1 /* Copyright (c) 2001 Matej Pfajfar.
2 * Copyright (c) 2001-2004, Roger Dingledine.
3 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
4 * Copyright (c) 2007-2009, The Tor Project, Inc. */
5 /* See LICENSE for licensing information */
8 * \file connection_edge.c
9 * \brief Handle edge streams.
14 #ifdef HAVE_LINUX_TYPES_H
15 #include <linux/types.h>
17 #ifdef HAVE_LINUX_NETFILTER_IPV4_H
18 #include <linux/netfilter_ipv4.h>
19 #define TRANS_NETFILTER
22 #if defined(HAVE_NET_IF_H) && defined(HAVE_NET_PFVAR_H)
24 #include <net/pfvar.h>
28 #define SOCKS4_GRANTED 90
29 #define SOCKS4_REJECT 91
31 static int connection_ap_handshake_process_socks(edge_connection_t
*conn
);
32 static int connection_ap_process_natd(edge_connection_t
*conn
);
33 static int connection_exit_connect_dir(edge_connection_t
*exitconn
);
34 static int address_is_in_virtual_range(const char *addr
);
35 static int consider_plaintext_ports(edge_connection_t
*conn
, uint16_t port
);
36 static void clear_trackexithost_mappings(const char *exitname
);
38 /** An AP stream has failed/finished. If it hasn't already sent back
39 * a socks reply, send one now (based on endreason). Also set
40 * has_sent_end to 1, and mark the conn.
43 _connection_mark_unattached_ap(edge_connection_t
*conn
, int endreason
,
44 int line
, const char *file
)
46 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
47 conn
->edge_has_sent_end
= 1; /* no circ yet */
49 if (conn
->_base
.marked_for_close
) {
50 /* This call will warn as appropriate. */
51 _connection_mark_for_close(TO_CONN(conn
), line
, file
);
55 if (!conn
->socks_request
->has_finished
) {
56 if (endreason
& END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
)
58 "stream (marked at %s:%d) sending two socks replies?",
61 if (SOCKS_COMMAND_IS_CONNECT(conn
->socks_request
->command
))
62 connection_ap_handshake_socks_reply(conn
, NULL
, 0, endreason
);
63 else if (SOCKS_COMMAND_IS_RESOLVE(conn
->socks_request
->command
))
64 connection_ap_handshake_socks_resolved(conn
,
65 RESOLVED_TYPE_ERROR_TRANSIENT
,
67 else /* unknown or no handshake at all. send no response. */
68 conn
->socks_request
->has_finished
= 1;
71 _connection_mark_for_close(TO_CONN(conn
), line
, file
);
72 conn
->_base
.hold_open_until_flushed
= 1;
73 conn
->end_reason
= endreason
;
76 /** There was an EOF. Send an end and mark the connection for close.
79 connection_edge_reached_eof(edge_connection_t
*conn
)
81 if (buf_datalen(conn
->_base
.inbuf
) &&
82 connection_state_is_open(TO_CONN(conn
))) {
83 /* it still has stuff to process. don't let it die yet. */
86 log_info(LD_EDGE
,"conn (fd %d) reached eof. Closing.", conn
->_base
.s
);
87 if (!conn
->_base
.marked_for_close
) {
88 /* only mark it if not already marked. it's possible to
89 * get the 'end' right around when the client hangs up on us. */
90 connection_edge_end(conn
, END_STREAM_REASON_DONE
);
91 if (conn
->socks_request
) /* eof, so don't send a socks reply back */
92 conn
->socks_request
->has_finished
= 1;
93 connection_mark_for_close(TO_CONN(conn
));
98 /** Handle new bytes on conn->inbuf based on state:
99 * - If it's waiting for socks info, try to read another step of the
100 * socks handshake out of conn->inbuf.
101 * - If it's waiting for the original destination, fetch it.
102 * - If it's open, then package more relay cells from the stream.
103 * - Else, leave the bytes on inbuf alone for now.
105 * Mark and return -1 if there was an unexpected error with the conn,
109 connection_edge_process_inbuf(edge_connection_t
*conn
, int package_partial
)
113 switch (conn
->_base
.state
) {
114 case AP_CONN_STATE_SOCKS_WAIT
:
115 if (connection_ap_handshake_process_socks(conn
) < 0) {
120 case AP_CONN_STATE_NATD_WAIT
:
121 if (connection_ap_process_natd(conn
) < 0) {
126 case AP_CONN_STATE_OPEN
:
127 case EXIT_CONN_STATE_OPEN
:
128 if (connection_edge_package_raw_inbuf(conn
, package_partial
) < 0) {
129 /* (We already sent an end cell if possible) */
130 connection_mark_for_close(TO_CONN(conn
));
134 case EXIT_CONN_STATE_CONNECTING
:
135 case AP_CONN_STATE_RENDDESC_WAIT
:
136 case AP_CONN_STATE_CIRCUIT_WAIT
:
137 case AP_CONN_STATE_CONNECT_WAIT
:
138 case AP_CONN_STATE_RESOLVE_WAIT
:
139 case AP_CONN_STATE_CONTROLLER_WAIT
:
141 "data from edge while in '%s' state. Leaving it on buffer.",
142 conn_state_to_string(conn
->_base
.type
, conn
->_base
.state
));
145 log_warn(LD_BUG
,"Got unexpected state %d. Closing.",conn
->_base
.state
);
146 tor_fragile_assert();
147 connection_edge_end(conn
, END_STREAM_REASON_INTERNAL
);
148 connection_mark_for_close(TO_CONN(conn
));
152 /** This edge needs to be closed, because its circuit has closed.
153 * Mark it for close and return 0.
156 connection_edge_destroy(circid_t circ_id
, edge_connection_t
*conn
)
158 if (!conn
->_base
.marked_for_close
) {
160 "CircID %d: At an edge. Marking connection for close.", circ_id
);
161 if (conn
->_base
.type
== CONN_TYPE_AP
) {
162 connection_mark_unattached_ap(conn
, END_STREAM_REASON_DESTROY
);
163 control_event_stream_bandwidth(conn
);
164 control_event_stream_status(conn
, STREAM_EVENT_CLOSED
,
165 END_STREAM_REASON_DESTROY
);
166 conn
->end_reason
|= END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED
;
168 /* closing the circuit, nothing to send an END to */
169 conn
->edge_has_sent_end
= 1;
170 conn
->end_reason
= END_STREAM_REASON_DESTROY
;
171 conn
->end_reason
|= END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED
;
172 connection_mark_for_close(TO_CONN(conn
));
173 conn
->_base
.hold_open_until_flushed
= 1;
176 conn
->cpath_layer
= NULL
;
177 conn
->on_circuit
= NULL
;
181 /** Send a raw end cell to the stream with ID <b>stream_id</b> out over the
182 * <b>circ</b> towards the hop identified with <b>cpath_layer</b>. If this
183 * is not a client connection, set the relay end cell's reason for closing
184 * as <b>reason</b> */
186 relay_send_end_cell_from_edge(streamid_t stream_id
, circuit_t
*circ
,
187 uint8_t reason
, crypt_path_t
*cpath_layer
)
191 if (CIRCUIT_PURPOSE_IS_CLIENT(circ
->purpose
)) {
192 /* Never send the server an informative reason code; it doesn't need to
193 * know why the client stream is failing. */
194 reason
= END_STREAM_REASON_MISC
;
197 payload
[0] = (char) reason
;
199 return relay_send_command_from_edge(stream_id
, circ
, RELAY_COMMAND_END
,
200 payload
, 1, cpath_layer
);
203 /** Send a relay end cell from stream <b>conn</b> down conn's circuit, and
204 * remember that we've done so. If this is not a client connection, set the
205 * relay end cell's reason for closing as <b>reason</b>.
207 * Return -1 if this function has already been called on this conn,
211 connection_edge_end(edge_connection_t
*conn
, uint8_t reason
)
213 char payload
[RELAY_PAYLOAD_SIZE
];
214 size_t payload_len
=1;
216 uint8_t control_reason
= reason
;
218 if (conn
->edge_has_sent_end
) {
219 log_warn(LD_BUG
,"(Harmless.) Calling connection_edge_end (reason %d) "
220 "on an already ended stream?", reason
);
221 tor_fragile_assert();
225 if (conn
->_base
.marked_for_close
) {
227 "called on conn that's already marked for close at %s:%d.",
228 conn
->_base
.marked_for_close_file
, conn
->_base
.marked_for_close
);
232 circ
= circuit_get_by_edge_conn(conn
);
233 if (circ
&& CIRCUIT_PURPOSE_IS_CLIENT(circ
->purpose
)) {
234 /* If this is a client circuit, don't send the server an informative
235 * reason code; it doesn't need to know why the client stream is
237 reason
= END_STREAM_REASON_MISC
;
240 payload
[0] = (char)reason
;
241 if (reason
== END_STREAM_REASON_EXITPOLICY
&&
242 !connection_edge_is_rendezvous_stream(conn
)) {
244 if (tor_addr_family(&conn
->_base
.addr
) == AF_INET
) {
245 set_uint32(payload
+1, tor_addr_to_ipv4n(&conn
->_base
.addr
));
248 memcpy(payload
+1, tor_addr_to_in6_addr8(&conn
->_base
.addr
), 16);
251 set_uint32(payload
+1+addrlen
, htonl(dns_clip_ttl(conn
->address_ttl
)));
252 payload_len
+= 4+addrlen
;
255 if (circ
&& !circ
->marked_for_close
) {
256 log_debug(LD_EDGE
,"Sending end on conn (fd %d).",conn
->_base
.s
);
257 connection_edge_send_command(conn
, RELAY_COMMAND_END
,
258 payload
, payload_len
);
260 log_debug(LD_EDGE
,"No circ to send end on conn (fd %d).",
264 conn
->edge_has_sent_end
= 1;
265 conn
->end_reason
= control_reason
;
269 /** An error has just occurred on an operation on an edge connection
270 * <b>conn</b>. Extract the errno; convert it to an end reason, and send an
271 * appropriate relay end cell to the other end of the connection's circuit.
274 connection_edge_end_errno(edge_connection_t
*conn
)
278 reason
= errno_to_stream_end_reason(tor_socket_errno(conn
->_base
.s
));
279 return connection_edge_end(conn
, reason
);
282 /** Connection <b>conn</b> has finished writing and has no bytes left on
285 * If it's in state 'open', stop writing, consider responding with a
286 * sendme, and return.
287 * Otherwise, stop writing and return.
289 * If <b>conn</b> is broken, mark it for close and return -1, else
293 connection_edge_finished_flushing(edge_connection_t
*conn
)
297 switch (conn
->_base
.state
) {
298 case AP_CONN_STATE_OPEN
:
299 case EXIT_CONN_STATE_OPEN
:
300 connection_stop_writing(TO_CONN(conn
));
301 connection_edge_consider_sending_sendme(conn
);
303 case AP_CONN_STATE_SOCKS_WAIT
:
304 case AP_CONN_STATE_NATD_WAIT
:
305 case AP_CONN_STATE_RENDDESC_WAIT
:
306 case AP_CONN_STATE_CIRCUIT_WAIT
:
307 case AP_CONN_STATE_CONNECT_WAIT
:
308 case AP_CONN_STATE_CONTROLLER_WAIT
:
309 connection_stop_writing(TO_CONN(conn
));
312 log_warn(LD_BUG
, "Called in unexpected state %d.",conn
->_base
.state
);
313 tor_fragile_assert();
319 /** Connected handler for exit connections: start writing pending
320 * data, deliver 'CONNECTED' relay cells as appropriate, and check
321 * any pending data that may have been received. */
323 connection_edge_finished_connecting(edge_connection_t
*edge_conn
)
327 tor_assert(edge_conn
);
328 tor_assert(edge_conn
->_base
.type
== CONN_TYPE_EXIT
);
329 conn
= TO_CONN(edge_conn
);
330 tor_assert(conn
->state
== EXIT_CONN_STATE_CONNECTING
);
332 log_info(LD_EXIT
,"Exit connection to %s:%u (%s) established.",
333 escaped_safe_str(conn
->address
),conn
->port
,
334 safe_str(fmt_addr(&conn
->addr
)));
336 rep_hist_note_exit_stream_opened(conn
->port
, approx_time());
338 conn
->state
= EXIT_CONN_STATE_OPEN
;
339 connection_watch_events(conn
, READ_EVENT
); /* stop writing, keep reading */
340 if (connection_wants_to_flush(conn
)) /* in case there are any queued relay
342 connection_start_writing(conn
);
343 /* deliver a 'connected' relay cell back through the circuit. */
344 if (connection_edge_is_rendezvous_stream(edge_conn
)) {
345 if (connection_edge_send_command(edge_conn
,
346 RELAY_COMMAND_CONNECTED
, NULL
, 0) < 0)
347 return 0; /* circuit is closed, don't continue */
349 char connected_payload
[20];
350 int connected_payload_len
;
351 if (tor_addr_family(&conn
->addr
) == AF_INET
) {
352 set_uint32(connected_payload
, tor_addr_to_ipv4n(&conn
->addr
));
353 set_uint32(connected_payload
+4,
354 htonl(dns_clip_ttl(edge_conn
->address_ttl
)));
355 connected_payload_len
= 8;
357 memcpy(connected_payload
, tor_addr_to_in6_addr8(&conn
->addr
), 16);
358 set_uint32(connected_payload
+16,
359 htonl(dns_clip_ttl(edge_conn
->address_ttl
)));
360 connected_payload_len
= 20;
362 if (connection_edge_send_command(edge_conn
,
363 RELAY_COMMAND_CONNECTED
,
364 connected_payload
, connected_payload_len
) < 0)
365 return 0; /* circuit is closed, don't continue */
367 tor_assert(edge_conn
->package_window
> 0);
368 /* in case the server has written anything */
369 return connection_edge_process_inbuf(edge_conn
, 1);
372 /** Define a schedule for how long to wait between retrying
373 * application connections. Rather than waiting a fixed amount of
374 * time between each retry, we wait 10 seconds each for the first
375 * two tries, and 15 seconds for each retry after
376 * that. Hopefully this will improve the expected user experience. */
378 compute_retry_timeout(edge_connection_t
*conn
)
380 if (conn
->num_socks_retries
< 2) /* try 0 and try 1 */
385 /** Find all general-purpose AP streams waiting for a response that sent their
386 * begin/resolve cell >=15 seconds ago. Detach from their current circuit, and
387 * mark their current circuit as unsuitable for new streams. Then call
388 * connection_ap_handshake_attach_circuit() to attach to a new circuit (if
389 * available) or launch a new one.
