Restore Dial, Queue, and FollowMe 'I' option support.
[asterisk/asterisk.git] / main / features.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 1999 - 2012, Digium, Inc.
5  * Copyright (C) 2012, Russell Bryant
6  *
7  * Mark Spencer <markster@digium.com>
8  *
9  * See http://www.asterisk.org for more information about
10  * the Asterisk project. Please do not directly contact
11  * any of the maintainers of this project for assistance;
12  * the project provides a web site, mailing lists and IRC
13  * channels for your use.
14  *
15  * This program is free software, distributed under the terms of
16  * the GNU General Public License Version 2. See the LICENSE file
17  * at the top of the source tree.
18  */
19
20 /*! \file
21  *
22  * \brief Routines implementing call features as call pickup, parking and transfer
23  *
24  * \author Mark Spencer <markster@digium.com>
25  */
26
27 /*! \li \ref features.c uses the configuration file \ref features.conf
28  * \addtogroup configuration_file Configuration Files
29  */
30
31 /*!
32  * \page features.conf features.conf
33  * \verbinclude features.conf.sample
34  */
35
36 /*** MODULEINFO
37         <support_level>core</support_level>
38  ***/
39
40 #include "asterisk.h"
41
42 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
43
44 #include "asterisk/_private.h"
45
46 #include <pthread.h>
47 #include <signal.h>
48 #include <sys/time.h>
49 #include <sys/signal.h>
50 #include <netinet/in.h>
51
52 #include "asterisk/lock.h"
53 #include "asterisk/file.h"
54 #include "asterisk/channel.h"
55 #include "asterisk/pbx.h"
56 #include "asterisk/causes.h"
57 #include "asterisk/module.h"
58 #include "asterisk/translate.h"
59 #include "asterisk/app.h"
60 #include "asterisk/say.h"
61 #include "asterisk/features.h"
62 #include "asterisk/musiconhold.h"
63 #include "asterisk/config.h"
64 #include "asterisk/cli.h"
65 #include "asterisk/manager.h"
66 #include "asterisk/utils.h"
67 #include "asterisk/adsi.h"
68 #include "asterisk/devicestate.h"
69 #include "asterisk/monitor.h"
70 #include "asterisk/audiohook.h"
71 #include "asterisk/global_datastores.h"
72 #include "asterisk/astobj2.h"
73 #include "asterisk/test.h"
74 #include "asterisk/bridge.h"
75 #include "asterisk/bridge_features.h"
76 #include "asterisk/bridge_basic.h"
77 #include "asterisk/bridge_after.h"
78 #include "asterisk/stasis.h"
79 #include "asterisk/stasis_channels.h"
80 #include "asterisk/features_config.h"
81
82 /*** DOCUMENTATION
83         <application name="Bridge" language="en_US">
84                 <synopsis>
85                         Bridge two channels.
86                 </synopsis>
87                 <syntax>
88                         <parameter name="channel" required="true">
89                                 <para>The current channel is bridged to the specified <replaceable>channel</replaceable>.</para>
90                         </parameter>
91                         <parameter name="options">
92                                 <optionlist>
93                                         <option name="p">
94                                                 <para>Play a courtesy tone to <replaceable>channel</replaceable>.</para>
95                                         </option>
96                                         <option name="F" argsep="^">
97                                                 <argument name="context" required="false" />
98                                                 <argument name="exten" required="false" />
99                                                 <argument name="priority" required="true" />
100                                                 <para>When the bridger hangs up, transfer the <emphasis>bridged</emphasis> party
101                                                 to the specified destination and <emphasis>start</emphasis> execution at that location.</para>
102                                                 <note>
103                                                         <para>Any channel variables you want the called channel to inherit from the caller channel must be
104                                                         prefixed with one or two underbars ('_').</para>
105                                                 </note>
106                                                 <note>
107                                                         <para>This option will override the 'x' option</para>
108                                                 </note>
109                                         </option>
110                                         <option name="F">
111                                                 <para>When the bridger hangs up, transfer the <emphasis>bridged</emphasis> party
112                                                 to the next priority of the current extension and <emphasis>start</emphasis> execution
113                                                 at that location.</para>
114                                                 <note>
115                                                         <para>Any channel variables you want the called channel to inherit from the caller channel must be
116                                                         prefixed with one or two underbars ('_').</para>
117                                                 </note>
118                                                 <note>
119                                                         <para>Using this option from a Macro() or GoSub() might not make sense as there would be no return points.</para>
120                                                 </note>
121                                                 <note>
122                                                         <para>This option will override the 'x' option</para>
123                                                 </note>
124                                         </option>
125
126                                         <option name="h">
127                                                 <para>Allow the called party to hang up by sending the
128                                                 <replaceable>*</replaceable> DTMF digit.</para>
129                                         </option>
130                                         <option name="H">
131                                                 <para>Allow the calling party to hang up by pressing the
132                                                 <replaceable>*</replaceable> DTMF digit.</para>
133                                         </option>
134                                         <option name="k">
135                                                 <para>Allow the called party to enable parking of the call by sending
136                                                 the DTMF sequence defined for call parking in <filename>features.conf</filename>.</para>
137                                         </option>
138                                         <option name="K">
139                                                 <para>Allow the calling party to enable parking of the call by sending
140                                                  the DTMF sequence defined for call parking in <filename>features.conf</filename>.</para>
141                                         </option>
142                                         <option name="L(x[:y][:z])">
143                                                 <para>Limit the call to <replaceable>x</replaceable> ms. Play a warning
144                                                 when <replaceable>y</replaceable> ms are left. Repeat the warning every
145                                                 <replaceable>z</replaceable> ms. The following special variables can be
146                                                 used with this option:</para>
147                                                 <variablelist>
148                                                         <variable name="LIMIT_PLAYAUDIO_CALLER">
149                                                                 <para>Play sounds to the caller. yes|no (default yes)</para>
150                                                         </variable>
151                                                         <variable name="LIMIT_PLAYAUDIO_CALLEE">
