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) 2007-2009, The Tor Project, Inc. */
5 /* See LICENSE for licensing information */
9 * \brief General high-level functions to handle reading and writing
15 static connection_t
*connection_create_listener(
16 struct sockaddr
*listensockaddr
,
17 socklen_t listensocklen
, int type
,
19 static void connection_init(time_t now
, connection_t
*conn
, int type
,
21 static int connection_init_accepted_conn(connection_t
*conn
,
22 uint8_t listener_type
);
23 static int connection_handle_listener_read(connection_t
*conn
, int new_type
);
24 static int connection_read_bucket_should_increase(or_connection_t
*conn
);
25 static int connection_finished_flushing(connection_t
*conn
);
26 static int connection_flushed_some(connection_t
*conn
);
27 static int connection_finished_connecting(connection_t
*conn
);
28 static int connection_reached_eof(connection_t
*conn
);
29 static int connection_read_to_buf(connection_t
*conn
, int *max_to_read
,
31 static int connection_process_inbuf(connection_t
*conn
, int package_partial
);
32 static void client_check_address_changed(int sock
);
33 static void set_constrained_socket_buffers(int sock
, int size
);
35 static const char *connection_proxy_state_to_string(int state
);
36 static int connection_read_https_proxy_response(connection_t
*conn
);
37 static void connection_send_socks5_connect(connection_t
*conn
);
39 /** The last IPv4 address that our network interface seemed to have been
40 * binding to, in host order. We use this to detect when our IP changes. */
41 static uint32_t last_interface_ip
= 0;
42 /** A list of uint32_ts for addresses we've used in outgoing connections.
43 * Used to detect IP address changes. */
44 static smartlist_t
*outgoing_addrs
= NULL
;
46 /**************************************************************/
49 * Return the human-readable name for the connection type <b>type</b>
52 conn_type_to_string(int type
)
56 case CONN_TYPE_OR_LISTENER
: return "OR listener";
57 case CONN_TYPE_OR
: return "OR";
58 case CONN_TYPE_EXIT
: return "Exit";
59 case CONN_TYPE_AP_LISTENER
: return "Socks listener";
60 case CONN_TYPE_AP_TRANS_LISTENER
:
61 return "Transparent pf/netfilter listener";
62 case CONN_TYPE_AP_NATD_LISTENER
: return "Transparent natd listener";
63 case CONN_TYPE_AP_DNS_LISTENER
: return "DNS listener";
64 case CONN_TYPE_AP
: return "Socks";
65 case CONN_TYPE_DIR_LISTENER
: return "Directory listener";
66 case CONN_TYPE_DIR
: return "Directory";
67 case CONN_TYPE_CPUWORKER
: return "CPU worker";
68 case CONN_TYPE_CONTROL_LISTENER
: return "Control listener";
69 case CONN_TYPE_CONTROL
: return "Control";
71 log_warn(LD_BUG
, "unknown connection type %d", type
);
72 tor_snprintf(buf
, sizeof(buf
), "unknown [%d]", type
);
78 * Return the human-readable name for the connection state <b>state</b>
79 * for the connection type <b>type</b>
82 conn_state_to_string(int type
, int state
)
86 case CONN_TYPE_OR_LISTENER
:
87 case CONN_TYPE_AP_LISTENER
:
88 case CONN_TYPE_AP_TRANS_LISTENER
:
89 case CONN_TYPE_AP_NATD_LISTENER
:
90 case CONN_TYPE_AP_DNS_LISTENER
:
91 case CONN_TYPE_DIR_LISTENER
:
92 case CONN_TYPE_CONTROL_LISTENER
:
93 if (state
== LISTENER_STATE_READY
)
98 case OR_CONN_STATE_CONNECTING
: return "connect()ing";
99 case OR_CONN_STATE_PROXY_HANDSHAKING
: return "handshaking (proxy)";
100 case OR_CONN_STATE_TLS_HANDSHAKING
: return "handshaking (TLS)";
101 case OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING
:
102 return "renegotiating (TLS)";
103 case OR_CONN_STATE_TLS_SERVER_RENEGOTIATING
:
104 return "waiting for renegotiation (TLS)";
105 case OR_CONN_STATE_OR_HANDSHAKING
: return "handshaking (Tor)";
106 case OR_CONN_STATE_OPEN
: return "open";
111 case EXIT_CONN_STATE_RESOLVING
: return "waiting for dest info";
112 case EXIT_CONN_STATE_CONNECTING
: return "connecting";
113 case EXIT_CONN_STATE_OPEN
: return "open";
114 case EXIT_CONN_STATE_RESOLVEFAILED
: return "resolve failed";
119 case AP_CONN_STATE_SOCKS_WAIT
: return "waiting for socks info";
120 case AP_CONN_STATE_NATD_WAIT
: return "waiting for natd dest info";
121 case AP_CONN_STATE_RENDDESC_WAIT
: return "waiting for rendezvous desc";
122 case AP_CONN_STATE_CONTROLLER_WAIT
: return "waiting for controller";
123 case AP_CONN_STATE_CIRCUIT_WAIT
: return "waiting for circuit";
124 case AP_CONN_STATE_CONNECT_WAIT
: return "waiting for connect response";
125 case AP_CONN_STATE_RESOLVE_WAIT
: return "waiting for resolve response";
126 case AP_CONN_STATE_OPEN
: return "open";
131 case DIR_CONN_STATE_CONNECTING
: return "connecting";
132 case DIR_CONN_STATE_CLIENT_SENDING
: return "client sending";
133 case DIR_CONN_STATE_CLIENT_READING
: return "client reading";
134 case DIR_CONN_STATE_CLIENT_FINISHED
: return "client finished";
135 case DIR_CONN_STATE_SERVER_COMMAND_WAIT
: return "waiting for command";
136 case DIR_CONN_STATE_SERVER_WRITING
: return "writing";
139 case CONN_TYPE_CPUWORKER
:
141 case CPUWORKER_STATE_IDLE
: return "idle";
142 case CPUWORKER_STATE_BUSY_ONION
: return "busy with onion";
145 case CONN_TYPE_CONTROL
:
147 case CONTROL_CONN_STATE_OPEN
: return "open (protocol v1)";
148 case CONTROL_CONN_STATE_NEEDAUTH
:
149 return "waiting for authentication (protocol v1)";
154 log_warn(LD_BUG
, "unknown connection state %d (type %d)", state
, type
);
155 tor_snprintf(buf
, sizeof(buf
),
156 "unknown state [%d] on unknown [%s] connection",
157 state
, conn_type_to_string(type
));
161 /** Allocate and return a new dir_connection_t, initialized as by
162 * connection_init(). */
164 dir_connection_new(int socket_family
)
166 dir_connection_t
*dir_conn
= tor_malloc_zero(sizeof(dir_connection_t
));
167 connection_init(time(NULL
), TO_CONN(dir_conn
), CONN_TYPE_DIR
, socket_family
);
171 /** Allocate and return a new or_connection_t, initialized as by
172 * connection_init(). */
174 or_connection_new(int socket_family
)
176 or_connection_t
*or_conn
= tor_malloc_zero(sizeof(or_connection_t
));
177 time_t now
= time(NULL
);
178 connection_init(now
, TO_CONN(or_conn
), CONN_TYPE_OR
, socket_family
);
180 or_conn
->timestamp_last_added_nonpadding
= time(NULL
);
181 or_conn
->next_circ_id
= crypto_rand_int(1<<15);
183 or_conn
->active_circuit_pqueue
= smartlist_create();
184 or_conn
->active_circuit_pqueue_last_recalibrated
= cell_ewma_get_tick();
189 /** Allocate and return a new edge_connection_t, initialized as by
190 * connection_init(). */
192 edge_connection_new(int type
, int socket_family
)
194 edge_connection_t
*edge_conn
= tor_malloc_zero(sizeof(edge_connection_t
));
195 tor_assert(type
== CONN_TYPE_EXIT
|| type
== CONN_TYPE_AP
);
196 connection_init(time(NULL
), TO_CONN(edge_conn
), type
, socket_family
);
197 if (type
== CONN_TYPE_AP
)
198 edge_conn
->socks_request
= tor_malloc_zero(sizeof(socks_request_t
));
202 /** Allocate and return a new control_connection_t, initialized as by
203 * connection_init(). */
204 control_connection_t
*
205 control_connection_new(int socket_family
)
207 control_connection_t
*control_conn
=
208 tor_malloc_zero(sizeof(control_connection_t
));
209 connection_init(time(NULL
),
210 TO_CONN(control_conn
), CONN_TYPE_CONTROL
, socket_family
);
214 /** Allocate, initialize, and return a new connection_t subtype of <b>type</b>
215 * to make or receive connections of address family <b>socket_family</b>. The
216 * type should be one of the CONN_TYPE_* constants. */
218 connection_new(int type
, int socket_family
)
222 return TO_CONN(or_connection_new(socket_family
));
226 return TO_CONN(edge_connection_new(type
, socket_family
));
229 return TO_CONN(dir_connection_new(socket_family
));
231 case CONN_TYPE_CONTROL
:
232 return TO_CONN(control_connection_new(socket_family
));
235 connection_t
*conn
= tor_malloc_zero(sizeof(connection_t
));
236 connection_init(time(NULL
), conn
, type
, socket_family
);
242 /** Initializes conn. (you must call connection_add() to link it into the main
245 * Set conn-\>type to <b>type</b>. Set conn-\>s and conn-\>conn_array_index to
246 * -1 to signify they are not yet assigned.
248 * If conn is not a listener type, allocate buffers for it. If it's
249 * an AP type, allocate space to store the socks_request.
251 * Assign a pseudorandom next_circ_id between 0 and 2**15.
253 * Initialize conn's timestamps to now.
256 connection_init(time_t now
, connection_t
*conn
, int type
, int socket_family
)
258 static uint64_t n_connections_allocated
= 1;
262 conn
->magic
= OR_CONNECTION_MAGIC
;
266 conn
->magic
= EDGE_CONNECTION_MAGIC
;
269 conn
->magic
= DIR_CONNECTION_MAGIC
;
271 case CONN_TYPE_CONTROL
:
272 conn
->magic
= CONTROL_CONNECTION_MAGIC
;
275 conn
->magic
= BASE_CONNECTION_MAGIC
;
279 conn
->s
= -1; /* give it a default of 'not used' */
280 conn
->conn_array_index
= -1; /* also default to 'not used' */
281 conn
->global_identifier
= n_connections_allocated
++;
284 conn
->socket_family
= socket_family
;
285 if (!connection_is_listener(conn
)) { /* listeners never use their buf */
286 conn
->inbuf
= buf_new();
287 conn
->outbuf
= buf_new();
290 conn
->timestamp_created
= now
;
291 conn
->timestamp_lastread
= now
;
292 conn
->timestamp_lastwritten
= now
;
295 /** Create a link between <b>conn_a</b> and <b>conn_b</b>. */
297 connection_link_connections(connection_t
*conn_a
, connection_t
*conn_b
)
299 tor_assert(conn_a
->s
< 0);
300 tor_assert(conn_b
->s
< 0);
304 conn_a
->linked_conn
= conn_b
;
305 conn_b
->linked_conn
= conn_a
;
308 /** Deallocate memory used by <b>conn</b>. Deallocate its buffers if
309 * necessary, close its socket if necessary, and mark the directory as dirty
310 * if <b>conn</b> is an OR or OP connection.
313 _connection_free(connection_t
*conn
)
320 switch (conn
->type
) {
322 tor_assert(conn
->magic
== OR_CONNECTION_MAGIC
);
323 mem
= TO_OR_CONN(conn
);
324 memlen
= sizeof(or_connection_t
);
328 tor_assert(conn
->magic
== EDGE_CONNECTION_MAGIC
);
329 mem
= TO_EDGE_CONN(conn
);
330 memlen
= sizeof(edge_connection_t
);
333 tor_assert(conn
->magic
== DIR_CONNECTION_MAGIC
);
334 mem
= TO_DIR_CONN(conn
);
335 memlen
= sizeof(dir_connection_t
);
337 case CONN_TYPE_CONTROL
:
338 tor_assert(conn
->magic
== CONTROL_CONNECTION_MAGIC
);
339 mem
= TO_CONTROL_CONN(conn
);
340 memlen
= sizeof(control_connection_t
);
343 tor_assert(conn
->magic
== BASE_CONNECTION_MAGIC
);
345 memlen
= sizeof(connection_t
);
350 log_info(LD_GENERAL
, "Freeing linked %s connection [%s] with %d "
351 "bytes on inbuf, %d on outbuf.",
352 conn_type_to_string(conn
->type
),
353 conn_state_to_string(conn
->type
, conn
->state
),
354 (int)buf_datalen(conn
->inbuf
), (int)buf_datalen(conn
->outbuf
));
357 if (!connection_is_listener(conn
)) {
358 buf_free(conn
->inbuf
);
359 buf_free(conn
->outbuf
);
361 if (conn
->socket_family
== AF_UNIX
) {
362 /* For now only control ports can be Unix domain sockets
363 * and listeners at the same time */
364 tor_assert(conn
->type
== CONN_TYPE_CONTROL_LISTENER
);
366 if (unlink(conn
->address
) < 0 && errno
!= ENOENT
) {
367 log_warn(LD_NET
, "Could not unlink %s: %s", conn
->address
,
373 tor_free(conn
->address
);
375 if (connection_speaks_cells(conn
)) {
376 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
377 tor_tls_free(or_conn
->tls
);
379 or_handshake_state_free(or_conn
->handshake_state
);
380 or_conn
->handshake_state
= NULL
;
381 smartlist_free(or_conn
->active_circuit_pqueue
);
382 tor_free(or_conn
->nickname
);
384 if (CONN_IS_EDGE(conn
)) {
385 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
386 tor_free(edge_conn
->chosen_exit_name
);
387 if (edge_conn
->socks_request
) {
388 memset(edge_conn
->socks_request
, 0xcc, sizeof(socks_request_t
));
389 tor_free(edge_conn
->socks_request
);
392 rend_data_free(edge_conn
->rend_data
);
394 if (conn
->type
== CONN_TYPE_CONTROL
) {
395 control_connection_t
*control_conn
= TO_CONTROL_CONN(conn
);
396 tor_free(control_conn
->incoming_cmd
);
399 tor_free(conn
->read_event
); /* Probably already freed by connection_free. */
400 tor_free(conn
->write_event
); /* Probably already freed by connection_free. */
402 if (conn
->type
== CONN_TYPE_DIR
) {
403 dir_connection_t
*dir_conn
= TO_DIR_CONN(conn
);
404 tor_free(dir_conn
->requested_resource
);
406 tor_zlib_free(dir_conn
->zlib_state
);
407 if (dir_conn
->fingerprint_stack
) {
408 SMARTLIST_FOREACH(dir_conn
->fingerprint_stack
, char *, cp
, tor_free(cp
));
409 smartlist_free(dir_conn
->fingerprint_stack
);
412 cached_dir_decref(dir_conn
->cached_dir
);
413 rend_data_free(dir_conn
->rend_data
);
417 log_debug(LD_NET
,"closing fd %d.",conn
->s
);
418 tor_close_socket(conn
->s
);
422 if (conn
->type
== CONN_TYPE_OR
&&
423 !tor_digest_is_zero(TO_OR_CONN(conn
)->identity_digest
)) {
424 log_warn(LD_BUG
, "called on OR conn with non-zeroed identity_digest");
425 connection_or_remove_from_identity_map(TO_OR_CONN(conn
));
428 memset(mem
, 0xCC, memlen
); /* poison memory */
432 /** Make sure <b>conn</b> isn't in any of the global conn lists; then free it.
