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               /* Unfortunately, we can't identify the connection: it doesn't
 864                * have a unique name yet, we don't know its uid/pid yet,
 865                * and so on. */
 866               bus_context_log (connections->context, DBUS_SYSTEM_LOG_WARNING,
 867                   "Connection has not authenticated soon enough, closing it "
 868                   "(auth_timeout=%dms, elapsed: %.0fms)",
 869                   auth_timeout, elapsed);
 870
 871               _dbus_verbose ("Timing out authentication for connection %p\n", connection);
 872               dbus_connection_close (connection);
 873             }
 874           else
 875             {
 876               /* We can end the loop, since the connections are in oldest-first order */
 877               next_interval = ((double)auth_timeout) - elapsed;
 878               _dbus_verbose ("Connection %p authentication expires in %d milliseconds\n",
 879                              connection, next_interval);
 880
 881               break;
 882             }
 883
 884           link = next;
 885         }
 886     }
 887
 888   bus_expire_timeout_set_interval (connections->expire_timeout,
 889                                    next_interval);
 890 }
 891
 892 static dbus_bool_t
 893 expire_incomplete_timeout (void *data)
 894 {
 895   BusConnections *connections = data;
 896
 897   _dbus_verbose ("Running\n");
 898
 899   /* note that this may remove the timeout */
 900   bus_connections_expire_incomplete (connections);
 901
 902   return TRUE;
 903 }
 904
 905 dbus_bool_t
 906 bus_connection_get_unix_groups  (DBusConnection   *connection,
 907                                  unsigned long   **groups,
 908                                  int              *n_groups,
 909                                  DBusError        *error)
 910 {
 911   unsigned long uid;
 912
 913   *groups = NULL;
 914   *n_groups = 0;
 915
 916   if (dbus_connection_get_unix_user (connection, &uid))
 917     {
 918       if (!_dbus_unix_groups_from_uid (uid, groups, n_groups))
 919         {
 920           _dbus_verbose ("Did not get any groups for UID %lu\n",
 921                          uid);
 922           return FALSE;
 923         }
 924       else
 925         {
 926           _dbus_verbose ("Got %d groups for UID %lu\n",
 927                          *n_groups, uid);
 928           return TRUE;
 929         }
 930     }
 931   else
 932     return TRUE; /* successfully got 0 groups */
 933 }
 934
 935 dbus_bool_t
 936 bus_connection_is_in_unix_group (DBusConnection *connection,
 937                                  unsigned long   gid)
 938 {
 939   int i;
 940   unsigned long *group_ids;
 941   int n_group_ids;
 942
 943   if (!bus_connection_get_unix_groups (connection, &group_ids, &n_group_ids,
 944                                        NULL))
 945     return FALSE;
 946
 947   i = 0;
 948   while (i < n_group_ids)
 949     {
 950       if (group_ids[i] == gid)
 951         {
 952           dbus_free (group_ids);
 953           return TRUE;
 954         }
 955       ++i;
 956     }
 957
 958   dbus_free (group_ids);
 959   return FALSE;
 960 }
 961
 962 const char *
 963 bus_connection_get_loginfo (DBusConnection        *connection)
 964 {
 965   BusConnectionData *d;
 966
 967   d = BUS_CONNECTION_DATA (connection);
 968
 969   if (!bus_connection_is_active (connection))
 970     return "inactive";
 971   return d->cached_loginfo_string;
 972 }
 973
 974 BusClientPolicy*
 975 bus_connection_get_policy (DBusConnection *connection)
 976 {
 977   BusConnectionData *d;
 978
 979   d = BUS_CONNECTION_DATA (connection);
 980
 981   _dbus_assert (d != NULL);
 982   _dbus_assert (d->policy != NULL);
 983
 984   return d->policy;
 985 }
 986
 987 static dbus_bool_t
 988 foreach_active (BusConnections               *connections,
 989                 BusConnectionForeachFunction  function,
 990                 void                         *data)
 991 {
 992   DBusList *link;
 993
 994   link = _dbus_list_get_first_link (&connections->completed);
 995   while (link != NULL)
 996     {
 997       DBusConnection *connection = link->data;
 998       DBusList *next = _dbus_list_get_next_link (&connections->completed, link);
 999
1000       if (!(* function) (connection, data))
1001         return FALSE;
1002
1003       link = next;
1004     }
1005
1006   return TRUE;
1007 }
1008
1009 static dbus_bool_t
1010 foreach_inactive (BusConnections               *connections,
1011                   BusConnectionForeachFunction  function,
1012                   void                         *data)
1013 {
1014   DBusList *link;
1015
1016   link = _dbus_list_get_first_link (&connections->incomplete);
1017   while (link != NULL)
1018     {
1019       DBusConnection *connection = link->data;
1020       DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
1021
1022       if (!(* function) (connection, data))
1023         return FALSE;
1024
1025       link = next;
1026     }
1027
1028   return TRUE;
1029 }
1030
1031 /**
1032  * Calls function on each active connection; if the function returns
1033  * #FALSE, stops iterating. Active connections are authenticated
1034  * and have sent a Hello message.
1035  *
1036  * @param connections the connections object
1037  * @param function the function
1038  * @param data data to pass to it as a second arg
1039  */
1040 void
1041 bus_connections_foreach_active (BusConnections               *connections,
1042                                 BusConnectionForeachFunction  function,
1043                                 void                         *data)
1044 {
1045   foreach_active (connections, function, data);
1046 }
1047
1048 /**
1049  * Calls function on each connection; if the function returns
1050  * #FALSE, stops iterating.
1051  *
1052  * @param connections the connections object
1053  * @param function the function
1054  * @param data data to pass to it as a second arg
1055  */
1056 void
1057 bus_connections_foreach (BusConnections               *connections,
1058                          BusConnectionForeachFunction  function,
1059                          void                         *data)
1060 {
1061   if (!foreach_active (connections, function, data))
1062     return;
1063
1064   foreach_inactive (connections, function, data);
1065 }
1066
1067 BusContext*
1068 bus_connections_get_context (BusConnections *connections)
1069 {
1070   return connections->context;
1071 }
1072
1073 /*
1074  * This is used to avoid covering the same connection twice when
1075  * traversing connections. Note that it assumes we will
1076  * bus_connection_mark_stamp() each connection at least once per
1077  * INT_MAX increments of the global stamp, or wraparound would break
1078  * things.
