1 /* Copyright (c) 2001 Matej Pfajfar.
2 * Copyright (c) 2001-2004, Roger Dingledine.
3 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
4 * Copyright (c) 2007-2008, The Tor Project, Inc. */
5 /* See LICENSE for licensing information */
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_status(conn
, STREAM_EVENT_CLOSED
,
164 END_STREAM_REASON_DESTROY
);
165 conn
->end_reason
|= END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED
;
167 /* closing the circuit, nothing to send an END to */
168 conn
->edge_has_sent_end
= 1;
169 conn
->end_reason
= END_STREAM_REASON_DESTROY
;
170 conn
->end_reason
|= END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED
;
171 connection_mark_for_close(TO_CONN(conn
));
172 conn
->_base
.hold_open_until_flushed
= 1;
175 conn
->cpath_layer
= NULL
;
176 conn
->on_circuit
= NULL
;
180 /** Send a raw end cell to the stream with ID <b>stream_id</b> out over the
181 * <b>circ</b> towards the hop identified with <b>cpath_layer</b>. If this
182 * is not a client connection, set the relay end cell's reason for closing
183 * as <b>reason</b> */
185 relay_send_end_cell_from_edge(streamid_t stream_id
, circuit_t
*circ
,
186 uint8_t reason
, crypt_path_t
*cpath_layer
)
190 if (CIRCUIT_PURPOSE_IS_CLIENT(circ
->purpose
)) {
191 /* Never send the server an informative reason code; it doesn't need to
192 * know why the client stream is failing. */
193 reason
= END_STREAM_REASON_MISC
;
196 payload
[0] = (char) reason
;
198 return relay_send_command_from_edge(stream_id
, circ
, RELAY_COMMAND_END
,
199 payload
, 1, cpath_layer
);
202 /** Send a relay end cell from stream <b>conn</b> down conn's circuit, and
203 * remember that we've done so. If this is not a client connection, set the
204 * relay end cell's reason for closing as <b>reason</b>.
206 * Return -1 if this function has already been called on this conn,
210 connection_edge_end(edge_connection_t
*conn
, uint8_t reason
)
212 char payload
[RELAY_PAYLOAD_SIZE
];
213 size_t payload_len
=1;
215 uint8_t control_reason
= reason
;
217 if (conn
->edge_has_sent_end
) {
218 log_warn(LD_BUG
,"(Harmless.) Calling connection_edge_end (reason %d) "
219 "on an already ended stream?", reason
);
220 tor_fragile_assert();
224 if (conn
->_base
.marked_for_close
) {
226 "called on conn that's already marked for close at %s:%d.",
227 conn
->_base
.marked_for_close_file
, conn
->_base
.marked_for_close
);
231 circ
= circuit_get_by_edge_conn(conn
);
232 if (circ
&& CIRCUIT_PURPOSE_IS_CLIENT(circ
->purpose
)) {
233 /* If this is a client circuit, don't send the server an informative
234 * reason code; it doesn't need to know why the client stream is
236 reason
= END_STREAM_REASON_MISC
;
239 payload
[0] = (char)reason
;
240 if (reason
== END_STREAM_REASON_EXITPOLICY
&&
241 !connection_edge_is_rendezvous_stream(conn
)) {
243 if (tor_addr_family(&conn
->_base
.addr
) == AF_INET
) {
244 set_uint32(payload
+1, tor_addr_to_ipv4n(&conn
->_base
.addr
));
247 memcpy(payload
+1, tor_addr_to_in6_addr8(&conn
->_base
.addr
), 16);
250 set_uint32(payload
+1+addrlen
, htonl(dns_clip_ttl(conn
->address_ttl
)));
251 payload_len
+= 4+addrlen
;
254 if (circ
&& !circ
->marked_for_close
) {
255 log_debug(LD_EDGE
,"Sending end on conn (fd %d).",conn
->_base
.s
);
256 connection_edge_send_command(conn
, RELAY_COMMAND_END
,
257 payload
, payload_len
);
259 log_debug(LD_EDGE
,"No circ to send end on conn (fd %d).",
263 conn
->edge_has_sent_end
= 1;
264 conn
->end_reason
= control_reason
;
268 /** An error has just occured on an operation on an edge connection
269 * <b>conn</b>. Extract the errno; convert it to an end reason, and send an
270 * appropriate relay end cell to the other end of the connection's circuit.
273 connection_edge_end_errno(edge_connection_t
*conn
)
277 reason
= errno_to_stream_end_reason(tor_socket_errno(conn
->_base
.s
));
278 return connection_edge_end(conn
, reason
);
281 /** Connection <b>conn</b> has finished writing and has no bytes left on
284 * If it's in state 'open', stop writing, consider responding with a
285 * sendme, and return.
286 * Otherwise, stop writing and return.
288 * If <b>conn</b> is broken, mark it for close and return -1, else
292 connection_edge_finished_flushing(edge_connection_t
*conn
)
296 switch (conn
->_base
.state
) {
297 case AP_CONN_STATE_OPEN
:
298 case EXIT_CONN_STATE_OPEN
:
299 connection_stop_writing(TO_CONN(conn
));
300 connection_edge_consider_sending_sendme(conn
);
302 case AP_CONN_STATE_SOCKS_WAIT
:
303 case AP_CONN_STATE_NATD_WAIT
:
304 case AP_CONN_STATE_RENDDESC_WAIT
:
305 case AP_CONN_STATE_CIRCUIT_WAIT
:
306 case AP_CONN_STATE_CONNECT_WAIT
:
307 case AP_CONN_STATE_CONTROLLER_WAIT
:
308 connection_stop_writing(TO_CONN(conn
));
311 log_warn(LD_BUG
, "Called in unexpected state %d.",conn
->_base
.state
);
312 tor_fragile_assert();
318 /** Connected handler for exit connections: start writing pending
319 * data, deliver 'CONNECTED' relay cells as appropriate, and check
320 * any pending data that may have been received. */
322 connection_edge_finished_connecting(edge_connection_t
*edge_conn
)
326 tor_assert(edge_conn
);
327 tor_assert(edge_conn
->_base
.type
== CONN_TYPE_EXIT
);
328 conn
= TO_CONN(edge_conn
);
329 tor_assert(conn
->state
== EXIT_CONN_STATE_CONNECTING
);
331 log_info(LD_EXIT
,"Exit connection to %s:%u (%s) established.",
332 escaped_safe_str(conn
->address
),conn
->port
,
333 fmt_addr(&conn
->addr
));
335 conn
->state
= EXIT_CONN_STATE_OPEN
;
336 connection_watch_events(conn
, EV_READ
); /* stop writing, continue reading */
337 if (connection_wants_to_flush(conn
)) /* in case there are any queued relay
339 connection_start_writing(conn
);
340 /* deliver a 'connected' relay cell back through the circuit. */
341 if (connection_edge_is_rendezvous_stream(edge_conn
)) {
342 if (connection_edge_send_command(edge_conn
,
343 RELAY_COMMAND_CONNECTED
, NULL
, 0) < 0)
344 return 0; /* circuit is closed, don't continue */
346 char connected_payload
[20];
347 int connected_payload_len
;
348 if (tor_addr_family(&conn
->addr
) == AF_INET
) {
349 set_uint32(connected_payload
, tor_addr_to_ipv4n(&conn
->addr
));
350 set_uint32(connected_payload
+4,
351 htonl(dns_clip_ttl(edge_conn
->address_ttl
)));
352 connected_payload_len
= 8;
354 memcpy(connected_payload
, tor_addr_to_in6_addr8(&conn
->addr
), 16);
355 set_uint32(connected_payload
+16,
356 htonl(dns_clip_ttl(edge_conn
->address_ttl
)));
357 connected_payload_len
= 20;
359 if (connection_edge_send_command(edge_conn
,
360 RELAY_COMMAND_CONNECTED
,
361 connected_payload
, connected_payload_len
) < 0)
362 return 0; /* circuit is closed, don't continue */
364 tor_assert(edge_conn
->package_window
> 0);
365 /* in case the server has written anything */
366 return connection_edge_process_inbuf(edge_conn
, 1);
369 /** Define a schedule for how long to wait between retrying
370 * application connections. Rather than waiting a fixed amount of
371 * time between each retry, we wait 10 seconds each for the first
372 * two tries, and 15 seconds for each retry after
373 * that. Hopefully this will improve the expected user experience. */
375 compute_retry_timeout(edge_connection_t
*conn
)
377 if (conn
->num_socks_retries
< 2) /* try 0 and try 1 */
382 /** Find all general-purpose AP streams waiting for a response that sent their
383 * begin/resolve cell >=15 seconds ago. Detach from their current circuit, and
384 * mark their current circuit as unsuitable for new streams. Then call
385 * connection_ap_handshake_attach_circuit() to attach to a new circuit (if
386 * available) or launch a new one.
388 * For rendezvous streams, simply give up after SocksTimeout seconds (with no
392 connection_ap_expire_beginning(void)
394 edge_connection_t
*conn
;
396 time_t now
= time(NULL
);
397 or_options_t
*options
= get_options();
401 smartlist_t
*conns
= get_connection_array();
403 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, c
) {
404 if (c
->type
!= CONN_TYPE_AP
|| c
->marked_for_close
)
406 conn
= TO_EDGE_CONN(c
);
407 /* if it's an internal linked connection, don't yell its status. */
408 severity
= (tor_addr_is_null(&conn
->_base
.addr
) && !conn
->_base
.port
)
409 ? LOG_INFO
: LOG_NOTICE
;
410 seconds_idle
= (int)( now
- conn
->_base
.timestamp_lastread
);
412 /* XXX021 this clause was originally thought redundant with the
413 * clause in connection_ap_handshake_attach_circuit(). But actually,
414 * we need it because controllers that put streams in controller_wait
415 * state never go to the other clause. we should fix so it compares
416 * seconds since timestamp_created, not since last read. -RD */
417 if (AP_CONN_STATE_IS_UNATTACHED(conn
->_base
.state
)) {
418 if (seconds_idle
>= options
->SocksTimeout
) {
419 log_fn(severity
, LD_APP
,
420 "Tried for %d seconds to get a connection to %s:%d. "
422 seconds_idle
, safe_str(conn
->socks_request
->address
),
423 conn
->socks_request
->port
,
424 conn_state_to_string(CONN_TYPE_AP
, conn
->_base
.state
));
425 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TIMEOUT
);
430 if (conn
->_base
.state
== AP_CONN_STATE_OPEN
)
433 /* We're in state connect_wait or resolve_wait now -- waiting for a
434 * reply to our relay cell. See if we want to retry/give up. */
436 cutoff
= compute_retry_timeout(conn
);
437 if (seconds_idle
< cutoff
)
439 circ
= circuit_get_by_edge_conn(conn
);
440 if (!circ
) { /* it's vanished? */
441 log_info(LD_APP
,"Conn is waiting (address %s), but lost its circ.",
442 safe_str(conn
->socks_request
->address
));
443 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TIMEOUT
);
446 if (circ
->purpose
== CIRCUIT_PURPOSE_C_REND_JOINED
) {
447 if (seconds_idle
>= options
->SocksTimeout
) {
448 log_fn(severity
, LD_REND
,
449 "Rend stream is %d seconds late. Giving up on address"
452 safe_str(conn
->socks_request
->address
));
453 connection_edge_end(conn
, END_STREAM_REASON_TIMEOUT
);
454 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TIMEOUT
);
458 tor_assert(circ
->purpose
== CIRCUIT_PURPOSE_C_GENERAL
);
459 log_fn(cutoff
< 15 ? LOG_INFO
: severity
, LD_APP
,
460 "We tried for %d seconds to connect to '%s' using exit '%s'."
461 " Retrying on a new circuit.",
462 seconds_idle
, safe_str(conn
->socks_request
->address
),
464 conn
->cpath_layer
->extend_info
->nickname
: "*unnamed*");
465 /* send an end down the circuit */
466 connection_edge_end(conn
, END_STREAM_REASON_TIMEOUT
);
467 /* un-mark it as ending, since we're going to reuse it */
468 conn
->edge_has_sent_end
= 0;
469 conn
->end_reason
= 0;
470 /* kludge to make us not try this circuit again, yet to allow
471 * current streams on it to survive if they can: make it
472 * unattractive to use for new streams */
473 tor_assert(circ
->timestamp_dirty
);
474 circ
->timestamp_dirty
-= options
->MaxCircuitDirtiness
;
475 /* give our stream another 'cutoff' seconds to try */
476 conn
->_base
.timestamp_lastread
+= cutoff
;
477 if (conn
->num_socks_retries
< 250) /* avoid overflow */
478 conn
->num_socks_retries
++;
479 /* move it back into 'pending' state, and try to attach. */
480 if (connection_ap_detach_retriable(conn
, TO_ORIGIN_CIRCUIT(circ
),
481 END_STREAM_REASON_TIMEOUT
)<0) {
482 if (!conn
->_base
.marked_for_close
)
483 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
485 } SMARTLIST_FOREACH_END(conn
);
488 /** Tell any AP streams that are waiting for a new circuit to try again,
489 * either attaching to an available circ or launching a new one.
