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- /* Copyright 2001-2004 Roger Dingledine.
- * Copyright 2004-2007 Roger Dingledine, Nick Mathewson. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- const char directory_c_id[] =
- "$Id$";
- #include "or.h"
- /**
- * \file directory.c
- * \brief Code to send and fetch directories and router
- * descriptors via HTTP. Directories use dirserv.c to generate the
- * results; clients use routers.c to parse them.
- **/
- /* In-points to directory.c:
- *
- * - directory_post_to_dirservers(), called from
- * router_upload_dir_desc_to_dirservers() in router.c
- * upload_service_descriptor() in rendservice.c
- * - directory_get_from_dirserver(), called from
- * rend_client_refetch_renddesc() in rendclient.c
- * run_scheduled_events() in main.c
- * do_hup() in main.c
- * - connection_dir_process_inbuf(), called from
- * connection_process_inbuf() in connection.c
- * - connection_dir_finished_flushing(), called from
- * connection_finished_flushing() in connection.c
- * - connection_dir_finished_connecting(), called from
- * connection_finished_connecting() in connection.c
- */
- static void
- directory_send_command(dir_connection_t *conn,
- int purpose, int direct, const char *resource,
- const char *payload, size_t payload_len);
- static int directory_handle_command(dir_connection_t *conn);
- static int body_is_plausible(const char *body, size_t body_len, int purpose);
- static int purpose_is_private(uint8_t purpose);
- static char *http_get_header(const char *headers, const char *which);
- static void http_set_address_origin(const char *headers, connection_t *conn);
- static void connection_dir_download_networkstatus_failed(
- dir_connection_t *conn, int status_code);
- static void connection_dir_download_routerdesc_failed(dir_connection_t *conn);
- static void dir_networkstatus_download_failed(smartlist_t *failed,
- int status_code);
- static void dir_routerdesc_download_failed(smartlist_t *failed,
- int status_code);
- static void note_request(const char *key, size_t bytes);
- /********* START VARIABLES **********/
- /** How far in the future do we allow a directory server to tell us it is
- * before deciding that one of us has the wrong time? */
- #define ALLOW_DIRECTORY_TIME_SKEW (30*60)
- #define X_ADDRESS_HEADER "X-Your-Address-Is: "
- /** HTTP cache control: how long do we tell proxies they can cache each
- * kind of document we serve? */
- #define FULL_DIR_CACHE_LIFETIME (60*60)
- #define RUNNINGROUTERS_CACHE_LIFETIME (20*60)
- #define NETWORKSTATUS_CACHE_LIFETIME (5*60)
- #define ROUTERDESC_CACHE_LIFETIME (30*60)
- #define ROUTERDESC_BY_DIGEST_CACHE_LIFETIME (48*60*60)
- #define ROBOTS_CACHE_LIFETIME (24*60*60)
- /********* END VARIABLES ************/
- /** Return true iff the directory purpose 'purpose' must use an
- * anonymous connection to a directory. */
- static int
- purpose_is_private(uint8_t purpose)
- {
- if (get_options()->AllDirActionsPrivate)
- return 1;
- if (purpose == DIR_PURPOSE_FETCH_DIR ||
- purpose == DIR_PURPOSE_UPLOAD_DIR ||
- purpose == DIR_PURPOSE_FETCH_RUNNING_LIST ||
- purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS ||
- purpose == DIR_PURPOSE_FETCH_SERVERDESC)
- return 0;
- return 1;
- }
- /** Start a connection to every known directory server, using
- * connection purpose 'purpose' and uploading the payload 'payload'
- * (length 'payload_len'). The purpose should be one of
- * 'DIR_PURPOSE_UPLOAD_DIR' or 'DIR_PURPOSE_UPLOAD_RENDDESC'.
- */
- void
- directory_post_to_dirservers(uint8_t purpose, const char *payload,
- size_t payload_len)
- {
- smartlist_t *dirservers;
- int post_via_tor;
- int post_to_hidserv_only;
- dirservers = router_get_trusted_dir_servers();
- tor_assert(dirservers);
- /* Only old dirservers handle rendezvous descriptor publishing. */
- post_to_hidserv_only = (purpose == DIR_PURPOSE_UPLOAD_RENDDESC);
- /* This tries dirservers which we believe to be down, but ultimately, that's
- * harmless, and we may as well err on the side of getting things uploaded.
- */
- SMARTLIST_FOREACH(dirservers, trusted_dir_server_t *, ds,
- {
- routerstatus_t *rs = &(ds->fake_status.status);
- if (post_to_hidserv_only && !ds->is_hidserv_authority)
- continue;
- if (!post_to_hidserv_only &&
- !(ds->is_v1_authority || ds->is_v2_authority))
- continue;
- if (purpose == DIR_PURPOSE_UPLOAD_DIR)
- ds->has_accepted_serverdesc = 0;
- post_via_tor = purpose_is_private(purpose) ||
- !fascist_firewall_allows_address_dir(ds->addr, ds->dir_port);
- directory_initiate_command_routerstatus(rs, purpose, post_via_tor,
- NULL, payload, payload_len);
- });
- }
- /** Start a connection to a random running directory server, using
- * connection purpose 'purpose' and requesting 'resource'.
- * If <b>retry_if_no_servers</b>, then if all the possible servers seem
- * down, mark them up and try again.
- */
- void
- directory_get_from_dirserver(uint8_t purpose, const char *resource,
- int retry_if_no_servers)
- {
- routerstatus_t *rs = NULL;
- or_options_t *options = get_options();
- int prefer_authority = server_mode(options) && options->DirPort != 0;
- int directconn = !purpose_is_private(purpose);
- authority_type_t type;
- /* FFFF we could break this switch into its own function, and call
- * it elsewhere in directory.c. -RD */
- switch (purpose) {
- case DIR_PURPOSE_FETCH_NETWORKSTATUS:
- case DIR_PURPOSE_FETCH_SERVERDESC:
- type = V2_AUTHORITY;
- break;
- case DIR_PURPOSE_FETCH_DIR:
- case DIR_PURPOSE_FETCH_RUNNING_LIST:
- type = V1_AUTHORITY;
- break;
- case DIR_PURPOSE_FETCH_RENDDESC:
- type = HIDSERV_AUTHORITY;
- break;
- default:
- log_warn(LD_BUG, "Unexpected purpose %d", (int)purpose);
- return;
- }
- if (!options->FetchServerDescriptors && type != HIDSERV_AUTHORITY)
- return;
- if (directconn) {
- if (prefer_authority) {
- /* only ask authdirservers, and don't ask myself */
- rs = router_pick_trusteddirserver(type, 1, 1,
- retry_if_no_servers);
- }
- if (!rs) {
- /* anybody with a non-zero dirport will do */
- rs = router_pick_directory_server(1, 1, type==V2_AUTHORITY,
- retry_if_no_servers);
- if (!rs) {
- const char *which;
- if (purpose == DIR_PURPOSE_FETCH_DIR)
- which = "directory";
- else if (purpose == DIR_PURPOSE_FETCH_RUNNING_LIST)
- which = "status list";
- else if (purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS)
- which = "network status";
- else // if (purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS)
- which = "server descriptors";
- log_info(LD_DIR,
- "No router found for %s; falling back to dirserver list",
- which);
- rs = router_pick_trusteddirserver(type, 1, 1,
- retry_if_no_servers);
- if (!rs)
- directconn = 0; /* last resort: try routing it via Tor */
- }
- }
- }
- if (!directconn) {
- /* Never use fascistfirewall; we're going via Tor. */
- if (purpose == DIR_PURPOSE_FETCH_RENDDESC) {
- /* only ask hidserv authorities, any of them will do */
- rs = router_pick_trusteddirserver(HIDSERV_AUTHORITY, 0, 0,
- retry_if_no_servers);
- } else {
- /* anybody with a non-zero dirport will do. Disregard firewalls. */
- rs = router_pick_directory_server(1, 0, type == V2_AUTHORITY,
- retry_if_no_servers);
- /* If we have any hope of building an indirect conn, we know some router
- * descriptors. If (rs==NULL), we can't build circuits anyway, so
- * there's no point in falling back to the authorities in this case. */
- }
- }
- if (rs)
- directory_initiate_command_routerstatus(rs, purpose, !directconn,
- resource, NULL, 0);
- else {
- log_notice(LD_DIR,
- "While fetching directory info, "
- "no running dirservers known. Will try again later. "
- "(purpose %d)", purpose);
- if (!purpose_is_private(purpose)) {
- /* remember we tried them all and failed. */
- directory_all_unreachable(time(NULL));
- }
- }
- }
- /** Launch a new connection to the directory server <b>status</b> to upload or
- * download a server or rendezvous descriptor. <b>purpose</b> determines what
- * kind of directory connection we're launching, and must be one of
- * DIR_PURPOSE_{FETCH|UPLOAD}_{DIR|RENDDESC}.
- *
- * When uploading, <b>payload</b> and <b>payload_len</b> determine the content
- * of the HTTP post. Otherwise, <b>payload</b> should be NULL.
- *
- * When fetching a rendezvous descriptor, <b>resource</b> is the service ID we
- * want to fetch.
- */
- void
- directory_initiate_command_routerstatus(routerstatus_t *status,
- uint8_t purpose,
- int private_connection,
- const char *resource,
- const char *payload,
- size_t payload_len)
- {
- routerinfo_t *router;
- char address_buf[INET_NTOA_BUF_LEN+1];
- struct in_addr in;
- const char *address;
- if ((router = router_get_by_digest(status->identity_digest))) {
- address = router->address;
- } else {
- in.s_addr = htonl(status->addr);
- tor_inet_ntoa(&in, address_buf, sizeof(address_buf));
- address = address_buf;
- }
- directory_initiate_command(address, status->addr, status->dir_port,
- status->version_supports_begindir,
- status->identity_digest,
- purpose, private_connection, resource,
- payload, payload_len);
- }
- /** Return true iff <b>conn</b> is the client side of a directory connection
- * we launched to ourself in order to determine the reachability of our
- * dir_port. */
- static int
- directory_conn_is_self_reachability_test(dir_connection_t *conn)
- {
- if (conn->requested_resource &&
- !strcmpstart(conn->requested_resource,"authority")) {
- routerinfo_t *me = router_get_my_routerinfo();
- if (me &&
- router_digest_is_me(conn->identity_digest) &&
- me->addr == conn->_base.addr &&
- me->dir_port == conn->_base.port)
- return 1;
- }
- return 0;
- }
- /** Called when we are unable to complete the client's request to a directory
- * server due to a network error: Mark the router as down and try again if
- * possible.
