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 */
7 const char connection_edge_c_id
[] =
11 * \file connection_edge.c
12 * \brief Handle edge streams.
17 #ifdef HAVE_LINUX_TYPES_H
18 #include <linux/types.h>
20 #ifdef HAVE_LINUX_NETFILTER_IPV4_H
21 #include <linux/netfilter_ipv4.h>
22 #define TRANS_NETFILTER
25 #if defined(HAVE_NET_IF_H) && defined(HAVE_NET_PFVAR_H)
27 #include <net/pfvar.h>
31 #define SOCKS4_GRANTED 90
32 #define SOCKS4_REJECT 91
34 static int connection_ap_handshake_process_socks(edge_connection_t
*conn
);
35 static int connection_ap_process_natd(edge_connection_t
*conn
);
36 static int connection_exit_connect_dir(edge_connection_t
*exitconn
);
37 static int address_is_in_virtual_range(const char *addr
);
38 static int consider_plaintext_ports(edge_connection_t
*conn
, uint16_t port
);
39 static void clear_trackexithost_mappings(const char *exitname
);
41 /** An AP stream has failed/finished. If it hasn't already sent back
42 * a socks reply, send one now (based on endreason). Also set
43 * has_sent_end to 1, and mark the conn.
46 _connection_mark_unattached_ap(edge_connection_t
*conn
, int endreason
,
47 int line
, const char *file
)
49 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
50 conn
->edge_has_sent_end
= 1; /* no circ yet */
52 if (conn
->_base
.marked_for_close
) {
53 /* This call will warn as appropriate. */
54 _connection_mark_for_close(TO_CONN(conn
), line
, file
);
58 if (!conn
->socks_request
->has_finished
) {
59 if (endreason
& END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
)
61 "stream (marked at %s:%d) sending two socks replies?",
64 if (SOCKS_COMMAND_IS_CONNECT(conn
->socks_request
->command
))
65 connection_ap_handshake_socks_reply(conn
, NULL
, 0, endreason
);
66 else if (SOCKS_COMMAND_IS_RESOLVE(conn
->socks_request
->command
))
67 connection_ap_handshake_socks_resolved(conn
,
68 RESOLVED_TYPE_ERROR_TRANSIENT
,
70 else /* unknown or no handshake at all. send no response. */
71 conn
->socks_request
->has_finished
= 1;
74 _connection_mark_for_close(TO_CONN(conn
), line
, file
);
75 conn
->_base
.hold_open_until_flushed
= 1;
76 conn
->end_reason
= endreason
;
79 /** There was an EOF. Send an end and mark the connection for close.
82 connection_edge_reached_eof(edge_connection_t
*conn
)
84 if (buf_datalen(conn
->_base
.inbuf
) &&
85 connection_state_is_open(TO_CONN(conn
))) {
86 /* it still has stuff to process. don't let it die yet. */
89 log_info(LD_EDGE
,"conn (fd %d) reached eof. Closing.", conn
->_base
.s
);
90 if (!conn
->_base
.marked_for_close
) {
91 /* only mark it if not already marked. it's possible to
92 * get the 'end' right around when the client hangs up on us. */
93 connection_edge_end(conn
, END_STREAM_REASON_DONE
);
94 if (conn
->socks_request
) /* eof, so don't send a socks reply back */
95 conn
->socks_request
->has_finished
= 1;
96 connection_mark_for_close(TO_CONN(conn
));
101 /** Handle new bytes on conn->inbuf based on state:
102 * - If it's waiting for socks info, try to read another step of the
103 * socks handshake out of conn->inbuf.
104 * - If it's waiting for the original destination, fetch it.
105 * - If it's open, then package more relay cells from the stream.
106 * - Else, leave the bytes on inbuf alone for now.
108 * Mark and return -1 if there was an unexpected error with the conn,
112 connection_edge_process_inbuf(edge_connection_t
*conn
, int package_partial
)
116 switch (conn
->_base
.state
) {
117 case AP_CONN_STATE_SOCKS_WAIT
:
118 if (connection_ap_handshake_process_socks(conn
) < 0) {
123 case AP_CONN_STATE_NATD_WAIT
:
124 if (connection_ap_process_natd(conn
) < 0) {
129 case AP_CONN_STATE_OPEN
:
130 case EXIT_CONN_STATE_OPEN
:
131 if (connection_edge_package_raw_inbuf(conn
, package_partial
) < 0) {
132 /* (We already sent an end cell if possible) */
133 connection_mark_for_close(TO_CONN(conn
));
137 case EXIT_CONN_STATE_CONNECTING
:
138 case AP_CONN_STATE_RENDDESC_WAIT
:
139 case AP_CONN_STATE_CIRCUIT_WAIT
:
140 case AP_CONN_STATE_CONNECT_WAIT
:
141 case AP_CONN_STATE_RESOLVE_WAIT
:
142 case AP_CONN_STATE_CONTROLLER_WAIT
:
144 "data from edge while in '%s' state. Leaving it on buffer.",
145 conn_state_to_string(conn
->_base
.type
, conn
->_base
.state
));
148 log_warn(LD_BUG
,"Got unexpected state %d. Closing.",conn
->_base
.state
);
149 tor_fragile_assert();
150 connection_edge_end(conn
, END_STREAM_REASON_INTERNAL
);
151 connection_mark_for_close(TO_CONN(conn
));
155 /** This edge needs to be closed, because its circuit has closed.
156 * Mark it for close and return 0.
159 connection_edge_destroy(circid_t circ_id
, edge_connection_t
*conn
)
161 if (!conn
->_base
.marked_for_close
) {
163 "CircID %d: At an edge. Marking connection for close.", circ_id
);
164 if (conn
->_base
.type
== CONN_TYPE_AP
) {
165 connection_mark_unattached_ap(conn
, END_STREAM_REASON_DESTROY
);
166 control_event_stream_status(conn
, STREAM_EVENT_CLOSED
,
167 END_STREAM_REASON_DESTROY
);
168 conn
->end_reason
|= END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED
;
170 /* closing the circuit, nothing to send an END to */
171 conn
->edge_has_sent_end
= 1;
172 conn
->end_reason
= END_STREAM_REASON_DESTROY
;
173 conn
->end_reason
|= END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED
;
174 connection_mark_for_close(TO_CONN(conn
));
175 conn
->_base
.hold_open_until_flushed
= 1;
178 conn
->cpath_layer
= NULL
;
179 conn
->on_circuit
= NULL
;
183 /** Send a raw end cell to the stream with ID <b>stream_id</b> out over the
184 * <b>circ</b> towards the hop identified with <b>cpath_layer</b>. If this
185 * is not a client connection, set the relay end cell's reason for closing
186 * as <b>reason</b> */
188 relay_send_end_cell_from_edge(streamid_t stream_id
, circuit_t
*circ
,
189 uint8_t reason
, crypt_path_t
*cpath_layer
)
193 if (CIRCUIT_PURPOSE_IS_CLIENT(circ
->purpose
)) {
194 /* Never send the server an informative reason code; it doesn't need to
195 * know why the client stream is failing. */
196 reason
= END_STREAM_REASON_MISC
;
199 payload
[0] = (char) reason
;
201 return relay_send_command_from_edge(stream_id
, circ
, RELAY_COMMAND_END
,
202 payload
, 1, cpath_layer
);
205 /** Send a relay end cell from stream <b>conn</b> down conn's circuit, and
206 * remember that we've done so. If this is not a client connection, set the
207 * relay end cell's reason for closing as <b>reason</b>.
209 * Return -1 if this function has already been called on this conn,
213 connection_edge_end(edge_connection_t
*conn
, uint8_t reason
)
215 char payload
[RELAY_PAYLOAD_SIZE
];
216 size_t payload_len
=1;
219 if (conn
->edge_has_sent_end
) {
220 log_warn(LD_BUG
,"(Harmless.) Calling connection_edge_end (reason %d) "
221 "on an already ended stream?", reason
);
222 tor_fragile_assert();
226 if (conn
->_base
.marked_for_close
) {
228 "called on conn that's already marked for close at %s:%d.",
229 conn
->_base
.marked_for_close_file
, conn
->_base
.marked_for_close
);
233 circ
= circuit_get_by_edge_conn(conn
);
234 if (circ
&& CIRCUIT_PURPOSE_IS_CLIENT(circ
->purpose
)) {
235 /* If this is a client circuit, don't send the server an informative
236 * reason code; it doesn't need to know why the client stream is
238 reason
= END_STREAM_REASON_MISC
;
241 payload
[0] = (char)reason
;
242 if (reason
== END_STREAM_REASON_EXITPOLICY
&&
243 !connection_edge_is_rendezvous_stream(conn
)) {
245 if (tor_addr_family(&conn
->_base
.addr
) == AF_INET
) {
246 set_uint32(payload
+1, tor_addr_to_ipv4n(&conn
->_base
.addr
));
249 memcpy(payload
+1, tor_addr_to_in6_addr8(&conn
->_base
.addr
), 16);
252 set_uint32(payload
+1+addrlen
, htonl(dns_clip_ttl(conn
->address_ttl
)));
253 payload_len
+= 4+addrlen
;
256 if (circ
&& !circ
->marked_for_close
) {
257 log_debug(LD_EDGE
,"Sending end on conn (fd %d).",conn
->_base
.s
);
258 connection_edge_send_command(conn
, RELAY_COMMAND_END
,
259 payload
, payload_len
);
261 log_debug(LD_EDGE
,"No circ to send end on conn (fd %d).",
265 conn
->edge_has_sent_end
= 1;
266 conn
->end_reason
= reason
;
270 /** An error has just occured on an operation on an edge connection
271 * <b>conn</b>. Extract the errno; convert it to an end reason, and send an
272 * appropriate relay end cell to the other end of the connection's circuit.
275 connection_edge_end_errno(edge_connection_t
*conn
)
279 reason
= errno_to_stream_end_reason(tor_socket_errno(conn
->_base
.s
));
280 return connection_edge_end(conn
, reason
);
283 /** Connection <b>conn</b> has finished writing and has no bytes left on
286 * If it's in state 'open', stop writing, consider responding with a
287 * sendme, and return.
288 * Otherwise, stop writing and return.
290 * If <b>conn</b> is broken, mark it for close and return -1, else
294 connection_edge_finished_flushing(edge_connection_t
*conn
)
298 switch (conn
->_base
.state
) {
299 case AP_CONN_STATE_OPEN
:
300 case EXIT_CONN_STATE_OPEN
:
301 connection_stop_writing(TO_CONN(conn
));
302 connection_edge_consider_sending_sendme(conn
);
304 case AP_CONN_STATE_SOCKS_WAIT
:
305 case AP_CONN_STATE_NATD_WAIT
:
306 case AP_CONN_STATE_RENDDESC_WAIT
:
307 case AP_CONN_STATE_CIRCUIT_WAIT
:
308 case AP_CONN_STATE_CONNECT_WAIT
:
309 case AP_CONN_STATE_CONTROLLER_WAIT
:
310 connection_stop_writing(TO_CONN(conn
));
313 log_warn(LD_BUG
, "Called in unexpected state %d.",conn
->_base
.state
);
314 tor_fragile_assert();
320 /** Connected handler for exit connections: start writing pending
321 * data, deliver 'CONNECTED' relay cells as appropriate, and check
322 * any pending data that may have been received. */
324 connection_edge_finished_connecting(edge_connection_t
*edge_conn
)
328 tor_assert(edge_conn
);
329 tor_assert(edge_conn
->_base
.type
== CONN_TYPE_EXIT
);
330 conn
= TO_CONN(edge_conn
);
331 tor_assert(conn
->state
== EXIT_CONN_STATE_CONNECTING
);
333 log_info(LD_EXIT
,"Exit connection to %s:%u (%s) established.",
334 escaped_safe_str(conn
->address
),conn
->port
,
335 fmt_addr(&conn
->addr
));
337 conn
->state
= EXIT_CONN_STATE_OPEN
;
338 connection_watch_events(conn
, EV_READ
); /* stop writing, continue reading */
339 if (connection_wants_to_flush(conn
)) /* in case there are any queued relay
341 connection_start_writing(conn
);
342 /* deliver a 'connected' relay cell back through the circuit. */
343 if (connection_edge_is_rendezvous_stream(edge_conn
)) {
344 if (connection_edge_send_command(edge_conn
,
345 RELAY_COMMAND_CONNECTED
, NULL
, 0) < 0)
346 return 0; /* circuit is closed, don't continue */
348 char connected_payload
[20];
349 int connected_payload_len
;
350 if (tor_addr_family(&conn
->addr
) == AF_INET
) {
351 set_uint32(connected_payload
, tor_addr_to_ipv4n(&conn
->addr
));
352 set_uint32(connected_payload
+4,
353 htonl(dns_clip_ttl(edge_conn
->address_ttl
)));
354 connected_payload_len
= 8;
356 memcpy(connected_payload
, tor_addr_to_in6_addr8(&conn
->addr
), 16);
357 set_uint32(connected_payload
+16,
358 htonl(dns_clip_ttl(edge_conn
->address_ttl
)));
359 connected_payload_len
= 20;
361 if (connection_edge_send_command(edge_conn
,
362 RELAY_COMMAND_CONNECTED
,
363 connected_payload
, connected_payload_len
) < 0)
364 return 0; /* circuit is closed, don't continue */
366 tor_assert(edge_conn
->package_window
> 0);
367 /* in case the server has written anything */
368 return connection_edge_process_inbuf(edge_conn
, 1);
371 /** Define a schedule for how long to wait between retrying
372 * application connections. Rather than waiting a fixed amount of
373 * time between each retry, we wait 10 seconds each for the first
374 * two tries, and 15 seconds for each retry after
375 * that. Hopefully this will improve the expected user experience. */
377 compute_retry_timeout(edge_connection_t
*conn
)
379 if (conn
->num_socks_retries
< 2) /* try 0 and try 1 */
384 /** Find all general-purpose AP streams waiting for a response that sent their
385 * begin/resolve cell >=15 seconds ago. Detach from their current circuit, and
386 * mark their current circuit as unsuitable for new streams. Then call
387 * connection_ap_handshake_attach_circuit() to attach to a new circuit (if
388 * available) or launch a new one.
