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- /* Copyright 2001 Matej Pfajfar.
- * Copyright 2001-2004 Roger Dingledine.
- * Copyright 2004 Roger Dingledine, Nick Mathewson. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- const char routerparse_c_id[] = "$Id$";
- /**
- * \file routerparse.c
- *
- * \brief Code to parse and validate router descriptors and directories.
- **/
- #include "or.h"
- /****************************************************************************/
- /** Enumeration of possible token types. The ones starting with K_
- * correspond to directory 'keywords'. _UNRECOGNIZED is for an
- * unrecognized keyword; _ERR is an error in the tokenizing process,
- * _EOF is an end-of-file marker, and _NIL is used to encode
- * not-a-token.
- */
- typedef enum {
- K_ACCEPT,
- K_DIRECTORY_SIGNATURE,
- K_RECOMMENDED_SOFTWARE,
- K_REJECT,
- K_ROUTER,
- K_SIGNED_DIRECTORY,
- K_SIGNING_KEY,
- K_ONION_KEY,
- K_ROUTER_SIGNATURE,
- K_PUBLISHED,
- K_RUNNING_ROUTERS,
- K_ROUTER_STATUS,
- K_PLATFORM,
- K_OPT,
- K_BANDWIDTH,
- K_PORTS,
- K_DIRCACHEPORT,
- K_CONTACT,
- K_NETWORK_STATUS,
- K_UPTIME,
- K_DIR_SIGNING_KEY,
- K_FAMILY,
- _UNRECOGNIZED,
- _ERR,
- _EOF,
- _NIL
- } directory_keyword;
- /** Structure to hold a single directory token.
- *
- * We parse a directory by breaking it into "tokens", each consisting
- * of a keyword, a line full of arguments, and a binary object. The
- * arguments and object are both optional, depending on the keyword
- * type.
- */
- typedef struct directory_token_t {
- directory_keyword tp; /**< Type of the token. */
- int n_args; /**< Number of elements in args */
- char **args; /**< Array of arguments from keyword line. */
- char *object_type; /**< -----BEGIN [object_type]-----*/
- size_t object_size; /**< Bytes in object_body */
- char *object_body; /**< Contents of object, base64-decoded. */
- crypto_pk_env_t *key; /**< For public keys only. */
- const char *error; /**< For _ERR tokens only. */
- } directory_token_t;
- /* ********************************************************************** */
- /** We use a table of rules to decide how to parse each token type. */
- /** Rules for how many arguments a keyword can take. */
- typedef enum {
- NO_ARGS, /**< (1) no arguments, ever */
- ARGS, /**< (2) a list of arguments separated by spaces */
- CONCAT_ARGS, /**< or (3) the rest of the line, treated as a single argument. */
- } arg_syntax;
- /** Rules for whether the keyword needs an object. */
- typedef enum {
- NO_OBJ, /**< (1) no object, ever */
- NEED_OBJ, /**< (2) object is required */
- NEED_KEY, /**< (3) object is required, and must be a public key. */
- OBJ_OK, /**< or (4) object is optional. */
- } obj_syntax;
- /** Rules for where a keyword can appear. */
- typedef enum {
- ANY = 0, /**< Appears in router descriptor or in directory sections. */
- DIR_ONLY, /**< Appears only in directory. */
- RTR_ONLY, /**< Appears only in router descriptor or runningrouters */
- } where_syntax;
- /** Table mapping keywords to token value and to argument rules. */
- static struct {
- const char *t; int v; arg_syntax s; obj_syntax os; where_syntax ws;
- } token_table[] = {
- { "accept", K_ACCEPT, ARGS, NO_OBJ, RTR_ONLY },
- { "directory-signature", K_DIRECTORY_SIGNATURE, ARGS, NEED_OBJ,DIR_ONLY},
- { "reject", K_REJECT, ARGS, NO_OBJ, RTR_ONLY },
- { "router", K_ROUTER, ARGS, NO_OBJ, RTR_ONLY },
- { "recommended-software",K_RECOMMENDED_SOFTWARE,ARGS, NO_OBJ, DIR_ONLY },
- { "signed-directory", K_SIGNED_DIRECTORY, NO_ARGS, NO_OBJ, DIR_ONLY },
- { "signing-key", K_SIGNING_KEY, NO_ARGS, NEED_KEY,RTR_ONLY },
- { "onion-key", K_ONION_KEY, NO_ARGS, NEED_KEY,RTR_ONLY },
- { "router-signature", K_ROUTER_SIGNATURE, NO_ARGS, NEED_OBJ,RTR_ONLY },
- { "running-routers", K_RUNNING_ROUTERS, ARGS, NO_OBJ, DIR_ONLY },
- { "router-status", K_ROUTER_STATUS, ARGS, NO_OBJ, DIR_ONLY },
- { "ports", K_PORTS, ARGS, NO_OBJ, RTR_ONLY },
- { "bandwidth", K_BANDWIDTH, ARGS, NO_OBJ, RTR_ONLY },
- { "platform", K_PLATFORM, CONCAT_ARGS, NO_OBJ, RTR_ONLY },
- { "published", K_PUBLISHED, CONCAT_ARGS, NO_OBJ, ANY },
- { "opt", K_OPT, CONCAT_ARGS, OBJ_OK, ANY },
- { "dircacheport", K_DIRCACHEPORT, ARGS, NO_OBJ, RTR_ONLY },
- { "contact", K_CONTACT, CONCAT_ARGS, NO_OBJ, ANY },
- { "network-status", K_NETWORK_STATUS, NO_ARGS, NO_OBJ, DIR_ONLY },
- { "uptime", K_UPTIME, ARGS, NO_OBJ, RTR_ONLY },
- { "dir-signing-key", K_DIR_SIGNING_KEY, ARGS, OBJ_OK, DIR_ONLY },
- { "family", K_FAMILY, ARGS, NO_OBJ, RTR_ONLY },
- { NULL, -1, NO_ARGS, NO_OBJ, ANY }
- };
- /* static function prototypes */
- static int router_add_exit_policy(routerinfo_t *router,directory_token_t *tok);
- static addr_policy_t *router_parse_addr_policy(directory_token_t *tok);
- static int router_get_hash_impl(const char *s, char *digest,
- const char *start_str, const char *end_str);
- static void token_free(directory_token_t *tok);
- static smartlist_t *find_all_exitpolicy(smartlist_t *s);
- static directory_token_t *find_first_by_keyword(smartlist_t *s,
- directory_keyword keyword);
- static int tokenize_string(const char *start, const char *end,
- smartlist_t *out, int is_dir);
- static directory_token_t *get_next_token(const char **s, where_syntax where);
- static int check_directory_signature(const char *digest,
- directory_token_t *tok,
- crypto_pk_env_t *pkey,
- crypto_pk_env_t *declared_key);
- static crypto_pk_env_t *find_dir_signing_key(const char *str);
- /* static */ int is_obsolete_version(const char *myversion,
- const char *versionlist);
- /** Set <b>digest</b> to the SHA-1 digest of the hash of the directory in
- * <b>s</b>. Return 0 on success, nonzero on failure.
