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- /* Copyright (c) 2001 Matej Pfajfar.
- * Copyright (c) 2001-2004, Roger Dingledine.
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- const char main_c_id[] =
- "$Id$";
- /**
- * \file main.c
- * \brief Toplevel module. Handles signals, multiplexes between
- * connections, implements main loop, and drives scheduled events.
- **/
- #include "or.h"
- #ifdef USE_DMALLOC
- #include <dmalloc.h>
- #endif
- /********* PROTOTYPES **********/
- static void dumpmemusage(int severity);
- static void dumpstats(int severity); /* log stats */
- static void conn_read_callback(int fd, short event, void *_conn);
- static void conn_write_callback(int fd, short event, void *_conn);
- static void signal_callback(int fd, short events, void *arg);
- static void second_elapsed_callback(int fd, short event, void *args);
- static int conn_close_if_marked(int i);
- /********* START VARIABLES **********/
- int global_read_bucket; /**< Max number of bytes I can read this second. */
- int global_write_bucket; /**< Max number of bytes I can write this second. */
- /** What was the read bucket before the last call to prepare_for_pool?
- * (used to determine how many bytes we've read). */
- static int stats_prev_global_read_bucket;
- /** What was the write bucket before the last call to prepare_for_pool?
- * (used to determine how many bytes we've written). */
- static int stats_prev_global_write_bucket;
- /** How many bytes have we read/written since we started the process? */
- static uint64_t stats_n_bytes_read = 0;
- static uint64_t stats_n_bytes_written = 0;
- /** What time did this process start up? */
- long time_of_process_start = 0;
- /** How many seconds have we been running? */
- long stats_n_seconds_working = 0;
- /** When do we next download a directory? */
- static time_t time_to_fetch_directory = 0;
- /** When do we next download a running-routers summary? */
- static time_t time_to_fetch_running_routers = 0;
- /** Array of all open connections; each element corresponds to the element of
- * poll_array in the same position. The first nfds elements are valid. */
- static connection_t *connection_array[MAXCONNECTIONS+1] =
- { NULL };
- static smartlist_t *closeable_connection_lst = NULL;
- static int nfds=0; /**< Number of connections currently active. */
- /** We set this to 1 when we've opened a circuit, so we can print a log
- * entry to inform the user that Tor is working. */
- int has_completed_circuit=0;
- #ifdef MS_WINDOWS
- #define MS_WINDOWS_SERVICE
- #endif
- #ifdef MS_WINDOWS_SERVICE
- #include <tchar.h>
- #define GENSRV_SERVICENAME TEXT("tor")
- #define GENSRV_DISPLAYNAME TEXT("Tor Win32 Service")
- #define GENSRV_DESCRIPTION \
- TEXT("Provides an anonymous Internet communication system")
- // Cheating: using the pre-defined error codes, tricks Windows into displaying
- // a semi-related human-readable error message if startup fails as
- // opposed to simply scaring people with Error: 0xffffffff
- #define NT_SERVICE_ERROR_NO_TORRC ERROR_FILE_NOT_FOUND
- #define NT_SERVICE_ERROR_TORINIT_FAILED ERROR_EXCEPTION_IN_SERVICE
- SERVICE_STATUS service_status;
- SERVICE_STATUS_HANDLE hStatus;
- static char **backup_argv;
- static int backup_argc;
- static int nt_service_is_stopped(void);
- static char* nt_strerror(uint32_t errnum);
- #else
- #define nt_service_is_stopped() (0)
- #endif
- #define FORCE_REGENERATE_DESCRIPTOR_INTERVAL 18*60*60 /* 18 hours */
- #define CHECK_DESCRIPTOR_INTERVAL 60 /* one minute */
- #define CHECK_IPADDRESS_INTERVAL (15*60) /* 15 minutes */
- #define BUF_SHRINK_INTERVAL 60 /* one minute */
- #define DESCRIPTOR_RETRY_INTERVAL 10
- #define DESCRIPTOR_FAILURE_RESET_INTERVAL 60*60
- #define ENTROPY_INTERVAL 60*60
- /********* END VARIABLES ************/
- /****************************************************************************
- *
- * This section contains accessors and other methods on the connection_array
- * and poll_array variables (which are global within this file and unavailable
- * outside it).
- *
- ****************************************************************************/
- /** Add <b>conn</b> to the array of connections that we can poll on. The
- * connection's socket must be set; the connection starts out
- * non-reading and non-writing.
- */
- int
- connection_add(connection_t *conn)
- {
- tor_assert(conn);
- tor_assert(conn->s >= 0);
- if (nfds >= get_options()->_ConnLimit-1) {
- warn(LD_NET,"Failing because we have %d connections already. Please "
- "raise your ulimit -n.", nfds);
- return -1;
- }
- tor_assert(conn->poll_index == -1); /* can only connection_add once */
- conn->poll_index = nfds;
- connection_array[nfds] = conn;
- conn->read_event = tor_malloc_zero(sizeof(struct event));
- conn->write_event = tor_malloc_zero(sizeof(struct event));
- event_set(conn->read_event, conn->s, EV_READ|EV_PERSIST,
- conn_read_callback, conn);
- event_set(conn->write_event, conn->s, EV_WRITE|EV_PERSIST,
- conn_write_callback, conn);
- nfds++;
- debug(LD_NET,"new conn type %s, socket %d, nfds %d.",
- conn_type_to_string(conn->type), conn->s, nfds);
- return 0;
- }
- /** Remove the connection from the global list, and remove the
- * corresponding poll entry. Calling this function will shift the last
- * connection (if any) into the position occupied by conn.
- */
- int
- connection_remove(connection_t *conn)
- {
- int current_index;
- tor_assert(conn);
- tor_assert(nfds>0);
- debug(LD_NET,"removing socket %d (type %s), nfds now %d",
- conn->s, conn_type_to_string(conn->type), nfds-1);
- tor_assert(conn->poll_index >= 0);
- current_index = conn->poll_index;
- if (current_index == nfds-1) { /* this is the end */
- nfds--;
- return 0;
- }
- connection_unregister(conn);
- /* replace this one with the one at the end */
- nfds--;
- connection_array[current_index] = connection_array[nfds];
- connection_array[current_index]->poll_index = current_index;
- return 0;
- }
- /** If it's an edge conn, remove it from the list
- * of conn's on this circuit. If it's not on an edge,
- * flush and send destroys for all circuits on this conn.
- *
- * If <b>remove</b> is non-zero, then remove it from the
- * connection_array and closeable_connection_lst.
- *
- * Then free it.
- */
- static void
- connection_unlink(connection_t *conn, int remove)
- {
- circuit_about_to_close_connection(conn);
- connection_about_to_close_connection(conn);
- if (remove) {
- connection_remove(conn);
- }
- smartlist_remove(closeable_connection_lst, conn);
- if (conn->type == CONN_TYPE_EXIT) {
- assert_connection_edge_not_dns_pending(conn);
- }
- if (conn->type == CONN_TYPE_OR &&
- !tor_digest_is_zero(conn->identity_digest)) {
- connection_or_remove_from_identity_map(conn);
- }
- connection_free(conn);
- }
- /** Schedule <b>conn</b> to be closed. **/
- void
- add_connection_to_closeable_list(connection_t *conn)
- {
- tor_assert(!smartlist_isin(closeable_connection_lst, conn));
- tor_assert(conn->marked_for_close);
- assert_connection_ok(conn, time(NULL));
- smartlist_add(closeable_connection_lst, conn);
- }
- /** Return 1 if conn is on the closeable list, else return 0. */
- int
- connection_is_on_closeable_list(connection_t *conn)
- {
- return smartlist_isin(closeable_connection_lst, conn);
- }
- /** Return true iff conn is in the current poll array. */
- int
- connection_in_array(connection_t *conn)
- {
- int i;
- for (i=0; i<nfds; ++i) {
- if (conn==connection_array[i])
- return 1;
- }
- return 0;
- }
- /** Set <b>*array</b> to an array of all connections, and <b>*n</b>
- * to the length of the array. <b>*array</b> and <b>*n</b> must not
- * be modified.
- */
- void
- get_connection_array(connection_t ***array, int *n)
- {
- *array = connection_array;
- *n = nfds;
- }
- /** Set the event mask on <b>conn</b> to <b>events</b>. (The event
- * mask is a bitmask whose bits are EV_READ and EV_WRITE.)