- */
- void
- connection_dir_request_failed(dir_connection_t *conn)
- {
- if (directory_conn_is_self_reachability_test(conn)) {
- routerinfo_t *me = router_get_my_routerinfo();
- if (me)
- control_event_server_status(LOG_WARN,
- "REACHABILITY_FAILED DIRADDRESS=%s:%d",
- me->address, me->dir_port);
- return; /* this was a test fetch. don't retry. */
- }
- router_set_status(conn->identity_digest, 0); /* don't try him again */
- if (conn->_base.purpose == DIR_PURPOSE_FETCH_DIR ||
- conn->_base.purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) {
- log_info(LD_DIR, "Giving up on directory server at '%s:%d'; retrying",
- conn->_base.address, conn->_base.port);
- directory_get_from_dirserver(conn->_base.purpose, NULL,
- 0 /* don't retry_if_no_servers */);
- } else if (conn->_base.purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS) {
- log_info(LD_DIR, "Giving up on directory server at '%s'; retrying",
- conn->_base.address);
- connection_dir_download_networkstatus_failed(conn, -1);
- } else if (conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC) {
- log_info(LD_DIR, "Giving up on directory server at '%s'; retrying",
- conn->_base.address);
- connection_dir_download_routerdesc_failed(conn);
- }
- }
- /** Called when an attempt to download one or more network status
- * documents on connection <b>conn</b> failed. Decide whether to
- * retry the fetch now, later, or never.
- */
- static void
- connection_dir_download_networkstatus_failed(dir_connection_t *conn,
- int status_code)
- {
- if (!conn->requested_resource) {
- /* We never reached directory_send_command, which means that we never
- * opened a network connection. Either we're out of sockets, or the
- * network is down. Either way, retrying would be pointless. */
- return;
- }
- if (!strcmpstart(conn->requested_resource, "all")) {
- /* We're a non-authoritative directory cache; try again. Ignore status
- * code, since we don't want to keep trying forever in a tight loop
- * if all the authorities are shutting us out. */
- smartlist_t *trusted_dirs = router_get_trusted_dir_servers();
- SMARTLIST_FOREACH(trusted_dirs, trusted_dir_server_t *, ds,
- ++ds->n_networkstatus_failures);
- directory_get_from_dirserver(conn->_base.purpose, "all.z",
- 0 /* don't retry_if_no_servers */);
- } else if (!strcmpstart(conn->requested_resource, "fp/")) {
- /* We were trying to download by fingerprint; mark them all as having
- * failed, and possibly retry them later.*/
- smartlist_t *failed = smartlist_create();
- dir_split_resource_into_fingerprints(conn->requested_resource+3,
- failed, NULL, 0, 0);
- if (smartlist_len(failed)) {
- dir_networkstatus_download_failed(failed, status_code);
- SMARTLIST_FOREACH(failed, char *, cp, tor_free(cp));
- }
- smartlist_free(failed);
- }
- }
- /** Called when an attempt to download one or more router descriptors
- * on connection <b>conn</b> failed.
- */
- static void
- connection_dir_download_routerdesc_failed(dir_connection_t *conn)
- {
- /* No need to increment the failure count for routerdescs, since
- * it's not their fault. */
- /* There's no need to call this here: we already call it every 10 seconds *
- * (DESCRIPTOR_RETRY_INTERVAL) in main.c -NM */
- /* update_router_descriptor_downloads(time(NULL)); */
- (void) conn;
- }
- /** Helper for directory_initiate_command_(router|trusted_dir): send the
- * command to a server whose address is <b>address</b>, whose IP is
- * <b>addr</b>, whose directory port is <b>dir_port</b>, whose tor version
- * <b>supports_begindir</b>, and whose identity key digest is
- * <b>digest</b>. */
- void
- directory_initiate_command(const char *address, uint32_t addr,
- uint16_t dir_port, int supports_begindir,
- const char *digest, uint8_t purpose,
- int private_connection, const char *resource,
- const char *payload, size_t payload_len)
- {
- dir_connection_t *conn;
- or_options_t *options = get_options();
- int want_to_tunnel = options->TunnelDirConns && supports_begindir;
- tor_assert(address);
- tor_assert(addr);
- tor_assert(dir_port);
- tor_assert(digest);
- log_debug(LD_DIR, "private %d, want_to_tunnel %d.",
- private_connection, want_to_tunnel);
- switch (purpose) {
- case DIR_PURPOSE_FETCH_DIR:
- log_debug(LD_DIR,"initiating directory fetch");
- break;
- case DIR_PURPOSE_FETCH_RENDDESC:
- log_debug(LD_DIR,"initiating hidden-service descriptor fetch");
- break;
- case DIR_PURPOSE_UPLOAD_DIR:
- log_debug(LD_OR,"initiating server descriptor upload");
- break;
- case DIR_PURPOSE_UPLOAD_RENDDESC:
- log_debug(LD_REND,"initiating hidden-service descriptor upload");
- break;
- case DIR_PURPOSE_FETCH_RUNNING_LIST:
- log_debug(LD_DIR,"initiating running-routers fetch");
- break;
- case DIR_PURPOSE_FETCH_NETWORKSTATUS:
- log_debug(LD_DIR,"initiating network-status fetch");
- break;
- case DIR_PURPOSE_FETCH_SERVERDESC:
- log_debug(LD_DIR,"initiating server descriptor fetch");
- break;
- default:
- log_err(LD_BUG, "Unrecognized directory connection purpose.");
- tor_assert(0);
- }
- conn = TO_DIR_CONN(connection_new(CONN_TYPE_DIR));
- /* set up conn so it's got all the data we need to remember */
- conn->_base.addr = addr;
- conn->_base.port = dir_port;
- conn->_base.address = tor_strdup(address);
- memcpy(conn->identity_digest, digest, DIGEST_LEN);
- conn->_base.purpose = purpose;
- /* give it an initial state */
- conn->_base.state = DIR_CONN_STATE_CONNECTING;
- if (!private_connection && !want_to_tunnel) {
- /* then we want to connect directly */
- conn->dirconn_direct = 1;
- if (options->HttpProxy) {
- addr = options->HttpProxyAddr;
- dir_port = options->HttpProxyPort;
- }
- switch (connection_connect(TO_CONN(conn), conn->_base.address, addr,
- dir_port)) {
- case -1:
- connection_dir_request_failed(conn); /* retry if we want */
- connection_free(TO_CONN(conn));
- return;
- case 1:
- /* start flushing conn */
- conn->_base.state = DIR_CONN_STATE_CLIENT_SENDING;
- /* fall through */
- case 0:
- /* queue the command on the outbuf */
- directory_send_command(conn, purpose, 1, resource,
- payload, payload_len);
- connection_watch_events(TO_CONN(conn), EV_READ | EV_WRITE);
- /* writable indicates finish, readable indicates broken link,
- error indicates broken link in windowsland. */
- }
- } else { /* we want to connect via tor */
- /* make an AP connection
- * populate it and add it at the right state
- * socketpair and hook up both sides
- */
- conn->dirconn_direct = 0;
- conn->_base.s =
- connection_ap_make_bridge(conn->_base.address, conn->_base.port,
- digest,
- private_connection ?
- SOCKS_COMMAND_CONNECT :
- SOCKS_COMMAND_CONNECT_DIR);
- if (conn->_base.s < 0) {
- log_warn(LD_NET,"Making AP bridge to dirserver failed.");
- connection_mark_for_close(TO_CONN(conn));
- return;
- }
- if (connection_add(TO_CONN(conn)) < 0) {
- log_warn(LD_NET,"Unable to add AP bridge to dirserver.");
- connection_mark_for_close(TO_CONN(conn));
- return;
- }
- conn->_base.state = DIR_CONN_STATE_CLIENT_SENDING;
- /* queue the command on the outbuf */
- directory_send_command(conn, purpose, 0, resource,
- payload, payload_len);
- connection_watch_events(TO_CONN(conn), EV_READ | EV_WRITE);
- }
- }
- /** Queue an appropriate HTTP command on conn-\>outbuf. The other args
- * are as in directory_initiate_command.
