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) 2007-2016, The Tor Project, Inc. */
5 /* See LICENSE for licensing information */
8 * \file connection_edge.c
9 * \brief Handle edge streams.
11 #define CONNECTION_EDGE_PRIVATE
15 #include "backtrace.h"
17 #include "addressmap.h"
20 #include "circpathbias.h"
21 #include "circuitlist.h"
22 #include "circuituse.h"
24 #include "connection.h"
25 #include "connection_edge.h"
26 #include "connection_or.h"
31 #include "hibernate.h"
37 #include "rendclient.h"
38 #include "rendcommon.h"
39 #include "rendservice.h"
42 #include "routerlist.h"
43 #include "routerset.h"
44 #include "circuitbuild.h"
46 #ifdef HAVE_LINUX_TYPES_H
47 #include <linux/types.h>
49 #ifdef HAVE_LINUX_NETFILTER_IPV4_H
50 #include <linux/netfilter_ipv4.h>
51 #define TRANS_NETFILTER
52 #define TRANS_NETFILTER_IPV4
55 #ifdef HAVE_LINUX_IF_H
59 #ifdef HAVE_LINUX_NETFILTER_IPV6_IP6_TABLES_H
60 #include <linux/netfilter_ipv6/ip6_tables.h>
61 #if defined(IP6T_SO_ORIGINAL_DST)
62 #define TRANS_NETFILTER
63 #define TRANS_NETFILTER_IPV6
67 #if defined(HAVE_NET_IF_H) && defined(HAVE_NET_PFVAR_H)
69 #include <net/pfvar.h>
77 #define SOCKS4_GRANTED 90
78 #define SOCKS4_REJECT 91
80 static int connection_ap_handshake_process_socks(entry_connection_t
*conn
);
81 static int connection_ap_process_natd(entry_connection_t
*conn
);
82 static int connection_exit_connect_dir(edge_connection_t
*exitconn
);
83 static int consider_plaintext_ports(entry_connection_t
*conn
, uint16_t port
);
84 static int connection_ap_supports_optimistic_data(const entry_connection_t
*);
86 /** An AP stream has failed/finished. If it hasn't already sent back
87 * a socks reply, send one now (based on endreason). Also set
88 * has_sent_end to 1, and mark the conn.
91 connection_mark_unattached_ap_
,(entry_connection_t
*conn
, int endreason
,
92 int line
, const char *file
))
94 connection_t
*base_conn
= ENTRY_TO_CONN(conn
);
95 edge_connection_t
*edge_conn
= ENTRY_TO_EDGE_CONN(conn
);
96 tor_assert(base_conn
->type
== CONN_TYPE_AP
);
97 ENTRY_TO_EDGE_CONN(conn
)->edge_has_sent_end
= 1; /* no circ yet */
99 /* If this is a rendezvous stream and it is failing without ever
100 * being attached to a circuit, assume that an attempt to connect to
101 * the destination hidden service has just ended.
103 * XXXX This condition doesn't limit to only streams failing
104 * without ever being attached. That sloppiness should be harmless,
105 * but we should fix it someday anyway. */
106 if ((edge_conn
->on_circuit
!= NULL
|| edge_conn
->edge_has_sent_end
) &&
107 connection_edge_is_rendezvous_stream(edge_conn
)) {
108 rend_client_note_connection_attempt_ended(edge_conn
->rend_data
);
111 if (base_conn
->marked_for_close
) {
112 /* This call will warn as appropriate. */
113 connection_mark_for_close_(base_conn
, line
, file
);
117 if (!conn
->socks_request
->has_finished
) {
118 if (endreason
& END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
)
120 "stream (marked at %s:%d) sending two socks replies?",
123 if (SOCKS_COMMAND_IS_CONNECT(conn
->socks_request
->command
))
124 connection_ap_handshake_socks_reply(conn
, NULL
, 0, endreason
);
125 else if (SOCKS_COMMAND_IS_RESOLVE(conn
->socks_request
->command
))
126 connection_ap_handshake_socks_resolved(conn
,
127 RESOLVED_TYPE_ERROR_TRANSIENT
,
129 else /* unknown or no handshake at all. send no response. */
130 conn
->socks_request
->has_finished
= 1;
133 connection_mark_and_flush_(base_conn
, line
, file
);
135 ENTRY_TO_EDGE_CONN(conn
)->end_reason
= endreason
;
138 /** There was an EOF. Send an end and mark the connection for close.
141 connection_edge_reached_eof(edge_connection_t
*conn
)
143 if (connection_get_inbuf_len(TO_CONN(conn
)) &&
144 connection_state_is_open(TO_CONN(conn
))) {
145 /* it still has stuff to process. don't let it die yet. */
148 log_info(LD_EDGE
,"conn (fd "TOR_SOCKET_T_FORMAT
") reached eof. Closing.",
150 if (!conn
->base_
.marked_for_close
) {
151 /* only mark it if not already marked. it's possible to
152 * get the 'end' right around when the client hangs up on us. */
153 connection_edge_end(conn
, END_STREAM_REASON_DONE
);
154 if (conn
->base_
.type
== CONN_TYPE_AP
) {
155 /* eof, so don't send a socks reply back */
156 if (EDGE_TO_ENTRY_CONN(conn
)->socks_request
)
157 EDGE_TO_ENTRY_CONN(conn
)->socks_request
->has_finished
= 1;
159 connection_mark_for_close(TO_CONN(conn
));
164 /** Handle new bytes on conn->inbuf based on state:
165 * - If it's waiting for socks info, try to read another step of the
166 * socks handshake out of conn->inbuf.
167 * - If it's waiting for the original destination, fetch it.
168 * - If it's open, then package more relay cells from the stream.
169 * - Else, leave the bytes on inbuf alone for now.
171 * Mark and return -1 if there was an unexpected error with the conn,
175 connection_edge_process_inbuf(edge_connection_t
*conn
, int package_partial
)
179 switch (conn
->base_
.state
) {
180 case AP_CONN_STATE_SOCKS_WAIT
:
181 if (connection_ap_handshake_process_socks(EDGE_TO_ENTRY_CONN(conn
)) <0) {
186 case AP_CONN_STATE_NATD_WAIT
:
187 if (connection_ap_process_natd(EDGE_TO_ENTRY_CONN(conn
)) < 0) {
192 case AP_CONN_STATE_OPEN
:
193 case EXIT_CONN_STATE_OPEN
:
194 if (connection_edge_package_raw_inbuf(conn
, package_partial
, NULL
) < 0) {
195 /* (We already sent an end cell if possible) */
196 connection_mark_for_close(TO_CONN(conn
));
200 case AP_CONN_STATE_CONNECT_WAIT
:
201 if (connection_ap_supports_optimistic_data(EDGE_TO_ENTRY_CONN(conn
))) {
203 "data from edge while in '%s' state. Sending it anyway. "
204 "package_partial=%d, buflen=%ld",
205 conn_state_to_string(conn
->base_
.type
, conn
->base_
.state
),
207 (long)connection_get_inbuf_len(TO_CONN(conn
)));
208 if (connection_edge_package_raw_inbuf(conn
, package_partial
, NULL
)<0) {
209 /* (We already sent an end cell if possible) */
210 connection_mark_for_close(TO_CONN(conn
));
215 /* Fall through if the connection is on a circuit without optimistic
217 case EXIT_CONN_STATE_CONNECTING
:
218 case AP_CONN_STATE_RENDDESC_WAIT
:
219 case AP_CONN_STATE_CIRCUIT_WAIT
:
220 case AP_CONN_STATE_RESOLVE_WAIT
:
221 case AP_CONN_STATE_CONTROLLER_WAIT
:
223 "data from edge while in '%s' state. Leaving it on buffer.",
224 conn_state_to_string(conn
->base_
.type
, conn
->base_
.state
));
227 log_warn(LD_BUG
,"Got unexpected state %d. Closing.",conn
->base_
.state
);
228 tor_fragile_assert();
229 connection_edge_end(conn
, END_STREAM_REASON_INTERNAL
);
230 connection_mark_for_close(TO_CONN(conn
));
234 /** This edge needs to be closed, because its circuit has closed.
235 * Mark it for close and return 0.
238 connection_edge_destroy(circid_t circ_id
, edge_connection_t
*conn
)
240 if (!conn
->base_
.marked_for_close
) {
241 log_info(LD_EDGE
, "CircID %u: At an edge. Marking connection for close.",
243 if (conn
->base_
.type
== CONN_TYPE_AP
) {
244 entry_connection_t
*entry_conn
= EDGE_TO_ENTRY_CONN(conn
);
245 connection_mark_unattached_ap(entry_conn
, END_STREAM_REASON_DESTROY
);
246 control_event_stream_bandwidth(conn
);
247 control_event_stream_status(entry_conn
, STREAM_EVENT_CLOSED
,
248 END_STREAM_REASON_DESTROY
);
249 conn
->end_reason
|= END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED
;
251 /* closing the circuit, nothing to send an END to */
252 conn
->edge_has_sent_end
= 1;
253 conn
->end_reason
= END_STREAM_REASON_DESTROY
;
254 conn
->end_reason
|= END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED
;
255 connection_mark_and_flush(TO_CONN(conn
));
258 conn
->cpath_layer
= NULL
;
259 conn
->on_circuit
= NULL
;
263 /** Send a raw end cell to the stream with ID <b>stream_id</b> out over the
264 * <b>circ</b> towards the hop identified with <b>cpath_layer</b>. If this
265 * is not a client connection, set the relay end cell's reason for closing
266 * as <b>reason</b> */
268 relay_send_end_cell_from_edge(streamid_t stream_id
, circuit_t
*circ
,
269 uint8_t reason
, crypt_path_t
*cpath_layer
)
273 if (CIRCUIT_PURPOSE_IS_CLIENT(circ
->purpose
)) {
274 /* Never send the server an informative reason code; it doesn't need to
275 * know why the client stream is failing. */
276 reason
= END_STREAM_REASON_MISC
;
279 payload
[0] = (char) reason
;
281 return relay_send_command_from_edge(stream_id
, circ
, RELAY_COMMAND_END
,
282 payload
, 1, cpath_layer
);
285 /** Send a relay end cell from stream <b>conn</b> down conn's circuit, and
286 * remember that we've done so. If this is not a client connection, set the
287 * relay end cell's reason for closing as <b>reason</b>.
289 * Return -1 if this function has already been called on this conn,
293 connection_edge_end(edge_connection_t
*conn
, uint8_t reason
)
295 char payload
[RELAY_PAYLOAD_SIZE
];
296 size_t payload_len
=1;
298 uint8_t control_reason
= reason
;
300 if (conn
->edge_has_sent_end
) {
301 log_warn(LD_BUG
,"(Harmless.) Calling connection_edge_end (reason %d) "
302 "on an already ended stream?", reason
);
303 tor_fragile_assert();
307 if (conn
->base_
.marked_for_close
) {
309 "called on conn that's already marked for close at %s:%d.",
310 conn
->base_
.marked_for_close_file
, conn
->base_
.marked_for_close
);
314 circ
= circuit_get_by_edge_conn(conn
);
315 if (circ
&& CIRCUIT_PURPOSE_IS_CLIENT(circ
->purpose
)) {
316 /* If this is a client circuit, don't send the server an informative
317 * reason code; it doesn't need to know why the client stream is
319 reason
= END_STREAM_REASON_MISC
;
322 payload
[0] = (char)reason
;
323 if (reason
== END_STREAM_REASON_EXITPOLICY
&&
324 !connection_edge_is_rendezvous_stream(conn
)) {
326 if (tor_addr_family(&conn
->base_
.addr
) == AF_INET
) {
327 set_uint32(payload
+1, tor_addr_to_ipv4n(&conn
->base_
.addr
));
330 memcpy(payload
+1, tor_addr_to_in6_addr8(&conn
->base_
.addr
), 16);
333 set_uint32(payload
+1+addrlen
, htonl(dns_clip_ttl(conn
->address_ttl
)));
334 payload_len
+= 4+addrlen
;
337 if (circ
&& !circ
->marked_for_close
) {
338 log_debug(LD_EDGE
,"Sending end on conn (fd "TOR_SOCKET_T_FORMAT
").",
340 connection_edge_send_command(conn
, RELAY_COMMAND_END
,
341 payload
, payload_len
);
343 log_debug(LD_EDGE
,"No circ to send end on conn "
344 "(fd "TOR_SOCKET_T_FORMAT
").",
348 conn
->edge_has_sent_end
= 1;
349 conn
->end_reason
= control_reason
;
353 /** An error has just occurred on an operation on an edge connection
354 * <b>conn</b>. Extract the errno; convert it to an end reason, and send an
355 * appropriate relay end cell to the other end of the connection's circuit.
358 connection_edge_end_errno(edge_connection_t
*conn
)
362 reason
= errno_to_stream_end_reason(tor_socket_errno(conn
->base_
.s
));
363 return connection_edge_end(conn
, reason
);
366 /** We just wrote some data to <b>conn</b>; act appropriately.
368 * (That is, if it's open, consider sending a stream-level sendme cell if we
369 * have just flushed enough.)
372 connection_edge_flushed_some(edge_connection_t
*conn
)
374 switch (conn
->base_
.state
) {
375 case AP_CONN_STATE_OPEN
:
376 case EXIT_CONN_STATE_OPEN
:
377 connection_edge_consider_sending_sendme(conn
);
383 /** Connection <b>conn</b> has finished writing and has no bytes left on
386 * If it's in state 'open', stop writing, consider responding with a
387 * sendme, and return.
388 * Otherwise, stop writing and return.
390 * If <b>conn</b> is broken, mark it for close and return -1, else
394 connection_edge_finished_flushing(edge_connection_t
*conn
)
398 switch (conn
->base_
.state
) {
399 case AP_CONN_STATE_OPEN
:
400 case EXIT_CONN_STATE_OPEN
:
401 connection_edge_consider_sending_sendme(conn
);
403 case AP_CONN_STATE_SOCKS_WAIT
:
404 case AP_CONN_STATE_NATD_WAIT
:
405 case AP_CONN_STATE_RENDDESC_WAIT
:
406 case AP_CONN_STATE_CIRCUIT_WAIT
:
407 case AP_CONN_STATE_CONNECT_WAIT
:
408 case AP_CONN_STATE_CONTROLLER_WAIT
:
409 case AP_CONN_STATE_RESOLVE_WAIT
:
412 log_warn(LD_BUG
, "Called in unexpected state %d.",conn
->base_
.state
);
413 tor_fragile_assert();
419 /** Longest size for the relay payload of a RELAY_CONNECTED cell that we're
420 * able to generate. */
421 /* 4 zero bytes; 1 type byte; 16 byte IPv6 address; 4 byte TTL. */
422 #define MAX_CONNECTED_CELL_PAYLOAD_LEN 25
424 /** Set the buffer at <b>payload_out</b> -- which must have at least
425 * MAX_CONNECTED_CELL_PAYLOAD_LEN bytes available -- to the body of a
426 * RELAY_CONNECTED cell indicating that we have connected to <b>addr</b>, and
427 * that the name resolution that led us to <b>addr</b> will be valid for
428 * <b>ttl</b> seconds. Return -1 on error, or the number of bytes used on
431 connected_cell_format_payload(uint8_t *payload_out
,
432 const tor_addr_t
*addr
,
435 const sa_family_t family
= tor_addr_family(addr
);
436 int connected_payload_len
;
438 /* should be needless */
439 memset(payload_out
, 0, MAX_CONNECTED_CELL_PAYLOAD_LEN
);
441 if (family
== AF_INET
) {
442 set_uint32(payload_out
, tor_addr_to_ipv4n(addr
));
443 connected_payload_len
= 4;
444 } else if (family
== AF_INET6
) {
445 set_uint32(payload_out
, 0);
446 set_uint8(payload_out
+ 4, 6);
447 memcpy(payload_out
+ 5, tor_addr_to_in6_addr8(addr
), 16);
448 connected_payload_len
= 21;
453 set_uint32(payload_out
+ connected_payload_len
, htonl(dns_clip_ttl(ttl
)));
454 connected_payload_len
+= 4;
456 tor_assert(connected_payload_len
<= MAX_CONNECTED_CELL_PAYLOAD_LEN
);
458 return connected_payload_len
;
461 /** Connected handler for exit connections: start writing pending
462 * data, deliver 'CONNECTED' relay cells as appropriate, and check
463 * any pending data that may have been received. */
465 connection_edge_finished_connecting(edge_connection_t
*edge_conn
)
469 tor_assert(edge_conn
);
470 tor_assert(edge_conn
->base_
.type
== CONN_TYPE_EXIT
);
471 conn
= TO_CONN(edge_conn
);
472 tor_assert(conn
->state
== EXIT_CONN_STATE_CONNECTING
);
474 log_info(LD_EXIT
,"Exit connection to %s:%u (%s) established.",
475 escaped_safe_str(conn
->address
), conn
->port
,
476 safe_str(fmt_and_decorate_addr(&conn
->addr
)));
478 rep_hist_note_exit_stream_opened(conn
->port
);
480 conn
->state
= EXIT_CONN_STATE_OPEN
;
481 IF_HAS_NO_BUFFEREVENT(conn
)
482 connection_watch_events(conn
, READ_EVENT
); /* stop writing, keep reading */
483 if (connection_get_outbuf_len(conn
)) /* in case there are any queued relay
485 connection_start_writing(conn
);
486 /* deliver a 'connected' relay cell back through the circuit. */
487 if (connection_edge_is_rendezvous_stream(edge_conn
)) {
488 if (connection_edge_send_command(edge_conn
,
489 RELAY_COMMAND_CONNECTED
, NULL
, 0) < 0)
490 return 0; /* circuit is closed, don't continue */
492 uint8_t connected_payload
[MAX_CONNECTED_CELL_PAYLOAD_LEN
];
493 int connected_payload_len
=
494 connected_cell_format_payload(connected_payload
, &conn
->addr
,
495 edge_conn
->address_ttl
);
496 if (connected_payload_len
< 0)
499 if (connection_edge_send_command(edge_conn
,
500 RELAY_COMMAND_CONNECTED
,
501 (char*)connected_payload
, connected_payload_len
) < 0)
502 return 0; /* circuit is closed, don't continue */
504 tor_assert(edge_conn
->package_window
> 0);
505 /* in case the server has written anything */
506 return connection_edge_process_inbuf(edge_conn
, 1);
509 /** A list of all the entry_connection_t * objects that are not marked
510 * for close, and are in AP_CONN_STATE_CIRCUIT_WAIT.