- */
- void
- connection_watch_events(connection_t *conn, short events)
- {
- int r;
- tor_assert(conn);
- tor_assert(conn->read_event);
- tor_assert(conn->write_event);
- if (events & EV_READ) {
- r = event_add(conn->read_event, NULL);
- } else {
- r = event_del(conn->read_event);
- }
- if (r<0)
- warn(LD_NET,
- "Error from libevent setting read event state for %d to "
- "%swatched: %s",
- conn->s, (events & EV_READ)?"":"un",
- tor_socket_strerror(tor_socket_errno(conn->s)));
- if (events & EV_WRITE) {
- r = event_add(conn->write_event, NULL);
- } else {
- r = event_del(conn->write_event);
- }
- if (r<0)
- warn(LD_NET,
- "Error from libevent setting read event state for %d to "
- "%swatched: %s",
- conn->s, (events & EV_WRITE)?"":"un",
- tor_socket_strerror(tor_socket_errno(conn->s)));
- }
- /** Return true iff <b>conn</b> is listening for read events. */
- int
- connection_is_reading(connection_t *conn)
- {
- tor_assert(conn);
- return conn->read_event && event_pending(conn->read_event, EV_READ, NULL);
- }
- /** Tell the main loop to stop notifying <b>conn</b> of any read events. */
- void
- connection_stop_reading(connection_t *conn)
- {
- tor_assert(conn);
- tor_assert(conn->read_event);
- debug(LD_NET,"connection_stop_reading() called.");
- if (event_del(conn->read_event))
- warn(LD_NET, "Error from libevent setting read event state for %d "
- "to unwatched.",
- conn->s);
- }
- /** Tell the main loop to start notifying <b>conn</b> of any read events. */
- void
- connection_start_reading(connection_t *conn)
- {
- tor_assert(conn);
- tor_assert(conn->read_event);
- if (event_add(conn->read_event, NULL))
- warn(LD_NET, "Error from libevent setting read event state for %d "
- "to watched.",
- conn->s);
- }
- /** Return true iff <b>conn</b> is listening for write events. */
- int
- connection_is_writing(connection_t *conn)
- {
- tor_assert(conn);
- return conn->write_event && event_pending(conn->write_event, EV_WRITE, NULL);
- }
- /** Tell the main loop to stop notifying <b>conn</b> of any write events. */
- void
- connection_stop_writing(connection_t *conn)
- {
- tor_assert(conn);
- tor_assert(conn->write_event);
- if (event_del(conn->write_event))
- warn(LD_NET, "Error from libevent setting write event state for %d "
- "to unwatched.",
- conn->s);
- }
- /** Tell the main loop to start notifying <b>conn</b> of any write events. */
- void
- connection_start_writing(connection_t *conn)
- {
- tor_assert(conn);
- tor_assert(conn->write_event);
- if (event_add(conn->write_event, NULL))
- warn(LD_NET, "Error from libevent setting write event state for %d "
- "to watched.",
- conn->s);
- }
- /** Close all connections that have been scheduled to get closed */
- static void
- close_closeable_connections(void)
- {
- int i;
- for (i = 0; i < smartlist_len(closeable_connection_lst); ) {
- connection_t *conn = smartlist_get(closeable_connection_lst, i);
- if (conn->poll_index < 0) {
- connection_unlink(conn, 0); /* blow it away right now */
- } else {
- if (!conn_close_if_marked(conn->poll_index))
- ++i;
- }
- }
- }
- /** Libevent callback: this gets invoked when (connection_t*)<b>conn</b> has
- * some data to read. */
- static void
- conn_read_callback(int fd, short event, void *_conn)
- {
- connection_t *conn = _conn;
- debug(LD_NET,"socket %d wants to read.",conn->s);
- assert_connection_ok(conn, time(NULL));
- if (connection_handle_read(conn) < 0) {
- if (!conn->marked_for_close) {
- #ifndef MS_WINDOWS
- warn(LD_BUG,"Bug: unhandled error on read for %s connection "
- "(fd %d); removing",
- conn_type_to_string(conn->type), conn->s);
- tor_fragile_assert();
- #endif
- if (CONN_IS_EDGE(conn))
- connection_edge_end_errno(conn, conn->cpath_layer);
- connection_mark_for_close(conn);
- }
- }
- assert_connection_ok(conn, time(NULL));
- if (smartlist_len(closeable_connection_lst))
- close_closeable_connections();
- }
- /** Libevent callback: this gets invoked when (connection_t*)<b>conn</b> has
- * some data to write. */
- static void
- conn_write_callback(int fd, short events, void *_conn)
- {
- connection_t *conn = _conn;
- LOG_FN_CONN(conn, (LOG_DEBUG, LD_NET, "socket %d wants to write.",conn->s));
- assert_connection_ok(conn, time(NULL));
- if (connection_handle_write(conn) < 0) {
- if (!conn->marked_for_close) {
- /* this connection is broken. remove it. */
- log_fn(LOG_WARN,LD_BUG,
- "Bug: unhandled error on write for %s connection (fd %d); removing",
- conn_type_to_string(conn->type), conn->s);
- tor_fragile_assert();
- conn->has_sent_end = 1; /* otherwise we cry wolf about duplicate close */
- /* XXX do we need a close-immediate here, so we don't try to flush? */
- connection_mark_for_close(conn);
- }
- }
- assert_connection_ok(conn, time(NULL));
- if (smartlist_len(closeable_connection_lst))
- close_closeable_connections();
- }
- /** If the connection at connection_array[i] is marked for close, then:
- * - If it has data that it wants to flush, try to flush it.
- * - If it _still_ has data to flush, and conn->hold_open_until_flushed is
- * true, then leave the connection open and return.
- * - Otherwise, remove the connection from connection_array and from
- * all other lists, close it, and free it.
- * Returns 1 if the connection was closed, 0 otherwise.
- */
- static int
- conn_close_if_marked(int i)
- {
- connection_t *conn;
- int retval;
- conn = connection_array[i];
- if (!conn->marked_for_close)
- return 0; /* nothing to see here, move along */
- assert_connection_ok(conn, time(NULL));
- assert_all_pending_dns_resolves_ok();
- debug(LD_NET,"Cleaning up connection (fd %d).",conn->s);
- if (conn->s >= 0 && connection_wants_to_flush(conn)) {
- /* s == -1 means it's an incomplete edge connection, or that the socket
- * has already been closed as unflushable. */
- int sz = connection_bucket_write_limit(conn);
- if (!conn->hold_open_until_flushed)
- info(LD_NET,
- "Conn (addr %s, fd %d, type %s, state %d) marked, but wants "
- "to flush %d bytes. (Marked at %s:%d)",
- conn->address, conn->s, conn_type_to_string(conn->type),
- conn->state,
- (int)conn->outbuf_flushlen,
- conn->marked_for_close_file, conn->marked_for_close);
- if (connection_speaks_cells(conn)) {
- if (conn->state == OR_CONN_STATE_OPEN) {
- retval = flush_buf_tls(conn->tls, conn->outbuf, sz,
- &conn->outbuf_flushlen);
- } else
- retval = -1; /* never flush non-open broken tls connections */
- } else {
- retval = flush_buf(conn->s, conn->outbuf, sz, &conn->outbuf_flushlen);
- }
- if (retval >= 0 && /* Technically, we could survive things like
- TLS_WANT_WRITE here. But don't bother for now. */
- conn->hold_open_until_flushed && connection_wants_to_flush(conn)) {
- LOG_FN_CONN(conn, (LOG_INFO,LD_NET,
- "Holding conn (fd %d) open for more flushing.",
- conn->s));
- /* XXX should we reset timestamp_lastwritten here? */
- return 0;
- }
- if (connection_wants_to_flush(conn)) {
- int severity;
- if (conn->type == CONN_TYPE_EXIT ||
- (conn->type == CONN_TYPE_OR && server_mode(get_options())) ||
- (conn->type == CONN_TYPE_DIR && conn->purpose == DIR_PURPOSE_SERVER))
- severity = LOG_INFO;
- else
- severity = LOG_NOTICE;
- log_fn(severity, LD_NET, "Something wrong with your network connection? "
- "We tried to write %d bytes to addr %s (fd %d, type %s, state %d)"
- " but timed out. (Marked at %s:%d)",
- (int)buf_datalen(conn->outbuf),
- safe_str(conn->address), conn->s, conn_type_to_string(conn->type),
- conn->state,
- conn->marked_for_close_file,
- conn->marked_for_close);
- }
- }
- connection_unlink(conn, 1); /* unlink, remove, free */
- return 1;
- }
- /** We've just tried every dirserver we know about, and none of
- * them were reachable. Assume the network is down. Change state
- * so next time an application connection arrives we'll delay it
- * and try another directory fetch. Kill off all the circuit_wait
- * streams that are waiting now, since they will all timeout anyway.
- */
- void
- directory_all_unreachable(time_t now)
- {
- connection_t *conn;
- stats_n_seconds_working=0; /* reset it */
- while ((conn = connection_get_by_type_state(CONN_TYPE_AP,
- AP_CONN_STATE_CIRCUIT_WAIT))) {
- notice(LD_NET,
- "Is your network connection down? Failing connection to '%s:%d'.",
- safe_str(conn->socks_request->address), conn->socks_request->port);
- connection_mark_unattached_ap(conn, END_STREAM_REASON_NET_UNREACHABLE);
- }
- }
- /**
- * Return the interval to wait between directory downloads, in seconds.