390 * For rendezvous streams, simply give up after SocksTimeout seconds (with no
394 connection_ap_expire_beginning(void)
396 edge_connection_t
*conn
;
398 time_t now
= time(NULL
);
399 or_options_t
*options
= get_options();
403 smartlist_t
*conns
= get_connection_array();
405 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, c
) {
406 if (c
->type
!= CONN_TYPE_AP
)
408 conn
= TO_EDGE_CONN(c
);
409 /* if it's an internal linked connection, don't yell its status. */
410 severity
= (tor_addr_is_null(&conn
->_base
.addr
) && !conn
->_base
.port
)
411 ? LOG_INFO
: LOG_NOTICE
;
412 seconds_idle
= (int)( now
- conn
->_base
.timestamp_lastread
);
414 if (AP_CONN_STATE_IS_UNATTACHED(conn
->_base
.state
)) {
415 if (seconds_idle
>= options
->SocksTimeout
) {
416 log_fn(severity
, LD_APP
,
417 "Tried for %d seconds to get a connection to %s:%d. "
419 seconds_idle
, safe_str(conn
->socks_request
->address
),
420 conn
->socks_request
->port
,
421 conn_state_to_string(CONN_TYPE_AP
, conn
->_base
.state
));
422 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TIMEOUT
);
427 if (conn
->_base
.state
== AP_CONN_STATE_OPEN
)
430 /* We're in state connect_wait or resolve_wait now -- waiting for a
431 * reply to our relay cell. See if we want to retry/give up. */
433 cutoff
= compute_retry_timeout(conn
);
434 if (seconds_idle
< cutoff
)
436 circ
= circuit_get_by_edge_conn(conn
);
437 if (!circ
) { /* it's vanished? */
438 log_info(LD_APP
,"Conn is waiting (address %s), but lost its circ.",
439 safe_str(conn
->socks_request
->address
));
440 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TIMEOUT
);
443 if (circ
->purpose
== CIRCUIT_PURPOSE_C_REND_JOINED
) {
444 if (seconds_idle
>= options
->SocksTimeout
) {
445 log_fn(severity
, LD_REND
,
446 "Rend stream is %d seconds late. Giving up on address"
449 safe_str(conn
->socks_request
->address
));
450 connection_edge_end(conn
, END_STREAM_REASON_TIMEOUT
);
451 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TIMEOUT
);
455 tor_assert(circ
->purpose
== CIRCUIT_PURPOSE_C_GENERAL
);
456 log_fn(cutoff
< 15 ? LOG_INFO
: severity
, LD_APP
,
457 "We tried for %d seconds to connect to '%s' using exit '%s'."
458 " Retrying on a new circuit.",
459 seconds_idle
, safe_str(conn
->socks_request
->address
),
461 conn
->cpath_layer
->extend_info
->nickname
: "*unnamed*");
462 /* send an end down the circuit */
463 connection_edge_end(conn
, END_STREAM_REASON_TIMEOUT
);
464 /* un-mark it as ending, since we're going to reuse it */
465 conn
->edge_has_sent_end
= 0;
466 conn
->end_reason
= 0;
467 /* kludge to make us not try this circuit again, yet to allow
468 * current streams on it to survive if they can: make it
469 * unattractive to use for new streams */
470 tor_assert(circ
->timestamp_dirty
);
471 circ
->timestamp_dirty
-= options
->MaxCircuitDirtiness
;
472 /* give our stream another 'cutoff' seconds to try */
473 conn
->_base
.timestamp_lastread
+= cutoff
;
474 if (conn
->num_socks_retries
< 250) /* avoid overflow */
475 conn
->num_socks_retries
++;
476 /* move it back into 'pending' state, and try to attach. */
477 if (connection_ap_detach_retriable(conn
, TO_ORIGIN_CIRCUIT(circ
),
478 END_STREAM_REASON_TIMEOUT
)<0) {
479 if (!conn
->_base
.marked_for_close
)
480 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
482 } SMARTLIST_FOREACH_END(conn
);
485 /** Tell any AP streams that are waiting for a new circuit to try again,
486 * either attaching to an available circ or launching a new one.
489 connection_ap_attach_pending(void)
491 edge_connection_t
*edge_conn
;
492 smartlist_t
*conns
= get_connection_array();
493 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
495 if (conn
->marked_for_close
||
496 conn
->type
!= CONN_TYPE_AP
||
497 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
499 edge_conn
= TO_EDGE_CONN(conn
);
500 if (connection_ap_handshake_attach_circuit(edge_conn
) < 0) {
501 if (!edge_conn
->_base
.marked_for_close
)
502 connection_mark_unattached_ap(edge_conn
,
503 END_STREAM_REASON_CANT_ATTACH
);
508 /** Tell any AP streams that are waiting for a onehop tunnel to
509 * <b>failed_digest</b> that they are going to fail. */
510 /* XXX021 We should get rid of this function, and instead attach
511 * onehop streams to circ->p_streams so they get marked in
512 * circuit_mark_for_close like normal p_streams. */
514 connection_ap_fail_onehop(const char *failed_digest
,
515 cpath_build_state_t
*build_state
)
517 edge_connection_t
*edge_conn
;
518 char digest
[DIGEST_LEN
];
519 smartlist_t
*conns
= get_connection_array();
520 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
521 if (conn
->marked_for_close
||
522 conn
->type
!= CONN_TYPE_AP
||
523 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
525 edge_conn
= TO_EDGE_CONN(conn
);
526 if (!edge_conn
->want_onehop
)
528 if (hexdigest_to_digest(edge_conn
->chosen_exit_name
, digest
) < 0 ||
529 memcmp(digest
, failed_digest
, DIGEST_LEN
))
531 if (tor_digest_is_zero(digest
)) {
532 /* we don't know the digest; have to compare addr:port */
534 if (!build_state
|| !build_state
->chosen_exit
||
535 !edge_conn
->socks_request
|| !edge_conn
->socks_request
->address
)
537 if (tor_addr_from_str(&addr
, edge_conn
->socks_request
->address
)<0 ||
538 !tor_addr_eq(&build_state
->chosen_exit
->addr
, &addr
) ||
539 build_state
->chosen_exit
->port
!= edge_conn
->socks_request
->port
)
542 log_info(LD_APP
, "Closing onehop stream to '%s/%s' because the OR conn "
543 "just failed.", edge_conn
->chosen_exit_name
,
544 edge_conn
->socks_request
->address
);
545 connection_mark_unattached_ap(edge_conn
, END_STREAM_REASON_TIMEOUT
);
546 } SMARTLIST_FOREACH_END(conn
);
549 /** A circuit failed to finish on its last hop <b>info</b>. If there
550 * are any streams waiting with this exit node in mind, but they
551 * don't absolutely require it, make them give up on it.
554 circuit_discard_optional_exit_enclaves(extend_info_t
*info
)
556 edge_connection_t
*edge_conn
;
557 routerinfo_t
*r1
, *r2
;
559 smartlist_t
*conns
= get_connection_array();
560 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
561 if (conn
->marked_for_close
||
562 conn
->type
!= CONN_TYPE_AP
||
563 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
565 edge_conn
= TO_EDGE_CONN(conn
);
566 if (!edge_conn
->chosen_exit_optional
&&
567 !edge_conn
->chosen_exit_retries
)
569 r1
= router_get_by_nickname(edge_conn
->chosen_exit_name
, 0);
570 r2
= router_get_by_nickname(info
->nickname
, 0);
571 if (!r1
|| !r2
|| r1
!= r2
)
573 tor_assert(edge_conn
->socks_request
);
574 if (edge_conn
->chosen_exit_optional
) {
575 log_info(LD_APP
, "Giving up on enclave exit '%s' for destination %s.",
576 safe_str(edge_conn
->chosen_exit_name
),
577 escaped_safe_str(edge_conn
->socks_request
->address
));
578 edge_conn
->chosen_exit_optional
= 0;
579 tor_free(edge_conn
->chosen_exit_name
); /* clears it */
580 /* if this port is dangerous, warn or reject it now that we don't
581 * think it'll be using an enclave. */
582 consider_plaintext_ports(edge_conn
, edge_conn
->socks_request
->port
);
584 if (edge_conn
->chosen_exit_retries
) {
585 if (--edge_conn
->chosen_exit_retries
== 0) { /* give up! */
586 clear_trackexithost_mappings(edge_conn
->chosen_exit_name
);
587 tor_free(edge_conn
->chosen_exit_name
); /* clears it */
588 /* if this port is dangerous, warn or reject it now that we don't
589 * think it'll be using an enclave. */
590 consider_plaintext_ports(edge_conn
, edge_conn
->socks_request
->port
);
593 } SMARTLIST_FOREACH_END(conn
);
596 /** The AP connection <b>conn</b> has just failed while attaching or
597 * sending a BEGIN or resolving on <b>circ</b>, but another circuit
598 * might work. Detach the circuit, and either reattach it, launch a
599 * new circuit, tell the controller, or give up as a appropriate.
601 * Returns -1 on err, 1 on success, 0 on not-yet-sure.
604 connection_ap_detach_retriable(edge_connection_t
*conn
, origin_circuit_t
*circ
,
607 control_event_stream_status(conn
, STREAM_EVENT_FAILED_RETRIABLE
, reason
);
608 conn
->_base
.timestamp_lastread
= time(NULL
);
609 if (!get_options()->LeaveStreamsUnattached
|| conn
->use_begindir
) {
610 /* If we're attaching streams ourself, or if this connection is
611 * a tunneled directory connection, then just attach it. */
612 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
613 circuit_detach_stream(TO_CIRCUIT(circ
),conn
);
614 return connection_ap_handshake_attach_circuit(conn
);
616 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
617 circuit_detach_stream(TO_CIRCUIT(circ
),conn
);
622 /** A client-side struct to remember requests to rewrite addresses
623 * to new addresses. These structs are stored in the hash table
624 * "addressmap" below.
626 * There are 5 ways to set an address mapping:
627 * - A MapAddress command from the controller [permanent]
628 * - An AddressMap directive in the torrc [permanent]
629 * - When a TrackHostExits torrc directive is triggered [temporary]
630 * - When a dns resolve succeeds [temporary]
631 * - When a dns resolve fails [temporary]
633 * When an addressmap request is made but one is already registered,
634 * the new one is replaced only if the currently registered one has
635 * no "new_address" (that is, it's in the process of dns resolve),
636 * or if the new one is permanent (expires==0 or 1).
638 * (We overload the 'expires' field, using "0" for mappings set via
639 * the configuration file, "1" for mappings set from the control
640 * interface, and other values for DNS and TrackHostExit mappings that can
646 addressmap_entry_source_t source
:3;
647 short num_resolve_failures
;
648 } addressmap_entry_t
;
650 /** Entry for mapping addresses to which virtual address we mapped them to. */
653 char *hostname_address
;
654 } virtaddress_entry_t
;
656 /** A hash table to store client-side address rewrite instructions. */
657 static strmap_t
*addressmap
=NULL
;
659 * Table mapping addresses to which virtual address, if any, we
662 * We maintain the following invariant: if [A,B] is in
663 * virtaddress_reversemap, then B must be a virtual address, and [A,B]
664 * must be in addressmap. We do not require that the converse hold:
665 * if it fails, then we could end up mapping two virtual addresses to
666 * the same address, which is no disaster.
668 static strmap_t
*virtaddress_reversemap
=NULL
;
670 /** Initialize addressmap. */
672 addressmap_init(void)
674 addressmap
= strmap_new();
675 virtaddress_reversemap
= strmap_new();
678 /** Free the memory associated with the addressmap entry <b>_ent</b>. */
680 addressmap_ent_free(void *_ent
)
682 addressmap_entry_t
*ent
= _ent
;
683 tor_free(ent
->new_address
);
687 /** Free storage held by a virtaddress_entry_t* entry in <b>ent</b>. */
689 addressmap_virtaddress_ent_free(void *_ent
)
691 virtaddress_entry_t
*ent
= _ent
;
692 tor_free(ent
->ipv4_address
);
693 tor_free(ent
->hostname_address
);
697 /** Free storage held by a virtaddress_entry_t* entry in <b>ent</b>. */
699 addressmap_virtaddress_remove(const char *address
, addressmap_entry_t
*ent
)
701 if (ent
&& ent
->new_address
&&
702 address_is_in_virtual_range(ent
->new_address
)) {
703 virtaddress_entry_t
*ve
=
704 strmap_get(virtaddress_reversemap
, ent
->new_address
);
705 /*log_fn(LOG_NOTICE,"remove reverse mapping for %s",ent->new_address);*/
707 if (!strcmp(address
, ve
->ipv4_address
))
708 tor_free(ve
->ipv4_address
);
709 if (!strcmp(address
, ve
->hostname_address
))
710 tor_free(ve
->hostname_address
);
711 if (!ve
->ipv4_address
&& !ve
->hostname_address
) {
713 strmap_remove(virtaddress_reversemap
, ent
->new_address
);
719 /** Remove <b>ent</b> (which must be mapped to by <b>address</b>) from the
720 * client address maps. */
722 addressmap_ent_remove(const char *address
, addressmap_entry_t
*ent
)
724 addressmap_virtaddress_remove(address
, ent
);
725 addressmap_ent_free(ent
);
728 /** Unregister all TrackHostExits mappings from any address to
729 * *.exitname.exit. */
731 clear_trackexithost_mappings(const char *exitname
)
735 if (!addressmap
|| !exitname
)
737 suffix_len
= strlen(exitname
) + 16;
738 suffix
= tor_malloc(suffix_len
);
739 tor_snprintf(suffix
, suffix_len
, ".%s.exit", exitname
);
740 tor_strlower(suffix
);
742 STRMAP_FOREACH_MODIFY(addressmap
, address
, addressmap_entry_t
*, ent
) {
743 if (ent
->source
== ADDRMAPSRC_TRACKEXIT
&& !strcmpend(address
, suffix
)) {
744 addressmap_ent_remove(address
, ent
);
745 MAP_DEL_CURRENT(address
);
747 } STRMAP_FOREACH_END
;
752 /** Remove all entries from the addressmap that were set via the
753 * configuration file or the command line. */
755 addressmap_clear_configured(void)
757 addressmap_get_mappings(NULL
, 0, 0, 0);
760 /** Remove all entries from the addressmap that are set to expire, ever. */
762 addressmap_clear_transient(void)
764 addressmap_get_mappings(NULL
, 2, TIME_MAX
, 0);
767 /** Clean out entries from the addressmap cache that were
768 * added long enough ago that they are no longer valid.
