1 /* Copyright (c) 2001 Matej Pfajfar.
2 * Copyright (c) 2001-2004, Roger Dingledine.
3 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
4 * Copyright (c) 2007-2008, The Tor Project, Inc. */
5 /* See LICENSE for licensing information */
7 const char main_c_id
[] =
12 * \brief Toplevel module. Handles signals, multiplexes between
13 * connections, implements main loop, and drives scheduled events.
20 #include <openssl/crypto.h>
24 void evdns_shutdown(int);
26 /********* PROTOTYPES **********/
28 static void dumpmemusage(int severity
);
29 static void dumpstats(int severity
); /* log stats */
30 static void conn_read_callback(int fd
, short event
, void *_conn
);
31 static void conn_write_callback(int fd
, short event
, void *_conn
);
32 static void signal_callback(int fd
, short events
, void *arg
);
33 static void second_elapsed_callback(int fd
, short event
, void *args
);
34 static int conn_close_if_marked(int i
);
35 static void connection_start_reading_from_linked_conn(connection_t
*conn
);
36 static int connection_should_read_from_linked_conn(connection_t
*conn
);
38 /********* START VARIABLES **********/
40 int global_read_bucket
; /**< Max number of bytes I can read this second. */
41 int global_write_bucket
; /**< Max number of bytes I can write this second. */
43 /** Max number of relayed (bandwidth class 1) bytes I can read this second. */
44 int global_relayed_read_bucket
;
45 /** Max number of relayed (bandwidth class 1) bytes I can write this second. */
46 int global_relayed_write_bucket
;
48 /** What was the read bucket before the last second_elapsed_callback() call?
49 * (used to determine how many bytes we've read). */
50 static int stats_prev_global_read_bucket
;
51 /** What was the write bucket before the last second_elapsed_callback() call?
52 * (used to determine how many bytes we've written). */
53 static int stats_prev_global_write_bucket
;
54 /* XXX we might want to keep stats about global_relayed_*_bucket too. Or not.*/
55 /** How many bytes have we read/written since we started the process? */
56 static uint64_t stats_n_bytes_read
= 0;
57 static uint64_t stats_n_bytes_written
= 0;
58 /** What time did this process start up? */
59 time_t time_of_process_start
= 0;
60 /** How many seconds have we been running? */
61 long stats_n_seconds_working
= 0;
62 /** When do we next launch DNS wildcarding checks? */
63 static time_t time_to_check_for_correct_dns
= 0;
65 /** How often will we honor SIGNEWNYM requests? */
66 #define MAX_SIGNEWNYM_RATE 10
67 /** When did we last process a SIGNEWNYM request? */
68 static time_t time_of_last_signewnym
= 0;
69 /** Is there a signewnym request we're currently waiting to handle? */
70 static int signewnym_is_pending
= 0;
72 /** Smartlist of all open connections. */
73 static smartlist_t
*connection_array
= NULL
;
74 /** List of connections that have been marked for close and need to be freed
75 * and removed from connection_array. */
76 static smartlist_t
*closeable_connection_lst
= NULL
;
77 /** List of linked connections that are currently reading data into their
78 * inbuf from their partner's outbuf. */
79 static smartlist_t
*active_linked_connection_lst
= NULL
;
80 /** Flag: Set to true iff we entered the current libevent main loop via
81 * <b>loop_once</b>. If so, there's no need to trigger a loopexit in order
82 * to handle linked connections. */
83 static int called_loop_once
= 0;
85 /** We set this to 1 when we've opened a circuit, so we can print a log
86 * entry to inform the user that Tor is working. */
87 int has_completed_circuit
=0;
89 /** How often do we check for router descriptors that we should download
90 * when we have too little directory info? */
91 #define GREEDY_DESCRIPTOR_RETRY_INTERVAL (10)
92 /** How often do we check for router descriptors that we should download
93 * when we have enough directory info? */
94 #define LAZY_DESCRIPTOR_RETRY_INTERVAL (60)
95 /** How often do we 'forgive' undownloadable router descriptors and attempt
96 * to download them again? */
97 #define DESCRIPTOR_FAILURE_RESET_INTERVAL (60*60)
98 /** How long do we let a directory connection stall before expiring it? */
99 #define DIR_CONN_MAX_STALL (5*60)
101 /** How old do we let a connection to an OR get before deciding it's
102 * too old for new circuits? */
103 #define TIME_BEFORE_OR_CONN_IS_TOO_OLD (60*60*24*7)
104 /** How long do we let OR connections handshake before we decide that
105 * they are obsolete? */
106 #define TLS_HANDSHAKE_TIMEOUT (60)
108 /********* END VARIABLES ************/
110 /****************************************************************************
112 * This section contains accessors and other methods on the connection_array
113 * variables (which are global within this file and unavailable outside it).
115 ****************************************************************************/
117 /** Add <b>conn</b> to the array of connections that we can poll on. The
118 * connection's socket must be set; the connection starts out
119 * non-reading and non-writing.
122 connection_add(connection_t
*conn
)
125 tor_assert(conn
->s
>= 0 ||
127 (conn
->type
== CONN_TYPE_AP
&&
128 TO_EDGE_CONN(conn
)->is_dns_request
));
130 tor_assert(conn
->conn_array_index
== -1); /* can only connection_add once */
131 conn
->conn_array_index
= smartlist_len(connection_array
);
132 smartlist_add(connection_array
, conn
);
134 if (conn
->s
>= 0 || conn
->linked
) {
135 conn
->read_event
= tor_malloc_zero(sizeof(struct event
));
136 conn
->write_event
= tor_malloc_zero(sizeof(struct event
));
137 event_set(conn
->read_event
, conn
->s
, EV_READ
|EV_PERSIST
,
138 conn_read_callback
, conn
);
139 event_set(conn
->write_event
, conn
->s
, EV_WRITE
|EV_PERSIST
,
140 conn_write_callback
, conn
);
143 log_debug(LD_NET
,"new conn type %s, socket %d, address %s, n_conns %d.",
144 conn_type_to_string(conn
->type
), conn
->s
, conn
->address
,
145 smartlist_len(connection_array
));
150 /** Remove the connection from the global list, and remove the
151 * corresponding poll entry. Calling this function will shift the last
152 * connection (if any) into the position occupied by conn.
155 connection_remove(connection_t
*conn
)
162 log_debug(LD_NET
,"removing socket %d (type %s), n_conns now %d",
163 conn
->s
, conn_type_to_string(conn
->type
),
164 smartlist_len(connection_array
));
166 tor_assert(conn
->conn_array_index
>= 0);
167 current_index
= conn
->conn_array_index
;
168 connection_unregister_events(conn
); /* This is redundant, but cheap. */
169 if (current_index
== smartlist_len(connection_array
)-1) { /* at the end */
170 smartlist_del(connection_array
, current_index
);
174 /* replace this one with the one at the end */
175 smartlist_del(connection_array
, current_index
);
176 tmp
= smartlist_get(connection_array
, current_index
);
177 tmp
->conn_array_index
= current_index
;
182 /** If <b>conn</b> is an edge conn, remove it from the list
183 * of conn's on this circuit. If it's not on an edge,
184 * flush and send destroys for all circuits on this conn.
186 * Remove it from connection_array (if applicable) and
187 * from closeable_connection_list.
192 connection_unlink(connection_t
*conn
)
194 connection_about_to_close_connection(conn
);
195 if (conn
->conn_array_index
>= 0) {
196 connection_remove(conn
);
198 if (conn
->linked_conn
) {
199 conn
->linked_conn
->linked_conn
= NULL
;
200 if (! conn
->linked_conn
->marked_for_close
&&
201 conn
->linked_conn
->reading_from_linked_conn
)
202 connection_start_reading(conn
->linked_conn
);
203 conn
->linked_conn
= NULL
;
205 smartlist_remove(closeable_connection_lst
, conn
);
206 smartlist_remove(active_linked_connection_lst
, conn
);
207 if (conn
->type
== CONN_TYPE_EXIT
) {
208 assert_connection_edge_not_dns_pending(TO_EDGE_CONN(conn
));
210 if (conn
->type
== CONN_TYPE_OR
) {
211 if (!tor_digest_is_zero(TO_OR_CONN(conn
)->identity_digest
))
212 connection_or_remove_from_identity_map(TO_OR_CONN(conn
));
214 connection_free(conn
);
217 /** Schedule <b>conn</b> to be closed. **/
219 add_connection_to_closeable_list(connection_t
*conn
)
221 tor_assert(!smartlist_isin(closeable_connection_lst
, conn
));
222 tor_assert(conn
->marked_for_close
);
223 assert_connection_ok(conn
, time(NULL
));
224 smartlist_add(closeable_connection_lst
, conn
);
227 /** Return 1 if conn is on the closeable list, else return 0. */
229 connection_is_on_closeable_list(connection_t
*conn
)
231 return smartlist_isin(closeable_connection_lst
, conn
);
234 /** Return true iff conn is in the current poll array. */
236 connection_in_array(connection_t
*conn
)
238 return smartlist_isin(connection_array
, conn
);
241 /** Set <b>*array</b> to an array of all connections, and <b>*n</b>
242 * to the length of the array. <b>*array</b> and <b>*n</b> must not
246 get_connection_array(void)
248 if (!connection_array
)
249 connection_array
= smartlist_create();
250 return connection_array
;
253 /** Set the event mask on <b>conn</b> to <b>events</b>. (The event
254 * mask is a bitmask whose bits are EV_READ and EV_WRITE.)
