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- /* Copyright (c) 2001 Matej Pfajfar.
- * Copyright (c) 2001-2004, Roger Dingledine.
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
- * Copyright (c) 2007-2012, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- /**
- * \file entrynodes.c
- * \brief Code to manage our fixed first nodes for various functions.
- *
- * Entry nodes can be guards (for general use) or bridges (for censorship
- * circumvention).
- **/
- #include "or.h"
- #include "circuitbuild.h"
- #include "circuitstats.h"
- #include "config.h"
- #include "confparse.h"
- #include "connection.h"
- #include "connection_or.h"
- #include "control.h"
- #include "directory.h"
- #include "entrynodes.h"
- #include "main.h"
- #include "nodelist.h"
- #include "policies.h"
- #include "router.h"
- #include "routerlist.h"
- #include "routerparse.h"
- #include "routerset.h"
- #include "transports.h"
- #include "statefile.h"
- /** Information about a configured bridge. Currently this just matches the
- * ones in the torrc file, but one day we may be able to learn about new
- * bridges on our own, and remember them in the state file. */
- typedef struct {
- /** Address of the bridge. */
- tor_addr_t addr;
- /** TLS port for the bridge. */
- uint16_t port;
- /** Boolean: We are re-parsing our bridge list, and we are going to remove
- * this one if we don't find it in the list of configured bridges. */
- unsigned marked_for_removal : 1;
- /** Expected identity digest, or all zero bytes if we don't know what the
- * digest should be. */
- char identity[DIGEST_LEN];
- /** Name of pluggable transport protocol taken from its config line. */
- char *transport_name;
- /** When should we next try to fetch a descriptor for this bridge? */
- download_status_t fetch_status;
- } bridge_info_t;
- /** A list of our chosen entry guards. */
- static smartlist_t *entry_guards = NULL;
- /** A value of 1 means that the entry_guards list has changed
- * and those changes need to be flushed to disk. */
- static int entry_guards_dirty = 0;
- static void bridge_free(bridge_info_t *bridge);
- /** Return the list of entry guards, creating it if necessary. */
- const smartlist_t *
- get_entry_guards(void)
- {
- if (! entry_guards)
- entry_guards = smartlist_new();
- return entry_guards;
- }
- /** Check whether the entry guard <b>e</b> is usable, given the directory
- * authorities' opinion about the router (stored in <b>ri</b>) and the user's
- * configuration (in <b>options</b>). Set <b>e</b>->bad_since
- * accordingly. Return true iff the entry guard's status changes.
- *
- * If it's not usable, set *<b>reason</b> to a static string explaining why.
- */
- static int
- entry_guard_set_status(entry_guard_t *e, const node_t *node,
- time_t now, const or_options_t *options,
- const char **reason)
- {
- char buf[HEX_DIGEST_LEN+1];
- int changed = 0;
- *reason = NULL;
- /* Do we want to mark this guard as bad? */
- if (!node)
- *reason = "unlisted";
- else if (!node->is_running)
- *reason = "down";
- else if (options->UseBridges && (!node->ri ||
- node->ri->purpose != ROUTER_PURPOSE_BRIDGE))
- *reason = "not a bridge";
- else if (options->UseBridges && !node_is_a_configured_bridge(node))
- *reason = "not a configured bridge";
- else if (!options->UseBridges && !node->is_possible_guard &&
- !routerset_contains_node(options->EntryNodes,node))
- *reason = "not recommended as a guard";
- else if (routerset_contains_node(options->ExcludeNodes, node))
- *reason = "excluded";
- else if (e->path_bias_disabled)
- *reason = "path-biased";
- if (*reason && ! e->bad_since) {
- /* Router is newly bad. */
- base16_encode(buf, sizeof(buf), e->identity, DIGEST_LEN);
- log_info(LD_CIRC, "Entry guard %s (%s) is %s: marking as unusable.",
- e->nickname, buf, *reason);
- e->bad_since = now;
- control_event_guard(e->nickname, e->identity, "BAD");
- changed = 1;
- } else if (!*reason && e->bad_since) {
- /* There's nothing wrong with the router any more. */
- base16_encode(buf, sizeof(buf), e->identity, DIGEST_LEN);
- log_info(LD_CIRC, "Entry guard %s (%s) is no longer unusable: "
- "marking as ok.", e->nickname, buf);
- e->bad_since = 0;
- control_event_guard(e->nickname, e->identity, "GOOD");
- changed = 1;
- }
- return changed;
- }
- /** Return true iff enough time has passed since we last tried to connect
- * to the unreachable guard <b>e</b> that we're willing to try again. */
- static int
- entry_is_time_to_retry(entry_guard_t *e, time_t now)
- {
- long diff;
- if (e->last_attempted < e->unreachable_since)
- return 1;
- diff = now - e->unreachable_since;
- if (diff < 6*60*60)
- return now > (e->last_attempted + 60*60);
- else if (diff < 3*24*60*60)
- return now > (e->last_attempted + 4*60*60);
- else if (diff < 7*24*60*60)
- return now > (e->last_attempted + 18*60*60);
- else
- return now > (e->last_attempted + 36*60*60);
- }
- /** Return the node corresponding to <b>e</b>, if <b>e</b> is
- * working well enough that we are willing to use it as an entry
- * right now. (Else return NULL.) In particular, it must be
- * - Listed as either up or never yet contacted;
- * - Present in the routerlist;
- * - Listed as 'stable' or 'fast' by the current dirserver consensus,
- * if demanded by <b>need_uptime</b> or <b>need_capacity</b>
- * (unless it's a configured EntryNode);
- * - Allowed by our current ReachableORAddresses config option; and
- * - Currently thought to be reachable by us (unless <b>assume_reachable</b>
- * is true).
- *
- * If the answer is no, set *<b>msg</b> to an explanation of why.
- */
- static INLINE const node_t *
- entry_is_live(entry_guard_t *e, int need_uptime, int need_capacity,
- int assume_reachable, const char **msg)
- {
- const node_t *node;
- const or_options_t *options = get_options();
- tor_assert(msg);
- if (e->path_bias_disabled) {
- *msg = "path-biased";
- return NULL;
- }
- if (e->bad_since) {
- *msg = "bad";
- return NULL;
- }
- /* no good if it's unreachable, unless assume_unreachable or can_retry. */
- if (!assume_reachable && !e->can_retry &&
- e->unreachable_since && !entry_is_time_to_retry(e, time(NULL))) {
- *msg = "unreachable";
- return NULL;
- }
- node = node_get_by_id(e->identity);
- if (!node || !node_has_descriptor(node)) {
- *msg = "no descriptor";
- return NULL;
- }
- if (get_options()->UseBridges) {
- if (node_get_purpose(node) != ROUTER_PURPOSE_BRIDGE) {
- *msg = "not a bridge";
- return NULL;
- }
- if (!node_is_a_configured_bridge(node)) {
- *msg = "not a configured bridge";
- return NULL;
- }
- } else { /* !get_options()->UseBridges */
- if (node_get_purpose(node) != ROUTER_PURPOSE_GENERAL) {
- *msg = "not general-purpose";
- return NULL;
- }
- }
- if (routerset_contains_node(options->EntryNodes, node)) {
- /* they asked for it, they get it */
- need_uptime = need_capacity = 0;
- }
- if (node_is_unreliable(node, need_uptime, need_capacity, 0)) {
- *msg = "not fast/stable";
- return NULL;
- }
- if (!fascist_firewall_allows_node(node)) {
- *msg = "unreachable by config";
- return NULL;
- }
- return node;
- }
- /** Return the number of entry guards that we think are usable. */
- static int
- num_live_entry_guards(void)
- {
- int n = 0;
- const char *msg;
- if (! entry_guards)
- return 0;
- SMARTLIST_FOREACH(entry_guards, entry_guard_t *, entry,
- {
- if (entry_is_live(entry, 0, 1, 0, &msg))
- ++n;
- });
- return n;
- }
- /** If <b>digest</b> matches the identity of any node in the
- * entry_guards list, return that node. Else return NULL. */
- entry_guard_t *
- entry_guard_get_by_id_digest(const char *digest)
- {
- SMARTLIST_FOREACH(entry_guards, entry_guard_t *, entry,
- if (tor_memeq(digest, entry->identity, DIGEST_LEN))
- return entry;
- );
- return NULL;
- }
- /** Dump a description of our list of entry guards to the log at level
- * <b>severity</b>. */
- static void
- log_entry_guards(int severity)
- {
- smartlist_t *elements = smartlist_new();
- char *s;
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, e)
- {
- const char *msg = NULL;
- if (entry_is_live(e, 0, 1, 0, &msg))
- smartlist_add_asprintf(elements, "%s [%s] (up %s)",
- e->nickname,
- hex_str(e->identity, DIGEST_LEN),
- e->made_contact ? "made-contact" : "never-contacted");
- else
- smartlist_add_asprintf(elements, "%s [%s] (%s, %s)",
- e->nickname,
- hex_str(e->identity, DIGEST_LEN),
- msg,
- e->made_contact ? "made-contact" : "never-contacted");
- }
- SMARTLIST_FOREACH_END(e);
- s = smartlist_join_strings(elements, ",", 0, NULL);
- SMARTLIST_FOREACH(elements, char*, cp, tor_free(cp));
- smartlist_free(elements);
- log_fn(severity,LD_CIRC,"%s",s);
- tor_free(s);
- }
- /** Called when one or more guards that we would previously have used for some
- * purpose are no longer in use because a higher-priority guard has become
- * usable again. */
- static void
- control_event_guard_deferred(void)
- {
- /* XXXX We don't actually have a good way to figure out _how many_ entries
- * are live for some purpose. We need an entry_is_even_slightly_live()
- * function for this to work right. NumEntryGuards isn't reliable: if we
- * need guards with weird properties, we can have more than that number
- * live.
