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) 2007-2019, The Tor Project, Inc. */
5 /* See LICENSE for licensing information */
9 * \brief General high-level functions to handle reading and writing
12 * Each connection (ideally) represents a TLS connection, a TCP socket, a unix
13 * socket, or a UDP socket on which reads and writes can occur. (But see
14 * connection_edge.c for cases where connections can also represent streams
15 * that do not have a corresponding socket.)
17 * The module implements the abstract type, connection_t. The subtypes are:
19 * <li>listener_connection_t, implemented here in connection.c
20 * <li>dir_connection_t, implemented in directory.c
21 * <li>or_connection_t, implemented in connection_or.c
22 * <li>edge_connection_t, implemented in connection_edge.c, along with
24 * <ul><li>entry_connection_t, also implemented in connection_edge.c
26 * <li>control_connection_t, implemented in control.c
29 * The base type implemented in this module is responsible for basic
30 * rate limiting, flow control, and marshalling bytes onto and off of the
31 * network (either directly or via TLS).
33 * Connections are registered with the main loop with connection_add(). As
34 * they become able to read or write register the fact with the event main
35 * loop by calling connection_watch_events(), connection_start_reading(), or
36 * connection_start_writing(). When they no longer want to read or write,
37 * they call connection_stop_reading() or connection_stop_writing().
39 * To queue data to be written on a connection, call
40 * connection_buf_add(). When data arrives, the
41 * connection_process_inbuf() callback is invoked, which dispatches to a
42 * type-specific function (such as connection_edge_process_inbuf() for
43 * example). Connection types that need notice of when data has been written
44 * receive notification via connection_flushed_some() and
45 * connection_finished_flushing(). These functions all delegate to
46 * type-specific implementations.
48 * Additionally, beyond the core of connection_t, this module also implements:
50 * <li>Listeners, which wait for incoming sockets and launch connections
51 * <li>Outgoing SOCKS proxy support
52 * <li>Outgoing HTTP proxy support
53 * <li>An out-of-sockets handler for dealing with socket exhaustion
57 #define CONNECTION_PRIVATE
58 #include "core/or/or.h"
59 #include "feature/client/bridges.h"
60 #include "lib/buf/buffers.h"
61 #include "lib/tls/buffers_tls.h"
62 #include "lib/err/backtrace.h"
65 * Define this so we get channel internal functions, since we're implementing
66 * part of a subclass (channel_tls_t).
68 #define TOR_CHANNEL_INTERNAL_
69 #define CONNECTION_PRIVATE
70 #include "app/config/config.h"
71 #include "core/mainloop/connection.h"
72 #include "core/mainloop/mainloop.h"
73 #include "core/mainloop/netstatus.h"
74 #include "core/or/channel.h"
75 #include "core/or/channeltls.h"
76 #include "core/or/circuitbuild.h"
77 #include "core/or/circuitlist.h"
78 #include "core/or/circuituse.h"
79 #include "core/or/connection_edge.h"
80 #include "core/or/connection_or.h"
81 #include "core/or/dos.h"
82 #include "core/or/policies.h"
83 #include "core/or/reasons.h"
84 #include "core/or/relay.h"
85 #include "core/proto/proto_http.h"
86 #include "core/proto/proto_socks.h"
87 #include "feature/client/dnsserv.h"
88 #include "feature/client/entrynodes.h"
89 #include "feature/client/transports.h"
90 #include "feature/control/control.h"
91 #include "feature/dirauth/authmode.h"
92 #include "feature/dircache/dirserv.h"
93 #include "feature/dircommon/directory.h"
94 #include "feature/hibernate/hibernate.h"
95 #include "feature/hs/hs_common.h"
96 #include "feature/hs/hs_ident.h"
97 #include "feature/nodelist/nodelist.h"
98 #include "feature/nodelist/routerlist.h"
99 #include "feature/relay/dns.h"
100 #include "feature/relay/ext_orport.h"
101 #include "feature/relay/routermode.h"
102 #include "feature/rend/rendclient.h"
103 #include "feature/rend/rendcommon.h"
104 #include "feature/stats/rephist.h"
105 #include "lib/crypt_ops/crypto_util.h"
106 #include "lib/geoip/geoip.h"
108 #include "lib/sandbox/sandbox.h"
109 #include "lib/net/buffers_net.h"
110 #include "lib/tls/tortls.h"
111 #include "lib/evloop/compat_libevent.h"
112 #include "lib/compress/compress.h"
121 #ifdef HAVE_SYS_STAT_H
122 #include <sys/stat.h>
126 #include <sys/socket.h>
130 #include "feature/dircommon/dir_connection_st.h"
131 #include "feature/control/control_connection_st.h"
132 #include "core/or/entry_connection_st.h"
133 #include "core/or/listener_connection_st.h"
134 #include "core/or/or_connection_st.h"
135 #include "core/or/port_cfg_st.h"
136 #include "feature/nodelist/routerinfo_st.h"
137 #include "core/or/socks_request_st.h"
140 * On Windows and Linux we cannot reliably bind() a socket to an
141 * address and port if: 1) There's already a socket bound to wildcard
142 * address (0.0.0.0 or ::) with the same port; 2) We try to bind()
143 * to wildcard address and there's another socket bound to a
144 * specific address and the same port.
146 * To address this problem on these two platforms we implement a
148 * 1) Checks if first attempt to bind() a new socket failed with
150 * 2) If so, it will close the appropriate old listener connection and
151 * 3) Attempts bind()'ing the new listener socket again.
153 * Just to be safe, we are enabling listener rebind code on all platforms,
154 * to account for unexpected cases where it may be needed.
156 #define ENABLE_LISTENER_REBIND
158 static connection_t
*connection_listener_new(
159 const struct sockaddr
*listensockaddr
,
160 socklen_t listensocklen
, int type
,
162 const port_cfg_t
*portcfg
,
164 static connection_t
*connection_listener_new_for_port(
165 const port_cfg_t
*port
,
166 int *defer
, int *addr_in_use
);
167 static void connection_init(time_t now
, connection_t
*conn
, int type
,
169 static int connection_handle_listener_read(connection_t
*conn
, int new_type
);
170 static int connection_finished_flushing(connection_t
*conn
);
171 static int connection_flushed_some(connection_t
*conn
);
172 static int connection_finished_connecting(connection_t
*conn
);
173 static int connection_reached_eof(connection_t
*conn
);
174 static int connection_buf_read_from_socket(connection_t
*conn
,
175 ssize_t
*max_to_read
,
177 static int connection_process_inbuf(connection_t
*conn
, int package_partial
);
178 static void client_check_address_changed(tor_socket_t sock
);
179 static void set_constrained_socket_buffers(tor_socket_t sock
, int size
);
181 static const char *connection_proxy_state_to_string(int state
);
182 static int connection_read_https_proxy_response(connection_t
*conn
);
183 static void connection_send_socks5_connect(connection_t
*conn
);
184 static const char *proxy_type_to_string(int proxy_type
);
185 static int get_proxy_type(void);
186 const tor_addr_t
*conn_get_outbound_address(sa_family_t family
,
187 const or_options_t
*options
, unsigned int conn_type
);
188 static void reenable_blocked_connection_init(const or_options_t
*options
);
189 static void reenable_blocked_connection_schedule(void);
191 /** The last addresses that our network interface seemed to have been
192 * binding to. We use this as one way to detect when our IP changes.
194 * XXXX+ We should really use the entire list of interfaces here.
196 static tor_addr_t
*last_interface_ipv4
= NULL
;
197 /* DOCDOC last_interface_ipv6 */
198 static tor_addr_t
*last_interface_ipv6
= NULL
;
199 /** A list of tor_addr_t for addresses we've used in outgoing connections.
200 * Used to detect IP address changes. */
201 static smartlist_t
*outgoing_addrs
= NULL
;
203 #define CASE_ANY_LISTENER_TYPE \
204 case CONN_TYPE_OR_LISTENER: \
205 case CONN_TYPE_EXT_OR_LISTENER: \
206 case CONN_TYPE_AP_LISTENER: \
207 case CONN_TYPE_DIR_LISTENER: \
208 case CONN_TYPE_CONTROL_LISTENER: \
209 case CONN_TYPE_AP_TRANS_LISTENER: \
210 case CONN_TYPE_AP_NATD_LISTENER: \
211 case CONN_TYPE_AP_DNS_LISTENER: \
212 case CONN_TYPE_AP_HTTP_CONNECT_LISTENER
214 /**************************************************************/
216 /** Convert a connection_t* to an listener_connection_t*; assert if the cast
218 listener_connection_t
*
219 TO_LISTENER_CONN(connection_t
*c
)
221 tor_assert(c
->magic
== LISTENER_CONNECTION_MAGIC
);
222 return DOWNCAST(listener_connection_t
, c
);
226 connection_get_inbuf_len(connection_t
*conn
)
228 return conn
->inbuf
? buf_datalen(conn
->inbuf
) : 0;
232 connection_get_outbuf_len(connection_t
*conn
)
234 return conn
->outbuf
? buf_datalen(conn
->outbuf
) : 0;
238 * Return the human-readable name for the connection type <b>type</b>
241 conn_type_to_string(int type
)
245 case CONN_TYPE_OR_LISTENER
: return "OR listener";
246 case CONN_TYPE_OR
: return "OR";
247 case CONN_TYPE_EXIT
: return "Exit";
248 case CONN_TYPE_AP_LISTENER
: return "Socks listener";
249 case CONN_TYPE_AP_TRANS_LISTENER
:
250 return "Transparent pf/netfilter listener";
251 case CONN_TYPE_AP_NATD_LISTENER
: return "Transparent natd listener";
252 case CONN_TYPE_AP_DNS_LISTENER
: return "DNS listener";
253 case CONN_TYPE_AP
: return "Socks";
254 case CONN_TYPE_DIR_LISTENER
: return "Directory listener";
255 case CONN_TYPE_DIR
: return "Directory";
256 case CONN_TYPE_CONTROL_LISTENER
: return "Control listener";
257 case CONN_TYPE_CONTROL
: return "Control";
258 case CONN_TYPE_EXT_OR
: return "Extended OR";
259 case CONN_TYPE_EXT_OR_LISTENER
: return "Extended OR listener";
260 case CONN_TYPE_AP_HTTP_CONNECT_LISTENER
: return "HTTP tunnel listener";
262 log_warn(LD_BUG
, "unknown connection type %d", type
);
263 tor_snprintf(buf
, sizeof(buf
), "unknown [%d]", type
);
269 * Return the human-readable name for the connection state <b>state</b>
270 * for the connection type <b>type</b>
273 conn_state_to_string(int type
, int state
)
277 CASE_ANY_LISTENER_TYPE
:
278 if (state
== LISTENER_STATE_READY
)
283 case OR_CONN_STATE_CONNECTING
: return "connect()ing";
284 case OR_CONN_STATE_PROXY_HANDSHAKING
: return "handshaking (proxy)";
285 case OR_CONN_STATE_TLS_HANDSHAKING
: return "handshaking (TLS)";
286 case OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING
:
287 return "renegotiating (TLS, v2 handshake)";
288 case OR_CONN_STATE_TLS_SERVER_RENEGOTIATING
:
289 return "waiting for renegotiation or V3 handshake";
290 case OR_CONN_STATE_OR_HANDSHAKING_V2
:
291 return "handshaking (Tor, v2 handshake)";
292 case OR_CONN_STATE_OR_HANDSHAKING_V3
:
293 return "handshaking (Tor, v3 handshake)";
294 case OR_CONN_STATE_OPEN
: return "open";
297 case CONN_TYPE_EXT_OR
:
299 case EXT_OR_CONN_STATE_AUTH_WAIT_AUTH_TYPE
:
300 return "waiting for authentication type";
301 case EXT_OR_CONN_STATE_AUTH_WAIT_CLIENT_NONCE
:
302 return "waiting for client nonce";
303 case EXT_OR_CONN_STATE_AUTH_WAIT_CLIENT_HASH
:
304 return "waiting for client hash";
305 case EXT_OR_CONN_STATE_OPEN
: return "open";
306 case EXT_OR_CONN_STATE_FLUSHING
: return "flushing final OKAY";
311 case EXIT_CONN_STATE_RESOLVING
: return "waiting for dest info";
312 case EXIT_CONN_STATE_CONNECTING
: return "connecting";
313 case EXIT_CONN_STATE_OPEN
: return "open";
314 case EXIT_CONN_STATE_RESOLVEFAILED
: return "resolve failed";
319 case AP_CONN_STATE_SOCKS_WAIT
: return "waiting for socks info";
320 case AP_CONN_STATE_NATD_WAIT
: return "waiting for natd dest info";
321 case AP_CONN_STATE_RENDDESC_WAIT
: return "waiting for rendezvous desc";
322 case AP_CONN_STATE_CONTROLLER_WAIT
: return "waiting for controller";
323 case AP_CONN_STATE_CIRCUIT_WAIT
: return "waiting for circuit";
324 case AP_CONN_STATE_CONNECT_WAIT
: return "waiting for connect response";
325 case AP_CONN_STATE_RESOLVE_WAIT
: return "waiting for resolve response";
326 case AP_CONN_STATE_OPEN
: return "open";
331 case DIR_CONN_STATE_CONNECTING
: return "connecting";
332 case DIR_CONN_STATE_CLIENT_SENDING
: return "client sending";
333 case DIR_CONN_STATE_CLIENT_READING
: return "client reading";
334 case DIR_CONN_STATE_CLIENT_FINISHED
: return "client finished";
335 case DIR_CONN_STATE_SERVER_COMMAND_WAIT
: return "waiting for command";
336 case DIR_CONN_STATE_SERVER_WRITING
: return "writing";
339 case CONN_TYPE_CONTROL
:
341 case CONTROL_CONN_STATE_OPEN
: return "open (protocol v1)";
342 case CONTROL_CONN_STATE_NEEDAUTH
:
343 return "waiting for authentication (protocol v1)";
348 log_warn(LD_BUG
, "unknown connection state %d (type %d)", state
, type
);
349 tor_snprintf(buf
, sizeof(buf
),
350 "unknown state [%d] on unknown [%s] connection",
351 state
, conn_type_to_string(type
));
355 /** Allocate and return a new dir_connection_t, initialized as by
356 * connection_init(). */
358 dir_connection_new(int socket_family
)
360 dir_connection_t
*dir_conn
= tor_malloc_zero(sizeof(dir_connection_t
));
361 connection_init(time(NULL
), TO_CONN(dir_conn
), CONN_TYPE_DIR
, socket_family
);
365 /** Allocate and return a new or_connection_t, initialized as by
368 * Initialize active_circuit_pqueue.
370 * Set active_circuit_pqueue_last_recalibrated to current cell_ewma tick.
373 or_connection_new(int type
, int socket_family
)
375 or_connection_t
*or_conn
= tor_malloc_zero(sizeof(or_connection_t
));
376 time_t now
= time(NULL
);
377 tor_assert(type
== CONN_TYPE_OR
|| type
== CONN_TYPE_EXT_OR
);
378 connection_init(now
, TO_CONN(or_conn
), type
, socket_family
);
380 connection_or_set_canonical(or_conn
, 0);
382 if (type
== CONN_TYPE_EXT_OR
)
383 connection_or_set_ext_or_identifier(or_conn
);
388 /** Allocate and return a new entry_connection_t, initialized as by
391 * Allocate space to store the socks_request.
394 entry_connection_new(int type
, int socket_family
)
396 entry_connection_t
*entry_conn
= tor_malloc_zero(sizeof(entry_connection_t
));
397 tor_assert(type
== CONN_TYPE_AP
);
398 connection_init(time(NULL
), ENTRY_TO_CONN(entry_conn
), type
, socket_family
);
399 entry_conn
->socks_request
= socks_request_new();
400 /* If this is coming from a listener, we'll set it up based on the listener
401 * in a little while. Otherwise, we're doing this as a linked connection
402 * of some kind, and we should set it up here based on the socket family */
403 if (socket_family
== AF_INET
)
404 entry_conn
->entry_cfg
.ipv4_traffic
= 1;
405 else if (socket_family
== AF_INET6
)
406 entry_conn
->entry_cfg
.ipv6_traffic
= 1;
410 /** Allocate and return a new edge_connection_t, initialized as by
411 * connection_init(). */
413 edge_connection_new(int type
, int socket_family
)
415 edge_connection_t
*edge_conn
= tor_malloc_zero(sizeof(edge_connection_t
));
416 tor_assert(type
== CONN_TYPE_EXIT
);
417 connection_init(time(NULL
), TO_CONN(edge_conn
), type
, socket_family
);
421 /** Allocate and return a new control_connection_t, initialized as by
422 * connection_init(). */
423 control_connection_t
*
424 control_connection_new(int socket_family
)
426 control_connection_t
*control_conn
=
427 tor_malloc_zero(sizeof(control_connection_t
));
428 connection_init(time(NULL
),
429 TO_CONN(control_conn
), CONN_TYPE_CONTROL
, socket_family
);
433 /** Allocate and return a new listener_connection_t, initialized as by
434 * connection_init(). */
435 listener_connection_t
*
436 listener_connection_new(int type
, int socket_family
)
438 listener_connection_t
*listener_conn
=
439 tor_malloc_zero(sizeof(listener_connection_t
));
440 connection_init(time(NULL
), TO_CONN(listener_conn
), type
, socket_family
);
441 return listener_conn
;
444 /** Allocate, initialize, and return a new connection_t subtype of <b>type</b>
445 * to make or receive connections of address family <b>socket_family</b>. The
446 * type should be one of the CONN_TYPE_* constants. */
448 connection_new(int type
, int socket_family
)
452 case CONN_TYPE_EXT_OR
:
453 return TO_CONN(or_connection_new(type
, socket_family
));
456 return TO_CONN(edge_connection_new(type
, socket_family
));
459 return ENTRY_TO_CONN(entry_connection_new(type
, socket_family
));
462 return TO_CONN(dir_connection_new(socket_family
));
464 case CONN_TYPE_CONTROL
:
465 return TO_CONN(control_connection_new(socket_family
));
467 CASE_ANY_LISTENER_TYPE
:
468 return TO_CONN(listener_connection_new(type
, socket_family
));
471 connection_t
*conn
= tor_malloc_zero(sizeof(connection_t
));
472 connection_init(time(NULL
), conn
, type
, socket_family
);
478 /** Initializes conn. (you must call connection_add() to link it into the main
481 * Set conn-\>magic to the correct value.
483 * Set conn-\>type to <b>type</b>. Set conn-\>s and conn-\>conn_array_index to
484 * -1 to signify they are not yet assigned.
486 * Initialize conn's timestamps to now.
489 connection_init(time_t now
, connection_t
*conn
, int type
, int socket_family
)
491 static uint64_t n_connections_allocated
= 1;
495 case CONN_TYPE_EXT_OR
:
496 conn
->magic
= OR_CONNECTION_MAGIC
;
499 conn
->magic
= EDGE_CONNECTION_MAGIC
;
502 conn
->magic
= ENTRY_CONNECTION_MAGIC
;
505 conn
->magic
= DIR_CONNECTION_MAGIC
;
507 case CONN_TYPE_CONTROL
:
508 conn
->magic
= CONTROL_CONNECTION_MAGIC
;
510 CASE_ANY_LISTENER_TYPE
:
511 conn
->magic
= LISTENER_CONNECTION_MAGIC
;
514 conn
->magic
= BASE_CONNECTION_MAGIC
;
518 conn
->s
= TOR_INVALID_SOCKET
; /* give it a default of 'not used' */
519 conn
->conn_array_index
= -1; /* also default to 'not used' */
520 conn
->global_identifier
= n_connections_allocated
++;
523 conn
->socket_family
= socket_family
;
524 if (!connection_is_listener(conn
)) {
525 /* listeners never use their buf */
526 conn
->inbuf
= buf_new();
527 conn
->outbuf
= buf_new();
530 conn
->timestamp_created
= now
;
531 conn
->timestamp_last_read_allowed
= now
;
532 conn
->timestamp_last_write_allowed
= now
;
535 /** Create a link between <b>conn_a</b> and <b>conn_b</b>. */
537 connection_link_connections(connection_t
*conn_a
, connection_t
*conn_b
)
539 tor_assert(! SOCKET_OK(conn_a
->s
));
540 tor_assert(! SOCKET_OK(conn_b
->s
));
544 conn_a
->linked_conn
= conn_b
;
545 conn_b
->linked_conn
= conn_a
;
548 /** Return true iff the provided connection listener type supports AF_UNIX
551 conn_listener_type_supports_af_unix(int type
)
553 /* For now only control ports or SOCKS ports can be Unix domain sockets
554 * and listeners at the same time */
556 case CONN_TYPE_CONTROL_LISTENER
:
557 case CONN_TYPE_AP_LISTENER
:
564 /** Deallocate memory used by <b>conn</b>. Deallocate its buffers if
565 * necessary, close its socket if necessary, and mark the directory as dirty
566 * if <b>conn</b> is an OR or OP connection.
569 connection_free_minimal(connection_t
*conn
)
576 switch (conn
->type
) {
578 case CONN_TYPE_EXT_OR
:
579 tor_assert(conn
->magic
== OR_CONNECTION_MAGIC
);
580 mem
= TO_OR_CONN(conn
);
581 memlen
= sizeof(or_connection_t
);
584 tor_assert(conn
->magic
== ENTRY_CONNECTION_MAGIC
);
585 mem
= TO_ENTRY_CONN(conn
);
586 memlen
= sizeof(entry_connection_t
);
589 tor_assert(conn
->magic
== EDGE_CONNECTION_MAGIC
);
590 mem
= TO_EDGE_CONN(conn
);
591 memlen
= sizeof(edge_connection_t
);
594 tor_assert(conn
->magic
== DIR_CONNECTION_MAGIC
);
595 mem
= TO_DIR_CONN(conn
);
596 memlen
= sizeof(dir_connection_t
);
598 case CONN_TYPE_CONTROL
:
599 tor_assert(conn
->magic
== CONTROL_CONNECTION_MAGIC
);
600 mem
= TO_CONTROL_CONN(conn
);
601 memlen
= sizeof(control_connection_t
);
603 CASE_ANY_LISTENER_TYPE
:
604 tor_assert(conn
->magic
== LISTENER_CONNECTION_MAGIC
);
605 mem
= TO_LISTENER_CONN(conn
);
606 memlen
= sizeof(listener_connection_t
);
609 tor_assert(conn
->magic
== BASE_CONNECTION_MAGIC
);
611 memlen
= sizeof(connection_t
);
616 log_info(LD_GENERAL
, "Freeing linked %s connection [%s] with %d "
617 "bytes on inbuf, %d on outbuf.",
618 conn_type_to_string(conn
->type
),
619 conn_state_to_string(conn
->type
, conn
->state
),
620 (int)connection_get_inbuf_len(conn
),
621 (int)connection_get_outbuf_len(conn
));
624 if (!connection_is_listener(conn
)) {
625 buf_free(conn
->inbuf
);
626 buf_free(conn
->outbuf
);
628 if (conn
->socket_family
== AF_UNIX
) {
629 /* For now only control and SOCKS ports can be Unix domain sockets
630 * and listeners at the same time */
631 tor_assert(conn_listener_type_supports_af_unix(conn
->type
));
633 if (unlink(conn
->address
) < 0 && errno
!= ENOENT
) {
634 log_warn(LD_NET
, "Could not unlink %s: %s", conn
->address
,
640 tor_free(conn
->address
);
642 if (connection_speaks_cells(conn
)) {
643 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
645 if (! SOCKET_OK(conn
->s
)) {
646 /* The socket has been closed by somebody else; we must tell the
647 * TLS object not to close it. */
648 tor_tls_release_socket(or_conn
->tls
);
650 /* The tor_tls_free() call below will close the socket; we must tell
651 * the code below not to close it a second time. */
652 tor_release_socket_ownership(conn
->s
);
653 conn
->s
= TOR_INVALID_SOCKET
;
655 tor_tls_free(or_conn
->tls
);
658 or_handshake_state_free(or_conn
->handshake_state
);
659 or_conn
->handshake_state
= NULL
;
660 tor_free(or_conn
->nickname
);
662 /* Owww, this shouldn't happen, but... */
663 channel_t
*base_chan
= TLS_CHAN_TO_BASE(or_conn
->chan
);
664 tor_assert(base_chan
);
666 "Freeing orconn at %p, saw channel %p with ID "
667 "%"PRIu64
" left un-NULLed",
669 base_chan
->global_identifier
);
670 if (!CHANNEL_FINISHED(base_chan
)) {
671 channel_close_for_error(base_chan
);
674 or_conn
->chan
->conn
= NULL
;
675 or_conn
->chan
= NULL
;
678 if (conn
->type
== CONN_TYPE_AP
) {
679 entry_connection_t
*entry_conn
= TO_ENTRY_CONN(conn
);
680 tor_free(entry_conn
->chosen_exit_name
);
681 tor_free(entry_conn
->original_dest_address
);
682 if (entry_conn
->socks_request
)
683 socks_request_free(entry_conn
->socks_request
);
684 if (entry_conn
->pending_optimistic_data
) {
685 buf_free(entry_conn
->pending_optimistic_data
);
687 if (entry_conn
->sending_optimistic_data
) {
688 buf_free(entry_conn
->sending_optimistic_data
);
691 if (CONN_IS_EDGE(conn
)) {
692 rend_data_free(TO_EDGE_CONN(conn
)->rend_data
);
693 hs_ident_edge_conn_free(TO_EDGE_CONN(conn
)->hs_ident
);
695 if (conn
->type
== CONN_TYPE_CONTROL
) {
696 control_connection_t
*control_conn
= TO_CONTROL_CONN(conn
);
697 tor_free(control_conn
->safecookie_client_hash
);
698 tor_free(control_conn
->incoming_cmd
);
699 if (control_conn
->ephemeral_onion_services
) {
700 SMARTLIST_FOREACH(control_conn
->ephemeral_onion_services
, char *, cp
, {
701 memwipe(cp
, 0, strlen(cp
));
704 smartlist_free(control_conn
->ephemeral_onion_services
);
708 /* Probably already freed by connection_free. */
709 tor_event_free(conn
->read_event
);
710 tor_event_free(conn
->write_event
);
711 conn
->read_event
= conn
->write_event
= NULL
;
713 if (conn
->type
== CONN_TYPE_DIR
) {
714 dir_connection_t
*dir_conn
= TO_DIR_CONN(conn
);
715 tor_free(dir_conn
->requested_resource
);
717 tor_compress_free(dir_conn
->compress_state
);
718 if (dir_conn
->spool
) {
719 SMARTLIST_FOREACH(dir_conn
->spool
, spooled_resource_t
*, spooled
,
720 spooled_resource_free(spooled
));
721 smartlist_free(dir_conn
->spool
);
724 rend_data_free(dir_conn
->rend_data
);
725 hs_ident_dir_conn_free(dir_conn
->hs_ident
);
726 if (dir_conn
->guard_state
) {
727 /* Cancel before freeing, if it's still there. */
728 entry_guard_cancel(&dir_conn
->guard_state
);
730 circuit_guard_state_free(dir_conn
->guard_state
);
733 if (SOCKET_OK(conn
->s
)) {
734 log_debug(LD_NET
,"closing fd %d.",(int)conn
->s
);
735 tor_close_socket(conn
->s
);
736 conn
->s
= TOR_INVALID_SOCKET
;
739 if (conn
->type
== CONN_TYPE_OR
&&
740 !tor_digest_is_zero(TO_OR_CONN(conn
)->identity_digest
)) {
741 log_warn(LD_BUG
, "called on OR conn with non-zeroed identity_digest");
742 connection_or_clear_identity(TO_OR_CONN(conn
));
744 if (conn
->type
== CONN_TYPE_OR
|| conn
->type
== CONN_TYPE_EXT_OR
) {
745 connection_or_remove_from_ext_or_id_map(TO_OR_CONN(conn
));
746 tor_free(TO_OR_CONN(conn
)->ext_or_conn_id
);
747 tor_free(TO_OR_CONN(conn
)->ext_or_auth_correct_client_hash
);
748 tor_free(TO_OR_CONN(conn
)->ext_or_transport
);
751 memwipe(mem
, 0xCC, memlen
); /* poison memory */
755 /** Make sure <b>conn</b> isn't in any of the global conn lists; then free it.
