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[tor-commits] [tor/master] Merge branch 'ticket31343_029' into ticket31343_035
commit a4400a77a5db2fc60db258857a23a11ec741e426
Merge: 70d0b97ee 878f44090
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date: Thu Aug 8 09:39:48 2019 -0400
Merge branch 'ticket31343_029' into ticket31343_035
src/feature/nodelist/routerlist.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --cc src/feature/nodelist/routerlist.c
index 4a99427cd,000000000..456f930aa
mode 100644,000000..100644
--- a/src/feature/nodelist/routerlist.c
+++ b/src/feature/nodelist/routerlist.c
@@@ -1,3232 -1,0 +1,3234 @@@
+/* 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 routerlist.c
+ * \brief Code to
+ * maintain and access the global list of routerinfos for known
+ * servers.
+ *
+ * A "routerinfo_t" object represents a single self-signed router
+ * descriptor, as generated by a Tor relay in order to tell the rest of
+ * the world about its keys, address, and capabilities. An
+ * "extrainfo_t" object represents an adjunct "extra-info" object,
+ * certified by a corresponding router descriptor, reporting more
+ * information about the relay that nearly all users will not need.
+ *
+ * Most users will not use router descriptors for most relays. Instead,
+ * they use the information in microdescriptors and in the consensus
+ * networkstatus.
+ *
+ * Right now, routerinfo_t objects are used in these ways:
+ * <ul>
+ * <li>By clients, in order to learn about bridge keys and capabilities.
+ * (Bridges aren't listed in the consensus networkstatus, so they
+ * can't have microdescriptors.)
+ * <li>By relays, since relays want more information about other relays
+ * than they can learn from microdescriptors. (TODO: Is this still true?)
+ * <li>By authorities, which receive them and use them to generate the
+ * consensus and the microdescriptors.
+ * <li>By all directory caches, which download them in case somebody
+ * else wants them.
+ * </ul>
+ *
+ * Routerinfos are mostly created by parsing them from a string, in
+ * routerparse.c. We store them to disk on receiving them, and
+ * periodically discard the ones we don't need. On restarting, we
+ * re-read them from disk. (This also applies to extrainfo documents, if
+ * we are configured to fetch them.)
+ *
+ * In order to keep our list of routerinfos up-to-date, we periodically
+ * check whether there are any listed in the latest consensus (or in the
+ * votes from other authorities, if we are an authority) that we don't
+ * have. (This also applies to extrainfo documents, if we are
+ * configured to fetch them.)
+ *
+ * Almost nothing in Tor should use a routerinfo_t to refer directly to
+ * a relay; instead, almost everything should use node_t (implemented in
+ * nodelist.c), which provides a common interface to routerinfo_t,
+ * routerstatus_t, and microdescriptor_t.
+ *
+ * <br>
+ *
+ * This module also has some of the functions used for choosing random
+ * nodes according to different rules and weights. Historically, they
+ * were all in this module. Now, they are spread across this module,
+ * nodelist.c, and networkstatus.c. (TODO: Fix that.)
+ **/
+
+#define ROUTERLIST_PRIVATE
+#include "core/or/or.h"
+
+#include "app/config/config.h"
+#include "core/mainloop/connection.h"
+#include "core/mainloop/mainloop.h"
+#include "core/or/policies.h"
+#include "feature/client/bridges.h"
+#include "feature/control/control.h"
+#include "feature/dirauth/authmode.h"
+#include "feature/dirauth/process_descs.h"
+#include "feature/dirauth/reachability.h"
+#include "feature/dircache/dirserv.h"
+#include "feature/dirclient/dirclient.h"
+#include "feature/dirclient/dlstatus.h"
+#include "feature/dircommon/directory.h"
+#include "feature/nodelist/authcert.h"
+#include "feature/nodelist/describe.h"
+#include "feature/nodelist/dirlist.h"
+#include "feature/nodelist/microdesc.h"
+#include "feature/nodelist/networkstatus.h"
+#include "feature/nodelist/node_select.h"
+#include "feature/nodelist/nodelist.h"
+#include "feature/nodelist/routerinfo.h"
+#include "feature/nodelist/routerlist.h"
+#include "feature/dirparse/routerparse.h"
+#include "feature/nodelist/routerset.h"
+#include "feature/nodelist/torcert.h"
+#include "feature/relay/routermode.h"
+#include "feature/stats/rephist.h"
+#include "lib/crypt_ops/crypto_format.h"
+#include "lib/crypt_ops/crypto_rand.h"
+
+#include "feature/dircommon/dir_connection_st.h"
+#include "feature/dirclient/dir_server_st.h"
+#include "feature/nodelist/document_signature_st.h"
+#include "feature/nodelist/extrainfo_st.h"
+#include "feature/nodelist/networkstatus_st.h"
+#include "feature/nodelist/networkstatus_voter_info_st.h"
+#include "feature/nodelist/node_st.h"
+#include "feature/nodelist/routerinfo_st.h"
+#include "feature/nodelist/routerlist_st.h"
+#include "feature/nodelist/vote_routerstatus_st.h"
+
+#include "lib/crypt_ops/digestset.h"
+
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+
+// #define DEBUG_ROUTERLIST
+
+/****************************************************************************/
+
+/* Typed wrappers for different digestmap types; used to avoid type
+ * confusion. */
+
+DECLARE_TYPED_DIGESTMAP_FNS(sdmap_, digest_sd_map_t, signed_descriptor_t)
+DECLARE_TYPED_DIGESTMAP_FNS(rimap_, digest_ri_map_t, routerinfo_t)
+DECLARE_TYPED_DIGESTMAP_FNS(eimap_, digest_ei_map_t, extrainfo_t)
+#define SDMAP_FOREACH(map, keyvar, valvar) \
+ DIGESTMAP_FOREACH(sdmap_to_digestmap(map), keyvar, signed_descriptor_t *, \
+ valvar)
+#define RIMAP_FOREACH(map, keyvar, valvar) \
+ DIGESTMAP_FOREACH(rimap_to_digestmap(map), keyvar, routerinfo_t *, valvar)
+#define EIMAP_FOREACH(map, keyvar, valvar) \
+ DIGESTMAP_FOREACH(eimap_to_digestmap(map), keyvar, extrainfo_t *, valvar)
+#define eimap_free(map, fn) MAP_FREE_AND_NULL(eimap, (map), (fn))
+#define rimap_free(map, fn) MAP_FREE_AND_NULL(rimap, (map), (fn))
+#define sdmap_free(map, fn) MAP_FREE_AND_NULL(sdmap, (map), (fn))
+
+/* static function prototypes */
+static int signed_desc_digest_is_recognized(signed_descriptor_t *desc);
+static const char *signed_descriptor_get_body_impl(
+ const signed_descriptor_t *desc,
+ int with_annotations);
+static void launch_dummy_descriptor_download_as_needed(time_t now,
+ const or_options_t *options);
+
+/****************************************************************************/
+
+/** Global list of all of the routers that we know about. */
+static routerlist_t *routerlist = NULL;
+
+/** List of strings for nicknames we've already warned about and that are
+ * still unknown / unavailable. */
+static smartlist_t *warned_nicknames = NULL;
+
+/** The last time we tried to download any routerdesc, or 0 for "never". We
+ * use this to rate-limit download attempts when the number of routerdescs to
+ * download is low. */
+static time_t last_descriptor_download_attempted = 0;
+
+/* Router descriptor storage.
+ *
+ * Routerdescs are stored in a big file, named "cached-descriptors". As new
+ * routerdescs arrive, we append them to a journal file named
+ * "cached-descriptors.new".
+ *
+ * From time to time, we replace "cached-descriptors" with a new file
+ * containing only the live, non-superseded descriptors, and clear
+ * cached-routers.new.
+ *
+ * On startup, we read both files.
+ */
+
+/** Helper: return 1 iff the router log is so big we want to rebuild the
+ * store. */
+static int
+router_should_rebuild_store(desc_store_t *store)
+{
+ if (store->store_len > (1<<16))
+ return (store->journal_len > store->store_len / 2 ||
+ store->bytes_dropped > store->store_len / 2);
+ else
+ return store->journal_len > (1<<15);
+}
+
+/** Return the desc_store_t in <b>rl</b> that should be used to store
+ * <b>sd</b>. */
+static inline desc_store_t *
+desc_get_store(routerlist_t *rl, const signed_descriptor_t *sd)
+{
+ if (sd->is_extrainfo)
+ return &rl->extrainfo_store;
+ else
+ return &rl->desc_store;
+}
+
+/** Add the signed_descriptor_t in <b>desc</b> to the router
+ * journal; change its saved_location to SAVED_IN_JOURNAL and set its
+ * offset appropriately. */
+static int
+signed_desc_append_to_journal(signed_descriptor_t *desc,
+ desc_store_t *store)
+{
+ char *fname = get_cachedir_fname_suffix(store->fname_base, ".new");
+ const char *body = signed_descriptor_get_body_impl(desc,1);
+ size_t len = desc->signed_descriptor_len + desc->annotations_len;
+
+ if (append_bytes_to_file(fname, body, len, 1)) {
+ log_warn(LD_FS, "Unable to store router descriptor");
+ tor_free(fname);
+ return -1;
+ }
+ desc->saved_location = SAVED_IN_JOURNAL;
+ tor_free(fname);
+
+ desc->saved_offset = store->journal_len;
+ store->journal_len += len;
+
+ return 0;
+}
+
+/** Sorting helper: return <0, 0, or >0 depending on whether the
+ * signed_descriptor_t* in *<b>a</b> is older, the same age as, or newer than
+ * the signed_descriptor_t* in *<b>b</b>. */
+static int
+compare_signed_descriptors_by_age_(const void **_a, const void **_b)
+{
+ const signed_descriptor_t *r1 = *_a, *r2 = *_b;
+ return (int)(r1->published_on - r2->published_on);
+}
+
+#define RRS_FORCE 1
+#define RRS_DONT_REMOVE_OLD 2
+
+/** If the journal of <b>store</b> is too long, or if RRS_FORCE is set in
+ * <b>flags</b>, then atomically replace the saved router store with the
+ * routers currently in our routerlist, and clear the journal. Unless
+ * RRS_DONT_REMOVE_OLD is set in <b>flags</b>, delete expired routers before
+ * rebuilding the store. Return 0 on success, -1 on failure.
+ */
+static int
+router_rebuild_store(int flags, desc_store_t *store)
+{
+ smartlist_t *chunk_list = NULL;
+ char *fname = NULL, *fname_tmp = NULL;
+ int r = -1;
+ off_t offset = 0;
+ smartlist_t *signed_descriptors = NULL;
+ int nocache=0;
+ size_t total_expected_len = 0;
+ int had_any;
+ int force = flags & RRS_FORCE;
+
+ if (!force && !router_should_rebuild_store(store)) {
+ r = 0;
+ goto done;
+ }
+ if (!routerlist) {
+ r = 0;
+ goto done;
+ }
+
+ if (store->type == EXTRAINFO_STORE)
+ had_any = !eimap_isempty(routerlist->extra_info_map);
+ else
+ had_any = (smartlist_len(routerlist->routers)+
+ smartlist_len(routerlist->old_routers))>0;
+
+ /* Don't save deadweight. */
+ if (!(flags & RRS_DONT_REMOVE_OLD))
+ routerlist_remove_old_routers();
+
+ log_info(LD_DIR, "Rebuilding %s cache", store->description);
+
+ fname = get_cachedir_fname(store->fname_base);
+ fname_tmp = get_cachedir_fname_suffix(store->fname_base, ".tmp");
+
+ chunk_list = smartlist_new();
+
+ /* We sort the routers by age to enhance locality on disk. */
+ signed_descriptors = smartlist_new();
+ if (store->type == EXTRAINFO_STORE) {
+ eimap_iter_t *iter;
+ for (iter = eimap_iter_init(routerlist->extra_info_map);
+ !eimap_iter_done(iter);
+ iter = eimap_iter_next(routerlist->extra_info_map, iter)) {
+ const char *key;
+ extrainfo_t *ei;
+ eimap_iter_get(iter, &key, &ei);
+ smartlist_add(signed_descriptors, &ei->cache_info);
+ }
+ } else {
+ SMARTLIST_FOREACH(routerlist->old_routers, signed_descriptor_t *, sd,
+ smartlist_add(signed_descriptors, sd));
+ SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, ri,
+ smartlist_add(signed_descriptors, &ri->cache_info));
+ }
+
+ smartlist_sort(signed_descriptors, compare_signed_descriptors_by_age_);
+
+ /* Now, add the appropriate members to chunk_list */
+ SMARTLIST_FOREACH_BEGIN(signed_descriptors, signed_descriptor_t *, sd) {
+ sized_chunk_t *c;
+ const char *body = signed_descriptor_get_body_impl(sd, 1);
+ if (!body) {
+ log_warn(LD_BUG, "No descriptor available for router.");
+ goto done;
+ }
+ if (sd->do_not_cache) {
+ ++nocache;
+ continue;
+ }
+ c = tor_malloc(sizeof(sized_chunk_t));
+ c->bytes = body;
+ c->len = sd->signed_descriptor_len + sd->annotations_len;
+ total_expected_len += c->len;
+ smartlist_add(chunk_list, c);
+ } SMARTLIST_FOREACH_END(sd);
+
+ if (write_chunks_to_file(fname_tmp, chunk_list, 1, 1)<0) {
+ log_warn(LD_FS, "Error writing router store to disk.");
+ goto done;
+ }
+
+ /* Our mmap is now invalid. */
+ if (store->mmap) {
+ int res = tor_munmap_file(store->mmap);
+ store->mmap = NULL;
+ if (res != 0) {
+ log_warn(LD_FS, "Unable to munmap route store in %s", fname);
+ }
+ }
+
+ if (replace_file(fname_tmp, fname)<0) {
+ log_warn(LD_FS, "Error replacing old router store: %s", strerror(errno));
+ goto done;
+ }
+
+ errno = 0;
+ store->mmap = tor_mmap_file(fname);
+ if (! store->mmap) {
+ if (errno == ERANGE) {
+ /* empty store.*/
+ if (total_expected_len) {
+ log_warn(LD_FS, "We wrote some bytes to a new descriptor file at '%s',"
+ " but when we went to mmap it, it was empty!", fname);
+ } else if (had_any) {
+ log_info(LD_FS, "We just removed every descriptor in '%s'. This is "
+ "okay if we're just starting up after a long time. "
+ "Otherwise, it's a bug.", fname);
+ }
+ } else {
+ log_warn(LD_FS, "Unable to mmap new descriptor file at '%s'.",fname);
+ }
+ }
+
+ log_info(LD_DIR, "Reconstructing pointers into cache");
+
+ offset = 0;
+ SMARTLIST_FOREACH_BEGIN(signed_descriptors, signed_descriptor_t *, sd) {
+ if (sd->do_not_cache)
+ continue;
+ sd->saved_location = SAVED_IN_CACHE;
+ if (store->mmap) {
+ tor_free(sd->signed_descriptor_body); // sets it to null
+ sd->saved_offset = offset;
+ }
+ offset += sd->signed_descriptor_len + sd->annotations_len;
+ signed_descriptor_get_body(sd); /* reconstruct and assert */
+ } SMARTLIST_FOREACH_END(sd);
+
+ tor_free(fname);
+ fname = get_cachedir_fname_suffix(store->fname_base, ".new");
+ write_str_to_file(fname, "", 1);
+
+ r = 0;
+ store->store_len = (size_t) offset;
+ store->journal_len = 0;
+ store->bytes_dropped = 0;
+ done:
+ smartlist_free(signed_descriptors);
+ tor_free(fname);
+ tor_free(fname_tmp);
+ if (chunk_list) {
+ SMARTLIST_FOREACH(chunk_list, sized_chunk_t *, c, tor_free(c));
+ smartlist_free(chunk_list);
+ }
+
+ return r;
+}
+
+/** Helper: Reload a cache file and its associated journal, setting metadata
+ * appropriately. If <b>extrainfo</b> is true, reload the extrainfo store;
+ * else reload the router descriptor store. */
+static int
+router_reload_router_list_impl(desc_store_t *store)
+{
+ char *fname = NULL, *contents = NULL;
+ struct stat st;
+ int extrainfo = (store->type == EXTRAINFO_STORE);
+ store->journal_len = store->store_len = 0;
+
+ fname = get_cachedir_fname(store->fname_base);
+
+ if (store->mmap) {
+ /* get rid of it first */
+ int res = tor_munmap_file(store->mmap);
+ store->mmap = NULL;
+ if (res != 0) {
+ log_warn(LD_FS, "Failed to munmap %s", fname);
+ tor_free(fname);
+ return -1;
+ }
+ }
+
+ store->mmap = tor_mmap_file(fname);
+ if (store->mmap) {
+ store->store_len = store->mmap->size;
+ if (extrainfo)
+ router_load_extrainfo_from_string(store->mmap->data,
+ store->mmap->data+store->mmap->size,
+ SAVED_IN_CACHE, NULL, 0);
+ else
+ router_load_routers_from_string(store->mmap->data,
+ store->mmap->data+store->mmap->size,
+ SAVED_IN_CACHE, NULL, 0, NULL);
+ }
+
+ tor_free(fname);
+ fname = get_cachedir_fname_suffix(store->fname_base, ".new");
+ /* don't load empty files - we wouldn't get any data, even if we tried */
+ if (file_status(fname) == FN_FILE)
+ contents = read_file_to_str(fname, RFTS_BIN|RFTS_IGNORE_MISSING, &st);
+ if (contents) {
+ if (extrainfo)
+ router_load_extrainfo_from_string(contents, NULL,SAVED_IN_JOURNAL,
+ NULL, 0);
+ else
+ router_load_routers_from_string(contents, NULL, SAVED_IN_JOURNAL,
+ NULL, 0, NULL);
+ store->journal_len = (size_t) st.st_size;
+ tor_free(contents);
+ }
+
+ tor_free(fname);
+
+ if (store->journal_len) {
+ /* Always clear the journal on startup.*/
+ router_rebuild_store(RRS_FORCE, store);
+ } else if (!extrainfo) {
+ /* Don't cache expired routers. (This is in an else because
+ * router_rebuild_store() also calls remove_old_routers().) */
+ routerlist_remove_old_routers();
+ }
+
+ return 0;
+}
+
+/** Load all cached router descriptors and extra-info documents from the
+ * store. Return 0 on success and -1 on failure.