435 connection_free(connection_t
*conn
)
439 tor_assert(!connection_is_on_closeable_list(conn
));
440 tor_assert(!connection_in_array(conn
));
441 if (conn
->linked_conn
) {
442 log_err(LD_BUG
, "Called with conn->linked_conn still set.");
443 tor_fragile_assert();
444 conn
->linked_conn
->linked_conn
= NULL
;
445 if (! conn
->linked_conn
->marked_for_close
&&
446 conn
->linked_conn
->reading_from_linked_conn
)
447 connection_start_reading(conn
->linked_conn
);
448 conn
->linked_conn
= NULL
;
450 if (connection_speaks_cells(conn
)) {
451 if (!tor_digest_is_zero(TO_OR_CONN(conn
)->identity_digest
)) {
452 connection_or_remove_from_identity_map(TO_OR_CONN(conn
));
455 if (conn
->type
== CONN_TYPE_CONTROL
) {
456 TO_CONTROL_CONN(conn
)->event_mask
= 0;
457 control_update_global_event_mask();
459 connection_unregister_events(conn
);
460 _connection_free(conn
);
463 /** Call _connection_free() on every connection in our array, and release all
464 * storage held by connection.c. This is used by cpuworkers and dnsworkers
465 * when they fork, so they don't keep resources held open (especially
468 * Don't do the checks in connection_free(), because they will
472 connection_free_all(void)
474 smartlist_t
*conns
= get_connection_array();
476 /* We don't want to log any messages to controllers. */
477 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
478 if (conn
->type
== CONN_TYPE_CONTROL
)
479 TO_CONTROL_CONN(conn
)->event_mask
= 0);
481 control_update_global_event_mask();
483 /* Unlink everything from the identity map. */
484 connection_or_clear_identity_map();
486 SMARTLIST_FOREACH(conns
, connection_t
*, conn
, _connection_free(conn
));
488 if (outgoing_addrs
) {
489 SMARTLIST_FOREACH(outgoing_addrs
, void*, addr
, tor_free(addr
));
490 smartlist_free(outgoing_addrs
);
491 outgoing_addrs
= NULL
;
495 /** Do any cleanup needed:
496 * - Directory conns that failed to fetch a rendezvous descriptor
497 * need to inform pending rendezvous streams.
498 * - OR conns need to call rep_hist_note_*() to record status.
499 * - AP conns need to send a socks reject if necessary.
500 * - Exit conns need to call connection_dns_remove() if necessary.
501 * - AP and Exit conns need to send an end cell if they can.
502 * - DNS conns need to fail any resolves that are pending on them.
503 * - OR and edge connections need to be unlinked from circuits.
506 connection_about_to_close_connection(connection_t
*conn
)
509 dir_connection_t
*dir_conn
;
510 or_connection_t
*or_conn
;
511 edge_connection_t
*edge_conn
;
512 time_t now
= time(NULL
);
514 tor_assert(conn
->marked_for_close
);
516 if (CONN_IS_EDGE(conn
)) {
517 edge_conn
= TO_EDGE_CONN(conn
);
518 if (!edge_conn
->edge_has_sent_end
) {
519 log_warn(LD_BUG
, "(Harmless.) Edge connection (marked at %s:%d) "
520 "hasn't sent end yet?",
521 conn
->marked_for_close_file
, conn
->marked_for_close
);
522 tor_fragile_assert();
526 switch (conn
->type
) {
528 dir_conn
= TO_DIR_CONN(conn
);
529 if (conn
->state
< DIR_CONN_STATE_CLIENT_FINISHED
) {
530 /* It's a directory connection and connecting or fetching
531 * failed: forget about this router, and maybe try again. */
532 connection_dir_request_failed(dir_conn
);
534 /* If we were trying to fetch a v2 rend desc and did not succeed,
535 * retry as needed. (If a fetch is successful, the connection state
536 * is changed to DIR_PURPOSE_HAS_FETCHED_RENDDESC to mark that
537 * refetching is unnecessary.) */
538 if (conn
->purpose
== DIR_PURPOSE_FETCH_RENDDESC_V2
&&
539 dir_conn
->rend_data
&&
540 strlen(dir_conn
->rend_data
->onion_address
) ==
541 REND_SERVICE_ID_LEN_BASE32
)
542 rend_client_refetch_v2_renddesc(dir_conn
->rend_data
);
545 or_conn
= TO_OR_CONN(conn
);
546 /* Remember why we're closing this connection. */
547 if (conn
->state
!= OR_CONN_STATE_OPEN
) {
548 /* Inform any pending (not attached) circs that they should
550 circuit_n_conn_done(TO_OR_CONN(conn
), 0);
551 /* now mark things down as needed */
552 if (connection_or_nonopen_was_started_here(or_conn
)) {
553 or_options_t
*options
= get_options();
554 rep_hist_note_connect_failed(or_conn
->identity_digest
, now
);
555 entry_guard_register_connect_status(or_conn
->identity_digest
,0,
556 !options
->HttpsProxy
, now
);
557 if (conn
->state
>= OR_CONN_STATE_TLS_HANDSHAKING
) {
558 int reason
= tls_error_to_orconn_end_reason(or_conn
->tls_error
);
559 control_event_or_conn_status(or_conn
, OR_CONN_EVENT_FAILED
,
561 if (!authdir_mode_tests_reachability(options
))
562 control_event_bootstrap_problem(
563 orconn_end_reason_to_control_string(reason
), reason
);
566 } else if (conn
->hold_open_until_flushed
) {
567 /* We only set hold_open_until_flushed when we're intentionally
568 * closing a connection. */
569 rep_hist_note_disconnect(or_conn
->identity_digest
, now
);
570 control_event_or_conn_status(or_conn
, OR_CONN_EVENT_CLOSED
,
571 tls_error_to_orconn_end_reason(or_conn
->tls_error
));
572 } else if (!tor_digest_is_zero(or_conn
->identity_digest
)) {
573 rep_hist_note_connection_died(or_conn
->identity_digest
, now
);
574 control_event_or_conn_status(or_conn
, OR_CONN_EVENT_CLOSED
,
575 tls_error_to_orconn_end_reason(or_conn
->tls_error
));
577 /* Now close all the attached circuits on it. */
578 circuit_unlink_all_from_or_conn(TO_OR_CONN(conn
),
579 END_CIRC_REASON_OR_CONN_CLOSED
);
582 edge_conn
= TO_EDGE_CONN(conn
);
583 if (edge_conn
->socks_request
->has_finished
== 0) {
584 /* since conn gets removed right after this function finishes,
585 * there's no point trying to send back a reply at this point. */
586 log_warn(LD_BUG
,"Closing stream (marked at %s:%d) without sending"
587 " back a socks reply.",
588 conn
->marked_for_close_file
, conn
->marked_for_close
);
590 if (!edge_conn
->end_reason
) {
591 log_warn(LD_BUG
,"Closing stream (marked at %s:%d) without having"
593 conn
->marked_for_close_file
, conn
->marked_for_close
);
595 if (edge_conn
->dns_server_request
) {
596 log_warn(LD_BUG
,"Closing stream (marked at %s:%d) without having"
597 " replied to DNS request.",
598 conn
->marked_for_close_file
, conn
->marked_for_close
);
599 dnsserv_reject_request(edge_conn
);
601 control_event_stream_bandwidth(edge_conn
);
602 control_event_stream_status(edge_conn
, STREAM_EVENT_CLOSED
,
603 edge_conn
->end_reason
);
604 circ
= circuit_get_by_edge_conn(edge_conn
);
606 circuit_detach_stream(circ
, edge_conn
);
609 edge_conn
= TO_EDGE_CONN(conn
);
610 circ
= circuit_get_by_edge_conn(edge_conn
);
612 circuit_detach_stream(circ
, edge_conn
);
613 if (conn
->state
== EXIT_CONN_STATE_RESOLVING
) {
614 connection_dns_remove(edge_conn
);
620 /** Return true iff connection_close_immediate() has been called on this
622 #define CONN_IS_CLOSED(c) \
623 ((c)->linked ? ((c)->linked_conn_is_closed) : ((c)->s < 0))
625 /** Close the underlying socket for <b>conn</b>, so we don't try to
626 * flush it. Must be used in conjunction with (right before)
627 * connection_mark_for_close().
630 connection_close_immediate(connection_t
*conn
)
632 assert_connection_ok(conn
,0);
633 if (CONN_IS_CLOSED(conn
)) {
634 log_err(LD_BUG
,"Attempt to close already-closed connection.");
635 tor_fragile_assert();
638 if (conn
->outbuf_flushlen
) {
639 log_info(LD_NET
,"fd %d, type %s, state %s, %d bytes on outbuf.",
640 conn
->s
, conn_type_to_string(conn
->type
),
641 conn_state_to_string(conn
->type
, conn
->state
),
642 (int)conn
->outbuf_flushlen
);
645 connection_unregister_events(conn
);
648 tor_close_socket(conn
->s
);
651 conn
->linked_conn_is_closed
= 1;
652 if (!connection_is_listener(conn
)) {
653 buf_clear(conn
->outbuf
);
654 conn
->outbuf_flushlen
= 0;
658 /** Mark <b>conn</b> to be closed next time we loop through
659 * conn_close_if_marked() in main.c. */
661 _connection_mark_for_close(connection_t
*conn
, int line
, const char *file
)
663 assert_connection_ok(conn
,0);
665 tor_assert(line
< 1<<16); /* marked_for_close can only fit a uint16_t. */
668 if (conn
->marked_for_close
) {
669 log(LOG_WARN
,LD_BUG
,"Duplicate call to connection_mark_for_close at %s:%d"
670 " (first at %s:%d)", file
, line
, conn
->marked_for_close_file
,
671 conn
->marked_for_close
);
672 tor_fragile_assert();
676 conn
->marked_for_close
= line
;
677 conn
->marked_for_close_file
= file
;
678 add_connection_to_closeable_list(conn
);
680 /* in case we're going to be held-open-til-flushed, reset
681 * the number of seconds since last successful write, so
682 * we get our whole 15 seconds */
683 conn
->timestamp_lastwritten
= time(NULL
);
686 /** Find each connection that has hold_open_until_flushed set to
687 * 1 but hasn't written in the past 15 seconds, and set
688 * hold_open_until_flushed to 0. This means it will get cleaned
689 * up in the next loop through close_if_marked() in main.c.
692 connection_expire_held_open(void)
695 smartlist_t
*conns
= get_connection_array();
699 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
701 /* If we've been holding the connection open, but we haven't written
704 if (conn
->hold_open_until_flushed
) {
705 tor_assert(conn
->marked_for_close
);
706 if (now
- conn
->timestamp_lastwritten
>= 15) {
708 if (conn
->type
== CONN_TYPE_EXIT
||
709 (conn
->type
== CONN_TYPE_DIR
&&
710 conn
->purpose
== DIR_PURPOSE_SERVER
))
713 severity
= LOG_NOTICE
;
714 log_fn(severity
, LD_NET
,
715 "Giving up on marked_for_close conn that's been flushing "
716 "for 15s (fd %d, type %s, state %s).",
717 conn
->s
, conn_type_to_string(conn
->type
),
718 conn_state_to_string(conn
->type
, conn
->state
));
719 conn
->hold_open_until_flushed
= 0;
725 /** Create an AF_INET listenaddr struct.
726 * <b>listenaddress</b> provides the host and optionally the port information
727 * for the new structure. If no port is provided in <b>listenaddress</b> then
728 * <b>listenport</b> is used.
730 * If not NULL <b>readable_address</b> will contain a copy of the host part of
731 * <b>listenaddress</b>.
733 * The listenaddr struct has to be freed by the caller.
735 static struct sockaddr_in
*
736 create_inet_sockaddr(const char *listenaddress
, uint16_t listenport
,
737 char **readable_address
, socklen_t
*socklen_out
) {
738 struct sockaddr_in
*listenaddr
= NULL
;
740 uint16_t usePort
= 0;
742 if (parse_addr_port(LOG_WARN
,
743 listenaddress
, readable_address
, &addr
, &usePort
)<0) {
745 "Error parsing/resolving ListenAddress %s", listenaddress
);
749 usePort
= listenport
;
751 listenaddr
= tor_malloc_zero(sizeof(struct sockaddr_in
));
752 listenaddr
->sin_addr
.s_addr
= htonl(addr
);
753 listenaddr
->sin_family
= AF_INET
;
754 listenaddr
->sin_port
= htons((uint16_t) usePort
);
756 *socklen_out
= sizeof(struct sockaddr_in
);
761 tor_free(listenaddr
);
766 /** Create an AF_UNIX listenaddr struct.
767 * <b>listenaddress</b> provides the path to the Unix socket.
769 * Eventually <b>listenaddress</b> will also optionally contain user, group,
770 * and file permissions for the new socket. But not yet. XXX
771 * Also, since we do not create the socket here the information doesn't help
774 * If not NULL <b>readable_address</b> will contain a copy of the path part of
775 * <b>listenaddress</b>.
777 * The listenaddr struct has to be freed by the caller.
779 static struct sockaddr_un
*
780 create_unix_sockaddr(const char *listenaddress
, char **readable_address
,
783 struct sockaddr_un
*sockaddr
= NULL
;
785 sockaddr
= tor_malloc_zero(sizeof(struct sockaddr_un
));
786 sockaddr
->sun_family
= AF_UNIX
;
787 strncpy(sockaddr
->sun_path
, listenaddress
, sizeof(sockaddr
->sun_path
));
789 if (readable_address
)
790 *readable_address
= tor_strdup(listenaddress
);
792 *len_out
= sizeof(struct sockaddr_un
);
796 static struct sockaddr
*
797 create_unix_sockaddr(const char *listenaddress
, char **readable_address
,
801 (void)readable_address
;
802 log_fn(LOG_ERR
, LD_BUG
,
803 "Unix domain sockets not supported, yet we tried to create one.");
807 #endif /* HAVE_SYS_UN_H */
809 /** Warn that an accept or a connect has failed because we're running up
810 * against our ulimit. Rate-limit these warnings so that we don't spam
813 warn_too_many_conns(void)
815 #define WARN_TOO_MANY_CONNS_INTERVAL (6*60*60)
816 static time_t last_warned
= 0;
817 time_t now
= time(NULL
);
818 int n_conns
= get_n_open_sockets();
819 if (last_warned
+ WARN_TOO_MANY_CONNS_INTERVAL
< now
) {
820 log_warn(LD_NET
,"Failing because we have %d connections already. Please "
821 "raise your ulimit -n.", n_conns
);
824 control_event_general_status(LOG_WARN
, "TOO_MANY_CONNECTIONS CURRENT=%d",
828 /** Bind a new non-blocking socket listening to the socket described
829 * by <b>listensockaddr</b>.
