/* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. * Copyright (c) 2007-2011, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** * \file control.c * \brief Implementation for Tor's control-socket interface. * See doc/spec/control-spec.txt for full details on protocol. **/ #define CONTROL_PRIVATE #include "or.h" #include "buffers.h" #include "circuitbuild.h" #include "circuitlist.h" #include "circuituse.h" #include "config.h" #include "connection.h" #include "connection_edge.h" #include "connection_or.h" #include "control.h" #include "directory.h" #include "dirserv.h" #include "dnsserv.h" #include "geoip.h" #include "hibernate.h" #include "main.h" #include "networkstatus.h" #include "nodelist.h" #include "policies.h" #include "reasons.h" #include "router.h" #include "routerlist.h" #include "routerparse.h" #ifndef MS_WINDOWS #include #include #endif #include "procmon.h" /** Yield true iff s is the state of a control_connection_t that has * finished authentication and is accepting commands. */ #define STATE_IS_OPEN(s) ((s) == CONTROL_CONN_STATE_OPEN) /* Recognized asynchronous event types. It's okay to expand this list * because it is used both as a list of v0 event types, and as indices * into the bitfield to determine which controllers want which events. */ #define _EVENT_MIN 0x0001 #define EVENT_CIRCUIT_STATUS 0x0001 #define EVENT_STREAM_STATUS 0x0002 #define EVENT_OR_CONN_STATUS 0x0003 #define EVENT_BANDWIDTH_USED 0x0004 #define EVENT_LOG_OBSOLETE 0x0005 /* Can reclaim this. */ #define EVENT_NEW_DESC 0x0006 #define EVENT_DEBUG_MSG 0x0007 #define EVENT_INFO_MSG 0x0008 #define EVENT_NOTICE_MSG 0x0009 #define EVENT_WARN_MSG 0x000A #define EVENT_ERR_MSG 0x000B #define EVENT_ADDRMAP 0x000C // #define EVENT_AUTHDIR_NEWDESCS 0x000D #define EVENT_DESCCHANGED 0x000E // #define EVENT_NS 0x000F #define EVENT_STATUS_CLIENT 0x0010 #define EVENT_STATUS_SERVER 0x0011 #define EVENT_STATUS_GENERAL 0x0012 #define EVENT_GUARD 0x0013 #define EVENT_STREAM_BANDWIDTH_USED 0x0014 #define EVENT_CLIENTS_SEEN 0x0015 #define EVENT_NEWCONSENSUS 0x0016 #define EVENT_BUILDTIMEOUT_SET 0x0017 #define EVENT_SIGNAL 0x0018 #define EVENT_CONF_CHANGED 0x0019 #define _EVENT_MAX 0x0019 /* If _EVENT_MAX ever hits 0x0020, we need to make the mask wider. */ /** Bitfield: The bit 1<<e is set if any open control * connection is interested in events of type e. We use this * so that we can decide to skip generating event messages that nobody * has interest in without having to walk over the global connection * list to find out. **/ typedef uint32_t event_mask_t; /** An event mask of all the events that any controller is interested in * receiving. */ static event_mask_t global_event_mask = 0; /** True iff we have disabled log messages from being sent to the controller */ static int disable_log_messages = 0; /** Macro: true if any control connection is interested in events of type * e. */ #define EVENT_IS_INTERESTING(e) \ (global_event_mask & (1<<(e))) /** If we're using cookie-type authentication, how long should our cookies be? */ #define AUTHENTICATION_COOKIE_LEN 32 /** If true, we've set authentication_cookie to a secret code and * stored it to disk. */ static int authentication_cookie_is_set = 0; /** If authentication_cookie_is_set, a secret cookie that we've stored to disk * and which we're using to authenticate controllers. (If the controller can * read it off disk, it has permission to connect.) */ static char authentication_cookie[AUTHENTICATION_COOKIE_LEN]; /** A sufficiently large size to record the last bootstrap phase string. */ #define BOOTSTRAP_MSG_LEN 1024 /** What was the last bootstrap phase message we sent? We keep track * of this so we can respond to getinfo status/bootstrap-phase queries. */ static char last_sent_bootstrap_message[BOOTSTRAP_MSG_LEN]; /** Flag for event_format_t. Indicates that we should use the one standard format. */ #define ALL_FORMATS 1 /** Bit field of flags to select how to format a controller event. Recognized * flag is ALL_FORMATS. */ typedef int event_format_t; static void connection_printf_to_buf(control_connection_t *conn, const char *format, ...) CHECK_PRINTF(2,3); static void send_control_done(control_connection_t *conn); static void send_control_event(uint16_t event, event_format_t which, const char *format, ...) CHECK_PRINTF(3,4); static int handle_control_setconf(control_connection_t *conn, uint32_t len, char *body); static int handle_control_resetconf(control_connection_t *conn, uint32_t len, char *body); static int handle_control_getconf(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_loadconf(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_setevents(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_authenticate(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_signal(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_mapaddress(control_connection_t *conn, uint32_t len, const char *body); static char *list_getinfo_options(void); static int handle_control_getinfo(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_extendcircuit(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_setcircuitpurpose(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_attachstream(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_postdescriptor(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_redirectstream(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_closestream(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_closecircuit(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_resolve(control_connection_t *conn, uint32_t len, const char *body); static int handle_control_usefeature(control_connection_t *conn, uint32_t len, const char *body); static int write_stream_target_to_buf(entry_connection_t *conn, char *buf, size_t len); static void orconn_target_get_name(char *buf, size_t len, or_connection_t *conn); static char *get_cookie_file(void); /** Given a control event code for a message event, return the corresponding * log severity. */ static INLINE int event_to_log_severity(int event) { switch (event) { case EVENT_DEBUG_MSG: return LOG_DEBUG; case EVENT_INFO_MSG: return LOG_INFO; case EVENT_NOTICE_MSG: return LOG_NOTICE; case EVENT_WARN_MSG: return LOG_WARN; case EVENT_ERR_MSG: return LOG_ERR; default: return -1; } } /** Given a log severity, return the corresponding control event code. */ static INLINE int log_severity_to_event(int severity) { switch (severity) { case LOG_DEBUG: return EVENT_DEBUG_MSG; case LOG_INFO: return EVENT_INFO_MSG; case LOG_NOTICE: return EVENT_NOTICE_MSG; case LOG_WARN: return EVENT_WARN_MSG; case LOG_ERR: return EVENT_ERR_MSG; default: return -1; } } /** Set global_event_mask* to the bitwise OR of each live control * connection's event_mask field. */ void control_update_global_event_mask(void) { smartlist_t *conns = get_connection_array(); event_mask_t old_mask, new_mask; old_mask = global_event_mask; global_event_mask = 0; SMARTLIST_FOREACH(conns, connection_t *, _conn, { if (_conn->type == CONN_TYPE_CONTROL && STATE_IS_OPEN(_conn->state)) { control_connection_t *conn = TO_CONTROL_CONN(_conn); global_event_mask |= conn->event_mask; } }); new_mask = global_event_mask; /* Handle the aftermath. Set up the log callback to tell us only what * we want to hear...*/ control_adjust_event_log_severity(); /* ...then, if we've started logging stream bw, clear the appropriate * fields. */ if (! (old_mask & EVENT_STREAM_BANDWIDTH_USED) && (new_mask & EVENT_STREAM_BANDWIDTH_USED)) { SMARTLIST_FOREACH(conns, connection_t *, conn, { if (conn->type == CONN_TYPE_AP) { edge_connection_t *edge_conn = TO_EDGE_CONN(conn); edge_conn->n_written = edge_conn->n_read = 0; } }); } } /** Adjust the log severities that result in control_event_logmsg being called * to match the severity of log messages that any controllers are interested * in. */ void control_adjust_event_log_severity(void) { int i; int min_log_event=EVENT_ERR_MSG, max_log_event=EVENT_DEBUG_MSG; for (i = EVENT_DEBUG_MSG; i <= EVENT_ERR_MSG; ++i) { if (EVENT_IS_INTERESTING(i)) { min_log_event = i; break; } } for (i = EVENT_ERR_MSG; i >= EVENT_DEBUG_MSG; --i) { if (EVENT_IS_INTERESTING(i)) { max_log_event = i; break; } } if (EVENT_IS_INTERESTING(EVENT_LOG_OBSOLETE) || EVENT_IS_INTERESTING(EVENT_STATUS_GENERAL)) { if (min_log_event > EVENT_NOTICE_MSG) min_log_event = EVENT_NOTICE_MSG; if (max_log_event < EVENT_ERR_MSG) max_log_event = EVENT_ERR_MSG; } if (min_log_event <= max_log_event) change_callback_log_severity(event_to_log_severity(min_log_event), event_to_log_severity(max_log_event), control_event_logmsg); else change_callback_log_severity(LOG_ERR, LOG_ERR, control_event_logmsg); } /** Return true iff the event with code c is being sent to any current * control connection. This is useful if the amount of work needed to prepare * to call the appropriate control_event_...() function is high. */ int control_event_is_interesting(int event) { return EVENT_IS_INTERESTING(event); } /** Append a NUL-terminated string s to the end of * conn-\>outbuf. */ static INLINE void connection_write_str_to_buf(const char *s, control_connection_t *conn) { size_t len = strlen(s); connection_write_to_buf(s, len, TO_CONN(conn)); } /** Given a len-character string in data, made of lines * terminated by CRLF, allocate a new string in *out, and copy the * contents of data into *out, adding a period before any period * that appears at the start of a line, and adding a period-CRLF line at * the end. Replace all LF characters sequences with CRLF. Return the number * of bytes in *out. */ /* static */ size_t write_escaped_data(const char *data, size_t len, char **out) { size_t sz_out = len+8; char *outp; const char *start = data, *end; int i; int start_of_line; for (i=0; i<(int)len; ++i) { if (data[i]== '\n') sz_out += 2; /* Maybe add a CR; maybe add a dot. */ } *out = outp = tor_malloc(sz_out+1); end = data+len; start_of_line = 1; while (data < end) { if (*data == '\n') { if (data > start && data[-1] != '\r') *outp++ = '\r'; start_of_line = 1; } else if (*data == '.') { if (start_of_line) { start_of_line = 0; *outp++ = '.'; } } else { start_of_line = 0; } *outp++ = *data++; } if (outp < *out+2 || fast_memcmp(outp-2, "\r\n", 2)) { *outp++ = '\r'; *outp++ = '\n'; } *outp++ = '.'; *outp++ = '\r'; *outp++ = '\n'; *outp = '\0'; /* NUL-terminate just in case. */ tor_assert((outp - *out) <= (int)sz_out); return outp - *out; } /** Given a len-character string in data, made of lines * terminated by CRLF, allocate a new string in *out, and copy * the contents of data into *out, removing any period * that appears at the start of a line, and replacing all CRLF sequences * with LF. Return the number of * bytes in *out. */ /* static */ size_t read_escaped_data(const char *data, size_t len, char **out) { char *outp; const char *next; const char *end; *out = outp = tor_malloc(len+1); end = data+len; while (data < end) { /* we're at the start of a line. */ if (*data == '.') ++data; next = memchr(data, '\n', end-data); if (next) { size_t n_to_copy = next-data; /* Don't copy a CR that precedes this LF. */ if (n_to_copy && *(next-1) == '\r') --n_to_copy; memcpy(outp, data, n_to_copy); outp += n_to_copy; data = next+1; /* This will point at the start of the next line, * or the end of the string, or a period. */ } else { memcpy(outp, data, end-data); outp += (end-data); *outp = '\0'; return outp - *out; } *outp++ = '\n'; } *outp = '\0'; return outp - *out; } /** If the first in_len_max characters in start contain a * double-quoted string with escaped characters, return the length of that * string (as encoded, including quotes). Otherwise return -1. */ static INLINE int get_escaped_string_length(const char *start, size_t in_len_max, int *chars_out) { const char *cp, *end; int chars = 0; if (*start != '\"') return -1; cp = start+1; end = start+in_len_max; /* Calculate length. */ while (1) { if (cp >= end) { return -1; /* Too long. */ } else if (*cp == '\\') { if (++cp == end) return -1; /* Can't escape EOS. */ ++cp; ++chars; } else if (*cp == '\"') { break; } else { ++cp; ++chars; } } if (chars_out) *chars_out = chars; return (int)(cp - start+1); } /** As decode_escaped_string, but does not decode the string: copies the * entire thing, including quotation marks. */ static const char * extract_escaped_string(const char *start, size_t in_len_max, char **out, size_t *out_len) { int length = get_escaped_string_length(start, in_len_max, NULL); if (length<0) return NULL; *out_len = length; *out = tor_strndup(start, *out_len); return start+length; } /** Given a pointer to a string starting at start containing * in_len_max characters, decode a string beginning with one double * quote, containing any number of non-quote characters or characters escaped * with a backslash, and ending with a final double quote. Place the resulting * string (unquoted, unescaped) into a newly allocated string in *out; * store its length in out_len. On success, return a pointer to the * character immediately following the escaped string. On failure, return * NULL. */ static const char * decode_escaped_string(const char *start, size_t in_len_max, char **out, size_t *out_len) { const char *cp, *end; char *outp; int len, n_chars = 0; len = get_escaped_string_length(start, in_len_max, &n_chars); if (len<0) return NULL; end = start+len-1; /* Index of last quote. */ tor_assert(*end == '\"'); outp = *out = tor_malloc(len+1); *out_len = n_chars; cp = start+1; while (cp < end) { if (*cp == '\\') ++cp; *outp++ = *cp++; } *outp = '\0'; tor_assert((outp - *out) == (int)*out_len); return end+1; } /** Acts like sprintf, but writes its formatted string to the end of * conn-\>outbuf. */ static void connection_printf_to_buf(control_connection_t *conn, const char *format, ...) { va_list ap; char *buf = NULL; int len; va_start(ap,format); len = tor_vasprintf(&buf, format, ap); va_end(ap); if (len < 0) { log_err(LD_BUG, "Unable to format string for controller."); tor_assert(0); } connection_write_to_buf(buf, (size_t)len, TO_CONN(conn)); tor_free(buf); } /** Write all of the open control ports to ControlPortWriteToFile */ void control_ports_write_to_file(void) { smartlist_t *lines; char *joined = NULL; const or_options_t *options = get_options(); if (!options->ControlPortWriteToFile) return; lines = smartlist_create(); SMARTLIST_FOREACH_BEGIN(get_connection_array(), const connection_t *, conn) { char *port_str = NULL; if (conn->type != CONN_TYPE_CONTROL_LISTENER || conn->marked_for_close) continue; #ifdef AF_UNIX if (conn->socket_family == AF_UNIX) { tor_asprintf(&port_str, "UNIX_PORT=%s\n", conn->address); smartlist_add(lines, port_str); continue; } #endif tor_asprintf(&port_str, "PORT=%s:%d\n", conn->address, conn->port); smartlist_add(lines, port_str); } SMARTLIST_FOREACH_END(conn); joined = smartlist_join_strings(lines, "", 0, NULL); if (write_str_to_file(options->ControlPortWriteToFile, joined, 0) < 0) { log_warn(LD_CONTROL, "Writing %s failed: %s", options->ControlPortWriteToFile, strerror(errno)); } #ifndef MS_WINDOWS if (options->ControlPortFileGroupReadable) { if (chmod(options->ControlPortWriteToFile, 0640)) { log_warn(LD_FS,"Unable to make %s group-readable.", options->ControlPortWriteToFile); } } #endif tor_free(joined); SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp)); smartlist_free(lines); } /** Send a "DONE" message down the control connection conn. */ static void send_control_done(control_connection_t *conn) { connection_write_str_to_buf("250 