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tor/src/or/routerlist.c

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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) 2007-2017, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file routerlist.c
* \brief Code to
* maintain and access the global list of routerinfos for known
* servers.
*
* A "routerinfo_t" object represents a single self-signed router
* descriptor, as generated by a Tor relay in order to tell the rest of
* the world about its keys, address, and capabilities. An
* "extrainfo_t" object represents an adjunct "extra-info" object,
* certified by a corresponding router descriptor, reporting more
* information about the relay that nearly all users will not need.
*
* Most users will not use router descriptors for most relays. Instead,
* they use the information in microdescriptors and in the consensus
* networkstatus.
*
* Right now, routerinfo_t objects are used in these ways:
* <ul>
* <li>By clients, in order to learn about bridge keys and capabilities.
* (Bridges aren't listed in the consensus networkstatus, so they
* can't have microdescriptors.)
* <li>By relays, since relays want more information about other relays
* than they can learn from microdescriptors. (TODO: Is this still true?)
* <li>By authorities, which receive them and use them to generate the
* consensus and the microdescriptors.
* <li>By all directory caches, which download them in case somebody
* else wants them.
* </ul>
*
* Routerinfos are mostly created by parsing them from a string, in
* routerparse.c. We store them to disk on receiving them, and
* periodically discard the ones we don't need. On restarting, we
* re-read them from disk. (This also applies to extrainfo documents, if
* we are configured to fetch them.)
*
* In order to keep our list of routerinfos up-to-date, we periodically
* check whether there are any listed in the latest consensus (or in the
* votes from other authorities, if we are an authority) that we don't
* have. (This also applies to extrainfo documents, if we are
* configured to fetch them.)
*
* Almost nothing in Tor should use a routerinfo_t to refer directly to
* a relay; instead, almost everything should use node_t (implemented in
* nodelist.c), which provides a common interface to routerinfo_t,
* routerstatus_t, and microdescriptor_t.
*
* <br>
*
* This module also has some of the functions used for choosing random
* nodes according to different rules and weights. Historically, they
* were all in this module. Now, they are spread across this module,
* nodelist.c, and networkstatus.c. (TODO: Fix that.)
*
* <br>
*
* (For historical reasons) this module also contains code for handling
* the list of fallback directories, the list of directory authorities,
* and the list of authority certificates.
*
* For the directory authorities, we have a list containing the public
* identity key, and contact points, for each authority. The
* authorities receive descriptors from relays, and publish consensuses,
* descriptors, and microdescriptors. This list is pre-configured.
*
* Fallback directories are well-known, stable, but untrusted directory
* caches that clients which have not yet bootstrapped can use to get
* their first networkstatus consensus, in order to find out where the
* Tor network really is. This list is pre-configured in
* fallback_dirs.inc. Every authority also serves as a fallback.
*
* Both fallback directories and directory authorities are are
* represented by a dir_server_t.
*
* Authority certificates are signed with authority identity keys; they
* are used to authenticate shorter-term authority signing keys. We
* fetch them when we find a consensus or a vote that has been signed
* with a signing key we don't recognize. We cache them on disk and
* load them on startup. Authority operators generate them with the
* "tor-gencert" utility.
*
* TODO: Authority certificates should be a separate module.
*
* TODO: dir_server_t stuff should be in a separate module.
**/
#define ROUTERLIST_PRIVATE
#include "or.h"
#include "backtrace.h"
#include "bridges.h"
#include "crypto_ed25519.h"
#include "circuitstats.h"
#include "config.h"
#include "connection.h"
#include "control.h"
#include "crypto_rand.h"
#include "directory.h"
#include "dirserv.h"
#include "entrynodes.h"
#include "fp_pair.h"
#include "geoip.h"
#include "hibernate.h"
#include "main.h"
#include "microdesc.h"
#include "networkstatus.h"
#include "nodelist.h"
#include "policies.h"
#include "reasons.h"
#include "rendcommon.h"
#include "rendservice.h"
#include "rephist.h"
#include "router.h"
#include "routerlist.h"
#include "routerparse.h"
#include "routerset.h"
#include "sandbox.h"
#include "torcert.h"
#include "dirauth/dirvote.h"
#include "dirauth/mode.h"
// #define DEBUG_ROUTERLIST
/****************************************************************************/
/* Typed wrappers for different digestmap types; used to avoid type
* confusion. */
DECLARE_TYPED_DIGESTMAP_FNS(sdmap_, digest_sd_map_t, signed_descriptor_t)
DECLARE_TYPED_DIGESTMAP_FNS(rimap_, digest_ri_map_t, routerinfo_t)
DECLARE_TYPED_DIGESTMAP_FNS(eimap_, digest_ei_map_t, extrainfo_t)
DECLARE_TYPED_DIGESTMAP_FNS(dsmap_, digest_ds_map_t, download_status_t)
#define SDMAP_FOREACH(map, keyvar, valvar) \
DIGESTMAP_FOREACH(sdmap_to_digestmap(map), keyvar, signed_descriptor_t *, \
valvar)
#define RIMAP_FOREACH(map, keyvar, valvar) \
DIGESTMAP_FOREACH(rimap_to_digestmap(map), keyvar, routerinfo_t *, valvar)
#define EIMAP_FOREACH(map, keyvar, valvar) \
DIGESTMAP_FOREACH(eimap_to_digestmap(map), keyvar, extrainfo_t *, valvar)
#define DSMAP_FOREACH(map, keyvar, valvar) \
DIGESTMAP_FOREACH(dsmap_to_digestmap(map), keyvar, download_status_t *, \
valvar)
#define eimap_free(map, fn) MAP_FREE_AND_NULL(eimap, (map), (fn))
#define rimap_free(map, fn) MAP_FREE_AND_NULL(rimap, (map), (fn))
#define dsmap_free(map, fn) MAP_FREE_AND_NULL(dsmap, (map), (fn))
#define sdmap_free(map, fn) MAP_FREE_AND_NULL(sdmap, (map), (fn))
/* Forward declaration for cert_list_t */
typedef struct cert_list_t cert_list_t;
/* static function prototypes */
static int compute_weighted_bandwidths(const smartlist_t *sl,
bandwidth_weight_rule_t rule,
double **bandwidths_out,
double *total_bandwidth_out);
static const routerstatus_t *router_pick_trusteddirserver_impl(
const smartlist_t *sourcelist, dirinfo_type_t auth,
int flags, int *n_busy_out);
static const routerstatus_t *router_pick_dirserver_generic(
smartlist_t *sourcelist,
dirinfo_type_t type, int flags);
static void mark_all_dirservers_up(smartlist_t *server_list);
static int signed_desc_digest_is_recognized(signed_descriptor_t *desc);
static const char *signed_descriptor_get_body_impl(
const signed_descriptor_t *desc,
int with_annotations);
static void list_pending_downloads(digestmap_t *result,
digest256map_t *result256,
int purpose, const char *prefix);
static void list_pending_fpsk_downloads(fp_pair_map_t *result);
static void launch_dummy_descriptor_download_as_needed(time_t now,
const or_options_t *options);
static void download_status_reset_by_sk_in_cl(cert_list_t *cl,
const char *digest);
static int download_status_is_ready_by_sk_in_cl(cert_list_t *cl,
const char *digest,
time_t now);
/****************************************************************************/
/** Global list of a dir_server_t object for each directory
* authority. */
static smartlist_t *trusted_dir_servers = NULL;
/** Global list of dir_server_t objects for all directory authorities
* and all fallback directory servers. */
static smartlist_t *fallback_dir_servers = NULL;
/** List of certificates for a single authority, and download status for
* latest certificate.
*/
struct cert_list_t {
/*
* The keys of download status map are cert->signing_key_digest for pending
* downloads by (identity digest/signing key digest) pair; functions such
* as authority_cert_get_by_digest() already assume these are unique.
*/
struct digest_ds_map_t *dl_status_map;
/* There is also a dlstatus for the download by identity key only */
download_status_t dl_status_by_id;
smartlist_t *certs;
};
/** Map from v3 identity key digest to cert_list_t. */
static digestmap_t *trusted_dir_certs = NULL;
/** True iff any key certificate in at least one member of
* <b>trusted_dir_certs</b> has changed since we last flushed the
* certificates to disk. */
static int trusted_dir_servers_certs_changed = 0;
/** Global list of all of the routers that we know about. */
static routerlist_t *routerlist = NULL;
/** List of strings for nicknames we've already warned about and that are
* still unknown / unavailable. */
static smartlist_t *warned_nicknames = NULL;
/** The last time we tried to download any routerdesc, or 0 for "never". We
* use this to rate-limit download attempts when the number of routerdescs to
* download is low. */
static time_t last_descriptor_download_attempted = 0;
/** Return the number of directory authorities whose type matches some bit set
* in <b>type</b> */
int
get_n_authorities(dirinfo_type_t type)
{
int n = 0;
if (!trusted_dir_servers)
return 0;
SMARTLIST_FOREACH(trusted_dir_servers, dir_server_t *, ds,
if (ds->type & type)
++n);
return n;
}
/** Initialise schedule, want_authority, and increment_on in the download
* status dlstatus, then call download_status_reset() on it.
* It is safe to call this function or download_status_reset() multiple times
* on a new dlstatus. But it should *not* be called after a dlstatus has been
* used to count download attempts or failures. */
static void
download_status_cert_init(download_status_t *dlstatus)
{
dlstatus->schedule = DL_SCHED_CONSENSUS;
dlstatus->want_authority = DL_WANT_ANY_DIRSERVER;
dlstatus->increment_on = DL_SCHED_INCREMENT_FAILURE;
dlstatus->last_backoff_position = 0;
dlstatus->last_delay_used = 0;
/* Use the new schedule to set next_attempt_at */
download_status_reset(dlstatus);
}
/** Reset the download status of a specified element in a dsmap */
static void
download_status_reset_by_sk_in_cl(cert_list_t *cl, const char *digest)
{
download_status_t *dlstatus = NULL;
tor_assert(cl);
tor_assert(digest);
/* Make sure we have a dsmap */
if (!(cl->dl_status_map)) {
cl->dl_status_map = dsmap_new();
}
/* Look for a download_status_t in the map with this digest */
dlstatus = dsmap_get(cl->dl_status_map, digest);
/* Got one? */
if (!dlstatus) {
/* Insert before we reset */
dlstatus = tor_malloc_zero(sizeof(*dlstatus));
dsmap_set(cl->dl_status_map, digest, dlstatus);
download_status_cert_init(dlstatus);
}
tor_assert(dlstatus);
/* Go ahead and reset it */
download_status_reset(dlstatus);
}
/**
* Return true if the download for this signing key digest in cl is ready
* to be re-attempted.
*/
static int
download_status_is_ready_by_sk_in_cl(cert_list_t *cl,
const char *digest,
time_t now)
{
int rv = 0;
download_status_t *dlstatus = NULL;
tor_assert(cl);
tor_assert(digest);
/* Make sure we have a dsmap */
if (!(cl->dl_status_map)) {
cl->dl_status_map = dsmap_new();
}
/* Look for a download_status_t in the map with this digest */
dlstatus = dsmap_get(cl->dl_status_map, digest);
/* Got one? */
if (dlstatus) {
/* Use download_status_is_ready() */
rv = download_status_is_ready(dlstatus, now);
} else {
/*
* If we don't know anything about it, return 1, since we haven't
* tried this one before. We need to create a new entry here,
* too.
*/
dlstatus = tor_malloc_zero(sizeof(*dlstatus));
download_status_cert_init(dlstatus);
dsmap_set(cl->dl_status_map, digest, dlstatus);
rv = 1;
}
return rv;
}
/** Helper: Return the cert_list_t for an authority whose authority ID is
* <b>id_digest</b>, allocating a new list if necessary. */
static cert_list_t *
get_cert_list(const char *id_digest)
{
cert_list_t *cl;
if (!trusted_dir_certs)
trusted_dir_certs = digestmap_new();
cl = digestmap_get(trusted_dir_certs, id_digest);
if (!cl) {
cl = tor_malloc_zero(sizeof(cert_list_t));
download_status_cert_init(&cl->dl_status_by_id);
cl->certs = smartlist_new();
cl->dl_status_map = dsmap_new();
digestmap_set(trusted_dir_certs, id_digest, cl);
}
return cl;
}
/** Return a list of authority ID digests with potentially enumerable lists
* of download_status_t objects; used by controller GETINFO queries.
*/
MOCK_IMPL(smartlist_t *,
list_authority_ids_with_downloads, (void))
{
smartlist_t *ids = smartlist_new();
digestmap_iter_t *i;
const char *digest;
char *tmp;
void *cl;
if (trusted_dir_certs) {
for (i = digestmap_iter_init(trusted_dir_certs);
!(digestmap_iter_done(i));
i = digestmap_iter_next(trusted_dir_certs, i)) {
/*
* We always have at least dl_status_by_id to query, so no need to
* probe deeper than the existence of a cert_list_t.
*/
digestmap_iter_get(i, &digest, &cl);
tmp = tor_malloc(DIGEST_LEN);
memcpy(tmp, digest, DIGEST_LEN);
smartlist_add(ids, tmp);
}
}
/* else definitely no downloads going since nothing even has a cert list */
return ids;
}
/** Given an authority ID digest, return a pointer to the default download
* status, or NULL if there is no such entry in trusted_dir_certs */
MOCK_IMPL(download_status_t *,
id_only_download_status_for_authority_id, (const char *digest))
{
download_status_t *dl = NULL;
cert_list_t *cl;
if (trusted_dir_certs) {
cl = digestmap_get(trusted_dir_certs, digest);
if (cl) {
dl = &(cl->dl_status_by_id);
}
}
return dl;
}
/** Given an authority ID digest, return a smartlist of signing key digests
* for which download_status_t is potentially queryable, or NULL if no such
* authority ID digest is known. */
MOCK_IMPL(smartlist_t *,
list_sk_digests_for_authority_id, (const char *digest))
{
smartlist_t *sks = NULL;
cert_list_t *cl;
dsmap_iter_t *i;
const char *sk_digest;
char *tmp;
download_status_t *dl;
if (trusted_dir_certs) {
cl = digestmap_get(trusted_dir_certs, digest);
if (cl) {
sks = smartlist_new();
if (cl->dl_status_map) {
for (i = dsmap_iter_init(cl->dl_status_map);
!(dsmap_iter_done(i));
i = dsmap_iter_next(cl->dl_status_map, i)) {
/* Pull the digest out and add it to the list */
dsmap_iter_get(i, &sk_digest, &dl);
tmp = tor_malloc(DIGEST_LEN);
memcpy(tmp, sk_digest, DIGEST_LEN);
smartlist_add(sks, tmp);
}
}
}
}
return sks;
}
/** Given an authority ID digest and a signing key digest, return the
* download_status_t or NULL if none exists. */
MOCK_IMPL(download_status_t *,
download_status_for_authority_id_and_sk,(const char *id_digest,
const char *sk_digest))
{
download_status_t *dl = NULL;
cert_list_t *cl = NULL;
if (trusted_dir_certs) {
cl = digestmap_get(trusted_dir_certs, id_digest);
if (cl && cl->dl_status_map) {
dl = dsmap_get(cl->dl_status_map, sk_digest);
}
}
return dl;
}
#define cert_list_free(val) \
FREE_AND_NULL(cert_list_t, cert_list_free_, (val))
/** Release all space held by a cert_list_t */
static void
cert_list_free_(cert_list_t *cl)
{
if (!cl)
return;
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
authority_cert_free(cert));
smartlist_free(cl->certs);
dsmap_free(cl->dl_status_map, tor_free_);
tor_free(cl);
}
/** Wrapper for cert_list_free so we can pass it to digestmap_free */
static void
cert_list_free_void(void *cl)
{
cert_list_free_(cl);
}
/** Reload the cached v3 key certificates from the cached-certs file in
* the data directory. Return 0 on success, -1 on failure. */
int
trusted_dirs_reload_certs(void)
{
char *filename;
char *contents;
int r;
filename = get_cachedir_fname("cached-certs");
contents = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL);
tor_free(filename);
if (!contents)
return 0;
r = trusted_dirs_load_certs_from_string(
contents,
TRUSTED_DIRS_CERTS_SRC_FROM_STORE, 1, NULL);
tor_free(contents);
return r;
}
/** Helper: return true iff we already have loaded the exact cert
* <b>cert</b>. */
static inline int
already_have_cert(authority_cert_t *cert)
{
cert_list_t *cl = get_cert_list(cert->cache_info.identity_digest);
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, c,
{
if (tor_memeq(c->cache_info.signed_descriptor_digest,
cert->cache_info.signed_descriptor_digest,
DIGEST_LEN))
return 1;
});
return 0;
}
/** Load a bunch of new key certificates from the string <b>contents</b>. If
* <b>source</b> is TRUSTED_DIRS_CERTS_SRC_FROM_STORE, the certificates are
* from the cache, and we don't need to flush them to disk. If we are a
* dirauth loading our own cert, source is TRUSTED_DIRS_CERTS_SRC_SELF.
* Otherwise, source is download type: TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST
* or TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_SK_DIGEST. If <b>flush</b> is true, we
* need to flush any changed certificates to disk now. Return 0 on success,
* -1 if any certs fail to parse.
*
* If source_dir is non-NULL, it's the identity digest for a directory that
* we've just successfully retrieved certificates from, so try it first to
* fetch any missing certificates.
*/
int
trusted_dirs_load_certs_from_string(const char *contents, int source,
int flush, const char *source_dir)
{
dir_server_t *ds;
const char *s, *eos;
int failure_code = 0;
int from_store = (source == TRUSTED_DIRS_CERTS_SRC_FROM_STORE);
int added_trusted_cert = 0;
for (s = contents; *s; s = eos) {
authority_cert_t *cert = authority_cert_parse_from_string(s, &eos);
cert_list_t *cl;
if (!cert) {
failure_code = -1;
break;
}
ds = trusteddirserver_get_by_v3_auth_digest(
cert->cache_info.identity_digest);
log_debug(LD_DIR, "Parsed certificate for %s",
ds ? ds->nickname : "unknown authority");
if (already_have_cert(cert)) {
/* we already have this one. continue. */
log_info(LD_DIR, "Skipping %s certificate for %s that we "
"already have.",
from_store ? "cached" : "downloaded",
ds ? ds->nickname : "an old or new authority");
/*
* A duplicate on download should be treated as a failure, so we call
* authority_cert_dl_failed() to reset the download status to make sure
* we can't try again. Since we've implemented the fp-sk mechanism
* to download certs by signing key, this should be much rarer than it
* was and is perhaps cause for concern.
*/
if (!from_store) {
if (authdir_mode(get_options())) {
log_warn(LD_DIR,
"Got a certificate for %s, but we already have it. "
"Maybe they haven't updated it. Waiting for a while.",
ds ? ds->nickname : "an old or new authority");
} else {
log_info(LD_DIR,
"Got a certificate for %s, but we already have it. "
"Maybe they haven't updated it. Waiting for a while.",
ds ? ds->nickname : "an old or new authority");
}
/*
* This is where we care about the source; authority_cert_dl_failed()
* needs to know whether the download was by fp or (fp,sk) pair to
* twiddle the right bit in the download map.
*/
if (source == TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_DIGEST) {
authority_cert_dl_failed(cert->cache_info.identity_digest,
NULL, 404);
} else if (source == TRUSTED_DIRS_CERTS_SRC_DL_BY_ID_SK_DIGEST) {
authority_cert_dl_failed(cert->cache_info.identity_digest,
cert->signing_key_digest, 404);
}
}
authority_cert_free(cert);
continue;
}
if (ds) {
added_trusted_cert = 1;
log_info(LD_DIR, "Adding %s certificate for directory authority %s with "
"signing key %s", from_store ? "cached" : "downloaded",
ds->nickname, hex_str(cert->signing_key_digest,DIGEST_LEN));
} else {
int adding = we_want_to_fetch_unknown_auth_certs(get_options());
log_info(LD_DIR, "%s %s certificate for unrecognized directory "
"authority with signing key %s",
adding ? "Adding" : "Not adding",
from_store ? "cached" : "downloaded",
hex_str(cert->signing_key_digest,DIGEST_LEN));
if (!adding) {
authority_cert_free(cert);
continue;
}
}
cl = get_cert_list(cert->cache_info.identity_digest);
smartlist_add(cl->certs, cert);
if (ds && cert->cache_info.published_on > ds->addr_current_at) {
/* Check to see whether we should update our view of the authority's
* address. */
if (cert->addr && cert->dir_port &&
(ds->addr != cert->addr ||
ds->dir_port != cert->dir_port)) {
char *a = tor_dup_ip(cert->addr);
log_notice(LD_DIR, "Updating address for directory authority %s "
"from %s:%d to %s:%d based on certificate.",
ds->nickname, ds->address, (int)ds->dir_port,
a, cert->dir_port);
tor_free(a);
ds->addr = cert->addr;
ds->dir_port = cert->dir_port;
}
ds->addr_current_at = cert->cache_info.published_on;
}
if (!from_store)
trusted_dir_servers_certs_changed = 1;
}
if (flush)
trusted_dirs_flush_certs_to_disk();
/* call this even if failure_code is <0, since some certs might have
* succeeded, but only pass source_dir if there were no failures,
* and at least one more authority certificate was added to the store.
* This avoids retrying a directory that's serving bad or entirely duplicate
* certificates. */
if (failure_code == 0 && added_trusted_cert) {
networkstatus_note_certs_arrived(source_dir);
} else {
networkstatus_note_certs_arrived(NULL);
}
return failure_code;
}
/** Save all v3 key certificates to the cached-certs file. */
void
trusted_dirs_flush_certs_to_disk(void)
{
char *filename;
smartlist_t *chunks;
if (!trusted_dir_servers_certs_changed || !trusted_dir_certs)
return;
chunks = smartlist_new();
DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) {
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
{
sized_chunk_t *c = tor_malloc(sizeof(sized_chunk_t));
c->bytes = cert->cache_info.signed_descriptor_body;
c->len = cert->cache_info.signed_descriptor_len;
smartlist_add(chunks, c);
});
} DIGESTMAP_FOREACH_END;
filename = get_cachedir_fname("cached-certs");
if (write_chunks_to_file(filename, chunks, 0, 0)) {
log_warn(LD_FS, "Error writing certificates to disk.");
}
tor_free(filename);
SMARTLIST_FOREACH(chunks, sized_chunk_t *, c, tor_free(c));
smartlist_free(chunks);
trusted_dir_servers_certs_changed = 0;
}
static int
compare_certs_by_pubdates(const void **_a, const void **_b)
{
const authority_cert_t *cert1 = *_a, *cert2=*_b;
if (cert1->cache_info.published_on < cert2->cache_info.published_on)
return -1;
else if (cert1->cache_info.published_on > cert2->cache_info.published_on)
return 1;
else
return 0;
}
/** Remove all expired v3 authority certificates that have been superseded for
* more than 48 hours or, if not expired, that were published more than 7 days
* before being superseded. (If the most recent cert was published more than 48
* hours ago, then we aren't going to get any consensuses signed with older
* keys.) */
static void
trusted_dirs_remove_old_certs(void)
{
time_t now = time(NULL);
#define DEAD_CERT_LIFETIME (2*24*60*60)
#define SUPERSEDED_CERT_LIFETIME (2*24*60*60)
if (!trusted_dir_certs)
return;
DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) {
/* Sort the list from first-published to last-published */
smartlist_sort(cl->certs, compare_certs_by_pubdates);
SMARTLIST_FOREACH_BEGIN(cl->certs, authority_cert_t *, cert) {
if (cert_sl_idx == smartlist_len(cl->certs) - 1) {
/* This is the most recently published cert. Keep it. */
continue;
}
authority_cert_t *next_cert = smartlist_get(cl->certs, cert_sl_idx+1);
const time_t next_cert_published = next_cert->cache_info.published_on;
if (next_cert_published > now) {
/* All later certs are published in the future. Keep everything
* we didn't discard. */
break;
}
int should_remove = 0;
if (cert->expires + DEAD_CERT_LIFETIME < now) {
/* Certificate has been expired for at least DEAD_CERT_LIFETIME.
* Remove it. */
should_remove = 1;
} else if (next_cert_published + SUPERSEDED_CERT_LIFETIME < now) {
/* Certificate has been superseded for OLD_CERT_LIFETIME.
* Remove it.
*/
should_remove = 1;
}
if (should_remove) {
SMARTLIST_DEL_CURRENT_KEEPORDER(cl->certs, cert);
authority_cert_free(cert);
trusted_dir_servers_certs_changed = 1;
}
} SMARTLIST_FOREACH_END(cert);
} DIGESTMAP_FOREACH_END;
#undef DEAD_CERT_LIFETIME
#undef OLD_CERT_LIFETIME
trusted_dirs_flush_certs_to_disk();
}
/** Return the newest v3 authority certificate whose v3 authority identity key
* has digest <b>id_digest</b>. Return NULL if no such authority is known,
* or it has no certificate. */
authority_cert_t *
authority_cert_get_newest_by_id(const char *id_digest)
{
cert_list_t *cl;
authority_cert_t *best = NULL;
if (!trusted_dir_certs ||
!(cl = digestmap_get(trusted_dir_certs, id_digest)))
return NULL;
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
{
if (!best || cert->cache_info.published_on > best->cache_info.published_on)
best = cert;
});
return best;
}
/** Return the newest v3 authority certificate whose directory signing key has
* digest <b>sk_digest</b>. Return NULL if no such certificate is known.
*/
authority_cert_t *
authority_cert_get_by_sk_digest(const char *sk_digest)
{
authority_cert_t *c;
if (!trusted_dir_certs)
return NULL;
if ((c = get_my_v3_authority_cert()) &&
tor_memeq(c->signing_key_digest, sk_digest, DIGEST_LEN))
return c;
if ((c = get_my_v3_legacy_cert()) &&
tor_memeq(c->signing_key_digest, sk_digest, DIGEST_LEN))
return c;
DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) {
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
{
if (tor_memeq(cert->signing_key_digest, sk_digest, DIGEST_LEN))
return cert;
});
} DIGESTMAP_FOREACH_END;
return NULL;
}
/** Return the v3 authority certificate with signing key matching
* <b>sk_digest</b>, for the authority with identity digest <b>id_digest</b>.
