1 /* Copyright (c) 2001 Matej Pfajfar.
2 * Copyright (c) 2001-2004, Roger Dingledine.
3 * Copyright (c) 2004-2007, Roger Dingledine, Nick Mathewson. */
4 /* See LICENSE for licensing information */
9 * \brief Master header file for Tor-specific functionality.
14 #define OR_H_ID "$Id$"
18 #define WIN32_WINNT 0x400
19 #define _WIN32_WINNT 0x400
20 #define WIN32_LEAN_AND_MEAN
32 #ifdef HAVE_SYS_PARAM_H
33 #include <sys/param.h> /* FreeBSD needs this to know what version it is */
36 #ifdef HAVE_SYS_WAIT_H
39 #ifdef HAVE_SYS_FCNTL_H
40 #include <sys/fcntl.h>
45 #ifdef HAVE_SYS_IOCTL_H
46 #include <sys/ioctl.h>
51 #ifdef HAVE_SYS_STAT_H
54 #ifdef HAVE_ARPA_INET_H
55 #include <arpa/inet.h>
67 /** Upper bound on maximum simultaneous connections; can be lowered by
69 #if defined(CYGWIN) || defined(__CYGWIN__)
70 /* http://archives.seul.org/or/talk/Aug-2006/msg00210.html */
71 #define MAXCONNECTIONS 3200
73 /* very high by default. "nobody should need more than this..." */
74 #define MAXCONNECTIONS 15000
82 #define snprintf _snprintf
89 #include "container.h"
95 /* These signals are defined to help control_signal_act work.
112 /* Controller signals start at a high number so we don't
113 * conflict with system-defined signals. */
114 #define SIGNEWNYM 129
115 #define SIGCLEARDNSCACHE 130
117 #if (SIZEOF_CELL_T != 0)
118 /* On Irix, stdlib.h defines a cell_t type, so we need to make sure
119 * that our stuff always calls cell_t something different. */
120 #define cell_t tor_cell_t
123 /** Length of longest allowable configured nickname. */
124 #define MAX_NICKNAME_LEN 19
125 /** Length of a router identity encoded as a hexadecimal digest, plus
126 * possible dollar sign. */
127 #define MAX_HEX_NICKNAME_LEN (HEX_DIGEST_LEN+1)
128 /** Maximum length of verbose router identifier: dollar sign, hex ID digest,
129 * equal sign or tilde, nickname. */
130 #define MAX_VERBOSE_NICKNAME_LEN (1+HEX_DIGEST_LEN+1+MAX_NICKNAME_LEN)
132 /** Maximum size, in bytes, for resized buffers. */
133 #define MAX_BUF_SIZE ((1<<24)-1) /* 16MB-1 */
134 /** Maximum size, in bytes, for any directory object that we've downloaded. */
135 #define MAX_DIR_DL_SIZE MAX_BUF_SIZE
137 /** For http parsing: Maximum number of bytes we'll accept in the headers
138 * of an HTTP request or response. */
139 #define MAX_HEADERS_SIZE 50000
140 /** Maximum size, in bytes, for any directory object that we're accepting
142 #define MAX_DIR_UL_SIZE 500000
144 /** How long do we keep DNS cache entries before purging them (regardless of
146 #define MAX_DNS_ENTRY_AGE (30*60)
147 /** How long do we cache/tell clients to cache DNS records when no TTL is
149 #define DEFAULT_DNS_TTL (30*60)
150 /** How long can a TTL be before we stop believing it? */
151 #define MAX_DNS_TTL (3*60*60)
152 /** How small can a TTL be before we stop believing it? Provides rudimentary
154 #define MIN_DNS_TTL (60)
156 /** How often do we rotate onion keys? */
157 #define MIN_ONION_KEY_LIFETIME (7*24*60*60)
158 /** How often do we rotate TLS contexts? */
159 #define MAX_SSL_KEY_LIFETIME (2*60*60)
161 /** How old do we allow a router to get before removing it
162 * from the router list? In seconds. */
163 #define ROUTER_MAX_AGE (60*60*48)
164 /** How old can a router get before we (as a server) will no longer
165 * consider it live? In seconds. */
166 #define ROUTER_MAX_AGE_TO_PUBLISH (60*60*20)
167 /** How old do we let a saved descriptor get before force-removing it? */
168 #define OLD_ROUTER_DESC_MAX_AGE (60*60*24*5)
170 /** Possible rules for generating circuit IDs on an OR connection. */
172 CIRC_ID_TYPE_LOWER
=0, /**< Pick from 0..1<<15-1. */
173 CIRC_ID_TYPE_HIGHER
=1, /**< Pick from 1<<15..1<<16-1. */
174 /** The other side of a connection is an OP: never create circuits to it,
175 * and let it use any circuit ID it wants. */
176 CIRC_ID_TYPE_NEITHER
=2
179 #define _CONN_TYPE_MIN 3
180 /** Type for sockets listening for OR connections. */
181 #define CONN_TYPE_OR_LISTENER 3
182 /** A bidirectional TLS connection transmitting a sequence of cells.
183 * May be from an OR to an OR, or from an OP to an OR. */
184 #define CONN_TYPE_OR 4
185 /** A TCP connection from an onion router to a stream's destination. */
186 #define CONN_TYPE_EXIT 5
187 /** Type for sockets listening for SOCKS connections. */
188 #define CONN_TYPE_AP_LISTENER 6
189 /** A SOCKS proxy connection from the user application to the onion
191 #define CONN_TYPE_AP 7
192 /** Type for sockets listening for HTTP connections to the directory server. */
193 #define CONN_TYPE_DIR_LISTENER 8
194 /** Type for HTTP connections to the directory server. */
195 #define CONN_TYPE_DIR 9
196 /** Connection from the main process to a CPU worker process. */
197 #define CONN_TYPE_CPUWORKER 10
198 /** Type for listening for connections from user interface process. */
199 #define CONN_TYPE_CONTROL_LISTENER 11
200 /** Type for connections from user interface process. */
201 #define CONN_TYPE_CONTROL 12
202 /** Type for sockets listening for transparent connections redirected by pf or
204 #define CONN_TYPE_AP_TRANS_LISTENER 13
205 /** Type for sockets listening for transparent connections redirected by
207 #define CONN_TYPE_AP_NATD_LISTENER 14
208 /** Type for sockets listening for DNS requests. */
209 #define CONN_TYPE_AP_DNS_LISTENER 15
210 #define _CONN_TYPE_MAX 15
211 /* !!!! If _CONN_TYPE_MAX is ever over 15, we must grow the type field in
214 #define CONN_IS_EDGE(x) \
215 ((x)->type == CONN_TYPE_EXIT || (x)->type == CONN_TYPE_AP)
217 /** State for any listener connection. */
218 #define LISTENER_STATE_READY 0
220 #define _CPUWORKER_STATE_MIN 1
221 /** State for a connection to a cpuworker process that's idle. */
222 #define CPUWORKER_STATE_IDLE 1
223 /** State for a connection to a cpuworker process that's processing a
225 #define CPUWORKER_STATE_BUSY_ONION 2
226 #define _CPUWORKER_STATE_MAX 2
228 #define CPUWORKER_TASK_ONION CPUWORKER_STATE_BUSY_ONION
230 #define _OR_CONN_STATE_MIN 1
231 /** State for a connection to an OR: waiting for connect() to finish. */
232 #define OR_CONN_STATE_CONNECTING 1
233 /** State for a connection to an OR: waiting for proxy command to flush. */
234 #define OR_CONN_STATE_PROXY_FLUSHING 2
235 /** State for a connection to an OR: waiting for proxy response. */
236 #define OR_CONN_STATE_PROXY_READING 3
237 /** State for a connection to an OR: SSL is handshaking, not done yet. */
238 #define OR_CONN_STATE_HANDSHAKING 4
239 /** State for a connection to an OR: Ready to send/receive cells. */
240 #define OR_CONN_STATE_OPEN 5
241 #define _OR_CONN_STATE_MAX 5
243 #define _EXIT_CONN_STATE_MIN 1
244 /** State for an exit connection: waiting for response from dns farm. */
245 #define EXIT_CONN_STATE_RESOLVING 1
246 /** State for an exit connection: waiting for connect() to finish. */
247 #define EXIT_CONN_STATE_CONNECTING 2
248 /** State for an exit connection: open and ready to transmit data. */
249 #define EXIT_CONN_STATE_OPEN 3
250 /** State for an exit connection: waiting to be removed. */
251 #define EXIT_CONN_STATE_RESOLVEFAILED 4
252 #define _EXIT_CONN_STATE_MAX 4
254 /* The AP state values must be disjoint from the EXIT state values. */
255 #define _AP_CONN_STATE_MIN 5
256 /** State for a SOCKS connection: waiting for SOCKS request. */
257 #define AP_CONN_STATE_SOCKS_WAIT 5
258 /** State for a SOCKS connection: got a y.onion URL; waiting to receive
259 * rendezvous descriptor. */
260 #define AP_CONN_STATE_RENDDESC_WAIT 6
261 /** The controller will attach this connection to a circuit; it isn't our
263 #define AP_CONN_STATE_CONTROLLER_WAIT 7
264 /** State for a SOCKS connection: waiting for a completed circuit. */
265 #define AP_CONN_STATE_CIRCUIT_WAIT 8
266 /** State for a SOCKS connection: sent BEGIN, waiting for CONNECTED. */
267 #define AP_CONN_STATE_CONNECT_WAIT 9
268 /** State for a SOCKS connection: sent RESOLVE, waiting for RESOLVED. */
269 #define AP_CONN_STATE_RESOLVE_WAIT 10
270 /** State for a SOCKS connection: ready to send and receive. */
271 #define AP_CONN_STATE_OPEN 11
272 /** State for a transparent natd connection: waiting for original
274 #define AP_CONN_STATE_NATD_WAIT 12
275 #define _AP_CONN_STATE_MAX 12
277 /** True iff the AP_CONN_STATE_* value <b>s</b> means that the corresponding
278 * edge connection is not attached to any circuit. */
279 #define AP_CONN_STATE_IS_UNATTACHED(s) \
280 ((s) <= AP_CONN_STATE_CIRCUIT_WAIT || (s) == AP_CONN_STATE_NATD_WAIT)
282 #define _DIR_CONN_STATE_MIN 1
283 /** State for connection to directory server: waiting for connect(). */
284 #define DIR_CONN_STATE_CONNECTING 1
285 /** State for connection to directory server: sending HTTP request. */
286 #define DIR_CONN_STATE_CLIENT_SENDING 2
287 /** State for connection to directory server: reading HTTP response. */
288 #define DIR_CONN_STATE_CLIENT_READING 3
289 /** State for connection to directory server: happy and finished. */
290 #define DIR_CONN_STATE_CLIENT_FINISHED 4
291 /** State for connection at directory server: waiting for HTTP request. */
292 #define DIR_CONN_STATE_SERVER_COMMAND_WAIT 5
293 /** State for connection at directory server: sending HTTP response. */
294 #define DIR_CONN_STATE_SERVER_WRITING 6
295 #define _DIR_CONN_STATE_MAX 6
297 /** True iff the purpose of <b>conn</b> means that it's a server-side
298 * directory connection. */
299 #define DIR_CONN_IS_SERVER(conn) ((conn)->purpose == DIR_PURPOSE_SERVER)
301 #define _CONTROL_CONN_STATE_MIN 1
302 /** State for a control connection: Authenticated and accepting v1 commands. */
303 #define CONTROL_CONN_STATE_OPEN 1
304 /** State for a control connection: Waiting for authentication; speaking
306 #define CONTROL_CONN_STATE_NEEDAUTH 2
307 #define _CONTROL_CONN_STATE_MAX 2
309 #define _DIR_PURPOSE_MIN 1
310 /** A connection to a directory server: download a directory. */
311 #define DIR_PURPOSE_FETCH_DIR 1
312 /** A connection to a directory server: download just the list
313 * of running routers. */
314 #define DIR_PURPOSE_FETCH_RUNNING_LIST 2
315 /** A connection to a directory server: download a rendezvous
317 #define DIR_PURPOSE_FETCH_RENDDESC 3
318 /** A connection to a directory server: set after a rendezvous
319 * descriptor is downloaded. */
320 #define DIR_PURPOSE_HAS_FETCHED_RENDDESC 4
321 /** A connection to a directory server: download one or more network-status
323 #define DIR_PURPOSE_FETCH_NETWORKSTATUS 5
324 /** A connection to a directory server: download one or more server
326 #define DIR_PURPOSE_FETCH_SERVERDESC 6
327 /** A connection to a directory server: download one or more extra-info
329 #define DIR_PURPOSE_FETCH_EXTRAINFO 7
330 /** A connection to a directory server: upload a server descriptor. */
331 #define DIR_PURPOSE_UPLOAD_DIR 8
332 /** A connection to a directory server: upload a rendezvous
334 #define DIR_PURPOSE_UPLOAD_RENDDESC 9
335 /** A connection to a directory server: upload a v3 networkstatus vote. */
336 #define DIR_PURPOSE_UPLOAD_VOTE 10
337 /** A connection to a directory server: upload a v3 consensus signature */
338 #define DIR_PURPOSE_UPLOAD_SIGNATURES 11
339 /** A connection to a directory server: download one or more network-status
341 #define DIR_PURPOSE_FETCH_STATUS_VOTE 12
342 /** A connection to a directory server: download one or more network-status
344 #define DIR_PURPOSE_FETCH_DETACHED_SIGNATURES 13
345 /** A connection to a directory server: download one or more network-status
347 #define DIR_PURPOSE_FETCH_CONSENSUS 14
348 /** A connection to a directory server: download one or more network-status
350 #define DIR_PURPOSE_FETCH_CERTIFICATE 15
352 /** Purpose for connection at a directory server. */
353 #define DIR_PURPOSE_SERVER 16
354 #define _DIR_PURPOSE_MAX 16
356 #define _EXIT_PURPOSE_MIN 1
357 /** This exit stream wants to do an ordinary connect. */
358 #define EXIT_PURPOSE_CONNECT 1
359 /** This exit stream wants to do a resolve (either normal or reverse). */
360 #define EXIT_PURPOSE_RESOLVE 2
361 #define _EXIT_PURPOSE_MAX 2
363 /* !!!! If any connection purpose is ever over over 31, we must grow the type
364 * field in connection_t. */
366 /** Circuit state: I'm the origin, still haven't done all my handshakes. */
367 #define CIRCUIT_STATE_BUILDING 0
368 /** Circuit state: Waiting to process the onionskin. */
369 #define CIRCUIT_STATE_ONIONSKIN_PENDING 1
370 /** Circuit state: I'd like to deliver a create, but my n_conn is still
372 #define CIRCUIT_STATE_OR_WAIT 2
373 /** Circuit state: onionskin(s) processed, ready to send/receive cells. */
374 #define CIRCUIT_STATE_OPEN 3
376 #define _CIRCUIT_PURPOSE_MIN 1
378 /* these circuits were initiated elsewhere */
379 #define _CIRCUIT_PURPOSE_OR_MIN 1
380 /** OR-side circuit purpose: normal circuit, at OR. */
381 #define CIRCUIT_PURPOSE_OR 1
382 /** OR-side circuit purpose: At OR, from Bob, waiting for intro from Alices. */
383 #define CIRCUIT_PURPOSE_INTRO_POINT 2
384 /** OR-side circuit purpose: At OR, from Alice, waiting for Bob. */
385 #define CIRCUIT_PURPOSE_REND_POINT_WAITING 3
386 /** OR-side circuit purpose: At OR, both circuits have this purpose. */
387 #define CIRCUIT_PURPOSE_REND_ESTABLISHED 4
388 #define _CIRCUIT_PURPOSE_OR_MAX 4
390 /* these circuits originate at this node */
392 /* here's how circ client-side purposes work:
393 * normal circuits are C_GENERAL.
394 * circuits that are c_introducing are either on their way to
395 * becoming open, or they are open and waiting for a
396 * suitable rendcirc before they send the intro.
397 * circuits that are c_introduce_ack_wait have sent the intro,
398 * but haven't gotten a response yet.
399 * circuits that are c_establish_rend are either on their way
400 * to becoming open, or they are open and have sent the
401 * establish_rendezvous cell but haven't received an ack.
402 * circuits that are c_rend_ready are open and have received a
403 * rend ack, but haven't heard from bob yet. if they have a
404 * buildstate->pending_final_cpath then they're expecting a
405 * cell from bob, else they're not.
406 * circuits that are c_rend_ready_intro_acked are open, and
407 * some intro circ has sent its intro and received an ack.
408 * circuits that are c_rend_joined are open, have heard from
409 * bob, and are talking to him.