492 connection_ap_attach_pending(void)
494 edge_connection_t
*edge_conn
;
495 smartlist_t
*conns
= get_connection_array();
496 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
498 if (conn
->marked_for_close
||
499 conn
->type
!= CONN_TYPE_AP
||
500 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
502 edge_conn
= TO_EDGE_CONN(conn
);
503 if (connection_ap_handshake_attach_circuit(edge_conn
) < 0) {
504 if (!edge_conn
->_base
.marked_for_close
)
505 connection_mark_unattached_ap(edge_conn
,
506 END_STREAM_REASON_CANT_ATTACH
);
511 /** Tell any AP streams that are waiting for a onehop tunnel to
512 * <b>failed_digest</b> that they are going to fail. */
513 /* XXX022 We should get rid of this function, and instead attach
514 * onehop streams to circ->p_streams so they get marked in
515 * circuit_mark_for_close like normal p_streams. */
517 connection_ap_fail_onehop(const char *failed_digest
,
518 cpath_build_state_t
*build_state
)
520 edge_connection_t
*edge_conn
;
521 char digest
[DIGEST_LEN
];
522 smartlist_t
*conns
= get_connection_array();
523 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
524 if (conn
->marked_for_close
||
525 conn
->type
!= CONN_TYPE_AP
||
526 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
528 edge_conn
= TO_EDGE_CONN(conn
);
529 if (!edge_conn
->want_onehop
)
531 if (hexdigest_to_digest(edge_conn
->chosen_exit_name
, digest
) < 0 ||
532 memcmp(digest
, failed_digest
, DIGEST_LEN
))
534 if (tor_digest_is_zero(digest
)) {
535 /* we don't know the digest; have to compare addr:port */
537 if (!build_state
|| !build_state
->chosen_exit
||
538 !edge_conn
->socks_request
|| !edge_conn
->socks_request
->address
)
540 if (tor_addr_from_str(&addr
, edge_conn
->socks_request
->address
)<0 ||
541 !tor_addr_eq(&build_state
->chosen_exit
->addr
, &addr
) ||
542 build_state
->chosen_exit
->port
!= edge_conn
->socks_request
->port
)
545 log_info(LD_APP
, "Closing onehop stream to '%s/%s' because the OR conn "
546 "just failed.", edge_conn
->chosen_exit_name
,
547 edge_conn
->socks_request
->address
);
548 connection_mark_unattached_ap(edge_conn
, END_STREAM_REASON_TIMEOUT
);
549 } SMARTLIST_FOREACH_END(conn
);
552 /** A circuit failed to finish on its last hop <b>info</b>. If there
553 * are any streams waiting with this exit node in mind, but they
554 * don't absolutely require it, make them give up on it.
557 circuit_discard_optional_exit_enclaves(extend_info_t
*info
)
559 edge_connection_t
*edge_conn
;
560 routerinfo_t
*r1
, *r2
;
562 smartlist_t
*conns
= get_connection_array();
563 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
564 if (conn
->marked_for_close
||
565 conn
->type
!= CONN_TYPE_AP
||
566 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
568 edge_conn
= TO_EDGE_CONN(conn
);
569 if (!edge_conn
->chosen_exit_optional
&&
570 !edge_conn
->chosen_exit_retries
)
572 r1
= router_get_by_nickname(edge_conn
->chosen_exit_name
, 0);
573 r2
= router_get_by_nickname(info
->nickname
, 0);
574 if (!r1
|| !r2
|| r1
!= r2
)
576 tor_assert(edge_conn
->socks_request
);
577 if (edge_conn
->chosen_exit_optional
) {
578 log_info(LD_APP
, "Giving up on enclave exit '%s' for destination %s.",
579 safe_str(edge_conn
->chosen_exit_name
),
580 escaped_safe_str(edge_conn
->socks_request
->address
));
581 edge_conn
->chosen_exit_optional
= 0;
582 tor_free(edge_conn
->chosen_exit_name
); /* clears it */
583 /* if this port is dangerous, warn or reject it now that we don't
584 * think it'll be using an enclave. */
585 consider_plaintext_ports(edge_conn
, edge_conn
->socks_request
->port
);
587 if (edge_conn
->chosen_exit_retries
) {
588 if (--edge_conn
->chosen_exit_retries
== 0) { /* give up! */
589 clear_trackexithost_mappings(edge_conn
->chosen_exit_name
);
590 tor_free(edge_conn
->chosen_exit_name
); /* clears it */
591 /* if this port is dangerous, warn or reject it now that we don't
592 * think it'll be using an enclave. */
593 consider_plaintext_ports(edge_conn
, edge_conn
->socks_request
->port
);
596 } SMARTLIST_FOREACH_END(conn
);
599 /** The AP connection <b>conn</b> has just failed while attaching or
600 * sending a BEGIN or resolving on <b>circ</b>, but another circuit
601 * might work. Detach the circuit, and either reattach it, launch a
602 * new circuit, tell the controller, or give up as a appropriate.
604 * Returns -1 on err, 1 on success, 0 on not-yet-sure.
607 connection_ap_detach_retriable(edge_connection_t
*conn
, origin_circuit_t
*circ
,
610 control_event_stream_status(conn
, STREAM_EVENT_FAILED_RETRIABLE
, reason
);
611 conn
->_base
.timestamp_lastread
= time(NULL
);
612 if (!get_options()->LeaveStreamsUnattached
|| conn
->use_begindir
) {
613 /* If we're attaching streams ourself, or if this connection is
614 * a tunneled directory connection, then just attach it. */
615 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
616 circuit_detach_stream(TO_CIRCUIT(circ
),conn
);
617 return connection_ap_handshake_attach_circuit(conn
);
619 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
620 circuit_detach_stream(TO_CIRCUIT(circ
),conn
);
625 /** A client-side struct to remember requests to rewrite addresses
626 * to new addresses. These structs are stored in the hash table
627 * "addressmap" below.
629 * There are 5 ways to set an address mapping:
630 * - A MapAddress command from the controller [permanent]
631 * - An AddressMap directive in the torrc [permanent]
632 * - When a TrackHostExits torrc directive is triggered [temporary]
633 * - When a dns resolve succeeds [temporary]
634 * - When a dns resolve fails [temporary]
636 * When an addressmap request is made but one is already registered,
637 * the new one is replaced only if the currently registered one has
638 * no "new_address" (that is, it's in the process of dns resolve),
639 * or if the new one is permanent (expires==0 or 1).
641 * (We overload the 'expires' field, using "0" for mappings set via
642 * the configuration file, "1" for mappings set from the control
643 * interface, and other values for DNS and TrackHostExit mappings that can
649 addressmap_entry_source_t source
:3;
650 short num_resolve_failures
;
651 } addressmap_entry_t
;
653 /** Entry for mapping addresses to which virtual address we mapped them to. */
656 char *hostname_address
;
657 } virtaddress_entry_t
;
659 /** A hash table to store client-side address rewrite instructions. */
660 static strmap_t
*addressmap
=NULL
;
662 * Table mapping addresses to which virtual address, if any, we
665 * We maintain the following invariant: if [A,B] is in
666 * virtaddress_reversemap, then B must be a virtual address, and [A,B]
667 * must be in addressmap. We do not require that the converse hold:
668 * if it fails, then we could end up mapping two virtual addresses to
669 * the same address, which is no disaster.
671 static strmap_t
*virtaddress_reversemap
=NULL
;
673 /** Initialize addressmap. */
675 addressmap_init(void)
677 addressmap
= strmap_new();
678 virtaddress_reversemap
= strmap_new();
681 /** Free the memory associated with the addressmap entry <b>_ent</b>. */
683 addressmap_ent_free(void *_ent
)
685 addressmap_entry_t
*ent
= _ent
;
686 tor_free(ent
->new_address
);
690 /** Free storage held by a virtaddress_entry_t* entry in <b>ent</b>. */
692 addressmap_virtaddress_ent_free(void *_ent
)
694 virtaddress_entry_t
*ent
= _ent
;
695 tor_free(ent
->ipv4_address
);
696 tor_free(ent
->hostname_address
);
700 /** Free storage held by a virtaddress_entry_t* entry in <b>ent</b>. */
702 addressmap_virtaddress_remove(const char *address
, addressmap_entry_t
*ent
)
704 if (ent
&& ent
->new_address
&&
705 address_is_in_virtual_range(ent
->new_address
)) {
706 virtaddress_entry_t
*ve
=
707 strmap_get(virtaddress_reversemap
, ent
->new_address
);
708 /*log_fn(LOG_NOTICE,"remove reverse mapping for %s",ent->new_address);*/
710 if (!strcmp(address
, ve
->ipv4_address
))
711 tor_free(ve
->ipv4_address
);
712 if (!strcmp(address
, ve
->hostname_address
))
713 tor_free(ve
->hostname_address
);
714 if (!ve
->ipv4_address
&& !ve
->hostname_address
) {
716 strmap_remove(virtaddress_reversemap
, ent
->new_address
);
722 /** Remove <b>ent</b> (which must be mapped to by <b>address</b>) from the
723 * client address maps. */
725 addressmap_ent_remove(const char *address
, addressmap_entry_t
*ent
)
727 addressmap_virtaddress_remove(address
, ent
);
728 addressmap_ent_free(ent
);
731 /** Unregister all TrackHostExits mappings from any address to
732 * *.exitname.exit. */
734 clear_trackexithost_mappings(const char *exitname
)
738 if (!addressmap
|| !exitname
)
740 suffix_len
= strlen(exitname
) + 16;
741 suffix
= tor_malloc(suffix_len
);
742 tor_snprintf(suffix
, suffix_len
, ".%s.exit", exitname
);
743 tor_strlower(suffix
);
745 STRMAP_FOREACH_MODIFY(addressmap
, address
, addressmap_entry_t
*, ent
) {
746 if (ent
->source
== ADDRMAPSRC_TRACKEXIT
&& !strcmpend(address
, suffix
)) {
747 addressmap_ent_remove(address
, ent
);
748 MAP_DEL_CURRENT(address
);
750 } STRMAP_FOREACH_END
;
755 /** Remove all entries from the addressmap that were set via the
756 * configuration file or the command line. */
758 addressmap_clear_configured(void)
760 addressmap_get_mappings(NULL
, 0, 0, 0);
763 /** Remove all entries from the addressmap that are set to expire, ever. */
765 addressmap_clear_transient(void)
767 addressmap_get_mappings(NULL
, 2, TIME_MAX
, 0);
770 /** Clean out entries from the addressmap cache that were
771 * added long enough ago that they are no longer valid.
774 addressmap_clean(time_t now
)
776 addressmap_get_mappings(NULL
, 2, now
, 0);
779 /** Free all the elements in the addressmap, and free the addressmap
782 addressmap_free_all(void)
785 strmap_free(addressmap
, addressmap_ent_free
);
788 if (virtaddress_reversemap
) {
789 strmap_free(virtaddress_reversemap
, addressmap_virtaddress_ent_free
);
790 virtaddress_reversemap
= NULL
;
794 /** Look at address, and rewrite it until it doesn't want any
795 * more rewrites; but don't get into an infinite loop.
796 * Don't write more than maxlen chars into address. Return true if the
797 * address changed; false otherwise. Set *<b>expires_out</b> to the
798 * expiry time of the result, or to <b>time_max</b> if the result does
802 addressmap_rewrite(char *address
, size_t maxlen
, time_t *expires_out
)
804 addressmap_entry_t
*ent
;
807 time_t expires
= TIME_MAX
;
809 for (rewrites
= 0; rewrites
< 16; rewrites
++) {
810 ent
= strmap_get(addressmap
, address
);
812 if (!ent
|| !ent
->new_address
) {
814 *expires_out
= expires
;
815 return (rewrites
> 0); /* done, no rewrite needed */
818 cp
= tor_strdup(escaped_safe_str(ent
->new_address
));
819 log_info(LD_APP
, "Addressmap: rewriting %s to %s",
820 escaped_safe_str(address
), cp
);
821 if (ent
->expires
> 1 && ent
->expires
< expires
)
822 expires
= ent
->expires
;
824 strlcpy(address
, ent
->new_address
, maxlen
);
827 "Loop detected: we've rewritten %s 16 times! Using it as-is.",
828 escaped_safe_str(address
));
829 /* it's fine to rewrite a rewrite, but don't loop forever */
831 *expires_out
= TIME_MAX
;
835 /** If we have a cached reverse DNS entry for the address stored in the
836 * <b>maxlen</b>-byte buffer <b>address</b> (typically, a dotted quad) then
837 * rewrite to the cached value and return 1. Otherwise return 0. Set
838 * *<b>expires_out</b> to the expiry time of the result, or to <b>time_max</b>
839 * if the result does not expire. */
841 addressmap_rewrite_reverse(char *address
, size_t maxlen
, time_t *expires_out
)
843 size_t len
= maxlen
+ 16;
844 char *s
= tor_malloc(len
), *cp
;
845 addressmap_entry_t
*ent
;
847 tor_snprintf(s
, len
, "REVERSE[%s]", address
);
848 ent
= strmap_get(addressmap
, s
);
850 cp
= tor_strdup(escaped_safe_str(ent
->new_address
));
851 log_info(LD_APP
, "Rewrote reverse lookup %s -> %s",
852 escaped_safe_str(s
), cp
);
854 strlcpy(address
, ent
->new_address
, maxlen
);
859 *expires_out
= (ent
&& ent
->expires
> 1) ? ent
->expires
: TIME_MAX
;
865 /** Return 1 if <b>address</b> is already registered, else return 0. If address
866 * is already registered, and <b>update_expires</b> is non-zero, then update
867 * the expiry time on the mapping with update_expires if it is a
868 * mapping created by TrackHostExits. */
870 addressmap_have_mapping(const char *address
, int update_expiry
)
872 addressmap_entry_t
*ent
;
873 if (!(ent
=strmap_get_lc(addressmap
, address
)))
875 if (update_expiry
&& ent
->source
==ADDRMAPSRC_TRACKEXIT
)
876 ent
->expires
=time(NULL
) + update_expiry
;
880 /** Register a request to map <b>address</b> to <b>new_address</b>,
881 * which will expire on <b>expires</b> (or 0 if never expires from
882 * config file, 1 if never expires from controller, 2 if never expires
883 * (virtual address mapping) from the controller.)
