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[tor-commits] [tor/release-0.2.2] "(Socks|Control|etc)Port auto" now tells Tor to open an arbitrary port
commit 5fec8fe559b1a1f4bcb55c8f2c1f048f5abee3de
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date: Mon May 2 15:05:10 2011 -0400
"(Socks|Control|etc)Port auto" now tells Tor to open an arbitrary port
This is the major part of the implementation for trac issue 3076.
---
changes/feature3076 | 5 ++++
doc/tor.1.txt | 37 +++++++++++++++++++++-------------
src/or/config.c | 55 ++++++++++++++++++++++++--------------------------
src/or/connection.c | 45 +++++++++++++++++++++++++++++------------
src/or/or.h | 4 +++
5 files changed, 90 insertions(+), 56 deletions(-)
diff --git a/changes/feature3076 b/changes/feature3076
new file mode 100644
index 0000000..5822850
--- /dev/null
+++ b/changes/feature3076
@@ -0,0 +1,5 @@
+ o Minor features
+ - The options SocksPort, ControlPort, and so on now all accept an
+ optional value "auto" that opens a socket on an OS-selected port.
+
+
diff --git a/doc/tor.1.txt b/doc/tor.1.txt
index fb4b3f9..e48342e 100644
--- a/doc/tor.1.txt
+++ b/doc/tor.1.txt
@@ -145,13 +145,15 @@ Other options can be specified either on the command-line (--option
all sockets will be set to this limit. Must be a value between 2048 and
262144, in 1024 byte increments. Default of 8192 is recommended.
-**ControlPort** __Port__::
+**ControlPort** __PORT__|**auto**::
If set, Tor will accept connections on this port and allow those
connections to control the Tor process using the Tor Control Protocol
(described in control-spec.txt). Note: unless you also specify one of
- **HashedControlPassword** or **CookieAuthentication**, setting this option will
+ **HashedControlPassword** or **CookieAuthentication**, setting this
+ option will
cause Tor to allow any process on the local host to control it. This
option is required for many Tor controllers; most use the value of 9051.
+ Set it to "auto" to have Tor pick a port for you. (Default: 0).
**ControlListenAddress** __IP__[:__PORT__]::
Bind the controller listener to this address. If you specify a port, bind
@@ -647,10 +649,11 @@ The following options are useful only for clients (that is, if
the same circuit. Currently, two addresses are "too close" if they lie in
the same /16 range. (Default: 1)
-**SocksPort** __PORT__::
+**SocksPort** __PORT__|**auto**::
Advertise this port to listen for connections from Socks-speaking
applications. Set this to 0 if you don't want to allow application
- connections. (Default: 9050)
+ connections via SOCKS. Set it to "auto" to have Tor pick a port for
+ you. (Default: 9050)
**SocksListenAddress** __IP__[:__PORT__]::
Bind to this address to listen for connections from Socks-speaking
@@ -759,23 +762,25 @@ The following options are useful only for clients (that is, if
operating as a relay, and it will never use the public key step if it
doesn't yet know the onion key of the first hop. (Default: 1)
-**TransPort** __PORT__::
+**TransPort** __PORT__|**auto**::
If non-zero, enables transparent proxy support on __PORT__ (by convention,
9040). Requires OS support for transparent proxies, such as BSDs' pf or
Linux's IPTables. If you're planning to use Tor as a transparent proxy for
a network, you'll want to examine and change VirtualAddrNetwork from the
default setting. You'll also want to set the TransListenAddress option for
- the network you'd like to proxy. (Default: 0).
+ the network you'd like to proxy. Set it to "auto" to have Tor pick a
+ port for you. (Default: 0).
**TransListenAddress** __IP__[:__PORT__]::
Bind to this address to listen for transparent proxy connections. (Default:
127.0.0.1). This is useful for exporting a transparent proxy server to an
entire network.
-**NATDPort** __PORT__::
+**NATDPort** __PORT__|**auto**::
Allow old versions of ipfw (as included in old versions of FreeBSD, etc.)
to send connections through Tor using the NATD protocol. This option is
- only for people who cannot use TransPort.