391 * For rendezvous streams, simply give up after SocksTimeout seconds (with no
395 connection_ap_expire_beginning(void)
397 edge_connection_t
*conn
;
399 time_t now
= time(NULL
);
400 or_options_t
*options
= get_options();
403 int seconds_idle
, seconds_since_born
;
404 smartlist_t
*conns
= get_connection_array();
406 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, c
) {
407 if (c
->type
!= CONN_TYPE_AP
|| c
->marked_for_close
)
409 conn
= TO_EDGE_CONN(c
);
410 /* if it's an internal linked connection, don't yell its status. */
411 severity
= (tor_addr_is_null(&conn
->_base
.addr
) && !conn
->_base
.port
)
412 ? LOG_INFO
: LOG_NOTICE
;
413 seconds_idle
= (int)( now
- conn
->_base
.timestamp_lastread
);
414 seconds_since_born
= (int)( now
- conn
->_base
.timestamp_created
);
416 if (conn
->_base
.state
== AP_CONN_STATE_OPEN
)
419 /* We already consider SocksTimeout in
420 * connection_ap_handshake_attach_circuit(), but we need to consider
421 * it here too because controllers that put streams in controller_wait
422 * state never ask Tor to attach the circuit. */
423 if (AP_CONN_STATE_IS_UNATTACHED(conn
->_base
.state
)) {
424 if (seconds_since_born
>= options
->SocksTimeout
) {
425 log_fn(severity
, LD_APP
,
426 "Tried for %d seconds to get a connection to %s:%d. "
428 seconds_since_born
, safe_str(conn
->socks_request
->address
),
429 conn
->socks_request
->port
,
430 conn_state_to_string(CONN_TYPE_AP
, conn
->_base
.state
));
431 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TIMEOUT
);
436 /* We're in state connect_wait or resolve_wait now -- waiting for a
437 * reply to our relay cell. See if we want to retry/give up. */
439 cutoff
= compute_retry_timeout(conn
);
440 if (seconds_idle
< cutoff
)
442 circ
= circuit_get_by_edge_conn(conn
);
443 if (!circ
) { /* it's vanished? */
444 log_info(LD_APP
,"Conn is waiting (address %s), but lost its circ.",
445 safe_str(conn
->socks_request
->address
));
446 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TIMEOUT
);
449 if (circ
->purpose
== CIRCUIT_PURPOSE_C_REND_JOINED
) {
450 if (seconds_idle
>= options
->SocksTimeout
) {
451 log_fn(severity
, LD_REND
,
452 "Rend stream is %d seconds late. Giving up on address"
455 safe_str(conn
->socks_request
->address
));
456 connection_edge_end(conn
, END_STREAM_REASON_TIMEOUT
);
457 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TIMEOUT
);
461 tor_assert(circ
->purpose
== CIRCUIT_PURPOSE_C_GENERAL
);
462 log_fn(cutoff
< 15 ? LOG_INFO
: severity
, LD_APP
,
463 "We tried for %d seconds to connect to '%s' using exit '%s'."
464 " Retrying on a new circuit.",
465 seconds_idle
, safe_str(conn
->socks_request
->address
),
467 conn
->cpath_layer
->extend_info
->nickname
: "*unnamed*");
468 /* send an end down the circuit */
469 connection_edge_end(conn
, END_STREAM_REASON_TIMEOUT
);
470 /* un-mark it as ending, since we're going to reuse it */
471 conn
->edge_has_sent_end
= 0;
472 conn
->end_reason
= 0;
473 /* kludge to make us not try this circuit again, yet to allow
474 * current streams on it to survive if they can: make it
475 * unattractive to use for new streams */
476 tor_assert(circ
->timestamp_dirty
);
477 circ
->timestamp_dirty
-= options
->MaxCircuitDirtiness
;
478 /* give our stream another 'cutoff' seconds to try */
479 conn
->_base
.timestamp_lastread
+= cutoff
;
480 if (conn
->num_socks_retries
< 250) /* avoid overflow */
481 conn
->num_socks_retries
++;
482 /* move it back into 'pending' state, and try to attach. */
483 if (connection_ap_detach_retriable(conn
, TO_ORIGIN_CIRCUIT(circ
),
484 END_STREAM_REASON_TIMEOUT
)<0) {
485 if (!conn
->_base
.marked_for_close
)
486 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
488 } SMARTLIST_FOREACH_END(conn
);
491 /** Tell any AP streams that are waiting for a new circuit to try again,
492 * either attaching to an available circ or launching a new one.
495 connection_ap_attach_pending(void)
497 edge_connection_t
*edge_conn
;
498 smartlist_t
*conns
= get_connection_array();
499 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
501 if (conn
->marked_for_close
||
502 conn
->type
!= CONN_TYPE_AP
||
503 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
505 edge_conn
= TO_EDGE_CONN(conn
);
506 if (connection_ap_handshake_attach_circuit(edge_conn
) < 0) {
507 if (!edge_conn
->_base
.marked_for_close
)
508 connection_mark_unattached_ap(edge_conn
,
509 END_STREAM_REASON_CANT_ATTACH
);
514 /** Tell any AP streams that are waiting for a one-hop tunnel to
515 * <b>failed_digest</b> that they are going to fail. */
516 /* XXX022 We should get rid of this function, and instead attach
517 * one-hop streams to circ->p_streams so they get marked in
518 * circuit_mark_for_close like normal p_streams. */
520 connection_ap_fail_onehop(const char *failed_digest
,
521 cpath_build_state_t
*build_state
)
523 edge_connection_t
*edge_conn
;
524 char digest
[DIGEST_LEN
];
525 smartlist_t
*conns
= get_connection_array();
526 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
527 if (conn
->marked_for_close
||
528 conn
->type
!= CONN_TYPE_AP
||
529 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
531 edge_conn
= TO_EDGE_CONN(conn
);
532 if (!edge_conn
->want_onehop
)
534 if (hexdigest_to_digest(edge_conn
->chosen_exit_name
, digest
) < 0 ||
535 memcmp(digest
, failed_digest
, DIGEST_LEN
))
537 if (tor_digest_is_zero(digest
)) {
538 /* we don't know the digest; have to compare addr:port */
540 if (!build_state
|| !build_state
->chosen_exit
||
541 !edge_conn
->socks_request
|| !edge_conn
->socks_request
->address
)
543 if (tor_addr_from_str(&addr
, edge_conn
->socks_request
->address
)<0 ||
544 !tor_addr_eq(&build_state
->chosen_exit
->addr
, &addr
) ||
545 build_state
->chosen_exit
->port
!= edge_conn
->socks_request
->port
)
548 log_info(LD_APP
, "Closing one-hop stream to '%s/%s' because the OR conn "
549 "just failed.", edge_conn
->chosen_exit_name
,
550 edge_conn
->socks_request
->address
);
551 connection_mark_unattached_ap(edge_conn
, END_STREAM_REASON_TIMEOUT
);
552 } SMARTLIST_FOREACH_END(conn
);
555 /** A circuit failed to finish on its last hop <b>info</b>. If there
556 * are any streams waiting with this exit node in mind, but they
557 * don't absolutely require it, make them give up on it.
560 circuit_discard_optional_exit_enclaves(extend_info_t
*info
)
562 edge_connection_t
*edge_conn
;
563 routerinfo_t
*r1
, *r2
;
565 smartlist_t
*conns
= get_connection_array();
566 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
567 if (conn
->marked_for_close
||
568 conn
->type
!= CONN_TYPE_AP
||
569 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
571 edge_conn
= TO_EDGE_CONN(conn
);
572 if (!edge_conn
->chosen_exit_optional
&&
573 !edge_conn
->chosen_exit_retries
)
575 r1
= router_get_by_nickname(edge_conn
->chosen_exit_name
, 0);
576 r2
= router_get_by_nickname(info
->nickname
, 0);
577 if (!r1
|| !r2
|| r1
!= r2
)
579 tor_assert(edge_conn
->socks_request
);
580 if (edge_conn
->chosen_exit_optional
) {
581 log_info(LD_APP
, "Giving up on enclave exit '%s' for destination %s.",
582 safe_str(edge_conn
->chosen_exit_name
),
583 escaped_safe_str(edge_conn
->socks_request
->address
));
584 edge_conn
->chosen_exit_optional
= 0;
585 tor_free(edge_conn
->chosen_exit_name
); /* clears it */
586 /* if this port is dangerous, warn or reject it now that we don't
587 * think it'll be using an enclave. */
588 consider_plaintext_ports(edge_conn
, edge_conn
->socks_request
->port
);
590 if (edge_conn
->chosen_exit_retries
) {
591 if (--edge_conn
->chosen_exit_retries
== 0) { /* give up! */
592 clear_trackexithost_mappings(edge_conn
->chosen_exit_name
);
593 tor_free(edge_conn
->chosen_exit_name
); /* clears it */
594 /* if this port is dangerous, warn or reject it now that we don't
595 * think it'll be using an enclave. */
596 consider_plaintext_ports(edge_conn
, edge_conn
->socks_request
->port
);
599 } SMARTLIST_FOREACH_END(conn
);
602 /** The AP connection <b>conn</b> has just failed while attaching or
603 * sending a BEGIN or resolving on <b>circ</b>, but another circuit
604 * might work. Detach the circuit, and either reattach it, launch a
605 * new circuit, tell the controller, or give up as a appropriate.
607 * Returns -1 on err, 1 on success, 0 on not-yet-sure.
610 connection_ap_detach_retriable(edge_connection_t
*conn
, origin_circuit_t
*circ
,
613 control_event_stream_status(conn
, STREAM_EVENT_FAILED_RETRIABLE
, reason
);
614 conn
->_base
.timestamp_lastread
= time(NULL
);
615 if (!get_options()->LeaveStreamsUnattached
|| conn
->use_begindir
) {
616 /* If we're attaching streams ourself, or if this connection is
617 * a tunneled directory connection, then just attach it. */
618 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
619 circuit_detach_stream(TO_CIRCUIT(circ
),conn
);
620 return connection_ap_handshake_attach_circuit(conn
);
622 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
623 circuit_detach_stream(TO_CIRCUIT(circ
),conn
);
628 /** A client-side struct to remember requests to rewrite addresses
629 * to new addresses. These structs are stored in the hash table
630 * "addressmap" below.
632 * There are 5 ways to set an address mapping:
633 * - A MapAddress command from the controller [permanent]
634 * - An AddressMap directive in the torrc [permanent]
635 * - When a TrackHostExits torrc directive is triggered [temporary]
636 * - When a DNS resolve succeeds [temporary]
637 * - When a DNS resolve fails [temporary]
639 * When an addressmap request is made but one is already registered,
640 * the new one is replaced only if the currently registered one has
641 * no "new_address" (that is, it's in the process of DNS resolve),
642 * or if the new one is permanent (expires==0 or 1).
644 * (We overload the 'expires' field, using "0" for mappings set via
645 * the configuration file, "1" for mappings set from the control
646 * interface, and other values for DNS and TrackHostExit mappings that can
652 addressmap_entry_source_t source
:3;
653 short num_resolve_failures
;
654 } addressmap_entry_t
;
656 /** Entry for mapping addresses to which virtual address we mapped them to. */
659 char *hostname_address
;
660 } virtaddress_entry_t
;
662 /** A hash table to store client-side address rewrite instructions. */
663 static strmap_t
*addressmap
=NULL
;
665 * Table mapping addresses to which virtual address, if any, we
668 * We maintain the following invariant: if [A,B] is in
669 * virtaddress_reversemap, then B must be a virtual address, and [A,B]
670 * must be in addressmap. We do not require that the converse hold:
671 * if it fails, then we could end up mapping two virtual addresses to
672 * the same address, which is no disaster.
674 static strmap_t
*virtaddress_reversemap
=NULL
;
676 /** Initialize addressmap. */
678 addressmap_init(void)
680 addressmap
= strmap_new();
681 virtaddress_reversemap
= strmap_new();
684 /** Free the memory associated with the addressmap entry <b>_ent</b>. */
686 addressmap_ent_free(void *_ent
)
688 addressmap_entry_t
*ent
= _ent
;
689 tor_free(ent
->new_address
);
693 /** Free storage held by a virtaddress_entry_t* entry in <b>ent</b>. */
695 addressmap_virtaddress_ent_free(void *_ent
)
697 virtaddress_entry_t
*ent
= _ent
;
698 tor_free(ent
->ipv4_address
);
699 tor_free(ent
->hostname_address
);
703 /** Free storage held by a virtaddress_entry_t* entry in <b>ent</b>. */
705 addressmap_virtaddress_remove(const char *address
, addressmap_entry_t
*ent
)
707 if (ent
&& ent
->new_address
&&
708 address_is_in_virtual_range(ent
->new_address
)) {
709 virtaddress_entry_t
*ve
=
710 strmap_get(virtaddress_reversemap
, ent
->new_address
);
711 /*log_fn(LOG_NOTICE,"remove reverse mapping for %s",ent->new_address);*/
713 if (!strcmp(address
, ve
->ipv4_address
))
714 tor_free(ve
->ipv4_address
);
715 if (!strcmp(address
, ve
->hostname_address
))
716 tor_free(ve
->hostname_address
);
717 if (!ve
->ipv4_address
&& !ve
->hostname_address
) {
719 strmap_remove(virtaddress_reversemap
, ent
->new_address
);
725 /** Remove <b>ent</b> (which must be mapped to by <b>address</b>) from the
726 * client address maps. */
728 addressmap_ent_remove(const char *address
, addressmap_entry_t
*ent
)
730 addressmap_virtaddress_remove(address
, ent
);
731 addressmap_ent_free(ent
);
734 /** Unregister all TrackHostExits mappings from any address to
735 * *.exitname.exit. */
737 clear_trackexithost_mappings(const char *exitname
)
741 if (!addressmap
|| !exitname
)
743 suffix_len
= strlen(exitname
) + 16;
744 suffix
= tor_malloc(suffix_len
);
745 tor_snprintf(suffix
, suffix_len
, ".%s.exit", exitname
);
746 tor_strlower(suffix
);
748 STRMAP_FOREACH_MODIFY(addressmap
, address
, addressmap_entry_t
*, ent
) {
749 if (ent
->source
== ADDRMAPSRC_TRACKEXIT
&& !strcmpend(address
, suffix
)) {
750 addressmap_ent_remove(address
, ent
);
751 MAP_DEL_CURRENT(address
);
753 } STRMAP_FOREACH_END
;
758 /** Remove all entries from the addressmap that were set via the
759 * configuration file or the command line. */
761 addressmap_clear_configured(void)
763 addressmap_get_mappings(NULL
, 0, 0, 0);
766 /** Remove all entries from the addressmap that are set to expire, ever. */
768 addressmap_clear_transient(void)
770 addressmap_get_mappings(NULL
, 2, TIME_MAX
, 0);
773 /** Clean out entries from the addressmap cache that were
774 * added long enough ago that they are no longer valid.