885 * <b>new_address</b> should be a newly dup'ed string, which we'll use or
886 * free as appropriate. We will leave address alone.
888 * If <b>new_address</b> is NULL, or equal to <b>address</b>, remove
889 * any mappings that exist from <b>address</b>.
892 addressmap_register(const char *address
, char *new_address
, time_t expires
,
893 addressmap_entry_source_t source
)
895 addressmap_entry_t
*ent
;
897 ent
= strmap_get(addressmap
, address
);
898 if (!new_address
|| !strcasecmp(address
,new_address
)) {
899 /* Remove the mapping, if any. */
900 tor_free(new_address
);
902 addressmap_ent_remove(address
,ent
);
903 strmap_remove(addressmap
, address
);
907 if (!ent
) { /* make a new one and register it */
908 ent
= tor_malloc_zero(sizeof(addressmap_entry_t
));
909 strmap_set(addressmap
, address
, ent
);
910 } else if (ent
->new_address
) { /* we need to clean up the old mapping. */
912 log_info(LD_APP
,"Temporary addressmap ('%s' to '%s') not performed, "
913 "since it's already mapped to '%s'",
914 safe_str(address
), safe_str(new_address
), safe_str(ent
->new_address
));
915 tor_free(new_address
);
918 if (address_is_in_virtual_range(ent
->new_address
) &&
920 /* XXX This isn't the perfect test; we want to avoid removing
921 * mappings set from the control interface _as virtual mapping */
922 addressmap_virtaddress_remove(address
, ent
);
924 tor_free(ent
->new_address
);
925 } /* else { we have an in-progress resolve with no mapping. } */
927 ent
->new_address
= new_address
;
928 ent
->expires
= expires
==2 ? 1 : expires
;
929 ent
->num_resolve_failures
= 0;
930 ent
->source
= source
;
932 log_info(LD_CONFIG
, "Addressmap: (re)mapped '%s' to '%s'",
933 safe_str(address
), safe_str(ent
->new_address
));
934 control_event_address_mapped(address
, ent
->new_address
, expires
, NULL
);
937 /** An attempt to resolve <b>address</b> failed at some OR.
938 * Increment the number of resolve failures we have on record
939 * for it, and then return that number.
942 client_dns_incr_failures(const char *address
)
944 addressmap_entry_t
*ent
= strmap_get(addressmap
, address
);
946 ent
= tor_malloc_zero(sizeof(addressmap_entry_t
));
947 ent
->expires
= time(NULL
) + MAX_DNS_ENTRY_AGE
;
948 strmap_set(addressmap
,address
,ent
);
950 if (ent
->num_resolve_failures
< SHORT_MAX
)
951 ++ent
->num_resolve_failures
; /* don't overflow */
952 log_info(LD_APP
, "Address %s now has %d resolve failures.",
953 safe_str(address
), ent
->num_resolve_failures
);
954 return ent
->num_resolve_failures
;
957 /** If <b>address</b> is in the client dns addressmap, reset
958 * the number of resolve failures we have on record for it.
959 * This is used when we fail a stream because it won't resolve:
960 * otherwise future attempts on that address will only try once.
963 client_dns_clear_failures(const char *address
)
965 addressmap_entry_t
*ent
= strmap_get(addressmap
, address
);
967 ent
->num_resolve_failures
= 0;
970 /** Record the fact that <b>address</b> resolved to <b>name</b>.
971 * We can now use this in subsequent streams via addressmap_rewrite()
972 * so we can more correctly choose an exit that will allow <b>address</b>.
974 * If <b>exitname</b> is defined, then append the addresses with
975 * ".exitname.exit" before registering the mapping.
977 * If <b>ttl</b> is nonnegative, the mapping will be valid for
978 * <b>ttl</b>seconds; otherwise, we use the default.
981 client_dns_set_addressmap_impl(const char *address
, const char *name
,
982 const char *exitname
,
985 /* <address>.<hex or nickname>.exit\0 or just <address>\0 */
986 char extendedaddress
[MAX_SOCKS_ADDR_LEN
+MAX_VERBOSE_NICKNAME_LEN
+10];
987 /* 123.123.123.123.<hex or nickname>.exit\0 or just 123.123.123.123\0 */
988 char extendedval
[INET_NTOA_BUF_LEN
+MAX_VERBOSE_NICKNAME_LEN
+10];
994 ttl
= DEFAULT_DNS_TTL
;
996 ttl
= dns_clip_ttl(ttl
);
999 /* XXXX fails to ever get attempts to get an exit address of
1000 * google.com.digest[=~]nickname.exit; we need a syntax for this that
1001 * won't make strict RFC952-compliant applications (like us) barf. */
1002 tor_snprintf(extendedaddress
, sizeof(extendedaddress
),
1003 "%s.%s.exit", address
, exitname
);
1004 tor_snprintf(extendedval
, sizeof(extendedval
),
1005 "%s.%s.exit", name
, exitname
);
1007 tor_snprintf(extendedaddress
, sizeof(extendedaddress
),
1009 tor_snprintf(extendedval
, sizeof(extendedval
),
1012 addressmap_register(extendedaddress
, tor_strdup(extendedval
),
1013 time(NULL
) + ttl
, ADDRMAPSRC_DNS
);
1016 /** Record the fact that <b>address</b> resolved to <b>val</b>.
1017 * We can now use this in subsequent streams via addressmap_rewrite()
1018 * so we can more correctly choose an exit that will allow <b>address</b>.
1020 * If <b>exitname</b> is defined, then append the addresses with
1021 * ".exitname.exit" before registering the mapping.
1023 * If <b>ttl</b> is nonnegative, the mapping will be valid for
1024 * <b>ttl</b>seconds; otherwise, we use the default.
1027 client_dns_set_addressmap(const char *address
, uint32_t val
,
1028 const char *exitname
,
1032 char valbuf
[INET_NTOA_BUF_LEN
];
1034 tor_assert(address
);
1036 if (tor_inet_aton(address
, &in
))
1037 return; /* If address was an IP address already, don't add a mapping. */
1038 in
.s_addr
= htonl(val
);
1039 tor_inet_ntoa(&in
,valbuf
,sizeof(valbuf
));
1041 client_dns_set_addressmap_impl(address
, valbuf
, exitname
, ttl
);
1044 /** Add a cache entry noting that <b>address</b> (ordinarily a dotted quad)
1045 * resolved via a RESOLVE_PTR request to the hostname <b>v</b>.
1047 * If <b>exitname</b> is defined, then append the addresses with
1048 * ".exitname.exit" before registering the mapping.
1050 * If <b>ttl</b> is nonnegative, the mapping will be valid for
1051 * <b>ttl</b>seconds; otherwise, we use the default.
1054 client_dns_set_reverse_addressmap(const char *address
, const char *v
,
1055 const char *exitname
,
1058 size_t len
= strlen(address
) + 16;
1059 char *s
= tor_malloc(len
);
1060 tor_snprintf(s
, len
, "REVERSE[%s]", address
);
1061 client_dns_set_addressmap_impl(s
, v
, exitname
, ttl
);
1065 /* By default, we hand out 127.192.0.1 through 127.254.254.254.
1066 * These addresses should map to localhost, so even if the
1067 * application accidentally tried to connect to them directly (not
1068 * via Tor), it wouldn't get too far astray.
1070 * These options are configured by parse_virtual_addr_network().
1072 /** Which network should we use for virtual IPv4 addresses? Only the first
1073 * bits of this value are fixed. */
1074 static uint32_t virtual_addr_network
= 0x7fc00000u
;
1075 /** How many bits of <b>virtual_addr_network</b> are fixed? */
1076 static maskbits_t virtual_addr_netmask_bits
= 10;
1077 /** What's the next virtual address we will hand out? */
1078 static uint32_t next_virtual_addr
= 0x7fc00000u
;
1080 /** Read a netmask of the form 127.192.0.0/10 from "val", and check whether
1081 * it's a valid set of virtual addresses to hand out in response to MAPADDRESS
1082 * requests. Return 0 on success; set *msg (if provided) to a newly allocated
1083 * string and return -1 on failure. If validate_only is false, sets the
1084 * actual virtual address range to the parsed value. */
1086 parse_virtual_addr_network(const char *val
, int validate_only
,
1090 uint16_t port_min
, port_max
;
1093 if (parse_addr_and_port_range(val
, &addr
, &bits
, &port_min
, &port_max
)) {
1094 if (msg
) *msg
= tor_strdup("Error parsing VirtualAddressNetwork");
1098 if (port_min
!= 1 || port_max
!= 65535) {
1099 if (msg
) *msg
= tor_strdup("Can't specify ports on VirtualAddressNetwork");
1104 if (msg
) *msg
= tor_strdup("VirtualAddressNetwork expects a /16 "
1105 "network or larger");
1112 virtual_addr_network
= (uint32_t)( addr
& (0xfffffffful
<< (32-bits
)) );
1113 virtual_addr_netmask_bits
= bits
;
1115 if (addr_mask_cmp_bits(next_virtual_addr
, addr
, bits
))
1116 next_virtual_addr
= addr
;
1122 * Return true iff <b>addr</b> is likely to have been returned by
1123 * client_dns_get_unused_address.
1126 address_is_in_virtual_range(const char *address
)
1129 tor_assert(address
);
1130 if (!strcasecmpend(address
, ".virtual")) {
1132 } else if (tor_inet_aton(address
, &in
)) {
1133 uint32_t addr
= ntohl(in
.s_addr
);
1134 if (!addr_mask_cmp_bits(addr
, virtual_addr_network
,
1135 virtual_addr_netmask_bits
))
1141 /** Return a newly allocated string holding an address of <b>type</b>
1142 * (one of RESOLVED_TYPE_{IPV4|HOSTNAME}) that has not yet been mapped,
1143 * and that is very unlikely to be the address of any real host.
1146 addressmap_get_virtual_address(int type
)
1150 tor_assert(addressmap
);
1152 if (type
== RESOLVED_TYPE_HOSTNAME
) {
1155 crypto_rand(rand
, sizeof(rand
));
1156 base32_encode(buf
,sizeof(buf
),rand
,sizeof(rand
));
1157 strlcat(buf
, ".virtual", sizeof(buf
));
1158 } while (strmap_get(addressmap
, buf
));
1159 return tor_strdup(buf
);
1160 } else if (type
== RESOLVED_TYPE_IPV4
) {
1161 // This is an imperfect estimate of how many addresses are available, but
1163 uint32_t available
= 1u << (32-virtual_addr_netmask_bits
);
1165 /* Don't hand out any .0 or .255 address. */
1166 while ((next_virtual_addr
& 0xff) == 0 ||
1167 (next_virtual_addr
& 0xff) == 0xff) {
1168 ++next_virtual_addr
;
1170 in
.s_addr
= htonl(next_virtual_addr
);
1171 tor_inet_ntoa(&in
, buf
, sizeof(buf
));
1172 if (!strmap_get(addressmap
, buf
)) {
1173 ++next_virtual_addr
;
1177 ++next_virtual_addr
;
1179 log_info(LD_CONFIG
, "%d addrs available", (int)available
);
1180 if (! --available
) {
1181 log_warn(LD_CONFIG
, "Ran out of virtual addresses!");
1184 if (addr_mask_cmp_bits(next_virtual_addr
, virtual_addr_network
,
1185 virtual_addr_netmask_bits
))
1186 next_virtual_addr
= virtual_addr_network
;
1188 return tor_strdup(buf
);
1190 log_warn(LD_BUG
, "Called with unsupported address type (%d)", type
);
1195 /** A controller has requested that we map some address of type
1196 * <b>type</b> to the address <b>new_address</b>. Choose an address
1197 * that is unlikely to be used, and map it, and return it in a newly
1198 * allocated string. If another address of the same type is already
1199 * mapped to <b>new_address</b>, try to return a copy of that address.
1201 * The string in <b>new_address</b> may be freed, or inserted into a map
1205 addressmap_register_virtual_address(int type
, char *new_address
)
1208 virtaddress_entry_t
*vent
;
1210 tor_assert(new_address
);
1211 tor_assert(addressmap
);
1212 tor_assert(virtaddress_reversemap
);
1214 vent
= strmap_get(virtaddress_reversemap
, new_address
);
1216 vent
= tor_malloc_zero(sizeof(virtaddress_entry_t
));
1217 strmap_set(virtaddress_reversemap
, new_address
, vent
);
1220 addrp
= (type
== RESOLVED_TYPE_IPV4
) ?