257 connection_watch_events(connection_t
*conn
, short events
)
259 if (events
& EV_READ
)
260 connection_start_reading(conn
);
262 connection_stop_reading(conn
);
264 if (events
& EV_WRITE
)
265 connection_start_writing(conn
);
267 connection_stop_writing(conn
);
270 /** Return true iff <b>conn</b> is listening for read events. */
272 connection_is_reading(connection_t
*conn
)
276 return conn
->reading_from_linked_conn
||
277 (conn
->read_event
&& event_pending(conn
->read_event
, EV_READ
, NULL
));
280 /** Tell the main loop to stop notifying <b>conn</b> of any read events. */
282 connection_stop_reading(connection_t
*conn
)
285 tor_assert(conn
->read_event
);
288 conn
->reading_from_linked_conn
= 0;
289 connection_stop_reading_from_linked_conn(conn
);
291 if (event_del(conn
->read_event
))
292 log_warn(LD_NET
, "Error from libevent setting read event state for %d "
295 tor_socket_strerror(tor_socket_errno(conn
->s
)));
299 /** Tell the main loop to start notifying <b>conn</b> of any read events. */
301 connection_start_reading(connection_t
*conn
)
304 tor_assert(conn
->read_event
);
307 conn
->reading_from_linked_conn
= 1;
308 if (connection_should_read_from_linked_conn(conn
))
309 connection_start_reading_from_linked_conn(conn
);
311 if (event_add(conn
->read_event
, NULL
))
312 log_warn(LD_NET
, "Error from libevent setting read event state for %d "
315 tor_socket_strerror(tor_socket_errno(conn
->s
)));
319 /** Return true iff <b>conn</b> is listening for write events. */
321 connection_is_writing(connection_t
*conn
)
325 return conn
->writing_to_linked_conn
||
326 (conn
->write_event
&& event_pending(conn
->write_event
, EV_WRITE
, NULL
));
329 /** Tell the main loop to stop notifying <b>conn</b> of any write events. */
331 connection_stop_writing(connection_t
*conn
)
334 tor_assert(conn
->write_event
);
337 conn
->writing_to_linked_conn
= 0;
338 if (conn
->linked_conn
)
339 connection_stop_reading_from_linked_conn(conn
->linked_conn
);
341 if (event_del(conn
->write_event
))
342 log_warn(LD_NET
, "Error from libevent setting write event state for %d "
345 tor_socket_strerror(tor_socket_errno(conn
->s
)));
349 /** Tell the main loop to start notifying <b>conn</b> of any write events. */
351 connection_start_writing(connection_t
*conn
)
354 tor_assert(conn
->write_event
);
357 conn
->writing_to_linked_conn
= 1;
358 if (conn
->linked_conn
&&
359 connection_should_read_from_linked_conn(conn
->linked_conn
))
360 connection_start_reading_from_linked_conn(conn
->linked_conn
);
362 if (event_add(conn
->write_event
, NULL
))
363 log_warn(LD_NET
, "Error from libevent setting write event state for %d "
366 tor_socket_strerror(tor_socket_errno(conn
->s
)));
370 /** Return true iff <b>conn</b> is linked conn, and reading from the conn
371 * linked to it would be good and feasible. (Reading is "feasible" if the
372 * other conn exists and has data in its outbuf, and is "good" if we have our
373 * reading_from_linked_conn flag set and the other conn has its
374 * writing_to_linked_conn flag set.)*/
376 connection_should_read_from_linked_conn(connection_t
*conn
)
378 if (conn
->linked
&& conn
->reading_from_linked_conn
) {
379 if (! conn
->linked_conn
||
380 (conn
->linked_conn
->writing_to_linked_conn
&&
381 buf_datalen(conn
->linked_conn
->outbuf
)))
387 /** Helper: Tell the main loop to begin reading bytes into <b>conn</b> from
388 * its linked connection, if it is not doing so already. Called by
389 * connection_start_reading and connection_start_writing as appropriate. */
391 connection_start_reading_from_linked_conn(connection_t
*conn
)
394 tor_assert(conn
->linked
== 1);
396 if (!conn
->active_on_link
) {
397 conn
->active_on_link
= 1;
398 smartlist_add(active_linked_connection_lst
, conn
);
399 if (!called_loop_once
) {
400 /* This is the first event on the list; we won't be in LOOP_ONCE mode,
401 * so we need to make sure that the event_loop() actually exits at the
402 * end of its run through the current connections and
403 * lets us activate read events for linked connections. */
404 struct timeval tv
= { 0, 0 };
408 tor_assert(smartlist_isin(active_linked_connection_lst
, conn
));
412 /** Tell the main loop to stop reading bytes into <b>conn</b> from its linked
413 * connection, if is currently doing so. Called by connection_stop_reading,
414 * connection_stop_writing, and connection_read. */
416 connection_stop_reading_from_linked_conn(connection_t
*conn
)
419 tor_assert(conn
->linked
== 1);
421 if (conn
->active_on_link
) {
422 conn
->active_on_link
= 0;
423 /* FFFF We could keep an index here so we can smartlist_del
424 * cleanly. On the other hand, this doesn't show up on profiles,
425 * so let's leave it alone for now. */
426 smartlist_remove(active_linked_connection_lst
, conn
);
428 tor_assert(!smartlist_isin(active_linked_connection_lst
, conn
));
432 /** Close all connections that have been scheduled to get closed. */
434 close_closeable_connections(void)
437 for (i
= 0; i
< smartlist_len(closeable_connection_lst
); ) {
438 connection_t
*conn
= smartlist_get(closeable_connection_lst
, i
);
439 if (conn
->conn_array_index
< 0) {
440 connection_unlink(conn
); /* blow it away right now */
442 if (!conn_close_if_marked(conn
->conn_array_index
))
448 /** Libevent callback: this gets invoked when (connection_t*)<b>conn</b> has
449 * some data to read. */
451 conn_read_callback(int fd
, short event
, void *_conn
)
453 connection_t
*conn
= _conn
;
457 log_debug(LD_NET
,"socket %d wants to read.",conn
->s
);
459 assert_connection_ok(conn
, time(NULL
));
461 if (connection_handle_read(conn
) < 0) {
462 if (!conn
->marked_for_close
) {
464 log_warn(LD_BUG
,"Unhandled error on read for %s connection "
466 conn_type_to_string(conn
->type
), conn
->s
);
467 tor_fragile_assert();
469 if (CONN_IS_EDGE(conn
))
470 connection_edge_end_errno(TO_EDGE_CONN(conn
));
471 connection_mark_for_close(conn
);
474 assert_connection_ok(conn
, time(NULL
));
476 if (smartlist_len(closeable_connection_lst
))
477 close_closeable_connections();
480 /** Libevent callback: this gets invoked when (connection_t*)<b>conn</b> has
481 * some data to write. */
483 conn_write_callback(int fd
, short events
, void *_conn
)
485 connection_t
*conn
= _conn
;
489 LOG_FN_CONN(conn
, (LOG_DEBUG
, LD_NET
, "socket %d wants to write.",conn
->s
));
491 assert_connection_ok(conn
, time(NULL
));
493 if (connection_handle_write(conn
, 0) < 0) {
494 if (!conn
->marked_for_close
) {
495 /* this connection is broken. remove it. */
496 log_fn(LOG_WARN
,LD_BUG
,
497 "unhandled error on write for %s connection (fd %d); removing",
498 conn_type_to_string(conn
->type
), conn
->s
);
499 tor_fragile_assert();
500 if (CONN_IS_EDGE(conn
)) {
501 /* otherwise we cry wolf about duplicate close */
502 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
503 if (!edge_conn
->end_reason
)
504 edge_conn
->end_reason
= END_STREAM_REASON_INTERNAL
;
505 edge_conn
->edge_has_sent_end
= 1;
507 connection_close_immediate(conn
); /* So we don't try to flush. */
508 connection_mark_for_close(conn
);
511 assert_connection_ok(conn
, time(NULL
));
513 if (smartlist_len(closeable_connection_lst
))
514 close_closeable_connections();
517 /** If the connection at connection_array[i] is marked for close, then:
518 * - If it has data that it wants to flush, try to flush it.
519 * - If it _still_ has data to flush, and conn->hold_open_until_flushed is
520 * true, then leave the connection open and return.
521 * - Otherwise, remove the connection from connection_array and from
522 * all other lists, close it, and free it.
523 * Returns 1 if the connection was closed, 0 otherwise.