777 addressmap_clean(time_t now
)
779 addressmap_get_mappings(NULL
, 2, now
, 0);
782 /** Free all the elements in the addressmap, and free the addressmap
785 addressmap_free_all(void)
788 strmap_free(addressmap
, addressmap_ent_free
);
791 if (virtaddress_reversemap
) {
792 strmap_free(virtaddress_reversemap
, addressmap_virtaddress_ent_free
);
793 virtaddress_reversemap
= NULL
;
797 /** Look at address, and rewrite it until it doesn't want any
798 * more rewrites; but don't get into an infinite loop.
799 * Don't write more than maxlen chars into address. Return true if the
800 * address changed; false otherwise. Set *<b>expires_out</b> to the
801 * expiry time of the result, or to <b>time_max</b> if the result does
805 addressmap_rewrite(char *address
, size_t maxlen
, time_t *expires_out
)
807 addressmap_entry_t
*ent
;
810 time_t expires
= TIME_MAX
;
812 for (rewrites
= 0; rewrites
< 16; rewrites
++) {
813 ent
= strmap_get(addressmap
, address
);
815 if (!ent
|| !ent
->new_address
) {
817 *expires_out
= expires
;
818 return (rewrites
> 0); /* done, no rewrite needed */
821 cp
= tor_strdup(escaped_safe_str(ent
->new_address
));
822 log_info(LD_APP
, "Addressmap: rewriting %s to %s",
823 escaped_safe_str(address
), cp
);
824 if (ent
->expires
> 1 && ent
->expires
< expires
)
825 expires
= ent
->expires
;
827 strlcpy(address
, ent
->new_address
, maxlen
);
830 "Loop detected: we've rewritten %s 16 times! Using it as-is.",
831 escaped_safe_str(address
));
832 /* it's fine to rewrite a rewrite, but don't loop forever */
834 *expires_out
= TIME_MAX
;
838 /** If we have a cached reverse DNS entry for the address stored in the
839 * <b>maxlen</b>-byte buffer <b>address</b> (typically, a dotted quad) then
840 * rewrite to the cached value and return 1. Otherwise return 0. Set
841 * *<b>expires_out</b> to the expiry time of the result, or to <b>time_max</b>
842 * if the result does not expire. */
844 addressmap_rewrite_reverse(char *address
, size_t maxlen
, time_t *expires_out
)
846 size_t len
= maxlen
+ 16;
847 char *s
= tor_malloc(len
), *cp
;
848 addressmap_entry_t
*ent
;
850 tor_snprintf(s
, len
, "REVERSE[%s]", address
);
851 ent
= strmap_get(addressmap
, s
);
853 cp
= tor_strdup(escaped_safe_str(ent
->new_address
));
854 log_info(LD_APP
, "Rewrote reverse lookup %s -> %s",
855 escaped_safe_str(s
), cp
);
857 strlcpy(address
, ent
->new_address
, maxlen
);
862 *expires_out
= (ent
&& ent
->expires
> 1) ? ent
->expires
: TIME_MAX
;
868 /** Return 1 if <b>address</b> is already registered, else return 0. If address
869 * is already registered, and <b>update_expires</b> is non-zero, then update
870 * the expiry time on the mapping with update_expires if it is a
871 * mapping created by TrackHostExits. */
873 addressmap_have_mapping(const char *address
, int update_expiry
)
875 addressmap_entry_t
*ent
;
876 if (!(ent
=strmap_get_lc(addressmap
, address
)))
878 if (update_expiry
&& ent
->source
==ADDRMAPSRC_TRACKEXIT
)
879 ent
->expires
=time(NULL
) + update_expiry
;
883 /** Register a request to map <b>address</b> to <b>new_address</b>,
884 * which will expire on <b>expires</b> (or 0 if never expires from
885 * config file, 1 if never expires from controller, 2 if never expires
886 * (virtual address mapping) from the controller.)
888 * <b>new_address</b> should be a newly dup'ed string, which we'll use or
889 * free as appropriate. We will leave address alone.
891 * If <b>new_address</b> is NULL, or equal to <b>address</b>, remove
892 * any mappings that exist from <b>address</b>.
895 addressmap_register(const char *address
, char *new_address
, time_t expires
,
896 addressmap_entry_source_t source
)
898 addressmap_entry_t
*ent
;
900 ent
= strmap_get(addressmap
, address
);
901 if (!new_address
|| !strcasecmp(address
,new_address
)) {
902 /* Remove the mapping, if any. */
903 tor_free(new_address
);
905 addressmap_ent_remove(address
,ent
);
906 strmap_remove(addressmap
, address
);
910 if (!ent
) { /* make a new one and register it */
911 ent
= tor_malloc_zero(sizeof(addressmap_entry_t
));
912 strmap_set(addressmap
, address
, ent
);
913 } else if (ent
->new_address
) { /* we need to clean up the old mapping. */
915 log_info(LD_APP
,"Temporary addressmap ('%s' to '%s') not performed, "
916 "since it's already mapped to '%s'",
917 safe_str(address
), safe_str(new_address
), safe_str(ent
->new_address
));
918 tor_free(new_address
);
921 if (address_is_in_virtual_range(ent
->new_address
) &&
923 /* XXX This isn't the perfect test; we want to avoid removing
924 * mappings set from the control interface _as virtual mapping */
925 addressmap_virtaddress_remove(address
, ent
);
927 tor_free(ent
->new_address
);
928 } /* else { we have an in-progress resolve with no mapping. } */
930 ent
->new_address
= new_address
;
931 ent
->expires
= expires
==2 ? 1 : expires
;
932 ent
->num_resolve_failures
= 0;
933 ent
->source
= source
;
935 log_info(LD_CONFIG
, "Addressmap: (re)mapped '%s' to '%s'",
936 safe_str(address
), safe_str(ent
->new_address
));
937 control_event_address_mapped(address
, ent
->new_address
, expires
, NULL
);
940 /** An attempt to resolve <b>address</b> failed at some OR.
941 * Increment the number of resolve failures we have on record
942 * for it, and then return that number.
945 client_dns_incr_failures(const char *address
)
947 addressmap_entry_t
*ent
= strmap_get(addressmap
, address
);
949 ent
= tor_malloc_zero(sizeof(addressmap_entry_t
));
950 ent
->expires
= time(NULL
) + MAX_DNS_ENTRY_AGE
;
951 strmap_set(addressmap
,address
,ent
);
953 if (ent
->num_resolve_failures
< SHORT_MAX
)
954 ++ent
->num_resolve_failures
; /* don't overflow */
955 log_info(LD_APP
, "Address %s now has %d resolve failures.",
956 safe_str(address
), ent
->num_resolve_failures
);
957 return ent
->num_resolve_failures
;
960 /** If <b>address</b> is in the client DNS addressmap, reset
961 * the number of resolve failures we have on record for it.
962 * This is used when we fail a stream because it won't resolve:
963 * otherwise future attempts on that address will only try once.
966 client_dns_clear_failures(const char *address
)
968 addressmap_entry_t
*ent
= strmap_get(addressmap
, address
);
970 ent
->num_resolve_failures
= 0;
973 /** Record the fact that <b>address</b> resolved to <b>name</b>.
974 * We can now use this in subsequent streams via addressmap_rewrite()
975 * so we can more correctly choose an exit that will allow <b>address</b>.
977 * If <b>exitname</b> is defined, then append the addresses with
978 * ".exitname.exit" before registering the mapping.
980 * If <b>ttl</b> is nonnegative, the mapping will be valid for
981 * <b>ttl</b>seconds; otherwise, we use the default.
984 client_dns_set_addressmap_impl(const char *address
, const char *name
,
985 const char *exitname
,
988 /* <address>.<hex or nickname>.exit\0 or just <address>\0 */
989 char extendedaddress
[MAX_SOCKS_ADDR_LEN
+MAX_VERBOSE_NICKNAME_LEN
+10];
990 /* 123.123.123.123.<hex or nickname>.exit\0 or just 123.123.123.123\0 */
991 char extendedval
[INET_NTOA_BUF_LEN
+MAX_VERBOSE_NICKNAME_LEN
+10];
997 ttl
= DEFAULT_DNS_TTL
;
999 ttl
= dns_clip_ttl(ttl
);
1002 /* XXXX fails to ever get attempts to get an exit address of
1003 * google.com.digest[=~]nickname.exit; we need a syntax for this that
1004 * won't make strict RFC952-compliant applications (like us) barf. */
1005 tor_snprintf(extendedaddress
, sizeof(extendedaddress
),
1006 "%s.%s.exit", address
, exitname
);
1007 tor_snprintf(extendedval
, sizeof(extendedval
),
1008 "%s.%s.exit", name
, exitname
);
1010 tor_snprintf(extendedaddress
, sizeof(extendedaddress
),
1012 tor_snprintf(extendedval
, sizeof(extendedval
),
1015 addressmap_register(extendedaddress
, tor_strdup(extendedval
),
1016 time(NULL
) + ttl
, ADDRMAPSRC_DNS
);
1019 /** Record the fact that <b>address</b> resolved to <b>val</b>.
1020 * We can now use this in subsequent streams via addressmap_rewrite()
1021 * so we can more correctly choose an exit that will allow <b>address</b>.
1023 * If <b>exitname</b> is defined, then append the addresses with
1024 * ".exitname.exit" before registering the mapping.
1026 * If <b>ttl</b> is nonnegative, the mapping will be valid for
1027 * <b>ttl</b>seconds; otherwise, we use the default.
1030 client_dns_set_addressmap(const char *address
, uint32_t val
,
1031 const char *exitname
,
1035 char valbuf
[INET_NTOA_BUF_LEN
];
1037 tor_assert(address
);
1039 if (tor_inet_aton(address
, &in
))
1040 return; /* If address was an IP address already, don't add a mapping. */
1041 in
.s_addr
= htonl(val
);
1042 tor_inet_ntoa(&in
,valbuf
,sizeof(valbuf
));
1044 client_dns_set_addressmap_impl(address
, valbuf
, exitname
, ttl
);
1047 /** Add a cache entry noting that <b>address</b> (ordinarily a dotted quad)
1048 * resolved via a RESOLVE_PTR request to the hostname <b>v</b>.
1050 * If <b>exitname</b> is defined, then append the addresses with
1051 * ".exitname.exit" before registering the mapping.
1053 * If <b>ttl</b> is nonnegative, the mapping will be valid for
1054 * <b>ttl</b>seconds; otherwise, we use the default.
1057 client_dns_set_reverse_addressmap(const char *address
, const char *v
,
1058 const char *exitname
,
1061 size_t len
= strlen(address
) + 16;
1062 char *s
= tor_malloc(len
);
1063 tor_snprintf(s
, len
, "REVERSE[%s]", address
);
1064 client_dns_set_addressmap_impl(s
, v
, exitname
, ttl
);
1068 /* By default, we hand out 127.192.0.1 through 127.254.254.254.
1069 * These addresses should map to localhost, so even if the
1070 * application accidentally tried to connect to them directly (not
1071 * via Tor), it wouldn't get too far astray.
1073 * These options are configured by parse_virtual_addr_network().
1075 /** Which network should we use for virtual IPv4 addresses? Only the first
1076 * bits of this value are fixed. */
1077 static uint32_t virtual_addr_network
= 0x7fc00000u
;
1078 /** How many bits of <b>virtual_addr_network</b> are fixed? */
1079 static maskbits_t virtual_addr_netmask_bits
= 10;
1080 /** What's the next virtual address we will hand out? */
1081 static uint32_t next_virtual_addr
= 0x7fc00000u
;
1083 /** Read a netmask of the form 127.192.0.0/10 from "val", and check whether
1084 * it's a valid set of virtual addresses to hand out in response to MAPADDRESS
1085 * requests. Return 0 on success; set *msg (if provided) to a newly allocated
1086 * string and return -1 on failure. If validate_only is false, sets the
1087 * actual virtual address range to the parsed value. */
1089 parse_virtual_addr_network(const char *val
, int validate_only
,
1093 uint16_t port_min
, port_max
;
1096 if (parse_addr_and_port_range(val
, &addr
, &bits
, &port_min
, &port_max
)) {
1097 if (msg
) *msg
= tor_strdup("Error parsing VirtualAddressNetwork");
1101 if (port_min
!= 1 || port_max
!= 65535) {
1102 if (msg
) *msg
= tor_strdup("Can't specify ports on VirtualAddressNetwork");
1107 if (msg
) *msg
= tor_strdup("VirtualAddressNetwork expects a /16 "
1108 "network or larger");
1115 virtual_addr_network
= (uint32_t)( addr
& (0xfffffffful
<< (32-bits
)) );
1116 virtual_addr_netmask_bits
= bits
;
1118 if (addr_mask_cmp_bits(next_virtual_addr
, addr
, bits
))
1119 next_virtual_addr
= addr
;
1125 * Return true iff <b>addr</b> is likely to have been returned by
1126 * client_dns_get_unused_address.
