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 #include <dbus/dbus-connection-internal.h>
  37
  38 /* Trim executed commands to this length; we want to keep logs readable */
  39 #define MAX_LOG_COMMAND_LEN 50
  40
  41 static void bus_connection_remove_transactions (DBusConnection *connection);
  42
  43 typedef struct
  44 {
  45   BusExpireItem expire_item;
  46
  47   DBusConnection *will_get_reply;
  48   DBusConnection *will_send_reply;
  49
  50   dbus_uint32_t reply_serial;
  51
  52 } BusPendingReply;
  53
  54 struct BusConnections
  55 {
  56   int refcount;
  57   DBusList *completed;  /**< List of all completed connections */
  58   int n_completed;      /**< Length of completed list */
  59   DBusList *incomplete; /**< List of all not-yet-active connections */
  60   int n_incomplete;     /**< Length of incomplete list */
  61   BusContext *context;
  62   DBusHashTable *completed_by_user; /**< Number of completed connections for each UID */
  63   DBusTimeout *expire_timeout; /**< Timeout for expiring incomplete connections. */
  64   int stamp;                   /**< Incrementing number */
  65   BusExpireList *pending_replies; /**< List of pending replies */
  66
  67 #ifdef DBUS_ENABLE_STATS
  68   int total_match_rules;
  69   int peak_match_rules;
  70   int peak_match_rules_per_conn;
  71
  72   int total_bus_names;
  73   int peak_bus_names;
  74   int peak_bus_names_per_conn;
  75 #endif
  76 };
  77
  78 static dbus_int32_t connection_data_slot = -1;
  79
  80 typedef struct
  81 {
  82   BusConnections *connections;
  83   DBusList *link_in_connection_list;
  84   DBusConnection *connection;
  85   DBusList *services_owned;
  86   int n_services_owned;
  87   DBusList *match_rules;
  88   int n_match_rules;
  89   char *name;
  90   DBusList *transaction_messages; /**< Stuff we need to send as part of a transaction */
  91   DBusMessage *oom_message;
  92   DBusPreallocatedSend *oom_preallocated;
  93   BusClientPolicy *policy;
  94
  95   char *cached_loginfo_string;
  96   BusSELinuxID *selinux_id;
  97
  98   long connection_tv_sec;  /**< Time when we connected (seconds component) */
  99   long connection_tv_usec; /**< Time when we connected (microsec component) */
 100   int stamp;               /**< connections->stamp last time we were traversed */
 101
 102 #ifdef DBUS_ENABLE_STATS
 103   int peak_match_rules;
 104   int peak_bus_names;
 105 #endif
 106   int n_pending_unix_fds;
 107   DBusTimeout *pending_unix_fds_timeout;
 108 } BusConnectionData;
 109
 110 static dbus_bool_t bus_pending_reply_expired (BusExpireList *list,
 111                                               DBusList      *link,
 112                                               void          *data);
 113
 114 static void bus_connection_drop_pending_replies (BusConnections  *connections,
 115                                                  DBusConnection  *connection);
 116
 117 static dbus_bool_t expire_incomplete_timeout (void *data);
 118
 119 #define BUS_CONNECTION_DATA(connection) (dbus_connection_get_data ((connection), connection_data_slot))
 120
 121 static DBusLoop*
 122 connection_get_loop (DBusConnection *connection)
 123 {
 124   BusConnectionData *d;
 125
 126   d = BUS_CONNECTION_DATA (connection);
 127
 128   return bus_context_get_loop (d->connections->context);
 129 }
 130
 131
 132 static int
 133 get_connections_for_uid (BusConnections *connections,
 134                          dbus_uid_t      uid)
 135 {
 136   void *val;
 137   int current_count;
 138
 139   /* val is NULL is 0 when it isn't in the hash yet */
 140
 141   val = _dbus_hash_table_lookup_uintptr (connections->completed_by_user,
 142                                        uid);
 143
 144   current_count = _DBUS_POINTER_TO_INT (val);
 145
 146   return current_count;
 147 }
 148
 149 static dbus_bool_t
 150 adjust_connections_for_uid (BusConnections *connections,
 151                             dbus_uid_t      uid,
 152                             int             adjustment)
 153 {
 154   int current_count;
 155
 156   current_count = get_connections_for_uid (connections, uid);
 157
 158   _dbus_verbose ("Adjusting connection count for UID " DBUS_UID_FORMAT
 159                  ": was %d adjustment %d making %d\n",
 160                  uid, current_count, adjustment, current_count + adjustment);
 161
 162   _dbus_assert (current_count >= 0);
 163
 164   current_count += adjustment;
 165
 166   _dbus_assert (current_count >= 0);
 167
 168   if (current_count == 0)
 169     {
 170       _dbus_hash_table_remove_uintptr (connections->completed_by_user, uid);
 171       return TRUE;
 172     }
 173   else
 174     {
 175       dbus_bool_t retval;
 176
 177       retval = _dbus_hash_table_insert_uintptr (connections->completed_by_user,
 178                                               uid, _DBUS_INT_TO_POINTER (current_count));
 179
 180       /* only positive adjustment can fail as otherwise
 181        * a hash entry should already exist
 182        */
 183       _dbus_assert (adjustment > 0 ||
 184                     (adjustment <= 0 && retval));
 185
 186       return retval;
 187     }
 188 }
 189
 190 void
 191 bus_connection_disconnected (DBusConnection *connection)
 192 {
 193   BusConnectionData *d;
 194   BusService *service;
 195   BusMatchmaker *matchmaker;
 196
 197   d = BUS_CONNECTION_DATA (connection);
 198   _dbus_assert (d != NULL);
 199
 200   _dbus_verbose ("%s disconnected, dropping all service ownership and releasing\n",
 201                  d->name ? d->name : "(inactive)");
 202
 203   /* Delete our match rules */
 204   if (d->n_match_rules > 0)
 205     {
 206       matchmaker = bus_context_get_matchmaker (d->connections->context);
 207       bus_matchmaker_disconnected (matchmaker, connection);
 208     }
 209
 210   /* Drop any service ownership. Unfortunately, this requires
 211    * memory allocation and there doesn't seem to be a good way to
 212    * handle it other than sleeping; we can't "fail" the operation of
 213    * disconnecting a client, and preallocating a broadcast "service is
 214    * now gone" message for every client-service pair seems kind of
 215    * involved.
 216    */
 217   while ((service = _dbus_list_get_last (&d->services_owned)))
 218     {
 219       BusTransaction *transaction;
 220       DBusError error;
 221
 222     retry:
 223
 224       dbus_error_init (&error);
 225
 226       while ((transaction = bus_transaction_new (d->connections->context)) == NULL)
 227         _dbus_wait_for_memory ();
 228
 229       if (!bus_service_remove_owner (service, connection,
 230                                      transaction, &error))
 231         {
 232           _DBUS_ASSERT_ERROR_IS_SET (&error);
 233
 234           if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY))
 235             {
 236               dbus_error_free (&error);
 237               bus_transaction_cancel_and_free (transaction);
 238               _dbus_wait_for_memory ();
 239               goto retry;
 240             }
 241           else
 242             {
 243               _dbus_verbose ("Failed to remove service owner: %s %s\n",
 244                              error.name, error.message);
 245               _dbus_assert_not_reached ("Removing service owner failed for non-memory-related reason");
 246             }
 247         }
 248
 249       bus_transaction_execute_and_free (transaction);
 250     }
 251
 252   bus_dispatch_remove_connection (connection);
 253
 254   /* no more watching */
 255   if (!dbus_connection_set_watch_functions (connection,
 256                                             NULL, NULL, NULL,
 257                                             connection,
 258                                             NULL))
 259     _dbus_assert_not_reached ("setting watch functions to NULL failed");
 260
 261   if (!dbus_connection_set_timeout_functions (connection,
 262                                               NULL, NULL, NULL,
 263                                               connection,
 264                                               NULL))
 265     _dbus_assert_not_reached ("setting timeout functions to NULL failed");
 266
 267   dbus_connection_set_unix_user_function (connection,
 268                                           NULL, NULL, NULL);
 269   dbus_connection_set_windows_user_function (connection,
 270                                              NULL, NULL, NULL);
 271
 272   dbus_connection_set_dispatch_status_function (connection,
 273                                                 NULL, NULL, NULL);
 274
 275   if (d->pending_unix_fds_timeout)
 276     {
 277       _dbus_loop_remove_timeout (bus_context_get_loop (d->connections->context),
 278                                  d->pending_unix_fds_timeout);
 279       _dbus_timeout_unref (d->pending_unix_fds_timeout);
 280     }
 281   d->pending_unix_fds_timeout = NULL;
 282   _dbus_connection_set_pending_fds_function (connection, NULL, NULL);
 283
 284   bus_connection_remove_transactions (connection);
 285
 286   if (d->link_in_connection_list != NULL)
 287     {
 288       if (d->name != NULL)
 289         {
 290           unsigned long uid;
 291
 292           _dbus_list_remove_link (&d->connections->completed, d->link_in_connection_list);
 293           d->link_in_connection_list = NULL;
 294           d->connections->n_completed -= 1;
 295
 296           if (dbus_connection_get_unix_user (connection, &uid))
 297             {
 298               if (!adjust_connections_for_uid (d->connections,
 299                                                uid, -1))
 300                 _dbus_assert_not_reached ("adjusting downward should never fail");
 301             }
 302         }
 303       else
 304         {
 305           _dbus_list_remove_link (&d->connections->incomplete, d->link_in_connection_list);
 306           d->link_in_connection_list = NULL;
 307           d->connections->n_incomplete -= 1;
 308
 309           /* If we have dropped below the max. number of incomplete
 310            * connections, start accept()ing again */
 311           bus_context_check_all_watches (d->connections->context);
 312         }
 313
 314       _dbus_assert (d->connections->n_incomplete >= 0);
 315       _dbus_assert (d->connections->n_completed >= 0);
 316     }
 317
 318   bus_connection_drop_pending_replies (d->connections, connection);
 319
 320   /* frees "d" as side effect */
 321   dbus_connection_set_data (connection,
 322                             connection_data_slot,
 323                             NULL, NULL);
 324
 325   dbus_connection_unref (connection);
 326 }
 327
 328 static dbus_bool_t
 329 add_connection_watch (DBusWatch      *watch,
 330                       void           *data)
 331 {
 332   DBusConnection *connection = data;
 333
 334   return _dbus_loop_add_watch (connection_get_loop (connection), watch);
 335 }
 336
 337 static void
 338 remove_connection_watch (DBusWatch      *watch,
 339                          void           *data)
 340 {
 341   DBusConnection *connection = data;
