1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* connection.c Client connections
3 *
4 * Copyright (C) 2003 Red Hat, Inc.
5 *
6 * Licensed under the Academic Free License version 2.1
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 *
22 */
23
24 #include <config.h>
25 #include "connection.h"
26 #include "dispatch.h"
27 #include "policy.h"
28 #include "services.h"
29 #include "utils.h"
30 #include "signals.h"
31 #include "expirelist.h"
32 #include "selinux.h"
33 #include <dbus/dbus-list.h>
34 #include <dbus/dbus-hash.h>
35 #include <dbus/dbus-timeout.h>
36
37 /* Trim executed commands to this length; we want to keep logs readable */
38 #define MAX_LOG_COMMAND_LEN 50
39
40 static void bus_connection_remove_transactions (DBusConnection *connection);
41
42 typedef struct
43 {
44 BusExpireItem expire_item;
45
46 DBusConnection *will_get_reply;
47 DBusConnection *will_send_reply;
48
49 dbus_uint32_t reply_serial;
50
51 } BusPendingReply;
52
53 struct BusConnections
54 {
55 int refcount;
56 DBusList *completed; /**< List of all completed connections */
57 int n_completed; /**< Length of completed list */
58 DBusList *incomplete; /**< List of all not-yet-active connections */
59 int n_incomplete; /**< Length of incomplete list */
60 BusContext *context;
61 DBusHashTable *completed_by_user; /**< Number of completed connections for each UID */
62 DBusTimeout *expire_timeout; /**< Timeout for expiring incomplete connections. */
63 int stamp; /**< Incrementing number */
64 BusExpireList *pending_replies; /**< List of pending replies */
65
66 #ifdef DBUS_ENABLE_STATS
67 int total_match_rules;
68 int peak_match_rules;
69 int peak_match_rules_per_conn;
70
71 int total_bus_names;
72 int peak_bus_names;
73 int peak_bus_names_per_conn;
74 #endif
75 };
76
77 static dbus_int32_t connection_data_slot = -1;
78
79 typedef struct
80 {
81 BusConnections *connections;
82 DBusList *link_in_connection_list;
83 DBusConnection *connection;
84 DBusList *services_owned;
85 int n_services_owned;
86 DBusList *match_rules;
87 int n_match_rules;
88 char *name;
89 DBusList *transaction_messages; /**< Stuff we need to send as part of a transaction */
90 DBusMessage *oom_message;
91 DBusPreallocatedSend *oom_preallocated;
92 BusClientPolicy *policy;
93
94 char *cached_loginfo_string;
95 BusSELinuxID *selinux_id;
96
97 long connection_tv_sec; /**< Time when we connected (seconds component) */
98 long connection_tv_usec; /**< Time when we connected (microsec component) */
99 int stamp; /**< connections->stamp last time we were traversed */
100
101 #ifdef DBUS_ENABLE_STATS
102 int peak_match_rules;
103 int peak_bus_names;
104 #endif
105 } BusConnectionData;
106
107 static dbus_bool_t bus_pending_reply_expired (BusExpireList *list,
108 DBusList *link,
109 void *data);
110
111 static void bus_connection_drop_pending_replies (BusConnections *connections,
112 DBusConnection *connection);
113
114 static dbus_bool_t expire_incomplete_timeout (void *data);
115
116 #define BUS_CONNECTION_DATA(connection) (dbus_connection_get_data ((connection), connection_data_slot))
117
118 static DBusLoop*
connection_get_loop(DBusConnection * connection)119 connection_get_loop (DBusConnection *connection)
120 {
121 BusConnectionData *d;
122
123 d = BUS_CONNECTION_DATA (connection);
124
125 return bus_context_get_loop (d->connections->context);
126 }
127
128
129 static int
get_connections_for_uid(BusConnections * connections,dbus_uid_t uid)130 get_connections_for_uid (BusConnections *connections,
131 dbus_uid_t uid)
132 {
133 void *val;
134 int current_count;
135
136 /* val is NULL is 0 when it isn't in the hash yet */
137
138 val = _dbus_hash_table_lookup_uintptr (connections->completed_by_user,
139 uid);
140
141 current_count = _DBUS_POINTER_TO_INT (val);
142
143 return current_count;
144 }
145
146 static dbus_bool_t
adjust_connections_for_uid(BusConnections * connections,dbus_uid_t uid,int adjustment)147 adjust_connections_for_uid (BusConnections *connections,
148 dbus_uid_t uid,
149 int adjustment)
150 {
151 int current_count;
152
153 current_count = get_connections_for_uid (connections, uid);
154
155 _dbus_verbose ("Adjusting connection count for UID " DBUS_UID_FORMAT
156 ": was %d adjustment %d making %d\n",
157 uid, current_count, adjustment, current_count + adjustment);
158
159 _dbus_assert (current_count >= 0);
160
161 current_count += adjustment;
162
163 _dbus_assert (current_count >= 0);
164
165 if (current_count == 0)
166 {
167 _dbus_hash_table_remove_uintptr (connections->completed_by_user, uid);
168 return TRUE;
169 }
170 else
171 {
172 dbus_bool_t retval;
173
174 retval = _dbus_hash_table_insert_uintptr (connections->completed_by_user,
175 uid, _DBUS_INT_TO_POINTER (current_count));
176
177 /* only positive adjustment can fail as otherwise
178 * a hash entry should already exist
179 */
180 _dbus_assert (adjustment > 0 ||
181 (adjustment <= 0 && retval));
182
183 return retval;
184 }
185 }
186
187 void
bus_connection_disconnected(DBusConnection * connection)188 bus_connection_disconnected (DBusConnection *connection)
189 {
190 BusConnectionData *d;
191 BusService *service;
192 BusMatchmaker *matchmaker;
193
194 d = BUS_CONNECTION_DATA (connection);
195 _dbus_assert (d != NULL);
196
197 _dbus_verbose ("%s disconnected, dropping all service ownership and releasing\n",
198 d->name ? d->name : "(inactive)");
199
200 /* Delete our match rules */
201 if (d->n_match_rules > 0)
202 {
203 matchmaker = bus_context_get_matchmaker (d->connections->context);
204 bus_matchmaker_disconnected (matchmaker, connection);
205 }
206
207 /* Drop any service ownership. Unfortunately, this requires
208 * memory allocation and there doesn't seem to be a good way to
209 * handle it other than sleeping; we can't "fail" the operation of
210 * disconnecting a client, and preallocating a broadcast "service is
211 * now gone" message for every client-service pair seems kind of
212 * involved.
213 */
214 while ((service = _dbus_list_get_last (&d->services_owned)))
215 {
216 BusTransaction *transaction;
217 DBusError error;
218
219 retry:
220
221 dbus_error_init (&error);
222
223 while ((transaction = bus_transaction_new (d->connections->context)) == NULL)
224 _dbus_wait_for_memory ();
225
226 if (!bus_service_remove_owner (service, connection,
227 transaction, &error))
228 {
229 _DBUS_ASSERT_ERROR_IS_SET (&error);
230
231 if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY))
232 {
233 dbus_error_free (&error);
234 bus_transaction_cancel_and_free (transaction);
235 _dbus_wait_for_memory ();
236 goto retry;
237 }
238 else
239 {
240 _dbus_verbose ("Failed to remove service owner: %s %s\n",
241 error.name, error.message);
242 _dbus_assert_not_reached ("Removing service owner failed for non-memory-related reason");
243 }
244 }
245
246 bus_transaction_execute_and_free (transaction);
247 }
248
249 bus_dispatch_remove_connection (connection);
250
251 /* no more watching */
252 if (!dbus_connection_set_watch_functions (connection,
253 NULL, NULL, NULL,
254 connection,
255 NULL))
256 _dbus_assert_not_reached ("setting watch functions to NULL failed");
257
258 if (!dbus_connection_set_timeout_functions (connection,
259 NULL, NULL, NULL,
260 connection,
261 NULL))
262 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
263
264 dbus_connection_set_unix_user_function (connection,
265 NULL, NULL, NULL);
266 dbus_connection_set_windows_user_function (connection,
267 NULL, NULL, NULL);
268
269 dbus_connection_set_dispatch_status_function (connection,
270 NULL, NULL, NULL);
271
272 bus_connection_remove_transactions (connection);
273
274 if (d->link_in_connection_list != NULL)
275 {
276 if (d->name != NULL)
277 {
278 unsigned long uid;
279
280 _dbus_list_remove_link (&d->connections->completed, d->link_in_connection_list);
281 d->link_in_connection_list = NULL;
282 d->connections->n_completed -= 1;
283
284 if (dbus_connection_get_unix_user (connection, &uid))
285 {
286 if (!adjust_connections_for_uid (d->connections,
287 uid, -1))
288 _dbus_assert_not_reached ("adjusting downward should never fail");
289 }
290 }
291 else
292 {
293 _dbus_list_remove_link (&d->connections->incomplete, d->link_in_connection_list);
294 d->link_in_connection_list = NULL;
295 d->connections->n_incomplete -= 1;
296 }
297
298 _dbus_assert (d->connections->n_incomplete >= 0);
299 _dbus_assert (d->connections->n_completed >= 0);
300 }
301
302 bus_connection_drop_pending_replies (d->connections, connection);
303
304 /* frees "d" as side effect */
305 dbus_connection_set_data (connection,
306 connection_data_slot,
307 NULL, NULL);
308
309 dbus_connection_unref (connection);
310 }
311
312 static dbus_bool_t
add_connection_watch(DBusWatch * watch,void * data)313 add_connection_watch (DBusWatch *watch,
314 void *data)
315 {
316 DBusConnection *connection = data;
317
318 return _dbus_loop_add_watch (connection_get_loop (connection), watch);