+ only for people who cannot use TransPort. Set it to "auto" to have Tor
+ pick a port for you. (Default: 0)
**NATDListenAddress** __IP__[:__PORT__]::
Bind to this address to listen for NATD connections. (Default: 127.0.0.1).
@@ -791,9 +796,10 @@ The following options are useful only for clients (that is, if
A comma-separated list of suffixes to use with **AutomapHostsOnResolve**.
The "." suffix is equivalent to "all addresses." (Default: .exit,.onion).
-**DNSPort** __PORT__::
+**DNSPort** __PORT__|**auto**::
If non-zero, Tor listens for UDP DNS requests on this port and resolves
- them anonymously. (Default: 0).
+ them anonymously. Set it to "auto" to have Tor pick a port for
+ you. (Default: 0).
**DNSListenAddress** __IP__[:__PORT__]::
Bind to this address to listen for DNS connections. (Default: 127.0.0.1).
@@ -945,8 +951,10 @@ is non-zero):
**NumCPUs** __num__::
How many processes to use at once for decrypting onionskins. (Default: 1)
-**ORPort** __PORT__::
- Advertise this port to listen for connections from Tor clients and servers.
+**ORPort** __PORT__|**auto**::
+ Advertise this port to listen for connections from Tor clients and
+ servers. This option is required to be a Tor server.
+ Set it to "auto" to have Tor pick a port for you. (Default: 0).
**ORListenAddress** __IP__[:__PORT__]::
Bind to this IP address to listen for connections from Tor clients and
@@ -1158,8 +1166,9 @@ if DirPort is non-zero):
Minimum uptime of a v2 hidden service directory to be accepted as such by
authoritative directories. (Default: 24 hours)
-**DirPort** __PORT__::
- Advertise the directory service on this port.
+**DirPort** __PORT__|**auto**::
+ If this option is nonzero, advertise the directory service on this port.
+ Set it to "auto" to have Tor pick a port for you. (Default: 0)
**DirListenAddress** __IP__[:__PORT__]::
Bind the directory service to this address. If you specify a port, bind to
diff --git a/src/or/config.c b/src/or/config.c
index 9f94ef1..055a4b8 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -43,6 +43,8 @@ typedef enum config_type_t {
CONFIG_TYPE_STRING = 0, /**< An arbitrary string. */
CONFIG_TYPE_FILENAME, /**< A filename: some prefixes get expanded. */
CONFIG_TYPE_UINT, /**< A non-negative integer less than MAX_INT */
+ CONFIG_TYPE_PORT, /**< A port from 1...65535, 0 for "not set", or
+ * "auto". */
CONFIG_TYPE_INTERVAL, /**< A number of seconds, with optional units*/
CONFIG_TYPE_MEMUNIT, /**< A number of bytes, with optional units*/
CONFIG_TYPE_DOUBLE, /**< A floating-point value */
@@ -203,7 +205,7 @@ static config_var_t _option_vars[] = {
V(ConstrainedSockSize, MEMUNIT, "8192"),
V(ContactInfo, STRING, NULL),
V(ControlListenAddress, LINELIST, NULL),
- V(ControlPort, UINT, "0"),
+ V(ControlPort, PORT, "0"),
V(ControlSocket, LINELIST, NULL),
V(CookieAuthentication, BOOL, "0"),
V(CookieAuthFileGroupReadable, BOOL, "0"),
@@ -215,7 +217,7 @@ static config_var_t _option_vars[] = {
V(DirListenAddress, LINELIST, NULL),
OBSOLETE("DirFetchPeriod"),
V(DirPolicy, LINELIST, NULL),
- V(DirPort, UINT, "0"),
+ V(DirPort, PORT, "0"),