 342
 343   _dbus_loop_remove_watch (connection_get_loop (connection), watch);
 344 }
 345
 346 static void
 347 toggle_connection_watch (DBusWatch      *watch,
 348                          void           *data)
 349 {
 350   DBusConnection *connection = data;
 351
 352   _dbus_loop_toggle_watch (connection_get_loop (connection), watch);
 353 }
 354
 355 static dbus_bool_t
 356 add_connection_timeout (DBusTimeout    *timeout,
 357                         void           *data)
 358 {
 359   DBusConnection *connection = data;
 360
 361   return _dbus_loop_add_timeout (connection_get_loop (connection), timeout);
 362 }
 363
 364 static void
 365 remove_connection_timeout (DBusTimeout    *timeout,
 366                            void           *data)
 367 {
 368   DBusConnection *connection = data;
 369
 370   _dbus_loop_remove_timeout (connection_get_loop (connection), timeout);
 371 }
 372
 373 static void
 374 dispatch_status_function (DBusConnection    *connection,
 375                           DBusDispatchStatus new_status,
 376                           void              *data)
 377 {
 378   DBusLoop *loop = data;
 379
 380   if (new_status != DBUS_DISPATCH_COMPLETE)
 381     {
 382       while (!_dbus_loop_queue_dispatch (loop, connection))
 383         _dbus_wait_for_memory ();
 384     }
 385 }
 386
 387 static dbus_bool_t
 388 allow_unix_user_function (DBusConnection *connection,
 389                           unsigned long   uid,
 390                           void           *data)
 391 {
 392   BusConnectionData *d;
 393
 394   d = BUS_CONNECTION_DATA (connection);
 395
 396   _dbus_assert (d != NULL);
 397
 398   return bus_context_allow_unix_user (d->connections->context, uid);
 399 }
 400
 401 static void
 402 free_connection_data (void *data)
 403 {
 404   BusConnectionData *d = data;
 405
 406   /* services_owned should be NULL since we should be disconnected */
 407   _dbus_assert (d->services_owned == NULL);
 408   _dbus_assert (d->n_services_owned == 0);
 409   /* similarly */
 410   _dbus_assert (d->transaction_messages == NULL);
 411
 412   if (d->oom_preallocated)
 413     dbus_connection_free_preallocated_send (d->connection, d->oom_preallocated);
 414
 415   if (d->oom_message)
 416     dbus_message_unref (d->oom_message);
 417
 418   if (d->policy)
 419     bus_client_policy_unref (d->policy);
 420
 421   if (d->selinux_id)
 422     bus_selinux_id_unref (d->selinux_id);
 423
 424   dbus_free (d->cached_loginfo_string);
 425
 426   dbus_free (d->name);
 427
 428   dbus_free (d);
 429 }
 430
 431 BusConnections*
 432 bus_connections_new (BusContext *context)
 433 {
 434   BusConnections *connections;
 435
 436   if (!dbus_connection_allocate_data_slot (&connection_data_slot))
 437     goto failed_0;
 438
 439   connections = dbus_new0 (BusConnections, 1);
 440   if (connections == NULL)
 441     goto failed_1;
 442
 443   connections->completed_by_user = _dbus_hash_table_new (DBUS_HASH_UINTPTR,
 444                                                          NULL, NULL);
 445   if (connections->completed_by_user == NULL)
 446     goto failed_2;
 447
 448   connections->expire_timeout = _dbus_timeout_new (100, /* irrelevant */
 449                                                    expire_incomplete_timeout,
 450                                                    connections, NULL);
 451   if (connections->expire_timeout == NULL)
 452     goto failed_3;
 453
 454   _dbus_timeout_set_enabled (connections->expire_timeout, FALSE);
 455
 456   connections->pending_replies = bus_expire_list_new (bus_context_get_loop (context),
 457                                                       bus_context_get_reply_timeout (context),
 458                                                       bus_pending_reply_expired,
 459                                                       connections);
 460   if (connections->pending_replies == NULL)
 461     goto failed_4;
 462
 463   if (!_dbus_loop_add_timeout (bus_context_get_loop (context),
 464                                connections->expire_timeout))
 465     goto failed_5;
 466
 467   connections->refcount = 1;
 468   connections->context = context;
 469
 470   return connections;
 471
 472  failed_5:
 473   bus_expire_list_free (connections->pending_replies);
 474  failed_4:
 475   _dbus_timeout_unref (connections->expire_timeout);
 476  failed_3:
 477   _dbus_hash_table_unref (connections->completed_by_user);
 478  failed_2:
 479   dbus_free (connections);
 480  failed_1:
 481   dbus_connection_free_data_slot (&connection_data_slot);
 482  failed_0:
 483   return NULL;
 484 }
 485
 486 BusConnections *
 487 bus_connections_ref (BusConnections *connections)
 488 {
 489   _dbus_assert (connections->refcount > 0);
 490   connections->refcount += 1;
 491
 492   return connections;
 493 }
 494
 495 void
 496 bus_connections_unref (BusConnections *connections)
 497 {
 498   _dbus_assert (connections->refcount > 0);
 499   connections->refcount -= 1;
 500   if (connections->refcount == 0)
 501     {
 502       /* drop all incomplete */
 503       while (connections->incomplete != NULL)
 504         {
 505           DBusConnection *connection;
 506
 507           connection = connections->incomplete->data;
 508
 509           dbus_connection_ref (connection);
 510           dbus_connection_close (connection);
 511           bus_connection_disconnected (connection);
 512           dbus_connection_unref (connection);
 513         }
 514
 515       _dbus_assert (connections->n_incomplete == 0);
 516
 517       /* drop all real connections */
 518       while (connections->completed != NULL)
 519         {
 520           DBusConnection *connection;
 521
 522           connection = connections->completed->data;
 523
 524           dbus_connection_ref (connection);
 525           dbus_connection_close (connection);
 526           bus_connection_disconnected (connection);
 527           dbus_connection_unref (connection);
 528         }
 529
 530       _dbus_assert (connections->n_completed == 0);
 531
 532       bus_expire_list_free (connections->pending_replies);
 533
 534       _dbus_loop_remove_timeout (bus_context_get_loop (connections->context),
 535                                  connections->expire_timeout);
 536
 537       _dbus_timeout_unref (connections->expire_timeout);
 538
 539       _dbus_hash_table_unref (connections->completed_by_user);
 540
 541       dbus_free (connections);
 542
 543       dbus_connection_free_data_slot (&connection_data_slot);
 544     }
 545 }
 546
 547 /* Used for logging */
 548 static dbus_bool_t
 549 cache_peer_loginfo_string (BusConnectionData *d,
 550                            DBusConnection    *connection)
 551 {
 552   DBusString loginfo_buf;
 553   unsigned long uid;
 554   unsigned long pid;
 555   char *windows_sid;
 556   dbus_bool_t prev_added;
 557
 558   if (!_dbus_string_init (&loginfo_buf))
 559     return FALSE;
 560
 561   prev_added = FALSE;
 562   if (dbus_connection_get_unix_user (connection, &uid))
 563     {
 564       if (!_dbus_string_append_printf (&loginfo_buf, "uid=%ld", uid))
 565         goto oom;
 566       else
 567         prev_added = TRUE;
 568     }
 569
 570   if (dbus_connection_get_unix_process_id (connection, &pid))
 571     {
 572       if (prev_added)
 573         {
 574           if (!_dbus_string_append_byte (&loginfo_buf, ' '))
 575             goto oom;
 576         }
 577       if (!_dbus_string_append_printf (&loginfo_buf, "pid=%ld comm=\"", pid))
 578         goto oom;
 579       /* Ignore errors here; we may not have permissions to read the
 580        * proc file. */
 581       _dbus_command_for_pid (pid, &loginfo_buf, MAX_LOG_COMMAND_LEN, NULL);
 582       if (!_dbus_string_append_byte (&loginfo_buf, '"'))
 583         goto oom;
 584     }
 585
 586   if (dbus_connection_get_windows_user (connection, &windows_sid))
 587     {
 588       dbus_bool_t did_append;
 589       did_append = _dbus_string_append_printf (&loginfo_buf,
 590                                                "sid=\"%s\" ", windows_sid);
 591       dbus_free (windows_sid);
 592       if (!did_append)
 593         goto oom;
 594     }
 595
 596   if (!_dbus_string_steal_data (&loginfo_buf, &(d->cached_loginfo_string)))
 597     goto oom;
 598
 599   _dbus_string_free (&loginfo_buf);
 600
 601   return TRUE;
 602 oom:
 603    _dbus_string_free (&loginfo_buf);
 604    return FALSE;
 605 }
 606
 607 static void
 608 check_pending_fds_cb (DBusConnection *connection)
 609 {
 610   BusConnectionData *d = BUS_CONNECTION_DATA (connection);
 611   int n_pending_unix_fds_old = d->n_pending_unix_fds;
 612   int n_pending_unix_fds_new;
 613
 614   n_pending_unix_fds_new = _dbus_connection_get_pending_fds_count (connection);
 615
 616   _dbus_verbose ("Pending fds count changed on connection %p: %d -> %d\n",
 617                  connection, n_pending_unix_fds_old, n_pending_unix_fds_new);
 618
 619   if (n_pending_unix_fds_old == 0 && n_pending_unix_fds_new > 0)
 620     {
 621       _dbus_timeout_set_interval (d->pending_unix_fds_timeout,
 622               bus_context_get_pending_fd_timeout (d->connections->context));
 623       _dbus_timeout_set_enabled (d->pending_unix_fds_timeout, TRUE);
 624     }
 625
 626   if (n_pending_unix_fds_old > 0 && n_pending_unix_fds_new == 0)
 627     {
 628       _dbus_timeout_set_enabled (d->pending_unix_fds_timeout, FALSE);
 629     }
 630
 631
 632   d->n_pending_unix_fds = n_pending_unix_fds_new;
 633 }
 634
 635 static dbus_bool_t
 636 pending_unix_fds_timeout_cb (void *data)
 637 {
 638   DBusConnection *connection = data;
 639   dbus_connection_close (connection);
 640   return TRUE;
 641 }
 642
 643 dbus_bool_t
 644 bus_connections_setup_connection (BusConnections *connections,
 645                                   DBusConnection *connection)
 646 {
 647
 648   BusConnectionData *d;
 649   dbus_bool_t retval;
 650   DBusError error;
 651
 652
 653   d = dbus_new0 (BusConnectionData, 1);
 654
 655   if (d == NULL)
 656     return FALSE;
 657
 658   d->connections = connections;
 659   d->connection = connection;
 660
 661   _dbus_get_monotonic_time (&d->connection_tv_sec,
 662                             &d->connection_tv_usec);
 663
 664   _dbus_assert (connection_data_slot >= 0);
 665
 666   if (!dbus_connection_set_data (connection,
 667                                  connection_data_slot,
 668                                  d, free_connection_data))
 669     {
 670       dbus_free (d);
 671       return FALSE;
 672     }
 673
 674   dbus_connection_set_route_peer_messages (connection, TRUE);
 675
 676   retval = FALSE;
 677
 678   dbus_error_init (&error);
 679   d->selinux_id = bus_selinux_init_connection_id (connection,
 680                                                   &error);
 681   if (dbus_error_is_set (&error))
 682     {
 683       /* This is a bit bogus because we pretend all errors
 684        * are OOM; this is done because we know that in bus.c
 685        * an OOM error disconnects the connection, which is
 686        * the same thing we want on any other error.