+ */
+int
+router_reload_router_list(void)
+{
+ routerlist_t *rl = router_get_routerlist();
+ if (router_reload_router_list_impl(&rl->desc_store))
+ return -1;
+ if (router_reload_router_list_impl(&rl->extrainfo_store))
+ return -1;
+ return 0;
+}
+
+/* When iterating through the routerlist, can OR address/port preference
+ * and reachability checks be skipped?
+ */
+int
+router_skip_or_reachability(const or_options_t *options, int try_ip_pref)
+{
+ /* Servers always have and prefer IPv4.
+ * And if clients are checking against the firewall for reachability only,
+ * but there's no firewall, don't bother checking */
+ return server_mode(options) || (!try_ip_pref && !firewall_is_fascist_or());
+}
+
+/* When iterating through the routerlist, can Dir address/port preference
+ * and reachability checks be skipped?
+ */
+int
+router_skip_dir_reachability(const or_options_t *options, int try_ip_pref)
+{
+ /* Servers always have and prefer IPv4.
+ * And if clients are checking against the firewall for reachability only,
+ * but there's no firewall, don't bother checking */
+ return server_mode(options) || (!try_ip_pref && !firewall_is_fascist_dir());
+}
+
+/** Return true iff r1 and r2 have the same address and OR port. */
+int
+routers_have_same_or_addrs(const routerinfo_t *r1, const routerinfo_t *r2)
+{
+ return r1->addr == r2->addr && r1->or_port == r2->or_port &&
+ tor_addr_eq(&r1->ipv6_addr, &r2->ipv6_addr) &&
+ r1->ipv6_orport == r2->ipv6_orport;
+}
+
+/** Add every suitable node from our nodelist to <b>sl</b>, so that
+ * we can pick a node for a circuit.
+ */
+void
+router_add_running_nodes_to_smartlist(smartlist_t *sl, int need_uptime,
+ int need_capacity, int need_guard,
+ int need_desc, int pref_addr,
+ int direct_conn)
+{
+ const int check_reach = !router_skip_or_reachability(get_options(),
+ pref_addr);
+ /* XXXX MOVE */
+ SMARTLIST_FOREACH_BEGIN(nodelist_get_list(), const node_t *, node) {
+ if (!node->is_running || !node->is_valid)
+ continue;
+ if (need_desc && !node_has_preferred_descriptor(node, direct_conn))
+ continue;
+ if (node->ri && node->ri->purpose != ROUTER_PURPOSE_GENERAL)
+ continue;
+ if (node_is_unreliable(node, need_uptime, need_capacity, need_guard))
+ continue;
+ /* Don't choose nodes if we are certain they can't do EXTEND2 cells */
+ if (node->rs && !routerstatus_version_supports_extend2_cells(node->rs, 1))
+ continue;
+ /* Don't choose nodes if we are certain they can't do ntor. */
+ if ((node->ri || node->md) && !node_has_curve25519_onion_key(node))
+ continue;
+ /* Choose a node with an OR address that matches the firewall rules */
+ if (direct_conn && check_reach &&
+ !fascist_firewall_allows_node(node,
+ FIREWALL_OR_CONNECTION,
+ pref_addr))
+ continue;
+
+ smartlist_add(sl, (void *)node);
+ } SMARTLIST_FOREACH_END(node);
+}
+
+/** Look through the routerlist until we find a router that has my key.
+ Return it. */
+const routerinfo_t *
+routerlist_find_my_routerinfo(void)
+{
+ if (!routerlist)
+ return NULL;
+
+ SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, router,
+ {
+ if (router_is_me(router))
+ return router;
+ });
+ return NULL;
+}
+
+/** Return the smaller of the router's configured BandwidthRate
+ * and its advertised capacity. */
+uint32_t
+router_get_advertised_bandwidth(const routerinfo_t *router)
+{
+ if (router->bandwidthcapacity < router->bandwidthrate)
+ return router->bandwidthcapacity;
+ return router->bandwidthrate;
+}
+
+/** Do not weight any declared bandwidth more than this much when picking
+ * routers by bandwidth. */
+#define DEFAULT_MAX_BELIEVABLE_BANDWIDTH 10000000 /* 10 MB/sec */
+
+/** Return the smaller of the router's configured BandwidthRate
+ * and its advertised capacity, capped by max-believe-bw. */
+uint32_t
+router_get_advertised_bandwidth_capped(const routerinfo_t *router)
+{
+ uint32_t result = router->bandwidthcapacity;
+ if (result > router->bandwidthrate)
+ result = router->bandwidthrate;
+ if (result > DEFAULT_MAX_BELIEVABLE_BANDWIDTH)
+ result = DEFAULT_MAX_BELIEVABLE_BANDWIDTH;
+ return result;
+}
+
+/** Helper: given an extended nickname in <b>hexdigest</b> try to decode it.
+ * Return 0 on success, -1 on failure. Store the result into the
+ * DIGEST_LEN-byte buffer at <b>digest_out</b>, the single character at
+ * <b>nickname_qualifier_char_out</b>, and the MAXNICKNAME_LEN+1-byte buffer
+ * at <b>nickname_out</b>.
+ *
+ * The recognized format is:
+ * HexName = Dollar? HexDigest NamePart?
+ * Dollar = '?'
+ * HexDigest = HexChar*20
+ * HexChar = 'a'..'f' | 'A'..'F' | '0'..'9'
+ * NamePart = QualChar Name
+ * QualChar = '=' | '~'
+ * Name = NameChar*(1..MAX_NICKNAME_LEN)
+ * NameChar = Any ASCII alphanumeric character
+ */
+int
+hex_digest_nickname_decode(const char *hexdigest,
+ char *digest_out,
+ char *nickname_qualifier_char_out,
+ char *nickname_out)
+{
+ size_t len;
+
+ tor_assert(hexdigest);
+ if (hexdigest[0] == '$')
+ ++hexdigest;
+
+ len = strlen(hexdigest);
+ if (len < HEX_DIGEST_LEN) {
+ return -1;
+ } else if (len > HEX_DIGEST_LEN && (hexdigest[HEX_DIGEST_LEN] == '=' ||
+ hexdigest[HEX_DIGEST_LEN] == '~') &&
+ len <= HEX_DIGEST_LEN+1+MAX_NICKNAME_LEN) {
+ *nickname_qualifier_char_out = hexdigest[HEX_DIGEST_LEN];
+ strlcpy(nickname_out, hexdigest+HEX_DIGEST_LEN+1 , MAX_NICKNAME_LEN+1);
+ } else if (len == HEX_DIGEST_LEN) {
+ ;
+ } else {
+ return -1;
+ }
+
+ if (base16_decode(digest_out, DIGEST_LEN,
+ hexdigest, HEX_DIGEST_LEN) != DIGEST_LEN)
+ return -1;
+ return 0;
+}
+
+/** Helper: Return true iff the <b>identity_digest</b> and <b>nickname</b>
+ * combination of a router, encoded in hexadecimal, matches <b>hexdigest</b>
+ * (which is optionally prefixed with a single dollar sign). Return false if
+ * <b>hexdigest</b> is malformed, or it doesn't match. */
+int
+hex_digest_nickname_matches(const char *hexdigest, const char *identity_digest,
+ const char *nickname)
+{
+ char digest[DIGEST_LEN];
+ char nn_char='\0';
+ char nn_buf[MAX_NICKNAME_LEN+1];
+
+ if (hex_digest_nickname_decode(hexdigest, digest, &nn_char, nn_buf) == -1)
+ return 0;
+
+ if (nn_char == '=') {
+ return 0;
+ }
+
+ if (nn_char == '~') {
+ if (!nickname) // XXX This seems wrong. -NM
+ return 0;
+ if (strcasecmp(nn_buf, nickname))
+ return 0;
+ }
+
+ return tor_memeq(digest, identity_digest, DIGEST_LEN);
+}
+
+/** If hexdigest is correctly formed, base16_decode it into
+ * digest, which must have DIGEST_LEN space in it.
+ * Return 0 on success, -1 on failure.
+ */
+int
+hexdigest_to_digest(const char *hexdigest, char *digest)
+{
+ if (hexdigest[0]=='$')
+ ++hexdigest;
+ if (strlen(hexdigest) < HEX_DIGEST_LEN ||
+ base16_decode(digest,DIGEST_LEN,hexdigest,HEX_DIGEST_LEN) != DIGEST_LEN)
+ return -1;
+ return 0;
+}
+
+/** As router_get_by_id_digest,but return a pointer that you're allowed to
+ * modify */
+routerinfo_t *
+router_get_mutable_by_digest(const char *digest)
+{
+ tor_assert(digest);
+
+ if (!routerlist) return NULL;
+
+ // routerlist_assert_ok(routerlist);
+
+ return rimap_get(routerlist->identity_map, digest);
+}
+
+/** Return the router in our routerlist whose 20-byte key digest
+ * is <b>digest</b>. Return NULL if no such router is known. */
+const routerinfo_t *
+router_get_by_id_digest(const char *digest)
+{
+ return router_get_mutable_by_digest(digest);
+}
+
+/** Return the router in our routerlist whose 20-byte descriptor
+ * is <b>digest</b>. Return NULL if no such router is known. */
+signed_descriptor_t *
+router_get_by_descriptor_digest(const char *digest)
+{
+ tor_assert(digest);
+
+ if (!routerlist) return NULL;
+
+ return sdmap_get(routerlist->desc_digest_map, digest);
+}
+
+/** Return the signed descriptor for the router in our routerlist whose
+ * 20-byte extra-info digest is <b>digest</b>. Return NULL if no such router
+ * is known. */
+MOCK_IMPL(signed_descriptor_t *,
+router_get_by_extrainfo_digest,(const char *digest))
+{
+ tor_assert(digest);
+
+ if (!routerlist) return NULL;
+
+ return sdmap_get(routerlist->desc_by_eid_map, digest);
+}
+
+/** Return the signed descriptor for the extrainfo_t in our routerlist whose
+ * extra-info-digest is <b>digest</b>. Return NULL if no such extra-info
+ * document is known. */
+MOCK_IMPL(signed_descriptor_t *,
+extrainfo_get_by_descriptor_digest,(const char *digest))
+{
+ extrainfo_t *ei;
+ tor_assert(digest);
+ if (!routerlist) return NULL;
+ ei = eimap_get(routerlist->extra_info_map, digest);
+ return ei ? &ei->cache_info : NULL;
+}
+
+/** Return a pointer to the signed textual representation of a descriptor.
+ * The returned string is not guaranteed to be NUL-terminated: the string's
+ * length will be in desc-\>signed_descriptor_len.
+ *
+ * If <b>with_annotations</b> is set, the returned string will include
+ * the annotations
+ * (if any) preceding the descriptor. This will increase the length of the
+ * string by desc-\>annotations_len.
+ *
+ * The caller must not free the string returned.
+ */
+static const char *
+signed_descriptor_get_body_impl(const signed_descriptor_t *desc,
+ int with_annotations)
+{
+ const char *r = NULL;
+ size_t len = desc->signed_descriptor_len;
+ off_t offset = desc->saved_offset;
+ if (with_annotations)
+ len += desc->annotations_len;
+ else
+ offset += desc->annotations_len;
+
+ tor_assert(len > 32);
+ if (desc->saved_location == SAVED_IN_CACHE && routerlist) {
+ desc_store_t *store = desc_get_store(router_get_routerlist(), desc);
+ if (store && store->mmap) {
+ tor_assert(desc->saved_offset + len <= store->mmap->size);
+ r = store->mmap->data + offset;
+ } else if (store) {
+ log_err(LD_DIR, "We couldn't read a descriptor that is supposedly "
+ "mmaped in our cache. Is another process running in our data "
+ "directory? Exiting.");
+ exit(1); // XXXX bad exit: should recover.
+ }
+ }
+ if (!r) /* no mmap, or not in cache. */
+ r = desc->signed_descriptor_body +
+ (with_annotations ? 0 : desc->annotations_len);
+
+ tor_assert(r);
+ if (!with_annotations) {
+ if (fast_memcmp("router ", r, 7) && fast_memcmp("extra-info ", r, 11)) {
+ char *cp = tor_strndup(r, 64);
+ log_err(LD_DIR, "descriptor at %p begins with unexpected string %s. "
+ "Is another process running in our data directory? Exiting.",
+ desc, escaped(cp));
+ exit(1); // XXXX bad exit: should recover.
+ }
+ }
+
+ return r;
+}
+
+/** Return a pointer to the signed textual representation of a descriptor.
+ * The returned string is not guaranteed to be NUL-terminated: the string's
+ * length will be in desc-\>signed_descriptor_len.
+ *
+ * The caller must not free the string returned.