- */
- static INLINE int
- get_dir_fetch_period(or_options_t *options)
- {
- if (options->DirFetchPeriod)
- /* Value from config file. */
- return options->DirFetchPeriod;
- else if (options->DirPort)
- /* Default for directory server */
- return 20*60;
- else
- /* Default for average user. */
- return 120*60;
- }
- /**
- * Return the interval to wait betweeen router status downloads, in seconds.
- */
- static INLINE int
- get_status_fetch_period(or_options_t *options)
- {
- if (options->StatusFetchPeriod)
- /* Value from config file. */
- return options->StatusFetchPeriod;
- else if (options->DirPort)
- /* Default for directory server */
- return 15*60;
- else
- /* Default for average user. */
- return 30*60;
- }
- /** This function is called whenever we successfully pull down some new
- * network statuses or server descriptors. */
- void
- directory_info_has_arrived(time_t now, int from_cache)
- {
- or_options_t *options = get_options();
- if (!router_have_minimum_dir_info()) {
- log(LOG_NOTICE, LD_DIR,
- "I learned some more directory information, but not enough to "
- "build a circuit.");
- update_router_descriptor_downloads(now);
- return;
- }
- if (server_mode(options) &&
- !we_are_hibernating()) { /* connect to the appropriate routers */
- if (!authdir_mode(options))
- router_retry_connections(0, 1);
- if (!from_cache && has_completed_circuit)
- consider_testing_reachability();
- }
- }
- /** Perform regular maintenance tasks for a single connection. This
- * function gets run once per second per connection by run_scheduled_events.
- */
- static void
- run_connection_housekeeping(int i, time_t now)
- {
- cell_t cell;
- connection_t *conn = connection_array[i];
- or_options_t *options = get_options();
- if (conn->outbuf && !buf_datalen(conn->outbuf))
- conn->timestamp_lastempty = now;
- if (conn->marked_for_close) {
- /* nothing to do here */
- return;
- }
- /* Expire any directory connections that haven't sent anything for 5 min */
- if (conn->type == CONN_TYPE_DIR &&
- conn->timestamp_lastwritten + 5*60 < now) {
- info(LD_DIR,"Expiring wedged directory conn (fd %d, purpose %d)",
- conn->s, conn->purpose);
- /* This check is temporary; it's to let us know whether we should consider
- * parsing partial serverdesc responses. */
- if (conn->purpose == DIR_PURPOSE_FETCH_SERVERDESC &&
- buf_datalen(conn->inbuf)>=1024) {
- info(LD_DIR,"Trying to extract information from wedged server desc "
- "download.");
- connection_dir_reached_eof(conn);
- } else {
- connection_mark_for_close(conn);
- }
- return;
- }
- if (!connection_speaks_cells(conn))
- return; /* we're all done here, the rest is just for OR conns */
- #define TIME_BEFORE_OR_CONN_IS_OBSOLETE (60*60*24*7) /* a week */
- if (!conn->is_obsolete) {
- if (conn->timestamp_created + TIME_BEFORE_OR_CONN_IS_OBSOLETE < now) {
- info(LD_OR, "Marking OR conn to %s:%d obsolete (fd %d, %d secs old).",
- conn->address, conn->port, conn->s,
- (int)(now - conn->timestamp_created));
- conn->is_obsolete = 1;
- } else {
- connection_t *best =
- connection_or_get_by_identity_digest(conn->identity_digest);
- if (best && best != conn) {
- info(LD_OR,
- "Marking duplicate conn to %s:%d obsolete (fd %d, %d secs old).",
- conn->address, conn->port, conn->s,
- (int)(now - conn->timestamp_created));
- conn->is_obsolete = 1;
- }
- }
- }
- if (conn->is_obsolete && conn->n_circuits == 0) {
- /* no unmarked circs -- mark it now */
- info(LD_OR,"Expiring non-used OR connection to fd %d (%s:%d) [Obsolete].",
- conn->s,conn->address, conn->port);
- connection_mark_for_close(conn);
- conn->hold_open_until_flushed = 1;
- return;
- }
- /* If we haven't written to an OR connection for a while, then either nuke
- the connection or send a keepalive, depending. */
- if (now >= conn->timestamp_lastwritten + options->KeepalivePeriod) {
- routerinfo_t *router = router_get_by_digest(conn->identity_digest);
- if (!connection_state_is_open(conn)) {
- info(LD_OR,"Expiring non-open OR connection to fd %d (%s:%d).",
- conn->s,conn->address, conn->port);
- connection_mark_for_close(conn);
- conn->hold_open_until_flushed = 1;
- } else if (we_are_hibernating() && conn->n_circuits == 0 &&
- !buf_datalen(conn->outbuf)) {
- info(LD_OR,"Expiring non-used OR connection to fd %d (%s:%d) "
- "[Hibernating or exiting].",
- conn->s,conn->address, conn->port);
- connection_mark_for_close(conn);
- conn->hold_open_until_flushed = 1;
- } else if (!clique_mode(options) && conn->n_circuits &&
- (!router || !server_mode(options) ||
- !router_is_clique_mode(router))) {
- info(LD_OR,"Expiring non-used OR connection to fd %d (%s:%d) "
- "[Not in clique mode].",
- conn->s,conn->address, conn->port);
- connection_mark_for_close(conn);
- conn->hold_open_until_flushed = 1;
- } else if (
- now >= conn->timestamp_lastempty + options->KeepalivePeriod*10 &&
- now >= conn->timestamp_lastwritten + options->KeepalivePeriod*10) {
- log_fn(LOG_PROTOCOL_WARN,LD_PROTOCOL,
- "Expiring stuck OR connection to fd %d (%s:%d). (%d bytes to "
- "flush; %d seconds since last write)",
- conn->s, conn->address, conn->port,
- (int)buf_datalen(conn->outbuf),
- (int)(now-conn->timestamp_lastwritten));
- connection_mark_for_close(conn);
- } else if (!buf_datalen(conn->outbuf)) {
- /* either in clique mode, or we've got a circuit. send a padding cell. */
- log_fn(LOG_DEBUG,LD_OR,"Sending keepalive to (%s:%d)",
- conn->address, conn->port);
- memset(&cell,0,sizeof(cell_t));
- cell.command = CELL_PADDING;
- connection_or_write_cell_to_buf(&cell, conn);
- }
- }
- }
- /** Perform regular maintenance tasks. This function gets run once per
- * second by prepare_for_poll.
- */
- static void
- run_scheduled_events(time_t now)
- {
- static time_t last_rotated_certificate = 0;
- static time_t time_to_check_listeners = 0;
- static time_t time_to_check_descriptor = 0;
- static time_t time_to_check_ipaddress = 0;
- static time_t time_to_shrink_buffers = 0;
- static time_t time_to_try_getting_descriptors = 0;
- static time_t time_to_reset_descriptor_failures = 0;
- static time_t time_to_add_entropy = 0;
- or_options_t *options = get_options();
- int i;
- int have_dir_info;
- /** 0. See if we've been asked to shut down and our timeout has
- * expired; or if our bandwidth limits are exhausted and we
- * should hibernate; or if it's time to wake up from hibernation.
- */
- consider_hibernation(now);
- /** 1a. Every MIN_ONION_KEY_LIFETIME seconds, rotate the onion keys,
- * shut down and restart all cpuworkers, and update the directory if
- * necessary.