758 connection_free_
,(connection_t
*conn
))
762 tor_assert(!connection_is_on_closeable_list(conn
));
763 tor_assert(!connection_in_array(conn
));
764 if (BUG(conn
->linked_conn
)) {
765 conn
->linked_conn
->linked_conn
= NULL
;
766 if (! conn
->linked_conn
->marked_for_close
&&
767 conn
->linked_conn
->reading_from_linked_conn
)
768 connection_start_reading(conn
->linked_conn
);
769 conn
->linked_conn
= NULL
;
771 if (connection_speaks_cells(conn
)) {
772 if (!tor_digest_is_zero(TO_OR_CONN(conn
)->identity_digest
)) {
773 connection_or_clear_identity(TO_OR_CONN(conn
));
776 if (conn
->type
== CONN_TYPE_CONTROL
) {
777 connection_control_closed(TO_CONTROL_CONN(conn
));
781 if (conn
->type
== CONN_TYPE_AP
) {
782 connection_ap_warn_and_unmark_if_pending_circ(TO_ENTRY_CONN(conn
),
787 /* Notify the circuit creation DoS mitigation subsystem that an OR client
788 * connection has been closed. And only do that if we track it. */
789 if (conn
->type
== CONN_TYPE_OR
) {
790 dos_close_client_conn(TO_OR_CONN(conn
));
793 connection_unregister_events(conn
);
794 connection_free_minimal(conn
);
798 * Called when we're about to finally unlink and free a connection:
799 * perform necessary accounting and cleanup
800 * - Directory conns that failed to fetch a rendezvous descriptor
801 * need to inform pending rendezvous streams.
802 * - OR conns need to call rep_hist_note_*() to record status.
803 * - AP conns need to send a socks reject if necessary.
804 * - Exit conns need to call connection_dns_remove() if necessary.
805 * - AP and Exit conns need to send an end cell if they can.
806 * - DNS conns need to fail any resolves that are pending on them.
807 * - OR and edge connections need to be unlinked from circuits.
810 connection_about_to_close_connection(connection_t
*conn
)
812 tor_assert(conn
->marked_for_close
);
814 switch (conn
->type
) {
816 connection_dir_about_to_close(TO_DIR_CONN(conn
));
819 case CONN_TYPE_EXT_OR
:
820 connection_or_about_to_close(TO_OR_CONN(conn
));
823 connection_ap_about_to_close(TO_ENTRY_CONN(conn
));
826 connection_exit_about_to_close(TO_EDGE_CONN(conn
));
831 /** Return true iff connection_close_immediate() has been called on this
833 #define CONN_IS_CLOSED(c) \
834 ((c)->linked ? ((c)->linked_conn_is_closed) : (! SOCKET_OK(c->s)))
836 /** Close the underlying socket for <b>conn</b>, so we don't try to
837 * flush it. Must be used in conjunction with (right before)
838 * connection_mark_for_close().
841 connection_close_immediate(connection_t
*conn
)
843 assert_connection_ok(conn
,0);
844 if (CONN_IS_CLOSED(conn
)) {
845 log_err(LD_BUG
,"Attempt to close already-closed connection.");
846 tor_fragile_assert();
849 if (conn
->outbuf_flushlen
) {
850 log_info(LD_NET
,"fd %d, type %s, state %s, %d bytes on outbuf.",
851 (int)conn
->s
, conn_type_to_string(conn
->type
),
852 conn_state_to_string(conn
->type
, conn
->state
),
853 (int)conn
->outbuf_flushlen
);
856 connection_unregister_events(conn
);
858 /* Prevent the event from getting unblocked. */
859 conn
->read_blocked_on_bw
= 0;
860 conn
->write_blocked_on_bw
= 0;
862 if (SOCKET_OK(conn
->s
))
863 tor_close_socket(conn
->s
);
864 conn
->s
= TOR_INVALID_SOCKET
;
866 conn
->linked_conn_is_closed
= 1;
868 buf_clear(conn
->outbuf
);
869 conn
->outbuf_flushlen
= 0;
872 /** Mark <b>conn</b> to be closed next time we loop through
873 * conn_close_if_marked() in main.c. */
875 connection_mark_for_close_(connection_t
*conn
, int line
, const char *file
)
877 assert_connection_ok(conn
,0);
879 tor_assert(line
< 1<<16); /* marked_for_close can only fit a uint16_t. */
882 if (conn
->type
== CONN_TYPE_OR
) {
884 * An or_connection should have been closed through one of the channel-
885 * aware functions in connection_or.c. We'll assume this is an error
886 * close and do that, and log a bug warning.
888 log_warn(LD_CHANNEL
| LD_BUG
,
889 "Something tried to close an or_connection_t without going "
890 "through channels at %s:%d",
892 connection_or_close_for_error(TO_OR_CONN(conn
), 0);
894 /* Pass it down to the real function */
895 connection_mark_for_close_internal_(conn
, line
, file
);
899 /** Mark <b>conn</b> to be closed next time we loop through
900 * conn_close_if_marked() in main.c; the _internal version bypasses the
901 * CONN_TYPE_OR checks; this should be called when you either are sure that
902 * if this is an or_connection_t the controlling channel has been notified
903 * (e.g. with connection_or_notify_error()), or you actually are the
904 * connection_or_close_for_error() or connection_or_close_normally() function.
905 * For all other cases, use connection_mark_and_flush() instead, which
906 * checks for or_connection_t properly, instead. See below.
909 connection_mark_for_close_internal_
, (connection_t
*conn
,
910 int line
, const char *file
))
912 assert_connection_ok(conn
,0);
914 tor_assert(line
< 1<<16); /* marked_for_close can only fit a uint16_t. */
917 if (conn
->marked_for_close
) {
918 log_warn(LD_BUG
,"Duplicate call to connection_mark_for_close at %s:%d"
919 " (first at %s:%d)", file
, line
, conn
->marked_for_close_file
,
920 conn
->marked_for_close
);
921 tor_fragile_assert();
925 if (conn
->type
== CONN_TYPE_OR
) {
927 * Bad news if this happens without telling the controlling channel; do
928 * this so we can find things that call this wrongly when the asserts hit.
930 log_debug(LD_CHANNEL
,
931 "Calling connection_mark_for_close_internal_() on an OR conn "
936 conn
->marked_for_close
= line
;
937 conn
->marked_for_close_file
= file
;
938 add_connection_to_closeable_list(conn
);
940 /* in case we're going to be held-open-til-flushed, reset
941 * the number of seconds since last successful write, so
942 * we get our whole 15 seconds */
943 conn
->timestamp_last_write_allowed
= time(NULL
);
946 /** Find each connection that has hold_open_until_flushed set to
947 * 1 but hasn't written in the past 15 seconds, and set
948 * hold_open_until_flushed to 0. This means it will get cleaned
949 * up in the next loop through close_if_marked() in main.c.
952 connection_expire_held_open(void)
955 smartlist_t
*conns
= get_connection_array();
959 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, conn
) {
960 /* If we've been holding the connection open, but we haven't written
963 if (conn
->hold_open_until_flushed
) {
964 tor_assert(conn
->marked_for_close
);
965 if (now
- conn
->timestamp_last_write_allowed
>= 15) {
967 if (conn
->type
== CONN_TYPE_EXIT
||
968 (conn
->type
== CONN_TYPE_DIR
&&
969 conn
->purpose
== DIR_PURPOSE_SERVER
))
972 severity
= LOG_NOTICE
;
973 log_fn(severity
, LD_NET
,
974 "Giving up on marked_for_close conn that's been flushing "
975 "for 15s (fd %d, type %s, state %s).",
976 (int)conn
->s
, conn_type_to_string(conn
->type
),
977 conn_state_to_string(conn
->type
, conn
->state
));
978 conn
->hold_open_until_flushed
= 0;
981 } SMARTLIST_FOREACH_END(conn
);
984 #if defined(HAVE_SYS_UN_H) || defined(RUNNING_DOXYGEN)
985 /** Create an AF_UNIX listenaddr struct.
986 * <b>listenaddress</b> provides the path to the Unix socket.
988 * Eventually <b>listenaddress</b> will also optionally contain user, group,
989 * and file permissions for the new socket. But not yet. XXX
990 * Also, since we do not create the socket here the information doesn't help
993 * If not NULL <b>readable_address</b> will contain a copy of the path part of
994 * <b>listenaddress</b>.
996 * The listenaddr struct has to be freed by the caller.
998 static struct sockaddr_un
*
999 create_unix_sockaddr(const char *listenaddress
, char **readable_address
,
1002 struct sockaddr_un
*sockaddr
= NULL
;
1004 sockaddr
= tor_malloc_zero(sizeof(struct sockaddr_un
));
1005 sockaddr
->sun_family
= AF_UNIX
;
1006 if (strlcpy(sockaddr
->sun_path
, listenaddress
, sizeof(sockaddr
->sun_path
))
1007 >= sizeof(sockaddr
->sun_path
)) {
1008 log_warn(LD_CONFIG
, "Unix socket path '%s' is too long to fit.",
1009 escaped(listenaddress
));
1014 if (readable_address
)
1015 *readable_address
= tor_strdup(listenaddress
);
1017 *len_out
= sizeof(struct sockaddr_un
);
1020 #else /* !(defined(HAVE_SYS_UN_H) || defined(RUNNING_DOXYGEN)) */
1021 static struct sockaddr
*
1022 create_unix_sockaddr(const char *listenaddress
, char **readable_address
,
1025 (void)listenaddress
;
1026 (void)readable_address
;
1027 log_fn(LOG_ERR
, LD_BUG
,
1028 "Unix domain sockets not supported, yet we tried to create one.");
1030 tor_fragile_assert();
1033 #endif /* defined(HAVE_SYS_UN_H) || defined(RUNNING_DOXYGEN) */
1035 /** Warn that an accept or a connect has failed because we're running out of
1036 * TCP sockets we can use on current system. Rate-limit these warnings so
1037 * that we don't spam the log. */
1039 warn_too_many_conns(void)
1041 #define WARN_TOO_MANY_CONNS_INTERVAL (6*60*60)
1042 static ratelim_t last_warned
= RATELIM_INIT(WARN_TOO_MANY_CONNS_INTERVAL
);
1044 if ((m
= rate_limit_log(&last_warned
, approx_time()))) {
1045 int n_conns
= get_n_open_sockets();
1046 log_warn(LD_NET
,"Failing because we have %d connections already. Please "
1047 "read doc/TUNING for guidance.%s", n_conns
, m
);
1049 control_event_general_status(LOG_WARN
, "TOO_MANY_CONNECTIONS CURRENT=%d",
1054 #ifdef HAVE_SYS_UN_H
1056 #define UNIX_SOCKET_PURPOSE_CONTROL_SOCKET 0
1057 #define UNIX_SOCKET_PURPOSE_SOCKS_SOCKET 1
1059 /** Check if the purpose isn't one of the ones we know what to do with */
1062 is_valid_unix_socket_purpose(int purpose
)
1067 case UNIX_SOCKET_PURPOSE_CONTROL_SOCKET
:
1068 case UNIX_SOCKET_PURPOSE_SOCKS_SOCKET
:
1076 /** Return a string description of a unix socket purpose */
1078 unix_socket_purpose_to_string(int purpose
)
1080 const char *s
= "unknown-purpose socket";
1083 case UNIX_SOCKET_PURPOSE_CONTROL_SOCKET
:
1084 s
= "control socket";
1086 case UNIX_SOCKET_PURPOSE_SOCKS_SOCKET
:
1094 /** Check whether we should be willing to open an AF_UNIX socket in
1095 * <b>path</b>. Return 0 if we should go ahead and -1 if we shouldn't. */
1097 check_location_for_unix_socket(const or_options_t
*options
, const char *path
,
1098 int purpose
, const port_cfg_t
*port
)
1103 tor_assert(is_valid_unix_socket_purpose(purpose
));
1105 p
= tor_strdup(path
);
1106 cpd_check_t flags
= CPD_CHECK_MODE_ONLY
;
1107 if (get_parent_directory(p
)<0 || p
[0] != '/') {
1108 log_warn(LD_GENERAL
, "Bad unix socket address '%s'. Tor does not support "
1109 "relative paths for unix sockets.", path
);
1113 if (port
->is_world_writable
) {
1114 /* World-writable sockets can go anywhere. */
1119 if (port
->is_group_writable
) {
1120 flags
|= CPD_GROUP_OK
;
1123 if (port
->relax_dirmode_check
) {
1124 flags
|= CPD_RELAX_DIRMODE_CHECK
;
1127 if (check_private_dir(p
, flags
, options
->User
) < 0) {
1128 char *escpath
, *escdir
;
1129 escpath
= esc_for_log(path
);
1130 escdir
= esc_for_log(p
);
1131 log_warn(LD_GENERAL
, "Before Tor can create a %s in %s, the directory "
1132 "%s needs to exist, and to be accessible only by the user%s "
1133 "account that is running Tor. (On some Unix systems, anybody "
1134 "who can list a socket can connect to it, so Tor is being "
1136 unix_socket_purpose_to_string(purpose
), escpath
, escdir
,
1137 port
->is_group_writable
? " and group" : "");
1148 #endif /* defined(HAVE_SYS_UN_H) */
1150 /** Tell the TCP stack that it shouldn't wait for a long time after
1151 * <b>sock</b> has closed before reusing its port. Return 0 on success,
1154 make_socket_reuseable(tor_socket_t sock
)
1162 /* REUSEADDR on normal places means you can rebind to the port
1163 * right after somebody else has let it go. But REUSEADDR on win32
1164 * means you can bind to the port _even when somebody else
1165 * already has it bound_. So, don't do that on Win32. */
1166 if (setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, (void*) &one
,
1167 (socklen_t
)sizeof(one
)) == -1) {
1171 #endif /* defined(_WIN32) */
1175 /** Tell the Windows TCP stack to prevent other applications from receiving
1176 * traffic from tor's open ports. Return 0 on success, -1 on failure. */
1178 make_win32_socket_exclusive(tor_socket_t sock
)
1180 #ifdef SO_EXCLUSIVEADDRUSE
1183 /* Any socket that sets REUSEADDR on win32 can bind to a port _even when
1184 * somebody else already has it bound_, and _even if the original socket
1185 * didn't set REUSEADDR_. Use EXCLUSIVEADDRUSE to prevent this port-stealing
1187 if (setsockopt(sock
, SOL_SOCKET
, SO_EXCLUSIVEADDRUSE
, (void*) &one
,
1188 (socklen_t
)sizeof(one
))) {
1192 #else /* !(defined(SO_EXCLUSIVEADDRUSE)) */
1195 #endif /* defined(SO_EXCLUSIVEADDRUSE) */
1197 #endif /* defined(_WIN32) */
1199 /** Max backlog to pass to listen. We start at */
1200 static int listen_limit
= INT_MAX
;
1202 /* Listen on <b>fd</b> with appropriate backlog. Return as for listen. */
1204 tor_listen(tor_socket_t fd
)
1208 if ((r
= listen(fd
, listen_limit
)) < 0) {
1209 if (listen_limit
== SOMAXCONN
)
1211 if ((r
= listen(fd
, SOMAXCONN
)) == 0) {
1212 listen_limit
= SOMAXCONN
;
1213 log_warn(LD_NET
, "Setting listen backlog to INT_MAX connections "
1214 "didn't work, but SOMAXCONN did. Lowering backlog limit.");
1220 /** Bind a new non-blocking socket listening to the socket described
1221 * by <b>listensockaddr</b>.
1223 * <b>address</b> is only used for logging purposes and to add the information
1226 * Set <b>addr_in_use</b> to true in case socket binding fails with
1229 static connection_t
*
1230 connection_listener_new(const struct sockaddr
*listensockaddr
,
1232 int type
, const char *address
,
1233 const port_cfg_t
*port_cfg
,
1236 listener_connection_t
*lis_conn
;
1237 connection_t
*conn
= NULL
;
1238 tor_socket_t s
= TOR_INVALID_SOCKET
; /* the socket we're going to make */
1239 or_options_t
const *options
= get_options();
1240 (void) options
; /* Windows doesn't use this. */
1241 #if defined(HAVE_PWD_H) && defined(HAVE_SYS_UN_H)
1242 const struct passwd
*pw
= NULL
;
1244 uint16_t usePort
= 0, gotPort
= 0;
1245 int start_reading
= 0;
1246 static int global_next_session_group
= SESSION_GROUP_FIRST_AUTO
;
1253 if (listensockaddr
->sa_family
== AF_INET
||
1254 listensockaddr
->sa_family
== AF_INET6
) {
1255 int is_stream
= (type
!= CONN_TYPE_AP_DNS_LISTENER
);
1259 tor_addr_from_sockaddr(&addr
, listensockaddr
, &usePort
);
1260 log_notice(LD_NET
, "Opening %s on %s",
1261 conn_type_to_string(type
), fmt_addrport(&addr
, usePort
));
1263 s
= tor_open_socket_nonblocking(tor_addr_family(&addr
),
1264 is_stream
? SOCK_STREAM
: SOCK_DGRAM
,
1265 is_stream
? IPPROTO_TCP
: IPPROTO_UDP
);
1266 if (!SOCKET_OK(s
)) {
1267 int e
= tor_socket_errno(s
);
1268 if (ERRNO_IS_RESOURCE_LIMIT(e
)) {
1269 warn_too_many_conns();
1271 * We'll call the OOS handler at the error exit, so set the
1272 * exhaustion flag for it.
1276 log_warn(LD_NET
, "Socket creation failed: %s",
1277 tor_socket_strerror(e
));
1282 if (make_socket_reuseable(s
) < 0) {
1283 log_warn(LD_NET
, "Error setting SO_REUSEADDR flag on %s: %s",
1284 conn_type_to_string(type
),
1285 tor_socket_strerror(errno
));
1289 if (make_win32_socket_exclusive(s
) < 0) {
1290 log_warn(LD_NET
, "Error setting SO_EXCLUSIVEADDRUSE flag on %s: %s",
1291 conn_type_to_string(type
),
1292 tor_socket_strerror(errno
));
1294 #endif /* defined(_WIN32) */
1296 #if defined(USE_TRANSPARENT) && defined(IP_TRANSPARENT)
1297 if (options
->TransProxyType_parsed
== TPT_TPROXY
&&
1298 type
== CONN_TYPE_AP_TRANS_LISTENER
) {
1300 if (setsockopt(s
, SOL_IP
, IP_TRANSPARENT
, (void*)&one
,
1301 (socklen_t
)sizeof(one
)) < 0) {
1302 const char *extra
= "";
1303 int e
= tor_socket_errno(s
);
1305 extra
= "TransTPROXY requires root privileges or similar"
1307 log_warn(LD_NET
, "Error setting IP_TRANSPARENT flag: %s.%s",
1308 tor_socket_strerror(e
), extra
);
1311 #endif /* defined(USE_TRANSPARENT) && defined(IP_TRANSPARENT) */
1314 if (listensockaddr
->sa_family
== AF_INET6
) {
1316 /* We need to set IPV6_V6ONLY so that this socket can't get used for
1317 * IPv4 connections. */
1318 if (setsockopt(s
,IPPROTO_IPV6
, IPV6_V6ONLY
,
1319 (void*)&one
, (socklen_t
)sizeof(one
)) < 0) {
1320 int e
= tor_socket_errno(s
);
1321 log_warn(LD_NET
, "Error setting IPV6_V6ONLY flag: %s",
1322 tor_socket_strerror(e
));
1323 /* Keep going; probably not harmful. */
1326 #endif /* defined(IPV6_V6ONLY) */
1328 if (bind(s
,listensockaddr
,socklen
) < 0) {
1329 const char *helpfulhint
= "";
1330 int e
= tor_socket_errno(s
);
1331 if (ERRNO_IS_EADDRINUSE(e
)) {
1332 helpfulhint
= ". Is Tor already running?";
1336 log_warn(LD_NET
, "Could not bind to %s:%u: %s%s", address
, usePort
,
1337 tor_socket_strerror(e
), helpfulhint
);
1342 if (tor_listen(s
) < 0) {
1343 log_warn(LD_NET
, "Could not listen on %s:%u: %s", address
, usePort
,
1344 tor_socket_strerror(tor_socket_errno(s
)));
1353 struct sockaddr_storage ss
;
1354 socklen_t ss_len
=sizeof(ss
);
1355 if (getsockname(s
, (struct sockaddr
*)&ss
, &ss_len
)<0) {
1356 log_warn(LD_NET
, "getsockname() couldn't learn address for %s: %s",
1357 conn_type_to_string(type
),
1358 tor_socket_strerror(tor_socket_errno(s
)));
1361 tor_addr_from_sockaddr(&addr2
, (struct sockaddr
*)&ss
, &gotPort
);
1363 #ifdef HAVE_SYS_UN_H
1365 * AF_UNIX generic setup stuff
1367 } else if (listensockaddr
->sa_family
== AF_UNIX
) {
1368 /* We want to start reading for both AF_UNIX cases */
1371 tor_assert(conn_listener_type_supports_af_unix(type
));
1373 if (check_location_for_unix_socket(options
, address
,
1374 (type
== CONN_TYPE_CONTROL_LISTENER
) ?
1375 UNIX_SOCKET_PURPOSE_CONTROL_SOCKET
:
1376 UNIX_SOCKET_PURPOSE_SOCKS_SOCKET
, port_cfg
) < 0) {
1380 log_notice(LD_NET
, "Opening %s on %s",
1381 conn_type_to_string(type
), address
);
1383 tor_addr_make_unspec(&addr
);
1385 if (unlink(address
) < 0 && errno
!= ENOENT
) {
1386 log_warn(LD_NET
, "Could not unlink %s: %s", address
,
1391 s
= tor_open_socket_nonblocking(AF_UNIX
, SOCK_STREAM
, 0);
1392 if (! SOCKET_OK(s
)) {
1393 int e
= tor_socket_errno(s
);
1394 if (ERRNO_IS_RESOURCE_LIMIT(e
)) {
1395 warn_too_many_conns();
1397 * We'll call the OOS handler at the error exit, so set the
1398 * exhaustion flag for it.
