router.c
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上传日期:2019-07-14
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文件大小:65k
- /* Copyright (c) 2001 Matej Pfajfar.
- * Copyright (c) 2001-2004, Roger Dingledine.
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
- * Copyright (c) 2007-2009, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- #define ROUTER_PRIVATE
- #include "or.h"
- /**
- * file router.c
- * brief OR functionality, including key maintenance, generating
- * and uploading server descriptors, retrying OR connections.
- **/
- extern long stats_n_seconds_working;
- /************************************************************/
- /*****
- * Key management: ORs only.
- *****/
- /** Private keys for this OR. There is also an SSL key managed by tortls.c.
- */
- static tor_mutex_t *key_lock=NULL;
- static time_t onionkey_set_at=0; /**< When was onionkey last changed? */
- /** Current private onionskin decryption key: used to decode CREATE cells. */
- static crypto_pk_env_t *onionkey=NULL;
- /** Previous private onionskin decryption key: used to decode CREATE cells
- * generated by clients that have an older version of our descriptor. */
- static crypto_pk_env_t *lastonionkey=NULL;
- /** Private "identity key": used to sign directory info and TLS
- * certificates. Never changes. */
- static crypto_pk_env_t *identitykey=NULL;
- /** Digest of identitykey. */
- static char identitykey_digest[DIGEST_LEN];
- /** Signing key used for v3 directory material; only set for authorities. */
- static crypto_pk_env_t *authority_signing_key = NULL;
- /** Key certificate to authenticate v3 directory material; only set for
- * authorities. */
- static authority_cert_t *authority_key_certificate = NULL;
- /** For emergency V3 authority key migration: An extra signing key that we use
- * with our old (obsolete) identity key for a while. */
- static crypto_pk_env_t *legacy_signing_key = NULL;
- /** For emergency V3 authority key migration: An extra certificate to
- * authenticate legacy_signing_key with our obsolete identity key.*/
- static authority_cert_t *legacy_key_certificate = NULL;
- /* (Note that v3 authorities also have a separate "authority identity key",
- * but this key is never actually loaded by the Tor process. Instead, it's
- * used by tor-gencert to sign new signing keys and make new key
- * certificates. */
- /** Replace the current onion key with <b>k</b>. Does not affect
- * lastonionkey; to update lastonionkey correctly, call rotate_onion_key().
- */
- static void
- set_onion_key(crypto_pk_env_t *k)
- {
- tor_mutex_acquire(key_lock);
- if (onionkey)
- crypto_free_pk_env(onionkey);
- onionkey = k;
- onionkey_set_at = time(NULL);
- tor_mutex_release(key_lock);
- mark_my_descriptor_dirty();
- }
- /** Return the current onion key. Requires that the onion key has been
- * loaded or generated. */
- crypto_pk_env_t *
- get_onion_key(void)
- {
- tor_assert(onionkey);
- return onionkey;
- }
- /** Store a full copy of the current onion key into *<b>key</b>, and a full
- * copy of the most recent onion key into *<b>last</b>.
- */
- void
- dup_onion_keys(crypto_pk_env_t **key, crypto_pk_env_t **last)
- {
- tor_assert(key);
- tor_assert(last);
- tor_mutex_acquire(key_lock);
- tor_assert(onionkey);
- *key = crypto_pk_copy_full(onionkey);
- if (lastonionkey)
- *last = crypto_pk_copy_full(lastonionkey);
- else
- *last = NULL;
- tor_mutex_release(key_lock);
- }
- /** Return the time when the onion key was last set. This is either the time
- * when the process launched, or the time of the most recent key rotation since
- * the process launched.
- */
- time_t
- get_onion_key_set_at(void)
- {
- return onionkey_set_at;
- }
- /** Set the current identity key to k.
- */
- void
- set_identity_key(crypto_pk_env_t *k)
- {
- if (identitykey)
- crypto_free_pk_env(identitykey);
- identitykey = k;
- crypto_pk_get_digest(identitykey, identitykey_digest);
- }
- /** Returns the current identity key; requires that the identity key has been
- * set.
- */
- crypto_pk_env_t *
- get_identity_key(void)
- {
- tor_assert(identitykey);
- return identitykey;
- }
- /** Return true iff the identity key has been set. */
- int
- identity_key_is_set(void)
- {
- return identitykey != NULL;
- }
- /** Return the key certificate for this v3 (voting) authority, or NULL
- * if we have no such certificate. */
- authority_cert_t *
- get_my_v3_authority_cert(void)
- {
- return authority_key_certificate;
- }
- /** Return the v3 signing key for this v3 (voting) authority, or NULL
- * if we have no such key. */
- crypto_pk_env_t *
- get_my_v3_authority_signing_key(void)
- {
- return authority_signing_key;
- }
- /** If we're an authority, and we're using a legacy authority identity key for
- * emergency migration purposes, return the certificate associated with that
- * key. */
- authority_cert_t *
- get_my_v3_legacy_cert(void)
- {
- return legacy_key_certificate;
- }
- /** If we're an authority, and we're using a legacy authority identity key for
- * emergency migration purposes, return that key. */
- crypto_pk_env_t *
- get_my_v3_legacy_signing_key(void)
- {
- return legacy_signing_key;
- }
- /** Replace the previous onion key with the current onion key, and generate
- * a new previous onion key. Immediately after calling this function,
- * the OR should:
- * - schedule all previous cpuworkers to shut down _after_ processing
- * pending work. (This will cause fresh cpuworkers to be generated.)
- * - generate and upload a fresh routerinfo.
- */
- void
- rotate_onion_key(void)
- {
- char *fname, *fname_prev;
- crypto_pk_env_t *prkey;
- or_state_t *state = get_or_state();
- time_t now;
- fname = get_datadir_fname2("keys", "secret_onion_key");
- fname_prev = get_datadir_fname2("keys", "secret_onion_key.old");
- if (!(prkey = crypto_new_pk_env())) {
- log_err(LD_GENERAL,"Error constructing rotated onion key");
- goto error;
- }
- if (crypto_pk_generate_key(prkey)) {
- log_err(LD_BUG,"Error generating onion key");
- goto error;
- }
- if (file_status(fname) == FN_FILE) {
- if (replace_file(fname, fname_prev))
- goto error;
- }
- if (crypto_pk_write_private_key_to_filename(prkey, fname)) {
- log_err(LD_FS,"Couldn't write generated onion key to "%s".", fname);
- goto error;
- }
- log_info(LD_GENERAL, "Rotating onion key");
- tor_mutex_acquire(key_lock);
- if (lastonionkey)
- crypto_free_pk_env(lastonionkey);
- lastonionkey = onionkey;
- onionkey = prkey;
- now = time(NULL);
- state->LastRotatedOnionKey = onionkey_set_at = now;
- tor_mutex_release(key_lock);
- mark_my_descriptor_dirty();
- or_state_mark_dirty(state, get_options()->AvoidDiskWrites ? now+3600 : 0);
- goto done;
- error:
- log_warn(LD_GENERAL, "Couldn't rotate onion key.");
- if (prkey)
- crypto_free_pk_env(prkey);
- done:
- tor_free(fname);
- tor_free(fname_prev);
- }
- /** Try to read an RSA key from <b>fname</b>. If <b>fname</b> doesn't exist
- * and <b>generate</b> is true, create a new RSA key and save it in
- * <b>fname</b>. Return the read/created key, or NULL on error. Log all
- * errors at level <b>severity</b>.