512 * (Right now, we check in several places to make sure that this list is
513 * correct. When it's incorrect, we'll fix it, and log a BUG message.)
515 static smartlist_t
*pending_entry_connections
= NULL
;
517 static int untried_pending_connections
= 0;
519 /** Common code to connection_(ap|exit)_about_to_close. */
521 connection_edge_about_to_close(edge_connection_t
*edge_conn
)
523 if (!edge_conn
->edge_has_sent_end
) {
524 connection_t
*conn
= TO_CONN(edge_conn
);
525 log_warn(LD_BUG
, "(Harmless.) Edge connection (marked at %s:%d) "
526 "hasn't sent end yet?",
527 conn
->marked_for_close_file
, conn
->marked_for_close
);
528 tor_fragile_assert();
532 /** Called when we're about to finally unlink and free an AP (client)
533 * connection: perform necessary accounting and cleanup */
535 connection_ap_about_to_close(entry_connection_t
*entry_conn
)
538 edge_connection_t
*edge_conn
= ENTRY_TO_EDGE_CONN(entry_conn
);
539 connection_t
*conn
= ENTRY_TO_CONN(entry_conn
);
541 connection_edge_about_to_close(edge_conn
);
543 if (entry_conn
->socks_request
->has_finished
== 0) {
544 /* since conn gets removed right after this function finishes,
545 * there's no point trying to send back a reply at this point. */
546 log_warn(LD_BUG
,"Closing stream (marked at %s:%d) without sending"
547 " back a socks reply.",
548 conn
->marked_for_close_file
, conn
->marked_for_close
);
550 if (!edge_conn
->end_reason
) {
551 log_warn(LD_BUG
,"Closing stream (marked at %s:%d) without having"
553 conn
->marked_for_close_file
, conn
->marked_for_close
);
555 if (entry_conn
->dns_server_request
) {
556 log_warn(LD_BUG
,"Closing stream (marked at %s:%d) without having"
557 " replied to DNS request.",
558 conn
->marked_for_close_file
, conn
->marked_for_close
);
559 dnsserv_reject_request(entry_conn
);
562 if (TO_CONN(edge_conn
)->state
== AP_CONN_STATE_CIRCUIT_WAIT
) {
563 smartlist_remove(pending_entry_connections
, entry_conn
);
567 /* Check to make sure that this isn't in pending_entry_connections if it
568 * didn't actually belong there. */
569 if (TO_CONN(edge_conn
)->type
== CONN_TYPE_AP
) {
570 connection_ap_warn_and_unmark_if_pending_circ(entry_conn
,
575 control_event_stream_bandwidth(edge_conn
);
576 control_event_stream_status(entry_conn
, STREAM_EVENT_CLOSED
,
577 edge_conn
->end_reason
);
578 circ
= circuit_get_by_edge_conn(edge_conn
);
580 circuit_detach_stream(circ
, edge_conn
);
583 /** Called when we're about to finally unlink and free an exit
584 * connection: perform necessary accounting and cleanup */
586 connection_exit_about_to_close(edge_connection_t
*edge_conn
)
589 connection_t
*conn
= TO_CONN(edge_conn
);
591 connection_edge_about_to_close(edge_conn
);
593 circ
= circuit_get_by_edge_conn(edge_conn
);
595 circuit_detach_stream(circ
, edge_conn
);
596 if (conn
->state
== EXIT_CONN_STATE_RESOLVING
) {
597 connection_dns_remove(edge_conn
);
601 /** Define a schedule for how long to wait between retrying
602 * application connections. Rather than waiting a fixed amount of
603 * time between each retry, we wait 10 seconds each for the first
604 * two tries, and 15 seconds for each retry after
605 * that. Hopefully this will improve the expected user experience. */
607 compute_retry_timeout(entry_connection_t
*conn
)
609 int timeout
= get_options()->CircuitStreamTimeout
;
610 if (timeout
) /* if our config options override the default, use them */
612 if (conn
->num_socks_retries
< 2) /* try 0 and try 1 */
617 /** Find all general-purpose AP streams waiting for a response that sent their
618 * begin/resolve cell too long ago. Detach from their current circuit, and
619 * mark their current circuit as unsuitable for new streams. Then call
620 * connection_ap_handshake_attach_circuit() to attach to a new circuit (if
621 * available) or launch a new one.
623 * For rendezvous streams, simply give up after SocksTimeout seconds (with no
627 connection_ap_expire_beginning(void)
629 edge_connection_t
*conn
;
630 entry_connection_t
*entry_conn
;
632 time_t now
= time(NULL
);
633 const or_options_t
*options
= get_options();
636 int seconds_idle
, seconds_since_born
;
637 smartlist_t
*conns
= get_connection_array();
639 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, base_conn
) {
640 if (base_conn
->type
!= CONN_TYPE_AP
|| base_conn
->marked_for_close
)
642 entry_conn
= TO_ENTRY_CONN(base_conn
);
643 conn
= ENTRY_TO_EDGE_CONN(entry_conn
);
644 /* if it's an internal linked connection, don't yell its status. */
645 severity
= (tor_addr_is_null(&base_conn
->addr
) && !base_conn
->port
)
646 ? LOG_INFO
: LOG_NOTICE
;
647 seconds_idle
= (int)( now
- base_conn
->timestamp_lastread
);
648 seconds_since_born
= (int)( now
- base_conn
->timestamp_created
);
650 if (base_conn
->state
== AP_CONN_STATE_OPEN
)
653 /* We already consider SocksTimeout in
654 * connection_ap_handshake_attach_circuit(), but we need to consider
655 * it here too because controllers that put streams in controller_wait
656 * state never ask Tor to attach the circuit. */
657 if (AP_CONN_STATE_IS_UNATTACHED(base_conn
->state
)) {
658 if (seconds_since_born
>= options
->SocksTimeout
) {
659 log_fn(severity
, LD_APP
,
660 "Tried for %d seconds to get a connection to %s:%d. "
663 safe_str_client(entry_conn
->socks_request
->address
),
664 entry_conn
->socks_request
->port
,
665 conn_state_to_string(CONN_TYPE_AP
, base_conn
->state
));
666 connection_mark_unattached_ap(entry_conn
, END_STREAM_REASON_TIMEOUT
);
671 /* We're in state connect_wait or resolve_wait now -- waiting for a
672 * reply to our relay cell. See if we want to retry/give up. */
674 cutoff
= compute_retry_timeout(entry_conn
);
675 if (seconds_idle
< cutoff
)
677 circ
= circuit_get_by_edge_conn(conn
);
678 if (!circ
) { /* it's vanished? */
679 log_info(LD_APP
,"Conn is waiting (address %s), but lost its circ.",
680 safe_str_client(entry_conn
->socks_request
->address
));
681 connection_mark_unattached_ap(entry_conn
, END_STREAM_REASON_TIMEOUT
);
684 if (circ
->purpose
== CIRCUIT_PURPOSE_C_REND_JOINED
) {
685 if (seconds_idle
>= options
->SocksTimeout
) {
686 log_fn(severity
, LD_REND
,
687 "Rend stream is %d seconds late. Giving up on address"
690 safe_str_client(entry_conn
->socks_request
->address
));
691 /* Roll back path bias use state so that we probe the circuit
692 * if nothing else succeeds on it */
693 pathbias_mark_use_rollback(TO_ORIGIN_CIRCUIT(circ
));
695 connection_edge_end(conn
, END_STREAM_REASON_TIMEOUT
);
696 connection_mark_unattached_ap(entry_conn
, END_STREAM_REASON_TIMEOUT
);
700 if (circ
->purpose
!= CIRCUIT_PURPOSE_C_GENERAL
&&
701 circ
->purpose
!= CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT
&&
702 circ
->purpose
!= CIRCUIT_PURPOSE_PATH_BIAS_TESTING
) {
703 log_warn(LD_BUG
, "circuit->purpose == CIRCUIT_PURPOSE_C_GENERAL failed. "
704 "The purpose on the circuit was %s; it was in state %s, "
706 circuit_purpose_to_string(circ
->purpose
),
707 circuit_state_to_string(circ
->state
),
708 CIRCUIT_IS_ORIGIN(circ
) ?
709 pathbias_state_to_string(TO_ORIGIN_CIRCUIT(circ
)->path_state
) :
712 log_fn(cutoff
< 15 ? LOG_INFO
: severity
, LD_APP
,
713 "We tried for %d seconds to connect to '%s' using exit %s."
714 " Retrying on a new circuit.",
716 safe_str_client(entry_conn
->socks_request
->address
),
718 extend_info_describe(conn
->cpath_layer
->extend_info
):
720 /* send an end down the circuit */
721 connection_edge_end(conn
, END_STREAM_REASON_TIMEOUT
);
722 /* un-mark it as ending, since we're going to reuse it */
723 conn
->edge_has_sent_end
= 0;
724 conn
->end_reason
= 0;
725 /* make us not try this circuit again, but allow
726 * current streams on it to survive if they can */
727 mark_circuit_unusable_for_new_conns(TO_ORIGIN_CIRCUIT(circ
));
729 /* give our stream another 'cutoff' seconds to try */
730 conn
->base_
.timestamp_lastread
+= cutoff
;
731 if (entry_conn
->num_socks_retries
< 250) /* avoid overflow */
732 entry_conn
->num_socks_retries
++;
733 /* move it back into 'pending' state, and try to attach. */
734 if (connection_ap_detach_retriable(entry_conn
, TO_ORIGIN_CIRCUIT(circ
),
735 END_STREAM_REASON_TIMEOUT
)<0) {
736 if (!base_conn
->marked_for_close
)
737 connection_mark_unattached_ap(entry_conn
,
738 END_STREAM_REASON_CANT_ATTACH
);
740 } SMARTLIST_FOREACH_END(base_conn
);
744 * As connection_ap_attach_pending, but first scans the entire connection
745 * array to see if any elements are missing.
748 connection_ap_rescan_and_attach_pending(void)
750 entry_connection_t
*entry_conn
;
751 smartlist_t
*conns
= get_connection_array();
753 if (PREDICT_UNLIKELY(NULL
== pending_entry_connections
))
754 pending_entry_connections
= smartlist_new();
756 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
757 if (conn
->marked_for_close
||
758 conn
->type
!= CONN_TYPE_AP
||
759 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
762 entry_conn
= TO_ENTRY_CONN(conn
);
763 tor_assert(entry_conn
);
764 if (! smartlist_contains(pending_entry_connections
, entry_conn
)) {
765 log_warn(LD_BUG
, "Found a connection %p that was supposed to be "
766 "in pending_entry_connections, but wasn't. No worries; "
768 pending_entry_connections
);
769 untried_pending_connections
= 1;
770 connection_ap_mark_as_pending_circuit(entry_conn
);
773 } SMARTLIST_FOREACH_END(conn
);
775 connection_ap_attach_pending(1);
778 #ifdef DEBUGGING_17659
779 #define UNMARK() do { \
780 entry_conn->marked_pending_circ_line = 0; \
781 entry_conn->marked_pending_circ_file = 0; \
784 #define UNMARK() do { } while (0)
787 /** Tell any AP streams that are listed as waiting for a new circuit to try
788 * again, either attaching to an available circ or launching a new one.
790 * If <b>retry</b> is false, only check the list if it contains at least one
791 * streams that we have not yet tried to attach to a circuit.
794 connection_ap_attach_pending(int retry
)
796 if (PREDICT_UNLIKELY(!pending_entry_connections
)) {
800 if (untried_pending_connections
== 0 && !retry
)
803 /* Don't allow modifications to pending_entry_connections while we are
804 * iterating over it. */
805 smartlist_t
*pending
= pending_entry_connections
;
806 pending_entry_connections
= smartlist_new();
808 SMARTLIST_FOREACH_BEGIN(pending
,
809 entry_connection_t
*, entry_conn
) {
810 connection_t
*conn
= ENTRY_TO_CONN(entry_conn
);
811 tor_assert(conn
&& entry_conn
);
812 if (conn
->marked_for_close
) {
816 if (conn
->magic
!= ENTRY_CONNECTION_MAGIC
) {
817 log_warn(LD_BUG
, "%p has impossible magic value %u.",
818 entry_conn
, (unsigned)conn
->magic
);
822 if (conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
) {
823 log_warn(LD_BUG
, "%p is no longer in circuit_wait. Its current state "
824 "is %s. Why is it on pending_entry_connections?",
826 conn_state_to_string(conn
->type
, conn
->state
));
831 if (connection_ap_handshake_attach_circuit(entry_conn
) < 0) {
832 if (!conn
->marked_for_close
)
833 connection_mark_unattached_ap(entry_conn
,
834 END_STREAM_REASON_CANT_ATTACH
);
837 if (! conn
->marked_for_close
&&
838 conn
->type
== CONN_TYPE_AP
&&
839 conn
->state
== AP_CONN_STATE_CIRCUIT_WAIT
) {
840 if (!smartlist_contains(pending_entry_connections
, entry_conn
)) {
841 smartlist_add(pending_entry_connections
, entry_conn
);
847 } SMARTLIST_FOREACH_END(entry_conn
);
849 smartlist_free(pending
);
850 untried_pending_connections
= 0;
853 /** Mark <b>entry_conn</b> as needing to get attached to a circuit.
855 * And <b>entry_conn</b> must be in AP_CONN_STATE_CIRCUIT_WAIT,
856 * should not already be pending a circuit. The circuit will get
857 * launched or the connection will get attached the next time we
858 * call connection_ap_attach_pending().
861 connection_ap_mark_as_pending_circuit_(entry_connection_t
*entry_conn
,
862 const char *fname
, int lineno
)
864 connection_t
*conn
= ENTRY_TO_CONN(entry_conn
);
865 tor_assert(conn
->state
== AP_CONN_STATE_CIRCUIT_WAIT
);
866 tor_assert(conn
->magic
== ENTRY_CONNECTION_MAGIC
);
867 if (conn
->marked_for_close
)
870 if (PREDICT_UNLIKELY(NULL
== pending_entry_connections
))
871 pending_entry_connections
= smartlist_new();
873 if (PREDICT_UNLIKELY(smartlist_contains(pending_entry_connections
,
875 log_warn(LD_BUG
, "What?? pending_entry_connections already contains %p! "
876 "(Called from %s:%d.)",
877 entry_conn
, fname
, lineno
);
878 #ifdef DEBUGGING_17659
879 const char *f2
= entry_conn
->marked_pending_circ_file
;
880 log_warn(LD_BUG
, "(Previously called from %s:%d.)\n",
882 entry_conn
->marked_pending_circ_line
);
884 log_backtrace(LOG_WARN
, LD_BUG
, "To debug, this may help");
888 #ifdef DEBUGGING_17659
889 entry_conn
->marked_pending_circ_line
= (uint16_t) lineno
;
890 entry_conn
->marked_pending_circ_file
= fname
;
893 untried_pending_connections
= 1;
894 smartlist_add(pending_entry_connections
, entry_conn
);
897 /** Mark <b>entry_conn</b> as no longer waiting for a circuit. */
899 connection_ap_mark_as_non_pending_circuit(entry_connection_t
*entry_conn
)
901 if (PREDICT_UNLIKELY(NULL
== pending_entry_connections
))
904 smartlist_remove(pending_entry_connections
, entry_conn
);
909 connection_ap_warn_and_unmark_if_pending_circ(entry_connection_t
*entry_conn
,
912 if (pending_entry_connections
&&
913 smartlist_contains(pending_entry_connections
, entry_conn
)) {
914 log_warn(LD_BUG
, "What was %p doing in pending_entry_connections in %s?",
916 connection_ap_mark_as_non_pending_circuit(entry_conn
);
920 /** Tell any AP streams that are waiting for a one-hop tunnel to
921 * <b>failed_digest</b> that they are going to fail. */
922 /* XXX024 We should get rid of this function, and instead attach
923 * one-hop streams to circ->p_streams so they get marked in
924 * circuit_mark_for_close like normal p_streams. */
926 connection_ap_fail_onehop(const char *failed_digest
,
927 cpath_build_state_t
*build_state
)
929 entry_connection_t
*entry_conn
;
930 char digest
[DIGEST_LEN
];
931 smartlist_t
*conns
= get_connection_array();
932 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
933 if (conn
->marked_for_close
||
934 conn
->type
!= CONN_TYPE_AP
||
935 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
937 entry_conn
= TO_ENTRY_CONN(conn
);
938 if (!entry_conn
->want_onehop
)
940 if (hexdigest_to_digest(entry_conn
->chosen_exit_name
, digest
) < 0 ||
941 tor_memneq(digest
, failed_digest
, DIGEST_LEN
))
943 if (tor_digest_is_zero(digest
)) {
944 /* we don't know the digest; have to compare addr:port */
946 if (!build_state
|| !build_state
->chosen_exit
||
947 !entry_conn
->socks_request
) {
950 if (tor_addr_parse(&addr
, entry_conn
->socks_request
->address
)<0 ||
951 !tor_addr_eq(&build_state
->chosen_exit
->addr
, &addr
) ||
952 build_state
->chosen_exit
->port
!= entry_conn
->socks_request
->port
)
955 log_info(LD_APP
, "Closing one-hop stream to '%s/%s' because the OR conn "
956 "just failed.", entry_conn
->chosen_exit_name
,
957 entry_conn
->socks_request
->address
);
958 connection_mark_unattached_ap(entry_conn
, END_STREAM_REASON_TIMEOUT
);
959 } SMARTLIST_FOREACH_END(conn
);
962 /** A circuit failed to finish on its last hop <b>info</b>. If there
963 * are any streams waiting with this exit node in mind, but they
964 * don't absolutely require it, make them give up on it.