1079  */
1080 void
1081 bus_connections_increment_stamp (BusConnections *connections)
1082 {
1083   connections->stamp += 1;
1084 }
1085
1086 /* Mark connection with current stamp, return TRUE if it
1087  * didn't already have that stamp
1088  */
1089 dbus_bool_t
1090 bus_connection_mark_stamp (DBusConnection *connection)
1091 {
1092   BusConnectionData *d;
1093
1094   d = BUS_CONNECTION_DATA (connection);
1095
1096   _dbus_assert (d != NULL);
1097
1098   if (d->stamp == d->connections->stamp)
1099     return FALSE;
1100   else
1101     {
1102       d->stamp = d->connections->stamp;
1103       return TRUE;
1104     }
1105 }
1106
1107 BusContext*
1108 bus_connection_get_context (DBusConnection *connection)
1109 {
1110   BusConnectionData *d;
1111
1112   d = BUS_CONNECTION_DATA (connection);
1113
1114   _dbus_assert (d != NULL);
1115
1116   return d->connections->context;
1117 }
1118
1119 BusConnections*
1120 bus_connection_get_connections (DBusConnection *connection)
1121 {
1122   BusConnectionData *d;
1123
1124   d = BUS_CONNECTION_DATA (connection);
1125
1126   _dbus_assert (d != NULL);
1127
1128   return d->connections;
1129 }
1130
1131 BusRegistry*
1132 bus_connection_get_registry (DBusConnection *connection)
1133 {
1134   BusConnectionData *d;
1135
1136   d = BUS_CONNECTION_DATA (connection);
1137
1138   _dbus_assert (d != NULL);
1139
1140   return bus_context_get_registry (d->connections->context);
1141 }
1142
1143 BusActivation*
1144 bus_connection_get_activation (DBusConnection *connection)
1145 {
1146   BusConnectionData *d;
1147
1148   d = BUS_CONNECTION_DATA (connection);
1149
1150   _dbus_assert (d != NULL);
1151
1152   return bus_context_get_activation (d->connections->context);
1153 }
1154
1155 BusMatchmaker*
1156 bus_connection_get_matchmaker (DBusConnection *connection)
1157 {
1158   BusConnectionData *d;
1159
1160   d = BUS_CONNECTION_DATA (connection);
1161
1162   _dbus_assert (d != NULL);
1163
1164   return bus_context_get_matchmaker (d->connections->context);
1165 }
1166
1167 BusSELinuxID*
1168 bus_connection_get_selinux_id (DBusConnection *connection)
1169 {
1170   BusConnectionData *d;
1171
1172   d = BUS_CONNECTION_DATA (connection);
1173
1174   _dbus_assert (d != NULL);
1175
1176   return d->selinux_id;
1177 }
1178
1179 /**
1180  * Checks whether the connection is registered with the message bus.
1181  *
1182  * @param connection the connection
1183  * @returns #TRUE if we're an active message bus participant
1184  */
1185 dbus_bool_t
1186 bus_connection_is_active (DBusConnection *connection)
1187 {
1188   BusConnectionData *d;
1189
1190   d = BUS_CONNECTION_DATA (connection);
1191
1192   return d != NULL && d->name != NULL;
1193 }
1194
1195 dbus_bool_t
1196 bus_connection_preallocate_oom_error (DBusConnection *connection)
1197 {
1198   DBusMessage *message;
1199   DBusPreallocatedSend *preallocated;
1200   BusConnectionData *d;
1201
1202   d = BUS_CONNECTION_DATA (connection);
1203
1204   _dbus_assert (d != NULL);
1205
1206   if (d->oom_preallocated != NULL)
1207     return TRUE;
1208
1209   preallocated = dbus_connection_preallocate_send (connection);
1210   if (preallocated == NULL)
1211     return FALSE;
1212
1213   message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1214
1215   if (message == NULL)
1216     {
1217       dbus_connection_free_preallocated_send (connection, preallocated);
1218       return FALSE;
1219     }
1220
1221   /* d->name may be NULL, but that is OK */
1222   if (!dbus_message_set_error_name (message, DBUS_ERROR_NO_MEMORY) ||
1223       !dbus_message_set_destination (message, d->name) ||
1224       !dbus_message_set_sender (message,
1225                                 DBUS_SERVICE_DBUS))
1226     {
1227       dbus_connection_free_preallocated_send (connection, preallocated);
1228       dbus_message_unref (message);
1229       return FALSE;
1230     }
1231
1232   /* set reply serial to placeholder value just so space is already allocated
1233    * for it.