* Return NULL if no such authority is known. */
authority_cert_t *
authority_cert_get_by_digests(const char *id_digest,
const char *sk_digest)
{
cert_list_t *cl;
if (!trusted_dir_certs ||
!(cl = digestmap_get(trusted_dir_certs, id_digest)))
return NULL;
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, cert,
if (tor_memeq(cert->signing_key_digest, sk_digest, DIGEST_LEN))
return cert; );
return NULL;
}
/** Add every known authority_cert_t to <b>certs_out</b>. */
void
authority_cert_get_all(smartlist_t *certs_out)
{
tor_assert(certs_out);
if (!trusted_dir_certs)
return;
DIGESTMAP_FOREACH(trusted_dir_certs, key, cert_list_t *, cl) {
SMARTLIST_FOREACH(cl->certs, authority_cert_t *, c,
smartlist_add(certs_out, c));
} DIGESTMAP_FOREACH_END;
}
/** Called when an attempt to download a certificate with the authority with
* ID <b>id_digest</b> and, if not NULL, signed with key signing_key_digest
* fails with HTTP response code <b>status</b>: remember the failure, so we
* don't try again immediately. */
void
authority_cert_dl_failed(const char *id_digest,
const char *signing_key_digest, int status)
{
cert_list_t *cl;
download_status_t *dlstatus = NULL;
char id_digest_str[2*DIGEST_LEN+1];
char sk_digest_str[2*DIGEST_LEN+1];
if (!trusted_dir_certs ||
!(cl = digestmap_get(trusted_dir_certs, id_digest)))
return;
/*
* Are we noting a failed download of the latest cert for the id digest,
* or of a download by (id, signing key) digest pair?
*/
if (!signing_key_digest) {
/* Just by id digest */
download_status_failed(&cl->dl_status_by_id, status);
} else {
/* Reset by (id, signing key) digest pair
*
* Look for a download_status_t in the map with this digest
*/
dlstatus = dsmap_get(cl->dl_status_map, signing_key_digest);
/* Got one? */
if (dlstatus) {
download_status_failed(dlstatus, status);
} else {
/*
* Do this rather than hex_str(), since hex_str clobbers
* old results and we call twice in the param list.
*/
base16_encode(id_digest_str, sizeof(id_digest_str),
id_digest, DIGEST_LEN);
base16_encode(sk_digest_str, sizeof(sk_digest_str),
signing_key_digest, DIGEST_LEN);
log_warn(LD_BUG,
"Got failure for cert fetch with (fp,sk) = (%s,%s), with "
"status %d, but knew nothing about the download.",
id_digest_str, sk_digest_str, status);
}
}
}
static const char *BAD_SIGNING_KEYS[] = {
"09CD84F751FD6E955E0F8ADB497D5401470D697E", // Expires 2015-01-11 16:26:31
"0E7E9C07F0969D0468AD741E172A6109DC289F3C", // Expires 2014-08-12 10:18:26
"57B85409891D3FB32137F642FDEDF8B7F8CDFDCD", // Expires 2015-02-11 17:19:09
"87326329007AF781F587AF5B594E540B2B6C7630", // Expires 2014-07-17 11:10:09
"98CC82342DE8D298CF99D3F1A396475901E0D38E", // Expires 2014-11-10 13:18:56
"9904B52336713A5ADCB13E4FB14DC919E0D45571", // Expires 2014-04-20 20:01:01
"9DCD8E3F1DD1597E2AD476BBA28A1A89F3095227", // Expires 2015-01-16 03:52:30
"A61682F34B9BB9694AC98491FE1ABBFE61923941", // Expires 2014-06-11 09:25:09
"B59F6E99C575113650C99F1C425BA7B20A8C071D", // Expires 2014-07-31 13:22:10
"D27178388FA75B96D37FA36E0B015227DDDBDA51", // Expires 2014-08-04 04:01:57
NULL,
};
/** Return true iff <b>cert</b> authenticates some atuhority signing key
* which, because of the old openssl heartbleed vulnerability, should
* never be trusted. */
int
authority_cert_is_blacklisted(const authority_cert_t *cert)
{
char hex_digest[HEX_DIGEST_LEN+1];
int i;
base16_encode(hex_digest, sizeof(hex_digest),
cert->signing_key_digest, sizeof(cert->signing_key_digest));
for (i = 0; BAD_SIGNING_KEYS[i]; ++i) {
if (!strcasecmp(hex_digest, BAD_SIGNING_KEYS[i])) {
return 1;
}
}
return 0;
}
/** Return true iff when we've been getting enough failures when trying to
* download the certificate with ID digest <b>id_digest</b> that we're willing
* to start bugging the user about it. */
int
authority_cert_dl_looks_uncertain(const char *id_digest)
{
#define N_AUTH_CERT_DL_FAILURES_TO_BUG_USER 2
cert_list_t *cl;
int n_failures;
if (!trusted_dir_certs ||
!(cl = digestmap_get(trusted_dir_certs, id_digest)))
return 0;
n_failures = download_status_get_n_failures(&cl->dl_status_by_id);
return n_failures >= N_AUTH_CERT_DL_FAILURES_TO_BUG_USER;
}
/* Fetch the authority certificates specified in resource.
* If we are a bridge client, and node is a configured bridge, fetch from node
* using dir_hint as the fingerprint. Otherwise, if rs is not NULL, fetch from
* rs. Otherwise, fetch from a random directory mirror. */
static void
authority_certs_fetch_resource_impl(const char *resource,
const char *dir_hint,
const node_t *node,
const routerstatus_t *rs)
{
const or_options_t *options = get_options();
int get_via_tor = purpose_needs_anonymity(DIR_PURPOSE_FETCH_CERTIFICATE, 0,
resource);
/* Make sure bridge clients never connect to anything but a bridge */
if (options->UseBridges) {
if (node && !node_is_a_configured_bridge(node)) {
/* If we're using bridges, and node is not a bridge, use a 3-hop path. */
get_via_tor = 1;
} else if (!node) {
/* If we're using bridges, and there's no node, use a 3-hop path. */
get_via_tor = 1;
}
}
const dir_indirection_t indirection = get_via_tor ? DIRIND_ANONYMOUS
: DIRIND_ONEHOP;
directory_request_t *req = NULL;
/* If we've just downloaded a consensus from a bridge, re-use that
* bridge */
if (options->UseBridges && node && node->ri && !get_via_tor) {
/* clients always make OR connections to bridges */
tor_addr_port_t or_ap;
/* we are willing to use a non-preferred address if we need to */
fascist_firewall_choose_address_node(node, FIREWALL_OR_CONNECTION, 0,
&or_ap);
req = directory_request_new(DIR_PURPOSE_FETCH_CERTIFICATE);
directory_request_set_or_addr_port(req, &or_ap);
if (dir_hint)
directory_request_set_directory_id_digest(req, dir_hint);
} else if (rs) {
/* And if we've just downloaded a consensus from a directory, re-use that
* directory */
req = directory_request_new(DIR_PURPOSE_FETCH_CERTIFICATE);
directory_request_set_routerstatus(req, rs);
}
if (req) {
/* We've set up a request object -- fill in the other request fields, and
* send the request. */
directory_request_set_indirection(req, indirection);
directory_request_set_resource(req, resource);
directory_initiate_request(req);
directory_request_free(req);
return;
}
/* Otherwise, we want certs from a random fallback or directory
* mirror, because they will almost always succeed. */
directory_get_from_dirserver(DIR_PURPOSE_FETCH_CERTIFICATE, 0,
resource, PDS_RETRY_IF_NO_SERVERS,
DL_WANT_ANY_DIRSERVER);
}
/** Try to download any v3 authority certificates that we may be missing. If
* <b>status</b> is provided, try to get all the ones that were used to sign
* <b>status</b>. Additionally, try to have a non-expired certificate for
* every V3 authority in trusted_dir_servers. Don't fetch certificates we
* already have.
*
* If dir_hint is non-NULL, it's the identity digest for a directory that
* we've just successfully retrieved a consensus or certificates from, so try
* it first to fetch any missing certificates.
**/
void
authority_certs_fetch_missing(networkstatus_t *status, time_t now,
const char *dir_hint)
{
/*
* The pending_id digestmap tracks pending certificate downloads by
* identity digest; the pending_cert digestmap tracks pending downloads
* by (identity digest, signing key digest) pairs.
*/
digestmap_t *pending_id;
fp_pair_map_t *pending_cert;
/*
* The missing_id_digests smartlist will hold a list of id digests
* we want to fetch the newest cert for; the missing_cert_digests
* smartlist will hold a list of fp_pair_t with an identity and
* signing key digest.
*/
smartlist_t *missing_cert_digests, *missing_id_digests;
char *resource = NULL;
cert_list_t *cl;
const or_options_t *options = get_options();
const int keep_unknown = we_want_to_fetch_unknown_auth_certs(options);
fp_pair_t *fp_tmp = NULL;
char id_digest_str[2*DIGEST_LEN+1];
char sk_digest_str[2*DIGEST_LEN+1];
if (should_delay_dir_fetches(options, NULL))
return;
pending_cert = fp_pair_map_new();
pending_id = digestmap_new();
missing_cert_digests = smartlist_new();
missing_id_digests = smartlist_new();
/*
* First, we get the lists of already pending downloads so we don't
* duplicate effort.
*/
list_pending_downloads(pending_id, NULL,
DIR_PURPOSE_FETCH_CERTIFICATE, "fp/");
list_pending_fpsk_downloads(pending_cert);
/*
* Now, we download any trusted authority certs we don't have by
* identity digest only. This gets the latest cert for that authority.
*/
SMARTLIST_FOREACH_BEGIN(trusted_dir_servers, dir_server_t *, ds) {
int found = 0;
if (!(ds->type & V3_DIRINFO))
continue;
if (smartlist_contains_digest(missing_id_digests,
ds->v3_identity_digest))
continue;
cl = get_cert_list(ds->v3_identity_digest);
SMARTLIST_FOREACH_BEGIN(cl->certs, authority_cert_t *, cert) {
if (now < cert->expires) {
/* It's not expired, and we weren't looking for something to
* verify a consensus with. Call it done. */
download_status_reset(&(cl->dl_status_by_id));
/* No sense trying to download it specifically by signing key hash */
download_status_reset_by_sk_in_cl(cl, cert->signing_key_digest);
found = 1;
break;
}
} SMARTLIST_FOREACH_END(cert);
if (!found &&
download_status_is_ready(&(cl->dl_status_by_id), now) &&
!digestmap_get(pending_id, ds->v3_identity_digest)) {
log_info(LD_DIR,
"No current certificate known for authority %s "
"(ID digest %s); launching request.",
ds->nickname, hex_str(ds->v3_identity_digest, DIGEST_LEN));
smartlist_add(missing_id_digests, ds->v3_identity_digest);
}
} SMARTLIST_FOREACH_END(ds);
/*
* Next, if we have a consensus, scan through it and look for anything
* signed with a key from a cert we don't have. Those get downloaded
* by (fp,sk) pair, but if we don't know any certs at all for the fp
* (identity digest), and it's one of the trusted dir server certs
* we started off above or a pending download in pending_id, don't
* try to get it yet. Most likely, the one we'll get for that will
* have the right signing key too, and we'd just be downloading
* redundantly.
*/
if (status) {
SMARTLIST_FOREACH_BEGIN(status->voters, networkstatus_voter_info_t *,
voter) {
if (!smartlist_len(voter->sigs))
continue; /* This authority never signed this consensus, so don't
* go looking for a cert with key digest 0000000000. */
if (!keep_unknown &&
!trusteddirserver_get_by_v3_auth_digest(voter->identity_digest))
continue; /* We don't want unknown certs, and we don't know this
* authority.*/
/*
* If we don't know *any* cert for this authority, and a download by ID
* is pending or we added it to missing_id_digests above, skip this
* one for now to avoid duplicate downloads.
*/
cl = get_cert_list(voter->identity_digest);
if (smartlist_len(cl->certs) == 0) {
/* We have no certs at all for this one */
/* Do we have a download of one pending? */
if (digestmap_get(pending_id, voter->identity_digest))
continue;
/*
* Are we about to launch a download of one due to the trusted
* dir server check above?
*/
if (smartlist_contains_digest(missing_id_digests,
voter->identity_digest))
continue;
}
SMARTLIST_FOREACH_BEGIN(voter->sigs, document_signature_t *, sig) {
authority_cert_t *cert =
authority_cert_get_by_digests(voter->identity_digest,
sig->signing_key_digest);
if (cert) {
if (now < cert->expires)
download_status_reset_by_sk_in_cl(cl, sig->signing_key_digest);
continue;
}
if (download_status_is_ready_by_sk_in_cl(
cl, sig->signing_key_digest, now) &&
!fp_pair_map_get_by_digests(pending_cert,
voter->identity_digest,
sig->signing_key_digest)) {
/*
* Do this rather than hex_str(), since hex_str clobbers
* old results and we call twice in the param list.
*/
base16_encode(id_digest_str, sizeof(id_digest_str),
voter->identity_digest, DIGEST_LEN);
base16_encode(sk_digest_str, sizeof(sk_digest_str),
sig->signing_key_digest, DIGEST_LEN);
if (voter->nickname) {
log_info(LD_DIR,
"We're missing a certificate from authority %s "
"(ID digest %s) with signing key %s: "
"launching request.",
voter->nickname, id_digest_str, sk_digest_str);
} else {
log_info(LD_DIR,
"We're missing a certificate from authority ID digest "
"%s with signing key %s: launching request.",
id_digest_str, sk_digest_str);
}
/* Allocate a new fp_pair_t to append */
fp_tmp = tor_malloc(sizeof(*fp_tmp));
memcpy(fp_tmp->first, voter->identity_digest, sizeof(fp_tmp->first));
memcpy(fp_tmp->second, sig->signing_key_digest,
sizeof(fp_tmp->second));
smartlist_add(missing_cert_digests, fp_tmp);
}
} SMARTLIST_FOREACH_END(sig);
} SMARTLIST_FOREACH_END(voter);
}
/* Bridge clients look up the node for the dir_hint */
const node_t *node = NULL;
/* All clients, including bridge clients, look up the routerstatus for the
* dir_hint */
const routerstatus_t *rs = NULL;
/* If we still need certificates, try the directory that just successfully
* served us a consensus or certificates.
* As soon as the directory fails to provide additional certificates, we try
* another, randomly selected directory. This avoids continual retries.
* (We only ever have one outstanding request per certificate.)
*/
if (dir_hint) {
if (options->UseBridges) {
/* Bridge clients try the nodelist. If the dir_hint is from an authority,
* or something else fetched over tor, we won't find the node here, but
* we will find the rs. */
node = node_get_by_id(dir_hint);
}
/* All clients try the consensus routerstatus, then the fallback
* routerstatus */
rs = router_get_consensus_status_by_id(dir_hint);
if (!rs) {
/* This will also find authorities */
const dir_server_t *ds = router_get_fallback_dirserver_by_digest(
dir_hint);
if (ds) {
rs = &ds->fake_status;
}
}
if (!node && !rs) {
log_warn(LD_BUG, "Directory %s delivered a consensus, but %s"
"no routerstatus could be found for it.",
options->UseBridges ? "no node and " : "",
hex_str(dir_hint, DIGEST_LEN));
}
}
/* Do downloads by identity digest */
if (smartlist_len(missing_id_digests) > 0) {
int need_plus = 0;
smartlist_t *fps = smartlist_new();
smartlist_add_strdup(fps, "fp/");
SMARTLIST_FOREACH_BEGIN(missing_id_digests, const char *, d) {
char *fp = NULL;
if (digestmap_get(pending_id, d))
continue;
base16_encode(id_digest_str, sizeof(id_digest_str),
d, DIGEST_LEN);
if (need_plus) {
tor_asprintf(&fp, "+%s", id_digest_str);
} else {
/* No need for tor_asprintf() in this case; first one gets no '+' */
fp = tor_strdup(id_digest_str);
need_plus = 1;
}
smartlist_add(fps, fp);
} SMARTLIST_FOREACH_END(d);
if (smartlist_len(fps) > 1) {
resource = smartlist_join_strings(fps, "", 0, NULL);
/* node and rs are directories that just gave us a consensus or
* certificates */
authority_certs_fetch_resource_impl(resource, dir_hint, node, rs);
tor_free(resource);
}
/* else we didn't add any: they were all pending */
SMARTLIST_FOREACH(fps, char *, cp, tor_free(cp));
smartlist_free(fps);
}
/* Do downloads by identity digest/signing key pair */
if (smartlist_len(missing_cert_digests) > 0) {
int need_plus = 0;
smartlist_t *fp_pairs = smartlist_new();
smartlist_add_strdup(fp_pairs, "fp-sk/");
SMARTLIST_FOREACH_BEGIN(missing_cert_digests, const fp_pair_t *, d) {
char *fp_pair = NULL;
if (fp_pair_map_get(pending_cert, d))
continue;
/* Construct string encodings of the digests */
base16_encode(id_digest_str, sizeof(id_digest_str),
d->first, DIGEST_LEN);
base16_encode(sk_digest_str, sizeof(sk_digest_str),
d->second, DIGEST_LEN);
/* Now tor_asprintf() */
if (need_plus) {
tor_asprintf(&fp_pair, "+%s-%s", id_digest_str, sk_digest_str);
} else {
/* First one in the list doesn't get a '+' */
tor_asprintf(&fp_pair, "%s-%s", id_digest_str, sk_digest_str);
need_plus = 1;
}
/* Add it to the list of pairs to request */
smartlist_add(fp_pairs, fp_pair);
} SMARTLIST_FOREACH_END(d);
if (smartlist_len(fp_pairs) > 1) {
resource = smartlist_join_strings(fp_pairs, "", 0, NULL);
/* node and rs are directories that just gave us a consensus or
* certificates */
authority_certs_fetch_resource_impl(resource, dir_hint, node, rs);
tor_free(resource);
}
/* else they were all pending */
SMARTLIST_FOREACH(fp_pairs, char *, p, tor_free(p));
smartlist_free(fp_pairs);
}
smartlist_free(missing_id_digests);
SMARTLIST_FOREACH(missing_cert_digests, fp_pair_t *, p, tor_free(p));
smartlist_free(missing_cert_digests);
digestmap_free(pending_id, NULL);
fp_pair_map_free(pending_cert, NULL);
}
/* Router descriptor storage.
*
* Routerdescs are stored in a big file, named "cached-descriptors". As new
* routerdescs arrive, we append them to a journal file named
* "cached-descriptors.new".
*
* From time to time, we replace "cached-descriptors" with a new file
* containing only the live, non-superseded descriptors, and clear
* cached-routers.new.
*
* On startup, we read both files.
*/
/** Helper: return 1 iff the router log is so big we want to rebuild the
* store. */
static int
router_should_rebuild_store(desc_store_t *store)
{
if (store->store_len > (1<<16))
return (store->journal_len > store->store_len / 2 ||
store->bytes_dropped > store->store_len / 2);
else
return store->journal_len > (1<<15);
}
/** Return the desc_store_t in <b>rl</b> that should be used to store
* <b>sd</b>. */
static inline desc_store_t *
desc_get_store(routerlist_t *rl, const signed_descriptor_t *sd)
{
if (sd->is_extrainfo)
return &rl->extrainfo_store;
else
return &rl->desc_store;
}
/** Add the signed_descriptor_t in <b>desc</b> to the router
* journal; change its saved_location to SAVED_IN_JOURNAL and set its
* offset appropriately. */
static int
signed_desc_append_to_journal(signed_descriptor_t *desc,
desc_store_t *store)
{
char *fname = get_cachedir_fname_suffix(store->fname_base, ".new");
const char *body = signed_descriptor_get_body_impl(desc,1);
size_t len = desc->signed_descriptor_len + desc->annotations_len;
if (append_bytes_to_file(fname, body, len, 1)) {
log_warn(LD_FS, "Unable to store router descriptor");
tor_free(fname);
return -1;
}
desc->saved_location = SAVED_IN_JOURNAL;
tor_free(fname);
desc->saved_offset = store->journal_len;
store->journal_len += len;
return 0;
}
/** Sorting helper: return &lt;0, 0, or &gt;0 depending on whether the
* signed_descriptor_t* in *<b>a</b> is older, the same age as, or newer than
* the signed_descriptor_t* in *<b>b</b>. */
static int
compare_signed_descriptors_by_age_(const void **_a, const void **_b)
{
const signed_descriptor_t *r1 = *_a, *r2 = *_b;
return (int)(r1->published_on - r2->published_on);
}
#define RRS_FORCE 1
#define RRS_DONT_REMOVE_OLD 2
/** If the journal of <b>store</b> is too long, or if RRS_FORCE is set in
* <b>flags</b>, then atomically replace the saved router store with the
* routers currently in our routerlist, and clear the journal. Unless
* RRS_DONT_REMOVE_OLD is set in <b>flags</b>, delete expired routers before
* rebuilding the store. Return 0 on success, -1 on failure.
*/
static int
router_rebuild_store(int flags, desc_store_t *store)
{
smartlist_t *chunk_list = NULL;
char *fname = NULL, *fname_tmp = NULL;
int r = -1;
off_t offset = 0;
smartlist_t *signed_descriptors = NULL;
int nocache=0;
size_t total_expected_len = 0;
int had_any;
int force = flags & RRS_FORCE;
if (!force && !router_should_rebuild_store(store)) {
r = 0;
goto done;
}
if (!routerlist) {
r = 0;
goto done;
}
if (store->type == EXTRAINFO_STORE)
had_any = !eimap_isempty(routerlist->extra_info_map);
else
had_any = (smartlist_len(routerlist->routers)+
smartlist_len(routerlist->old_routers))>0;
/* Don't save deadweight. */
if (!(flags & RRS_DONT_REMOVE_OLD))
routerlist_remove_old_routers();
log_info(LD_DIR, "Rebuilding %s cache", store->description);
fname = get_cachedir_fname(store->fname_base);
fname_tmp = get_cachedir_fname_suffix(store->fname_base, ".tmp");
chunk_list = smartlist_new();
/* We sort the routers by age to enhance locality on disk. */
signed_descriptors = smartlist_new();
if (store->type == EXTRAINFO_STORE) {
eimap_iter_t *iter;
for (iter = eimap_iter_init(routerlist->extra_info_map);
!eimap_iter_done(iter);
iter = eimap_iter_next(routerlist->extra_info_map, iter)) {
const char *key;
extrainfo_t *ei;
eimap_iter_get(iter, &key, &ei);
smartlist_add(signed_descriptors, &ei->cache_info);
}
} else {
SMARTLIST_FOREACH(routerlist->old_routers, signed_descriptor_t *, sd,
smartlist_add(signed_descriptors, sd));
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, ri,
smartlist_add(signed_descriptors, &ri->cache_info));
}
smartlist_sort(signed_descriptors, compare_signed_descriptors_by_age_);
/* Now, add the appropriate members to chunk_list */
SMARTLIST_FOREACH_BEGIN(signed_descriptors, signed_descriptor_t *, sd) {
sized_chunk_t *c;
const char *body = signed_descriptor_get_body_impl(sd, 1);
if (!body) {
log_warn(LD_BUG, "No descriptor available for router.");
goto done;
}
if (sd->do_not_cache) {
++nocache;
continue;
}
c = tor_malloc(sizeof(sized_chunk_t));
c->bytes = body;
c->len = sd->signed_descriptor_len + sd->annotations_len;
total_expected_len += c->len;
smartlist_add(chunk_list, c);
} SMARTLIST_FOREACH_END(sd);
if (write_chunks_to_file(fname_tmp, chunk_list, 1, 1)<0) {
log_warn(LD_FS, "Error writing router store to disk.");
goto done;
}
/* Our mmap is now invalid. */
if (store->mmap) {
int res = tor_munmap_file(store->mmap);
store->mmap = NULL;
if (res != 0) {
log_warn(LD_FS, "Unable to munmap route store in %s", fname);
}
}
if (replace_file(fname_tmp, fname)<0) {
log_warn(LD_FS, "Error replacing old router store: %s", strerror(errno));
goto done;
}
errno = 0;
store->mmap = tor_mmap_file(fname);
if (! store->mmap) {
if (errno == ERANGE) {
/* empty store.*/
if (total_expected_len) {
log_warn(LD_FS, "We wrote some bytes to a new descriptor file at '%s',"
" but when we went to mmap it, it was empty!", fname);
} else if (had_any) {
log_info(LD_FS, "We just removed every descriptor in '%s'. This is "
"okay if we're just starting up after a long time. "
"Otherwise, it's a bug.", fname);
}
} else {
log_warn(LD_FS, "Unable to mmap new descriptor file at '%s'.",fname);
}
}
log_info(LD_DIR, "Reconstructing pointers into cache");
offset = 0;
SMARTLIST_FOREACH_BEGIN(signed_descriptors, signed_descriptor_t *, sd) {
if (sd->do_not_cache)
continue;
sd->saved_location = SAVED_IN_CACHE;
if (store->mmap) {
tor_free(sd->signed_descriptor_body); // sets it to null
sd->saved_offset = offset;
}
offset += sd->signed_descriptor_len + sd->annotations_len;
signed_descriptor_get_body(sd); /* reconstruct and assert */
} SMARTLIST_FOREACH_END(sd);
tor_free(fname);
fname = get_cachedir_fname_suffix(store->fname_base, ".new");
write_str_to_file(fname, "", 1);
r = 0;
store->store_len = (size_t) offset;
store->journal_len = 0;
store->bytes_dropped = 0;
done:
smartlist_free(signed_descriptors);
tor_free(fname);
tor_free(fname_tmp);
if (chunk_list) {
SMARTLIST_FOREACH(chunk_list, sized_chunk_t *, c, tor_free(c));
smartlist_free(chunk_list);
}
return r;
}
/** Helper: Reload a cache file and its associated journal, setting metadata
* appropriately. If <b>extrainfo</b> is true, reload the extrainfo store;
* else reload the router descriptor store. */
static int
router_reload_router_list_impl(desc_store_t *store)
{
char *fname = NULL, *contents = NULL;
struct stat st;
int extrainfo = (store->type == EXTRAINFO_STORE);
store->journal_len = store->store_len = 0;
fname = get_cachedir_fname(store->fname_base);
if (store->mmap) {
/* get rid of it first */
int res = tor_munmap_file(store->mmap);
store->mmap = NULL;
if (res != 0) {
log_warn(LD_FS, "Failed to munmap %s", fname);
tor_free(fname);
return -1;
}
}
store->mmap = tor_mmap_file(fname);
if (store->mmap) {
store->store_len = store->mmap->size;
if (extrainfo)
router_load_extrainfo_from_string(store->mmap->data,
store->mmap->data+store->mmap->size,
SAVED_IN_CACHE, NULL, 0);
else
router_load_routers_from_string(store->mmap->data,
store->mmap->data+store->mmap->size,
SAVED_IN_CACHE, NULL, 0, NULL);
}
tor_free(fname);
fname = get_cachedir_fname_suffix(store->fname_base, ".new");
/* don't load empty files - we wouldn't get any data, even if we tried */
if (file_status(fname) == FN_FILE)
contents = read_file_to_str(fname, RFTS_BIN|RFTS_IGNORE_MISSING, &st);
if (contents) {
if (extrainfo)
router_load_extrainfo_from_string(contents, NULL,SAVED_IN_JOURNAL,
NULL, 0);
else
router_load_routers_from_string(contents, NULL, SAVED_IN_JOURNAL,
NULL, 0, NULL);
store->journal_len = (size_t) st.st_size;
tor_free(contents);
}
tor_free(fname);
if (store->journal_len) {
/* Always clear the journal on startup.*/
router_rebuild_store(RRS_FORCE, store);
} else if (!extrainfo) {
/* Don't cache expired routers. (This is in an else because
* router_rebuild_store() also calls remove_old_routers().) */
routerlist_remove_old_routers();
}
return 0;
}
/** Load all cached router descriptors and extra-info documents from the
* store. Return 0 on success and -1 on failure.
