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a718fcb1c0
tor/src/or/networkstatus.c
Nick Mathewson a718fcb1c0 r15663@catbus: nickm | 2007-10-10 16:35:58 -0400 
Resolve some more voting-related XXXXs.


svn:r11860
2007-10-11 00:13:03 +00:00

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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2007, Roger Dingledine, Nick Mathewson. */
/* See LICENSE for licensing information */
/* $Id$ */
const char networkstatus_c_id[] =
"$Id$";
/**
* DOCDOC
*/
#include "or.h"
/** Global list of routerstatus_t for each router, known or unknown.
* Kept sorted by digest. */
static smartlist_t *routerstatus_list = NULL;
/** Map from descriptor digest to a member of routerstatus_list: used to
* update download status when a download fails. */
static digestmap_t *routerstatus_by_desc_digest_map = NULL;
/** True iff any element of routerstatus_list has changed since the last
* time we called routers_update_all_from_networkstatus().*/
static int routerstatus_list_has_changed = 0;
/** Map from lowercase nickname to digest of named server, if any. */
static strmap_t *named_server_map = NULL;
/** 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;
/** Most recently received and validated v3 consensus network status. */
static networkstatus_vote_t *current_consensus = NULL;
/** A v3 consensus networkstatus that we've received, but which we don't
* have enough certificates to be happy about. */
static networkstatus_vote_t *consensus_waiting_for_certs = NULL;
static char *consensus_waiting_for_certs_body = NULL;
/** True iff any member of networkstatus_list has changed since the last time
* we called routerstatus_list_update_from_networkstatus(). */
static int networkstatus_list_has_changed = 0;
/** The last time we tried to download a networkstatus, or 0 for "never". We
* use this to rate-limit download attempts for directory caches (including
* mirrors). Clients don't use this now. */
static time_t last_networkstatus_download_attempted = 0;
/**DOCDOC*/
static time_t time_to_download_next_consensus = 0;
/**DOCDOC*/
static download_status_t consensus_dl_status = { 0, 0};
/** List of strings for nicknames or fingerprints we've already warned about
* and that are still conflicted. */ /*XXXX020 obsoleted by v3 dirs? */
static smartlist_t *warned_conflicts = NULL;
/** True iff we have logged a warning about this OR not being valid or
* not being named. */
static int have_warned_about_invalid_status = 0;
/** True iff we have logged a warning about this OR's version being older than
* listed by the authorities */
static int have_warned_about_old_version = 0;
/** True iff we have logged a warning about this OR's version being newer than
* listed by the authorities */
static int have_warned_about_new_version = 0;
static int have_tried_downloading_all_statuses(int n_failures);
/** DOCDOC */
void
networkstatus_reset_warnings(void)
{
if (!routerstatus_list)
routerstatus_list = smartlist_create();
SMARTLIST_FOREACH(routerstatus_list, routerstatus_t *, rs,
rs->name_lookup_warned = 0);
if (!warned_conflicts)
warned_conflicts = smartlist_create();
SMARTLIST_FOREACH(warned_conflicts, char *, cp, tor_free(cp));
smartlist_clear(warned_conflicts); /* now the list is empty. */
have_warned_about_invalid_status = 0;
have_warned_about_old_version = 0;
have_warned_about_new_version = 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];
smartlist_t *entries;
struct stat st;
char *s;
tor_assert(get_options()->DataDirectory);
if (!networkstatus_list)
networkstatus_list = smartlist_create();
tor_snprintf(filename,sizeof(filename),"%s"PATH_SEPARATOR"cached-status",
get_options()->DataDirectory);
entries = tor_listdir(filename);
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_info(LD_DIR,
"Skipping cached-status file with unexpected name \"%s\"",fn);
continue;
}
tor_snprintf(filename,sizeof(filename),
"%s"PATH_SEPARATOR"cached-status"PATH_SEPARATOR"%s",
get_options()->DataDirectory, fn);
s = read_file_to_str(filename, 0, &st);
if (s) {
if (router_set_networkstatus(s, st.st_mtime, NS_FROM_CACHE, NULL)<0) {
log_warn(LD_FS, "Couldn't load networkstatus from \"%s\"",filename);
}
tor_free(s);
}
});
SMARTLIST_FOREACH(entries, char *, fn, tor_free(fn));
smartlist_free(entries);
networkstatus_list_clean(time(NULL));
routers_update_all_from_networkstatus(time(NULL));
return 0;
}
/** Read the cached v3 consensus networkstatus from the disk. */
int
router_reload_consensus_networkstatus(void)
{
char filename[512];
char *s;
/* XXXX020 Suppress warnings if cached consensus is bad. */
tor_snprintf(filename,sizeof(filename),"%s"PATH_SEPARATOR"cached-consensus",
get_options()->DataDirectory);
s = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL);
if (s) {
if (networkstatus_set_current_consensus(s, 1, 0)) {
log_warn(LD_FS, "Couldn't load consensus networkstatus from \"%s\"",
filename);
}
tor_free(s);
}
tor_snprintf(filename,sizeof(filename),
"%s"PATH_SEPARATOR"unverified-consensus",
get_options()->DataDirectory);
s = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL);
if (s) {
if (networkstatus_set_current_consensus(s, 1, 1)) {
log_warn(LD_FS, "Couldn't load consensus networkstatus from \"%s\"",
filename);
}
tor_free(s);
}
return 0;
}
/** 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);
}
/** Helper: return a newly allocated string containing the name of the filename
* where we plan to cache the network status with the given identity digest. */
char *
networkstatus_get_cache_filename(const char *identity_digest)
{
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, identity_digest, DIGEST_LEN);
tor_snprintf(fn, len, "%s"PATH_SEPARATOR"cached-status"PATH_SEPARATOR"%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;
}
/** Add the parsed neworkstatus in <b>ns</b> (with original document in
* <b>s</b>) to the disk cache (and the in-memory directory server cache) as
* appropriate. */
static int
add_networkstatus_to_cache(const char *s,
networkstatus_source_t source,
networkstatus_t *ns)
{
if (source != NS_FROM_CACHE) {
char *fn = networkstatus_get_cache_filename(ns->identity_digest);
if (write_str_to_file(fn, s, 0)<0) {
log_notice(LD_FS, "Couldn't write cached network status to \"%s\"", fn);
}
tor_free(fn);
}
if (dirserver_mode(get_options()))
dirserv_set_cached_networkstatus_v2(s,
ns->identity_digest,
ns->published_on);
return 0;
}
/** How far in the future do we allow a network-status to get before removing
* it? (seconds) */
#define NETWORKSTATUS_ALLOW_SKEW (24*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 as necessary.