1234    */
1235   if (!dbus_message_set_reply_serial (message, 14))
1236     {
1237       dbus_connection_free_preallocated_send (connection, preallocated);
1238       dbus_message_unref (message);
1239       return FALSE;
1240     }
1241
1242   d->oom_message = message;
1243   d->oom_preallocated = preallocated;
1244
1245   return TRUE;
1246 }
1247
1248 void
1249 bus_connection_send_oom_error (DBusConnection *connection,
1250                                DBusMessage    *in_reply_to)
1251 {
1252   BusConnectionData *d;
1253
1254   d = BUS_CONNECTION_DATA (connection);
1255
1256   _dbus_assert (d != NULL);
1257   _dbus_assert (d->oom_message != NULL);
1258
1259   /* should always succeed since we set it to a placeholder earlier */
1260   if (!dbus_message_set_reply_serial (d->oom_message,
1261                                       dbus_message_get_serial (in_reply_to)))
1262     _dbus_assert_not_reached ("Failed to set reply serial for preallocated oom message");
1263
1264   _dbus_assert (dbus_message_get_sender (d->oom_message) != NULL);
1265
1266   dbus_connection_send_preallocated (connection, d->oom_preallocated,
1267                                      d->oom_message, NULL);
1268
1269   dbus_message_unref (d->oom_message);
1270   d->oom_message = NULL;
1271   d->oom_preallocated = NULL;
1272 }
1273
1274 #ifdef DBUS_ENABLE_STATS
1275 static void
1276 update_peak (int *peak,
1277              int n)
1278 {
1279   if (*peak < n)
1280     *peak = n;
1281 }
1282 #endif
1283
1284 void
1285 bus_connection_add_match_rule_link (DBusConnection *connection,
1286                                     DBusList       *link)
1287 {
1288   BusConnectionData *d;
1289
1290   d = BUS_CONNECTION_DATA (connection);
1291   _dbus_assert (d != NULL);
1292
1293   _dbus_list_append_link (&d->match_rules, link);
1294
1295   d->n_match_rules += 1;
1296
1297 #ifdef DBUS_ENABLE_STATS
1298   update_peak (&d->peak_match_rules, d->n_match_rules);
1299   update_peak (&d->connections->peak_match_rules_per_conn, d->n_match_rules);
1300
1301   d->connections->total_match_rules += 1;
1302   update_peak (&d->connections->peak_match_rules,
1303                d->connections->total_match_rules);
1304 #endif
1305 }
1306
1307 dbus_bool_t
1308 bus_connection_add_match_rule (DBusConnection *connection,
1309                                BusMatchRule   *rule)
1310 {
1311     DBusList *link;
1312
1313   link = _dbus_list_alloc_link (rule);
1314
1315   if (link == NULL)
1316     return FALSE;
1317
1318   bus_connection_add_match_rule_link (connection, link);
1319
1320   return TRUE;
1321 }
1322
1323 void
1324 bus_connection_remove_match_rule (DBusConnection *connection,
1325                                   BusMatchRule   *rule)
1326 {
1327   BusConnectionData *d;
1328
1329   d = BUS_CONNECTION_DATA (connection);
1330   _dbus_assert (d != NULL);
1331
1332   _dbus_list_remove_last (&d->match_rules, rule);
1333
1334   d->n_match_rules -= 1;
1335   _dbus_assert (d->n_match_rules >= 0);
1336
1337 #ifdef DBUS_ENABLE_STATS
1338   d->connections->total_match_rules -= 1;
1339 #endif
1340 }
1341
1342 int
1343 bus_connection_get_n_match_rules (DBusConnection *connection)
1344 {
1345   BusConnectionData *d;
1346
1347   d = BUS_CONNECTION_DATA (connection);
1348   _dbus_assert (d != NULL);
1349
1350   return d->n_match_rules;
1351 }
1352
1353 void
1354 bus_connection_add_owned_service_link (DBusConnection *connection,
1355                                        DBusList       *link)
1356 {
1357   BusConnectionData *d;
1358
1359   d = BUS_CONNECTION_DATA (connection);
1360   _dbus_assert (d != NULL);
1361
1362   _dbus_list_append_link (&d->services_owned, link);
1363
1364   d->n_services_owned += 1;
1365
1366 #ifdef DBUS_ENABLE_STATS
1367   update_peak (&d->peak_bus_names, d->n_services_owned);
1368   update_peak (&d->connections->peak_bus_names_per_conn,
1369                d->n_services_owned);
1370
1371   d->connections->total_bus_names += 1;
1372   update_peak (&d->connections->peak_bus_names,
1373                d->connections->total_bus_names);
1374 #endif
1375 }
1376
1377 dbus_bool_t
1378 bus_connection_add_owned_service (DBusConnection *connection,
1379                                   BusService     *service)
1380 {
1381   DBusList *link;
1382
1383   link = _dbus_list_alloc_link (service);
1384
1385   if (link == NULL)
1386     return FALSE;
1387
1388   bus_connection_add_owned_service_link (connection, link);
1389
1390   return TRUE;
1391 }
1392
1393 void
1394 bus_connection_remove_owned_service (DBusConnection *connection,
1395                                      BusService     *service)
1396 {
1397   BusConnectionData *d;
1398
1399   d = BUS_CONNECTION_DATA (connection);
1400   _dbus_assert (d != NULL);
1401
1402   _dbus_list_remove_last (&d->services_owned, service);
1403
1404   d->n_services_owned -= 1;
1405   _dbus_assert (d->n_services_owned >= 0);
1406
1407 #ifdef DBUS_ENABLE_STATS
1408   d->connections->total_bus_names -= 1;
1409 #endif
1410 }
1411
1412 int
1413 bus_connection_get_n_services_owned (DBusConnection *connection)
1414 {
1415   BusConnectionData *d;
1416
1417   d = BUS_CONNECTION_DATA (connection);
1418   _dbus_assert (d != NULL);
1419
1420   return d->n_services_owned;
1421 }
1422
1423 dbus_bool_t
1424 bus_connection_complete (DBusConnection   *connection,
1425                          const DBusString *name,
1426                          DBusError        *error)
1427 {
1428   BusConnectionData *d;
1429   unsigned long uid;
1430
1431   d = BUS_CONNECTION_DATA (connection);
1432   _dbus_assert (d != NULL);
1433   _dbus_assert (d->name == NULL);
1434   _dbus_assert (d->policy == NULL);
1435
1436   _dbus_assert (!bus_connection_is_active (connection));
1437
1438   if (!_dbus_string_copy_data (name, &d->name))
1439     {
1440       BUS_SET_OOM (error);
1441       return FALSE;
1442     }
1443
1444   _dbus_assert (d->name != NULL);
1445
1446   _dbus_verbose ("Name %s assigned to %p\n", d->name, connection);
1447
1448   d->policy = bus_context_create_client_policy (d->connections->context,
1449                                                 connection,
1450                                                 error);
1451
1452   /* we may have a NULL policy on OOM or error getting list of
1453    * groups for a user. In the latter case we don't handle it so
1454    * well currently, as it will just keep failing over and over.
1455    */
1456
1457   if (d->policy == NULL)
1458     {
1459       _dbus_verbose ("Failed to create security policy for connection %p\n",
1460                      connection);
1461       _DBUS_ASSERT_ERROR_IS_SET (error);
1462       dbus_free (d->name);
1463       d->name = NULL;
1464       return FALSE;
1465     }
1466
1467   if (dbus_connection_get_unix_user (connection, &uid))
1468     {
1469       if (!adjust_connections_for_uid (d->connections,
1470                                        uid, 1))
1471         goto fail;
1472     }
1473
1474   /* Create and cache a string which holds information about the
1475    * peer process; used for logging purposes.