V(DirPortFrontPage, FILENAME, NULL),
OBSOLETE("DirPostPeriod"),
OBSOLETE("DirRecordUsageByCountry"),
@@ -225,7 +227,7 @@ static config_var_t _option_vars[] = {
V(DirReqStatistics, BOOL, "0"),
VAR("DirServer", LINELIST, DirServers, NULL),
V(DisableAllSwap, BOOL, "0"),
- V(DNSPort, UINT, "0"),
+ V(DNSPort, PORT, "0"),
V(DNSListenAddress, LINELIST, NULL),
V(DownloadExtraInfo, BOOL, "0"),
V(EnforceDistinctSubnets, BOOL, "1"),
@@ -304,7 +306,7 @@ static config_var_t _option_vars[] = {
V(NewCircuitPeriod, INTERVAL, "30 seconds"),
VAR("NamingAuthoritativeDirectory",BOOL, NamingAuthoritativeDir, "0"),
V(NATDListenAddress, LINELIST, NULL),
- V(NATDPort, UINT, "0"),
+ V(NATDPort, PORT, "0"),
V(Nickname, STRING, NULL),
V(WarnUnsafeSocks, BOOL, "1"),
OBSOLETE("NoPublish"),
@@ -312,7 +314,7 @@ static config_var_t _option_vars[] = {
V(NumCPUs, UINT, "1"),
V(NumEntryGuards, UINT, "3"),
V(ORListenAddress, LINELIST, NULL),
- V(ORPort, UINT, "0"),
+ V(ORPort, PORT, "0"),
V(OutboundBindAddress, STRING, NULL),
OBSOLETE("PathlenCoinWeight"),
V(PerConnBWBurst, MEMUNIT, "0"),
@@ -355,7 +357,7 @@ static config_var_t _option_vars[] = {
V(ShutdownWaitLength, INTERVAL, "30 seconds"),
V(SocksListenAddress, LINELIST, NULL),
V(SocksPolicy, LINELIST, NULL),
- V(SocksPort, UINT, "9050"),
+ V(SocksPort, PORT, "9050"),
V(SocksTimeout, INTERVAL, "2 minutes"),
OBSOLETE("StatusFetchPeriod"),
V(StrictNodes, BOOL, "0"),
@@ -366,7 +368,7 @@ static config_var_t _option_vars[] = {
V(TrackHostExitsExpire, INTERVAL, "30 minutes"),
OBSOLETE("TrafficShaping"),
V(TransListenAddress, LINELIST, NULL),
- V(TransPort, UINT, "0"),
+ V(TransPort, PORT, "0"),
V(TunnelDirConns, BOOL, "1"),
V(UpdateBridgesFromAuthority, BOOL, "0"),
V(UseBridges, BOOL, "0"),
@@ -1689,8 +1691,16 @@ config_assign_value(config_format_t *fmt, or_options_t *options,
switch (var->type) {
+ case CONFIG_TYPE_PORT:
+ if (!strcasecmp(c->value, "auto")) {
+ *(int *)lvalue = CFG_AUTO_PORT;
+ break;
+ }
+ /* fall through */
case CONFIG_TYPE_UINT:
- i = (int)tor_parse_long(c->value, 10, 0, INT_MAX, &ok, NULL);
+ i = (int)tor_parse_long(c->value, 10, 0,
+ var->type==CONFIG_TYPE_PORT ? 65535 : INT_MAX,
+ &ok, NULL);
if (!ok) {
tor_asprintf(msg,
"Int keyword '%s %s' is malformed or out of bounds.",
@@ -1998,6 +2008,12 @@ get_assigned_option(config_format_t *fmt, void *options,
}
escape_val = 0; /* Can't need escape. */
break;
+ case CONFIG_TYPE_PORT:
+ if (*(int*)value == CFG_AUTO_PORT) {
+ result->value = tor_strdup("auto");
+ escape_val = 0;
+ break;
+ }
case CONFIG_TYPE_INTERVAL:
case CONFIG_TYPE_UINT:
/* This means every or_options_t uint or bool element
@@ -2227,6 +2243,7 @@ option_clear(config_format_t *fmt, or_options_t *options, config_var_t *var)
break;
case CONFIG_TYPE_INTERVAL:
case CONFIG_TYPE_UINT:
+ case CONFIG_TYPE_PORT:
case CONFIG_TYPE_BOOL:
*(int*)lvalue = 0;
break;
@@ -2851,9 +2868,6 @@ options_validate(or_options_t *old_options, or_options_t *options,
tor_assert(msg);
*msg = NULL;
- if (options->ORPort < 0 || options->ORPort > 65535)
- REJECT("ORPort option out of bounds.");
-
if (server_mode(options) &&