*
* If <b>source</b> is NS_FROM_DIR or NS_FROM_CACHE, do not replace our
* own networkstatus_t (if we're an authoritative 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.
*
* Callers should make sure that routers_update_all_from_networkstatus() is
* invoked after this function succeeds.
*/
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 = NULL;
const char *source_desc = NULL;
char fp[HEX_DIGEST_LEN+1];
char published[ISO_TIME_LEN+1];
ns = networkstatus_parse_from_string(s);
if (!ns) {
log_warn(LD_DIR, "Couldn't parse network status.");
return -1;
}
base16_encode(fp, HEX_DIGEST_LEN+1, ns->identity_digest, DIGEST_LEN);
if (!(trusted_dir =
router_get_trusteddirserver_by_digest(ns->identity_digest)) ||
!(trusted_dir->type & V2_AUTHORITY)) {
log_info(LD_DIR, "Network status was signed, but not by an authoritative "
"directory we recognize.");
if (!dirserver_mode(get_options())) {
networkstatus_free(ns);
return 0;
}
source_desc = fp;
} else {
source_desc = trusted_dir->description;
}
now = time(NULL);
if (arrived_at > now)
arrived_at = now;
ns->received_on = arrived_at;
format_iso_time(published, ns->published_on);
if (ns->published_on > now + NETWORKSTATUS_ALLOW_SKEW) {
log_warn(LD_GENERAL, "Network status from %s was published in the future "
"(%s GMT). Check your system clock! "
"Not caching.",
source_desc, published);
control_event_general_status(LOG_WARN,
"CLOCK_SKEW SOURCE=NETWORKSTATUS:%s:%d",
ns->source_address, ns->source_dirport);
skewed = 1;
}
if (!networkstatus_list)
networkstatus_list = smartlist_create();
if ( (source == NS_FROM_DIR_BY_FP || source == NS_FROM_DIR_ALL) &&
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;
}
if (requested_fingerprints) {
if (smartlist_string_isin(requested_fingerprints, fp)) {
smartlist_string_remove(requested_fingerprints, fp);
} else {
if (source != NS_FROM_DIR_ALL) {
char *requested =
smartlist_join_strings(requested_fingerprints," ",0,NULL);
log_warn(LD_DIR,
"We received a network status with a fingerprint (%s) that we "
"never requested. (We asked for: %s.) Dropping.",
fp, requested);
tor_free(requested);
return 0;
}
}
}
if (!trusted_dir) {
if (!skewed && dirserver_mode(get_options())) {
/* We got a non-trusted networkstatus, and we're a directory cache.
* This means that we asked an authority, and it told us about another
* authority we didn't recognize. */
log_info(LD_DIR,
"We do not recognize authority (%s) but we are willing "
"to cache it.", fp);
add_networkstatus_to_cache(s, source, ns);
networkstatus_free(ns);
}
return 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);
tor_assert(trusted_dir);
log_info(LD_DIR,
"Not replacing network-status from %s (published %s); "
"we already have it.",
trusted_dir->description, published);
if (old_ns->received_on < arrived_at) {
if (source != NS_FROM_CACHE) {
char *fn;
fn = networkstatus_get_cache_filename(old_ns->identity_digest);
/* We use mtime to tell when it arrived, so update that. */
touch_file(fn);
tor_free(fn);
}
old_ns->received_on = arrived_at;
}
download_status_failed(&trusted_dir->v2_ns_dl_status, 0);
return 0;
} else if (old_ns->published_on >= ns->published_on) {
char old_published[ISO_TIME_LEN+1];
format_iso_time(old_published, old_ns->published_on);
tor_assert(trusted_dir);
log_info(LD_DIR,
"Not replacing network-status from %s (published %s);"
" we have a newer one (published %s) for this authority.",
trusted_dir->description, published,
old_published);
networkstatus_free(ns);
download_status_failed(&trusted_dir->v2_ns_dl_status, 0);
return 0;
} else {
networkstatus_free(old_ns);
smartlist_set(networkstatus_list, i, ns);
found = 1;
break;
}
}
}
if (source != NS_FROM_CACHE && trusted_dir) {
download_status_reset(&trusted_dir->v2_ns_dl_status);
}
if (!found)
smartlist_add(networkstatus_list, ns);
SMARTLIST_FOREACH(ns->entries, routerstatus_t *, rs,
{
if (!router_get_by_descriptor_digest(rs->descriptor_digest))
rs->need_to_mirror = 1;
});
log_info(LD_DIR, "Setting networkstatus %s %s (published %s)",
source == NS_FROM_CACHE?"cached from":
((source == NS_FROM_DIR_BY_FP || source == NS_FROM_DIR_ALL) ?