526 conn_close_if_marked(int i
)
532 conn
= smartlist_get(connection_array
, i
);
533 if (!conn
->marked_for_close
)
534 return 0; /* nothing to see here, move along */
536 assert_connection_ok(conn
, now
);
537 assert_all_pending_dns_resolves_ok();
539 log_debug(LD_NET
,"Cleaning up connection (fd %d).",conn
->s
);
540 if ((conn
->s
>= 0 || conn
->linked_conn
) && connection_wants_to_flush(conn
)) {
541 /* s == -1 means it's an incomplete edge connection, or that the socket
542 * has already been closed as unflushable. */
543 ssize_t sz
= connection_bucket_write_limit(conn
, now
);
544 if (!conn
->hold_open_until_flushed
)
546 "Conn (addr %s, fd %d, type %s, state %d) marked, but wants "
547 "to flush %d bytes. (Marked at %s:%d)",
548 escaped_safe_str(conn
->address
),
549 conn
->s
, conn_type_to_string(conn
->type
), conn
->state
,
550 (int)conn
->outbuf_flushlen
,
551 conn
->marked_for_close_file
, conn
->marked_for_close
);
552 if (conn
->linked_conn
) {
553 retval
= move_buf_to_buf(conn
->linked_conn
->inbuf
, conn
->outbuf
,
554 &conn
->outbuf_flushlen
);
556 /* The linked conn will notice that it has data when it notices that
558 connection_start_reading_from_linked_conn(conn
->linked_conn
);
560 log_debug(LD_GENERAL
, "Flushed last %d bytes from a linked conn; "
561 "%d left; flushlen %d; wants-to-flush==%d", retval
,
562 (int)buf_datalen(conn
->outbuf
),
563 (int)conn
->outbuf_flushlen
,
564 connection_wants_to_flush(conn
));
565 } else if (connection_speaks_cells(conn
)) {
566 if (conn
->state
== OR_CONN_STATE_OPEN
) {
567 retval
= flush_buf_tls(TO_OR_CONN(conn
)->tls
, conn
->outbuf
, sz
,
568 &conn
->outbuf_flushlen
);
570 retval
= -1; /* never flush non-open broken tls connections */
572 retval
= flush_buf(conn
->s
, conn
->outbuf
, sz
, &conn
->outbuf_flushlen
);
574 if (retval
>= 0 && /* Technically, we could survive things like
575 TLS_WANT_WRITE here. But don't bother for now. */
576 conn
->hold_open_until_flushed
&& connection_wants_to_flush(conn
)) {
578 LOG_FN_CONN(conn
, (LOG_INFO
,LD_NET
,
579 "Holding conn (fd %d) open for more flushing.",
581 conn
->timestamp_lastwritten
= now
; /* reset so we can flush more */
585 if (connection_wants_to_flush(conn
)) {
587 if (conn
->type
== CONN_TYPE_EXIT
||
588 (conn
->type
== CONN_TYPE_OR
&& server_mode(get_options())) ||
589 (conn
->type
== CONN_TYPE_DIR
&& conn
->purpose
== DIR_PURPOSE_SERVER
))
592 severity
= LOG_NOTICE
;
593 /* XXXX Maybe allow this to happen a certain amount per hour; it usually
595 log_fn(severity
, LD_NET
, "We stalled too much while trying to write %d "
596 "bytes to address %s. If this happens a lot, either "
597 "something is wrong with your network connection, or "
598 "something is wrong with theirs. "
599 "(fd %d, type %s, state %d, marked at %s:%d).",
600 (int)buf_datalen(conn
->outbuf
),
601 escaped_safe_str(conn
->address
), conn
->s
,
602 conn_type_to_string(conn
->type
), conn
->state
,
603 conn
->marked_for_close_file
,
604 conn
->marked_for_close
);
607 connection_unlink(conn
); /* unlink, remove, free */
611 /** We've just tried every dirserver we know about, and none of
612 * them were reachable. Assume the network is down. Change state
613 * so next time an application connection arrives we'll delay it
614 * and try another directory fetch. Kill off all the circuit_wait
615 * streams that are waiting now, since they will all timeout anyway.
618 directory_all_unreachable(time_t now
)
623 stats_n_seconds_working
=0; /* reset it */
625 while ((conn
= connection_get_by_type_state(CONN_TYPE_AP
,
626 AP_CONN_STATE_CIRCUIT_WAIT
))) {
627 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
629 "Is your network connection down? "
630 "Failing connection to '%s:%d'.",
631 safe_str(edge_conn
->socks_request
->address
),
632 edge_conn
->socks_request
->port
);
633 connection_mark_unattached_ap(edge_conn
,
634 END_STREAM_REASON_NET_UNREACHABLE
);
636 control_event_general_status(LOG_ERR
, "DIR_ALL_UNREACHABLE");
639 /** This function is called whenever we successfully pull down some new
640 * network statuses or server descriptors. */
642 directory_info_has_arrived(time_t now
, int from_cache
)
644 or_options_t
*options
= get_options();
646 if (!router_have_minimum_dir_info()) {
647 int quiet
= directory_too_idle_to_fetch_descriptors(options
, now
);
648 log(quiet
? LOG_INFO
: LOG_NOTICE
, LD_DIR
,
649 "I learned some more directory information, but not enough to "
650 "build a circuit: %s", get_dir_info_status_string());
651 update_router_descriptor_downloads(now
);
654 if (directory_fetches_from_authorities(options
))
655 update_router_descriptor_downloads(now
);
657 /* if we have enough dir info, then update our guard status with
658 * whatever we just learned. */
659 entry_guards_compute_status();
660 /* Don't even bother trying to get extrainfo until the rest of our
661 * directory info is up-to-date */
662 if (options
->DownloadExtraInfo
)
663 update_extrainfo_downloads(now
);
666 if (server_mode(options
) && !we_are_hibernating() && !from_cache
&&
667 (has_completed_circuit
|| !any_predicted_circuits(now
)))
668 consider_testing_reachability(1, 1);
671 /** Perform regular maintenance tasks for a single connection. This
672 * function gets run once per second per connection by run_scheduled_events.
675 run_connection_housekeeping(int i
, time_t now
)
678 connection_t
*conn
= smartlist_get(connection_array
, i
);
679 or_options_t
*options
= get_options();
680 or_connection_t
*or_conn
;
682 if (conn
->outbuf
&& !buf_datalen(conn
->outbuf
) && conn
->type
== CONN_TYPE_OR
)
683 TO_OR_CONN(conn
)->timestamp_lastempty
= now
;
685 if (conn
->marked_for_close
) {
686 /* nothing to do here */
690 /* Expire any directory connections that haven't been active (sent
691 * if a server or received if a client) for 5 min */
692 if (conn
->type
== CONN_TYPE_DIR
&&
693 ((DIR_CONN_IS_SERVER(conn
) &&
694 conn
->timestamp_lastwritten
+ DIR_CONN_MAX_STALL
< now
) ||
695 (!DIR_CONN_IS_SERVER(conn
) &&
696 conn
->timestamp_lastread
+ DIR_CONN_MAX_STALL
< now
))) {
697 log_info(LD_DIR
,"Expiring wedged directory conn (fd %d, purpose %d)",
698 conn
->s
, conn
->purpose
);
699 /* This check is temporary; it's to let us know whether we should consider
700 * parsing partial serverdesc responses. */
701 if (conn
->purpose
== DIR_PURPOSE_FETCH_SERVERDESC
&&
702 buf_datalen(conn
->inbuf
)>=1024) {
703 log_info(LD_DIR
,"Trying to extract information from wedged server desc "
705 connection_dir_reached_eof(TO_DIR_CONN(conn
));
707 connection_mark_for_close(conn
);
712 if (!connection_speaks_cells(conn
))
713 return; /* we're all done here, the rest is just for OR conns */
715 or_conn
= TO_OR_CONN(conn
);
717 if (!or_conn
->is_bad_for_new_circs
) {
718 if (conn
->timestamp_created
+ TIME_BEFORE_OR_CONN_IS_TOO_OLD
< now
) {
720 "Marking OR conn to %s:%d as too old for new circuits "
721 "(fd %d, %d secs old).",
722 conn
->address
, conn
->port
, conn
->s
,
723 (int)(now
- conn
->timestamp_created
));
724 or_conn
->is_bad_for_new_circs
= 1;
726 or_connection_t
*best
=
727 connection_or_get_by_identity_digest(or_conn
->identity_digest
);
728 if (best
&& best
!= or_conn
&&
729 (conn
->state
== OR_CONN_STATE_OPEN
||
730 now
> conn
->timestamp_created
+ TLS_HANDSHAKE_TIMEOUT
)) {
731 /* We only mark as obsolete connections that already are in
732 * OR_CONN_STATE_OPEN, i.e. that have finished their TLS handshaking.
733 * This is necessary because authorities judge whether a router is
734 * reachable based on whether they were able to TLS handshake with it
735 * recently. Without this check we would expire connections too
736 * early for router->last_reachable to be updated.
