summaryrefslogtreecommitdiffstats
path: root/dbus/dbus-server.c
blob: 5e980cbd3b01320fc5bbd1dad145625c77e3a376 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-server.c DBusServer object
 *
 * Copyright (C) 2002, 2003, 2004, 2005 Red Hat Inc.
 *
 * Licensed under the Academic Free License version 2.1
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */ 

#include "dbus-server.h"
#include "dbus-server-unix.h"
#include "dbus-string.h"
#ifdef DBUS_BUILD_TESTS
#include "dbus-server-debug-pipe.h"
#endif
#include "dbus-address.h"
#include "dbus-protocol.h"

/**
 * @defgroup DBusServer DBusServer
 * @ingroup  DBus
 * @brief Server that listens for new connections.
 *
 * Types and functions related to DBusServer.
 * A DBusServer represents a server that other applications
 * can connect to. Each connection from another application
 * is represented by a DBusConnection.
 *
 * @todo Thread safety hasn't been looked at for #DBusServer
 * @todo Need notification to apps of disconnection, may matter for some transports
 */

/**
 * @defgroup DBusServerInternals DBusServer implementation details
 * @ingroup  DBusInternals
 * @brief Implementation details of DBusServer
 *
 * @{
 */

static void
init_guid (DBusGUID *guid)
{
  long now;
  char *p;
  int ts_size;

  _dbus_get_current_time (&now, NULL);

  guid->as_uint32s[0] = now;

  ts_size = sizeof (guid->as_uint32s[0]);
  p = ((char*)guid->as_bytes) + ts_size;
  
  _dbus_generate_random_bytes_buffer (p,
                                      sizeof (guid->as_bytes) - ts_size);
}

/* this is a little fragile since it assumes the address doesn't
 * already have a guid, but it shouldn't
 */
static char*
copy_address_with_guid_appended (const DBusString *address,
                                 const DBusString *guid_hex)
{
  DBusString with_guid;
  char *retval;
  
  if (!_dbus_string_init (&with_guid))
    return NULL;

  if (!_dbus_string_copy (address, 0, &with_guid,
                          _dbus_string_get_length (&with_guid)) ||
      !_dbus_string_append (&with_guid, ",guid=") ||
      !_dbus_string_copy (guid_hex, 0,
                          &with_guid, _dbus_string_get_length (&with_guid)))
    {
      _dbus_string_free (&with_guid);
      return NULL;
    }

  retval = NULL;
  _dbus_string_steal_data (&with_guid, &retval);

  _dbus_string_free (&with_guid);
      
  return retval; /* may be NULL if steal_data failed */
}

/**
 * Initializes the members of the DBusServer base class.
 * Chained up to by subclass constructors.
 *
 * @param server the server.
 * @param vtable the vtable for the subclass.
 * @param address the server's address
 * @returns #TRUE on success.
 */
dbus_bool_t
_dbus_server_init_base (DBusServer             *server,
                        const DBusServerVTable *vtable,
                        const DBusString       *address)
{
  DBusString guid_raw;
  
  server->vtable = vtable;
  server->refcount.value = 1;

  server->address = NULL;
  server->watches = NULL;
  server->timeouts = NULL;

  if (!_dbus_string_init (&server->guid_hex))
    return FALSE;

  init_guid (&server->guid);

  _dbus_string_init_const_len (&guid_raw, (signed char*) server->guid.as_bytes,
                               sizeof (server->guid.as_bytes));
  if (!_dbus_string_hex_encode (&guid_raw, 0,
                                &server->guid_hex,
                                _dbus_string_get_length (&server->guid_hex)))
    goto failed;
  
  server->address = copy_address_with_guid_appended (address,
                                                     &server->guid_hex);
  if (server->address == NULL)
    goto failed;
  
  _dbus_mutex_new_at_location (&server->mutex);
  if (server->mutex == NULL)
    goto failed;
  
  server->watches = _dbus_watch_list_new ();
  if (server->watches == NULL)
    goto failed;

  server->timeouts = _dbus_timeout_list_new ();
  if (server->timeouts == NULL)
    goto failed;