- */
- static void
- directory_send_command(dir_connection_t *conn,
- int purpose, int direct, const char *resource,
- const char *payload, size_t payload_len)
- {
- char proxystring[256];
- char proxyauthstring[256];
- char hoststring[128];
- char *url;
- char request[8192];
- const char *httpcommand = NULL;
- size_t len;
- tor_assert(conn);
- tor_assert(conn->_base.type == CONN_TYPE_DIR);
- tor_free(conn->requested_resource);
- if (resource)
- conn->requested_resource = tor_strdup(resource);
- /* come up with a string for which Host: we want */
- if (conn->_base.port == 80) {
- strlcpy(hoststring, conn->_base.address, sizeof(hoststring));
- } else {
- tor_snprintf(hoststring, sizeof(hoststring),"%s:%d",
- conn->_base.address, conn->_base.port);
- }
- /* come up with some proxy lines, if we're using one. */
- if (direct && get_options()->HttpProxy) {
- char *base64_authenticator=NULL;
- const char *authenticator = get_options()->HttpProxyAuthenticator;
- tor_snprintf(proxystring, sizeof(proxystring),"http://%s", hoststring);
- if (authenticator) {
- base64_authenticator = alloc_http_authenticator(authenticator);
- if (!base64_authenticator)
- log_warn(LD_BUG, "Encoding http authenticator failed");
- }
- if (base64_authenticator) {
- tor_snprintf(proxyauthstring, sizeof(proxyauthstring),
- "\r\nProxy-Authorization: Basic %s",
- base64_authenticator);
- tor_free(base64_authenticator);
- } else {
- proxyauthstring[0] = 0;
- }
- } else {
- proxystring[0] = 0;
- proxyauthstring[0] = 0;
- }
- switch (purpose) {
- case DIR_PURPOSE_FETCH_DIR:
- tor_assert(!resource);
- tor_assert(!payload);
- httpcommand = "GET";
- url = tor_strdup("/tor/dir.z");
- break;
- case DIR_PURPOSE_FETCH_RUNNING_LIST:
- tor_assert(!resource);
- tor_assert(!payload);
- httpcommand = "GET";
- url = tor_strdup("/tor/running-routers");
- break;
- case DIR_PURPOSE_FETCH_NETWORKSTATUS:
- httpcommand = "GET";
- len = strlen(resource)+32;
- url = tor_malloc(len);
- tor_snprintf(url, len, "/tor/status/%s", resource);
- break;
- case DIR_PURPOSE_FETCH_SERVERDESC:
- httpcommand = "GET";
- len = strlen(resource)+32;
- url = tor_malloc(len);
- tor_snprintf(url, len, "/tor/server/%s", resource);
- break;
- case DIR_PURPOSE_UPLOAD_DIR:
- tor_assert(!resource);
- tor_assert(payload);
- httpcommand = "POST";
- url = tor_strdup("/tor/");
- break;
- case DIR_PURPOSE_FETCH_RENDDESC:
- tor_assert(resource);
- tor_assert(!payload);
- /* this must be true or we wouldn't be doing the lookup */
- tor_assert(strlen(resource) <= REND_SERVICE_ID_LEN);
- /* This breaks the function abstraction. */
- strlcpy(conn->rend_query, resource, sizeof(conn->rend_query));
- httpcommand = "GET";
- /* Request the most recent versioned descriptor. */
- // (XXXX We were going to switch this to fetch rendezvous1 descriptors,
- // but that never got testing, and it wasn't a good design.)
- len = strlen(resource)+32;
- url = tor_malloc(len);
- tor_snprintf(url, len, "/tor/rendezvous/%s", resource);
- break;
- case DIR_PURPOSE_UPLOAD_RENDDESC:
- tor_assert(!resource);
- tor_assert(payload);
- httpcommand = "POST";
- url = tor_strdup("/tor/rendezvous/publish");
- break;
- default:
- tor_assert(0);
- return;
- }
- if (strlen(proxystring) + strlen(url) >= 4096) {
- log_warn(LD_BUG,
- "Bug: squid does not like URLs longer than 4095 bytes, this "
- "one is %d bytes long: %s%s",
- (int)(strlen(proxystring) + strlen(url)), proxystring, url);
- }
- tor_snprintf(request, sizeof(request), "%s %s", httpcommand, proxystring);
- connection_write_to_buf(request, strlen(request), TO_CONN(conn));
- connection_write_to_buf(url, strlen(url), TO_CONN(conn));
- tor_free(url);
- if (!strcmp(httpcommand, "GET") && !payload) {
- tor_snprintf(request, sizeof(request),
- " HTTP/1.0\r\nHost: %s%s\r\n\r\n",
- hoststring,
- proxyauthstring);
- } else {
- tor_snprintf(request, sizeof(request),
- " HTTP/1.0\r\nContent-Length: %lu\r\nHost: %s%s\r\n\r\n",
- payload ? (unsigned long)payload_len : 0,
- hoststring,
- proxyauthstring);
- }
- connection_write_to_buf(request, strlen(request), TO_CONN(conn));
- if (payload) {
- /* then send the payload afterwards too */
- connection_write_to_buf(payload, payload_len, TO_CONN(conn));
- }
- }
- /** Parse an HTTP request string <b>headers</b> of the form
- * \verbatim
- * "\%s [http[s]://]\%s HTTP/1..."
- * \endverbatim
- * If it's well-formed, strdup the second \%s into *<b>url</b>, and
- * nul-terminate it. If the url doesn't start with "/tor/", rewrite it
- * so it does. Return 0.
- * Otherwise, return -1.
- */
- static int
- parse_http_url(const char *headers, char **url)
- {
- char *s, *start, *tmp;
- s = (char *)eat_whitespace_no_nl(headers);
- if (!*s) return -1;
- s = (char *)find_whitespace(s); /* get past GET/POST */
- if (!*s) return -1;
- s = (char *)eat_whitespace_no_nl(s);
- if (!*s) return -1;
- start = s; /* this is it, assuming it's valid */
- s = (char *)find_whitespace(start);
- if (!*s) return -1;
- /* tolerate the http[s] proxy style of putting the hostname in the url */
- if (s-start >= 4 && !strcmpstart(start,"http")) {
- tmp = start + 4;
- if (*tmp == 's')
- tmp++;
- if (s-tmp >= 3 && !strcmpstart(tmp,"://")) {
- tmp = strchr(tmp+3, '/');
- if (tmp && tmp < s) {
- log_debug(LD_DIR,"Skipping over 'http[s]://hostname' string");
- start = tmp;
- }
- }
- }
- if (s-start < 5 || strcmpstart(start,"/tor/")) { /* need to rewrite it */
- *url = tor_malloc(s - start + 5);
- strlcpy(*url,"/tor", s-start+5);
- strlcat((*url)+4, start, s-start+1);
- } else {
- *url = tor_strndup(start, s-start);
- }
- return 0;
- }
- /** Return a copy of the first HTTP header in <b>headers</b> whose key is
- * <b>which</b>. The key should be given with a terminating colon and space;
- * this function copies everything after, up to but not including the
- * following \\r\\n. */
- static char *
- http_get_header(const char *headers, const char *which)
- {
- const char *cp = headers;
- while (cp) {
- if (!strcmpstart(cp, which)) {
- char *eos;
- cp += strlen(which);
- if ((eos = strchr(cp,'\r')))
- return tor_strndup(cp, eos-cp);
- else
- return tor_strdup(cp);
- }
- cp = strchr(cp, '\n');
- if (cp)
- ++cp;
- }
- return NULL;
- }
- /** If <b>headers</b> indicates that a proxy was involved, then rewrite
- * <b>conn</b>-\>address to describe our best guess of the address that
- * originated this HTTP request. */
- static void
- http_set_address_origin(const char *headers, connection_t *conn)
- {
- char *fwd;
- fwd = http_get_header(headers, "Forwarded-For: ");
- if (!fwd)
- fwd = http_get_header(headers, "X-Forwarded-For: ");
- if (fwd) {
- struct in_addr in;
- if (!tor_inet_aton(fwd, &in) || is_internal_IP(ntohl(in.s_addr), 0)) {
- log_debug(LD_DIR, "Ignoring unrecognized or internal IP '%s'", fwd);
- tor_free(fwd);
- return;
- }
- tor_free(conn->address);
- conn->address = tor_strdup(fwd);
- tor_free(fwd);
- }
- }
- /** Parse an HTTP response string <b>headers</b> of the form
- * \verbatim
- * "HTTP/1.\%d \%d\%s\r\n...".
- * \endverbatim
- *
- * If it's well-formed, assign the status code to *<b>code</b> and
- * return 0. Otherwise, return -1.
- *
- * On success: If <b>date</b> is provided, set *date to the Date
- * header in the http headers, or 0 if no such header is found. If
- * <b>compression</b> is provided, set *<b>compression</b> to the
- * compression method given in the Content-Encoding header, or 0 if no
- * such header is found, or -1 if the value of the header is not
- * recognized. If <b>reason</b> is provided, strdup the reason string
- * into it.
- */
- int
- parse_http_response(const char *headers, int *code, time_t *date,
- compress_method_t *compression, char **reason)
- {
- int n1, n2;
- char datestr[RFC1123_TIME_LEN+1];
- smartlist_t *parsed_headers;
- tor_assert(headers);
- tor_assert(code);
- while (TOR_ISSPACE(*headers)) headers++; /* tolerate leading whitespace */
- if (sscanf(headers, "HTTP/1.%d %d", &n1, &n2) < 2 ||
- (n1 != 0 && n1 != 1) ||
- (n2 < 100 || n2 >= 600)) {
- log_warn(LD_HTTP,"Failed to parse header %s",escaped(headers));
- return -1;
- }
- *code = n2;
- parsed_headers = smartlist_create();
- smartlist_split_string(parsed_headers, headers, "\n",
- SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, -1);
- if (reason) {
- smartlist_t *status_line_elements = smartlist_create();
- tor_assert(smartlist_len(parsed_headers));
- smartlist_split_string(status_line_elements,
- smartlist_get(parsed_headers, 0),
- " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 3);
- tor_assert(smartlist_len(status_line_elements) <= 3);
- if (smartlist_len(status_line_elements) == 3) {
- *reason = smartlist_get(status_line_elements, 2);
- smartlist_set(status_line_elements, 2, NULL); /* Prevent free */
- }
- SMARTLIST_FOREACH(status_line_elements, char *, cp, tor_free(cp));
- smartlist_free(status_line_elements);
- }
- if (date) {
- *date = 0;
- SMARTLIST_FOREACH(parsed_headers, const char *, s,
- if (!strcmpstart(s, "Date: ")) {
- strlcpy(datestr, s+6, sizeof(datestr));
- /* This will do nothing on failure, so we don't need to check
- the result. We shouldn't warn, since there are many other valid
- date formats besides the one we use. */
- parse_rfc1123_time(datestr, date);
- break;
- });
- }
- if (compression) {
- const char *enc = NULL;
- SMARTLIST_FOREACH(parsed_headers, const char *, s,
- if (!strcmpstart(s, "Content-Encoding: ")) {
- enc = s+18; break;
- });
- if (!enc || !strcmp(enc, "identity")) {
- *compression = NO_METHOD;
- } else if (!strcmp(enc, "deflate") || !strcmp(enc, "x-deflate")) {
- *compression = ZLIB_METHOD;
- } else if (!strcmp(enc, "gzip") || !strcmp(enc, "x-gzip")) {
- *compression = GZIP_METHOD;
- } else {
- log_info(LD_HTTP, "Unrecognized content encoding: %s. Trying to deal.",
- escaped(enc));
- *compression = UNKNOWN_METHOD;
- }
- }
- SMARTLIST_FOREACH(parsed_headers, char *, s, tor_free(s));
- smartlist_free(parsed_headers);
- return 0;
- }
- /** Return true iff <b>body</b> doesn't start with a plausible router or
- * running-list or directory opening. This is a sign of possible compression.
