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tor/src/or/networkstatus.c
Karsten Loesing 1293835440 Lower dir fetch retry schedules in testing networks. 
Also lower maximum interval without directory requests, and raise
maximum download tries.

Implements #6752.
2013-05-16 12:08:48 +02:00

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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2013, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file networkstatus.c
* \brief Functions and structures for handling network status documents as a
* client or cache.
*/
#include "or.h"
#include "channel.h"
#include "circuitmux.h"
#include "circuitmux_ewma.h"
#include "circuitstats.h"
#include "config.h"
#include "connection.h"
#include "connection_or.h"
#include "control.h"
#include "directory.h"
#include "dirserv.h"
#include "dirvote.h"
#include "entrynodes.h"
#include "main.h"
#include "microdesc.h"
#include "networkstatus.h"
#include "nodelist.h"
#include "relay.h"
#include "router.h"
#include "routerlist.h"
#include "routerparse.h"
/* For tracking v2 networkstatus documents. Only caches do this now. */
/** Map from descriptor digest of routers listed in the v2 networkstatus
* documents to download_status_t* */
static digestmap_t *v2_download_status_map = NULL;
/** Global list of all of the current v2 network_status documents that we know
* about. This list is kept sorted by published_on. */
static smartlist_t *networkstatus_v2_list = NULL;
/** True iff any member of networkstatus_v2_list has changed since the last
* time we called download_status_map_update_from_v2_networkstatus() */
static int networkstatus_v2_list_has_changed = 0;
/** Map from lowercase nickname to identity digest of named server, if any. */
static strmap_t *named_server_map = NULL;
/** Map from lowercase nickname to (void*)1 for all names that are listed
* as unnamed for some server in the consensus. */
static strmap_t *unnamed_server_map = NULL;
/** Most recently received and validated v3 consensus network status,
* of whichever type we are using for our own circuits. This will be the same
* as one of current_ns_consensus or current_md_consensus.
*/
#define current_consensus \
(we_use_microdescriptors_for_circuits(get_options()) ? \
current_md_consensus : current_ns_consensus)
/** Most recently received and validated v3 "ns"-flavored consensus network
* status. */
static networkstatus_t *current_ns_consensus = NULL;
/** Most recently received and validated v3 "microdec"-flavored consensus
* network status. */
static networkstatus_t *current_md_consensus = NULL;
/** A v3 consensus networkstatus that we've received, but which we don't
* have enough certificates to be happy about. */
typedef struct consensus_waiting_for_certs_t {
/** The consensus itself. */
networkstatus_t *consensus;
/** The encoded version of the consensus, nul-terminated. */
char *body;
/** When did we set the current value of consensus_waiting_for_certs? If
* this is too recent, we shouldn't try to fetch a new consensus for a
* little while, to give ourselves time to get certificates for this one. */
time_t set_at;
/** Set to 1 if we've been holding on to it for so long we should maybe
* treat it as being bad. */
int dl_failed;
} consensus_waiting_for_certs_t;
/** An array, for each flavor of consensus we might want, of consensuses that
* we have downloaded, but which we cannot verify due to having insufficient
* authority certificates. */
static consensus_waiting_for_certs_t
consensus_waiting_for_certs[N_CONSENSUS_FLAVORS];
/** 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;
/** A time before which we shouldn't try to replace the current consensus:
* this will be at some point after the next consensus becomes valid, but
* before the current consensus becomes invalid. */
static time_t time_to_download_next_consensus[N_CONSENSUS_FLAVORS];
/** Download status for the current consensus networkstatus. */
static download_status_t consensus_dl_status[N_CONSENSUS_FLAVORS];
/** 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 void download_status_map_update_from_v2_networkstatus(void);
static void routerstatus_list_update_named_server_map(void);
/** Forget that we've warned about anything networkstatus-related, so we will
* give fresh warnings if the same behavior happens again. */
void
networkstatus_reset_warnings(void)
{
if (current_consensus) {
SMARTLIST_FOREACH(nodelist_get_list(), node_t *, node,
node->name_lookup_warned = 0);
}
have_warned_about_old_version = 0;
have_warned_about_new_version = 0;
}
/** Reset the descriptor download failure count on all networkstatus docs, so
* that we can retry any long-failed documents immediately.
*/
void
networkstatus_reset_download_failures(void)
{
int i;
const smartlist_t *networkstatus_v2_list = networkstatus_get_v2_list();
SMARTLIST_FOREACH_BEGIN(networkstatus_v2_list, networkstatus_v2_t *, ns) {
SMARTLIST_FOREACH_BEGIN(ns->entries, routerstatus_t *, rs) {
if (!router_get_by_descriptor_digest(rs->descriptor_digest))
rs->need_to_mirror = 1;
} SMARTLIST_FOREACH_END(rs);
} SMARTLIST_FOREACH_END(ns);
for (i=0; i < N_CONSENSUS_FLAVORS; ++i)
download_status_reset(&consensus_dl_status[i]);
if (v2_download_status_map) {
digestmap_iter_t *iter;
digestmap_t *map = v2_download_status_map;
const char *key;
void *val;
download_status_t *dls;
for (iter = digestmap_iter_init(map); !digestmap_iter_done(iter);
iter = digestmap_iter_next(map, iter) ) {
digestmap_iter_get(iter, &key, &val);
dls = val;
download_status_reset(dls);
}
}
}
/** Repopulate our list of network_status_t objects from the list cached on
* disk. Return 0 on success, -1 on failure. */
int
router_reload_v2_networkstatus(void)
{
smartlist_t *entries;
struct stat st;
char *s;
char *filename = get_datadir_fname("cached-status");
int maybe_delete = !directory_caches_v2_dir_info(get_options());
time_t now = time(NULL);
if (!networkstatus_v2_list)
networkstatus_v2_list = smartlist_new();
entries = tor_listdir(filename);
if (!entries) { /* dir doesn't exist */
tor_free(filename);
return 0;
} else if (!smartlist_len(entries) && maybe_delete) {
rmdir(filename);
tor_free(filename);
smartlist_free(entries);
return 0;
}
tor_free(filename);
SMARTLIST_FOREACH_BEGIN(entries, const char *, fn) {
char buf[DIGEST_LEN];
if (maybe_delete) {
filename = get_datadir_fname2("cached-status", fn);
remove_file_if_very_old(filename, now);
tor_free(filename);
continue;
}
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;
}
filename = get_datadir_fname2("cached-status", fn);
s = read_file_to_str(filename, 0, &st);
if (s) {
if (router_set_networkstatus_v2(s, st.st_mtime, NS_FROM_CACHE,
NULL)<0) {
log_warn(LD_FS, "Couldn't load networkstatus from \"%s\"",filename);
}
tor_free(s);
}
tor_free(filename);
} SMARTLIST_FOREACH_END(fn);
SMARTLIST_FOREACH(entries, char *, fn, tor_free(fn));
smartlist_free(entries);
networkstatus_v2_list_clean(time(NULL));
routers_update_all_from_networkstatus(time(NULL), 2);
return 0;
}
/** Read every cached v3 consensus networkstatus from the disk. */
int
router_reload_consensus_networkstatus(void)
{
char *filename;
char *s;
const unsigned int flags = NSSET_FROM_CACHE | NSSET_DONT_DOWNLOAD_CERTS;
int flav;
/* FFFF Suppress warnings if cached consensus is bad? */
for (flav = 0; flav < N_CONSENSUS_FLAVORS; ++flav) {
char buf[128];
const char *flavor = networkstatus_get_flavor_name(flav);
if (flav == FLAV_NS) {
filename = get_datadir_fname("cached-consensus");
} else {
tor_snprintf(buf, sizeof(buf), "cached-%s-consensus", flavor);
filename = get_datadir_fname(buf);
}
s = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL);
if (s) {
if (networkstatus_set_current_consensus(s, flavor, flags) < -1) {
log_warn(LD_FS, "Couldn't load consensus %s networkstatus from \"%s\"",
flavor, filename);
}
tor_free(s);
}
tor_free(filename);
if (flav == FLAV_NS) {
filename = get_datadir_fname("unverified-consensus");
} else {
tor_snprintf(buf, sizeof(buf), "unverified-%s-consensus", flavor);
filename = get_datadir_fname(buf);
}
s = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL);
if (s) {
if (networkstatus_set_current_consensus(s, flavor,
flags|NSSET_WAS_WAITING_FOR_CERTS)) {
log_info(LD_FS, "Couldn't load consensus %s networkstatus from \"%s\"",
flavor, filename);
}
tor_free(s);
}
tor_free(filename);
}
if (!current_consensus) {
if (!named_server_map)
named_server_map = strmap_new();
if (!unnamed_server_map)