- */
- if (server_mode(options) &&
- get_onion_key_set_at()+MIN_ONION_KEY_LIFETIME < now) {
- info(LD_GENERAL,"Rotating onion key.");
- rotate_onion_key();
- cpuworkers_rotate();
- if (router_rebuild_descriptor(1)<0) {
- warn(LD_BUG, "Couldn't rebuild router descriptor");
- }
- if (advertised_server_mode())
- router_upload_dir_desc_to_dirservers(0);
- }
- if (time_to_try_getting_descriptors < now) {
- update_router_descriptor_downloads(now);
- time_to_try_getting_descriptors = now + DESCRIPTOR_RETRY_INTERVAL;
- }
- if (time_to_reset_descriptor_failures < now) {
- router_reset_descriptor_download_failures();
- time_to_reset_descriptor_failures =
- now + DESCRIPTOR_FAILURE_RESET_INTERVAL;
- }
- /** 1b. Every MAX_SSL_KEY_LIFETIME seconds, we change our TLS context. */
- if (!last_rotated_certificate)
- last_rotated_certificate = now;
- if (last_rotated_certificate+MAX_SSL_KEY_LIFETIME < now) {
- info(LD_GENERAL,"Rotating tls context.");
- if (tor_tls_context_new(get_identity_key(), 1, options->Nickname,
- MAX_SSL_KEY_LIFETIME) < 0) {
- warn(LD_BUG, "Error reinitializing TLS context");
- /* XXX is it a bug here, that we just keep going? */
- }
- last_rotated_certificate = now;
- /* XXXX We should rotate TLS connections as well; this code doesn't change
- * them at all. */
- }
- if (time_to_add_entropy == 0)
- time_to_add_entropy = now + ENTROPY_INTERVAL;
- if (time_to_add_entropy < now) {
- /* We already seeded once, so don't die on failure. */
- crypto_seed_rng();
- time_to_add_entropy = now + ENTROPY_INTERVAL;
- }
- /** 1c. If we have to change the accounting interval or record
- * bandwidth used in this accounting interval, do so. */
- if (accounting_is_enabled(options))
- accounting_run_housekeeping(now);
- if (now % 10 == 0 && authdir_mode(options) && !we_are_hibernating()) {
- /* try to determine reachability */
- router_retry_connections(1, 0);
- }
- /** 2. Periodically, we consider getting a new directory, getting a
- * new running-routers list, and/or force-uploading our descriptor
- * (if we've passed our internal checks). */
- if (time_to_fetch_directory < now) {
- /* purge obsolete entries */
- routerlist_remove_old_routers();
- networkstatus_list_clean(now);
- /* Only caches actually need to fetch directories now. */
- if (options->DirPort && !options->V1AuthoritativeDir) {
- /* XXX actually, we should only do this if we want to advertise
- * our dirport. not simply if we configured one. -RD */
- directory_get_from_dirserver(DIR_PURPOSE_FETCH_DIR, NULL, 1);
- }
- time_to_fetch_directory = now + get_dir_fetch_period(options);
- /* Also, take this chance to remove old information from rephist
- * and the rend cache. */
- rep_history_clean(now - options->RephistTrackTime);
- rend_cache_clean();
- /* And while we are at it, save the state with bandwidth history
- * and more. */
- or_state_save();
- }
- /* Caches need to fetch running_routers; directory clients don't. */
- if (options->DirPort && time_to_fetch_running_routers < now) {
- if (!authdir_mode(options) || !options->V1AuthoritativeDir) {
- directory_get_from_dirserver(DIR_PURPOSE_FETCH_RUNNING_LIST, NULL, 1);
- }
- time_to_fetch_running_routers = now + get_status_fetch_period(options);
- }
- /* 2b. Once per minute, regenerate and upload the descriptor if the old
- * one is inaccurate. */
- if (time_to_check_descriptor < now) {
- time_to_check_descriptor = now + CHECK_DESCRIPTOR_INTERVAL;
- check_descriptor_bandwidth_changed(now);
- if (time_to_check_ipaddress < now) {
- time_to_check_ipaddress = now + CHECK_IPADDRESS_INTERVAL;
- check_descriptor_ipaddress_changed(now);
- }
- mark_my_descriptor_dirty_if_older_than(
- now - FORCE_REGENERATE_DESCRIPTOR_INTERVAL);
- consider_publishable_server(now, 0);
- /* also, check religiously for reachability, if it's within the first
- * 20 minutes of our uptime. */
- if (server_mode(options) &&
- has_completed_circuit &&
- stats_n_seconds_working < TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT &&
- !we_are_hibernating())
- consider_testing_reachability();
- /* If any networkstatus documents are no longer recent, we need to
- * update all the descriptors' running status. */
- networkstatus_list_update_recent(now);
- routers_update_all_from_networkstatus();
- /* Also, once per minute, check whether we want to download any
- * networkstatus documents.
- */
- update_networkstatus_downloads(now);
- }
- /** 3a. Every second, we examine pending circuits and prune the
- * ones which have been pending for more than a few seconds.
- * We do this before step 4, so it can try building more if
- * it's not comfortable with the number of available circuits.
- */
- circuit_expire_building(now);
- /** 3b. Also look at pending streams and prune the ones that 'began'
- * a long time ago but haven't gotten a 'connected' yet.
- * Do this before step 4, so we can put them back into pending
- * state to be picked up by the new circuit.
- */
- connection_ap_expire_beginning();
- /** 3c. And expire connections that we've held open for too long.
- */
- connection_expire_held_open();
- /** 3d. And every 60 seconds, we relaunch listeners if any died. */
- if (!we_are_hibernating() && time_to_check_listeners < now) {
- /* 0 means "only launch the ones that died." */
- retry_all_listeners(0, NULL, NULL);
- time_to_check_listeners = now+60;
- }
- /** 4. Every second, we try a new circuit if there are no valid
- * circuits. Every NewCircuitPeriod seconds, we expire circuits
- * that became dirty more than MaxCircuitDirtiness seconds ago,
- * and we make a new circ if there are no clean circuits.
- */
- have_dir_info = router_have_minimum_dir_info();
- if (have_dir_info && !we_are_hibernating())
- circuit_build_needed_circs(now);
- /** 5. We do housekeeping for each connection... */
- for (i=0;i<nfds;i++) {
- run_connection_housekeeping(i, now);
- }
- if (time_to_shrink_buffers < now) {
- for (i=0;i<nfds;i++) {
- connection_t *conn = connection_array[i];
- if (conn->outbuf)
- buf_shrink(conn->outbuf);
- if (conn->inbuf)
- buf_shrink(conn->inbuf);
- }
- time_to_shrink_buffers = now + BUF_SHRINK_INTERVAL;
- }
- /** 6. And remove any marked circuits... */
- circuit_close_all_marked();
- /** 7. And upload service descriptors if necessary. */
- if (has_completed_circuit && !we_are_hibernating())
- rend_consider_services_upload(now);
- /** 8. and blow away any connections that need to die. have to do this now,
- * because if we marked a conn for close and left its socket -1, then
- * we'll pass it to poll/select and bad things will happen.
- */
- close_closeable_connections();
- }
- static struct event *timeout_event = NULL;
- static int n_libevent_errors = 0;
- /** Libevent callback: invoked once every second. */
- static void
- second_elapsed_callback(int fd, short event, void *args)
- {
- static struct timeval one_second;
- static long current_second = 0;
- struct timeval now;
- size_t bytes_written;
- size_t bytes_read;
- int seconds_elapsed;
- or_options_t *options = get_options();
- if (!timeout_event) {
- timeout_event = tor_malloc_zero(sizeof(struct event));
- evtimer_set(timeout_event, second_elapsed_callback, NULL);
- one_second.tv_sec = 1;
- one_second.tv_usec = 0;
- }
- n_libevent_errors = 0;
- /* log_fn(LOG_NOTICE, "Tick."); */
- tor_gettimeofday(&now);
- /* the second has rolled over. check more stuff. */
- bytes_written = stats_prev_global_write_bucket - global_write_bucket;
- bytes_read = stats_prev_global_read_bucket - global_read_bucket;
- /* XXX below we get suspicious if time jumps forward more than 10
- * seconds, but we never notice if it jumps *back* more than 10 seconds.
- * This could be useful for detecting that we just NTP'ed to three
- * weeks ago and it will be 3 weeks and 15 minutes until any of our
- * events trigger.
- */
- seconds_elapsed = current_second ? (now.tv_sec - current_second) : 0;
- stats_n_bytes_read += bytes_read;
- stats_n_bytes_written += bytes_written;
- if (accounting_is_enabled(options))
- accounting_add_bytes(bytes_read, bytes_written, seconds_elapsed);
- control_event_bandwidth_used((uint32_t)bytes_read,(uint32_t)bytes_written);
- connection_bucket_refill(&now);
- stats_prev_global_read_bucket = global_read_bucket;
- stats_prev_global_write_bucket = global_write_bucket;
- if (server_mode(options) &&
- !we_are_hibernating() &&
- stats_n_seconds_working / TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT !=
- (stats_n_seconds_working+seconds_elapsed) /
- TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT) {
- /* every 20 minutes, check and complain if necessary */
- routerinfo_t *me = router_get_my_routerinfo();
- if (me && !check_whether_orport_reachable())
- warn(LD_CONFIG,"Your server (%s:%d) has not managed to confirm that "
- "its ORPort is reachable. Please check your firewalls, ports, "
- "address, /etc/hosts file, etc.",
- me->address, me->or_port);
- if (me && !check_whether_dirport_reachable())
- warn(LD_CONFIG,"Your server (%s:%d) has not managed to confirm that its "
- "DirPort is reachable. Please check your firewalls, ports, "
- "address, /etc/hosts file, etc.",
- me->address, me->dir_port);
- }
- /* if more than 100s have elapsed, probably the clock jumped: doesn't
- * count. */
- if (seconds_elapsed < 100)
- stats_n_seconds_working += seconds_elapsed;
- else
- circuit_note_clock_jumped(seconds_elapsed);
- run_scheduled_events(now.tv_sec);
- current_second = now.tv_sec; /* remember which second it is, for next time */
- #if 0
- if (current_second % 300 == 0) {
- rep_history_clean(current_second - options->RephistTrackTime);
- dumpmemusage(get_min_log_level()<LOG_INFO ?
