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- /* Copyright 2001 Matej Pfajfar.
- * Copyright 2001-2004 Roger Dingledine.
- * Copyright 2004 Roger Dingledine, Nick Mathewson. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- #include "or.h"
- /**
- * \file routerlist.c
- *
- * \brief Code to
- * maintain and access the global list of routerinfos for known
- * servers.
- **/
- /****************************************************************************/
- static smartlist_t *trusted_dir_servers = NULL;
- /* static function prototypes */
- static routerinfo_t *
- router_pick_directory_server_impl(int requireothers, int fascistfirewall);
- static trusted_dir_server_t *
- router_pick_trusteddirserver_impl(int requireother, int fascistfirewall);
- static void mark_all_trusteddirservers_up(void);
- static int router_resolve_routerlist(routerlist_t *dir);
- /****************************************************************************/
- /****
- * Functions to manage and access our list of known routers. (Note:
- * dirservers maintain a separate, independent list of known router
- * descriptors.)
- *****/
- /** Global list of all of the routers that we, as an OR or OP, know about. */
- static routerlist_t *routerlist = NULL;
- extern int has_fetched_directory; /**< from main.c */
- /**
- * Reload the original list of trusted dirservers, and the most recent
- * cached directory (if present).
- */
- int router_reload_router_list(void)
- {
- char filename[512];
- int is_recent;
- struct stat st;
- char *s;
- tor_assert(get_options()->DataDirectory);
- tor_snprintf(filename,sizeof(filename),"%s/cached-directory",
- get_options()->DataDirectory);
- if (stat(filename, &st)) {
- log_fn(LOG_WARN, "Unable to check status for '%s': %s", filename,
- strerror(errno));
- return 0;
- }
- s = read_file_to_str(filename,0);
- if (s) {
- log_fn(LOG_INFO, "Loading cached directory from %s", filename);
- is_recent = st.st_mtime > time(NULL) - 60*15;
- if (router_load_routerlist_from_directory(s, NULL, is_recent) < 0) {
- log_fn(LOG_WARN, "Cached directory '%s' was unparseable; ignoring.", filename);
- }
- if(routerlist &&
- ((routerlist->published_on > time(NULL) - OLD_MIN_ONION_KEY_LIFETIME/2)
- || is_recent)) {
- /* XXX use new onion key lifetime when 0.0.8 servers are obsolete */
- directory_has_arrived(st.st_mtime); /* do things we've been waiting to do */
- }
- tor_free(s);
- }
- return 0;
- }
- /* Set *<b>outp</b> to a smartlist containing a list of
- * trusted_dir_server_t * for all known trusted dirservers. Callers
- * must not modify the list or its contents.
- */
- void router_get_trusted_dir_servers(smartlist_t **outp)
- {
- if (!trusted_dir_servers)
- trusted_dir_servers = smartlist_create();
- *outp = trusted_dir_servers;
- }
- /** Try to find a running dirserver. If there are no running dirservers
- * in our routerlist, set all the authoritative ones as running again,
- * and pick one. If there are no dirservers at all in our routerlist,
- * reload the routerlist and try one last time. */
- routerinfo_t *router_pick_directory_server(int requireothers,
- int fascistfirewall) {
- routerinfo_t *choice;
- if (!routerlist)
- return NULL;
- choice = router_pick_directory_server_impl(requireothers, fascistfirewall);
- if(choice)
- return choice;
- log_fn(LOG_INFO,"No reachable router entries for dirservers. Trying them all again.");
- /* mark all authdirservers as up again */
- mark_all_trusteddirservers_up();
- /* try again */
- choice = router_pick_directory_server_impl(requireothers, fascistfirewall);
- if(choice)
- return choice;
- log_fn(LOG_INFO,"Still no %s router entries. Reloading and trying again.",
- get_options()->FascistFirewall ? "reachable" : "known");
- has_fetched_directory=0; /* reset it */
- if(router_reload_router_list()) {
- return NULL;
- }
- /* give it one last try */
- choice = router_pick_directory_server_impl(requireothers, 0);
- return choice;
- }
- trusted_dir_server_t *router_pick_trusteddirserver(int requireothers,
- int fascistfirewall) {
- trusted_dir_server_t *choice;
- choice = router_pick_trusteddirserver_impl(requireothers, fascistfirewall);
- if(choice)
- return choice;
- log_fn(LOG_INFO,"No trusted dirservers are reachable. Trying them all again.");
- /* mark all authdirservers as up again */
- mark_all_trusteddirservers_up();
- /* try again */
- choice = router_pick_trusteddirserver_impl(requireothers, fascistfirewall);
- if(choice)
- return choice;
- log_fn(LOG_WARN,"Still no dirservers %s. Reloading and trying again.",
- get_options()->FascistFirewall ? "reachable" : "known");
- has_fetched_directory=0; /* reset it */
- if(router_reload_router_list()) {
- return NULL;
- }
- /* give it one last try */
- choice = router_pick_trusteddirserver_impl(requireothers, 0);
- return choice;
- }
- /** Pick a random running router from our routerlist. If requireauth,
- * it has to be a trusted server. If requireothers, it cannot be us.