1221 &vent
->ipv4_address
: &vent
->hostname_address
;
1223 addressmap_entry_t
*ent
= strmap_get(addressmap
, *addrp
);
1224 if (ent
&& ent
->new_address
&&
1225 !strcasecmp(new_address
, ent
->new_address
)) {
1226 tor_free(new_address
);
1227 return tor_strdup(*addrp
);
1230 "Internal confusion: I thought that '%s' was mapped to by "
1231 "'%s', but '%s' really maps to '%s'. This is a harmless bug.",
1232 safe_str(new_address
), safe_str(*addrp
), safe_str(*addrp
),
1233 ent
?safe_str(ent
->new_address
):"(nothing)");
1237 *addrp
= addressmap_get_virtual_address(type
);
1238 log_info(LD_APP
, "Registering map from %s to %s", *addrp
, new_address
);
1239 addressmap_register(*addrp
, new_address
, 2, ADDRMAPSRC_CONTROLLER
);
1243 /* Try to catch possible bugs */
1244 addressmap_entry_t
*ent
;
1245 ent
= strmap_get(addressmap
, *addrp
);
1247 tor_assert(!strcasecmp(ent
->new_address
,new_address
));
1248 vent
= strmap_get(virtaddress_reversemap
, new_address
);
1250 tor_assert(!strcasecmp(*addrp
,
1251 (type
== RESOLVED_TYPE_IPV4
) ?
1252 vent
->ipv4_address
: vent
->hostname_address
));
1253 log_info(LD_APP
, "Map from %s to %s okay.",
1254 safe_str(*addrp
),safe_str(new_address
));
1261 /** Return 1 if <b>address</b> has funny characters in it like colons. Return
1262 * 0 if it's fine, or if we're configured to allow it anyway. <b>client</b>
1263 * should be true if we're using this address as a client; false if we're
1264 * using it as a server.
1267 address_is_invalid_destination(const char *address
, int client
)
1270 if (get_options()->AllowNonRFC953Hostnames
)
1273 if (get_options()->ServerDNSAllowNonRFC953Hostnames
)
1278 if (TOR_ISALNUM(*address
) ||
1281 *address
== '_') /* Underscore is not allowed, but Windows does it
1282 * sometimes, just to thumb its nose at the IETF. */
1290 /** Iterate over all address mappings which have expiry times between
1291 * min_expires and max_expires, inclusive. If sl is provided, add an
1292 * "old-addr new-addr expiry" string to sl for each mapping, omitting
1293 * the expiry time if want_expiry is false. If sl is NULL, remove the
1297 addressmap_get_mappings(smartlist_t
*sl
, time_t min_expires
,
1298 time_t max_expires
, int want_expiry
)
1300 strmap_iter_t
*iter
;
1303 addressmap_entry_t
*val
;
1308 for (iter
= strmap_iter_init(addressmap
); !strmap_iter_done(iter
); ) {
1309 strmap_iter_get(iter
, &key
, &_val
);
1311 if (val
->expires
>= min_expires
&& val
->expires
<= max_expires
) {
1313 iter
= strmap_iter_next_rmv(addressmap
,iter
);
1314 addressmap_ent_remove(key
, val
);
1316 } else if (val
->new_address
) {
1317 size_t len
= strlen(key
)+strlen(val
->new_address
)+ISO_TIME_LEN
+5;
1318 char *line
= tor_malloc(len
);
1320 if (val
->expires
< 3 || val
->expires
== TIME_MAX
)
1321 tor_snprintf(line
, len
, "%s %s NEVER", key
, val
->new_address
);
1323 char time
[ISO_TIME_LEN
+1];
1324 format_iso_time(time
, val
->expires
);
1325 tor_snprintf(line
, len
, "%s %s \"%s\"", key
, val
->new_address
,
1329 tor_snprintf(line
, len
, "%s %s", key
, val
->new_address
);
1331 smartlist_add(sl
, line
);
1334 iter
= strmap_iter_next(addressmap
,iter
);
1338 /** Check if <b>conn</b> is using a dangerous port. Then warn and/or
1339 * reject depending on our config options. */
1341 consider_plaintext_ports(edge_connection_t
*conn
, uint16_t port
)
1343 or_options_t
*options
= get_options();
1344 int reject
= smartlist_string_num_isin(options
->RejectPlaintextPorts
, port
);
1346 if (smartlist_string_num_isin(options
->WarnPlaintextPorts
, port
)) {
1347 log_warn(LD_APP
, "Application request to port %d: this port is "
1348 "commonly used for unencrypted protocols. Please make sure "
1349 "you don't send anything you would mind the rest of the "
1350 "Internet reading!%s", port
, reject
? " Closing." : "");
1351 control_event_client_status(LOG_WARN
, "DANGEROUS_PORT PORT=%d RESULT=%s",
1352 port
, reject
? "REJECT" : "WARN");
1356 log_info(LD_APP
, "Port %d listed in RejectPlaintextPorts. Closing.", port
);
1357 connection_mark_unattached_ap(conn
, END_STREAM_REASON_ENTRYPOLICY
);
1364 /** How many times do we try connecting with an exit configured via
1365 * TrackHostExits before concluding that it won't work any more and trying a
1367 #define TRACKHOSTEXITS_RETRIES 5
1369 /** Connection <b>conn</b> just finished its socks handshake, or the
1370 * controller asked us to take care of it. If <b>circ</b> is defined,
1371 * then that's where we'll want to attach it. Otherwise we have to
1372 * figure it out ourselves.
1374 * First, parse whether it's a .exit address, remap it, and so on. Then
1375 * if it's for a general circuit, try to attach it to a circuit (or launch
1376 * one as needed), else if it's for a rendezvous circuit, fetch a
1377 * rendezvous descriptor first (or attach/launch a circuit if the
1378 * rendezvous descriptor is already here and fresh enough).
1380 * The stream will exit from the hop
1381 * indicated by <b>cpath</b>, or from the last hop in circ's cpath if
1382 * <b>cpath</b> is NULL.
1385 connection_ap_handshake_rewrite_and_attach(edge_connection_t
*conn
,
1386 origin_circuit_t
*circ
,
1387 crypt_path_t
*cpath
)
1389 socks_request_t
*socks
= conn
->socks_request
;
1390 hostname_type_t addresstype
;
1391 or_options_t
*options
= get_options();
1392 struct in_addr addr_tmp
;
1394 char orig_address
[MAX_SOCKS_ADDR_LEN
];
1395 time_t map_expires
= TIME_MAX
;
1396 int remapped_to_exit
= 0;
1397 time_t now
= time(NULL
);
1399 tor_strlower(socks
->address
); /* normalize it */
1400 strlcpy(orig_address
, socks
->address
, sizeof(orig_address
));
1401 log_debug(LD_APP
,"Client asked for %s:%d",
1402 safe_str(socks
->address
),
1405 if (socks
->command
== SOCKS_COMMAND_RESOLVE
&&
1406 !tor_inet_aton(socks
->address
, &addr_tmp
) &&
1407 options
->AutomapHostsOnResolve
&& options
->AutomapHostsSuffixes
) {
1408 SMARTLIST_FOREACH(options
->AutomapHostsSuffixes
, const char *, cp
,
1409 if (!strcasecmpend(socks
->address
, cp
)) {
1414 const char *new_addr
;
1415 new_addr
= addressmap_register_virtual_address(
1416 RESOLVED_TYPE_IPV4
, tor_strdup(socks
->address
));
1417 tor_assert(new_addr
);
1418 log_info(LD_APP
, "Automapping %s to %s",
1419 escaped_safe_str(socks
->address
), safe_str(new_addr
));
1420 strlcpy(socks
->address
, new_addr
, sizeof(socks
->address
));
1424 if (socks
->command
== SOCKS_COMMAND_RESOLVE_PTR
) {
1425 if (addressmap_rewrite_reverse(socks
->address
, sizeof(socks
->address
),
1427 char *result
= tor_strdup(socks
->address
);
1428 /* remember _what_ is supposed to have been resolved. */
1429 tor_snprintf(socks
->address
, sizeof(socks
->address
), "REVERSE[%s]",
1431 connection_ap_handshake_socks_resolved(conn
, RESOLVED_TYPE_HOSTNAME
,
1432 strlen(result
), result
, -1,
1434 connection_mark_unattached_ap(conn
,
1435 END_STREAM_REASON_DONE
|
1436 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1439 if (options
->ClientDNSRejectInternalAddresses
) {
1440 /* Don't let people try to do a reverse lookup on 10.0.0.1. */
1443 ok
= tor_addr_parse_reverse_lookup_name(
1444 &addr
, socks
->address
, AF_UNSPEC
, 1);
1445 if (ok
== 1 && tor_addr_is_internal(&addr
, 0)) {
1446 connection_ap_handshake_socks_resolved(conn
, RESOLVED_TYPE_ERROR
,
1447 0, NULL
, -1, TIME_MAX
);
1448 connection_mark_unattached_ap(conn
,
1449 END_STREAM_REASON_SOCKSPROTOCOL
|
1450 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1454 } else if (!automap
) {
1455 int started_without_chosen_exit
= strcasecmpend(socks
->address
, ".exit");
1456 /* For address map controls, remap the address. */
1457 if (addressmap_rewrite(socks
->address
, sizeof(socks
->address
),
1459 control_event_stream_status(conn
, STREAM_EVENT_REMAP
,
1460 REMAP_STREAM_SOURCE_CACHE
);
1461 if (started_without_chosen_exit
&&
1462 !strcasecmpend(socks
->address
, ".exit") &&
1463 map_expires
< TIME_MAX
)
1464 remapped_to_exit
= 1;
1468 if (!automap
&& address_is_in_virtual_range(socks
->address
)) {
1469 /* This address was probably handed out by client_dns_get_unmapped_address,
1470 * but the mapping was discarded for some reason. We *don't* want to send
1471 * the address through Tor; that's likely to fail, and may leak
1474 log_warn(LD_APP
,"Missing mapping for virtual address '%s'. Refusing.",
1475 socks
->address
); /* don't safe_str() this yet. */
1476 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INTERNAL
);
1480 /* Parse the address provided by SOCKS. Modify it in-place if it
1481 * specifies a hidden-service (.onion) or particular exit node (.exit).