- */
- int router_get_dir_hash(const char *s, char *digest)
- {
- return router_get_hash_impl(s,digest,
- "signed-directory","\ndirectory-signature");
- }
- /** Set <b>digest</b> to the SHA-1 digest of the hash of the first router in
- * <b>s</b>. Return 0 on success, nonzero on failure.
- */
- int router_get_router_hash(const char *s, char *digest)
- {
- return router_get_hash_impl(s,digest,
- "router ","\nrouter-signature");
- }
- /** Set <b>digest</b> to the SHA-1 digest of the hash of the running-routers
- * string in <b>s</b>. Return 0 on success, nonzero on failure.
- */
- int router_get_runningrouters_hash(const char *s, char *digest)
- {
- return router_get_hash_impl(s,digest,
- "network-status","\ndirectory-signature");
- }
- /**
- * Find the first instance of "recommended-software ...\n" at the start of
- * a line; return a newly allocated string containing the "..." portion.
- * Return NULL if no such instance was found.
- */
- static char *
- get_recommended_software_from_directory(const char *str)
- {
- #define REC "recommended-software "
- const char *cp = str, *eol;
- size_t len = strlen(REC);
- cp = str;
- if (strcmpstart(str, REC)==0) {
- cp += len;
- } else {
- cp = strstr(str, "\n"REC);
- if (!cp)
- return NULL;
- cp += len+1;
- }
- eol = strchr(cp, '\n');
- if (!eol)
- return NULL;
- return tor_strndup(cp, eol-cp);
- #undef REC
- }
- /** Return 1 if <b>myversion</b> is not in <b>versionlist</b>, and if at least
- * one version of Tor on <b>versionlist</b> is newer than <b>myversion</b>.
- * Otherwise return 0.
- * (versionlist is a comma-separated list of version strings,
- * optionally prefixed with "Tor". Versions that can't be parsed are
- * ignored.) */
- /* static */ int is_obsolete_version(const char *myversion,
- const char *versionlist) {
- const char *vl;
- tor_version_t mine, other;
- int found_newer = 0, r, ret;
- static int warned_too_new=0;
- smartlist_t *version_sl;
- vl = versionlist;
- log_fn(LOG_DEBUG,"Checking whether version '%s' is in '%s'", myversion, versionlist);
- if (tor_version_parse(myversion, &mine)) {
- log_fn(LOG_ERR, "I couldn't parse my own version (%s)", myversion);
- tor_assert(0);
- }
- version_sl = smartlist_create();
- smartlist_split_string(version_sl, versionlist, ",", SPLIT_SKIP_SPACE, 0);
- SMARTLIST_FOREACH(version_sl, const char *, cp, {
- if (!strcmpstart(cp, "Tor "))
- cp += 4;
- if (tor_version_parse(cp, &other)) {
- /* Couldn't parse other; it can't be a match. */
- } else {
- r = tor_version_compare(&mine, &other);
- if (r==0) {
- ret = 0;
- goto done;
- } else if (r<0) {
- found_newer = 1;
- }
- }
- });
- if (!found_newer) {
- if (!warned_too_new) {
- log(LOG_WARN, "This version of Tor (%s) is newer than any on the recommended list (%s)",
- myversion, versionlist);
- warned_too_new=1;
- }
- ret = 0;
- } else {
- ret = 1;
- }
- done:
- SMARTLIST_FOREACH(version_sl, char *, version, tor_free(version));
- smartlist_free(version_sl);
- return ret;
- }
- /* Return 0 if myversion is supported; else log a message and return
- * -1 (or exit if ignoreversions is false) */
- int check_software_version_against_directory(const char *directory,
- int ignoreversion)
- {
- char *v;
- v = get_recommended_software_from_directory(directory);
- if (!v) {
- log_fn(LOG_WARN, "No recommended-versions string found in directory");
- return -1;
- }
- if (!is_obsolete_version(VERSION, v)) {
- tor_free(v);
- return 0;
- }
- log(ignoreversion ? LOG_WARN : LOG_ERR,
- "You are running Tor version %s, which will not work with this network.\n"
- "Please use %s%s.",
- VERSION, strchr(v,',') ? "one of " : "", v);
- tor_free(v);
- if (ignoreversion) {
- log(LOG_WARN, "IgnoreVersion is set. If it breaks, we told you so.");
- return -1;
- } else {
- fflush(0);
- tor_cleanup();
- exit(0);
- return -1; /* never reached */
- }
- }
- /** Parse a directory from <b>str</b> and, when done, store the
- * resulting routerlist in *<b>dest</b>, freeing the old value if necessary.
- * If <b>pkey</b> is provided, we check the directory signature with pkey.
- */
- int /* Should be static; exposed for unit tests */
- router_parse_routerlist_from_directory(const char *str,
- routerlist_t **dest,
- crypto_pk_env_t *pkey,
- int check_version)
- {
- directory_token_t *tok;
- char digest[DIGEST_LEN];
- routerlist_t *new_dir = NULL;
- char *versions = NULL;
- smartlist_t *good_nickname_list = NULL;
- time_t published_on;
- int i, r;
- const char *end, *cp;
- smartlist_t *tokens = NULL;
- char dirnickname[MAX_NICKNAME_LEN+1];
- crypto_pk_env_t *declared_key = NULL;
- if (router_get_dir_hash(str, digest)) {
- log_fn(LOG_WARN, "Unable to compute digest of directory");
- goto err;
- }
- log_fn(LOG_DEBUG,"Received directory hashes to %s",hex_str(digest,4));
- /* Check signature first, before we try to tokenize. */
- cp = str;
- while (cp && (end = strstr(cp+1, "\ndirectory-signature")))
- cp = end;
- if (cp == str || !cp) {
- log_fn(LOG_WARN, "No signature found on directory."); goto err;
- }
- ++cp;
- tokens = smartlist_create();
- if (tokenize_string(cp,strchr(cp,'\0'),tokens,1)) {
- log_fn(LOG_WARN, "Error tokenizing directory signature"); goto err;
- }
- if (smartlist_len(tokens) != 1) {
- log_fn(LOG_WARN, "Unexpected number of tokens in signature"); goto err;
- }
- tok=smartlist_get(tokens,0);
- if (tok->tp != K_DIRECTORY_SIGNATURE) {
- log_fn(LOG_WARN,"Expected a single directory signature"); goto err;
- }
- declared_key = find_dir_signing_key(str);
- if (check_directory_signature(digest, tok, pkey, declared_key)<0)
- goto err;
- /* now we know tok->n_args == 1, so it's safe to access tok->args[0] */
- if (!is_legal_nickname(tok->args[0])) {
- log_fn(LOG_WARN, "Directory nickname '%s' is misformed", tok->args[0]);
- goto err;
- }
- strlcpy(dirnickname, tok->args[0], sizeof(dirnickname));
- SMARTLIST_FOREACH(tokens, directory_token_t *, tok, token_free(tok));