1402 log_warn(LD_NET
,"Socket creation failed: %s.", strerror(e
));
1407 if (bind(s
, listensockaddr
,
1408 (socklen_t
)sizeof(struct sockaddr_un
)) == -1) {
1409 log_warn(LD_NET
,"Bind to %s failed: %s.", address
,
1410 tor_socket_strerror(tor_socket_errno(s
)));
1415 if (options
->User
) {
1416 pw
= tor_getpwnam(options
->User
);
1419 log_warn(LD_NET
,"Unable to chown() %s socket: user %s not found.",
1420 address
, options
->User
);
1422 } else if (fstat(s
, &st
) == 0 &&
1423 st
.st_uid
== pw
->pw_uid
&& st
.st_gid
== pw
->pw_gid
) {
1424 /* No change needed */
1425 } else if (chown(sandbox_intern_string(address
),
1426 pw
->pw_uid
, pw
->pw_gid
) < 0) {
1427 log_warn(LD_NET
,"Unable to chown() %s socket: %s.",
1428 address
, strerror(errno
));
1432 #endif /* defined(HAVE_PWD_H) */
1438 if (port_cfg
->is_world_writable
) {
1440 status
= "world-writable";
1441 } else if (port_cfg
->is_group_writable
) {
1443 status
= "group-writable";
1448 /* We need to use chmod; fchmod doesn't work on sockets on all
1450 if (fstat(s
, &st
) == 0 && (st
.st_mode
& 0777) == mode
) {
1451 /* no change needed */
1452 } else if (chmod(sandbox_intern_string(address
), mode
) < 0) {
1453 log_warn(LD_FS
,"Unable to make %s %s.", address
, status
);
1458 if (listen(s
, SOMAXCONN
) < 0) {
1459 log_warn(LD_NET
, "Could not listen on %s: %s", address
,
1460 tor_socket_strerror(tor_socket_errno(s
)));
1465 /* This code was introduced to help debug #28229. */
1467 socklen_t len
= sizeof(value
);
1469 if (!getsockopt(s
, SOL_SOCKET
, SO_ACCEPTCONN
, &value
, &len
)) {
1471 log_err(LD_NET
, "Could not listen on %s - "
1472 "getsockopt(.,SO_ACCEPTCONN,.) yields 0.", address
);
1476 #endif /* __APPLE__ */
1477 #endif /* defined(HAVE_SYS_UN_H) */
1479 log_err(LD_BUG
, "Got unexpected address family %d.",
1480 listensockaddr
->sa_family
);
1484 lis_conn
= listener_connection_new(type
, listensockaddr
->sa_family
);
1485 conn
= TO_CONN(lis_conn
);
1486 conn
->socket_family
= listensockaddr
->sa_family
;
1488 s
= TOR_INVALID_SOCKET
; /* Prevent double-close */
1489 conn
->address
= tor_strdup(address
);
1490 conn
->port
= gotPort
;
1491 tor_addr_copy(&conn
->addr
, &addr
);
1493 memcpy(&lis_conn
->entry_cfg
, &port_cfg
->entry_cfg
, sizeof(entry_port_cfg_t
));
1495 if (port_cfg
->entry_cfg
.isolation_flags
) {
1496 lis_conn
->entry_cfg
.isolation_flags
= port_cfg
->entry_cfg
.isolation_flags
;
1497 if (port_cfg
->entry_cfg
.session_group
>= 0) {
1498 lis_conn
->entry_cfg
.session_group
= port_cfg
->entry_cfg
.session_group
;
1500 /* This can wrap after around INT_MAX listeners are opened. But I don't
1501 * believe that matters, since you would need to open a ridiculous
1502 * number of listeners while keeping the early ones open before you ever
1503 * hit this. An OR with a dozen ports open, for example, would have to
1504 * close and re-open its listeners every second for 4 years nonstop.
1506 lis_conn
->entry_cfg
.session_group
= global_next_session_group
--;
1510 if (type
!= CONN_TYPE_AP_LISTENER
) {
1511 lis_conn
->entry_cfg
.ipv4_traffic
= 1;
1512 lis_conn
->entry_cfg
.ipv6_traffic
= 1;
1513 lis_conn
->entry_cfg
.prefer_ipv6
= 0;
1516 if (connection_add(conn
) < 0) { /* no space, forget it */
1517 log_warn(LD_NET
,"connection_add for listener failed. Giving up.");
1521 log_fn(usePort
==gotPort
? LOG_DEBUG
: LOG_NOTICE
, LD_NET
,
1522 "%s listening on port %u.",
1523 conn_type_to_string(type
), gotPort
);
1525 conn
->state
= LISTENER_STATE_READY
;
1526 if (start_reading
) {
1527 connection_start_reading(conn
);
1529 tor_assert(type
== CONN_TYPE_AP_DNS_LISTENER
);
1530 dnsserv_configure_listener(conn
);
1534 * Normal exit; call the OOS handler since connection count just changed;
1535 * the exhaustion flag will always be zero here though.
1537 connection_check_oos(get_n_open_sockets(), 0);
1539 if (conn
->socket_family
== AF_UNIX
) {
1540 log_notice(LD_NET
, "Opened %s on %s",
1541 conn_type_to_string(type
), conn
->address
);
1543 log_notice(LD_NET
, "Opened %s on %s",
1544 conn_type_to_string(type
), fmt_addrport(&addr
, gotPort
));
1550 tor_close_socket(s
);
1552 connection_free(conn
);
1554 /* Call the OOS handler, indicate if we saw an exhaustion-related error */
1555 connection_check_oos(get_n_open_sockets(), exhaustion
);
1561 * Create a new listener connection for a given <b>port</b>. In case we
1562 * for a reason that is not an error condition, set <b>defer</b>
1563 * to true. If we cannot bind listening socket because address is already
1564 * in use, set <b>addr_in_use</b> to true.
1566 static connection_t
*
1567 connection_listener_new_for_port(const port_cfg_t
*port
,
1568 int *defer
, int *addr_in_use
)
1571 struct sockaddr
*listensockaddr
;
1572 socklen_t listensocklen
= 0;
1574 int real_port
= port
->port
== CFG_AUTO_PORT
? 0 : port
->port
;
1575 tor_assert(real_port
<= UINT16_MAX
);
1580 if (port
->server_cfg
.no_listen
) {
1587 /* We don't need to be root to create a UNIX socket, so defer until after
1589 const or_options_t
*options
= get_options();
1590 if (port
->is_unix_addr
&& !geteuid() && (options
->User
) &&
1591 strcmp(options
->User
, "root")) {
1596 #endif /* !defined(_WIN32) */
1598 if (port
->is_unix_addr
) {
1599 listensockaddr
= (struct sockaddr
*)
1600 create_unix_sockaddr(port
->unix_addr
,
1601 &address
, &listensocklen
);
1603 listensockaddr
= tor_malloc(sizeof(struct sockaddr_storage
));
1604 listensocklen
= tor_addr_to_sockaddr(&port
->addr
,
1607 sizeof(struct sockaddr_storage
));
1608 address
= tor_addr_to_str_dup(&port
->addr
);
1611 if (listensockaddr
) {
1612 conn
= connection_listener_new(listensockaddr
, listensocklen
,
1613 port
->type
, address
, port
,
1615 tor_free(listensockaddr
);
1624 /** Do basic sanity checking on a newly received socket. Return 0
1625 * if it looks ok, else return -1.
1627 * Notably, some TCP stacks can erroneously have accept() return successfully
1628 * with socklen 0, when the client sends an RST before the accept call (as
1629 * nmap does). We want to detect that, and not go on with the connection.
1632 check_sockaddr(const struct sockaddr
*sa
, int len
, int level
)
1636 if (sa
->sa_family
== AF_INET
) {
1637 struct sockaddr_in
*sin
=(struct sockaddr_in
*)sa
;
1638 if (len
!= sizeof(struct sockaddr_in
)) {
1639 log_fn(level
, LD_NET
, "Length of address not as expected: %d vs %d",
1640 len
,(int)sizeof(struct sockaddr_in
));
1643 if (sin
->sin_addr
.s_addr
== 0 || sin
->sin_port
== 0) {
1644 log_fn(level
, LD_NET
,
1645 "Address for new connection has address/port equal to zero.");
1648 } else if (sa
->sa_family
== AF_INET6
) {
1649 struct sockaddr_in6
*sin6
=(struct sockaddr_in6
*)sa
;
1650 if (len
!= sizeof(struct sockaddr_in6
)) {
1651 log_fn(level
, LD_NET
, "Length of address not as expected: %d vs %d",
1652 len
,(int)sizeof(struct sockaddr_in6
));
1655 if (tor_mem_is_zero((void*)sin6
->sin6_addr
.s6_addr
, 16) ||
1656 sin6
->sin6_port
== 0) {
1657 log_fn(level
, LD_NET
,
1658 "Address for new connection has address/port equal to zero.");
1661 } else if (sa
->sa_family
== AF_UNIX
) {
1669 /** Check whether the socket family from an accepted socket <b>got</b> is the
1670 * same as the one that <b>listener</b> is waiting for. If it isn't, log
1671 * a useful message and return -1. Else return 0.
1673 * This is annoying, but can apparently happen on some Darwins. */
1675 check_sockaddr_family_match(sa_family_t got
, connection_t
*listener
)
1677 if (got
!= listener
->socket_family
) {
1678 log_info(LD_BUG
, "A listener connection returned a socket with a "
1679 "mismatched family. %s for addr_family %d gave us a socket "
1680 "with address family %d. Dropping.",
1681 conn_type_to_string(listener
->type
),
1682 (int)listener
->socket_family
,
1689 /** The listener connection <b>conn</b> told poll() it wanted to read.
1690 * Call accept() on conn-\>s, and add the new connection if necessary.
1693 connection_handle_listener_read(connection_t
*conn
, int new_type
)
1695 tor_socket_t news
; /* the new socket */
1696 connection_t
*newconn
= 0;
1697 /* information about the remote peer when connecting to other routers */
1698 struct sockaddr_storage addrbuf
;
1699 struct sockaddr
*remote
= (struct sockaddr
*)&addrbuf
;
1700 /* length of the remote address. Must be whatever accept() needs. */
1701 socklen_t remotelen
= (socklen_t
)sizeof(addrbuf
);
1702 const or_options_t
*options
= get_options();
1704 tor_assert((size_t)remotelen
>= sizeof(struct sockaddr_in
));
1705 memset(&addrbuf
, 0, sizeof(addrbuf
));
1707 news
= tor_accept_socket_nonblocking(conn
->s
,remote
,&remotelen
);
1708 if (!SOCKET_OK(news
)) { /* accept() error */
1709 int e
= tor_socket_errno(conn
->s
);
1710 if (ERRNO_IS_ACCEPT_EAGAIN(e
)) {
1712 * they hung up before we could accept(). that's fine.
1714 * give the OOS handler a chance to run though
1716 connection_check_oos(get_n_open_sockets(), 0);
1718 } else if (ERRNO_IS_RESOURCE_LIMIT(e
)) {
1719 warn_too_many_conns();
1720 /* Exhaustion; tell the OOS handler */
1721 connection_check_oos(get_n_open_sockets(), 1);
1724 /* else there was a real error. */
1725 log_warn(LD_NET
,"accept() failed: %s. Closing listener.",
1726 tor_socket_strerror(e
));
1727 connection_mark_for_close(conn
);
1728 /* Tell the OOS handler about this too */
1729 connection_check_oos(get_n_open_sockets(), 0);
1733 "Connection accepted on socket %d (child of fd %d).",
1734 (int)news
,(int)conn
->s
);
1736 /* We accepted a new conn; run OOS handler */
1737 connection_check_oos(get_n_open_sockets(), 0);
1739 if (make_socket_reuseable(news
) < 0) {
1740 if (tor_socket_errno(news
) == EINVAL
) {
1741 /* This can happen on OSX if we get a badly timed shutdown. */
1742 log_debug(LD_NET
, "make_socket_reuseable returned EINVAL");
1744 log_warn(LD_NET
, "Error setting SO_REUSEADDR flag on %s: %s",
1745 conn_type_to_string(new_type
),
1746 tor_socket_strerror(errno
));
1748 tor_close_socket(news
);
1752 if (options
->ConstrainedSockets
)
1753 set_constrained_socket_buffers(news
, (int)options
->ConstrainedSockSize
);
1755 if (check_sockaddr_family_match(remote
->sa_family
, conn
) < 0) {
1756 tor_close_socket(news
);
1760 if (conn
->socket_family
== AF_INET
|| conn
->socket_family
== AF_INET6
||
1761 (conn
->socket_family
== AF_UNIX
&& new_type
== CONN_TYPE_AP
)) {
1764 if (check_sockaddr(remote
, remotelen
, LOG_INFO
)<0) {
1766 "accept() returned a strange address; closing connection.");
1767 tor_close_socket(news
);
1771 tor_addr_from_sockaddr(&addr
, remote
, &port
);
1773 /* process entrance policies here, before we even create the connection */
1774 if (new_type
== CONN_TYPE_AP
) {
1775 /* check sockspolicy to see if we should accept it */
1776 if (socks_policy_permits_address(&addr
) == 0) {
1778 "Denying socks connection from untrusted address %s.",
1779 fmt_and_decorate_addr(&addr
));
1780 tor_close_socket(news
);
1784 if (new_type
== CONN_TYPE_DIR
) {
1785 /* check dirpolicy to see if we should accept it */
1786 if (dir_policy_permits_address(&addr
) == 0) {
1787 log_notice(LD_DIRSERV
,"Denying dir connection from address %s.",
1788 fmt_and_decorate_addr(&addr
));
1789 tor_close_socket(news
);
1793 if (new_type
== CONN_TYPE_OR
) {
1794 /* Assess with the connection DoS mitigation subsystem if this address
1795 * can open a new connection. */
1796 if (dos_conn_addr_get_defense_type(&addr
) == DOS_CONN_DEFENSE_CLOSE
) {
1797 tor_close_socket(news
);
1802 newconn
= connection_new(new_type
, conn
->socket_family
);
1805 /* remember the remote address */
1806 tor_addr_copy(&newconn
->addr
, &addr
);
1807 if (new_type
== CONN_TYPE_AP
&& conn
->socket_family
== AF_UNIX
) {
1809 newconn
->address
= tor_strdup(conn
->address
);
1811 newconn
->port
= port
;
1812 newconn
->address
= tor_addr_to_str_dup(&addr
);
1815 if (new_type
== CONN_TYPE_AP
&& conn
->socket_family
!= AF_UNIX
) {
1816 log_info(LD_NET
, "New SOCKS connection opened from %s.",
1817 fmt_and_decorate_addr(&addr
));
1819 if (new_type
== CONN_TYPE_AP
&& conn
->socket_family
== AF_UNIX
) {
1820 log_info(LD_NET
, "New SOCKS AF_UNIX connection opened");
1822 if (new_type
== CONN_TYPE_CONTROL
) {
1823 log_notice(LD_CONTROL
, "New control connection opened from %s.",
1824 fmt_and_decorate_addr(&addr
));
1827 } else if (conn
->socket_family
== AF_UNIX
&& conn
->type
!= CONN_TYPE_AP
) {
1828 tor_assert(conn
->type
== CONN_TYPE_CONTROL_LISTENER
);
1829 tor_assert(new_type
== CONN_TYPE_CONTROL
);
1830 log_notice(LD_CONTROL
, "New control connection opened.");
1832 newconn
= connection_new(new_type
, conn
->socket_family
);
1835 /* remember the remote address -- do we have anything sane to put here? */
1836 tor_addr_make_unspec(&newconn
->addr
);
1838 newconn
->address
= tor_strdup(conn
->address
);
1843 if (connection_add(newconn
) < 0) { /* no space, forget it */
1844 connection_free(newconn
);
1845 return 0; /* no need to tear down the parent */
1848 if (connection_init_accepted_conn(newconn
, TO_LISTENER_CONN(conn
)) < 0) {
1849 if (! newconn
->marked_for_close
)
1850 connection_mark_for_close(newconn
);
1856 /** Initialize states for newly accepted connection <b>conn</b>.
1858 * If conn is an OR, start the TLS handshake.
1860 * If conn is a transparent AP, get its original destination
1861 * and place it in circuit_wait.
1863 * The <b>listener</b> parameter is only used for AP connections.
1866 connection_init_accepted_conn(connection_t
*conn
,
1867 const listener_connection_t
*listener
)
1871 connection_start_reading(conn
);
1873 switch (conn
->type
) {
1874 case CONN_TYPE_EXT_OR
:
1875 /* Initiate Extended ORPort authentication. */
1876 return connection_ext_or_start_auth(TO_OR_CONN(conn
));
1878 connection_or_event_status(TO_OR_CONN(conn
), OR_CONN_EVENT_NEW
, 0);
1879 rv
= connection_tls_start_handshake(TO_OR_CONN(conn
), 1);
1881 connection_or_close_for_error(TO_OR_CONN(conn
), 0);
1886 memcpy(&TO_ENTRY_CONN(conn
)->entry_cfg
, &listener
->entry_cfg
,
1887 sizeof(entry_port_cfg_t
));
1888 TO_ENTRY_CONN(conn
)->nym_epoch
= get_signewnym_epoch();
1889 TO_ENTRY_CONN(conn
)->socks_request
->listener_type
= listener
->base_
.type
;
1891 /* Any incoming connection on an entry port counts as user activity. */
1892 note_user_activity(approx_time());
1894 switch (TO_CONN(listener
)->type
) {
1895 case CONN_TYPE_AP_LISTENER
:
1896 conn
->state
= AP_CONN_STATE_SOCKS_WAIT
;
1897 TO_ENTRY_CONN(conn
)->socks_request
->socks_prefer_no_auth
=
1898 listener
->entry_cfg
.socks_prefer_no_auth
;
1900 case CONN_TYPE_AP_TRANS_LISTENER
:
1901 TO_ENTRY_CONN(conn
)->is_transparent_ap
= 1;
1902 /* XXXX028 -- is this correct still, with the addition of
1903 * pending_entry_connections ? */
1904 conn
->state
= AP_CONN_STATE_CIRCUIT_WAIT
;
1905 return connection_ap_process_transparent(TO_ENTRY_CONN(conn
));
1906 case CONN_TYPE_AP_NATD_LISTENER
:
1907 TO_ENTRY_CONN(conn
)->is_transparent_ap
= 1;
1908 conn
->state
= AP_CONN_STATE_NATD_WAIT
;
1910 case CONN_TYPE_AP_HTTP_CONNECT_LISTENER
:
1911 conn
->state
= AP_CONN_STATE_HTTP_CONNECT_WAIT
;
1915 conn
->purpose
= DIR_PURPOSE_SERVER
;
1916 conn
->state
= DIR_CONN_STATE_SERVER_COMMAND_WAIT
;
1918 case CONN_TYPE_CONTROL
:
1919 conn
->state
= CONTROL_CONN_STATE_NEEDAUTH
;
1925 /** Take conn, make a nonblocking socket; try to connect to
1926 * sa, binding to bindaddr if sa is not localhost. If fail, return -1 and if
1927 * applicable put your best guess about errno into *<b>socket_error</b>.
1928 * If connected return 1, if EAGAIN return 0.
1930 MOCK_IMPL(STATIC
int,
1931 connection_connect_sockaddr
,(connection_t
*conn
,
1932 const struct sockaddr
*sa
,
1934 const struct sockaddr
*bindaddr
,
1935 socklen_t bindaddr_len
,
1940 const or_options_t
*options
= get_options();
1944 tor_assert(socket_error
);
1946 if (net_is_completely_disabled()) {
1947 /* We should never even try to connect anyplace if the network is
1948 * completely shut off.
1950 * (We don't check net_is_disabled() here, since we still sometimes
1951 * want to open connections when we're in soft hibernation.)
1953 static ratelim_t disablenet_violated
= RATELIM_INIT(30*60);
1954 *socket_error
= SOCK_ERRNO(ENETUNREACH
);
1955 log_fn_ratelim(&disablenet_violated
, LOG_WARN
, LD_BUG
,
1956 "Tried to open a socket with DisableNetwork set.");
1957 tor_fragile_assert();
1961 const int protocol_family
= sa
->sa_family
;
1962 const int proto
= (sa
->sa_family
== AF_INET6
||
1963 sa
->sa_family
== AF_INET
) ? IPPROTO_TCP
: 0;
1965 s
= tor_open_socket_nonblocking(protocol_family
, SOCK_STREAM
, proto
);
1966 if (! SOCKET_OK(s
)) {
1968 * Early OOS handler calls; it matters if it's an exhaustion-related
1971 *socket_error
= tor_socket_errno(s
);
1972 if (ERRNO_IS_RESOURCE_LIMIT(*socket_error
)) {
1973 warn_too_many_conns();
1974 connection_check_oos(get_n_open_sockets(), 1);
1976 log_warn(LD_NET
,"Error creating network socket: %s",
1977 tor_socket_strerror(*socket_error
));
1978 connection_check_oos(get_n_open_sockets(), 0);
1983 if (make_socket_reuseable(s
) < 0) {
1984 log_warn(LD_NET
, "Error setting SO_REUSEADDR flag on new connection: %s",
1985 tor_socket_strerror(errno
));
1989 * We've got the socket open; give the OOS handler a chance to check
1990 * against configured maximum socket number, but tell it no exhaustion
1993 connection_check_oos(get_n_open_sockets(), 0);
1995 if (bindaddr
&& bind(s
, bindaddr
, bindaddr_len
) < 0) {
1996 *socket_error
= tor_socket_errno(s
);
1997 log_warn(LD_NET
,"Error binding network socket: %s",
1998 tor_socket_strerror(*socket_error
));
1999 tor_close_socket(s
);
2003 tor_assert(options
);
2004 if (options
->ConstrainedSockets
)
2005 set_constrained_socket_buffers(s
, (int)options
->ConstrainedSockSize
);
2007 if (connect(s
, sa
, sa_len
) < 0) {
2008 int e
= tor_socket_errno(s
);
2009 if (!ERRNO_IS_CONN_EINPROGRESS(e
)) {
2010 /* yuck. kill it. */
2013 "connect() to socket failed: %s",
2014 tor_socket_strerror(e
));
2015 tor_close_socket(s
);
2022 /* it succeeded. we're connected. */
2023 log_fn(inprogress
? LOG_DEBUG
: LOG_INFO
, LD_NET
,
2024 "Connection to socket %s (sock "TOR_SOCKET_T_FORMAT
").",
2025 inprogress
? "in progress" : "established", s
);
2027 if (connection_add_connecting(conn
) < 0) {
2028 /* no space, forget it */
2029 *socket_error
= SOCK_ERRNO(ENOBUFS
);
2033 return inprogress
? 0 : 1;
2036 /* Log a message if connection attempt is made when IPv4 or IPv6 is disabled.
2037 * Log a less severe message if we couldn't conform to ClientPreferIPv6ORPort
2038 * or ClientPreferIPv6ORPort. */
2040 connection_connect_log_client_use_ip_version(const connection_t
*conn
)
2042 const or_options_t
*options
= get_options();
2044 /* Only clients care about ClientUseIPv4/6, bail out early on servers, and
2045 * on connections we don't care about */
2046 if (server_mode(options
) || !conn
|| conn
->type
== CONN_TYPE_EXIT
) {
2050 /* We're only prepared to log OR and DIR connections here */
2051 if (conn
->type
!= CONN_TYPE_OR
&& conn
->type
!= CONN_TYPE_DIR
) {
2055 const int must_ipv4
= !fascist_firewall_use_ipv6(options
);
2056 const int must_ipv6
= (options
->ClientUseIPv4
== 0);
2057 const int pref_ipv6
= (conn
->type
== CONN_TYPE_OR
2058 ? fascist_firewall_prefer_ipv6_orport(options
)
2059 : fascist_firewall_prefer_ipv6_dirport(options
));
2060 tor_addr_t real_addr
;
2061 tor_addr_make_null(&real_addr
, AF_UNSPEC
);
2063 /* OR conns keep the original address in real_addr, as addr gets overwritten
2064 * with the descriptor address */
2065 if (conn
->type
== CONN_TYPE_OR
) {
2066 const or_connection_t
*or_conn
= TO_OR_CONN((connection_t
*)conn
);
2067 tor_addr_copy(&real_addr
, &or_conn
->real_addr
);
2068 } else if (conn
->type
== CONN_TYPE_DIR
) {
2069 tor_addr_copy(&real_addr
, &conn
->addr
);
2072 /* Check if we broke a mandatory address family restriction */
2073 if ((must_ipv4
&& tor_addr_family(&real_addr
) == AF_INET6
)
2074 || (must_ipv6
&& tor_addr_family(&real_addr
) == AF_INET
)) {
2075 static int logged_backtrace
= 0;
2076 log_info(LD_BUG
, "Outgoing %s connection to %s violated ClientUseIPv%s 0.",
2077 conn
->type
== CONN_TYPE_OR
? "OR" : "Dir",
2078 fmt_addr(&real_addr
),
2079 options
->ClientUseIPv4
== 0 ? "4" : "6");
2080 if (!logged_backtrace
) {
2081 log_backtrace(LOG_INFO
, LD_BUG
, "Address came from");
2082 logged_backtrace
= 1;
2086 /* Bridges are allowed to break IPv4/IPv6 ORPort preferences to connect to
2087 * the node's configured address when ClientPreferIPv6ORPort is auto */
2088 if (options
->UseBridges
&& conn
->type
== CONN_TYPE_OR
2089 && options
->ClientPreferIPv6ORPort
== -1) {
2093 if (fascist_firewall_use_ipv6(options
)) {
2094 log_info(LD_NET
, "Our outgoing connection is using IPv%d.",
2095 tor_addr_family(&real_addr
) == AF_INET6
? 6 : 4);
2098 /* Check if we couldn't satisfy an address family preference */
2099 if ((!pref_ipv6
&& tor_addr_family(&real_addr
) == AF_INET6
)
2100 || (pref_ipv6
&& tor_addr_family(&real_addr
) == AF_INET
)) {
2101 log_info(LD_NET
, "Outgoing connection to %s doesn't satisfy "
2102 "ClientPreferIPv6%sPort %d, with ClientUseIPv4 %d, and "
2103 "fascist_firewall_use_ipv6 %d (ClientUseIPv6 %d and UseBridges "
2105 fmt_addr(&real_addr
),
2106 conn
->type
== CONN_TYPE_OR
? "OR" : "Dir",
2107 conn
->type
== CONN_TYPE_OR
? options
->ClientPreferIPv6ORPort
2108 : options
->ClientPreferIPv6DirPort
,
2109 options
->ClientUseIPv4
, fascist_firewall_use_ipv6(options
),
2110 options
->ClientUseIPv6
, options
->UseBridges
);
2114 /** Retrieve the outbound address depending on the protocol (IPv4 or IPv6)
2115 * and the connection type (relay, exit, ...)