152                                                                 <para>Play sounds to the callee. yes|no</para>
153                                                         </variable>
154                                                         <variable name="LIMIT_TIMEOUT_FILE">
155                                                                 <para>File to play when time is up.</para>
156                                                         </variable>
157                                                         <variable name="LIMIT_CONNECT_FILE">
158                                                                 <para>File to play when call begins.</para>
159                                                         </variable>
160                                                         <variable name="LIMIT_WARNING_FILE">
161                                                                 <para>File to play as warning if <replaceable>y</replaceable> is
162                                                                 defined. The default is to say the time remaining.</para>
163                                                         </variable>
164                                                 </variablelist>
165                                         </option>
166                                         <option name="S(x)">
167                                                 <para>Hang up the call after <replaceable>x</replaceable> seconds *after* the called party has answered the call.</para>
168                                         </option>
169                                         <option name="t">
170                                                 <para>Allow the called party to transfer the calling party by sending the
171                                                 DTMF sequence defined in <filename>features.conf</filename>.</para>
172                                         </option>
173                                         <option name="T">
174                                                 <para>Allow the calling party to transfer the called party by sending the
175                                                 DTMF sequence defined in <filename>features.conf</filename>.</para>
176                                         </option>
177                                         <option name="w">
178                                                 <para>Allow the called party to enable recording of the call by sending
179                                                 the DTMF sequence defined for one-touch recording in <filename>features.conf</filename>.</para>
180                                         </option>
181                                         <option name="W">
182                                                 <para>Allow the calling party to enable recording of the call by sending
183                                                 the DTMF sequence defined for one-touch recording in <filename>features.conf</filename>.</para>
184                                         </option>
185                                         <option name="x">
186                                                 <para>Cause the called party to be hung up after the bridge, instead of being
187                                                 restarted in the dialplan.</para>
188                                         </option>
189                                 </optionlist>
190                         </parameter>
191                 </syntax>
192                 <description>
193                         <para>Allows the ability to bridge two channels via the dialplan.</para>
194                         <para>This application sets the following channel variable upon completion:</para>
195                         <variablelist>
196                                 <variable name="BRIDGERESULT">
197                                         <para>The result of the bridge attempt as a text string.</para>
198                                         <value name="SUCCESS" />
199                                         <value name="FAILURE" />
200                                         <value name="LOOP" />
201                                         <value name="NONEXISTENT" />
202                                         <value name="INCOMPATIBLE" />
203                                 </variable>
204                         </variablelist>
205                 </description>
206         </application>
207         <manager name="Bridge" language="en_US">
208                 <synopsis>
209                         Bridge two channels already in the PBX.
210                 </synopsis>
211                 <syntax>
212                         <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
213                         <parameter name="Channel1" required="true">
214                                 <para>Channel to Bridge to Channel2.</para>
215                         </parameter>
216                         <parameter name="Channel2" required="true">
217                                 <para>Channel to Bridge to Channel1.</para>
218                         </parameter>
219                         <parameter name="Tone">
220                                 <para>Play courtesy tone to Channel 2.</para>
221                                 <enumlist>
222                                         <enum name="no" />
223                                         <enum name="Channel1" />
224                                         <enum name="Channel2" />
225                                         <enum name="Both" />
226                                 </enumlist>
227                         </parameter>
228                 </syntax>
229                 <description>
230                         <para>Bridge together two channels already in the PBX.</para>
231                 </description>
232         </manager>
233  ***/
234
235 typedef enum {
236         FEATURE_INTERPRET_DETECT, /* Used by ast_feature_detect */
237         FEATURE_INTERPRET_DO,     /* Used by feature_interpret */
238         FEATURE_INTERPRET_CHECK,  /* Used by feature_check */
239 } feature_interpret_op;
240
241 struct ast_dial_features {
242         /*! Channel's feature flags. */
243         struct ast_flags my_features;
244         /*! Bridge peer's feature flags. */
245         struct ast_flags peer_features;
246 };
247
248 static void *dial_features_duplicate(void *data)
249 {
250         struct ast_dial_features *df = data, *df_copy;
251
252         if (!(df_copy = ast_calloc(1, sizeof(*df)))) {
253                 return NULL;
254         }
255
256         memcpy(df_copy, df, sizeof(*df));
257
258         return df_copy;
259 }
260
261 static const struct ast_datastore_info dial_features_info = {
262         .type = "dial-features",
263         .destroy = ast_free_ptr,
264         .duplicate = dial_features_duplicate,
265 };
266
267 /*!
268  * \internal
269  * \brief Set the features datastore if it doesn't exist.
270  *
271  * \param chan Channel to add features datastore
272  * \param my_features The channel's feature flags
273  * \param peer_features The channel's bridge peer feature flags
274  *
275  * \retval TRUE if features datastore already existed.
276  */
277 static int add_features_datastore(struct ast_channel *chan, const struct ast_flags *my_features, const struct ast_flags *peer_features)
278 {
279         struct ast_datastore *datastore;
280         struct ast_dial_features *dialfeatures;
281
282         ast_channel_lock(chan);
283         datastore = ast_channel_datastore_find(chan, &dial_features_info, NULL);
284         ast_channel_unlock(chan);
285         if (datastore) {
286                 /* Already exists. */
287                 return 1;
288         }
289
290         /* Create a new datastore with specified feature flags. */
291         datastore = ast_datastore_alloc(&dial_features_info, NULL);
292         if (!datastore) {
293                 ast_log(LOG_WARNING, "Unable to create channel features datastore.\n");
294                 return 0;
295         }
296         dialfeatures = ast_calloc(1, sizeof(*dialfeatures));
297         if (!dialfeatures) {
298                 ast_log(LOG_WARNING, "Unable to allocate memory for feature flags.\n");
299                 ast_datastore_free(datastore);