unnamed_server_map = strmap_new();
}
update_certificate_downloads(time(NULL));
routers_update_all_from_networkstatus(time(NULL), 3);
update_microdescs_from_networkstatus(time(NULL));
return 0;
}
/** Free all storage held by the vote_routerstatus object <b>rs</b>. */
static void
vote_routerstatus_free(vote_routerstatus_t *rs)
{
vote_microdesc_hash_t *h, *next;
if (!rs)
return;
tor_free(rs->version);
tor_free(rs->status.exitsummary);
for (h = rs->microdesc; h; h = next) {
tor_free(h->microdesc_hash_line);
next = h->next;
tor_free(h);
}
tor_free(rs);
}
/** Free all storage held by the routerstatus object <b>rs</b>. */
void
routerstatus_free(routerstatus_t *rs)
{
if (!rs)
return;
tor_free(rs->exitsummary);
tor_free(rs);
}
/** Free all storage held by the networkstatus object <b>ns</b>. */
void
networkstatus_v2_free(networkstatus_v2_t *ns)
{
if (!ns)
return;
tor_free(ns->source_address);
tor_free(ns->contact);
if (ns->signing_key)
crypto_pk_free(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 storage held in <b>sig</b> */
void
document_signature_free(document_signature_t *sig)
{
tor_free(sig->signature);
tor_free(sig);
}
/** Return a newly allocated copy of <b>sig</b> */
document_signature_t *
document_signature_dup(const document_signature_t *sig)
{
document_signature_t *r = tor_memdup(sig, sizeof(document_signature_t));
if (r->signature)
r->signature = tor_memdup(sig->signature, sig->signature_len);
return r;
}
/** Free all storage held in <b>ns</b>. */
void
networkstatus_vote_free(networkstatus_t *ns)
{
if (!ns)
return;
tor_free(ns->client_versions);
tor_free(ns->server_versions);
if (ns->known_flags) {
SMARTLIST_FOREACH(ns->known_flags, char *, c, tor_free(c));
smartlist_free(ns->known_flags);
}
if (ns->weight_params) {
SMARTLIST_FOREACH(ns->weight_params, char *, c, tor_free(c));
smartlist_free(ns->weight_params);
}
if (ns->net_params) {
SMARTLIST_FOREACH(ns->net_params, char *, c, tor_free(c));
smartlist_free(ns->net_params);
}
if (ns->supported_methods) {
SMARTLIST_FOREACH(ns->supported_methods, char *, c, tor_free(c));
smartlist_free(ns->supported_methods);
}
if (ns->voters) {
SMARTLIST_FOREACH_BEGIN(ns->voters, networkstatus_voter_info_t *, voter) {
tor_free(voter->nickname);
tor_free(voter->address);
tor_free(voter->contact);
if (voter->sigs) {
SMARTLIST_FOREACH(voter->sigs, document_signature_t *, sig,
document_signature_free(sig));
smartlist_free(voter->sigs);
}
tor_free(voter);
} SMARTLIST_FOREACH_END(voter);
smartlist_free(ns->voters);
}
authority_cert_free(ns->cert);
if (ns->routerstatus_list) {
if (ns->type == NS_TYPE_VOTE || ns->type == NS_TYPE_OPINION) {
SMARTLIST_FOREACH(ns->routerstatus_list, vote_routerstatus_t *, rs,
vote_routerstatus_free(rs));
} else {
SMARTLIST_FOREACH(ns->routerstatus_list, routerstatus_t *, rs,
routerstatus_free(rs));
}
smartlist_free(ns->routerstatus_list);
}
digestmap_free(ns->desc_digest_map, NULL);
memwipe(ns, 11, sizeof(*ns));
tor_free(ns);
}
/** Return the voter info from <b>vote</b> for the voter whose identity digest
* is <b>identity</b>, or NULL if no such voter is associated with
* <b>vote</b>. */
networkstatus_voter_info_t *
networkstatus_get_voter_by_id(networkstatus_t *vote,
const char *identity)
{
if (!vote || !vote->voters)
return NULL;
SMARTLIST_FOREACH(vote->voters, networkstatus_voter_info_t *, voter,
if (fast_memeq(voter->identity_digest, identity, DIGEST_LEN))
return voter);
return NULL;
}
/** Check whether the signature <b>sig</b> is correctly signed with the
* signing key in <b>cert</b>. Return -1 if <b>cert</b> doesn't match the
* signing key; otherwise set the good_signature or bad_signature flag on
* <b>voter</b>, and return 0. */
int
networkstatus_check_document_signature(const networkstatus_t *consensus,
document_signature_t *sig,
const authority_cert_t *cert)
{
char key_digest[DIGEST_LEN];
const int dlen = sig->alg == DIGEST_SHA1 ? DIGEST_LEN : DIGEST256_LEN;
char *signed_digest;
size_t signed_digest_len;
if (crypto_pk_get_digest(cert->signing_key, key_digest)<0)
return -1;
if (tor_memneq(sig->signing_key_digest, key_digest, DIGEST_LEN) ||
tor_memneq(sig->identity_digest, cert->cache_info.identity_digest,
DIGEST_LEN))
return -1;
signed_digest_len = crypto_pk_keysize(cert->signing_key);
signed_digest = tor_malloc(signed_digest_len);
if (crypto_pk_public_checksig(cert->signing_key,
signed_digest,
signed_digest_len,
sig->signature,
sig->signature_len) < dlen ||
tor_memneq(signed_digest, consensus->digests.d[sig->alg], dlen)) {
log_warn(LD_DIR, "Got a bad signature on a networkstatus vote");
sig->bad_signature = 1;
} else {
sig->good_signature = 1;
}
tor_free(signed_digest);
return 0;
}
/** Given a v3 networkstatus consensus in <b>consensus</b>, check every
* as-yet-unchecked signature on <b>consensus</b>. Return 1 if there is a
* signature from every recognized authority on it, 0 if there are
* enough good signatures from recognized authorities on it, -1 if we might
* get enough good signatures by fetching missing certificates, and -2
* otherwise. Log messages at INFO or WARN: if <b>warn</b> is over 1, warn
* about every problem; if warn is at least 1, warn only if we can't get
* enough signatures; if warn is negative, log nothing at all. */
int
networkstatus_check_consensus_signature(networkstatus_t *consensus,
int warn)
{
int n_good = 0;
int n_missing_key = 0, n_dl_failed_key = 0;
int n_bad = 0;
int n_unknown = 0;
int n_no_signature = 0;
int n_v3_authorities = get_n_authorities(V3_DIRINFO);
int n_required = n_v3_authorities/2 + 1;
smartlist_t *list_good = smartlist_new();
smartlist_t *list_no_signature = smartlist_new();
smartlist_t *need_certs_from = smartlist_new();
smartlist_t *unrecognized = smartlist_new();
smartlist_t *missing_authorities = smartlist_new();
int severity;
time_t now = time(NULL);
tor_assert(consensus->type == NS_TYPE_CONSENSUS);
SMARTLIST_FOREACH_BEGIN(consensus->voters, networkstatus_voter_info_t *,
voter) {
int good_here = 0;
int bad_here = 0;
int unknown_here = 0;
int missing_key_here = 0, dl_failed_key_here = 0;
SMARTLIST_FOREACH_BEGIN(voter->sigs, document_signature_t *, sig) {
if (!sig->good_signature && !sig->bad_signature &&
sig->signature) {
/* we can try to check the signature. */
int is_v3_auth = trusteddirserver_get_by_v3_auth_digest(
sig->identity_digest) != NULL;
authority_cert_t *cert =
authority_cert_get_by_digests(sig->identity_digest,
sig->signing_key_digest);
tor_assert(tor_memeq(sig->identity_digest, voter->identity_digest,
DIGEST_LEN));
if (!is_v3_auth) {
smartlist_add(unrecognized, voter);
++unknown_here;
continue;
} else if (!cert || cert->expires < now) {
smartlist_add(need_certs_from, voter);
++missing_key_here;
if (authority_cert_dl_looks_uncertain(sig->identity_digest))
++dl_failed_key_here;
continue;
}
if (networkstatus_check_document_signature(consensus, sig, cert) < 0) {
smartlist_add(need_certs_from, voter);
++missing_key_here;
if (authority_cert_dl_looks_uncertain(sig->identity_digest))
++dl_failed_key_here;
continue;
}
}
if (sig->good_signature)
++good_here;
else if (sig->bad_signature)
++bad_here;
} SMARTLIST_FOREACH_END(sig);
if (good_here) {
++n_good;
smartlist_add(list_good, voter->nickname);
} else if (bad_here) {
++n_bad;
} else if (missing_key_here) {
++n_missing_key;
if (dl_failed_key_here)
++n_dl_failed_key;
} else if (unknown_here) {
++n_unknown;
} else {
++n_no_signature;
smartlist_add(list_no_signature, voter->nickname);
}
} SMARTLIST_FOREACH_END(voter);
/* Now see whether we're missing any voters entirely. */
SMARTLIST_FOREACH(router_get_trusted_dir_servers(),
dir_server_t *, ds,
{
if ((ds->type & V3_DIRINFO) &&
!networkstatus_get_voter_by_id(consensus, ds->v3_identity_digest))
smartlist_add(missing_authorities, ds);
});
if (warn > 1 || (warn >= 0 &&
(n_good + n_missing_key - n_dl_failed_key < n_required))) {
severity = LOG_WARN;
} else {
severity = LOG_INFO;
}
if (warn >= 0) {
SMARTLIST_FOREACH(unrecognized, networkstatus_voter_info_t *, voter,
{
tor_log(severity, LD_DIR, "Consensus includes unrecognized authority "
"'%s' at %s:%d (contact %s; identity %s)",
voter->nickname, voter->address, (int)voter->dir_port,
voter->contact?voter->contact:"n/a",
hex_str(voter->identity_digest, DIGEST_LEN));
});
SMARTLIST_FOREACH(need_certs_from, networkstatus_voter_info_t *, voter,
{
tor_log(severity, LD_DIR, "Looks like we need to download a new "
"certificate from authority '%s' at %s:%d (contact %s; "