1483 addresstype
= parse_extended_hostname(socks
->address
);
1485 if (addresstype
== BAD_HOSTNAME
) {
1486 log_warn(LD_APP
, "Invalid hostname %s; rejecting", socks
->address
);
1487 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1488 escaped(socks
->address
));
1489 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1493 if (addresstype
== EXIT_HOSTNAME
) {
1494 /* foo.exit -- modify conn->chosen_exit_node to specify the exit
1495 * node, and conn->address to hold only the address portion.*/
1496 char *s
= strrchr(socks
->address
,'.');
1497 tor_assert(!automap
);
1500 conn
->chosen_exit_name
= tor_strdup(s
+1);
1501 if (remapped_to_exit
) /* 5 tries before it expires the addressmap */
1502 conn
->chosen_exit_retries
= TRACKHOSTEXITS_RETRIES
;
1505 log_warn(LD_APP
,"Malformed exit address '%s.exit'. Refusing.",
1506 safe_str(socks
->address
));
1507 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1508 escaped(socks
->address
));
1509 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1514 conn
->chosen_exit_name
= tor_strdup(socks
->address
);
1515 r
= router_get_by_nickname(conn
->chosen_exit_name
, 1);
1516 *socks
->address
= 0;
1518 strlcpy(socks
->address
, r
->address
, sizeof(socks
->address
));
1521 "Unrecognized server in exit address '%s.exit'. Refusing.",
1522 safe_str(socks
->address
));
1523 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1529 if (addresstype
!= ONION_HOSTNAME
) {
1530 /* not a hidden-service request (i.e. normal or .exit) */
1531 if (address_is_invalid_destination(socks
->address
, 1)) {
1532 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1533 escaped(socks
->address
));
1535 "Destination '%s' seems to be an invalid hostname. Failing.",
1536 safe_str(socks
->address
));
1537 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1541 if (socks
->command
== SOCKS_COMMAND_RESOLVE
) {
1544 /* Reply to resolves immediately if we can. */
1545 if (strlen(socks
->address
) > RELAY_PAYLOAD_SIZE
) {
1546 log_warn(LD_APP
,"Address to be resolved is too large. Failing.");
1547 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1548 escaped(socks
->address
));
1549 connection_ap_handshake_socks_resolved(conn
,
1550 RESOLVED_TYPE_ERROR_TRANSIENT
,
1551 0,NULL
,-1,TIME_MAX
);
1552 connection_mark_unattached_ap(conn
,
1553 END_STREAM_REASON_SOCKSPROTOCOL
|
1554 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1557 if (tor_inet_aton(socks
->address
, &in
)) { /* see if it's an IP already */
1558 /* leave it in network order */
1560 /* remember _what_ is supposed to have been resolved. */
1561 strlcpy(socks
->address
, orig_address
, sizeof(socks
->address
));
1562 connection_ap_handshake_socks_resolved(conn
,RESOLVED_TYPE_IPV4
,4,
1563 (char*)&answer
,-1,map_expires
);
1564 connection_mark_unattached_ap(conn
,
1565 END_STREAM_REASON_DONE
|
1566 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1569 tor_assert(!automap
);
1570 rep_hist_note_used_resolve(now
); /* help predict this next time */
1571 } else if (socks
->command
== SOCKS_COMMAND_CONNECT
) {
1572 tor_assert(!automap
);
1573 if (socks
->port
== 0) {
1574 log_notice(LD_APP
,"Application asked to connect to port 0. Refusing.");
1575 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1579 if (!conn
->use_begindir
&& !conn
->chosen_exit_name
&& !circ
) {
1580 /* see if we can find a suitable enclave exit */
1582 router_find_exact_exit_enclave(socks
->address
, socks
->port
);
1585 "Redirecting address %s to exit at enclave router %s",
1586 safe_str(socks
->address
), r
->nickname
);
1587 /* use the hex digest, not nickname, in case there are two
1588 routers with this nickname */
1589 conn
->chosen_exit_name
=
1590 tor_strdup(hex_str(r
->cache_info
.identity_digest
, DIGEST_LEN
));
1591 conn
->chosen_exit_optional
= 1;
1595 /* warn or reject if it's using a dangerous port */
1596 if (!conn
->use_begindir
&& !conn
->chosen_exit_name
&& !circ
)
1597 if (consider_plaintext_ports(conn
, socks
->port
) < 0)
1600 if (!conn
->use_begindir
) {
1601 /* help predict this next time */
1602 rep_hist_note_used_port(now
, socks
->port
);
1604 } else if (socks
->command
== SOCKS_COMMAND_RESOLVE_PTR
) {
1605 rep_hist_note_used_resolve(now
); /* help predict this next time */
1606 /* no extra processing needed */
1608 tor_fragile_assert();
1610 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1611 if ((circ
&& connection_ap_handshake_attach_chosen_circuit(
1612 conn
, circ
, cpath
) < 0) ||
1614 connection_ap_handshake_attach_circuit(conn
) < 0)) {
1615 if (!conn
->_base
.marked_for_close
)
1616 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
1621 /* it's a hidden-service request */
1622 rend_cache_entry_t
*entry
;
1624 rend_service_authorization_t
*client_auth
;
1625 tor_assert(!automap
);
1626 if (SOCKS_COMMAND_IS_RESOLVE(socks
->command
)) {
1627 /* if it's a resolve request, fail it right now, rather than
1628 * building all the circuits and then realizing it won't work. */
1630 "Resolve requests to hidden services not allowed. Failing.");
1631 connection_ap_handshake_socks_resolved(conn
,RESOLVED_TYPE_ERROR
,
1632 0,NULL
,-1,TIME_MAX
);
1633 connection_mark_unattached_ap(conn
,
1634 END_STREAM_REASON_SOCKSPROTOCOL
|
1635 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1640 log_warn(LD_CONTROL
, "Attachstream to a circuit is not "
1641 "supported for .onion addresses currently. Failing.");
1642 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1646 conn
->rend_data
= tor_malloc_zero(sizeof(rend_data_t
));
1647 strlcpy(conn
->rend_data
->onion_address
, socks
->address
,
1648 sizeof(conn
->rend_data
->onion_address
));
1649 log_info(LD_REND
,"Got a hidden service request for ID '%s'",
1650 safe_str(conn
->rend_data
->onion_address
));
1651 /* see if we already have it cached */
1652 r
= rend_cache_lookup_entry(conn
->rend_data
->onion_address
, -1, &entry
);
1654 log_warn(LD_BUG
,"Invalid service name '%s'",
1655 safe_str(conn
->rend_data
->onion_address
));
1656 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1660 /* Help predict this next time. We're not sure if it will need
1661 * a stable circuit yet, but we know we'll need *something*. */
1662 rep_hist_note_used_internal(now
, 0, 1);
1664 /* Look up if we have client authorization for it. */
1665 client_auth
= rend_client_lookup_service_authorization(
1666 conn
->rend_data
->onion_address
);
1668 log_info(LD_REND
, "Using previously configured client authorization "
1669 "for hidden service request.");
1670 memcpy(conn
->rend_data
->descriptor_cookie
,
1671 client_auth
->descriptor_cookie
, REND_DESC_COOKIE_LEN
);
1672 conn
->rend_data
->auth_type
= client_auth
->auth_type
;
1675 conn
->_base
.state
= AP_CONN_STATE_RENDDESC_WAIT
;
1676 log_info(LD_REND
, "Unknown descriptor %s. Fetching.",
1677 safe_str(conn
->rend_data
->onion_address
));
1678 /* Fetch both, v0 and v2 rend descriptors in parallel. Use whichever
1679 * arrives first. Exception: When using client authorization, only
1680 * fetch v2 descriptors.*/
1681 rend_client_refetch_v2_renddesc(conn
->rend_data
);
1682 if (conn
->rend_data
->auth_type
== REND_NO_AUTH
)
1683 rend_client_refetch_renddesc(conn
->rend_data
->onion_address
);
1684 } else { /* r > 0 */
1685 /** How long after we receive a hidden service descriptor do we consider
1687 #define NUM_SECONDS_BEFORE_HS_REFETCH (60*15)
1688 if (now
- entry
->received
< NUM_SECONDS_BEFORE_HS_REFETCH
) {
1689 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1690 log_info(LD_REND
, "Descriptor is here and fresh enough. Great.");
1691 if (connection_ap_handshake_attach_circuit(conn
) < 0) {
1692 if (!conn
->_base
.marked_for_close
)
1693 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
1697 conn
->_base
.state
= AP_CONN_STATE_RENDDESC_WAIT
;
1698 log_info(LD_REND
, "Stale descriptor %s. Refetching.",
1699 safe_str(conn
->rend_data
->onion_address
));
1700 /* Fetch both, v0 and v2 rend descriptors in parallel. Use whichever
1701 * arrives first. Exception: When using client authorization, only
1702 * fetch v2 descriptors.*/
1703 rend_client_refetch_v2_renddesc(conn
->rend_data
);
1704 if (conn
->rend_data
->auth_type
== REND_NO_AUTH
)
1705 rend_client_refetch_renddesc(conn
->rend_data
->onion_address
);
1710 return 0; /* unreached but keeps the compiler happy */
1714 static int pf_socket
= -1;
1719 /* This should be opened before dropping privs. */
1724 /* only works on OpenBSD */
1725 pf
= open("/dev/pf", O_RDONLY
);
1727 /* works on NetBSD and FreeBSD */
1728 pf
= open("/dev/pf", O_RDWR
);
1732 log_warn(LD_NET
, "open(\"/dev/pf\") failed: %s", strerror(errno
));
1741 /** Fetch the original destination address and port from a
1742 * system-specific interface and put them into a
1743 * socks_request_t as if they came from a socks request.
1745 * Return -1 if an error prevents fetching the destination,
1749 connection_ap_get_original_destination(edge_connection_t
*conn
,
1750 socks_request_t
*req
)
1752 #ifdef TRANS_NETFILTER
1754 struct sockaddr_storage orig_dst
;
1755 socklen_t orig_dst_len
= sizeof(orig_dst
);
1758 if (getsockopt(conn
->_base
.s
, SOL_IP
, SO_ORIGINAL_DST
,
1759 (struct sockaddr
*)&orig_dst
, &orig_dst_len
) < 0) {
1760 int e
= tor_socket_errno(conn
->_base
.s
);
1761 log_warn(LD_NET
, "getsockopt() failed: %s", tor_socket_strerror(e
));
1765 tor_addr_from_sockaddr(&addr
, (struct sockaddr
*)&orig_dst
, &req
->port
);
1766 tor_addr_to_str(req
->address
, &addr
, sizeof(req
->address
), 0);
1769 #elif defined(TRANS_PF)
1770 struct sockaddr_storage proxy_addr
;
1771 socklen_t proxy_addr_len
= sizeof(proxy_addr
);
1772 struct sockaddr
*proxy_sa
= (struct sockaddr
*) &proxy_addr
;
1773 struct pfioc_natlook pnl
;
1777 if (getsockname(conn
->_base
.s
, (struct sockaddr
*)&proxy_addr
,
1778 &proxy_addr_len
) < 0) {
1779 int e
= tor_socket_errno(conn
->_base
.s
);
1780 log_warn(LD_NET
, "getsockname() to determine transocks destination "
1781 "failed: %s", tor_socket_strerror(e
));
1785 memset(&pnl
, 0, sizeof(pnl
));
1786 pnl
.proto
= IPPROTO_TCP
;
1787 pnl
.direction
= PF_OUT
;
1788 if (proxy_sa
->sa_family
== AF_INET
) {
1789 struct sockaddr_in
*sin
= (struct sockaddr_in
*)proxy_sa
;
1791 pnl
.saddr
.v4
.s_addr
= tor_addr_to_ipv4n(&conn
->_base
.addr
);
1792 pnl
.sport
= htons(conn
->_base
.port
);
1793 pnl
.daddr
.v4
.s_addr
= sin
->sin_addr
.s_addr
;
1794 pnl
.dport
= sin
->sin_port
;
1795 } else if (proxy_sa
->sa_family
== AF_INET6
) {
1796 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)proxy_sa
;
1798 memcpy(&pnl
.saddr
.v6
, tor_addr_to_in6(&conn
->_base
.addr
),
1799 sizeof(struct in6_addr
));
1800 pnl
.sport
= htons(conn
->_base
.port
);
1801 memcpy(&pnl
.daddr
.v6
, &sin6
->sin6_addr
, sizeof(struct in6_addr
));
1802 pnl
.dport
= sin6
->sin6_port
;
1804 log_warn(LD_NET
, "getsockname() gave an unexpected address family (%d)",
1805 (int)proxy_sa
->sa_family
);
1809 pf
= get_pf_socket();
1813 if (ioctl(pf
, DIOCNATLOOK
, &pnl
) < 0) {
1814 log_warn(LD_NET
, "ioctl(DIOCNATLOOK) failed: %s", strerror(errno
));
1818 if (pnl
.af
== AF_INET
) {
1819 tor_addr_from_ipv4n(&addr
, pnl
.rdaddr
.v4
.s_addr
);
1820 } else if (pnl
.af
== AF_INET6
) {
1821 tor_addr_from_in6(&addr
, &pnl
.rdaddr
.v6
);
1823 tor_fragile_assert();
1827 tor_addr_to_str(req
->address
, &addr
, sizeof(req
->address
), 0);
1828 req
->port
= ntohs(pnl
.rdport
);
1834 log_warn(LD_BUG
, "Called connection_ap_get_original_destination, but no "
1835 "transparent proxy method was configured.");
1840 /** connection_edge_process_inbuf() found a conn in state
1841 * socks_wait. See if conn->inbuf has the right bytes to proceed with
1842 * the socks handshake.
1844 * If the handshake is complete, send it to
1845 * connection_ap_handshake_rewrite_and_attach().
1847 * Return -1 if an unexpected error with conn occurs (and mark it for close),
1851 connection_ap_handshake_process_socks(edge_connection_t
*conn
)
1853 socks_request_t
*socks
;
1855 or_options_t
*options
= get_options();
1858 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
1859 tor_assert(conn
->_base
.state
== AP_CONN_STATE_SOCKS_WAIT
);
1860 tor_assert(conn
->socks_request
);
1861 socks
= conn
->socks_request
;
1863 log_debug(LD_APP
,"entered.");
1865 sockshere
= fetch_from_buf_socks(conn
->_base
.inbuf
, socks
,
1866 options
->TestSocks
, options
->SafeSocks
);
1867 if (sockshere
== 0) {
1868 if (socks
->replylen
) {
1869 connection_write_to_buf(socks
->reply
, socks
->replylen
, TO_CONN(conn
));
1870 /* zero it out so we can do another round of negotiation */
1871 socks
->replylen
= 0;
1873 log_debug(LD_APP
,"socks handshake not all here yet.");
1876 } else if (sockshere
== -1) {
1877 if (socks
->replylen
) { /* we should send reply back */
1878 log_debug(LD_APP
,"reply is already set for us. Using it.");
1879 connection_ap_handshake_socks_reply(conn
, socks
->reply
, socks
->replylen
,
1880 END_STREAM_REASON_SOCKSPROTOCOL
);
1883 log_warn(LD_APP
,"Fetching socks handshake failed. Closing.");
1884 connection_ap_handshake_socks_reply(conn
, NULL
, 0,
1885 END_STREAM_REASON_SOCKSPROTOCOL
);
1887 connection_mark_unattached_ap(conn
,
1888 END_STREAM_REASON_SOCKSPROTOCOL
|
1889 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1891 } /* else socks handshake is done, continue processing */
1893 if (hostname_is_noconnect_address(socks
->address
))
1895 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
1896 control_event_stream_status(conn
, STREAM_EVENT_CLOSED
, 0);
1897 connection_mark_unattached_ap(conn
, END_STREAM_REASON_DONE
);
1901 if (SOCKS_COMMAND_IS_CONNECT(socks
->command
))
1902 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
1904 control_event_stream_status(conn
, STREAM_EVENT_NEW_RESOLVE
, 0);
1906 if (options
->LeaveStreamsUnattached
) {
1907 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
1910 return connection_ap_handshake_rewrite_and_attach(conn
, NULL
, NULL
);
1913 /** connection_init_accepted_conn() found a new trans AP conn.
1914 * Get the original destination and send it to
1915 * connection_ap_handshake_rewrite_and_attach().
1917 * Return -1 if an unexpected error with conn (and it should be marked
1918 * for close), else return 0.