+ */
+const char *
+signed_descriptor_get_body(const signed_descriptor_t *desc)
+{
+ return signed_descriptor_get_body_impl(desc, 0);
+}
+
+/** As signed_descriptor_get_body(), but points to the beginning of the
+ * annotations section rather than the beginning of the descriptor. */
+const char *
+signed_descriptor_get_annotations(const signed_descriptor_t *desc)
+{
+ return signed_descriptor_get_body_impl(desc, 1);
+}
+
+/** Return the current list of all known routers. */
+routerlist_t *
+router_get_routerlist(void)
+{
+ if (PREDICT_UNLIKELY(!routerlist)) {
+ routerlist = tor_malloc_zero(sizeof(routerlist_t));
+ routerlist->routers = smartlist_new();
+ routerlist->old_routers = smartlist_new();
+ routerlist->identity_map = rimap_new();
+ routerlist->desc_digest_map = sdmap_new();
+ routerlist->desc_by_eid_map = sdmap_new();
+ routerlist->extra_info_map = eimap_new();
+
+ routerlist->desc_store.fname_base = "cached-descriptors";
+ routerlist->extrainfo_store.fname_base = "cached-extrainfo";
+
+ routerlist->desc_store.type = ROUTER_STORE;
+ routerlist->extrainfo_store.type = EXTRAINFO_STORE;
+
+ routerlist->desc_store.description = "router descriptors";
+ routerlist->extrainfo_store.description = "extra-info documents";
+ }
+ return routerlist;
+}
+
+/** Free all storage held by <b>router</b>. */
+void
+routerinfo_free_(routerinfo_t *router)
+{
+ if (!router)
+ return;
+
+ tor_free(router->cache_info.signed_descriptor_body);
+ tor_free(router->nickname);
+ tor_free(router->platform);
+ tor_free(router->protocol_list);
+ tor_free(router->contact_info);
+ if (router->onion_pkey)
+ tor_free(router->onion_pkey);
+ tor_free(router->onion_curve25519_pkey);
+ if (router->identity_pkey)
+ crypto_pk_free(router->identity_pkey);
+ tor_cert_free(router->cache_info.signing_key_cert);
+ if (router->declared_family) {
+ SMARTLIST_FOREACH(router->declared_family, char *, s, tor_free(s));
+ smartlist_free(router->declared_family);
+ }
+ addr_policy_list_free(router->exit_policy);
+ short_policy_free(router->ipv6_exit_policy);
+
+ memset(router, 77, sizeof(routerinfo_t));
+
+ tor_free(router);
+}
+
+/** Release all storage held by <b>extrainfo</b> */
+void
+extrainfo_free_(extrainfo_t *extrainfo)
+{
+ if (!extrainfo)
+ return;
+ tor_cert_free(extrainfo->cache_info.signing_key_cert);
+ tor_free(extrainfo->cache_info.signed_descriptor_body);
+ tor_free(extrainfo->pending_sig);
+
+ memset(extrainfo, 88, sizeof(extrainfo_t)); /* debug bad memory usage */
+ tor_free(extrainfo);
+}
+
+#define signed_descriptor_free(val) \
+ FREE_AND_NULL(signed_descriptor_t, signed_descriptor_free_, (val))
+
+/** Release storage held by <b>sd</b>. */
+static void
+signed_descriptor_free_(signed_descriptor_t *sd)
+{
+ if (!sd)
+ return;
+
+ tor_free(sd->signed_descriptor_body);
+ tor_cert_free(sd->signing_key_cert);
+
+ memset(sd, 99, sizeof(signed_descriptor_t)); /* Debug bad mem usage */
+ tor_free(sd);
+}
+
+/** Reset the given signed descriptor <b>sd</b> by freeing the allocated
+ * memory inside the object and by zeroing its content. */
+static void
+signed_descriptor_reset(signed_descriptor_t *sd)
+{
+ tor_assert(sd);
+ tor_free(sd->signed_descriptor_body);
+ tor_cert_free(sd->signing_key_cert);
+ memset(sd, 0, sizeof(*sd));
+}
+
+/** Copy src into dest, and steal all references inside src so that when
+ * we free src, we don't mess up dest. */
+static void
+signed_descriptor_move(signed_descriptor_t *dest,
+ signed_descriptor_t *src)
+{
+ tor_assert(dest != src);
+ /* Cleanup destination object before overwriting it.*/
+ signed_descriptor_reset(dest);
+ memcpy(dest, src, sizeof(signed_descriptor_t));
+ src->signed_descriptor_body = NULL;
+ src->signing_key_cert = NULL;
+ dest->routerlist_index = -1;
+}
+
+/** Extract a signed_descriptor_t from a general routerinfo, and free the
+ * routerinfo.
+ */
+static signed_descriptor_t *
+signed_descriptor_from_routerinfo(routerinfo_t *ri)
+{
+ signed_descriptor_t *sd;
+ tor_assert(ri->purpose == ROUTER_PURPOSE_GENERAL);
+ sd = tor_malloc_zero(sizeof(signed_descriptor_t));
+ signed_descriptor_move(sd, &ri->cache_info);
+ routerinfo_free(ri);
+ return sd;
+}
+
+/** Helper: free the storage held by the extrainfo_t in <b>e</b>. */
+static void
+extrainfo_free_void(void *e)
+{
+ extrainfo_free_(e);
+}
+
+/** Free all storage held by a routerlist <b>rl</b>. */
+void
+routerlist_free_(routerlist_t *rl)
+{
+ if (!rl)
+ return;
+ rimap_free(rl->identity_map, NULL);
+ sdmap_free(rl->desc_digest_map, NULL);
+ sdmap_free(rl->desc_by_eid_map, NULL);
+ eimap_free(rl->extra_info_map, extrainfo_free_void);
+ SMARTLIST_FOREACH(rl->routers, routerinfo_t *, r,
+ routerinfo_free(r));
+ SMARTLIST_FOREACH(rl->old_routers, signed_descriptor_t *, sd,
+ signed_descriptor_free(sd));
+ smartlist_free(rl->routers);
+ smartlist_free(rl->old_routers);
+ if (rl->desc_store.mmap) {
+ int res = tor_munmap_file(routerlist->desc_store.mmap);
+ if (res != 0) {
+ log_warn(LD_FS, "Failed to munmap routerlist->desc_store.mmap");
+ }
+ }
+ if (rl->extrainfo_store.mmap) {
+ int res = tor_munmap_file(routerlist->extrainfo_store.mmap);
+ if (res != 0) {
+ log_warn(LD_FS, "Failed to munmap routerlist->extrainfo_store.mmap");
+ }
+ }
+ tor_free(rl);
+
+ router_dir_info_changed();
+}
+
+/** Log information about how much memory is being used for routerlist,
+ * at log level <b>severity</b>. */
+void
+dump_routerlist_mem_usage(int severity)
+{
+ uint64_t livedescs = 0;
+ uint64_t olddescs = 0;
+ if (!routerlist)
+ return;
+ SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, r,
+ livedescs += r->cache_info.signed_descriptor_len);
+ SMARTLIST_FOREACH(routerlist->old_routers, signed_descriptor_t *, sd,
+ olddescs += sd->signed_descriptor_len);
+
+ tor_log(severity, LD_DIR,
+ "In %d live descriptors: %"PRIu64" bytes. "
+ "In %d old descriptors: %"PRIu64" bytes.",
+ smartlist_len(routerlist->routers), (livedescs),
+ smartlist_len(routerlist->old_routers), (olddescs));
+}
+
+/** Debugging helper: If <b>idx</b> is nonnegative, assert that <b>ri</b> is
+ * in <b>sl</b> at position <b>idx</b>. Otherwise, search <b>sl</b> for
+ * <b>ri</b>. Return the index of <b>ri</b> in <b>sl</b>, or -1 if <b>ri</b>
+ * is not in <b>sl</b>. */
+static inline int
+routerlist_find_elt_(smartlist_t *sl, void *ri, int idx)
+{
+ if (idx < 0) {
+ idx = -1;
+ SMARTLIST_FOREACH(sl, routerinfo_t *, r,
+ if (r == ri) {
+ idx = r_sl_idx;
+ break;
+ });
+ } else {
+ tor_assert(idx < smartlist_len(sl));
+ tor_assert(smartlist_get(sl, idx) == ri);
+ };
+ return idx;
+}
+
+/** Insert an item <b>ri</b> into the routerlist <b>rl</b>, updating indices
+ * as needed. There must be no previous member of <b>rl</b> with the same
+ * identity digest as <b>ri</b>: If there is, call routerlist_replace
+ * instead.
+ */
+static void
+routerlist_insert(routerlist_t *rl, routerinfo_t *ri)
+{
+ routerinfo_t *ri_old;
+ signed_descriptor_t *sd_old;
+ {
+ const routerinfo_t *ri_generated = router_get_my_routerinfo();
+ tor_assert(ri_generated != ri);
+ }
+ tor_assert(ri->cache_info.routerlist_index == -1);
+
+ ri_old = rimap_set(rl->identity_map, ri->cache_info.identity_digest, ri);
+ tor_assert(!ri_old);
+
+ sd_old = sdmap_set(rl->desc_digest_map,
+ ri->cache_info.signed_descriptor_digest,
+ &(ri->cache_info));
+ if (sd_old) {
+ int idx = sd_old->routerlist_index;
+ sd_old->routerlist_index = -1;
+ smartlist_del(rl->old_routers, idx);
+ if (idx < smartlist_len(rl->old_routers)) {
+ signed_descriptor_t *d = smartlist_get(rl->old_routers, idx);
+ d->routerlist_index = idx;
+ }
+ rl->desc_store.bytes_dropped += sd_old->signed_descriptor_len;
+ sdmap_remove(rl->desc_by_eid_map, sd_old->extra_info_digest);
+ signed_descriptor_free(sd_old);
+ }
+
+ if (!tor_digest_is_zero(ri->cache_info.extra_info_digest))
+ sdmap_set(rl->desc_by_eid_map, ri->cache_info.extra_info_digest,
+ &ri->cache_info);
+ smartlist_add(rl->routers, ri);
+ ri->cache_info.routerlist_index = smartlist_len(rl->routers) - 1;
+ nodelist_set_routerinfo(ri, NULL);
+ router_dir_info_changed();
+#ifdef DEBUG_ROUTERLIST
+ routerlist_assert_ok(rl);
+#endif
+}
+
+/** Adds the extrainfo_t <b>ei</b> to the routerlist <b>rl</b>, if there is a
+ * corresponding router in rl-\>routers or rl-\>old_routers. Return the status
+ * of inserting <b>ei</b>. Free <b>ei</b> if it isn't inserted. */
+MOCK_IMPL(STATIC was_router_added_t,
+extrainfo_insert,(routerlist_t *rl, extrainfo_t *ei, int warn_if_incompatible))
+{
+ was_router_added_t r;
+ const char *compatibility_error_msg;
+ routerinfo_t *ri = rimap_get(rl->identity_map,
+ ei->cache_info.identity_digest);
+ signed_descriptor_t *sd =
+ sdmap_get(rl->desc_by_eid_map, ei->cache_info.signed_descriptor_digest);
+ extrainfo_t *ei_tmp;
+ const int severity = warn_if_incompatible ? LOG_WARN : LOG_INFO;
+
+ {
+ extrainfo_t *ei_generated = router_get_my_extrainfo();
+ tor_assert(ei_generated != ei);
+ }
+
+ if (!ri) {
+ /* This router is unknown; we can't even verify the signature. Give up.*/
+ r = ROUTER_NOT_IN_CONSENSUS;
+ goto done;
+ }
+ if (! sd) {
+ /* The extrainfo router doesn't have a known routerdesc to attach it to.
+ * This just won't work. */;
+ static ratelim_t no_sd_ratelim = RATELIM_INIT(1800);
+ r = ROUTER_BAD_EI;
+ log_fn_ratelim(&no_sd_ratelim, severity, LD_BUG,
+ "No entry found in extrainfo map.");
+ goto done;
+ }
+ if (tor_memneq(ei->cache_info.signed_descriptor_digest,
+ sd->extra_info_digest, DIGEST_LEN)) {
+ static ratelim_t digest_mismatch_ratelim = RATELIM_INIT(1800);
+ /* The sd we got from the map doesn't match the digest we used to look
+ * it up. This makes no sense. */
+ r = ROUTER_BAD_EI;
+ log_fn_ratelim(&digest_mismatch_ratelim, severity, LD_BUG,
+ "Mismatch in digest in extrainfo map.");
+ goto done;
+ }
+ if (routerinfo_incompatible_with_extrainfo(ri->identity_pkey, ei, sd,
+ &compatibility_error_msg)) {
+ char d1[HEX_DIGEST_LEN+1], d2[HEX_DIGEST_LEN+1];
+ r = (ri->cache_info.extrainfo_is_bogus) ?
+ ROUTER_BAD_EI : ROUTER_NOT_IN_CONSENSUS;
+
+ base16_encode(d1, sizeof(d1), ri->cache_info.identity_digest, DIGEST_LEN);
+ base16_encode(d2, sizeof(d2), ei->cache_info.identity_digest, DIGEST_LEN);
+
+ log_fn(severity,LD_DIR,
+ "router info incompatible with extra info (ri id: %s, ei id %s, "
+ "reason: %s)", d1, d2, compatibility_error_msg);
+
+ goto done;
+ }
+
+ /* Okay, if we make it here, we definitely have a router corresponding to
+ * this extrainfo. */
+
+ ei_tmp = eimap_set(rl->extra_info_map,
+ ei->cache_info.signed_descriptor_digest,
+ ei);
+ r = ROUTER_ADDED_SUCCESSFULLY;
+ if (ei_tmp) {
+ rl->extrainfo_store.bytes_dropped +=
+ ei_tmp->cache_info.signed_descriptor_len;
+ extrainfo_free(ei_tmp);
+ }
+
+ done:
+ if (r != ROUTER_ADDED_SUCCESSFULLY)
+ extrainfo_free(ei);
+
+#ifdef DEBUG_ROUTERLIST
+ routerlist_assert_ok(rl);
+#endif
+ return r;
+}
+
+#define should_cache_old_descriptors() \
+ directory_caches_dir_info(get_options())
+
+/** If we're a directory cache and routerlist <b>rl</b> doesn't have
+ * a copy of router <b>ri</b> yet, add it to the list of old (not
+ * recommended but still served) descriptors. Else free it. */
+static void
+routerlist_insert_old(routerlist_t *rl, routerinfo_t *ri)
+{
+ {
+ const routerinfo_t *ri_generated = router_get_my_routerinfo();
+ tor_assert(ri_generated != ri);
+ }
+ tor_assert(ri->cache_info.routerlist_index == -1);
+
+ if (should_cache_old_descriptors() &&
+ ri->purpose == ROUTER_PURPOSE_GENERAL &&
+ !sdmap_get(rl->desc_digest_map,
+ ri->cache_info.signed_descriptor_digest)) {
+ signed_descriptor_t *sd = signed_descriptor_from_routerinfo(ri);
+ sdmap_set(rl->desc_digest_map, sd->signed_descriptor_digest, sd);
+ smartlist_add(rl->old_routers, sd);
+ sd->routerlist_index = smartlist_len(rl->old_routers)-1;
+ if (!tor_digest_is_zero(sd->extra_info_digest))
+ sdmap_set(rl->desc_by_eid_map, sd->extra_info_digest, sd);
+ } else {
+ routerinfo_free(ri);
+ }
+#ifdef DEBUG_ROUTERLIST
+ routerlist_assert_ok(rl);
+#endif
+}
+
+/** Remove an item <b>ri</b> from the routerlist <b>rl</b>, updating indices
+ * as needed. If <b>idx</b> is nonnegative and smartlist_get(rl->routers,
+ * idx) == ri, we don't need to do a linear search over the list to decide
+ * which to remove. We fill the gap in rl->routers with a later element in
+ * the list, if any exists. <b>ri</b> is freed.