411 /** Client-side circuit purpose: Normal circuit, with cpath. */
412 #define CIRCUIT_PURPOSE_C_GENERAL 5
413 /** Client-side circuit purpose: at Alice, connecting to intro point. */
414 #define CIRCUIT_PURPOSE_C_INTRODUCING 6
415 /** Client-side circuit purpose: at Alice, sent INTRODUCE1 to intro point,
416 * waiting for ACK/NAK. */
417 #define CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT 7
418 /** Client-side circuit purpose: at Alice, introduced and acked, closing. */
419 #define CIRCUIT_PURPOSE_C_INTRODUCE_ACKED 8
420 /** Client-side circuit purpose: at Alice, waiting for ack. */
421 #define CIRCUIT_PURPOSE_C_ESTABLISH_REND 9
422 /** Client-side circuit purpose: at Alice, waiting for Bob. */
423 #define CIRCUIT_PURPOSE_C_REND_READY 10
424 /** Client-side circuit purpose: at Alice, waiting for Bob, INTRODUCE
425 * has been acknowledged. */
426 #define CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED 11
427 /** Client-side circuit purpose: at Alice, rendezvous established. */
428 #define CIRCUIT_PURPOSE_C_REND_JOINED 12
430 /** Hidden-service-side circuit purpose: at Bob, waiting for introductions. */
431 #define CIRCUIT_PURPOSE_S_ESTABLISH_INTRO 13
432 /** Hidden-service-side circuit purpose: at Bob, successfully established
434 #define CIRCUIT_PURPOSE_S_INTRO 14
435 /** Hidden-service-side circuit purpose: at Bob, connecting to rend point. */
436 #define CIRCUIT_PURPOSE_S_CONNECT_REND 15
437 /** Hidden-service-side circuit purpose: at Bob, rendezvous established. */
438 #define CIRCUIT_PURPOSE_S_REND_JOINED 16
439 /** A testing circuit; not meant to be used for actual traffic. */
440 #define CIRCUIT_PURPOSE_TESTING 17
441 /** A controller made this circuit and Tor should not use it. */
442 #define CIRCUIT_PURPOSE_CONTROLLER 18
443 #define _CIRCUIT_PURPOSE_MAX 18
444 /** A catch-all for unrecognized purposes. Currently we don't expect
445 * to make or see any circuits with this purpose. */
446 #define CIRCUIT_PURPOSE_UNKNOWN 255
448 /** True iff the circuit purpose <b>p</b> is for a circuit that
449 * originated at this node. */
450 #define CIRCUIT_PURPOSE_IS_ORIGIN(p) ((p)>_CIRCUIT_PURPOSE_OR_MAX)
451 #define CIRCUIT_IS_ORIGIN(c) (CIRCUIT_PURPOSE_IS_ORIGIN((c)->purpose))
453 /** How many circuits do we want simultaneously in-progress to handle
455 #define MIN_CIRCUITS_HANDLING_STREAM 2
457 #define RELAY_COMMAND_BEGIN 1
458 #define RELAY_COMMAND_DATA 2
459 #define RELAY_COMMAND_END 3
460 #define RELAY_COMMAND_CONNECTED 4
461 #define RELAY_COMMAND_SENDME 5
462 #define RELAY_COMMAND_EXTEND 6
463 #define RELAY_COMMAND_EXTENDED 7
464 #define RELAY_COMMAND_TRUNCATE 8
465 #define RELAY_COMMAND_TRUNCATED 9
466 #define RELAY_COMMAND_DROP 10
467 #define RELAY_COMMAND_RESOLVE 11
468 #define RELAY_COMMAND_RESOLVED 12
469 #define RELAY_COMMAND_BEGIN_DIR 13
471 #define RELAY_COMMAND_ESTABLISH_INTRO 32
472 #define RELAY_COMMAND_ESTABLISH_RENDEZVOUS 33
473 #define RELAY_COMMAND_INTRODUCE1 34
474 #define RELAY_COMMAND_INTRODUCE2 35
475 #define RELAY_COMMAND_RENDEZVOUS1 36
476 #define RELAY_COMMAND_RENDEZVOUS2 37
477 #define RELAY_COMMAND_INTRO_ESTABLISHED 38
478 #define RELAY_COMMAND_RENDEZVOUS_ESTABLISHED 39
479 #define RELAY_COMMAND_INTRODUCE_ACK 40
481 /* Reasons why an OR connection is closed */
482 #define END_OR_CONN_REASON_DONE 1
483 #define END_OR_CONN_REASON_TCP_REFUSED 2
484 #define END_OR_CONN_REASON_OR_IDENTITY 3
485 #define END_OR_CONN_REASON_TLS_CONNRESET 4 /* tls connection reset by peer */
486 #define END_OR_CONN_REASON_TLS_TIMEOUT 5
487 #define END_OR_CONN_REASON_TLS_NO_ROUTE 6 /* no route to host/net */
488 #define END_OR_CONN_REASON_TLS_IO_ERROR 7 /* tls read/write error */
489 #define END_OR_CONN_REASON_TLS_MISC 8
491 /* Reasons why we (or a remote OR) might close a stream. See tor-spec.txt for
492 * documentation of these. */
493 #define END_STREAM_REASON_MISC 1
494 #define END_STREAM_REASON_RESOLVEFAILED 2
495 #define END_STREAM_REASON_CONNECTREFUSED 3
496 #define END_STREAM_REASON_EXITPOLICY 4
497 #define END_STREAM_REASON_DESTROY 5
498 #define END_STREAM_REASON_DONE 6
499 #define END_STREAM_REASON_TIMEOUT 7
500 /* 8 is unallocated for historical reasons. */
501 #define END_STREAM_REASON_HIBERNATING 9
502 #define END_STREAM_REASON_INTERNAL 10
503 #define END_STREAM_REASON_RESOURCELIMIT 11
504 #define END_STREAM_REASON_CONNRESET 12
505 #define END_STREAM_REASON_TORPROTOCOL 13
506 #define END_STREAM_REASON_NOTDIRECTORY 14
508 /* These high-numbered end reasons are not part of the official spec,
509 * and are not intended to be put in relay end cells. They are here
510 * to be more informative when sending back socks replies to the
512 /* XXXX 256 is no longer used; feel free to reuse it. */
513 /** We were unable to attach the connection to any circuit at all. */
514 /* XXXX the ways we use this one don't make a lot of sense. */
515 #define END_STREAM_REASON_CANT_ATTACH 257
516 /** We can't connect to any directories at all, so we killed our streams
517 * before they can time out. */
518 #define END_STREAM_REASON_NET_UNREACHABLE 258
519 /** This is a SOCKS connection, and the client used (or misused) the SOCKS
520 * protocol in a way we couldn't handle. */
521 #define END_STREAM_REASON_SOCKSPROTOCOL 259
522 /** This is a transparent proxy connection, but we can't extract the original
523 * target address:port. */
524 #define END_STREAM_REASON_CANT_FETCH_ORIG_DEST 260
525 /** This is a connection on the NATD port, and the destination IP:Port was
526 * either ill-formed or out-of-range. */
527 #define END_STREAM_REASON_INVALID_NATD_DEST 261
529 /** Bitwise-and this value with endreason to mask out all flags. */
530 #define END_STREAM_REASON_MASK 511
532 /** Bitwise-or this with the argument to control_event_stream_status
533 * to indicate that the reason came from an END cell. */
534 #define END_STREAM_REASON_FLAG_REMOTE 512
535 /** Bitwise-or this with the argument to control_event_stream_status
536 * to indicate that we already sent a CLOSED stream event. */
537 #define END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED 1024
538 /** Bitwise-or this with endreason to indicate that we already sent
539 * a socks reply, and no further reply needs to be sent from
540 * connection_mark_unattached_ap(). */
541 #define END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED 2048
543 /** Reason for remapping an AP connection's address: we have a cached
545 #define REMAP_STREAM_SOURCE_CACHE 1
546 /** Reason for remapping an AP connection's address: the exit node told us an
548 #define REMAP_STREAM_SOURCE_EXIT 2
550 /* 'type' values to use in RESOLVED cells. Specified in tor-spec.txt. */
551 #define RESOLVED_TYPE_HOSTNAME 0
552 #define RESOLVED_TYPE_IPV4 4
553 #define RESOLVED_TYPE_IPV6 6
554 #define RESOLVED_TYPE_ERROR_TRANSIENT 0xF0
555 #define RESOLVED_TYPE_ERROR 0xF1
557 /* Negative reasons are internal: we never send them in a DESTROY or TRUNCATE
558 * call; they only go to the controller for tracking */
559 /** We couldn't build a path for this circuit. */
560 #define END_CIRC_REASON_NOPATH -2
561 /** Catch-all "other" reason for closing origin circuits. */
562 #define END_CIRC_AT_ORIGIN -1
564 /* Reasons why we (or a remote OR) might close a circuit. See tor-spec.txt for
565 * documentation of these. */
566 #define _END_CIRC_REASON_MIN 0
567 #define END_CIRC_REASON_NONE 0
568 #define END_CIRC_REASON_TORPROTOCOL 1
569 #define END_CIRC_REASON_INTERNAL 2
570 #define END_CIRC_REASON_REQUESTED 3
571 #define END_CIRC_REASON_HIBERNATING 4
572 #define END_CIRC_REASON_RESOURCELIMIT 5
573 #define END_CIRC_REASON_CONNECTFAILED 6
574 #define END_CIRC_REASON_OR_IDENTITY 7
575 #define END_CIRC_REASON_OR_CONN_CLOSED 8
576 #define END_CIRC_REASON_FINISHED 9
577 #define END_CIRC_REASON_TIMEOUT 10
578 #define END_CIRC_REASON_DESTROYED 11
579 #define END_CIRC_REASON_NOSUCHSERVICE 12
580 #define _END_CIRC_REASON_MAX 12
582 /** Bitwise-OR this with the argument to circuit_mark_for_close() or
583 * control_event_circuit_status() to indicate that the reason was
584 * passed through from a destroy or truncate cell. */
585 #define END_CIRC_REASON_FLAG_REMOTE 512
587 /** Length of 'y' portion of 'y.onion' URL. */
588 #define REND_SERVICE_ID_LEN 16
590 #define CELL_DIRECTION_IN 1
591 #define CELL_DIRECTION_OUT 2
594 #define CIRCWINDOW_START 10000
595 #define CIRCWINDOW_INCREMENT 1000
596 #define STREAMWINDOW_START 5000
597 #define STREAMWINDOW_INCREMENT 500
599 /** Initial value for both sides of a circuit transmission window when the
600 * circuit is initialized. Measured in cells. */
601 #define CIRCWINDOW_START 1000
602 /** Amount to increment a circuit window when we get a circuit SENDME. */
603 #define CIRCWINDOW_INCREMENT 100
604 /** Initial value on both sides of a stream transmission window when the
605 * stream is initialized. Measured in cells. */
606 #define STREAMWINDOW_START 500
607 /** Amount to increment a stream window when we get a stream SENDME. */
608 #define STREAMWINDOW_INCREMENT 50
612 #define CELL_PADDING 0
613 #define CELL_CREATE 1
614 #define CELL_CREATED 2
616 #define CELL_DESTROY 4
617 #define CELL_CREATE_FAST 5
618 #define CELL_CREATED_FAST 6
620 /** How long to test reachability before complaining to the user. */
621 #define TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT (20*60)
623 /** Legal characters in a nickname. */
624 #define LEGAL_NICKNAME_CHARACTERS \
625 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
627 /** Name to use in client TLS certificates if no nickname is given. */
628 #define DEFAULT_CLIENT_NICKNAME "client"
630 /** Number of bytes in a SOCKS4 header. */
631 #define SOCKS4_NETWORK_LEN 8
633 /** Specified SOCKS5 status codes. */
635 SOCKS5_SUCCEEDED
= 0x00,
636 SOCKS5_GENERAL_ERROR
= 0x01,
637 SOCKS5_NOT_ALLOWED
= 0x02,
638 SOCKS5_NET_UNREACHABLE
= 0x03,
639 SOCKS5_HOST_UNREACHABLE
= 0x04,
640 SOCKS5_CONNECTION_REFUSED
= 0x05,
641 SOCKS5_TTL_EXPIRED
= 0x06,
642 SOCKS5_COMMAND_NOT_SUPPORTED
= 0x07,
643 SOCKS5_ADDRESS_TYPE_NOT_SUPPORTED
= 0x08,
644 } socks5_reply_status_t
;
648 * Relay command [1 byte]
649 * Recognized [2 bytes]
650 * Stream ID [2 bytes]
651 * Partial SHA-1 [4 bytes]
653 * Relay payload [498 bytes]
656 /** Number of bytes in a cell, minus cell header. */
657 #define CELL_PAYLOAD_SIZE 509
658 /** Number of bytes in a cell transmitted over the network. */
659 #define CELL_NETWORK_SIZE 512
661 /** Number of bytes in a relay cell's header (not including general cell
663 #define RELAY_HEADER_SIZE (1+2+2+4+2)
664 /** Largest number of bytes that can fit in a relay cell payload. */
665 #define RELAY_PAYLOAD_SIZE (CELL_PAYLOAD_SIZE-RELAY_HEADER_SIZE)
667 typedef struct cell_t cell_t
;
668 /** Parsed onion routing cell. All communication between nodes
671 uint16_t circ_id
; /**< Circuit which received the cell. */
672 uint8_t command
; /**< Type of the cell: one of PADDING, CREATE, RELAY,
674 char payload
[CELL_PAYLOAD_SIZE
]; /**< Cell body. */
677 typedef struct packed_cell_t packed_cell_t
;
678 /** A cell as packed for writing to the network. */
679 struct packed_cell_t
{
680 struct packed_cell_t
*next
; /**< Next cell queued on this circuit. */
681 char body
[CELL_NETWORK_SIZE
]; /**< Cell as packed for network. */
684 /** A queue of cells on a circuit, waiting to be added to the
685 * or_connection_t's outbuf. */
686 typedef struct cell_queue_t
{
687 packed_cell_t
*head
; /**< The first cell, or NULL if the queue is empty. */
688 packed_cell_t
*tail
; /**< The last cell, or NULL if the queue is empty. */
689 int n
; /**< The number of cells in the queue. */
692 /** Beginning of a RELAY cell payload. */
694 uint8_t command
; /**< The end-to-end relay command. */
695 uint16_t recognized
; /**< Used to tell whether cell is for us. */
696 uint16_t stream_id
; /**< Which stream is this cell associated with? */
697 char integrity
[4]; /**< Used to tell whether cell is corrupted. */
698 uint16_t length
; /**< How long is the payload body? */
701 typedef struct buf_t buf_t
;
702 typedef struct socks_request_t socks_request_t
;
704 /* Values for connection_t.magic: used to make sure that downcasts (casts from
705 * connection_t to foo_connection_t) are safe. */
706 #define BASE_CONNECTION_MAGIC 0x7C3C304Eu
707 #define OR_CONNECTION_MAGIC 0x7D31FF03u
708 #define EDGE_CONNECTION_MAGIC 0xF0374013u
709 #define DIR_CONNECTION_MAGIC 0x9988ffeeu
710 #define CONTROL_CONNECTION_MAGIC 0x8abc765du
712 /** Description of a connection to another host or process, and associated
715 * A connection is named based on what it's connected to -- an "OR
716 * connection" has a Tor node on the other end, an "exit
717 * connection" has a website or other server on the other end, and an
718 * "AP connection" has an application proxy (and thus a user) on the
721 * Every connection has a type and a state. Connections never change
722 * their type, but can go through many state changes in their lifetime.
724 * Every connection has two associated input and output buffers.
725 * Listeners don't use them. For non-listener connections, incoming
726 * data is appended to conn->inbuf, and outgoing data is taken from
727 * conn->outbuf. Connections differ primarily in the functions called
728 * to fill and drain these buffers.
730 typedef struct connection_t
{
731 uint32_t magic
; /**< For memory debugging: must equal one of
732 * *_CONNECTION_MAGIC. */
734 uint8_t state
; /**< Current state of this connection. */
735 uint8_t type
:4; /**< What kind of connection is this? */
736 uint8_t purpose
:5; /**< Only used for DIR and EXIT types currently. */
738 /* The next fields are all one-bit booleans. Some are only applicable to
739 * connection subtypes, but we hold them here anyway, to save space.
741 unsigned read_blocked_on_bw
:1; /**< Boolean: should we start reading again
742 * once the bandwidth throttler allows it? */
743 unsigned write_blocked_on_bw
:1; /**< Boolean: should we start writing again
744 * once the bandwidth throttler allows reads? */
745 unsigned hold_open_until_flushed
:1; /**< Despite this connection's being
746 * marked for close, do we flush it
747 * before closing it? */
748 unsigned int inbuf_reached_eof
:1; /**< Boolean: did read() return 0 on this
750 unsigned int edge_has_sent_end
:1; /**< For debugging; only used on edge
751 * connections. Set once we've set the stream end,
752 * and check in connection_about_to_close_connection().
754 /** Edge connections only: true if we've blocked writing until the
755 * circuit has fewer queued cells. */
756 unsigned int edge_blocked_on_circ
:1;
757 /** Used for OR conns that shouldn't get any new circs attached to them. */
758 unsigned int or_is_obsolete
:1;
759 /** For AP connections only. If 1, and we fail to reach the chosen exit,
760 * stop requiring it. */
761 unsigned int chosen_exit_optional
:1;
762 /** Set to 1 when we're inside connection_flushed_some to keep us from
763 * calling connection_handle_write() recursively. */
764 unsigned int in_flushed_some
:1;
766 /* For linked connections:
768 unsigned int linked
:1; /**< True if there is, or has been, a linked_conn. */
769 /** True iff we'd like to be notified about read events from the
771 unsigned int reading_from_linked_conn
:1;
772 /** True iff we're willing to write to the linked conn. */
773 unsigned int writing_to_linked_conn
:1;
774 /** True iff we're currently able to read on the linked conn, and our
775 * read_event should be made active with libevent. */
776 unsigned int active_on_link
:1;
777 /** True iff we've called connection_close_immediate() on this linked
779 unsigned int linked_conn_is_closed
:1;
781 int s
; /**< Our socket; -1 if this connection is closed, or has no
783 int conn_array_index
; /**< Index into the global connection array. */
784 struct event
*read_event
; /**< Libevent event structure. */
785 struct event
*write_event
; /**< Libevent event structure. */
786 buf_t
*inbuf
; /**< Buffer holding data read over this connection. */
787 buf_t
*outbuf
; /**< Buffer holding data to write over this connection. */
788 size_t outbuf_flushlen
; /**< How much data should we try to flush from the
790 time_t timestamp_lastread
; /**< When was the last time libevent said we could
792 time_t timestamp_lastwritten
; /**< When was the last time libevent said we
794 time_t timestamp_created
; /**< When was this connection_t created? */
796 /* XXXX020 make this ipv6-capable */
797 int socket_family
; /**< Address family of this connection's socket. Usually
798 * AF_INET, but it can also be AF_UNIX, or in the future
800 uint32_t addr
; /**< IP of the other side of the connection; used to identify
801 * routers, along with port. */
802 uint16_t port
; /**< If non-zero, port on the other end
803 * of the connection. */
804 uint16_t marked_for_close
; /**< Should we close this conn on the next
805 * iteration of the main loop? (If true, holds
806 * the line number where this connection was
808 const char *marked_for_close_file
; /**< For debugging: in which file were
809 * we marked for close? */
810 char *address
; /**< FQDN (or IP) of the guy on the other end.
811 * strdup into this, because free_connection frees it. */
812 /** Annother connection that's connected to this one in lieu of a socket. */
813 struct connection_t
*linked_conn
;
815 /* XXXX020 move this into a subtype!!! */
816 struct evdns_server_port
*dns_server_port
;
820 /** Subtype of connection_t for an "OR connection" -- that is, one that speaks
822 typedef struct or_connection_t
{
825 /** Hash of the public RSA key for the other side's identity key, or zeroes
826 * if the other side hasn't shown us a valid identity key. */
827 char identity_digest
[DIGEST_LEN
];
828 char *nickname
; /**< Nickname of OR on other side (if any). */
830 tor_tls_t
*tls
; /**< TLS connection state. */
831 int tls_error
; /**< Last tor_tls error code. */
832 /** When we last used this conn for any client traffic. If not
833 * recent, we can rate limit it further. */
836 circ_id_type_t circ_id_type
:2; /**< When we send CREATE cells along this
837 * connection, which half of the space should
839 uint16_t next_circ_id
; /**< Which circ_id do we try to use next on
840 * this connection? This is always in the
841 * range 0..1<<15-1. */
843 time_t timestamp_lastempty
; /**< When was the outbuf last completely empty?*/
845 /* bandwidth* and read_bucket only used by ORs in OPEN state: */
846 int bandwidthrate
; /**< Bytes/s added to the bucket. (OPEN ORs only.) */
847 int bandwidthburst
; /**< Max bucket size for this conn. (OPEN ORs only.) */
848 int read_bucket
; /**< When this hits 0, stop receiving. Every second we
849 * add 'bandwidthrate' to this, capping it at
850 * bandwidthburst. (OPEN ORs only) */
851 int n_circuits
; /**< How many circuits use this connection as p_conn or
854 /** Double-linked ring of circuits with queued cells waiting for room to
855 * free up on this connection's outbuf. Every time we pull cells from a
856 * circuit, we advance this pointer to the next circuit in the ring. */
857 struct circuit_t
*active_circuits
;
858 struct or_connection_t
*next_with_same_id
; /**< Next connection with same
859 * identity digest as this one. */
862 /** Subtype of connection_t for an "edge connection" -- that is, a socks (ap)
863 * connection, or an exit. */
864 typedef struct edge_connection_t
{
867 struct edge_connection_t
*next_stream
; /**< Points to the next stream at this
869 struct crypt_path_t
*cpath_layer
; /**< A pointer to which node in the circ
870 * this conn exits at. */
871 int package_window
; /**< How many more relay cells can I send into the
873 int deliver_window
; /**< How many more relay cells can end at me? */
875 /** Nickname of planned exit node -- used with .exit support. */
876 char *chosen_exit_name
;
878 socks_request_t
*socks_request
; /**< SOCKS structure describing request (AP
880 struct circuit_t
*on_circuit
; /**< The circuit (if any) that this edge
881 * connection is using. */
883 uint32_t address_ttl
; /**< TTL for address-to-addr mapping on exit
884 * connection. Exit connections only. */
886 uint16_t stream_id
; /**< The stream ID used for this edge connection on its
889 /** The reason why this connection is closing; passed to the controller. */
892 /** Quasi-global identifier for this connection; used for control.c */
893 /* XXXX NM This can get re-used after 2**32 streams */
894 uint32_t global_identifier
;
896 /** Bytes read since last call to control_event_stream_bandwidth_used() */
899 /** Bytes written since last call to control_event_stream_bandwidth_used() */
902 char rend_query
[REND_SERVICE_ID_LEN
+1]; /**< What rendezvous service are we
903 * querying for? (AP only) */
905 /** Number of times we've reassigned this application connection to
906 * a new circuit. We keep track because the timeout is longer if we've
907 * already retried several times. */
908 uint8_t num_socks_retries
;
910 /** True iff this connection is for a dns request only. */
911 unsigned int is_dns_request
: 1;
913 /** If this is a DNSPort connection, this field holds the pending DNS
914 * request that we're going to try to answer. */
915 struct evdns_server_request
*dns_server_request
;
919 /** Subtype of connection_t for an "directory connection" -- that is, an HTTP
920 * connection to retrieve or serve directory material. */
921 typedef struct dir_connection_t
{
924 char *requested_resource
; /**< Which 'resource' did we ask the directory
926 unsigned int dirconn_direct
:1; /**< Is this dirconn direct, or via Tor? */
928 /* Used only for server sides of some dir connections, to implement
929 * "spooling" of directory material to the outbuf. Otherwise, we'd have
930 * to append everything to the outbuf in one enormous chunk. */
931 /** What exactly are we spooling right now? */
933 DIR_SPOOL_NONE
=0, DIR_SPOOL_SERVER_BY_DIGEST
, DIR_SPOOL_SERVER_BY_FP
,
934 DIR_SPOOL_EXTRA_BY_DIGEST
, DIR_SPOOL_EXTRA_BY_FP
,
935 DIR_SPOOL_CACHED_DIR
, DIR_SPOOL_NETWORKSTATUS
937 /** If we're fetching descriptors, what router purpose shall we assign
939 uint8_t router_purpose
;
940 /** List of fingerprints for networkstatuses or desriptors to be spooled. */
941 smartlist_t
*fingerprint_stack
;
942 /** A cached_dir_t object that we're currently spooling out */
943 struct cached_dir_t
*cached_dir
;
944 /** The current offset into cached_dir. */
945 off_t cached_dir_offset
;
946 /** The zlib object doing on-the-fly compression for spooled data. */
947 tor_zlib_state_t
*zlib_state
;
949 char rend_query
[REND_SERVICE_ID_LEN
+1]; /**< What rendezvous service are we
952 char identity_digest
[DIGEST_LEN
]; /**< Hash of the public RSA key for
953 * the directory server's signing key. */
957 /** Subtype of connection_t for an connection to a controller. */
958 typedef struct control_connection_t
{
961 uint32_t event_mask
; /**< Bitfield: which events does this controller
963 unsigned int use_long_names
:1; /**< True if we should use long nicknames
964 * on this (v1) connection. Only settable
965 * via v1 controllers. */
966 /** For control connections only. If set, we send extended info with control
967 * events as appropriate. */
968 unsigned int use_extended_events
:1;
970 /** True if we have sent a protocolinfo reply on this connection. */
971 unsigned int have_sent_protocolinfo
:1;
973 uint32_t incoming_cmd_len
;
974 uint32_t incoming_cmd_cur_len
;
