
 +{
 +  YES_IF_CHANGED_STRING(DataDirectory);
 +  YES_IF_CHANGED_INT(NumCPUs);
 +  YES_IF_CHANGED_LINELIST(ORPort_lines);
 +  YES_IF_CHANGED_BOOL(ServerDNSSearchDomains);
 +  YES_IF_CHANGED_BOOL(SafeLogging_);
 +  YES_IF_CHANGED_BOOL(ClientOnly);
 +  YES_IF_CHANGED_BOOL(LogMessageDomains);
 +  YES_IF_CHANGED_LINELIST(Logs);
 +
 +  if (server_mode(old_options) != server_mode(new_options) ||
 +      public_server_mode(old_options) != public_server_mode(new_options) ||
 +      dir_server_mode(old_options) != dir_server_mode(new_options))
 +    return 1;
 +
 +  /* Nothing that changed matters. */
 +  return 0;
 +}
 +
 +/** Return 1 if any change from <b>old_options</b> to <b>new_options</b>
 + * will require us to generate a new descriptor; else return 0. */
 +static int
 +options_transition_affects_descriptor(const or_options_t *old_options,
 +                                      const or_options_t *new_options)
 +{
 +  /* XXX We can be smarter here. If your DirPort isn't being
 +   * published and you just turned it off, no need to republish. Etc. */
 +
 +  YES_IF_CHANGED_STRING(DataDirectory);
 +  YES_IF_CHANGED_STRING(Nickname);
 +  YES_IF_CHANGED_STRING(Address);
 +  YES_IF_CHANGED_LINELIST(ExitPolicy);
 +  YES_IF_CHANGED_BOOL(ExitRelay);
 +  YES_IF_CHANGED_BOOL(ExitPolicyRejectPrivate);
 +  YES_IF_CHANGED_BOOL(ExitPolicyRejectLocalInterfaces);
 +  YES_IF_CHANGED_BOOL(IPv6Exit);
 +  YES_IF_CHANGED_LINELIST(ORPort_lines);
 +  YES_IF_CHANGED_LINELIST(DirPort_lines);
 +  YES_IF_CHANGED_LINELIST(DirPort_lines);
 +  YES_IF_CHANGED_BOOL(ClientOnly);
 +  YES_IF_CHANGED_BOOL(DisableNetwork);
 +  YES_IF_CHANGED_BOOL(PublishServerDescriptor_);
 +  YES_IF_CHANGED_STRING(ContactInfo);
 +  YES_IF_CHANGED_STRING(BridgeDistribution);
 +  YES_IF_CHANGED_LINELIST(MyFamily);
 +  YES_IF_CHANGED_STRING(AccountingStart);
 +  YES_IF_CHANGED_INT(AccountingMax);
 +  YES_IF_CHANGED_INT(AccountingRule);
 +  YES_IF_CHANGED_BOOL(DirCache);
 +  YES_IF_CHANGED_BOOL(AssumeReachable);
 +
 +  if (get_effective_bwrate(old_options) != get_effective_bwrate(new_options) ||
 +      get_effective_bwburst(old_options) !=
 +        get_effective_bwburst(new_options) ||
 +      public_server_mode(old_options) != public_server_mode(new_options))
 +    return 1;
 +
 +  return 0;
 +}
 +
 +#ifdef _WIN32
 +/** Return the directory on windows where we expect to find our application
 + * data. */
 +static char *
 +get_windows_conf_root(void)
 +{
 +  static int is_set = 0;
 +  static char path[MAX_PATH*2+1];
 +  TCHAR tpath[MAX_PATH] = {0};
 +
 +  LPITEMIDLIST idl;
 +  IMalloc *m;
 +  HRESULT result;
 +
 +  if (is_set)
 +    return path;
 +
 +  /* Find X:\documents and settings\username\application data\ .
 +   * We would use SHGetSpecialFolder path, but that wasn't added until IE4.
 +   */
 +#ifdef ENABLE_LOCAL_APPDATA
 +#define APPDATA_PATH CSIDL_LOCAL_APPDATA
 +#else
 +#define APPDATA_PATH CSIDL_APPDATA
 +#endif
 +  if (!SUCCEEDED(SHGetSpecialFolderLocation(NULL, APPDATA_PATH, &idl))) {
 +    getcwd(path,MAX_PATH);
 +    is_set = 1;
 +    log_warn(LD_CONFIG,
 +             "I couldn't find your application data folder: are you "
 +             "running an ancient version of Windows 95? Defaulting to \"%s\"",
 +             path);
 +    return path;
 +  }
 +  /* Convert the path from an "ID List" (whatever that is!) to a path. */
 +  result = SHGetPathFromIDList(idl, tpath);
 +#ifdef UNICODE
 +  wcstombs(path,tpath,sizeof(path));
 +  path[sizeof(path)-1] = '\0';
 +#else
 +  strlcpy(path,tpath,sizeof(path));
 +#endif /* defined(UNICODE) */
 +
 +  /* Now we need to free the memory that the path-idl was stored in.  In
 +   * typical Windows fashion, we can't just call 'free()' on it. */
 +  SHGetMalloc(&m);
 +  if (m) {
 +    m->lpVtbl->Free(m, idl);
 +    m->lpVtbl->Release(m);
 +  }
 +  if (!SUCCEEDED(result)) {
 +    return NULL;
 +  }
 +  strlcat(path,"\\tor",MAX_PATH);
 +  is_set = 1;
 +  return path;
 +}
 +#endif /* defined(_WIN32) */
 +
 +/** Return the default location for our torrc file (if <b>defaults_file</b> is
 + * false), or for the torrc-defaults file (if <b>defaults_file</b> is true). */
 +static const char *
 +get_default_conf_file(int defaults_file)
 +{
 +#ifdef DISABLE_SYSTEM_TORRC
 +  (void) defaults_file;
 +  return NULL;
 +#elif defined(_WIN32)
 +  if (defaults_file) {
 +    static char defaults_path[MAX_PATH+1];
 +    tor_snprintf(defaults_path, MAX_PATH, "%s\\torrc-defaults",
 +                 get_windows_conf_root());
 +    return defaults_path;
 +  } else {
 +    static char path[MAX_PATH+1];
 +    tor_snprintf(path, MAX_PATH, "%s\\torrc",
 +                 get_windows_conf_root());
 +    return path;
 +  }
 +#else
 +  return defaults_file ? CONFDIR "/torrc-defaults" : CONFDIR "/torrc";
 +#endif /* defined(DISABLE_SYSTEM_TORRC) || ... */
 +}
 +
 +/** Verify whether lst is a list of strings containing valid-looking
 + * comma-separated nicknames, or NULL. Will normalise <b>lst</b> to prefix '$'
 + * to any nickname or fingerprint that needs it. Also splits comma-separated
 + * list elements into multiple elements. Return 0 on success.
 + * Warn and return -1 on failure.
 + */
 +static int
 +normalize_nickname_list(config_line_t **normalized_out,
 +                        const config_line_t *lst, const char *name,
 +                        char **msg)
 +{
 +  if (!lst)
 +    return 0;
 +
 +  config_line_t *new_nicknames = NULL;
 +  config_line_t **new_nicknames_next = &new_nicknames;
 +
 +  const config_line_t *cl;
 +  for (cl = lst; cl; cl = cl->next) {
 +    const char *line = cl->value;
 +    if (!line)
 +      continue;
 +
 +    int valid_line = 1;
 +    smartlist_t *sl = smartlist_new();
 +    smartlist_split_string(sl, line, ",",
 +      SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK|SPLIT_STRIP_SPACE, 0);
 +    SMARTLIST_FOREACH_BEGIN(sl, char *, s)
 +    {
 +      char *normalized = NULL;
 +      if (!is_legal_nickname_or_hexdigest(s)) {
 +        // check if first char is dollar
 +        if (s[0] != '$') {
 +          // Try again but with a dollar symbol prepended
 +          char *prepended;
 +          tor_asprintf(&prepended, "$%s", s);
 +
 +          if (is_legal_nickname_or_hexdigest(prepended)) {
 +            // The nickname is valid when it's prepended, set it as the
 +            // normalized version
 +            normalized = prepended;
 +          } else {
 +            // Still not valid, free and fallback to error message
 +            tor_free(prepended);
 +          }
 +        }
 +
 +        if (!normalized) {
 +          tor_asprintf(msg, "Invalid nickname '%s' in %s line", s, name);
 +          valid_line = 0;
 +          break;
 +        }
 +      } else {
 +        normalized = tor_strdup(s);
 +      }
 +
 +      config_line_t *next = tor_malloc_zero(sizeof(*next));
 +      next->key = tor_strdup(cl->key);
 +      next->value = normalized;
 +      next->next = NULL;
 +
 +      *new_nicknames_next = next;
 +      new_nicknames_next = &next->next;
 +    } SMARTLIST_FOREACH_END(s);
 +
 +    SMARTLIST_FOREACH(sl, char *, s, tor_free(s));
 +    smartlist_free(sl);
 +
 +    if (!valid_line) {
 +      config_free_lines(new_nicknames);
 +      return -1;
 +    }
 +  }
 +
 +  *normalized_out = new_nicknames;
 +
 +  return 0;
 +}
 +
 +/** Learn config file name from command line arguments, or use the default.
 + *
 + * If <b>defaults_file</b> is true, we're looking for torrc-defaults;
 + * otherwise, we're looking for the regular torrc_file.
 + *
 + * Set *<b>using_default_fname</b> to true if we're using the default
 + * configuration file name; or false if we've set it from the command line.
 + *
 + * Set *<b>ignore_missing_torrc</b> to true if we should ignore the resulting
 + * filename if it doesn't exist.
 + */
 +static char *
 +find_torrc_filename(config_line_t *cmd_arg,
 +                    int defaults_file,
 +                    int *using_default_fname, int *ignore_missing_torrc)
 +{
 +  char *fname=NULL;
 +  config_line_t *p_index;
 +  const char *fname_opt = defaults_file ? "--defaults-torrc" : "-f";
 +  const char *ignore_opt = defaults_file ? NULL : "--ignore-missing-torrc";
 +
 +  if (defaults_file)
 +    *ignore_missing_torrc = 1;
 +
 +  for (p_index = cmd_arg; p_index; p_index = p_index->next) {
 +    if (!strcmp(p_index->key, fname_opt)) {
 +      if (fname) {
 +        log_warn(LD_CONFIG, "Duplicate %s options on command line.",
 +            fname_opt);
 +        tor_free(fname);
 +      }
 +      fname = expand_filename(p_index->value);
 +
 +      {
 +        char *absfname;
 +        absfname = make_path_absolute(fname);
 +        tor_free(fname);
 +        fname = absfname;
 +      }
 +
 +      *using_default_fname = 0;
 +    } else if (ignore_opt && !strcmp(p_index->key,ignore_opt)) {
 +      *ignore_missing_torrc = 1;
 +    }
 +  }
 +
 +  if (*using_default_fname) {
 +    /* didn't find one, try CONFDIR */
 +    const char *dflt = get_default_conf_file(defaults_file);
 +    file_status_t st = file_status(dflt);
 +    if (dflt && (st == FN_FILE || st == FN_EMPTY)) {
 +      fname = tor_strdup(dflt);
 +    } else {
 +#ifndef _WIN32
 +      char *fn = NULL;
 +      if (!defaults_file) {
 +        fn = expand_filename("~/.torrc");
 +      }
 +      if (fn) {
 +        file_status_t hmst = file_status(fn);
 +        if (hmst == FN_FILE || hmst == FN_EMPTY || dflt == NULL) {
 +          fname = fn;
 +        } else {
 +          tor_free(fn);
 +          fname = tor_strdup(dflt);
 +        }
 +      } else {
 +        fname = dflt ? tor_strdup(dflt) : NULL;
 +      }
 +#else /* !(!defined(_WIN32)) */
 +      fname = dflt ? tor_strdup(dflt) : NULL;
 +#endif /* !defined(_WIN32) */
 +    }
 +  }
 +  return fname;
 +}
 +
 +/** Read the torrc from standard input and return it as a string.
 + * Upon failure, return NULL.
 + */
 +static char *
 +load_torrc_from_stdin(void)
 +{
 +   size_t sz_out;
 +
 +   return read_file_to_str_until_eof(STDIN_FILENO,SIZE_MAX,&sz_out);
 +}
 +
 +/** Load a configuration file from disk, setting torrc_fname or
 + * torrc_defaults_fname if successful.
 + *
 + * If <b>defaults_file</b> is true, load torrc-defaults; otherwise load torrc.
 + *
 + * Return the contents of the file on success, and NULL on failure.
 + */
 +static char *
 +load_torrc_from_disk(config_line_t *cmd_arg, int defaults_file)
 +{
 +  char *fname=NULL;
 +  char *cf = NULL;
 +  int using_default_torrc = 1;
 +  int ignore_missing_torrc = 0;
 +  char **fname_var = defaults_file ? &torrc_defaults_fname : &torrc_fname;
 +
 +  if (*fname_var == NULL) {
 +    fname = find_torrc_filename(cmd_arg, defaults_file,
 +                                &using_default_torrc, &ignore_missing_torrc);
 +    tor_free(*fname_var);
 +    *fname_var = fname;
 +  } else {
 +    fname = *fname_var;
 +  }
 +  log_debug(LD_CONFIG, "Opening config file \"%s\"", fname?fname:"<NULL>");
 +
 +  /* Open config file */
 +  file_status_t st = fname ? file_status(fname) : FN_EMPTY;
 +  if (fname == NULL ||
 +      !(st == FN_FILE || st == FN_EMPTY) ||
 +      !(cf = read_file_to_str(fname,0,NULL))) {
 +    if (using_default_torrc == 1 || ignore_missing_torrc) {
 +      if (!defaults_file)
 +        log_notice(LD_CONFIG, "Configuration file \"%s\" not present, "
 +            "using reasonable defaults.", fname);
 +      tor_free(fname); /* sets fname to NULL */
 +      *fname_var = NULL;
 +      cf = tor_strdup("");
 +    } else {
 +      log_warn(LD_CONFIG,
 +          "Unable to open configuration file \"%s\".", fname);
 +      goto err;
 +    }
 +  } else {
 +    log_notice(LD_CONFIG, "Read configuration file \"%s\".", fname);
 +  }
 +
 +  return cf;
 + err:
 +  tor_free(fname);
 +  *fname_var = NULL;
 +  return NULL;
 +}
 +
 +/** Read a configuration file into <b>options</b>, finding the configuration
 + * file location based on the command line.  After loading the file
 + * call options_init_from_string() to load the config.
 + * Return 0 if success, -1 if failure, and 1 if we succeeded but should exit
 + * anyway. */
 +int
 +options_init_from_torrc(int argc, char **argv)
 +{
 +  char *cf=NULL, *cf_defaults=NULL;
 +  int command;
 +  int retval = -1;
 +  char *command_arg = NULL;
 +  char *errmsg=NULL;
 +  config_line_t *p_index = NULL;
 +  config_line_t *cmdline_only_options = NULL;
 +
 +  /* Go through command-line variables */
 +  if (! have_parsed_cmdline) {
 +    /* Or we could redo the list every time we pass this place.
 +     * It does not really matter */
 +    if (config_parse_commandline(argc, argv, 0, &global_cmdline_options,
 +                                 &global_cmdline_only_options) < 0) {
 +      goto err;
 +    }
 +    have_parsed_cmdline = 1;
 +  }
 +  cmdline_only_options = global_cmdline_only_options;
 +
 +  if (config_line_find(cmdline_only_options, "-h") ||
 +      config_line_find(cmdline_only_options, "--help")) {
 +    print_usage();
 +    return 1;
 +  }
 +  if (config_line_find(cmdline_only_options, "--list-torrc-options")) {
 +    /* For validating whether we've documented everything. */
 +    list_torrc_options();
 +    return 1;
 +  }
 +  if (config_line_find(cmdline_only_options, "--list-deprecated-options")) {
 +    /* For validating whether what we have deprecated really exists. */
 +    list_deprecated_options();
 +    return 1;
 +  }
 +
 +  if (config_line_find(cmdline_only_options, "--version")) {
 +    printf("Tor version %s.\n",get_version());
 +    return 1;
 +  }
 +
 +  if (config_line_find(cmdline_only_options, "--library-versions")) {
 +    printf("Tor version %s. \n", get_version());
 +    printf("Library versions\tCompiled\t\tRuntime\n");
 +    printf("Libevent\t\t%-15s\t\t%s\n",
 +                      tor_libevent_get_header_version_str(),
 +                      tor_libevent_get_version_str());
 +#ifdef ENABLE_OPENSSL
 +    printf("OpenSSL \t\t%-15s\t\t%s\n",
 +                      crypto_openssl_get_header_version_str(),
 +                      crypto_openssl_get_version_str());
 +#endif
 +#ifdef ENABLE_NSS
 +    printf("NSS \t\t%-15s\t\t%s\n",
 +           crypto_nss_get_header_version_str(),
 +           crypto_nss_get_version_str());
 +#endif
 +    if (tor_compress_supports_method(ZLIB_METHOD)) {
 +      printf("Zlib    \t\t%-15s\t\t%s\n",
 +                        tor_compress_version_str(ZLIB_METHOD),
 +                        tor_compress_header_version_str(ZLIB_METHOD));
 +    }
 +    if (tor_compress_supports_method(LZMA_METHOD)) {
 +      printf("Liblzma \t\t%-15s\t\t%s\n",
 +                        tor_compress_version_str(LZMA_METHOD),
 +                        tor_compress_header_version_str(LZMA_METHOD));
 +    }
 +    if (tor_compress_supports_method(ZSTD_METHOD)) {
 +      printf("Libzstd \t\t%-15s\t\t%s\n",
 +                        tor_compress_version_str(ZSTD_METHOD),
 +                        tor_compress_header_version_str(ZSTD_METHOD));
 +    }
 +    //TODO: Hex versions?