1476    */
1477   if (!cache_peer_loginfo_string (d, connection))
1478     goto fail;
1479
1480   /* Now the connection is active, move it between lists */
1481   _dbus_list_unlink (&d->connections->incomplete,
1482                      d->link_in_connection_list);
1483   d->connections->n_incomplete -= 1;
1484   _dbus_list_append_link (&d->connections->completed,
1485                           d->link_in_connection_list);
1486   d->connections->n_completed += 1;
1487
1488   _dbus_assert (d->connections->n_incomplete >= 0);
1489   _dbus_assert (d->connections->n_completed > 0);
1490
1491   /* If we have dropped below the max. number of incomplete
1492    * connections, start accept()ing again */
1493   bus_context_check_all_watches (d->connections->context);
1494
1495   /* See if we can remove the timeout */
1496   bus_connections_expire_incomplete (d->connections);
1497
1498   _dbus_assert (bus_connection_is_active (connection));
1499
1500   return TRUE;
1501 fail:
1502   BUS_SET_OOM (error);
1503   dbus_free (d->name);
1504   d->name = NULL;
1505   if (d->policy)
1506     bus_client_policy_unref (d->policy);
1507   d->policy = NULL;
1508   return FALSE;
1509 }
1510
1511 dbus_bool_t
1512 bus_connections_reload_policy (BusConnections *connections,
1513                                DBusError      *error)
1514 {
1515   BusConnectionData *d;
1516   DBusConnection *connection;
1517   DBusList *link;
1518
1519   _dbus_assert (connections != NULL);
1520   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1521
1522   for (link = _dbus_list_get_first_link (&(connections->completed));
1523        link;
1524        link = _dbus_list_get_next_link (&(connections->completed), link))
1525     {
1526       connection = link->data;
1527       d = BUS_CONNECTION_DATA (connection);
1528       _dbus_assert (d != NULL);
1529       _dbus_assert (d->policy != NULL);
1530
1531       bus_client_policy_unref (d->policy);
1532       d->policy = bus_context_create_client_policy (connections->context,
1533                                                     connection,
1534                                                     error);
1535       if (d->policy == NULL)
1536         {
1537           _dbus_verbose ("Failed to create security policy for connection %p\n",
1538                       connection);
1539           _DBUS_ASSERT_ERROR_IS_SET (error);
1540           return FALSE;
1541         }
1542     }
1543
1544   return TRUE;
1545 }
1546
1547 const char *
1548 bus_connection_get_name (DBusConnection *connection)
1549 {
1550   BusConnectionData *d;
1551
1552   d = BUS_CONNECTION_DATA (connection);
1553   _dbus_assert (d != NULL);
1554
1555   return d->name;
1556 }
1557
1558 /**
1559  * Check whether completing the passed-in connection would
1560  * exceed limits, and if so set error and return #FALSE
1561  */
1562 dbus_bool_t
1563 bus_connections_check_limits (BusConnections  *connections,
1564                               DBusConnection  *requesting_completion,
1565                               DBusError       *error)
1566 {
1567   unsigned long uid;
1568
1569   if (connections->n_completed >=
1570       bus_context_get_max_completed_connections (connections->context))
1571     {
1572       dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1573                       "The maximum number of active connections has been reached");
1574       return FALSE;
1575     }
1576
1577   if (dbus_connection_get_unix_user (requesting_completion, &uid))
1578     {
1579       if (get_connections_for_uid (connections, uid) >=
1580           bus_context_get_max_connections_per_user (connections->context))
1581         {
1582           dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1583                           "The maximum number of active connections for UID %lu has been reached",
1584                           uid);
1585           return FALSE;
1586         }
1587     }
1588
1589   return TRUE;
1590 }
1591
1592 static void
1593 bus_pending_reply_free (BusPendingReply *pending)
1594 {
1595   _dbus_verbose ("Freeing pending reply %p, replier %p receiver %p serial %u\n",
1596                  pending,
1597                  pending->will_send_reply,
1598                  pending->will_get_reply,
1599                  pending->reply_serial);
1600
1601   dbus_free (pending);
1602 }
1603
1604 static dbus_bool_t
1605 bus_pending_reply_send_no_reply (BusConnections  *connections,
1606                                  BusTransaction  *transaction,
1607                                  BusPendingReply *pending)
1608 {
1609   DBusMessage *message;
1610   DBusMessageIter iter;
1611   dbus_bool_t retval;
1612   const char *errmsg;
1613
1614   retval = FALSE;
1615
1616   message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1617   if (message == NULL)
1618     return FALSE;
1619
1620   dbus_message_set_no_reply (message, TRUE);
1621
1622   if (!dbus_message_set_reply_serial (message,
1623                                       pending->reply_serial))
1624     goto out;
1625
1626   if (!dbus_message_set_error_name (message,
1627                                     DBUS_ERROR_NO_REPLY))
1628     goto out;
1629
1630   /* If you change these messages, adjust test/dbus-daemon.c to match */
1631   if (pending->will_send_reply == NULL)
1632     errmsg = "Message recipient disconnected from message bus without replying";
1633   else
1634     errmsg = "Message did not receive a reply (timeout by message bus)";
1635
1636   dbus_message_iter_init_append (message, &iter);
1637   if (!dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &errmsg))
1638     goto out;
1639
1640   if (!bus_transaction_send_from_driver (transaction, pending->will_get_reply,
1641                                          message))
1642     goto out;
1643
1644   retval = TRUE;
1645
1646  out:
1647   dbus_message_unref (message);
1648   return retval;
1649 }
1650
1651 static dbus_bool_t
1652 bus_pending_reply_expired (BusExpireList *list,
1653                            DBusList      *link,
1654                            void          *data)
1655 {
1656   BusPendingReply *pending = link->data;
1657   BusConnections *connections = data;
1658   BusTransaction *transaction;
1659
1660   /* No reply is forthcoming. So nuke it if we can. If not,
1661    * leave it in the list to try expiring again later when we
1662    * get more memory.