967 circuit_discard_optional_exit_enclaves(extend_info_t
*info
)
969 entry_connection_t
*entry_conn
;
970 const node_t
*r1
, *r2
;
972 smartlist_t
*conns
= get_connection_array();
973 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
974 if (conn
->marked_for_close
||
975 conn
->type
!= CONN_TYPE_AP
||
976 conn
->state
!= AP_CONN_STATE_CIRCUIT_WAIT
)
978 entry_conn
= TO_ENTRY_CONN(conn
);
979 if (!entry_conn
->chosen_exit_optional
&&
980 !entry_conn
->chosen_exit_retries
)
982 r1
= node_get_by_nickname(entry_conn
->chosen_exit_name
, 0);
983 r2
= node_get_by_id(info
->identity_digest
);
984 if (!r1
|| !r2
|| r1
!= r2
)
986 tor_assert(entry_conn
->socks_request
);
987 if (entry_conn
->chosen_exit_optional
) {
988 log_info(LD_APP
, "Giving up on enclave exit '%s' for destination %s.",
989 safe_str_client(entry_conn
->chosen_exit_name
),
990 escaped_safe_str_client(entry_conn
->socks_request
->address
));
991 entry_conn
->chosen_exit_optional
= 0;
992 tor_free(entry_conn
->chosen_exit_name
); /* clears it */
993 /* if this port is dangerous, warn or reject it now that we don't
994 * think it'll be using an enclave. */
995 consider_plaintext_ports(entry_conn
, entry_conn
->socks_request
->port
);
997 if (entry_conn
->chosen_exit_retries
) {
998 if (--entry_conn
->chosen_exit_retries
== 0) { /* give up! */
999 clear_trackexithost_mappings(entry_conn
->chosen_exit_name
);
1000 tor_free(entry_conn
->chosen_exit_name
); /* clears it */
1001 /* if this port is dangerous, warn or reject it now that we don't
1002 * think it'll be using an enclave. */
1003 consider_plaintext_ports(entry_conn
, entry_conn
->socks_request
->port
);
1006 } SMARTLIST_FOREACH_END(conn
);
1009 /** The AP connection <b>conn</b> has just failed while attaching or
1010 * sending a BEGIN or resolving on <b>circ</b>, but another circuit
1011 * might work. Detach the circuit, and either reattach it, launch a
1012 * new circuit, tell the controller, or give up as appropriate.
1014 * Returns -1 on err, 1 on success, 0 on not-yet-sure.
1017 connection_ap_detach_retriable(entry_connection_t
*conn
,
1018 origin_circuit_t
*circ
,
1021 control_event_stream_status(conn
, STREAM_EVENT_FAILED_RETRIABLE
, reason
);
1022 ENTRY_TO_CONN(conn
)->timestamp_lastread
= time(NULL
);
1024 /* Roll back path bias use state so that we probe the circuit
1025 * if nothing else succeeds on it */
1026 pathbias_mark_use_rollback(circ
);
1028 if (conn
->pending_optimistic_data
) {
1029 generic_buffer_set_to_copy(&conn
->sending_optimistic_data
,
1030 conn
->pending_optimistic_data
);
1033 if (!get_options()->LeaveStreamsUnattached
|| conn
->use_begindir
) {
1034 /* If we're attaching streams ourself, or if this connection is
1035 * a tunneled directory connection, then just attach it. */
1036 ENTRY_TO_CONN(conn
)->state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1037 circuit_detach_stream(TO_CIRCUIT(circ
),ENTRY_TO_EDGE_CONN(conn
));
1038 connection_ap_mark_as_pending_circuit(conn
);
1040 CONNECTION_AP_EXPECT_NONPENDING(conn
);
1041 ENTRY_TO_CONN(conn
)->state
= AP_CONN_STATE_CONTROLLER_WAIT
;
1042 circuit_detach_stream(TO_CIRCUIT(circ
),ENTRY_TO_EDGE_CONN(conn
));
1047 /** Check if <b>conn</b> is using a dangerous port. Then warn and/or
1048 * reject depending on our config options. */
1050 consider_plaintext_ports(entry_connection_t
*conn
, uint16_t port
)
1052 const or_options_t
*options
= get_options();
1053 int reject
= smartlist_contains_int_as_string(
1054 options
->RejectPlaintextPorts
, port
);
1056 if (smartlist_contains_int_as_string(options
->WarnPlaintextPorts
, port
)) {
1057 log_warn(LD_APP
, "Application request to port %d: this port is "
1058 "commonly used for unencrypted protocols. Please make sure "
1059 "you don't send anything you would mind the rest of the "
1060 "Internet reading!%s", port
, reject
? " Closing." : "");
1061 control_event_client_status(LOG_WARN
, "DANGEROUS_PORT PORT=%d RESULT=%s",
1062 port
, reject
? "REJECT" : "WARN");
1066 log_info(LD_APP
, "Port %d listed in RejectPlaintextPorts. Closing.", port
);
1067 connection_mark_unattached_ap(conn
, END_STREAM_REASON_ENTRYPOLICY
);
1074 /** How many times do we try connecting with an exit configured via
1075 * TrackHostExits before concluding that it won't work any more and trying a
1077 #define TRACKHOSTEXITS_RETRIES 5
1079 /** Call connection_ap_handshake_rewrite_and_attach() unless a controller
1080 * asked us to leave streams unattached. Return 0 in that case.
1082 * See connection_ap_handshake_rewrite_and_attach()'s
1083 * documentation for arguments and return value.
1086 connection_ap_rewrite_and_attach_if_allowed(entry_connection_t
*conn
,
1087 origin_circuit_t
*circ
,
1088 crypt_path_t
*cpath
)
1090 const or_options_t
*options
= get_options();
1092 if (options
->LeaveStreamsUnattached
) {
1093 CONNECTION_AP_EXPECT_NONPENDING(conn
);
1094 ENTRY_TO_CONN(conn
)->state
= AP_CONN_STATE_CONTROLLER_WAIT
;
1097 return connection_ap_handshake_rewrite_and_attach(conn
, circ
, cpath
);
1100 /* Try to perform any map-based rewriting of the target address in
1101 * <b>conn</b>, filling in the fields of <b>out</b> as we go, and modifying
1102 * conn->socks_request.address as appropriate.
1105 connection_ap_handshake_rewrite(entry_connection_t
*conn
,
1106 rewrite_result_t
*out
)
1108 socks_request_t
*socks
= conn
->socks_request
;
1109 const or_options_t
*options
= get_options();
1110 tor_addr_t addr_tmp
;
1112 /* Initialize all the fields of 'out' to reasonable defaults */
1114 out
->exit_source
= ADDRMAPSRC_NONE
;
1115 out
->map_expires
= TIME_MAX
;
1116 out
->end_reason
= 0;
1117 out
->should_close
= 0;
1118 out
->orig_address
[0] = 0;
1120 /* We convert all incoming addresses to lowercase. */
1121 tor_strlower(socks
->address
);
1122 /* Remember the original address. */
1123 strlcpy(out
->orig_address
, socks
->address
, sizeof(out
->orig_address
));
1124 log_debug(LD_APP
,"Client asked for %s:%d",
1125 safe_str_client(socks
->address
),
1128 /* Check for whether this is a .exit address. By default, those are
1129 * disallowed when they're coming straight from the client, but you're
1130 * allowed to have them in MapAddress commands and so forth. */
1131 if (!strcmpend(socks
->address
, ".exit") && !options
->AllowDotExit
) {
1132 log_warn(LD_APP
, "The \".exit\" notation is disabled in Tor due to "
1133 "security risks. Set AllowDotExit in your torrc to enable "
1134 "it (at your own risk).");
1135 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1136 escaped(socks
->address
));
1137 out
->end_reason
= END_STREAM_REASON_TORPROTOCOL
;
1138 out
->should_close
= 1;
1142 /* Remember the original address so we can tell the user about what
1143 * they actually said, not just what it turned into. */
1144 if (! conn
->original_dest_address
) {
1145 /* Is the 'if' necessary here? XXXX */
1146 conn
->original_dest_address
= tor_strdup(conn
->socks_request
->address
);
1149 /* First, apply MapAddress and MAPADDRESS mappings. We need to do
1150 * these only for non-reverse lookups, since they don't exist for those.
1151 * We need to do this before we consider automapping, since we might
1152 * e.g. resolve irc.oftc.net into irconionaddress.onion, at which point
1153 * we'd need to automap it. */
1154 if (socks
->command
!= SOCKS_COMMAND_RESOLVE_PTR
) {
1155 const unsigned rewrite_flags
= AMR_FLAG_USE_MAPADDRESS
;
1156 if (addressmap_rewrite(socks
->address
, sizeof(socks
->address
),
1157 rewrite_flags
, &out
->map_expires
, &out
->exit_source
)) {
1158 control_event_stream_status(conn
, STREAM_EVENT_REMAP
,
1159 REMAP_STREAM_SOURCE_CACHE
);
1163 /* Now, handle automapping. Automapping happens when we're asked to
1164 * resolve a hostname, and AutomapHostsOnResolve is set, and
1165 * the hostname has a suffix listed in AutomapHostsSuffixes.
1167 if (socks
->command
== SOCKS_COMMAND_RESOLVE
&&
1168 tor_addr_parse(&addr_tmp
, socks
->address
)<0 &&
1169 options
->AutomapHostsOnResolve
) {
1170 /* Check the suffix... */
1171 out
->automap
= addressmap_address_should_automap(socks
->address
, options
);
1173 /* If we get here, then we should apply an automapping for this. */
1174 const char *new_addr
;
1175 /* We return an IPv4 address by default, or an IPv6 address if we
1176 * are allowed to do so. */
1177 int addr_type
= RESOLVED_TYPE_IPV4
;
1178 if (conn
->socks_request
->socks_version
!= 4) {
1179 if (!conn
->entry_cfg
.ipv4_traffic
||
1180 (conn
->entry_cfg
.ipv6_traffic
&& conn
->entry_cfg
.prefer_ipv6
) ||
1181 conn
->entry_cfg
.prefer_ipv6_virtaddr
)
1182 addr_type
= RESOLVED_TYPE_IPV6
;
1184 /* Okay, register the target address as automapped, and find the new
1185 * address we're supposed to give as a resolve answer. (Return a cached
1186 * value if we've looked up this address before.
1188 new_addr
= addressmap_register_virtual_address(
1189 addr_type
, tor_strdup(socks
->address
));
1191 log_warn(LD_APP
, "Unable to automap address %s",
1192 escaped_safe_str(socks
->address
));
1193 out
->end_reason
= END_STREAM_REASON_INTERNAL
;
1194 out
->should_close
= 1;
1197 log_info(LD_APP
, "Automapping %s to %s",
1198 escaped_safe_str_client(socks
->address
),
1199 safe_str_client(new_addr
));
1200 strlcpy(socks
->address
, new_addr
, sizeof(socks
->address
));
1204 /* Now handle reverse lookups, if they're in the cache. This doesn't
1205 * happen too often, since client-side DNS caching is off by default. */
1206 if (socks
->command
== SOCKS_COMMAND_RESOLVE_PTR
) {
1207 unsigned rewrite_flags
= 0;
1208 if (conn
->entry_cfg
.use_cached_ipv4_answers
)
1209 rewrite_flags
|= AMR_FLAG_USE_IPV4_DNS
;
1210 if (conn
->entry_cfg
.use_cached_ipv6_answers
)
1211 rewrite_flags
|= AMR_FLAG_USE_IPV6_DNS
;
1213 if (addressmap_rewrite_reverse(socks
->address
, sizeof(socks
->address
),
1214 rewrite_flags
, &out
->map_expires
)) {
1215 char *result
= tor_strdup(socks
->address
);
1216 /* remember _what_ is supposed to have been resolved. */
1217 tor_snprintf(socks
->address
, sizeof(socks
->address
), "REVERSE[%s]",
1219 connection_ap_handshake_socks_resolved(conn
, RESOLVED_TYPE_HOSTNAME
,
1220 strlen(result
), (uint8_t*)result
,
1224 out
->end_reason
= END_STREAM_REASON_DONE
|
1225 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
;
1226 out
->should_close
= 1;
1230 /* Hang on, did we find an answer saying that this is a reverse lookup for
1231 * an internal address? If so, we should reject it if we're condigured to
1233 if (options
->ClientDNSRejectInternalAddresses
) {
1234 /* Don't let people try to do a reverse lookup on 10.0.0.1. */
1237 ok
= tor_addr_parse_PTR_name(
1238 &addr
, socks
->address
, AF_UNSPEC
, 1);
1239 if (ok
== 1 && tor_addr_is_internal(&addr
, 0)) {
1240 connection_ap_handshake_socks_resolved(conn
, RESOLVED_TYPE_ERROR
,
1241 0, NULL
, -1, TIME_MAX
);
1242 out
->end_reason
= END_STREAM_REASON_SOCKSPROTOCOL
|
1243 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
;
1244 out
->should_close
= 1;
1250 /* If we didn't automap it before, then this is still the address
1251 * that came straight from the user, mapped according to any
1252 * MapAddress/MAPADDRESS commands. Now other mappings, including
1253 * previously registered Automap entries, TrackHostExits entries,
1254 * and client-side DNS cache entries (not recommended).
1256 if (socks
->command
!= SOCKS_COMMAND_RESOLVE_PTR
&&
1258 unsigned rewrite_flags
= AMR_FLAG_USE_AUTOMAP
| AMR_FLAG_USE_TRACKEXIT
;
1259 addressmap_entry_source_t exit_source2
;
1260 if (conn
->entry_cfg
.use_cached_ipv4_answers
)
1261 rewrite_flags
|= AMR_FLAG_USE_IPV4_DNS
;
1262 if (conn
->entry_cfg
.use_cached_ipv6_answers
)
1263 rewrite_flags
|= AMR_FLAG_USE_IPV6_DNS
;
1264 if (addressmap_rewrite(socks
->address
, sizeof(socks
->address
),
1265 rewrite_flags
, &out
->map_expires
, &exit_source2
)) {
1266 control_event_stream_status(conn
, STREAM_EVENT_REMAP
,
1267 REMAP_STREAM_SOURCE_CACHE
);
1269 if (out
->exit_source
== ADDRMAPSRC_NONE
) {
1270 /* If it wasn't a .exit before, maybe it turned into a .exit. Remember
1271 * the original source of a .exit. */
1272 out
->exit_source
= exit_source2
;
1276 /* Check to see whether we're about to use an address in the virtual
1277 * range without actually having gotten it from an Automap. */
1278 if (!out
->automap
&& address_is_in_virtual_range(socks
->address
)) {
1279 /* This address was probably handed out by
1280 * client_dns_get_unmapped_address, but the mapping was discarded for some
1281 * reason. Or the user typed in a virtual address range manually. We
1282 * *don't* want to send the address through Tor; that's likely to fail,
1283 * and may leak information.
1285 log_warn(LD_APP
,"Missing mapping for virtual address '%s'. Refusing.",
1286 safe_str_client(socks
->address
));
1287 out
->end_reason
= END_STREAM_REASON_INTERNAL
;
1288 out
->should_close
= 1;
1293 /** Connection <b>conn</b> just finished its socks handshake, or the
1294 * controller asked us to take care of it. If <b>circ</b> is defined,
1295 * then that's where we'll want to attach it. Otherwise we have to
1296 * figure it out ourselves.
1298 * First, parse whether it's a .exit address, remap it, and so on. Then
1299 * if it's for a general circuit, try to attach it to a circuit (or launch
1300 * one as needed), else if it's for a rendezvous circuit, fetch a
1301 * rendezvous descriptor first (or attach/launch a circuit if the
1302 * rendezvous descriptor is already here and fresh enough).
1304 * The stream will exit from the hop
1305 * indicated by <b>cpath</b>, or from the last hop in circ's cpath if
1306 * <b>cpath</b> is NULL.
1309 connection_ap_handshake_rewrite_and_attach(entry_connection_t
*conn
,
1310 origin_circuit_t
*circ
,
1311 crypt_path_t
*cpath
)
1313 socks_request_t
*socks
= conn
->socks_request
;
1314 const or_options_t
*options
= get_options();
1315 connection_t
*base_conn
= ENTRY_TO_CONN(conn
);
1316 time_t now
= time(NULL
);
1317 rewrite_result_t rr
;
1319 memset(&rr
, 0, sizeof(rr
));
1320 connection_ap_handshake_rewrite(conn
,&rr
);
1322 if (rr
.should_close
) {
1323 /* connection_ap_handshake_rewrite told us to close the connection,
1324 * either because it sent back an answer, or because it sent back an
1326 connection_mark_unattached_ap(conn
, rr
.end_reason
);
1327 if (END_STREAM_REASON_DONE
== (rr
.end_reason
& END_STREAM_REASON_MASK
))
1333 const time_t map_expires
= rr
.map_expires
;
1334 const int automap
= rr
.automap
;
1335 const addressmap_entry_source_t exit_source
= rr
.exit_source
;
1337 /* Parse the address provided by SOCKS. Modify it in-place if it
1338 * specifies a hidden-service (.onion) or particular exit node (.exit).
1340 const hostname_type_t addresstype
= parse_extended_hostname(socks
->address
);
1342 /* Now see whether the hostname is bogus. This could happen because of an
1343 * onion hostname whose format we don't recognize. */
1344 if (addresstype
== BAD_HOSTNAME
) {
1345 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1346 escaped(socks
->address
));
1347 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1351 /* If this is a .exit hostname, strip off the .name.exit part, and
1352 * see whether we're going to connect there, and otherwise handle it.
1353 * (The ".exit" part got stripped off by "parse_extended_hostname").
1355 * We'll set chosen_exit_name and/or close the connection as appropriate.
1357 if (addresstype
== EXIT_HOSTNAME
) {
1358 /* If StrictNodes is not set, then .exit overrides ExcludeNodes but
1359 * not ExcludeExitNodes. */
1360 routerset_t
*excludeset
= options
->StrictNodes
?