1921 connection_ap_process_transparent(edge_connection_t
*conn
)
1923 socks_request_t
*socks
;
1924 or_options_t
*options
= get_options();
1927 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
1928 tor_assert(conn
->socks_request
);
1929 socks
= conn
->socks_request
;
1931 /* pretend that a socks handshake completed so we don't try to
1932 * send a socks reply down a transparent conn */
1933 socks
->command
= SOCKS_COMMAND_CONNECT
;
1934 socks
->has_finished
= 1;
1936 log_debug(LD_APP
,"entered.");
1938 if (connection_ap_get_original_destination(conn
, socks
) < 0) {
1939 log_warn(LD_APP
,"Fetching original destination failed. Closing.");
1940 connection_mark_unattached_ap(conn
,
1941 END_STREAM_REASON_CANT_FETCH_ORIG_DEST
);
1944 /* we have the original destination */
1946 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
1948 if (options
->LeaveStreamsUnattached
) {
1949 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
1952 return connection_ap_handshake_rewrite_and_attach(conn
, NULL
, NULL
);
1955 /** connection_edge_process_inbuf() found a conn in state natd_wait. See if
1956 * conn-\>inbuf has the right bytes to proceed. See FreeBSD's libalias(3) and
1957 * ProxyEncodeTcpStream() in src/lib/libalias/alias_proxy.c for the encoding
1958 * form of the original destination.
1960 * If the original destination is complete, send it to
1961 * connection_ap_handshake_rewrite_and_attach().
1963 * Return -1 if an unexpected error with conn (and it should be marked
1964 * for close), else return 0.
1967 connection_ap_process_natd(edge_connection_t
*conn
)
1969 char tmp_buf
[36], *tbuf
, *daddr
;
1972 socks_request_t
*socks
;
1973 or_options_t
*options
= get_options();
1976 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
1977 tor_assert(conn
->_base
.state
== AP_CONN_STATE_NATD_WAIT
);
1978 tor_assert(conn
->socks_request
);
1979 socks
= conn
->socks_request
;
1981 log_debug(LD_APP
,"entered.");
1983 /* look for LF-terminated "[DEST ip_addr port]"
1984 * where ip_addr is a dotted-quad and port is in string form */
1985 err
= fetch_from_buf_line(conn
->_base
.inbuf
, tmp_buf
, &tlen
);
1989 log_warn(LD_APP
,"Natd handshake failed (DEST too long). Closing");
1990 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
1994 if (strcmpstart(tmp_buf
, "[DEST ")) {
1995 log_warn(LD_APP
,"Natd handshake was ill-formed; closing. The client "
1998 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2002 daddr
= tbuf
= &tmp_buf
[0] + 6; /* after end of "[DEST " */
2003 if (!(tbuf
= strchr(tbuf
, ' '))) {
2004 log_warn(LD_APP
,"Natd handshake was ill-formed; closing. The client "
2007 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2012 /* pretend that a socks handshake completed so we don't try to
2013 * send a socks reply down a natd conn */
2014 strlcpy(socks
->address
, daddr
, sizeof(socks
->address
));
2015 socks
->port
= (uint16_t)
2016 tor_parse_long(tbuf
, 10, 1, 65535, &port_ok
, &daddr
);
2018 log_warn(LD_APP
,"Natd handshake failed; port %s is ill-formed or out "
2019 "of range.", escaped(tbuf
));
2020 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2024 socks
->command
= SOCKS_COMMAND_CONNECT
;
2025 socks
->has_finished
= 1;
2027 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2029 if (options
->LeaveStreamsUnattached
) {
2030 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
2033 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
2035 return connection_ap_handshake_rewrite_and_attach(conn
, NULL
, NULL
);
2038 /** Iterate over the two bytes of stream_id until we get one that is not
2039 * already in use; return it. Return 0 if can't get a unique stream_id.
2042 get_unique_stream_id_by_circ(origin_circuit_t
*circ
)
2044 edge_connection_t
*tmpconn
;
2045 streamid_t test_stream_id
;
2046 uint32_t attempts
=0;
2049 test_stream_id
= circ
->next_stream_id
++;
2050 if (++attempts
> 1<<16) {
2051 /* Make sure we don't loop forever if all stream_id's are used. */
2052 log_warn(LD_APP
,"No unused stream IDs. Failing.");
2055 if (test_stream_id
== 0)
2057 for (tmpconn
= circ
->p_streams
; tmpconn
; tmpconn
=tmpconn
->next_stream
)
2058 if (tmpconn
->stream_id
== test_stream_id
)
2060 return test_stream_id
;
2063 /** Write a relay begin cell, using destaddr and destport from ap_conn's
2064 * socks_request field, and send it down circ.
2066 * If ap_conn is broken, mark it for close and return -1. Else return 0.
2069 connection_ap_handshake_send_begin(edge_connection_t
*ap_conn
)
2071 char payload
[CELL_PAYLOAD_SIZE
];
2074 origin_circuit_t
*circ
;
2075 tor_assert(ap_conn
->on_circuit
);
2076 circ
= TO_ORIGIN_CIRCUIT(ap_conn
->on_circuit
);
2078 tor_assert(ap_conn
->_base
.type
== CONN_TYPE_AP
);
2079 tor_assert(ap_conn
->_base
.state
== AP_CONN_STATE_CIRCUIT_WAIT
);
2080 tor_assert(ap_conn
->socks_request
);
2081 tor_assert(SOCKS_COMMAND_IS_CONNECT(ap_conn
->socks_request
->command
));
2083 ap_conn
->stream_id
= get_unique_stream_id_by_circ(circ
);
2084 if (ap_conn
->stream_id
==0) {
2085 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2086 circuit_mark_for_close(TO_CIRCUIT(circ
), END_CIRC_REASON_RESOURCELIMIT
);
2090 tor_snprintf(payload
,RELAY_PAYLOAD_SIZE
, "%s:%d",
2091 (circ
->_base
.purpose
== CIRCUIT_PURPOSE_C_GENERAL
) ?
2092 ap_conn
->socks_request
->address
: "",
2093 ap_conn
->socks_request
->port
);
2094 payload_len
= (int)strlen(payload
)+1;
2097 "Sending relay cell to begin stream %d.", ap_conn
->stream_id
);
2099 begin_type
= ap_conn
->use_begindir
?
2100 RELAY_COMMAND_BEGIN_DIR
: RELAY_COMMAND_BEGIN
;
2101 if (begin_type
== RELAY_COMMAND_BEGIN
) {
2102 tor_assert(circ
->build_state
->onehop_tunnel
== 0);
2105 if (connection_edge_send_command(ap_conn
, begin_type
,
2106 begin_type
== RELAY_COMMAND_BEGIN
? payload
: NULL
,
2107 begin_type
== RELAY_COMMAND_BEGIN
? payload_len
: 0) < 0)
2108 return -1; /* circuit is closed, don't continue */
2110 ap_conn
->package_window
= STREAMWINDOW_START
;
2111 ap_conn
->deliver_window
= STREAMWINDOW_START
;
2112 ap_conn
->_base
.state
= AP_CONN_STATE_CONNECT_WAIT
;
2113 log_info(LD_APP
,"Address/port sent, ap socket %d, n_circ_id %d",
2114 ap_conn
->_base
.s
, circ
->_base
.n_circ_id
);
2115 control_event_stream_status(ap_conn
, STREAM_EVENT_SENT_CONNECT
, 0);
2119 /** Write a relay resolve cell, using destaddr and destport from ap_conn's
2120 * socks_request field, and send it down circ.
2122 * If ap_conn is broken, mark it for close and return -1. Else return 0.
2125 connection_ap_handshake_send_resolve(edge_connection_t
*ap_conn
)
2127 int payload_len
, command
;
2128 const char *string_addr
;
2129 char inaddr_buf
[REVERSE_LOOKUP_NAME_BUF_LEN
];
2130 origin_circuit_t
*circ
;
2131 tor_assert(ap_conn
->on_circuit
);
2132 circ
= TO_ORIGIN_CIRCUIT(ap_conn
->on_circuit
);
2134 tor_assert(ap_conn
->_base
.type
== CONN_TYPE_AP
);
2135 tor_assert(ap_conn
->_base
.state
== AP_CONN_STATE_CIRCUIT_WAIT
);
2136 tor_assert(ap_conn
->socks_request
);
2137 tor_assert(circ
->_base
.purpose
== CIRCUIT_PURPOSE_C_GENERAL
);
2139 command
= ap_conn
->socks_request
->command
;
2140 tor_assert(SOCKS_COMMAND_IS_RESOLVE(command
));
2142 ap_conn
->stream_id
= get_unique_stream_id_by_circ(circ
);
2143 if (ap_conn
->stream_id
==0) {
2144 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2145 /*XXXX022 _close_ the circuit because it's full? That sounds dumb. */
2146 circuit_mark_for_close(TO_CIRCUIT(circ
), END_CIRC_REASON_RESOURCELIMIT
);
2150 if (command
== SOCKS_COMMAND_RESOLVE
) {
2151 string_addr
= ap_conn
->socks_request
->address
;
2152 payload_len
= (int)strlen(string_addr
)+1;
2154 /* command == SOCKS_COMMAND_RESOLVE_PTR */
2155 const char *a
= ap_conn
->socks_request
->address
;
2159 /* We're doing a reverse lookup. The input could be an IP address, or
2160 * could be an .in-addr.arpa or .ip6.arpa address */
2161 r
= tor_addr_parse_reverse_lookup_name(&addr
, a
, AF_INET
, 1);
2163 log_warn(LD_APP
, "Rejecting ill-formed reverse lookup of %s",
2165 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2169 r
= tor_addr_to_reverse_lookup_name(inaddr_buf
, sizeof(inaddr_buf
), &addr
);
2171 log_warn(LD_BUG
, "Couldn't generate reverse lookup hostname of %s",
2173 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2177 string_addr
= inaddr_buf
;
2178 payload_len
= (int)strlen(inaddr_buf
)+1;
2179 tor_assert(payload_len
<= (int)sizeof(inaddr_buf
));
2182 if (payload_len
> RELAY_PAYLOAD_SIZE
) {
2183 /* This should be impossible: we don't accept addresses this big. */
2184 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2189 "Sending relay cell to begin stream %d.", ap_conn
->stream_id
);
2191 if (connection_edge_send_command(ap_conn
,
2192 RELAY_COMMAND_RESOLVE
,
2193 string_addr
, payload_len
) < 0)
2194 return -1; /* circuit is closed, don't continue */
2196 tor_free(ap_conn
->_base
.address
); /* Maybe already set by dnsserv. */
2197 ap_conn
->_base
.address
= tor_strdup("(Tor_internal)");
2198 ap_conn
->_base
.state
= AP_CONN_STATE_RESOLVE_WAIT
;
2199 log_info(LD_APP
,"Address sent for resolve, ap socket %d, n_circ_id %d",
2200 ap_conn
->_base
.s
, circ
->_base
.n_circ_id
);
2201 control_event_stream_status(ap_conn
, STREAM_EVENT_NEW
, 0);
2202 control_event_stream_status(ap_conn
, STREAM_EVENT_SENT_RESOLVE
, 0);
2206 /** Make an AP connection_t, make a new linked connection pair, and attach
2207 * one side to the conn, connection_add it, initialize it to circuit_wait,
2208 * and call connection_ap_handshake_attach_circuit(conn) on it.
2210 * Return the other end of the linked connection pair, or -1 if error.
2213 connection_ap_make_link(char *address
, uint16_t port
,
2214 const char *digest
, int use_begindir
, int want_onehop
)
2216 edge_connection_t
*conn
;
2218 log_info(LD_APP
,"Making internal %s tunnel to %s:%d ...",
2219 want_onehop
? "direct" : "anonymized" , safe_str(address
),port
);
2221 conn
= edge_connection_new(CONN_TYPE_AP
, AF_INET
);
2222 conn
->_base
.linked
= 1; /* so that we can add it safely below. */
2224 /* populate conn->socks_request */
2226 /* leave version at zero, so the socks_reply is empty */
2227 conn
->socks_request
->socks_version
= 0;
2228 conn
->socks_request
->has_finished
= 0; /* waiting for 'connected' */
2229 strlcpy(conn
->socks_request
->address
, address
,
2230 sizeof(conn
->socks_request
->address
));
2231 conn
->socks_request
->port
= port
;
2232 conn
->socks_request
->command
= SOCKS_COMMAND_CONNECT
;
2233 conn
->want_onehop
= want_onehop
;
2234 conn
->use_begindir
= use_begindir
;
2236 conn
->chosen_exit_name
= tor_malloc(HEX_DIGEST_LEN
+2);
2237 conn
->chosen_exit_name
[0] = '$';
2239 base16_encode(conn
->chosen_exit_name
+1,HEX_DIGEST_LEN
+1,
2240 digest
, DIGEST_LEN
);
2243 conn
->_base
.address
= tor_strdup("(Tor_internal)");
2244 tor_addr_make_unspec(&conn
->_base
.addr
);
2245 conn
->_base
.port
= 0;
2247 if (connection_add(TO_CONN(conn
)) < 0) { /* no space, forget it */
2248 connection_free(TO_CONN(conn
));
2252 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
2254 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2256 /* attaching to a dirty circuit is fine */
2257 if (connection_ap_handshake_attach_circuit(conn
) < 0) {
2258 if (!conn
->_base
.marked_for_close
)
2259 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
2263 log_info(LD_APP
,"... application connection created and linked.");
2267 /** Notify any interested controller connections about a new hostname resolve
2268 * or resolve error. Takes the same arguments as does
2269 * connection_ap_handshake_socks_resolved(). */
2271 tell_controller_about_resolved_result(edge_connection_t
*conn
,
2279 if (ttl
>= 0 && (answer_type
== RESOLVED_TYPE_IPV4
||
2280 answer_type
== RESOLVED_TYPE_HOSTNAME
)) {
2281 return; /* we already told the controller. */
2282 } else if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
>= 4) {
2284 char buf
[INET_NTOA_BUF_LEN
];
2285 in
.s_addr
= get_uint32(answer
);
2286 tor_inet_ntoa(&in
, buf
, sizeof(buf
));
2287 control_event_address_mapped(conn
->socks_request
->address
,
2288 buf
, expires
, NULL
);
2289 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
<256) {
2290 char *cp
= tor_strndup(answer
, answer_len
);
2291 control_event_address_mapped(conn
->socks_request
->address
,
2295 control_event_address_mapped(conn
->socks_request
->address
,
2302 /** Send an answer to an AP connection that has requested a DNS lookup via
2303 * SOCKS. The type should be one of RESOLVED_TYPE_(IPV4|IPV6|HOSTNAME) or -1
2304 * for unreachable; the answer should be in the format specified in the socks
2305 * extensions document. <b>ttl</b> is the ttl for the answer, or -1 on
2306 * certain errors or for values that didn't come via DNS. <b>expires</b> is
2307 * a time when the answer expires, or -1 or TIME_MAX if there's a good TTL.