 +    return 1;
 +  }
 +
 +  command = CMD_RUN_TOR;
 +  for (p_index = cmdline_only_options; p_index; p_index = p_index->next) {
 +    if (!strcmp(p_index->key,"--keygen")) {
 +      command = CMD_KEYGEN;
 +    } else if (!strcmp(p_index->key, "--key-expiration")) {
 +      command = CMD_KEY_EXPIRATION;
 +      command_arg = p_index->value;
 +    } else if (!strcmp(p_index->key,"--list-fingerprint")) {
 +      command = CMD_LIST_FINGERPRINT;
 +    } else if (!strcmp(p_index->key, "--hash-password")) {
 +      command = CMD_HASH_PASSWORD;
 +      command_arg = p_index->value;
 +    } else if (!strcmp(p_index->key, "--dump-config")) {
 +      command = CMD_DUMP_CONFIG;
 +      command_arg = p_index->value;
 +    } else if (!strcmp(p_index->key, "--verify-config")) {
 +      command = CMD_VERIFY_CONFIG;
 +    }
 +  }
 +
 +  if (command == CMD_HASH_PASSWORD) {
 +    cf_defaults = tor_strdup("");
 +    cf = tor_strdup("");
 +  } else {
 +    cf_defaults = load_torrc_from_disk(cmdline_only_options, 1);
 +
 +    const config_line_t *f_line = config_line_find(cmdline_only_options,
 +                                                   "-f");
 +
 +    const int read_torrc_from_stdin =
 +    (f_line != NULL && strcmp(f_line->value, "-") == 0);
 +
 +    if (read_torrc_from_stdin) {
 +      cf = load_torrc_from_stdin();
 +    } else {
 +      cf = load_torrc_from_disk(cmdline_only_options, 0);
 +    }
 +
 +    if (!cf) {
 +      if (config_line_find(cmdline_only_options, "--allow-missing-torrc")) {
 +        cf = tor_strdup("");
 +      } else {
 +        goto err;
 +      }
 +    }
 +  }
 +
 +  retval = options_init_from_string(cf_defaults, cf, command, command_arg,
 +                                    &errmsg);
 +
 +  if (retval < 0)
 +    goto err;
 +
 +  if (config_line_find(cmdline_only_options, "--no-passphrase")) {
 +    if (command == CMD_KEYGEN) {
 +      get_options_mutable()->keygen_force_passphrase = FORCE_PASSPHRASE_OFF;
 +    } else {
 +      log_err(LD_CONFIG, "--no-passphrase specified without --keygen!");
 +      retval = -1;
 +      goto err;
 +    }
 +  }
 +
 +  if (config_line_find(cmdline_only_options, "--newpass")) {
 +    if (command == CMD_KEYGEN) {
 +      get_options_mutable()->change_key_passphrase = 1;
 +    } else {
 +      log_err(LD_CONFIG, "--newpass specified without --keygen!");
 +      retval = -1;
 +      goto err;
 +    }
 +  }
 +
 +  {
 +    const config_line_t *fd_line = config_line_find(cmdline_only_options,
 +                                                    "--passphrase-fd");
 +    if (fd_line) {
 +      if (get_options()->keygen_force_passphrase == FORCE_PASSPHRASE_OFF) {
 +        log_err(LD_CONFIG, "--no-passphrase specified with --passphrase-fd!");
 +        retval = -1;
 +        goto err;
 +      } else if (command != CMD_KEYGEN) {
 +        log_err(LD_CONFIG, "--passphrase-fd specified without --keygen!");
 +        retval = -1;
 +        goto err;
 +      } else {
 +        const char *v = fd_line->value;
 +        int ok = 1;
 +        long fd = tor_parse_long(v, 10, 0, INT_MAX, &ok, NULL);
 +        if (fd < 0 || ok == 0) {
 +          log_err(LD_CONFIG, "Invalid --passphrase-fd value %s", escaped(v));
 +          retval = -1;
 +          goto err;
 +        }
 +        get_options_mutable()->keygen_passphrase_fd = (int)fd;
 +        get_options_mutable()->use_keygen_passphrase_fd = 1;
 +        get_options_mutable()->keygen_force_passphrase = FORCE_PASSPHRASE_ON;
 +      }
 +    }
 +  }
 +
 +  {
 +    const config_line_t *key_line = config_line_find(cmdline_only_options,
 +                                                     "--master-key");
 +    if (key_line) {
 +      if (command != CMD_KEYGEN) {
 +        log_err(LD_CONFIG, "--master-key without --keygen!");
 +        retval = -1;
 +        goto err;
 +      } else {
 +        get_options_mutable()->master_key_fname = tor_strdup(key_line->value);
 +      }
 +    }
 +  }
 +
 + err:
 +
 +  tor_free(cf);
 +  tor_free(cf_defaults);
 +  if (errmsg) {
 +    log_warn(LD_CONFIG,"%s", errmsg);
 +    tor_free(errmsg);
 +  }
 +  return retval < 0 ? -1 : 0;
 +}
 +
 +/** Load the options from the configuration in <b>cf</b>, validate
 + * them for consistency and take actions based on them.
 + *
 + * Return 0 if success, negative on error:
 + *  * -1 for general errors.
 + *  * -2 for failure to parse/validate,
 + *  * -3 for transition not allowed
 + *  * -4 for error while setting the new options
 + */
 +setopt_err_t
 +options_init_from_string(const char *cf_defaults, const char *cf,
 +                         int command, const char *command_arg,
 +                         char **msg)
 +{
 +  or_options_t *oldoptions, *newoptions, *newdefaultoptions=NULL;
 +  config_line_t *cl;
 +  int retval;
 +  setopt_err_t err = SETOPT_ERR_MISC;
 +  int cf_has_include = 0;
 +  tor_assert(msg);
 +
 +  oldoptions = global_options; /* get_options unfortunately asserts if
 +                                  this is the first time we run*/
 +
 +  newoptions = tor_malloc_zero(sizeof(or_options_t));
 +  newoptions->magic_ = OR_OPTIONS_MAGIC;
 +  options_init(newoptions);
 +  newoptions->command = command;
 +  newoptions->command_arg = command_arg ? tor_strdup(command_arg) : NULL;
 +
 +  smartlist_t *opened_files = smartlist_new();
 +  for (int i = 0; i < 2; ++i) {
 +    const char *body = i==0 ? cf_defaults : cf;
 +    if (!body)
 +      continue;
 +
 +    /* get config lines, assign them */
 +    retval = config_get_lines_include(body, &cl, 1,
 +                                      body == cf ? &cf_has_include : NULL,
 +                                      opened_files);
 +    if (retval < 0) {
 +      err = SETOPT_ERR_PARSE;
 +      goto err;
 +    }
 +    retval = config_assign(&options_format, newoptions, cl,
 +                           CAL_WARN_DEPRECATIONS, msg);
 +    config_free_lines(cl);
 +    if (retval < 0) {
 +      err = SETOPT_ERR_PARSE;
 +      goto err;
 +    }
 +    if (i==0)
 +      newdefaultoptions = config_dup(&options_format, newoptions);
 +  }
 +
 +  if (newdefaultoptions == NULL) {
 +    newdefaultoptions = config_dup(&options_format, global_default_options);
 +  }
 +
 +  /* Go through command-line variables too */
 +  retval = config_assign(&options_format, newoptions,
 +                         global_cmdline_options, CAL_WARN_DEPRECATIONS, msg);
 +  if (retval < 0) {
 +    err = SETOPT_ERR_PARSE;
 +    goto err;
 +  }
 +
 +  newoptions->IncludeUsed = cf_has_include;
 +  newoptions->FilesOpenedByIncludes = opened_files;
 +
 +  /* If this is a testing network configuration, change defaults
 +   * for a list of dependent config options, re-initialize newoptions
 +   * with the new defaults, and assign all options to it second time. */
 +  if (newoptions->TestingTorNetwork) {
 +    /* XXXX this is a bit of a kludge.  perhaps there's a better way to do
 +     * this?  We could, for example, make the parsing algorithm do two passes
 +     * over the configuration.  If it finds any "suite" options like
 +     * TestingTorNetwork, it could change the defaults before its second pass.
 +     * Not urgent so long as this seems to work, but at any sign of trouble,
 +     * let's clean it up.  -NM */
 +
 +    /* Change defaults. */
 +    for (int i = 0; testing_tor_network_defaults[i].name; ++i) {
 +      const config_var_t *new_var = &testing_tor_network_defaults[i];
 +      config_var_t *old_var =
 +          config_find_option_mutable(&options_format, new_var->name);
 +      tor_assert(new_var);
 +      tor_assert(old_var);
 +      old_var->initvalue = new_var->initvalue;
 +
 +      if ((config_find_deprecation(&options_format, new_var->name))) {
 +        log_warn(LD_GENERAL, "Testing options override the deprecated "
 +                 "option %s. Is that intentional?",
 +                 new_var->name);
 +      }
 +    }
 +
 +    /* Clear newoptions and re-initialize them with new defaults. */
 +    or_options_free(newoptions);
 +    or_options_free(newdefaultoptions);
 +    newdefaultoptions = NULL;
 +    newoptions = tor_malloc_zero(sizeof(or_options_t));
 +    newoptions->magic_ = OR_OPTIONS_MAGIC;
 +    options_init(newoptions);
 +    newoptions->command = command;
 +    newoptions->command_arg = command_arg ? tor_strdup(command_arg) : NULL;
 +
 +    /* Assign all options a second time. */
 +    opened_files = smartlist_new();
 +    for (int i = 0; i < 2; ++i) {
 +      const char *body = i==0 ? cf_defaults : cf;
 +      if (!body)
 +        continue;
 +
 +      /* get config lines, assign them */
 +      retval = config_get_lines_include(body, &cl, 1,
 +                                        body == cf ? &cf_has_include : NULL,
 +                                        opened_files);
 +      if (retval < 0) {
 +        err = SETOPT_ERR_PARSE;
 +        goto err;
 +      }
 +      retval = config_assign(&options_format, newoptions, cl, 0, msg);
 +      config_free_lines(cl);
 +      if (retval < 0) {
 +        err = SETOPT_ERR_PARSE;
 +        goto err;
 +      }
 +      if (i==0)
 +        newdefaultoptions = config_dup(&options_format, newoptions);
 +    }
 +    /* Assign command-line variables a second time too */
 +    retval = config_assign(&options_format, newoptions,
 +                           global_cmdline_options, 0, msg);
 +    if (retval < 0) {
 +      err = SETOPT_ERR_PARSE;
 +      goto err;
 +    }
 +  }
 +
 +  newoptions->IncludeUsed = cf_has_include;
 +  in_option_validation = 1;
 +  newoptions->FilesOpenedByIncludes = opened_files;
 +
 +  /* Validate newoptions */
 +  if (options_validate(oldoptions, newoptions, newdefaultoptions,
 +                       0, msg) < 0) {
 +    err = SETOPT_ERR_PARSE; /*XXX make this a separate return value.*/
 +    goto err;
 +  }
 +
 +  if (options_transition_allowed(oldoptions, newoptions, msg) < 0) {
 +    err = SETOPT_ERR_TRANSITION;
 +    goto err;
 +  }
 +  in_option_validation = 0;
 +
 +  if (set_options(newoptions, msg)) {
 +    err = SETOPT_ERR_SETTING;
 +    goto err; /* frees and replaces old options */
 +  }
 +
 +  or_options_free(global_default_options);
 +  global_default_options = newdefaultoptions;
 +
 +  return SETOPT_OK;
 +
 + err:
 +  in_option_validation = 0;
 +  if (opened_files) {
 +    SMARTLIST_FOREACH(opened_files, char *, f, tor_free(f));
 +    smartlist_free(opened_files);
 +  }
 +  // may have been set to opened_files, avoid double free
 +  newoptions->FilesOpenedByIncludes = NULL;
 +  or_options_free(newoptions);
 +  or_options_free(newdefaultoptions);
 +  if (*msg) {
 +    char *old_msg = *msg;
 +    tor_asprintf(msg, "Failed to parse/validate config: %s", old_msg);
 +    tor_free(old_msg);
 +  }
 +  return err;
 +}
 +
 +/** Return the location for our configuration file.  May return NULL.
 + */
 +const char *
 +get_torrc_fname(int defaults_fname)
 +{
 +  const char *fname = defaults_fname ? torrc_defaults_fname : torrc_fname;
 +
 +  if (fname)
 +    return fname;
 +  else
 +    return get_default_conf_file(defaults_fname);
 +}
 +
 +/** Adjust the address map based on the MapAddress elements in the
 + * configuration <b>options</b>
 + */
 +void
 +config_register_addressmaps(const or_options_t *options)
 +{
 +  smartlist_t *elts;
 +  config_line_t *opt;
 +  const char *from, *to, *msg;
 +
 +  addressmap_clear_configured();
 +  elts = smartlist_new();
 +  for (opt = options->AddressMap; opt; opt = opt->next) {
 +    smartlist_split_string(elts, opt->value, NULL,
 +                           SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 2);
 +    if (smartlist_len(elts) < 2) {
 +      log_warn(LD_CONFIG,"MapAddress '%s' has too few arguments. Ignoring.",
 +               opt->value);
 +      goto cleanup;
 +    }
 +
 +    from = smartlist_get(elts,0);
 +    to = smartlist_get(elts,1);
 +
 +    if (to[0] == '.' || from[0] == '.') {
 +      log_warn(LD_CONFIG,"MapAddress '%s' is ambiguous - address starts with a"
 +              "'.'. Ignoring.",opt->value);
 +      goto cleanup;
 +    }
 +
 +    if (addressmap_register_auto(from, to, 0, ADDRMAPSRC_TORRC, &msg) < 0) {
 +      log_warn(LD_CONFIG,"MapAddress '%s' failed: %s. Ignoring.", opt->value,
 +               msg);
 +      goto cleanup;
 +    }
 +
 +    if (smartlist_len(elts) > 2)
 +      log_warn(LD_CONFIG,"Ignoring extra arguments to MapAddress.");
 +
 +  cleanup:
 +    SMARTLIST_FOREACH(elts, char*, cp, tor_free(cp));
 +    smartlist_clear(elts);
 +  }
 +  smartlist_free(elts);
 +}
 +
 +/** As addressmap_register(), but detect the wildcarded status of "from" and
 + * "to", and do not steal a reference to <b>to</b>. */
 +/* XXXX move to connection_edge.c */
 +int
 +addressmap_register_auto(const char *from, const char *to,
 +                         time_t expires,
 +                         addressmap_entry_source_t addrmap_source,
 +                         const char **msg)
 +{
 +  int from_wildcard = 0, to_wildcard = 0;
 +
 +  *msg = "whoops, forgot the error message";
 +
 +  if (!strcmp(to, "*") || !strcmp(from, "*")) {
 +    *msg = "can't remap from or to *";
 +    return -1;
 +  }
 +  /* Detect asterisks in expressions of type: '*.example.com' */
 +  if (!strncmp(from,"*.",2)) {
 +    from += 2;
 +    from_wildcard = 1;
 +  }
 +  if (!strncmp(to,"*.",2)) {
 +    to += 2;
 +    to_wildcard = 1;
 +  }
 +
 +  if (to_wildcard && !from_wildcard) {
 +    *msg =  "can only use wildcard (i.e. '*.') if 'from' address "
 +      "uses wildcard also";
 +    return -1;
 +  }
 +
 +  if (address_is_invalid_destination(to, 1)) {
 +    *msg = "destination is invalid";
 +    return -1;
 +  }
 +
 +  addressmap_register(from, tor_strdup(to), expires, addrmap_source,
 +                      from_wildcard, to_wildcard);
 +
 +  return 0;
 +}
 +
 +/**
 + * As add_file_log, but open the file as appropriate.
 + */
 +STATIC int
 +open_and_add_file_log(const log_severity_list_t *severity,
 +                      const char *filename, int truncate_log)
 +{
 +  int open_flags = O_WRONLY|O_CREAT;
 +  open_flags |= truncate_log ? O_TRUNC : O_APPEND;
 +
 +  int fd = tor_open_cloexec(filename, open_flags, 0640);
 +  if (fd < 0)
 +    return -1;
 +
 +  return add_file_log(severity, filename, fd);
 +}
 +
 +/**
 + * Initialize the logs based on the configuration file.
 + */
 +static int
 +options_init_logs(const or_options_t *old_options, or_options_t *options,
 +                  int validate_only)
 +{
 +  config_line_t *opt;
 +  int ok;
 +  smartlist_t *elts;
 +  int run_as_daemon =
 +#ifdef _WIN32
 +               0;
 +#else
 +               options->RunAsDaemon;
 +#endif
 +
 +  if (options->LogTimeGranularity <= 0) {
 +    log_warn(LD_CONFIG, "Log time granularity '%d' has to be positive.",
 +             options->LogTimeGranularity);
 +    return -1;
 +  } else if (1000 % options->LogTimeGranularity != 0 &&
 +             options->LogTimeGranularity % 1000 != 0) {
 +    int granularity = options->LogTimeGranularity;
 +    if (granularity < 40) {
 +      do granularity++;
 +      while (1000 % granularity != 0);
 +    } else if (granularity < 1000) {
 +      granularity = 1000 / granularity;
 +      while (1000 % granularity != 0)
 +        granularity--;
 +      granularity = 1000 / granularity;
 +    } else {
 +      granularity = 1000 * ((granularity / 1000) + 1);
 +    }
 +    log_warn(LD_CONFIG, "Log time granularity '%d' has to be either a "
 +                        "divisor or a multiple of 1 second. Changing to "
 +                        "'%d'.",
 +             options->LogTimeGranularity, granularity);
 +    if (!validate_only)
 +      set_log_time_granularity(granularity);
 +  } else {
 +    if (!validate_only)
 +      set_log_time_granularity(options->LogTimeGranularity);
 +  }
 +
 +  ok = 1;
 +  elts = smartlist_new();
 +
 +  for (opt = options->Logs; opt; opt = opt->next) {
 +    log_severity_list_t *severity;
 +    const char *cfg = opt->value;
 +    severity = tor_malloc_zero(sizeof(log_severity_list_t));
 +    if (parse_log_severity_config(&cfg, severity) < 0) {
 +      log_warn(LD_CONFIG, "Couldn't parse log levels in Log option 'Log %s'",
 +               opt->value);
 +      ok = 0; goto cleanup;
 +    }
 +
 +    smartlist_split_string(elts, cfg, NULL,
 +                           SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 2);
 +
 +    if (smartlist_len(elts) == 0)
 +      smartlist_add_strdup(elts, "stdout");
 +
 +    if (smartlist_len(elts) == 1 &&
 +        (!strcasecmp(smartlist_get(elts,0), "stdout") ||
 +         !strcasecmp(smartlist_get(elts,0), "stderr"))) {
 +      int err = smartlist_len(elts) &&
 +        !strcasecmp(smartlist_get(elts,0), "stderr");
 +      if (!validate_only) {
 +        if (run_as_daemon) {
 +          log_warn(LD_CONFIG,
 +                   "Can't log to %s with RunAsDaemon set; skipping stdout",
 +                   err?"stderr":"stdout");
 +        } else {
 +          add_stream_log(severity, err?"<stderr>":"<stdout>",
 +                         fileno(err?stderr:stdout));
 +        }
 +      }
 +      goto cleanup;
 +    }
 +    if (smartlist_len(elts) == 1) {
 +      if (!strcasecmp(smartlist_get(elts,0), "syslog")) {
 +#ifdef HAVE_SYSLOG_H
 +        if (!validate_only) {
 +          add_syslog_log(severity, options->SyslogIdentityTag);
 +        }
 +#else
 +        log_warn(LD_CONFIG, "Syslog is not supported on this system. Sorry.");
 +#endif /* defined(HAVE_SYSLOG_H) */
 +        goto cleanup;
 +      }
 +
 +      if (!strcasecmp(smartlist_get(elts, 0), "android")) {
 +#ifdef HAVE_ANDROID_LOG_H
 +        if (!validate_only) {
 +          add_android_log(severity, options->AndroidIdentityTag);
 +        }
 +#else
 +        log_warn(LD_CONFIG, "Android logging is not supported"
 +                            " on this system. Sorry.");
 +#endif // HAVE_ANDROID_LOG_H.