- get_min_log_level() : LOG_INFO);
- }
- #endif
- if (evtimer_add(timeout_event, &one_second))
- err(LD_NET,
- "Error from libevent when setting one-second timeout event");
- }
- /** Called when a possibly ignorable libevent error occurs; ensures that we
- * don't get into an infinite loop by ignoring too many errors from
- * libevent. */
- static int
- got_libevent_error(void)
- {
- if (++n_libevent_errors > 8) {
- err(LD_NET, "Too many libevent errors in one second; dying");
- return -1;
- }
- return 0;
- }
- /** Called when we get a SIGHUP: reload configuration files and keys,
- * retry all connections, re-upload all descriptors, and so on. */
- static int
- do_hup(void)
- {
- char keydir[512];
- or_options_t *options = get_options();
- notice(LD_GENERAL,"Received reload signal (hup). Reloading config.");
- has_completed_circuit=0;
- if (accounting_is_enabled(options))
- accounting_record_bandwidth_usage(time(NULL));
- router_reset_warnings();
- routerlist_reset_warnings();
- addressmap_clear_transient();
- /* first, reload config variables, in case they've changed */
- /* no need to provide argc/v, they've been cached inside init_from_config */
- if (options_init_from_torrc(0, NULL) < 0) {
- err(LD_CONFIG,"Reading config failed--see warnings above. "
- "For usage, try -h.");
- return -1;
- }
- options = get_options(); /* they have changed now */
- if (authdir_mode(options)) {
- /* reload the approved-routers file */
- tor_snprintf(keydir, sizeof(keydir),
- "%s/approved-routers", options->DataDirectory);
- info(LD_GENERAL,"Reloading approved fingerprints from \"%s\"...",keydir);
- if (dirserv_parse_fingerprint_file(keydir) < 0) {
- info(LD_GENERAL, "Error reloading fingerprints. "
- "Continuing with old list.");
- }
- }
- /* Rotate away from the old dirty circuits. This has to be done
- * after we've read the new options, but before we start using
- * circuits for directory fetches. */
- circuit_expire_all_dirty_circs();
- /* retry appropriate downloads */
- router_reset_status_download_failures();
- router_reset_descriptor_download_failures();
- update_networkstatus_downloads(time(NULL));
- /* We'll retry routerstatus downloads in about 10 seconds; no need to
- * force a retry there. */
- if (server_mode(options)) {
- const char *descriptor;
- /* Restart cpuworker and dnsworker processes, so they get up-to-date
- * configuration options. */
- cpuworkers_rotate();
- dnsworkers_rotate();
- /* Write out a fresh descriptor, but leave old one on failure. */
- router_rebuild_descriptor(1);
- descriptor = router_get_my_descriptor();
- if (descriptor) {
- tor_snprintf(keydir,sizeof(keydir),"%s/router.desc",
- options->DataDirectory);
- info(LD_OR,"Saving descriptor to \"%s\"...",keydir);
- if (write_str_to_file(keydir, descriptor, 0)) {
- return 0;
- }
- }
- }
- return 0;
- }
- /** Tor main loop. */
- static int
- do_main_loop(void)
- {
- int loop_result;
- dns_init(); /* initialize dns resolve map, spawn workers if needed */
- handle_signals(1);
- /* load the private keys, if we're supposed to have them, and set up the
- * TLS context. */
- if (! identity_key_is_set()) {
- if (init_keys() < 0) {
- err(LD_GENERAL,"Error initializing keys; exiting");
- return -1;
- }
- }
- /* Set up our buckets */
- connection_bucket_init();
- stats_prev_global_read_bucket = global_read_bucket;
- stats_prev_global_write_bucket = global_write_bucket;
- /* load the routers file, or assign the defaults. */
- if (router_reload_router_list()) {
- return -1;
- }
- /* load the networkstatuses. (This launches a download for new routers as
- * appropriate.)
- */
- if (router_reload_networkstatus()) {
- return -1;
- }
- directory_info_has_arrived(time(NULL),1);
- if (authdir_mode(get_options())) {
- /* the directory is already here, run startup things */
- router_retry_connections(1, 1);
- }
- if (server_mode(get_options())) {
- /* launch cpuworkers. Need to do this *after* we've read the onion key. */
- cpu_init();
- }
- /* set up once-a-second callback. */
- second_elapsed_callback(0,0,NULL);
- for (;;) {
- if (nt_service_is_stopped())
- return 0;
- #ifndef MS_WINDOWS
- /* Make it easier to tell whether libevent failure is our fault or not. */
- errno = 0;
- #endif
- /* poll until we have an event, or the second ends */
- loop_result = event_dispatch();
- /* let catch() handle things like ^c, and otherwise don't worry about it */
- if (loop_result < 0) {
- int e = tor_socket_errno(-1);
- /* let the program survive things like ^z */
- if (e != EINTR && !ERRNO_IS_EINPROGRESS(e)) {
- #ifdef HAVE_EVENT_GET_METHOD
- err(LD_NET,"libevent call with %s failed: %s [%d]",
- event_get_method(), tor_socket_strerror(e), e);
- #else
- err(LD_NET,"libevent call failed: %s [%d]",
- tor_socket_strerror(e), e);
- #endif
- return -1;
- #ifndef MS_WINDOWS
- } else if (e == EINVAL) {
- warn(LD_NET, "EINVAL from libevent: should you upgrade libevent?");
- if (got_libevent_error())
- return -1;
- #endif
- } else {
- if (ERRNO_IS_EINPROGRESS(e))
- warn(LD_BUG,"libevent call returned EINPROGRESS? Please report.");
- debug(LD_NET,"libevent call interrupted.");
- /* You can't trust the results of this poll(). Go back to the
- * top of the big for loop. */
- continue;
- }
- }
- /* refilling buckets and sending cells happens at the beginning of the
- * next iteration of the loop, inside prepare_for_poll()
- * XXXX No longer so.
- */
- }
- }
- /** Used to implement the SIGNAL control command: if we accept
- * <b>the_signal</b> as a remote pseudo-signal, then act on it and
- * return 0. Else return -1. */
- /* We don't re-use catch() here because:
- * 1. We handle a different set of signals than those allowed in catch.
- * 2. Platforms without signal() are unlikely to define SIGfoo.
- * 3. The control spec is defined to use fixed numeric signal values
- * which just happen to match the unix values.
- */
- int
- control_signal_act(int the_signal)
- {
- switch (the_signal)
- {
- case 1:
- signal_callback(0,0,(void*)(uintptr_t)SIGHUP);
- break;
- case 2:
- signal_callback(0,0,(void*)(uintptr_t)SIGINT);
- break;
- case 10:
- signal_callback(0,0,(void*)(uintptr_t)SIGUSR1);
- break;
- case 12:
- signal_callback(0,0,(void*)(uintptr_t)SIGUSR2);
- break;
- case 15:
- signal_callback(0,0,(void*)(uintptr_t)SIGTERM);
- break;
- default:
- return -1;
- }
- return 0;
- }
- /** Libevent callback: invoked when we get a signal.
- */
- static void
- signal_callback(int fd, short events, void *arg)
- {
- uintptr_t sig = (uintptr_t)arg;
- switch (sig)
- {
- case SIGTERM:
- err(LD_GENERAL,"Catching signal TERM, exiting cleanly.");
- tor_cleanup();
- exit(0);
- break;
- case SIGINT:
- if (!server_mode(get_options())) { /* do it now */
- notice(LD_GENERAL,"Interrupt: exiting cleanly.");
- tor_cleanup();
- exit(0);
- }
- hibernate_begin_shutdown();
- break;
- #ifdef SIGPIPE
- case SIGPIPE:
- debug(LD_GENERAL,"Caught sigpipe. Ignoring.");
- break;
- #endif
- case SIGUSR1:
- /* prefer to log it at INFO, but make sure we always see it */
- dumpstats(get_min_log_level()<LOG_INFO ? get_min_log_level() : LOG_INFO);
- break;
- case SIGUSR2:
- switch_logs_debug();
- debug(LD_GENERAL,"Caught USR2, going to loglevel debug. "
- "Send HUP to change back.");
- break;
- case SIGHUP:
- if (do_hup() < 0) {
- warn(LD_CONFIG,"Restart failed (config error?). Exiting.");
- tor_cleanup();
- exit(1);
- }
- break;
- #ifdef SIGCHLD
- case SIGCHLD:
- while (waitpid(-1,NULL,WNOHANG) > 0) ; /* keep reaping until no more
- zombies */
- break;
- #endif
- }
- }
- /**
- * Write current memory uusage information to the log.
