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tor/src/or/routerlist.c

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/* Copyright 2001 Matej Pfajfar.
* Copyright 2001-2004 Roger Dingledine.
* Copyright 2004-2005 Roger Dingledine, Nick Mathewson. */
/* See LICENSE for licensing information */
/* $Id$ */
const char routerlist_c_id[] = "$Id$";
/**
* \file routerlist.c
* \brief Code to
* maintain and access the global list of routerinfos for known
* servers.
**/
#include "or.h"
/****************************************************************************/
/** Global list of a trusted_dir_server_t object for each trusted directory
* server. */
static smartlist_t *trusted_dir_servers = NULL;
/* static function prototypes */
static routerinfo_t *router_pick_directory_server_impl(int requireother,
int fascistfirewall,
int for_v2_directory);
static trusted_dir_server_t *router_pick_trusteddirserver_impl(
int need_v1_support, int requireother, int fascistfirewall);
static void mark_all_trusteddirservers_up(void);
static int router_nickname_is_in_list(routerinfo_t *router, const char *list);
static int router_nickname_matches(routerinfo_t *router, const char *nickname);
static void router_normalize_routerlist(routerlist_t *rl);
/****************************************************************************/
/****
* 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 know about. */
static routerlist_t *routerlist = NULL;
extern int has_fetched_directory; /**< from main.c */
/** Global list of all of the current network_status documents that we know
* about. This list is kept sorted by published_on. */
static smartlist_t *networkstatus_list = NULL;
/** True iff networkstatus_list has changed since the last time we called
* routers_update_all_from_networkstatus. Set by router_set_networkstatus;
* cleared by routers_update_all_from_networkstatus.
*/
static int networkstatus_list_has_changed = 0;
/**
* Reload 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);
s = read_file_to_str(filename,0);
if (s) {
stat(filename, &st); /* if s is true, stat probably worked */
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, 1) < 0) {
log_fn(LOG_WARN, "Cached directory at '%s' was unparseable; ignoring.", filename);
}
if (routerlist &&
((routerlist->published_on > time(NULL) - MIN_ONION_KEY_LIFETIME/2)
|| is_recent)) {
directory_has_arrived(st.st_mtime, NULL); /* do things we've been waiting to do */
}
tor_free(s);
}
return 0;
}
/** Repopulate our list of network_status_t objects from the list cached on
* disk. Return 0 on success, -1 on failure. */
int
router_reload_networkstatus(void)
{
char filename[512];
struct stat st;
smartlist_t *entries, *bad_names;
char *s;
tor_assert(get_options()->DataDirectory);
if (!networkstatus_list)
networkstatus_list = smartlist_create();
tor_snprintf(filename,sizeof(filename),"%s/cached-status",
get_options()->DataDirectory);
entries = tor_listdir(filename);
bad_names = smartlist_create();
SMARTLIST_FOREACH(entries, const char *, fn, {
char buf[DIGEST_LEN];
if (strlen(fn) != HEX_DIGEST_LEN ||
base16_decode(buf, sizeof(buf), fn, strlen(fn))) {
log_fn(LOG_INFO,
"Skipping cached-status file with unexpected name \"%s\"",fn);
continue;
}
tor_snprintf(filename,sizeof(filename),"%s/cached-status/%s",
get_options()->DataDirectory, fn);
s = read_file_to_str(filename, 0);
if (s) {
stat(filename, &st);
if (router_set_networkstatus(s, st.st_mtime, NS_FROM_CACHE, NULL)<0) {
log_fn(LOG_WARN, "Couldn't load networkstatus from \"%s\"",filename);
}
tor_free(s);
}
});
routers_update_all_from_networkstatus();
return 0;
}
/* Router descriptor storage.
*
* Routerdescs are stored in a big file, named "cached-routers". As new
* routerdescs arrive, we append them to a journal file named
* "cached-routers.jrn".
*
* From time to time, we replace "cached-routers" with a new file containing
* only the live, non-superseded descriptors, and clear cached-routers.log.
*
* On startup, we read both files.
*/
/** The size of the router log, in bytes. */
static size_t router_journal_len = 0;
/** The size of the router store, in bytes. */
static size_t router_store_len = 0;
/** Helper: return 1 iff the router log is so big we want to rebuild the
* store. */
static int
router_should_rebuild_store(void)
{
if (router_store_len > (1<<16))
return router_journal_len > router_store_len / 2;
else
return router_journal_len > (1<<15);
}
/** Add the <b>len</b>-type router descriptor in <b>s</b> to the router
* journal. */
int
router_append_to_journal(const char *s, size_t len)
{
or_options_t *options = get_options();
size_t fname_len = strlen(options->DataDirectory)+32;
char *fname = tor_malloc(len);
tor_snprintf(fname, fname_len, "%s/cached-routers.new",
options->DataDirectory);
if (!len)
len = strlen(s);
if (append_bytes_to_file(fname, s, len, 0)) {
log_fn(LOG_WARN, "Unable to store router descriptor");
tor_free(fname);
return -1;
}
tor_free(fname);
router_journal_len += len;
return 0;
}
/** If the journal is too long, or if <b>force</b> is true, then atomically
* replace the router store with the routers currently in our routerlist, and
* clear the journal. Return 0 on success, -1 on failure.
*/
int
router_rebuild_store(int force)
{
size_t len = 0;
or_options_t *options;
size_t fname_len;
smartlist_t *chunk_list = NULL;
char *fname = NULL;
int r = -1;
if (!force && !router_should_rebuild_store())
return 0;
if (!routerlist)
return 0;
options = get_options();
fname_len = strlen(options->DataDirectory)+32;
fname = tor_malloc(fname_len);
tor_snprintf(fname, fname_len, "%s/cached-routers", options->DataDirectory);
chunk_list = smartlist_create();
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, ri,
{
sized_chunk_t *c;
if (!ri->signed_descriptor) {
log_fn(LOG_WARN, "Bug! No descriptor stored for router '%s'.",
ri->nickname);
goto done;
}
c = tor_malloc(sizeof(sized_chunk_t));
c->bytes = ri->signed_descriptor;
c->len = ri->signed_descriptor_len;
smartlist_add(chunk_list, c);
});
if (write_chunks_to_file(fname, chunk_list, 0)<0) {
log_fn(LOG_WARN, "Error writing router store to disk.");
goto done;
}
tor_snprintf(fname, fname_len, "%s/cached-routers.new",
options->DataDirectory);
write_str_to_file(fname, "", 0);
r = 0;
router_store_len = len;
router_journal_len = 0;
done:
tor_free(fname);
if (chunk_list) {
SMARTLIST_FOREACH(chunk_list, sized_chunk_t *, c, tor_free(c));
smartlist_free(chunk_list);
}
return r;
}
/** 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 and <b>retry_if_no_servers</b> is non-zero,
* set all the authoritative ones as running again, and pick one;
* if there are then no dirservers at all in our routerlist,
* reload the routerlist and try one last time. If for_runningrouters is
* true, then only pick a dirserver that can answer runningrouters queries
* (that is, a trusted dirserver, or one running 0.0.9rc5-cvs or later).
* Other args are as in router_pick_directory_server_impl().