319 }
320
321 static void
remove_connection_watch(DBusWatch * watch,void * data)322 remove_connection_watch (DBusWatch *watch,
323 void *data)
324 {
325 DBusConnection *connection = data;
326
327 _dbus_loop_remove_watch (connection_get_loop (connection), watch);
328 }
329
330 static void
toggle_connection_watch(DBusWatch * watch,void * data)331 toggle_connection_watch (DBusWatch *watch,
332 void *data)
333 {
334 DBusConnection *connection = data;
335
336 _dbus_loop_toggle_watch (connection_get_loop (connection), watch);
337 }
338
339 static dbus_bool_t
add_connection_timeout(DBusTimeout * timeout,void * data)340 add_connection_timeout (DBusTimeout *timeout,
341 void *data)
342 {
343 DBusConnection *connection = data;
344
345 return _dbus_loop_add_timeout (connection_get_loop (connection), timeout);
346 }
347
348 static void
remove_connection_timeout(DBusTimeout * timeout,void * data)349 remove_connection_timeout (DBusTimeout *timeout,
350 void *data)
351 {
352 DBusConnection *connection = data;
353
354 _dbus_loop_remove_timeout (connection_get_loop (connection), timeout);
355 }
356
357 static void
dispatch_status_function(DBusConnection * connection,DBusDispatchStatus new_status,void * data)358 dispatch_status_function (DBusConnection *connection,
359 DBusDispatchStatus new_status,
360 void *data)
361 {
362 DBusLoop *loop = data;
363
364 if (new_status != DBUS_DISPATCH_COMPLETE)
365 {
366 while (!_dbus_loop_queue_dispatch (loop, connection))
367 _dbus_wait_for_memory ();
368 }
369 }
370
371 static dbus_bool_t
allow_unix_user_function(DBusConnection * connection,unsigned long uid,void * data)372 allow_unix_user_function (DBusConnection *connection,
373 unsigned long uid,
374 void *data)
375 {
376 BusConnectionData *d;
377
378 d = BUS_CONNECTION_DATA (connection);
379
380 _dbus_assert (d != NULL);
381
382 return bus_context_allow_unix_user (d->connections->context, uid);
383 }
384
385 static void
free_connection_data(void * data)386 free_connection_data (void *data)
387 {
388 BusConnectionData *d = data;
389
390 /* services_owned should be NULL since we should be disconnected */
391 _dbus_assert (d->services_owned == NULL);
392 _dbus_assert (d->n_services_owned == 0);
393 /* similarly */
394 _dbus_assert (d->transaction_messages == NULL);
395
396 if (d->oom_preallocated)
397 dbus_connection_free_preallocated_send (d->connection, d->oom_preallocated);
398
399 if (d->oom_message)
400 dbus_message_unref (d->oom_message);
401
402 if (d->policy)
403 bus_client_policy_unref (d->policy);
404
405 if (d->selinux_id)
406 bus_selinux_id_unref (d->selinux_id);
407
408 dbus_free (d->cached_loginfo_string);
409
410 dbus_free (d->name);
411
412 dbus_free (d);
413 }
414
415 BusConnections*
bus_connections_new(BusContext * context)416 bus_connections_new (BusContext *context)
417 {
418 BusConnections *connections;
419
420 if (!dbus_connection_allocate_data_slot (&connection_data_slot))
421 goto failed_0;
422
423 connections = dbus_new0 (BusConnections, 1);
424 if (connections == NULL)
425 goto failed_1;
426
427 connections->completed_by_user = _dbus_hash_table_new (DBUS_HASH_UINTPTR,
428 NULL, NULL);
429 if (connections->completed_by_user == NULL)
430 goto failed_2;
431
432 connections->expire_timeout = _dbus_timeout_new (100, /* irrelevant */
433 expire_incomplete_timeout,
434 connections, NULL);
435 if (connections->expire_timeout == NULL)
436 goto failed_3;
437
438 _dbus_timeout_set_enabled (connections->expire_timeout, FALSE);
439
440 connections->pending_replies = bus_expire_list_new (bus_context_get_loop (context),
441 bus_context_get_reply_timeout (context),
442 bus_pending_reply_expired,
443 connections);
444 if (connections->pending_replies == NULL)
445 goto failed_4;
446
447 if (!_dbus_loop_add_timeout (bus_context_get_loop (context),
448 connections->expire_timeout))
449 goto failed_5;
450
451 connections->refcount = 1;
452 connections->context = context;
453
454 return connections;
455
456 failed_5:
457 bus_expire_list_free (connections->pending_replies);
458 failed_4:
459 _dbus_timeout_unref (connections->expire_timeout);
460 failed_3:
461 _dbus_hash_table_unref (connections->completed_by_user);
462 failed_2:
463 dbus_free (connections);
464 failed_1:
465 dbus_connection_free_data_slot (&connection_data_slot);
466 failed_0:
467 return NULL;
468 }
469
470 BusConnections *
bus_connections_ref(BusConnections * connections)471 bus_connections_ref (BusConnections *connections)
472 {
473 _dbus_assert (connections->refcount > 0);
474 connections->refcount += 1;
475
476 return connections;
477 }
478
479 void
bus_connections_unref(BusConnections * connections)480 bus_connections_unref (BusConnections *connections)
481 {
482 _dbus_assert (connections->refcount > 0);
483 connections->refcount -= 1;
484 if (connections->refcount == 0)
485 {
486 /* drop all incomplete */
487 while (connections->incomplete != NULL)
488 {
489 DBusConnection *connection;
490
491 connection = connections->incomplete->data;
492
493 dbus_connection_ref (connection);
494 dbus_connection_close (connection);
495 bus_connection_disconnected (connection);
496 dbus_connection_unref (connection);
497 }
498
499 _dbus_assert (connections->n_incomplete == 0);
500
501 /* drop all real connections */
502 while (connections->completed != NULL)
503 {
504 DBusConnection *connection;
505
506 connection = connections->completed->data;
507
508 dbus_connection_ref (connection);
509 dbus_connection_close (connection);
510 bus_connection_disconnected (connection);
511 dbus_connection_unref (connection);
512 }
513
514 _dbus_assert (connections->n_completed == 0);
515
516 bus_expire_list_free (connections->pending_replies);
517
518 _dbus_loop_remove_timeout (bus_context_get_loop (connections->context),
519 connections->expire_timeout);
520
521 _dbus_timeout_unref (connections->expire_timeout);
522
523 _dbus_hash_table_unref (connections->completed_by_user);
524
525 dbus_free (connections);
526
527 dbus_connection_free_data_slot (&connection_data_slot);
528 }
529 }
530
531 /* Used for logging */
532 static dbus_bool_t
cache_peer_loginfo_string(BusConnectionData * d,DBusConnection * connection)533 cache_peer_loginfo_string (BusConnectionData *d,
534 DBusConnection *connection)
535 {
536 DBusString loginfo_buf;
537 unsigned long uid;
538 unsigned long pid;
539 char *windows_sid;
540 dbus_bool_t prev_added;
541
542 if (!_dbus_string_init (&loginfo_buf))
543 return FALSE;
544
545 prev_added = FALSE;
546 if (dbus_connection_get_unix_user (connection, &uid))
547 {
548 if (!_dbus_string_append_printf (&loginfo_buf, "uid=%ld", uid))
549 goto oom;
550 else
551 prev_added = TRUE;
552 }
553
554 if (dbus_connection_get_unix_process_id (connection, &pid))
555 {
556 if (prev_added)
557 {
558 if (!_dbus_string_append_byte (&loginfo_buf, ' '))
559 goto oom;
560 }
561 if (!_dbus_string_append_printf (&loginfo_buf, "pid=%ld comm=\"", pid))
562 goto oom;
563 /* Ignore errors here; we may not have permissions to read the
564 * proc file. */
565 _dbus_command_for_pid (pid, &loginfo_buf, MAX_LOG_COMMAND_LEN, NULL);
566 if (!_dbus_string_append_byte (&loginfo_buf, '"'))
567 goto oom;
568 }
569
570 if (dbus_connection_get_windows_user (connection, &windows_sid))
571 {
572 dbus_bool_t did_append;
573 did_append = _dbus_string_append_printf (&loginfo_buf,
574 "sid=\"%s\" ", windows_sid);
575 dbus_free (windows_sid);
576 if (!did_append)
577 goto oom;
578 }
579
580 if (!_dbus_string_steal_data (&loginfo_buf, &(d->cached_loginfo_string)))
581 goto oom;
582
583 _dbus_string_free (&loginfo_buf);
584
585 return TRUE;
586 oom:
587 _dbus_string_free (&loginfo_buf);
588 return FALSE;
589 }
590
591 dbus_bool_t
bus_connections_setup_connection(BusConnections * connections,DBusConnection * connection)592 bus_connections_setup_connection (BusConnections *connections,
593 DBusConnection *connection)
594 {
595
596 BusConnectionData *d;
597 dbus_bool_t retval;
598 DBusError error;
599
600
601 d = dbus_new0 (BusConnectionData, 1);
602
603 if (d == NULL)
604 return FALSE;
605
606 d->connections = connections;
607 d->connection = connection;
608
609 _dbus_get_monotonic_time (&d->connection_tv_sec,
610 &d->connection_tv_usec);
611
612 _dbus_assert (connection_data_slot >= 0);
613
614 if (!dbus_connection_set_data (connection,
615 connection_data_slot,
616 d, free_connection_data))
617 {
618 dbus_free (d);
619 return FALSE;
620 }
621
622 dbus_connection_set_route_peer_messages (connection, TRUE);
623
624 retval = FALSE;
625
626 dbus_error_init (&error);
627 d->selinux_id = bus_selinux_init_connection_id (connection,
628 &error);
629 if (dbus_error_is_set (&error))
630 {
631 /* This is a bit bogus because we pretend all errors
632 * are OOM; this is done because we know that in bus.c
633 * an OOM error disconnects the connection, which is
634 * the same thing we want on any other error.
