bus/connection.c

   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*
 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
 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
 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
 188 bus_connection_disconnected (DBusConnection *connection)
 189 {
 190   BusConnectionData *d;
 191   BusService *service;
 192   BusMatchmaker *matchmaker;
 193   dbus_bool_t is_phantom = FALSE;
 194
 195   d = BUS_CONNECTION_DATA (connection);
 196   _dbus_assert (d != NULL);
 197
 198   _dbus_verbose ("%s disconnected, dropping all service ownership and releasing\n",
 199                  d->name ? d->name : "(inactive)");
 200
 201   if(bus_context_is_kdbus(d->connections->context) && (strcmp(bus_connection_get_name(connection), ":1.1")))
 202       is_phantom = TRUE;
 203
 204   /* Delete our match rules */
 205   if (d->n_match_rules > 0)
 206     {
 207       matchmaker = bus_context_get_matchmaker (d->connections->context);
 208       bus_matchmaker_disconnected (matchmaker, connection);
 209     }
 210
 211   /* Drop any service ownership. Unfortunately, this requires
 212    * memory allocation and there doesn't seem to be a good way to
 213    * handle it other than sleeping; we can't "fail" the operation of
 214    * disconnecting a client, and preallocating a broadcast "service is
 215    * now gone" message for every client-service pair seems kind of
 216    * involved.
 217    */
 218   while ((service = _dbus_list_get_last (&d->services_owned)))
 219     {
 220       BusTransaction *transaction;
 221       DBusError error;
 222
 223     retry:
 224
 225       dbus_error_init (&error);
 226
 227       while ((transaction = bus_transaction_new (d->connections->context)) == NULL)
 228         _dbus_wait_for_memory ();
 229
 230       if (!bus_service_remove_owner (service, connection,
 231                                      transaction, &error))
 232         {
 233           _DBUS_ASSERT_ERROR_IS_SET (&error);
 234
 235           if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY))
 236             {
 237               dbus_error_free (&error);
 238               bus_transaction_cancel_and_free (transaction);
 239               _dbus_wait_for_memory ();
 240               goto retry;
 241             }
 242           else
 243             {
 244               _dbus_verbose ("Failed to remove service owner: %s %s\n",
 245                              error.name, error.message);
 246               _dbus_assert_not_reached ("Removing service owner failed for non-memory-related reason");
 247             }
 248         }
 249
 250       bus_transaction_execute_and_free (transaction);
 251     }
 252
 253   bus_dispatch_remove_connection (connection);
 254
 255   /* no more watching */
 256   if (!dbus_connection_set_watch_functions (connection,
 257                                             NULL, NULL, NULL,
 258                                             connection,
 259                                             NULL))
 260     _dbus_assert_not_reached ("setting watch functions to NULL failed");
 261
 262   if (!dbus_connection_set_timeout_functions (connection,
 263                                               NULL, NULL, NULL,
 264                                               connection,
 265                                               NULL))
 266     _dbus_assert_not_reached ("setting timeout functions to NULL failed");
 267
 268   dbus_connection_set_unix_user_function (connection,
 269                                           NULL, NULL, NULL);
 270   dbus_connection_set_windows_user_function (connection,
 271                                              NULL, NULL, NULL);
 272
 273   dbus_connection_set_dispatch_status_function (connection,
 274                                                 NULL, NULL, NULL);
 275
 276   bus_connection_remove_transactions (connection);
 277
 278   if (d->link_in_connection_list != NULL)
 279     {
 280       if (d->name != NULL)
 281         {
 282           unsigned long uid;
 283
 284           _dbus_list_remove_link (&d->connections->completed, d->link_in_connection_list);
 285           d->link_in_connection_list = NULL;
 286           d->connections->n_completed -= 1;
 287
 288           if (dbus_connection_get_unix_user (connection, &uid))
 289             {
 290               if (!adjust_connections_for_uid (d->connections,
 291                                                uid, -1))
 292                 _dbus_assert_not_reached ("adjusting downward should never fail");
 293             }
 294         }
 295       else
 296         {
 297           _dbus_list_remove_link (&d->connections->incomplete, d->link_in_connection_list);
 298           d->link_in_connection_list = NULL;
 299           d->connections->n_incomplete -= 1;
 300         }
 301
 302       _dbus_assert (d->connections->n_incomplete >= 0);
 303       _dbus_assert (d->connections->n_completed >= 0);
 304     }
 305
 306   bus_connection_drop_pending_replies (d->connections, connection);
 307
 308   /* frees "d" as side effect */
 309   dbus_connection_set_data (connection,
 310                             connection_data_slot,
 311                             NULL, NULL);
 312   if(is_phantom)
 313       dbus_connection_unref_phantom(connection);
 314   else
 315       dbus_connection_unref (connection);
 316 }
 317
 318 static dbus_bool_t
 319 add_connection_watch (DBusWatch      *watch,
 320                       void           *data)
 321 {
 322   DBusConnection *connection = data;
 323
 324   return _dbus_loop_add_watch (connection_get_loop (connection), watch);
 325 }
 326
 327 static void
 328 remove_connection_watch (DBusWatch      *watch,
 329                          void           *data)
 330 {
 331   DBusConnection *connection = data;
 332
 333   _dbus_loop_remove_watch (connection_get_loop (connection), watch);
 334 }
 335
 336 static void
 337 toggle_connection_watch (DBusWatch      *watch,
 338                          void           *data)
 339 {
 340   DBusConnection *connection = data;
 341
 342   _dbus_loop_toggle_watch (connection_get_loop (connection), watch);
 343 }
 344
 345 static dbus_bool_t
 346 add_connection_timeout (DBusTimeout    *timeout,
 347                         void           *data)
 348 {
 349   DBusConnection *connection = data;
 350
 351   return _dbus_loop_add_timeout (connection_get_loop (connection), timeout);
 352 }
 353
 354 static void
 355 remove_connection_timeout (DBusTimeout    *timeout,
 356                            void           *data)
 357 {
 358   DBusConnection *connection = data;
 359
 360   _dbus_loop_remove_timeout (connection_get_loop (connection), timeout);
 361 }
 362
 363 static void
 364 dispatch_status_function (DBusConnection    *connection,
 365                           DBusDispatchStatus new_status,
 366                           void              *data)
 367 {
 368   DBusLoop *loop = data;
 369
 370   if (new_status != DBUS_DISPATCH_COMPLETE)
 371     {
 372       while (!_dbus_loop_queue_dispatch (loop, connection))
 373         _dbus_wait_for_memory ();
 374     }
 375 }
 376
 377 static dbus_bool_t
 378 allow_unix_user_function (DBusConnection *connection,
 379                           unsigned long   uid,
 380                           void           *data)
 381 {
 382   BusConnectionData *d;
 383
 384   d = BUS_CONNECTION_DATA (connection);
 385
 386   _dbus_assert (d != NULL);
 387
 388   return bus_context_allow_unix_user (d->connections->context, uid);
 389 }
 390
 391 static void
 392 free_connection_data (void *data)
 393 {
 394   BusConnectionData *d = data;
 395
 396   /* services_owned should be NULL since we should be disconnected */
 397   _dbus_assert (d->services_owned == NULL);
 398   _dbus_assert (d->n_services_owned == 0);
 399   /* similarly */
 400   _dbus_assert (d->transaction_messages == NULL);
 401
 402   if (d->oom_preallocated)
 403     dbus_connection_free_preallocated_send (d->connection, d->oom_preallocated);
 404
 405   if (d->oom_message)
 406     dbus_message_unref (d->oom_message);
 407
 408   if (d->policy)
 409     bus_client_policy_unref (d->policy);
 410
 411   if (d->selinux_id)
 412     bus_selinux_id_unref (d->selinux_id);
 413
 414   dbus_free (d->cached_loginfo_string);
 415
 416   dbus_free (d->name);
 417
 418   dbus_free (d);
 419 }
 420
 421 BusConnections*
 422 bus_connections_new (BusContext *context)
 423 {
 424   BusConnections *connections;
 425
 426   if (!dbus_connection_allocate_data_slot (&connection_data_slot))
 427     goto failed_0;
 428
 429   connections = dbus_new0 (BusConnections, 1);
 430   if (connections == NULL)
 431     goto failed_1;
 432
 433   connections->completed_by_user = _dbus_hash_table_new (DBUS_HASH_UINTPTR,
 434                                                          NULL, NULL);
 435   if (connections->completed_by_user == NULL)
 436     goto failed_2;
 437
 438   connections->expire_timeout = _dbus_timeout_new (100, /* irrelevant */
 439                                                    expire_incomplete_timeout,
 440                                                    connections, NULL);
 441   if (connections->expire_timeout == NULL)
 442     goto failed_3;
 443