(!strcmpstart(uname, "Windows 95") ||
!strcmpstart(uname, "Windows 98") ||
@@ -2968,18 +2982,6 @@ options_validate(or_options_t *old_options, or_options_t *options,
REJECT("Can't use a relative path to torrc when RunAsDaemon is set.");
#endif
- if (options->SocksPort < 0 || options->SocksPort > 65535)
- REJECT("SocksPort option out of bounds.");
-
- if (options->DNSPort < 0 || options->DNSPort > 65535)
- REJECT("DNSPort option out of bounds.");
-
- if (options->TransPort < 0 || options->TransPort > 65535)
- REJECT("TransPort option out of bounds.");
-
- if (options->NATDPort < 0 || options->NATDPort > 65535)
- REJECT("NATDPort option out of bounds.");
-
if (options->SocksPort == 0 && options->TransPort == 0 &&
options->NATDPort == 0 && options->ORPort == 0 &&
options->DNSPort == 0 && !options->RendConfigLines)
@@ -2988,12 +2990,6 @@ options_validate(or_options_t *old_options, or_options_t *options,
"undefined, and there aren't any hidden services configured. "
"Tor will still run, but probably won't do anything.");
- if (options->ControlPort < 0 || options->ControlPort > 65535)
- REJECT("ControlPort option out of bounds.");
-
- if (options->DirPort < 0 || options->DirPort > 65535)
- REJECT("DirPort option out of bounds.");
-
#ifndef USE_TRANSPARENT
if (options->TransPort || options->TransListenAddress)
REJECT("TransPort and TransListenAddress are disabled in this build.");
@@ -5238,6 +5234,7 @@ getinfo_helper_config(control_connection_t *conn,
case CONFIG_TYPE_STRING: type = "String"; break;
case CONFIG_TYPE_FILENAME: type = "Filename"; break;
case CONFIG_TYPE_UINT: type = "Integer"; break;
+ case CONFIG_TYPE_PORT: type = "Port"; break;
case CONFIG_TYPE_INTERVAL: type = "TimeInterval"; break;
case CONFIG_TYPE_MEMUNIT: type = "DataSize"; break;
case CONFIG_TYPE_DOUBLE: type = "Float"; break;
diff --git a/src/or/connection.c b/src/or/connection.c
index eaae791..47e5423 100644
--- a/src/or/connection.c
+++ b/src/or/connection.c
@@ -37,7 +37,7 @@
#include "routerparse.h"
static connection_t *connection_create_listener(
- struct sockaddr *listensockaddr,
+ const struct sockaddr *listensockaddr,
socklen_t listensocklen, int type,
char* address);
static void connection_init(time_t now, connection_t *conn, int type,
@@ -759,7 +759,7 @@ connection_expire_held_open(void)
* The listenaddr struct has to be freed by the caller.
*/
static struct sockaddr_in *
-create_inet_sockaddr(const char *listenaddress, uint16_t listenport,
+create_inet_sockaddr(const char *listenaddress, int listenport,
char **readable_address, socklen_t *socklen_out) {
struct sockaddr_in *listenaddr = NULL;
uint32_t addr;
@@ -771,8 +771,10 @@ create_inet_sockaddr(const char *listenaddress, uint16_t listenport,
"Error parsing/resolving ListenAddress %s", listenaddress);
goto err;
}
- if (usePort==0)
- usePort = listenport;
+ if (usePort==0) {
+ if (listenport != CFG_AUTO_PORT)
+ usePort = listenport;
+ }
listenaddr = tor_malloc_zero(sizeof(struct sockaddr_in));
listenaddr->sin_addr.s_addr = htonl(addr);
@@ -858,12 +860,13 @@ warn_too_many_conns(void)
* to the conn.