1663    */
1664
1665   _dbus_verbose ("Expiring pending reply %p, replier %p receiver %p serial %u\n",
1666                  pending,
1667                  pending->will_send_reply,
1668                  pending->will_get_reply,
1669                  pending->reply_serial);
1670
1671   transaction = bus_transaction_new (connections->context);
1672   if (transaction == NULL)
1673     return FALSE;
1674
1675   if (!bus_pending_reply_send_no_reply (connections,
1676                                         transaction,
1677                                         pending))
1678     {
1679       bus_transaction_cancel_and_free (transaction);
1680       return FALSE;
1681     }
1682
1683   bus_expire_list_remove_link (connections->pending_replies, link);
1684
1685   bus_pending_reply_free (pending);
1686   bus_transaction_execute_and_free (transaction);
1687
1688   return TRUE;
1689 }
1690
1691 static void
1692 bus_connection_drop_pending_replies (BusConnections  *connections,
1693                                      DBusConnection  *connection)
1694 {
1695   /* The DBusConnection is almost 100% finalized here, so you can't
1696    * do anything with it except check for pointer equality
1697    */
1698   DBusList *link;
1699
1700   _dbus_verbose ("Dropping pending replies that involve connection %p\n",
1701                  connection);
1702
1703   link = bus_expire_list_get_first_link (connections->pending_replies);
1704   while (link != NULL)
1705     {
1706       DBusList *next;
1707       BusPendingReply *pending;
1708
1709       next = bus_expire_list_get_next_link (connections->pending_replies,
1710                                             link);
1711       pending = link->data;
1712
1713       if (pending->will_get_reply == connection)
1714         {
1715           /* We don't need to track this pending reply anymore */
1716
1717           _dbus_verbose ("Dropping pending reply %p, replier %p receiver %p serial %u\n",
1718                          pending,
1719                          pending->will_send_reply,
1720                          pending->will_get_reply,
1721                          pending->reply_serial);
1722
1723           bus_expire_list_remove_link (connections->pending_replies,
1724                                        link);
1725           bus_pending_reply_free (pending);
1726         }
1727       else if (pending->will_send_reply == connection)
1728         {
1729           /* The reply isn't going to be sent, so set things
1730            * up so it will be expired right away
1731            */
1732           _dbus_verbose ("Will expire pending reply %p, replier %p receiver %p serial %u\n",
1733                          pending,
1734                          pending->will_send_reply,
1735                          pending->will_get_reply,
1736                          pending->reply_serial);
1737
1738           pending->will_send_reply = NULL;
1739           pending->expire_item.added_tv_sec = 0;
1740           pending->expire_item.added_tv_usec = 0;
1741
1742           bus_expire_list_recheck_immediately (connections->pending_replies);
1743         }
1744
1745       link = next;
1746     }
1747 }
1748
1749
1750 typedef struct
1751 {
1752   BusPendingReply *pending;
1753   BusConnections  *connections;
1754 } CancelPendingReplyData;
1755
1756 static void
1757 cancel_pending_reply (void *data)
1758 {
1759   CancelPendingReplyData *d = data;
1760
1761   _dbus_verbose ("d = %p\n", d);
1762
1763   if (!bus_expire_list_remove (d->connections->pending_replies,
1764                                &d->pending->expire_item))
1765     _dbus_assert_not_reached ("pending reply did not exist to be cancelled");
1766
1767   bus_pending_reply_free (d->pending); /* since it's been cancelled */
1768 }
1769
1770 static void
1771 cancel_pending_reply_data_free (void *data)
1772 {
1773   CancelPendingReplyData *d = data;
1774
1775   _dbus_verbose ("d = %p\n", d);
1776
1777   /* d->pending should be either freed or still
1778    * in the list of pending replies (owned by someone
1779    * else)
1780    */
1781
1782   dbus_free (d);
1783 }
1784
1785 /*
1786  * Record that a reply is allowed; return TRUE on success.
1787  */
1788 dbus_bool_t
1789 bus_connections_expect_reply (BusConnections  *connections,
1790                               BusTransaction  *transaction,
1791                               DBusConnection  *will_get_reply,
1792                               DBusConnection  *will_send_reply,
1793                               DBusMessage     *reply_to_this,
1794                               DBusError       *error)
1795 {
1796   BusPendingReply *pending;
1797   dbus_uint32_t reply_serial;
1798   DBusList *link;
1799   CancelPendingReplyData *cprd;
1800   int count;
1801
1802   _dbus_assert (will_get_reply != NULL);
1803   _dbus_assert (will_send_reply != NULL);
1804   _dbus_assert (reply_to_this != NULL);
1805
1806   if (dbus_message_get_no_reply (reply_to_this))
1807     return TRUE; /* we won't allow a reply, since client doesn't care for one. */
1808
1809   reply_serial = dbus_message_get_serial (reply_to_this);
1810
1811   link = bus_expire_list_get_first_link (connections->pending_replies);
1812   count = 0;
1813   while (link != NULL)
1814     {
1815       pending = link->data;
1816
1817       if (pending->reply_serial == reply_serial &&
1818           pending->will_get_reply == will_get_reply &&
1819           pending->will_send_reply == will_send_reply)
1820         {
1821           dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
1822                           "Message has the same reply serial as a currently-outstanding existing method call");
1823           return FALSE;
1824         }
1825
1826       link = bus_expire_list_get_next_link (connections->pending_replies,
1827                                             link);
1828       if (pending->will_get_reply == will_get_reply)
1829         ++count;
1830     }
1831
1832   if (count >=
1833       bus_context_get_max_replies_per_connection (connections->context))
1834     {
1835       dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1836                       "The maximum number of pending replies per connection has been reached");
1837       return FALSE;
1838     }
1839
1840   pending = dbus_new0 (BusPendingReply, 1);
1841   if (pending == NULL)
1842     {
1843       BUS_SET_OOM (error);
1844       return FALSE;
1845     }
1846
1847 #ifdef DBUS_ENABLE_VERBOSE_MODE
1848   /* so we can see a not-yet-added pending reply */
1849   pending->expire_item.added_tv_sec = 1;
1850   pending->expire_item.added_tv_usec = 1;
1851 #endif
1852
1853   pending->will_get_reply = will_get_reply;
1854   pending->will_send_reply = will_send_reply;
1855   pending->reply_serial = reply_serial;
1856
1857   cprd = dbus_new0 (CancelPendingReplyData, 1);
1858   if (cprd == NULL)
1859     {
1860       BUS_SET_OOM (error);
1861       bus_pending_reply_free (pending);
1862       return FALSE;
1863     }
1864
1865   if (!bus_expire_list_add (connections->pending_replies,
1866                             &pending->expire_item))
1867     {
1868       BUS_SET_OOM (error);
1869       dbus_free (cprd);
1870       bus_pending_reply_free (pending);
1871       return FALSE;
1872     }
1873
1874   if (!bus_transaction_add_cancel_hook (transaction,
1875                                         cancel_pending_reply,
1876                                         cprd,
1877                                         cancel_pending_reply_data_free))
1878     {
1879       BUS_SET_OOM (error);
1880       bus_expire_list_remove (connections->pending_replies, &pending->expire_item);
1881       dbus_free (cprd);
1882       bus_pending_reply_free (pending);
1883       return FALSE;
1884     }
1885
1886   cprd->pending = pending;
1887   cprd->connections = connections;
1888
1889   _dbus_get_monotonic_time (&pending->expire_item.added_tv_sec,
1890                             &pending->expire_item.added_tv_usec);
1891
1892   _dbus_verbose ("Added pending reply %p, replier %p receiver %p serial %u\n",
1893                  pending,
1894                  pending->will_send_reply,
1895                  pending->will_get_reply,
1896                  pending->reply_serial);
1897
1898   return TRUE;
1899 }
1900
1901 typedef struct
1902 {
1903   DBusList        *link;
1904   BusConnections  *connections;
1905 } CheckPendingReplyData;
1906
1907 static void
1908 cancel_check_pending_reply (void *data)
1909 {
1910   CheckPendingReplyData *d = data;
1911
1912   _dbus_verbose ("d = %p\n",d);
1913
1914   bus_expire_list_add_link (d->connections->pending_replies,
1915                             d->link);
1916   d->link = NULL;
1917 }
1918
1919 static void
1920 check_pending_reply_data_free (void *data)
1921 {
1922   CheckPendingReplyData *d = data;
1923
1924   _dbus_verbose ("d = %p\n",d);
1925
1926   if (d->link != NULL)
1927     {
1928       BusPendingReply *pending = d->link->data;
1929
1930       _dbus_assert (!bus_expire_list_contains_item (d->connections->pending_replies,
1931                                                     &pending->expire_item));
1932
1933       bus_pending_reply_free (pending);
1934       _dbus_list_free_link (d->link);
1935     }
1936
1937   dbus_free (d);
1938 }
1939
1940 /*
1941  * Check whether a reply is allowed, remove BusPendingReply
1942  * if so, return TRUE if so.