 444   _dbus_timeout_set_enabled (connections->expire_timeout, FALSE);
 445
 446   connections->pending_replies = bus_expire_list_new (bus_context_get_loop (context),
 447                                                       bus_context_get_reply_timeout (context),
 448                                                       bus_pending_reply_expired,
 449                                                       connections);
 450   if (connections->pending_replies == NULL)
 451     goto failed_4;
 452
 453   if (!_dbus_loop_add_timeout (bus_context_get_loop (context),
 454                                connections->expire_timeout))
 455     goto failed_5;
 456
 457   connections->refcount = 1;
 458   connections->context = context;
 459
 460   return connections;
 461
 462  failed_5:
 463   bus_expire_list_free (connections->pending_replies);
 464  failed_4:
 465   _dbus_timeout_unref (connections->expire_timeout);
 466  failed_3:
 467   _dbus_hash_table_unref (connections->completed_by_user);
 468  failed_2:
 469   dbus_free (connections);
 470  failed_1:
 471   dbus_connection_free_data_slot (&connection_data_slot);
 472  failed_0:
 473   return NULL;
 474 }
 475
 476 BusConnections *
 477 bus_connections_ref (BusConnections *connections)
 478 {
 479   _dbus_assert (connections->refcount > 0);
 480   connections->refcount += 1;
 481
 482   return connections;
 483 }
 484
 485 void
 486 bus_connections_unref (BusConnections *connections)
 487 {
 488   _dbus_assert (connections->refcount > 0);
 489   connections->refcount -= 1;
 490   if (connections->refcount == 0)
 491     {
 492       /* drop all incomplete */
 493       while (connections->incomplete != NULL)
 494         {
 495           DBusConnection *connection;
 496
 497           connection = connections->incomplete->data;
 498
 499           dbus_connection_ref (connection);
 500           dbus_connection_close (connection);
 501           bus_connection_disconnected (connection);
 502           dbus_connection_unref (connection);
 503         }
 504
 505       _dbus_assert (connections->n_incomplete == 0);
 506
 507       /* drop all real connections */
 508       while (connections->completed != NULL)
 509         {
 510           DBusConnection *connection;
 511
 512           connection = connections->completed->data;
 513
 514           dbus_connection_ref (connection);
 515           dbus_connection_close (connection);
 516           bus_connection_disconnected (connection);
 517           dbus_connection_unref (connection);
 518         }
 519
 520       _dbus_assert (connections->n_completed == 0);
 521
 522       bus_expire_list_free (connections->pending_replies);
 523
 524       _dbus_loop_remove_timeout (bus_context_get_loop (connections->context),
 525                                  connections->expire_timeout);
 526
 527       _dbus_timeout_unref (connections->expire_timeout);
 528
 529       _dbus_hash_table_unref (connections->completed_by_user);
 530
 531       dbus_free (connections);
 532
 533       dbus_connection_free_data_slot (&connection_data_slot);
 534     }
 535 }
 536
 537 /* Used for logging */
 538 static dbus_bool_t
 539 cache_peer_loginfo_string (BusConnectionData *d,
 540                            DBusConnection    *connection)
 541 {
 542   DBusString loginfo_buf;
 543   unsigned long uid;
 544   unsigned long pid;
 545   char *windows_sid;
 546   dbus_bool_t prev_added;
 547
 548   if (!_dbus_string_init (&loginfo_buf))
 549     return FALSE;
 550
 551   prev_added = FALSE;
 552   if (dbus_connection_get_unix_user (connection, &uid))
 553     {
 554       if (!_dbus_string_append_printf (&loginfo_buf, "uid=%ld", uid))
 555         goto oom;
 556       else
 557         prev_added = TRUE;
 558     }
 559
 560   if (dbus_connection_get_unix_process_id (connection, &pid))
 561     {
 562       if (prev_added)
 563         {
 564           if (!_dbus_string_append_byte (&loginfo_buf, ' '))
 565             goto oom;
 566         }
 567       if (!_dbus_string_append_printf (&loginfo_buf, "pid=%ld comm=\"", pid))
 568         goto oom;
 569       /* Ignore errors here; we may not have permissions to read the
 570        * proc file. */
 571       _dbus_command_for_pid (pid, &loginfo_buf, MAX_LOG_COMMAND_LEN, NULL);
 572       if (!_dbus_string_append_byte (&loginfo_buf, '"'))
 573         goto oom;
 574     }
 575
 576   if (dbus_connection_get_windows_user (connection, &windows_sid))
 577     {
 578       dbus_bool_t did_append;
 579       did_append = _dbus_string_append_printf (&loginfo_buf,
 580                                                "sid=\"%s\" ", windows_sid);
 581       dbus_free (windows_sid);
 582       if (!did_append)
 583         goto oom;
 584     }
 585
 586   if (!_dbus_string_steal_data (&loginfo_buf, &(d->cached_loginfo_string)))
 587     goto oom;
 588
 589   _dbus_string_free (&loginfo_buf);
 590
 591   return TRUE;
 592 oom:
 593    _dbus_string_free (&loginfo_buf);
 594    return FALSE;
 595 }
 596
 597 dbus_bool_t
 598 bus_connections_setup_connection (BusConnections *connections,
 599                                   DBusConnection *connection)
 600 {
 601
 602   BusConnectionData *d;
 603   dbus_bool_t retval;
 604   DBusError error;
 605
 606
 607   d = dbus_new0 (BusConnectionData, 1);
 608
 609   if (d == NULL)
 610     return FALSE;
 611
 612   d->connections = connections;
 613   d->connection = connection;
 614
 615   _dbus_get_monotonic_time (&d->connection_tv_sec,
 616                             &d->connection_tv_usec);
 617
 618   _dbus_assert (connection_data_slot >= 0);
 619
 620   if (!dbus_connection_set_data (connection,
 621                                  connection_data_slot,
 622                                  d, free_connection_data))
 623     {
 624       dbus_free (d);
 625       return FALSE;
 626     }
 627
 628   dbus_connection_set_route_peer_messages (connection, TRUE);
 629
 630   retval = FALSE;
 631
 632   dbus_error_init (&error);
 633   d->selinux_id = bus_selinux_init_connection_id (connection,
 634                                                   &error);
 635   if (dbus_error_is_set (&error))
 636     {
 637       /* This is a bit bogus because we pretend all errors
 638        * are OOM; this is done because we know that in bus.c
 639        * an OOM error disconnects the connection, which is
 640        * the same thing we want on any other error.
 641        */
 642       dbus_error_free (&error);
 643       goto out;
 644     }
 645
 646   if (!dbus_connection_set_watch_functions (connection,
 647                                             add_connection_watch,
 648                                             remove_connection_watch,
 649                                             toggle_connection_watch,
 650                                             connection,
 651                                             NULL))
 652     goto out;
 653
 654   if (!dbus_connection_set_timeout_functions (connection,
 655                                               add_connection_timeout,
 656                                               remove_connection_timeout,
 657                                               NULL,
 658                                               connection, NULL))
 659     goto out;
 660
 661   /* For now we don't need to set a Windows user function because
 662    * there are no policies in the config file controlling what
 663    * Windows users can connect. The default 'same user that owns the
 664    * bus can connect' behavior of DBusConnection is fine on Windows.
 665    */
 666   dbus_connection_set_unix_user_function (connection,
 667                                           allow_unix_user_function,
 668                                           NULL, NULL);
 669
 670   dbus_connection_set_dispatch_status_function (connection,
 671                                                 dispatch_status_function,
 672                                                 bus_context_get_loop (connections->context),
 673                                                 NULL);
 674
 675   d->link_in_connection_list = _dbus_list_alloc_link (connection);
 676   if (d->link_in_connection_list == NULL)
 677     goto out;
 678
 679   /* Setup the connection with the dispatcher */
 680   if (!bus_dispatch_add_connection (connection))
 681     goto out;
 682
 683   if (dbus_connection_get_dispatch_status (connection) != DBUS_DISPATCH_COMPLETE)
 684     {
 685       if (!_dbus_loop_queue_dispatch (bus_context_get_loop (connections->context), connection))
 686         {
 687           bus_dispatch_remove_connection (connection);
 688           goto out;
 689         }
 690     }
 691
 692   _dbus_list_append_link (&connections->incomplete, d->link_in_connection_list);
 693   connections->n_incomplete += 1;
 694
 695   dbus_connection_ref (connection);
 696
 697   /* Note that we might disconnect ourselves here, but it only takes
 698    * effect on return to the main loop. We call this to free up
 699    * expired connections if possible, and to queue the timeout for our
 700    * own expiration.
 701    */
 702   bus_connections_expire_incomplete (connections);
 703
 704   /* And we might also disconnect ourselves here, but again it
 705    * only takes effect on return to main loop.