1129 address_is_in_virtual_range(const char *address
)
1132 tor_assert(address
);
1133 if (!strcasecmpend(address
, ".virtual")) {
1135 } else if (tor_inet_aton(address
, &in
)) {
1136 uint32_t addr
= ntohl(in
.s_addr
);
1137 if (!addr_mask_cmp_bits(addr
, virtual_addr_network
,
1138 virtual_addr_netmask_bits
))
1144 /** Return a newly allocated string holding an address of <b>type</b>
1145 * (one of RESOLVED_TYPE_{IPV4|HOSTNAME}) that has not yet been mapped,
1146 * and that is very unlikely to be the address of any real host.
1149 addressmap_get_virtual_address(int type
)
1153 tor_assert(addressmap
);
1155 if (type
== RESOLVED_TYPE_HOSTNAME
) {
1158 crypto_rand(rand
, sizeof(rand
));
1159 base32_encode(buf
,sizeof(buf
),rand
,sizeof(rand
));
1160 strlcat(buf
, ".virtual", sizeof(buf
));
1161 } while (strmap_get(addressmap
, buf
));
1162 return tor_strdup(buf
);
1163 } else if (type
== RESOLVED_TYPE_IPV4
) {
1164 // This is an imperfect estimate of how many addresses are available, but
1166 uint32_t available
= 1u << (32-virtual_addr_netmask_bits
);
1168 /* Don't hand out any .0 or .255 address. */
1169 while ((next_virtual_addr
& 0xff) == 0 ||
1170 (next_virtual_addr
& 0xff) == 0xff) {
1171 ++next_virtual_addr
;
1173 in
.s_addr
= htonl(next_virtual_addr
);
1174 tor_inet_ntoa(&in
, buf
, sizeof(buf
));
1175 if (!strmap_get(addressmap
, buf
)) {
1176 ++next_virtual_addr
;
1180 ++next_virtual_addr
;
1182 log_info(LD_CONFIG
, "%d addrs available", (int)available
);
1183 if (! --available
) {
1184 log_warn(LD_CONFIG
, "Ran out of virtual addresses!");
1187 if (addr_mask_cmp_bits(next_virtual_addr
, virtual_addr_network
,
1188 virtual_addr_netmask_bits
))
1189 next_virtual_addr
= virtual_addr_network
;
1191 return tor_strdup(buf
);
1193 log_warn(LD_BUG
, "Called with unsupported address type (%d)", type
);
1198 /** A controller has requested that we map some address of type
1199 * <b>type</b> to the address <b>new_address</b>. Choose an address
1200 * that is unlikely to be used, and map it, and return it in a newly
1201 * allocated string. If another address of the same type is already
1202 * mapped to <b>new_address</b>, try to return a copy of that address.
1204 * The string in <b>new_address</b> may be freed, or inserted into a map
1208 addressmap_register_virtual_address(int type
, char *new_address
)
1211 virtaddress_entry_t
*vent
;
1213 tor_assert(new_address
);
1214 tor_assert(addressmap
);
1215 tor_assert(virtaddress_reversemap
);
1217 vent
= strmap_get(virtaddress_reversemap
, new_address
);
1219 vent
= tor_malloc_zero(sizeof(virtaddress_entry_t
));
1220 strmap_set(virtaddress_reversemap
, new_address
, vent
);
1223 addrp
= (type
== RESOLVED_TYPE_IPV4
) ?
1224 &vent
->ipv4_address
: &vent
->hostname_address
;
1226 addressmap_entry_t
*ent
= strmap_get(addressmap
, *addrp
);
1227 if (ent
&& ent
->new_address
&&
1228 !strcasecmp(new_address
, ent
->new_address
)) {
1229 tor_free(new_address
);
1230 return tor_strdup(*addrp
);
1233 "Internal confusion: I thought that '%s' was mapped to by "
1234 "'%s', but '%s' really maps to '%s'. This is a harmless bug.",
1235 safe_str(new_address
), safe_str(*addrp
), safe_str(*addrp
),
1236 ent
?safe_str(ent
->new_address
):"(nothing)");
1240 *addrp
= addressmap_get_virtual_address(type
);
1241 log_info(LD_APP
, "Registering map from %s to %s", *addrp
, new_address
);
1242 addressmap_register(*addrp
, new_address
, 2, ADDRMAPSRC_CONTROLLER
);
1246 /* Try to catch possible bugs */
1247 addressmap_entry_t
*ent
;
1248 ent
= strmap_get(addressmap
, *addrp
);
1250 tor_assert(!strcasecmp(ent
->new_address
,new_address
));
1251 vent
= strmap_get(virtaddress_reversemap
, new_address
);
1253 tor_assert(!strcasecmp(*addrp
,
1254 (type
== RESOLVED_TYPE_IPV4
) ?
1255 vent
->ipv4_address
: vent
->hostname_address
));
1256 log_info(LD_APP
, "Map from %s to %s okay.",
1257 safe_str(*addrp
),safe_str(new_address
));
1264 /** Return 1 if <b>address</b> has funny characters in it like colons. Return
1265 * 0 if it's fine, or if we're configured to allow it anyway. <b>client</b>
1266 * should be true if we're using this address as a client; false if we're
1267 * using it as a server.
1270 address_is_invalid_destination(const char *address
, int client
)
1273 if (get_options()->AllowNonRFC953Hostnames
)
1276 if (get_options()->ServerDNSAllowNonRFC953Hostnames
)
1281 if (TOR_ISALNUM(*address
) ||
1284 *address
== '_') /* Underscore is not allowed, but Windows does it
1285 * sometimes, just to thumb its nose at the IETF. */
1293 /** Iterate over all address mappings which have expiry times between
1294 * min_expires and max_expires, inclusive. If sl is provided, add an
1295 * "old-addr new-addr expiry" string to sl for each mapping, omitting
1296 * the expiry time if want_expiry is false. If sl is NULL, remove the
1300 addressmap_get_mappings(smartlist_t
*sl
, time_t min_expires
,
1301 time_t max_expires
, int want_expiry
)
1303 strmap_iter_t
*iter
;
1306 addressmap_entry_t
*val
;
1311 for (iter
= strmap_iter_init(addressmap
); !strmap_iter_done(iter
); ) {
1312 strmap_iter_get(iter
, &key
, &_val
);
1314 if (val
->expires
>= min_expires
&& val
->expires
<= max_expires
) {
1316 iter
= strmap_iter_next_rmv(addressmap
,iter
);
1317 addressmap_ent_remove(key
, val
);
1319 } else if (val
->new_address
) {
1320 size_t len
= strlen(key
)+strlen(val
->new_address
)+ISO_TIME_LEN
+5;
1321 char *line
= tor_malloc(len
);
1323 if (val
->expires
< 3 || val
->expires
== TIME_MAX
)
1324 tor_snprintf(line
, len
, "%s %s NEVER", key
, val
->new_address
);
1326 char time
[ISO_TIME_LEN
+1];
1327 format_iso_time(time
, val
->expires
);
1328 tor_snprintf(line
, len
, "%s %s \"%s\"", key
, val
->new_address
,
1332 tor_snprintf(line
, len
, "%s %s", key
, val
->new_address
);
1334 smartlist_add(sl
, line
);
1337 iter
= strmap_iter_next(addressmap
,iter
);
1341 /** Check if <b>conn</b> is using a dangerous port. Then warn and/or
1342 * reject depending on our config options. */
1344 consider_plaintext_ports(edge_connection_t
*conn
, uint16_t port
)
1346 or_options_t
*options
= get_options();
1347 int reject
= smartlist_string_num_isin(options
->RejectPlaintextPorts
, port
);
1349 if (smartlist_string_num_isin(options
->WarnPlaintextPorts
, port
)) {
1350 log_warn(LD_APP
, "Application request to port %d: this port is "
1351 "commonly used for unencrypted protocols. Please make sure "
1352 "you don't send anything you would mind the rest of the "
1353 "Internet reading!%s", port
, reject
? " Closing." : "");
1354 control_event_client_status(LOG_WARN
, "DANGEROUS_PORT PORT=%d RESULT=%s",
1355 port
, reject
? "REJECT" : "WARN");
1359 log_info(LD_APP
, "Port %d listed in RejectPlaintextPorts. Closing.", port
);
1360 connection_mark_unattached_ap(conn
, END_STREAM_REASON_ENTRYPOLICY
);
1367 /** How many times do we try connecting with an exit configured via
1368 * TrackHostExits before concluding that it won't work any more and trying a
1370 #define TRACKHOSTEXITS_RETRIES 5
1372 /** Connection <b>conn</b> just finished its socks handshake, or the
1373 * controller asked us to take care of it. If <b>circ</b> is defined,
1374 * then that's where we'll want to attach it. Otherwise we have to
1375 * figure it out ourselves.
1377 * First, parse whether it's a .exit address, remap it, and so on. Then
1378 * if it's for a general circuit, try to attach it to a circuit (or launch
1379 * one as needed), else if it's for a rendezvous circuit, fetch a
1380 * rendezvous descriptor first (or attach/launch a circuit if the
1381 * rendezvous descriptor is already here and fresh enough).
1383 * The stream will exit from the hop
1384 * indicated by <b>cpath</b>, or from the last hop in circ's cpath if
1385 * <b>cpath</b> is NULL.
1388 connection_ap_handshake_rewrite_and_attach(edge_connection_t
*conn
,
1389 origin_circuit_t
*circ
,
1390 crypt_path_t
*cpath
)
1392 socks_request_t
*socks
= conn
->socks_request
;
1393 hostname_type_t addresstype
;
1394 or_options_t
*options
= get_options();
1395 struct in_addr addr_tmp
;
1397 char orig_address
[MAX_SOCKS_ADDR_LEN
];
1398 time_t map_expires
= TIME_MAX
;
1399 int remapped_to_exit
= 0;
1400 time_t now
= time(NULL
);
1402 tor_strlower(socks
->address
); /* normalize it */
1403 strlcpy(orig_address
, socks
->address
, sizeof(orig_address
));
1404 log_debug(LD_APP
,"Client asked for %s:%d",
1405 safe_str(socks
->address
),
1408 if (socks
->command
== SOCKS_COMMAND_RESOLVE
&&
1409 !tor_inet_aton(socks
->address
, &addr_tmp
) &&
1410 options
->AutomapHostsOnResolve
&& options
->AutomapHostsSuffixes
) {
1411 SMARTLIST_FOREACH(options
->AutomapHostsSuffixes
, const char *, cp
,
1412 if (!strcasecmpend(socks
->address
, cp
)) {
1417 const char *new_addr
;
1418 new_addr
= addressmap_register_virtual_address(
1419 RESOLVED_TYPE_IPV4
, tor_strdup(socks
->address
));
1420 tor_assert(new_addr
);
1421 log_info(LD_APP
, "Automapping %s to %s",
1422 escaped_safe_str(socks
->address
), safe_str(new_addr
));
1423 strlcpy(socks
->address
, new_addr
, sizeof(socks
->address
));
1427 if (socks
->command
== SOCKS_COMMAND_RESOLVE_PTR
) {
1428 if (addressmap_rewrite_reverse(socks
->address
, sizeof(socks
->address
),
1430 char *result
= tor_strdup(socks
->address
);
1431 /* remember _what_ is supposed to have been resolved. */
1432 tor_snprintf(socks
->address
, sizeof(socks
->address
), "REVERSE[%s]",
1434 connection_ap_handshake_socks_resolved(conn
, RESOLVED_TYPE_HOSTNAME
,
1435 strlen(result
), result
, -1,
1437 connection_mark_unattached_ap(conn
,
1438 END_STREAM_REASON_DONE
|
1439 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1442 if (options
->ClientDNSRejectInternalAddresses
) {
1443 /* Don't let people try to do a reverse lookup on 10.0.0.1. */
1446 ok
= tor_addr_parse_reverse_lookup_name(
1447 &addr
, socks
->address
, AF_UNSPEC
, 1);
1448 if (ok
== 1 && tor_addr_is_internal(&addr
, 0)) {
1449 connection_ap_handshake_socks_resolved(conn
, RESOLVED_TYPE_ERROR
,
1450 0, NULL
, -1, TIME_MAX
);
1451 connection_mark_unattached_ap(conn
,
1452 END_STREAM_REASON_SOCKSPROTOCOL
|
1453 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1457 } else if (!automap
) {
1458 int started_without_chosen_exit
= strcasecmpend(socks
->address
, ".exit");
1459 /* For address map controls, remap the address. */
1460 if (addressmap_rewrite(socks
->address
, sizeof(socks
->address
),
1462 control_event_stream_status(conn
, STREAM_EVENT_REMAP
,
1463 REMAP_STREAM_SOURCE_CACHE
);
1464 if (started_without_chosen_exit
&&
1465 !strcasecmpend(socks
->address
, ".exit") &&
1466 map_expires
< TIME_MAX
)
1467 remapped_to_exit
= 1;
1471 if (!automap
&& address_is_in_virtual_range(socks
->address
)) {
1472 /* This address was probably handed out by client_dns_get_unmapped_address,
1473 * but the mapping was discarded for some reason. We *don't* want to send
1474 * the address through Tor; that's likely to fail, and may leak
1477 log_warn(LD_APP
,"Missing mapping for virtual address '%s'. Refusing.",
1478 socks
->address
); /* don't safe_str() this yet. */
1479 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INTERNAL
);
1483 /* Parse the address provided by SOCKS. Modify it in-place if it
1484 * specifies a hidden-service (.onion) or particular exit node (.exit).