1361 options
->ExcludeExitNodesUnion_
: options
->ExcludeExitNodes
;
1362 const node_t
*node
= NULL
;
1364 /* If this .exit was added by an AUTOMAP, then it came straight from
1365 * a user. Make sure that options->AllowDotExit permits that. */
1366 if (exit_source
== ADDRMAPSRC_AUTOMAP
&& !options
->AllowDotExit
) {
1367 /* Whoops; this one is stale. It must have gotten added earlier,
1368 * when AllowDotExit was on. */
1369 log_warn(LD_APP
,"Stale automapped address for '%s.exit', with "
1370 "AllowDotExit disabled. Refusing.",
1371 safe_str_client(socks
->address
));
1372 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1373 escaped(socks
->address
));
1374 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1378 /* Double-check to make sure there are no .exits coming from
1379 * impossible/weird sources. */
1380 if (exit_source
== ADDRMAPSRC_DNS
||
1381 (exit_source
== ADDRMAPSRC_NONE
&& !options
->AllowDotExit
)) {
1382 /* It shouldn't be possible to get a .exit address from any of these
1384 log_warn(LD_BUG
,"Address '%s.exit', with impossible source for the "
1385 ".exit part. Refusing.",
1386 safe_str_client(socks
->address
));
1387 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1388 escaped(socks
->address
));
1389 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1393 tor_assert(!automap
);
1394 /* Now, find the character before the .(name) part. */
1395 char *s
= strrchr(socks
->address
,'.');
1397 /* The address was of the form "(stuff).(name).exit */
1399 /* Looks like a real .exit one. */
1400 conn
->chosen_exit_name
= tor_strdup(s
+1);
1401 node
= node_get_by_nickname(conn
->chosen_exit_name
, 1);
1403 if (exit_source
== ADDRMAPSRC_TRACKEXIT
) {
1404 /* We 5 tries before it expires the addressmap */
1405 conn
->chosen_exit_retries
= TRACKHOSTEXITS_RETRIES
;
1409 /* Oops, the address was (stuff)..exit. That's not okay. */
1410 log_warn(LD_APP
,"Malformed exit address '%s.exit'. Refusing.",
1411 safe_str_client(socks
->address
));
1412 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1413 escaped(socks
->address
));
1414 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1418 /* It looks like they just asked for "foo.exit". That's a special
1419 * form that means (foo's address).foo.exit. */
1421 conn
->chosen_exit_name
= tor_strdup(socks
->address
);
1422 node
= node_get_by_nickname(conn
->chosen_exit_name
, 1);
1424 *socks
->address
= 0;
1425 node_get_address_string(node
, socks
->address
, sizeof(socks
->address
));
1429 /* Now make sure that the chosen exit exists... */
1432 "Unrecognized relay in exit address '%s.exit'. Refusing.",
1433 safe_str_client(socks
->address
));
1434 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1437 /* ...and make sure that it isn't excluded. */
1438 if (routerset_contains_node(excludeset
, node
)) {
1440 "Excluded relay in exit address '%s.exit'. Refusing.",
1441 safe_str_client(socks
->address
));
1442 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1445 /* XXXX024-1090 Should we also allow foo.bar.exit if ExitNodes is set and
1446 Bar is not listed in it? I say yes, but our revised manpage branch
1450 /* Now, handle everything that isn't a .onion address. */
1451 if (addresstype
!= ONION_HOSTNAME
) {
1452 /* Not a hidden-service request. It's either a hostname or an IP,
1453 * possibly with a .exit that we stripped off. */
1455 /* Check for funny characters in the address. */
1456 if (address_is_invalid_destination(socks
->address
, 1)) {
1457 control_event_client_status(LOG_WARN
, "SOCKS_BAD_HOSTNAME HOSTNAME=%s",
1458 escaped(socks
->address
));
1460 "Destination '%s' seems to be an invalid hostname. Failing.",
1461 safe_str_client(socks
->address
));
1462 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1466 #ifdef ENABLE_TOR2WEB_MODE
1467 /* If we're running in Tor2webMode, we don't allow anything BUT .onion
1469 if (options
->Tor2webMode
) {
1470 log_warn(LD_APP
, "Refusing to connect to non-hidden-service hostname %s "
1471 "because tor2web mode is enabled.",
1472 safe_str_client(socks
->address
));
1473 connection_mark_unattached_ap(conn
, END_STREAM_REASON_ENTRYPOLICY
);
1478 /* See if this is a hostname lookup that we can answer immediately.
1479 * (For example, an attempt to look up the IP address for an IP address.)
1481 if (socks
->command
== SOCKS_COMMAND_RESOLVE
) {
1483 /* Reply to resolves immediately if we can. */
1484 if (tor_addr_parse(&answer
, socks
->address
) >= 0) {/* is it an IP? */
1485 /* remember _what_ is supposed to have been resolved. */
1486 strlcpy(socks
->address
, rr
.orig_address
, sizeof(socks
->address
));
1487 connection_ap_handshake_socks_resolved_addr(conn
, &answer
, -1,
1489 connection_mark_unattached_ap(conn
,
1490 END_STREAM_REASON_DONE
|
1491 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1494 tor_assert(!automap
);
1495 rep_hist_note_used_resolve(now
); /* help predict this next time */
1496 } else if (socks
->command
== SOCKS_COMMAND_CONNECT
) {
1497 /* Special handling for attempts to connect */
1498 tor_assert(!automap
);
1499 /* Don't allow connections to port 0. */
1500 if (socks
->port
== 0) {
1501 log_notice(LD_APP
,"Application asked to connect to port 0. Refusing.");
1502 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1505 /* You can't make connections to internal addresses, by default.
1506 * Exceptions are begindir requests (where the address is meaningless,
1507 * or cases where you've hand-configured a particular exit, thereby
1508 * making the local address meaningful. */
1509 if (options
->ClientRejectInternalAddresses
&&
1510 !conn
->use_begindir
&& !conn
->chosen_exit_name
&& !circ
) {
1511 /* If we reach this point then we don't want to allow internal
1512 * addresses. Check if we got one. */
1514 if (tor_addr_hostname_is_local(socks
->address
) ||
1515 (tor_addr_parse(&addr
, socks
->address
) >= 0 &&
1516 tor_addr_is_internal(&addr
, 0))) {
1517 /* If this is an explicit private address with no chosen exit node,
1518 * then we really don't want to try to connect to it. That's
1519 * probably an error. */
1520 if (conn
->is_transparent_ap
) {
1521 #define WARN_INTRVL_LOOP 300
1522 static ratelim_t loop_warn_limit
= RATELIM_INIT(WARN_INTRVL_LOOP
);
1524 if ((m
= rate_limit_log(&loop_warn_limit
, approx_time()))) {
1526 "Rejecting request for anonymous connection to private "
1527 "address %s on a TransPort or NATDPort. Possible loop "
1528 "in your NAT rules?%s", safe_str_client(socks
->address
),
1533 #define WARN_INTRVL_PRIV 300
1534 static ratelim_t priv_warn_limit
= RATELIM_INIT(WARN_INTRVL_PRIV
);
1536 if ((m
= rate_limit_log(&priv_warn_limit
, approx_time()))) {
1538 "Rejecting SOCKS request for anonymous connection to "
1539 "private address %s.%s",
1540 safe_str_client(socks
->address
),m
);
1544 connection_mark_unattached_ap(conn
, END_STREAM_REASON_PRIVATE_ADDR
);
1547 } /* end "if we should check for internal addresses" */
1549 /* Okay. We're still doing a CONNECT, and it wasn't a private
1550 * address. Do special handling for literal IP addresses */
1553 /* XXX Duplicate call to tor_addr_parse. */
1554 if (tor_addr_parse(&addr
, socks
->address
) >= 0) {
1555 /* If we reach this point, it's an IPv4 or an IPv6 address. */
1556 sa_family_t family
= tor_addr_family(&addr
);
1558 if ((family
== AF_INET
&& ! conn
->entry_cfg
.ipv4_traffic
) ||
1559 (family
== AF_INET6
&& ! conn
->entry_cfg
.ipv6_traffic
)) {
1560 /* You can't do an IPv4 address on a v6-only socks listener,
1562 log_warn(LD_NET
, "Rejecting SOCKS request for an IP address "
1563 "family that this listener does not support.");
1564 connection_mark_unattached_ap(conn
, END_STREAM_REASON_ENTRYPOLICY
);
1566 } else if (family
== AF_INET6
&& socks
->socks_version
== 4) {
1567 /* You can't make a socks4 request to an IPv6 address. Socks4
1568 * doesn't support that. */
1569 log_warn(LD_NET
, "Rejecting SOCKS4 request for an IPv6 address.");
1570 connection_mark_unattached_ap(conn
, END_STREAM_REASON_ENTRYPOLICY
);
1572 } else if (socks
->socks_version
== 4 &&
1573 !conn
->entry_cfg
.ipv4_traffic
) {
1574 /* You can't do any kind of Socks4 request when IPv4 is forbidden.
1576 * XXX raise this check outside the enclosing block? */
1577 log_warn(LD_NET
, "Rejecting SOCKS4 request on a listener with "
1578 "no IPv4 traffic supported.");
1579 connection_mark_unattached_ap(conn
, END_STREAM_REASON_ENTRYPOLICY
);
1581 } else if (family
== AF_INET6
) {
1582 /* Tell the exit: we won't accept any ipv4 connection to an IPv6
1584 conn
->entry_cfg
.ipv4_traffic
= 0;
1585 } else if (family
== AF_INET
) {
1586 /* Tell the exit: we won't accept any ipv6 connection to an IPv4
1588 conn
->entry_cfg
.ipv6_traffic
= 0;
1593 if (socks
->socks_version
== 4)
1594 conn
->entry_cfg
.ipv6_traffic
= 0;
1596 /* Still handling CONNECT. Now, check for exit enclaves. (Which we
1597 * don't do on BEGINDIR, or there is a chosen exit.)
1599 if (!conn
->use_begindir
&& !conn
->chosen_exit_name
&& !circ
) {
1600 /* see if we can find a suitable enclave exit */
1602 router_find_exact_exit_enclave(socks
->address
, socks
->port
);
1605 "Redirecting address %s to exit at enclave router %s",
1606 safe_str_client(socks
->address
), node_describe(r
));
1607 /* use the hex digest, not nickname, in case there are two
1608 routers with this nickname */
1609 conn
->chosen_exit_name
=
1610 tor_strdup(hex_str(r
->identity
, DIGEST_LEN
));
1611 conn
->chosen_exit_optional
= 1;
1615 /* Still handling CONNECT: warn or reject if it's using a dangerous
1617 if (!conn
->use_begindir
&& !conn
->chosen_exit_name
&& !circ
)
1618 if (consider_plaintext_ports(conn
, socks
->port
) < 0)
1621 /* Remember the port so that we do predicted requests there. */
1622 if (!conn
->use_begindir
) {
1623 /* help predict this next time */
1624 rep_hist_note_used_port(now
, socks
->port
);
1626 } else if (socks
->command
== SOCKS_COMMAND_RESOLVE_PTR
) {
1627 rep_hist_note_used_resolve(now
); /* help predict this next time */
1628 /* no extra processing needed */
1630 /* We should only be doing CONNECT or RESOLVE! */
1631 tor_fragile_assert();
1634 /* Okay. At this point we've set chosen_exit_name if needed, rewritten the
1635 * address, and decided not to reject it for any number of reasons. Now
1636 * mark the connection as waiting for a circuit, and try to attach it!
1638 base_conn
->state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1640 /* If we were given a circuit to attach to, try to attach. Otherwise,
1641 * try to find a good one and attach to that. */
1644 rv
= connection_ap_handshake_attach_chosen_circuit(conn
, circ
, cpath
);
1646 connection_ap_mark_as_pending_circuit(conn
);
1650 /* If the above function returned 0 then we're waiting for a circuit.
1651 * if it returned 1, we're attached. Both are okay. But if it returned
1652 * -1, there was an error, so make sure the connection is marked, and
1655 if (!base_conn
->marked_for_close
)
1656 connection_mark_unattached_ap(conn
, END_STREAM_REASON_CANT_ATTACH
);
1662 /* If we get here, it's a request for a .onion address! */
1663 tor_assert(!automap
);
1665 /* Check whether it's RESOLVE or RESOLVE_PTR. We don't handle those
1666 * for hidden service addresses. */
1667 if (SOCKS_COMMAND_IS_RESOLVE(socks
->command
)) {
1668 /* if it's a resolve request, fail it right now, rather than
1669 * building all the circuits and then realizing it won't work. */
1671 "Resolve requests to hidden services not allowed. Failing.");
1672 connection_ap_handshake_socks_resolved(conn
,RESOLVED_TYPE_ERROR
,
1673 0,NULL
,-1,TIME_MAX
);
1674 connection_mark_unattached_ap(conn
,
1675 END_STREAM_REASON_SOCKSPROTOCOL
|
1676 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
1680 /* If we were passed a circuit, then we need to fail. .onion addresses
1681 * only work when we launch our own circuits for now. */
1683 log_warn(LD_CONTROL
, "Attachstream to a circuit is not "
1684 "supported for .onion addresses currently. Failing.");
1685 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1689 /* Look up if we have client authorization configured for this hidden
1690 * service. If we do, associate it with the rend_data. */
1691 rend_service_authorization_t
*client_auth
=
1692 rend_client_lookup_service_authorization(socks
->address
);
1694 const char *cookie
= NULL
;
1695 rend_auth_type_t auth_type
= REND_NO_AUTH
;
1697 log_info(LD_REND
, "Using previously configured client authorization "
1698 "for hidden service request.");
1699 auth_type
= client_auth
->auth_type
;
1700 cookie
= client_auth
->descriptor_cookie
;
1703 /* Fill in the rend_data field so we can start doing a connection to
1704 * a hidden service. */
1705 rend_data_t
*rend_data
= ENTRY_TO_EDGE_CONN(conn
)->rend_data
=
1706 rend_data_client_create(socks
->address
, NULL
, cookie
, auth_type
);
1707 if (rend_data
== NULL
) {
1710 log_info(LD_REND
,"Got a hidden service request for ID '%s'",
1711 safe_str_client(rend_data
->onion_address
));
1713 /* Lookup the given onion address. If invalid, stop right now else we
1714 * might have it in the cache or not, it will be tested later on. */
1715 unsigned int refetch_desc
= 0;
1716 rend_cache_entry_t
*entry
= NULL
;
1717 const int rend_cache_lookup_result
=
1718 rend_cache_lookup_entry(rend_data
->onion_address
, -1, &entry
);
1719 if (rend_cache_lookup_result
< 0) {
1720 switch (-rend_cache_lookup_result
) {
1722 /* We should already have rejected this address! */
1723 log_warn(LD_BUG
,"Invalid service name '%s'",
1724 safe_str_client(rend_data
->onion_address
));
1725 connection_mark_unattached_ap(conn
, END_STREAM_REASON_TORPROTOCOL
);
1731 log_warn(LD_BUG
, "Unknown cache lookup error %d",
1732 rend_cache_lookup_result
);
1737 /* Help predict this next time. We're not sure if it will need
1738 * a stable circuit yet, but we know we'll need *something*. */
1739 rep_hist_note_used_internal(now
, 0, 1);
1741 /* Now we have a descriptor but is it usable or not? If not, refetch.
1742 * Also, a fetch could have been requested if the onion address was not
1743 * found in the cache previously. */
1744 if (refetch_desc
|| !rend_client_any_intro_points_usable(entry
)) {
1745 connection_ap_mark_as_non_pending_circuit(conn
);
1746 base_conn
->state
= AP_CONN_STATE_RENDDESC_WAIT
;
1747 log_info(LD_REND
, "Unknown descriptor %s. Fetching.",
1748 safe_str_client(rend_data
->onion_address
));
1749 rend_client_refetch_v2_renddesc(rend_data
);
1753 /* We have the descriptor so launch a connection to the HS. */
1754 base_conn
->state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1755 log_info(LD_REND
, "Descriptor is here. Great.");
1756 connection_ap_mark_as_pending_circuit(conn
);
1760 return 0; /* unreached but keeps the compiler happy */
1764 static int pf_socket
= -1;
1769 /* This should be opened before dropping privileges. */
1774 /* only works on OpenBSD */
1775 pf
= tor_open_cloexec("/dev/pf", O_RDONLY
, 0);
1777 /* works on NetBSD and FreeBSD */
1778 pf
= tor_open_cloexec("/dev/pf", O_RDWR
, 0);
1782 log_warn(LD_NET
, "open(\"/dev/pf\") failed: %s", strerror(errno
));
1791 #if defined(TRANS_NETFILTER) || defined(TRANS_PF) || defined(TRANS_TPROXY)
1792 /** Try fill in the address of <b>req</b> from the socket configured
1793 * with <b>conn</b>. */
1795 destination_from_socket(entry_connection_t
*conn
, socks_request_t
*req
)
1797 struct sockaddr_storage orig_dst
;
1798 socklen_t orig_dst_len
= sizeof(orig_dst
);
1802 if (options
->TransProxyType_parsed
== TPT_TPROXY
) {
1803 if (getsockname(ENTRY_TO_CONN(conn
)->s
, (struct sockaddr
*)&orig_dst
,
1804 &orig_dst_len
) < 0) {
1805 int e
= tor_socket_errno(ENTRY_TO_CONN(conn
)->s
);
1806 log_warn(LD_NET
, "getsockname() failed: %s", tor_socket_strerror(e
));
1813 #ifdef TRANS_NETFILTER
1815 switch (ENTRY_TO_CONN(conn
)->socket_family
) {
1816 #ifdef TRANS_NETFILTER_IPV4
1818 rv
= getsockopt(ENTRY_TO_CONN(conn
)->s
, SOL_IP
, SO_ORIGINAL_DST
,
1819 (struct sockaddr
*)&orig_dst
, &orig_dst_len
);
1822 #ifdef TRANS_NETFILTER_IPV6
1824 rv
= getsockopt(ENTRY_TO_CONN(conn
)->s
, SOL_IPV6
, IP6T_SO_ORIGINAL_DST
,
1825 (struct sockaddr
*)&orig_dst
, &orig_dst_len
);
1830 "Received transparent data from an unsuported socket family %d",
1831 ENTRY_TO_CONN(conn
)->socket_family
);
1835 int e
= tor_socket_errno(ENTRY_TO_CONN(conn
)->s
);
1836 log_warn(LD_NET
, "getsockopt() failed: %s", tor_socket_strerror(e
));
1840 #elif defined(TRANS_PF)
1841 if (getsockname(ENTRY_TO_CONN(conn
)->s
, (struct sockaddr
*)&orig_dst
,
1842 &orig_dst_len
) < 0) {
1843 int e
= tor_socket_errno(ENTRY_TO_CONN(conn
)->s
);
1844 log_warn(LD_NET
, "getsockname() failed: %s", tor_socket_strerror(e
));
1851 log_warn(LD_BUG
, "Unable to determine destination from socket.");
1856 tor_addr_from_sockaddr(&addr
, (struct sockaddr
*)&orig_dst
, &req
->port
);
1857 tor_addr_to_str(req
->address
, &addr
, sizeof(req
->address
), 1);
1865 destination_from_pf(entry_connection_t
*conn
, socks_request_t
*req
)
1867 struct sockaddr_storage proxy_addr
;
1868 socklen_t proxy_addr_len
= sizeof(proxy_addr
);
1869 struct sockaddr
*proxy_sa
= (struct sockaddr
*) &proxy_addr
;
1870 struct pfioc_natlook pnl
;
1874 if (getsockname(ENTRY_TO_CONN(conn
)->s
, (struct sockaddr
*)&proxy_addr
,
1875 &proxy_addr_len
) < 0) {
1876 int e
= tor_socket_errno(ENTRY_TO_CONN(conn
)->s
);
1877 log_warn(LD_NET
, "getsockname() to determine transocks destination "
1878 "failed: %s", tor_socket_strerror(e
));
1883 if (get_options()->TransProxyType_parsed
== TPT_IPFW
) {
1884 /* ipfw(8) is used and in this case getsockname returned the original
1886 if (tor_addr_from_sockaddr(&addr
, proxy_sa
, &req
->port
) < 0) {
1887 tor_fragile_assert();
1891 tor_addr_to_str(req
->address
, &addr
, sizeof(req
->address
), 0);
1897 memset(&pnl
, 0, sizeof(pnl
));
1898 pnl
.proto
= IPPROTO_TCP
;
1899 pnl
.direction
= PF_OUT
;
1900 if (proxy_sa
->sa_family
== AF_INET
) {
1901 struct sockaddr_in
*sin
= (struct sockaddr_in
*)proxy_sa
;
1903 pnl
.saddr
.v4
.s_addr
= tor_addr_to_ipv4n(&ENTRY_TO_CONN(conn
)->addr
);
1904 pnl
.sport
= htons(ENTRY_TO_CONN(conn
)->port
);
1905 pnl
.daddr
.v4
.s_addr
= sin
->sin_addr
.s_addr
;
1906 pnl
.dport
= sin
->sin_port
;
1907 } else if (proxy_sa
->sa_family
== AF_INET6
) {
1908 struct sockaddr_in6
*sin6
= (struct sockaddr_in6
*)proxy_sa
;
1910 memcpy(&pnl
.saddr
.v6
, tor_addr_to_in6(&ENTRY_TO_CONN(conn
)->addr
),
1911 sizeof(struct in6_addr
));
1912 pnl
.sport
= htons(ENTRY_TO_CONN(conn
)->port
);
1913 memcpy(&pnl
.daddr
.v6
, &sin6
->sin6_addr
, sizeof(struct in6_addr
));
1914 pnl
.dport
= sin6
->sin6_port
;
1916 log_warn(LD_NET
, "getsockname() gave an unexpected address family (%d)",
1917 (int)proxy_sa
->sa_family
);
1921 pf
= get_pf_socket();
1925 if (ioctl(pf
, DIOCNATLOOK
, &pnl
) < 0) {
1926 log_warn(LD_NET
, "ioctl(DIOCNATLOOK) failed: %s", strerror(errno
));
1930 if (pnl
.af
== AF_INET
) {
1931 tor_addr_from_ipv4n(&addr
, pnl
.rdaddr
.v4
.s_addr
);
1932 } else if (pnl
.af
== AF_INET6
) {
1933 tor_addr_from_in6(&addr
, &pnl
.rdaddr
.v6
);
1935 tor_fragile_assert();
1939 tor_addr_to_str(req
->address
, &addr
, sizeof(req
->address
), 1);
1940 req
->port
= ntohs(pnl
.rdport
);
1946 /** Fetch the original destination address and port from a
1947 * system-specific interface and put them into a
1948 * socks_request_t as if they came from a socks request.