+ *
+ * If <b>make_old</b> is true, instead of deleting the router, we try adding
+ * it to rl->old_routers. */
+void
+routerlist_remove(routerlist_t *rl, routerinfo_t *ri, int make_old, time_t now)
+{
+ routerinfo_t *ri_tmp;
+ extrainfo_t *ei_tmp;
+ int idx = ri->cache_info.routerlist_index;
+ tor_assert(0 <= idx && idx < smartlist_len(rl->routers));
+ tor_assert(smartlist_get(rl->routers, idx) == ri);
+
+ nodelist_remove_routerinfo(ri);
+
+ /* make sure the rephist module knows that it's not running */
+ rep_hist_note_router_unreachable(ri->cache_info.identity_digest, now);
+
+ ri->cache_info.routerlist_index = -1;
+ smartlist_del(rl->routers, idx);
+ if (idx < smartlist_len(rl->routers)) {
+ routerinfo_t *r = smartlist_get(rl->routers, idx);
+ r->cache_info.routerlist_index = idx;
+ }
+
+ ri_tmp = rimap_remove(rl->identity_map, ri->cache_info.identity_digest);
+ router_dir_info_changed();
+ tor_assert(ri_tmp == ri);
+
+ if (make_old && should_cache_old_descriptors() &&
+ ri->purpose == ROUTER_PURPOSE_GENERAL) {
+ signed_descriptor_t *sd;
+ sd = signed_descriptor_from_routerinfo(ri);
+ smartlist_add(rl->old_routers, sd);
+ sd->routerlist_index = smartlist_len(rl->old_routers)-1;
+ sdmap_set(rl->desc_digest_map, sd->signed_descriptor_digest, sd);
+ if (!tor_digest_is_zero(sd->extra_info_digest))
+ sdmap_set(rl->desc_by_eid_map, sd->extra_info_digest, sd);
+ } else {
+ signed_descriptor_t *sd_tmp;
+ sd_tmp = sdmap_remove(rl->desc_digest_map,
+ ri->cache_info.signed_descriptor_digest);
+ tor_assert(sd_tmp == &(ri->cache_info));
+ rl->desc_store.bytes_dropped += ri->cache_info.signed_descriptor_len;
+ ei_tmp = eimap_remove(rl->extra_info_map,
+ ri->cache_info.extra_info_digest);
+ if (ei_tmp) {
+ rl->extrainfo_store.bytes_dropped +=
+ ei_tmp->cache_info.signed_descriptor_len;
+ extrainfo_free(ei_tmp);
+ }
+ if (!tor_digest_is_zero(ri->cache_info.extra_info_digest))
+ sdmap_remove(rl->desc_by_eid_map, ri->cache_info.extra_info_digest);
+ routerinfo_free(ri);
+ }
+#ifdef DEBUG_ROUTERLIST
+ routerlist_assert_ok(rl);
+#endif
+}
+
+/** Remove a signed_descriptor_t <b>sd</b> from <b>rl</b>-\>old_routers, and
+ * adjust <b>rl</b> as appropriate. <b>idx</b> is -1, or the index of
+ * <b>sd</b>. */
+static void
+routerlist_remove_old(routerlist_t *rl, signed_descriptor_t *sd, int idx)
+{
+ signed_descriptor_t *sd_tmp;
+ extrainfo_t *ei_tmp;
+ desc_store_t *store;
+ if (idx == -1) {
+ idx = sd->routerlist_index;
+ }
+ tor_assert(0 <= idx && idx < smartlist_len(rl->old_routers));
+ /* XXXX edmanm's bridge relay triggered the following assert while
+ * running 0.2.0.12-alpha. If anybody triggers this again, see if we
+ * can get a backtrace. */
+ tor_assert(smartlist_get(rl->old_routers, idx) == sd);
+ tor_assert(idx == sd->routerlist_index);
+
+ sd->routerlist_index = -1;
+ smartlist_del(rl->old_routers, idx);
+ if (idx < smartlist_len(rl->old_routers)) {
+ signed_descriptor_t *d = smartlist_get(rl->old_routers, idx);
+ d->routerlist_index = idx;
+ }
+ sd_tmp = sdmap_remove(rl->desc_digest_map,
+ sd->signed_descriptor_digest);
+ tor_assert(sd_tmp == sd);
+ store = desc_get_store(rl, sd);
+ if (store)
+ store->bytes_dropped += sd->signed_descriptor_len;
+
+ ei_tmp = eimap_remove(rl->extra_info_map,
+ sd->extra_info_digest);
+ if (ei_tmp) {
+ rl->extrainfo_store.bytes_dropped +=
+ ei_tmp->cache_info.signed_descriptor_len;
+ extrainfo_free(ei_tmp);
+ }
+ if (!tor_digest_is_zero(sd->extra_info_digest))
+ sdmap_remove(rl->desc_by_eid_map, sd->extra_info_digest);
+
+ signed_descriptor_free(sd);
+#ifdef DEBUG_ROUTERLIST
+ routerlist_assert_ok(rl);
+#endif
+}
+
+/** Remove <b>ri_old</b> from the routerlist <b>rl</b>, and replace it with
+ * <b>ri_new</b>, updating all index info. If <b>idx</b> is nonnegative and
+ * smartlist_get(rl->routers, idx) == ri, we don't need to do a linear
+ * search over the list to decide which to remove. We put ri_new in the same
+ * index as ri_old, if possible. ri is freed as appropriate.
+ *
+ * If should_cache_descriptors() is true, instead of deleting the router,
+ * we add it to rl->old_routers. */
+static void
+routerlist_replace(routerlist_t *rl, routerinfo_t *ri_old,
+ routerinfo_t *ri_new)
+{
+ int idx;
+ int same_descriptors;
+
+ routerinfo_t *ri_tmp;
+ extrainfo_t *ei_tmp;
+ {
+ const routerinfo_t *ri_generated = router_get_my_routerinfo();
+ tor_assert(ri_generated != ri_new);
+ }
+ tor_assert(ri_old != ri_new);
+ tor_assert(ri_new->cache_info.routerlist_index == -1);
+
+ idx = ri_old->cache_info.routerlist_index;
+ tor_assert(0 <= idx && idx < smartlist_len(rl->routers));
+ tor_assert(smartlist_get(rl->routers, idx) == ri_old);
+
+ {
+ routerinfo_t *ri_old_tmp=NULL;
+ nodelist_set_routerinfo(ri_new, &ri_old_tmp);
+ tor_assert(ri_old == ri_old_tmp);
+ }
+
+ router_dir_info_changed();
+ if (idx >= 0) {
+ smartlist_set(rl->routers, idx, ri_new);
+ ri_old->cache_info.routerlist_index = -1;
+ ri_new->cache_info.routerlist_index = idx;
+ /* Check that ri_old is not in rl->routers anymore: */
+ tor_assert( routerlist_find_elt_(rl->routers, ri_old, -1) == -1 );
+ } else {
+ log_warn(LD_BUG, "Appending entry from routerlist_replace.");
+ routerlist_insert(rl, ri_new);
+ return;
+ }
+ if (tor_memneq(ri_old->cache_info.identity_digest,
+ ri_new->cache_info.identity_digest, DIGEST_LEN)) {
+ /* digests don't match; digestmap_set won't replace */
+ rimap_remove(rl->identity_map, ri_old->cache_info.identity_digest);
+ }
+ ri_tmp = rimap_set(rl->identity_map,
+ ri_new->cache_info.identity_digest, ri_new);
+ tor_assert(!ri_tmp || ri_tmp == ri_old);
+ sdmap_set(rl->desc_digest_map,
+ ri_new->cache_info.signed_descriptor_digest,
+ &(ri_new->cache_info));
+
+ if (!tor_digest_is_zero(ri_new->cache_info.extra_info_digest)) {
+ sdmap_set(rl->desc_by_eid_map, ri_new->cache_info.extra_info_digest,
+ &ri_new->cache_info);
+ }
+
+ same_descriptors = tor_memeq(ri_old->cache_info.signed_descriptor_digest,
+ ri_new->cache_info.signed_descriptor_digest,
+ DIGEST_LEN);
+
+ if (should_cache_old_descriptors() &&
+ ri_old->purpose == ROUTER_PURPOSE_GENERAL &&
+ !same_descriptors) {
+ /* ri_old is going to become a signed_descriptor_t and go into
+ * old_routers */
+ signed_descriptor_t *sd = signed_descriptor_from_routerinfo(ri_old);
+ smartlist_add(rl->old_routers, sd);
+ sd->routerlist_index = smartlist_len(rl->old_routers)-1;
+ sdmap_set(rl->desc_digest_map, sd->signed_descriptor_digest, sd);
+ if (!tor_digest_is_zero(sd->extra_info_digest))
+ sdmap_set(rl->desc_by_eid_map, sd->extra_info_digest, sd);
+ } else {
+ /* We're dropping ri_old. */
+ if (!same_descriptors) {
+ /* digests don't match; The sdmap_set above didn't replace */
+ sdmap_remove(rl->desc_digest_map,
+ ri_old->cache_info.signed_descriptor_digest);
+
+ if (tor_memneq(ri_old->cache_info.extra_info_digest,
+ ri_new->cache_info.extra_info_digest, DIGEST_LEN)) {
+ ei_tmp = eimap_remove(rl->extra_info_map,
+ ri_old->cache_info.extra_info_digest);
+ if (ei_tmp) {
+ rl->extrainfo_store.bytes_dropped +=
+ ei_tmp->cache_info.signed_descriptor_len;
+ extrainfo_free(ei_tmp);
+ }
+ }
+
+ if (!tor_digest_is_zero(ri_old->cache_info.extra_info_digest)) {
+ sdmap_remove(rl->desc_by_eid_map,
+ ri_old->cache_info.extra_info_digest);
+ }
+ }
+ rl->desc_store.bytes_dropped += ri_old->cache_info.signed_descriptor_len;
+ routerinfo_free(ri_old);
+ }
+#ifdef DEBUG_ROUTERLIST
+ routerlist_assert_ok(rl);
+#endif
+}
+
+/** Extract the descriptor <b>sd</b> from old_routerlist, and re-parse
+ * it as a fresh routerinfo_t. */
+static routerinfo_t *
+routerlist_reparse_old(routerlist_t *rl, signed_descriptor_t *sd)
+{
+ routerinfo_t *ri;
+ const char *body;
+
+ body = signed_descriptor_get_annotations(sd);
+
+ ri = router_parse_entry_from_string(body,
+ body+sd->signed_descriptor_len+sd->annotations_len,
+ 0, 1, NULL, NULL);
+ if (!ri)
+ return NULL;
+ signed_descriptor_move(&ri->cache_info, sd);
+
+ routerlist_remove_old(rl, sd, -1);
+
+ return ri;
+}
+
+/** Free all memory held by the routerlist module.
+ * Note: Calling routerlist_free_all() should always be paired with
+ * a call to nodelist_free_all(). These should only be called during
+ * cleanup.
+ */
+void
+routerlist_free_all(void)
+{
+ routerlist_free(routerlist);
+ routerlist = NULL;
+ dirlist_free_all();
+ if (warned_nicknames) {
+ SMARTLIST_FOREACH(warned_nicknames, char *, cp, tor_free(cp));
+ smartlist_free(warned_nicknames);
+ warned_nicknames = NULL;
+ }
+ authcert_free_all();
+}
+
+/** Forget that we have issued any router-related warnings, so that we'll
+ * warn again if we see the same errors. */
+void
+routerlist_reset_warnings(void)
+{
+ if (!warned_nicknames)
+ warned_nicknames = smartlist_new();
+ SMARTLIST_FOREACH(warned_nicknames, char *, cp, tor_free(cp));
+ smartlist_clear(warned_nicknames); /* now the list is empty. */
+
+ networkstatus_reset_warnings();
+}
+
+/** Return 1 if the signed descriptor of this router is older than
+ * <b>seconds</b> seconds. Otherwise return 0. */
+MOCK_IMPL(int,
+router_descriptor_is_older_than,(const routerinfo_t *router, int seconds))
+{
+ return router->cache_info.published_on < approx_time() - seconds;
+}
+
+/** Add <b>router</b> to the routerlist, if we don't already have it. Replace
+ * older entries (if any) with the same key. Note: Callers should not hold
+ * their pointers to <b>router</b> if this function fails; <b>router</b>
+ * will either be inserted into the routerlist or freed. Similarly, even
+ * if this call succeeds, they should not hold their pointers to
+ * <b>router</b> after subsequent calls with other routerinfo's -- they
+ * might cause the original routerinfo to get freed.
+ *
+ * Returns the status for the operation. Might set *<b>msg</b> if it wants
+ * the poster of the router to know something.
+ *
+ * If <b>from_cache</b>, this descriptor came from our disk cache. If
+ * <b>from_fetch</b>, we received it in response to a request we made.
+ * (If both are false, that means it was uploaded to us as an auth dir
+ * server or via the controller.)
+ *
+ * This function should be called *after*
+ * routers_update_status_from_consensus_networkstatus; subsequently, you
+ * should call router_rebuild_store and routerlist_descriptors_added.
+ */
+was_router_added_t
+router_add_to_routerlist(routerinfo_t *router, const char **msg,
+ int from_cache, int from_fetch)
+{
+ const char *id_digest;
+ const or_options_t *options = get_options();
+ int authdir = authdir_mode_handles_descs(options, router->purpose);
+ int authdir_believes_valid = 0;
+ routerinfo_t *old_router;
+ networkstatus_t *consensus =
+ networkstatus_get_latest_consensus_by_flavor(FLAV_NS);
+ int in_consensus = 0;
+
+ tor_assert(msg);
+
+ if (!routerlist)
+ router_get_routerlist();
+
+ id_digest = router->cache_info.identity_digest;
+
+ old_router = router_get_mutable_by_digest(id_digest);
+
+ /* Make sure that it isn't expired. */
+ if (router->cert_expiration_time < approx_time()) {
+ routerinfo_free(router);
+ *msg = "Some certs on this router are expired.";
+ return ROUTER_CERTS_EXPIRED;
+ }
+
+ /* Make sure that we haven't already got this exact descriptor. */
+ if (sdmap_get(routerlist->desc_digest_map,
+ router->cache_info.signed_descriptor_digest)) {
+ /* If we have this descriptor already and the new descriptor is a bridge
+ * descriptor, replace it. If we had a bridge descriptor before and the
+ * new one is not a bridge descriptor, don't replace it. */
+
+ /* Only members of routerlist->identity_map can be bridges; we don't
+ * put bridges in old_routers. */
+ const int was_bridge = old_router &&
+ old_router->purpose == ROUTER_PURPOSE_BRIDGE;
+
+ if (routerinfo_is_a_configured_bridge(router) &&
+ router->purpose == ROUTER_PURPOSE_BRIDGE &&
+ !was_bridge) {
+ log_info(LD_DIR, "Replacing non-bridge descriptor with bridge "
+ "descriptor for router %s",
+ router_describe(router));
+ } else {
+ log_info(LD_DIR,
+ "Dropping descriptor that we already have for router %s",
+ router_describe(router));
+ *msg = "Router descriptor was not new.";
+ routerinfo_free(router);
+ return ROUTER_IS_ALREADY_KNOWN;
+ }
+ }
+
+ if (authdir) {
+ if (authdir_wants_to_reject_router(router, msg,
+ !from_cache && !from_fetch,
+ &authdir_believes_valid)) {
+ tor_assert(*msg);
+ routerinfo_free(router);
+ return ROUTER_AUTHDIR_REJECTS;
+ }
+ } else if (from_fetch) {
+ /* Only check the descriptor digest against the network statuses when
+ * we are receiving in response to a fetch. */
+
+ if (!signed_desc_digest_is_recognized(&router->cache_info) &&
+ !routerinfo_is_a_configured_bridge(router)) {
+ /* We asked for it, so some networkstatus must have listed it when we
+ * did. Save it if we're a cache in case somebody else asks for it. */
+ log_info(LD_DIR,
+ "Received a no-longer-recognized descriptor for router %s",
+ router_describe(router));
+ *msg = "Router descriptor is not referenced by any network-status.";
+
+ /* Only journal this desc if we want to keep old descriptors */
+ if (!from_cache && should_cache_old_descriptors())
+ signed_desc_append_to_journal(&router->cache_info,
+ &routerlist->desc_store);
+ routerlist_insert_old(routerlist, router);
+ return ROUTER_NOT_IN_CONSENSUS_OR_NETWORKSTATUS;
+ }
+ }
+
+ /* We no longer need a router with this descriptor digest. */
+ if (consensus) {
+ routerstatus_t *rs = networkstatus_vote_find_mutable_entry(
+ consensus, id_digest);
+ if (rs && tor_memeq(rs->descriptor_digest,
+ router->cache_info.signed_descriptor_digest,
+ DIGEST_LEN)) {
+ in_consensus = 1;
+ }
+ }
+
+ if (router->purpose == ROUTER_PURPOSE_GENERAL &&
+ consensus && !in_consensus && !authdir) {
+ /* If it's a general router not listed in the consensus, then don't
+ * consider replacing the latest router with it. */
+ if (!from_cache && should_cache_old_descriptors())
+ signed_desc_append_to_journal(&router->cache_info,
+ &routerlist->desc_store);
+ routerlist_insert_old(routerlist, router);
+ *msg = "Skipping router descriptor: not in consensus.";
+ return ROUTER_NOT_IN_CONSENSUS;
+ }
+
+ /* If we're reading a bridge descriptor from our cache, and we don't
+ * recognize it as one of our currently configured bridges, drop the
+ * descriptor. Otherwise we could end up using it as one of our entry
+ * guards even if it isn't in our Bridge config lines. */
+ if (router->purpose == ROUTER_PURPOSE_BRIDGE && from_cache &&
+ !authdir_mode_bridge(options) &&
+ !routerinfo_is_a_configured_bridge(router)) {
+ log_info(LD_DIR, "Dropping bridge descriptor for %s because we have "
+ "no bridge configured at that address.",
+ safe_str_client(router_describe(router)));
+ *msg = "Router descriptor was not a configured bridge.";
+ routerinfo_free(router);
+ return ROUTER_WAS_NOT_WANTED;
+ }
+
+ /* If we have a router with the same identity key, choose the newer one. */
+ if (old_router) {
+ if (!in_consensus && (router->cache_info.published_on <=
+ old_router->cache_info.published_on)) {
+ /* Same key, but old. This one is not listed in the consensus. */
+ log_debug(LD_DIR, "Not-new descriptor for router %s",
+ router_describe(router));
+ /* Only journal this desc if we'll be serving it. */
+ if (!from_cache && should_cache_old_descriptors())
+ signed_desc_append_to_journal(&router->cache_info,
+ &routerlist->desc_store);
+ routerlist_insert_old(routerlist, router);
+ *msg = "Router descriptor was not new.";
+ return ROUTER_IS_ALREADY_KNOWN;
+ } else {
+ /* Same key, and either new, or listed in the consensus. */
+ log_debug(LD_DIR, "Replacing entry for router %s",
+ router_describe(router));
+ routerlist_replace(routerlist, old_router, router);
+ if (!from_cache) {
+ signed_desc_append_to_journal(&router->cache_info,
+ &routerlist->desc_store);
+ }
+ *msg = authdir_believes_valid ? "Valid server updated" :
+ ("Invalid server updated. (This dirserver is marking your "
+ "server as unapproved.)");
+ return ROUTER_ADDED_SUCCESSFULLY;
+ }
+ }
+
+ if (!in_consensus && from_cache &&
+ router_descriptor_is_older_than(router, OLD_ROUTER_DESC_MAX_AGE)) {
+ *msg = "Router descriptor was really old.";
+ routerinfo_free(router);
+ return ROUTER_WAS_TOO_OLD;
+ }
+
+ /* We haven't seen a router with this identity before. Add it to the end of
+ * the list. */
+ routerlist_insert(routerlist, router);
+ if (!from_cache) {
+ signed_desc_append_to_journal(&router->cache_info,
+ &routerlist->desc_store);
+ }
+ return ROUTER_ADDED_SUCCESSFULLY;
+}
+
+/** Insert <b>ei</b> into the routerlist, or free it. Other arguments are
+ * as for router_add_to_routerlist(). Return ROUTER_ADDED_SUCCESSFULLY iff
+ * we actually inserted it, ROUTER_BAD_EI otherwise.