OK\r\n", conn); } /** Send an event to all v1 controllers that are listening for code * event. The event's body is given by msg. * * If which & SHORT_NAMES, the event contains short-format names: send * it to controllers that haven't enabled the VERBOSE_NAMES feature. If * which & LONG_NAMES, the event contains long-format names: send it * to controllers that have enabled VERBOSE_NAMES. * * The EXTENDED_FORMAT and NONEXTENDED_FORMAT flags behave similarly with * respect to the EXTENDED_EVENTS feature. */ static void send_control_event_string(uint16_t event, event_format_t which, const char *msg) { smartlist_t *conns = get_connection_array(); (void)which; tor_assert(event >= _EVENT_MIN && event <= _EVENT_MAX); SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) { if (conn->type == CONN_TYPE_CONTROL && !conn->marked_for_close && conn->state == CONTROL_CONN_STATE_OPEN) { control_connection_t *control_conn = TO_CONTROL_CONN(conn); if (control_conn->event_mask & (1<event. The event's body is created by the printf-style format in * format, and other arguments as provided. */ static void send_control_event_impl(uint16_t event, event_format_t which, const char *format, va_list ap) { char *buf = NULL; int len; len = tor_vasprintf(&buf, format, ap); if (len < 0) { log_warn(LD_BUG, "Unable to format event for controller."); return; } send_control_event_string(event, which|ALL_FORMATS, buf); tor_free(buf); } /** Send an event to all v1 controllers that are listening for code * event. The event's body is created by the printf-style format in * format, and other arguments as provided. */ static void send_control_event(uint16_t event, event_format_t which, const char *format, ...) { va_list ap; va_start(ap, format); send_control_event_impl(event, which, format, ap); va_end(ap); } /** Given a text circuit id, return the corresponding circuit. */ static origin_circuit_t * get_circ(const char *id) { uint32_t n_id; int ok; n_id = (uint32_t) tor_parse_ulong(id, 10, 0, UINT32_MAX, &ok, NULL); if (!ok) return NULL; return circuit_get_by_global_id(n_id); } /** Given a text stream id, return the corresponding AP connection. */ static entry_connection_t * get_stream(const char *id) { uint64_t n_id; int ok; connection_t *conn; n_id = tor_parse_uint64(id, 10, 0, UINT64_MAX, &ok, NULL); if (!ok) return NULL; conn = connection_get_by_global_id(n_id); if (!conn || conn->type != CONN_TYPE_AP || conn->marked_for_close) return NULL; return TO_ENTRY_CONN(conn); } /** Helper for setconf and resetconf. Acts like setconf, except * it passes use_defaults on to options_trial_assign(). Modifies the * contents of body. */ static int control_setconf_helper(control_connection_t *conn, uint32_t len, char *body, int use_defaults) { setopt_err_t opt_err; config_line_t *lines=NULL; char *start = body; char *errstring = NULL; const int clear_first = 1; char *config; smartlist_t *entries = smartlist_create(); /* We have a string, "body", of the format '(key(=val|="val")?)' entries * separated by space. break it into a list of configuration entries. */ while (*body) { char *eq = body; char *key; char *entry; while (!TOR_ISSPACE(*eq) && *eq != '=') ++eq; key = tor_strndup(body, eq-body); body = eq+1; if (*eq == '=') { char *val=NULL; size_t val_len=0; size_t ent_len; if (*body != '\"') { char *val_start = body; while (!TOR_ISSPACE(*body)) body++; val = tor_strndup(val_start, body-val_start); val_len = strlen(val); } else { body = (char*)extract_escaped_string(body, (len - (body-start)), &val, &val_len); if (!body) { connection_write_str_to_buf("551 Couldn't parse string\r\n", conn); SMARTLIST_FOREACH(entries, char *, cp, tor_free(cp)); smartlist_free(entries); tor_free(key); return 0; } } ent_len = strlen(key)+val_len+3; entry = tor_malloc(ent_len+1); tor_snprintf(entry, ent_len, "%s %s", key, val); tor_free(key); tor_free(val); } else { entry = key; } smartlist_add(entries, entry); while (TOR_ISSPACE(*body)) ++body; } smartlist_add(entries, tor_strdup("")); config = smartlist_join_strings(entries, "\n", 0, NULL); SMARTLIST_FOREACH(entries, char *, cp, tor_free(cp)); smartlist_free(entries); if (config_get_lines(config, &lines) < 0) { log_warn(LD_CONTROL,"Controller gave us config lines we can't parse."); connection_write_str_to_buf("551 Couldn't parse configuration\r\n", conn); tor_free(config); return 0; } tor_free(config); opt_err = options_trial_assign(lines, use_defaults, clear_first, &errstring); { const char *msg; switch (opt_err) { case SETOPT_ERR_MISC: msg = "552 Unrecognized option"; break; case SETOPT_ERR_PARSE: msg = "513 Unacceptable option value"; break; case SETOPT_ERR_TRANSITION: msg = "553 Transition not allowed"; break; case SETOPT_ERR_SETTING: default: msg = "553 Unable to set option"; break; case SETOPT_OK: config_free_lines(lines); send_control_done(conn); return 0; } log_warn(LD_CONTROL, "Controller gave us config lines that didn't validate: %s", errstring); connection_printf_to_buf(conn, "%s: %s\r\n", msg, errstring); config_free_lines(lines); tor_free(errstring); return 0; } } /** Called when we receive a SETCONF message: parse the body and try * to update our configuration. Reply with a DONE or ERROR message. * Modifies the contents of body.*/ static int handle_control_setconf(control_connection_t *conn, uint32_t len, char *body) { return control_setconf_helper(conn, len, body, 0); } /** Called when we receive a RESETCONF message: parse the body and try * to update our configuration. Reply with a DONE or ERROR message. * Modifies the contents of body. */ static int handle_control_resetconf(control_connection_t *conn, uint32_t len, char *body) { return control_setconf_helper(conn, len, body, 1); } /** Called when we receive a GETCONF message. Parse the request, and * reply with a CONFVALUE or an ERROR message */ static int handle_control_getconf(control_connection_t *conn, uint32_t body_len, const char *body) { smartlist_t *questions = smartlist_create(); smartlist_t *answers = smartlist_create(); smartlist_t *unrecognized = smartlist_create(); char *msg = NULL; size_t msg_len; const or_options_t *options = get_options(); int i, len; (void) body_len; /* body is NUL-terminated; so we can ignore len. */ smartlist_split_string(questions, body, " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); SMARTLIST_FOREACH(questions, const char *, q, { if (!option_is_recognized(q)) { smartlist_add(unrecognized, (char*) q); } else { config_line_t *answer = option_get_assignment(options,q); if (!answer) { const char *name = option_get_canonical_name(q); size_t alen = strlen(name)+8; char *astr = tor_malloc(alen); tor_snprintf(astr, alen, "250-%s\r\n", name); smartlist_add(answers, astr); } while (answer) { config_line_t *next; size_t alen = strlen(answer->key)+strlen(answer->value)+8; char *astr = tor_malloc(alen); tor_snprintf(astr, alen, "250-%s=%s\r\n", answer->key, answer->value); smartlist_add(answers, astr); next = answer->next; tor_free(answer->key); tor_free(answer->value); tor_free(answer); answer = next; } } }); if ((len = smartlist_len(unrecognized))) { for (i=0; i < len-1; ++i) connection_printf_to_buf(conn, "552-Unrecognized configuration key \"%s\"\r\n", (char*)smartlist_get(unrecognized, i)); connection_printf_to_buf(conn, "552 Unrecognized configuration key \"%s\"\r\n", (char*)smartlist_get(unrecognized, len-1)); } else if ((len = smartlist_len(answers))) { char *tmp = smartlist_get(answers, len-1); tor_assert(strlen(tmp)>4); tmp[3] = ' '; msg = smartlist_join_strings(answers, "", 0, &msg_len); connection_write_to_buf(msg, msg_len, TO_CONN(conn)); } else { connection_write_str_to_buf("250 OK\r\n", conn); } SMARTLIST_FOREACH(answers, char *, cp, tor_free(cp)); smartlist_free(answers); SMARTLIST_FOREACH(questions, char *, cp, tor_free(cp)); smartlist_free(questions); smartlist_free(unrecognized); tor_free(msg); return 0; } /** Called when we get a +LOADCONF message. */ static int handle_control_loadconf(control_connection_t *conn, uint32_t len, const char *body) { setopt_err_t retval; char *errstring = NULL; const char *msg = NULL; (void) len; retval = options_init_from_string(body, CMD_RUN_TOR, NULL, &errstring); if (retval != SETOPT_OK) log_warn(LD_CONTROL, "Controller gave us config file that didn't validate: %s", errstring); switch (retval) { case SETOPT_ERR_PARSE: msg = "552 Invalid config file"; break; case SETOPT_ERR_TRANSITION: msg = "553 Transition not allowed"; break; case SETOPT_ERR_SETTING: msg = "553 Unable to set option"; break; case SETOPT_ERR_MISC: default: msg = "550 Unable to load config"; break; case SETOPT_OK: break; } if (msg) { if (errstring) connection_printf_to_buf(conn, "%s: %s\r\n", msg, errstring); else connection_printf_to_buf(conn, "%s\r\n", msg); } else { send_control_done(conn); } tor_free(errstring); return 0; } struct control_event_t { uint16_t event_code; const char *event_name; }; static const struct control_event_t control_event_table[] = { { EVENT_CIRCUIT_STATUS, "CIRC" }, { EVENT_STREAM_STATUS, "STREAM" }, { EVENT_OR_CONN_STATUS, "ORCONN" }, { EVENT_BANDWIDTH_USED, "BW" }, { EVENT_DEBUG_MSG, "DEBUG" }, { EVENT_INFO_MSG, "INFO" }, { EVENT_NOTICE_MSG, "NOTICE" }, { EVENT_WARN_MSG, "WARN" }, { EVENT_ERR_MSG, "ERR" }, { EVENT_NEW_DESC, "NEWDESC" }, { EVENT_ADDRMAP, "ADDRMAP" }, { EVENT_AUTHDIR_NEWDESCS, "AUTHDIR_NEWDESCS" }, { EVENT_DESCCHANGED, "DESCCHANGED" }, { EVENT_NS, "NS" }, { EVENT_STATUS_GENERAL, "STATUS_GENERAL" }, { EVENT_STATUS_CLIENT, "STATUS_CLIENT" }, { EVENT_STATUS_SERVER, "STATUS_SERVER" }, { EVENT_GUARD, "GUARD" }, { EVENT_STREAM_BANDWIDTH_USED, "STREAM_BW" }, { EVENT_CLIENTS_SEEN, "CLIENTS_SEEN" }, { EVENT_NEWCONSENSUS, "NEWCONSENSUS" }, { EVENT_BUILDTIMEOUT_SET, "BUILDTIMEOUT_SET" }, { EVENT_SIGNAL, "SIGNAL" }, { EVENT_CONF_CHANGED, "CONF_CHANGED"}, { 0, NULL }, }; /** Called when we get a SETEVENTS message: update conn->event_mask, * and reply with DONE or ERROR. */ static int handle_control_setevents(control_connection_t *conn, uint32_t len, const char *body) { int event_code = -1; uint32_t event_mask = 0; smartlist_t *events = smartlist_create(); (void) len; smartlist_split_string(events, body, " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); SMARTLIST_FOREACH_BEGIN(events, const char *, ev) { if (!strcasecmp(ev, "EXTENDED")) { continue; } else { int i; for (i = 0; control_event_table[i].event_name != NULL; ++i) { if (!strcasecmp(ev, control_event_table[i].event_name)) { event_code = control_event_table[i].event_code; break; } } if (event_code == -1) { connection_printf_to_buf(conn, "552 Unrecognized event \"%s\"\r\n", ev); SMARTLIST_FOREACH(events, char *, e, tor_free(e)); smartlist_free(events); return 0; } } event_mask |= (1 << event_code); } SMARTLIST_FOREACH_END(ev); SMARTLIST_FOREACH(events, char *, e, tor_free(e)); smartlist_free(events); conn->event_mask = event_mask; control_update_global_event_mask(); send_control_done(conn); return 0; } /** Decode the hashed, base64'd passwords stored in passwords. * Return a smartlist of acceptable passwords (unterminated strings of * length S2K_SPECIFIER_LEN+DIGEST_LEN) on success, or NULL on failure. */ smartlist_t * decode_hashed_passwords(config_line_t *passwords) { char decoded[64]; config_line_t *cl; smartlist_t *sl = smartlist_create(); tor_assert(passwords); for (cl = passwords; cl; cl = cl->next) { const char *hashed = cl->value; if (!strcmpstart(hashed, "16:")) { if (base16_decode(decoded, sizeof(decoded), hashed+3, strlen(hashed+3))<0 || strlen(hashed+3) != (S2K_SPECIFIER_LEN+DIGEST_LEN)*2) { goto err; } } else { if (base64_decode(decoded, sizeof(decoded), hashed, strlen(hashed)) != S2K_SPECIFIER_LEN+DIGEST_LEN) { goto err; } } smartlist_add(sl, tor_memdup(decoded, S2K_SPECIFIER_LEN+DIGEST_LEN)); } return sl; err: SMARTLIST_FOREACH(sl, char*, cp, tor_free(cp)); smartlist_free(sl); return NULL; } /** Called when we get an AUTHENTICATE message. Check whether the * authentication is valid, and if so, update the connection's state to * OPEN. Reply with DONE or ERROR. */ static int handle_control_authenticate(control_connection_t *conn, uint32_t len, const char *body) { int used_quoted_string = 0; const or_options_t *options = get_options(); const char *errstr = NULL; char *password; size_t password_len; const char *cp; int i; int bad_cookie=0, bad_password=0; smartlist_t *sl = NULL; if (TOR_ISXDIGIT(body[0])) { cp = body; while (TOR_ISXDIGIT(*cp)) ++cp; i = (int)(cp - body); tor_assert(i>0); password_len = i/2; password = tor_malloc(password_len + 1); if (base16_decode(password, password_len+1, body, i)<0) { connection_write_str_to_buf( "551 Invalid hexadecimal encoding. Maybe you tried a plain text " "password? If so, the standard requires that you put it in " "double quotes.\r\n", conn); connection_mark_for_close(TO_CONN(conn)); tor_free(password); return 0; } } else if (TOR_ISSPACE(body[0])) { password = tor_strdup(""); password_len = 0; } else { if (!decode_escaped_string(body, len, &password, &password_len)) { connection_write_str_to_buf("551 Invalid quoted string. You need " "to put the password in double quotes.\r\n", conn); connection_mark_for_close(TO_CONN(conn)); return 0; } used_quoted_string = 1; } if (!options->CookieAuthentication && !options->HashedControlPassword && !options->HashedControlSessionPassword) { /* if Tor doesn't demand any stronger authentication, then * the controller can get in with anything. */ goto ok; } if (options->CookieAuthentication) { int also_password = options->HashedControlPassword != NULL || options->HashedControlSessionPassword != NULL; if (password_len != AUTHENTICATION_COOKIE_LEN) { if (!also_password) { log_warn(LD_CONTROL, "Got authentication cookie with wrong length " "(%d)", (int)password_len); errstr = "Wrong length on authentication cookie."; goto err; } bad_cookie = 1; } else if (tor_memneq(authentication_cookie, password, password_len)) { if (!also_password) { log_warn(LD_CONTROL, "Got mismatched authentication cookie"); errstr = "Authentication cookie did not match expected value."; goto err; } bad_cookie = 1; } else { goto ok; } } if (options->HashedControlPassword || options->HashedControlSessionPassword) { int bad = 0; smartlist_t *sl_tmp; char received[DIGEST_LEN]; int also_cookie = options->CookieAuthentication; sl = smartlist_create(); if (options->HashedControlPassword) { sl_tmp = decode_hashed_passwords(options->HashedControlPassword); if (!sl_tmp) bad = 1; else { smartlist_add_all(sl, sl_tmp); smartlist_free(sl_tmp); } } if (options->HashedControlSessionPassword) { sl_tmp = decode_hashed_passwords(options->HashedControlSessionPassword); if (!sl_tmp) bad = 1; else { smartlist_add_all(sl, sl_tmp); smartlist_free(sl_tmp); } } if (bad) { if (!also_cookie) { log_warn(LD_CONTROL, "Couldn't decode HashedControlPassword: invalid base16"); errstr="Couldn't decode HashedControlPassword value in configuration."; } bad_password = 1; SMARTLIST_FOREACH(sl, char *, cp, tor_free(cp)); smartlist_free(sl); } else { SMARTLIST_FOREACH(sl, char *, expected, { secret_to_key(received,DIGEST_LEN,password,password_len,expected); if (tor_memeq(expected+S2K_SPECIFIER_LEN, received, DIGEST_LEN)) goto ok; }); SMARTLIST_FOREACH(sl, char *, cp, tor_free(cp)); smartlist_free(sl); if (used_quoted_string) errstr = "Password did not match HashedControlPassword value from " "configuration"; else errstr = "Password did not match HashedControlPassword value from " "configuration. Maybe you tried a plain text password? " "If so, the standard requires that you put it in double quotes."; bad_password = 1; if (!also_cookie) goto err; } } /** We only get here if both kinds of authentication failed. */ tor_assert(bad_password && bad_cookie); log_warn(LD_CONTROL, "Bad password or authentication cookie on controller."); errstr = "Password did not match HashedControlPassword *or* authentication " "cookie."; err: tor_free(password); connection_printf_to_buf(conn, "515 Authentication failed: %s\r\n", errstr ? errstr : "Unknown reason."); connection_mark_for_close(TO_CONN(conn)); return 0; ok: log_info(LD_CONTROL, "Authenticated control connection (%d)", conn->_base.s); send_control_done(conn); conn->_base.state = CONTROL_CONN_STATE_OPEN; tor_free(password); if (sl) { /* clean up */ SMARTLIST_FOREACH(sl, char *, cp, tor_free(cp)); smartlist_free(sl); } return 0; } /** Called when we get a SAVECONF command. Try to flush the current options to * disk, and report success or failure. */ static int handle_control_saveconf(control_connection_t *conn, uint32_t len, const char *body) { (void) len; (void) body; if (options_save_current()<0) { connection_write_str_to_buf( "551 Unable to write configuration to disk.