976 /* Used only by control v0 connections */
977 uint16_t incoming_cmd_type
;
978 } control_connection_t
;
980 /** Cast a connection_t subtype pointer to a connection_t **/
981 #define TO_CONN(c) (&(((c)->_base)))
982 /** Helper macro: Given a pointer to to._base, of type from*, return &to. */
983 #define DOWNCAST(to, ptr) ((to*)SUBTYPE_P(ptr, to, _base))
985 /** Convert a connection_t* to an or_connection_t*; assert if the cast is
987 static or_connection_t
*TO_OR_CONN(connection_t
*);
988 /** Convert a connection_t* to a dir_connection_t*; assert if the cast is
990 static dir_connection_t
*TO_DIR_CONN(connection_t
*);
991 /** Convert a connection_t* to an edge_connection_t*; assert if the cast is
993 static edge_connection_t
*TO_EDGE_CONN(connection_t
*);
994 /** Convert a connection_t* to an control_connection_t*; assert if the cast is
996 static control_connection_t
*TO_CONTROL_CONN(connection_t
*);
998 static INLINE or_connection_t
*TO_OR_CONN(connection_t
*c
)
1000 tor_assert(c
->magic
== OR_CONNECTION_MAGIC
);
1001 return DOWNCAST(or_connection_t
, c
);
1003 static INLINE dir_connection_t
*TO_DIR_CONN(connection_t
*c
)
1005 tor_assert(c
->magic
== DIR_CONNECTION_MAGIC
);
1006 return DOWNCAST(dir_connection_t
, c
);
1008 static INLINE edge_connection_t
*TO_EDGE_CONN(connection_t
*c
)
1010 tor_assert(c
->magic
== EDGE_CONNECTION_MAGIC
);
1011 return DOWNCAST(edge_connection_t
, c
);
1013 static INLINE control_connection_t
*TO_CONTROL_CONN(connection_t
*c
)
1015 tor_assert(c
->magic
== CONTROL_CONNECTION_MAGIC
);
1016 return DOWNCAST(control_connection_t
, c
);
1020 ADDR_POLICY_ACCEPT
=1,
1021 ADDR_POLICY_REJECT
=2,
1022 } addr_policy_action_t
;
1024 /** A linked list of policy rules */
1025 typedef struct addr_policy_t
{
1026 addr_policy_action_t policy_type
; /**< What to do when the policy matches.*/
1027 char *string
; /**< String representation of this rule. */
1029 /* XXXX020 make this ipv6-capable */
1030 uint32_t addr
; /**< Base address to accept or reject. */
1031 maskbits_t maskbits
; /**< Accept/reject all addresses <b>a</b> such that the
1032 * first <b>maskbits</b> bits of <b>a</b> match
1034 uint16_t prt_min
; /**< Lowest port number to accept/reject. */
1035 uint16_t prt_max
; /**< Highest port number to accept/reject. */
1037 struct addr_policy_t
*next
; /**< Next rule in list. */
1040 /** A cached_dir_t represents a cacheable directory object, along with its
1041 * compressed form. */
1042 typedef struct cached_dir_t
{
1043 char *dir
; /**< Contents of this object */
1044 char *dir_z
; /**< Compressed contents of this object. */
1045 size_t dir_len
; /**< Length of <b>dir</b> */
1046 size_t dir_z_len
; /**< Length of <b>dir_z</b> */
1047 time_t published
; /**< When was this object published */
1048 int refcnt
; /**< Reference count for this cached_dir_t. */
1051 /** Enum used to remember where a signed_descriptor_t is stored and how to
1052 * manage the memory for signed_descriptor_body. */
1054 /** The descriptor isn't stored on disk at all: the copy in memory is
1055 * canonical; the saved_offset field is meaningless. */
1057 /** The descriptor is stored in the cached_routers file: the
1058 * signed_descriptor_body is meaningless; the signed_descriptor_len and
1059 * saved_offset are used to index into the mmaped cache file. */
1061 /** The descriptor is stored in the cached_routers.new file: the
1062 * signed_descriptor_body and saved_offset fields are both set. */
1063 /* FFFF (We could also mmap the file and grow the mmap as needed, or
1064 * lazy-load the descriptor text by using seek and read. We don't, for
1070 /** Information about our plans for retrying downloads for a downloadable
1072 typedef struct download_status_t
{
1073 time_t next_attempt_at
; /**< When should we try downloading this descriptor
1075 uint8_t n_download_failures
; /**< Number of failures trying to download the
1076 * most recent descriptor. */
1077 } download_status_t
;
1079 /** Information need to cache an onion router's descriptor. */
1080 typedef struct signed_descriptor_t
{
1081 /** Pointer to the raw server descriptor, preceeded by annotatinos. Not
1082 * necessarily NUL-terminated. If saved_location is SAVED_IN_CACHE, this
1083 * pointer is null. */
1084 char *signed_descriptor_body
;
1085 /** Length of the annotations preceeding the server descriptor. */
1086 size_t annotations_len
;
1087 /** Length of the server descriptor. */
1088 size_t signed_descriptor_len
;
1089 /** Digest of the server descriptor, computed as specified in dir-spec.txt */
1090 char signed_descriptor_digest
[DIGEST_LEN
];
1091 /** Identity digest of the router. */
1092 char identity_digest
[DIGEST_LEN
];
1093 /** Declared publication time of the descriptor */
1094 time_t published_on
;
1095 /** For routerdescs only: digest of the corresponding extrainfo. */
1096 char extra_info_digest
[DIGEST_LEN
];
1097 /** For routerdescs only: Status of downloading the corresponding
1099 download_status_t ei_dl_status
;
1100 /** Where is the descriptor saved? */
1101 saved_location_t saved_location
;
1102 /** If saved_location is SAVED_IN_CACHE or SAVED_IN_JOURNAL, the offset of
1103 * this descriptor in the corresponding file. */
1105 /** The valid-until time of the most recent consensus that listed this
1106 * descriptor. 0 for "never listed in a consensus, so far as we know." */
1107 time_t last_listed_as_valid_until
;
1108 /* If true, we do not ever try to save this object in the cache. */
1109 unsigned int do_not_cache
: 1;
1110 /* If true, this item is meant to represent an extrainfo. */
1111 unsigned int is_extrainfo
: 1;
1112 /* If true, we got an extrainfo for this item, and the digest was right,
1113 * but it was incompatible. */
1114 unsigned int extrainfo_is_bogus
: 1;
1115 } signed_descriptor_t
;
1117 /** Information about another onion router in the network. */
1119 signed_descriptor_t cache_info
;
1120 char *address
; /**< Location of OR: either a hostname or an IP address. */
1121 char *nickname
; /**< Human-readable OR name. */
1123 uint32_t addr
; /**< IPv4 address of OR, in host order. */
1124 uint16_t or_port
; /**< Port for TLS connections. */
1125 uint16_t dir_port
; /**< Port for HTTP directory connections. */
1127 crypto_pk_env_t
*onion_pkey
; /**< Public RSA key for onions. */
1128 crypto_pk_env_t
*identity_pkey
; /**< Public RSA key for signing. */
1130 char *platform
; /**< What software/operating system is this OR using? */
1133 uint32_t bandwidthrate
; /**< How many bytes does this OR add to its token
1134 * bucket per second? */
1135 uint32_t bandwidthburst
; /**< How large is this OR's token bucket? */
1136 /** How many bytes/s is this router known to handle? */
1137 uint32_t bandwidthcapacity
;
1138 addr_policy_t
*exit_policy
; /**< What streams will this OR permit
1140 long uptime
; /**< How many seconds the router claims to have been up */
1141 smartlist_t
*declared_family
; /**< Nicknames of router which this router
1142 * claims are its family. */
1143 char *contact_info
; /**< Declared contact info for this router. */
1144 unsigned int is_hibernating
:1; /**< Whether the router claims to be
1146 unsigned int has_old_dnsworkers
:1; /**< Whether the router is using
1147 * dnsworker code. */
1148 unsigned int caches_extra_info
:1; /**< Whether the router caches and serves
1149 * extrainfo documents. */
1152 unsigned int is_running
:1; /**< As far as we know, is this OR currently
1154 unsigned int is_valid
:1; /**< Has a trusted dirserver validated this OR?
1155 * (For Authdir: Have we validated this OR?)
1157 unsigned int is_named
:1; /**< Do we believe the nickname that this OR gives
1159 unsigned int is_fast
:1; /** Do we think this is a fast OR? */
1160 unsigned int is_stable
:1; /** Do we think this is a stable OR? */
1161 unsigned int is_possible_guard
:1; /**< Do we think this is an OK guard? */
1162 unsigned int is_exit
:1; /**< Do we think this is an OK exit? */
1163 unsigned int is_bad_exit
:1; /**< Do we think this exit is censored, borked,
1164 * or otherwise nasty? */
1166 /** Tor can use this router for general positions in circuits. */
1167 #define ROUTER_PURPOSE_GENERAL 0
1168 /** Tor should avoid using this router for circuit-building. */
1169 #define ROUTER_PURPOSE_CONTROLLER 1
1170 /** Tor should use this router only for bridge positions in circuits. */
1171 #define ROUTER_PURPOSE_BRIDGE 2
1172 /** Tor should not use this router; it was marked in cached-descriptors with
1173 * a purpose we didn't recognize. */
1174 #define ROUTER_PURPOSE_UNKNOWN 255
1176 uint8_t purpose
; /** What positions in a circuit is this router good for? */
1178 /* The below items are used only by authdirservers for
1179 * reachability testing. */
1180 /** When was the last time we could reach this OR? */
1181 time_t last_reachable
;
1182 /** When did we start testing reachability for this OR? */
1183 time_t testing_since
;
1184 /** How many times has a descriptor been posted and we believed
1185 * this router to be unreachable? We only actually warn on the third. */
1186 int num_unreachable_notifications
;
1188 /** What position is this descriptor within routerlist->routers? -1 for
1190 int routerlist_index
;
1193 /** Information needed to keep and cache a signed extra-info document. */
1194 typedef struct extrainfo_t
{
1195 signed_descriptor_t cache_info
;
1196 /** The router's nickname. */
1197 char nickname
[MAX_NICKNAME_LEN
+1];
1198 /** True iff we found the right key for this extra-info, verified the
1199 * signature, and found it to be bad. */
1200 unsigned int bad_sig
: 1;
1201 /** If present, we didn't have the right key to verify this extra-info,
1202 * so this is a copy of the signature in the document. */
1204 /** Length of pending_sig. */
1205 size_t pending_sig_len
;
1208 /** Contents of a single router entry in a network status object.
1210 typedef struct routerstatus_t
{
1211 time_t published_on
; /**< When was this router published? */
1212 char nickname
[MAX_NICKNAME_LEN
+1]; /**< The nickname this router says it
1214 char identity_digest
[DIGEST_LEN
]; /**< Digest of the router's identity
1216 char descriptor_digest
[DIGEST_LEN
]; /**< Digest of the router's most recent
1218 uint32_t addr
; /**< IPv4 address for this router. */
1219 uint16_t or_port
; /**< OR port for this router. */
1220 uint16_t dir_port
; /**< Directory port for this router. */
1221 unsigned int is_authority
:1; /**< True iff this router is an authority. */
1222 unsigned int is_exit
:1; /**< True iff this router is a good exit. */
1223 unsigned int is_stable
:1; /**< True iff this router stays up a long time. */
1224 unsigned int is_fast
:1; /**< True iff this router has good bandwidth. */
1225 unsigned int is_running
:1; /**< True iff this router is up. */
1226 unsigned int is_named
:1; /**< True iff "nickname" belongs to this router. */
1227 unsigned int is_unnamed
:1; /**< True iff "nickname" belongs to another
1229 unsigned int is_valid
:1; /**< True iff this router is validated. */
1230 unsigned int is_v2_dir
:1; /**< True iff this router can serve directory
1231 * information with v2 of the directory
1232 * protocol. (All directory caches cache v1
1234 unsigned int is_possible_guard
:1; /**< True iff this router would be a good
1235 * choice as an entry guard. */
1236 unsigned int is_bad_exit
:1; /**< True iff this node is a bad choice for
1238 unsigned int is_bad_directory
:1; /**< Do we think this directory is junky,
1239 * underpowered, or otherwise useless? */
1240 /** True iff we know version info for this router. (i.e., a "v" entry was
1241 * included.) We'll replace all these with a big tor_version_t or a char[]
1242 * if the number of traits we care about ever becomes incredibly big. */
1243 unsigned int version_known
:1;
1244 /** True iff this router is a version that supports BEGIN_DIR cells. */
1245 unsigned int version_supports_begindir
:1;
1246 /** True iff this router is a version that we can post extrainfo docs to. */
1247 unsigned int version_supports_extrainfo_upload
:1;
1248 /** True iff this router is a version that, if it caches directory info,
1249 * we can get v3 downloads from. */
1250 unsigned int version_supports_v3_dir
:1;
1252 /* ---- The fields below aren't derived from the networkstatus; they
1253 * hold local information only. */
1255 /** True if we, as a directory mirror, want to download the corresponding
1256 * routerinfo from the authority who gave us this routerstatus. (That is,
1257 * if we don't have the routerinfo, and if we haven't already tried to get it
1258 * from this authority.) Applies in v2 networkstatus document only.
1260 unsigned int need_to_mirror
:1;
1261 unsigned int name_lookup_warned
:1; /**< Have we warned the user for referring
1262 * to this (unnamed) router by nickname?
1264 time_t last_dir_503_at
; /**< When did this router last tell us that it
1265 * was too busy to serve directory info? */
1266 download_status_t dl_status
;
1270 /** How many times will we try to download a router's descriptor before giving
1272 #define MAX_ROUTERDESC_DOWNLOAD_FAILURES 8
1274 /** Contents of a v2 (non-consensus, non-vote) network status object. */
1275 typedef struct networkstatus_v2_t
{
1276 /** When did we receive the network-status document? */
1279 /** What was the digest of the document? */
1280 char networkstatus_digest
[DIGEST_LEN
];
1282 unsigned int is_recent
; /**< Is this recent enough to influence running
1285 /* These fields come from the actual network-status document.*/
1286 time_t published_on
; /**< Declared publication date. */
1288 char *source_address
; /**< Canonical directory server hostname. */
1289 uint32_t source_addr
; /**< Canonical directory server IP. */
1290 uint16_t source_dirport
; /**< Canonical directory server dirport. */
1292 unsigned int binds_names
:1; /**< True iff this directory server binds
1294 unsigned int recommends_versions
:1; /**< True iff this directory server
1295 * recommends client and server software
1297 unsigned int lists_bad_exits
:1; /**< True iff this directory server marks
1298 * malfunctioning exits as bad. */
1299 /** True iff this directory server marks malfunctioning directories as
1301 unsigned int lists_bad_directories
:1;
1303 char identity_digest
[DIGEST_LEN
]; /**< Digest of signing key. */
1304 char *contact
; /**< How to contact directory admin? (may be NULL). */
1305 crypto_pk_env_t
*signing_key
; /**< Key used to sign this directory. */
1306 char *client_versions
; /**< comma-separated list of recommended client
1308 char *server_versions
; /**< comma-separated list of recommended server
1311 smartlist_t
*entries
; /**< List of routerstatus_t*. This list is kept
1312 * sorted by identity_digest. */
1313 } networkstatus_v2_t
;
1315 /** The claim about a single router, make in a vote. */
1316 typedef struct vote_routerstatus_t
{
1317 routerstatus_t status
; /**< Underlying 'status' object for this router.
1318 * Flags are redundant. */
1319 uint64_t flags
; /**< Bit-field for all recognized flags; index into
1320 * networkstatus_vote_t.known_flags. */
1321 char *version
; /**< The version that the authority says this router is
1323 } vote_routerstatus_t
;
1325 /* Information about a single voter in a vote or a consensus. */
1326 typedef struct networkstatus_voter_info_t
{
1327 char *nickname
; /**< Nickname of this voter */
1328 char identity_digest
[DIGEST_LEN
]; /**< Digest of this voter's identity key */
1329 char *address
; /**< Address of this voter, in string format. */
1330 uint32_t addr
; /**< Address of this voter, in IPv4, in host order. */
1331 uint16_t dir_port
; /**< Directory port of this voter */
1332 uint16_t or_port
; /**< OR port of this voter */
1333 char *contact
; /**< Contact information for this voter. */
1334 char vote_digest
[DIGEST_LEN
]; /**< Digest of this voter's vote, as signed. */
1337 char signing_key_digest
[DIGEST_LEN
]; /* This part is _not_ signed. */
1340 unsigned int bad_signature
: 1;
1341 unsigned int good_signature
: 1;
1342 } networkstatus_voter_info_t
;
1344 /** A common structure to hold a v2 network status vote, or a v2 network
1345 * status consensus. */
1346 /* XXXX020 rename to networkstatus_t once it replaces networkstatus_t in
1348 typedef struct networkstatus_vote_t
{
1349 int is_vote
; /**< True if this is a vote; false if it is a consensus. */
1350 time_t published
; /**< Vote only: Tiem when vote was written. */
1351 time_t valid_after
; /**< Time after which this vote or consensus applies. */
1352 time_t fresh_until
; /**< Time before which this is the most recent vote or
1354 time_t valid_until
; /**< Time after which this vote or consensus should not
1357 /** Consensus only: what method was used to produce this consensus? */
1358 int consensus_method
;
1359 /** Vote only: what methods is this voter willing to use? */
1360 smartlist_t
*supported_methods
;
1362 /** How long does this vote/consensus claim that authorities take to
1363 * distribute their votes to one another? */
1365 /** How long does this vote/consensus claim that authorites take to
1366 * distribute their consensus signatures to one another? */
1369 /** Comma-separated list of recommended client software, or NULL if this
1370 * voter has no opinion. */
1371 char *client_versions
;
1372 char *server_versions
;
1373 /** List of flags that this vote/consensus applies to routers. If a flag is
1374 * not listed here, the voter has no opinion on what its value should be. */
1375 smartlist_t
*known_flags
;
1377 /** List of networkstatus_voter_info_t. For a vote, only one element
1378 * is included. For a consensus, one element is included for every voter
1379 * whose vote contributed to the consensus. */
1380 smartlist_t
*voters
;
1382 struct authority_cert_t
*cert
; /**< Vote only: the voter's certificate. */
1384 /** Digest of this document, as signed. */
1385 char networkstatus_digest
[DIGEST_LEN
];
1387 /** List of router statuses, sorted by identity digest. For a vote,
1388 * the elements are vote_routerstatus_t; for a consensus, the elements
1389 * are routerstatus_t. */
1390 smartlist_t
*routerstatus_list
;
1392 /** If present, a map from descriptor digest to elements of
1393 * routerstatus_list. */
1394 digestmap_t
*desc_digest_map
;
1395 } networkstatus_vote_t
;
1397 /** A set of signatures for a networkstatus consensus. All fields are as for
1398 * networkstatus_vote_t. */
1399 typedef struct ns_detached_signatures_t
{
1403 char networkstatus_digest
[DIGEST_LEN
];
1404 smartlist_t
*signatures
; /* list of networkstatus_voter_info_t */
1405 } ns_detached_signatures_t
;
1407 /** Allowable types of desc_store_t. */
1408 typedef enum store_type_t
{
1413 /** A 'store' is a set of descriptors saved on disk, with accompanying
1414 * journal, mmaped as needed, rebuilt as needed. */
1415 typedef struct desc_store_t
{
1416 /** Filename (within DataDir) for the store. We append .tmp to this
1417 * filename for a temporary file when rebuilding the store, and .new to this
1418 * filename for the journal. */
1419 const char *fname_base
;
1420 /** Alternative (obsolete) value for fname_base: if the file named by
1421 * fname_base isn't present, we read from here instead, but we never write
1423 const char *fname_alt_base
;
1424 /** Human-readable description of what this store contains. */
1425 const char *description
;
1427 tor_mmap_t
*mmap
; /**< A mmap for the main file in the store. */
1429 store_type_t type
; /**< What's stored in this store? */
1431 /** The size of the router log, in bytes. */
1433 /** The size of the router store, in bytes. */
1435 /** Total bytes dropped since last rebuild: this is space currently
1436 * used in the cache and the journal that could be freed by a rebuild. */
1437 size_t bytes_dropped
;
1440 /** Contents of a directory of onion routers. */
1442 /** Map from server identity digest to a member of routers. */
1443 struct digest_ri_map_t
*identity_map
;
1444 /** Map from server descriptor digest to a signed_descriptor_t from
1445 * routers or old_routers. */
1446 struct digest_sd_map_t
*desc_digest_map
;
1447 /** Map from extra-info digest to an extrainfo_t. Only exists for
1448 * routers in routers or old_routers. */
1449 struct digest_ei_map_t
*extra_info_map
;
1450 /** Map from extra-info digests to a signed_descriptor_t for a router
1451 * descriptor having that extra-info digest. Only exists for
1452 * routers in routers or old_routers. */
1453 struct digest_sd_map_t
*desc_by_eid_map
;
1454 /** List of routerinfo_t for all currently live routers we know. */
1455 smartlist_t
*routers
;
1456 /** List of signed_descriptor_t for older router descriptors we're
1458 smartlist_t
*old_routers
;
1459 /** Store holding server descriptors. If present, any router whose
1460 * cache_info.saved_location == SAVED_IN_CACHE is stored in this file
1461 * starting at cache_info.saved_offset */
1462 desc_store_t desc_store
;
1463 /** Store holding extra-info documents. */
1464 desc_store_t extrainfo_store
;
1467 /** Information on router used when extending a circuit. We don't need a
1468 * full routerinfo_t to extend: we only need addr:port:keyid to build an OR
1469 * connection, and onion_key to create the onionskin. Note that for onehop
1470 * general-purpose tunnels, the onion_key is NULL. */
1471 typedef struct extend_info_t
{
1472 char nickname
[MAX_HEX_NICKNAME_LEN
+1]; /**< This router's nickname for
1474 char identity_digest
[DIGEST_LEN
]; /**< Hash of this router's identity key. */
1475 uint16_t port
; /**< OR port. */
1476 uint32_t addr
; /**< IP address in host order. */
1477 crypto_pk_env_t
*onion_key
; /**< Current onionskin key. */
1480 /** Certificate for v3 directory protocol: binds long-term authority identity
1481 * keys to medium-term authority signing keys. */
1482 typedef struct authority_cert_t
{
1483 signed_descriptor_t cache_info
;
1484 crypto_pk_env_t
*identity_key
;
1485 crypto_pk_env_t
*signing_key
;
1486 char signing_key_digest
[DIGEST_LEN
];
1492 /** Bitfield enum type listing types of directory authority/directory
1496 V1_AUTHORITY
= 1 << 0,
1497 V2_AUTHORITY
= 1 << 1,
1498 V3_AUTHORITY
= 1 << 2,
1499 HIDSERV_AUTHORITY
= 1 << 3,
1500 BRIDGE_AUTHORITY
= 1 << 4,
1501 EXTRAINFO_CACHE
= 1 << 5, /* not precisely an authority type. */
1504 #define CRYPT_PATH_MAGIC 0x70127012u
1506 /** Holds accounting information for a single step in the layered encryption
1507 * performed by a circuit. Used only at the client edge of a circuit. */
1508 typedef struct crypt_path_t
{
1511 /* crypto environments */
1512 /** Encryption key and counter for cells heading towards the OR at this
1514 crypto_cipher_env_t
*f_crypto
;
1515 /** Encryption key and counter for cells heading back from the OR at this
1517 crypto_cipher_env_t
*b_crypto
;
1519 /** Digest state for cells heading towards the OR at this step. */
1520 crypto_digest_env_t
*f_digest
; /* for integrity checking */
1521 /** Digest state for cells heading away from the OR at this step. */
1522 crypto_digest_env_t
*b_digest
;
1524 /** Current state of Diffie-Hellman key negotiation with the OR at this
1526 crypto_dh_env_t
*dh_handshake_state
;
1527 /** Current state of 'fast' (non-PK) key negotiation with the OR at this
1528 * step. Used to save CPU when TLS is already providing all the
1529 * authentication, secrecy, and integrity we need, and we're already
1530 * distinguishable from an OR.