- */
- static void
- dumpmemusage(int severity)
- {
- extern uint64_t buf_total_used;
- extern uint64_t buf_total_alloc;
- extern uint64_t rephist_total_alloc;
- extern uint32_t rephist_total_num;
- log(severity, LD_GENERAL,
- "In buffers: "U64_FORMAT" used/"U64_FORMAT" allocated (%d conns).",
- U64_PRINTF_ARG(buf_total_used), U64_PRINTF_ARG(buf_total_alloc),
- nfds);
- log(severity, LD_GENERAL, "In rephist: "U64_FORMAT" used by %d Tors.",
- U64_PRINTF_ARG(rephist_total_alloc), rephist_total_num);
- dump_routerlist_mem_usage(severity);
- }
- /** Write all statistics to the log, with log level 'severity'. Called
- * in response to a SIGUSR1. */
- static void
- dumpstats(int severity)
- {
- int i;
- connection_t *conn;
- time_t now = time(NULL);
- time_t elapsed;
- log(severity, LD_GENERAL, "Dumping stats:");
- for (i=0;i<nfds;i++) {
- conn = connection_array[i];
- log(severity, LD_GENERAL,
- "Conn %d (socket %d) type %d (%s), state %d (%s), created %d secs ago",
- i, conn->s, conn->type, conn_type_to_string(conn->type),
- conn->state, conn_state_to_string(conn->type, conn->state),
- (int)(now - conn->timestamp_created));
- if (!connection_is_listener(conn)) {
- log(severity,LD_GENERAL,
- "Conn %d is to '%s:%d'.",i,safe_str(conn->address), conn->port);
- log(severity,LD_GENERAL,
- "Conn %d: %d bytes waiting on inbuf (len %d, last read %d secs ago)",
- i,
- (int)buf_datalen(conn->inbuf),
- (int)buf_capacity(conn->inbuf),
- (int)(now - conn->timestamp_lastread));
- log(severity,LD_GENERAL,
- "Conn %d: %d bytes waiting on outbuf "
- "(len %d, last written %d secs ago)",i,
- (int)buf_datalen(conn->outbuf),
- (int)buf_capacity(conn->outbuf),
- (int)(now - conn->timestamp_lastwritten));
- }
- circuit_dump_by_conn(conn, severity); /* dump info about all the circuits
- * using this conn */
- }
- log(severity, LD_NET,
- "Cells processed: "U64_FORMAT" padding\n"
- " "U64_FORMAT" create\n"
- " "U64_FORMAT" created\n"
- " "U64_FORMAT" relay\n"
- " ("U64_FORMAT" relayed)\n"
- " ("U64_FORMAT" delivered)\n"
- " "U64_FORMAT" destroy",
- U64_PRINTF_ARG(stats_n_padding_cells_processed),
- U64_PRINTF_ARG(stats_n_create_cells_processed),
- U64_PRINTF_ARG(stats_n_created_cells_processed),
- U64_PRINTF_ARG(stats_n_relay_cells_processed),
- U64_PRINTF_ARG(stats_n_relay_cells_relayed),
- U64_PRINTF_ARG(stats_n_relay_cells_delivered),
- U64_PRINTF_ARG(stats_n_destroy_cells_processed));
- if (stats_n_data_cells_packaged)
- log(severity,LD_NET,"Average packaged cell fullness: %2.3f%%",
- 100*(((double)stats_n_data_bytes_packaged) /
- (stats_n_data_cells_packaged*RELAY_PAYLOAD_SIZE)) );
- if (stats_n_data_cells_received)
- log(severity,LD_NET,"Average delivered cell fullness: %2.3f%%",
- 100*(((double)stats_n_data_bytes_received) /
- (stats_n_data_cells_received*RELAY_PAYLOAD_SIZE)) );
- if (now - time_of_process_start >= 0)
- elapsed = now - time_of_process_start;
- else
- elapsed = 0;
- if (elapsed) {
- log(severity, LD_NET,
- "Average bandwidth: "U64_FORMAT"/%d = %d bytes/sec reading",
- U64_PRINTF_ARG(stats_n_bytes_read),
- (int)elapsed,
- (int) (stats_n_bytes_read/elapsed));
- log(severity, LD_NET,
- "Average bandwidth: "U64_FORMAT"/%d = %d bytes/sec writing",
- U64_PRINTF_ARG(stats_n_bytes_written),
- (int)elapsed,
- (int) (stats_n_bytes_written/elapsed));
- }
- log(severity, LD_NET, "--------------- Dumping memory information:");
- dumpmemusage(severity);
- rep_hist_dump_stats(now,severity);
- rend_service_dump_stats(severity);
- }
- /** Called by exit() as we shut down the process.
- */
- static void
- exit_function(void)
- {
- /* NOTE: If we ever daemonize, this gets called immediately. That's
- * okay for now, because we only use this on Windows. */
- #ifdef MS_WINDOWS
- WSACleanup();
- #endif
- }
- /** Set up the signal handlers for either parent or child. */
- void
- handle_signals(int is_parent)
- {
- #ifndef MS_WINDOWS /* do signal stuff only on unix */
- int i;
- static int signals[] = {
- SIGINT, /* do a controlled slow shutdown */
- SIGTERM, /* to terminate now */
- SIGPIPE, /* otherwise sigpipe kills us */
- SIGUSR1, /* dump stats */
- SIGUSR2, /* go to loglevel debug */
- SIGHUP, /* to reload config, retry conns, etc */
- #ifdef SIGXFSZ
- SIGXFSZ, /* handle file-too-big resource exhaustion */
- #endif
- SIGCHLD, /* handle dns/cpu workers that exit */
- -1 };
- static struct event signal_events[16]; /* bigger than it has to be. */
- if (is_parent) {
- for (i = 0; signals[i] >= 0; ++i) {
- signal_set(&signal_events[i], signals[i], signal_callback,
- (void*)(uintptr_t)signals[i]);
- if (signal_add(&signal_events[i], NULL))
- warn(LD_BUG, "Error from libevent when adding event for signal %d",
- signals[i]);
- }
- } else {
- struct sigaction action;
- action.sa_flags = 0;
- sigemptyset(&action.sa_mask);
- action.sa_handler = SIG_IGN;
- sigaction(SIGINT, &action, NULL);
- sigaction(SIGTERM, &action, NULL);
- sigaction(SIGPIPE, &action, NULL);
- sigaction(SIGUSR1, &action, NULL);
- sigaction(SIGUSR2, &action, NULL);
- sigaction(SIGHUP, &action, NULL);
- #ifdef SIGXFSZ
- sigaction(SIGXFSZ, &action, NULL);
- #endif
- }
- #endif /* signal stuff */
- }
- /** Main entry point for the Tor command-line client.
- */
- static int
- tor_init(int argc, char *argv[])
- {
- time_of_process_start = time(NULL);
- if (!closeable_connection_lst)
- closeable_connection_lst = smartlist_create();
- /* Initialize the history structures. */
- rep_hist_init();
- /* Initialize the service cache. */
- rend_cache_init();
- addressmap_init(); /* Init the client dns cache. Do it always, since it's
- * cheap. */
- /* give it somewhere to log to initially */
- add_temp_log();
- log(LOG_NOTICE, LD_GENERAL, "Tor v%s. This is experimental software. "
- "Do not rely on it for strong anonymity.",VERSION);
- if (network_init()<0) {
- err(LD_NET,"Error initializing network; exiting.");
- return -1;
- }
- atexit(exit_function);
- if (options_init_from_torrc(argc,argv) < 0) {
- err(LD_CONFIG,"Reading config failed--see warnings above. "
- "For usage, try -h.");
- return -1;
- }
- #ifndef MS_WINDOWS
- if (geteuid()==0)
- warn(LD_GENERAL,"You are running Tor as root. You don't need to, "
- "and you probably shouldn't.");
- #endif
- crypto_global_init(get_options()->HardwareAccel);
- if (crypto_seed_rng()) {
- err(LD_BUG, "Unable to seed random number generator. Exiting.");
- return -1;
- }
- return 0;
- }
- /** Free all memory that we might have allocated somewhere.
- * Helps us find the real leaks with dmalloc and the like.
- *
- * Also valgrind should then report 0 reachable in its
- * leak report */
- void
- tor_free_all(int postfork)
- {
- routerlist_free_all();
- addressmap_free_all();
- set_exit_redirects(NULL); /* free the registered exit redirects */
- free_socks_policy();
- free_dir_policy();
- dirserv_free_all();
- rend_service_free_all();
- rend_cache_free_all();
- rep_hist_free_all();
- dns_free_all();
- clear_pending_onions();
- circuit_free_all();
- entry_guards_free_all();
- connection_free_all();
- if (!postfork) {
- config_free_all();
- router_free_all();
- }
- tor_tls_free_all();
- /* stuff in main.c */
- smartlist_free(closeable_connection_lst);
- tor_free(timeout_event);
- if (!postfork) {
- close_logs(); /* free log strings. do this last so logs keep working. */
- }
- }
- /** Do whatever cleanup is necessary before shutting Tor down. */
- void
- tor_cleanup(void)
- {
- or_options_t *options = get_options();
- /* Remove our pid file. We don't care if there was an error when we
- * unlink, nothing we could do about it anyways. */
- if (options->PidFile && options->command == CMD_RUN_TOR)
- unlink(options->PidFile);
- if (accounting_is_enabled(options))
- accounting_record_bandwidth_usage(time(NULL));
- or_state_save();
- tor_free_all(0); /* move tor_free_all back into the ifdef below later. XXX*/
- crypto_global_cleanup();
- #ifdef USE_DMALLOC
- dmalloc_log_unfreed();
- dmalloc_shutdown();
- #endif
- }
- /** Read/create keys as needed, and echo our fingerprint to stdout. */
- static void
- do_list_fingerprint(void)
- {
- char buf[FINGERPRINT_LEN+1];
- crypto_pk_env_t *k;
- const char *nickname = get_options()->Nickname;
- if (!server_mode(get_options())) {
- printf("Clients don't have long-term identity keys. Exiting.\n");
- return;
- }
- tor_assert(nickname);
- if (init_keys() < 0) {
- err(LD_BUG,"Error initializing keys; exiting");
- return;
- }
- if (!(k = get_identity_key())) {
- err(LD_GENERAL,"Error: missing identity key.");
- return;
- }
- if (crypto_pk_get_fingerprint(k, buf, 1)<0) {
- warn(LD_BUG, "Error computing fingerprint");
- return;
- }
- printf("%s %s\n", nickname, buf);
- }
- /** Entry point for password hashing: take the desired password from
- * the command line, and print its salted hash to stdout. **/
- static void
- do_hash_password(void)
- {
- char output[256];
- char key[S2K_SPECIFIER_LEN+DIGEST_LEN];
- crypto_rand(key, S2K_SPECIFIER_LEN-1);
- key[S2K_SPECIFIER_LEN-1] = (uint8_t)96; /* Hash 64 K of data. */
- secret_to_key(key+S2K_SPECIFIER_LEN, DIGEST_LEN,
- get_options()->command_arg, strlen(get_options()->command_arg),
- key);
- base16_encode(output, sizeof(output), key, sizeof(key));
- printf("16:%s\n",output);
- }
- #ifdef MS_WINDOWS_SERVICE
- /** Checks if torrc is present in the same directory
- * as the service executable.