300                 return 0;
301         }
302         ast_copy_flags(&dialfeatures->my_features, my_features, AST_FLAGS_ALL);
303         ast_copy_flags(&dialfeatures->peer_features, peer_features, AST_FLAGS_ALL);
304         datastore->inheritance = DATASTORE_INHERIT_FOREVER;
305         datastore->data = dialfeatures;
306         ast_channel_lock(chan);
307         ast_channel_datastore_add(chan, datastore);
308         ast_channel_unlock(chan);
309         return 0;
310 }
311
312 struct ast_bridge_thread_obj
313 {
314         struct ast_bridge_config bconfig;
315         struct ast_channel *chan;
316         struct ast_channel *peer;
317         struct ast_callid *callid;                             /*<! callid pointer (Only used to bind thread) */
318         unsigned int return_to_pbx:1;
319 };
320
321 static const struct ast_datastore_info channel_app_data_datastore = {
322         .type = "Channel appdata datastore",
323         .destroy = ast_free_ptr,
324 };
325
326 static void set_config_flags(struct ast_channel *chan, struct ast_bridge_config *config)
327 {
328         ast_clear_flag(config, AST_FLAGS_ALL);
329
330         if (ast_test_flag(&config->features_caller, AST_FEATURE_DTMF_MASK)) {
331                 ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_0);
332         }
333         if (ast_test_flag(&config->features_callee, AST_FEATURE_DTMF_MASK)) {
334                 ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_1);
335         }
336
337         if (!(ast_test_flag(config, AST_BRIDGE_DTMF_CHANNEL_0) && ast_test_flag(config, AST_BRIDGE_DTMF_CHANNEL_1))) {
338                 RAII_VAR(struct ao2_container *, applicationmap, NULL, ao2_cleanup);
339
340                 ast_channel_lock(chan);
341                 applicationmap = ast_get_chan_applicationmap(chan);
342                 ast_channel_unlock(chan);
343
344                 if (!applicationmap) {
345                         return;
346                 }
347
348                 /* If an applicationmap exists for this channel at all, then the channel needs the DTMF flag set */
349                 ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_0);
350         }
351 }
352
353 void ast_channel_log(char *title, struct ast_channel *chan);
354
355 void ast_channel_log(char *title, struct ast_channel *chan) /* for debug, this is handy enough to justify keeping it in the source */
356 {
357         ast_log(LOG_NOTICE, "______ %s (%lx)______\n", title, (unsigned long) chan);
358         ast_log(LOG_NOTICE, "CHAN: name: %s;  appl: %s; data: %s; contxt: %s;  exten: %s; pri: %d;\n",
359                 ast_channel_name(chan), ast_channel_appl(chan), ast_channel_data(chan),
360                 ast_channel_context(chan), ast_channel_exten(chan), ast_channel_priority(chan));
361         ast_log(LOG_NOTICE, "CHAN: acctcode: %s;  dialcontext: %s; amaflags: %x; maccontxt: %s;  macexten: %s; macpri: %d;\n",
362                 ast_channel_accountcode(chan), ast_channel_dialcontext(chan), ast_channel_amaflags(chan),
363                 ast_channel_macrocontext(chan), ast_channel_macroexten(chan), ast_channel_macropriority(chan));
364         ast_log(LOG_NOTICE, "CHAN: masq: %p;  masqr: %p; uniqueID: %s; linkedID:%s\n",
365                 ast_channel_masq(chan), ast_channel_masqr(chan),
366                 ast_channel_uniqueid(chan), ast_channel_linkedid(chan));
367         if (ast_channel_masqr(chan)) {
368                 ast_log(LOG_NOTICE, "CHAN: masquerading as: %s;  cdr: %p;\n",
369                         ast_channel_name(ast_channel_masqr(chan)), ast_channel_cdr(ast_channel_masqr(chan)));
370         }
371
372         ast_log(LOG_NOTICE, "===== done ====\n");
373 }
374
375 static void set_bridge_features_on_config(struct ast_bridge_config *config, const char *features)
376 {
377         const char *feature;
378
379         if (ast_strlen_zero(features)) {
380                 return;
381         }
382
383         for (feature = features; *feature; feature++) {
384                 struct ast_flags *party;
385
386                 if (isupper(*feature)) {
387                         party = &config->features_caller;
388                 } else {
389                         party = &config->features_callee;
390                 }
391
392                 switch (tolower(*feature)) {
393                 case 't' :
394                         ast_set_flag(party, AST_FEATURE_REDIRECT);
395                         break;
396                 case 'k' :
397                         ast_set_flag(party, AST_FEATURE_PARKCALL);
398                         break;
399                 case 'h' :
400                         ast_set_flag(party, AST_FEATURE_DISCONNECT);
401                         break;
402                 case 'w' :
403                         ast_set_flag(party, AST_FEATURE_AUTOMON);
404                         break;
405                 case 'x' :
406                         ast_set_flag(party, AST_FEATURE_AUTOMIXMON);
407                         break;
408                 default :
409                         ast_log(LOG_WARNING, "Skipping unknown feature code '%c'\n", *feature);
410                         break;
411                 }
412         }
413 }
414
415 static void add_features_datastores(struct ast_channel *caller, struct ast_channel *callee, struct ast_bridge_config *config)
416 {
417         if (add_features_datastore(caller, &config->features_caller, &config->features_callee)) {
418                 /*
419                  * If we don't return here, then when we do a builtin_atxfer we
420                  * will copy the disconnect flags over from the atxfer to the
421                  * callee (Party C).
422                  */
423                 return;
424         }
425
426         add_features_datastore(callee, &config->features_callee, &config->features_caller);
427 }
428
429 static void clear_dialed_interfaces(struct ast_channel *chan)
430 {
431         struct ast_datastore *di_datastore;
432
433         ast_channel_lock(chan);
434         if ((di_datastore = ast_channel_datastore_find(chan, &dialed_interface_info, NULL))) {
435                 if (option_debug) {
436                         ast_log(LOG_DEBUG, "Removing dialed interfaces datastore on %s since we're bridging\n", ast_channel_name(chan));
437                 }
438                 if (!ast_channel_datastore_remove(chan, di_datastore)) {
439                         ast_datastore_free(di_datastore);
440                 }
441         }
442         ast_channel_unlock(chan);
443 }
444
445 static void bridge_config_set_limits_warning_values(struct ast_bridge_config *config, struct ast_bridge_features_limits *limits)
446 {
447         if (config->end_sound) {
448                 ast_string_field_set(limits, duration_sound, config->end_sound);
449         }
450
451         if (config->warning_sound) {
452                 ast_string_field_set(limits, warning_sound, config->warning_sound);
453         }
454
455         if (config->start_sound) {
456                 ast_string_field_set(limits, connect_sound, config->start_sound);
457         }
458
459         limits->frequency = config->warning_freq;
460         limits->warning = config->play_warning;
461 }
462
463 /*!
464  * \internal brief Setup limit hook structures on calls that need limits
465  *
466  * \param config ast_bridge_config which provides the limit data
467  * \param caller_limits pointer to an ast_bridge_features_limits struct which will store the caller side limits
468  * \param callee_limits pointer to an ast_bridge_features_limits struct which will store the callee side limits
469  */
470 static void bridge_config_set_limits(struct ast_bridge_config *config, struct ast_bridge_features_limits *caller_limits, struct ast_bridge_features_limits *callee_limits)
471 {
472         if (ast_test_flag(&config->features_caller, AST_FEATURE_PLAY_WARNING)) {
473                 bridge_config_set_limits_warning_values(config, caller_limits);
474         }
475
476         if (ast_test_flag(&config->features_callee, AST_FEATURE_PLAY_WARNING)) {
477                 bridge_config_set_limits_warning_values(config, callee_limits);
478         }
479
480         caller_limits->duration = config->timelimit;
481         callee_limits->duration = config->timelimit;
482 }
483
484 /*!