831 * <b>address</b> is only used for logging purposes and to add the information
834 static connection_t
*
835 connection_create_listener(struct sockaddr
*listensockaddr
, socklen_t socklen
,
836 int type
, char* address
)
839 int s
; /* the socket we're going to make */
840 uint16_t usePort
= 0;
841 int start_reading
= 0;
843 if (get_n_open_sockets() >= get_options()->_ConnLimit
-1) {
844 warn_too_many_conns();
848 if (listensockaddr
->sa_family
== AF_INET
) {
849 int is_tcp
= (type
!= CONN_TYPE_AP_DNS_LISTENER
);
856 usePort
= ntohs( (uint16_t)
857 ((struct sockaddr_in
*)listensockaddr
)->sin_port
);
859 log_notice(LD_NET
, "Opening %s on %s:%d",
860 conn_type_to_string(type
), address
, usePort
);
862 s
= tor_open_socket(PF_INET
,
863 is_tcp
? SOCK_STREAM
: SOCK_DGRAM
,
864 is_tcp
? IPPROTO_TCP
: IPPROTO_UDP
);
866 log_warn(LD_NET
,"Socket creation failed.");
871 /* REUSEADDR on normal places means you can rebind to the port
872 * right after somebody else has let it go. But REUSEADDR on win32
873 * means you can bind to the port _even when somebody else
874 * already has it bound_. So, don't do that on Win32. */
875 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (void*) &one
,
876 (socklen_t
)sizeof(one
));
879 if (bind(s
,listensockaddr
,socklen
) < 0) {
880 const char *helpfulhint
= "";
881 int e
= tor_socket_errno(s
);
882 if (ERRNO_IS_EADDRINUSE(e
))
883 helpfulhint
= ". Is Tor already running?";
884 log_warn(LD_NET
, "Could not bind to %s:%u: %s%s", address
, usePort
,
885 tor_socket_strerror(e
), helpfulhint
);
891 if (listen(s
,SOMAXCONN
) < 0) {
892 log_warn(LD_NET
, "Could not listen on %s:%u: %s", address
, usePort
,
893 tor_socket_strerror(tor_socket_errno(s
)));
899 } else if (listensockaddr
->sa_family
== AF_UNIX
) {
902 /* For now only control ports can be Unix domain sockets
903 * and listeners at the same time */
904 tor_assert(type
== CONN_TYPE_CONTROL_LISTENER
);
906 log_notice(LD_NET
, "Opening %s on %s",
907 conn_type_to_string(type
), address
);
909 if (unlink(address
) < 0 && errno
!= ENOENT
) {
910 log_warn(LD_NET
, "Could not unlink %s: %s", address
,
914 s
= tor_open_socket(AF_UNIX
, SOCK_STREAM
, 0);
916 log_warn(LD_NET
,"Socket creation failed: %s.", strerror(errno
));
920 if (bind(s
, listensockaddr
, (socklen_t
)sizeof(struct sockaddr_un
)) == -1) {
921 log_warn(LD_NET
,"Bind to %s failed: %s.", address
,
922 tor_socket_strerror(tor_socket_errno(s
)));
926 if (listen(s
,SOMAXCONN
) < 0) {
927 log_warn(LD_NET
, "Could not listen on %s: %s", address
,
928 tor_socket_strerror(tor_socket_errno(s
)));
932 #endif /* HAVE_SYS_UN_H */
934 log_err(LD_BUG
,"Got unexpected address family %d.",
935 listensockaddr
->sa_family
);
939 set_socket_nonblocking(s
);
941 conn
= connection_new(type
, listensockaddr
->sa_family
);
942 conn
->socket_family
= listensockaddr
->sa_family
;
944 conn
->address
= tor_strdup(address
);
945 conn
->port
= usePort
;
947 if (connection_add(conn
) < 0) { /* no space, forget it */
948 log_warn(LD_NET
,"connection_add for listener failed. Giving up.");
949 connection_free(conn
);
953 log_debug(LD_NET
,"%s listening on port %u.",
954 conn_type_to_string(type
), usePort
);
956 conn
->state
= LISTENER_STATE_READY
;
958 connection_start_reading(conn
);
960 tor_assert(type
== CONN_TYPE_AP_DNS_LISTENER
);
961 dnsserv_configure_listener(conn
);
970 /** Do basic sanity checking on a newly received socket. Return 0
971 * if it looks ok, else return -1. */
973 check_sockaddr(struct sockaddr
*sa
, int len
, int level
)
977 if (sa
->sa_family
== AF_INET
) {
978 struct sockaddr_in
*sin
=(struct sockaddr_in
*)sa
;
979 if (len
!= sizeof(struct sockaddr_in
)) {
980 log_fn(level
, LD_NET
, "Length of address not as expected: %d vs %d",
981 len
,(int)sizeof(struct sockaddr_in
));
984 if (sin
->sin_addr
.s_addr
== 0 || sin
->sin_port
== 0) {
985 log_fn(level
, LD_NET
,
986 "Address for new connection has address/port equal to zero.");
989 } else if (sa
->sa_family
== AF_INET6
) {
990 struct sockaddr_in6
*sin6
=(struct sockaddr_in6
*)sa
;
991 if (len
!= sizeof(struct sockaddr_in6
)) {
992 log_fn(level
, LD_NET
, "Length of address not as expected: %d vs %d",
993 len
,(int)sizeof(struct sockaddr_in6
));
996 if (tor_mem_is_zero((void*)sin6
->sin6_addr
.s6_addr
, 16) ||
997 sin6
->sin6_port
== 0) {
998 log_fn(level
, LD_NET
,
999 "Address for new connection has address/port equal to zero.");
1008 /** Check whether the socket family from an accepted socket <b>got</b> is the
1009 * same as the one that <b>listener</b> is waiting for. If it isn't, log
1010 * a useful message and return -1. Else return 0.
1012 * This is annoying, but can apparently happen on some Darwins. */
1014 check_sockaddr_family_match(sa_family_t got
, connection_t
*listener
)
1016 if (got
!= listener
->socket_family
) {
1017 log_info(LD_BUG
, "A listener connection returned a socket with a "
1018 "mismatched family. %s for addr_family %d gave us a socket "
1019 "with address family %d. Dropping.",
1020 conn_type_to_string(listener
->type
),
1021 (int)listener
->socket_family
,
1028 /** The listener connection <b>conn</b> told poll() it wanted to read.
1029 * Call accept() on conn-\>s, and add the new connection if necessary.
1032 connection_handle_listener_read(connection_t
*conn
, int new_type
)
1034 int news
; /* the new socket */
1035 connection_t
*newconn
;
1036 /* information about the remote peer when connecting to other routers */
1038 struct sockaddr
*remote
= (struct sockaddr
*)addrbuf
;
1039 /* length of the remote address. Must be whatever accept() needs. */
1040 socklen_t remotelen
= (socklen_t
)sizeof(addrbuf
);
1041 or_options_t
*options
= get_options();
1043 tor_assert((size_t)remotelen
>= sizeof(struct sockaddr_in
));
1044 memset(addrbuf
, 0, sizeof(addrbuf
));
1046 news
= tor_accept_socket(conn
->s
,remote
,&remotelen
);
1047 if (news
< 0) { /* accept() error */
1048 int e
= tor_socket_errno(conn
->s
);
1049 if (ERRNO_IS_ACCEPT_EAGAIN(e
)) {
1050 return 0; /* he hung up before we could accept(). that's fine. */
1051 } else if (ERRNO_IS_ACCEPT_RESOURCE_LIMIT(e
)) {
1052 warn_too_many_conns();
1055 /* else there was a real error. */
1056 log_warn(LD_NET
,"accept() failed: %s. Closing listener.",
1057 tor_socket_strerror(e
));
1058 connection_mark_for_close(conn
);
1062 "Connection accepted on socket %d (child of fd %d).",
1065 set_socket_nonblocking(news
);
1067 if (options
->ConstrainedSockets
)
1068 set_constrained_socket_buffers(news
, (int)options
->ConstrainedSockSize
);
1070 if (check_sockaddr_family_match(remote
->sa_family
, conn
) < 0) {
1071 tor_close_socket(news
);
1075 if (conn
->socket_family
== AF_INET
|| conn
->socket_family
== AF_INET6
) {
1078 if (check_sockaddr(remote
, remotelen
, LOG_INFO
)<0) {
1080 "accept() returned a strange address; trying getsockname().");
1081 remotelen
=sizeof(addrbuf
);
1082 memset(addrbuf
, 0, sizeof(addrbuf
));
1083 if (getsockname(news
, remote
, &remotelen
)<0) {
1084 int e
= tor_socket_errno(news
);
1085 log_warn(LD_NET
, "getsockname() for new connection failed: %s",
1086 tor_socket_strerror(e
));
1088 if (check_sockaddr((struct sockaddr
*)addrbuf
, remotelen
,
1090 log_warn(LD_NET
,"Something's wrong with this conn. Closing it.");
1091 tor_close_socket(news
);
1097 if (check_sockaddr_family_match(remote
->sa_family
, conn
) < 0) {
1098 tor_close_socket(news
);
1102 tor_addr_from_sockaddr(&addr
, remote
, &port
);
1104 /* process entrance policies here, before we even create the connection */
1105 if (new_type
== CONN_TYPE_AP
) {
1106 /* check sockspolicy to see if we should accept it */
1107 if (socks_policy_permits_address(&addr
) == 0) {
1109 "Denying socks connection from untrusted address %s.",
1111 tor_close_socket(news
);
1115 if (new_type
== CONN_TYPE_DIR
) {
1116 /* check dirpolicy to see if we should accept it */
1117 if (dir_policy_permits_address(&addr
) == 0) {
1118 log_notice(LD_DIRSERV
,"Denying dir connection from address %s.",
1120 tor_close_socket(news
);
1125 newconn
= connection_new(new_type
, conn
->socket_family
);
1128 /* remember the remote address */
1129 tor_addr_copy(&newconn
->addr
, &addr
);
1130 newconn
->port
= port
;
1131 newconn
->address
= tor_dup_addr(&addr
);
1133 } else if (conn
->socket_family
== AF_UNIX
) {
1134 /* For now only control ports can be Unix domain sockets
1135 * and listeners at the same time */
1136 tor_assert(conn
->type
== CONN_TYPE_CONTROL_LISTENER
);
1138 newconn
= connection_new(new_type
, conn
->socket_family
);
1141 /* remember the remote address -- do we have anything sane to put here? */
1142 tor_addr_make_unspec(&newconn
->addr
);
1144 newconn
->address
= tor_strdup(conn
->address
);
1149 if (connection_add(newconn
) < 0) { /* no space, forget it */
1150 connection_free(newconn
);
1151 return 0; /* no need to tear down the parent */
1154 if (connection_init_accepted_conn(newconn
, conn
->type
) < 0) {
1155 connection_mark_for_close(newconn
);
1161 /** Initialize states for newly accepted connection <b>conn</b>.
1162 * If conn is an OR, start the TLS handshake.
1163 * If conn is a transparent AP, get its original destination
1164 * and place it in circuit_wait.
1167 connection_init_accepted_conn(connection_t
*conn
, uint8_t listener_type
)
1169 connection_start_reading(conn
);
1171 switch (conn
->type
) {
1173 control_event_or_conn_status(TO_OR_CONN(conn
), OR_CONN_EVENT_NEW
, 0);
1174 return connection_tls_start_handshake(TO_OR_CONN(conn
), 1);
1176 switch (listener_type
) {
1177 case CONN_TYPE_AP_LISTENER
:
1178 conn
->state
= AP_CONN_STATE_SOCKS_WAIT
;
1180 case CONN_TYPE_AP_TRANS_LISTENER
:
1181 conn
->state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1182 return connection_ap_process_transparent(TO_EDGE_CONN(conn
));
1183 case CONN_TYPE_AP_NATD_LISTENER
:
1184 conn
->state
= AP_CONN_STATE_NATD_WAIT
;
1189 conn
->purpose
= DIR_PURPOSE_SERVER
;
1190 conn
->state
= DIR_CONN_STATE_SERVER_COMMAND_WAIT
;
1192 case CONN_TYPE_CONTROL
:
1193 conn
->state
= CONTROL_CONN_STATE_NEEDAUTH
;
1199 /** Take conn, make a nonblocking socket; try to connect to
1200 * addr:port (they arrive in *host order*). If fail, return -1 and if
1201 * applicable put your best guess about errno into *<b>socket_error</b>.
1202 * Else assign s to conn-\>s: if connected return 1, if EAGAIN return 0.
1204 * address is used to make the logs useful.
1206 * On success, add conn to the list of polled connections.
1209 connection_connect(connection_t
*conn
, const char *address
,
1210 const tor_addr_t
*addr
, uint16_t port
, int *socket_error
)
1212 int s
, inprogress
= 0;
1214 struct sockaddr
*dest_addr
= (struct sockaddr
*) addrbuf
;
1215 socklen_t dest_addr_len
;
1216 or_options_t
*options
= get_options();
1217 int protocol_family
;
1219 if (get_n_open_sockets() >= get_options()->_ConnLimit
-1) {
1220 warn_too_many_conns();
1224 if (tor_addr_family(addr
) == AF_INET6
)
1225 protocol_family
= PF_INET6
;
1227 protocol_family
= PF_INET
;
1229 s
= tor_open_socket(protocol_family
,SOCK_STREAM
,IPPROTO_TCP
);
1231 *socket_error
= tor_socket_errno(-1);
1232 log_warn(LD_NET
,"Error creating network socket: %s",
1233 tor_socket_strerror(*socket_error
));
1237 if (options
->OutboundBindAddress
) {
1238 struct sockaddr_in ext_addr
;
1240 memset(&ext_addr
, 0, sizeof(ext_addr
));
1241 ext_addr
.sin_family
= AF_INET
;
1242 ext_addr
.sin_port
= 0;
1243 if (!tor_inet_aton(options
->OutboundBindAddress
, &ext_addr
.sin_addr
)) {
1244 log_warn(LD_CONFIG
,"Outbound bind address '%s' didn't parse. Ignoring.",
1245 options
->OutboundBindAddress
);
1247 if (bind(s
, (struct sockaddr
*)&ext_addr
,
1248 (socklen_t
)sizeof(ext_addr
)) < 0) {
1249 *socket_error
= tor_socket_errno(s
);
1250 log_warn(LD_NET
,"Error binding network socket: %s",
1251 tor_socket_strerror(*socket_error
));
1252 tor_close_socket(s
);
1258 set_socket_nonblocking(s
);
1260 if (options
->ConstrainedSockets
)
1261 set_constrained_socket_buffers(s
, (int)options
->ConstrainedSockSize
);
1263 memset(addrbuf
,0,sizeof(addrbuf
));
1264 dest_addr
= (struct sockaddr
*) addrbuf
;
1265 dest_addr_len
= tor_addr_to_sockaddr(addr
, port
, dest_addr
, sizeof(addrbuf
));
1266 tor_assert(dest_addr_len
> 0);
1268 log_debug(LD_NET
,"Connecting to %s:%u.",escaped_safe_str(address
),port
);
1270 if (connect(s
, dest_addr
, dest_addr_len
) < 0) {
1271 int e
= tor_socket_errno(s
);
1272 if (!ERRNO_IS_CONN_EINPROGRESS(e
)) {
1273 /* yuck. kill it. */
1276 "connect() to %s:%u failed: %s",escaped_safe_str(address
),
1277 port
, tor_socket_strerror(e
));
1278 tor_close_socket(s
);
1285 if (!server_mode(options
))
1286 client_check_address_changed(s
);
1288 /* it succeeded. we're connected. */
1289 log_fn(inprogress
?LOG_DEBUG
:LOG_INFO
, LD_NET
,
1290 "Connection to %s:%u %s (sock %d).",escaped_safe_str(address
),
1291 port
, inprogress
?"in progress":"established", s
);
1293 if (connection_add(conn
) < 0) /* no space, forget it */
1295 return inprogress
? 0 : 1;
1298 /** Convert state number to string representation for logging purposes.
1301 connection_proxy_state_to_string(int state
)
1303 static const char *unknown
= "???";
1304 static const char *states
[] = {
1306 "PROXY_HTTPS_WANT_CONNECT_OK",
1307 "PROXY_SOCKS4_WANT_CONNECT_OK",
1308 "PROXY_SOCKS5_WANT_AUTH_METHOD_NONE",
1309 "PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929",
1310 "PROXY_SOCKS5_WANT_AUTH_RFC1929_OK",
1311 "PROXY_SOCKS5_WANT_CONNECT_OK",
1315 if (state
< PROXY_NONE
|| state
> PROXY_CONNECTED
)
1318 return states
[state
];
1321 /** Write a proxy request of <b>type</b> (socks4, socks5, https) to conn
1322 * for conn->addr:conn->port, authenticating with the auth details given
1323 * in the configuration (if available). SOCKS 5 and HTTP CONNECT proxies
1324 * support authentication.