*/
int
router_reload_router_list(void)
{
routerlist_t *rl = router_get_routerlist();
if (router_reload_router_list_impl(&rl->desc_store))
return -1;
if (router_reload_router_list_impl(&rl->extrainfo_store))
return -1;
return 0;
}
/** Return a smartlist containing a list of dir_server_t * for all
* known trusted dirservers. Callers must not modify the list or its
* contents.
*/
const smartlist_t *
router_get_trusted_dir_servers(void)
{
if (!trusted_dir_servers)
trusted_dir_servers = smartlist_new();
return trusted_dir_servers;
}
const smartlist_t *
router_get_fallback_dir_servers(void)
{
if (!fallback_dir_servers)
fallback_dir_servers = smartlist_new();
return fallback_dir_servers;
}
/** Try to find a running dirserver that supports operations of <b>type</b>.
*
* If there are no running dirservers in our routerlist and the
* <b>PDS_RETRY_IF_NO_SERVERS</b> flag is set, set all the fallback ones
* (including authorities) as running again, and pick one.
*
* If the <b>PDS_IGNORE_FASCISTFIREWALL</b> flag is set, then include
* dirservers that we can't reach.
*
* If the <b>PDS_ALLOW_SELF</b> flag is not set, then don't include ourself
* (if we're a dirserver).
*
* Don't pick a fallback directory mirror if any non-fallback is viable;
* (the fallback directory mirrors include the authorities)
* try to avoid using servers that have returned 503 recently.
*/
const routerstatus_t *
router_pick_directory_server(dirinfo_type_t type, int flags)
{
int busy = 0;
const routerstatus_t *choice;
if (!routerlist)
return NULL;
choice = router_pick_directory_server_impl(type, flags, &busy);
if (choice || !(flags & PDS_RETRY_IF_NO_SERVERS))
return choice;
if (busy) {
/* If the reason that we got no server is that servers are "busy",
* we must be excluding good servers because we already have serverdesc
* fetches with them. Do not mark down servers up because of this. */
tor_assert((flags & (PDS_NO_EXISTING_SERVERDESC_FETCH|
PDS_NO_EXISTING_MICRODESC_FETCH)));
return NULL;
}
log_info(LD_DIR,
"No reachable router entries for dirservers. "
"Trying them all again.");
/* mark all fallback directory mirrors as up again */
mark_all_dirservers_up(fallback_dir_servers);
/* try again */
choice = router_pick_directory_server_impl(type, flags, NULL);
return choice;
}
/** Return the dir_server_t for the directory authority whose identity
* key hashes to <b>digest</b>, or NULL if no such authority is known.
*/
dir_server_t *
router_get_trusteddirserver_by_digest(const char *digest)
{
if (!trusted_dir_servers)
return NULL;
SMARTLIST_FOREACH(trusted_dir_servers, dir_server_t *, ds,
{
if (tor_memeq(ds->digest, digest, DIGEST_LEN))
return ds;
});
return NULL;
}
/** Return the dir_server_t for the fallback dirserver whose identity
* key hashes to <b>digest</b>, or NULL if no such fallback is in the list of
* fallback_dir_servers. (fallback_dir_servers is affected by the FallbackDir
* and UseDefaultFallbackDirs torrc options.)
* The list of fallback directories includes the list of authorities.
*/
dir_server_t *
router_get_fallback_dirserver_by_digest(const char *digest)
{
if (!fallback_dir_servers)
return NULL;
if (!digest)
return NULL;
SMARTLIST_FOREACH(fallback_dir_servers, dir_server_t *, ds,
{
if (tor_memeq(ds->digest, digest, DIGEST_LEN))
return ds;
});
return NULL;
}
/** Return 1 if any fallback dirserver's identity key hashes to <b>digest</b>,
* or 0 if no such fallback is in the list of fallback_dir_servers.
* (fallback_dir_servers is affected by the FallbackDir and
* UseDefaultFallbackDirs torrc options.)
* The list of fallback directories includes the list of authorities.
*/
int
router_digest_is_fallback_dir(const char *digest)
{
return (router_get_fallback_dirserver_by_digest(digest) != NULL);
}
/** Return the dir_server_t for the directory authority whose
* v3 identity key hashes to <b>digest</b>, or NULL if no such authority
* is known.
*/
MOCK_IMPL(dir_server_t *,
trusteddirserver_get_by_v3_auth_digest, (const char *digest))
{
if (!trusted_dir_servers)
return NULL;
SMARTLIST_FOREACH(trusted_dir_servers, dir_server_t *, ds,
{
if (tor_memeq(ds->v3_identity_digest, digest, DIGEST_LEN) &&
(ds->type & V3_DIRINFO))
return ds;
});
return NULL;
}
/** Try to find a running directory authority. Flags are as for
* router_pick_directory_server.
*/
const routerstatus_t *
router_pick_trusteddirserver(dirinfo_type_t type, int flags)
{
return router_pick_dirserver_generic(trusted_dir_servers, type, flags);
}
/** Try to find a running fallback directory. Flags are as for
* router_pick_directory_server.
*/
const routerstatus_t *
router_pick_fallback_dirserver(dirinfo_type_t type, int flags)
{
return router_pick_dirserver_generic(fallback_dir_servers, type, flags);
}
/** Try to find a running fallback directory. Flags are as for
* router_pick_directory_server.
*/
static const routerstatus_t *
router_pick_dirserver_generic(smartlist_t *sourcelist,
dirinfo_type_t type, int flags)
{
const routerstatus_t *choice;
int busy = 0;
choice = router_pick_trusteddirserver_impl(sourcelist, type, flags, &busy);
if (choice || !(flags & PDS_RETRY_IF_NO_SERVERS))
return choice;
if (busy) {
/* If the reason that we got no server is that servers are "busy",
* we must be excluding good servers because we already have serverdesc
* fetches with them. Do not mark down servers up because of this. */
tor_assert((flags & (PDS_NO_EXISTING_SERVERDESC_FETCH|
PDS_NO_EXISTING_MICRODESC_FETCH)));
return NULL;
}
log_info(LD_DIR,
"No dirservers are reachable. Trying them all again.");
mark_all_dirservers_up(sourcelist);
return router_pick_trusteddirserver_impl(sourcelist, type, flags, NULL);
}
/* Check if we already have a directory fetch from ap, for serverdesc
* (including extrainfo) or microdesc documents.
* If so, return 1, if not, return 0.
* Also returns 0 if addr is NULL, tor_addr_is_null(addr), or dir_port is 0.
*/
STATIC int
router_is_already_dir_fetching(const tor_addr_port_t *ap, int serverdesc,
int microdesc)
{
if (!ap || tor_addr_is_null(&ap->addr) || !ap->port) {
return 0;
}
/* XX/teor - we're not checking tunnel connections here, see #17848
*/
if (serverdesc && (
connection_get_by_type_addr_port_purpose(
CONN_TYPE_DIR, &ap->addr, ap->port, DIR_PURPOSE_FETCH_SERVERDESC)
|| connection_get_by_type_addr_port_purpose(
CONN_TYPE_DIR, &ap->addr, ap->port, DIR_PURPOSE_FETCH_EXTRAINFO))) {
return 1;
}
if (microdesc && (
connection_get_by_type_addr_port_purpose(
CONN_TYPE_DIR, &ap->addr, ap->port, DIR_PURPOSE_FETCH_MICRODESC))) {
return 1;
}
return 0;
}
/* Check if we already have a directory fetch from the ipv4 or ipv6
* router, for serverdesc (including extrainfo) or microdesc documents.
* If so, return 1, if not, return 0.
*/
static int
router_is_already_dir_fetching_(uint32_t ipv4_addr,
const tor_addr_t *ipv6_addr,
uint16_t dir_port,
int serverdesc,
int microdesc)
{
tor_addr_port_t ipv4_dir_ap, ipv6_dir_ap;
/* Assume IPv6 DirPort is the same as IPv4 DirPort */
tor_addr_from_ipv4h(&ipv4_dir_ap.addr, ipv4_addr);
ipv4_dir_ap.port = dir_port;
tor_addr_copy(&ipv6_dir_ap.addr, ipv6_addr);
ipv6_dir_ap.port = dir_port;
return (router_is_already_dir_fetching(&ipv4_dir_ap, serverdesc, microdesc)
|| router_is_already_dir_fetching(&ipv6_dir_ap, serverdesc, microdesc));
}
#ifndef LOG_FALSE_POSITIVES_DURING_BOOTSTRAP
#define LOG_FALSE_POSITIVES_DURING_BOOTSTRAP 0
#endif
/* Log a message if rs is not found or not a preferred address */
static void
router_picked_poor_directory_log(const routerstatus_t *rs)
{
const networkstatus_t *usable_consensus;
usable_consensus = networkstatus_get_reasonably_live_consensus(time(NULL),
usable_consensus_flavor());
#if !LOG_FALSE_POSITIVES_DURING_BOOTSTRAP
/* Don't log early in the bootstrap process, it's normal to pick from a
* small pool of nodes. Of course, this won't help if we're trying to
* diagnose bootstrap issues. */
if (!smartlist_len(nodelist_get_list()) || !usable_consensus
|| !router_have_minimum_dir_info()) {
return;
}
#endif /* !LOG_FALSE_POSITIVES_DURING_BOOTSTRAP */
/* We couldn't find a node, or the one we have doesn't fit our preferences.
* Sometimes this is normal, sometimes it can be a reachability issue. */
if (!rs) {
/* This happens a lot, so it's at debug level */
log_debug(LD_DIR, "Wanted to make an outgoing directory connection, but "
"we couldn't find a directory that fit our criteria. "
"Perhaps we will succeed next time with less strict criteria.");
} else if (!fascist_firewall_allows_rs(rs, FIREWALL_OR_CONNECTION, 1)
&& !fascist_firewall_allows_rs(rs, FIREWALL_DIR_CONNECTION, 1)
) {
/* This is rare, and might be interesting to users trying to diagnose
* connection issues on dual-stack machines. */
log_info(LD_DIR, "Selected a directory %s with non-preferred OR and Dir "
"addresses for launching an outgoing connection: "
"IPv4 %s OR %d Dir %d IPv6 %s OR %d Dir %d",
routerstatus_describe(rs),
fmt_addr32(rs->addr), rs->or_port,
rs->dir_port, fmt_addr(&rs->ipv6_addr),
rs->ipv6_orport, rs->dir_port);
}
}
#undef LOG_FALSE_POSITIVES_DURING_BOOTSTRAP
/** How long do we avoid using a directory server after it's given us a 503? */
#define DIR_503_TIMEOUT (60*60)
/* Common retry code for router_pick_directory_server_impl and
* router_pick_trusteddirserver_impl. Retry with the non-preferred IP version.
* Must be called before RETRY_WITHOUT_EXCLUDE().
*
* If we got no result, and we are applying IP preferences, and we are a
* client that could use an alternate IP version, try again with the
* opposite preferences. */
#define RETRY_ALTERNATE_IP_VERSION(retry_label) \
STMT_BEGIN \
if (result == NULL && try_ip_pref && options->ClientUseIPv4 \
&& fascist_firewall_use_ipv6(options) && !server_mode(options) \
&& !n_busy) { \
n_excluded = 0; \
n_busy = 0; \
try_ip_pref = 0; \
goto retry_label; \
} \
STMT_END \
/* Common retry code for router_pick_directory_server_impl and
* router_pick_trusteddirserver_impl. Retry without excluding nodes, but with
* the preferred IP version. Must be called after RETRY_ALTERNATE_IP_VERSION().
*
* If we got no result, and we are excluding nodes, and StrictNodes is
* not set, try again without excluding nodes. */
#define RETRY_WITHOUT_EXCLUDE(retry_label) \
STMT_BEGIN \
if (result == NULL && try_excluding && !options->StrictNodes \
&& n_excluded && !n_busy) { \
try_excluding = 0; \
n_excluded = 0; \
n_busy = 0; \
try_ip_pref = 1; \
goto retry_label; \
} \
STMT_END
/* Common code used in the loop within router_pick_directory_server_impl and
* router_pick_trusteddirserver_impl.
*
* Check if the given <b>identity</b> supports extrainfo. If not, skip further
* checks.
*/
#define SKIP_MISSING_TRUSTED_EXTRAINFO(type, identity) \
STMT_BEGIN \
int is_trusted_extrainfo = router_digest_is_trusted_dir_type( \
(identity), EXTRAINFO_DIRINFO); \
if (((type) & EXTRAINFO_DIRINFO) && \
!router_supports_extrainfo((identity), is_trusted_extrainfo)) \
continue; \
STMT_END
/* When iterating through the routerlist, can OR address/port preference
* and reachability checks be skipped?
*/
int
router_skip_or_reachability(const or_options_t *options, int try_ip_pref)
{
/* Servers always have and prefer IPv4.
* And if clients are checking against the firewall for reachability only,
* but there's no firewall, don't bother checking */
return server_mode(options) || (!try_ip_pref && !firewall_is_fascist_or());
}
/* When iterating through the routerlist, can Dir address/port preference
* and reachability checks be skipped?
*/
static int
router_skip_dir_reachability(const or_options_t *options, int try_ip_pref)
{
/* Servers always have and prefer IPv4.
* And if clients are checking against the firewall for reachability only,
* but there's no firewall, don't bother checking */
return server_mode(options) || (!try_ip_pref && !firewall_is_fascist_dir());
}
/** Pick a random running valid directory server/mirror from our
* routerlist. Arguments are as for router_pick_directory_server(), except:
*
* If <b>n_busy_out</b> is provided, set *<b>n_busy_out</b> to the number of
* directories that we excluded for no other reason than
* PDS_NO_EXISTING_SERVERDESC_FETCH or PDS_NO_EXISTING_MICRODESC_FETCH.
*/
STATIC const routerstatus_t *
router_pick_directory_server_impl(dirinfo_type_t type, int flags,
int *n_busy_out)
{
const or_options_t *options = get_options();
const node_t *result;
smartlist_t *direct, *tunnel;
smartlist_t *trusted_direct, *trusted_tunnel;
smartlist_t *overloaded_direct, *overloaded_tunnel;
time_t now = time(NULL);
const networkstatus_t *consensus = networkstatus_get_latest_consensus();
const int requireother = ! (flags & PDS_ALLOW_SELF);
const int fascistfirewall = ! (flags & PDS_IGNORE_FASCISTFIREWALL);
const int no_serverdesc_fetching =(flags & PDS_NO_EXISTING_SERVERDESC_FETCH);
const int no_microdesc_fetching = (flags & PDS_NO_EXISTING_MICRODESC_FETCH);
int try_excluding = 1, n_excluded = 0, n_busy = 0;
int try_ip_pref = 1;
if (!consensus)
return NULL;
retry_search:
direct = smartlist_new();
tunnel = smartlist_new();
trusted_direct = smartlist_new();
trusted_tunnel = smartlist_new();
overloaded_direct = smartlist_new();
overloaded_tunnel = smartlist_new();
const int skip_or_fw = router_skip_or_reachability(options, try_ip_pref);
const int skip_dir_fw = router_skip_dir_reachability(options, try_ip_pref);
const int must_have_or = directory_must_use_begindir(options);
/* Find all the running dirservers we know about. */
SMARTLIST_FOREACH_BEGIN(nodelist_get_list(), const node_t *, node) {
int is_trusted;
int is_overloaded;
const routerstatus_t *status = node->rs;
const country_t country = node->country;
if (!status)
continue;
if (!node->is_running || !node_is_dir(node) || !node->is_valid)
continue;
if (requireother && router_digest_is_me(node->identity))
continue;
SKIP_MISSING_TRUSTED_EXTRAINFO(type, node->identity);
if (try_excluding &&
routerset_contains_routerstatus(options->ExcludeNodes, status,
country)) {
++n_excluded;
continue;
}
if (router_is_already_dir_fetching_(status->addr,
&status->ipv6_addr,
status->dir_port,
no_serverdesc_fetching,
no_microdesc_fetching)) {
++n_busy;
continue;
}
is_overloaded = status->last_dir_503_at + DIR_503_TIMEOUT > now;
is_trusted = router_digest_is_trusted_dir(node->identity);
/* Clients use IPv6 addresses if the server has one and the client
* prefers IPv6.
* Add the router if its preferred address and port are reachable.
* If we don't get any routers, we'll try again with the non-preferred
* address for each router (if any). (To ensure correct load-balancing
* we try routers that only have one address both times.)
*/
if (!fascistfirewall || skip_or_fw ||
fascist_firewall_allows_node(node, FIREWALL_OR_CONNECTION,
try_ip_pref))
smartlist_add(is_trusted ? trusted_tunnel :
is_overloaded ? overloaded_tunnel : tunnel, (void*)node);
else if (!must_have_or && (skip_dir_fw ||
fascist_firewall_allows_node(node, FIREWALL_DIR_CONNECTION,
try_ip_pref)))
smartlist_add(is_trusted ? trusted_direct :
is_overloaded ? overloaded_direct : direct, (void*)node);
} SMARTLIST_FOREACH_END(node);
if (smartlist_len(tunnel)) {
result = node_sl_choose_by_bandwidth(tunnel, WEIGHT_FOR_DIR);
} else if (smartlist_len(overloaded_tunnel)) {
result = node_sl_choose_by_bandwidth(overloaded_tunnel,
WEIGHT_FOR_DIR);
} else if (smartlist_len(trusted_tunnel)) {
/* FFFF We don't distinguish between trusteds and overloaded trusteds
* yet. Maybe one day we should. */
/* FFFF We also don't load balance over authorities yet. I think this
* is a feature, but it could easily be a bug. -RD */
result = smartlist_choose(trusted_tunnel);
} else if (smartlist_len(direct)) {
result = node_sl_choose_by_bandwidth(direct, WEIGHT_FOR_DIR);
} else if (smartlist_len(overloaded_direct)) {
result = node_sl_choose_by_bandwidth(overloaded_direct,
WEIGHT_FOR_DIR);
} else {
result = smartlist_choose(trusted_direct);
}
smartlist_free(direct);
smartlist_free(tunnel);
smartlist_free(trusted_direct);
smartlist_free(trusted_tunnel);
smartlist_free(overloaded_direct);
smartlist_free(overloaded_tunnel);
RETRY_ALTERNATE_IP_VERSION(retry_search);
RETRY_WITHOUT_EXCLUDE(retry_search);
if (n_busy_out)
*n_busy_out = n_busy;
router_picked_poor_directory_log(result ? result->rs : NULL);
return result ? result->rs : NULL;
}
/** Pick a random element from a list of dir_server_t, weighting by their
* <b>weight</b> field. */
static const dir_server_t *
dirserver_choose_by_weight(const smartlist_t *servers, double authority_weight)
{
int n = smartlist_len(servers);
int i;
double *weights_dbl;
uint64_t *weights_u64;
const dir_server_t *ds;
weights_dbl = tor_calloc(n, sizeof(double));
weights_u64 = tor_calloc(n, sizeof(uint64_t));
for (i = 0; i < n; ++i) {
ds = smartlist_get(servers, i);
weights_dbl[i] = ds->weight;
if (ds->is_authority)
weights_dbl[i] *= authority_weight;
}
scale_array_elements_to_u64(weights_u64, weights_dbl, n, NULL);
i = choose_array_element_by_weight(weights_u64, n);
tor_free(weights_dbl);
tor_free(weights_u64);
return (i < 0) ? NULL : smartlist_get(servers, i);
}
/** Choose randomly from among the dir_server_ts in sourcelist that
* are up. Flags are as for router_pick_directory_server_impl().
*/
static const routerstatus_t *
router_pick_trusteddirserver_impl(const smartlist_t *sourcelist,
dirinfo_type_t type, int flags,
int *n_busy_out)
{
const or_options_t *options = get_options();
smartlist_t *direct, *tunnel;
smartlist_t *overloaded_direct, *overloaded_tunnel;
const routerinfo_t *me = router_get_my_routerinfo();
const routerstatus_t *result = NULL;
time_t now = time(NULL);
const int requireother = ! (flags & PDS_ALLOW_SELF);
const int fascistfirewall = ! (flags & PDS_IGNORE_FASCISTFIREWALL);
const int no_serverdesc_fetching =(flags & PDS_NO_EXISTING_SERVERDESC_FETCH);
const int no_microdesc_fetching =(flags & PDS_NO_EXISTING_MICRODESC_FETCH);
const double auth_weight = (sourcelist == fallback_dir_servers) ?
options->DirAuthorityFallbackRate : 1.0;
smartlist_t *pick_from;
int n_busy = 0;
int try_excluding = 1, n_excluded = 0;
int try_ip_pref = 1;
if (!sourcelist)
return NULL;
retry_search:
direct = smartlist_new();
tunnel = smartlist_new();
overloaded_direct = smartlist_new();
overloaded_tunnel = smartlist_new();
const int skip_or_fw = router_skip_or_reachability(options, try_ip_pref);
const int skip_dir_fw = router_skip_dir_reachability(options, try_ip_pref);
const int must_have_or = directory_must_use_begindir(options);
SMARTLIST_FOREACH_BEGIN(sourcelist, const dir_server_t *, d)
{
int is_overloaded =
d->fake_status.last_dir_503_at + DIR_503_TIMEOUT > now;
if (!d->is_running) continue;
if ((type & d->type) == 0)
continue;
SKIP_MISSING_TRUSTED_EXTRAINFO(type, d->digest);
if (requireother && me && router_digest_is_me(d->digest))
continue;
if (try_excluding &&
routerset_contains_routerstatus(options->ExcludeNodes,
&d->fake_status, -1)) {
++n_excluded;
continue;
}
if (router_is_already_dir_fetching_(d->addr,
&d->ipv6_addr,
d->dir_port,
no_serverdesc_fetching,
no_microdesc_fetching)) {
++n_busy;
continue;
}
/* Clients use IPv6 addresses if the server has one and the client
* prefers IPv6.
* Add the router if its preferred address and port are reachable.
* If we don't get any routers, we'll try again with the non-preferred
* address for each router (if any). (To ensure correct load-balancing
* we try routers that only have one address both times.)
*/
if (!fascistfirewall || skip_or_fw ||
fascist_firewall_allows_dir_server(d, FIREWALL_OR_CONNECTION,
try_ip_pref))
smartlist_add(is_overloaded ? overloaded_tunnel : tunnel, (void*)d);
else if (!must_have_or && (skip_dir_fw ||
fascist_firewall_allows_dir_server(d, FIREWALL_DIR_CONNECTION,
try_ip_pref)))
smartlist_add(is_overloaded ? overloaded_direct : direct, (void*)d);
}
SMARTLIST_FOREACH_END(d);
if (smartlist_len(tunnel)) {
pick_from = tunnel;
} else if (smartlist_len(overloaded_tunnel)) {
pick_from = overloaded_tunnel;
} else if (smartlist_len(direct)) {
pick_from = direct;
} else {
pick_from = overloaded_direct;
}
{
const dir_server_t *selection =
dirserver_choose_by_weight(pick_from, auth_weight);
if (selection)
result = &selection->fake_status;
}
smartlist_free(direct);
smartlist_free(tunnel);
smartlist_free(overloaded_direct);
smartlist_free(overloaded_tunnel);
RETRY_ALTERNATE_IP_VERSION(retry_search);
RETRY_WITHOUT_EXCLUDE(retry_search);
router_picked_poor_directory_log(result);
if (n_busy_out)
*n_busy_out = n_busy;
return result;
}
/** Mark as running every dir_server_t in <b>server_list</b>. */
static void
mark_all_dirservers_up(smartlist_t *server_list)
{
if (server_list) {
SMARTLIST_FOREACH_BEGIN(server_list, dir_server_t *, dir) {
routerstatus_t *rs;
node_t *node;
dir->is_running = 1;
node = node_get_mutable_by_id(dir->digest);
if (node)
node->is_running = 1;
rs = router_get_mutable_consensus_status_by_id(dir->digest);
if (rs) {
rs->last_dir_503_at = 0;
control_event_networkstatus_changed_single(rs);
}
} SMARTLIST_FOREACH_END(dir);
}
router_dir_info_changed();
}
/** Return true iff r1 and r2 have the same address and OR port. */
int
routers_have_same_or_addrs(const routerinfo_t *r1, const routerinfo_t *r2)
{
return r1->addr == r2->addr && r1->or_port == r2->or_port &&
tor_addr_eq(&r1->ipv6_addr, &r2->ipv6_addr) &&
r1->ipv6_orport == r2->ipv6_orport;
}
/** Reset all internal variables used to count failed downloads of network
* status objects. */
void
router_reset_status_download_failures(void)
{
mark_all_dirservers_up(fallback_dir_servers);
}
/** Given a <b>router</b>, add every node_t in its family (including the
* node itself!) to <b>sl</b>.