"downloaded from":"generated for"),
trusted_dir->description, published);
networkstatus_list_has_changed = 1;
router_dir_info_changed();
smartlist_sort(networkstatus_list, _compare_networkstatus_published_on);
if (!skewed)
add_networkstatus_to_cache(s, source, ns);
networkstatus_list_update_recent(now);
return 0;
}
/** 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->identity_digest);
if (file_status(fname) == FN_FILE) {
log_info(LD_DIR, "Removing too-old networkstatus in %s", fname);
unlink(fname);
}
tor_free(fname);
if (dirserver_mode(get_options())) {
dirserv_set_cached_networkstatus_v2(NULL, ns->identity_digest, 0);
}
networkstatus_free(ns);
router_dir_info_changed();
}
/* And now go through the directory cache for any cached untrusted
* networkstatuses and other network info. */
dirserv_clear_old_networkstatuses(now - MAX_NETWORKSTATUS_AGE);
dirserv_clear_old_v1_info(now);
}
/** 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);
}
/** DOCDOC */
const smartlist_t *
networkstatus_get_v2_list(void)
{
if (!networkstatus_list)
networkstatus_list = smartlist_create();
return networkstatus_list;
}
/** DOCDOC list of routerstatus_t */
const smartlist_t *
networkstatus_get_all_statuses(void)
{
if (!routerstatus_list)
routerstatus_list = smartlist_create();
return routerstatus_list;
}
/** Return the consensus view of the status of the router whose identity
* digest is <b>digest</b>, or NULL if we don't know about any such router. */
routerstatus_t *
router_get_combined_status_by_digest(const char *digest)
{
if (!routerstatus_list)
return NULL;
return smartlist_bsearch(routerstatus_list, digest,
_compare_digest_to_routerstatus_entry);
}
/** Return the consensus view of the status of the router whose current
* <i>descriptor</i> digest is <b>digest</b>, or NULL if no such router is
* known. */
routerstatus_t *
router_get_combined_status_by_descriptor_digest(const char *digest)
{
if (!routerstatus_by_desc_digest_map)
return NULL;
return digestmap_get(routerstatus_by_desc_digest_map, digest);
}
/** Given a nickname (possibly verbose, possibly a hexadecimal digest), return
* the corresponding routerstatus_t, or NULL if none exists. Warn the
* user if <b>warn_if_unnamed</b> is set, and they have specified a router by
* nickname, but the Named flag isn't set for that router. */
routerstatus_t *
router_get_combined_status_by_nickname(const char *nickname,
int warn_if_unnamed)
{
char digest[DIGEST_LEN];
routerstatus_t *best=NULL;
smartlist_t *matches=NULL;
if (!routerstatus_list || !nickname)
return NULL;
if (nickname[0] == '$') {
if (base16_decode(digest, DIGEST_LEN, nickname+1, strlen(nickname))<0)
return NULL;
return router_get_combined_status_by_digest(digest);
} else if (strlen(nickname) == HEX_DIGEST_LEN &&
(base16_decode(digest, DIGEST_LEN, nickname+1, strlen(nickname))==0)) {
return router_get_combined_status_by_digest(digest);
}
matches = smartlist_create();
SMARTLIST_FOREACH(routerstatus_list, routerstatus_t *, lrs,
{
if (!strcasecmp(lrs->nickname, nickname)) {
if (lrs->is_named) {
smartlist_free(matches);
return lrs;
} else {
smartlist_add(matches, lrs);
best = lrs;
}
}
});
if (smartlist_len(matches)>1 && warn_if_unnamed) {
int any_unwarned=0;
SMARTLIST_FOREACH(matches, routerstatus_t *, lrs,
{
if (! lrs->name_lookup_warned) {
lrs->name_lookup_warned=1;
any_unwarned=1;
}
});
if (any_unwarned) {
log_warn(LD_CONFIG,"There are multiple matches for the nickname \"%s\","
" but none is listed as named by the directory authorites. "
"Choosing one arbitrarily.", nickname);
}
} else if (warn_if_unnamed && best && !best->name_lookup_warned) {
char fp[HEX_DIGEST_LEN+1];
base16_encode(fp, sizeof(fp),
best->identity_digest, DIGEST_LEN);
log_warn(LD_CONFIG,
"When looking up a status, you specified a server \"%s\" by name, "
"but the directory authorities do not have any key registered for "
"this nickname -- so it could be used by any server, "
"not just the one you meant. "
"To make sure you get the same server in the future, refer to "
"it by key, as \"$%s\".", nickname, fp);
best->name_lookup_warned = 1;
}
smartlist_free(matches);
return best;
}
/** DOCDOC */
const char *
networkstatus_get_router_digest_by_nickname(const char *nickname)
{
if (!named_server_map)
return NULL;
return strmap_get_lc(named_server_map, nickname);
}
#if 0
/** Find a routerstatus_t that corresponds to <b>hexdigest</b>, if
* any. Prefer ones that belong to authorities. */
routerstatus_t *
routerstatus_get_by_hexdigest(const char *hexdigest)
{
char digest[DIGEST_LEN];
routerstatus_t *rs;
trusted_dir_server_t *ds;
if (strlen(hexdigest) < HEX_DIGEST_LEN ||
base16_decode(digest,DIGEST_LEN,hexdigest,HEX_DIGEST_LEN) < 0)
return NULL;
if ((ds = router_get_trusteddirserver_by_digest(digest)))
return &ds->fake_status;
if ((rs = router_get_combined_status_by_digest(digest)))
return rs;
return NULL;
}
#endif
/** How frequently do directory authorities re-download fresh networkstatus
* documents? */
#define AUTHORITY_NS_CACHE_INTERVAL (5*60)
/** How frequently do non-authority directory caches re-download fresh
* networkstatus documents? */
#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 v2 authorities,
* this means asking each trusted directory for its network-status.
* For caches, this means asking a random v2 authority for all
* network-statuses.
*/
static void
update_v2_networkstatus_cache_downloads(time_t now)
{
int authority = authdir_mode_v2(get_options());
int interval =
authority ? AUTHORITY_NS_CACHE_INTERVAL : NONAUTHORITY_NS_CACHE_INTERVAL;
const smartlist_t *trusted_dir_servers = router_get_trusted_dir_servers();
if (last_networkstatus_download_attempted + interval >= now)
return;
last_networkstatus_download_attempted = 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]; /* fp/hexdigit.z\0 */
if (!(ds->type & V2_AUTHORITY))
continue;
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)) {
/* XXX020 the above dir_port won't be accurate if we're
* doing a tunneled conn. In that case it should be or_port.
* How to guess from here? Maybe make the function less general
* and have it know that it's looking for dir conns. -RD */
/* 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_initiate_command_routerstatus(
&ds->fake_status, DIR_PURPOSE_FETCH_NETWORKSTATUS,
ROUTER_PURPOSE_GENERAL,
0, /* Not private */
resource,
NULL, 0 /* No payload. */);
});
} 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,
ROUTER_PURPOSE_GENERAL, "all.z",1);
}
}
/** 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.
*/
static void
update_v2_networkstatus_client_downloads(time_t now)
{
int n_live = 0, n_dirservers, n_running_dirservers, needed = 0;
int fetch_latest = 0;
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;
smartlist_t *missing;
const smartlist_t *trusted_dir_servers = router_get_trusted_dir_servers();
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 all of them under
* NETWORKSTATUS_MAX_AGE publication time. We want to download a new
* *one* if the most recent one's publication time is under
* NETWORKSTATUS_CLIENT_DL_INTERVAL.