- **/
- #if 0
- int n = 0;
- const char *msg;
- const or_options_t *options = get_options();
- if (!entry_guards)
- return;
- SMARTLIST_FOREACH(entry_guards, entry_guard_t *, entry,
- {
- if (entry_is_live(entry, 0, 1, 0, &msg)) {
- if (n++ == options->NumEntryGuards) {
- control_event_guard(entry->nickname, entry->identity, "DEFERRED");
- return;
- }
- }
- });
- #endif
- }
- /** Add a new (preferably stable and fast) router to our
- * entry_guards list. Return a pointer to the router if we succeed,
- * or NULL if we can't find any more suitable entries.
- *
- * If <b>chosen</b> is defined, use that one, and if it's not
- * already in our entry_guards list, put it at the *beginning*.
- * Else, put the one we pick at the end of the list. */
- static const node_t *
- add_an_entry_guard(const node_t *chosen, int reset_status, int prepend)
- {
- const node_t *node;
- entry_guard_t *entry;
- if (chosen) {
- node = chosen;
- entry = entry_guard_get_by_id_digest(node->identity);
- if (entry) {
- if (reset_status) {
- entry->bad_since = 0;
- entry->can_retry = 1;
- }
- return NULL;
- }
- } else {
- node = choose_good_entry_server(CIRCUIT_PURPOSE_C_GENERAL, NULL);
- if (!node)
- return NULL;
- }
- entry = tor_malloc_zero(sizeof(entry_guard_t));
- log_info(LD_CIRC, "Chose %s as new entry guard.",
- node_describe(node));
- strlcpy(entry->nickname, node_get_nickname(node), sizeof(entry->nickname));
- memcpy(entry->identity, node->identity, DIGEST_LEN);
- /* Choose expiry time smudged over the past month. The goal here
- * is to a) spread out when Tor clients rotate their guards, so they
- * don't all select them on the same day, and b) avoid leaving a
- * precise timestamp in the state file about when we first picked
- * this guard. For details, see the Jan 2010 or-dev thread. */
- entry->chosen_on_date = time(NULL) - crypto_rand_int(3600*24*30);
- entry->chosen_by_version = tor_strdup(VERSION);
- if (prepend)
- smartlist_insert(entry_guards, 0, entry);
- else
- smartlist_add(entry_guards, entry);
- control_event_guard(entry->nickname, entry->identity, "NEW");
- control_event_guard_deferred();
- log_entry_guards(LOG_INFO);
- return node;
- }
- /** If the use of entry guards is configured, choose more entry guards
- * until we have enough in the list. */
- static void
- pick_entry_guards(const or_options_t *options)
- {
- int changed = 0;
- tor_assert(entry_guards);
- while (num_live_entry_guards() < options->NumEntryGuards) {
- if (!add_an_entry_guard(NULL, 0, 0))
- break;
- changed = 1;
- }
- if (changed)
- entry_guards_changed();
- }
- /** How long (in seconds) do we allow an entry guard to be nonfunctional,
- * unlisted, excluded, or otherwise nonusable before we give up on it? */
- #define ENTRY_GUARD_REMOVE_AFTER (30*24*60*60)
- /** Release all storage held by <b>e</b>. */
- static void
- entry_guard_free(entry_guard_t *e)
- {
- if (!e)
- return;
- tor_free(e->chosen_by_version);
- tor_free(e);
- }
- /** Remove any entry guard which was selected by an unknown version of Tor,
- * or which was selected by a version of Tor that's known to select
- * entry guards badly, or which was selected more 2 months ago. */
- /* XXXX The "obsolete guards" and "chosen long ago guards" things should
- * probably be different functions. */
- static int
- remove_obsolete_entry_guards(time_t now)
- {
- int changed = 0, i;
- for (i = 0; i < smartlist_len(entry_guards); ++i) {
- entry_guard_t *entry = smartlist_get(entry_guards, i);
- const char *ver = entry->chosen_by_version;
- const char *msg = NULL;
- tor_version_t v;
- int version_is_bad = 0, date_is_bad = 0;
- if (!ver) {
- msg = "does not say what version of Tor it was selected by";
- version_is_bad = 1;
- } else if (tor_version_parse(ver, &v)) {
- msg = "does not seem to be from any recognized version of Tor";
- version_is_bad = 1;
- } else {
- char *tor_ver = NULL;
- tor_asprintf(&tor_ver, "Tor %s", ver);
- if ((tor_version_as_new_as(tor_ver, "0.1.0.10-alpha") &&
- !tor_version_as_new_as(tor_ver, "0.1.2.16-dev")) ||
- (tor_version_as_new_as(tor_ver, "0.2.0.0-alpha") &&
- !tor_version_as_new_as(tor_ver, "0.2.0.6-alpha")) ||
- /* above are bug 440; below are bug 1217 */
- (tor_version_as_new_as(tor_ver, "0.2.1.3-alpha") &&
- !tor_version_as_new_as(tor_ver, "0.2.1.23")) ||
- (tor_version_as_new_as(tor_ver, "0.2.2.0-alpha") &&
- !tor_version_as_new_as(tor_ver, "0.2.2.7-alpha"))) {
- msg = "was selected without regard for guard bandwidth";
- version_is_bad = 1;
- }
- tor_free(tor_ver);
- }
- if (!version_is_bad && entry->chosen_on_date + 3600*24*60 < now) {
- /* It's been 2 months since the date listed in our state file. */
- msg = "was selected several months ago";
- date_is_bad = 1;
- }
- if (version_is_bad || date_is_bad) { /* we need to drop it */
- char dbuf[HEX_DIGEST_LEN+1];
- tor_assert(msg);
- base16_encode(dbuf, sizeof(dbuf), entry->identity, DIGEST_LEN);
- log_fn(version_is_bad ? LOG_NOTICE : LOG_INFO, LD_CIRC,
- "Entry guard '%s' (%s) %s. (Version=%s.) Replacing it.",
- entry->nickname, dbuf, msg, ver?escaped(ver):"none");
- control_event_guard(entry->nickname, entry->identity, "DROPPED");
- entry_guard_free(entry);
- smartlist_del_keeporder(entry_guards, i--);
- log_entry_guards(LOG_INFO);
- changed = 1;
- }
- }
- return changed ? 1 : 0;
- }
- /** Remove all entry guards that have been down or unlisted for so
- * long that we don't think they'll come up again. Return 1 if we
- * removed any, or 0 if we did nothing. */
- static int
- remove_dead_entry_guards(time_t now)
- {
- char dbuf[HEX_DIGEST_LEN+1];
- char tbuf[ISO_TIME_LEN+1];
- int i;
- int changed = 0;
- for (i = 0; i < smartlist_len(entry_guards); ) {
- entry_guard_t *entry = smartlist_get(entry_guards, i);
- if (entry->bad_since &&
- ! entry->path_bias_disabled &&
- entry->bad_since + ENTRY_GUARD_REMOVE_AFTER < now) {
- base16_encode(dbuf, sizeof(dbuf), entry->identity, DIGEST_LEN);
- format_local_iso_time(tbuf, entry->bad_since);
- log_info(LD_CIRC, "Entry guard '%s' (%s) has been down or unlisted "
- "since %s local time; removing.",
- entry->nickname, dbuf, tbuf);
- control_event_guard(entry->nickname, entry->identity, "DROPPED");
- entry_guard_free(entry);
- smartlist_del_keeporder(entry_guards, i);
- log_entry_guards(LOG_INFO);
- changed = 1;
- } else
- ++i;
- }
- return changed ? 1 : 0;
- }
- /** A new directory or router-status has arrived; update the down/listed
- * status of the entry guards.
- *
- * An entry is 'down' if the directory lists it as nonrunning.
- * An entry is 'unlisted' if the directory doesn't include it.
- *
- * Don't call this on startup; only on a fresh download. Otherwise we'll
- * think that things are unlisted.