- smartlist_free(tokens);
- tokens = NULL;
- /* Now that we know the signature is okay, check the version. */
- if (check_version)
- check_software_version_against_directory(str, get_options()->IgnoreVersion);
- /* Now try to parse the first part of the directory. */
- if ((end = strstr(str,"\nrouter "))) {
- ++end;
- } else if ((end = strstr(str, "\ndirectory-signature"))) {
- ++end;
- } else {
- end = str + strlen(str);
- }
- tokens = smartlist_create();
- if (tokenize_string(str,end,tokens,1)) {
- log_fn(LOG_WARN, "Error tokenizing directory"); goto err;
- }
- if (smartlist_len(tokens) < 1) {
- log_fn(LOG_WARN, "Impossibly short directory header"); goto err;
- }
- if ((tok = find_first_by_keyword(tokens, _UNRECOGNIZED))) {
- log_fn(LOG_WARN, "Unrecognized keyword \"%s\" in directory header; can't parse directory.",
- tok->args[0]);
- goto err;
- }
- tok = smartlist_get(tokens,0);
- if (tok->tp != K_SIGNED_DIRECTORY) {
- log_fn(LOG_WARN, "Directory doesn't start with signed-directory.");
- goto err;
- }
- if (!(tok = find_first_by_keyword(tokens, K_PUBLISHED))) {
- log_fn(LOG_WARN, "Missing published time on directory.");
- goto err;
- }
- tor_assert(tok->n_args == 1);
- if (parse_iso_time(tok->args[0], &published_on) < 0) {
- goto err;
- }
- /* Now that we know the signature is okay, and we have a
- * publication time, cache the directory. */
- if (!get_options()->AuthoritativeDir)
- dirserv_set_cached_directory(str, published_on, 0);
- if (!(tok = find_first_by_keyword(tokens, K_RECOMMENDED_SOFTWARE))) {
- log_fn(LOG_WARN, "Missing recommended-software line from directory.");
- goto err;
- }
- if (tok->n_args > 1) {
- log_fn(LOG_WARN, "Invalid recommended-software line");
- goto err;
- }
- versions = tok->n_args ? tor_strdup(tok->args[0]) : tor_strdup("");
- /* Prefer router-status, then running-routers. */
- if (!(tok = find_first_by_keyword(tokens, K_ROUTER_STATUS))) {
- if (!(tok = find_first_by_keyword(tokens, K_RUNNING_ROUTERS))) {
- log_fn(LOG_WARN,
- "Missing running-routers/router-status line from directory.");
- goto err;
- }
- }
- good_nickname_list = smartlist_create();
- for (i=0; i<tok->n_args; ++i) {
- smartlist_add(good_nickname_list, tok->args[i]);
- }
- tok->n_args = 0; /* Don't free the strings in good_nickname_list yet. */
- /* Read the router list from s, advancing s up past the end of the last
- * router. */
- str = end;
- if (router_parse_list_from_string(&str, &new_dir,
- good_nickname_list,
- tok->tp==K_RUNNING_ROUTERS,
- published_on)) {
- log_fn(LOG_WARN, "Error reading routers from directory");
- goto err;
- }
- /* Determine if my routerinfo is considered verified. */
- {
- static int have_warned_about_unverified_status = 0;
- routerinfo_t *me = router_get_my_routerinfo();
- if (me) {
- if (router_update_status_from_smartlist(me,
- published_on, good_nickname_list, tok->tp==K_RUNNING_ROUTERS)==1 &&
- me->is_verified == 0 && !have_warned_about_unverified_status) {
- log_fn(LOG_WARN,"Dirserver '%s' lists your server as unverified. Please consider sending your identity fingerprint to the tor-ops.", dirnickname);
- have_warned_about_unverified_status = 1;
- }
- }
- }
- new_dir->software_versions = versions; versions = NULL;
- new_dir->published_on = published_on;
- SMARTLIST_FOREACH(tokens, directory_token_t *, tok, token_free(tok));
- smartlist_free(tokens);
- tokens = NULL;
- if (*dest)
- routerlist_free(*dest);
- *dest = new_dir;
- r = 0;
- goto done;
- err:
- r = -1;
- if (new_dir)
- routerlist_free(new_dir);
- tor_free(versions);
- done:
- if (declared_key) crypto_free_pk_env(declared_key);
- if (tokens) {
- SMARTLIST_FOREACH(tokens, directory_token_t *, tok, token_free(tok));
- smartlist_free(tokens);
- }
- if (good_nickname_list) {
- SMARTLIST_FOREACH(good_nickname_list, char *, n, tor_free(n));
- smartlist_free(good_nickname_list);
- }
- return r;
- }
- /* DOCDOC */
- running_routers_t *
- router_parse_runningrouters(const char *str)
- {
- char digest[DIGEST_LEN];
- running_routers_t *new_list = NULL;
- directory_token_t *tok;
- time_t published_on;
- int i;
- crypto_pk_env_t *declared_key = NULL;
- smartlist_t *tokens = NULL;
- if (router_get_runningrouters_hash(str, digest)) {
- log_fn(LOG_WARN, "Unable to compute digest of directory");
- goto err;
- }
- tokens = smartlist_create();
- if (tokenize_string(str,str+strlen(str),tokens,1)) {
- log_fn(LOG_WARN, "Error tokenizing directory"); goto err;
- }
- if ((tok = find_first_by_keyword(tokens, _UNRECOGNIZED))) {
- log_fn(LOG_WARN, "Unrecognized keyword '%s'; can't parse running-routers",
- tok->args[0]);
- goto err;
- }
- tok = smartlist_get(tokens,0);
- if (tok->tp != K_NETWORK_STATUS) {
- log_fn(LOG_WARN, "Network-status starts with wrong token");
- goto err;
- }
- if (!(tok = find_first_by_keyword(tokens, K_PUBLISHED))) {
- log_fn(LOG_WARN, "Missing published time on directory.");
- goto err;
- }
- tor_assert(tok->n_args == 1);
- if (parse_iso_time(tok->args[0], &published_on) < 0) {
- goto err;
- }
- /* Now that we know the signature is okay, and we have a
- * publication time, cache the list. */
- if (!get_options()->AuthoritativeDir)
- dirserv_set_cached_directory(str, published_on, 1);
- if (!(tok = find_first_by_keyword(tokens, K_ROUTER_STATUS))) {
- if (!(tok = find_first_by_keyword(tokens, K_RUNNING_ROUTERS))) {
- log_fn(LOG_WARN,
- "Missing running-routers/router-status line from directory.");
- goto err;
- }
- }
- new_list = tor_malloc_zero(sizeof(running_routers_t));
- new_list->published_on = published_on;
- new_list->running_routers = smartlist_create();
- new_list->is_running_routers_format = (tok->tp == K_RUNNING_ROUTERS);
- for (i=0;i<tok->n_args;++i) {
- smartlist_add(new_list->running_routers, tok->args[i]);
- }
- tok->n_args = 0; /* Don't free the elements of tok->args. */
- if (!(tok = find_first_by_keyword(tokens, K_DIRECTORY_SIGNATURE))) {