*/
if (!get_n_authorities(V2_AUTHORITY))
return;
n_dirservers = n_running_dirservers = 0;
missing = smartlist_create();
SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds,
{
networkstatus_t *ns = networkstatus_get_by_digest(ds->digest);
if (!(ds->type & V2_AUTHORITY))
continue;
++n_dirservers;
if (!download_status_is_ready(&ds->v2_ns_dl_status, now,
NETWORKSTATUS_N_ALLOWABLE_FAILURES))
continue;
++n_running_dirservers;
if (ns && ns->published_on > now-NETWORKSTATUS_MAX_AGE)
++n_live;
else
smartlist_add(missing, ds->digest);
if (ns && (!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;
}
});
/* Also, download at least 1 every NETWORKSTATUS_CLIENT_DL_INTERVAL. */
if (!smartlist_len(missing) &&
most_recent_received < now-NETWORKSTATUS_CLIENT_DL_INTERVAL) {
log_info(LD_DIR, "Our most recent network-status document (from %s) "
"is %d seconds old; downloading another.",
most_recent?most_recent->description:"nobody",
(int)(now-most_recent_received));
fetch_latest = 1;
needed = 1;
} else if (smartlist_len(missing)) {
log_info(LD_DIR, "For %d/%d running directory servers, we have %d live"
" network-status documents. Downloading %d.",
n_running_dirservers, n_dirservers, n_live,
smartlist_len(missing));
needed = smartlist_len(missing);
} else {
smartlist_free(missing);
return;
}
/* If no networkstatus was found, choose a dirserver at random as "most
* recent". */
if (most_recent_idx<0)
most_recent_idx = crypto_rand_int(smartlist_len(trusted_dir_servers));
if (fetch_latest) {
int i;
int n_failed = 0;
for (i = most_recent_idx + 1; 1; ++i) {
trusted_dir_server_t *ds;
if (i >= smartlist_len(trusted_dir_servers))
i = 0;
ds = smartlist_get(trusted_dir_servers, i);
if (!(ds->type & V2_AUTHORITY))
continue;
if (n_failed >= n_dirservers) {
log_info(LD_DIR, "All authorities have failed. Not trying any.");
smartlist_free(missing);
return;
}
if (ds->v2_ns_dl_status.n_download_failures >
NETWORKSTATUS_N_ALLOWABLE_FAILURES) {
++n_failed;
continue;
}
smartlist_add(missing, ds->digest);
break;
}
}
/* Build a request string for all the resources we want. */
resource_len = smartlist_len(missing) * (HEX_DIGEST_LEN+1) + 6;
resource = tor_malloc(resource_len);
memcpy(resource, "fp/", 3);
cp = resource+3;
smartlist_sort_digests(missing);
needed = smartlist_len(missing);
SMARTLIST_FOREACH(missing, const char *, d,
{
base16_encode(cp, HEX_DIGEST_LEN+1, d, DIGEST_LEN);
cp += HEX_DIGEST_LEN;
--needed;
if (needed)
*cp++ = '+';
});
memcpy(cp, ".z", 3);
directory_get_from_dirserver(DIR_PURPOSE_FETCH_NETWORKSTATUS,
ROUTER_PURPOSE_GENERAL, resource, 1);
tor_free(resource);
smartlist_free(missing);
}
/** DOCDOC */
static void
update_consensus_networkstatus_downloads(time_t now)
{
or_options_t *options = get_options();
if (!options->DirPort) /*XXXX020 remove this. */
return;
if (time_to_download_next_consensus > now)
return;
if (authdir_mode_v3(options))
return;
if (!download_status_is_ready(&consensus_dl_status, now, 8))
return; /*XXXX020 magic number 8.*/
if (connection_get_by_type_purpose(CONN_TYPE_DIR,
DIR_PURPOSE_FETCH_CONSENSUS))
return;
directory_get_from_dirserver(DIR_PURPOSE_FETCH_CONSENSUS,
ROUTER_PURPOSE_GENERAL, NULL, 1);
}
/** DOCDOC */
void
networkstatus_consensus_download_failed(int status_code)
{
download_status_failed(&consensus_dl_status, status_code);
}
/** DOCDOC */
static void
update_consensus_networkstatus_fetch_time(time_t now)
{
or_options_t *options = get_options();
/* XXXX020 call this when DirPort switches on or off. NMNM */
if (current_consensus) {
const networkstatus_vote_t *c = current_consensus;
time_t start;
long interval;
if (dirserver_mode(options)) {
start = c->valid_after + 120; /*XXXX020 make this a macro. */
/* XXXX020 too much magic. */
interval = (c->fresh_until - c->valid_after) / 2;
} else {
start = c->fresh_until;
/* XXXX020 too much magic. */
interval = (c->valid_until - c->fresh_until) * 7 / 8;
}
if (interval < 1)
interval = 1;
tor_assert(start+interval < c->valid_until);
time_to_download_next_consensus = start + crypto_rand_int(interval);
} else {
time_to_download_next_consensus = now;
}
}
/** Return 1 if there's a reason we shouldn't try any directory
* fetches yet (e.g. we demand bridges and none are yet known).
* Else return 0. */
int
should_delay_dir_fetches(or_options_t *options)
{
if (options->UseBridges && !any_bridge_descriptors_known()) {
log_info(LD_DIR, "delaying dir fetches");
return 1;
}
return 0;
}
/** Launch requests for networkstatus documents and authority certificates as
* appropriate. */
void
update_networkstatus_downloads(time_t now)
{
or_options_t *options = get_options();
if (should_delay_dir_fetches(options))
return;
if (dirserver_mode(options))
update_v2_networkstatus_cache_downloads(now);
else
update_v2_networkstatus_client_downloads(now);
update_consensus_networkstatus_downloads(now);
if (consensus_waiting_for_certs)
authority_certs_fetch_missing(consensus_waiting_for_certs, now);
else
authority_certs_fetch_missing(current_consensus, now);
}
/** 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;
}
/** Return the most recent consensus that we have downloaded, or NULL if we
* don't have one. */
networkstatus_vote_t *
networkstatus_get_latest_consensus(void)
{
return current_consensus;
}
/** Return the most recent consensus that we have downloaded, or NULL if it is
* no longer live. */
networkstatus_vote_t *
networkstatus_get_live_consensus(time_t now)
{
if (current_consensus &&
current_consensus->valid_after <= now &&
now <= current_consensus->valid_until)
return current_consensus;
else
return NULL;
}
/** Try to replace the current cached v3 networkstatus with the one in
* <b>consensus</b>. If we don't have enough certificates to validate it,
* store it in consensus_waiting_for_certs and launch a certificate fetch.