1943  */
1944 dbus_bool_t
1945 bus_connections_check_reply (BusConnections *connections,
1946                              BusTransaction *transaction,
1947                              DBusConnection *sending_reply,
1948                              DBusConnection *receiving_reply,
1949                              DBusMessage    *reply,
1950                              DBusError      *error)
1951 {
1952   CheckPendingReplyData *cprd;
1953   DBusList *link;
1954   dbus_uint32_t reply_serial;
1955
1956   _dbus_assert (sending_reply != NULL);
1957   _dbus_assert (receiving_reply != NULL);
1958
1959   reply_serial = dbus_message_get_reply_serial (reply);
1960
1961   link = bus_expire_list_get_first_link (connections->pending_replies);
1962   while (link != NULL)
1963     {
1964       BusPendingReply *pending = link->data;
1965
1966       if (pending->reply_serial == reply_serial &&
1967           pending->will_get_reply == receiving_reply &&
1968           pending->will_send_reply == sending_reply)
1969         {
1970           _dbus_verbose ("Found pending reply with serial %u\n", reply_serial);
1971           break;
1972         }
1973
1974       link = bus_expire_list_get_next_link (connections->pending_replies,
1975                                             link);
1976     }
1977
1978   if (link == NULL)
1979     {
1980       _dbus_verbose ("No pending reply expected\n");
1981
1982       return FALSE;
1983     }
1984
1985   cprd = dbus_new0 (CheckPendingReplyData, 1);
1986   if (cprd == NULL)
1987     {
1988       BUS_SET_OOM (error);
1989       return FALSE;
1990     }
1991
1992   if (!bus_transaction_add_cancel_hook (transaction,
1993                                         cancel_check_pending_reply,
1994                                         cprd,
1995                                         check_pending_reply_data_free))
1996     {
1997       BUS_SET_OOM (error);
1998       dbus_free (cprd);
1999       return FALSE;
2000     }
2001
2002   cprd->link = link;
2003   cprd->connections = connections;
2004
2005   bus_expire_list_unlink (connections->pending_replies,
2006                           link);
2007
2008   _dbus_assert (!bus_expire_list_contains_item (connections->pending_replies, link->data));
2009
2010   return TRUE;
2011 }
2012
2013 /*
2014  * Transactions
2015  *
2016  * Note that this is fairly fragile; in particular, don't try to use
2017  * one transaction across any main loop iterations.
2018  */
2019
2020 typedef struct
2021 {
2022   BusTransaction *transaction;
2023   DBusMessage    *message;
2024   DBusPreallocatedSend *preallocated;
2025 } MessageToSend;
2026
2027 typedef struct
2028 {
2029   BusTransactionCancelFunction cancel_function;
2030   DBusFreeFunction free_data_function;
2031   void *data;
2032 } CancelHook;
2033
2034 struct BusTransaction
2035 {
2036   DBusList *connections;
2037   BusContext *context;
2038   DBusList *cancel_hooks;
2039 };
2040
2041 static void
2042 message_to_send_free (DBusConnection *connection,
2043                       MessageToSend  *to_send)
2044 {
2045   if (to_send->message)
2046     dbus_message_unref (to_send->message);
2047
2048   if (to_send->preallocated)
2049     dbus_connection_free_preallocated_send (connection, to_send->preallocated);
2050
2051   dbus_free (to_send);
2052 }
2053
2054 static void
2055 cancel_hook_cancel (void *element,
2056                     void *data)
2057 {
2058   CancelHook *ch = element;
2059
2060   _dbus_verbose ("Running transaction cancel hook\n");
2061
2062   if (ch->cancel_function)
2063     (* ch->cancel_function) (ch->data);
2064 }
2065
2066 static void
2067 cancel_hook_free (void *element,
2068                   void *data)
2069 {
2070   CancelHook *ch = element;
2071
2072   if (ch->free_data_function)
2073     (* ch->free_data_function) (ch->data);
2074
2075   dbus_free (ch);
2076 }
2077
2078 static void
2079 free_cancel_hooks (BusTransaction *transaction)
2080 {
2081   _dbus_list_foreach (&transaction->cancel_hooks,
2082                       cancel_hook_free, NULL);
2083
2084   _dbus_list_clear (&transaction->cancel_hooks);
2085 }
2086
2087 BusTransaction*
2088 bus_transaction_new (BusContext *context)
2089 {
2090   BusTransaction *transaction;
2091
2092   transaction = dbus_new0 (BusTransaction, 1);
2093   if (transaction == NULL)
2094     return NULL;
2095
2096   transaction->context = context;
2097
2098   return transaction;
2099 }
2100
2101 BusContext*
2102 bus_transaction_get_context (BusTransaction  *transaction)
2103 {
2104   return transaction->context;
2105 }
2106
2107 dbus_bool_t
2108 bus_transaction_send_from_driver (BusTransaction *transaction,
2109                                   DBusConnection *connection,
2110                                   DBusMessage    *message)
2111 {
2112   /* We have to set the sender to the driver, and have
2113    * to check security policy since it was not done in
2114    * dispatch.c
2115    */
2116   _dbus_verbose ("Sending %s %s %s from driver\n",
2117                  dbus_message_get_interface (message) ?