- log_fn(LOG_WARN, "Missing signature on running-routers");
- goto err;
- }
- declared_key = find_dir_signing_key(str);
- if (check_directory_signature(digest, tok, NULL, declared_key) < 0)
- goto err;
- goto done;
- err:
- if (new_list) {
- running_routers_free(new_list);
- new_list = NULL;
- }
- done:
- if (declared_key) crypto_free_pk_env(declared_key);
- if (tokens) {
- SMARTLIST_FOREACH(tokens, directory_token_t *, tok, token_free(tok));
- smartlist_free(tokens);
- }
- return new_list;
- }
- /** Given a directory or running-routers string in <b>str</b>, try to
- * find the its dir-signing-key token (if any). If this token is
- * present, extract and return the key. Return NULL on failure. */
- static crypto_pk_env_t *find_dir_signing_key(const char *str)
- {
- const char *cp;
- directory_token_t *tok;
- crypto_pk_env_t *key = NULL;
- /* Is there a dir-signing-key in the directory? */
- cp = strstr(str, "\nopt dir-signing-key");
- if (!cp)
- cp = strstr(str, "\ndir-signing-key");
- if (!cp)
- return NULL;
- ++cp; /* Now cp points to the start of the token. */
- tok = get_next_token(&cp, DIR_ONLY);
- if (!tok) {
- log_fn(LOG_WARN, "Unparseable dir-signing-key token");
- return NULL;
- }
- if (tok->tp != K_DIR_SIGNING_KEY) {
- log_fn(LOG_WARN, "Dir-signing-key token did not parse as expected");
- return NULL;
- }
- if (tok->key) {
- key = tok->key;
- tok->key = NULL; /* steal reference. */
- } else if (tok->n_args >= 1) {
- key = crypto_pk_DER64_decode_public_key(tok->args[0]);
- if (!key) {
- log_fn(LOG_WARN, "Unparseable dir-signing-key argument");
- return NULL;
- }
- } else {
- log_fn(LOG_WARN, "Dir-signing-key token contained no key");
- return NULL;
- }
- token_free(tok);
- return key;
- }
- /** Return true iff <b>key</b> is allowed to sign directories.
- */
- static int dir_signing_key_is_trusted(crypto_pk_env_t *key)
- {
- char digest[DIGEST_LEN];
- if (!key) return 0;
- if (crypto_pk_get_digest(key, digest) < 0) {
- log_fn(LOG_WARN, "Error computing dir-signing-key digest");
- return 0;
- }
- if (!router_digest_is_trusted_dir(digest)) {
- log_fn(LOG_WARN, "Listed dir-signing-key is not trusted");
- return 0;
- }
- return 1;
- }
- /** Check whether the K_DIRECTORY_SIGNATURE token in <b>tok</b> has a
- * good signature for <b>digest</b>.
- *
- * If <b>declared_key</b> is set, the directory has declared what key
- * was used to sign it, so we will use that key only if it is an
- * authoritative directory signing key.
- *
- * Otherwise, if pkey is provided, try to use it.
- *
- * (New callers should always use <b>declared_key</b> when possible;
- * <b>pkey is only for debugging.)
- */
- static int check_directory_signature(const char *digest,
- directory_token_t *tok,
- crypto_pk_env_t *pkey,
- crypto_pk_env_t *declared_key)
- {
- char signed_digest[PK_BYTES];
- crypto_pk_env_t *_pkey = NULL;
- if (tok->n_args != 1) {
- log_fn(LOG_WARN, "Too many or too few arguments to directory-signature");
- return -1;
- }
- if (declared_key) {
- if (dir_signing_key_is_trusted(declared_key))
- _pkey = declared_key;
- }
- if (!_pkey && pkey) {
- /* pkey provided for debugging purposes */
- _pkey = pkey;
- }
- if (!_pkey) {
- log_fn(LOG_WARN, "Found directory in old (before 0.0.9pre3) format--rejecting.");
- return -1;
- }
- if (strcmp(tok->object_type, "SIGNATURE") || tok->object_size != 128) {
- log_fn(LOG_WARN, "Bad object type or length on directory signature");
- return -1;
- }
- tor_assert(_pkey);
- if (crypto_pk_public_checksig(_pkey, signed_digest, tok->object_body, 128)
- != 20) {
- log_fn(LOG_WARN, "Error reading directory: invalid signature.");
- return -1;
- }
- log_fn(LOG_DEBUG,"Signed directory hash starts %s", hex_str(signed_digest,4));
- if (memcmp(digest, signed_digest, 20)) {
- log_fn(LOG_WARN, "Error reading directory: signature does not match.");
- return -1;
- }
- return 0;
- }
- /** Given a string *<b>s</b> containing a concatenated sequence of router
- * descriptors, parses them and stores the result in *<b>dest</b>. If
- * good_nickname_list is provided, then routers are marked as
- * running/nonrunning and verified/unverified based on their status in the
- * list. Otherwise, all routers are marked running and verified. Advances
- * *s to a point immediately following the last router entry. Returns 0 on
- * success and -1 on failure.
- */
- int
- router_parse_list_from_string(const char **s, routerlist_t **dest,
- smartlist_t *good_nickname_list,
- int rr_format, time_t published_on)
- {
- routerinfo_t *router;
- smartlist_t *routers;
- const char *end;
- tor_assert(s);
- tor_assert(*s);
- routers = smartlist_create();
- while (1) {
- *s = eat_whitespace(*s);
- /* Don't start parsing the rest of *s unless it contains a router. */
- if (strcmpstart(*s, "router ")!=0)
- break;
- if ((end = strstr(*s+1, "\nrouter "))) {
- end++;
- } else if ((end = strstr(*s+1, "\ndirectory-signature"))) {
- end++;
- } else {
- end = *s+strlen(*s);
- }
- router = router_parse_entry_from_string(*s, end);
- *s = end;
- if (!router) {
- log_fn(LOG_WARN, "Error reading router; skipping");
- continue;
- }
- if (!good_nickname_list) {
- router->is_running = 1; /* start out assuming all dirservers are up */
- router->is_verified = 1;
- router->status_set_at = time(NULL);
- }
- smartlist_add(routers, router);
- // log_fn(LOG_DEBUG,"just added router #%d.",smartlist_len(routers));
- }
- if (good_nickname_list) {
- SMARTLIST_FOREACH(good_nickname_list, const char *, cp,
- routers_update_status_from_entry(routers, published_on,
- cp, rr_format));
- }
- if (*dest)
- routerlist_free(*dest);
- *dest = tor_malloc_zero(sizeof(routerlist_t));
- (*dest)->routers = routers;
- return 0;
- }
- /** Helper function: reads a single router entry from *<b>s</b> ...
- * *<b>end</b>. Mallocs a new router and returns it if all goes well, else
- * returns NULL.
