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 "apparmor.h"
  34 #include "check.h"
  35 #include <dbus/dbus-list.h>
  36 #include <dbus/dbus-hash.h>
  37 #include <dbus/dbus-timeout.h>
  38 #include <dbus/dbus-connection-internal.h>
  39 #include <dbus/dbus-internals.h>
  40 #include <dbus/dbus-message-internal.h>
  41 #ifdef DBUS_ENABLE_CYNARA
  42 #include <stdlib.h>
  43 #include <cynara-session.h>
  44 #include <stdio.h>
  45 #endif
  46
  47 /* Trim executed commands to this length; we want to keep logs readable */
  48 #define MAX_LOG_COMMAND_LEN 50
  49
  50 static void bus_connection_remove_transactions (DBusConnection *connection);
  51
  52 typedef struct
  53 {
  54   BusExpireItem expire_item;
  55
  56   DBusConnection *will_get_reply;
  57   DBusConnection *will_send_reply;
  58
  59   dbus_uint32_t reply_serial;
  60
  61 } BusPendingReply;
  62
  63 struct BusConnections
  64 {
  65   int refcount;
  66   DBusList *completed;  /**< List of all completed connections */
  67   int n_completed;      /**< Length of completed list */
  68   DBusList *incomplete; /**< List of all not-yet-active connections */
  69   int n_incomplete;     /**< Length of incomplete list */
  70   BusContext *context;
  71   DBusHashTable *completed_by_user; /**< Number of completed connections for each UID */
  72   DBusTimeout *expire_timeout; /**< Timeout for expiring incomplete connections. */
  73   int stamp;                   /**< Incrementing number */
  74   BusExpireList *pending_replies; /**< List of pending replies */
  75
  76   /** List of all monitoring connections, a subset of completed.
  77    * Each member is a #DBusConnection. */
  78   DBusList *monitors;
  79   BusMatchmaker *monitor_matchmaker;
  80
  81 #ifdef DBUS_ENABLE_STATS
  82   int total_match_rules;
  83   int peak_match_rules;
  84   int peak_match_rules_per_conn;
  85
  86   int total_bus_names;
  87   int peak_bus_names;
  88   int peak_bus_names_per_conn;
  89 #endif
  90 };
  91
  92 static dbus_int32_t connection_data_slot = -1;
  93
  94 typedef struct
  95 {
  96   BusConnections *connections;
  97   DBusList *link_in_connection_list;
  98   DBusConnection *connection;
  99   DBusList *services_owned;
 100   int n_services_owned;
 101   DBusList *match_rules;
 102   int n_match_rules;
 103   char *name;
 104   DBusList *transaction_messages; /**< Stuff we need to send as part of a transaction */
 105   DBusMessage *oom_message;
 106   DBusPreallocatedSend *oom_preallocated;
 107   BusClientPolicy *policy;
 108   DBusList *deferred_messages;  /**< Queue of messages deferred due to pending policy check */
 109
 110   char *cached_loginfo_string;
 111   BusSELinuxID *selinux_id;
 112   BusAppArmorConfinement *apparmor_confinement;
 113
 114   long connection_tv_sec;  /**< Time when we connected (seconds component) */
 115   long connection_tv_usec; /**< Time when we connected (microsec component) */
 116   int stamp;               /**< connections->stamp last time we were traversed */
 117
 118 #ifdef DBUS_ENABLE_STATS
 119   int peak_match_rules;
 120   int peak_bus_names;
 121   int peak_pending_replies;
 122 #endif
 123   int n_pending_unix_fds;
 124   DBusTimeout *pending_unix_fds_timeout;
 125
 126   /** non-NULL if and only if this is a monitor */
 127   DBusList *link_in_monitors;
 128 #ifdef DBUS_ENABLE_CYNARA
 129   char *cynara_session_id;
 130 #endif
 131 } BusConnectionData;
 132
 133 static dbus_bool_t bus_pending_reply_expired (BusExpireList *list,
 134                                               DBusList      *link,
 135                                               void          *data);
 136
 137 static void bus_connection_drop_pending_replies (BusConnections  *connections,
 138                                                  DBusConnection  *connection);
 139
 140 static dbus_bool_t expire_incomplete_timeout (void *data);
 141
 142 #define BUS_CONNECTION_DATA(connection) (dbus_connection_get_data ((connection), connection_data_slot))
 143
 144 DBusLoop*
 145 bus_connection_get_loop (DBusConnection *connection)
 146 {
 147   BusConnectionData *d;
 148
 149   d = BUS_CONNECTION_DATA (connection);
 150   _dbus_assert(d != NULL);
 151
 152   return bus_context_get_loop (d->connections->context);
 153 }
 154
 155
 156 static int
 157 get_connections_for_uid (BusConnections *connections,
 158                          dbus_uid_t      uid)
 159 {
 160   void *val;
 161   int current_count;
 162
 163   /* val is NULL is 0 when it isn't in the hash yet */
 164
 165   val = _dbus_hash_table_lookup_uintptr (connections->completed_by_user,
 166                                        uid);
 167
 168   current_count = _DBUS_POINTER_TO_INT (val);
 169
 170   return current_count;
 171 }
 172
 173 static dbus_bool_t
 174 adjust_connections_for_uid (BusConnections *connections,
 175                             dbus_uid_t      uid,
 176                             int             adjustment)
 177 {
 178   int current_count;
 179
 180   current_count = get_connections_for_uid (connections, uid);
 181
 182   _dbus_verbose ("Adjusting connection count for UID " DBUS_UID_FORMAT
 183                  ": was %d adjustment %d making %d\n",
 184                  uid, current_count, adjustment, current_count + adjustment);
 185
 186   _dbus_assert (current_count >= 0);
 187
 188   current_count += adjustment;
 189
 190   _dbus_assert (current_count >= 0);
 191
 192   if (current_count == 0)
 193     {
 194       _dbus_hash_table_remove_uintptr (connections->completed_by_user, uid);
 195       return TRUE;
 196     }
 197   else
 198     {
 199       dbus_bool_t retval;
 200
 201       retval = _dbus_hash_table_insert_uintptr (connections->completed_by_user,
 202                                               uid, _DBUS_INT_TO_POINTER (current_count));
 203
 204       /* only positive adjustment can fail as otherwise
 205        * a hash entry should already exist
 206        */
 207       _dbus_assert (adjustment > 0 ||
 208                     (adjustment <= 0 && retval));
 209
 210       return retval;
 211     }
 212 }
 213
 214 void
 215 bus_connection_disconnected (DBusConnection *connection)
 216 {
 217   BusConnectionData *d;
 218   BusService *service;
 219   BusMatchmaker *matchmaker;
 220
 221   d = BUS_CONNECTION_DATA (connection);
 222   _dbus_assert (d != NULL);
 223
 224   _dbus_verbose ("%s disconnected, dropping all service ownership and releasing\n",
 225                  d->name ? d->name : "(inactive)");
 226
 227   /* Delete our match rules */
 228   if (d->n_match_rules > 0)
 229     {
 230       matchmaker = bus_context_get_matchmaker (d->connections->context);
 231       bus_matchmaker_disconnected (matchmaker, connection);
 232     }
 233
 234   /* Drop any service ownership. Unfortunately, this requires
 235    * memory allocation and there doesn't seem to be a good way to
 236    * handle it other than sleeping; we can't "fail" the operation of
 237    * disconnecting a client, and preallocating a broadcast "service is
 238    * now gone" message for every client-service pair seems kind of
 239    * involved.
 240    */
 241   while ((service = _dbus_list_get_last (&d->services_owned)))
 242     {
 243       BusTransaction *transaction;
 244       DBusError error;
 245
 246     retry:
 247
 248       dbus_error_init (&error);
 249
 250       while ((transaction = bus_transaction_new (d->connections->context)) == NULL)
 251         _dbus_wait_for_memory ();
 252
 253       if (!bus_service_remove_owner (service, connection,
 254                                      transaction, &error))
 255         {
 256           _DBUS_ASSERT_ERROR_IS_SET (&error);
 257
 258           if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY))
 259             {
 260               dbus_error_free (&error);
 261               bus_transaction_cancel_and_free (transaction);
 262               _dbus_wait_for_memory ();
 263               goto retry;
 264             }
 265           else
 266             {
 267               _dbus_verbose ("Failed to remove service owner: %s %s\n",
 268                              error.name, error.message);
 269               _dbus_assert_not_reached ("Removing service owner failed for non-memory-related reason");
 270             }
 271         }
 272
 273       bus_transaction_execute_and_free (transaction);
 274     }
 275
 276   bus_connection_clear_deferred_messages(connection);
 277
 278   bus_dispatch_remove_connection (connection);
 279
 280   /* no more watching */
 281   if (!dbus_connection_set_watch_functions (connection,
 282                                             NULL, NULL, NULL,
 283                                             connection,
 284                                             NULL))
 285     _dbus_assert_not_reached ("setting watch functions to NULL failed");
 286
 287   if (!dbus_connection_set_timeout_functions (connection,
 288                                               NULL, NULL, NULL,
 289                                               connection,
 290                                               NULL))
 291     _dbus_assert_not_reached ("setting timeout functions to NULL failed");
 292
 293   dbus_connection_set_unix_user_function (connection,
 294                                           NULL, NULL, NULL);
 295   dbus_connection_set_windows_user_function (connection,
 296                                              NULL, NULL, NULL);
 297
 298   dbus_connection_set_dispatch_status_function (connection,
 299                                                 NULL, NULL, NULL);
 300
 301   if (d->pending_unix_fds_timeout)
 302     {
 303       _dbus_loop_remove_timeout (bus_context_get_loop (d->connections->context),
 304                                  d->pending_unix_fds_timeout);
 305       _dbus_timeout_unref (d->pending_unix_fds_timeout);
 306     }
 307   d->pending_unix_fds_timeout = NULL;
 308   _dbus_connection_set_pending_fds_function (connection, NULL, NULL);
 309
 310   bus_connection_remove_transactions (connection);
 311
 312   if (d->link_in_monitors != NULL)
 313     {
 314       BusMatchmaker *mm = d->connections->monitor_matchmaker;
 315
 316       if (mm != NULL)
 317         bus_matchmaker_disconnected (mm, connection);
 318
 319       _dbus_list_remove_link (&d->connections->monitors, d->link_in_monitors);
 320       d->link_in_monitors = NULL;
 321     }
 322
 323   if (d->link_in_connection_list != NULL)
 324     {
 325       if (d->name != NULL)
 326         {
 327           unsigned long uid;
 328
 329           _dbus_list_remove_link (&d->connections->completed, d->link_in_connection_list);
 330           d->link_in_connection_list = NULL;
 331           d->connections->n_completed -= 1;
 332
 333           if (dbus_connection_get_unix_user (connection, &uid))
 334             {
 335               if (!adjust_connections_for_uid (d->connections,
 336                                                uid, -1))
 337                 _dbus_assert_not_reached ("adjusting downward should never fail");
 338             }
 339         }
 340       else
 341         {
 342           _dbus_list_remove_link (&d->connections->incomplete, d->link_in_connection_list);
 343           d->link_in_connection_list = NULL;
 344           d->connections->n_incomplete -= 1;
 345
 346           /* If we have dropped below the max. number of incomplete
 347            * connections, start accept()ing again */
 348           bus_context_check_all_watches (d->connections->context);
 349         }
 350
 351       _dbus_assert (d->connections->n_incomplete >= 0);
 352       _dbus_assert (d->connections->n_completed >= 0);
 353     }
 354
 355   bus_connection_drop_pending_replies (d->connections, connection);
 356
 357   /* frees "d" as side effect */
 358   dbus_connection_set_data (connection,
 359                             connection_data_slot,
 360                             NULL, NULL);
 361
 362   dbus_connection_unref (connection);
 363 }
 364
 365 static dbus_bool_t
 366 add_connection_watch (DBusWatch      *watch,
 367                       void           *data)
 368 {
 369   DBusConnection *connection = data;
 370
 371   return _dbus_loop_add_watch (bus_connection_get_loop (connection), watch);
 372 }
 373
 374 static void
 375 remove_connection_watch (DBusWatch      *watch,
 376                          void           *data)
 377 {
 378   DBusConnection *connection = data;
 379
 380   _dbus_loop_remove_watch (bus_connection_get_loop (connection), watch);
 381 }
 382
 383 static void
 384 toggle_connection_watch (DBusWatch      *watch,
 385                          void           *data)
 386 {
 387   DBusConnection *connection = data;
 388
 389   _dbus_loop_toggle_watch (bus_connection_get_loop (connection), watch);
 390 }
 391
 392 static dbus_bool_t
 393 add_connection_timeout (DBusTimeout    *timeout,
 394                         void           *data)
 395 {
 396   DBusConnection *connection = data;
 397
 398   return _dbus_loop_add_timeout (bus_connection_get_loop (connection), timeout);
 399 }
 400
 401 static void
 402 remove_connection_timeout (DBusTimeout    *timeout,
 403                            void           *data)
 404 {
 405   DBusConnection *connection = data;
 406
 407   _dbus_loop_remove_timeout (bus_connection_get_loop (connection), timeout);
 408 }
 409
 410 static void
 411 dispatch_status_function (DBusConnection    *connection,
 412                           DBusDispatchStatus new_status,
 413                           void              *data)
 414 {