635 */
636 dbus_error_free (&error);
637 goto out;
638 }
639
640 if (!dbus_connection_set_watch_functions (connection,
641 add_connection_watch,
642 remove_connection_watch,
643 toggle_connection_watch,
644 connection,
645 NULL))
646 goto out;
647
648 if (!dbus_connection_set_timeout_functions (connection,
649 add_connection_timeout,
650 remove_connection_timeout,
651 NULL,
652 connection, NULL))
653 goto out;
654
655 /* For now we don't need to set a Windows user function because
656 * there are no policies in the config file controlling what
657 * Windows users can connect. The default 'same user that owns the
658 * bus can connect' behavior of DBusConnection is fine on Windows.
659 */
660 dbus_connection_set_unix_user_function (connection,
661 allow_unix_user_function,
662 NULL, NULL);
663
664 dbus_connection_set_dispatch_status_function (connection,
665 dispatch_status_function,
666 bus_context_get_loop (connections->context),
667 NULL);
668
669 d->link_in_connection_list = _dbus_list_alloc_link (connection);
670 if (d->link_in_connection_list == NULL)
671 goto out;
672
673 /* Setup the connection with the dispatcher */
674 if (!bus_dispatch_add_connection (connection))
675 goto out;
676
677 if (dbus_connection_get_dispatch_status (connection) != DBUS_DISPATCH_COMPLETE)
678 {
679 if (!_dbus_loop_queue_dispatch (bus_context_get_loop (connections->context), connection))
680 {
681 bus_dispatch_remove_connection (connection);
682 goto out;
683 }
684 }
685
686 _dbus_list_append_link (&connections->incomplete, d->link_in_connection_list);
687 connections->n_incomplete += 1;
688
689 dbus_connection_ref (connection);
690
691 /* Note that we might disconnect ourselves here, but it only takes
692 * effect on return to the main loop. We call this to free up
693 * expired connections if possible, and to queue the timeout for our
694 * own expiration.
695 */
696 bus_connections_expire_incomplete (connections);
697
698 /* And we might also disconnect ourselves here, but again it
699 * only takes effect on return to main loop.
700 */
701 if (connections->n_incomplete >
702 bus_context_get_max_incomplete_connections (connections->context))
703 {
704 _dbus_verbose ("Number of incomplete connections exceeds max, dropping oldest one\n");
705
706 _dbus_assert (connections->incomplete != NULL);
707 /* Disconnect the oldest unauthenticated connection. FIXME
708 * would it be more secure to drop a *random* connection? This
709 * algorithm seems to mean that if someone can create new
710 * connections quickly enough, they can keep anyone else from
711 * completing authentication. But random may or may not really
712 * help with that, a more elaborate solution might be required.
713 */
714 dbus_connection_close (connections->incomplete->data);
715 }
716
717 retval = TRUE;
718
719 out:
720 if (!retval)
721 {
722 if (d->selinux_id)
723 bus_selinux_id_unref (d->selinux_id);
724 d->selinux_id = NULL;
725
726 if (!dbus_connection_set_watch_functions (connection,
727 NULL, NULL, NULL,
728 connection,
729 NULL))
730 _dbus_assert_not_reached ("setting watch functions to NULL failed");
731
732 if (!dbus_connection_set_timeout_functions (connection,
733 NULL, NULL, NULL,
734 connection,
735 NULL))
736 _dbus_assert_not_reached ("setting timeout functions to NULL failed");
737
738 dbus_connection_set_unix_user_function (connection,
739 NULL, NULL, NULL);
740
741 dbus_connection_set_windows_user_function (connection,
742 NULL, NULL, NULL);
743
744 dbus_connection_set_dispatch_status_function (connection,
745 NULL, NULL, NULL);
746
747 if (d->link_in_connection_list != NULL)
748 {
749 _dbus_assert (d->link_in_connection_list->next == NULL);
750 _dbus_assert (d->link_in_connection_list->prev == NULL);
751 _dbus_list_free_link (d->link_in_connection_list);
752 d->link_in_connection_list = NULL;
753 }
754
755 if (!dbus_connection_set_data (connection,
756 connection_data_slot,
757 NULL, NULL))
758 _dbus_assert_not_reached ("failed to set connection data to null");
759
760 /* "d" has now been freed */
761 }
762
763 return retval;
764 }
765
766 void
bus_connections_expire_incomplete(BusConnections * connections)767 bus_connections_expire_incomplete (BusConnections *connections)
768 {
769 int next_interval;
770
771 next_interval = -1;
772
773 if (connections->incomplete != NULL)
774 {
775 long tv_sec, tv_usec;
776 DBusList *link;
777 int auth_timeout;
778
779 _dbus_get_monotonic_time (&tv_sec, &tv_usec);
780 auth_timeout = bus_context_get_auth_timeout (connections->context);
781
782 link = _dbus_list_get_first_link (&connections->incomplete);
783 while (link != NULL)
784 {
785 DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
786 DBusConnection *connection;
787 BusConnectionData *d;
788 double elapsed;
789
790 connection = link->data;
791
792 d = BUS_CONNECTION_DATA (connection);
793
794 _dbus_assert (d != NULL);
795
796 elapsed = ELAPSED_MILLISECONDS_SINCE (d->connection_tv_sec,
797 d->connection_tv_usec,
798 tv_sec, tv_usec);
799
800 if (elapsed >= (double) auth_timeout)
801 {
802 _dbus_verbose ("Timing out authentication for connection %p\n", connection);
803 dbus_connection_close (connection);
804 }
805 else
806 {
807 /* We can end the loop, since the connections are in oldest-first order */
808 next_interval = ((double)auth_timeout) - elapsed;
809 _dbus_verbose ("Connection %p authentication expires in %d milliseconds\n",
810 connection, next_interval);
811
812 break;
813 }
814
815 link = next;
816 }
817 }
818
819 bus_expire_timeout_set_interval (connections->expire_timeout,
820 next_interval);
821 }
822
823 static dbus_bool_t
expire_incomplete_timeout(void * data)824 expire_incomplete_timeout (void *data)
825 {
826 BusConnections *connections = data;
827
828 _dbus_verbose ("Running\n");
829
830 /* note that this may remove the timeout */
831 bus_connections_expire_incomplete (connections);
832
833 return TRUE;
834 }
835
836 dbus_bool_t
bus_connection_get_unix_groups(DBusConnection * connection,unsigned long ** groups,int * n_groups,DBusError * error)837 bus_connection_get_unix_groups (DBusConnection *connection,
838 unsigned long **groups,
839 int *n_groups,
840 DBusError *error)
841 {
842 unsigned long uid;
843
844 *groups = NULL;
845 *n_groups = 0;
846
847 if (dbus_connection_get_unix_user (connection, &uid))
848 {
849 if (!_dbus_unix_groups_from_uid (uid, groups, n_groups))
850 {
851 _dbus_verbose ("Did not get any groups for UID %lu\n",
852 uid);
853 return FALSE;
854 }
855 else
856 {
857 _dbus_verbose ("Got %d groups for UID %lu\n",
858 *n_groups, uid);
859 return TRUE;
860 }
861 }
862 else
863 return TRUE; /* successfully got 0 groups */
864 }
865
866 dbus_bool_t
bus_connection_is_in_unix_group(DBusConnection * connection,unsigned long gid)867 bus_connection_is_in_unix_group (DBusConnection *connection,
868 unsigned long gid)
869 {
870 int i;
871 unsigned long *group_ids;
872 int n_group_ids;
873
874 if (!bus_connection_get_unix_groups (connection, &group_ids, &n_group_ids,
875 NULL))
876 return FALSE;
877
878 i = 0;
879 while (i < n_group_ids)
880 {
881 if (group_ids[i] == gid)
882 {
883 dbus_free (group_ids);
884 return TRUE;
885 }
886 ++i;
887 }
888
889 dbus_free (group_ids);
890 return FALSE;
891 }
892
893 const char *
bus_connection_get_loginfo(DBusConnection * connection)894 bus_connection_get_loginfo (DBusConnection *connection)
895 {
896 BusConnectionData *d;
897
898 d = BUS_CONNECTION_DATA (connection);
899
900 if (!bus_connection_is_active (connection))
901 return "inactive";
902 return d->cached_loginfo_string;
903 }
904
905 BusClientPolicy*
bus_connection_get_policy(DBusConnection * connection)906 bus_connection_get_policy (DBusConnection *connection)
907 {
908 BusConnectionData *d;
909
910 d = BUS_CONNECTION_DATA (connection);
911
912 _dbus_assert (d != NULL);
913 _dbus_assert (d->policy != NULL);
914
915 return d->policy;
916 }
917
918 static dbus_bool_t
foreach_active(BusConnections * connections,BusConnectionForeachFunction function,void * data)919 foreach_active (BusConnections *connections,
920 BusConnectionForeachFunction function,
921 void *data)
922 {
923 DBusList *link;
924
925 link = _dbus_list_get_first_link (&connections->completed);
926 while (link != NULL)
927 {
928 DBusConnection *connection = link->data;
929 DBusList *next = _dbus_list_get_next_link (&connections->completed, link);
930
931 if (!(* function) (connection, data))
932 return FALSE;
933
934 link = next;
935 }
936
937 return TRUE;
938 }
939
940 static dbus_bool_t
foreach_inactive(BusConnections * connections,BusConnectionForeachFunction function,void * data)941 foreach_inactive (BusConnections *connections,
942 BusConnectionForeachFunction function,
943 void *data)
944 {
945 DBusList *link;
946
947 link = _dbus_list_get_first_link (&connections->incomplete);
948 while (link != NULL)
949 {
950 DBusConnection *connection = link->data;
951 DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
952
953 if (!(* function) (connection, data))
954 return FALSE;
955
956 link = next;
957 }
958
959 return TRUE;
960 }
961
962 /**
963 * Calls function on each active connection; if the function returns
964 * #FALSE, stops iterating. Active connections are authenticated
965 * and have sent a Hello message.