*/
routerinfo_t *
router_pick_directory_server(int requireother,
int fascistfirewall,
int for_v2_directory,
int retry_if_no_servers)
{
routerinfo_t *choice;
if (!routerlist)
return NULL;
choice = router_pick_directory_server_impl(requireother, fascistfirewall,
for_v2_directory);
if (choice || !retry_if_no_servers)
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(requireother, fascistfirewall,
for_v2_directory);
if (choice)
return choice;
log_fn(LOG_INFO,"Still no %s router entries. Reloading and trying again.",
firewall_is_fascist() ? "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(requireother, 0,
for_v2_directory);
return choice;
}
trusted_dir_server_t *
router_get_trusteddirserver_by_digest(const char *digest)
{
if (!trusted_dir_servers)
return NULL;
SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds,
{
if (!memcmp(ds->digest, digest, DIGEST_LEN))
return ds;
});
return NULL;
}
/** Try to find a running trusted dirserver. If there are no running
* trusted dirservers and <b>retry_if_no_servers</b> is non-zero,
* set them all as running again, and try again.
* Other args are as in router_pick_trusteddirserver_impl().
*/
trusted_dir_server_t *
router_pick_trusteddirserver(int need_v1_support,
int requireother,
int fascistfirewall,
int retry_if_no_servers)
{
trusted_dir_server_t *choice;
choice = router_pick_trusteddirserver_impl(need_v1_support,
requireother, fascistfirewall);
if (choice || !retry_if_no_servers)
return choice;
log_fn(LOG_INFO,"No trusted dirservers are reachable. Trying them all again.");
mark_all_trusteddirservers_up();
return router_pick_trusteddirserver_impl(need_v1_support,
requireother, fascistfirewall);
}
/** Pick a random running verified directory server/mirror from our
* routerlist.
* If <b>fascistfirewall</b> and we're not using a proxy,
* make sure the port we pick is allowed by options-\>firewallports.
* If <b>requireother</b>, it cannot be us. If <b>for_v2_directory</b>,
* choose a directory server new enough to support the v2 directory
* functionality.
*/
static routerinfo_t *
router_pick_directory_server_impl(int requireother, int fascistfirewall,
int for_v2_directory)
{
routerinfo_t *result;
smartlist_t *sl;
if (!routerlist)
return NULL;
if (get_options()->HttpProxy)
fascistfirewall = 0;
/* Find all the running dirservers we know about. */
sl = smartlist_create();
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, router,
{
if (!router->is_running || !router->dir_port || !router->is_verified)
continue;
if (requireother && router_is_me(router))
continue;
if (fascistfirewall) {
if (!fascist_firewall_allows_address(router->addr, router->dir_port))
continue;
}
/* Before 0.1.1.6-alpha, only trusted dirservers served status info.
* Before 0.1.1.7-alpha, retrieving nonexistent server IDs could bork
* the directory server.
*/
if (for_v2_directory &&
!(tor_version_as_new_as(router->platform,"0.1.1.7-alpha") ||
router_digest_is_trusted_dir(router->identity_digest)))
continue;
smartlist_add(sl, router);
});
result = smartlist_choose(sl);
smartlist_free(sl);
return result;
}
/** Choose randomly from among the trusted dirservers that are up.
* If <b>fascistfirewall</b> and we're not using a proxy,
* make sure the port we pick is allowed by options-\>firewallports.
* If <b>requireother</b>, it cannot be us. If <b>need_v1_support</b>, choose
* a trusted authority for the v1 directory system.
*/
static trusted_dir_server_t *
router_pick_trusteddirserver_impl(int need_v1_support,
int requireother, int fascistfirewall)
{
smartlist_t *sl;
routerinfo_t *me;
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 (need_v1_support && !d->supports_v1_protocol)
continue;
if (requireother && me &&
!memcmp(me->identity_digest, d->digest, DIGEST_LEN))
continue;
if (fascistfirewall) {
if (!fascist_firewall_allows_address(d->addr, d->dir_port))
continue;
}
smartlist_add(sl, d);
});
ds = smartlist_choose(sl);
smartlist_free(sl);
return ds;
}
/** Go through and mark the authoritative 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) &&
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;
dir->n_networkstatus_failures = 0;
});
}
}
/** 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>.
* This is used to make sure we don't pick siblings in a single path.
*/
void
routerlist_add_family(smartlist_t *sl, routerinfo_t *router)
{
routerinfo_t *r;
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);
});
});
/* If the user declared any families locally, honor those too. */
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);
}
}
}
/** List of strings for nicknames we've already warned about and that are
* still unknown / unavailable. */
static smartlist_t *warned_nicknames = NULL;
/** 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();
if (!warned_nicknames)
warned_nicknames = smartlist_create();
smartlist_split_string(nickname_list, list, ",",
SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
SMARTLIST_FOREACH(nickname_list, const char *, nick, {
int warned;
if (!is_legal_nickname_or_hexdigest(nick)) {
log_fn(LOG_WARN,"Nickname %s is misformed; skipping", nick);
continue;
}
router = router_get_by_nickname(nick);
warned = smartlist_string_isin(warned_nicknames, nick);
if (router) {
if (router->is_running) {
smartlist_add(sl,router);
if (warned)
smartlist_string_remove(warned_nicknames, nick);
} else {
if (!warned) {
log_fn(warn_if_down ? LOG_WARN : LOG_DEBUG,
"Nickname list includes '%s' which is known but down.",nick);
smartlist_add(warned_nicknames, tor_strdup(nick));
}
}
} else {
if (!warned) {
log_fn(has_fetched_directory ? LOG_WARN : LOG_INFO,
"Nickname list includes '%s' which isn't a known router.",nick);
smartlist_add(warned_nicknames, tor_strdup(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.
*/
static 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 need_uptime, int need_capacity)
{
if (!routerlist)
return;
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, router,
{
if (router->is_running &&
(router->is_verified ||
(allow_unverified &&
!router_is_unreliable(router, need_uptime, need_capacity)))) {
/* 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);
}
});
}
/** Look through the routerlist until we find a router that has my key.
Return it. */
routerinfo_t *
routerlist_find_my_routerinfo(void)
{
if (!routerlist)
return NULL;
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, router,
{
if (router_is_me(router))
return router;
});
return NULL;
}
/** Find a router that's up, that has this IP address, and
* that allows exit to this address:port, or return NULL if there
* isn't a good one.
*/
routerinfo_t *
router_find_exact_exit_enclave(const char *address, uint16_t port)
{
uint32_t addr;
struct in_addr in;
if (!tor_inet_aton(address, &in))
return NULL; /* it's not an IP already */
addr = ntohl(in.s_addr);
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, router,
{
log_fn(LOG_DEBUG,"Considering %s: %d, %u==%u, %d.",
router->nickname,
router->is_running,
router->addr, addr,
router_compare_addr_to_addr_policy(addr, port, router->exit_policy));
if (router->is_running &&
router->addr == addr &&
router_compare_addr_to_addr_policy(addr, port, router->exit_policy) ==
ADDR_POLICY_ACCEPTED)
return router;
});
return NULL;
}
/** Return 1 if <b>router</b> is not suitable for these parameters, else 0.
* If <b>need_uptime</b> is non-zero, we require a minimum uptime.
* If <b>need_capacity</b> is non-zero, we require a minimum advertised
* bandwidth.
*/
int
router_is_unreliable(routerinfo_t *router, int need_uptime, int need_capacity)
{
if (need_uptime && router->uptime < ROUTER_REQUIRED_MIN_UPTIME)
return 1;
if (need_capacity && router->bandwidthcapacity < ROUTER_REQUIRED_MIN_BANDWIDTH)
return 1;
return 0;
}
/** Remove from routerlist <b>sl</b> all routers who have a low uptime. */
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, 1, 0)) {
// log(LOG_DEBUG, "Router '%s' has insufficient uptime; deleting.",
// router->nickname);
smartlist_del(sl, i--);
}
}
}
#define MAX_BELIEVABLE_BANDWIDTH 2000000 /* 2 MB/sec */
/** Choose a random element of router list <b>sl</b>, weighted by
* the advertised bandwidth of each router.