1486 addresstype
= parse_extended_hostname(socks
->address
,
1487 remapped_to_exit
|| options
->AllowDotExit
);
1489 if (addresstype
== BAD_HOSTNAME
) {
1490 log_warn(LD_APP
, "Invalid onion hostname %s; rejecting",
1491 safe_str(socks
->address
));
1492 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1493 escaped(socks
->address
));
1494 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1498 if (addresstype
== EXIT_HOSTNAME
) {
1499 /* foo.exit -- modify conn->chosen_exit_node to specify the exit
1500 * node, and conn->address to hold only the address portion. */
1501 char *s
= strrchr(socks
->address
,'.');
1502 tor_assert(!automap
);
1505 conn
->chosen_exit_name
= tor_strdup(s
+1);
1506 if (remapped_to_exit
) /* 5 tries before it expires the addressmap */
1507 conn
->chosen_exit_retries
= TRACKHOSTEXITS_RETRIES
;
1510 log_warn(LD_APP
,"Malformed exit address '%s.exit'. Refusing.",
1511 safe_str(socks
->address
));
1512 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1513 escaped(socks
->address
));
1514 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1519 conn
->chosen_exit_name
= tor_strdup(socks
->address
);
1520 r
= router_get_by_nickname(conn
->chosen_exit_name
, 1);
1521 *socks
->address
= 0;
1523 strlcpy(socks
->address
, r
->address
, sizeof(socks
->address
));
1526 "Unrecognized server in exit address '%s.exit'. Refusing.",
1527 safe_str(socks
->address
));
1528 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1534 if (addresstype
!= ONION_HOSTNAME
) {
1535 /* not a hidden-service request (i.e. normal or .exit) */
1536 if (address_is_invalid_destination(socks
->address
, 1)) {
1537 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1538 escaped(socks
->address
));
1540 "Destination '%s' seems to be an invalid hostname. Failing.",
1541 safe_str(socks
->address
));
1542 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1546 if (socks
->command
== SOCKS_COMMAND_RESOLVE
) {
1549 /* Reply to resolves immediately if we can. */
1550 if (strlen(socks
->address
) > RELAY_PAYLOAD_SIZE
) {
1551 log_warn(LD_APP
,"Address to be resolved is too large. Failing.");
1552 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1553 escaped(socks
->address
));
1554 connection_ap_handshake_socks_resolved(conn
,
1555 RESOLVED_TYPE_ERROR_TRANSIENT
,
1556 0,NULL
,-1,TIME_MAX
);
1557 connection_mark_unattached_ap(conn
,
1558 END_STREAM_REASON_SOCKSPROTOCOL
|
1559 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1562 if (tor_inet_aton(socks
->address
, &in
)) { /* see if it's an IP already */
1563 /* leave it in network order */
1565 /* remember _what_ is supposed to have been resolved. */
1566 strlcpy(socks
->address
, orig_address
, sizeof(socks
->address
));
1567 connection_ap_handshake_socks_resolved(conn
,RESOLVED_TYPE_IPV4
,4,
1568 (char*)&answer
,-1,map_expires
);
1569 connection_mark_unattached_ap(conn
,
1570 END_STREAM_REASON_DONE
|
1571 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1574 tor_assert(!automap
);
1575 rep_hist_note_used_resolve(now
); /* help predict this next time */
1576 } else if (socks
->command
== SOCKS_COMMAND_CONNECT
) {
1577 tor_assert(!automap
);
1578 if (socks
->port
== 0) {
1579 log_notice(LD_APP
,"Application asked to connect to port 0. Refusing.");
1580 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1584 if (!conn
->use_begindir
&& !conn
->chosen_exit_name
&& !circ
) {
1585 /* see if we can find a suitable enclave exit */
1587 router_find_exact_exit_enclave(socks
->address
, socks
->port
);
1590 "Redirecting address %s to exit at enclave router %s",
1591 safe_str(socks
->address
), r
->nickname
);
1592 /* use the hex digest, not nickname, in case there are two
1593 routers with this nickname */
1594 conn
->chosen_exit_name
=
1595 tor_strdup(hex_str(r
->cache_info
.identity_digest
, DIGEST_LEN
));
1596 conn
->chosen_exit_optional
= 1;
1600 /* warn or reject if it's using a dangerous port */
1601 if (!conn
->use_begindir
&& !conn
->chosen_exit_name
&& !circ
)
1602 if (consider_plaintext_ports(conn
, socks
->port
) < 0)
1605 if (!conn
->use_begindir
) {
1606 /* help predict this next time */
1607 rep_hist_note_used_port(now
, socks
->port
);
1609 } else if (socks
->command
== SOCKS_COMMAND_RESOLVE_PTR
) {
1610 rep_hist_note_used_resolve(now
); /* help predict this next time */
1611 /* no extra processing needed */
1613 tor_fragile_assert();
1615 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1616 if ((circ
&& connection_ap_handshake_attach_chosen_circuit(
1617 conn
, circ
, cpath
) < 0) ||
1619 connection_ap_handshake_attach_circuit(conn
) < 0)) {
1620 if (!conn
->_base
.marked_for_close
)
1621 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
1626 /* it's a hidden-service request */
1627 rend_cache_entry_t
*entry
;
1629 rend_service_authorization_t
*client_auth
;
1630 tor_assert(!automap
);
1631 if (SOCKS_COMMAND_IS_RESOLVE(socks
->command
)) {
1632 /* if it's a resolve request, fail it right now, rather than
1633 * building all the circuits and then realizing it won't work. */
1635 "Resolve requests to hidden services not allowed. Failing.");
1636 connection_ap_handshake_socks_resolved(conn
,RESOLVED_TYPE_ERROR
,
1637 0,NULL
,-1,TIME_MAX
);
1638 connection_mark_unattached_ap(conn
,
1639 END_STREAM_REASON_SOCKSPROTOCOL
|
1640 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1645 log_warn(LD_CONTROL
, "Attachstream to a circuit is not "
1646 "supported for .onion addresses currently. Failing.");
1647 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1651 conn
->rend_data
= tor_malloc_zero(sizeof(rend_data_t
));
1652 strlcpy(conn
->rend_data
->onion_address
, socks
->address
,
1653 sizeof(conn
->rend_data
->onion_address
));
1654 log_info(LD_REND
,"Got a hidden service request for ID '%s'",
1655 safe_str(conn
->rend_data
->onion_address
));
1656 /* see if we already have it cached */
1657 r
= rend_cache_lookup_entry(conn
->rend_data
->onion_address
, -1, &entry
);
1659 log_warn(LD_BUG
,"Invalid service name '%s'",
1660 safe_str(conn
->rend_data
->onion_address
));
1661 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1665 /* Help predict this next time. We're not sure if it will need
1666 * a stable circuit yet, but we know we'll need *something*. */
1667 rep_hist_note_used_internal(now
, 0, 1);
1669 /* Look up if we have client authorization for it. */
1670 client_auth
= rend_client_lookup_service_authorization(
1671 conn
->rend_data
->onion_address
);
1673 log_info(LD_REND
, "Using previously configured client authorization "
1674 "for hidden service request.");
1675 memcpy(conn
->rend_data
->descriptor_cookie
,
1676 client_auth
->descriptor_cookie
, REND_DESC_COOKIE_LEN
);
1677 conn
->rend_data
->auth_type
= client_auth
->auth_type
;
1680 conn
->_base
.state
= AP_CONN_STATE_RENDDESC_WAIT
;
1681 log_info(LD_REND
, "Unknown descriptor %s. Fetching.",
1682 safe_str(conn
->rend_data
->onion_address
));
1683 rend_client_refetch_v2_renddesc(conn
->rend_data
);
1684 } else { /* r > 0 */
1685 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1686 log_info(LD_REND
, "Descriptor is here. Great.");
1687 if (connection_ap_handshake_attach_circuit(conn
) < 0) {
1688 if (!conn
->_base
.marked_for_close
)
1689 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
1695 return 0; /* unreached but keeps the compiler happy */
1699 static int pf_socket
= -1;
1704 /* This should be opened before dropping privileges. */
1709 /* only works on OpenBSD */
1710 pf
= open("/dev/pf", O_RDONLY
);
1712 /* works on NetBSD and FreeBSD */
1713 pf
= open("/dev/pf", O_RDWR
);
1717 log_warn(LD_NET
, "open(\"/dev/pf\") failed: %s", strerror(errno
));
1726 /** Fetch the original destination address and port from a
1727 * system-specific interface and put them into a
1728 * socks_request_t as if they came from a socks request.
1730 * Return -1 if an error prevents fetching the destination,
1734 connection_ap_get_original_destination(edge_connection_t
*conn
,
1735 socks_request_t
*req
)
1737 #ifdef TRANS_NETFILTER
1739 struct sockaddr_storage orig_dst
;
1740 socklen_t orig_dst_len
= sizeof(orig_dst
);
1743 if (getsockopt(conn
->_base
.s
, SOL_IP
, SO_ORIGINAL_DST
,
1744 (struct sockaddr
*)&orig_dst
, &orig_dst_len
) < 0) {
1745 int e
= tor_socket_errno(conn
->_base
.s
);
1746 log_warn(LD_NET
, "getsockopt() failed: %s", tor_socket_strerror(e
));
1750 tor_addr_from_sockaddr(&addr
, (struct sockaddr
*)&orig_dst
, &req
->port
);
1751 tor_addr_to_str(req
->address
, &addr
, sizeof(req
->address
), 0);
1754 #elif defined(TRANS_PF)
1755 struct sockaddr_storage proxy_addr
;
1756 socklen_t proxy_addr_len
= sizeof(proxy_addr
);
1757 struct sockaddr
*proxy_sa
= (struct sockaddr
*) &proxy_addr
;
1758 struct pfioc_natlook pnl
;
1762 if (getsockname(conn
->_base
.s
, (struct sockaddr
*)&proxy_addr
,
1763 &proxy_addr_len
) < 0) {
1764 int e
= tor_socket_errno(conn
->_base
.s
);
1765 log_warn(LD_NET
, "getsockname() to determine transocks destination "
1766 "failed: %s", tor_socket_strerror(e
));
1770 memset(&pnl
, 0, sizeof(pnl
));
1771 pnl
.proto
= IPPROTO_TCP
;
1772 pnl
.direction
= PF_OUT
;
1773 if (proxy_sa
->sa_family
== AF_INET
) {
1774 struct sockaddr_in
*sin
= (struct sockaddr_in
*)proxy_sa
;
1776 pnl
.saddr
.v4
.s_addr
= tor_addr_to_ipv4n(&conn
->_base
.addr
);
1777 pnl
.sport
= htons(conn
->_base
.port
);
1778 pnl
.daddr
.v4
.s_addr
= sin
->sin_addr
.s_addr
;
1779 pnl
.dport
= sin
->sin_port
;
1780 } else if (proxy_sa
->sa_family
== AF_INET6
) {
1781 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)proxy_sa
;
1783 memcpy(&pnl
.saddr
.v6
, tor_addr_to_in6(&conn
->_base
.addr
),
1784 sizeof(struct in6_addr
));
1785 pnl
.sport
= htons(conn
->_base
.port
);
1786 memcpy(&pnl
.daddr
.v6
, &sin6
->sin6_addr
, sizeof(struct in6_addr
));
1787 pnl
.dport
= sin6
->sin6_port
;
1789 log_warn(LD_NET
, "getsockname() gave an unexpected address family (%d)",
1790 (int)proxy_sa
->sa_family
);
1794 pf
= get_pf_socket();
1798 if (ioctl(pf
, DIOCNATLOOK
, &pnl
) < 0) {
1799 log_warn(LD_NET
, "ioctl(DIOCNATLOOK) failed: %s", strerror(errno
));
1803 if (pnl
.af
== AF_INET
) {
1804 tor_addr_from_ipv4n(&addr
, pnl
.rdaddr
.v4
.s_addr
);
1805 } else if (pnl
.af
== AF_INET6
) {
1806 tor_addr_from_in6(&addr
, &pnl
.rdaddr
.v6
);
1808 tor_fragile_assert();
1812 tor_addr_to_str(req
->address
, &addr
, sizeof(req
->address
), 0);
1813 req
->port
= ntohs(pnl
.rdport
);
1819 log_warn(LD_BUG
, "Called connection_ap_get_original_destination, but no "
1820 "transparent proxy method was configured.");
1825 /** connection_edge_process_inbuf() found a conn in state
1826 * socks_wait. See if conn->inbuf has the right bytes to proceed with
1827 * the socks handshake.
1829 * If the handshake is complete, send it to
1830 * connection_ap_handshake_rewrite_and_attach().
1832 * Return -1 if an unexpected error with conn occurs (and mark it for close),
1836 connection_ap_handshake_process_socks(edge_connection_t
*conn
)
1838 socks_request_t
*socks
;
1840 or_options_t
*options
= get_options();
1843 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
1844 tor_assert(conn
->_base
.state
== AP_CONN_STATE_SOCKS_WAIT
);
1845 tor_assert(conn
->socks_request
);
1846 socks
= conn
->socks_request
;
1848 log_debug(LD_APP
,"entered.");
1850 sockshere
= fetch_from_buf_socks(conn
->_base
.inbuf
, socks
,
1851 options
->TestSocks
, options
->SafeSocks
);
1852 if (sockshere
== 0) {
1853 if (socks
->replylen
) {
1854 connection_write_to_buf(socks
->reply
, socks
->replylen
, TO_CONN(conn
));
1855 /* zero it out so we can do another round of negotiation */
1856 socks
->replylen
= 0;
1858 log_debug(LD_APP
,"socks handshake not all here yet.");
1861 } else if (sockshere
== -1) {
1862 if (socks
->replylen
) { /* we should send reply back */
1863 log_debug(LD_APP
,"reply is already set for us. Using it.");
1864 connection_ap_handshake_socks_reply(conn
, socks
->reply
, socks
->replylen
,
1865 END_STREAM_REASON_SOCKSPROTOCOL
);
1868 log_warn(LD_APP
,"Fetching socks handshake failed. Closing.");
1869 connection_ap_handshake_socks_reply(conn
, NULL
, 0,
1870 END_STREAM_REASON_SOCKSPROTOCOL
);
1872 connection_mark_unattached_ap(conn
,
1873 END_STREAM_REASON_SOCKSPROTOCOL
|
1874 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1876 } /* else socks handshake is done, continue processing */
1878 if (SOCKS_COMMAND_IS_CONNECT(socks
->command
))
1879 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
1881 control_event_stream_status(conn
, STREAM_EVENT_NEW_RESOLVE
, 0);
1883 if (options
->LeaveStreamsUnattached
) {
1884 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
1887 return connection_ap_handshake_rewrite_and_attach(conn
, NULL
, NULL
);
1890 /** connection_init_accepted_conn() found a new trans AP conn.