966 *
967 * @param connections the connections object
968 * @param function the function
969 * @param data data to pass to it as a second arg
970 */
971 void
bus_connections_foreach_active(BusConnections * connections,BusConnectionForeachFunction function,void * data)972 bus_connections_foreach_active (BusConnections *connections,
973 BusConnectionForeachFunction function,
974 void *data)
975 {
976 foreach_active (connections, function, data);
977 }
978
979 /**
980 * Calls function on each connection; if the function returns
981 * #FALSE, stops iterating.
982 *
983 * @param connections the connections object
984 * @param function the function
985 * @param data data to pass to it as a second arg
986 */
987 void
bus_connections_foreach(BusConnections * connections,BusConnectionForeachFunction function,void * data)988 bus_connections_foreach (BusConnections *connections,
989 BusConnectionForeachFunction function,
990 void *data)
991 {
992 if (!foreach_active (connections, function, data))
993 return;
994
995 foreach_inactive (connections, function, data);
996 }
997
998 BusContext*
bus_connections_get_context(BusConnections * connections)999 bus_connections_get_context (BusConnections *connections)
1000 {
1001 return connections->context;
1002 }
1003
1004 /*
1005 * This is used to avoid covering the same connection twice when
1006 * traversing connections. Note that it assumes we will
1007 * bus_connection_mark_stamp() each connection at least once per
1008 * INT_MAX increments of the global stamp, or wraparound would break
1009 * things.
1010 */
1011 void
bus_connections_increment_stamp(BusConnections * connections)1012 bus_connections_increment_stamp (BusConnections *connections)
1013 {
1014 connections->stamp += 1;
1015 }
1016
1017 /* Mark connection with current stamp, return TRUE if it
1018 * didn't already have that stamp
1019 */
1020 dbus_bool_t
bus_connection_mark_stamp(DBusConnection * connection)1021 bus_connection_mark_stamp (DBusConnection *connection)
1022 {
1023 BusConnectionData *d;
1024
1025 d = BUS_CONNECTION_DATA (connection);
1026
1027 _dbus_assert (d != NULL);
1028
1029 if (d->stamp == d->connections->stamp)
1030 return FALSE;
1031 else
1032 {
1033 d->stamp = d->connections->stamp;
1034 return TRUE;
1035 }
1036 }
1037
1038 BusContext*
bus_connection_get_context(DBusConnection * connection)1039 bus_connection_get_context (DBusConnection *connection)
1040 {
1041 BusConnectionData *d;
1042
1043 d = BUS_CONNECTION_DATA (connection);
1044
1045 _dbus_assert (d != NULL);
1046
1047 return d->connections->context;
1048 }
1049
1050 BusConnections*
bus_connection_get_connections(DBusConnection * connection)1051 bus_connection_get_connections (DBusConnection *connection)
1052 {
1053 BusConnectionData *d;
1054
1055 d = BUS_CONNECTION_DATA (connection);
1056
1057 _dbus_assert (d != NULL);
1058
1059 return d->connections;
1060 }
1061
1062 BusRegistry*
bus_connection_get_registry(DBusConnection * connection)1063 bus_connection_get_registry (DBusConnection *connection)
1064 {
1065 BusConnectionData *d;
1066
1067 d = BUS_CONNECTION_DATA (connection);
1068
1069 _dbus_assert (d != NULL);
1070
1071 return bus_context_get_registry (d->connections->context);
1072 }
1073
1074 BusActivation*
bus_connection_get_activation(DBusConnection * connection)1075 bus_connection_get_activation (DBusConnection *connection)
1076 {
1077 BusConnectionData *d;
1078
1079 d = BUS_CONNECTION_DATA (connection);
1080
1081 _dbus_assert (d != NULL);
1082
1083 return bus_context_get_activation (d->connections->context);
1084 }
1085
1086 BusMatchmaker*
bus_connection_get_matchmaker(DBusConnection * connection)1087 bus_connection_get_matchmaker (DBusConnection *connection)
1088 {
1089 BusConnectionData *d;
1090
1091 d = BUS_CONNECTION_DATA (connection);
1092
1093 _dbus_assert (d != NULL);
1094
1095 return bus_context_get_matchmaker (d->connections->context);
1096 }
1097
1098 BusSELinuxID*
bus_connection_get_selinux_id(DBusConnection * connection)1099 bus_connection_get_selinux_id (DBusConnection *connection)
1100 {
1101 BusConnectionData *d;
1102
1103 d = BUS_CONNECTION_DATA (connection);
1104
1105 _dbus_assert (d != NULL);
1106
1107 return d->selinux_id;
1108 }
1109
1110 /**
1111 * Checks whether the connection is registered with the message bus.
1112 *
1113 * @param connection the connection
1114 * @returns #TRUE if we're an active message bus participant
1115 */
1116 dbus_bool_t
bus_connection_is_active(DBusConnection * connection)1117 bus_connection_is_active (DBusConnection *connection)
1118 {
1119 BusConnectionData *d;
1120
1121 d = BUS_CONNECTION_DATA (connection);
1122
1123 return d != NULL && d->name != NULL;
1124 }
1125
1126 dbus_bool_t
bus_connection_preallocate_oom_error(DBusConnection * connection)1127 bus_connection_preallocate_oom_error (DBusConnection *connection)
1128 {
1129 DBusMessage *message;
1130 DBusPreallocatedSend *preallocated;
1131 BusConnectionData *d;
1132
1133 d = BUS_CONNECTION_DATA (connection);
1134
1135 _dbus_assert (d != NULL);
1136
1137 if (d->oom_preallocated != NULL)
1138 return TRUE;
1139
1140 preallocated = dbus_connection_preallocate_send (connection);
1141 if (preallocated == NULL)
1142 return FALSE;
1143
1144 message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1145
1146 if (message == NULL)
1147 {
1148 dbus_connection_free_preallocated_send (connection, preallocated);
1149 return FALSE;
1150 }
1151
1152 /* d->name may be NULL, but that is OK */
1153 if (!dbus_message_set_error_name (message, DBUS_ERROR_NO_MEMORY) ||
1154 !dbus_message_set_destination (message, d->name) ||
1155 !dbus_message_set_sender (message,
1156 DBUS_SERVICE_DBUS))
1157 {
1158 dbus_connection_free_preallocated_send (connection, preallocated);
1159 dbus_message_unref (message);
1160 return FALSE;
1161 }
1162
1163 /* set reply serial to placeholder value just so space is already allocated
1164 * for it.
