2601a4106cd091d9097513df9b38972eb579d073
[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 /*!
643  * \brief bridge the call and set CDR
644  *
645  * \param chan The bridge considers this channel the caller.
646  * \param peer The bridge considers this channel the callee.
647  * \param config Configuration for this bridge.
648  *
649  * Set start time, check for two channels,check if monitor on
650  * check for feature activation, create new CDR
651  * \retval res on success.
652  * \retval -1 on failure to bridge.
653  */
654 int ast_bridge_call(struct ast_channel *chan, struct ast_channel *peer, struct ast_bridge_config *config)
655 {
656         int res;
657         struct ast_bridge *bridge;
658         struct ast_bridge_features chan_features;
659         struct ast_bridge_features *peer_features;
660
661         /* Setup features. */
662         res = ast_bridge_features_init(&chan_features);
663         peer_features = ast_bridge_features_new();
664         if (res || !peer_features) {
665                 ast_bridge_features_destroy(peer_features);
666                 ast_bridge_features_cleanup(&chan_features);
667                 bridge_failed_peer_goto(chan, peer);
668                 return -1;
669         }
670
671         if (pre_bridge_setup(chan, peer, config, &chan_features, peer_features)) {
672                 ast_bridge_features_destroy(peer_features);
673                 ast_bridge_features_cleanup(&chan_features);
674                 bridge_failed_peer_goto(chan, peer);
675                 return -1;
676         }
677
678         /* Create bridge */
679         bridge = ast_bridge_basic_new();
680         if (!bridge) {
681                 ast_bridge_features_destroy(peer_features);
682                 ast_bridge_features_cleanup(&chan_features);
683                 bridge_failed_peer_goto(chan, peer);
684                 return -1;
685         }
686
687         /* Put peer into the bridge */
688         if (ast_bridge_impart(bridge, peer, NULL, peer_features, 1)) {
689                 ast_bridge_destroy(bridge);
690                 ast_bridge_features_cleanup(&chan_features);
691                 bridge_failed_peer_goto(chan, peer);
692                 return -1;
693         }
694
695         /* Join bridge */
696         ast_bridge_join(bridge, chan, NULL, &chan_features, NULL, 1);
697
698         /*
699          * If the bridge was broken for a hangup that isn't real, then
700          * don't run the h extension, because the channel isn't really
701          * hung up.  This should really only happen with
702          * AST_SOFTHANGUP_ASYNCGOTO.
703          */
704         res = -1;
705         ast_channel_lock(chan);
706         if (ast_channel_softhangup_internal_flag(chan) & AST_SOFTHANGUP_ASYNCGOTO) {
707                 res = 0;
708         }
709         ast_channel_unlock(chan);
710
711         ast_bridge_features_cleanup(&chan_features);
712
713         if (res && config->end_bridge_callback) {
714                 config->end_bridge_callback(config->end_bridge_callback_data);
715         }
716
717         return res;
718 }
719
720 enum play_tone_action {
721         PLAYTONE_NONE = 0,
722         PLAYTONE_CHANNEL1 = (1 << 0),
723         PLAYTONE_CHANNEL2 = (1 << 1),
724         PLAYTONE_BOTH = PLAYTONE_CHANNEL1 | PLAYTONE_CHANNEL2,
725 };
726
727 static enum play_tone_action parse_playtone(const char *playtone_val)
728 {
729         if (ast_strlen_zero(playtone_val) || ast_false(playtone_val)) {
730                 return PLAYTONE_NONE;
731         } if (!strcasecmp(playtone_val, "channel1")) {
732                 return PLAYTONE_CHANNEL1;
733         } else if (!strcasecmp(playtone_val, "channel2") || ast_true(playtone_val)) {
734                 return PLAYTONE_CHANNEL2;
735         } else if (!strcasecmp(playtone_val, "both")) {
736                 return PLAYTONE_BOTH;
737         } else {
738                 /* Invalid input. Assume none */
739                 return PLAYTONE_NONE;
740         }
741 }
742
743 /*!
744  * \brief Bridge channels together
745  * \param s
746  * \param m
747  *
748  * Make sure valid channels were specified,
749  * send errors if any of the channels could not be found/locked, answer channels if needed,
750  * create the placeholder channels and grab the other channels
751  * make the channels compatible, send error if we fail doing so
752  * setup the bridge thread object and start the bridge.