 687        */
 688       dbus_error_free (&error);
 689       goto out;
 690     }
 691
 692   if (!dbus_connection_set_watch_functions (connection,
 693                                             add_connection_watch,
 694                                             remove_connection_watch,
 695                                             toggle_connection_watch,
 696                                             connection,
 697                                             NULL))
 698     goto out;
 699
 700   if (!dbus_connection_set_timeout_functions (connection,
 701                                               add_connection_timeout,
 702                                               remove_connection_timeout,
 703                                               NULL,
 704                                               connection, NULL))
 705     goto out;
 706
 707   /* For now we don't need to set a Windows user function because
 708    * there are no policies in the config file controlling what
 709    * Windows users can connect. The default 'same user that owns the
 710    * bus can connect' behavior of DBusConnection is fine on Windows.
 711    */
 712   dbus_connection_set_unix_user_function (connection,
 713                                           allow_unix_user_function,
 714                                           NULL, NULL);
 715
 716   dbus_connection_set_dispatch_status_function (connection,
 717                                                 dispatch_status_function,
 718                                                 bus_context_get_loop (connections->context),
 719                                                 NULL);
 720
 721   d->link_in_connection_list = _dbus_list_alloc_link (connection);
 722   if (d->link_in_connection_list == NULL)
 723     goto out;
 724
 725   /* Setup the connection with the dispatcher */
 726   if (!bus_dispatch_add_connection (connection))
 727     goto out;
 728
 729   if (dbus_connection_get_dispatch_status (connection) != DBUS_DISPATCH_COMPLETE)
 730     {
 731       if (!_dbus_loop_queue_dispatch (bus_context_get_loop (connections->context), connection))
 732         {
 733           bus_dispatch_remove_connection (connection);
 734           goto out;
 735         }
 736     }
 737
 738   /* Setup pending fds timeout (see #80559) */
 739   d->pending_unix_fds_timeout = _dbus_timeout_new (100, /* irrelevant */
 740                                                    pending_unix_fds_timeout_cb,
 741                                                    connection, NULL);
 742   if (d->pending_unix_fds_timeout == NULL)
 743     goto out;
 744
 745   _dbus_timeout_set_enabled (d->pending_unix_fds_timeout, FALSE);
 746   if (!_dbus_loop_add_timeout (bus_context_get_loop (connections->context),
 747                                d->pending_unix_fds_timeout))
 748     goto out;
 749
 750   _dbus_connection_set_pending_fds_function (connection,
 751           (DBusPendingFdsChangeFunction) check_pending_fds_cb,
 752           connection);
 753
 754   _dbus_list_append_link (&connections->incomplete, d->link_in_connection_list);
 755   connections->n_incomplete += 1;
 756
 757   dbus_connection_ref (connection);
 758
 759   bus_connections_expire_incomplete (connections);
 760
 761   /* The listening socket is removed from the main loop,
 762    * i.e. does not accept(), while n_incomplete is at its
 763    * maximum value; so we shouldn't get here in that case */
 764   _dbus_assert (connections->n_incomplete <=
 765       bus_context_get_max_incomplete_connections (connections->context));
 766
 767   /* If we have the maximum number of incomplete connections,
 768    * stop accept()ing any more, to avert a DoS. See fd.o #80919 */
 769   bus_context_check_all_watches (d->connections->context);
 770
 771   retval = TRUE;
 772
 773  out:
 774   if (!retval)
 775     {
 776       if (d->selinux_id)
 777         bus_selinux_id_unref (d->selinux_id);
 778       d->selinux_id = NULL;
 779
 780       if (!dbus_connection_set_watch_functions (connection,
 781                                                 NULL, NULL, NULL,
 782                                                 connection,
 783                                                 NULL))
 784         _dbus_assert_not_reached ("setting watch functions to NULL failed");
 785
 786       if (!dbus_connection_set_timeout_functions (connection,
 787                                                   NULL, NULL, NULL,
 788                                                   connection,
 789                                                   NULL))
 790         _dbus_assert_not_reached ("setting timeout functions to NULL failed");
 791
 792       dbus_connection_set_unix_user_function (connection,
 793                                               NULL, NULL, NULL);
 794
 795       dbus_connection_set_windows_user_function (connection,
 796                                                  NULL, NULL, NULL);
 797
 798       dbus_connection_set_dispatch_status_function (connection,
 799                                                     NULL, NULL, NULL);
 800
 801       if (d->pending_unix_fds_timeout)
 802         _dbus_timeout_unref (d->pending_unix_fds_timeout);
 803
 804       d->pending_unix_fds_timeout = NULL;
 805
 806       _dbus_connection_set_pending_fds_function (connection, NULL, NULL);
 807
 808       if (d->link_in_connection_list != NULL)
 809         {
 810           _dbus_assert (d->link_in_connection_list->next == NULL);
 811           _dbus_assert (d->link_in_connection_list->prev == NULL);
 812           _dbus_list_free_link (d->link_in_connection_list);
 813           d->link_in_connection_list = NULL;
 814         }
 815
 816       if (!dbus_connection_set_data (connection,
 817                                      connection_data_slot,
 818                                      NULL, NULL))
 819         _dbus_assert_not_reached ("failed to set connection data to null");
 820
 821       /* "d" has now been freed */
 822     }
 823
 824   return retval;
 825 }
 826
 827 void
 828 bus_connections_expire_incomplete (BusConnections *connections)
 829 {
 830   int next_interval;
 831
 832   next_interval = -1;
 833
 834   if (connections->incomplete != NULL)
 835     {
 836       long tv_sec, tv_usec;
 837       DBusList *link;
 838       int auth_timeout;
 839
 840       _dbus_get_monotonic_time (&tv_sec, &tv_usec);
 841       auth_timeout = bus_context_get_auth_timeout (connections->context);
 842
 843       link = _dbus_list_get_first_link (&connections->incomplete);
 844       while (link != NULL)
 845         {
 846           DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
 847           DBusConnection *connection;
 848           BusConnectionData *d;
 849           double elapsed;
 850
 851           connection = link->data;
 852
 853           d = BUS_CONNECTION_DATA (connection);
 854
 855           _dbus_assert (d != NULL);
 856
 857           elapsed = ELAPSED_MILLISECONDS_SINCE (d->connection_tv_sec,
 858                                                 d->connection_tv_usec,
 859                                                 tv_sec, tv_usec);
 860
 861           if (elapsed >= (double) auth_timeout)
 862             {
 863               _dbus_verbose ("Timing out authentication for connection %p\n", connection);
 864               dbus_connection_close (connection);
 865             }
 866           else
 867             {
 868               /* We can end the loop, since the connections are in oldest-first order */
 869               next_interval = ((double)auth_timeout) - elapsed;
 870               _dbus_verbose ("Connection %p authentication expires in %d milliseconds\n",
 871                              connection, next_interval);
 872
 873               break;
 874             }
 875
 876           link = next;
 877         }
 878     }
 879
 880   bus_expire_timeout_set_interval (connections->expire_timeout,
 881                                    next_interval);
 882 }
 883
 884 static dbus_bool_t
 885 expire_incomplete_timeout (void *data)
 886 {
 887   BusConnections *connections = data;
 888
 889   _dbus_verbose ("Running\n");
 890
 891   /* note that this may remove the timeout */
 892   bus_connections_expire_incomplete (connections);
 893
 894   return TRUE;
 895 }
 896
 897 dbus_bool_t
 898 bus_connection_get_unix_groups  (DBusConnection   *connection,
 899                                  unsigned long   **groups,
 900                                  int              *n_groups,
 901                                  DBusError        *error)
 902 {
 903   unsigned long uid;
 904
 905   *groups = NULL;
 906   *n_groups = 0;
 907
 908   if (dbus_connection_get_unix_user (connection, &uid))