"identity %s)",
voter->nickname, voter->address, (int)voter->dir_port,
voter->contact?voter->contact:"n/a",
hex_str(voter->identity_digest, DIGEST_LEN));
});
SMARTLIST_FOREACH(missing_authorities, dir_server_t *, ds,
{
tor_log(severity, LD_DIR, "Consensus does not include configured "
"authority '%s' at %s:%d (identity %s)",
ds->nickname, ds->address, (int)ds->dir_port,
hex_str(ds->v3_identity_digest, DIGEST_LEN));
});
{
char *joined;
smartlist_t *sl = smartlist_new();
char *tmp = smartlist_join_strings(list_good, " ", 0, NULL);
smartlist_add_asprintf(sl,
"A consensus needs %d good signatures from recognized "
"authorities for us to accept it. This one has %d (%s).",
n_required, n_good, tmp);
tor_free(tmp);
if (n_no_signature) {
tmp = smartlist_join_strings(list_no_signature, " ", 0, NULL);
smartlist_add_asprintf(sl,
"%d (%s) of the authorities we know didn't sign it.",
n_no_signature, tmp);
tor_free(tmp);
}
if (n_unknown) {
smartlist_add_asprintf(sl,
"It has %d signatures from authorities we don't "
"recognize.", n_unknown);
}
if (n_bad) {
smartlist_add_asprintf(sl, "%d of the signatures on it didn't verify "
"correctly.", n_bad);
}
if (n_missing_key) {
smartlist_add_asprintf(sl,
"We were unable to check %d of the signatures, "
"because we were missing the keys.", n_missing_key);
}
joined = smartlist_join_strings(sl, " ", 0, NULL);
tor_log(severity, LD_DIR, "%s", joined);
tor_free(joined);
SMARTLIST_FOREACH(sl, char *, c, tor_free(c));
smartlist_free(sl);
}
}
smartlist_free(list_good);
smartlist_free(list_no_signature);
smartlist_free(unrecognized);
smartlist_free(need_certs_from);
smartlist_free(missing_authorities);
if (n_good == n_v3_authorities)
return 1;
else if (n_good >= n_required)
return 0;
else if (n_good + n_missing_key >= n_required)
return -1;
else
return -2;
}
/** 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)
{
char fp[HEX_DIGEST_LEN+1];
base16_encode(fp, HEX_DIGEST_LEN+1, identity_digest, DIGEST_LEN);
return get_datadir_fname2("cached-status", fp);
}
/** Helper for smartlist_sort: Compare two networkstatus objects by
* publication date. */
static int
compare_networkstatus_v2_published_on_(const void **_a, const void **_b)
{
const networkstatus_v2_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 v2 networkstatus 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,
v2_networkstatus_source_t source,
networkstatus_v2_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 (directory_caches_v2_dir_info(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_v2(const char *s, time_t arrived_at,
v2_networkstatus_source_t source,
smartlist_t *requested_fingerprints)
{
networkstatus_v2_t *ns;
int i, found;
time_t now;
int skewed = 0;
dir_server_t *trusted_dir = NULL;
const char *source_desc = NULL;
char fp[HEX_DIGEST_LEN+1];
char published[ISO_TIME_LEN+1];
if (!directory_caches_v2_dir_info(get_options()))
return 0; /* Don't bother storing it. */
ns = networkstatus_v2_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_DIRINFO)) {
log_info(LD_DIR, "Network status was signed, but not by an authoritative "
"directory we recognize.");
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) {
char dbuf[64];
long delta = now - ns->published_on;
format_time_interval(dbuf, sizeof(dbuf), delta);
log_warn(LD_GENERAL, "Network status from %s was published %s in the "
"future (%s UTC). Check your time and date settings! "
"Not caching.",
source_desc, dbuf, published);
control_event_general_status(LOG_WARN,
"CLOCK_SKEW MIN_SKEW=%ld SOURCE=NETWORKSTATUS:%s:%d",
delta, ns->source_address, ns->source_dirport);
skewed = 1;
}
if (!networkstatus_v2_list)
networkstatus_v2_list = smartlist_new();
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_v2_free(ns);
return 0;
}
if (requested_fingerprints) {
if (smartlist_contains_string(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) {
/* 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_v2_free(ns);
}
return 0;
}
found = 0;
for (i=0; i < smartlist_len(networkstatus_v2_list); ++i) {
networkstatus_v2_t *old_ns = smartlist_get(networkstatus_v2_list, i);
if (tor_memeq(old_ns->identity_digest, ns->identity_digest, DIGEST_LEN)) {
if (tor_memeq(old_ns->networkstatus_digest,
ns->networkstatus_digest, DIGEST_LEN)) {
/* Same one we had before. */
networkstatus_v2_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_v2_free(ns);
download_status_failed(&trusted_dir->v2_ns_dl_status, 0);
return 0;
} else {
networkstatus_v2_free(old_ns);
smartlist_set(networkstatus_v2_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_v2_list, ns);
/** Retain any routerinfo mentioned in a V2 networkstatus for at least this
* long. */
#define V2_NETWORKSTATUS_ROUTER_LIFETIME (3*60*60)
{
time_t live_until = ns->published_on + V2_NETWORKSTATUS_ROUTER_LIFETIME;
SMARTLIST_FOREACH_BEGIN(ns->entries, routerstatus_t *, rs) {
signed_descriptor_t *sd =
router_get_by_descriptor_digest(rs->descriptor_digest);
if (sd) {
if (sd->last_listed_as_valid_until < live_until)
sd->last_listed_as_valid_until = live_until;
} else {
rs->need_to_mirror = 1;
}
} SMARTLIST_FOREACH_END(rs);
}
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_v2_list_has_changed = 1;
smartlist_sort(networkstatus_v2_list,
compare_networkstatus_v2_published_on_);
if (!skewed)
add_networkstatus_to_cache(s, source, ns);
return 0;
}
/** Remove all very-old network_status_t objects from memory and from the
* disk cache. */
void
networkstatus_v2_list_clean(time_t now)
{
int i;
if (!networkstatus_v2_list)
return;
for (i = 0; i < smartlist_len(networkstatus_v2_list); ++i) {
networkstatus_v2_t *ns = smartlist_get(networkstatus_v2_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_v2_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 (directory_caches_v2_dir_info(get_options())) {
dirserv_set_cached_networkstatus_v2(NULL, ns->identity_digest, 0);
}
networkstatus_v2_free(ns);
}
/* 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: compare a
* digest in the key to the identity digest of a routerstatus_t. */
int
compare_digest_to_routerstatus_entry(const void *_key, const void **_member)
{
const char *key = _key;
const routerstatus_t *rs = *_member;
return tor_memcmp(key, rs->identity_digest, DIGEST_LEN);
}
/** Helper for bsearching a list of routerstatus_t pointers: compare a
* digest in the key to the identity digest of a routerstatus_t. */
int
compare_digest_to_vote_routerstatus_entry(const void *_key,
const void **_member)
{
const char *key = _key;
const vote_routerstatus_t *vrs = *_member;
return tor_memcmp(key, vrs->status.identity_digest, DIGEST_LEN);
}
/** As networkstatus_v2_find_entry, but do not return a const pointer */
routerstatus_t *
networkstatus_v2_find_mutable_entry(networkstatus_v2_t *ns, const char *digest)
{
return smartlist_bsearch(ns->entries, digest,
compare_digest_to_routerstatus_entry);
}
/** Return the entry in <b>ns</b> for the identity digest <b>digest</b>, or
* NULL if none was found. */
const routerstatus_t *
networkstatus_v2_find_entry(networkstatus_v2_t *ns, const char *digest)
{
return networkstatus_v2_find_mutable_entry(ns, digest);
}
/** As networkstatus_find_entry, but do not return a const pointer */
routerstatus_t *
networkstatus_vote_find_mutable_entry(networkstatus_t *ns, const char *digest)
{
return smartlist_bsearch(ns->routerstatus_list, digest,
compare_digest_to_routerstatus_entry);
}
/** Return the entry in <b>ns</b> for the identity digest <b>digest</b>, or
* NULL if none was found. */
const routerstatus_t *
networkstatus_vote_find_entry(networkstatus_t *ns, const char *digest)
{
return networkstatus_vote_find_mutable_entry(ns, digest);
}
/*XXXX MOVE make this static once functions are moved into this file. */
/** Search the routerstatuses in <b>ns</b> for one whose identity digest is
* <b>digest</b>. Return value and set *<b>found_out</b> as for
* smartlist_bsearch_idx(). */
int
networkstatus_vote_find_entry_idx(networkstatus_t *ns,
const char *digest, int *found_out)
{
return smartlist_bsearch_idx(ns->routerstatus_list, digest,
compare_digest_to_routerstatus_entry,
found_out);
}
/** Return a list of the v2 networkstatus documents. */
const smartlist_t *
networkstatus_get_v2_list(void)
{
if (!networkstatus_v2_list)
networkstatus_v2_list = smartlist_new();
return networkstatus_v2_list;
}
/** As router_get_consensus_status_by_descriptor_digest, but does not return
* a const pointer. */
routerstatus_t *