771 addressmap_clean(time_t now
)
773 addressmap_get_mappings(NULL
, 2, now
, 0);
776 /** Free all the elements in the addressmap, and free the addressmap
779 addressmap_free_all(void)
782 strmap_free(addressmap
, addressmap_ent_free
);
785 if (virtaddress_reversemap
) {
786 strmap_free(virtaddress_reversemap
, addressmap_virtaddress_ent_free
);
787 virtaddress_reversemap
= NULL
;
791 /** Look at address, and rewrite it until it doesn't want any
792 * more rewrites; but don't get into an infinite loop.
793 * Don't write more than maxlen chars into address. Return true if the
794 * address changed; false otherwise. Set *<b>expires_out</b> to the
795 * expiry time of the result, or to <b>time_max</b> if the result does
799 addressmap_rewrite(char *address
, size_t maxlen
, time_t *expires_out
)
801 addressmap_entry_t
*ent
;
804 time_t expires
= TIME_MAX
;
806 for (rewrites
= 0; rewrites
< 16; rewrites
++) {
807 ent
= strmap_get(addressmap
, address
);
809 if (!ent
|| !ent
->new_address
) {
811 *expires_out
= expires
;
812 return (rewrites
> 0); /* done, no rewrite needed */
815 cp
= tor_strdup(escaped_safe_str(ent
->new_address
));
816 log_info(LD_APP
, "Addressmap: rewriting %s to %s",
817 escaped_safe_str(address
), cp
);
818 if (ent
->expires
> 1 && ent
->expires
< expires
)
819 expires
= ent
->expires
;
821 strlcpy(address
, ent
->new_address
, maxlen
);
824 "Loop detected: we've rewritten %s 16 times! Using it as-is.",
825 escaped_safe_str(address
));
826 /* it's fine to rewrite a rewrite, but don't loop forever */
828 *expires_out
= TIME_MAX
;
832 /** If we have a cached reverse DNS entry for the address stored in the
833 * <b>maxlen</b>-byte buffer <b>address</b> (typically, a dotted quad) then
834 * rewrite to the cached value and return 1. Otherwise return 0. Set
835 * *<b>expires_out</b> to the expiry time of the result, or to <b>time_max</b>
836 * if the result does not expire. */
838 addressmap_rewrite_reverse(char *address
, size_t maxlen
, time_t *expires_out
)
840 size_t len
= maxlen
+ 16;
841 char *s
= tor_malloc(len
), *cp
;
842 addressmap_entry_t
*ent
;
844 tor_snprintf(s
, len
, "REVERSE[%s]", address
);
845 ent
= strmap_get(addressmap
, s
);
847 cp
= tor_strdup(escaped_safe_str(ent
->new_address
));
848 log_info(LD_APP
, "Rewrote reverse lookup %s -> %s",
849 escaped_safe_str(s
), cp
);
851 strlcpy(address
, ent
->new_address
, maxlen
);
856 *expires_out
= (ent
&& ent
->expires
> 1) ? ent
->expires
: TIME_MAX
;
862 /** Return 1 if <b>address</b> is already registered, else return 0. If address
863 * is already registered, and <b>update_expires</b> is non-zero, then update
864 * the expiry time on the mapping with update_expires if it is a
865 * mapping created by TrackHostExits. */
867 addressmap_have_mapping(const char *address
, int update_expiry
)
869 addressmap_entry_t
*ent
;
870 if (!(ent
=strmap_get_lc(addressmap
, address
)))
872 if (update_expiry
&& ent
->source
==ADDRMAPSRC_TRACKEXIT
)
873 ent
->expires
=time(NULL
) + update_expiry
;
877 /** Register a request to map <b>address</b> to <b>new_address</b>,
878 * which will expire on <b>expires</b> (or 0 if never expires from
879 * config file, 1 if never expires from controller, 2 if never expires
880 * (virtual address mapping) from the controller.)
882 * <b>new_address</b> should be a newly dup'ed string, which we'll use or
883 * free as appropriate. We will leave address alone.
885 * If <b>new_address</b> is NULL, or equal to <b>address</b>, remove
886 * any mappings that exist from <b>address</b>.
889 addressmap_register(const char *address
, char *new_address
, time_t expires
,
890 addressmap_entry_source_t source
)
892 addressmap_entry_t
*ent
;
894 ent
= strmap_get(addressmap
, address
);
895 if (!new_address
|| !strcasecmp(address
,new_address
)) {
896 /* Remove the mapping, if any. */
897 tor_free(new_address
);
899 addressmap_ent_remove(address
,ent
);
900 strmap_remove(addressmap
, address
);
904 if (!ent
) { /* make a new one and register it */
905 ent
= tor_malloc_zero(sizeof(addressmap_entry_t
));
906 strmap_set(addressmap
, address
, ent
);
907 } else if (ent
->new_address
) { /* we need to clean up the old mapping. */
909 log_info(LD_APP
,"Temporary addressmap ('%s' to '%s') not performed, "
910 "since it's already mapped to '%s'",
911 safe_str(address
), safe_str(new_address
), safe_str(ent
->new_address
));
912 tor_free(new_address
);
915 if (address_is_in_virtual_range(ent
->new_address
) &&
917 /* XXX This isn't the perfect test; we want to avoid removing
918 * mappings set from the control interface _as virtual mapping */
919 addressmap_virtaddress_remove(address
, ent
);
921 tor_free(ent
->new_address
);
922 } /* else { we have an in-progress resolve with no mapping. } */
924 ent
->new_address
= new_address
;
925 ent
->expires
= expires
==2 ? 1 : expires
;
926 ent
->num_resolve_failures
= 0;
927 ent
->source
= source
;
929 log_info(LD_CONFIG
, "Addressmap: (re)mapped '%s' to '%s'",
930 safe_str(address
), safe_str(ent
->new_address
));
931 control_event_address_mapped(address
, ent
->new_address
, expires
, NULL
);
934 /** An attempt to resolve <b>address</b> failed at some OR.
935 * Increment the number of resolve failures we have on record
936 * for it, and then return that number.
939 client_dns_incr_failures(const char *address
)
941 addressmap_entry_t
*ent
= strmap_get(addressmap
, address
);
943 ent
= tor_malloc_zero(sizeof(addressmap_entry_t
));
944 ent
->expires
= time(NULL
) + MAX_DNS_ENTRY_AGE
;
945 strmap_set(addressmap
,address
,ent
);
947 if (ent
->num_resolve_failures
< SHORT_MAX
)
948 ++ent
->num_resolve_failures
; /* don't overflow */
949 log_info(LD_APP
, "Address %s now has %d resolve failures.",
950 safe_str(address
), ent
->num_resolve_failures
);
951 return ent
->num_resolve_failures
;
954 /** If <b>address</b> is in the client dns addressmap, reset
955 * the number of resolve failures we have on record for it.
956 * This is used when we fail a stream because it won't resolve:
957 * otherwise future attempts on that address will only try once.
960 client_dns_clear_failures(const char *address
)
962 addressmap_entry_t
*ent
= strmap_get(addressmap
, address
);
964 ent
->num_resolve_failures
= 0;
967 /** Record the fact that <b>address</b> resolved to <b>name</b>.
968 * We can now use this in subsequent streams via addressmap_rewrite()
969 * so we can more correctly choose an exit that will allow <b>address</b>.
971 * If <b>exitname</b> is defined, then append the addresses with
972 * ".exitname.exit" before registering the mapping.
974 * If <b>ttl</b> is nonnegative, the mapping will be valid for
975 * <b>ttl</b>seconds; otherwise, we use the default.
978 client_dns_set_addressmap_impl(const char *address
, const char *name
,
979 const char *exitname
,
982 /* <address>.<hex or nickname>.exit\0 or just <address>\0 */
983 char extendedaddress
[MAX_SOCKS_ADDR_LEN
+MAX_VERBOSE_NICKNAME_LEN
+10];
984 /* 123.123.123.123.<hex or nickname>.exit\0 or just 123.123.123.123\0 */
985 char extendedval
[INET_NTOA_BUF_LEN
+MAX_VERBOSE_NICKNAME_LEN
+10];
991 ttl
= DEFAULT_DNS_TTL
;
993 ttl
= dns_clip_ttl(ttl
);
996 /* XXXX fails to ever get attempts to get an exit address of
997 * google.com.digest[=~]nickname.exit; we need a syntax for this that
998 * won't make strict RFC952-compliant applications (like us) barf. */
999 tor_snprintf(extendedaddress
, sizeof(extendedaddress
),
1000 "%s.%s.exit", address
, exitname
);
1001 tor_snprintf(extendedval
, sizeof(extendedval
),
1002 "%s.%s.exit", name
, exitname
);
1004 tor_snprintf(extendedaddress
, sizeof(extendedaddress
),
1006 tor_snprintf(extendedval
, sizeof(extendedval
),
1009 addressmap_register(extendedaddress
, tor_strdup(extendedval
),
1010 time(NULL
) + ttl
, ADDRMAPSRC_DNS
);
1013 /** Record the fact that <b>address</b> resolved to <b>val</b>.
1014 * We can now use this in subsequent streams via addressmap_rewrite()
1015 * so we can more correctly choose an exit that will allow <b>address</b>.
1017 * If <b>exitname</b> is defined, then append the addresses with
1018 * ".exitname.exit" before registering the mapping.
1020 * If <b>ttl</b> is nonnegative, the mapping will be valid for
1021 * <b>ttl</b>seconds; otherwise, we use the default.
1024 client_dns_set_addressmap(const char *address
, uint32_t val
,
1025 const char *exitname
,
1029 char valbuf
[INET_NTOA_BUF_LEN
];
1031 tor_assert(address
);
1033 if (tor_inet_aton(address
, &in
))
1034 return; /* If address was an IP address already, don't add a mapping. */
1035 in
.s_addr
= htonl(val
);
1036 tor_inet_ntoa(&in
,valbuf
,sizeof(valbuf
));
1038 client_dns_set_addressmap_impl(address
, valbuf
, exitname
, ttl
);
1041 /** Add a cache entry noting that <b>address</b> (ordinarily a dotted quad)
1042 * resolved via a RESOLVE_PTR request to the hostname <b>v</b>.
1044 * If <b>exitname</b> is defined, then append the addresses with
1045 * ".exitname.exit" before registering the mapping.
1047 * If <b>ttl</b> is nonnegative, the mapping will be valid for
1048 * <b>ttl</b>seconds; otherwise, we use the default.
1051 client_dns_set_reverse_addressmap(const char *address
, const char *v
,
1052 const char *exitname
,
1055 size_t len
= strlen(address
) + 16;
1056 char *s
= tor_malloc(len
);
1057 tor_snprintf(s
, len
, "REVERSE[%s]", address
);
1058 client_dns_set_addressmap_impl(s
, v
, exitname
, ttl
);
1062 /* By default, we hand out 127.192.0.1 through 127.254.254.254.
1063 * These addresses should map to localhost, so even if the
1064 * application accidentally tried to connect to them directly (not
1065 * via Tor), it wouldn't get too far astray.
1067 * These options are configured by parse_virtual_addr_network().
1069 /** Which network should we use for virtual IPv4 addresses? Only the first
1070 * bits of this value are fixed. */
1071 static uint32_t virtual_addr_network
= 0x7fc00000u
;
1072 /** How many bits of <b>virtual_addr_network</b> are fixed? */
1073 static maskbits_t virtual_addr_netmask_bits
= 10;
1074 /** What's the next virtual address we will hand out? */
1075 static uint32_t next_virtual_addr
= 0x7fc00000u
;
1077 /** Read a netmask of the form 127.192.0.0/10 from "val", and check whether
1078 * it's a valid set of virtual addresses to hand out in response to MAPADDRESS
1079 * requests. Return 0 on success; set *msg (if provided) to a newly allocated
1080 * string and return -1 on failure. If validate_only is false, sets the
1081 * actual virtual address range to the parsed value. */
1083 parse_virtual_addr_network(const char *val
, int validate_only
,
1087 uint16_t port_min
, port_max
;
1090 if (parse_addr_and_port_range(val
, &addr
, &bits
, &port_min
, &port_max
)) {
1091 if (msg
) *msg
= tor_strdup("Error parsing VirtualAddressNetwork");
1095 if (port_min
!= 1 || port_max
!= 65535) {
1096 if (msg
) *msg
= tor_strdup("Can't specify ports on VirtualAddressNetwork");
1101 if (msg
) *msg
= tor_strdup("VirtualAddressNetwork expects a /16 "
1102 "network or larger");
1109 virtual_addr_network
= (uint32_t)( addr
& (0xfffffffful
<< (32-bits
)) );
1110 virtual_addr_netmask_bits
= bits
;
1112 if (addr_mask_cmp_bits(next_virtual_addr
, addr
, bits
))
1113 next_virtual_addr
= addr
;
1119 * Return true iff <b>addr</b> is likely to have been returned by
1120 * client_dns_get_unused_address.
1123 address_is_in_virtual_range(const char *address
)
1126 tor_assert(address
);
1127 if (!strcasecmpend(address
, ".virtual")) {
1129 } else if (tor_inet_aton(address
, &in
)) {
1130 uint32_t addr
= ntohl(in
.s_addr
);
1131 if (!addr_mask_cmp_bits(addr
, virtual_addr_network
,
1132 virtual_addr_netmask_bits
))
1138 /** Return a newly allocated string holding an address of <b>type</b>
1139 * (one of RESOLVED_TYPE_{IPV4|HOSTNAME}) that has not yet been mapped,
1140 * and that is very unlikely to be the address of any real host.