1326 * Returns -1 if conn->addr is incompatible with the proxy protocol, and
1329 * Use connection_read_proxy_handshake() to complete the handshake.
1332 connection_proxy_connect(connection_t
*conn
, int type
)
1334 or_options_t
*options
;
1338 options
= get_options();
1341 case PROXY_CONNECT
: {
1343 char *base64_authenticator
=NULL
;
1344 const char *authenticator
= options
->HttpsProxyAuthenticator
;
1346 /* Send HTTP CONNECT and authentication (if available) in
1349 if (authenticator
) {
1350 base64_authenticator
= alloc_http_authenticator(authenticator
);
1351 if (!base64_authenticator
)
1352 log_warn(LD_OR
, "Encoding https authenticator failed");
1355 if (base64_authenticator
) {
1356 tor_snprintf(buf
, sizeof(buf
), "CONNECT %s:%d HTTP/1.1\r\n"
1357 "Proxy-Authorization: Basic %s\r\n\r\n",
1358 fmt_addr(&conn
->addr
),
1359 conn
->port
, base64_authenticator
);
1360 tor_free(base64_authenticator
);
1362 tor_snprintf(buf
, sizeof(buf
), "CONNECT %s:%d HTTP/1.0\r\n\r\n",
1363 fmt_addr(&conn
->addr
), conn
->port
);
1366 connection_write_to_buf(buf
, strlen(buf
), conn
);
1367 conn
->proxy_state
= PROXY_HTTPS_WANT_CONNECT_OK
;
1371 case PROXY_SOCKS4
: {
1372 unsigned char buf
[9];
1376 /* Send a SOCKS4 connect request with empty user id */
1378 if (tor_addr_family(&conn
->addr
) != AF_INET
) {
1379 log_warn(LD_NET
, "SOCKS4 client is incompatible with with IPv6");
1383 ip4addr
= tor_addr_to_ipv4n(&conn
->addr
);
1384 portn
= htons(conn
->port
);
1386 buf
[0] = 4; /* version */
1387 buf
[1] = SOCKS_COMMAND_CONNECT
; /* command */
1388 memcpy(buf
+ 2, &portn
, 2); /* port */
1389 memcpy(buf
+ 4, &ip4addr
, 4); /* addr */
1390 buf
[8] = 0; /* userid (empty) */
1392 connection_write_to_buf((char *)buf
, sizeof(buf
), conn
);
1393 conn
->proxy_state
= PROXY_SOCKS4_WANT_CONNECT_OK
;
1397 case PROXY_SOCKS5
: {
1398 unsigned char buf
[4]; /* fields: vers, num methods, method list */
1400 /* Send a SOCKS5 greeting (connect request must wait) */
1402 buf
[0] = 5; /* version */
1404 /* number of auth methods */
1405 if (options
->Socks5ProxyUsername
) {
1407 buf
[2] = 0x00; /* no authentication */
1408 buf
[3] = 0x02; /* rfc1929 Username/Passwd auth */
1409 conn
->proxy_state
= PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929
;
1412 buf
[2] = 0x00; /* no authentication */
1413 conn
->proxy_state
= PROXY_SOCKS5_WANT_AUTH_METHOD_NONE
;
1416 connection_write_to_buf((char *)buf
, 2 + buf
[1], conn
);
1421 log_err(LD_BUG
, "Invalid proxy protocol, %d", type
);
1422 tor_fragile_assert();
1426 log_debug(LD_NET
, "set state %s",
1427 connection_proxy_state_to_string(conn
->proxy_state
));
1432 /** Read conn's inbuf. If the http response from the proxy is all
1433 * here, make sure it's good news, then return 1. If it's bad news,
1434 * return -1. Else return 0 and hope for better luck next time.
1437 connection_read_https_proxy_response(connection_t
*conn
)
1444 switch (fetch_from_buf_http(conn
->inbuf
,
1445 &headers
, MAX_HEADERS_SIZE
,
1446 NULL
, NULL
, 10000, 0)) {
1447 case -1: /* overflow */
1448 log_warn(LD_PROTOCOL
,
1449 "Your https proxy sent back an oversized response. Closing.");
1452 log_info(LD_NET
,"https proxy response not all here yet. Waiting.");
1454 /* case 1, fall through */
1457 if (parse_http_response(headers
, &status_code
, &date_header
,
1458 NULL
, &reason
) < 0) {
1460 "Unparseable headers from proxy (connecting to '%s'). Closing.",
1465 if (!reason
) reason
= tor_strdup("[no reason given]");
1467 if (status_code
== 200) {
1469 "HTTPS connect to '%s' successful! (200 %s) Starting TLS.",
1470 conn
->address
, escaped(reason
));
1474 /* else, bad news on the status code */
1476 "The https proxy sent back an unexpected status code %d (%s). "
1478 status_code
, escaped(reason
));
1483 /** Send SOCKS5 CONNECT command to <b>conn</b>, copying <b>conn->addr</b>
1484 * and <b>conn->port</b> into the request.
1487 connection_send_socks5_connect(connection_t
*conn
)
1489 unsigned char buf
[1024];
1491 uint16_t port
= htons(conn
->port
);
1493 buf
[0] = 5; /* version */
1494 buf
[1] = SOCKS_COMMAND_CONNECT
; /* command */
1495 buf
[2] = 0; /* reserved */
1497 if (tor_addr_family(&conn
->addr
) == AF_INET
) {
1498 uint32_t addr
= tor_addr_to_ipv4n(&conn
->addr
);
1502 memcpy(buf
+ 4, &addr
, 4);
1503 memcpy(buf
+ 8, &port
, 2);
1504 } else { /* AF_INET6 */
1507 memcpy(buf
+ 4, tor_addr_to_in6(&conn
->addr
), 16);
1508 memcpy(buf
+ 20, &port
, 2);
1511 connection_write_to_buf((char *)buf
, reqsize
, conn
);
1513 conn
->proxy_state
= PROXY_SOCKS5_WANT_CONNECT_OK
;
1516 /** Call this from connection_*_process_inbuf() to advance the proxy
1519 * No matter what proxy protocol is used, if this function returns 1, the
1520 * handshake is complete, and the data remaining on inbuf may contain the
1521 * start of the communication with the requested server.
1523 * Returns 0 if the current buffer contains an incomplete response, and -1
1527 connection_read_proxy_handshake(connection_t
*conn
)
1530 char *reason
= NULL
;
1532 log_debug(LD_NET
, "enter state %s",
1533 connection_proxy_state_to_string(conn
->proxy_state
));
1535 switch (conn
->proxy_state
) {
1536 case PROXY_HTTPS_WANT_CONNECT_OK
:
1537 ret
= connection_read_https_proxy_response(conn
);
1539 conn
->proxy_state
= PROXY_CONNECTED
;
1542 case PROXY_SOCKS4_WANT_CONNECT_OK
:
1543 ret
= fetch_from_buf_socks_client(conn
->inbuf
,
1547 conn
->proxy_state
= PROXY_CONNECTED
;
1550 case PROXY_SOCKS5_WANT_AUTH_METHOD_NONE
:
1551 ret
= fetch_from_buf_socks_client(conn
->inbuf
,
1554 /* no auth needed, do connect */
1556 connection_send_socks5_connect(conn
);
1561 case PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929
:
1562 ret
= fetch_from_buf_socks_client(conn
->inbuf
,
1566 /* send auth if needed, otherwise do connect */
1568 connection_send_socks5_connect(conn
);
1570 } else if (ret
== 2) {
1571 unsigned char buf
[1024];
1572 size_t reqsize
, usize
, psize
;
1573 const char *user
, *pass
;
1575 user
= get_options()->Socks5ProxyUsername
;
1576 pass
= get_options()->Socks5ProxyPassword
;
1577 tor_assert(user
&& pass
);
1579 /* XXX len of user and pass must be <= 255 !!! */
1580 usize
= strlen(user
);
1581 psize
= strlen(pass
);
1582 tor_assert(usize
<= 255 && psize
<= 255);
1583 reqsize
= 3 + usize
+ psize
;
1585 buf
[0] = 1; /* negotiation version */
1587 memcpy(buf
+ 2, user
, usize
);
1588 buf
[2 + usize
] = psize
;
1589 memcpy(buf
+ 3 + usize
, pass
, psize
);
1591 connection_write_to_buf((char *)buf
, reqsize
, conn
);
1593 conn
->proxy_state
= PROXY_SOCKS5_WANT_AUTH_RFC1929_OK
;
1598 case PROXY_SOCKS5_WANT_AUTH_RFC1929_OK
:
1599 ret
= fetch_from_buf_socks_client(conn
->inbuf
,
1602 /* send the connect request */
1604 connection_send_socks5_connect(conn
);
1609 case PROXY_SOCKS5_WANT_CONNECT_OK
:
1610 ret
= fetch_from_buf_socks_client(conn
->inbuf
,
1614 conn
->proxy_state
= PROXY_CONNECTED
;
1618 log_err(LD_BUG
, "Invalid proxy_state for reading, %d",
1620 tor_fragile_assert();
1625 log_debug(LD_NET
, "leaving state %s",
1626 connection_proxy_state_to_string(conn
->proxy_state
));
1630 log_warn(LD_NET
, "Proxy Client: unable to connect to %s:%d (%s)",
1631 conn
->address
, conn
->port
, escaped(reason
));
1634 log_warn(LD_NET
, "Proxy Client: unable to connect to %s:%d",
1635 conn
->address
, conn
->port
);
1637 } else if (ret
== 1) {
1638 log_info(LD_NET
, "Proxy Client: connection to %s:%d successful",
1639 conn
->address
, conn
->port
);
1646 * Launch any configured listener connections of type <b>type</b>. (A
1647 * listener is configured if <b>port_option</b> is non-zero. If any
1648 * ListenAddress configuration options are given in <b>cfg</b>, create a
1649 * connection binding to each one. Otherwise, create a single
1650 * connection binding to the address <b>default_addr</b>.)
1652 * Only launch the listeners of this type that are not already open, and
1653 * only close listeners that are no longer wanted. Existing listeners
1654 * that are still configured are not touched.
1656 * If <b>disable_all_conns</b> is set, then never open new conns, and
1657 * close the existing ones.
1659 * Add all old conns that should be closed to <b>replaced_conns</b>.
1660 * Add all new connections to <b>new_conns</b>.
1663 retry_listeners(int type
, config_line_t
*cfg
,
1664 int port_option
, const char *default_addr
,
1665 smartlist_t
*replaced_conns
,
1666 smartlist_t
*new_conns
,
1667 int disable_all_conns
,
1670 smartlist_t
*launch
= smartlist_create(), *conns
;
1671 int free_launch_elts
= 1;
1675 config_line_t
*line
;
1677 tor_assert(socket_family
== AF_INET
|| socket_family
== AF_UNIX
);
1679 if (cfg
&& port_option
) {
1680 for (c
= cfg
; c
; c
= c
->next
) {
1681 smartlist_add(launch
, c
);
1683 free_launch_elts
= 0;
1684 } else if (port_option
) {
1685 line
= tor_malloc_zero(sizeof(config_line_t
));
1686 line
->key
= tor_strdup("");
1687 line
->value
= tor_strdup(default_addr
);
1688 smartlist_add(launch
, line
);
1692 SMARTLIST_FOREACH(launch, config_line_t *, l,
1693 log_fn(LOG_NOTICE, "#%s#%s", l->key, l->value));
1696 conns
= get_connection_array();
1697 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
1699 if (conn
->type
!= type
||
1700 conn
->socket_family
!= socket_family
||
1701 conn
->marked_for_close
)
1703 /* Okay, so this is a listener. Is it configured? */
1705 SMARTLIST_FOREACH(launch
, config_line_t
*, wanted
,
1709 switch (socket_family
) {
1711 if (!parse_addr_port(LOG_WARN
,
1712 wanted
->value
, &address
, NULL
, &port
)) {
1713 int addr_matches
= !strcasecmp(address
, conn
->address
);
1717 if (port
== conn
->port
&& addr_matches
) {
1724 if (!strcasecmp(wanted
->value
, conn
->address
)) {
1733 if (!line
|| disable_all_conns
) {
1734 /* This one isn't configured. Close it. */
1735 log_notice(LD_NET
, "Closing no-longer-configured %s on %s:%d",
1736 conn_type_to_string(type
), conn
->address
, conn
->port
);
1737 if (replaced_conns
) {
1738 smartlist_add(replaced_conns
, conn
);
1740 connection_close_immediate(conn
);
1741 connection_mark_for_close(conn
);
1744 /* It's configured; we don't need to launch it. */
1745 // log_debug(LD_NET, "Already have %s on %s:%d",
1746 // conn_type_to_string(type), conn->address, conn->port);
1747 smartlist_remove(launch
, line
);
1748 if (free_launch_elts
)
1749 config_free_lines(line
);
1753 /* Now open all the listeners that are configured but not opened. */
1755 if (!disable_all_conns
) {
1756 SMARTLIST_FOREACH_BEGIN(launch
, config_line_t
*, cfg_line
) {
1757 char *address
= NULL
;
1758 struct sockaddr
*listensockaddr
;
1759 socklen_t listensocklen
= 0;
1761 switch (socket_family
) {
1763 listensockaddr
= (struct sockaddr
*)
1764 create_inet_sockaddr(cfg_line
->value
,
1765 (uint16_t) port_option
,
1766 &address
, &listensocklen
);
1769 listensockaddr
= (struct sockaddr
*)
1770 create_unix_sockaddr(cfg_line
->value
,
1771 &address
, &listensocklen
);
1777 if (listensockaddr
) {
1778 conn
= connection_create_listener(listensockaddr
, listensocklen
,
1780 tor_free(listensockaddr
);
1789 smartlist_add(new_conns
, conn
);
1791 } SMARTLIST_FOREACH_END(cfg_line
);
1794 if (free_launch_elts
) {
1795 SMARTLIST_FOREACH(launch
, config_line_t
*, cfg_line
,
1796 config_free_lines(cfg_line
));
1798 smartlist_free(launch
);
1803 /** Launch listeners for each port you should have open. Only launch
1804 * listeners who are not already open, and only close listeners we no longer
1807 * Add all old conns that should be closed to <b>replaced_conns</b>.
1808 * Add all new connections to <b>new_conns</b>.