- */
- static routerinfo_t *
- router_pick_directory_server_impl(int requireothers, int fascistfirewall)
- {
- int i;
- routerinfo_t *router;
- smartlist_t *sl;
- char buf[16];
- if(!routerlist)
- return NULL;
- if(get_options()->HttpProxy)
- fascistfirewall = 0;
- /* Find all the running dirservers we know about. */
- sl = smartlist_create();
- for(i=0;i< smartlist_len(routerlist->routers); i++) {
- router = smartlist_get(routerlist->routers, i);
- if(!router->is_running || !router->dir_port)
- continue;
- if(requireothers && router_is_me(router))
- continue;
- if(fascistfirewall) {
- tor_snprintf(buf,sizeof(buf),"%d",router->dir_port);
- if (!smartlist_string_isin(get_options()->FirewallPorts, buf))
- continue;
- }
- smartlist_add(sl, router);
- }
- router = smartlist_choose(sl);
- smartlist_free(sl);
- return router;
- }
- static trusted_dir_server_t *
- router_pick_trusteddirserver_impl(int requireother, int fascistfirewall)
- {
- smartlist_t *sl;
- routerinfo_t *me;
- char buf[16];
- trusted_dir_server_t *ds;
- sl = smartlist_create();
- me = router_get_my_routerinfo();
- if (!trusted_dir_servers)
- return NULL;
- if(get_options()->HttpProxy)
- fascistfirewall = 0;
- SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, d,
- {
- if (!d->is_running) continue;
- if (requireother && me &&
- !memcmp(me->identity_digest, d->digest, DIGEST_LEN))
- continue;
- if (fascistfirewall) {
- tor_snprintf(buf,sizeof(buf),"%d",d->dir_port);
- if (!smartlist_string_isin(get_options()->FirewallPorts, buf))
- continue;
- }
- smartlist_add(sl, d);
- });
- ds = smartlist_choose(sl);
- smartlist_free(sl);
- return ds;
- }
- /** Go through and mark the auth dirservers as up */
- static void mark_all_trusteddirservers_up(void) {
- if(routerlist) {
- SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, router,
- if(router_digest_is_trusted_dir(router->identity_digest)) {
- tor_assert(router->dir_port > 0);
- router->is_running = 1;
- router->status_set_at = time(NULL);
- });
- }
- if (trusted_dir_servers) {
- SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, dir,
- dir->is_running = 1);
- }
- }
- /** Return 0 if \exists an authoritative dirserver that's currently
- * thought to be running, else return 1.
- */
- int all_trusted_directory_servers_down(void) {
- if (!trusted_dir_servers)
- return 1;
- SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, dir,
- if (dir->is_running) return 0);
- return 1;
- }
- /** Add all the family of <b>router</b> to the smartlist <b>sl</b>.
- */
- void routerlist_add_family(smartlist_t *sl, routerinfo_t *router) {
- routerinfo_t *r;
- struct config_line_t *cl;
- if (!router->declared_family)
- return;
- /* Add every r such that router declares familyness with r, and r
- * declares familyhood with router. */
- SMARTLIST_FOREACH(router->declared_family, const char *, n,
- {
- if (!(r = router_get_by_nickname(n)))
- continue;
- if (!r->declared_family)
- continue;
- SMARTLIST_FOREACH(r->declared_family, const char *, n2,
- {
- if (router_nickname_matches(router, n2))
- smartlist_add(sl, r);
- });
- });
- for (cl = get_options()->NodeFamilies; cl; cl = cl->next) {
- if (router_nickname_is_in_list(router, cl->value)) {
- add_nickname_list_to_smartlist(sl, cl->value, 0);
- }
- }
- }
- /** Given a comma-and-whitespace separated list of nicknames, see which
- * nicknames in <b>list</b> name routers in our routerlist that are
- * currently running. Add the routerinfos for those routers to <b>sl</b>.
- */
- void
- add_nickname_list_to_smartlist(smartlist_t *sl, const char *list, int warn_if_down)
- {
- routerinfo_t *router;
- smartlist_t *nickname_list;
- if(!list)
- return; /* nothing to do */
- tor_assert(sl);
- nickname_list = smartlist_create();
- smartlist_split_string(nickname_list, list, ",",
- SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
- SMARTLIST_FOREACH(nickname_list, const char *, nick, {
- if (strlen(nick) > MAX_HEX_NICKNAME_LEN) {
- log_fn(LOG_WARN,"Nickname too long; skipping");
- continue;
- }
- router = router_get_by_nickname(nick);
- if (router) {
- if (router->is_running)
- smartlist_add(sl,router);
- else
- log_fn(warn_if_down ? LOG_WARN : LOG_DEBUG,
- "Nickname list includes '%s' which is known but down.",nick);
- } else
- log_fn(has_fetched_directory ? LOG_WARN : LOG_INFO,
- "Nickname list includes '%s' which isn't a known router.",nick);
- });
- SMARTLIST_FOREACH(nickname_list, char *, nick, tor_free(nick));
- smartlist_free(nickname_list);
- }
- /** Return 1 iff any member of the comma-separated list <b>list</b> is an
- * acceptable nickname or hexdigest for <b>router</b>. Else return 0.