1891 * Get the original destination and send it to
1892 * connection_ap_handshake_rewrite_and_attach().
1894 * Return -1 if an unexpected error with conn (and it should be marked
1895 * for close), else return 0.
1898 connection_ap_process_transparent(edge_connection_t
*conn
)
1900 socks_request_t
*socks
;
1901 or_options_t
*options
= get_options();
1904 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
1905 tor_assert(conn
->socks_request
);
1906 socks
= conn
->socks_request
;
1908 /* pretend that a socks handshake completed so we don't try to
1909 * send a socks reply down a transparent conn */
1910 socks
->command
= SOCKS_COMMAND_CONNECT
;
1911 socks
->has_finished
= 1;
1913 log_debug(LD_APP
,"entered.");
1915 if (connection_ap_get_original_destination(conn
, socks
) < 0) {
1916 log_warn(LD_APP
,"Fetching original destination failed. Closing.");
1917 connection_mark_unattached_ap(conn
,
1918 END_STREAM_REASON_CANT_FETCH_ORIG_DEST
);
1921 /* we have the original destination */
1923 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
1925 if (options
->LeaveStreamsUnattached
) {
1926 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
1929 return connection_ap_handshake_rewrite_and_attach(conn
, NULL
, NULL
);
1932 /** connection_edge_process_inbuf() found a conn in state natd_wait. See if
1933 * conn-\>inbuf has the right bytes to proceed. See FreeBSD's libalias(3) and
1934 * ProxyEncodeTcpStream() in src/lib/libalias/alias_proxy.c for the encoding
1935 * form of the original destination.
1937 * If the original destination is complete, send it to
1938 * connection_ap_handshake_rewrite_and_attach().
1940 * Return -1 if an unexpected error with conn (and it should be marked
1941 * for close), else return 0.
1944 connection_ap_process_natd(edge_connection_t
*conn
)
1946 char tmp_buf
[36], *tbuf
, *daddr
;
1949 socks_request_t
*socks
;
1950 or_options_t
*options
= get_options();
1953 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
1954 tor_assert(conn
->_base
.state
== AP_CONN_STATE_NATD_WAIT
);
1955 tor_assert(conn
->socks_request
);
1956 socks
= conn
->socks_request
;
1958 log_debug(LD_APP
,"entered.");
1960 /* look for LF-terminated "[DEST ip_addr port]"
1961 * where ip_addr is a dotted-quad and port is in string form */
1962 err
= fetch_from_buf_line(conn
->_base
.inbuf
, tmp_buf
, &tlen
);
1966 log_warn(LD_APP
,"Natd handshake failed (DEST too long). Closing");
1967 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
1971 if (strcmpstart(tmp_buf
, "[DEST ")) {
1972 log_warn(LD_APP
,"Natd handshake was ill-formed; closing. The client "
1975 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
1979 daddr
= tbuf
= &tmp_buf
[0] + 6; /* after end of "[DEST " */
1980 if (!(tbuf
= strchr(tbuf
, ' '))) {
1981 log_warn(LD_APP
,"Natd handshake was ill-formed; closing. The client "
1984 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
1989 /* pretend that a socks handshake completed so we don't try to
1990 * send a socks reply down a natd conn */
1991 strlcpy(socks
->address
, daddr
, sizeof(socks
->address
));
1992 socks
->port
= (uint16_t)
1993 tor_parse_long(tbuf
, 10, 1, 65535, &port_ok
, &daddr
);
1995 log_warn(LD_APP
,"Natd handshake failed; port %s is ill-formed or out "
1996 "of range.", escaped(tbuf
));
1997 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2001 socks
->command
= SOCKS_COMMAND_CONNECT
;
2002 socks
->has_finished
= 1;
2004 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2006 if (options
->LeaveStreamsUnattached
) {
2007 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
2010 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
2012 return connection_ap_handshake_rewrite_and_attach(conn
, NULL
, NULL
);
2015 /** Iterate over the two bytes of stream_id until we get one that is not
2016 * already in use; return it. Return 0 if can't get a unique stream_id.
2019 get_unique_stream_id_by_circ(origin_circuit_t
*circ
)
2021 edge_connection_t
*tmpconn
;
2022 streamid_t test_stream_id
;
2023 uint32_t attempts
=0;
2026 test_stream_id
= circ
->next_stream_id
++;
2027 if (++attempts
> 1<<16) {
2028 /* Make sure we don't loop forever if all stream_id's are used. */
2029 log_warn(LD_APP
,"No unused stream IDs. Failing.");
2032 if (test_stream_id
== 0)
2034 for (tmpconn
= circ
->p_streams
; tmpconn
; tmpconn
=tmpconn
->next_stream
)
2035 if (tmpconn
->stream_id
== test_stream_id
)
2037 return test_stream_id
;
2040 /** Write a relay begin cell, using destaddr and destport from ap_conn's
2041 * socks_request field, and send it down circ.
2043 * If ap_conn is broken, mark it for close and return -1. Else return 0.
2046 connection_ap_handshake_send_begin(edge_connection_t
*ap_conn
)
2048 char payload
[CELL_PAYLOAD_SIZE
];
2051 origin_circuit_t
*circ
;
2052 tor_assert(ap_conn
->on_circuit
);
2053 circ
= TO_ORIGIN_CIRCUIT(ap_conn
->on_circuit
);
2055 tor_assert(ap_conn
->_base
.type
== CONN_TYPE_AP
);
2056 tor_assert(ap_conn
->_base
.state
== AP_CONN_STATE_CIRCUIT_WAIT
);
2057 tor_assert(ap_conn
->socks_request
);
2058 tor_assert(SOCKS_COMMAND_IS_CONNECT(ap_conn
->socks_request
->command
));
2060 ap_conn
->stream_id
= get_unique_stream_id_by_circ(circ
);
2061 if (ap_conn
->stream_id
==0) {
2062 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2063 circuit_mark_for_close(TO_CIRCUIT(circ
), END_CIRC_REASON_RESOURCELIMIT
);
2067 tor_snprintf(payload
,RELAY_PAYLOAD_SIZE
, "%s:%d",
2068 (circ
->_base
.purpose
== CIRCUIT_PURPOSE_C_GENERAL
) ?
2069 ap_conn
->socks_request
->address
: "",
2070 ap_conn
->socks_request
->port
);
2071 payload_len
= (int)strlen(payload
)+1;
2074 "Sending relay cell to begin stream %d.", ap_conn
->stream_id
);
2076 begin_type
= ap_conn
->use_begindir
?
2077 RELAY_COMMAND_BEGIN_DIR
: RELAY_COMMAND_BEGIN
;
2078 if (begin_type
== RELAY_COMMAND_BEGIN
) {
2079 tor_assert(circ
->build_state
->onehop_tunnel
== 0);
2082 if (connection_edge_send_command(ap_conn
, begin_type
,
2083 begin_type
== RELAY_COMMAND_BEGIN
? payload
: NULL
,
2084 begin_type
== RELAY_COMMAND_BEGIN
? payload_len
: 0) < 0)
2085 return -1; /* circuit is closed, don't continue */
2087 ap_conn
->package_window
= STREAMWINDOW_START
;
2088 ap_conn
->deliver_window
= STREAMWINDOW_START
;
2089 ap_conn
->_base
.state
= AP_CONN_STATE_CONNECT_WAIT
;
2090 log_info(LD_APP
,"Address/port sent, ap socket %d, n_circ_id %d",
2091 ap_conn
->_base
.s
, circ
->_base
.n_circ_id
);
2092 control_event_stream_status(ap_conn
, STREAM_EVENT_SENT_CONNECT
, 0);
2096 /** Write a relay resolve cell, using destaddr and destport from ap_conn's
2097 * socks_request field, and send it down circ.
2099 * If ap_conn is broken, mark it for close and return -1. Else return 0.
2102 connection_ap_handshake_send_resolve(edge_connection_t
*ap_conn
)
2104 int payload_len
, command
;
2105 const char *string_addr
;
2106 char inaddr_buf
[REVERSE_LOOKUP_NAME_BUF_LEN
];
2107 origin_circuit_t
*circ
;
2108 tor_assert(ap_conn
->on_circuit
);
2109 circ
= TO_ORIGIN_CIRCUIT(ap_conn
->on_circuit
);
2111 tor_assert(ap_conn
->_base
.type
== CONN_TYPE_AP
);
2112 tor_assert(ap_conn
->_base
.state
== AP_CONN_STATE_CIRCUIT_WAIT
);
2113 tor_assert(ap_conn
->socks_request
);
2114 tor_assert(circ
->_base
.purpose
== CIRCUIT_PURPOSE_C_GENERAL
);
2116 command
= ap_conn
->socks_request
->command
;
2117 tor_assert(SOCKS_COMMAND_IS_RESOLVE(command
));
2119 ap_conn
->stream_id
= get_unique_stream_id_by_circ(circ
);
2120 if (ap_conn
->stream_id
==0) {
2121 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2122 /*XXXX022 _close_ the circuit because it's full? That sounds dumb. */
2123 circuit_mark_for_close(TO_CIRCUIT(circ
), END_CIRC_REASON_RESOURCELIMIT
);
2127 if (command
== SOCKS_COMMAND_RESOLVE
) {
2128 string_addr
= ap_conn
->socks_request
->address
;
2129 payload_len
= (int)strlen(string_addr
)+1;
2131 /* command == SOCKS_COMMAND_RESOLVE_PTR */
2132 const char *a
= ap_conn
->socks_request
->address
;
2136 /* We're doing a reverse lookup. The input could be an IP address, or
2137 * could be an .in-addr.arpa or .ip6.arpa address */
2138 r
= tor_addr_parse_reverse_lookup_name(&addr
, a
, AF_INET
, 1);
2140 log_warn(LD_APP
, "Rejecting ill-formed reverse lookup of %s",
2142 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2146 r
= tor_addr_to_reverse_lookup_name(inaddr_buf
, sizeof(inaddr_buf
), &addr
);
2148 log_warn(LD_BUG
, "Couldn't generate reverse lookup hostname of %s",
2150 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2154 string_addr
= inaddr_buf
;
2155 payload_len
= (int)strlen(inaddr_buf
)+1;
2156 tor_assert(payload_len
<= (int)sizeof(inaddr_buf
));
2159 if (payload_len
> RELAY_PAYLOAD_SIZE
) {
2160 /* This should be impossible: we don't accept addresses this big. */
2161 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2166 "Sending relay cell to begin stream %d.", ap_conn
->stream_id
);
2168 if (connection_edge_send_command(ap_conn
,
2169 RELAY_COMMAND_RESOLVE
,
2170 string_addr
, payload_len
) < 0)
2171 return -1; /* circuit is closed, don't continue */
2173 tor_free(ap_conn
->_base
.address
); /* Maybe already set by dnsserv. */
2174 ap_conn
->_base
.address
= tor_strdup("(Tor_internal)");
2175 ap_conn
->_base
.state
= AP_CONN_STATE_RESOLVE_WAIT
;
2176 log_info(LD_APP
,"Address sent for resolve, ap socket %d, n_circ_id %d",
2177 ap_conn
->_base
.s
, circ
->_base
.n_circ_id
);
2178 control_event_stream_status(ap_conn
, STREAM_EVENT_NEW
, 0);
2179 control_event_stream_status(ap_conn
, STREAM_EVENT_SENT_RESOLVE
, 0);
2183 /** Make an AP connection_t, make a new linked connection pair, and attach
2184 * one side to the conn, connection_add it, initialize it to circuit_wait,
2185 * and call connection_ap_handshake_attach_circuit(conn) on it.
2187 * Return the other end of the linked connection pair, or -1 if error.
2190 connection_ap_make_link(char *address
, uint16_t port
,
2191 const char *digest
, int use_begindir
, int want_onehop
)
2193 edge_connection_t
*conn
;
2195 log_info(LD_APP
,"Making internal %s tunnel to %s:%d ...",
2196 want_onehop
? "direct" : "anonymized" , safe_str(address
),port
);
2198 conn
= edge_connection_new(CONN_TYPE_AP
, AF_INET
);
2199 conn
->_base
.linked
= 1; /* so that we can add it safely below. */
2201 /* populate conn->socks_request */
2203 /* leave version at zero, so the socks_reply is empty */
2204 conn
->socks_request
->socks_version
= 0;
2205 conn
->socks_request
->has_finished
= 0; /* waiting for 'connected' */
2206 strlcpy(conn
->socks_request
->address
, address
,
2207 sizeof(conn
->socks_request
->address
));
2208 conn
->socks_request
->port
= port
;
2209 conn
->socks_request
->command
= SOCKS_COMMAND_CONNECT
;
2210 conn
->want_onehop
= want_onehop
;
2211 conn
->use_begindir
= use_begindir
;
2213 conn
->chosen_exit_name
= tor_malloc(HEX_DIGEST_LEN
+2);
2214 conn
->chosen_exit_name
[0] = '$';
2216 base16_encode(conn
->chosen_exit_name
+1,HEX_DIGEST_LEN
+1,
2217 digest
, DIGEST_LEN
);
2220 conn
->_base
.address
= tor_strdup("(Tor_internal)");
2221 tor_addr_make_unspec(&conn
->_base
.addr
);
2222 conn
->_base
.port
= 0;
2224 if (connection_add(TO_CONN(conn
)) < 0) { /* no space, forget it */
2225 connection_free(TO_CONN(conn
));
2229 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
2231 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2233 /* attaching to a dirty circuit is fine */
2234 if (connection_ap_handshake_attach_circuit(conn
) < 0) {
2235 if (!conn
->_base
.marked_for_close
)
2236 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
2240 log_info(LD_APP
,"... application connection created and linked.");
2244 /** Notify any interested controller connections about a new hostname resolve
2245 * or resolve error. Takes the same arguments as does
2246 * connection_ap_handshake_socks_resolved(). */
2248 tell_controller_about_resolved_result(edge_connection_t
*conn
,
2256 if (ttl
>= 0 && (answer_type
== RESOLVED_TYPE_IPV4
||
2257 answer_type
== RESOLVED_TYPE_HOSTNAME
)) {
2258 return; /* we already told the controller. */
2259 } else if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
>= 4) {
2261 char buf
[INET_NTOA_BUF_LEN
];
2262 in
.s_addr
= get_uint32(answer
);
2263 tor_inet_ntoa(&in
, buf
, sizeof(buf
));
2264 control_event_address_mapped(conn
->socks_request
->address
,
2265 buf
, expires
, NULL
);
2266 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
<256) {
2267 char *cp
= tor_strndup(answer
, answer_len
);
2268 control_event_address_mapped(conn
->socks_request
->address
,
2272 control_event_address_mapped(conn
->socks_request
->address
,
2279 /** Send an answer to an AP connection that has requested a DNS lookup via
2280 * SOCKS. The type should be one of RESOLVED_TYPE_(IPV4|IPV6|HOSTNAME) or -1
2281 * for unreachable; the answer should be in the format specified in the socks
2282 * extensions document. <b>ttl</b> is the ttl for the answer, or -1 on
2283 * certain errors or for values that didn't come via DNS. <b>expires</b> is
2284 * a time when the answer expires, or -1 or TIME_MAX if there's a good TTL.