 415   DBusLoop *loop = data;
 416
 417   if (new_status != DBUS_DISPATCH_COMPLETE)
 418     {
 419       while (!_dbus_loop_queue_dispatch (loop, connection))
 420         _dbus_wait_for_memory ();
 421     }
 422 }
 423
 424 static dbus_bool_t
 425 allow_unix_user_function (DBusConnection *connection,
 426                           unsigned long   uid,
 427                           void           *data)
 428 {
 429   BusConnectionData *d;
 430
 431   d = BUS_CONNECTION_DATA (connection);
 432
 433   _dbus_assert (d != NULL);
 434
 435   return bus_context_allow_unix_user (d->connections->context, uid);
 436 }
 437
 438 static void
 439 free_connection_data (void *data)
 440 {
 441   BusConnectionData *d = data;
 442
 443   /* services_owned should be NULL since we should be disconnected */
 444   _dbus_assert (d->services_owned == NULL);
 445   _dbus_assert (d->n_services_owned == 0);
 446   /* similarly */
 447   _dbus_assert (d->transaction_messages == NULL);
 448
 449   if (d->oom_preallocated)
 450     dbus_connection_free_preallocated_send (d->connection, d->oom_preallocated);
 451
 452   if (d->oom_message)
 453     dbus_message_unref (d->oom_message);
 454
 455   if (d->policy)
 456     bus_client_policy_unref (d->policy);
 457
 458   if (d->apparmor_confinement)
 459     bus_apparmor_confinement_unref (d->apparmor_confinement);
 460
 461   dbus_free (d->cached_loginfo_string);
 462
 463   dbus_free (d->name);
 464
 465 #ifdef DBUS_ENABLE_CYNARA
 466   free (d->cynara_session_id);
 467 #endif
 468
 469   dbus_free (d);
 470 }
 471
 472 BusConnections*
 473 bus_connections_new (BusContext *context)
 474 {
 475   BusConnections *connections;
 476
 477   if (!dbus_connection_allocate_data_slot (&connection_data_slot))
 478     goto failed_0;
 479
 480   connections = dbus_new0 (BusConnections, 1);
 481   if (connections == NULL)
 482     goto failed_1;
 483
 484   connections->completed_by_user = _dbus_hash_table_new (DBUS_HASH_UINTPTR,
 485                                                          NULL, NULL);
 486   if (connections->completed_by_user == NULL)
 487     goto failed_2;
 488
 489   connections->expire_timeout = _dbus_timeout_new (100, /* irrelevant */
 490                                                    expire_incomplete_timeout,
 491                                                    connections, NULL);
 492   if (connections->expire_timeout == NULL)
 493     goto failed_3;
 494
 495   _dbus_timeout_disable (connections->expire_timeout);
 496
 497   connections->pending_replies = bus_expire_list_new (bus_context_get_loop (context),
 498                                                       bus_context_get_reply_timeout (context),
 499                                                       bus_pending_reply_expired,
 500                                                       connections);
 501   if (connections->pending_replies == NULL)
 502     goto failed_4;
 503
 504   if (!_dbus_loop_add_timeout (bus_context_get_loop (context),
 505                                connections->expire_timeout))
 506     goto failed_5;
 507
 508   connections->refcount = 1;
 509   connections->context = context;
 510
 511   return connections;
 512
 513  failed_5:
 514   bus_expire_list_free (connections->pending_replies);
 515  failed_4:
 516   _dbus_timeout_unref (connections->expire_timeout);
 517  failed_3:
 518   _dbus_hash_table_unref (connections->completed_by_user);
 519  failed_2:
 520   dbus_free (connections);
 521  failed_1:
 522   dbus_connection_free_data_slot (&connection_data_slot);
 523  failed_0:
 524   return NULL;
 525 }
 526
 527 BusConnections *
 528 bus_connections_ref (BusConnections *connections)
 529 {
 530   _dbus_assert (connections->refcount > 0);
 531   connections->refcount += 1;
 532
 533   return connections;
 534 }
 535
 536 void
 537 bus_connections_unref (BusConnections *connections)
 538 {
 539   _dbus_assert (connections->refcount > 0);
 540   connections->refcount -= 1;
 541   if (connections->refcount == 0)
 542     {
 543       /* drop all incomplete */
 544       while (connections->incomplete != NULL)
 545         {
 546           DBusConnection *connection;
 547
 548           connection = connections->incomplete->data;
 549
 550           dbus_connection_ref (connection);
 551           dbus_connection_close (connection);
 552           bus_connection_disconnected (connection);
 553           dbus_connection_unref (connection);
 554         }
 555
 556       _dbus_assert (connections->n_incomplete == 0);
 557
 558       /* drop all monitors */
 559       _dbus_list_clear (&connections->monitors);
 560
 561       /* drop all real connections */
 562       while (connections->completed != NULL)
 563         {
 564           DBusConnection *connection;
 565
 566           connection = connections->completed->data;
 567
 568           dbus_connection_ref (connection);
 569           dbus_connection_close (connection);
 570           bus_connection_disconnected (connection);
 571           dbus_connection_unref (connection);
 572         }
 573
 574       _dbus_assert (connections->n_completed == 0);
 575
 576       bus_expire_list_free (connections->pending_replies);
 577
 578       _dbus_loop_remove_timeout (bus_context_get_loop (connections->context),
 579                                  connections->expire_timeout);
 580
 581       _dbus_timeout_unref (connections->expire_timeout);
 582
 583       _dbus_hash_table_unref (connections->completed_by_user);
 584
 585       if (connections->monitor_matchmaker != NULL)
 586         bus_matchmaker_unref (connections->monitor_matchmaker);
 587
 588       dbus_free (connections);
 589
 590       dbus_connection_free_data_slot (&connection_data_slot);
 591     }
 592 }
 593
 594 /* Used for logging */
 595 static dbus_bool_t
 596 cache_peer_loginfo_string (BusConnectionData *d,
 597                            DBusConnection    *connection)
 598 {
 599   DBusString loginfo_buf;
 600   unsigned long uid;
 601   unsigned long pid;
 602   char *windows_sid = NULL, *security_label = NULL;
 603   dbus_bool_t prev_added;
 604
 605   if (!_dbus_string_init (&loginfo_buf))
 606     return FALSE;
 607
 608   prev_added = FALSE;
 609   if (dbus_connection_get_unix_user (connection, &uid))
 610     {
 611       if (!_dbus_string_append_printf (&loginfo_buf, "uid=%ld", uid))
 612         goto oom;
 613       else
 614         prev_added = TRUE;
 615     }
 616
 617   if (dbus_connection_get_unix_process_id (connection, &pid))
 618     {
 619       if (prev_added)
 620         {
 621           if (!_dbus_string_append_byte (&loginfo_buf, ' '))
 622             goto oom;
 623         }
 624       if (!_dbus_string_append_printf (&loginfo_buf, "pid=%ld comm=\"", pid))
 625         goto oom;
 626       /* Ignore errors here; we may not have permissions to read the
 627        * proc file. */
 628       _dbus_command_for_pid (pid, &loginfo_buf, MAX_LOG_COMMAND_LEN, NULL);
 629       if (!_dbus_string_append_byte (&loginfo_buf, '"'))
 630         goto oom;
 631       else
 632         prev_added = TRUE;
 633     }
 634
 635   if (dbus_connection_get_windows_user (connection, &windows_sid))
 636     {
 637       dbus_bool_t did_append;
 638
 639       if (prev_added)
 640         {
 641           if (!_dbus_string_append_byte (&loginfo_buf, ' '))
 642             goto oom;
 643         }
 644
 645       did_append = _dbus_string_append_printf (&loginfo_buf,
 646                                                "sid=\"%s\"", windows_sid);
 647       dbus_free (windows_sid);
 648       windows_sid = NULL;
 649       if (!did_append)
 650         goto oom;
 651       else
 652         prev_added = TRUE;
 653     }
 654
 655   if (_dbus_connection_get_linux_security_label (connection, &security_label))
 656     {
 657       dbus_bool_t did_append;
 658
 659       if (prev_added)
 660         {
 661           if (!_dbus_string_append_byte (&loginfo_buf, ' '))
 662             goto oom;
 663         }
 664
 665       did_append = _dbus_string_append_printf (&loginfo_buf,
 666                                                "label=\"%s\"", security_label);
 667       dbus_free (security_label);
 668       security_label = NULL;
 669       if (!did_append)
 670         goto oom;
 671       else
 672         prev_added = TRUE;
 673     }
 674
 675   if (!_dbus_string_steal_data (&loginfo_buf, &(d->cached_loginfo_string)))
 676     goto oom;
 677
 678   _dbus_string_free (&loginfo_buf);
 679
 680   return TRUE;
 681 oom:
 682    _dbus_string_free (&loginfo_buf);
 683    if (security_label != NULL)
 684      dbus_free (security_label);
 685    if (windows_sid != NULL)
 686      dbus_free (windows_sid);
 687
 688    return FALSE;
 689 }
 690
 691 static void
 692 check_pending_fds_cb (DBusConnection *connection)
 693 {
 694   BusConnectionData *d = BUS_CONNECTION_DATA (connection);
 695   int n_pending_unix_fds_old;
 696   int n_pending_unix_fds_new;
 697
 698   _dbus_assert(d != NULL);
 699
 700   n_pending_unix_fds_old = d->n_pending_unix_fds;
 701   n_pending_unix_fds_new = _dbus_connection_get_pending_fds_count (connection);
 702
 703   _dbus_verbose ("Pending fds count changed on connection %p: %d -> %d\n",
 704                  connection, n_pending_unix_fds_old, n_pending_unix_fds_new);
 705
 706   if (n_pending_unix_fds_old == 0 && n_pending_unix_fds_new > 0)
 707     {
 708       _dbus_timeout_restart (d->pending_unix_fds_timeout,
 709               bus_context_get_pending_fd_timeout (d->connections->context));
 710     }
 711
 712   if (n_pending_unix_fds_old > 0 && n_pending_unix_fds_new == 0)
 713     {
 714       _dbus_timeout_disable (d->pending_unix_fds_timeout);
 715     }
 716
 717
 718   d->n_pending_unix_fds = n_pending_unix_fds_new;
 719 }
 720
 721 static dbus_bool_t
 722 pending_unix_fds_timeout_cb (void *data)
 723 {
 724   DBusConnection *connection = data;
 725   BusConnectionData *d = BUS_CONNECTION_DATA (connection);
 726   int limit;
 727
 728   _dbus_assert (d != NULL);
 729   limit = bus_context_get_pending_fd_timeout (d->connections->context);
 730   bus_context_log (d->connections->context, DBUS_SYSTEM_LOG_WARNING,
 731       "Connection \"%s\" (%s) has had Unix fds pending for too long, "
 732       "closing it (pending_fd_timeout=%d ms)",
 733       d->name != NULL ? d->name : "(null)",
 734       bus_connection_get_loginfo (connection),
 735       limit);
 736
 737   dbus_connection_close (connection);
 738   return TRUE;
 739 }
 740
 741 dbus_bool_t
 742 bus_connections_setup_connection (BusConnections *connections,
 743                                   DBusConnection *connection)
 744 {
 745
 746   BusConnectionData *d = NULL;
 747   DBusError error;
 748
 749   d = dbus_new0 (BusConnectionData, 1);
 750
 751   if (d == NULL)
 752     goto oom;
 753
 754   d->connections = connections;
 755   d->connection = connection;
 756
 757   _dbus_get_monotonic_time (&d->connection_tv_sec,
 758                             &d->connection_tv_usec);
 759
 760   _dbus_assert (connection_data_slot >= 0);
 761
 762   if (!dbus_connection_set_data (connection,
 763                                  connection_data_slot,
 764                                  d, free_connection_data))
 765     {
 766       /* We have to free d explicitly, because this is the only code
 767        * path where it's non-NULL but dbus_connection_set_data() hasn't
 768        * taken responsibility for freeing it. */
 769       dbus_free (d);
 770       d = NULL;
 771       goto oom;
 772     }
 773
 774   dbus_connection_set_route_peer_messages (connection, TRUE);
 775
 776   dbus_error_init (&error);
 777   d->selinux_id = bus_selinux_init_connection_id (connection,
 778                                                   &error);
 779   if (dbus_error_is_set (&error))
 780     {
 781       bus_context_log (connections->context, DBUS_SYSTEM_LOG_WARNING,
 782                        "Unable to set up new connection: %s", error.message);
 783       dbus_error_free (&error);
 784       goto error;
 785     }
 786
 787   d->apparmor_confinement = bus_apparmor_init_connection_confinement (connection,
 788                                                                       &error);
 789   if (dbus_error_is_set (&error))
 790     {
 791       bus_context_log (connections->context, DBUS_SYSTEM_LOG_WARNING,
 792                        "Unable to set up new connection: %s", error.message);
 793       dbus_error_free (&error);
 794       goto error;
 795     }
 796
 797   if (!dbus_connection_set_watch_functions (connection,
 798                                             add_connection_watch,
 799                                             remove_connection_watch,
 800                                             toggle_connection_watch,
 801                                             connection,
 802                                             NULL))
 803     goto oom;
 804
 805   if (!dbus_connection_set_timeout_functions (connection,
 806                                               add_connection_timeout,
 807                                               remove_connection_timeout,
 808                                               NULL,
 809                                               connection, NULL))
 810     goto oom;
 811
 812   /* For now we don't need to set a Windows user function because
 813    * there are no policies in the config file controlling what
 814    * Windows users can connect. The default 'same user that owns the
 815    * bus can connect' behavior of DBusConnection is fine on Windows.