  _dbus_data_slot_list_init (&server->slot_list);

  _dbus_verbose ("Initialized server on address %s\n", server->address);
  
  return TRUE;

 failed:
  _dbus_mutex_free_at_location (&server->mutex);
  server->mutex = NULL;
  if (server->watches)
    {
      _dbus_watch_list_free (server->watches);
      server->watches = NULL;
    }
  if (server->timeouts)
    {
      _dbus_timeout_list_free (server->timeouts);
      server->timeouts = NULL;
    }
  if (server->address)
    {
      dbus_free (server->address);
      server->address = NULL;
    }
  _dbus_string_free (&server->guid_hex);
  
  return FALSE;
}

/**
 * Finalizes the members of the DBusServer base class.
 * Chained up to by subclass finalizers.
 *
 * @param server the server.
 */
void
_dbus_server_finalize_base (DBusServer *server)
{
  /* We don't have the lock, but nobody should be accessing
   * concurrently since they don't have a ref
   */
#ifndef DBUS_DISABLE_CHECKS
  _dbus_assert (!server->have_server_lock);
#endif
  _dbus_assert (server->disconnected);
  
  /* calls out to application code... */
  _dbus_data_slot_list_free (&server->slot_list);

  dbus_server_set_new_connection_function (server, NULL, NULL, NULL);

  _dbus_watch_list_free (server->watches);
  _dbus_timeout_list_free (server->timeouts);

  _dbus_mutex_free_at_location (&server->mutex);
  
  dbus_free (server->address);

  dbus_free_string_array (server->auth_mechanisms);

  _dbus_string_free (&server->guid_hex);
}


typedef dbus_bool_t (* DBusWatchAddFunction)     (DBusWatchList *list,
                                                  DBusWatch     *watch);
typedef void        (* DBusWatchRemoveFunction)  (DBusWatchList *list,
                                                  DBusWatch     *watch);
typedef void        (* DBusWatchToggleFunction)  (DBusWatchList *list,
                                                  DBusWatch     *watch,
                                                  dbus_bool_t    enabled);

static dbus_bool_t
protected_change_watch (DBusServer             *server,
                        DBusWatch              *watch,
                        DBusWatchAddFunction    add_function,
                        DBusWatchRemoveFunction remove_function,
                        DBusWatchToggleFunction toggle_function,
                        dbus_bool_t             enabled)
{
  DBusWatchList *watches;
  dbus_bool_t retval;
  
  HAVE_LOCK_CHECK (server);

  /* This isn't really safe or reasonable; a better pattern is the "do
   * everything, then drop lock and call out" one; but it has to be
   * propagated up through all callers
   */
  
  watches = server->watches;
  if (watches)
    {
      server->watches = NULL;
      _dbus_server_ref_unlocked (server);
      SERVER_UNLOCK (server);

      if (add_function)
        retval = (* add_function) (watches, watch);
      else if (remove_function)
        {
          retval = TRUE;
          (* remove_function) (watches, watch);
        }
      else
        {
          retval = TRUE;
          (* toggle_function) (watches, watch, enabled);
        }
      
      SERVER_LOCK (server);
      server->watches = watches;
      _dbus_server_unref_unlocked (server);

      return retval;
    }
  else
    return FALSE;
}

/**
 * Adds a watch for this server, chaining out to application-provided
 * watch handlers.
 *
 * @param server the server.
 * @param watch the watch to add.
 */
dbus_bool_t
_dbus_server_add_watch (DBusServer *server,
                        DBusWatch  *watch)
{
  HAVE_LOCK_CHECK (server);
  return protected_change_watch (server, watch,
                                 _dbus_watch_list_add_watch,
                                 NULL, NULL, FALSE);
}

/**
 * Removes a watch previously added with _dbus_server_remove_watch().
 *
 * @param server the server.
 * @param watch the watch to remove.
 */
void
_dbus_server_remove_watch  (DBusServer *server,
                            DBusWatch  *watch)
{
  HAVE_LOCK_CHECK (server);
  protected_change_watch (server, watch,
                          NULL,
                          _dbus_watch_list_remove_watch,
                          NULL, FALSE);
}