*
* Return 0 on success, -1 on failure. */
int
networkstatus_set_current_consensus(const char *consensus, int from_cache,
int was_waiting_for_certs)
{
networkstatus_vote_t *c;
int r;
time_t now = time(NULL);
/* Make sure it's parseable. */
c = networkstatus_parse_vote_from_string(consensus, NULL, 0);
if (!c) {
log_warn(LD_DIR, "Unable to parse networkstatus consensus");
return -1;
}
/* Make sure it's signed enough. */
if ((r=networkstatus_check_consensus_signature(c, 1))<0) {
if (r == -1 && !was_waiting_for_certs) {
/* Okay, so it _might_ be signed enough if we get more certificates. */
if (!was_waiting_for_certs)
log_notice(LD_DIR, "Not enough certificates to check networkstatus "
"consensus");
if (!current_consensus ||
c->valid_after > current_consensus->valid_after) {
if (consensus_waiting_for_certs)
networkstatus_vote_free(consensus_waiting_for_certs);
tor_free(consensus_waiting_for_certs_body);
consensus_waiting_for_certs = c;
consensus_waiting_for_certs_body = tor_strdup(consensus);
/*XXXX020 delay next update. NMNM */
if (!from_cache) {
or_options_t *options = get_options();
char filename[512];
tor_snprintf(filename, sizeof(filename),
"%s"PATH_SEPARATOR"unverified-consensus",
options->DataDirectory);
write_str_to_file(filename, consensus, 0);
}
authority_certs_fetch_missing(c, now);
}
download_status_reset(&consensus_dl_status); /*XXXX020 not quite right.*/
return 0;
} else {
if (!was_waiting_for_certs)
log_warn(LD_DIR, "Not enough good signatures on networkstatus "
"consensus");
networkstatus_vote_free(c);
return -1;
}
}
download_status_reset(&consensus_dl_status); /*XXXX020 not quite right.*/
/* Are we missing any certificates at all? */
if (r != 1)
authority_certs_fetch_missing(c, now);
if (current_consensus)
networkstatus_vote_free(current_consensus);
if (consensus_waiting_for_certs &&
consensus_waiting_for_certs->valid_after <= c->valid_after) {
networkstatus_vote_free(consensus_waiting_for_certs);
consensus_waiting_for_certs = NULL;
if (consensus != consensus_waiting_for_certs_body)
tor_free(consensus_waiting_for_certs_body);
}
current_consensus = c;
update_consensus_networkstatus_fetch_time(now);
dirvote_recalculate_timing(now);
if (!from_cache) {
or_options_t *options = get_options();
char filename[512];
tor_snprintf(filename, sizeof(filename),
"%s"PATH_SEPARATOR"cached-consensus",
options->DataDirectory);
write_str_to_file(filename, consensus, 0);
}
if (dirserver_mode(get_options()))
dirserv_set_cached_networkstatus_v3(consensus, c->valid_after);
return 0;
}
/** DOCDOC */
void
networkstatus_note_certs_arrived(void)
{
if (consensus_waiting_for_certs) {
if (networkstatus_check_consensus_signature(
consensus_waiting_for_certs, 0)<0) {
if (!networkstatus_set_current_consensus(
consensus_waiting_for_certs_body, 0, 1)) {
tor_free(consensus_waiting_for_certs_body);
}
}
}
}
/** How many times do we have to fail at getting a networkstatus we can't find
* before we're willing to believe it's okay to set up router statuses? */
#define N_NS_ATTEMPTS_TO_SET_ROUTERS 4
/** How many times do we have to fail at getting a networkstatus we can't find
* before we're willing to believe it's okay to check our version? */
#define N_NS_ATTEMPTS_TO_CHECK_VERSION 4
/** We believe networkstatuses more recent than this when they tell us that
* our server is broken, invalid, obsolete, etc. */
#define SELF_OPINION_INTERVAL (90*60)
/** If the network-status list has changed since the last time we called this
* function, update the status of every routerinfo from the network-status
* list.
*/
void
routers_update_all_from_networkstatus(time_t now)
{
routerinfo_t *me;
routerlist_t *rl = router_get_routerlist();
if (!networkstatus_list ||
(!networkstatus_list_has_changed && !routerstatus_list_has_changed))
return;
router_dir_info_changed();
if (networkstatus_list_has_changed)
routerstatus_list_update_from_networkstatus(now);
routers_update_status_from_networkstatus(rl->routers, 0);
me = router_get_my_routerinfo();
if (me && !have_warned_about_invalid_status &&
have_tried_downloading_all_statuses(N_NS_ATTEMPTS_TO_SET_ROUTERS)) {
int n_recent = 0, n_listing = 0, n_valid = 0, n_named = 0, n_naming = 0;
routerstatus_t *rs;
SMARTLIST_FOREACH(networkstatus_list, networkstatus_t *, ns,
{
if (ns->received_on + SELF_OPINION_INTERVAL < now)
continue;
++n_recent;
if (ns->binds_names)
++n_naming;
if (!(rs = networkstatus_find_entry(ns, me->cache_info.identity_digest)))
continue;
++n_listing;
if (rs->is_valid)
++n_valid;
if (rs->is_named)
++n_named;
});
if (n_listing) {
if (n_valid <= n_listing/2) {
log_info(LD_GENERAL,
"%d/%d recent statements from directory authorities list us "
"as unapproved. Are you misconfigured?",
n_listing-n_valid, n_listing);
have_warned_about_invalid_status = 1;
} else if (n_naming && !n_named) {
log_info(LD_GENERAL, "0/%d name-binding directory authorities "
"recognize your nickname. Please consider sending your "
"nickname and identity fingerprint to the tor-ops.",
n_naming);
have_warned_about_invalid_status = 1;
}
}
}
entry_guards_compute_status();
if (!have_warned_about_old_version &&
have_tried_downloading_all_statuses(N_NS_ATTEMPTS_TO_CHECK_VERSION)) {
combined_version_status_t st;
int is_server = server_mode(get_options());
char *recommended;
recommended = compute_recommended_versions(now, !is_server, VERSION, &st);
if (st.n_versioning) {
if (st.consensus == VS_RECOMMENDED) {
log_info(LD_GENERAL, "%d/%d statements from version-listing "
"directory authorities say my version is ok.",
st.n_concurring, st.n_versioning);
} else if (st.consensus == VS_NEW || st.consensus == VS_NEW_IN_SERIES) {
if (!have_warned_about_new_version) {
log_notice(LD_GENERAL, "This version of Tor (%s) is newer than any "
"recommended version%s, according to %d/%d version-listing "
"network statuses. Versions recommended by more than %d "
"authorit%s are: %s",
VERSION,
st.consensus == VS_NEW_IN_SERIES ? " in its series" : "",
st.n_concurring, st.n_versioning, st.n_versioning/2,
st.n_versioning/2 > 1 ? "ies" : "y", recommended);
have_warned_about_new_version = 1;
control_event_general_status(LOG_WARN, "DANGEROUS_VERSION "
"CURRENT=%s REASON=%s RECOMMENDED=\"%s\"",
VERSION, "NEW", recommended);
}
} else {
log_warn(LD_GENERAL, "Please upgrade! "
"This version of Tor (%s) is %s, according to %d/%d version-"
"listing network statuses. Versions recommended by "
"at least %d authorit%s are: %s",
VERSION,
st.consensus == VS_OLD ? "obsolete" : "not recommended",
st.n_concurring, st.n_versioning, st.n_versioning/2,
st.n_versioning/2 > 1 ? "ies" : "y", recommended);
have_warned_about_old_version = 1;
control_event_general_status(LOG_WARN, "DANGEROUS_VERSION "
"CURRENT=%s REASON=%s RECOMMENDED=\"%s\"",
VERSION, st.consensus == VS_OLD ? "OLD" : "UNRECOMMENDED",
recommended);
}
}
tor_free(recommended);
}
routerstatus_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
/** Change the is_recent field of each member of networkstatus_list so that
* all members more recent than DEFAULT_RUNNING_INTERVAL are recent, and
* at least the MIN_TO_INFLUENCE_RUNNING most recent members are recent, and no
* others are recent. Set networkstatus_list_has_changed if anything happened.