1143 addressmap_get_virtual_address(int type
)
1147 tor_assert(addressmap
);
1149 if (type
== RESOLVED_TYPE_HOSTNAME
) {
1152 crypto_rand(rand
, sizeof(rand
));
1153 base32_encode(buf
,sizeof(buf
),rand
,sizeof(rand
));
1154 strlcat(buf
, ".virtual", sizeof(buf
));
1155 } while (strmap_get(addressmap
, buf
));
1156 return tor_strdup(buf
);
1157 } else if (type
== RESOLVED_TYPE_IPV4
) {
1158 // This is an imperfect estimate of how many addresses are available, but
1160 uint32_t available
= 1u << (32-virtual_addr_netmask_bits
);
1162 /* Don't hand out any .0 or .255 address. */
1163 while ((next_virtual_addr
& 0xff) == 0 ||
1164 (next_virtual_addr
& 0xff) == 0xff) {
1165 ++next_virtual_addr
;
1167 in
.s_addr
= htonl(next_virtual_addr
);
1168 tor_inet_ntoa(&in
, buf
, sizeof(buf
));
1169 if (!strmap_get(addressmap
, buf
)) {
1170 ++next_virtual_addr
;
1174 ++next_virtual_addr
;
1176 log_info(LD_CONFIG
, "%d addrs available", (int)available
);
1177 if (! --available
) {
1178 log_warn(LD_CONFIG
, "Ran out of virtual addresses!");
1181 if (addr_mask_cmp_bits(next_virtual_addr
, virtual_addr_network
,
1182 virtual_addr_netmask_bits
))
1183 next_virtual_addr
= virtual_addr_network
;
1185 return tor_strdup(buf
);
1187 log_warn(LD_BUG
, "Called with unsupported address type (%d)", type
);
1192 /** A controller has requested that we map some address of type
1193 * <b>type</b> to the address <b>new_address</b>. Choose an address
1194 * that is unlikely to be used, and map it, and return it in a newly
1195 * allocated string. If another address of the same type is already
1196 * mapped to <b>new_address</b>, try to return a copy of that address.
1198 * The string in <b>new_address</b> may be freed, or inserted into a map
1202 addressmap_register_virtual_address(int type
, char *new_address
)
1205 virtaddress_entry_t
*vent
;
1207 tor_assert(new_address
);
1208 tor_assert(addressmap
);
1209 tor_assert(virtaddress_reversemap
);
1211 vent
= strmap_get(virtaddress_reversemap
, new_address
);
1213 vent
= tor_malloc_zero(sizeof(virtaddress_entry_t
));
1214 strmap_set(virtaddress_reversemap
, new_address
, vent
);
1217 addrp
= (type
== RESOLVED_TYPE_IPV4
) ?
1218 &vent
->ipv4_address
: &vent
->hostname_address
;
1220 addressmap_entry_t
*ent
= strmap_get(addressmap
, *addrp
);
1221 if (ent
&& ent
->new_address
&&
1222 !strcasecmp(new_address
, ent
->new_address
)) {
1223 tor_free(new_address
);
1224 return tor_strdup(*addrp
);
1227 "Internal confusion: I thought that '%s' was mapped to by "
1228 "'%s', but '%s' really maps to '%s'. This is a harmless bug.",
1229 safe_str(new_address
), safe_str(*addrp
), safe_str(*addrp
),
1230 ent
?safe_str(ent
->new_address
):"(nothing)");
1234 *addrp
= addressmap_get_virtual_address(type
);
1235 log_info(LD_APP
, "Registering map from %s to %s", *addrp
, new_address
);
1236 addressmap_register(*addrp
, new_address
, 2, ADDRMAPSRC_CONTROLLER
);
1240 /* Try to catch possible bugs */
1241 addressmap_entry_t
*ent
;
1242 ent
= strmap_get(addressmap
, *addrp
);
1244 tor_assert(!strcasecmp(ent
->new_address
,new_address
));
1245 vent
= strmap_get(virtaddress_reversemap
, new_address
);
1247 tor_assert(!strcasecmp(*addrp
,
1248 (type
== RESOLVED_TYPE_IPV4
) ?
1249 vent
->ipv4_address
: vent
->hostname_address
));
1250 log_info(LD_APP
, "Map from %s to %s okay.",
1251 safe_str(*addrp
),safe_str(new_address
));
1258 /** Return 1 if <b>address</b> has funny characters in it like colons. Return
1259 * 0 if it's fine, or if we're configured to allow it anyway. <b>client</b>
1260 * should be true if we're using this address as a client; false if we're
1261 * using it as a server.
1264 address_is_invalid_destination(const char *address
, int client
)
1267 if (get_options()->AllowNonRFC953Hostnames
)
1270 if (get_options()->ServerDNSAllowNonRFC953Hostnames
)
1275 if (TOR_ISALNUM(*address
) ||
1278 *address
== '_') /* Underscore is not allowed, but Windows does it
1279 * sometimes, just to thumb its nose at the IETF. */
1287 /** Iterate over all address mappings which have expiry times between
1288 * min_expires and max_expires, inclusive. If sl is provided, add an
1289 * "old-addr new-addr expiry" string to sl for each mapping, omitting
1290 * the expiry time if want_expiry is false. If sl is NULL, remove the
1294 addressmap_get_mappings(smartlist_t
*sl
, time_t min_expires
,
1295 time_t max_expires
, int want_expiry
)
1297 strmap_iter_t
*iter
;
1300 addressmap_entry_t
*val
;
1305 for (iter
= strmap_iter_init(addressmap
); !strmap_iter_done(iter
); ) {
1306 strmap_iter_get(iter
, &key
, &_val
);
1308 if (val
->expires
>= min_expires
&& val
->expires
<= max_expires
) {
1310 iter
= strmap_iter_next_rmv(addressmap
,iter
);
1311 addressmap_ent_remove(key
, val
);
1313 } else if (val
->new_address
) {
1314 size_t len
= strlen(key
)+strlen(val
->new_address
)+ISO_TIME_LEN
+5;
1315 char *line
= tor_malloc(len
);
1317 if (val
->expires
< 3 || val
->expires
== TIME_MAX
)
1318 tor_snprintf(line
, len
, "%s %s NEVER", key
, val
->new_address
);
1320 char time
[ISO_TIME_LEN
+1];
1321 format_iso_time(time
, val
->expires
);
1322 tor_snprintf(line
, len
, "%s %s \"%s\"", key
, val
->new_address
,
1326 tor_snprintf(line
, len
, "%s %s", key
, val
->new_address
);
1328 smartlist_add(sl
, line
);
1331 iter
= strmap_iter_next(addressmap
,iter
);
1335 /** Check if <b>conn</b> is using a dangerous port. Then warn and/or
1336 * reject depending on our config options. */
1338 consider_plaintext_ports(edge_connection_t
*conn
, uint16_t port
)
1340 or_options_t
*options
= get_options();
1341 int reject
= smartlist_string_num_isin(options
->RejectPlaintextPorts
, port
);
1343 if (smartlist_string_num_isin(options
->WarnPlaintextPorts
, port
)) {
1344 log_warn(LD_APP
, "Application request to port %d: this port is "
1345 "commonly used for unencrypted protocols. Please make sure "
1346 "you don't send anything you would mind the rest of the "
1347 "Internet reading!%s", port
, reject
? " Closing." : "");
1348 control_event_client_status(LOG_WARN
, "DANGEROUS_PORT PORT=%d RESULT=%s",
1349 port
, reject
? "REJECT" : "WARN");
1353 log_info(LD_APP
, "Port %d listed in RejectPlaintextPorts. Closing.", port
);
1354 connection_mark_unattached_ap(conn
, END_STREAM_REASON_ENTRYPOLICY
);
1361 /** How many times do we try connecting with an exit configured via
1362 * TrackHostExits before concluding that it won't work any more and trying a
1364 #define TRACKHOSTEXITS_RETRIES 5
1366 /** Connection <b>conn</b> just finished its socks handshake, or the
1367 * controller asked us to take care of it. If <b>circ</b> is defined,
1368 * then that's where we'll want to attach it. Otherwise we have to
1369 * figure it out ourselves.
1371 * First, parse whether it's a .exit address, remap it, and so on. Then
1372 * if it's for a general circuit, try to attach it to a circuit (or launch
1373 * one as needed), else if it's for a rendezvous circuit, fetch a
1374 * rendezvous descriptor first (or attach/launch a circuit if the
1375 * rendezvous descriptor is already here and fresh enough).
1377 * The stream will exit from the hop
1378 * indicated by <b>cpath</b>, or from the last hop in circ's cpath if
1379 * <b>cpath</b> is NULL.
1382 connection_ap_handshake_rewrite_and_attach(edge_connection_t
*conn
,
1383 origin_circuit_t
*circ
,
1384 crypt_path_t
*cpath
)
1386 socks_request_t
*socks
= conn
->socks_request
;
1387 hostname_type_t addresstype
;
1388 or_options_t
*options
= get_options();
1389 struct in_addr addr_tmp
;
1391 char orig_address
[MAX_SOCKS_ADDR_LEN
];
1392 time_t map_expires
= TIME_MAX
;
1393 int remapped_to_exit
= 0;
1394 time_t now
= time(NULL
);
1396 tor_strlower(socks
->address
); /* normalize it */
1397 strlcpy(orig_address
, socks
->address
, sizeof(orig_address
));
1398 log_debug(LD_APP
,"Client asked for %s:%d",
1399 safe_str(socks
->address
),
1402 if (socks
->command
== SOCKS_COMMAND_RESOLVE
&&
1403 !tor_inet_aton(socks
->address
, &addr_tmp
) &&
1404 options
->AutomapHostsOnResolve
&& options
->AutomapHostsSuffixes
) {
1405 SMARTLIST_FOREACH(options
->AutomapHostsSuffixes
, const char *, cp
,
1406 if (!strcasecmpend(socks
->address
, cp
)) {
1411 const char *new_addr
;
1412 new_addr
= addressmap_register_virtual_address(
1413 RESOLVED_TYPE_IPV4
, tor_strdup(socks
->address
));
1414 tor_assert(new_addr
);
1415 log_info(LD_APP
, "Automapping %s to %s",
1416 escaped_safe_str(socks
->address
), safe_str(new_addr
));
1417 strlcpy(socks
->address
, new_addr
, sizeof(socks
->address
));
1421 if (socks
->command
== SOCKS_COMMAND_RESOLVE_PTR
) {
1422 if (addressmap_rewrite_reverse(socks
->address
, sizeof(socks
->address
),
1424 char *result
= tor_strdup(socks
->address
);
1425 /* remember _what_ is supposed to have been resolved. */
1426 tor_snprintf(socks
->address
, sizeof(socks
->address
), "REVERSE[%s]",
1428 connection_ap_handshake_socks_resolved(conn
, RESOLVED_TYPE_HOSTNAME
,
1429 strlen(result
), result
, -1,
1431 connection_mark_unattached_ap(conn
,
1432 END_STREAM_REASON_DONE
|
1433 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1436 if (options
->ClientDNSRejectInternalAddresses
) {
1437 /* Don't let people try to do a reverse lookup on 10.0.0.1. */
1440 ok
= tor_addr_parse_reverse_lookup_name(
1441 &addr
, socks
->address
, AF_UNSPEC
, 1);
1442 if (ok
== 1 && tor_addr_is_internal(&addr
, 0)) {
1443 connection_ap_handshake_socks_resolved(conn
, RESOLVED_TYPE_ERROR
,
1444 0, NULL
, -1, TIME_MAX
);
1445 connection_mark_unattached_ap(conn
,
1446 END_STREAM_REASON_SOCKSPROTOCOL
|
1447 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1451 } else if (!automap
) {
1452 int started_without_chosen_exit
= strcasecmpend(socks
->address
, ".exit");
1453 /* For address map controls, remap the address. */
1454 if (addressmap_rewrite(socks
->address
, sizeof(socks
->address
),
1456 control_event_stream_status(conn
, STREAM_EVENT_REMAP
,
1457 REMAP_STREAM_SOURCE_CACHE
);
1458 if (started_without_chosen_exit
&&
1459 !strcasecmpend(socks
->address
, ".exit") &&
1460 map_expires
< TIME_MAX
)
1461 remapped_to_exit
= 1;
1465 if (!automap
&& address_is_in_virtual_range(socks
->address
)) {
1466 /* This address was probably handed out by client_dns_get_unmapped_address,
1467 * but the mapping was discarded for some reason. We *don't* want to send
1468 * the address through Tor; that's likely to fail, and may leak
1471 log_warn(LD_APP
,"Missing mapping for virtual address '%s'. Refusing.",
1472 socks
->address
); /* don't safe_str() this yet. */
1473 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INTERNAL
);
1477 /* Parse the address provided by SOCKS. Modify it in-place if it
1478 * specifies a hidden-service (.onion) or particular exit node (.exit).