*/
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;
/* First count the total bandwidth weight, and make a smartlist
* of each value. */
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 they claim something huge, don't believe it */
if (this_bw > MAX_BELIEVABLE_BANDWIDTH)
this_bw = MAX_BELIEVABLE_BANDWIDTH;
p = tor_malloc(sizeof(uint32_t));
*p = this_bw;
smartlist_add(bandwidths, p);
total_bw += this_bw;
}
if (!total_bw) {
SMARTLIST_FOREACH(bandwidths, uint32_t*, p, tor_free(p));
smartlist_free(bandwidths);
return smartlist_choose(sl);
}
/* Second, choose a random value from the bandwidth weights. */
rand_bw = crypto_pseudo_rand_int(total_bw);
/* Last, count through sl until we get to the element we picked */
tmp = 0;
for (i=0; ; i++) {
tor_assert(i < smartlist_len(sl));
p = smartlist_get(bandwidths, i);
tmp += *p;
if (tmp >= rand_bw)
break;
}
SMARTLIST_FOREACH(bandwidths, uint32_t*, p, tor_free(p));
smartlist_free(bandwidths);
return (routerinfo_t *)smartlist_get(sl, i);
}
/** 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>.
* If <b>need_uptime</b> is non-zero, don't return a router with less
* than a minimum uptime.
* If <b>need_capacity</b> is non-zero, weight your choice by the
* advertised capacity of each router.
*/
routerinfo_t *
router_choose_random_node(const char *preferred,
const char *excluded,
smartlist_t *excludedsmartlist,
int need_uptime, int need_capacity,
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. Ignore need_uptime and need_capacity,
* since the user explicitly asked for these nodes. */
sl = smartlist_create();
add_nickname_list_to_smartlist(sl,preferred,1);
smartlist_subtract(sl,excludednodes);
if (excludedsmartlist)
smartlist_subtract(sl,excludedsmartlist);
choice = smartlist_choose(sl);
smartlist_free(sl);
if (!choice && !strict) {
/* Then give up on our preferred choices: any node
* will do that has the required attributes. */
sl = smartlist_create();
router_add_running_routers_to_smartlist(sl, allow_unverified,
need_uptime, need_capacity);
smartlist_subtract(sl,excludednodes);
if (excludedsmartlist)
smartlist_subtract(sl,excludedsmartlist);
if (need_uptime)
routerlist_sl_remove_unreliable_routers(sl);
if (need_capacity)
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 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] == '$')
++hexdigest;
if (strlen(hexdigest) != HEX_DIGEST_LEN ||
base16_decode(digest, DIGEST_LEN, hexdigest, HEX_DIGEST_LEN)<0)
return 0;
return (!memcmp(digest, router->identity_digest, DIGEST_LEN));
}
/** Return true if <b>router</b>'s nickname matches <b>nickname</b>
* (case-insensitive), or if <b>router's</b> identity key digest
* matches a hexadecimal value stored in <b>nickname</b>. Return
* false otherwise. */
static int
router_nickname_matches(routerinfo_t *router, const char *nickname)
{
if (nickname[0]!='$' && !strcasecmp(router->nickname, nickname))
return 1;
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 maybedigest;
char digest[DIGEST_LEN];
tor_assert(nickname);
if (!routerlist)
return NULL;
if (nickname[0] == '$')
return router_get_by_hexdigest(nickname);
if (server_mode(get_options()) &&
!strcasecmp(nickname, get_options()->Nickname))
return router_get_my_routerinfo();
maybedigest = (strlen(nickname) == HEX_DIGEST_LEN) &&
(base16_decode(digest,DIGEST_LEN,nickname,HEX_DIGEST_LEN) == 0);
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, router,
{
if (0 == strcasecmp(router->nickname, nickname) ||
(maybedigest && 0 == memcmp(digest, router->identity_digest,
DIGEST_LEN)))
return router;
});
return NULL;
}
/** Return true iff <b>digest</b> is the digest of the identity key of
* a trusted directory. */
int
router_digest_is_trusted_dir(const char *digest)
{
if (!trusted_dir_servers)
return 0;
SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ent,
if (!memcmp(digest, ent->digest, DIGEST_LEN)) return 1);
return 0;
}
/** Return the router in our routerlist whose hexadecimal key digest
* is <b>hexdigest</b>. Return NULL if no such router is known. */
routerinfo_t *
router_get_by_hexdigest(const char *hexdigest)
{
char digest[DIGEST_LEN];
tor_assert(hexdigest);
if (!routerlist)
return NULL;
if (hexdigest[0]=='$')
++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>digest</b>. Return NULL if no such router is known. */
routerinfo_t *
router_get_by_digest(const char *digest)
{
tor_assert(digest);
if (!routerlist) return NULL;
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t*, router,
{
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->signed_descriptor);
tor_free(router->address);
tor_free(router->nickname);
tor_free(router->platform);
tor_free(router->contact_info);
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);
}
addr_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;
addr_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->signed_descriptor)
r->signed_descriptor = tor_strdup(r->signed_descriptor);
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(addr_policy_t));
memcpy(tmp,*e,sizeof(addr_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)
{
tor_assert(rl);
SMARTLIST_FOREACH(rl->routers, routerinfo_t *, r,
routerinfo_free(r));
smartlist_free(rl->routers);
tor_free(rl);
}
/** Free all entries in the current router list. */
void
routerlist_free_current(void)
{
if (routerlist)
routerlist_free(routerlist);
routerlist = NULL;
if (warned_nicknames) {
SMARTLIST_FOREACH(warned_nicknames, char *, cp, tor_free(cp));
smartlist_free(warned_nicknames);
warned_nicknames = NULL;
}
}
/** Free all storage held by the routerstatus object <b>rs</b>. */
void
routerstatus_free(routerstatus_t *rs)
{
tor_free(rs);
}
/** Free all storage held by the networkstatus object <b>ns</b>. */
void
networkstatus_free(networkstatus_t *ns)
{
tor_free(ns->source_address);
tor_free(ns->contact);
if (ns->signing_key)
crypto_free_pk_env(ns->signing_key);
tor_free(ns->client_versions);
tor_free(ns->server_versions);
if (ns->entries) {
SMARTLIST_FOREACH(ns->entries, routerstatus_t *, rs, routerstatus_free(rs));
smartlist_free(ns->entries);
}
tor_free(ns);
}
/** Free all entries in the list of trusted directory servers. */
void
free_trusted_dir_servers(void)
{
if (trusted_dir_servers) {
SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds,
{ tor_free(ds->address); tor_free(ds); });
smartlist_free(trusted_dir_servers);
trusted_dir_servers = NULL;
}
}
/** 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 router '%s' as down.",router->nickname);
if (router_is_me(router) && !we_are_hibernating())
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> if this function fails; <b>router</b>
* will either be inserted into the routerlist or freed.
*
* Returns >= 0 if the router was added; less than 0 if it was not.
*
* If we're returning non-zero, then assign to *<b>msg</b> a static string
* describing the reason for not liking the routerinfo.