*
* Note the type mismatch: This function takes a routerinfo, but adds nodes
* to the smartlist!
*/
static void
routerlist_add_node_and_family(smartlist_t *sl, const routerinfo_t *router)
{
/* XXXX MOVE ? */
node_t fake_node;
const node_t *node = node_get_by_id(router->cache_info.identity_digest);
if (node == NULL) {
memset(&fake_node, 0, sizeof(fake_node));
fake_node.ri = (routerinfo_t *)router;
memcpy(fake_node.identity, router->cache_info.identity_digest, DIGEST_LEN);
node = &fake_node;
}
nodelist_add_node_and_family(sl, node);
}
/** Add every suitable node from our nodelist to <b>sl</b>, so that
* we can pick a node for a circuit.
*/
void
router_add_running_nodes_to_smartlist(smartlist_t *sl, int need_uptime,
int need_capacity, int need_guard,
int need_desc, int pref_addr,
int direct_conn)
{
const int check_reach = !router_skip_or_reachability(get_options(),
pref_addr);
/* XXXX MOVE */
SMARTLIST_FOREACH_BEGIN(nodelist_get_list(), const node_t *, node) {
if (!node->is_running || !node->is_valid)
continue;
if (need_desc && !node_has_preferred_descriptor(node, direct_conn))
continue;
if (node->ri && node->ri->purpose != ROUTER_PURPOSE_GENERAL)
continue;
if (node_is_unreliable(node, need_uptime, need_capacity, need_guard))
continue;
/* Don't choose nodes if we are certain they can't do EXTEND2 cells */
if (node->rs && !routerstatus_version_supports_extend2_cells(node->rs, 1))
continue;
/* Don't choose nodes if we are certain they can't do ntor. */
if ((node->ri || node->md) && !node_has_curve25519_onion_key(node))
continue;
/* Choose a node with an OR address that matches the firewall rules */
if (direct_conn && check_reach &&
!fascist_firewall_allows_node(node,
FIREWALL_OR_CONNECTION,
pref_addr))
continue;
smartlist_add(sl, (void *)node);
} SMARTLIST_FOREACH_END(node);
}
/** Look through the routerlist until we find a router that has my key.
Return it. */
const routerinfo_t *
routerlist_find_my_routerinfo(void)
{
if (!routerlist)
return NULL;
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, router,
{
if (router_is_me(router))
return router;
});
return NULL;
}
/** Return the smaller of the router's configured BandwidthRate
* and its advertised capacity. */
uint32_t
router_get_advertised_bandwidth(const routerinfo_t *router)
{
if (router->bandwidthcapacity < router->bandwidthrate)
return router->bandwidthcapacity;
return router->bandwidthrate;
}
/** Do not weight any declared bandwidth more than this much when picking
* routers by bandwidth. */
#define DEFAULT_MAX_BELIEVABLE_BANDWIDTH 10000000 /* 10 MB/sec */
/** Return the smaller of the router's configured BandwidthRate
* and its advertised capacity, capped by max-believe-bw. */
uint32_t
router_get_advertised_bandwidth_capped(const routerinfo_t *router)
{
uint32_t result = router->bandwidthcapacity;
if (result > router->bandwidthrate)
result = router->bandwidthrate;
if (result > DEFAULT_MAX_BELIEVABLE_BANDWIDTH)
result = DEFAULT_MAX_BELIEVABLE_BANDWIDTH;
return result;
}
/** Given an array of double/uint64_t unions that are currently being used as
* doubles, convert them to uint64_t, and try to scale them linearly so as to
* much of the range of uint64_t. If <b>total_out</b> is provided, set it to
* the sum of all elements in the array _before_ scaling. */
STATIC void
scale_array_elements_to_u64(uint64_t *entries_out, const double *entries_in,
int n_entries,
uint64_t *total_out)
{
double total = 0.0;
double scale_factor = 0.0;
int i;
for (i = 0; i < n_entries; ++i)
total += entries_in[i];
if (total > 0.0) {
scale_factor = ((double)INT64_MAX) / total;
scale_factor /= 4.0; /* make sure we're very far away from overflowing */
}
for (i = 0; i < n_entries; ++i)
entries_out[i] = tor_llround(entries_in[i] * scale_factor);
if (total_out)
*total_out = (uint64_t) total;
}
/** Pick a random element of <b>n_entries</b>-element array <b>entries</b>,
* choosing each element with a probability proportional to its (uint64_t)
* value, and return the index of that element. If all elements are 0, choose
* an index at random. Return -1 on error.
*/
STATIC int
choose_array_element_by_weight(const uint64_t *entries, int n_entries)
{
int i;
uint64_t rand_val;
uint64_t total = 0;
for (i = 0; i < n_entries; ++i)
total += entries[i];
if (n_entries < 1)
return -1;
if (total == 0)
return crypto_rand_int(n_entries);
tor_assert(total < INT64_MAX);
rand_val = crypto_rand_uint64(total);
return select_array_member_cumulative_timei(
entries, n_entries, total, rand_val);
}
/** When weighting bridges, enforce these values as lower and upper
* bound for believable bandwidth, because there is no way for us
* to verify a bridge's bandwidth currently. */
#define BRIDGE_MIN_BELIEVABLE_BANDWIDTH 20000 /* 20 kB/sec */
#define BRIDGE_MAX_BELIEVABLE_BANDWIDTH 100000 /* 100 kB/sec */
/** Return the smaller of the router's configured BandwidthRate
* and its advertised capacity, making sure to stay within the
* interval between bridge-min-believe-bw and
* bridge-max-believe-bw. */
static uint32_t
bridge_get_advertised_bandwidth_bounded(routerinfo_t *router)
{
uint32_t result = router->bandwidthcapacity;
if (result > router->bandwidthrate)
result = router->bandwidthrate;
if (result > BRIDGE_MAX_BELIEVABLE_BANDWIDTH)
result = BRIDGE_MAX_BELIEVABLE_BANDWIDTH;
else if (result < BRIDGE_MIN_BELIEVABLE_BANDWIDTH)
result = BRIDGE_MIN_BELIEVABLE_BANDWIDTH;
return result;
}
/** Return bw*1000, unless bw*1000 would overflow, in which case return
* INT32_MAX. */
static inline int32_t
kb_to_bytes(uint32_t bw)
{
return (bw > (INT32_MAX/1000)) ? INT32_MAX : bw*1000;
}
/** Helper function:
* choose a random element of smartlist <b>sl</b> of nodes, weighted by
* the advertised bandwidth of each element using the consensus
* bandwidth weights.
*
* If <b>rule</b>==WEIGHT_FOR_EXIT. we're picking an exit node: consider all
* nodes' bandwidth equally regardless of their Exit status, since there may
* be some in the list because they exit to obscure ports. If
* <b>rule</b>==NO_WEIGHTING, we're picking a non-exit node: weight
* exit-node's bandwidth less depending on the smallness of the fraction of
* Exit-to-total bandwidth. If <b>rule</b>==WEIGHT_FOR_GUARD, we're picking a
* guard node: consider all guard's bandwidth equally. Otherwise, weight
* guards proportionally less.
*/
static const node_t *
smartlist_choose_node_by_bandwidth_weights(const smartlist_t *sl,
bandwidth_weight_rule_t rule)
{
double *bandwidths_dbl=NULL;
uint64_t *bandwidths_u64=NULL;
if (compute_weighted_bandwidths(sl, rule, &bandwidths_dbl, NULL) < 0)
return NULL;
bandwidths_u64 = tor_calloc(smartlist_len(sl), sizeof(uint64_t));
scale_array_elements_to_u64(bandwidths_u64, bandwidths_dbl,
smartlist_len(sl), NULL);
{
int idx = choose_array_element_by_weight(bandwidths_u64,
smartlist_len(sl));
tor_free(bandwidths_dbl);
tor_free(bandwidths_u64);
return idx < 0 ? NULL : smartlist_get(sl, idx);
}
}
/** Given a list of routers and a weighting rule as in
* smartlist_choose_node_by_bandwidth_weights, compute weighted bandwidth
* values for each node and store them in a freshly allocated
* *<b>bandwidths_out</b> of the same length as <b>sl</b>, and holding results
* as doubles. If <b>total_bandwidth_out</b> is non-NULL, set it to the total
* of all the bandwidths.
* Return 0 on success, -1 on failure. */
static int
compute_weighted_bandwidths(const smartlist_t *sl,
bandwidth_weight_rule_t rule,
double **bandwidths_out,
double *total_bandwidth_out)
{
int64_t weight_scale;
double Wg = -1, Wm = -1, We = -1, Wd = -1;
double Wgb = -1, Wmb = -1, Web = -1, Wdb = -1;
guardfraction_bandwidth_t guardfraction_bw;
double *bandwidths = NULL;
double total_bandwidth = 0.0;
tor_assert(sl);
tor_assert(bandwidths_out);
/* Can't choose exit and guard at same time */
tor_assert(rule == NO_WEIGHTING ||
rule == WEIGHT_FOR_EXIT ||
rule == WEIGHT_FOR_GUARD ||
rule == WEIGHT_FOR_MID ||
rule == WEIGHT_FOR_DIR);
*bandwidths_out = NULL;
if (total_bandwidth_out) {
*total_bandwidth_out = 0.0;
}
if (smartlist_len(sl) == 0) {
log_info(LD_CIRC,
"Empty routerlist passed in to consensus weight node "
"selection for rule %s",
bandwidth_weight_rule_to_string(rule));
return -1;
}
weight_scale = networkstatus_get_weight_scale_param(NULL);
if (rule == WEIGHT_FOR_GUARD) {
Wg = networkstatus_get_bw_weight(NULL, "Wgg", -1);
Wm = networkstatus_get_bw_weight(NULL, "Wgm", -1); /* Bridges */
We = 0;
Wd = networkstatus_get_bw_weight(NULL, "Wgd", -1);
Wgb = networkstatus_get_bw_weight(NULL, "Wgb", -1);
Wmb = networkstatus_get_bw_weight(NULL, "Wmb", -1);
Web = networkstatus_get_bw_weight(NULL, "Web", -1);
Wdb = networkstatus_get_bw_weight(NULL, "Wdb", -1);
} else if (rule == WEIGHT_FOR_MID) {
Wg = networkstatus_get_bw_weight(NULL, "Wmg", -1);
Wm = networkstatus_get_bw_weight(NULL, "Wmm", -1);
We = networkstatus_get_bw_weight(NULL, "Wme", -1);
Wd = networkstatus_get_bw_weight(NULL, "Wmd", -1);
Wgb = networkstatus_get_bw_weight(NULL, "Wgb", -1);
Wmb = networkstatus_get_bw_weight(NULL, "Wmb", -1);
Web = networkstatus_get_bw_weight(NULL, "Web", -1);
Wdb = networkstatus_get_bw_weight(NULL, "Wdb", -1);
} else if (rule == WEIGHT_FOR_EXIT) {
// Guards CAN be exits if they have weird exit policies
// They are d then I guess...
We = networkstatus_get_bw_weight(NULL, "Wee", -1);
Wm = networkstatus_get_bw_weight(NULL, "Wem", -1); /* Odd exit policies */
Wd = networkstatus_get_bw_weight(NULL, "Wed", -1);
Wg = networkstatus_get_bw_weight(NULL, "Weg", -1); /* Odd exit policies */
Wgb = networkstatus_get_bw_weight(NULL, "Wgb", -1);
Wmb = networkstatus_get_bw_weight(NULL, "Wmb", -1);
Web = networkstatus_get_bw_weight(NULL, "Web", -1);
Wdb = networkstatus_get_bw_weight(NULL, "Wdb", -1);
} else if (rule == WEIGHT_FOR_DIR) {
We = networkstatus_get_bw_weight(NULL, "Wbe", -1);
Wm = networkstatus_get_bw_weight(NULL, "Wbm", -1);
Wd = networkstatus_get_bw_weight(NULL, "Wbd", -1);
Wg = networkstatus_get_bw_weight(NULL, "Wbg", -1);
Wgb = Wmb = Web = Wdb = weight_scale;
} else if (rule == NO_WEIGHTING) {
Wg = Wm = We = Wd = weight_scale;
Wgb = Wmb = Web = Wdb = weight_scale;
}
if (Wg < 0 || Wm < 0 || We < 0 || Wd < 0 || Wgb < 0 || Wmb < 0 || Wdb < 0
|| Web < 0) {
log_debug(LD_CIRC,
"Got negative bandwidth weights. Defaulting to naive selection"
" algorithm.");
Wg = Wm = We = Wd = weight_scale;
Wgb = Wmb = Web = Wdb = weight_scale;
}
Wg /= weight_scale;
Wm /= weight_scale;
We /= weight_scale;
Wd /= weight_scale;
Wgb /= weight_scale;
Wmb /= weight_scale;
Web /= weight_scale;
Wdb /= weight_scale;
bandwidths = tor_calloc(smartlist_len(sl), sizeof(double));
// Cycle through smartlist and total the bandwidth.
static int warned_missing_bw = 0;
SMARTLIST_FOREACH_BEGIN(sl, const node_t *, node) {
int is_exit = 0, is_guard = 0, is_dir = 0, this_bw = 0;
double weight = 1;
double weight_without_guard_flag = 0; /* Used for guardfraction */
double final_weight = 0;
is_exit = node->is_exit && ! node->is_bad_exit;
is_guard = node->is_possible_guard;
is_dir = node_is_dir(node);
if (node->rs) {
if (!node->rs->has_bandwidth) {
/* This should never happen, unless all the authorities downgrade
* to 0.2.0 or rogue routerstatuses get inserted into our consensus. */
if (! warned_missing_bw) {
log_warn(LD_BUG,
"Consensus is missing some bandwidths. Using a naive "
"router selection algorithm");
warned_missing_bw = 1;
}
this_bw = 30000; /* Chosen arbitrarily */
} else {
this_bw = kb_to_bytes(node->rs->bandwidth_kb);
}
} else if (node->ri) {
/* bridge or other descriptor not in our consensus */
this_bw = bridge_get_advertised_bandwidth_bounded(node->ri);
} else {
/* We can't use this one. */
continue;
}
if (is_guard && is_exit) {
weight = (is_dir ? Wdb*Wd : Wd);
weight_without_guard_flag = (is_dir ? Web*We : We);
} else if (is_guard) {
weight = (is_dir ? Wgb*Wg : Wg);
weight_without_guard_flag = (is_dir ? Wmb*Wm : Wm);
} else if (is_exit) {
weight = (is_dir ? Web*We : We);
} else { // middle
weight = (is_dir ? Wmb*Wm : Wm);
}
/* These should be impossible; but overflows here would be bad, so let's
* make sure. */
if (this_bw < 0)
this_bw = 0;
if (weight < 0.0)
weight = 0.0;
if (weight_without_guard_flag < 0.0)
weight_without_guard_flag = 0.0;
/* If guardfraction information is available in the consensus, we
* want to calculate this router's bandwidth according to its
* guardfraction. Quoting from proposal236:
*
* Let Wpf denote the weight from the 'bandwidth-weights' line a
* client would apply to N for position p if it had the guard
* flag, Wpn the weight if it did not have the guard flag, and B the
* measured bandwidth of N in the consensus. Then instead of choosing
* N for position p proportionally to Wpf*B or Wpn*B, clients should
* choose N proportionally to F*Wpf*B + (1-F)*Wpn*B.
*/
if (node->rs && node->rs->has_guardfraction && rule != WEIGHT_FOR_GUARD) {
/* XXX The assert should actually check for is_guard. However,
* that crashes dirauths because of #13297. This should be
* equivalent: */
tor_assert(node->rs->is_possible_guard);
guard_get_guardfraction_bandwidth(&guardfraction_bw,
this_bw,
node->rs->guardfraction_percentage);
/* Calculate final_weight = F*Wpf*B + (1-F)*Wpn*B */
final_weight =
guardfraction_bw.guard_bw * weight +
guardfraction_bw.non_guard_bw * weight_without_guard_flag;
log_debug(LD_GENERAL, "%s: Guardfraction weight %f instead of %f (%s)",
node->rs->nickname, final_weight, weight*this_bw,
bandwidth_weight_rule_to_string(rule));
} else { /* no guardfraction information. calculate the weight normally. */
final_weight = weight*this_bw;
}
bandwidths[node_sl_idx] = final_weight;
total_bandwidth += final_weight;
} SMARTLIST_FOREACH_END(node);
log_debug(LD_CIRC, "Generated weighted bandwidths for rule %s based "
"on weights "
"Wg=%f Wm=%f We=%f Wd=%f with total bw %f",
bandwidth_weight_rule_to_string(rule),
Wg, Wm, We, Wd, total_bandwidth);
*bandwidths_out = bandwidths;
if (total_bandwidth_out) {
*total_bandwidth_out = total_bandwidth;
}
return 0;
}
/** For all nodes in <b>sl</b>, return the fraction of those nodes, weighted
* by their weighted bandwidths with rule <b>rule</b>, for which we have
* descriptors. */
double
frac_nodes_with_descriptors(const smartlist_t *sl,
bandwidth_weight_rule_t rule)
{
double *bandwidths = NULL;
double total, present;
if (smartlist_len(sl) == 0)
return 0.0;
if (compute_weighted_bandwidths(sl, rule, &bandwidths, &total) < 0 ||
total <= 0.0) {
int n_with_descs = 0;
SMARTLIST_FOREACH(sl, const node_t *, node, {
if (node_has_any_descriptor(node))
n_with_descs++;
});
return ((double)n_with_descs) / (double)smartlist_len(sl);
}
present = 0.0;
SMARTLIST_FOREACH_BEGIN(sl, const node_t *, node) {
if (node_has_any_descriptor(node))
present += bandwidths[node_sl_idx];
} SMARTLIST_FOREACH_END(node);
tor_free(bandwidths);
return present / total;
}
/** Choose a random element of status list <b>sl</b>, weighted by
* the advertised bandwidth of each node */
const node_t *
node_sl_choose_by_bandwidth(const smartlist_t *sl,
bandwidth_weight_rule_t rule)
{ /*XXXX MOVE */
return smartlist_choose_node_by_bandwidth_weights(sl, rule);
}
/** Return a random running node from the nodelist. Never
* pick a node that is in
* <b>excludedsmartlist</b>, or which matches <b>excludedset</b>,
* even if they are the only nodes available.
* If <b>CRN_NEED_UPTIME</b> is set in flags and any router has more than
* a minimum uptime, return one of those.
* If <b>CRN_NEED_CAPACITY</b> is set in flags, weight your choice by the
* advertised capacity of each router.
* If <b>CRN_NEED_GUARD</b> is set in flags, consider only Guard routers.
* If <b>CRN_WEIGHT_AS_EXIT</b> is set in flags, we weight bandwidths as if
* picking an exit node, otherwise we weight bandwidths for picking a relay
* node (that is, possibly discounting exit nodes).
* If <b>CRN_NEED_DESC</b> is set in flags, we only consider nodes that
* have a routerinfo or microdescriptor -- that is, enough info to be
* used to build a circuit.
* If <b>CRN_PREF_ADDR</b> is set in flags, we only consider nodes that
* have an address that is preferred by the ClientPreferIPv6ORPort setting
* (regardless of this flag, we exclude nodes that aren't allowed by the
* firewall, including ClientUseIPv4 0 and fascist_firewall_use_ipv6() == 0).
*/
const node_t *
router_choose_random_node(smartlist_t *excludedsmartlist,
routerset_t *excludedset,
router_crn_flags_t flags)
{ /* XXXX MOVE */
const int need_uptime = (flags & CRN_NEED_UPTIME) != 0;
const int need_capacity = (flags & CRN_NEED_CAPACITY) != 0;
const int need_guard = (flags & CRN_NEED_GUARD) != 0;
const int weight_for_exit = (flags & CRN_WEIGHT_AS_EXIT) != 0;
const int need_desc = (flags & CRN_NEED_DESC) != 0;
const int pref_addr = (flags & CRN_PREF_ADDR) != 0;
const int direct_conn = (flags & CRN_DIRECT_CONN) != 0;
const int rendezvous_v3 = (flags & CRN_RENDEZVOUS_V3) != 0;
smartlist_t *sl=smartlist_new(),
*excludednodes=smartlist_new();
const node_t *choice = NULL;
const routerinfo_t *r;
bandwidth_weight_rule_t rule;
tor_assert(!(weight_for_exit && need_guard));
rule = weight_for_exit ? WEIGHT_FOR_EXIT :
(need_guard ? WEIGHT_FOR_GUARD : WEIGHT_FOR_MID);
SMARTLIST_FOREACH_BEGIN(nodelist_get_list(), node_t *, node) {
if (node_allows_single_hop_exits(node)) {
/* Exclude relays that allow single hop exit circuits. This is an
* obsolete option since 0.2.9.2-alpha and done by default in
* 0.3.1.0-alpha. */
smartlist_add(excludednodes, node);
} else if (rendezvous_v3 &&
!node_supports_v3_rendezvous_point(node)) {
/* Exclude relays that do not support to rendezvous for a hidden service
* version 3. */
smartlist_add(excludednodes, node);
}
} SMARTLIST_FOREACH_END(node);
/* If the node_t is not found we won't be to exclude ourself but we
* won't be able to pick ourself in router_choose_random_node() so
* this is fine to at least try with our routerinfo_t object. */
if ((r = router_get_my_routerinfo()))
routerlist_add_node_and_family(excludednodes, r);
router_add_running_nodes_to_smartlist(sl, need_uptime, need_capacity,
need_guard, need_desc, pref_addr,
direct_conn);
log_debug(LD_CIRC,
"We found %d running nodes.",
smartlist_len(sl));
smartlist_subtract(sl,excludednodes);
log_debug(LD_CIRC,
"We removed %d excludednodes, leaving %d nodes.",
smartlist_len(excludednodes),
smartlist_len(sl));
if (excludedsmartlist) {
smartlist_subtract(sl,excludedsmartlist);
log_debug(LD_CIRC,
"We removed %d excludedsmartlist, leaving %d nodes.",
smartlist_len(excludedsmartlist),
smartlist_len(sl));
}
if (excludedset) {
routerset_subtract_nodes(sl,excludedset);
log_debug(LD_CIRC,
"We removed excludedset, leaving %d nodes.",
smartlist_len(sl));
}
// Always weight by bandwidth
choice = node_sl_choose_by_bandwidth(sl, rule);
smartlist_free(sl);
if (!choice && (need_uptime || need_capacity || need_guard || pref_addr)) {
/* try once more -- recurse but with fewer restrictions. */
log_info(LD_CIRC,
"We couldn't find any live%s%s%s routers; falling back "
"to list of all routers.",
need_capacity?", fast":"",
need_uptime?", stable":"",
need_guard?", guard":"");
flags &= ~ (CRN_NEED_UPTIME|CRN_NEED_CAPACITY|CRN_NEED_GUARD|
CRN_PREF_ADDR);
choice = router_choose_random_node(
excludedsmartlist, excludedset, flags);
}
smartlist_free(excludednodes);
if (!choice) {
log_warn(LD_CIRC,
"No available nodes when trying to choose node. Failing.");
}
return choice;
}
/** Helper: given an extended nickname in <b>hexdigest</b> try to decode it.
* Return 0 on success, -1 on failure. Store the result into the
* DIGEST_LEN-byte buffer at <b>digest_out</b>, the single character at
* <b>nickname_qualifier_char_out</b>, and the MAXNICKNAME_LEN+1-byte buffer
* at <b>nickname_out</b>.
*
* The recognized format is:
* HexName = Dollar? HexDigest NamePart?
* Dollar = '?'