*/
void
networkstatus_list_update_recent(time_t now)
{
int n_statuses, n_recent, changed, i;
char published[ISO_TIME_LEN+1];
if (!networkstatus_list)
return;
n_statuses = smartlist_len(networkstatus_list);
n_recent = 0;
changed = 0;
for (i=n_statuses-1; i >= 0; --i) {
networkstatus_t *ns = smartlist_get(networkstatus_list, i);
trusted_dir_server_t *ds =
router_get_trusteddirserver_by_digest(ns->identity_digest);
const char *src = ds?ds->description:ns->source_address;
if (n_recent < MIN_TO_INFLUENCE_RUNNING ||
ns->published_on + DEFAULT_RUNNING_INTERVAL > now) {
if (!ns->is_recent) {
format_iso_time(published, ns->published_on);
log_info(LD_DIR,
"Networkstatus from %s (published %s) is now \"recent\"",
src, published);
changed = 1;
}
ns->is_recent = 1;
++n_recent;
} else {
if (ns->is_recent) {
format_iso_time(published, ns->published_on);
log_info(LD_DIR,
"Networkstatus from %s (published %s) is "
"no longer \"recent\"",
src, published);
changed = 1;
ns->is_recent = 0;
}
}
}
if (changed) {
networkstatus_list_has_changed = 1;
router_dir_info_changed();
}
}
/** Helper for routerstatus_list_update_from_networkstatus: remember how many
* authorities recommend a given descriptor digest. */
typedef struct {
routerstatus_t *rs;
int count;
} desc_digest_count_t;
/** Update our view of router status (as stored in routerstatus_list) from the
* current set of network status documents (as stored in networkstatus_list).
* Do nothing unless the network status list has changed since the last time
* this function was called.
*/
void
routerstatus_list_update_from_networkstatus(time_t now)
{
or_options_t *options = get_options();
int n_trusted, n_statuses, n_recent = 0, n_naming = 0;
int n_listing_bad_exits = 0, n_listing_bad_directories = 0;
int i, j, warned;
int *index, *size;
networkstatus_t **networkstatus;
smartlist_t *result, *changed_list;
strmap_t *name_map;
char conflict[DIGEST_LEN]; /* Sentinel value */
desc_digest_count_t *digest_counts = NULL;
/* compute which network statuses will have a vote now */
networkstatus_list_update_recent(now);
router_dir_info_changed();
if (!networkstatus_list_has_changed)
return;
if (!networkstatus_list)
networkstatus_list = smartlist_create();
if (!routerstatus_list)
routerstatus_list = smartlist_create();
if (!warned_conflicts)
warned_conflicts = smartlist_create();
n_statuses = smartlist_len(networkstatus_list);
n_trusted = get_n_authorities(V2_AUTHORITY);
if (n_statuses <= n_trusted/2) {
/* Not enough statuses to adjust status. */
log_info(LD_DIR,
"Not enough statuses to update router status list. (%d/%d)",
n_statuses, n_trusted);
return;
}
log_info(LD_DIR, "Rebuilding router status list.");
index = tor_malloc(sizeof(int)*n_statuses);
size = tor_malloc(sizeof(int)*n_statuses);
networkstatus = tor_malloc(sizeof(networkstatus_t *)*n_statuses);
for (i = 0; i < n_statuses; ++i) {
index[i] = 0;
networkstatus[i] = smartlist_get(networkstatus_list, i);
size[i] = smartlist_len(networkstatus[i]->entries);
if (networkstatus[i]->binds_names)
++n_naming;
if (networkstatus[i]->is_recent)
++n_recent;
if (networkstatus[i]->lists_bad_exits)
++n_listing_bad_exits;
if (networkstatus[i]->lists_bad_directories)
++n_listing_bad_directories;
}
/** Iterate over all entries in all networkstatuses, and build
* name_map as a map from lc nickname to identity digest. If there
* is a conflict on that nickname, map the lc nickname to conflict.
*/
name_map = strmap_new();
/* Clear the global map... */
if (named_server_map)
strmap_free(named_server_map, _tor_free);
named_server_map = strmap_new();
memset(conflict, 0xff, sizeof(conflict));
for (i = 0; i < n_statuses; ++i) {
if (!networkstatus[i]->binds_names)
continue;
SMARTLIST_FOREACH(networkstatus[i]->entries, routerstatus_t *, rs,
{
const char *other_digest;
if (!rs->is_named)
continue;
other_digest = strmap_get_lc(name_map, rs->nickname);
warned = smartlist_string_isin(warned_conflicts, rs->nickname);
if (!other_digest) {
strmap_set_lc(name_map, rs->nickname, rs->identity_digest);
strmap_set_lc(named_server_map, rs->nickname,
tor_memdup(rs->identity_digest, DIGEST_LEN));
if (warned)
smartlist_string_remove(warned_conflicts, rs->nickname);
} else if (memcmp(other_digest, rs->identity_digest, DIGEST_LEN) &&
other_digest != conflict) {
if (!warned) {
char *d;
int should_warn = authdir_mode(options);
char fp1[HEX_DIGEST_LEN+1];
char fp2[HEX_DIGEST_LEN+1];
base16_encode(fp1, sizeof(fp1), other_digest, DIGEST_LEN);
base16_encode(fp2, sizeof(fp2), rs->identity_digest, DIGEST_LEN);
log_fn(should_warn ? LOG_WARN : LOG_INFO, LD_DIR,
"Naming authorities disagree about which key goes with %s. "
"($%s vs $%s)",
rs->nickname, fp1, fp2);
strmap_set_lc(name_map, rs->nickname, conflict);
d = strmap_remove_lc(named_server_map, rs->nickname);
tor_free(d);
smartlist_add(warned_conflicts, tor_strdup(rs->nickname));
}
} else {
if (warned)
smartlist_string_remove(warned_conflicts, rs->nickname);
}
});
}
result = smartlist_create();
changed_list = smartlist_create();
digest_counts = tor_malloc_zero(sizeof(desc_digest_count_t)*n_statuses);
/* Iterate through all of the sorted routerstatus lists in lockstep.