- */
- int
- router_nickname_is_in_list(routerinfo_t *router, const char *list)
- {
- smartlist_t *nickname_list;
- int v = 0;
- if(!list)
- return 0; /* definitely not */
- tor_assert(router);
- nickname_list = smartlist_create();
- smartlist_split_string(nickname_list, list, ",",
- SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
- SMARTLIST_FOREACH(nickname_list, const char *, cp,
- if (router_nickname_matches(router, cp)) {v=1;break;});
- SMARTLIST_FOREACH(nickname_list, char *, cp, tor_free(cp));
- smartlist_free(nickname_list);
- return v;
- }
- /** Add every router from our routerlist that is currently running to
- * <b>sl</b>.
- */
- static void
- router_add_running_routers_to_smartlist(smartlist_t *sl, int allow_unverified,
- int preferuptime, int preferbandwidth)
- {
- routerinfo_t *router;
- int i;
- if(!routerlist)
- return;
- for(i=0;i<smartlist_len(routerlist->routers);i++) {
- router = smartlist_get(routerlist->routers, i);
- if(router->is_running &&
- (router->is_verified ||
- (allow_unverified &&
- !router_is_unreliable_router(router, preferuptime, preferbandwidth)))) {
- /* If it's running, and either it's verified or we're ok picking
- * unverified routers and this one is suitable.
- */
- smartlist_add(sl, router);
- }
- }
- }
- routerinfo_t *
- routerlist_find_my_routerinfo(void) {
- routerinfo_t *router;
- int i;
- if(!routerlist)
- return NULL;
- for(i=0;i<smartlist_len(routerlist->routers);i++) {
- router = smartlist_get(routerlist->routers, i);
- if(router_is_me(router))
- return router;
- }
- return NULL;
- }
- /** How many seconds a router must be up before we'll use it for
- * reliability-critical node positions.
- */
- #define ROUTER_REQUIRED_MIN_UPTIME 3600 /* an hour */
- #define ROUTER_REQUIRED_MIN_BANDWIDTH 10000
- int
- router_is_unreliable_router(routerinfo_t *router, int need_uptime, int need_bw)
- {
- if(need_uptime && router->uptime < ROUTER_REQUIRED_MIN_UPTIME)
- return 1;
- if(need_bw && router->bandwidthcapacity < ROUTER_REQUIRED_MIN_BANDWIDTH)
- return 1;
- return 0;
- }
- static void
- routerlist_sl_remove_unreliable_routers(smartlist_t *sl)
- {
- int i;
- routerinfo_t *router;
- for (i = 0; i < smartlist_len(sl); ++i) {
- router = smartlist_get(sl, i);
- if(router_is_unreliable_router(router, 1, 0)) {
- log(LOG_DEBUG, "Router %s has insufficient uptime; deleting.",
- router->nickname);
- smartlist_del(sl, i--);
- }
- }
- }
- routerinfo_t *
- routerlist_sl_choose_by_bandwidth(smartlist_t *sl)
- {
- int i;
- routerinfo_t *router;
- smartlist_t *bandwidths;
- uint32_t this_bw, tmp, total_bw=0, rand_bw;
- uint32_t *p;
- bandwidths = smartlist_create();
- for (i = 0; i < smartlist_len(sl); ++i) {
- router = smartlist_get(sl, i);
- this_bw = (router->bandwidthcapacity < router->bandwidthrate) ?
- router->bandwidthcapacity : router->bandwidthrate;
- if(this_bw > 800000)
- this_bw = 800000; /* if they claim something huge, don't believe it */
- p = tor_malloc(sizeof(uint32_t));
- *p = this_bw;
- smartlist_add(bandwidths, p);
- total_bw += this_bw;
- // log_fn(LOG_INFO,"Recording bw %d for node %s.", this_bw, router->nickname);
- }
- if(!total_bw)
- return NULL;
- rand_bw = crypto_pseudo_rand_int(total_bw);
- // log_fn(LOG_INFO,"Total bw %d. Randomly chose %d.", total_bw, rand_bw);
- tmp = 0;
- for(i=0; ; i++) {
- tor_assert(i < smartlist_len(sl));
- p = smartlist_get(bandwidths, i);
- tmp += *p;
- router = smartlist_get(sl, i);
- // log_fn(LOG_INFO,"Considering %s. tmp = %d.", router->nickname, tmp);
- if(tmp >= rand_bw)
- break;
- }
- SMARTLIST_FOREACH(bandwidths, uint32_t*, p, tor_free(p));
- smartlist_free(bandwidths);
- router = smartlist_get(sl, i);
- // log_fn(LOG_INFO,"Picked %s.", router->nickname);
- return router;
- }
- /** Return a random running router from the routerlist. If any node
- * named in <b>preferred</b> is available, pick one of those. Never
- * pick a node named in <b>excluded</b>, or whose routerinfo is in
- * <b>excludedsmartlist</b>, even if they are the only nodes
- * available. If <b>strict</b> is true, never pick any node besides
- * those in <b>preferred</b>.
