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) 2007-2010, The Tor Project, Inc. */
5 /* See LICENSE for licensing information */
9 * \brief Toplevel module. Handles signals, multiplexes between
10 * connections, implements main loop, and drives scheduled events.
17 #include <openssl/crypto.h>
21 #ifdef HAVE_EVENT2_EVENT_H
22 #include <event2/event.h>
27 void evdns_shutdown(int);
29 /********* PROTOTYPES **********/
31 static void dumpmemusage(int severity
);
32 static void dumpstats(int severity
); /* log stats */
33 static void conn_read_callback(int fd
, short event
, void *_conn
);
34 static void conn_write_callback(int fd
, short event
, void *_conn
);
35 static void signal_callback(int fd
, short events
, void *arg
);
36 static void second_elapsed_callback(int fd
, short event
, void *args
);
37 static int conn_close_if_marked(int i
);
38 static void connection_start_reading_from_linked_conn(connection_t
*conn
);
39 static int connection_should_read_from_linked_conn(connection_t
*conn
);
41 /********* START VARIABLES **********/
43 int global_read_bucket
; /**< Max number of bytes I can read this second. */
44 int global_write_bucket
; /**< Max number of bytes I can write this second. */
46 /** Max number of relayed (bandwidth class 1) bytes I can read this second. */
47 int global_relayed_read_bucket
;
48 /** Max number of relayed (bandwidth class 1) bytes I can write this second. */
49 int global_relayed_write_bucket
;
51 /** What was the read bucket before the last second_elapsed_callback() call?
52 * (used to determine how many bytes we've read). */
53 static int stats_prev_global_read_bucket
;
54 /** What was the write bucket before the last second_elapsed_callback() call?
55 * (used to determine how many bytes we've written). */
56 static int stats_prev_global_write_bucket
;
57 /* XXX we might want to keep stats about global_relayed_*_bucket too. Or not.*/
58 /** How many bytes have we read since we started the process? */
59 static uint64_t stats_n_bytes_read
= 0;
60 /** How many bytes have we written since we started the process? */
61 static uint64_t stats_n_bytes_written
= 0;
62 /** What time did this process start up? */
63 time_t time_of_process_start
= 0;
64 /** How many seconds have we been running? */
65 long stats_n_seconds_working
= 0;
66 /** When do we next launch DNS wildcarding checks? */
67 static time_t time_to_check_for_correct_dns
= 0;
69 /** How often will we honor SIGNEWNYM requests? */
70 #define MAX_SIGNEWNYM_RATE 10
71 /** When did we last process a SIGNEWNYM request? */
72 static time_t time_of_last_signewnym
= 0;
73 /** Is there a signewnym request we're currently waiting to handle? */
74 static int signewnym_is_pending
= 0;
76 /** Smartlist of all open connections. */
77 static smartlist_t
*connection_array
= NULL
;
78 /** List of connections that have been marked for close and need to be freed
79 * and removed from connection_array. */
80 static smartlist_t
*closeable_connection_lst
= NULL
;
81 /** List of linked connections that are currently reading data into their
82 * inbuf from their partner's outbuf. */
83 static smartlist_t
*active_linked_connection_lst
= NULL
;
84 /** Flag: Set to true iff we entered the current libevent main loop via
85 * <b>loop_once</b>. If so, there's no need to trigger a loopexit in order
86 * to handle linked connections. */
87 static int called_loop_once
= 0;
89 /** We set this to 1 when we've opened a circuit, so we can print a log
90 * entry to inform the user that Tor is working. */
91 int has_completed_circuit
=0;
93 /** How often do we check for router descriptors that we should download
94 * when we have too little directory info? */
95 #define GREEDY_DESCRIPTOR_RETRY_INTERVAL (10)
96 /** How often do we check for router descriptors that we should download
97 * when we have enough directory info? */
98 #define LAZY_DESCRIPTOR_RETRY_INTERVAL (60)
99 /** How often do we 'forgive' undownloadable router descriptors and attempt
100 * to download them again? */
101 #define DESCRIPTOR_FAILURE_RESET_INTERVAL (60*60)
102 /** How long do we let a directory connection stall before expiring it? */
103 #define DIR_CONN_MAX_STALL (5*60)
105 /** How long do we let OR connections handshake before we decide that
106 * they are obsolete? */
107 #define TLS_HANDSHAKE_TIMEOUT (60)
109 /********* END VARIABLES ************/
111 /****************************************************************************
113 * This section contains accessors and other methods on the connection_array
114 * variables (which are global within this file and unavailable outside it).
116 ****************************************************************************/
118 /** Add <b>conn</b> to the array of connections that we can poll on. The
119 * connection's socket must be set; the connection starts out
120 * non-reading and non-writing.
123 connection_add(connection_t
*conn
)
126 tor_assert(conn
->s
>= 0 ||
128 (conn
->type
== CONN_TYPE_AP
&&
129 TO_EDGE_CONN(conn
)->is_dns_request
));
131 tor_assert(conn
->conn_array_index
== -1); /* can only connection_add once */
132 conn
->conn_array_index
= smartlist_len(connection_array
);
133 smartlist_add(connection_array
, conn
);
135 if (conn
->s
>= 0 || conn
->linked
) {
136 conn
->read_event
= tor_event_new(tor_libevent_get_base(),
137 conn
->s
, EV_READ
|EV_PERSIST
, conn_read_callback
, conn
);
138 conn
->write_event
= tor_event_new(tor_libevent_get_base(),
139 conn
->s
, EV_WRITE
|EV_PERSIST
, conn_write_callback
, conn
);
142 log_debug(LD_NET
,"new conn type %s, socket %d, address %s, n_conns %d.",
143 conn_type_to_string(conn
->type
), conn
->s
, conn
->address
,
144 smartlist_len(connection_array
));
149 /** Tell libevent that we don't care about <b>conn</b> any more. */
151 connection_unregister_events(connection_t
*conn
)
153 if (conn
->read_event
) {
154 if (event_del(conn
->read_event
))
155 log_warn(LD_BUG
, "Error removing read event for %d", conn
->s
);
156 tor_free(conn
->read_event
);
158 if (conn
->write_event
) {
159 if (event_del(conn
->write_event
))
160 log_warn(LD_BUG
, "Error removing write event for %d", conn
->s
);
161 tor_free(conn
->write_event
);
163 if (conn
->dns_server_port
) {
164 dnsserv_close_listener(conn
);
168 /** Remove the connection from the global list, and remove the
169 * corresponding poll entry. Calling this function will shift the last
170 * connection (if any) into the position occupied by conn.
173 connection_remove(connection_t
*conn
)
180 log_debug(LD_NET
,"removing socket %d (type %s), n_conns now %d",
181 conn
->s
, conn_type_to_string(conn
->type
),
182 smartlist_len(connection_array
));
184 tor_assert(conn
->conn_array_index
>= 0);
185 current_index
= conn
->conn_array_index
;
186 connection_unregister_events(conn
); /* This is redundant, but cheap. */
187 if (current_index
== smartlist_len(connection_array
)-1) { /* at the end */
188 smartlist_del(connection_array
, current_index
);
192 /* replace this one with the one at the end */
193 smartlist_del(connection_array
, current_index
);
194 tmp
= smartlist_get(connection_array
, current_index
);
195 tmp
->conn_array_index
= current_index
;
200 /** If <b>conn</b> is an edge conn, remove it from the list
201 * of conn's on this circuit. If it's not on an edge,
202 * flush and send destroys for all circuits on this conn.
204 * Remove it from connection_array (if applicable) and
205 * from closeable_connection_list.