1165 */
1166 if (!dbus_message_set_reply_serial (message, 14))
1167 {
1168 dbus_connection_free_preallocated_send (connection, preallocated);
1169 dbus_message_unref (message);
1170 return FALSE;
1171 }
1172
1173 d->oom_message = message;
1174 d->oom_preallocated = preallocated;
1175
1176 return TRUE;
1177 }
1178
1179 void
bus_connection_send_oom_error(DBusConnection * connection,DBusMessage * in_reply_to)1180 bus_connection_send_oom_error (DBusConnection *connection,
1181 DBusMessage *in_reply_to)
1182 {
1183 BusConnectionData *d;
1184
1185 d = BUS_CONNECTION_DATA (connection);
1186
1187 _dbus_assert (d != NULL);
1188 _dbus_assert (d->oom_message != NULL);
1189
1190 /* should always succeed since we set it to a placeholder earlier */
1191 if (!dbus_message_set_reply_serial (d->oom_message,
1192 dbus_message_get_serial (in_reply_to)))
1193 _dbus_assert_not_reached ("Failed to set reply serial for preallocated oom message");
1194
1195 _dbus_assert (dbus_message_get_sender (d->oom_message) != NULL);
1196
1197 dbus_connection_send_preallocated (connection, d->oom_preallocated,
1198 d->oom_message, NULL);
1199
1200 dbus_message_unref (d->oom_message);
1201 d->oom_message = NULL;
1202 d->oom_preallocated = NULL;
1203 }
1204
1205 #ifdef DBUS_ENABLE_STATS
1206 static void
update_peak(int * peak,int n)1207 update_peak (int *peak,
1208 int n)
1209 {
1210 if (*peak < n)
1211 *peak = n;
1212 }
1213 #endif
1214
1215 void
bus_connection_add_match_rule_link(DBusConnection * connection,DBusList * link)1216 bus_connection_add_match_rule_link (DBusConnection *connection,
1217 DBusList *link)
1218 {
1219 BusConnectionData *d;
1220
1221 d = BUS_CONNECTION_DATA (connection);
1222 _dbus_assert (d != NULL);
1223
1224 _dbus_list_append_link (&d->match_rules, link);
1225
1226 d->n_match_rules += 1;
1227
1228 #ifdef DBUS_ENABLE_STATS
1229 update_peak (&d->peak_match_rules, d->n_match_rules);
1230 update_peak (&d->connections->peak_match_rules_per_conn, d->n_match_rules);
1231
1232 d->connections->total_match_rules += 1;
1233 update_peak (&d->connections->peak_match_rules,
1234 d->connections->total_match_rules);
1235 #endif
1236 }
1237
1238 dbus_bool_t
bus_connection_add_match_rule(DBusConnection * connection,BusMatchRule * rule)1239 bus_connection_add_match_rule (DBusConnection *connection,
1240 BusMatchRule *rule)
1241 {
1242 DBusList *link;
1243
1244 link = _dbus_list_alloc_link (rule);
1245
1246 if (link == NULL)
1247 return FALSE;
1248
1249 bus_connection_add_match_rule_link (connection, link);
1250
1251 return TRUE;
1252 }
1253
1254 void
bus_connection_remove_match_rule(DBusConnection * connection,BusMatchRule * rule)1255 bus_connection_remove_match_rule (DBusConnection *connection,
1256 BusMatchRule *rule)
1257 {
1258 BusConnectionData *d;
1259
1260 d = BUS_CONNECTION_DATA (connection);
1261 _dbus_assert (d != NULL);
1262
1263 _dbus_list_remove_last (&d->match_rules, rule);
1264
1265 d->n_match_rules -= 1;
1266 _dbus_assert (d->n_match_rules >= 0);
1267
1268 #ifdef DBUS_ENABLE_STATS
1269 d->connections->total_match_rules -= 1;
1270 #endif
1271 }
1272
1273 int
bus_connection_get_n_match_rules(DBusConnection * connection)1274 bus_connection_get_n_match_rules (DBusConnection *connection)
1275 {
1276 BusConnectionData *d;
1277
1278 d = BUS_CONNECTION_DATA (connection);
1279 _dbus_assert (d != NULL);
1280
1281 return d->n_match_rules;
1282 }
1283
1284 void
bus_connection_add_owned_service_link(DBusConnection * connection,DBusList * link)1285 bus_connection_add_owned_service_link (DBusConnection *connection,
1286 DBusList *link)
1287 {
1288 BusConnectionData *d;
1289
1290 d = BUS_CONNECTION_DATA (connection);
1291 _dbus_assert (d != NULL);
1292
1293 _dbus_list_append_link (&d->services_owned, link);
1294
1295 d->n_services_owned += 1;
1296
1297 #ifdef DBUS_ENABLE_STATS
1298 update_peak (&d->peak_bus_names, d->n_services_owned);
1299 update_peak (&d->connections->peak_bus_names_per_conn,
1300 d->n_services_owned);
1301
1302 d->connections->total_bus_names += 1;
1303 update_peak (&d->connections->peak_bus_names,
1304 d->connections->total_bus_names);
1305 #endif
1306 }
1307
1308 dbus_bool_t
bus_connection_add_owned_service(DBusConnection * connection,BusService * service)1309 bus_connection_add_owned_service (DBusConnection *connection,
1310 BusService *service)
1311 {
1312 DBusList *link;
1313
1314 link = _dbus_list_alloc_link (service);
1315
1316 if (link == NULL)
1317 return FALSE;
1318
1319 bus_connection_add_owned_service_link (connection, link);
1320
1321 return TRUE;
1322 }
1323
1324 void
bus_connection_remove_owned_service(DBusConnection * connection,BusService * service)1325 bus_connection_remove_owned_service (DBusConnection *connection,
1326 BusService *service)
1327 {
1328 BusConnectionData *d;
1329
1330 d = BUS_CONNECTION_DATA (connection);
1331 _dbus_assert (d != NULL);
1332
1333 _dbus_list_remove_last (&d->services_owned, service);
1334
1335 d->n_services_owned -= 1;
1336 _dbus_assert (d->n_services_owned >= 0);
1337
1338 #ifdef DBUS_ENABLE_STATS
1339 d->connections->total_bus_names -= 1;
1340 #endif
1341 }
1342
1343 int
bus_connection_get_n_services_owned(DBusConnection * connection)1344 bus_connection_get_n_services_owned (DBusConnection *connection)
1345 {
1346 BusConnectionData *d;
1347
1348 d = BUS_CONNECTION_DATA (connection);
1349 _dbus_assert (d != NULL);
1350
1351 return d->n_services_owned;
1352 }
1353
1354 dbus_bool_t
bus_connection_complete(DBusConnection * connection,const DBusString * name,DBusError * error)1355 bus_connection_complete (DBusConnection *connection,
1356 const DBusString *name,
1357 DBusError *error)
1358 {
1359 BusConnectionData *d;
1360 unsigned long uid;
1361
1362 d = BUS_CONNECTION_DATA (connection);
1363 _dbus_assert (d != NULL);
1364 _dbus_assert (d->name == NULL);
1365 _dbus_assert (d->policy == NULL);
1366
1367 _dbus_assert (!bus_connection_is_active (connection));
1368
1369 if (!_dbus_string_copy_data (name, &d->name))
1370 {
1371 BUS_SET_OOM (error);
1372 return FALSE;
1373 }
1374
1375 _dbus_assert (d->name != NULL);
1376
1377 _dbus_verbose ("Name %s assigned to %p\n", d->name, connection);
1378
1379 d->policy = bus_context_create_client_policy (d->connections->context,
1380 connection,
1381 error);
1382
1383 /* we may have a NULL policy on OOM or error getting list of
1384 * groups for a user. In the latter case we don't handle it so
1385 * well currently, as it will just keep failing over and over.
1386 */
1387
1388 if (d->policy == NULL)
1389 {
1390 _dbus_verbose ("Failed to create security policy for connection %p\n",
1391 connection);
1392 _DBUS_ASSERT_ERROR_IS_SET (error);
1393 dbus_free (d->name);
1394 d->name = NULL;
1395 return FALSE;
1396 }
1397
1398 if (dbus_connection_get_unix_user (connection, &uid))
1399 {
1400 if (!adjust_connections_for_uid (d->connections,
1401 uid, 1))
1402 goto fail;
1403 }
1404
1405 /* Create and cache a string which holds information about the
1406 * peer process; used for logging purposes.
1407 */
1408 if (!cache_peer_loginfo_string (d, connection))
1409 goto fail;
1410
1411 /* Now the connection is active, move it between lists */
1412 _dbus_list_unlink (&d->connections->incomplete,
1413 d->link_in_connection_list);
1414 d->connections->n_incomplete -= 1;
1415 _dbus_list_append_link (&d->connections->completed,
1416 d->link_in_connection_list);
1417 d->connections->n_completed += 1;
1418
1419 _dbus_assert (d->connections->n_incomplete >= 0);
1420 _dbus_assert (d->connections->n_completed > 0);
1421
1422 /* See if we can remove the timeout */
1423 bus_connections_expire_incomplete (d->connections);
1424
1425 _dbus_assert (bus_connection_is_active (connection));
1426
1427 return TRUE;
1428 fail:
1429 BUS_SET_OOM (error);
1430 dbus_free (d->name);
1431 d->name = NULL;
1432 if (d->policy)
1433 bus_client_policy_unref (d->policy);
1434 d->policy = NULL;
1435 return FALSE;
1436 }
1437
1438 const char *
bus_connection_get_name(DBusConnection * connection)1439 bus_connection_get_name (DBusConnection *connection)
1440 {
1441 BusConnectionData *d;
1442
1443 d = BUS_CONNECTION_DATA (connection);
1444 _dbus_assert (d != NULL);
1445
1446 return d->name;
1447 }
1448
1449 /**
1450 * Check whether completing the passed-in connection would
1451 * exceed limits, and if so set error and return #FALSE
1452 */
1453 dbus_bool_t
bus_connections_check_limits(BusConnections * connections,DBusConnection * requesting_completion,DBusError * error)1454 bus_connections_check_limits (BusConnections *connections,
1455 DBusConnection *requesting_completion,
1456 DBusError *error)
1457 {
1458 unsigned long uid;
1459
1460 if (connections->n_completed >=
1461 bus_context_get_max_completed_connections (connections->context))
1462 {
1463 dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1464 "The maximum number of active connections has been reached");
1465 return FALSE;
1466 }
1467
1468 if (dbus_connection_get_unix_user (requesting_completion, &uid))
1469 {
1470 if (get_connections_for_uid (connections, uid) >=
1471 bus_context_get_max_connections_per_user (connections->context))
1472 {
1473 dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1474 "The maximum number of active connections for UID %lu has been reached",
1475 uid);
1476 return FALSE;
1477 }
1478 }
1479
1480 return TRUE;
1481 }
1482
1483 static void
bus_pending_reply_free(BusPendingReply * pending)1484 bus_pending_reply_free (BusPendingReply *pending)
1485 {
1486 _dbus_verbose ("Freeing pending reply %p, replier %p receiver %p serial %u\n",
1487 pending,
1488 pending->will_send_reply,
1489 pending->will_get_reply,
1490 pending->reply_serial);
1491
1492 dbus_free (pending);
1493 }
1494
1495 static dbus_bool_t
bus_pending_reply_send_no_reply(BusConnections * connections,BusTransaction * transaction,BusPendingReply * pending)1496 bus_pending_reply_send_no_reply (BusConnections *connections,
1497 BusTransaction *transaction,
1498 BusPendingReply *pending)
1499 {
1500 DBusMessage *message;
1501 DBusMessageIter iter;
1502 dbus_bool_t retval;
1503 const char *errmsg;
1504
1505 retval = FALSE;
1506
1507 message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1508 if (message == NULL)
1509 return FALSE;
1510
1511 dbus_message_set_no_reply (message, TRUE);
1512
1513 if (!dbus_message_set_reply_serial (message,
1514 pending->reply_serial))
1515 goto out;
1516
1517 if (!dbus_message_set_error_name (message,
1518 DBUS_ERROR_NO_REPLY))
1519 goto out;
1520
1521 errmsg = "Message did not receive a reply (timeout by message bus)";
1522 dbus_message_iter_init_append (message, &iter);
1523 if (!dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &errmsg))
1524 goto out;
1525
1526 if (!bus_transaction_send_from_driver (transaction, pending->will_get_reply,
1527 message))
1528 goto out;
1529
1530 retval = TRUE;
1531
1532 out:
1533 dbus_message_unref (message);
1534 return retval;
1535 }
1536
1537 static dbus_bool_t
bus_pending_reply_expired(BusExpireList * list,DBusList * link,void * data)1538 bus_pending_reply_expired (BusExpireList *list,
1539 DBusList *link,
1540 void *data)
1541 {
1542 BusPendingReply *pending = link->data;
1543 BusConnections *connections = data;
1544 BusTransaction *transaction;
1545
1546 /* No reply is forthcoming. So nuke it if we can. If not,
1547 * leave it in the list to try expiring again later when we
1548 * get more memory.