*
* If the return value is less than -1, there was a problem with the
* routerinfo. If the return value is equal to -1, then the routerinfo was
* fine, but out-of-date. If the return value is equal to 1, the
* routerinfo was accepted, but we should notify the generator of the
* descriptor using the message *<b>msg</b>.
*/
int
router_add_to_routerlist(routerinfo_t *router, const char **msg)
{
int i;
char id_digest[DIGEST_LEN];
int authdir = get_options()->AuthoritativeDir;
int authdir_verified = 0;
tor_assert(msg);
if (!routerlist) {
routerlist = tor_malloc_zero(sizeof(routerlist_t));
routerlist->routers = smartlist_create();
}
crypto_pk_get_digest(router->identity_pkey, id_digest);
if (authdir) {
if (dirserv_wants_to_reject_router(router, &authdir_verified, msg)) {
tor_assert(*msg);
routerinfo_free(router);
return -2;
}
router->is_verified = authdir_verified;
router->is_named = router->is_verified; /*XXXX NM not right. */
if (tor_version_as_new_as(router->platform,"0.1.0.2-rc"))
router->is_verified = 1;
}
/* 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) {
routerinfo_t *old_router = smartlist_get(routerlist->routers, i);
if (!crypto_pk_cmp_keys(router->identity_pkey,old_router->identity_pkey)) {
if (router->published_on <= old_router->published_on) {
log_fn(LOG_DEBUG, "Skipping not-new descriptor for router '%s'",
router->nickname);
if (authdir) {
/* Update the is_verified status based on our lookup. */
old_router->is_verified = router->is_verified;
old_router->is_named = router->is_named;
} else {
/* Update the is_running status to whatever we were told. */
old_router->is_running = router->is_running;
}
routerinfo_free(router);
*msg = "Router descriptor was not new.";
return -1;
} else {
int unreachable = 0;
log_fn(LOG_DEBUG, "Replacing entry for router '%s/%s' [%s]",
router->nickname, old_router->nickname,
hex_str(id_digest,DIGEST_LEN));
if (router->addr == old_router->addr &&
router->or_port == old_router->or_port) {
/* these carry over when the address and orport are unchanged.*/
router->last_reachable = old_router->last_reachable;
router->testing_since = old_router->testing_since;
router->num_unreachable_notifications =
old_router->num_unreachable_notifications;
}
if (authdir &&
dirserv_thinks_router_is_blatantly_unreachable(router, time(NULL))) {
if (router->num_unreachable_notifications >= 3) {
unreachable = 1;
log_fn(LOG_NOTICE, "Notifying server '%s' that it's unreachable. (ContactInfo '%s', platform '%s').",
router->nickname, router->contact_info ? router->contact_info : "",
router->platform ? router->platform : "");
} else {
log_fn(LOG_INFO,"'%s' may be unreachable -- the %d previous descriptors were thought to be unreachable.", router->nickname, router->num_unreachable_notifications);
router->num_unreachable_notifications++;
}
}
routerinfo_free(old_router);
smartlist_set(routerlist->routers, i, router);
directory_set_dirty();
*msg = unreachable ? "Dirserver believes your ORPort is unreachable" :
authdir_verified ? "Verified server updated" :
"Unverified server updated. (Have you sent us your key fingerprint?)";
return unreachable ? 1 : 0;
}
} else if (!strcasecmp(router->nickname, old_router->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 unverified 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(
old_router->identity_digest, CONN_TYPE_OR))) {
log_fn(LOG_INFO,"Closing conn to obsolete router '%s'",
old_router->nickname);
connection_mark_for_close(conn);
}
routerinfo_free(old_router);
smartlist_del_keeporder(routerlist->routers, i--);
} else if (old_router->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);
*msg = "Already have verified router with same nickname and different key.";
return -2;
}
}
}
/* We haven't seen a router with this name before. Add it to the end of
* the list. */
smartlist_add(routerlist->routers, router);
directory_set_dirty();
return 0;
}
/** Remove any routers from the routerlist that are more than <b>age</b>
* seconds old.
*/
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 router '%s'", router->nickname);
routerinfo_free(router);
smartlist_del(routerlist->routers, i--);
}
}
}
/**
* Code to parse a single router descriptor and insert it into the
* routerlist. Return -1 if the descriptor was ill-formed; 0 if the
* descriptor was well-formed but could not be added; and 1 if the
* descriptor was added.
*
* If we don't add it and <b>msg</b> is not NULL, then assign to
* *<b>msg</b> a static string describing the reason for refusing the
* descriptor.
*
* This is used only by the controller.
*/
int
router_load_single_router(const char *s, const char **msg)
{
routerinfo_t *ri;
tor_assert(msg);
*msg = NULL;
if (!(ri = router_parse_entry_from_string(s, NULL))) {
log_fn(LOG_WARN, "Error parsing router descriptor; dropping.");
*msg = "Couldn't parse router descriptor.";
return -1;
}
if (router_is_me(ri)) {
log_fn(LOG_WARN, "Router's identity key matches mine; dropping.");
*msg = "Router's identity key matches mine.";
routerinfo_free(ri);
return 0;
}
#if 0
if (routerlist && routerlist->running_routers) {
running_routers_t *rr = routerlist->running_routers;
router_update_status_from_smartlist(ri,
rr->published_on,
rr->running_routers);
}
#endif
/* XXXX011 update router status from networkstatus!! */
if (router_add_to_routerlist(ri, msg)<0) {
log_fn(LOG_WARN, "Couldn't add router to list: %s Dropping.",
*msg?*msg:"(No message).");
/* we've already assigned to *msg now, and ri is already freed */
return 0;
} else {
smartlist_t *changed = smartlist_create();
smartlist_add(changed, ri);
control_event_descriptors_changed(changed);
smartlist_free(changed);
}
log_fn(LOG_DEBUG, "Added router to list");
return 1;
}
/** 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.
*
* If <b>dir_is_recent</b> is non-zero, then examine the
* Recommended-versions line and take appropriate action.
*
* If <b>dir_is_cached</b> is non-zero, then we're reading it
* from the cache so don't bother to re-write it to the cache.
*/
int
router_load_routerlist_from_directory(const char *s,
crypto_pk_env_t *pkey,
int dir_is_recent,
int dir_is_cached)
{
routerlist_t *new_list = NULL;
if (router_parse_routerlist_from_directory(s, &new_list, pkey,
dir_is_recent,
!dir_is_cached)) {
log_fn(LOG_WARN, "Couldn't parse directory.");
return -1;
}
if (routerlist) {
/* Merge the new_list into routerlist, then free new_list. Also
* keep a list of changed descriptors to inform controllers. */
smartlist_t *changed = smartlist_create();
SMARTLIST_FOREACH(new_list->routers, routerinfo_t *, r,
{
const char *msg;
if (router_add_to_routerlist(r,&msg)>=0)
smartlist_add(changed, r);
});
smartlist_clear(new_list->routers);
routerlist->published_on = new_list->published_on;
routerlist_free(new_list);
control_event_descriptors_changed(changed);
smartlist_free(changed);
} else {
routerlist = new_list;
control_event_descriptors_changed(routerlist->routers);
}
router_normalize_routerlist(routerlist);
return 0;
}
/** Helper: return a newly allocated string containing the name of the filename
* where we plan to cache <b>ns</b>. */
static char *
networkstatus_get_cache_filename(const networkstatus_t *ns)
{
const char *datadir = get_options()->DataDirectory;
size_t len = strlen(datadir)+64;
char fp[HEX_DIGEST_LEN+1];
char *fn = tor_malloc(len+1);
base16_encode(fp, HEX_DIGEST_LEN+1, ns->identity_digest, DIGEST_LEN);
tor_snprintf(fn, len, "%s/cached-status/%s",datadir,fp);
return fn;
}
/** Helper for smartlist_sort: Compare two networkstatus objects by
* publication date. */
static int
_compare_networkstatus_published_on(const void **_a, const void **_b)
{
const networkstatus_t *a = *_a, *b = *_b;
if (a->published_on < b->published_on)
return -1;
else if (a->published_on > b->published_on)
return 1;
else
return 0;
}
/** How far in the future do we allow a network-status to get before removing
* it? (seconds) */
#define NETWORKSTATUS_ALLOW_SKEW (48*60*60)
/** Given a string <b>s</b> containing a network status that we received at
* <b>arrived_at</b> from <b>source</b>, try to parse it, see if we want to
* store it, and put it into our cache is necessary.