210 connection_unlink(connection_t
*conn
)
212 connection_about_to_close_connection(conn
);
213 if (conn
->conn_array_index
>= 0) {
214 connection_remove(conn
);
216 if (conn
->linked_conn
) {
217 conn
->linked_conn
->linked_conn
= NULL
;
218 if (! conn
->linked_conn
->marked_for_close
&&
219 conn
->linked_conn
->reading_from_linked_conn
)
220 connection_start_reading(conn
->linked_conn
);
221 conn
->linked_conn
= NULL
;
223 smartlist_remove(closeable_connection_lst
, conn
);
224 smartlist_remove(active_linked_connection_lst
, conn
);
225 if (conn
->type
== CONN_TYPE_EXIT
) {
226 assert_connection_edge_not_dns_pending(TO_EDGE_CONN(conn
));
228 if (conn
->type
== CONN_TYPE_OR
) {
229 if (!tor_digest_is_zero(TO_OR_CONN(conn
)->identity_digest
))
230 connection_or_remove_from_identity_map(TO_OR_CONN(conn
));
232 connection_free(conn
);
235 /** Schedule <b>conn</b> to be closed. **/
237 add_connection_to_closeable_list(connection_t
*conn
)
239 tor_assert(!smartlist_isin(closeable_connection_lst
, conn
));
240 tor_assert(conn
->marked_for_close
);
241 assert_connection_ok(conn
, time(NULL
));
242 smartlist_add(closeable_connection_lst
, conn
);
245 /** Return 1 if conn is on the closeable list, else return 0. */
247 connection_is_on_closeable_list(connection_t
*conn
)
249 return smartlist_isin(closeable_connection_lst
, conn
);
252 /** Return true iff conn is in the current poll array. */
254 connection_in_array(connection_t
*conn
)
256 return smartlist_isin(connection_array
, conn
);
259 /** Set <b>*array</b> to an array of all connections, and <b>*n</b>
260 * to the length of the array. <b>*array</b> and <b>*n</b> must not
264 get_connection_array(void)
266 if (!connection_array
)
267 connection_array
= smartlist_create();
268 return connection_array
;
271 /** Set the event mask on <b>conn</b> to <b>events</b>. (The event
272 * mask is a bitmask whose bits are READ_EVENT and WRITE_EVENT)
275 connection_watch_events(connection_t
*conn
, watchable_events_t events
)
277 if (events
& READ_EVENT
)
278 connection_start_reading(conn
);
280 connection_stop_reading(conn
);
282 if (events
& WRITE_EVENT
)
283 connection_start_writing(conn
);
285 connection_stop_writing(conn
);
288 /** Return true iff <b>conn</b> is listening for read events. */
290 connection_is_reading(connection_t
*conn
)
294 return conn
->reading_from_linked_conn
||
295 (conn
->read_event
&& event_pending(conn
->read_event
, EV_READ
, NULL
));
298 /** Tell the main loop to stop notifying <b>conn</b> of any read events. */
300 connection_stop_reading(connection_t
*conn
)
303 tor_assert(conn
->read_event
);
306 conn
->reading_from_linked_conn
= 0;
307 connection_stop_reading_from_linked_conn(conn
);
309 if (event_del(conn
->read_event
))
310 log_warn(LD_NET
, "Error from libevent setting read event state for %d "
313 tor_socket_strerror(tor_socket_errno(conn
->s
)));
317 /** Tell the main loop to start notifying <b>conn</b> of any read events. */
319 connection_start_reading(connection_t
*conn
)
322 tor_assert(conn
->read_event
);
325 conn
->reading_from_linked_conn
= 1;
326 if (connection_should_read_from_linked_conn(conn
))
327 connection_start_reading_from_linked_conn(conn
);
329 if (event_add(conn
->read_event
, NULL
))
330 log_warn(LD_NET
, "Error from libevent setting read event state for %d "
333 tor_socket_strerror(tor_socket_errno(conn
->s
)));
337 /** Return true iff <b>conn</b> is listening for write events. */
339 connection_is_writing(connection_t
*conn
)
343 return conn
->writing_to_linked_conn
||
344 (conn
->write_event
&& event_pending(conn
->write_event
, EV_WRITE
, NULL
));
347 /** Tell the main loop to stop notifying <b>conn</b> of any write events. */
349 connection_stop_writing(connection_t
*conn
)
352 tor_assert(conn
->write_event
);
355 conn
->writing_to_linked_conn
= 0;
356 if (conn
->linked_conn
)
357 connection_stop_reading_from_linked_conn(conn
->linked_conn
);
359 if (event_del(conn
->write_event
))
360 log_warn(LD_NET
, "Error from libevent setting write event state for %d "
363 tor_socket_strerror(tor_socket_errno(conn
->s
)));
367 /** Tell the main loop to start notifying <b>conn</b> of any write events. */
369 connection_start_writing(connection_t
*conn
)
372 tor_assert(conn
->write_event
);
375 conn
->writing_to_linked_conn
= 1;
376 if (conn
->linked_conn
&&
377 connection_should_read_from_linked_conn(conn
->linked_conn
))
378 connection_start_reading_from_linked_conn(conn
->linked_conn
);
380 if (event_add(conn
->write_event
, NULL
))
381 log_warn(LD_NET
, "Error from libevent setting write event state for %d "
384 tor_socket_strerror(tor_socket_errno(conn
->s
)));
388 /** Return true iff <b>conn</b> is linked conn, and reading from the conn
389 * linked to it would be good and feasible. (Reading is "feasible" if the
390 * other conn exists and has data in its outbuf, and is "good" if we have our
391 * reading_from_linked_conn flag set and the other conn has its
392 * writing_to_linked_conn flag set.)*/
394 connection_should_read_from_linked_conn(connection_t
*conn
)
396 if (conn
->linked
&& conn
->reading_from_linked_conn
) {
397 if (! conn
->linked_conn
||
398 (conn
->linked_conn
->writing_to_linked_conn
&&
399 buf_datalen(conn
->linked_conn
->outbuf
)))
405 /** Helper: Tell the main loop to begin reading bytes into <b>conn</b> from
406 * its linked connection, if it is not doing so already. Called by
407 * connection_start_reading and connection_start_writing as appropriate. */
409 connection_start_reading_from_linked_conn(connection_t
*conn
)
412 tor_assert(conn
->linked
== 1);
414 if (!conn
->active_on_link
) {
415 conn
->active_on_link
= 1;
416 smartlist_add(active_linked_connection_lst
, conn
);
417 if (!called_loop_once
) {
418 /* This is the first event on the list; we won't be in LOOP_ONCE mode,
419 * so we need to make sure that the event_base_loop() actually exits at
420 * the end of its run through the current connections and lets us
421 * activate read events for linked connections. */
422 struct timeval tv
= { 0, 0 };
423 tor_event_base_loopexit(tor_libevent_get_base(), &tv
);
426 tor_assert(smartlist_isin(active_linked_connection_lst
, conn
));
430 /** Tell the main loop to stop reading bytes into <b>conn</b> from its linked
431 * connection, if is currently doing so. Called by connection_stop_reading,
432 * connection_stop_writing, and connection_read. */
434 connection_stop_reading_from_linked_conn(connection_t
*conn
)
437 tor_assert(conn
->linked
== 1);
439 if (conn
->active_on_link
) {
440 conn
->active_on_link
= 0;
441 /* FFFF We could keep an index here so we can smartlist_del
442 * cleanly. On the other hand, this doesn't show up on profiles,
443 * so let's leave it alone for now. */
444 smartlist_remove(active_linked_connection_lst
, conn
);
446 tor_assert(!smartlist_isin(active_linked_connection_lst
, conn
));
450 /** Close all connections that have been scheduled to get closed. */
452 close_closeable_connections(void)
455 for (i
= 0; i
< smartlist_len(closeable_connection_lst
); ) {
456 connection_t
*conn
= smartlist_get(closeable_connection_lst
, i
);
457 if (conn
->conn_array_index
< 0) {
458 connection_unlink(conn
); /* blow it away right now */
460 if (!conn_close_if_marked(conn
->conn_array_index
))
466 /** Libevent callback: this gets invoked when (connection_t*)<b>conn</b> has
467 * some data to read. */
469 conn_read_callback(int fd
, short event
, void *_conn
)
471 connection_t
*conn
= _conn
;
475 log_debug(LD_NET
,"socket %d wants to read.",conn
->s
);
477 /* assert_connection_ok(conn, time(NULL)); */
479 if (connection_handle_read(conn
) < 0) {
480 if (!conn
->marked_for_close
) {
482 log_warn(LD_BUG
,"Unhandled error on read for %s connection "
484 conn_type_to_string(conn
->type
), conn
->s
);
485 tor_fragile_assert();
487 if (CONN_IS_EDGE(conn
))
488 connection_edge_end_errno(TO_EDGE_CONN(conn
));
489 connection_mark_for_close(conn
);
492 assert_connection_ok(conn
, time(NULL
));
494 if (smartlist_len(closeable_connection_lst
))
495 close_closeable_connections();
498 /** Libevent callback: this gets invoked when (connection_t*)<b>conn</b> has
499 * some data to write. */
501 conn_write_callback(int fd
, short events
, void *_conn
)
503 connection_t
*conn
= _conn
;
507 LOG_FN_CONN(conn
, (LOG_DEBUG
, LD_NET
, "socket %d wants to write.",conn
->s
));
509 /* assert_connection_ok(conn, time(NULL)); */
511 if (connection_handle_write(conn
, 0) < 0) {
512 if (!conn
->marked_for_close
) {
513 /* this connection is broken. remove it. */
514 log_fn(LOG_WARN
,LD_BUG
,
515 "unhandled error on write for %s connection (fd %d); removing",
516 conn_type_to_string(conn
->type
), conn
->s
);
517 tor_fragile_assert();
518 if (CONN_IS_EDGE(conn
)) {
519 /* otherwise we cry wolf about duplicate close */
520 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
521 if (!edge_conn
->end_reason
)
522 edge_conn
->end_reason
= END_STREAM_REASON_INTERNAL
;
523 edge_conn
->edge_has_sent_end
= 1;
525 connection_close_immediate(conn
); /* So we don't try to flush. */
526 connection_mark_for_close(conn
);
529 assert_connection_ok(conn
, time(NULL
));
531 if (smartlist_len(closeable_connection_lst
))
532 close_closeable_connections();
535 /** If the connection at connection_array[i] is marked for close, then:
536 * - If it has data that it wants to flush, try to flush it.
537 * - If it _still_ has data to flush, and conn->hold_open_until_flushed is
538 * true, then leave the connection open and return.
539 * - Otherwise, remove the connection from connection_array and from
540 * all other lists, close it, and free it.
541 * Returns 1 if the connection was closed, 0 otherwise.