1950 * Return -1 if an error prevents fetching the destination,
1954 connection_ap_get_original_destination(entry_connection_t
*conn
,
1955 socks_request_t
*req
)
1957 #ifdef TRANS_NETFILTER
1958 return destination_from_socket(conn
, req
);
1959 #elif defined(TRANS_PF)
1960 const or_options_t
*options
= get_options();
1962 if (options
->TransProxyType_parsed
== TPT_PF_DIVERT
)
1963 return destination_from_socket(conn
, req
);
1965 if (options
->TransProxyType_parsed
== TPT_DEFAULT
||
1966 options
->TransProxyType_parsed
== TPT_IPFW
)
1967 return destination_from_pf(conn
, req
);
1971 log_warn(LD_BUG
, "Proxy destination determination mechanism %s unknown.",
1972 options
->TransProxyType
);
1977 log_warn(LD_BUG
, "Called connection_ap_get_original_destination, but no "
1978 "transparent proxy method was configured.");
1983 /** connection_edge_process_inbuf() found a conn in state
1984 * socks_wait. See if conn->inbuf has the right bytes to proceed with
1985 * the socks handshake.
1987 * If the handshake is complete, send it to
1988 * connection_ap_handshake_rewrite_and_attach().
1990 * Return -1 if an unexpected error with conn occurs (and mark it for close),
1994 connection_ap_handshake_process_socks(entry_connection_t
*conn
)
1996 socks_request_t
*socks
;
1998 const or_options_t
*options
= get_options();
2000 connection_t
*base_conn
= ENTRY_TO_CONN(conn
);
2003 tor_assert(base_conn
->type
== CONN_TYPE_AP
);
2004 tor_assert(base_conn
->state
== AP_CONN_STATE_SOCKS_WAIT
);
2005 tor_assert(conn
->socks_request
);
2006 socks
= conn
->socks_request
;
2008 log_debug(LD_APP
,"entered.");
2010 IF_HAS_BUFFEREVENT(base_conn
, {
2011 struct evbuffer
*input
= bufferevent_get_input(base_conn
->bufev
);
2012 sockshere
= fetch_from_evbuffer_socks(input
, socks
,
2013 options
->TestSocks
, options
->SafeSocks
);
2014 }) ELSE_IF_NO_BUFFEREVENT
{
2015 sockshere
= fetch_from_buf_socks(base_conn
->inbuf
, socks
,
2016 options
->TestSocks
, options
->SafeSocks
);
2019 if (socks
->replylen
) {
2021 connection_write_to_buf((const char*)socks
->reply
, socks
->replylen
,
2023 socks
->replylen
= 0;
2024 if (sockshere
== -1) {
2025 /* An invalid request just got a reply, no additional
2026 * one is necessary. */
2027 socks
->has_finished
= 1;
2031 if (sockshere
== 0) {
2032 log_debug(LD_APP
,"socks handshake not all here yet.");
2034 } else if (sockshere
== -1) {
2036 log_warn(LD_APP
,"Fetching socks handshake failed. Closing.");
2037 connection_ap_handshake_socks_reply(conn
, NULL
, 0,
2038 END_STREAM_REASON_SOCKSPROTOCOL
);
2040 connection_mark_unattached_ap(conn
,
2041 END_STREAM_REASON_SOCKSPROTOCOL
|
2042 END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED
);
2044 } /* else socks handshake is done, continue processing */
2046 if (SOCKS_COMMAND_IS_CONNECT(socks
->command
))
2047 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2049 control_event_stream_status(conn
, STREAM_EVENT_NEW_RESOLVE
, 0);
2051 return connection_ap_rewrite_and_attach_if_allowed(conn
, NULL
, NULL
);
2054 /** connection_init_accepted_conn() found a new trans AP conn.
2055 * Get the original destination and send it to
2056 * connection_ap_handshake_rewrite_and_attach().
2058 * Return -1 if an unexpected error with conn (and it should be marked
2059 * for close), else return 0.
2062 connection_ap_process_transparent(entry_connection_t
*conn
)
2064 socks_request_t
*socks
;
2067 tor_assert(conn
->socks_request
);
2068 socks
= conn
->socks_request
;
2070 /* pretend that a socks handshake completed so we don't try to
2071 * send a socks reply down a transparent conn */
2072 socks
->command
= SOCKS_COMMAND_CONNECT
;
2073 socks
->has_finished
= 1;
2075 log_debug(LD_APP
,"entered.");
2077 if (connection_ap_get_original_destination(conn
, socks
) < 0) {
2078 log_warn(LD_APP
,"Fetching original destination failed. Closing.");
2079 connection_mark_unattached_ap(conn
,
2080 END_STREAM_REASON_CANT_FETCH_ORIG_DEST
);
2083 /* we have the original destination */
2085 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2087 return connection_ap_rewrite_and_attach_if_allowed(conn
, NULL
, NULL
);
2090 /** connection_edge_process_inbuf() found a conn in state natd_wait. See if
2091 * conn-\>inbuf has the right bytes to proceed. See FreeBSD's libalias(3) and
2092 * ProxyEncodeTcpStream() in src/lib/libalias/alias_proxy.c for the encoding
2093 * form of the original destination.
2095 * If the original destination is complete, send it to
2096 * connection_ap_handshake_rewrite_and_attach().
2098 * Return -1 if an unexpected error with conn (and it should be marked
2099 * for close), else return 0.
2102 connection_ap_process_natd(entry_connection_t
*conn
)
2104 char tmp_buf
[36], *tbuf
, *daddr
;
2107 socks_request_t
*socks
;
2110 tor_assert(ENTRY_TO_CONN(conn
)->state
== AP_CONN_STATE_NATD_WAIT
);
2111 tor_assert(conn
->socks_request
);
2112 socks
= conn
->socks_request
;
2114 log_debug(LD_APP
,"entered.");
2116 /* look for LF-terminated "[DEST ip_addr port]"
2117 * where ip_addr is a dotted-quad and port is in string form */
2118 err
= connection_fetch_from_buf_line(ENTRY_TO_CONN(conn
), tmp_buf
, &tlen
);
2122 log_warn(LD_APP
,"NATD handshake failed (DEST too long). Closing");
2123 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2127 if (strcmpstart(tmp_buf
, "[DEST ")) {
2128 log_warn(LD_APP
,"NATD handshake was ill-formed; closing. The client "
2131 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2135 daddr
= tbuf
= &tmp_buf
[0] + 6; /* after end of "[DEST " */
2136 if (!(tbuf
= strchr(tbuf
, ' '))) {
2137 log_warn(LD_APP
,"NATD handshake was ill-formed; closing. The client "
2140 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2145 /* pretend that a socks handshake completed so we don't try to
2146 * send a socks reply down a natd conn */
2147 strlcpy(socks
->address
, daddr
, sizeof(socks
->address
));
2148 socks
->port
= (uint16_t)
2149 tor_parse_long(tbuf
, 10, 1, 65535, &port_ok
, &daddr
);
2151 log_warn(LD_APP
,"NATD handshake failed; port %s is ill-formed or out "
2152 "of range.", escaped(tbuf
));
2153 connection_mark_unattached_ap(conn
, END_STREAM_REASON_INVALID_NATD_DEST
);
2157 socks
->command
= SOCKS_COMMAND_CONNECT
;
2158 socks
->has_finished
= 1;
2160 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2162 ENTRY_TO_CONN(conn
)->state
= AP_CONN_STATE_CIRCUIT_WAIT
;
2164 return connection_ap_rewrite_and_attach_if_allowed(conn
, NULL
, NULL
);
2167 /** Iterate over the two bytes of stream_id until we get one that is not
2168 * already in use; return it. Return 0 if can't get a unique stream_id.
2171 get_unique_stream_id_by_circ(origin_circuit_t
*circ
)
2173 edge_connection_t
*tmpconn
;
2174 streamid_t test_stream_id
;
2175 uint32_t attempts
=0;
2178 test_stream_id
= circ
->next_stream_id
++;
2179 if (++attempts
> 1<<16) {
2180 /* Make sure we don't loop forever if all stream_id's are used. */
2181 log_warn(LD_APP
,"No unused stream IDs. Failing.");
2184 if (test_stream_id
== 0)
2186 for (tmpconn
= circ
->p_streams
; tmpconn
; tmpconn
=tmpconn
->next_stream
)
2187 if (tmpconn
->stream_id
== test_stream_id
)
2189 return test_stream_id
;
2192 /** Return true iff <b>conn</b> is linked to a circuit and configured to use
2193 * an exit that supports optimistic data. */
2195 connection_ap_supports_optimistic_data(const entry_connection_t
*conn
)
2197 const edge_connection_t
*edge_conn
= ENTRY_TO_EDGE_CONN(conn
);
2198 /* We can only send optimistic data if we're connected to an open
2200 if (edge_conn
->on_circuit
== NULL
||
2201 edge_conn
->on_circuit
->state
!= CIRCUIT_STATE_OPEN
||
2202 (edge_conn
->on_circuit
->purpose
!= CIRCUIT_PURPOSE_C_GENERAL
&&
2203 edge_conn
->on_circuit
->purpose
!= CIRCUIT_PURPOSE_C_REND_JOINED
))
2206 return conn
->may_use_optimistic_data
;
2209 /** Return a bitmask of BEGIN_FLAG_* flags that we should transmit in the
2210 * RELAY_BEGIN cell for <b>ap_conn</b>. */
2212 connection_ap_get_begincell_flags(entry_connection_t
*ap_conn
)
2214 edge_connection_t
*edge_conn
= ENTRY_TO_EDGE_CONN(ap_conn
);
2215 const node_t
*exitnode
= NULL
;
2216 const crypt_path_t
*cpath_layer
= edge_conn
->cpath_layer
;
2219 /* No flags for begindir */
2220 if (ap_conn
->use_begindir
)
2223 /* No flags for hidden services. */
2224 if (edge_conn
->on_circuit
->purpose
!= CIRCUIT_PURPOSE_C_GENERAL
)
2227 /* If only IPv4 is supported, no flags */
2228 if (ap_conn
->entry_cfg
.ipv4_traffic
&& !ap_conn
->entry_cfg
.ipv6_traffic
)
2231 if (! cpath_layer
||
2232 ! cpath_layer
->extend_info
)
2235 if (!ap_conn
->entry_cfg
.ipv4_traffic
)
2236 flags
|= BEGIN_FLAG_IPV4_NOT_OK
;
2238 exitnode
= node_get_by_id(cpath_layer
->extend_info
->identity_digest
);
2240 if (ap_conn
->entry_cfg
.ipv6_traffic
&& exitnode
) {
2242 tor_addr_make_null(&a
, AF_INET6
);
2243 if (compare_tor_addr_to_node_policy(&a
, ap_conn
->socks_request
->port
,
2245 != ADDR_POLICY_REJECTED
) {
2246 /* Only say "IPv6 OK" if the exit node supports IPv6. Otherwise there's
2248 flags
|= BEGIN_FLAG_IPV6_OK
;
2252 if (flags
== BEGIN_FLAG_IPV6_OK
) {
2253 /* When IPv4 and IPv6 are both allowed, consider whether to say we
2254 * prefer IPv6. Otherwise there's no point in declaring a preference */
2255 if (ap_conn
->entry_cfg
.prefer_ipv6
)
2256 flags
|= BEGIN_FLAG_IPV6_PREFERRED
;
2259 if (flags
== BEGIN_FLAG_IPV4_NOT_OK
) {
2260 log_warn(LD_EDGE
, "I'm about to ask a node for a connection that I "
2261 "am telling it to fulfil with neither IPv4 nor IPv6. That's "
2262 "not going to work. Did you perhaps ask for an IPv6 address "
2263 "on an IPv4Only port, or vice versa?");
2269 /** Write a relay begin cell, using destaddr and destport from ap_conn's
2270 * socks_request field, and send it down circ.
2272 * If ap_conn is broken, mark it for close and return -1. Else return 0.
2275 connection_ap_handshake_send_begin(entry_connection_t
*ap_conn
)
2277 char payload
[CELL_PAYLOAD_SIZE
];
2280 origin_circuit_t
*circ
;
2281 edge_connection_t
*edge_conn
= ENTRY_TO_EDGE_CONN(ap_conn
);
2282 connection_t
*base_conn
= TO_CONN(edge_conn
);
2283 tor_assert(edge_conn
->on_circuit
);
2284 circ
= TO_ORIGIN_CIRCUIT(edge_conn
->on_circuit
);
2286 tor_assert(base_conn
->type
== CONN_TYPE_AP
);
2287 tor_assert(base_conn
->state
== AP_CONN_STATE_CIRCUIT_WAIT
);
2288 tor_assert(ap_conn
->socks_request
);
2289 tor_assert(SOCKS_COMMAND_IS_CONNECT(ap_conn
->socks_request
->command
));
2291 edge_conn
->stream_id
= get_unique_stream_id_by_circ(circ
);
2292 if (edge_conn
->stream_id
==0) {
2293 /* XXXX024 Instead of closing this stream, we should make it get
2294 * retried on another circuit. */
2295 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2297 /* Mark this circuit "unusable for new streams". */
2298 mark_circuit_unusable_for_new_conns(circ
);
2302 /* Set up begin cell flags. */
2303 edge_conn
->begincell_flags
= connection_ap_get_begincell_flags(ap_conn
);
2305 tor_snprintf(payload
,RELAY_PAYLOAD_SIZE
, "%s:%d",
2306 (circ
->base_
.purpose
== CIRCUIT_PURPOSE_C_GENERAL
) ?
2307 ap_conn
->socks_request
->address
: "",
2308 ap_conn
->socks_request
->port
);
2309 payload_len
= (int)strlen(payload
)+1;
2310 if (payload_len
<= RELAY_PAYLOAD_SIZE
- 4 && edge_conn
->begincell_flags
) {
2311 set_uint32(payload
+ payload_len
, htonl(edge_conn
->begincell_flags
));
2316 "Sending relay cell %d on circ %u to begin stream %d.",
2317 (int)ap_conn
->use_begindir
,
2318 (unsigned)circ
->base_
.n_circ_id
,
2319 edge_conn
->stream_id
);
2321 begin_type
= ap_conn
->use_begindir
?
2322 RELAY_COMMAND_BEGIN_DIR
: RELAY_COMMAND_BEGIN
;
2323 if (begin_type
== RELAY_COMMAND_BEGIN
) {
2324 #ifndef NON_ANONYMOUS_MODE_ENABLED
2325 tor_assert(circ
->build_state
->onehop_tunnel
== 0);
2329 if (connection_edge_send_command(edge_conn
, begin_type
,
2330 begin_type
== RELAY_COMMAND_BEGIN
? payload
: NULL
,
2331 begin_type
== RELAY_COMMAND_BEGIN
? payload_len
: 0) < 0)
2332 return -1; /* circuit is closed, don't continue */
2334 edge_conn
->package_window
= STREAMWINDOW_START
;
2335 edge_conn
->deliver_window
= STREAMWINDOW_START
;
2336 base_conn
->state
= AP_CONN_STATE_CONNECT_WAIT
;
2337 log_info(LD_APP
,"Address/port sent, ap socket "TOR_SOCKET_T_FORMAT
2339 base_conn
->s
, (unsigned)circ
->base_
.n_circ_id
);
2340 control_event_stream_status(ap_conn
, STREAM_EVENT_SENT_CONNECT
, 0);
2342 /* If there's queued-up data, send it now */
2343 if ((connection_get_inbuf_len(base_conn
) ||
2344 ap_conn
->sending_optimistic_data
) &&
2345 connection_ap_supports_optimistic_data(ap_conn
)) {
2346 log_info(LD_APP
, "Sending up to %ld + %ld bytes of queued-up data",
2347 (long)connection_get_inbuf_len(base_conn
),
2348 ap_conn
->sending_optimistic_data
?