/**
 * Toggles a watch and notifies app via server's
 * DBusWatchToggledFunction if available. It's an error to call this
 * function on a watch that was not previously added.
 *
 * @param server the server.
 * @param watch the watch to toggle.
 * @param enabled whether to enable or disable
 */
void
_dbus_server_toggle_watch (DBusServer  *server,
                           DBusWatch   *watch,
                           dbus_bool_t  enabled)
{
  _dbus_assert (watch != NULL);

  HAVE_LOCK_CHECK (server);
  protected_change_watch (server, watch,
                          NULL, NULL,
                          _dbus_watch_list_toggle_watch,
                          enabled);
}


typedef dbus_bool_t (* DBusTimeoutAddFunction)    (DBusTimeoutList *list,
                                                   DBusTimeout     *timeout);
typedef void        (* DBusTimeoutRemoveFunction) (DBusTimeoutList *list,
                                                   DBusTimeout     *timeout);
typedef void        (* DBusTimeoutToggleFunction) (DBusTimeoutList *list,
                                                   DBusTimeout     *timeout,
                                                   dbus_bool_t      enabled);


static dbus_bool_t
protected_change_timeout (DBusServer               *server,
                          DBusTimeout              *timeout,
                          DBusTimeoutAddFunction    add_function,
                          DBusTimeoutRemoveFunction remove_function,
                          DBusTimeoutToggleFunction toggle_function,
                          dbus_bool_t               enabled)
{
  DBusTimeoutList *timeouts;
  dbus_bool_t retval;
  
  HAVE_LOCK_CHECK (server);

  /* This isn't really safe or reasonable; a better pattern is the "do everything, then
   * drop lock and call out" one; but it has to be propagated up through all callers
   */
  
  timeouts = server->timeouts;
  if (timeouts)
    {
      server->timeouts = NULL;
      _dbus_server_ref_unlocked (server);
      SERVER_UNLOCK (server);

      if (add_function)
        retval = (* add_function) (timeouts, timeout);
      else if (remove_function)
        {
          retval = TRUE;
          (* remove_function) (timeouts, timeout);
        }
      else
        {
          retval = TRUE;
          (* toggle_function) (timeouts, timeout, enabled);
        }
      
      SERVER_LOCK (server);
      server->timeouts = timeouts;
      _dbus_server_unref_unlocked (server);

      return retval;
    }
  else
    return FALSE;
}

/**
 * Adds a timeout for this server, chaining out to
 * application-provided timeout handlers. The timeout should be
 * repeatedly handled with dbus_timeout_handle() at its given interval
 * until it is removed.
 *
 * @param server the server.
 * @param timeout the timeout to add.
 */
dbus_bool_t
_dbus_server_add_timeout (DBusServer  *server,
			  DBusTimeout *timeout)
{
  return protected_change_timeout (server, timeout,
                                   _dbus_timeout_list_add_timeout,
                                   NULL, NULL, FALSE);
}

/**
 * Removes a timeout previously added with _dbus_server_add_timeout().
 *
 * @param server the server.
 * @param timeout the timeout to remove.
 */
void
_dbus_server_remove_timeout (DBusServer  *server,
			     DBusTimeout *timeout)
{
  protected_change_timeout (server, timeout,
                            NULL,
                            _dbus_timeout_list_remove_timeout,
                            NULL, FALSE);
}

/**
 * Toggles a timeout and notifies app via server's
 * DBusTimeoutToggledFunction if available. It's an error to call this
 * function on a timeout that was not previously added.
 *
 * @param server the server.
 * @param timeout the timeout to toggle.
 * @param enabled whether to enable or disable
 */
void
_dbus_server_toggle_timeout (DBusServer  *server,
                             DBusTimeout *timeout,
                             dbus_bool_t  enabled)
{
  protected_change_timeout (server, timeout,
                            NULL, NULL,
                            _dbus_timeout_list_toggle_timeout,
                            enabled);
}