2286 /* XXXX022 the use of the ttl and expires fields is nutty. Let's make this
2287 * interface and those that use it less ugly. */
2289 connection_ap_handshake_socks_resolved(edge_connection_t
*conn
,
2300 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2301 uint32_t a
= ntohl(get_uint32(answer
));
2303 client_dns_set_addressmap(conn
->socks_request
->address
, a
,
2304 conn
->chosen_exit_name
, ttl
);
2305 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
< 256) {
2306 char *cp
= tor_strndup(answer
, answer_len
);
2307 client_dns_set_reverse_addressmap(conn
->socks_request
->address
,
2309 conn
->chosen_exit_name
, ttl
);
2314 if (conn
->is_dns_request
) {
2315 if (conn
->dns_server_request
) {
2316 /* We had a request on our DNS port: answer it. */
2317 dnsserv_resolved(conn
, answer_type
, answer_len
, answer
, ttl
);
2318 conn
->socks_request
->has_finished
= 1;
2321 /* This must be a request from the controller. We already sent
2322 * a mapaddress if there's a ttl. */
2323 tell_controller_about_resolved_result(conn
, answer_type
, answer_len
,
2324 answer
, ttl
, expires
);
2325 conn
->socks_request
->has_finished
= 1;
2328 /* We shouldn't need to free conn here; it gets marked by the caller. */
2331 if (conn
->socks_request
->socks_version
== 4) {
2332 buf
[0] = 0x00; /* version */
2333 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2334 buf
[1] = SOCKS4_GRANTED
;
2335 set_uint16(buf
+2, 0);
2336 memcpy(buf
+4, answer
, 4); /* address */
2337 replylen
= SOCKS4_NETWORK_LEN
;
2338 } else { /* "error" */
2339 buf
[1] = SOCKS4_REJECT
;
2340 memset(buf
+2, 0, 6);
2341 replylen
= SOCKS4_NETWORK_LEN
;
2343 } else if (conn
->socks_request
->socks_version
== 5) {
2345 buf
[0] = 0x05; /* version */
2346 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2347 buf
[1] = SOCKS5_SUCCEEDED
;
2348 buf
[2] = 0; /* reserved */
2349 buf
[3] = 0x01; /* IPv4 address type */
2350 memcpy(buf
+4, answer
, 4); /* address */
2351 set_uint16(buf
+8, 0); /* port == 0. */
2353 } else if (answer_type
== RESOLVED_TYPE_IPV6
&& answer_len
== 16) {
2354 buf
[1] = SOCKS5_SUCCEEDED
;
2355 buf
[2] = 0; /* reserved */
2356 buf
[3] = 0x04; /* IPv6 address type */
2357 memcpy(buf
+4, answer
, 16); /* address */
2358 set_uint16(buf
+20, 0); /* port == 0. */
2360 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
< 256) {
2361 buf
[1] = SOCKS5_SUCCEEDED
;
2362 buf
[2] = 0; /* reserved */
2363 buf
[3] = 0x03; /* Domainname address type */
2364 buf
[4] = (char)answer_len
;
2365 memcpy(buf
+5, answer
, answer_len
); /* address */
2366 set_uint16(buf
+5+answer_len
, 0); /* port == 0. */
2367 replylen
= 5+answer_len
+2;
2369 buf
[1] = SOCKS5_HOST_UNREACHABLE
;
2370 memset(buf
+2, 0, 8);
2374 /* no socks version info; don't send anything back */
2377 connection_ap_handshake_socks_reply(conn
, buf
, replylen
,
2378 (answer_type
== RESOLVED_TYPE_IPV4
||
2379 answer_type
== RESOLVED_TYPE_IPV6
) ?
2380 0 : END_STREAM_REASON_RESOLVEFAILED
);
2383 /** Send a socks reply to stream <b>conn</b>, using the appropriate
2384 * socks version, etc, and mark <b>conn</b> as completed with SOCKS
2387 * If <b>reply</b> is defined, then write <b>replylen</b> bytes of it to conn
2388 * and return, else reply based on <b>endreason</b> (one of
2389 * END_STREAM_REASON_*). If <b>reply</b> is undefined, <b>endreason</b> can't
2390 * be 0 or REASON_DONE. Send endreason to the controller, if appropriate.
2393 connection_ap_handshake_socks_reply(edge_connection_t
*conn
, char *reply
,
2394 size_t replylen
, int endreason
)
2397 socks5_reply_status_t status
=
2398 stream_end_reason_to_socks5_response(endreason
);
2400 tor_assert(conn
->socks_request
); /* make sure it's an AP stream */
2402 control_event_stream_status(conn
,
2403 status
==SOCKS5_SUCCEEDED
? STREAM_EVENT_SUCCEEDED
: STREAM_EVENT_FAILED
,
2406 if (conn
->socks_request
->has_finished
) {
2407 log_warn(LD_BUG
, "(Harmless.) duplicate calls to "
2408 "connection_ap_handshake_socks_reply.");
2411 if (replylen
) { /* we already have a reply in mind */
2412 connection_write_to_buf(reply
, replylen
, TO_CONN(conn
));
2413 conn
->socks_request
->has_finished
= 1;
2416 if (conn
->socks_request
->socks_version
== 4) {
2417 memset(buf
,0,SOCKS4_NETWORK_LEN
);
2418 buf
[1] = (status
==SOCKS5_SUCCEEDED
? SOCKS4_GRANTED
: SOCKS4_REJECT
);
2419 /* leave version, destport, destip zero */
2420 connection_write_to_buf(buf
, SOCKS4_NETWORK_LEN
, TO_CONN(conn
));
2421 } else if (conn
->socks_request
->socks_version
== 5) {
2422 buf
[0] = 5; /* version 5 */
2423 buf
[1] = (char)status
;
2425 buf
[3] = 1; /* ipv4 addr */
2426 memset(buf
+4,0,6); /* Set external addr/port to 0.
2427 The spec doesn't seem to say what to do here. -RD */
2428 connection_write_to_buf(buf
,10,TO_CONN(conn
));
2430 /* If socks_version isn't 4 or 5, don't send anything.
2431 * This can happen in the case of AP bridges. */
2432 conn
->socks_request
->has_finished
= 1;
2436 /** A relay 'begin' or 'begin_dir' cell has arrived, and either we are
2437 * an exit hop for the circuit, or we are the origin and it is a
2440 * Launch a new exit connection and initialize things appropriately.
2442 * If it's a rendezvous stream, call connection_exit_connect() on
2445 * For general streams, call dns_resolve() on it first, and only call
2446 * connection_exit_connect() if the dns answer is already known.
2448 * Note that we don't call connection_add() on the new stream! We wait
2449 * for connection_exit_connect() to do that.
2451 * Return -(some circuit end reason) if we want to tear down <b>circ</b>.
2455 connection_exit_begin_conn(cell_t
*cell
, circuit_t
*circ
)
2457 edge_connection_t
*n_stream
;
2461 or_circuit_t
*or_circ
= NULL
;
2463 assert_circuit_ok(circ
);
2464 if (!CIRCUIT_IS_ORIGIN(circ
))
2465 or_circ
= TO_OR_CIRCUIT(circ
);
2467 relay_header_unpack(&rh
, cell
->payload
);
2469 /* Note: we have to use relay_send_command_from_edge here, not
2470 * connection_edge_end or connection_edge_send_command, since those require
2471 * that we have a stream connected to a circuit, and we don't connect to a
2472 * circuit until we have a pending/successful resolve. */
2474 if (!server_mode(get_options()) &&
2475 circ
->purpose
!= CIRCUIT_PURPOSE_S_REND_JOINED
) {
2476 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2477 "Relay begin cell at non-server. Closing.");
2478 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2479 END_STREAM_REASON_EXITPOLICY
, NULL
);
2483 if (rh
.command
== RELAY_COMMAND_BEGIN
) {
2484 if (!memchr(cell
->payload
+RELAY_HEADER_SIZE
, 0, rh
.length
)) {
2485 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2486 "Relay begin cell has no \\0. Closing.");
2487 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2488 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2491 if (parse_addr_port(LOG_PROTOCOL_WARN
, cell
->payload
+RELAY_HEADER_SIZE
,
2492 &address
,NULL
,&port
)<0) {
2493 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2494 "Unable to parse addr:port in relay begin cell. Closing.");
2495 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2496 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2500 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2501 "Missing port in relay begin cell. Closing.");
2502 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2503 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2507 if (or_circ
&& or_circ
->is_first_hop
&&
2508 !get_options()->AllowSingleHopExits
) {
2509 /* Don't let clients use us as a single-hop proxy, unless the user
2510 * has explicitly allowed that in the config. It attracts attackers
2511 * and users who'd be better off with, well, single-hop proxies.
2513 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2514 "Attempt to open a stream on first hop of circuit. Closing.");
2515 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2516 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2520 } else if (rh
.command
== RELAY_COMMAND_BEGIN_DIR
) {
2521 if (!directory_permits_begindir_requests(get_options()) ||
2522 circ
->purpose
!= CIRCUIT_PURPOSE_OR
) {
2523 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2524 END_STREAM_REASON_NOTDIRECTORY
, NULL
);
2527 /* Make sure to get the 'real' address of the previous hop: the
2528 * caller might want to know whether his IP address has changed, and
2529 * we might already have corrected _base.addr[ess] for the relay's
2530 * canonical IP address. */
2531 if (or_circ
&& or_circ
->p_conn
)
2532 address
= tor_dup_addr(&or_circ
->p_conn
->real_addr
);
2534 address
= tor_strdup("127.0.0.1");
2535 port
= 1; /* XXXX This value is never actually used anywhere, and there
2536 * isn't "really" a connection here. But we
2537 * need to set it to something nonzero. */
2539 log_warn(LD_BUG
, "Got an unexpected command %d", (int)rh
.command
);
2540 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2541 END_STREAM_REASON_INTERNAL
, NULL
);
2545 log_debug(LD_EXIT
,"Creating new exit connection.");
2546 n_stream
= edge_connection_new(CONN_TYPE_EXIT
, AF_INET
);
2548 /* Remember the tunneled request ID in the new edge connection, so that
2549 * we can measure download times. */
2550 TO_CONN(n_stream
)->dirreq_id
= circ
->dirreq_id
;
2552 n_stream
->_base
.purpose
= EXIT_PURPOSE_CONNECT
;
2554 n_stream
->stream_id
= rh
.stream_id
;
2555 n_stream
->_base
.port
= port
;
2556 /* leave n_stream->s at -1, because it's not yet valid */
2557 n_stream
->package_window
= STREAMWINDOW_START
;
2558 n_stream
->deliver_window
= STREAMWINDOW_START
;
2560 if (circ
->purpose
== CIRCUIT_PURPOSE_S_REND_JOINED
) {
2561 origin_circuit_t
*origin_circ
= TO_ORIGIN_CIRCUIT(circ
);
2562 log_info(LD_REND
,"begin is for rendezvous. configuring stream.");
2563 n_stream
->_base
.address
= tor_strdup("(rendezvous)");
2564 n_stream
->_base
.state
= EXIT_CONN_STATE_CONNECTING
;
2565 n_stream
->rend_data
= rend_data_dup(origin_circ
->rend_data
);
2566 tor_assert(connection_edge_is_rendezvous_stream(n_stream
));
2567 assert_circuit_ok(circ
);
2568 if (rend_service_set_connection_addr_port(n_stream
, origin_circ
) < 0) {
2569 log_info(LD_REND
,"Didn't find rendezvous service (port %d)",
2570 n_stream
->_base
.port
);
2571 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2572 END_STREAM_REASON_EXITPOLICY
,
2573 origin_circ
->cpath
->prev
);
2574 connection_free(TO_CONN(n_stream
));
2578 assert_circuit_ok(circ
);
2579 log_debug(LD_REND
,"Finished assigning addr/port");
2580 n_stream
->cpath_layer
= origin_circ
->cpath
->prev
; /* link it */
2582 /* add it into the linked list of n_streams on this circuit */
2583 n_stream
->next_stream
= origin_circ
->p_streams
;
2584 n_stream
->on_circuit
= circ
;
2585 origin_circ
->p_streams
= n_stream
;
2586 assert_circuit_ok(circ
);
2588 connection_exit_connect(n_stream
);
2592 tor_strlower(address
);
2593 n_stream
->_base
.address
= address
;
2594 n_stream
->_base
.state
= EXIT_CONN_STATE_RESOLVEFAILED
;
2595 /* default to failed, change in dns_resolve if it turns out not to fail */
2597 if (we_are_hibernating()) {
2598 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2599 END_STREAM_REASON_HIBERNATING
, NULL
);
2600 connection_free(TO_CONN(n_stream
));
2604 n_stream
->on_circuit
= circ
;
2606 if (rh
.command
== RELAY_COMMAND_BEGIN_DIR
) {
2607 tor_assert(or_circ
);
2608 if (or_circ
->p_conn
&& !tor_addr_is_null(&or_circ
->p_conn
->real_addr
))
2609 tor_addr_assign(&n_stream
->_base
.addr
, &or_circ
->p_conn
->real_addr
);
2610 return connection_exit_connect_dir(n_stream
);
2613 log_debug(LD_EXIT
,"about to start the dns_resolve().");
2615 /* send it off to the gethostbyname farm */
2616 switch (dns_resolve(n_stream
)) {
2617 case 1: /* resolve worked; now n_stream is attached to circ. */
2618 assert_circuit_ok(circ
);
2619 log_debug(LD_EXIT
,"about to call connection_exit_connect().");
2620 connection_exit_connect(n_stream
);
2622 case -1: /* resolve failed */
2623 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2624 END_STREAM_REASON_RESOLVEFAILED
, NULL
);
2625 /* n_stream got freed. don't touch it. */
2627 case 0: /* resolve added to pending list */
2628 assert_circuit_ok(circ
);
2635 * Called when we receive a RELAY_COMMAND_RESOLVE cell 'cell' along the
2636 * circuit <b>circ</b>;
2637 * begin resolving the hostname, and (eventually) reply with a RESOLVED cell.