- */
- routerinfo_t *router_parse_entry_from_string(const char *s,
- const char *end) {
- routerinfo_t *router = NULL;
- char signed_digest[128];
- char digest[128];
- smartlist_t *tokens = NULL, *exit_policy_tokens = NULL;
- directory_token_t *tok;
- int t;
- int ports_set, bw_set;
- if (!end) {
- end = s + strlen(s);
- }
- if (router_get_router_hash(s, digest) < 0) {
- log_fn(LOG_WARN, "Couldn't compute router hash.");
- return NULL;
- }
- tokens = smartlist_create();
- if (tokenize_string(s,end,tokens,0)) {
- log_fn(LOG_WARN, "Error tokeninzing router descriptor."); goto err;
- }
- if (smartlist_len(tokens) < 2) {
- log_fn(LOG_WARN, "Impossibly short router descriptor.");
- goto err;
- }
- if ((tok = find_first_by_keyword(tokens, _UNRECOGNIZED))) {
- log_fn(LOG_WARN, "Unrecognized keyword '%s'; skipping descriptor.",
- tok->args[0]);
- goto err;
- }
- tok = smartlist_get(tokens,0);
- if (tok->tp != K_ROUTER) {
- log_fn(LOG_WARN,"Entry does not start with \"router\"");
- goto err;
- }
- router = tor_malloc_zero(sizeof(routerinfo_t));
- ports_set = bw_set = 0;
- if (tok->n_args == 2 || tok->n_args == 5 || tok->n_args == 6) {
- router->nickname = tor_strdup(tok->args[0]);
- if (!is_legal_nickname(router->nickname)) {
- log_fn(LOG_WARN,"Router nickname is invalid");
- goto err;
- }
- router->address = tor_strdup(tok->args[1]);
- router->addr = 0;
- if (tok->n_args >= 5) {
- router->or_port = (uint16_t) tor_parse_long(tok->args[2],10,0,65535,NULL,NULL);
- router->socks_port = (uint16_t) tor_parse_long(tok->args[3],10,0,65535,NULL,NULL);
- router->dir_port = (uint16_t) tor_parse_long(tok->args[4],10,0,65535,NULL,NULL);
- ports_set = 1;
- }
- } else {
- log_fn(LOG_WARN,"Wrong # of arguments to \"router\" (%d)",tok->n_args);
- goto err;
- }
- tok = find_first_by_keyword(tokens, K_PORTS);
- if (tok && ports_set) {
- log_fn(LOG_WARN,"Redundant ports line");
- goto err;
- } else if (tok) {
- if (tok->n_args != 3) {
- log_fn(LOG_WARN,"Wrong # of arguments to \"ports\"");
- goto err;
- }
- router->or_port = (uint16_t) tor_parse_long(tok->args[0],10,0,65535,NULL,NULL);
- router->socks_port = (uint16_t) tor_parse_long(tok->args[1],10,0,65535,NULL,NULL);
- router->dir_port = (uint16_t) tor_parse_long(tok->args[2],10,0,65535,NULL,NULL);
- ports_set = 1;
- }
- tok = find_first_by_keyword(tokens, K_DIRCACHEPORT);
- if (tok) {
- if (router->dir_port)
- log_fn(LOG_WARN,"Redundant dircacheport line");
- if (tok->n_args != 1) {
- log_fn(LOG_WARN,"Wrong # of arguments to \"dircacheport\"");
- goto err;
- }
- router->dir_port = (uint16_t) tor_parse_long(tok->args[0],10,1,65535,NULL,NULL);
- }
- tok = find_first_by_keyword(tokens, K_BANDWIDTH);
- if (tok && bw_set) {
- log_fn(LOG_WARN,"Redundant bandwidth line");
- goto err;
- } else if (tok) {
- if (tok->n_args < 3) {
- /* XXXX Once 0.0.7 is *really* dead, restore this warning to its old form*/
- log_fn(LOG_WARN,"Not enough arguments to \"bandwidth\": must be an obsolete server. Rejecting one server (nickname '%s').", router->nickname);
- goto err;
- }
- router->bandwidthrate = tor_parse_long(tok->args[0],10,0,INT_MAX,NULL,NULL);
- router->bandwidthburst = tor_parse_long(tok->args[1],10,0,INT_MAX,NULL,NULL);
- router->bandwidthcapacity = tor_parse_long(tok->args[2],10,0,INT_MAX,NULL,NULL);
- bw_set = 1;
- }
- if ((tok = find_first_by_keyword(tokens, K_UPTIME))) {
- if (tok->n_args != 1) {
- log_fn(LOG_WARN, "Unrecognized number of args on K_UPTIME; skipping.");
- } else {
- router->uptime = tor_parse_long(tok->args[0],10,0,LONG_MAX,NULL,NULL);
- }
- }
- if (!(tok = find_first_by_keyword(tokens, K_PUBLISHED))) {
- log_fn(LOG_WARN, "Missing published time"); goto err;
- }
- tor_assert(tok->n_args == 1);
- if (parse_iso_time(tok->args[0], &router->published_on) < 0)
- goto err;
- if (!(tok = find_first_by_keyword(tokens, K_ONION_KEY))) {
- log_fn(LOG_WARN, "Missing onion key"); goto err;
- }
- if (crypto_pk_keysize(tok->key) != PK_BYTES) {
- log_fn(LOG_WARN, "Wrong size on onion key: %d bits!",
- crypto_pk_keysize(tok->key)*8);
- goto err;
- }
- router->onion_pkey = tok->key;
- tok->key = NULL; /* Prevent free */
- if (!(tok = find_first_by_keyword(tokens, K_SIGNING_KEY))) {
- log_fn(LOG_WARN, "Missing identity key"); goto err;
- }
- if (crypto_pk_keysize(tok->key) != PK_BYTES) {
- log_fn(LOG_WARN, "Wrong size on identity key: %d bits!",
- crypto_pk_keysize(tok->key)*8);
- goto err;
- }
- router->identity_pkey = tok->key;
- tok->key = NULL; /* Prevent free */
- if (crypto_pk_get_digest(router->identity_pkey,router->identity_digest)) {
- log_fn(LOG_WARN, "Couldn't calculate key digest"); goto err;
- }
- if ((tok = find_first_by_keyword(tokens, K_PLATFORM))) {
- router->platform = tor_strdup(tok->args[0]);
- }
- exit_policy_tokens = find_all_exitpolicy(tokens);
- SMARTLIST_FOREACH(exit_policy_tokens, directory_token_t *, t,
- if (router_add_exit_policy(router,t)<0) {
- log_fn(LOG_WARN,"Error in exit policy"); goto err;}
- );
- if ((tok = find_first_by_keyword(tokens, K_FAMILY)) && tok->n_args) {
- int i;
- router->declared_family = smartlist_create();
- for (i=0;i<tok->n_args;++i) {
- if (!is_legal_nickname_or_hexdigest(tok->args[i])) {
- log_fn(LOG_WARN, "Illegal nickname '%s' in family line", tok->args[i]);
- goto err;
- }
- smartlist_add(router->declared_family, tor_strdup(tok->args[i]));
- }
- }
- if (!(tok = find_first_by_keyword(tokens, K_ROUTER_SIGNATURE))) {
- log_fn(LOG_WARN, "Missing router signature"); goto err;
- }
- if (strcmp(tok->object_type, "SIGNATURE") || tok->object_size != 128) {
- log_fn(LOG_WARN, "Bad object type or length on router signature");
- goto err;
- }
- if ((t=crypto_pk_public_checksig(router->identity_pkey, signed_digest,
- tok->object_body, 128)) != 20) {
- log_fn(LOG_WARN, "Invalid signature %d",t); goto err;
- }
- if (memcmp(digest, signed_digest, 20)) {
- log_fn(LOG_WARN, "Mismatched signature"); goto err;
- }
- if (!ports_set) {
- log_fn(LOG_WARN,"No ports declared; failing."); goto err;
- }
- if (!bw_set) {
- log_fn(LOG_WARN,"No bandwidth declared; failing."); goto err;
- }
- if (!router->or_port) {
- log_fn(LOG_WARN,"or_port unreadable or 0. Failing.");
- goto err;
- }
- if (!router->bandwidthrate) {
- log_fn(LOG_WARN,"bandwidthrate unreadable or 0. Failing.");
- goto err;
- }
- if (!router->platform) {
- router->platform = tor_strdup("<unknown>");
- }
- // log_fn(LOG_DEBUG,"or_port %d, socks_port %d, dir_port %d, bandwidthrate %u, bandwidthburst %u.",
- // router->or_port, router->socks_port, router->dir_port,
- // (unsigned) router->bandwidthrate, (unsigned) router->bandwidthburst);
- goto done;
- return router;
- err:
- routerinfo_free(router);
- router = NULL;
- done:
- if (tokens) {
- SMARTLIST_FOREACH(tokens, directory_token_t *, tok, token_free(tok));
- smartlist_free(tokens);
- }
- if (exit_policy_tokens) {
- smartlist_free(exit_policy_tokens);
- }
- return router;
- }
- /** Parse the exit policy in the string <b>s</b> and return it.