* HexDigest = HexChar*20
* HexChar = 'a'..'f' | 'A'..'F' | '0'..'9'
* NamePart = QualChar Name
* QualChar = '=' | '~'
* Name = NameChar*(1..MAX_NICKNAME_LEN)
* NameChar = Any ASCII alphanumeric character
*/
int
hex_digest_nickname_decode(const char *hexdigest,
char *digest_out,
char *nickname_qualifier_char_out,
char *nickname_out)
{
size_t len;
tor_assert(hexdigest);
if (hexdigest[0] == '$')
++hexdigest;
len = strlen(hexdigest);
if (len < HEX_DIGEST_LEN) {
return -1;
} else if (len > HEX_DIGEST_LEN && (hexdigest[HEX_DIGEST_LEN] == '=' ||
hexdigest[HEX_DIGEST_LEN] == '~') &&
len <= HEX_DIGEST_LEN+1+MAX_NICKNAME_LEN) {
*nickname_qualifier_char_out = hexdigest[HEX_DIGEST_LEN];
strlcpy(nickname_out, hexdigest+HEX_DIGEST_LEN+1 , MAX_NICKNAME_LEN+1);
} else if (len == HEX_DIGEST_LEN) {
;
} else {
return -1;
}
if (base16_decode(digest_out, DIGEST_LEN,
hexdigest, HEX_DIGEST_LEN) != DIGEST_LEN)
return -1;
return 0;
}
/** Helper: Return true iff the <b>identity_digest</b> and <b>nickname</b>
* combination of a router, encoded in hexadecimal, matches <b>hexdigest</b>
* (which is optionally prefixed with a single dollar sign). Return false if
* <b>hexdigest</b> is malformed, or it doesn't match. */
int
hex_digest_nickname_matches(const char *hexdigest, const char *identity_digest,
const char *nickname)
{
char digest[DIGEST_LEN];
char nn_char='\0';
char nn_buf[MAX_NICKNAME_LEN+1];
if (hex_digest_nickname_decode(hexdigest, digest, &nn_char, nn_buf) == -1)
return 0;
if (nn_char == '=') {
return 0;
}
if (nn_char == '~') {
if (!nickname) // XXX This seems wrong. -NM
return 0;
if (strcasecmp(nn_buf, nickname))
return 0;
}
return tor_memeq(digest, identity_digest, DIGEST_LEN);
}
/** Return true iff <b>digest</b> is the digest of the identity key of a
* trusted directory matching at least one bit of <b>type</b>. If <b>type</b>
* is zero (NO_DIRINFO), or ALL_DIRINFO, any authority is okay. */
int
router_digest_is_trusted_dir_type(const char *digest, dirinfo_type_t type)
{
if (!trusted_dir_servers)
return 0;
if (authdir_mode(get_options()) && router_digest_is_me(digest))
return 1;
SMARTLIST_FOREACH(trusted_dir_servers, dir_server_t *, ent,
if (tor_memeq(digest, ent->digest, DIGEST_LEN)) {
return (!type) || ((type & ent->type) != 0);
});
return 0;
}
/** If hexdigest is correctly formed, base16_decode it into
* digest, which must have DIGEST_LEN space in it.
* Return 0 on success, -1 on failure.
*/
int
hexdigest_to_digest(const char *hexdigest, char *digest)
{
if (hexdigest[0]=='$')
++hexdigest;
if (strlen(hexdigest) < HEX_DIGEST_LEN ||
base16_decode(digest,DIGEST_LEN,hexdigest,HEX_DIGEST_LEN) != DIGEST_LEN)
return -1;
return 0;
}
/** As router_get_by_id_digest,but return a pointer that you're allowed to
* modify */
routerinfo_t *
router_get_mutable_by_digest(const char *digest)
{
tor_assert(digest);
if (!routerlist) return NULL;
// routerlist_assert_ok(routerlist);
return rimap_get(routerlist->identity_map, digest);
}
/** Return the router in our routerlist whose 20-byte key digest
* is <b>digest</b>. Return NULL if no such router is known. */
const routerinfo_t *
router_get_by_id_digest(const char *digest)
{
return router_get_mutable_by_digest(digest);
}
/** Return the router in our routerlist whose 20-byte descriptor
* is <b>digest</b>. Return NULL if no such router is known. */
signed_descriptor_t *
router_get_by_descriptor_digest(const char *digest)
{
tor_assert(digest);
if (!routerlist) return NULL;
return sdmap_get(routerlist->desc_digest_map, digest);
}
/** Return the signed descriptor for the router in our routerlist whose
* 20-byte extra-info digest is <b>digest</b>. Return NULL if no such router
* is known. */
MOCK_IMPL(signed_descriptor_t *,
router_get_by_extrainfo_digest,(const char *digest))
{
tor_assert(digest);
if (!routerlist) return NULL;
return sdmap_get(routerlist->desc_by_eid_map, digest);
}
/** Return the signed descriptor for the extrainfo_t in our routerlist whose
* extra-info-digest is <b>digest</b>. Return NULL if no such extra-info
* document is known. */
MOCK_IMPL(signed_descriptor_t *,
extrainfo_get_by_descriptor_digest,(const char *digest))
{
extrainfo_t *ei;
tor_assert(digest);
if (!routerlist) return NULL;
ei = eimap_get(routerlist->extra_info_map, digest);
return ei ? &ei->cache_info : NULL;
}
/** Return a pointer to the signed textual representation of a descriptor.
* The returned string is not guaranteed to be NUL-terminated: the string's
* length will be in desc-\>signed_descriptor_len.
*
* If <b>with_annotations</b> is set, the returned string will include
* the annotations
* (if any) preceding the descriptor. This will increase the length of the
* string by desc-\>annotations_len.
*
* The caller must not free the string returned.
*/
static const char *
signed_descriptor_get_body_impl(const signed_descriptor_t *desc,
int with_annotations)
{
const char *r = NULL;
size_t len = desc->signed_descriptor_len;
off_t offset = desc->saved_offset;
if (with_annotations)
len += desc->annotations_len;
else
offset += desc->annotations_len;
tor_assert(len > 32);
if (desc->saved_location == SAVED_IN_CACHE && routerlist) {
desc_store_t *store = desc_get_store(router_get_routerlist(), desc);
if (store && store->mmap) {
tor_assert(desc->saved_offset + len <= store->mmap->size);
r = store->mmap->data + offset;
} else if (store) {
log_err(LD_DIR, "We couldn't read a descriptor that is supposedly "
"mmaped in our cache. Is another process running in our data "
"directory? Exiting.");
exit(1); // XXXX bad exit: should recover.
}
}
if (!r) /* no mmap, or not in cache. */
r = desc->signed_descriptor_body +
(with_annotations ? 0 : desc->annotations_len);
tor_assert(r);
if (!with_annotations) {
if (fast_memcmp("router ", r, 7) && fast_memcmp("extra-info ", r, 11)) {
char *cp = tor_strndup(r, 64);
log_err(LD_DIR, "descriptor at %p begins with unexpected string %s. "
"Is another process running in our data directory? Exiting.",
desc, escaped(cp));
exit(1); // XXXX bad exit: should recover.
}
}
return r;
}
/** Return a pointer to the signed textual representation of a descriptor.
* The returned string is not guaranteed to be NUL-terminated: the string's
* length will be in desc-\>signed_descriptor_len.
*
* The caller must not free the string returned.
*/
const char *
signed_descriptor_get_body(const signed_descriptor_t *desc)
{
return signed_descriptor_get_body_impl(desc, 0);
}
/** As signed_descriptor_get_body(), but points to the beginning of the
* annotations section rather than the beginning of the descriptor. */
const char *
signed_descriptor_get_annotations(const signed_descriptor_t *desc)
{
return signed_descriptor_get_body_impl(desc, 1);
}
/** Return the current list of all known routers. */
routerlist_t *
router_get_routerlist(void)
{
if (PREDICT_UNLIKELY(!routerlist)) {
routerlist = tor_malloc_zero(sizeof(routerlist_t));
routerlist->routers = smartlist_new();
routerlist->old_routers = smartlist_new();
routerlist->identity_map = rimap_new();
routerlist->desc_digest_map = sdmap_new();
routerlist->desc_by_eid_map = sdmap_new();
routerlist->extra_info_map = eimap_new();
routerlist->desc_store.fname_base = "cached-descriptors";
routerlist->extrainfo_store.fname_base = "cached-extrainfo";
routerlist->desc_store.type = ROUTER_STORE;
routerlist->extrainfo_store.type = EXTRAINFO_STORE;
routerlist->desc_store.description = "router descriptors";
routerlist->extrainfo_store.description = "extra-info documents";
}
return routerlist;
}
/** Free all storage held by <b>router</b>. */
void
routerinfo_free_(routerinfo_t *router)
{
if (!router)
return;
tor_free(router->cache_info.signed_descriptor_body);
tor_free(router->nickname);
tor_free(router->platform);
tor_free(router->protocol_list);
tor_free(router->contact_info);
if (router->onion_pkey)
crypto_pk_free(router->onion_pkey);
tor_free(router->onion_curve25519_pkey);
if (router->identity_pkey)
crypto_pk_free(router->identity_pkey);
tor_cert_free(router->cache_info.signing_key_cert);
if (router->declared_family) {
SMARTLIST_FOREACH(router->declared_family, char *, s, tor_free(s));
smartlist_free(router->declared_family);
}
addr_policy_list_free(router->exit_policy);
short_policy_free(router->ipv6_exit_policy);
memset(router, 77, sizeof(routerinfo_t));
tor_free(router);
}
/** Release all storage held by <b>extrainfo</b> */
void
extrainfo_free_(extrainfo_t *extrainfo)
{
if (!extrainfo)
return;
tor_cert_free(extrainfo->cache_info.signing_key_cert);
tor_free(extrainfo->cache_info.signed_descriptor_body);
tor_free(extrainfo->pending_sig);
memset(extrainfo, 88, sizeof(extrainfo_t)); /* debug bad memory usage */
tor_free(extrainfo);
}
#define signed_descriptor_free(val) \
FREE_AND_NULL(signed_descriptor_t, signed_descriptor_free_, (val))
/** Release storage held by <b>sd</b>. */
static void
signed_descriptor_free_(signed_descriptor_t *sd)
{
if (!sd)
return;
tor_free(sd->signed_descriptor_body);
tor_cert_free(sd->signing_key_cert);
memset(sd, 99, sizeof(signed_descriptor_t)); /* Debug bad mem usage */
tor_free(sd);
}
/** Reset the given signed descriptor <b>sd</b> by freeing the allocated
* memory inside the object and by zeroing its content. */
static void
signed_descriptor_reset(signed_descriptor_t *sd)
{
tor_assert(sd);
tor_free(sd->signed_descriptor_body);
tor_cert_free(sd->signing_key_cert);
memset(sd, 0, sizeof(*sd));
}
/** Copy src into dest, and steal all references inside src so that when
* we free src, we don't mess up dest. */
static void
signed_descriptor_move(signed_descriptor_t *dest,
signed_descriptor_t *src)
{
tor_assert(dest != src);
/* Cleanup destination object before overwriting it.*/
signed_descriptor_reset(dest);
memcpy(dest, src, sizeof(signed_descriptor_t));
src->signed_descriptor_body = NULL;
src->signing_key_cert = NULL;
dest->routerlist_index = -1;
}
/** Extract a signed_descriptor_t from a general routerinfo, and free the
* routerinfo.
*/
static signed_descriptor_t *
signed_descriptor_from_routerinfo(routerinfo_t *ri)
{
signed_descriptor_t *sd;
tor_assert(ri->purpose == ROUTER_PURPOSE_GENERAL);
sd = tor_malloc_zero(sizeof(signed_descriptor_t));
signed_descriptor_move(sd, &ri->cache_info);
routerinfo_free(ri);
return sd;
}
/** Helper: free the storage held by the extrainfo_t in <b>e</b>. */
static void
extrainfo_free_void(void *e)
{
extrainfo_free_(e);
}
/** Free all storage held by a routerlist <b>rl</b>. */
void
routerlist_free_(routerlist_t *rl)
{
if (!rl)
return;
rimap_free(rl->identity_map, NULL);
sdmap_free(rl->desc_digest_map, NULL);
sdmap_free(rl->desc_by_eid_map, NULL);
eimap_free(rl->extra_info_map, extrainfo_free_void);
SMARTLIST_FOREACH(rl->routers, routerinfo_t *, r,
routerinfo_free(r));
SMARTLIST_FOREACH(rl->old_routers, signed_descriptor_t *, sd,
signed_descriptor_free(sd));
smartlist_free(rl->routers);
smartlist_free(rl->old_routers);
if (rl->desc_store.mmap) {
int res = tor_munmap_file(routerlist->desc_store.mmap);
if (res != 0) {
log_warn(LD_FS, "Failed to munmap routerlist->desc_store.mmap");
}
}
if (rl->extrainfo_store.mmap) {
int res = tor_munmap_file(routerlist->extrainfo_store.mmap);
if (res != 0) {
log_warn(LD_FS, "Failed to munmap routerlist->extrainfo_store.mmap");
}
}
tor_free(rl);
router_dir_info_changed();
}
/** Log information about how much memory is being used for routerlist,
* at log level <b>severity</b>. */
void
dump_routerlist_mem_usage(int severity)
{
uint64_t livedescs = 0;
uint64_t olddescs = 0;
if (!routerlist)
return;
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, r,
livedescs += r->cache_info.signed_descriptor_len);
SMARTLIST_FOREACH(routerlist->old_routers, signed_descriptor_t *, sd,
olddescs += sd->signed_descriptor_len);
tor_log(severity, LD_DIR,
"In %d live descriptors: "U64_FORMAT" bytes. "
"In %d old descriptors: "U64_FORMAT" bytes.",
smartlist_len(routerlist->routers), U64_PRINTF_ARG(livedescs),
smartlist_len(routerlist->old_routers), U64_PRINTF_ARG(olddescs));
}
/** Debugging helper: If <b>idx</b> is nonnegative, assert that <b>ri</b> is
* in <b>sl</b> at position <b>idx</b>. Otherwise, search <b>sl</b> for
* <b>ri</b>. Return the index of <b>ri</b> in <b>sl</b>, or -1 if <b>ri</b>
* is not in <b>sl</b>. */
static inline int
routerlist_find_elt_(smartlist_t *sl, void *ri, int idx)
{
if (idx < 0) {
idx = -1;
SMARTLIST_FOREACH(sl, routerinfo_t *, r,
if (r == ri) {
idx = r_sl_idx;
break;
});
} else {
tor_assert(idx < smartlist_len(sl));
tor_assert(smartlist_get(sl, idx) == ri);
};
return idx;
}
/** Insert an item <b>ri</b> into the routerlist <b>rl</b>, updating indices
* as needed. There must be no previous member of <b>rl</b> with the same
* identity digest as <b>ri</b>: If there is, call routerlist_replace
* instead.
*/
static void
routerlist_insert(routerlist_t *rl, routerinfo_t *ri)
{
routerinfo_t *ri_old;
signed_descriptor_t *sd_old;
{
const routerinfo_t *ri_generated = router_get_my_routerinfo();
tor_assert(ri_generated != ri);
}
tor_assert(ri->cache_info.routerlist_index == -1);
ri_old = rimap_set(rl->identity_map, ri->cache_info.identity_digest, ri);
tor_assert(!ri_old);
sd_old = sdmap_set(rl->desc_digest_map,
ri->cache_info.signed_descriptor_digest,
&(ri->cache_info));
if (sd_old) {
int idx = sd_old->routerlist_index;
sd_old->routerlist_index = -1;
smartlist_del(rl->old_routers, idx);
if (idx < smartlist_len(rl->old_routers)) {
signed_descriptor_t *d = smartlist_get(rl->old_routers, idx);
d->routerlist_index = idx;
}
rl->desc_store.bytes_dropped += sd_old->signed_descriptor_len;
sdmap_remove(rl->desc_by_eid_map, sd_old->extra_info_digest);
signed_descriptor_free(sd_old);
}
if (!tor_digest_is_zero(ri->cache_info.extra_info_digest))
sdmap_set(rl->desc_by_eid_map, ri->cache_info.extra_info_digest,
&ri->cache_info);
smartlist_add(rl->routers, ri);
ri->cache_info.routerlist_index = smartlist_len(rl->routers) - 1;
nodelist_set_routerinfo(ri, NULL);
router_dir_info_changed();
#ifdef DEBUG_ROUTERLIST
routerlist_assert_ok(rl);
#endif
}
/** Adds the extrainfo_t <b>ei</b> to the routerlist <b>rl</b>, if there is a
* corresponding router in rl-\>routers or rl-\>old_routers. Return the status
* of inserting <b>ei</b>. Free <b>ei</b> if it isn't inserted. */
MOCK_IMPL(STATIC was_router_added_t,
extrainfo_insert,(routerlist_t *rl, extrainfo_t *ei, int warn_if_incompatible))
{
was_router_added_t r;
const char *compatibility_error_msg;
routerinfo_t *ri = rimap_get(rl->identity_map,
ei->cache_info.identity_digest);
signed_descriptor_t *sd =
sdmap_get(rl->desc_by_eid_map, ei->cache_info.signed_descriptor_digest);
extrainfo_t *ei_tmp;
const int severity = warn_if_incompatible ? LOG_WARN : LOG_INFO;
{
extrainfo_t *ei_generated = router_get_my_extrainfo();
tor_assert(ei_generated != ei);
}
if (!ri) {
/* This router is unknown; we can't even verify the signature. Give up.*/
r = ROUTER_NOT_IN_CONSENSUS;
goto done;
}
if (! sd) {
/* The extrainfo router doesn't have a known routerdesc to attach it to.
* This just won't work. */;
static ratelim_t no_sd_ratelim = RATELIM_INIT(1800);
r = ROUTER_BAD_EI;
log_fn_ratelim(&no_sd_ratelim, severity, LD_BUG,
"No entry found in extrainfo map.");
goto done;
}
if (tor_memneq(ei->cache_info.signed_descriptor_digest,
sd->extra_info_digest, DIGEST_LEN)) {
static ratelim_t digest_mismatch_ratelim = RATELIM_INIT(1800);
/* The sd we got from the map doesn't match the digest we used to look
* it up. This makes no sense. */
r = ROUTER_BAD_EI;
log_fn_ratelim(&digest_mismatch_ratelim, severity, LD_BUG,
"Mismatch in digest in extrainfo map.");
goto done;
}
if (routerinfo_incompatible_with_extrainfo(ri->identity_pkey, ei, sd,
&compatibility_error_msg)) {
char d1[HEX_DIGEST_LEN+1], d2[HEX_DIGEST_LEN+1];
r = (ri->cache_info.extrainfo_is_bogus) ?
ROUTER_BAD_EI : ROUTER_NOT_IN_CONSENSUS;
base16_encode(d1, sizeof(d1), ri->cache_info.identity_digest, DIGEST_LEN);
base16_encode(d2, sizeof(d2), ei->cache_info.identity_digest, DIGEST_LEN);
log_fn(severity,LD_DIR,
"router info incompatible with extra info (ri id: %s, ei id %s, "
"reason: %s)", d1, d2, compatibility_error_msg);
goto done;
}
/* Okay, if we make it here, we definitely have a router corresponding to
* this extrainfo. */
ei_tmp = eimap_set(rl->extra_info_map,
ei->cache_info.signed_descriptor_digest,
ei);
r = ROUTER_ADDED_SUCCESSFULLY;
if (ei_tmp) {
rl->extrainfo_store.bytes_dropped +=
ei_tmp->cache_info.signed_descriptor_len;
extrainfo_free(ei_tmp);
}
done:
if (r != ROUTER_ADDED_SUCCESSFULLY)
extrainfo_free(ei);
#ifdef DEBUG_ROUTERLIST
routerlist_assert_ok(rl);
#endif
return r;
}
#define should_cache_old_descriptors() \
directory_caches_dir_info(get_options())
/** If we're a directory cache and routerlist <b>rl</b> doesn't have
* a copy of router <b>ri</b> yet, add it to the list of old (not
* recommended but still served) descriptors. Else free it. */
static void
routerlist_insert_old(routerlist_t *rl, routerinfo_t *ri)
{
{
const routerinfo_t *ri_generated = router_get_my_routerinfo();
tor_assert(ri_generated != ri);
}
tor_assert(ri->cache_info.routerlist_index == -1);
if (should_cache_old_descriptors() &&
ri->purpose == ROUTER_PURPOSE_GENERAL &&
!sdmap_get(rl->desc_digest_map,
ri->cache_info.signed_descriptor_digest)) {
signed_descriptor_t *sd = signed_descriptor_from_routerinfo(ri);
sdmap_set(rl->desc_digest_map, sd->signed_descriptor_digest, sd);
smartlist_add(rl->old_routers, sd);
sd->routerlist_index = smartlist_len(rl->old_routers)-1;
if (!tor_digest_is_zero(sd->extra_info_digest))
sdmap_set(rl->desc_by_eid_map, sd->extra_info_digest, sd);
} else {
routerinfo_free(ri);
}
#ifdef DEBUG_ROUTERLIST
routerlist_assert_ok(rl);
#endif
}
/** Remove an item <b>ri</b> from the routerlist <b>rl</b>, updating indices
* as needed. If <b>idx</b> is nonnegative and smartlist_get(rl-&gt;routers,
* idx) == ri, we don't need to do a linear search over the list to decide
* which to remove. We fill the gap in rl-&gt;routers with a later element in
* the list, if any exists. <b>ri</b> is freed.
*
* If <b>make_old</b> is true, instead of deleting the router, we try adding
* it to rl-&gt;old_routers. */
void
routerlist_remove(routerlist_t *rl, routerinfo_t *ri, int make_old, time_t now)
{
routerinfo_t *ri_tmp;
extrainfo_t *ei_tmp;
int idx = ri->cache_info.routerlist_index;
tor_assert(0 <= idx && idx < smartlist_len(rl->routers));
tor_assert(smartlist_get(rl->routers, idx) == ri);
nodelist_remove_routerinfo(ri);
/* make sure the rephist module knows that it's not running */
rep_hist_note_router_unreachable(ri->cache_info.identity_digest, now);
ri->cache_info.routerlist_index = -1;
smartlist_del(rl->routers, idx);
if (idx < smartlist_len(rl->routers)) {
routerinfo_t *r = smartlist_get(rl->routers, idx);
r->cache_info.routerlist_index = idx;
}
ri_tmp = rimap_remove(rl->identity_map, ri->cache_info.identity_digest);
router_dir_info_changed();
tor_assert(ri_tmp == ri);
if (make_old && should_cache_old_descriptors() &&
ri->purpose == ROUTER_PURPOSE_GENERAL) {
signed_descriptor_t *sd;
sd = signed_descriptor_from_routerinfo(ri);
smartlist_add(rl->old_routers, sd);
sd->routerlist_index = smartlist_len(rl->old_routers)-1;
sdmap_set(rl->desc_digest_map, sd->signed_descriptor_digest, sd);
if (!tor_digest_is_zero(sd->extra_info_digest))
sdmap_set(rl->desc_by_eid_map, sd->extra_info_digest, sd);
} else {
signed_descriptor_t *sd_tmp;
sd_tmp = sdmap_remove(rl->desc_digest_map,
ri->cache_info.signed_descriptor_digest);
tor_assert(sd_tmp == &(ri->cache_info));
rl->desc_store.bytes_dropped += ri->cache_info.signed_descriptor_len;
ei_tmp = eimap_remove(rl->extra_info_map,
ri->cache_info.extra_info_digest);
if (ei_tmp) {
rl->extrainfo_store.bytes_dropped +=
ei_tmp->cache_info.signed_descriptor_len;
extrainfo_free(ei_tmp);
}
if (!tor_digest_is_zero(ri->cache_info.extra_info_digest))
sdmap_remove(rl->desc_by_eid_map, ri->cache_info.extra_info_digest);
routerinfo_free(ri);
}
#ifdef DEBUG_ROUTERLIST
routerlist_assert_ok(rl);
#endif
}
/** Remove a signed_descriptor_t <b>sd</b> from <b>rl</b>-\>old_routers, and
* adjust <b>rl</b> as appropriate. <b>idx</b> is -1, or the index of
* <b>sd</b>. */
static void
routerlist_remove_old(routerlist_t *rl, signed_descriptor_t *sd, int idx)
{
signed_descriptor_t *sd_tmp;
extrainfo_t *ei_tmp;
desc_store_t *store;
if (idx == -1) {
idx = sd->routerlist_index;
}
tor_assert(0 <= idx && idx < smartlist_len(rl->old_routers));
/* XXXX edmanm's bridge relay triggered the following assert while
* running 0.2.0.12-alpha. If anybody triggers this again, see if we
* can get a backtrace. */
tor_assert(smartlist_get(rl->old_routers, idx) == sd);
tor_assert(idx == sd->routerlist_index);
sd->routerlist_index = -1;
smartlist_del(rl->old_routers, idx);
if (idx < smartlist_len(rl->old_routers)) {
signed_descriptor_t *d = smartlist_get(rl->old_routers, idx);
d->routerlist_index = idx;
}
sd_tmp = sdmap_remove(rl->desc_digest_map,
sd->signed_descriptor_digest);
tor_assert(sd_tmp == sd);
store = desc_get_store(rl, sd);
if (store)
store->bytes_dropped += sd->signed_descriptor_len;
ei_tmp = eimap_remove(rl->extra_info_map,
sd->extra_info_digest);
if (ei_tmp) {
rl->extrainfo_store.bytes_dropped +=
ei_tmp->cache_info.signed_descriptor_len;
extrainfo_free(ei_tmp);
}
if (!tor_digest_is_zero(sd->extra_info_digest))
sdmap_remove(rl->desc_by_eid_map, sd->extra_info_digest);
signed_descriptor_free(sd);
#ifdef DEBUG_ROUTERLIST
routerlist_assert_ok(rl);
#endif
}
/** Remove <b>ri_old</b> from the routerlist <b>rl</b>, and replace it with
* <b>ri_new</b>, updating all index info. If <b>idx</b> is nonnegative and
* smartlist_get(rl-&gt;routers, idx) == ri, we don't need to do a linear
* search over the list to decide which to remove. We put ri_new in the same
* index as ri_old, if possible. ri is freed as appropriate.