2640 connection_exit_begin_resolve(cell_t
*cell
, or_circuit_t
*circ
)
2642 edge_connection_t
*dummy_conn
;
2645 assert_circuit_ok(TO_CIRCUIT(circ
));
2646 relay_header_unpack(&rh
, cell
->payload
);
2648 /* This 'dummy_conn' only exists to remember the stream ID
2649 * associated with the resolve request; and to make the
2650 * implementation of dns.c more uniform. (We really only need to
2651 * remember the circuit, the stream ID, and the hostname to be
2652 * resolved; but if we didn't store them in a connection like this,
2653 * the housekeeping in dns.c would get way more complicated.)
2655 dummy_conn
= edge_connection_new(CONN_TYPE_EXIT
, AF_INET
);
2656 dummy_conn
->stream_id
= rh
.stream_id
;
2657 dummy_conn
->_base
.address
= tor_strndup(cell
->payload
+RELAY_HEADER_SIZE
,
2659 dummy_conn
->_base
.port
= 0;
2660 dummy_conn
->_base
.state
= EXIT_CONN_STATE_RESOLVEFAILED
;
2661 dummy_conn
->_base
.purpose
= EXIT_PURPOSE_RESOLVE
;
2663 dummy_conn
->on_circuit
= TO_CIRCUIT(circ
);
2665 /* send it off to the gethostbyname farm */
2666 switch (dns_resolve(dummy_conn
)) {
2667 case -1: /* Impossible to resolve; a resolved cell was sent. */
2668 /* Connection freed; don't touch it. */
2670 case 1: /* The result was cached; a resolved cell was sent. */
2671 if (!dummy_conn
->_base
.marked_for_close
)
2672 connection_free(TO_CONN(dummy_conn
));
2674 case 0: /* resolve added to pending list */
2675 assert_circuit_ok(TO_CIRCUIT(circ
));
2681 /** Connect to conn's specified addr and port. If it worked, conn
2682 * has now been added to the connection_array.
2684 * Send back a connected cell. Include the resolved IP of the destination
2685 * address, but <em>only</em> if it's a general exit stream. (Rendezvous
2686 * streams must not reveal what IP they connected to.)
2689 connection_exit_connect(edge_connection_t
*edge_conn
)
2691 const tor_addr_t
*addr
;
2693 connection_t
*conn
= TO_CONN(edge_conn
);
2694 int socket_error
= 0;
2696 if (!connection_edge_is_rendezvous_stream(edge_conn
) &&
2697 router_compare_to_my_exit_policy(edge_conn
)) {
2698 log_info(LD_EXIT
,"%s:%d failed exit policy. Closing.",
2699 escaped_safe_str(conn
->address
), conn
->port
);
2700 connection_edge_end(edge_conn
, END_STREAM_REASON_EXITPOLICY
);
2701 circuit_detach_stream(circuit_get_by_edge_conn(edge_conn
), edge_conn
);
2702 connection_free(conn
);
2709 log_debug(LD_EXIT
,"about to try connecting");
2710 switch (connection_connect(conn
, conn
->address
, addr
, port
, &socket_error
)) {
2712 /* XXX021 use socket_error below rather than trying to piece things
2713 * together from the current errno, which may have been clobbered. */
2714 connection_edge_end_errno(edge_conn
);
2715 circuit_detach_stream(circuit_get_by_edge_conn(edge_conn
), edge_conn
);
2716 connection_free(conn
);
2719 conn
->state
= EXIT_CONN_STATE_CONNECTING
;
2721 connection_watch_events(conn
, READ_EVENT
| WRITE_EVENT
);
2722 /* writable indicates finish;
2723 * readable/error indicates broken link in windows-land. */
2725 /* case 1: fall through */
2728 conn
->state
= EXIT_CONN_STATE_OPEN
;
2729 if (connection_wants_to_flush(conn
)) {
2730 /* in case there are any queued data cells */
2731 log_warn(LD_BUG
,"newly connected conn had data waiting!");
2732 // connection_start_writing(conn);
2734 connection_watch_events(conn
, READ_EVENT
);
2736 /* also, deliver a 'connected' cell back through the circuit. */
2737 if (connection_edge_is_rendezvous_stream(edge_conn
)) {
2738 /* rendezvous stream */
2739 /* don't send an address back! */
2740 connection_edge_send_command(edge_conn
,
2741 RELAY_COMMAND_CONNECTED
,
2743 } else { /* normal stream */
2744 char connected_payload
[20];
2745 int connected_payload_len
;
2746 if (tor_addr_family(&conn
->addr
) == AF_INET
) {
2747 set_uint32(connected_payload
, tor_addr_to_ipv4n(&conn
->addr
));
2748 connected_payload_len
= 4;
2750 memcpy(connected_payload
, tor_addr_to_in6_addr8(&conn
->addr
), 16);
2751 connected_payload_len
= 16;
2753 set_uint32(connected_payload
+connected_payload_len
,
2754 htonl(dns_clip_ttl(edge_conn
->address_ttl
)));
2755 connected_payload_len
+= 4;
2756 connection_edge_send_command(edge_conn
,
2757 RELAY_COMMAND_CONNECTED
,
2758 connected_payload
, connected_payload_len
);
2762 /** Given an exit conn that should attach to us as a directory server, open a
2763 * bridge connection with a linked connection pair, create a new directory
2764 * conn, and join them together. Return 0 on success (or if there was an
2765 * error we could send back an end cell for). Return -(some circuit end
2766 * reason) if the circuit needs to be torn down. Either connects
2767 * <b>exitconn</b>, frees it, or marks it, as appropriate.
2770 connection_exit_connect_dir(edge_connection_t
*exitconn
)
2772 dir_connection_t
*dirconn
= NULL
;
2773 or_circuit_t
*circ
= TO_OR_CIRCUIT(exitconn
->on_circuit
);
2775 log_info(LD_EXIT
, "Opening local connection for anonymized directory exit");
2777 exitconn
->_base
.state
= EXIT_CONN_STATE_OPEN
;
2779 dirconn
= dir_connection_new(AF_INET
);
2781 tor_addr_assign(&dirconn
->_base
.addr
, &exitconn
->_base
.addr
);
2782 dirconn
->_base
.port
= 0;
2783 dirconn
->_base
.address
= tor_strdup(exitconn
->_base
.address
);
2784 dirconn
->_base
.type
= CONN_TYPE_DIR
;
2785 dirconn
->_base
.purpose
= DIR_PURPOSE_SERVER
;
2786 dirconn
->_base
.state
= DIR_CONN_STATE_SERVER_COMMAND_WAIT
;
2788 /* Note that the new dir conn belongs to the same tunneled request as
2789 * the edge conn, so that we can measure download times. */
2790 TO_CONN(dirconn
)->dirreq_id
= TO_CONN(exitconn
)->dirreq_id
;
2792 connection_link_connections(TO_CONN(dirconn
), TO_CONN(exitconn
));
2794 if (connection_add(TO_CONN(exitconn
))<0) {
2795 connection_edge_end(exitconn
, END_STREAM_REASON_RESOURCELIMIT
);
2796 connection_free(TO_CONN(exitconn
));
2797 connection_free(TO_CONN(dirconn
));
2801 /* link exitconn to circ, now that we know we can use it. */
2802 exitconn
->next_stream
= circ
->n_streams
;
2803 circ
->n_streams
= exitconn
;
2805 if (connection_add(TO_CONN(dirconn
))<0) {
2806 connection_edge_end(exitconn
, END_STREAM_REASON_RESOURCELIMIT
);
2807 connection_close_immediate(TO_CONN(exitconn
));
2808 connection_mark_for_close(TO_CONN(exitconn
));
2809 connection_free(TO_CONN(dirconn
));
2813 connection_start_reading(TO_CONN(dirconn
));
2814 connection_start_reading(TO_CONN(exitconn
));
2816 if (connection_edge_send_command(exitconn
,
2817 RELAY_COMMAND_CONNECTED
, NULL
, 0) < 0) {
2818 connection_mark_for_close(TO_CONN(exitconn
));
2819 connection_mark_for_close(TO_CONN(dirconn
));
2826 /** Return 1 if <b>conn</b> is a rendezvous stream, or 0 if
2827 * it is a general stream.
2830 connection_edge_is_rendezvous_stream(edge_connection_t
*conn
)
2833 if (conn
->rend_data
)
2838 /** Return 1 if router <b>exit</b> is likely to allow stream <b>conn</b>
2839 * to exit from it, or 0 if it probably will not allow it.
2840 * (We might be uncertain if conn's destination address has not yet been
2844 connection_ap_can_use_exit(edge_connection_t
*conn
, routerinfo_t
*exit
)
2847 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
2848 tor_assert(conn
->socks_request
);
2851 /* If a particular exit node has been requested for the new connection,
2852 * make sure the exit node of the existing circuit matches exactly.
2854 if (conn
->chosen_exit_name
) {
2855 routerinfo_t
*chosen_exit
=
2856 router_get_by_nickname(conn
->chosen_exit_name
, 1);
2857 if (!chosen_exit
|| memcmp(chosen_exit
->cache_info
.identity_digest
,
2858 exit
->cache_info
.identity_digest
, DIGEST_LEN
)) {
2860 // log_debug(LD_APP,"Requested node '%s', considering node '%s'. No.",
2861 // conn->chosen_exit_name, exit->nickname);
2866 if (conn
->socks_request
->command
== SOCKS_COMMAND_CONNECT
&&
2867 !conn
->use_begindir
) {
2870 addr_policy_result_t r
;
2871 if (tor_inet_aton(conn
->socks_request
->address
, &in
))
2872 addr
= ntohl(in
.s_addr
);
2873 r
= compare_addr_to_addr_policy(addr
, conn
->socks_request
->port
,
2875 if (r
== ADDR_POLICY_REJECTED
)
2876 return 0; /* We know the address, and the exit policy rejects it. */
2877 if (r
== ADDR_POLICY_PROBABLY_REJECTED
&& !conn
->chosen_exit_name
)
2878 return 0; /* We don't know the addr, but the exit policy rejects most
2879 * addresses with this port. Since the user didn't ask for
2880 * this node, err on the side of caution. */
2881 } else if (SOCKS_COMMAND_IS_RESOLVE(conn
->socks_request
->command
)) {
2882 /* Can't support reverse lookups without eventdns. */
2883 if (conn
->socks_request
->command
== SOCKS_COMMAND_RESOLVE_PTR
&&
2884 exit
->has_old_dnsworkers
)
2887 /* Don't send DNS requests to non-exit servers by default. */
2888 if (!conn
->chosen_exit_name
&& policy_is_reject_star(exit
->exit_policy
))
2894 /** If address is of the form "y.onion" with a well-formed handle y:
2895 * Put a NUL after y, lower-case it, and return ONION_HOSTNAME.
2897 * If address is of the form "y.exit" and <b>allowdotexit</b> is true:
2898 * Put a NUL after y and return EXIT_HOSTNAME.
2901 * Return NORMAL_HOSTNAME and change nothing.
2904 parse_extended_hostname(char *address
, int allowdotexit
)
2907 char query
[REND_SERVICE_ID_LEN_BASE32
+1];
2909 s
= strrchr(address
,'.');
2911 return NORMAL_HOSTNAME
; /* no dot, thus normal */
2912 if (!strcmp(s
+1,"exit")) {
2914 *s
= 0; /* NUL-terminate it */
2915 return EXIT_HOSTNAME
; /* .exit */
2917 log_warn(LD_APP
, "The \".exit\" notation is disabled in Tor due to "
2918 "security risks. Set AllowDotExit in your torrc to enable it.");
2919 /* FFFF send a controller event too to notify Vidalia users */
2921 if (strcmp(s
+1,"onion"))
2922 return NORMAL_HOSTNAME
; /* neither .exit nor .onion, thus normal */
2924 /* so it is .onion */
2925 *s
= 0; /* NUL-terminate it */
2926 if (strlcpy(query
, address
, REND_SERVICE_ID_LEN_BASE32
+1) >=
2927 REND_SERVICE_ID_LEN_BASE32
+1)
2929 if (rend_valid_service_id(query
)) {
2930 return ONION_HOSTNAME
; /* success */
2933 /* otherwise, return to previous state and return 0 */
2935 return BAD_HOSTNAME
;