\r\n", conn); } else { send_control_done(conn); } return 0; } /** Called when we get a SIGNAL command. React to the provided signal, and * report success or failure. (If the signal results in a shutdown, success * may not be reported.) */ static int handle_control_signal(control_connection_t *conn, uint32_t len, const char *body) { int sig; int n = 0; char *s; (void) len; while (body[n] && ! TOR_ISSPACE(body[n])) ++n; s = tor_strndup(body, n); if (!strcasecmp(s, "RELOAD") || !strcasecmp(s, "HUP")) sig = SIGHUP; else if (!strcasecmp(s, "SHUTDOWN") || !strcasecmp(s, "INT")) sig = SIGINT; else if (!strcasecmp(s, "DUMP") || !strcasecmp(s, "USR1")) sig = SIGUSR1; else if (!strcasecmp(s, "DEBUG") || !strcasecmp(s, "USR2")) sig = SIGUSR2; else if (!strcasecmp(s, "HALT") || !strcasecmp(s, "TERM")) sig = SIGTERM; else if (!strcasecmp(s, "NEWNYM")) sig = SIGNEWNYM; else if (!strcasecmp(s, "CLEARDNSCACHE")) sig = SIGCLEARDNSCACHE; else { connection_printf_to_buf(conn, "552 Unrecognized signal code \"%s\"\r\n", s); sig = -1; } tor_free(s); if (sig<0) return 0; send_control_done(conn); /* Flush the "done" first if the signal might make us shut down. */ if (sig == SIGTERM || sig == SIGINT) connection_flush(TO_CONN(conn)); process_signal(sig); return 0; } /** Called when we get a TAKEOWNERSHIP command. Mark this connection * as an owning connection, so that we will exit if the connection * closes. */ static int handle_control_takeownership(control_connection_t *conn, uint32_t len, const char *body) { (void)len; (void)body; conn->is_owning_control_connection = 1; log_info(LD_CONTROL, "Control connection %d has taken ownership of this " "Tor instance.", (int)(conn->_base.s)); send_control_done(conn); return 0; } /** Called when we get a MAPADDRESS command; try to bind all listed addresses, * and report success or failure. */ static int handle_control_mapaddress(control_connection_t *conn, uint32_t len, const char *body) { smartlist_t *elts; smartlist_t *lines; smartlist_t *reply; char *r; size_t sz; (void) len; /* body is NUL-terminated, so it's safe to ignore the length. */ lines = smartlist_create(); elts = smartlist_create(); reply = smartlist_create(); smartlist_split_string(lines, body, " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); SMARTLIST_FOREACH(lines, char *, line, { tor_strlower(line); smartlist_split_string(elts, line, "=", 0, 2); if (smartlist_len(elts) == 2) { const char *from = smartlist_get(elts,0); const char *to = smartlist_get(elts,1); size_t anslen = strlen(line)+512; char *ans = tor_malloc(anslen); if (address_is_invalid_destination(to, 1)) { tor_snprintf(ans, anslen, "512-syntax error: invalid address '%s'", to); smartlist_add(reply, ans); log_warn(LD_CONTROL, "Skipping invalid argument '%s' in MapAddress msg", to); } else if (!strcmp(from, ".") || !strcmp(from, "0.0.0.0")) { const char *address = addressmap_register_virtual_address( !strcmp(from,".") ? RESOLVED_TYPE_HOSTNAME : RESOLVED_TYPE_IPV4, tor_strdup(to)); if (!address) { tor_snprintf(ans, anslen, "451-resource exhausted: skipping '%s'", line); smartlist_add(reply, ans); log_warn(LD_CONTROL, "Unable to allocate address for '%s' in MapAddress msg", safe_str_client(line)); } else { tor_snprintf(ans, anslen, "250-%s=%s", address, to); smartlist_add(reply, ans); } } else { addressmap_register(from, tor_strdup(to), 1, ADDRMAPSRC_CONTROLLER); tor_snprintf(ans, anslen, "250-%s", line); smartlist_add(reply, ans); } } else { size_t anslen = strlen(line)+256; char *ans = tor_malloc(anslen); tor_snprintf(ans, anslen, "512-syntax error: mapping '%s' is " "not of expected form 'foo=bar'.", line); smartlist_add(reply, ans); log_info(LD_CONTROL, "Skipping MapAddress '%s': wrong " "number of items.", safe_str_client(line)); } SMARTLIST_FOREACH(elts, char *, cp, tor_free(cp)); smartlist_clear(elts); }); SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp)); smartlist_free(lines); smartlist_free(elts); if (smartlist_len(reply)) { ((char*)smartlist_get(reply,smartlist_len(reply)-1))[3] = ' '; r = smartlist_join_strings(reply, "\r\n", 1, &sz); connection_write_to_buf(r, sz, TO_CONN(conn)); tor_free(r); } else { const char *response = "512 syntax error: not enough arguments to mapaddress.\r\n"; connection_write_to_buf(response, strlen(response), TO_CONN(conn)); } SMARTLIST_FOREACH(reply, char *, cp, tor_free(cp)); smartlist_free(reply); return 0; } /** Implementation helper for GETINFO: knows the answers for various * trivial-to-implement questions. */ static int getinfo_helper_misc(control_connection_t *conn, const char *question, char **answer, const char **errmsg) { (void) conn; if (!strcmp(question, "version")) { *answer = tor_strdup(get_version()); } else if (!strcmp(question, "config-file")) { *answer = tor_strdup(get_torrc_fname()); } else if (!strcmp(question, "config-text")) { *answer = options_dump(get_options(), 1); } else if (!strcmp(question, "info/names")) { *answer = list_getinfo_options(); } else if (!strcmp(question, "events/names")) { int i; smartlist_t *event_names = smartlist_create(); for (i = 0; control_event_table[i].event_name != NULL; ++i) { smartlist_add(event_names, (char *)control_event_table[i].event_name); } *answer = smartlist_join_strings(event_names, " ", 0, NULL); smartlist_free(event_names); } else if (!strcmp(question, "features/names")) { *answer = tor_strdup("VERBOSE_NAMES EXTENDED_EVENTS"); } else if (!strcmp(question, "address")) { uint32_t addr; if (router_pick_published_address(get_options(), &addr) < 0) { *errmsg = "Address unknown"; return -1; } *answer = tor_dup_ip(addr); } else if (!strcmp(question, "traffic/read")) { tor_asprintf(answer, U64_FORMAT, U64_PRINTF_ARG(get_bytes_read())); } else if (!strcmp(question, "traffic/written")) { tor_asprintf(answer, U64_FORMAT, U64_PRINTF_ARG(get_bytes_written())); } else if (!strcmp(question, "process/pid")) { int myPid = -1; #ifdef MS_WINDOWS myPid = _getpid(); #else myPid = getpid(); #endif tor_asprintf(answer, "%d", myPid); } else if (!strcmp(question, "process/uid")) { #ifdef MS_WINDOWS *answer = tor_strdup("-1"); #else int myUid = geteuid(); tor_asprintf(answer, "%d", myUid); #endif } else if (!strcmp(question, "process/user")) { #ifdef MS_WINDOWS *answer = tor_strdup(""); #else int myUid = geteuid(); struct passwd *myPwEntry = getpwuid(myUid); if (myPwEntry) { *answer = tor_strdup(myPwEntry->pw_name); } else { *answer = tor_strdup(""); } #endif } else if (!strcmp(question, "process/descriptor-limit")) { /** platform specifc limits are from the set_max_file_descriptors function * of src/common/compat.c */ /* XXXX023 This is duplicated code from compat.c; it should turn into a * function. */ #ifdef HAVE_GETRLIMIT struct rlimit descriptorLimit; if (getrlimit(RLIMIT_NOFILE, &descriptorLimit) == 0) { tor_asprintf(answer, U64_FORMAT, U64_PRINTF_ARG(descriptorLimit.rlim_max)); } else { *answer = tor_strdup("-1"); } #elif defined(CYGWIN) || defined(__CYGWIN__) *answer = tor_strdup("3200"); #elif defined(MS_WINDOWS) *answer = tor_strdup("15000"); #else *answer = tor_strdup("15000"); #endif } else if (!strcmp(question, "dir-usage")) { *answer = directory_dump_request_log(); } else if (!strcmp(question, "fingerprint")) { crypto_pk_env_t *server_key; if (!server_mode(get_options())) { *errmsg = "Not running in server mode"; return -1; } server_key = get_server_identity_key(); *answer = tor_malloc(HEX_DIGEST_LEN+1); crypto_pk_get_fingerprint(server_key, *answer, 0); } return 0; } /** Awful hack: return a newly allocated string based on a routerinfo and * (possibly) an extrainfo, sticking the read-history and write-history from * ei into the resulting string. The thing you get back won't * necessarily have a valid signature. * * New code should never use this; it's for backward compatibility. * * NOTE: ri_body is as returned by signed_descriptor_get_body: it might * not be NUL-terminated. */ static char * munge_extrainfo_into_routerinfo(const char *ri_body, const signed_descriptor_t *ri, const signed_descriptor_t *ei) { char *out = NULL, *outp; int i; const char *router_sig; const char *ei_body = signed_descriptor_get_body(ei); size_t ri_len = ri->signed_descriptor_len; size_t ei_len = ei->signed_descriptor_len; if (!ei_body) goto bail; outp = out = tor_malloc(ri_len+ei_len+1); if (!(router_sig = tor_memstr(ri_body, ri_len, "\nrouter-signature"))) goto bail; ++router_sig; memcpy(out, ri_body, router_sig-ri_body); outp += router_sig-ri_body; for (i=0; i < 2; ++i) { const char *kwd = i?"\nwrite-history ":"\nread-history "; const char *cp, *eol; if (!(cp = tor_memstr(ei_body, ei_len, kwd))) continue; ++cp; eol = memchr(cp, '\n', ei_len - (cp-ei_body)); memcpy(outp, cp, eol-cp+1); outp += eol-cp+1; } memcpy(outp, router_sig, ri_len - (router_sig-ri_body)); *outp++ = '\0'; tor_assert(outp-out < (int)(ri_len+ei_len+1)); return out; bail: tor_free(out); return tor_strndup(ri_body, ri->signed_descriptor_len); } /** Implementation helper for GETINFO: answers requests for information about * which ports are bound. */ static int getinfo_helper_listeners(control_connection_t *control_conn, const char *question, char **answer, const char **errmsg) { int type; smartlist_t *res; (void)control_conn; (void)errmsg; if (!strcmp(question, "net/listeners/or")) type = CONN_TYPE_OR_LISTENER; else if (!strcmp(question, "net/listeners/dir")) type = CONN_TYPE_DIR_LISTENER; else if (!strcmp(question, "net/listeners/socks")) type = CONN_TYPE_AP_LISTENER; else if (!strcmp(question, "net/listeners/trans")) type = CONN_TYPE_AP_TRANS_LISTENER; else if (!strcmp(question, "net/listeners/natd")) type = CONN_TYPE_AP_NATD_LISTENER; else if (!strcmp(question, "net/listeners/dns")) type = CONN_TYPE_AP_DNS_LISTENER; else if (!strcmp(question, "net/listeners/control")) type = CONN_TYPE_CONTROL_LISTENER; else return 0; /* unknown key */ res = smartlist_create(); SMARTLIST_FOREACH_BEGIN(get_connection_array(), connection_t *, conn) { char *addr; struct sockaddr_storage ss; socklen_t ss_len = sizeof(ss); if (conn->type != type || conn->marked_for_close || !SOCKET_OK(conn->s)) continue; if (getsockname(conn->s, (struct sockaddr *)&ss, &ss_len) < 0) { tor_asprintf(&addr, "%s:%d", conn->address, (int)conn->port); } else { char *tmp = tor_sockaddr_to_str((struct sockaddr *)&ss); addr = esc_for_log(tmp); tor_free(tmp); } if (addr) smartlist_add(res, addr); } SMARTLIST_FOREACH_END(conn); *answer = smartlist_join_strings(res, " ", 0, NULL); SMARTLIST_FOREACH(res, char *, cp, tor_free(cp)); smartlist_free(res); return 0; } /** Implementation helper for GETINFO: knows the answers for questions about * directory information. */ static int getinfo_helper_dir(control_connection_t *control_conn, const char *question, char **answer, const char **errmsg) { const routerinfo_t *ri; (void) control_conn; if (!strcmpstart(question, "desc/id/")) { ri = router_get_by_hexdigest(question+strlen("desc/id/")); if (ri) { const char *body = signed_descriptor_get_body(&ri->cache_info); if (body) *answer = tor_strndup(body, ri->cache_info.signed_descriptor_len); } } else if (!strcmpstart(question, "desc/name/")) { ri = router_get_by_nickname(question+strlen("desc/name/"),1); if (ri) { const char *body = signed_descriptor_get_body(&ri->cache_info); if (body) *answer = tor_strndup(body, ri->cache_info.signed_descriptor_len); } } else if (!strcmp(question, "desc/all-recent")) { routerlist_t *routerlist = router_get_routerlist(); smartlist_t *sl = smartlist_create(); if (routerlist && routerlist->routers) { SMARTLIST_FOREACH(routerlist->routers, const routerinfo_t *, ri, { const char *body = signed_descriptor_get_body(&ri->cache_info); if (body) smartlist_add(sl, tor_strndup(body, ri->cache_info.signed_descriptor_len)); }); } *answer = smartlist_join_strings(sl, "", 0, NULL); SMARTLIST_FOREACH(sl, char *, c, tor_free(c)); smartlist_free(sl); } else if (!strcmp(question, "desc/all-recent-extrainfo-hack")) { /* XXXX Remove this once Torstat asks for extrainfos. */ routerlist_t *routerlist = router_get_routerlist(); smartlist_t *sl = smartlist_create(); if (routerlist && routerlist->routers) { SMARTLIST_FOREACH(routerlist->routers, const routerinfo_t *, ri, { const char *body = signed_descriptor_get_body(&ri->cache_info); signed_descriptor_t *ei = extrainfo_get_by_descriptor_digest( ri->cache_info.extra_info_digest); if (ei && body) { smartlist_add(sl, munge_extrainfo_into_routerinfo(body, &ri->cache_info, ei)); } else if (body) { smartlist_add(sl, tor_strndup(body, ri->cache_info.signed_descriptor_len)); } }); } *answer = smartlist_join_strings(sl, "", 0, NULL); SMARTLIST_FOREACH(sl, char *, c, tor_free(c)); smartlist_free(sl); } else if (!strcmpstart(question, "desc-annotations/id/")) { ri = router_get_by_hexdigest(question+ strlen("desc-annotations/id/")); if (ri) { const char *annotations = signed_descriptor_get_annotations(&ri->cache_info); if (annotations) *answer = tor_strndup(annotations, ri->cache_info.annotations_len); } } else if (!strcmpstart(question, "dir/server/")) { size_t answer_len = 0, url_len = strlen(question)+2; char *url = tor_malloc(url_len); smartlist_t *descs = smartlist_create(); const char *msg; int res; char *cp; tor_snprintf(url, url_len, "/tor/%s", question+4); res = dirserv_get_routerdescs(descs, url, &msg); if (res) { log_warn(LD_CONTROL, "getinfo '%s': %s", question, msg); smartlist_free(descs); tor_free(url); *errmsg = msg; return -1; } SMARTLIST_FOREACH(descs, signed_descriptor_t *, sd, answer_len += sd->signed_descriptor_len); cp = *answer = tor_malloc(answer_len+1); SMARTLIST_FOREACH(descs, signed_descriptor_t *, sd, { memcpy(cp, signed_descriptor_get_body(sd), sd->signed_descriptor_len); cp += sd->signed_descriptor_len; }); *cp = '\0'; tor_free(url); smartlist_free(descs); } else if (!strcmpstart(question, "dir/status/")) { if (directory_permits_controller_requests(get_options())) { size_t len=0; char *cp; smartlist_t *status_list = smartlist_create(); dirserv_get_networkstatus_v2(status_list, question+strlen("dir/status/")); SMARTLIST_FOREACH(status_list, cached_dir_t *, d, len += d->dir_len); cp = *answer = tor_malloc(len+1); SMARTLIST_FOREACH(status_list, cached_dir_t *, d, { memcpy(cp, d->dir, d->dir_len); cp += d->dir_len; }); *cp = '\0'; smartlist_free(status_list); } else { smartlist_t *fp_list = smartlist_create(); smartlist_t *status_list = smartlist_create(); dirserv_get_networkstatus_v2_fingerprints( fp_list, question+strlen("dir/status/")); SMARTLIST_FOREACH(fp_list, const char *, fp, { char *s; char *fname = networkstatus_get_cache_filename(fp); s = read_file_to_str(fname, 0, NULL); if (s) smartlist_add(status_list, s); tor_free(fname); }); SMARTLIST_FOREACH(fp_list, char *, fp, tor_free(fp)); smartlist_free(fp_list); *answer = smartlist_join_strings(status_list, "", 0, NULL); SMARTLIST_FOREACH(status_list, char *, s, tor_free(s)); smartlist_free(status_list); } } else if (!strcmp(question, "dir/status-vote/current/consensus")) { /* v3 */ if (directory_caches_dir_info(get_options())) { const cached_dir_t *consensus = dirserv_get_consensus("ns"); if (consensus) *answer = tor_strdup(consensus->dir); } if (!