544 conn_close_if_marked(int i
)
550 conn
= smartlist_get(connection_array
, i
);
551 if (!conn
->marked_for_close
)
552 return 0; /* nothing to see here, move along */
554 assert_connection_ok(conn
, now
);
555 /* assert_all_pending_dns_resolves_ok(); */
557 log_debug(LD_NET
,"Cleaning up connection (fd %d).",conn
->s
);
558 if ((conn
->s
>= 0 || conn
->linked_conn
) && connection_wants_to_flush(conn
)) {
559 /* s == -1 means it's an incomplete edge connection, or that the socket
560 * has already been closed as unflushable. */
561 ssize_t sz
= connection_bucket_write_limit(conn
, now
);
562 if (!conn
->hold_open_until_flushed
)
564 "Conn (addr %s, fd %d, type %s, state %d) marked, but wants "
565 "to flush %d bytes. (Marked at %s:%d)",
566 escaped_safe_str_client(conn
->address
),
567 conn
->s
, conn_type_to_string(conn
->type
), conn
->state
,
568 (int)conn
->outbuf_flushlen
,
569 conn
->marked_for_close_file
, conn
->marked_for_close
);
570 if (conn
->linked_conn
) {
571 retval
= move_buf_to_buf(conn
->linked_conn
->inbuf
, conn
->outbuf
,
572 &conn
->outbuf_flushlen
);
574 /* The linked conn will notice that it has data when it notices that
576 connection_start_reading_from_linked_conn(conn
->linked_conn
);
578 log_debug(LD_GENERAL
, "Flushed last %d bytes from a linked conn; "
579 "%d left; flushlen %d; wants-to-flush==%d", retval
,
580 (int)buf_datalen(conn
->outbuf
),
581 (int)conn
->outbuf_flushlen
,
582 connection_wants_to_flush(conn
));
583 } else if (connection_speaks_cells(conn
)) {
584 if (conn
->state
== OR_CONN_STATE_OPEN
) {
585 retval
= flush_buf_tls(TO_OR_CONN(conn
)->tls
, conn
->outbuf
, sz
,
586 &conn
->outbuf_flushlen
);
588 retval
= -1; /* never flush non-open broken tls connections */
590 retval
= flush_buf(conn
->s
, conn
->outbuf
, sz
, &conn
->outbuf_flushlen
);
592 if (retval
>= 0 && /* Technically, we could survive things like
593 TLS_WANT_WRITE here. But don't bother for now. */
594 conn
->hold_open_until_flushed
&& connection_wants_to_flush(conn
)) {
596 LOG_FN_CONN(conn
, (LOG_INFO
,LD_NET
,
597 "Holding conn (fd %d) open for more flushing.",
599 conn
->timestamp_lastwritten
= now
; /* reset so we can flush more */
603 if (connection_wants_to_flush(conn
)) {
605 if (conn
->type
== CONN_TYPE_EXIT
||
606 (conn
->type
== CONN_TYPE_OR
&& server_mode(get_options())) ||
607 (conn
->type
== CONN_TYPE_DIR
&& conn
->purpose
== DIR_PURPOSE_SERVER
))
610 severity
= LOG_NOTICE
;
611 /* XXXX Maybe allow this to happen a certain amount per hour; it usually
613 log_fn(severity
, LD_NET
, "We stalled too much while trying to write %d "
614 "bytes to address %s. If this happens a lot, either "
615 "something is wrong with your network connection, or "
616 "something is wrong with theirs. "
617 "(fd %d, type %s, state %d, marked at %s:%d).",
618 (int)buf_datalen(conn
->outbuf
),
619 escaped_safe_str_client(conn
->address
),
620 conn
->s
, conn_type_to_string(conn
->type
), conn
->state
,
621 conn
->marked_for_close_file
,
622 conn
->marked_for_close
);
625 connection_unlink(conn
); /* unlink, remove, free */
629 /** We've just tried every dirserver we know about, and none of
630 * them were reachable. Assume the network is down. Change state
631 * so next time an application connection arrives we'll delay it
632 * and try another directory fetch. Kill off all the circuit_wait
633 * streams that are waiting now, since they will all timeout anyway.
636 directory_all_unreachable(time_t now
)
641 stats_n_seconds_working
=0; /* reset it */
643 while ((conn
= connection_get_by_type_state(CONN_TYPE_AP
,
644 AP_CONN_STATE_CIRCUIT_WAIT
))) {
645 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
647 "Is your network connection down? "
648 "Failing connection to '%s:%d'.",
649 safe_str_client(edge_conn
->socks_request
->address
),
650 edge_conn
->socks_request
->port
);
651 connection_mark_unattached_ap(edge_conn
,
652 END_STREAM_REASON_NET_UNREACHABLE
);
654 control_event_general_status(LOG_ERR
, "DIR_ALL_UNREACHABLE");
657 /** This function is called whenever we successfully pull down some new
658 * network statuses or server descriptors. */
660 directory_info_has_arrived(time_t now
, int from_cache
)
662 or_options_t
*options
= get_options();
664 if (!router_have_minimum_dir_info()) {
665 int quiet
= directory_too_idle_to_fetch_descriptors(options
, now
);
666 log(quiet
? LOG_INFO
: LOG_NOTICE
, LD_DIR
,
667 "I learned some more directory information, but not enough to "
668 "build a circuit: %s", get_dir_info_status_string());
669 update_router_descriptor_downloads(now
);
672 if (directory_fetches_from_authorities(options
))
673 update_router_descriptor_downloads(now
);
675 /* if we have enough dir info, then update our guard status with
676 * whatever we just learned. */
677 entry_guards_compute_status();
678 /* Don't even bother trying to get extrainfo until the rest of our
679 * directory info is up-to-date */
680 if (options
->DownloadExtraInfo
)
681 update_extrainfo_downloads(now
);
684 if (server_mode(options
) && !we_are_hibernating() && !from_cache
&&
685 (has_completed_circuit
|| !any_predicted_circuits(now
)))
686 consider_testing_reachability(1, 1);
689 /** Perform regular maintenance tasks for a single connection. This
690 * function gets run once per second per connection by run_scheduled_events.
693 run_connection_housekeeping(int i
, time_t now
)
696 connection_t
*conn
= smartlist_get(connection_array
, i
);
697 or_options_t
*options
= get_options();
698 or_connection_t
*or_conn
;
700 if (conn
->outbuf
&& !buf_datalen(conn
->outbuf
) && conn
->type
== CONN_TYPE_OR
)
701 TO_OR_CONN(conn
)->timestamp_lastempty
= now
;
703 if (conn
->marked_for_close
) {
704 /* nothing to do here */
708 /* Expire any directory connections that haven't been active (sent
709 * if a server or received if a client) for 5 min */
710 if (conn
->type
== CONN_TYPE_DIR
&&
711 ((DIR_CONN_IS_SERVER(conn
) &&
712 conn
->timestamp_lastwritten
+ DIR_CONN_MAX_STALL
< now
) ||
713 (!DIR_CONN_IS_SERVER(conn
) &&
714 conn
->timestamp_lastread
+ DIR_CONN_MAX_STALL
< now
))) {
715 log_info(LD_DIR
,"Expiring wedged directory conn (fd %d, purpose %d)",
716 conn
->s
, conn
->purpose
);
717 /* This check is temporary; it's to let us know whether we should consider
718 * parsing partial serverdesc responses. */
719 if (conn
->purpose
== DIR_PURPOSE_FETCH_SERVERDESC
&&
720 buf_datalen(conn
->inbuf
)>=1024) {
721 log_info(LD_DIR
,"Trying to extract information from wedged server desc "
723 connection_dir_reached_eof(TO_DIR_CONN(conn
));
725 connection_mark_for_close(conn
);
730 if (!connection_speaks_cells(conn
))
731 return; /* we're all done here, the rest is just for OR conns */
733 or_conn
= TO_OR_CONN(conn
);
734 tor_assert(conn
->outbuf
);
736 if (or_conn
->is_bad_for_new_circs
&& !or_conn
->n_circuits
) {
737 /* It's bad for new circuits, and has no unmarked circuits on it:
740 "Expiring non-used OR connection to fd %d (%s:%d) [Too old].",
741 conn
->s
, conn
->address
, conn
->port
);
742 if (conn
->state
== OR_CONN_STATE_CONNECTING
)
743 connection_or_connect_failed(TO_OR_CONN(conn
),
744 END_OR_CONN_REASON_TIMEOUT
,
745 "Tor gave up on the connection");
746 connection_mark_for_close(conn
);
747 conn
->hold_open_until_flushed
= 1;
751 /* If we haven't written to an OR connection for a while, then either nuke
752 the connection or send a keepalive, depending. */
753 if (now
>= conn
->timestamp_lastwritten
+ options
->KeepalivePeriod
) {
754 routerinfo_t
*router
= router_get_by_digest(or_conn
->identity_digest
);
755 int maxCircuitlessPeriod
= options
->MaxCircuitDirtiness
*3/2;
756 if (!connection_state_is_open(conn
)) {
757 /* We never managed to actually get this connection open and happy. */
758 log_info(LD_OR
,"Expiring non-open OR connection to fd %d (%s:%d).",
759 conn
->s
,conn
->address
, conn
->port
);
760 connection_mark_for_close(conn
);
761 conn
->hold_open_until_flushed
= 1;
762 } else if (we_are_hibernating() && !or_conn
->n_circuits
&&
763 !buf_datalen(conn
->outbuf
)) {
764 /* We're hibernating, there's no circuits, and nothing to flush.*/
765 log_info(LD_OR
,"Expiring non-used OR connection to fd %d (%s:%d) "
766 "[Hibernating or exiting].",
767 conn
->s
,conn
->address
, conn
->port
);
768 connection_mark_for_close(conn
);
769 conn
->hold_open_until_flushed
= 1;
770 } else if (!clique_mode(options
) && !or_conn
->n_circuits
&&
771 now
>= or_conn
->timestamp_last_added_nonpadding
+
772 maxCircuitlessPeriod
&&
773 (!router
|| !server_mode(options
) ||
774 !router_is_clique_mode(router
))) {
775 log_info(LD_OR
,"Expiring non-used OR connection to fd %d (%s:%d) "
776 "[Not in clique mode].",
777 conn
->s
,conn
->address
, conn
->port
);
778 connection_mark_for_close(conn
);
779 conn
->hold_open_until_flushed
= 1;
781 now
>= or_conn
->timestamp_lastempty
+ options
->KeepalivePeriod
*10 &&
782 now
>= conn
->timestamp_lastwritten
+ options
->KeepalivePeriod
*10) {
783 log_fn(LOG_PROTOCOL_WARN
,LD_PROTOCOL
,
784 "Expiring stuck OR connection to fd %d (%s:%d). (%d bytes to "
785 "flush; %d seconds since last write)",
786 conn
->s
, conn
->address
, conn
->port
,
787 (int)buf_datalen(conn
->outbuf
),
788 (int)(now
-conn
->timestamp_lastwritten
));
789 connection_mark_for_close(conn
);
790 } else if (!buf_datalen(conn
->outbuf
)) {
791 /* either in clique mode, or we've got a circuit. send a padding cell. */
792 log_fn(LOG_DEBUG
,LD_OR
,"Sending keepalive to (%s:%d)",
793 conn
->address
, conn
->port
);
794 memset(&cell
,0,sizeof(cell_t
));
795 cell
.command
= CELL_PADDING
;
796 connection_or_write_cell_to_buf(&cell
, or_conn
);
801 /** Honor a NEWNYM request: make future requests unlinkable to past
804 signewnym_impl(time_t now
)
806 circuit_expire_all_dirty_circs();
807 addressmap_clear_transient();
808 time_of_last_signewnym
= now
;
809 signewnym_is_pending
= 0;
812 /** Perform regular maintenance tasks. This function gets run once per
813 * second by second_elapsed_callback().