1532 char fast_handshake_state
[DIGEST_LEN
];
1533 /** Negotiated key material shared with the OR at this step. */
1534 char handshake_digest
[DIGEST_LEN
];/* KH in tor-spec.txt */
1536 /** Information to extend to the OR at this step. */
1537 extend_info_t
*extend_info
;
1539 /** Is the circuit built to this step? Must be one of:
1540 * - CPATH_STATE_CLOSED (The circuit has not been extended to this step)
1541 * - CPATH_STATE_AWAITING_KEYS (We have sent an EXTEND/CREATE to this step
1542 * and not received an EXTENDED/CREATED)
1543 * - CPATH_STATE_OPEN (The circuit has been extended to this step) */
1545 #define CPATH_STATE_CLOSED 0
1546 #define CPATH_STATE_AWAITING_KEYS 1
1547 #define CPATH_STATE_OPEN 2
1548 struct crypt_path_t
*next
; /**< Link to next crypt_path_t in the circuit.
1549 * (The list is circular, so the last node
1550 * links to the first.) */
1551 struct crypt_path_t
*prev
; /**< Link to previous crypt_path_t in the
1554 int package_window
; /**< How many bytes are we allowed to originate ending
1556 int deliver_window
; /**< How many bytes are we willing to deliver originating
1560 #define CPATH_KEY_MATERIAL_LEN (20*2+16*2)
1562 #define DH_KEY_LEN DH_BYTES
1563 #define ONIONSKIN_CHALLENGE_LEN (PKCS1_OAEP_PADDING_OVERHEAD+\
1566 #define ONIONSKIN_REPLY_LEN (DH_KEY_LEN+DIGEST_LEN)
1567 #define REND_COOKIE_LEN DIGEST_LEN
1569 /** Information used to build a circuit. */
1571 /** Intended length of the final circuit. */
1572 int desired_path_len
;
1573 /** How to extend to the planned exit node. */
1574 extend_info_t
*chosen_exit
;
1575 /** Whether every node in the circ must have adequate uptime. */
1577 /** Whether every node in the circ must have adequate capacity. */
1579 /** Whether the last hop was picked with exiting in mind. */
1581 /** Did we pick this as a one-hop tunnel (not safe for other conns)?
1582 * These are for encrypted connections that exit to this router, not
1583 * for arbitrary exits from the circuit. */
1585 /** The crypt_path_t to append after rendezvous: used for rendezvous. */
1586 crypt_path_t
*pending_final_cpath
;
1587 /** How many times has building a circuit for this task failed? */
1589 /** At what time should we give up on this task? */
1591 } cpath_build_state_t
;
1593 #define ORIGIN_CIRCUIT_MAGIC 0x35315243u
1594 #define OR_CIRCUIT_MAGIC 0x98ABC04Fu
1596 typedef uint16_t circid_t
;
1599 * A circuit is a path over the onion routing
1600 * network. Applications can connect to one end of the circuit, and can
1601 * create exit connections at the other end of the circuit. AP and exit
1602 * connections have only one circuit associated with them (and thus these
1603 * connection types are closed when the circuit is closed), whereas
1604 * OR connections multiplex many circuits at once, and stay standing even
1605 * when there are no circuits running over them.
1607 * A circuit_t structure can fill one of two roles. First, a or_circuit_t
1608 * links two connections together: either an edge connection and an OR
1609 * connection, or two OR connections. (When joined to an OR connection, a
1610 * circuit_t affects only cells sent to a particular circID on that
1611 * connection. When joined to an edge connection, a circuit_t affects all
1614 * Second, an origin_circuit_t holds the cipher keys and state for sending data
1615 * along a given circuit. At the OP, it has a sequence of ciphers, each
1616 * of which is shared with a single OR along the circuit. Separate
1617 * ciphers are used for data going "forward" (away from the OP) and
1618 * "backward" (towards the OP). At the OR, a circuit has only two stream
1619 * ciphers: one for data going forward, and one for data going backward.
1621 typedef struct circuit_t
{
1622 uint32_t magic
; /**< For memory and type debugging: must equal
1623 * ORIGIN_CIRCUIT_MAGIC or OR_CIRCUIT_MAGIC. */
1625 /** Queue of cells waiting to be transmitted on n_conn. */
1626 cell_queue_t n_conn_cells
;
1627 /** The OR connection that is next in this circuit. */
1628 or_connection_t
*n_conn
;
1629 /** The identity hash of n_conn. */
1630 char n_conn_id_digest
[DIGEST_LEN
];
1631 /** The circuit_id used in the next (forward) hop of this circuit. */
1633 /** The port for the OR that is next in this circuit. */
1635 /** The IPv4 address of the OR that is next in this circuit. */
1638 /** True iff we are waiting for n_conn_cells to become less full before
1639 * allowing p_streams to add any more cells. (Origin circuit only.) */
1640 unsigned int streams_blocked_on_n_conn
: 1;
1641 /** True iff we are waiting for p_conn_cells to become less full before
1642 * allowing n_streams to add any more cells. (OR circuit only.) */
1643 unsigned int streams_blocked_on_p_conn
: 1;
1645 uint8_t state
; /**< Current status of this circuit. */
1646 uint8_t purpose
; /**< Why are we creating this circuit? */
1648 /** How many relay data cells can we package (read from edge streams)
1649 * on this circuit before we receive a circuit-level sendme cell asking
1652 /** How many relay data cells will we deliver (write to edge streams)
1653 * on this circuit? When deliver_window gets low, we send some
1654 * circuit-level sendme cells to indicate that we're willing to accept
1658 /** For storage while passing to cpuworker (state
1659 * CIRCUIT_STATE_ONIONSKIN_PENDING), or while n_conn is pending
1660 * (state CIRCUIT_STATE_OR_WAIT). When defined, it is always
1661 * length ONIONSKIN_CHALLENGE_LEN. */
1664 time_t timestamp_created
; /**< When was this circuit created? */
1665 time_t timestamp_dirty
; /**< When the circuit was first used, or 0 if the
1666 * circuit is clean. */
1668 uint16_t marked_for_close
; /**< Should we close this circuit at the end of
1669 * the main loop? (If true, holds the line number
1670 * where this circuit was marked.) */
1671 const char *marked_for_close_file
; /**< For debugging: in which file was this
1672 * circuit marked for close? */
1674 /** Next circuit in the doubly-linked ring of circuits waiting to add
1675 * cells to n_conn. NULL if we have no cells pending, or if we're not
1676 * linked to an OR connection. */
1677 struct circuit_t
*next_active_on_n_conn
;
1678 /** Previous circuit in the doubly-linked ring of circuits waiting to add
1679 * cells to n_conn. NULL if we have no cells pending, or if we're not
1680 * linked to an OR connection. */
1681 struct circuit_t
*prev_active_on_n_conn
;
1682 struct circuit_t
*next
; /**< Next circuit in linked list of all circuits. */
1685 /** An origin_circuit_t holds data necessary to build and use a circuit.
1687 typedef struct origin_circuit_t
{
1690 /** Linked list of AP streams (or EXIT streams if hidden service)
1691 * associated with this circuit. */
1692 edge_connection_t
*p_streams
;
1693 /** Build state for this circuit. It includes the intended path
1694 * length, the chosen exit router, rendezvous information, etc.
1696 cpath_build_state_t
*build_state
;
1697 /** The doubly-linked list of crypt_path_t entries, one per hop,
1698 * for this circuit. This includes ciphers for each hop,
1699 * integrity-checking digests for each hop, and package/delivery
1700 * windows for each hop.
1702 crypt_path_t
*cpath
;
1704 /** The rend_pk_digest field holds a hash of location-hidden service's
1705 * PK if purpose is S_ESTABLISH_INTRO or S_RENDEZVOUSING.
1707 char rend_pk_digest
[DIGEST_LEN
];
1709 /** Holds rendezvous cookie if purpose is C_ESTABLISH_REND. Filled with
1712 char rend_cookie
[REND_COOKIE_LEN
];
1715 * The rend_query field holds the y portion of y.onion (nul-terminated)
1716 * if purpose is C_INTRODUCING or C_ESTABLISH_REND, or is a C_GENERAL
1717 * for a hidden service, or is S_*.
1719 char rend_query
[REND_SERVICE_ID_LEN
+1];
1721 /** The next stream_id that will be tried when we're attempting to
1722 * construct a new AP stream originating at this circuit. */
1723 uint16_t next_stream_id
;
1725 /** Quasi-global identifier for this circuit; used for control.c */
1726 /* XXXX NM This can get re-used after 2**32 circuits. */
1727 uint32_t global_identifier
;
1731 /** An or_circuit_t holds information needed to implement a circuit at an
1733 typedef struct or_circuit_t
{
1736 /** Next circuit in the doubly-linked ring of circuits waiting to add
1737 * cells to p_conn. NULL if we have no cells pending, or if we're not
1738 * linked to an OR connection. */
1739 struct circuit_t
*next_active_on_p_conn
;
1740 /** Previous circuit in the doubly-linked ring of circuits waiting to add
1741 * cells to p_conn. NULL if we have no cells pending, or if we're not
1742 * linked to an OR connection. */
1743 struct circuit_t
*prev_active_on_p_conn
;
1745 /** The circuit_id used in the previous (backward) hop of this circuit. */
1747 /** Queue of cells waiting to be transmitted on p_conn. */
1748 cell_queue_t p_conn_cells
;
1749 /** The OR connection that is previous in this circuit. */
1750 or_connection_t
*p_conn
;
1751 /** Linked list of Exit streams associated with this circuit. */
1752 edge_connection_t
*n_streams
;
1753 /** Linked list of Exit streams associated with this circuit that are
1754 * still being resolved. */
1755 edge_connection_t
*resolving_streams
;
1756 /** The cipher used by intermediate hops for cells heading toward the
1758 crypto_cipher_env_t
*p_crypto
;
1759 /** The cipher used by intermediate hops for cells heading away from
1761 crypto_cipher_env_t
*n_crypto
;
1763 /** The integrity-checking digest used by intermediate hops, for
1764 * cells packaged here and heading towards the OP.
1766 crypto_digest_env_t
*p_digest
;
1767 /** The integrity-checking digest used by intermediate hops, for
1768 * cells packaged at the OP and arriving here.
1770 crypto_digest_env_t
*n_digest
;
1772 /** Points to spliced circuit if purpose is REND_ESTABLISHED, and circuit
1773 * is not marked for close. */
1774 struct or_circuit_t
*rend_splice
;
1776 #if REND_COOKIE_LEN >= DIGEST_LEN
1777 #define REND_TOKEN_LEN REND_COOKIE_LEN
1779 #define REND_TOKEN_LEN DIGEST_LEN
1782 /** A hash of location-hidden service's PK if purpose is INTRO_POINT, or a
1783 * rendezvous cookie if purpose is REND_POINT_WAITING. Filled with zeroes
1785 * ???? move to a subtype or adjunct structure? Wastes 20 bytes. -NM
1787 char rend_token
[REND_TOKEN_LEN
];
1789 /* ???? move to a subtype or adjunct structure? Wastes 20 bytes -NM */
1790 char handshake_digest
[DIGEST_LEN
]; /**< Stores KH for the handshake. */
1792 /** True iff this circuit was made with a CREATE_FAST cell. */
1793 unsigned int is_first_hop
: 1;
1796 /** Convert a circuit subtype to a circuit_t.*/
1797 #define TO_CIRCUIT(x) (&((x)->_base))
1799 /** Convert a circuit_t* to a pointer to the enclosing or_circuit_t. Asserts
1800 * if the cast is impossible. */
1801 static or_circuit_t
*TO_OR_CIRCUIT(circuit_t
*);
1802 /** Convert a circuit_t* to a pointer to the enclosing origin_circuit_t.
1803 * Asserts if the cast is impossible. */
1804 static origin_circuit_t
*TO_ORIGIN_CIRCUIT(circuit_t
*);
1806 static INLINE or_circuit_t
*TO_OR_CIRCUIT(circuit_t
*x
)
1808 tor_assert(x
->magic
== OR_CIRCUIT_MAGIC
);
1809 return DOWNCAST(or_circuit_t
, x
);
1811 static INLINE origin_circuit_t
*TO_ORIGIN_CIRCUIT(circuit_t
*x
)
1813 tor_assert(x
->magic
== ORIGIN_CIRCUIT_MAGIC
);
1814 return DOWNCAST(origin_circuit_t
, x
);
1817 #define ALLOW_INVALID_ENTRY 1
1818 #define ALLOW_INVALID_EXIT 2
1819 #define ALLOW_INVALID_MIDDLE 4
1820 #define ALLOW_INVALID_RENDEZVOUS 8
1821 #define ALLOW_INVALID_INTRODUCTION 16
1823 /** An entry specifying a set of addresses and ports that should be remapped
1824 * to another address and port before exiting this exit node. */
1825 typedef struct exit_redirect_t
{
1826 /* XXXX020 make this whole mess ipv6-capable. (Does anybody use it? */
1831 maskbits_t maskbits
;
1835 unsigned is_redirect
:1;
1838 /* limits for TCP send and recv buffer size used for constrained sockets */
1839 #define MIN_CONSTRAINED_TCP_BUFFER 2048
1840 #define MAX_CONSTRAINED_TCP_BUFFER 262144 /* 256k */
1842 /** A linked list of lines in a config file. */
1843 typedef struct config_line_t
{
1846 struct config_line_t
*next
;
1849 /** Configuration options for a Tor process. */
1853 /** What should the tor process actually do? */
1855 CMD_RUN_TOR
=0, CMD_LIST_FINGERPRINT
, CMD_HASH_PASSWORD
,
1856 CMD_VERIFY_CONFIG
, CMD_RUN_UNITTESTS
1858 const char *command_arg
; /**< Argument for command-line option. */
1860 config_line_t
*Logs
; /**< New-style list of configuration lines
1863 char *DebugLogFile
; /**< Where to send verbose log messages. */
1864 char *DataDirectory
; /**< OR only: where to store long-term data. */
1865 char *Nickname
; /**< OR only: nickname of this onion router. */
1866 char *Address
; /**< OR only: configured address for this onion router. */
1867 char *PidFile
; /**< Where to store PID of Tor process. */
1869 char *ExitNodes
; /**< Comma-separated list of nicknames of ORs to consider
1871 char *EntryNodes
; /**< Comma-separated list of nicknames of ORs to consider
1872 * as entry points. */
1873 int StrictExitNodes
; /**< Boolean: When none of our ExitNodes are up, do we
1874 * stop building circuits? */
1875 int StrictEntryNodes
; /**< Boolean: When none of our EntryNodes are up, do we
1876 * stop building circuits? */
1877 char *ExcludeNodes
; /**< Comma-separated list of nicknames of ORs not to
1878 * use in circuits. */
1880 char *RendNodes
; /**< Comma-separated list of nicknames used as introduction
1882 char *RendExcludeNodes
; /**< Comma-separated list of nicknames not to use
1883 * as introduction points. */
1885 /** List of "entry", "middle", "exit", "introduction", "rendezvous". */
1886 smartlist_t
*AllowInvalidNodes
;
1887 int _AllowInvalid
; /**< Bitmask; derived from AllowInvalidNodes. */
1888 config_line_t
*ExitPolicy
; /**< Lists of exit policy components. */
1889 int ExitPolicyRejectPrivate
; /**< Should we not exit to local addresses? */
1890 config_line_t
*SocksPolicy
; /**< Lists of socks policy components */
1891 config_line_t
*DirPolicy
; /**< Lists of dir policy components */
1892 /** Addresses to bind for listening for SOCKS connections. */
1893 config_line_t
*SocksListenAddress
;
1894 /** Addresses to bind for listening for transparent pf/nefilter
1896 config_line_t
*TransListenAddress
;
1897 /** Addresses to bind for listening for transparent natd connections */
1898 config_line_t
*NatdListenAddress
;
1899 /** Addresses to bind for listening for SOCKS connections. */
1900 config_line_t
*DNSListenAddress
;
1901 /** Addresses to bind for listening for OR connections. */
1902 config_line_t
*ORListenAddress
;
1903 /** Addresses to bind for listening for directory connections. */
1904 config_line_t
*DirListenAddress
;
1905 /** Addresses to bind for listening for control connections. */
1906 config_line_t
*ControlListenAddress
;
1907 /** Local address to bind outbound sockets */
1908 char *OutboundBindAddress
;
1909 /** Directory server only: which versions of
1910 * Tor should we tell users to run? */
1911 config_line_t
*RecommendedVersions
;
1912 config_line_t
*RecommendedClientVersions
;
1913 config_line_t
*RecommendedServerVersions
;
1914 /** Whether dirservers refuse router descriptors with private IPs. */
1915 int DirAllowPrivateAddresses
;
1916 char *User
; /**< Name of user to run Tor as. */
1917 char *Group
; /**< Name of group to run Tor as. */
1918 int ORPort
; /**< Port to listen on for OR connections. */
1919 int SocksPort
; /**< Port to listen on for SOCKS connections. */
1920 /** Port to listen on for transparent pf/netfilter connections. */
1922 int NatdPort
; /**< Port to listen on for transparent natd connections. */
1923 int ControlPort
; /**< Port to listen on for control connections. */
1924 config_line_t
*ControlSocket
; /**< List of Unix Domain Sockets to listen on
1925 * for control connections. */
1926 int DirPort
; /**< Port to listen on for directory connections. */
1927 int DNSPort
; /**< Port to listen on for DNS requests. */
1928 int AssumeReachable
; /**< Whether to publish our descriptor regardless. */
1929 int AuthoritativeDir
; /**< Boolean: is this an authoritative directory? */
1930 int V1AuthoritativeDir
; /**< Boolean: is this an authoritative directory
1931 * for version 1 directories? */
1932 int V2AuthoritativeDir
; /**< Boolean: is this an authoritative directory
1933 * for version 2 directories? */
1934 int V3AuthoritativeDir
; /**< Boolean: is this an authoritative directory
1935 * for version 3 directories? */
1936 int HSAuthoritativeDir
; /**< Boolean: does this an authoritative directory
1937 * handle hidden service requests? */
1938 int HSAuthorityRecordStats
; /**< Boolean: does this HS authoritative
1939 * directory record statistics? */
1940 int NamingAuthoritativeDir
; /**< Boolean: is this an authoritative directory
1941 * that's willing to bind names? */
1942 int VersioningAuthoritativeDir
; /**< Boolean: is this an authoritative
1943 * directory that's willing to recommend
1945 int BridgeAuthoritativeDir
; /**< Boolean: is this an authoritative directory
1946 * that aggregates bridge descriptors? */
1948 int UseBridges
; /**< Boolean: should we start all circuits with a bridge? */
1949 config_line_t
*Bridges
; /**< List of bootstrap bridge addresses. */
1951 /** Boolean: if we know the bridge's digest, should we get new
1952 * descriptors from the bridge authorities or from the bridge itself? */
1953 int UpdateBridgesFromAuthority
;
1955 int AvoidDiskWrites
; /**< Boolean: should we never cache things to disk?