 706    */
 707   if (connections->n_incomplete >
 708       bus_context_get_max_incomplete_connections (connections->context))
 709     {
 710       _dbus_verbose ("Number of incomplete connections exceeds max, dropping oldest one\n");
 711
 712       _dbus_assert (connections->incomplete != NULL);
 713       /* Disconnect the oldest unauthenticated connection.  FIXME
 714        * would it be more secure to drop a *random* connection?  This
 715        * algorithm seems to mean that if someone can create new
 716        * connections quickly enough, they can keep anyone else from
 717        * completing authentication. But random may or may not really
 718        * help with that, a more elaborate solution might be required.
 719        */
 720       dbus_connection_close (connections->incomplete->data);
 721     }
 722
 723   retval = TRUE;
 724
 725  out:
 726   if (!retval)
 727     {
 728       if (d->selinux_id)
 729         bus_selinux_id_unref (d->selinux_id);
 730       d->selinux_id = NULL;
 731
 732       if (!dbus_connection_set_watch_functions (connection,
 733                                                 NULL, NULL, NULL,
 734                                                 connection,
 735                                                 NULL))
 736         _dbus_assert_not_reached ("setting watch functions to NULL failed");
 737
 738       if (!dbus_connection_set_timeout_functions (connection,
 739                                                   NULL, NULL, NULL,
 740                                                   connection,
 741                                                   NULL))
 742         _dbus_assert_not_reached ("setting timeout functions to NULL failed");
 743
 744       dbus_connection_set_unix_user_function (connection,
 745                                               NULL, NULL, NULL);
 746
 747       dbus_connection_set_windows_user_function (connection,
 748                                                  NULL, NULL, NULL);
 749
 750       dbus_connection_set_dispatch_status_function (connection,
 751                                                     NULL, NULL, NULL);
 752
 753       if (d->link_in_connection_list != NULL)
 754         {
 755           _dbus_assert (d->link_in_connection_list->next == NULL);
 756           _dbus_assert (d->link_in_connection_list->prev == NULL);
 757           _dbus_list_free_link (d->link_in_connection_list);
 758           d->link_in_connection_list = NULL;
 759         }
 760
 761       if (!dbus_connection_set_data (connection,
 762                                      connection_data_slot,
 763                                      NULL, NULL))
 764         _dbus_assert_not_reached ("failed to set connection data to null");
 765
 766       /* "d" has now been freed */
 767     }
 768
 769   return retval;
 770 }
 771
 772 void
 773 bus_connections_expire_incomplete (BusConnections *connections)
 774 {
 775   int next_interval;
 776
 777   next_interval = -1;
 778
 779   if (connections->incomplete != NULL)
 780     {
 781       long tv_sec, tv_usec;
 782       DBusList *link;
 783       int auth_timeout;
 784
 785       _dbus_get_monotonic_time (&tv_sec, &tv_usec);
 786       auth_timeout = bus_context_get_auth_timeout (connections->context);
 787
 788       link = _dbus_list_get_first_link (&connections->incomplete);
 789       while (link != NULL)
 790         {
 791           DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
 792           DBusConnection *connection;
 793           BusConnectionData *d;
 794           double elapsed;
 795
 796           connection = link->data;
 797
 798           d = BUS_CONNECTION_DATA (connection);
 799
 800           _dbus_assert (d != NULL);
 801
 802           elapsed = ELAPSED_MILLISECONDS_SINCE (d->connection_tv_sec,
 803                                                 d->connection_tv_usec,
 804                                                 tv_sec, tv_usec);
 805
 806           if (elapsed >= (double) auth_timeout)
 807             {
 808               _dbus_verbose ("Timing out authentication for connection %p\n", connection);
 809               dbus_connection_close (connection);
 810             }
 811           else
 812             {
 813               /* We can end the loop, since the connections are in oldest-first order */
 814               next_interval = ((double)auth_timeout) - elapsed;
 815               _dbus_verbose ("Connection %p authentication expires in %d milliseconds\n",
 816                              connection, next_interval);
 817
 818               break;
 819             }
 820
 821           link = next;
 822         }
 823     }
 824
 825   bus_expire_timeout_set_interval (connections->expire_timeout,
 826                                    next_interval);
 827 }
 828
 829 static dbus_bool_t
 830 expire_incomplete_timeout (void *data)
 831 {
 832   BusConnections *connections = data;
 833
 834   _dbus_verbose ("Running\n");
 835
 836   /* note that this may remove the timeout */
 837   bus_connections_expire_incomplete (connections);
 838
 839   return TRUE;
 840 }
 841
 842 dbus_bool_t
 843 bus_connection_get_unix_groups  (DBusConnection   *connection,
 844                                  unsigned long   **groups,
 845                                  int              *n_groups,
 846                                  DBusError        *error)
 847 {
 848   unsigned long uid;
 849
 850   *groups = NULL;
 851   *n_groups = 0;
 852
 853   if (dbus_connection_get_unix_user (connection, &uid))
 854     {
 855       if (!_dbus_unix_groups_from_uid (uid, groups, n_groups))
 856         {
 857           _dbus_verbose ("Did not get any groups for UID %lu\n",
 858                          uid);
 859           return FALSE;
 860         }
 861       else
 862         {
 863           _dbus_verbose ("Got %d groups for UID %lu\n",
 864                          *n_groups, uid);
 865           return TRUE;
 866         }
 867     }
 868   else
 869     return TRUE; /* successfully got 0 groups */
 870 }
 871
 872 dbus_bool_t
 873 bus_connection_is_in_unix_group (DBusConnection *connection,
 874                                  unsigned long   gid)
 875 {
 876   int i;
 877   unsigned long *group_ids;
 878   int n_group_ids;
 879
 880   if (!bus_connection_get_unix_groups (connection, &group_ids, &n_group_ids,
 881                                        NULL))
 882     return FALSE;
 883
 884   i = 0;
 885   while (i < n_group_ids)
 886     {
 887       if (group_ids[i] == gid)
 888         {
 889           dbus_free (group_ids);
 890           return TRUE;
 891         }
 892       ++i;
 893     }
 894
 895   dbus_free (group_ids);
 896   return FALSE;
 897 }
 898
 899 const char *
 900 bus_connection_get_loginfo (DBusConnection        *connection)
 901 {
 902   BusConnectionData *d;
 903
 904   d = BUS_CONNECTION_DATA (connection);
 905
 906   if (!bus_connection_is_active (connection))
 907     return "inactive";
 908   return d->cached_loginfo_string;
 909 }
 910
 911 BusClientPolicy*
 912 bus_connection_get_policy (DBusConnection *connection)
 913 {
 914   BusConnectionData *d;
 915
 916   d = BUS_CONNECTION_DATA (connection);
 917
 918   _dbus_assert (d != NULL);
 919   _dbus_assert (d->policy != NULL);
 920
 921   return d->policy;
 922 }
 923
 924 static dbus_bool_t
 925 foreach_active (BusConnections               *connections,
 926                 BusConnectionForeachFunction  function,
 927                 void                         *data)
 928 {
 929   DBusList *link;
 930
 931   link = _dbus_list_get_first_link (&connections->completed);
 932   while (link != NULL)
 933     {
 934       DBusConnection *connection = link->data;
 935       DBusList *next = _dbus_list_get_next_link (&connections->completed, link);
 936
 937       if (!(* function) (connection, data))
 938         return FALSE;
 939
 940       link = next;
 941     }
 942
 943   return TRUE;
 944 }
 945
 946 static dbus_bool_t
 947 foreach_inactive (BusConnections               *connections,
 948                   BusConnectionForeachFunction  function,
 949                   void                         *data)
 950 {
 951   DBusList *link;
 952
 953   link = _dbus_list_get_first_link (&connections->incomplete);
 954   while (link != NULL)
 955     {
 956       DBusConnection *connection = link->data;
 957       DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
 958
 959       if (!(* function) (connection, data))
 960         return FALSE;
 961
 962       link = next;
 963     }
 964
 965   return TRUE;
 966 }
 967
 968 /**
 969  * Calls function on each active connection; if the function returns
 970  * #FALSE, stops iterating. Active connections are authenticated
 971  * and have sent a Hello message.
 972  *
 973  * @param connections the connections object
 974  * @param function the function
 975  * @param data data to pass to it as a second arg
 976  */
 977 void
 978 bus_connections_foreach_active (BusConnections               *connections,
 979                                 BusConnectionForeachFunction  function,
 980                                 void                         *data)
 981 {
 982   foreach_active (connections, function, data);
 983 }
 984
 985 /**
 986  * Calls function on each connection; if the function returns
 987  * #FALSE, stops iterating.