*
* If should_cache_descriptors() is true, instead of deleting the router,
* we add it to rl-&gt;old_routers. */
static void
routerlist_replace(routerlist_t *rl, routerinfo_t *ri_old,
routerinfo_t *ri_new)
{
int idx;
int same_descriptors;
routerinfo_t *ri_tmp;
extrainfo_t *ei_tmp;
{
const routerinfo_t *ri_generated = router_get_my_routerinfo();
tor_assert(ri_generated != ri_new);
}
tor_assert(ri_old != ri_new);
tor_assert(ri_new->cache_info.routerlist_index == -1);
idx = ri_old->cache_info.routerlist_index;
tor_assert(0 <= idx && idx < smartlist_len(rl->routers));
tor_assert(smartlist_get(rl->routers, idx) == ri_old);
{
routerinfo_t *ri_old_tmp=NULL;
nodelist_set_routerinfo(ri_new, &ri_old_tmp);
tor_assert(ri_old == ri_old_tmp);
}
router_dir_info_changed();
if (idx >= 0) {
smartlist_set(rl->routers, idx, ri_new);
ri_old->cache_info.routerlist_index = -1;
ri_new->cache_info.routerlist_index = idx;
/* Check that ri_old is not in rl->routers anymore: */
tor_assert( routerlist_find_elt_(rl->routers, ri_old, -1) == -1 );
} else {
log_warn(LD_BUG, "Appending entry from routerlist_replace.");
routerlist_insert(rl, ri_new);
return;
}
if (tor_memneq(ri_old->cache_info.identity_digest,
ri_new->cache_info.identity_digest, DIGEST_LEN)) {
/* digests don't match; digestmap_set won't replace */
rimap_remove(rl->identity_map, ri_old->cache_info.identity_digest);
}
ri_tmp = rimap_set(rl->identity_map,
ri_new->cache_info.identity_digest, ri_new);
tor_assert(!ri_tmp || ri_tmp == ri_old);
sdmap_set(rl->desc_digest_map,
ri_new->cache_info.signed_descriptor_digest,
&(ri_new->cache_info));
if (!tor_digest_is_zero(ri_new->cache_info.extra_info_digest)) {
sdmap_set(rl->desc_by_eid_map, ri_new->cache_info.extra_info_digest,
&ri_new->cache_info);
}
same_descriptors = tor_memeq(ri_old->cache_info.signed_descriptor_digest,
ri_new->cache_info.signed_descriptor_digest,
DIGEST_LEN);
if (should_cache_old_descriptors() &&
ri_old->purpose == ROUTER_PURPOSE_GENERAL &&
!same_descriptors) {
/* ri_old is going to become a signed_descriptor_t and go into
* old_routers */
signed_descriptor_t *sd = signed_descriptor_from_routerinfo(ri_old);
smartlist_add(rl->old_routers, sd);
sd->routerlist_index = smartlist_len(rl->old_routers)-1;
sdmap_set(rl->desc_digest_map, sd->signed_descriptor_digest, sd);
if (!tor_digest_is_zero(sd->extra_info_digest))
sdmap_set(rl->desc_by_eid_map, sd->extra_info_digest, sd);
} else {
/* We're dropping ri_old. */
if (!same_descriptors) {
/* digests don't match; The sdmap_set above didn't replace */
sdmap_remove(rl->desc_digest_map,
ri_old->cache_info.signed_descriptor_digest);
if (tor_memneq(ri_old->cache_info.extra_info_digest,
ri_new->cache_info.extra_info_digest, DIGEST_LEN)) {
ei_tmp = eimap_remove(rl->extra_info_map,
ri_old->cache_info.extra_info_digest);
if (ei_tmp) {
rl->extrainfo_store.bytes_dropped +=
ei_tmp->cache_info.signed_descriptor_len;
extrainfo_free(ei_tmp);
}
}
if (!tor_digest_is_zero(ri_old->cache_info.extra_info_digest)) {
sdmap_remove(rl->desc_by_eid_map,
ri_old->cache_info.extra_info_digest);
}
}
rl->desc_store.bytes_dropped += ri_old->cache_info.signed_descriptor_len;
routerinfo_free(ri_old);
}
#ifdef DEBUG_ROUTERLIST
routerlist_assert_ok(rl);
#endif
}
/** Extract the descriptor <b>sd</b> from old_routerlist, and re-parse
* it as a fresh routerinfo_t. */
static routerinfo_t *
routerlist_reparse_old(routerlist_t *rl, signed_descriptor_t *sd)
{
routerinfo_t *ri;
const char *body;
body = signed_descriptor_get_annotations(sd);
ri = router_parse_entry_from_string(body,
body+sd->signed_descriptor_len+sd->annotations_len,
0, 1, NULL, NULL);
if (!ri)
return NULL;
signed_descriptor_move(&ri->cache_info, sd);
routerlist_remove_old(rl, sd, -1);
return ri;
}
/** Free all memory held by the routerlist module.
* Note: Calling routerlist_free_all() should always be paired with
* a call to nodelist_free_all(). These should only be called during
* cleanup.
*/
void
routerlist_free_all(void)
{
routerlist_free(routerlist);
routerlist = NULL;
if (warned_nicknames) {
SMARTLIST_FOREACH(warned_nicknames, char *, cp, tor_free(cp));
smartlist_free(warned_nicknames);
warned_nicknames = NULL;
}
clear_dir_servers();
smartlist_free(trusted_dir_servers);
smartlist_free(fallback_dir_servers);
trusted_dir_servers = fallback_dir_servers = NULL;
if (trusted_dir_certs) {
digestmap_free(trusted_dir_certs, cert_list_free_void);
trusted_dir_certs = NULL;
}
}
/** Forget that we have issued any router-related warnings, so that we'll
* warn again if we see the same errors. */
void
routerlist_reset_warnings(void)
{
if (!warned_nicknames)
warned_nicknames = smartlist_new();
SMARTLIST_FOREACH(warned_nicknames, char *, cp, tor_free(cp));
smartlist_clear(warned_nicknames); /* now the list is empty. */
networkstatus_reset_warnings();
}
/** Return 1 if the signed descriptor of this router is older than
* <b>seconds</b> seconds. Otherwise return 0. */
MOCK_IMPL(int,
router_descriptor_is_older_than,(const routerinfo_t *router, int seconds))
{
return router->cache_info.published_on < approx_time() - seconds;
}
/** Add <b>router</b> to the routerlist, if we don't already have it. Replace
* older entries (if any) with the same key. Note: Callers should not hold
* their pointers to <b>router</b> if this function fails; <b>router</b>
* will either be inserted into the routerlist or freed. Similarly, even
* if this call succeeds, they should not hold their pointers to
* <b>router</b> after subsequent calls with other routerinfo's -- they
* might cause the original routerinfo to get freed.
*
* Returns the status for the operation. Might set *<b>msg</b> if it wants
* the poster of the router to know something.
*
* If <b>from_cache</b>, this descriptor came from our disk cache. If
* <b>from_fetch</b>, we received it in response to a request we made.
* (If both are false, that means it was uploaded to us as an auth dir
* server or via the controller.)
*
* This function should be called *after*
* routers_update_status_from_consensus_networkstatus; subsequently, you
* should call router_rebuild_store and routerlist_descriptors_added.
*/
was_router_added_t
router_add_to_routerlist(routerinfo_t *router, const char **msg,
int from_cache, int from_fetch)
{
const char *id_digest;
const or_options_t *options = get_options();
int authdir = authdir_mode_handles_descs(options, router->purpose);
int authdir_believes_valid = 0;
routerinfo_t *old_router;
networkstatus_t *consensus =
networkstatus_get_latest_consensus_by_flavor(FLAV_NS);
int in_consensus = 0;
tor_assert(msg);
if (!routerlist)
router_get_routerlist();
id_digest = router->cache_info.identity_digest;
old_router = router_get_mutable_by_digest(id_digest);
/* Make sure that it isn't expired. */
if (router->cert_expiration_time < approx_time()) {
routerinfo_free(router);
*msg = "Some certs on this router are expired.";
return ROUTER_CERTS_EXPIRED;
}
/* Make sure that we haven't already got this exact descriptor. */
if (sdmap_get(routerlist->desc_digest_map,
router->cache_info.signed_descriptor_digest)) {
/* If we have this descriptor already and the new descriptor is a bridge
* descriptor, replace it. If we had a bridge descriptor before and the
* new one is not a bridge descriptor, don't replace it. */
/* Only members of routerlist->identity_map can be bridges; we don't
* put bridges in old_routers. */
const int was_bridge = old_router &&
old_router->purpose == ROUTER_PURPOSE_BRIDGE;
if (routerinfo_is_a_configured_bridge(router) &&
router->purpose == ROUTER_PURPOSE_BRIDGE &&
!was_bridge) {
log_info(LD_DIR, "Replacing non-bridge descriptor with bridge "
"descriptor for router %s",
router_describe(router));
} else {
log_info(LD_DIR,
"Dropping descriptor that we already have for router %s",
router_describe(router));
*msg = "Router descriptor was not new.";
routerinfo_free(router);
return ROUTER_IS_ALREADY_KNOWN;
}
}
if (authdir) {
if (authdir_wants_to_reject_router(router, msg,
!from_cache && !from_fetch,
&authdir_believes_valid)) {
tor_assert(*msg);
routerinfo_free(router);
return ROUTER_AUTHDIR_REJECTS;
}
} else if (from_fetch) {
/* Only check the descriptor digest against the network statuses when
* we are receiving in response to a fetch. */
if (!signed_desc_digest_is_recognized(&router->cache_info) &&
!routerinfo_is_a_configured_bridge(router)) {
/* We asked for it, so some networkstatus must have listed it when we
* did. Save it if we're a cache in case somebody else asks for it. */
log_info(LD_DIR,
"Received a no-longer-recognized descriptor for router %s",
router_describe(router));
*msg = "Router descriptor is not referenced by any network-status.";
/* Only journal this desc if we want to keep old descriptors */
if (!from_cache && should_cache_old_descriptors())
signed_desc_append_to_journal(&router->cache_info,
&routerlist->desc_store);
routerlist_insert_old(routerlist, router);
return ROUTER_NOT_IN_CONSENSUS_OR_NETWORKSTATUS;
}
}
/* We no longer need a router with this descriptor digest. */
if (consensus) {
routerstatus_t *rs = networkstatus_vote_find_mutable_entry(
consensus, id_digest);
if (rs && tor_memeq(rs->descriptor_digest,
router->cache_info.signed_descriptor_digest,
DIGEST_LEN)) {
in_consensus = 1;
}
}
if (router->purpose == ROUTER_PURPOSE_GENERAL &&
consensus && !in_consensus && !authdir) {
/* If it's a general router not listed in the consensus, then don't
* consider replacing the latest router with it. */
if (!from_cache && should_cache_old_descriptors())
signed_desc_append_to_journal(&router->cache_info,
&routerlist->desc_store);
routerlist_insert_old(routerlist, router);
*msg = "Skipping router descriptor: not in consensus.";
return ROUTER_NOT_IN_CONSENSUS;
}
/* If we're reading a bridge descriptor from our cache, and we don't
* recognize it as one of our currently configured bridges, drop the
* descriptor. Otherwise we could end up using it as one of our entry
* guards even if it isn't in our Bridge config lines. */
if (router->purpose == ROUTER_PURPOSE_BRIDGE && from_cache &&
!authdir_mode_bridge(options) &&
!routerinfo_is_a_configured_bridge(router)) {
log_info(LD_DIR, "Dropping bridge descriptor for %s because we have "
"no bridge configured at that address.",
safe_str_client(router_describe(router)));
*msg = "Router descriptor was not a configured bridge.";
routerinfo_free(router);
return ROUTER_WAS_NOT_WANTED;
}
/* If we have a router with the same identity key, choose the newer one. */
if (old_router) {
if (!in_consensus && (router->cache_info.published_on <=
old_router->cache_info.published_on)) {
/* Same key, but old. This one is not listed in the consensus. */
log_debug(LD_DIR, "Not-new descriptor for router %s",
router_describe(router));
/* Only journal this desc if we'll be serving it. */
if (!from_cache && should_cache_old_descriptors())
signed_desc_append_to_journal(&router->cache_info,
&routerlist->desc_store);
routerlist_insert_old(routerlist, router);
*msg = "Router descriptor was not new.";
return ROUTER_IS_ALREADY_KNOWN;
} else {
/* Same key, and either new, or listed in the consensus. */
log_debug(LD_DIR, "Replacing entry for router %s",
router_describe(router));
routerlist_replace(routerlist, old_router, router);
if (!from_cache) {
signed_desc_append_to_journal(&router->cache_info,
&routerlist->desc_store);
}
*msg = authdir_believes_valid ? "Valid server updated" :
("Invalid server updated. (This dirserver is marking your "
"server as unapproved.)");
return ROUTER_ADDED_SUCCESSFULLY;
}
}
if (!in_consensus && from_cache &&
router_descriptor_is_older_than(router, OLD_ROUTER_DESC_MAX_AGE)) {
*msg = "Router descriptor was really old.";
routerinfo_free(router);
return ROUTER_WAS_TOO_OLD;
}
/* We haven't seen a router with this identity before. Add it to the end of
* the list. */
routerlist_insert(routerlist, router);
if (!from_cache) {
signed_desc_append_to_journal(&router->cache_info,
&routerlist->desc_store);
}
return ROUTER_ADDED_SUCCESSFULLY;
}
/** Insert <b>ei</b> into the routerlist, or free it. Other arguments are
* as for router_add_to_routerlist(). Return ROUTER_ADDED_SUCCESSFULLY iff
* we actually inserted it, ROUTER_BAD_EI otherwise.
*/
was_router_added_t
router_add_extrainfo_to_routerlist(extrainfo_t *ei, const char **msg,
int from_cache, int from_fetch)
{
was_router_added_t inserted;
(void)from_fetch;
if (msg) *msg = NULL;
/*XXXX Do something with msg */
inserted = extrainfo_insert(router_get_routerlist(), ei, !from_cache);
if (WRA_WAS_ADDED(inserted) && !from_cache)
signed_desc_append_to_journal(&ei->cache_info,
&routerlist->extrainfo_store);
return inserted;
}
/** Sorting helper: return &lt;0, 0, or &gt;0 depending on whether the
* signed_descriptor_t* in *<b>a</b> has an identity digest preceding, equal
* to, or later than that of *<b>b</b>. */
static int
compare_old_routers_by_identity_(const void **_a, const void **_b)
{
int i;
const signed_descriptor_t *r1 = *_a, *r2 = *_b;
if ((i = fast_memcmp(r1->identity_digest, r2->identity_digest, DIGEST_LEN)))
return i;
return (int)(r1->published_on - r2->published_on);
}
/** Internal type used to represent how long an old descriptor was valid,
* where it appeared in the list of old descriptors, and whether it's extra
* old. Used only by routerlist_remove_old_cached_routers_with_id(). */
struct duration_idx_t {
int duration;
int idx;
int old;
};
/** Sorting helper: compare two duration_idx_t by their duration. */
static int
compare_duration_idx_(const void *_d1, const void *_d2)
{
const struct duration_idx_t *d1 = _d1;
const struct duration_idx_t *d2 = _d2;
return d1->duration - d2->duration;
}
/** The range <b>lo</b> through <b>hi</b> inclusive of routerlist->old_routers
* must contain routerinfo_t with the same identity and with publication time
* in ascending order. Remove members from this range until there are no more
* than max_descriptors_per_router() remaining. Start by removing the oldest
* members from before <b>cutoff</b>, then remove members which were current
* for the lowest amount of time. The order of members of old_routers at
* indices <b>lo</b> or higher may be changed.
*/
static void
routerlist_remove_old_cached_routers_with_id(time_t now,
time_t cutoff, int lo, int hi,
digestset_t *retain)
{
int i, n = hi-lo+1;
unsigned n_extra, n_rmv = 0;
struct duration_idx_t *lifespans;
uint8_t *rmv, *must_keep;
smartlist_t *lst = routerlist->old_routers;
#if 1
const char *ident;
tor_assert(hi < smartlist_len(lst));
tor_assert(lo <= hi);
ident = ((signed_descriptor_t*)smartlist_get(lst, lo))->identity_digest;
for (i = lo+1; i <= hi; ++i) {
signed_descriptor_t *r = smartlist_get(lst, i);
tor_assert(tor_memeq(ident, r->identity_digest, DIGEST_LEN));
}
#endif /* 1 */
/* Check whether we need to do anything at all. */
{
int mdpr = directory_caches_dir_info(get_options()) ? 2 : 1;
if (n <= mdpr)
return;
n_extra = n - mdpr;
}
lifespans = tor_calloc(n, sizeof(struct duration_idx_t));
rmv = tor_calloc(n, sizeof(uint8_t));
must_keep = tor_calloc(n, sizeof(uint8_t));
/* Set lifespans to contain the lifespan and index of each server. */
/* Set rmv[i-lo]=1 if we're going to remove a server for being too old. */
for (i = lo; i <= hi; ++i) {
signed_descriptor_t *r = smartlist_get(lst, i);
signed_descriptor_t *r_next;
lifespans[i-lo].idx = i;
if (r->last_listed_as_valid_until >= now ||
(retain && digestset_contains(retain, r->signed_descriptor_digest))) {
must_keep[i-lo] = 1;
}
if (i < hi) {
r_next = smartlist_get(lst, i+1);
tor_assert(r->published_on <= r_next->published_on);
lifespans[i-lo].duration = (int)(r_next->published_on - r->published_on);
} else {
r_next = NULL;
lifespans[i-lo].duration = INT_MAX;
}
if (!must_keep[i-lo] && r->published_on < cutoff && n_rmv < n_extra) {
++n_rmv;
lifespans[i-lo].old = 1;
rmv[i-lo] = 1;
}
}
if (n_rmv < n_extra) {
/**
* We aren't removing enough servers for being old. Sort lifespans by
* the duration of liveness, and remove the ones we're not already going to
* remove based on how long they were alive.
**/
qsort(lifespans, n, sizeof(struct duration_idx_t), compare_duration_idx_);
for (i = 0; i < n && n_rmv < n_extra; ++i) {
if (!must_keep[lifespans[i].idx-lo] && !lifespans[i].old) {
rmv[lifespans[i].idx-lo] = 1;
++n_rmv;
}
}
}
i = hi;
do {
if (rmv[i-lo])
routerlist_remove_old(routerlist, smartlist_get(lst, i), i);
} while (--i >= lo);
tor_free(must_keep);
tor_free(rmv);
tor_free(lifespans);
}
/** Deactivate any routers from the routerlist that are more than
* ROUTER_MAX_AGE seconds old and not recommended by any networkstatuses;
* remove old routers from the list of cached routers if we have too many.
*/
void
routerlist_remove_old_routers(void)
{
int i, hi=-1;
const char *cur_id = NULL;
time_t now = time(NULL);
time_t cutoff;
routerinfo_t *router;
signed_descriptor_t *sd;
digestset_t *retain;
const networkstatus_t *consensus = networkstatus_get_latest_consensus();
trusted_dirs_remove_old_certs();
if (!routerlist || !consensus)
return;
// routerlist_assert_ok(routerlist);
/* We need to guess how many router descriptors we will wind up wanting to
retain, so that we can be sure to allocate a large enough Bloom filter
to hold the digest set. Overestimating is fine; underestimating is bad.
*/
{
/* We'll probably retain everything in the consensus. */
int n_max_retain = smartlist_len(consensus->routerstatus_list);
retain = digestset_new(n_max_retain);
}
cutoff = now - OLD_ROUTER_DESC_MAX_AGE;
/* Retain anything listed in the consensus. */
if (consensus) {
SMARTLIST_FOREACH(consensus->routerstatus_list, routerstatus_t *, rs,
if (rs->published_on >= cutoff)
digestset_add(retain, rs->descriptor_digest));
}
/* If we have a consensus, we should consider pruning current routers that
* are too old and that nobody recommends. (If we don't have a consensus,
* then we should get one before we decide to kill routers.) */
if (consensus) {
cutoff = now - ROUTER_MAX_AGE;
/* Remove too-old unrecommended members of routerlist->routers. */
for (i = 0; i < smartlist_len(routerlist->routers); ++i) {
router = smartlist_get(routerlist->routers, i);
if (router->cache_info.published_on <= cutoff &&
router->cache_info.last_listed_as_valid_until < now &&
!digestset_contains(retain,
router->cache_info.signed_descriptor_digest)) {
/* Too old: remove it. (If we're a cache, just move it into
* old_routers.) */
log_info(LD_DIR,
"Forgetting obsolete (too old) routerinfo for router %s",
router_describe(router));
routerlist_remove(routerlist, router, 1, now);
i--;
}
}
}
//routerlist_assert_ok(routerlist);
/* Remove far-too-old members of routerlist->old_routers. */
cutoff = now - OLD_ROUTER_DESC_MAX_AGE;
for (i = 0; i < smartlist_len(routerlist->old_routers); ++i) {
sd = smartlist_get(routerlist->old_routers, i);
if (sd->published_on <= cutoff &&
sd->last_listed_as_valid_until < now &&
!digestset_contains(retain, sd->signed_descriptor_digest)) {
/* Too old. Remove it. */
routerlist_remove_old(routerlist, sd, i--);
}
}
//routerlist_assert_ok(routerlist);
log_info(LD_DIR, "We have %d live routers and %d old router descriptors.",
smartlist_len(routerlist->routers),
smartlist_len(routerlist->old_routers));
/* Now we might have to look at routerlist->old_routers for extraneous
* members. (We'd keep all the members if we could, but we need to save
* space.) First, check whether we have too many router descriptors, total.
* We're okay with having too many for some given router, so long as the
* total number doesn't approach max_descriptors_per_router()*len(router).
*/
if (smartlist_len(routerlist->old_routers) <
smartlist_len(routerlist->routers))
goto done;
/* Sort by identity, then fix indices. */
smartlist_sort(routerlist->old_routers, compare_old_routers_by_identity_);
/* Fix indices. */
for (i = 0; i < smartlist_len(routerlist->old_routers); ++i) {
signed_descriptor_t *r = smartlist_get(routerlist->old_routers, i);
r->routerlist_index = i;
}
/* Iterate through the list from back to front, so when we remove descriptors
* we don't mess up groups we haven't gotten to. */
for (i = smartlist_len(routerlist->old_routers)-1; i >= 0; --i) {
signed_descriptor_t *r = smartlist_get(routerlist->old_routers, i);
if (!cur_id) {
cur_id = r->identity_digest;
hi = i;
}
if (tor_memneq(cur_id, r->identity_digest, DIGEST_LEN)) {
routerlist_remove_old_cached_routers_with_id(now,
cutoff, i+1, hi, retain);
cur_id = r->identity_digest;
hi = i;
}
}
if (hi>=0)
routerlist_remove_old_cached_routers_with_id(now, cutoff, 0, hi, retain);
//routerlist_assert_ok(routerlist);
done:
digestset_free(retain);
router_rebuild_store(RRS_DONT_REMOVE_OLD, &routerlist->desc_store);
router_rebuild_store(RRS_DONT_REMOVE_OLD,&routerlist->extrainfo_store);
}
/** We just added a new set of descriptors. Take whatever extra steps
* we need. */
void
routerlist_descriptors_added(smartlist_t *sl, int from_cache)
{
tor_assert(sl);
control_event_descriptors_changed(sl);
SMARTLIST_FOREACH_BEGIN(sl, routerinfo_t *, ri) {
if (ri->purpose == ROUTER_PURPOSE_BRIDGE)
learned_bridge_descriptor(ri, from_cache);
if (ri->needs_retest_if_added) {
ri->needs_retest_if_added = 0;
dirserv_single_reachability_test(approx_time(), ri);
}
} SMARTLIST_FOREACH_END(ri);
}
/**
* Code to parse a single router descriptor and insert it into the
* routerlist. Return -1 if the descriptor was ill-formed; 0 if the
* descriptor was well-formed but could not be added; and 1 if the
* descriptor was added.
*
* If we don't add it and <b>msg</b> is not NULL, then assign to
* *<b>msg</b> a static string describing the reason for refusing the
* descriptor.
*
* This is used only by the controller.
*/
int
router_load_single_router(const char *s, uint8_t purpose, int cache,
const char **msg)
{
routerinfo_t *ri;
was_router_added_t r;
smartlist_t *lst;
char annotation_buf[ROUTER_ANNOTATION_BUF_LEN];
tor_assert(msg);
*msg = NULL;
tor_snprintf(annotation_buf, sizeof(annotation_buf),
"@source controller\n"
"@purpose %s\n", router_purpose_to_string(purpose));
if (!(ri = router_parse_entry_from_string(s, NULL, 1, 0,
annotation_buf, NULL))) {
log_warn(LD_DIR, "Error parsing router descriptor; dropping.");
*msg = "Couldn't parse router descriptor.";
return -1;
}
tor_assert(ri->purpose == purpose);
if (router_is_me(ri)) {
log_warn(LD_DIR, "Router's identity key matches mine; dropping.");
*msg = "Router's identity key matches mine.";
routerinfo_free(ri);
return 0;
}
if (!cache) /* obey the preference of the controller */
ri->cache_info.do_not_cache = 1;
lst = smartlist_new();
smartlist_add(lst, ri);
routers_update_status_from_consensus_networkstatus(lst, 0);
r = router_add_to_routerlist(ri, msg, 0, 0);
if (!WRA_WAS_ADDED(r)) {
/* we've already assigned to *msg now, and ri is already freed */
tor_assert(*msg);
if (r == ROUTER_AUTHDIR_REJECTS)
log_warn(LD_DIR, "Couldn't add router to list: %s Dropping.", *msg);
smartlist_free(lst);
return 0;
} else {
routerlist_descriptors_added(lst, 0);
smartlist_free(lst);
log_debug(LD_DIR, "Added router to list");
return 1;
}
}
/** Given a string <b>s</b> containing some routerdescs, parse it and put the
* routers into our directory. If saved_location is SAVED_NOWHERE, the routers
* are in response to a query to the network: cache them by adding them to
* the journal.
*
* Return the number of routers actually added.
*
* If <b>requested_fingerprints</b> is provided, it must contain a list of
* uppercased fingerprints. Do not update any router whose
* fingerprint is not on the list; after updating a router, remove its
* fingerprint from the list.
*
* If <b>descriptor_digests</b> is non-zero, then the requested_fingerprints
* are descriptor digests. Otherwise they are identity digests.