router_get_mutable_consensus_status_by_descriptor_digest(
networkstatus_t *consensus,
const char *digest)
{
if (!consensus)
consensus = current_consensus;
if (!consensus)
return NULL;
if (!consensus->desc_digest_map) {
digestmap_t *m = consensus->desc_digest_map = digestmap_new();
SMARTLIST_FOREACH(consensus->routerstatus_list,
routerstatus_t *, rs,
{
digestmap_set(m, rs->descriptor_digest, rs);
});
}
return digestmap_get(consensus->desc_digest_map, digest);
}
/** Return the consensus view of the status of the router whose current
* <i>descriptor</i> digest in <b>consensus</b> is <b>digest</b>, or NULL if
* no such router is known. */
const routerstatus_t *
router_get_consensus_status_by_descriptor_digest(networkstatus_t *consensus,
const char *digest)
{
return router_get_mutable_consensus_status_by_descriptor_digest(
consensus, digest);
}
/** Given the digest of a router descriptor, return its current download
* status, or NULL if the digest is unrecognized. */
download_status_t *
router_get_dl_status_by_descriptor_digest(const char *d)
{
routerstatus_t *rs;
if (!current_ns_consensus)
return NULL;
if ((rs = router_get_mutable_consensus_status_by_descriptor_digest(
current_ns_consensus, d)))
return &rs->dl_status;
if (v2_download_status_map)
return digestmap_get(v2_download_status_map, d);
return NULL;
}
/** As router_get_consensus_status_by_id, but do not return a const pointer */
routerstatus_t *
router_get_mutable_consensus_status_by_id(const char *digest)
{
if (!current_consensus)
return NULL;
return smartlist_bsearch(current_consensus->routerstatus_list, digest,
compare_digest_to_routerstatus_entry);
}
/** 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. */
const routerstatus_t *
router_get_consensus_status_by_id(const char *digest)
{
return router_get_mutable_consensus_status_by_id(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. */
const routerstatus_t *
router_get_consensus_status_by_nickname(const char *nickname,
int warn_if_unnamed)
{
const node_t *node = node_get_by_nickname(nickname, warn_if_unnamed);
if (node)
return node->rs;
else
return NULL;
}
/** Return the identity digest that's mapped to officially by
* <b>nickname</b>. */
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);
}
/** Return true iff <b>nickname</b> is disallowed from being the nickname
* of any server. */
int
networkstatus_nickname_is_unnamed(const char *nickname)
{
if (!unnamed_server_map)
return 0;
return strmap_get_lc(unnamed_server_map, nickname) != NULL;
}
/** How frequently do directory authorities re-download fresh networkstatus
* documents? */
#define AUTHORITY_NS_CACHE_INTERVAL (10*60)
/** How frequently do non-authority directory caches re-download fresh
* networkstatus documents? */
#define NONAUTHORITY_NS_CACHE_INTERVAL (60*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_BEGIN(trusted_dir_servers, dir_server_t *, ds)
{
char resource[HEX_DIGEST_LEN+6]; /* fp/hexdigit.z\0 */
tor_addr_t addr;
if (!(ds->type & V2_DIRINFO))
continue;
if (router_digest_is_me(ds->digest))
continue;
tor_addr_from_ipv4h(&addr, ds->addr);
/* Is this quite sensible with IPv6 or multiple addresses? */
if (connection_get_by_type_addr_port_purpose(
CONN_TYPE_DIR, &addr, ds->dir_port,
DIR_PURPOSE_FETCH_V2_NETWORKSTATUS)) {
/* XXX 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 */
/* Only directory caches download v2 networkstatuses, and they
* don't use tunneled connections. I think it's okay to ignore
* this. */
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_V2_NETWORKSTATUS,
ROUTER_PURPOSE_GENERAL,
DIRIND_ONEHOP,
resource,
NULL, 0 /* No payload. */,
0 /* No I-M-S. */);
}
SMARTLIST_FOREACH_END(ds);
} 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_V2_NETWORKSTATUS))
directory_get_from_dirserver(DIR_PURPOSE_FETCH_V2_NETWORKSTATUS,
ROUTER_PURPOSE_GENERAL, "all.z",
PDS_RETRY_IF_NO_SERVERS);
}
}
/** Return true iff, given the options listed in <b>options</b>, <b>flavor</b>
* is the flavor of a consensus networkstatus that we would like to fetch. */
static int
we_want_to_fetch_flavor(const or_options_t *options, int flavor)
{
if (flavor < 0 || flavor > N_CONSENSUS_FLAVORS) {
/* This flavor is crazy; we don't want it */
/*XXXX handle unrecognized flavors later */
return 0;
}
if (authdir_mode_v3(options) || directory_caches_dir_info(options)) {
/* We want to serve all flavors to others, regardless if we would use
* it ourselves. */
return 1;
}
if (options->FetchUselessDescriptors) {
/* In order to get all descriptors, we need to fetch all consensuses. */
return 1;
}
/* Otherwise, we want the flavor only if we want to use it to build
* circuits. */
return flavor == usable_consensus_flavor();
}
/** How long will we hang onto a possibly live consensus for which we're
* fetching certs before we check whether there is a better one? */
#define DELAY_WHILE_FETCHING_CERTS (20*60)
/** If we want to download a fresh consensus, launch a new download as
* appropriate. */
static void
update_consensus_networkstatus_downloads(time_t now)
{
int i;
const or_options_t *options = get_options();
for (i=0; i < N_CONSENSUS_FLAVORS; ++i) {
/* XXXX need some way to download unknown flavors if we are caching. */
const char *resource;
consensus_waiting_for_certs_t *waiting;
networkstatus_t *c;
if (! we_want_to_fetch_flavor(options, i))
continue;
c = networkstatus_get_latest_consensus_by_flavor(i);
if (! (c && c->valid_after <= now && now <= c->valid_until)) {
/* No live consensus? Get one now!*/
time_to_download_next_consensus[i] = now;
}
if (time_to_download_next_consensus[i] > now)
return; /* Wait until the current consensus is older. */
resource = networkstatus_get_flavor_name(i);
if (!download_status_is_ready(&consensus_dl_status[i], now,
options->TestingConsensusMaxDownloadTries))
continue; /* We failed downloading a consensus too recently. */
if (connection_dir_get_by_purpose_and_resource(
DIR_PURPOSE_FETCH_CONSENSUS, resource))
continue; /* There's an in-progress download.*/
waiting = &consensus_waiting_for_certs[i];
if (waiting->consensus) {
/* XXXX make sure this doesn't delay sane downloads. */
if (waiting->set_at + DELAY_WHILE_FETCHING_CERTS > now) {
continue; /* We're still getting certs for this one. */
} else {
if (!waiting->dl_failed) {
download_status_failed(&consensus_dl_status[i], 0);
waiting->dl_failed=1;
}
}
}
log_info(LD_DIR, "Launching %s networkstatus consensus download.",
networkstatus_get_flavor_name(i));
directory_get_from_dirserver(DIR_PURPOSE_FETCH_CONSENSUS,
ROUTER_PURPOSE_GENERAL, resource,
PDS_RETRY_IF_NO_SERVERS);
}
}
/** Called when an attempt to download a consensus fails: note that the
* failure occurred, and possibly retry. */
void
networkstatus_consensus_download_failed(int status_code, const char *flavname)
{
int flav = networkstatus_parse_flavor_name(flavname);
if (flav >= 0) {
tor_assert(flav < N_CONSENSUS_FLAVORS);
/* XXXX handle unrecognized flavors */
download_status_failed(&consensus_dl_status[flav], status_code);
/* Retry immediately, if appropriate. */
update_consensus_networkstatus_downloads(time(NULL));
}
}
/** How long do we (as a cache) wait after a consensus becomes non-fresh
* before trying to fetch another? */
#define CONSENSUS_MIN_SECONDS_BEFORE_CACHING 120
/** Update the time at which we'll consider replacing the current
* consensus of flavor <b>flav</b> */
static void
update_consensus_networkstatus_fetch_time_impl(time_t now, int flav)
{
const or_options_t *options = get_options();
networkstatus_t *c = networkstatus_get_latest_consensus_by_flavor(flav);
const char *flavor = networkstatus_get_flavor_name(flav);
if (! we_want_to_fetch_flavor(get_options(), flav))
return;
if (c && c->valid_after <= now && now <= c->valid_until) {
long dl_interval;
long interval = c->fresh_until - c->valid_after;
long min_sec_before_caching = CONSENSUS_MIN_SECONDS_BEFORE_CACHING;
time_t start;
if (min_sec_before_caching > interval/16) {
/* Usually we allow 2-minutes slop factor in case clocks get
desynchronized a little. If we're on a private network with
a crazy-fast voting interval, though, 2 minutes may be too
much. */
min_sec_before_caching = interval/16;
}
if (directory_fetches_dir_info_early(options)) {
/* We want to cache the next one at some point after this one
* is no longer fresh... */
start = c->fresh_until + min_sec_before_caching;
/* Some clients may need the consensus sooner than others. */