1811 retry_all_listeners(smartlist_t
*replaced_conns
,
1812 smartlist_t
*new_conns
)
1814 or_options_t
*options
= get_options();
1816 if (retry_listeners(CONN_TYPE_OR_LISTENER
, options
->ORListenAddress
,
1817 options
->ORPort
, "0.0.0.0",
1818 replaced_conns
, new_conns
, options
->ClientOnly
,
1821 if (retry_listeners(CONN_TYPE_DIR_LISTENER
, options
->DirListenAddress
,
1822 options
->DirPort
, "0.0.0.0",
1823 replaced_conns
, new_conns
, options
->ClientOnly
,
1826 if (retry_listeners(CONN_TYPE_AP_LISTENER
, options
->SocksListenAddress
,
1827 options
->SocksPort
, "127.0.0.1",
1828 replaced_conns
, new_conns
, 0,
1831 if (retry_listeners(CONN_TYPE_AP_TRANS_LISTENER
, options
->TransListenAddress
,
1832 options
->TransPort
, "127.0.0.1",
1833 replaced_conns
, new_conns
, 0,
1836 if (retry_listeners(CONN_TYPE_AP_NATD_LISTENER
, options
->NatdListenAddress
,
1837 options
->NatdPort
, "127.0.0.1",
1838 replaced_conns
, new_conns
, 0,
1841 if (retry_listeners(CONN_TYPE_AP_DNS_LISTENER
, options
->DNSListenAddress
,
1842 options
->DNSPort
, "127.0.0.1",
1843 replaced_conns
, new_conns
, 0,
1846 if (retry_listeners(CONN_TYPE_CONTROL_LISTENER
,
1847 options
->ControlListenAddress
,
1848 options
->ControlPort
, "127.0.0.1",
1849 replaced_conns
, new_conns
, 0,
1852 if (retry_listeners(CONN_TYPE_CONTROL_LISTENER
,
1853 options
->ControlSocket
,
1854 options
->ControlSocket
? 1 : 0, NULL
,
1855 replaced_conns
, new_conns
, 0,
1862 /** Return 1 if we should apply rate limiting to <b>conn</b>,
1863 * and 0 otherwise. Right now this just checks if it's an internal
1864 * IP address or an internal connection. */
1866 connection_is_rate_limited(connection_t
*conn
)
1868 if (conn
->linked
|| /* internal connection */
1869 tor_addr_family(&conn
->addr
) == AF_UNSPEC
|| /* no address */
1870 tor_addr_is_internal(&conn
->addr
, 0)) /* internal address */
1876 extern int global_read_bucket
, global_write_bucket
;
1877 extern int global_relayed_read_bucket
, global_relayed_write_bucket
;
1879 /** Did either global write bucket run dry last second? If so,
1880 * we are likely to run dry again this second, so be stingy with the
1881 * tokens we just put in. */
1882 static int write_buckets_empty_last_second
= 0;
1884 /** How many seconds of no active local circuits will make the
1885 * connection revert to the "relayed" bandwidth class? */
1886 #define CLIENT_IDLE_TIME_FOR_PRIORITY 30
1888 /** Return 1 if <b>conn</b> should use tokens from the "relayed"
1889 * bandwidth rates, else 0. Currently, only OR conns with bandwidth
1890 * class 1, and directory conns that are serving data out, count.
1893 connection_counts_as_relayed_traffic(connection_t
*conn
, time_t now
)
1895 if (conn
->type
== CONN_TYPE_OR
&&
1896 TO_OR_CONN(conn
)->client_used
+ CLIENT_IDLE_TIME_FOR_PRIORITY
< now
)
1898 if (conn
->type
== CONN_TYPE_DIR
&& DIR_CONN_IS_SERVER(conn
))
1903 /** Helper function to decide how many bytes out of <b>global_bucket</b>
1904 * we're willing to use for this transaction. <b>base</b> is the size
1905 * of a cell on the network; <b>priority</b> says whether we should
1906 * write many of them or just a few; and <b>conn_bucket</b> (if
1907 * non-negative) provides an upper limit for our answer. */
1909 connection_bucket_round_robin(int base
, int priority
,
1910 ssize_t global_bucket
, ssize_t conn_bucket
)
1913 ssize_t num_bytes_high
= (priority
? 32 : 16) * base
;
1914 ssize_t num_bytes_low
= (priority
? 4 : 2) * base
;
1916 /* Do a rudimentary round-robin so one circuit can't hog a connection.
1917 * Pick at most 32 cells, at least 4 cells if possible, and if we're in
1918 * the middle pick 1/8 of the available bandwidth. */
1919 at_most
= global_bucket
/ 8;
1920 at_most
-= (at_most
% base
); /* round down */
1921 if (at_most
> num_bytes_high
) /* 16 KB, or 8 KB for low-priority */
1922 at_most
= num_bytes_high
;
1923 else if (at_most
< num_bytes_low
) /* 2 KB, or 1 KB for low-priority */
1924 at_most
= num_bytes_low
;
1926 if (at_most
> global_bucket
)
1927 at_most
= global_bucket
;
1929 if (conn_bucket
>= 0 && at_most
> conn_bucket
)
1930 at_most
= conn_bucket
;
1937 /** How many bytes at most can we read onto this connection? */
1939 connection_bucket_read_limit(connection_t
*conn
, time_t now
)
1941 int base
= connection_speaks_cells(conn
) ?
1942 CELL_NETWORK_SIZE
: RELAY_PAYLOAD_SIZE
;
1943 int priority
= conn
->type
!= CONN_TYPE_DIR
;
1944 int conn_bucket
= -1;
1945 int global_bucket
= global_read_bucket
;
1947 if (connection_speaks_cells(conn
)) {
1948 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
1949 if (conn
->state
== OR_CONN_STATE_OPEN
)
1950 conn_bucket
= or_conn
->read_bucket
;
1953 if (!connection_is_rate_limited(conn
)) {
1954 /* be willing to read on local conns even if our buckets are empty */
1955 return conn_bucket
>=0 ? conn_bucket
: 1<<14;
1958 if (connection_counts_as_relayed_traffic(conn
, now
) &&
1959 global_relayed_read_bucket
<= global_read_bucket
)
1960 global_bucket
= global_relayed_read_bucket
;
1962 return connection_bucket_round_robin(base
, priority
,
1963 global_bucket
, conn_bucket
);
1966 /** How many bytes at most can we write onto this connection? */
1968 connection_bucket_write_limit(connection_t
*conn
, time_t now
)
1970 int base
= connection_speaks_cells(conn
) ?
1971 CELL_NETWORK_SIZE
: RELAY_PAYLOAD_SIZE
;
1972 int priority
= conn
->type
!= CONN_TYPE_DIR
;
1973 int global_bucket
= global_write_bucket
;
1975 if (!connection_is_rate_limited(conn
)) {
1976 /* be willing to write to local conns even if our buckets are empty */
1977 return conn
->outbuf_flushlen
;
1980 if (connection_counts_as_relayed_traffic(conn
, now
) &&
1981 global_relayed_write_bucket
<= global_write_bucket
)
1982 global_bucket
= global_relayed_write_bucket
;
1984 return connection_bucket_round_robin(base
, priority
, global_bucket
,
1985 conn
->outbuf_flushlen
);
1988 /** Return 1 if the global write buckets are low enough that we
1989 * shouldn't send <b>attempt</b> bytes of low-priority directory stuff
1990 * out to <b>conn</b>. Else return 0.
1992 * Priority is 1 for v1 requests (directories and running-routers),
1993 * and 2 for v2 requests (statuses and descriptors). But see FFFF in
1994 * directory_handle_command_get() for why we don't use priority 2 yet.
1996 * There are a lot of parameters we could use here:
1997 * - global_relayed_write_bucket. Low is bad.
1998 * - global_write_bucket. Low is bad.
1999 * - bandwidthrate. Low is bad.
2000 * - bandwidthburst. Not a big factor?
2001 * - attempt. High is bad.
2002 * - total bytes queued on outbufs. High is bad. But I'm wary of
2003 * using this, since a few slow-flushing queues will pump up the
2004 * number without meaning what we meant to mean. What we really
2005 * mean is "total directory bytes added to outbufs recently", but
2006 * that's harder to quantify and harder to keep track of.
2009 global_write_bucket_low(connection_t
*conn
, size_t attempt
, int priority
)
2011 int smaller_bucket
= global_write_bucket
< global_relayed_write_bucket
?
2012 global_write_bucket
: global_relayed_write_bucket
;
2013 if (authdir_mode(get_options()) && priority
>1)
2014 return 0; /* there's always room to answer v2 if we're an auth dir */
2016 if (!connection_is_rate_limited(conn
))
2017 return 0; /* local conns don't get limited */
2019 if (smaller_bucket
< (int)attempt
)
2020 return 1; /* not enough space no matter the priority */
2022 if (write_buckets_empty_last_second
)
2023 return 1; /* we're already hitting our limits, no more please */
2025 if (priority
== 1) { /* old-style v1 query */
2026 /* Could we handle *two* of these requests within the next two seconds? */
2027 or_options_t
*options
= get_options();
2028 int64_t can_write
= (int64_t)smaller_bucket
2029 + 2*(options
->RelayBandwidthRate
? options
->RelayBandwidthRate
:
2030 options
->BandwidthRate
);
2031 if (can_write
< 2*(int64_t)attempt
)
2033 } else { /* v2 query */
2034 /* no further constraints yet */
2039 /** We just read num_read and wrote num_written onto conn.
2040 * Decrement buckets appropriately. */
2042 connection_buckets_decrement(connection_t
*conn
, time_t now
,
2043 size_t num_read
, size_t num_written
)
2045 if (!connection_is_rate_limited(conn
))
2046 return; /* local IPs are free */
2047 if (num_written
>= INT_MAX
|| num_read
>= INT_MAX
) {
2048 log_err(LD_BUG
, "Value out of range. num_read=%lu, num_written=%lu, "
2049 "connection type=%s, state=%s",
2050 (unsigned long)num_read
, (unsigned long)num_written
,
2051 conn_type_to_string(conn
->type
),
2052 conn_state_to_string(conn
->type
, conn
->state
));
2053 if (num_written
>= INT_MAX
) num_written
= 1;
2054 if (num_read
>= INT_MAX
) num_read
= 1;
2055 tor_fragile_assert();
2059 if (conn
->type
== CONN_TYPE_EXIT
)
2060 rep_hist_note_exit_bytes_read(conn
->port
, num_read
);
2061 rep_hist_note_bytes_read(num_read
, now
);
2063 if (num_written
> 0) {
2064 if (conn
->type
== CONN_TYPE_EXIT
)
2065 rep_hist_note_exit_bytes_written(conn
->port
, num_written
);
2066 rep_hist_note_bytes_written(num_written
, now
);
2069 if (connection_counts_as_relayed_traffic(conn
, now
)) {
2070 global_relayed_read_bucket
-= (int)num_read
;
2071 global_relayed_write_bucket
-= (int)num_written
;
2073 global_read_bucket
-= (int)num_read
;
2074 global_write_bucket
-= (int)num_written
;
2075 if (connection_speaks_cells(conn
) && conn
->state
== OR_CONN_STATE_OPEN
)
2076 TO_OR_CONN(conn
)->read_bucket
-= (int)num_read
;
2079 /** If we have exhausted our global buckets, or the buckets for conn,
2082 connection_consider_empty_read_buckets(connection_t
*conn
)
2086 if (global_read_bucket
<= 0) {
2087 reason
= "global read bucket exhausted. Pausing.";
2088 } else if (connection_counts_as_relayed_traffic(conn
, approx_time()) &&
2089 global_relayed_read_bucket
<= 0) {
2090 reason
= "global relayed read bucket exhausted. Pausing.";
2091 } else if (connection_speaks_cells(conn
) &&
2092 conn
->state
== OR_CONN_STATE_OPEN
&&
2093 TO_OR_CONN(conn
)->read_bucket
<= 0) {
2094 reason
= "connection read bucket exhausted. Pausing.";
2096 return; /* all good, no need to stop it */
2098 LOG_FN_CONN(conn
, (LOG_DEBUG
, LD_NET
, "%s", reason
));
2099 conn
->read_blocked_on_bw
= 1;
2100 connection_stop_reading(conn
);
2103 /** If we have exhausted our global buckets, or the buckets for conn,
2106 connection_consider_empty_write_buckets(connection_t
*conn
)
2110 if (global_write_bucket
<= 0) {
2111 reason
= "global write bucket exhausted. Pausing.";
2112 } else if (connection_counts_as_relayed_traffic(conn
, approx_time()) &&
2113 global_relayed_write_bucket
<= 0) {
2114 reason
= "global relayed write bucket exhausted. Pausing.";
2116 } else if (connection_speaks_cells(conn
) &&
2117 conn
->state
== OR_CONN_STATE_OPEN
&&
2118 TO_OR_CONN(conn
)->write_bucket
<= 0) {
2119 reason
= "connection write bucket exhausted. Pausing.";
2122 return; /* all good, no need to stop it */
2124 LOG_FN_CONN(conn
, (LOG_DEBUG
, LD_NET
, "%s", reason
));
2125 conn
->write_blocked_on_bw
= 1;
2126 connection_stop_writing(conn
);
2129 /** Initialize the global read bucket to options-\>BandwidthBurst. */
2131 connection_bucket_init(void)
2133 or_options_t
*options
= get_options();
2134 /* start it at max traffic */
2135 global_read_bucket
= (int)options
->BandwidthBurst
;
2136 global_write_bucket
= (int)options
->BandwidthBurst
;
2137 if (options
->RelayBandwidthRate
) {
2138 global_relayed_read_bucket
= (int)options
->RelayBandwidthBurst
;
2139 global_relayed_write_bucket
= (int)options
->RelayBandwidthBurst
;
2141 global_relayed_read_bucket
= (int)options
->BandwidthBurst
;
2142 global_relayed_write_bucket
= (int)options
->BandwidthBurst
;
2146 /** Refill a single <b>bucket</b> called <b>name</b> with bandwidth rate
2147 * <b>rate</b> and bandwidth burst <b>burst</b>, assuming that
2148 * <b>seconds_elapsed</b> seconds have passed since the last call.
2151 connection_bucket_refill_helper(int *bucket
, int rate
, int burst
,
2152 int seconds_elapsed
, const char *name
)
2154 int starting_bucket
= *bucket
;
2155 if (starting_bucket
< burst
&& seconds_elapsed
) {
2156 if (((burst
- starting_bucket
)/seconds_elapsed
) < rate
) {
2157 *bucket
= burst
; /* We would overflow the bucket; just set it to
2160 int incr
= rate
*seconds_elapsed
;
2162 if (*bucket
> burst
|| *bucket
< starting_bucket
) {
2163 /* If we overflow the burst, or underflow our starting bucket,
2164 * cap the bucket value to burst. */
2165 /* XXXX this might be redundant now, but it doesn't show up
2166 * in profiles. Remove it after analysis. */
2170 log(LOG_DEBUG
, LD_NET
,"%s now %d.", name
, *bucket
);
2174 /** A second has rolled over; increment buckets appropriately. */
2176 connection_bucket_refill(int seconds_elapsed
, time_t now
)
2178 or_options_t
*options
= get_options();
2179 smartlist_t
*conns
= get_connection_array();
2180 int relayrate
, relayburst
;
2182 if (options
->RelayBandwidthRate
) {
2183 relayrate
= (int)options
->RelayBandwidthRate
;
2184 relayburst
= (int)options
->RelayBandwidthBurst
;
2186 relayrate
= (int)options
->BandwidthRate
;
2187 relayburst
= (int)options
->BandwidthBurst
;
2190 tor_assert(seconds_elapsed
>= 0);
2192 write_buckets_empty_last_second
=
2193 global_relayed_write_bucket
<= 0 || global_write_bucket
<= 0;
2195 /* refill the global buckets */
2196 connection_bucket_refill_helper(&global_read_bucket
,
2197 (int)options
->BandwidthRate
,
2198 (int)options
->BandwidthBurst
,
2199 seconds_elapsed
, "global_read_bucket");
2200 connection_bucket_refill_helper(&global_write_bucket
,
2201 (int)options
->BandwidthRate
,
2202 (int)options
->BandwidthBurst
,
2203 seconds_elapsed
, "global_write_bucket");
2204 connection_bucket_refill_helper(&global_relayed_read_bucket
,
2205 relayrate
, relayburst
, seconds_elapsed
,
2206 "global_relayed_read_bucket");
2207 connection_bucket_refill_helper(&global_relayed_write_bucket
,
2208 relayrate
, relayburst
, seconds_elapsed
,
2209 "global_relayed_write_bucket");
2211 /* refill the per-connection buckets */
2212 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
2214 if (connection_speaks_cells(conn
)) {
2215 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
2216 if (connection_read_bucket_should_increase(or_conn
)) {
2217 connection_bucket_refill_helper(&or_conn
->read_bucket
,
2218 or_conn
->bandwidthrate
,
2219 or_conn
->bandwidthburst
,
2221 "or_conn->read_bucket");
2222 //log_fn(LOG_DEBUG,"Receiver bucket %d now %d.", i,
2223 // conn->read_bucket);
2227 if (conn
->read_blocked_on_bw
== 1 /* marked to turn reading back on now */
2228 && global_read_bucket
> 0 /* and we're allowed to read */
2229 && (!connection_counts_as_relayed_traffic(conn
, now
) ||
2230 global_relayed_read_bucket
> 0) /* even if we're relayed traffic */
2231 && (!connection_speaks_cells(conn
) ||
2232 conn
->state
!= OR_CONN_STATE_OPEN
||
2233 TO_OR_CONN(conn
)->read_bucket
> 0)) {
2234 /* and either a non-cell conn or a cell conn with non-empty bucket */
2235 LOG_FN_CONN(conn
, (LOG_DEBUG
,LD_NET
,
2236 "waking up conn (fd %d) for read", conn
->s
));
2237 conn
->read_blocked_on_bw
= 0;
2238 connection_start_reading(conn
);
2241 if (conn
->write_blocked_on_bw
== 1
2242 && global_write_bucket
> 0 /* and we're allowed to write */
2243 && (!connection_counts_as_relayed_traffic(conn
, now
) ||
2244 global_relayed_write_bucket
> 0)) {
2245 /* even if we're relayed traffic */
2246 LOG_FN_CONN(conn
, (LOG_DEBUG
,LD_NET
,
2247 "waking up conn (fd %d) for write", conn
->s
));
2248 conn
->write_blocked_on_bw
= 0;
2249 connection_start_writing(conn
);
2254 /** Is the receiver bucket for connection <b>conn</b> low enough that we
2255 * should add another pile of tokens to it?