2116 * Return a socket address or NULL in case nothing is configured.
2119 conn_get_outbound_address(sa_family_t family
,
2120 const or_options_t
*options
, unsigned int conn_type
)
2122 const tor_addr_t
*ext_addr
= NULL
;
2136 // If an exit connection, use the exit address (if present)
2137 if (conn_type
== CONN_TYPE_EXIT
) {
2138 if (!tor_addr_is_null(
2139 &options
->OutboundBindAddresses
[OUTBOUND_ADDR_EXIT
][fam_index
])) {
2140 ext_addr
= &options
->OutboundBindAddresses
[OUTBOUND_ADDR_EXIT
]
2142 } else if (!tor_addr_is_null(
2143 &options
->OutboundBindAddresses
[OUTBOUND_ADDR_EXIT_AND_OR
]
2145 ext_addr
= &options
->OutboundBindAddresses
[OUTBOUND_ADDR_EXIT_AND_OR
]
2148 } else { // All non-exit connections
2149 if (!tor_addr_is_null(
2150 &options
->OutboundBindAddresses
[OUTBOUND_ADDR_OR
][fam_index
])) {
2151 ext_addr
= &options
->OutboundBindAddresses
[OUTBOUND_ADDR_OR
]
2153 } else if (!tor_addr_is_null(
2154 &options
->OutboundBindAddresses
[OUTBOUND_ADDR_EXIT_AND_OR
]
2156 ext_addr
= &options
->OutboundBindAddresses
[OUTBOUND_ADDR_EXIT_AND_OR
]
2163 /** Take conn, make a nonblocking socket; try to connect to
2164 * addr:port (port arrives in *host order*). If fail, return -1 and if
2165 * applicable put your best guess about errno into *<b>socket_error</b>.
2166 * Else assign s to conn-\>s: if connected return 1, if EAGAIN return 0.
2168 * addr:port can be different to conn->addr:conn->port if connecting through
2171 * address is used to make the logs useful.
2173 * On success, add conn to the list of polled connections.
2176 connection_connect(connection_t
*conn
, const char *address
,
2177 const tor_addr_t
*addr
, uint16_t port
, int *socket_error
)
2179 struct sockaddr_storage addrbuf
;
2180 struct sockaddr_storage bind_addr_ss
;
2181 struct sockaddr
*bind_addr
= NULL
;
2182 struct sockaddr
*dest_addr
;
2183 int dest_addr_len
, bind_addr_len
= 0;
2185 /* Log if we didn't stick to ClientUseIPv4/6 or ClientPreferIPv6OR/DirPort
2187 connection_connect_log_client_use_ip_version(conn
);
2189 if (!tor_addr_is_loopback(addr
)) {
2190 const tor_addr_t
*ext_addr
= NULL
;
2191 ext_addr
= conn_get_outbound_address(tor_addr_family(addr
), get_options(),
2194 memset(&bind_addr_ss
, 0, sizeof(bind_addr_ss
));
2195 bind_addr_len
= tor_addr_to_sockaddr(ext_addr
, 0,
2196 (struct sockaddr
*) &bind_addr_ss
,
2197 sizeof(bind_addr_ss
));
2198 if (bind_addr_len
== 0) {
2200 "Error converting OutboundBindAddress %s into sockaddr. "
2201 "Ignoring.", fmt_and_decorate_addr(ext_addr
));
2203 bind_addr
= (struct sockaddr
*)&bind_addr_ss
;
2208 memset(&addrbuf
,0,sizeof(addrbuf
));
2209 dest_addr
= (struct sockaddr
*) &addrbuf
;
2210 dest_addr_len
= tor_addr_to_sockaddr(addr
, port
, dest_addr
, sizeof(addrbuf
));
2211 tor_assert(dest_addr_len
> 0);
2213 log_debug(LD_NET
, "Connecting to %s:%u.",
2214 escaped_safe_str_client(address
), port
);
2216 return connection_connect_sockaddr(conn
, dest_addr
, dest_addr_len
,
2217 bind_addr
, bind_addr_len
, socket_error
);
2220 #ifdef HAVE_SYS_UN_H
2222 /** Take conn, make a nonblocking socket; try to connect to
2223 * an AF_UNIX socket at socket_path. If fail, return -1 and if applicable
2224 * put your best guess about errno into *<b>socket_error</b>. Else assign s
2225 * to conn-\>s: if connected return 1, if EAGAIN return 0.
2227 * On success, add conn to the list of polled connections.
2230 connection_connect_unix(connection_t
*conn
, const char *socket_path
,
2233 struct sockaddr_un dest_addr
;
2235 tor_assert(socket_path
);
2237 /* Check that we'll be able to fit it into dest_addr later */
2238 if (strlen(socket_path
) + 1 > sizeof(dest_addr
.sun_path
)) {
2240 "Path %s is too long for an AF_UNIX socket\n",
2241 escaped_safe_str_client(socket_path
));
2242 *socket_error
= SOCK_ERRNO(ENAMETOOLONG
);
2246 memset(&dest_addr
, 0, sizeof(dest_addr
));
2247 dest_addr
.sun_family
= AF_UNIX
;
2248 strlcpy(dest_addr
.sun_path
, socket_path
, sizeof(dest_addr
.sun_path
));
2251 "Connecting to AF_UNIX socket at %s.",
2252 escaped_safe_str_client(socket_path
));
2254 return connection_connect_sockaddr(conn
,
2255 (struct sockaddr
*)&dest_addr
, sizeof(dest_addr
),
2256 NULL
, 0, socket_error
);
2259 #endif /* defined(HAVE_SYS_UN_H) */
2261 /** Convert state number to string representation for logging purposes.
2264 connection_proxy_state_to_string(int state
)
2266 static const char *unknown
= "???";
2267 static const char *states
[] = {
2270 "PROXY_HTTPS_WANT_CONNECT_OK",
2271 "PROXY_SOCKS4_WANT_CONNECT_OK",
2272 "PROXY_SOCKS5_WANT_AUTH_METHOD_NONE",
2273 "PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929",
2274 "PROXY_SOCKS5_WANT_AUTH_RFC1929_OK",
2275 "PROXY_SOCKS5_WANT_CONNECT_OK",
2279 if (state
< PROXY_NONE
|| state
> PROXY_CONNECTED
)
2282 return states
[state
];
2285 /** Returns the global proxy type used by tor. Use this function for
2286 * logging or high-level purposes, don't use it to fill the
2287 * <b>proxy_type</b> field of or_connection_t; use the actual proxy
2288 * protocol instead.*/
2290 get_proxy_type(void)
2292 const or_options_t
*options
= get_options();
2294 if (options
->ClientTransportPlugin
)
2295 return PROXY_PLUGGABLE
;
2296 else if (options
->HTTPSProxy
)
2297 return PROXY_CONNECT
;
2298 else if (options
->Socks4Proxy
)
2299 return PROXY_SOCKS4
;
2300 else if (options
->Socks5Proxy
)
2301 return PROXY_SOCKS5
;
2306 /* One byte for the version, one for the command, two for the
2307 port, and four for the addr... and, one more for the
2309 #define SOCKS4_STANDARD_BUFFER_SIZE (1 + 1 + 2 + 4 + 1)
2311 /** Write a proxy request of <b>type</b> (socks4, socks5, https) to conn
2312 * for conn->addr:conn->port, authenticating with the auth details given
2313 * in the configuration (if available). SOCKS 5 and HTTP CONNECT proxies
2314 * support authentication.
2316 * Returns -1 if conn->addr is incompatible with the proxy protocol, and
2319 * Use connection_read_proxy_handshake() to complete the handshake.
2322 connection_proxy_connect(connection_t
*conn
, int type
)
2324 const or_options_t
*options
;
2328 options
= get_options();
2331 case PROXY_CONNECT
: {
2333 char *base64_authenticator
=NULL
;
2334 const char *authenticator
= options
->HTTPSProxyAuthenticator
;
2336 /* Send HTTP CONNECT and authentication (if available) in
2339 if (authenticator
) {
2340 base64_authenticator
= alloc_http_authenticator(authenticator
);
2341 if (!base64_authenticator
)
2342 log_warn(LD_OR
, "Encoding https authenticator failed");
2345 if (base64_authenticator
) {
2346 const char *addrport
= fmt_addrport(&conn
->addr
, conn
->port
);
2347 tor_snprintf(buf
, sizeof(buf
), "CONNECT %s HTTP/1.1\r\n"
2349 "Proxy-Authorization: Basic %s\r\n\r\n",
2352 base64_authenticator
);
2353 tor_free(base64_authenticator
);
2355 tor_snprintf(buf
, sizeof(buf
), "CONNECT %s HTTP/1.0\r\n\r\n",
2356 fmt_addrport(&conn
->addr
, conn
->port
));
2359 connection_buf_add(buf
, strlen(buf
), conn
);
2360 conn
->proxy_state
= PROXY_HTTPS_WANT_CONNECT_OK
;
2364 case PROXY_SOCKS4
: {
2368 size_t buf_size
= 0;
2369 char *socks_args_string
= NULL
;
2371 /* Send a SOCKS4 connect request */
2373 if (tor_addr_family(&conn
->addr
) != AF_INET
) {
2374 log_warn(LD_NET
, "SOCKS4 client is incompatible with IPv6");
2378 { /* If we are here because we are trying to connect to a
2379 pluggable transport proxy, check if we have any SOCKS
2380 arguments to transmit. If we do, compress all arguments to
2381 a single string in 'socks_args_string': */
2383 if (get_proxy_type() == PROXY_PLUGGABLE
) {
2385 pt_get_socks_args_for_proxy_addrport(&conn
->addr
, conn
->port
);
2386 if (socks_args_string
)
2387 log_debug(LD_NET
, "Sending out '%s' as our SOCKS argument string.",
2392 { /* Figure out the buffer size we need for the SOCKS message: */
2394 buf_size
= SOCKS4_STANDARD_BUFFER_SIZE
;
2396 /* If we have a SOCKS argument string, consider its size when
2397 calculating the buffer size: */
2398 if (socks_args_string
)
2399 buf_size
+= strlen(socks_args_string
);
2402 buf
= tor_malloc_zero(buf_size
);
2404 ip4addr
= tor_addr_to_ipv4n(&conn
->addr
);
2405 portn
= htons(conn
->port
);
2407 buf
[0] = 4; /* version */
2408 buf
[1] = SOCKS_COMMAND_CONNECT
; /* command */
2409 memcpy(buf
+ 2, &portn
, 2); /* port */
2410 memcpy(buf
+ 4, &ip4addr
, 4); /* addr */
2412 /* Next packet field is the userid. If we have pluggable
2413 transport SOCKS arguments, we have to embed them
2414 there. Otherwise, we use an empty userid. */
2415 if (socks_args_string
) { /* place the SOCKS args string: */
2416 tor_assert(strlen(socks_args_string
) > 0);
2417 tor_assert(buf_size
>=
2418 SOCKS4_STANDARD_BUFFER_SIZE
+ strlen(socks_args_string
));
2419 strlcpy((char *)buf
+ 8, socks_args_string
, buf_size
- 8);
2420 tor_free(socks_args_string
);
2422 buf
[8] = 0; /* no userid */
2425 connection_buf_add((char *)buf
, buf_size
, conn
);
2428 conn
->proxy_state
= PROXY_SOCKS4_WANT_CONNECT_OK
;
2432 case PROXY_SOCKS5
: {
2433 unsigned char buf
[4]; /* fields: vers, num methods, method list */
2435 /* Send a SOCKS5 greeting (connect request must wait) */
2437 buf
[0] = 5; /* version */
2439 /* We have to use SOCKS5 authentication, if we have a
2440 Socks5ProxyUsername or if we want to pass arguments to our
2441 pluggable transport proxy: */
2442 if ((options
->Socks5ProxyUsername
) ||
2443 (get_proxy_type() == PROXY_PLUGGABLE
&&
2444 (get_socks_args_by_bridge_addrport(&conn
->addr
, conn
->port
)))) {
2445 /* number of auth methods */
2447 buf
[2] = 0x00; /* no authentication */
2448 buf
[3] = 0x02; /* rfc1929 Username/Passwd auth */
2449 conn
->proxy_state
= PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929
;
2452 buf
[2] = 0x00; /* no authentication */
2453 conn
->proxy_state
= PROXY_SOCKS5_WANT_AUTH_METHOD_NONE
;
2456 connection_buf_add((char *)buf
, 2 + buf
[1], conn
);
2461 log_err(LD_BUG
, "Invalid proxy protocol, %d", type
);
2462 tor_fragile_assert();
2466 log_debug(LD_NET
, "set state %s",
2467 connection_proxy_state_to_string(conn
->proxy_state
));
2472 /** Read conn's inbuf. If the http response from the proxy is all
2473 * here, make sure it's good news, then return 1. If it's bad news,
2474 * return -1. Else return 0 and hope for better luck next time.
2477 connection_read_https_proxy_response(connection_t
*conn
)
2484 switch (fetch_from_buf_http(conn
->inbuf
,
2485 &headers
, MAX_HEADERS_SIZE
,
2486 NULL
, NULL
, 10000, 0)) {
2487 case -1: /* overflow */
2488 log_warn(LD_PROTOCOL
,
2489 "Your https proxy sent back an oversized response. Closing.");
2492 log_info(LD_NET
,"https proxy response not all here yet. Waiting.");
2494 /* case 1, fall through */
2497 if (parse_http_response(headers
, &status_code
, &date_header
,
2498 NULL
, &reason
) < 0) {
2500 "Unparseable headers from proxy (connecting to '%s'). Closing.",
2506 if (!reason
) reason
= tor_strdup("[no reason given]");
2508 if (status_code
== 200) {
2510 "HTTPS connect to '%s' successful! (200 %s) Starting TLS.",
2511 conn
->address
, escaped(reason
));
2515 /* else, bad news on the status code */
2516 switch (status_code
) {
2519 "The https proxy refused to allow connection to %s "
2520 "(status code %d, %s). Closing.",
2521 conn
->address
, status_code
, escaped(reason
));
2525 "The https proxy sent back an unexpected status code %d (%s). "
2527 status_code
, escaped(reason
));
2534 /** Send SOCKS5 CONNECT command to <b>conn</b>, copying <b>conn->addr</b>
2535 * and <b>conn->port</b> into the request.
2538 connection_send_socks5_connect(connection_t
*conn
)
2540 unsigned char buf
[1024];
2542 uint16_t port
= htons(conn
->port
);
2544 buf
[0] = 5; /* version */
2545 buf
[1] = SOCKS_COMMAND_CONNECT
; /* command */
2546 buf
[2] = 0; /* reserved */
2548 if (tor_addr_family(&conn
->addr
) == AF_INET
) {
2549 uint32_t addr
= tor_addr_to_ipv4n(&conn
->addr
);
2553 memcpy(buf
+ 4, &addr
, 4);
2554 memcpy(buf
+ 8, &port
, 2);
2555 } else { /* AF_INET6 */
2558 memcpy(buf
+ 4, tor_addr_to_in6_addr8(&conn
->addr
), 16);
2559 memcpy(buf
+ 20, &port
, 2);
2562 connection_buf_add((char *)buf
, reqsize
, conn
);
2564 conn
->proxy_state
= PROXY_SOCKS5_WANT_CONNECT_OK
;
2567 /** Wrapper around fetch_from_buf_socks_client: see that functions
2568 * for documentation of its behavior. */
2570 connection_fetch_from_buf_socks_client(connection_t
*conn
,
2571 int state
, char **reason
)
2573 return fetch_from_buf_socks_client(conn
->inbuf
, state
, reason
);
2576 /** Call this from connection_*_process_inbuf() to advance the proxy
2579 * No matter what proxy protocol is used, if this function returns 1, the
2580 * handshake is complete, and the data remaining on inbuf may contain the
2581 * start of the communication with the requested server.
2583 * Returns 0 if the current buffer contains an incomplete response, and -1
2587 connection_read_proxy_handshake(connection_t
*conn
)
2590 char *reason
= NULL
;
2592 log_debug(LD_NET
, "enter state %s",
2593 connection_proxy_state_to_string(conn
->proxy_state
));
2595 switch (conn
->proxy_state
) {
2596 case PROXY_HTTPS_WANT_CONNECT_OK
:
2597 ret
= connection_read_https_proxy_response(conn
);
2599 conn
->proxy_state
= PROXY_CONNECTED
;
2602 case PROXY_SOCKS4_WANT_CONNECT_OK
:
2603 ret
= connection_fetch_from_buf_socks_client(conn
,
2607 conn
->proxy_state
= PROXY_CONNECTED
;
2610 case PROXY_SOCKS5_WANT_AUTH_METHOD_NONE
:
2611 ret
= connection_fetch_from_buf_socks_client(conn
,
2614 /* no auth needed, do connect */
2616 connection_send_socks5_connect(conn
);
2621 case PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929
:
2622 ret
= connection_fetch_from_buf_socks_client(conn
,
2626 /* send auth if needed, otherwise do connect */
2628 connection_send_socks5_connect(conn
);
2630 } else if (ret
== 2) {
2631 unsigned char buf
[1024];
2632 size_t reqsize
, usize
, psize
;
2633 const char *user
, *pass
;
2634 char *socks_args_string
= NULL
;
2636 if (get_proxy_type() == PROXY_PLUGGABLE
) {
2638 pt_get_socks_args_for_proxy_addrport(&conn
->addr
, conn
->port
);
2639 if (!socks_args_string
) {
2640 log_warn(LD_NET
, "Could not create SOCKS args string.");
2645 log_debug(LD_NET
, "SOCKS5 arguments: %s", socks_args_string
);
2646 tor_assert(strlen(socks_args_string
) > 0);
2647 tor_assert(strlen(socks_args_string
) <= MAX_SOCKS5_AUTH_SIZE_TOTAL
);
2649 if (strlen(socks_args_string
) > MAX_SOCKS5_AUTH_FIELD_SIZE
) {
2650 user
= socks_args_string
;
2651 usize
= MAX_SOCKS5_AUTH_FIELD_SIZE
;
2652 pass
= socks_args_string
+ MAX_SOCKS5_AUTH_FIELD_SIZE
;
2653 psize
= strlen(socks_args_string
) - MAX_SOCKS5_AUTH_FIELD_SIZE
;
2655 user
= socks_args_string
;
2656 usize
= strlen(socks_args_string
);
2660 } else if (get_options()->Socks5ProxyUsername
) {
2661 user
= get_options()->Socks5ProxyUsername
;
2662 pass
= get_options()->Socks5ProxyPassword
;
2663 tor_assert(user
&& pass
);
2664 usize
= strlen(user
);
2665 psize
= strlen(pass
);
2667 log_err(LD_BUG
, "We entered %s for no reason!", __func__
);
2668 tor_fragile_assert();
2673 /* Username and password lengths should have been checked
2674 above and during torrc parsing. */
2675 tor_assert(usize
<= MAX_SOCKS5_AUTH_FIELD_SIZE
&&
2676 psize
<= MAX_SOCKS5_AUTH_FIELD_SIZE
);
2677 reqsize
= 3 + usize
+ psize
;
2679 buf
[0] = 1; /* negotiation version */
2681 memcpy(buf
+ 2, user
, usize
);
2682 buf
[2 + usize
] = psize
;
2683 memcpy(buf
+ 3 + usize
, pass
, psize
);
2685 if (socks_args_string
)
2686 tor_free(socks_args_string
);
2688 connection_buf_add((char *)buf
, reqsize
, conn
);
2690 conn
->proxy_state
= PROXY_SOCKS5_WANT_AUTH_RFC1929_OK
;
2695 case PROXY_SOCKS5_WANT_AUTH_RFC1929_OK
:
2696 ret
= connection_fetch_from_buf_socks_client(conn
,
2699 /* send the connect request */
2701 connection_send_socks5_connect(conn
);
2706 case PROXY_SOCKS5_WANT_CONNECT_OK
:
2707 ret
= connection_fetch_from_buf_socks_client(conn
,
2711 conn
->proxy_state
= PROXY_CONNECTED
;
2715 log_err(LD_BUG
, "Invalid proxy_state for reading, %d",
2717 tor_fragile_assert();
2722 log_debug(LD_NET
, "leaving state %s",
2723 connection_proxy_state_to_string(conn
->proxy_state
));
2727 log_warn(LD_NET
, "Proxy Client: unable to connect to %s:%d (%s)",
2728 conn
->address
, conn
->port
, escaped(reason
));
2731 log_warn(LD_NET
, "Proxy Client: unable to connect to %s:%d",
2732 conn
->address
, conn
->port
);
2734 } else if (ret
== 1) {
2735 log_info(LD_NET
, "Proxy Client: connection to %s:%d successful",
2736 conn
->address
, conn
->port
);
2742 /** Given a list of listener connections in <b>old_conns</b>, and list of
2743 * port_cfg_t entries in <b>ports</b>, open a new listener for every port in
2744 * <b>ports</b> that does not already have a listener in <b>old_conns</b>.
2746 * Remove from <b>old_conns</b> every connection that has a corresponding
2747 * entry in <b>ports</b>. Add to <b>new_conns</b> new every connection we
2748 * launch. If we may need to perform socket rebind when creating new
2749 * listener that replaces old one, create a <b>listener_replacement_t</b>
2750 * struct for affected pair and add it to <b>replacements</b>.
2752 * If <b>control_listeners_only</b> is true, then we only open control
2753 * listeners, and we do not remove any noncontrol listeners from
2756 * Return 0 on success, -1 on failure.
2759 retry_listener_ports(smartlist_t
*old_conns
,
2760 const smartlist_t
*ports
,
2761 smartlist_t
*new_conns
,
2762 smartlist_t
*replacements
,
2763 int control_listeners_only
)
2765 #ifndef ENABLE_LISTENER_REBIND
2769 smartlist_t
*launch
= smartlist_new();
2772 if (control_listeners_only
) {
2773 SMARTLIST_FOREACH(ports
, port_cfg_t
*, p
, {
2774 if (p
->type
== CONN_TYPE_CONTROL_LISTENER
)
2775 smartlist_add(launch
, p
);
2778 smartlist_add_all(launch
, ports
);
2781 /* Iterate through old_conns, comparing it to launch: remove from both lists
2782 * each pair of elements that corresponds to the same port. */
2783 SMARTLIST_FOREACH_BEGIN(old_conns
, connection_t
*, conn
) {
2784 const port_cfg_t
*found_port
= NULL
;
2786 /* Okay, so this is a listener. Is it configured? */
2787 /* That is, is it either: 1) exact match - address and port
2788 * pair match exactly between old listener and new port; or 2)
2789 * wildcard match - port matches exactly, but *one* of the
2790 * addresses is wildcard (0.0.0.0 or ::)?
2792 SMARTLIST_FOREACH_BEGIN(launch
, const port_cfg_t
*, wanted
) {
2793 if (conn
->type
!= wanted
->type
)
2795 if ((conn
->socket_family
!= AF_UNIX
&& wanted
->is_unix_addr
) ||
2796 (conn
->socket_family
== AF_UNIX
&& ! wanted
->is_unix_addr
))
2799 if (wanted
->server_cfg
.no_listen
)
2800 continue; /* We don't want to open a listener for this one */
2802 if (wanted
->is_unix_addr
) {
2803 if (conn
->socket_family
== AF_UNIX
&&
2804 !strcmp(wanted
->unix_addr
, conn
->address
)) {
2805 found_port
= wanted
;
2809 /* Numeric values of old and new port match exactly. */
2810 const int port_matches_exact
= (wanted
->port
== conn
->port
);
2811 /* Ports match semantically - either their specific values
2812 match exactly, or new port is 'auto'.