816 run_scheduled_events(time_t now
)
818 static time_t last_rotated_x509_certificate
= 0;
819 static time_t time_to_check_v3_certificate
= 0;
820 static time_t time_to_check_listeners
= 0;
821 static time_t time_to_check_descriptor
= 0;
822 static time_t time_to_check_ipaddress
= 0;
823 static time_t time_to_shrink_memory
= 0;
824 static time_t time_to_try_getting_descriptors
= 0;
825 static time_t time_to_reset_descriptor_failures
= 0;
826 static time_t time_to_add_entropy
= 0;
827 static time_t time_to_write_bridge_status_file
= 0;
828 static time_t time_to_downrate_stability
= 0;
829 static time_t time_to_save_stability
= 0;
830 static time_t time_to_clean_caches
= 0;
831 static time_t time_to_recheck_bandwidth
= 0;
832 static time_t time_to_check_for_expired_networkstatus
= 0;
833 static time_t time_to_write_stats_files
= 0;
834 static time_t time_to_write_bridge_stats
= 0;
835 static int should_init_bridge_stats
= 1;
836 static time_t time_to_retry_dns_init
= 0;
837 or_options_t
*options
= get_options();
841 /** 0. See if we've been asked to shut down and our timeout has
842 * expired; or if our bandwidth limits are exhausted and we
843 * should hibernate; or if it's time to wake up from hibernation.
845 consider_hibernation(now
);
847 /* 0b. If we've deferred a signewnym, make sure it gets handled
849 if (signewnym_is_pending
&&
850 time_of_last_signewnym
+ MAX_SIGNEWNYM_RATE
<= now
) {
851 log(LOG_INFO
, LD_CONTROL
, "Honoring delayed NEWNYM request");
855 /** 1a. Every MIN_ONION_KEY_LIFETIME seconds, rotate the onion keys,
856 * shut down and restart all cpuworkers, and update the directory if
859 if (server_mode(options
) &&
860 get_onion_key_set_at()+MIN_ONION_KEY_LIFETIME
< now
) {
861 log_info(LD_GENERAL
,"Rotating onion key.");
864 if (router_rebuild_descriptor(1)<0) {
865 log_info(LD_CONFIG
, "Couldn't rebuild router descriptor");
867 if (advertised_server_mode())
868 router_upload_dir_desc_to_dirservers(0);
871 if (time_to_try_getting_descriptors
< now
) {
872 update_router_descriptor_downloads(now
);
873 update_extrainfo_downloads(now
);
874 if (options
->UseBridges
)
875 fetch_bridge_descriptors(now
);
876 if (router_have_minimum_dir_info())
877 time_to_try_getting_descriptors
= now
+ LAZY_DESCRIPTOR_RETRY_INTERVAL
;
879 time_to_try_getting_descriptors
= now
+ GREEDY_DESCRIPTOR_RETRY_INTERVAL
;
882 if (time_to_reset_descriptor_failures
< now
) {
883 router_reset_descriptor_download_failures();
884 time_to_reset_descriptor_failures
=
885 now
+ DESCRIPTOR_FAILURE_RESET_INTERVAL
;
888 /** 1b. Every MAX_SSL_KEY_LIFETIME seconds, we change our TLS context. */
889 if (!last_rotated_x509_certificate
)
890 last_rotated_x509_certificate
= now
;
891 if (last_rotated_x509_certificate
+MAX_SSL_KEY_LIFETIME
< now
) {
892 log_info(LD_GENERAL
,"Rotating tls context.");
893 if (tor_tls_context_new(get_identity_key(), MAX_SSL_KEY_LIFETIME
) < 0) {
894 log_warn(LD_BUG
, "Error reinitializing TLS context");
895 /* XXX is it a bug here, that we just keep going? -RD */
897 last_rotated_x509_certificate
= now
;
898 /* We also make sure to rotate the TLS connections themselves if they've
899 * been up for too long -- but that's done via is_bad_for_new_circs in
900 * connection_run_housekeeping() above. */
903 if (time_to_add_entropy
< now
) {
904 if (time_to_add_entropy
) {
905 /* We already seeded once, so don't die on failure. */
908 /** How often do we add more entropy to OpenSSL's RNG pool? */
909 #define ENTROPY_INTERVAL (60*60)
910 time_to_add_entropy
= now
+ ENTROPY_INTERVAL
;
913 /** 1c. If we have to change the accounting interval or record
914 * bandwidth used in this accounting interval, do so. */
915 if (accounting_is_enabled(options
))
916 accounting_run_housekeeping(now
);
918 if (now
% 10 == 0 && (authdir_mode_tests_reachability(options
)) &&
919 !we_are_hibernating()) {
920 /* try to determine reachability of the other Tor relays */
921 dirserv_test_reachability(now
);
924 /** 1d. Periodically, we discount older stability information so that new
925 * stability info counts more, and save the stability information to disk as
927 if (time_to_downrate_stability
< now
)
928 time_to_downrate_stability
= rep_hist_downrate_old_runs(now
);
929 if (authdir_mode_tests_reachability(options
)) {
930 if (time_to_save_stability
< now
) {
931 if (time_to_save_stability
&& rep_hist_record_mtbf_data(now
, 1)<0) {
932 log_warn(LD_GENERAL
, "Couldn't store mtbf data.");
934 #define SAVE_STABILITY_INTERVAL (30*60)
935 time_to_save_stability
= now
+ SAVE_STABILITY_INTERVAL
;
939 /* 1e. Periodically, if we're a v3 authority, we check whether our cert is
940 * close to expiring and warn the admin if it is. */
941 if (time_to_check_v3_certificate
< now
) {
942 v3_authority_check_key_expiry();
943 #define CHECK_V3_CERTIFICATE_INTERVAL (5*60)
944 time_to_check_v3_certificate
= now
+ CHECK_V3_CERTIFICATE_INTERVAL
;
947 /* 1f. Check whether our networkstatus has expired.
949 if (time_to_check_for_expired_networkstatus
< now
) {
950 networkstatus_t
*ns
= networkstatus_get_latest_consensus();
951 /*XXXX RD: This value needs to be the same as REASONABLY_LIVE_TIME in
952 * networkstatus_get_reasonably_live_consensus(), but that value is way
953 * way too high. Arma: is the bridge issue there resolved yet? -NM */
954 #define NS_EXPIRY_SLOP (24*60*60)
955 if (ns
&& ns
->valid_until
< now
+NS_EXPIRY_SLOP
&&
956 router_have_minimum_dir_info()) {
957 router_dir_info_changed();
959 #define CHECK_EXPIRED_NS_INTERVAL (2*60)
960 time_to_check_for_expired_networkstatus
= now
+ CHECK_EXPIRED_NS_INTERVAL
;
963 /* 1g. Check whether we should write statistics to disk.
965 if (time_to_write_stats_files
>= 0 && time_to_write_stats_files
< now
) {
966 #define WRITE_STATS_INTERVAL (24*60*60)
967 if (options
->CellStatistics
|| options
->DirReqStatistics
||
968 options
->EntryStatistics
|| options
->ExitPortStatistics
) {
969 if (!time_to_write_stats_files
) {
970 /* Initialize stats. We're doing this here and not in options_act,
971 * so that we know exactly when the 24 hours interval ends. */
972 if (options
->CellStatistics
)
973 rep_hist_buffer_stats_init(now
);
974 if (options
->DirReqStatistics
)
975 geoip_dirreq_stats_init(now
);
976 if (options
->EntryStatistics
)
977 geoip_entry_stats_init(now
);
978 if (options
->ExitPortStatistics
)
979 rep_hist_exit_stats_init(now
);
980 log_notice(LD_CONFIG
, "Configured to measure statistics. Look for "
981 "the *-stats files that will first be written to the "
982 "data directory in %d hours from now.",
983 WRITE_STATS_INTERVAL
/ (60 * 60));
984 time_to_write_stats_files
= now
+ WRITE_STATS_INTERVAL
;
986 /* Write stats to disk. */
987 if (options
->CellStatistics
)
988 rep_hist_buffer_stats_write(time_to_write_stats_files
);
989 if (options
->DirReqStatistics
)
990 geoip_dirreq_stats_write(time_to_write_stats_files
);
991 if (options
->EntryStatistics
)
992 geoip_entry_stats_write(time_to_write_stats_files
);
993 if (options
->ExitPortStatistics
)
994 rep_hist_exit_stats_write(time_to_write_stats_files
);
995 time_to_write_stats_files
+= WRITE_STATS_INTERVAL
;
998 /* Never write stats to disk */
999 time_to_write_stats_files
= -1;
1003 /* 1h. Check whether we should write bridge statistics to disk.