1549 */
1550
1551 _dbus_verbose ("Expiring pending reply %p, replier %p receiver %p serial %u\n",
1552 pending,
1553 pending->will_send_reply,
1554 pending->will_get_reply,
1555 pending->reply_serial);
1556
1557 transaction = bus_transaction_new (connections->context);
1558 if (transaction == NULL)
1559 return FALSE;
1560
1561 if (!bus_pending_reply_send_no_reply (connections,
1562 transaction,
1563 pending))
1564 {
1565 bus_transaction_cancel_and_free (transaction);
1566 return FALSE;
1567 }
1568
1569 bus_expire_list_remove_link (connections->pending_replies, link);
1570
1571 bus_pending_reply_free (pending);
1572 bus_transaction_execute_and_free (transaction);
1573
1574 return TRUE;
1575 }
1576
1577 static void
bus_connection_drop_pending_replies(BusConnections * connections,DBusConnection * connection)1578 bus_connection_drop_pending_replies (BusConnections *connections,
1579 DBusConnection *connection)
1580 {
1581 /* The DBusConnection is almost 100% finalized here, so you can't
1582 * do anything with it except check for pointer equality
1583 */
1584 DBusList *link;
1585
1586 _dbus_verbose ("Dropping pending replies that involve connection %p\n",
1587 connection);
1588
1589 link = bus_expire_list_get_first_link (connections->pending_replies);
1590 while (link != NULL)
1591 {
1592 DBusList *next;
1593 BusPendingReply *pending;
1594
1595 next = bus_expire_list_get_next_link (connections->pending_replies,
1596 link);
1597 pending = link->data;
1598
1599 if (pending->will_get_reply == connection)
1600 {
1601 /* We don't need to track this pending reply anymore */
1602
1603 _dbus_verbose ("Dropping pending reply %p, replier %p receiver %p serial %u\n",
1604 pending,
1605 pending->will_send_reply,
1606 pending->will_get_reply,
1607 pending->reply_serial);
1608
1609 bus_expire_list_remove_link (connections->pending_replies,
1610 link);
1611 bus_pending_reply_free (pending);
1612 }
1613 else if (pending->will_send_reply == connection)
1614 {
1615 /* The reply isn't going to be sent, so set things
1616 * up so it will be expired right away
1617 */
1618 _dbus_verbose ("Will expire pending reply %p, replier %p receiver %p serial %u\n",
1619 pending,
1620 pending->will_send_reply,
1621 pending->will_get_reply,
1622 pending->reply_serial);
1623
1624 pending->will_send_reply = NULL;
1625 pending->expire_item.added_tv_sec = 0;
1626 pending->expire_item.added_tv_usec = 0;
1627
1628 bus_expire_list_recheck_immediately (connections->pending_replies);
1629 }
1630
1631 link = next;
1632 }
1633 }
1634
1635
1636 typedef struct
1637 {
1638 BusPendingReply *pending;
1639 BusConnections *connections;
1640 } CancelPendingReplyData;
1641
1642 static void
cancel_pending_reply(void * data)1643 cancel_pending_reply (void *data)
1644 {
1645 CancelPendingReplyData *d = data;
1646
1647 _dbus_verbose ("d = %p\n", d);
1648
1649 if (!bus_expire_list_remove (d->connections->pending_replies,
1650 &d->pending->expire_item))
1651 _dbus_assert_not_reached ("pending reply did not exist to be cancelled");
1652
1653 bus_pending_reply_free (d->pending); /* since it's been cancelled */
1654 }
1655
1656 static void
cancel_pending_reply_data_free(void * data)1657 cancel_pending_reply_data_free (void *data)
1658 {
1659 CancelPendingReplyData *d = data;
1660
1661 _dbus_verbose ("d = %p\n", d);
1662
1663 /* d->pending should be either freed or still
1664 * in the list of pending replies (owned by someone
1665 * else)
1666 */
1667
1668 dbus_free (d);
1669 }
1670
1671 /*
1672 * Record that a reply is allowed; return TRUE on success.
1673 */
1674 dbus_bool_t
bus_connections_expect_reply(BusConnections * connections,BusTransaction * transaction,DBusConnection * will_get_reply,DBusConnection * will_send_reply,DBusMessage * reply_to_this,DBusError * error)1675 bus_connections_expect_reply (BusConnections *connections,
1676 BusTransaction *transaction,
1677 DBusConnection *will_get_reply,
1678 DBusConnection *will_send_reply,
1679 DBusMessage *reply_to_this,
1680 DBusError *error)
1681 {
1682 BusPendingReply *pending;
1683 dbus_uint32_t reply_serial;
1684 DBusList *link;
1685 CancelPendingReplyData *cprd;
1686 int count;
1687
1688 _dbus_assert (will_get_reply != NULL);
1689 _dbus_assert (will_send_reply != NULL);
1690 _dbus_assert (reply_to_this != NULL);
1691
1692 if (dbus_message_get_no_reply (reply_to_this))
1693 return TRUE; /* we won't allow a reply, since client doesn't care for one. */
1694
1695 reply_serial = dbus_message_get_serial (reply_to_this);
1696
1697 link = bus_expire_list_get_first_link (connections->pending_replies);
1698 count = 0;
1699 while (link != NULL)
1700 {
1701 pending = link->data;
1702
1703 if (pending->reply_serial == reply_serial &&
1704 pending->will_get_reply == will_get_reply &&
1705 pending->will_send_reply == will_send_reply)
1706 {
1707 dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1708 "Message has the same reply serial as a currently-outstanding existing method call");
1709 return FALSE;
1710 }
1711
1712 link = bus_expire_list_get_next_link (connections->pending_replies,
1713 link);
1714 if (pending->will_get_reply == will_get_reply)
1715 ++count;
1716 }
1717
1718 if (count >=
1719 bus_context_get_max_replies_per_connection (connections->context))
1720 {
1721 dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1722 "The maximum number of pending replies per connection has been reached");
1723 return FALSE;
1724 }
1725
1726 pending = dbus_new0 (BusPendingReply, 1);
1727 if (pending == NULL)
1728 {
1729 BUS_SET_OOM (error);
1730 return FALSE;
1731 }
1732
1733 #ifdef DBUS_ENABLE_VERBOSE_MODE
1734 /* so we can see a not-yet-added pending reply */
1735 pending->expire_item.added_tv_sec = 1;
1736 pending->expire_item.added_tv_usec = 1;
1737 #endif
1738
1739 pending->will_get_reply = will_get_reply;
1740 pending->will_send_reply = will_send_reply;
1741 pending->reply_serial = reply_serial;
1742
1743 cprd = dbus_new0 (CancelPendingReplyData, 1);
1744 if (cprd == NULL)
1745 {
1746 BUS_SET_OOM (error);
1747 bus_pending_reply_free (pending);
1748 return FALSE;
1749 }
1750
1751 if (!bus_expire_list_add (connections->pending_replies,
1752 &pending->expire_item))
1753 {
1754 BUS_SET_OOM (error);
1755 dbus_free (cprd);
1756 bus_pending_reply_free (pending);
1757 return FALSE;
1758 }
1759
1760 if (!bus_transaction_add_cancel_hook (transaction,
1761 cancel_pending_reply,
1762 cprd,
1763 cancel_pending_reply_data_free))
1764 {
1765 BUS_SET_OOM (error);
1766 bus_expire_list_remove (connections->pending_replies, &pending->expire_item);
1767 dbus_free (cprd);
1768 bus_pending_reply_free (pending);
1769 return FALSE;
1770 }
1771
1772 cprd->pending = pending;
1773 cprd->connections = connections;
1774
1775 _dbus_get_monotonic_time (&pending->expire_item.added_tv_sec,
1776 &pending->expire_item.added_tv_usec);
1777
1778 _dbus_verbose ("Added pending reply %p, replier %p receiver %p serial %u\n",
1779 pending,
1780 pending->will_send_reply,
1781 pending->will_get_reply,
1782 pending->reply_serial);
1783
1784 return TRUE;
1785 }
1786
1787 typedef struct
1788 {
1789 DBusList *link;
1790 BusConnections *connections;
1791 } CheckPendingReplyData;
1792
1793 static void
cancel_check_pending_reply(void * data)1794 cancel_check_pending_reply (void *data)
1795 {
1796 CheckPendingReplyData *d = data;
1797
1798 _dbus_verbose ("d = %p\n",d);
1799
1800 bus_expire_list_add_link (d->connections->pending_replies,
1801 d->link);
1802 d->link = NULL;
1803 }
1804
1805 static void
check_pending_reply_data_free(void * data)1806 check_pending_reply_data_free (void *data)
1807 {
1808 CheckPendingReplyData *d = data;
1809
1810 _dbus_verbose ("d = %p\n",d);
1811
1812 if (d->link != NULL)
1813 {
1814 BusPendingReply *pending = d->link->data;
1815
1816 _dbus_assert (!bus_expire_list_contains_item (d->connections->pending_replies,
1817 &pending->expire_item));
1818
1819 bus_pending_reply_free (pending);
1820 _dbus_list_free_link (d->link);
1821 }
1822
1823 dbus_free (d);
1824 }
1825
1826 /*
1827 * Check whether a reply is allowed, remove BusPendingReply
1828 * if so, return TRUE if so.