/** @} */

/**
 * @addtogroup DBusServer
 *
 * @{
 */


/**
 * @typedef DBusServer
 *
 * An opaque object representing a server that listens for
 * connections from other applications. Each time a connection
 * is made, a new DBusConnection is created and made available
 * via an application-provided DBusNewConnectionFunction.
 * The DBusNewConnectionFunction is provided with
 * dbus_server_set_new_connection_function().
 * 
 */

/**
 * Listens for new connections on the given address.
 * Returns #NULL if listening fails for any reason.
 * Otherwise returns a new #DBusServer.
 * dbus_server_set_new_connection_function() and
 * dbus_server_set_watch_functions() should be called
 * immediately to render the server fully functional.
 *
 * @todo error messages on bad address could really be better.
 * DBusResultCode is a bit limiting here.
 *
 * @param address the address of this server.
 * @param error location to store rationale for failure.
 * @returns a new DBusServer, or #NULL on failure.
 * 
 */
DBusServer*
dbus_server_listen (const char     *address,
                    DBusError      *error)
{
  DBusServer *server;
  DBusAddressEntry **entries;
  int len, i;
  const char *address_problem_type;
  const char *address_problem_field;
  const char *address_problem_other;

  _dbus_return_val_if_fail (address != NULL, NULL);
  _dbus_return_val_if_error_is_set (error, NULL);
  
  if (!dbus_parse_address (address, &entries, &len, error))
    return NULL;

  server = NULL;
  address_problem_type = NULL;
  address_problem_field = NULL;
  address_problem_other = NULL;
  
  for (i = 0; i < len; i++)
    {
      const char *method;

      method = dbus_address_entry_get_method (entries[i]);

      if (strcmp (method, "unix") == 0)
	{
	  const char *path = dbus_address_entry_get_value (entries[i], "path");
          const char *tmpdir = dbus_address_entry_get_value (entries[i], "tmpdir");
          const char *abstract = dbus_address_entry_get_value (entries[i], "abstract");
          
	  if (path == NULL && tmpdir == NULL && abstract == NULL)
            {
              address_problem_type = "unix";
              address_problem_field = "path or tmpdir or abstract";
              goto bad_address;
            }

          if ((path && tmpdir) ||
              (path && abstract) ||
              (tmpdir && abstract))
            {
              address_problem_other = "cannot specify two of \"path\" and \"tmpdir\" and \"abstract\" at the same time";
              goto bad_address;
            }

          if (tmpdir != NULL)
            {
              DBusString full_path;
              DBusString filename;
              
              if (!_dbus_string_init (&full_path))
                {
                  dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
                  goto out;
                }
                  
              if (!_dbus_string_init (&filename))
                {
                  _dbus_string_free (&full_path);
                  dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
                  goto out;
                }
              
              if (!_dbus_string_append (&filename,
                                        "dbus-") ||
                  !_dbus_generate_random_ascii (&filename, 10) ||
                  !_dbus_string_append (&full_path, tmpdir) ||
                  !_dbus_concat_dir_and_file (&full_path, &filename))
                {
                  _dbus_string_free (&full_path);
                  _dbus_string_free (&filename);
                  dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
                  goto out;
                }
              
              /* Always use abstract namespace if possible with tmpdir */
              
              server =
                _dbus_server_new_for_domain_socket (_dbus_string_get_const_data (&full_path),
#ifdef HAVE_ABSTRACT_SOCKETS
                                                    TRUE,
#else
                                                    FALSE,
#endif
                                                    error);

              _dbus_string_free (&full_path);
              _dbus_string_free (&filename);
            }
          else
            {
              if (path)
                server = _dbus_server_new_for_domain_socket (path, FALSE, error);
              else
                server = _dbus_server_new_for_domain_socket (abstract, TRUE, error);
            }
	}
      else if (strcmp (method, "tcp") == 0)
	{
	  const char *host = dbus_address_entry_get_value (entries[i], "host");
          const char *port = dbus_address_entry_get_value (entries[i], "port");
          DBusString  str;
          long lport;
          dbus_bool_t sresult;
          
	  if (port == NULL)
            {
              address_problem_type = "tcp";
              address_problem_field = "port";
              goto bad_address;
            }