 816    */
 817   dbus_connection_set_unix_user_function (connection,
 818                                           allow_unix_user_function,
 819                                           NULL, NULL);
 820
 821   dbus_connection_set_dispatch_status_function (connection,
 822                                                 dispatch_status_function,
 823                                                 bus_context_get_loop (connections->context),
 824                                                 NULL);
 825
 826   d->link_in_connection_list = _dbus_list_alloc_link (connection);
 827   if (d->link_in_connection_list == NULL)
 828     goto oom;
 829
 830   /* Setup the connection with the dispatcher */
 831   if (!bus_dispatch_add_connection (connection))
 832     goto oom;
 833
 834   if (dbus_connection_get_dispatch_status (connection) != DBUS_DISPATCH_COMPLETE)
 835     {
 836       if (!_dbus_loop_queue_dispatch (bus_context_get_loop (connections->context), connection))
 837         {
 838           bus_dispatch_remove_connection (connection);
 839           goto oom;
 840         }
 841     }
 842
 843   /* Setup pending fds timeout (see #80559) */
 844   d->pending_unix_fds_timeout = _dbus_timeout_new (100, /* irrelevant */
 845                                                    pending_unix_fds_timeout_cb,
 846                                                    connection, NULL);
 847   if (d->pending_unix_fds_timeout == NULL)
 848     goto oom;
 849
 850   _dbus_timeout_disable (d->pending_unix_fds_timeout);
 851   if (!_dbus_loop_add_timeout (bus_context_get_loop (connections->context),
 852                                d->pending_unix_fds_timeout))
 853     goto oom;
 854
 855   _dbus_connection_set_pending_fds_function (connection,
 856           (DBusPendingFdsChangeFunction) check_pending_fds_cb,
 857           connection);
 858
 859   _dbus_list_append_link (&connections->incomplete, d->link_in_connection_list);
 860   connections->n_incomplete += 1;
 861
 862   dbus_connection_ref (connection);
 863
 864   bus_connections_expire_incomplete (connections);
 865
 866   /* The listening socket is removed from the main loop,
 867    * i.e. does not accept(), while n_incomplete is at its
 868    * maximum value; so we shouldn't get here in that case */
 869   _dbus_assert (connections->n_incomplete <=
 870       bus_context_get_max_incomplete_connections (connections->context));
 871
 872   /* If we have the maximum number of incomplete connections,
 873    * stop accept()ing any more, to avert a DoS. See fd.o #80919 */
 874   bus_context_check_all_watches (d->connections->context);
 875
 876   return TRUE;
 877
 878 oom:
 879   bus_context_log (connections->context, DBUS_SYSTEM_LOG_WARNING,
 880                    "No memory to set up new connection");
 881   /* fall through */
 882 error:
 883   if (d != NULL)
 884     {
 885       d->selinux_id = NULL;
 886
 887       if (d->apparmor_confinement)
 888         bus_apparmor_confinement_unref (d->apparmor_confinement);
 889       d->apparmor_confinement = NULL;
 890
 891       if (!dbus_connection_set_watch_functions (connection,
 892                                                 NULL, NULL, NULL,
 893                                                 connection,
 894                                                 NULL))
 895         _dbus_assert_not_reached ("setting watch functions to NULL failed");
 896
 897       if (!dbus_connection_set_timeout_functions (connection,
 898                                                   NULL, NULL, NULL,
 899                                                   connection,
 900                                                   NULL))
 901         _dbus_assert_not_reached ("setting timeout functions to NULL failed");
 902
 903       dbus_connection_set_unix_user_function (connection,
 904                                               NULL, NULL, NULL);
 905
 906       dbus_connection_set_windows_user_function (connection,
 907                                                  NULL, NULL, NULL);
 908
 909       dbus_connection_set_dispatch_status_function (connection,
 910                                                     NULL, NULL, NULL);
 911
 912       if (d->pending_unix_fds_timeout)
 913         _dbus_timeout_unref (d->pending_unix_fds_timeout);
 914
 915       d->pending_unix_fds_timeout = NULL;
 916
 917       _dbus_connection_set_pending_fds_function (connection, NULL, NULL);
 918
 919       if (d->link_in_connection_list != NULL)
 920         {
 921           _dbus_assert (d->link_in_connection_list->next == NULL);
 922           _dbus_assert (d->link_in_connection_list->prev == NULL);
 923           _dbus_list_free_link (d->link_in_connection_list);
 924           d->link_in_connection_list = NULL;
 925         }
 926
 927       if (!dbus_connection_set_data (connection,
 928                                      connection_data_slot,
 929                                      NULL, NULL))
 930         _dbus_assert_not_reached ("failed to set connection data to null");
 931
 932       /* "d" has now been freed */
 933     }
 934
 935   return FALSE;
 936 }
 937
 938 void
 939 bus_connections_expire_incomplete (BusConnections *connections)
 940 {
 941   int next_interval;
 942
 943   next_interval = -1;
 944
 945   if (connections->incomplete != NULL)
 946     {
 947       long tv_sec, tv_usec;
 948       DBusList *link;
 949       int auth_timeout;
 950
 951       _dbus_get_monotonic_time (&tv_sec, &tv_usec);
 952       auth_timeout = bus_context_get_auth_timeout (connections->context);
 953
 954       link = _dbus_list_get_first_link (&connections->incomplete);
 955       while (link != NULL)
 956         {
 957           DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
 958           DBusConnection *connection;
 959           BusConnectionData *d;
 960           double elapsed;
 961
 962           connection = link->data;
 963
 964           d = BUS_CONNECTION_DATA (connection);
 965
 966           _dbus_assert (d != NULL);
 967
 968           elapsed = ELAPSED_MILLISECONDS_SINCE (d->connection_tv_sec,
 969                                                 d->connection_tv_usec,
 970                                                 tv_sec, tv_usec);
 971
 972           if (elapsed >= (double) auth_timeout)
 973             {
 974               /* Unfortunately, we can't identify the connection: it doesn't
 975                * have a unique name yet, we don't know its uid/pid yet,
 976                * and so on. */
 977               bus_context_log (connections->context, DBUS_SYSTEM_LOG_WARNING,
 978                   "Connection has not authenticated soon enough, closing it "
 979                   "(auth_timeout=%dms, elapsed: %.0fms)",
 980                   auth_timeout, elapsed);
 981
 982               _dbus_verbose ("Timing out authentication for connection %p\n", connection);
 983               dbus_connection_close (connection);
 984             }
 985           else
 986             {
 987               /* We can end the loop, since the connections are in oldest-first order */
 988               next_interval = ((double)auth_timeout) - elapsed;
 989               _dbus_verbose ("Connection %p authentication expires in %d milliseconds\n",
 990                              connection, next_interval);
 991
 992               break;
 993             }
 994
 995           link = next;
 996         }
 997     }
 998
 999   bus_expire_timeout_set_interval (connections->expire_timeout,
1000                                    next_interval);
1001 }
1002
1003 static dbus_bool_t
1004 expire_incomplete_timeout (void *data)
1005 {
1006   BusConnections *connections = data;
1007
1008   _dbus_verbose ("Running\n");
1009
1010   /* note that this may remove the timeout */
1011   bus_connections_expire_incomplete (connections);
1012
1013   return TRUE;
1014 }
1015
1016 dbus_bool_t
1017 bus_connection_get_unix_groups  (DBusConnection   *connection,
1018                                  unsigned long   **groups,
1019                                  int              *n_groups,
1020                                  DBusError        *error)
1021 {
1022   unsigned long uid;
1023
1024   *groups = NULL;
1025   *n_groups = 0;
1026
1027   if (dbus_connection_get_unix_user (connection, &uid))
1028     {
1029       if (!_dbus_unix_groups_from_uid (uid, groups, n_groups))
1030         {
1031           _dbus_verbose ("Did not get any groups for UID %lu\n",
1032                          uid);
1033           return FALSE;
1034         }
1035       else
1036         {
1037           _dbus_verbose ("Got %d groups for UID %lu\n",
1038                          *n_groups, uid);
1039           return TRUE;
1040         }
1041     }
1042   else
1043     return TRUE; /* successfully got 0 groups */
1044 }
1045
1046 dbus_bool_t
1047 bus_connection_is_in_unix_group (DBusConnection *connection,
1048                                  unsigned long   gid)
1049 {
1050   int i;
1051   unsigned long *group_ids;
1052   int n_group_ids;
1053
1054   if (!bus_connection_get_unix_groups (connection, &group_ids, &n_group_ids,
1055                                        NULL))
1056     return FALSE;
1057
1058   i = 0;
1059   while (i < n_group_ids)
1060     {
1061       if (group_ids[i] == gid)
1062         {
1063           dbus_free (group_ids);
1064           return TRUE;
1065         }
1066       ++i;
1067     }
1068
1069   dbus_free (group_ids);
1070   return FALSE;
1071 }
1072
1073 const char *
1074 bus_connection_get_loginfo (DBusConnection        *connection)
1075 {
1076   BusConnectionData *d;
1077
1078   d = BUS_CONNECTION_DATA (connection);
1079   _dbus_assert(d != NULL);
1080
1081   if (!bus_connection_is_active (connection))
1082     return "inactive";
1083   return d->cached_loginfo_string;
1084 }
1085
1086 BusClientPolicy*
1087 bus_connection_get_policy (DBusConnection *connection)
1088 {
1089   BusConnectionData *d;
1090
1091   d = BUS_CONNECTION_DATA (connection);
1092
1093   _dbus_assert (d != NULL);
1094   _dbus_assert (d->policy != NULL);
1095
1096   return d->policy;
1097 }
1098
1099 #ifdef DBUS_ENABLE_CYNARA
1100 const char *bus_connection_get_cynara_session_id (DBusConnection *connection)
1101 {
1102   BusConnectionData *d = BUS_CONNECTION_DATA (connection);
1103   _dbus_assert (d != NULL);
1104
1105   if (d->cynara_session_id == NULL)
1106     {
1107       unsigned long pid;
1108       if (dbus_connection_get_unix_process_id(connection, &pid))
1109         d->cynara_session_id = cynara_session_from_pid(pid);
1110
1111       /* If client exits as soon as async call, cynara_session_from_pid() returns null.
1112          cynara_session_from_pid checks /proc/pid to verify process */
1113       if (d->cynara_session_id == NULL)
1114         asprintf (&d->cynara_session_id, "/proc/%ld", pid);
1115     }
1116   return d->cynara_session_id;
1117 }
1118 #endif
1119
1120 static dbus_bool_t
1121 foreach_active (BusConnections               *connections,
1122                 BusConnectionForeachFunction  function,
1123                 void                         *data)
1124 {
1125   DBusList *link;
1126
1127   link = _dbus_list_get_first_link (&connections->completed);
1128   while (link != NULL)
1129     {
1130       DBusConnection *connection = link->data;
1131       DBusList *next = _dbus_list_get_next_link (&connections->completed, link);
1132
1133       if (!(* function) (connection, data))
1134         return FALSE;
1135
1136       link = next;
1137     }
1138
1139   return TRUE;
1140 }
1141
1142 static dbus_bool_t
1143 foreach_inactive (BusConnections               *connections,
1144                   BusConnectionForeachFunction  function,
1145                   void                         *data)
1146 {
1147   DBusList *link;
1148
1149   link = _dbus_list_get_first_link (&connections->incomplete);
1150   while (link != NULL)
1151     {
1152       DBusConnection *connection = link->data;
1153       DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link);
1154
1155       if (!(* function) (connection, data))
1156         return FALSE;
1157
1158       link = next;
1159     }
1160
1161   return TRUE;
1162 }
1163
1164 /**
1165  * Calls function on each active connection; if the function returns
1166  * #FALSE, stops iterating. Active connections are authenticated
1167  * and have sent a Hello message.