1829 */
1830 dbus_bool_t
bus_connections_check_reply(BusConnections * connections,BusTransaction * transaction,DBusConnection * sending_reply,DBusConnection * receiving_reply,DBusMessage * reply,DBusError * error)1831 bus_connections_check_reply (BusConnections *connections,
1832 BusTransaction *transaction,
1833 DBusConnection *sending_reply,
1834 DBusConnection *receiving_reply,
1835 DBusMessage *reply,
1836 DBusError *error)
1837 {
1838 CheckPendingReplyData *cprd;
1839 DBusList *link;
1840 dbus_uint32_t reply_serial;
1841
1842 _dbus_assert (sending_reply != NULL);
1843 _dbus_assert (receiving_reply != NULL);
1844
1845 reply_serial = dbus_message_get_reply_serial (reply);
1846
1847 link = bus_expire_list_get_first_link (connections->pending_replies);
1848 while (link != NULL)
1849 {
1850 BusPendingReply *pending = link->data;
1851
1852 if (pending->reply_serial == reply_serial &&
1853 pending->will_get_reply == receiving_reply &&
1854 pending->will_send_reply == sending_reply)
1855 {
1856 _dbus_verbose ("Found pending reply with serial %u\n", reply_serial);
1857 break;
1858 }
1859
1860 link = bus_expire_list_get_next_link (connections->pending_replies,
1861 link);
1862 }
1863
1864 if (link == NULL)
1865 {
1866 _dbus_verbose ("No pending reply expected\n");
1867
1868 return FALSE;
1869 }
1870
1871 cprd = dbus_new0 (CheckPendingReplyData, 1);
1872 if (cprd == NULL)
1873 {
1874 BUS_SET_OOM (error);
1875 return FALSE;
1876 }
1877
1878 if (!bus_transaction_add_cancel_hook (transaction,
1879 cancel_check_pending_reply,
1880 cprd,
1881 check_pending_reply_data_free))
1882 {
1883 BUS_SET_OOM (error);
1884 dbus_free (cprd);
1885 return FALSE;
1886 }
1887
1888 cprd->link = link;
1889 cprd->connections = connections;
1890
1891 bus_expire_list_unlink (connections->pending_replies,
1892 link);
1893
1894 _dbus_assert (!bus_expire_list_contains_item (connections->pending_replies, link->data));
1895
1896 return TRUE;
1897 }
1898
1899 /*
1900 * Transactions
1901 *
1902 * Note that this is fairly fragile; in particular, don't try to use
1903 * one transaction across any main loop iterations.
1904 */
1905
1906 typedef struct
1907 {
1908 BusTransaction *transaction;
1909 DBusMessage *message;
1910 DBusPreallocatedSend *preallocated;
1911 } MessageToSend;
1912
1913 typedef struct
1914 {
1915 BusTransactionCancelFunction cancel_function;
1916 DBusFreeFunction free_data_function;
1917 void *data;
1918 } CancelHook;
1919
1920 struct BusTransaction
1921 {
1922 DBusList *connections;
1923 BusContext *context;
1924 DBusList *cancel_hooks;
1925 };
1926
1927 static void
message_to_send_free(DBusConnection * connection,MessageToSend * to_send)1928 message_to_send_free (DBusConnection *connection,
1929 MessageToSend *to_send)
1930 {
1931 if (to_send->message)
1932 dbus_message_unref (to_send->message);
1933
1934 if (to_send->preallocated)
1935 dbus_connection_free_preallocated_send (connection, to_send->preallocated);
1936
1937 dbus_free (to_send);
1938 }
1939
1940 static void
cancel_hook_cancel(void * element,void * data)1941 cancel_hook_cancel (void *element,
1942 void *data)
1943 {
1944 CancelHook *ch = element;
1945
1946 _dbus_verbose ("Running transaction cancel hook\n");
1947
1948 if (ch->cancel_function)
1949 (* ch->cancel_function) (ch->data);
1950 }
1951
1952 static void
cancel_hook_free(void * element,void * data)1953 cancel_hook_free (void *element,
1954 void *data)
1955 {
1956 CancelHook *ch = element;
1957
1958 if (ch->free_data_function)
1959 (* ch->free_data_function) (ch->data);
1960
1961 dbus_free (ch);
1962 }
1963
1964 static void
free_cancel_hooks(BusTransaction * transaction)1965 free_cancel_hooks (BusTransaction *transaction)
1966 {
1967 _dbus_list_foreach (&transaction->cancel_hooks,
1968 cancel_hook_free, NULL);
1969
1970 _dbus_list_clear (&transaction->cancel_hooks);
1971 }
1972
1973 BusTransaction*
bus_transaction_new(BusContext * context)1974 bus_transaction_new (BusContext *context)
1975 {
1976 BusTransaction *transaction;
1977
1978 transaction = dbus_new0 (BusTransaction, 1);
1979 if (transaction == NULL)
1980 return NULL;
1981
1982 transaction->context = context;
1983
1984 return transaction;
1985 }
1986
1987 BusContext*
bus_transaction_get_context(BusTransaction * transaction)1988 bus_transaction_get_context (BusTransaction *transaction)
1989 {
1990 return transaction->context;
1991 }
1992
1993 BusConnections*
bus_transaction_get_connections(BusTransaction * transaction)1994 bus_transaction_get_connections (BusTransaction *transaction)
1995 {
1996 return bus_context_get_connections (transaction->context);
1997 }
1998
1999 dbus_bool_t
bus_transaction_send_from_driver(BusTransaction * transaction,DBusConnection * connection,DBusMessage * message)2000 bus_transaction_send_from_driver (BusTransaction *transaction,
2001 DBusConnection *connection,
2002 DBusMessage *message)
2003 {
2004 /* We have to set the sender to the driver, and have
2005 * to check security policy since it was not done in
2006 * dispatch.c
2007 */
2008 _dbus_verbose ("Sending %s %s %s from driver\n",
2009 dbus_message_get_interface (message) ?
2010 dbus_message_get_interface (message) : "(no interface)",
2011 dbus_message_get_member (message) ?
2012 dbus_message_get_member (message) : "(no member)",
2013 dbus_message_get_error_name (message) ?
2014 dbus_message_get_error_name (message) : "(no error name)");
2015
2016 if (!dbus_message_set_sender (message, DBUS_SERVICE_DBUS))
2017 return FALSE;
2018
2019 if (bus_connection_is_active (connection))
2020 {
2021 if (!dbus_message_set_destination (message,
2022 bus_connection_get_name (connection)))
2023 return FALSE;
2024 }
2025
2026 /* bus driver never wants a reply */
2027 dbus_message_set_no_reply (message, TRUE);
2028
2029 /* If security policy doesn't allow the message, we silently
2030 * eat it; the driver doesn't care about getting a reply.
2031 */
2032 if (!bus_context_check_security_policy (bus_transaction_get_context (transaction),
2033 transaction,
2034 NULL, connection, connection, message, NULL))
2035 return TRUE;
2036
2037 return bus_transaction_send (transaction, connection, message);
2038 }
2039
2040 dbus_bool_t
bus_transaction_send(BusTransaction * transaction,DBusConnection * connection,DBusMessage * message)2041 bus_transaction_send (BusTransaction *transaction,
2042 DBusConnection *connection,
2043 DBusMessage *message)
2044 {
2045 MessageToSend *to_send;
2046 BusConnectionData *d;
2047 DBusList *link;
2048
2049 _dbus_verbose (" trying to add %s interface=%s member=%s error=%s to transaction%s\n",
2050 dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_ERROR ? "error" :
2051 dbus_message_get_reply_serial (message) != 0 ? "reply" :
2052 "message",
2053 dbus_message_get_interface (message) ?
2054 dbus_message_get_interface (message) : "(unset)",
2055 dbus_message_get_member (message) ?
2056 dbus_message_get_member (message) : "(unset)",
2057 dbus_message_get_error_name (message) ?
2058 dbus_message_get_error_name (message) : "(unset)",
2059 dbus_connection_get_is_connected (connection) ?