*/
int
router_load_routers_from_string(const char *s, const char *eos,
saved_location_t saved_location,
smartlist_t *requested_fingerprints,
int descriptor_digests,
const char *prepend_annotations)
{
smartlist_t *routers = smartlist_new(), *changed = smartlist_new();
char fp[HEX_DIGEST_LEN+1];
const char *msg;
int from_cache = (saved_location != SAVED_NOWHERE);
int allow_annotations = (saved_location != SAVED_NOWHERE);
int any_changed = 0;
smartlist_t *invalid_digests = smartlist_new();
router_parse_list_from_string(&s, eos, routers, saved_location, 0,
allow_annotations, prepend_annotations,
invalid_digests);
routers_update_status_from_consensus_networkstatus(routers, !from_cache);
log_info(LD_DIR, "%d elements to add", smartlist_len(routers));
SMARTLIST_FOREACH_BEGIN(routers, routerinfo_t *, ri) {
was_router_added_t r;
char d[DIGEST_LEN];
if (requested_fingerprints) {
base16_encode(fp, sizeof(fp), descriptor_digests ?
ri->cache_info.signed_descriptor_digest :
ri->cache_info.identity_digest,
DIGEST_LEN);
if (smartlist_contains_string(requested_fingerprints, fp)) {
smartlist_string_remove(requested_fingerprints, fp);
} else {
char *requested =
smartlist_join_strings(requested_fingerprints," ",0,NULL);
log_warn(LD_DIR,
"We received a router descriptor with a fingerprint (%s) "
"that we never requested. (We asked for: %s.) Dropping.",
fp, requested);
tor_free(requested);
routerinfo_free(ri);
continue;
}
}
memcpy(d, ri->cache_info.signed_descriptor_digest, DIGEST_LEN);
r = router_add_to_routerlist(ri, &msg, from_cache, !from_cache);
if (WRA_WAS_ADDED(r)) {
any_changed++;
smartlist_add(changed, ri);
routerlist_descriptors_added(changed, from_cache);
smartlist_clear(changed);
} else if (WRA_NEVER_DOWNLOADABLE(r)) {
download_status_t *dl_status;
dl_status = router_get_dl_status_by_descriptor_digest(d);
if (dl_status) {
log_info(LD_GENERAL, "Marking router %s as never downloadable",
hex_str(d, DIGEST_LEN));
download_status_mark_impossible(dl_status);
}
}
} SMARTLIST_FOREACH_END(ri);
SMARTLIST_FOREACH_BEGIN(invalid_digests, const uint8_t *, bad_digest) {
/* This digest is never going to be parseable. */
base16_encode(fp, sizeof(fp), (char*)bad_digest, DIGEST_LEN);
if (requested_fingerprints && descriptor_digests) {
if (! smartlist_contains_string(requested_fingerprints, fp)) {
/* But we didn't ask for it, so we should assume shennanegans. */
continue;
}
smartlist_string_remove(requested_fingerprints, fp);
}
download_status_t *dls;
dls = router_get_dl_status_by_descriptor_digest((char*)bad_digest);
if (dls) {
log_info(LD_GENERAL, "Marking router with descriptor %s as unparseable, "
"and therefore undownloadable", fp);
download_status_mark_impossible(dls);
}
} SMARTLIST_FOREACH_END(bad_digest);
SMARTLIST_FOREACH(invalid_digests, uint8_t *, d, tor_free(d));
smartlist_free(invalid_digests);
routerlist_assert_ok(routerlist);
if (any_changed)
router_rebuild_store(0, &routerlist->desc_store);
smartlist_free(routers);
smartlist_free(changed);
return any_changed;
}
/** Parse one or more extrainfos from <b>s</b> (ending immediately before
* <b>eos</b> if <b>eos</b> is present). Other arguments are as for
* router_load_routers_from_string(). */
void
router_load_extrainfo_from_string(const char *s, const char *eos,
saved_location_t saved_location,
smartlist_t *requested_fingerprints,
int descriptor_digests)
{
smartlist_t *extrainfo_list = smartlist_new();
const char *msg;
int from_cache = (saved_location != SAVED_NOWHERE);
smartlist_t *invalid_digests = smartlist_new();
router_parse_list_from_string(&s, eos, extrainfo_list, saved_location, 1, 0,
NULL, invalid_digests);
log_info(LD_DIR, "%d elements to add", smartlist_len(extrainfo_list));
SMARTLIST_FOREACH_BEGIN(extrainfo_list, extrainfo_t *, ei) {
uint8_t d[DIGEST_LEN];
memcpy(d, ei->cache_info.signed_descriptor_digest, DIGEST_LEN);
was_router_added_t added =
router_add_extrainfo_to_routerlist(ei, &msg, from_cache, !from_cache);
if (WRA_WAS_ADDED(added) && requested_fingerprints) {
char fp[HEX_DIGEST_LEN+1];
base16_encode(fp, sizeof(fp), descriptor_digests ?
ei->cache_info.signed_descriptor_digest :
ei->cache_info.identity_digest,
DIGEST_LEN);
smartlist_string_remove(requested_fingerprints, fp);
/* We silently let relays stuff us with extrainfos we didn't ask for,
* so long as we would have wanted them anyway. Since we always fetch
* all the extrainfos we want, and we never actually act on them
* inside Tor, this should be harmless. */
} else if (WRA_NEVER_DOWNLOADABLE(added)) {
signed_descriptor_t *sd = router_get_by_extrainfo_digest((char*)d);
if (sd) {
log_info(LD_GENERAL, "Marking extrainfo with descriptor %s as "
"unparseable, and therefore undownloadable",
hex_str((char*)d,DIGEST_LEN));
download_status_mark_impossible(&sd->ei_dl_status);
}
}
} SMARTLIST_FOREACH_END(ei);
SMARTLIST_FOREACH_BEGIN(invalid_digests, const uint8_t *, bad_digest) {
/* This digest is never going to be parseable. */
char fp[HEX_DIGEST_LEN+1];
base16_encode(fp, sizeof(fp), (char*)bad_digest, DIGEST_LEN);
if (requested_fingerprints) {
if (! smartlist_contains_string(requested_fingerprints, fp)) {
/* But we didn't ask for it, so we should assume shennanegans. */
continue;
}
smartlist_string_remove(requested_fingerprints, fp);
}
signed_descriptor_t *sd =
router_get_by_extrainfo_digest((char*)bad_digest);
if (sd) {
log_info(LD_GENERAL, "Marking extrainfo with descriptor %s as "
"unparseable, and therefore undownloadable", fp);
download_status_mark_impossible(&sd->ei_dl_status);
}
} SMARTLIST_FOREACH_END(bad_digest);
SMARTLIST_FOREACH(invalid_digests, uint8_t *, d, tor_free(d));
smartlist_free(invalid_digests);
routerlist_assert_ok(routerlist);
router_rebuild_store(0, &router_get_routerlist()->extrainfo_store);
smartlist_free(extrainfo_list);
}
/** Return true iff the latest ns-flavored consensus includes a descriptor
* whose digest is that of <b>desc</b>. */
static int
signed_desc_digest_is_recognized(signed_descriptor_t *desc)
{
const routerstatus_t *rs;
networkstatus_t *consensus = networkstatus_get_latest_consensus_by_flavor(
FLAV_NS);
if (consensus) {
rs = networkstatus_vote_find_entry(consensus, desc->identity_digest);
if (rs && tor_memeq(rs->descriptor_digest,
desc->signed_descriptor_digest, DIGEST_LEN))
return 1;
}
return 0;
}
/** Update downloads for router descriptors and/or microdescriptors as
* appropriate. */
void
update_all_descriptor_downloads(time_t now)
{
if (should_delay_dir_fetches(get_options(), NULL))
return;
update_router_descriptor_downloads(now);
update_microdesc_downloads(now);
launch_dummy_descriptor_download_as_needed(now, get_options());
}
/** Clear all our timeouts for fetching v3 directory stuff, and then
* give it all a try again. */
void
routerlist_retry_directory_downloads(time_t now)
{
(void)now;
log_debug(LD_GENERAL,
"In routerlist_retry_directory_downloads()");
router_reset_status_download_failures();
router_reset_descriptor_download_failures();
reschedule_directory_downloads();
}
/** Return true iff <b>router</b> does not permit exit streams.
*/
int
router_exit_policy_rejects_all(const routerinfo_t *router)
{
return router->policy_is_reject_star;
}
/** Create a directory server at <b>address</b>:<b>port</b>, with OR identity
* key <b>digest</b> which has DIGEST_LEN bytes. If <b>address</b> is NULL,
* add ourself. If <b>is_authority</b>, this is a directory authority. Return
* the new directory server entry on success or NULL on failure. */
static dir_server_t *
dir_server_new(int is_authority,
const char *nickname,
const tor_addr_t *addr,
const char *hostname,
uint16_t dir_port, uint16_t or_port,
const tor_addr_port_t *addrport_ipv6,
const char *digest, const char *v3_auth_digest,
dirinfo_type_t type,
double weight)
{
dir_server_t *ent;
uint32_t a;
char *hostname_ = NULL;
tor_assert(digest);
if (weight < 0)
return NULL;
if (tor_addr_family(addr) == AF_INET)
a = tor_addr_to_ipv4h(addr);
else
return NULL;
if (!hostname)
hostname_ = tor_addr_to_str_dup(addr);
else
hostname_ = tor_strdup(hostname);
ent = tor_malloc_zero(sizeof(dir_server_t));
ent->nickname = nickname ? tor_strdup(nickname) : NULL;
ent->address = hostname_;
ent->addr = a;
ent->dir_port = dir_port;
ent->or_port = or_port;
ent->is_running = 1;
ent->is_authority = is_authority;
ent->type = type;
ent->weight = weight;
if (addrport_ipv6) {
if (tor_addr_family(&addrport_ipv6->addr) != AF_INET6) {
log_warn(LD_BUG, "Hey, I got a non-ipv6 addr as addrport_ipv6.");
tor_addr_make_unspec(&ent->ipv6_addr);
} else {
tor_addr_copy(&ent->ipv6_addr, &addrport_ipv6->addr);
ent->ipv6_orport = addrport_ipv6->port;
}
} else {
tor_addr_make_unspec(&ent->ipv6_addr);
}
memcpy(ent->digest, digest, DIGEST_LEN);
if (v3_auth_digest && (type & V3_DIRINFO))
memcpy(ent->v3_identity_digest, v3_auth_digest, DIGEST_LEN);
if (nickname)
tor_asprintf(&ent->description, "directory server \"%s\" at %s:%d",
nickname, hostname_, (int)dir_port);
else
tor_asprintf(&ent->description, "directory server at %s:%d",
hostname_, (int)dir_port);
ent->fake_status.addr = ent->addr;
tor_addr_copy(&ent->fake_status.ipv6_addr, &ent->ipv6_addr);
memcpy(ent->fake_status.identity_digest, digest, DIGEST_LEN);
if (nickname)
strlcpy(ent->fake_status.nickname, nickname,
sizeof(ent->fake_status.nickname));
else
ent->fake_status.nickname[0] = '\0';
ent->fake_status.dir_port = ent->dir_port;
ent->fake_status.or_port = ent->or_port;
ent->fake_status.ipv6_orport = ent->ipv6_orport;
return ent;
}
/** Create an authoritative directory server at
* <b>address</b>:<b>port</b>, with identity key <b>digest</b>. If
* <b>address</b> is NULL, add ourself. Return the new trusted directory
* server entry on success or NULL if we couldn't add it. */
dir_server_t *
trusted_dir_server_new(const char *nickname, const char *address,
uint16_t dir_port, uint16_t or_port,
const tor_addr_port_t *ipv6_addrport,
const char *digest, const char *v3_auth_digest,
dirinfo_type_t type, double weight)
{
uint32_t a;
tor_addr_t addr;
char *hostname=NULL;
dir_server_t *result;
if (!address) { /* The address is us; we should guess. */
if (resolve_my_address(LOG_WARN, get_options(),
&a, NULL, &hostname) < 0) {
log_warn(LD_CONFIG,
"Couldn't find a suitable address when adding ourself as a "
"trusted directory server.");
return NULL;
}
if (!hostname)
hostname = tor_dup_ip(a);
} else {
if (tor_lookup_hostname(address, &a)) {
log_warn(LD_CONFIG,
"Unable to lookup address for directory server at '%s'",
address);
return NULL;
}
hostname = tor_strdup(address);
}
tor_addr_from_ipv4h(&addr, a);
result = dir_server_new(1, nickname, &addr, hostname,
dir_port, or_port,
ipv6_addrport,
digest,
v3_auth_digest, type, weight);
tor_free(hostname);
return result;
}
/** Return a new dir_server_t for a fallback directory server at
* <b>addr</b>:<b>or_port</b>/<b>dir_port</b>, with identity key digest
* <b>id_digest</b> */
dir_server_t *
fallback_dir_server_new(const tor_addr_t *addr,
uint16_t dir_port, uint16_t or_port,
const tor_addr_port_t *addrport_ipv6,
const char *id_digest, double weight)
{
return dir_server_new(0, NULL, addr, NULL, dir_port, or_port,
addrport_ipv6,
id_digest,
NULL, ALL_DIRINFO, weight);
}
/** Add a directory server to the global list(s). */
void
dir_server_add(dir_server_t *ent)
{
if (!trusted_dir_servers)
trusted_dir_servers = smartlist_new();
if (!fallback_dir_servers)
fallback_dir_servers = smartlist_new();
if (ent->is_authority)
smartlist_add(trusted_dir_servers, ent);
smartlist_add(fallback_dir_servers, ent);
router_dir_info_changed();
}
/** Free storage held in <b>cert</b>. */
void
authority_cert_free_(authority_cert_t *cert)
{
if (!cert)
return;
tor_free(cert->cache_info.signed_descriptor_body);
crypto_pk_free(cert->signing_key);
crypto_pk_free(cert->identity_key);
tor_free(cert);
}
#define dir_server_free(val) \
FREE_AND_NULL(dir_server_t, dir_server_free_, (val))
/** Free storage held in <b>ds</b>. */
static void
dir_server_free_(dir_server_t *ds)
{
if (!ds)
return;
tor_free(ds->nickname);
tor_free(ds->description);
tor_free(ds->address);
tor_free(ds);
}
/** Remove all members from the list of dir servers. */
void
clear_dir_servers(void)
{
if (fallback_dir_servers) {
SMARTLIST_FOREACH(fallback_dir_servers, dir_server_t *, ent,
dir_server_free(ent));
smartlist_clear(fallback_dir_servers);
} else {
fallback_dir_servers = smartlist_new();
}
if (trusted_dir_servers) {
smartlist_clear(trusted_dir_servers);
} else {
trusted_dir_servers = smartlist_new();
}
router_dir_info_changed();
}
/** For every current directory connection whose purpose is <b>purpose</b>,
* and where the resource being downloaded begins with <b>prefix</b>, split
* rest of the resource into base16 fingerprints (or base64 fingerprints if
* purpose==DIR_PURPOSE_FETCH_MICRODESC), decode them, and set the
* corresponding elements of <b>result</b> to a nonzero value.
*/
static void
list_pending_downloads(digestmap_t *result, digest256map_t *result256,
int purpose, const char *prefix)
{
const size_t p_len = strlen(prefix);
smartlist_t *tmp = smartlist_new();
smartlist_t *conns = get_connection_array();
int flags = DSR_HEX;
if (purpose == DIR_PURPOSE_FETCH_MICRODESC)
flags = DSR_DIGEST256|DSR_BASE64;
tor_assert(result || result256);
SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
if (conn->type == CONN_TYPE_DIR &&
conn->purpose == purpose &&
!conn->marked_for_close) {
const char *resource = TO_DIR_CONN(conn)->requested_resource;
if (!strcmpstart(resource, prefix))
dir_split_resource_into_fingerprints(resource + p_len,
tmp, NULL, flags);
}
} SMARTLIST_FOREACH_END(conn);
if (result) {
SMARTLIST_FOREACH(tmp, char *, d,
{
digestmap_set(result, d, (void*)1);
tor_free(d);
});
} else if (result256) {
SMARTLIST_FOREACH(tmp, uint8_t *, d,
{
digest256map_set(result256, d, (void*)1);
tor_free(d);
});
}
smartlist_free(tmp);
}
/** For every router descriptor (or extra-info document if <b>extrainfo</b> is
* true) we are currently downloading by descriptor digest, set result[d] to
* (void*)1. */
static void
list_pending_descriptor_downloads(digestmap_t *result, int extrainfo)
{
int purpose =
extrainfo ? DIR_PURPOSE_FETCH_EXTRAINFO : DIR_PURPOSE_FETCH_SERVERDESC;
list_pending_downloads(result, NULL, purpose, "d/");
}
/** For every microdescriptor we are currently downloading by descriptor
* digest, set result[d] to (void*)1.
*/
void
list_pending_microdesc_downloads(digest256map_t *result)
{
list_pending_downloads(NULL, result, DIR_PURPOSE_FETCH_MICRODESC, "d/");
}
/** For every certificate we are currently downloading by (identity digest,
* signing key digest) pair, set result[fp_pair] to (void *1).
*/
static void
list_pending_fpsk_downloads(fp_pair_map_t *result)
{
const char *pfx = "fp-sk/";
smartlist_t *tmp;
smartlist_t *conns;
const char *resource;
tor_assert(result);
tmp = smartlist_new();
conns = get_connection_array();
SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
if (conn->type == CONN_TYPE_DIR &&
conn->purpose == DIR_PURPOSE_FETCH_CERTIFICATE &&
!conn->marked_for_close) {
resource = TO_DIR_CONN(conn)->requested_resource;
if (!strcmpstart(resource, pfx))
dir_split_resource_into_fingerprint_pairs(resource + strlen(pfx),
tmp);
}
} SMARTLIST_FOREACH_END(conn);
SMARTLIST_FOREACH_BEGIN(tmp, fp_pair_t *, fp) {
fp_pair_map_set(result, fp, (void*)1);
tor_free(fp);
} SMARTLIST_FOREACH_END(fp);
smartlist_free(tmp);
}
/** Launch downloads for all the descriptors whose digests or digests256
* are listed as digests[i] for lo <= i < hi. (Lo and hi may be out of
* range.) If <b>source</b> is given, download from <b>source</b>;
* otherwise, download from an appropriate random directory server.
*/
MOCK_IMPL(STATIC void,
initiate_descriptor_downloads,(const routerstatus_t *source,
int purpose, smartlist_t *digests,
int lo, int hi, int pds_flags))
{
char *resource, *cp;
int digest_len, enc_digest_len;
const char *sep;
int b64_256;
smartlist_t *tmp;
if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
/* Microdescriptors are downloaded by "-"-separated base64-encoded
* 256-bit digests. */
digest_len = DIGEST256_LEN;
enc_digest_len = BASE64_DIGEST256_LEN + 1;
sep = "-";
b64_256 = 1;
} else {
digest_len = DIGEST_LEN;
enc_digest_len = HEX_DIGEST_LEN + 1;
sep = "+";
b64_256 = 0;
}
if (lo < 0)
lo = 0;
if (hi > smartlist_len(digests))
hi = smartlist_len(digests);
if (hi-lo <= 0)
return;
tmp = smartlist_new();
for (; lo < hi; ++lo) {
cp = tor_malloc(enc_digest_len);
if (b64_256) {
digest256_to_base64(cp, smartlist_get(digests, lo));
} else {
base16_encode(cp, enc_digest_len, smartlist_get(digests, lo),
digest_len);
}
smartlist_add(tmp, cp);
}
cp = smartlist_join_strings(tmp, sep, 0, NULL);
tor_asprintf(&resource, "d/%s.z", cp);
SMARTLIST_FOREACH(tmp, char *, cp1, tor_free(cp1));
smartlist_free(tmp);
tor_free(cp);
if (source) {
/* We know which authority or directory mirror we want. */
directory_request_t *req = directory_request_new(purpose);
directory_request_set_routerstatus(req, source);
directory_request_set_resource(req, resource);
directory_initiate_request(req);
directory_request_free(req);
} else {
directory_get_from_dirserver(purpose, ROUTER_PURPOSE_GENERAL, resource,
pds_flags, DL_WANT_ANY_DIRSERVER);
}
tor_free(resource);
}
/** Return the max number of hashes to put in a URL for a given request.
*/
static int
max_dl_per_request(const or_options_t *options, int purpose)
{
/* Since squid does not like URLs >= 4096 bytes we limit it to 96.
* 4096 - strlen(http://[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535
* /tor/server/d/.z) == 4026
* 4026/41 (40 for the hash and 1 for the + that separates them) => 98
* So use 96 because it's a nice number.
*
* For microdescriptors, the calculation is
* 4096 - strlen(http://[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535
* /tor/micro/d/.z) == 4027
* 4027/44 (43 for the hash and 1 for the - that separates them) => 91
* So use 90 because it's a nice number.
*/
int max = 96;
if (purpose == DIR_PURPOSE_FETCH_MICRODESC) {
max = 90;
}
/* If we're going to tunnel our connections, we can ask for a lot more
* in a request. */
if (directory_must_use_begindir(options)) {
max = 500;
}
return max;
}
/** Don't split our requests so finely that we are requesting fewer than
* this number per server. (Grouping more than this at once leads to
* diminishing returns.) */
#define MIN_DL_PER_REQUEST 32
/** To prevent a single screwy cache from confusing us by selective reply,
* try to split our requests into at least this many requests. */
#define MIN_REQUESTS 3
/** If we want fewer than this many descriptors, wait until we
* want more, or until TestingClientMaxIntervalWithoutRequest has passed. */
#define MAX_DL_TO_DELAY 16
/** Given a <b>purpose</b> (FETCH_MICRODESC or FETCH_SERVERDESC) and a list of
* router descriptor digests or microdescriptor digest256s in
* <b>downloadable</b>, decide whether to delay fetching until we have more.
* If we don't want to delay, launch one or more requests to the appropriate
* directory authorities.
*/
void
launch_descriptor_downloads(int purpose,
smartlist_t *downloadable,
const routerstatus_t *source, time_t now)
{
const or_options_t *options = get_options();
const char *descname;
const int fetch_microdesc = (purpose == DIR_PURPOSE_FETCH_MICRODESC);
int n_downloadable = smartlist_len(downloadable);
int i, n_per_request, max_dl_per_req;
const char *req_plural = "", *rtr_plural = "";
int pds_flags = PDS_RETRY_IF_NO_SERVERS;
tor_assert(fetch_microdesc || purpose == DIR_PURPOSE_FETCH_SERVERDESC);
descname = fetch_microdesc ? "microdesc" : "routerdesc";
if (!n_downloadable)
return;
if (!directory_fetches_dir_info_early(options)) {
if (n_downloadable >= MAX_DL_TO_DELAY) {
log_debug(LD_DIR,
"There are enough downloadable %ss to launch requests.",
descname);
} else if (! router_have_minimum_dir_info()) {
log_debug(LD_DIR,
"We are only missing %d %ss, but we'll fetch anyway, since "
"we don't yet have enough directory info.",
n_downloadable, descname);
} else {
/* should delay */
if ((last_descriptor_download_attempted +
options->TestingClientMaxIntervalWithoutRequest) > now)
return;
if (last_descriptor_download_attempted) {
log_info(LD_DIR,
"There are not many downloadable %ss, but we've "
"been waiting long enough (%d seconds). Downloading.",
descname,
(int)(now-last_descriptor_download_attempted));
} else {
log_info(LD_DIR,
"There are not many downloadable %ss, but we haven't "
"tried downloading descriptors recently. Downloading.",
descname);
}
}
}
if (!authdir_mode(options)) {
/* If we wind up going to the authorities, we want to only open one
* connection to each authority at a time, so that we don't overload
* them. We do this by setting PDS_NO_EXISTING_SERVERDESC_FETCH
* regardless of whether we're a cache or not.
*
* Setting this flag can make initiate_descriptor_downloads() ignore
* requests. We need to make sure that we do in fact call
* update_router_descriptor_downloads() later on, once the connections
* have succeeded or failed.
*/
pds_flags |= fetch_microdesc ?
PDS_NO_EXISTING_MICRODESC_FETCH :
PDS_NO_EXISTING_SERVERDESC_FETCH;
}
n_per_request = CEIL_DIV(n_downloadable, MIN_REQUESTS);
max_dl_per_req = max_dl_per_request(options, purpose);
if (n_per_request > max_dl_per_req)
n_per_request = max_dl_per_req;
if (n_per_request < MIN_DL_PER_REQUEST) {
n_per_request = MIN(MIN_DL_PER_REQUEST, n_downloadable);
}
if (n_downloadable > n_per_request)
req_plural = rtr_plural = "s";
else if (n_downloadable > 1)
rtr_plural = "s";
log_info(LD_DIR,
"Launching %d request%s for %d %s%s, %d at a time",
CEIL_DIV(n_downloadable, n_per_request), req_plural,
n_downloadable, descname, rtr_plural, n_per_request);
smartlist_sort_digests(downloadable);
for (i=0; i < n_downloadable; i += n_per_request) {
initiate_descriptor_downloads(source, purpose,
downloadable, i, i+n_per_request,
pds_flags);
}
last_descriptor_download_attempted = now;
}
/** For any descriptor that we want that's currently listed in
* <b>consensus</b>, download it as appropriate. */
void
update_consensus_router_descriptor_downloads(time_t now, int is_vote,
networkstatus_t *consensus)
{
const or_options_t *options = get_options();
digestmap_t *map = NULL;
smartlist_t *no_longer_old = smartlist_new();
smartlist_t *downloadable = smartlist_new();
routerstatus_t *source = NULL;
int authdir = authdir_mode(options);
int n_delayed=0, n_have=0, n_would_reject=0, n_wouldnt_use=0,
n_inprogress=0, n_in_oldrouters=0;
if (directory_too_idle_to_fetch_descriptors(options, now))
goto done;
if (!consensus)
goto done;
if (is_vote) {
/* where's it from, so we know whom to ask for descriptors */
dir_server_t *ds;
networkstatus_voter_info_t *voter = smartlist_get(consensus->voters, 0);
tor_assert(voter);
ds = trusteddirserver_get_by_v3_auth_digest(voter->identity_digest);
if (ds)
source = &(ds->fake_status);
else
log_warn(LD_DIR, "couldn't lookup source from vote?");
}
map = digestmap_new();
list_pending_descriptor_downloads(map, 0);
SMARTLIST_FOREACH_BEGIN(consensus->routerstatus_list, void *, rsp) {
routerstatus_t *rs =
is_vote ? &(((vote_routerstatus_t *)rsp)->status) : rsp;
signed_descriptor_t *sd;
if ((sd = router_get_by_descriptor_digest(rs->descriptor_digest))) {
const routerinfo_t *ri;
++n_have;
if (!(ri = router_get_by_id_digest(rs->identity_digest)) ||
tor_memneq(ri->cache_info.signed_descriptor_digest,
sd->signed_descriptor_digest, DIGEST_LEN)) {
/* We have a descriptor with this digest, but either there is no
* entry in routerlist with the same ID (!ri), or there is one,
* but the identity digest differs (memneq).