 +        goto cleanup;
 +      }
 +    }
 +
 +    if (smartlist_len(elts) == 2 &&
 +        !strcasecmp(smartlist_get(elts,0), "file")) {
 +      if (!validate_only) {
 +        char *fname = expand_filename(smartlist_get(elts, 1));
 +        /* Truncate if TruncateLogFile is set and we haven't seen this option
 +           line before. */
 +        int truncate_log = 0;
 +        if (options->TruncateLogFile) {
 +          truncate_log = 1;
 +          if (old_options) {
 +            config_line_t *opt2;
 +            for (opt2 = old_options->Logs; opt2; opt2 = opt2->next)
 +              if (!strcmp(opt->value, opt2->value)) {
 +                truncate_log = 0;
 +                break;
 +              }
 +          }
 +        }
 +        if (open_and_add_file_log(severity, fname, truncate_log) < 0) {
 +          log_warn(LD_CONFIG, "Couldn't open file for 'Log %s': %s",
 +                   opt->value, strerror(errno));
 +          ok = 0;
 +        }
 +        tor_free(fname);
 +      }
 +      goto cleanup;
 +    }
 +
 +    log_warn(LD_CONFIG, "Bad syntax on file Log option 'Log %s'",
 +             opt->value);
 +    ok = 0; goto cleanup;
 +
 +  cleanup:
 +    SMARTLIST_FOREACH(elts, char*, cp, tor_free(cp));
 +    smartlist_clear(elts);
 +    tor_free(severity);
 +  }
 +  smartlist_free(elts);
 +
 +  if (ok && !validate_only)
 +    logs_set_domain_logging(options->LogMessageDomains);
 +
 +  return ok?0:-1;
 +}
 +
 +/** Given a smartlist of SOCKS arguments to be passed to a transport
 + *  proxy in <b>args</b>, validate them and return -1 if they are
 + *  corrupted. Return 0 if they seem OK. */
 +static int
 +validate_transport_socks_arguments(const smartlist_t *args)
 +{
 +  char *socks_string = NULL;
 +  size_t socks_string_len;
 +
 +  tor_assert(args);
 +  tor_assert(smartlist_len(args) > 0);
 +
 +  SMARTLIST_FOREACH_BEGIN(args, const char *, s) {
 +    if (!string_is_key_value(LOG_WARN, s)) { /* items should be k=v items */
 +      log_warn(LD_CONFIG, "'%s' is not a k=v item.", s);
 +      return -1;
 +    }
 +  } SMARTLIST_FOREACH_END(s);
 +
 +  socks_string = pt_stringify_socks_args(args);
 +  if (!socks_string)
 +    return -1;
 +
 +  socks_string_len = strlen(socks_string);
 +  tor_free(socks_string);
 +
 +  if (socks_string_len > MAX_SOCKS5_AUTH_SIZE_TOTAL) {
 +    log_warn(LD_CONFIG, "SOCKS arguments can't be more than %u bytes (%lu).",
 +             MAX_SOCKS5_AUTH_SIZE_TOTAL,
 +             (unsigned long) socks_string_len);
 +    return -1;
 +  }
 +
 +  return 0;
 +}
 +
 +/** Deallocate a bridge_line_t structure. */
 +/* private */ void
 +bridge_line_free_(bridge_line_t *bridge_line)
 +{
 +  if (!bridge_line)
 +    return;
 +
 +  if (bridge_line->socks_args) {
 +    SMARTLIST_FOREACH(bridge_line->socks_args, char*, s, tor_free(s));
 +    smartlist_free(bridge_line->socks_args);
 +  }
 +  tor_free(bridge_line->transport_name);
 +  tor_free(bridge_line);
 +}
 +
 +/** Parse the contents of a string, <b>line</b>, containing a Bridge line,
 + * into a bridge_line_t.
 + *
 + * Validates that the IP:PORT, fingerprint, and SOCKS arguments (given to the
 + * Pluggable Transport, if a one was specified) are well-formed.
 + *
 + * Returns NULL If the Bridge line could not be validated, and returns a
 + * bridge_line_t containing the parsed information otherwise.
 + *
 + * Bridge line format:
 + * Bridge [transport] IP:PORT [id-fingerprint] [k=v] [k=v] ...
 + */
 +/* private */ bridge_line_t *
 +parse_bridge_line(const char *line)
 +{
 +  smartlist_t *items = NULL;
 +  char *addrport=NULL, *fingerprint=NULL;
 +  char *field=NULL;
 +  bridge_line_t *bridge_line = tor_malloc_zero(sizeof(bridge_line_t));
 +
 +  items = smartlist_new();
 +  smartlist_split_string(items, line, NULL,
 +                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
 +  if (smartlist_len(items) < 1) {
 +    log_warn(LD_CONFIG, "Too few arguments to Bridge line.");
 +    goto err;
 +  }
 +
 +  /* first field is either a transport name or addrport */
 +  field = smartlist_get(items, 0);
 +  smartlist_del_keeporder(items, 0);
 +
 +  if (string_is_C_identifier(field)) {
 +    /* It's a transport name. */
 +    bridge_line->transport_name = field;
 +    if (smartlist_len(items) < 1) {
 +      log_warn(LD_CONFIG, "Too few items to Bridge line.");
 +      goto err;
 +    }
 +    addrport = smartlist_get(items, 0); /* Next field is addrport then. */
 +    smartlist_del_keeporder(items, 0);
 +  } else {
 +    addrport = field;
 +  }
 +
 +  if (tor_addr_port_parse(LOG_INFO, addrport,
 +                          &bridge_line->addr, &bridge_line->port, 443)<0) {
 +    log_warn(LD_CONFIG, "Error parsing Bridge address '%s'", addrport);
 +    goto err;
 +  }
 +
 +  /* If transports are enabled, next field could be a fingerprint or a
 +     socks argument. If transports are disabled, next field must be
 +     a fingerprint. */
 +  if (smartlist_len(items)) {
 +    if (bridge_line->transport_name) { /* transports enabled: */
 +      field = smartlist_get(items, 0);
 +      smartlist_del_keeporder(items, 0);
 +
 +      /* If it's a key=value pair, then it's a SOCKS argument for the
 +         transport proxy... */
 +      if (string_is_key_value(LOG_DEBUG, field)) {
 +        bridge_line->socks_args = smartlist_new();
 +        smartlist_add(bridge_line->socks_args, field);
 +      } else { /* ...otherwise, it's the bridge fingerprint. */
 +        fingerprint = field;
 +      }
 +
 +    } else { /* transports disabled: */
 +      fingerprint = smartlist_join_strings(items, "", 0, NULL);
 +    }
 +  }
 +
 +  /* Handle fingerprint, if it was provided. */
 +  if (fingerprint) {
 +    if (strlen(fingerprint) != HEX_DIGEST_LEN) {
 +      log_warn(LD_CONFIG, "Key digest for Bridge is wrong length.");
 +      goto err;
 +    }
 +    if (base16_decode(bridge_line->digest, DIGEST_LEN,
 +                      fingerprint, HEX_DIGEST_LEN) != DIGEST_LEN) {
 +      log_warn(LD_CONFIG, "Unable to decode Bridge key digest.");
 +      goto err;
 +    }
 +  }
 +
 +  /* If we are using transports, any remaining items in the smartlist
 +     should be k=v values. */
 +  if (bridge_line->transport_name && smartlist_len(items)) {
 +    if (!bridge_line->socks_args)
 +      bridge_line->socks_args = smartlist_new();
 +
 +    /* append remaining items of 'items' to 'socks_args' */
 +    smartlist_add_all(bridge_line->socks_args, items);
 +    smartlist_clear(items);
 +
 +    tor_assert(smartlist_len(bridge_line->socks_args) > 0);
 +  }
 +
 +  if (bridge_line->socks_args) {
 +    if (validate_transport_socks_arguments(bridge_line->socks_args) < 0)
 +      goto err;
 +  }
 +
 +  goto done;
 +
 + err:
 +  bridge_line_free(bridge_line);
 +  bridge_line = NULL;
 +
 + done:
 +  SMARTLIST_FOREACH(items, char*, s, tor_free(s));
 +  smartlist_free(items);
 +  tor_free(addrport);
 +  tor_free(fingerprint);
 +
 +  return bridge_line;
 +}
 +
 +/** Read the contents of a ClientTransportPlugin or ServerTransportPlugin
 + * line from <b>line</b>, depending on the value of <b>server</b>. Return 0
 + * if the line is well-formed, and -1 if it isn't.
 + *
 + * If <b>validate_only</b> is 0, the line is well-formed, and the transport is
 + * needed by some bridge:
 + * - If it's an external proxy line, add the transport described in the line to
 + * our internal transport list.
 + * - If it's a managed proxy line, launch the managed proxy.
 + */
 +
 +STATIC int
 +parse_transport_line(const or_options_t *options,
 +                     const char *line, int validate_only,
 +                     int server)
 +{
 +
 +  smartlist_t *items = NULL;
 +  int r;
 +  const char *transports = NULL;
 +  smartlist_t *transport_list = NULL;
 +  char *type = NULL;
 +  char *addrport = NULL;
 +  tor_addr_t addr;
 +  uint16_t port = 0;
 +  int socks_ver = PROXY_NONE;
 +
 +  /* managed proxy options */
 +  int is_managed = 0;
 +  char **proxy_argv = NULL;
 +  char **tmp = NULL;
 +  int proxy_argc, i;
 +  int is_useless_proxy = 1;
 +
 +  int line_length;
 +
 +  /* Split the line into space-separated tokens */
 +  items = smartlist_new();
 +  smartlist_split_string(items, line, NULL,
 +                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
 +  line_length = smartlist_len(items);
 +
 +  if (line_length < 3) {
 +    log_warn(LD_CONFIG,
 +             "Too few arguments on %sTransportPlugin line.",
 +             server ? "Server" : "Client");
 +    goto err;
 +  }
 +
 +  /* Get the first line element, split it to commas into
 +     transport_list (in case it's multiple transports) and validate
 +     the transport names. */
 +  transports = smartlist_get(items, 0);
 +  transport_list = smartlist_new();
 +  smartlist_split_string(transport_list, transports, ",",
 +                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
 +  SMARTLIST_FOREACH_BEGIN(transport_list, const char *, transport_name) {
 +    /* validate transport names */
 +    if (!string_is_C_identifier(transport_name)) {
 +      log_warn(LD_CONFIG, "Transport name is not a C identifier (%s).",
 +               transport_name);
 +      goto err;
 +    }
 +
 +    /* see if we actually need the transports provided by this proxy */
 +    if (!validate_only && transport_is_needed(transport_name))
 +      is_useless_proxy = 0;
 +  } SMARTLIST_FOREACH_END(transport_name);
 +
 +  type = smartlist_get(items, 1);
 +  if (!strcmp(type, "exec")) {
 +    is_managed = 1;
 +  } else if (server && !strcmp(type, "proxy")) {
 +    /* 'proxy' syntax only with ServerTransportPlugin */
 +    is_managed = 0;
 +  } else if (!server && !strcmp(type, "socks4")) {
 +    /* 'socks4' syntax only with ClientTransportPlugin */
 +    is_managed = 0;
 +    socks_ver = PROXY_SOCKS4;
 +  } else if (!server && !strcmp(type, "socks5")) {
 +    /* 'socks5' syntax only with ClientTransportPlugin */
 +    is_managed = 0;
 +    socks_ver = PROXY_SOCKS5;
 +  } else {
 +    log_warn(LD_CONFIG,
 +             "Strange %sTransportPlugin type '%s'",
 +             server ? "Server" : "Client", type);
 +    goto err;
 +  }
 +
 +  if (is_managed && options->Sandbox) {
 +    log_warn(LD_CONFIG,
 +             "Managed proxies are not compatible with Sandbox mode."
 +             "(%sTransportPlugin line was %s)",
 +             server ? "Server" : "Client", escaped(line));
 +    goto err;
 +  }
 +
 +  if (is_managed && options->NoExec) {
 +    log_warn(LD_CONFIG,
 +             "Managed proxies are not compatible with NoExec mode; ignoring."
 +             "(%sTransportPlugin line was %s)",
 +             server ? "Server" : "Client", escaped(line));
 +    r = 0;
 +    goto done;
 +  }
 +
 +  if (is_managed) {
 +    /* managed */
 +
 +    if (!server && !validate_only && is_useless_proxy) {
 +      log_info(LD_GENERAL,
 +               "Pluggable transport proxy (%s) does not provide "
 +               "any needed transports and will not be launched.",
 +               line);
 +    }
 +
 +    /*
 +     * If we are not just validating, use the rest of the line as the
 +     * argv of the proxy to be launched. Also, make sure that we are
 +     * only launching proxies that contribute useful transports.
 +     */
 +
 +    if (!validate_only && (server || !is_useless_proxy)) {
 +      proxy_argc = line_length - 2;
 +      tor_assert(proxy_argc > 0);
 +      proxy_argv = tor_calloc((proxy_argc + 1), sizeof(char *));
 +      tmp = proxy_argv;
 +
 +      for (i = 0; i < proxy_argc; i++) {
 +        /* store arguments */
 +        *tmp++ = smartlist_get(items, 2);
 +        smartlist_del_keeporder(items, 2);
 +      }
 +      *tmp = NULL; /* terminated with NULL, just like execve() likes it */
 +
 +      /* kickstart the thing */
 +      if (server) {
 +        pt_kickstart_server_proxy(transport_list, proxy_argv);
 +      } else {
 +        pt_kickstart_client_proxy(transport_list, proxy_argv);
 +      }
 +    }
 +  } else {
 +    /* external */
 +
 +    /* ClientTransportPlugins connecting through a proxy is managed only. */
 +    if (!server && (options->Socks4Proxy || options->Socks5Proxy ||
 +                    options->HTTPSProxy)) {
 +      log_warn(LD_CONFIG, "You have configured an external proxy with another "
 +                          "proxy type. (Socks4Proxy|Socks5Proxy|HTTPSProxy)");
 +      goto err;
 +    }
 +
 +    if (smartlist_len(transport_list) != 1) {
 +      log_warn(LD_CONFIG,
 +               "You can't have an external proxy with more than "
 +               "one transport.");
 +      goto err;
 +    }
 +
 +    addrport = smartlist_get(items, 2);
 +
 +    if (tor_addr_port_lookup(addrport, &addr, &port) < 0) {
 +      log_warn(LD_CONFIG,
 +               "Error parsing transport address '%s'", addrport);
 +      goto err;
 +    }
 +
 +    if (!port) {
 +      log_warn(LD_CONFIG,
 +               "Transport address '%s' has no port.", addrport);
 +      goto err;
 +    }
 +
 +    if (!validate_only) {
 +      log_info(LD_DIR, "%s '%s' at %s.",
 +               server ? "Server transport" : "Transport",
 +               transports, fmt_addrport(&addr, port));
 +
 +      if (!server) {
 +        transport_add_from_config(&addr, port,
 +                                  smartlist_get(transport_list, 0),
 +                                  socks_ver);
 +      }
 +    }
 +  }
 +
 +  r = 0;
 +  goto done;
 +
 + err:
 +  r = -1;
 +
 + done:
 +  SMARTLIST_FOREACH(items, char*, s, tor_free(s));
 +  smartlist_free(items);
 +  if (transport_list) {
 +    SMARTLIST_FOREACH(transport_list, char*, s, tor_free(s));
 +    smartlist_free(transport_list);
 +  }
 +
 +  return r;
 +}
 +
 +/** Given a ServerTransportListenAddr <b>line</b>, return its
 + *  <address:port> string. Return NULL if the line was not
 + *  well-formed.
 + *
 + *  If <b>transport</b> is set, return NULL if the line is not
 + *  referring to <b>transport</b>.
 + *
 + *  The returned string is allocated on the heap and it's the
 + *  responsibility of the caller to free it. */
 +static char *
 +get_bindaddr_from_transport_listen_line(const char *line,const char *transport)
 +{
 +  smartlist_t *items = NULL;
 +  const char *parsed_transport = NULL;
 +  char *addrport = NULL;
 +  tor_addr_t addr;
 +  uint16_t port = 0;
 +
 +  items = smartlist_new();
 +  smartlist_split_string(items, line, NULL,
 +                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
 +
 +  if (smartlist_len(items) < 2) {
 +    log_warn(LD_CONFIG,"Too few arguments on ServerTransportListenAddr line.");
 +    goto err;
 +  }
 +
 +  parsed_transport = smartlist_get(items, 0);
 +  addrport = tor_strdup(smartlist_get(items, 1));
 +
 +  /* If 'transport' is given, check if it matches the one on the line */
 +  if (transport && strcmp(transport, parsed_transport))
 +    goto err;
 +
 +  /* Validate addrport */
 +  if (tor_addr_port_parse(LOG_WARN, addrport, &addr, &port, -1)<0) {
 +    log_warn(LD_CONFIG, "Error parsing ServerTransportListenAddr "
 +             "address '%s'", addrport);
 +    goto err;
 +  }
 +
 +  goto done;
 +
 + err:
 +  tor_free(addrport);
 +  addrport = NULL;
 +
 + done:
 +  SMARTLIST_FOREACH(items, char*, s, tor_free(s));
 +  smartlist_free(items);
 +
 +  return addrport;
 +}
 +
 +/** Given a ServerTransportOptions <b>line</b>, return a smartlist
 + *  with the options. Return NULL if the line was not well-formed.
 + *
 + *  If <b>transport</b> is set, return NULL if the line is not
 + *  referring to <b>transport</b>.