1168  *
1169  * @param connections the connections object
1170  * @param function the function
1171  * @param data data to pass to it as a second arg
1172  */
1173 void
1174 bus_connections_foreach_active (BusConnections               *connections,
1175                                 BusConnectionForeachFunction  function,
1176                                 void                         *data)
1177 {
1178   foreach_active (connections, function, data);
1179 }
1180
1181 /**
1182  * Calls function on each connection; if the function returns
1183  * #FALSE, stops iterating.
1184  *
1185  * @param connections the connections object
1186  * @param function the function
1187  * @param data data to pass to it as a second arg
1188  */
1189 void
1190 bus_connections_foreach (BusConnections               *connections,
1191                          BusConnectionForeachFunction  function,
1192                          void                         *data)
1193 {
1194   if (!foreach_active (connections, function, data))
1195     return;
1196
1197   foreach_inactive (connections, function, data);
1198 }
1199
1200 BusContext*
1201 bus_connections_get_context (BusConnections *connections)
1202 {
1203   return connections->context;
1204 }
1205
1206 /*
1207  * This is used to avoid covering the same connection twice when
1208  * traversing connections. Note that it assumes we will
1209  * bus_connection_mark_stamp() each connection at least once per
1210  * INT_MAX increments of the global stamp, or wraparound would break
1211  * things.
1212  */
1213 void
1214 bus_connections_increment_stamp (BusConnections *connections)
1215 {
1216   connections->stamp += 1;
1217 }
1218
1219 /* Mark connection with current stamp, return TRUE if it
1220  * didn't already have that stamp
1221  */
1222 dbus_bool_t
1223 bus_connection_mark_stamp (DBusConnection *connection)
1224 {
1225   BusConnectionData *d;
1226
1227   d = BUS_CONNECTION_DATA (connection);
1228
1229   _dbus_assert (d != NULL);
1230
1231   if (d->stamp == d->connections->stamp)
1232     return FALSE;
1233   else
1234     {
1235       d->stamp = d->connections->stamp;
1236       return TRUE;
1237     }
1238 }
1239
1240 BusContext*
1241 bus_connection_get_context (DBusConnection *connection)
1242 {
1243   BusConnectionData *d;
1244
1245   d = BUS_CONNECTION_DATA (connection);
1246
1247   _dbus_assert (d != NULL);
1248
1249   return d->connections->context;
1250 }
1251
1252 BusConnections*
1253 bus_connection_get_connections (DBusConnection *connection)
1254 {
1255   BusConnectionData *d;
1256
1257   d = BUS_CONNECTION_DATA (connection);
1258
1259   _dbus_assert (d != NULL);
1260
1261   return d->connections;
1262 }
1263
1264 BusRegistry*
1265 bus_connection_get_registry (DBusConnection *connection)
1266 {
1267   BusConnectionData *d;
1268
1269   d = BUS_CONNECTION_DATA (connection);
1270
1271   _dbus_assert (d != NULL);
1272
1273   return bus_context_get_registry (d->connections->context);
1274 }
1275
1276 BusActivation*
1277 bus_connection_get_activation (DBusConnection *connection)
1278 {
1279   BusConnectionData *d;
1280
1281   d = BUS_CONNECTION_DATA (connection);
1282
1283   _dbus_assert (d != NULL);
1284
1285   return bus_context_get_activation (d->connections->context);
1286 }
1287
1288 BusMatchmaker*
1289 bus_connection_get_matchmaker (DBusConnection *connection)
1290 {
1291   BusConnectionData *d;
1292
1293   d = BUS_CONNECTION_DATA (connection);
1294
1295   _dbus_assert (d != NULL);
1296
1297   return bus_context_get_matchmaker (d->connections->context);
1298 }
1299
1300 BusSELinuxID*
1301 bus_connection_get_selinux_id (DBusConnection *connection)
1302 {
1303   BusConnectionData *d;
1304
1305   d = BUS_CONNECTION_DATA (connection);
1306
1307   _dbus_assert (d != NULL);
1308
1309   return d->selinux_id;
1310 }
1311
1312 BusAppArmorConfinement*
1313 bus_connection_dup_apparmor_confinement (DBusConnection *connection)
1314 {
1315   BusConnectionData *d;
1316
1317   d = BUS_CONNECTION_DATA (connection);
1318
1319   _dbus_assert (d != NULL);
1320
1321   bus_apparmor_confinement_ref (d->apparmor_confinement);
1322   return d->apparmor_confinement;
1323 }
1324
1325 /**
1326  * Checks whether the connection is registered with the message bus.
1327  *
1328  * @param connection the connection
1329  * @returns #TRUE if we're an active message bus participant
1330  */
1331 dbus_bool_t
1332 bus_connection_is_active (DBusConnection *connection)
1333 {
1334   BusConnectionData *d;
1335
1336   d = BUS_CONNECTION_DATA (connection);
1337   _dbus_assert(d != NULL);
1338
1339   return d->name != NULL;
1340 }
1341
1342 dbus_bool_t
1343 bus_connection_preallocate_oom_error (DBusConnection *connection)
1344 {
1345   DBusMessage *message;
1346   DBusPreallocatedSend *preallocated;
1347   BusConnectionData *d;
1348
1349   d = BUS_CONNECTION_DATA (connection);
1350
1351   _dbus_assert (d != NULL);
1352
1353   if (d->oom_preallocated != NULL)
1354     return TRUE;
1355
1356   preallocated = dbus_connection_preallocate_send (connection);
1357   if (preallocated == NULL)
1358     return FALSE;
1359
1360   message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1361
1362   if (message == NULL)
1363     {
1364       dbus_connection_free_preallocated_send (connection, preallocated);
1365       return FALSE;
1366     }
1367
1368   /* d->name may be NULL, but that is OK */
1369   if (!dbus_message_set_error_name (message, DBUS_ERROR_NO_MEMORY) ||
1370       !dbus_message_set_destination (message, d->name) ||
1371       !dbus_message_set_sender (message,
1372                                 DBUS_SERVICE_DBUS))
1373     {
1374       dbus_connection_free_preallocated_send (connection, preallocated);
1375       dbus_message_unref (message);
1376       return FALSE;
1377     }
1378
1379   /* set reply serial to placeholder value just so space is already allocated
1380    * for it.
1381    */
1382   if (!dbus_message_set_reply_serial (message, 14))
1383     {
1384       dbus_connection_free_preallocated_send (connection, preallocated);
1385       dbus_message_unref (message);
1386       return FALSE;
1387     }
1388
1389   d->oom_message = message;
1390   d->oom_preallocated = preallocated;
1391
1392   return TRUE;
1393 }
1394
1395 void
1396 bus_connection_send_oom_error (DBusConnection *connection,
1397                                DBusMessage    *in_reply_to)
1398 {
1399   BusConnectionData *d;
1400
1401   d = BUS_CONNECTION_DATA (connection);
1402
1403   _dbus_assert (d != NULL);
1404   _dbus_assert (d->oom_message != NULL);
1405
1406   bus_context_log (d->connections->context, DBUS_SYSTEM_LOG_WARNING,
1407                    "dbus-daemon transaction failed (OOM), sending error to "
1408                    "sender %s", bus_connection_get_loginfo (connection));
1409
1410   /* should always succeed since we set it to a placeholder earlier */
1411   if (!dbus_message_set_reply_serial (d->oom_message,
1412                                       dbus_message_get_serial (in_reply_to)))
1413     _dbus_assert_not_reached ("Failed to set reply serial for preallocated oom message");
1414
1415   _dbus_assert (dbus_message_get_sender (d->oom_message) != NULL);
1416
1417   dbus_connection_send_preallocated (connection, d->oom_preallocated,
1418                                      d->oom_message, NULL);
1419
1420   dbus_message_unref (d->oom_message);
1421   d->oom_message = NULL;
1422   d->oom_preallocated = NULL;
1423 }
1424
1425 #ifdef DBUS_ENABLE_STATS
1426 static void
1427 update_peak (int *peak,
1428              int n)
1429 {
1430   if (*peak < n)
1431     *peak = n;
1432 }
1433 #endif
1434
1435 void
1436 bus_connection_add_match_rule_link (DBusConnection *connection,
1437                                     DBusList       *link)
1438 {
1439   BusConnectionData *d;
1440
1441   d = BUS_CONNECTION_DATA (connection);
1442   _dbus_assert (d != NULL);
1443
1444   _dbus_list_append_link (&d->match_rules, link);
1445
1446   d->n_match_rules += 1;
1447
1448 #ifdef DBUS_ENABLE_STATS
1449   update_peak (&d->peak_match_rules, d->n_match_rules);
1450   update_peak (&d->connections->peak_match_rules_per_conn, d->n_match_rules);
1451
1452   d->connections->total_match_rules += 1;
1453   update_peak (&d->connections->peak_match_rules,
1454                d->connections->total_match_rules);
1455 #endif
1456 }
1457
1458 dbus_bool_t
1459 bus_connection_add_match_rule (DBusConnection *connection,
1460                                BusMatchRule   *rule)
1461 {
1462     DBusList *link;
1463
1464   link = _dbus_list_alloc_link (rule);
1465
1466   if (link == NULL)
1467     return FALSE;
1468
1469   bus_connection_add_match_rule_link (connection, link);
1470
1471   return TRUE;
1472 }
1473
1474 void
1475 bus_connection_remove_match_rule (DBusConnection *connection,
1476                                   BusMatchRule   *rule)
1477 {
1478   BusConnectionData *d;
1479
1480   d = BUS_CONNECTION_DATA (connection);
1481   _dbus_assert (d != NULL);
1482
1483   _dbus_list_remove_last (&d->match_rules, rule);
1484
1485   d->n_match_rules -= 1;
1486   _dbus_assert (d->n_match_rules >= 0);
1487
1488 #ifdef DBUS_ENABLE_STATS
1489   d->connections->total_match_rules -= 1;
1490 #endif
1491 }
1492
1493 int
1494 bus_connection_get_n_match_rules (DBusConnection *connection)
1495 {
1496   BusConnectionData *d;
1497
1498   d = BUS_CONNECTION_DATA (connection);
1499   _dbus_assert (d != NULL);
1500
1501   return d->n_match_rules;
1502 }
1503
1504 dbus_bool_t
1505 bus_connection_is_service_owner_by_prefix (DBusConnection *connection,
1506                                            const char *name_prefix)
1507 {
1508   BusConnectionData *d;
1509   DBusList *link;
1510
1511   d = BUS_CONNECTION_DATA (connection);
1512   _dbus_assert (d != NULL);
1513
1514   link = _dbus_list_get_first_link (&d->services_owned);
1515   while (link != NULL)
1516     {
1517       BusService *service = link->data;
1518       DBusString str;
1519
1520       _dbus_string_init_const (&str, bus_service_get_name (service));
1521
1522       if (_dbus_string_starts_with_words_c_str (&str, name_prefix, '.'))