2814 const int port_matches
= (wanted
->port
== CFG_AUTO_PORT
||
2815 port_matches_exact
);
2817 if (port_matches
&& tor_addr_eq(&wanted
->addr
, &conn
->addr
)) {
2818 found_port
= wanted
;
2821 #ifdef ENABLE_LISTENER_REBIND
2822 /* Rebinding may be needed if all of the following are true:
2823 * 1) Address family is the same in old and new listeners.
2824 * 2) Port number matches exactly (numeric value is the same).
2825 * 3) *One* of listeners (either old one or new one) has a
2826 * wildcard IP address (0.0.0.0 or [::]).
2828 * These are the exact conditions for a first bind() syscall
2829 * to fail with EADDRINUSE.
2831 const int may_need_rebind
=
2832 tor_addr_family(&wanted
->addr
) == tor_addr_family(&conn
->addr
) &&
2833 port_matches_exact
&& bool_neq(tor_addr_is_null(&wanted
->addr
),
2834 tor_addr_is_null(&conn
->addr
));
2835 if (replacements
&& may_need_rebind
) {
2836 listener_replacement_t
*replacement
=
2837 tor_malloc(sizeof(listener_replacement_t
));
2839 replacement
->old_conn
= conn
;
2840 replacement
->new_port
= wanted
;
2841 smartlist_add(replacements
, replacement
);
2843 SMARTLIST_DEL_CURRENT(launch
, wanted
);
2844 SMARTLIST_DEL_CURRENT(old_conns
, conn
);
2849 } SMARTLIST_FOREACH_END(wanted
);
2852 /* This listener is already running; we don't need to launch it. */
2853 //log_debug(LD_NET, "Already have %s on %s:%d",
2854 // conn_type_to_string(found_port->type), conn->address, conn->port);
2855 smartlist_remove(launch
, found_port
);
2856 /* And we can remove the connection from old_conns too. */
2857 SMARTLIST_DEL_CURRENT(old_conns
, conn
);
2859 } SMARTLIST_FOREACH_END(conn
);
2861 /* Now open all the listeners that are configured but not opened. */
2862 SMARTLIST_FOREACH_BEGIN(launch
, const port_cfg_t
*, port
) {
2864 connection_t
*conn
= connection_listener_new_for_port(port
, &skip
, NULL
);
2866 if (conn
&& new_conns
)
2867 smartlist_add(new_conns
, conn
);
2870 } SMARTLIST_FOREACH_END(port
);
2872 smartlist_free(launch
);
2877 /** Launch listeners for each port you should have open. Only launch
2878 * listeners who are not already open, and only close listeners we no longer
2881 * Add all new connections to <b>new_conns</b>.
2883 * If <b>close_all_noncontrol</b> is true, then we only open control
2884 * listeners, and we close all other listeners.
2887 retry_all_listeners(smartlist_t
*new_conns
, int close_all_noncontrol
)
2889 smartlist_t
*listeners
= smartlist_new();
2890 smartlist_t
*replacements
= smartlist_new();
2891 const or_options_t
*options
= get_options();
2893 const uint16_t old_or_port
= router_get_advertised_or_port(options
);
2894 const uint16_t old_or_port_ipv6
=
2895 router_get_advertised_or_port_by_af(options
,AF_INET6
);
2896 const uint16_t old_dir_port
= router_get_advertised_dir_port(options
, 0);
2898 SMARTLIST_FOREACH_BEGIN(get_connection_array(), connection_t
*, conn
) {
2899 if (connection_is_listener(conn
) && !conn
->marked_for_close
)
2900 smartlist_add(listeners
, conn
);
2901 } SMARTLIST_FOREACH_END(conn
);
2903 if (retry_listener_ports(listeners
,
2904 get_configured_ports(),
2907 close_all_noncontrol
) < 0)
2910 #ifdef ENABLE_LISTENER_REBIND
2911 if (smartlist_len(replacements
))
2912 log_debug(LD_NET
, "%d replacements - starting rebinding loop.",
2913 smartlist_len(replacements
));
2915 SMARTLIST_FOREACH_BEGIN(replacements
, listener_replacement_t
*, r
) {
2916 int addr_in_use
= 0;
2919 tor_assert(r
->new_port
);
2920 tor_assert(r
->old_conn
);
2922 connection_t
*new_conn
=
2923 connection_listener_new_for_port(r
->new_port
, &skip
, &addr_in_use
);
2924 connection_t
*old_conn
= r
->old_conn
;
2927 log_debug(LD_NET
, "Skipping creating new listener for %s:%d",
2928 old_conn
->address
, old_conn
->port
);
2932 connection_close_immediate(old_conn
);
2933 connection_mark_for_close(old_conn
);
2936 new_conn
= connection_listener_new_for_port(r
->new_port
,
2937 &skip
, &addr_in_use
);
2940 tor_assert(new_conn
);
2942 smartlist_add(new_conns
, new_conn
);
2944 log_notice(LD_NET
, "Closed no-longer-configured %s on %s:%d "
2945 "(replaced by %s:%d)",
2946 conn_type_to_string(old_conn
->type
), old_conn
->address
,
2947 old_conn
->port
, new_conn
->address
, new_conn
->port
);
2948 } SMARTLIST_FOREACH_END(r
);
2951 /* Any members that were still in 'listeners' don't correspond to
2952 * any configured port. Kill 'em. */
2953 SMARTLIST_FOREACH_BEGIN(listeners
, connection_t
*, conn
) {
2954 log_notice(LD_NET
, "Closing no-longer-configured %s on %s:%d",
2955 conn_type_to_string(conn
->type
), conn
->address
, conn
->port
);
2956 connection_close_immediate(conn
);
2957 connection_mark_for_close(conn
);
2958 } SMARTLIST_FOREACH_END(conn
);
2960 smartlist_free(listeners
);
2961 /* Cleanup any remaining listener replacement. */
2962 SMARTLIST_FOREACH(replacements
, listener_replacement_t
*, r
, tor_free(r
));
2963 smartlist_free(replacements
);
2965 if (old_or_port
!= router_get_advertised_or_port(options
) ||
2966 old_or_port_ipv6
!= router_get_advertised_or_port_by_af(options
,
2968 old_dir_port
!= router_get_advertised_dir_port(options
, 0)) {
2969 /* Our chosen ORPort or DirPort is not what it used to be: the
2970 * descriptor we had (if any) should be regenerated. (We won't
2971 * automatically notice this because of changes in the option,
2972 * since the value could be "auto".) */
2973 mark_my_descriptor_dirty("Chosen Or/DirPort changed");
2979 /** Mark every listener of type other than CONTROL_LISTENER to be closed. */
2981 connection_mark_all_noncontrol_listeners(void)
2983 SMARTLIST_FOREACH_BEGIN(get_connection_array(), connection_t
*, conn
) {
2984 if (conn
->marked_for_close
)
2986 if (conn
->type
== CONN_TYPE_CONTROL_LISTENER
)
2988 if (connection_is_listener(conn
))
2989 connection_mark_for_close(conn
);
2990 } SMARTLIST_FOREACH_END(conn
);
2993 /** Mark every external connection not used for controllers for close. */
2995 connection_mark_all_noncontrol_connections(void)
2997 SMARTLIST_FOREACH_BEGIN(get_connection_array(), connection_t
*, conn
) {
2998 if (conn
->marked_for_close
)
3000 switch (conn
->type
) {
3001 case CONN_TYPE_CONTROL_LISTENER
:
3002 case CONN_TYPE_CONTROL
:
3005 connection_mark_unattached_ap(TO_ENTRY_CONN(conn
),
3006 END_STREAM_REASON_HIBERNATING
);
3010 or_connection_t
*orconn
= TO_OR_CONN(conn
);
3012 connection_or_close_normally(orconn
, 0);
3015 * There should have been one, but mark for close and hope
3018 connection_mark_for_close(conn
);
3023 connection_mark_for_close(conn
);
3026 } SMARTLIST_FOREACH_END(conn
);
3029 /** Return 1 if we should apply rate limiting to <b>conn</b>, and 0
3031 * Right now this just checks if it's an internal IP address or an
3032 * internal connection. We also should, but don't, check if the connection
3033 * uses pluggable transports, since we should then limit it even if it
3034 * comes from an internal IP address. */
3036 connection_is_rate_limited(connection_t
*conn
)
3038 const or_options_t
*options
= get_options();
3040 return 0; /* Internal connection */
3041 else if (! options
->CountPrivateBandwidth
&&
3042 (tor_addr_family(&conn
->addr
) == AF_UNSPEC
|| /* no address */
3043 tor_addr_family(&conn
->addr
) == AF_UNIX
|| /* no address */
3044 tor_addr_is_internal(&conn
->addr
, 0)))
3045 return 0; /* Internal address */
3050 /** When was either global write bucket last empty? If this was recent, then
3051 * we're probably low on bandwidth, and we should be stingy with our bandwidth
3053 static time_t write_buckets_last_empty_at
= -100;
3055 /** How many seconds of no active local circuits will make the
3056 * connection revert to the "relayed" bandwidth class? */
3057 #define CLIENT_IDLE_TIME_FOR_PRIORITY 30
3059 /** Return 1 if <b>conn</b> should use tokens from the "relayed"
3060 * bandwidth rates, else 0. Currently, only OR conns with bandwidth
3061 * class 1, and directory conns that are serving data out, count.
3064 connection_counts_as_relayed_traffic(connection_t
*conn
, time_t now
)
3066 if (conn
->type
== CONN_TYPE_OR
&&
3067 connection_or_client_used(TO_OR_CONN(conn
)) +
3068 CLIENT_IDLE_TIME_FOR_PRIORITY
< now
)
3070 if (conn
->type
== CONN_TYPE_DIR
&& DIR_CONN_IS_SERVER(conn
))
3075 /** Helper function to decide how many bytes out of <b>global_bucket</b>
3076 * we're willing to use for this transaction. <b>base</b> is the size
3077 * of a cell on the network; <b>priority</b> says whether we should
3078 * write many of them or just a few; and <b>conn_bucket</b> (if
3079 * non-negative) provides an upper limit for our answer. */
3081 connection_bucket_get_share(int base
, int priority
,
3082 ssize_t global_bucket_val
, ssize_t conn_bucket
)
3085 ssize_t num_bytes_high
= (priority
? 32 : 16) * base
;
3086 ssize_t num_bytes_low
= (priority
? 4 : 2) * base
;
3088 /* Do a rudimentary limiting so one circuit can't hog a connection.
3089 * Pick at most 32 cells, at least 4 cells if possible, and if we're in
3090 * the middle pick 1/8 of the available bandwidth. */
3091 at_most
= global_bucket_val
/ 8;
3092 at_most
-= (at_most
% base
); /* round down */
3093 if (at_most
> num_bytes_high
) /* 16 KB, or 8 KB for low-priority */
3094 at_most
= num_bytes_high
;
3095 else if (at_most
< num_bytes_low
) /* 2 KB, or 1 KB for low-priority */
3096 at_most
= num_bytes_low
;
3098 if (at_most
> global_bucket_val
)
3099 at_most
= global_bucket_val
;
3101 if (conn_bucket
>= 0 && at_most
> conn_bucket
)
3102 at_most
= conn_bucket
;
3109 /** How many bytes at most can we read onto this connection? */
3111 connection_bucket_read_limit(connection_t
*conn
, time_t now
)
3113 int base
= RELAY_PAYLOAD_SIZE
;
3114 int priority
= conn
->type
!= CONN_TYPE_DIR
;
3115 ssize_t conn_bucket
= -1;
3116 size_t global_bucket_val
= token_bucket_rw_get_read(&global_bucket
);
3118 if (connection_speaks_cells(conn
)) {
3119 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
3120 if (conn
->state
== OR_CONN_STATE_OPEN
)
3121 conn_bucket
= token_bucket_rw_get_read(&or_conn
->bucket
);
3122 base
= get_cell_network_size(or_conn
->wide_circ_ids
);
3125 if (!connection_is_rate_limited(conn
)) {
3126 /* be willing to read on local conns even if our buckets are empty */
3127 return conn_bucket
>=0 ? conn_bucket
: 1<<14;
3130 if (connection_counts_as_relayed_traffic(conn
, now
)) {
3131 size_t relayed
= token_bucket_rw_get_read(&global_relayed_bucket
);
3132 global_bucket_val
= MIN(global_bucket_val
, relayed
);
3135 return connection_bucket_get_share(base
, priority
,
3136 global_bucket_val
, conn_bucket
);
3139 /** How many bytes at most can we write onto this connection? */
3141 connection_bucket_write_limit(connection_t
*conn
, time_t now
)
3143 int base
= RELAY_PAYLOAD_SIZE
;
3144 int priority
= conn
->type
!= CONN_TYPE_DIR
;
3145 size_t conn_bucket
= conn
->outbuf_flushlen
;
3146 size_t global_bucket_val
= token_bucket_rw_get_write(&global_bucket
);
3148 if (!connection_is_rate_limited(conn
)) {
3149 /* be willing to write to local conns even if our buckets are empty */
3150 return conn
->outbuf_flushlen
;
3153 if (connection_speaks_cells(conn
)) {
3154 /* use the per-conn write limit if it's lower */
3155 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
3156 if (conn
->state
== OR_CONN_STATE_OPEN
)
3157 conn_bucket
= MIN(conn_bucket
,
3158 token_bucket_rw_get_write(&or_conn
->bucket
));
3159 base
= get_cell_network_size(or_conn
->wide_circ_ids
);
3162 if (connection_counts_as_relayed_traffic(conn
, now
)) {
3163 size_t relayed
= token_bucket_rw_get_write(&global_relayed_bucket
);
3164 global_bucket_val
= MIN(global_bucket_val
, relayed
);
3167 return connection_bucket_get_share(base
, priority
,
3168 global_bucket_val
, conn_bucket
);
3171 /** Return 1 if the global write buckets are low enough that we
3172 * shouldn't send <b>attempt</b> bytes of low-priority directory stuff
3173 * out to <b>conn</b>. Else return 0.
3175 * Priority was 1 for v1 requests (directories and running-routers),
3176 * and 2 for v2 requests and later (statuses and descriptors).
3178 * There are a lot of parameters we could use here:
3179 * - global_relayed_write_bucket. Low is bad.
3180 * - global_write_bucket. Low is bad.
3181 * - bandwidthrate. Low is bad.
3182 * - bandwidthburst. Not a big factor?
3183 * - attempt. High is bad.
3184 * - total bytes queued on outbufs. High is bad. But I'm wary of
3185 * using this, since a few slow-flushing queues will pump up the
3186 * number without meaning what we meant to mean. What we really
3187 * mean is "total directory bytes added to outbufs recently", but
3188 * that's harder to quantify and harder to keep track of.
3191 global_write_bucket_low(connection_t
*conn
, size_t attempt
, int priority
)
3193 size_t smaller_bucket
=
3194 MIN(token_bucket_rw_get_write(&global_bucket
),
3195 token_bucket_rw_get_write(&global_relayed_bucket
));
3196 if (authdir_mode(get_options()) && priority
>1)
3197 return 0; /* there's always room to answer v2 if we're an auth dir */
3199 if (!connection_is_rate_limited(conn
))
3200 return 0; /* local conns don't get limited */
3202 if (smaller_bucket
< attempt
)
3203 return 1; /* not enough space no matter the priority */
3206 const time_t diff
= approx_time() - write_buckets_last_empty_at
;
3208 return 1; /* we're already hitting our limits, no more please */
3211 if (priority
== 1) { /* old-style v1 query */
3212 /* Could we handle *two* of these requests within the next two seconds? */
3213 const or_options_t
*options
= get_options();
3214 size_t can_write
= (size_t) (smaller_bucket
3215 + 2*(options
->RelayBandwidthRate
? options
->RelayBandwidthRate
:
3216 options
->BandwidthRate
));
3217 if (can_write
< 2*attempt
)
3219 } else { /* v2 query */
3220 /* no further constraints yet */
3225 /** When did we last tell the accounting subsystem about transmitted
3227 static time_t last_recorded_accounting_at
= 0;
3229 /** Helper: adjusts our bandwidth history and informs the controller as
3230 * appropriate, given that we have just read <b>num_read</b> bytes and written
3231 * <b>num_written</b> bytes on <b>conn</b>. */
3233 record_num_bytes_transferred_impl(connection_t
*conn
,
3234 time_t now
, size_t num_read
, size_t num_written
)
3236 /* Count bytes of answering direct and tunneled directory requests */
3237 if (conn
->type
== CONN_TYPE_DIR
&& conn
->purpose
== DIR_PURPOSE_SERVER
) {
3239 rep_hist_note_dir_bytes_read(num_read
, now
);
3240 if (num_written
> 0)
3241 rep_hist_note_dir_bytes_written(num_written
, now
);
3244 if (!connection_is_rate_limited(conn
))
3245 return; /* local IPs are free */
3247 if (conn
->type
== CONN_TYPE_OR
)
3248 rep_hist_note_or_conn_bytes(conn
->global_identifier
, num_read
,
3252 rep_hist_note_bytes_read(num_read
, now
);
3254 if (num_written
> 0) {
3255 rep_hist_note_bytes_written(num_written
, now
);
3257 if (conn
->type
== CONN_TYPE_EXIT
)
3258 rep_hist_note_exit_bytes(conn
->port
, num_written
, num_read
);
3260 /* Remember these bytes towards statistics. */
3261 stats_increment_bytes_read_and_written(num_read
, num_written
);
3263 /* Remember these bytes towards accounting. */
3264 if (accounting_is_enabled(get_options())) {
3265 if (now
> last_recorded_accounting_at
&& last_recorded_accounting_at
) {
3266 accounting_add_bytes(num_read
, num_written
,
3267 (int)(now
- last_recorded_accounting_at
));
3269 accounting_add_bytes(num_read
, num_written
, 0);
3271 last_recorded_accounting_at
= now
;
3275 /** We just read <b>num_read</b> and wrote <b>num_written</b> bytes
3276 * onto <b>conn</b>. Decrement buckets appropriately. */
3278 connection_buckets_decrement(connection_t
*conn
, time_t now
,
3279 size_t num_read
, size_t num_written
)
3281 if (num_written
>= INT_MAX
|| num_read
>= INT_MAX
) {
3282 log_err(LD_BUG
, "Value out of range. num_read=%lu, num_written=%lu, "
3283 "connection type=%s, state=%s",
3284 (unsigned long)num_read
, (unsigned long)num_written
,
3285 conn_type_to_string(conn
->type
),
3286 conn_state_to_string(conn
->type
, conn
->state
));
3287 tor_assert_nonfatal_unreached();
3288 if (num_written
>= INT_MAX
)
3290 if (num_read
>= INT_MAX
)
3294 record_num_bytes_transferred_impl(conn
, now
, num_read
, num_written
);
3296 if (!connection_is_rate_limited(conn
))
3297 return; /* local IPs are free */
3300 if (connection_counts_as_relayed_traffic(conn
, now
)) {
3301 flags
= token_bucket_rw_dec(&global_relayed_bucket
, num_read
, num_written
);
3303 flags
|= token_bucket_rw_dec(&global_bucket
, num_read
, num_written
);
3305 if (flags
& TB_WRITE
) {
3306 write_buckets_last_empty_at
= now
;
3308 if (connection_speaks_cells(conn
) && conn
->state
== OR_CONN_STATE_OPEN
) {
3309 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
3310 token_bucket_rw_dec(&or_conn
->bucket
, num_read
, num_written
);
3315 * Mark <b>conn</b> as needing to stop reading because bandwidth has been
3316 * exhausted. If <b>is_global_bw</b>, it is closing because global bandwidth
3317 * limit has been exhausted. Otherwise, it is closing because its own
3318 * bandwidth limit has been exhausted.
3321 connection_read_bw_exhausted(connection_t
*conn
, bool is_global_bw
)
3324 conn
->read_blocked_on_bw
= 1;
3325 connection_stop_reading(conn
);
3326 reenable_blocked_connection_schedule();
3330 * Mark <b>conn</b> as needing to stop reading because write bandwidth has
3331 * been exhausted. If <b>is_global_bw</b>, it is closing because global
3332 * bandwidth limit has been exhausted. Otherwise, it is closing because its
3333 * own bandwidth limit has been exhausted.
3336 connection_write_bw_exhausted(connection_t
*conn
, bool is_global_bw
)
3339 conn
->write_blocked_on_bw
= 1;
3340 connection_stop_writing(conn
);
3341 reenable_blocked_connection_schedule();
3344 /** If we have exhausted our global buckets, or the buckets for conn,
3347 connection_consider_empty_read_buckets(connection_t
*conn
)
3351 if (!connection_is_rate_limited(conn
))
3352 return; /* Always okay. */
3356 if (token_bucket_rw_get_read(&global_bucket
) <= 0) {
3357 reason
= "global read bucket exhausted. Pausing.";
3358 } else if (connection_counts_as_relayed_traffic(conn
, approx_time()) &&
3359 token_bucket_rw_get_read(&global_relayed_bucket
) <= 0) {
3360 reason
= "global relayed read bucket exhausted. Pausing.";
3361 } else if (connection_speaks_cells(conn
) &&
3362 conn
->state
== OR_CONN_STATE_OPEN
&&
3363 token_bucket_rw_get_read(&TO_OR_CONN(conn
)->bucket
) <= 0) {
3364 reason
= "connection read bucket exhausted. Pausing.";
3367 return; /* all good, no need to stop it */
3369 LOG_FN_CONN(conn
, (LOG_DEBUG
, LD_NET
, "%s", reason
));
3370 connection_read_bw_exhausted(conn
, is_global
);
3373 /** If we have exhausted our global buckets, or the buckets for conn,
3376 connection_consider_empty_write_buckets(connection_t
*conn
)
3380 if (!connection_is_rate_limited(conn
))
3381 return; /* Always okay. */
3383 bool is_global
= true;
3384 if (token_bucket_rw_get_write(&global_bucket
) <= 0) {
3385 reason
= "global write bucket exhausted. Pausing.";
3386 } else if (connection_counts_as_relayed_traffic(conn
, approx_time()) &&
3387 token_bucket_rw_get_write(&global_relayed_bucket
) <= 0) {
3388 reason
= "global relayed write bucket exhausted. Pausing.";
3389 } else if (connection_speaks_cells(conn
) &&
3390 conn
->state
== OR_CONN_STATE_OPEN
&&
3391 token_bucket_rw_get_write(&TO_OR_CONN(conn
)->bucket
) <= 0) {
3392 reason
= "connection write bucket exhausted. Pausing.";
3395 return; /* all good, no need to stop it */
3397 LOG_FN_CONN(conn
, (LOG_DEBUG
, LD_NET
, "%s", reason
));
3398 connection_write_bw_exhausted(conn
, is_global
);
3401 /** Initialize the global buckets to the values configured in the
3404 connection_bucket_init(void)
3406 const or_options_t
*options
= get_options();
3407 const uint32_t now_ts
= monotime_coarse_get_stamp();
3408 token_bucket_rw_init(&global_bucket
,
3409 (int32_t)options
->BandwidthRate
,
3410 (int32_t)options
->BandwidthBurst
,
3412 if (options
->RelayBandwidthRate
) {
3413 token_bucket_rw_init(&global_relayed_bucket
,
3414 (int32_t)options
->RelayBandwidthRate
,
3415 (int32_t)options
->RelayBandwidthBurst
,
3418 token_bucket_rw_init(&global_relayed_bucket
,
3419 (int32_t)options
->BandwidthRate
,
3420 (int32_t)options
->BandwidthBurst
,
3424 reenable_blocked_connection_init(options
);
3427 /** Update the global connection bucket settings to a new value. */
3429 connection_bucket_adjust(const or_options_t
*options
)
3431 token_bucket_rw_adjust(&global_bucket
,
3432 (int32_t)options
->BandwidthRate
,
3433 (int32_t)options
->BandwidthBurst
);
3434 if (options
->RelayBandwidthRate
) {
3435 token_bucket_rw_adjust(&global_relayed_bucket
,
3436 (int32_t)options
->RelayBandwidthRate
,
3437 (int32_t)options
->RelayBandwidthBurst
);
3439 token_bucket_rw_adjust(&global_relayed_bucket
,
3440 (int32_t)options
->BandwidthRate
,
3441 (int32_t)options
->BandwidthBurst
);
3446 * Cached value of the last coarse-timestamp when we refilled the
3449 static uint32_t last_refilled_global_buckets_ts
=0;
3451 * Refill the token buckets for a single connection <b>conn</b>, and the
3452 * global token buckets as appropriate. Requires that <b>now_ts</b> is
3453 * the time in coarse timestamp units.
3456 connection_bucket_refill_single(connection_t
*conn
, uint32_t now_ts
)
3458 /* Note that we only check for equality here: the underlying
3459 * token bucket functions can handle moving backwards in time if they
3461 if (now_ts
!= last_refilled_global_buckets_ts
) {
3462 token_bucket_rw_refill(&global_bucket
, now_ts
);
3463 token_bucket_rw_refill(&global_relayed_bucket
, now_ts
);
3464 last_refilled_global_buckets_ts
= now_ts
;
3467 if (connection_speaks_cells(conn
) && conn
->state
== OR_CONN_STATE_OPEN
) {
3468 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
3469 token_bucket_rw_refill(&or_conn
->bucket
, now_ts
);
3474 * Event to re-enable all connections that were previously blocked on read or
3477 static mainloop_event_t
*reenable_blocked_connections_ev
= NULL
;
3479 /** True iff reenable_blocked_connections_ev is currently scheduled. */
3480 static int reenable_blocked_connections_is_scheduled
= 0;
3482 /** Delay after which to run reenable_blocked_connections_ev. */
3483 static struct timeval reenable_blocked_connections_delay
;
3486 * Re-enable all connections that were previously blocked on read or write.