- */
- crypto_pk_env_t *
- init_key_from_file(const char *fname, int generate, int severity)
- {
- crypto_pk_env_t *prkey = NULL;
- if (!(prkey = crypto_new_pk_env())) {
- log(severity, LD_GENERAL,"Error constructing key");
- goto error;
- }
- switch (file_status(fname)) {
- case FN_DIR:
- case FN_ERROR:
- log(severity, LD_FS,"Can't read key from "%s"", fname);
- goto error;
- case FN_NOENT:
- if (generate) {
- if (!have_lockfile()) {
- if (try_locking(get_options(), 0)<0) {
- /* Make sure that --list-fingerprint only creates new keys
- * if there is no possibility for a deadlock. */
- log(severity, LD_FS, "Another Tor process has locked "%s". Not "
- "writing any new keys.", fname);
- /*XXXX The 'other process' might make a key in a second or two;
- * maybe we should wait for it. */
- goto error;
- }
- }
- log_info(LD_GENERAL, "No key found in "%s"; generating fresh key.",
- fname);
- if (crypto_pk_generate_key(prkey)) {
- log(severity, LD_GENERAL,"Error generating onion key");
- goto error;
- }
- if (crypto_pk_check_key(prkey) <= 0) {
- log(severity, LD_GENERAL,"Generated key seems invalid");
- goto error;
- }
- log_info(LD_GENERAL, "Generated key seems valid");
- if (crypto_pk_write_private_key_to_filename(prkey, fname)) {
- log(severity, LD_FS,
- "Couldn't write generated key to "%s".", fname);
- goto error;
- }
- } else {
- log_info(LD_GENERAL, "No key found in "%s"", fname);
- }
- return prkey;
- case FN_FILE:
- if (crypto_pk_read_private_key_from_filename(prkey, fname)) {
- log(severity, LD_GENERAL,"Error loading private key.");
- goto error;
- }
- return prkey;
- default:
- tor_assert(0);
- }
- error:
- if (prkey)
- crypto_free_pk_env(prkey);
- return NULL;
- }
- /** Try to load the vote-signing private key and certificate for being a v3
- * directory authority, and make sure they match. If <b>legacy</b>, load a
- * legacy key/cert set for emergency key migration; otherwise load the regular
- * key/cert set. On success, store them into *<b>key_out</b> and
- * *<b>cert_out</b> respectively, and return 0. On failure, return -1. */
- static int
- load_authority_keyset(int legacy, crypto_pk_env_t **key_out,
- authority_cert_t **cert_out)
- {
- int r = -1;
- char *fname = NULL, *cert = NULL;
- const char *eos = NULL;
- crypto_pk_env_t *signing_key = NULL;
- authority_cert_t *parsed = NULL;
- fname = get_datadir_fname2("keys",
- legacy ? "legacy_signing_key" : "authority_signing_key");
- signing_key = init_key_from_file(fname, 0, LOG_INFO);
- if (!signing_key) {
- log_warn(LD_DIR, "No version 3 directory key found in %s", fname);
- goto done;
- }
- tor_free(fname);
- fname = get_datadir_fname2("keys",
- legacy ? "legacy_certificate" : "authority_certificate");
- cert = read_file_to_str(fname, 0, NULL);
- if (!cert) {
- log_warn(LD_DIR, "Signing key found, but no certificate found in %s",
- fname);
- goto done;
- }
- parsed = authority_cert_parse_from_string(cert, &eos);
- if (!parsed) {
- log_warn(LD_DIR, "Unable to parse certificate in %s", fname);
- goto done;
- }
- if (crypto_pk_cmp_keys(signing_key, parsed->signing_key) != 0) {
- log_warn(LD_DIR, "Stored signing key does not match signing key in "
- "certificate");
- goto done;
- }
- if (*key_out)
- crypto_free_pk_env(*key_out);
- if (*cert_out)
- authority_cert_free(*cert_out);
- *key_out = signing_key;
- *cert_out = parsed;
- r = 0;
- signing_key = NULL;
- parsed = NULL;
- done:
- tor_free(fname);
- tor_free(cert);
- if (signing_key)
- crypto_free_pk_env(signing_key);
- if (parsed)
- authority_cert_free(parsed);
- return r;
- }
- /** Load the v3 (voting) authority signing key and certificate, if they are
- * present. Return -1 if anything is missing, mismatched, or unloadable;
- * return 0 on success. */
- static int
- init_v3_authority_keys(void)
- {
- if (load_authority_keyset(0, &authority_signing_key,
- &authority_key_certificate)<0)
- return -1;
- if (get_options()->V3AuthUseLegacyKey &&
- load_authority_keyset(1, &legacy_signing_key,
- &legacy_key_certificate)<0)
- return -1;
- return 0;
- }
- /** If we're a v3 authority, check whether we have a certificate that's
- * likely to expire soon. Warn if we do, but not too often. */
- void
- v3_authority_check_key_expiry(void)
- {
- time_t now, expires;
- static time_t last_warned = 0;
- int badness, time_left, warn_interval;
- if (!authdir_mode_v3(get_options()) || !authority_key_certificate)
- return;
- now = time(NULL);
- expires = authority_key_certificate->expires;
- time_left = (int)( expires - now );
- if (time_left <= 0) {
- badness = LOG_ERR;
- warn_interval = 60*60;
- } else if (time_left <= 24*60*60) {
- badness = LOG_WARN;
- warn_interval = 60*60;
- } else if (time_left <= 24*60*60*7) {
- badness = LOG_WARN;
- warn_interval = 24*60*60;
- } else if (time_left <= 24*60*60*30) {
- badness = LOG_WARN;
- warn_interval = 24*60*60*5;
- } else {
- return;
- }
- if (last_warned + warn_interval > now)
- return;
- if (time_left <= 0) {
- log(badness, LD_DIR, "Your v3 authority certificate has expired."
- " Generate a new one NOW.");
- } else if (time_left <= 24*60*60) {
- log(badness, LD_DIR, "Your v3 authority certificate expires in %d hours;"
- " Generate a new one NOW.", time_left/(60*60));
- } else {
- log(badness, LD_DIR, "Your v3 authority certificate expires in %d days;"
- " Generate a new one soon.", time_left/(24*60*60));
- }
- last_warned = now;
- }
- /** Initialize all OR private keys, and the TLS context, as necessary.
- * On OPs, this only initializes the tls context. Return 0 on success,
- * or -1 if Tor should die.