          _dbus_string_init_const (&str, port);
          sresult = _dbus_string_parse_int (&str, 0, &lport, NULL);
          _dbus_string_free (&str);
          
          if (sresult == FALSE || lport <= 0 || lport > 65535)
            {
              address_problem_other = "Port is not an integer between 0 and 65535";
              goto bad_address;
            }
          
	  server = _dbus_server_new_for_tcp_socket (host, lport, error);

	  if (server)
	    break;
	}
#ifdef DBUS_BUILD_TESTS
      else if (strcmp (method, "debug-pipe") == 0)
	{
	  const char *name = dbus_address_entry_get_value (entries[i], "name");

	  if (name == NULL)
            {
              address_problem_type = "debug-pipe";
              address_problem_field = "name";
              goto bad_address;
            }

	  server = _dbus_server_debug_pipe_new (name, error);
	}
#endif
      else
        {
          address_problem_other = "Unknown address type (examples of valid types are \"unix\" and \"tcp\")";
          goto bad_address;
        }
      
      if (server)
        break;
    }

 out:
  
  dbus_address_entries_free (entries);
  return server;

 bad_address:
  dbus_address_entries_free (entries);
  if (address_problem_type != NULL)
    dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
                    "Server address of type %s was missing argument %s",
                    address_problem_type, address_problem_field);
  else
    dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
                    "Could not parse server address: %s",
                    address_problem_other);

  return NULL;
}

/**
 * Increments the reference count of a DBusServer.
 *
 * @param server the server.
 * @returns the server
 */
DBusServer *
dbus_server_ref (DBusServer *server)
{
  _dbus_return_val_if_fail (server != NULL, NULL);
  _dbus_return_val_if_fail (server->refcount.value > 0, NULL);

#ifdef DBUS_HAVE_ATOMIC_INT
  _dbus_atomic_inc (&server->refcount);
#else
  SERVER_LOCK (server);
  _dbus_assert (server->refcount.value > 0);

  server->refcount.value += 1;
  SERVER_UNLOCK (server);
#endif

  return server;
}

/**
 * Decrements the reference count of a DBusServer.  Finalizes the
 * server if the reference count reaches zero.
 *
 * The server must be disconnected before the refcount reaches zero.
 *
 * @param server the server.
 */
void
dbus_server_unref (DBusServer *server)
{
  dbus_bool_t last_unref;
  
  _dbus_return_if_fail (server != NULL);
  _dbus_return_if_fail (server->refcount.value > 0);

#ifdef DBUS_HAVE_ATOMIC_INT
  last_unref = (_dbus_atomic_dec (&server->refcount) == 1);
#else
  SERVER_LOCK (server);
  
  _dbus_assert (server->refcount.value > 0);

  server->refcount.value -= 1;
  last_unref = (server->refcount.value == 0);
  
  SERVER_UNLOCK (server);
#endif
  
  if (last_unref)
    {
      /* lock not held! */
      _dbus_assert (server->disconnected);
      
      _dbus_assert (server->vtable->finalize != NULL);
      
      (* server->vtable->finalize) (server);
    }
}

/**
 * Like dbus_server_ref() but does not acquire the lock (must already be held)
 *
 * @param server the server.
 */
void
_dbus_server_ref_unlocked (DBusServer *server)
{
  _dbus_assert (server != NULL);
  _dbus_assert (server->refcount.value > 0);
  
  HAVE_LOCK_CHECK (server);

#ifdef DBUS_HAVE_ATOMIC_INT
  _dbus_atomic_inc (&server->refcount);
#else
  _dbus_assert (server->refcount.value > 0);

  server->refcount.value += 1;
#endif
}

/**
 * Like dbus_server_unref() but does not acquire the lock (must already be held)
 *
 * @param server the server.
 */
void
_dbus_server_unref_unlocked (DBusServer *server)
{
  dbus_bool_t last_unref;
  
  _dbus_assert (server != NULL);
  _dbus_assert (server->refcount.value > 0);