if (options->FetchDirInfoExtraEarly || authdir_mode_v3(options)) {
dl_interval = 60;
if (min_sec_before_caching + dl_interval > interval)
dl_interval = interval/2;
} else {
/* But only in the first half-interval after that. */
dl_interval = interval/2;
}
} else {
/* We're an ordinary client or a bridge. Give all the caches enough
* time to download the consensus. */
start = c->fresh_until + (interval*3)/4;
/* But download the next one well before this one is expired. */
dl_interval = ((c->valid_until - start) * 7 )/ 8;
/* If we're a bridge user, make use of the numbers we just computed
* to choose the rest of the interval *after* them. */
if (directory_fetches_dir_info_later(options)) {
/* Give all the *clients* enough time to download the consensus. */
start = start + dl_interval + min_sec_before_caching;
/* But try to get it before ours actually expires. */
dl_interval = (c->valid_until - start) - min_sec_before_caching;
}
}
if (dl_interval < 1)
dl_interval = 1;
/* We must not try to replace c while it's still fresh: */
tor_assert(c->fresh_until < start);
/* We must download the next one before c is invalid: */
tor_assert(start+dl_interval < c->valid_until);
time_to_download_next_consensus[flav] =
start + crypto_rand_int((int)dl_interval);
{
char tbuf1[ISO_TIME_LEN+1];
char tbuf2[ISO_TIME_LEN+1];
char tbuf3[ISO_TIME_LEN+1];
format_local_iso_time(tbuf1, c->fresh_until);
format_local_iso_time(tbuf2, c->valid_until);
format_local_iso_time(tbuf3, time_to_download_next_consensus[flav]);
log_info(LD_DIR, "Live %s consensus %s the most recent until %s and "
"will expire at %s; fetching the next one at %s.",
flavor, (c->fresh_until > now) ? "will be" : "was",
tbuf1, tbuf2, tbuf3);
}
} else {
time_to_download_next_consensus[flav] = now;
log_info(LD_DIR, "No live %s consensus; we should fetch one immediately.",
flavor);
}
}
/** Update the time at which we'll consider replacing the current
* consensus of flavor 'flavor' */
void
update_consensus_networkstatus_fetch_time(time_t now)
{
int i;
for (i = 0; i < N_CONSENSUS_FLAVORS; ++i) {
if (we_want_to_fetch_flavor(get_options(), i))
update_consensus_networkstatus_fetch_time_impl(now, i);
}
}
/** 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(const or_options_t *options)
{
if (options->UseBridges && !any_bridge_descriptors_known()) {
log_info(LD_DIR, "delaying dir fetches (no running bridges known)");
return 1;
}
return 0;
}
/** Launch requests for networkstatus documents and authority certificates as
* appropriate. */
void
update_networkstatus_downloads(time_t now)
{
const or_options_t *options = get_options();
if (should_delay_dir_fetches(options))
return;
if (authdir_mode_any_main(options) || options->FetchV2Networkstatus)
update_v2_networkstatus_cache_downloads(now);
update_consensus_networkstatus_downloads(now);
update_certificate_downloads(now);
}
/** Launch requests as appropriate for missing directory authority
* certificates. */
void
update_certificate_downloads(time_t now)
{
int i;
for (i = 0; i < N_CONSENSUS_FLAVORS; ++i) {
if (consensus_waiting_for_certs[i].consensus)
authority_certs_fetch_missing(consensus_waiting_for_certs[i].consensus,
now);
}
if (current_ns_consensus)
authority_certs_fetch_missing(current_ns_consensus, now);
if (current_md_consensus)
authority_certs_fetch_missing(current_md_consensus, now);
}
/** Return 1 if we have a consensus but we don't have enough certificates
* to start using it yet. */
int
consensus_is_waiting_for_certs(void)
{
return consensus_waiting_for_certs[usable_consensus_flavor()].consensus
? 1 : 0;
}
/** Return the most recent consensus that we have downloaded, or NULL if we
* don't have one. */
networkstatus_t *
networkstatus_get_latest_consensus(void)
{
return current_consensus;
}
/** Return the latest consensus we have whose flavor matches <b>f</b>, or NULL
* if we don't have one. */
networkstatus_t *
networkstatus_get_latest_consensus_by_flavor(consensus_flavor_t f)
{
if (f == FLAV_NS)
return current_ns_consensus;
else if (f == FLAV_MICRODESC)
return current_md_consensus;
else {
tor_assert(0);
return NULL;
}
}
/** Return the most recent consensus that we have downloaded, or NULL if it is
* no longer live. */
networkstatus_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;
}
/* XXXX remove this in favor of get_live_consensus. But actually,
* leave something like it for bridge users, who need to not totally
* lose if they spend a while fetching a new consensus. */
/** As networkstatus_get_live_consensus(), but is way more tolerant of expired
* consensuses. */
networkstatus_t *
networkstatus_get_reasonably_live_consensus(time_t now, int flavor)
{
#define REASONABLY_LIVE_TIME (24*60*60)
networkstatus_t *consensus =
networkstatus_get_latest_consensus_by_flavor(flavor);
if (consensus &&
consensus->valid_after <= now &&
now <= consensus->valid_until+REASONABLY_LIVE_TIME)
return consensus;
else
return NULL;
}
/** Given two router status entries for the same router identity, return 1 if
* if the contents have changed between them. Otherwise, return 0. */
static int
routerstatus_has_changed(const routerstatus_t *a, const routerstatus_t *b)
{
tor_assert(tor_memeq(a->identity_digest, b->identity_digest, DIGEST_LEN));
return strcmp(a->nickname, b->nickname) ||
fast_memneq(a->descriptor_digest, b->descriptor_digest, DIGEST_LEN) ||
a->addr != b->addr ||
a->or_port != b->or_port ||
a->dir_port != b->dir_port ||
a->is_authority != b->is_authority ||
a->is_exit != b->is_exit ||
a->is_stable != b->is_stable ||
a->is_fast != b->is_fast ||
a->is_flagged_running != b->is_flagged_running ||
a->is_named != b->is_named ||
a->is_unnamed != b->is_unnamed ||
a->is_valid != b->is_valid ||
a->is_v2_dir != b->is_v2_dir ||
a->is_possible_guard != b->is_possible_guard ||
a->is_bad_exit != b->is_bad_exit ||
a->is_bad_directory != b->is_bad_directory ||
a->is_hs_dir != b->is_hs_dir ||
a->version_known != b->version_known;
}
/** Notify controllers of any router status entries that changed between
* <b>old_c</b> and <b>new_c</b>. */
static void
notify_control_networkstatus_changed(const networkstatus_t *old_c,
const networkstatus_t *new_c)
{
smartlist_t *changed;
if (old_c == new_c)
return;
/* tell the controller exactly which relays are still listed, as well
* as what they're listed as */
control_event_newconsensus(new_c);
if (!control_event_is_interesting(EVENT_NS))
return;
if (!old_c) {
control_event_networkstatus_changed(new_c->routerstatus_list);
return;
}
changed = smartlist_new();
SMARTLIST_FOREACH_JOIN(
old_c->routerstatus_list, const routerstatus_t *, rs_old,
new_c->routerstatus_list, const routerstatus_t *, rs_new,
tor_memcmp(rs_old->identity_digest,
rs_new->identity_digest, DIGEST_LEN),
smartlist_add(changed, (void*) rs_new)) {
if (routerstatus_has_changed(rs_old, rs_new))
smartlist_add(changed, (void*)rs_new);
} SMARTLIST_FOREACH_JOIN_END(rs_old, rs_new);
control_event_networkstatus_changed(changed);
smartlist_free(changed);
}
/** Copy all the ancillary information (like router download status and so on)
* from <b>old_c</b> to <b>new_c</b>. */
static void
networkstatus_copy_old_consensus_info(networkstatus_t *new_c,
const networkstatus_t *old_c)
{
if (old_c == new_c)
return;
if (!old_c || !smartlist_len(old_c->routerstatus_list))
return;
SMARTLIST_FOREACH_JOIN(old_c->routerstatus_list, routerstatus_t *, rs_old,
new_c->routerstatus_list, routerstatus_t *, rs_new,
tor_memcmp(rs_old->identity_digest,
rs_new->identity_digest, DIGEST_LEN),
STMT_NIL) {
/* Okay, so we're looking at the same identity. */
rs_new->last_dir_503_at = rs_old->last_dir_503_at;
if (tor_memeq(rs_old->descriptor_digest, rs_new->descriptor_digest,
DIGEST_LEN)) {
/* And the same descriptor too! */
memcpy(&rs_new->dl_status, &rs_old->dl_status,sizeof(download_status_t));
}
} SMARTLIST_FOREACH_JOIN_END(rs_old, rs_new);
}
/** 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.
*
* If flags & NSSET_FROM_CACHE, this networkstatus has come from the disk
* cache. If flags & NSSET_WAS_WAITING_FOR_CERTS, this networkstatus was
* already received, but we were waiting for certificates on it. If flags &
* NSSET_DONT_DOWNLOAD_CERTS, do not launch certificate downloads as needed.
* If flags & NSSET_ACCEPT_OBSOLETE, then we should be willing to take this
* consensus, even if it comes from many days in the past.
*
* Return 0 on success, <0 on failure. On failure, caller should increment
* the failure count as appropriate.