- */
- int
- init_keys(void)
- {
- char *keydir;
- char fingerprint[FINGERPRINT_LEN+1];
- /*nickname<space>fpn */
- char fingerprint_line[MAX_NICKNAME_LEN+FINGERPRINT_LEN+3];
- const char *mydesc;
- crypto_pk_env_t *prkey;
- char digest[20];
- char v3_digest[20];
- char *cp;
- or_options_t *options = get_options();
- authority_type_t type;
- time_t now = time(NULL);
- trusted_dir_server_t *ds;
- int v3_digest_set = 0;
- authority_cert_t *cert = NULL;
- if (!key_lock)
- key_lock = tor_mutex_new();
- /* There are a couple of paths that put us here before */
- if (crypto_global_init(get_options()->HardwareAccel)) {
- log_err(LD_BUG, "Unable to initialize OpenSSL. Exiting.");
- return -1;
- }
- /* OP's don't need persistent keys; just make up an identity and
- * initialize the TLS context. */
- if (!server_mode(options)) {
- if (!(prkey = crypto_new_pk_env()))
- return -1;
- if (crypto_pk_generate_key(prkey)) {
- crypto_free_pk_env(prkey);
- return -1;
- }
- set_identity_key(prkey);
- /* Create a TLS context; default the client nickname to "client". */
- if (tor_tls_context_new(get_identity_key(), MAX_SSL_KEY_LIFETIME) < 0) {
- log_err(LD_GENERAL,"Error creating TLS context for Tor client.");
- return -1;
- }
- return 0;
- }
- /* Make sure DataDirectory exists, and is private. */
- if (check_private_dir(options->DataDirectory, CPD_CREATE)) {
- return -1;
- }
- /* Check the key directory. */
- keydir = get_datadir_fname("keys");
- if (check_private_dir(keydir, CPD_CREATE)) {
- tor_free(keydir);
- return -1;
- }
- tor_free(keydir);
- /* 1a. Read v3 directory authority key/cert information. */
- memset(v3_digest, 0, sizeof(v3_digest));
- if (authdir_mode_v3(options)) {
- if (init_v3_authority_keys()<0) {
- log_err(LD_GENERAL, "We're configured as a V3 authority, but we "
- "were unable to load our v3 authority keys and certificate! "
- "Use tor-gencert to generate them. Dying.");
- return -1;
- }
- cert = get_my_v3_authority_cert();
- if (cert) {
- crypto_pk_get_digest(get_my_v3_authority_cert()->identity_key,
- v3_digest);
- v3_digest_set = 1;
- }
- }
- /* 1. Read identity key. Make it if none is found. */
- keydir = get_datadir_fname2("keys", "secret_id_key");
- log_info(LD_GENERAL,"Reading/making identity key "%s"...",keydir);
- prkey = init_key_from_file(keydir, 1, LOG_ERR);
- tor_free(keydir);
- if (!prkey) return -1;
- set_identity_key(prkey);
- /* 2. Read onion key. Make it if none is found. */
- keydir = get_datadir_fname2("keys", "secret_onion_key");
- log_info(LD_GENERAL,"Reading/making onion key "%s"...",keydir);
- prkey = init_key_from_file(keydir, 1, LOG_ERR);
- tor_free(keydir);
- if (!prkey) return -1;
- set_onion_key(prkey);
- if (options->command == CMD_RUN_TOR) {
- /* only mess with the state file if we're actually running Tor */
- or_state_t *state = get_or_state();
- if (state->LastRotatedOnionKey > 100 && state->LastRotatedOnionKey < now) {
- /* We allow for some parsing slop, but we don't want to risk accepting
- * values in the distant future. If we did, we might never rotate the
- * onion key. */
- onionkey_set_at = state->LastRotatedOnionKey;
- } else {
- /* We have no LastRotatedOnionKey set; either we just created the key
- * or it's a holdover from 0.1.2.4-alpha-dev or earlier. In either case,
- * start the clock ticking now so that we will eventually rotate it even
- * if we don't stay up for a full MIN_ONION_KEY_LIFETIME. */
- state->LastRotatedOnionKey = onionkey_set_at = now;
- or_state_mark_dirty(state, options->AvoidDiskWrites ?
- time(NULL)+3600 : 0);
- }
- }
- keydir = get_datadir_fname2("keys", "secret_onion_key.old");
- if (!lastonionkey && file_status(keydir) == FN_FILE) {
- prkey = init_key_from_file(keydir, 1, LOG_ERR);
- if (prkey)
- lastonionkey = prkey;
- }
- tor_free(keydir);
- /* 3. Initialize link key and TLS context. */
- if (tor_tls_context_new(get_identity_key(), MAX_SSL_KEY_LIFETIME) < 0) {
- log_err(LD_GENERAL,"Error initializing TLS context");
- return -1;
- }
- /* 4. Build our router descriptor. */
- /* Must be called after keys are initialized. */
- mydesc = router_get_my_descriptor();
- if (authdir_mode(options)) {
- const char *m = NULL;
- routerinfo_t *ri;
- /* We need to add our own fingerprint so it gets recognized. */
- if (dirserv_add_own_fingerprint(options->Nickname, get_identity_key())) {
- log_err(LD_GENERAL,"Error adding own fingerprint to approved set");
- return -1;
- }
- if (mydesc) {
- ri = router_parse_entry_from_string(mydesc, NULL, 1, 0, NULL);
- if (!ri) {
- log_err(LD_GENERAL,"Generated a routerinfo we couldn't parse.");
- return -1;
- }
- if (!WRA_WAS_ADDED(dirserv_add_descriptor(ri, &m, "self"))) {
- log_err(LD_GENERAL,"Unable to add own descriptor to directory: %s",
- m?m:"<unknown error>");
- return -1;
- }
- }
- }
- /* 5. Dump fingerprint to 'fingerprint' */
- keydir = get_datadir_fname("fingerprint");
- log_info(LD_GENERAL,"Dumping fingerprint to "%s"...",keydir);
- if (crypto_pk_get_fingerprint(get_identity_key(), fingerprint, 0)<0) {
- log_err(LD_GENERAL,"Error computing fingerprint");
- tor_free(keydir);
- return -1;
- }
- tor_assert(strlen(options->Nickname) <= MAX_NICKNAME_LEN);
- if (tor_snprintf(fingerprint_line, sizeof(fingerprint_line),
- "%s %sn",options->Nickname, fingerprint) < 0) {
- log_err(LD_GENERAL,"Error writing fingerprint line");
- tor_free(keydir);
- return -1;
- }
- /* Check whether we need to write the fingerprint file. */
- cp = NULL;
- if (file_status(keydir) == FN_FILE)
- cp = read_file_to_str(keydir, 0, NULL);
- if (!cp || strcmp(cp, fingerprint_line)) {
- if (write_str_to_file(keydir, fingerprint_line, 0)) {
- log_err(LD_FS, "Error writing fingerprint line to file");
- tor_free(keydir);
- return -1;
- }
- }
- tor_free(cp);
- tor_free(keydir);
- log(LOG_NOTICE, LD_GENERAL,
- "Your Tor server's identity key fingerprint is '%s %s'",
- options->Nickname, fingerprint);
- if (!authdir_mode(options))
- return 0;
- /* 6. [authdirserver only] load approved-routers file */
- if (dirserv_load_fingerprint_file() < 0) {
- log_err(LD_GENERAL,"Error loading fingerprints");
- return -1;
- }
- /* 6b. [authdirserver only] add own key to approved directories. */
- crypto_pk_get_digest(get_identity_key(), digest);
- type = ((options->V1AuthoritativeDir ? V1_AUTHORITY : NO_AUTHORITY) |
- (options->V2AuthoritativeDir ? V2_AUTHORITY : NO_AUTHORITY) |
- (options->V3AuthoritativeDir ? V3_AUTHORITY : NO_AUTHORITY) |
- (options->BridgeAuthoritativeDir ? BRIDGE_AUTHORITY : NO_AUTHORITY) |
- (options->HSAuthoritativeDir ? HIDSERV_AUTHORITY : NO_AUTHORITY));
- ds = router_get_trusteddirserver_by_digest(digest);
- if (!ds) {
- ds = add_trusted_dir_server(options->Nickname, NULL,
- (uint16_t)options->DirPort,
- (uint16_t)options->ORPort,
- digest,
- v3_digest,
- type);
- if (!ds) {
- log_err(LD_GENERAL,"We want to be a directory authority, but we "
- "couldn't add ourselves to the authority list. Failing.");
- return -1;
- }
- }
- if (ds->type != type) {
- log_warn(LD_DIR, "Configured authority type does not match authority "
- "type in DirServer list. Adjusting. (%d v %d)",
- type, ds->type);
- ds->type = type;
- }
- if (v3_digest_set && (ds->type & V3_AUTHORITY) &&
- memcmp(v3_digest, ds->v3_identity_digest, DIGEST_LEN)) {
- log_warn(LD_DIR, "V3 identity key does not match identity declared in "
- "DirServer line. Adjusting.");
- memcpy(ds->v3_identity_digest, v3_digest, DIGEST_LEN);
- }
- if (cert) { /* add my own cert to the list of known certs */
- log_info(LD_DIR, "adding my own v3 cert");
- if (trusted_dirs_load_certs_from_string(
- cert->cache_info.signed_descriptor_body, 0, 0)<0) {
- log_warn(LD_DIR, "Unable to parse my own v3 cert! Failing.");
- return -1;
- }
- }
- return 0; /* success */
- }
- /* Keep track of whether we should upload our server descriptor,
- * and what type of server we are.