  HAVE_LOCK_CHECK (server);
  
#ifdef DBUS_HAVE_ATOMIC_INT
  last_unref = (_dbus_atomic_dec (&server->refcount) == 1);
#else
  _dbus_assert (server->refcount.value > 0);

  server->refcount.value -= 1;
  last_unref = (server->refcount.value == 0);
#endif
  
  if (last_unref)
    {
      _dbus_assert (server->disconnected);
      
      SERVER_UNLOCK (server);
      
      _dbus_assert (server->vtable->finalize != NULL);
      
      (* server->vtable->finalize) (server);
    }
}

/**
 * Releases the server's address and stops listening for
 * new clients. If called more than once, only the first
 * call has an effect. Does not modify the server's
 * reference count.
 * 
 * @param server the server.
 */
void
dbus_server_disconnect (DBusServer *server)
{
  _dbus_return_if_fail (server != NULL);
  _dbus_return_if_fail (server->refcount.value > 0);

  SERVER_LOCK (server);
  _dbus_server_ref_unlocked (server);
  
  _dbus_assert (server->vtable->disconnect != NULL);

  if (!server->disconnected)
    {
      /* this has to be first so recursive calls to disconnect don't happen */
      server->disconnected = TRUE;
      
      (* server->vtable->disconnect) (server);
    }

  SERVER_UNLOCK (server);
  dbus_server_unref (server);
}

/**
 * Returns #TRUE if the server is still listening for new connections.
 *
 * @param server the server.
 */
dbus_bool_t
dbus_server_get_is_connected (DBusServer *server)
{
  dbus_bool_t retval;
  
  _dbus_return_val_if_fail (server != NULL, FALSE);

  SERVER_LOCK (server);
  retval = !server->disconnected;
  SERVER_UNLOCK (server);

  return retval;
}

/**
 * Returns the address of the server, as a newly-allocated
 * string which must be freed by the caller.
 *
 * @param server the server
 * @returns the address or #NULL if no memory
 */
char*
dbus_server_get_address (DBusServer *server)
{
  char *retval;
  
  _dbus_return_val_if_fail (server != NULL, NULL);

  SERVER_LOCK (server);
  retval = _dbus_strdup (server->address);
  SERVER_UNLOCK (server);

  return retval;
}

/**
 * Sets a function to be used for handling new connections.  The given
 * function is passed each new connection as the connection is
 * created. If the new connection function increments the connection's
 * reference count, the connection will stay alive. Otherwise, the
 * connection will be unreferenced and closed.
 *
 * @param server the server.
 * @param function a function to handle new connections.
 * @param data data to pass to the new connection handler.
 * @param free_data_function function to free the data.
 */
void
dbus_server_set_new_connection_function (DBusServer                *server,
                                         DBusNewConnectionFunction  function,
                                         void                      *data,
                                         DBusFreeFunction           free_data_function)
{
  DBusFreeFunction old_free_function;
  void *old_data;
  
  _dbus_return_if_fail (server != NULL);

  SERVER_LOCK (server);
  old_free_function = server->new_connection_free_data_function;
  old_data = server->new_connection_data;
  
  server->new_connection_function = function;
  server->new_connection_data = data;
  server->new_connection_free_data_function = free_data_function;
  SERVER_UNLOCK (server);
    
  if (old_free_function != NULL)
    (* old_free_function) (old_data);
}

/**
 * Sets the watch functions for the connection. These functions are
 * responsible for making the application's main loop aware of file
 * descriptors that need to be monitored for events.
 *
 * This function behaves exactly like dbus_connection_set_watch_functions();
 * see the documentation for that routine.
 *
 * @param server the server.
 * @param add_function function to begin monitoring a new descriptor.
 * @param remove_function function to stop monitoring a descriptor.
 * @param toggled_function function to notify when the watch is enabled/disabled
 * @param data data to pass to add_function and remove_function.
 * @param free_data_function function to be called to free the data.
 * @returns #FALSE on failure (no memory)
 */
dbus_bool_t
dbus_server_set_watch_functions (DBusServer              *server,
                                 DBusAddWatchFunction     add_function,
                                 DBusRemoveWatchFunction  remove_function,
                                 DBusWatchToggledFunction toggled_function,
                                 void                    *data,
                                 DBusFreeFunction         free_data_function)
{
  dbus_bool_t result;
  DBusWatchList *watches;
  