+ */
+was_router_added_t
+router_add_extrainfo_to_routerlist(extrainfo_t *ei, const char **msg,
+ int from_cache, int from_fetch)
+{
+ was_router_added_t inserted;
+ (void)from_fetch;
+ if (msg) *msg = NULL;
+ /*XXXX Do something with msg */
+
+ inserted = extrainfo_insert(router_get_routerlist(), ei, !from_cache);
+
+ if (WRA_WAS_ADDED(inserted) && !from_cache)
+ signed_desc_append_to_journal(&ei->cache_info,
+ &routerlist->extrainfo_store);
+
+ return inserted;
+}
+
+/** Sorting helper: return <0, 0, or >0 depending on whether the
+ * signed_descriptor_t* in *<b>a</b> has an identity digest preceding, equal
+ * to, or later than that of *<b>b</b>. */
+static int
+compare_old_routers_by_identity_(const void **_a, const void **_b)
+{
+ int i;
+ const signed_descriptor_t *r1 = *_a, *r2 = *_b;
+ if ((i = fast_memcmp(r1->identity_digest, r2->identity_digest, DIGEST_LEN)))
+ return i;
+ return (int)(r1->published_on - r2->published_on);
+}
+
+/** Internal type used to represent how long an old descriptor was valid,
+ * where it appeared in the list of old descriptors, and whether it's extra
+ * old. Used only by routerlist_remove_old_cached_routers_with_id(). */
+struct duration_idx_t {
+ int duration;
+ int idx;
+ int old;
+};
+
+/** Sorting helper: compare two duration_idx_t by their duration. */
+static int
+compare_duration_idx_(const void *_d1, const void *_d2)
+{
+ const struct duration_idx_t *d1 = _d1;
+ const struct duration_idx_t *d2 = _d2;
+ return d1->duration - d2->duration;
+}
+
+/** The range <b>lo</b> through <b>hi</b> inclusive of routerlist->old_routers
+ * must contain routerinfo_t with the same identity and with publication time
+ * in ascending order. Remove members from this range until there are no more
+ * than max_descriptors_per_router() remaining. Start by removing the oldest
+ * members from before <b>cutoff</b>, then remove members which were current
+ * for the lowest amount of time. The order of members of old_routers at
+ * indices <b>lo</b> or higher may be changed.
+ */
+static void
+routerlist_remove_old_cached_routers_with_id(time_t now,
+ time_t cutoff, int lo, int hi,
+ digestset_t *retain)
+{
+ int i, n = hi-lo+1;
+ unsigned n_extra, n_rmv = 0;
+ struct duration_idx_t *lifespans;
+ uint8_t *rmv, *must_keep;
+ smartlist_t *lst = routerlist->old_routers;
+#if 1
+ const char *ident;
+ tor_assert(hi < smartlist_len(lst));
+ tor_assert(lo <= hi);
+ ident = ((signed_descriptor_t*)smartlist_get(lst, lo))->identity_digest;
+ for (i = lo+1; i <= hi; ++i) {
+ signed_descriptor_t *r = smartlist_get(lst, i);
+ tor_assert(tor_memeq(ident, r->identity_digest, DIGEST_LEN));
+ }
+#endif /* 1 */
+ /* Check whether we need to do anything at all. */
+ {
+ int mdpr = directory_caches_dir_info(get_options()) ? 2 : 1;
+ if (n <= mdpr)
+ return;
+ n_extra = n - mdpr;
+ }
+
+ lifespans = tor_calloc(n, sizeof(struct duration_idx_t));
+ rmv = tor_calloc(n, sizeof(uint8_t));
+ must_keep = tor_calloc(n, sizeof(uint8_t));
+ /* Set lifespans to contain the lifespan and index of each server. */
+ /* Set rmv[i-lo]=1 if we're going to remove a server for being too old. */
+ for (i = lo; i <= hi; ++i) {
+ signed_descriptor_t *r = smartlist_get(lst, i);
+ signed_descriptor_t *r_next;
+ lifespans[i-lo].idx = i;
+ if (r->last_listed_as_valid_until >= now ||
+ (retain && digestset_probably_contains(retain,
+ r->signed_descriptor_digest))) {
+ must_keep[i-lo] = 1;
+ }
+ if (i < hi) {
+ r_next = smartlist_get(lst, i+1);
+ tor_assert(r->published_on <= r_next->published_on);
+ lifespans[i-lo].duration = (int)(r_next->published_on - r->published_on);
+ } else {
+ r_next = NULL;
+ lifespans[i-lo].duration = INT_MAX;
+ }
+ if (!must_keep[i-lo] && r->published_on < cutoff && n_rmv < n_extra) {
+ ++n_rmv;
+ lifespans[i-lo].old = 1;
+ rmv[i-lo] = 1;
+ }
+ }
+
+ if (n_rmv < n_extra) {
+ /**
+ * We aren't removing enough servers for being old. Sort lifespans by
+ * the duration of liveness, and remove the ones we're not already going to
+ * remove based on how long they were alive.
+ **/
+ qsort(lifespans, n, sizeof(struct duration_idx_t), compare_duration_idx_);
+ for (i = 0; i < n && n_rmv < n_extra; ++i) {
+ if (!must_keep[lifespans[i].idx-lo] && !lifespans[i].old) {
+ rmv[lifespans[i].idx-lo] = 1;
+ ++n_rmv;
+ }
+ }
+ }
+
+ i = hi;
+ do {
+ if (rmv[i-lo])
+ routerlist_remove_old(routerlist, smartlist_get(lst, i), i);
+ } while (--i >= lo);
+ tor_free(must_keep);
+ tor_free(rmv);
+ tor_free(lifespans);
+}
+
+/** Deactivate any routers from the routerlist that are more than
+ * ROUTER_MAX_AGE seconds old and not recommended by any networkstatuses;
+ * remove old routers from the list of cached routers if we have too many.
+ */
+void
+routerlist_remove_old_routers(void)
+{
+ int i, hi=-1;
+ const char *cur_id = NULL;
+ time_t now = time(NULL);
+ time_t cutoff;
+ routerinfo_t *router;
+ signed_descriptor_t *sd;
+ digestset_t *retain;
+ const networkstatus_t *consensus = networkstatus_get_latest_consensus();
+
+ trusted_dirs_remove_old_certs();
+
+ if (!routerlist || !consensus)
+ return;
+
+ // routerlist_assert_ok(routerlist);
+
+ /* We need to guess how many router descriptors we will wind up wanting to
+ retain, so that we can be sure to allocate a large enough Bloom filter
+ to hold the digest set. Overestimating is fine; underestimating is bad.
+ */
+ {
+ /* We'll probably retain everything in the consensus. */
+ int n_max_retain = smartlist_len(consensus->routerstatus_list);
+ retain = digestset_new(n_max_retain);
+ }
+
+ cutoff = now - OLD_ROUTER_DESC_MAX_AGE;
+ /* Retain anything listed in the consensus. */
+ if (consensus) {
+ SMARTLIST_FOREACH(consensus->routerstatus_list, routerstatus_t *, rs,
+ if (rs->published_on >= cutoff)
+ digestset_add(retain, rs->descriptor_digest));
+ }
+
+ /* If we have a consensus, we should consider pruning current routers that
+ * are too old and that nobody recommends. (If we don't have a consensus,
+ * then we should get one before we decide to kill routers.) */
+
+ if (consensus) {
+ cutoff = now - ROUTER_MAX_AGE;
+ /* Remove too-old unrecommended members of routerlist->routers. */
+ for (i = 0; i < smartlist_len(routerlist->routers); ++i) {
+ router = smartlist_get(routerlist->routers, i);
+ if (router->cache_info.published_on <= cutoff &&
+ router->cache_info.last_listed_as_valid_until < now &&
+ !digestset_probably_contains(retain,
+ router->cache_info.signed_descriptor_digest)) {
+ /* Too old: remove it. (If we're a cache, just move it into
+ * old_routers.) */
+ log_info(LD_DIR,
+ "Forgetting obsolete (too old) routerinfo for router %s",
+ router_describe(router));
+ routerlist_remove(routerlist, router, 1, now);
+ i--;
+ }
+ }
+ }
+
+ //routerlist_assert_ok(routerlist);
+
+ /* Remove far-too-old members of routerlist->old_routers. */
+ cutoff = now - OLD_ROUTER_DESC_MAX_AGE;
+ for (i = 0; i < smartlist_len(routerlist->old_routers); ++i) {
+ sd = smartlist_get(routerlist->old_routers, i);
+ if (sd->published_on <= cutoff &&
+ sd->last_listed_as_valid_until < now &&
+ !digestset_probably_contains(retain, sd->signed_descriptor_digest)) {
+ /* Too old. Remove it. */
+ routerlist_remove_old(routerlist, sd, i--);
+ }
+ }
+
+ //routerlist_assert_ok(routerlist);
+
+ log_info(LD_DIR, "We have %d live routers and %d old router descriptors.",
+ smartlist_len(routerlist->routers),
+ smartlist_len(routerlist->old_routers));
+
+ /* Now we might have to look at routerlist->old_routers for extraneous
+ * members. (We'd keep all the members if we could, but we need to save
+ * space.) First, check whether we have too many router descriptors, total.
+ * We're okay with having too many for some given router, so long as the
+ * total number doesn't approach max_descriptors_per_router()*len(router).
+ */
+ if (smartlist_len(routerlist->old_routers) <
+ smartlist_len(routerlist->routers))
+ goto done;
+
+ /* Sort by identity, then fix indices. */
+ smartlist_sort(routerlist->old_routers, compare_old_routers_by_identity_);
+ /* Fix indices. */
+ for (i = 0; i < smartlist_len(routerlist->old_routers); ++i) {
+ signed_descriptor_t *r = smartlist_get(routerlist->old_routers, i);
+ r->routerlist_index = i;
+ }
+
+ /* Iterate through the list from back to front, so when we remove descriptors
+ * we don't mess up groups we haven't gotten to. */
+ for (i = smartlist_len(routerlist->old_routers)-1; i >= 0; --i) {
+ signed_descriptor_t *r = smartlist_get(routerlist->old_routers, i);
+ if (!cur_id) {
+ cur_id = r->identity_digest;
+ hi = i;
+ }
+ if (tor_memneq(cur_id, r->identity_digest, DIGEST_LEN)) {
+ routerlist_remove_old_cached_routers_with_id(now,
+ cutoff, i+1, hi, retain);
+ cur_id = r->identity_digest;
+ hi = i;
+ }
+ }
+ if (hi>=0)
+ routerlist_remove_old_cached_routers_with_id(now, cutoff, 0, hi, retain);
+ //routerlist_assert_ok(routerlist);
+
+ done:
+ digestset_free(retain);
+ router_rebuild_store(RRS_DONT_REMOVE_OLD, &routerlist->desc_store);
+ router_rebuild_store(RRS_DONT_REMOVE_OLD,&routerlist->extrainfo_store);
+}
+
+/** We just added a new set of descriptors. Take whatever extra steps
+ * we need. */
+void
+routerlist_descriptors_added(smartlist_t *sl, int from_cache)
+{
+ tor_assert(sl);
+ control_event_descriptors_changed(sl);
+ SMARTLIST_FOREACH_BEGIN(sl, routerinfo_t *, ri) {
+ if (ri->purpose == ROUTER_PURPOSE_BRIDGE)
+ learned_bridge_descriptor(ri, from_cache);
+ if (ri->needs_retest_if_added) {
+ ri->needs_retest_if_added = 0;
+ dirserv_single_reachability_test(approx_time(), ri);
+ }
+ } SMARTLIST_FOREACH_END(ri);
+}
+
+/**
+ * Code to parse a single router descriptor and insert it into the
+ * routerlist. Return -1 if the descriptor was ill-formed; 0 if the
+ * descriptor was well-formed but could not be added; and 1 if the
+ * descriptor was added.
+ *
+ * If we don't add it and <b>msg</b> is not NULL, then assign to
+ * *<b>msg</b> a static string describing the reason for refusing the
+ * descriptor.
+ *
+ * This is used only by the controller.
+ */
+int
+router_load_single_router(const char *s, uint8_t purpose, int cache,
+ const char **msg)
+{
+ routerinfo_t *ri;
+ was_router_added_t r;
+ smartlist_t *lst;
+ char annotation_buf[ROUTER_ANNOTATION_BUF_LEN];
+ tor_assert(msg);
+ *msg = NULL;
+
+ tor_snprintf(annotation_buf, sizeof(annotation_buf),
+ "@source controller\n"
+ "@purpose %s\n", router_purpose_to_string(purpose));
+
+ if (!(ri = router_parse_entry_from_string(s, NULL, 1, 0,
+ annotation_buf, NULL))) {
+ log_warn(LD_DIR, "Error parsing router descriptor; dropping.");
+ *msg = "Couldn't parse router descriptor.";
+ return -1;
+ }
+ tor_assert(ri->purpose == purpose);
+ if (router_is_me(ri)) {
+ log_warn(LD_DIR, "Router's identity key matches mine; dropping.");
+ *msg = "Router's identity key matches mine.";
+ routerinfo_free(ri);
+ return 0;
+ }
+
+ if (!cache) /* obey the preference of the controller */
+ ri->cache_info.do_not_cache = 1;
+
+ lst = smartlist_new();
+ smartlist_add(lst, ri);
+ routers_update_status_from_consensus_networkstatus(lst, 0);
+
+ r = router_add_to_routerlist(ri, msg, 0, 0);
+ if (!WRA_WAS_ADDED(r)) {
+ /* we've already assigned to *msg now, and ri is already freed */
+ tor_assert(*msg);
+ if (r == ROUTER_AUTHDIR_REJECTS)
+ log_warn(LD_DIR, "Couldn't add router to list: %s Dropping.", *msg);
+ smartlist_free(lst);
+ return 0;
+ } else {
+ routerlist_descriptors_added(lst, 0);
+ smartlist_free(lst);
+ log_debug(LD_DIR, "Added router to list");
+ return 1;
+ }
+}
+
+/** Given a string <b>s</b> containing some routerdescs, parse it and put the
+ * routers into our directory. If saved_location is SAVED_NOWHERE, the routers
+ * are in response to a query to the network: cache them by adding them to
+ * the journal.
+ *
+ * Return the number of routers actually added.
+ *
+ * If <b>requested_fingerprints</b> is provided, it must contain a list of
+ * uppercased fingerprints. Do not update any router whose
+ * fingerprint is not on the list; after updating a router, remove its
+ * fingerprint from the list.
+ *
+ * If <b>descriptor_digests</b> is non-zero, then the requested_fingerprints
+ * are descriptor digests. Otherwise they are identity digests.
+ */
+int
+router_load_routers_from_string(const char *s, const char *eos,
+ saved_location_t saved_location,
+ smartlist_t *requested_fingerprints,
+ int descriptor_digests,
+ const char *prepend_annotations)
+{
+ smartlist_t *routers = smartlist_new(), *changed = smartlist_new();
+ char fp[HEX_DIGEST_LEN+1];
+ const char *msg;
+ int from_cache = (saved_location != SAVED_NOWHERE);
+ int allow_annotations = (saved_location != SAVED_NOWHERE);
+ int any_changed = 0;
+ smartlist_t *invalid_digests = smartlist_new();
+
+ router_parse_list_from_string(&s, eos, routers, saved_location, 0,
+ allow_annotations, prepend_annotations,
+ invalid_digests);
+
+ routers_update_status_from_consensus_networkstatus(routers, !from_cache);
+
+ log_info(LD_DIR, "%d elements to add", smartlist_len(routers));
+
+ SMARTLIST_FOREACH_BEGIN(routers, routerinfo_t *, ri) {
+ was_router_added_t r;
+ char d[DIGEST_LEN];
+ if (requested_fingerprints) {
+ base16_encode(fp, sizeof(fp), descriptor_digests ?