739 "Marking duplicate conn to %s:%d as too old for new circuits "
740 "(fd %d, %d secs old).",
741 conn
->address
, conn
->port
, conn
->s
,
742 (int)(now
- conn
->timestamp_created
));
743 or_conn
->is_bad_for_new_circs
= 1;
748 if (or_conn
->is_bad_for_new_circs
&& !or_conn
->n_circuits
) {
749 /* no unmarked circs -- mark it now */
751 "Expiring non-used OR connection to fd %d (%s:%d) [Too old].",
752 conn
->s
, conn
->address
, conn
->port
);
753 if (conn
->state
== OR_CONN_STATE_CONNECTING
)
754 connection_or_connect_failed(TO_OR_CONN(conn
),
755 END_OR_CONN_REASON_TIMEOUT
,
756 "Tor gave up on the connection");
757 connection_mark_for_close(conn
);
758 conn
->hold_open_until_flushed
= 1;
762 /* If we haven't written to an OR connection for a while, then either nuke
763 the connection or send a keepalive, depending. */
764 if (now
>= conn
->timestamp_lastwritten
+ options
->KeepalivePeriod
) {
765 routerinfo_t
*router
= router_get_by_digest(or_conn
->identity_digest
);
766 int maxCircuitlessPeriod
= options
->MaxCircuitDirtiness
*3/2;
767 if (!connection_state_is_open(conn
)) {
768 /* We never managed to actually get this connection open and happy. */
769 log_info(LD_OR
,"Expiring non-open OR connection to fd %d (%s:%d).",
770 conn
->s
,conn
->address
, conn
->port
);
771 connection_mark_for_close(conn
);
772 conn
->hold_open_until_flushed
= 1;
773 } else if (we_are_hibernating() && !or_conn
->n_circuits
&&
774 !buf_datalen(conn
->outbuf
)) {
775 /* We're hibernating, there's no circuits, and nothing to flush.*/
776 log_info(LD_OR
,"Expiring non-used OR connection to fd %d (%s:%d) "
777 "[Hibernating or exiting].",
778 conn
->s
,conn
->address
, conn
->port
);
779 connection_mark_for_close(conn
);
780 conn
->hold_open_until_flushed
= 1;
781 } else if (!clique_mode(options
) && !or_conn
->n_circuits
&&
782 now
>= or_conn
->timestamp_last_added_nonpadding
+
783 maxCircuitlessPeriod
&&
784 (!router
|| !server_mode(options
) ||
785 !router_is_clique_mode(router
))) {
786 log_info(LD_OR
,"Expiring non-used OR connection to fd %d (%s:%d) "
787 "[Not in clique mode].",
788 conn
->s
,conn
->address
, conn
->port
);
789 connection_mark_for_close(conn
);
790 conn
->hold_open_until_flushed
= 1;
792 now
>= or_conn
->timestamp_lastempty
+ options
->KeepalivePeriod
*10 &&
793 now
>= conn
->timestamp_lastwritten
+ options
->KeepalivePeriod
*10) {
794 log_fn(LOG_PROTOCOL_WARN
,LD_PROTOCOL
,
795 "Expiring stuck OR connection to fd %d (%s:%d). (%d bytes to "
796 "flush; %d seconds since last write)",
797 conn
->s
, conn
->address
, conn
->port
,
798 (int)buf_datalen(conn
->outbuf
),
799 (int)(now
-conn
->timestamp_lastwritten
));
800 connection_mark_for_close(conn
);
801 } else if (!buf_datalen(conn
->outbuf
)) {
802 /* either in clique mode, or we've got a circuit. send a padding cell. */
803 log_fn(LOG_DEBUG
,LD_OR
,"Sending keepalive to (%s:%d)",
804 conn
->address
, conn
->port
);
805 memset(&cell
,0,sizeof(cell_t
));
806 cell
.command
= CELL_PADDING
;
807 connection_or_write_cell_to_buf(&cell
, or_conn
);
812 /** Honor a NEWNYM request: make future requests unlinkability to past
815 signewnym_impl(time_t now
)
817 circuit_expire_all_dirty_circs();
818 addressmap_clear_transient();
819 time_of_last_signewnym
= now
;
820 signewnym_is_pending
= 0;
823 /** Perform regular maintenance tasks. This function gets run once per
824 * second by second_elapsed_callback().
827 run_scheduled_events(time_t now
)
829 static time_t last_rotated_x509_certificate
= 0;
830 static time_t time_to_check_v3_certificate
= 0;
831 static time_t time_to_check_listeners
= 0;
832 static time_t time_to_check_descriptor
= 0;
833 static time_t time_to_check_ipaddress
= 0;
834 static time_t time_to_shrink_memory
= 0;
835 static time_t time_to_try_getting_descriptors
= 0;
836 static time_t time_to_reset_descriptor_failures
= 0;
837 static time_t time_to_add_entropy
= 0;
838 static time_t time_to_write_hs_statistics
= 0;
839 static time_t time_to_write_bridge_status_file
= 0;
840 static time_t time_to_downrate_stability
= 0;
841 static time_t time_to_save_stability
= 0;
842 static time_t time_to_clean_caches
= 0;
843 static time_t time_to_recheck_bandwidth
= 0;
844 static time_t time_to_check_for_expired_networkstatus
= 0;
845 static time_t time_to_dump_geoip_stats
= 0;
846 static time_t time_to_retry_dns_init
= 0;
847 or_options_t
*options
= get_options();
851 /** 0. See if we've been asked to shut down and our timeout has
852 * expired; or if our bandwidth limits are exhausted and we
853 * should hibernate; or if it's time to wake up from hibernation.
855 consider_hibernation(now
);
857 /* 0b. If we've deferred a signewnym, make sure it gets handled
859 if (signewnym_is_pending
&&
860 time_of_last_signewnym
+ MAX_SIGNEWNYM_RATE
<= now
) {
861 log(LOG_INFO
, LD_CONTROL
, "Honoring delayed NEWNYM request");
865 /** 1a. Every MIN_ONION_KEY_LIFETIME seconds, rotate the onion keys,
866 * shut down and restart all cpuworkers, and update the directory if
869 if (server_mode(options
) &&
870 get_onion_key_set_at()+MIN_ONION_KEY_LIFETIME
< now
) {
871 log_info(LD_GENERAL
,"Rotating onion key.");
874 if (router_rebuild_descriptor(1)<0) {
875 log_info(LD_CONFIG
, "Couldn't rebuild router descriptor");
877 if (advertised_server_mode())
878 router_upload_dir_desc_to_dirservers(0);
881 if (time_to_try_getting_descriptors
< now
) {
882 update_router_descriptor_downloads(now
);
883 update_extrainfo_downloads(now
);
884 if (options
->UseBridges
)
885 fetch_bridge_descriptors(now
);
886 if (router_have_minimum_dir_info())
887 time_to_try_getting_descriptors
= now
+ LAZY_DESCRIPTOR_RETRY_INTERVAL
;
889 time_to_try_getting_descriptors
= now
+ GREEDY_DESCRIPTOR_RETRY_INTERVAL
;
892 if (time_to_reset_descriptor_failures
< now
) {
893 router_reset_descriptor_download_failures();
894 time_to_reset_descriptor_failures
=
895 now
+ DESCRIPTOR_FAILURE_RESET_INTERVAL
;
898 /** 1b. Every MAX_SSL_KEY_LIFETIME seconds, we change our TLS context. */
899 if (!last_rotated_x509_certificate
)
900 last_rotated_x509_certificate
= now
;
901 if (last_rotated_x509_certificate
+MAX_SSL_KEY_LIFETIME
< now
) {
902 log_info(LD_GENERAL
,"Rotating tls context.");
903 if (tor_tls_context_new(get_identity_key(), MAX_SSL_KEY_LIFETIME
) < 0) {
904 log_warn(LD_BUG
, "Error reinitializing TLS context");
905 /* XXX is it a bug here, that we just keep going? -RD */
907 last_rotated_x509_certificate
= now
;
908 /* We also make sure to rotate the TLS connections themselves if they've
909 * been up for too long -- but that's done via is_bad_for_new_circs in
910 * connection_run_housekeeping() above. */
913 if (time_to_add_entropy
< now
) {
914 if (time_to_add_entropy
) {
915 /* We already seeded once, so don't die on failure. */
918 /** How often do we add more entropy to OpenSSL's RNG pool? */
919 #define ENTROPY_INTERVAL (60*60)
920 time_to_add_entropy
= now
+ ENTROPY_INTERVAL
;
923 /** 1c. If we have to change the accounting interval or record
924 * bandwidth used in this accounting interval, do so. */
925 if (accounting_is_enabled(options
))
926 accounting_run_housekeeping(now
);
928 if (now
% 10 == 0 && (authdir_mode_tests_reachability(options
)) &&
929 !we_are_hibernating()) {
930 /* try to determine reachability of the other Tor relays */
931 dirserv_test_reachability(now
, 0);
934 /** 1d. Periodically, we discount older stability information so that new
935 * stability info counts more, and save the stability information to disk as
937 if (time_to_downrate_stability
< now
)
938 time_to_downrate_stability
= rep_hist_downrate_old_runs(now
);
939 if (authdir_mode_tests_reachability(options
)) {
940 if (time_to_save_stability
< now
) {
941 if (time_to_save_stability
&& rep_hist_record_mtbf_data()<0) {
942 log_warn(LD_GENERAL
, "Couldn't store mtbf data.");
944 #define SAVE_STABILITY_INTERVAL (30*60)
945 time_to_save_stability
= now
+ SAVE_STABILITY_INTERVAL
;
949 /* 1e. Periodicaly, if we're a v3 authority, we check whether our cert is
950 * close to expiring and warn the admin if it is. */
951 if (time_to_check_v3_certificate
< now
) {
952 v3_authority_check_key_expiry();
953 #define CHECK_V3_CERTIFICATE_INTERVAL (5*60)
954 time_to_check_v3_certificate
= now
+ CHECK_V3_CERTIFICATE_INTERVAL
;
957 /* 1f. Check whether our networkstatus has expired.