  _dbus_return_val_if_fail (server != NULL, FALSE);

  SERVER_LOCK (server);
  watches = server->watches;
  server->watches = NULL;
  if (watches)
    {
      SERVER_UNLOCK (server);
      result = _dbus_watch_list_set_functions (watches,
                                               add_function,
                                               remove_function,
                                               toggled_function,
                                               data,
                                               free_data_function);
      SERVER_LOCK (server);
    }
  else
    {
      _dbus_warn ("Re-entrant call to %s\n", _DBUS_FUNCTION_NAME);
      result = FALSE;
    }
  server->watches = watches;
  SERVER_UNLOCK (server);
  
  return result;
}

/**
 * Sets the timeout functions for the connection. These functions are
 * responsible for making the application's main loop aware of timeouts.
 *
 * This function behaves exactly like dbus_connection_set_timeout_functions();
 * see the documentation for that routine.
 *
 * @param server the server.
 * @param add_function function to add a timeout.
 * @param remove_function function to remove a timeout.
 * @param toggled_function function to notify when the timeout is enabled/disabled
 * @param data data to pass to add_function and remove_function.
 * @param free_data_function function to be called to free the data.
 * @returns #FALSE on failure (no memory)
 */
dbus_bool_t
dbus_server_set_timeout_functions (DBusServer                *server,
				   DBusAddTimeoutFunction     add_function,
				   DBusRemoveTimeoutFunction  remove_function,
                                   DBusTimeoutToggledFunction toggled_function,
				   void                      *data,
				   DBusFreeFunction           free_data_function)
{
  dbus_bool_t result;
  DBusTimeoutList *timeouts;
  
  _dbus_return_val_if_fail (server != NULL, FALSE);

  SERVER_LOCK (server);
  timeouts = server->timeouts;
  server->timeouts = NULL;
  if (timeouts)
    {
      SERVER_UNLOCK (server);
      result = _dbus_timeout_list_set_functions (timeouts,
                                                 add_function,
                                                 remove_function,
                                                 toggled_function,
                                                 data,
                                                 free_data_function);
      SERVER_LOCK (server);
    }
  else
    {
      _dbus_warn ("Re-entrant call to %s\n", _DBUS_FUNCTION_NAME);
      result = FALSE;
    }
  server->timeouts = timeouts;
  SERVER_UNLOCK (server);
  
  return result;
}

/**
 * Sets the authentication mechanisms that this server offers
 * to clients, as a list of SASL mechanisms. This function
 * only affects connections created *after* it is called.
 * Pass #NULL instead of an array to use all available mechanisms.
 *
 * @param server the server
 * @param mechanisms #NULL-terminated array of mechanisms
 * @returns #FALSE if no memory
 */
dbus_bool_t
dbus_server_set_auth_mechanisms (DBusServer  *server,
                                 const char **mechanisms)
{
  char **copy;

  _dbus_return_val_if_fail (server != NULL, FALSE);

  SERVER_LOCK (server);
  
  if (mechanisms != NULL)
    {
      copy = _dbus_dup_string_array (mechanisms);
      if (copy == NULL)
        return FALSE;
    }
  else
    copy = NULL;

  dbus_free_string_array (server->auth_mechanisms);
  server->auth_mechanisms = copy;

  SERVER_UNLOCK (server);
  
  return TRUE;
}


static DBusDataSlotAllocator slot_allocator;
_DBUS_DEFINE_GLOBAL_LOCK (server_slots);