*
* If <b>source</b> is NS_FROM_DIR or NS_FROM_CACHE, do not replace our
* own networkstatus_t (if we're a directory server).
*
* If <b>source</b> is NS_FROM_CACHE, do not write our networkstatus_t to the
* cache.
*
* If <b>requested_fingerprints</b> is provided, it must contain a list of
* uppercased identity fingerprints. Do not update any networkstatus whose
* fingerprint is not on the list; after updating a networkstatus, remove its
* fingerprint from the list.
*
* Return 0 on success, -1 on failure.
*/
int
router_set_networkstatus(const char *s, time_t arrived_at,
networkstatus_source_t source, smartlist_t *requested_fingerprints)
{
networkstatus_t *ns;
int i, found;
time_t now;
int skewed = 0;
trusted_dir_server_t *trusted_dir;
char fp[HEX_DIGEST_LEN+1];
ns = networkstatus_parse_from_string(s);
if (!ns) {
log_fn(LOG_WARN, "Couldn't parse network status.");
return -1;
}
if (!(trusted_dir=router_get_trusteddirserver_by_digest(ns->identity_digest))) {
log_fn(LOG_INFO, "Network status was signed, but not by an authoritative directory we recognize.");
networkstatus_free(ns);
return -1;
}
now = time(NULL);
if (arrived_at > now)
arrived_at = now;
ns->received_on = arrived_at;
if (ns->published_on > now + NETWORKSTATUS_ALLOW_SKEW) {
log_fn(LOG_WARN, "Network status was published in the future (?). Somebody is skewed here: check your clock. Not caching.");
skewed = 1;
}
if (!networkstatus_list)
networkstatus_list = smartlist_create();
if (source == NS_FROM_DIR && router_digest_is_me(ns->identity_digest)) {
/* Don't replace our own networkstatus when we get it from somebody else. */
networkstatus_free(ns);
return 0;
}
base16_encode(fp, HEX_DIGEST_LEN+1, ns->identity_digest, DIGEST_LEN);
if (requested_fingerprints) {
if (smartlist_string_isin(requested_fingerprints, fp)) {
smartlist_string_remove(requested_fingerprints, fp);
} else {
char *requested = smartlist_join_strings(requested_fingerprints," ",0,NULL);
log_fn(LOG_WARN, "We received a network status with a fingerprint (%s) that we never requested. (%s) Dropping.", fp, requested);
tor_free(requested);
return 0;
}
}
if (source != NS_FROM_CACHE)
trusted_dir->n_networkstatus_failures = 0;
found = 0;
for (i=0; i < smartlist_len(networkstatus_list); ++i) {
networkstatus_t *old_ns = smartlist_get(networkstatus_list, i);
if (!memcmp(old_ns->identity_digest, ns->identity_digest, DIGEST_LEN)) {
if (!memcmp(old_ns->networkstatus_digest,
ns->networkstatus_digest, DIGEST_LEN)) {
/* Same one we had before. */
networkstatus_free(ns);
log_fn(LOG_NOTICE, "Dropping network-status (%s); already have it.",fp);
if (old_ns->received_on < arrived_at)
/* XXXX We should touch the cache file. NM */
old_ns->received_on = arrived_at;
return 0;
} else if (old_ns->published_on >= ns->published_on) {
log_fn(LOG_NOTICE, "Dropping network-status (%s); we have a newer one for this authority.", fp);
networkstatus_free(ns);
return 0;
} else {
networkstatus_free(old_ns);
smartlist_set(networkstatus_list, i, ns);
found = 1;
break;
}
}
}
if (!found)
smartlist_add(networkstatus_list, ns);
/*XXXX011 downgrade to INFO NM */
log_fn(LOG_NOTICE, "New networkstatus %s (%s).",
source == NS_FROM_CACHE?"from our cache":
(source==NS_FROM_DIR?"from a directory server":"from this authority"),
fp);
networkstatus_list_has_changed = 1;
smartlist_sort(networkstatus_list, _compare_networkstatus_published_on);
if (source != NS_FROM_CACHE && !skewed) {
char *fn = networkstatus_get_cache_filename(ns);
if (write_str_to_file(fn, s, 0)<0) {
log_fn(LOG_NOTICE, "Couldn't write cached network status to \"%s\"", fn);
}
tor_free(fn);
}
if (get_options()->DirPort && !skewed)
dirserv_set_cached_networkstatus_v2(s, fp, ns->published_on);
return 0;
}
/** How old do we allow a network-status to get before removing it completely? */
#define MAX_NETWORKSTATUS_AGE (10*24*60*60)
/** Remove all very-old network_status_t objects from memory and from the
* disk cache. */
void
networkstatus_list_clean(time_t now)
{
int i;
if (!networkstatus_list)
return;
for (i = 0; i < smartlist_len(networkstatus_list); ++i) {
networkstatus_t *ns = smartlist_get(networkstatus_list, i);
char *fname = NULL;;
if (ns->published_on + MAX_NETWORKSTATUS_AGE > now)
continue;
/* Okay, this one is too old. Remove it from the list, and delete it
* from the cache. */
smartlist_del(networkstatus_list, i--);
fname = networkstatus_get_cache_filename(ns);
if (file_status(fname) == FN_FILE) {
log_fn(LOG_INFO, "Removing too-old networkstatus in %s", fname);
unlink(fname);
}
tor_free(fname);
if (get_options()->DirPort) {
char fp[HEX_DIGEST_LEN+1];
base16_encode(fp, sizeof(fp), ns->identity_digest, DIGEST_LEN);
dirserv_set_cached_networkstatus_v2(NULL, fp, 0);
}
networkstatus_free(ns);
}
}
/** Helper for bsearching a list of routerstatus_t pointers.*/
static int
_compare_digest_to_routerstatus_entry(const void *_key, const void **_member)
{
const char *key = _key;
const routerstatus_t *rs = *_member;
return memcmp(key, rs->identity_digest, DIGEST_LEN);
}
/** Return the entry in <b>ns</b> for the identity digest <b>digest</b>, or
* NULL if none was found. */
routerstatus_t *
networkstatus_find_entry(networkstatus_t *ns, const char *digest)
{
return smartlist_bsearch(ns->entries, digest,
_compare_digest_to_routerstatus_entry);
}
/* XXXX These should be configurable, perhaps? NM */
#define AUTHORITY_NS_CACHE_INTERVAL 10*60
#define NONAUTHORITY_NS_CACHE_INTERVAL 15*60
/** We are a directory server, and so cache network_status documents.
* Initiate downloads as needed to update them. For authorities, this means
* asking each trusted directory for its network-status. For caches, this means
* asking a random authority for all network-statuses.