- */
- addr_policy_t *
- router_parse_addr_policy_from_string(const char *s)
- {
- directory_token_t *tok = NULL;
- const char *cp;
- char *tmp;
- addr_policy_t *r;
- size_t len, idx;
- /* *s might not end with \n, so we need to extend it with one. */
- len = strlen(s);
- cp = tmp = tor_malloc(len+2);
- for (idx = 0; idx < len; ++idx) {
- tmp[idx] = tolower(s[idx]);
- }
- tmp[len]='\n';
- tmp[len+1]='\0';
- tok = get_next_token(&cp, RTR_ONLY);
- if (tok->tp == _ERR) {
- log_fn(LOG_WARN, "Error reading exit policy: %s", tok->error);
- goto err;
- }
- if (tok->tp != K_ACCEPT && tok->tp != K_REJECT) {
- log_fn(LOG_WARN, "Expected 'accept' or 'reject'.");
- goto err;
- }
- /* Now that we've gotten an exit policy, add it to the router. */
- r = router_parse_addr_policy(tok);
- goto done;
- err:
- r = NULL;
- done:
- tor_free(tmp);
- token_free(tok);
- return r;
- }
- int
- router_add_exit_policy_from_string(routerinfo_t *router, const char *s)
- {
- addr_policy_t *newe, *tmpe;
- newe = router_parse_addr_policy_from_string(s);
- if (!newe)
- return -1;
- for (tmpe = router->exit_policy; tmpe; tmpe=tmpe->next)
- ;
- tmpe->next = newe;
- return 0;
- }
- static int
- router_add_exit_policy(routerinfo_t *router,directory_token_t *tok)
- {
- addr_policy_t *newe, **tmpe;
- newe = router_parse_addr_policy(tok);
- if (!newe)
- return -1;
- for (tmpe = &router->exit_policy; *tmpe; tmpe=&((*tmpe)->next))
- ;
- *tmpe = newe;
- return 0;
- }
- /** Given a K_ACCEPT or K_REJECT token and a router, create and return
- * a new exit_policy_t corresponding to the token. */
- static addr_policy_t *
- router_parse_addr_policy(directory_token_t *tok) {
- addr_policy_t *newe;
- struct in_addr in;
- char *arg, *address;
- tor_assert(tok->tp == K_REJECT || tok->tp == K_ACCEPT);
- if (tok->n_args != 1)
- return NULL;
- arg = tok->args[0];
- newe = tor_malloc_zero(sizeof(addr_policy_t));
- newe->string = tor_malloc(8+strlen(arg));
- /* XXX eventually, use the code from router.c:727 to generate this */
- tor_snprintf(newe->string, 8+strlen(arg), "%s %s",
- (tok->tp == K_REJECT) ? "reject" : "accept", arg);
- newe->policy_type = (tok->tp == K_REJECT) ? ADDR_POLICY_REJECT
- : ADDR_POLICY_ACCEPT;
- if (parse_addr_and_port_range(arg, &newe->addr, &newe->msk,
- &newe->prt_min, &newe->prt_max))
- goto policy_read_failed;
- in.s_addr = htonl(newe->addr);
- address = tor_strdup(inet_ntoa(in));
- // in.s_addr = htonl(newe->msk);
- // log_fn(LOG_DEBUG,"%s %s/%s:%d-%d",
- // newe->policy_type == ADDR_POLICY_REJECT ? "reject" : "accept",
- // address, inet_ntoa(in), newe->prt_min, newe->prt_max);
- tor_free(address);
- return newe;
- policy_read_failed:
- tor_assert(newe->string);
- log_fn(LOG_WARN,"Couldn't parse line '%s'. Dropping", newe->string);
- tor_free(newe->string);
- tor_free(newe);
- return NULL;
- }
- void
- assert_addr_policy_ok(addr_policy_t *t)
- {
- addr_policy_t *t2;
- while (t) {
- tor_assert(t->policy_type == ADDR_POLICY_REJECT ||
- t->policy_type == ADDR_POLICY_ACCEPT);
- tor_assert(t->prt_min <= t->prt_max);
- t2 = router_parse_addr_policy_from_string(t->string);
- tor_assert(t2);
- tor_assert(t2->policy_type == t->policy_type);
- tor_assert(t2->addr == t->addr);
- tor_assert(t2->msk == t->msk);
- tor_assert(t2->prt_min == t->prt_min);
- tor_assert(t2->prt_max == t->prt_max);
- tor_assert(!strcmp(t2->string, t->string));
- tor_assert(t2->next == NULL);
- addr_policy_free(t2);
- t = t->next;
- }
- }
- /*
- * Low-level tokenizer for router descriptors and directories.
- */
- /** Free all resources allocated for <b>tok</b> */
- static void
- token_free(directory_token_t *tok)
- {
- int i;
- tor_assert(tok);
- if (tok->args) {
- for (i = 0; i < tok->n_args; ++i) {
- tor_free(tok->args[i]);
- }
- tor_free(tok->args);
- }
- tor_free(tok->object_type);
- tor_free(tok->object_body);
- if (tok->key)
- crypto_free_pk_env(tok->key);
- tor_free(tok);
- }
- /** Helper function: read the next token from *s, advance *s to the end
- * of the token, and return the parsed token. If 'where' is DIR_ONLY
- * or RTR_ONLY, reject all tokens of the wrong type.