- * Return 1 if it is, 0 if it is not present. */
- static int
- nt_torrc_is_present()
- {
- HANDLE hFile;
- TCHAR szPath[_MAX_PATH];
- TCHAR szDrive[_MAX_DRIVE];
- TCHAR szDir[_MAX_DIR];
- char torrc[] = "torrc";
- char *path_to_torrc;
- int len = 0;
- /* Get the service executable path */
- if (0 == GetModuleFileName(NULL, szPath, MAX_PATH))
- return 0;
- _tsplitpath(szPath, szDrive, szDir, NULL, NULL);
- /* Build the path to the torrc file */
- len = _MAX_PATH + _MAX_DRIVE + _MAX_DIR + strlen(torrc) + 1;
- path_to_torrc = tor_malloc(len);
- if (tor_snprintf(path_to_torrc, len, "%s%s%s", szDrive, szDir, torrc)<0) {
- printf("Failed: tor_snprinf()\n");
- tor_free(path_to_torrc);
- return 0;
- }
- /* See if torrc is present */
- hFile = CreateFile(TEXT(path_to_torrc),
- GENERIC_READ, FILE_SHARE_READ, NULL,
- OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
- NULL);
- tor_free(path_to_torrc);
- if (hFile == INVALID_HANDLE_VALUE) {
- return 0;
- }
- CloseHandle(hFile);
- return 1;
- }
- /** If we're compile to run as an NT service, and the service has been
- * shut down, then change our current status and return 1. Else
- * return 0.
- */
- static int
- nt_service_is_stopped(void)
- {
- if (service_status.dwCurrentState == SERVICE_STOP_PENDING) {
- service_status.dwWin32ExitCode = 0;
- service_status.dwCurrentState = SERVICE_STOPPED;
- SetServiceStatus(hStatus, &service_status);
- return 1;
- } else if (service_status.dwCurrentState == SERVICE_STOPPED) {
- return 1;
- }
- return 0;
- }
- /** DOCDOC */
- void
- nt_service_control(DWORD request)
- {
- static struct timeval exit_now;
- exit_now.tv_sec = 0;
- exit_now.tv_usec = 0;
- switch (request) {
- case SERVICE_CONTROL_STOP:
- case SERVICE_CONTROL_SHUTDOWN:
- err(LD_GENERAL, "Got stop/shutdown request; shutting down cleanly.");
- service_status.dwCurrentState = SERVICE_STOP_PENDING;
- event_loopexit(&exit_now);
- return;
- }
- SetServiceStatus(hStatus, &service_status);
- }
- /** DOCDOC */
- void
- nt_service_body(int argc, char **argv)
- {
- int r;
- service_status.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
- service_status.dwCurrentState = SERVICE_START_PENDING;
- service_status.dwControlsAccepted =
- SERVICE_ACCEPT_STOP | SERVICE_ACCEPT_SHUTDOWN;
- service_status.dwWin32ExitCode = 0;
- service_status.dwServiceSpecificExitCode = 0;
- service_status.dwCheckPoint = 0;
- service_status.dwWaitHint = 1000;
- hStatus = RegisterServiceCtrlHandler(GENSRV_SERVICENAME,
- (LPHANDLER_FUNCTION) nt_service_control);
- if (hStatus == 0) {
- // failed;
- return;
- }
- // check for torrc
- if (nt_torrc_is_present()) {
- r = tor_init(backup_argc, backup_argv);
- // refactor this part out of tor_main and do_main_loop
- if (r) {
- r = NT_SERVICE_ERROR_TORINIT_FAILED;
- }
- }
- else {
- err(LD_CONFIG, "torrc is not in the current working directory. "
- "The Tor service will not start.");
- r = NT_SERVICE_ERROR_NO_TORRC;
- }
- if (r) {
- // failed.
- service_status.dwCurrentState = SERVICE_STOPPED;
- service_status.dwWin32ExitCode = r;
- service_status.dwServiceSpecificExitCode = r;
- SetServiceStatus(hStatus, &service_status);
- return;
- }
- service_status.dwCurrentState = SERVICE_RUNNING;
- SetServiceStatus(hStatus, &service_status);
- do_main_loop();
- tor_cleanup();
- return;
- }
- /** DOCDOC */
- void
- nt_service_main(void)
- {
- SERVICE_TABLE_ENTRY table[2];
- DWORD result = 0;
- char *errmsg;
- table[0].lpServiceName = GENSRV_SERVICENAME;
- table[0].lpServiceProc = (LPSERVICE_MAIN_FUNCTION)nt_service_body;
- table[1].lpServiceName = NULL;
- table[1].lpServiceProc = NULL;
- if (!StartServiceCtrlDispatcher(table)) {
- result = GetLastError();
- errmsg = nt_strerror(result);
- printf("Service error %d : %s\n", result, errmsg);
- LocalFree(errmsg);
- if (result == ERROR_FAILED_SERVICE_CONTROLLER_CONNECT) {
- if (tor_init(backup_argc, backup_argv) < 0)
- return;
- switch (get_options()->command) {
- case CMD_RUN_TOR:
- do_main_loop();
- break;
- case CMD_LIST_FINGERPRINT:
- do_list_fingerprint();
- break;
- case CMD_HASH_PASSWORD:
- do_hash_password();
- break;
- case CMD_VERIFY_CONFIG:
- printf("Configuration was valid\n");
- break;
- default:
- err(LD_CONFIG, "Illegal command number %d: internal error.",
- get_options()->command);
- }
- tor_cleanup();
- }
- }
- }
- /** DOCDOC */
- SC_HANDLE
- nt_service_open_scm(void)
- {
- SC_HANDLE hSCManager;
- char *errmsg = NULL;
- if ((hSCManager = OpenSCManager(NULL, NULL, SC_MANAGER_CREATE_SERVICE))
- == NULL) {
- errmsg = nt_strerror(GetLastError());
- printf("OpenSCManager() failed : %s\n", errmsg);
- LocalFree(errmsg);
- }
- return hSCManager;
- }
- /** DOCDOC */
- SC_HANDLE
- nt_service_open(SC_HANDLE hSCManager)
- {
- SC_HANDLE hService;
- char *errmsg = NULL;
- if ((hService = OpenService(hSCManager, GENSRV_SERVICENAME,
- SERVICE_ALL_ACCESS)) == NULL) {
- errmsg = nt_strerror(GetLastError());
- printf("OpenService() failed : %s\n", errmsg);
- LocalFree(errmsg);
- }
- return hService;
- }
- /** DOCDOC */
- int
- nt_service_start(SC_HANDLE hService)
- {
- char *errmsg = NULL;
- QueryServiceStatus(hService, &service_status);
- if (service_status.dwCurrentState == SERVICE_RUNNING) {
- printf("Service is already running\n");
- return 1;
- }
- if (StartService(hService, 0, NULL)) {
- /* Loop until the service has finished attempting to start */
- while (QueryServiceStatus(hService, &service_status)) {
- if (service_status.dwCurrentState == SERVICE_START_PENDING)
- Sleep(500);
- else
- break;
- }
- /* Check if it started successfully or not */
- if (service_status.dwCurrentState == SERVICE_RUNNING) {
- printf("Service started successfully\n");
- return 1;
- }
- else {
- errmsg = nt_strerror(service_status.dwWin32ExitCode);
- printf("Service failed to start : %s\n", errmsg);
- LocalFree(errmsg);
- }
- }
- else {
- errmsg = nt_strerror(GetLastError());
- printf("StartService() failed : %s\n", errmsg);
- LocalFree(errmsg);
- }
- return 0;
- }
- /** DOCDOC */
- int
- nt_service_stop(SC_HANDLE hService)
- {
- char *errmsg = NULL;
- QueryServiceStatus(hService, &service_status);
- if (service_status.dwCurrentState == SERVICE_STOPPED) {
- printf("Service is already stopped\n");
- return 1;
- }
- if (ControlService(hService, SERVICE_CONTROL_STOP, &service_status)) {
- while (QueryServiceStatus(hService, &service_status)) {
- if (service_status.dwCurrentState == SERVICE_STOP_PENDING)
- Sleep(500);
- else
- break;
- }
- if (service_status.dwCurrentState == SERVICE_STOPPED) {
- printf("Service stopped successfully\n");
- return 1;
- }
- else {
- errmsg = nt_strerror(GetLastError());
- printf("Service failed to stop : %s\n");
- LocalFree(errmsg);
- }
- }
- else {
- errmsg = nt_strerror(GetLastError());
- printf("ControlService() failed : %s\n", errmsg);
- LocalFree(errmsg);
- }
- return 0;
- }
- /** DOCDOC */
- int
- nt_service_install(void)
- {
- /* XXXX Problems with NT services:
- * 1. The configuration file needs to be in the same directory as the .exe
- *
- * 2. The exe and the configuration file can't be on any directory path
- * that contains a space.