*answer) { /* try loading it from disk */ char *filename = get_datadir_fname("cached-consensus"); *answer = read_file_to_str(filename, RFTS_IGNORE_MISSING, NULL); tor_free(filename); } } else if (!strcmp(question, "network-status")) { /* v1 */ routerlist_t *routerlist = router_get_routerlist(); if (!routerlist || !routerlist->routers || list_server_status_v1(routerlist->routers, answer, 1) < 0) { return -1; } } else if (!strcmpstart(question, "extra-info/digest/")) { question += strlen("extra-info/digest/"); if (strlen(question) == HEX_DIGEST_LEN) { char d[DIGEST_LEN]; signed_descriptor_t *sd = NULL; if (base16_decode(d, sizeof(d), question, strlen(question))==0) { /* XXXX this test should move into extrainfo_get_by_descriptor_digest, * but I don't want to risk affecting other parts of the code, * especially since the rules for using our own extrainfo (including * when it might be freed) are different from those for using one * we have downloaded. */ if (router_extrainfo_digest_is_me(d)) sd = &(router_get_my_extrainfo()->cache_info); else sd = extrainfo_get_by_descriptor_digest(d); } if (sd) { const char *body = signed_descriptor_get_body(sd); if (body) *answer = tor_strndup(body, sd->signed_descriptor_len); } } } return 0; } /** Implementation helper for GETINFO: knows how to generate summaries of the * current states of things we send events about. */ static int getinfo_helper_events(control_connection_t *control_conn, const char *question, char **answer, const char **errmsg) { (void) control_conn; if (!strcmp(question, "circuit-status")) { circuit_t *circ; smartlist_t *status = smartlist_create(); for (circ = _circuit_get_global_list(); circ; circ = circ->next) { char *s, *path; size_t slen; const char *state; const char *purpose; if (! CIRCUIT_IS_ORIGIN(circ) || circ->marked_for_close) continue; path = circuit_list_path_for_controller(TO_ORIGIN_CIRCUIT(circ)); if (circ->state == CIRCUIT_STATE_OPEN) state = "BUILT"; else if (strlen(path)) state = "EXTENDED"; else state = "LAUNCHED"; purpose = circuit_purpose_to_controller_string(circ->purpose); slen = strlen(path)+strlen(state)+strlen(purpose)+30; s = tor_malloc(slen+1); tor_snprintf(s, slen, "%lu %s%s%s PURPOSE=%s", (unsigned long)TO_ORIGIN_CIRCUIT(circ)->global_identifier, state, *path ? " " : "", path, purpose); smartlist_add(status, s); tor_free(path); } *answer = smartlist_join_strings(status, "\r\n", 0, NULL); SMARTLIST_FOREACH(status, char *, cp, tor_free(cp)); smartlist_free(status); } else if (!strcmp(question, "stream-status")) { smartlist_t *conns = get_connection_array(); smartlist_t *status = smartlist_create(); char buf[256]; SMARTLIST_FOREACH_BEGIN(conns, connection_t *, base_conn) { const char *state; entry_connection_t *conn; char *s; size_t slen; circuit_t *circ; origin_circuit_t *origin_circ = NULL; if (base_conn->type != CONN_TYPE_AP || base_conn->marked_for_close || base_conn->state == AP_CONN_STATE_SOCKS_WAIT || base_conn->state == AP_CONN_STATE_NATD_WAIT) continue; conn = TO_ENTRY_CONN(base_conn); switch (base_conn->state) { case AP_CONN_STATE_CONTROLLER_WAIT: case AP_CONN_STATE_CIRCUIT_WAIT: if (conn->socks_request && SOCKS_COMMAND_IS_RESOLVE(conn->socks_request->command)) state = "NEWRESOLVE"; else state = "NEW"; break; case AP_CONN_STATE_RENDDESC_WAIT: case AP_CONN_STATE_CONNECT_WAIT: state = "SENTCONNECT"; break; case AP_CONN_STATE_RESOLVE_WAIT: state = "SENTRESOLVE"; break; case AP_CONN_STATE_OPEN: state = "SUCCEEDED"; break; default: log_warn(LD_BUG, "Asked for stream in unknown state %d", base_conn->state); continue; } circ = circuit_get_by_edge_conn(ENTRY_TO_EDGE_CONN(conn)); if (circ && CIRCUIT_IS_ORIGIN(circ)) origin_circ = TO_ORIGIN_CIRCUIT(circ); write_stream_target_to_buf(conn, buf, sizeof(buf)); slen = strlen(buf)+strlen(state)+32; s = tor_malloc(slen+1); tor_snprintf(s, slen, "%lu %s %lu %s", (unsigned long) base_conn->global_identifier,state, origin_circ? (unsigned long)origin_circ->global_identifier : 0ul, buf); smartlist_add(status, s); } SMARTLIST_FOREACH_END(base_conn); *answer = smartlist_join_strings(status, "\r\n", 0, NULL); SMARTLIST_FOREACH(status, char *, cp, tor_free(cp)); smartlist_free(status); } else if (!strcmp(question, "orconn-status")) { smartlist_t *conns = get_connection_array(); smartlist_t *status = smartlist_create(); SMARTLIST_FOREACH_BEGIN(conns, connection_t *, base_conn) { const char *state; char *s; char name[128]; size_t slen; or_connection_t *conn; if (base_conn->type != CONN_TYPE_OR || base_conn->marked_for_close) continue; conn = TO_OR_CONN(base_conn); if (conn->_base.state == OR_CONN_STATE_OPEN) state = "CONNECTED"; else if (conn->nickname) state = "LAUNCHED"; else state = "NEW"; orconn_target_get_name(name, sizeof(name), conn); slen = strlen(name)+strlen(state)+2; s = tor_malloc(slen+1); tor_snprintf(s, slen, "%s %s", name, state); smartlist_add(status, s); } SMARTLIST_FOREACH_END(base_conn); *answer = smartlist_join_strings(status, "\r\n", 0, NULL); SMARTLIST_FOREACH(status, char *, cp, tor_free(cp)); smartlist_free(status); } else if (!strcmpstart(question, "address-mappings/")) { time_t min_e, max_e; smartlist_t *mappings; question += strlen("address-mappings/"); if (!strcmp(question, "all")) { min_e = 0; max_e = TIME_MAX; } else if (!strcmp(question, "cache")) { min_e = 2; max_e = TIME_MAX; } else if (!strcmp(question, "config")) { min_e = 0; max_e = 0; } else if (!strcmp(question, "control")) { min_e = 1; max_e = 1; } else { return 0; } mappings = smartlist_create(); addressmap_get_mappings(mappings, min_e, max_e, 1); *answer = smartlist_join_strings(mappings, "\r\n", 0, NULL); SMARTLIST_FOREACH(mappings, char *, cp, tor_free(cp)); smartlist_free(mappings); } else if (!strcmpstart(question, "status/")) { /* Note that status/ is not a catch-all for events; there's only supposed * to be a status GETINFO if there's a corresponding STATUS event. */ if (!strcmp(question, "status/circuit-established")) { *answer = tor_strdup(can_complete_circuit ? "1" : "0"); } else if (!strcmp(question, "status/enough-dir-info")) { *answer = tor_strdup(router_have_minimum_dir_info() ? "1" : "0"); } else if (!strcmp(question, "status/good-server-descriptor") || !strcmp(question, "status/accepted-server-descriptor")) { /* They're equivalent for now, until we can figure out how to make * good-server-descriptor be what we want. See comment in * control-spec.txt. */ *answer = tor_strdup(directories_have_accepted_server_descriptor() ? "1" : "0"); } else if (!strcmp(question, "status/reachability-succeeded/or")) { *answer = tor_strdup(check_whether_orport_reachable() ? "1" : "0"); } else if (!strcmp(question, "status/reachability-succeeded/dir")) { *answer = tor_strdup(check_whether_dirport_reachable() ? "1" : "0"); } else if (!strcmp(question, "status/reachability-succeeded")) { *answer = tor_malloc(16); tor_snprintf(*answer, 16, "OR=%d DIR=%d", check_whether_orport_reachable() ? 1 : 0, check_whether_dirport_reachable() ? 1 : 0); } else if (!strcmp(question, "status/bootstrap-phase")) { *answer = tor_strdup(last_sent_bootstrap_message); } else if (!strcmpstart(question, "status/version/")) { int is_server = server_mode(get_options()); networkstatus_t *c = networkstatus_get_latest_consensus(); version_status_t status; const char *recommended; if (c) { recommended = is_server ? c->server_versions : c->client_versions; status = tor_version_is_obsolete(VERSION, recommended); } else { recommended = "?"; status = VS_UNKNOWN; } if (!strcmp(question, "status/version/recommended")) { *answer = tor_strdup(recommended); return 0; } if (!strcmp(question, "status/version/current")) { switch (status) { case VS_RECOMMENDED: *answer = tor_strdup("recommended"); break; case VS_OLD: *answer = tor_strdup("obsolete"); break; case VS_NEW: *answer = tor_strdup("new"); break; case VS_NEW_IN_SERIES: *answer = tor_strdup("new in series"); break; case VS_UNRECOMMENDED: *answer = tor_strdup("unrecommended"); break; case VS_EMPTY: *answer = tor_strdup("none recommended"); break; case VS_UNKNOWN: *answer = tor_strdup("unknown"); break; default: tor_fragile_assert(); } } else if (!strcmp(question, "status/version/num-versioning") || !strcmp(question, "status/version/num-concurring")) { char s[33]; tor_snprintf(s, sizeof(s), "%d", get_n_authorities(V3_DIRINFO)); *answer = tor_strdup(s); log_warn(LD_GENERAL, "%s is deprecated; it no longer gives useful " "information", question); } } else if (!strcmp(question, "status/clients-seen")) { char *bridge_stats = geoip_get_bridge_stats_controller(time(NULL)); if (!bridge_stats) { *errmsg = "No bridge-client stats available"; return -1; } *answer = bridge_stats; } else { return 0; } } return 0; } /** Callback function for GETINFO: on a given control connection, try to * answer the question q and store the newly-allocated answer in * *a. If an internal error occurs, return -1 and optionally set * *error_out to point to an error message to be delivered to the * controller. On success, _or if the key is not recognized_, return 0. Do not * set a if the key is not recognized. */ typedef int (*getinfo_helper_t)(control_connection_t *, const char *q, char **a, const char **error_out); /** A single item for the GETINFO question-to-answer-function table. */ typedef struct getinfo_item_t { const char *varname; /**< The value (or prefix) of the question. */ getinfo_helper_t fn; /**< The function that knows the answer: NULL if * this entry is documentation-only. */ const char *desc; /**< Description of the variable. */ int is_prefix; /** Must varname match exactly, or must it be a prefix? */ } getinfo_item_t; #define ITEM(name, fn, desc) { name, getinfo_helper_##fn, desc, 0 } #define PREFIX(name, fn, desc) { name, getinfo_helper_##fn, desc, 1 } #define DOC(name, desc) { name, NULL, desc, 0 } /** Table mapping questions accepted by GETINFO to the functions that know how * to answer them. */ static const getinfo_item_t getinfo_items[] = { ITEM("version", misc, "The current version of Tor."), ITEM("config-file", misc, "Current location of the \"torrc\" file."), ITEM("config-text", misc, "Return the string that would be written by a saveconf command."), ITEM("accounting/bytes", accounting, "Number of bytes read/written so far in the accounting interval."), ITEM("accounting/bytes-left", accounting, "Number of bytes left to write/read so far in the accounting interval."), ITEM("accounting/enabled", accounting, "Is accounting currently enabled?"), ITEM("accounting/hibernating", accounting, "Are we hibernating or awake?"), ITEM("accounting/interval-start", accounting, "Time when the accounting period starts."), ITEM("accounting/interval-end", accounting, "Time when the accounting period ends."), ITEM("accounting/interval-wake", accounting, "Time to wake up in this accounting period."), ITEM("helper-nodes", entry_guards, NULL), /* deprecated */ ITEM("entry-guards", entry_guards, "Which nodes are we using as entry guards?"), ITEM("fingerprint", misc, NULL), PREFIX("config/", config, "Current configuration values."), DOC("config/names", "List of configuration options, types, and documentation."), ITEM("info/names", misc, "List of GETINFO options, types, and documentation."), ITEM("events/names", misc, "Events that the controller can ask for with SETEVENTS."), ITEM("features/names", misc, "What arguments can USEFEATURE take?"), PREFIX("desc/id/", dir, "Router descriptors by ID."), PREFIX("desc/name/", dir, "Router descriptors by nickname."), ITEM("desc/all-recent", dir, "All non-expired, non-superseded router descriptors."), ITEM("desc/all-recent-extrainfo-hack", dir, NULL), /* Hack. */ PREFIX("extra-info/digest/", dir, "Extra-info documents by digest."), PREFIX("net/listeners/", listeners, "Bound addresses by type"), ITEM("ns/all", networkstatus, "Brief summary of router status (v2 directory format)"), PREFIX("ns/id/", networkstatus, "Brief summary of router status by ID (v2 directory format)."), PREFIX("ns/name/", networkstatus, "Brief summary of router status by nickname (v2 directory format)."), PREFIX("ns/purpose/", networkstatus, "Brief summary of router status by purpose (v2 directory format)."), ITEM("network-status", dir, "Brief summary of router status (v1 directory format)"), ITEM("circuit-status", events, "List of current circuits originating here."), ITEM("stream-status", events,"List of current streams."), ITEM("orconn-status", events, "A list of current OR connections."), PREFIX("address-mappings/", events, NULL), DOC("address-mappings/all", "Current address mappings."), DOC("address-mappings/cache", "Current cached DNS replies."), DOC("address-mappings/config", "Current address mappings from configuration."), DOC("address-mappings/control", "Current address mappings from controller."), PREFIX("status/", events, NULL), DOC("status/circuit-established", "Whether we think client functionality is working."), DOC("status/enough-dir-info", "Whether we have enough up-to-date directory information to build " "circuits."), DOC("status/bootstrap-phase", "The last bootstrap phase status event that Tor sent."), DOC("status/clients-seen", "Breakdown of client countries seen by a bridge."), DOC("status/version/recommended", "List of currently recommended versions."), DOC("status/version/current", "Status of the current version."), DOC("status/version/num-versioning", "Number of versioning authorities."), DOC("status/version/num-concurring", "Number of versioning authorities agreeing on the status of the " "current version"), ITEM("address", misc, "IP address of this Tor host, if we can guess it."), ITEM("traffic/read", misc,"Bytes read since the process was started."), ITEM("traffic/written", misc, "Bytes written since the process was started."), ITEM("process/pid", misc, "Process id belonging to the main tor process."), ITEM("process/uid", misc, "User id running the tor process."), ITEM("process/user", misc, "Username under which the tor process is running."), ITEM("process/descriptor-limit", misc, "File descriptor limit."), ITEM("dir-usage", misc, "Breakdown of bytes transferred over DirPort."), PREFIX("desc-annotations/id/", dir, "Router annotations by hexdigest."), PREFIX("dir/server/", dir,"Router descriptors as retrieved from a DirPort."), PREFIX("dir/status/", dir, "v2 networkstatus docs as retrieved from a DirPort."), ITEM("dir/status-vote/current/consensus", dir, "v3 Networkstatus consensus as retrieved from a DirPort."), ITEM("exit-policy/default", policies, "The default value appended to the configured exit policy."), PREFIX("ip-to-country/", geoip, "Perform a GEOIP lookup"), { NULL, NULL, NULL, 0 } }; /** Allocate and return a list of recognized GETINFO options. */ static char * list_getinfo_options(void) { int i; char *buf=NULL; smartlist_t *lines = smartlist_create(); char *ans; for (i = 0; getinfo_items[i].varname; ++i) { if (!getinfo_items[i].desc) continue; tor_asprintf(&buf, "%s%s -- %s\n", getinfo_items[i].varname, getinfo_items[i].is_prefix ? "*" : "", getinfo_items[i].desc); smartlist_add(lines, buf); } smartlist_sort_strings(lines); ans = smartlist_join_strings(lines, "", 0, NULL); SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp)); smartlist_free(lines); return ans; } /** Lookup the 'getinfo' entry question, and return * the answer in *answer (or NULL if key not recognized). * Return 0 if success or unrecognized, or -1 if recognized but * internal error. */ static int handle_getinfo_helper(control_connection_t *control_conn, const char *question, char **answer, const char **err_out) { int i; *answer = NULL; /* unrecognized key by default */ for (i = 0; getinfo_items[i].varname; ++i) { int match; if (getinfo_items[i].is_prefix) match = !strcmpstart(question, getinfo_items[i].varname); else match = !strcmp(question, getinfo_items[i].varname); if (match) { tor_assert(getinfo_items[i].fn); return getinfo_items[i].fn(control_conn, question, answer, err_out); } } return 0; /* unrecognized */ } /** Called when we receive a GETINFO command. Try to fetch all requested * information, and reply with information or error message. */ static int handle_control_getinfo(control_connection_t *conn, uint32_t len, const char *body) { smartlist_t *questions = smartlist_create(); smartlist_t *answers = smartlist_create(); smartlist_t *unrecognized = smartlist_create(); char *msg = NULL, *ans = NULL; int i; (void) len; /* body is NUL-terminated, so it's safe to ignore the length. */ smartlist_split_string(questions, body, " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); SMARTLIST_FOREACH_BEGIN(questions, const char *, q) { const char *errmsg = NULL; if (handle_getinfo_helper(conn, q, &ans, &errmsg) < 0) { if (!errmsg) errmsg = "Internal error"; connection_printf_to_buf(conn, "551 %s\r\n", errmsg); goto done; } if (!ans) { smartlist_add(unrecognized, (char*)q); } else { smartlist_add(answers, tor_strdup(q)); smartlist_add(answers, ans); } } SMARTLIST_FOREACH_END(q); if (smartlist_len(unrecognized)) { for (i=0; i < smartlist_len(unrecognized)-1; ++i) connection_printf_to_buf(conn, "552-Unrecognized key \"%s\"\r\n", (char*)smartlist_get(unrecognized, i)); connection_printf_to_buf(conn, "552 Unrecognized key \"%s\"\r\n", (char*)smartlist_get(unrecognized, i)); goto done; } for (i = 0; i < smartlist_len(answers); i += 2) { char *k = smartlist_get(answers, i); char *v = smartlist_get(answers, i+1); if (!strchr(v, '\n') && !strchr(v, '\r')) { connection_printf_to_buf(conn, "250-%s=", k); connection_write_str_to_buf(v, conn); connection_write_str_to_buf("\r\n", conn); } else { char *esc = NULL; size_t esc_len; esc_len = write_escaped_data(v, strlen(v), &esc); connection_printf_to_buf(conn, "250+%s=\r\n", k); connection_write_to_buf(esc, esc_len, TO_CONN(conn)); tor_free(esc); } } connection_write_str_to_buf("250 OK\r\n", conn); done: SMARTLIST_FOREACH(answers, char *, cp, tor_free(cp)); smartlist_free(answers); SMARTLIST_FOREACH(questions, char *, cp, tor_free(cp)); smartlist_free(questions); smartlist_free(unrecognized); tor_free(msg); return 0; } /** Given a string, convert it to a circuit purpose. */ static uint8_t circuit_purpose_from_string(const char *string) { if (!strcasecmpstart(string, "purpose=")) string += strlen("purpose="); if (!strcasecmp(string, "general")) return CIRCUIT_PURPOSE_C_GENERAL; else if (!strcasecmp(string, "controller")) return CIRCUIT_PURPOSE_CONTROLLER; else return CIRCUIT_PURPOSE_UNKNOWN; } /** Return a newly allocated smartlist containing the arguments to the command * waiting in body. If there are fewer than min_args arguments, * or if max_args is nonnegative and there are more than * max_args arguments, send a 512 error to the controller, using * command as the command name in the error message. */ static smartlist_t * getargs_helper(const char *command, control_connection_t *conn, const char *body, int min_args, int max_args) { smartlist_t *args = smartlist_create(); smartlist_split_string(args, body, " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); if (smartlist_len(args) < min_args) { connection_printf_to_buf(conn, "512 Missing argument to %s\r\n",command); goto err; } else if (max_args >= 0 && smartlist_len(args) > max_args) { connection_printf_to_buf(conn, "512 Too many arguments to %s\r\n",command); goto err; } return args; err: SMARTLIST_FOREACH(args, char *, s, tor_free(s)); smartlist_free(args); return NULL; } /** Helper. Return the first element of sl at index start_at or * higher that starts with prefix, case-insensitive. Return NULL if no * such element exists. */ static const char * find_element_starting_with(smartlist_t *sl, int start_at, const char *prefix) { int i; for (i = start_at; i < smartlist_len(sl); ++i) { const char *elt = smartlist_get(sl, i); if (!strcasecmpstart(elt, prefix)) return elt; } return NULL; } /** Helper. Return true iff s is an argument that we should treat as a * key-value pair. */ static int is_keyval_pair(const char *s) { /* An argument is a key-value pair if it has an =, and it isn't of the form * $fingeprint=name */ return strchr(s, '=') && s[0] != '$'; } /** Called when we get an EXTENDCIRCUIT message. Try to extend the listed * circuit, and report success or failure. */ static int handle_control_extendcircuit(control_connection_t *conn, uint32_t len, const char *body) { smartlist_t *router_nicknames=NULL, *nodes=NULL; origin_circuit_t *circ = NULL; int zero_circ; uint8_t intended_purpose = CIRCUIT_PURPOSE_C_GENERAL; smartlist_t *args; (void) len; router_nicknames = smartlist_create(); args = getargs_helper("EXTENDCIRCUIT", conn, body, 1, -1); if (!args) goto done; zero_circ = !strcmp("0", (char*)smartlist_get(args,0)); if (zero_circ) { const char *purp = find_element_starting_with(args, 1, "PURPOSE="); if (purp) { intended_purpose = circuit_purpose_from_string(purp); if (intended_purpose == CIRCUIT_PURPOSE_UNKNOWN) { connection_printf_to_buf(conn, "552 Unknown purpose \"%s\"\r\n", purp); SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); goto done; } } if ((smartlist_len(args) == 1) || (smartlist_len(args) >= 2 && is_keyval_pair(smartlist_get(args, 1)))) { // "EXTENDCIRCUIT 0" || EXTENDCIRCUIT 0 foo=bar" circ = circuit_launch(intended_purpose, CIRCLAUNCH_NEED_CAPACITY); if (!circ) { connection_write_str_to_buf("551 Couldn't start circuit\r\n", conn); } else { connection_printf_to_buf(conn, "250 EXTENDED %lu\r\n", (unsigned long)circ->global_identifier); } SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); goto done; } // "EXTENDCIRCUIT 0 router1,router2" || // "EXTENDCIRCUIT 0 router1,router2 PURPOSE=foo" } if (!zero_circ && !(circ = get_circ(smartlist_get(args,0)))) { connection_printf_to_buf(conn, "552 Unknown circuit \"%s\"\r\n", (char*)smartlist_get(args, 0)); SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); goto done; } smartlist_split_string(router_nicknames, smartlist_get(args,1), ",", 0, 0); SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); nodes = smartlist_create(); SMARTLIST_FOREACH(router_nicknames, const char *, n, { const node_t *node = node_get_by_nickname(n, 1); if (!node) { connection_printf_to_buf(conn, "552 No such router \"%s\"\r\n", n); goto done; } if (!node_has_descriptor(node)) { connection_printf_to_buf(conn, "552 descriptor for \"%s\"\r\n", n); goto done; } smartlist_add(nodes, (void*)node); }); if (!smartlist_len(nodes)) { connection_write_str_to_buf("512 No router names provided\r\n", conn); goto done; } if (zero_circ) { /* start a new circuit */ circ = origin_circuit_init(intended_purpose, 0); } /* now circ refers to something that is ready to be extended */ SMARTLIST_FOREACH(nodes, const node_t *, node, { extend_info_t *info = extend_info_from_node(node); tor_assert(info); /* True, since node_has_descriptor(node) == true */ circuit_append_new_exit(circ, info); extend_info_free(info); }); /* now that we've populated the cpath, start extending */ if (zero_circ) { int err_reason = 0; if ((err_reason = circuit_handle_first_hop(circ)) < 0) { circuit_mark_for_close(TO_CIRCUIT(circ), -err_reason); connection_write_str_to_buf("551 Couldn't start circuit\r\n", conn); goto done; } } else { if (circ->_base.state == CIRCUIT_STATE_OPEN) { int err_reason = 0; circuit_set_state(TO_CIRCUIT(circ), CIRCUIT_STATE_BUILDING); if ((err_reason = circuit_send_next_onion_skin(circ)) < 0) { log_info(LD_CONTROL, "send_next_onion_skin failed; circuit marked for closing."); circuit_mark_for_close(TO_CIRCUIT(circ), -err_reason); connection_write_str_to_buf("551 Couldn't send onion skin\r\n", conn); goto done; } } } connection_printf_to_buf(conn, "250 EXTENDED %lu\r\n", (unsigned long)circ->global_identifier); if (zero_circ) /* send a 'launched' event, for completeness */ control_event_circuit_status(circ, CIRC_EVENT_LAUNCHED, 0); done: SMARTLIST_FOREACH(router_nicknames, char *, n, tor_free(n)); smartlist_free(router_nicknames); smartlist_free(nodes); return 0; } /** Called when we get a SETCIRCUITPURPOSE message. If we can find the * circuit and it's a valid purpose, change it. */ static int handle_control_setcircuitpurpose(control_connection_t *conn, uint32_t len, const char *body) { origin_circuit_t *circ = NULL; uint8_t new_purpose; smartlist_t *args; (void) len; /* body is NUL-terminated, so it's safe to ignore the length. */ args = getargs_helper("SETCIRCUITPURPOSE", conn, body, 2, -1); if (!args) goto done; if (!(circ = get_circ(smartlist_get(args,0)))) { connection_printf_to_buf(conn, "552 Unknown circuit \"%s\"\r\n", (char*)smartlist_get(args, 0)); goto done; } { const char *purp = find_element_starting_with(args,1,"PURPOSE="); new_purpose = circuit_purpose_from_string(purp); if (new_purpose == CIRCUIT_PURPOSE_UNKNOWN) { connection_printf_to_buf(conn, "552 Unknown purpose \"%s\"\r\n", purp); goto done; } } circ->_base.purpose = new_purpose; connection_write_str_to_buf("250 OK\r\n", conn); done: if (args) { SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); } return 0; } /** Called when we get an ATTACHSTREAM message. Try to attach the requested * stream, and report success or failure. */ static int handle_control_attachstream(control_connection_t *conn, uint32_t len, const char *body) { entry_connection_t *ap_conn = NULL; origin_circuit_t *circ = NULL; int zero_circ; smartlist_t *args; crypt_path_t *cpath=NULL; int hop=0, hop_line_ok=1; (void) len; args = getargs_helper("ATTACHSTREAM", conn, body, 2, -1); if (!args) return 0; zero_circ = !strcmp("0", (char*)smartlist_get(args,1)); if (!(ap_conn = get_stream(smartlist_get(args, 0)))) { connection_printf_to_buf(conn, "552 Unknown stream \"%s\"\r\n", (char*)smartlist_get(args, 0)); } else if (!zero_circ && !(circ = get_circ(smartlist_get(args, 1)))) { connection_printf_to_buf(conn, "552 Unknown circuit \"%s\"\r\n", (char*)smartlist_get(args, 1)); } else if (circ) { const char *hopstring = find_element_starting_with(args,2,"HOP="); if (hopstring) { hopstring += strlen("HOP="); hop = (int) tor_parse_ulong(hopstring, 10, 0, INT_MAX, &hop_line_ok, NULL); if (!hop_line_ok) { /* broken hop line */ connection_printf_to_buf(conn, "552 Bad value hop=%s\r\n", hopstring); } } } SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); if (!ap_conn || (!zero_circ && !circ) || !hop_line_ok) return 0; if (ENTRY_TO_CONN(ap_conn)->state != AP_CONN_STATE_CONTROLLER_WAIT && ENTRY_TO_CONN(ap_conn)->state != AP_CONN_STATE_CONNECT_WAIT && ENTRY_TO_CONN(ap_conn)->state != AP_CONN_STATE_RESOLVE_WAIT) { connection_write_str_to_buf( "555 Connection is not managed by controller.\r\n", conn); return 0; } /* Do we need to detach it first? */ if (ENTRY_TO_CONN(ap_conn)->state != AP_CONN_STATE_CONTROLLER_WAIT) { edge_connection_t *edge_conn = ENTRY_TO_EDGE_CONN(ap_conn); circuit_t *tmpcirc = circuit_get_by_edge_conn(edge_conn); connection_edge_end(edge_conn, END_STREAM_REASON_TIMEOUT); /* Un-mark it as ending, since we're going to reuse it. */ edge_conn->edge_has_sent_end = 0; edge_conn->end_reason = 0; if (tmpcirc) circuit_detach_stream(tmpcirc, edge_conn); TO_CONN(edge_conn)->state = AP_CONN_STATE_CONTROLLER_WAIT; } if (circ && (circ->_base.state != CIRCUIT_STATE_OPEN)) { connection_write_str_to_buf( "551 Can't attach stream to non-open origin circuit\r\n", conn); return 0; } /* Is this a single hop circuit? */ if (circ && (circuit_get_cpath_len(circ)<2 || hop==1)) { const node_t *node = NULL; char *exit_digest; if (circ->build_state && circ->build_state->chosen_exit && !tor_digest_is_zero(circ->build_state->chosen_exit->identity_digest)) { exit_digest = circ->build_state->chosen_exit->identity_digest; node = node_get_by_id(exit_digest); } /* Do both the client and relay allow one-hop exit circuits? */ if (!node || !node_allows_single_hop_exits(node) || !get_options()->AllowSingleHopCircuits) { connection_write_str_to_buf( "551 Can't attach stream to this one-hop circuit.\r\n", conn); return 0; } ap_conn->chosen_exit_name = tor_strdup(hex_str(exit_digest, DIGEST_LEN)); } if (circ && hop>0) { /* find this hop in the circuit, and set cpath */ cpath = circuit_get_cpath_hop(circ, hop); if (!cpath) { connection_printf_to_buf(conn, "551 Circuit doesn't have %d hops.\r\n", hop); return 0; } } if (connection_ap_handshake_rewrite_and_attach(ap_conn, circ, cpath) < 0) { connection_write_str_to_buf("551 Unable to attach stream\r\n", conn); return 0; } send_control_done(conn); return 0; } /** Called when we get a POSTDESCRIPTOR message. Try to learn the provided * descriptor, and report success or failure. */ static int handle_control_postdescriptor(control_connection_t *conn, uint32_t len, const char *body) { char *desc; const char *msg=NULL; uint8_t purpose = ROUTER_PURPOSE_GENERAL; int cache = 0; /* eventually, we may switch this to 1 */ char *cp = memchr(body, '\n', len); smartlist_t *args = smartlist_create(); tor_assert(cp); *cp++ = '\0'; smartlist_split_string(args, body, " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); SMARTLIST_FOREACH(args, char *, option, { if (!strcasecmpstart(option, "purpose=")) { option += strlen("purpose="); purpose = router_purpose_from_string(option); if (purpose == ROUTER_PURPOSE_UNKNOWN) { connection_printf_to_buf(conn, "552 Unknown purpose \"%s\"\r\n", option); goto done; } } else if (!strcasecmpstart(option, "cache=")) { option += strlen("cache="); if (!strcasecmp(option, "no")) cache = 0; else if (!strcasecmp(option, "yes")) cache = 1; else { connection_printf_to_buf(conn, "552 Unknown cache request \"%s\"\r\n", option); goto done; } } else { /* unrecognized argument? */ connection_printf_to_buf(conn, "512 Unexpected argument \"%s\" to postdescriptor\r\n", option); goto done; } }); read_escaped_data(cp, len-(cp-body), &desc); switch (router_load_single_router(desc, purpose, cache, &msg)) { case -1: if (!msg) msg = "Could not parse descriptor"; connection_printf_to_buf(conn, "554 %s\r\n", msg); break; case 0: if (!msg) msg = "Descriptor not added"; connection_printf_to_buf(conn, "251 %s\r\n",msg); break; case 1: send_control_done(conn); break; } tor_free(desc); done: SMARTLIST_FOREACH(args, char *, arg, tor_free(arg)); smartlist_free(args); return 0; } /** Called when we receive a REDIRECTSTERAM command. Try to change the target * address of the named AP stream, and report success or failure. */ static int handle_control_redirectstream(control_connection_t *conn, uint32_t len, const char *body) { entry_connection_t *ap_conn = NULL; char *new_addr = NULL; uint16_t new_port = 0; smartlist_t *args; (void) len; args = getargs_helper("REDIRECTSTREAM", conn, body, 2, -1); if (!args) return 0; if (!