2060 "" : " (disconnected)");
2061
2062 _dbus_assert (dbus_message_get_sender (message) != NULL);
2063
2064 if (!dbus_connection_get_is_connected (connection))
2065 return TRUE; /* silently ignore disconnected connections */
2066
2067 d = BUS_CONNECTION_DATA (connection);
2068 _dbus_assert (d != NULL);
2069
2070 to_send = dbus_new (MessageToSend, 1);
2071 if (to_send == NULL)
2072 {
2073 return FALSE;
2074 }
2075
2076 to_send->preallocated = dbus_connection_preallocate_send (connection);
2077 if (to_send->preallocated == NULL)
2078 {
2079 dbus_free (to_send);
2080 return FALSE;
2081 }
2082
2083 dbus_message_ref (message);
2084 to_send->message = message;
2085 to_send->transaction = transaction;
2086
2087 _dbus_verbose ("about to prepend message\n");
2088
2089 if (!_dbus_list_prepend (&d->transaction_messages, to_send))
2090 {
2091 message_to_send_free (connection, to_send);
2092 return FALSE;
2093 }
2094
2095 _dbus_verbose ("prepended message\n");
2096
2097 /* See if we already had this connection in the list
2098 * for this transaction. If we have a pending message,
2099 * then we should already be in transaction->connections
2100 */
2101 link = _dbus_list_get_first_link (&d->transaction_messages);
2102 _dbus_assert (link->data == to_send);
2103 link = _dbus_list_get_next_link (&d->transaction_messages, link);
2104 while (link != NULL)
2105 {
2106 MessageToSend *m = link->data;
2107 DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2108
2109 if (m->transaction == transaction)
2110 break;
2111
2112 link = next;
2113 }
2114
2115 if (link == NULL)
2116 {
2117 if (!_dbus_list_prepend (&transaction->connections, connection))
2118 {
2119 _dbus_list_remove (&d->transaction_messages, to_send);
2120 message_to_send_free (connection, to_send);
2121 return FALSE;
2122 }
2123 }
2124
2125 return TRUE;
2126 }
2127
2128 static void
connection_cancel_transaction(DBusConnection * connection,BusTransaction * transaction)2129 connection_cancel_transaction (DBusConnection *connection,
2130 BusTransaction *transaction)
2131 {
2132 DBusList *link;
2133 BusConnectionData *d;
2134
2135 d = BUS_CONNECTION_DATA (connection);
2136 _dbus_assert (d != NULL);
2137
2138 link = _dbus_list_get_first_link (&d->transaction_messages);
2139 while (link != NULL)
2140 {
2141 MessageToSend *m = link->data;
2142 DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2143
2144 if (m->transaction == transaction)
2145 {
2146 _dbus_list_remove_link (&d->transaction_messages,
2147 link);
2148
2149 message_to_send_free (connection, m);
2150 }
2151
2152 link = next;
2153 }
2154 }
2155
2156 void
bus_transaction_cancel_and_free(BusTransaction * transaction)2157 bus_transaction_cancel_and_free (BusTransaction *transaction)
2158 {
2159 DBusConnection *connection;
2160
2161 _dbus_verbose ("TRANSACTION: cancelled\n");
2162
2163 while ((connection = _dbus_list_pop_first (&transaction->connections)))
2164 connection_cancel_transaction (connection, transaction);
2165
2166 _dbus_assert (transaction->connections == NULL);
2167
2168 _dbus_list_foreach (&transaction->cancel_hooks,
2169 cancel_hook_cancel, NULL);
2170
2171 free_cancel_hooks (transaction);
2172
2173 dbus_free (transaction);
2174 }
2175
2176 static void
connection_execute_transaction(DBusConnection * connection,BusTransaction * transaction)2177 connection_execute_transaction (DBusConnection *connection,
2178 BusTransaction *transaction)
2179 {
2180 DBusList *link;
2181 BusConnectionData *d;
2182
2183 d = BUS_CONNECTION_DATA (connection);
2184 _dbus_assert (d != NULL);
2185
2186 /* Send the queue in order (FIFO) */
2187 link = _dbus_list_get_last_link (&d->transaction_messages);
2188 while (link != NULL)
2189 {
2190 MessageToSend *m = link->data;
2191 DBusList *prev = _dbus_list_get_prev_link (&d->transaction_messages, link);
2192
2193 if (m->transaction == transaction)
2194 {
2195 _dbus_list_remove_link (&d->transaction_messages,
2196 link);
2197
2198 _dbus_assert (dbus_message_get_sender (m->message) != NULL);
2199
2200 dbus_connection_send_preallocated (connection,
2201 m->preallocated,
2202 m->message,
2203 NULL);
2204
2205 m->preallocated = NULL; /* so we don't double-free it */
2206
2207 message_to_send_free (connection, m);
2208 }
2209
2210 link = prev;
2211 }
2212 }
2213
2214 void
bus_transaction_execute_and_free(BusTransaction * transaction)2215 bus_transaction_execute_and_free (BusTransaction *transaction)
2216 {
2217 /* For each connection in transaction->connections
2218 * send the messages
2219 */
2220 DBusConnection *connection;
2221
2222 _dbus_verbose ("TRANSACTION: executing\n");
2223
2224 while ((connection = _dbus_list_pop_first (&transaction->connections)))
2225 connection_execute_transaction (connection, transaction);
2226
2227 _dbus_assert (transaction->connections == NULL);
2228
2229 free_cancel_hooks (transaction);
2230
2231 dbus_free (transaction);
2232 }
2233
2234 static void
bus_connection_remove_transactions(DBusConnection * connection)2235 bus_connection_remove_transactions (DBusConnection *connection)
2236 {
2237 MessageToSend *to_send;
2238 BusConnectionData *d;
2239
2240 d = BUS_CONNECTION_DATA (connection);
2241 _dbus_assert (d != NULL);
2242
2243 while ((to_send = _dbus_list_get_first (&d->transaction_messages)))
2244 {
2245 /* only has an effect for the first MessageToSend listing this transaction */
2246 _dbus_list_remove (&to_send->transaction->connections,
2247 connection);
2248
2249 _dbus_list_remove (&d->transaction_messages, to_send);
2250 message_to_send_free (connection, to_send);
2251 }
2252 }
2253
2254 /**
2255 * Converts the DBusError to a message reply
2256 */
2257 dbus_bool_t
bus_transaction_send_error_reply(BusTransaction * transaction,DBusConnection * connection,const DBusError * error,DBusMessage * in_reply_to)2258 bus_transaction_send_error_reply (BusTransaction *transaction,
2259 DBusConnection *connection,
2260 const DBusError *error,
2261 DBusMessage *in_reply_to)
2262 {
2263 DBusMessage *reply;
2264
2265 _dbus_assert (error != NULL);
2266 _DBUS_ASSERT_ERROR_IS_SET (error);
2267
2268 _dbus_verbose ("Sending error reply %s \"%s\"\n",
2269 error->name, error->message);
2270
2271 reply = dbus_message_new_error (in_reply_to,
2272 error->name,
2273 error->message);
2274 if (reply == NULL)
2275 return FALSE;
2276
2277 if (!bus_transaction_send_from_driver (transaction, connection, reply))
2278 {
2279 dbus_message_unref (reply);
2280 return FALSE;
2281 }
2282
2283 dbus_message_unref (reply);
2284
2285 return TRUE;
2286 }
2287
2288 dbus_bool_t
bus_transaction_add_cancel_hook(BusTransaction * transaction,BusTransactionCancelFunction cancel_function,void * data,DBusFreeFunction free_data_function)2289 bus_transaction_add_cancel_hook (BusTransaction *transaction,
2290 BusTransactionCancelFunction cancel_function,
2291 void *data,
2292 DBusFreeFunction free_data_function)
2293 {
2294 CancelHook *ch;
2295
2296 ch = dbus_new (CancelHook, 1);
2297 if (ch == NULL)
2298 return FALSE;
2299
2300 _dbus_verbose (" adding cancel hook function = %p data = %p\n",
2301 cancel_function, data);
2302
2303 ch->cancel_function = cancel_function;
2304 ch->data = data;
2305 ch->free_data_function = free_data_function;
2306
2307 /* It's important that the hooks get run in reverse order that they
2308 * were added
2309 */
2310 if (!_dbus_list_prepend (&transaction->cancel_hooks, ch))
2311 {
2312 dbus_free (ch);
2313 return FALSE;
2314 }
2315
2316 return TRUE;
2317 }
2318
2319 #ifdef DBUS_ENABLE_STATS
2320 int
bus_connections_get_n_active(BusConnections * connections)2321 bus_connections_get_n_active (BusConnections *connections)
2322 {
2323 return connections->n_completed;
2324 }
2325
2326 int
bus_connections_get_n_incomplete(BusConnections * connections)2327 bus_connections_get_n_incomplete (BusConnections *connections)
2328 {
2329 return connections->n_incomplete;
2330 }
2331
2332 int
bus_connections_get_total_match_rules(BusConnections * connections)2333 bus_connections_get_total_match_rules (BusConnections *connections)
2334 {
2335 return connections->total_match_rules;
2336 }
2337
2338 int
bus_connections_get_peak_match_rules(BusConnections * connections)2339 bus_connections_get_peak_match_rules (BusConnections *connections)
2340 {
2341 return connections->peak_match_rules;
2342 }
2343
2344 int
bus_connections_get_peak_match_rules_per_conn(BusConnections * connections)2345 bus_connections_get_peak_match_rules_per_conn (BusConnections *connections)
2346 {
2347 return connections->peak_match_rules_per_conn;
2348 }
2349
2350 int
bus_connections_get_total_bus_names(BusConnections * connections)2351 bus_connections_get_total_bus_names (BusConnections *connections)
2352 {
2353 return connections->total_bus_names;
2354 }
2355
2356 int
bus_connections_get_peak_bus_names(BusConnections * connections)2357 bus_connections_get_peak_bus_names (BusConnections *connections)
2358 {
2359 return connections->peak_bus_names;
2360 }
2361
2362 int
bus_connections_get_peak_bus_names_per_conn(BusConnections * connections)2363 bus_connections_get_peak_bus_names_per_conn (BusConnections *connections)
2364 {
2365 return connections->peak_bus_names_per_conn;
2366 }
2367
2368 int
bus_connection_get_peak_match_rules(DBusConnection * connection)2369 bus_connection_get_peak_match_rules (DBusConnection *connection)
2370 {
2371 BusConnectionData *d;
2372
2373 d = BUS_CONNECTION_DATA (connection);
2374 return d->peak_match_rules;
2375 }
2376
2377 int
bus_connection_get_peak_bus_names(DBusConnection * connection)2378 bus_connection_get_peak_bus_names (DBusConnection *connection)
2379 {
2380 BusConnectionData *d;
2381
2382 d = BUS_CONNECTION_DATA (connection);
2383 return d->peak_bus_names;
2384 }
2385 #endif /* DBUS_ENABLE_STATS */
2386