 + *
 + *  The returned smartlist and its strings are allocated on the heap
 + *  and it's the responsibility of the caller to free it. */
 +smartlist_t *
 +get_options_from_transport_options_line(const char *line,const char *transport)
 +{
 +  smartlist_t *items = smartlist_new();
 +  smartlist_t *options = smartlist_new();
 +  const char *parsed_transport = NULL;
 +
 +  smartlist_split_string(items, line, NULL,
 +                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
 +
 +  if (smartlist_len(items) < 2) {
 +    log_warn(LD_CONFIG,"Too few arguments on ServerTransportOptions line.");
 +    goto err;
 +  }
 +
 +  parsed_transport = smartlist_get(items, 0);
 +  /* If 'transport' is given, check if it matches the one on the line */
 +  if (transport && strcmp(transport, parsed_transport))
 +    goto err;
 +
 +  SMARTLIST_FOREACH_BEGIN(items, const char *, option) {
 +    if (option_sl_idx == 0) /* skip the transport field (first field)*/
 +      continue;
 +
 +    /* validate that it's a k=v value */
 +    if (!string_is_key_value(LOG_WARN, option)) {
 +      log_warn(LD_CONFIG, "%s is not a k=v value.", escaped(option));
 +      goto err;
 +    }
 +
 +    /* add it to the options smartlist */
 +    smartlist_add_strdup(options, option);
 +    log_debug(LD_CONFIG, "Added %s to the list of options", escaped(option));
 +  } SMARTLIST_FOREACH_END(option);
 +
 +  goto done;
 +
 + err:
 +  SMARTLIST_FOREACH(options, char*, s, tor_free(s));
 +  smartlist_free(options);
 +  options = NULL;
 +
 + done:
 +  SMARTLIST_FOREACH(items, char*, s, tor_free(s));
 +  smartlist_free(items);
 +
 +  return options;
 +}
 +
 +/** Given the name of a pluggable transport in <b>transport</b>, check
 + *  the configuration file to see if the user has explicitly asked for
 + *  it to listen on a specific port. Return a <address:port> string if
 + *  so, otherwise NULL. */
 +char *
 +get_transport_bindaddr_from_config(const char *transport)
 +{
 +  config_line_t *cl;
 +  const or_options_t *options = get_options();
 +
 +  for (cl = options->ServerTransportListenAddr; cl; cl = cl->next) {
 +    char *bindaddr =
 +      get_bindaddr_from_transport_listen_line(cl->value, transport);
 +    if (bindaddr)
 +      return bindaddr;
 +  }
 +
 +  return NULL;
 +}
 +
 +/** Given the name of a pluggable transport in <b>transport</b>, check
 + *  the configuration file to see if the user has asked us to pass any
 + *  parameters to the pluggable transport. Return a smartlist
 + *  containing the parameters, otherwise NULL. */
 +smartlist_t *
 +get_options_for_server_transport(const char *transport)
 +{
 +  config_line_t *cl;
 +  const or_options_t *options = get_options();
 +
 +  for (cl = options->ServerTransportOptions; cl; cl = cl->next) {
 +    smartlist_t *options_sl =
 +      get_options_from_transport_options_line(cl->value, transport);
 +    if (options_sl)
 +      return options_sl;
 +  }
 +
 +  return NULL;
 +}
 +
 +/** Read the contents of a DirAuthority line from <b>line</b>. If
 + * <b>validate_only</b> is 0, and the line is well-formed, and it
 + * shares any bits with <b>required_type</b> or <b>required_type</b>
 + * is NO_DIRINFO (zero), then add the dirserver described in the line
 + * (minus whatever bits it's missing) as a valid authority.
 + * Return 0 on success or filtering out by type,
 + * or -1 if the line isn't well-formed or if we can't add it. */
 +STATIC int
 +parse_dir_authority_line(const char *line, dirinfo_type_t required_type,
 +                         int validate_only)
 +{
 +  smartlist_t *items = NULL;
 +  int r;
 +  char *addrport=NULL, *address=NULL, *nickname=NULL, *fingerprint=NULL;
 +  tor_addr_port_t ipv6_addrport, *ipv6_addrport_ptr = NULL;
 +  uint16_t dir_port = 0, or_port = 0;
 +  char digest[DIGEST_LEN];
 +  char v3_digest[DIGEST_LEN];
 +  dirinfo_type_t type = 0;
 +  double weight = 1.0;
 +
 +  memset(v3_digest, 0, sizeof(v3_digest));
 +
 +  items = smartlist_new();
 +  smartlist_split_string(items, line, NULL,
 +                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
 +  if (smartlist_len(items) < 1) {
 +    log_warn(LD_CONFIG, "No arguments on DirAuthority line.");
 +    goto err;
 +  }
 +
 +  if (is_legal_nickname(smartlist_get(items, 0))) {
 +    nickname = smartlist_get(items, 0);
 +    smartlist_del_keeporder(items, 0);
 +  }
 +
 +  while (smartlist_len(items)) {
 +    char *flag = smartlist_get(items, 0);
 +    if (TOR_ISDIGIT(flag[0]))
 +      break;
 +    if (!strcasecmp(flag, "hs") ||
 +               !strcasecmp(flag, "no-hs")) {
 +      log_warn(LD_CONFIG, "The DirAuthority options 'hs' and 'no-hs' are "
 +               "obsolete; you don't need them any more.");
 +    } else if (!strcasecmp(flag, "bridge")) {
 +      type |= BRIDGE_DIRINFO;
 +    } else if (!strcasecmp(flag, "no-v2")) {
 +      /* obsolete, but may still be contained in DirAuthority lines generated
 +         by various tools */;
 +    } else if (!strcasecmpstart(flag, "orport=")) {
 +      int ok;
 +      char *portstring = flag + strlen("orport=");
 +      or_port = (uint16_t) tor_parse_long(portstring, 10, 1, 65535, &ok, NULL);
 +      if (!ok)
 +        log_warn(LD_CONFIG, "Invalid orport '%s' on DirAuthority line.",
 +                 portstring);
 +    } else if (!strcmpstart(flag, "weight=")) {
 +      int ok;
 +      const char *wstring = flag + strlen("weight=");
 +      weight = tor_parse_double(wstring, 0, (double)UINT64_MAX, &ok, NULL);
 +      if (!ok) {
 +        log_warn(LD_CONFIG, "Invalid weight '%s' on DirAuthority line.",flag);
 +        weight=1.0;
 +      }
 +    } else if (!strcasecmpstart(flag, "v3ident=")) {
 +      char *idstr = flag + strlen("v3ident=");
 +      if (strlen(idstr) != HEX_DIGEST_LEN ||
 +          base16_decode(v3_digest, DIGEST_LEN,
 +                        idstr, HEX_DIGEST_LEN) != DIGEST_LEN) {
 +        log_warn(LD_CONFIG, "Bad v3 identity digest '%s' on DirAuthority line",
 +                 flag);
 +      } else {
 +        type |= V3_DIRINFO|EXTRAINFO_DIRINFO|MICRODESC_DIRINFO;
 +      }
 +    } else if (!strcasecmpstart(flag, "ipv6=")) {
 +      if (ipv6_addrport_ptr) {
 +        log_warn(LD_CONFIG, "Redundant ipv6 addr/port on DirAuthority line");
 +      } else {
 +        if (tor_addr_port_parse(LOG_WARN, flag+strlen("ipv6="),
 +                                &ipv6_addrport.addr, &ipv6_addrport.port,
 +                                -1) < 0
 +            || tor_addr_family(&ipv6_addrport.addr) != AF_INET6) {
 +          log_warn(LD_CONFIG, "Bad ipv6 addr/port %s on DirAuthority line",
 +                   escaped(flag));
 +          goto err;
 +        }
 +        ipv6_addrport_ptr = &ipv6_addrport;
 +      }
 +    } else {
 +      log_warn(LD_CONFIG, "Unrecognized flag '%s' on DirAuthority line",
 +               flag);
 +    }
 +    tor_free(flag);
 +    smartlist_del_keeporder(items, 0);
 +  }
 +
 +  if (smartlist_len(items) < 2) {
 +    log_warn(LD_CONFIG, "Too few arguments to DirAuthority line.");
 +    goto err;
 +  }
 +  addrport = smartlist_get(items, 0);
 +  smartlist_del_keeporder(items, 0);
 +
 +  if (tor_addr_port_split(LOG_WARN, addrport, &address, &dir_port) < 0) {
 +    log_warn(LD_CONFIG, "Error parsing DirAuthority address '%s'.", addrport);
 +    goto err;
 +  }
 +
 +  if (!string_is_valid_ipv4_address(address)) {
 +    log_warn(LD_CONFIG, "Error parsing DirAuthority address '%s' "
 +                        "(invalid IPv4 address)", address);
 +    goto err;
 +  }
 +
 +  if (!dir_port) {
 +    log_warn(LD_CONFIG, "Missing port in DirAuthority address '%s'",addrport);
 +    goto err;
 +  }
 +
 +  fingerprint = smartlist_join_strings(items, "", 0, NULL);
 +  if (strlen(fingerprint) != HEX_DIGEST_LEN) {
 +    log_warn(LD_CONFIG, "Key digest '%s' for DirAuthority is wrong length %d.",
 +             fingerprint, (int)strlen(fingerprint));
 +    goto err;
 +  }
 +  if (base16_decode(digest, DIGEST_LEN,
 +                    fingerprint, HEX_DIGEST_LEN) != DIGEST_LEN) {
 +    log_warn(LD_CONFIG, "Unable to decode DirAuthority key digest.");
 +    goto err;
 +  }
 +
 +  if (!validate_only && (!required_type || required_type & type)) {
 +    dir_server_t *ds;
 +    if (required_type)
 +      type &= required_type; /* pare down what we think of them as an
 +                              * authority for. */
 +    log_debug(LD_DIR, "Trusted %d dirserver at %s:%d (%s)", (int)type,
 +              address, (int)dir_port, (char*)smartlist_get(items,0));
 +    if (!(ds = trusted_dir_server_new(nickname, address, dir_port, or_port,
 +                                      ipv6_addrport_ptr,
 +                                      digest, v3_digest, type, weight)))
 +      goto err;
 +    dir_server_add(ds);
 +  }
 +
 +  r = 0;
 +  goto done;
 +
 +  err:
 +  r = -1;
 +
 +  done:
 +  SMARTLIST_FOREACH(items, char*, s, tor_free(s));
 +  smartlist_free(items);
 +  tor_free(addrport);
 +  tor_free(address);
 +  tor_free(nickname);
 +  tor_free(fingerprint);
 +  return r;
 +}
 +
 +/** Read the contents of a FallbackDir line from <b>line</b>. If
 + * <b>validate_only</b> is 0, and the line is well-formed, then add the
 + * dirserver described in the line as a fallback directory. Return 0 on
 + * success, or -1 if the line isn't well-formed or if we can't add it. */
 +int
 +parse_dir_fallback_line(const char *line,
 +                        int validate_only)
 +{
 +  int r = -1;
 +  smartlist_t *items = smartlist_new(), *positional = smartlist_new();
 +  int orport = -1;
 +  uint16_t dirport;
 +  tor_addr_t addr;
 +  int ok;
 +  char id[DIGEST_LEN];
 +  char *address=NULL;
 +  tor_addr_port_t ipv6_addrport, *ipv6_addrport_ptr = NULL;
 +  double weight=1.0;
 +
 +  memset(id, 0, sizeof(id));
 +  smartlist_split_string(items, line, NULL,
 +                         SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
 +  SMARTLIST_FOREACH_BEGIN(items, const char *, cp) {
 +    const char *eq = strchr(cp, '=');
 +    ok = 1;
 +    if (! eq) {
 +      smartlist_add(positional, (char*)cp);
 +      continue;
 +    }
 +    if (!strcmpstart(cp, "orport=")) {
 +      orport = (int)tor_parse_long(cp+strlen("orport="), 10,
 +                                   1, 65535, &ok, NULL);
 +    } else if (!strcmpstart(cp, "id=")) {
 +      ok = base16_decode(id, DIGEST_LEN, cp+strlen("id="),
 +                         strlen(cp)-strlen("id=")) == DIGEST_LEN;
 +    } else if (!strcasecmpstart(cp, "ipv6=")) {
 +      if (ipv6_addrport_ptr) {
 +        log_warn(LD_CONFIG, "Redundant ipv6 addr/port on FallbackDir line");
 +      } else {
 +        if (tor_addr_port_parse(LOG_WARN, cp+strlen("ipv6="),
 +                                &ipv6_addrport.addr, &ipv6_addrport.port,
 +                                -1) < 0
 +            || tor_addr_family(&ipv6_addrport.addr) != AF_INET6) {
 +          log_warn(LD_CONFIG, "Bad ipv6 addr/port %s on FallbackDir line",
 +                   escaped(cp));
 +          goto end;
 +        }
 +        ipv6_addrport_ptr = &ipv6_addrport;
 +      }
 +    } else if (!strcmpstart(cp, "weight=")) {
 +      int num_ok;
 +      const char *wstring = cp + strlen("weight=");
 +      weight = tor_parse_double(wstring, 0, (double)UINT64_MAX, &num_ok, NULL);
 +      if (!num_ok) {
 +        log_warn(LD_CONFIG, "Invalid weight '%s' on FallbackDir line.", cp);
 +        weight=1.0;
 +      }
 +    }
 +
 +    if (!ok) {
 +      log_warn(LD_CONFIG, "Bad FallbackDir option %s", escaped(cp));
 +      goto end;
 +    }
 +  } SMARTLIST_FOREACH_END(cp);
 +
 +  if (smartlist_len(positional) != 1) {
 +    log_warn(LD_CONFIG, "Couldn't parse FallbackDir line %s", escaped(line));
 +    goto end;
 +  }
 +
 +  if (tor_digest_is_zero(id)) {
 +    log_warn(LD_CONFIG, "Missing identity on FallbackDir line");
 +    goto end;
 +  }
 +
 +  if (orport <= 0) {
 +    log_warn(LD_CONFIG, "Missing orport on FallbackDir line");
 +    goto end;
 +  }
 +
 +  if (tor_addr_port_split(LOG_INFO, smartlist_get(positional, 0),
 +                          &address, &dirport) < 0 ||
 +      tor_addr_parse(&addr, address)<0) {
 +    log_warn(LD_CONFIG, "Couldn't parse address:port %s on FallbackDir line",
 +             (const char*)smartlist_get(positional, 0));
 +    goto end;
 +  }
 +
 +  if (!validate_only) {
 +    dir_server_t *ds;
 +    ds = fallback_dir_server_new(&addr, dirport, orport, ipv6_addrport_ptr,
 +                                 id, weight);
 +    if (!ds) {
 +      log_warn(LD_CONFIG, "Couldn't create FallbackDir %s", escaped(line));
 +      goto end;
 +    }
 +    dir_server_add(ds);
 +  }
 +
 +  r = 0;
 +
 + end:
 +  SMARTLIST_FOREACH(items, char *, cp, tor_free(cp));
 +  smartlist_free(items);
 +  smartlist_free(positional);
 +  tor_free(address);
 +  return r;
 +}
 +
 +/** Allocate and return a new port_cfg_t with reasonable defaults. */
 +STATIC port_cfg_t *
 +port_cfg_new(size_t namelen)
 +{
 +  tor_assert(namelen <= SIZE_T_CEILING - sizeof(port_cfg_t) - 1);
 +  port_cfg_t *cfg = tor_malloc_zero(sizeof(port_cfg_t) + namelen + 1);
 +  cfg->entry_cfg.ipv4_traffic = 1;
 +  cfg->entry_cfg.ipv6_traffic = 1;
 +  cfg->entry_cfg.dns_request = 1;
 +  cfg->entry_cfg.onion_traffic = 1;
 +  cfg->entry_cfg.prefer_ipv6_virtaddr = 1;
 +  return cfg;
 +}
 +
 +/** Free all storage held in <b>port</b> */
 +STATIC void
 +port_cfg_free_(port_cfg_t *port)
 +{
 +  tor_free(port);
 +}
 +
 +/** Warn for every port in <b>ports</b> of type <b>listener_type</b> that is
 + * on a publicly routable address. */
 +static void
 +warn_nonlocal_client_ports(const smartlist_t *ports,
 +                           const char *portname,
 +                           const int listener_type)
 +{
 +  SMARTLIST_FOREACH_BEGIN(ports, const port_cfg_t *, port) {
 +    if (port->type != listener_type)
 +      continue;
 +    if (port->is_unix_addr) {
 +      /* Unix sockets aren't accessible over a network. */
 +    } else if (!tor_addr_is_internal(&port->addr, 1)) {
 +      log_warn(LD_CONFIG, "You specified a public address '%s' for %sPort. "
 +               "Other people on the Internet might find your computer and "
 +               "use it as an open proxy. Please don't allow this unless you "
 +               "have a good reason.",
 +               fmt_addrport(&port->addr, port->port), portname);
 +    } else if (!tor_addr_is_loopback(&port->addr)) {
 +      log_notice(LD_CONFIG, "You configured a non-loopback address '%s' "
 +                 "for %sPort. This allows everybody on your local network to "
 +                 "use your machine as a proxy. Make sure this is what you "
 +                 "wanted.",
 +                 fmt_addrport(&port->addr, port->port), portname);
 +    }
 +  } SMARTLIST_FOREACH_END(port);
 +}
 +
 +/** Warn for every Extended ORPort port in <b>ports</b> that is on a
 + *  publicly routable address. */
 +static void
 +warn_nonlocal_ext_orports(const smartlist_t *ports, const char *portname)
 +{
 +  SMARTLIST_FOREACH_BEGIN(ports, const port_cfg_t *, port) {
 +    if (port->type != CONN_TYPE_EXT_OR_LISTENER)
 +      continue;
 +    if (port->is_unix_addr)
 +      continue;
 +    /* XXX maybe warn even if address is RFC1918? */
 +    if (!tor_addr_is_internal(&port->addr, 1)) {
 +      log_warn(LD_CONFIG, "You specified a public address '%s' for %sPort. "
 +               "This is not advised; this address is supposed to only be "
 +               "exposed on localhost so that your pluggable transport "
 +               "proxies can connect to it.",
 +               fmt_addrport(&port->addr, port->port), portname);
 +    }
 +  } SMARTLIST_FOREACH_END(port);
 +}
 +
 +/** Given a list of port_cfg_t in <b>ports</b>, warn if any controller port
 + * there is listening on any non-loopback address.  If <b>forbid_nonlocal</b>
 + * is true, then emit a stronger warning and remove the port from the list.
 + */
 +static void
 +warn_nonlocal_controller_ports(smartlist_t *ports, unsigned forbid_nonlocal)
 +{
 +  int warned = 0;
 +  SMARTLIST_FOREACH_BEGIN(ports, port_cfg_t *, port) {
 +    if (port->type != CONN_TYPE_CONTROL_LISTENER)
 +      continue;
 +    if (port->is_unix_addr)
 +      continue;
 +    if (!tor_addr_is_loopback(&port->addr)) {
 +      if (forbid_nonlocal) {
 +        if (!warned)
 +          log_warn(LD_CONFIG,
 +                 "You have a ControlPort set to accept "
 +                 "unauthenticated connections from a non-local address.  "
 +                 "This means that programs not running on your computer "
 +                 "can reconfigure your Tor, without even having to guess a "
 +                 "password.  That's so bad that I'm closing your ControlPort "
 +                 "for you.  If you need to control your Tor remotely, try "
 +                 "enabling authentication and using a tool like stunnel or "
 +                 "ssh to encrypt remote access.");
 +        warned = 1;
 +        port_cfg_free(port);
 +        SMARTLIST_DEL_CURRENT(ports, port);
 +      } else {
 +        log_warn(LD_CONFIG, "You have a ControlPort set to accept "
 +                 "connections from a non-local address.  This means that "
 +                 "programs not running on your computer can reconfigure your "
 +                 "Tor.  That's pretty bad, since the controller "
 +                 "protocol isn't encrypted!  Maybe you should just listen on "
 +                 "127.0.0.1 and use a tool like stunnel or ssh to encrypt "
 +                 "remote connections to your control port.");
 +        return; /* No point in checking the rest */
 +      }
 +    }
 +  } SMARTLIST_FOREACH_END(port);
 +}
 +
 +/**
 + * Take a string (<b>line</b>) that begins with either an address:port, a
 + * port, or an AF_UNIX address, optionally quoted, prefixed with
 + * "unix:". Parse that line, and on success, set <b>addrport_out</b> to a new
 + * string containing the beginning portion (without prefix).  Iff there was a
 + * unix: prefix, set <b>is_unix_out</b> to true.  On success, also set
 + * <b>rest_out</b> to point to the part of the line after the address portion.