3487 * This event is scheduled after enough time has elapsed to be sure
3488 * that the buckets will refill when the connections have something to do.
3491 reenable_blocked_connections_cb(mainloop_event_t
*ev
, void *arg
)
3495 SMARTLIST_FOREACH_BEGIN(get_connection_array(), connection_t
*, conn
) {
3496 if (conn
->read_blocked_on_bw
== 1) {
3497 connection_start_reading(conn
);
3498 conn
->read_blocked_on_bw
= 0;
3500 if (conn
->write_blocked_on_bw
== 1) {
3501 connection_start_writing(conn
);
3502 conn
->write_blocked_on_bw
= 0;
3504 } SMARTLIST_FOREACH_END(conn
);
3506 reenable_blocked_connections_is_scheduled
= 0;
3510 * Initialize the mainloop event that we use to wake up connections that
3511 * find themselves blocked on bandwidth.
3514 reenable_blocked_connection_init(const or_options_t
*options
)
3516 if (! reenable_blocked_connections_ev
) {
3517 reenable_blocked_connections_ev
=
3518 mainloop_event_new(reenable_blocked_connections_cb
, NULL
);
3519 reenable_blocked_connections_is_scheduled
= 0;
3521 time_t sec
= options
->TokenBucketRefillInterval
/ 1000;
3522 int msec
= (options
->TokenBucketRefillInterval
% 1000);
3523 reenable_blocked_connections_delay
.tv_sec
= sec
;
3524 reenable_blocked_connections_delay
.tv_usec
= msec
* 1000;
3528 * Called when we have blocked a connection for being low on bandwidth:
3529 * schedule an event to reenable such connections, if it is not already
3533 reenable_blocked_connection_schedule(void)
3535 if (reenable_blocked_connections_is_scheduled
)
3537 if (BUG(reenable_blocked_connections_ev
== NULL
)) {
3538 reenable_blocked_connection_init(get_options());
3540 mainloop_event_schedule(reenable_blocked_connections_ev
,
3541 &reenable_blocked_connections_delay
);
3542 reenable_blocked_connections_is_scheduled
= 1;
3545 /** Read bytes from conn-\>s and process them.
3547 * It calls connection_buf_read_from_socket() to bring in any new bytes,
3548 * and then calls connection_process_inbuf() to process them.
3550 * Mark the connection and return -1 if you want to close it, else
3554 connection_handle_read_impl(connection_t
*conn
)
3556 ssize_t max_to_read
=-1, try_to_read
;
3557 size_t before
, n_read
= 0;
3558 int socket_error
= 0;
3560 if (conn
->marked_for_close
)
3561 return 0; /* do nothing */
3563 conn
->timestamp_last_read_allowed
= approx_time();
3565 connection_bucket_refill_single(conn
, monotime_coarse_get_stamp());
3567 switch (conn
->type
) {
3568 case CONN_TYPE_OR_LISTENER
:
3569 return connection_handle_listener_read(conn
, CONN_TYPE_OR
);
3570 case CONN_TYPE_EXT_OR_LISTENER
:
3571 return connection_handle_listener_read(conn
, CONN_TYPE_EXT_OR
);
3572 case CONN_TYPE_AP_LISTENER
:
3573 case CONN_TYPE_AP_TRANS_LISTENER
:
3574 case CONN_TYPE_AP_NATD_LISTENER
:
3575 case CONN_TYPE_AP_HTTP_CONNECT_LISTENER
:
3576 return connection_handle_listener_read(conn
, CONN_TYPE_AP
);
3577 case CONN_TYPE_DIR_LISTENER
:
3578 return connection_handle_listener_read(conn
, CONN_TYPE_DIR
);
3579 case CONN_TYPE_CONTROL_LISTENER
:
3580 return connection_handle_listener_read(conn
, CONN_TYPE_CONTROL
);
3581 case CONN_TYPE_AP_DNS_LISTENER
:
3582 /* This should never happen; eventdns.c handles the reads here. */
3583 tor_fragile_assert();
3588 try_to_read
= max_to_read
;
3589 tor_assert(!conn
->marked_for_close
);
3591 before
= buf_datalen(conn
->inbuf
);
3592 if (connection_buf_read_from_socket(conn
, &max_to_read
, &socket_error
) < 0) {
3593 /* There's a read error; kill the connection.*/
3594 if (conn
->type
== CONN_TYPE_OR
) {
3595 connection_or_notify_error(TO_OR_CONN(conn
),
3597 errno_to_orconn_end_reason(socket_error
) :
3598 END_OR_CONN_REASON_CONNRESET
,
3600 tor_socket_strerror(socket_error
) :
3601 "(unknown, errno was 0)");
3603 if (CONN_IS_EDGE(conn
)) {
3604 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
3605 connection_edge_end_errno(edge_conn
);
3606 if (conn
->type
== CONN_TYPE_AP
&& TO_ENTRY_CONN(conn
)->socks_request
) {
3607 /* broken, don't send a socks reply back */
3608 TO_ENTRY_CONN(conn
)->socks_request
->has_finished
= 1;
3611 connection_close_immediate(conn
); /* Don't flush; connection is dead. */
3613 * This can bypass normal channel checking since we did
3614 * connection_or_notify_error() above.
3616 connection_mark_for_close_internal(conn
);
3619 n_read
+= buf_datalen(conn
->inbuf
) - before
;
3620 if (CONN_IS_EDGE(conn
) && try_to_read
!= max_to_read
) {
3621 /* instruct it not to try to package partial cells. */
3622 if (connection_process_inbuf(conn
, 0) < 0) {
3625 if (!conn
->marked_for_close
&&
3626 connection_is_reading(conn
) &&
3627 !conn
->inbuf_reached_eof
&&
3629 goto loop_again
; /* try reading again, in case more is here now */
3631 /* one last try, packaging partial cells and all. */
3632 if (!conn
->marked_for_close
&&
3633 connection_process_inbuf(conn
, 1) < 0) {
3636 if (conn
->linked_conn
) {
3637 /* The other side's handle_write() will never actually get called, so
3638 * we need to invoke the appropriate callbacks ourself. */
3639 connection_t
*linked
= conn
->linked_conn
;
3642 /* Probably a no-op, since linked conns typically don't count for
3643 * bandwidth rate limiting. But do it anyway so we can keep stats
3644 * accurately. Note that since we read the bytes from conn, and
3645 * we're writing the bytes onto the linked connection, we count
3646 * these as <i>written</i> bytes. */
3647 connection_buckets_decrement(linked
, approx_time(), 0, n_read
);
3649 if (connection_flushed_some(linked
) < 0)
3650 connection_mark_for_close(linked
);
3651 if (!connection_wants_to_flush(linked
))
3652 connection_finished_flushing(linked
);
3655 if (!buf_datalen(linked
->outbuf
) && conn
->active_on_link
)
3656 connection_stop_reading_from_linked_conn(conn
);
3658 /* If we hit the EOF, call connection_reached_eof(). */
3659 if (!conn
->marked_for_close
&&
3660 conn
->inbuf_reached_eof
&&
3661 connection_reached_eof(conn
) < 0) {
3667 /* DOCDOC connection_handle_read */
3669 connection_handle_read(connection_t
*conn
)
3672 update_current_time(time(NULL
));
3673 res
= connection_handle_read_impl(conn
);
3677 /** Pull in new bytes from conn-\>s or conn-\>linked_conn onto conn-\>inbuf,
3678 * either directly or via TLS. Reduce the token buckets by the number of bytes
3681 * If *max_to_read is -1, then decide it ourselves, else go with the
3682 * value passed to us. When returning, if it's changed, subtract the
3683 * number of bytes we read from *max_to_read.
3685 * Return -1 if we want to break conn, else return 0.
3688 connection_buf_read_from_socket(connection_t
*conn
, ssize_t
*max_to_read
,
3692 ssize_t at_most
= *max_to_read
;
3693 size_t slack_in_buf
, more_to_read
;
3694 size_t n_read
= 0, n_written
= 0;
3696 if (at_most
== -1) { /* we need to initialize it */
3697 /* how many bytes are we allowed to read? */
3698 at_most
= connection_bucket_read_limit(conn
, approx_time());
3701 slack_in_buf
= buf_slack(conn
->inbuf
);
3703 if ((size_t)at_most
> slack_in_buf
&& slack_in_buf
>= 1024) {
3704 more_to_read
= at_most
- slack_in_buf
;
3705 at_most
= slack_in_buf
;
3710 if (connection_speaks_cells(conn
) &&
3711 conn
->state
> OR_CONN_STATE_PROXY_HANDSHAKING
) {
3713 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
3714 size_t initial_size
;
3715 if (conn
->state
== OR_CONN_STATE_TLS_HANDSHAKING
||
3716 conn
->state
== OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING
) {
3717 /* continue handshaking even if global token bucket is empty */
3718 return connection_tls_continue_handshake(or_conn
);
3722 "%d: starting, inbuf_datalen %ld (%d pending in tls object)."
3724 (int)conn
->s
,(long)buf_datalen(conn
->inbuf
),
3725 tor_tls_get_pending_bytes(or_conn
->tls
), (long)at_most
);
3727 initial_size
= buf_datalen(conn
->inbuf
);
3728 /* else open, or closing */
3729 result
= buf_read_from_tls(conn
->inbuf
, or_conn
->tls
, at_most
);
3730 if (TOR_TLS_IS_ERROR(result
) || result
== TOR_TLS_CLOSE
)
3731 or_conn
->tls_error
= result
;
3733 or_conn
->tls_error
= 0;
3737 case TOR_TLS_ERROR_IO
:
3738 log_debug(LD_NET
,"TLS connection closed %son read. Closing. "
3739 "(Nickname %s, address %s)",
3740 result
== TOR_TLS_CLOSE
? "cleanly " : "",
3741 or_conn
->nickname
? or_conn
->nickname
: "not set",
3744 CASE_TOR_TLS_ERROR_ANY_NONIO
:
3745 log_debug(LD_NET
,"tls error [%s]. breaking (nickname %s, address %s).",
3746 tor_tls_err_to_string(result
),
3747 or_conn
->nickname
? or_conn
->nickname
: "not set",
3750 case TOR_TLS_WANTWRITE
:
3751 connection_start_writing(conn
);
3753 case TOR_TLS_WANTREAD
:
3754 if (conn
->in_connection_handle_write
) {
3755 /* We've been invoked from connection_handle_write, because we're
3756 * waiting for a TLS renegotiation, the renegotiation started, and
3757 * SSL_read returned WANTWRITE. But now SSL_read is saying WANTREAD
3758 * again. Stop waiting for write events now, or else we'll
3759 * busy-loop until data arrives for us to read.
3760 * XXX: remove this when v2 handshakes support is dropped. */
3761 connection_stop_writing(conn
);
3762 if (!connection_is_reading(conn
))
3763 connection_start_reading(conn
);
3765 /* we're already reading, one hopes */
3767 case TOR_TLS_DONE
: /* no data read, so nothing to process */
3768 break; /* so we call bucket_decrement below */
3772 pending
= tor_tls_get_pending_bytes(or_conn
->tls
);
3774 /* If we have any pending bytes, we read them now. This *can*
3775 * take us over our read allotment, but really we shouldn't be
3776 * believing that SSL bytes are the same as TCP bytes anyway. */
3777 int r2
= buf_read_from_tls(conn
->inbuf
, or_conn
->tls
, pending
);
3779 log_warn(LD_BUG
, "apparently, reading pending bytes can fail.");
3783 result
= (int)(buf_datalen(conn
->inbuf
)-initial_size
);
3784 tor_tls_get_n_raw_bytes(or_conn
->tls
, &n_read
, &n_written
);
3785 log_debug(LD_GENERAL
, "After TLS read of %d: %ld read, %ld written",
3786 result
, (long)n_read
, (long)n_written
);
3787 } else if (conn
->linked
) {
3788 if (conn
->linked_conn
) {
3789 result
= buf_move_to_buf(conn
->inbuf
, conn
->linked_conn
->outbuf
,
3790 &conn
->linked_conn
->outbuf_flushlen
);
3794 //log_notice(LD_GENERAL, "Moved %d bytes on an internal link!", result);
3795 /* If the other side has disappeared, or if it's been marked for close and
3796 * we flushed its outbuf, then we should set our inbuf_reached_eof. */
3797 if (!conn
->linked_conn
||
3798 (conn
->linked_conn
->marked_for_close
&&
3799 buf_datalen(conn
->linked_conn
->outbuf
) == 0))
3800 conn
->inbuf_reached_eof
= 1;
3802 n_read
= (size_t) result
;
3804 /* !connection_speaks_cells, !conn->linked_conn. */
3805 int reached_eof
= 0;
3806 CONN_LOG_PROTECT(conn
,
3807 result
= buf_read_from_socket(conn
->inbuf
, conn
->s
,
3812 conn
->inbuf_reached_eof
= 1;
3814 // log_fn(LOG_DEBUG,"read_to_buf returned %d.",read_result);
3818 n_read
= (size_t) result
;
3822 /* change *max_to_read */
3823 *max_to_read
= at_most
- n_read
;
3825 /* Update edge_conn->n_read */
3826 if (conn
->type
== CONN_TYPE_AP
) {
3827 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
3829 /* Check for overflow: */
3830 if (PREDICT_LIKELY(UINT32_MAX
- edge_conn
->n_read
> n_read
))
3831 edge_conn
->n_read
+= (int)n_read
;
3833 edge_conn
->n_read
= UINT32_MAX
;
3836 /* If CONN_BW events are enabled, update conn->n_read_conn_bw for
3837 * OR/DIR/EXIT connections, checking for overflow. */
3838 if (get_options()->TestingEnableConnBwEvent
&&
3839 (conn
->type
== CONN_TYPE_OR
||
3840 conn
->type
== CONN_TYPE_DIR
||
3841 conn
->type
== CONN_TYPE_EXIT
)) {
3842 if (PREDICT_LIKELY(UINT32_MAX
- conn
->n_read_conn_bw
> n_read
))
3843 conn
->n_read_conn_bw
+= (int)n_read
;
3845 conn
->n_read_conn_bw
= UINT32_MAX
;
3849 connection_buckets_decrement(conn
, approx_time(), n_read
, n_written
);
3851 if (more_to_read
&& result
== at_most
) {
3852 slack_in_buf
= buf_slack(conn
->inbuf
);
3853 at_most
= more_to_read
;
3857 /* Call even if result is 0, since the global read bucket may
3858 * have reached 0 on a different conn, and this connection needs to
3859 * know to stop reading. */
3860 connection_consider_empty_read_buckets(conn
);
3861 if (n_written
> 0 && connection_is_writing(conn
))
3862 connection_consider_empty_write_buckets(conn
);
3867 /** A pass-through to fetch_from_buf. */
3869 connection_buf_get_bytes(char *string
, size_t len
, connection_t
*conn
)
3871 return buf_get_bytes(conn
->inbuf
, string
, len
);
3874 /** As buf_get_line(), but read from a connection's input buffer. */
3876 connection_buf_get_line(connection_t
*conn
, char *data
,
3879 return buf_get_line(conn
->inbuf
, data
, data_len
);
3882 /** As fetch_from_buf_http, but fetches from a connection's input buffer_t as
3885 connection_fetch_from_buf_http(connection_t
*conn
,
3886 char **headers_out
, size_t max_headerlen
,
3887 char **body_out
, size_t *body_used
,
3888 size_t max_bodylen
, int force_complete
)
3890 return fetch_from_buf_http(conn
->inbuf
, headers_out
, max_headerlen
,
3891 body_out
, body_used
, max_bodylen
, force_complete
);
3894 /** Return conn-\>outbuf_flushlen: how many bytes conn wants to flush
3895 * from its outbuf. */
3897 connection_wants_to_flush(connection_t
*conn
)
3899 return conn
->outbuf_flushlen
> 0;
3902 /** Are there too many bytes on edge connection <b>conn</b>'s outbuf to
3903 * send back a relay-level sendme yet? Return 1 if so, 0 if not. Used by
3904 * connection_edge_consider_sending_sendme().
3907 connection_outbuf_too_full(connection_t
*conn
)
3909 return (conn
->outbuf_flushlen
> 10*CELL_PAYLOAD_SIZE
);
3913 * On Windows Vista and Windows 7, tune the send buffer size according to a
3916 * This should help fix slow upload rates.
3919 update_send_buffer_size(tor_socket_t sock
)
3922 /* We only do this on Vista and 7, because earlier versions of Windows
3923 * don't have the SIO_IDEAL_SEND_BACKLOG_QUERY functionality, and on
3924 * later versions it isn't necessary. */
3925 static int isVistaOr7
= -1;
3926 if (isVistaOr7
== -1) {
3928 OSVERSIONINFO osvi
= { 0 };
3929 osvi
.dwOSVersionInfoSize
= sizeof(OSVERSIONINFO
);
3930 GetVersionEx(&osvi
);
3931 if (osvi
.dwMajorVersion
== 6 && osvi
.dwMinorVersion
< 2)
3936 if (get_options()->ConstrainedSockets
)
3939 DWORD bytesReturned
= 0;
3940 if (!WSAIoctl(sock
, SIO_IDEAL_SEND_BACKLOG_QUERY
, NULL
, 0,
3941 &isb
, sizeof(isb
), &bytesReturned
, NULL
, NULL
)) {
3942 setsockopt(sock
, SOL_SOCKET
, SO_SNDBUF
, (const char*)&isb
, sizeof(isb
));
3949 /** Try to flush more bytes onto <b>conn</b>-\>s.
3951 * This function is called in connection_handle_write(), which gets
3952 * called from conn_write_callback() in main.c when libevent tells us
3953 * that <b>conn</b> wants to write.
3955 * Update <b>conn</b>-\>timestamp_last_write_allowed to now, and call flush_buf
3956 * or flush_buf_tls appropriately. If it succeeds and there are no more
3957 * more bytes on <b>conn</b>-\>outbuf, then call connection_finished_flushing
3960 * If <b>force</b>, then write as many bytes as possible, ignoring bandwidth
3961 * limits. (Used for flushing messages to controller connections on fatal
3964 * Mark the connection and return -1 if you want to close it, else
3968 connection_handle_write_impl(connection_t
*conn
, int force
)
3971 socklen_t len
=(socklen_t
)sizeof(e
);
3973 ssize_t max_to_write
;
3974 time_t now
= approx_time();
3975 size_t n_read
= 0, n_written
= 0;
3976 int dont_stop_writing
= 0;
3978 tor_assert(!connection_is_listener(conn
));
3980 if (conn
->marked_for_close
|| !SOCKET_OK(conn
->s
))
3981 return 0; /* do nothing */
3983 if (conn
->in_flushed_some
) {
3984 log_warn(LD_BUG
, "called recursively from inside conn->in_flushed_some");
3988 conn
->timestamp_last_write_allowed
= now
;
3990 connection_bucket_refill_single(conn
, monotime_coarse_get_stamp());
3992 /* Sometimes, "writable" means "connected". */
3993 if (connection_state_is_connecting(conn
)) {
3994 if (getsockopt(conn
->s
, SOL_SOCKET
, SO_ERROR
, (void*)&e
, &len
) < 0) {
3995 log_warn(LD_BUG
, "getsockopt() syscall failed");
3996 if (conn
->type
== CONN_TYPE_OR
) {
3997 or_connection_t
*orconn
= TO_OR_CONN(conn
);
3998 connection_or_close_for_error(orconn
, 0);
4000 if (CONN_IS_EDGE(conn
)) {
4001 connection_edge_end_errno(TO_EDGE_CONN(conn
));
4003 connection_mark_for_close(conn
);
4008 /* some sort of error, but maybe just inprogress still */
4009 if (!ERRNO_IS_CONN_EINPROGRESS(e
)) {
4010 log_info(LD_NET
,"in-progress connect failed. Removing. (%s)",
4011 tor_socket_strerror(e
));
4012 if (CONN_IS_EDGE(conn
))
4013 connection_edge_end_errno(TO_EDGE_CONN(conn
));
4014 if (conn
->type
== CONN_TYPE_OR
)
4015 connection_or_notify_error(TO_OR_CONN(conn
),
4016 errno_to_orconn_end_reason(e
),
4017 tor_socket_strerror(e
));
4019 connection_close_immediate(conn
);
4021 * This can bypass normal channel checking since we did
4022 * connection_or_notify_error() above.
4024 connection_mark_for_close_internal(conn
);
4027 return 0; /* no change, see if next time is better */
4030 /* The connection is successful. */
4031 if (connection_finished_connecting(conn
)<0)
4035 max_to_write
= force
? (ssize_t
)conn
->outbuf_flushlen
4036 : connection_bucket_write_limit(conn
, now
);
4038 if (connection_speaks_cells(conn
) &&
4039 conn
->state
> OR_CONN_STATE_PROXY_HANDSHAKING
) {
4040 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
4041 size_t initial_size
;
4042 if (conn
->state
== OR_CONN_STATE_TLS_HANDSHAKING
||
4043 conn
->state
== OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING
) {
4044 connection_stop_writing(conn
);
4045 if (connection_tls_continue_handshake(or_conn
) < 0) {
4046 /* Don't flush; connection is dead. */
4047 connection_or_notify_error(or_conn
,
4048 END_OR_CONN_REASON_MISC
,
4049 "TLS error in connection_tls_"
4050 "continue_handshake()");
4051 connection_close_immediate(conn
);
4053 * This can bypass normal channel checking since we did
4054 * connection_or_notify_error() above.
4056 connection_mark_for_close_internal(conn
);
4060 } else if (conn
->state
== OR_CONN_STATE_TLS_SERVER_RENEGOTIATING
) {
4061 return connection_handle_read(conn
);
4064 /* else open, or closing */
4065 initial_size
= buf_datalen(conn
->outbuf
);
4066 result
= buf_flush_to_tls(conn
->outbuf
, or_conn
->tls
,
4067 max_to_write
, &conn
->outbuf_flushlen
);
4070 update_send_buffer_size(conn
->s
);
4072 /* If we just flushed the last bytes, tell the channel on the
4073 * or_conn to check if it needs to geoip_change_dirreq_state() */
4074 /* XXXX move this to flushed_some or finished_flushing -NM */
4075 if (buf_datalen(conn
->outbuf
) == 0 && or_conn
->chan
)
4076 channel_notify_flushed(TLS_CHAN_TO_BASE(or_conn
->chan
));
4079 CASE_TOR_TLS_ERROR_ANY
:
4081 log_info(LD_NET
, result
!= TOR_TLS_CLOSE
?
4082 "tls error. breaking.":"TLS connection closed on flush");
4083 /* Don't flush; connection is dead. */
4084 connection_or_notify_error(or_conn
,
4085 END_OR_CONN_REASON_MISC
,
4086 result
!= TOR_TLS_CLOSE
?
4087 "TLS error in during flush" :
4088 "TLS closed during flush");
4089 connection_close_immediate(conn
);
4091 * This can bypass normal channel checking since we did
4092 * connection_or_notify_error() above.
4094 connection_mark_for_close_internal(conn
);
4096 case TOR_TLS_WANTWRITE
:
4097 log_debug(LD_NET
,"wanted write.");
4098 /* we're already writing */
4099 dont_stop_writing
= 1;
4101 case TOR_TLS_WANTREAD
:
4102 /* Make sure to avoid a loop if the receive buckets are empty. */
4103 log_debug(LD_NET
,"wanted read.");
4104 if (!connection_is_reading(conn
)) {
4105 connection_write_bw_exhausted(conn
, true);
4106 /* we'll start reading again when we get more tokens in our
4107 * read bucket; then we'll start writing again too.
4110 /* else no problem, we're already reading */
4112 /* case TOR_TLS_DONE:
4113 * for TOR_TLS_DONE, fall through to check if the flushlen
4114 * is empty, so we can stop writing.