2349 (long)generic_buffer_len(ap_conn
->sending_optimistic_data
) : 0);
2350 if (connection_edge_package_raw_inbuf(edge_conn
, 1, NULL
) < 0) {
2351 connection_mark_for_close(base_conn
);
2358 /** Write a relay resolve cell, using destaddr and destport from ap_conn's
2359 * socks_request field, and send it down circ.
2361 * If ap_conn is broken, mark it for close and return -1. Else return 0.
2364 connection_ap_handshake_send_resolve(entry_connection_t
*ap_conn
)
2366 int payload_len
, command
;
2367 const char *string_addr
;
2368 char inaddr_buf
[REVERSE_LOOKUP_NAME_BUF_LEN
];
2369 origin_circuit_t
*circ
;
2370 edge_connection_t
*edge_conn
= ENTRY_TO_EDGE_CONN(ap_conn
);
2371 connection_t
*base_conn
= TO_CONN(edge_conn
);
2372 tor_assert(edge_conn
->on_circuit
);
2373 circ
= TO_ORIGIN_CIRCUIT(edge_conn
->on_circuit
);
2375 tor_assert(base_conn
->type
== CONN_TYPE_AP
);
2376 tor_assert(base_conn
->state
== AP_CONN_STATE_CIRCUIT_WAIT
);
2377 tor_assert(ap_conn
->socks_request
);
2378 tor_assert(circ
->base_
.purpose
== CIRCUIT_PURPOSE_C_GENERAL
);
2380 command
= ap_conn
->socks_request
->command
;
2381 tor_assert(SOCKS_COMMAND_IS_RESOLVE(command
));
2383 edge_conn
->stream_id
= get_unique_stream_id_by_circ(circ
);
2384 if (edge_conn
->stream_id
==0) {
2385 /* XXXX024 Instead of closing this stream, we should make it get
2386 * retried on another circuit. */
2387 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2389 /* Mark this circuit "unusable for new streams". */
2390 mark_circuit_unusable_for_new_conns(circ
);
2394 if (command
== SOCKS_COMMAND_RESOLVE
) {
2395 string_addr
= ap_conn
->socks_request
->address
;
2396 payload_len
= (int)strlen(string_addr
)+1;
2398 /* command == SOCKS_COMMAND_RESOLVE_PTR */
2399 const char *a
= ap_conn
->socks_request
->address
;
2403 /* We're doing a reverse lookup. The input could be an IP address, or
2404 * could be an .in-addr.arpa or .ip6.arpa address */
2405 r
= tor_addr_parse_PTR_name(&addr
, a
, AF_UNSPEC
, 1);
2407 log_warn(LD_APP
, "Rejecting ill-formed reverse lookup of %s",
2408 safe_str_client(a
));
2409 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2413 r
= tor_addr_to_PTR_name(inaddr_buf
, sizeof(inaddr_buf
), &addr
);
2415 log_warn(LD_BUG
, "Couldn't generate reverse lookup hostname of %s",
2416 safe_str_client(a
));
2417 connection_mark_unattached_ap(ap_conn
, END_STREAM_REASON_INTERNAL
);
2421 string_addr
= inaddr_buf
;
2422 payload_len
= (int)strlen(inaddr_buf
)+1;
2423 tor_assert(payload_len
<= (int)sizeof(inaddr_buf
));
2427 "Sending relay cell to begin stream %d.", edge_conn
->stream_id
);
2429 if (connection_edge_send_command(edge_conn
,
2430 RELAY_COMMAND_RESOLVE
,
2431 string_addr
, payload_len
) < 0)
2432 return -1; /* circuit is closed, don't continue */
2434 if (!base_conn
->address
) {
2435 /* This might be unnecessary. XXXX */
2436 base_conn
->address
= tor_dup_addr(&base_conn
->addr
);
2438 base_conn
->state
= AP_CONN_STATE_RESOLVE_WAIT
;
2439 log_info(LD_APP
,"Address sent for resolve, ap socket "TOR_SOCKET_T_FORMAT
2441 base_conn
->s
, (unsigned)circ
->base_
.n_circ_id
);
2442 control_event_stream_status(ap_conn
, STREAM_EVENT_SENT_RESOLVE
, 0);
2446 /** Make an AP connection_t linked to the connection_t <b>partner</b>. make a
2447 * new linked connection pair, and attach one side to the conn, connection_add
2448 * it, initialize it to circuit_wait, and call
2449 * connection_ap_handshake_attach_circuit(conn) on it.
2451 * Return the newly created end of the linked connection pair, or -1 if error.
2453 entry_connection_t
*
2454 connection_ap_make_link(connection_t
*partner
,
2455 char *address
, uint16_t port
,
2457 int session_group
, int isolation_flags
,
2458 int use_begindir
, int want_onehop
)
2460 entry_connection_t
*conn
;
2461 connection_t
*base_conn
;
2463 log_info(LD_APP
,"Making internal %s tunnel to %s:%d ...",
2464 want_onehop
? "direct" : "anonymized",
2465 safe_str_client(address
), port
);
2467 conn
= entry_connection_new(CONN_TYPE_AP
, tor_addr_family(&partner
->addr
));
2468 base_conn
= ENTRY_TO_CONN(conn
);
2469 base_conn
->linked
= 1; /* so that we can add it safely below. */
2471 /* populate conn->socks_request */
2473 /* leave version at zero, so the socks_reply is empty */
2474 conn
->socks_request
->socks_version
= 0;
2475 conn
->socks_request
->has_finished
= 0; /* waiting for 'connected' */
2476 strlcpy(conn
->socks_request
->address
, address
,
2477 sizeof(conn
->socks_request
->address
));
2478 conn
->socks_request
->port
= port
;
2479 conn
->socks_request
->command
= SOCKS_COMMAND_CONNECT
;
2480 conn
->want_onehop
= want_onehop
;
2481 conn
->use_begindir
= use_begindir
;
2483 conn
->chosen_exit_name
= tor_malloc(HEX_DIGEST_LEN
+2);
2484 conn
->chosen_exit_name
[0] = '$';
2486 base16_encode(conn
->chosen_exit_name
+1,HEX_DIGEST_LEN
+1,
2487 digest
, DIGEST_LEN
);
2490 /* Populate isolation fields. */
2491 conn
->socks_request
->listener_type
= CONN_TYPE_DIR_LISTENER
;
2492 conn
->original_dest_address
= tor_strdup(address
);
2493 conn
->entry_cfg
.session_group
= session_group
;
2494 conn
->entry_cfg
.isolation_flags
= isolation_flags
;
2496 base_conn
->address
= tor_strdup("(Tor_internal)");
2497 tor_addr_make_unspec(&base_conn
->addr
);
2498 base_conn
->port
= 0;
2500 connection_link_connections(partner
, base_conn
);
2502 if (connection_add(base_conn
) < 0) { /* no space, forget it */
2503 connection_free(base_conn
);
2507 base_conn
->state
= AP_CONN_STATE_CIRCUIT_WAIT
;
2509 control_event_stream_status(conn
, STREAM_EVENT_NEW
, 0);
2511 /* attaching to a dirty circuit is fine */
2512 connection_ap_mark_as_pending_circuit(conn
);
2513 log_info(LD_APP
,"... application connection created and linked.");
2517 /** Notify any interested controller connections about a new hostname resolve
2518 * or resolve error. Takes the same arguments as does
2519 * connection_ap_handshake_socks_resolved(). */
2521 tell_controller_about_resolved_result(entry_connection_t
*conn
,
2528 expires
= time(NULL
) + ttl
;
2529 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
>= 4) {
2530 char *cp
= tor_dup_ip(ntohl(get_uint32(answer
)));
2531 control_event_address_mapped(conn
->socks_request
->address
,
2532 cp
, expires
, NULL
, 0);
2534 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
< 256) {
2535 char *cp
= tor_strndup(answer
, answer_len
);
2536 control_event_address_mapped(conn
->socks_request
->address
,
2537 cp
, expires
, NULL
, 0);
2540 control_event_address_mapped(conn
->socks_request
->address
,
2541 "<error>", time(NULL
)+ttl
,
2547 * As connection_ap_handshake_socks_resolved, but take a tor_addr_t to send
2551 connection_ap_handshake_socks_resolved_addr(entry_connection_t
*conn
,
2552 const tor_addr_t
*answer
,
2556 if (tor_addr_family(answer
) == AF_INET
) {
2557 uint32_t a
= tor_addr_to_ipv4n(answer
); /* network order */
2558 connection_ap_handshake_socks_resolved(conn
,RESOLVED_TYPE_IPV4
,4,
2561 } else if (tor_addr_family(answer
) == AF_INET6
) {
2562 const uint8_t *a
= tor_addr_to_in6_addr8(answer
);
2563 connection_ap_handshake_socks_resolved(conn
,RESOLVED_TYPE_IPV6
,16,
2567 log_warn(LD_BUG
, "Got called with address of unexpected family %d",
2568 tor_addr_family(answer
));
2569 connection_ap_handshake_socks_resolved(conn
,
2570 RESOLVED_TYPE_ERROR
,0,NULL
,-1,-1);
2574 /** Send an answer to an AP connection that has requested a DNS lookup via
2575 * SOCKS. The type should be one of RESOLVED_TYPE_(IPV4|IPV6|HOSTNAME) or -1
2576 * for unreachable; the answer should be in the format specified in the socks
2577 * extensions document. <b>ttl</b> is the ttl for the answer, or -1 on
2578 * certain errors or for values that didn't come via DNS. <b>expires</b> is
2579 * a time when the answer expires, or -1 or TIME_MAX if there's a good TTL.
2581 /* XXXX the use of the ttl and expires fields is nutty. Let's make this
2582 * interface and those that use it less ugly. */
2584 connection_ap_handshake_socks_resolved
,(entry_connection_t
*conn
,
2587 const uint8_t *answer
,
2595 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2597 tor_addr_from_ipv4n(&a
, get_uint32(answer
));
2598 if (! tor_addr_is_null(&a
)) {
2599 client_dns_set_addressmap(conn
,
2600 conn
->socks_request
->address
, &a
,
2601 conn
->chosen_exit_name
, ttl
);
2603 } else if (answer_type
== RESOLVED_TYPE_IPV6
&& answer_len
== 16) {
2605 tor_addr_from_ipv6_bytes(&a
, (char*)answer
);
2606 if (! tor_addr_is_null(&a
)) {
2607 client_dns_set_addressmap(conn
,
2608 conn
->socks_request
->address
, &a
,
2609 conn
->chosen_exit_name
, ttl
);
2611 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
< 256) {
2612 char *cp
= tor_strndup((char*)answer
, answer_len
);
2613 client_dns_set_reverse_addressmap(conn
,
2614 conn
->socks_request
->address
,
2616 conn
->chosen_exit_name
, ttl
);
2621 if (ENTRY_TO_EDGE_CONN(conn
)->is_dns_request
) {
2622 if (conn
->dns_server_request
) {
2623 /* We had a request on our DNS port: answer it. */
2624 dnsserv_resolved(conn
, answer_type
, answer_len
, (char*)answer
, ttl
);
2625 conn
->socks_request
->has_finished
= 1;
2628 /* This must be a request from the controller. Since answers to those
2629 * requests are not cached, they do not generate an ADDRMAP event on
2631 tell_controller_about_resolved_result(conn
, answer_type
, answer_len
,
2632 (char*)answer
, ttl
, expires
);
2633 conn
->socks_request
->has_finished
= 1;
2636 /* We shouldn't need to free conn here; it gets marked by the caller. */
2639 if (conn
->socks_request
->socks_version
== 4) {
2640 buf
[0] = 0x00; /* version */
2641 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2642 buf
[1] = SOCKS4_GRANTED
;
2643 set_uint16(buf
+2, 0);
2644 memcpy(buf
+4, answer
, 4); /* address */
2645 replylen
= SOCKS4_NETWORK_LEN
;
2646 } else { /* "error" */
2647 buf
[1] = SOCKS4_REJECT
;
2648 memset(buf
+2, 0, 6);
2649 replylen
= SOCKS4_NETWORK_LEN
;
2651 } else if (conn
->socks_request
->socks_version
== 5) {
2653 buf
[0] = 0x05; /* version */
2654 if (answer_type
== RESOLVED_TYPE_IPV4
&& answer_len
== 4) {
2655 buf
[1] = SOCKS5_SUCCEEDED
;
2656 buf
[2] = 0; /* reserved */
2657 buf
[3] = 0x01; /* IPv4 address type */
2658 memcpy(buf
+4, answer
, 4); /* address */
2659 set_uint16(buf
+8, 0); /* port == 0. */
2661 } else if (answer_type
== RESOLVED_TYPE_IPV6
&& answer_len
== 16) {
2662 buf
[1] = SOCKS5_SUCCEEDED
;
2663 buf
[2] = 0; /* reserved */
2664 buf
[3] = 0x04; /* IPv6 address type */
2665 memcpy(buf
+4, answer
, 16); /* address */
2666 set_uint16(buf
+20, 0); /* port == 0. */
2668 } else if (answer_type
== RESOLVED_TYPE_HOSTNAME
&& answer_len
< 256) {
2669 buf
[1] = SOCKS5_SUCCEEDED
;
2670 buf
[2] = 0; /* reserved */
2671 buf
[3] = 0x03; /* Domainname address type */
2672 buf
[4] = (char)answer_len
;
2673 memcpy(buf
+5, answer
, answer_len
); /* address */
2674 set_uint16(buf
+5+answer_len
, 0); /* port == 0. */
2675 replylen
= 5+answer_len
+2;
2677 buf
[1] = SOCKS5_HOST_UNREACHABLE
;
2678 memset(buf
+2, 0, 8);
2682 /* no socks version info; don't send anything back */
2685 connection_ap_handshake_socks_reply(conn
, buf
, replylen
,
2686 (answer_type
== RESOLVED_TYPE_IPV4
||
2687 answer_type
== RESOLVED_TYPE_IPV6
||
2688 answer_type
== RESOLVED_TYPE_HOSTNAME
) ?
2689 0 : END_STREAM_REASON_RESOLVEFAILED
);
2692 /** Send a socks reply to stream <b>conn</b>, using the appropriate
2693 * socks version, etc, and mark <b>conn</b> as completed with SOCKS
2696 * If <b>reply</b> is defined, then write <b>replylen</b> bytes of it to conn
2697 * and return, else reply based on <b>endreason</b> (one of
2698 * END_STREAM_REASON_*). If <b>reply</b> is undefined, <b>endreason</b> can't
2699 * be 0 or REASON_DONE. Send endreason to the controller, if appropriate.
2702 connection_ap_handshake_socks_reply(entry_connection_t
*conn
, char *reply
,
2703 size_t replylen
, int endreason
)
2706 socks5_reply_status_t status
=
2707 stream_end_reason_to_socks5_response(endreason
);
2709 tor_assert(conn
->socks_request
); /* make sure it's an AP stream */
2711 if (!SOCKS_COMMAND_IS_RESOLVE(conn
->socks_request
->command
)) {
2712 control_event_stream_status(conn
, status
==SOCKS5_SUCCEEDED
?
2713 STREAM_EVENT_SUCCEEDED
: STREAM_EVENT_FAILED
,
2717 /* Flag this stream's circuit as having completed a stream successfully
2718 * (for path bias) */
2719 if (status
== SOCKS5_SUCCEEDED
||
2720 endreason
== END_STREAM_REASON_RESOLVEFAILED
||
2721 endreason
== END_STREAM_REASON_CONNECTREFUSED
||
2722 endreason
== END_STREAM_REASON_CONNRESET
||
2723 endreason
== END_STREAM_REASON_NOROUTE
||
2724 endreason
== END_STREAM_REASON_RESOURCELIMIT
) {
2725 if (!conn
->edge_
.on_circuit
||
2726 !CIRCUIT_IS_ORIGIN(conn
->edge_
.on_circuit
)) {
2727 if (endreason
!= END_STREAM_REASON_RESOLVEFAILED
) {
2729 "No origin circuit for successful SOCKS stream "U64_FORMAT
2731 U64_PRINTF_ARG(ENTRY_TO_CONN(conn
)->global_identifier
),
2735 * Else DNS remaps and failed hidden service lookups can send us
2736 * here with END_STREAM_REASON_RESOLVEFAILED; ignore it
2738 * Perhaps we could make the test more precise; we can tell hidden
2739 * services by conn->edge_.renddata != NULL; anything analogous for
2740 * the DNS remap case?
2743 // XXX: Hrmm. It looks like optimistic data can't go through this
2744 // codepath, but someone should probably test it and make sure.
2745 // We don't want to mark optimistically opened streams as successful.
2746 pathbias_mark_use_success(TO_ORIGIN_CIRCUIT(conn
->edge_
.on_circuit
));
2750 if (conn
->socks_request
->has_finished
) {
2751 log_warn(LD_BUG
, "(Harmless.) duplicate calls to "
2752 "connection_ap_handshake_socks_reply.");
2755 if (replylen
) { /* we already have a reply in mind */
2756 connection_write_to_buf(reply
, replylen
, ENTRY_TO_CONN(conn
));
2757 conn
->socks_request
->has_finished
= 1;
2760 if (conn
->socks_request
->socks_version
== 4) {
2761 memset(buf
,0,SOCKS4_NETWORK_LEN
);
2762 buf
[1] = (status
==SOCKS5_SUCCEEDED
? SOCKS4_GRANTED
: SOCKS4_REJECT
);
2763 /* leave version, destport, destip zero */
2764 connection_write_to_buf(buf
, SOCKS4_NETWORK_LEN
, ENTRY_TO_CONN(conn
));
2765 } else if (conn
->socks_request
->socks_version
== 5) {
2767 memset(buf
,0,sizeof(buf
));
2768 if (tor_addr_family(&conn
->edge_
.base_
.addr
) == AF_INET
) {
2769 buf
[0] = 5; /* version 5 */
2770 buf
[1] = (char)status
;
2772 buf
[3] = 1; /* ipv4 addr */
2773 /* 4 bytes for the header, 2 bytes for the port, 4 for the address. */
2775 } else { /* AF_INET6. */
2776 buf
[0] = 5; /* version 5 */
2777 buf
[1] = (char)status
;
2779 buf
[3] = 4; /* ipv6 addr */
2780 /* 4 bytes for the header, 2 bytes for the port, 16 for the address. */
2783 connection_write_to_buf(buf
,buf_len
,ENTRY_TO_CONN(conn
));
2785 /* If socks_version isn't 4 or 5, don't send anything.