(ap_conn = get_stream(smartlist_get(args, 0))) || !ap_conn->socks_request) { connection_printf_to_buf(conn, "552 Unknown stream \"%s\"\r\n", (char*)smartlist_get(args, 0)); } else { int ok = 1; if (smartlist_len(args) > 2) { /* they included a port too */ new_port = (uint16_t) tor_parse_ulong(smartlist_get(args, 2), 10, 1, 65535, &ok, NULL); } if (!ok) { connection_printf_to_buf(conn, "512 Cannot parse port \"%s\"\r\n", (char*)smartlist_get(args, 2)); } else { new_addr = tor_strdup(smartlist_get(args, 1)); } } SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); if (!new_addr) return 0; strlcpy(ap_conn->socks_request->address, new_addr, sizeof(ap_conn->socks_request->address)); if (new_port) ap_conn->socks_request->port = new_port; tor_free(new_addr); send_control_done(conn); return 0; } /** Called when we get a CLOSESTREAM command; try to close the named stream * and report success or failure. */ static int handle_control_closestream(control_connection_t *conn, uint32_t len, const char *body) { entry_connection_t *ap_conn=NULL; uint8_t reason=0; smartlist_t *args; int ok; (void) len; args = getargs_helper("CLOSESTREAM", conn, body, 2, -1); if (!args) return 0; else if (!(ap_conn = get_stream(smartlist_get(args, 0)))) connection_printf_to_buf(conn, "552 Unknown stream \"%s\"\r\n", (char*)smartlist_get(args, 0)); else { reason = (uint8_t) tor_parse_ulong(smartlist_get(args,1), 10, 0, 255, &ok, NULL); if (!ok) { connection_printf_to_buf(conn, "552 Unrecognized reason \"%s\"\r\n", (char*)smartlist_get(args, 1)); ap_conn = NULL; } } SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); if (!ap_conn) return 0; connection_mark_unattached_ap(ap_conn, reason); send_control_done(conn); return 0; } /** Called when we get a CLOSECIRCUIT command; try to close the named circuit * and report success or failure. */ static int handle_control_closecircuit(control_connection_t *conn, uint32_t len, const char *body) { origin_circuit_t *circ = NULL; int safe = 0; smartlist_t *args; (void) len; args = getargs_helper("CLOSECIRCUIT", conn, body, 1, -1); if (!args) return 0; if (!(circ=get_circ(smartlist_get(args, 0)))) connection_printf_to_buf(conn, "552 Unknown circuit \"%s\"\r\n", (char*)smartlist_get(args, 0)); else { int i; for (i=1; i < smartlist_len(args); ++i) { if (!strcasecmp(smartlist_get(args, i), "IfUnused")) safe = 1; else log_info(LD_CONTROL, "Skipping unknown option %s", (char*)smartlist_get(args,i)); } } SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); if (!circ) return 0; if (!safe || !circ->p_streams) { circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_REQUESTED); } send_control_done(conn); return 0; } /** Called when we get a RESOLVE command: start trying to resolve * the listed addresses. */ static int handle_control_resolve(control_connection_t *conn, uint32_t len, const char *body) { smartlist_t *args, *failed; int is_reverse = 0; (void) len; /* body is nul-terminated; it's safe to ignore the length */ if (!(conn->event_mask & ((uint32_t)1L<have_sent_protocolinfo = 1; args = smartlist_create(); smartlist_split_string(args, body, " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); SMARTLIST_FOREACH(args, const char *, arg, { int ok; tor_parse_long(arg, 10, 0, LONG_MAX, &ok, NULL); if (!ok) { bad_arg = arg; break; } }); if (bad_arg) { connection_printf_to_buf(conn, "513 No such version %s\r\n", escaped(bad_arg)); /* Don't tolerate bad arguments when not authenticated. */ if (!STATE_IS_OPEN(TO_CONN(conn)->state)) connection_mark_for_close(TO_CONN(conn)); goto done; } else { const or_options_t *options = get_options(); int cookies = options->CookieAuthentication; char *cfile = get_cookie_file(); char *esc_cfile = esc_for_log(cfile); char *methods; { int passwd = (options->HashedControlPassword != NULL || options->HashedControlSessionPassword != NULL); smartlist_t *mlist = smartlist_create(); if (cookies) smartlist_add(mlist, (char*)"COOKIE"); if (passwd) smartlist_add(mlist, (char*)"HASHEDPASSWORD"); if (!cookies && !passwd) smartlist_add(mlist, (char*)"NULL"); methods = smartlist_join_strings(mlist, ",", 0, NULL); smartlist_free(mlist); } connection_printf_to_buf(conn, "250-PROTOCOLINFO 1\r\n" "250-AUTH METHODS=%s%s%s\r\n" "250-VERSION Tor=%s\r\n" "250 OK\r\n", methods, cookies?" COOKIEFILE=":"", cookies?esc_cfile:"", escaped(VERSION)); tor_free(methods); tor_free(cfile); tor_free(esc_cfile); } done: SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); return 0; } /** Called when we get a USEFEATURE command: parse the feature list, and * set up the control_connection's options properly. */ static int handle_control_usefeature(control_connection_t *conn, uint32_t len, const char *body) { smartlist_t *args; int bad = 0; (void) len; /* body is nul-terminated; it's safe to ignore the length */ args = smartlist_create(); smartlist_split_string(args, body, " ", SPLIT_SKIP_SPACE|SPLIT_IGNORE_BLANK, 0); SMARTLIST_FOREACH(args, const char *, arg, { if (!strcasecmp(arg, "VERBOSE_NAMES")) ; else if (!strcasecmp(arg, "EXTENDED_EVENTS")) ; else { connection_printf_to_buf(conn, "552 Unrecognized feature \"%s\"\r\n", arg); bad = 1; break; } }); if (!bad) { send_control_done(conn); } SMARTLIST_FOREACH(args, char *, cp, tor_free(cp)); smartlist_free(args); return 0; } /** Called when conn has no more bytes left on its outbuf. */ int connection_control_finished_flushing(control_connection_t *conn) { tor_assert(conn); return 0; } /** Called when conn has gotten its socket closed. */ int connection_control_reached_eof(control_connection_t *conn) { tor_assert(conn); log_info(LD_CONTROL,"Control connection reached EOF. Closing."); connection_mark_for_close(TO_CONN(conn)); return 0; } /** Shut down this Tor instance in the same way that SIGINT would, but * with a log message appropriate for the loss of an owning controller. */ static void lost_owning_controller(const char *owner_type, const char *loss_manner) { int shutdown_slowly = server_mode(get_options()); log_notice(LD_CONTROL, "Owning controller %s has %s -- %s.", owner_type, loss_manner, shutdown_slowly ? "shutting down" : "exiting now"); /* XXXX Perhaps this chunk of code should be a separate function, * called here and by process_signal(SIGINT). */ if (!shutdown_slowly) { tor_cleanup(); exit(0); } /* XXXX This will close all listening sockets except control-port * listeners. Perhaps we should close those too. */ hibernate_begin_shutdown(); } /** Called when conn is being freed. */ void connection_control_closed(control_connection_t *conn) { tor_assert(conn); conn->event_mask = 0; control_update_global_event_mask(); if (conn->is_owning_control_connection) { lost_owning_controller("connection", "closed"); } } /** Return true iff cmd is allowable (or at least forgivable) at this * stage of the protocol. */ static int is_valid_initial_command(control_connection_t *conn, const char *cmd) { if (conn->_base.state == CONTROL_CONN_STATE_OPEN) return 1; if (!strcasecmp(cmd, "PROTOCOLINFO")) return !conn->have_sent_protocolinfo; if (!strcasecmp(cmd, "AUTHENTICATE") || !strcasecmp(cmd, "QUIT")) return 1; return 0; } /** Do not accept any control command of more than 1MB in length. Anything * that needs to be anywhere near this long probably means that one of our * interfaces is broken. */ #define MAX_COMMAND_LINE_LENGTH (1024*1024) static int peek_connection_has_control0_command(connection_t *conn) { IF_HAS_BUFFEREVENT(conn, { struct evbuffer *input = bufferevent_get_input(conn->bufev); return peek_evbuffer_has_control0_command(input); }) ELSE_IF_NO_BUFFEREVENT { return peek_buf_has_control0_command(conn->inbuf); } } /** Called when data has arrived on a v1 control connection: Try to fetch * commands from conn->inbuf, and execute them. */ int connection_control_process_inbuf(control_connection_t *conn) { size_t data_len; uint32_t cmd_data_len; int cmd_len; char *args; tor_assert(conn); tor_assert(conn->_base.state == CONTROL_CONN_STATE_OPEN || conn->_base.state == CONTROL_CONN_STATE_NEEDAUTH); if (!conn->incoming_cmd) { conn->incoming_cmd = tor_malloc(1024); conn->incoming_cmd_len = 1024; conn->incoming_cmd_cur_len = 0; } if (conn->_base.state == CONTROL_CONN_STATE_NEEDAUTH && peek_connection_has_control0_command(TO_CONN(conn))) { /* Detect v0 commands and send a "no more v0" message. */ size_t body_len; char buf[128]; set_uint16(buf+2, htons(0x0000)); /* type == error */ set_uint16(buf+4, htons(0x0001)); /* code == internal error */ strlcpy(buf+6, "The v0 control protocol is not supported by Tor 0.1.2.17 " "and later; upgrade your controller.", sizeof(buf)-6); body_len = 2+strlen(buf+6)+2; /* code, msg, nul. */ set_uint16(buf+0, htons(body_len)); connection_write_to_buf(buf, 4+body_len, TO_CONN(conn)); connection_mark_and_flush(TO_CONN(conn)); return 0; } again: while (1) { size_t last_idx; int r; /* First, fetch a line. */ do { data_len = conn->incoming_cmd_len - conn->incoming_cmd_cur_len; r = connection_fetch_from_buf_line(TO_CONN(conn), conn->incoming_cmd+conn->incoming_cmd_cur_len, &data_len); if (r == 0) /* Line not all here yet. Wait. */ return 0; else if (r == -1) { if (data_len + conn->incoming_cmd_cur_len > MAX_COMMAND_LINE_LENGTH) { connection_write_str_to_buf("500 Line too long.\r\n", conn); connection_stop_reading(TO_CONN(conn)); connection_mark_and_flush(TO_CONN(conn)); } while (conn->incoming_cmd_len < data_len+conn->incoming_cmd_cur_len) conn->incoming_cmd_len *= 2; conn->incoming_cmd = tor_realloc(conn->incoming_cmd, conn->incoming_cmd_len); } } while (r != 1); tor_assert(data_len); last_idx = conn->incoming_cmd_cur_len; conn->incoming_cmd_cur_len += (int)data_len; /* We have appended a line to incoming_cmd. Is the command done? */ if (last_idx == 0 && *conn->incoming_cmd != '+') /* One line command, didn't start with '+'. */ break; /* XXXX this code duplication is kind of dumb. */ if (last_idx+3 == conn->incoming_cmd_cur_len && tor_memeq(conn->incoming_cmd + last_idx, ".\r\n", 3)) { /* Just appended ".\r\n"; we're done. Remove it. */ conn->incoming_cmd[last_idx] = '\0'; conn->incoming_cmd_cur_len -= 3; break; } else if (last_idx+2 == conn->incoming_cmd_cur_len && tor_memeq(conn->incoming_cmd + last_idx, ".\n", 2)) { /* Just appended ".\n"; we're done. Remove it. */ conn->incoming_cmd[last_idx] = '\0'; conn->incoming_cmd_cur_len -= 2; break; } /* Otherwise, read another line. */ } data_len = conn->incoming_cmd_cur_len; /* Okay, we now have a command sitting on conn->incoming_cmd. See if we * recognize it. */ cmd_len = 0; while ((size_t)cmd_len < data_len && !TOR_ISSPACE(conn->incoming_cmd[cmd_len])) ++cmd_len; conn->incoming_cmd[cmd_len]='\0'; args = conn->incoming_cmd+cmd_len+1; tor_assert(data_len>(size_t)cmd_len); data_len -= (cmd_len+1); /* skip the command and NUL we added after it */ while (*args == ' ' || *args == '\t') { ++args; --data_len; } /* If the connection is already closing, ignore further commands */ if (TO_CONN(conn)->marked_for_close) { return 0; } /* Otherwise, Quit is always valid. */ if (!strcasecmp(conn->incoming_cmd, "QUIT")) { connection_write_str_to_buf("250 closing connection\r\n", conn); connection_mark_and_flush(TO_CONN(conn)); return 0; } if (conn->_base.state == CONTROL_CONN_STATE_NEEDAUTH && !is_valid_initial_command(conn, conn->incoming_cmd)) { connection_write_str_to_buf("514 Authentication required.\r\n", conn); connection_mark_for_close(TO_CONN(conn)); return 0; } if (data_len >= UINT32_MAX) { connection_write_str_to_buf("500 A 4GB command? Nice try.\r\n", conn); connection_mark_for_close(TO_CONN(conn)); return 0; } /* XXXX Why is this not implemented as a table like the GETINFO * items are? Even handling the plus signs at the beginnings of * commands wouldn't be very hard with proper macros. */ cmd_data_len = (uint32_t)data_len; if (!strcasecmp(conn->incoming_cmd, "SETCONF")) { if (handle_control_setconf(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "RESETCONF")) { if (handle_control_resetconf(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "GETCONF")) { if (handle_control_getconf(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "+LOADCONF")) { if (handle_control_loadconf(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "SETEVENTS")) { if (handle_control_setevents(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "AUTHENTICATE")) { if (handle_control_authenticate(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "SAVECONF")) { if (handle_control_saveconf(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "SIGNAL")) { if (handle_control_signal(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "TAKEOWNERSHIP")) { if (handle_control_takeownership(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "MAPADDRESS")) { if (handle_control_mapaddress(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "GETINFO")) { if (handle_control_getinfo(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "EXTENDCIRCUIT")) { if (handle_control_extendcircuit(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "SETCIRCUITPURPOSE")) { if (handle_control_setcircuitpurpose(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "SETROUTERPURPOSE")) { connection_write_str_to_buf("511 SETROUTERPURPOSE is obsolete.\r\n", conn); } else if (!strcasecmp(conn->incoming_cmd, "ATTACHSTREAM")) { if (handle_control_attachstream(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "+POSTDESCRIPTOR")) { if (handle_control_postdescriptor(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "REDIRECTSTREAM")) { if (handle_control_redirectstream(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "CLOSESTREAM")) { if (handle_control_closestream(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "CLOSECIRCUIT")) { if (handle_control_closecircuit(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "USEFEATURE")) { if (handle_control_usefeature(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "RESOLVE")) { if (handle_control_resolve(conn, cmd_data_len, args)) return -1; } else if (!strcasecmp(conn->incoming_cmd, "PROTOCOLINFO")) { if (handle_control_protocolinfo(conn, cmd_data_len, args)) return -1; } else { connection_printf_to_buf(conn, "510 Unrecognized command \"%s\"\r\n", conn->incoming_cmd); } conn->incoming_cmd_cur_len = 0; goto again; } /** Something has happened to circuit circ: tell any interested * control connections. */ int control_event_circuit_status(origin_circuit_t *circ, circuit_status_event_t tp, int reason_code) { const char *status; char extended_buf[96]; if (!EVENT_IS_INTERESTING(EVENT_CIRCUIT_STATUS)) return 0; tor_assert(circ); switch (tp) { case CIRC_EVENT_LAUNCHED: status = "LAUNCHED"; break; case CIRC_EVENT_BUILT: status = "BUILT"; break; case CIRC_EVENT_EXTENDED: status = "EXTENDED"; break; case CIRC_EVENT_FAILED: status = "FAILED"; break; case CIRC_EVENT_CLOSED: status = "CLOSED"; break; default: log_warn(LD_BUG, "Unrecognized status code %d", (int)tp); return 0; } tor_snprintf(extended_buf, sizeof(extended_buf), "PURPOSE=%s", circuit_purpose_to_controller_string(circ->_base.purpose)); if (tp == CIRC_EVENT_FAILED || tp == CIRC_EVENT_CLOSED) { const char *reason_str = circuit_end_reason_to_control_string(reason_code); char *reason = NULL; size_t n=strlen(extended_buf); if (!reason_str) { reason = tor_malloc(16); tor_snprintf(reason, 16, "UNKNOWN_%d", reason_code); reason_str = reason; } if (reason_code > 0 && reason_code & END_CIRC_REASON_FLAG_REMOTE) { tor_snprintf(extended_buf+n, sizeof(extended_buf)-n, " REASON=DESTROYED REMOTE_REASON=%s", reason_str); } else { tor_snprintf(extended_buf+n, sizeof(extended_buf)-n, " REASON=%s", reason_str); } tor_free(reason); } { char *vpath = circuit_list_path_for_controller(circ); const char *sp = strlen(vpath) ? " " : ""; send_control_event(EVENT_CIRCUIT_STATUS, ALL_FORMATS, "650 CIRC %lu %s%s%s %s\r\n", (unsigned long)circ->global_identifier, status, sp, vpath, extended_buf); tor_free(vpath); } return 0; } /** Given an AP connection conn and a len-character buffer * buf, determine the address:port combination requested on * conn, and write it to buf. Return 0 on success, -1 on * failure. */ static int write_stream_target_to_buf(entry_connection_t *conn, char *buf, size_t len) { char buf2[256]; if (conn->chosen_exit_name) if (tor_snprintf(buf2, sizeof(buf2), ".