- * mje - you can quote the string (i.e., "c:\program files")
- *
- * 3. Ideally, there should be one EXE that can either run as a
- * separate process (as now) or that can install and run itself
- * as an NT service. I have no idea how hard this is.
- * mje - should be done. It can install and run itself as a service
- *
- * Notes about developing NT services:
- *
- * 1. Don't count on your CWD. If an absolute path is not given, the
- * fopen() function goes wrong.
- * 2. The parameters given to the nt_service_body() function differ
- * from those given to main() function.
- */
- SC_HANDLE hSCManager = NULL;
- SC_HANDLE hService = NULL;
- SERVICE_DESCRIPTION sdBuff;
- TCHAR szPath[_MAX_PATH];
- TCHAR szDrive[_MAX_DRIVE];
- TCHAR szDir[_MAX_DIR];
- char cmd1[] = " -f ";
- char cmd2[] = "\\torrc";
- char *command;
- char *errmsg;
- int len = 0;
- if (0 == GetModuleFileName(NULL, szPath, MAX_PATH))
- return 0;
- _tsplitpath(szPath, szDrive, szDir, NULL, NULL);
- /* Account for the extra quotes */
- //len = _MAX_PATH + strlen(cmd1) + _MAX_DRIVE + _MAX_DIR + strlen(cmd2);
- len = _MAX_PATH + strlen(cmd1) + _MAX_DRIVE + _MAX_DIR + strlen(cmd2) + 64;
- command = tor_malloc(len);
- /* Create a quoted command line, like "c:\with spaces\tor.exe" -f
- * "c:\with spaces\tor.exe"
- */
- if (tor_snprintf(command, len, "\"%s\" --nt-service -f \"%s%storrc\"",
- szPath, szDrive, szDir)<0) {
- printf("Failed: tor_snprinf()\n");
- tor_free(command);
- return 0;
- }
- if ((hSCManager = nt_service_open_scm()) == NULL) {
- tor_free(command);
- return 0;
- }
- /* 1/26/2005 mje
- * - changed the service start type to auto
- * - and changed the lpPassword param to "" instead of NULL as per an
- * MSDN article.
- */
- if ((hService = CreateService(hSCManager, GENSRV_SERVICENAME,
- GENSRV_DISPLAYNAME,
- SERVICE_ALL_ACCESS, SERVICE_WIN32_OWN_PROCESS,
- SERVICE_AUTO_START, SERVICE_ERROR_IGNORE,
- command,
- NULL, NULL, NULL, NULL, "")) == NULL) {
- errmsg = nt_strerror(GetLastError());
- printf("CreateService() failed : %s\n", errmsg);
- CloseServiceHandle(hSCManager);
- LocalFree(errmsg);
- tor_free(command);
- return 0;
- }
- /* Set the service's description */
- sdBuff.lpDescription = GENSRV_DESCRIPTION;
- ChangeServiceConfig2(hService, SERVICE_CONFIG_DESCRIPTION, &sdBuff);
- printf("Service installed successfully\n");
- /* Start the service initially */
- nt_service_start(hService);
- CloseServiceHandle(hService);
- CloseServiceHandle(hSCManager);
- tor_free(command);
- return 0;
- }
- /** DOCDOC */
- int
- nt_service_remove(void)
- {
- SC_HANDLE hSCManager = NULL;
- SC_HANDLE hService = NULL;
- BOOL result = FALSE;
- char *errmsg;
- if ((hSCManager = nt_service_open_scm()) == NULL) {
- return 0;
- }
- if ((hService = nt_service_open(hSCManager)) == NULL) {
- CloseServiceHandle(hSCManager);
- return 0;
- }
- if (nt_service_stop(hService)) {
- if (DeleteService(hService)) {
- printf("Removed service successfully\n");
- }
- else {
- errmsg = nt_strerror(GetLastError());
- printf("DeleteService() failed : %s\n", errmsg);
- LocalFree(errmsg);
- }
- }
- else {
- printf("Service could not be removed\n");
- }
- CloseServiceHandle(hService);
- CloseServiceHandle(hSCManager);
- return 0;
- }
- /** DOCDOC */
- int
- nt_service_cmd_start(void)
- {
- SC_HANDLE hSCManager;
- SC_HANDLE hService;
- int start;
- if ((hSCManager = nt_service_open_scm()) == NULL)
- return -1;
- if ((hService = nt_service_open(hSCManager)) == NULL) {
- CloseHandle(hSCManager);
- return -1;
- }
- start = nt_service_start(hService);
- CloseHandle(hService);
- CloseHandle(hSCManager);
- return start;
- }
- /** DOCDOC */
- int
- nt_service_cmd_stop(void)
- {
- SC_HANDLE hSCManager;
- SC_HANDLE hService;
- int stop;
- if ((hSCManager = nt_service_open_scm()) == NULL)
- return -1;
- if ((hService = nt_service_open(hSCManager)) == NULL) {
- CloseHandle(hSCManager);
- return -1;
- }
- stop = nt_service_stop(hService);
- CloseHandle(hService);
- CloseHandle(hSCManager);
- return stop;
- }
- /** Given a Win32 error code, this attempts to make Windows
- * return a human-readable error message. The char* returned
- * is allocated by Windows, but should be freed with LocalFree()
- * when finished with it. */
- static char*
- nt_strerror(uint32_t errnum)
- {
- char *msgbuf;
- FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
- NULL, errnum, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
- (LPSTR)&msgbuf, 0, NULL);
- return msgbuf;
- }
- #endif
- #ifdef USE_DMALLOC
- #include <openssl/crypto.h>
- static void
- _tor_dmalloc_free(void *p)
- {
- tor_free(p);
- }
- #endif
- /** DOCDOC */
- int
- tor_main(int argc, char *argv[])
- {
- #ifdef USE_DMALLOC
- int r = CRYPTO_set_mem_ex_functions(_tor_malloc, _tor_realloc,
- _tor_dmalloc_free);
- notice(LD_CONFIG, "Set up damalloc; returned %d", r);
- #endif
- #ifdef MS_WINDOWS_SERVICE
- backup_argv = argv;
- backup_argc = argc;
- if ((argc >= 3) &&
- (!strcmp(argv[1], "-service") || !strcmp(argv[1], "--service"))) {
- if (!strcmp(argv[2], "install"))
- return nt_service_install();
- if (!strcmp(argv[2], "remove"))
- return nt_service_remove();
- if (!strcmp(argv[2], "start"))
- return nt_service_cmd_start();
- if (!strcmp(argv[2], "stop"))
- return nt_service_cmd_stop();
- printf("Unrecognized service command '%s'\n", argv[2]);
- return -1;
- }
- // These are left so as not to confuse people who are used to these options
- if (argc >= 2) {
- if (!strcmp(argv[1], "-install") || !strcmp(argv[1], "--install"))
- return nt_service_install();
- if (!strcmp(argv[1], "-remove") || !strcmp(argv[1], "--remove"))
- return nt_service_remove();
- if (!strcmp(argv[1], "-nt-service") || !strcmp(argv[1], "--nt-service")) {
- nt_service_main();
- return 0;
- }
- }
- #endif
- if (tor_init(argc, argv)<0)
- return -1;
- switch (get_options()->command) {
- case CMD_RUN_TOR:
- #ifdef MS_WINDOWS_SERVICE
- service_status.dwCurrentState = SERVICE_RUNNING;
- #endif
- do_main_loop();
- break;
- case CMD_LIST_FINGERPRINT:
- do_list_fingerprint();
- break;
- case CMD_HASH_PASSWORD:
- do_hash_password();
- break;
- case CMD_VERIFY_CONFIG:
- printf("Configuration was valid\n");
- break;
- default:
- warn(LD_BUG,"Illegal command number %d: internal error.",
- get_options()->command);
- }
- tor_cleanup();
- return -1;
- }
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