2786 * This can happen in the case of AP bridges. */
2787 conn
->socks_request
->has_finished
= 1;
2791 /** Read a RELAY_BEGIN or RELAY_BEGINDIR cell from <b>cell</b>, decode it, and
2792 * place the result in <b>bcell</b>. On success return 0; on failure return
2793 * <0 and set *<b>end_reason_out</b> to the end reason we should send back to
2796 * Return -1 in the case where want to send a RELAY_END cell, and < -1 when
2800 begin_cell_parse(const cell_t
*cell
, begin_cell_t
*bcell
,
2801 uint8_t *end_reason_out
)
2804 const uint8_t *body
, *nul
;
2806 memset(bcell
, 0, sizeof(*bcell
));
2807 *end_reason_out
= END_STREAM_REASON_MISC
;
2809 relay_header_unpack(&rh
, cell
->payload
);
2810 if (rh
.length
> RELAY_PAYLOAD_SIZE
) {
2811 return -2; /*XXXX why not TORPROTOCOL? */
2814 bcell
->stream_id
= rh
.stream_id
;
2816 if (rh
.command
== RELAY_COMMAND_BEGIN_DIR
) {
2817 bcell
->is_begindir
= 1;
2819 } else if (rh
.command
!= RELAY_COMMAND_BEGIN
) {
2820 log_warn(LD_BUG
, "Got an unexpected command %d", (int)rh
.command
);
2821 *end_reason_out
= END_STREAM_REASON_INTERNAL
;
2825 body
= cell
->payload
+ RELAY_HEADER_SIZE
;
2826 nul
= memchr(body
, 0, rh
.length
);
2828 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2829 "Relay begin cell has no \\0. Closing.");
2830 *end_reason_out
= END_STREAM_REASON_TORPROTOCOL
;
2834 if (tor_addr_port_split(LOG_PROTOCOL_WARN
,
2836 &bcell
->address
,&bcell
->port
)<0) {
2837 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2838 "Unable to parse addr:port in relay begin cell. Closing.");
2839 *end_reason_out
= END_STREAM_REASON_TORPROTOCOL
;
2842 if (bcell
->port
== 0) {
2843 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2844 "Missing port in relay begin cell. Closing.");
2845 tor_free(bcell
->address
);
2846 *end_reason_out
= END_STREAM_REASON_TORPROTOCOL
;
2849 if (body
+ rh
.length
>= nul
+ 4)
2850 bcell
->flags
= ntohl(get_uint32(nul
+1));
2855 /** A relay 'begin' or 'begin_dir' cell has arrived, and either we are
2856 * an exit hop for the circuit, or we are the origin and it is a
2859 * Launch a new exit connection and initialize things appropriately.
2861 * If it's a rendezvous stream, call connection_exit_connect() on
2864 * For general streams, call dns_resolve() on it first, and only call
2865 * connection_exit_connect() if the dns answer is already known.
2867 * Note that we don't call connection_add() on the new stream! We wait
2868 * for connection_exit_connect() to do that.
2870 * Return -(some circuit end reason) if we want to tear down <b>circ</b>.
2874 connection_exit_begin_conn(cell_t
*cell
, circuit_t
*circ
)
2876 edge_connection_t
*n_stream
;
2878 char *address
= NULL
;
2880 or_circuit_t
*or_circ
= NULL
;
2881 const or_options_t
*options
= get_options();
2884 uint8_t end_reason
=0;
2886 assert_circuit_ok(circ
);
2887 if (!CIRCUIT_IS_ORIGIN(circ
))
2888 or_circ
= TO_OR_CIRCUIT(circ
);
2890 relay_header_unpack(&rh
, cell
->payload
);
2891 if (rh
.length
> RELAY_PAYLOAD_SIZE
)
2892 return -END_CIRC_REASON_TORPROTOCOL
;
2894 /* Note: we have to use relay_send_command_from_edge here, not
2895 * connection_edge_end or connection_edge_send_command, since those require
2896 * that we have a stream connected to a circuit, and we don't connect to a
2897 * circuit until we have a pending/successful resolve. */
2899 if (!server_mode(options
) &&
2900 circ
->purpose
!= CIRCUIT_PURPOSE_S_REND_JOINED
) {
2901 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2902 "Relay begin cell at non-server. Closing.");
2903 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2904 END_STREAM_REASON_EXITPOLICY
, NULL
);
2908 r
= begin_cell_parse(cell
, &bcell
, &end_reason
);
2910 return -END_CIRC_REASON_TORPROTOCOL
;
2911 } else if (r
== -1) {
2912 tor_free(bcell
.address
);
2913 relay_send_end_cell_from_edge(rh
.stream_id
, circ
, end_reason
, NULL
);
2917 if (! bcell
.is_begindir
) {
2918 /* Steal reference */
2919 address
= bcell
.address
;
2922 if (or_circ
&& or_circ
->p_chan
) {
2923 if (!options
->AllowSingleHopExits
&&
2924 (or_circ
->is_first_hop
||
2925 (!connection_or_digest_is_known_relay(
2926 or_circ
->p_chan
->identity_digest
) &&
2927 should_refuse_unknown_exits(options
)))) {
2928 /* Don't let clients use us as a single-hop proxy, unless the user
2929 * has explicitly allowed that in the config. It attracts attackers
2930 * and users who'd be better off with, well, single-hop proxies.
2932 log_fn(LOG_PROTOCOL_WARN
, LD_PROTOCOL
,
2933 "Attempt by %s to open a stream %s. Closing.",
2934 safe_str(channel_get_canonical_remote_descr(or_circ
->p_chan
)),
2935 or_circ
->is_first_hop
? "on first hop of circuit" :
2936 "from unknown relay");
2937 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2938 or_circ
->is_first_hop
?
2939 END_STREAM_REASON_TORPROTOCOL
:
2940 END_STREAM_REASON_MISC
,
2946 } else if (rh
.command
== RELAY_COMMAND_BEGIN_DIR
) {
2947 if (!directory_permits_begindir_requests(options
) ||
2948 circ
->purpose
!= CIRCUIT_PURPOSE_OR
) {
2949 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2950 END_STREAM_REASON_NOTDIRECTORY
, NULL
);
2953 /* Make sure to get the 'real' address of the previous hop: the
2954 * caller might want to know whether the remote IP address has changed,
2955 * and we might already have corrected base_.addr[ess] for the relay's
2956 * canonical IP address. */
2957 if (or_circ
&& or_circ
->p_chan
)
2958 address
= tor_strdup(channel_get_actual_remote_address(or_circ
->p_chan
));
2960 address
= tor_strdup("127.0.0.1");
2961 port
= 1; /* XXXX This value is never actually used anywhere, and there
2962 * isn't "really" a connection here. But we
2963 * need to set it to something nonzero. */
2965 log_warn(LD_BUG
, "Got an unexpected command %d", (int)rh
.command
);
2966 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2967 END_STREAM_REASON_INTERNAL
, NULL
);
2971 if (! options
->IPv6Exit
) {
2972 /* I don't care if you prefer IPv6; I can't give you any. */
2973 bcell
.flags
&= ~BEGIN_FLAG_IPV6_PREFERRED
;
2974 /* If you don't want IPv4, I can't help. */
2975 if (bcell
.flags
& BEGIN_FLAG_IPV4_NOT_OK
) {
2977 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
2978 END_STREAM_REASON_EXITPOLICY
, NULL
);
2983 log_debug(LD_EXIT
,"Creating new exit connection.");
2984 /* The 'AF_INET' here is temporary; we might need to change it later in
2985 * connection_exit_connect(). */
2986 n_stream
= edge_connection_new(CONN_TYPE_EXIT
, AF_INET
);
2988 /* Remember the tunneled request ID in the new edge connection, so that
2989 * we can measure download times. */
2990 n_stream
->dirreq_id
= circ
->dirreq_id
;
2992 n_stream
->base_
.purpose
= EXIT_PURPOSE_CONNECT
;
2993 n_stream
->begincell_flags
= bcell
.flags
;
2994 n_stream
->stream_id
= rh
.stream_id
;
2995 n_stream
->base_
.port
= port
;
2996 /* leave n_stream->s at -1, because it's not yet valid */
2997 n_stream
->package_window
= STREAMWINDOW_START
;
2998 n_stream
->deliver_window
= STREAMWINDOW_START
;
3000 if (circ
->purpose
== CIRCUIT_PURPOSE_S_REND_JOINED
) {
3001 origin_circuit_t
*origin_circ
= TO_ORIGIN_CIRCUIT(circ
);
3002 log_info(LD_REND
,"begin is for rendezvous. configuring stream.");
3003 n_stream
->base_
.address
= tor_strdup("(rendezvous)");
3004 n_stream
->base_
.state
= EXIT_CONN_STATE_CONNECTING
;
3005 n_stream
->rend_data
= rend_data_dup(origin_circ
->rend_data
);
3006 tor_assert(connection_edge_is_rendezvous_stream(n_stream
));
3007 assert_circuit_ok(circ
);
3009 const int r
= rend_service_set_connection_addr_port(n_stream
, origin_circ
);
3011 log_info(LD_REND
,"Didn't find rendezvous service (port %d)",
3012 n_stream
->base_
.port
);
3013 /* Send back reason DONE because we want to make hidden service port
3014 * scanning harder thus instead of returning that the exit policy
3015 * didn't match, which makes it obvious that the port is closed,
3016 * return DONE and kill the circuit. That way, a user (malicious or
3017 * not) needs one circuit per bad port unless it matches the policy of
3018 * the hidden service. */
3019 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
3020 END_STREAM_REASON_DONE
,
3021 origin_circ
->cpath
->prev
);
3022 connection_free(TO_CONN(n_stream
));
3025 /* Drop the circuit here since it might be someone deliberately
3026 * scanning the hidden service ports. Note that this mitigates port
3027 * scanning by adding more work on the attacker side to successfully
3028 * scan but does not fully solve it. */
3030 return END_CIRC_AT_ORIGIN
;
3034 assert_circuit_ok(circ
);
3035 log_debug(LD_REND
,"Finished assigning addr/port");
3036 n_stream
->cpath_layer
= origin_circ
->cpath
->prev
; /* link it */
3038 /* add it into the linked list of p_streams on this circuit */
3039 n_stream
->next_stream
= origin_circ
->p_streams
;
3040 n_stream
->on_circuit
= circ
;
3041 origin_circ
->p_streams
= n_stream
;
3042 assert_circuit_ok(circ
);
3044 origin_circ
->rend_data
->nr_streams
++;
3046 connection_exit_connect(n_stream
);
3048 /* For path bias: This circuit was used successfully */
3049 pathbias_mark_use_success(origin_circ
);
3054 tor_strlower(address
);
3055 n_stream
->base_
.address
= address
;
3056 n_stream
->base_
.state
= EXIT_CONN_STATE_RESOLVEFAILED
;
3057 /* default to failed, change in dns_resolve if it turns out not to fail */
3059 if (we_are_hibernating()) {
3060 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
3061 END_STREAM_REASON_HIBERNATING
, NULL
);
3062 connection_free(TO_CONN(n_stream
));
3066 n_stream
->on_circuit
= circ
;
3068 if (rh
.command
== RELAY_COMMAND_BEGIN_DIR
) {
3069 tor_addr_t tmp_addr
;
3070 tor_assert(or_circ
);
3071 if (or_circ
->p_chan
&&
3072 channel_get_addr_if_possible(or_circ
->p_chan
, &tmp_addr
)) {
3073 tor_addr_copy(&n_stream
->base_
.addr
, &tmp_addr
);
3075 return connection_exit_connect_dir(n_stream
);
3078 log_debug(LD_EXIT
,"about to start the dns_resolve().");
3080 /* send it off to the gethostbyname farm */
3081 switch (dns_resolve(n_stream
)) {
3082 case 1: /* resolve worked; now n_stream is attached to circ. */
3083 assert_circuit_ok(circ
);
3084 log_debug(LD_EXIT
,"about to call connection_exit_connect().");
3085 connection_exit_connect(n_stream
);
3087 case -1: /* resolve failed */
3088 relay_send_end_cell_from_edge(rh
.stream_id
, circ
,
3089 END_STREAM_REASON_RESOLVEFAILED
, NULL
);
3090 /* n_stream got freed. don't touch it. */
3092 case 0: /* resolve added to pending list */
3093 assert_circuit_ok(circ
);
3100 * Called when we receive a RELAY_COMMAND_RESOLVE cell 'cell' along the
3101 * circuit <b>circ</b>;
3102 * begin resolving the hostname, and (eventually) reply with a RESOLVED cell.
3105 connection_exit_begin_resolve(cell_t
*cell
, or_circuit_t
*circ
)
3107 edge_connection_t
*dummy_conn
;
3110 assert_circuit_ok(TO_CIRCUIT(circ
));
3111 relay_header_unpack(&rh
, cell
->payload
);
3112 if (rh
.length
> RELAY_PAYLOAD_SIZE
)
3115 /* This 'dummy_conn' only exists to remember the stream ID
3116 * associated with the resolve request; and to make the
3117 * implementation of dns.c more uniform. (We really only need to
3118 * remember the circuit, the stream ID, and the hostname to be
3119 * resolved; but if we didn't store them in a connection like this,
3120 * the housekeeping in dns.c would get way more complicated.)
3122 dummy_conn
= edge_connection_new(CONN_TYPE_EXIT
, AF_INET
);
3123 dummy_conn
->stream_id
= rh
.stream_id
;
3124 dummy_conn
->base_
.address
= tor_strndup(
3125 (char*)cell
->payload
+RELAY_HEADER_SIZE
,
3127 dummy_conn
->base_
.port
= 0;
3128 dummy_conn
->base_
.state
= EXIT_CONN_STATE_RESOLVEFAILED
;
3129 dummy_conn
->base_
.purpose
= EXIT_PURPOSE_RESOLVE
;
3131 dummy_conn
->on_circuit
= TO_CIRCUIT(circ
);
3133 /* send it off to the gethostbyname farm */
3134 switch (dns_resolve(dummy_conn
)) {
3135 case -1: /* Impossible to resolve; a resolved cell was sent. */
3136 /* Connection freed; don't touch it. */
3138 case 1: /* The result was cached; a resolved cell was sent. */
3139 if (!dummy_conn
->base_
.marked_for_close
)
3140 connection_free(TO_CONN(dummy_conn
));
3142 case 0: /* resolve added to pending list */
3143 assert_circuit_ok(TO_CIRCUIT(circ
));
3149 /** Connect to conn's specified addr and port. If it worked, conn
3150 * has now been added to the connection_array.
3152 * Send back a connected cell. Include the resolved IP of the destination
3153 * address, but <em>only</em> if it's a general exit stream. (Rendezvous
3154 * streams must not reveal what IP they connected to.)
3157 connection_exit_connect(edge_connection_t
*edge_conn
)
3159 const tor_addr_t
*addr
;
3161 connection_t
*conn
= TO_CONN(edge_conn
);
3162 int socket_error
= 0, result
;
3164 if ( (!connection_edge_is_rendezvous_stream(edge_conn
) &&
3165 router_compare_to_my_exit_policy(&edge_conn
->base_
.addr
,
3166 edge_conn
->base_
.port
)) ||
3167 (tor_addr_family(&conn
->addr
) == AF_INET6
&&
3168 ! get_options()->IPv6Exit
)) {
3169 log_info(LD_EXIT
,"%s:%d failed exit policy. Closing.",
3170 escaped_safe_str_client(conn
->address
), conn
->port
);
3171 connection_edge_end(edge_conn
, END_STREAM_REASON_EXITPOLICY
);
3172 circuit_detach_stream(circuit_get_by_edge_conn(edge_conn
), edge_conn
);
3173 connection_free(conn
);
3177 #ifdef HAVE_SYS_UN_H
3178 if (conn
->socket_family
!= AF_UNIX
) {
3181 #endif /* defined(HAVE_SYS_UN_H) */
3185 if (tor_addr_family(addr
) == AF_INET6
)
3186 conn
->socket_family
= AF_INET6
;
3188 log_debug(LD_EXIT
, "about to try connecting");
3189 result
= connection_connect(conn
, conn
->address
,
3190 addr
, port
, &socket_error
);
3191 #ifdef HAVE_SYS_UN_H
3194 * In the AF_UNIX case, we expect to have already had conn->port = 1,
3195 * tor_addr_make_unspec(conn->addr) (cf. the way we mark in the incoming
3196 * case in connection_handle_listener_read()), and conn->address should
3197 * have the socket path to connect to.