- */
- void
- entry_guards_compute_status(const or_options_t *options, time_t now)
- {
- int changed = 0;
- digestmap_t *reasons;
- if (! entry_guards)
- return;
- if (options->EntryNodes) /* reshuffle the entry guard list if needed */
- entry_nodes_should_be_added();
- reasons = digestmap_new();
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, entry)
- {
- const node_t *r = node_get_by_id(entry->identity);
- const char *reason = NULL;
- if (entry_guard_set_status(entry, r, now, options, &reason))
- changed = 1;
- if (entry->bad_since)
- tor_assert(reason);
- if (reason)
- digestmap_set(reasons, entry->identity, (char*)reason);
- }
- SMARTLIST_FOREACH_END(entry);
- if (remove_dead_entry_guards(now))
- changed = 1;
- if (remove_obsolete_entry_guards(now))
- changed = 1;
- if (changed) {
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, entry) {
- const char *reason = digestmap_get(reasons, entry->identity);
- const char *live_msg = "";
- const node_t *r = entry_is_live(entry, 0, 1, 0, &live_msg);
- log_info(LD_CIRC, "Summary: Entry %s [%s] is %s, %s%s%s, and %s%s.",
- entry->nickname,
- hex_str(entry->identity, DIGEST_LEN),
- entry->unreachable_since ? "unreachable" : "reachable",
- entry->bad_since ? "unusable" : "usable",
- reason ? ", ": "",
- reason ? reason : "",
- r ? "live" : "not live / ",
- r ? "" : live_msg);
- } SMARTLIST_FOREACH_END(entry);
- log_info(LD_CIRC, " (%d/%d entry guards are usable/new)",
- num_live_entry_guards(), smartlist_len(entry_guards));
- log_entry_guards(LOG_INFO);
- entry_guards_changed();
- }
- digestmap_free(reasons, NULL);
- }
- /** Called when a connection to an OR with the identity digest <b>digest</b>
- * is established (<b>succeeded</b>==1) or has failed (<b>succeeded</b>==0).
- * If the OR is an entry, change that entry's up/down status.
- * Return 0 normally, or -1 if we want to tear down the new connection.
- *
- * If <b>mark_relay_status</b>, also call router_set_status() on this
- * relay.
- *
- * XXX024 change succeeded and mark_relay_status into 'int flags'.
- */
- int
- entry_guard_register_connect_status(const char *digest, int succeeded,
- int mark_relay_status, time_t now)
- {
- int changed = 0;
- int refuse_conn = 0;
- int first_contact = 0;
- entry_guard_t *entry = NULL;
- int idx = -1;
- char buf[HEX_DIGEST_LEN+1];
- if (! entry_guards)
- return 0;
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, e) {
- tor_assert(e);
- if (tor_memeq(e->identity, digest, DIGEST_LEN)) {
- entry = e;
- idx = e_sl_idx;
- break;
- }
- } SMARTLIST_FOREACH_END(e);
- if (!entry)
- return 0;
- base16_encode(buf, sizeof(buf), entry->identity, DIGEST_LEN);
- if (succeeded) {
- if (entry->unreachable_since) {
- log_info(LD_CIRC, "Entry guard '%s' (%s) is now reachable again. Good.",
- entry->nickname, buf);
- entry->can_retry = 0;
- entry->unreachable_since = 0;
- entry->last_attempted = now;
- control_event_guard(entry->nickname, entry->identity, "UP");
- changed = 1;
- }
- if (!entry->made_contact) {
- entry->made_contact = 1;
- first_contact = changed = 1;
- }
- } else { /* ! succeeded */
- if (!entry->made_contact) {
- /* We've never connected to this one. */
- log_info(LD_CIRC,
- "Connection to never-contacted entry guard '%s' (%s) failed. "
- "Removing from the list. %d/%d entry guards usable/new.",
- entry->nickname, buf,
- num_live_entry_guards()-1, smartlist_len(entry_guards)-1);
- control_event_guard(entry->nickname, entry->identity, "DROPPED");
- entry_guard_free(entry);
- smartlist_del_keeporder(entry_guards, idx);
- log_entry_guards(LOG_INFO);
- changed = 1;
- } else if (!entry->unreachable_since) {
- log_info(LD_CIRC, "Unable to connect to entry guard '%s' (%s). "
- "Marking as unreachable.", entry->nickname, buf);
- entry->unreachable_since = entry->last_attempted = now;
- control_event_guard(entry->nickname, entry->identity, "DOWN");
- changed = 1;
- entry->can_retry = 0; /* We gave it an early chance; no good. */
- } else {
- char tbuf[ISO_TIME_LEN+1];
- format_iso_time(tbuf, entry->unreachable_since);
- log_debug(LD_CIRC, "Failed to connect to unreachable entry guard "
- "'%s' (%s). It has been unreachable since %s.",
- entry->nickname, buf, tbuf);
- entry->last_attempted = now;
- entry->can_retry = 0; /* We gave it an early chance; no good. */
- }
- }
- /* if the caller asked us to, also update the is_running flags for this
- * relay */
- if (mark_relay_status)
- router_set_status(digest, succeeded);
- if (first_contact) {
- /* We've just added a new long-term entry guard. Perhaps the network just
- * came back? We should give our earlier entries another try too,
- * and close this connection so we don't use it before we've given
- * the others a shot. */
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, e) {
- if (e == entry)
- break;
- if (e->made_contact) {
- const char *msg;
- const node_t *r = entry_is_live(e, 0, 1, 1, &msg);
- if (r && e->unreachable_since) {
- refuse_conn = 1;
- e->can_retry = 1;
- }
- }
- } SMARTLIST_FOREACH_END(e);
- if (refuse_conn) {
- log_info(LD_CIRC,
- "Connected to new entry guard '%s' (%s). Marking earlier "
- "entry guards up. %d/%d entry guards usable/new.",
- entry->nickname, buf,
- num_live_entry_guards(), smartlist_len(entry_guards));
- log_entry_guards(LOG_INFO);
- changed = 1;
- }
- }
- if (changed)
- entry_guards_changed();
- return refuse_conn ? -1 : 0;
- }
- /** When we try to choose an entry guard, should we parse and add
- * config's EntryNodes first? */
- static int should_add_entry_nodes = 0;
- /** Called when the value of EntryNodes changes in our configuration. */
- void
- entry_nodes_should_be_added(void)
- {
- log_info(LD_CIRC, "EntryNodes config option set. Putting configured "
- "relays at the front of the entry guard list.");
- should_add_entry_nodes = 1;
- }
- /** Adjust the entry guards list so that it only contains entries from
- * EntryNodes, adding new entries from EntryNodes to the list as needed. */
- static void
- entry_guards_set_from_config(const or_options_t *options)
- {
- smartlist_t *entry_nodes, *worse_entry_nodes, *entry_fps;
- smartlist_t *old_entry_guards_on_list, *old_entry_guards_not_on_list;
- tor_assert(entry_guards);
- should_add_entry_nodes = 0;
- if (!options->EntryNodes) {
- /* It's possible that a controller set EntryNodes, thus making
- * should_add_entry_nodes set, then cleared it again, all before the
- * call to choose_random_entry() that triggered us. If so, just return.
- */
- return;
- }
- {
- char *string = routerset_to_string(options->EntryNodes);
- log_info(LD_CIRC,"Adding configured EntryNodes '%s'.", string);
- tor_free(string);
- }
- entry_nodes = smartlist_new();
- worse_entry_nodes = smartlist_new();
- entry_fps = smartlist_new();
- old_entry_guards_on_list = smartlist_new();
- old_entry_guards_not_on_list = smartlist_new();
- /* Split entry guards into those on the list and those not. */
- routerset_get_all_nodes(entry_nodes, options->EntryNodes,
- options->ExcludeNodes, 0);
- SMARTLIST_FOREACH(entry_nodes, const node_t *,node,
- smartlist_add(entry_fps, (void*)node->identity));
- SMARTLIST_FOREACH(entry_guards, entry_guard_t *, e, {
- if (smartlist_digest_isin(entry_fps, e->identity))
- smartlist_add(old_entry_guards_on_list, e);
- else
- smartlist_add(old_entry_guards_not_on_list, e);
- });
- /* Remove all currently configured guard nodes, excluded nodes, unreachable
- * nodes, or non-Guard nodes from entry_nodes. */
- SMARTLIST_FOREACH_BEGIN(entry_nodes, const node_t *, node) {
- if (entry_guard_get_by_id_digest(node->identity)) {
- SMARTLIST_DEL_CURRENT(entry_nodes, node);
- continue;
- } else if (routerset_contains_node(options->ExcludeNodes, node)) {
- SMARTLIST_DEL_CURRENT(entry_nodes, node);
- continue;
- } else if (!fascist_firewall_allows_node(node)) {
- SMARTLIST_DEL_CURRENT(entry_nodes, node);
- continue;
- } else if (! node->is_possible_guard) {
- smartlist_add(worse_entry_nodes, (node_t*)node);
- SMARTLIST_DEL_CURRENT(entry_nodes, node);
- }
- } SMARTLIST_FOREACH_END(node);
- /* Now build the new entry_guards list. */
- smartlist_clear(entry_guards);
- /* First, the previously configured guards that are in EntryNodes. */
- smartlist_add_all(entry_guards, old_entry_guards_on_list);
- /* Next, scramble the rest of EntryNodes, putting the guards first. */
- smartlist_shuffle(entry_nodes);
- smartlist_shuffle(worse_entry_nodes);
- smartlist_add_all(entry_nodes, worse_entry_nodes);
- /* Next, the rest of EntryNodes */
- SMARTLIST_FOREACH_BEGIN(entry_nodes, const node_t *, node) {
- add_an_entry_guard(node, 0, 0);
- if (smartlist_len(entry_guards) > options->NumEntryGuards * 10)
- break;
- } SMARTLIST_FOREACH_END(node);
- log_notice(LD_GENERAL, "%d entries in guards", smartlist_len(entry_guards));
- /* Finally, free the remaining previously configured guards that are not in
- * EntryNodes. */
- SMARTLIST_FOREACH(old_entry_guards_not_on_list, entry_guard_t *, e,
- entry_guard_free(e));
- smartlist_free(entry_nodes);
- smartlist_free(worse_entry_nodes);
- smartlist_free(entry_fps);
- smartlist_free(old_entry_guards_on_list);
- smartlist_free(old_entry_guards_not_on_list);
- entry_guards_changed();
- }
- /** Return 0 if we're fine adding arbitrary routers out of the
- * directory to our entry guard list, or return 1 if we have a
- * list already and we must stick to it.