- */
- routerinfo_t *router_choose_random_node(const char *preferred,
- const char *excluded,
- smartlist_t *excludedsmartlist,
- int preferuptime, int preferbandwidth,
- int allow_unverified, int strict)
- {
- smartlist_t *sl, *excludednodes;
- routerinfo_t *choice;
- excludednodes = smartlist_create();
- add_nickname_list_to_smartlist(excludednodes,excluded,0);
- /* try the preferred nodes first */
- sl = smartlist_create();
- add_nickname_list_to_smartlist(sl,preferred,1);
- smartlist_subtract(sl,excludednodes);
- if(excludedsmartlist)
- smartlist_subtract(sl,excludedsmartlist);
- if(preferuptime)
- routerlist_sl_remove_unreliable_routers(sl);
- if(preferbandwidth)
- choice = routerlist_sl_choose_by_bandwidth(sl);
- else
- choice = smartlist_choose(sl);
- smartlist_free(sl);
- if(!choice && !strict) {
- sl = smartlist_create();
- router_add_running_routers_to_smartlist(sl, allow_unverified,
- preferuptime, preferbandwidth);
- smartlist_subtract(sl,excludednodes);
- if(excludedsmartlist)
- smartlist_subtract(sl,excludedsmartlist);
- if(preferuptime)
- routerlist_sl_remove_unreliable_routers(sl);
- if(preferbandwidth)
- choice = routerlist_sl_choose_by_bandwidth(sl);
- else
- choice = smartlist_choose(sl);
- smartlist_free(sl);
- }
- smartlist_free(excludednodes);
- if(!choice)
- log_fn(LOG_WARN,"No available nodes when trying to choose node. Failing.");
- return choice;
- }
- /** Return the router in our routerlist whose address is <b>addr</b> and
- * whose OR port is <b>port</b>. Return NULL if no such router is known.
- */
- routerinfo_t *router_get_by_addr_port(uint32_t addr, uint16_t port) {
- int i;
- routerinfo_t *router;
- if (!routerlist)
- return NULL;
- for(i=0;i<smartlist_len(routerlist->routers);i++) {
- router = smartlist_get(routerlist->routers, i);
- if ((router->addr == addr) && (router->or_port == port))
- return router;
- }
- return NULL;
- }
- /** Return true iff the digest of <b>router</b>'s identity key,
- * 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. */
- static INLINE int router_hex_digest_matches(routerinfo_t *router,
- const char *hexdigest)
- {
- char digest[DIGEST_LEN];
- tor_assert(hexdigest);
- if (hexdigest[0] == '$')
- ++hexdigest;
- if (strlen(hexdigest) != HEX_DIGEST_LEN ||
- base16_decode(digest, DIGEST_LEN, hexdigest, HEX_DIGEST_LEN)<0)
- return 0;
- else
- return (!memcmp(digest, router->identity_digest, DIGEST_LEN));
- }
- /* Return true if <b>router</b>'s nickname matches <b>nickname</b>
- * (case-insensitive), or if <b>router's</b> identity key digest
- * matches a hexadecimal value stored in <b>nickname</b>. Return
- * false otherwise.*/
- int router_nickname_matches(routerinfo_t *router, const char *nickname)
- {
- if (nickname[0]!='$' && !strcasecmp(router->nickname, nickname))
- return 1;
- else
- return router_hex_digest_matches(router, nickname);
- }
- /** Return the router in our routerlist whose (case-insensitive)
- * nickname or (case-sensitive) hexadecimal key digest is
- * <b>nickname</b>. Return NULL if no such router is known.
- */
- routerinfo_t *router_get_by_nickname(const char *nickname)
- {
- int i, maybedigest;
- routerinfo_t *router;
- char digest[DIGEST_LEN];
- tor_assert(nickname);
- if (!routerlist)
- return NULL;
- if (nickname[0] == '$')
- return router_get_by_hexdigest(nickname);
- maybedigest = (strlen(nickname) == HEX_DIGEST_LEN) &&
- (base16_decode(digest,DIGEST_LEN,nickname,HEX_DIGEST_LEN) == 0);
- for(i=0;i<smartlist_len(routerlist->routers);i++) {
- router = smartlist_get(routerlist->routers, i);
- if (0 == strcasecmp(router->nickname, nickname) ||
- (maybedigest && 0 == memcmp(digest, router->identity_digest,
- DIGEST_LEN)))
- return router;
- }
- return NULL;
- }
- /** Return true iff <b>digest</b> is the digest of the identity key of
- * a trusted directory. */
- int router_digest_is_trusted_dir(const char *digest) {
- if (!trusted_dir_servers)
- return 0;
- SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ent,
- if (!memcmp(digest, ent->digest, DIGEST_LEN)) return 1);
- return 0;
- }
- /** Return the router in our routerlist whose hexadecimal key digest
- * is <b>hexdigest</b>. Return NULL if no such router is known. */
- routerinfo_t *router_get_by_hexdigest(const char *hexdigest) {
- char digest[DIGEST_LEN];
- tor_assert(hexdigest);
- if (!routerlist)
- return NULL;
- if (hexdigest[0]=='$')
- ++hexdigest;
- if (strlen(hexdigest) != HEX_DIGEST_LEN ||
- base16_decode(digest,DIGEST_LEN,hexdigest,HEX_DIGEST_LEN) < 0)
- return NULL;
- return router_get_by_digest(digest);
- }
- /** Return the router in our routerlist whose 20-byte key digest
- * is <b>hexdigest</b>. Return NULL if no such router is known. */
- routerinfo_t *router_get_by_digest(const char *digest) {
- int i;
- routerinfo_t *router;
- tor_assert(digest);
- if (!routerlist) return NULL;
- for(i=0;i<smartlist_len(routerlist->routers);i++) {
- router = smartlist_get(routerlist->routers, i);