 + *
 + * Return 0 on success, -1 on failure.
 + */
 +int
 +port_cfg_line_extract_addrport(const char *line,
 +                               char **addrport_out,
 +                               int *is_unix_out,
 +                               const char **rest_out)
 +{
 +  tor_assert(line);
 +  tor_assert(addrport_out);
 +  tor_assert(is_unix_out);
 +  tor_assert(rest_out);
 +
 +  line = eat_whitespace(line);
 +
 +  if (!strcmpstart(line, unix_q_socket_prefix)) {
 +    // It starts with unix:"
 +    size_t sz;
 +    *is_unix_out = 1;
 +    *addrport_out = NULL;
 +    line += strlen(unix_socket_prefix); /*No q: Keep the quote */
 +    *rest_out = unescape_string(line, addrport_out, &sz);
 +    if (!*rest_out || (*addrport_out && sz != strlen(*addrport_out))) {
 +      tor_free(*addrport_out);
 +      return -1;
 +    }
 +    *rest_out = eat_whitespace(*rest_out);
 +    return 0;
 +  } else {
 +    // Is there a unix: prefix?
 +    if (!strcmpstart(line, unix_socket_prefix)) {
 +      line += strlen(unix_socket_prefix);
 +      *is_unix_out = 1;
 +    } else {
 +      *is_unix_out = 0;
 +    }
 +
 +    const char *end = find_whitespace(line);
 +    if (BUG(!end)) {
 +      end = strchr(line, '\0'); // LCOV_EXCL_LINE -- this can't be NULL
 +    }
 +    tor_assert(end && end >= line);
 +    *addrport_out = tor_strndup(line, end - line);
 +    *rest_out = eat_whitespace(end);
 +    return 0;
 +  }
 +}
 +
 +static void
 +warn_client_dns_cache(const char *option, int disabling)
 +{
 +  if (disabling)
 +    return;
 +
 +  warn_deprecated_option(option,
 +      "Client-side DNS cacheing enables a wide variety of route-"
 +      "capture attacks. If a single bad exit node lies to you about "
 +      "an IP address, cacheing that address would make you visit "
 +      "an address of the attacker's choice every time you connected "
 +      "to your destination.");
 +}
 +
 +/**
 + * Validate the configured bridge distribution method from a BridgeDistribution
 + * config line.
 + *
 + * The input <b>bd</b>, is a string taken from the BridgeDistribution config
 + * line (if present).  If the option wasn't set, return 0 immediately.  The
 + * BridgeDistribution option is then validated.  Currently valid, recognised
 + * options are:
 + *
 + * - "none"
 + * - "any"
 + * - "https"
 + * - "email"
 + * - "moat"
 + * - "hyphae"
 + *
 + * If the option string is unrecognised, a warning will be logged and 0 is
 + * returned.  If the option string contains an invalid character, -1 is
 + * returned.
 + **/
 +STATIC int
 +check_bridge_distribution_setting(const char *bd)
 +{
 +  if (bd == NULL)
 +    return 0;
 +
 +  const char *RECOGNIZED[] = {
 +    "none", "any", "https", "email", "moat", "hyphae"
 +  };
 +  unsigned i;
 +  for (i = 0; i < ARRAY_LENGTH(RECOGNIZED); ++i) {
 +    if (!strcmp(bd, RECOGNIZED[i]))
 +      return 0;
 +  }
 +
 +  const char *cp = bd;
 +  //  Method = (KeywordChar | "_") +
 +  while (TOR_ISALNUM(*cp) || *cp == '-' || *cp == '_')
 +    ++cp;
 +
 +  if (*cp == 0) {
 +    log_warn(LD_CONFIG, "Unrecognized BridgeDistribution value %s. I'll "
 +           "assume you know what you are doing...", escaped(bd));
 +    return 0; // we reached the end of the string; all is well
 +  } else {
 +    return -1; // we found a bad character in the string.
 +  }
 +}
 +
 +/**
 + * Parse port configuration for a single port type.
 + *
 + * Read entries of the "FooPort" type from the list <b>ports</b>.  Syntax is
 + * that FooPort can have any number of entries of the format
 + *  "[Address:][Port] IsolationOptions".
 + *
 + * In log messages, describe the port type as <b>portname</b>.
 + *
 + * If no address is specified, default to <b>defaultaddr</b>.  If no
 + * FooPort is given, default to defaultport (if 0, there is no default).
 + *
 + * If CL_PORT_NO_STREAM_OPTIONS is set in <b>flags</b>, do not allow stream
 + * isolation options in the FooPort entries.
 + *
 + * If CL_PORT_WARN_NONLOCAL is set in <b>flags</b>, warn if any of the
 + * ports are not on a local address.  If CL_PORT_FORBID_NONLOCAL is set,
 + * this is a control port with no password set: don't even allow it.
 + *
 + * If CL_PORT_SERVER_OPTIONS is set in <b>flags</b>, do not allow stream
 + * isolation options in the FooPort entries; instead allow the
 + * server-port option set.
 + *
 + * If CL_PORT_TAKES_HOSTNAMES is set in <b>flags</b>, allow the options
 + * {No,}IPv{4,6}Traffic.
 + *
 + * On success, if <b>out</b> is given, add a new port_cfg_t entry to
 + * <b>out</b> for every port that the client should listen on.  Return 0
 + * on success, -1 on failure.
 + */
 +STATIC int
 +parse_port_config(smartlist_t *out,
 +                  const config_line_t *ports,
 +                  const char *portname,
 +                  int listener_type,
 +                  const char *defaultaddr,
 +                  int defaultport,
 +                  const unsigned flags)
 +{
 +  smartlist_t *elts;
 +  int retval = -1;
 +  const unsigned is_control = (listener_type == CONN_TYPE_CONTROL_LISTENER);
 +  const unsigned is_ext_orport = (listener_type == CONN_TYPE_EXT_OR_LISTENER);
 +  const unsigned allow_no_stream_options = flags & CL_PORT_NO_STREAM_OPTIONS;
 +  const unsigned use_server_options = flags & CL_PORT_SERVER_OPTIONS;
 +  const unsigned warn_nonlocal = flags & CL_PORT_WARN_NONLOCAL;
 +  const unsigned forbid_nonlocal = flags & CL_PORT_FORBID_NONLOCAL;
 +  const unsigned default_to_group_writable =
 +    flags & CL_PORT_DFLT_GROUP_WRITABLE;
 +  const unsigned takes_hostnames = flags & CL_PORT_TAKES_HOSTNAMES;
 +  const unsigned is_unix_socket = flags & CL_PORT_IS_UNIXSOCKET;
 +  int got_zero_port=0, got_nonzero_port=0;
 +  char *unix_socket_path = NULL;
 +
 +  /* If there's no FooPort, then maybe make a default one. */
 +  if (! ports) {
 +    if (defaultport && defaultaddr && out) {
 +      port_cfg_t *cfg = port_cfg_new(is_unix_socket ? strlen(defaultaddr) : 0);
 +       cfg->type = listener_type;
 +       if (is_unix_socket) {
 +         tor_addr_make_unspec(&cfg->addr);
 +         memcpy(cfg->unix_addr, defaultaddr, strlen(defaultaddr) + 1);
 +         cfg->is_unix_addr = 1;
 +       } else {
 +         cfg->port = defaultport;
 +         tor_addr_parse(&cfg->addr, defaultaddr);
 +       }
 +       cfg->entry_cfg.session_group = SESSION_GROUP_UNSET;
 +       cfg->entry_cfg.isolation_flags = ISO_DEFAULT;
 +       smartlist_add(out, cfg);
 +    }
 +    return 0;
 +  }
 +
 +  /* At last we can actually parse the FooPort lines.  The syntax is:
 +   * [Addr:](Port|auto) [Options].*/
 +  elts = smartlist_new();
 +  char *addrport = NULL;
 +
 +  for (; ports; ports = ports->next) {
 +    tor_addr_t addr;
 +    tor_addr_make_unspec(&addr);
 +
 +    int port;
 +    int sessiongroup = SESSION_GROUP_UNSET;
 +    unsigned isolation = ISO_DEFAULT;
 +    int prefer_no_auth = 0;
 +    int socks_iso_keep_alive = 0;
 +
 +    uint16_t ptmp=0;
 +    int ok;
 +    /* This must be kept in sync with port_cfg_new's defaults */
 +    int no_listen = 0, no_advertise = 0, all_addrs = 0,
 +      bind_ipv4_only = 0, bind_ipv6_only = 0,
 +      ipv4_traffic = 1, ipv6_traffic = 1, prefer_ipv6 = 0, dns_request = 1,
 +      onion_traffic = 1,
 +      cache_ipv4 = 0, use_cached_ipv4 = 0,
 +      cache_ipv6 = 0, use_cached_ipv6 = 0,
 +      prefer_ipv6_automap = 1, world_writable = 0, group_writable = 0,
 +      relax_dirmode_check = 0,
 +      has_used_unix_socket_only_option = 0;
 +
 +    int is_unix_tagged_addr = 0;
 +    const char *rest_of_line = NULL;
 +    if (port_cfg_line_extract_addrport(ports->value,
 +                          &addrport, &is_unix_tagged_addr, &rest_of_line)<0) {
 +      log_warn(LD_CONFIG, "Invalid %sPort line with unparsable address",
 +               portname);
 +      goto err;
 +    }
 +    if (strlen(addrport) == 0) {
 +      log_warn(LD_CONFIG, "Invalid %sPort line with no address", portname);
 +      goto err;
 +    }
 +
 +    /* Split the remainder... */
 +    smartlist_split_string(elts, rest_of_line, NULL,
 +                           SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
 +
 +    /* Let's start to check if it's a Unix socket path. */
 +    if (is_unix_tagged_addr) {
 +#ifndef HAVE_SYS_UN_H
 +      log_warn(LD_CONFIG, "Unix sockets not supported on this system.");
 +      goto err;
 +#endif
 +      unix_socket_path = addrport;
 +      addrport = NULL;
 +    }
 +
 +    if (unix_socket_path &&
 +        ! conn_listener_type_supports_af_unix(listener_type)) {
 +      log_warn(LD_CONFIG, "%sPort does not support unix sockets", portname);
 +      goto err;
 +    }
 +
 +    if (unix_socket_path) {
 +      port = 1;
 +    } else if (is_unix_socket) {
 +      if (BUG(!addrport))
 +        goto err; // LCOV_EXCL_LINE unreachable, but coverity can't tell that
 +      unix_socket_path = tor_strdup(addrport);
 +      if (!strcmp(addrport, "0"))
 +        port = 0;
 +      else
 +        port = 1;
 +    } else if (!strcasecmp(addrport, "auto")) {
 +      port = CFG_AUTO_PORT;
 +      int af = tor_addr_parse(&addr, defaultaddr);
 +      tor_assert(af >= 0);
 +    } else if (!strcasecmpend(addrport, ":auto")) {
 +      char *addrtmp = tor_strndup(addrport, strlen(addrport)-5);
 +      port = CFG_AUTO_PORT;
 +      if (tor_addr_port_lookup(addrtmp, &addr, &ptmp)<0 || ptmp) {
 +        log_warn(LD_CONFIG, "Invalid address '%s' for %sPort",
 +                 escaped(addrport), portname);
 +        tor_free(addrtmp);
 +        goto err;
 +      }
 +      tor_free(addrtmp);
 +    } else {
 +      /* Try parsing integer port before address, because, who knows?
 +         "9050" might be a valid address. */
 +      port = (int) tor_parse_long(addrport, 10, 0, 65535, &ok, NULL);
 +      if (ok) {
 +        int af = tor_addr_parse(&addr, defaultaddr);
 +        tor_assert(af >= 0);
 +      } else if (tor_addr_port_lookup(addrport, &addr, &ptmp) == 0) {
 +        if (ptmp == 0) {
 +          log_warn(LD_CONFIG, "%sPort line has address but no port", portname);
 +          goto err;
 +        }
 +        port = ptmp;
 +      } else {
 +        log_warn(LD_CONFIG, "Couldn't parse address %s for %sPort",
 +                 escaped(addrport), portname);
 +        goto err;
 +      }
 +    }
 +
 +    if (unix_socket_path && default_to_group_writable)
 +      group_writable = 1;
 +
 +    /* Now parse the rest of the options, if any. */
 +    if (use_server_options) {
 +      /* This is a server port; parse advertising options */
 +      SMARTLIST_FOREACH_BEGIN(elts, char *, elt) {
 +        if (!strcasecmp(elt, "NoAdvertise")) {
 +          no_advertise = 1;
 +        } else if (!strcasecmp(elt, "NoListen")) {
 +          no_listen = 1;
 +#if 0
 +        /* not implemented yet. */
 +        } else if (!strcasecmp(elt, "AllAddrs")) {
 +
 +          all_addrs = 1;
 +#endif /* 0 */
 +        } else if (!strcasecmp(elt, "IPv4Only")) {
 +          bind_ipv4_only = 1;
 +        } else if (!strcasecmp(elt, "IPv6Only")) {
 +          bind_ipv6_only = 1;
 +        } else {
 +          log_warn(LD_CONFIG, "Unrecognized %sPort option '%s'",
 +                   portname, escaped(elt));
 +        }
 +      } SMARTLIST_FOREACH_END(elt);
 +
 +      if (no_advertise && no_listen) {
 +        log_warn(LD_CONFIG, "Tried to set both NoListen and NoAdvertise "
 +                 "on %sPort line '%s'",
 +                 portname, escaped(ports->value));
 +        goto err;
 +      }
 +      if (bind_ipv4_only && bind_ipv6_only) {
 +        log_warn(LD_CONFIG, "Tried to set both IPv4Only and IPv6Only "
 +                 "on %sPort line '%s'",
 +                 portname, escaped(ports->value));
 +        goto err;
 +      }
-       if (bind_ipv4_only && tor_addr_family(&addr) == AF_INET6) {
-         log_warn(LD_CONFIG, "Could not interpret %sPort address as IPv6",
++      if (bind_ipv4_only && tor_addr_family(&addr) != AF_INET) {
++        log_warn(LD_CONFIG, "Could not interpret %sPort address as IPv4",
 +                 portname);
 +        goto err;
 +      }
-       if (bind_ipv6_only && tor_addr_family(&addr) == AF_INET) {
-         log_warn(LD_CONFIG, "Could not interpret %sPort address as IPv4",
++      if (bind_ipv6_only && tor_addr_family(&addr) != AF_INET6) {
++        log_warn(LD_CONFIG, "Could not interpret %sPort address as IPv6",
 +                 portname);
 +        goto err;
 +      }
 +    } else {
 +      /* This is a client port; parse isolation options */
 +      SMARTLIST_FOREACH_BEGIN(elts, char *, elt) {
 +        int no = 0, isoflag = 0;
 +        const char *elt_orig = elt;
 +
 +        if (!strcasecmpstart(elt, "SessionGroup=")) {
 +          int group = (int)tor_parse_long(elt+strlen("SessionGroup="),
 +                                          10, 0, INT_MAX, &ok, NULL);
 +          if (!ok || !allow_no_stream_options) {
 +            log_warn(LD_CONFIG, "Invalid %sPort option '%s'",
 +                     portname, escaped(elt));
 +            goto err;
 +          }
 +          if (sessiongroup >= 0) {
 +            log_warn(LD_CONFIG, "Multiple SessionGroup options on %sPort",
 +                     portname);
 +            goto err;
 +          }
 +          sessiongroup = group;
 +          continue;
 +        }
 +
 +        if (!strcasecmpstart(elt, "No")) {
 +          no = 1;
 +          elt += 2;
 +        }
 +
 +        if (!strcasecmp(elt, "GroupWritable")) {
 +          group_writable = !no;
 +          has_used_unix_socket_only_option = 1;
 +          continue;
 +        } else if (!strcasecmp(elt, "WorldWritable")) {
 +          world_writable = !no;
 +          has_used_unix_socket_only_option = 1;
 +          continue;
 +        } else if (!strcasecmp(elt, "RelaxDirModeCheck")) {
 +          relax_dirmode_check = !no;
 +          has_used_unix_socket_only_option = 1;
 +          continue;
 +        }
 +
 +        if (allow_no_stream_options) {
 +          log_warn(LD_CONFIG, "Unrecognized %sPort option '%s'",
 +                   portname, escaped(elt));
 +          continue;
 +        }
 +
 +        if (takes_hostnames) {
 +          if (!strcasecmp(elt, "IPv4Traffic")) {
 +            ipv4_traffic = ! no;
 +            continue;
 +          } else if (!strcasecmp(elt, "IPv6Traffic")) {
 +            ipv6_traffic = ! no;
 +            continue;
 +          } else if (!strcasecmp(elt, "PreferIPv6")) {
 +            prefer_ipv6 = ! no;
 +            continue;
 +          } else if (!strcasecmp(elt, "DNSRequest")) {
 +            dns_request = ! no;
 +            continue;
 +          } else if (!strcasecmp(elt, "OnionTraffic")) {
 +            onion_traffic = ! no;
 +            continue;
 +          } else if (!strcasecmp(elt, "OnionTrafficOnly")) {
 +            /* Only connect to .onion addresses.  Equivalent to
 +             * NoDNSRequest, NoIPv4Traffic, NoIPv6Traffic. The option
 +             * NoOnionTrafficOnly is not supported, it's too confusing. */
 +            if (no) {
 +              log_warn(LD_CONFIG, "Unsupported %sPort option 'No%s'. Use "
 +                       "DNSRequest, IPv4Traffic, and/or IPv6Traffic instead.",
 +                       portname, escaped(elt));
 +            } else {
 +              ipv4_traffic = ipv6_traffic = dns_request = 0;
 +            }
 +            continue;
 +          }
 +        }
 +        if (!strcasecmp(elt, "CacheIPv4DNS")) {
 +          warn_client_dns_cache(elt, no); // since 0.2.9.2-alpha
 +          cache_ipv4 = ! no;
 +          continue;
 +        } else if (!strcasecmp(elt, "CacheIPv6DNS")) {
 +          warn_client_dns_cache(elt, no); // since 0.2.9.2-alpha
 +          cache_ipv6 = ! no;
 +          continue;
 +        } else if (!strcasecmp(elt, "CacheDNS")) {
 +          warn_client_dns_cache(elt, no); // since 0.2.9.2-alpha
 +          cache_ipv4 = cache_ipv6 = ! no;
 +          continue;
 +        } else if (!strcasecmp(elt, "UseIPv4Cache")) {
 +          warn_client_dns_cache(elt, no); // since 0.2.9.2-alpha
 +          use_cached_ipv4 = ! no;
 +          continue;
 +        } else if (!strcasecmp(elt, "UseIPv6Cache")) {
 +          warn_client_dns_cache(elt, no); // since 0.2.9.2-alpha
 +          use_cached_ipv6 = ! no;
 +          continue;
 +        } else if (!strcasecmp(elt, "UseDNSCache")) {
 +          warn_client_dns_cache(elt, no); // since 0.2.9.2-alpha
 +          use_cached_ipv4 = use_cached_ipv6 = ! no;
 +          continue;
 +        } else if (!strcasecmp(elt, "PreferIPv6Automap")) {
 +          prefer_ipv6_automap = ! no;
 +          continue;
 +        } else if (!strcasecmp(elt, "PreferSOCKSNoAuth")) {
 +          prefer_no_auth = ! no;
 +          continue;
 +        } else if (!strcasecmp(elt, "KeepAliveIsolateSOCKSAuth")) {
 +          socks_iso_keep_alive = ! no;
 +          continue;
 +        }
 +
 +        if (!strcasecmpend(elt, "s"))
 +          elt[strlen(elt)-1] = '\0'; /* kill plurals. */
 +
 +        if (!strcasecmp(elt, "IsolateDestPort")) {
 +          isoflag = ISO_DESTPORT;
 +        } else if (!strcasecmp(elt, "IsolateDestAddr")) {
 +          isoflag = ISO_DESTADDR;
 +        } else if (!strcasecmp(elt, "IsolateSOCKSAuth")) {
 +          isoflag = ISO_SOCKSAUTH;
 +        } else if (!strcasecmp(elt, "IsolateClientProtocol")) {
 +          isoflag = ISO_CLIENTPROTO;
 +        } else if (!strcasecmp(elt, "IsolateClientAddr")) {
 +          isoflag = ISO_CLIENTADDR;
 +        } else {
 +          log_warn(LD_CONFIG, "Unrecognized %sPort option '%s'",
 +                   portname, escaped(elt_orig));
 +        }
 +
 +        if (no) {
 +          isolation &= ~isoflag;
 +        } else {
 +          isolation |= isoflag;
 +        }
 +      } SMARTLIST_FOREACH_END(elt);
 +    }
 +
 +    if (port)
 +      got_nonzero_port = 1;
 +    else
 +      got_zero_port = 1;
 +
 +    if (dns_request == 0 && listener_type == CONN_TYPE_AP_DNS_LISTENER) {
 +      log_warn(LD_CONFIG, "You have a %sPort entry with DNS disabled; that "
 +               "won't work.", portname);
 +      goto err;
 +    }
 +
 +    if (ipv4_traffic == 0 && ipv6_traffic == 0 && onion_traffic == 0
 +        && listener_type != CONN_TYPE_AP_DNS_LISTENER) {
 +      log_warn(LD_CONFIG, "You have a %sPort entry with all of IPv4 and "
 +               "IPv6 and .onion disabled; that won't work.", portname);
 +      goto err;
 +    }
 +
 +    if (dns_request == 1 && ipv4_traffic == 0 && ipv6_traffic == 0
 +        && listener_type != CONN_TYPE_AP_DNS_LISTENER) {
 +      log_warn(LD_CONFIG, "You have a %sPort entry with DNSRequest enabled, "
 +               "but IPv4 and IPv6 disabled; DNS-based sites won't work.",
 +               portname);
 +      goto err;
 +    }
 +
 +    if ( has_used_unix_socket_only_option && ! unix_socket_path) {
 +      log_warn(LD_CONFIG, "You have a %sPort entry with GroupWritable, "
 +               "WorldWritable, or RelaxDirModeCheck, but it is not a "
 +               "unix socket.", portname);
 +      goto err;
 +    }
 +
 +    if (!(isolation & ISO_SOCKSAUTH) && socks_iso_keep_alive) {
 +      log_warn(LD_CONFIG, "You have a %sPort entry with both "
 +               "NoIsolateSOCKSAuth and KeepAliveIsolateSOCKSAuth set.",
 +               portname);
 +      goto err;
 +    }
 +
 +    if (unix_socket_path && (isolation & ISO_CLIENTADDR)) {
 +      /* `IsolateClientAddr` is nonsensical in the context of AF_LOCAL.