 909     {
 910       if (!_dbus_unix_groups_from_uid (uid, groups, n_groups))
 911         {
 912           _dbus_verbose ("Did not get any groups for UID %lu\n",
 913                          uid);
 914           return FALSE;
 915         }
 916       else
 917         {
 918           _dbus_verbose ("Got %d groups for UID %lu\n",
 919                          *n_groups, uid);
 920           return TRUE;
 921         }
 922     }
 923   else
 924     return TRUE; /* successfully got 0 groups */
 925 }
 926
 927 dbus_bool_t
 928 bus_connection_is_in_unix_group (DBusConnection *connection,
 929                                  unsigned long   gid)
 930 {
 931   int i;
 932   unsigned long *group_ids;
 933   int n_group_ids;
 934
 935   if (!bus_connection_get_unix_groups (connection, &group_ids, &n_group_ids,
 936                                        NULL))
 937     return FALSE;
 938
 939   i = 0;
 940   while (i < n_group_ids)
 941     {
 942       if (group_ids[i] == gid)
 943         {
 944           dbus_free (group_ids);
 945           return TRUE;
 946         }
 947       ++i;
 948     }
 949
 950   dbus_free (group_ids);
 951   return FALSE;
 952 }
 953
 954 const char *
 955 bus_connection_get_loginfo (DBusConnection        *connection)
 956 {
 957   BusConnectionData *d;
 958
 959   d = BUS_CONNECTION_DATA (connection);
 960
 961   if (!bus_connection_is_active (connection))
 962     return "inactive";
 963   return d->cached_loginfo_string;
 964 }
 965
 966 BusClientPolicy*
 967 bus_connection_get_policy (DBusConnection *connection)
 968 {
 969   BusConnectionData *d;
 970
 971   d = BUS_CONNECTION_DATA (connection);
 972
 973   _dbus_assert (d != NULL);
 974   _dbus_assert (d->policy != NULL);
 975
 976   return d->policy;
 977 }
 978
 979 static dbus_bool_t
 980 foreach_active (BusConnections               *connections,
 981                 BusConnectionForeachFunction  function,
 982                 void                         *data)
 983 {
 984   DBusList *link;
 985
 986   link = _dbus_list_get_first_link (&connections->completed);
 987   while (link != NULL)
 988     {
 989       DBusConnection *connection = link->data;
 990       DBusList *next = _dbus_list_get_next_link (&connections->completed, link);
 991
 992       if (!(* function) (connection, data))
 993         return FALSE;
 994
 995       link = next;
 996     }
 997
 998   return TRUE;
 999 }
1000
1001 static dbus_bool_t
1002 foreach_inactive (BusConnections               *connections,
1003                   BusConnectionForeachFunction  function,
1004                   void                         *data)
1005 {
1006   DBusList *link;
1007
1008   link = _dbus_list_get_first_link (&connections->incomplete);
1009   while (link != NULL)
1010     {
1011       DBusConnection *connection = link->data;
1012       DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
1013
1014       if (!(* function) (connection, data))
1015         return FALSE;
1016
1017       link = next;
1018     }
1019
1020   return TRUE;
1021 }
1022
1023 /**
1024  * Calls function on each active connection; if the function returns
1025  * #FALSE, stops iterating. Active connections are authenticated
1026  * and have sent a Hello message.
1027  *
1028  * @param connections the connections object
1029  * @param function the function
1030  * @param data data to pass to it as a second arg
1031  */
1032 void
1033 bus_connections_foreach_active (BusConnections               *connections,
1034                                 BusConnectionForeachFunction  function,
1035                                 void                         *data)
1036 {
1037   foreach_active (connections, function, data);
1038 }
1039
1040 /**
1041  * Calls function on each connection; if the function returns
1042  * #FALSE, stops iterating.
1043  *
1044  * @param connections the connections object
1045  * @param function the function
1046  * @param data data to pass to it as a second arg
1047  */
1048 void
1049 bus_connections_foreach (BusConnections               *connections,
1050                          BusConnectionForeachFunction  function,
1051                          void                         *data)
1052 {
1053   if (!foreach_active (connections, function, data))
1054     return;
1055
1056   foreach_inactive (connections, function, data);
1057 }
1058
1059 BusContext*
1060 bus_connections_get_context (BusConnections *connections)
1061 {
1062   return connections->context;
1063 }
1064
1065 /*
1066  * This is used to avoid covering the same connection twice when
1067  * traversing connections. Note that it assumes we will
1068  * bus_connection_mark_stamp() each connection at least once per
1069  * INT_MAX increments of the global stamp, or wraparound would break
1070  * things.
1071  */
1072 void
1073 bus_connections_increment_stamp (BusConnections *connections)
1074 {
1075   connections->stamp += 1;
1076 }
1077
1078 /* Mark connection with current stamp, return TRUE if it
1079  * didn't already have that stamp
1080  */
1081 dbus_bool_t
1082 bus_connection_mark_stamp (DBusConnection *connection)
1083 {
1084   BusConnectionData *d;
1085
1086   d = BUS_CONNECTION_DATA (connection);
1087
1088   _dbus_assert (d != NULL);
1089
1090   if (d->stamp == d->connections->stamp)
1091     return FALSE;
1092   else
1093     {
1094       d->stamp = d->connections->stamp;
1095       return TRUE;
1096     }
1097 }
1098
1099 BusContext*
1100 bus_connection_get_context (DBusConnection *connection)
1101 {
1102   BusConnectionData *d;
1103
1104   d = BUS_CONNECTION_DATA (connection);
1105
1106   _dbus_assert (d != NULL);
1107
1108   return d->connections->context;
1109 }
1110
1111 BusConnections*
1112 bus_connection_get_connections (DBusConnection *connection)
1113 {
1114   BusConnectionData *d;
1115
1116   d = BUS_CONNECTION_DATA (connection);
1117
1118   _dbus_assert (d != NULL);
1119
1120   return d->connections;
1121 }
1122
1123 BusRegistry*
1124 bus_connection_get_registry (DBusConnection *connection)
1125 {
1126   BusConnectionData *d;
1127
1128   d = BUS_CONNECTION_DATA (connection);
1129
1130   _dbus_assert (d != NULL);
1131
1132   return bus_context_get_registry (d->connections->context);
1133 }
1134
1135 BusActivation*
1136 bus_connection_get_activation (DBusConnection *connection)
1137 {
1138   BusConnectionData *d;
1139
1140   d = BUS_CONNECTION_DATA (connection);
1141
1142   _dbus_assert (d != NULL);
1143
1144   return bus_context_get_activation (d->connections->context);
1145 }
1146
1147 BusMatchmaker*
1148 bus_connection_get_matchmaker (DBusConnection *connection)
1149 {
1150   BusConnectionData *d;
1151
1152   d = BUS_CONNECTION_DATA (connection);
1153
1154   _dbus_assert (d != NULL);
1155
1156   return bus_context_get_matchmaker (d->connections->context);
1157 }
1158
1159 BusSELinuxID*
1160 bus_connection_get_selinux_id (DBusConnection *connection)
1161 {
1162   BusConnectionData *d;
1163
1164   d = BUS_CONNECTION_DATA (connection);
1165
1166   _dbus_assert (d != NULL);
1167
1168   return d->selinux_id;
1169 }
1170
1171 /**
1172  * Checks whether the connection is registered with the message bus.
1173  *
1174  * @param connection the connection
1175  * @returns #TRUE if we're an active message bus participant
1176  */
1177 dbus_bool_t
1178 bus_connection_is_active (DBusConnection *connection)
1179 {
1180   BusConnectionData *d;
1181
1182   d = BUS_CONNECTION_DATA (connection);
1183
1184   return d != NULL && d->name != NULL;
1185 }
1186
1187 dbus_bool_t
1188 bus_connection_preallocate_oom_error (DBusConnection *connection)
1189 {
1190   DBusMessage *message;
1191   DBusPreallocatedSend *preallocated;
1192   BusConnectionData *d;
1193
1194   d = BUS_CONNECTION_DATA (connection);
1195
1196   _dbus_assert (d != NULL);
1197
1198   if (d->oom_preallocated != NULL)
1199     return TRUE;
1200
1201   preallocated = dbus_connection_preallocate_send (connection);
1202   if (preallocated == NULL)
1203     return FALSE;
1204
1205   message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1206
1207   if (message == NULL)
1208     {
1209       dbus_connection_free_preallocated_send (connection, preallocated);
1210       return FALSE;
1211     }
1212
1213   /* d->name may be NULL, but that is OK */
1214   if (!dbus_message_set_error_name (message, DBUS_ERROR_NO_MEMORY) ||
1215       !dbus_message_set_destination (message, d->name) ||
1216       !dbus_message_set_sender (message,
1217                                 DBUS_SERVICE_DBUS))
1218     {
1219       dbus_connection_free_preallocated_send (connection, preallocated);
1220       dbus_message_unref (message);
1221       return FALSE;
1222     }
1223
1224   /* set reply serial to placeholder value just so space is already allocated
1225    * for it.