%s.exit", conn->chosen_exit_name)<0) return -1; if (!conn->socks_request) return -1; if (tor_snprintf(buf, len, "%s%s%s:%d", conn->socks_request->address, conn->chosen_exit_name ? buf2 : "", !conn->chosen_exit_name && connection_edge_is_rendezvous_stream( ENTRY_TO_EDGE_CONN(conn)) ? ".onion" : "", conn->socks_request->port)<0) return -1; return 0; } /** Something has happened to the stream associated with AP connection * conn: tell any interested control connections. */ int control_event_stream_status(entry_connection_t *conn, stream_status_event_t tp, int reason_code) { char reason_buf[64]; char addrport_buf[64]; const char *status; circuit_t *circ; origin_circuit_t *origin_circ = NULL; char buf[256]; const char *purpose = ""; tor_assert(conn->socks_request); if (!EVENT_IS_INTERESTING(EVENT_STREAM_STATUS)) return 0; if (tp == STREAM_EVENT_CLOSED && (reason_code & END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED)) return 0; write_stream_target_to_buf(conn, buf, sizeof(buf)); reason_buf[0] = '\0'; switch (tp) { case STREAM_EVENT_SENT_CONNECT: status = "SENTCONNECT"; break; case STREAM_EVENT_SENT_RESOLVE: status = "SENTRESOLVE"; break; case STREAM_EVENT_SUCCEEDED: status = "SUCCEEDED"; break; case STREAM_EVENT_FAILED: status = "FAILED"; break; case STREAM_EVENT_CLOSED: status = "CLOSED"; break; case STREAM_EVENT_NEW: status = "NEW"; break; case STREAM_EVENT_NEW_RESOLVE: status = "NEWRESOLVE"; break; case STREAM_EVENT_FAILED_RETRIABLE: status = "DETACHED"; break; case STREAM_EVENT_REMAP: status = "REMAP"; break; default: log_warn(LD_BUG, "Unrecognized status code %d", (int)tp); return 0; } if (reason_code && (tp == STREAM_EVENT_FAILED || tp == STREAM_EVENT_CLOSED || tp == STREAM_EVENT_FAILED_RETRIABLE)) { const char *reason_str = stream_end_reason_to_control_string(reason_code); char *r = NULL; if (!reason_str) { r = tor_malloc(16); tor_snprintf(r, 16, " UNKNOWN_%d", reason_code); reason_str = r; } if (reason_code & END_STREAM_REASON_FLAG_REMOTE) tor_snprintf(reason_buf, sizeof(reason_buf), " REASON=END REMOTE_REASON=%s", reason_str); else tor_snprintf(reason_buf, sizeof(reason_buf), " REASON=%s", reason_str); tor_free(r); } else if (reason_code && tp == STREAM_EVENT_REMAP) { switch (reason_code) { case REMAP_STREAM_SOURCE_CACHE: strlcpy(reason_buf, " SOURCE=CACHE", sizeof(reason_buf)); break; case REMAP_STREAM_SOURCE_EXIT: strlcpy(reason_buf, " SOURCE=EXIT", sizeof(reason_buf)); break; default: tor_snprintf(reason_buf, sizeof(reason_buf), " REASON=UNKNOWN_%d", reason_code); /* XXX do we want SOURCE=UNKNOWN_%d above instead? -RD */ break; } } if (tp == STREAM_EVENT_NEW) { tor_snprintf(addrport_buf,sizeof(addrport_buf), " SOURCE_ADDR=%s:%d", ENTRY_TO_CONN(conn)->address, ENTRY_TO_CONN(conn)->port); } else { addrport_buf[0] = '\0'; } if (tp == STREAM_EVENT_NEW_RESOLVE) { purpose = " PURPOSE=DNS_REQUEST"; } else if (tp == STREAM_EVENT_NEW) { if (ENTRY_TO_EDGE_CONN(conn)->is_dns_request || (conn->socks_request && SOCKS_COMMAND_IS_RESOLVE(conn->socks_request->command))) purpose = " PURPOSE=DNS_REQUEST"; else if (conn->use_begindir) { connection_t *linked = ENTRY_TO_CONN(conn)->linked_conn; int linked_dir_purpose = -1; if (linked && linked->type == CONN_TYPE_DIR) linked_dir_purpose = linked->purpose; if (DIR_PURPOSE_IS_UPLOAD(linked_dir_purpose)) purpose = " PURPOSE=DIR_UPLOAD"; else purpose = " PURPOSE=DIR_FETCH"; } else purpose = " PURPOSE=USER"; } circ = circuit_get_by_edge_conn(ENTRY_TO_EDGE_CONN(conn)); if (circ && CIRCUIT_IS_ORIGIN(circ)) origin_circ = TO_ORIGIN_CIRCUIT(circ); send_control_event(EVENT_STREAM_STATUS, ALL_FORMATS, "650 STREAM "U64_FORMAT" %s %lu %s%s%s%s\r\n", U64_PRINTF_ARG(ENTRY_TO_CONN(conn)->global_identifier), status, origin_circ? (unsigned long)origin_circ->global_identifier : 0ul, buf, reason_buf, addrport_buf, purpose); /* XXX need to specify its intended exit, etc? */ return 0; } /** Figure out the best name for the target router of an OR connection * conn, and write it into the len-character buffer * name. */ static void orconn_target_get_name(char *name, size_t len, or_connection_t *conn) { const node_t *node = node_get_by_id(conn->identity_digest); if (node) { tor_assert(len > MAX_VERBOSE_NICKNAME_LEN); node_get_verbose_nickname(node, name); } else if (! tor_digest_is_zero(conn->identity_digest)) { name[0] = '$'; base16_encode(name+1, len-1, conn->identity_digest, DIGEST_LEN); } else { tor_snprintf(name, len, "%s:%d", conn->_base.address, conn->_base.port); } } /** Called when the status of an OR connection conn changes: tell any * interested control connections. tp is the new status for the * connection. If conn has just closed or failed, then reason * may be the reason why. */ int control_event_or_conn_status(or_connection_t *conn, or_conn_status_event_t tp, int reason) { int ncircs = 0; const char *status; char name[128]; char ncircs_buf[32] = {0}; /* > 8 + log10(2^32)=10 + 2 */ if (!EVENT_IS_INTERESTING(EVENT_OR_CONN_STATUS)) return 0; switch (tp) { case OR_CONN_EVENT_LAUNCHED: status = "LAUNCHED"; break; case OR_CONN_EVENT_CONNECTED: status = "CONNECTED"; break; case OR_CONN_EVENT_FAILED: status = "FAILED"; break; case OR_CONN_EVENT_CLOSED: status = "CLOSED"; break; case OR_CONN_EVENT_NEW: status = "NEW"; break; default: log_warn(LD_BUG, "Unrecognized status code %d", (int)tp); return 0; } ncircs = circuit_count_pending_on_or_conn(conn); ncircs += conn->n_circuits; if (ncircs && (tp == OR_CONN_EVENT_FAILED || tp == OR_CONN_EVENT_CLOSED)) { tor_snprintf(ncircs_buf, sizeof(ncircs_buf), "%sNCIRCS=%d", reason ? " " : "", ncircs); } orconn_target_get_name(name, sizeof(name), conn); send_control_event(EVENT_OR_CONN_STATUS, ALL_FORMATS, "650 ORCONN %s %s %s%s%s\r\n", name, status, reason ? "REASON=" : "", orconn_end_reason_to_control_string(reason), ncircs_buf); return 0; } /** * Print out STREAM_BW event for a single conn */ int control_event_stream_bandwidth(edge_connection_t *edge_conn) { if (EVENT_IS_INTERESTING(EVENT_STREAM_BANDWIDTH_USED)) { if (!edge_conn->n_read && !edge_conn->n_written) return 0; send_control_event(EVENT_STREAM_BANDWIDTH_USED, ALL_FORMATS, "650 STREAM_BW "U64_FORMAT" %lu %lu\r\n", U64_PRINTF_ARG(edge_conn->_base.global_identifier), (unsigned long)edge_conn->n_read, (unsigned long)edge_conn->n_written); edge_conn->n_written = edge_conn->n_read = 0; } return 0; } /** A second or more has elapsed: tell any interested control * connections how much bandwidth streams have used. */ int control_event_stream_bandwidth_used(void) { if (EVENT_IS_INTERESTING(EVENT_STREAM_BANDWIDTH_USED)) { smartlist_t *conns = get_connection_array(); edge_connection_t *edge_conn; SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) { if (conn->type != CONN_TYPE_AP) continue; edge_conn = TO_EDGE_CONN(conn); if (!edge_conn->n_read && !edge_conn->n_written) continue; send_control_event(EVENT_STREAM_BANDWIDTH_USED, ALL_FORMATS, "650 STREAM_BW "U64_FORMAT" %lu %lu\r\n", U64_PRINTF_ARG(edge_conn->_base.global_identifier), (unsigned long)edge_conn->n_read, (unsigned long)edge_conn->n_written); edge_conn->n_written = edge_conn->n_read = 0; } SMARTLIST_FOREACH_END(conn); } return 0; } /** A second or more has elapsed: tell any interested control * connections how much bandwidth we used. */ int control_event_bandwidth_used(uint32_t n_read, uint32_t n_written) { if (EVENT_IS_INTERESTING(EVENT_BANDWIDTH_USED)) { send_control_event(EVENT_BANDWIDTH_USED, ALL_FORMATS, "650 BW %lu %lu\r\n", (unsigned long)n_read, (unsigned long)n_written); } return 0; } /** Called when we are sending a log message to the controllers: suspend * sending further log messages to the controllers until we're done. Used by * CONN_LOG_PROTECT. */ void disable_control_logging(void) { ++disable_log_messages; } /** We're done sending a log message to the controllers: re-enable controller * logging. Used by CONN_LOG_PROTECT. */ void enable_control_logging(void) { if (--disable_log_messages < 0) tor_assert(0); } /** We got a log message: tell any interested control connections. */ void control_event_logmsg(int severity, uint32_t domain, const char *msg) { int event; /* Don't even think of trying to add stuff to a buffer from a cpuworker * thread. */ if (! in_main_thread()) return; if (disable_log_messages) return; if (domain == LD_BUG && EVENT_IS_INTERESTING(EVENT_STATUS_GENERAL) && severity <= LOG_NOTICE) { char *esc = esc_for_log(msg); ++disable_log_messages; control_event_general_status(severity, "BUG REASON=%s", esc); --disable_log_messages; tor_free(esc); } event = log_severity_to_event(severity); if (event >= 0 && EVENT_IS_INTERESTING(event)) { char *b = NULL; const char *s; if (strchr(msg, '\n')) { char *cp; b = tor_strdup(msg); for (cp = b; *cp; ++cp) if (*cp == '\r' || *cp == '\n') *cp = ' '; } switch (severity) { case LOG_DEBUG: s = "DEBUG"; break; case LOG_INFO: s = "INFO"; break; case LOG_NOTICE: s = "NOTICE"; break; case LOG_WARN: s = "WARN"; break; case LOG_ERR: s = "ERR"; break; default: s = "UnknownLogSeverity"; break; } ++disable_log_messages; send_control_event(event, ALL_FORMATS, "650 %s %s\r\n", s, b?b:msg); --disable_log_messages; tor_free(b); } } /** Called whenever we receive new router descriptors: tell any * interested control connections. routers is a list of * routerinfo_t's. */ int control_event_descriptors_changed(smartlist_t *routers) { char *msg; if (!EVENT_IS_INTERESTING(EVENT_NEW_DESC)) return 0; { smartlist_t *names = smartlist_create(); char *ids; size_t names_len; SMARTLIST_FOREACH(routers, routerinfo_t *, ri, { char *b = tor_malloc(MAX_VERBOSE_NICKNAME_LEN+1); router_get_verbose_nickname(b, ri); smartlist_add(names, b); }); ids = smartlist_join_strings(names, " ", 0, &names_len); names_len = strlen(ids)+32; msg = tor_malloc(names_len); tor_snprintf(msg, names_len, "650 NEWDESC %s\r\n", ids); send_control_event_string(EVENT_NEW_DESC, ALL_FORMATS, msg); tor_free(ids); tor_free(msg); SMARTLIST_FOREACH(names, char *, cp, tor_free(cp)); smartlist_free(names); } return 0; } /** Called when an address mapping on from from changes to to. * expires values less than 3 are special; see connection_edge.c. If * error is non-NULL, it is an error code describing the failure * mode of the mapping. */ int control_event_address_mapped(const char *from, const char *to, time_t expires, const char *error) { if (!EVENT_IS_INTERESTING(EVENT_ADDRMAP)) return 0; if (expires < 3 || expires == TIME_MAX) send_control_event(EVENT_ADDRMAP, ALL_FORMATS, "650 ADDRMAP %s %s NEVER %s\r\n", from, to, error?error:""); else { char buf[ISO_TIME_LEN+1]; char buf2[ISO_TIME_LEN+1]; format_local_iso_time(buf,expires); format_iso_time(buf2,expires); send_control_event(EVENT_ADDRMAP, ALL_FORMATS, "650 ADDRMAP %s %s \"%s\"" " %s%sEXPIRES=\"%s\"\r\n", from, to, buf, error?error:"", error?" ":"", buf2); } return 0; } /** The authoritative dirserver has received a new descriptor that * has passed basic syntax checks and is properly self-signed. * * Notify any interested party of the new descriptor and what has * been done with it, and also optionally give an explanation/reason. */ int control_event_or_authdir_new_descriptor(const char *action, const char *desc, size_t desclen, const char *msg) { char firstline[1024]; char *buf; size_t totallen; char *esc = NULL; size_t esclen; if (!EVENT_IS_INTERESTING(EVENT_AUTHDIR_NEWDESCS)) return 0; tor_snprintf(firstline, sizeof(firstline), "650+AUTHDIR_NEWDESC=\r\n%s\r\n%s\r\n", action, msg ? msg : ""); /* Escape the server descriptor properly */ esclen = write_escaped_data(desc, desclen, &esc); totallen = strlen(firstline) + esclen + 1; buf = tor_malloc(totallen); strlcpy(buf, firstline, totallen); strlcpy(buf+strlen(firstline), esc, totallen); send_control_event_string(EVENT_AUTHDIR_NEWDESCS, ALL_FORMATS, buf); send_control_event_string(EVENT_AUTHDIR_NEWDESCS, ALL_FORMATS, "650 OK\r\n"); tor_free(esc); tor_free(buf); return 0; } /** Helper function for NS-style events. Constructs and sends an event * of type event with string event_string out of the set of * networkstatuses statuses. Currently it is used for NS events * and NEWCONSENSUS events. */ static int control_event_networkstatus_changed_helper(smartlist_t *statuses, uint16_t event, const char *event_string) { smartlist_t *strs; char *s, *esc = NULL; if (!EVENT_IS_INTERESTING(event) || !smartlist_len(statuses)) return 0; strs = smartlist_create(); smartlist_add(strs, tor_strdup("650+")); smartlist_add(strs, tor_strdup(event_string)); smartlist_add(strs, tor_strdup("\r\n")); SMARTLIST_FOREACH(statuses, const routerstatus_t *, rs, { s = networkstatus_getinfo_helper_single(rs); if (!s) continue; smartlist_add(strs, s); }); s = smartlist_join_strings(strs, "", 0, NULL); write_escaped_data(s, strlen(s), &esc); SMARTLIST_FOREACH(strs, char *, cp, tor_free(cp)); smartlist_free(strs); tor_free(s); send_control_event_string(event, ALL_FORMATS, esc); send_control_event_string(event, ALL_FORMATS, "650 OK\r\n"); tor_free(esc); return 0; } /** Called when the routerstatus_ts statuses have changed: sends * an NS event to any controller that cares. */ int control_event_networkstatus_changed(smartlist_t *statuses) { return control_event_networkstatus_changed_helper(statuses, EVENT_NS, "NS"); } /** Called when we get a new consensus networkstatus. Sends a NEWCONSENSUS * event consisting of an NS-style line for each relay in the consensus. */ int control_event_newconsensus(const networkstatus_t *consensus) { if (!control_event_is_interesting(EVENT_NEWCONSENSUS)) return 0; return control_event_networkstatus_changed_helper( consensus->routerstatus_list, EVENT_NEWCONSENSUS, "NEWCONSENSUS"); } /** Called when we compute a new circuitbuildtimeout */ int control_event_buildtimeout_set(const circuit_build_times_t *cbt, buildtimeout_set_event_t type) { const char *type_string = NULL; double qnt = circuit_build_times_quantile_cutoff(); if (!control_event_is_interesting(EVENT_BUILDTIMEOUT_SET)) return 0; switch (type) { case BUILDTIMEOUT_SET_EVENT_COMPUTED: type_string = "COMPUTED"; break; case BUILDTIMEOUT_SET_EVENT_RESET: type_string = "RESET"; qnt = 1.0; break; case BUILDTIMEOUT_SET_EVENT_SUSPENDED: type_string = "SUSPENDED"; qnt = 1.0; break; case BUILDTIMEOUT_SET_EVENT_DISCARD: type_string = "DISCARD"; qnt = 1.0; break; case BUILDTIMEOUT_SET_EVENT_RESUME: type_string = "RESUME"; break; default: type_string = "UNKNOWN"; break; } send_control_event(EVENT_BUILDTIMEOUT_SET, ALL_FORMATS, "650 BUILDTIMEOUT_SET %s TOTAL_TIMES=%lu " "TIMEOUT_MS=%lu XM=%lu ALPHA=%f CUTOFF_QUANTILE=%f " "TIMEOUT_RATE=%f CLOSE_MS=%lu CLOSE_RATE=%f\r\n", type_string, (unsigned long)cbt->total_build_times, (unsigned long)cbt->timeout_ms, (unsigned long)cbt->Xm, cbt->alpha, qnt, circuit_build_times_timeout_rate(cbt), (unsigned long)cbt->close_ms, circuit_build_times_close_rate(cbt)); return 0; } /** Called when a signal has been processed from signal_callback */ int control_event_signal(uintptr_t signal) { const char *signal_string = NULL; if (!control_event_is_interesting(EVENT_SIGNAL)) return 0; switch (signal) { case SIGHUP: signal_string = "RELOAD"; break; case SIGUSR1: signal_string = "DUMP"; break; case SIGUSR2: signal_string = "DEBUG"; break; case SIGNEWNYM: signal_string = "NEWNYM"; break; case SIGCLEARDNSCACHE: signal_string = "CLEARDNSCACHE"; break; default: log_warn(LD_BUG, "Unrecognized signal %lu in control_event_signal", (unsigned long)signal); return -1; } send_control_event(EVENT_SIGNAL, ALL_FORMATS, "650 SIGNAL %s\r\n", signal_string); return 0; } /** Called when a single local_routerstatus_t has changed: Sends an NS event * to any controller that cares. */ int control_event_networkstatus_changed_single(const routerstatus_t *rs) { smartlist_t *statuses; int r; if (!EVENT_IS_INTERESTING(EVENT_NS)) return 0; statuses = smartlist_create(); smartlist_add(statuses, (void*)rs); r = control_event_networkstatus_changed(statuses); smartlist_free(statuses); return r; } /** Our own router descriptor has changed; tell any controllers that care. */ int control_event_my_descriptor_changed(void) { send_control_event(EVENT_DESCCHANGED, ALL_FORMATS, "650 DESCCHANGED\r\n"); return 0; } /** Helper: sends a status event where type is one of * EVENT_STATUS_{GENERAL,CLIENT,SERVER}, where severity is one of * LOG_{NOTICE,WARN,ERR}, and where format is a printf-style format * string corresponding to args. */ static int control_event_status(int type, int severity, const char *format, va_list args) { char format_buf[160]; const char *status, *sev; switch (type) { case EVENT_STATUS_GENERAL: status = "STATUS_GENERAL"; break; case EVENT_STATUS_CLIENT: status = "STATUS_CLIENT"; break; case EVENT_STATUS_SERVER: status = "STATUS_SERVER"; break; default: log_warn(LD_BUG, "Unrecognized status type %d", type); return -1; } switch (severity) { case LOG_NOTICE: sev = "NOTICE"; break; case LOG_WARN: sev = "WARN"; break; case LOG_ERR: sev = "ERR"; break; default: log_warn(LD_BUG, "Unrecognized status severity %d", severity); return -1; } if (tor_snprintf(format_buf, sizeof(format_buf), "650 %s %s %s\r\n", status, sev, format)<0) { log_warn(LD_BUG, "Format string too long."); return -1; } send_control_event_impl(type, ALL_FORMATS, format_buf, args); return 0; } /** Format and send an EVENT_STATUS_GENERAL event whose main text is obtained * by formatting the arguments using the printf-style format. */ int control_event_general_status(int severity, const char *format, ...) { va_list ap; int r; if (!EVENT_IS_INTERESTING(EVENT_STATUS_GENERAL)) return 0; va_start(ap, format); r = control_event_status(EVENT_STATUS_GENERAL, severity, format, ap); va_end(ap); return r; } /** Format and send an EVENT_STATUS_CLIENT event whose main text is obtained * by formatting the arguments using the printf-style format. */ int control_event_client_status(int severity, const char *format, ...) { va_list ap; int r; if (!EVENT_IS_INTERESTING(EVENT_STATUS_CLIENT)) return 0; va_start(ap, format); r = control_event_status(EVENT_STATUS_CLIENT, severity, format, ap); va_end(ap); return r; } /** Format and send an EVENT_STATUS_SERVER event whose main text is obtained * by formatting the arguments using the printf-style format. */ int control_event_server_status(int severity, const char *format, ...) { va_list ap; int r; if (!EVENT_IS_INTERESTING(EVENT_STATUS_SERVER)) return 0; va_start(ap, format); r = control_event_status(EVENT_STATUS_SERVER, severity, format, ap); va_end(ap); return r; } /** Called when the status of an entry guard with the given nickname * and identity digest has changed to status: tells any * controllers that care. */ int control_event_guard(const char *nickname, const char *digest, const char *status) { char hbuf[HEX_DIGEST_LEN+1]; base16_encode(hbuf, sizeof(hbuf), digest, DIGEST_LEN); if (!EVENT_IS_INTERESTING(EVENT_GUARD)) return 0; { char buf[MAX_VERBOSE_NICKNAME_LEN+1]; const node_t *node = node_get_by_id(digest); if (node) { node_get_verbose_nickname(node, buf); } else { tor_snprintf(buf, sizeof(buf), "$%s~%s", hbuf, nickname); } send_control_event(EVENT_GUARD, ALL_FORMATS, "650 GUARD ENTRY %s %s\r\n", buf, status); } return 0; } /** Called when a configuration option changes. This is generally triggered * by SETCONF requests and RELOAD/SIGHUP signals. The elements is * a smartlist_t containing (key, value, ...) pairs in sequence. * value can be NULL. */ int control_event_conf_changed(smartlist_t *elements) { int i; char *result; smartlist_t *lines; if (!EVENT_IS_INTERESTING(EVENT_CONF_CHANGED) || smartlist_len(elements) == 0) { return 0; } lines = smartlist_create(); for (i = 0; i < smartlist_len(elements); i += 2) { char *k = smartlist_get(elements, i); char *v = smartlist_get(elements, i+1); if (v == NULL) { smartlist_asprintf_add(lines, "650-%s", k); } else { smartlist_asprintf_add(lines, "650-%s=%s", k, v); } } result = smartlist_join_strings(lines, "\r\n", 0, NULL); send_control_event(EVENT_CONF_CHANGED, 0, "650-CONF_CHANGED\r\n%s\r\n650 OK\r\n", result); tor_free(result); SMARTLIST_FOREACH(lines, char *, cp, tor_free(cp)); smartlist_free(lines); return 0; } /** Helper: Return a newly allocated string containing a path to the * file where we store our authentication cookie. */ static char * get_cookie_file(void) { const or_options_t *options = get_options(); if (options->CookieAuthFile && strlen(options->CookieAuthFile)) { return tor_strdup(options->CookieAuthFile); } else { return get_datadir_fname("control_auth_cookie"); } } /** Choose a random authentication cookie and write it to disk. * Anybody who can read the cookie from disk will be considered * authorized to use the control connection. Return -1 if we can't * write the file, or 0 on success. */ int init_cookie_authentication(int enabled) { char *fname; if (!enabled) { authentication_cookie_is_set = 0; return 0; } /* We don't want to generate a new cookie every time we call * options_act(). One should be enough. */ if (authentication_cookie_is_set) return 0; /* all set */ fname = get_cookie_file(); crypto_rand(authentication_cookie, AUTHENTICATION_COOKIE_LEN); authentication_cookie_is_set = 1; if (write_bytes_to_file(fname, authentication_cookie, AUTHENTICATION_COOKIE_LEN, 1)) { log_warn(LD_FS,"Error writing authentication cookie to %s.", escaped(fname)); tor_free(fname); return -1; } #ifndef MS_WINDOWS if (get_options()->CookieAuthFileGroupReadable) { if (chmod(fname, 0640)) { log_warn(LD_FS,"Unable to make %s group-readable.", escaped(fname)); } } #endif tor_free(fname); return 0; } /** A copy of the process specifier of Tor's owning controller, or * NULL if this Tor instance is not currently owned by a process. */ static char *owning_controller_process_spec = NULL; /** A process-termination monitor for Tor's owning controller, or NULL * if this Tor instance is not currently owned by a process. */ static tor_process_monitor_t *owning_controller_process_monitor = NULL; /** Process-termination monitor callback for Tor's owning controller * process. */ static void owning_controller_procmon_cb(void *unused) { (void)unused; lost_owning_controller("process", "vanished"); } /** Set process_spec as Tor's owning controller process. * Exit on failure. */ void monitor_owning_controller_process(const char *process_spec) { const char *msg; tor_assert((owning_controller_process_spec == NULL) == (owning_controller_process_monitor == NULL)); if (owning_controller_process_spec != NULL) { if ((process_spec != NULL) && !strcmp(process_spec, owning_controller_process_spec)) { /* Same process -- return now, instead of disposing of and * recreating the process-termination monitor. */ return; } /* We are currently owned by a process, and we should no longer be * owned by it. Free the process-termination monitor. */ tor_process_monitor_free(owning_controller_process_monitor); owning_controller_process_monitor = NULL; tor_free(owning_controller_process_spec); owning_controller_process_spec = NULL; } tor_assert((owning_controller_process_spec == NULL) && (owning_controller_process_monitor == NULL)); if (process_spec == NULL) return; owning_controller_process_spec = tor_strdup(process_spec); owning_controller_process_monitor = tor_process_monitor_new(tor_libevent_get_base(), owning_controller_process_spec, LD_CONTROL, owning_controller_procmon_cb, NULL, &msg); if (owning_controller_process_monitor == NULL) { log_err(LD_BUG, "Couldn't create process-termination monitor for " "owning controller: %s. Exiting.", msg); owning_controller_process_spec = NULL; tor_cleanup(); exit(0); } } /** Convert the name of a bootstrapping phase s into strings * tag and summary suitable for display by the controller. */ static int bootstrap_status_to_string(bootstrap_status_t s, const char **tag, const char **summary) { switch (s) { case BOOTSTRAP_STATUS_UNDEF: *tag = "undef"; *summary = "Undefined"; break; case BOOTSTRAP_STATUS_STARTING: *tag = "starting"; *summary = "Starting"; break; case BOOTSTRAP_STATUS_CONN_DIR: *tag = "conn_dir"; *summary = "Connecting to directory server"; break; case BOOTSTRAP_STATUS_HANDSHAKE: *tag = "status_handshake"; *summary = "Finishing handshake"; break; case BOOTSTRAP_STATUS_HANDSHAKE_DIR: *tag = "handshake_dir"; *summary = "Finishing handshake with directory server"; break; case BOOTSTRAP_STATUS_ONEHOP_CREATE: *tag = "onehop_create"; *summary = "Establishing an encrypted directory connection"; break; case BOOTSTRAP_STATUS_REQUESTING_STATUS: *tag = "requesting_status"; *summary = "Asking for networkstatus consensus"; break; case BOOTSTRAP_STATUS_LOADING_STATUS: *tag = "loading_status"; *summary = "Loading networkstatus consensus"; break; case BOOTSTRAP_STATUS_LOADING_KEYS: *tag = "loading_keys"; *summary = "Loading authority key certs"; break; case BOOTSTRAP_STATUS_REQUESTING_DESCRIPTORS: *tag = "requesting_descriptors"; *summary = "Asking for relay descriptors"; break; case BOOTSTRAP_STATUS_LOADING_DESCRIPTORS: *tag = "loading_descriptors"; *summary = "Loading relay descriptors"; break; case BOOTSTRAP_STATUS_CONN_OR: *tag = "conn_or"; *summary = "Connecting to the Tor network"; break; case BOOTSTRAP_STATUS_HANDSHAKE_OR: *tag = "handshake_or"; *summary = "Finishing handshake with first hop"; break; case BOOTSTRAP_STATUS_CIRCUIT_CREATE: *tag = "circuit_create"; *summary = "Establishing a Tor circuit"; break; case BOOTSTRAP_STATUS_DONE: *tag = "done"; *summary = "Done"; break; default: // log_warn(LD_BUG, "Unrecognized bootstrap status code %d", s); *tag = *summary = "unknown"; return -1; } return 0; } /** What percentage through the bootstrap process are we? We remember * this so we can avoid sending redundant bootstrap status events, and * so we can guess context for the bootstrap messages which are * ambiguous. It starts at 'undef', but gets set to 'starting' while * Tor initializes. */ static int bootstrap_percent = BOOTSTRAP_STATUS_UNDEF; /** How many problems have we had getting to the next bootstrapping phase? * These include failure to establish a connection to a Tor relay, * failures to finish the TLS handshake, failures to validate the * consensus document, etc. */ static int bootstrap_problems = 0; /* We only tell the controller once we've hit a threshold of problems * for the current phase. */ #define BOOTSTRAP_PROBLEM_THRESHOLD 10 /** Called when Tor has made progress at bootstrapping its directory * information and initial circuits. * * status is the new status, that is, what task we will be doing * next. progress is zero if we just started this task, else it * represents progress on the task. */ void control_event_bootstrap(bootstrap_status_t status, int progress) { const char *tag, *summary; char buf[BOOTSTRAP_MSG_LEN]; if (bootstrap_percent == BOOTSTRAP_STATUS_DONE) return; /* already bootstrapped; nothing to be done here. */ /* special case for handshaking status, since our TLS handshaking code * can't distinguish what the connection is going to be for. */ if (status == BOOTSTRAP_STATUS_HANDSHAKE) { if (bootstrap_percent < BOOTSTRAP_STATUS_CONN_OR) { status = BOOTSTRAP_STATUS_HANDSHAKE_DIR; } else { status = BOOTSTRAP_STATUS_HANDSHAKE_OR; } } if (status > bootstrap_percent || (progress && progress > bootstrap_percent)) { bootstrap_status_to_string(status, &tag, &summary); log(status ? LOG_NOTICE : LOG_INFO, LD_CONTROL, "Bootstrapped %d%%: %s.", progress ? progress : status, summary); tor_snprintf(buf, sizeof(buf), "BOOTSTRAP PROGRESS=%d TAG=%s SUMMARY=\"%s\"", progress ? progress : status, tag, summary); tor_snprintf(last_sent_bootstrap_message, sizeof(last_sent_bootstrap_message), "NOTICE %s", buf); control_event_client_status(LOG_NOTICE, "%s", buf); if (status > bootstrap_percent) { bootstrap_percent = status; /* new milestone reached */ } if (progress > bootstrap_percent) { /* incremental progress within a milestone */ bootstrap_percent = progress; bootstrap_problems = 0; /* Progress! Reset our problem counter. */ } } } /** Called when Tor has failed to make bootstrapping progress in a way * that indicates a problem. warn gives a hint as to why, and * reason provides an "or_conn_end_reason" tag. */ void control_event_bootstrap_problem(const char *warn, int reason) { int status = bootstrap_percent; const char *tag, *summary; char buf[BOOTSTRAP_MSG_LEN]; const char *recommendation = "ignore"; int severity; /* bootstrap_percent must not be in "undefined" state here. */ tor_assert(status >= 0); if (bootstrap_percent == 100) return; /* already bootstrapped; nothing to be done here. */ bootstrap_problems++; if (bootstrap_problems >= BOOTSTRAP_PROBLEM_THRESHOLD) recommendation = "warn"; if (reason == END_OR_CONN_REASON_NO_ROUTE) recommendation = "warn"; if (get_options()->UseBridges && !any_bridge_descriptors_known() && !any_pending_bridge_descriptor_fetches()) recommendation = "warn"; while (status>=0 && bootstrap_status_to_string(status, &tag, &summary) < 0) status--; /* find a recognized status string based on current progress */ status = bootstrap_percent; /* set status back to the actual number */ severity = !strcmp(recommendation, "warn") ? LOG_WARN : LOG_INFO; log_fn(severity, LD_CONTROL, "Problem bootstrapping. Stuck at %d%%: %s. (%s; %s; " "count %d; recommendation %s)", status, summary, warn, orconn_end_reason_to_control_string(reason), bootstrap_problems, recommendation); connection_or_report_broken_states(severity, LD_HANDSHAKE); tor_snprintf(buf, sizeof(buf), "BOOTSTRAP PROGRESS=%d TAG=%s SUMMARY=\"%s\" WARNING=\"%s\" REASON=%s " "COUNT=%d RECOMMENDATION=%s", bootstrap_percent, tag, summary, warn, orconn_end_reason_to_control_string(reason), bootstrap_problems, recommendation); tor_snprintf(last_sent_bootstrap_message, sizeof(last_sent_bootstrap_message), "WARN %s", buf); control_event_client_status(LOG_WARN, "%s", buf); } /** We just generated a new summary of which countries we've seen clients * from recently. Send a copy to the controller in case it wants to * display it for the user. */ void control_event_clients_seen(const char *controller_str) { send_control_event(EVENT_CLIENTS_SEEN, 0, "650 CLIENTS_SEEN %s\r\n", controller_str); }