 988  *
 989  * @param connections the connections object
 990  * @param function the function
 991  * @param data data to pass to it as a second arg
 992  */
 993 void
 994 bus_connections_foreach (BusConnections               *connections,
 995                          BusConnectionForeachFunction  function,
 996                          void                         *data)
 997 {
 998   if (!foreach_active (connections, function, data))
 999     return;
1000
1001   foreach_inactive (connections, function, data);
1002 }
1003
1004 DBusConnection*
1005 bus_connections_find_conn_by_name(BusConnections *connections, const char* name)
1006 {
1007     DBusList *link;
1008
1009     link = _dbus_list_get_first_link (&connections->completed);
1010     while (link != NULL)
1011       {
1012         DBusConnection *connection = link->data;
1013         DBusList *next = _dbus_list_get_next_link (&connections->completed, link);
1014
1015         if (!strcmp(bus_connection_get_name(connection), name))
1016           return connection;
1017
1018         link = next;
1019       }
1020
1021     return NULL;
1022 }
1023
1024 BusContext*
1025 bus_connections_get_context (BusConnections *connections)
1026 {
1027   return connections->context;
1028 }
1029
1030 /*
1031  * This is used to avoid covering the same connection twice when
1032  * traversing connections. Note that it assumes we will
1033  * bus_connection_mark_stamp() each connection at least once per
1034  * INT_MAX increments of the global stamp, or wraparound would break
1035  * things.
1036  */
1037 void
1038 bus_connections_increment_stamp (BusConnections *connections)
1039 {
1040   connections->stamp += 1;
1041 }
1042
1043 /* Mark connection with current stamp, return TRUE if it
1044  * didn't already have that stamp
1045  */
1046 dbus_bool_t
1047 bus_connection_mark_stamp (DBusConnection *connection)
1048 {
1049   BusConnectionData *d;
1050
1051   d = BUS_CONNECTION_DATA (connection);
1052
1053   _dbus_assert (d != NULL);
1054
1055   if (d->stamp == d->connections->stamp)
1056     return FALSE;
1057   else
1058     {
1059       d->stamp = d->connections->stamp;
1060       return TRUE;
1061     }
1062 }
1063
1064 BusContext*
1065 bus_connection_get_context (DBusConnection *connection)
1066 {
1067   BusConnectionData *d;
1068
1069   d = BUS_CONNECTION_DATA (connection);
1070
1071   _dbus_assert (d != NULL);
1072
1073   return d->connections->context;
1074 }
1075
1076 BusConnections*
1077 bus_connection_get_connections (DBusConnection *connection)
1078 {
1079   BusConnectionData *d;
1080
1081   d = BUS_CONNECTION_DATA (connection);
1082
1083   _dbus_assert (d != NULL);
1084
1085   return d->connections;
1086 }
1087
1088 BusRegistry*
1089 bus_connection_get_registry (DBusConnection *connection)
1090 {
1091   BusConnectionData *d;
1092
1093   d = BUS_CONNECTION_DATA (connection);
1094
1095   _dbus_assert (d != NULL);
1096
1097   return bus_context_get_registry (d->connections->context);
1098 }
1099
1100 BusActivation*
1101 bus_connection_get_activation (DBusConnection *connection)
1102 {
1103   BusConnectionData *d;
1104
1105   d = BUS_CONNECTION_DATA (connection);
1106
1107   _dbus_assert (d != NULL);
1108
1109   return bus_context_get_activation (d->connections->context);
1110 }
1111
1112 BusMatchmaker*
1113 bus_connection_get_matchmaker (DBusConnection *connection)
1114 {
1115   BusConnectionData *d;
1116
1117   d = BUS_CONNECTION_DATA (connection);
1118
1119   _dbus_assert (d != NULL);
1120
1121   return bus_context_get_matchmaker (d->connections->context);
1122 }
1123
1124 BusSELinuxID*
1125 bus_connection_get_selinux_id (DBusConnection *connection)
1126 {
1127   BusConnectionData *d;
1128
1129   d = BUS_CONNECTION_DATA (connection);
1130
1131   _dbus_assert (d != NULL);
1132
1133   return d->selinux_id;
1134 }
1135
1136 /**
1137  * Checks whether the connection is registered with the message bus.
1138  *
1139  * @param connection the connection
1140  * @returns #TRUE if we're an active message bus participant
1141  */
1142 dbus_bool_t
1143 bus_connection_is_active (DBusConnection *connection)
1144 {
1145   BusConnectionData *d;
1146
1147   d = BUS_CONNECTION_DATA (connection);
1148
1149   return d != NULL && d->name != NULL;
1150 }
1151
1152 dbus_bool_t
1153 bus_connection_preallocate_oom_error (DBusConnection *connection)
1154 {
1155   DBusMessage *message;
1156   DBusPreallocatedSend *preallocated;
1157   BusConnectionData *d;
1158
1159   d = BUS_CONNECTION_DATA (connection);
1160
1161   _dbus_assert (d != NULL);
1162
1163   if (d->oom_preallocated != NULL)
1164     return TRUE;
1165
1166   preallocated = dbus_connection_preallocate_send (connection);
1167   if (preallocated == NULL)
1168     return FALSE;
1169
1170   message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1171
1172   if (message == NULL)
1173     {
1174       dbus_connection_free_preallocated_send (connection, preallocated);
1175       return FALSE;
1176     }
1177
1178   /* d->name may be NULL, but that is OK */
1179   if (!dbus_message_set_error_name (message, DBUS_ERROR_NO_MEMORY) ||
1180       !dbus_message_set_destination (message, d->name) ||
1181       !dbus_message_set_sender (message,
1182                                 DBUS_SERVICE_DBUS))
1183     {
1184       dbus_connection_free_preallocated_send (connection, preallocated);
1185       dbus_message_unref (message);
1186       return FALSE;
1187     }
1188
1189   /* set reply serial to placeholder value just so space is already allocated
1190    * for it.
1191    */
1192   if (!dbus_message_set_reply_serial (message, 14))
1193     {
1194       dbus_connection_free_preallocated_send (connection, preallocated);
1195       dbus_message_unref (message);
1196       return FALSE;
1197     }
1198
1199   d->oom_message = message;
1200   d->oom_preallocated = preallocated;
1201
1202   return TRUE;
1203 }
1204
1205 void
1206 bus_connection_send_oom_error (DBusConnection *connection,
1207                                DBusMessage    *in_reply_to)
1208 {
1209   BusConnectionData *d;
1210
1211   d = BUS_CONNECTION_DATA (connection);
1212
1213   _dbus_assert (d != NULL);
1214   _dbus_assert (d->oom_message != NULL);
1215
1216   /* should always succeed since we set it to a placeholder earlier */
1217   if (!dbus_message_set_reply_serial (d->oom_message,
1218                                       dbus_message_get_serial (in_reply_to)))
1219     _dbus_assert_not_reached ("Failed to set reply serial for preallocated oom message");
1220
1221   _dbus_assert (dbus_message_get_sender (d->oom_message) != NULL);
1222
1223   dbus_connection_send_preallocated (connection, d->oom_preallocated,
1224                                      d->oom_message, NULL);
1225
1226   dbus_message_unref (d->oom_message);
1227   d->oom_message = NULL;
1228   d->oom_preallocated = NULL;
1229 }
1230
1231 #ifdef DBUS_ENABLE_STATS
1232 static void
1233 update_peak (int *peak,
1234              int n)
1235 {
1236   if (*peak < n)
1237     *peak = n;
1238 }
1239 #endif
1240
1241 void
1242 bus_connection_add_match_rule_link (DBusConnection *connection,
1243                                     DBusList       *link)
1244 {
1245   BusConnectionData *d;
1246
1247   d = BUS_CONNECTION_DATA (connection);
1248   _dbus_assert (d != NULL);
1249
1250   _dbus_list_append_link (&d->match_rules, link);
1251
1252   d->n_match_rules += 1;
1253
1254 #ifdef DBUS_ENABLE_STATS
1255   update_peak (&d->peak_match_rules, d->n_match_rules);
1256   update_peak (&d->connections->peak_match_rules_per_conn, d->n_match_rules);
1257
1258   d->connections->total_match_rules += 1;
1259   update_peak (&d->connections->peak_match_rules,
1260                d->connections->total_match_rules);
1261 #endif
1262 }
1263
1264 dbus_bool_t
1265 bus_connection_add_match_rule (DBusConnection *connection,
1266                                BusMatchRule   *rule)
1267 {
1268     DBusList *link;
1269
1270   link = _dbus_list_alloc_link (rule);
1271
1272   if (link == NULL)
1273     return FALSE;
1274
1275   bus_connection_add_match_rule_link (connection, link);
1276
1277   return TRUE;
1278 }
1279
1280 void
1281 bus_connection_remove_match_rule (DBusConnection *connection,
1282                                   BusMatchRule   *rule)
1283 {
1284   BusConnectionData *d;
1285
1286   d = BUS_CONNECTION_DATA (connection);
1287   _dbus_assert (d != NULL);
1288
1289   _dbus_list_remove_last (&d->match_rules, rule);
1290
1291   d->n_match_rules -= 1;
1292   _dbus_assert (d->n_match_rules >= 0);
1293
1294 #ifdef DBUS_ENABLE_STATS
1295   d->connections->total_match_rules -= 1;
1296 #endif
1297 }
1298
1299 int
1300 bus_connection_get_n_match_rules (DBusConnection *connection)
1301 {
1302   BusConnectionData *d;
1303
1304   d = BUS_CONNECTION_DATA (connection);