- */
- int
- entry_list_is_constrained(const or_options_t *options)
- {
- if (options->EntryNodes)
- return 1;
- if (options->UseBridges)
- return 1;
- return 0;
- }
- /** Pick a live (up and listed) entry guard from entry_guards. If
- * <b>state</b> is non-NULL, this is for a specific circuit --
- * make sure not to pick this circuit's exit or any node in the
- * exit's family. If <b>state</b> is NULL, we're looking for a random
- * guard (likely a bridge). */
- const node_t *
- choose_random_entry(cpath_build_state_t *state)
- {
- const or_options_t *options = get_options();
- smartlist_t *live_entry_guards = smartlist_new();
- smartlist_t *exit_family = smartlist_new();
- const node_t *chosen_exit =
- state?build_state_get_exit_node(state) : NULL;
- const node_t *node = NULL;
- int need_uptime = state ? state->need_uptime : 0;
- int need_capacity = state ? state->need_capacity : 0;
- int preferred_min, consider_exit_family = 0;
- if (chosen_exit) {
- nodelist_add_node_and_family(exit_family, chosen_exit);
- consider_exit_family = 1;
- }
- if (!entry_guards)
- entry_guards = smartlist_new();
- if (should_add_entry_nodes)
- entry_guards_set_from_config(options);
- if (!entry_list_is_constrained(options) &&
- smartlist_len(entry_guards) < options->NumEntryGuards)
- pick_entry_guards(options);
- retry:
- smartlist_clear(live_entry_guards);
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, entry) {
- const char *msg;
- node = entry_is_live(entry, need_uptime, need_capacity, 0, &msg);
- if (!node)
- continue; /* down, no point */
- if (node == chosen_exit)
- continue; /* don't pick the same node for entry and exit */
- if (consider_exit_family && smartlist_isin(exit_family, node))
- continue; /* avoid relays that are family members of our exit */
- #if 0 /* since EntryNodes is always strict now, this clause is moot */
- if (options->EntryNodes &&
- !routerset_contains_node(options->EntryNodes, node)) {
- /* We've come to the end of our preferred entry nodes. */
- if (smartlist_len(live_entry_guards))
- goto choose_and_finish; /* only choose from the ones we like */
- if (options->StrictNodes) {
- /* in theory this case should never happen, since
- * entry_guards_set_from_config() drops unwanted relays */
- tor_fragile_assert();
- } else {
- log_info(LD_CIRC,
- "No relays from EntryNodes available. Using others.");
- }
- }
- #endif
- smartlist_add(live_entry_guards, (void*)node);
- if (!entry->made_contact) {
- /* Always start with the first not-yet-contacted entry
- * guard. Otherwise we might add several new ones, pick
- * the second new one, and now we've expanded our entry
- * guard list without needing to. */
- goto choose_and_finish;
- }
- if (smartlist_len(live_entry_guards) >= options->NumEntryGuards)
- goto choose_and_finish; /* we have enough */
- } SMARTLIST_FOREACH_END(entry);
- if (entry_list_is_constrained(options)) {
- /* If we prefer the entry nodes we've got, and we have at least
- * one choice, that's great. Use it. */
- preferred_min = 1;
- } else {
- /* Try to have at least 2 choices available. This way we don't
- * get stuck with a single live-but-crummy entry and just keep
- * using him.
- * (We might get 2 live-but-crummy entry guards, but so be it.) */
- preferred_min = 2;
- }
- if (smartlist_len(live_entry_guards) < preferred_min) {
- if (!entry_list_is_constrained(options)) {
- /* still no? try adding a new entry then */
- /* XXX if guard doesn't imply fast and stable, then we need
- * to tell add_an_entry_guard below what we want, or it might
- * be a long time til we get it. -RD */
- node = add_an_entry_guard(NULL, 0, 0);
- if (node) {
- entry_guards_changed();
- /* XXX we start over here in case the new node we added shares
- * a family with our exit node. There's a chance that we'll just
- * load up on entry guards here, if the network we're using is
- * one big family. Perhaps we should teach add_an_entry_guard()
- * to understand nodes-to-avoid-if-possible? -RD */
- goto retry;
- }
- }
- if (!node && need_uptime) {
- need_uptime = 0; /* try without that requirement */
- goto retry;
- }
- if (!node && need_capacity) {
- /* still no? last attempt, try without requiring capacity */
- need_capacity = 0;
- goto retry;
- }
- #if 0
- /* Removing this retry logic: if we only allow one exit, and it is in the
- same family as all our entries, then we are just plain not going to win
- here. */
- if (!node && entry_list_is_constrained(options) && consider_exit_family) {
- /* still no? if we're using bridges or have strictentrynodes
- * set, and our chosen exit is in the same family as all our
- * bridges/entry guards, then be flexible about families. */
- consider_exit_family = 0;
- goto retry;
- }
- #endif
- /* live_entry_guards may be empty below. Oh well, we tried. */
- }
- choose_and_finish:
- if (entry_list_is_constrained(options)) {
- /* We need to weight by bandwidth, because our bridges or entryguards
- * were not already selected proportional to their bandwidth. */
- node = node_sl_choose_by_bandwidth(live_entry_guards, WEIGHT_FOR_GUARD);
- } else {
- /* We choose uniformly at random here, because choose_good_entry_server()
- * already weights its choices by bandwidth, so we don't want to
- * *double*-weight our guard selection. */
- node = smartlist_choose(live_entry_guards);
- }
- smartlist_free(live_entry_guards);
- smartlist_free(exit_family);
- return node;
- }
- /** Parse <b>state</b> and learn about the entry guards it describes.
- * If <b>set</b> is true, and there are no errors, replace the global
- * entry_list with what we find.
- * On success, return 0. On failure, alloc into *<b>msg</b> a string
- * describing the error, and return -1.