 +       * just silently remove the isolation flag.
 +       */
 +      isolation &= ~ISO_CLIENTADDR;
 +    }
 +
 +    if (out && port) {
 +      size_t namelen = unix_socket_path ? strlen(unix_socket_path) : 0;
 +      port_cfg_t *cfg = port_cfg_new(namelen);
 +      if (unix_socket_path) {
 +        tor_addr_make_unspec(&cfg->addr);
 +        memcpy(cfg->unix_addr, unix_socket_path, namelen + 1);
 +        cfg->is_unix_addr = 1;
 +        tor_free(unix_socket_path);
 +      } else {
 +        tor_addr_copy(&cfg->addr, &addr);
 +        cfg->port = port;
 +      }
 +      cfg->type = listener_type;
 +      cfg->is_world_writable = world_writable;
 +      cfg->is_group_writable = group_writable;
 +      cfg->relax_dirmode_check = relax_dirmode_check;
 +      cfg->entry_cfg.isolation_flags = isolation;
 +      cfg->entry_cfg.session_group = sessiongroup;
 +      cfg->server_cfg.no_advertise = no_advertise;
 +      cfg->server_cfg.no_listen = no_listen;
 +      cfg->server_cfg.all_addrs = all_addrs;
 +      cfg->server_cfg.bind_ipv4_only = bind_ipv4_only;
 +      cfg->server_cfg.bind_ipv6_only = bind_ipv6_only;
 +      cfg->entry_cfg.ipv4_traffic = ipv4_traffic;
 +      cfg->entry_cfg.ipv6_traffic = ipv6_traffic;
 +      cfg->entry_cfg.prefer_ipv6 = prefer_ipv6;
 +      cfg->entry_cfg.dns_request = dns_request;
 +      cfg->entry_cfg.onion_traffic = onion_traffic;
 +      cfg->entry_cfg.cache_ipv4_answers = cache_ipv4;
 +      cfg->entry_cfg.cache_ipv6_answers = cache_ipv6;
 +      cfg->entry_cfg.use_cached_ipv4_answers = use_cached_ipv4;
 +      cfg->entry_cfg.use_cached_ipv6_answers = use_cached_ipv6;
 +      cfg->entry_cfg.prefer_ipv6_virtaddr = prefer_ipv6_automap;
 +      cfg->entry_cfg.socks_prefer_no_auth = prefer_no_auth;
 +      if (! (isolation & ISO_SOCKSAUTH))
 +        cfg->entry_cfg.socks_prefer_no_auth = 1;
 +      cfg->entry_cfg.socks_iso_keep_alive = socks_iso_keep_alive;
 +
 +      smartlist_add(out, cfg);
 +    }
 +    SMARTLIST_FOREACH(elts, char *, cp, tor_free(cp));
 +    smartlist_clear(elts);
 +    tor_free(addrport);
 +    tor_free(unix_socket_path);
 +  }
 +
 +  if (warn_nonlocal && out) {
 +    if (is_control)
 +      warn_nonlocal_controller_ports(out, forbid_nonlocal);
 +    else if (is_ext_orport)
 +      warn_nonlocal_ext_orports(out, portname);
 +    else
 +      warn_nonlocal_client_ports(out, portname, listener_type);
 +  }
 +
 +  if (got_zero_port && got_nonzero_port) {
 +    log_warn(LD_CONFIG, "You specified a nonzero %sPort along with '%sPort 0' "
 +             "in the same configuration. Did you mean to disable %sPort or "
 +             "not?", portname, portname, portname);
 +    goto err;
 +  }
 +
 +  retval = 0;
 + err:
 +  SMARTLIST_FOREACH(elts, char *, cp, tor_free(cp));
 +  smartlist_free(elts);
 +  tor_free(unix_socket_path);
 +  tor_free(addrport);
 +  return retval;
 +}
 +
 +/** Return the number of ports which are actually going to listen with type
 + * <b>listenertype</b>.  Do not count no_listen ports.  Only count unix
 + * sockets if count_sockets is true. */
 +static int
 +count_real_listeners(const smartlist_t *ports, int listenertype,
 +                     int count_sockets)
 +{
 +  int n = 0;
 +  SMARTLIST_FOREACH_BEGIN(ports, port_cfg_t *, port) {
 +    if (port->server_cfg.no_listen)
 +      continue;
 +    if (!count_sockets && port->is_unix_addr)
 +      continue;
 +    if (port->type != listenertype)
 +      continue;
 +    ++n;
 +  } SMARTLIST_FOREACH_END(port);
 +  return n;
 +}
 +
 +/** Parse all ports from <b>options</b>. On success, set *<b>n_ports_out</b>
 + * to the number of ports that are listed, update the *Port_set values in
 + * <b>options</b>, and return 0.  On failure, set *<b>msg</b> to a
 + * description of the problem and return -1.
 + *
 + * If <b>validate_only</b> is false, set configured_client_ports to the
 + * new list of ports parsed from <b>options</b>.
 + **/
 +static int
 +parse_ports(or_options_t *options, int validate_only,
 +            char **msg, int *n_ports_out,
 +            int *world_writable_control_socket)
 +{
 +  smartlist_t *ports;
 +  int retval = -1;
 +
 +  ports = smartlist_new();
 +
 +  *n_ports_out = 0;
 +
 +  const unsigned gw_flag = options->UnixSocksGroupWritable ?
 +    CL_PORT_DFLT_GROUP_WRITABLE : 0;
 +  if (parse_port_config(ports,
 +             options->SocksPort_lines,
 +             "Socks", CONN_TYPE_AP_LISTENER,
 +             "127.0.0.1", 9050,
 +             ((validate_only ? 0 : CL_PORT_WARN_NONLOCAL)
 +              | CL_PORT_TAKES_HOSTNAMES | gw_flag)) < 0) {
 +    *msg = tor_strdup("Invalid SocksPort configuration");
 +    goto err;
 +  }
 +  if (parse_port_config(ports,
 +                        options->DNSPort_lines,
 +                        "DNS", CONN_TYPE_AP_DNS_LISTENER,
 +                        "127.0.0.1", 0,
 +                        CL_PORT_WARN_NONLOCAL|CL_PORT_TAKES_HOSTNAMES) < 0) {
 +    *msg = tor_strdup("Invalid DNSPort configuration");
 +    goto err;
 +  }
 +  if (parse_port_config(ports,
 +                        options->TransPort_lines,
 +                        "Trans", CONN_TYPE_AP_TRANS_LISTENER,
 +                        "127.0.0.1", 0,
 +                        CL_PORT_WARN_NONLOCAL) < 0) {
 +    *msg = tor_strdup("Invalid TransPort configuration");
 +    goto err;
 +  }
 +  if (parse_port_config(ports,
 +                        options->NATDPort_lines,
 +                        "NATD", CONN_TYPE_AP_NATD_LISTENER,
 +                        "127.0.0.1", 0,
 +                        CL_PORT_WARN_NONLOCAL) < 0) {
 +    *msg = tor_strdup("Invalid NatdPort configuration");
 +    goto err;
 +  }
 +  if (parse_port_config(ports,
 +                        options->HTTPTunnelPort_lines,
 +                        "HTTP Tunnel", CONN_TYPE_AP_HTTP_CONNECT_LISTENER,
 +                        "127.0.0.1", 0,
 +                        ((validate_only ? 0 : CL_PORT_WARN_NONLOCAL)
 +                         | CL_PORT_TAKES_HOSTNAMES | gw_flag)) < 0) {
 +    *msg = tor_strdup("Invalid HTTPTunnelPort configuration");
 +    goto err;
 +  }
 +  {
 +    unsigned control_port_flags = CL_PORT_NO_STREAM_OPTIONS |
 +      CL_PORT_WARN_NONLOCAL;
 +    const int any_passwords = (options->HashedControlPassword ||
 +                               options->HashedControlSessionPassword ||
 +                               options->CookieAuthentication);
 +    if (! any_passwords)
 +      control_port_flags |= CL_PORT_FORBID_NONLOCAL;
 +    if (options->ControlSocketsGroupWritable)
 +      control_port_flags |= CL_PORT_DFLT_GROUP_WRITABLE;
 +
 +    if (parse_port_config(ports,
 +                          options->ControlPort_lines,
 +                          "Control", CONN_TYPE_CONTROL_LISTENER,
 +                          "127.0.0.1", 0,
 +                          control_port_flags) < 0) {
 +      *msg = tor_strdup("Invalid ControlPort configuration");
 +      goto err;
 +    }
 +
 +    if (parse_port_config(ports, options->ControlSocket,
 +                          "ControlSocket",
 +                          CONN_TYPE_CONTROL_LISTENER, NULL, 0,
 +                          control_port_flags | CL_PORT_IS_UNIXSOCKET) < 0) {
 +      *msg = tor_strdup("Invalid ControlSocket configuration");
 +      goto err;
 +    }
 +  }
 +  if (! options->ClientOnly) {
 +    if (parse_port_config(ports,
 +                          options->ORPort_lines,
 +                          "OR", CONN_TYPE_OR_LISTENER,
 +                          "0.0.0.0", 0,
 +                          CL_PORT_SERVER_OPTIONS) < 0) {
 +      *msg = tor_strdup("Invalid ORPort configuration");
 +      goto err;
 +    }
 +    if (parse_port_config(ports,
 +                          options->ExtORPort_lines,
 +                          "ExtOR", CONN_TYPE_EXT_OR_LISTENER,
 +                          "127.0.0.1", 0,
 +                          CL_PORT_SERVER_OPTIONS|CL_PORT_WARN_NONLOCAL) < 0) {
 +      *msg = tor_strdup("Invalid ExtORPort configuration");
 +      goto err;
 +    }
 +    if (parse_port_config(ports,
 +                          options->DirPort_lines,
 +                          "Dir", CONN_TYPE_DIR_LISTENER,
 +                          "0.0.0.0", 0,
 +                          CL_PORT_SERVER_OPTIONS) < 0) {
 +      *msg = tor_strdup("Invalid DirPort configuration");
 +      goto err;
 +    }
 +  }
 +
 +  int n_low_ports = 0;
 +  if (check_server_ports(ports, options, &n_low_ports) < 0) {
 +    *msg = tor_strdup("Misconfigured server ports");
 +    goto err;
 +  }
 +  if (have_low_ports < 0)
 +    have_low_ports = (n_low_ports > 0);
 +
 +  *n_ports_out = smartlist_len(ports);
 +
 +  retval = 0;
 +
 +  /* Update the *Port_set options.  The !! here is to force a boolean out of
 +     an integer. */
 +  options->ORPort_set =
 +    !! count_real_listeners(ports, CONN_TYPE_OR_LISTENER, 0);
 +  options->SocksPort_set =
 +    !! count_real_listeners(ports, CONN_TYPE_AP_LISTENER, 1);
 +  options->TransPort_set =
 +    !! count_real_listeners(ports, CONN_TYPE_AP_TRANS_LISTENER, 1);
 +  options->NATDPort_set =
 +    !! count_real_listeners(ports, CONN_TYPE_AP_NATD_LISTENER, 1);
 +  options->HTTPTunnelPort_set =
 +    !! count_real_listeners(ports, CONN_TYPE_AP_HTTP_CONNECT_LISTENER, 1);
 +  /* Use options->ControlSocket to test if a control socket is set */
 +  options->ControlPort_set =
 +    !! count_real_listeners(ports, CONN_TYPE_CONTROL_LISTENER, 0);
 +  options->DirPort_set =
 +    !! count_real_listeners(ports, CONN_TYPE_DIR_LISTENER, 0);
 +  options->DNSPort_set =
 +    !! count_real_listeners(ports, CONN_TYPE_AP_DNS_LISTENER, 1);
 +  options->ExtORPort_set =
 +    !! count_real_listeners(ports, CONN_TYPE_EXT_OR_LISTENER, 0);
 +
 +  if (world_writable_control_socket) {
 +    SMARTLIST_FOREACH(ports, port_cfg_t *, p,
 +      if (p->type == CONN_TYPE_CONTROL_LISTENER &&
 +          p->is_unix_addr &&
 +          p->is_world_writable) {
 +        *world_writable_control_socket = 1;
 +        break;
 +      });
 +  }
 +
 +  if (!validate_only) {
 +    if (configured_ports) {
 +      SMARTLIST_FOREACH(configured_ports,
 +                        port_cfg_t *, p, port_cfg_free(p));
 +      smartlist_free(configured_ports);
 +    }
 +    configured_ports = ports;
 +    ports = NULL; /* prevent free below. */
 +  }
 +
 + err:
 +  if (ports) {
 +    SMARTLIST_FOREACH(ports, port_cfg_t *, p, port_cfg_free(p));
 +    smartlist_free(ports);
 +  }
 +  return retval;
 +}
 +
 +/* Does port bind to IPv4? */
 +static int
 +port_binds_ipv4(const port_cfg_t *port)
 +{
 +  return tor_addr_family(&port->addr) == AF_INET ||
 +         (tor_addr_family(&port->addr) == AF_UNSPEC
 +          && !port->server_cfg.bind_ipv6_only);
 +}
 +
 +/* Does port bind to IPv6? */
 +static int
 +port_binds_ipv6(const port_cfg_t *port)
 +{
 +  return tor_addr_family(&port->addr) == AF_INET6 ||
 +         (tor_addr_family(&port->addr) == AF_UNSPEC
 +          && !port->server_cfg.bind_ipv4_only);
 +}
 +
 +/** Given a list of <b>port_cfg_t</b> in <b>ports</b>, check them for internal
 + * consistency and warn as appropriate.  Set *<b>n_low_ports_out</b> to the
 + * number of sub-1024 ports we will be binding. */
 +static int
 +check_server_ports(const smartlist_t *ports,
 +                   const or_options_t *options,
 +                   int *n_low_ports_out)
 +{
 +  int n_orport_advertised = 0;
 +  int n_orport_advertised_ipv4 = 0;
 +  int n_orport_listeners = 0;
 +  int n_dirport_advertised = 0;
 +  int n_dirport_listeners = 0;
 +  int n_low_port = 0;
 +  int r = 0;
 +
 +  SMARTLIST_FOREACH_BEGIN(ports, const port_cfg_t *, port) {
 +    if (port->type == CONN_TYPE_DIR_LISTENER) {
 +      if (! port->server_cfg.no_advertise)
 +        ++n_dirport_advertised;
 +      if (! port->server_cfg.no_listen)
 +        ++n_dirport_listeners;
 +    } else if (port->type == CONN_TYPE_OR_LISTENER) {
 +      if (! port->server_cfg.no_advertise) {
 +        ++n_orport_advertised;
 +        if (port_binds_ipv4(port))
 +          ++n_orport_advertised_ipv4;
 +      }
 +      if (! port->server_cfg.no_listen)
 +        ++n_orport_listeners;
 +    } else {
 +      continue;
 +    }
 +#ifndef _WIN32
 +    if (!port->server_cfg.no_listen && port->port < 1024)
 +      ++n_low_port;
 +#endif
 +  } SMARTLIST_FOREACH_END(port);
 +
 +  if (n_orport_advertised && !n_orport_listeners) {
 +    log_warn(LD_CONFIG, "We are advertising an ORPort, but not actually "
 +             "listening on one.");
 +    r = -1;
 +  }
 +  if (n_orport_listeners && !n_orport_advertised) {
 +    log_warn(LD_CONFIG, "We are listening on an ORPort, but not advertising "
 +             "any ORPorts. This will keep us from building a %s "
 +             "descriptor, and make us impossible to use.",
 +             options->BridgeRelay ? "bridge" : "router");
 +    r = -1;
 +  }
 +  if (n_dirport_advertised && !n_dirport_listeners) {
 +    log_warn(LD_CONFIG, "We are advertising a DirPort, but not actually "
 +             "listening on one.");
 +    r = -1;
 +  }
 +  if (n_dirport_advertised > 1) {
 +    log_warn(LD_CONFIG, "Can't advertise more than one DirPort.");
 +    r = -1;
 +  }
 +  if (n_orport_advertised && !n_orport_advertised_ipv4 &&
 +      !options->BridgeRelay) {
 +    log_warn(LD_CONFIG, "Configured public relay to listen only on an IPv6 "
 +             "address. Tor needs to listen on an IPv4 address too.");
 +    r = -1;
 +  }
 +
 +  if (n_low_port && options->AccountingMax &&
 +      (!have_capability_support() || options->KeepBindCapabilities == 0)) {
 +    const char *extra = "";
 +    if (options->KeepBindCapabilities == 0 && have_capability_support())
 +      extra = ", and you have disabled KeepBindCapabilities.";
 +    log_warn(LD_CONFIG,
 +          "You have set AccountingMax to use hibernation. You have also "
 +          "chosen a low DirPort or OrPort%s."