3199 tor_assert(conn
->address
&& strlen(conn
->address
) > 0);
3201 log_debug(LD_EXIT
, "about to try connecting");
3202 result
= connection_connect_unix(conn
, conn
->address
, &socket_error
);
3203 #endif /* defined(HAVE_SYS_UN_H) */
3208 int reason
= errno_to_stream_end_reason(socket_error
);
3209 connection_edge_end(edge_conn
, reason
);
3210 circuit_detach_stream(circuit_get_by_edge_conn(edge_conn
), edge_conn
);
3211 connection_free(conn
);
3215 conn
->state
= EXIT_CONN_STATE_CONNECTING
;
3217 connection_watch_events(conn
, READ_EVENT
| WRITE_EVENT
);
3218 /* writable indicates finish;
3219 * readable/error indicates broken link in windows-land. */
3221 /* case 1: fall through */
3224 conn
->state
= EXIT_CONN_STATE_OPEN
;
3225 if (connection_get_outbuf_len(conn
)) {
3226 /* in case there are any queued data cells, from e.g. optimistic data */
3227 IF_HAS_NO_BUFFEREVENT(conn
)
3228 connection_watch_events(conn
, READ_EVENT
|WRITE_EVENT
);
3230 IF_HAS_NO_BUFFEREVENT(conn
)
3231 connection_watch_events(conn
, READ_EVENT
);
3234 /* also, deliver a 'connected' cell back through the circuit. */
3235 if (connection_edge_is_rendezvous_stream(edge_conn
)) {
3236 /* don't send an address back! */
3237 connection_edge_send_command(edge_conn
,
3238 RELAY_COMMAND_CONNECTED
,
3240 } else { /* normal stream */
3241 uint8_t connected_payload
[MAX_CONNECTED_CELL_PAYLOAD_LEN
];
3242 int connected_payload_len
=
3243 connected_cell_format_payload(connected_payload
, &conn
->addr
,
3244 edge_conn
->address_ttl
);
3245 if (connected_payload_len
< 0) {
3246 connection_edge_end(edge_conn
, END_STREAM_REASON_INTERNAL
);
3247 circuit_detach_stream(circuit_get_by_edge_conn(edge_conn
), edge_conn
);
3248 connection_free(conn
);
3252 connection_edge_send_command(edge_conn
,
3253 RELAY_COMMAND_CONNECTED
,
3254 (char*)connected_payload
,
3255 connected_payload_len
);
3259 /** Given an exit conn that should attach to us as a directory server, open a
3260 * bridge connection with a linked connection pair, create a new directory
3261 * conn, and join them together. Return 0 on success (or if there was an
3262 * error we could send back an end cell for). Return -(some circuit end
3263 * reason) if the circuit needs to be torn down. Either connects
3264 * <b>exitconn</b>, frees it, or marks it, as appropriate.
3267 connection_exit_connect_dir(edge_connection_t
*exitconn
)
3269 dir_connection_t
*dirconn
= NULL
;
3270 or_circuit_t
*circ
= TO_OR_CIRCUIT(exitconn
->on_circuit
);
3272 log_info(LD_EXIT
, "Opening local connection for anonymized directory exit");
3274 exitconn
->base_
.state
= EXIT_CONN_STATE_OPEN
;
3276 dirconn
= dir_connection_new(tor_addr_family(&exitconn
->base_
.addr
));
3278 tor_addr_copy(&dirconn
->base_
.addr
, &exitconn
->base_
.addr
);
3279 dirconn
->base_
.port
= 0;
3280 dirconn
->base_
.address
= tor_strdup(exitconn
->base_
.address
);
3281 dirconn
->base_
.type
= CONN_TYPE_DIR
;
3282 dirconn
->base_
.purpose
= DIR_PURPOSE_SERVER
;
3283 dirconn
->base_
.state
= DIR_CONN_STATE_SERVER_COMMAND_WAIT
;
3285 /* Note that the new dir conn belongs to the same tunneled request as
3286 * the edge conn, so that we can measure download times. */
3287 dirconn
->dirreq_id
= exitconn
->dirreq_id
;
3289 connection_link_connections(TO_CONN(dirconn
), TO_CONN(exitconn
));
3291 if (connection_add(TO_CONN(exitconn
))<0) {
3292 connection_edge_end(exitconn
, END_STREAM_REASON_RESOURCELIMIT
);
3293 connection_free(TO_CONN(exitconn
));
3294 connection_free(TO_CONN(dirconn
));
3298 /* link exitconn to circ, now that we know we can use it. */
3299 exitconn
->next_stream
= circ
->n_streams
;
3300 circ
->n_streams
= exitconn
;
3302 if (connection_add(TO_CONN(dirconn
))<0) {
3303 connection_edge_end(exitconn
, END_STREAM_REASON_RESOURCELIMIT
);
3304 connection_close_immediate(TO_CONN(exitconn
));
3305 connection_mark_for_close(TO_CONN(exitconn
));
3306 connection_free(TO_CONN(dirconn
));
3310 connection_start_reading(TO_CONN(dirconn
));
3311 connection_start_reading(TO_CONN(exitconn
));
3313 if (connection_edge_send_command(exitconn
,
3314 RELAY_COMMAND_CONNECTED
, NULL
, 0) < 0) {
3315 connection_mark_for_close(TO_CONN(exitconn
));
3316 connection_mark_for_close(TO_CONN(dirconn
));
3323 /** Return 1 if <b>conn</b> is a rendezvous stream, or 0 if
3324 * it is a general stream.
3327 connection_edge_is_rendezvous_stream(edge_connection_t
*conn
)
3330 if (conn
->rend_data
)
3335 /** Return 1 if router <b>exit</b> is likely to allow stream <b>conn</b>
3336 * to exit from it, or 0 if it probably will not allow it.
3337 * (We might be uncertain if conn's destination address has not yet been
3341 connection_ap_can_use_exit(const entry_connection_t
*conn
, const node_t
*exit
)
3343 const or_options_t
*options
= get_options();
3346 tor_assert(conn
->socks_request
);
3349 /* If a particular exit node has been requested for the new connection,
3350 * make sure the exit node of the existing circuit matches exactly.
3352 if (conn
->chosen_exit_name
) {
3353 const node_t
*chosen_exit
=
3354 node_get_by_nickname(conn
->chosen_exit_name
, 1);
3355 if (!chosen_exit
|| tor_memneq(chosen_exit
->identity
,
3356 exit
->identity
, DIGEST_LEN
)) {
3358 // log_debug(LD_APP,"Requested node '%s', considering node '%s'. No.",
3359 // conn->chosen_exit_name, exit->nickname);
3364 if (conn
->use_begindir
) {
3365 /* Internal directory fetches do not count as exiting. */
3369 if (conn
->socks_request
->command
== SOCKS_COMMAND_CONNECT
) {
3370 tor_addr_t addr
, *addrp
= NULL
;
3371 addr_policy_result_t r
;
3372 if (0 == tor_addr_parse(&addr
, conn
->socks_request
->address
)) {
3374 } else if (!conn
->entry_cfg
.ipv4_traffic
&& conn
->entry_cfg
.ipv6_traffic
) {
3375 tor_addr_make_null(&addr
, AF_INET6
);
3377 } else if (conn
->entry_cfg
.ipv4_traffic
&& !conn
->entry_cfg
.ipv6_traffic
) {
3378 tor_addr_make_null(&addr
, AF_INET
);
3381 r
= compare_tor_addr_to_node_policy(addrp
, conn
->socks_request
->port
,exit
);
3382 if (r
== ADDR_POLICY_REJECTED
)
3383 return 0; /* We know the address, and the exit policy rejects it. */
3384 if (r
== ADDR_POLICY_PROBABLY_REJECTED
&& !conn
->chosen_exit_name
)
3385 return 0; /* We don't know the addr, but the exit policy rejects most
3386 * addresses with this port. Since the user didn't ask for
3387 * this node, err on the side of caution. */
3388 } else if (SOCKS_COMMAND_IS_RESOLVE(conn
->socks_request
->command
)) {
3389 /* Don't send DNS requests to non-exit servers by default. */
3390 if (!conn
->chosen_exit_name
&& node_exit_policy_rejects_all(exit
))
3393 if (routerset_contains_node(options
->ExcludeExitNodesUnion_
, exit
)) {
3394 /* Not a suitable exit. Refuse it. */
3401 /** If address is of the form "y.onion" with a well-formed handle y:
3402 * Put a NUL after y, lower-case it, and return ONION_HOSTNAME.
3404 * If address is of the form "x.y.onion" with a well-formed handle x:
3405 * Drop "x.", put a NUL after y, lower-case it, and return ONION_HOSTNAME.
3407 * If address is of the form "y.onion" with a badly-formed handle y:
3408 * Return BAD_HOSTNAME and log a message.
3410 * If address is of the form "y.exit":
3411 * Put a NUL after y and return EXIT_HOSTNAME.
3414 * Return NORMAL_HOSTNAME and change nothing.
3417 parse_extended_hostname(char *address
)
3421 char query
[REND_SERVICE_ID_LEN_BASE32
+1];
3423 s
= strrchr(address
,'.');
3425 return NORMAL_HOSTNAME
; /* no dot, thus normal */
3426 if (!strcmp(s
+1,"exit")) {
3427 *s
= 0; /* NUL-terminate it */
3428 return EXIT_HOSTNAME
; /* .exit */
3430 if (strcmp(s
+1,"onion"))
3431 return NORMAL_HOSTNAME
; /* neither .exit nor .onion, thus normal */
3433 /* so it is .onion */
3434 *s
= 0; /* NUL-terminate it */
3435 /* locate a 'sub-domain' component, in order to remove it */
3436 q
= strrchr(address
, '.');
3438 goto failed
; /* reject sub-domain, as DNS does */
3440 q
= (NULL
== q
) ? address
: q
+ 1;
3441 if (strlcpy(query
, q
, REND_SERVICE_ID_LEN_BASE32
+1) >=
3442 REND_SERVICE_ID_LEN_BASE32
+1)
3445 memmove(address
, q
, strlen(q
) + 1 /* also get \0 */);
3447 if (rend_valid_service_id(query
)) {
3448 return ONION_HOSTNAME
; /* success */
3451 /* otherwise, return to previous state and return 0 */
3453 log_warn(LD_APP
, "Invalid onion hostname %s; rejecting",
3454 safe_str_client(address
));
3455 return BAD_HOSTNAME
;
3458 /** Return true iff the (possibly NULL) <b>alen</b>-byte chunk of memory at
3459 * <b>a</b> is equal to the (possibly NULL) <b>blen</b>-byte chunk of memory
3462 memeq_opt(const char *a
, size_t alen
, const char *b
, size_t blen
)
3466 } else if (b
== NULL
) {
3468 } else if (alen
!= blen
) {
3471 return tor_memeq(a
, b
, alen
);
3476 * Return true iff none of the isolation flags and fields in <b>conn</b>
3477 * should prevent it from being attached to <b>circ</b>.
3480 connection_edge_compatible_with_circuit(const entry_connection_t
*conn
,
3481 const origin_circuit_t
*circ
)
3483 const uint8_t iso
= conn
->entry_cfg
.isolation_flags
;
3484 const socks_request_t
*sr
= conn
->socks_request
;
3486 /* If circ has never been used for an isolated connection, we can
3487 * totally use it for this one. */
3488 if (!circ
->isolation_values_set
)
3491 /* If circ has been used for connections having more than one value
3492 * for some field f, it will have the corresponding bit set in
3493 * isolation_flags_mixed. If isolation_flags_mixed has any bits
3494 * in common with iso, then conn must be isolated from at least
3495 * one stream that has been attached to circ. */
3496 if ((iso
& circ
->isolation_flags_mixed
) != 0) {
3497 /* For at least one field where conn is isolated, the circuit
3498 * already has mixed streams. */
3502 if (! conn
->original_dest_address
) {
3503 log_warn(LD_BUG
, "Reached connection_edge_compatible_with_circuit without "
3504 "having set conn->original_dest_address");
3505 ((entry_connection_t
*)conn
)->original_dest_address
=
3506 tor_strdup(conn
->socks_request
->address
);
3509 if ((iso
& ISO_STREAM
) &&
3510 (circ
->associated_isolated_stream_global_id
!=
3511 ENTRY_TO_CONN(conn
)->global_identifier
))
3514 if ((iso
& ISO_DESTPORT
) && conn
->socks_request
->port
!= circ
->dest_port
)
3516 if ((iso
& ISO_DESTADDR
) &&
3517 strcasecmp(conn
->original_dest_address
, circ
->dest_address
))
3519 if ((iso
& ISO_SOCKSAUTH
) &&
3520 (! memeq_opt(sr
->username
, sr
->usernamelen
,
3521 circ
->socks_username
, circ
->socks_username_len
) ||
3522 ! memeq_opt(sr
->password
, sr
->passwordlen
,
3523 circ
->socks_password
, circ
->socks_password_len
)))
3525 if ((iso
& ISO_CLIENTPROTO
) &&
3526 (conn
->socks_request
->listener_type
!= circ
->client_proto_type
||
3527 conn
->socks_request
->socks_version
!= circ
->client_proto_socksver
))
3529 if ((iso
& ISO_CLIENTADDR
) &&
3530 !tor_addr_eq(&ENTRY_TO_CONN(conn
)->addr
, &circ
->client_addr
))
3532 if ((iso
& ISO_SESSIONGRP
) &&
3533 conn
->entry_cfg
.session_group
!= circ
->session_group
)
3535 if ((iso
& ISO_NYM_EPOCH
) && conn
->nym_epoch
!= circ
->nym_epoch
)
3542 * If <b>dry_run</b> is false, update <b>circ</b>'s isolation flags and fields
3543 * to reflect having had <b>conn</b> attached to it, and return 0. Otherwise,
3544 * if <b>dry_run</b> is true, then make no changes to <b>circ</b>, and return
3545 * a bitfield of isolation flags that we would have to set in
3546 * isolation_flags_mixed to add <b>conn</b> to <b>circ</b>, or -1 if
3547 * <b>circ</b> has had no streams attached to it.
3550 connection_edge_update_circuit_isolation(const entry_connection_t
*conn
,
3551 origin_circuit_t
*circ
,
3554 const socks_request_t
*sr
= conn
->socks_request
;
3555 if (! conn
->original_dest_address
) {
3556 log_warn(LD_BUG
, "Reached connection_update_circuit_isolation without "
3557 "having set conn->original_dest_address");
3558 ((entry_connection_t
*)conn
)->original_dest_address
=
3559 tor_strdup(conn
->socks_request
->address
);
3562 if (!circ
->isolation_values_set
) {
3565 circ
->associated_isolated_stream_global_id
=
3566 ENTRY_TO_CONN(conn
)->global_identifier
;
3567 circ
->dest_port
= conn
->socks_request
->port
;
3568 circ
->dest_address
= tor_strdup(conn
->original_dest_address
);
3569 circ
->client_proto_type
= conn
->socks_request
->listener_type
;
3570 circ
->client_proto_socksver
= conn
->socks_request
->socks_version
;
3571 tor_addr_copy(&circ
->client_addr
, &ENTRY_TO_CONN(conn
)->addr
);
3572 circ
->session_group
= conn
->entry_cfg
.session_group
;
3573 circ
->nym_epoch
= conn
->nym_epoch
;
3574 circ
->socks_username
= sr
->username
?
3575 tor_memdup(sr
->username
, sr
->usernamelen
) : NULL
;
3576 circ
->socks_password
= sr
->password
?
3577 tor_memdup(sr
->password
, sr
->passwordlen
) : NULL
;
3578 circ
->socks_username_len
= sr
->usernamelen
;
3579 circ
->socks_password_len
= sr
->passwordlen
;
3581 circ
->isolation_values_set
= 1;
3585 if (conn
->socks_request
->port
!= circ
->dest_port
)
3586 mixed
|= ISO_DESTPORT
;
3587 if (strcasecmp(conn
->original_dest_address
, circ
->dest_address
))
3588 mixed
|= ISO_DESTADDR
;
3589 if (!memeq_opt(sr
->username
, sr
->usernamelen
,
3590 circ
->socks_username
, circ
->socks_username_len
) ||
3591 !memeq_opt(sr
->password
, sr
->passwordlen
,
3592 circ
->socks_password
, circ
->socks_password_len
))
3593 mixed
|= ISO_SOCKSAUTH
;
3594 if ((conn
->socks_request
->listener_type
!= circ
->client_proto_type
||
3595 conn
->socks_request
->socks_version
!= circ
->client_proto_socksver
))
3596 mixed
|= ISO_CLIENTPROTO
;
3597 if (!tor_addr_eq(&ENTRY_TO_CONN(conn
)->addr
, &circ
->client_addr
))
3598 mixed
|= ISO_CLIENTADDR
;
3599 if (conn
->entry_cfg
.session_group
!= circ
->session_group
)
3600 mixed
|= ISO_SESSIONGRP
;
3601 if (conn
->nym_epoch
!= circ
->nym_epoch
)
3602 mixed
|= ISO_NYM_EPOCH
;
3607 if ((mixed
& conn
->entry_cfg
.isolation_flags
) != 0) {
3608 log_warn(LD_BUG
, "Updating a circuit with seemingly incompatible "
3609 "isolation flags.");
3611 circ
->isolation_flags_mixed
|= mixed
;
3617 * Clear the isolation settings on <b>circ</b>.
3619 * This only works on an open circuit that has never had a stream attached to
3620 * it, and whose isolation settings are hypothetical. (We set hypothetical
3621 * isolation settings on circuits as we're launching them, so that we
3622 * know whether they can handle more streams or whether we need to launch
3623 * even more circuits. Once the circuit is open, if it turns out that
3624 * we no longer have any streams to attach to it, we clear the isolation flags
3625 * and data so that other streams can have a chance.)
3628 circuit_clear_isolation(origin_circuit_t
*circ
)
3630 if (circ
->isolation_any_streams_attached
) {
3631 log_warn(LD_BUG
, "Tried to clear the isolation status of a dirty circuit");
3634 if (TO_CIRCUIT(circ
)->state
!= CIRCUIT_STATE_OPEN
) {
3635 log_warn(LD_BUG
, "Tried to clear the isolation status of a non-open "
3640 circ
->isolation_values_set
= 0;
3641 circ
->isolation_flags_mixed
= 0;
3642 circ
->associated_isolated_stream_global_id
= 0;
3643 circ
->client_proto_type
= 0;
3644 circ
->client_proto_socksver
= 0;
3645 circ
->dest_port
= 0;
3646 tor_addr_make_unspec(&circ
->client_addr
);
3647 tor_free(circ
->dest_address
);
3648 circ
->session_group
= -1;
3649 circ
->nym_epoch
= 0;
3650 if (circ
->socks_username
) {
3651 memwipe(circ
->socks_username
, 0x11, circ
->socks_username_len
);
3652 tor_free(circ
->socks_username
);
3654 if (circ
->socks_password
) {
3655 memwipe(circ
->socks_password
, 0x05, circ
->socks_password_len
);
3656 tor_free(circ
->socks_password
);
3658 circ
->socks_username_len
= circ
->socks_password_len
= 0;
3661 /** Free all storage held in module-scoped variables for connection_edge.c */
3663 connection_edge_free_all(void)
3665 untried_pending_connections
= 0;
3666 smartlist_free(pending_entry_connections
);
3667 pending_entry_connections
= NULL
;