- if (0 == memcmp(router->identity_digest, digest, DIGEST_LEN))
- return router;
- }
- return NULL;
- }
- /** Set *<b>prouterlist</b> to the current list of all known routers. */
- void router_get_routerlist(routerlist_t **prouterlist) {
- *prouterlist = routerlist;
- }
- /** Return the publication time on the current routerlist, or 0 if we have no
- * routerlist. */
- time_t routerlist_get_published_time(void) {
- return routerlist ? routerlist->published_on : 0;
- }
- /** Free all storage held by <b>router</b>. */
- void routerinfo_free(routerinfo_t *router)
- {
- if (!router)
- return;
- tor_free(router->address);
- tor_free(router->nickname);
- tor_free(router->platform);
- if (router->onion_pkey)
- crypto_free_pk_env(router->onion_pkey);
- if (router->identity_pkey)
- crypto_free_pk_env(router->identity_pkey);
- if (router->declared_family) {
- SMARTLIST_FOREACH(router->declared_family, char *, s, tor_free(s));
- smartlist_free(router->declared_family);
- }
- exit_policy_free(router->exit_policy);
- tor_free(router);
- }
- /** Allocate a fresh copy of <b>router</b> */
- routerinfo_t *routerinfo_copy(const routerinfo_t *router)
- {
- routerinfo_t *r;
- struct exit_policy_t **e, *tmp;
- r = tor_malloc(sizeof(routerinfo_t));
- memcpy(r, router, sizeof(routerinfo_t));
- r->address = tor_strdup(r->address);
- r->nickname = tor_strdup(r->nickname);
- r->platform = tor_strdup(r->platform);
- if (r->onion_pkey)
- r->onion_pkey = crypto_pk_dup_key(r->onion_pkey);
- if (r->identity_pkey)
- r->identity_pkey = crypto_pk_dup_key(r->identity_pkey);
- e = &r->exit_policy;
- while (*e) {
- tmp = tor_malloc(sizeof(struct exit_policy_t));
- memcpy(tmp,*e,sizeof(struct exit_policy_t));
- *e = tmp;
- (*e)->string = tor_strdup((*e)->string);
- e = & ((*e)->next);
- }
- if (r->declared_family) {
- r->declared_family = smartlist_create();
- SMARTLIST_FOREACH(router->declared_family, const char *, s,
- smartlist_add(r->declared_family, tor_strdup(s)));
- }
- return r;
- }
- /** Free all storage held by a routerlist <b>rl</b> */
- void routerlist_free(routerlist_t *rl)
- {
- SMARTLIST_FOREACH(rl->routers, routerinfo_t *, r,
- routerinfo_free(r));
- smartlist_free(rl->routers);
- tor_free(rl->software_versions);
- tor_free(rl);
- }
- /** Mark the router with ID <b>digest</b> as non-running in our routerlist. */
- void router_mark_as_down(const char *digest) {
- routerinfo_t *router;
- tor_assert(digest);
- SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, d,
- if (!memcmp(d->digest, digest, DIGEST_LEN))
- d->is_running = 0);
- router = router_get_by_digest(digest);
- if(!router) /* we don't seem to know about him in the first place */
- return;
- log_fn(LOG_DEBUG,"Marking %s as down.",router->nickname);
- if (router_is_me(router))
- log_fn(LOG_WARN, "We just marked ourself as down. Are your external addresses reachable?");
- router->is_running = 0;
- router->status_set_at = time(NULL);
- }
- /** Add <b>router</b> to the routerlist, if we don't already have it. Replace
- * older entries (if any) with the same name. Note: Callers should not hold
- * their pointers to <b>router</b> after invoking this function; <b>router</b>
- * will either be inserted into the routerlist or freed. Returns 0 if the
- * router was added; -1 if it was not.
- */
- static int
- router_add_to_routerlist(routerinfo_t *router) {
- int i;
- routerinfo_t *r;
- char id_digest[DIGEST_LEN];
- tor_assert(routerlist);
- crypto_pk_get_digest(router->identity_pkey, id_digest);
- /* If we have a router with this name, and the identity key is the same,
- * choose the newer one. If the identity key has changed, drop the router.
- */
- for (i = 0; i < smartlist_len(routerlist->routers); ++i) {
- r = smartlist_get(routerlist->routers, i);
- if (!crypto_pk_cmp_keys(router->identity_pkey, r->identity_pkey)) {
- if (router->published_on > r->published_on) {
- log_fn(LOG_DEBUG, "Replacing entry for router '%s/%s' [%s]",
- router->nickname, r->nickname, hex_str(id_digest,DIGEST_LEN));
- /* Remember whether we trust this router as a dirserver. */
- /* If the address hasn't changed; no need to re-resolve. */
- if (!strcasecmp(r->address, router->address))
- router->addr = r->addr;
- routerinfo_free(r);
- smartlist_set(routerlist->routers, i, router);
- return 0;
- } else {
- log_fn(LOG_DEBUG, "Skipping old entry for router '%s'",
- router->nickname);
- /* Update the is_running status to whatever we were told. */
- r->is_running = router->is_running;
- routerinfo_free(router);
- return -1;
- }
- } else if (!strcasecmp(router->nickname, r->nickname)) {
- /* nicknames match, keys don't. */
- if (router->is_verified) {
- /* The new verified router replaces the old one; remove the
- * old one. And carry on to the end of the list, in case
- * there are more old unverifed routers with this nickname
- */
- /* mark-for-close connections using the old key, so we can
- * make new ones with the new key.