- */
- static directory_token_t *
- get_next_token(const char **s, where_syntax where) {
- const char *next, *obstart;
- int i, done, allocated, is_opt;
- directory_token_t *tok;
- arg_syntax a_syn;
- obj_syntax o_syn = NO_OBJ;
- #define RET_ERR(msg) \
- do { if (tok) token_free(tok); \
- tok = tor_malloc_zero(sizeof(directory_token_t));\
- tok->tp = _ERR; \
- tok->error = msg; \
- goto done_tokenizing; } while (0)
- tok = tor_malloc_zero(sizeof(directory_token_t));
- tok->tp = _ERR;
- *s = eat_whitespace(*s);
- if (!**s) {
- tok->tp = _EOF;
- return tok;
- }
- next = find_whitespace(*s);
- if (!next) {
- tok->error = "Unexpected EOF"; return tok;
- }
- /* It's a keyword... but which one? */
- is_opt = !strncmp("opt", *s, next-*s);
- if (is_opt) {
- *s = eat_whitespace(next);
- next = NULL;
- if (**s)
- next = find_whitespace(*s);
- if (!**s || !next) {
- RET_ERR("opt without keyword");
- }
- }
- for (i = 0; token_table[i].t ; ++i) {
- if (!strncmp(token_table[i].t, *s, next-*s)) {
- /* We've found the keyword. */
- tok->tp = token_table[i].v;
- a_syn = token_table[i].s;
- o_syn = token_table[i].os;
- if (token_table[i].ws != ANY && token_table[i].ws != where) {
- if (where == DIR_ONLY) {
- RET_ERR("Found a router-only token in a directory section");
- } else {
- RET_ERR("Found a directory-only token in a router descriptor");
- }
- }
- if (a_syn == ARGS) {
- /* This keyword takes multiple arguments. */
- i = 0;
- done = (*next == '\n');
- allocated = 32;
- tok->args = tor_malloc(sizeof(char*)*32);
- *s = eat_whitespace_no_nl(next);
- while (**s != '\n' && !done) {
- next = find_whitespace(*s);
- if (*next == '\n')
- done = 1;
- if (i == allocated) {
- allocated *= 2;
- tok->args = tor_realloc(tok->args,sizeof(char*)*allocated);
- }
- tok->args[i++] = tor_strndup(*s,next-*s);
- *s = eat_whitespace_no_nl(next+1);
- }
- tok->n_args = i;
- } else if (a_syn == CONCAT_ARGS) {
- /* The keyword takes the line as a single argument */
- *s = eat_whitespace_no_nl(next);
- next = strchr(*s, '\n');
- if (!next)
- RET_ERR("Unexpected EOF");
- tok->args = tor_malloc(sizeof(char*));
- tok->args[0] = tor_strndup(*s,next-*s);
- tok->n_args = 1;
- *s = eat_whitespace_no_nl(next+1);
- } else {
- /* The keyword takes no arguments. */
- tor_assert(a_syn == NO_ARGS);
- *s = eat_whitespace_no_nl(next);
- if (**s != '\n') {
- RET_ERR("Unexpected arguments");
- }
- tok->n_args = 0;
- *s = eat_whitespace_no_nl(*s+1);
- }
- break;
- }
- }
- if (tok->tp == _ERR) {
- if (is_opt) {
- tok->tp = K_OPT;
- *s = eat_whitespace_no_nl(next);
- next = strchr(*s,'\n');
- if (!next)
- RET_ERR("Unexpected EOF");
- tok->args = tor_malloc(sizeof(char*));
- tok->args[0] = tor_strndup(*s,next-*s);
- tok->n_args = 1;
- *s = eat_whitespace_no_nl(next+1);
- o_syn = OBJ_OK;
- } else {
- tok->tp = _UNRECOGNIZED;
- next = strchr(*s, '\n');
- if (!next) {
- RET_ERR("Unexpected EOF");
- }
- tok->args = tor_malloc(sizeof(char*));
- tok->args[0] = tor_strndup(*s,next-*s);
- tok->n_args = 1;
- *s = next+1;
- o_syn = OBJ_OK;
- }
- }
- *s = eat_whitespace(*s);
- if (strcmpstart(*s, "-----BEGIN ")) {
- goto done_tokenizing;
- }
- obstart = *s;
- *s += 11; /* length of "-----BEGIN ". */
- next = strchr(*s, '\n');
- if (next-*s < 6 || strcmpstart(next-5, "-----\n")) {
- RET_ERR("Malformed object: bad begin line");
- }
- tok->object_type = tor_strndup(*s, next-*s-5);
- *s = next+1;
- next = strstr(*s, "-----END ");
- if (!next) {
- RET_ERR("Malformed object: missing end line");
- }
- if (!strcmp(tok->object_type, "RSA PUBLIC KEY")) {
- if (strcmpstart(next, "-----END RSA PUBLIC KEY-----\n"))
- RET_ERR("Malformed object: mismatched end line");
- next = strchr(next,'\n')+1;
- tok->key = crypto_new_pk_env();
- if (crypto_pk_read_public_key_from_string(tok->key, obstart, next-obstart))
- RET_ERR("Couldn't parse public key.");
- *s = next;
- } else {
- tok->object_body = tor_malloc(next-*s); /* really, this is too much RAM. */
- i = base64_decode(tok->object_body, 256, *s, next-*s);
- if (i<0) {
- RET_ERR("Malformed object: bad base64-encoded data");
- }
- tok->object_size = i;
- *s = next + 9; /* length of "-----END ". */
- i = strlen(tok->object_type);
- if (strncmp(*s, tok->object_type, i) || strcmpstart(*s+i, "-----\n")) {
- RET_ERR("Malformed object: mismatched end tag");
- }
- *s += i+6;
- }
- switch (o_syn)
- {
- case NO_OBJ:
- if (tok->object_body)
- RET_ERR("Unexpected object for keyword");
- if (tok->key)
- RET_ERR("Unexpected public key for keyword");
- break;
- case NEED_OBJ:
- if (!tok->object_body)
- RET_ERR("Missing object for keyword");
- break;
- case NEED_KEY:
- if (!tok->key)
- RET_ERR("Missing public key for keyword");
- break;
- case OBJ_OK:
- break;
- }
- done_tokenizing:
- #if 0
- for (i = 0; token_table[i].t ; ++i) {
- if (token_table[i].v == tok->tp) {
- fputs(token_table[i].t, stdout);
- break;
- i = -1;
- }
- }
- if (i) {
- if (tok->tp == _UNRECOGNIZED) fputs("UNRECOGNIZED", stdout);
- if (tok->tp == _ERR) fputs("ERR",stdout);
- if (tok->tp == _EOF) fputs("EOF",stdout);
- if (tok->tp == _NIL) fputs("_NIL",stdout);
- }
- for (i = 0; i < tok->n_args; ++i) {
- fprintf(stdout," \"%s\"", tok->args[i]);
- }
- if (tok->error) { fprintf(stdout," *%s*", tok->error); }
- fputs("\n",stdout);
- #endif
- return tok;
- #undef RET_ERR
- }
- /** Read all tokens from a string between <b>start</b> and <b>end</b>, and add
- * them to <b>out</b>. If <b>is_dir</b> is true, reject all non-directory
- * tokens; else reject all non-routerdescriptor tokens.