485  * \internal
486  * \brief Check if Monitor needs to be started on a channel.
487  * \since 12.0.0
488  *
489  * \param chan The bridge considers this channel the caller.
490  * \param peer The bridge considers this channel the callee.
491  *
492  * \return Nothing
493  */
494 static void bridge_check_monitor(struct ast_channel *chan, struct ast_channel *peer)
495 {
496         const char *value;
497         const char *monitor_args = NULL;
498         struct ast_channel *monitor_chan = NULL;
499
500         ast_channel_lock(chan);
501         value = pbx_builtin_getvar_helper(chan, "AUTO_MONITOR");
502         if (!ast_strlen_zero(value)) {
503                 monitor_args = ast_strdupa(value);
504                 monitor_chan = chan;
505         }
506         ast_channel_unlock(chan);
507         if (!monitor_chan) {
508                 ast_channel_lock(peer);
509                 value = pbx_builtin_getvar_helper(peer, "AUTO_MONITOR");
510                 if (!ast_strlen_zero(value)) {
511                         monitor_args = ast_strdupa(value);
512                         monitor_chan = peer;
513                 }
514                 ast_channel_unlock(peer);
515         }
516         if (monitor_chan) {
517                 struct ast_app *monitor_app;
518
519                 monitor_app = pbx_findapp("Monitor");
520                 if (monitor_app) {
521                         pbx_exec(monitor_chan, monitor_app, monitor_args);
522                 }
523         }
524 }
525
526 /*!
527  * \internal
528  * \brief Send the peer channel on its way on bridge start failure.
529  * \since 12.0.0
530  *
531  * \param chan Chan to put into autoservice.
532  * \param peer Chan to send to after bridge goto or run hangup handlers and hangup.
533  *
534  * \return Nothing
535  */
536 static void bridge_failed_peer_goto(struct ast_channel *chan, struct ast_channel *peer)
537 {
538         if (ast_bridge_setup_after_goto(peer)
539                 || ast_pbx_start(peer)) {
540                 ast_autoservice_chan_hangup_peer(chan, peer);
541         }
542 }
543
544 static int pre_bridge_setup(struct ast_channel *chan, struct ast_channel *peer, struct ast_bridge_config *config,
545                 struct ast_bridge_features *chan_features, struct ast_bridge_features *peer_features)
546 {
547         int res;
548
549         set_bridge_features_on_config(config, pbx_builtin_getvar_helper(chan, "BRIDGE_FEATURES"));
550         add_features_datastores(chan, peer, config);
551
552         /*
553          * This is an interesting case.  One example is if a ringing
554          * channel gets redirected to an extension that picks up a
555          * parked call.  This will make sure that the call taken out of
556          * parking gets told that the channel it just got bridged to is
557          * still ringing.
558          */
559         if (ast_channel_state(chan) == AST_STATE_RINGING
560                 && ast_channel_visible_indication(peer) != AST_CONTROL_RINGING) {
561                 ast_indicate(peer, AST_CONTROL_RINGING);
562         }
563
564         bridge_check_monitor(chan, peer);
565
566         set_config_flags(chan, config);
567
568         /* Answer if need be */
569         if (ast_channel_state(chan) != AST_STATE_UP) {
570                 if (ast_raw_answer(chan)) {
571                         return -1;
572                 }
573         }
574
575 #ifdef FOR_DEBUG
576         /* show the two channels and cdrs involved in the bridge for debug & devel purposes */
577         ast_channel_log("Pre-bridge CHAN Channel info", chan);
578         ast_channel_log("Pre-bridge PEER Channel info", peer);
579 #endif
580
581         /*
582          * If we are bridging a call, stop worrying about forwarding
583          * loops.  We presume that if a call is being bridged, that the
584          * humans in charge know what they're doing.  If they don't,
585          * well, what can we do about that?
586          */
587         clear_dialed_interfaces(chan);
588         clear_dialed_interfaces(peer);
589
590         res = 0;
591         ast_channel_lock(chan);
592         res |= ast_bridge_features_ds_append(chan, &config->features_caller);
593         ast_channel_unlock(chan);
594         ast_channel_lock(peer);
595         res |= ast_bridge_features_ds_append(peer, &config->features_callee);
596         ast_channel_unlock(peer);
597
598         if (res) {
599                 return -1;
600         }
601
602         if (config->timelimit) {
603                 struct ast_bridge_features_limits call_duration_limits_chan;
604                 struct ast_bridge_features_limits call_duration_limits_peer;
605                 int abandon_call = 0; /* TRUE if set limits fails so we can abandon the call. */
606
607                 if (ast_bridge_features_limits_construct(&call_duration_limits_chan)) {
608                         ast_log(LOG_ERROR, "Could not construct caller duration limits. Bridge canceled.\n");
609
610                         return -1;
611                 }
612
613                 if (ast_bridge_features_limits_construct(&call_duration_limits_peer)) {
614                         ast_log(LOG_ERROR, "Could not construct callee duration limits. Bridge canceled.\n");
615                         ast_bridge_features_limits_destroy(&call_duration_limits_chan);
616
617                         return -1;
618                 }
619
620                 bridge_config_set_limits(config, &call_duration_limits_chan, &call_duration_limits_peer);
621
622                 if (ast_bridge_features_set_limits(chan_features, &call_duration_limits_chan, 0)) {