- */
- /** Whether we can reach our ORPort from the outside. */
- static int can_reach_or_port = 0;
- /** Whether we can reach our DirPort from the outside. */
- static int can_reach_dir_port = 0;
- /** Forget what we have learned about our reachability status. */
- void
- router_reset_reachability(void)
- {
- can_reach_or_port = can_reach_dir_port = 0;
- }
- /** Return 1 if ORPort is known reachable; else return 0. */
- int
- check_whether_orport_reachable(void)
- {
- or_options_t *options = get_options();
- return options->AssumeReachable ||
- can_reach_or_port;
- }
- /** Return 1 if we don't have a dirport configured, or if it's reachable. */
- int
- check_whether_dirport_reachable(void)
- {
- or_options_t *options = get_options();
- return !options->DirPort ||
- options->AssumeReachable ||
- we_are_hibernating() ||
- can_reach_dir_port;
- }
- /** Look at a variety of factors, and return 0 if we don't want to
- * advertise the fact that we have a DirPort open. Else return the
- * DirPort we want to advertise.
- *
- * Log a helpful message if we change our mind about whether to publish
- * a DirPort.
- */
- static int
- decide_to_advertise_dirport(or_options_t *options, uint16_t dir_port)
- {
- static int advertising=1; /* start out assuming we will advertise */
- int new_choice=1;
- const char *reason = NULL;
- /* Section one: reasons to publish or not publish that aren't
- * worth mentioning to the user, either because they're obvious
- * or because they're normal behavior. */
- if (!dir_port) /* short circuit the rest of the function */
- return 0;
- if (authdir_mode(options)) /* always publish */
- return dir_port;
- if (we_are_hibernating())
- return 0;
- if (!check_whether_dirport_reachable())
- return 0;
- /* Section two: reasons to publish or not publish that the user
- * might find surprising. These are generally config options that
- * make us choose not to publish. */
- if (accounting_is_enabled(options)) {
- /* if we might potentially hibernate */
- new_choice = 0;
- reason = "AccountingMax enabled";
- #define MIN_BW_TO_ADVERTISE_DIRPORT 51200
- } else if (options->BandwidthRate < MIN_BW_TO_ADVERTISE_DIRPORT ||
- (options->RelayBandwidthRate > 0 &&
- options->RelayBandwidthRate < MIN_BW_TO_ADVERTISE_DIRPORT)) {
- /* if we're advertising a small amount */
- new_choice = 0;
- reason = "BandwidthRate under 50KB";
- }
- if (advertising != new_choice) {
- if (new_choice == 1) {
- log(LOG_NOTICE, LD_DIR, "Advertising DirPort as %d", dir_port);
- } else {
- tor_assert(reason);
- log(LOG_NOTICE, LD_DIR, "Not advertising DirPort (Reason: %s)", reason);
- }
- advertising = new_choice;
- }
- return advertising ? dir_port : 0;
- }
- /** Some time has passed, or we just got new directory information.
- * See if we currently believe our ORPort or DirPort to be
- * unreachable. If so, launch a new test for it.
- *
- * For ORPort, we simply try making a circuit that ends at ourselves.
- * Success is noticed in onionskin_answer().
- *
- * For DirPort, we make a connection via Tor to our DirPort and ask
- * for our own server descriptor.
- * Success is noticed in connection_dir_client_reached_eof().
- */
- void
- consider_testing_reachability(int test_or, int test_dir)
- {
- routerinfo_t *me = router_get_my_routerinfo();
- int orport_reachable = check_whether_orport_reachable();
- tor_addr_t addr;
- if (!me)
- return;
- if (test_or && (!orport_reachable || !circuit_enough_testing_circs())) {
- log_info(LD_CIRC, "Testing %s of my ORPort: %s:%d.",
- !orport_reachable ? "reachability" : "bandwidth",
- me->address, me->or_port);
- circuit_launch_by_router(CIRCUIT_PURPOSE_TESTING, me,
- CIRCLAUNCH_NEED_CAPACITY|CIRCLAUNCH_IS_INTERNAL);
- }
- tor_addr_from_ipv4h(&addr, me->addr);
- if (test_dir && !check_whether_dirport_reachable() &&
- !connection_get_by_type_addr_port_purpose(
- CONN_TYPE_DIR, &addr, me->dir_port,
- DIR_PURPOSE_FETCH_SERVERDESC)) {
- /* ask myself, via tor, for my server descriptor. */
- directory_initiate_command(me->address, &addr,
- me->or_port, me->dir_port,
- 0, /* does not matter */
- 0, me->cache_info.identity_digest,
- DIR_PURPOSE_FETCH_SERVERDESC,
- ROUTER_PURPOSE_GENERAL,
- 1, "authority.z", NULL, 0, 0);
- }
- }
- /** Annotate that we found our ORPort reachable. */
- void
- router_orport_found_reachable(void)
- {
- if (!can_reach_or_port) {
- routerinfo_t *me = router_get_my_routerinfo();
- log_notice(LD_OR,"Self-testing indicates your ORPort is reachable from "
- "the outside. Excellent.%s",
- get_options()->_PublishServerDescriptor != NO_AUTHORITY ?
- " Publishing server descriptor." : "");
- can_reach_or_port = 1;
- mark_my_descriptor_dirty();
- if (!me) { /* should never happen */
- log_warn(LD_BUG, "ORPort found reachable, but I have no routerinfo "
- "yet. Failing to inform controller of success.");
- return;
- }
- control_event_server_status(LOG_NOTICE,
- "REACHABILITY_SUCCEEDED ORADDRESS=%s:%d",
- me->address, me->or_port);
- }
- }
- /** Annotate that we found our DirPort reachable. */
- void
- router_dirport_found_reachable(void)
- {
- if (!can_reach_dir_port) {
- routerinfo_t *me = router_get_my_routerinfo();
- log_notice(LD_DIRSERV,"Self-testing indicates your DirPort is reachable "
- "from the outside. Excellent.");
- can_reach_dir_port = 1;
- if (!me || decide_to_advertise_dirport(get_options(), me->dir_port))
- mark_my_descriptor_dirty();
- if (!me) { /* should never happen */
- log_warn(LD_BUG, "DirPort found reachable, but I have no routerinfo "
- "yet. Failing to inform controller of success.");
- return;
- }
- control_event_server_status(LOG_NOTICE,
- "REACHABILITY_SUCCEEDED DIRADDRESS=%s:%d",
- me->address, me->dir_port);
- }
- }
- /** We have enough testing circuits open. Send a bunch of "drop"
- * cells down each of them, to exercise our bandwidth. */
- void
- router_perform_bandwidth_test(int num_circs, time_t now)
- {
- int num_cells = (int)(get_options()->BandwidthRate * 10 / CELL_NETWORK_SIZE);
- int max_cells = num_cells < CIRCWINDOW_START ?