1305   _dbus_assert (d != NULL);
1306
1307   return d->n_match_rules;
1308 }
1309
1310 void
1311 bus_connection_add_owned_service_link (DBusConnection *connection,
1312                                        DBusList       *link)
1313 {
1314   BusConnectionData *d;
1315
1316   d = BUS_CONNECTION_DATA (connection);
1317   _dbus_assert (d != NULL);
1318
1319   _dbus_list_append_link (&d->services_owned, link);
1320
1321   d->n_services_owned += 1;
1322
1323 #ifdef DBUS_ENABLE_STATS
1324   update_peak (&d->peak_bus_names, d->n_services_owned);
1325   update_peak (&d->connections->peak_bus_names_per_conn,
1326                d->n_services_owned);
1327
1328   d->connections->total_bus_names += 1;
1329   update_peak (&d->connections->peak_bus_names,
1330                d->connections->total_bus_names);
1331 #endif
1332 }
1333
1334 dbus_bool_t
1335 bus_connection_add_owned_service (DBusConnection *connection,
1336                                   BusService     *service)
1337 {
1338   DBusList *link;
1339
1340   link = _dbus_list_alloc_link (service);
1341
1342   if (link == NULL)
1343     return FALSE;
1344
1345   bus_connection_add_owned_service_link (connection, link);
1346
1347   return TRUE;
1348 }
1349
1350 void
1351 bus_connection_remove_owned_service (DBusConnection *connection,
1352                                      BusService     *service)
1353 {
1354   BusConnectionData *d;
1355
1356   d = BUS_CONNECTION_DATA (connection);
1357   _dbus_assert (d != NULL);
1358
1359   _dbus_list_remove_last (&d->services_owned, service);
1360
1361   d->n_services_owned -= 1;
1362   _dbus_assert (d->n_services_owned >= 0);
1363
1364 #ifdef DBUS_ENABLE_STATS
1365   d->connections->total_bus_names -= 1;
1366 #endif
1367 }
1368
1369 int
1370 bus_connection_get_n_services_owned (DBusConnection *connection)
1371 {
1372   BusConnectionData *d;
1373
1374   d = BUS_CONNECTION_DATA (connection);
1375   _dbus_assert (d != NULL);
1376
1377   return d->n_services_owned;
1378 }
1379
1380 DBusList**
1381 bus_connection_get_services_owned (DBusConnection *connection)
1382 {
1383     BusConnectionData *d;
1384     d = BUS_CONNECTION_DATA (connection);
1385     _dbus_assert (d != NULL);
1386
1387     return &d->services_owned;
1388 }
1389
1390 dbus_bool_t
1391 bus_connection_complete (DBusConnection   *connection,
1392                          const DBusString *name,
1393                          DBusError        *error)
1394 {
1395   BusConnectionData *d;
1396   unsigned long uid;
1397
1398   d = BUS_CONNECTION_DATA (connection);
1399   _dbus_assert (d != NULL);
1400   _dbus_assert (d->name == NULL);
1401   _dbus_assert (d->policy == NULL);
1402
1403   _dbus_assert (!bus_connection_is_active (connection));
1404
1405   if (!_dbus_string_copy_data (name, &d->name))
1406     {
1407       BUS_SET_OOM (error);
1408       return FALSE;
1409     }
1410
1411   _dbus_assert (d->name != NULL);
1412
1413   _dbus_verbose ("Name %s assigned to %p\n", d->name, connection);
1414
1415   d->policy = bus_context_create_client_policy (d->connections->context,
1416                                                 connection,
1417                                                 error);
1418
1419   /* we may have a NULL policy on OOM or error getting list of
1420    * groups for a user. In the latter case we don't handle it so
1421    * well currently, as it will just keep failing over and over.
1422    */
1423
1424   if (d->policy == NULL)
1425     {
1426       _dbus_verbose ("Failed to create security policy for connection %p\n",
1427                      connection);
1428       _DBUS_ASSERT_ERROR_IS_SET (error);
1429       dbus_free (d->name);
1430       d->name = NULL;
1431       return FALSE;
1432     }
1433
1434   if (dbus_connection_get_unix_user (connection, &uid))
1435     {
1436       if (!adjust_connections_for_uid (d->connections,
1437                                        uid, 1))
1438         goto fail;
1439     }
1440
1441   /* Create and cache a string which holds information about the
1442    * peer process; used for logging purposes.
1443    */
1444   if (!cache_peer_loginfo_string (d, connection))
1445     goto fail;
1446
1447   /* Now the connection is active, move it between lists */
1448   _dbus_list_unlink (&d->connections->incomplete,
1449                      d->link_in_connection_list);
1450   d->connections->n_incomplete -= 1;
1451   _dbus_list_append_link (&d->connections->completed,
1452                           d->link_in_connection_list);
1453   d->connections->n_completed += 1;
1454
1455   _dbus_assert (d->connections->n_incomplete >= 0);
1456   _dbus_assert (d->connections->n_completed > 0);
1457
1458   /* See if we can remove the timeout */
1459   bus_connections_expire_incomplete (d->connections);
1460
1461   _dbus_assert (bus_connection_is_active (connection));
1462
1463   return TRUE;
1464 fail:
1465   BUS_SET_OOM (error);
1466   dbus_free (d->name);
1467   d->name = NULL;
1468   if (d->policy)
1469     bus_client_policy_unref (d->policy);
1470   d->policy = NULL;
1471   return FALSE;
1472 }
1473
1474 const char *
1475 bus_connection_get_name (DBusConnection *connection)
1476 {
1477   BusConnectionData *d;
1478
1479   d = BUS_CONNECTION_DATA (connection);
1480   _dbus_assert (d != NULL);
1481
1482   return d->name;
1483 }
1484
1485 /**
1486  * Check whether completing the passed-in connection would
1487  * exceed limits, and if so set error and return #FALSE
1488  */
1489 dbus_bool_t
1490 bus_connections_check_limits (BusConnections  *connections,
1491                               DBusConnection  *requesting_completion,
1492                               DBusError       *error)
1493 {
1494   unsigned long uid;
1495
1496   if (connections->n_completed >=
1497       bus_context_get_max_completed_connections (connections->context))
1498     {
1499       dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1500                       "The maximum number of active connections has been reached");
1501       return FALSE;
1502     }
1503
1504   if (dbus_connection_get_unix_user (requesting_completion, &uid))
1505     {
1506       if (get_connections_for_uid (connections, uid) >=
1507           bus_context_get_max_connections_per_user (connections->context))
1508         {
1509           dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1510                           "The maximum number of active connections for UID %lu has been reached",
1511                           uid);
1512           return FALSE;
1513         }
1514     }
1515
1516   return TRUE;
1517 }
1518
1519 static void
1520 bus_pending_reply_free (BusPendingReply *pending)
1521 {
1522   _dbus_verbose ("Freeing pending reply %p, replier %p receiver %p serial %u\n",
1523                  pending,
1524                  pending->will_send_reply,
1525                  pending->will_get_reply,
1526                  pending->reply_serial);
1527
1528   dbus_free (pending);
1529 }
1530
1531 static dbus_bool_t
1532 bus_pending_reply_send_no_reply (BusConnections  *connections,
1533                                  BusTransaction  *transaction,
1534                                  BusPendingReply *pending)
1535 {
1536   DBusMessage *message;
1537   DBusMessageIter iter;
1538   dbus_bool_t retval;
1539   const char *errmsg;
1540
1541   retval = FALSE;
1542
1543   message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1544   if (message == NULL)
1545     return FALSE;
1546
1547   dbus_message_set_no_reply (message, TRUE);
1548
1549   if (!dbus_message_set_reply_serial (message,
1550                                       pending->reply_serial))
1551     goto out;
1552
1553   if (!dbus_message_set_error_name (message,
1554                                     DBUS_ERROR_NO_REPLY))
1555     goto out;
1556
1557   errmsg = "Message did not receive a reply (timeout by message bus)";
1558   dbus_message_iter_init_append (message, &iter);
1559   if (!dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &errmsg))
1560     goto out;
1561
1562   if (!bus_transaction_send_from_driver (transaction, pending->will_get_reply,
1563                                          message))
1564     goto out;
1565
1566   retval = TRUE;
1567
1568  out:
1569   dbus_message_unref (message);
1570   return retval;
1571 }
1572
1573 static dbus_bool_t
1574 bus_pending_reply_expired (BusExpireList *list,
1575                            DBusList      *link,
1576                            void          *data)
1577 {
1578   BusPendingReply *pending = link->data;
1579   BusConnections *connections = data;
1580   BusTransaction *transaction;
1581
1582   /* No reply is forthcoming. So nuke it if we can. If not,
1583    * leave it in the list to try expiring again later when we
1584    * get more memory.