623                         abandon_call = 1;
624                 }
625                 if (ast_bridge_features_set_limits(peer_features, &call_duration_limits_peer, 0)) {
626                         abandon_call = 1;
627                 }
628
629                 /* At this point we are done with the limits structs since they have been copied to the individual feature sets. */
630                 ast_bridge_features_limits_destroy(&call_duration_limits_chan);
631                 ast_bridge_features_limits_destroy(&call_duration_limits_peer);
632
633                 if (abandon_call) {
634                         ast_log(LOG_ERROR, "Could not set duration limits on one or more sides of the call. Bridge canceled.\n");
635                         return -1;
636                 }
637         }
638
639         return 0;
640 }
641
642 int ast_bridge_call_with_flags(struct ast_channel *chan, struct ast_channel *peer, struct ast_bridge_config *config, unsigned int flags)
643 {
644         int res;
645         struct ast_bridge *bridge;
646         struct ast_bridge_features chan_features;
647         struct ast_bridge_features *peer_features;
648
649         /* Setup features. */
650         res = ast_bridge_features_init(&chan_features);
651         peer_features = ast_bridge_features_new();
652         if (res || !peer_features) {
653                 ast_bridge_features_destroy(peer_features);
654                 ast_bridge_features_cleanup(&chan_features);
655                 bridge_failed_peer_goto(chan, peer);
656                 return -1;
657         }
658
659         if (pre_bridge_setup(chan, peer, config, &chan_features, peer_features)) {
660                 ast_bridge_features_destroy(peer_features);
661                 ast_bridge_features_cleanup(&chan_features);
662                 bridge_failed_peer_goto(chan, peer);
663                 return -1;
664         }
665
666         /* Create bridge */
667         bridge = ast_bridge_basic_new();
668         if (!bridge) {
669                 ast_bridge_features_destroy(peer_features);
670                 ast_bridge_features_cleanup(&chan_features);
671                 bridge_failed_peer_goto(chan, peer);
672                 return -1;
673         }
674
675         ast_bridge_basic_set_flags(bridge, flags);
676
677         /* Put peer into the bridge */
678         if (ast_bridge_impart(bridge, peer, NULL, peer_features,
679                 AST_BRIDGE_IMPART_CHAN_INDEPENDENT | AST_BRIDGE_IMPART_INHIBIT_JOIN_COLP)) {
680                 ast_bridge_destroy(bridge, 0);
681                 ast_bridge_features_cleanup(&chan_features);
682                 bridge_failed_peer_goto(chan, peer);
683                 return -1;
684         }
685
686         /* Join bridge */
687         ast_bridge_join(bridge, chan, NULL, &chan_features, NULL,
688                 AST_BRIDGE_JOIN_PASS_REFERENCE | AST_BRIDGE_JOIN_INHIBIT_JOIN_COLP);
689
690         /*
691          * If the bridge was broken for a hangup that isn't real, then
692          * don't run the h extension, because the channel isn't really
693          * hung up.  This should really only happen with
694          * AST_SOFTHANGUP_ASYNCGOTO.
695          */
696         res = -1;
697         ast_channel_lock(chan);
698         if (ast_channel_softhangup_internal_flag(chan) & AST_SOFTHANGUP_ASYNCGOTO) {
699                 res = 0;
700         }
701         ast_channel_unlock(chan);
702
703         ast_bridge_features_cleanup(&chan_features);
704
705         if (res && config->end_bridge_callback) {
706                 config->end_bridge_callback(config->end_bridge_callback_data);
707         }
708
709         return res;
710 }
711
712 /*!
713  * \brief bridge the call and set CDR
714  *
715  * \param chan The bridge considers this channel the caller.
716  * \param peer The bridge considers this channel the callee.
717  * \param config Configuration for this bridge.
718  *
719  * Set start time, check for two channels,check if monitor on
720  * check for feature activation, create new CDR
721  * \retval res on success.
722  * \retval -1 on failure to bridge.
723  */
724 int ast_bridge_call(struct ast_channel *chan, struct ast_channel *peer, struct ast_bridge_config *config)
725 {
726         return ast_bridge_call_with_flags(chan, peer, config, 0);
727 }
728
729 enum play_tone_action {
730         PLAYTONE_NONE = 0,
731         PLAYTONE_CHANNEL1 = (1 << 0),
732         PLAYTONE_CHANNEL2 = (1 << 1),
733         PLAYTONE_BOTH = PLAYTONE_CHANNEL1 | PLAYTONE_CHANNEL2,
734 };
735
736 static enum play_tone_action parse_playtone(const char *playtone_val)
737 {
738         if (ast_strlen_zero(playtone_val) || ast_false(playtone_val)) {
739                 return PLAYTONE_NONE;
740         } if (!strcasecmp(playtone_val, "channel1")) {
741                 return PLAYTONE_CHANNEL1;
742         } else if (!strcasecmp(playtone_val, "channel2") || ast_true(playtone_val)) {
743                 return PLAYTONE_CHANNEL2;
744         } else if (!strcasecmp(playtone_val, "both")) {
745                 return PLAYTONE_BOTH;
746         } else {
747                 /* Invalid input. Assume none */
748                 return PLAYTONE_NONE;
749         }
750 }
751
752 /*!
753  * \brief Bridge channels together
754  * \param s
755  * \param m
756  *
757  * Make sure valid channels were specified,
758  * send errors if any of the channels could not be found/locked, answer channels if needed,
759  * create the placeholder channels and grab the other channels
760  * make the channels compatible, send error if we fail doing so
761  * setup the bridge thread object and start the bridge.