- **/
- static int
- body_is_plausible(const char *body, size_t len, int purpose)
- {
- int i;
- if (len == 0)
- return 1; /* empty bodies don't need decompression */
- if (len < 32)
- return 0;
- if (purpose != DIR_PURPOSE_FETCH_RENDDESC) {
- if (!strcmpstart(body,"router") ||
- !strcmpstart(body,"signed-directory") ||
- !strcmpstart(body,"network-status") ||
- !strcmpstart(body,"running-routers"))
- return 1;
- for (i=0;i<32;++i) {
- if (!TOR_ISPRINT(body[i]) && !TOR_ISSPACE(body[i]))
- return 0;
- }
- return 1;
- } else {
- return 1;
- }
- }
- /** We are a client, and we've finished reading the server's
- * response. Parse and it and act appropriately.
- *
- * If we're still happy with using this directory server in the future, return
- * 0. Otherwise return -1; and the caller should consider trying the request
- * again.
- *
- * The caller will take care of marking the connection for close.
- */
- static int
- connection_dir_client_reached_eof(dir_connection_t *conn)
- {
- char *body;
- char *headers;
- char *reason = NULL;
- size_t body_len=0, orig_len=0;
- int status_code;
- time_t date_header=0;
- int delta;
- compress_method_t compression;
- int plausible;
- int skewed=0;
- int allow_partial = conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC;
- int was_compressed=0;
- switch (fetch_from_buf_http(conn->_base.inbuf,
- &headers, MAX_HEADERS_SIZE,
- &body, &body_len, MAX_DIR_SIZE,
- allow_partial)) {
- case -1: /* overflow */
- log_warn(LD_PROTOCOL,
- "'fetch' response too large (server '%s:%d'). Closing.",
- conn->_base.address, conn->_base.port);
- return -1;
- case 0:
- log_info(LD_HTTP,
- "'fetch' response not all here, but we're at eof. Closing.");
- return -1;
- /* case 1, fall through */
- }
- orig_len = body_len;
- if (parse_http_response(headers, &status_code, &date_header,
- &compression, &reason) < 0) {
- log_warn(LD_HTTP,"Unparseable headers (server '%s:%d'). Closing.",
- conn->_base.address, conn->_base.port);
- tor_free(body); tor_free(headers);
- return -1;
- }
- if (!reason) reason = tor_strdup("[no reason given]");
- log_debug(LD_DIR,
- "Received response from directory server '%s:%d': %d %s",
- conn->_base.address, conn->_base.port, status_code,
- escaped(reason));
- /* now check if it's got any hints for us about our IP address. */
- if (conn->dirconn_direct) {
- char *guess = http_get_header(headers, X_ADDRESS_HEADER);
- if (guess) {
- router_new_address_suggestion(guess);
- tor_free(guess);
- }
- }
- if (date_header > 0) {
- /* The date header was written very soon after we sent our request,
- * so compute the skew as the difference between sending the request
- * and the date header. (We used to check now-date_header, but that's
- * inaccurate if we spend a lot of time downloading.)
- */
- delta = conn->_base.timestamp_lastwritten - date_header;
- if (abs(delta)>ALLOW_DIRECTORY_TIME_SKEW) {
- int trusted = router_digest_is_trusted_dir(conn->identity_digest);
- log_fn(trusted ? LOG_WARN : LOG_INFO,
- LD_HTTP,
- "Received directory with skewed time (server '%s:%d'): "
- "we are %d minutes %s, or the directory is %d minutes %s.",
- conn->_base.address, conn->_base.port,
- abs(delta)/60, delta>0 ? "ahead" : "behind",
- abs(delta)/60, delta>0 ? "behind" : "ahead");
- skewed = 1; /* don't check the recommended-versions line */
- control_event_general_status(trusted ? LOG_WARN : LOG_NOTICE,
- "CLOCK_SKEW SKEW=%d SOURCE=DIRSERV:%s:%d",
- delta, conn->_base.address, conn->_base.port);
- } else {
- log_debug(LD_HTTP, "Time on received directory is within tolerance; "
- "we are %d seconds skewed. (That's okay.)", delta);
- }
- }
- (void) skewed; /* skewed isn't used yet. */
- if (status_code == 503) {
- local_routerstatus_t *rs;
- trusted_dir_server_t *ds;
- time_t now = time(NULL);
- log_info(LD_DIR,"Received http status code %d (%s) from server "
- "'%s:%d'. I'll try again soon.",
- status_code, escaped(reason), conn->_base.address,
- conn->_base.port);
- if ((rs = router_get_combined_status_by_digest(conn->identity_digest)))
- rs->last_dir_503_at = now;
- if ((ds = router_get_trusteddirserver_by_digest(conn->identity_digest)))
- ds->fake_status.last_dir_503_at = now;
- tor_free(body); tor_free(headers); tor_free(reason);
- return -1;
- }
- plausible = body_is_plausible(body, body_len, conn->_base.purpose);
- if (compression != NO_METHOD || !plausible) {
- char *new_body = NULL;
- size_t new_len = 0;
- compress_method_t guessed = detect_compression_method(body, body_len);
- if (compression == UNKNOWN_METHOD || guessed != compression) {
- /* Tell the user if we don't believe what we're told about compression.*/
- const char *description1, *description2;
- if (compression == ZLIB_METHOD)
- description1 = "as deflated";
- else if (compression == GZIP_METHOD)
- description1 = "as gzipped";
- else if (compression == NO_METHOD)
- description1 = "as uncompressed";
- else
- description1 = "with an unknown Content-Encoding";
- if (guessed == ZLIB_METHOD)
- description2 = "deflated";
- else if (guessed == GZIP_METHOD)
- description2 = "gzipped";
- else if (!plausible)
- description2 = "confusing binary junk";
- else
- description2 = "uncompressed";
- log_info(LD_HTTP, "HTTP body from server '%s:%d' was labeled %s, "
- "but it seems to be %s.%s",
- conn->_base.address, conn->_base.port, description1,
- description2,
- (compression>0 && guessed>0)?" Trying both.":"");
- }
- /* Try declared compression first if we can. */
- if (compression == GZIP_METHOD || compression == ZLIB_METHOD)
- tor_gzip_uncompress(&new_body, &new_len, body, body_len, compression,
- !allow_partial, LOG_PROTOCOL_WARN);
- /* Okay, if that didn't work, and we think that it was compressed
- * differently, try that. */
- if (!new_body &&
- (guessed == GZIP_METHOD || guessed == ZLIB_METHOD) &&
- compression != guessed)
- tor_gzip_uncompress(&new_body, &new_len, body, body_len, guessed,
- !allow_partial, LOG_PROTOCOL_WARN);
- /* If we're pretty sure that we have a compressed directory, and
- * we didn't manage to uncompress it, then warn and bail. */
- if (!plausible && !new_body) {
- log_fn(LOG_PROTOCOL_WARN, LD_HTTP,
- "Unable to decompress HTTP body (server '%s:%d').",
- conn->_base.address, conn->_base.port);
- tor_free(body); tor_free(headers); tor_free(reason);
- return -1;
- }
- if (new_body) {
- tor_free(body);
- body = new_body;
- body_len = new_len;
- was_compressed = 1;
- }
- }
- if (conn->_base.purpose == DIR_PURPOSE_FETCH_DIR) {
- /* fetch/process the directory to cache it. */
- log_info(LD_DIR,"Received directory (size %d) from server '%s:%d'",
- (int)body_len, conn->_base.address, conn->_base.port);
- if (status_code != 200) {
- log_warn(LD_DIR,"Received http status code %d (%s) from server "
- "'%s:%d' while fetching directory. I'll try again soon.",
- status_code, escaped(reason), conn->_base.address,
- conn->_base.port);
- tor_free(body); tor_free(headers); tor_free(reason);
- return -1;
- }
- if (router_parse_directory(body) < 0) {
- log_notice(LD_DIR,"I failed to parse the directory I fetched from "
- "'%s:%d'. Ignoring.", conn->_base.address, conn->_base.port);
- }
- note_request(was_compressed?"dl/dir.z":"dl/dir", orig_len);
- }
- if (conn->_base.purpose == DIR_PURPOSE_FETCH_RUNNING_LIST) {
- /* just update our list of running routers, if this list is new info */
- log_info(LD_DIR,"Received running-routers list (size %d)", (int)body_len);
- if (status_code != 200) {
- log_warn(LD_DIR,"Received http status code %d (%s) from server "
- "'%s:%d' while fetching running-routers. I'll try again soon.",
- status_code, escaped(reason), conn->_base.address,
- conn->_base.port);
- tor_free(body); tor_free(headers); tor_free(reason);
- return -1;
- }
- if (router_parse_runningrouters(body)<0) {
- log_warn(LD_DIR,
- "Bad running-routers from server '%s:%d'. I'll try again soon.",
- conn->_base.address, conn->_base.port);
- tor_free(body); tor_free(headers); tor_free(reason);
- return -1;
- }
- note_request(was_compressed?"dl/running-routers.z":
- "dl/running-routers", orig_len);
- }
- if (conn->_base.purpose == DIR_PURPOSE_FETCH_NETWORKSTATUS) {
- smartlist_t *which = NULL;
- networkstatus_source_t source;
- char *cp;
- log_info(LD_DIR,"Received networkstatus objects (size %d) from server "
- "'%s:%d'",(int) body_len, conn->_base.address, conn->_base.port);
- if (status_code != 200) {
- log_warn(LD_DIR,
- "Received http status code %d (%s) from server "
- "'%s:%d' while fetching \"/tor/status/%s\". I'll try again soon.",
- status_code, escaped(reason), conn->_base.address,
- conn->_base.port, conn->requested_resource);
- tor_free(body); tor_free(headers); tor_free(reason);
- connection_dir_download_networkstatus_failed(conn, status_code);
- return -1;
- }
- note_request(was_compressed?"dl/status.z":"dl/status", orig_len);
- if (conn->requested_resource &&
- !strcmpstart(conn->requested_resource,"fp/")) {
- source = NS_FROM_DIR_BY_FP;
- which = smartlist_create();
- dir_split_resource_into_fingerprints(conn->requested_resource+3,
- which, NULL, 0, 0);
- } else if (conn->requested_resource &&
- !strcmpstart(conn->requested_resource, "all")) {
- source = NS_FROM_DIR_ALL;
- which = smartlist_create();
- SMARTLIST_FOREACH(router_get_trusted_dir_servers(),
- trusted_dir_server_t *, ds,
- {
- char *cp = tor_malloc(HEX_DIGEST_LEN+1);
- base16_encode(cp, HEX_DIGEST_LEN+1, ds->digest, DIGEST_LEN);
- smartlist_add(which, cp);
- });
- } else {
- /* Can we even end up here? -- weasel*/
- source = NS_FROM_DIR_BY_FP;
- log_warn(LD_BUG, "We received a networkstatus but we didn't ask "
- "for it by fp, nor did we ask for all.");
- }
- cp = body;
- while (*cp) {
- char *next = strstr(cp, "\nnetwork-status-version");
- if (next)
- next[1] = '\0';
- /* learn from it, and then remove it from 'which' */
- if (router_set_networkstatus(cp, time(NULL), source, which)<0)
- break;
- if (next) {
- next[1] = 'n';
- cp = next+1;
- }
- else
- break;
- }
- routers_update_all_from_networkstatus(); /*launches router downloads*/
- directory_info_has_arrived(time(NULL), 0);
- if (which) {
- if (smartlist_len(which)) {
- dir_networkstatus_download_failed(which, status_code);
- }
- SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
- smartlist_free(which);
- }
- }
- if (conn->_base.purpose == DIR_PURPOSE_FETCH_SERVERDESC) {
- smartlist_t *which = NULL;
- int n_asked_for = 0;
- log_info(LD_DIR,"Received server info (size %d) from server '%s:%d'",
- (int)body_len, conn->_base.address, conn->_base.port);
- note_request(was_compressed?"dl/server.z":"dl/server", orig_len);
- if (conn->requested_resource &&
- !strcmpstart(conn->requested_resource,"d/")) {
- which = smartlist_create();
- dir_split_resource_into_fingerprints(conn->requested_resource+2,
- which, NULL, 0, 0);
- n_asked_for = smartlist_len(which);
- }
- if (status_code != 200) {
- int dir_okay = status_code == 404 ||
- (status_code == 400 && !strcmp(reason, "Servers unavailable."));
- /* 404 means that it didn't have them; no big deal.