*
* We return -1 for mild failures that don't need to be reported to the
* user, and -2 for more serious problems.
*/
int
networkstatus_set_current_consensus(const char *consensus,
const char *flavor,
unsigned flags)
{
networkstatus_t *c=NULL;
int r, result = -1;
time_t now = time(NULL);
const or_options_t *options = get_options();
char *unverified_fname = NULL, *consensus_fname = NULL;
int flav = networkstatus_parse_flavor_name(flavor);
const unsigned from_cache = flags & NSSET_FROM_CACHE;
const unsigned was_waiting_for_certs = flags & NSSET_WAS_WAITING_FOR_CERTS;
const unsigned dl_certs = !(flags & NSSET_DONT_DOWNLOAD_CERTS);
const unsigned accept_obsolete = flags & NSSET_ACCEPT_OBSOLETE;
const unsigned require_flavor = flags & NSSET_REQUIRE_FLAVOR;
const digests_t *current_digests = NULL;
consensus_waiting_for_certs_t *waiting = NULL;
time_t current_valid_after = 0;
int free_consensus = 1; /* Free 'c' at the end of the function */
int old_ewma_enabled;
if (flav < 0) {
/* XXXX we don't handle unrecognized flavors yet. */
log_warn(LD_BUG, "Unrecognized consensus flavor %s", flavor);
return -2;
}
/* Make sure it's parseable. */
c = networkstatus_parse_vote_from_string(consensus, NULL, NS_TYPE_CONSENSUS);
if (!c) {
log_warn(LD_DIR, "Unable to parse networkstatus consensus");
result = -2;
goto done;
}
if ((int)c->flavor != flav) {
/* This wasn't the flavor we thought we were getting. */
if (require_flavor) {
log_warn(LD_DIR, "Got consensus with unexpected flavor %s (wanted %s)",
networkstatus_get_flavor_name(c->flavor), flavor);
goto done;
}
flav = c->flavor;
flavor = networkstatus_get_flavor_name(flav);
}
if (flav != usable_consensus_flavor() &&
!directory_caches_dir_info(options)) {
/* This consensus is totally boring to us: we won't use it, and we won't
* serve it. Drop it. */
goto done;
}
if (from_cache && !accept_obsolete &&
c->valid_until < now-OLD_ROUTER_DESC_MAX_AGE) {
log_info(LD_DIR, "Loaded an expired consensus. Discarding.");
goto done;
}
if (!strcmp(flavor, "ns")) {
consensus_fname = get_datadir_fname("cached-consensus");
unverified_fname = get_datadir_fname("unverified-consensus");
if (current_ns_consensus) {
current_digests = &current_ns_consensus->digests;
current_valid_after = current_ns_consensus->valid_after;
}
} else if (!strcmp(flavor, "microdesc")) {
consensus_fname = get_datadir_fname("cached-microdesc-consensus");
unverified_fname = get_datadir_fname("unverified-microdesc-consensus");
if (current_md_consensus) {
current_digests = &current_md_consensus->digests;
current_valid_after = current_md_consensus->valid_after;
}
} else {
cached_dir_t *cur;
char buf[128];
tor_snprintf(buf, sizeof(buf), "cached-%s-consensus", flavor);
consensus_fname = get_datadir_fname(buf);
tor_snprintf(buf, sizeof(buf), "unverified-%s-consensus", flavor);
unverified_fname = get_datadir_fname(buf);
cur = dirserv_get_consensus(flavor);
if (cur) {
current_digests = &cur->digests;
current_valid_after = cur->published;
}
}
if (current_digests &&
tor_memeq(&c->digests, current_digests, sizeof(c->digests))) {
/* We already have this one. That's a failure. */
log_info(LD_DIR, "Got a %s consensus we already have", flavor);
goto done;
}
if (current_valid_after && c->valid_after <= current_valid_after) {
/* We have a newer one. There's no point in accepting this one,
* even if it's great. */
log_info(LD_DIR, "Got a %s consensus at least as old as the one we have",
flavor);
goto done;
}
/* Make sure it's signed enough. */
if ((r=networkstatus_check_consensus_signature(c, 1))<0) {
if (r == -1) {
/* Okay, so it _might_ be signed enough if we get more certificates. */
if (!was_waiting_for_certs) {
log_info(LD_DIR,
"Not enough certificates to check networkstatus consensus");
}
if (!current_valid_after ||
c->valid_after > current_valid_after) {
waiting = &consensus_waiting_for_certs[flav];
networkstatus_vote_free(waiting->consensus);
tor_free(waiting->body);
waiting->consensus = c;
free_consensus = 0;
waiting->body = tor_strdup(consensus);
waiting->set_at = now;
waiting->dl_failed = 0;
if (!from_cache) {
write_str_to_file(unverified_fname, consensus, 0);
}
if (dl_certs)
authority_certs_fetch_missing(c, now);
/* This case is not a success or a failure until we get the certs
* or fail to get the certs. */
result = 0;
} else {
/* Even if we had enough signatures, we'd never use this as the
* latest consensus. */
if (was_waiting_for_certs && from_cache)
unlink(unverified_fname);
}
goto done;
} else {
/* This can never be signed enough: Kill it. */
if (!was_waiting_for_certs) {
log_warn(LD_DIR, "Not enough good signatures on networkstatus "
"consensus");
result = -2;
}
if (was_waiting_for_certs && (r < -1) && from_cache)
unlink(unverified_fname);
goto done;
}
}
if (!from_cache && flav == usable_consensus_flavor())
control_event_client_status(LOG_NOTICE, "CONSENSUS_ARRIVED");
/* Are we missing any certificates at all? */
if (r != 1 && dl_certs)
authority_certs_fetch_missing(c, now);
if (flav == usable_consensus_flavor()) {
notify_control_networkstatus_changed(current_consensus, c);
}
if (flav == FLAV_NS) {
if (current_ns_consensus) {
networkstatus_copy_old_consensus_info(c, current_ns_consensus);
networkstatus_vote_free(current_ns_consensus);
/* Defensive programming : we should set current_consensus very soon,
* but we're about to call some stuff in the meantime, and leaving this
* dangling pointer around has proven to be trouble. */
current_ns_consensus = NULL;
}
current_ns_consensus = c;
free_consensus = 0; /* avoid free */
} else if (flav == FLAV_MICRODESC) {
if (current_md_consensus) {
networkstatus_copy_old_consensus_info(c, current_md_consensus);
networkstatus_vote_free(current_md_consensus);
/* more defensive programming */
current_md_consensus = NULL;
}
current_md_consensus = c;
free_consensus = 0; /* avoid free */
}
waiting = &consensus_waiting_for_certs[flav];
if (waiting->consensus &&
waiting->consensus->valid_after <= c->valid_after) {
networkstatus_vote_free(waiting->consensus);
waiting->consensus = NULL;
if (consensus != waiting->body)
tor_free(waiting->body);
else
waiting->body = NULL;
waiting->set_at = 0;
waiting->dl_failed = 0;
unlink(unverified_fname);
}
/* Reset the failure count only if this consensus is actually valid. */
if (c->valid_after <= now && now <= c->valid_until) {
download_status_reset(&consensus_dl_status[flav]);
} else {
if (!from_cache)
download_status_failed(&consensus_dl_status[flav], 0);
}
if (flav == usable_consensus_flavor()) {
/* XXXXNM Microdescs: needs a non-ns variant. ???? NM*/
update_consensus_networkstatus_fetch_time(now);
nodelist_set_consensus(current_consensus);
dirvote_recalculate_timing(options, now);
routerstatus_list_update_named_server_map();
/* Update ewma and adjust policy if needed; first cache the old value */
old_ewma_enabled = cell_ewma_enabled();
/* Change the cell EWMA settings */
cell_ewma_set_scale_factor(options, networkstatus_get_latest_consensus());
/* If we just enabled ewma, set the cmux policy on all active channels */
if (cell_ewma_enabled() && !old_ewma_enabled) {
channel_set_cmux_policy_everywhere(&ewma_policy);
} else if (!cell_ewma_enabled() && old_ewma_enabled) {
/* Turn it off everywhere */
channel_set_cmux_policy_everywhere(NULL);
}
/* XXXX024 this call might be unnecessary here: can changing the
* current consensus really alter our view of any OR's rate limits? */
connection_or_update_token_buckets(get_connection_array(), options);
circuit_build_times_new_consensus_params(&circ_times, current_consensus);
}
if (directory_caches_dir_info(options)) {
dirserv_set_cached_consensus_networkstatus(consensus,
flavor,
&c->digests,
c->valid_after);
}
if (!from_cache) {
write_str_to_file(consensus_fname, consensus, 0);
}
/** If a consensus appears more than this many seconds before its declared
* valid-after time, declare that our clock is skewed. */
#define EARLY_CONSENSUS_NOTICE_SKEW 60
if (now < c->valid_after - EARLY_CONSENSUS_NOTICE_SKEW) {
char tbuf[ISO_TIME_LEN+1];
char dbuf[64];
long delta = now - c->valid_after;
format_iso_time(tbuf, c->valid_after);
format_time_interval(dbuf, sizeof(dbuf), delta);
log_warn(LD_GENERAL, "Our clock is %s behind the time published in the "
"consensus network status document (%s UTC). Tor needs an "
"accurate clock to work correctly. Please check your time and "
"date settings!", dbuf, tbuf);
control_event_general_status(LOG_WARN,
"CLOCK_SKEW MIN_SKEW=%ld SOURCE=CONSENSUS", delta);
}
router_dir_info_changed();
result = 0;
done:
if (free_consensus)
networkstatus_vote_free(c);
tor_free(consensus_fname);
tor_free(unverified_fname);
return result;
}
/** Called when we have gotten more certificates: see whether we can
* now verify a pending consensus. */
void
networkstatus_note_certs_arrived(void)
{
int i;
for (i=0; i<N_CONSENSUS_FLAVORS; ++i) {
consensus_waiting_for_certs_t *waiting = &consensus_waiting_for_certs[i];
if (!waiting->consensus)
continue;
if (networkstatus_check_consensus_signature(waiting->consensus, 0)>=0) {
char *waiting_body = waiting->body;
if (!networkstatus_set_current_consensus(
waiting_body,
networkstatus_get_flavor_name(i),
NSSET_WAS_WAITING_FOR_CERTS)) {
tor_free(waiting_body);
}
}
}
}
/** 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. If <b>dir_version</b> is 2, it's a v2 networkstatus that changed.