*/
void
update_networkstatus_cache_downloads(time_t now)
{
static time_t last_downloaded = 0;
int authority = authdir_mode(get_options());
int interval =
authority ? AUTHORITY_NS_CACHE_INTERVAL : NONAUTHORITY_NS_CACHE_INTERVAL;
/*XXXXX NM we should retry on failure. */
if (last_downloaded + interval >= now)
return;
if (!trusted_dir_servers)
return;
last_downloaded = now;
if (authority) {
/* An authority launches a separate connection for everybody. */
SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds,
{
char resource[HEX_DIGEST_LEN+6];
if (router_digest_is_me(ds->digest))
continue;
if (connection_get_by_type_addr_port_purpose(
CONN_TYPE_DIR, ds->addr, ds->dir_port,
DIR_PURPOSE_FETCH_NETWORKSTATUS)) {
/* We are already fetching this one. */
continue;
}
strlcpy(resource, "fp/", sizeof(resource));
base16_encode(resource+3, sizeof(resource)-3, ds->digest, DIGEST_LEN);
strlcat(resource, ".z", sizeof(resource));
directory_get_from_dirserver(DIR_PURPOSE_FETCH_NETWORKSTATUS,resource,1);
});
} else {
/* A non-authority cache launches one connection to a random authority. */
/* (Check whether we're currently fetching network-status objects.) */
if (!connection_get_by_type_purpose(CONN_TYPE_DIR,
DIR_PURPOSE_FETCH_NETWORKSTATUS))
directory_get_from_dirserver(DIR_PURPOSE_FETCH_NETWORKSTATUS,"all.z",1);
}
}
/*XXXX Should these be configurable? NM*/
/** How old (in seconds) can a network-status be before we try replacing it? */
#define NETWORKSTATUS_MAX_VALIDITY (48*60*60)
/** How long (in seconds) does a client wait after getting a network status
* before downloading the next in sequence? */
#define NETWORKSTATUS_CLIENT_DL_INTERVAL (30*60)
/* How many times do we allow a networkstatus download to fail before we
* assume that the authority isn't publishing? */
#define NETWORKSTATUS_N_ALLOWABLE_FAILURES 3
/** We are not a directory cache or authority. Update our network-status list
* by launching a new directory fetch for enough network-status documents "as
* necessary". See function comments for implementation details.
*/
void
update_networkstatus_client_downloads(time_t now)
{
int n_live = 0, needed = 0, n_running_dirservers, n_dirservers, i;
int most_recent_idx = -1;
trusted_dir_server_t *most_recent = NULL;
time_t most_recent_received = 0;
char *resource, *cp;
size_t resource_len;
if (connection_get_by_type_purpose(CONN_TYPE_DIR,
DIR_PURPOSE_FETCH_NETWORKSTATUS))
return;
/* This is a little tricky. We want to download enough network-status
* objects so that we have at least half of them under
* NETWORKSTATUS_MAX_VALIDITY publication time. We want to download a new
* *one* if the most recent one's publication time is under
* NETWORKSTATUS_CLIENT_DL_INTERVAL.
*/
if (!trusted_dir_servers || !smartlist_len(trusted_dir_servers))
return;
n_dirservers = n_running_dirservers = smartlist_len(trusted_dir_servers);
SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds,
{
networkstatus_t *ns = networkstatus_get_by_digest(ds->digest);
if (!ns)
continue;
if (ds->n_networkstatus_failures > NETWORKSTATUS_N_ALLOWABLE_FAILURES) {
--n_running_dirservers;
continue;
}
if (ns->published_on > now-NETWORKSTATUS_MAX_VALIDITY)
++n_live;
if (!most_recent || ns->received_on > most_recent_received) {
most_recent_idx = ds_sl_idx; /* magic variable from FOREACH */
most_recent = ds;
most_recent_received = ns->received_on;
}
});
/* Download enough so we have at least half live, but no more than all the
* trusted dirservers we know.
*/
if (n_live < (n_dirservers/2)+1)
needed = (n_dirservers/2)+1-n_live;
if (needed > n_running_dirservers)
needed = n_running_dirservers;
if (needed)
/* XXXX001 Downgrade to info NM */
log_fn(LOG_NOTICE, "For %d/%d running directory servers, we have %d live"
" network-status documents. Downloading %d.",
n_running_dirservers, n_dirservers, n_live, needed);
/* Also, download at least 1 every NETWORKSTATUS_CLIENT_DL_INTERVAL. */
if (n_running_dirservers &&
most_recent_received < now-NETWORKSTATUS_CLIENT_DL_INTERVAL && needed < 1) {
log_fn(LOG_NOTICE, "Our most recent network-status document is %d"
" seconds old; downloading another.", (int)(now-most_recent_received));
needed = 1;
}
if (!needed)
return;
/* If no networkstatus was found, choose a dirserver at random as "most
* recent". */
if (most_recent_idx<0)
most_recent_idx = crypto_pseudo_rand_int(n_dirservers);
/* Build a request string for all the resources we want. */
resource_len = needed * (HEX_DIGEST_LEN+1) + 6;
resource = tor_malloc(resource_len);
memcpy(resource, "fp/", 3);
cp = resource+3;
for (i = most_recent_idx+1; needed; ++i) {
trusted_dir_server_t *ds;
if (i >= n_dirservers)
i = 0;
ds = smartlist_get(trusted_dir_servers, i);
if (ds->n_networkstatus_failures > NETWORKSTATUS_N_ALLOWABLE_FAILURES)
continue;
base16_encode(cp, HEX_DIGEST_LEN+1, ds->digest, DIGEST_LEN);
cp += HEX_DIGEST_LEN;
--needed;
if (needed)
*cp++ = '+';
}
memcpy(cp, ".z", 3);
directory_get_from_dirserver(DIR_PURPOSE_FETCH_NETWORKSTATUS, resource, 1);
tor_free(resource);
}
/** Ensure that our own routerinfo is at the front, and remove duplicates
* of our routerinfo.
*/
static void
router_normalize_routerlist(routerlist_t *rl)
{
int i=0;
routerinfo_t *r;
if ((r = router_get_my_routerinfo())) {
smartlist_insert(rl->routers, 0, routerinfo_copy(r));
++i;
}
for ( ; i < smartlist_len(rl->routers); ++i) {
r = smartlist_get(rl->routers,i);
if (router_is_me(r)) {
routerinfo_free(r);
smartlist_del_keeporder(rl->routers, i--);
}
}
}
/** Decide whether a given addr:port is definitely accepted,
* definitely rejected, probably accepted, or probably rejected by a
* given policy. If <b>addr</b> is 0, we don't know the IP of the
* target address. If <b>port</b> is 0, we don't know the port of the
* target address.
*
* For now, the algorithm is pretty simple: we look for definite and
* uncertain matches. The first definite match is what we guess; if
* it was preceded by no uncertain matches of the opposite policy,
* then the guess is definite; otherwise it is probable. (If we
* have a known addr and port, all matches are definite; if we have an
* unknown addr/port, any address/port ranges other than "all" are
* uncertain.)
*
* We could do better by assuming that some ranges never match typical
* addresses (127.0.0.1, and so on). But we'll try this for now.