- * Older (pre-0.1.1.8) servers said 400 Servers unavailable instead. */
- log_fn(dir_okay ? LOG_INFO : LOG_WARN, LD_DIR,
- "Received http status code %d (%s) from server '%s:%d' "
- "while fetching \"/tor/server/%s\". I'll try again soon.",
- status_code, escaped(reason), conn->_base.address,
- conn->_base.port, conn->requested_resource);
- if (!which) {
- connection_dir_download_routerdesc_failed(conn);
- } else {
- dir_routerdesc_download_failed(which, status_code);
- SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
- smartlist_free(which);
- }
- tor_free(body); tor_free(headers); tor_free(reason);
- return dir_okay ? 0 : -1;
- }
- /* Learn the routers, assuming we requested by fingerprint or "all".
- * Right now, we only use "authority" to fetch ourself, so we don't want
- * to risk replacing ourself with a router running at the addr:port we
- * think we have.
- */
- if (which || (conn->requested_resource &&
- !strcmpstart(conn->requested_resource, "all"))) {
- /* as we learn from them, we remove them from 'which' */
- router_load_routers_from_string(body, SAVED_NOWHERE, which);
- directory_info_has_arrived(time(NULL), 0);
- }
- if (which) { /* mark remaining ones as failed */
- log_info(LD_DIR, "Received %d/%d routers requested from %s:%d",
- n_asked_for-smartlist_len(which), n_asked_for,
- conn->_base.address, (int)conn->_base.port);
- if (smartlist_len(which)) {
- dir_routerdesc_download_failed(which, status_code);
- }
- SMARTLIST_FOREACH(which, char *, cp, tor_free(cp));
- smartlist_free(which);
- }
- if (directory_conn_is_self_reachability_test(conn))
- router_dirport_found_reachable();
- }
- if (conn->_base.purpose == DIR_PURPOSE_UPLOAD_DIR) {
- switch (status_code) {
- case 200: {
- int all_done = 1;
- trusted_dir_server_t *ds =
- router_get_trusteddirserver_by_digest(conn->identity_digest);
- smartlist_t *servers;
- log_info(LD_GENERAL,"eof (status 200) after uploading server "
- "descriptor: finished.");
- control_event_server_status(
- LOG_NOTICE, "ACCEPTED_SERVER_DESCRIPTOR DIRAUTH=%s:%d",
- conn->_base.address, conn->_base.port);
- ds->has_accepted_serverdesc = 1;
- servers = router_get_trusted_dir_servers();
- SMARTLIST_FOREACH(servers, trusted_dir_server_t *, d, {
- if ((d->is_v1_authority || d->is_v2_authority) &&
- !d->has_accepted_serverdesc) {
- all_done = 0;
- break;
- }
- });
- if (all_done)
- control_event_server_status(LOG_NOTICE, "GOOD_SERVER_DESCRIPTOR");
- }
- break;
- case 400:
- log_warn(LD_GENERAL,"http status 400 (%s) response from "
- "dirserver '%s:%d'. Please correct.",
- escaped(reason), conn->_base.address, conn->_base.port);
- control_event_server_status(LOG_WARN,
- "BAD_SERVER_DESCRIPTOR DIRAUTH=%s:%d REASON=\"%s\"",
- conn->_base.address, conn->_base.port, escaped(reason));
- break;
- case 403:
- log_warn(LD_GENERAL,
- "http status 403 (%s) response from dirserver "
- "'%s:%d'. Is your clock skewed? Have you mailed us your key "
- "fingerprint? Are you using the right key? Are you using a "
- "private IP address? See http://tor.eff.org/doc/"
- "tor-doc-server.html",escaped(reason), conn->_base.address,
- conn->_base.port);
- control_event_server_status(LOG_WARN,
- "BAD_SERVER_DESCRIPTOR DIRAUTH=%s:%d REASON=\"%s\"",
- conn->_base.address, conn->_base.port, escaped(reason));
- break;
- default:
- log_warn(LD_GENERAL,
- "http status %d (%s) reason unexpected while uploading "
- "descriptor to server '%s:%d').",
- status_code, escaped(reason), conn->_base.address,
- conn->_base.port);
- break;
- }
- /* return 0 in all cases, since we don't want to mark any
- * dirservers down just because they don't like us. */
- }
- if (conn->_base.purpose == DIR_PURPOSE_FETCH_RENDDESC) {
- log_info(LD_REND,"Received rendezvous descriptor (size %d, status %d "
- "(%s))",
- (int)body_len, status_code, escaped(reason));
- switch (status_code) {
- case 200:
- if (rend_cache_store(body, body_len) < 0) {
- log_warn(LD_REND,"Failed to store rendezvous descriptor.");
- /* alice's ap_stream will notice when connection_mark_for_close
- * cleans it up */
- } else {
- /* success. notify pending connections about this. */
- conn->_base.purpose = DIR_PURPOSE_HAS_FETCHED_RENDDESC;
- rend_client_desc_here(conn->rend_query);
- }
- break;
- case 404:
- /* not there. pending connections will be notified when
- * connection_mark_for_close cleans it up. */
- break;
- case 400:
- log_warn(LD_REND,
- "http status 400 (%s). Dirserver didn't like our "
- "rendezvous query?", escaped(reason));
- break;
- default:
- log_warn(LD_REND,"http status %d (%s) response unexpected while "
- "fetching hidden service descriptor (server '%s:%d').",
- status_code, escaped(reason), conn->_base.address,
- conn->_base.port);
- break;
- }
- }
- if (conn->_base.purpose == DIR_PURPOSE_UPLOAD_RENDDESC) {
- switch (status_code) {
- case 200:
- log_info(LD_REND,
- "Uploading rendezvous descriptor: finished with status "
- "200 (%s)", escaped(reason));
- break;
- case 400:
- log_warn(LD_REND,"http status 400 (%s) response from dirserver "
- "'%s:%d'. Malformed rendezvous descriptor?",
- escaped(reason), conn->_base.address, conn->_base.port);
- break;
- default:
- log_warn(LD_REND,"http status %d (%s) response unexpected (server "
- "'%s:%d').",
- status_code, escaped(reason), conn->_base.address,
- conn->_base.port);
- break;
- }
- }
- tor_free(body); tor_free(headers); tor_free(reason);
- return 0;
- }
- /** Called when a directory connection reaches EOF */
- int
- connection_dir_reached_eof(dir_connection_t *conn)
- {
- int retval;
- if (conn->_base.state != DIR_CONN_STATE_CLIENT_READING) {
- log_info(LD_HTTP,"conn reached eof, not reading. Closing.");
- connection_close_immediate(TO_CONN(conn)); /* error: give up on flushing */
- connection_mark_for_close(TO_CONN(conn));
- return -1;
- }
- retval = connection_dir_client_reached_eof(conn);
- if (retval == 0) /* success */
- conn->_base.state = DIR_CONN_STATE_CLIENT_FINISHED;
- connection_mark_for_close(TO_CONN(conn));
- return retval;
- }
- /** If any directory object is arriving, and it's over 10MB large, we're
- * getting DoS'd. (As of 0.1.2.x, raw directories are about 1MB, and we never
- * ask for more than 96 router descriptors at a time.)
- */
- #define MAX_DIRECTORY_OBJECT_SIZE (10*(1<<20))
- /** Read handler for directory connections. (That's connections <em>to</em>
- * directory servers and connections <em>at</em> directory servers.)
- */
- int
- connection_dir_process_inbuf(dir_connection_t *conn)
- {
- tor_assert(conn);
- tor_assert(conn->_base.type == CONN_TYPE_DIR);
- /* Directory clients write, then read data until they receive EOF;
- * directory servers read data until they get an HTTP command, then
- * write their response (when it's finished flushing, they mark for
- * close).