1480 addresstype
= parse_extended_hostname(socks
->address
);
1482 if (addresstype
== BAD_HOSTNAME
) {
1483 log_warn(LD_APP
, "Invalid hostname %s; rejecting", socks
->address
);
1484 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1485 escaped(socks
->address
));
1486 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1490 if (addresstype
== EXIT_HOSTNAME
) {
1491 /* foo.exit -- modify conn->chosen_exit_node to specify the exit
1492 * node, and conn->address to hold only the address portion.*/
1493 char *s
= strrchr(socks
->address
,'.');
1494 tor_assert(!automap
);
1497 conn
->chosen_exit_name
= tor_strdup(s
+1);
1498 if (remapped_to_exit
) /* 5 tries before it expires the addressmap */
1499 conn
->chosen_exit_retries
= TRACKHOSTEXITS_RETRIES
;
1502 log_warn(LD_APP
,"Malformed exit address '%s.exit'. Refusing.",
1503 safe_str(socks
->address
));
1504 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1505 escaped(socks
->address
));
1506 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1511 conn
->chosen_exit_name
= tor_strdup(socks
->address
);
1512 r
= router_get_by_nickname(conn
->chosen_exit_name
, 1);
1513 *socks
->address
= 0;
1515 strlcpy(socks
->address
, r
->address
, sizeof(socks
->address
));
1518 "Unrecognized server in exit address '%s.exit'. Refusing.",
1519 safe_str(socks
->address
));
1520 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1526 if (addresstype
!= ONION_HOSTNAME
) {
1527 /* not a hidden-service request (i.e. normal or .exit) */
1528 if (address_is_invalid_destination(socks
->address
, 1)) {
1529 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1530 escaped(socks
->address
));
1532 "Destination '%s' seems to be an invalid hostname. Failing.",
1533 safe_str(socks
->address
));
1534 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1538 if (socks
->command
== SOCKS_COMMAND_RESOLVE
) {
1541 /* Reply to resolves immediately if we can. */
1542 if (strlen(socks
->address
) > RELAY_PAYLOAD_SIZE
) {
1543 log_warn(LD_APP
,"Address to be resolved is too large. Failing.");
1544 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1545 escaped(socks
->address
));
1546 connection_ap_handshake_socks_resolved(conn
,
1547 RESOLVED_TYPE_ERROR_TRANSIENT
,
1548 0,NULL
,-1,TIME_MAX
);
1549 connection_mark_unattached_ap(conn
,
1550 END_STREAM_REASON_SOCKSPROTOCOL
|
1551 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1554 if (tor_inet_aton(socks
->address
, &in
)) { /* see if it's an IP already */
1555 /* leave it in network order */
1557 /* remember _what_ is supposed to have been resolved. */
1558 strlcpy(socks
->address
, orig_address
, sizeof(socks
->address
));
1559 connection_ap_handshake_socks_resolved(conn
,RESOLVED_TYPE_IPV4
,4,
1560 (char*)&answer
,-1,map_expires
);
1561 connection_mark_unattached_ap(conn
,
1562 END_STREAM_REASON_DONE
|
1563 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1566 tor_assert(!automap
);
1567 rep_hist_note_used_resolve(now
); /* help predict this next time */
1568 } else if (socks
->command
== SOCKS_COMMAND_CONNECT
) {
1569 tor_assert(!automap
);
1570 if (socks
->port
== 0) {
1571 log_notice(LD_APP
,"Application asked to connect to port 0. Refusing.");
1572 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1576 if (!conn
->use_begindir
&& !conn
->chosen_exit_name
&& !circ
) {
1577 /* see if we can find a suitable enclave exit */
1579 router_find_exact_exit_enclave(socks
->address
, socks
->port
);
1582 "Redirecting address %s to exit at enclave router %s",
1583 safe_str(socks
->address
), r
->nickname
);
1584 /* use the hex digest, not nickname, in case there are two
1585 routers with this nickname */
1586 conn
->chosen_exit_name
=
1587 tor_strdup(hex_str(r
->cache_info
.identity_digest
, DIGEST_LEN
));
1588 conn
->chosen_exit_optional
= 1;
1592 /* warn or reject if it's using a dangerous port */
1593 if (!conn
->use_begindir
&& !conn
->chosen_exit_name
&& !circ
)
1594 if (consider_plaintext_ports(conn
, socks
->port
) < 0)
1597 if (!conn
->use_begindir
) {
1598 /* help predict this next time */
1599 rep_hist_note_used_port(now
, socks
->port
);
1601 } else if (socks
->command
== SOCKS_COMMAND_RESOLVE_PTR
) {
1602 rep_hist_note_used_resolve(now
); /* help predict this next time */
1603 /* no extra processing needed */
1605 tor_fragile_assert();
1607 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1608 if ((circ
&& connection_ap_handshake_attach_chosen_circuit(
1609 conn
, circ
, cpath
) < 0) ||
1611 connection_ap_handshake_attach_circuit(conn
) < 0)) {
1612 if (!conn
->_base
.marked_for_close
)
1613 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
1618 /* it's a hidden-service request */
1619 rend_cache_entry_t
*entry
;
1621 rend_service_authorization_t
*client_auth
;
1622 tor_assert(!automap
);
1623 if (SOCKS_COMMAND_IS_RESOLVE(socks
->command
)) {
1624 /* if it's a resolve request, fail it right now, rather than
1625 * building all the circuits and then realizing it won't work. */
1627 "Resolve requests to hidden services not allowed. Failing.");
1628 connection_ap_handshake_socks_resolved(conn
,RESOLVED_TYPE_ERROR
,
1629 0,NULL
,-1,TIME_MAX
);
1630 connection_mark_unattached_ap(conn
,
1631 END_STREAM_REASON_SOCKSPROTOCOL
|
1632 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1637 log_warn(LD_CONTROL
, "Attachstream to a circuit is not "
1638 "supported for .onion addresses currently. Failing.");
1639 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1643 conn
->rend_data
= tor_malloc_zero(sizeof(rend_data_t
));
1644 strlcpy(conn
->rend_data
->onion_address
, socks
->address
,
1645 sizeof(conn
->rend_data
->onion_address
));
1646 log_info(LD_REND
,"Got a hidden service request for ID '%s'",
1647 safe_str(conn
->rend_data
->onion_address
));
1648 /* see if we already have it cached */
1649 r
= rend_cache_lookup_entry(conn
->rend_data
->onion_address
, -1, &entry
);
1651 log_warn(LD_BUG
,"Invalid service name '%s'",
1652 safe_str(conn
->rend_data
->onion_address
));
1653 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1657 /* Help predict this next time. We're not sure if it will need
1658 * a stable circuit yet, but we know we'll need *something*. */
1659 rep_hist_note_used_internal(now
, 0, 1);
1661 /* Look up if we have client authorization for it. */
1662 client_auth
= rend_client_lookup_service_authorization(
1663 conn
->rend_data
->onion_address
);
1665 log_info(LD_REND
, "Using previously configured client authorization "
1666 "for hidden service request.");
1667 memcpy(conn
->rend_data
->descriptor_cookie
,
1668 client_auth
->descriptor_cookie
, REND_DESC_COOKIE_LEN
);
1669 conn
->rend_data
->auth_type
= client_auth
->auth_type
;
1672 conn
->_base
.state
= AP_CONN_STATE_RENDDESC_WAIT
;
1673 log_info(LD_REND
, "Unknown descriptor %s. Fetching.",
1674 safe_str(conn
->rend_data
->onion_address
));
1675 /* Fetch both, v0 and v2 rend descriptors in parallel. Use whichever
1676 * arrives first. Exception: When using client authorization, only
1677 * fetch v2 descriptors.*/
1678 rend_client_refetch_v2_renddesc(conn
->rend_data
);
1679 if (conn
->rend_data
->auth_type
== REND_NO_AUTH
)
1680 rend_client_refetch_renddesc(conn
->rend_data
->onion_address
);
1681 } else { /* r > 0 */
1682 /** How long after we receive a hidden service descriptor do we consider
1684 #define NUM_SECONDS_BEFORE_HS_REFETCH (60*15)
1685 if (now
- entry
->received
< NUM_SECONDS_BEFORE_HS_REFETCH
) {
1686 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1687 log_info(LD_REND
, "Descriptor is here and fresh enough. Great.");
1688 if (connection_ap_handshake_attach_circuit(conn
) < 0) {
1689 if (!conn
->_base
.marked_for_close
)
1690 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
1694 conn
->_base
.state
= AP_CONN_STATE_RENDDESC_WAIT
;
1695 log_info(LD_REND
, "Stale descriptor %s. Refetching.",
1696 safe_str(conn
->rend_data
->onion_address
));
1697 /* Fetch both, v0 and v2 rend descriptors in parallel. Use whichever
1698 * arrives first. Exception: When using client authorization, only
1699 * fetch v2 descriptors.*/
1700 rend_client_refetch_v2_renddesc(conn
->rend_data
);
1701 if (conn
->rend_data
->auth_type
== REND_NO_AUTH
)
1702 rend_client_refetch_renddesc(conn
->rend_data
->onion_address
);
1707 return 0; /* unreached but keeps the compiler happy */
1711 static int pf_socket
= -1;
1716 /* This should be opened before dropping privs. */
1721 /* only works on OpenBSD */
1722 pf
= open("/dev/pf", O_RDONLY
);
1724 /* works on NetBSD and FreeBSD */
1725 pf
= open("/dev/pf", O_RDWR
);
1729 log_warn(LD_NET
, "open(\"/dev/pf\") failed: %s", strerror(errno
));
1738 /** Fetch the original destination address and port from a
1739 * system-specific interface and put them into a
1740 * socks_request_t as if they came from a socks request.
1742 * Return -1 if an error prevents fetching the destination,
1746 connection_ap_get_original_destination(edge_connection_t
*conn
,
1747 socks_request_t
*req
)
1749 #ifdef TRANS_NETFILTER
1751 struct sockaddr_storage orig_dst
;
1752 socklen_t orig_dst_len
= sizeof(orig_dst
);
1755 if (getsockopt(conn
->_base
.s
, SOL_IP
, SO_ORIGINAL_DST
,
1756 (struct sockaddr
*)&orig_dst
, &orig_dst_len
) < 0) {
1757 int e
= tor_socket_errno(conn
->_base
.s
);
1758 log_warn(LD_NET
, "getsockopt() failed: %s", tor_socket_strerror(e
));
1762 tor_addr_from_sockaddr(&addr
, (struct sockaddr
*)&orig_dst
, &req
->port
);
1763 tor_addr_to_str(req
->address
, &addr
, sizeof(req
->address
), 0);
1766 #elif defined(TRANS_PF)
1767 struct sockaddr_storage proxy_addr
;
1768 socklen_t proxy_addr_len
= sizeof(proxy_addr
);
1769 struct sockaddr
*proxy_sa
= (struct sockaddr
*) &proxy_addr
;
1770 struct pfioc_natlook pnl
;
1774 if (getsockname(conn
->_base
.s
, (struct sockaddr
*)&proxy_addr
,
1775 &proxy_addr_len
) < 0) {
1776 int e
= tor_socket_errno(conn
->_base
.s
);
1777 log_warn(LD_NET
, "getsockname() to determine transocks destination "
1778 "failed: %s", tor_socket_strerror(e
));
1782 memset(&pnl
, 0, sizeof(pnl
));
1783 pnl
.proto
= IPPROTO_TCP
;
1784 pnl
.direction
= PF_OUT
;
1785 if (proxy_sa
->sa_family
== AF_INET
) {
1786 struct sockaddr_in
*sin
= (struct sockaddr_in
*)proxy_sa
;
1788 pnl
.saddr
.v4
.s_addr
= tor_addr_to_ipv4n(&conn
->_base
.addr
);
1789 pnl
.sport
= htons(conn
->_base
.port
);
1790 pnl
.daddr
.v4
.s_addr
= sin
->sin_addr
.s_addr
;
1791 pnl
.dport
= sin
->sin_port
;
1792 } else if (proxy_sa
->sa_family
== AF_INET6
) {
1793 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)proxy_sa
;
1795 memcpy(&pnl
.saddr
.v6
, tor_addr_to_in6(&conn
->_base
.addr
),
1796 sizeof(struct in6_addr
));
1797 pnl
.sport
= htons(conn
->_base
.port
);
1798 memcpy(&pnl
.daddr
.v6
, &sin6
->sin6_addr
, sizeof(struct in6_addr
));
1799 pnl
.dport
= sin6
->sin6_port
;
1801 log_warn(LD_NET
, "getsockname() gave an unexpected address family (%d)",
1802 (int)proxy_sa
->sa_family
);
1806 pf
= get_pf_socket();
1810 if (ioctl(pf
, DIOCNATLOOK
, &pnl
) < 0) {
1811 log_warn(LD_NET
, "ioctl(DIOCNATLOOK) failed: %s", strerror(errno
));
1815 if (pnl
.af
== AF_INET
) {
1816 tor_addr_from_ipv4n(&addr
, pnl
.rdaddr
.v4
.s_addr
);
1817 } else if (pnl
.af
== AF_INET6
) {
1818 tor_addr_from_in6(&addr
, &pnl
.rdaddr
.v6
);
1820 tor_fragile_assert();
1824 tor_addr_to_str(req
->address
, &addr
, sizeof(req
->address
), 0);
1825 req
->port
= ntohs(pnl
.rdport
);
1831 log_warn(LD_BUG
, "Called connection_ap_get_original_destination, but no "
1832 "transparent proxy method was configured.");
1837 /** connection_edge_process_inbuf() found a conn in state
1838 * socks_wait. See if conn->inbuf has the right bytes to proceed with
1839 * the socks handshake.
1841 * If the handshake is complete, send it to
1842 * connection_ap_handshake_rewrite_and_attach().
1844 * Return -1 if an unexpected error with conn occurs (and mark it for close),
1848 connection_ap_handshake_process_socks(edge_connection_t
*conn
)
1850 socks_request_t
*socks
;
1852 or_options_t
*options
= get_options();
1855 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
1856 tor_assert(conn
->_base
.state
== AP_CONN_STATE_SOCKS_WAIT
);
1857 tor_assert(conn
->socks_request
);
1858 socks
= conn
->socks_request
;
1860 log_debug(LD_APP
,"entered.");
1862 sockshere
= fetch_from_buf_socks(conn
->_base
.inbuf
, socks
,
1863 options
->TestSocks
, options
->SafeSocks
);
1864 if (sockshere
== 0) {
1865 if (socks
->replylen
) {
1866 connection_write_to_buf(socks
->reply
, socks
->replylen
, TO_CONN(conn
));
1867 /* zero it out so we can do another round of negotiation */
1868 socks
->replylen
= 0;
1870 log_debug(LD_APP
,"socks handshake not all here yet.");
1873 } else if (sockshere
== -1) {
1874 if (socks
->replylen
) { /* we should send reply back */
1875 log_debug(LD_APP
,"reply is already set for us. Using it.");
1876 connection_ap_handshake_socks_reply(conn
, socks
->reply
, socks
->replylen
,
1877 END_STREAM_REASON_SOCKSPROTOCOL
);
1880 log_warn(LD_APP
,"Fetching socks handshake failed. Closing.");
1881 connection_ap_handshake_socks_reply(conn
, NULL
, 0,
1882 END_STREAM_REASON_SOCKSPROTOCOL
);
1884 connection_mark_unattached_ap(conn
,
1885 END_STREAM_REASON_SOCKSPROTOCOL
|
1886 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1888 } /* else socks handshake is done, continue processing */
1890 if (hostname_is_noconnect_address(socks
->address
))
1892 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
1893 control_event_stream_status(conn
, STREAM_EVENT_CLOSED
, 0);
1894 connection_mark_unattached_ap(conn
, END_STREAM_REASON_DONE
);
1898 if (SOCKS_COMMAND_IS_CONNECT(socks
->command
))
1899 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
1901 control_event_stream_status(conn
, STREAM_EVENT_NEW_RESOLVE
, 0);
1903 if (options
->LeaveStreamsUnattached
) {
1904 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
1907 return connection_ap_handshake_rewrite_and_attach(conn
, NULL
, NULL
);
1910 /** connection_init_accepted_conn() found a new trans AP conn.