- num_cells : CIRCWINDOW_START;
- int cells_per_circuit = max_cells / num_circs;
- origin_circuit_t *circ = NULL;
- log_notice(LD_OR,"Performing bandwidth self-test...done.");
- while ((circ = circuit_get_next_by_pk_and_purpose(circ, NULL,
- CIRCUIT_PURPOSE_TESTING))) {
- /* dump cells_per_circuit drop cells onto this circ */
- int i = cells_per_circuit;
- if (circ->_base.state != CIRCUIT_STATE_OPEN)
- continue;
- circ->_base.timestamp_dirty = now;
- while (i-- > 0) {
- if (relay_send_command_from_edge(0, TO_CIRCUIT(circ),
- RELAY_COMMAND_DROP,
- NULL, 0, circ->cpath->prev)<0) {
- return; /* stop if error */
- }
- }
- }
- }
- /** Return true iff we believe ourselves to be an authoritative
- * directory server.
- */
- int
- authdir_mode(or_options_t *options)
- {
- return options->AuthoritativeDir != 0;
- }
- /** Return true iff we believe ourselves to be a v1 authoritative
- * directory server.
- */
- int
- authdir_mode_v1(or_options_t *options)
- {
- return authdir_mode(options) && options->V1AuthoritativeDir != 0;
- }
- /** Return true iff we believe ourselves to be a v2 authoritative
- * directory server.
- */
- int
- authdir_mode_v2(or_options_t *options)
- {
- return authdir_mode(options) && options->V2AuthoritativeDir != 0;
- }
- /** Return true iff we believe ourselves to be a v3 authoritative
- * directory server.
- */
- int
- authdir_mode_v3(or_options_t *options)
- {
- return authdir_mode(options) && options->V3AuthoritativeDir != 0;
- }
- /** Return true iff we are a v1, v2, or v3 directory authority. */
- int
- authdir_mode_any_main(or_options_t *options)
- {
- return options->V1AuthoritativeDir ||
- options->V2AuthoritativeDir ||
- options->V3AuthoritativeDir;
- }
- /** Return true if we believe ourselves to be any kind of
- * authoritative directory beyond just a hidserv authority. */
- int
- authdir_mode_any_nonhidserv(or_options_t *options)
- {
- return options->BridgeAuthoritativeDir ||
- authdir_mode_any_main(options);
- }
- /** Return true iff we are an authoritative directory server that is
- * authoritative about receiving and serving descriptors of type
- * <b>purpose</b> its dirport. Use -1 for "any purpose". */
- int
- authdir_mode_handles_descs(or_options_t *options, int purpose)
- {
- if (purpose < 0)
- return authdir_mode_any_nonhidserv(options);
- else if (purpose == ROUTER_PURPOSE_GENERAL)
- return authdir_mode_any_main(options);
- else if (purpose == ROUTER_PURPOSE_BRIDGE)
- return (options->BridgeAuthoritativeDir);
- else
- return 0;
- }
- /** Return true iff we are an authoritative directory server that
- * publishes its own network statuses.
- */
- int
- authdir_mode_publishes_statuses(or_options_t *options)
- {
- if (authdir_mode_bridge(options))
- return 0;
- return authdir_mode_any_nonhidserv(options);
- }
- /** Return true iff we are an authoritative directory server that
- * tests reachability of the descriptors it learns about.
- */
- int
- authdir_mode_tests_reachability(or_options_t *options)
- {
- return authdir_mode_handles_descs(options, -1);
- }
- /** Return true iff we believe ourselves to be a bridge authoritative
- * directory server.
- */
- int
- authdir_mode_bridge(or_options_t *options)
- {
- return authdir_mode(options) && options->BridgeAuthoritativeDir != 0;
- }
- /** Return true iff we once tried to stay connected to all ORs at once.
- * FFFF this function, and the notion of staying connected to ORs, is
- * nearly obsolete. One day there will be a proposal for getting rid of
- * it.
- */
- int
- clique_mode(or_options_t *options)
- {
- return authdir_mode_tests_reachability(options);
- }
- /** Return true iff we are trying to be a server.
- */
- int
- server_mode(or_options_t *options)
- {
- if (options->ClientOnly) return 0;
- return (options->ORPort != 0 || options->ORListenAddress);
- }
- /** Remember if we've advertised ourselves to the dirservers. */
- static int server_is_advertised=0;
- /** Return true iff we have published our descriptor lately.
- */
- int
- advertised_server_mode(void)
- {
- return server_is_advertised;
- }
- /**
- * Called with a boolean: set whether we have recently published our
- * descriptor.
- */
- static void
- set_server_advertised(int s)
- {
- server_is_advertised = s;
- }
- /** Return true iff we are trying to be a socks proxy. */
- int
- proxy_mode(or_options_t *options)
- {
- return (options->SocksPort != 0 || options->SocksListenAddress ||
- options->TransPort != 0 || options->TransListenAddress ||
- options->NatdPort != 0 || options->NatdListenAddress ||
- options->DNSPort != 0 || options->DNSListenAddress);
- }
- /** Decide if we're a publishable server. We are a publishable server if:
- * - We don't have the ClientOnly option set
- * and
- * - We have the PublishServerDescriptor option set to non-empty
- * and
- * - We have ORPort set
- * and
- * - We believe we are reachable from the outside; or
- * - We are an authoritative directory server.
- */
- static int
- decide_if_publishable_server(void)
- {
- or_options_t *options = get_options();
- if (options->ClientOnly)
- return 0;
- if (options->_PublishServerDescriptor == NO_AUTHORITY)
- return 0;
- if (!server_mode(options))
- return 0;
- if (authdir_mode(options))
- return 1;
- return check_whether_orport_reachable();
- }
- /** Initiate server descriptor upload as reasonable (if server is publishable,
- * etc). <b>force</b> is as for router_upload_dir_desc_to_dirservers.
- *
- * We need to rebuild the descriptor if it's dirty even if we're not
- * uploading, because our reachability testing *uses* our descriptor to
- * determine what IP address and ports to test.
- */
- void
- consider_publishable_server(int force)
- {
- int rebuilt;
- if (!server_mode(get_options()))
- return;
- rebuilt = router_rebuild_descriptor(0);
- if (decide_if_publishable_server()) {
- set_server_advertised(1);
- if (rebuilt == 0)
- router_upload_dir_desc_to_dirservers(force);
- } else {
- set_server_advertised(0);
- }
- }
- /*
- * Clique maintenance -- to be phased out.
- */
- /** Return true iff we believe this OR tries to keep connections open
- * to all other ORs. */
- int
- router_is_clique_mode(routerinfo_t *router)
- {
- if (router_digest_is_trusted_dir(router->cache_info.identity_digest))
- return 1;
- return 0;
- }
- /*
- * OR descriptor generation.