1523         return TRUE;
1524
1525       link = _dbus_list_get_next_link (&d->services_owned, link);
1526     }
1527
1528   return FALSE;
1529 }
1530
1531 void
1532 bus_connection_add_owned_service_link (DBusConnection *connection,
1533                                        DBusList       *link)
1534 {
1535   BusConnectionData *d;
1536
1537   d = BUS_CONNECTION_DATA (connection);
1538   _dbus_assert (d != NULL);
1539
1540   _dbus_list_append_link (&d->services_owned, link);
1541
1542   d->n_services_owned += 1;
1543
1544 #ifdef DBUS_ENABLE_STATS
1545   update_peak (&d->peak_bus_names, d->n_services_owned);
1546   update_peak (&d->connections->peak_bus_names_per_conn,
1547                d->n_services_owned);
1548
1549   d->connections->total_bus_names += 1;
1550   update_peak (&d->connections->peak_bus_names,
1551                d->connections->total_bus_names);
1552 #endif
1553 }
1554
1555 dbus_bool_t
1556 bus_connection_add_owned_service (DBusConnection *connection,
1557                                   BusService     *service)
1558 {
1559   DBusList *link;
1560
1561   link = _dbus_list_alloc_link (service);
1562
1563   if (link == NULL)
1564     return FALSE;
1565
1566   bus_connection_add_owned_service_link (connection, link);
1567
1568   return TRUE;
1569 }
1570
1571 void
1572 bus_connection_remove_owned_service (DBusConnection *connection,
1573                                      BusService     *service)
1574 {
1575   BusConnectionData *d;
1576
1577   d = BUS_CONNECTION_DATA (connection);
1578   _dbus_assert (d != NULL);
1579
1580   _dbus_list_remove_last (&d->services_owned, service);
1581
1582   d->n_services_owned -= 1;
1583   _dbus_assert (d->n_services_owned >= 0);
1584
1585 #ifdef DBUS_ENABLE_STATS
1586   d->connections->total_bus_names -= 1;
1587 #endif
1588 }
1589
1590 int
1591 bus_connection_get_n_services_owned (DBusConnection *connection)
1592 {
1593   BusConnectionData *d;
1594
1595   d = BUS_CONNECTION_DATA (connection);
1596   _dbus_assert (d != NULL);
1597
1598   return d->n_services_owned;
1599 }
1600
1601 dbus_bool_t
1602 bus_connection_complete (DBusConnection   *connection,
1603                          const DBusString *name,
1604                          DBusError        *error)
1605 {
1606   BusConnectionData *d;
1607   unsigned long uid;
1608
1609   d = BUS_CONNECTION_DATA (connection);
1610   _dbus_assert (d != NULL);
1611   _dbus_assert (d->name == NULL);
1612   _dbus_assert (d->policy == NULL);
1613
1614   _dbus_assert (!bus_connection_is_active (connection));
1615
1616   if (!_dbus_string_copy_data (name, &d->name))
1617     {
1618       BUS_SET_OOM (error);
1619       return FALSE;
1620     }
1621
1622   _dbus_assert (d->name != NULL);
1623
1624   _dbus_verbose ("Name %s assigned to %p\n", d->name, connection);
1625
1626   d->policy = bus_context_create_client_policy (d->connections->context,
1627                                                 connection,
1628                                                 error);
1629
1630   /* we may have a NULL policy on OOM or error getting list of
1631    * groups for a user. In the latter case we don't handle it so
1632    * well currently, as it will just keep failing over and over.
1633    */
1634
1635   if (d->policy == NULL)
1636     {
1637       _dbus_verbose ("Failed to create security policy for connection %p\n",
1638                      connection);
1639       _DBUS_ASSERT_ERROR_IS_SET (error);
1640       dbus_free (d->name);
1641       d->name = NULL;
1642       return FALSE;
1643     }
1644
1645   if (dbus_connection_get_unix_user (connection, &uid))
1646     {
1647       if (!adjust_connections_for_uid (d->connections,
1648                                        uid, 1))
1649         goto fail;
1650     }
1651
1652   /* Create and cache a string which holds information about the
1653    * peer process; used for logging purposes.
1654    */
1655   if (!cache_peer_loginfo_string (d, connection))
1656     goto fail;
1657
1658   /* Now the connection is active, move it between lists */
1659   _dbus_list_unlink (&d->connections->incomplete,
1660                      d->link_in_connection_list);
1661   d->connections->n_incomplete -= 1;
1662   _dbus_list_append_link (&d->connections->completed,
1663                           d->link_in_connection_list);
1664   d->connections->n_completed += 1;
1665
1666   _dbus_assert (d->connections->n_incomplete >= 0);
1667   _dbus_assert (d->connections->n_completed > 0);
1668
1669   /* If we have dropped below the max. number of incomplete
1670    * connections, start accept()ing again */
1671   bus_context_check_all_watches (d->connections->context);
1672
1673   /* See if we can remove the timeout */
1674   bus_connections_expire_incomplete (d->connections);
1675
1676   _dbus_assert (bus_connection_is_active (connection));
1677
1678   return TRUE;
1679 fail:
1680   BUS_SET_OOM (error);
1681   dbus_free (d->name);
1682   d->name = NULL;
1683   if (d->policy)
1684     bus_client_policy_unref (d->policy);
1685   d->policy = NULL;
1686   return FALSE;
1687 }
1688
1689 dbus_bool_t
1690 bus_connections_reload_policy (BusConnections *connections,
1691                                DBusError      *error)
1692 {
1693   BusConnectionData *d;
1694   DBusConnection *connection;
1695   DBusList *link;
1696
1697   _dbus_assert (connections != NULL);
1698   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1699
1700   for (link = _dbus_list_get_first_link (&(connections->completed));
1701        link;
1702        link = _dbus_list_get_next_link (&(connections->completed), link))
1703     {
1704       connection = link->data;
1705       d = BUS_CONNECTION_DATA (connection);
1706       _dbus_assert (d != NULL);
1707       _dbus_assert (d->policy != NULL);
1708
1709       bus_client_policy_unref (d->policy);
1710       d->policy = bus_context_create_client_policy (connections->context,
1711                                                     connection,
1712                                                     error);
1713       if (d->policy == NULL)
1714         {
1715           _dbus_verbose ("Failed to create security policy for connection %p\n",
1716                       connection);
1717           _DBUS_ASSERT_ERROR_IS_SET (error);
1718           return FALSE;
1719         }
1720     }
1721
1722   return TRUE;
1723 }
1724
1725 const char *
1726 bus_connection_get_name (DBusConnection *connection)
1727 {
1728   BusConnectionData *d;
1729
1730   d = BUS_CONNECTION_DATA (connection);
1731   _dbus_assert (d != NULL);
1732
1733   return d->name;
1734 }
1735
1736 /**
1737  * Check whether completing the passed-in connection would
1738  * exceed limits, and if so set error and return #FALSE
1739  */
1740 dbus_bool_t
1741 bus_connections_check_limits (BusConnections  *connections,
1742                               DBusConnection  *requesting_completion,
1743                               const char     **limit_name_out,
1744                               int             *limit_out,
1745                               DBusError       *error)
1746 {
1747   unsigned long uid;
1748   int limit;
1749
1750   limit = bus_context_get_max_completed_connections (connections->context);
1751
1752   if (connections->n_completed >= limit)
1753     {
1754       if (limit_name_out != NULL)
1755         *limit_name_out = "max_completed_connections";
1756
1757       if (limit_out != NULL)
1758         *limit_out = limit;
1759
1760       dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1761                       "The maximum number of active connections has been reached");
1762       return FALSE;
1763     }
1764
1765   if (dbus_connection_get_unix_user (requesting_completion, &uid))
1766     {
1767       limit = bus_context_get_max_connections_per_user (connections->context);
1768
1769       if (get_connections_for_uid (connections, uid) >= limit)
1770         {
1771           if (limit_name_out != NULL)
1772             *limit_name_out = "max_connections_per_user";
1773
1774           if (limit_out != NULL)
1775             *limit_out = limit;
1776
1777           dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
1778                           "The maximum number of active connections for UID %lu has been reached",
1779                           uid);
1780           return FALSE;
1781         }
1782     }
1783
1784   return TRUE;
1785 }
1786
1787 static void
1788 bus_pending_reply_free (BusPendingReply *pending)
1789 {
1790   _dbus_verbose ("Freeing pending reply %p, replier %p receiver %p serial %u\n",
1791                  pending,
1792                  pending->will_send_reply,
1793                  pending->will_get_reply,
1794                  pending->reply_serial);
1795
1796   dbus_free (pending);
1797 }
1798
1799 static dbus_bool_t
1800 bus_pending_reply_send_no_reply (BusConnections  *connections,
1801                                  BusTransaction  *transaction,
1802                                  BusPendingReply *pending)
1803 {
1804   DBusMessage *message;
1805   DBusMessageIter iter;
1806   dbus_bool_t retval;
1807   const char *errmsg;
1808
1809   retval = FALSE;
1810
1811   message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
1812   if (message == NULL)
1813     return FALSE;
1814
1815   dbus_message_set_no_reply (message, TRUE);
1816
1817   if (!dbus_message_set_reply_serial (message,
1818                                       pending->reply_serial))
1819     goto out;
1820
1821   if (!dbus_message_set_error_name (message,
1822                                     DBUS_ERROR_NO_REPLY))
1823     goto out;
1824
1825   /* If you change these messages, adjust test/dbus-daemon.c to match */
1826   if (pending->will_send_reply == NULL)
1827     errmsg = "Message recipient disconnected from message bus without replying";
1828   else
1829     errmsg = "Message did not receive a reply (timeout by message bus)";
1830
1831   dbus_message_iter_init_append (message, &iter);
1832   if (!dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &errmsg))
1833     goto out;
1834
1835   if (!bus_transaction_send_from_driver (transaction, pending->will_get_reply,
1836                                          message))
1837     goto out;
1838
1839   retval = TRUE;
1840
1841  out:
1842   dbus_message_unref (message);
1843   return retval;
1844 }
1845
1846 static dbus_bool_t
1847 bus_pending_reply_expired (BusExpireList *list,
1848                            DBusList      *link,
1849                            void          *data)
1850 {
1851   BusPendingReply *pending = link->data;
1852   BusConnections *connections = data;
1853   BusTransaction *transaction;
1854
1855   /* No reply is forthcoming. So nuke it if we can. If not,
1856    * leave it in the list to try expiring again later when we
1857    * get more memory.
1858    */
1859
1860   _dbus_verbose ("Expiring pending reply %p, replier %p receiver %p serial %u\n",
1861                  pending,
1862                  pending->will_send_reply,
1863                  pending->will_get_reply,
1864                  pending->reply_serial);
1865
1866   transaction = bus_transaction_new (connections->context);
1867   if (transaction == NULL)
1868     return FALSE;
1869
1870   if (!bus_pending_reply_send_no_reply (connections,
1871                                         transaction,
1872                                         pending))
1873     {
1874       bus_transaction_cancel_and_free (transaction);
1875       return FALSE;
1876     }
1877
1878   bus_expire_list_remove_link (connections->pending_replies, link);
1879
1880   bus_pending_reply_free (pending);
1881   bus_transaction_execute_and_free (transaction);
1882
1883   return TRUE;
1884 }
1885
1886 static void
1887 bus_connection_drop_pending_replies (BusConnections  *connections,
1888                                      DBusConnection  *connection)
1889 {
1890   /* The DBusConnection is almost 100% finalized here, so you can't
1891    * do anything with it except check for pointer equality
1892    */
1893   DBusList *link;
1894
1895   _dbus_verbose ("Dropping pending replies that involve connection %p\n",
1896                  connection);
1897
1898   link = bus_expire_list_get_first_link (connections->pending_replies);
1899   while (link != NULL)
1900     {
1901       DBusList *next;
1902       BusPendingReply *pending;
1903
1904       next = bus_expire_list_get_next_link (connections->pending_replies,
1905                                             link);
1906       pending = link->data;
1907
1908       if (pending->will_get_reply == connection)
1909         {
1910           /* We don't need to track this pending reply anymore */
1911
1912           _dbus_verbose ("Dropping pending reply %p, replier %p receiver %p serial %u\n",
1913                          pending,
1914                          pending->will_send_reply,
1915                          pending->will_get_reply,
1916                          pending->reply_serial);
1917
1918           bus_expire_list_remove_link (connections->pending_replies,
1919                                        link);
1920           bus_pending_reply_free (pending);
1921         }
1922       else if (pending->will_send_reply == connection)
1923         {
1924           /* The reply isn't going to be sent, so set things
1925            * up so it will be expired right away
1926            */
1927           _dbus_verbose ("Will expire pending reply %p, replier %p receiver %p serial %u\n",
1928                          pending,
1929                          pending->will_send_reply,
1930                          pending->will_get_reply,
1931                          pending->reply_serial);
1932
1933           pending->will_send_reply = NULL;
1934           pending->expire_item.added_tv_sec = 0;
1935           pending->expire_item.added_tv_usec = 0;
1936
1937           bus_expire_list_recheck_immediately (connections->pending_replies);
1938         }
1939
1940       link = next;
1941     }
1942 }
1943
1944
1945 typedef struct
1946 {
1947   BusPendingReply *pending;
1948   BusConnections  *connections;
1949 } CancelPendingReplyData;
1950
1951 static void
1952 cancel_pending_reply (void *data)
1953 {
1954   CancelPendingReplyData *d = data;
1955
1956   _dbus_verbose ("d = %p\n", d);
1957
1958   if (!bus_expire_list_remove (d->connections->pending_replies,
1959                                &d->pending->expire_item))
1960     _dbus_assert_not_reached ("pending reply did not exist to be cancelled");
1961
1962   bus_pending_reply_free (d->pending); /* since it's been cancelled */
1963 }
1964
1965 static void
1966 cancel_pending_reply_data_free (void *data)
1967 {
1968   CancelPendingReplyData *d = data;
1969
1970   _dbus_verbose ("d = %p\n", d);
1971
1972   /* d->pending should be either freed or still
1973    * in the list of pending replies (owned by someone
1974    * else)
1975    */
1976
1977   dbus_free (d);
1978 }
1979
1980 /*
1981  * Record that a reply is allowed; return TRUE on success.