1226    */
1227   if (!dbus_message_set_reply_serial (message, 14))
1228     {
1229       dbus_connection_free_preallocated_send (connection, preallocated);
1230       dbus_message_unref (message);
1231       return FALSE;
1232     }
1233
1234   d->oom_message = message;
1235   d->oom_preallocated = preallocated;
1236
1237   return TRUE;
1238 }
1239
1240 void
1241 bus_connection_send_oom_error (DBusConnection *connection,
1242                                DBusMessage    *in_reply_to)
1243 {
1244   BusConnectionData *d;
1245
1246   d = BUS_CONNECTION_DATA (connection);
1247
1248   _dbus_assert (d != NULL);
1249   _dbus_assert (d->oom_message != NULL);
1250
1251   /* should always succeed since we set it to a placeholder earlier */
1252   if (!dbus_message_set_reply_serial (d->oom_message,
1253                                       dbus_message_get_serial (in_reply_to)))
1254     _dbus_assert_not_reached ("Failed to set reply serial for preallocated oom message");
1255
1256   _dbus_assert (dbus_message_get_sender (d->oom_message) != NULL);
1257
1258   dbus_connection_send_preallocated (connection, d->oom_preallocated,
1259                                      d->oom_message, NULL);
1260
1261   dbus_message_unref (d->oom_message);
1262   d->oom_message = NULL;
1263   d->oom_preallocated = NULL;
1264 }
1265
1266 #ifdef DBUS_ENABLE_STATS
1267 static void
1268 update_peak (int *peak,
1269              int n)
1270 {
1271   if (*peak < n)
1272     *peak = n;
1273 }
1274 #endif
1275
1276 void
1277 bus_connection_add_match_rule_link (DBusConnection *connection,
1278                                     DBusList       *link)
1279 {
1280   BusConnectionData *d;
1281
1282   d = BUS_CONNECTION_DATA (connection);
1283   _dbus_assert (d != NULL);
1284
1285   _dbus_list_append_link (&d->match_rules, link);
1286
1287   d->n_match_rules += 1;
1288
1289 #ifdef DBUS_ENABLE_STATS
1290   update_peak (&d->peak_match_rules, d->n_match_rules);
1291   update_peak (&d->connections->peak_match_rules_per_conn, d->n_match_rules);
1292
1293   d->connections->total_match_rules += 1;
1294   update_peak (&d->connections->peak_match_rules,
1295                d->connections->total_match_rules);
1296 #endif
1297 }
1298
1299 dbus_bool_t
1300 bus_connection_add_match_rule (DBusConnection *connection,
1301                                BusMatchRule   *rule)
1302 {
1303     DBusList *link;
1304
1305   link = _dbus_list_alloc_link (rule);
1306
1307   if (link == NULL)
1308     return FALSE;
1309
1310   bus_connection_add_match_rule_link (connection, link);
1311
1312   return TRUE;
1313 }
1314
1315 void
1316 bus_connection_remove_match_rule (DBusConnection *connection,
1317                                   BusMatchRule   *rule)
1318 {
1319   BusConnectionData *d;
1320
1321   d = BUS_CONNECTION_DATA (connection);
1322   _dbus_assert (d != NULL);
1323
1324   _dbus_list_remove_last (&d->match_rules, rule);
1325
1326   d->n_match_rules -= 1;
1327   _dbus_assert (d->n_match_rules >= 0);
1328
1329 #ifdef DBUS_ENABLE_STATS
1330   d->connections->total_match_rules -= 1;
1331 #endif
1332 }
1333
1334 int
1335 bus_connection_get_n_match_rules (DBusConnection *connection)
1336 {
1337   BusConnectionData *d;
1338
1339   d = BUS_CONNECTION_DATA (connection);
1340   _dbus_assert (d != NULL);
1341
1342   return d->n_match_rules;
1343 }
1344
1345 void
1346 bus_connection_add_owned_service_link (DBusConnection *connection,
1347                                        DBusList       *link)
1348 {
1349   BusConnectionData *d;
1350
1351   d = BUS_CONNECTION_DATA (connection);
1352   _dbus_assert (d != NULL);
1353
1354   _dbus_list_append_link (&d->services_owned, link);
1355
1356   d->n_services_owned += 1;
1357
1358 #ifdef DBUS_ENABLE_STATS
1359   update_peak (&d->peak_bus_names, d->n_services_owned);
1360   update_peak (&d->connections->peak_bus_names_per_conn,
1361                d->n_services_owned);
1362
1363   d->connections->total_bus_names += 1;
1364   update_peak (&d->connections->peak_bus_names,
1365                d->connections->total_bus_names);
1366 #endif
1367 }
1368
1369 dbus_bool_t
1370 bus_connection_add_owned_service (DBusConnection *connection,
1371                                   BusService     *service)
1372 {
1373   DBusList *link;
1374
1375   link = _dbus_list_alloc_link (service);
1376
1377   if (link == NULL)
1378     return FALSE;
1379
1380   bus_connection_add_owned_service_link (connection, link);
1381
1382   return TRUE;
1383 }
1384
1385 void
1386 bus_connection_remove_owned_service (DBusConnection *connection,
1387                                      BusService     *service)
1388 {
1389   BusConnectionData *d;
1390
1391   d = BUS_CONNECTION_DATA (connection);
1392   _dbus_assert (d != NULL);
1393
1394   _dbus_list_remove_last (&d->services_owned, service);
1395
1396   d->n_services_owned -= 1;
1397   _dbus_assert (d->n_services_owned >= 0);
1398
1399 #ifdef DBUS_ENABLE_STATS
1400   d->connections->total_bus_names -= 1;
1401 #endif
1402 }
1403
1404 int
1405 bus_connection_get_n_services_owned (DBusConnection *connection)
1406 {
1407   BusConnectionData *d;
1408
1409   d = BUS_CONNECTION_DATA (connection);
1410   _dbus_assert (d != NULL);
1411
1412   return d->n_services_owned;
1413 }
1414
1415 dbus_bool_t
1416 bus_connection_complete (DBusConnection   *connection,
1417                          const DBusString *name,
1418                          DBusError        *error)
1419 {
1420   BusConnectionData *d;
1421   unsigned long uid;
1422
1423   d = BUS_CONNECTION_DATA (connection);
1424   _dbus_assert (d != NULL);
1425   _dbus_assert (d->name == NULL);
1426   _dbus_assert (d->policy == NULL);
1427
1428   _dbus_assert (!bus_connection_is_active (connection));
1429
1430   if (!_dbus_string_copy_data (name, &d->name))
1431     {
1432       BUS_SET_OOM (error);
1433       return FALSE;
1434     }
1435
1436   _dbus_assert (d->name != NULL);
1437
1438   _dbus_verbose ("Name %s assigned to %p\n", d->name, connection);
1439
1440   d->policy = bus_context_create_client_policy (d->connections->context,
1441                                                 connection,
1442                                                 error);
1443
1444   /* we may have a NULL policy on OOM or error getting list of
1445    * groups for a user. In the latter case we don't handle it so
1446    * well currently, as it will just keep failing over and over.
1447    */
1448
1449   if (d->policy == NULL)
1450     {
1451       _dbus_verbose ("Failed to create security policy for connection %p\n",
1452                      connection);
1453       _DBUS_ASSERT_ERROR_IS_SET (error);
1454       dbus_free (d->name);
1455       d->name = NULL;
1456       return FALSE;
1457     }
1458
1459   if (dbus_connection_get_unix_user (connection, &uid))
1460     {
1461       if (!adjust_connections_for_uid (d->connections,
1462                                        uid, 1))
1463         goto fail;
1464     }
1465
1466   /* Create and cache a string which holds information about the
1467    * peer process; used for logging purposes.