1585    */
1586
1587   _dbus_verbose ("Expiring pending reply %p, replier %p receiver %p serial %u\n",
1588                  pending,
1589                  pending->will_send_reply,
1590                  pending->will_get_reply,
1591                  pending->reply_serial);
1592
1593   transaction = bus_transaction_new (connections->context);
1594   if (transaction == NULL)
1595     return FALSE;
1596
1597   if (!bus_pending_reply_send_no_reply (connections,
1598                                         transaction,
1599                                         pending))
1600     {
1601       bus_transaction_cancel_and_free (transaction);
1602       return FALSE;
1603     }
1604
1605   bus_expire_list_remove_link (connections->pending_replies, link);
1606
1607   bus_pending_reply_free (pending);
1608   bus_transaction_execute_and_free (transaction);
1609
1610   return TRUE;
1611 }
1612
1613 static void
1614 bus_connection_drop_pending_replies (BusConnections  *connections,
1615                                      DBusConnection  *connection)
1616 {
1617   /* The DBusConnection is almost 100% finalized here, so you can't
1618    * do anything with it except check for pointer equality
1619    */
1620   DBusList *link;
1621
1622   _dbus_verbose ("Dropping pending replies that involve connection %p\n",
1623                  connection);
1624
1625   link = bus_expire_list_get_first_link (connections->pending_replies);
1626   while (link != NULL)
1627     {
1628       DBusList *next;
1629       BusPendingReply *pending;
1630
1631       next = bus_expire_list_get_next_link (connections->pending_replies,
1632                                             link);
1633       pending = link->data;
1634
1635       if (pending->will_get_reply == connection)
1636         {
1637           /* We don't need to track this pending reply anymore */
1638
1639           _dbus_verbose ("Dropping pending reply %p, replier %p receiver %p serial %u\n",
1640                          pending,
1641                          pending->will_send_reply,
1642                          pending->will_get_reply,
1643                          pending->reply_serial);
1644
1645           bus_expire_list_remove_link (connections->pending_replies,
1646                                        link);
1647           bus_pending_reply_free (pending);
1648         }
1649       else if (pending->will_send_reply == connection)
1650         {
1651           /* The reply isn't going to be sent, so set things
1652            * up so it will be expired right away
1653            */
1654           _dbus_verbose ("Will expire pending reply %p, replier %p receiver %p serial %u\n",
1655                          pending,
1656                          pending->will_send_reply,
1657                          pending->will_get_reply,
1658                          pending->reply_serial);
1659
1660           pending->will_send_reply = NULL;
1661           pending->expire_item.added_tv_sec = 0;
1662           pending->expire_item.added_tv_usec = 0;
1663
1664           bus_expire_list_recheck_immediately (connections->pending_replies);
1665         }
1666
1667       link = next;
1668     }
1669 }
1670
1671
1672 typedef struct
1673 {
1674   BusPendingReply *pending;
1675   BusConnections  *connections;
1676 } CancelPendingReplyData;
1677
1678 static void
1679 cancel_pending_reply (void *data)
1680 {
1681   CancelPendingReplyData *d = data;
1682
1683   _dbus_verbose ("d = %p\n", d);
1684
1685   if (!bus_expire_list_remove (d->connections->pending_replies,
1686                                &d->pending->expire_item))
1687     _dbus_assert_not_reached ("pending reply did not exist to be cancelled");
1688
1689   bus_pending_reply_free (d->pending); /* since it's been cancelled */
1690 }
1691
1692 static void
1693 cancel_pending_reply_data_free (void *data)
1694 {
1695   CancelPendingReplyData *d = data;
1696
1697   _dbus_verbose ("d = %p\n", d);
1698
1699   /* d->pending should be either freed or still
1700    * in the list of pending replies (owned by someone
1701    * else)
1702    */
1703
1704   dbus_free (d);
1705 }
1706
1707 /*
1708  * Record that a reply is allowed; return TRUE on success.
1709  */
1710 dbus_bool_t
1711 bus_connections_expect_reply (BusConnections  *connections,
1712                               BusTransaction  *transaction,
1713                               DBusConnection  *will_get_reply,
1714                               DBusConnection  *will_send_reply,
1715                               DBusMessage     *reply_to_this,
1716                               DBusError       *error)
1717 {
1718   BusPendingReply *pending;
1719   dbus_uint32_t reply_serial;
1720   DBusList *link;
1721   CancelPendingReplyData *cprd;
1722   int count;
1723
1724   _dbus_assert (will_get_reply != NULL);
1725   _dbus_assert (will_send_reply != NULL);
1726   _dbus_assert (reply_to_this != NULL);
1727
1728   if (dbus_message_get_no_reply (reply_to_this))
1729     return TRUE; /* we won't allow a reply, since client doesn't care for one. */
1730
1731   reply_serial = dbus_message_get_serial (reply_to_this);
1732
1733   link = bus_expire_list_get_first_link (connections->pending_replies);
1734   count = 0;
1735   while (link != NULL)
1736     {
1737       pending = link->data;
1738
1739       if (pending->reply_serial == reply_serial &&
1740           pending->will_get_reply == will_get_reply &&
1741           pending->will_send_reply == will_send_reply)
1742         {
1743           dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1744                           "Message has the same reply serial as a currently-outstanding existing method call");
1745           return FALSE;
1746         }
1747
1748       link = bus_expire_list_get_next_link (connections->pending_replies,
1749                                             link);
1750       if (pending->will_get_reply == will_get_reply)
1751         ++count;
1752     }
1753
1754   if (count >=
1755       bus_context_get_max_replies_per_connection (connections->context))
1756     {
1757       dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1758                       "The maximum number of pending replies per connection has been reached");
1759       return FALSE;
1760     }
1761
1762   pending = dbus_new0 (BusPendingReply, 1);
1763   if (pending == NULL)
1764     {
1765       BUS_SET_OOM (error);
1766       return FALSE;
1767     }
1768
1769 #ifdef DBUS_ENABLE_VERBOSE_MODE
1770   /* so we can see a not-yet-added pending reply */
1771   pending->expire_item.added_tv_sec = 1;
1772   pending->expire_item.added_tv_usec = 1;
1773 #endif
1774
1775   pending->will_get_reply = will_get_reply;
1776   pending->will_send_reply = will_send_reply;
1777   pending->reply_serial = reply_serial;
1778
1779   cprd = dbus_new0 (CancelPendingReplyData, 1);
1780   if (cprd == NULL)
1781     {
1782       BUS_SET_OOM (error);
1783       bus_pending_reply_free (pending);
1784       return FALSE;
1785     }
1786
1787   if (!bus_expire_list_add (connections->pending_replies,
1788                             &pending->expire_item))
1789     {
1790       BUS_SET_OOM (error);
1791       dbus_free (cprd);
1792       bus_pending_reply_free (pending);
1793       return FALSE;
1794     }
1795
1796   if (!bus_transaction_add_cancel_hook (transaction,
1797                                         cancel_pending_reply,
1798                                         cprd,
1799                                         cancel_pending_reply_data_free))
1800     {
1801       BUS_SET_OOM (error);
1802       bus_expire_list_remove (connections->pending_replies, &pending->expire_item);
1803       dbus_free (cprd);
1804       bus_pending_reply_free (pending);
1805       return FALSE;
1806     }
1807
1808   cprd->pending = pending;
1809   cprd->connections = connections;
1810
1811   _dbus_get_monotonic_time (&pending->expire_item.added_tv_sec,
1812                             &pending->expire_item.added_tv_usec);
1813
1814   _dbus_verbose ("Added pending reply %p, replier %p receiver %p serial %u\n",
1815                  pending,
1816                  pending->will_send_reply,
1817                  pending->will_get_reply,
1818                  pending->reply_serial);
1819
1820   return TRUE;
1821 }
1822
1823 typedef struct
1824 {
1825   DBusList        *link;
1826   BusConnections  *connections;
1827 } CheckPendingReplyData;
1828
1829 static void
1830 cancel_check_pending_reply (void *data)
1831 {
1832   CheckPendingReplyData *d = data;
1833
1834   _dbus_verbose ("d = %p\n",d);
1835
1836   bus_expire_list_add_link (d->connections->pending_replies,
1837                             d->link);
1838   d->link = NULL;
1839 }
1840
1841 static void
1842 check_pending_reply_data_free (void *data)
1843 {
1844   CheckPendingReplyData *d = data;
1845
1846   _dbus_verbose ("d = %p\n",d);
1847
1848   if (d->link != NULL)
1849     {
1850       BusPendingReply *pending = d->link->data;
1851
1852       _dbus_assert (!bus_expire_list_contains_item (d->connections->pending_replies,
1853                                                     &pending->expire_item));
1854
1855       bus_pending_reply_free (pending);
1856       _dbus_list_free_link (d->link);
1857     }
1858
1859   dbus_free (d);
1860 }
1861
1862 /*
1863  * Check whether a reply is allowed, remove BusPendingReply
1864  * if so, return TRUE if so.