- */
- int
- entry_guards_parse_state(or_state_t *state, int set, char **msg)
- {
- entry_guard_t *node = NULL;
- smartlist_t *new_entry_guards = smartlist_new();
- config_line_t *line;
- time_t now = time(NULL);
- const char *state_version = state->TorVersion;
- digestmap_t *added_by = digestmap_new();
- *msg = NULL;
- for (line = state->EntryGuards; line; line = line->next) {
- if (!strcasecmp(line->key, "EntryGuard")) {
- smartlist_t *args = smartlist_new();
- node = tor_malloc_zero(sizeof(entry_guard_t));
- /* all entry guards on disk have been contacted */
- node->made_contact = 1;
- smartlist_add(new_entry_guards, node);
- smartlist_split_string(args, line->value, " ",
- SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
- if (smartlist_len(args)<2) {
- *msg = tor_strdup("Unable to parse entry nodes: "
- "Too few arguments to EntryGuard");
- } else if (!is_legal_nickname(smartlist_get(args,0))) {
- *msg = tor_strdup("Unable to parse entry nodes: "
- "Bad nickname for EntryGuard");
- } else {
- strlcpy(node->nickname, smartlist_get(args,0), MAX_NICKNAME_LEN+1);
- if (base16_decode(node->identity, DIGEST_LEN, smartlist_get(args,1),
- strlen(smartlist_get(args,1)))<0) {
- *msg = tor_strdup("Unable to parse entry nodes: "
- "Bad hex digest for EntryGuard");
- }
- }
- SMARTLIST_FOREACH(args, char*, cp, tor_free(cp));
- smartlist_free(args);
- if (*msg)
- break;
- } else if (!strcasecmp(line->key, "EntryGuardDownSince") ||
- !strcasecmp(line->key, "EntryGuardUnlistedSince")) {
- time_t when;
- time_t last_try = 0;
- if (!node) {
- *msg = tor_strdup("Unable to parse entry nodes: "
- "EntryGuardDownSince/UnlistedSince without EntryGuard");
- break;
- }
- if (parse_iso_time(line->value, &when)<0) {
- *msg = tor_strdup("Unable to parse entry nodes: "
- "Bad time in EntryGuardDownSince/UnlistedSince");
- break;
- }
- if (when > now) {
- /* It's a bad idea to believe info in the future: you can wind
- * up with timeouts that aren't allowed to happen for years. */
- continue;
- }
- if (strlen(line->value) >= ISO_TIME_LEN+ISO_TIME_LEN+1) {
- /* ignore failure */
- (void) parse_iso_time(line->value+ISO_TIME_LEN+1, &last_try);
- }
- if (!strcasecmp(line->key, "EntryGuardDownSince")) {
- node->unreachable_since = when;
- node->last_attempted = last_try;
- } else {
- node->bad_since = when;
- }
- } else if (!strcasecmp(line->key, "EntryGuardAddedBy")) {
- char d[DIGEST_LEN];
- /* format is digest version date */
- if (strlen(line->value) < HEX_DIGEST_LEN+1+1+1+ISO_TIME_LEN) {
- log_warn(LD_BUG, "EntryGuardAddedBy line is not long enough.");
- continue;
- }
- if (base16_decode(d, sizeof(d), line->value, HEX_DIGEST_LEN)<0 ||
- line->value[HEX_DIGEST_LEN] != ' ') {
- log_warn(LD_BUG, "EntryGuardAddedBy line %s does not begin with "
- "hex digest", escaped(line->value));
- continue;
- }
- digestmap_set(added_by, d, tor_strdup(line->value+HEX_DIGEST_LEN+1));
- } else if (!strcasecmp(line->key, "EntryGuardPathBias")) {
- const or_options_t *options = get_options();
- unsigned hop_cnt, success_cnt;
- if (!node) {
- *msg = tor_strdup("Unable to parse entry nodes: "
- "EntryGuardPathBias without EntryGuard");
- break;
- }
- if (tor_sscanf(line->value, "%u %u", &success_cnt, &hop_cnt) != 2) {
- log_warn(LD_GENERAL, "Unable to parse guard path bias info: "
- "Misformated EntryGuardPathBias %s", escaped(line->value));
- continue;
- }
- node->first_hops = hop_cnt;
- node->circuit_successes = success_cnt;
- log_info(LD_GENERAL, "Read %u/%u path bias for node %s",
- node->circuit_successes, node->first_hops, node->nickname);
- /* Note: We rely on the < comparison here to allow us to set a 0
- * rate and disable the feature entirely. If refactoring, don't
- * change to <= */
- if (node->circuit_successes/((double)node->first_hops)
- < pathbias_get_disable_rate(options)) {
- node->path_bias_disabled = 1;
- log_info(LD_GENERAL,
- "Path bias is too high (%u/%u); disabling node %s",
- node->circuit_successes, node->first_hops, node->nickname);
- }
- } else {
- log_warn(LD_BUG, "Unexpected key %s", line->key);
- }
- }
- SMARTLIST_FOREACH_BEGIN(new_entry_guards, entry_guard_t *, e) {
- char *sp;
- char *val = digestmap_get(added_by, e->identity);
- if (val && (sp = strchr(val, ' '))) {
- time_t when;
- *sp++ = '\0';
- if (parse_iso_time(sp, &when)<0) {
- log_warn(LD_BUG, "Can't read time %s in EntryGuardAddedBy", sp);
- } else {
- e->chosen_by_version = tor_strdup(val);
- e->chosen_on_date = when;
- }
- } else {
- if (state_version) {
- e->chosen_by_version = tor_strdup(state_version);
- e->chosen_on_date = time(NULL) - crypto_rand_int(3600*24*30);
- }
- }
- if (e->path_bias_disabled && !e->bad_since)
- e->bad_since = time(NULL);
- }
- SMARTLIST_FOREACH_END(e);
- if (*msg || !set) {
- SMARTLIST_FOREACH(new_entry_guards, entry_guard_t *, e,
- entry_guard_free(e));
- smartlist_free(new_entry_guards);
- } else { /* !err && set */
- if (entry_guards) {
- SMARTLIST_FOREACH(entry_guards, entry_guard_t *, e,
- entry_guard_free(e));
- smartlist_free(entry_guards);
- }
- entry_guards = new_entry_guards;
- entry_guards_dirty = 0;
- /* XXX024 hand new_entry_guards to this func, and move it up a
- * few lines, so we don't have to re-dirty it */
- if (remove_obsolete_entry_guards(now))
- entry_guards_dirty = 1;
- }
- digestmap_free(added_by, tor_free_);
- return *msg ? -1 : 0;
- }
- /** Our list of entry guards has changed, or some element of one
- * of our entry guards has changed. Write the changes to disk within
- * the next few minutes.
- */
- void
- entry_guards_changed(void)
- {
- time_t when;
- entry_guards_dirty = 1;
- /* or_state_save() will call entry_guards_update_state(). */
- when = get_options()->AvoidDiskWrites ? time(NULL) + 3600 : time(NULL)+600;
- or_state_mark_dirty(get_or_state(), when);
- }
- /** If the entry guard info has not changed, do nothing and return.
- * Otherwise, free the EntryGuards piece of <b>state</b> and create
- * a new one out of the global entry_guards list, and then mark
- * <b>state</b> dirty so it will get saved to disk.
- */
- void
- entry_guards_update_state(or_state_t *state)
- {
- config_line_t **next, *line;
- if (! entry_guards_dirty)
- return;
- config_free_lines(state->EntryGuards);
- next = &state->EntryGuards;
- *next = NULL;
- if (!entry_guards)
- entry_guards = smartlist_new();
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, e) {
- char dbuf[HEX_DIGEST_LEN+1];
- if (!e->made_contact)
- continue; /* don't write this one to disk */
- *next = line = tor_malloc_zero(sizeof(config_line_t));
- line->key = tor_strdup("EntryGuard");
- base16_encode(dbuf, sizeof(dbuf), e->identity, DIGEST_LEN);
- tor_asprintf(&line->value, "%s %s", e->nickname, dbuf);
- next = &(line->next);
- if (e->unreachable_since) {
- *next = line = tor_malloc_zero(sizeof(config_line_t));
- line->key = tor_strdup("EntryGuardDownSince");
- line->value = tor_malloc(ISO_TIME_LEN+1+ISO_TIME_LEN+1);
- format_iso_time(line->value, e->unreachable_since);
- if (e->last_attempted) {
- line->value[ISO_TIME_LEN] = ' ';
- format_iso_time(line->value+ISO_TIME_LEN+1, e->last_attempted);
- }
- next = &(line->next);
- }
- if (e->bad_since) {
- *next = line = tor_malloc_zero(sizeof(config_line_t));
- line->key = tor_strdup("EntryGuardUnlistedSince");
- line->value = tor_malloc(ISO_TIME_LEN+1);
- format_iso_time(line->value, e->bad_since);
- next = &(line->next);
- }
- if (e->chosen_on_date && e->chosen_by_version &&
- !strchr(e->chosen_by_version, ' ')) {
- char d[HEX_DIGEST_LEN+1];
- char t[ISO_TIME_LEN+1];
- *next = line = tor_malloc_zero(sizeof(config_line_t));
- line->key = tor_strdup("EntryGuardAddedBy");
- base16_encode(d, sizeof(d), e->identity, DIGEST_LEN);
- format_iso_time(t, e->chosen_on_date);
- tor_asprintf(&line->value, "%s %s %s",
- d, e->chosen_by_version, t);
- next = &(line->next);
- }
- if (e->first_hops) {
- *next = line = tor_malloc_zero(sizeof(config_line_t));
- line->key = tor_strdup("EntryGuardPathBias");
- tor_asprintf(&line->value, "%u %u",
- e->circuit_successes, e->first_hops);
- next = &(line->next);
- }
- } SMARTLIST_FOREACH_END(e);
- if (!get_options()->AvoidDiskWrites)
- or_state_mark_dirty(get_or_state(), 0);
- entry_guards_dirty = 0;
- }
- /** If <b>question</b> is the string "entry-guards", then dump
- * to *<b>answer</b> a newly allocated string describing all of
- * the nodes in the global entry_guards list. See control-spec.txt
- * for details.
- * For backward compatibility, we also handle the string "helper-nodes".