- */
- /* If we're on the dirserver side, look for a command. */
- if (conn->_base.state == DIR_CONN_STATE_SERVER_COMMAND_WAIT) {
- if (directory_handle_command(conn) < 0) {
- connection_mark_for_close(TO_CONN(conn));
- return -1;
- }
- return 0;
- }
- if (buf_datalen(conn->_base.inbuf) > MAX_DIRECTORY_OBJECT_SIZE) {
- log_warn(LD_HTTP, "Too much data received from directory connection: "
- "denial of service attempt, or you need to upgrade?");
- connection_mark_for_close(TO_CONN(conn));
- return -1;
- }
- if (!conn->_base.inbuf_reached_eof)
- log_debug(LD_HTTP,"Got data, not eof. Leaving on inbuf.");
- return 0;
- }
- /** Create an http response for the client <b>conn</b> out of
- * <b>status</b> and <b>reason_phrase</b>. Write it to <b>conn</b>.
- */
- static void
- write_http_status_line(dir_connection_t *conn, int status,
- const char *reason_phrase)
- {
- char buf[256];
- if (tor_snprintf(buf, sizeof(buf), "HTTP/1.0 %d %s\r\n\r\n",
- status, reason_phrase) < 0) {
- log_warn(LD_BUG,"Bug: status line too long.");
- return;
- }
- connection_write_to_buf(buf, strlen(buf), TO_CONN(conn));
- }
- /** Write the header for an HTTP/1.0 response onto <b>conn</b>-\>outbuf,
- * with <b>type</b> as the Content-Type.
- *
- * If <b>length</b> is nonnegative, it is the Content-Length.
- * If <b>encoding</b> is provided, it is the Content-Encoding.
- * If <b>cache_lifetime</b> is greater than 0, the content may be cached for
- * up to cache_lifetime seconds. Otherwise, the content may not be cached. */
- static void
- write_http_response_header(dir_connection_t *conn, ssize_t length,
- const char *type, const char *encoding,
- int cache_lifetime)
- {
- char date[RFC1123_TIME_LEN+1];
- char tmp[1024];
- char *cp;
- time_t now = time(NULL);
- tor_assert(conn);
- tor_assert(type);
- format_rfc1123_time(date, now);
- cp = tmp;
- tor_snprintf(cp, sizeof(tmp),
- "HTTP/1.0 200 OK\r\nDate: %s\r\nContent-Type: %s\r\n",
- date, type);
- cp += strlen(tmp);
- if (!is_internal_IP(conn->_base.addr, 0)) {
- /* Don't report the source address for a localhost/private connection. */
- tor_snprintf(cp, sizeof(tmp)-(cp-tmp),
- X_ADDRESS_HEADER "%s\r\n", conn->_base.address);
- cp += strlen(cp);
- }
- if (encoding) {
- tor_snprintf(cp, sizeof(tmp)-(cp-tmp),
- "Content-Encoding: %s\r\n", encoding);
- cp += strlen(cp);
- }
- if (length >= 0) {
- tor_snprintf(cp, sizeof(tmp)-(cp-tmp),
- "Content-Length: %ld\r\n", (long)length);
- cp += strlen(cp);
- }
- if (cache_lifetime > 0) {
- char expbuf[RFC1123_TIME_LEN+1];
- format_rfc1123_time(expbuf, now + cache_lifetime);
- /* We could say 'Cache-control: max-age=%d' here if we start doing
- * http/1.1 */
- tor_snprintf(cp, sizeof(tmp)-(cp-tmp),
- "Expires: %s\r\n", expbuf);
- cp += strlen(cp);
- } else {
- /* We could say 'Cache-control: no-cache' here if we start doing
- * http/1.1 */
- strlcpy(cp, "Pragma: no-cache\r\n", sizeof(tmp)-(cp-tmp));
- cp += strlen(cp);
- }
- if (sizeof(tmp)-(cp-tmp) > 3)
- memcpy(cp, "\r\n", 3);
- else
- tor_assert(0);
- connection_write_to_buf(tmp, strlen(tmp), TO_CONN(conn));
- }
- /** Helper function: return 1 if there are any dir conns of purpose
- * <b>purpose</b> that are going elsewhere than our own ORPort/Dirport.
- * Else return 0.
- */
- static int
- already_fetching_directory(int purpose)
- {
- int i, n;
- connection_t *conn;
- connection_t **carray;
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (conn->type == CONN_TYPE_DIR &&
- conn->purpose == purpose &&
- !conn->marked_for_close &&
- !router_digest_is_me(TO_DIR_CONN(conn)->identity_digest))
- return 1;
- }
- return 0;
- }
- #undef INSTRUMENT_DOWNLOADS
- #ifdef INSTRUMENT_DOWNLOADS
- /** Map used to keep track of how much data we've up/downloaded in what kind
- * of request. Maps from request type to pointer to uint64_t. */
- static strmap_t *request_bytes_map = NULL;
- /** Called when we just transmitted or received <b>bytes</b> worth of data
- * because of a request of type <b>key</b> (an arbitrary identifier): adds
- * <b>bytes</b> to the total associated with key. */
- static void
- note_request(const char *key, size_t bytes)
- {
- uint64_t *n;
- if (!request_bytes_map)
- request_bytes_map = strmap_new();
- n = strmap_get(request_bytes_map, key);
- if (!n) {
- n = tor_malloc_zero(sizeof(uint64_t));
- strmap_set(request_bytes_map, key, n);
- }
- *n += bytes;
- }
- /** Return a newly allocated string holding a summary of bytes used per
- * request type. */
- char *
- directory_dump_request_log(void)
- {
- smartlist_t *lines;
- char tmp[256];
- char *result;
- strmap_iter_t *iter;
- if (!request_bytes_map)
- request_bytes_map = strmap_new();
- lines = smartlist_create();
- for (iter = strmap_iter_init(request_bytes_map);
- !strmap_iter_done(iter);
- iter = strmap_iter_next(request_bytes_map, iter)) {
- const char *key;
- void *val;
- uint64_t *n;
- strmap_iter_get(iter, &key, &val);
- n = val;
- tor_snprintf(tmp, sizeof(tmp), "%s "U64_FORMAT"\n",
- key, U64_PRINTF_ARG(*n));
- smartlist_add(lines, tor_strdup(tmp));
- }
- smartlist_sort_strings(lines);
- result = smartlist_join_strings(lines, "", 0, NULL);
- SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp));
- smartlist_free(lines);
- return result;
- }
- #else
- static void
- note_request(const char *key, size_t bytes)
- {
- (void)key;
- (void)bytes;
- }
- char *
- directory_dump_request_log(void)
- {
- return tor_strdup("Not supported.");
- }
- #endif
- /** Helper function: called when a dirserver gets a complete HTTP GET
- * request. Look for a request for a directory or for a rendezvous
- * service descriptor. On finding one, write a response into
- * conn-\>outbuf. If the request is unrecognized, send a 400.
- * Always return 0. */
- static int
- directory_handle_command_get(dir_connection_t *conn, const char *headers,
- const char *body, size_t body_len)
- {
- size_t dlen;
- const char *cp;
- char *url = NULL;
- or_options_t *options = get_options();
- /* We ignore the body of a GET request. */
- (void)body;
- (void)body_len;
- log_debug(LD_DIRSERV,"Received GET command.");
- conn->_base.state = DIR_CONN_STATE_SERVER_WRITING;
- if (parse_http_url(headers, &url) < 0) {
- write_http_status_line(conn, 400, "Bad request");
- return 0;
- }
- log_debug(LD_DIRSERV,"rewritten url as '%s'.", url);
- if (!strcmp(url,"/tor/") || !strcmp(url,"/tor/dir.z")) { /* dir fetch */
- int deflated = !strcmp(url,"/tor/dir.z");
- cached_dir_t *d = dirserv_get_directory();
- if (!d) {
- log_notice(LD_DIRSERV,"Client asked for the mirrored directory, but we "
- "don't have a good one yet. Sending 503 Dir not available.");
- write_http_status_line(conn, 503, "Directory unavailable");
- /* try to get a new one now */
- if (!already_fetching_directory(DIR_PURPOSE_FETCH_DIR))
- directory_get_from_dirserver(DIR_PURPOSE_FETCH_DIR, NULL, 1);
- tor_free(url);
- return 0;
- }
- dlen = deflated ? d->dir_z_len : d->dir_len;
- if (global_write_bucket_low(TO_CONN(conn), dlen, 1)) {
- log_info(LD_DIRSERV,
- "Client asked for the mirrored directory, but we've been "
- "writing too many bytes lately. Sending 503 Dir busy.");
- write_http_status_line(conn, 503, "Directory busy, try again later");
- tor_free(url);
- return 0;
- }
- note_request(url, dlen);
- tor_free(url);
- log_debug(LD_DIRSERV,"Dumping %sdirectory to client.",
- deflated?"deflated ":"");
- write_http_response_header(conn, dlen,
- deflated?"application/octet-stream":"text/plain",
- deflated?"deflate":"identity",
- FULL_DIR_CACHE_LIFETIME);
- conn->cached_dir = d;
- conn->cached_dir_offset = 0;
- if (! deflated)
- conn->zlib_state = tor_zlib_new(0, ZLIB_METHOD);
- ++d->refcnt;
- /* Prime the connection with some data. */
- conn->dir_spool_src = DIR_SPOOL_CACHED_DIR;
- connection_dirserv_flushed_some(conn);
- return 0;
- }
- if (!strcmp(url,"/tor/running-routers") ||
- !strcmp(url,"/tor/running-routers.z")) { /* running-routers fetch */
- int deflated = !strcmp(url,"/tor/running-routers.z");
- dlen = dirserv_get_runningrouters(&cp, deflated);
- if (!dlen) { /* we failed to create/cache cp */
- write_http_status_line(conn, 503, "Directory unavailable");
- /* try to get a new one now */
- if (!already_fetching_directory(DIR_PURPOSE_FETCH_RUNNING_LIST))
- directory_get_from_dirserver(DIR_PURPOSE_FETCH_RUNNING_LIST, NULL, 1);
- tor_free(url);
- return 0;
- }
- if (global_write_bucket_low(TO_CONN(conn), dlen, 1)) {
- log_info(LD_DIRSERV,
- "Client asked for running-routers, but we've been "
- "writing too many bytes lately. Sending 503 Dir busy.");
- write_http_status_line(conn, 503, "Directory busy, try again later");
- tor_free(url);
- return 0;
- }
- note_request(url, dlen);
- tor_free(url);
- write_http_response_header(conn, dlen,
- deflated?"application/octet-stream":"text/plain",
- deflated?"deflate":"identity",
- RUNNINGROUTERS_CACHE_LIFETIME);
- connection_write_to_buf(cp, strlen(cp), TO_CONN(conn));
- return 0;
- }