1982  */
1983 dbus_bool_t
1984 bus_connections_expect_reply (BusConnections  *connections,
1985                               BusTransaction  *transaction,
1986                               DBusConnection  *will_get_reply,
1987                               DBusConnection  *will_send_reply,
1988                               DBusMessage     *reply_to_this,
1989                               DBusError       *error)
1990 {
1991   BusPendingReply *pending;
1992   dbus_uint32_t reply_serial;
1993   DBusList *link;
1994   CancelPendingReplyData *cprd;
1995   int count;
1996   int limit;
1997
1998   _dbus_assert (will_get_reply != NULL);
1999   _dbus_assert (will_send_reply != NULL);
2000   _dbus_assert (reply_to_this != NULL);
2001
2002   if (dbus_message_get_no_reply (reply_to_this))
2003     return TRUE; /* we won't allow a reply, since client doesn't care for one. */
2004
2005   reply_serial = dbus_message_get_serial (reply_to_this);
2006
2007   link = bus_expire_list_get_first_link (connections->pending_replies);
2008   count = 0;
2009   while (link != NULL)
2010     {
2011       pending = link->data;
2012
2013       if (pending->reply_serial == reply_serial &&
2014           pending->will_get_reply == will_get_reply &&
2015           pending->will_send_reply == will_send_reply)
2016         {
2017           dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
2018                           "Message has the same reply serial as a currently-outstanding existing method call");
2019           return FALSE;
2020         }
2021
2022       link = bus_expire_list_get_next_link (connections->pending_replies,
2023                                             link);
2024       if (pending->will_get_reply == will_get_reply)
2025         ++count;
2026     }
2027
2028   limit = bus_context_get_max_replies_per_connection (connections->context);
2029
2030   if (count >= limit)
2031     {
2032       bus_context_log (connections->context, DBUS_SYSTEM_LOG_WARNING,
2033                        "The maximum number of pending replies for "
2034                        "\"%s\" (%s) has been reached "
2035                        "(max_replies_per_connection=%d)",
2036                        bus_connection_get_name (will_get_reply),
2037                        bus_connection_get_loginfo (will_get_reply),
2038                        limit);
2039
2040       dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
2041                       "The maximum number of pending replies per connection has been reached");
2042       return FALSE;
2043     }
2044
2045 #ifdef DBUS_ENABLE_STATS
2046   {
2047     BusConnectionData *d;
2048
2049     d = BUS_CONNECTION_DATA (will_get_reply);
2050     _dbus_assert (d != NULL);
2051
2052     update_peak(&d->peak_pending_replies, count);
2053   }
2054 #endif
2055
2056   pending = dbus_new0 (BusPendingReply, 1);
2057   if (pending == NULL)
2058     {
2059       BUS_SET_OOM (error);
2060       return FALSE;
2061     }
2062
2063 #ifdef DBUS_ENABLE_VERBOSE_MODE
2064   /* so we can see a not-yet-added pending reply */
2065   pending->expire_item.added_tv_sec = 1;
2066   pending->expire_item.added_tv_usec = 1;
2067 #endif
2068
2069   pending->will_get_reply = will_get_reply;
2070   pending->will_send_reply = will_send_reply;
2071   pending->reply_serial = reply_serial;
2072
2073   cprd = dbus_new0 (CancelPendingReplyData, 1);
2074   if (cprd == NULL)
2075     {
2076       BUS_SET_OOM (error);
2077       bus_pending_reply_free (pending);
2078       return FALSE;
2079     }
2080
2081   if (!bus_expire_list_add (connections->pending_replies,
2082                             &pending->expire_item))
2083     {
2084       BUS_SET_OOM (error);
2085       dbus_free (cprd);
2086       bus_pending_reply_free (pending);
2087       return FALSE;
2088     }
2089
2090   if (!bus_transaction_add_cancel_hook (transaction,
2091                                         cancel_pending_reply,
2092                                         cprd,
2093                                         cancel_pending_reply_data_free))
2094     {
2095       BUS_SET_OOM (error);
2096       bus_expire_list_remove (connections->pending_replies, &pending->expire_item);
2097       dbus_free (cprd);
2098       bus_pending_reply_free (pending);
2099       return FALSE;
2100     }
2101
2102   cprd->pending = pending;
2103   cprd->connections = connections;
2104
2105   _dbus_get_monotonic_time (&pending->expire_item.added_tv_sec,
2106                             &pending->expire_item.added_tv_usec);
2107
2108   _dbus_verbose ("Added pending reply %p, replier %p receiver %p serial %u\n",
2109                  pending,
2110                  pending->will_send_reply,
2111                  pending->will_get_reply,
2112                  pending->reply_serial);
2113
2114   return TRUE;
2115 }
2116
2117 typedef struct
2118 {
2119   DBusList        *link;
2120   BusConnections  *connections;
2121 } CheckPendingReplyData;
2122
2123 static void
2124 cancel_check_pending_reply (void *data)
2125 {
2126   CheckPendingReplyData *d = data;
2127
2128   _dbus_verbose ("d = %p\n",d);
2129
2130   bus_expire_list_add_link (d->connections->pending_replies,
2131                             d->link);
2132   d->link = NULL;
2133 }
2134
2135 static void
2136 check_pending_reply_data_free (void *data)
2137 {
2138   CheckPendingReplyData *d = data;
2139
2140   _dbus_verbose ("d = %p\n",d);
2141
2142   if (d->link != NULL)
2143     {
2144       BusPendingReply *pending = d->link->data;
2145
2146       _dbus_assert (!bus_expire_list_contains_item (d->connections->pending_replies,
2147                                                     &pending->expire_item));
2148
2149       bus_pending_reply_free (pending);
2150       _dbus_list_free_link (d->link);
2151     }
2152
2153   dbus_free (d);
2154 }
2155
2156 /*
2157  * Check whether a reply is allowed, remove BusPendingReply
2158  * if so, return TRUE if so.
2159  */
2160 dbus_bool_t
2161 bus_connections_check_reply (BusConnections *connections,
2162                              BusTransaction *transaction,
2163                              DBusConnection *sending_reply,
2164                              DBusConnection *receiving_reply,
2165                              DBusMessage    *reply,
2166                              DBusError      *error)
2167 {
2168   CheckPendingReplyData *cprd;
2169   DBusList *link;
2170   dbus_uint32_t reply_serial;
2171
2172   _dbus_assert (sending_reply != NULL);
2173   _dbus_assert (receiving_reply != NULL);
2174
2175   reply_serial = dbus_message_get_reply_serial (reply);
2176
2177   link = bus_expire_list_get_first_link (connections->pending_replies);
2178   while (link != NULL)
2179     {
2180       BusPendingReply *pending = link->data;
2181
2182       if (pending->reply_serial == reply_serial &&
2183           pending->will_get_reply == receiving_reply &&
2184           pending->will_send_reply == sending_reply)
2185         {
2186           _dbus_verbose ("Found pending reply with serial %u\n", reply_serial);
2187           break;
2188         }
2189
2190       link = bus_expire_list_get_next_link (connections->pending_replies,
2191                                             link);
2192     }
2193
2194   if (link == NULL)
2195     {
2196       _dbus_verbose ("No pending reply expected\n");
2197
2198       return FALSE;
2199     }
2200
2201   cprd = dbus_new0 (CheckPendingReplyData, 1);
2202   if (cprd == NULL)
2203     {
2204       BUS_SET_OOM (error);
2205       return FALSE;
2206     }
2207
2208   if (!bus_transaction_add_cancel_hook (transaction,
2209                                         cancel_check_pending_reply,
2210                                         cprd,
2211                                         check_pending_reply_data_free))
2212     {
2213       BUS_SET_OOM (error);
2214       dbus_free (cprd);
2215       return FALSE;
2216     }
2217
2218   cprd->link = link;
2219   cprd->connections = connections;
2220
2221   bus_expire_list_unlink (connections->pending_replies,
2222                           link);
2223
2224   _dbus_assert (!bus_expire_list_contains_item (connections->pending_replies, link->data));
2225
2226   return TRUE;
2227 }
2228
2229 /*
2230  * Transactions
2231  *
2232  * Note that this is fairly fragile; in particular, don't try to use
2233  * one transaction across any main loop iterations.
2234  */
2235
2236 typedef struct
2237 {
2238   BusTransaction *transaction;
2239   DBusMessage    *message;
2240   DBusPreallocatedSend *preallocated;
2241 } MessageToSend;
2242
2243 typedef struct
2244 {
2245   BusTransactionCancelFunction cancel_function;
2246   DBusFreeFunction free_data_function;
2247   void *data;
2248 } CancelHook;
2249
2250 struct BusTransaction
2251 {
2252   DBusList *connections;
2253   BusContext *context;
2254   DBusList *cancel_hooks;
2255 };
2256
2257 static void
2258 message_to_send_free (DBusConnection *connection,
2259                       MessageToSend  *to_send)
2260 {
2261   if (to_send->message)
2262     dbus_message_unref (to_send->message);
2263
2264   if (to_send->preallocated)
2265     dbus_connection_free_preallocated_send (connection, to_send->preallocated);
2266
2267   dbus_free (to_send);
2268 }
2269
2270 static void
2271 cancel_hook_cancel (void *element,
2272                     void *data)
2273 {
2274   CancelHook *ch = element;
2275
2276   _dbus_verbose ("Running transaction cancel hook\n");
2277
2278   if (ch->cancel_function)
2279     (* ch->cancel_function) (ch->data);
2280 }
2281
2282 static void
2283 cancel_hook_free (void *element,
2284                   void *data)
2285 {
2286   CancelHook *ch = element;
2287
2288   if (ch->free_data_function)
2289     (* ch->free_data_function) (ch->data);
2290
2291   dbus_free (ch);
2292 }
2293
2294 static void
2295 free_cancel_hooks (BusTransaction *transaction)
2296 {
2297   _dbus_list_foreach (&transaction->cancel_hooks,
2298                       cancel_hook_free, NULL);
2299
2300   _dbus_list_clear (&transaction->cancel_hooks);
2301 }
2302
2303 BusTransaction*
2304 bus_transaction_new (BusContext *context)
2305 {
2306   BusTransaction *transaction;
2307
2308   transaction = dbus_new0 (BusTransaction, 1);
2309   if (transaction == NULL)
2310     return NULL;
2311
2312   transaction->context = context;
2313
2314   return transaction;
2315 }
2316
2317 BusContext*
2318 bus_transaction_get_context (BusTransaction  *transaction)
2319 {
2320   return transaction->context;
2321 }
2322
2323 /**
2324  * Reserve enough memory to capture the given message if the
2325  * transaction goes through.
2326  */
2327 dbus_bool_t
2328 bus_transaction_capture (BusTransaction *transaction,
2329                          DBusConnection *sender,
2330                          DBusConnection *addressed_recipient,
2331                          DBusMessage    *message)
2332 {
2333   BusConnections *connections;
2334   BusMatchmaker *mm;
2335   DBusList *link;
2336   DBusList *recipients = NULL;
2337   dbus_bool_t ret = FALSE;
2338
2339   connections = bus_context_get_connections (transaction->context);
2340
2341   /* shortcut: don't compose the message unless someone wants it */
2342   if (connections->monitors == NULL)
2343     return TRUE;
2344
2345   mm = connections->monitor_matchmaker;
2346   /* This is non-null if there has ever been a monitor - we don't GC it.