- * */
- int
- getinfo_helper_entry_guards(control_connection_t *conn,
- const char *question, char **answer,
- const char **errmsg)
- {
- (void) conn;
- (void) errmsg;
- if (!strcmp(question,"entry-guards") ||
- !strcmp(question,"helper-nodes")) {
- smartlist_t *sl = smartlist_new();
- char tbuf[ISO_TIME_LEN+1];
- char nbuf[MAX_VERBOSE_NICKNAME_LEN+1];
- if (!entry_guards)
- entry_guards = smartlist_new();
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, e) {
- const char *status = NULL;
- time_t when = 0;
- const node_t *node;
- if (!e->made_contact) {
- status = "never-connected";
- } else if (e->bad_since) {
- when = e->bad_since;
- status = "unusable";
- } else {
- status = "up";
- }
- node = node_get_by_id(e->identity);
- if (node) {
- node_get_verbose_nickname(node, nbuf);
- } else {
- nbuf[0] = '$';
- base16_encode(nbuf+1, sizeof(nbuf)-1, e->identity, DIGEST_LEN);
- /* e->nickname field is not very reliable if we don't know about
- * this router any longer; don't include it. */
- }
- if (when) {
- format_iso_time(tbuf, when);
- smartlist_add_asprintf(sl, "%s %s %s\n", nbuf, status, tbuf);
- } else {
- smartlist_add_asprintf(sl, "%s %s\n", nbuf, status);
- }
- } SMARTLIST_FOREACH_END(e);
- *answer = smartlist_join_strings(sl, "", 0, NULL);
- SMARTLIST_FOREACH(sl, char *, c, tor_free(c));
- smartlist_free(sl);
- }
- return 0;
- }
- /** A list of configured bridges. Whenever we actually get a descriptor
- * for one, we add it as an entry guard. Note that the order of bridges
- * in this list does not necessarily correspond to the order of bridges
- * in the torrc. */
- static smartlist_t *bridge_list = NULL;
- /** Mark every entry of the bridge list to be removed on our next call to
- * sweep_bridge_list unless it has first been un-marked. */
- void
- mark_bridge_list(void)
- {
- if (!bridge_list)
- bridge_list = smartlist_new();
- SMARTLIST_FOREACH(bridge_list, bridge_info_t *, b,
- b->marked_for_removal = 1);
- }
- /** Remove every entry of the bridge list that was marked with
- * mark_bridge_list if it has not subsequently been un-marked. */
- void
- sweep_bridge_list(void)
- {
- if (!bridge_list)
- bridge_list = smartlist_new();
- SMARTLIST_FOREACH_BEGIN(bridge_list, bridge_info_t *, b) {
- if (b->marked_for_removal) {
- SMARTLIST_DEL_CURRENT(bridge_list, b);
- bridge_free(b);
- }
- } SMARTLIST_FOREACH_END(b);
- }
- /** Initialize the bridge list to empty, creating it if needed. */
- static void
- clear_bridge_list(void)
- {
- if (!bridge_list)
- bridge_list = smartlist_new();
- SMARTLIST_FOREACH(bridge_list, bridge_info_t *, b, bridge_free(b));
- smartlist_clear(bridge_list);
- }
- /** Free the bridge <b>bridge</b>. */
- static void
- bridge_free(bridge_info_t *bridge)
- {
- if (!bridge)
- return;
- tor_free(bridge->transport_name);
- tor_free(bridge);
- }
- /** If we have a bridge configured whose digest matches <b>digest</b>, or a
- * bridge with no known digest whose address matches any of the
- * tor_addr_port_t's in <b>orports</b>, return that bridge. Else return
- * NULL. */
- static bridge_info_t *
- get_configured_bridge_by_orports_digest(const char *digest,
- const smartlist_t *orports)
- {
- if (!bridge_list)
- return NULL;
- SMARTLIST_FOREACH_BEGIN(bridge_list, bridge_info_t *, bridge)
- {
- if (tor_digest_is_zero(bridge->identity)) {
- SMARTLIST_FOREACH_BEGIN(orports, tor_addr_port_t *, ap)
- {
- if (tor_addr_compare(&bridge->addr, &ap->addr, CMP_EXACT) == 0 &&
- bridge->port == ap->port)
- return bridge;
- }
- SMARTLIST_FOREACH_END(ap);
- }
- if (digest && tor_memeq(bridge->identity, digest, DIGEST_LEN))
- return bridge;
- }
- SMARTLIST_FOREACH_END(bridge);
- return NULL;
- }
- /** If we have a bridge configured whose digest matches <b>digest</b>, or a
- * bridge with no known digest whose address matches <b>addr</b>:<b>/port</b>,
- * return that bridge. Else return NULL. */
- static bridge_info_t *
- get_configured_bridge_by_addr_port_digest(const tor_addr_t *addr,
- uint16_t port,
- const char *digest)
- {
- if (!bridge_list)
- return NULL;
- SMARTLIST_FOREACH_BEGIN(bridge_list, bridge_info_t *, bridge)
- {
- if (tor_digest_is_zero(bridge->identity) &&
- !tor_addr_compare(&bridge->addr, addr, CMP_EXACT) &&
- bridge->port == port)
- return bridge;
- if (digest && tor_memeq(bridge->identity, digest, DIGEST_LEN))
- return bridge;
- }
- SMARTLIST_FOREACH_END(bridge);
- return NULL;
- }
- /** Wrapper around get_configured_bridge_by_addr_port_digest() to look
- * it up via router descriptor <b>ri</b>. */
- static bridge_info_t *
- get_configured_bridge_by_routerinfo(const routerinfo_t *ri)
- {
- bridge_info_t *bi = NULL;
- smartlist_t *orports = router_get_all_orports(ri);
- bi = get_configured_bridge_by_orports_digest(ri->cache_info.identity_digest,
- orports);
- SMARTLIST_FOREACH(orports, tor_addr_port_t *, p, tor_free(p));
- smartlist_free(orports);
- return bi;
- }
- /** Return 1 if <b>ri</b> is one of our known bridges, else 0. */
- int
- routerinfo_is_a_configured_bridge(const routerinfo_t *ri)
- {
- return get_configured_bridge_by_routerinfo(ri) ? 1 : 0;
- }
- /** Return 1 if <b>node</b> is one of our configured bridges, else 0. */
- int
- node_is_a_configured_bridge(const node_t *node)
- {
- int retval = 0;
- smartlist_t *orports = node_get_all_orports(node);
- retval = get_configured_bridge_by_orports_digest(node->identity,
- orports) != NULL;
- SMARTLIST_FOREACH(orports, tor_addr_port_t *, p, tor_free(p));
- smartlist_free(orports);
- return retval;
- }
- /** We made a connection to a router at <b>addr</b>:<b>port</b>
- * without knowing its digest. Its digest turned out to be <b>digest</b>.
- * If it was a bridge, and we still don't know its digest, record it.
- */
- void
- learned_router_identity(const tor_addr_t *addr, uint16_t port,
- const char *digest)
- {
- bridge_info_t *bridge =
- get_configured_bridge_by_addr_port_digest(addr, port, digest);
- if (bridge && tor_digest_is_zero(bridge->identity)) {
- memcpy(bridge->identity, digest, DIGEST_LEN);
- log_notice(LD_DIR, "Learned fingerprint %s for bridge %s",
- hex_str(digest, DIGEST_LEN), fmt_addrport(addr, port));
- }
- }
- /** Return true if <b>bridge</b> has the same identity digest as
- * <b>digest</b>. If <b>digest</b> is NULL, it matches
- * bridges with unspecified identity digests. */
- static int
- bridge_has_digest(const bridge_info_t *bridge, const char *digest)
- {
- if (digest)
- return tor_memeq(digest, bridge->identity, DIGEST_LEN);
- else
- return tor_digest_is_zero(bridge->identity);
- }
- /** We are about to add a new bridge at <b>addr</b>:<b>port</b>, with optional
- * <b>digest</b> and <b>transport_name</b>. Mark for removal any previously
- * existing bridge with the same address and port, and warn the user as
- * appropriate.
- */
- static void
- bridge_resolve_conflicts(const tor_addr_t *addr, uint16_t port,
- const char *digest, const char *transport_name)
- {
- /* Iterate the already-registered bridge list:
- If you find a bridge with the same adress and port, mark it for
- removal. It doesn't make sense to have two active bridges with
- the same IP:PORT. If the bridge in question has a different
- digest or transport than <b>digest</b>/<b>transport_name</b>,
- it's probably a misconfiguration and we should warn the user.
- */
- SMARTLIST_FOREACH_BEGIN(bridge_list, bridge_info_t *, bridge) {
- if (bridge->marked_for_removal)
- continue;
- if (tor_addr_eq(&bridge->addr, addr) && (bridge->port == port)) {
- bridge->marked_for_removal = 1;
- if (!bridge_has_digest(bridge, digest) ||
- strcmp_opt(bridge->transport_name, transport_name)) {
- /* warn the user */
- char *bridge_description_new, *bridge_description_old;
- tor_asprintf(&bridge_description_new, "%s:%s:%s",
- fmt_addrport(addr, port),
- digest ? hex_str(digest, DIGEST_LEN) : "",
- transport_name ? transport_name : "");
- tor_asprintf(&bridge_description_old, "%s:%s:%s",
- fmt_addrport(&bridge->addr, bridge->port),
- tor_digest_is_zero(bridge->identity) ?
- "" : hex_str(bridge->identity,DIGEST_LEN),
- bridge->transport_name ? bridge->transport_name : "");
- log_warn(LD_GENERAL,"Tried to add bridge '%s', but we found a conflict"
- " with the already registered bridge '%s'. We will discard"
- " the old bridge and keep '%s'. If this is not what you"
- " wanted, please change your configuration file accordingly.",
- bridge_description_new, bridge_description_old,
- bridge_description_new);
- tor_free(bridge_description_new);
- tor_free(bridge_description_old);
- }
- }
- } SMARTLIST_FOREACH_END(bridge);
- }
- /** Remember a new bridge at <b>addr</b>:<b>port</b>. If <b>digest</b>
- * is set, it tells us the identity key too. If we already had the
- * bridge in our list, unmark it, and don't actually add anything new.