* If <b>dir_version</b> is 3, it's a v3 consensus that changed.
*/
void
routers_update_all_from_networkstatus(time_t now, int dir_version)
{
routerlist_t *rl = router_get_routerlist();
networkstatus_t *consensus = networkstatus_get_reasonably_live_consensus(now,
FLAV_NS);
if (networkstatus_v2_list_has_changed)
download_status_map_update_from_v2_networkstatus();
if (!consensus || dir_version < 3) /* nothing more we should do */
return;
/* calls router_dir_info_changed() when it's done -- more routers
* might be up or down now, which might affect whether there's enough
* directory info. */
routers_update_status_from_consensus_networkstatus(rl->routers, 0);
SMARTLIST_FOREACH(rl->routers, routerinfo_t *, ri,
ri->cache_info.routerlist_index = ri_sl_idx);
if (rl->old_routers)
signed_descs_update_status_from_consensus_networkstatus(rl->old_routers);
if (!have_warned_about_old_version) {
int is_server = server_mode(get_options());
version_status_t status;
const char *recommended = is_server ?
consensus->server_versions : consensus->client_versions;
status = tor_version_is_obsolete(VERSION, recommended);
if (status == VS_RECOMMENDED) {
log_info(LD_GENERAL, "The directory authorities say my version is ok.");
} else if (status == VS_EMPTY) {
log_info(LD_GENERAL,
"The directory authorities don't recommend any versions.");
} else if (status == VS_NEW || status == 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 the directory "
"authorities. Recommended versions are: %s",
VERSION,
status == VS_NEW_IN_SERIES ? " in its series" : "",
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 the directory "
"authorities. Recommended versions are: %s",
VERSION,
status == VS_OLD ? "obsolete" : "not recommended",
recommended);
have_warned_about_old_version = 1;
control_event_general_status(LOG_WARN, "DANGEROUS_VERSION "
"CURRENT=%s REASON=%s RECOMMENDED=\"%s\"",
VERSION, status == VS_OLD ? "OBSOLETE" : "UNRECOMMENDED",
recommended);
}
}
}
/** Update v2_download_status_map to contain an entry for every router
* descriptor listed in the v2 networkstatuses. */
static void
download_status_map_update_from_v2_networkstatus(void)
{
digestmap_t *dl_status;
if (!networkstatus_v2_list)
return;
if (!v2_download_status_map)
v2_download_status_map = digestmap_new();
dl_status = digestmap_new();
SMARTLIST_FOREACH_BEGIN(networkstatus_v2_list, networkstatus_v2_t *, ns) {
SMARTLIST_FOREACH_BEGIN(ns->entries, const routerstatus_t *, rs) {
const char *d = rs->descriptor_digest;
download_status_t *s;
if (digestmap_get(dl_status, d))
continue;
if (!(s = digestmap_remove(v2_download_status_map, d))) {
s = tor_malloc_zero(sizeof(download_status_t));
}
digestmap_set(dl_status, d, s);
} SMARTLIST_FOREACH_END(rs);
} SMARTLIST_FOREACH_END(ns);
digestmap_free(v2_download_status_map, tor_free_);
v2_download_status_map = dl_status;
networkstatus_v2_list_has_changed = 0;
}
/** Update our view of the list of named servers from the most recently
* retrieved networkstatus consensus. */
static void
routerstatus_list_update_named_server_map(void)
{
if (!current_consensus)
return;
strmap_free(named_server_map, tor_free_);
named_server_map = strmap_new();
strmap_free(unnamed_server_map, NULL);
unnamed_server_map = strmap_new();
SMARTLIST_FOREACH_BEGIN(current_consensus->routerstatus_list,
const routerstatus_t *, rs) {
if (rs->is_named) {
strmap_set_lc(named_server_map, rs->nickname,
tor_memdup(rs->identity_digest, DIGEST_LEN));
}
if (rs->is_unnamed) {
strmap_set_lc(unnamed_server_map, rs->nickname, (void*)1);
}
} SMARTLIST_FOREACH_END(rs);
}
/** Given a list <b>routers</b> of routerinfo_t *, update each status field
* according to our current consensus networkstatus. May re-order
* <b>routers</b>. */
void
routers_update_status_from_consensus_networkstatus(smartlist_t *routers,
int reset_failures)
{
dir_server_t *ds;
const or_options_t *options = get_options();
int authdir = authdir_mode_v2(options) || authdir_mode_v3(options);
networkstatus_t *ns = current_consensus;
if (!ns || !smartlist_len(ns->routerstatus_list))
return;
if (!networkstatus_v2_list)
networkstatus_v2_list = smartlist_new();
routers_sort_by_identity(routers);
SMARTLIST_FOREACH_JOIN(ns->routerstatus_list, routerstatus_t *, rs,
routers, routerinfo_t *, router,
tor_memcmp(rs->identity_digest,
router->cache_info.identity_digest, DIGEST_LEN),
{
}) {
/* We have a routerstatus for this router. */
const char *digest = router->cache_info.identity_digest;
ds = router_get_fallback_dirserver_by_digest(digest);
/* Is it the same descriptor, or only the same identity? */
if (tor_memeq(router->cache_info.signed_descriptor_digest,
rs->descriptor_digest, DIGEST_LEN)) {
if (ns->valid_until > router->cache_info.last_listed_as_valid_until)
router->cache_info.last_listed_as_valid_until = ns->valid_until;
}
if (authdir) {
/* If we _are_ an authority, we should check whether this router
* is one that will cause us to need a reachability test. */
routerinfo_t *old_router =
router_get_mutable_by_digest(router->cache_info.identity_digest);
if (old_router != router) {
router->needs_retest_if_added =
dirserv_should_launch_reachability_test(router, old_router);
}
}
if (rs->is_flagged_running && ds) {
download_status_reset(&ds->v2_ns_dl_status);
}
if (reset_failures) {
download_status_reset(&rs->dl_status);
}
} SMARTLIST_FOREACH_JOIN_END(rs, router);
/* Now update last_listed_as_valid_until from v2 networkstatuses. */
SMARTLIST_FOREACH_BEGIN(networkstatus_v2_list, networkstatus_v2_t *, ns) {
time_t live_until = ns->published_on + V2_NETWORKSTATUS_ROUTER_LIFETIME;
SMARTLIST_FOREACH_JOIN(ns->entries, const routerstatus_t *, rs,
routers, routerinfo_t *, ri,
tor_memcmp(rs->identity_digest,
ri->cache_info.identity_digest, DIGEST_LEN),
STMT_NIL) {
if (tor_memeq(ri->cache_info.signed_descriptor_digest,
rs->descriptor_digest, DIGEST_LEN)) {
if (live_until > ri->cache_info.last_listed_as_valid_until)
ri->cache_info.last_listed_as_valid_until = live_until;
}
} SMARTLIST_FOREACH_JOIN_END(rs, ri);
} SMARTLIST_FOREACH_END(ns);
router_dir_info_changed();
}
/** Given a list of signed_descriptor_t, update their fields (mainly, when
* they were last listed) from the most recent consensus. */
void
signed_descs_update_status_from_consensus_networkstatus(smartlist_t *descs)
{
networkstatus_t *ns = current_ns_consensus;
if (!ns)
return;
if (!ns->desc_digest_map) {
char dummy[DIGEST_LEN];
/* instantiates the digest map. */
memset(dummy, 0, sizeof(dummy));
router_get_consensus_status_by_descriptor_digest(ns, dummy);
}
SMARTLIST_FOREACH(descs, signed_descriptor_t *, d,
{
const routerstatus_t *rs = digestmap_get(ns->desc_digest_map,
d->signed_descriptor_digest);
if (rs) {
if (ns->valid_until > d->last_listed_as_valid_until)
d->last_listed_as_valid_until = ns->valid_until;
}
});
}
/** 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(const routerstatus_t *rs)
{
return routerstatus_format_entry(rs, NULL, NS_CONTROL_PORT, NULL);
}
/** Alloc and return a string describing routerstatuses for the most
* recent info of each router we know about that is of purpose
* <b>purpose_string</b>. Return NULL if unrecognized purpose.