1957 int ClientOnly
; /**< Boolean: should we never evolve into a server role? */
1958 /** Boolean: should we never publish a descriptor? Deprecated. */
1960 /** To what authority types do we publish our descriptor? Choices are
1961 * "v1", "v2", "bridge", or "". */
1962 smartlist_t
*PublishServerDescriptor
;
1963 /** An authority type, derived from PublishServerDescriptor. */
1964 authority_type_t _PublishServerDescriptor
;
1965 /** Boolean: do we publish hidden service descriptors to the HS auths? */
1966 int PublishHidServDescriptors
;
1967 int FetchServerDescriptors
; /**< Do we fetch server descriptors as normal? */
1968 int FetchHidServDescriptors
; /** and hidden service descriptors? */
1969 int FetchUselessDescriptors
; /**< Do we fetch non-running descriptors too? */
1970 int AllDirActionsPrivate
; /**< Should every directory action be sent
1971 * through a Tor circuit? */
1973 int ConnLimit
; /**< Demanded minimum number of simultaneous connections. */
1974 int _ConnLimit
; /**< Maximum allowed number of simultaneous connections. */
1975 int RunAsDaemon
; /**< If true, run in the background. (Unix only) */
1976 int FascistFirewall
; /**< Whether to prefer ORs reachable on open ports. */
1977 smartlist_t
*FirewallPorts
; /**< Which ports our firewall allows
1979 config_line_t
*ReachableAddresses
; /**< IP:ports our firewall allows. */
1980 config_line_t
*ReachableORAddresses
; /**< IP:ports for OR conns. */
1981 config_line_t
*ReachableDirAddresses
; /**< IP:ports for Dir conns. */
1983 int ConstrainedSockets
; /**< Shrink xmit and recv socket buffers. */
1984 uint64_t ConstrainedSockSize
; /**< Size of constrained buffers. */
1986 /** Application ports that require all nodes in circ to have sufficient
1988 smartlist_t
*LongLivedPorts
;
1989 /** Should we try to reuse the same exit node for a given host */
1990 smartlist_t
*TrackHostExits
;
1991 int TrackHostExitsExpire
; /**< Number of seconds until we expire an
1993 config_line_t
*AddressMap
; /**< List of address map directives. */
1994 int AutomapHostsOnResolve
; /**< If true, when we get a resolve request for a
1995 * hostname ending with one of the suffixes in
1996 * <b>AutomapHostsSuffixes</b>, map it to a
1997 * virtual address. */
1998 smartlist_t
*AutomapHostsSuffixes
; /**< List of suffixes for
1999 * <b>AutomapHostsOnResolve</b>. */
2000 int RendPostPeriod
; /**< How often do we post each rendezvous service
2001 * descriptor? Remember to publish them independently. */
2002 int KeepalivePeriod
; /**< How often do we send padding cells to keep
2003 * connections alive? */
2004 int SocksTimeout
; /**< How long do we let a socks connection wait
2005 * unattached before we fail it? */
2006 int CircuitBuildTimeout
; /**< Cull non-open circuits that were born
2007 * at least this many seconds ago. */
2008 int CircuitIdleTimeout
; /**< Cull open clean circuits that were born
2009 * at least this many seconds ago. */
2010 int MaxOnionsPending
; /**< How many circuit CREATE requests do we allow
2011 * to wait simultaneously before we start dropping
2013 int NewCircuitPeriod
; /**< How long do we use a circuit before building
2015 int MaxCircuitDirtiness
; /**< Never use circs that were first used more than
2016 this interval ago. */
2017 uint64_t BandwidthRate
; /**< How much bandwidth, on average, are we willing
2018 * to use in a second? */
2019 uint64_t BandwidthBurst
; /**< How much bandwidth, at maximum, are we willing
2020 * to use in a second? */
2021 uint64_t MaxAdvertisedBandwidth
; /**< How much bandwidth are we willing to
2022 * tell people we have? */
2023 uint64_t RelayBandwidthRate
; /**< How much bandwidth, on average, are we
2024 * willing to use for all relayed conns? */
2025 uint64_t RelayBandwidthBurst
; /**< How much bandwidth, at maximum, will we
2026 * use in a second for all relayed conns? */
2027 int NumCpus
; /**< How many CPUs should we try to use? */
2028 int RunTesting
; /**< If true, create testing circuits to measure how well the
2029 * other ORs are running. */
2030 char *TestVia
; /**< When reachability testing, use these as middle hop. */
2031 config_line_t
*RendConfigLines
; /**< List of configuration lines
2032 * for rendezvous services. */
2033 char *ContactInfo
; /**< Contact info to be published in the directory */
2035 char *HttpProxy
; /**< hostname[:port] to use as http proxy, if any */
2036 uint32_t HttpProxyAddr
; /**< Parsed IPv4 addr for http proxy, if any */
2037 uint16_t HttpProxyPort
; /**< Parsed port for http proxy, if any */
2038 char *HttpProxyAuthenticator
; /**< username:password string, if any */
2040 char *HttpsProxy
; /**< hostname[:port] to use as https proxy, if any */
2041 uint32_t HttpsProxyAddr
; /**< Parsed IPv4 addr for https proxy, if any */
2042 uint16_t HttpsProxyPort
; /**< Parsed port for https proxy, if any */
2043 char *HttpsProxyAuthenticator
; /**< username:password string, if any */
2045 config_line_t
*DirServers
; /**< List of configuration lines
2046 * for directory servers. */
2047 char *MyFamily
; /**< Declared family for this OR. */
2048 config_line_t
*NodeFamilies
; /**< List of config lines for
2050 config_line_t
*RedirectExit
; /**< List of config lines for simple
2051 * addr/port redirection */
2052 smartlist_t
*RedirectExitList
; /**< List of exit_redirect_t */
2053 config_line_t
*AuthDirBadExit
; /**< Address policy for descriptors to
2054 * mark as bad exits. */
2055 config_line_t
*AuthDirReject
; /**< Address policy for descriptors to
2057 config_line_t
*AuthDirInvalid
; /**< Address policy for descriptors to
2058 * never mark as valid. */
2059 int AuthDirListBadExits
; /**< True iff we should list bad exits,
2060 * and vote for all other exits as good. */
2061 int AuthDirRejectUnlisted
; /**< Boolean: do we reject all routers that
2062 * aren't named in our fingerprint file? */
2063 char *AccountingStart
; /**< How long is the accounting interval, and when
2065 uint64_t AccountingMax
; /**< How many bytes do we allow per accounting
2066 * interval before hibernation? 0 for "never
2069 char *HashedControlPassword
; /**< Base64-encoded hash of a password for
2070 * the control system. */
2071 int CookieAuthentication
; /**< Boolean: do we enable cookie-based auth for
2072 * the control system? */
2073 char *CookieAuthFile
; /**< Location of a cookie authentication file. */
2074 int CookieAuthFileGroupReadable
; /**< Boolean: Is the CookieAuthFile g+r? */
2075 int LeaveStreamsUnattached
; /**< Boolean: Does Tor attach new streams to
2076 * circuits itself (0), or does it expect a controller
2078 int DisablePredictedCircuits
; /**< Boolean: does Tor preemptively
2079 * make circuits in the background (0),
2081 int ShutdownWaitLength
; /**< When we get a SIGINT and we're a server, how
2082 * long do we wait before exiting? */
2083 int SafeLogging
; /**< Boolean: are we allowed to log sensitive strings
2084 * such as addresses (0), or do we scrub them first (1)? */
2085 int SafeSocks
; /**< Boolean: should we outright refuse application
2086 * connections that use socks4 or socks5-with-local-dns? */
2087 #define LOG_PROTOCOL_WARN (get_options()->ProtocolWarnings ? \
2088 LOG_WARN : LOG_INFO)
2089 int ProtocolWarnings
; /**< Boolean: when other parties screw up the Tor
2090 * protocol, is it a warn or an info in our logs? */
2091 int TestSocks
; /**< Boolean: when we get a socks connection, do we loudly
2092 * log whether it was DNS-leaking or not? */
2093 int HardwareAccel
; /**< Boolean: Should we enable OpenSSL hardware
2094 * acceleration where available? */
2095 int UseEntryGuards
; /**< Boolean: Do we try to enter from a smallish number
2096 * of fixed nodes? */
2097 int NumEntryGuards
; /**< How many entry guards do we try to establish? */
2098 int RephistTrackTime
; /**< How many seconds do we keep rephist info? */
2099 int FastFirstHopPK
; /**< If Tor believes it is safe, should we save a third
2100 * of our PK time by sending CREATE_FAST cells? */
2102 addr_policy_t
*reachable_addr_policy
; /**< Parsed from ReachableAddresses */
2104 char *VirtualAddrNetwork
; /**< Address and mask to hand out for virtual
2105 * MAPADDRESS requests. */
2106 int ServerDNSSearchDomains
; /**< Boolean: If set, we don't force exit
2107 * addresses to be FQDNs, but rather search for them in
2108 * the local domains. */
2109 int ServerDNSDetectHijacking
; /**< Boolean: If true, check for DNS failure
2111 char *ServerDNSResolvConfFile
; /**< If provided, we configure our internal
2112 * resolver from the file here rather than from
2113 * /etc/resolv.conf (Unix) or the registry (Windows). */
2114 smartlist_t
*ServerDNSTestAddresses
; /**< A list of addresses that definitely
2115 * should be resolveable. Used for
2116 * testing our DNS server. */
2117 int EnforceDistinctSubnets
; /**< If true, don't allow multiple routers in the
2118 * same network zone in the same circuit. */
2119 int TunnelDirConns
; /**< If true, use BEGIN_DIR rather than BEGIN when
2121 int PreferTunneledDirConns
; /**< If true, avoid dirservers that don't
2122 * support BEGIN_DIR, when possible. */
2123 int AllowNonRFC953Hostnames
; /**< If true, we allow connections to hostnames
2124 * with weird characters. */
2125 /** If true, we try resolving hostnames with weird characters. */
2126 int ServerDNSAllowNonRFC953Hostnames
;
2128 /** If true, we try to download extra-info documents (and we serve them,
2129 * if we are a cache). For authorities, this is always true. */
2130 int DownloadExtraInfo
;
2132 /** If true, do not believe anybody who tells us that a domain resolves
2133 * to an internal address, or that an internal address has a PTR mapping.
2134 * Helps avoid some cross-site attacks. */
2135 int ClientDNSRejectInternalAddresses
;
2137 /** The length of time that we think a consensus should be fresh. */
2138 int V3AuthVotingInterval
;
2139 /** The length of time we think it will take to distribute votes */
2140 int V3AuthVoteDelay
;
2141 /** The length of time we think it will take to distribute signatures */
2142 int V3AuthDistDelay
;
2143 /** The number of intervals we think a consensus should be valid. */
2144 int V3AuthNIntervalsValid
;
2147 /** Persistent state for an onion router, as saved to disk. */
2150 /** The time at which we next plan to write the state to the disk. Equal to
2151 * TIME_MAX if there are no saveable changes, 0 if there are changes that
2152 * should be saved right away. */
2155 /** When was the state last written to disk? */
2158 /** Fields for accounting bandwidth use. */
2159 time_t AccountingIntervalStart
;
2160 uint64_t AccountingBytesReadInInterval
;
2161 uint64_t AccountingBytesWrittenInInterval
;
2162 int AccountingSecondsActive
;
2163 uint64_t AccountingExpectedUsage
;
2165 /** A list of Entry Guard-related configuration lines. */
2166 config_line_t
*EntryGuards
;
2168 /** These fields hold information on the history of bandwidth usage for
2169 * servers. The "Ends" fields hold the time when we last updated the
2170 * bandwidth usage. The "Interval" fields hold the granularity, in seconds,
2171 * of the entries of Values. The "Values" lists hold decimal string
2172 * representations of the number of bytes read or written in each
2174 time_t BWHistoryReadEnds
;
2175 int BWHistoryReadInterval
;
2176 smartlist_t
*BWHistoryReadValues
;
2177 time_t BWHistoryWriteEnds
;
2178 int BWHistoryWriteInterval
;
2179 smartlist_t
*BWHistoryWriteValues
;
2181 /** What version of Tor wrote this state file? */
2184 /** Holds any unrecognized values we found in the state file, in the order
2185 * in which we found them. */
2186 config_line_t
*ExtraLines
;
2188 /** When did we last rotate our onion key? "0" for 'no idea'. */
2189 time_t LastRotatedOnionKey
;
2192 /** Change the next_write time of <b>state</b> to <b>when</b>, unless the
2193 * state is already scheduled to be written to disk earlier than <b>when</b>.
2195 static INLINE
void or_state_mark_dirty(or_state_t
*state
, time_t when
)
2197 if (state
->next_write
> when
)
2198 state
->next_write
= when
;
2201 #define MAX_SOCKS_REPLY_LEN 1024
2202 #define MAX_SOCKS_ADDR_LEN 256
2204 /** Please open a TCP connection to this addr:port. */
2205 #define SOCKS_COMMAND_CONNECT 0x01
2206 /** Please turn this FQDN into an IP address, privately. */
2207 #define SOCKS_COMMAND_RESOLVE 0xF0
2208 /** Please turn this IP address into an FQDN, privately. */
2209 #define SOCKS_COMMAND_RESOLVE_PTR 0xF1
2211 /** Please open an encrypted direct TCP connection to the directory port
2212 * of the Tor server specified by address:port. (In this case address:port
2213 * specifies the ORPort of the server.) */
2214 #define SOCKS_COMMAND_CONNECT_DIR 0xF2
2216 #define SOCKS_COMMAND_IS_CONNECT(c) ((c)==SOCKS_COMMAND_CONNECT || \
2217 (c)==SOCKS_COMMAND_CONNECT_DIR)
2218 #define SOCKS_COMMAND_IS_RESOLVE(c) ((c)==SOCKS_COMMAND_RESOLVE || \
2219 (c)==SOCKS_COMMAND_RESOLVE_PTR)
2221 /** State of a SOCKS request from a user to an OP. Also used to encode other
2222 * information for non-socks user request (such as those on TransPort and
2224 struct socks_request_t
{
2225 /** Which version of SOCKS did the client use? One of "0, 4, 5" -- where
2226 * 0 means that no socks handshake ever took place, and this is just a
2227 * stub connection (e.g. see connection_ap_make_link()). */
2229 int command
; /**< What is this stream's goal? One from the above list. */
2230 size_t replylen
; /**< Length of <b>reply</b>. */
2231 char reply
[MAX_SOCKS_REPLY_LEN
]; /**< Write an entry into this string if
2232 * we want to specify our own socks reply,
2233 * rather than using the default socks4 or
2234 * socks5 socks reply. We use this for the
2235 * two-stage socks5 handshake.
2237 char address
[MAX_SOCKS_ADDR_LEN
]; /**< What address did the client ask to
2238 connect to/resolve? */
2239 uint16_t port
; /**< What port did the client ask to connect to? */
2240 unsigned has_finished
: 1; /**< Has the SOCKS handshake finished? Used to
2241 * make sure we send back a socks reply for
2242 * every connection. */
2245 /* all the function prototypes go here */
2247 /********************************* buffers.c ***************************/
2249 buf_t
*buf_new(void);
2250 buf_t
*buf_new_with_capacity(size_t size
);
2251 void buf_free(buf_t
*buf
);
2252 void buf_clear(buf_t
*buf
);
2253 void buf_shrink(buf_t
*buf
);
2254 void buf_shrink_freelists(int free_all
);
2255 void buf_dump_freelist_sizes(int severity
);
2257 size_t buf_datalen(const buf_t
*buf
);
2258 size_t buf_capacity(const buf_t
*buf
);
2259 const char *_buf_peek_raw_buffer(const buf_t
*buf
);
2261 int read_to_buf(int s
, size_t at_most
, buf_t
*buf
, int *reached_eof
);
2262 int read_to_buf_tls(tor_tls_t
*tls
, size_t at_most
, buf_t
*buf
);
2264 int flush_buf(int s
, buf_t
*buf
, size_t sz
, size_t *buf_flushlen
);
2265 int flush_buf_tls(tor_tls_t
*tls
, buf_t
*buf
, size_t sz
, size_t *buf_flushlen
);
2267 int write_to_buf(const char *string
, size_t string_len
, buf_t
*buf
);
2268 int write_to_buf_zlib(buf_t
*buf
, tor_zlib_state_t
*state
,
2269 const char *data
, size_t data_len
, int done
);
2270 int move_buf_to_buf(buf_t
*buf_out
, buf_t
*buf_in
, size_t *buf_flushlen
);
2271 int fetch_from_buf(char *string
, size_t string_len
, buf_t
*buf
);
2272 int fetch_from_buf_http(buf_t
*buf
,
2273 char **headers_out
, size_t max_headerlen
,
2274 char **body_out
, size_t *body_used
, size_t max_bodylen
,
2275 int force_complete
);
2276 int fetch_from_buf_socks(buf_t
*buf
, socks_request_t
*req
,
2277 int log_sockstype
, int safe_socks
);
2278 int fetch_from_buf_line(buf_t
*buf
, char *data_out
, size_t *data_len
);
2280 int peek_buf_has_control0_command(buf_t
*buf
);
2282 void assert_buf_ok(buf_t
*buf
);
2284 /********************************* circuitbuild.c **********************/
2286 char *circuit_list_path(origin_circuit_t
*circ
, int verbose
);
2287 char *circuit_list_path_for_controller(origin_circuit_t
*circ
);
2288 void circuit_log_path(int severity
, unsigned int domain
,
2289 origin_circuit_t
*circ
);
2290 void circuit_rep_hist_note_result(origin_circuit_t
*circ
);
2291 origin_circuit_t
*origin_circuit_init(uint8_t purpose
, int onehop_tunnel
,
2293 int need_capacity
, int internal
);
2294 origin_circuit_t
*circuit_establish_circuit(uint8_t purpose
,
2295 int onehop_tunnel
, extend_info_t
*exit
,
2296 int need_uptime
, int need_capacity
,
2298 int circuit_handle_first_hop(origin_circuit_t
*circ
);
2299 void circuit_n_conn_done(or_connection_t
*or_conn
, int status
);
2300 int inform_testing_reachability(void);
2301 int circuit_send_next_onion_skin(origin_circuit_t
*circ
);
2302 void circuit_note_clock_jumped(int seconds_elapsed
);
2303 int circuit_extend(cell_t
*cell
, circuit_t
*circ
);
2304 int circuit_init_cpath_crypto(crypt_path_t
*cpath
, const char *key_data
,
2306 int circuit_finish_handshake(origin_circuit_t
*circ
, uint8_t cell_type
,
2308 int circuit_truncated(origin_circuit_t
*circ
, crypt_path_t
*layer
);
2309 int onionskin_answer(or_circuit_t
*circ
, uint8_t cell_type
,
2310 const char *payload
, const char *keys
);
2311 int circuit_all_predicted_ports_handled(time_t now
, int *need_uptime
,
2312 int *need_capacity
);
2314 int circuit_append_new_exit(origin_circuit_t
*circ
, extend_info_t
*info
);
2315 int circuit_extend_to_new_exit(origin_circuit_t
*circ
, extend_info_t
*info
);
2316 void onion_append_to_cpath(crypt_path_t
**head_ptr
, crypt_path_t
*new_hop
);
2317 extend_info_t
*extend_info_alloc(const char *nickname
, const char *digest
,
2318 crypto_pk_env_t
*onion_key
,
2319 uint32_t addr
, uint16_t port
);
2320 extend_info_t
*extend_info_from_router(routerinfo_t
*r
);
2321 extend_info_t
*extend_info_dup(extend_info_t
*info
);
2322 void extend_info_free(extend_info_t
*info
);
2323 routerinfo_t
*build_state_get_exit_router(cpath_build_state_t
*state
);
2324 const char *build_state_get_exit_nickname(cpath_build_state_t
*state
);
2326 void entry_guards_compute_status(void);
2327 int entry_guard_register_connect_status(const char *digest