- if (!strcmpstart(url,"/tor/status/")) {
- /* v2 network status fetch. */
- size_t url_len = strlen(url);
- int deflated = !strcmp(url+url_len-2, ".z");
- smartlist_t *dir_fps = smartlist_create();
- const char *request_type = NULL;
- const char *key = url + strlen("/tor/status/");
- if (deflated)
- url[url_len-2] = '\0';
- dirserv_get_networkstatus_v2_fingerprints(dir_fps, key);
- if (!strcmpstart(key, "fp/"))
- request_type = deflated?"/tor/status/fp.z":"/tor/status/fp";
- else if (!strcmpstart(key, "authority"))
- request_type = deflated?"/tor/status/authority.z":
- "/tor/status/authority";
- else if (!strcmpstart(key, "all"))
- request_type = deflated?"/tor/status/all.z":"/tor/status/all";
- else
- request_type = "/tor/status/?";
- tor_free(url);
- if (!smartlist_len(dir_fps)) { /* we failed to create/cache cp */
- write_http_status_line(conn, 503, "Network status object unavailable");
- smartlist_free(dir_fps);
- return 0;
- }
- dlen = dirserv_estimate_data_size(dir_fps, 0, deflated);
- if (global_write_bucket_low(TO_CONN(conn), dlen, 2)) {
- log_info(LD_DIRSERV,
- "Client asked for network status lists, but we've been "
- "writing too many bytes lately. Sending 503 Dir busy.");
- write_http_status_line(conn, 503, "Directory busy, try again later");
- SMARTLIST_FOREACH(dir_fps, char *, cp, tor_free(cp));
- smartlist_free(dir_fps);
- return 0;
- }
- // note_request(request_type,dlen);
- (void) request_type;
- write_http_response_header(conn, -1,
- deflated?"application/octet_stream":"text/plain",
- deflated?"deflate":NULL,
- smartlist_len(dir_fps) == 1 ? NETWORKSTATUS_CACHE_LIFETIME:0);
- conn->fingerprint_stack = dir_fps;
- if (! deflated)
- conn->zlib_state = tor_zlib_new(0, ZLIB_METHOD);
- /* Prime the connection with some data. */
- conn->dir_spool_src = DIR_SPOOL_NETWORKSTATUS;
- connection_dirserv_flushed_some(conn);
- return 0;
- }
- if (!strcmpstart(url,"/tor/server/")) {
- size_t url_len = strlen(url);
- int deflated = !strcmp(url+url_len-2, ".z");
- int res;
- const char *msg;
- const char *request_type = NULL;
- int cache_lifetime = 0;
- if (deflated)
- url[url_len-2] = '\0';
- conn->fingerprint_stack = smartlist_create();
- res = dirserv_get_routerdesc_fingerprints(conn->fingerprint_stack, url,
- &msg);
- if (!strcmpstart(url, "/tor/server/fp/")) {
- request_type = deflated?"/tor/server/fp.z":"/tor/server/fp";
- if (smartlist_len(conn->fingerprint_stack) == 1)
- cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
- } else if (!strcmpstart(url, "/tor/server/authority")) {
- request_type = deflated?"/tor/server/authority.z":
- "/tor/server/authority";
- cache_lifetime = ROUTERDESC_CACHE_LIFETIME;
- } else if (!strcmpstart(url, "/tor/server/all")) {
- request_type = deflated?"/tor/server/all.z":"/tor/server/all";
- cache_lifetime = FULL_DIR_CACHE_LIFETIME;
- } else if (!strcmpstart(url, "/tor/server/d/")) {
- request_type = deflated?"/tor/server/d.z":"/tor/server/d";
- if (smartlist_len(conn->fingerprint_stack) == 1)
- cache_lifetime = ROUTERDESC_BY_DIGEST_CACHE_LIFETIME;
- } else {
- request_type = "/tor/server/?";
- }
- (void) request_type; /* usable for note_request. */
- if (!strcmpstart(url, "/tor/server/d/"))
- conn->dir_spool_src = DIR_SPOOL_SERVER_BY_DIGEST;
- else
- conn->dir_spool_src = DIR_SPOOL_SERVER_BY_FP;
- tor_free(url);
- if (res < 0)
- write_http_status_line(conn, 404, msg);
- else {
- dlen = dirserv_estimate_data_size(conn->fingerprint_stack,
- 1, deflated);
- if (global_write_bucket_low(TO_CONN(conn), dlen, 2)) {
- log_info(LD_DIRSERV,
- "Client asked for server descriptors, but we've been "
- "writing too many bytes lately. Sending 503 Dir busy.");
- write_http_status_line(conn, 503, "Directory busy, try again later");
- return 0;
- }
- write_http_response_header(conn, -1,
- deflated?"application/octet_stream":"text/plain",
- deflated?"deflate":NULL, cache_lifetime);
- if (deflated)
- conn->zlib_state = tor_zlib_new(1, ZLIB_METHOD);
- /* Prime the connection with some data. */
- connection_dirserv_flushed_some(conn);
- }
- return 0;
- }
- if (options->HSAuthoritativeDir &&
- (!strcmpstart(url,"/tor/rendezvous/") ||
- !strcmpstart(url,"/tor/rendezvous1/"))) {
- /* rendezvous descriptor fetch */
- const char *descp;
- size_t desc_len;
- int versioned = !strcmpstart(url,"/tor/rendezvous1/");
- const char *query = url+strlen("/tor/rendezvous/")+(versioned?1:0);
- switch (rend_cache_lookup_desc(query, versioned?-1:0, &descp, &desc_len)) {
- case 1: /* valid */
- write_http_response_header(conn, desc_len, "application/octet-stream",
- NULL, 0);
- note_request("/tor/rendezvous?/", desc_len);
- /* need to send descp separately, because it may include nuls */
- connection_write_to_buf(descp, desc_len, TO_CONN(conn));
- break;
- case 0: /* well-formed but not present */
- write_http_status_line(conn, 404, "Not found");
- break;
- case -1: /* not well-formed */
- write_http_status_line(conn, 400, "Bad request");
- break;
- }
- tor_free(url);
- return 0;
- }
- if (!strcmpstart(url,"/tor/bytes.txt")) {
- char *bytes = directory_dump_request_log();
- size_t len = strlen(bytes);
- write_http_response_header(conn, len, "text/plain", NULL, 0);
- connection_write_to_buf(bytes, len, TO_CONN(conn));
- tor_free(bytes);
- tor_free(url);
- return 0;
- }
- if (!strcmp(url,"/tor/robots.txt")) { /* /robots.txt will have been
- rewritten to /tor/robots.txt */
- char robots[] = "User-agent: *\r\nDisallow: /\r\n";
- size_t len = strlen(robots);
- write_http_response_header(conn, len, "text/plain", NULL,
- ROBOTS_CACHE_LIFETIME);
- connection_write_to_buf(robots, len, TO_CONN(conn));
- tor_free(url);
- return 0;
- }
- if (!strcmp(url,"/tor/dir-all-weaselhack") &&
- (conn->_base.addr == 0x7f000001ul) &&
- authdir_mode(options)) {
- /* until weasel rewrites his scripts at noreply */
- char *new_directory=NULL;
- if (dirserv_dump_directory_to_string(&new_directory,
- get_identity_key(), 1)) {
- log_warn(LD_BUG, "Error creating full v1 directory.");
- tor_free(new_directory);
- write_http_status_line(conn, 503, "Directory unavailable");
- return 0;
- }
- dlen = strlen(new_directory);
- write_http_response_header(conn, dlen, "text/plain", "identity", 0);
- connection_write_to_buf(new_directory, dlen, TO_CONN(conn));
- tor_free(new_directory);
- tor_free(url);
- return 0;
- }
- /* we didn't recognize the url */
- write_http_status_line(conn, 404, "Not found");
- tor_free(url);
- return 0;
- }
- /** Helper function: called when a dirserver gets a complete HTTP POST
- * request. Look for an uploaded server descriptor or rendezvous
- * service descriptor. On finding one, process it and write a
- * response into conn-\>outbuf. If the request is unrecognized, send a
- * 400. Always return 0. */
- static int
- directory_handle_command_post(dir_connection_t *conn, const char *headers,
- const char *body, size_t body_len)
- {
- char *url = NULL;
- or_options_t *options = get_options();
- log_debug(LD_DIRSERV,"Received POST command.");
- conn->_base.state = DIR_CONN_STATE_SERVER_WRITING;
- if (!authdir_mode(options)) {
- /* we just provide cached directories; we don't want to
- * receive anything. */
- write_http_status_line(conn, 400, "Nonauthoritative directory does not "
- "accept posted server descriptors");
- return 0;
- }
- if (parse_http_url(headers, &url) < 0) {
- write_http_status_line(conn, 400, "Bad request");
- return 0;
- }
- log_debug(LD_DIRSERV,"rewritten url as '%s'.", url);
- if (!strcmp(url,"/tor/")) { /* server descriptor post */
- const char *msg;
- int r = dirserv_add_descriptor(body, &msg);
- tor_assert(msg);
- if (r > 0)
- dirserv_get_directory(); /* rebuild and write to disk */
- switch (r) {
- case -2:
- case -1:
- case 1:
- log_notice(LD_DIRSERV,"Rejected router descriptor from %s.",
- conn->_base.address);
- /* malformed descriptor, or something wrong */
- write_http_status_line(conn, 400, msg);
- break;
- case 0: /* accepted but discarded */
- case 2: /* accepted */
- write_http_status_line(conn, 200, msg);
- break;
- }
- goto done;
- }
- if (options->HSAuthoritativeDir &&
- !strcmpstart(url,"/tor/rendezvous/publish")) {
- /* rendezvous descriptor post */
- if (rend_cache_store(body, body_len) < 0) {
- // char tmp[1024*2+1];
- log_fn(LOG_PROTOCOL_WARN, LD_DIRSERV,
- "Rejected rend descriptor (length %d) from %s.",
- (int)body_len, conn->_base.address);
- write_http_status_line(conn, 400, "Invalid service descriptor rejected");
- } else {
- write_http_status_line(conn, 200, "Service descriptor stored");
- }
- goto done;
- }
- /* we didn't recognize the url */
- write_http_status_line(conn, 404, "Not found");
- done:
- tor_free(url);
- return 0;
- }
- /** Called when a dirserver receives data on a directory connection;
- * looks for an HTTP request. If the request is complete, remove it
- * from the inbuf, try to process it; otherwise, leave it on the
- * buffer. Return a 0 on success, or -1 on error.