*
* Right now this function is oriented toward listing bridges (you
* shouldn't use this for general-purpose routers, since those
* should be listed from the consensus, not from the routers list). */
char *
networkstatus_getinfo_by_purpose(const char *purpose_string, time_t now)
{
time_t cutoff = now - ROUTER_MAX_AGE_TO_PUBLISH;
char *answer;
routerlist_t *rl = router_get_routerlist();
smartlist_t *statuses;
uint8_t purpose = router_purpose_from_string(purpose_string);
routerstatus_t rs;
int bridge_auth = authdir_mode_bridge(get_options());
if (purpose == ROUTER_PURPOSE_UNKNOWN) {
log_info(LD_DIR, "Unrecognized purpose '%s' when listing router statuses.",
purpose_string);
return NULL;
}
statuses = smartlist_new();
SMARTLIST_FOREACH_BEGIN(rl->routers, routerinfo_t *, ri) {
node_t *node = node_get_mutable_by_id(ri->cache_info.identity_digest);
if (!node)
continue;
if (ri->cache_info.published_on < cutoff)
continue;
if (ri->purpose != purpose)
continue;
if (bridge_auth && ri->purpose == ROUTER_PURPOSE_BRIDGE)
dirserv_set_router_is_running(ri, now);
/* then generate and write out status lines for each of them */
set_routerstatus_from_routerinfo(&rs, node, ri, now, 0, 0, 0, 0);
smartlist_add(statuses, networkstatus_getinfo_helper_single(&rs));
} SMARTLIST_FOREACH_END(ri);
answer = smartlist_join_strings(statuses, "", 0, NULL);
SMARTLIST_FOREACH(statuses, char *, cp, tor_free(cp));
smartlist_free(statuses);
return answer;
}
/** Write out router status entries for all our bridge descriptors. */
void
networkstatus_dump_bridge_status_to_file(time_t now)
{
char *status = networkstatus_getinfo_by_purpose("bridge", now);
const or_options_t *options = get_options();
char *fname = NULL;
tor_asprintf(&fname, "%s"PATH_SEPARATOR"networkstatus-bridges",
options->DataDirectory);
write_str_to_file(fname,status,0);
tor_free(fname);
tor_free(status);
}
/* DOCDOC get_net_param_from_list */
static int32_t
get_net_param_from_list(smartlist_t *net_params, const char *param_name,
int32_t default_val, int32_t min_val, int32_t max_val)
{
int32_t res = default_val;
size_t name_len = strlen(param_name);
tor_assert(max_val > min_val);
tor_assert(min_val <= default_val);
tor_assert(max_val >= default_val);
SMARTLIST_FOREACH_BEGIN(net_params, const char *, p) {
if (!strcmpstart(p, param_name) && p[name_len] == '=') {
int ok=0;
long v = tor_parse_long(p+name_len+1, 10, INT32_MIN,
INT32_MAX, &ok, NULL);
if (ok) {
res = (int32_t) v;
break;
}
}
} SMARTLIST_FOREACH_END(p);
if (res < min_val) {
log_warn(LD_DIR, "Consensus parameter %s is too small. Got %d, raising to "
"%d.", param_name, res, min_val);
res = min_val;
} else if (res > max_val) {
log_warn(LD_DIR, "Consensus parameter %s is too large. Got %d, capping to "
"%d.", param_name, res, max_val);
res = max_val;
}
return res;
}
/** Return the value of a integer parameter from the networkstatus <b>ns</b>
* whose name is <b>param_name</b>. If <b>ns</b> is NULL, try loading the
* latest consensus ourselves. Return <b>default_val</b> if no latest
* consensus, or if it has no parameter called <b>param_name</b>.
* Make sure the value parsed from the consensus is at least
* <b>min_val</b> and at most <b>max_val</b> and raise/cap the parsed value
* if necessary. */
int32_t
networkstatus_get_param(const networkstatus_t *ns, const char *param_name,
int32_t default_val, int32_t min_val, int32_t max_val)
{
if (!ns) /* if they pass in null, go find it ourselves */
ns = networkstatus_get_latest_consensus();
if (!ns || !ns->net_params)
return default_val;
return get_net_param_from_list(ns->net_params, param_name,
default_val, min_val, max_val);
}
/**
* Retrieve the consensus parameter that governs the
* fixed-point precision of our network balancing 'bandwidth-weights'
* (which are themselves integer consensus values). We divide them
* by this value and ensure they never exceed this value.
*/
int
networkstatus_get_weight_scale_param(networkstatus_t *ns)
{
return networkstatus_get_param(ns, "bwweightscale",
BW_WEIGHT_SCALE,
BW_MIN_WEIGHT_SCALE,
BW_MAX_WEIGHT_SCALE);
}
/** Return the value of a integer bw weight parameter from the networkstatus
* <b>ns</b> whose name is <b>weight_name</b>. If <b>ns</b> is NULL, try
* loading the latest consensus ourselves. Return <b>default_val</b> if no
* latest consensus, or if it has no parameter called <b>weight_name</b>. */
int32_t
networkstatus_get_bw_weight(networkstatus_t *ns, const char *weight_name,
int32_t default_val)
{
int32_t param;
int max;
if (!ns) /* if they pass in null, go find it ourselves */
ns = networkstatus_get_latest_consensus();
if (!ns || !ns->weight_params)
return default_val;
max = networkstatus_get_weight_scale_param(ns);
param = get_net_param_from_list(ns->weight_params, weight_name,
default_val, -1,
BW_MAX_WEIGHT_SCALE);
if (param > max) {
log_warn(LD_DIR, "Value of consensus weight %s was too large, capping "
"to %d", weight_name, max);
param = max;
}
return param;
}
/** Return the name of the consensus flavor <b>flav</b> as used to identify
* the flavor in directory documents. */
const char *
networkstatus_get_flavor_name(consensus_flavor_t flav)
{
switch (flav) {
case FLAV_NS:
return "ns";
case FLAV_MICRODESC:
return "microdesc";
default:
tor_fragile_assert();
return "??";
}
}
/** Return the consensus_flavor_t value for the flavor called <b>flavname</b>,
* or -1 if the flavor is not recognized. */
int
networkstatus_parse_flavor_name(const char *flavname)
{
if (!strcmp(flavname, "ns"))
return FLAV_NS;
else if (!strcmp(flavname, "microdesc"))
return FLAV_MICRODESC;
else
return -1;
}
/** Return 0 if this routerstatus is obsolete, too new, isn't
* running, or otherwise not a descriptor that we would make any
* use of even if we had it. Else return 1. */
int
client_would_use_router(const routerstatus_t *rs, time_t now,
const or_options_t *options)
{
if (!rs->is_flagged_running && !options->FetchUselessDescriptors) {
/* If we had this router descriptor, we wouldn't even bother using it.
* But, if we want to have a complete list, fetch it anyway. */
return 0;
}
if (rs->published_on + options->TestingEstimatedDescriptorPropagationTime
> now) {
/* Most caches probably don't have this descriptor yet. */
return 0;
}
if (rs->published_on + OLD_ROUTER_DESC_MAX_AGE < now) {
/* We'd drop it immediately for being too old. */
return 0;
}
return 1;
}
/** 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,
const char **errmsg)
{
const routerstatus_t *status;
(void) conn;
if (!current_consensus) {
*answer = tor_strdup("");
return 0;
}
if (!strcmp(question, "ns/all")) {
smartlist_t *statuses = smartlist_new();
SMARTLIST_FOREACH(current_consensus->routerstatus_list,
const 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];
const char *q = question + 6;
if (*q == '$')
++q;
if (base16_decode(d, DIGEST_LEN, q, strlen(q))) {
*errmsg = "Data not decodeable as hex";
return -1;
}
status = router_get_consensus_status_by_id(d);
} else if (!strcmpstart(question, "ns/name/")) {
status = router_get_consensus_status_by_nickname(question+8, 0);
} else if (!strcmpstart(question, "ns/purpose/")) {
*answer = networkstatus_getinfo_by_purpose(question+11, time(NULL));
return *answer ? 0 : -1;
} else {
return 0;
}
if (status)
*answer = networkstatus_getinfo_helper_single(status);
return 0;
}
/** Free all storage held locally in this module. */
void
networkstatus_free_all(void)
{
int i;
if (networkstatus_v2_list) {
SMARTLIST_FOREACH(networkstatus_v2_list, networkstatus_v2_t *, ns,
networkstatus_v2_free(ns));
smartlist_free(networkstatus_v2_list);
networkstatus_v2_list = NULL;
}
digestmap_free(v2_download_status_map, tor_free_);
v2_download_status_map = NULL;
networkstatus_vote_free(current_ns_consensus);
networkstatus_vote_free(current_md_consensus);
current_md_consensus = current_ns_consensus = NULL;
for (i=0; i < N_CONSENSUS_FLAVORS; ++i) {
consensus_waiting_for_certs_t *waiting = &consensus_waiting_for_certs[i];
if (waiting->consensus) {
networkstatus_vote_free(waiting->consensus);
waiting->consensus = NULL;
}
tor_free(waiting->body);
}
strmap_free(named_server_map, tor_free_);
strmap_free(unnamed_server_map, NULL);
}
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