1468    */
1469   if (!cache_peer_loginfo_string (d, connection))
1470     goto fail;
1471
1472   /* Now the connection is active, move it between lists */
1473   _dbus_list_unlink (&d->connections->incomplete,
1474                      d->link_in_connection_list);
1475   d->connections->n_incomplete -= 1;
1476   _dbus_list_append_link (&d->connections->completed,
1477                           d->link_in_connection_list);
1478   d->connections->n_completed += 1;
1479
1480   _dbus_assert (d->connections->n_incomplete >= 0);
1481   _dbus_assert (d->connections->n_completed > 0);
1482
1483   /* If we have dropped below the max. number of incomplete
1484    * connections, start accept()ing again */
1485   bus_context_check_all_watches (d->connections->context);
1486
1487   /* See if we can remove the timeout */
1488   bus_connections_expire_incomplete (d->connections);
1489
1490   _dbus_assert (bus_connection_is_active (connection));
1491
1492   return TRUE;
1493 fail:
1494   BUS_SET_OOM (error);
1495   dbus_free (d->name);
1496   d->name = NULL;
1497   if (d->policy)
1498     bus_client_policy_unref (d->policy);
1499   d->policy = NULL;
1500   return FALSE;
1501 }
1502
1503 dbus_bool_t
1504 bus_connections_reload_policy (BusConnections *connections,
1505                                DBusError      *error)
1506 {
1507   BusConnectionData *d;
1508   DBusConnection *connection;
1509   DBusList *link;
1510
1511   _dbus_assert (connections != NULL);
1512   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1513
1514   for (link = _dbus_list_get_first_link (&(connections->completed));
1515        link;
1516        link = _dbus_list_get_next_link (&(connections->completed), link))
1517     {
1518       connection = link->data;
1519       d = BUS_CONNECTION_DATA (connection);
1520       _dbus_assert (d != NULL);
1521       _dbus_assert (d->policy != NULL);
1522
1523       bus_client_policy_unref (d->policy);
1524       d->policy = bus_context_create_client_policy (connections->context,
1525                                                     connection,
1526                                                     error);
1527       if (d->policy == NULL)
1528         {
1529           _dbus_verbose ("Failed to create security policy for connection %p\n",
1530                       connection);
1531           _DBUS_ASSERT_ERROR_IS_SET (error);
1532           return FALSE;
1533         }
1534     }
1535
1536   return TRUE;
1537 }
1538
1539 const char *
1540 bus_connection_get_name (DBusConnection *connection)
1541 {
1542   BusConnectionData *d;
1543
1544   d = BUS_CONNECTION_DATA (connection);
1545   _dbus_assert (d != NULL);
1546
1547   return d->name;
1548 }
1549
1550 /**
1551  * Check whether completing the passed-in connection would
1552  * exceed limits, and if so set error and return #FALSE
1553  */
1554 dbus_bool_t
1555 bus_connections_check_limits (BusConnections  *connections,
1556                               DBusConnection  *requesting_completion,
1557                               DBusError       *error)
1558 {
1559   unsigned long uid;
1560
1561   if (connections->n_completed >=
1562       bus_context_get_max_completed_connections (connections->context))
1563     {
1564       dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1565                       "The maximum number of active connections has been reached");
1566       return FALSE;
1567     }
1568
1569   if (dbus_connection_get_unix_user (requesting_completion, &uid))
1570     {
1571       if (get_connections_for_uid (connections, uid) >=
1572           bus_context_get_max_connections_per_user (connections->context))
1573         {
1574           dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1575                           "The maximum number of active connections for UID %lu has been reached",
1576                           uid);
1577           return FALSE;
1578         }
1579     }
1580
1581   return TRUE;
1582 }
1583
1584 static void
1585 bus_pending_reply_free (BusPendingReply *pending)
1586 {
1587   _dbus_verbose ("Freeing 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   dbus_free (pending);
1594 }
1595
1596 static dbus_bool_t
1597 bus_pending_reply_send_no_reply (BusConnections  *connections,
1598                                  BusTransaction  *transaction,
1599                                  BusPendingReply *pending)
1600 {
1601   DBusMessage *message;
1602   DBusMessageIter iter;
1603   dbus_bool_t retval;
1604   const char *errmsg;
1605
1606   retval = FALSE;
1607
1608   message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1609   if (message == NULL)
1610     return FALSE;
1611
1612   dbus_message_set_no_reply (message, TRUE);
1613
1614   if (!dbus_message_set_reply_serial (message,
1615                                       pending->reply_serial))
1616     goto out;
1617
1618   if (!dbus_message_set_error_name (message,
1619                                     DBUS_ERROR_NO_REPLY))
1620     goto out;
1621
1622   /* If you change these messages, adjust test/dbus-daemon.c to match */
1623   if (pending->will_send_reply == NULL)
1624     errmsg = "Message recipient disconnected from message bus without replying";
1625   else
1626     errmsg = "Message did not receive a reply (timeout by message bus)";
1627
1628   dbus_message_iter_init_append (message, &iter);
1629   if (!dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &errmsg))
1630     goto out;
1631
1632   if (!bus_transaction_send_from_driver (transaction, pending->will_get_reply,
1633                                          message))
1634     goto out;
1635
1636   retval = TRUE;
1637
1638  out:
1639   dbus_message_unref (message);
1640   return retval;
1641 }
1642
1643 static dbus_bool_t
1644 bus_pending_reply_expired (BusExpireList *list,
1645                            DBusList      *link,
1646                            void          *data)
1647 {
1648   BusPendingReply *pending = link->data;
1649   BusConnections *connections = data;
1650   BusTransaction *transaction;
1651
1652   /* No reply is forthcoming. So nuke it if we can. If not,
1653    * leave it in the list to try expiring again later when we
1654    * get more memory.
1655    */
1656
1657   _dbus_verbose ("Expiring pending reply %p, replier %p receiver %p serial %u\n",
1658                  pending,
1659                  pending->will_send_reply,
1660                  pending->will_get_reply,
1661                  pending->reply_serial);
1662
1663   transaction = bus_transaction_new (connections->context);
1664   if (transaction == NULL)
1665     return FALSE;
1666
1667   if (!bus_pending_reply_send_no_reply (connections,
1668                                         transaction,
1669                                         pending))
1670     {
1671       bus_transaction_cancel_and_free (transaction);
1672       return FALSE;
1673     }
1674
1675   bus_expire_list_remove_link (connections->pending_replies, link);
1676
1677   bus_pending_reply_free (pending);
1678   bus_transaction_execute_and_free (transaction);
1679
1680   return TRUE;
1681 }
1682
1683 static void
1684 bus_connection_drop_pending_replies (BusConnections  *connections,
1685                                      DBusConnection  *connection)
1686 {
1687   /* The DBusConnection is almost 100% finalized here, so you can't
1688    * do anything with it except check for pointer equality
1689    */
1690   DBusList *link;
1691
1692   _dbus_verbose ("Dropping pending replies that involve connection %p\n",
1693                  connection);
1694
1695   link = bus_expire_list_get_first_link (connections->pending_replies);
1696   while (link != NULL)
1697     {
1698       DBusList *next;
1699       BusPendingReply *pending;
1700
1701       next = bus_expire_list_get_next_link (connections->pending_replies,
1702                                             link);
1703       pending = link->data;
1704
1705       if (pending->will_get_reply == connection)
1706         {
1707           /* We don't need to track this pending reply anymore */
1708
1709           _dbus_verbose ("Dropping pending reply %p, replier %p receiver %p serial %u\n",
1710                          pending,
1711                          pending->will_send_reply,
1712                          pending->will_get_reply,
1713                          pending->reply_serial);
1714
1715           bus_expire_list_remove_link (connections->pending_replies,
1716                                        link);
1717           bus_pending_reply_free (pending);
1718         }
1719       else if (pending->will_send_reply == connection)
1720         {
1721           /* The reply isn't going to be sent, so set things
1722            * up so it will be expired right away
1723            */
1724           _dbus_verbose ("Will expire pending reply %p, replier %p receiver %p serial %u\n",
1725                          pending,
1726                          pending->will_send_reply,
1727                          pending->will_get_reply,
1728                          pending->reply_serial);
1729
1730           pending->will_send_reply = NULL;
1731           pending->expire_item.added_tv_sec = 0;
1732           pending->expire_item.added_tv_usec = 0;
1733
1734           bus_expire_list_recheck_immediately (connections->pending_replies);
1735         }
1736
1737       link = next;
1738     }
1739 }
1740
1741
1742 typedef struct
1743 {
1744   BusPendingReply *pending;
1745   BusConnections  *connections;
1746 } CancelPendingReplyData;
1747
1748 static void
1749 cancel_pending_reply (void *data)
1750 {
1751   CancelPendingReplyData *d = data;
1752
1753   _dbus_verbose ("d = %p\n", d);
1754
1755   if (!bus_expire_list_remove (d->connections->pending_replies,
1756                                &d->pending->expire_item))
1757     _dbus_assert_not_reached ("pending reply did not exist to be cancelled");
1758
1759   bus_pending_reply_free (d->pending); /* since it's been cancelled */
1760 }
1761
1762 static void
1763 cancel_pending_reply_data_free (void *data)
1764 {
1765   CancelPendingReplyData *d = data;
1766
1767   _dbus_verbose ("d = %p\n", d);
1768
1769   /* d->pending should be either freed or still
1770    * in the list of pending replies (owned by someone
1771    * else)
1772    */
1773
1774   dbus_free (d);
1775 }
1776
1777 /*
1778  * Record that a reply is allowed; return TRUE on success.