- */
- static int
- directory_handle_command(dir_connection_t *conn)
- {
- char *headers=NULL, *body=NULL;
- size_t body_len=0;
- int r;
- tor_assert(conn);
- tor_assert(conn->_base.type == CONN_TYPE_DIR);
- switch (fetch_from_buf_http(conn->_base.inbuf,
- &headers, MAX_HEADERS_SIZE,
- &body, &body_len, MAX_BODY_SIZE, 0)) {
- case -1: /* overflow */
- log_warn(LD_DIRSERV,
- "Invalid input from address '%s'. Closing.",
- conn->_base.address);
- return -1;
- case 0:
- log_debug(LD_DIRSERV,"command not all here yet.");
- return 0;
- /* case 1, fall through */
- }
- http_set_address_origin(headers, TO_CONN(conn));
- //log_debug(LD_DIRSERV,"headers %s, body %s.", headers, body);
- if (!strncasecmp(headers,"GET",3))
- r = directory_handle_command_get(conn, headers, body, body_len);
- else if (!strncasecmp(headers,"POST",4))
- r = directory_handle_command_post(conn, headers, body, body_len);
- else {
- log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
- "Got headers %s with unknown command. Closing.",
- escaped(headers));
- r = -1;
- }
- tor_free(headers); tor_free(body);
- return r;
- }
- /** Write handler for directory connections; called when all data has
- * been flushed. Close the connection or wait for a response as
- * appropriate.
- */
- int
- connection_dir_finished_flushing(dir_connection_t *conn)
- {
- tor_assert(conn);
- tor_assert(conn->_base.type == CONN_TYPE_DIR);
- switch (conn->_base.state) {
- case DIR_CONN_STATE_CLIENT_SENDING:
- log_debug(LD_DIR,"client finished sending command.");
- conn->_base.state = DIR_CONN_STATE_CLIENT_READING;
- connection_stop_writing(TO_CONN(conn));
- return 0;
- case DIR_CONN_STATE_SERVER_WRITING:
- log_debug(LD_DIRSERV,"Finished writing server response. Closing.");
- connection_mark_for_close(TO_CONN(conn));
- return 0;
- default:
- log_warn(LD_BUG,"Bug: called in unexpected state %d.",
- conn->_base.state);
- tor_fragile_assert();
- return -1;
- }
- return 0;
- }
- /** Connected handler for directory connections: begin sending data to the
- * server */
- int
- connection_dir_finished_connecting(dir_connection_t *conn)
- {
- tor_assert(conn);
- tor_assert(conn->_base.type == CONN_TYPE_DIR);
- tor_assert(conn->_base.state == DIR_CONN_STATE_CONNECTING);
- log_debug(LD_HTTP,"Dir connection to router %s:%u established.",
- conn->_base.address,conn->_base.port);
- conn->_base.state = DIR_CONN_STATE_CLIENT_SENDING; /* start flushing conn */
- return 0;
- }
- /** Called when one or more networkstatus fetches have failed (with uppercase
- * fingerprints listed in <b>failed</b>). Mark those fingerprints as having
- * failed once, unless they failed with status code 503. */
- static void
- dir_networkstatus_download_failed(smartlist_t *failed, int status_code)
- {
- if (status_code == 503)
- return;
- SMARTLIST_FOREACH(failed, const char *, fp,
- {
- char digest[DIGEST_LEN];
- trusted_dir_server_t *dir;
- base16_decode(digest, DIGEST_LEN, fp, strlen(fp));
- dir = router_get_trusteddirserver_by_digest(digest);
- if (dir)
- ++dir->n_networkstatus_failures;
- });
- }
- /** Called when one or more routerdesc fetches have failed (with uppercase
- * fingerprints listed in <b>failed</b>). */
- static void
- dir_routerdesc_download_failed(smartlist_t *failed, int status_code)
- {
- char digest[DIGEST_LEN];
- local_routerstatus_t *rs;
- time_t now = time(NULL);
- int server = server_mode(get_options()) && get_options()->DirPort;
- SMARTLIST_FOREACH(failed, const char *, cp,
- {
- base16_decode(digest, DIGEST_LEN, cp, strlen(cp));
- rs = router_get_combined_status_by_digest(digest);
- if (!rs || rs->n_download_failures >= MAX_ROUTERDESC_DOWNLOAD_FAILURES)
- continue;
- if (status_code != 503 || server)
- ++rs->n_download_failures;
- if (server) {
- switch (rs->n_download_failures) {
- case 0: rs->next_attempt_at = 0; break;
- case 1: rs->next_attempt_at = 0; break;
- case 2: rs->next_attempt_at = 0; break;
- case 3: rs->next_attempt_at = now+60; break;
- case 4: rs->next_attempt_at = now+60; break;
- case 5: rs->next_attempt_at = now+60*2; break;
- case 6: rs->next_attempt_at = now+60*5; break;
- case 7: rs->next_attempt_at = now+60*15; break;
- default: rs->next_attempt_at = TIME_MAX; break;
- }
- } else {
- switch (rs->n_download_failures) {
- case 0: rs->next_attempt_at = 0; break;
- case 1: rs->next_attempt_at = 0; break;
- case 2: rs->next_attempt_at = now+60; break;
- case 3: rs->next_attempt_at = now+60*5; break;
- case 4: rs->next_attempt_at = now+60*10; break;
- default: rs->next_attempt_at = TIME_MAX; break;
- }
- }
- if (rs->next_attempt_at == 0)
- log_debug(LD_DIR, "%s failed %d time(s); I'll try again immediately.",
- cp, (int)rs->n_download_failures);
- else if (rs->next_attempt_at < TIME_MAX)
- log_debug(LD_DIR, "%s failed %d time(s); I'll try again in %d seconds.",
- cp, (int)rs->n_download_failures,
- (int)(rs->next_attempt_at-now));
- else
- log_debug(LD_DIR, "%s failed %d time(s); Giving up for a while.",
- cp, (int)rs->n_download_failures);
- });
- /* There's no need to call this here: we already call it every 10 seconds *
- * (DESCRIPTOR_RETRY_INTERVAL) in main.c -NM */
- /* update_router_descriptor_downloads(time(NULL)); */
- }
- /** Given a directory <b>resource</b> request, containing zero
- * or more strings separated by plus signs, followed optionally by ".z", store
- * the strings, in order, into <b>fp_out</b>. If <b>compressed_out</b> is
- * non-NULL, set it to 1 if the resource ends in ".z", else set it to 0. If
- * decode_hex is true, then delete all elements that aren't hex digests, and
- * decode the rest. If sort_uniq is true, then sort the list and remove
- * all duplicates.
- */
- int
- dir_split_resource_into_fingerprints(const char *resource,
- smartlist_t *fp_out, int *compressed_out,
- int decode_hex, int sort_uniq)
- {
- smartlist_t *fp_tmp = smartlist_create();
- tor_assert(fp_out);
- smartlist_split_string(fp_tmp, resource, "+", 0, 0);
- if (compressed_out)
- *compressed_out = 0;
- if (smartlist_len(fp_tmp)) {
- char *last = smartlist_get(fp_tmp,smartlist_len(fp_tmp)-1);
- size_t last_len = strlen(last);
- if (last_len > 2 && !strcmp(last+last_len-2, ".z")) {
- last[last_len-2] = '\0';
- if (compressed_out)
- *compressed_out = 1;
- }
- }
- if (decode_hex) {
- int i;
- char *cp, *d = NULL;
- for (i = 0; i < smartlist_len(fp_tmp); ++i) {
- cp = smartlist_get(fp_tmp, i);
- if (strlen(cp) != HEX_DIGEST_LEN) {
- log_info(LD_DIR,
- "Skipping digest %s with non-standard length.", escaped(cp));
- smartlist_del_keeporder(fp_tmp, i--);
- goto again;
- }
- d = tor_malloc_zero(DIGEST_LEN);
- if (base16_decode(d, DIGEST_LEN, cp, HEX_DIGEST_LEN)<0) {
- log_info(LD_DIR, "Skipping non-decodable digest %s", escaped(cp));
- smartlist_del_keeporder(fp_tmp, i--);
- goto again;
- }
- smartlist_set(fp_tmp, i, d);
- d = NULL;
- again:
- tor_free(cp);
- tor_free(d);
- }
- }
- if (sort_uniq) {
- smartlist_t *fp_tmp2 = smartlist_create();
- int i;
- if (decode_hex)
- smartlist_sort_digests(fp_tmp);
- else
- smartlist_sort_strings(fp_tmp);
- if (smartlist_len(fp_tmp))
- smartlist_add(fp_tmp2, smartlist_get(fp_tmp, 0));
- for (i = 1; i < smartlist_len(fp_tmp); ++i) {
- char *cp = smartlist_get(fp_tmp, i);
- char *last = smartlist_get(fp_tmp2, smartlist_len(fp_tmp2)-1);
- if ((decode_hex && memcmp(cp, last, DIGEST_LEN))
- || (!decode_hex && strcasecmp(cp, last)))
- smartlist_add(fp_tmp2, cp);
- else
- tor_free(cp);
- }
- smartlist_free(fp_tmp);
- fp_tmp = fp_tmp2;
- }
- smartlist_add_all(fp_out, fp_tmp);
- smartlist_free(fp_tmp);
- return 0;
- }
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