2118                  dbus_message_get_interface (message) : "(no interface)",
2119                  dbus_message_get_member (message) ?
2120                  dbus_message_get_member (message) : "(no member)",
2121                  dbus_message_get_error_name (message) ?
2122                  dbus_message_get_error_name (message) : "(no error name)");
2123
2124   if (!dbus_message_set_sender (message, DBUS_SERVICE_DBUS))
2125     return FALSE;
2126
2127   if (bus_connection_is_active (connection))
2128     {
2129       if (!dbus_message_set_destination (message,
2130                                          bus_connection_get_name (connection)))
2131         return FALSE;
2132     }
2133
2134   /* bus driver never wants a reply */
2135   dbus_message_set_no_reply (message, TRUE);
2136
2137   /* If security policy doesn't allow the message, we silently
2138    * eat it; the driver doesn't care about getting a reply.
2139    */
2140   if (!bus_context_check_security_policy (bus_transaction_get_context (transaction),
2141                                           transaction,
2142                                           NULL, connection, connection, message, NULL))
2143     return TRUE;
2144
2145   return bus_transaction_send (transaction, connection, message);
2146 }
2147
2148 dbus_bool_t
2149 bus_transaction_send (BusTransaction *transaction,
2150                       DBusConnection *connection,
2151                       DBusMessage    *message)
2152 {
2153   MessageToSend *to_send;
2154   BusConnectionData *d;
2155   DBusList *link;
2156
2157   _dbus_verbose ("  trying to add %s interface=%s member=%s error=%s to transaction%s\n",
2158                  dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_ERROR ? "error" :
2159                  dbus_message_get_reply_serial (message) != 0 ? "reply" :
2160                  "message",
2161                  dbus_message_get_interface (message) ?
2162                  dbus_message_get_interface (message) : "(unset)",
2163                  dbus_message_get_member (message) ?
2164                  dbus_message_get_member (message) : "(unset)",
2165                  dbus_message_get_error_name (message) ?
2166                  dbus_message_get_error_name (message) : "(unset)",
2167                  dbus_connection_get_is_connected (connection) ?
2168                  "" : " (disconnected)");
2169
2170   _dbus_assert (dbus_message_get_sender (message) != NULL);
2171
2172   if (!dbus_connection_get_is_connected (connection))
2173     return TRUE; /* silently ignore disconnected connections */
2174
2175   d = BUS_CONNECTION_DATA (connection);
2176   _dbus_assert (d != NULL);
2177
2178   to_send = dbus_new (MessageToSend, 1);
2179   if (to_send == NULL)
2180     {
2181       return FALSE;
2182     }
2183
2184   to_send->preallocated = dbus_connection_preallocate_send (connection);
2185   if (to_send->preallocated == NULL)
2186     {
2187       dbus_free (to_send);
2188       return FALSE;
2189     }
2190
2191   dbus_message_ref (message);
2192   to_send->message = message;
2193   to_send->transaction = transaction;
2194
2195   _dbus_verbose ("about to prepend message\n");
2196
2197   if (!_dbus_list_prepend (&d->transaction_messages, to_send))
2198     {
2199       message_to_send_free (connection, to_send);
2200       return FALSE;
2201     }
2202
2203   _dbus_verbose ("prepended message\n");
2204
2205   /* See if we already had this connection in the list
2206    * for this transaction. If we have a pending message,
2207    * then we should already be in transaction->connections
2208    */
2209   link = _dbus_list_get_first_link (&d->transaction_messages);
2210   _dbus_assert (link->data == to_send);
2211   link = _dbus_list_get_next_link (&d->transaction_messages, link);
2212   while (link != NULL)
2213     {
2214       MessageToSend *m = link->data;
2215       DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2216
2217       if (m->transaction == transaction)
2218         break;
2219
2220       link = next;
2221     }
2222
2223   if (link == NULL)
2224     {
2225       if (!_dbus_list_prepend (&transaction->connections, connection))
2226         {
2227           _dbus_list_remove (&d->transaction_messages, to_send);
2228           message_to_send_free (connection, to_send);
2229           return FALSE;
2230         }
2231     }
2232
2233   return TRUE;
2234 }
2235
2236 static void
2237 transaction_free (BusTransaction *transaction)
2238 {
2239   _dbus_assert (transaction->connections == NULL);
2240
2241   free_cancel_hooks (transaction);
2242
2243   dbus_free (transaction);
2244 }
2245
2246 static void
2247 connection_cancel_transaction (DBusConnection *connection,
2248                                BusTransaction *transaction)
2249 {
2250   DBusList *link;
2251   BusConnectionData *d;
2252
2253   d = BUS_CONNECTION_DATA (connection);
2254   _dbus_assert (d != NULL);
2255
2256   link = _dbus_list_get_first_link (&d->transaction_messages);
2257   while (link != NULL)
2258     {
2259       MessageToSend *m = link->data;
2260       DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2261
2262       if (m->transaction == transaction)
2263         {
2264           _dbus_list_remove_link (&d->transaction_messages,
2265                                   link);
2266
2267           message_to_send_free (connection, m);
2268         }
2269
2270       link = next;
2271     }
2272 }
2273
2274 void
2275 bus_transaction_cancel_and_free (BusTransaction *transaction)
2276 {
2277   DBusConnection *connection;
2278
2279   _dbus_verbose ("TRANSACTION: cancelled\n");
2280
2281   while ((connection = _dbus_list_pop_first (&transaction->connections)))
2282     connection_cancel_transaction (connection, transaction);
2283
2284   _dbus_list_foreach (&transaction->cancel_hooks,
2285                       cancel_hook_cancel, NULL);
2286
2287   transaction_free (transaction);
2288 }
2289
2290 static void
2291 connection_execute_transaction (DBusConnection *connection,