1005 if (should_record_bridge_info(options
)) {
1006 if (time_to_write_bridge_stats
< now
) {
1007 if (should_init_bridge_stats
) {
1008 /* (Re-)initialize bridge statistics. */
1009 geoip_bridge_stats_init(now
);
1010 time_to_write_bridge_stats
= now
+ WRITE_STATS_INTERVAL
;
1011 should_init_bridge_stats
= 0;
1013 /* Possibly write bridge statistics to disk and ask when to write
1014 * them next time. */
1015 time_to_write_bridge_stats
= geoip_bridge_stats_write(
1016 time_to_write_bridge_stats
);
1019 } else if (!should_init_bridge_stats
) {
1020 /* Bridge mode was turned off. Ensure that stats are re-initialized
1021 * next time bridge mode is turned on. */
1022 should_init_bridge_stats
= 1;
1025 /* Remove old information from rephist and the rend cache. */
1026 if (time_to_clean_caches
< now
) {
1027 rep_history_clean(now
- options
->RephistTrackTime
);
1029 rend_cache_clean_v2_descs_as_dir();
1030 #define CLEAN_CACHES_INTERVAL (30*60)
1031 time_to_clean_caches
= now
+ CLEAN_CACHES_INTERVAL
;
1034 #define RETRY_DNS_INTERVAL (10*60)
1035 /* If we're a server and initializing dns failed, retry periodically. */
1036 if (time_to_retry_dns_init
< now
) {
1037 time_to_retry_dns_init
= now
+ RETRY_DNS_INTERVAL
;
1038 if (server_mode(options
) && has_dns_init_failed())
1042 /** 2. Periodically, we consider force-uploading our descriptor
1043 * (if we've passed our internal checks). */
1045 /** How often do we check whether part of our router info has changed in a way
1046 * that would require an upload? */
1047 #define CHECK_DESCRIPTOR_INTERVAL (60)
1048 /** How often do we (as a router) check whether our IP address has changed? */
1049 #define CHECK_IPADDRESS_INTERVAL (15*60)
1051 /* 2b. Once per minute, regenerate and upload the descriptor if the old
1052 * one is inaccurate. */
1053 if (time_to_check_descriptor
< now
) {
1054 static int dirport_reachability_count
= 0;
1055 time_to_check_descriptor
= now
+ CHECK_DESCRIPTOR_INTERVAL
;
1056 check_descriptor_bandwidth_changed(now
);
1057 if (time_to_check_ipaddress
< now
) {
1058 time_to_check_ipaddress
= now
+ CHECK_IPADDRESS_INTERVAL
;
1059 check_descriptor_ipaddress_changed(now
);
1061 /** If our router descriptor ever goes this long without being regenerated
1062 * because something changed, we force an immediate regenerate-and-upload. */
1063 #define FORCE_REGENERATE_DESCRIPTOR_INTERVAL (18*60*60)
1064 mark_my_descriptor_dirty_if_older_than(
1065 now
- FORCE_REGENERATE_DESCRIPTOR_INTERVAL
);
1066 consider_publishable_server(0);
1067 /* also, check religiously for reachability, if it's within the first
1068 * 20 minutes of our uptime. */
1069 if (server_mode(options
) &&
1070 (has_completed_circuit
|| !any_predicted_circuits(now
)) &&
1071 !we_are_hibernating()) {
1072 if (stats_n_seconds_working
< TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT
) {
1073 consider_testing_reachability(1, dirport_reachability_count
==0);
1074 if (++dirport_reachability_count
> 5)
1075 dirport_reachability_count
= 0;
1076 } else if (time_to_recheck_bandwidth
< now
) {
1077 /* If we haven't checked for 12 hours and our bandwidth estimate is
1078 * low, do another bandwidth test. This is especially important for
1079 * bridges, since they might go long periods without much use. */
1080 routerinfo_t
*me
= router_get_my_routerinfo();
1081 if (time_to_recheck_bandwidth
&& me
&&
1082 me
->bandwidthcapacity
< me
->bandwidthrate
&&
1083 me
->bandwidthcapacity
< 51200) {
1084 reset_bandwidth_test();
1086 #define BANDWIDTH_RECHECK_INTERVAL (12*60*60)
1087 time_to_recheck_bandwidth
= now
+ BANDWIDTH_RECHECK_INTERVAL
;
1091 /* If any networkstatus documents are no longer recent, we need to
1092 * update all the descriptors' running status. */
1093 /* purge obsolete entries */
1094 networkstatus_v2_list_clean(now
);
1095 /* Remove dead routers. */
1096 routerlist_remove_old_routers();
1098 /* Also, once per minute, check whether we want to download any
1099 * networkstatus documents.
1101 update_networkstatus_downloads(now
);
1104 /** 2c. Let directory voting happen. */
1105 if (authdir_mode_v3(options
))
1106 dirvote_act(options
, now
);
1108 /** 3a. Every second, we examine pending circuits and prune the
1109 * ones which have been pending for more than a few seconds.
1110 * We do this before step 4, so it can try building more if
1111 * it's not comfortable with the number of available circuits.
1113 circuit_expire_building(now
);
1115 /** 3b. Also look at pending streams and prune the ones that 'began'
1116 * a long time ago but haven't gotten a 'connected' yet.
1117 * Do this before step 4, so we can put them back into pending
1118 * state to be picked up by the new circuit.
1120 connection_ap_expire_beginning();
1122 /** 3c. And expire connections that we've held open for too long.
1124 connection_expire_held_open();
1126 /** 3d. And every 60 seconds, we relaunch listeners if any died. */
1127 if (!we_are_hibernating() && time_to_check_listeners
< now
) {
1128 retry_all_listeners(NULL
, NULL
);
1129 time_to_check_listeners
= now
+60;
1132 /** 4. Every second, we try a new circuit if there are no valid
1133 * circuits. Every NewCircuitPeriod seconds, we expire circuits
1134 * that became dirty more than MaxCircuitDirtiness seconds ago,
1135 * and we make a new circ if there are no clean circuits.
1137 have_dir_info
= router_have_minimum_dir_info();
1138 if (have_dir_info
&& !we_are_hibernating())
1139 circuit_build_needed_circs(now
);
1141 /** 5. We do housekeeping for each connection... */
1142 connection_or_set_bad_connections();
1143 for (i
=0;i
<smartlist_len(connection_array
);i
++) {
1144 run_connection_housekeeping(i
, now
);
1146 if (time_to_shrink_memory
< now
) {
1147 SMARTLIST_FOREACH(connection_array
, connection_t
*, conn
, {
1149 buf_shrink(conn
->outbuf
);
1151 buf_shrink(conn
->inbuf
);
1154 buf_shrink_freelists(0);
1155 /** How often do we check buffers and pools for empty space that can be
1157 #define MEM_SHRINK_INTERVAL (60)
1158 time_to_shrink_memory
= now
+ MEM_SHRINK_INTERVAL
;
1161 /** 6. And remove any marked circuits... */
1162 circuit_close_all_marked();
1164 /** 7. And upload service descriptors if necessary. */
1165 if (has_completed_circuit
&& !we_are_hibernating()) {
1166 rend_consider_services_upload(now
);
1167 rend_consider_descriptor_republication();
1170 /** 8. and blow away any connections that need to die. have to do this now,
1171 * because if we marked a conn for close and left its socket -1, then
1172 * we'll pass it to poll/select and bad things will happen.