762  *
763  * \retval 0
764  */
765 static int action_bridge(struct mansession *s, const struct message *m)
766 {
767         const char *channela = astman_get_header(m, "Channel1");
768         const char *channelb = astman_get_header(m, "Channel2");
769         enum play_tone_action playtone = parse_playtone(astman_get_header(m, "Tone"));
770         RAII_VAR(struct ast_channel *, chana, NULL, ao2_cleanup);
771         RAII_VAR(struct ast_channel *, chanb, NULL, ao2_cleanup);
772         const char *chana_exten;
773         const char *chana_context;
774         int chana_priority;
775         const char *chanb_exten;
776         const char *chanb_context;
777         int chanb_priority;
778         struct ast_bridge *bridge;
779         char buf[256];
780         RAII_VAR(struct ast_features_xfer_config *, xfer_cfg_a, NULL, ao2_cleanup);
781         RAII_VAR(struct ast_features_xfer_config *, xfer_cfg_b, NULL, ao2_cleanup);
782
783         /* make sure valid channels were specified */
784         if (ast_strlen_zero(channela) || ast_strlen_zero(channelb)) {
785                 astman_send_error(s, m, "Missing channel parameter in request");
786                 return 0;
787         }
788
789         ast_debug(1, "Performing Bridge action on %s and %s\n", channela, channelb);
790
791         /* Start with chana */
792         chana = ast_channel_get_by_name_prefix(channela, strlen(channela));
793         if (!chana) {
794                 snprintf(buf, sizeof(buf), "Channel1 does not exist: %s", channela);
795                 astman_send_error(s, m, buf);
796                 return 0;
797         }
798         xfer_cfg_a = ast_get_chan_features_xfer_config(chana);
799         ast_channel_lock(chana);
800         chana_exten = ast_strdupa(ast_channel_exten(chana));
801         chana_context = ast_strdupa(ast_channel_context(chana));
802         chana_priority = ast_channel_priority(chana);
803         if (!ast_test_flag(ast_channel_flags(chana), AST_FLAG_IN_AUTOLOOP)) {
804                 chana_priority++;
805         }
806         ast_channel_unlock(chana);
807
808         chanb = ast_channel_get_by_name_prefix(channelb, strlen(channelb));
809         if (!chanb) {
810                 snprintf(buf, sizeof(buf), "Channel2 does not exist: %s", channelb);
811                 astman_send_error(s, m, buf);
812                 return 0;
813         }
814         xfer_cfg_b = ast_get_chan_features_xfer_config(chanb);
815         ast_channel_lock(chanb);
816         chanb_exten = ast_strdupa(ast_channel_exten(chanb));
817         chanb_context = ast_strdupa(ast_channel_context(chanb));
818         chanb_priority = ast_channel_priority(chanb);
819         if (!ast_test_flag(ast_channel_flags(chanb), AST_FLAG_IN_AUTOLOOP)) {
820                 chanb_priority++;
821         }
822         ast_channel_unlock(chanb);
823
824         bridge = ast_bridge_basic_new();
825         if (!bridge) {
826                 astman_send_error(s, m, "Unable to create bridge\n");
827                 return 0;
828         }
829
830         ast_bridge_set_after_go_on(chana, chana_context, chana_exten, chana_priority, NULL);
831         if (ast_bridge_add_channel(bridge, chana, NULL, playtone & PLAYTONE_CHANNEL1, xfer_cfg_a ? xfer_cfg_a->xfersound : NULL)) {
832                 snprintf(buf, sizeof(buf), "Unable to add Channel1 to bridge: %s", ast_channel_name(chana));
833                 astman_send_error(s, m, buf);
834                 ast_bridge_destroy(bridge, 0);
835                 return 0;
836         }
837
838         ast_bridge_set_after_go_on(chanb, chanb_context, chanb_exten, chanb_priority, NULL);
839         if (ast_bridge_add_channel(bridge, chanb, NULL, playtone & PLAYTONE_CHANNEL2, xfer_cfg_b ? xfer_cfg_b->xfersound : NULL)) {
840                 snprintf(buf, sizeof(buf), "Unable to add Channel2 to bridge: %s", ast_channel_name(chanb));
841                 astman_send_error(s, m, buf);
842                 ast_bridge_destroy(bridge, 0);
843                 return 0;
844         }
845
846         astman_send_ack(s, m, "Channels have been bridged");
847
848         return 0;
849 }
850
851 static char *app_bridge = "Bridge";
852
853 enum {
854         BRIDGE_OPT_PLAYTONE = (1 << 0),
855         OPT_CALLEE_HANGUP =     (1 << 1),
856         OPT_CALLER_HANGUP =     (1 << 2),
857         OPT_DURATION_LIMIT = (1 << 3),
858         OPT_DURATION_STOP =     (1 << 4),
859         OPT_CALLEE_TRANSFER = (1 << 5),
860         OPT_CALLER_TRANSFER = (1 << 6),
861         OPT_CALLEE_MONITOR = (1 << 7),
862         OPT_CALLER_MONITOR = (1 << 8),
863         OPT_CALLEE_PARK = (1 << 9),
864         OPT_CALLER_PARK = (1 << 10),
865         OPT_CALLEE_KILL = (1 << 11),
866         OPT_CALLEE_GO_ON = (1 << 12),
867 };
868
869 enum {
870         OPT_ARG_DURATION_LIMIT = 0,
871         OPT_ARG_DURATION_STOP,
872         OPT_ARG_CALLEE_GO_ON,
873         /* note: this entry _MUST_ be the last one in the enum */
874         OPT_ARG_ARRAY_SIZE,
875 };
876
877 AST_APP_OPTIONS(bridge_exec_options, BEGIN_OPTIONS
878         AST_APP_OPTION('p', BRIDGE_OPT_PLAYTONE),
879         AST_APP_OPTION_ARG('F', OPT_CALLEE_GO_ON, OPT_ARG_CALLEE_GO_ON),
880         AST_APP_OPTION('h', OPT_CALLEE_HANGUP),
881         AST_APP_OPTION('H', OPT_CALLER_HANGUP),
882         AST_APP_OPTION('k', OPT_CALLEE_PARK),
883         AST_APP_OPTION('K', OPT_CALLER_PARK),
884         AST_APP_OPTION_ARG('L', OPT_DURATION_LIMIT, OPT_ARG_DURATION_LIMIT),
885         AST_APP_OPTION_ARG('S', OPT_DURATION_STOP, OPT_ARG_DURATION_STOP),
886         AST_APP_OPTION('t', OPT_CALLEE_TRANSFER),
887         AST_APP_OPTION('T', OPT_CALLER_TRANSFER),
888         AST_APP_OPTION('w', OPT_CALLEE_MONITOR),
889         AST_APP_OPTION('W', OPT_CALLER_MONITOR),
890         AST_APP_OPTION('x', OPT_CALLEE_KILL),
891 END_OPTIONS );
892
893 int ast_bridge_timelimit(struct ast_channel *chan, struct ast_bridge_config *config,
894         char *parse, struct timeval *calldurationlimit)
895 {
896         char *stringp = ast_strdupa(parse);
897         char *limit_str, *warning_str, *warnfreq_str;
898         const char *var;
899         int play_to_caller = 0, play_to_callee = 0;
900         int delta;
901
902         limit_str = strsep(&stringp, ":");
903         warning_str = strsep(&stringp, ":");
904         warnfreq_str = strsep(&stringp, ":");
905
906         config->timelimit = atol(limit_str);
907         if (warning_str)
908                 config->play_warning = atol(warning_str);
909         if (warnfreq_str)
910                 config->warning_freq = atol(warnfreq_str);
911
912         if (!config->timelimit) {
913                 ast_log(LOG_WARNING, "Bridge does not accept L(%s), hanging up.\n", limit_str);
914                 config->timelimit = config->play_warning = config->warning_freq = 0;
915                 config->warning_sound = NULL;
916                 return -1; /* error */
917         } else if ( (delta = config->play_warning - config->timelimit) > 0) {
918                 int w = config->warning_freq;
919
920                 /*
921                  * If the first warning is requested _after_ the entire call
922                  * would end, and no warning frequency is requested, then turn
923                  * off the warning. If a warning frequency is requested, reduce
924                  * the 'first warning' time by that frequency until it falls
925                  * within the call's total time limit.