*/
addr_policy_result_t
router_compare_addr_to_addr_policy(uint32_t addr, uint16_t port,
addr_policy_t *policy)
{
int maybe_reject = 0;
int maybe_accept = 0;
int match = 0;
int maybe = 0;
addr_policy_t *tmpe;
for (tmpe=policy; tmpe; tmpe=tmpe->next) {
maybe = 0;
if (!addr) {
/* Address is unknown. */
if ((port >= tmpe->prt_min && port <= tmpe->prt_max) ||
(!port && tmpe->prt_min<=1 && tmpe->prt_max>=65535)) {
/* 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 == ADDR_POLICY_REJECT)
maybe_reject = 1;
else
maybe_accept = 1;
}
if (match) {
if (tmpe->policy_type == ADDR_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_PROBABLY_ACCEPTED : ADDR_POLICY_ACCEPTED;
} else {
return maybe_accept ? ADDR_POLICY_PROBABLY_REJECTED : ADDR_POLICY_REJECTED;
}
}
}
/* accept all by default. */
return maybe_reject ? ADDR_POLICY_PROBABLY_ACCEPTED : ADDR_POLICY_ACCEPTED;
}
/** Return 1 if all running sufficiently-stable 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 need_uptime)
{
addr_policy_result_t r;
if (!routerlist) return 1;
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, router,
{
if (router->is_running &&
!router_is_unreliable(router, need_uptime, 0)) {
r = router_compare_addr_to_addr_policy(addr, port, router->exit_policy);
if (r != ADDR_POLICY_REJECTED && r != ADDR_POLICY_PROBABLY_REJECTED)
return 0; /* this one could be ok. good enough. */
}
});
return 1; /* all will reject. */
}
/**
* If <b>policy</b> implicitly allows connections to any port in the
* IP set <b>addr</b>/<b>mask</b>, then set *<b>policy_out</b> to the
* part of the policy that allows it, and return 1. Else return 0.
*
* A policy allows an IP:Port combination <em>implicitly</em> if
* it is included in a *: pattern, or in a fallback pattern.
*/
static int
policy_includes_addr_mask_implicitly(addr_policy_t *policy,
uint32_t addr, uint32_t mask,
addr_policy_t **policy_out)
{
uint32_t addr2;
tor_assert(policy_out);
addr &= mask;
addr2 = addr | ~mask;
for (; policy; policy=policy->next) {
/* Does this policy cover all of the address range we're looking at? */
/* Boolean logic time: range X is contained in range Y if, for
* each bit B, all possible values of B in X are values of B in Y.
* In "addr", we have every fixed bit set to its value, and every
* free bit set to 0. In "addr2", we have every fixed bit set to
* its value, and every free bit set to 1. So if addr and addr2 are
* both in the policy, the range is covered by the policy.
*/
uint32_t p_addr = policy->addr & policy->msk;
if (p_addr == (addr & policy->msk) &&
p_addr == (addr2 & policy->msk) &&
(policy->prt_min <= 1 && policy->prt_max == 65535)) {
return 0;
}
/* Does this policy cover some of the address range we're looking at? */
/* Boolean logic time: range X and range Y intersect if there is
* some z such that z & Xmask == Xaddr and z & Ymask == Yaddr.
* This is FALSE iff there is some bit b where Xmask == yMask == 1
* and Xaddr != Yaddr. So if X intersects with Y iff at every
* place where Xmask&Ymask==1, Xaddr == Yaddr, or equivalently,
* Xaddr&Xmask&Ymask == Yaddr&Xmask&Ymask.
*/
if ((policy->addr & policy->msk & mask) == (addr & policy->msk) &&
policy->policy_type == ADDR_POLICY_ACCEPT) {
*policy_out = policy;
return 1;
}
}
*policy_out = NULL;
return 1;
}
/** If <b>policy</b> implicitly allows connections to any port on
* 127.*, 192.168.*, etc, then warn (if <b>warn</b> is set) and return
* true. Else return false.
**/
int
exit_policy_implicitly_allows_local_networks(addr_policy_t *policy,
int warn)
{
addr_policy_t *p;
int r=0,i;
static struct {
uint32_t addr; uint32_t mask; const char *network;
} private_networks[] = {
{ 0x7f000000, 0xff000000, "localhost (127.0.0.0/8)" },
{ 0x0a000000, 0xff000000, "addresses in private network 10.0.0.0/8" },
{ 0xa9fe0000, 0xffff0000, "addresses in private network 169.254.0.0/16" },
{ 0xac100000, 0xfff00000, "addresses in private network 172.16.0.0/12" },
{ 0xc0a80000, 0xffff0000, "addresses in private network 192.168.0.0/16" },
{ 0,0,NULL},
};
for (i=0; private_networks[i].addr; ++i) {
p = NULL;
/* log_fn(LOG_INFO,"Checking network %s", private_networks[i].network); */
if (policy_includes_addr_mask_implicitly(
policy, private_networks[i].addr, private_networks[i].mask, &p)) {
if (warn)
log_fn(LOG_WARN, "Exit policy %s implicitly accepts %s",
p?p->string:"(default)",
private_networks[i].network);
r = 1;
}
}
return r;
}
/** 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_addr_policy(0, 0, router->exit_policy)
== ADDR_POLICY_REJECTED;
}
#if 0
/** Release all space held in <b>rr</b>. */
void
running_routers_free(running_routers_t *rr)
{
if (!rr)
return;
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>. */
static 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));
smartlist_free(all_routers);
list->running_routers_updated_on = rr->published_on;
}
/** We've just got a running routers list in <b>rr</b>; update the
* status of the routers in <b>list</b>, and cache <b>rr</b> */
void
routerlist_set_runningrouters(routerlist_t *list, running_routers_t *rr)
{
routerlist_update_from_runningrouters(list,rr);
if (list->running_routers != rr) {
running_routers_free(list->running_routers);
list->running_routers = rr;
}
}
/** 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 authdir = get_options()->AuthoritativeDir;
int is_running = 1;
int is_verified = 0, is_named = 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 != '$') {
/* It starts with a non-dollar character; that's a nickname. The nickname
* entry will either extend to a NUL (old running-routers format) or to an
* equals sign (new router-status format). */
is_verified = 1;
is_named = 1;
end = strchr(cp, '=');
if (!end)
end = strchr(cp,'\0');
tor_assert(end);
/* 'end' now points on character beyond the end of the nickname */
if (end == cp || end-cp > MAX_NICKNAME_LEN) {
log_fn(LOG_WARN, "Bad nickname length (%d) in router status entry (%s)",
(int)(end-cp), s);
return -1;
}
memcpy(nickname, cp, end-cp);
nickname[end-cp]='\0';
if (!is_legal_nickname(nickname)) {
log_fn(LOG_WARN, "Bad nickname (%s) in router status entry (%s)",
nickname, s);
return -1;
}
cp = end;
if (*cp == '=')
++cp;
}
/* 'end' now points to the start of a hex digest, or EOS. */
/* Parse the hexdigest portion of the status. */
if (*cp == '$') {
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 (!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 (!authdir) {
/* If we're not an authoritative directory, update verified status.
*/
if (nickname_matches && digest_matches)
r->is_verified = r->is_named = 1;
else if (digest_matches)
r->is_verified = r->is_named = 0;
}
if (digest_matches)
if (r->status_set_at < list_time) {
if (!authdir || is_running)
/* If we're an authoritative directory, only believe that servers
* are down when we hear it ourselves. Otherwise, believe
* what we're told.