- * If <b>transport_name</b> is non-NULL - the bridge is associated with a
- * pluggable transport - we assign the transport to the bridge. */
- void
- bridge_add_from_config(const tor_addr_t *addr, uint16_t port,
- const char *digest, const char *transport_name)
- {
- bridge_info_t *b;
- bridge_resolve_conflicts(addr, port, digest, transport_name);
- b = tor_malloc_zero(sizeof(bridge_info_t));
- tor_addr_copy(&b->addr, addr);
- b->port = port;
- if (digest)
- memcpy(b->identity, digest, DIGEST_LEN);
- if (transport_name)
- b->transport_name = tor_strdup(transport_name);
- b->fetch_status.schedule = DL_SCHED_BRIDGE;
- if (!bridge_list)
- bridge_list = smartlist_new();
- smartlist_add(bridge_list, b);
- }
- /** Return true iff <b>routerset</b> contains the bridge <b>bridge</b>. */
- static int
- routerset_contains_bridge(const routerset_t *routerset,
- const bridge_info_t *bridge)
- {
- int result;
- extend_info_t *extinfo;
- tor_assert(bridge);
- if (!routerset)
- return 0;
- extinfo = extend_info_new(
- NULL, bridge->identity, NULL, &bridge->addr, bridge->port);
- result = routerset_contains_extendinfo(routerset, extinfo);
- extend_info_free(extinfo);
- return result;
- }
- /** If <b>digest</b> is one of our known bridges, return it. */
- static bridge_info_t *
- find_bridge_by_digest(const char *digest)
- {
- SMARTLIST_FOREACH(bridge_list, bridge_info_t *, bridge,
- {
- if (tor_memeq(bridge->identity, digest, DIGEST_LEN))
- return bridge;
- });
- return NULL;
- }
- /* DOCDOC find_transport_name_by_bridge_addrport */
- const char *
- find_transport_name_by_bridge_addrport(const tor_addr_t *addr, uint16_t port)
- {
- if (!bridge_list)
- return NULL;
- SMARTLIST_FOREACH_BEGIN(bridge_list, const bridge_info_t *, bridge) {
- if (tor_addr_eq(&bridge->addr, addr) &&
- (bridge->port == port))
- return bridge->transport_name;
- } SMARTLIST_FOREACH_END(bridge);
- return NULL;
- }
- /** If <b>addr</b> and <b>port</b> match the address and port of a
- * bridge of ours that uses pluggable transports, place its transport
- * in <b>transport</b>.
- *
- * Return 0 on success (found a transport, or found a bridge with no
- * transport, or found no bridge); return -1 if we should be using a
- * transport, but the transport could not be found.
- */
- int
- find_transport_by_bridge_addrport(const tor_addr_t *addr, uint16_t port,
- const transport_t **transport)
- {
- *transport = NULL;
- if (!bridge_list)
- return 0;
- SMARTLIST_FOREACH_BEGIN(bridge_list, const bridge_info_t *, bridge) {
- if (tor_addr_eq(&bridge->addr, addr) &&
- (bridge->port == port)) { /* bridge matched */
- if (bridge->transport_name) { /* it also uses pluggable transports */
- *transport = transport_get_by_name(bridge->transport_name);
- if (*transport == NULL) { /* it uses pluggable transports, but
- the transport could not be found! */
- return -1;
- }
- return 0;
- } else { /* bridge matched, but it doesn't use transports. */
- break;
- }
- }
- } SMARTLIST_FOREACH_END(bridge);
- *transport = NULL;
- return 0;
- }
- /** We need to ask <b>bridge</b> for its server descriptor. */
- static void
- launch_direct_bridge_descriptor_fetch(bridge_info_t *bridge)
- {
- char *address;
- const or_options_t *options = get_options();
- if (connection_get_by_type_addr_port_purpose(
- CONN_TYPE_DIR, &bridge->addr, bridge->port,
- DIR_PURPOSE_FETCH_SERVERDESC))
- return; /* it's already on the way */
- if (routerset_contains_bridge(options->ExcludeNodes, bridge)) {
- download_status_mark_impossible(&bridge->fetch_status);
- log_warn(LD_APP, "Not using bridge at %s: it is in ExcludeNodes.",
- safe_str_client(fmt_and_decorate_addr(&bridge->addr)));
- return;
- }
- address = tor_dup_addr(&bridge->addr);
- directory_initiate_command(address, &bridge->addr,
- bridge->port, 0/*no dirport*/,
- bridge->identity,
- DIR_PURPOSE_FETCH_SERVERDESC,
- ROUTER_PURPOSE_BRIDGE,
- DIRIND_ONEHOP, "authority.z", NULL, 0, 0);
- tor_free(address);
- }
- /** Fetching the bridge descriptor from the bridge authority returned a
- * "not found". Fall back to trying a direct fetch. */
- void
- retry_bridge_descriptor_fetch_directly(const char *digest)
- {
- bridge_info_t *bridge = find_bridge_by_digest(digest);
- if (!bridge)
- return; /* not found? oh well. */
- launch_direct_bridge_descriptor_fetch(bridge);
- }
- /** For each bridge in our list for which we don't currently have a
- * descriptor, fetch a new copy of its descriptor -- either directly
- * from the bridge or via a bridge authority. */
- void
- fetch_bridge_descriptors(const or_options_t *options, time_t now)
- {
- int num_bridge_auths = get_n_authorities(BRIDGE_DIRINFO);
- int ask_bridge_directly;
- int can_use_bridge_authority;
- if (!bridge_list)
- return;
- /* If we still have unconfigured managed proxies, don't go and
- connect to a bridge. */
- if (pt_proxies_configuration_pending())
- return;
- SMARTLIST_FOREACH_BEGIN(bridge_list, bridge_info_t *, bridge)
- {
- if (!download_status_is_ready(&bridge->fetch_status, now,
- IMPOSSIBLE_TO_DOWNLOAD))
- continue; /* don't bother, no need to retry yet */
- if (routerset_contains_bridge(options->ExcludeNodes, bridge)) {
- download_status_mark_impossible(&bridge->fetch_status);
- log_warn(LD_APP, "Not using bridge at %s: it is in ExcludeNodes.",
- safe_str_client(fmt_and_decorate_addr(&bridge->addr)));
- continue;
- }
- /* schedule another fetch as if this one will fail, in case it does */
- download_status_failed(&bridge->fetch_status, 0);
- can_use_bridge_authority = !tor_digest_is_zero(bridge->identity) &&
- num_bridge_auths;
- ask_bridge_directly = !can_use_bridge_authority ||
- !options->UpdateBridgesFromAuthority;
- log_debug(LD_DIR, "ask_bridge_directly=%d (%d, %d, %d)",
- ask_bridge_directly, tor_digest_is_zero(bridge->identity),
- !options->UpdateBridgesFromAuthority, !num_bridge_auths);
- if (ask_bridge_directly &&
- !fascist_firewall_allows_address_or(&bridge->addr, bridge->port)) {
- log_notice(LD_DIR, "Bridge at '%s' isn't reachable by our "
- "firewall policy. %s.",
- fmt_addrport(&bridge->addr, bridge->port),
- can_use_bridge_authority ?
- "Asking bridge authority instead" : "Skipping");
- if (can_use_bridge_authority)
- ask_bridge_directly = 0;
- else
- continue;
- }
- if (ask_bridge_directly) {
- /* we need to ask the bridge itself for its descriptor. */
- launch_direct_bridge_descriptor_fetch(bridge);
- } else {
- /* We have a digest and we want to ask an authority. We could
- * combine all the requests into one, but that may give more
- * hints to the bridge authority than we want to give. */
- char resource[10 + HEX_DIGEST_LEN];
- memcpy(resource, "fp/", 3);
- base16_encode(resource+3, HEX_DIGEST_LEN+1,
- bridge->identity, DIGEST_LEN);
- memcpy(resource+3+HEX_DIGEST_LEN, ".z", 3);
- log_info(LD_DIR, "Fetching bridge info '%s' from bridge authority.",
- resource);
- directory_get_from_dirserver(DIR_PURPOSE_FETCH_SERVERDESC,
- ROUTER_PURPOSE_BRIDGE, resource, 0);
- }
- }
- SMARTLIST_FOREACH_END(bridge);
- }
- /** If our <b>bridge</b> is configured to be a different address than
- * the bridge gives in <b>node</b>, rewrite the routerinfo
- * we received to use the address we meant to use. Now we handle
- * multihomed bridges better.
- */
- static void
- rewrite_node_address_for_bridge(const bridge_info_t *bridge, node_t *node)
- {
- /* XXXX move this function. */
- /* XXXX overridden addresses should really live in the node_t, so that the
- * routerinfo_t and the microdesc_t can be immutable. But we can only
- * do that safely if we know that no function that connects to an OR
- * does so through an address from any source other than node_get_addr().