1865  */
1866 dbus_bool_t
1867 bus_connections_check_reply (BusConnections *connections,
1868                              BusTransaction *transaction,
1869                              DBusConnection *sending_reply,
1870                              DBusConnection *receiving_reply,
1871                              DBusMessage    *reply,
1872                              DBusError      *error)
1873 {
1874   CheckPendingReplyData *cprd;
1875   DBusList *link;
1876   dbus_uint32_t reply_serial;
1877
1878   _dbus_assert (sending_reply != NULL);
1879   _dbus_assert (receiving_reply != NULL);
1880
1881   reply_serial = dbus_message_get_reply_serial (reply);
1882
1883   link = bus_expire_list_get_first_link (connections->pending_replies);
1884   while (link != NULL)
1885     {
1886       BusPendingReply *pending = link->data;
1887
1888       if (pending->reply_serial == reply_serial &&
1889           pending->will_get_reply == receiving_reply &&
1890           pending->will_send_reply == sending_reply)
1891         {
1892           _dbus_verbose ("Found pending reply with serial %u\n", reply_serial);
1893           break;
1894         }
1895
1896       link = bus_expire_list_get_next_link (connections->pending_replies,
1897                                             link);
1898     }
1899
1900   if (link == NULL)
1901     {
1902       _dbus_verbose ("No pending reply expected\n");
1903
1904       return FALSE;
1905     }
1906
1907   cprd = dbus_new0 (CheckPendingReplyData, 1);
1908   if (cprd == NULL)
1909     {
1910       BUS_SET_OOM (error);
1911       return FALSE;
1912     }
1913
1914   if (!bus_transaction_add_cancel_hook (transaction,
1915                                         cancel_check_pending_reply,
1916                                         cprd,
1917                                         check_pending_reply_data_free))
1918     {
1919       BUS_SET_OOM (error);
1920       dbus_free (cprd);
1921       return FALSE;
1922     }
1923
1924   cprd->link = link;
1925   cprd->connections = connections;
1926
1927   bus_expire_list_unlink (connections->pending_replies,
1928                           link);
1929
1930   _dbus_assert (!bus_expire_list_contains_item (connections->pending_replies, link->data));
1931
1932   return TRUE;
1933 }
1934
1935 /*
1936  * Transactions
1937  *
1938  * Note that this is fairly fragile; in particular, don't try to use
1939  * one transaction across any main loop iterations.
1940  */
1941
1942 typedef struct
1943 {
1944   BusTransaction *transaction;
1945   DBusMessage    *message;
1946   DBusPreallocatedSend *preallocated;
1947 } MessageToSend;
1948
1949 typedef struct
1950 {
1951   BusTransactionCancelFunction cancel_function;
1952   DBusFreeFunction free_data_function;
1953   void *data;
1954 } CancelHook;
1955
1956 struct BusTransaction
1957 {
1958   DBusList *connections;
1959   BusContext *context;
1960   DBusList *cancel_hooks;
1961 };
1962
1963 static void
1964 message_to_send_free (DBusConnection *connection,
1965                       MessageToSend  *to_send)
1966 {
1967   if (to_send->message)
1968     dbus_message_unref (to_send->message);
1969
1970   if (to_send->preallocated)
1971     dbus_connection_free_preallocated_send (connection, to_send->preallocated);
1972
1973   dbus_free (to_send);
1974 }
1975
1976 static void
1977 cancel_hook_cancel (void *element,
1978                     void *data)
1979 {
1980   CancelHook *ch = element;
1981
1982   _dbus_verbose ("Running transaction cancel hook\n");
1983
1984   if (ch->cancel_function)
1985     (* ch->cancel_function) (ch->data);
1986 }
1987
1988 static void
1989 cancel_hook_free (void *element,
1990                   void *data)
1991 {
1992   CancelHook *ch = element;
1993
1994   if (ch->free_data_function)
1995     (* ch->free_data_function) (ch->data);
1996
1997   dbus_free (ch);
1998 }
1999
2000 static void
2001 free_cancel_hooks (BusTransaction *transaction)
2002 {
2003   _dbus_list_foreach (&transaction->cancel_hooks,
2004                       cancel_hook_free, NULL);
2005
2006   _dbus_list_clear (&transaction->cancel_hooks);
2007 }
2008
2009 BusTransaction*
2010 bus_transaction_new (BusContext *context)
2011 {
2012   BusTransaction *transaction;
2013
2014   transaction = dbus_new0 (BusTransaction, 1);
2015   if (transaction == NULL)
2016     return NULL;
2017
2018   transaction->context = context;
2019
2020   return transaction;
2021 }
2022
2023 BusContext*
2024 bus_transaction_get_context (BusTransaction  *transaction)
2025 {
2026   return transaction->context;
2027 }
2028
2029 BusConnections*
2030 bus_transaction_get_connections (BusTransaction  *transaction)
2031 {
2032   return bus_context_get_connections (transaction->context);
2033 }
2034
2035 dbus_bool_t
2036 bus_transaction_send_from_driver (BusTransaction *transaction,
2037                                   DBusConnection *connection,
2038                                   DBusMessage    *message)
2039 {
2040   /* We have to set the sender to the driver, and have
2041    * to check security policy since it was not done in
2042    * dispatch.c
2043    */
2044   _dbus_verbose ("Sending %s %s %s from driver\n",
2045                  dbus_message_get_interface (message) ?
2046                  dbus_message_get_interface (message) : "(no interface)",
2047                  dbus_message_get_member (message) ?
2048                  dbus_message_get_member (message) : "(no member)",
2049                  dbus_message_get_error_name (message) ?
2050                  dbus_message_get_error_name (message) : "(no error name)");
2051
2052   if (!dbus_message_set_sender (message, DBUS_SERVICE_DBUS))
2053     return FALSE;
2054
2055   if(!bus_context_is_kdbus(bus_transaction_get_context (transaction))) /* we can't set destination on the basis of connection when on kdbus*/
2056     if (bus_connection_is_active (connection))
2057     {
2058       if (!dbus_message_set_destination (message,
2059                                          bus_connection_get_name (connection)))
2060         return FALSE;
2061     }
2062
2063   /* bus driver never wants a reply */
2064   dbus_message_set_no_reply (message, TRUE);
2065
2066   /* If security policy doesn't allow the message, we silently
2067    * eat it; the driver doesn't care about getting a reply.
2068    */
2069   if (!bus_context_check_security_policy (bus_transaction_get_context (transaction),
2070                                           transaction,
2071                                           NULL, connection, connection, message, NULL))
2072     return TRUE;
2073
2074   return bus_transaction_send (transaction, connection, message);
2075 }
2076
2077 dbus_bool_t
2078 bus_transaction_send (BusTransaction *transaction,
2079                       DBusConnection *connection,
2080                       DBusMessage    *message)
2081 {
2082   MessageToSend *to_send;
2083   BusConnectionData *d;
2084   DBusList *link;
2085
2086   _dbus_verbose ("  trying to add %s interface=%s member=%s error=%s to transaction%s\n",
2087                  dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_ERROR ? "error" :
2088                  dbus_message_get_reply_serial (message) != 0 ? "reply" :
2089                  "message",
2090                  dbus_message_get_interface (message) ?
2091                  dbus_message_get_interface (message) : "(unset)",
2092                  dbus_message_get_member (message) ?
2093                  dbus_message_get_member (message) : "(unset)",
2094                  dbus_message_get_error_name (message) ?
2095                  dbus_message_get_error_name (message) : "(unset)",
2096                  dbus_connection_get_is_connected (connection) ?