 +          "This combination can make Tor stop "
 +          "working when it tries to re-attach the port after a period of "
 +          "hibernation. Please choose a different port or turn off "
 +          "hibernation unless you know this combination will work on your "
 +          "platform.", extra);
 +  }
 +
 +  if (n_low_ports_out)
 +    *n_low_ports_out = n_low_port;
 +
 +  return r;
 +}
 +
 +/** Return a list of port_cfg_t for client ports parsed from the
 + * options. */
 +MOCK_IMPL(const smartlist_t *,
 +get_configured_ports,(void))
 +{
 +  if (!configured_ports)
 +    configured_ports = smartlist_new();
 +  return configured_ports;
 +}
 +
 +/** Return an address:port string representation of the address
 + *  where the first <b>listener_type</b> listener waits for
 + *  connections. Return NULL if we couldn't find a listener. The
 + *  string is allocated on the heap and it's the responsibility of the
 + *  caller to free it after use.
 + *
 + *  This function is meant to be used by the pluggable transport proxy
 + *  spawning code, please make sure that it fits your purposes before
 + *  using it. */
 +char *
 +get_first_listener_addrport_string(int listener_type)
 +{
 +  static const char *ipv4_localhost = "127.0.0.1";
 +  static const char *ipv6_localhost = "[::1]";
 +  const char *address;
 +  uint16_t port;
 +  char *string = NULL;
 +
 +  if (!configured_ports)
 +    return NULL;
 +
 +  SMARTLIST_FOREACH_BEGIN(configured_ports, const port_cfg_t *, cfg) {
 +    if (cfg->server_cfg.no_listen)
 +      continue;
 +
 +    if (cfg->type == listener_type &&
 +        tor_addr_family(&cfg->addr) != AF_UNSPEC) {
 +
 +      /* We found the first listener of the type we are interested in! */
 +
 +      /* If a listener is listening on INADDR_ANY, assume that it's
 +         also listening on 127.0.0.1, and point the transport proxy
 +         there: */
 +      if (tor_addr_is_null(&cfg->addr))
 +        address = tor_addr_is_v4(&cfg->addr) ? ipv4_localhost : ipv6_localhost;
 +      else
 +        address = fmt_and_decorate_addr(&cfg->addr);
 +
 +      /* If a listener is configured with port 'auto', we are forced
 +         to iterate all listener connections and find out in which
 +         port it ended up listening: */
 +      if (cfg->port == CFG_AUTO_PORT) {
 +        port = router_get_active_listener_port_by_type_af(listener_type,
 +                                                  tor_addr_family(&cfg->addr));
 +        if (!port)
 +          return NULL;
 +      } else {
 +        port = cfg->port;
 +      }
 +
 +      tor_asprintf(&string, "%s:%u", address, port);
 +
 +      return string;
 +    }
 +
 +  } SMARTLIST_FOREACH_END(cfg);
 +
 +  return NULL;
 +}
 +
 +/** Return the first advertised port of type <b>listener_type</b> in
 + * <b>address_family</b>. Returns 0 when no port is found, and when passed
 + * AF_UNSPEC. */
 +int
 +get_first_advertised_port_by_type_af(int listener_type, int address_family)
 +{
 +  if (address_family == AF_UNSPEC)
 +    return 0;
 +
 +  const smartlist_t *conf_ports = get_configured_ports();
 +  SMARTLIST_FOREACH_BEGIN(conf_ports, const port_cfg_t *, cfg) {
 +    if (cfg->type == listener_type &&
 +        !cfg->server_cfg.no_advertise) {
 +      if ((address_family == AF_INET && port_binds_ipv4(cfg)) ||
 +          (address_family == AF_INET6 && port_binds_ipv6(cfg))) {
 +        return cfg->port;
 +      }
 +    }
 +  } SMARTLIST_FOREACH_END(cfg);
 +  return 0;
 +}
 +
 +/** Return the first advertised address of type <b>listener_type</b> in
 + * <b>address_family</b>. Returns NULL if there is no advertised address,
 + * and when passed AF_UNSPEC. */
 +const tor_addr_t *
 +get_first_advertised_addr_by_type_af(int listener_type, int address_family)
 +{
 +  if (address_family == AF_UNSPEC)
 +    return NULL;
 +  if (!configured_ports)
 +    return NULL;
 +  SMARTLIST_FOREACH_BEGIN(configured_ports, const port_cfg_t *, cfg) {
 +    if (cfg->type == listener_type &&
 +        !cfg->server_cfg.no_advertise) {
 +      if ((address_family == AF_INET && port_binds_ipv4(cfg)) ||
 +          (address_family == AF_INET6 && port_binds_ipv6(cfg))) {
 +        return &cfg->addr;
 +      }
 +    }
 +  } SMARTLIST_FOREACH_END(cfg);
 +  return NULL;
 +}
 +
 +/** Return 1 if a port exists of type <b>listener_type</b> on <b>addr</b> and
 + * <b>port</b>. If <b>check_wildcard</b> is true, INADDR[6]_ANY and AF_UNSPEC
 + * addresses match any address of the appropriate family; and port -1 matches
 + * any port.
 + * To match auto ports, pass CFG_PORT_AUTO. (Does not match on the actual
 + * automatically chosen listener ports.) */
 +int
 +port_exists_by_type_addr_port(int listener_type, const tor_addr_t *addr,
 +                              int port, int check_wildcard)
 +{
 +  if (!configured_ports || !addr)
 +    return 0;
 +  SMARTLIST_FOREACH_BEGIN(configured_ports, const port_cfg_t *, cfg) {
 +    if (cfg->type == listener_type) {
 +      if (cfg->port == port || (check_wildcard && port == -1)) {
 +        /* Exact match */
 +        if (tor_addr_eq(&cfg->addr, addr)) {
 +          return 1;
 +        }
 +        /* Skip wildcard matches if we're not doing them */
 +        if (!check_wildcard) {
 +          continue;
 +        }
 +        /* Wildcard matches IPv4 */
 +        const int cfg_v4 = port_binds_ipv4(cfg);
 +        const int cfg_any_v4 = tor_addr_is_null(&cfg->addr) && cfg_v4;
 +        const int addr_v4 = tor_addr_family(addr) == AF_INET ||
 +                            tor_addr_family(addr) == AF_UNSPEC;
 +        const int addr_any_v4 = tor_addr_is_null(&cfg->addr) && addr_v4;
 +        if ((cfg_any_v4 && addr_v4) || (cfg_v4 && addr_any_v4)) {
 +          return 1;
 +        }
 +        /* Wildcard matches IPv6 */
 +        const int cfg_v6 = port_binds_ipv6(cfg);
 +        const int cfg_any_v6 = tor_addr_is_null(&cfg->addr) && cfg_v6;
 +        const int addr_v6 = tor_addr_family(addr) == AF_INET6 ||
 +                            tor_addr_family(addr) == AF_UNSPEC;
 +        const int addr_any_v6 = tor_addr_is_null(&cfg->addr) && addr_v6;
 +        if ((cfg_any_v6 && addr_v6) || (cfg_v6 && addr_any_v6)) {
 +          return 1;
 +        }
 +      }
 +    }
 +  } SMARTLIST_FOREACH_END(cfg);
 +  return 0;
 +}
 +
 +/* Like port_exists_by_type_addr_port, but accepts a host-order IPv4 address
 + * instead. */
 +int
 +port_exists_by_type_addr32h_port(int listener_type, uint32_t addr_ipv4h,
 +                                 int port, int check_wildcard)
 +{
 +  tor_addr_t ipv4;
 +  tor_addr_from_ipv4h(&ipv4, addr_ipv4h);
 +  return port_exists_by_type_addr_port(listener_type, &ipv4, port,
 +                                       check_wildcard);
 +}
 +
 +/** Allocate and return a good value for the DataDirectory based on
 + *  <b>val</b>, which may be NULL.  Return NULL on failure. */
 +static char *
 +get_data_directory(const char *val)
 +{
 +#ifdef _WIN32
 +  if (val) {
 +    return tor_strdup(val);
 +  } else {
 +    return tor_strdup(get_windows_conf_root());
 +  }
 +#else /* !(defined(_WIN32)) */
 +  const char *d = val;
 +  if (!d)
 +    d = "~/.tor";
 +
 +  if (!strcmpstart(d, "~/")) {
 +    char *fn = expand_filename(d);
 +    if (!fn) {
 +      log_warn(LD_CONFIG,"Failed to expand filename \"%s\".", d);
 +      return NULL;
 +    }
 +    if (!val && !strcmp(fn,"/.tor")) {
 +      /* If our homedir is /, we probably don't want to use it. */
 +      /* Default to LOCALSTATEDIR/tor which is probably closer to what we
 +       * want. */
 +      log_warn(LD_CONFIG,
 +               "Default DataDirectory is \"~/.tor\".  This expands to "
 +               "\"%s\", which is probably not what you want.  Using "
 +               "\"%s"PATH_SEPARATOR"tor\" instead", fn, LOCALSTATEDIR);
 +      tor_free(fn);
 +      fn = tor_strdup(LOCALSTATEDIR PATH_SEPARATOR "tor");
 +    }
 +    return fn;
 +  }
 +  return tor_strdup(d);
 +#endif /* defined(_WIN32) */
 +}
 +
 +/** Check and normalize the values of options->{Key,Data,Cache}Directory;
 + * return 0 if it is sane, -1 otherwise. */
 +static int
 +validate_data_directories(or_options_t *options)
 +{
 +  tor_free(options->DataDirectory);
 +  options->DataDirectory = get_data_directory(options->DataDirectory_option);
 +  if (!options->DataDirectory)
 +    return -1;
 +  if (strlen(options->DataDirectory) > (512-128)) {
 +    log_warn(LD_CONFIG, "DataDirectory is too long.");
 +    return -1;
 +  }
 +
 +  tor_free(options->KeyDirectory);
 +  if (options->KeyDirectory_option) {
 +    options->KeyDirectory = get_data_directory(options->KeyDirectory_option);
 +    if (!options->KeyDirectory)
 +      return -1;
 +  } else {
 +    /* Default to the data directory's keys subdir */
 +    tor_asprintf(&options->KeyDirectory, "%s"PATH_SEPARATOR"keys",
 +                 options->DataDirectory);
 +  }
 +
 +  tor_free(options->CacheDirectory);
 +  if (options->CacheDirectory_option) {
 +    options->CacheDirectory = get_data_directory(
 +                                             options->CacheDirectory_option);
 +    if (!options->CacheDirectory)
 +      return -1;
 +  } else {
 +    /* Default to the data directory. */
 +    options->CacheDirectory = tor_strdup(options->DataDirectory);
 +  }
 +
 +  return 0;
 +}
 +
 +/** This string must remain the same forevermore. It is how we
 + * recognize that the torrc file doesn't need to be backed up. */
 +#define GENERATED_FILE_PREFIX "# This file was generated by Tor; " \
 +  "if you edit it, comments will not be preserved"
 +/** This string can change; it tries to give the reader an idea
 + * that editing this file by hand is not a good plan. */
 +#define GENERATED_FILE_COMMENT "# The old torrc file was renamed " \
 +  "to torrc.orig.1 or similar, and Tor will ignore it"
 +
 +/** Save a configuration file for the configuration in <b>options</b>
 + * into the file <b>fname</b>.  If the file already exists, and
 + * doesn't begin with GENERATED_FILE_PREFIX, rename it.  Otherwise
 + * replace it.  Return 0 on success, -1 on failure. */
 +static int
 +write_configuration_file(const char *fname, const or_options_t *options)
 +{
 +  char *old_val=NULL, *new_val=NULL, *new_conf=NULL;
 +  int rename_old = 0, r;
 +
 +  if (!fname)
 +    return -1;
 +
 +  switch (file_status(fname)) {
 +    /* create backups of old config files, even if they're empty */
 +    case FN_FILE:
 +    case FN_EMPTY:
 +      old_val = read_file_to_str(fname, 0, NULL);
 +      if (!old_val || strcmpstart(old_val, GENERATED_FILE_PREFIX)) {
 +        rename_old = 1;
 +      }
 +      tor_free(old_val);
 +      break;
 +    case FN_NOENT:
 +      break;
 +    case FN_ERROR:
 +    case FN_DIR:
 +    default:
 +      log_warn(LD_CONFIG,
 +               "Config file \"%s\" is not a file? Failing.", fname);
 +      return -1;
 +  }
 +
 +  if (!(new_conf = options_dump(options, OPTIONS_DUMP_MINIMAL))) {
 +    log_warn(LD_BUG, "Couldn't get configuration string");
 +    goto err;
 +  }
 +
 +  tor_asprintf(&new_val, "%s\n%s\n\n%s",
 +               GENERATED_FILE_PREFIX, GENERATED_FILE_COMMENT, new_conf);
 +
 +  if (rename_old) {
 +    int i = 1;
 +    char *fn_tmp = NULL;
 +    while (1) {
 +      tor_asprintf(&fn_tmp, "%s.orig.%d", fname, i);
 +      if (file_status(fn_tmp) == FN_NOENT)
 +        break;
 +      tor_free(fn_tmp);
 +      ++i;
 +    }
 +    log_notice(LD_CONFIG, "Renaming old configuration file to \"%s\"", fn_tmp);
 +    if (tor_rename(fname, fn_tmp) < 0) {//XXXX sandbox doesn't allow
 +      log_warn(LD_FS,
 +               "Couldn't rename configuration file \"%s\" to \"%s\": %s",
 +               fname, fn_tmp, strerror(errno));
 +      tor_free(fn_tmp);
 +      goto err;
 +    }
 +    tor_free(fn_tmp);
 +  }
 +
 +  if (write_str_to_file(fname, new_val, 0) < 0)
 +    goto err;
 +
 +  r = 0;
 +  goto done;
 + err:
 +  r = -1;
 + done:
 +  tor_free(new_val);
 +  tor_free(new_conf);
 +  return r;
 +}
 +
 +/**
 + * Save the current configuration file value to disk.  Return 0 on
 + * success, -1 on failure.
 + **/
 +int
 +options_save_current(void)
 +{
 +  /* This fails if we can't write to our configuration file.
 +   *
 +   * If we try falling back to datadirectory or something, we have a better
 +   * chance of saving the configuration, but a better chance of doing
 +   * something the user never expected. */
 +  return write_configuration_file(get_torrc_fname(0), get_options());
 +}
 +
 +/** Return the number of cpus configured in <b>options</b>.  If we are
 + * told to auto-detect the number of cpus, return the auto-detected number. */
 +int
 +get_num_cpus(const or_options_t *options)
 +{
 +  if (options->NumCPUs == 0) {
 +    int n = compute_num_cpus();
 +    return (n >= 1) ? n : 1;
 +  } else {
 +    return options->NumCPUs;
 +  }
 +}
 +
 +/**
 + * Initialize the libevent library.
 + */
 +static void
 +init_libevent(const or_options_t *options)
 +{
 +  tor_libevent_cfg cfg;
 +
 +  tor_assert(options);
 +
 +  configure_libevent_logging();
 +  /* If the kernel complains that some method (say, epoll) doesn't
 +   * exist, we don't care about it, since libevent will cope.
 +   */
 +  suppress_libevent_log_msg("Function not implemented");
 +
 +  memset(&cfg, 0, sizeof(cfg));
 +  cfg.num_cpus = get_num_cpus(options);
 +  cfg.msec_per_tick = options->TokenBucketRefillInterval;
 +
 +  tor_libevent_initialize(&cfg);
 +
 +  suppress_libevent_log_msg(NULL);
 +}
 +
 +/** Return a newly allocated string holding a filename relative to the
 + * directory in <b>options</b> specified by <b>roottype</b>.
 + * If <b>sub1</b> is present, it is the first path component after
 + * the data directory.  If <b>sub2</b> is also present, it is the second path
 + * component after the data directory.  If <b>suffix</b> is present, it
 + * is appended to the filename.
 + *
 + * Note: Consider using macros in config.h that wrap this function;
 + * you should probably never need to call it as-is.