959 if (time_to_check_for_expired_networkstatus
< now
) {
960 networkstatus_t
*ns
= networkstatus_get_latest_consensus();
961 /*XXXX RD: This value needs to be the same as REASONABLY_LIVE_TIME in
962 * networkstatus_get_reasonably_live_consensus(), but that value is way
963 * way too high. Arma: is the bridge issue there resolved yet? -NM */
964 #define NS_EXPIRY_SLOP (24*60*60)
965 if (ns
&& ns
->valid_until
< now
+NS_EXPIRY_SLOP
&&
966 router_have_minimum_dir_info()) {
967 router_dir_info_changed();
969 #define CHECK_EXPIRED_NS_INTERVAL (2*60)
970 time_to_check_for_expired_networkstatus
= now
+ CHECK_EXPIRED_NS_INTERVAL
;
973 if (time_to_dump_geoip_stats
< now
) {
974 #define DUMP_GEOIP_STATS_INTERVAL (60*60);
975 if (time_to_dump_geoip_stats
)
977 time_to_dump_geoip_stats
= now
+ DUMP_GEOIP_STATS_INTERVAL
;
980 /* Remove old information from rephist and the rend cache. */
981 if (time_to_clean_caches
< now
) {
982 rep_history_clean(now
- options
->RephistTrackTime
);
984 rend_cache_clean_v2_descs_as_dir();
985 #define CLEAN_CACHES_INTERVAL (30*60)
986 time_to_clean_caches
= now
+ CLEAN_CACHES_INTERVAL
;
989 #define RETRY_DNS_INTERVAL (10*60)
990 /* If we're a server and initializing dns failed, retry periodically. */
991 if (time_to_retry_dns_init
< now
) {
992 time_to_retry_dns_init
= now
+ RETRY_DNS_INTERVAL
;
993 if (server_mode(options
) && has_dns_init_failed())
997 /** 2. Periodically, we consider force-uploading our descriptor
998 * (if we've passed our internal checks). */
1000 /** How often do we check whether part of our router info has changed in a way
1001 * that would require an upload? */
1002 #define CHECK_DESCRIPTOR_INTERVAL (60)
1003 /** How often do we (as a router) check whether our IP address has changed? */
1004 #define CHECK_IPADDRESS_INTERVAL (15*60)
1006 /* 2b. Once per minute, regenerate and upload the descriptor if the old
1007 * one is inaccurate. */
1008 if (time_to_check_descriptor
< now
) {
1009 static int dirport_reachability_count
= 0;
1010 time_to_check_descriptor
= now
+ CHECK_DESCRIPTOR_INTERVAL
;
1011 check_descriptor_bandwidth_changed(now
);
1012 if (time_to_check_ipaddress
< now
) {
1013 time_to_check_ipaddress
= now
+ CHECK_IPADDRESS_INTERVAL
;
1014 check_descriptor_ipaddress_changed(now
);
1016 /** If our router descriptor ever goes this long without being regenerated
1017 * because something changed, we force an immediate regenerate-and-upload. */
1018 #define FORCE_REGENERATE_DESCRIPTOR_INTERVAL (18*60*60)
1019 mark_my_descriptor_dirty_if_older_than(
1020 now
- FORCE_REGENERATE_DESCRIPTOR_INTERVAL
);
1021 consider_publishable_server(0);
1022 /* also, check religiously for reachability, if it's within the first
1023 * 20 minutes of our uptime. */
1024 if (server_mode(options
) &&
1025 (has_completed_circuit
|| !any_predicted_circuits(now
)) &&
1026 !we_are_hibernating()) {
1027 if (stats_n_seconds_working
< TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT
) {
1028 consider_testing_reachability(1, dirport_reachability_count
==0);
1029 if (++dirport_reachability_count
> 5)
1030 dirport_reachability_count
= 0;
1031 } else if (time_to_recheck_bandwidth
< now
) {
1032 /* If we haven't checked for 12 hours and our bandwidth estimate is
1033 * low, do another bandwidth test. This is especially important for
1034 * bridges, since they might go long periods without much use. */
1035 routerinfo_t
*me
= router_get_my_routerinfo();
1036 if (time_to_recheck_bandwidth
&& me
&&
1037 me
->bandwidthcapacity
< me
->bandwidthrate
&&
1038 me
->bandwidthcapacity
< 51200) {
1039 reset_bandwidth_test();
1041 #define BANDWIDTH_RECHECK_INTERVAL (12*60*60)
1042 time_to_recheck_bandwidth
= now
+ BANDWIDTH_RECHECK_INTERVAL
;
1046 /* If any networkstatus documents are no longer recent, we need to
1047 * update all the descriptors' running status. */
1048 /* purge obsolete entries */
1049 networkstatus_v2_list_clean(now
);
1050 /* Remove dead routers. */
1051 routerlist_remove_old_routers();
1053 /* Also, once per minute, check whether we want to download any
1054 * networkstatus documents.
1056 update_networkstatus_downloads(now
);
1059 /** 2c. Let directory voting happen. */
1060 if (authdir_mode_v3(options
))
1061 dirvote_act(options
, now
);
1063 /** 3a. Every second, we examine pending circuits and prune the
1064 * ones which have been pending for more than a few seconds.
1065 * We do this before step 4, so it can try building more if
1066 * it's not comfortable with the number of available circuits.
1068 circuit_expire_building(now
);
1070 /** 3b. Also look at pending streams and prune the ones that 'began'
1071 * a long time ago but haven't gotten a 'connected' yet.
1072 * Do this before step 4, so we can put them back into pending
1073 * state to be picked up by the new circuit.
1075 connection_ap_expire_beginning();
1077 /** 3c. And expire connections that we've held open for too long.
1079 connection_expire_held_open();
1081 /** 3d. And every 60 seconds, we relaunch listeners if any died. */
1082 if (!we_are_hibernating() && time_to_check_listeners
< now
) {
1083 retry_all_listeners(NULL
, NULL
);
1084 time_to_check_listeners
= now
+60;
1087 /** 4. Every second, we try a new circuit if there are no valid
1088 * circuits. Every NewCircuitPeriod seconds, we expire circuits
1089 * that became dirty more than MaxCircuitDirtiness seconds ago,
1090 * and we make a new circ if there are no clean circuits.
1092 have_dir_info
= router_have_minimum_dir_info();
1093 if (have_dir_info
&& !we_are_hibernating())
1094 circuit_build_needed_circs(now
);
1096 /** 5. We do housekeeping for each connection... */
1097 for (i
=0;i
<smartlist_len(connection_array
);i
++) {
1098 run_connection_housekeeping(i
, now
);
1100 if (time_to_shrink_memory
< now
) {
1101 SMARTLIST_FOREACH(connection_array
, connection_t
*, conn
, {
1103 buf_shrink(conn
->outbuf
);
1105 buf_shrink(conn
->inbuf
);
1108 buf_shrink_freelists(0);
1109 /** How often do we check buffers and pools for empty space that can be
1111 #define MEM_SHRINK_INTERVAL (60)
1112 time_to_shrink_memory
= now
+ MEM_SHRINK_INTERVAL
;
1115 /** 6. And remove any marked circuits... */
1116 circuit_close_all_marked();
1118 /** 7. And upload service descriptors if necessary. */
1119 if (has_completed_circuit
&& !we_are_hibernating()) {
1120 rend_consider_services_upload(now
);
1121 rend_consider_descriptor_republication();
1124 /** 8. and blow away any connections that need to die. have to do this now,
1125 * because if we marked a conn for close and left its socket -1, then
1126 * we'll pass it to poll/select and bad things will happen.
1128 close_closeable_connections();
1130 /** 8b. And if anything in our state is ready to get flushed to disk, we
1134 /** 9. and if we're a server, check whether our DNS is telling stories to
1136 if (server_mode(options
) && time_to_check_for_correct_dns
< now
) {
1137 if (!time_to_check_for_correct_dns
) {
1138 time_to_check_for_correct_dns
= now
+ 60 + crypto_rand_int(120);
1140 dns_launch_correctness_checks();
1141 time_to_check_for_correct_dns
= now
+ 12*3600 +
1142 crypto_rand_int(12*3600);
1146 /** 10. write hidden service usage statistic to disk */
1147 if (options
->HSAuthorityRecordStats
&& time_to_write_hs_statistics
< now
) {
1148 hs_usage_write_statistics_to_file(now
);
1149 #define WRITE_HSUSAGE_INTERVAL (30*60)
1150 time_to_write_hs_statistics
= now
+WRITE_HSUSAGE_INTERVAL
;
1152 /** 10b. write bridge networkstatus file to disk */
1153 if (options
->BridgeAuthoritativeDir
&&
1154 time_to_write_bridge_status_file
< now
) {
1155 networkstatus_dump_bridge_status_to_file(now
);
1156 #define BRIDGE_STATUSFILE_INTERVAL (30*60)
1157 time_to_write_bridge_status_file
= now
+BRIDGE_STATUSFILE_INTERVAL
;
1161 /** Libevent timer: used to invoke second_elapsed_callback() once per
1163 static struct event
*timeout_event
= NULL
;
1164 /** Number of libevent errors in the last second: we die if we get too many. */
1165 static int n_libevent_errors
= 0;
1167 /** Libevent callback: invoked once every second. */
1169 second_elapsed_callback(int fd
, short event
, void *args
)
1171 /* XXXX This could be sensibly refactored into multiple callbacks, and we
1172 * could use libevent's timers for this rather than checking the current
1173 * time against a bunch of timeouts every second. */
1174 static struct timeval one_second
;
1175 static long current_second
= 0;
1177 size_t bytes_written
;
1179 int seconds_elapsed
;
1180 or_options_t
*options
= get_options();
1184 if (!timeout_event
) {
1185 timeout_event
= tor_malloc_zero(sizeof(struct event
));
1186 evtimer_set(timeout_event
, second_elapsed_callback
, NULL
);
1187 one_second
.tv_sec
= 1;
1188 one_second
.tv_usec
= 0;
1191 n_libevent_errors
= 0;
1193 /* log_fn(LOG_NOTICE, "Tick."); */
1195 update_approx_time(now
);
1197 /* the second has rolled over. check more stuff. */
1198 bytes_written
= stats_prev_global_write_bucket
- global_write_bucket
;
1199 bytes_read
= stats_prev_global_read_bucket
- global_read_bucket
;
1200 seconds_elapsed
= current_second
? (int)(now
- current_second
) : 0;
1201 stats_n_bytes_read
+= bytes_read
;
1202 stats_n_bytes_written
+= bytes_written
;
1203 if (accounting_is_enabled(options
) && seconds_elapsed
>= 0)
1204 accounting_add_bytes(bytes_read
, bytes_written
, seconds_elapsed
);
1205 control_event_bandwidth_used((uint32_t)bytes_read
,(uint32_t)bytes_written
);
1206 control_event_stream_bandwidth_used();
1208 if (seconds_elapsed
> 0)
1209 connection_bucket_refill(seconds_elapsed
, now
);
1210 stats_prev_global_read_bucket
= global_read_bucket
;
1211 stats_prev_global_write_bucket
= global_write_bucket
;
1213 if (server_mode(options
) &&
1214 !we_are_hibernating() &&
1215 seconds_elapsed
> 0 &&
1216 has_completed_circuit
&&
1217 stats_n_seconds_working
/ TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT
!=
1218 (stats_n_seconds_working
+seconds_elapsed
) /
1219 TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT
) {
1220 /* every 20 minutes, check and complain if necessary */
1221 routerinfo_t
*me
= router_get_my_routerinfo();
1222 if (me
&& !check_whether_orport_reachable())
1223 log_warn(LD_CONFIG
,"Your server (%s:%d) has not managed to confirm that "
1224 "its ORPort is reachable. Please check your firewalls, ports, "
1225 "address, /etc/hosts file, etc.",
1226 me
->address
, me
->or_port
);
1227 if (me
&& !check_whether_dirport_reachable())
1229 "Your server (%s:%d) has not managed to confirm that its "
1230 "DirPort is reachable. Please check your firewalls, ports, "
1231 "address, /etc/hosts file, etc.",
1232 me
->address
, me
->dir_port
);
1235 /** If more than this many seconds have elapsed, probably the clock
1236 * jumped: doesn't count. */
1237 #define NUM_JUMPED_SECONDS_BEFORE_WARN 100
1238 if (seconds_elapsed
< -NUM_JUMPED_SECONDS_BEFORE_WARN
||
1239 seconds_elapsed
>= NUM_JUMPED_SECONDS_BEFORE_WARN
) {
1240 circuit_note_clock_jumped(seconds_elapsed
);
1241 /* XXX if the time jumps *back* many months, do our events in
1242 * run_scheduled_events() recover? I don't think they do. -RD */
1243 } else if (seconds_elapsed
> 0)
1244 stats_n_seconds_working
+= seconds_elapsed
;
1246 run_scheduled_events(now
);
1248 current_second
= now
; /* remember which second it is, for next time */
1251 if (current_second
% 300 == 0) {
1252 rep_history_clean(current_second
- options
->RephistTrackTime
);
1253 dumpmemusage(get_min_log_level()<LOG_INFO
?