1911 * Get the original destination and send it to
1912 * connection_ap_handshake_rewrite_and_attach().
1914 * Return -1 if an unexpected error with conn (and it should be marked
1915 * for close), else return 0.
1918 connection_ap_process_transparent(edge_connection_t
*conn
)
1920 socks_request_t
*socks
;
1921 or_options_t
*options
= get_options();
1924 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
1925 tor_assert(conn
->socks_request
);
1926 socks
= conn
->socks_request
;
1928 /* pretend that a socks handshake completed so we don't try to
1929 * send a socks reply down a transparent conn */
1930 socks
->command
= SOCKS_COMMAND_CONNECT
;
1931 socks
->has_finished
= 1;
1933 log_debug(LD_APP
,"entered.");
1935 if (connection_ap_get_original_destination(conn
, socks
) < 0) {
1936 log_warn(LD_APP
,"Fetching original destination failed. Closing.");
1937 connection_mark_unattached_ap(conn
,
1938 END_STREAM_REASON_CANT_FETCH_ORIG_DEST
);
1941 /* we have the original destination */
1943 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
1945 if (options
->LeaveStreamsUnattached
) {
1946 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
1949 return connection_ap_handshake_rewrite_and_attach(conn
, NULL
, NULL
);
1952 /** connection_edge_process_inbuf() found a conn in state natd_wait. See if
1953 * conn-\>inbuf has the right bytes to proceed. See FreeBSD's libalias(3) and
1954 * ProxyEncodeTcpStream() in src/lib/libalias/alias_proxy.c for the encoding
1955 * form of the original destination.
1957 * If the original destination is complete, send it to
1958 * connection_ap_handshake_rewrite_and_attach().
1960 * Return -1 if an unexpected error with conn (and it should be marked
1961 * for close), else return 0.
1964 connection_ap_process_natd(edge_connection_t
*conn
)
1966 char tmp_buf
[36], *tbuf
, *daddr
;
1969 socks_request_t
*socks
;
1970 or_options_t
*options
= get_options();
1973 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
1974 tor_assert(conn
->_base
.state
== AP_CONN_STATE_NATD_WAIT
);
1975 tor_assert(conn
->socks_request
);
1976 socks
= conn
->socks_request
;
1978 log_debug(LD_APP
,"entered.");
1980 /* look for LF-terminated "[DEST ip_addr port]"
1981 * where ip_addr is a dotted-quad and port is in string form */
1982 err
= fetch_from_buf_line(conn
->_base
.inbuf
, tmp_buf
, &tlen
);
1986 log_warn(LD_APP
,"Natd handshake failed (DEST too long). Closing");
1987 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
1991 if (strcmpstart(tmp_buf
, "[DEST ")) {
1992 log_warn(LD_APP
,"Natd handshake was ill-formed; closing. The client "
1995 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
1999 daddr
= tbuf
= &tmp_buf
[0] + 6; /* after end of "[DEST " */
2000 if (!(tbuf
= strchr(tbuf
, ' '))) {
2001 log_warn(LD_APP
,"Natd handshake was ill-formed; closing. The client "
2004 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2009 /* pretend that a socks handshake completed so we don't try to
2010 * send a socks reply down a natd conn */
2011 strlcpy(socks
->address
, daddr
, sizeof(socks
->address
));
2012 socks
->port
= (uint16_t)
2013 tor_parse_long(tbuf
, 10, 1, 65535, &port_ok
, &daddr
);
2015 log_warn(LD_APP
,"Natd handshake failed; port %s is ill-formed or out "
2016 "of range.", escaped(tbuf
));
2017 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2021 socks
->command
= SOCKS_COMMAND_CONNECT
;
2022 socks
->has_finished
= 1;
2024 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2026 if (options
->LeaveStreamsUnattached
) {
2027 conn
->_base
.state
= AP_CONN_STATE_CONTROLLER_WAIT
;
2030 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
2032 return connection_ap_handshake_rewrite_and_attach(conn
, NULL
, NULL
);
2035 /** Iterate over the two bytes of stream_id until we get one that is not
2036 * already in use; return it. Return 0 if can't get a unique stream_id.
2039 get_unique_stream_id_by_circ(origin_circuit_t
*circ
)
2041 edge_connection_t
*tmpconn
;
2042 streamid_t test_stream_id
;
2043 uint32_t attempts
=0;
2046 test_stream_id
= circ
->next_stream_id
++;
2047 if (++attempts
> 1<<16) {
2048 /* Make sure we don't loop forever if all stream_id's are used. */
2049 log_warn(LD_APP
,"No unused stream IDs. Failing.");
2052 if (test_stream_id
== 0)
2054 for (tmpconn
= circ
->p_streams
; tmpconn
; tmpconn
=tmpconn
->next_stream
)
2055 if (tmpconn
->stream_id
== test_stream_id
)
2057 return test_stream_id
;
2060 /** Write a relay begin cell, using destaddr and destport from ap_conn's
2061 * socks_request field, and send it down circ.
2063 * If ap_conn is broken, mark it for close and return -1. Else return 0.
2066 connection_ap_handshake_send_begin(edge_connection_t
*ap_conn
)
2068 char payload
[CELL_PAYLOAD_SIZE
];
2071 origin_circuit_t
*circ
;
2072 tor_assert(ap_conn
->on_circuit
);
2073 circ
= TO_ORIGIN_CIRCUIT(ap_conn
->on_circuit
);
2075 tor_assert(ap_conn
->_base
.type
== CONN_TYPE_AP
);
2076 tor_assert(ap_conn
->_base
.state
== AP_CONN_STATE_CIRCUIT_WAIT
);
2077 tor_assert(ap_conn
->socks_request
);
2078 tor_assert(SOCKS_COMMAND_IS_CONNECT(ap_conn
->socks_request
->command
));
2080 ap_conn
->stream_id
= get_unique_stream_id_by_circ(circ
);
2081 if (ap_conn
->stream_id
==0) {
2082 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2083 circuit_mark_for_close(TO_CIRCUIT(circ
), END_CIRC_REASON_RESOURCELIMIT
);
2087 tor_snprintf(payload
,RELAY_PAYLOAD_SIZE
, "%s:%d",
2088 (circ
->_base
.purpose
== CIRCUIT_PURPOSE_C_GENERAL
) ?
2089 ap_conn
->socks_request
->address
: "",
2090 ap_conn
->socks_request
->port
);
2091 payload_len
= (int)strlen(payload
)+1;
2094 "Sending relay cell to begin stream %d.", ap_conn
->stream_id
);
2096 begin_type
= ap_conn
->use_begindir
?
2097 RELAY_COMMAND_BEGIN_DIR
: RELAY_COMMAND_BEGIN
;
2098 if (begin_type
== RELAY_COMMAND_BEGIN
) {
2099 tor_assert(circ
->build_state
->onehop_tunnel
== 0);
2102 if (connection_edge_send_command(ap_conn
, begin_type
,
2103 begin_type
== RELAY_COMMAND_BEGIN
? payload
: NULL
,
2104 begin_type
== RELAY_COMMAND_BEGIN
? payload_len
: 0) < 0)
2105 return -1; /* circuit is closed, don't continue */
2107 ap_conn
->package_window
= STREAMWINDOW_START
;
2108 ap_conn
->deliver_window
= STREAMWINDOW_START
;
2109 ap_conn
->_base
.state
= AP_CONN_STATE_CONNECT_WAIT
;
2110 log_info(LD_APP
,"Address/port sent, ap socket %d, n_circ_id %d",
2111 ap_conn
->_base
.s
, circ
->_base
.n_circ_id
);
2112 control_event_stream_status(ap_conn
, STREAM_EVENT_SENT_CONNECT
, 0);
2116 /** Write a relay resolve cell, using destaddr and destport from ap_conn's
2117 * socks_request field, and send it down circ.
2119 * If ap_conn is broken, mark it for close and return -1. Else return 0.
2122 connection_ap_handshake_send_resolve(edge_connection_t
*ap_conn
)
2124 int payload_len
, command
;
2125 const char *string_addr
;
2126 char inaddr_buf
[REVERSE_LOOKUP_NAME_BUF_LEN
];
2127 origin_circuit_t
*circ
;
2128 tor_assert(ap_conn
->on_circuit
);
2129 circ
= TO_ORIGIN_CIRCUIT(ap_conn
->on_circuit
);
2131 tor_assert(ap_conn
->_base
.type
== CONN_TYPE_AP
);
2132 tor_assert(ap_conn
->_base
.state
== AP_CONN_STATE_CIRCUIT_WAIT
);
2133 tor_assert(ap_conn
->socks_request
);
2134 tor_assert(circ
->_base
.purpose
== CIRCUIT_PURPOSE_C_GENERAL
);
2136 command
= ap_conn
->socks_request
->command
;
2137 tor_assert(SOCKS_COMMAND_IS_RESOLVE(command
));
2139 ap_conn
->stream_id
= get_unique_stream_id_by_circ(circ
);
2140 if (ap_conn
->stream_id
==0) {
2141 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2142 circuit_mark_for_close(TO_CIRCUIT(circ
), END_CIRC_REASON_RESOURCELIMIT
);
2146 if (command
== SOCKS_COMMAND_RESOLVE
) {
2147 string_addr
= ap_conn
->socks_request
->address
;
2148 payload_len
= (int)strlen(string_addr
)+1;
2149 tor_assert(payload_len
<= RELAY_PAYLOAD_SIZE
);
2151 /* command == SOCKS_COMMAND_RESOLVE_PTR */
2152 const char *a
= ap_conn
->socks_request
->address
;
2156 /* We're doing a reverse lookup. The input could be an IP address, or
2157 * could be an .in-addr.arpa or .ip6.arpa address */
2158 r
= tor_addr_parse_reverse_lookup_name(&addr
, a
, AF_INET
, 1);
2160 log_warn(LD_APP
, "Rejecting ill-formed reverse lookup of %s",
2162 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2166 r
= tor_addr_to_reverse_lookup_name(inaddr_buf
, sizeof(inaddr_buf
), &addr
);
2168 log_warn(LD_BUG
, "Couldn't generate reverse lookup hostname of %s",
2170 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2174 string_addr
= inaddr_buf
;
2175 payload_len
= (int)strlen(inaddr_buf
)+1;
2176 tor_assert(payload_len
<= RELAY_PAYLOAD_SIZE
);
2180 "Sending relay cell to begin stream %d.", ap_conn
->stream_id
);
2182 if (connection_edge_send_command(ap_conn
,
2183 RELAY_COMMAND_RESOLVE
,
2184 string_addr
, payload_len
) < 0)
2185 return -1; /* circuit is closed, don't continue */
2187 tor_free(ap_conn
->_base
.address
); /* Maybe already set by dnsserv. */
2188 ap_conn
->_base
.address
= tor_strdup("(Tor_internal)");
2189 ap_conn
->_base
.state
= AP_CONN_STATE_RESOLVE_WAIT
;
2190 log_info(LD_APP
,"Address sent for resolve, ap socket %d, n_circ_id %d",
2191 ap_conn
->_base
.s
, circ
->_base
.n_circ_id
);
2192 control_event_stream_status(ap_conn
, STREAM_EVENT_NEW
, 0);
2193 control_event_stream_status(ap_conn
, STREAM_EVENT_SENT_RESOLVE
, 0);
2197 /** Make an AP connection_t, make a new linked connection pair, and attach
2198 * one side to the conn, connection_add it, initialize it to circuit_wait,
2199 * and call connection_ap_handshake_attach_circuit(conn) on it.
2201 * Return the other end of the linked connection pair, or -1 if error.