1779  */
1780 dbus_bool_t
1781 bus_connections_expect_reply (BusConnections  *connections,
1782                               BusTransaction  *transaction,
1783                               DBusConnection  *will_get_reply,
1784                               DBusConnection  *will_send_reply,
1785                               DBusMessage     *reply_to_this,
1786                               DBusError       *error)
1787 {
1788   BusPendingReply *pending;
1789   dbus_uint32_t reply_serial;
1790   DBusList *link;
1791   CancelPendingReplyData *cprd;
1792   int count;
1793
1794   _dbus_assert (will_get_reply != NULL);
1795   _dbus_assert (will_send_reply != NULL);
1796   _dbus_assert (reply_to_this != NULL);
1797
1798   if (dbus_message_get_no_reply (reply_to_this))
1799     return TRUE; /* we won't allow a reply, since client doesn't care for one. */
1800
1801   reply_serial = dbus_message_get_serial (reply_to_this);
1802
1803   link = bus_expire_list_get_first_link (connections->pending_replies);
1804   count = 0;
1805   while (link != NULL)
1806     {
1807       pending = link->data;
1808
1809       if (pending->reply_serial == reply_serial &&
1810           pending->will_get_reply == will_get_reply &&
1811           pending->will_send_reply == will_send_reply)
1812         {
1813           dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1814                           "Message has the same reply serial as a currently-outstanding existing method call");
1815           return FALSE;
1816         }
1817
1818       link = bus_expire_list_get_next_link (connections->pending_replies,
1819                                             link);
1820       if (pending->will_get_reply == will_get_reply)
1821         ++count;
1822     }
1823
1824   if (count >=
1825       bus_context_get_max_replies_per_connection (connections->context))
1826     {
1827       dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1828                       "The maximum number of pending replies per connection has been reached");
1829       return FALSE;
1830     }
1831
1832   pending = dbus_new0 (BusPendingReply, 1);
1833   if (pending == NULL)
1834     {
1835       BUS_SET_OOM (error);
1836       return FALSE;
1837     }
1838
1839 #ifdef DBUS_ENABLE_VERBOSE_MODE
1840   /* so we can see a not-yet-added pending reply */
1841   pending->expire_item.added_tv_sec = 1;
1842   pending->expire_item.added_tv_usec = 1;
1843 #endif
1844
1845   pending->will_get_reply = will_get_reply;
1846   pending->will_send_reply = will_send_reply;
1847   pending->reply_serial = reply_serial;
1848
1849   cprd = dbus_new0 (CancelPendingReplyData, 1);
1850   if (cprd == NULL)
1851     {
1852       BUS_SET_OOM (error);
1853       bus_pending_reply_free (pending);
1854       return FALSE;
1855     }
1856
1857   if (!bus_expire_list_add (connections->pending_replies,
1858                             &pending->expire_item))
1859     {
1860       BUS_SET_OOM (error);
1861       dbus_free (cprd);
1862       bus_pending_reply_free (pending);
1863       return FALSE;
1864     }
1865
1866   if (!bus_transaction_add_cancel_hook (transaction,
1867                                         cancel_pending_reply,
1868                                         cprd,
1869                                         cancel_pending_reply_data_free))
1870     {
1871       BUS_SET_OOM (error);
1872       bus_expire_list_remove (connections->pending_replies, &pending->expire_item);
1873       dbus_free (cprd);
1874       bus_pending_reply_free (pending);
1875       return FALSE;
1876     }
1877
1878   cprd->pending = pending;
1879   cprd->connections = connections;
1880
1881   _dbus_get_monotonic_time (&pending->expire_item.added_tv_sec,
1882                             &pending->expire_item.added_tv_usec);
1883
1884   _dbus_verbose ("Added pending reply %p, replier %p receiver %p serial %u\n",
1885                  pending,
1886                  pending->will_send_reply,
1887                  pending->will_get_reply,
1888                  pending->reply_serial);
1889
1890   return TRUE;
1891 }
1892
1893 typedef struct
1894 {
1895   DBusList        *link;
1896   BusConnections  *connections;
1897 } CheckPendingReplyData;
1898
1899 static void
1900 cancel_check_pending_reply (void *data)
1901 {
1902   CheckPendingReplyData *d = data;
1903
1904   _dbus_verbose ("d = %p\n",d);
1905
1906   bus_expire_list_add_link (d->connections->pending_replies,
1907                             d->link);
1908   d->link = NULL;
1909 }
1910
1911 static void
1912 check_pending_reply_data_free (void *data)
1913 {
1914   CheckPendingReplyData *d = data;
1915
1916   _dbus_verbose ("d = %p\n",d);
1917
1918   if (d->link != NULL)
1919     {
1920       BusPendingReply *pending = d->link->data;
1921
1922       _dbus_assert (!bus_expire_list_contains_item (d->connections->pending_replies,
1923                                                     &pending->expire_item));
1924
1925       bus_pending_reply_free (pending);
1926       _dbus_list_free_link (d->link);
1927     }
1928
1929   dbus_free (d);
1930 }
1931
1932 /*
1933  * Check whether a reply is allowed, remove BusPendingReply
1934  * if so, return TRUE if so.
1935  */
1936 dbus_bool_t
1937 bus_connections_check_reply (BusConnections *connections,
1938                              BusTransaction *transaction,
1939                              DBusConnection *sending_reply,
1940                              DBusConnection *receiving_reply,
1941                              DBusMessage    *reply,
1942                              DBusError      *error)
1943 {
1944   CheckPendingReplyData *cprd;
1945   DBusList *link;
1946   dbus_uint32_t reply_serial;
1947
1948   _dbus_assert (sending_reply != NULL);
1949   _dbus_assert (receiving_reply != NULL);
1950
1951   reply_serial = dbus_message_get_reply_serial (reply);
1952
1953   link = bus_expire_list_get_first_link (connections->pending_replies);
1954   while (link != NULL)
1955     {
1956       BusPendingReply *pending = link->data;
1957
1958       if (pending->reply_serial == reply_serial &&
1959           pending->will_get_reply == receiving_reply &&
1960           pending->will_send_reply == sending_reply)
1961         {
1962           _dbus_verbose ("Found pending reply with serial %u\n", reply_serial);
1963           break;
1964         }
1965
1966       link = bus_expire_list_get_next_link (connections->pending_replies,
1967                                             link);
1968     }
1969
1970   if (link == NULL)
1971     {
1972       _dbus_verbose ("No pending reply expected\n");
1973
1974       return FALSE;
1975     }
1976
1977   cprd = dbus_new0 (CheckPendingReplyData, 1);
1978   if (cprd == NULL)
1979     {
1980       BUS_SET_OOM (error);
1981       return FALSE;
1982     }
1983
1984   if (!bus_transaction_add_cancel_hook (transaction,
1985                                         cancel_check_pending_reply,
1986                                         cprd,
1987                                         check_pending_reply_data_free))
1988     {
1989       BUS_SET_OOM (error);
1990       dbus_free (cprd);
1991       return FALSE;
1992     }
1993
1994   cprd->link = link;
1995   cprd->connections = connections;
1996
1997   bus_expire_list_unlink (connections->pending_replies,
1998                           link);
1999
2000   _dbus_assert (!bus_expire_list_contains_item (connections->pending_replies, link->data));
2001
2002   return TRUE;
2003 }
2004
2005 /*
2006  * Transactions
2007  *
2008  * Note that this is fairly fragile; in particular, don't try to use
2009  * one transaction across any main loop iterations.
2010  */
2011
2012 typedef struct
2013 {
2014   BusTransaction *transaction;
2015   DBusMessage    *message;
2016   DBusPreallocatedSend *preallocated;
2017 } MessageToSend;
2018
2019 typedef struct
2020 {
2021   BusTransactionCancelFunction cancel_function;
2022   DBusFreeFunction free_data_function;
2023   void *data;
2024 } CancelHook;
2025
2026 struct BusTransaction
2027 {
2028   DBusList *connections;
2029   BusContext *context;
2030   DBusList *cancel_hooks;
2031 };
2032
2033 static void
2034 message_to_send_free (DBusConnection *connection,
2035                       MessageToSend  *to_send)
2036 {
2037   if (to_send->message)
2038     dbus_message_unref (to_send->message);
2039
2040   if (to_send->preallocated)
2041     dbus_connection_free_preallocated_send (connection, to_send->preallocated);
2042
2043   dbus_free (to_send);
2044 }
2045
2046 static void
2047 cancel_hook_cancel (void *element,
2048                     void *data)
2049 {
2050   CancelHook *ch = element;
2051
2052   _dbus_verbose ("Running transaction cancel hook\n");
2053
2054   if (ch->cancel_function)
2055     (* ch->cancel_function) (ch->data);
2056 }
2057
2058 static void
2059 cancel_hook_free (void *element,
2060                   void *data)
2061 {
2062   CancelHook *ch = element;
2063
2064   if (ch->free_data_function)
2065     (* ch->free_data_function) (ch->data);
2066
2067   dbus_free (ch);
2068 }
2069
2070 static void
2071 free_cancel_hooks (BusTransaction *transaction)
2072 {
2073   _dbus_list_foreach (&transaction->cancel_hooks,
2074                       cancel_hook_free, NULL);
2075
2076   _dbus_list_clear (&transaction->cancel_hooks);
2077 }
2078
2079 BusTransaction*
2080 bus_transaction_new (BusContext *context)
2081 {
2082   BusTransaction *transaction;
2083
2084   transaction = dbus_new0 (BusTransaction, 1);
2085   if (transaction == NULL)
2086     return NULL;
2087
2088   transaction->context = context;
2089
2090   return transaction;
2091 }
2092
2093 BusContext*
2094 bus_transaction_get_context (BusTransaction  *transaction)
2095 {
2096   return transaction->context;
2097 }
2098
2099 dbus_bool_t
2100 bus_transaction_send_from_driver (BusTransaction *transaction,
2101                                   DBusConnection *connection,
2102                                   DBusMessage    *message)
2103 {
2104   /* We have to set the sender to the driver, and have
2105    * to check security policy since it was not done in
2106    * dispatch.c
2107    */
2108   _dbus_verbose ("Sending %s %s %s from driver\n",
2109                  dbus_message_get_interface (message) ?
2110                  dbus_message_get_interface (message) : "(no interface)",
2111                  dbus_message_get_member (message) ?
2112                  dbus_message_get_member (message) : "(no member)",
2113                  dbus_message_get_error_name (message) ?
2114                  dbus_message_get_error_name (message) : "(no error name)");
2115
2116   if (!dbus_message_set_sender (message, DBUS_SERVICE_DBUS))
2117     return FALSE;
2118
2119   if (bus_connection_is_active (connection))
2120     {
2121       if (!dbus_message_set_destination (message,
2122                                          bus_connection_get_name (connection)))
2123         return FALSE;
2124     }
2125
2126   /* bus driver never wants a reply */
2127   dbus_message_set_no_reply (message, TRUE);
2128
2129   /* If security policy doesn't allow the message, we silently
2130    * eat it; the driver doesn't care about getting a reply.
2131    */
2132   if (!bus_context_check_security_policy (bus_transaction_get_context (transaction),
2133                                           transaction,
2134                                           NULL, connection, connection, message, NULL))
2135     return TRUE;
2136
2137   return bus_transaction_send (transaction, connection, message);
2138 }
2139
2140 dbus_bool_t
2141 bus_transaction_send (BusTransaction *transaction,
2142                       DBusConnection *connection,
2143                       DBusMessage    *message)
2144 {
2145   MessageToSend *to_send;
2146   BusConnectionData *d;
2147   DBusList *link;
2148
2149   _dbus_verbose ("  trying to add %s interface=%s member=%s error=%s to transaction%s\n",
2150                  dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_ERROR ? "error" :
2151                  dbus_message_get_reply_serial (message) != 0 ? "reply" :
2152                  "message",
2153                  dbus_message_get_interface (message) ?
2154                  dbus_message_get_interface (message) : "(unset)",
2155                  dbus_message_get_member (message) ?
2156                  dbus_message_get_member (message) : "(unset)",
2157                  dbus_message_get_error_name (message) ?
2158                  dbus_message_get_error_name (message) : "(unset)",
2159                  dbus_connection_get_is_connected (connection) ?