- */
- connection_t *conn;
- while((conn = connection_get_by_identity_digest(r->identity_digest,
- CONN_TYPE_OR))) {
- log_fn(LOG_INFO,"Closing conn to obsolete router '%s'", r->nickname);
- connection_mark_for_close(conn);
- }
- routerinfo_free(r);
- smartlist_del_keeporder(routerlist->routers, i--);
- } else if (r->is_verified) {
- /* Can't replace a verified router with an unverified one. */
- log_fn(LOG_DEBUG, "Skipping unverified entry for verified router '%s'",
- router->nickname);
- routerinfo_free(router);
- return -1;
- }
- }
- }
- /* We haven't seen a router with this name before. Add it to the end of
- * the list. */
- smartlist_add(routerlist->routers, router);
- return 0;
- }
- /** Remove any routers from the routerlist that are more than <b>age</b>
- * seconds old.
- *
- * (This function is just like dirserv_remove_old_servers. One day we should
- * merge them.)
- */
- void
- routerlist_remove_old_routers(int age)
- {
- int i;
- time_t cutoff;
- routerinfo_t *router;
- if (!routerlist)
- return;
- cutoff = time(NULL) - age;
- for (i = 0; i < smartlist_len(routerlist->routers); ++i) {
- router = smartlist_get(routerlist->routers, i);
- if (router->published_on <= cutoff) {
- /* Too old. Remove it. */
- log_fn(LOG_INFO,"Forgetting obsolete routerinfo for node %s.", router->nickname);
- routerinfo_free(router);
- smartlist_del(routerlist->routers, i--);
- }
- }
- }
- /*
- * Code to parse router descriptors and directories.
- */
- /** Add to the current routerlist each router stored in the
- * signed directory <b>s</b>. If pkey is provided, check the signature against
- * pkey; else check against the pkey of the signing directory server. */
- int router_load_routerlist_from_directory(const char *s,
- crypto_pk_env_t *pkey,
- int dir_is_recent)
- {
- routerlist_t *new_list = NULL;
- if (router_parse_routerlist_from_directory(s, &new_list, pkey,
- dir_is_recent)) {
- log_fn(LOG_WARN, "Couldn't parse directory.");
- return -1;
- }
- if (routerlist) {
- SMARTLIST_FOREACH(new_list->routers, routerinfo_t *, r,
- router_add_to_routerlist(r));
- smartlist_clear(new_list->routers);
- routerlist->published_on = new_list->published_on;
- tor_free(routerlist->software_versions);
- routerlist->software_versions = new_list->software_versions;
- new_list->software_versions = NULL;
- routerlist_free(new_list);
- } else {
- routerlist = new_list;
- }
- if (router_resolve_routerlist(routerlist)) {
- log_fn(LOG_WARN, "Error resolving routerlist");
- return -1;
- }
- if (get_options()->AuthoritativeDir) {
- /* Learn about the descriptors in the directory. */
- dirserv_load_from_directory_string(s);
- }
- return 0;
- }
- /** Helper function: resolve the hostname for <b>router</b>. */
- static int
- router_resolve(routerinfo_t *router)
- {
- if (tor_lookup_hostname(router->address, &router->addr) != 0
- || !router->addr) {
- log_fn(LOG_WARN,"Could not get address for router %s (%s).",
- router->address, router->nickname);
- return -1;
- }
- router->addr = ntohl(router->addr); /* get it back into host order */
- return 0;
- }
- /** Helper function: resolve every router in rl, and ensure that our own
- * routerinfo is at the front.
- */
- static int
- router_resolve_routerlist(routerlist_t *rl)
- {
- int i, remove;
- routerinfo_t *r;
- if (!rl)
- rl = routerlist;
- i = 0;
- if ((r = router_get_my_routerinfo())) {
- smartlist_insert(rl->routers, 0, routerinfo_copy(r));
- ++i;
- }
- for ( ; i < smartlist_len(rl->routers); ++i) {
- remove = 0;
- r = smartlist_get(rl->routers,i);
- if (router_is_me(r)) {
- remove = 1;
- } else if (r->addr) {
- /* already resolved. */
- } else if (router_resolve(r)) {
- log_fn(LOG_WARN, "Couldn't resolve router %s; not using", r->address);
- remove = 1;
- }
- if (remove) {
- routerinfo_free(r);
- smartlist_del_keeporder(rl->routers, i--);
- }
- }
- return 0;
- }
- /** Decide whether a given addr:port is definitely accepted, definitely
- * rejected, or neither by a given exit policy. If <b>addr</b> is 0, we
- * don't know the IP of the target address.
- *
- * Returns -1 for "rejected", 0 for "accepted", 1 for "maybe" (since IP is
- * unknown).