2097                  "" : " (disconnected)");
2098
2099   _dbus_assert (dbus_message_get_sender (message) != NULL);
2100
2101   if (!dbus_connection_get_is_connected (connection))
2102     return TRUE; /* silently ignore disconnected connections */
2103
2104   d = BUS_CONNECTION_DATA (connection);
2105   _dbus_assert (d != NULL);
2106
2107   to_send = dbus_new (MessageToSend, 1);
2108   if (to_send == NULL)
2109     {
2110       return FALSE;
2111     }
2112
2113   to_send->preallocated = dbus_connection_preallocate_send (connection);
2114   if (to_send->preallocated == NULL)
2115     {
2116       dbus_free (to_send);
2117       return FALSE;
2118     }
2119
2120   dbus_message_ref (message);
2121   to_send->message = message;
2122   to_send->transaction = transaction;
2123
2124   _dbus_verbose ("about to prepend message\n");
2125
2126   if (!_dbus_list_prepend (&d->transaction_messages, to_send))
2127     {
2128       message_to_send_free (connection, to_send);
2129       return FALSE;
2130     }
2131
2132   _dbus_verbose ("prepended message\n");
2133
2134   /* See if we already had this connection in the list
2135    * for this transaction. If we have a pending message,
2136    * then we should already be in transaction->connections
2137    */
2138   link = _dbus_list_get_first_link (&d->transaction_messages);
2139   _dbus_assert (link->data == to_send);
2140   link = _dbus_list_get_next_link (&d->transaction_messages, link);
2141   while (link != NULL)
2142     {
2143       MessageToSend *m = link->data;
2144       DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2145
2146       if (m->transaction == transaction)
2147         break;
2148
2149       link = next;
2150     }
2151
2152   if (link == NULL)
2153     {
2154       if (!_dbus_list_prepend (&transaction->connections, connection))
2155         {
2156           _dbus_list_remove (&d->transaction_messages, to_send);
2157           message_to_send_free (connection, to_send);
2158           return FALSE;
2159         }
2160     }
2161
2162   return TRUE;
2163 }
2164
2165 static void
2166 connection_cancel_transaction (DBusConnection *connection,
2167                                BusTransaction *transaction)
2168 {
2169   DBusList *link;
2170   BusConnectionData *d;
2171
2172   d = BUS_CONNECTION_DATA (connection);
2173   _dbus_assert (d != NULL);
2174
2175   link = _dbus_list_get_first_link (&d->transaction_messages);
2176   while (link != NULL)
2177     {
2178       MessageToSend *m = link->data;
2179       DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2180
2181       if (m->transaction == transaction)
2182         {
2183           _dbus_list_remove_link (&d->transaction_messages,
2184                                   link);
2185
2186           message_to_send_free (connection, m);
2187         }
2188
2189       link = next;
2190     }
2191 }
2192
2193 void
2194 bus_transaction_cancel_and_free (BusTransaction *transaction)
2195 {
2196   DBusConnection *connection;
2197
2198   _dbus_verbose ("TRANSACTION: cancelled\n");
2199
2200   while ((connection = _dbus_list_pop_first (&transaction->connections)))
2201     connection_cancel_transaction (connection, transaction);
2202
2203   _dbus_assert (transaction->connections == NULL);
2204
2205   _dbus_list_foreach (&transaction->cancel_hooks,
2206                       cancel_hook_cancel, NULL);
2207
2208   free_cancel_hooks (transaction);
2209
2210   dbus_free (transaction);
2211 }
2212
2213 static void
2214 connection_execute_transaction (DBusConnection *connection,
2215                                 BusTransaction *transaction)
2216 {
2217   DBusList *link;
2218   BusConnectionData *d;
2219
2220   d = BUS_CONNECTION_DATA (connection);
2221   _dbus_assert (d != NULL);
2222
2223   /* Send the queue in order (FIFO) */
2224   link = _dbus_list_get_last_link (&d->transaction_messages);
2225   while (link != NULL)
2226     {
2227       MessageToSend *m = link->data;
2228       DBusList *prev = _dbus_list_get_prev_link (&d->transaction_messages, link);
2229
2230       if (m->transaction == transaction)
2231         {
2232           _dbus_list_remove_link (&d->transaction_messages,
2233                                   link);
2234
2235           _dbus_assert (dbus_message_get_sender (m->message) != NULL);
2236
2237           dbus_connection_send_preallocated (connection,
2238                                              m->preallocated,
2239                                              m->message,
2240                                              NULL);
2241
2242           m->preallocated = NULL; /* so we don't double-free it */
2243
2244           message_to_send_free (connection, m);
2245         }
2246
2247       link = prev;
2248     }
2249 }
2250
2251 void
2252 bus_transaction_execute_and_free (BusTransaction *transaction)
2253 {
2254   /* For each connection in transaction->connections
2255    * send the messages
2256    */
2257   DBusConnection *connection;
2258
2259   _dbus_verbose ("TRANSACTION: executing\n");
2260
2261   while ((connection = _dbus_list_pop_first (&transaction->connections)))
2262     connection_execute_transaction (connection, transaction);
2263
2264   _dbus_assert (transaction->connections == NULL);
2265
2266   free_cancel_hooks (transaction);
2267
2268   dbus_free (transaction);
2269 }
2270
2271 void
2272 bus_transaction_free (BusTransaction *transaction)
2273 {
2274           free_cancel_hooks (transaction);
2275           dbus_free (transaction);
2276 }
2277
2278 static void
2279 bus_connection_remove_transactions (DBusConnection *connection)
2280 {
2281   MessageToSend *to_send;
2282   BusConnectionData *d;
2283
2284   d = BUS_CONNECTION_DATA (connection);
2285   _dbus_assert (d != NULL);
2286
2287   while ((to_send = _dbus_list_get_first (&d->transaction_messages)))
2288     {
2289       /* only has an effect for the first MessageToSend listing this transaction */
2290       _dbus_list_remove (&to_send->transaction->connections,
2291                          connection);
2292
2293       _dbus_list_remove (&d->transaction_messages, to_send);
2294       message_to_send_free (connection, to_send);
2295     }
2296 }
2297
2298 /**
2299  * Converts the DBusError to a message reply
2300  */
2301 dbus_bool_t
2302 bus_transaction_send_error_reply (BusTransaction  *transaction,
2303                                   DBusConnection  *connection,
2304                                   const DBusError *error,
2305                                   DBusMessage     *in_reply_to)
2306 {
2307   DBusMessage *reply;
2308
2309   _dbus_assert (error != NULL);
2310   _DBUS_ASSERT_ERROR_IS_SET (error);
2311
2312   _dbus_verbose ("Sending error reply %s \"%s\"\n",
2313                  error->name, error->message);
2314
2315   reply = dbus_message_new_error (in_reply_to,
2316                                   error->name,
2317                                   error->message);
2318   if (reply == NULL)
2319     return FALSE;
2320
2321   if (!bus_transaction_send_from_driver (transaction, connection, reply))
2322     {
2323       dbus_message_unref (reply);
2324       return FALSE;
2325     }
2326
2327   dbus_message_unref (reply);
2328
2329   return TRUE;
2330 }
2331
2332 dbus_bool_t
2333 bus_transaction_add_cancel_hook (BusTransaction               *transaction,
2334                                  BusTransactionCancelFunction  cancel_function,
2335                                  void                         *data,
2336                                  DBusFreeFunction              free_data_function)
2337 {
2338   CancelHook *ch;
2339
2340   ch = dbus_new (CancelHook, 1);
2341   if (ch == NULL)
2342     return FALSE;
2343
2344   _dbus_verbose ("     adding cancel hook function = %p data = %p\n",
2345                  cancel_function, data);
2346
2347   ch->cancel_function = cancel_function;
2348   ch->data = data;
2349   ch->free_data_function = free_data_function;
2350
2351   /* It's important that the hooks get run in reverse order that they
2352    * were added
2353    */
2354   if (!_dbus_list_prepend (&transaction->cancel_hooks, ch))
2355     {
2356       dbus_free (ch);
2357       return FALSE;
2358     }
2359
2360   return TRUE;
2361 }
2362
2363 #ifdef DBUS_ENABLE_STATS
2364 int
2365 bus_connections_get_n_active (BusConnections *connections)
2366 {
2367   return connections->n_completed;
2368 }
2369
2370 int
2371 bus_connections_get_n_incomplete (BusConnections *connections)
2372 {
2373   return connections->n_incomplete;
2374 }
2375
2376 int
2377 bus_connections_get_total_match_rules (BusConnections *connections)
2378 {
2379   return connections->total_match_rules;
2380 }
2381
2382 int
2383 bus_connections_get_peak_match_rules (BusConnections *connections)
2384 {
2385   return connections->peak_match_rules;
2386 }
2387
2388 int
2389 bus_connections_get_peak_match_rules_per_conn (BusConnections *connections)
2390 {
2391   return connections->peak_match_rules_per_conn;
2392 }
2393
2394 int
2395 bus_connections_get_total_bus_names (BusConnections *connections)
2396 {
2397   return connections->total_bus_names;
2398 }
2399
2400 int
2401 bus_connections_get_peak_bus_names (BusConnections *connections)
2402 {
2403   return connections->peak_bus_names;
2404 }
2405
2406 int
2407 bus_connections_get_peak_bus_names_per_conn (BusConnections *connections)
2408 {
2409   return connections->peak_bus_names_per_conn;
2410 }
2411
2412 int
2413 bus_connection_get_peak_match_rules (DBusConnection *connection)
2414 {
2415   BusConnectionData *d;
2416
2417   d = BUS_CONNECTION_DATA (connection);
2418   return d->peak_match_rules;
2419 }
2420
2421 int
2422 bus_connection_get_peak_bus_names (DBusConnection *connection)
2423 {
2424   BusConnectionData *d;
2425
2426   d = BUS_CONNECTION_DATA (connection);
2427   return d->peak_bus_names;
2428 }
2429 #endif /* DBUS_ENABLE_STATS */