, int succeeded
,
2329 void entry_nodes_should_be_added(void);
2330 routerinfo_t
*choose_random_entry(cpath_build_state_t
*state
);
2331 int entry_guards_parse_state(or_state_t
*state
, int set
, char **msg
);
2332 void entry_guards_update_state(or_state_t
*state
);
2333 int getinfo_helper_entry_guards(control_connection_t
*conn
,
2334 const char *question
, char **answer
);
2336 void clear_bridge_list(void);
2337 int routerinfo_is_a_configured_bridge(routerinfo_t
*ri
);
2338 void bridge_add_from_config(uint32_t addr
, uint16_t port
, char *digest
);
2339 void fetch_bridge_descriptors(time_t now
);
2340 void learned_bridge_descriptor(routerinfo_t
*ri
);
2341 int any_bridge_descriptors_known(void);
2342 int bridges_should_be_retried(void);
2343 void bridges_retry_all(void);
2345 void entry_guards_free_all(void);
2347 /********************************* circuitlist.c ***********************/
2349 circuit_t
* _circuit_get_global_list(void);
2350 const char *circuit_state_to_string(int state
);
2351 void circuit_dump_by_conn(connection_t
*conn
, int severity
);
2352 void circuit_set_p_circid_orconn(or_circuit_t
*circ
, uint16_t id
,
2353 or_connection_t
*conn
);
2354 void circuit_set_n_circid_orconn(circuit_t
*circ
, uint16_t id
,
2355 or_connection_t
*conn
);
2356 void circuit_set_state(circuit_t
*circ
, int state
);
2357 void circuit_close_all_marked(void);
2358 origin_circuit_t
*origin_circuit_new(void);
2359 or_circuit_t
*or_circuit_new(uint16_t p_circ_id
, or_connection_t
*p_conn
);
2360 circuit_t
*circuit_get_by_circid_orconn(uint16_t circ_id
,
2361 or_connection_t
*conn
);
2362 circuit_t
*circuit_get_by_edge_conn(edge_connection_t
*conn
);
2363 void circuit_unlink_all_from_or_conn(or_connection_t
*conn
, int reason
);
2364 origin_circuit_t
*circuit_get_by_global_id(uint32_t id
);
2365 origin_circuit_t
*circuit_get_by_rend_query_and_purpose(const char *rend_query
,
2367 origin_circuit_t
*circuit_get_next_by_pk_and_purpose(origin_circuit_t
*start
,
2368 const char *digest
, uint8_t purpose
);
2369 or_circuit_t
*circuit_get_rendezvous(const char *cookie
);
2370 or_circuit_t
*circuit_get_intro_point(const char *digest
);
2371 origin_circuit_t
*circuit_find_to_cannibalize(uint8_t purpose
,
2372 extend_info_t
*info
,
2374 int need_capacity
, int internal
);
2375 void circuit_mark_all_unused_circs(void);
2376 void circuit_expire_all_dirty_circs(void);
2377 void _circuit_mark_for_close(circuit_t
*circ
, int reason
,
2378 int line
, const char *file
);
2379 int circuit_get_cpath_len(origin_circuit_t
*circ
);
2380 crypt_path_t
*circuit_get_cpath_hop(origin_circuit_t
*circ
, int hopnum
);
2381 void circuit_get_all_pending_on_or_conn(smartlist_t
*out
,
2382 or_connection_t
*or_conn
);
2383 int circuit_count_pending_on_or_conn(or_connection_t
*or_conn
);
2385 #define circuit_mark_for_close(c, reason) \
2386 _circuit_mark_for_close((c), (reason), __LINE__, _SHORT_FILE_)
2388 void assert_cpath_layer_ok(const crypt_path_t
*cp
);
2389 void assert_circuit_ok(const circuit_t
*c
);
2390 void circuit_free_all(void);
2392 /********************************* circuituse.c ************************/
2394 void circuit_expire_building(time_t now
);
2395 void circuit_remove_handled_ports(smartlist_t
*needed_ports
);
2396 int circuit_stream_is_being_handled(edge_connection_t
*conn
, uint16_t port
,
2398 void circuit_build_needed_circs(time_t now
);
2399 void circuit_detach_stream(circuit_t
*circ
, edge_connection_t
*conn
);
2401 void reset_bandwidth_test(void);
2402 int circuit_enough_testing_circs(void);
2404 void circuit_has_opened(origin_circuit_t
*circ
);
2405 void circuit_build_failed(origin_circuit_t
*circ
);
2406 origin_circuit_t
*circuit_launch_by_nickname(uint8_t purpose
,
2408 const char *exit_nickname
,
2409 int need_uptime
, int need_capacity
,
2411 origin_circuit_t
*circuit_launch_by_extend_info(uint8_t purpose
,
2413 extend_info_t
*info
,
2414 int need_uptime
, int need_capacity
,
2416 origin_circuit_t
*circuit_launch_by_router(uint8_t purpose
,
2419 int need_uptime
, int need_capacity
,
2421 void circuit_reset_failure_count(int timeout
);
2422 int connection_ap_handshake_attach_chosen_circuit(edge_connection_t
*conn
,
2423 origin_circuit_t
*circ
,
2424 crypt_path_t
*cpath
);
2425 int connection_ap_handshake_attach_circuit(edge_connection_t
*conn
);
2427 /********************************* command.c ***************************/
2429 void command_process_cell(cell_t
*cell
, or_connection_t
*conn
);
2431 extern uint64_t stats_n_padding_cells_processed
;
2432 extern uint64_t stats_n_create_cells_processed
;
2433 extern uint64_t stats_n_created_cells_processed
;
2434 extern uint64_t stats_n_relay_cells_processed
;
2435 extern uint64_t stats_n_destroy_cells_processed
;
2437 /********************************* config.c ***************************/
2439 or_options_t
*get_options(void);
2440 int set_options(or_options_t
*new_val
, char **msg
);
2441 void config_free_all(void);
2442 const char *safe_str(const char *address
);
2443 const char *escaped_safe_str(const char *address
);
2444 const char *get_version(void);
2446 int config_get_lines(char *string
, config_line_t
**result
);
2447 void config_free_lines(config_line_t
*front
);
2448 int options_trial_assign(config_line_t
*list
, int use_defaults
,
2449 int clear_first
, char **msg
);
2450 int resolve_my_address(int warn_severity
, or_options_t
*options
,
2451 uint32_t *addr
, char **hostname_out
);
2452 int is_local_IP(uint32_t ip
) ATTR_PURE
;
2453 void options_init(or_options_t
*options
);
2454 int options_init_from_torrc(int argc
, char **argv
);
2455 int option_is_recognized(const char *key
);
2456 const char *option_get_canonical_name(const char *key
);
2457 config_line_t
*option_get_assignment(or_options_t
*options
,
2459 int options_save_current(void);
2460 const char *get_torrc_fname(void);
2461 char *get_datadir_fname2_suffix(const char *sub1
, const char *sub2
,
2462 const char *suffix
);
2464 #define get_datadir_fname(sub1) get_datadir_fname2_suffix((sub1), NULL, NULL)
2465 #define get_datadir_fname2(sub1,sub2) \
2466 get_datadir_fname2_suffix((sub1), (sub2), NULL)
2467 #define get_datadir_fname_suffix(sub1, suffix) \
2468 get_datadir_fname2_suffix((sub1), NULL, (suffix))
2470 or_state_t
*get_or_state(void);
2471 int or_state_save(time_t now
);
2473 int getinfo_helper_config(control_connection_t
*conn
,
2474 const char *question
, char **answer
);
2476 #ifdef CONFIG_PRIVATE
2477 /* Used only by config.c and test.c */
2478 or_options_t
*options_new(void);
2481 /********************************* connection.c ***************************/
2483 const char *conn_type_to_string(int type
);
2484 const char *conn_state_to_string(int type
, int state
);
2486 connection_t
*connection_new(int type
, int socket_family
);
2487 void connection_link_connections(connection_t
*conn_a
, connection_t
*conn_b
);
2488 void connection_unregister_events(connection_t
*conn
);
2489 void connection_free(connection_t
*conn
);
2490 void connection_free_all(void);
2491 void connection_about_to_close_connection(connection_t
*conn
);
2492 void connection_close_immediate(connection_t
*conn
);
2493 void _connection_mark_for_close(connection_t
*conn
,int line
, const char *file
);
2495 #define connection_mark_for_close(c) \
2496 _connection_mark_for_close((c), __LINE__, _SHORT_FILE_)
2498 void connection_expire_held_open(void);
2500 int connection_connect(connection_t
*conn
, const char *address
, uint32_t addr
,
2502 int retry_all_listeners(smartlist_t
*replaced_conns
,
2503 smartlist_t
*new_conns
);
2505 int connection_bucket_write_limit(connection_t
*conn
, time_t now
);
2506 int global_write_bucket_low(connection_t
*conn
, size_t attempt
, int priority
);
2507 void connection_bucket_init(void);
2508 void connection_bucket_refill(int seconds_elapsed
, time_t now
);
2510 int connection_handle_read(connection_t
*conn
);
2512 int connection_fetch_from_buf(char *string
, size_t len
, connection_t
*conn
);
2514 int connection_wants_to_flush(connection_t
*conn
);
2515 int connection_outbuf_too_full(connection_t
*conn
);
2516 int connection_handle_write(connection_t
*conn
, int force
);
2517 void _connection_write_to_buf_impl(const char *string
, size_t len
,
2518 connection_t
*conn
, int zlib
);
2519 static void connection_write_to_buf(const char *string
, size_t len
,
2520 connection_t
*conn
);
2521 static void connection_write_to_buf_zlib(const char *string
, size_t len
,
2522 dir_connection_t
*conn
, int done
);
2524 connection_write_to_buf(const char *string
, size_t len
, connection_t
*conn
)
2526 _connection_write_to_buf_impl(string
, len
, conn
, 0);
2529 connection_write_to_buf_zlib(const char *string
, size_t len
,
2530 dir_connection_t
*conn
, int done
)
2532 _connection_write_to_buf_impl(string
, len
, TO_CONN(conn
), done
? -1 : 1);
2535 or_connection_t
*connection_or_exact_get_by_addr_port(uint32_t addr
,
2537 edge_connection_t
*connection_get_by_global_id(uint32_t id
);
2539 connection_t
*connection_get_by_type(int type
);
2540 connection_t
*connection_get_by_type_purpose(int type
, int purpose
);
2541 connection_t
*connection_get_by_type_addr_port_purpose(int type
, uint32_t addr
,
2542 uint16_t port
, int purpose
);
2543 connection_t
*connection_get_by_type_state(int type
, int state
);
2545 connection_t
*connection_get_by_type_state_lastwritten(int type
, int state
);
2547 connection_t
*connection_get_by_type_state_rendquery(int type
, int state
,
2548 const char *rendquery
);
2550 #define connection_speaks_cells(conn) ((conn)->type == CONN_TYPE_OR)
2551 int connection_is_listener(connection_t
*conn
);
2552 int connection_state_is_open(connection_t
*conn
);
2553 int connection_state_is_connecting(connection_t
*conn
);
2555 char *alloc_http_authenticator(const char *authenticator
);
2557 void assert_connection_ok(connection_t
*conn
, time_t now
);
2558 int connection_or_nonopen_was_started_here(or_connection_t
*conn
);
2559 void connection_dump_buffer_mem_stats(int severity
);
2560 void remove_file_if_very_old(const char *fname
, time_t now
);
2562 /********************************* connection_edge.c *************************/
2564 #define connection_mark_unattached_ap(conn, endreason) \
2565 _connection_mark_unattached_ap((conn), (endreason), __LINE__, _SHORT_FILE_)
2567 void _connection_mark_unattached_ap(edge_connection_t
*conn
, int endreason
,
2568 int line
, const char *file
);
2569 int connection_edge_reached_eof(edge_connection_t
*conn
);
2570 int connection_edge_process_inbuf(edge_connection_t
*conn
,
2571 int package_partial
);
2572 int connection_edge_destroy(uint16_t circ_id
, edge_connection_t
*conn
);
2573 int connection_edge_end(edge_connection_t
*conn
, char reason
);
2574 int connection_edge_end_errno(edge_connection_t
*conn
);
2575 int connection_edge_finished_flushing(edge_connection_t
*conn
);
2576 int connection_edge_finished_connecting(edge_connection_t
*conn
);
2578 int connection_ap_handshake_send_begin(edge_connection_t
*ap_conn
);
2579 int connection_ap_handshake_send_resolve(edge_connection_t
*ap_conn
);
2581 edge_connection_t
*connection_ap_make_link(char *address
, uint16_t port
,
2582 const char *digest
, int command
);
2583 void connection_ap_handshake_socks_reply(edge_connection_t
*conn
, char *reply
,
2586 void connection_ap_handshake_socks_resolved(edge_connection_t
*conn
,
2593 int connection_exit_begin_conn(cell_t
*cell
, circuit_t
*circ
);
2594 int connection_exit_begin_resolve(cell_t
*cell
, or_circuit_t
*circ
);
2595 void connection_exit_connect(edge_connection_t
*conn
);
2596 int connection_edge_is_rendezvous_stream(edge_connection_t
*conn
);
2597 int connection_ap_can_use_exit(edge_connection_t
*conn
, routerinfo_t
*exit
);
2598 void connection_ap_expire_beginning(void);
2599 void connection_ap_attach_pending(void);
2600 void circuit_discard_optional_exit_enclaves(extend_info_t
*info
);
2601 int connection_ap_detach_retriable(edge_connection_t
*conn
,
2602 origin_circuit_t
*circ
,
2604 int connection_ap_process_transparent(edge_connection_t
*conn
);
2606 int address_is_invalid_destination(const char *address
, int client
);
2608 void addressmap_init(void);
2609 void addressmap_clean(time_t now
);
2610 void addressmap_clear_configured(void);
2611 void addressmap_clear_transient(void);
2612 void addressmap_free_all(void);
2613 int addressmap_rewrite(char *address
, size_t maxlen
, time_t *expires_out
);
2614 int addressmap_have_mapping(const char *address
);
2615 void addressmap_register(const char *address
, char *new_address
,
2617 int parse_virtual_addr_network(const char *val
, int validate_only
,
2619 int client_dns_incr_failures(const char *address
);
2620 void client_dns_clear_failures(const char *address
);
2621 void client_dns_set_addressmap(const char *address
, uint32_t val
,
2622 const char *exitname
, int ttl
);
2623 const char *addressmap_register_virtual_address(int type
, char *new_address
);
2624 void addressmap_get_mappings(smartlist_t
*sl
, time_t min_expires
,
2625 time_t max_expires
, int want_expiry
);
2626 int connection_ap_handshake_rewrite_and_attach(edge_connection_t
*conn
,
2627 origin_circuit_t
*circ
,
2628 crypt_path_t
*cpath
);
2629 int hostname_is_noconnect_address(const char *address
);
2631 void set_exit_redirects(smartlist_t
*lst
);
2632 typedef enum hostname_type_t
{
2633 NORMAL_HOSTNAME
, ONION_HOSTNAME
, EXIT_HOSTNAME
, BAD_HOSTNAME
2635 hostname_type_t
parse_extended_hostname(char *address
);
2637 /********************************* connection_or.c ***************************/
2639 void connection_or_remove_from_identity_map(or_connection_t
*conn
);
2640 void connection_or_clear_identity_map(void);
2641 or_connection_t
*connection_or_get_by_identity_digest(const char *digest
);
2643 int connection_or_reached_eof(or_connection_t
*conn
);
2644 int connection_or_process_inbuf(or_connection_t
*conn
);
2645 int connection_or_flushed_some(or_connection_t
*conn
);
2646 int connection_or_finished_flushing(or_connection_t
*conn
);
2647 int connection_or_finished_connecting(or_connection_t
*conn
);
2649 or_connection_t
*connection_or_connect(uint32_t addr
, uint16_t port
,
2650 const char *id_digest
);
2652 int connection_tls_start_handshake(or_connection_t
*conn
, int receiving
);
2653 int connection_tls_continue_handshake(or_connection_t
*conn
);
2655 void connection_or_write_cell_to_buf(const cell_t
*cell
,
2656 or_connection_t
*conn
);
2657 int connection_or_send_destroy(uint16_t circ_id
, or_connection_t
*conn
,
2660 void cell_pack(packed_cell_t
*dest
, const cell_t
*src
);
2662 /********************************* control.c ***************************/
2664 typedef enum circuit_status_event_t
{
2665 CIRC_EVENT_LAUNCHED
= 0,
2666 CIRC_EVENT_BUILT
= 1,
2667 CIRC_EVENT_EXTENDED
= 2,
2668 CIRC_EVENT_FAILED
= 3,
2669 CIRC_EVENT_CLOSED
= 4,
2670 } circuit_status_event_t
;
2672 typedef enum stream_status_event_t
{
2673 STREAM_EVENT_SENT_CONNECT
= 0,
2674 STREAM_EVENT_SENT_RESOLVE
= 1,
2675 STREAM_EVENT_SUCCEEDED
= 2,
2676 STREAM_EVENT_FAILED
= 3,
2677 STREAM_EVENT_CLOSED
= 4,
2678 STREAM_EVENT_NEW
= 5,
2679 STREAM_EVENT_NEW_RESOLVE
= 6,
2680 STREAM_EVENT_FAILED_RETRIABLE
= 7,
2681 STREAM_EVENT_REMAP
= 8
2682 } stream_status_event_t
;
2684 typedef enum or_conn_status_event_t
{
2685 OR_CONN_EVENT_LAUNCHED
= 0,
2686 OR_CONN_EVENT_CONNECTED
= 1,
2687 OR_CONN_EVENT_FAILED
= 2,
2688 OR_CONN_EVENT_CLOSED
= 3,
2689 OR_CONN_EVENT_NEW
= 4,
2690 } or_conn_status_event_t
;
2692 void control_update_global_event_mask(void);
2693 void control_adjust_event_log_severity(void);
2695 /** Execute the statement <b>stmt</b>, which may log events concerning the
2696 * connection <b>conn</b>. To prevent infinite loops, disable log messages
2697 * being sent to controllers if <b>conn</b> is a control connection.
2699 * Stmt must not contain any return or goto statements.
2701 #define CONN_LOG_PROTECT(conn, stmt) \
2703 int _log_conn_is_control = (conn && conn->type == CONN_TYPE_CONTROL); \
2704 if (_log_conn_is_control) \
2705 disable_control_logging(); \
2706 STMT_BEGIN stmt; STMT_END; \
2707 if (_log_conn_is_control) \
2708 enable_control_logging(); \
2711 /** Log information about the connection <b>conn</b>, protecting it as with
2712 * CONN_LOG_PROTECT. Example:
2714 * LOG_FN_CONN(conn, (LOG_DEBUG, "Socket %d wants to write", conn->s));
2716 #define LOG_FN_CONN(conn, args) \
2717 CONN_LOG_PROTECT(conn, log_fn args)
2719 int connection_control_finished_flushing(control_connection_t
*conn
);
2720 int connection_control_reached_eof(control_connection_t
*conn
);
2721 int connection_control_process_inbuf(control_connection_t
*conn
);
2723 #define EVENT_AUTHDIR_NEWDESCS 0x000D
2724 int control_event_is_interesting(int event
);
2726 int control_event_circuit_status(origin_circuit_t
*circ
,
2727 circuit_status_event_t e
, int reason
);
2728 int control_event_stream_status(edge_connection_t
*conn
,
2729 stream_status_event_t e
,
2731 int control_tls_error_to_reason(int e
);
2732 int control_event_or_conn_status(or_connection_t
*conn
,
2733 or_conn_status_event_t e
, int reason
);
2734 int control_event_bandwidth_used(uint32_t n_read
, uint32_t n_written
);
2735 int control_event_stream_bandwidth_used(void);
2736 void control_event_logmsg(int severity
, unsigned int domain
, const char *msg
);
2737 int control_event_descriptors_changed(smartlist_t
*routers
);
2738 int control_event_address_mapped(const char *from
, const char *to
,
2739 time_t expires
, const char *error
);
2740 int control_event_or_authdir_new_descriptor(const char *action
,
2744 int control_event_my_descriptor_changed(void);
2745 int control_event_networkstatus_changed(smartlist_t
*statuses
);
2746 int control_event_networkstatus_changed_single(routerstatus_t
*rs
);
2747 int control_event_general_status(int severity
, const char *format
, ...)
2749 int control_event_client_status(int severity
, const char *format
, ...)
2751 int control_event_server_status(int severity
, const char *format
, ...)