1254 get_min_log_level() : LOG_INFO
);
1258 if (evtimer_add(timeout_event
, &one_second
))
1260 "Error from libevent when setting one-second timeout event");
1264 /** Called when a possibly ignorable libevent error occurs; ensures that we
1265 * don't get into an infinite loop by ignoring too many errors from
1268 got_libevent_error(void)
1270 if (++n_libevent_errors
> 8) {
1271 log_err(LD_NET
, "Too many libevent errors in one second; dying");
1278 #define UPTIME_CUTOFF_FOR_NEW_BANDWIDTH_TEST (6*60*60)
1280 /** Called when our IP address seems to have changed. <b>at_interface</b>
1281 * should be true if we detected a change in our interface, and false if we
1282 * detected a change in our published address. */
1284 ip_address_changed(int at_interface
)
1286 int server
= server_mode(get_options());
1290 /* Okay, change our keys. */
1295 if (stats_n_seconds_working
> UPTIME_CUTOFF_FOR_NEW_BANDWIDTH_TEST
)
1296 reset_bandwidth_test();
1297 stats_n_seconds_working
= 0;
1298 router_reset_reachability();
1299 mark_my_descriptor_dirty();
1303 dns_servers_relaunch_checks();
1306 /** Forget what we've learned about the correctness of our DNS servers, and
1307 * start learning again. */
1309 dns_servers_relaunch_checks(void)
1311 if (server_mode(get_options())) {
1312 dns_reset_correctness_checks();
1313 time_to_check_for_correct_dns
= 0;
1317 /** Called when we get a SIGHUP: reload configuration files and keys,
1318 * retry all connections, and so on. */
1322 or_options_t
*options
= get_options();
1325 dmalloc_log_stats();
1326 dmalloc_log_changed(0, 1, 0, 0);
1329 log_notice(LD_GENERAL
,"Received reload signal (hup). Reloading config and "
1330 "resetting internal state.");
1331 if (accounting_is_enabled(options
))
1332 accounting_record_bandwidth_usage(time(NULL
), get_or_state());
1334 router_reset_warnings();
1335 routerlist_reset_warnings();
1336 addressmap_clear_transient();
1337 /* first, reload config variables, in case they've changed */
1338 if (options
->ReloadTorrcOnSIGHUP
) {
1339 /* no need to provide argc/v, they've been cached in init_from_config */
1340 if (options_init_from_torrc(0, NULL
) < 0) {
1341 log_err(LD_CONFIG
,"Reading config failed--see warnings above. "
1342 "For usage, try -h.");
1345 options
= get_options(); /* they have changed now */
1347 log_notice(LD_GENERAL
, "Not reloading config file: the controller told "
1350 if (authdir_mode_handles_descs(options
, -1)) {
1351 /* reload the approved-routers file */
1352 if (dirserv_load_fingerprint_file() < 0) {
1353 /* warnings are logged from dirserv_load_fingerprint_file() directly */
1354 log_info(LD_GENERAL
, "Error reloading fingerprints. "
1355 "Continuing with old list.");
1359 /* Rotate away from the old dirty circuits. This has to be done
1360 * after we've read the new options, but before we start using
1361 * circuits for directory fetches. */
1362 circuit_expire_all_dirty_circs();
1364 /* retry appropriate downloads */
1365 router_reset_status_download_failures();
1366 router_reset_descriptor_download_failures();
1367 update_networkstatus_downloads(time(NULL
));
1369 /* We'll retry routerstatus downloads in about 10 seconds; no need to
1370 * force a retry there. */
1372 if (server_mode(options
)) {
1373 /* Restart cpuworker and dnsworker processes, so they get up-to-date
1374 * configuration options. */
1375 cpuworkers_rotate();
1381 /** Tor main loop. */
1388 /* initialize dns resolve map, spawn workers if needed */
1389 if (dns_init() < 0) {
1390 if (get_options()->ServerDNSAllowBrokenConfig
)
1391 log_warn(LD_GENERAL
, "Couldn't set up any working nameservers. "
1392 "Network not up yet? Will try again soon.");
1394 log_err(LD_GENERAL
,"Error initializing dns subsystem; exiting. To "
1395 "retry instead, set the ServerDNSAllowBrokenResolvConf option.");
1401 /* load the private keys, if we're supposed to have them, and set up the
1403 if (! identity_key_is_set()) {
1404 if (init_keys() < 0) {
1405 log_err(LD_BUG
,"Error initializing keys; exiting");
1410 /* Set up the packed_cell_t memory pool. */
1413 /* Set up our buckets */
1414 connection_bucket_init();
1415 stats_prev_global_read_bucket
= global_read_bucket
;
1416 stats_prev_global_write_bucket
= global_write_bucket
;
1418 /* initialize the bootstrap status events to know we're starting up */
1419 control_event_bootstrap(BOOTSTRAP_STATUS_STARTING
, 0);
1421 if (trusted_dirs_reload_certs())
1423 if (router_reload_v2_networkstatus()) {
1426 if (router_reload_consensus_networkstatus()) {
1429 /* load the routers file, or assign the defaults. */
1430 if (router_reload_router_list()) {
1433 /* load the networkstatuses. (This launches a download for new routers as
1437 directory_info_has_arrived(now
, 1);
1439 if (authdir_mode_tests_reachability(get_options())) {
1440 /* the directory is already here, run startup things */
1441 dirserv_test_reachability(now
, 1);
1444 if (server_mode(get_options())) {
1445 /* launch cpuworkers. Need to do this *after* we've read the onion key. */
1449 /* set up once-a-second callback. */
1450 second_elapsed_callback(0,0,NULL
);
1453 if (nt_service_is_stopping())
1457 /* Make it easier to tell whether libevent failure is our fault or not. */
1460 /* All active linked conns should get their read events activated. */
1461 SMARTLIST_FOREACH(active_linked_connection_lst
, connection_t
*, conn
,
1462 event_active(conn
->read_event
, EV_READ
, 1));
1463 called_loop_once
= smartlist_len(active_linked_connection_lst
) ? 1 : 0;
1465 update_approx_time(time(NULL
));
1467 /* poll until we have an event, or the second ends, or until we have
1468 * some active linked connections to trigger events for. */
1469 loop_result
= event_loop(called_loop_once
? EVLOOP_ONCE
: 0);
1471 /* let catch() handle things like ^c, and otherwise don't worry about it */
1472 if (loop_result
< 0) {
1473 int e
= tor_socket_errno(-1);
1474 /* let the program survive things like ^z */
1475 if (e
!= EINTR
&& !ERRNO_IS_EINPROGRESS(e
)) {
1476 #ifdef HAVE_EVENT_GET_METHOD
1477 log_err(LD_NET
,"libevent call with %s failed: %s [%d]",
1478 event_get_method(), tor_socket_strerror(e
), e
);
1480 log_err(LD_NET
,"libevent call failed: %s [%d]",
1481 tor_socket_strerror(e
), e
);
1485 } else if (e
== EINVAL
) {
1486 log_warn(LD_NET
, "EINVAL from libevent: should you upgrade libevent?");
1487 if (got_libevent_error())
1491 if (ERRNO_IS_EINPROGRESS(e
))
1493 "libevent call returned EINPROGRESS? Please report.");
1494 log_debug(LD_NET
,"libevent call interrupted.");
1495 /* You can't trust the results of this poll(). Go back to the
1496 * top of the big for loop. */
1503 /** Used to implement the SIGNAL control command: if we accept
1504 * <b>the_signal</b> as a remote pseudo-signal, act on it. */
1505 /* We don't re-use catch() here because:
1506 * 1. We handle a different set of signals than those allowed in catch.