2160                  "" : " (disconnected)");
2161
2162   _dbus_assert (dbus_message_get_sender (message) != NULL);
2163
2164   if (!dbus_connection_get_is_connected (connection))
2165     return TRUE; /* silently ignore disconnected connections */
2166
2167   d = BUS_CONNECTION_DATA (connection);
2168   _dbus_assert (d != NULL);
2169
2170   to_send = dbus_new (MessageToSend, 1);
2171   if (to_send == NULL)
2172     {
2173       return FALSE;
2174     }
2175
2176   to_send->preallocated = dbus_connection_preallocate_send (connection);
2177   if (to_send->preallocated == NULL)
2178     {
2179       dbus_free (to_send);
2180       return FALSE;
2181     }
2182
2183   dbus_message_ref (message);
2184   to_send->message = message;
2185   to_send->transaction = transaction;
2186
2187   _dbus_verbose ("about to prepend message\n");
2188
2189   if (!_dbus_list_prepend (&d->transaction_messages, to_send))
2190     {
2191       message_to_send_free (connection, to_send);
2192       return FALSE;
2193     }
2194
2195   _dbus_verbose ("prepended message\n");
2196
2197   /* See if we already had this connection in the list
2198    * for this transaction. If we have a pending message,
2199    * then we should already be in transaction->connections
2200    */
2201   link = _dbus_list_get_first_link (&d->transaction_messages);
2202   _dbus_assert (link->data == to_send);
2203   link = _dbus_list_get_next_link (&d->transaction_messages, link);
2204   while (link != NULL)
2205     {
2206       MessageToSend *m = link->data;
2207       DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2208
2209       if (m->transaction == transaction)
2210         break;
2211
2212       link = next;
2213     }
2214
2215   if (link == NULL)
2216     {
2217       if (!_dbus_list_prepend (&transaction->connections, connection))
2218         {
2219           _dbus_list_remove (&d->transaction_messages, to_send);
2220           message_to_send_free (connection, to_send);
2221           return FALSE;
2222         }
2223     }
2224
2225   return TRUE;
2226 }
2227
2228 static void
2229 transaction_free (BusTransaction *transaction)
2230 {
2231   _dbus_assert (transaction->connections == NULL);
2232
2233   free_cancel_hooks (transaction);
2234
2235   dbus_free (transaction);
2236 }
2237
2238 static void
2239 connection_cancel_transaction (DBusConnection *connection,
2240                                BusTransaction *transaction)
2241 {
2242   DBusList *link;
2243   BusConnectionData *d;
2244
2245   d = BUS_CONNECTION_DATA (connection);
2246   _dbus_assert (d != NULL);
2247
2248   link = _dbus_list_get_first_link (&d->transaction_messages);
2249   while (link != NULL)
2250     {
2251       MessageToSend *m = link->data;
2252       DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2253
2254       if (m->transaction == transaction)
2255         {
2256           _dbus_list_remove_link (&d->transaction_messages,
2257                                   link);
2258
2259           message_to_send_free (connection, m);
2260         }
2261
2262       link = next;
2263     }
2264 }
2265
2266 void
2267 bus_transaction_cancel_and_free (BusTransaction *transaction)
2268 {
2269   DBusConnection *connection;
2270
2271   _dbus_verbose ("TRANSACTION: cancelled\n");
2272
2273   while ((connection = _dbus_list_pop_first (&transaction->connections)))
2274     connection_cancel_transaction (connection, transaction);
2275
2276   _dbus_list_foreach (&transaction->cancel_hooks,
2277                       cancel_hook_cancel, NULL);
2278
2279   transaction_free (transaction);
2280 }
2281
2282 static void
2283 connection_execute_transaction (DBusConnection *connection,
2284                                 BusTransaction *transaction)
2285 {
2286   DBusList *link;
2287   BusConnectionData *d;
2288
2289   d = BUS_CONNECTION_DATA (connection);
2290   _dbus_assert (d != NULL);
2291
2292   /* Send the queue in order (FIFO) */
2293   link = _dbus_list_get_last_link (&d->transaction_messages);
2294   while (link != NULL)
2295     {
2296       MessageToSend *m = link->data;
2297       DBusList *prev = _dbus_list_get_prev_link (&d->transaction_messages, link);
2298
2299       if (m->transaction == transaction)
2300         {
2301           _dbus_list_remove_link (&d->transaction_messages,
2302                                   link);
2303
2304           _dbus_assert (dbus_message_get_sender (m->message) != NULL);
2305
2306           dbus_connection_send_preallocated (connection,
2307                                              m->preallocated,
2308                                              m->message,
2309                                              NULL);
2310
2311           m->preallocated = NULL; /* so we don't double-free it */
2312
2313           message_to_send_free (connection, m);
2314         }
2315
2316       link = prev;
2317     }
2318 }
2319
2320 void
2321 bus_transaction_execute_and_free (BusTransaction *transaction)
2322 {
2323   /* For each connection in transaction->connections
2324    * send the messages
2325    */
2326   DBusConnection *connection;
2327
2328   _dbus_verbose ("TRANSACTION: executing\n");
2329
2330   while ((connection = _dbus_list_pop_first (&transaction->connections)))
2331     connection_execute_transaction (connection, transaction);
2332
2333   transaction_free (transaction);
2334 }
2335
2336 static void
2337 bus_connection_remove_transactions (DBusConnection *connection)
2338 {
2339   MessageToSend *to_send;
2340   BusConnectionData *d;
2341
2342   d = BUS_CONNECTION_DATA (connection);
2343   _dbus_assert (d != NULL);
2344
2345   while ((to_send = _dbus_list_get_first (&d->transaction_messages)))
2346     {
2347       /* only has an effect for the first MessageToSend listing this transaction */
2348       _dbus_list_remove (&to_send->transaction->connections,
2349                          connection);
2350
2351       _dbus_list_remove (&d->transaction_messages, to_send);
2352       message_to_send_free (connection, to_send);
2353     }
2354 }
2355
2356 /**
2357  * Converts the DBusError to a message reply
2358  */
2359 dbus_bool_t
2360 bus_transaction_send_error_reply (BusTransaction  *transaction,
2361                                   DBusConnection  *connection,
2362                                   const DBusError *error,
2363                                   DBusMessage     *in_reply_to)
2364 {
2365   DBusMessage *reply;
2366
2367   _dbus_assert (error != NULL);
2368   _DBUS_ASSERT_ERROR_IS_SET (error);
2369
2370   _dbus_verbose ("Sending error reply %s \"%s\"\n",
2371                  error->name, error->message);
2372
2373   reply = dbus_message_new_error (in_reply_to,
2374                                   error->name,
2375                                   error->message);
2376   if (reply == NULL)
2377     return FALSE;
2378
2379   if (!bus_transaction_send_from_driver (transaction, connection, reply))
2380     {
2381       dbus_message_unref (reply);
2382       return FALSE;
2383     }
2384
2385   dbus_message_unref (reply);
2386
2387   return TRUE;
2388 }
2389
2390 dbus_bool_t
2391 bus_transaction_add_cancel_hook (BusTransaction               *transaction,
2392                                  BusTransactionCancelFunction  cancel_function,
2393                                  void                         *data,
2394                                  DBusFreeFunction              free_data_function)
2395 {
2396   CancelHook *ch;
2397
2398   ch = dbus_new (CancelHook, 1);
2399   if (ch == NULL)
2400     return FALSE;
2401
2402   _dbus_verbose ("     adding cancel hook function = %p data = %p\n",
2403                  cancel_function, data);
2404
2405   ch->cancel_function = cancel_function;
2406   ch->data = data;
2407   ch->free_data_function = free_data_function;
2408
2409   /* It's important that the hooks get run in reverse order that they
2410    * were added
2411    */
2412   if (!_dbus_list_prepend (&transaction->cancel_hooks, ch))
2413     {
2414       dbus_free (ch);
2415       return FALSE;
2416     }
2417
2418   return TRUE;
2419 }
2420
2421 int
2422 bus_connections_get_n_active (BusConnections *connections)
2423 {
2424   return connections->n_completed;
2425 }
2426
2427 int
2428 bus_connections_get_n_incomplete (BusConnections *connections)
2429 {
2430   return connections->n_incomplete;
2431 }
2432
2433 #ifdef DBUS_ENABLE_STATS
2434 int
2435 bus_connections_get_total_match_rules (BusConnections *connections)
2436 {
2437   return connections->total_match_rules;
2438 }
2439
2440 int
2441 bus_connections_get_peak_match_rules (BusConnections *connections)
2442 {
2443   return connections->peak_match_rules;
2444 }
2445
2446 int
2447 bus_connections_get_peak_match_rules_per_conn (BusConnections *connections)
2448 {
2449   return connections->peak_match_rules_per_conn;
2450 }
2451
2452 int
2453 bus_connections_get_total_bus_names (BusConnections *connections)
2454 {
2455   return connections->total_bus_names;
2456 }
2457
2458 int
2459 bus_connections_get_peak_bus_names (BusConnections *connections)
2460 {
2461   return connections->peak_bus_names;
2462 }
2463
2464 int
2465 bus_connections_get_peak_bus_names_per_conn (BusConnections *connections)
2466 {
2467   return connections->peak_bus_names_per_conn;
2468 }
2469
2470 int
2471 bus_connection_get_peak_match_rules (DBusConnection *connection)
2472 {
2473   BusConnectionData *d;
2474
2475   d = BUS_CONNECTION_DATA (connection);
2476   return d->peak_match_rules;
2477 }
2478
2479 int
2480 bus_connection_get_peak_bus_names (DBusConnection *connection)
2481 {
2482   BusConnectionData *d;
2483
2484   d = BUS_CONNECTION_DATA (connection);
2485   return d->peak_bus_names;
2486 }
2487 #endif /* DBUS_ENABLE_STATS */