2292                                 BusTransaction *transaction)
2293 {
2294   DBusList *link;
2295   BusConnectionData *d;
2296
2297   d = BUS_CONNECTION_DATA (connection);
2298   _dbus_assert (d != NULL);
2299
2300   /* Send the queue in order (FIFO) */
2301   link = _dbus_list_get_last_link (&d->transaction_messages);
2302   while (link != NULL)
2303     {
2304       MessageToSend *m = link->data;
2305       DBusList *prev = _dbus_list_get_prev_link (&d->transaction_messages, link);
2306
2307       if (m->transaction == transaction)
2308         {
2309           _dbus_list_remove_link (&d->transaction_messages,
2310                                   link);
2311
2312           _dbus_assert (dbus_message_get_sender (m->message) != NULL);
2313
2314           dbus_connection_send_preallocated (connection,
2315                                              m->preallocated,
2316                                              m->message,
2317                                              NULL);
2318
2319           m->preallocated = NULL; /* so we don't double-free it */
2320
2321           message_to_send_free (connection, m);
2322         }
2323
2324       link = prev;
2325     }
2326 }
2327
2328 void
2329 bus_transaction_execute_and_free (BusTransaction *transaction)
2330 {
2331   /* For each connection in transaction->connections
2332    * send the messages
2333    */
2334   DBusConnection *connection;
2335
2336   _dbus_verbose ("TRANSACTION: executing\n");
2337
2338   while ((connection = _dbus_list_pop_first (&transaction->connections)))
2339     connection_execute_transaction (connection, transaction);
2340
2341   transaction_free (transaction);
2342 }
2343
2344 static void
2345 bus_connection_remove_transactions (DBusConnection *connection)
2346 {
2347   MessageToSend *to_send;
2348   BusConnectionData *d;
2349
2350   d = BUS_CONNECTION_DATA (connection);
2351   _dbus_assert (d != NULL);
2352
2353   while ((to_send = _dbus_list_get_first (&d->transaction_messages)))
2354     {
2355       /* only has an effect for the first MessageToSend listing this transaction */
2356       _dbus_list_remove (&to_send->transaction->connections,
2357                          connection);
2358
2359       _dbus_list_remove (&d->transaction_messages, to_send);
2360       message_to_send_free (connection, to_send);
2361     }
2362 }
2363
2364 /**
2365  * Converts the DBusError to a message reply
2366  */
2367 dbus_bool_t
2368 bus_transaction_send_error_reply (BusTransaction  *transaction,
2369                                   DBusConnection  *connection,
2370                                   const DBusError *error,
2371                                   DBusMessage     *in_reply_to)
2372 {
2373   DBusMessage *reply;
2374
2375   _dbus_assert (error != NULL);
2376   _DBUS_ASSERT_ERROR_IS_SET (error);
2377
2378   _dbus_verbose ("Sending error reply %s \"%s\"\n",
2379                  error->name, error->message);
2380
2381   reply = dbus_message_new_error (in_reply_to,
2382                                   error->name,
2383                                   error->message);
2384   if (reply == NULL)
2385     return FALSE;
2386
2387   if (!bus_transaction_send_from_driver (transaction, connection, reply))
2388     {
2389       dbus_message_unref (reply);
2390       return FALSE;
2391     }
2392
2393   dbus_message_unref (reply);
2394
2395   return TRUE;
2396 }
2397
2398 dbus_bool_t
2399 bus_transaction_add_cancel_hook (BusTransaction               *transaction,
2400                                  BusTransactionCancelFunction  cancel_function,
2401                                  void                         *data,
2402                                  DBusFreeFunction              free_data_function)
2403 {
2404   CancelHook *ch;
2405
2406   ch = dbus_new (CancelHook, 1);
2407   if (ch == NULL)
2408     return FALSE;
2409
2410   _dbus_verbose ("     adding cancel hook function = %p data = %p\n",
2411                  cancel_function, data);
2412
2413   ch->cancel_function = cancel_function;
2414   ch->data = data;
2415   ch->free_data_function = free_data_function;
2416
2417   /* It's important that the hooks get run in reverse order that they
2418    * were added
2419    */
2420   if (!_dbus_list_prepend (&transaction->cancel_hooks, ch))
2421     {
2422       dbus_free (ch);
2423       return FALSE;
2424     }
2425
2426   return TRUE;
2427 }
2428
2429 int
2430 bus_connections_get_n_active (BusConnections *connections)
2431 {
2432   return connections->n_completed;
2433 }
2434
2435 int
2436 bus_connections_get_n_incomplete (BusConnections *connections)
2437 {
2438   return connections->n_incomplete;
2439 }
2440
2441 #ifdef DBUS_ENABLE_STATS
2442 int
2443 bus_connections_get_total_match_rules (BusConnections *connections)
2444 {
2445   return connections->total_match_rules;
2446 }
2447
2448 int
2449 bus_connections_get_peak_match_rules (BusConnections *connections)
2450 {
2451   return connections->peak_match_rules;
2452 }
2453
2454 int
2455 bus_connections_get_peak_match_rules_per_conn (BusConnections *connections)
2456 {
2457   return connections->peak_match_rules_per_conn;
2458 }
2459
2460 int
2461 bus_connections_get_total_bus_names (BusConnections *connections)
2462 {
2463   return connections->total_bus_names;
2464 }
2465
2466 int
2467 bus_connections_get_peak_bus_names (BusConnections *connections)
2468 {
2469   return connections->peak_bus_names;
2470 }
2471
2472 int
2473 bus_connections_get_peak_bus_names_per_conn (BusConnections *connections)
2474 {
2475   return connections->peak_bus_names_per_conn;
2476 }
2477
2478 int
2479 bus_connection_get_peak_match_rules (DBusConnection *connection)
2480 {
2481   BusConnectionData *d;
2482
2483   d = BUS_CONNECTION_DATA (connection);
2484   return d->peak_match_rules;
2485 }
2486
2487 int
2488 bus_connection_get_peak_bus_names (DBusConnection *connection)
2489 {
2490   BusConnectionData *d;
2491
2492   d = BUS_CONNECTION_DATA (connection);
2493   return d->peak_bus_names;
2494 }
2495 #endif /* DBUS_ENABLE_STATS */