1507 * 2. Platforms without signal() are unlikely to define SIGfoo.
1508 * 3. The control spec is defined to use fixed numeric signal values
1509 * which just happen to match the unix values.
1512 control_signal_act(int the_signal
)
1517 signal_callback(0,0,(void*)(uintptr_t)SIGHUP
);
1520 signal_callback(0,0,(void*)(uintptr_t)SIGINT
);
1523 signal_callback(0,0,(void*)(uintptr_t)SIGUSR1
);
1526 signal_callback(0,0,(void*)(uintptr_t)SIGUSR2
);
1529 signal_callback(0,0,(void*)(uintptr_t)SIGTERM
);
1532 signal_callback(0,0,(void*)(uintptr_t)SIGNEWNYM
);
1534 case SIGCLEARDNSCACHE
:
1535 signal_callback(0,0,(void*)(uintptr_t)SIGCLEARDNSCACHE
);
1538 log_warn(LD_BUG
, "Unrecognized signal number %d.", the_signal
);
1543 /** Libevent callback: invoked when we get a signal.
1546 signal_callback(int fd
, short events
, void *arg
)
1548 uintptr_t sig
= (uintptr_t)arg
;
1554 log_notice(LD_GENERAL
,"Catching signal TERM, exiting cleanly.");
1559 if (!server_mode(get_options())) { /* do it now */
1560 log_notice(LD_GENERAL
,"Interrupt: exiting cleanly.");
1564 hibernate_begin_shutdown();
1568 log_debug(LD_GENERAL
,"Caught sigpipe. Ignoring.");
1572 /* prefer to log it at INFO, but make sure we always see it */
1573 dumpstats(get_min_log_level()<LOG_INFO
? get_min_log_level() : LOG_INFO
);
1576 switch_logs_debug();
1577 log_debug(LD_GENERAL
,"Caught USR2, going to loglevel debug. "
1578 "Send HUP to change back.");
1582 log_warn(LD_CONFIG
,"Restart failed (config error?). Exiting.");
1589 while (waitpid(-1,NULL
,WNOHANG
) > 0) ; /* keep reaping until no more
1594 time_t now
= time(NULL
);
1595 if (time_of_last_signewnym
+ MAX_SIGNEWNYM_RATE
> now
) {
1596 signewnym_is_pending
= 1;
1597 log(LOG_NOTICE
, LD_CONTROL
,
1598 "Rate limiting NEWNYM request: delaying by %d second(s)",
1599 (int)(MAX_SIGNEWNYM_RATE
+time_of_last_signewnym
-now
));
1601 signewnym_impl(now
);
1605 case SIGCLEARDNSCACHE
:
1606 addressmap_clear_transient();
1611 extern uint64_t rephist_total_alloc
;
1612 extern uint32_t rephist_total_num
;
1615 * Write current memory usage information to the log.
1618 dumpmemusage(int severity
)
1620 connection_dump_buffer_mem_stats(severity
);
1621 log(severity
, LD_GENERAL
, "In rephist: "U64_FORMAT
" used by %d Tors.",
1622 U64_PRINTF_ARG(rephist_total_alloc
), rephist_total_num
);
1623 dump_routerlist_mem_usage(severity
);
1624 dump_cell_pool_usage(severity
);
1625 buf_dump_freelist_sizes(severity
);
1626 tor_log_mallinfo(severity
);
1629 /** Write all statistics to the log, with log level 'severity'. Called
1630 * in response to a SIGUSR1. */
1632 dumpstats(int severity
)
1634 time_t now
= time(NULL
);
1636 int rbuf_cap
, wbuf_cap
, rbuf_len
, wbuf_len
;
1638 log(severity
, LD_GENERAL
, "Dumping stats:");
1640 SMARTLIST_FOREACH(connection_array
, connection_t
*, conn
,
1642 int i
= conn_sl_idx
;
1643 log(severity
, LD_GENERAL
,
1644 "Conn %d (socket %d) type %d (%s), state %d (%s), created %d secs ago",
1645 i
, conn
->s
, conn
->type
, conn_type_to_string(conn
->type
),
1646 conn
->state
, conn_state_to_string(conn
->type
, conn
->state
),
1647 (int)(now
- conn
->timestamp_created
));
1648 if (!connection_is_listener(conn
)) {
1649 log(severity
,LD_GENERAL
,
1650 "Conn %d is to %s:%d.", i
,
1651 safe_str(conn
->address
), conn
->port
);
1652 log(severity
,LD_GENERAL
,
1653 "Conn %d: %d bytes waiting on inbuf (len %d, last read %d secs ago)",
1655 (int)buf_datalen(conn
->inbuf
),
1656 (int)buf_allocation(conn
->inbuf
),
1657 (int)(now
- conn
->timestamp_lastread
));
1658 log(severity
,LD_GENERAL
,
1659 "Conn %d: %d bytes waiting on outbuf "
1660 "(len %d, last written %d secs ago)",i
,
1661 (int)buf_datalen(conn
->outbuf
),
1662 (int)buf_allocation(conn
->outbuf
),
1663 (int)(now
- conn
->timestamp_lastwritten
));
1664 if (conn
->type
== CONN_TYPE_OR
) {
1665 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
1667 tor_tls_get_buffer_sizes(or_conn
->tls
, &rbuf_cap
, &rbuf_len
,
1668 &wbuf_cap
, &wbuf_len
);
1669 log(severity
, LD_GENERAL
,
1670 "Conn %d: %d/%d bytes used on openssl read buffer; "
1671 "%d/%d bytes used on write buffer.",
1672 i
, rbuf_len
, rbuf_cap
, wbuf_len
, wbuf_cap
);
1676 circuit_dump_by_conn(conn
, severity
); /* dump info about all the circuits
1677 * using this conn */
1679 log(severity
, LD_NET
,
1680 "Cells processed: "U64_FORMAT
" padding\n"
1681 " "U64_FORMAT
" create\n"
1682 " "U64_FORMAT
" created\n"
1683 " "U64_FORMAT
" relay\n"
1684 " ("U64_FORMAT
" relayed)\n"
1685 " ("U64_FORMAT
" delivered)\n"
1686 " "U64_FORMAT
" destroy",
1687 U64_PRINTF_ARG(stats_n_padding_cells_processed
),
1688 U64_PRINTF_ARG(stats_n_create_cells_processed
),
1689 U64_PRINTF_ARG(stats_n_created_cells_processed
),
1690 U64_PRINTF_ARG(stats_n_relay_cells_processed
),
1691 U64_PRINTF_ARG(stats_n_relay_cells_relayed
),
1692 U64_PRINTF_ARG(stats_n_relay_cells_delivered
),
1693 U64_PRINTF_ARG(stats_n_destroy_cells_processed
));
1694 if (stats_n_data_cells_packaged
)
1695 log(severity
,LD_NET
,"Average packaged cell fullness: %2.3f%%",
1696 100*(U64_TO_DBL(stats_n_data_bytes_packaged
) /
1697 U64_TO_DBL(stats_n_data_cells_packaged
*RELAY_PAYLOAD_SIZE
)) );
1698 if (stats_n_data_cells_received
)
1699 log(severity
,LD_NET
,"Average delivered cell fullness: %2.3f%%",
1700 100*(U64_TO_DBL(stats_n_data_bytes_received
) /
1701 U64_TO_DBL(stats_n_data_cells_received
*RELAY_PAYLOAD_SIZE
)) );
1703 if (now
- time_of_process_start
>= 0)
1704 elapsed
= now
- time_of_process_start
;
1709 log(severity
, LD_NET
,
1710 "Average bandwidth: "U64_FORMAT
"/%d = %d bytes/sec reading",
1711 U64_PRINTF_ARG(stats_n_bytes_read
),
1713 (int) (stats_n_bytes_read
/elapsed
));
1714 log(severity
, LD_NET
,
1715 "Average bandwidth: "U64_FORMAT
"/%d = %d bytes/sec writing",
1716 U64_PRINTF_ARG(stats_n_bytes_written
),
1718 (int) (stats_n_bytes_written
/elapsed
));
1721 log(severity
, LD_NET
, "--------------- Dumping memory information:");
1722 dumpmemusage(severity
);
1724 rep_hist_dump_stats(now
,severity
);
1725 rend_service_dump_stats(severity
);
1726 dump_pk_ops(severity
);
1727 dump_distinct_digest_count(severity
);
1730 /** Called by exit() as we shut down the process.
1735 /* NOTE: If we ever daemonize, this gets called immediately. That's
1736 * okay for now, because we only use this on Windows. */
1742 /** Set up the signal handlers for either parent or child. */
1744 handle_signals(int is_parent
)
1746 #ifndef MS_WINDOWS /* do signal stuff only on unix */
1748 static int signals
[] = {
1749 SIGINT
, /* do a controlled slow shutdown */
1750 SIGTERM
, /* to terminate now */
1751 SIGPIPE
, /* otherwise sigpipe kills us */
1752 SIGUSR1
, /* dump stats */
1753 SIGUSR2
, /* go to loglevel debug */
1754 SIGHUP
, /* to reload config, retry conns, etc */
1756 SIGXFSZ
, /* handle file-too-big resource exhaustion */
1758 SIGCHLD
, /* handle dns/cpu workers that exit */
1760 static struct event signal_events
[16]; /* bigger than it has to be. */
1762 for (i
= 0; signals
[i
] >= 0; ++i
) {
1763 signal_set(&signal_events
[i
], signals
[i
], signal_callback
,
1764 (void*)(uintptr_t)signals
[i
]);
1765 if (signal_add(&signal_events
[i
], NULL
))
1766 log_warn(LD_BUG
, "Error from libevent when adding event for signal %d",
1770 struct sigaction action
;
1771 action
.sa_flags
= 0;
1772 sigemptyset(&action
.sa_mask
);
1773 action
.sa_handler
= SIG_IGN
;
1774 sigaction(SIGINT
, &action
, NULL
);
1775 sigaction(SIGTERM
, &action
, NULL
);
1776 sigaction(SIGPIPE
, &action
, NULL
);
1777 sigaction(SIGUSR1
, &action
, NULL
);
1778 sigaction(SIGUSR2
, &action
, NULL
);
1779 sigaction(SIGHUP
, &action
, NULL
);
1781 sigaction(SIGXFSZ
, &action
, NULL
);
1784 #else /* MS windows */
1786 #endif /* signal stuff */
1789 /** Main entry point for the Tor command-line client.