- */
- /** My routerinfo. */
- static routerinfo_t *desc_routerinfo = NULL;
- /** My extrainfo */
- static extrainfo_t *desc_extrainfo = NULL;
- /** Since when has our descriptor been "clean"? 0 if we need to regenerate it
- * now. */
- static time_t desc_clean_since = 0;
- /** Boolean: do we need to regenerate the above? */
- static int desc_needs_upload = 0;
- /** OR only: If <b>force</b> is true, or we haven't uploaded this
- * descriptor successfully yet, try to upload our signed descriptor to
- * all the directory servers we know about.
- */
- void
- router_upload_dir_desc_to_dirservers(int force)
- {
- routerinfo_t *ri;
- extrainfo_t *ei;
- char *msg;
- size_t desc_len, extra_len = 0, total_len;
- authority_type_t auth = get_options()->_PublishServerDescriptor;
- ri = router_get_my_routerinfo();
- if (!ri) {
- log_info(LD_GENERAL, "No descriptor; skipping upload");
- return;
- }
- ei = router_get_my_extrainfo();
- if (auth == NO_AUTHORITY)
- return;
- if (!force && !desc_needs_upload)
- return;
- desc_needs_upload = 0;
- desc_len = ri->cache_info.signed_descriptor_len;
- extra_len = ei ? ei->cache_info.signed_descriptor_len : 0;
- total_len = desc_len + extra_len + 1;
- msg = tor_malloc(total_len);
- memcpy(msg, ri->cache_info.signed_descriptor_body, desc_len);
- if (ei) {
- memcpy(msg+desc_len, ei->cache_info.signed_descriptor_body, extra_len);
- }
- msg[desc_len+extra_len] = 0;
- directory_post_to_dirservers(DIR_PURPOSE_UPLOAD_DIR,
- (auth & BRIDGE_AUTHORITY) ?
- ROUTER_PURPOSE_BRIDGE :
- ROUTER_PURPOSE_GENERAL,
- auth, msg, desc_len, extra_len);
- tor_free(msg);
- }
- /** OR only: Check whether my exit policy says to allow connection to
- * conn. Return 0 if we accept; non-0 if we reject.
- */
- int
- router_compare_to_my_exit_policy(edge_connection_t *conn)
- {
- if (!router_get_my_routerinfo()) /* make sure desc_routerinfo exists */
- return -1;
- /* make sure it's resolved to something. this way we can't get a
- 'maybe' below. */
- if (tor_addr_is_null(&conn->_base.addr))
- return -1;
- /* XXXX IPv6 */
- if (tor_addr_family(&conn->_base.addr) != AF_INET)
- return -1;
- return compare_tor_addr_to_addr_policy(&conn->_base.addr, conn->_base.port,
- desc_routerinfo->exit_policy) != ADDR_POLICY_ACCEPTED;
- }
- /** Return true iff I'm a server and <b>digest</b> is equal to
- * my identity digest. */
- int
- router_digest_is_me(const char *digest)
- {
- return identitykey && !memcmp(identitykey_digest, digest, DIGEST_LEN);
- }
- /** Return true iff I'm a server and <b>digest</b> is equal to
- * my identity digest. */
- int
- router_extrainfo_digest_is_me(const char *digest)
- {
- extrainfo_t *ei = router_get_my_extrainfo();
- if (!ei)
- return 0;
- return !memcmp(digest,
- ei->cache_info.signed_descriptor_digest,
- DIGEST_LEN);
- }
- /** A wrapper around router_digest_is_me(). */
- int
- router_is_me(routerinfo_t *router)
- {
- return router_digest_is_me(router->cache_info.identity_digest);
- }
- /** Return true iff <b>fp</b> is a hex fingerprint of my identity digest. */
- int
- router_fingerprint_is_me(const char *fp)
- {
- char digest[DIGEST_LEN];
- if (strlen(fp) == HEX_DIGEST_LEN &&
- base16_decode(digest, sizeof(digest), fp, HEX_DIGEST_LEN) == 0)
- return router_digest_is_me(digest);
- return 0;
- }
- /** Return a routerinfo for this OR, rebuilding a fresh one if
- * necessary. Return NULL on error, or if called on an OP. */
- routerinfo_t *
- router_get_my_routerinfo(void)
- {
- if (!server_mode(get_options()))
- return NULL;
- if (router_rebuild_descriptor(0))
- return NULL;
- return desc_routerinfo;
- }
- /** OR only: Return a signed server descriptor for this OR, rebuilding a fresh
- * one if necessary. Return NULL on error.
- */
- const char *
- router_get_my_descriptor(void)
- {
- const char *body;
- if (!router_get_my_routerinfo())
- return NULL;
- /* Make sure this is nul-terminated. */
- tor_assert(desc_routerinfo->cache_info.saved_location == SAVED_NOWHERE);
- body = signed_descriptor_get_body(&desc_routerinfo->cache_info);
- tor_assert(!body[desc_routerinfo->cache_info.signed_descriptor_len]);
- log_debug(LD_GENERAL,"my desc is '%s'", body);
- return body;
- }
- /** Return the extrainfo document for this OR, or NULL if we have none.
- * Rebuilt it (and the server descriptor) if necessary. */
- extrainfo_t *
- router_get_my_extrainfo(void)
- {
- if (!server_mode(get_options()))
- return NULL;
- if (router_rebuild_descriptor(0))
- return NULL;
- return desc_extrainfo;
- }
- /** A list of nicknames that we've warned about including in our family
- * declaration verbatim rather than as digests. */
- static smartlist_t *warned_nonexistent_family = NULL;
- static int router_guess_address_from_dir_headers(uint32_t *guess);
- /** Make a current best guess at our address, either because
- * it's configured in torrc, or because we've learned it from
- * dirserver headers. Place the answer in *<b>addr</b> and return
- * 0 on success, else return -1 if we have no guess. */
- int
- router_pick_published_address(or_options_t *options, uint32_t *addr)
- {
- if (resolve_my_address(LOG_INFO, options, addr, NULL) < 0) {
- log_info(LD_CONFIG, "Could not determine our address locally. "
- "Checking if directory headers provide any hints.");
- if (router_guess_address_from_dir_headers(addr) < 0) {
- log_info(LD_CONFIG, "No hints from directory headers either. "
- "Will try again later.");
- return -1;
- }
- }
- return 0;
- }
- /** If <b>force</b> is true, or our descriptor is out-of-date, rebuild a fresh
- * routerinfo, signed server descriptor, and extra-info document for this OR.
- * Return 0 on success, -1 on temporary error.