2309 /* XXXX022 the use of the ttl and expires fields is nutty. Let's make this
2310 * interface and those that use it less ugly. */
2312 connection_ap_handshake_socks_resolved(edge_connection_t
*conn
,
2323 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2324 uint32_t a
= ntohl(get_uint32(answer
));
2326 client_dns_set_addressmap(conn
->socks_request
->address
, a
,
2327 conn
->chosen_exit_name
, ttl
);
2328 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
< 256) {
2329 char *cp
= tor_strndup(answer
, answer_len
);
2330 client_dns_set_reverse_addressmap(conn
->socks_request
->address
,
2332 conn
->chosen_exit_name
, ttl
);
2337 if (conn
->is_dns_request
) {
2338 if (conn
->dns_server_request
) {
2339 /* We had a request on our DNS port: answer it. */
2340 dnsserv_resolved(conn
, answer_type
, answer_len
, answer
, ttl
);
2341 conn
->socks_request
->has_finished
= 1;
2344 /* This must be a request from the controller. We already sent
2345 * a mapaddress if there's a ttl. */
2346 tell_controller_about_resolved_result(conn
, answer_type
, answer_len
,
2347 answer
, ttl
, expires
);
2348 conn
->socks_request
->has_finished
= 1;
2351 /* We shouldn't need to free conn here; it gets marked by the caller. */
2354 if (conn
->socks_request
->socks_version
== 4) {
2355 buf
[0] = 0x00; /* version */
2356 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2357 buf
[1] = SOCKS4_GRANTED
;
2358 set_uint16(buf
+2, 0);
2359 memcpy(buf
+4, answer
, 4); /* address */
2360 replylen
= SOCKS4_NETWORK_LEN
;
2361 } else { /* "error" */
2362 buf
[1] = SOCKS4_REJECT
;
2363 memset(buf
+2, 0, 6);
2364 replylen
= SOCKS4_NETWORK_LEN
;
2366 } else if (conn
->socks_request
->socks_version
== 5) {
2368 buf
[0] = 0x05; /* version */
2369 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2370 buf
[1] = SOCKS5_SUCCEEDED
;
2371 buf
[2] = 0; /* reserved */
2372 buf
[3] = 0x01; /* IPv4 address type */
2373 memcpy(buf
+4, answer
, 4); /* address */
2374 set_uint16(buf
+8, 0); /* port == 0. */
2376 } else if (answer_type
== RESOLVED_TYPE_IPV6
&& answer_len
== 16) {
2377 buf
[1] = SOCKS5_SUCCEEDED
;
2378 buf
[2] = 0; /* reserved */
2379 buf
[3] = 0x04; /* IPv6 address type */
2380 memcpy(buf
+4, answer
, 16); /* address */
2381 set_uint16(buf
+20, 0); /* port == 0. */
2383 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
< 256) {
2384 buf
[1] = SOCKS5_SUCCEEDED
;
2385 buf
[2] = 0; /* reserved */
2386 buf
[3] = 0x03; /* Domainname address type */
2387 buf
[4] = (char)answer_len
;
2388 memcpy(buf
+5, answer
, answer_len
); /* address */
2389 set_uint16(buf
+5+answer_len
, 0); /* port == 0. */
2390 replylen
= 5+answer_len
+2;
2392 buf
[1] = SOCKS5_HOST_UNREACHABLE
;
2393 memset(buf
+2, 0, 8);
2397 /* no socks version info; don't send anything back */
2400 connection_ap_handshake_socks_reply(conn
, buf
, replylen
,
2401 (answer_type
== RESOLVED_TYPE_IPV4
||
2402 answer_type
== RESOLVED_TYPE_IPV6
) ?
2403 0 : END_STREAM_REASON_RESOLVEFAILED
);
2406 /** Send a socks reply to stream <b>conn</b>, using the appropriate
2407 * socks version, etc, and mark <b>conn</b> as completed with SOCKS
2410 * If <b>reply</b> is defined, then write <b>replylen</b> bytes of it to conn
2411 * and return, else reply based on <b>endreason</b> (one of
2412 * END_STREAM_REASON_*). If <b>reply</b> is undefined, <b>endreason</b> can't
2413 * be 0 or REASON_DONE. Send endreason to the controller, if appropriate.
2416 connection_ap_handshake_socks_reply(edge_connection_t
*conn
, char *reply
,
2417 size_t replylen
, int endreason
)
2420 socks5_reply_status_t status
=
2421 stream_end_reason_to_socks5_response(endreason
);
2423 tor_assert(conn
->socks_request
); /* make sure it's an AP stream */
2425 control_event_stream_status(conn
,
2426 status
==SOCKS5_SUCCEEDED
? STREAM_EVENT_SUCCEEDED
: STREAM_EVENT_FAILED
,
2429 if (conn
->socks_request
->has_finished
) {
2430 log_warn(LD_BUG
, "(Harmless.) duplicate calls to "
2431 "connection_ap_handshake_socks_reply.");
2434 if (replylen
) { /* we already have a reply in mind */
2435 connection_write_to_buf(reply
, replylen
, TO_CONN(conn
));
2436 conn
->socks_request
->has_finished
= 1;
2439 if (conn
->socks_request
->socks_version
== 4) {
2440 memset(buf
,0,SOCKS4_NETWORK_LEN
);
2441 buf
[1] = (status
==SOCKS5_SUCCEEDED
? SOCKS4_GRANTED
: SOCKS4_REJECT
);
2442 /* leave version, destport, destip zero */
2443 connection_write_to_buf(buf
, SOCKS4_NETWORK_LEN
, TO_CONN(conn
));
2444 } else if (conn
->socks_request
->socks_version
== 5) {
2445 buf
[0] = 5; /* version 5 */
2446 buf
[1] = (char)status
;
2448 buf
[3] = 1; /* ipv4 addr */
2449 memset(buf
+4,0,6); /* Set external addr/port to 0.
2450 The spec doesn't seem to say what to do here. -RD */
2451 connection_write_to_buf(buf
,10,TO_CONN(conn
));
2453 /* If socks_version isn't 4 or 5, don't send anything.
2454 * This can happen in the case of AP bridges. */
2455 conn
->socks_request
->has_finished
= 1;
2459 /** A relay 'begin' or 'begin_dir' cell has arrived, and either we are
2460 * an exit hop for the circuit, or we are the origin and it is a
2463 * Launch a new exit connection and initialize things appropriately.
2465 * If it's a rendezvous stream, call connection_exit_connect() on
2468 * For general streams, call dns_resolve() on it first, and only call
2469 * connection_exit_connect() if the dns answer is already known.
2471 * Note that we don't call connection_add() on the new stream! We wait
2472 * for connection_exit_connect() to do that.
2474 * Return -(some circuit end reason) if we want to tear down <b>circ</b>.
2478 connection_exit_begin_conn(cell_t
*cell
, circuit_t
*circ
)
2480 edge_connection_t
*n_stream
;
2484 or_circuit_t
*or_circ
= NULL
;
2486 assert_circuit_ok(circ
);
2487 if (!CIRCUIT_IS_ORIGIN(circ
))
2488 or_circ
= TO_OR_CIRCUIT(circ
);
2490 relay_header_unpack(&rh
, cell
->payload
);
2492 /* Note: we have to use relay_send_command_from_edge here, not
2493 * connection_edge_end or connection_edge_send_command, since those require
2494 * that we have a stream connected to a circuit, and we don't connect to a
2495 * circuit until we have a pending/successful resolve. */
2497 if (!server_mode(get_options()) &&
2498 circ
->purpose
!= CIRCUIT_PURPOSE_S_REND_JOINED
) {
2499 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2500 "Relay begin cell at non-server. Closing.");
2501 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2502 END_STREAM_REASON_EXITPOLICY
, NULL
);
2506 if (rh
.command
== RELAY_COMMAND_BEGIN
) {
2507 if (!memchr(cell
->payload
+RELAY_HEADER_SIZE
, 0, rh
.length
)) {
2508 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2509 "Relay begin cell has no \\0. Closing.");
2510 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2511 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2514 if (parse_addr_port(LOG_PROTOCOL_WARN
, cell
->payload
+RELAY_HEADER_SIZE
,
2515 &address
,NULL
,&port
)<0) {
2516 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2517 "Unable to parse addr:port in relay begin cell. Closing.");
2518 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2519 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2523 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2524 "Missing port in relay begin cell. Closing.");
2525 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2526 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2530 if (or_circ
&& or_circ
->is_first_hop
&&
2531 !get_options()->AllowSingleHopExits
) {
2532 /* Don't let clients use us as a single-hop proxy, unless the user
2533 * has explicitly allowed that in the config. It attracts attackers
2534 * and users who'd be better off with, well, single-hop proxies.
2536 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2537 "Attempt to open a stream on first hop of circuit. Closing.");
2538 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2539 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2543 } else if (rh
.command
== RELAY_COMMAND_BEGIN_DIR
) {
2544 if (!directory_permits_begindir_requests(get_options()) ||
2545 circ
->purpose
!= CIRCUIT_PURPOSE_OR
) {
2546 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2547 END_STREAM_REASON_NOTDIRECTORY
, NULL
);
2550 if (or_circ
&& or_circ
->p_conn
&& or_circ
->p_conn
->_base
.address
)
2551 address
= tor_strdup(or_circ
->p_conn
->_base
.address
);
2553 address
= tor_strdup("127.0.0.1");
2554 port
= 1; /* XXXX This value is never actually used anywhere, and there
2555 * isn't "really" a connection here. But we
2556 * need to set it to something nonzero. */
2558 log_warn(LD_BUG
, "Got an unexpected command %d", (int)rh
.command
);
2559 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2560 END_STREAM_REASON_INTERNAL
, NULL
);
2564 log_debug(LD_EXIT
,"Creating new exit connection.");
2565 n_stream
= edge_connection_new(CONN_TYPE_EXIT
, AF_INET
);
2566 n_stream
->_base
.purpose
= EXIT_PURPOSE_CONNECT
;
2568 n_stream
->stream_id
= rh
.stream_id
;
2569 n_stream
->_base
.port
= port
;
2570 /* leave n_stream->s at -1, because it's not yet valid */
2571 n_stream
->package_window
= STREAMWINDOW_START
;
2572 n_stream
->deliver_window
= STREAMWINDOW_START
;
2574 if (circ
->purpose
== CIRCUIT_PURPOSE_S_REND_JOINED
) {
2575 origin_circuit_t
*origin_circ
= TO_ORIGIN_CIRCUIT(circ
);
2576 log_info(LD_REND
,"begin is for rendezvous. configuring stream.");
2577 n_stream
->_base
.address
= tor_strdup("(rendezvous)");
2578 n_stream
->_base
.state
= EXIT_CONN_STATE_CONNECTING
;
2579 n_stream
->rend_data
= rend_data_dup(origin_circ
->rend_data
);
2580 tor_assert(connection_edge_is_rendezvous_stream(n_stream
));
2581 assert_circuit_ok(circ
);
2582 if (rend_service_set_connection_addr_port(n_stream
, origin_circ
) < 0) {
2583 log_info(LD_REND
,"Didn't find rendezvous service (port %d)",
2584 n_stream
->_base
.port
);
2585 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2586 END_STREAM_REASON_EXITPOLICY
,
2587 origin_circ
->cpath
->prev
);
2588 connection_free(TO_CONN(n_stream
));
2592 assert_circuit_ok(circ
);
2593 log_debug(LD_REND
,"Finished assigning addr/port");
2594 n_stream
->cpath_layer
= origin_circ
->cpath
->prev
; /* link it */
2596 /* add it into the linked list of n_streams on this circuit */
2597 n_stream
->next_stream
= origin_circ
->p_streams
;
2598 n_stream
->on_circuit
= circ
;
2599 origin_circ
->p_streams
= n_stream
;
2600 assert_circuit_ok(circ
);
2602 connection_exit_connect(n_stream
);
2606 tor_strlower(address
);
2607 n_stream
->_base
.address
= address
;
2608 n_stream
->_base
.state
= EXIT_CONN_STATE_RESOLVEFAILED
;
2609 /* default to failed, change in dns_resolve if it turns out not to fail */
2611 if (we_are_hibernating()) {
2612 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2613 END_STREAM_REASON_HIBERNATING
, NULL
);
2614 connection_free(TO_CONN(n_stream
));
2618 n_stream
->on_circuit
= circ
;
2620 if (rh
.command
== RELAY_COMMAND_BEGIN_DIR
) {
2621 tor_assert(or_circ
);
2622 if (or_circ
->p_conn
&& !tor_addr_is_null(&or_circ
->p_conn
->_base
.addr
))
2623 tor_addr_assign(&n_stream
->_base
.addr
, &or_circ
->p_conn
->_base
.addr
);
2624 return connection_exit_connect_dir(n_stream
);
2627 log_debug(LD_EXIT
,"about to start the dns_resolve().");
2629 /* send it off to the gethostbyname farm */
2630 switch (dns_resolve(n_stream
)) {
2631 case 1: /* resolve worked; now n_stream is attached to circ. */
2632 assert_circuit_ok(circ
);
2633 log_debug(LD_EXIT
,"about to call connection_exit_connect().");
2634 connection_exit_connect(n_stream
);
2636 case -1: /* resolve failed */
2637 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2638 END_STREAM_REASON_RESOLVEFAILED
, NULL
);
2639 /* n_stream got freed. don't touch it. */
2641 case 0: /* resolve added to pending list */
2642 assert_circuit_ok(circ
);
2649 * Called when we receive a RELAY_COMMAND_RESOLVE cell 'cell' along the
2650 * circuit <b>circ</b>;
2651 * begin resolving the hostname, and (eventually) reply with a RESOLVED cell.