- */
- tor_addr_t addr;
- if (node->ri) {
- routerinfo_t *ri = node->ri;
- tor_addr_from_ipv4h(&addr, ri->addr);
- if ((!tor_addr_compare(&bridge->addr, &addr, CMP_EXACT) &&
- bridge->port == ri->or_port) ||
- (!tor_addr_compare(&bridge->addr, &ri->ipv6_addr, CMP_EXACT) &&
- bridge->port == ri->ipv6_orport)) {
- /* they match, so no need to do anything */
- } else {
- if (tor_addr_family(&bridge->addr) == AF_INET) {
- ri->addr = tor_addr_to_ipv4h(&bridge->addr);
- tor_free(ri->address);
- ri->address = tor_dup_ip(ri->addr);
- ri->or_port = bridge->port;
- log_info(LD_DIR,
- "Adjusted bridge routerinfo for '%s' to match configured "
- "address %s:%d.",
- ri->nickname, ri->address, ri->or_port);
- } else if (tor_addr_family(&bridge->addr) == AF_INET6) {
- tor_addr_copy(&ri->ipv6_addr, &bridge->addr);
- ri->ipv6_orport = bridge->port;
- log_info(LD_DIR,
- "Adjusted bridge routerinfo for '%s' to match configured "
- "address %s.",
- ri->nickname, fmt_addrport(&ri->ipv6_addr, ri->ipv6_orport));
- } else {
- log_err(LD_BUG, "Address family not supported: %d.",
- tor_addr_family(&bridge->addr));
- return;
- }
- }
- /* Mark which address to use based on which bridge_t we got. */
- node->ipv6_preferred = (tor_addr_family(&bridge->addr) == AF_INET6 &&
- !tor_addr_is_null(&node->ri->ipv6_addr));
- /* XXXipv6 we lack support for falling back to another address for
- the same relay, warn the user */
- if (!tor_addr_is_null(&ri->ipv6_addr)) {
- tor_addr_port_t ap;
- node_get_pref_orport(node, &ap);
- log_notice(LD_CONFIG,
- "Bridge '%s' has both an IPv4 and an IPv6 address. "
- "Will prefer using its %s address (%s).",
- ri->nickname,
- tor_addr_family(&ap.addr) == AF_INET6 ? "IPv6" : "IPv4",
- fmt_addrport(&ap.addr, ap.port));
- }
- }
- if (node->rs) {
- routerstatus_t *rs = node->rs;
- tor_addr_from_ipv4h(&addr, rs->addr);
- if (!tor_addr_compare(&bridge->addr, &addr, CMP_EXACT) &&
- bridge->port == rs->or_port) {
- /* they match, so no need to do anything */
- } else {
- rs->addr = tor_addr_to_ipv4h(&bridge->addr);
- rs->or_port = bridge->port;
- log_info(LD_DIR,
- "Adjusted bridge routerstatus for '%s' to match "
- "configured address %s.",
- rs->nickname, fmt_addrport(&bridge->addr, rs->or_port));
- }
- }
- }
- /** We just learned a descriptor for a bridge. See if that
- * digest is in our entry guard list, and add it if not. */
- void
- learned_bridge_descriptor(routerinfo_t *ri, int from_cache)
- {
- tor_assert(ri);
- tor_assert(ri->purpose == ROUTER_PURPOSE_BRIDGE);
- if (get_options()->UseBridges) {
- int first = !any_bridge_descriptors_known();
- bridge_info_t *bridge = get_configured_bridge_by_routerinfo(ri);
- time_t now = time(NULL);
- router_set_status(ri->cache_info.identity_digest, 1);
- if (bridge) { /* if we actually want to use this one */
- node_t *node;
- /* it's here; schedule its re-fetch for a long time from now. */
- if (!from_cache)
- download_status_reset(&bridge->fetch_status);
- node = node_get_mutable_by_id(ri->cache_info.identity_digest);
- tor_assert(node);
- rewrite_node_address_for_bridge(bridge, node);
- add_an_entry_guard(node, 1, 1);
- log_notice(LD_DIR, "new bridge descriptor '%s' (%s): %s", ri->nickname,
- from_cache ? "cached" : "fresh", router_describe(ri));
- /* set entry->made_contact so if it goes down we don't drop it from
- * our entry node list */
- entry_guard_register_connect_status(ri->cache_info.identity_digest,
- 1, 0, now);
- if (first)
- routerlist_retry_directory_downloads(now);
- }
- }
- }
- /** Return 1 if any of our entry guards have descriptors that
- * are marked with purpose 'bridge' and are running. Else return 0.
- *
- * We use this function to decide if we're ready to start building
- * circuits through our bridges, or if we need to wait until the
- * directory "server/authority" requests finish. */
- int
- any_bridge_descriptors_known(void)
- {
- tor_assert(get_options()->UseBridges);
- return choose_random_entry(NULL)!=NULL ? 1 : 0;
- }
- /** Return 1 if there are any directory conns fetching bridge descriptors
- * that aren't marked for close. We use this to guess if we should tell
- * the controller that we have a problem. */
- int
- any_pending_bridge_descriptor_fetches(void)
- {
- smartlist_t *conns = get_connection_array();
- SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
- if (conn->type == CONN_TYPE_DIR &&
- conn->purpose == DIR_PURPOSE_FETCH_SERVERDESC &&
- TO_DIR_CONN(conn)->router_purpose == ROUTER_PURPOSE_BRIDGE &&
- !conn->marked_for_close &&
- conn->linked &&
- conn->linked_conn && !conn->linked_conn->marked_for_close) {
- log_debug(LD_DIR, "found one: %s", conn->address);
- return 1;
- }
- } SMARTLIST_FOREACH_END(conn);
- return 0;
- }
- /** Return 1 if we have at least one descriptor for an entry guard
- * (bridge or member of EntryNodes) and all descriptors we know are
- * down. Else return 0. If <b>act</b> is 1, then mark the down guards
- * up; else just observe and report. */
- static int
- entries_retry_helper(const or_options_t *options, int act)
- {
- const node_t *node;
- int any_known = 0;
- int any_running = 0;
- int need_bridges = options->UseBridges != 0;
- if (!entry_guards)
- entry_guards = smartlist_new();
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, e) {
- node = node_get_by_id(e->identity);
- if (node && node_has_descriptor(node) &&
- node_is_bridge(node) == need_bridges) {
- any_known = 1;
- if (node->is_running)
- any_running = 1; /* some entry is both known and running */
- else if (act) {
- /* Mark all current connections to this OR as unhealthy, since
- * otherwise there could be one that started 30 seconds
- * ago, and in 30 seconds it will time out, causing us to mark
- * the node down and undermine the retry attempt. We mark even
- * the established conns, since if the network just came back
- * we'll want to attach circuits to fresh conns. */
- connection_or_set_bad_connections(node->identity, 1);
- /* mark this entry node for retry */
- router_set_status(node->identity, 1);
- e->can_retry = 1;
- e->bad_since = 0;
- }
- }
- } SMARTLIST_FOREACH_END(e);
- log_debug(LD_DIR, "%d: any_known %d, any_running %d",
- act, any_known, any_running);
- return any_known && !any_running;
- }
- /** Do we know any descriptors for our bridges / entrynodes, and are
- * all the ones we have descriptors for down? */
- int
- entries_known_but_down(const or_options_t *options)
- {
- tor_assert(entry_list_is_constrained(options));
- return entries_retry_helper(options, 0);
- }
- /** Mark all down known bridges / entrynodes up. */
- void
- entries_retry_all(const or_options_t *options)
- {
- tor_assert(entry_list_is_constrained(options));
- entries_retry_helper(options, 1);
- }
- /** Return true if we've ever had a bridge running a Tor version that can't
- * provide microdescriptors to us. In that case fall back to asking for
- * full descriptors. Eventually all bridges will support microdescriptors
- * and we can take this check out; see bug 4013. */
- int
- any_bridges_dont_support_microdescriptors(void)
- {
- const node_t *node;
- static int ever_answered_yes = 0;
- if (!get_options()->UseBridges || !entry_guards)
- return 0;
- if (ever_answered_yes)
- return 1; /* if we ever answer 'yes', always answer 'yes' */
- SMARTLIST_FOREACH_BEGIN(entry_guards, entry_guard_t *, e) {
- node = node_get_by_id(e->identity);
- if (node && node->ri &&
- node_is_bridge(node) && node_is_a_configured_bridge(node) &&
- !tor_version_supports_microdescriptors(node->ri->platform)) {
- /* This is one of our current bridges, and we know enough about
- * it to know that it won't be able to answer our microdescriptor
- * questions. */
- ever_answered_yes = 1;
- return 1;
- }
- } SMARTLIST_FOREACH_END(e);
- return 0;
- }
- /** Release all storage held by the list of entry guards and related
- * memory structs. */
- void
- entry_guards_free_all(void)
- {
- if (entry_guards) {
- SMARTLIST_FOREACH(entry_guards, entry_guard_t *, e,
- entry_guard_free(e));
- smartlist_free(entry_guards);
- entry_guards = NULL;
- }
- clear_bridge_list();
- smartlist_free(bridge_list);
- bridge_list = NULL;
- circuit_build_times_free_timeouts(&circ_times);
- }
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