* Invariants:
* - For 0 <= i < n_statuses: index[i] is an index into
* networkstatus[i]->entries, which has size[i] elements.
* - For i1, i2, j such that 0 <= i1 < n_statuses, 0 <= i2 < n_statues, 0 <=
* j < index[i1]: networkstatus[i1]->entries[j]->identity_digest <
* networkstatus[i2]->entries[index[i2]]->identity_digest.
*
* (That is, the indices are always advanced past lower digest before
* higher.)
*/
while (1) {
int n_running=0, n_named=0, n_valid=0, n_listing=0;
int n_v2_dir=0, n_fast=0, n_stable=0, n_exit=0, n_guard=0, n_bad_exit=0;
int n_bad_directory=0;
int n_version_known=0, n_supports_begindir=0;
int n_supports_extrainfo_upload=0;
int n_desc_digests=0, highest_count=0;
const char *the_name = NULL;
routerstatus_t *rs_out, *rs_old;
routerstatus_t *rs, *most_recent;
networkstatus_t *ns;
const char *lowest = NULL;
/* Find out which of the digests appears first. */
for (i = 0; i < n_statuses; ++i) {
if (index[i] < size[i]) {
rs = smartlist_get(networkstatus[i]->entries, index[i]);
if (!lowest || memcmp(rs->identity_digest, lowest, DIGEST_LEN)<0)
lowest = rs->identity_digest;
}
}
if (!lowest) {
/* We're out of routers. Great! */
break;
}
/* Okay. The routers at networkstatus[i]->entries[index[i]] whose digests
* match "lowest" are next in order. Iterate over them, incrementing those
* index[i] as we go. */
for (i = 0; i < n_statuses; ++i) {
if (index[i] >= size[i])
continue;
ns = networkstatus[i];
rs = smartlist_get(ns->entries, index[i]);
if (memcmp(rs->identity_digest, lowest, DIGEST_LEN))
continue;
/* At this point, we know that we're looking at a routersatus with
* identity "lowest".
*/
++index[i];
++n_listing;
/* Should we name this router? Only if all the names from naming
* authorities match. */
if (rs->is_named && ns->binds_names) {
if (!the_name)
the_name = rs->nickname;
if (!strcasecmp(rs->nickname, the_name)) {
++n_named;
} else if (strcmp(the_name,"**mismatch**")) {
char hd[HEX_DIGEST_LEN+1];
base16_encode(hd, HEX_DIGEST_LEN+1, rs->identity_digest, DIGEST_LEN);
if (! smartlist_string_isin(warned_conflicts, hd)) {
log_warn(LD_DIR,
"Naming authorities disagree about nicknames for $%s "
"(\"%s\" vs \"%s\")",
hd, the_name, rs->nickname);
smartlist_add(warned_conflicts, tor_strdup(hd));
}
the_name = "**mismatch**";
}
}
/* Keep a running count of how often which descriptor digests
* appear. */
for (j = 0; j < n_desc_digests; ++j) {
if (!memcmp(rs->descriptor_digest,
digest_counts[j].rs->descriptor_digest, DIGEST_LEN)) {
if (++digest_counts[j].count > highest_count)
highest_count = digest_counts[j].count;
goto found;
}
}
digest_counts[n_desc_digests].rs = rs;
digest_counts[n_desc_digests].count = 1;
if (!highest_count)
highest_count = 1;
++n_desc_digests;
found:
/* Now tally up the easily-tallied flags. */
if (rs->is_valid)
++n_valid;
if (rs->is_running && ns->is_recent)
++n_running;
if (rs->is_exit)
++n_exit;
if (rs->is_fast)
++n_fast;
if (rs->is_possible_guard)
++n_guard;
if (rs->is_stable)
++n_stable;
if (rs->is_v2_dir)
++n_v2_dir;
if (rs->is_bad_exit)
++n_bad_exit;
if (rs->is_bad_directory)
++n_bad_directory;
if (rs->version_known)
++n_version_known;
if (rs->version_supports_begindir)
++n_supports_begindir;
if (rs->version_supports_extrainfo_upload)
++n_supports_extrainfo_upload;
}
/* Go over the descriptor digests and figure out which descriptor we
* want. */
most_recent = NULL;
for (i = 0; i < n_desc_digests; ++i) {
/* If any digest appears twice or more, ignore those that don't.*/
if (highest_count >= 2 && digest_counts[i].count < 2)
continue;
if (!most_recent ||
digest_counts[i].rs->published_on > most_recent->published_on)
most_recent = digest_counts[i].rs;
}
rs_out = tor_malloc_zero(sizeof(routerstatus_t));
memcpy(rs_out, most_recent, sizeof(routerstatus_t));
/* Copy status info about this router, if we had any before. */
if ((rs_old = router_get_combined_status_by_digest(lowest))) {
if (!memcmp(rs_out->descriptor_digest,
most_recent->descriptor_digest, DIGEST_LEN)) {
rs_out->dl_status.n_download_failures =
rs_old->dl_status.n_download_failures;
rs_out->dl_status.next_attempt_at = rs_old->dl_status.next_attempt_at;
}
rs_out->name_lookup_warned = rs_old->name_lookup_warned;
rs_out->last_dir_503_at = rs_old->last_dir_503_at;
}
smartlist_add(result, rs_out);
log_debug(LD_DIR, "Router '%s' is listed by %d/%d directories, "
"named by %d/%d, validated by %d/%d, and %d/%d recent "
"directories think it's running.",
rs_out->nickname,
n_listing, n_statuses, n_named, n_naming, n_valid, n_statuses,
n_running, n_recent);
rs_out->is_named = 0;
if (the_name && strcmp(the_name, "**mismatch**") && n_named > 0) {
const char *d = strmap_get_lc(name_map, the_name);
if (d && d != conflict)
rs_out->is_named = 1;
if (smartlist_string_isin(warned_conflicts, rs_out->nickname))
smartlist_string_remove(warned_conflicts, rs_out->nickname);
}
if (rs_out->is_named)
strlcpy(rs_out->nickname, the_name,
sizeof(rs_out->nickname));
rs_out->is_valid = n_valid > n_statuses/2;
rs_out->is_running = n_running > n_recent/2;
rs_out->is_exit = n_exit > n_statuses/2;
rs_out->is_fast = n_fast > n_statuses/2;
rs_out->is_possible_guard = n_guard > n_statuses/2;
rs_out->is_stable = n_stable > n_statuses/2;
rs_out->is_v2_dir = n_v2_dir > n_statuses/2;
rs_out->is_bad_exit = n_bad_exit > n_listing_bad_exits/2;
rs_out->is_bad_directory =
n_bad_directory > n_listing_bad_directories/2;
rs_out->version_known = n_version_known > 0;
rs_out->version_supports_begindir =
n_supports_begindir > n_version_known/2;