 + */
 +MOCK_IMPL(char *,
 +options_get_dir_fname2_suffix,(const or_options_t *options,
 +                               directory_root_t roottype,
 +                               const char *sub1, const char *sub2,
 +                               const char *suffix))
 +{
 +  tor_assert(options);
 +
 +  const char *rootdir = NULL;
 +  switch (roottype) {
 +    case DIRROOT_DATADIR:
 +      rootdir = options->DataDirectory;
 +      break;
 +    case DIRROOT_CACHEDIR:
 +      rootdir = options->CacheDirectory;
 +      break;
 +    case DIRROOT_KEYDIR:
 +      rootdir = options->KeyDirectory;
 +      break;
 +    default:
 +      tor_assert_unreached();
 +      break;
 +  }
 +  tor_assert(rootdir);
 +
 +  if (!suffix)
 +    suffix = "";
 +
 +  char *fname = NULL;
 +
 +  if (sub1 == NULL) {
 +    tor_asprintf(&fname, "%s%s", rootdir, suffix);
 +    tor_assert(!sub2); /* If sub2 is present, sub1 must be present. */
 +  } else if (sub2 == NULL) {
 +    tor_asprintf(&fname, "%s"PATH_SEPARATOR"%s%s", rootdir, sub1, suffix);
 +  } else {
 +    tor_asprintf(&fname, "%s"PATH_SEPARATOR"%s"PATH_SEPARATOR"%s%s",
 +                 rootdir, sub1, sub2, suffix);
 +  }
 +
 +  return fname;
 +}
 +
 +/** Check wether the data directory has a private subdirectory
 + * <b>subdir</b>. If not, try to create it. Return 0 on success,
 + * -1 otherwise. */
 +int
 +check_or_create_data_subdir(const char *subdir)
 +{
 +  char *statsdir = get_datadir_fname(subdir);
 +  int return_val = 0;
 +
 +  if (check_private_dir(statsdir, CPD_CREATE, get_options()->User) < 0) {
 +    log_warn(LD_HIST, "Unable to create %s/ directory!", subdir);
 +    return_val = -1;
 +  }
 +  tor_free(statsdir);
 +  return return_val;
 +}
 +
 +/** Create a file named <b>fname</b> with contents <b>str</b> in the
 + * subdirectory <b>subdir</b> of the data directory. <b>descr</b>
 + * should be a short description of the file's content and will be
 + * used for the warning message, if it's present and the write process
 + * fails. Return 0 on success, -1 otherwise.*/
 +int
 +write_to_data_subdir(const char* subdir, const char* fname,
 +                     const char* str, const char* descr)
 +{
 +  char *filename = get_datadir_fname2(subdir, fname);
 +  int return_val = 0;
 +
 +  if (write_str_to_file(filename, str, 0) < 0) {
 +    log_warn(LD_HIST, "Unable to write %s to disk!", descr ? descr : fname);
 +    return_val = -1;
 +  }
 +  tor_free(filename);
 +  return return_val;
 +}
 +
 +/** Return a smartlist of ports that must be forwarded by
 + *  tor-fw-helper. The smartlist contains the ports in a string format
 + *  that is understandable by tor-fw-helper. */
 +smartlist_t *
 +get_list_of_ports_to_forward(void)
 +{
 +  smartlist_t *ports_to_forward = smartlist_new();
 +  int port = 0;
 +
 +  /** XXX TODO tor-fw-helper does not support forwarding ports to
 +      other hosts than the local one. If the user is binding to a
 +      different IP address, tor-fw-helper won't work.  */
 +  port = router_get_advertised_or_port(get_options());  /* Get ORPort */
 +  if (port)
 +    smartlist_add_asprintf(ports_to_forward, "%d:%d", port, port);
 +
 +  port = router_get_advertised_dir_port(get_options(), 0); /* Get DirPort */
 +  if (port)
 +    smartlist_add_asprintf(ports_to_forward, "%d:%d", port, port);
 +
 +  /* Get ports of transport proxies */
 +  {
 +    smartlist_t *transport_ports = get_transport_proxy_ports();
 +    if (transport_ports) {
 +      smartlist_add_all(ports_to_forward, transport_ports);
 +      smartlist_free(transport_ports);
 +    }
 +  }
 +
 +  if (!smartlist_len(ports_to_forward)) {
 +    smartlist_free(ports_to_forward);
 +    ports_to_forward = NULL;
 +  }
 +
 +  return ports_to_forward;
 +}
 +
 +/** Helper to implement GETINFO functions about configuration variables (not
 + * their values).  Given a "config/names" question, set *<b>answer</b> to a
 + * new string describing the supported configuration variables and their
 + * types. */
 +int
 +getinfo_helper_config(control_connection_t *conn,
 +                      const char *question, char **answer,
 +                      const char **errmsg)
 +{
 +  (void) conn;
 +  (void) errmsg;
 +  if (!strcmp(question, "config/names")) {
 +    smartlist_t *sl = smartlist_new();
 +    int i;
 +    for (i = 0; option_vars_[i].name; ++i) {
 +      const config_var_t *var = &option_vars_[i];
 +      const char *type;
 +      /* don't tell controller about triple-underscore options */
 +      if (!strncmp(option_vars_[i].name, "___", 3))
 +        continue;
 +      switch (var->type) {
 +        case CONFIG_TYPE_STRING: type = "String"; break;
 +        case CONFIG_TYPE_FILENAME: type = "Filename"; break;
 +        case CONFIG_TYPE_UINT: type = "Integer"; break;
 +        case CONFIG_TYPE_UINT64: type = "Integer"; break;
 +        case CONFIG_TYPE_INT: type = "SignedInteger"; break;
 +        case CONFIG_TYPE_PORT: type = "Port"; break;
 +        case CONFIG_TYPE_INTERVAL: type = "TimeInterval"; break;
 +        case CONFIG_TYPE_MSEC_INTERVAL: type = "TimeMsecInterval"; break;
 +        case CONFIG_TYPE_MEMUNIT: type = "DataSize"; break;
 +        case CONFIG_TYPE_DOUBLE: type = "Float"; break;
 +        case CONFIG_TYPE_BOOL: type = "Boolean"; break;
 +        case CONFIG_TYPE_AUTOBOOL: type = "Boolean+Auto"; break;
 +        case CONFIG_TYPE_ISOTIME: type = "Time"; break;
 +        case CONFIG_TYPE_ROUTERSET: type = "RouterList"; break;
 +        case CONFIG_TYPE_CSV: type = "CommaList"; break;
 +        /* This type accepts more inputs than TimeInterval, but it ignores
 +         * everything after the first entry, so we may as well pretend
 +         * it's a TimeInterval. */
 +        case CONFIG_TYPE_CSV_INTERVAL: type = "TimeInterval"; break;
 +        case CONFIG_TYPE_LINELIST: type = "LineList"; break;
 +        case CONFIG_TYPE_LINELIST_S: type = "Dependent"; break;
 +        case CONFIG_TYPE_LINELIST_V: type = "Virtual"; break;
 +        default:
 +        case CONFIG_TYPE_OBSOLETE:
 +          type = NULL; break;
 +      }
 +      if (!type)
 +        continue;
 +      smartlist_add_asprintf(sl, "%s %s\n",var->name,type);
 +    }
 +    *answer = smartlist_join_strings(sl, "", 0, NULL);
 +    SMARTLIST_FOREACH(sl, char *, c, tor_free(c));
 +    smartlist_free(sl);
 +  } else if (!strcmp(question, "config/defaults")) {
 +    smartlist_t *sl = smartlist_new();
 +    int dirauth_lines_seen = 0, fallback_lines_seen = 0;
 +    for (int i = 0; option_vars_[i].name; ++i) {
 +      const config_var_t *var = &option_vars_[i];
 +      if (var->initvalue != NULL) {
 +        if (strcmp(option_vars_[i].name, "DirAuthority") == 0) {
 +          /*
 +           * Count dirauth lines we have a default for; we'll use the
 +           * count later to decide whether to add the defaults manually
 +           */
 +          ++dirauth_lines_seen;
 +        }
 +        if (strcmp(option_vars_[i].name, "FallbackDir") == 0) {
 +          /*
 +           * Similarly count fallback lines, so that we can decided later
 +           * to add the defaults manually.
 +           */
 +          ++fallback_lines_seen;
 +        }
 +        char *val = esc_for_log(var->initvalue);
 +        smartlist_add_asprintf(sl, "%s %s\n",var->name,val);
 +        tor_free(val);
 +      }
 +    }
 +
 +    if (dirauth_lines_seen == 0) {
 +      /*
 +       * We didn't see any directory authorities with default values,
 +       * so add the list of default authorities manually.
 +       */
 +
 +      /*
 +       * default_authorities is defined earlier in this file and
 +       * is a const char ** NULL-terminated array of dirauth config
 +       * lines.
 +       */
 +      for (const char **i = default_authorities; *i != NULL; ++i) {
 +        char *val = esc_for_log(*i);
 +        smartlist_add_asprintf(sl, "DirAuthority %s\n", val);
 +        tor_free(val);
 +      }
 +    }
 +
 +    if (fallback_lines_seen == 0 &&
 +        get_options()->UseDefaultFallbackDirs == 1) {
 +      /*
 +       * We didn't see any explicitly configured fallback mirrors,
 +       * so add the defaults to the list manually.
 +       *
 +       * default_fallbacks is included earlier in this file and
 +       * is a const char ** NULL-terminated array of fallback config lines.
 +       */
 +      const char **i;
 +
 +      for (i = default_fallbacks; *i != NULL; ++i) {
 +        char *val = esc_for_log(*i);
 +        smartlist_add_asprintf(sl, "FallbackDir %s\n", val);
 +        tor_free(val);
 +      }
 +    }
 +
 +    *answer = smartlist_join_strings(sl, "", 0, NULL);
 +    SMARTLIST_FOREACH(sl, char *, c, tor_free(c));
 +    smartlist_free(sl);
 +  }
 +  return 0;
 +}
 +
 +/* Check whether an address has already been set against the options
 + * depending on address family and destination type. Any exsting
 + * value will lead to a fail, even if it is the same value. If not
 + * set and not only validating, copy it into this location too.
 + * Returns 0 on success or -1 if this address is already set.
 + */
 +static int
 +verify_and_store_outbound_address(sa_family_t family, tor_addr_t *addr,
 +       outbound_addr_t type, or_options_t *options, int validate_only)
 +{
 +  if (type>=OUTBOUND_ADDR_MAX || (family!=AF_INET && family!=AF_INET6)) {
 +    return -1;
 +  }
 +  int fam_index=0;
 +  if (family==AF_INET6) {
 +    fam_index=1;
 +  }
 +  tor_addr_t *dest=&options->OutboundBindAddresses[type][fam_index];
 +  if (!tor_addr_is_null(dest)) {
 +    return -1;
 +  }
 +  if (!validate_only) {
 +    tor_addr_copy(dest, addr);
 +  }
 +  return 0;
 +}
 +
 +/* Parse a list of address lines for a specific destination type.
 + * Will store them into the options if not validate_only. If a
 + * problem occurs, a suitable error message is store in msg.
 + * Returns 0 on success or -1 if any address is already set.
 + */
 +static int
 +parse_outbound_address_lines(const config_line_t *lines, outbound_addr_t type,
 +           or_options_t *options, int validate_only, char **msg)
 +{
 +  tor_addr_t addr;
 +  sa_family_t family;
 +  while (lines) {
 +    family = tor_addr_parse(&addr, lines->value);
 +    if (verify_and_store_outbound_address(family, &addr, type,
 +                                 options, validate_only)) {
 +      if (msg)
 +        tor_asprintf(msg, "Multiple%s%s outbound bind addresses "
 +                     "configured: %s",
 +                     family==AF_INET?" IPv4":(family==AF_INET6?" IPv6":""),
 +                     type==OUTBOUND_ADDR_OR?" OR":
 +                     (type==OUTBOUND_ADDR_EXIT?" exit":""), lines->value);
 +      return -1;
 +    }
 +    lines = lines->next;
 +  }
 +  return 0;
 +}
 +
 +/** Parse outbound bind address option lines. If <b>validate_only</b>
 + * is not 0 update OutboundBindAddresses in <b>options</b>.
 + * Only one address can be set for any of these values.
 + * On failure, set <b>msg</b> (if provided) to a newly allocated string
 + * containing a description of the problem and return -1.
 + */
 +static int
 +parse_outbound_addresses(or_options_t *options, int validate_only, char **msg)
 +{
 +  if (!validate_only) {
 +    memset(&options->OutboundBindAddresses, 0,
 +           sizeof(options->OutboundBindAddresses));
 +  }
 +
 +  if (parse_outbound_address_lines(options->OutboundBindAddress,
 +                                   OUTBOUND_ADDR_EXIT_AND_OR, options,
 +                                   validate_only, msg) < 0) {
 +    goto err;
 +  }
 +
 +  if (parse_outbound_address_lines(options->OutboundBindAddressOR,
 +                                   OUTBOUND_ADDR_OR, options, validate_only,
 +                                   msg) < 0) {
 +    goto err;
 +  }
 +
 +  if (parse_outbound_address_lines(options->OutboundBindAddressExit,
 +                                   OUTBOUND_ADDR_EXIT, options, validate_only,
 +                                   msg)  < 0) {
 +    goto err;
 +  }
 +
 +  return 0;
 + err:
 +  return -1;
 +}
 +
 +/** Load one of the geoip files, <a>family</a> determining which
 + * one. <a>default_fname</a> is used if on Windows and
 + * <a>fname</a> equals "<default>". */
 +static void
 +config_load_geoip_file_(sa_family_t family,
 +                        const char *fname,
 +                        const char *default_fname)
 +{
 +  const or_options_t *options = get_options();
 +  const char *msg = "";
 +  int severity = options_need_geoip_info(options, &msg) ? LOG_WARN : LOG_INFO;
 +  int r;
 +
 +#ifdef _WIN32
 +  char *free_fname = NULL; /* Used to hold any temporary-allocated value */
 +  /* XXXX Don't use this "<default>" junk; make our filename options
 +   * understand prefixes somehow. -NM */
 +  if (!strcmp(fname, "<default>")) {
 +    const char *conf_root = get_windows_conf_root();
 +    tor_asprintf(&free_fname, "%s\\%s", conf_root, default_fname);
 +    fname = free_fname;
 +  }
 +  r = geoip_load_file(family, fname, severity);
 +  tor_free(free_fname);
 +#else /* !(defined(_WIN32)) */
 +  (void)default_fname;
 +  r = geoip_load_file(family, fname, severity);
 +#endif /* defined(_WIN32) */
 +
 +  if (r < 0 && severity == LOG_WARN) {
 +    log_warn(LD_GENERAL, "%s", msg);
 +  }
 +}
 +
 +/** Load geoip files for IPv4 and IPv6 if <a>options</a> and
 + * <a>old_options</a> indicate we should. */
 +static void
 +config_maybe_load_geoip_files_(const or_options_t *options,
 +                               const or_options_t *old_options)
 +{
 +  /* XXXX Reload GeoIPFile on SIGHUP. -NM */
 +
 +  if (options->GeoIPFile &&
 +      ((!old_options || !opt_streq(old_options->GeoIPFile,
 +                                   options->GeoIPFile))
 +       || !geoip_is_loaded(AF_INET))) {
 +    config_load_geoip_file_(AF_INET, options->GeoIPFile, "geoip");
 +    /* Okay, now we need to maybe change our mind about what is in
 +     * which country. We do this for IPv4 only since that's what we
 +     * store in node->country. */
 +    refresh_all_country_info();
 +  }
 +  if (options->GeoIPv6File &&
 +      ((!old_options || !opt_streq(old_options->GeoIPv6File,
 +                                   options->GeoIPv6File))
 +       || !geoip_is_loaded(AF_INET6))) {
 +    config_load_geoip_file_(AF_INET6, options->GeoIPv6File, "geoip6");
 +  }
 +}
 +
 +/** Initialize cookie authentication (used so far by the ControlPort
 + *  and Extended ORPort).
 + *
 + *  Allocate memory and create a cookie (of length <b>cookie_len</b>)
 + *  in <b>cookie_out</b>.
 + *  Then write it down to <b>fname</b> and prepend it with <b>header</b>.
 + *
 + *  If <b>group_readable</b> is set, set <b>fname</b> to be readable
 + *  by the default GID.
 + *
 + *  If the whole procedure was successful, set
 + *  <b>cookie_is_set_out</b> to True. */
 +int
 +init_cookie_authentication(const char *fname, const char *header,
 +                           int cookie_len, int group_readable,
 +                           uint8_t **cookie_out, int *cookie_is_set_out)
 +{
 +  char cookie_file_str_len = strlen(header) + cookie_len;
 +  char *cookie_file_str = tor_malloc(cookie_file_str_len);
 +  int retval = -1;
 +
 +  /* We don't want to generate a new cookie every time we call
 +   * options_act(). One should be enough. */
 +  if (*cookie_is_set_out) {
 +    retval = 0; /* we are all set */
 +    goto done;
 +  }
 +
 +  /* If we've already set the cookie, free it before re-setting
 +     it. This can happen if we previously generated a cookie, but
 +     couldn't write it to a disk. */
 +  if (*cookie_out)
 +    tor_free(*cookie_out);
 +
 +  /* Generate the cookie */
 +  *cookie_out = tor_malloc(cookie_len);
 +  crypto_rand((char *)*cookie_out, cookie_len);
 +
 +  /* Create the string that should be written on the file. */
 +  memcpy(cookie_file_str, header, strlen(header));
 +  memcpy(cookie_file_str+strlen(header), *cookie_out, cookie_len);
 +  if (write_bytes_to_file(fname, cookie_file_str, cookie_file_str_len, 1)) {
 +    log_warn(LD_FS,"Error writing auth cookie to %s.", escaped(fname));
 +    goto done;
 +  }
 +
 +#ifndef _WIN32
 +  if (group_readable) {
 +    if (chmod(fname, 0640)) {
 +      log_warn(LD_FS,"Unable to make %s group-readable.", escaped(fname));
 +    }
 +  }
 +#else /* !(!defined(_WIN32)) */
 +  (void) group_readable;
 +#endif /* !defined(_WIN32) */
 +
 +  /* Success! */
 +  log_info(LD_GENERAL, "Generated auth cookie file in '%s'.", escaped(fname));
 +  *cookie_is_set_out = 1;
 +  retval = 0;
 +
 + done:
 +  memwipe(cookie_file_str, 0, cookie_file_str_len);
 +  tor_free(cookie_file_str);
 +  return retval;
 +}
 +
 +/**
 + * Return true if any option is set in <b>options</b> to make us behave
 + * as a client.
 + */
 +int
 +options_any_client_port_set(const or_options_t *options)
 +{
 +  return (options->SocksPort_set ||
 +          options->TransPort_set ||
 +          options->NATDPort_set ||
 +          options->DNSPort_set ||
 +          options->HTTPTunnelPort_set);
 +}



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