- */
- int
- router_rebuild_descriptor(int force)
- {
- routerinfo_t *ri;
- extrainfo_t *ei;
- uint32_t addr;
- char platform[256];
- int hibernating = we_are_hibernating();
- or_options_t *options = get_options();
- if (desc_clean_since && !force)
- return 0;
- if (router_pick_published_address(options, &addr) < 0) {
- /* Stop trying to rebuild our descriptor every second. We'll
- * learn that it's time to try again when server_has_changed_ip()
- * marks it dirty. */
- desc_clean_since = time(NULL);
- return -1;
- }
- ri = tor_malloc_zero(sizeof(routerinfo_t));
- ri->cache_info.routerlist_index = -1;
- ri->address = tor_dup_ip(addr);
- ri->nickname = tor_strdup(options->Nickname);
- ri->addr = addr;
- ri->or_port = options->ORPort;
- ri->dir_port = options->DirPort;
- ri->cache_info.published_on = time(NULL);
- ri->onion_pkey = crypto_pk_dup_key(get_onion_key()); /* must invoke from
- * main thread */
- ri->identity_pkey = crypto_pk_dup_key(get_identity_key());
- if (crypto_pk_get_digest(ri->identity_pkey,
- ri->cache_info.identity_digest)<0) {
- routerinfo_free(ri);
- return -1;
- }
- get_platform_str(platform, sizeof(platform));
- ri->platform = tor_strdup(platform);
- /* compute ri->bandwidthrate as the min of various options */
- ri->bandwidthrate = get_effective_bwrate(options);
- /* and compute ri->bandwidthburst similarly */
- ri->bandwidthburst = get_effective_bwburst(options);
- ri->bandwidthcapacity = hibernating ? 0 : rep_hist_bandwidth_assess();
- policies_parse_exit_policy(options->ExitPolicy, &ri->exit_policy,
- options->ExitPolicyRejectPrivate,
- ri->address);
- if (desc_routerinfo) { /* inherit values */
- ri->is_valid = desc_routerinfo->is_valid;
- ri->is_running = desc_routerinfo->is_running;
- ri->is_named = desc_routerinfo->is_named;
- }
- if (authdir_mode(options))
- ri->is_valid = ri->is_named = 1; /* believe in yourself */
- if (options->MyFamily) {
- smartlist_t *family;
- if (!warned_nonexistent_family)
- warned_nonexistent_family = smartlist_create();
- family = smartlist_create();
- ri->declared_family = smartlist_create();
- smartlist_split_string(family, options->MyFamily, ",",
- SPLIT_SKIP_SPACE|SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0);
- SMARTLIST_FOREACH(family, char *, name,
- {
- routerinfo_t *member;
- if (!strcasecmp(name, options->Nickname))
- member = ri;
- else
- member = router_get_by_nickname(name, 1);
- if (!member) {
- int is_legal = is_legal_nickname_or_hexdigest(name);
- if (!smartlist_string_isin(warned_nonexistent_family, name) &&
- !is_legal_hexdigest(name)) {
- if (is_legal)
- log_warn(LD_CONFIG,
- "I have no descriptor for the router named "%s" in my "
- "declared family; I'll use the nickname as is, but "
- "this may confuse clients.", name);
- else
- log_warn(LD_CONFIG, "There is a router named "%s" in my "
- "declared family, but that isn't a legal nickname. "
- "Skipping it.", escaped(name));
- smartlist_add(warned_nonexistent_family, tor_strdup(name));
- }
- if (is_legal) {
- smartlist_add(ri->declared_family, name);
- name = NULL;
- }
- } else if (router_is_me(member)) {
- /* Don't list ourself in our own family; that's redundant */
- } else {
- char *fp = tor_malloc(HEX_DIGEST_LEN+2);
- fp[0] = '$';
- base16_encode(fp+1,HEX_DIGEST_LEN+1,
- member->cache_info.identity_digest, DIGEST_LEN);
- smartlist_add(ri->declared_family, fp);
- if (smartlist_string_isin(warned_nonexistent_family, name))
- smartlist_string_remove(warned_nonexistent_family, name);
- }
- tor_free(name);
- });
- /* remove duplicates from the list */
- smartlist_sort_strings(ri->declared_family);
- smartlist_uniq_strings(ri->declared_family);
- smartlist_free(family);
- }
- /* Now generate the extrainfo. */
- ei = tor_malloc_zero(sizeof(extrainfo_t));
- ei->cache_info.is_extrainfo = 1;
- strlcpy(ei->nickname, get_options()->Nickname, sizeof(ei->nickname));
- ei->cache_info.published_on = ri->cache_info.published_on;
- memcpy(ei->cache_info.identity_digest, ri->cache_info.identity_digest,
- DIGEST_LEN);
- ei->cache_info.signed_descriptor_body = tor_malloc(8192);
- if (extrainfo_dump_to_string(ei->cache_info.signed_descriptor_body, 8192,
- ei, get_identity_key()) < 0) {
- log_warn(LD_BUG, "Couldn't generate extra-info descriptor.");
- extrainfo_free(ei);
- return -1;
- }
- ei->cache_info.signed_descriptor_len =
- strlen(ei->cache_info.signed_descriptor_body);
- router_get_extrainfo_hash(ei->cache_info.signed_descriptor_body,
- ei->cache_info.signed_descriptor_digest);
- /* Now finish the router descriptor. */
- memcpy(ri->cache_info.extra_info_digest,
- ei->cache_info.signed_descriptor_digest,
- DIGEST_LEN);
- ri->cache_info.signed_descriptor_body = tor_malloc(8192);
- if (router_dump_router_to_string(ri->cache_info.signed_descriptor_body, 8192,
- ri, get_identity_key())<0) {
- log_warn(LD_BUG, "Couldn't generate router descriptor.");
- return -1;
- }
- ri->cache_info.signed_descriptor_len =
- strlen(ri->cache_info.signed_descriptor_body);
- ri->purpose =
- options->BridgeRelay ? ROUTER_PURPOSE_BRIDGE : ROUTER_PURPOSE_GENERAL;
- ri->cache_info.send_unencrypted = 1;
- /* Let bridges serve their own descriptors unencrypted, so they can
- * pass reachability testing. (If they want to be harder to notice,
- * they can always leave the DirPort off). */
- if (!options->BridgeRelay)
- ei->cache_info.send_unencrypted = 1;
- router_get_router_hash(ri->cache_info.signed_descriptor_body,
- ri->cache_info.signed_descriptor_digest);
- routerinfo_set_country(ri);
- tor_assert(! routerinfo_incompatible_with_extrainfo(ri, ei, NULL, NULL));
- if (desc_routerinfo)
- routerinfo_free(desc_routerinfo);
- desc_routerinfo = ri;
- if (desc_extrainfo)
- extrainfo_free(desc_extrainfo);
- desc_extrainfo = ei;
- desc_clean_since = time(NULL);
- desc_needs_upload = 1;
- control_event_my_descriptor_changed();
- return 0;
- }
- /** Mark descriptor out of date if it's older than <b>when</b> */
- void
- mark_my_descriptor_dirty_if_older_than(time_t when)
- {
- if (desc_clean_since < when)
- mark_my_descriptor_dirty();
- }
- /** Call when the current descriptor is out of date. */
- void
- mark_my_descriptor_dirty(void)
- {
- desc_clean_since = 0;
- }
- /** How frequently will we republish our descriptor because of large (factor
- * of 2) shifts in estimated bandwidth? */
- #define MAX_BANDWIDTH_CHANGE_FREQ (20*60)
- /** Check whether bandwidth has changed a lot since the last time we announced
- * bandwidth. If so, mark our descriptor dirty. */
- void
- check_descriptor_bandwidth_changed(time_t now)
- {
- static time_t last_changed = 0;
- uint64_t prev, cur;
- if (!desc_routerinfo)
- return;
- prev = desc_routerinfo->bandwidthcapacity;
- cur = we_are_hibernating() ? 0 : rep_hist_bandwidth_assess();
- if ((prev != cur && (!prev || !cur)) ||
- cur > prev*2 ||
- cur < prev/2) {
- if (last_changed+MAX_BANDWIDTH_CHANGE_FREQ < now) {
- log_info(LD_GENERAL,
- "Measured bandwidth has changed; rebuilding descriptor.");
- mark_my_descriptor_dirty();
- last_changed = now;
- }
- }
- }
- /** Note at log level severity that our best guess of address has changed from
- * <b>prev</b> to <b>cur</b>. */
- static void
- log_addr_has_changed(int severity, uint32_t prev, uint32_t cur,
- const char *source)
- {
- char addrbuf_prev[INET_NTOA_BUF_LEN];
- char addrbuf_cur[INET_NTOA_BUF_LEN];
- struct in_addr in_prev;
- struct in_addr in_cur;
- in_prev.s_addr = htonl(prev);
- tor_inet_ntoa(&in_prev, addrbuf_prev, sizeof(addrbuf_prev));
- in_cur.s_addr = htonl(cur);
- tor_inet_ntoa(&in_cur, addrbuf_cur, sizeof(addrbuf_cur));
- if (prev)
- log_fn(severity, LD_GENERAL,
- "Our IP Address has changed from %s to %s; "
- "rebuilding descriptor (source: %s).",
- addrbuf_prev, addrbuf_cur, source);
- else
- log_notice(LD_GENERAL,
- "Guessed our IP address as %s (source: %s).",
- addrbuf_cur, source);
- }
- /** Check whether our own address as defined by the Address configuration
- * has changed. This is for routers that get their address from a service
- * like dyndns. If our address has changed, mark our descriptor dirty. */
- void
- check_descriptor_ipaddress_changed(time_t now)
- {
- uint32_t prev, cur;
- or_options_t *options = get_options();
- (void) now;
- if (!desc_routerinfo)
- return;
- prev = desc_routerinfo->addr;
- if (resolve_my_address(LOG_INFO, options, &cur, NULL) < 0) {
- log_info(LD_CONFIG,"options->Address didn't resolve into an IP.");
- return;
- }
- if (prev != cur) {
- log_addr_has_changed(LOG_NOTICE, prev, cur, "resolve");
- ip_address_changed(0);
- }
- }
- /** The most recently guessed value of our IP address, based on directory
- * headers. */
- static uint32_t last_guessed_ip = 0;
- /** A directory server <b>d_conn</b> told us our IP address is
- * <b>suggestion</b>.