1174 close_closeable_connections();
1176 /** 8b. And if anything in our state is ready to get flushed to disk, we
1180 /** 9. and if we're a server, check whether our DNS is telling stories to
1182 if (server_mode(options
) && time_to_check_for_correct_dns
< now
) {
1183 if (!time_to_check_for_correct_dns
) {
1184 time_to_check_for_correct_dns
= now
+ 60 + crypto_rand_int(120);
1186 dns_launch_correctness_checks();
1187 time_to_check_for_correct_dns
= now
+ 12*3600 +
1188 crypto_rand_int(12*3600);
1192 /** 10b. write bridge networkstatus file to disk */
1193 if (options
->BridgeAuthoritativeDir
&&
1194 time_to_write_bridge_status_file
< now
) {
1195 networkstatus_dump_bridge_status_to_file(now
);
1196 #define BRIDGE_STATUSFILE_INTERVAL (30*60)
1197 time_to_write_bridge_status_file
= now
+BRIDGE_STATUSFILE_INTERVAL
;
1201 /** Libevent timer: used to invoke second_elapsed_callback() once per
1203 static struct event
*timeout_event
= NULL
;
1204 /** Number of libevent errors in the last second: we die if we get too many. */
1205 static int n_libevent_errors
= 0;
1207 /** Libevent callback: invoked once every second. */
1209 second_elapsed_callback(int fd
, short event
, void *args
)
1211 /* XXXX This could be sensibly refactored into multiple callbacks, and we
1212 * could use Libevent's timers for this rather than checking the current
1213 * time against a bunch of timeouts every second. */
1214 static struct timeval one_second
;
1215 static time_t current_second
= 0;
1217 size_t bytes_written
;
1219 int seconds_elapsed
;
1220 or_options_t
*options
= get_options();
1224 if (!timeout_event
) {
1225 timeout_event
= tor_evtimer_new(tor_libevent_get_base(),
1226 second_elapsed_callback
, NULL
);
1227 one_second
.tv_sec
= 1;
1228 one_second
.tv_usec
= 0;
1231 n_libevent_errors
= 0;
1233 /* log_fn(LOG_NOTICE, "Tick."); */
1235 update_approx_time(now
);
1237 /* the second has rolled over. check more stuff. */
1238 bytes_written
= stats_prev_global_write_bucket
- global_write_bucket
;
1239 bytes_read
= stats_prev_global_read_bucket
- global_read_bucket
;
1240 seconds_elapsed
= current_second
? (int)(now
- current_second
) : 0;
1241 stats_n_bytes_read
+= bytes_read
;
1242 stats_n_bytes_written
+= bytes_written
;
1243 if (accounting_is_enabled(options
) && seconds_elapsed
>= 0)
1244 accounting_add_bytes(bytes_read
, bytes_written
, seconds_elapsed
);
1245 control_event_bandwidth_used((uint32_t)bytes_read
,(uint32_t)bytes_written
);
1246 control_event_stream_bandwidth_used();
1248 if (seconds_elapsed
> 0)
1249 connection_bucket_refill(seconds_elapsed
, now
);
1250 stats_prev_global_read_bucket
= global_read_bucket
;
1251 stats_prev_global_write_bucket
= global_write_bucket
;
1253 if (server_mode(options
) &&
1254 !we_are_hibernating() &&
1255 seconds_elapsed
> 0 &&
1256 has_completed_circuit
&&
1257 stats_n_seconds_working
/ TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT
!=
1258 (stats_n_seconds_working
+seconds_elapsed
) /
1259 TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT
) {
1260 /* every 20 minutes, check and complain if necessary */
1261 routerinfo_t
*me
= router_get_my_routerinfo();
1262 if (me
&& !check_whether_orport_reachable()) {
1263 log_warn(LD_CONFIG
,"Your server (%s:%d) has not managed to confirm that "
1264 "its ORPort is reachable. Please check your firewalls, ports, "
1265 "address, /etc/hosts file, etc.",
1266 me
->address
, me
->or_port
);
1267 control_event_server_status(LOG_WARN
,
1268 "REACHABILITY_FAILED ORADDRESS=%s:%d",
1269 me
->address
, me
->or_port
);
1272 if (me
&& !check_whether_dirport_reachable()) {
1274 "Your server (%s:%d) has not managed to confirm that its "
1275 "DirPort is reachable. Please check your firewalls, ports, "
1276 "address, /etc/hosts file, etc.",
1277 me
->address
, me
->dir_port
);
1278 control_event_server_status(LOG_WARN
,
1279 "REACHABILITY_FAILED DIRADDRESS=%s:%d",
1280 me
->address
, me
->dir_port
);
1284 /** If more than this many seconds have elapsed, probably the clock
1285 * jumped: doesn't count. */
1286 #define NUM_JUMPED_SECONDS_BEFORE_WARN 100
1287 if (seconds_elapsed
< -NUM_JUMPED_SECONDS_BEFORE_WARN
||
1288 seconds_elapsed
>= NUM_JUMPED_SECONDS_BEFORE_WARN
) {
1289 circuit_note_clock_jumped(seconds_elapsed
);
1290 /* XXX if the time jumps *back* many months, do our events in
1291 * run_scheduled_events() recover? I don't think they do. -RD */
1292 } else if (seconds_elapsed
> 0)
1293 stats_n_seconds_working
+= seconds_elapsed
;
1295 run_scheduled_events(now
);
1297 current_second
= now
; /* remember which second it is, for next time */
1299 if (event_add(timeout_event
, &one_second
))
1301 "Error from libevent when setting one-second timeout event");
1305 /** Called when a possibly ignorable libevent error occurs; ensures that we
1306 * don't get into an infinite loop by ignoring too many errors from
1309 got_libevent_error(void)
1311 if (++n_libevent_errors
> 8) {
1312 log_err(LD_NET
, "Too many libevent errors in one second; dying");
1319 #define UPTIME_CUTOFF_FOR_NEW_BANDWIDTH_TEST (6*60*60)
1321 /** Called when our IP address seems to have changed. <b>at_interface</b>
1322 * should be true if we detected a change in our interface, and false if we
1323 * detected a change in our published address. */
1325 ip_address_changed(int at_interface
)
1327 int server
= server_mode(get_options());
1331 /* Okay, change our keys. */
1336 if (stats_n_seconds_working
> UPTIME_CUTOFF_FOR_NEW_BANDWIDTH_TEST
)
1337 reset_bandwidth_test();
1338 stats_n_seconds_working
= 0;
1339 router_reset_reachability();
1340 mark_my_descriptor_dirty();
1344 dns_servers_relaunch_checks();
1347 /** Forget what we've learned about the correctness of our DNS servers, and
1348 * start learning again. */
1350 dns_servers_relaunch_checks(void)
1352 if (server_mode(get_options())) {
1353 dns_reset_correctness_checks();
1354 time_to_check_for_correct_dns
= 0;
1358 /** Called when we get a SIGHUP: reload configuration files and keys,
1359 * retry all connections, and so on. */
1363 or_options_t
*options
= get_options();
1366 dmalloc_log_stats();
1367 dmalloc_log_changed(0, 1, 0, 0);
1370 log_notice(LD_GENERAL
,"Received reload signal (hup). Reloading config and "
1371 "resetting internal state.");
1372 if (accounting_is_enabled(options
))
1373 accounting_record_bandwidth_usage(time(NULL
), get_or_state());
1375 router_reset_warnings();
1376 routerlist_reset_warnings();
1377 addressmap_clear_transient();
1378 /* first, reload config variables, in case they've changed */
1379 if (options
->ReloadTorrcOnSIGHUP
) {
1380 /* no need to provide argc/v, they've been cached in init_from_config */
1381 if (options_init_from_torrc(0, NULL
) < 0) {
1382 log_err(LD_CONFIG
,"Reading config failed--see warnings above. "
1383 "For usage, try -h.");
1386 options
= get_options(); /* they have changed now */
1388 log_notice(LD_GENERAL
, "Not reloading config file: the controller told "
1391 if (authdir_mode_handles_descs(options
, -1)) {
1392 /* reload the approved-routers file */
1393 if (dirserv_load_fingerprint_file() < 0) {
1394 /* warnings are logged from dirserv_load_fingerprint_file() directly */
1395 log_info(LD_GENERAL
, "Error reloading fingerprints. "
1396 "Continuing with old list.");
1400 /* Rotate away from the old dirty circuits. This has to be done
1401 * after we've read the new options, but before we start using
1402 * circuits for directory fetches. */
1403 circuit_expire_all_dirty_circs();
1405 /* retry appropriate downloads */
1406 router_reset_status_download_failures();
1407 router_reset_descriptor_download_failures();
1408 update_networkstatus_downloads(time(NULL
));
1410 /* We'll retry routerstatus downloads in about 10 seconds; no need to
1411 * force a retry there. */
1413 if (server_mode(options
)) {
1414 /* Restart cpuworker and dnsworker processes, so they get up-to-date
1415 * configuration options. */
1416 cpuworkers_rotate();
1422 /** Tor main loop. */
1429 /* initialize dns resolve map, spawn workers if needed */
1430 if (dns_init() < 0) {
1431 if (get_options()->ServerDNSAllowBrokenConfig
)
1432 log_warn(LD_GENERAL
, "Couldn't set up any working nameservers. "
1433 "Network not up yet? Will try again soon.");
1435 log_err(LD_GENERAL
,"Error initializing dns subsystem; exiting. To "
1436 "retry instead, set the ServerDNSAllowBrokenResolvConf option.");
1442 /* load the private keys, if we're supposed to have them, and set up the
1444 if (! identity_key_is_set()) {
1445 if (init_keys() < 0) {
1446 log_err(LD_BUG
,"Error initializing keys; exiting");
1451 /* Set up the packed_cell_t memory pool. */
1454 /* Set up our buckets */
1455 connection_bucket_init();
1456 stats_prev_global_read_bucket
= global_read_bucket
;
1457 stats_prev_global_write_bucket
= global_write_bucket
;
1459 /* initialize the bootstrap status events to know we're starting up */
1460 control_event_bootstrap(BOOTSTRAP_STATUS_STARTING
, 0);
1462 if (trusted_dirs_reload_certs()) {
1464 "Couldn't load all cached v3 certificates. Starting anyway.");
1466 if (router_reload_v2_networkstatus()) {
1469 if (router_reload_consensus_networkstatus()) {
1472 /* load the routers file, or assign the defaults. */
1473 if (router_reload_router_list()) {
1476 /* load the networkstatuses. (This launches a download for new routers as
1480 directory_info_has_arrived(now
, 1);
1482 if (server_mode(get_options())) {
1483 /* launch cpuworkers. Need to do this *after* we've read the onion key. */
1487 /* set up once-a-second callback. */
1488 second_elapsed_callback(0,0,NULL
);
1491 if (nt_service_is_stopping())
1495 /* Make it easier to tell whether libevent failure is our fault or not. */
1498 /* All active linked conns should get their read events activated. */
1499 SMARTLIST_FOREACH(active_linked_connection_lst
, connection_t
*, conn
,
1500 event_active(conn
->read_event
, EV_READ
, 1));
1501 called_loop_once
= smartlist_len(active_linked_connection_lst
) ? 1 : 0;
1503 update_approx_time(time(NULL
));
1505 /* poll until we have an event, or the second ends, or until we have
1506 * some active linked connections to trigger events for. */
1507 loop_result
= event_base_loop(tor_libevent_get_base(),
1508 called_loop_once
? EVLOOP_ONCE
: 0);
1510 /* let catch() handle things like ^c, and otherwise don't worry about it */
1511 if (loop_result
< 0) {
1512 int e
= tor_socket_errno(-1);
1513 /* let the program survive things like ^z */
1514 if (e
!= EINTR
&& !ERRNO_IS_EINPROGRESS(e
)) {
1515 log_err(LD_NET
,"libevent call with %s failed: %s [%d]",
1516 tor_libevent_get_method(), tor_socket_strerror(e
), e
);
1519 } else if (e
== EINVAL
) {
1520 log_warn(LD_NET
, "EINVAL from libevent: should you upgrade libevent?");
1521 if (got_libevent_error())
1525 if (ERRNO_IS_EINPROGRESS(e
))
1527 "libevent call returned EINPROGRESS? Please report.");
1528 log_debug(LD_NET
,"libevent call interrupted.");
1529 /* You can't trust the results of this poll(). Go back to the
1530 * top of the big for loop. */
1537 /** Used to implement the SIGNAL control command: if we accept
1538 * <b>the_signal</b> as a remote pseudo-signal, act on it. */
1539 /* We don't re-use catch() here because:
1540 * 1. We handle a different set of signals than those allowed in catch.