- */
- int router_compare_addr_to_exit_policy(uint32_t addr, uint16_t port,
- struct exit_policy_t *policy)
- {
- int maybe_reject = 0;
- int maybe_accept = 0;
- int match = 0;
- int maybe = 0;
- struct in_addr in;
- struct exit_policy_t *tmpe;
- for(tmpe=policy; tmpe; tmpe=tmpe->next) {
- // log_fn(LOG_DEBUG,"Considering exit policy %s", tmpe->string);
- maybe = 0;
- if (!addr) {
- /* Address is unknown. */
- if (port >= tmpe->prt_min && port <= tmpe->prt_max) {
- /* The port definitely matches. */
- if (tmpe->msk == 0) {
- match = 1;
- } else {
- maybe = 1;
- }
- } else if (!port) {
- /* The port maybe matches. */
- maybe = 1;
- }
- } else {
- /* Address is known */
- if ((addr & tmpe->msk) == (tmpe->addr & tmpe->msk)) {
- if (port >= tmpe->prt_min && port <= tmpe->prt_max) {
- /* Exact match for the policy */
- match = 1;
- } else if (!port) {
- maybe = 1;
- }
- }
- }
- if (maybe) {
- if (tmpe->policy_type == EXIT_POLICY_REJECT)
- maybe_reject = 1;
- else
- maybe_accept = 1;
- }
- if (match) {
- in.s_addr = htonl(addr);
- log_fn(LOG_DEBUG,"Address %s:%d matches exit policy '%s'",
- inet_ntoa(in), port, tmpe->string);
- if(tmpe->policy_type == EXIT_POLICY_ACCEPT) {
- /* If we already hit a clause that might trigger a 'reject', than we
- * can't be sure of this certain 'accept'.*/
- return maybe_reject ? ADDR_POLICY_UNKNOWN : ADDR_POLICY_ACCEPTED;
- } else {
- return maybe_accept ? ADDR_POLICY_UNKNOWN : ADDR_POLICY_REJECTED;
- }
- }
- }
- /* accept all by default. */
- return maybe_reject ? ADDR_POLICY_UNKNOWN : ADDR_POLICY_ACCEPTED;
- }
- /** Return 1 if all running routers will reject addr:port, return 0 if
- * any might accept it. */
- int router_exit_policy_all_routers_reject(uint32_t addr, uint16_t port) {
- int i;
- routerinfo_t *router;
- if (!routerlist) return 1;
- for (i=0;i<smartlist_len(routerlist->routers);i++) {
- router = smartlist_get(routerlist->routers, i);
- if (router->is_running && router_compare_addr_to_exit_policy(
- addr, port, router->exit_policy) != ADDR_POLICY_REJECTED)
- return 0; /* this one could be ok. good enough. */
- }
- return 1; /* all will reject. */
- }
- /** Return true iff <b>router</b> does not permit exit streams.
- */
- int router_exit_policy_rejects_all(routerinfo_t *router) {
- return router_compare_addr_to_exit_policy(0, 0, router->exit_policy)
- == ADDR_POLICY_REJECTED;
- }
- /** Release all space held in <b>rr</b>. */
- void running_routers_free(running_routers_t *rr)
- {
- tor_assert(rr);
- if (rr->running_routers) {
- SMARTLIST_FOREACH(rr->running_routers, char *, s, tor_free(s));
- smartlist_free(rr->running_routers);
- }
- tor_free(rr);
- }
- /** Update the running/not-running status of every router in <b>list</b>, based
- * on the contents of <b>rr</b>. */
- /* Note: this function is not yet used, since nobody publishes just
- * running-router lists yet. */
- void routerlist_update_from_runningrouters(routerlist_t *list,
- running_routers_t *rr)
- {
- routerinfo_t *me = router_get_my_routerinfo();
- smartlist_t *all_routers;
- if (!list)
- return;
- if (list->published_on >= rr->published_on)
- return;
- if (list->running_routers_updated_on >= rr->published_on)
- return;
- all_routers = smartlist_create();
- if(me) /* learn if the dirservers think I'm verified */
- smartlist_add(all_routers, me);
- smartlist_add_all(all_routers,list->routers);
- SMARTLIST_FOREACH(rr->running_routers, const char *, cp,
- routers_update_status_from_entry(all_routers, rr->published_on,
- cp, rr->is_running_routers_format));
- smartlist_free(all_routers);
- list->running_routers_updated_on = rr->published_on;
- }
- /** Update the is_running and is_verified fields of the router <b>router</b>,
- * based in its status in the list of strings stored in <b>running_list</b>.
- * All entries in <b>running_list</b> follow one of these formats:
- * <ol><li> <b>nickname</b> -- router is running and verified.
- * (running-routers format)
- * <li> !<b>nickname</b> -- router is not-running and verified.
- * (running-routers format)
- * <li> <b>nickname</b>=$<b>hexdigest</b> -- router is running and
- * verified. (router-status format)
- * (router-status format)
- * <li> !<b>nickname</b>=$<b>hexdigest</b> -- router is running and
- * verified. (router-status format)
- * <li> !<b>nickname</b> -- router is not-running and verified.
- * <li> $<b>hexdigest</b> -- router is running and unverified.