2258 connection_read_bucket_should_increase(or_connection_t
*conn
)
2262 if (conn
->_base
.state
!= OR_CONN_STATE_OPEN
)
2263 return 0; /* only open connections play the rate limiting game */
2264 if (conn
->read_bucket
>= conn
->bandwidthburst
)
2270 /** Read bytes from conn-\>s and process them.
2272 * This function gets called from conn_read() in main.c, either
2273 * when poll() has declared that conn wants to read, or (for OR conns)
2274 * when there are pending TLS bytes.
2276 * It calls connection_read_to_buf() to bring in any new bytes,
2277 * and then calls connection_process_inbuf() to process them.
2279 * Mark the connection and return -1 if you want to close it, else
2283 connection_handle_read_impl(connection_t
*conn
)
2285 int max_to_read
=-1, try_to_read
;
2286 size_t before
, n_read
= 0;
2287 int socket_error
= 0;
2289 if (conn
->marked_for_close
)
2290 return 0; /* do nothing */
2292 conn
->timestamp_lastread
= approx_time();
2294 switch (conn
->type
) {
2295 case CONN_TYPE_OR_LISTENER
:
2296 return connection_handle_listener_read(conn
, CONN_TYPE_OR
);
2297 case CONN_TYPE_AP_LISTENER
:
2298 case CONN_TYPE_AP_TRANS_LISTENER
:
2299 case CONN_TYPE_AP_NATD_LISTENER
:
2300 return connection_handle_listener_read(conn
, CONN_TYPE_AP
);
2301 case CONN_TYPE_DIR_LISTENER
:
2302 return connection_handle_listener_read(conn
, CONN_TYPE_DIR
);
2303 case CONN_TYPE_CONTROL_LISTENER
:
2304 return connection_handle_listener_read(conn
, CONN_TYPE_CONTROL
);
2305 case CONN_TYPE_AP_DNS_LISTENER
:
2306 /* This should never happen; eventdns.c handles the reads here. */
2307 tor_fragile_assert();
2312 try_to_read
= max_to_read
;
2313 tor_assert(!conn
->marked_for_close
);
2315 before
= buf_datalen(conn
->inbuf
);
2316 if (connection_read_to_buf(conn
, &max_to_read
, &socket_error
) < 0) {
2317 /* There's a read error; kill the connection.*/
2318 if (conn
->type
== CONN_TYPE_OR
&&
2319 conn
->state
== OR_CONN_STATE_CONNECTING
) {
2320 connection_or_connect_failed(TO_OR_CONN(conn
),
2321 errno_to_orconn_end_reason(socket_error
),
2322 tor_socket_strerror(socket_error
));
2324 if (CONN_IS_EDGE(conn
)) {
2325 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
2326 connection_edge_end_errno(edge_conn
);
2327 if (edge_conn
->socks_request
) /* broken, don't send a socks reply back */
2328 edge_conn
->socks_request
->has_finished
= 1;
2330 connection_close_immediate(conn
); /* Don't flush; connection is dead. */
2331 connection_mark_for_close(conn
);
2334 n_read
+= buf_datalen(conn
->inbuf
) - before
;
2335 if (CONN_IS_EDGE(conn
) && try_to_read
!= max_to_read
) {
2336 /* instruct it not to try to package partial cells. */
2337 if (connection_process_inbuf(conn
, 0) < 0) {
2340 if (!conn
->marked_for_close
&&
2341 connection_is_reading(conn
) &&
2342 !conn
->inbuf_reached_eof
&&
2344 goto loop_again
; /* try reading again, in case more is here now */
2346 /* one last try, packaging partial cells and all. */
2347 if (!conn
->marked_for_close
&&
2348 connection_process_inbuf(conn
, 1) < 0) {
2351 if (conn
->linked_conn
) {
2352 /* The other side's handle_write() will never actually get called, so
2353 * we need to invoke the appropriate callbacks ourself. */
2354 connection_t
*linked
= conn
->linked_conn
;
2357 /* Probably a no-op, but hey. */
2358 connection_buckets_decrement(linked
, approx_time(), n_read
, 0);
2360 if (connection_flushed_some(linked
) < 0)
2361 connection_mark_for_close(linked
);
2362 if (!connection_wants_to_flush(linked
))
2363 connection_finished_flushing(linked
);
2366 if (!buf_datalen(linked
->outbuf
) && conn
->active_on_link
)
2367 connection_stop_reading_from_linked_conn(conn
);
2369 /* If we hit the EOF, call connection_reached_eof(). */
2370 if (!conn
->marked_for_close
&&
2371 conn
->inbuf_reached_eof
&&
2372 connection_reached_eof(conn
) < 0) {
2379 connection_handle_read(connection_t
*conn
)
2383 tor_gettimeofday_cache_clear();
2384 res
= connection_handle_read_impl(conn
);
2388 /** Pull in new bytes from conn-\>s or conn-\>linked_conn onto conn-\>inbuf,
2389 * either directly or via TLS. Reduce the token buckets by the number of bytes
2392 * If *max_to_read is -1, then decide it ourselves, else go with the
2393 * value passed to us. When returning, if it's changed, subtract the
2394 * number of bytes we read from *max_to_read.
2396 * Return -1 if we want to break conn, else return 0.
2399 connection_read_to_buf(connection_t
*conn
, int *max_to_read
, int *socket_error
)
2402 ssize_t at_most
= *max_to_read
;
2403 size_t slack_in_buf
, more_to_read
;
2404 size_t n_read
= 0, n_written
= 0;
2406 if (at_most
== -1) { /* we need to initialize it */
2407 /* how many bytes are we allowed to read? */
2408 at_most
= connection_bucket_read_limit(conn
, approx_time());
2411 slack_in_buf
= buf_slack(conn
->inbuf
);
2413 if ((size_t)at_most
> slack_in_buf
&& slack_in_buf
>= 1024) {
2414 more_to_read
= at_most
- slack_in_buf
;
2415 at_most
= slack_in_buf
;
2420 if (connection_speaks_cells(conn
) &&
2421 conn
->state
> OR_CONN_STATE_PROXY_HANDSHAKING
) {
2423 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
2424 size_t initial_size
;
2425 if (conn
->state
== OR_CONN_STATE_TLS_HANDSHAKING
||
2426 conn
->state
== OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING
) {
2427 /* continue handshaking even if global token bucket is empty */
2428 return connection_tls_continue_handshake(or_conn
);
2432 "%d: starting, inbuf_datalen %ld (%d pending in tls object)."
2434 conn
->s
,(long)buf_datalen(conn
->inbuf
),
2435 tor_tls_get_pending_bytes(or_conn
->tls
), (long)at_most
);
2437 initial_size
= buf_datalen(conn
->inbuf
);
2438 /* else open, or closing */
2439 result
= read_to_buf_tls(or_conn
->tls
, at_most
, conn
->inbuf
);
2440 if (TOR_TLS_IS_ERROR(result
) || result
== TOR_TLS_CLOSE
)
2441 or_conn
->tls_error
= result
;
2443 or_conn
->tls_error
= 0;
2447 case TOR_TLS_ERROR_IO
:
2448 log_debug(LD_NET
,"TLS connection closed %son read. Closing. "
2449 "(Nickname %s, address %s)",
2450 result
== TOR_TLS_CLOSE
? "cleanly " : "",
2451 or_conn
->nickname
? or_conn
->nickname
: "not set",
2454 CASE_TOR_TLS_ERROR_ANY_NONIO
:
2455 log_debug(LD_NET
,"tls error [%s]. breaking (nickname %s, address %s).",
2456 tor_tls_err_to_string(result
),
2457 or_conn
->nickname
? or_conn
->nickname
: "not set",
2460 case TOR_TLS_WANTWRITE
:
2461 connection_start_writing(conn
);
2463 case TOR_TLS_WANTREAD
: /* we're already reading */
2464 case TOR_TLS_DONE
: /* no data read, so nothing to process */
2466 break; /* so we call bucket_decrement below */
2470 pending
= tor_tls_get_pending_bytes(or_conn
->tls
);
2472 /* If we have any pending bytes, we read them now. This *can*
2473 * take us over our read allotment, but really we shouldn't be
2474 * believing that SSL bytes are the same as TCP bytes anyway. */
2475 int r2
= read_to_buf_tls(or_conn
->tls
, pending
, conn
->inbuf
);
2477 log_warn(LD_BUG
, "apparently, reading pending bytes can fail.");
2481 result
= (int)(buf_datalen(conn
->inbuf
)-initial_size
);
2482 tor_tls_get_n_raw_bytes(or_conn
->tls
, &n_read
, &n_written
);
2483 log_debug(LD_GENERAL
, "After TLS read of %d: %ld read, %ld written",
2484 result
, (long)n_read
, (long)n_written
);
2485 } else if (conn
->linked
) {
2486 if (conn
->linked_conn
) {
2487 result
= move_buf_to_buf(conn
->inbuf
, conn
->linked_conn
->outbuf
,
2488 &conn
->linked_conn
->outbuf_flushlen
);
2492 //log_notice(LD_GENERAL, "Moved %d bytes on an internal link!", result);
2493 /* If the other side has disappeared, or if it's been marked for close and
2494 * we flushed its outbuf, then we should set our inbuf_reached_eof. */
2495 if (!conn
->linked_conn
||
2496 (conn
->linked_conn
->marked_for_close
&&
2497 buf_datalen(conn
->linked_conn
->outbuf
) == 0))
2498 conn
->inbuf_reached_eof
= 1;
2500 n_read
= (size_t) result
;
2502 /* !connection_speaks_cells, !conn->linked_conn. */
2503 int reached_eof
= 0;
2504 CONN_LOG_PROTECT(conn
,
2505 result
= read_to_buf(conn
->s
, at_most
, conn
->inbuf
, &reached_eof
,
2508 conn
->inbuf_reached_eof
= 1;
2510 // log_fn(LOG_DEBUG,"read_to_buf returned %d.",read_result);
2514 n_read
= (size_t) result
;
2517 if (n_read
> 0) { /* change *max_to_read */
2518 /*XXXX021 check for overflow*/
2519 *max_to_read
= (int)(at_most
- n_read
);
2522 if (conn
->type
== CONN_TYPE_AP
) {
2523 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
2524 /*XXXX021 check for overflow*/
2525 edge_conn
->n_read
+= (int)n_read
;
2528 connection_buckets_decrement(conn
, approx_time(), n_read
, n_written
);
2530 if (more_to_read
&& result
== at_most
) {
2531 slack_in_buf
= buf_slack(conn
->inbuf
);
2532 at_most
= more_to_read
;
2536 /* Call even if result is 0, since the global read bucket may
2537 * have reached 0 on a different conn, and this guy needs to
2538 * know to stop reading. */
2539 connection_consider_empty_read_buckets(conn
);
2540 if (n_written
> 0 && connection_is_writing(conn
))
2541 connection_consider_empty_write_buckets(conn
);
2546 /** A pass-through to fetch_from_buf. */
2548 connection_fetch_from_buf(char *string
, size_t len
, connection_t
*conn
)
2550 return fetch_from_buf(string
, len
, conn
->inbuf
);
2553 /** Return conn-\>outbuf_flushlen: how many bytes conn wants to flush
2554 * from its outbuf. */
2556 connection_wants_to_flush(connection_t
*conn
)
2558 return conn
->outbuf_flushlen
> 0;
2561 /** Are there too many bytes on edge connection <b>conn</b>'s outbuf to
2562 * send back a relay-level sendme yet? Return 1 if so, 0 if not. Used by
2563 * connection_edge_consider_sending_sendme().
2566 connection_outbuf_too_full(connection_t
*conn
)
2568 return (conn
->outbuf_flushlen
> 10*CELL_PAYLOAD_SIZE
);
2571 /** Try to flush more bytes onto conn-\>s.
2573 * This function gets called either from conn_write() in main.c
2574 * when poll() has declared that conn wants to write, or below
2575 * from connection_write_to_buf() when an entire TLS record is ready.