*/
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)
{
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));
smartlist_free(rl);
return 0;
}
#endif
/** Add to the list of authorized directory servers one at
* <b>address</b>:<b>port</b>, with identity key <b>digest</b>. If
* <b>address</b> is NULL, add ourself. */
void
add_trusted_dir_server(const char *address, uint16_t port, const char *digest,
int supports_v1)
{
trusted_dir_server_t *ent;
uint32_t a;
char *hostname = NULL;
if (!trusted_dir_servers)
trusted_dir_servers = smartlist_create();
if (!address) { /* The address is us; we should guess. */
if (resolve_my_address(get_options(), &a, &hostname) < 0) {
log_fn(LOG_WARN, "Couldn't find a suitable address. Returning.");
return;
}
} else {
if (tor_lookup_hostname(address, &a)) {
log_fn(LOG_WARN, "Unable to lookup address for directory server at %s",
address);
return;
}
hostname = tor_strdup(address);
a = ntohl(a);
}
ent = tor_malloc_zero(sizeof(trusted_dir_server_t));
ent->address = hostname;
ent->addr = a;
ent->dir_port = port;
ent->is_running = 1;
ent->supports_v1_protocol = supports_v1;
memcpy(ent->digest, digest, DIGEST_LEN);
smartlist_add(trusted_dir_servers, ent);
}
/** Remove all members from the list of trusted dir servers. */
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();
}
}
/** Return the network status with a given identity digest. */
networkstatus_t *
networkstatus_get_by_digest(const char *digest)
{
SMARTLIST_FOREACH(networkstatus_list, networkstatus_t *, ns,
{
if (!memcmp(ns->identity_digest, digest, DIGEST_LEN))
return ns;
});
return NULL;
}
/** If the network-status list has changed since the last time we called this
* function, update the status of every router from the network-status list.
*/
void
routers_update_all_from_networkstatus(void)
{
static int have_warned_about_unverified_status = 0;
routerinfo_t *me;
if (!routerlist || !networkstatus_list || !networkstatus_list_has_changed)
return;
routers_update_status_from_networkstatus(routerlist->routers);
me = router_get_my_routerinfo();
if (me) {
/* We could be more sophisticated about this whole business. How many
* dirservers list us as named, valid, etc. */
smartlist_t *lst = smartlist_create();
smartlist_add(lst, me);
routers_update_status_from_networkstatus(lst);
if (me->is_verified == 0) {
log_fn(LOG_WARN, "Many directory servers list us as unverified. Please consider sending your identity fingerprint to the tor-ops.");
have_warned_about_unverified_status = 1;
} else if (me->is_named == 0) {
log_fn(LOG_WARN, "Many directory servers list us as unnamed. Please consider sending your identity fingerprint to the tor-ops.");
have_warned_about_unverified_status = 1;
}
}
helper_nodes_set_status_from_directory();
networkstatus_list_has_changed = 0;
}
/** Allow any network-status newer than this to influence our view of who's
* running. */
#define DEFAULT_RUNNING_INTERVAL 60*60
/** If possible, always allow at least this many network-statuses to influence
* our view of who's running. */
#define MIN_TO_INFLUENCE_RUNNING 3
/** Given a list <b>routers</b> of routerinfo_t *, update each routers's
* is_named, is_verified, and is_running fields according to our current
* networkstatus_t documents. */
void
routers_update_status_from_networkstatus(smartlist_t *routers)
{
int n_trusted, n_statuses, n_valid, n_naming, n_named, n_running, n_listing,
n_recent;
int i;
time_t now = time(NULL);
trusted_dir_server_t *ds;
if (authdir_mode(get_options())) {
/* An authoritative directory should never believer someone else about
* a server's status. */
return;
}
if (!networkstatus_list)
networkstatus_list = smartlist_create();
if (!trusted_dir_servers)
trusted_dir_servers = smartlist_create();
n_trusted = smartlist_len(trusted_dir_servers);
n_statuses = smartlist_len(networkstatus_list);
if (n_statuses < (n_trusted/2)+1) {
/* Not enough statuses to adjust status. */
return;
}
if (n_statuses < MIN_TO_INFLUENCE_RUNNING) {
n_recent = n_statuses;
} else {
n_recent = 0;
for (i=smartlist_len(networkstatus_list)-1; i >= 0; --i) {
networkstatus_t *ns = smartlist_get(networkstatus_list, i);
if (ns->published_on + DEFAULT_RUNNING_INTERVAL < now)
break;
++n_recent;
}
if (n_recent < MIN_TO_INFLUENCE_RUNNING) {
n_recent = MIN_TO_INFLUENCE_RUNNING;
}
}
SMARTLIST_FOREACH(routers, routerinfo_t *, router,
{
ds = router_get_trusteddirserver_by_digest(router->identity_digest);
n_listing = n_valid = n_naming = n_named = n_running = 0;
SMARTLIST_FOREACH(networkstatus_list, networkstatus_t *, ns,
{
routerstatus_t *rs = networkstatus_find_entry(ns, router->identity_digest);
if (ns->binds_names)
++n_naming;
if (!rs)
continue;
++n_listing;
if (rs->is_named && !strcasecmp(rs->nickname, router->nickname))
++n_named;
if (rs->is_valid)
++n_valid;
if (ns_sl_idx >= smartlist_len(networkstatus_list)-n_recent) {
if (rs->is_running)
++n_running;
}
});
log_fn(LOG_DEBUG, "Router '%s' at %s:%d is listed by %d/%d directories, "
"named by %d/%d, validated by %d/%d, and %d/%d recent directories "
"think it's running.",
router->nickname, router->address, router->or_port,
n_listing, n_statuses, n_named, n_naming, n_valid, n_statuses,
n_running, n_recent);
router->is_named = (n_named > n_naming/2);
router->is_verified = (n_valid > n_statuses/2);
router->is_running = (n_running > n_recent/2);
if (router->is_running && ds)
/*Hm. What about authorities? When do they reset n_networkstatus_failures?*/
ds->n_networkstatus_failures = 0;
});
}
/** Return new list of ID digests for superseded routers. A router is
* superseded if any network-status has a router with a different digest
* published more recently, or it it is listed in the network-status but not
* in the router list.
*/
smartlist_t *
router_list_superseded(void)
{
smartlist_t *superseded = smartlist_create();
strmap_t *most_recent = NULL;
char fp[HEX_DIGEST_LEN+1];
routerstatus_t *rs_old;
if (!routerlist || !networkstatus_list)
return superseded;
/* Build a map from fingerprint to most recent routerstatus_t. If this
* becomes inefficient, we can build most_recent lazily when a new
* networkstatus_t shows up.*/
most_recent = strmap_new();
SMARTLIST_FOREACH(networkstatus_list, networkstatus_t *, ns,
{
SMARTLIST_FOREACH(ns->entries, routerstatus_t *, rs,
{
base16_encode(fp, sizeof(fp), rs->identity_digest, DIGEST_LEN);
rs_old = strmap_get(most_recent, fp);
if (!rs_old || rs_old->published_on < rs->published_on)
strmap_set(most_recent, fp, rs);
});
});
/* Compare each router to the most recent routerstatus. */
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, ri,
{
routerstatus_t *rs;
base16_encode(fp, sizeof(fp), ri->identity_digest, DIGEST_LEN);
rs = strmap_get(most_recent, fp);
if (!rs)
continue;
if (memcmp(ri->signed_descriptor_digest,rs->descriptor_digest,DIGEST_LEN)
&& rs->published_on > ri->published_on) {
char *d = tor_malloc(DIGEST_LEN);
memcpy(d, ri->identity_digest, DIGEST_LEN);
smartlist_add(superseded, d);
break;
}
});
strmap_free(most_recent, NULL);
return superseded;
}
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