2753 int control_event_guard(const char *nickname
, const char *digest
,
2754 const char *status
);
2756 int init_cookie_authentication(int enabled
);
2757 int decode_hashed_password(char *buf
, const char *hashed
);
2758 void disable_control_logging(void);
2759 void enable_control_logging(void);
2761 #ifdef CONTROL_PRIVATE
2762 /* Used only by control.c and test.c */
2763 size_t write_escaped_data(const char *data
, size_t len
, char **out
);
2764 size_t read_escaped_data(const char *data
, size_t len
, char **out
);
2767 /********************************* cpuworker.c *****************************/
2769 void cpu_init(void);
2770 void cpuworkers_rotate(void);
2771 int connection_cpu_finished_flushing(connection_t
*conn
);
2772 int connection_cpu_reached_eof(connection_t
*conn
);
2773 int connection_cpu_process_inbuf(connection_t
*conn
);
2774 int assign_to_cpuworker(connection_t
*cpuworker
, uint8_t question_type
,
2777 /********************************* directory.c ***************************/
2779 int directories_have_accepted_server_descriptor(void);
2780 char *authority_type_to_string(authority_type_t auth
);
2781 void directory_post_to_dirservers(uint8_t dir_purpose
, uint8_t router_purpose
,
2782 authority_type_t type
, const char *payload
,
2783 size_t payload_len
, size_t extrainfo_len
);
2784 void directory_get_from_dirserver(uint8_t dir_purpose
, uint8_t router_purpose
,
2785 const char *resource
,
2786 int retry_if_no_servers
);
2787 void directory_get_from_all_authorities(uint8_t dir_purpose
,
2788 uint8_t router_purpose
,
2789 const char *resource
);
2790 void directory_initiate_command_routerstatus(routerstatus_t
*status
,
2791 uint8_t dir_purpose
,
2792 uint8_t router_purpose
,
2793 int anonymized_connection
,
2794 const char *resource
,
2795 const char *payload
,
2796 size_t payload_len
);
2798 int parse_http_response(const char *headers
, int *code
, time_t *date
,
2799 compress_method_t
*compression
, char **response
);
2801 int connection_dir_reached_eof(dir_connection_t
*conn
);
2802 int connection_dir_process_inbuf(dir_connection_t
*conn
);
2803 int connection_dir_finished_flushing(dir_connection_t
*conn
);
2804 int connection_dir_finished_connecting(dir_connection_t
*conn
);
2805 void connection_dir_request_failed(dir_connection_t
*conn
);
2806 void directory_initiate_command(const char *address
, uint32_t addr
,
2807 uint16_t or_port
, uint16_t dir_port
,
2808 int supports_begindir
, const char *digest
,
2809 uint8_t dir_purpose
, uint8_t router_purpose
,
2810 int anonymized_connection
,
2811 const char *resource
,
2812 const char *payload
, size_t payload_len
);
2814 int dir_split_resource_into_fingerprints(const char *resource
,
2815 smartlist_t
*fp_out
, int *compresseed_out
,
2816 int decode_hex
, int sort_uniq
);
2817 char *directory_dump_request_log(void);
2818 int router_supports_extrainfo(const char *identity_digest
, int is_authority
);
2820 time_t download_status_increment_failure(download_status_t
*dls
,
2821 int status_code
, const char *item
,
2822 int server
, time_t now
);
2823 #define download_status_failed(dls, sc) \
2824 download_status_increment_failure((dls), (sc), NULL, \
2825 get_options()->DirPort, time(NULL))
2827 void download_status_reset(download_status_t
*dls
);
2829 static int download_status_is_ready(download_status_t
*dls
, time_t now
,
2832 download_status_is_ready(download_status_t
*dls
, time_t now
,
2835 return (dls
->n_download_failures
<= max_failures
2836 && dls
->next_attempt_at
<= now
);
2839 /********************************* dirserv.c ***************************/
2841 #define UNNAMED_ROUTER_NICKNAME "Unnamed"
2843 int connection_dirserv_flushed_some(dir_connection_t
*conn
);
2845 int dirserv_add_own_fingerprint(const char *nickname
, crypto_pk_env_t
*pk
);
2846 int dirserv_load_fingerprint_file(void);
2847 void dirserv_free_fingerprint_list(void);
2848 const char *dirserv_get_nickname_by_digest(const char *digest
);
2849 int dirserv_add_multiple_descriptors(const char *desc
, uint8_t purpose
,
2852 int dirserv_add_descriptor(routerinfo_t
*ri
, const char **msg
);
2853 int getinfo_helper_dirserv_unregistered(control_connection_t
*conn
,
2854 const char *question
, char **answer
);
2855 void dirserv_free_descriptors(void);
2856 int dirserv_thinks_router_is_blatantly_unreachable(routerinfo_t
*router
,
2858 int list_server_status(smartlist_t
*routers
, char **router_status_out
,
2859 int for_controller
);
2860 int dirserv_dump_directory_to_string(char **dir_out
,
2861 crypto_pk_env_t
*private_key
);
2862 void directory_set_dirty(void);
2863 cached_dir_t
*dirserv_get_directory(void);
2864 cached_dir_t
*dirserv_get_runningrouters(void);
2865 cached_dir_t
*dirserv_get_consensus(void);
2866 void dirserv_set_cached_directory(const char *directory
, time_t when
,
2867 int is_running_routers
);
2868 void dirserv_set_cached_networkstatus_v2(const char *directory
,
2869 const char *identity
,
2871 void dirserv_set_cached_networkstatus_v3(const char *consensus
,
2873 void dirserv_clear_old_networkstatuses(time_t cutoff
);
2874 void dirserv_clear_old_v1_info(time_t now
);
2875 void dirserv_get_networkstatus_v2(smartlist_t
*result
, const char *key
);
2876 void dirserv_get_networkstatus_v2_fingerprints(smartlist_t
*result
,
2878 int dirserv_get_routerdesc_fingerprints(smartlist_t
*fps_out
, const char *key
,
2880 int dirserv_get_routerdescs(smartlist_t
*descs_out
, const char *key
,
2882 void dirserv_orconn_tls_done(const char *address
,
2884 const char *digest_rcvd
,
2886 void dirserv_test_reachability(time_t now
, int try_all
);
2887 int authdir_wants_to_reject_router(routerinfo_t
*ri
, const char **msg
,
2889 int dirserv_would_reject_router(routerstatus_t
*rs
);
2890 int dirserv_remove_old_statuses(smartlist_t
*fps
, time_t cutoff
);
2891 int dirserv_have_any_serverdesc(smartlist_t
*fps
, int spool_src
);
2892 size_t dirserv_estimate_data_size(smartlist_t
*fps
, int is_serverdescs
,
2894 int routerstatus_format_entry(char *buf
, size_t buf_len
,
2895 routerstatus_t
*rs
, const char *platform
,
2896 int first_line_only
);
2897 void dirserv_free_all(void);
2898 void cached_dir_decref(cached_dir_t
*d
);
2899 cached_dir_t
*new_cached_dir(char *s
, time_t published
);
2901 /********************************* dirvote.c ************************/
2903 /** Lowest allowable value for VoteSeconds. */
2904 #define MIN_VOTE_SECONDS 20
2905 /** Lowest allowable value for DistSeconds. */
2906 #define MIN_DIST_SECONDS 20
2907 /** Smallest allowable voting interval. */
2908 #define MIN_VOTE_INTERVAL 300
2910 /** If there is no consensus, what interval do we default to? */
2911 #define DEFAULT_VOTING_INTERVAL_WHEN_NO_CONSENSUS (30*60)
2913 void dirvote_free_all(void);
2915 /* vote manipulation */
2916 char *networkstatus_compute_consensus(smartlist_t
*votes
,
2917 int total_authorities
,
2918 crypto_pk_env_t
*identity_key
,
2919 crypto_pk_env_t
*signing_key
);
2920 int networkstatus_add_detached_signatures(networkstatus_vote_t
*target
,
2921 ns_detached_signatures_t
*sigs
,
2922 const char **msg_out
);
2923 char *networkstatus_get_detached_signatures(networkstatus_vote_t
*consensus
);
2924 void ns_detached_signatures_free(ns_detached_signatures_t
*s
);
2926 /* cert manipulation */
2927 authority_cert_t
*authority_cert_dup(authority_cert_t
*cert
);
2929 /** Describes the schedule by which votes should be generated. */
2930 typedef struct vote_timing_t
{
2932 int n_intervals_valid
;
2936 /* vote scheduling */
2937 void dirvote_get_preferred_voting_intervals(vote_timing_t
*timing_out
);
2938 time_t dirvote_get_start_of_next_interval(time_t now
, int interval
);
2939 void dirvote_recalculate_timing(or_options_t
*options
, time_t now
);
2940 void dirvote_act(or_options_t
*options
, time_t now
);
2942 /* invoked on timers and by outside triggers. */
2943 struct pending_vote_t
* dirvote_add_vote(const char *vote_body
,
2944 const char **msg_out
,
2946 int dirvote_add_signatures(const char *detached_signatures_body
,
2947 const char **msg_out
);
2950 const char *dirvote_get_pending_consensus(void);
2951 const char *dirvote_get_pending_detached_signatures(void);
2953 #define DGV_INCLUDE_PENDING 2
2954 #define DGV_INCLUDE_PREVIOUS 4
2955 const cached_dir_t
*dirvote_get_vote(const char *fp
, int flags
);
2956 networkstatus_vote_t
*
2957 dirserv_generate_networkstatus_vote_obj(crypto_pk_env_t
*private_key
,
2958 authority_cert_t
*cert
);
2960 #ifdef DIRVOTE_PRIVATE
2962 format_networkstatus_vote(crypto_pk_env_t
*private_key
,
2963 networkstatus_vote_t
*v3_ns
);
2966 /********************************* dns.c ***************************/
2969 void dns_free_all(void);
2970 uint32_t dns_clip_ttl(uint32_t ttl
);
2971 int dns_reset(void);
2972 void connection_dns_remove(edge_connection_t
*conn
);
2973 void assert_connection_edge_not_dns_pending(edge_connection_t
*conn
);
2974 void assert_all_pending_dns_resolves_ok(void);
2975 void dns_cancel_pending_resolve(const char *question
);
2976 int dns_resolve(edge_connection_t
*exitconn
);
2977 void dns_launch_correctness_checks(void);
2978 int dns_seems_to_be_broken(void);
2979 void dns_reset_correctness_checks(void);
2981 /********************************* dnsserv.c ************************/
2983 void dnsserv_configure_listener(connection_t
*conn
);
2984 void dnsserv_close_listener(connection_t
*conn
);
2985 void dnsserv_resolved(edge_connection_t
*conn
,
2990 void dnsserv_reject_request(edge_connection_t
*conn
);
2991 void dnsserv_launch_request(const char *name
, int is_reverse
);
2993 /********************************* hibernate.c **********************/
2995 int accounting_parse_options(or_options_t
*options
, int validate_only
);
2996 int accounting_is_enabled(or_options_t
*options
);
2997 void configure_accounting(time_t now
);
2998 void accounting_run_housekeeping(time_t now
);
2999 void accounting_add_bytes(size_t n_read
, size_t n_written
, int seconds
);
3000 int accounting_record_bandwidth_usage(time_t now
, or_state_t
*state
);
3001 void hibernate_begin_shutdown(void);
3002 int we_are_hibernating(void);
3003 void consider_hibernation(time_t now
);
3004 int getinfo_helper_accounting(control_connection_t
*conn
,
3005 const char *question
, char **answer
);
3006 void accounting_set_bandwidth_usage_from_state(or_state_t
*state
);
3008 /********************************* main.c ***************************/
3010 extern int has_completed_circuit
;
3012 int connection_add(connection_t
*conn
);
3013 int connection_remove(connection_t
*conn
);
3014 int connection_in_array(connection_t
*conn
);
3015 void add_connection_to_closeable_list(connection_t
*conn
);
3016 int connection_is_on_closeable_list(connection_t
*conn
);
3018 smartlist_t
*get_connection_array(void);
3020 void connection_watch_events(connection_t
*conn
, short events
);
3021 int connection_is_reading(connection_t
*conn
);
3022 void connection_stop_reading(connection_t
*conn
);
3023 void connection_start_reading(connection_t
*conn
);
3025 int connection_is_writing(connection_t
*conn
);
3026 void connection_stop_writing(connection_t
*conn
);
3027 void connection_start_writing(connection_t
*conn
);
3029 void connection_stop_reading_from_linked_conn(connection_t
*conn
);
3031 void directory_all_unreachable(time_t now
);
3032 void directory_info_has_arrived(time_t now
, int from_cache
);
3034 void ip_address_changed(int at_interface
);
3035 void dns_servers_relaunch_checks(void);
3037 void control_signal_act(int the_signal
);
3038 void handle_signals(int is_parent
);
3039 void tor_cleanup(void);
3040 void tor_free_all(int postfork
);
3042 int tor_main(int argc
, char *argv
[]);
3045 int do_main_loop(void);
3046 int do_list_fingerprint(void);
3047 void do_hash_password(void);
3048 int tor_init(int argc
, char **argv
);
3051 /********************************* networkstatus.c *********************/
3053 /** How old do we allow a v2 network-status to get before removing it
3055 #define MAX_NETWORKSTATUS_AGE (10*24*60*60)
3058 NS_FROM_CACHE
, NS_FROM_DIR_BY_FP
, NS_FROM_DIR_ALL
, NS_GENERATED
3059 } networkstatus_source_t
;
3061 typedef enum version_status_t
{
3062 VS_RECOMMENDED
=0, /**< This version is listed as recommended. */
3063 VS_OLD
=1, /**< This version is older than any recommended version. */
3064 VS_NEW
=2, /**< This version is newer than any recommended version. */
3065 VS_NEW_IN_SERIES
=3, /**< This version is newer than any recommended version
3066 * in its series, but later recommended versions exist.
3068 VS_UNRECOMMENDED
=4, /**< This version is not recommended (general case). */
3069 VS_UNKNOWN
, /**< We have no idea. */
3072 void networkstatus_reset_warnings(void);
3073 void networkstatus_reset_download_failures(void);
3074 int router_reload_v2_networkstatus(void);
3075 int router_reload_consensus_networkstatus(void);
3076 void routerstatus_free(routerstatus_t
*rs
);
3077 void networkstatus_v2_free(networkstatus_v2_t
*ns
);
3078 void networkstatus_vote_free(networkstatus_vote_t
*ns
);
3079 networkstatus_voter_info_t
*networkstatus_get_voter_by_id(
3080 networkstatus_vote_t
*vote
,
3081 const char *identity
);
3082 int networkstatus_check_consensus_signature(networkstatus_vote_t
*consensus
,
3084 int networkstatus_check_voter_signature(networkstatus_vote_t
*consensus
,
3085 networkstatus_voter_info_t
*voter
,
3086 authority_cert_t
*cert
);
3087 char *networkstatus_get_cache_filename(const char *identity_digest
);
3088 int router_set_networkstatus_v2(const char *s
, time_t arrived_at
,
3089 networkstatus_source_t source
,
3090 smartlist_t
*requested_fingerprints
);
3091 void networkstatus_v2_list_clean(time_t now
);
3092 routerstatus_t
*networkstatus_v2_find_entry(networkstatus_v2_t
*ns
,
3093 const char *digest
);
3094 routerstatus_t
*networkstatus_vote_find_entry(networkstatus_vote_t
*ns
,
3095 const char *digest
);
3096 const smartlist_t
*networkstatus_get_v2_list(void);
3097 download_status_t
*router_get_dl_status_by_descriptor_digest(const char *d
);
3098 routerstatus_t
*router_get_consensus_status_by_id(const char *digest
);
3099 routerstatus_t
*router_get_consensus_status_by_descriptor_digest(
3100 const char *digest
);
3101 routerstatus_t
*router_get_consensus_status_by_nickname(const char *nickname
,
3102 int warn_if_unnamed
);
3103 const char *networkstatus_get_router_digest_by_nickname(const char *nickname
);
3104 int networkstatus_nickname_is_unnamed(const char *nickname
);
3105 void networkstatus_consensus_download_failed(int status_code
);
3106 void update_consensus_networkstatus_fetch_time(time_t now
);
3107 int should_delay_dir_fetches(or_options_t
*options
);
3108 void update_networkstatus_downloads(time_t now
);
3109 void update_certificate_downloads(time_t now
);
3110 networkstatus_v2_t
*networkstatus_v2_get_by_digest(const char *digest
);
3111 networkstatus_vote_t
*networkstatus_get_latest_consensus(void);
3112 networkstatus_vote_t
*networkstatus_get_live_consensus(time_t now
);
3113 int networkstatus_set_current_consensus(const char *consensus
, int from_cache
,
3114 int was_waiting_for_certs
);
3115 void networkstatus_note_certs_arrived(void);
3116 void routers_update_all_from_networkstatus(time_t now
);
3117 void routerstatus_list_update_from_consensus_networkstatus(time_t now
);
3118 void routers_update_status_from_consensus_networkstatus(smartlist_t
*routers
,
3119 int reset_failures
);
3120 void signed_descs_update_status_from_consensus_networkstatus(
3121 smartlist_t
*descs
);
3123 char *networkstatus_getinfo_helper_single(routerstatus_t
*rs
);
3124 int getinfo_helper_networkstatus(control_connection_t
*conn
,
3125 const char *question
, char **answer
);
3126 void networkstatus_free_all(void);
3128 /********************************* ntmain.c ***************************/
3134 int nt_service_parse_options(int argc
, char **argv
, int *should_exit
);
3135 int nt_service_is_stopping(void);
3136 void nt_service_set_state(DWORD state
);
3138 #define nt_service_is_stopping() (0)
3141 /********************************* onion.c ***************************/
3143 int onion_pending_add(or_circuit_t
*circ
);
3144 or_circuit_t
*onion_next_task(void);
3145 void onion_pending_remove(or_circuit_t
*circ
);
3147 int onion_skin_create(crypto_pk_env_t
*router_key
,
3148 crypto_dh_env_t
**handshake_state_out
,
3149 char *onion_skin_out
);
3151 int onion_skin_server_handshake(const char *onion_skin
,
3152 crypto_pk_env_t
*private_key
,
3153 crypto_pk_env_t
*prev_private_key
,
3154 char *handshake_reply_out
,
3156 size_t key_out_len
);
3158 int onion_skin_client_handshake(crypto_dh_env_t
*handshake_state
,
3159 const char *handshake_reply
,
3161 size_t key_out_len
);
3163 int fast_server_handshake(const char *key_in
,
3164 char *handshake_reply_out
,
3166 size_t key_out_len
);
3168 int fast_client_handshake(const char *handshake_state
,
3169 const char *handshake_reply_out
,
3171 size_t key_out_len
);
3173 void clear_pending_onions(void);
3175 /********************************* policies.c ************************/
3177 /* (length of "accept 255.255.255.255/255.255.255.255:65535-65535\n" plus a
3180 #define POLICY_BUF_LEN 52
3183 ADDR_POLICY_ACCEPTED
=0,
3184 ADDR_POLICY_REJECTED
=-1,
3185 ADDR_POLICY_PROBABLY_ACCEPTED
=1,
3186 ADDR_POLICY_PROBABLY_REJECTED
=2
3187 } addr_policy_result_t
;
3189 int firewall_is_fascist_or(void);
3190 int fascist_firewall_allows_address_or(uint32_t addr
, uint16_t port
);
3191 int fascist_firewall_allows_address_dir(uint32_t addr
, uint16_t port
);
3192 int dir_policy_permits_address(uint32_t addr
);
3193 int socks_policy_permits_address(uint32_t addr
);
3194 int authdir_policy_permits_address(uint32_t addr
, uint16_t port
);
3195 int authdir_policy_valid_address(uint32_t addr
, uint16_t port
);
3196 int authdir_policy_badexit_address(uint32_t addr
, uint16_t port
);
3198 int validate_addr_policies(or_options_t
*options
, char **msg
);
3199 void policies_parse_from_options(or_options_t
*options
);
3201 int cmp_addr_policies(addr_policy_t
*a
, addr_policy_t
*b
);
3202 addr_policy_result_t
compare_addr_to_addr_policy(uint32_t addr
,
3203 uint16_t port
, addr_policy_t
*policy
);
3204 int policies_parse_exit_policy(config_line_t
*cfg
,
3205 addr_policy_t
**dest
,
3207 int exit_policy_is_general_exit(addr_policy_t
*policy
);
3208 int policy_is_reject_star(addr_policy_t
*policy
);
3209 int getinfo_helper_policies(control_connection_t
*conn
,
3210 const char *question
, char **answer
);
3211 int policy_write_item(char *buf
, size_t buflen
, addr_policy_t
*policy
);
3213 void addr_policy_free(addr_policy_t
*p
);
3214 void policies_free_all(void);
3216 /********************************* relay.c ***************************/
3218 extern uint64_t stats_n_relay_cells_relayed
;
3219 extern uint64_t stats_n_relay_cells_delivered
;
3221 int circuit_receive_relay_cell(cell_t
*cell
, circuit_t
*circ
,
3222 int cell_direction
);
3224 void relay_header_pack(char *dest
, const relay_header_t
*src
);
3225 void relay_header_unpack(relay_header_t
*dest
, const char *src
);
3226 int relay_send_command_from_edge(uint16_t stream_id
, circuit_t
*circ
,
3227 int relay_command
, const char *payload
,
3228 size_t payload_len
, crypt_path_t
*cpath_layer
);
3229 int connection_edge_send_command(edge_connection_t
*fromconn
,
3230 int relay_command
, const char *payload
,
3231 size_t payload_len
);
3232 int connection_edge_package_raw_inbuf(edge_connection_t
*conn
,
3233 int package_partial
);
3234 void connection_edge_consider_sending_sendme(edge_connection_t
*conn
);
3235 socks5_reply_status_t
connection_edge_end_reason_socks5_response(int reason
);
3236 int errno_to_end_reason(int e
);
3238 extern uint64_t stats_n_data_cells_packaged
;
3239 extern uint64_t stats_n_data_bytes_packaged
;
3240 extern uint64_t stats_n_data_cells_received
;
3241 extern uint64_t stats_n_data_bytes_received
;
3243 void init_cell_pool(void);
3244 void free_cell_pool(void);
3245 void clean_cell_pool(void);
3246 void dump_cell_pool_usage(int severity
);
3248 void cell_queue_clear(cell_queue_t
*queue
);
3249 void cell_queue_append(cell_queue_t
*queue
, packed_cell_t
*cell
);
3250 void cell_queue_append_packed_copy(cell_queue_t
*queue
, const cell_t
*cell
);
3252 void append_cell_to_circuit_queue(circuit_t
*circ
, or_connection_t
*orconn
,
3253 cell_t
*cell
, int direction
);
3254 void connection_or_unlink_all_active_circs(or_connection_t
*conn
);
3255 int connection_or_flush_from_first_active_circuit(or_connection_t
*conn
,
3257 void assert_active_circuits_ok(or_connection_t
*orconn
);
3258 void make_circuit_inactive_on_conn(circuit_t
*circ
, or_connection_t
*conn
);
3259 void make_circuit_active_on_conn(circuit_t
*circ
, or_connection_t
*conn
);
3260 void circuit_clear_cell_queue(circuit_t
*circ
, or_connection_t
*orconn
);
3262 /********************************* rephist.c ***************************/
3264 void rep_hist_init(void);
3265 void rep_hist_note_connect_failed(const char* nickname
, time_t when
);
3266 void rep_hist_note_connect_succeeded(const char* nickname
, time_t when
);
3267 void rep_hist_note_disconnect(const char* nickname
, time_t when
);
3268 void rep_hist_note_connection_died(const char* nickname
, time_t when
);
3269 void rep_hist_note_extend_succeeded(const char *from_name
,
3270 const char *to_name
);
3271 void rep_hist_note_extend_failed(const char *from_name
, const char *to_name
);
3272 void rep_hist_dump_stats(time_t now
, int severity
);
3273 void rep_hist_note_bytes_read(int num_bytes
, time_t when
);
3274 void rep_hist_note_bytes_written(int num_bytes
, time_t when
);
3275 int rep_hist_bandwidth_assess(void);
3276 char *rep_hist_get_bandwidth_lines(int for_extrainfo
);
3277 void rep_hist_update_state(or_state_t
*state
);
3278 int rep_hist_load_state(or_state_t
*state
, char **err
);
3279 void rep_history_clean(time_t before
);
3281 void rep_hist_note_router_reachable(const char *id
, time_t when
);
3282 void rep_hist_note_router_unreachable(const char *id
, time_t when
);
3283 int rep_hist_record_mtbf_data(void);
3284 int rep_hist_load_mtbf_data(time_t now
);
3286 time_t rep_hist_downrate_old_runs(time_t now
);
3287 double rep_hist_get_stability(const char *id
, time_t when
);
3288 double rep_hist_get_weighted_fractional_uptime(const char *id
, time_t when
);
3289 int rep_hist_have_measured_enough_stability(void);
3291 void rep_hist_note_used_port(uint16_t port
, time_t now
);
3292 smartlist_t
*rep_hist_get_predicted_ports(time_t now
);
3293 void rep_hist_note_used_resolve(time_t now
);
3294 void rep_hist_note_used_internal(time_t now
, int need_uptime
,
3296 int rep_hist_get_predicted_internal(time_t now
, int *need_uptime
,
3297 int *need_capacity
);
3299 int any_predicted_circuits(time_t now
);
3300 int rep_hist_circbuilding_dormant(time_t now
);
3302 /** Possible public/private key operations in Tor: used to keep track of where
3303 * we're spending our time. */
3306 VERIFY_DIR
, VERIFY_RTR
,
3307 ENC_ONIONSKIN
, DEC_ONIONSKIN
,
3308 TLS_HANDSHAKE_C
, TLS_HANDSHAKE_S
,
3309 REND_CLIENT
, REND_MID
, REND_SERVER
,
3311 void note_crypto_pk_op(pk_op_t operation
);
3312 void dump_pk_ops(int severity
);
3314 void rep_hist_free_all(void);
3316 /* for hidden service usage statistics */
3317 void hs_usage_note_publish_total(const char *service_id
, time_t now
);
3318 void hs_usage_note_publish_novel(const char *service_id
, time_t now
);
3319 void hs_usage_note_fetch_total(const char *service_id
, time_t now
);
3320 void hs_usage_note_fetch_successful(const char *service_id
, time_t now
);
3321 void hs_usage_write_statistics_to_file(time_t now
);
3322 void hs_usage_free_all(void);
3324 /********************************* rendclient.c ***************************/
3326 void rend_client_introcirc_has_opened(origin_circuit_t
*circ
);
3327 void rend_client_rendcirc_has_opened(origin_circuit_t
*circ
);
3328 int rend_client_introduction_acked(origin_circuit_t
*circ
, const char *request
,
3329 size_t request_len
);
3330 void rend_client_refetch_renddesc(const char *query
);
3331 int rend_client_remove_intro_point(extend_info_t
*failed_intro
,
3333 int rend_client_rendezvous_acked(origin_circuit_t
*circ
, const char *request
,
3334 size_t request_len
);
3335 int rend_client_receive_rendezvous(origin_circuit_t
*circ
, const char *request
,
3336 size_t request_len
);
3337 void rend_client_desc_here(const char *query
);
3339 extend_info_t
*rend_client_get_random_intro(const char *query
);
3341 int rend_client_send_introduction(origin_circuit_t
*introcirc
,
3342 origin_circuit_t
*rendcirc
);
3344 /********************************* rendcommon.c ***************************/
3346 /** Information used to connect to a hidden service. */
3347 typedef struct rend_service_descriptor_t
{
3348 crypto_pk_env_t
*pk
; /**< This service's public key. */
3349 int version
; /**< 0. */
3350 time_t timestamp
; /**< Time when the descriptor was generated. */
3351 uint16_t protocols
; /**< Bitmask: which rendezvous protocols are supported?