2577 * Update conn-\>timestamp_lastwritten to now, and call flush_buf
2578 * or flush_buf_tls appropriately. If it succeeds and there are no more
2579 * more bytes on conn->outbuf, then call connection_finished_flushing
2582 * If <b>force</b>, then write as many bytes as possible, ignoring bandwidth
2583 * limits. (Used for flushing messages to controller connections on fatal
2586 * Mark the connection and return -1 if you want to close it, else
2590 connection_handle_write_impl(connection_t
*conn
, int force
)
2593 socklen_t len
=(socklen_t
)sizeof(e
);
2595 ssize_t max_to_write
;
2596 time_t now
= approx_time();
2597 size_t n_read
= 0, n_written
= 0;
2599 tor_assert(!connection_is_listener(conn
));
2601 if (conn
->marked_for_close
|| conn
->s
< 0)
2602 return 0; /* do nothing */
2604 if (conn
->in_flushed_some
) {
2605 log_warn(LD_BUG
, "called recursively from inside conn->in_flushed_some");
2609 conn
->timestamp_lastwritten
= now
;
2611 /* Sometimes, "writable" means "connected". */
2612 if (connection_state_is_connecting(conn
)) {
2613 if (getsockopt(conn
->s
, SOL_SOCKET
, SO_ERROR
, (void*)&e
, &len
) < 0) {
2615 "getsockopt() syscall failed?! Please report to tor-ops.");
2616 if (CONN_IS_EDGE(conn
))
2617 connection_edge_end_errno(TO_EDGE_CONN(conn
));
2618 connection_mark_for_close(conn
);
2622 /* some sort of error, but maybe just inprogress still */
2623 if (!ERRNO_IS_CONN_EINPROGRESS(e
)) {
2624 log_info(LD_NET
,"in-progress connect failed. Removing. (%s)",
2625 tor_socket_strerror(e
));
2626 if (CONN_IS_EDGE(conn
))
2627 connection_edge_end_errno(TO_EDGE_CONN(conn
));
2628 if (conn
->type
== CONN_TYPE_OR
)
2629 connection_or_connect_failed(TO_OR_CONN(conn
),
2630 errno_to_orconn_end_reason(e
),
2631 tor_socket_strerror(e
));
2633 connection_close_immediate(conn
);
2634 connection_mark_for_close(conn
);
2637 return 0; /* no change, see if next time is better */
2640 /* The connection is successful. */
2641 if (connection_finished_connecting(conn
)<0)
2645 max_to_write
= force
? (ssize_t
)conn
->outbuf_flushlen
2646 : connection_bucket_write_limit(conn
, now
);
2648 if (connection_speaks_cells(conn
) &&
2649 conn
->state
> OR_CONN_STATE_PROXY_HANDSHAKING
) {
2650 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
2651 if (conn
->state
== OR_CONN_STATE_TLS_HANDSHAKING
||
2652 conn
->state
== OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING
) {
2653 connection_stop_writing(conn
);
2654 if (connection_tls_continue_handshake(or_conn
) < 0) {
2655 /* Don't flush; connection is dead. */
2656 connection_close_immediate(conn
);
2657 connection_mark_for_close(conn
);
2661 } else if (conn
->state
== OR_CONN_STATE_TLS_SERVER_RENEGOTIATING
) {
2662 return connection_handle_read(conn
);
2665 /* else open, or closing */
2666 result
= flush_buf_tls(or_conn
->tls
, conn
->outbuf
,
2667 max_to_write
, &conn
->outbuf_flushlen
);
2669 /* If we just flushed the last bytes, check if this tunneled dir
2670 * request is done. */
2671 if (buf_datalen(conn
->outbuf
) == 0 && conn
->dirreq_id
)
2672 geoip_change_dirreq_state(conn
->dirreq_id
, DIRREQ_TUNNELED
,
2673 DIRREQ_OR_CONN_BUFFER_FLUSHED
);
2676 CASE_TOR_TLS_ERROR_ANY
:
2678 log_info(LD_NET
,result
!=TOR_TLS_CLOSE
?
2679 "tls error. breaking.":"TLS connection closed on flush");
2680 /* Don't flush; connection is dead. */
2681 connection_close_immediate(conn
);
2682 connection_mark_for_close(conn
);
2684 case TOR_TLS_WANTWRITE
:
2685 log_debug(LD_NET
,"wanted write.");
2686 /* we're already writing */
2688 case TOR_TLS_WANTREAD
:
2689 /* Make sure to avoid a loop if the receive buckets are empty. */
2690 log_debug(LD_NET
,"wanted read.");
2691 if (!connection_is_reading(conn
)) {
2692 connection_stop_writing(conn
);
2693 conn
->write_blocked_on_bw
= 1;
2694 /* we'll start reading again when we get more tokens in our
2695 * read bucket; then we'll start writing again too.
2698 /* else no problem, we're already reading */
2700 /* case TOR_TLS_DONE:
2701 * for TOR_TLS_DONE, fall through to check if the flushlen
2702 * is empty, so we can stop writing.
2706 tor_tls_get_n_raw_bytes(or_conn
->tls
, &n_read
, &n_written
);
2707 log_debug(LD_GENERAL
, "After TLS write of %d: %ld read, %ld written",
2708 result
, (long)n_read
, (long)n_written
);
2710 CONN_LOG_PROTECT(conn
,
2711 result
= flush_buf(conn
->s
, conn
->outbuf
,
2712 max_to_write
, &conn
->outbuf_flushlen
));
2714 if (CONN_IS_EDGE(conn
))
2715 connection_edge_end_errno(TO_EDGE_CONN(conn
));
2717 connection_close_immediate(conn
); /* Don't flush; connection is dead. */
2718 connection_mark_for_close(conn
);
2721 n_written
= (size_t) result
;
2724 if (conn
->type
== CONN_TYPE_AP
) {
2725 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
2726 /*XXXX021 check for overflow.*/
2727 edge_conn
->n_written
+= (int)n_written
;
2730 connection_buckets_decrement(conn
, approx_time(), n_read
, n_written
);
2733 /* If we wrote any bytes from our buffer, then call the appropriate
2735 if (connection_flushed_some(conn
) < 0)
2736 connection_mark_for_close(conn
);
2739 if (!connection_wants_to_flush(conn
)) { /* it's done flushing */
2740 if (connection_finished_flushing(conn
) < 0) {
2741 /* already marked */
2747 /* Call even if result is 0, since the global write bucket may
2748 * have reached 0 on a different conn, and this guy needs to
2749 * know to stop writing. */
2750 connection_consider_empty_write_buckets(conn
);
2751 if (n_read
> 0 && connection_is_reading(conn
))
2752 connection_consider_empty_read_buckets(conn
);
2758 connection_handle_write(connection_t
*conn
, int force
)
2761 tor_gettimeofday_cache_clear();
2762 res
= connection_handle_write_impl(conn
, force
);
2766 /** OpenSSL TLS record size is 16383; this is close. The goal here is to
2767 * push data out as soon as we know there's enough for a TLS record, so
2768 * during periods of high load we won't read entire megabytes from
2769 * input before pushing any data out. It also has the feature of not
2770 * growing huge outbufs unless something is slow. */
2771 #define MIN_TLS_FLUSHLEN 15872
2773 /** Append <b>len</b> bytes of <b>string</b> onto <b>conn</b>'s
2774 * outbuf, and ask it to start writing.
2776 * If <b>zlib</b> is nonzero, this is a directory connection that should get
2777 * its contents compressed or decompressed as they're written. If zlib is
2778 * negative, this is the last data to be compressed, and the connection's zlib
2779 * state should be flushed.
2781 * If it's an OR conn and an entire TLS record is ready, then try to
2782 * flush the record now. Similarly, if it's a local control connection
2783 * and a 64k chunk is ready, try to flush it all, so we don't end up with
2784 * many megabytes of controller info queued at once.
2787 _connection_write_to_buf_impl(const char *string
, size_t len
,
2788 connection_t
*conn
, int zlib
)
2790 /* XXXX This function really needs to return -1 on failure. */
2793 if (!len
&& !(zlib
<0))
2795 /* if it's marked for close, only allow write if we mean to flush it */
2796 if (conn
->marked_for_close
&& !conn
->hold_open_until_flushed
)
2799 old_datalen
= buf_datalen(conn
->outbuf
);
2801 dir_connection_t
*dir_conn
= TO_DIR_CONN(conn
);
2802 int done
= zlib
< 0;
2803 CONN_LOG_PROTECT(conn
, r
= write_to_buf_zlib(conn
->outbuf
,
2804 dir_conn
->zlib_state
,
2805 string
, len
, done
));
2807 CONN_LOG_PROTECT(conn
, r
= write_to_buf(string
, len
, conn
->outbuf
));
2810 if (CONN_IS_EDGE(conn
)) {
2811 /* if it failed, it means we have our package/delivery windows set
2812 wrong compared to our max outbuf size. close the whole circuit. */
2814 "write_to_buf failed. Closing circuit (fd %d).", conn
->s
);
2815 circuit_mark_for_close(circuit_get_by_edge_conn(TO_EDGE_CONN(conn
)),
2816 END_CIRC_REASON_INTERNAL
);
2819 "write_to_buf failed. Closing connection (fd %d).", conn
->s
);
2820 connection_mark_for_close(conn
);
2825 connection_start_writing(conn
);
2827 conn
->outbuf_flushlen
+= buf_datalen(conn
->outbuf
) - old_datalen
;
2830 conn
->outbuf_flushlen
+= len
;
2832 /* Should we try flushing the outbuf now? */
2833 if (conn
->in_flushed_some
) {
2834 /* Don't flush the outbuf when the reason we're writing more stuff is
2835 * _because_ we flushed the outbuf. That's unfair. */
2839 if (conn
->type
== CONN_TYPE_OR
&&
2840 conn
->outbuf_flushlen
-len
< MIN_TLS_FLUSHLEN
&&
2841 conn
->outbuf_flushlen
>= MIN_TLS_FLUSHLEN
) {
2842 /* We just pushed outbuf_flushlen to MIN_TLS_FLUSHLEN or above;
2843 * we can send out a full TLS frame now if we like. */
2844 extra
= conn
->outbuf_flushlen
- MIN_TLS_FLUSHLEN
;
2845 conn
->outbuf_flushlen
= MIN_TLS_FLUSHLEN
;
2846 } else if (conn
->type
== CONN_TYPE_CONTROL
&&
2847 !connection_is_rate_limited(conn
) &&
2848 conn
->outbuf_flushlen
-len
< 1<<16 &&
2849 conn
->outbuf_flushlen
>= 1<<16) {
2850 /* just try to flush all of it */
2852 return; /* no need to try flushing */
2854 if (connection_handle_write(conn
, 0) < 0) {
2855 if (!conn
->marked_for_close
) {
2856 /* this connection is broken. remove it. */
2857 log_warn(LD_BUG
, "unhandled error on write for "
2858 "conn (type %d, fd %d); removing",
2859 conn
->type
, conn
->s
);
2860 tor_fragile_assert();
2861 /* do a close-immediate here, so we don't try to flush */
2862 connection_close_immediate(conn
);
2867 conn
->outbuf_flushlen
+= extra
;
2868 connection_start_writing(conn
);
2873 /** Return a connection with given type, address, port, and purpose;
2874 * or NULL if no such connection exists. */
2876 connection_get_by_type_addr_port_purpose(int type
,
2877 const tor_addr_t
*addr
, uint16_t port
,
2880 smartlist_t
*conns
= get_connection_array();
2881 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
2883 if (conn
->type
== type
&&
2884 tor_addr_eq(&conn
->addr
, addr
) &&
2885 conn
->port
== port
&&
2886 conn
->purpose
== purpose
&&
2887 !conn
->marked_for_close
)
2893 /** Return the stream with id <b>id</b> if it is not already marked for
2897 connection_get_by_global_id(uint64_t id
)
2899 smartlist_t
*conns
= get_connection_array();
2900 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
2902 if (conn
->global_identifier
== id
)
2908 /** Return a connection of type <b>type</b> that is not marked for close.
2911 connection_get_by_type(int type
)
2913 smartlist_t
*conns
= get_connection_array();
2914 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
2916 if (conn
->type
== type
&& !conn
->marked_for_close
)
2922 /** Return a connection of type <b>type</b> that is in state <b>state</b>,
2923 * and that is not marked for close.
2926 connection_get_by_type_state(int type
, int state
)
2928 smartlist_t
*conns
= get_connection_array();
2929 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
2931 if (conn
->type
== type
&& conn
->state
== state
&& !conn
->marked_for_close
)
2937 /** Return a connection of type <b>type</b> that has rendquery equal
2938 * to <b>rendquery</b>, and that is not marked for close. If state
2939 * is non-zero, conn must be of that state too.
2942 connection_get_by_type_state_rendquery(int type
, int state
,
2943 const char *rendquery
)
2945 smartlist_t
*conns
= get_connection_array();
2947 tor_assert(type
== CONN_TYPE_DIR
||
2948 type
== CONN_TYPE_AP
|| type
== CONN_TYPE_EXIT
);
2949 tor_assert(rendquery
);
2951 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
2953 if (conn
->type
== type
&&
2954 !conn
->marked_for_close
&&
2955 (!state
|| state
== conn
->state
)) {
2956 if (type
== CONN_TYPE_DIR
&&
2957 TO_DIR_CONN(conn
)->rend_data
&&
2958 !rend_cmp_service_ids(rendquery
,
2959 TO_DIR_CONN(conn
)->rend_data
->onion_address
))
2961 else if (CONN_IS_EDGE(conn
) &&
2962 TO_EDGE_CONN(conn
)->rend_data
&&
2963 !rend_cmp_service_ids(rendquery
,
2964 TO_EDGE_CONN(conn
)->rend_data
->onion_address
))
2971 /** Return an open, non-marked connection of a given type and purpose, or NULL
2972 * if no such connection exists. */
2974 connection_get_by_type_purpose(int type
, int purpose
)
2976 smartlist_t
*conns
= get_connection_array();
2977 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
2979 if (conn
->type
== type
&&
2980 !conn
->marked_for_close
&&
2981 (purpose
== conn
->purpose
))
2987 /** Return 1 if <b>conn</b> is a listener conn, else return 0. */
2989 connection_is_listener(connection_t
*conn
)
2991 if (conn
->type
== CONN_TYPE_OR_LISTENER
||
2992 conn
->type
== CONN_TYPE_AP_LISTENER
||
2993 conn
->type
== CONN_TYPE_AP_TRANS_LISTENER
||
2994 conn
->type
== CONN_TYPE_AP_DNS_LISTENER
||
2995 conn
->type
== CONN_TYPE_AP_NATD_LISTENER
||
2996 conn
->type
== CONN_TYPE_DIR_LISTENER
||
2997 conn
->type
== CONN_TYPE_CONTROL_LISTENER
)
3002 /** Return 1 if <b>conn</b> is in state "open" and is not marked
3003 * for close, else return 0.
3006 connection_state_is_open(connection_t
*conn
)
3010 if (conn
->marked_for_close
)
3013 if ((conn
->type
== CONN_TYPE_OR
&& conn
->state
== OR_CONN_STATE_OPEN
) ||
3014 (conn
->type
== CONN_TYPE_AP
&& conn
->state
== AP_CONN_STATE_OPEN
) ||
3015 (conn
->type
== CONN_TYPE_EXIT
&& conn
->state
== EXIT_CONN_STATE_OPEN
) ||
3016 (conn
->type
== CONN_TYPE_CONTROL
&&
3017 conn
->state
== CONTROL_CONN_STATE_OPEN
))
3023 /** Return 1 if conn is in 'connecting' state, else return 0. */
3025 connection_state_is_connecting(connection_t
*conn
)
3029 if (conn
->marked_for_close
)
3034 return conn
->state
== OR_CONN_STATE_CONNECTING
;
3035 case CONN_TYPE_EXIT
:
3036 return conn
->state
== EXIT_CONN_STATE_CONNECTING
;
3038 return conn
->state
== DIR_CONN_STATE_CONNECTING
;
3044 /** Allocates a base64'ed authenticator for use in http or https
3045 * auth, based on the input string <b>authenticator</b>. Returns it
3046 * if success, else returns NULL. */
3048 alloc_http_authenticator(const char *authenticator
)
3050 /* an authenticator in Basic authentication
3051 * is just the string "username:password" */
3052 const size_t authenticator_length
= strlen(authenticator
);
3053 /* The base64_encode function needs a minimum buffer length
3055 const size_t base64_authenticator_length
= (authenticator_length
/48+1)*66;
3056 char *base64_authenticator
= tor_malloc(base64_authenticator_length
);
3057 if (base64_encode(base64_authenticator
, base64_authenticator_length
,
3058 authenticator
, authenticator_length
) < 0) {
3059 tor_free(base64_authenticator
); /* free and set to null */
3061 /* remove extra \n at end of encoding */
3062 base64_authenticator
[strlen(base64_authenticator
) - 1] = 0;
3064 return base64_authenticator
;
3067 /** Given a socket handle, check whether the local address (sockname) of the
3068 * socket is one that we've connected from before. If so, double-check
3069 * whether our address has changed and we need to generate keys. If we do,
3073 client_check_address_changed(int sock
)
3075 uint32_t iface_ip
, ip_out
;
3076 struct sockaddr_in out_addr
;
3077 socklen_t out_addr_len
= (socklen_t
) sizeof(out_addr
);
3080 if (!last_interface_ip
)
3081 get_interface_address(LOG_INFO
, &last_interface_ip
);
3082 if (!outgoing_addrs
)
3083 outgoing_addrs
= smartlist_create();
3085 if (getsockname(sock
, (struct sockaddr
*)&out_addr
, &out_addr_len
)<0) {
3086 int e
= tor_socket_errno(sock
);
3087 log_warn(LD_NET
, "getsockname() to check for address change failed: %s",
3088 tor_socket_strerror(e
));
3092 /* If we've used this address previously, we're okay. */
3093 ip_out
= ntohl(out_addr
.sin_addr
.s_addr
);
3094 SMARTLIST_FOREACH(outgoing_addrs
, uint32_t*, ip_ptr
,
3095 if (*ip_ptr
== ip_out
) return;
3098 /* Uh-oh. We haven't connected from this address before. Has the interface
3099 * address changed? */
3100 if (get_interface_address(LOG_INFO
, &iface_ip
)<0)
3102 ip
= tor_malloc(sizeof(uint32_t));
3105 if (iface_ip
== last_interface_ip
) {
3106 /* Nope, it hasn't changed. Add this address to the list. */
3107 smartlist_add(outgoing_addrs
, ip
);
3109 /* The interface changed. We're a client, so we need to regenerate our
3110 * keys. First, reset the state. */
3111 log(LOG_NOTICE
, LD_NET
, "Our IP address has changed. Rotating keys...");
3112 last_interface_ip
= iface_ip
;
3113 SMARTLIST_FOREACH(outgoing_addrs
, void*, ip_ptr
, tor_free(ip_ptr
));
3114 smartlist_clear(outgoing_addrs
);
3115 smartlist_add(outgoing_addrs
, ip
);
3116 /* Okay, now change our keys. */
3117 ip_address_changed(1);
3121 /** Some systems have limited system buffers for recv and xmit on
3122 * sockets allocated in a virtual server or similar environment. For a Tor
3123 * server this can produce the "Error creating network socket: No buffer
3124 * space available" error once all available TCP buffer space is consumed.