- * If this address is different from the one we think we are now, and
- * if our computer doesn't actually know its IP address, then switch. */
- void
- router_new_address_suggestion(const char *suggestion,
- const dir_connection_t *d_conn)
- {
- uint32_t addr, cur = 0;
- struct in_addr in;
- or_options_t *options = get_options();
- /* first, learn what the IP address actually is */
- if (!tor_inet_aton(suggestion, &in)) {
- log_debug(LD_DIR, "Malformed X-Your-Address-Is header %s. Ignoring.",
- escaped(suggestion));
- return;
- }
- addr = ntohl(in.s_addr);
- log_debug(LD_DIR, "Got X-Your-Address-Is: %s.", suggestion);
- if (!server_mode(options)) {
- last_guessed_ip = addr; /* store it in case we need it later */
- return;
- }
- if (resolve_my_address(LOG_INFO, options, &cur, NULL) >= 0) {
- /* We're all set -- we already know our address. Great. */
- last_guessed_ip = cur; /* store it in case we need it later */
- return;
- }
- if (is_internal_IP(addr, 0)) {
- /* Don't believe anybody who says our IP is, say, 127.0.0.1. */
- return;
- }
- if (tor_addr_eq_ipv4h(&d_conn->_base.addr, addr)) {
- /* Don't believe anybody who says our IP is their IP. */
- log_debug(LD_DIR, "A directory server told us our IP address is %s, "
- "but he's just reporting his own IP address. Ignoring.",
- suggestion);
- return;
- }
- /* Okay. We can't resolve our own address, and X-Your-Address-Is is giving
- * us an answer different from what we had the last time we managed to
- * resolve it. */
- if (last_guessed_ip != addr) {
- control_event_server_status(LOG_NOTICE,
- "EXTERNAL_ADDRESS ADDRESS=%s METHOD=DIRSERV",
- suggestion);
- log_addr_has_changed(LOG_NOTICE, last_guessed_ip, addr,
- d_conn->_base.address);
- ip_address_changed(0);
- last_guessed_ip = addr; /* router_rebuild_descriptor() will fetch it */
- }
- }
- /** We failed to resolve our address locally, but we'd like to build
- * a descriptor and publish / test reachability. If we have a guess
- * about our address based on directory headers, answer it and return
- * 0; else return -1. */
- static int
- router_guess_address_from_dir_headers(uint32_t *guess)
- {
- if (last_guessed_ip) {
- *guess = last_guessed_ip;
- return 0;
- }
- return -1;
- }
- extern const char tor_svn_revision[]; /* from tor_main.c */
- /** Set <b>platform</b> (max length <b>len</b>) to a NUL-terminated short
- * string describing the version of Tor and the operating system we're
- * currently running on.
- */
- void
- get_platform_str(char *platform, size_t len)
- {
- tor_snprintf(platform, len, "Tor %s on %s", get_version(), get_uname());
- }
- /* XXX need to audit this thing and count fenceposts. maybe
- * refactor so we don't have to keep asking if we're
- * near the end of maxlen?
- */
- #define DEBUG_ROUTER_DUMP_ROUTER_TO_STRING
- /** OR only: Given a routerinfo for this router, and an identity key to sign
- * with, encode the routerinfo as a signed server descriptor and write the
- * result into <b>s</b>, using at most <b>maxlen</b> bytes. Return -1 on
- * failure, and the number of bytes used on success.
- */
- int
- router_dump_router_to_string(char *s, size_t maxlen, routerinfo_t *router,
- crypto_pk_env_t *ident_key)
- {
- char *onion_pkey; /* Onion key, PEM-encoded. */
- char *identity_pkey; /* Identity key, PEM-encoded. */
- char digest[DIGEST_LEN];
- char published[ISO_TIME_LEN+1];
- char fingerprint[FINGERPRINT_LEN+1];
- char extra_info_digest[HEX_DIGEST_LEN+1];
- size_t onion_pkeylen, identity_pkeylen;
- size_t written;
- int result=0;
- addr_policy_t *tmpe;
- char *family_line;
- or_options_t *options = get_options();
- /* Make sure the identity key matches the one in the routerinfo. */
- if (crypto_pk_cmp_keys(ident_key, router->identity_pkey)) {
- log_warn(LD_BUG,"Tried to sign a router with a private key that didn't "
- "match router's public key!");
- return -1;
- }
- /* record our fingerprint, so we can include it in the descriptor */
- if (crypto_pk_get_fingerprint(router->identity_pkey, fingerprint, 1)<0) {
- log_err(LD_BUG,"Error computing fingerprint");
- return -1;
- }
- /* PEM-encode the onion key */
- if (crypto_pk_write_public_key_to_string(router->onion_pkey,
- &onion_pkey,&onion_pkeylen)<0) {
- log_warn(LD_BUG,"write onion_pkey to string failed!");
- return -1;
- }
- /* PEM-encode the identity key key */
- if (crypto_pk_write_public_key_to_string(router->identity_pkey,
- &identity_pkey,&identity_pkeylen)<0) {
- log_warn(LD_BUG,"write identity_pkey to string failed!");
- tor_free(onion_pkey);
- return -1;
- }
- /* Encode the publication time. */
- format_iso_time(published, router->cache_info.published_on);
- if (router->declared_family && smartlist_len(router->declared_family)) {
- size_t n;
- char *family = smartlist_join_strings(router->declared_family, " ", 0, &n);
- n += strlen("family ") + 2; /* 1 for n, 1 for