3352 * (We allow bits '0', '1', and '2' to be set.) */
3353 int n_intro_points
; /**< Number of introduction points. */
3354 /** Array of n_intro_points elements for this service's introduction points'
3355 * nicknames. Elements are removed from this array if introduction attempts
3357 char **intro_points
;
3358 /** Array of n_intro_points elements for this service's introduction points'
3359 * extend_infos, or NULL if this descriptor is V0. Elements are removed
3360 * from this array if introduction attempts fail. If this array is present,
3361 * its elements correspond to the elements of intro_points. */
3362 extend_info_t
**intro_point_extend_info
;
3363 } rend_service_descriptor_t
;
3365 int rend_cmp_service_ids(const char *one
, const char *two
);
3367 void rend_process_relay_cell(circuit_t
*circ
, int command
, size_t length
,
3368 const char *payload
);
3370 void rend_service_descriptor_free(rend_service_descriptor_t
*desc
);
3371 int rend_encode_service_descriptor(rend_service_descriptor_t
*desc
,
3372 crypto_pk_env_t
*key
,
3375 rend_service_descriptor_t
*rend_parse_service_descriptor(const char *str
,
3377 int rend_get_service_id(crypto_pk_env_t
*pk
, char *out
);
3379 /** A cached rendezvous descriptor. */
3380 typedef struct rend_cache_entry_t
{
3381 size_t len
; /**< Length of <b>desc</b> */
3382 time_t received
; /**< When was the descriptor received? */
3383 char *desc
; /**< Service descriptor */
3384 rend_service_descriptor_t
*parsed
; /**< Parsed value of 'desc' */
3385 } rend_cache_entry_t
;
3387 void rend_cache_init(void);
3388 void rend_cache_clean(void);
3389 void rend_cache_free_all(void);
3390 int rend_valid_service_id(const char *query
);
3391 int rend_cache_lookup_desc(const char *query
, int version
, const char **desc
,
3393 int rend_cache_lookup_entry(const char *query
, int version
,
3394 rend_cache_entry_t
**entry_out
);
3395 int rend_cache_store(const char *desc
, size_t desc_len
, int published
);
3396 int rend_cache_size(void);
3398 /********************************* rendservice.c ***************************/
3400 int num_rend_services(void);
3401 int rend_config_services(or_options_t
*options
, int validate_only
);
3402 int rend_service_load_keys(void);
3403 void rend_services_init(void);
3404 void rend_services_introduce(void);
3405 void rend_consider_services_upload(time_t now
);
3407 void rend_service_intro_has_opened(origin_circuit_t
*circuit
);
3408 int rend_service_intro_established(origin_circuit_t
*circuit
,
3409 const char *request
,
3410 size_t request_len
);
3411 void rend_service_rendezvous_has_opened(origin_circuit_t
*circuit
);
3412 int rend_service_introduce(origin_circuit_t
*circuit
, const char *request
,
3413 size_t request_len
);
3414 void rend_service_relaunch_rendezvous(origin_circuit_t
*oldcirc
);
3415 int rend_service_set_connection_addr_port(edge_connection_t
*conn
,
3416 origin_circuit_t
*circ
);
3417 void rend_service_dump_stats(int severity
);
3418 void rend_service_free_all(void);
3420 /********************************* rendmid.c *******************************/
3421 int rend_mid_establish_intro(or_circuit_t
*circ
, const char *request
,
3422 size_t request_len
);
3423 int rend_mid_introduce(or_circuit_t
*circ
, const char *request
,
3424 size_t request_len
);
3425 int rend_mid_establish_rendezvous(or_circuit_t
*circ
, const char *request
,
3426 size_t request_len
);
3427 int rend_mid_rendezvous(or_circuit_t
*circ
, const char *request
,
3428 size_t request_len
);
3430 /********************************* router.c ***************************/
3432 crypto_pk_env_t
*get_onion_key(void);
3433 time_t get_onion_key_set_at(void);
3434 void set_identity_key(crypto_pk_env_t
*k
);
3435 crypto_pk_env_t
*get_identity_key(void);
3436 int identity_key_is_set(void);
3437 authority_cert_t
*get_my_v3_authority_cert(void);
3438 crypto_pk_env_t
*get_my_v3_authority_signing_key(void);
3439 void dup_onion_keys(crypto_pk_env_t
**key
, crypto_pk_env_t
**last
);
3440 void rotate_onion_key(void);
3441 crypto_pk_env_t
*init_key_from_file(const char *fname
, int generate
,
3443 void v3_authority_check_key_expiry(void);
3445 int init_keys(void);
3447 int check_whether_orport_reachable(void);
3448 int check_whether_dirport_reachable(void);
3449 void consider_testing_reachability(int test_or
, int test_dir
);
3450 void router_orport_found_reachable(void);
3451 void router_dirport_found_reachable(void);
3452 void router_perform_bandwidth_test(int num_circs
, time_t now
);
3454 int authdir_mode(or_options_t
*options
);
3455 int authdir_mode_v1(or_options_t
*options
);
3456 int authdir_mode_v2(or_options_t
*options
);
3457 int authdir_mode_v3(or_options_t
*options
);
3458 int authdir_mode_handles_descs(or_options_t
*options
);
3459 int authdir_mode_publishes_statuses(or_options_t
*options
);
3460 int authdir_mode_tests_reachability(or_options_t
*options
);
3461 int authdir_mode_bridge(or_options_t
*options
);
3462 int authdir_mode_any_nonbridge(or_options_t
*options
);
3463 int clique_mode(or_options_t
*options
);
3464 int dirserver_mode(or_options_t
*options
);
3465 int server_mode(or_options_t
*options
);
3466 int advertised_server_mode(void);
3467 int proxy_mode(or_options_t
*options
);
3468 void consider_publishable_server(int force
);
3470 int router_is_clique_mode(routerinfo_t
*router
);
3471 void router_upload_dir_desc_to_dirservers(int force
);
3472 void mark_my_descriptor_dirty_if_older_than(time_t when
);
3473 void mark_my_descriptor_dirty(void);
3474 void check_descriptor_bandwidth_changed(time_t now
);
3475 void check_descriptor_ipaddress_changed(time_t now
);
3476 void router_new_address_suggestion(const char *suggestion
);
3477 int router_compare_to_my_exit_policy(edge_connection_t
*conn
);
3478 routerinfo_t
*router_get_my_routerinfo(void);
3479 extrainfo_t
*router_get_my_extrainfo(void);
3480 const char *router_get_my_descriptor(void);
3481 int router_digest_is_me(const char *digest
);
3482 int router_is_me(routerinfo_t
*router
);
3483 int router_fingerprint_is_me(const char *fp
);
3484 int router_pick_published_address(or_options_t
*options
, uint32_t *addr
);
3485 int router_rebuild_descriptor(int force
);
3486 int router_dump_router_to_string(char *s
, size_t maxlen
, routerinfo_t
*router
,
3487 crypto_pk_env_t
*ident_key
);
3488 int extrainfo_dump_to_string(char *s
, size_t maxlen
, extrainfo_t
*extrainfo
,
3489 crypto_pk_env_t
*ident_key
);
3490 int is_legal_nickname(const char *s
);
3491 int is_legal_nickname_or_hexdigest(const char *s
);
3492 int is_legal_hexdigest(const char *s
);
3493 void router_get_verbose_nickname(char *buf
, routerinfo_t
*router
);
3494 void router_reset_warnings(void);
3495 void router_reset_reachability(void);
3496 void router_free_all(void);
3498 const char *router_purpose_to_string(uint8_t p
);
3499 uint8_t router_purpose_from_string(const char *s
);
3501 #ifdef ROUTER_PRIVATE
3502 /* Used only by router.c and test.c */
3503 void get_platform_str(char *platform
, size_t len
);
3506 /********************************* routerlist.c ***************************/
3508 /** Represents information about a single trusted directory server. */
3509 typedef struct trusted_dir_server_t
{
3512 char *address
; /**< Hostname. */
3513 uint32_t addr
; /**< IPv4 address. */
3514 uint16_t dir_port
; /**< Directory port. */
3515 uint16_t or_port
; /**< OR port: Used for tunneling connections. */
3516 char digest
[DIGEST_LEN
]; /**< Digest of identity key. */
3517 char v3_identity_digest
[DIGEST_LEN
]; /**< Digest of v3 (authority only,
3518 * high-security) identity key. */
3520 unsigned int is_running
:1; /**< True iff we think this server is running. */
3522 /** True iff this server has accepted the most recent server descriptor
3523 * we tried to upload to it. */
3524 unsigned int has_accepted_serverdesc
:1;
3526 /** What kind of authority is this? (Bitfield.) */
3527 authority_type_t type
;
3529 smartlist_t
*v3_certs
; /**< V3 key certificates for this authority */
3530 download_status_t cert_dl_status
; /**< Status of downloading this server's
3531 * latest certificate. */
3532 download_status_t v2_ns_dl_status
; /**< Status of downloading this server's
3533 * v2 network status. */
3535 routerstatus_t fake_status
; /**< Used when we need to pass this trusted
3536 * dir_server_t to directory_initiate_command_*
3537 * as a routerstatus_t. Not updated by the
3538 * router-status management code!
3540 } trusted_dir_server_t
;
3542 #define ROUTER_REQUIRED_MIN_BANDWIDTH 10000
3544 #define ROUTER_MAX_DECLARED_BANDWIDTH INT32_MAX
3546 int get_n_authorities(authority_type_t type
);
3547 int trusted_dirs_reload_certs(void);
3548 int trusted_dirs_load_certs_from_string(const char *contents
, int from_store
);
3549 void trusted_dirs_flush_certs_to_disk(void);
3550 authority_cert_t
*authority_cert_get_newest_by_id(const char *id_digest
);
3551 authority_cert_t
*authority_cert_get_by_sk_digest(const char *sk_digest
);
3552 authority_cert_t
*authority_cert_get_by_digests(const char *id_digest
,
3553 const char *sk_digest
);
3554 void authority_certs_fetch_missing(networkstatus_vote_t
*status
, time_t now
);
3555 int router_reload_router_list(void);
3556 smartlist_t
*router_get_trusted_dir_servers(void);
3557 routerstatus_t
*router_pick_directory_server(int requireother
,
3558 int fascistfirewall
,
3559 authority_type_t type
,
3560 int retry_if_no_servers
);
3561 trusted_dir_server_t
*router_get_trusteddirserver_by_digest(const char *d
);
3562 trusted_dir_server_t
*trusteddirserver_get_by_v3_auth_digest(const char *d
);
3563 routerstatus_t
*router_pick_trusteddirserver(authority_type_t type
,
3565 int fascistfirewall
,
3566 int retry_if_no_servers
);
3567 void router_reset_status_download_failures(void);
3568 void routerlist_add_family(smartlist_t
*sl
, routerinfo_t
*router
);
3569 int routers_in_same_family(routerinfo_t
*r1
, routerinfo_t
*r2
);
3570 void add_nickname_list_to_smartlist(smartlist_t
*sl
, const char *list
,
3571 int must_be_running
);
3572 int router_nickname_is_in_list(routerinfo_t
*router
, const char *list
);
3573 routerinfo_t
*routerlist_find_my_routerinfo(void);
3574 routerinfo_t
*router_find_exact_exit_enclave(const char *address
,
3576 int router_is_unreliable(routerinfo_t
*router
, int need_uptime
,
3577 int need_capacity
, int need_guard
);
3578 uint32_t router_get_advertised_bandwidth(routerinfo_t
*router
);
3581 NO_WEIGHTING
, WEIGHT_FOR_EXIT
, WEIGHT_FOR_GUARD
3582 } bandwidth_weight_rule_t
;
3583 routerinfo_t
*routerlist_sl_choose_by_bandwidth(smartlist_t
*sl
,
3584 bandwidth_weight_rule_t rule
);
3585 routerstatus_t
*routerstatus_sl_choose_by_bandwidth(smartlist_t
*sl
);
3586 routerinfo_t
*router_choose_random_node(const char *preferred
,
3587 const char *excluded
,
3588 smartlist_t
*excludedsmartlist
,
3589 int need_uptime
, int need_capacity
,
3591 int allow_invalid
, int strict
,
3592 int weight_for_exit
);
3593 routerinfo_t
*router_get_by_nickname(const char *nickname
,
3594 int warn_if_unnamed
);
3595 int router_digest_version_as_new_as(const char *digest
, const char *cutoff
);
3596 int router_digest_is_trusted_dir_type(const char *digest
,
3597 authority_type_t type
);
3598 #define router_digest_is_trusted_dir(d) \
3599 router_digest_is_trusted_dir_type((d), 0)
3601 int router_addr_is_trusted_dir(uint32_t addr
);
3602 int hexdigest_to_digest(const char *hexdigest
, char *digest
);
3603 routerinfo_t
*router_get_by_hexdigest(const char *hexdigest
);
3604 routerinfo_t
*router_get_by_digest(const char *digest
);
3605 signed_descriptor_t
*router_get_by_descriptor_digest(const char *digest
);
3606 signed_descriptor_t
*router_get_by_extrainfo_digest(const char *digest
);
3607 signed_descriptor_t
*extrainfo_get_by_descriptor_digest(const char *digest
);
3608 const char *signed_descriptor_get_body(signed_descriptor_t
*desc
);
3609 routerlist_t
*router_get_routerlist(void);
3610 void routerinfo_free(routerinfo_t
*router
);
3611 void extrainfo_free(extrainfo_t
*extrainfo
);
3612 void routerlist_free(routerlist_t
*rl
);
3613 void dump_routerlist_mem_usage(int severity
);
3614 void routerlist_remove(routerlist_t
*rl
, routerinfo_t
*ri
, int make_old
);
3615 void routerlist_free_all(void);
3616 void routerlist_reset_warnings(void);
3617 void router_set_status(const char *digest
, int up
);
3618 int router_add_to_routerlist(routerinfo_t
*router
, const char **msg
,
3619 int from_cache
, int from_fetch
);
3620 int router_add_extrainfo_to_routerlist(extrainfo_t
*ei
, const char **msg
,
3621 int from_cache
, int from_fetch
);
3622 void routerlist_remove_old_routers(void);
3623 int router_load_single_router(const char *s
, uint8_t purpose
, int cache
,
3625 void router_load_routers_from_string(const char *s
, const char *eos
,
3626 saved_location_t saved_location
,
3627 smartlist_t
*requested_fingerprints
,
3628 int descriptor_digests
,
3629 const char *prepend_annotations
);
3630 void router_load_extrainfo_from_string(const char *s
, const char *eos
,
3631 saved_location_t saved_location
,
3632 smartlist_t
*requested_fingerprints
,
3633 int descriptor_digests
);
3634 void routerlist_retry_directory_downloads(time_t now
);
3635 int router_exit_policy_all_routers_reject(uint32_t addr
, uint16_t port
,
3637 int router_exit_policy_rejects_all(routerinfo_t
*router
);
3638 void add_trusted_dir_server(const char *nickname
, const char *address
,
3639 uint16_t dir_port
, uint16_t or_port
,
3640 const char *digest
, const char *v3_auth_digest
,
3641 authority_type_t type
);
3642 void authority_cert_free(authority_cert_t
*cert
);
3643 void clear_trusted_dir_servers(void);
3644 int any_trusted_dir_is_v1_authority(void);
3645 void update_router_descriptor_downloads(time_t now
);
3646 void update_extrainfo_downloads(time_t now
);
3647 int router_have_minimum_dir_info(void);
3648 void router_dir_info_changed(void);
3649 void router_reset_descriptor_download_failures(void);
3650 int router_differences_are_cosmetic(routerinfo_t
*r1
, routerinfo_t
*r2
);
3651 int routerinfo_incompatible_with_extrainfo(routerinfo_t
*ri
, extrainfo_t
*ei
,
3652 signed_descriptor_t
*sd
,
3654 void routerlist_assert_ok(routerlist_t
*rl
);
3655 const char *esc_router_info(routerinfo_t
*router
);
3656 void routers_sort_by_identity(smartlist_t
*routers
);
3658 /********************************* routerparse.c ************************/
3660 #define MAX_STATUS_TAG_LEN 32
3661 /** Structure to hold parsed Tor versions. This is a little messier
3662 * than we would like it to be, because we changed version schemes with 0.1.0.
3664 * See version-spec.txt for the whole business.
3666 typedef struct tor_version_t
{
3670 /** Release status. For version in the post-0.1 format, this is always
3672 enum { VER_PRE
=0, VER_RC
=1, VER_RELEASE
=2, } status
;
3674 char status_tag
[MAX_STATUS_TAG_LEN
];
3678 int router_get_router_hash(const char *s
, char *digest
);
3679 int router_get_dir_hash(const char *s
, char *digest
);
3680 int router_get_runningrouters_hash(const char *s
, char *digest
);
3681 int router_get_networkstatus_v2_hash(const char *s
, char *digest
);
3682 int router_get_networkstatus_v3_hash(const char *s
, char *digest
);
3683 int router_get_extrainfo_hash(const char *s
, char *digest
);
3684 int router_append_dirobj_signature(char *buf
, size_t buf_len
,
3686 crypto_pk_env_t
*private_key
);
3687 int router_parse_list_from_string(const char **s
, const char *eos
,
3689 saved_location_t saved_location
,
3691 int allow_annotations
,
3692 const char *prepend_annotations
);
3693 int router_parse_routerlist_from_directory(const char *s
,
3694 routerlist_t
**dest
,
3695 crypto_pk_env_t
*pkey
,
3697 int write_to_cache
);
3698 int router_parse_runningrouters(const char *str
);
3699 int router_parse_directory(const char *str
);
3700 routerinfo_t
*router_parse_entry_from_string(const char *s
, const char *end
,
3702 int allow_annotations
,
3703 const char *prepend_annotations
);
3704 extrainfo_t
*extrainfo_parse_entry_from_string(const char *s
, const char *end
,
3705 int cache_copy
, struct digest_ri_map_t
*routermap
);
3706 addr_policy_t
*router_parse_addr_policy_from_string(const char *s
,
3708 version_status_t
tor_version_is_obsolete(const char *myversion
,
3709 const char *versionlist
);
3710 int tor_version_parse(const char *s
, tor_version_t
*out
);
3711 int tor_version_as_new_as(const char *platform
, const char *cutoff
);
3712 int tor_version_compare(tor_version_t
*a
, tor_version_t
*b
);
3713 void sort_version_list(smartlist_t
*lst
, int remove_duplicates
);
3714 void assert_addr_policy_ok(addr_policy_t
*t
);
3715 void dump_distinct_digest_count(int severity
);
3717 networkstatus_v2_t
*networkstatus_v2_parse_from_string(const char *s
);
3718 networkstatus_vote_t
*networkstatus_parse_vote_from_string(const char *s
,
3719 const char **eos_out
,
3721 ns_detached_signatures_t
*networkstatus_parse_detached_signatures(
3722 const char *s
, const char *eos
);
3724 authority_cert_t
*authority_cert_parse_from_string(const char *s
,
3725 const char **end_of_string
);