2204 connection_ap_make_link(char *address
, uint16_t port
,
2205 const char *digest
, int use_begindir
, int want_onehop
)
2207 edge_connection_t
*conn
;
2209 log_info(LD_APP
,"Making internal %s tunnel to %s:%d ...",
2210 want_onehop
? "direct" : "anonymized" , safe_str(address
),port
);
2212 conn
= edge_connection_new(CONN_TYPE_AP
, AF_INET
);
2213 conn
->_base
.linked
= 1; /* so that we can add it safely below. */
2215 /* populate conn->socks_request */
2217 /* leave version at zero, so the socks_reply is empty */
2218 conn
->socks_request
->socks_version
= 0;
2219 conn
->socks_request
->has_finished
= 0; /* waiting for 'connected' */
2220 strlcpy(conn
->socks_request
->address
, address
,
2221 sizeof(conn
->socks_request
->address
));
2222 conn
->socks_request
->port
= port
;
2223 conn
->socks_request
->command
= SOCKS_COMMAND_CONNECT
;
2224 conn
->want_onehop
= want_onehop
;
2225 conn
->use_begindir
= use_begindir
;
2227 conn
->chosen_exit_name
= tor_malloc(HEX_DIGEST_LEN
+2);
2228 conn
->chosen_exit_name
[0] = '$';
2230 base16_encode(conn
->chosen_exit_name
+1,HEX_DIGEST_LEN
+1,
2231 digest
, DIGEST_LEN
);
2234 conn
->_base
.address
= tor_strdup("(Tor_internal)");
2235 tor_addr_make_unspec(&conn
->_base
.addr
);
2236 conn
->_base
.port
= 0;
2238 if (connection_add(TO_CONN(conn
)) < 0) { /* no space, forget it */
2239 connection_free(TO_CONN(conn
));
2243 conn
->_base
.state
= AP_CONN_STATE_CIRCUIT_WAIT
;
2245 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2247 /* attaching to a dirty circuit is fine */
2248 if (connection_ap_handshake_attach_circuit(conn
) < 0) {
2249 if (!conn
->_base
.marked_for_close
)
2250 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
2254 log_info(LD_APP
,"... application connection created and linked.");
2258 /** Notify any interested controller connections about a new hostname resolve
2259 * or resolve error. Takes the same arguments as does
2260 * connection_ap_handshake_socks_resolved(). */
2262 tell_controller_about_resolved_result(edge_connection_t
*conn
,
2270 if (ttl
>= 0 && (answer_type
== RESOLVED_TYPE_IPV4
||
2271 answer_type
== RESOLVED_TYPE_HOSTNAME
)) {
2272 return; /* we already told the controller. */
2273 } else if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
>= 4) {
2275 char buf
[INET_NTOA_BUF_LEN
];
2276 in
.s_addr
= get_uint32(answer
);
2277 tor_inet_ntoa(&in
, buf
, sizeof(buf
));
2278 control_event_address_mapped(conn
->socks_request
->address
,
2279 buf
, expires
, NULL
);
2280 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
<256) {
2281 char *cp
= tor_strndup(answer
, answer_len
);
2282 control_event_address_mapped(conn
->socks_request
->address
,
2286 control_event_address_mapped(conn
->socks_request
->address
,
2293 /** Send an answer to an AP connection that has requested a DNS lookup via
2294 * SOCKS. The type should be one of RESOLVED_TYPE_(IPV4|IPV6|HOSTNAME) or -1
2295 * for unreachable; the answer should be in the format specified in the socks
2296 * extensions document. <b>ttl</b> is the ttl for the answer, or -1 on
2297 * certain errors or for values that didn't come via DNS. <b>expires</b> is
2298 * a time when the answer expires, or -1 or TIME_MAX if there's a good TTL.
2300 /* XXXX021 the use of the ttl and expires fields is nutty. Let's make this
2301 * interface and those that use it less ugly. */
2303 connection_ap_handshake_socks_resolved(edge_connection_t
*conn
,
2314 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2315 uint32_t a
= ntohl(get_uint32(answer
));
2317 client_dns_set_addressmap(conn
->socks_request
->address
, a
,
2318 conn
->chosen_exit_name
, ttl
);
2319 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
< 256) {
2320 char *cp
= tor_strndup(answer
, answer_len
);
2321 client_dns_set_reverse_addressmap(conn
->socks_request
->address
,
2323 conn
->chosen_exit_name
, ttl
);
2328 if (conn
->is_dns_request
) {
2329 if (conn
->dns_server_request
) {
2330 /* We had a request on our DNS port: answer it. */
2331 dnsserv_resolved(conn
, answer_type
, answer_len
, answer
, ttl
);
2332 conn
->socks_request
->has_finished
= 1;
2335 /* This must be a request from the controller. We already sent
2336 * a mapaddress if there's a ttl. */
2337 tell_controller_about_resolved_result(conn
, answer_type
, answer_len
,
2338 answer
, ttl
, expires
);
2339 conn
->socks_request
->has_finished
= 1;
2342 /* We shouldn't need to free conn here; it gets marked by the caller. */
2345 if (conn
->socks_request
->socks_version
== 4) {
2346 buf
[0] = 0x00; /* version */
2347 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2348 buf
[1] = SOCKS4_GRANTED
;
2349 set_uint16(buf
+2, 0);
2350 memcpy(buf
+4, answer
, 4); /* address */
2351 replylen
= SOCKS4_NETWORK_LEN
;
2352 } else { /* "error" */
2353 buf
[1] = SOCKS4_REJECT
;
2354 memset(buf
+2, 0, 6);
2355 replylen
= SOCKS4_NETWORK_LEN
;
2357 } else if (conn
->socks_request
->socks_version
== 5) {
2359 buf
[0] = 0x05; /* version */
2360 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2361 buf
[1] = SOCKS5_SUCCEEDED
;
2362 buf
[2] = 0; /* reserved */
2363 buf
[3] = 0x01; /* IPv4 address type */
2364 memcpy(buf
+4, answer
, 4); /* address */
2365 set_uint16(buf
+8, 0); /* port == 0. */
2367 } else if (answer_type
== RESOLVED_TYPE_IPV6
&& answer_len
== 16) {
2368 buf
[1] = SOCKS5_SUCCEEDED
;
2369 buf
[2] = 0; /* reserved */
2370 buf
[3] = 0x04; /* IPv6 address type */
2371 memcpy(buf
+4, answer
, 16); /* address */
2372 set_uint16(buf
+20, 0); /* port == 0. */
2374 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
< 256) {
2375 buf
[1] = SOCKS5_SUCCEEDED
;
2376 buf
[2] = 0; /* reserved */
2377 buf
[3] = 0x03; /* Domainname address type */
2378 buf
[4] = (char)answer_len
;
2379 memcpy(buf
+5, answer
, answer_len
); /* address */
2380 set_uint16(buf
+5+answer_len
, 0); /* port == 0. */
2381 replylen
= 5+answer_len
+2;
2383 buf
[1] = SOCKS5_HOST_UNREACHABLE
;
2384 memset(buf
+2, 0, 8);
2388 /* no socks version info; don't send anything back */
2391 connection_ap_handshake_socks_reply(conn
, buf
, replylen
,
2392 (answer_type
== RESOLVED_TYPE_IPV4
||
2393 answer_type
== RESOLVED_TYPE_IPV6
) ?
2394 0 : END_STREAM_REASON_RESOLVEFAILED
);
2397 /** Send a socks reply to stream <b>conn</b>, using the appropriate
2398 * socks version, etc, and mark <b>conn</b> as completed with SOCKS
2401 * If <b>reply</b> is defined, then write <b>replylen</b> bytes of it to conn
2402 * and return, else reply based on <b>endreason</b> (one of
2403 * END_STREAM_REASON_*). If <b>reply</b> is undefined, <b>endreason</b> can't
2404 * be 0 or REASON_DONE. Send endreason to the controller, if appropriate.
2407 connection_ap_handshake_socks_reply(edge_connection_t
*conn
, char *reply
,
2408 size_t replylen
, int endreason
)
2411 socks5_reply_status_t status
=
2412 stream_end_reason_to_socks5_response(endreason
);
2414 tor_assert(conn
->socks_request
); /* make sure it's an AP stream */
2416 control_event_stream_status(conn
,
2417 status
==SOCKS5_SUCCEEDED
? STREAM_EVENT_SUCCEEDED
: STREAM_EVENT_FAILED
,
2420 if (conn
->socks_request
->has_finished
) {
2421 log_warn(LD_BUG
, "(Harmless.) duplicate calls to "
2422 "connection_ap_handshake_socks_reply.");
2425 if (replylen
) { /* we already have a reply in mind */
2426 connection_write_to_buf(reply
, replylen
, TO_CONN(conn
));
2427 conn
->socks_request
->has_finished
= 1;
2430 if (conn
->socks_request
->socks_version
== 4) {
2431 memset(buf
,0,SOCKS4_NETWORK_LEN
);
2432 buf
[1] = (status
==SOCKS5_SUCCEEDED
? SOCKS4_GRANTED
: SOCKS4_REJECT
);
2433 /* leave version, destport, destip zero */
2434 connection_write_to_buf(buf
, SOCKS4_NETWORK_LEN
, TO_CONN(conn
));
2435 } else if (conn
->socks_request
->socks_version
== 5) {
2436 buf
[0] = 5; /* version 5 */
2437 buf
[1] = (char)status
;
2439 buf
[3] = 1; /* ipv4 addr */
2440 memset(buf
+4,0,6); /* Set external addr/port to 0.
2441 The spec doesn't seem to say what to do here. -RD */
2442 connection_write_to_buf(buf
,10,TO_CONN(conn
));
2444 /* If socks_version isn't 4 or 5, don't send anything.
2445 * This can happen in the case of AP bridges. */
2446 conn
->socks_request
->has_finished
= 1;
2450 /** A relay 'begin' or 'begin_dir' cell has arrived, and either we are
2451 * an exit hop for the circuit, or we are the origin and it is a
2454 * Launch a new exit connection and initialize things appropriately.
2456 * If it's a rendezvous stream, call connection_exit_connect() on
2459 * For general streams, call dns_resolve() on it first, and only call
2460 * connection_exit_connect() if the dns answer is already known.
2462 * Note that we don't call connection_add() on the new stream! We wait
2463 * for connection_exit_connect() to do that.
2465 * Return -(some circuit end reason) if we want to tear down <b>circ</b>.
2469 connection_exit_begin_conn(cell_t
*cell
, circuit_t
*circ
)
2471 edge_connection_t
*n_stream
;
2475 or_circuit_t
*or_circ
= NULL
;
2477 assert_circuit_ok(circ
);
2478 if (!CIRCUIT_IS_ORIGIN(circ
))
2479 or_circ
= TO_OR_CIRCUIT(circ
);
2481 relay_header_unpack(&rh
, cell
->payload
);
2483 /* Note: we have to use relay_send_command_from_edge here, not
2484 * connection_edge_end or connection_edge_send_command, since those require
2485 * that we have a stream connected to a circuit, and we don't connect to a
2486 * circuit until we have a pending/successful resolve. */
2488 if (!server_mode(get_options()) &&
2489 circ
->purpose
!= CIRCUIT_PURPOSE_S_REND_JOINED
) {
2490 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2491 "Relay begin cell at non-server. Closing.");
2492 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2493 END_STREAM_REASON_EXITPOLICY
, NULL
);
2497 if (rh
.command
== RELAY_COMMAND_BEGIN
) {
2498 if (!memchr(cell
->payload
+RELAY_HEADER_SIZE
, 0, rh
.length
)) {
2499 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2500 "Relay begin cell has no \\0. Closing.");
2501 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2502 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2505 if (parse_addr_port(LOG_PROTOCOL_WARN
, cell
->payload
+RELAY_HEADER_SIZE
,
2506 &address
,NULL
,&port
)<0) {
2507 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2508 "Unable to parse addr:port in relay begin cell. Closing.");
2509 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2510 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2514 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2515 "Missing port in relay begin cell. Closing.");
2516 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2517 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2521 if (or_circ
&& or_circ
->is_first_hop
&&
2522 !get_options()->AllowSingleHopExits
) {
2523 /* Don't let clients use us as a single-hop proxy, unless the user
2524 * has explicitly allowed that in the config. It attracts attackers
2525 * and users who'd be better off with, well, single-hop proxies.
2527 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2528 "Attempt to open a stream on first hop of circuit. Closing.");
2529 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2530 END_STREAM_REASON_TORPROTOCOL
, NULL
);
2534 } else if (rh
.command
== RELAY_COMMAND_BEGIN_DIR
) {
2535 if (!directory_permits_begindir_requests(get_options()) ||
2536 circ
->purpose
!= CIRCUIT_PURPOSE_OR
) {
2537 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2538 END_STREAM_REASON_NOTDIRECTORY
, NULL
);
2541 if (or_circ
&& or_circ
->p_conn
&& or_circ
->p_conn
->_base
.address
)
2542 address
= tor_strdup(or_circ
->p_conn
->_base
.address
);
2544 address
= tor_strdup("127.0.0.1");
2545 port
= 1; /* XXXX This value is never actually used anywhere, and there
2546 * isn't "really" a connection here. But we
2547 * need to set it to something nonzero. */
2549 log_warn(LD_BUG
, "Got an unexpected command %d", (int)rh
.command
);
2550 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2551 END_STREAM_REASON_INTERNAL
, NULL
);
2555 log_debug(LD_EXIT
,"Creating new exit connection.");
2556 n_stream
= edge_connection_new(CONN_TYPE_EXIT
, AF_INET
);
2557 n_stream
->_base
.purpose
= EXIT_PURPOSE_CONNECT
;
2559 n_stream
->stream_id
= rh
.stream_id
;
2560 n_stream
->_base
.port
= port
;
2561 /* leave n_stream->s at -1, because it's not yet valid */
2562 n_stream
->package_window
= STREAMWINDOW_START
;
2563 n_stream
->deliver_window
= STREAMWINDOW_START
;
2565 if (circ
->purpose
== CIRCUIT_PURPOSE_S_REND_JOINED
) {
2566 origin_circuit_t
*origin_circ
= TO_ORIGIN_CIRCUIT(circ
);
2567 log_info(LD_REND
,"begin is for rendezvous. configuring stream.");
2568 n_stream
->_base
.address
= tor_strdup("(rendezvous)");
2569 n_stream
->_base
.state
= EXIT_CONN_STATE_CONNECTING
;
2570 n_stream
->rend_data
= rend_data_dup(origin_circ
->rend_data
);
2571 tor_assert(connection_edge_is_rendezvous_stream(n_stream
));
2572 assert_circuit_ok(circ
);
2573 if (rend_service_set_connection_addr_port(n_stream
, origin_circ
) < 0) {
2574 log_info(LD_REND
,"Didn't find rendezvous service (port %d)",
2575 n_stream
->_base
.port
);
2576 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2577 END_STREAM_REASON_EXITPOLICY
,
2578 origin_circ
->cpath
->prev
);
2579 connection_free(TO_CONN(n_stream
));
2583 assert_circuit_ok(circ
);
2584 log_debug(LD_REND
,"Finished assigning addr/port");
2585 n_stream
->cpath_layer
= origin_circ
->cpath
->prev
; /* link it */
2587 /* add it into the linked list of n_streams on this circuit */
2588 n_stream
->next_stream
= origin_circ
->p_streams
;
2589 n_stream
->on_circuit
= circ
;
2590 origin_circ
->p_streams
= n_stream
;
2591 assert_circuit_ok(circ
);
2593 connection_exit_connect(n_stream
);
2597 tor_strlower(address
);
2598 n_stream
->_base
.address
= address
;
2599 n_stream
->_base
.state
= EXIT_CONN_STATE_RESOLVEFAILED
;
2600 /* default to failed, change in dns_resolve if it turns out not to fail */
2602 if (we_are_hibernating()) {
2603 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2604 END_STREAM_REASON_HIBERNATING
, NULL
);
2605 connection_free(TO_CONN(n_stream
));
2609 n_stream
->on_circuit
= circ
;
2611 if (rh
.command
== RELAY_COMMAND_BEGIN_DIR
) {
2612 tor_assert(or_circ
);
2613 if (or_circ
->p_conn
&& !tor_addr_is_null(&or_circ
->p_conn
->_base
.addr
))
2614 n_stream
->_base
.addr
= or_circ
->p_conn
->_base
.addr
;
2615 return connection_exit_connect_dir(n_stream
);
2618 log_debug(LD_EXIT
,"about to start the dns_resolve().");
2620 /* send it off to the gethostbyname farm */
2621 switch (dns_resolve(n_stream
)) {
2622 case 1: /* resolve worked; now n_stream is attached to circ. */
2623 assert_circuit_ok(circ
);
2624 log_debug(LD_EXIT
,"about to call connection_exit_connect().");
2625 connection_exit_connect(n_stream
);
2627 case -1: /* resolve failed */
2628 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2629 END_STREAM_REASON_RESOLVEFAILED
, NULL
);
2630 /* n_stream got freed. don't touch it. */
2632 case 0: /* resolve added to pending list */
2633 assert_circuit_ok(circ
);
2640 * Called when we receive a RELAY_COMMAND_RESOLVE cell 'cell' along the
2641 * circuit <b>circ</b>;
2642 * begin resolving the hostname, and (eventually) reply with a RESOLVED cell.