4118 tor_tls_get_n_raw_bytes(or_conn
->tls
, &n_read
, &n_written
);
4119 log_debug(LD_GENERAL
, "After TLS write of %d: %ld read, %ld written",
4120 result
, (long)n_read
, (long)n_written
);
4121 or_conn
->bytes_xmitted
+= result
;
4122 or_conn
->bytes_xmitted_by_tls
+= n_written
;
4123 /* So we notice bytes were written even on error */
4124 /* XXXX This cast is safe since we can never write INT_MAX bytes in a
4125 * single set of TLS operations. But it looks kinda ugly. If we refactor
4126 * the *_buf_tls functions, we should make them return ssize_t or size_t
4128 result
= (int)(initial_size
-buf_datalen(conn
->outbuf
));
4130 CONN_LOG_PROTECT(conn
,
4131 result
= buf_flush_to_socket(conn
->outbuf
, conn
->s
,
4132 max_to_write
, &conn
->outbuf_flushlen
));
4134 if (CONN_IS_EDGE(conn
))
4135 connection_edge_end_errno(TO_EDGE_CONN(conn
));
4136 if (conn
->type
== CONN_TYPE_AP
) {
4137 /* writing failed; we couldn't send a SOCKS reply if we wanted to */
4138 TO_ENTRY_CONN(conn
)->socks_request
->has_finished
= 1;
4141 connection_close_immediate(conn
); /* Don't flush; connection is dead. */
4142 connection_mark_for_close(conn
);
4145 update_send_buffer_size(conn
->s
);
4146 n_written
= (size_t) result
;
4149 if (n_written
&& conn
->type
== CONN_TYPE_AP
) {
4150 edge_connection_t
*edge_conn
= TO_EDGE_CONN(conn
);
4152 /* Check for overflow: */
4153 if (PREDICT_LIKELY(UINT32_MAX
- edge_conn
->n_written
> n_written
))
4154 edge_conn
->n_written
+= (int)n_written
;
4156 edge_conn
->n_written
= UINT32_MAX
;
4159 /* If CONN_BW events are enabled, update conn->n_written_conn_bw for
4160 * OR/DIR/EXIT connections, checking for overflow. */
4161 if (n_written
&& get_options()->TestingEnableConnBwEvent
&&
4162 (conn
->type
== CONN_TYPE_OR
||
4163 conn
->type
== CONN_TYPE_DIR
||
4164 conn
->type
== CONN_TYPE_EXIT
)) {
4165 if (PREDICT_LIKELY(UINT32_MAX
- conn
->n_written_conn_bw
> n_written
))
4166 conn
->n_written_conn_bw
+= (int)n_written
;
4168 conn
->n_written_conn_bw
= UINT32_MAX
;
4171 connection_buckets_decrement(conn
, approx_time(), n_read
, n_written
);
4174 /* If we wrote any bytes from our buffer, then call the appropriate
4176 if (connection_flushed_some(conn
) < 0) {
4177 if (connection_speaks_cells(conn
)) {
4178 connection_or_notify_error(TO_OR_CONN(conn
),
4179 END_OR_CONN_REASON_MISC
,
4180 "Got error back from "
4181 "connection_flushed_some()");
4185 * This can bypass normal channel checking since we did
4186 * connection_or_notify_error() above.
4188 connection_mark_for_close_internal(conn
);
4192 if (!connection_wants_to_flush(conn
) &&
4193 !dont_stop_writing
) { /* it's done flushing */
4194 if (connection_finished_flushing(conn
) < 0) {
4195 /* already marked */
4201 /* Call even if result is 0, since the global write bucket may
4202 * have reached 0 on a different conn, and this connection needs to
4203 * know to stop writing. */
4204 connection_consider_empty_write_buckets(conn
);
4205 if (n_read
> 0 && connection_is_reading(conn
))
4206 connection_consider_empty_read_buckets(conn
);
4211 /* DOCDOC connection_handle_write */
4213 connection_handle_write(connection_t
*conn
, int force
)
4216 update_current_time(time(NULL
));
4217 /* connection_handle_write_impl() might call connection_handle_read()
4218 * if we're in the middle of a v2 handshake, in which case it needs this
4220 conn
->in_connection_handle_write
= 1;
4221 res
= connection_handle_write_impl(conn
, force
);
4222 conn
->in_connection_handle_write
= 0;
4227 * Try to flush data that's waiting for a write on <b>conn</b>. Return
4228 * -1 on failure, 0 on success.
4230 * Don't use this function for regular writing; the buffers
4231 * system should be good enough at scheduling writes there. Instead, this
4232 * function is for cases when we're about to exit or something and we want
4233 * to report it right away.
4236 connection_flush(connection_t
*conn
)
4238 return connection_handle_write(conn
, 1);
4241 /** Helper for connection_write_to_buf_impl and connection_write_buf_to_buf:
4243 * Return true iff it is okay to queue bytes on <b>conn</b>'s outbuf for
4247 connection_may_write_to_buf(connection_t
*conn
)
4249 /* if it's marked for close, only allow write if we mean to flush it */
4250 if (conn
->marked_for_close
&& !conn
->hold_open_until_flushed
)
4256 /** Helper for connection_write_to_buf_impl and connection_write_buf_to_buf:
4258 * Called when an attempt to add bytes on <b>conn</b>'s outbuf has failed;
4259 * mark the connection and warn as appropriate.
4262 connection_write_to_buf_failed(connection_t
*conn
)
4264 if (CONN_IS_EDGE(conn
)) {
4265 /* if it failed, it means we have our package/delivery windows set
4266 wrong compared to our max outbuf size. close the whole circuit. */
4268 "write_to_buf failed. Closing circuit (fd %d).", (int)conn
->s
);
4269 circuit_mark_for_close(circuit_get_by_edge_conn(TO_EDGE_CONN(conn
)),
4270 END_CIRC_REASON_INTERNAL
);
4271 } else if (conn
->type
== CONN_TYPE_OR
) {
4272 or_connection_t
*orconn
= TO_OR_CONN(conn
);
4274 "write_to_buf failed on an orconn; notifying of error "
4275 "(fd %d)", (int)(conn
->s
));
4276 connection_or_close_for_error(orconn
, 0);
4279 "write_to_buf failed. Closing connection (fd %d).",
4281 connection_mark_for_close(conn
);
4285 /** Helper for connection_write_to_buf_impl and connection_write_buf_to_buf:
4287 * Called when an attempt to add bytes on <b>conn</b>'s outbuf has succeeded:
4288 * record the number of bytes added.
4291 connection_write_to_buf_commit(connection_t
*conn
, size_t len
)
4293 /* If we receive optimistic data in the EXIT_CONN_STATE_RESOLVING
4294 * state, we don't want to try to write it right away, since
4295 * conn->write_event won't be set yet. Otherwise, write data from
4296 * this conn as the socket is available. */
4297 if (conn
->write_event
) {
4298 connection_start_writing(conn
);
4300 conn
->outbuf_flushlen
+= len
;
4303 /** Append <b>len</b> bytes of <b>string</b> onto <b>conn</b>'s
4304 * outbuf, and ask it to start writing.
4306 * If <b>zlib</b> is nonzero, this is a directory connection that should get
4307 * its contents compressed or decompressed as they're written. If zlib is
4308 * negative, this is the last data to be compressed, and the connection's zlib
4309 * state should be flushed.
4312 connection_write_to_buf_impl_
,(const char *string
, size_t len
,
4313 connection_t
*conn
, int zlib
))
4315 /* XXXX This function really needs to return -1 on failure. */
4317 if (!len
&& !(zlib
<0))
4320 if (!connection_may_write_to_buf(conn
))
4326 size_t old_datalen
= buf_datalen(conn
->outbuf
);
4327 dir_connection_t
*dir_conn
= TO_DIR_CONN(conn
);
4328 int done
= zlib
< 0;
4329 CONN_LOG_PROTECT(conn
, r
= buf_add_compress(conn
->outbuf
,
4330 dir_conn
->compress_state
,
4331 string
, len
, done
));
4332 written
= buf_datalen(conn
->outbuf
) - old_datalen
;
4334 CONN_LOG_PROTECT(conn
, r
= buf_add(conn
->outbuf
, string
, len
));
4338 connection_write_to_buf_failed(conn
);
4341 connection_write_to_buf_commit(conn
, written
);
4345 connection_buf_add_compress(const char *string
, size_t len
,
4346 dir_connection_t
*conn
, int done
)
4348 connection_write_to_buf_impl_(string
, len
, TO_CONN(conn
), done
? -1 : 1);
4352 * Add all bytes from <b>buf</b> to <b>conn</b>'s outbuf, draining them
4353 * from <b>buf</b>. (If the connection is marked and will soon be closed,
4354 * nothing is drained.)
4357 connection_buf_add_buf(connection_t
*conn
, buf_t
*buf
)
4361 size_t len
= buf_datalen(buf
);
4365 if (!connection_may_write_to_buf(conn
))
4368 buf_move_all(conn
->outbuf
, buf
);
4369 connection_write_to_buf_commit(conn
, len
);
4372 #define CONN_GET_ALL_TEMPLATE(var, test) \
4374 smartlist_t *conns = get_connection_array(); \
4375 smartlist_t *ret_conns = smartlist_new(); \
4376 SMARTLIST_FOREACH_BEGIN(conns, connection_t *, var) { \
4377 if (var && (test) && !var->marked_for_close) \
4378 smartlist_add(ret_conns, var); \
4379 } SMARTLIST_FOREACH_END(var); \
4383 /* Return a list of connections that aren't close and matches the given type
4384 * and state. The returned list can be empty and must be freed using
4385 * smartlist_free(). The caller does NOT have ownership of the objects in the
4386 * list so it must not free them nor reference them as they can disappear. */
4388 connection_list_by_type_state(int type
, int state
)
4390 CONN_GET_ALL_TEMPLATE(conn
, (conn
->type
== type
&& conn
->state
== state
));
4393 /* Return a list of connections that aren't close and matches the given type
4394 * and purpose. The returned list can be empty and must be freed using
4395 * smartlist_free(). The caller does NOT have ownership of the objects in the
4396 * list so it must not free them nor reference them as they can disappear. */
4398 connection_list_by_type_purpose(int type
, int purpose
)
4400 CONN_GET_ALL_TEMPLATE(conn
,
4401 (conn
->type
== type
&& conn
->purpose
== purpose
));
4404 /** Return a connection_t * from get_connection_array() that satisfies test on
4405 * var, and that is not marked for close. */
4406 #define CONN_GET_TEMPLATE(var, test) \
4408 smartlist_t *conns = get_connection_array(); \
4409 SMARTLIST_FOREACH(conns, connection_t *, var, \
4411 if (var && (test) && !var->marked_for_close) \
4417 /** Return a connection with given type, address, port, and purpose;
4418 * or NULL if no such connection exists (or if all such connections are marked
4420 MOCK_IMPL(connection_t
*,
4421 connection_get_by_type_addr_port_purpose
,(int type
,
4422 const tor_addr_t
*addr
, uint16_t port
,
4425 CONN_GET_TEMPLATE(conn
,
4426 (conn
->type
== type
&&
4427 tor_addr_eq(&conn
->addr
, addr
) &&
4428 conn
->port
== port
&&
4429 conn
->purpose
== purpose
));
4432 /** Return the stream with id <b>id</b> if it is not already marked for
4436 connection_get_by_global_id(uint64_t id
)
4438 CONN_GET_TEMPLATE(conn
, conn
->global_identifier
== id
);
4441 /** Return a connection of type <b>type</b> that is not marked for close.
4444 connection_get_by_type(int type
)
4446 CONN_GET_TEMPLATE(conn
, conn
->type
== type
);
4449 /** Return a connection of type <b>type</b> that is in state <b>state</b>,
4450 * and that is not marked for close.
4453 connection_get_by_type_state(int type
, int state
)
4455 CONN_GET_TEMPLATE(conn
, conn
->type
== type
&& conn
->state
== state
);
4459 * Return a connection of type <b>type</b> that is not an internally linked
4460 * connection, and is not marked for close.
4462 MOCK_IMPL(connection_t
*,
4463 connection_get_by_type_nonlinked
,(int type
))
4465 CONN_GET_TEMPLATE(conn
, conn
->type
== type
&& !conn
->linked
);
4468 /** Return a connection of type <b>type</b> that has rendquery equal
4469 * to <b>rendquery</b>, and that is not marked for close. If state
4470 * is non-zero, conn must be of that state too.
4473 connection_get_by_type_state_rendquery(int type
, int state
,
4474 const char *rendquery
)
4476 tor_assert(type
== CONN_TYPE_DIR
||
4477 type
== CONN_TYPE_AP
|| type
== CONN_TYPE_EXIT
);
4478 tor_assert(rendquery
);
4480 CONN_GET_TEMPLATE(conn
,
4481 (conn
->type
== type
&&
4482 (!state
|| state
== conn
->state
)) &&
4484 (type
== CONN_TYPE_DIR
&&
4485 TO_DIR_CONN(conn
)->rend_data
&&
4486 !rend_cmp_service_ids(rendquery
,
4487 rend_data_get_address(TO_DIR_CONN(conn
)->rend_data
)))
4489 (CONN_IS_EDGE(conn
) &&
4490 TO_EDGE_CONN(conn
)->rend_data
&&
4491 !rend_cmp_service_ids(rendquery
,
4492 rend_data_get_address(TO_EDGE_CONN(conn
)->rend_data
)))
4496 /** Return a new smartlist of dir_connection_t * from get_connection_array()
4497 * that satisfy conn_test on connection_t *conn_var, and dirconn_test on
4498 * dir_connection_t *dirconn_var. conn_var must be of CONN_TYPE_DIR and not
4499 * marked for close to be included in the list. */
4500 #define DIR_CONN_LIST_TEMPLATE(conn_var, conn_test, \
4501 dirconn_var, dirconn_test) \
4503 smartlist_t *conns = get_connection_array(); \
4504 smartlist_t *dir_conns = smartlist_new(); \
4505 SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn_var) { \
4506 if (conn_var && (conn_test) \
4507 && conn_var->type == CONN_TYPE_DIR \
4508 && !conn_var->marked_for_close) { \
4509 dir_connection_t *dirconn_var = TO_DIR_CONN(conn_var); \
4510 if (dirconn_var && (dirconn_test)) { \
4511 smartlist_add(dir_conns, dirconn_var); \
4514 } SMARTLIST_FOREACH_END(conn_var); \
4518 /** Return a list of directory connections that are fetching the item
4519 * described by <b>purpose</b>/<b>resource</b>. If there are none,
4520 * return an empty list. This list must be freed using smartlist_free,
4521 * but the pointers in it must not be freed.
4522 * Note that this list should not be cached, as the pointers in it can be
4523 * freed if their connections close. */
4525 connection_dir_list_by_purpose_and_resource(
4527 const char *resource
)
4529 DIR_CONN_LIST_TEMPLATE(conn
,
4530 conn
->purpose
== purpose
,
4532 0 == strcmp_opt(resource
,
4533 dirconn
->requested_resource
));
4536 /** Return a list of directory connections that are fetching the item
4537 * described by <b>purpose</b>/<b>resource</b>/<b>state</b>. If there are
4538 * none, return an empty list. This list must be freed using smartlist_free,
4539 * but the pointers in it must not be freed.
4540 * Note that this list should not be cached, as the pointers in it can be
4541 * freed if their connections close. */
4543 connection_dir_list_by_purpose_resource_and_state(
4545 const char *resource
,
4548 DIR_CONN_LIST_TEMPLATE(conn
,
4549 conn
->purpose
== purpose
&& conn
->state
== state
,
4551 0 == strcmp_opt(resource
,
4552 dirconn
->requested_resource
));
4555 #undef DIR_CONN_LIST_TEMPLATE
4557 /** Return an arbitrary active OR connection that isn't <b>this_conn</b>.
4559 * We use this to guess if we should tell the controller that we
4560 * didn't manage to connect to any of our bridges. */
4561 static connection_t
*
4562 connection_get_another_active_or_conn(const or_connection_t
*this_conn
)
4564 CONN_GET_TEMPLATE(conn
,
4565 conn
!= TO_CONN(this_conn
) && conn
->type
== CONN_TYPE_OR
);
4568 /** Return 1 if there are any active OR connections apart from
4571 * We use this to guess if we should tell the controller that we
4572 * didn't manage to connect to any of our bridges. */
4574 any_other_active_or_conns(const or_connection_t
*this_conn
)
4576 connection_t
*conn
= connection_get_another_active_or_conn(this_conn
);
4578 log_debug(LD_DIR
, "%s: Found an OR connection: %s",
4579 __func__
, conn
->address
);
4586 #undef CONN_GET_TEMPLATE
4588 /** Return 1 if <b>conn</b> is a listener conn, else return 0. */
4590 connection_is_listener(connection_t
*conn
)
4592 if (conn
->type
== CONN_TYPE_OR_LISTENER
||
4593 conn
->type
== CONN_TYPE_EXT_OR_LISTENER
||
4594 conn
->type
== CONN_TYPE_AP_LISTENER
||
4595 conn
->type
== CONN_TYPE_AP_TRANS_LISTENER
||
4596 conn
->type
== CONN_TYPE_AP_DNS_LISTENER
||
4597 conn
->type
== CONN_TYPE_AP_NATD_LISTENER
||
4598 conn
->type
== CONN_TYPE_AP_HTTP_CONNECT_LISTENER
||
4599 conn
->type
== CONN_TYPE_DIR_LISTENER
||
4600 conn
->type
== CONN_TYPE_CONTROL_LISTENER
)
4605 /** Return 1 if <b>conn</b> is in state "open" and is not marked
4606 * for close, else return 0.
4609 connection_state_is_open(connection_t
*conn
)
4613 if (conn
->marked_for_close
)
4616 if ((conn
->type
== CONN_TYPE_OR
&& conn
->state
== OR_CONN_STATE_OPEN
) ||
4617 (conn
->type
== CONN_TYPE_EXT_OR
) ||
4618 (conn
->type
== CONN_TYPE_AP
&& conn
->state
== AP_CONN_STATE_OPEN
) ||
4619 (conn
->type
== CONN_TYPE_EXIT
&& conn
->state
== EXIT_CONN_STATE_OPEN
) ||
4620 (conn
->type
== CONN_TYPE_CONTROL
&&
4621 conn
->state
== CONTROL_CONN_STATE_OPEN
))
4627 /** Return 1 if conn is in 'connecting' state, else return 0. */
4629 connection_state_is_connecting(connection_t
*conn
)
4633 if (conn
->marked_for_close
)
4638 return conn
->state
== OR_CONN_STATE_CONNECTING
;
4639 case CONN_TYPE_EXIT
:
4640 return conn
->state
== EXIT_CONN_STATE_CONNECTING
;
4642 return conn
->state
== DIR_CONN_STATE_CONNECTING
;
4648 /** Allocates a base64'ed authenticator for use in http or https
4649 * auth, based on the input string <b>authenticator</b>. Returns it
4650 * if success, else returns NULL. */
4652 alloc_http_authenticator(const char *authenticator
)
4654 /* an authenticator in Basic authentication
4655 * is just the string "username:password" */
4656 const size_t authenticator_length
= strlen(authenticator
);
4657 const size_t base64_authenticator_length
=
4658 base64_encode_size(authenticator_length
, 0) + 1;
4659 char *base64_authenticator
= tor_malloc(base64_authenticator_length
);
4660 if (base64_encode(base64_authenticator
, base64_authenticator_length
,
4661 authenticator
, authenticator_length
, 0) < 0) {
4662 tor_free(base64_authenticator
); /* free and set to null */
4664 return base64_authenticator
;
4667 /** Given a socket handle, check whether the local address (sockname) of the
4668 * socket is one that we've connected from before. If so, double-check
4669 * whether our address has changed and we need to generate keys. If we do,
4673 client_check_address_changed(tor_socket_t sock
)
4675 tor_addr_t out_addr
, iface_addr
;
4676 tor_addr_t
**last_interface_ip_ptr
;
4679 if (!outgoing_addrs
)
4680 outgoing_addrs
= smartlist_new();
4682 if (tor_addr_from_getsockname(&out_addr
, sock
) < 0) {
4683 int e
= tor_socket_errno(sock
);
4684 log_warn(LD_NET
, "getsockname() to check for address change failed: %s",
4685 tor_socket_strerror(e
));
4688 family
= tor_addr_family(&out_addr
);
4690 if (family
== AF_INET
)
4691 last_interface_ip_ptr
= &last_interface_ipv4
;
4692 else if (family
== AF_INET6
)
4693 last_interface_ip_ptr
= &last_interface_ipv6
;
4697 if (! *last_interface_ip_ptr
) {
4698 tor_addr_t
*a
= tor_malloc_zero(sizeof(tor_addr_t
));
4699 if (get_interface_address6(LOG_INFO
, family
, a
)==0) {
4700 *last_interface_ip_ptr
= a
;
4706 /* If we've used this address previously, we're okay. */
4707 SMARTLIST_FOREACH(outgoing_addrs
, const tor_addr_t
*, a_ptr
,
4708 if (tor_addr_eq(a_ptr
, &out_addr
))
4712 /* Uh-oh. We haven't connected from this address before. Has the interface
4713 * address changed? */
4714 if (get_interface_address6(LOG_INFO
, family
, &iface_addr
)<0)
4717 if (tor_addr_eq(&iface_addr
, *last_interface_ip_ptr
)) {
4718 /* Nope, it hasn't changed. Add this address to the list. */
4719 smartlist_add(outgoing_addrs
, tor_memdup(&out_addr
, sizeof(tor_addr_t
)));
4721 /* The interface changed. We're a client, so we need to regenerate our
4722 * keys. First, reset the state. */
4723 log_notice(LD_NET
, "Our IP address has changed. Rotating keys...");
4724 tor_addr_copy(*last_interface_ip_ptr
, &iface_addr
);
4725 SMARTLIST_FOREACH(outgoing_addrs
, tor_addr_t
*, a_ptr
, tor_free(a_ptr
));
4726 smartlist_clear(outgoing_addrs
);
4727 smartlist_add(outgoing_addrs
, tor_memdup(&out_addr
, sizeof(tor_addr_t
)));
4728 /* We'll need to resolve ourselves again. */
4729 reset_last_resolved_addr();
4730 /* Okay, now change our keys. */
4731 ip_address_changed(1);
4735 /** Some systems have limited system buffers for recv and xmit on
4736 * sockets allocated in a virtual server or similar environment. For a Tor
4737 * server this can produce the "Error creating network socket: No buffer
4738 * space available" error once all available TCP buffer space is consumed.
4739 * This method will attempt to constrain the buffers allocated for the socket
4740 * to the desired size to stay below system TCP buffer limits.
4743 set_constrained_socket_buffers(tor_socket_t sock
, int size
)
4745 void *sz
= (void*)&size
;
4746 socklen_t sz_sz
= (socklen_t
) sizeof(size
);
4747 if (setsockopt(sock
, SOL_SOCKET
, SO_SNDBUF
, sz
, sz_sz
) < 0) {
4748 int e
= tor_socket_errno(sock
);
4749 log_warn(LD_NET
, "setsockopt() to constrain send "
4750 "buffer to %d bytes failed: %s", size
, tor_socket_strerror(e
));
4752 if (setsockopt(sock
, SOL_SOCKET
, SO_RCVBUF
, sz
, sz_sz
) < 0) {
4753 int e
= tor_socket_errno(sock
);
4754 log_warn(LD_NET
, "setsockopt() to constrain recv "
4755 "buffer to %d bytes failed: %s", size
, tor_socket_strerror(e
));
4759 /** Process new bytes that have arrived on conn-\>inbuf.
4761 * This function just passes conn to the connection-specific
4762 * connection_*_process_inbuf() function. It also passes in
4763 * package_partial if wanted.
4766 connection_process_inbuf(connection_t
*conn
, int package_partial
)
4770 switch (conn
->type
) {
4772 return connection_or_process_inbuf(TO_OR_CONN(conn
));
4773 case CONN_TYPE_EXT_OR
:
4774 return connection_ext_or_process_inbuf(TO_OR_CONN(conn
));
4775 case CONN_TYPE_EXIT
:
4777 return connection_edge_process_inbuf(TO_EDGE_CONN(conn
),
4780 return connection_dir_process_inbuf(TO_DIR_CONN(conn
));
4781 case CONN_TYPE_CONTROL
:
4782 return connection_control_process_inbuf(TO_CONTROL_CONN(conn
));
4784 log_err(LD_BUG
,"got unexpected conn type %d.", conn
->type
);
4785 tor_fragile_assert();
4790 /** Called whenever we've written data on a connection. */
4792 connection_flushed_some(connection_t
*conn
)
4795 tor_assert(!conn
->in_flushed_some
);
4796 conn
->in_flushed_some
= 1;
4797 if (conn
->type
== CONN_TYPE_DIR
&&
4798 conn
->state
== DIR_CONN_STATE_SERVER_WRITING
) {
4799 r
= connection_dirserv_flushed_some(TO_DIR_CONN(conn
));
4800 } else if (conn
->type
== CONN_TYPE_OR
) {
4801 r
= connection_or_flushed_some(TO_OR_CONN(conn
));
4802 } else if (CONN_IS_EDGE(conn
)) {
4803 r
= connection_edge_flushed_some(TO_EDGE_CONN(conn
));
4805 conn
->in_flushed_some
= 0;
4809 /** We just finished flushing bytes to the appropriately low network layer,
4810 * and there are no more bytes remaining in conn-\>outbuf or
4811 * conn-\>tls to be flushed.
4813 * This function just passes conn to the connection-specific
4814 * connection_*_finished_flushing() function.
4817 connection_finished_flushing(connection_t
*conn
)
4821 /* If the connection is closed, don't try to do anything more here. */
4822 if (CONN_IS_CLOSED(conn
))
4825 // log_fn(LOG_DEBUG,"entered. Socket %u.", conn->s);
4827 connection_stop_writing(conn
);
4829 switch (conn
->type
) {
4831 return connection_or_finished_flushing(TO_OR_CONN(conn
));
4832 case CONN_TYPE_EXT_OR
:
4833 return connection_ext_or_finished_flushing(TO_OR_CONN(conn
));
4835 case CONN_TYPE_EXIT
:
4836 return connection_edge_finished_flushing(TO_EDGE_CONN(conn
));
4838 return connection_dir_finished_flushing(TO_DIR_CONN(conn
));
4839 case CONN_TYPE_CONTROL
:
4840 return connection_control_finished_flushing(TO_CONTROL_CONN(conn
));
4842 log_err(LD_BUG
,"got unexpected conn type %d.", conn
->type
);
4843 tor_fragile_assert();
4848 /** Called when our attempt to connect() to another server has just
4851 * This function just passes conn to the connection-specific
4852 * connection_*_finished_connecting() function.