+ ri->cache_info.signed_descriptor_digest :
+ ri->cache_info.identity_digest,
+ DIGEST_LEN);
+ if (smartlist_contains_string(requested_fingerprints, fp)) {
+ smartlist_string_remove(requested_fingerprints, fp);
+ } else {
+ char *requested =
+ smartlist_join_strings(requested_fingerprints," ",0,NULL);
+ log_warn(LD_DIR,
+ "We received a router descriptor with a fingerprint (%s) "
+ "that we never requested. (We asked for: %s.) Dropping.",
+ fp, requested);
+ tor_free(requested);
+ routerinfo_free(ri);
+ continue;
+ }
+ }
+
+ memcpy(d, ri->cache_info.signed_descriptor_digest, DIGEST_LEN);
+ r = router_add_to_routerlist(ri, &msg, from_cache, !from_cache);
+ if (WRA_WAS_ADDED(r)) {
+ any_changed++;
+ smartlist_add(changed, ri);
+ routerlist_descriptors_added(changed, from_cache);
+ smartlist_clear(changed);
+ } else if (WRA_NEVER_DOWNLOADABLE(r)) {
+ download_status_t *dl_status;
+ dl_status = router_get_dl_status_by_descriptor_digest(d);
+ if (dl_status) {
+ log_info(LD_GENERAL, "Marking router %s as never downloadable",
+ hex_str(d, DIGEST_LEN));
+ download_status_mark_impossible(dl_status);
+ }
+ }
+ } SMARTLIST_FOREACH_END(ri);
+
+ SMARTLIST_FOREACH_BEGIN(invalid_digests, const uint8_t *, bad_digest) {
+ /* This digest is never going to be parseable. */
+ base16_encode(fp, sizeof(fp), (char*)bad_digest, DIGEST_LEN);
+ if (requested_fingerprints && descriptor_digests) {
+ if (! smartlist_contains_string(requested_fingerprints, fp)) {
+ /* But we didn't ask for it, so we should assume shennanegans. */
+ continue;
+ }
+ smartlist_string_remove(requested_fingerprints, fp);
+ }
+ download_status_t *dls;
+ dls = router_get_dl_status_by_descriptor_digest((char*)bad_digest);
+ if (dls) {
+ log_info(LD_GENERAL, "Marking router with descriptor %s as unparseable, "
+ "and therefore undownloadable", fp);
+ download_status_mark_impossible(dls);
+ }
+ } SMARTLIST_FOREACH_END(bad_digest);
+ SMARTLIST_FOREACH(invalid_digests, uint8_t *, d, tor_free(d));
+ smartlist_free(invalid_digests);
+
+ routerlist_assert_ok(routerlist);
+
+ if (any_changed)
+ router_rebuild_store(0, &routerlist->desc_store);
+
+ smartlist_free(routers);
+ smartlist_free(changed);
+
+ return any_changed;
+}
+
+/** Parse one or more extrainfos from <b>s</b> (ending immediately before
+ * <b>eos</b> if <b>eos</b> is present). Other arguments are as for
+ * router_load_routers_from_string(). */
+void
+router_load_extrainfo_from_string(const char *s, const char *eos,
+ saved_location_t saved_location,
+ smartlist_t *requested_fingerprints,
+ int descriptor_digests)
+{
+ smartlist_t *extrainfo_list = smartlist_new();
+ const char *msg;
+ int from_cache = (saved_location != SAVED_NOWHERE);
+ smartlist_t *invalid_digests = smartlist_new();
+
+ router_parse_list_from_string(&s, eos, extrainfo_list, saved_location, 1, 0,
+ NULL, invalid_digests);
+
+ log_info(LD_DIR, "%d elements to add", smartlist_len(extrainfo_list));
+
+ SMARTLIST_FOREACH_BEGIN(extrainfo_list, extrainfo_t *, ei) {
+ uint8_t d[DIGEST_LEN];
+ memcpy(d, ei->cache_info.signed_descriptor_digest, DIGEST_LEN);
+ was_router_added_t added =
+ router_add_extrainfo_to_routerlist(ei, &msg, from_cache, !from_cache);
+ if (WRA_WAS_ADDED(added) && requested_fingerprints) {
+ char fp[HEX_DIGEST_LEN+1];
+ base16_encode(fp, sizeof(fp), descriptor_digests ?
+ ei->cache_info.signed_descriptor_digest :
+ ei->cache_info.identity_digest,
+ DIGEST_LEN);
+ smartlist_string_remove(requested_fingerprints, fp);
+ /* We silently let relays stuff us with extrainfos we didn't ask for,
+ * so long as we would have wanted them anyway. Since we always fetch
+ * all the extrainfos we want, and we never actually act on them
+ * inside Tor, this should be harmless. */
+ } else if (WRA_NEVER_DOWNLOADABLE(added)) {
+ signed_descriptor_t *sd = router_get_by_extrainfo_digest((char*)d);
+ if (sd) {
+ log_info(LD_GENERAL, "Marking extrainfo with descriptor %s as "
+ "unparseable, and therefore undownloadable",
+ hex_str((char*)d,DIGEST_LEN));
+ download_status_mark_impossible(&sd->ei_dl_status);
+ }
+ }
+ } SMARTLIST_FOREACH_END(ei);
+
+ SMARTLIST_FOREACH_BEGIN(invalid_digests, const uint8_t *, bad_digest) {
+ /* This digest is never going to be parseable. */
+ char fp[HEX_DIGEST_LEN+1];
+ base16_encode(fp, sizeof(fp), (char*)bad_digest, DIGEST_LEN);
+ if (requested_fingerprints) {
+ if (! smartlist_contains_string(requested_fingerprints, fp)) {
+ /* But we didn't ask for it, so we should assume shennanegans. */
+ continue;
+ }
+ smartlist_string_remove(requested_fingerprints, fp);
+ }
+ signed_descriptor_t *sd =
+ router_get_by_extrainfo_digest((char*)bad_digest);
+ if (sd) {
+ log_info(LD_GENERAL, "Marking extrainfo with descriptor %s as "
+ "unparseable, and therefore undownloadable", fp);
+ download_status_mark_impossible(&sd->ei_dl_status);
+ }
+ } SMARTLIST_FOREACH_END(bad_digest);
+ SMARTLIST_FOREACH(invalid_digests, uint8_t *, d, tor_free(d));
+ smartlist_free(invalid_digests);
+
+ routerlist_assert_ok(routerlist);
+ router_rebuild_store(0, &router_get_routerlist()->extrainfo_store);
+
+ smartlist_free(extrainfo_list);
+}
+
+/** Return true iff the latest ns-flavored consensus includes a descriptor
+ * whose digest is that of <b>desc</b>. */
+static int
+signed_desc_digest_is_recognized(signed_descriptor_t *desc)
+{
+ const routerstatus_t *rs;
+ networkstatus_t *consensus = networkstatus_get_latest_consensus_by_flavor(
+ FLAV_NS);
+
+ if (consensus) {
+ rs = networkstatus_vote_find_entry(consensus, desc->identity_digest);
+ if (rs && tor_memeq(rs->descriptor_digest,
+ desc->signed_descriptor_digest, DIGEST_LEN))
+ return 1;
+ }
+ return 0;
+}
+
+/** Update downloads for router descriptors and/or microdescriptors as
+ * appropriate. */
+void
+update_all_descriptor_downloads(time_t now)
+{
+ if (should_delay_dir_fetches(get_options(), NULL))
+ return;
+ update_router_descriptor_downloads(now);
+ update_microdesc_downloads(now);
+ launch_dummy_descriptor_download_as_needed(now, get_options());
+}
+
+/** Clear all our timeouts for fetching v3 directory stuff, and then
+ * give it all a try again. */
+void
+routerlist_retry_directory_downloads(time_t now)
+{
+ (void)now;
+
+ log_debug(LD_GENERAL,
+ "In routerlist_retry_directory_downloads()");
+
+ router_reset_status_download_failures();
+ router_reset_descriptor_download_failures();
+ reschedule_directory_downloads();
+}
+
+/** Return true iff <b>router</b> does not permit exit streams.
+ */
+int
+router_exit_policy_rejects_all(const routerinfo_t *router)
+{
+ return router->policy_is_reject_star;
+}
+
+/** For every current directory connection whose purpose is <b>purpose</b>,
+ * and where the resource being downloaded begins with <b>prefix</b>, split
+ * rest of the resource into base16 fingerprints (or base64 fingerprints if
+ * purpose==DIR_PURPOSE_FETCH_MICRODESC), decode them, and set the
+ * corresponding elements of <b>result</b> to a nonzero value.
+ */
+void
+list_pending_downloads(digestmap_t *result, digest256map_t *result256,
+ int purpose, const char *prefix)
+{
+ const size_t p_len = strlen(prefix);
+ smartlist_t *tmp = smartlist_new();
+ smartlist_t *conns = get_connection_array();
+ int flags = DSR_HEX;
+ if (purpose == DIR_PURPOSE_FETCH_MICRODESC)
+ flags = DSR_DIGEST256|DSR_BASE64;
+
+ tor_assert(result || result256);
+
+ SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
+ if (conn->type == CONN_TYPE_DIR &&
+ conn->purpose == purpose &&
+ !conn->marked_for_close) {
+ const char *resource = TO_DIR_CONN(conn)->requested_resource;
+ if (!strcmpstart(resource, prefix))
+ dir_split_resource_into_fingerprints(resource + p_len,
+ tmp, NULL, flags);
+ }
+ } SMARTLIST_FOREACH_END(conn);
+
+ if (result) {
+ SMARTLIST_FOREACH(tmp, char *, d,
+ {
+ digestmap_set(result, d, (void*)1);
+ tor_free(d);
+ });
+ } else if (result256) {
+ SMARTLIST_FOREACH(tmp, uint8_t *, d,
+ {
+ digest256map_set(result256, d, (void*)1);
+ tor_free(d);
+ });
+ }
+ smartlist_free(tmp);
+}
+
+/** For every router descriptor (or extra-info document if <b>extrainfo</b> is
+ * true) we are currently downloading by descriptor digest, set result[d] to
+ * (void*)1. */
+static void
+list_pending_descriptor_downloads(digestmap_t *result, int extrainfo)
+{
+ int purpose =
+ extrainfo ? DIR_PURPOSE_FETCH_EXTRAINFO : DIR_PURPOSE_FETCH_SERVERDESC;
+ list_pending_downloads(result, NULL, purpose, "d/");
+}
+
+/** For every microdescriptor we are currently downloading by descriptor
+ * digest, set result[d] to (void*)1.
+ */
+void
+list_pending_microdesc_downloads(digest256map_t *result)
+{
+ list_pending_downloads(NULL, result, DIR_PURPOSE_FETCH_MICRODESC, "d/");
+}
+
+/** Launch downloads for all the descriptors whose digests or digests256
+ * are listed as digests[i] for lo <= i < hi. (Lo and hi may be out of
+ * range.) If <b>source</b> is given, download from <b>source</b>;
+ * otherwise, download from an appropriate random directory server.
+ */
+MOCK_IMPL(STATIC void,
+initiate_descriptor_downloads,(const routerstatus_t *source,
+ int purpose, smartlist_t *digests,
+ int lo, int hi, int pds_flags))
+{
+ char *resource, *cp;
+ int digest_len, enc_digest_len;
+ const char *sep;
+ int b64_256;
+ smartlist_t *tmp;
+
+ if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
+ /* Microdescriptors are downloaded by "-"-separated base64-encoded
+ * 256-bit digests. */
+ digest_len = DIGEST256_LEN;
+ enc_digest_len = BASE64_DIGEST256_LEN + 1;
+ sep = "-";
+ b64_256 = 1;
+ } else {
+ digest_len = DIGEST_LEN;
+ enc_digest_len = HEX_DIGEST_LEN + 1;
+ sep = "+";
+ b64_256 = 0;
+ }
+
+ if (lo < 0)
+ lo = 0;
+ if (hi > smartlist_len(digests))
+ hi = smartlist_len(digests);
+
+ if (hi-lo <= 0)
+ return;
+
+ tmp = smartlist_new();
+
+ for (; lo < hi; ++lo) {
+ cp = tor_malloc(enc_digest_len);
+ if (b64_256) {
+ digest256_to_base64(cp, smartlist_get(digests, lo));
+ } else {
+ base16_encode(cp, enc_digest_len, smartlist_get(digests, lo),
+ digest_len);
+ }
+ smartlist_add(tmp, cp);
+ }
+
+ cp = smartlist_join_strings(tmp, sep, 0, NULL);
+ tor_asprintf(&resource, "d/%s.z", cp);
+
+ SMARTLIST_FOREACH(tmp, char *, cp1, tor_free(cp1));
+ smartlist_free(tmp);
+ tor_free(cp);
+
+ if (source) {
+ /* We know which authority or directory mirror we want. */
+ directory_request_t *req = directory_request_new(purpose);
+ directory_request_set_routerstatus(req, source);
+ directory_request_set_resource(req, resource);
+ directory_initiate_request(req);
+ directory_request_free(req);
+ } else {
+ directory_get_from_dirserver(purpose, ROUTER_PURPOSE_GENERAL, resource,
+ pds_flags, DL_WANT_ANY_DIRSERVER);
+ }
+ tor_free(resource);
+}
+
+/** Return the max number of hashes to put in a URL for a given request.
+ */
+static int
+max_dl_per_request(const or_options_t *options, int purpose)
+{
+ /* Since squid does not like URLs >= 4096 bytes we limit it to 96.
+ * 4096 - strlen(http://[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535
+ * /tor/server/d/.z) == 4026
+ * 4026/41 (40 for the hash and 1 for the + that separates them) => 98
+ * So use 96 because it's a nice number.
+ *
+ * For microdescriptors, the calculation is
+ * 4096 - strlen(http://[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535
+ * /tor/micro/d/.z) == 4027
+ * 4027/44 (43 for the hash and 1 for the - that separates them) => 91
+ * So use 90 because it's a nice number.
+ */
+ int max = 96;
+ if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
+ max = 90;
+ }
+ /* If we're going to tunnel our connections, we can ask for a lot more
+ * in a request. */
+ if (directory_must_use_begindir(options)) {
+ max = 500;
+ }
+ return max;
+}
+
+/** Don't split our requests so finely that we are requesting fewer than
+ * this number per server. (Grouping more than this at once leads to
+ * diminishing returns.) */
+#define MIN_DL_PER_REQUEST 32
+/** To prevent a single screwy cache from confusing us by selective reply,
+ * try to split our requests into at least this many requests. */
+#define MIN_REQUESTS 3
+/** If we want fewer than this many descriptors, wait until we
+ * want more, or until TestingClientMaxIntervalWithoutRequest has passed. */
+#define MAX_DL_TO_DELAY 16
+
+/** Given a <b>purpose</b> (FETCH_MICRODESC or FETCH_SERVERDESC) and a list of
+ * router descriptor digests or microdescriptor digest256s in
+ * <b>downloadable</b>, decide whether to delay fetching until we have more.
+ * If we don't want to delay, launch one or more requests to the appropriate
+ * directory authorities.