2347    * There's little point, since there is up to 1 per process. */
2348   _dbus_assert (mm != NULL);
2349
2350   if (!bus_matchmaker_get_recipients (mm, connections, sender,
2351         addressed_recipient, message, &recipients))
2352     goto out;
2353
2354   for (link = _dbus_list_get_first_link (&recipients);
2355       link != NULL;
2356       link = _dbus_list_get_next_link (&recipients, link))
2357     {
2358       DBusConnection *recipient = link->data;
2359
2360       if (!bus_transaction_send (transaction, recipient, message, FALSE))
2361         goto out;
2362     }
2363
2364   ret = TRUE;
2365
2366 out:
2367   _dbus_list_clear (&recipients);
2368   return ret;
2369 }
2370
2371 dbus_bool_t
2372 bus_transaction_capture_error_reply (BusTransaction  *transaction,
2373                                      DBusConnection  *addressed_recipient,
2374                                      const DBusError *error,
2375                                      DBusMessage     *in_reply_to)
2376 {
2377   BusConnections *connections;
2378   DBusMessage *reply;
2379   dbus_bool_t ret = FALSE;
2380
2381   _dbus_assert (error != NULL);
2382   _DBUS_ASSERT_ERROR_IS_SET (error);
2383
2384   connections = bus_context_get_connections (transaction->context);
2385
2386   /* shortcut: don't compose the message unless someone wants it */
2387   if (connections->monitors == NULL)
2388     return TRUE;
2389
2390   reply = dbus_message_new_error (in_reply_to,
2391                                   error->name,
2392                                   error->message);
2393
2394   if (reply == NULL)
2395     return FALSE;
2396
2397   if (!dbus_message_set_sender (reply, DBUS_SERVICE_DBUS))
2398     goto out;
2399
2400   ret = bus_transaction_capture (transaction, NULL, addressed_recipient, reply);
2401
2402 out:
2403   dbus_message_unref (reply);
2404   return ret;
2405 }
2406
2407 dbus_bool_t
2408 bus_transaction_send_from_driver (BusTransaction *transaction,
2409                                   DBusConnection *connection,
2410                                   DBusMessage    *message)
2411 {
2412   DBusError error = DBUS_ERROR_INIT;
2413   BusDeferredMessage *deferred_message;
2414
2415   /* We have to set the sender to the driver, and have
2416    * to check security policy since it was not done in
2417    * dispatch.c
2418    */
2419   _dbus_verbose ("Sending %s %s %s from driver\n",
2420                  dbus_message_get_interface (message) ?
2421                  dbus_message_get_interface (message) : "(no interface)",
2422                  dbus_message_get_member (message) ?
2423                  dbus_message_get_member (message) : "(no member)",
2424                  dbus_message_get_error_name (message) ?
2425                  dbus_message_get_error_name (message) : "(no error name)");
2426
2427   if (!dbus_message_set_sender (message, DBUS_SERVICE_DBUS))
2428     return FALSE;
2429
2430   if (bus_connection_is_active (connection))
2431     {
2432       if (!dbus_message_set_destination (message,
2433                                          bus_connection_get_name (connection)))
2434         return FALSE;
2435     }
2436
2437   /* bus driver never wants a reply */
2438   dbus_message_set_no_reply (message, TRUE);
2439
2440   /* Capture it for monitors, even if the real recipient's receive policy
2441    * does not allow it to receive this message from us (which would be odd).
2442    */
2443   if (!bus_transaction_capture (transaction, NULL, connection, message))
2444     return FALSE;
2445
2446   /* If security policy doesn't allow the message, we would silently
2447    * eat it; the driver doesn't care about getting a reply. However,
2448    * if we're actively capturing messages, it's nice to log that we
2449    * tried to send it and did not allow ourselves to do so.
2450    */
2451   switch (bus_context_check_security_policy (bus_transaction_get_context (transaction),
2452                                              transaction,
2453                                              NULL, connection, connection,
2454                                              message, NULL, &error,
2455                                              &deferred_message))
2456     {
2457     case BUS_RESULT_TRUE:
2458       break;
2459     case BUS_RESULT_FALSE:
2460       if (!bus_transaction_capture_error_reply (transaction, connection,
2461                                                 &error, message))
2462         {
2463           bus_context_log (transaction->context, DBUS_SYSTEM_LOG_WARNING,
2464                            "message from dbus-daemon rejected but not enough "
2465                            "memory to capture it");
2466         }
2467
2468       /* This is not fatal to the transaction so silently eat the disallowed
2469        * message (see reasoning above) */
2470       dbus_error_free (&error);
2471       return TRUE;
2472       break;
2473     case BUS_RESULT_LATER:
2474       if (!bus_deferred_message_queue_at_recipient(deferred_message, transaction, FALSE, FALSE))
2475           return FALSE;
2476       return TRUE; /* pretend to have sent it */
2477     }
2478
2479   return bus_transaction_send (transaction, connection, message, FALSE);
2480 }
2481
2482 dbus_bool_t
2483 bus_transaction_send (BusTransaction *transaction,
2484                       DBusConnection *connection,
2485                       DBusMessage    *message,
2486                       dbus_bool_t     deferred_dispatch)
2487 {
2488   MessageToSend *to_send;
2489   BusConnectionData *d;
2490   DBusList *link;
2491
2492   _dbus_verbose ("  trying to add %s interface=%s member=%s error=%s to transaction%s\n",
2493                  dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_ERROR ? "error" :
2494                  dbus_message_get_reply_serial (message) != 0 ? "reply" :
2495                  "message",
2496                  dbus_message_get_interface (message) ?
2497                  dbus_message_get_interface (message) : "(unset)",
2498                  dbus_message_get_member (message) ?
2499                  dbus_message_get_member (message) : "(unset)",
2500                  dbus_message_get_error_name (message) ?
2501                  dbus_message_get_error_name (message) : "(unset)",
2502                  dbus_connection_get_is_connected (connection) ?
2503                  "" : " (disconnected)");
2504
2505   _dbus_assert (dbus_message_get_sender (message) != NULL);
2506
2507   if (!dbus_connection_get_is_connected (connection))
2508     return TRUE; /* silently ignore disconnected connections */
2509
2510   d = BUS_CONNECTION_DATA (connection);
2511   _dbus_assert (d != NULL);
2512
2513   if (!deferred_dispatch && d->deferred_messages != NULL)
2514     {
2515       BusDeferredMessage *deferred_message;
2516       dbus_bool_t success;
2517       /* sender and addressed recipient are not required at this point as we only need to send message
2518        * to a single recipient without performing policy check. */
2519       deferred_message = bus_deferred_message_new (message,
2520                                                    NULL,
2521                                                    NULL,
2522                                                    connection,
2523                                                    BUS_RESULT_TRUE);
2524       if (deferred_message == NULL)
2525         return FALSE;
2526
2527       success = bus_deferred_message_queue_at_recipient(deferred_message, transaction,
2528           FALSE, FALSE);
2529       bus_deferred_message_unref(deferred_message);
2530
2531       return success;
2532     }
2533
2534   to_send = dbus_new (MessageToSend, 1);
2535   if (to_send == NULL)
2536     {
2537       return FALSE;
2538     }
2539
2540   to_send->preallocated = dbus_connection_preallocate_send (connection);
2541   if (to_send->preallocated == NULL)
2542     {
2543       dbus_free (to_send);
2544       return FALSE;
2545     }
2546
2547   dbus_message_ref (message);
2548   to_send->message = message;
2549   to_send->transaction = transaction;
2550
2551   _dbus_verbose ("about to prepend message\n");
2552
2553   if (!_dbus_list_prepend (&d->transaction_messages, to_send))
2554     {
2555       message_to_send_free (connection, to_send);
2556       return FALSE;
2557     }
2558
2559   _dbus_verbose ("prepended message\n");
2560
2561   /* See if we already had this connection in the list
2562    * for this transaction. If we have a pending message,
2563    * then we should already be in transaction->connections
2564    */
2565   link = _dbus_list_get_first_link (&d->transaction_messages);
2566   _dbus_assert (link->data == to_send);
2567   link = _dbus_list_get_next_link (&d->transaction_messages, link);
2568   while (link != NULL)
2569     {
2570       MessageToSend *m = link->data;
2571       DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2572
2573       if (m->transaction == transaction)
2574         break;
2575
2576       link = next;
2577     }
2578
2579   if (link == NULL)
2580     {
2581       if (!_dbus_list_prepend (&transaction->connections, connection))
2582         {
2583           _dbus_list_remove (&d->transaction_messages, to_send);
2584           message_to_send_free (connection, to_send);
2585           return FALSE;
2586         }
2587     }
2588
2589   return TRUE;
2590 }
2591
2592 static void
2593 transaction_free (BusTransaction *transaction)
2594 {
2595   _dbus_assert (transaction->connections == NULL);
2596
2597   free_cancel_hooks (transaction);
2598
2599   dbus_free (transaction);
2600 }
2601
2602 static void
2603 connection_cancel_transaction (DBusConnection *connection,
2604                                BusTransaction *transaction)
2605 {
2606   DBusList *link;
2607   BusConnectionData *d;
2608
2609   d = BUS_CONNECTION_DATA (connection);
2610   _dbus_assert (d != NULL);
2611
2612   link = _dbus_list_get_first_link (&d->transaction_messages);
2613   while (link != NULL)
2614     {
2615       MessageToSend *m = link->data;
2616       DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link);
2617
2618       if (m->transaction == transaction)
2619         {
2620           _dbus_list_remove_link (&d->transaction_messages,
2621                                   link);
2622
2623           message_to_send_free (connection, m);
2624         }
2625
2626       link = next;
2627     }
2628 }
2629
2630 void
2631 bus_transaction_cancel_and_free (BusTransaction *transaction)
2632 {
2633   DBusConnection *connection;
2634
2635   _dbus_verbose ("TRANSACTION: cancelled\n");
2636
2637   while ((connection = _dbus_list_pop_first (&transaction->connections)))
2638     connection_cancel_transaction (connection, transaction);
2639
2640   _dbus_list_foreach (&transaction->cancel_hooks,
2641                       cancel_hook_cancel, NULL);
2642
2643   transaction_free (transaction);
2644 }
2645
2646 static void
2647 connection_execute_transaction (DBusConnection *connection,
2648                                 BusTransaction *transaction)
2649 {
2650   DBusList *link;
2651   BusConnectionData *d;
2652
2653   d = BUS_CONNECTION_DATA (connection);
2654   _dbus_assert (d != NULL);
2655
2656   /* Send the queue in order (FIFO) */
2657   link = _dbus_list_get_last_link (&d->transaction_messages);
2658   while (link != NULL)
2659     {
2660       MessageToSend *m = link->data;
2661       DBusList *prev = _dbus_list_get_prev_link (&d->transaction_messages, link);
2662
2663       if (m->transaction == transaction)
2664         {
2665           _dbus_list_remove_link (&d->transaction_messages,
2666                                   link);
2667
2668           _dbus_assert (dbus_message_get_sender (m->message) != NULL);
2669
2670           dbus_connection_send_preallocated (connection,
2671                                              m->preallocated,
2672                                              m->message,
2673                                              NULL);
2674
2675           m->preallocated = NULL; /* so we don't double-free it */
2676
2677           message_to_send_free (connection, m);
2678         }
2679
2680       link = prev;
2681     }
2682 }
2683
2684 void
2685 bus_transaction_execute_and_free (BusTransaction *transaction)
2686 {
2687   /* For each connection in transaction->connections
2688    * send the messages
2689    */
2690   DBusConnection *connection;
2691
2692   _dbus_verbose ("TRANSACTION: executing\n");
2693
2694   while ((connection = _dbus_list_pop_first (&transaction->connections)))
2695     connection_execute_transaction (connection, transaction);
2696
2697   transaction_free (transaction);
2698 }
2699
2700 static void
2701 bus_connection_remove_transactions (DBusConnection *connection)
2702 {
2703   MessageToSend *to_send;
2704   BusConnectionData *d;
2705
2706   d = BUS_CONNECTION_DATA (connection);
2707   _dbus_assert (d != NULL);
2708
2709   while ((to_send = _dbus_list_get_first (&d->transaction_messages)))
2710     {