1541 * 2. Platforms without signal() are unlikely to define SIGfoo.
1542 * 3. The control spec is defined to use fixed numeric signal values
1543 * which just happen to match the Unix values.
1546 control_signal_act(int the_signal
)
1551 signal_callback(0,0,(void*)(uintptr_t)SIGHUP
);
1554 signal_callback(0,0,(void*)(uintptr_t)SIGINT
);
1557 signal_callback(0,0,(void*)(uintptr_t)SIGUSR1
);
1560 signal_callback(0,0,(void*)(uintptr_t)SIGUSR2
);
1563 signal_callback(0,0,(void*)(uintptr_t)SIGTERM
);
1566 signal_callback(0,0,(void*)(uintptr_t)SIGNEWNYM
);
1568 case SIGCLEARDNSCACHE
:
1569 signal_callback(0,0,(void*)(uintptr_t)SIGCLEARDNSCACHE
);
1572 log_warn(LD_BUG
, "Unrecognized signal number %d.", the_signal
);
1577 /** Libevent callback: invoked when we get a signal.
1580 signal_callback(int fd
, short events
, void *arg
)
1582 uintptr_t sig
= (uintptr_t)arg
;
1588 log_notice(LD_GENERAL
,"Catching signal TERM, exiting cleanly.");
1593 if (!server_mode(get_options())) { /* do it now */
1594 log_notice(LD_GENERAL
,"Interrupt: exiting cleanly.");
1598 hibernate_begin_shutdown();
1602 log_debug(LD_GENERAL
,"Caught SIGPIPE. Ignoring.");
1606 /* prefer to log it at INFO, but make sure we always see it */
1607 dumpstats(get_min_log_level()<LOG_INFO
? get_min_log_level() : LOG_INFO
);
1610 switch_logs_debug();
1611 log_debug(LD_GENERAL
,"Caught USR2, going to loglevel debug. "
1612 "Send HUP to change back.");
1616 log_warn(LD_CONFIG
,"Restart failed (config error?). Exiting.");
1623 while (waitpid(-1,NULL
,WNOHANG
) > 0) ; /* keep reaping until no more
1628 time_t now
= time(NULL
);
1629 if (time_of_last_signewnym
+ MAX_SIGNEWNYM_RATE
> now
) {
1630 signewnym_is_pending
= 1;
1631 log(LOG_NOTICE
, LD_CONTROL
,
1632 "Rate limiting NEWNYM request: delaying by %d second(s)",
1633 (int)(MAX_SIGNEWNYM_RATE
+time_of_last_signewnym
-now
));
1635 signewnym_impl(now
);
1639 case SIGCLEARDNSCACHE
:
1640 addressmap_clear_transient();
1645 extern uint64_t rephist_total_alloc
;
1646 extern uint32_t rephist_total_num
;
1649 * Write current memory usage information to the log.
1652 dumpmemusage(int severity
)
1654 connection_dump_buffer_mem_stats(severity
);
1655 log(severity
, LD_GENERAL
, "In rephist: "U64_FORMAT
" used by %d Tors.",
1656 U64_PRINTF_ARG(rephist_total_alloc
), rephist_total_num
);
1657 dump_routerlist_mem_usage(severity
);
1658 dump_cell_pool_usage(severity
);
1659 dump_dns_mem_usage(severity
);
1660 buf_dump_freelist_sizes(severity
);
1661 tor_log_mallinfo(severity
);
1664 /** Write all statistics to the log, with log level 'severity'. Called
1665 * in response to a SIGUSR1. */
1667 dumpstats(int severity
)
1669 time_t now
= time(NULL
);
1671 size_t rbuf_cap
, wbuf_cap
, rbuf_len
, wbuf_len
;
1673 log(severity
, LD_GENERAL
, "Dumping stats:");
1675 SMARTLIST_FOREACH(connection_array
, connection_t
*, conn
,
1677 int i
= conn_sl_idx
;
1678 log(severity
, LD_GENERAL
,
1679 "Conn %d (socket %d) type %d (%s), state %d (%s), created %d secs ago",
1680 i
, conn
->s
, conn
->type
, conn_type_to_string(conn
->type
),
1681 conn
->state
, conn_state_to_string(conn
->type
, conn
->state
),
1682 (int)(now
- conn
->timestamp_created
));
1683 if (!connection_is_listener(conn
)) {
1684 log(severity
,LD_GENERAL
,
1685 "Conn %d is to %s:%d.", i
,
1686 safe_str_client(conn
->address
),
1688 log(severity
,LD_GENERAL
,
1689 "Conn %d: %d bytes waiting on inbuf (len %d, last read %d secs ago)",
1691 (int)buf_datalen(conn
->inbuf
),
1692 (int)buf_allocation(conn
->inbuf
),
1693 (int)(now
- conn
->timestamp_lastread
));
1694 log(severity
,LD_GENERAL
,
1695 "Conn %d: %d bytes waiting on outbuf "
1696 "(len %d, last written %d secs ago)",i
,
1697 (int)buf_datalen(conn
->outbuf
),
1698 (int)buf_allocation(conn
->outbuf
),
1699 (int)(now
- conn
->timestamp_lastwritten
));
1700 if (conn
->type
== CONN_TYPE_OR
) {
1701 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
1703 tor_tls_get_buffer_sizes(or_conn
->tls
, &rbuf_cap
, &rbuf_len
,
1704 &wbuf_cap
, &wbuf_len
);
1705 log(severity
, LD_GENERAL
,
1706 "Conn %d: %d/%d bytes used on OpenSSL read buffer; "
1707 "%d/%d bytes used on write buffer.",
1708 i
, (int)rbuf_len
, (int)rbuf_cap
, (int)wbuf_len
, (int)wbuf_cap
);
1712 circuit_dump_by_conn(conn
, severity
); /* dump info about all the circuits
1713 * using this conn */
1715 log(severity
, LD_NET
,
1716 "Cells processed: "U64_FORMAT
" padding\n"
1717 " "U64_FORMAT
" create\n"
1718 " "U64_FORMAT
" created\n"
1719 " "U64_FORMAT
" relay\n"
1720 " ("U64_FORMAT
" relayed)\n"
1721 " ("U64_FORMAT
" delivered)\n"
1722 " "U64_FORMAT
" destroy",
1723 U64_PRINTF_ARG(stats_n_padding_cells_processed
),
1724 U64_PRINTF_ARG(stats_n_create_cells_processed
),
1725 U64_PRINTF_ARG(stats_n_created_cells_processed
),
1726 U64_PRINTF_ARG(stats_n_relay_cells_processed
),
1727 U64_PRINTF_ARG(stats_n_relay_cells_relayed
),
1728 U64_PRINTF_ARG(stats_n_relay_cells_delivered
),
1729 U64_PRINTF_ARG(stats_n_destroy_cells_processed
));
1730 if (stats_n_data_cells_packaged
)
1731 log(severity
,LD_NET
,"Average packaged cell fullness: %2.3f%%",
1732 100*(U64_TO_DBL(stats_n_data_bytes_packaged
) /
1733 U64_TO_DBL(stats_n_data_cells_packaged
*RELAY_PAYLOAD_SIZE
)) );
1734 if (stats_n_data_cells_received
)
1735 log(severity
,LD_NET
,"Average delivered cell fullness: %2.3f%%",
1736 100*(U64_TO_DBL(stats_n_data_bytes_received
) /
1737 U64_TO_DBL(stats_n_data_cells_received
*RELAY_PAYLOAD_SIZE
)) );
1739 if (now
- time_of_process_start
>= 0)
1740 elapsed
= now
- time_of_process_start
;
1745 log(severity
, LD_NET
,
1746 "Average bandwidth: "U64_FORMAT
"/%d = %d bytes/sec reading",
1747 U64_PRINTF_ARG(stats_n_bytes_read
),
1749 (int) (stats_n_bytes_read
/elapsed
));
1750 log(severity
, LD_NET
,
1751 "Average bandwidth: "U64_FORMAT
"/%d = %d bytes/sec writing",
1752 U64_PRINTF_ARG(stats_n_bytes_written
),
1754 (int) (stats_n_bytes_written
/elapsed
));
1757 log(severity
, LD_NET
, "--------------- Dumping memory information:");
1758 dumpmemusage(severity
);
1760 rep_hist_dump_stats(now
,severity
);
1761 rend_service_dump_stats(severity
);
1762 dump_pk_ops(severity
);
1763 dump_distinct_digest_count(severity
);
1766 /** Called by exit() as we shut down the process.