- */
- static int
- tokenize_string(const char *start, const char *end, smartlist_t *out,
- int is_dir)
- {
- const char **s;
- directory_token_t *tok = NULL;
- where_syntax where = is_dir ? DIR_ONLY : RTR_ONLY;
- s = &start;
- while (*s < end && (!tok || tok->tp != _EOF)) {
- tok = get_next_token(s, where);
- if (tok->tp == _ERR) {
- log_fn(LOG_WARN, "parse error: %s", tok->error);
- return -1;
- }
- smartlist_add(out, tok);
- *s = eat_whitespace(*s);
- }
- return 0;
- }
- /** Find the first token in <b>s</b> whose keyword is <b>keyword</b>; return
- * NULL if no such keyword is found.
- */
- static directory_token_t *
- find_first_by_keyword(smartlist_t *s, directory_keyword keyword)
- {
- SMARTLIST_FOREACH(s, directory_token_t *, t, if (t->tp == keyword) return t);
- return NULL;
- }
- /** Return a newly allocated smartlist of all accept or reject tokens in
- * <b>s</b>.
- */
- static smartlist_t *
- find_all_exitpolicy(smartlist_t *s)
- {
- smartlist_t *out = smartlist_create();
- SMARTLIST_FOREACH(s, directory_token_t *, t,
- if (t->tp == K_ACCEPT || t->tp == K_REJECT)
- smartlist_add(out,t));
- return out;
- }
- /** Compute the SHA digest of the substring of <b>s</b> taken from the first
- * occurrence of <b>start_str</b> through the first newline after the first
- * subsequent occurrence of <b>end_str</b>; store the 20-byte result in
- * <b>digest</b>; return 0 on success.
- *
- * If no such substring exists, return -1.
- */
- static int router_get_hash_impl(const char *s, char *digest,
- const char *start_str,
- const char *end_str)
- {
- char *start, *end;
- start = strstr(s, start_str);
- if (!start) {
- log_fn(LOG_WARN,"couldn't find \"%s\"",start_str);
- return -1;
- }
- if (start != s && *(start-1) != '\n') {
- log_fn(LOG_WARN, "first occurrence of \"%s\" is not at the start of a line",
- start_str);
- return -1;
- }
- end = strstr(start+strlen(start_str), end_str);
- if (!end) {
- log_fn(LOG_WARN,"couldn't find \"%s\"",end_str);
- return -1;
- }
- end = strchr(end+strlen(end_str), '\n');
- if (!end) {
- log_fn(LOG_WARN,"couldn't find EOL");
- return -1;
- }
- ++end;
- if (crypto_digest(digest, start, end-start)) {
- log_fn(LOG_WARN,"couldn't compute digest");
- return -1;
- }
- return 0;
- }
- /** Parse the Tor version of the platform string <b>platform</b>,
- * and compare it to the version in <b>cutoff</b>. Return 1 if
- * the router is at least as new as the cutoff, else return 0.
- */
- int tor_version_as_new_as(const char *platform, const char *cutoff) {
- tor_version_t cutoff_version, router_version;
- char *s, *start;
- char tmp[128];
- if (tor_version_parse(cutoff, &cutoff_version)<0) {
- log_fn(LOG_WARN,"Bug: cutoff version '%s' unparseable.",cutoff);
- return 0;
- }
- if (strcmpstart(platform,"Tor ")) /* nonstandard Tor; be safe and say yes */
- return 1;
- start = (char *)eat_whitespace(platform+3);
- if (!*start) return 0;
- s = (char *)find_whitespace(start); /* also finds '\0', which is fine */
- if ((size_t)(s-start+1) >= sizeof(tmp)) /* too big, no */
- return 0;
- strlcpy(tmp, start, s-start+1);
- if (tor_version_parse(tmp, &router_version)<0) {
- log_fn(LOG_INFO,"Router version '%s' unparseable.",tmp);
- return 1; /* be safe and say yes */
- }
- return tor_version_compare(&router_version, &cutoff_version) >= 0;
- }
- /** Parse a tor version from <b>s</b>, and store the result in <b>out</b>.
- * Return 0 on success, -1 on failure. */
- int tor_version_parse(const char *s, tor_version_t *out)
- {
- char *eos=NULL, *cp=NULL;
- /* Format is:
- * NUM dot NUM dot NUM [ ( pre | rc | dot ) NUM [ -cvs ] ]
- */
- tor_assert(s);
- tor_assert(out);
- memset(out, 0, sizeof(tor_version_t));
- /* Get major. */
- out->major = strtol(s,&eos,10);
- if (!eos || eos==s || *eos != '.') return -1;
- cp = eos+1;
- /* Get minor */
- out->minor = strtol(cp,&eos,10);
- if (!eos || eos==cp || *eos != '.') return -1;
- cp = eos+1;
- /* Get micro */
- out->micro = strtol(cp,&eos,10);
- if (!eos || eos==cp) return -1;
- if (!*eos) {
- out->status = VER_RELEASE;
- out->patchlevel = 0;
- out->cvs = IS_NOT_CVS;
- return 0;
- }
- cp = eos;
- /* Get status */
- if (*cp == '.') {
- out->status = VER_RELEASE;
- ++cp;
- } else if (0==strncmp(cp, "pre", 3)) {
- out->status = VER_PRE;
- cp += 3;
- } else if (0==strncmp(cp, "rc", 2)) {
- out->status = VER_RC;
- cp += 2;
- } else {
- return -1;
- }
- /* Get patchlevel */
- out->patchlevel = strtol(cp,&eos,10);
- if (!eos || eos==cp) return -1;
- cp = eos;
- /* Get cvs status and status tag. */
- if (*cp == '-' || *cp == '.')
- ++cp;
- strlcpy(out->status_tag, cp, sizeof(out->status_tag));
- if (0==strcmp(cp, "cvs")) {
- out->cvs = IS_CVS;
- } else {
- out->cvs = IS_NOT_CVS;
- }
- return 0;
- }
- /** Compare two tor versions; Return <0 if a < b; 0 if a ==b, >0 if a >
- * b. */
- int tor_version_compare(tor_version_t *a, tor_version_t *b)
- {
- int i;
- tor_assert(a);
- tor_assert(b);
- if ((i = a->major - b->major))
- return i;
- else if ((i = a->minor - b->minor))
- return i;
- else if ((i = a->micro - b->micro))
- return i;
- else if ((i = a->status - b->status))
- return i;
- else if ((i = a->patchlevel - b->patchlevel))
- return i;
- if (a->major > 0 || a->minor > 0) {
- return strcmp(a->status_tag, b->status_tag);
- } else {
- return (a->cvs - b->cvs);
- }
- }
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