2645 connection_exit_begin_resolve(cell_t
*cell
, or_circuit_t
*circ
)
2647 edge_connection_t
*dummy_conn
;
2650 assert_circuit_ok(TO_CIRCUIT(circ
));
2651 relay_header_unpack(&rh
, cell
->payload
);
2653 /* This 'dummy_conn' only exists to remember the stream ID
2654 * associated with the resolve request; and to make the
2655 * implementation of dns.c more uniform. (We really only need to
2656 * remember the circuit, the stream ID, and the hostname to be
2657 * resolved; but if we didn't store them in a connection like this,
2658 * the housekeeping in dns.c would get way more complicated.)
2660 dummy_conn
= edge_connection_new(CONN_TYPE_EXIT
, AF_INET
);
2661 dummy_conn
->stream_id
= rh
.stream_id
;
2662 dummy_conn
->_base
.address
= tor_strndup(cell
->payload
+RELAY_HEADER_SIZE
,
2664 dummy_conn
->_base
.port
= 0;
2665 dummy_conn
->_base
.state
= EXIT_CONN_STATE_RESOLVEFAILED
;
2666 dummy_conn
->_base
.purpose
= EXIT_PURPOSE_RESOLVE
;
2668 dummy_conn
->on_circuit
= TO_CIRCUIT(circ
);
2670 /* send it off to the gethostbyname farm */
2671 switch (dns_resolve(dummy_conn
)) {
2672 case -1: /* Impossible to resolve; a resolved cell was sent. */
2673 /* Connection freed; don't touch it. */
2675 case 1: /* The result was cached; a resolved cell was sent. */
2676 if (!dummy_conn
->_base
.marked_for_close
)
2677 connection_free(TO_CONN(dummy_conn
));
2679 case 0: /* resolve added to pending list */
2680 assert_circuit_ok(TO_CIRCUIT(circ
));
2686 /** Connect to conn's specified addr and port. If it worked, conn
2687 * has now been added to the connection_array.
2689 * Send back a connected cell. Include the resolved IP of the destination
2690 * address, but <em>only</em> if it's a general exit stream. (Rendezvous
2691 * streams must not reveal what IP they connected to.)
2694 connection_exit_connect(edge_connection_t
*edge_conn
)
2696 const tor_addr_t
*addr
;
2698 connection_t
*conn
= TO_CONN(edge_conn
);
2699 int socket_error
= 0;
2701 if (!connection_edge_is_rendezvous_stream(edge_conn
) &&
2702 router_compare_to_my_exit_policy(edge_conn
)) {
2703 log_info(LD_EXIT
,"%s:%d failed exit policy. Closing.",
2704 escaped_safe_str(conn
->address
), conn
->port
);
2705 connection_edge_end(edge_conn
, END_STREAM_REASON_EXITPOLICY
);
2706 circuit_detach_stream(circuit_get_by_edge_conn(edge_conn
), edge_conn
);
2707 connection_free(conn
);
2714 log_debug(LD_EXIT
,"about to try connecting");
2715 switch (connection_connect(conn
, conn
->address
, addr
, port
, &socket_error
)) {
2717 /* XXX021 use socket_error below rather than trying to piece things
2718 * together from the current errno, which may have been clobbered. */
2719 connection_edge_end_errno(edge_conn
);
2720 circuit_detach_stream(circuit_get_by_edge_conn(edge_conn
), edge_conn
);
2721 connection_free(conn
);
2724 conn
->state
= EXIT_CONN_STATE_CONNECTING
;
2726 connection_watch_events(conn
, EV_WRITE
| EV_READ
);
2727 /* writable indicates finish;
2728 * readable/error indicates broken link in windowsland. */
2730 /* case 1: fall through */
2733 conn
->state
= EXIT_CONN_STATE_OPEN
;
2734 if (connection_wants_to_flush(conn
)) {
2735 /* in case there are any queued data cells */
2736 log_warn(LD_BUG
,"newly connected conn had data waiting!");
2737 // connection_start_writing(conn);
2739 connection_watch_events(conn
, EV_READ
);
2741 /* also, deliver a 'connected' cell back through the circuit. */
2742 if (connection_edge_is_rendezvous_stream(edge_conn
)) {
2743 /* rendezvous stream */
2744 /* don't send an address back! */
2745 connection_edge_send_command(edge_conn
,
2746 RELAY_COMMAND_CONNECTED
,
2748 } else { /* normal stream */
2749 char connected_payload
[20];
2750 int connected_payload_len
;
2751 if (tor_addr_family(&conn
->addr
) == AF_INET
) {
2752 set_uint32(connected_payload
, tor_addr_to_ipv4n(&conn
->addr
));
2753 connected_payload_len
= 4;
2755 memcpy(connected_payload
, tor_addr_to_in6_addr8(&conn
->addr
), 16);
2756 connected_payload_len
= 16;
2758 set_uint32(connected_payload
+connected_payload_len
,
2759 htonl(dns_clip_ttl(edge_conn
->address_ttl
)));
2760 connected_payload_len
+= 4;
2761 connection_edge_send_command(edge_conn
,
2762 RELAY_COMMAND_CONNECTED
,
2763 connected_payload
, connected_payload_len
);
2767 /** Given an exit conn that should attach to us as a directory server, open a
2768 * bridge connection with a linked connection pair, create a new directory
2769 * conn, and join them together. Return 0 on success (or if there was an
2770 * error we could send back an end cell for). Return -(some circuit end
2771 * reason) if the circuit needs to be torn down. Either connects
2772 * <b>exitconn</b>, frees it, or marks it, as appropriate.
2775 connection_exit_connect_dir(edge_connection_t
*exitconn
)
2777 dir_connection_t
*dirconn
= NULL
;
2778 or_circuit_t
*circ
= TO_OR_CIRCUIT(exitconn
->on_circuit
);
2780 log_info(LD_EXIT
, "Opening local connection for anonymized directory exit");
2782 exitconn
->_base
.state
= EXIT_CONN_STATE_OPEN
;
2784 dirconn
= dir_connection_new(AF_INET
);
2786 dirconn
->_base
.addr
= exitconn
->_base
.addr
;
2787 dirconn
->_base
.port
= 0;
2788 dirconn
->_base
.address
= tor_strdup(circ
->p_conn
->_base
.address
);
2789 dirconn
->_base
.type
= CONN_TYPE_DIR
;
2790 dirconn
->_base
.purpose
= DIR_PURPOSE_SERVER
;
2791 dirconn
->_base
.state
= DIR_CONN_STATE_SERVER_COMMAND_WAIT
;
2793 connection_link_connections(TO_CONN(dirconn
), TO_CONN(exitconn
));
2795 if (connection_add(TO_CONN(exitconn
))<0) {
2796 connection_edge_end(exitconn
, END_STREAM_REASON_RESOURCELIMIT
);
2797 connection_free(TO_CONN(exitconn
));
2798 connection_free(TO_CONN(dirconn
));
2802 /* link exitconn to circ, now that we know we can use it. */
2803 exitconn
->next_stream
= circ
->n_streams
;
2804 circ
->n_streams
= exitconn
;
2806 if (connection_add(TO_CONN(dirconn
))<0) {
2807 connection_edge_end(exitconn
, END_STREAM_REASON_RESOURCELIMIT
);
2808 connection_close_immediate(TO_CONN(exitconn
));
2809 connection_mark_for_close(TO_CONN(exitconn
));
2810 connection_free(TO_CONN(dirconn
));
2814 connection_start_reading(TO_CONN(dirconn
));
2815 connection_start_reading(TO_CONN(exitconn
));
2817 if (connection_edge_send_command(exitconn
,
2818 RELAY_COMMAND_CONNECTED
, NULL
, 0) < 0) {
2819 connection_mark_for_close(TO_CONN(exitconn
));
2820 connection_mark_for_close(TO_CONN(dirconn
));
2827 /** Return 1 if <b>conn</b> is a rendezvous stream, or 0 if
2828 * it is a general stream.
2831 connection_edge_is_rendezvous_stream(edge_connection_t
*conn
)
2834 if (conn
->rend_data
) /* XXX */ /* XXXX Why is this XXX? -NM */
2839 /** Return 1 if router <b>exit</b> is likely to allow stream <b>conn</b>
2840 * to exit from it, or 0 if it probably will not allow it.
2841 * (We might be uncertain if conn's destination address has not yet been
2845 connection_ap_can_use_exit(edge_connection_t
*conn
, routerinfo_t
*exit
)
2848 tor_assert(conn
->_base
.type
== CONN_TYPE_AP
);
2849 tor_assert(conn
->socks_request
);
2852 /* If a particular exit node has been requested for the new connection,
2853 * make sure the exit node of the existing circuit matches exactly.
2855 if (conn
->chosen_exit_name
) {
2856 routerinfo_t
*chosen_exit
=
2857 router_get_by_nickname(conn
->chosen_exit_name
, 1);
2858 if (!chosen_exit
|| memcmp(chosen_exit
->cache_info
.identity_digest
,
2859 exit
->cache_info
.identity_digest
, DIGEST_LEN
)) {
2861 // log_debug(LD_APP,"Requested node '%s', considering node '%s'. No.",
2862 // conn->chosen_exit_name, exit->nickname);
2867 if (conn
->socks_request
->command
== SOCKS_COMMAND_CONNECT
&&
2868 !conn
->use_begindir
) {
2871 addr_policy_result_t r
;
2872 if (tor_inet_aton(conn
->socks_request
->address
, &in
))
2873 addr
= ntohl(in
.s_addr
);
2874 r
= compare_addr_to_addr_policy(addr
, conn
->socks_request
->port
,
2876 if (r
== ADDR_POLICY_REJECTED
)
2877 return 0; /* We know the address, and the exit policy rejects it. */
2878 if (r
== ADDR_POLICY_PROBABLY_REJECTED
&& !conn
->chosen_exit_name
)
2879 return 0; /* We don't know the addr, but the exit policy rejects most
2880 * addresses with this port. Since the user didn't ask for
2881 * this node, err on the side of caution. */
2882 } else if (SOCKS_COMMAND_IS_RESOLVE(conn
->socks_request
->command
)) {
2883 /* Can't support reverse lookups without eventdns. */
2884 if (conn
->socks_request
->command
== SOCKS_COMMAND_RESOLVE_PTR
&&
2885 exit
->has_old_dnsworkers
)
2888 /* Don't send DNS requests to non-exit servers by default. */
2889 if (!conn
->chosen_exit_name
&& policy_is_reject_star(exit
->exit_policy
))
2895 /** If address is of the form "y.onion" with a well-formed handle y:
2896 * Put a NUL after y, lower-case it, and return ONION_HOSTNAME.
2898 * If address is of the form "y.exit":
2899 * Put a NUL after y and return EXIT_HOSTNAME.
2902 * Return NORMAL_HOSTNAME and change nothing.
2905 parse_extended_hostname(char *address
)
2908 char query
[REND_SERVICE_ID_LEN_BASE32
+1];
2910 s
= strrchr(address
,'.');
2912 return NORMAL_HOSTNAME
; /* no dot, thus normal */
2913 if (!strcmp(s
+1,"exit")) {
2914 *s
= 0; /* nul-terminate it */
2915 return EXIT_HOSTNAME
; /* .exit */
2917 if (strcmp(s
+1,"onion"))
2918 return NORMAL_HOSTNAME
; /* neither .exit nor .onion, thus normal */
2920 /* so it is .onion */
2921 *s
= 0; /* nul-terminate it */
2922 if (strlcpy(query
, address
, REND_SERVICE_ID_LEN_BASE32
+1) >=
2923 REND_SERVICE_ID_LEN_BASE32
+1)
2925 if (rend_valid_service_id(query
)) {
2926 return ONION_HOSTNAME
; /* success */
2929 /* otherwise, return to previous state and return 0 */
2931 return BAD_HOSTNAME
;
2934 /** Check if the address is of the form "y.noconnect"
2937 hostname_is_noconnect_address(const char *address
)
2939 return ! strcasecmpend(address
, ".noconnect");