1771 /* NOTE: If we ever daemonize, this gets called immediately. That's
1772 * okay for now, because we only use this on Windows. */
1778 /** Set up the signal handlers for either parent or child. */
1780 handle_signals(int is_parent
)
1782 #ifndef MS_WINDOWS /* do signal stuff only on Unix */
1784 static const int signals
[] = {
1785 SIGINT
, /* do a controlled slow shutdown */
1786 SIGTERM
, /* to terminate now */
1787 SIGPIPE
, /* otherwise SIGPIPE kills us */
1788 SIGUSR1
, /* dump stats */
1789 SIGUSR2
, /* go to loglevel debug */
1790 SIGHUP
, /* to reload config, retry conns, etc */
1792 SIGXFSZ
, /* handle file-too-big resource exhaustion */
1794 SIGCHLD
, /* handle dns/cpu workers that exit */
1796 static struct event
*signal_events
[16]; /* bigger than it has to be. */
1798 for (i
= 0; signals
[i
] >= 0; ++i
) {
1799 signal_events
[i
] = tor_evsignal_new(
1800 tor_libevent_get_base(), signals
[i
], signal_callback
,
1801 (void*)(uintptr_t)signals
[i
]);
1802 if (event_add(signal_events
[i
], NULL
))
1803 log_warn(LD_BUG
, "Error from libevent when adding event for signal %d",
1807 struct sigaction action
;
1808 action
.sa_flags
= 0;
1809 sigemptyset(&action
.sa_mask
);
1810 action
.sa_handler
= SIG_IGN
;
1811 sigaction(SIGINT
, &action
, NULL
);
1812 sigaction(SIGTERM
, &action
, NULL
);
1813 sigaction(SIGPIPE
, &action
, NULL
);
1814 sigaction(SIGUSR1
, &action
, NULL
);
1815 sigaction(SIGUSR2
, &action
, NULL
);
1816 sigaction(SIGHUP
, &action
, NULL
);
1818 sigaction(SIGXFSZ
, &action
, NULL
);
1821 #else /* MS windows */
1823 #endif /* signal stuff */
1826 /** Main entry point for the Tor command-line client.
1829 tor_init(int argc
, char *argv
[])
1833 time_of_process_start
= time(NULL
);
1834 if (!connection_array
)
1835 connection_array
= smartlist_create();
1836 if (!closeable_connection_lst
)
1837 closeable_connection_lst
= smartlist_create();
1838 if (!active_linked_connection_lst
)
1839 active_linked_connection_lst
= smartlist_create();
1840 /* Have the log set up with our application name. */
1841 tor_snprintf(buf
, sizeof(buf
), "Tor %s", get_version());
1842 log_set_application_name(buf
);
1843 /* Initialize the history structures. */
1845 /* Initialize the service cache. */
1847 addressmap_init(); /* Init the client dns cache. Do it always, since it's
1850 /* We search for the "quiet" option first, since it decides whether we
1851 * will log anything at all to the command line. */
1852 for (i
=1;i
<argc
;++i
) {
1853 if (!strcmp(argv
[i
], "--hush"))
1855 if (!strcmp(argv
[i
], "--quiet"))
1858 /* give it somewhere to log to initially */
1861 /* no initial logging */
1864 add_temp_log(LOG_WARN
);
1867 add_temp_log(LOG_NOTICE
);
1870 log(LOG_NOTICE
, LD_GENERAL
, "Tor v%s. This is experimental software. "
1871 "Do not rely on it for strong anonymity. (Running on %s)",get_version(),
1874 if (network_init()<0) {
1875 log_err(LD_BUG
,"Error initializing network; exiting.");
1878 atexit(exit_function
);
1880 if (options_init_from_torrc(argc
,argv
) < 0) {
1881 log_err(LD_CONFIG
,"Reading config failed--see warnings above.");
1887 log_warn(LD_GENERAL
,"You are running Tor as root. You don't need to, "
1888 "and you probably shouldn't.");
1891 if (crypto_global_init(get_options()->HardwareAccel
,
1892 get_options()->AccelName
,
1893 get_options()->AccelDir
)) {
1894 log_err(LD_BUG
, "Unable to initialize OpenSSL. Exiting.");
1901 /** A lockfile structure, used to prevent two Tors from messing with the
1902 * data directory at once. If this variable is non-NULL, we're holding
1904 static tor_lockfile_t
*lockfile
= NULL
;
1906 /** Try to grab the lock file described in <b>options</b>, if we do not
1907 * already have it. If <b>err_if_locked</b> is true, warn if somebody else is
1908 * holding the lock, and exit if we can't get it after waiting. Otherwise,
1909 * return -1 if we can't get the lockfile. Return 0 on success.
1912 try_locking(or_options_t
*options
, int err_if_locked
)
1917 char *fname
= options_get_datadir_fname2_suffix(options
, "lock",NULL
,NULL
);
1918 int already_locked
= 0;
1919 tor_lockfile_t
*lf
= tor_lockfile_lock(fname
, 0, &already_locked
);
1922 if (err_if_locked
&& already_locked
) {
1924 log_warn(LD_GENERAL
, "It looks like another Tor process is running "
1925 "with the same data directory. Waiting 5 seconds to see "
1926 "if it goes away.");
1932 r
= try_locking(options
, 0);
1934 log_err(LD_GENERAL
, "No, it's still there. Exiting.");
1946 /** Return true iff we've successfully acquired the lock file. */
1950 return lockfile
!= NULL
;
1953 /** If we have successfully acquired the lock file, release it. */
1955 release_lockfile(void)
1958 tor_lockfile_unlock(lockfile
);
1963 /** Free all memory that we might have allocated somewhere.
1964 * If <b>postfork</b>, we are a worker process and we want to free
1965 * only the parts of memory that we won't touch. If !<b>postfork</b>,
1966 * Tor is shutting down and we should free everything.
1968 * Helps us find the real leaks with dmalloc and the like. Also valgrind
1969 * should then report 0 reachable in its leak report (in an ideal world --
1970 * in practice libevent, SSL, libc etc never quite free everything). */
1972 tor_free_all(int postfork
)
1979 routerlist_free_all();
1980 networkstatus_free_all();
1981 addressmap_free_all();
1983 rend_service_free_all();
1984 rend_cache_free_all();
1985 rend_service_authorization_free_all();
1986 rep_hist_free_all();
1988 clear_pending_onions();
1990 entry_guards_free_all();
1991 connection_free_all();
1992 buf_shrink_freelists(1);
1993 memarea_clear_freelist();
1994 microdesc_free_all();
1998 policies_free_all();
2004 /* stuff in main.c */
2006 smartlist_free(connection_array
);
2007 smartlist_free(closeable_connection_lst
);
2008 smartlist_free(active_linked_connection_lst
);
2009 tor_free(timeout_event
);
2013 /* Stuff in util.c and address.c*/
2016 esc_router_info(NULL
);
2017 logs_free_all(); /* free log strings. do this last so logs keep working. */
2021 /** Do whatever cleanup is necessary before shutting Tor down. */
2025 or_options_t
*options
= get_options();
2026 /* Remove our pid file. We don't care if there was an error when we
2027 * unlink, nothing we could do about it anyways. */
2028 if (options
->command
== CMD_RUN_TOR
) {
2029 time_t now
= time(NULL
);
2030 if (options
->PidFile
)
2031 unlink(options
->PidFile
);
2032 if (accounting_is_enabled(options
))
2033 accounting_record_bandwidth_usage(now
, get_or_state());
2034 or_state_mark_dirty(get_or_state(), 0); /* force an immediate save. */
2036 if (authdir_mode_tests_reachability(options
))
2037 rep_hist_record_mtbf_data(now
, 0);
2040 dmalloc_log_stats();
2042 tor_free_all(0); /* We could move tor_free_all back into the ifdef below
2043 later, if it makes shutdown unacceptably slow. But for
2044 now, leave it here: it's helped us catch bugs in the
2046 crypto_global_cleanup();
2048 dmalloc_log_unfreed();
2053 /** Read/create keys as needed, and echo our fingerprint to stdout. */
2055 do_list_fingerprint(void)
2057 char buf
[FINGERPRINT_LEN
+1];
2059 const char *nickname
= get_options()->Nickname
;
2060 if (!server_mode(get_options())) {
2062 "Clients don't have long-term identity keys. Exiting.\n");
2065 tor_assert(nickname
);
2066 if (init_keys() < 0) {
2067 log_err(LD_BUG
,"Error initializing keys; can't display fingerprint");
2070 if (!(k
= get_identity_key())) {
2071 log_err(LD_GENERAL
,"Error: missing identity key.");
2074 if (crypto_pk_get_fingerprint(k
, buf
, 1)<0) {
2075 log_err(LD_BUG
, "Error computing fingerprint");
2078 printf("%s %s\n", nickname
, buf
);
2082 /** Entry point for password hashing: take the desired password from
2083 * the command line, and print its salted hash to stdout. **/
2085 do_hash_password(void)
2089 char key
[S2K_SPECIFIER_LEN
+DIGEST_LEN
];
2091 crypto_rand(key
, S2K_SPECIFIER_LEN
-1);
2092 key
[S2K_SPECIFIER_LEN
-1] = (uint8_t)96; /* Hash 64 K of data. */
2093 secret_to_key(key
+S2K_SPECIFIER_LEN
, DIGEST_LEN
,
2094 get_options()->command_arg
, strlen(get_options()->command_arg
),
2096 base16_encode(output
, sizeof(output
), key
, sizeof(key
));
2097 printf("16:%s\n",output
);
2100 /** Main entry point for the Tor process. Called from main(). */
2101 /* This function is distinct from main() only so we can link main.c into
2102 * the unittest binary without conflicting with the unittests' main. */
2104 tor_main(int argc
, char *argv
[])
2107 update_approx_time(time(NULL
));
2112 /* Instruct OpenSSL to use our internal wrappers for malloc,
2113 realloc and free. */
2114 int r
= CRYPTO_set_mem_ex_functions(_tor_malloc
, _tor_realloc
, _tor_free
);
2121 result
= nt_service_parse_options(argc
, argv
, &done
);
2122 if (done
) return result
;
2125 if (tor_init(argc
, argv
)<0)
2127 switch (get_options()->command
) {
2130 nt_service_set_state(SERVICE_RUNNING
);
2132 result
= do_main_loop();
2134 case CMD_LIST_FINGERPRINT
:
2135 result
= do_list_fingerprint();
2137 case CMD_HASH_PASSWORD
:
2141 case CMD_VERIFY_CONFIG
:
2142 printf("Configuration was valid\n");
2145 case CMD_RUN_UNITTESTS
: /* only set by test.c */
2147 log_warn(LD_BUG
,"Illegal command number %d: internal error.",
2148 get_options()->command
);