3125 * This method will attempt to constrain the buffers allocated for the socket
3126 * to the desired size to stay below system TCP buffer limits.
3129 set_constrained_socket_buffers(int sock
, int size
)
3131 void *sz
= (void*)&size
;
3132 socklen_t sz_sz
= (socklen_t
) sizeof(size
);
3133 if (setsockopt(sock
, SOL_SOCKET
, SO_SNDBUF
, sz
, sz_sz
) < 0) {
3134 int e
= tor_socket_errno(sock
);
3135 log_warn(LD_NET
, "setsockopt() to constrain send "
3136 "buffer to %d bytes failed: %s", size
, tor_socket_strerror(e
));
3138 if (setsockopt(sock
, SOL_SOCKET
, SO_RCVBUF
, sz
, sz_sz
) < 0) {
3139 int e
= tor_socket_errno(sock
);
3140 log_warn(LD_NET
, "setsockopt() to constrain recv "
3141 "buffer to %d bytes failed: %s", size
, tor_socket_strerror(e
));
3145 /** Process new bytes that have arrived on conn-\>inbuf.
3147 * This function just passes conn to the connection-specific
3148 * connection_*_process_inbuf() function. It also passes in
3149 * package_partial if wanted.
3152 connection_process_inbuf(connection_t
*conn
, int package_partial
)
3156 switch (conn
->type
) {
3158 return connection_or_process_inbuf(TO_OR_CONN(conn
));
3159 case CONN_TYPE_EXIT
:
3161 return connection_edge_process_inbuf(TO_EDGE_CONN(conn
),
3164 return connection_dir_process_inbuf(TO_DIR_CONN(conn
));
3165 case CONN_TYPE_CPUWORKER
:
3166 return connection_cpu_process_inbuf(conn
);
3167 case CONN_TYPE_CONTROL
:
3168 return connection_control_process_inbuf(TO_CONTROL_CONN(conn
));
3170 log_err(LD_BUG
,"got unexpected conn type %d.", conn
->type
);
3171 tor_fragile_assert();
3176 /** Called whenever we've written data on a connection. */
3178 connection_flushed_some(connection_t
*conn
)
3181 tor_assert(!conn
->in_flushed_some
);
3182 conn
->in_flushed_some
= 1;
3183 if (conn
->type
== CONN_TYPE_DIR
&&
3184 conn
->state
== DIR_CONN_STATE_SERVER_WRITING
) {
3185 r
= connection_dirserv_flushed_some(TO_DIR_CONN(conn
));
3186 } else if (conn
->type
== CONN_TYPE_OR
) {
3187 r
= connection_or_flushed_some(TO_OR_CONN(conn
));
3189 conn
->in_flushed_some
= 0;
3193 /** We just finished flushing bytes from conn-\>outbuf, and there
3194 * are no more bytes remaining.
3196 * This function just passes conn to the connection-specific
3197 * connection_*_finished_flushing() function.
3200 connection_finished_flushing(connection_t
*conn
)
3204 /* If the connection is closed, don't try to do anything more here. */
3205 if (CONN_IS_CLOSED(conn
))
3208 // log_fn(LOG_DEBUG,"entered. Socket %u.", conn->s);
3210 switch (conn
->type
) {
3212 return connection_or_finished_flushing(TO_OR_CONN(conn
));
3214 case CONN_TYPE_EXIT
:
3215 return connection_edge_finished_flushing(TO_EDGE_CONN(conn
));
3217 return connection_dir_finished_flushing(TO_DIR_CONN(conn
));
3218 case CONN_TYPE_CPUWORKER
:
3219 return connection_cpu_finished_flushing(conn
);
3220 case CONN_TYPE_CONTROL
:
3221 return connection_control_finished_flushing(TO_CONTROL_CONN(conn
));
3223 log_err(LD_BUG
,"got unexpected conn type %d.", conn
->type
);
3224 tor_fragile_assert();
3229 /** Called when our attempt to connect() to another server has just
3232 * This function just passes conn to the connection-specific
3233 * connection_*_finished_connecting() function.
3236 connection_finished_connecting(connection_t
*conn
)
3242 return connection_or_finished_connecting(TO_OR_CONN(conn
));
3243 case CONN_TYPE_EXIT
:
3244 return connection_edge_finished_connecting(TO_EDGE_CONN(conn
));
3246 return connection_dir_finished_connecting(TO_DIR_CONN(conn
));
3248 log_err(LD_BUG
,"got unexpected conn type %d.", conn
->type
);
3249 tor_fragile_assert();
3254 /** Callback: invoked when a connection reaches an EOF event. */
3256 connection_reached_eof(connection_t
*conn
)
3258 switch (conn
->type
) {
3260 return connection_or_reached_eof(TO_OR_CONN(conn
));
3262 case CONN_TYPE_EXIT
:
3263 return connection_edge_reached_eof(TO_EDGE_CONN(conn
));
3265 return connection_dir_reached_eof(TO_DIR_CONN(conn
));
3266 case CONN_TYPE_CPUWORKER
:
3267 return connection_cpu_reached_eof(conn
);
3268 case CONN_TYPE_CONTROL
:
3269 return connection_control_reached_eof(TO_CONTROL_CONN(conn
));
3271 log_err(LD_BUG
,"got unexpected conn type %d.", conn
->type
);
3272 tor_fragile_assert();
3277 /** Log how many bytes are used by buffers of different kinds and sizes. */
3279 connection_dump_buffer_mem_stats(int severity
)
3281 uint64_t used_by_type
[_CONN_TYPE_MAX
+1];
3282 uint64_t alloc_by_type
[_CONN_TYPE_MAX
+1];
3283 int n_conns_by_type
[_CONN_TYPE_MAX
+1];
3284 uint64_t total_alloc
= 0;
3285 uint64_t total_used
= 0;
3287 smartlist_t
*conns
= get_connection_array();
3289 memset(used_by_type
, 0, sizeof(used_by_type
));
3290 memset(alloc_by_type
, 0, sizeof(alloc_by_type
));
3291 memset(n_conns_by_type
, 0, sizeof(n_conns_by_type
));
3293 SMARTLIST_FOREACH(conns
, connection_t
*, c
,
3296 ++n_conns_by_type
[tp
];
3298 used_by_type
[tp
] += buf_datalen(c
->inbuf
);
3299 alloc_by_type
[tp
] += buf_allocation(c
->inbuf
);
3302 used_by_type
[tp
] += buf_datalen(c
->outbuf
);
3303 alloc_by_type
[tp
] += buf_allocation(c
->outbuf
);
3306 for (i
=0; i
<= _CONN_TYPE_MAX
; ++i
) {
3307 total_used
+= used_by_type
[i
];
3308 total_alloc
+= alloc_by_type
[i
];
3311 log(severity
, LD_GENERAL
,
3312 "In buffers for %d connections: "U64_FORMAT
" used/"U64_FORMAT
" allocated",
3313 smartlist_len(conns
),
3314 U64_PRINTF_ARG(total_used
), U64_PRINTF_ARG(total_alloc
));
3315 for (i
=_CONN_TYPE_MIN
; i
<= _CONN_TYPE_MAX
; ++i
) {
3316 if (!n_conns_by_type
[i
])
3318 log(severity
, LD_GENERAL
,
3319 " For %d %s connections: "U64_FORMAT
" used/"U64_FORMAT
" allocated",
3320 n_conns_by_type
[i
], conn_type_to_string(i
),
3321 U64_PRINTF_ARG(used_by_type
[i
]), U64_PRINTF_ARG(alloc_by_type
[i
]));
3325 /** Verify that connection <b>conn</b> has all of its invariants
3326 * correct. Trigger an assert if anything is invalid.
3329 assert_connection_ok(connection_t
*conn
, time_t now
)
3331 (void) now
; /* XXXX unused. */
3333 tor_assert(conn
->type
>= _CONN_TYPE_MIN
);
3334 tor_assert(conn
->type
<= _CONN_TYPE_MAX
);
3335 switch (conn
->type
) {
3337 tor_assert(conn
->magic
== OR_CONNECTION_MAGIC
);
3340 case CONN_TYPE_EXIT
:
3341 tor_assert(conn
->magic
== EDGE_CONNECTION_MAGIC
);
3344 tor_assert(conn
->magic
== DIR_CONNECTION_MAGIC
);
3346 case CONN_TYPE_CONTROL
:
3347 tor_assert(conn
->magic
== CONTROL_CONNECTION_MAGIC
);
3350 tor_assert(conn
->magic
== BASE_CONNECTION_MAGIC
);
3354 if (conn
->linked_conn
) {
3355 tor_assert(conn
->linked_conn
->linked_conn
== conn
);
3356 tor_assert(conn
->linked
);
3359 tor_assert(conn
->s
< 0);
3361 if (conn
->outbuf_flushlen
> 0) {
3362 tor_assert(connection_is_writing(conn
) || conn
->write_blocked_on_bw
||
3363 (CONN_IS_EDGE(conn
) && TO_EDGE_CONN(conn
)->edge_blocked_on_circ
));
3366 if (conn
->hold_open_until_flushed
)
3367 tor_assert(conn
->marked_for_close
);
3369 /* XXXX check: read_blocked_on_bw, write_blocked_on_bw, s, conn_array_index,
3370 * marked_for_close. */
3373 if (!connection_is_listener(conn
)) {
3374 assert_buf_ok(conn
->inbuf
);
3375 assert_buf_ok(conn
->outbuf
);
3378 if (conn
->type
== CONN_TYPE_OR
) {
3379 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
3380 if (conn
->state
== OR_CONN_STATE_OPEN
) {
3381 /* tor_assert(conn->bandwidth > 0); */
3382 /* the above isn't necessarily true: if we just did a TLS
3383 * handshake but we didn't recognize the other peer, or it
3384 * gave a bad cert/etc, then we won't have assigned bandwidth,
3385 * yet it will be open. -RD
3387 // tor_assert(conn->read_bucket >= 0);
3389 // tor_assert(conn->addr && conn->port);
3390 tor_assert(conn
->address
);
3391 if (conn
->state
> OR_CONN_STATE_PROXY_HANDSHAKING
)
3392 tor_assert(or_conn
->tls
);
3395 if (CONN_IS_EDGE(conn
)) {
3396 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
3397 if (edge_conn
->chosen_exit_optional
|| edge_conn
->chosen_exit_retries
) {
3398 tor_assert(conn
->type
== CONN_TYPE_AP
);
3399 tor_assert(edge_conn
->chosen_exit_name
);
3402 /* XXX unchecked: package window, deliver window. */
3403 if (conn
->type
== CONN_TYPE_AP
) {
3405 tor_assert(edge_conn
->socks_request
);
3406 if (conn
->state
== AP_CONN_STATE_OPEN
) {
3407 tor_assert(edge_conn
->socks_request
->has_finished
);
3408 if (!conn
->marked_for_close
) {
3409 tor_assert(edge_conn
->cpath_layer
);
3410 assert_cpath_layer_ok(edge_conn
->cpath_layer
);
3414 if (conn
->type
== CONN_TYPE_EXIT
) {
3415 tor_assert(conn
->purpose
== EXIT_PURPOSE_CONNECT
||
3416 conn
->purpose
== EXIT_PURPOSE_RESOLVE
);
3418 } else if (conn
->type
== CONN_TYPE_DIR
) {
3420 /* Purpose is only used for dir and exit types currently */
3421 tor_assert(!conn
->purpose
);
3426 case CONN_TYPE_OR_LISTENER
:
3427 case CONN_TYPE_AP_LISTENER
:
3428 case CONN_TYPE_AP_TRANS_LISTENER
:
3429 case CONN_TYPE_AP_NATD_LISTENER
:
3430 case CONN_TYPE_DIR_LISTENER
:
3431 case CONN_TYPE_CONTROL_LISTENER
:
3432 case CONN_TYPE_AP_DNS_LISTENER
:
3433 tor_assert(conn
->state
== LISTENER_STATE_READY
);
3436 tor_assert(conn
->state
>= _OR_CONN_STATE_MIN
);
3437 tor_assert(conn
->state
<= _OR_CONN_STATE_MAX
);
3438 tor_assert(TO_OR_CONN(conn
)->n_circuits
>= 0);
3440 case CONN_TYPE_EXIT
:
3441 tor_assert(conn
->state
>= _EXIT_CONN_STATE_MIN
);
3442 tor_assert(conn
->state
<= _EXIT_CONN_STATE_MAX
);
3443 tor_assert(conn
->purpose
>= _EXIT_PURPOSE_MIN
);
3444 tor_assert(conn
->purpose
<= _EXIT_PURPOSE_MAX
);
3447 tor_assert(conn
->state
>= _AP_CONN_STATE_MIN
);
3448 tor_assert(conn
->state
<= _AP_CONN_STATE_MAX
);
3449 tor_assert(TO_EDGE_CONN(conn
)->socks_request
);
3452 tor_assert(conn
->state
>= _DIR_CONN_STATE_MIN
);
3453 tor_assert(conn
->state
<= _DIR_CONN_STATE_MAX
);
3454 tor_assert(conn
->purpose
>= _DIR_PURPOSE_MIN
);
3455 tor_assert(conn
->purpose
<= _DIR_PURPOSE_MAX
);
3457 case CONN_TYPE_CPUWORKER
:
3458 tor_assert(conn
->state
>= _CPUWORKER_STATE_MIN
);
3459 tor_assert(conn
->state
<= _CPUWORKER_STATE_MAX
);
3461 case CONN_TYPE_CONTROL
:
3462 tor_assert(conn
->state
>= _CONTROL_CONN_STATE_MIN
);
3463 tor_assert(conn
->state
<= _CONTROL_CONN_STATE_MAX
);