*/
static connection_t *
-connection_create_listener(struct sockaddr *listensockaddr, socklen_t socklen,
+connection_create_listener(const struct sockaddr *listensockaddr,
+ socklen_t socklen,
int type, char* address)
{
connection_t *conn;
int s; /* the socket we're going to make */
- uint16_t usePort = 0;
+ uint16_t usePort = 0, gotPort = 0;
int start_reading = 0;
if (get_n_open_sockets() >= get_options()->_ConnLimit-1) {
@@ -872,6 +875,7 @@ connection_create_listener(struct sockaddr *listensockaddr, socklen_t socklen,
}
if (listensockaddr->sa_family == AF_INET) {
+ tor_addr_t addr;
int is_tcp = (type != CONN_TYPE_AP_DNS_LISTENER);
#ifndef MS_WINDOWS
int one=1;
@@ -879,11 +883,10 @@ connection_create_listener(struct sockaddr *listensockaddr, socklen_t socklen,
if (is_tcp)
start_reading = 1;
- usePort = ntohs( (uint16_t)
- ((struct sockaddr_in *)listensockaddr)->sin_port);
+ tor_addr_from_sockaddr(&addr, listensockaddr, &usePort);
log_notice(LD_NET, "Opening %s on %s:%d",
- conn_type_to_string(type), address, usePort);
+ conn_type_to_string(type), fmt_addr(&addr), usePort);
s = tor_open_socket(PF_INET,
is_tcp ? SOCK_STREAM : SOCK_DGRAM,
@@ -921,6 +924,21 @@ connection_create_listener(struct sockaddr *listensockaddr, socklen_t socklen,
goto err;
}
}
+
+ if (usePort != 0) {
+ gotPort = usePort;
+ } else {
+ tor_addr_t addr2;
+ struct sockaddr_storage ss;
+ socklen_t ss_len=sizeof(ss);
+ if (getsockname(s, (struct sockaddr*)&ss, &ss_len)<0) {
+ log_warn(LD_NET, "getsockname() couldn't learn address for %s: %s",
+ conn_type_to_string(type),
+ tor_socket_strerror(tor_socket_errno(s)));
+ gotPort = 0;
+ }
+ tor_addr_from_sockaddr(&addr2, (struct sockaddr*)&ss, &gotPort);
+ }
#ifdef HAVE_SYS_UN_H
} else if (listensockaddr->sa_family == AF_UNIX) {
start_reading = 1;
@@ -968,7 +986,7 @@ connection_create_listener(struct sockaddr *listensockaddr, socklen_t socklen,
conn->socket_family = listensockaddr->sa_family;
conn->s = s;
conn->address = tor_strdup(address);
- conn->port = usePort;
+ conn->port = gotPort;
if (connection_add(conn) < 0) { /* no space, forget it */
log_warn(LD_NET,"connection_add for listener failed. Giving up.");
@@ -976,8 +994,9 @@ connection_create_listener(struct sockaddr *listensockaddr, socklen_t socklen,
goto err;
}
- log_debug(LD_NET,"%s listening on port %u.",
- conn_type_to_string(type), usePort);
+ log_fn(usePort==gotPort ? LOG_DEBUG : LOG_NOTICE, LD_NET,
+ "%s listening on port %u.",
+ conn_type_to_string(type), gotPort);
conn->state = LISTENER_STATE_READY;
if (start_reading) {
@@ -1804,7 +1823,7 @@ retry_listeners(int type, config_line_t *cfg,
case AF_INET:
listensockaddr = (struct sockaddr *)
create_inet_sockaddr(cfg_line->value,
- (uint16_t) port_option,
+ port_option,
&address, &listensocklen);
break;
case AF_UNIX:
diff --git a/src/or/or.h b/src/or/or.h
index d667358..0a089f7 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -2353,6 +2353,10 @@ typedef struct config_line_t {
typedef struct routerset_t routerset_t;
+/** A magic value for the (Socks|OR|...)Port options below, telling Tor
+ * to pick its own port. */
+#define CFG_AUTO_PORT 0xc4005e
+
/** Configuration options for a Tor process. */
typedef struct {
uint32_t _magic;
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