/**
 * Allocates an integer ID to be used for storing application-specific
 * data on any DBusServer. The allocated ID may then be used
 * with dbus_server_set_data() and dbus_server_get_data().
 * The slot must be initialized with -1. If a nonnegative
 * slot is passed in, the refcount is incremented on that
 * slot, rather than creating a new slot.
 *  
 * The allocated slot is global, i.e. all DBusServer objects will have
 * a slot with the given integer ID reserved.
 *
 * @param slot_p address of global variable storing the slot ID
 * @returns #FALSE on no memory
 */
dbus_bool_t
dbus_server_allocate_data_slot (dbus_int32_t *slot_p)
{
  return _dbus_data_slot_allocator_alloc (&slot_allocator,
                                          (DBusMutex **)&_DBUS_LOCK_NAME (server_slots),
                                          slot_p);
}

/**
 * Deallocates a global ID for server data slots.
 * dbus_server_get_data() and dbus_server_set_data()
 * may no longer be used with this slot.
 * Existing data stored on existing DBusServer objects
 * will be freed when the server is finalized,
 * but may not be retrieved (and may only be replaced
 * if someone else reallocates the slot).
 *
 * @param slot_p address of the slot to deallocate
 */
void
dbus_server_free_data_slot (dbus_int32_t *slot_p)
{
  _dbus_return_if_fail (*slot_p >= 0);
  
  _dbus_data_slot_allocator_free (&slot_allocator, slot_p);
}

/**
 * Stores a pointer on a DBusServer, along
 * with an optional function to be used for freeing
 * the data when the data is set again, or when
 * the server is finalized. The slot number
 * must have been allocated with dbus_server_allocate_data_slot().
 *
 * @param server the server
 * @param slot the slot number
 * @param data the data to store
 * @param free_data_func finalizer function for the data
 * @returns #TRUE if there was enough memory to store the data
 */
dbus_bool_t
dbus_server_set_data (DBusServer       *server,
                      int               slot,
                      void             *data,
                      DBusFreeFunction  free_data_func)
{
  DBusFreeFunction old_free_func;
  void *old_data;
  dbus_bool_t retval;

  _dbus_return_val_if_fail (server != NULL, FALSE);

  SERVER_LOCK (server);
  
  retval = _dbus_data_slot_list_set (&slot_allocator,
                                     &server->slot_list,
                                     slot, data, free_data_func,
                                     &old_free_func, &old_data);


  SERVER_UNLOCK (server);
  
  if (retval)
    {
      /* Do the actual free outside the server lock */
      if (old_free_func)
        (* old_free_func) (old_data);
    }

  return retval;
}

/**
 * Retrieves data previously set with dbus_server_set_data().
 * The slot must still be allocated (must not have been freed).
 *
 * @param server the server
 * @param slot the slot to get data from
 * @returns the data, or #NULL if not found
 */
void*
dbus_server_get_data (DBusServer   *server,
                      int           slot)
{
  void *res;

  _dbus_return_val_if_fail (server != NULL, NULL);
  
  SERVER_LOCK (server);
  
  res = _dbus_data_slot_list_get (&slot_allocator,
                                  &server->slot_list,
                                  slot);

  SERVER_UNLOCK (server);
  
  return res;
}

/** @} */

#ifdef DBUS_BUILD_TESTS
#include "dbus-test.h"

dbus_bool_t
_dbus_server_test (void)
{
  const char *valid_addresses[] = {
    "tcp:port=1234",
    "unix:path=./boogie",
    "tcp:host=localhost,port=1234",
    "tcp:host=localhost,port=1234;tcp:port=5678",
    "tcp:port=1234;unix:path=./boogie",
  };

  DBusServer *server;
  int i;
  
  for (i = 0; i < _DBUS_N_ELEMENTS (valid_addresses); i++)
    {
      server = dbus_server_listen (valid_addresses[i], NULL);
      if (server == NULL)
	_dbus_assert_not_reached ("Failed to listen for valid address.");

      dbus_server_disconnect (server);
      dbus_server_unref (server);

      /* Try disconnecting before unreffing */
      server = dbus_server_listen (valid_addresses[i], NULL);
      if (server == NULL)
	_dbus_assert_not_reached ("Failed to listen for valid address.");

      dbus_server_disconnect (server);
      dbus_server_unref (server);
    }

  return TRUE;
}

#endif /* DBUS_BUILD_TESTS */