2711       /* only has an effect for the first MessageToSend listing this transaction */
2712       _dbus_list_remove (&to_send->transaction->connections,
2713                          connection);
2714
2715       _dbus_list_remove (&d->transaction_messages, to_send);
2716       message_to_send_free (connection, to_send);
2717     }
2718 }
2719
2720 /**
2721  * Converts the DBusError to a message reply
2722  */
2723 dbus_bool_t
2724 bus_transaction_send_error_reply (BusTransaction  *transaction,
2725                                   DBusConnection  *connection,
2726                                   const DBusError *error,
2727                                   DBusMessage     *in_reply_to)
2728 {
2729   DBusMessage *reply;
2730
2731   _dbus_assert (error != NULL);
2732   _DBUS_ASSERT_ERROR_IS_SET (error);
2733
2734   _dbus_verbose ("Sending error reply %s \"%s\"\n",
2735                  error->name, error->message);
2736
2737   reply = dbus_message_new_error (in_reply_to,
2738                                   error->name,
2739                                   error->message);
2740   if (reply == NULL)
2741     return FALSE;
2742
2743   if (!bus_transaction_send_from_driver (transaction, connection, reply))
2744     {
2745       dbus_message_unref (reply);
2746       return FALSE;
2747     }
2748
2749   dbus_message_unref (reply);
2750
2751   return TRUE;
2752 }
2753
2754 dbus_bool_t
2755 bus_transaction_add_cancel_hook (BusTransaction               *transaction,
2756                                  BusTransactionCancelFunction  cancel_function,
2757                                  void                         *data,
2758                                  DBusFreeFunction              free_data_function)
2759 {
2760   CancelHook *ch;
2761
2762   ch = dbus_new (CancelHook, 1);
2763   if (ch == NULL)
2764     return FALSE;
2765
2766   _dbus_verbose ("     adding cancel hook function = %p data = %p\n",
2767                  cancel_function, data);
2768
2769   ch->cancel_function = cancel_function;
2770   ch->data = data;
2771   ch->free_data_function = free_data_function;
2772
2773   /* It's important that the hooks get run in reverse order that they
2774    * were added
2775    */
2776   if (!_dbus_list_prepend (&transaction->cancel_hooks, ch))
2777     {
2778       dbus_free (ch);
2779       return FALSE;
2780     }
2781
2782   return TRUE;
2783 }
2784
2785 void
2786 bus_connection_dispatch_deferred (DBusConnection *connection)
2787 {
2788   BusDeferredMessage *message;
2789
2790   _dbus_return_if_fail (connection != NULL);
2791
2792   while ((message = bus_connection_pop_deferred_message(connection)) != NULL)
2793     {
2794       bus_deferred_message_dispatch(message);
2795       bus_deferred_message_unref(message);
2796     }
2797 }
2798
2799 dbus_bool_t
2800 bus_connection_has_deferred_messages (DBusConnection *connection)
2801 {
2802   BusConnectionData *d = BUS_CONNECTION_DATA(connection);
2803   return d->deferred_messages != NULL ? TRUE : FALSE;
2804 }
2805
2806 dbus_bool_t
2807 bus_connection_queue_deferred_message (DBusConnection *connection,
2808                                        BusDeferredMessage *message,
2809                                        dbus_bool_t prepend)
2810 {
2811   BusConnectionData *d = BUS_CONNECTION_DATA(connection);
2812   dbus_bool_t success;
2813   if (prepend)
2814     success = _dbus_list_prepend(&d->deferred_messages, message);
2815   else
2816     success = _dbus_list_append(&d->deferred_messages, message);
2817
2818   if (success)
2819     {
2820       bus_deferred_message_ref(message);
2821       return TRUE;
2822     }
2823
2824   return FALSE;
2825 }
2826
2827 dbus_bool_t
2828 bus_connection_replace_deferred_message (DBusConnection *connection,
2829                                          BusDeferredMessage *oldMessage,
2830                                          BusDeferredMessage *newMessage)
2831 {
2832   DBusList *link;
2833   BusConnectionData *d = BUS_CONNECTION_DATA(connection);
2834
2835   link = _dbus_list_find_first(&d->deferred_messages, oldMessage);
2836   if (link == NULL)
2837     return FALSE;
2838
2839   if (!_dbus_list_insert_after(&d->deferred_messages, link, newMessage))
2840     return FALSE;
2841
2842   bus_deferred_message_ref(newMessage);
2843   _dbus_list_remove_link(&d->deferred_messages, link);
2844   bus_deferred_message_unref(oldMessage);
2845   return TRUE;
2846 }
2847
2848 BusDeferredMessage *
2849 bus_connection_pop_deferred_message (DBusConnection *connection)
2850 {
2851   DBusList *link;
2852   BusDeferredMessage *message;
2853   BusConnectionData *d = BUS_CONNECTION_DATA(connection);
2854
2855   link =_dbus_list_get_first_link(&d->deferred_messages);
2856   if (link != NULL)
2857     {
2858       message = link->data;
2859       if (!bus_deferred_message_waits_for_check(message))
2860         {
2861           _dbus_list_remove_link(&d->deferred_messages, link);
2862           return message;
2863         }
2864     }
2865
2866   return NULL;
2867 }
2868
2869 dbus_bool_t
2870 bus_connection_putback_deferred_message (DBusConnection *connection, BusDeferredMessage *message)
2871 {
2872   BusConnectionData *d = BUS_CONNECTION_DATA(connection);
2873   if (_dbus_list_prepend(&d->deferred_messages, message))
2874     {
2875       return TRUE;
2876     }
2877   return FALSE;
2878 }
2879
2880 void
2881 bus_connection_clear_deferred_messages (DBusConnection *connection)
2882 {
2883   BusConnectionData *d = BUS_CONNECTION_DATA(connection);
2884   DBusList *link;
2885   DBusList *next;
2886   BusDeferredMessage *message;
2887
2888   link =_dbus_list_get_first_link(&d->deferred_messages);
2889   while (link != NULL)
2890     {
2891       next = _dbus_list_get_next_link (&d->deferred_messages, link);
2892       message = link->data;
2893
2894       bus_deferred_message_unref(message);
2895       _dbus_list_remove_link(&d->deferred_messages, link);
2896
2897       link = next;
2898     }
2899 }
2900
2901 void
2902 bus_connection_remove_deferred_message (DBusConnection *connection,
2903                                         BusDeferredMessage *message)
2904 {
2905   BusConnectionData *d = BUS_CONNECTION_DATA(connection);
2906   if (_dbus_list_remove(&d->deferred_messages, message))
2907     bus_deferred_message_unref(message);
2908 }
2909
2910 int
2911 bus_connections_get_n_active (BusConnections *connections)
2912 {
2913   return connections->n_completed;
2914 }
2915
2916 int
2917 bus_connections_get_n_incomplete (BusConnections *connections)
2918 {
2919   return connections->n_incomplete;
2920 }
2921
2922 #ifdef DBUS_ENABLE_STATS
2923 int
2924 bus_connections_get_total_match_rules (BusConnections *connections)
2925 {
2926   return connections->total_match_rules;
2927 }
2928
2929 int
2930 bus_connections_get_peak_match_rules (BusConnections *connections)
2931 {
2932   return connections->peak_match_rules;
2933 }
2934
2935 int
2936 bus_connections_get_peak_match_rules_per_conn (BusConnections *connections)
2937 {
2938   return connections->peak_match_rules_per_conn;
2939 }
2940
2941 int
2942 bus_connections_get_total_bus_names (BusConnections *connections)
2943 {
2944   return connections->total_bus_names;
2945 }
2946
2947 int
2948 bus_connections_get_peak_bus_names (BusConnections *connections)
2949 {
2950   return connections->peak_bus_names;
2951 }
2952
2953 int
2954 bus_connections_get_peak_bus_names_per_conn (BusConnections *connections)
2955 {
2956   return connections->peak_bus_names_per_conn;
2957 }
2958
2959 int
2960 bus_connection_get_peak_match_rules (DBusConnection *connection)
2961 {
2962   BusConnectionData *d;
2963
2964   d = BUS_CONNECTION_DATA (connection);
2965   _dbus_assert(d != NULL);
2966
2967   return d->peak_match_rules;
2968 }
2969
2970 int
2971 bus_connection_get_peak_bus_names (DBusConnection *connection)
2972 {
2973   BusConnectionData *d;
2974
2975   d = BUS_CONNECTION_DATA (connection);
2976   _dbus_assert(d != NULL);
2977
2978   return d->peak_bus_names;
2979 }
2980
2981 int bus_connection_get_n_pending_replies (DBusConnection *connection)
2982 {
2983   BusConnectionData *d;
2984   DBusList *link;
2985   BusPendingReply *pending;
2986   int count = 0;
2987
2988   d = BUS_CONNECTION_DATA (connection);
2989   _dbus_assert(d != NULL);
2990
2991   link = bus_expire_list_get_first_link(d->connections->pending_replies);
2992   while (link != NULL)
2993     {
2994       pending = link->data;
2995       link = bus_expire_list_get_next_link(d->connections->pending_replies,
2996         link);
2997       if (pending->will_get_reply == connection)
2998         ++count;
2999     }
3000
3001   return count;
3002 }
3003
3004 int
3005 bus_connection_get_peak_pending_replies (DBusConnection *connection)
3006 {
3007   BusConnectionData *d;
3008
3009   d = BUS_CONNECTION_DATA (connection);
3010   _dbus_assert (d != NULL);
3011
3012   return d->peak_pending_replies;
3013 }
3014 #endif /* DBUS_ENABLE_STATS */
3015
3016 dbus_bool_t
3017 bus_connection_is_monitor (DBusConnection *connection)
3018 {
3019   BusConnectionData *d;
3020
3021   d = BUS_CONNECTION_DATA (connection);
3022   _dbus_assert(d != NULL);
3023
3024   return d->link_in_monitors != NULL;
3025 }
3026
3027 static dbus_bool_t
3028 bcd_add_monitor_rules (BusConnectionData  *d,
3029                        DBusConnection     *connection,
3030                        DBusList          **rules)
3031 {
3032   BusMatchmaker *mm = d->connections->monitor_matchmaker;
3033   DBusList *iter;
3034
3035   if (mm == NULL)
3036     {
3037       mm = bus_matchmaker_new ();
3038
3039       if (mm == NULL)
3040         return FALSE;
3041
3042       d->connections->monitor_matchmaker = mm;
3043     }
3044
3045   for (iter = _dbus_list_get_first_link (rules);
3046       iter != NULL;
3047       iter = _dbus_list_get_next_link (rules, iter))
3048     {
3049       if (!bus_matchmaker_add_rule (mm, iter->data))
3050         {
3051           bus_matchmaker_disconnected (mm, connection);
3052           return FALSE;
3053         }
3054     }
3055
3056   return TRUE;
3057 }
3058
3059 static void
3060 bcd_drop_monitor_rules (BusConnectionData *d,
3061                         DBusConnection *connection)
3062 {
3063   BusMatchmaker *mm = d->connections->monitor_matchmaker;
3064
3065   if (mm != NULL)
3066     bus_matchmaker_disconnected (mm, connection);
3067 }
3068
3069 dbus_bool_t
3070 bus_connection_be_monitor (DBusConnection  *connection,
3071                            BusTransaction  *transaction,
3072                            DBusList       **rules,
3073                            DBusError       *error)
3074 {
3075   BusConnectionData *d;
3076   DBusList *link;
3077   DBusList *tmp;
3078   DBusList *iter;
3079
3080   d = BUS_CONNECTION_DATA (connection);
3081   _dbus_assert (d != NULL);
3082
3083   link = _dbus_list_alloc_link (connection);
3084
3085   if (link == NULL)
3086     {
3087       BUS_SET_OOM (error);
3088       return FALSE;
3089     }
3090
3091   if (!bcd_add_monitor_rules (d, connection, rules))
3092     {
3093       _dbus_list_free_link (link);
3094       BUS_SET_OOM (error);
3095       return FALSE;
3096     }
3097
3098   /* release all its names */
3099   if (!_dbus_list_copy (&d->services_owned, &tmp))
3100     {
3101       bcd_drop_monitor_rules (d, connection);
3102       _dbus_list_free_link (link);
3103       BUS_SET_OOM (error);
3104       return FALSE;
3105     }
3106
3107   for (iter = _dbus_list_get_first_link (&tmp);
3108       iter != NULL;
3109       iter = _dbus_list_get_next_link (&tmp, iter))
3110     {
3111       BusService *service = iter->data;
3112
3113       /* This call is transactional: if there isn't enough memory to
3114        * do everything, then the service gets all its names back when
3115        * the transaction is cancelled due to OOM. */
3116       if (!bus_service_remove_owner (service, connection, transaction, error))
3117         {
3118           bcd_drop_monitor_rules (d, connection);
3119           _dbus_list_free_link (link);
3120           _dbus_list_clear (&tmp);
3121           return FALSE;
3122         }
3123     }
3124
3125   /* We have now done everything that can fail, so there is no problem
3126    * with doing the irrevocable stuff. */
3127
3128   _dbus_list_clear (&tmp);
3129
3130   bus_context_log (transaction->context, DBUS_SYSTEM_LOG_INFO,
3131                    "Connection %s (%s) became a monitor.", d->name,
3132                    d->cached_loginfo_string);
3133
3134   if (d->n_match_rules > 0)
3135     {
3136       BusMatchmaker *mm;
3137
3138       mm = bus_context_get_matchmaker (d->connections->context);
3139       bus_matchmaker_disconnected (mm, connection);
3140     }
3141
3142   /* flag it as a monitor */
3143   d->link_in_monitors = link;
3144   _dbus_list_append_link (&d->connections->monitors, link);
3145
3146   /* it isn't allowed to reply, and it is no longer relevant whether it
3147    * receives replies */
3148   bus_connection_drop_pending_replies (d->connections, connection);
3149
3150   return TRUE;
3151 }