2654 connection_exit_begin_resolve(cell_t
*cell
, or_circuit_t
*circ
)
2656 edge_connection_t
*dummy_conn
;
2659 assert_circuit_ok(TO_CIRCUIT(circ
));
2660 relay_header_unpack(&rh
, cell
->payload
);
2662 /* This 'dummy_conn' only exists to remember the stream ID
2663 * associated with the resolve request; and to make the
2664 * implementation of dns.c more uniform. (We really only need to
2665 * remember the circuit, the stream ID, and the hostname to be
2666 * resolved; but if we didn't store them in a connection like this,
2667 * the housekeeping in dns.c would get way more complicated.)
2669 dummy_conn
= edge_connection_new(CONN_TYPE_EXIT
, AF_INET
);
2670 dummy_conn
->stream_id
= rh
.stream_id
;
2671 dummy_conn
->_base
.address
= tor_strndup(cell
->payload
+RELAY_HEADER_SIZE
,
2673 dummy_conn
->_base
.port
= 0;
2674 dummy_conn
->_base
.state
= EXIT_CONN_STATE_RESOLVEFAILED
;
2675 dummy_conn
->_base
.purpose
= EXIT_PURPOSE_RESOLVE
;
2677 dummy_conn
->on_circuit
= TO_CIRCUIT(circ
);
2679 /* send it off to the gethostbyname farm */
2680 switch (dns_resolve(dummy_conn
)) {
2681 case -1: /* Impossible to resolve; a resolved cell was sent. */
2682 /* Connection freed; don't touch it. */
2684 case 1: /* The result was cached; a resolved cell was sent. */
2685 if (!dummy_conn
->_base
.marked_for_close
)
2686 connection_free(TO_CONN(dummy_conn
));
2688 case 0: /* resolve added to pending list */
2689 assert_circuit_ok(TO_CIRCUIT(circ
));
2695 /** Connect to conn's specified addr and port. If it worked, conn
2696 * has now been added to the connection_array.
2698 * Send back a connected cell. Include the resolved IP of the destination
2699 * address, but <em>only</em> if it's a general exit stream. (Rendezvous
2700 * streams must not reveal what IP they connected to.)
2703 connection_exit_connect(edge_connection_t
*edge_conn
)
2705 const tor_addr_t
*addr
;
2707 connection_t
*conn
= TO_CONN(edge_conn
);
2708 int socket_error
= 0;
2710 if (!connection_edge_is_rendezvous_stream(edge_conn
) &&
2711 router_compare_to_my_exit_policy(edge_conn
)) {
2712 log_info(LD_EXIT
,"%s:%d failed exit policy. Closing.",
2713 escaped_safe_str(conn
->address
), conn
->port
);
2714 connection_edge_end(edge_conn
, END_STREAM_REASON_EXITPOLICY
);
2715 circuit_detach_stream(circuit_get_by_edge_conn(edge_conn
), edge_conn
);
2716 connection_free(conn
);
2723 log_debug(LD_EXIT
,"about to try connecting");
2724 switch (connection_connect(conn
, conn
->address
, addr
, port
, &socket_error
)) {
2726 /* XXX021 use socket_error below rather than trying to piece things
2727 * together from the current errno, which may have been clobbered. */
2728 connection_edge_end_errno(edge_conn
);
2729 circuit_detach_stream(circuit_get_by_edge_conn(edge_conn
), edge_conn
);
2730 connection_free(conn
);
2733 conn
->state
= EXIT_CONN_STATE_CONNECTING
;
2735 connection_watch_events(conn
, EV_WRITE
| EV_READ
);
2736 /* writable indicates finish;
2737 * readable/error indicates broken link in windowsland. */
2739 /* case 1: fall through */
2742 conn
->state
= EXIT_CONN_STATE_OPEN
;
2743 if (connection_wants_to_flush(conn
)) {
2744 /* in case there are any queued data cells */
2745 log_warn(LD_BUG
,"newly connected conn had data waiting!");
2746 // connection_start_writing(conn);
2748 connection_watch_events(conn
, EV_READ
);
2750 /* also, deliver a 'connected' cell back through the circuit. */
2751 if (connection_edge_is_rendezvous_stream(edge_conn
)) {
2752 /* rendezvous stream */
2753 /* don't send an address back! */
2754 connection_edge_send_command(edge_conn
,
2755 RELAY_COMMAND_CONNECTED
,
2757 } else { /* normal stream */
2758 char connected_payload
[20];
2759 int connected_payload_len
;
2760 if (tor_addr_family(&conn
->addr
) == AF_INET
) {
2761 set_uint32(connected_payload
, tor_addr_to_ipv4n(&conn
->addr
));
2762 connected_payload_len
= 4;
2764 memcpy(connected_payload
, tor_addr_to_in6_addr8(&conn
->addr
), 16);
2765 connected_payload_len
= 16;
2767 set_uint32(connected_payload
+connected_payload_len
,
2768 htonl(dns_clip_ttl(edge_conn
->address_ttl
)));
2769 connected_payload_len
+= 4;
2770 connection_edge_send_command(edge_conn
,
2771 RELAY_COMMAND_CONNECTED
,
2772 connected_payload
, connected_payload_len
);
2776 /** Given an exit conn that should attach to us as a directory server, open a
2777 * bridge connection with a linked connection pair, create a new directory
2778 * conn, and join them together. Return 0 on success (or if there was an
2779 * error we could send back an end cell for). Return -(some circuit end
2780 * reason) if the circuit needs to be torn down. Either connects
2781 * <b>exitconn</b>, frees it, or marks it, as appropriate.
2784 connection_exit_connect_dir(edge_connection_t
*exitconn
)
2786 dir_connection_t
*dirconn
= NULL
;
2787 or_circuit_t
*circ
= TO_OR_CIRCUIT(exitconn
->on_circuit
);
2789 log_info(LD_EXIT
, "Opening local connection for anonymized directory exit");
2791 exitconn
->_base
.state
= EXIT_CONN_STATE_OPEN
;
2793 dirconn
= dir_connection_new(AF_INET
);
2795 dirconn
->_base
.addr
= exitconn
->_base
.addr
;
2796 dirconn
->_base
.port
= 0;
2797 dirconn
->_base
.address
= tor_strdup(circ
->p_conn
->_base
.address
);
2798 dirconn
->_base
.type
= CONN_TYPE_DIR
;
2799 dirconn
->_base
.purpose
= DIR_PURPOSE_SERVER
;
2800 dirconn
->_base
.state
= DIR_CONN_STATE_SERVER_COMMAND_WAIT
;
2802 connection_link_connections(TO_CONN(dirconn
), TO_CONN(exitconn
));
2804 if (connection_add(TO_CONN(exitconn
))<0) {
2805 connection_edge_end(exitconn
, END_STREAM_REASON_RESOURCELIMIT
);
2806 connection_free(TO_CONN(exitconn
));
2807 connection_free(TO_CONN(dirconn
));
2811 /* link exitconn to circ, now that we know we can use it. */
2812 exitconn
->next_stream
= circ
->n_streams
;
2813 circ
->n_streams
= exitconn
;
2815 if (connection_add(TO_CONN(dirconn
))<0) {
2816 connection_edge_end(exitconn
, END_STREAM_REASON_RESOURCELIMIT
);
2817 connection_close_immediate(TO_CONN(exitconn
));
2818 connection_mark_for_close(TO_CONN(exitconn
));
2819 connection_free(TO_CONN(dirconn
));
2823 connection_start_reading(TO_CONN(dirconn
));
2824 connection_start_reading(TO_CONN(exitconn
));
2826 if (connection_edge_send_command(exitconn
,
2827 RELAY_COMMAND_CONNECTED
, NULL
, 0) < 0) {
2828 connection_mark_for_close(TO_CONN(exitconn
));
2829 connection_mark_for_close(TO_CONN(dirconn
));
2836 /** Return 1 if <b>conn</b> is a rendezvous stream, or 0 if
2837 * it is a general stream.
2840 connection_edge_is_rendezvous_stream(edge_connection_t
*conn
)
2843 if (conn
->rend_data
)
2848 /** Return 1 if router <b>exit</b> is likely to allow stream <b>conn</b>
2849 * to exit from it, or 0 if it probably will not allow it.
2850 * (We might be uncertain if conn's destination address has not yet been
2854 connection_ap_can_use_exit(edge_connection_t
*conn
, routerinfo_t
*exit
)
2857 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
2858 tor_assert(conn
->socks_request
);
2861 /* If a particular exit node has been requested for the new connection,
2862 * make sure the exit node of the existing circuit matches exactly.
2864 if (conn
->chosen_exit_name
) {
2865 routerinfo_t
*chosen_exit
=
2866 router_get_by_nickname(conn
->chosen_exit_name
, 1);
2867 if (!chosen_exit
|| memcmp(chosen_exit
->cache_info
.identity_digest
,
2868 exit
->cache_info
.identity_digest
, DIGEST_LEN
)) {
2870 // log_debug(LD_APP,"Requested node '%s', considering node '%s'. No.",
2871 // conn->chosen_exit_name, exit->nickname);
2876 if (conn
->socks_request
->command
== SOCKS_COMMAND_CONNECT
&&
2877 !conn
->use_begindir
) {
2880 addr_policy_result_t r
;
2881 if (tor_inet_aton(conn
->socks_request
->address
, &in
))
2882 addr
= ntohl(in
.s_addr
);
2883 r
= compare_addr_to_addr_policy(addr
, conn
->socks_request
->port
,
2885 if (r
== ADDR_POLICY_REJECTED
)
2886 return 0; /* We know the address, and the exit policy rejects it. */
2887 if (r
== ADDR_POLICY_PROBABLY_REJECTED
&& !conn
->chosen_exit_name
)
2888 return 0; /* We don't know the addr, but the exit policy rejects most
2889 * addresses with this port. Since the user didn't ask for
2890 * this node, err on the side of caution. */
2891 } else if (SOCKS_COMMAND_IS_RESOLVE(conn
->socks_request
->command
)) {
2892 /* Can't support reverse lookups without eventdns. */
2893 if (conn
->socks_request
->command
== SOCKS_COMMAND_RESOLVE_PTR
&&
2894 exit
->has_old_dnsworkers
)
2897 /* Don't send DNS requests to non-exit servers by default. */
2898 if (!conn
->chosen_exit_name
&& policy_is_reject_star(exit
->exit_policy
))
2904 /** If address is of the form "y.onion" with a well-formed handle y:
2905 * Put a NUL after y, lower-case it, and return ONION_HOSTNAME.
2907 * If address is of the form "y.exit":
2908 * Put a NUL after y and return EXIT_HOSTNAME.
2911 * Return NORMAL_HOSTNAME and change nothing.
2914 parse_extended_hostname(char *address
)
2917 char query
[REND_SERVICE_ID_LEN_BASE32
+1];
2919 s
= strrchr(address
,'.');
2921 return NORMAL_HOSTNAME
; /* no dot, thus normal */
2922 if (!strcmp(s
+1,"exit")) {
2923 *s
= 0; /* nul-terminate it */
2924 return EXIT_HOSTNAME
; /* .exit */
2926 if (strcmp(s
+1,"onion"))
2927 return NORMAL_HOSTNAME
; /* neither .exit nor .onion, thus normal */
2929 /* so it is .onion */
2930 *s
= 0; /* nul-terminate it */
2931 if (strlcpy(query
, address
, REND_SERVICE_ID_LEN_BASE32
+1) >=
2932 REND_SERVICE_ID_LEN_BASE32
+1)
2934 if (rend_valid_service_id(query
)) {
2935 return ONION_HOSTNAME
; /* success */
2938 /* otherwise, return to previous state and return 0 */
2940 return BAD_HOSTNAME
;
2943 /** Check if the address is of the form "y.noconnect"
2946 hostname_is_noconnect_address(const char *address
)
2948 return ! strcasecmpend(address
, ".noconnect");