*/
smartlist_add(no_longer_old, sd);
++n_in_oldrouters; /* We have it in old_routers. */
}
continue; /* We have it already. */
}
if (digestmap_get(map, rs->descriptor_digest)) {
++n_inprogress;
continue; /* We have an in-progress download. */
}
if (!download_status_is_ready(&rs->dl_status, now)) {
++n_delayed; /* Not ready for retry. */
continue;
}
if (authdir && dirserv_would_reject_router(rs)) {
++n_would_reject;
continue; /* We would throw it out immediately. */
}
if (!we_want_to_fetch_flavor(options, consensus->flavor) &&
!client_would_use_router(rs, now)) {
++n_wouldnt_use;
continue; /* We would never use it ourself. */
}
if (is_vote && source) {
char time_bufnew[ISO_TIME_LEN+1];
char time_bufold[ISO_TIME_LEN+1];
const routerinfo_t *oldrouter;
oldrouter = router_get_by_id_digest(rs->identity_digest);
format_iso_time(time_bufnew, rs->published_on);
if (oldrouter)
format_iso_time(time_bufold, oldrouter->cache_info.published_on);
log_info(LD_DIR, "Learned about %s (%s vs %s) from %s's vote (%s)",
routerstatus_describe(rs),
time_bufnew,
oldrouter ? time_bufold : "none",
source->nickname, oldrouter ? "known" : "unknown");
}
smartlist_add(downloadable, rs->descriptor_digest);
} SMARTLIST_FOREACH_END(rsp);
if (!authdir_mode_v3(options)
&& smartlist_len(no_longer_old)) {
routerlist_t *rl = router_get_routerlist();
log_info(LD_DIR, "%d router descriptors listed in consensus are "
"currently in old_routers; making them current.",
smartlist_len(no_longer_old));
SMARTLIST_FOREACH_BEGIN(no_longer_old, signed_descriptor_t *, sd) {
const char *msg;
was_router_added_t r;
time_t tmp_cert_expiration_time;
routerinfo_t *ri = routerlist_reparse_old(rl, sd);
if (!ri) {
log_warn(LD_BUG, "Failed to re-parse a router.");
continue;
}
/* need to remember for below, since add_to_routerlist may free. */
tmp_cert_expiration_time = ri->cert_expiration_time;
r = router_add_to_routerlist(ri, &msg, 1, 0);
if (WRA_WAS_OUTDATED(r)) {
log_warn(LD_DIR, "Couldn't add re-parsed router: %s. This isn't "
"usually a big deal, but you should make sure that your "
"clock and timezone are set correctly.",
msg?msg:"???");
if (r == ROUTER_CERTS_EXPIRED) {
char time_cons[ISO_TIME_LEN+1];
char time_cert_expires[ISO_TIME_LEN+1];
format_iso_time(time_cons, consensus->valid_after);
format_iso_time(time_cert_expires, tmp_cert_expiration_time);
log_warn(LD_DIR, " (I'm looking at a consensus from %s; This "
"router's certificates began expiring at %s.)",
time_cons, time_cert_expires);
}
}
} SMARTLIST_FOREACH_END(sd);
routerlist_assert_ok(rl);
}
log_info(LD_DIR,
"%d router descriptors downloadable. %d delayed; %d present "
"(%d of those were in old_routers); %d would_reject; "
"%d wouldnt_use; %d in progress.",
smartlist_len(downloadable), n_delayed, n_have, n_in_oldrouters,
n_would_reject, n_wouldnt_use, n_inprogress);
launch_descriptor_downloads(DIR_PURPOSE_FETCH_SERVERDESC,
downloadable, source, now);
digestmap_free(map, NULL);
done:
smartlist_free(downloadable);
smartlist_free(no_longer_old);
}
/** How often should we launch a server/authority request to be sure of getting
* a guess for our IP? */
/*XXXX+ this info should come from netinfo cells or something, or we should
* do this only when we aren't seeing incoming data. see bug 652. */
#define DUMMY_DOWNLOAD_INTERVAL (20*60)
/** As needed, launch a dummy router descriptor fetch to see if our
* address has changed. */
static void
launch_dummy_descriptor_download_as_needed(time_t now,
const or_options_t *options)
{
static time_t last_dummy_download = 0;
/* XXXX+ we could be smarter here; see notes on bug 652. */
/* If we're a server that doesn't have a configured address, we rely on
* directory fetches to learn when our address changes. So if we haven't
* tried to get any routerdescs in a long time, try a dummy fetch now. */
if (!options->Address &&
server_mode(options) &&
last_descriptor_download_attempted + DUMMY_DOWNLOAD_INTERVAL < now &&
last_dummy_download + DUMMY_DOWNLOAD_INTERVAL < now) {
last_dummy_download = now;
/* XX/teor - do we want an authority here, because they are less likely
* to give us the wrong address? (See #17782)
* I'm leaving the previous behaviour intact, because I don't like
* the idea of some relays contacting an authority every 20 minutes. */
directory_get_from_dirserver(DIR_PURPOSE_FETCH_SERVERDESC,
ROUTER_PURPOSE_GENERAL, "authority.z",
PDS_RETRY_IF_NO_SERVERS,
DL_WANT_ANY_DIRSERVER);
}
}
/** Launch downloads for router status as needed. */
void
update_router_descriptor_downloads(time_t now)
{
const or_options_t *options = get_options();
if (should_delay_dir_fetches(options, NULL))
return;
if (!we_fetch_router_descriptors(options))
return;
update_consensus_router_descriptor_downloads(now, 0,
networkstatus_get_reasonably_live_consensus(now, FLAV_NS));
}
/** Launch extrainfo downloads as needed. */
void
update_extrainfo_downloads(time_t now)
{
const or_options_t *options = get_options();
routerlist_t *rl;
smartlist_t *wanted;
digestmap_t *pending;
int old_routers, i, max_dl_per_req;
int n_no_ei = 0, n_pending = 0, n_have = 0, n_delay = 0, n_bogus[2] = {0,0};
if (! options->DownloadExtraInfo)
return;
if (should_delay_dir_fetches(options, NULL))
return;
if (!router_have_minimum_dir_info())
return;
pending = digestmap_new();
list_pending_descriptor_downloads(pending, 1);
rl = router_get_routerlist();
wanted = smartlist_new();
for (old_routers = 0; old_routers < 2; ++old_routers) {
smartlist_t *lst = old_routers ? rl->old_routers : rl->routers;
for (i = 0; i < smartlist_len(lst); ++i) {
signed_descriptor_t *sd;
char *d;
if (old_routers)
sd = smartlist_get(lst, i);
else
sd = &((routerinfo_t*)smartlist_get(lst, i))->cache_info;
if (sd->is_extrainfo)
continue; /* This should never happen. */
if (old_routers && !router_get_by_id_digest(sd->identity_digest))
continue; /* Couldn't check the signature if we got it. */
if (sd->extrainfo_is_bogus)
continue;
d = sd->extra_info_digest;
if (tor_digest_is_zero(d)) {
++n_no_ei;
continue;
}
if (eimap_get(rl->extra_info_map, d)) {
++n_have;
continue;
}
if (!download_status_is_ready(&sd->ei_dl_status, now)) {
++n_delay;
continue;
}
if (digestmap_get(pending, d)) {
++n_pending;
continue;
}
const signed_descriptor_t *sd2 = router_get_by_extrainfo_digest(d);
if (sd2 != sd) {
if (sd2 != NULL) {
char d1[HEX_DIGEST_LEN+1], d2[HEX_DIGEST_LEN+1];
char d3[HEX_DIGEST_LEN+1], d4[HEX_DIGEST_LEN+1];
base16_encode(d1, sizeof(d1), sd->identity_digest, DIGEST_LEN);
base16_encode(d2, sizeof(d2), sd2->identity_digest, DIGEST_LEN);
base16_encode(d3, sizeof(d3), d, DIGEST_LEN);
base16_encode(d4, sizeof(d3), sd2->extra_info_digest, DIGEST_LEN);
log_info(LD_DIR, "Found an entry in %s with mismatched "
"router_get_by_extrainfo_digest() value. This has ID %s "
"but the entry in the map has ID %s. This has EI digest "
"%s and the entry in the map has EI digest %s.",
old_routers?"old_routers":"routers",
d1, d2, d3, d4);
} else {
char d1[HEX_DIGEST_LEN+1], d2[HEX_DIGEST_LEN+1];
base16_encode(d1, sizeof(d1), sd->identity_digest, DIGEST_LEN);
base16_encode(d2, sizeof(d2), d, DIGEST_LEN);
log_info(LD_DIR, "Found an entry in %s with NULL "
"router_get_by_extrainfo_digest() value. This has ID %s "
"and EI digest %s.",
old_routers?"old_routers":"routers",
d1, d2);
}
++n_bogus[old_routers];
continue;
}
smartlist_add(wanted, d);
}
}
digestmap_free(pending, NULL);
log_info(LD_DIR, "Extrainfo download status: %d router with no ei, %d "
"with present ei, %d delaying, %d pending, %d downloadable, %d "
"bogus in routers, %d bogus in old_routers",
n_no_ei, n_have, n_delay, n_pending, smartlist_len(wanted),
n_bogus[0], n_bogus[1]);
smartlist_shuffle(wanted);
max_dl_per_req = max_dl_per_request(options, DIR_PURPOSE_FETCH_EXTRAINFO);
for (i = 0; i < smartlist_len(wanted); i += max_dl_per_req) {
initiate_descriptor_downloads(NULL, DIR_PURPOSE_FETCH_EXTRAINFO,
wanted, i, i+max_dl_per_req,
PDS_RETRY_IF_NO_SERVERS|PDS_NO_EXISTING_SERVERDESC_FETCH);
}
smartlist_free(wanted);
}
/** Reset the consensus and extra-info download failure count on all routers.
* When we get a new consensus,
* routers_update_status_from_consensus_networkstatus() will reset the
* download statuses on the descriptors in that consensus.
*/
void
router_reset_descriptor_download_failures(void)
{
log_debug(LD_GENERAL,
"In router_reset_descriptor_download_failures()");
networkstatus_reset_download_failures();
last_descriptor_download_attempted = 0;
if (!routerlist)
return;
/* We want to download *all* extra-info descriptors, not just those in
* the consensus we currently have (or are about to have) */
SMARTLIST_FOREACH(routerlist->routers, routerinfo_t *, ri,
{
download_status_reset(&ri->cache_info.ei_dl_status);
});
SMARTLIST_FOREACH(routerlist->old_routers, signed_descriptor_t *, sd,
{
download_status_reset(&sd->ei_dl_status);
});
}
/** Any changes in a router descriptor's publication time larger than this are
* automatically non-cosmetic. */
#define ROUTER_MAX_COSMETIC_TIME_DIFFERENCE (2*60*60)
/** We allow uptime to vary from how much it ought to be by this much. */
#define ROUTER_ALLOW_UPTIME_DRIFT (6*60*60)
/** Return true iff the only differences between r1 and r2 are such that
* would not cause a recent (post 0.1.1.6) dirserver to republish.
*/
int
router_differences_are_cosmetic(const routerinfo_t *r1, const routerinfo_t *r2)
{
time_t r1pub, r2pub;
long time_difference;
tor_assert(r1 && r2);
/* r1 should be the one that was published first. */
if (r1->cache_info.published_on > r2->cache_info.published_on) {
const routerinfo_t *ri_tmp = r2;
r2 = r1;
r1 = ri_tmp;
}
/* If any key fields differ, they're different. */
if (r1->addr != r2->addr ||
strcasecmp(r1->nickname, r2->nickname) ||
r1->or_port != r2->or_port ||
!tor_addr_eq(&r1->ipv6_addr, &r2->ipv6_addr) ||
r1->ipv6_orport != r2->ipv6_orport ||
r1->dir_port != r2->dir_port ||
r1->purpose != r2->purpose ||
!crypto_pk_eq_keys(r1->onion_pkey, r2->onion_pkey) ||
!crypto_pk_eq_keys(r1->identity_pkey, r2->identity_pkey) ||
strcasecmp(r1->platform, r2->platform) ||
(r1->contact_info && !r2->contact_info) || /* contact_info is optional */
(!r1->contact_info && r2->contact_info) ||
(r1->contact_info && r2->contact_info &&
strcasecmp(r1->contact_info, r2->contact_info)) ||
r1->is_hibernating != r2->is_hibernating ||
! addr_policies_eq(r1->exit_policy, r2->exit_policy) ||
(r1->supports_tunnelled_dir_requests !=
r2->supports_tunnelled_dir_requests))
return 0;
if ((r1->declared_family == NULL) != (r2->declared_family == NULL))
return 0;
if (r1->declared_family && r2->declared_family) {
int i, n;
if (smartlist_len(r1->declared_family)!=smartlist_len(r2->declared_family))
return 0;
n = smartlist_len(r1->declared_family);
for (i=0; i < n; ++i) {
if (strcasecmp(smartlist_get(r1->declared_family, i),
smartlist_get(r2->declared_family, i)))
return 0;
}
}
/* Did bandwidth change a lot? */
if ((r1->bandwidthcapacity < r2->bandwidthcapacity/2) ||
(r2->bandwidthcapacity < r1->bandwidthcapacity/2))
return 0;
/* Did the bandwidthrate or bandwidthburst change? */
if ((r1->bandwidthrate != r2->bandwidthrate) ||
(r1->bandwidthburst != r2->bandwidthburst))
return 0;
/* Did more than 12 hours pass? */
if (r1->cache_info.published_on + ROUTER_MAX_COSMETIC_TIME_DIFFERENCE
< r2->cache_info.published_on)
return 0;
/* Did uptime fail to increase by approximately the amount we would think,
* give or take some slop? */
r1pub = r1->cache_info.published_on;
r2pub = r2->cache_info.published_on;
time_difference = labs(r2->uptime - (r1->uptime + (r2pub - r1pub)));
if (time_difference > ROUTER_ALLOW_UPTIME_DRIFT &&
time_difference > r1->uptime * .05 &&
time_difference > r2->uptime * .05)
return 0;
/* Otherwise, the difference is cosmetic. */
return 1;
}
/** Check whether <b>sd</b> describes a router descriptor compatible with the
* extrainfo document <b>ei</b>.
*
* <b>identity_pkey</b> (which must also be provided) is RSA1024 identity key
* for the router. We use it to check the signature of the extrainfo document,
* if it has not already been checked.
*
* If no router is compatible with <b>ei</b>, <b>ei</b> should be
* dropped. Return 0 for "compatible", return 1 for "reject, and inform
* whoever uploaded <b>ei</b>, and return -1 for "reject silently.". If
* <b>msg</b> is present, set *<b>msg</b> to a description of the
* incompatibility (if any).
*
* Set the extrainfo_is_bogus field in <b>sd</b> if the digests matched
* but the extrainfo was nonetheless incompatible.
**/
int
routerinfo_incompatible_with_extrainfo(const crypto_pk_t *identity_pkey,
extrainfo_t *ei,
signed_descriptor_t *sd,
const char **msg)
{
int digest_matches, digest256_matches, r=1;
tor_assert(identity_pkey);
tor_assert(sd);
tor_assert(ei);
if (ei->bad_sig) {
if (msg) *msg = "Extrainfo signature was bad, or signed with wrong key.";
return 1;
}
digest_matches = tor_memeq(ei->cache_info.signed_descriptor_digest,
sd->extra_info_digest, DIGEST_LEN);
/* Set digest256_matches to 1 if the digest is correct, or if no
* digest256 was in the ri. */
digest256_matches = tor_memeq(ei->digest256,
sd->extra_info_digest256, DIGEST256_LEN);
digest256_matches |=
tor_mem_is_zero(sd->extra_info_digest256, DIGEST256_LEN);
/* The identity must match exactly to have been generated at the same time
* by the same router. */
if (tor_memneq(sd->identity_digest,
ei->cache_info.identity_digest,
DIGEST_LEN)) {
if (msg) *msg = "Extrainfo nickname or identity did not match routerinfo";
goto err; /* different servers */
}
if (! tor_cert_opt_eq(sd->signing_key_cert,
ei->cache_info.signing_key_cert)) {
if (msg) *msg = "Extrainfo signing key cert didn't match routerinfo";
goto err; /* different servers */
}
if (ei->pending_sig) {
char signed_digest[128];
if (crypto_pk_public_checksig(identity_pkey,
signed_digest, sizeof(signed_digest),
ei->pending_sig, ei->pending_sig_len) != DIGEST_LEN ||
tor_memneq(signed_digest, ei->cache_info.signed_descriptor_digest,
DIGEST_LEN)) {
ei->bad_sig = 1;
tor_free(ei->pending_sig);
if (msg) *msg = "Extrainfo signature bad, or signed with wrong key";
goto err; /* Bad signature, or no match. */
}
ei->cache_info.send_unencrypted = sd->send_unencrypted;
tor_free(ei->pending_sig);
}
if (ei->cache_info.published_on < sd->published_on) {
if (msg) *msg = "Extrainfo published time did not match routerdesc";
goto err;
} else if (ei->cache_info.published_on > sd->published_on) {
if (msg) *msg = "Extrainfo published time did not match routerdesc";
r = -1;
goto err;
}
if (!digest256_matches && !digest_matches) {
if (msg) *msg = "Neither digest256 or digest matched "
"digest from routerdesc";
goto err;
}
if (!digest256_matches) {
if (msg) *msg = "Extrainfo digest did not match digest256 from routerdesc";
goto err; /* Digest doesn't match declared value. */
}
if (!digest_matches) {
if (msg) *msg = "Extrainfo digest did not match value from routerdesc";
goto err; /* Digest doesn't match declared value. */
}
return 0;
err:
if (digest_matches) {
/* This signature was okay, and the digest was right: This is indeed the
* corresponding extrainfo. But insanely, it doesn't match the routerinfo
* that lists it. Don't try to fetch this one again. */
sd->extrainfo_is_bogus = 1;
}
return r;
}
/* Does ri have a valid ntor onion key?
* Valid ntor onion keys exist and have at least one non-zero byte. */
int
routerinfo_has_curve25519_onion_key(const routerinfo_t *ri)
{
if (!ri) {
return 0;
}
if (!ri->onion_curve25519_pkey) {
return 0;
}
if (tor_mem_is_zero((const char*)ri->onion_curve25519_pkey->public_key,
CURVE25519_PUBKEY_LEN)) {
return 0;
}
return 1;
}
/* Is rs running a tor version known to support EXTEND2 cells?
* If allow_unknown_versions is true, return true if we can't tell
* (from a versions line or a protocols line) whether it supports extend2
* cells.
* Otherwise, return false if the version is unknown. */
int
routerstatus_version_supports_extend2_cells(const routerstatus_t *rs,
int allow_unknown_versions)
{
if (!rs) {
return allow_unknown_versions;
}
if (!rs->pv.protocols_known) {
return allow_unknown_versions;
}
return rs->pv.supports_extend2_cells;
}
/** Assert that the internal representation of <b>rl</b> is
* self-consistent. */
void
routerlist_assert_ok(const routerlist_t *rl)
{
routerinfo_t *r2;
signed_descriptor_t *sd2;
if (!rl)
return;
SMARTLIST_FOREACH_BEGIN(rl->routers, routerinfo_t *, r) {
r2 = rimap_get(rl->identity_map, r->cache_info.identity_digest);
tor_assert(r == r2);
sd2 = sdmap_get(rl->desc_digest_map,
r->cache_info.signed_descriptor_digest);
tor_assert(&(r->cache_info) == sd2);
tor_assert(r->cache_info.routerlist_index == r_sl_idx);
/* XXXX
*
* Hoo boy. We need to fix this one, and the fix is a bit tricky, so
* commenting this out is just a band-aid.
*
* The problem is that, although well-behaved router descriptors
* should never have the same value for their extra_info_digest, it's
* possible for ill-behaved routers to claim whatever they like there.
*
* The real answer is to trash desc_by_eid_map and instead have
* something that indicates for a given extra-info digest we want,
* what its download status is. We'll do that as a part of routerlist
* refactoring once consensus directories are in. For now,
* this rep violation is probably harmless: an adversary can make us
* reset our retry count for an extrainfo, but that's not the end
* of the world. Changing the representation in 0.2.0.x would just
* destabilize the codebase.
if (!tor_digest_is_zero(r->cache_info.extra_info_digest)) {
signed_descriptor_t *sd3 =
sdmap_get(rl->desc_by_eid_map, r->cache_info.extra_info_digest);
tor_assert(sd3 == &(r->cache_info));
}
*/
} SMARTLIST_FOREACH_END(r);
SMARTLIST_FOREACH_BEGIN(rl->old_routers, signed_descriptor_t *, sd) {
r2 = rimap_get(rl->identity_map, sd->identity_digest);
tor_assert(!r2 || sd != &(r2->cache_info));
sd2 = sdmap_get(rl->desc_digest_map, sd->signed_descriptor_digest);
tor_assert(sd == sd2);
tor_assert(sd->routerlist_index == sd_sl_idx);
/* XXXX see above.
if (!tor_digest_is_zero(sd->extra_info_digest)) {
signed_descriptor_t *sd3 =
sdmap_get(rl->desc_by_eid_map, sd->extra_info_digest);
tor_assert(sd3 == sd);
}
*/
} SMARTLIST_FOREACH_END(sd);
RIMAP_FOREACH(rl->identity_map, d, r) {
tor_assert(tor_memeq(r->cache_info.identity_digest, d, DIGEST_LEN));
} DIGESTMAP_FOREACH_END;
SDMAP_FOREACH(rl->desc_digest_map, d, sd) {
tor_assert(tor_memeq(sd->signed_descriptor_digest, d, DIGEST_LEN));
} DIGESTMAP_FOREACH_END;
SDMAP_FOREACH(rl->desc_by_eid_map, d, sd) {
tor_assert(!tor_digest_is_zero(d));
tor_assert(sd);
tor_assert(tor_memeq(sd->extra_info_digest, d, DIGEST_LEN));
} DIGESTMAP_FOREACH_END;
EIMAP_FOREACH(rl->extra_info_map, d, ei) {
signed_descriptor_t *sd;
tor_assert(tor_memeq(ei->cache_info.signed_descriptor_digest,
d, DIGEST_LEN));
sd = sdmap_get(rl->desc_by_eid_map,
ei->cache_info.signed_descriptor_digest);
// tor_assert(sd); // XXXX see above
if (sd) {
tor_assert(tor_memeq(ei->cache_info.signed_descriptor_digest,
sd->extra_info_digest, DIGEST_LEN));
}
} DIGESTMAP_FOREACH_END;
}
/** Allocate and return a new string representing the contact info
* and platform string for <b>router</b>,
* surrounded by quotes and using standard C escapes.
*
* THIS FUNCTION IS NOT REENTRANT. Don't call it from outside the main
* thread. Also, each call invalidates the last-returned value, so don't
* try log_warn(LD_GENERAL, "%s %s", esc_router_info(a), esc_router_info(b));
*
* If <b>router</b> is NULL, it just frees its internal memory and returns.
*/
const char *
esc_router_info(const routerinfo_t *router)
{
static char *info=NULL;
char *esc_contact, *esc_platform;
tor_free(info);
if (!router)
return NULL; /* we're exiting; just free the memory we use */
esc_contact = esc_for_log(router->contact_info);
esc_platform = esc_for_log(router->platform);
tor_asprintf(&info, "Contact %s, Platform %s", esc_contact, esc_platform);
tor_free(esc_contact);
tor_free(esc_platform);
return info;
}
/** Helper for sorting: compare two routerinfos by their identity
* digest. */
static int
compare_routerinfo_by_id_digest_(const void **a, const void **b)
{
routerinfo_t *first = *(routerinfo_t **)a, *second = *(routerinfo_t **)b;
return fast_memcmp(first->cache_info.identity_digest,
second->cache_info.identity_digest,
DIGEST_LEN);
}
/** Sort a list of routerinfo_t in ascending order of identity digest. */
void
routers_sort_by_identity(smartlist_t *routers)
{
smartlist_sort(routers, compare_routerinfo_by_id_digest_);
}
/** Called when we change a node set, or when we reload the geoip IPv4 list:
* recompute all country info in all configuration node sets and in the
* routerlist. */
void
refresh_all_country_info(void)
{
const or_options_t *options = get_options();
if (options->EntryNodes)
routerset_refresh_countries(options->EntryNodes);
if (options->ExitNodes)
routerset_refresh_countries(options->ExitNodes);
if (options->ExcludeNodes)
routerset_refresh_countries(options->ExcludeNodes);
if (options->ExcludeExitNodes)
routerset_refresh_countries(options->ExcludeExitNodes);
if (options->ExcludeExitNodesUnion_)
routerset_refresh_countries(options->ExcludeExitNodesUnion_);
nodelist_refresh_countries();
}
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