926                  *
927                  * Graphically:
928                  *                timelim->|    delta        |<-playwarning
929                  *      0__________________|_________________|
930                  *                       | w  |    |    |    |
931                  *
932                  * so the number of intervals to cut is 1+(delta-1)/w
933                  */
934                 if (w == 0) {
935                         config->play_warning = 0;
936                 } else {
937                         config->play_warning -= w * ( 1 + (delta-1)/w );
938                         if (config->play_warning < 1)
939                                 config->play_warning = config->warning_freq = 0;
940                 }
941         }
942
943         ast_channel_lock(chan);
944
945         var = pbx_builtin_getvar_helper(chan, "LIMIT_PLAYAUDIO_CALLER");
946         play_to_caller = var ? ast_true(var) : 1;
947
948         var = pbx_builtin_getvar_helper(chan, "LIMIT_PLAYAUDIO_CALLEE");
949         play_to_callee = var ? ast_true(var) : 0;
950
951         if (!play_to_caller && !play_to_callee)
952                 play_to_caller = 1;
953
954         var = pbx_builtin_getvar_helper(chan, "LIMIT_WARNING_FILE");
955         config->warning_sound = !ast_strlen_zero(var) ? ast_strdup(var) : ast_strdup("timeleft");
956
957         /* The code looking at config wants a NULL, not just "", to decide
958          * that the message should not be played, so we replace "" with NULL.
959          * Note, pbx_builtin_getvar_helper _can_ return NULL if the variable is
960          * not found.
961          */
962
963         var = pbx_builtin_getvar_helper(chan, "LIMIT_TIMEOUT_FILE");
964         config->end_sound = !ast_strlen_zero(var) ? ast_strdup(var) : NULL;
965
966         var = pbx_builtin_getvar_helper(chan, "LIMIT_CONNECT_FILE");
967         config->start_sound = !ast_strlen_zero(var) ? ast_strdup(var) : NULL;
968
969         ast_channel_unlock(chan);
970
971         /* undo effect of S(x) in case they are both used */
972         calldurationlimit->tv_sec = 0;
973         calldurationlimit->tv_usec = 0;
974
975         /* more efficient to do it like S(x) does since no advanced opts */
976         if (!config->play_warning && !config->start_sound && !config->end_sound && config->timelimit) {
977                 calldurationlimit->tv_sec = config->timelimit / 1000;
978                 calldurationlimit->tv_usec = (config->timelimit % 1000) * 1000;
979                 ast_verb(3, "Setting call duration limit to %.3lf seconds.\n",
980                         calldurationlimit->tv_sec + calldurationlimit->tv_usec / 1000000.0);
981                 play_to_caller = 0;
982                 play_to_callee = 0;
983                 config->timelimit = 0;
984                 config->play_warning = 0;
985                 config->warning_freq = 0;
986         } else {
987                 ast_verb(4, "Limit Data for this call:\n");
988                 ast_verb(4, "timelimit      = %ld ms (%.3lf s)\n", config->timelimit, config->timelimit / 1000.0);
989                 ast_verb(4, "play_warning   = %ld ms (%.3lf s)\n", config->play_warning, config->play_warning / 1000.0);
990                 ast_verb(4, "play_to_caller = %s\n", play_to_caller ? "yes" : "no");
991                 ast_verb(4, "play_to_callee = %s\n", play_to_callee ? "yes" : "no");
992                 ast_verb(4, "warning_freq   = %ld ms (%.3lf s)\n", config->warning_freq, config->warning_freq / 1000.0);
993                 ast_verb(4, "start_sound    = %s\n", S_OR(config->start_sound, ""));
994                 ast_verb(4, "warning_sound  = %s\n", config->warning_sound);
995                 ast_verb(4, "end_sound      = %s\n", S_OR(config->end_sound, ""));
996         }
997         if (play_to_caller)
998                 ast_set_flag(&(config->features_caller), AST_FEATURE_PLAY_WARNING);
999         if (play_to_callee)
1000                 ast_set_flag(&(config->features_callee), AST_FEATURE_PLAY_WARNING);
1001         return 0;
1002 }
1003
1004
1005 /*!
1006  * \brief Bridge channels
1007  * \param chan
1008  * \param data channel to bridge with.
1009  *
1010  * Split data, check we aren't bridging with ourself, check valid channel,
1011  * answer call if not already, check compatible channels, setup bridge config
1012  * now bridge call, if transfered party hangs up return to PBX extension.