4855 connection_finished_connecting(connection_t
*conn
)
4859 if (!server_mode(get_options())) {
4860 /* See whether getsockname() says our address changed. We need to do this
4861 * now that the connection has finished, because getsockname() on Windows
4862 * won't work until then. */
4863 client_check_address_changed(conn
->s
);
4869 return connection_or_finished_connecting(TO_OR_CONN(conn
));
4870 case CONN_TYPE_EXIT
:
4871 return connection_edge_finished_connecting(TO_EDGE_CONN(conn
));
4873 return connection_dir_finished_connecting(TO_DIR_CONN(conn
));
4875 log_err(LD_BUG
,"got unexpected conn type %d.", conn
->type
);
4876 tor_fragile_assert();
4881 /** Callback: invoked when a connection reaches an EOF event. */
4883 connection_reached_eof(connection_t
*conn
)
4885 switch (conn
->type
) {
4887 case CONN_TYPE_EXT_OR
:
4888 return connection_or_reached_eof(TO_OR_CONN(conn
));
4890 case CONN_TYPE_EXIT
:
4891 return connection_edge_reached_eof(TO_EDGE_CONN(conn
));
4893 return connection_dir_reached_eof(TO_DIR_CONN(conn
));
4894 case CONN_TYPE_CONTROL
:
4895 return connection_control_reached_eof(TO_CONTROL_CONN(conn
));
4897 log_err(LD_BUG
,"got unexpected conn type %d.", conn
->type
);
4898 tor_fragile_assert();
4903 /** Comparator for the two-orconn case in OOS victim sort */
4905 oos_victim_comparator_for_orconns(or_connection_t
*a
, or_connection_t
*b
)
4907 int a_circs
, b_circs
;
4908 /* Fewer circuits == higher priority for OOS kill, sort earlier */
4910 a_circs
= connection_or_get_num_circuits(a
);
4911 b_circs
= connection_or_get_num_circuits(b
);
4913 if (a_circs
< b_circs
) return 1;
4914 else if (a_circs
> b_circs
) return -1;
4918 /** Sort comparator for OOS victims; better targets sort before worse
4921 oos_victim_comparator(const void **a_v
, const void **b_v
)
4923 connection_t
*a
= NULL
, *b
= NULL
;
4925 /* Get connection pointers out */
4927 a
= (connection_t
*)(*a_v
);
4928 b
= (connection_t
*)(*b_v
);
4930 tor_assert(a
!= NULL
);
4931 tor_assert(b
!= NULL
);
4934 * We always prefer orconns as victims currently; we won't even see
4935 * these non-orconn cases, but if we do, sort them after orconns.
4937 if (a
->type
== CONN_TYPE_OR
&& b
->type
== CONN_TYPE_OR
) {
4938 return oos_victim_comparator_for_orconns(TO_OR_CONN(a
), TO_OR_CONN(b
));
4941 * One isn't an orconn; if one is, it goes first. We currently have no
4942 * opinions about cases where neither is an orconn.
4944 if (a
->type
== CONN_TYPE_OR
) return -1;
4945 else if (b
->type
== CONN_TYPE_OR
) return 1;
4950 /** Pick n victim connections for the OOS handler and return them in a
4953 MOCK_IMPL(STATIC smartlist_t
*,
4954 pick_oos_victims
, (int n
))
4956 smartlist_t
*eligible
= NULL
, *victims
= NULL
;
4958 int conn_counts_by_type
[CONN_TYPE_MAX_
+ 1], i
;
4961 * Big damn assumption (someone improve this someday!):
4963 * Socket exhaustion normally happens on high-volume relays, and so
4964 * most of the connections involved are orconns. We should pick victims
4965 * by assembling a list of all orconns, and sorting them in order of
4966 * how much 'damage' by some metric we'd be doing by dropping them.
4968 * If we move on from orconns, we should probably think about incoming
4969 * directory connections next, or exit connections. Things we should
4970 * probably never kill are controller connections and listeners.
4972 * This function will count how many connections of different types
4973 * exist and log it for purposes of gathering data on typical OOS
4974 * situations to guide future improvements.
4977 /* First, get the connection array */
4978 conns
= get_connection_array();
4980 * Iterate it and pick out eligible connection types, and log some stats
4983 eligible
= smartlist_new();
4984 memset(conn_counts_by_type
, 0, sizeof(conn_counts_by_type
));
4985 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, c
) {
4986 /* Bump the counter */
4987 tor_assert(c
->type
<= CONN_TYPE_MAX_
);
4988 ++(conn_counts_by_type
[c
->type
]);
4990 /* Skip anything without a socket we can free */
4991 if (!(SOCKET_OK(c
->s
))) {
4995 /* Skip anything we would count as moribund */
4996 if (connection_is_moribund(c
)) {
5002 /* We've got an orconn, it's eligible to be OOSed */
5003 smartlist_add(eligible
, c
);
5006 /* We don't know what to do with it, ignore it */
5009 } SMARTLIST_FOREACH_END(c
);
5011 /* Log some stats */
5012 if (smartlist_len(conns
) > 0) {
5013 /* At least one counter must be non-zero */
5014 log_info(LD_NET
, "Some stats on conn types seen during OOS follow");
5015 for (i
= CONN_TYPE_MIN_
; i
<= CONN_TYPE_MAX_
; ++i
) {
5016 /* Did we see any? */
5017 if (conn_counts_by_type
[i
] > 0) {
5018 log_info(LD_NET
, "%s: %d conns",
5019 conn_type_to_string(i
),
5020 conn_counts_by_type
[i
]);
5023 log_info(LD_NET
, "Done with OOS conn type stats");
5026 /* Did we find more eligible targets than we want to kill? */
5027 if (smartlist_len(eligible
) > n
) {
5028 /* Sort the list in order of target preference */
5029 smartlist_sort(eligible
, oos_victim_comparator
);
5030 /* Pick first n as victims */
5031 victims
= smartlist_new();
5032 for (i
= 0; i
< n
; ++i
) {
5033 smartlist_add(victims
, smartlist_get(eligible
, i
));
5035 /* Free the original list */
5036 smartlist_free(eligible
);
5038 /* No, we can just call them all victims */
5045 /** Kill a list of connections for the OOS handler. */
5046 MOCK_IMPL(STATIC
void,
5047 kill_conn_list_for_oos
, (smartlist_t
*conns
))
5051 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, c
) {
5052 /* Make sure the channel layer gets told about orconns */
5053 if (c
->type
== CONN_TYPE_OR
) {
5054 connection_or_close_for_error(TO_OR_CONN(c
), 1);
5056 connection_mark_for_close(c
);
5058 } SMARTLIST_FOREACH_END(c
);
5061 "OOS handler marked %d connections",
5062 smartlist_len(conns
));
5065 /** Check if a connection is on the way out so the OOS handler doesn't try
5066 * to kill more than it needs. */
5068 connection_is_moribund(connection_t
*conn
)
5071 (conn
->conn_array_index
< 0 ||
5072 conn
->marked_for_close
)) {
5079 /** Out-of-Sockets handler; n_socks is the current number of open
5080 * sockets, and failed is non-zero if a socket exhaustion related
5081 * error immediately preceded this call. This is where to do
5082 * circuit-killing heuristics as needed.
5085 connection_check_oos(int n_socks
, int failed
)
5087 int target_n_socks
= 0, moribund_socks
, socks_to_kill
;
5090 /* Early exit: is OOS checking disabled? */
5091 if (get_options()->DisableOOSCheck
) {
5095 /* Sanity-check args */
5096 tor_assert(n_socks
>= 0);
5099 * Make some log noise; keep it at debug level since this gets a chance
5100 * to run on every connection attempt.
5103 "Running the OOS handler (%d open sockets, %s)",
5104 n_socks
, (failed
!= 0) ? "exhaustion seen" : "no exhaustion");
5107 * Check if we're really handling an OOS condition, and if so decide how
5108 * many sockets we want to get down to. Be sure we check if the threshold
5109 * is distinct from zero first; it's possible for this to be called a few
5110 * times before we've finished reading the config.
5112 if (n_socks
>= get_options()->ConnLimit_high_thresh
&&
5113 get_options()->ConnLimit_high_thresh
!= 0 &&
5114 get_options()->ConnLimit_
!= 0) {
5115 /* Try to get down to the low threshold */
5116 target_n_socks
= get_options()->ConnLimit_low_thresh
;
5118 "Current number of sockets %d is greater than configured "
5119 "limit %d; OOS handler trying to get down to %d",
5120 n_socks
, get_options()->ConnLimit_high_thresh
,
5122 } else if (failed
) {
5124 * If we're not at the limit but we hit a socket exhaustion error, try to
5125 * drop some (but not as aggressively as ConnLimit_low_threshold, which is
5126 * 3/4 of ConnLimit_)
5128 target_n_socks
= (n_socks
* 9) / 10;
5130 "We saw socket exhaustion at %d open sockets; OOS handler "
5131 "trying to get down to %d",
5132 n_socks
, target_n_socks
);
5135 if (target_n_socks
> 0) {
5139 * Count moribund sockets; it's be important that anything we decide
5140 * to get rid of here but don't immediately close get counted as moribund
5141 * on subsequent invocations so we don't try to kill too many things if
5142 * connection_check_oos() gets called multiple times.
5144 moribund_socks
= connection_count_moribund();
5146 if (moribund_socks
< n_socks
- target_n_socks
) {
5147 socks_to_kill
= n_socks
- target_n_socks
- moribund_socks
;
5149 conns
= pick_oos_victims(socks_to_kill
);
5151 kill_conn_list_for_oos(conns
);
5153 "OOS handler killed %d conns", smartlist_len(conns
));
5154 smartlist_free(conns
);
5156 log_notice(LD_NET
, "OOS handler failed to pick any victim conns");
5160 "Not killing any sockets for OOS because there are %d "
5161 "already moribund, and we only want to eliminate %d",
5162 moribund_socks
, n_socks
- target_n_socks
);
5167 /** Log how many bytes are used by buffers of different kinds and sizes. */
5169 connection_dump_buffer_mem_stats(int severity
)
5171 uint64_t used_by_type
[CONN_TYPE_MAX_
+1];
5172 uint64_t alloc_by_type
[CONN_TYPE_MAX_
+1];
5173 int n_conns_by_type
[CONN_TYPE_MAX_
+1];
5174 uint64_t total_alloc
= 0;
5175 uint64_t total_used
= 0;
5177 smartlist_t
*conns
= get_connection_array();
5179 memset(used_by_type
, 0, sizeof(used_by_type
));
5180 memset(alloc_by_type
, 0, sizeof(alloc_by_type
));
5181 memset(n_conns_by_type
, 0, sizeof(n_conns_by_type
));
5183 SMARTLIST_FOREACH_BEGIN(conns
, connection_t
*, c
) {
5185 ++n_conns_by_type
[tp
];
5187 used_by_type
[tp
] += buf_datalen(c
->inbuf
);
5188 alloc_by_type
[tp
] += buf_allocation(c
->inbuf
);
5191 used_by_type
[tp
] += buf_datalen(c
->outbuf
);
5192 alloc_by_type
[tp
] += buf_allocation(c
->outbuf
);
5194 } SMARTLIST_FOREACH_END(c
);
5195 for (i
=0; i
<= CONN_TYPE_MAX_
; ++i
) {
5196 total_used
+= used_by_type
[i
];
5197 total_alloc
+= alloc_by_type
[i
];
5200 tor_log(severity
, LD_GENERAL
,
5201 "In buffers for %d connections: %"PRIu64
" used/%"PRIu64
" allocated",
5202 smartlist_len(conns
),
5203 (total_used
), (total_alloc
));
5204 for (i
=CONN_TYPE_MIN_
; i
<= CONN_TYPE_MAX_
; ++i
) {
5205 if (!n_conns_by_type
[i
])
5207 tor_log(severity
, LD_GENERAL
,
5208 " For %d %s connections: %"PRIu64
" used/%"PRIu64
" allocated",
5209 n_conns_by_type
[i
], conn_type_to_string(i
),
5210 (used_by_type
[i
]), (alloc_by_type
[i
]));
5214 /** Verify that connection <b>conn</b> has all of its invariants
5215 * correct. Trigger an assert if anything is invalid.
5218 assert_connection_ok(connection_t
*conn
, time_t now
)
5220 (void) now
; /* XXXX unused. */
5222 tor_assert(conn
->type
>= CONN_TYPE_MIN_
);
5223 tor_assert(conn
->type
<= CONN_TYPE_MAX_
);
5225 switch (conn
->type
) {
5227 case CONN_TYPE_EXT_OR
:
5228 tor_assert(conn
->magic
== OR_CONNECTION_MAGIC
);
5231 tor_assert(conn
->magic
== ENTRY_CONNECTION_MAGIC
);
5233 case CONN_TYPE_EXIT
:
5234 tor_assert(conn
->magic
== EDGE_CONNECTION_MAGIC
);
5237 tor_assert(conn
->magic
== DIR_CONNECTION_MAGIC
);
5239 case CONN_TYPE_CONTROL
:
5240 tor_assert(conn
->magic
== CONTROL_CONNECTION_MAGIC
);
5242 CASE_ANY_LISTENER_TYPE
:
5243 tor_assert(conn
->magic
== LISTENER_CONNECTION_MAGIC
);
5246 tor_assert(conn
->magic
== BASE_CONNECTION_MAGIC
);
5250 if (conn
->linked_conn
) {
5251 tor_assert(conn
->linked_conn
->linked_conn
== conn
);
5252 tor_assert(conn
->linked
);
5255 tor_assert(!SOCKET_OK(conn
->s
));
5257 if (conn
->outbuf_flushlen
> 0) {
5258 /* With optimistic data, we may have queued data in
5259 * EXIT_CONN_STATE_RESOLVING while the conn is not yet marked to writing.
5261 tor_assert((conn
->type
== CONN_TYPE_EXIT
&&
5262 conn
->state
== EXIT_CONN_STATE_RESOLVING
) ||
5263 connection_is_writing(conn
) ||
5264 conn
->write_blocked_on_bw
||
5265 (CONN_IS_EDGE(conn
) &&
5266 TO_EDGE_CONN(conn
)->edge_blocked_on_circ
));
5269 if (conn
->hold_open_until_flushed
)
5270 tor_assert(conn
->marked_for_close
);
5272 /* XXXX check: read_blocked_on_bw, write_blocked_on_bw, s, conn_array_index,
5273 * marked_for_close. */
5277 buf_assert_ok(conn
->inbuf
);
5279 buf_assert_ok(conn
->outbuf
);
5281 if (conn
->type
== CONN_TYPE_OR
) {
5282 or_connection_t
*or_conn
= TO_OR_CONN(conn
);
5283 if (conn
->state
== OR_CONN_STATE_OPEN
) {
5284 /* tor_assert(conn->bandwidth > 0); */
5285 /* the above isn't necessarily true: if we just did a TLS
5286 * handshake but we didn't recognize the other peer, or it
5287 * gave a bad cert/etc, then we won't have assigned bandwidth,
5288 * yet it will be open. -RD
5290 // tor_assert(conn->read_bucket >= 0);
5292 // tor_assert(conn->addr && conn->port);
5293 tor_assert(conn
->address
);
5294 if (conn
->state
> OR_CONN_STATE_PROXY_HANDSHAKING
)
5295 tor_assert(or_conn
->tls
);
5298 if (CONN_IS_EDGE(conn
)) {
5299 /* XXX unchecked: package window, deliver window. */
5300 if (conn
->type
== CONN_TYPE_AP
) {
5301 entry_connection_t
*entry_conn
= TO_ENTRY_CONN(conn
);
5302 if (entry_conn
->chosen_exit_optional
|| entry_conn
->chosen_exit_retries
)
5303 tor_assert(entry_conn
->chosen_exit_name
);
5305 tor_assert(entry_conn
->socks_request
);
5306 if (conn
->state
== AP_CONN_STATE_OPEN
) {
5307 tor_assert(entry_conn
->socks_request
->has_finished
);
5308 if (!conn
->marked_for_close
) {
5309 tor_assert(ENTRY_TO_EDGE_CONN(entry_conn
)->cpath_layer
);
5310 assert_cpath_layer_ok(ENTRY_TO_EDGE_CONN(entry_conn
)->cpath_layer
);
5314 if (conn
->type
== CONN_TYPE_EXIT
) {
5315 tor_assert(conn
->purpose
== EXIT_PURPOSE_CONNECT
||
5316 conn
->purpose
== EXIT_PURPOSE_RESOLVE
);
5318 } else if (conn
->type
== CONN_TYPE_DIR
) {
5320 /* Purpose is only used for dir and exit types currently */
5321 tor_assert(!conn
->purpose
);
5326 CASE_ANY_LISTENER_TYPE
:
5327 tor_assert(conn
->state
== LISTENER_STATE_READY
);
5330 tor_assert(conn
->state
>= OR_CONN_STATE_MIN_
);
5331 tor_assert(conn
->state
<= OR_CONN_STATE_MAX_
);
5333 case CONN_TYPE_EXT_OR
:
5334 tor_assert(conn
->state
>= EXT_OR_CONN_STATE_MIN_
);
5335 tor_assert(conn
->state
<= EXT_OR_CONN_STATE_MAX_
);
5337 case CONN_TYPE_EXIT
:
5338 tor_assert(conn
->state
>= EXIT_CONN_STATE_MIN_
);
5339 tor_assert(conn
->state
<= EXIT_CONN_STATE_MAX_
);
5340 tor_assert(conn
->purpose
>= EXIT_PURPOSE_MIN_
);
5341 tor_assert(conn
->purpose
<= EXIT_PURPOSE_MAX_
);
5344 tor_assert(conn
->state
>= AP_CONN_STATE_MIN_
);
5345 tor_assert(conn
->state
<= AP_CONN_STATE_MAX_
);
5346 tor_assert(TO_ENTRY_CONN(conn
)->socks_request
);
5349 tor_assert(conn
->state
>= DIR_CONN_STATE_MIN_
);
5350 tor_assert(conn
->state
<= DIR_CONN_STATE_MAX_
);
5351 tor_assert(conn
->purpose
>= DIR_PURPOSE_MIN_
);
5352 tor_assert(conn
->purpose
<= DIR_PURPOSE_MAX_
);
5354 case CONN_TYPE_CONTROL
:
5355 tor_assert(conn
->state
>= CONTROL_CONN_STATE_MIN_
);
5356 tor_assert(conn
->state
<= CONTROL_CONN_STATE_MAX_
);
5363 /** Fills <b>addr</b> and <b>port</b> with the details of the global
5364 * proxy server we are using.
5365 * <b>conn</b> contains the connection we are using the proxy for.
5367 * Return 0 on success, -1 on failure.
5370 get_proxy_addrport(tor_addr_t
*addr
, uint16_t *port
, int *proxy_type
,
5371 const connection_t
*conn
)
5373 const or_options_t
*options
= get_options();
5375 /* Client Transport Plugins can use another proxy, but that should be hidden
5376 * from the rest of tor (as the plugin is responsible for dealing with the
5377 * proxy), check it first, then check the rest of the proxy types to allow
5378 * the config to have unused ClientTransportPlugin entries.
5380 if (options
->ClientTransportPlugin
) {
5381 const transport_t
*transport
= NULL
;
5383 r
= get_transport_by_bridge_addrport(&conn
->addr
, conn
->port
, &transport
);
5386 if (transport
) { /* transport found */
5387 tor_addr_copy(addr
, &transport
->addr
);
5388 *port
= transport
->port
;
5389 *proxy_type
= transport
->socks_version
;
5393 /* Unused ClientTransportPlugin. */
5396 if (options
->HTTPSProxy
) {
5397 tor_addr_copy(addr
, &options
->HTTPSProxyAddr
);
5398 *port
= options
->HTTPSProxyPort
;
5399 *proxy_type
= PROXY_CONNECT
;
5401 } else if (options
->Socks4Proxy
) {
5402 tor_addr_copy(addr
, &options
->Socks4ProxyAddr
);
5403 *port
= options
->Socks4ProxyPort
;
5404 *proxy_type
= PROXY_SOCKS4
;
5406 } else if (options
->Socks5Proxy
) {
5407 tor_addr_copy(addr
, &options
->Socks5ProxyAddr
);
5408 *port
= options
->Socks5ProxyPort
;
5409 *proxy_type
= PROXY_SOCKS5
;
5413 tor_addr_make_unspec(addr
);
5415 *proxy_type
= PROXY_NONE
;
5419 /** Log a failed connection to a proxy server.
5420 * <b>conn</b> is the connection we use the proxy server for. */
5422 log_failed_proxy_connection(connection_t
*conn
)
5424 tor_addr_t proxy_addr
;
5425 uint16_t proxy_port
;
5428 if (get_proxy_addrport(&proxy_addr
, &proxy_port
, &proxy_type
, conn
) != 0)
5429 return; /* if we have no proxy set up, leave this function. */
5432 "The connection to the %s proxy server at %s just failed. "
5433 "Make sure that the proxy server is up and running.",
5434 proxy_type_to_string(proxy_type
),
5435 fmt_addrport(&proxy_addr
, proxy_port
));
5438 /** Return string representation of <b>proxy_type</b>. */
5440 proxy_type_to_string(int proxy_type
)
5442 switch (proxy_type
) {
5443 case PROXY_CONNECT
: return "HTTP";
5444 case PROXY_SOCKS4
: return "SOCKS4";
5445 case PROXY_SOCKS5
: return "SOCKS5";
5446 case PROXY_PLUGGABLE
: return "pluggable transports SOCKS";
5447 case PROXY_NONE
: return "NULL";
5448 default: tor_assert(0);
5450 return NULL
; /*Unreached*/
5453 /** Call connection_free_minimal() on every connection in our array, and
5454 * release all storage held by connection.c.
5456 * Don't do the checks in connection_free(), because they will
5460 connection_free_all(void)
5462 smartlist_t
*conns
= get_connection_array();
5464 /* We don't want to log any messages to controllers. */
5465 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
5466 if (conn
->type
== CONN_TYPE_CONTROL
)
5467 TO_CONTROL_CONN(conn
)->event_mask
= 0);
5469 control_update_global_event_mask();
5471 /* Unlink everything from the identity map. */
5472 connection_or_clear_identity_map();
5473 connection_or_clear_ext_or_id_map();
5475 /* Clear out our list of broken connections */
5476 clear_broken_connection_map(0);
5478 SMARTLIST_FOREACH(conns
, connection_t
*, conn
,
5479 connection_free_minimal(conn
));
5481 if (outgoing_addrs
) {
5482 SMARTLIST_FOREACH(outgoing_addrs
, tor_addr_t
*, addr
, tor_free(addr
));
5483 smartlist_free(outgoing_addrs
);
5484 outgoing_addrs
= NULL
;
5487 tor_free(last_interface_ipv4
);
5488 tor_free(last_interface_ipv6
);
5489 last_recorded_accounting_at
= 0;
5491 mainloop_event_free(reenable_blocked_connections_ev
);
5492 reenable_blocked_connections_is_scheduled
= 0;
5493 memset(&reenable_blocked_connections_delay
, 0, sizeof(struct timeval
));
5496 /** Log a warning, and possibly emit a control event, that <b>received</b> came
5497 * at a skewed time. <b>trusted</b> indicates that the <b>source</b> was one
5498 * that we had more faith in and therefore the warning level should have higher
5502 clock_skew_warning
, (const connection_t
*conn
, long apparent_skew
, int trusted
,
5503 log_domain_mask_t domain
, const char *received
,
5504 const char *source
))
5507 char *ext_source
= NULL
, *warn
= NULL
;
5508 format_time_interval(dbuf
, sizeof(dbuf
), apparent_skew
);
5510 tor_asprintf(&ext_source
, "%s:%s:%d", source
, conn
->address
, conn
->port
);
5512 ext_source
= tor_strdup(source
);
5513 log_fn(trusted
? LOG_WARN
: LOG_INFO
, domain
,
5514 "Received %s with skewed time (%s): "
5515 "It seems that our clock is %s by %s, or that theirs is %s%s. "
5516 "Tor requires an accurate clock to work: please check your time, "
5517 "timezone, and date settings.", received
, ext_source
,
5518 apparent_skew
> 0 ? "ahead" : "behind", dbuf
,
5519 apparent_skew
> 0 ? "behind" : "ahead",
5520 (!conn
|| trusted
) ? "" : ", or they are sending us the wrong time");
5522 control_event_general_status(LOG_WARN
, "CLOCK_SKEW SKEW=%ld SOURCE=%s",
5523 apparent_skew
, ext_source
);
5524 tor_asprintf(&warn
, "Clock skew %ld in %s from %s", apparent_skew
,
5526 control_event_bootstrap_problem(warn
, "CLOCK_SKEW", conn
, 1);
5529 tor_free(ext_source
);