- * <li> !$<b>hexdigest</b> -- router is not-running and unverified.
- * </ol>
- *
- * Return 1 if we found router in running_list, else return 0.
- */
- int routers_update_status_from_entry(smartlist_t *routers,
- time_t list_time,
- const char *s,
- int rr_format)
- {
- int is_running = 1;
- int is_verified = 0;
- int hex_digest_set = 0;
- char nickname[MAX_NICKNAME_LEN+1];
- char hexdigest[HEX_DIGEST_LEN+1];
- char digest[DIGEST_LEN];
- const char *cp, *end;
- /* First, parse the entry. */
- cp = s;
- if (*cp == '!') {
- is_running = 0;
- ++cp;
- }
- if (*cp != '$') {
- /* It starts with a non-dollar character; that's a nickname. The nickname
- * entry will either extend to a NUL (old running-routers format) or to an
- * equals sign (new router-status format). */
- is_verified = 1;
- end = strchr(cp, '=');
- if (!end)
- end = strchr(cp,'\0');
- tor_assert(end);
- /* 'end' now points on character beyond the end of the nickname */
- if (end == cp || end-cp > MAX_NICKNAME_LEN) {
- log_fn(LOG_WARN, "Bad nickname length (%d) in router status entry (%s)",
- (int)(end-cp), s);
- return -1;
- }
- memcpy(nickname, cp, end-cp);
- nickname[end-cp]='\0';
- if (!is_legal_nickname(nickname)) {
- log_fn(LOG_WARN, "Bad nickname (%s) in router status entry (%s)",
- nickname, s);
- return -1;
- }
- cp = end;
- if (*cp == '=')
- ++cp;
- }
- /* 'end' now points to the start of a hex digest, or EOS. */
- /* Parse the hexdigest portion of the status. */
- if (*cp == '$') {
- hex_digest_set = 1;
- ++cp;
- if (strlen(cp) != HEX_DIGEST_LEN) {
- log_fn(LOG_WARN, "Bad length (%d) on digest in router status entry (%s)",
- (int)strlen(cp), s);
- return -1;
- }
- strlcpy(hexdigest, cp, sizeof(hexdigest));
- if (base16_decode(digest, DIGEST_LEN, hexdigest, HEX_DIGEST_LEN)<0) {
- log_fn(LOG_WARN, "Invalid digest in router status entry (%s)", s);
- return -1;
- }
- }
- /* Make sure that the entry was in the right format. */
- if (rr_format) {
- if (is_verified == hex_digest_set) {
- log_fn(LOG_WARN, "Invalid syntax for running-routers member (%s)", s);
- return -1;
- }
- } else {
- if (!hex_digest_set) {
- log_fn(LOG_WARN, "Invalid syntax for router-status member (%s)", s);
- return -1;
- }
- }
- /* Okay, we're done parsing. For all routers that match, update their status.
- */
- SMARTLIST_FOREACH(routers, routerinfo_t *, r,
- {
- int nickname_matches = is_verified && !strcasecmp(r->nickname, nickname);
- int digest_matches = !memcmp(digest, r->identity_digest, DIGEST_LEN);
- if (nickname_matches && (digest_matches||rr_format))
- r->is_verified = 1;
- else if (digest_matches)
- r->is_verified = 0;
- if (digest_matches || (nickname_matches&&rr_format))
- if (r->status_set_at < list_time) {
- r->is_running = is_running;
- r->status_set_at = time(NULL);
- }
- });
- return 0;
- }
- /** As router_update_status_from_entry, but consider all entries in
- * running_list. */
- int
- router_update_status_from_smartlist(routerinfo_t *router,
- time_t list_time,
- smartlist_t *running_list,
- int rr_format)
- {
- smartlist_t *rl;
- rl = smartlist_create();
- smartlist_add(rl,router);
- SMARTLIST_FOREACH(running_list, const char *, cp,
- routers_update_status_from_entry(rl,list_time,cp,rr_format));
- smartlist_free(rl);
- return 0;
- }
- /** Add to the list of authorized directory servers one at
- * <b>address</b>:<b>port</b>, with identity key <b>digest</b>. */
- void
- add_trusted_dir_server(const char *address, uint16_t port, const char *digest)
- {
- trusted_dir_server_t *ent;
- uint32_t a;
- if (!trusted_dir_servers)
- trusted_dir_servers = smartlist_create();
- if (tor_lookup_hostname(address, &a)) {
- log_fn(LOG_WARN, "Unable to lookup address for directory server at %s",
- address);
- return;
- }
- ent = tor_malloc(sizeof(trusted_dir_server_t));
- ent->address = tor_strdup(address);
- ent->addr = ntohl(a);
- ent->dir_port = port;
- ent->is_running = 1;
- memcpy(ent->digest, digest, DIGEST_LEN);
- smartlist_add(trusted_dir_servers, ent);
- }
- void clear_trusted_dir_servers(void)
- {
- if (trusted_dir_servers) {
- SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ent,
- { tor_free(ent->address); tor_free(ent); });
- smartlist_clear(trusted_dir_servers);
- } else {
- trusted_dir_servers = smartlist_create();
- }
- }
- /*
- Local Variables:
- mode:c
- indent-tabs-mode:nil
- c-basic-offset:2
- End:
- */
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