1013  */
1014 static int bridge_exec(struct ast_channel *chan, const char *data)
1015 {
1016         RAII_VAR(struct ast_channel *, current_dest_chan, NULL, ao2_cleanup);
1017         char *tmp_data  = NULL;
1018         struct ast_flags opts = { 0, };
1019         struct ast_bridge_config bconfig = { { 0, }, };
1020         char *opt_args[OPT_ARG_ARRAY_SIZE];
1021         struct timeval calldurationlimit = { 0, };
1022         const char *context;
1023         const char *extension;
1024         int priority;
1025         struct ast_bridge_features chan_features;
1026         struct ast_bridge_features *peer_features;
1027         struct ast_bridge *bridge;
1028         RAII_VAR(struct ast_features_xfer_config *, xfer_cfg, NULL, ao2_cleanup);
1029
1030         AST_DECLARE_APP_ARGS(args,
1031                 AST_APP_ARG(dest_chan);
1032                 AST_APP_ARG(options);
1033         );
1034
1035         if (ast_strlen_zero(data)) {
1036                 ast_log(LOG_WARNING, "Bridge require at least 1 argument specifying the other end of the bridge\n");
1037                 return -1;
1038         }
1039
1040         tmp_data = ast_strdupa(data);
1041         AST_STANDARD_APP_ARGS(args, tmp_data);
1042         if (!ast_strlen_zero(args.options))
1043                 ast_app_parse_options(bridge_exec_options, &opts, opt_args, args.options);
1044
1045         /* make sure we have a valid end point */
1046         if (!(current_dest_chan = ast_channel_get_by_name_prefix(args.dest_chan,
1047                         strlen(args.dest_chan)))) {
1048                 ast_log(LOG_WARNING, "Bridge failed because channel %s does not exist\n",
1049                         args.dest_chan);
1050                 return 0;
1051         }
1052
1053         /* avoid bridge with ourselves */
1054         if (chan == current_dest_chan) {
1055                 ast_log(LOG_WARNING, "Unable to bridge channel %s with itself\n", ast_channel_name(chan));
1056                 return 0;
1057         }
1058
1059         if (ast_test_flag(&opts, OPT_DURATION_LIMIT)
1060                 && !ast_strlen_zero(opt_args[OPT_ARG_DURATION_LIMIT])
1061                 && ast_bridge_timelimit(chan, &bconfig, opt_args[OPT_ARG_DURATION_LIMIT], &calldurationlimit)) {
1062                 pbx_builtin_setvar_helper(chan, "BRIDGERESULT", "FAILURE");
1063                 goto done;
1064         }
1065
1066         if (ast_test_flag(&opts, OPT_CALLEE_TRANSFER))
1067                 ast_set_flag(&(bconfig.features_callee), AST_FEATURE_REDIRECT);
1068         if (ast_test_flag(&opts, OPT_CALLER_TRANSFER))
1069                 ast_set_flag(&(bconfig.features_caller), AST_FEATURE_REDIRECT);
1070         if (ast_test_flag(&opts, OPT_CALLEE_HANGUP))
1071                 ast_set_flag(&(bconfig.features_callee), AST_FEATURE_DISCONNECT);
1072         if (ast_test_flag(&opts, OPT_CALLER_HANGUP))
1073                 ast_set_flag(&(bconfig.features_caller), AST_FEATURE_DISCONNECT);
1074         if (ast_test_flag(&opts, OPT_CALLEE_MONITOR))
1075                 ast_set_flag(&(bconfig.features_callee), AST_FEATURE_AUTOMON);
1076         if (ast_test_flag(&opts, OPT_CALLER_MONITOR))
1077                 ast_set_flag(&(bconfig.features_caller), AST_FEATURE_AUTOMON);
1078         if (ast_test_flag(&opts, OPT_CALLEE_PARK))
1079                 ast_set_flag(&(bconfig.features_callee), AST_FEATURE_PARKCALL);
1080         if (ast_test_flag(&opts, OPT_CALLER_PARK))
1081                 ast_set_flag(&(bconfig.features_caller), AST_FEATURE_PARKCALL);
1082
1083         /* Setup after bridge goto location. */
1084         if (ast_test_flag(&opts, OPT_CALLEE_GO_ON)) {
1085                 ast_channel_lock(chan);
1086                 context = ast_strdupa(ast_channel_context(chan));
1087                 extension = ast_strdupa(ast_channel_exten(chan));
1088                 priority = ast_channel_priority(chan);
1089                 ast_channel_unlock(chan);
1090                 ast_bridge_set_after_go_on(current_dest_chan, context, extension, priority,
1091                         opt_args[OPT_ARG_CALLEE_GO_ON]);
1092         } else if (!ast_test_flag(&opts, OPT_CALLEE_KILL)) {
1093                 ast_channel_lock(current_dest_chan);
1094                 context = ast_strdupa(ast_channel_context(current_dest_chan));
1095                 extension = ast_strdupa(ast_channel_exten(current_dest_chan));
1096                 priority = ast_channel_priority(current_dest_chan);
1097                 ast_channel_unlock(current_dest_chan);
1098                 ast_bridge_set_after_goto(current_dest_chan, context, extension, priority);
1099         }
1100
1101         if (ast_bridge_features_init(&chan_features)) {
1102                 ast_bridge_features_cleanup(&chan_features);
1103                 goto done;
1104         }
1105
1106         peer_features = ast_bridge_features_new();
1107         if (!peer_features) {
1108                 ast_bridge_features_cleanup(&chan_features);
1109                 goto done;
1110         }
1111
1112         if (pre_bridge_setup(chan, current_dest_chan, &bconfig, &chan_features, peer_features)) {
1113                 ast_bridge_features_destroy(peer_features);
1114                 ast_bridge_features_cleanup(&chan_features);
1115                 goto done;
1116         }
1117
1118         bridge = ast_bridge_basic_new();
1119         if (!bridge) {
1120                 ast_bridge_features_destroy(peer_features);
1121                 ast_bridge_features_cleanup(&chan_features);
1122                 goto done;
1123         }
1124
1125         xfer_cfg = ast_get_chan_features_xfer_config(current_dest_chan);
1126         if (ast_bridge_add_channel(bridge, current_dest_chan, peer_features,
1127                 ast_test_flag(&opts, BRIDGE_OPT_PLAYTONE), xfer_cfg ? xfer_cfg->xfersound : NULL)) {
1128                 ast_bridge_features_destroy(peer_features);
1129                 ast_bridge_features_cleanup(&chan_features);
1130                 ast_bridge_destroy(bridge, 0);
1131                 goto done;
1132         }
1133
1134         ast_bridge_join(bridge, chan, NULL, &chan_features, NULL,
1135                 AST_BRIDGE_JOIN_PASS_REFERENCE);
1136
1137         ast_bridge_features_cleanup(&chan_features);
1138
1139         /* The bridge has ended, set BRIDGERESULT to SUCCESS. */
1140         pbx_builtin_setvar_helper(chan, "BRIDGERESULT", "SUCCESS");
1141 done:
1142         ast_free((char *) bconfig.warning_sound);
1143         ast_free((char *) bconfig.end_sound);
1144         ast_free((char *) bconfig.start_sound);
1145
1146         return 0;
1147 }
1148
1149 /*!
1150  * \internal
1151  * \brief Clean up resources on Asterisk shutdown
1152  */
1153 static void features_shutdown(void)
1154 {
1155         ast_features_config_shutdown();
1156
1157         ast_manager_unregister("Bridge");
1158
1159         ast_unregister_application(app_bridge);
1160
1161 }
1162
1163 int ast_features_init(void)
1164 {
1165         int res;
1166
1167         res = ast_features_config_init();
1168         if (res) {
1169                 return res;
1170         }
1171         res |= ast_register_application2(app_bridge, bridge_exec, NULL, NULL, NULL);
1172         res |= ast_manager_register_xml_core("Bridge", EVENT_FLAG_CALL, action_bridge);
1173
1174         if (res) {
1175                 features_shutdown();
1176         } else {
1177                 ast_register_atexit(features_shutdown);
1178         }
1179
1180         return res;
1181 }