1792 tor_init(int argc
, char *argv
[])
1796 time_of_process_start
= time(NULL
);
1797 if (!connection_array
)
1798 connection_array
= smartlist_create();
1799 if (!closeable_connection_lst
)
1800 closeable_connection_lst
= smartlist_create();
1801 if (!active_linked_connection_lst
)
1802 active_linked_connection_lst
= smartlist_create();
1803 /* Have the log set up with our application name. */
1804 tor_snprintf(buf
, sizeof(buf
), "Tor %s", get_version());
1805 log_set_application_name(buf
);
1806 /* Initialize the history structures. */
1808 /* Initialize the service cache. */
1810 addressmap_init(); /* Init the client dns cache. Do it always, since it's
1813 /* We search for the "quiet" option first, since it decides whether we
1814 * will log anything at all to the command line. */
1815 for (i
=1;i
<argc
;++i
) {
1816 if (!strcmp(argv
[i
], "--hush"))
1818 if (!strcmp(argv
[i
], "--quiet"))
1821 /* give it somewhere to log to initially */
1824 /* no initial logging */
1827 add_temp_log(LOG_WARN
);
1830 add_temp_log(LOG_NOTICE
);
1833 log(LOG_NOTICE
, LD_GENERAL
, "Tor v%s. This is experimental software. "
1834 "Do not rely on it for strong anonymity. (Running on %s)",get_version(),
1837 if (network_init()<0) {
1838 log_err(LD_BUG
,"Error initializing network; exiting.");
1841 atexit(exit_function
);
1843 if (options_init_from_torrc(argc
,argv
) < 0) {
1844 log_err(LD_CONFIG
,"Reading config failed--see warnings above.");
1850 log_warn(LD_GENERAL
,"You are running Tor as root. You don't need to, "
1851 "and you probably shouldn't.");
1854 crypto_global_init(get_options()->HardwareAccel
);
1855 if (crypto_seed_rng(1)) {
1856 log_err(LD_BUG
, "Unable to seed random number generator. Exiting.");
1863 static tor_lockfile_t
*lockfile
= NULL
;
1865 /** Try to grab the lock file described in <b>options</b>, if we do not
1866 * already have it. If <b>err_if_locked</b> is true, warn if somebody else is
1867 * holding the lock, and exit if we can't get it after waiting. Otherwise,
1868 * return -1 if we can't get the lockfile. Return 0 on success.
1871 try_locking(or_options_t
*options
, int err_if_locked
)
1876 char *fname
= options_get_datadir_fname2_suffix(options
, "lock",NULL
,NULL
);
1877 int already_locked
= 0;
1878 tor_lockfile_t
*lf
= tor_lockfile_lock(fname
, 0, &already_locked
);
1881 if (err_if_locked
&& already_locked
) {
1883 log_warn(LD_GENERAL
, "It looks like another Tor process is running "
1884 "with the same data directory. Waiting 5 seconds to see "
1885 "if it goes away.");
1891 r
= try_locking(options
, 0);
1893 log_err(LD_GENERAL
, "No, it's still there. Exiting.");
1905 /* DOCDOC have_lockfile */
1909 return lockfile
!= NULL
;
1912 /* DOCDOC release_lockfile */
1914 release_lockfile(void)
1917 tor_lockfile_unlock(lockfile
);
1922 /** Free all memory that we might have allocated somewhere.
1923 * If <b>postfork</b>, we are a worker process and we want to free
1924 * only the parts of memory that we won't touch. If !<b>postfork</b>,
1925 * Tor is shutting down and we should free everything.
1927 * Helps us find the real leaks with dmalloc and the like. Also valgrind
1928 * should then report 0 reachable in its leak report (in an ideal world --
1929 * in practice libevent, ssl, libc etc never quite free everything). */
1931 tor_free_all(int postfork
)
1938 routerlist_free_all();
1939 networkstatus_free_all();
1940 addressmap_free_all();
1942 rend_service_free_all();
1943 rend_cache_free_all();
1944 rend_service_authorization_free_all();
1945 rep_hist_free_all();
1946 hs_usage_free_all();
1948 clear_pending_onions();
1950 entry_guards_free_all();
1951 connection_free_all();
1952 buf_shrink_freelists(1);
1953 memarea_clear_freelist();
1957 policies_free_all();
1963 /* stuff in main.c */
1964 if (connection_array
)
1965 smartlist_free(connection_array
);
1966 if (closeable_connection_lst
)
1967 smartlist_free(closeable_connection_lst
);
1968 if (active_linked_connection_lst
)
1969 smartlist_free(active_linked_connection_lst
);
1970 tor_free(timeout_event
);
1974 /* Stuff in util.c and address.c*/
1977 esc_router_info(NULL
);
1978 logs_free_all(); /* free log strings. do this last so logs keep working. */
1982 /** Do whatever cleanup is necessary before shutting Tor down. */
1986 or_options_t
*options
= get_options();
1987 /* Remove our pid file. We don't care if there was an error when we
1988 * unlink, nothing we could do about it anyways. */
1989 if (options
->command
== CMD_RUN_TOR
) {
1990 if (options
->PidFile
)
1991 unlink(options
->PidFile
);
1992 if (accounting_is_enabled(options
))
1993 accounting_record_bandwidth_usage(time(NULL
), get_or_state());
1994 or_state_mark_dirty(get_or_state(), 0); /* force an immediate save. */
1995 or_state_save(time(NULL
));
1996 if (authdir_mode_tests_reachability(options
))
1997 rep_hist_record_mtbf_data();
2000 dmalloc_log_stats();
2002 tor_free_all(0); /* We could move tor_free_all back into the ifdef below
2003 later, if it makes shutdown unacceptably slow. But for
2004 now, leave it here: it's helped us catch bugs in the
2006 crypto_global_cleanup();
2008 dmalloc_log_unfreed();
2013 /** Read/create keys as needed, and echo our fingerprint to stdout. */
2015 do_list_fingerprint(void)
2017 char buf
[FINGERPRINT_LEN
+1];
2019 const char *nickname
= get_options()->Nickname
;
2020 if (!server_mode(get_options())) {
2022 "Clients don't have long-term identity keys. Exiting.\n");
2025 tor_assert(nickname
);
2026 if (init_keys() < 0) {
2027 log_err(LD_BUG
,"Error initializing keys; can't display fingerprint");
2030 if (!(k
= get_identity_key())) {
2031 log_err(LD_GENERAL
,"Error: missing identity key.");
2034 if (crypto_pk_get_fingerprint(k
, buf
, 1)<0) {
2035 log_err(LD_BUG
, "Error computing fingerprint");
2038 printf("%s %s\n", nickname
, buf
);
2042 /** Entry point for password hashing: take the desired password from
2043 * the command line, and print its salted hash to stdout. **/
2045 do_hash_password(void)
2049 char key
[S2K_SPECIFIER_LEN
+DIGEST_LEN
];
2051 crypto_rand(key
, S2K_SPECIFIER_LEN
-1);
2052 key
[S2K_SPECIFIER_LEN
-1] = (uint8_t)96; /* Hash 64 K of data. */
2053 secret_to_key(key
+S2K_SPECIFIER_LEN
, DIGEST_LEN
,
2054 get_options()->command_arg
, strlen(get_options()->command_arg
),
2056 base16_encode(output
, sizeof(output
), key
, sizeof(key
));
2057 printf("16:%s\n",output
);
2060 /** Main entry point for the Tor process. Called from main(). */
2061 /* This function is distinct from main() only so we can link main.c into
2062 * the unittest binary without conflicting with the unittests' main. */
2064 tor_main(int argc
, char *argv
[])
2067 update_approx_time(time(NULL
));
2072 /* Instruct OpenSSL to use our internal wrappers for malloc,
2073 realloc and free. */
2074 int r
= CRYPTO_set_mem_ex_functions(_tor_malloc
, _tor_realloc
, _tor_free
);
2081 result
= nt_service_parse_options(argc
, argv
, &done
);
2082 if (done
) return result
;
2085 if (tor_init(argc
, argv
)<0)
2087 switch (get_options()->command
) {
2090 nt_service_set_state(SERVICE_RUNNING
);
2092 result
= do_main_loop();
2094 case CMD_LIST_FINGERPRINT
:
2095 result
= do_list_fingerprint();
2097 case CMD_HASH_PASSWORD
:
2101 case CMD_VERIFY_CONFIG
:
2102 printf("Configuration was valid\n");
2105 case CMD_RUN_UNITTESTS
: /* only set by test.c */
2107 log_warn(LD_BUG
,"Illegal command number %d: internal error.",
2108 get_options()->command
);