+ */
+void
+launch_descriptor_downloads(int purpose,
+ smartlist_t *downloadable,
+ const routerstatus_t *source, time_t now)
+{
+ const or_options_t *options = get_options();
+ const char *descname;
+ const int fetch_microdesc = (purpose == DIR_PURPOSE_FETCH_MICRODESC);
+ int n_downloadable = smartlist_len(downloadable);
+
+ int i, n_per_request, max_dl_per_req;
+ const char *req_plural = "", *rtr_plural = "";
+ int pds_flags = PDS_RETRY_IF_NO_SERVERS;
+
+ tor_assert(fetch_microdesc || purpose == DIR_PURPOSE_FETCH_SERVERDESC);
+ descname = fetch_microdesc ? "microdesc" : "routerdesc";
+
+ if (!n_downloadable)
+ return;
+
+ if (!directory_fetches_dir_info_early(options)) {
+ if (n_downloadable >= MAX_DL_TO_DELAY) {
+ log_debug(LD_DIR,
+ "There are enough downloadable %ss to launch requests.",
+ descname);
+ } else if (! router_have_minimum_dir_info()) {
+ log_debug(LD_DIR,
+ "We are only missing %d %ss, but we'll fetch anyway, since "
+ "we don't yet have enough directory info.",
+ n_downloadable, descname);
+ } else {
+
+ /* should delay */
+ if ((last_descriptor_download_attempted +
+ options->TestingClientMaxIntervalWithoutRequest) > now)
+ return;
+
+ if (last_descriptor_download_attempted) {
+ log_info(LD_DIR,
+ "There are not many downloadable %ss, but we've "
+ "been waiting long enough (%d seconds). Downloading.",
+ descname,
+ (int)(now-last_descriptor_download_attempted));
+ } else {
+ log_info(LD_DIR,
+ "There are not many downloadable %ss, but we haven't "
+ "tried downloading descriptors recently. Downloading.",
+ descname);
+ }
+ }
+ }
+
+ if (!authdir_mode(options)) {
+ /* If we wind up going to the authorities, we want to only open one
+ * connection to each authority at a time, so that we don't overload
+ * them. We do this by setting PDS_NO_EXISTING_SERVERDESC_FETCH
+ * regardless of whether we're a cache or not.
+ *
+ * Setting this flag can make initiate_descriptor_downloads() ignore
+ * requests. We need to make sure that we do in fact call
+ * update_router_descriptor_downloads() later on, once the connections
+ * have succeeded or failed.
+ */
+ pds_flags |= fetch_microdesc ?
+ PDS_NO_EXISTING_MICRODESC_FETCH :
+ PDS_NO_EXISTING_SERVERDESC_FETCH;
+ }
+
+ n_per_request = CEIL_DIV(n_downloadable, MIN_REQUESTS);
+ max_dl_per_req = max_dl_per_request(options, purpose);
+
+ if (n_per_request > max_dl_per_req)
+ n_per_request = max_dl_per_req;
+
+ if (n_per_request < MIN_DL_PER_REQUEST) {
+ n_per_request = MIN(MIN_DL_PER_REQUEST, n_downloadable);
+ }
+
+ if (n_downloadable > n_per_request)
+ req_plural = rtr_plural = "s";
+ else if (n_downloadable > 1)
+ rtr_plural = "s";
+
+ log_info(LD_DIR,
+ "Launching %d request%s for %d %s%s, %d at a time",
+ CEIL_DIV(n_downloadable, n_per_request), req_plural,
+ n_downloadable, descname, rtr_plural, n_per_request);
+ smartlist_sort_digests(downloadable);
+ for (i=0; i < n_downloadable; i += n_per_request) {
+ initiate_descriptor_downloads(source, purpose,
+ downloadable, i, i+n_per_request,
+ pds_flags);
+ }
+ last_descriptor_download_attempted = now;
+}
+
+/** For any descriptor that we want that's currently listed in
+ * <b>consensus</b>, download it as appropriate. */
+void
+update_consensus_router_descriptor_downloads(time_t now, int is_vote,
+ networkstatus_t *consensus)
+{
+ const or_options_t *options = get_options();
+ digestmap_t *map = NULL;
+ smartlist_t *no_longer_old = smartlist_new();
+ smartlist_t *downloadable = smartlist_new();
+ routerstatus_t *source = NULL;
+ int authdir = authdir_mode(options);
+ int n_delayed=0, n_have=0, n_would_reject=0, n_wouldnt_use=0,
+ n_inprogress=0, n_in_oldrouters=0;
+
+ if (directory_too_idle_to_fetch_descriptors(options, now))
+ goto done;
+ if (!consensus)
+ goto done;
+
+ if (is_vote) {
+ /* where's it from, so we know whom to ask for descriptors */
+ dir_server_t *ds;
+ networkstatus_voter_info_t *voter = smartlist_get(consensus->voters, 0);
+ tor_assert(voter);
+ ds = trusteddirserver_get_by_v3_auth_digest(voter->identity_digest);
+ if (ds)
+ source = &(ds->fake_status);
+ else
+ log_warn(LD_DIR, "couldn't lookup source from vote?");
+ }
+
+ map = digestmap_new();
+ list_pending_descriptor_downloads(map, 0);
+ SMARTLIST_FOREACH_BEGIN(consensus->routerstatus_list, void *, rsp) {
+ routerstatus_t *rs =
+ is_vote ? &(((vote_routerstatus_t *)rsp)->status) : rsp;
+ signed_descriptor_t *sd;
+ if ((sd = router_get_by_descriptor_digest(rs->descriptor_digest))) {
+ const routerinfo_t *ri;
+ ++n_have;
+ if (!(ri = router_get_by_id_digest(rs->identity_digest)) ||
+ tor_memneq(ri->cache_info.signed_descriptor_digest,
+ sd->signed_descriptor_digest, DIGEST_LEN)) {
+ /* We have a descriptor with this digest, but either there is no
+ * entry in routerlist with the same ID (!ri), or there is one,
+ * but the identity digest differs (memneq).
+ */
+ smartlist_add(no_longer_old, sd);
+ ++n_in_oldrouters; /* We have it in old_routers. */
+ }
+ continue; /* We have it already. */
+ }
+ if (digestmap_get(map, rs->descriptor_digest)) {
+ ++n_inprogress;
+ continue; /* We have an in-progress download. */
+ }
+ if (!download_status_is_ready(&rs->dl_status, now)) {
+ ++n_delayed; /* Not ready for retry. */
+ continue;
+ }
+ if (authdir && dirserv_would_reject_router(rs)) {
+ ++n_would_reject;
+ continue; /* We would throw it out immediately. */
+ }
+ if (!we_want_to_fetch_flavor(options, consensus->flavor) &&
+ !client_would_use_router(rs, now)) {
+ ++n_wouldnt_use;
+ continue; /* We would never use it ourself. */
+ }
+ if (is_vote && source) {
+ char time_bufnew[ISO_TIME_LEN+1];
+ char time_bufold[ISO_TIME_LEN+1];
+ const routerinfo_t *oldrouter;
+ oldrouter = router_get_by_id_digest(rs->identity_digest);
+ format_iso_time(time_bufnew, rs->published_on);
+ if (oldrouter)
+ format_iso_time(time_bufold, oldrouter->cache_info.published_on);
+ log_info(LD_DIR, "Learned about %s (%s vs %s) from %s's vote (%s)",
+ routerstatus_describe(rs),
+ time_bufnew,
+ oldrouter ? time_bufold : "none",
+ source->nickname, oldrouter ? "known" : "unknown");
+ }
+ smartlist_add(downloadable, rs->descriptor_digest);
+ } SMARTLIST_FOREACH_END(rsp);
+
+ if (!authdir_mode_v3(options)
+ && smartlist_len(no_longer_old)) {
+ routerlist_t *rl = router_get_routerlist();
+ log_info(LD_DIR, "%d router descriptors listed in consensus are "
+ "currently in old_routers; making them current.",
+ smartlist_len(no_longer_old));
+ SMARTLIST_FOREACH_BEGIN(no_longer_old, signed_descriptor_t *, sd) {
+ const char *msg;
+ was_router_added_t r;
+ time_t tmp_cert_expiration_time;
+ routerinfo_t *ri = routerlist_reparse_old(rl, sd);
+ if (!ri) {
+ log_warn(LD_BUG, "Failed to re-parse a router.");
+ continue;
+ }
+ /* need to remember for below, since add_to_routerlist may free. */
+ tmp_cert_expiration_time = ri->cert_expiration_time;
+
+ r = router_add_to_routerlist(ri, &msg, 1, 0);
+ if (WRA_WAS_OUTDATED(r)) {
+ log_warn(LD_DIR, "Couldn't add re-parsed router: %s. This isn't "
+ "usually a big deal, but you should make sure that your "
+ "clock and timezone are set correctly.",
+ msg?msg:"???");
+ if (r == ROUTER_CERTS_EXPIRED) {
+ char time_cons[ISO_TIME_LEN+1];
+ char time_cert_expires[ISO_TIME_LEN+1];
+ format_iso_time(time_cons, consensus->valid_after);
+ format_iso_time(time_cert_expires, tmp_cert_expiration_time);
+ log_warn(LD_DIR, " (I'm looking at a consensus from %s; This "
+ "router's certificates began expiring at %s.)",
+ time_cons, time_cert_expires);
+ }
+ }
+ } SMARTLIST_FOREACH_END(sd);
+ routerlist_assert_ok(rl);
+ }
+
+ log_info(LD_DIR,
+ "%d router descriptors downloadable. %d delayed; %d present "
+ "(%d of those were in old_routers); %d would_reject; "
+ "%d wouldnt_use; %d in progress.",
+ smartlist_len(downloadable), n_delayed, n_have, n_in_oldrouters,
+ n_would_reject, n_wouldnt_use, n_inprogress);
+
+ launch_descriptor_downloads(DIR_PURPOSE_FETCH_SERVERDESC,
+ downloadable, source, now);
+
+ digestmap_free(map, NULL);
+ done:
+ smartlist_free(downloadable);
+ smartlist_free(no_longer_old);
+}
+
+/** How often should we launch a server/authority request to be sure of getting
+ * a guess for our IP? */
+/*XXXX+ this info should come from netinfo cells or something, or we should
+ * do this only when we aren't seeing incoming data. see bug 652. */
+#define DUMMY_DOWNLOAD_INTERVAL (20*60)
+
+/** As needed, launch a dummy router descriptor fetch to see if our
+ * address has changed. */
+static void
+launch_dummy_descriptor_download_as_needed(time_t now,
+ const or_options_t *options)
+{
+ static time_t last_dummy_download = 0;
+ /* XXXX+ we could be smarter here; see notes on bug 652. */
+ /* If we're a server that doesn't have a configured address, we rely on
+ * directory fetches to learn when our address changes. So if we haven't
+ * tried to get any routerdescs in a long time, try a dummy fetch now. */
+ if (!options->Address &&
+ server_mode(options) &&
+ last_descriptor_download_attempted + DUMMY_DOWNLOAD_INTERVAL < now &&
+ last_dummy_download + DUMMY_DOWNLOAD_INTERVAL < now) {
+ last_dummy_download = now;
+ /* XX/teor - do we want an authority here, because they are less likely
+ * to give us the wrong address? (See #17782)
+ * I'm leaving the previous behaviour intact, because I don't like
+ * the idea of some relays contacting an authority every 20 minutes. */
+ directory_get_from_dirserver(DIR_PURPOSE_FETCH_SERVERDESC,
+ ROUTER_PURPOSE_GENERAL, "authority.z",
+ PDS_RETRY_IF_NO_SERVERS,
+ DL_WANT_ANY_DIRSERVER);
+ }
+}
+
+/** Launch downloads for router status as needed. */
+void
+update_router_descriptor_downloads(time_t now)
+{
+ const or_options_t *options = get_options();
+ if (should_delay_dir_fetches(options, NULL))
+ return;
+ if (!we_fetch_router_descriptors(options))
+ return;
+
+ update_consensus_router_descriptor_downloads(now, 0,
+ networkstatus_get_reasonably_live_consensus(now, FLAV_NS));
+}
+
+/** Launch extrainfo downloads as needed. */
+void
+update_extrainfo_downloads(time_t now)
+{
+ const or_options_t *options = get_options();
+ routerlist_t *rl;
+ smartlist_t *wanted;
+ digestmap_t *pending;
+ int old_routers, i, max_dl_per_req;
+ int n_no_ei = 0, n_pending = 0, n_have = 0, n_delay = 0, n_bogus[2] = {0,0};
+ if (! options->DownloadExtraInfo)
+ return;
+ if (should_delay_dir_fetches(options, NULL))
+ return;
+ if (!router_have_minimum_dir_info())
+ return;
+
+ pending = digestmap_new();
+ list_pending_descriptor_downloads(pending, 1);
+ rl = router_get_routerlist();
+ wanted = smartlist_new();
+ for (old_routers = 0; old_routers < 2; ++old_routers) {
+ smartlist_t *lst = old_routers ? rl->old_routers : rl->routers;
+ for (i = 0; i < smartlist_len(lst); ++i) {
+ signed_descriptor_t *sd;
+ char *d;
+ if (old_routers)
+ sd = smartlist_get(lst, i);
+ else
+ sd = &((routerinfo_t*)smartlist_get(lst, i))->cache_info;
+ if (sd->is_extrainfo)
+ continue; /* This should never happen. */
+ if (old_routers && !router_get_by_id_digest(sd->identity_digest))
+ continue; /* Couldn't check the signature if we got it. */
+ if (sd->extrainfo_is_bogus)
+ continue;
+ d = sd->extra_info_digest;
+ if (tor_digest_is_zero(d)) {
+ ++n_no_ei;
+ continue;
+ }
+ if (eimap_get(rl->extra_info_map, d)) {
+ ++n_have;
+ continue;
+ }
+ if (!download_status_is_ready(&sd->ei_dl_status, now)) {
+ ++n_delay;
+ continue;
+ }
+ if (digestmap_get(pending, d)) {
+ ++n_pending;
+ continue;
+ }
+
+ const signed_descriptor_t *sd2 = router_get_by_extrainfo_digest(d);
+ if (sd2 != sd) {
+ if (sd2 != NULL) {
+ char d1[HEX_DIGEST_LEN+1], d2[HEX_DIGEST_LEN+1];
+ char d3[HEX_DIGEST_LEN+1], d4[HEX_DIGEST_LEN+1];
+ base16_encode(d1, sizeof(d1), sd->identity_digest, DIGEST_LEN);
+ base16_encode(d2, sizeof(d2), sd2->identity_digest, DIGEST_LEN);
+ base16_encode(d3, sizeof(d3), d, DIGEST_LEN);
+ base16_encode(d4, sizeof(d3), sd2->extra_info_digest, DIGEST_LEN);
+
+ log_info(LD_DIR, "Found an entry in %s with mismatched "
+ "router_get_by_extrainfo_digest() value. This has ID %s "
+ "but the entry in the map has ID %s. This has EI digest "
+ "%s and the entry in the map has EI digest %s.",
+ old_routers?"old_routers":"routers",
+ d1, d2, d3, d4);
+ } else {
+ char d1[HEX_DIGEST_LEN+1], d2[HEX_DIGEST_LEN+1];
+ base16_encode(d1, sizeof(d1), sd->identity_digest, DIGEST_LEN);
+ base16_encode(d2, sizeof(d2), d, DIGEST_LEN);
+
+ log_info(LD_DIR, "Found an entry in %s with NULL "
+ "router_get_by_extrainfo_digest() value. This has ID %s "
+ "and EI digest %s.",
+ old_routers?"old_routers":"routers",
+ d1, d2);
+ }
+ ++n_bogus[old_routers];
+ continue;
+ }
+ smartlist_add(wanted, d);
+ }
+ }
+ digestmap_free(pending, NULL);
+
+ log_info(LD_DIR, "Extrainfo download status: %d router with no ei, %d "
+ "with present ei, %d delaying, %d pending, %d downloadable, %d "
+ "bogus in routers, %d bogus in old_routers",
+ n_no_ei, n_have, n_delay, n_pending, smartlist_len(wanted),
+ n_bogus[0], n_bogus[1]);
+
+ smartlist_shuffle(wanted);
+
+ max_dl_per_req = max_dl_per_request(options, DIR_PURPOSE_FETCH_EXTRAINFO);
+ for (i = 0; i < smartlist_len(wanted); i += max_dl_per_req) {
+ initiate_descriptor_downloads(NULL, DIR_PURPOSE_FETCH_EXTRAINFO,
+ wanted, i, i+max_dl_per_req,
+ PDS_RETRY_IF_NO_SERVERS|PDS_NO_EXISTING_SERVERDESC_FETCH);
+ }
+
+ smartlist_free(wanted);
+}
+
+/** Reset the consensus and extra-info download failure count on all routers.
+ * When we get a new consensus,
+ * routers_update_status_from_consensus_networkstatus() will reset the
+ * download statuses on the descriptors in that consensus.