rs_out->version_supports_extrainfo_upload =
n_supports_extrainfo_upload > n_version_known/2;
if (!rs_old || memcmp(rs_old, rs_out, sizeof(routerstatus_t)))
smartlist_add(changed_list, rs_out);
}
SMARTLIST_FOREACH(routerstatus_list, routerstatus_t *, rs,
routerstatus_free(rs));
smartlist_free(routerstatus_list);
routerstatus_list = result;
if (routerstatus_by_desc_digest_map)
digestmap_free(routerstatus_by_desc_digest_map, NULL);
routerstatus_by_desc_digest_map = digestmap_new();
SMARTLIST_FOREACH(routerstatus_list, routerstatus_t *, rs,
digestmap_set(routerstatus_by_desc_digest_map,
rs->descriptor_digest,
rs));
tor_free(networkstatus);
tor_free(index);
tor_free(size);
tor_free(digest_counts);
strmap_free(name_map, NULL);
networkstatus_list_has_changed = 0;
routerstatus_list_has_changed = 1;
control_event_networkstatus_changed(changed_list);
smartlist_free(changed_list);
}
/** Given a list <b>routers</b> of routerinfo_t *, update each routers's
* is_named, is_valid, and is_running fields according to our current
* networkstatus_t documents. */ /* XXXX020 obsoleted by v3 */
void
routers_update_status_from_networkstatus(smartlist_t *routers,
int reset_failures)
{
trusted_dir_server_t *ds;
routerstatus_t *rs;
or_options_t *options = get_options();
int authdir = authdir_mode_v2(options);
int namingdir = authdir && options->NamingAuthoritativeDir;
if (!routerstatus_list)
return;
SMARTLIST_FOREACH(routers, routerinfo_t *, router,
{
const char *digest = router->cache_info.identity_digest;
rs = router_get_combined_status_by_digest(digest);
ds = router_get_trusteddirserver_by_digest(digest);
if (!rs)
continue;
if (!namingdir)
router->is_named = rs->is_named;
if (!authdir) {
/* If we're not an authdir, believe others. */
router->is_valid = rs->is_valid;
router->is_running = rs->is_running;
router->is_fast = rs->is_fast;
router->is_stable = rs->is_stable;
router->is_possible_guard = rs->is_possible_guard;
router->is_exit = rs->is_exit;
router->is_bad_exit = rs->is_bad_exit;
}
if (router->is_running && ds) {
download_status_reset(&ds->v2_ns_dl_status);
}
if (reset_failures) {
download_status_reset(&rs->dl_status);
}
});
router_dir_info_changed();
}
/** Return true iff we have downloaded, or attempted to download at least
* n_failures times, a network status for each authority. */
static int
have_tried_downloading_all_statuses(int n_failures)
{
smartlist_t *trusted_dir_servers = router_get_trusted_dir_servers();
SMARTLIST_FOREACH(trusted_dir_servers, trusted_dir_server_t *, ds,
{
if (!(ds->type & V2_AUTHORITY))
continue;
/* If we don't have the status, and we haven't failed to get the status,
* we haven't tried to get the status. */
if (!networkstatus_get_by_digest(ds->digest) &&
ds->v2_ns_dl_status.n_download_failures <= n_failures)
return 0;
});
return 1;
}
/** Generate networkstatus lines for a single routerstatus_t object, and
* return the result in a newly allocated string. Used only by controller
* interface (for now.) */
char *
networkstatus_getinfo_helper_single(routerstatus_t *rs)
{
char buf[256];
routerstatus_format_entry(buf, sizeof(buf), rs, NULL, 0);
return tor_strdup(buf);
}
/** If <b>question</b> is a string beginning with "ns/" in a format the
* control interface expects for a GETINFO question, set *<b>answer</b> to a
* newly-allocated string containing networkstatus lines for the appropriate
* ORs. Return 0 on success, -1 on unrecognized question format. */
int
getinfo_helper_networkstatus(control_connection_t *conn,
const char *question, char **answer)
{
routerstatus_t *status;
(void) conn;
if (!routerstatus_list) {
*answer = tor_strdup("");
return 0;
}
if (!strcmp(question, "ns/all")) {
smartlist_t *statuses = smartlist_create();
SMARTLIST_FOREACH(routerstatus_list, routerstatus_t *, rs,
{
smartlist_add(statuses, networkstatus_getinfo_helper_single(rs));
});
*answer = smartlist_join_strings(statuses, "", 0, NULL);
SMARTLIST_FOREACH(statuses, char *, cp, tor_free(cp));
smartlist_free(statuses);
return 0;
} else if (!strcmpstart(question, "ns/id/")) {
char d[DIGEST_LEN];
if (base16_decode(d, DIGEST_LEN, question+6, strlen(question+6)))
return -1;
status = router_get_combined_status_by_digest(d);
} else if (!strcmpstart(question, "ns/name/")) {
status = router_get_combined_status_by_nickname(question+8, 0);
} else {
return -1;
}
if (status) {
*answer = networkstatus_getinfo_helper_single(status);
}
return 0;
}
/** DOCDOC */
void
networkstatus_free_all(void)
{
if (networkstatus_list) {
SMARTLIST_FOREACH(networkstatus_list, networkstatus_t *, ns,
networkstatus_free(ns));
smartlist_free(networkstatus_list);
networkstatus_list = NULL;
}
if (routerstatus_list) {
SMARTLIST_FOREACH(routerstatus_list, routerstatus_t *, rs,
routerstatus_free(rs));
smartlist_free(routerstatus_list);
routerstatus_list = NULL;
}
if (routerstatus_by_desc_digest_map) {
digestmap_free(routerstatus_by_desc_digest_map, NULL);
routerstatus_by_desc_digest_map = NULL;
}
if (current_consensus) {
networkstatus_vote_free(current_consensus);
current_consensus = NULL;
}
if (consensus_waiting_for_certs) {
networkstatus_vote_free(current_consensus);
current_consensus = NULL;
}
tor_free(consensus_waiting_for_certs_body);
if (warned_conflicts) {
SMARTLIST_FOREACH(warned_conflicts, char *, cp, tor_free(cp));
smartlist_free(warned_conflicts);
warned_conflicts = NULL;
}
if (named_server_map) {
strmap_free(named_server_map, _tor_free);
}
}
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