+ */
+void
+router_reset_descriptor_download_failures(void)
+{
+ log_debug(LD_GENERAL,
+ "In router_reset_descriptor_download_failures()");
+
+ networkstatus_reset_download_failures();
+ last_descriptor_download_attempted = 0;
+ if (!routerlist)
+ return;
+ /* We want to download *all* extra-info descriptors, not just those in
+ * the consensus we currently have (or are about to have) */
+ SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, ri,
+ {
+ download_status_reset(&ri->cache_info.ei_dl_status);
+ });
+ SMARTLIST_FOREACH(routerlist->old_routers, signed_descriptor_t *, sd,
+ {
+ download_status_reset(&sd->ei_dl_status);
+ });
+}
+
+/** Any changes in a router descriptor's publication time larger than this are
+ * automatically non-cosmetic. */
+#define ROUTER_MAX_COSMETIC_TIME_DIFFERENCE (2*60*60)
+
+/** We allow uptime to vary from how much it ought to be by this much. */
+#define ROUTER_ALLOW_UPTIME_DRIFT (6*60*60)
+
+/** Return true iff the only differences between r1 and r2 are such that
+ * would not cause a recent (post 0.1.1.6) dirserver to republish.
+ */
+int
+router_differences_are_cosmetic(const routerinfo_t *r1, const routerinfo_t *r2)
+{
+ time_t r1pub, r2pub;
- long time_difference;
++ time_t time_difference;
+ tor_assert(r1 && r2);
+
+ /* r1 should be the one that was published first. */
+ if (r1->cache_info.published_on > r2->cache_info.published_on) {
+ const routerinfo_t *ri_tmp = r2;
+ r2 = r1;
+ r1 = ri_tmp;
+ }
+
+ /* If any key fields differ, they're different. */
+ if (r1->addr != r2->addr ||
+ strcasecmp(r1->nickname, r2->nickname) ||
+ r1->or_port != r2->or_port ||
+ !tor_addr_eq(&r1->ipv6_addr, &r2->ipv6_addr) ||
+ r1->ipv6_orport != r2->ipv6_orport ||
+ r1->dir_port != r2->dir_port ||
+ r1->purpose != r2->purpose ||
+ r1->onion_pkey_len != r2->onion_pkey_len ||
+ !tor_memeq(r1->onion_pkey, r2->onion_pkey, r1->onion_pkey_len) ||
+ !crypto_pk_eq_keys(r1->identity_pkey, r2->identity_pkey) ||
+ strcasecmp(r1->platform, r2->platform) ||
+ (r1->contact_info && !r2->contact_info) || /* contact_info is optional */
+ (!r1->contact_info && r2->contact_info) ||
+ (r1->contact_info && r2->contact_info &&
+ strcasecmp(r1->contact_info, r2->contact_info)) ||
+ r1->is_hibernating != r2->is_hibernating ||
+ ! addr_policies_eq(r1->exit_policy, r2->exit_policy) ||
+ (r1->supports_tunnelled_dir_requests !=
+ r2->supports_tunnelled_dir_requests))
+ return 0;
+ if ((r1->declared_family == NULL) != (r2->declared_family == NULL))
+ return 0;
+ if (r1->declared_family && r2->declared_family) {
+ int i, n;
+ if (smartlist_len(r1->declared_family)!=smartlist_len(r2->declared_family))
+ return 0;
+ n = smartlist_len(r1->declared_family);
+ for (i=0; i < n; ++i) {
+ if (strcasecmp(smartlist_get(r1->declared_family, i),
+ smartlist_get(r2->declared_family, i)))
+ return 0;
+ }
+ }
+
+ /* Did bandwidth change a lot? */
+ if ((r1->bandwidthcapacity < r2->bandwidthcapacity/2) ||
+ (r2->bandwidthcapacity < r1->bandwidthcapacity/2))
+ return 0;
+
+ /* Did the bandwidthrate or bandwidthburst change? */
+ if ((r1->bandwidthrate != r2->bandwidthrate) ||
+ (r1->bandwidthburst != r2->bandwidthburst))
+ return 0;
+
+ /* Did more than 12 hours pass? */
+ if (r1->cache_info.published_on + ROUTER_MAX_COSMETIC_TIME_DIFFERENCE
+ < r2->cache_info.published_on)
+ return 0;
+
+ /* Did uptime fail to increase by approximately the amount we would think,
+ * give or take some slop? */
+ r1pub = r1->cache_info.published_on;
+ r2pub = r2->cache_info.published_on;
- time_difference = labs(r2->uptime - (r1->uptime + (r2pub - r1pub)));
++ time_difference = r2->uptime - (r1->uptime + (r2pub - r1pub));
++ if (time_difference < 0)
++ time_difference = - time_difference;
+ if (time_difference > ROUTER_ALLOW_UPTIME_DRIFT &&
+ time_difference > r1->uptime * .05 &&
+ time_difference > r2->uptime * .05)
+ return 0;
+
+ /* Otherwise, the difference is cosmetic. */
+ return 1;
+}
+
+/** Check whether <b>sd</b> describes a router descriptor compatible with the
+ * extrainfo document <b>ei</b>.
+ *
+ * <b>identity_pkey</b> (which must also be provided) is RSA1024 identity key
+ * for the router. We use it to check the signature of the extrainfo document,
+ * if it has not already been checked.
+ *
+ * If no router is compatible with <b>ei</b>, <b>ei</b> should be
+ * dropped. Return 0 for "compatible", return 1 for "reject, and inform
+ * whoever uploaded <b>ei</b>, and return -1 for "reject silently.". If
+ * <b>msg</b> is present, set *<b>msg</b> to a description of the
+ * incompatibility (if any).
+ *
+ * Set the extrainfo_is_bogus field in <b>sd</b> if the digests matched
+ * but the extrainfo was nonetheless incompatible.
+ **/
+int
+routerinfo_incompatible_with_extrainfo(const crypto_pk_t *identity_pkey,
+ extrainfo_t *ei,
+ signed_descriptor_t *sd,
+ const char **msg)
+{
+ int digest_matches, digest256_matches, r=1;
+ tor_assert(identity_pkey);
+ tor_assert(sd);
+ tor_assert(ei);
+
+ if (ei->bad_sig) {
+ if (msg) *msg = "Extrainfo signature was bad, or signed with wrong key.";
+ return 1;
+ }
+
+ digest_matches = tor_memeq(ei->cache_info.signed_descriptor_digest,
+ sd->extra_info_digest, DIGEST_LEN);
+ /* Set digest256_matches to 1 if the digest is correct, or if no
+ * digest256 was in the ri. */
+ digest256_matches = tor_memeq(ei->digest256,
+ sd->extra_info_digest256, DIGEST256_LEN);
+ digest256_matches |=
+ tor_mem_is_zero(sd->extra_info_digest256, DIGEST256_LEN);
+
+ /* The identity must match exactly to have been generated at the same time
+ * by the same router. */
+ if (tor_memneq(sd->identity_digest,
+ ei->cache_info.identity_digest,
+ DIGEST_LEN)) {
+ if (msg) *msg = "Extrainfo nickname or identity did not match routerinfo";
+ goto err; /* different servers */
+ }
+
+ if (! tor_cert_opt_eq(sd->signing_key_cert,
+ ei->cache_info.signing_key_cert)) {
+ if (msg) *msg = "Extrainfo signing key cert didn't match routerinfo";
+ goto err; /* different servers */
+ }
+
+ if (ei->pending_sig) {
+ char signed_digest[128];
+ if (crypto_pk_public_checksig(identity_pkey,
+ signed_digest, sizeof(signed_digest),
+ ei->pending_sig, ei->pending_sig_len) != DIGEST_LEN ||
+ tor_memneq(signed_digest, ei->cache_info.signed_descriptor_digest,
+ DIGEST_LEN)) {
+ ei->bad_sig = 1;
+ tor_free(ei->pending_sig);
+ if (msg) *msg = "Extrainfo signature bad, or signed with wrong key";
+ goto err; /* Bad signature, or no match. */
+ }
+
+ ei->cache_info.send_unencrypted = sd->send_unencrypted;
+ tor_free(ei->pending_sig);
+ }
+
+ if (ei->cache_info.published_on < sd->published_on) {
+ if (msg) *msg = "Extrainfo published time did not match routerdesc";
+ goto err;
+ } else if (ei->cache_info.published_on > sd->published_on) {
+ if (msg) *msg = "Extrainfo published time did not match routerdesc";
+ r = -1;
+ goto err;
+ }
+
+ if (!digest256_matches && !digest_matches) {
+ if (msg) *msg = "Neither digest256 or digest matched "
+ "digest from routerdesc";
+ goto err;
+ }
+
+ if (!digest256_matches) {
+ if (msg) *msg = "Extrainfo digest did not match digest256 from routerdesc";
+ goto err; /* Digest doesn't match declared value. */
+ }
+
+ if (!digest_matches) {
+ if (msg) *msg = "Extrainfo digest did not match value from routerdesc";
+ goto err; /* Digest doesn't match declared value. */
+ }
+
+ return 0;
+ err:
+ if (digest_matches) {
+ /* This signature was okay, and the digest was right: This is indeed the
+ * corresponding extrainfo. But insanely, it doesn't match the routerinfo
+ * that lists it. Don't try to fetch this one again. */
+ sd->extrainfo_is_bogus = 1;
+ }
+
+ return r;
+}
+
+/* Does ri have a valid ntor onion key?
+ * Valid ntor onion keys exist and have at least one non-zero byte. */
+int
+routerinfo_has_curve25519_onion_key(const routerinfo_t *ri)
+{
+ if (!ri) {
+ return 0;
+ }
+
+ if (!ri->onion_curve25519_pkey) {
+ return 0;
+ }
+
+ if (tor_mem_is_zero((const char*)ri->onion_curve25519_pkey->public_key,
+ CURVE25519_PUBKEY_LEN)) {
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Is rs running a tor version known to support EXTEND2 cells?
+ * If allow_unknown_versions is true, return true if we can't tell
+ * (from a versions line or a protocols line) whether it supports extend2
+ * cells.
+ * Otherwise, return false if the version is unknown. */
+int
+routerstatus_version_supports_extend2_cells(const routerstatus_t *rs,
+ int allow_unknown_versions)
+{
+ if (!rs) {
+ return allow_unknown_versions;
+ }
+
+ if (!rs->pv.protocols_known) {
+ return allow_unknown_versions;
+ }
+
+ return rs->pv.supports_extend2_cells;
+}
+
+/** Assert that the internal representation of <b>rl</b> is
+ * self-consistent. */
+void
+routerlist_assert_ok(const routerlist_t *rl)
+{
+ routerinfo_t *r2;
+ signed_descriptor_t *sd2;
+ if (!rl)
+ return;
+ SMARTLIST_FOREACH_BEGIN(rl->routers, routerinfo_t *, r) {
+ r2 = rimap_get(rl->identity_map, r->cache_info.identity_digest);
+ tor_assert(r == r2);
+ sd2 = sdmap_get(rl->desc_digest_map,
+ r->cache_info.signed_descriptor_digest);
+ tor_assert(&(r->cache_info) == sd2);
+ tor_assert(r->cache_info.routerlist_index == r_sl_idx);
+ /* XXXX
+ *
+ * Hoo boy. We need to fix this one, and the fix is a bit tricky, so
+ * commenting this out is just a band-aid.
+ *
+ * The problem is that, although well-behaved router descriptors
+ * should never have the same value for their extra_info_digest, it's
+ * possible for ill-behaved routers to claim whatever they like there.
+ *
+ * The real answer is to trash desc_by_eid_map and instead have
+ * something that indicates for a given extra-info digest we want,
+ * what its download status is. We'll do that as a part of routerlist
+ * refactoring once consensus directories are in. For now,
+ * this rep violation is probably harmless: an adversary can make us
+ * reset our retry count for an extrainfo, but that's not the end
+ * of the world. Changing the representation in 0.2.0.x would just
+ * destabilize the codebase.
+ if (!tor_digest_is_zero(r->cache_info.extra_info_digest)) {
+ signed_descriptor_t *sd3 =
+ sdmap_get(rl->desc_by_eid_map, r->cache_info.extra_info_digest);
+ tor_assert(sd3 == &(r->cache_info));
+ }
+ */
+ } SMARTLIST_FOREACH_END(r);
+ SMARTLIST_FOREACH_BEGIN(rl->old_routers, signed_descriptor_t *, sd) {
+ r2 = rimap_get(rl->identity_map, sd->identity_digest);
+ tor_assert(!r2 || sd != &(r2->cache_info));
+ sd2 = sdmap_get(rl->desc_digest_map, sd->signed_descriptor_digest);
+ tor_assert(sd == sd2);
+ tor_assert(sd->routerlist_index == sd_sl_idx);
+ /* XXXX see above.
+ if (!tor_digest_is_zero(sd->extra_info_digest)) {
+ signed_descriptor_t *sd3 =
+ sdmap_get(rl->desc_by_eid_map, sd->extra_info_digest);
+ tor_assert(sd3 == sd);
+ }
+ */
+ } SMARTLIST_FOREACH_END(sd);
+
+ RIMAP_FOREACH(rl->identity_map, d, r) {
+ tor_assert(tor_memeq(r->cache_info.identity_digest, d, DIGEST_LEN));
+ } DIGESTMAP_FOREACH_END;
+ SDMAP_FOREACH(rl->desc_digest_map, d, sd) {
+ tor_assert(tor_memeq(sd->signed_descriptor_digest, d, DIGEST_LEN));
+ } DIGESTMAP_FOREACH_END;
+ SDMAP_FOREACH(rl->desc_by_eid_map, d, sd) {
+ tor_assert(!tor_digest_is_zero(d));
+ tor_assert(sd);
+ tor_assert(tor_memeq(sd->extra_info_digest, d, DIGEST_LEN));
+ } DIGESTMAP_FOREACH_END;
+ EIMAP_FOREACH(rl->extra_info_map, d, ei) {
+ signed_descriptor_t *sd;
+ tor_assert(tor_memeq(ei->cache_info.signed_descriptor_digest,
+ d, DIGEST_LEN));
+ sd = sdmap_get(rl->desc_by_eid_map,
+ ei->cache_info.signed_descriptor_digest);
+ // tor_assert(sd); // XXXX see above
+ if (sd) {
+ tor_assert(tor_memeq(ei->cache_info.signed_descriptor_digest,
+ sd->extra_info_digest, DIGEST_LEN));
+ }
+ } DIGESTMAP_FOREACH_END;
+}
+
+/** Allocate and return a new string representing the contact info
+ * and platform string for <b>router</b>,
+ * surrounded by quotes and using standard C escapes.
+ *
+ * THIS FUNCTION IS NOT REENTRANT. Don't call it from outside the main
+ * thread. Also, each call invalidates the last-returned value, so don't
+ * try log_warn(LD_GENERAL, "%s %s", esc_router_info(a), esc_router_info(b));
+ *
+ * If <b>router</b> is NULL, it just frees its internal memory and returns.
+ */
+const char *
+esc_router_info(const routerinfo_t *router)
+{
+ static char *info=NULL;
+ char *esc_contact, *esc_platform;
+ tor_free(info);
+
+ if (!router)
+ return NULL; /* we're exiting; just free the memory we use */
+
+ esc_contact = esc_for_log(router->contact_info);
+ esc_platform = esc_for_log(router->platform);
+
+ tor_asprintf(&info, "Contact %s, Platform %s", esc_contact, esc_platform);
+ tor_free(esc_contact);
+ tor_free(esc_platform);
+
+ return info;
+}
+
+/** Helper for sorting: compare two routerinfos by their identity
+ * digest. */
+static int
+compare_routerinfo_by_id_digest_(const void **a, const void **b)
+{
+ routerinfo_t *first = *(routerinfo_t **)a, *second = *(routerinfo_t **)b;
+ return fast_memcmp(first->cache_info.identity_digest,
+ second->cache_info.identity_digest,
+ DIGEST_LEN);
+}
+
+/** Sort a list of routerinfo_t in ascending order of identity digest. */
+void
+routers_sort_by_identity(smartlist_t *routers)
+{
+ smartlist_sort(routers, compare_routerinfo_by_id_digest_);
+}
+
+/** Called when we change a node set, or when we reload the geoip IPv4 list:
+ * recompute all country info in all configuration node sets and in the
+ * routerlist. */
+void
+refresh_all_country_info(void)
+{
+ const or_options_t *options = get_options();
+
+ if (options->EntryNodes)
+ routerset_refresh_countries(options->EntryNodes);
+ if (options->ExitNodes)
+ routerset_refresh_countries(options->ExitNodes);
+ if (options->ExcludeNodes)
+ routerset_refresh_countries(options->ExcludeNodes);
+ if (options->ExcludeExitNodes)
+ routerset_refresh_countries(options->ExcludeExitNodes);
+ if (options->ExcludeExitNodesUnion_)
+ routerset_refresh_countries(options->ExcludeExitNodesUnion_);
+
+ nodelist_refresh_countries();
+}
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