753  *
754  * \retval 0
755  */
756 static int action_bridge(struct mansession *s, const struct message *m)
757 {
758         const char *channela = astman_get_header(m, "Channel1");
759         const char *channelb = astman_get_header(m, "Channel2");
760         enum play_tone_action playtone = parse_playtone(astman_get_header(m, "Tone"));
761         RAII_VAR(struct ast_channel *, chana, NULL, ao2_cleanup);
762         RAII_VAR(struct ast_channel *, chanb, NULL, ao2_cleanup);
763         const char *chana_exten;
764         const char *chana_context;
765         int chana_priority;
766         const char *chanb_exten;
767         const char *chanb_context;
768         int chanb_priority;
769         struct ast_bridge *bridge;
770         char buf[256];
771         RAII_VAR(struct ast_features_xfer_config *, xfer_cfg_a, NULL, ao2_cleanup);
772         RAII_VAR(struct ast_features_xfer_config *, xfer_cfg_b, NULL, ao2_cleanup);
773
774         /* make sure valid channels were specified */
775         if (ast_strlen_zero(channela) || ast_strlen_zero(channelb)) {
776                 astman_send_error(s, m, "Missing channel parameter in request");
777                 return 0;
778         }
779
780         ast_debug(1, "Performing Bridge action on %s and %s\n", channela, channelb);
781
782         /* Start with chana */
783         chana = ast_channel_get_by_name_prefix(channela, strlen(channela));
784         if (!chana) {
785                 snprintf(buf, sizeof(buf), "Channel1 does not exist: %s", channela);
786                 astman_send_error(s, m, buf);
787                 return 0;
788         }
789         xfer_cfg_a = ast_get_chan_features_xfer_config(chana);
790         ast_channel_lock(chana);
791         chana_exten = ast_strdupa(ast_channel_exten(chana));
792         chana_context = ast_strdupa(ast_channel_context(chana));
793         chana_priority = ast_channel_priority(chana);
794         if (!ast_test_flag(ast_channel_flags(chana), AST_FLAG_IN_AUTOLOOP)) {
795                 chana_priority++;
796         }
797         ast_channel_unlock(chana);
798
799         chanb = ast_channel_get_by_name_prefix(channelb, strlen(channelb));
800         if (!chanb) {
801                 snprintf(buf, sizeof(buf), "Channel2 does not exist: %s", channelb);
802                 astman_send_error(s, m, buf);
803                 return 0;
804         }
805         xfer_cfg_b = ast_get_chan_features_xfer_config(chanb);
806         ast_channel_lock(chanb);
807         chanb_exten = ast_strdupa(ast_channel_exten(chanb));
808         chanb_context = ast_strdupa(ast_channel_context(chanb));
809         chanb_priority = ast_channel_priority(chanb);
810         if (!ast_test_flag(ast_channel_flags(chanb), AST_FLAG_IN_AUTOLOOP)) {
811                 chanb_priority++;
812         }
813         ast_channel_unlock(chanb);
814
815         bridge = ast_bridge_basic_new();
816         if (!bridge) {
817                 astman_send_error(s, m, "Unable to create bridge\n");
818                 return 0;
819         }
820
821         ast_bridge_set_after_go_on(chana, chana_context, chana_exten, chana_priority, NULL);
822         if (ast_bridge_add_channel(bridge, chana, NULL, playtone & PLAYTONE_CHANNEL1, xfer_cfg_a ? xfer_cfg_a->xfersound : NULL)) {
823                 snprintf(buf, sizeof(buf), "Unable to add Channel1 to bridge: %s", ast_channel_name(chana));
824                 astman_send_error(s, m, buf);
825                 ast_bridge_destroy(bridge);
826                 return 0;
827         }
828
829         ast_bridge_set_after_go_on(chanb, chanb_context, chanb_exten, chanb_priority, NULL);
830         if (ast_bridge_add_channel(bridge, chanb, NULL, playtone & PLAYTONE_CHANNEL2, xfer_cfg_b ? xfer_cfg_b->xfersound : NULL)) {
831                 snprintf(buf, sizeof(buf), "Unable to add Channel2 to bridge: %s", ast_channel_name(chanb));
832                 astman_send_error(s, m, buf);
833                 ast_bridge_destroy(bridge);
834                 return 0;
835         }
836
837         astman_send_ack(s, m, "Channels have been bridged");
838
839         return 0;
840 }
841
842 static char *app_bridge = "Bridge";
843
844 enum {
845         BRIDGE_OPT_PLAYTONE = (1 << 0),
846         OPT_CALLEE_HANGUP =     (1 << 1),
847         OPT_CALLER_HANGUP =     (1 << 2),
848         OPT_DURATION_LIMIT = (1 << 3),
849         OPT_DURATION_STOP =     (1 << 4),
850         OPT_CALLEE_TRANSFER = (1 << 5),
851         OPT_CALLER_TRANSFER = (1 << 6),
852         OPT_CALLEE_MONITOR = (1 << 7),
853         OPT_CALLER_MONITOR = (1 << 8),
854         OPT_CALLEE_PARK = (1 << 9),
855         OPT_CALLER_PARK = (1 << 10),
856         OPT_CALLEE_KILL = (1 << 11),
857         OPT_CALLEE_GO_ON = (1 << 12),
858 };
859
860 enum {
861         OPT_ARG_DURATION_LIMIT = 0,
862         OPT_ARG_DURATION_STOP,
863         OPT_ARG_CALLEE_GO_ON,
864         /* note: this entry _MUST_ be the last one in the enum */
865         OPT_ARG_ARRAY_SIZE,
866 };
867
868 AST_APP_OPTIONS(bridge_exec_options, BEGIN_OPTIONS
869         AST_APP_OPTION('p', BRIDGE_OPT_PLAYTONE),
870         AST_APP_OPTION_ARG('F', OPT_CALLEE_GO_ON, OPT_ARG_CALLEE_GO_ON),
871         AST_APP_OPTION('h', OPT_CALLEE_HANGUP),
872         AST_APP_OPTION('H', OPT_CALLER_HANGUP),
873         AST_APP_OPTION('k', OPT_CALLEE_PARK),
874         AST_APP_OPTION('K', OPT_CALLER_PARK),
875         AST_APP_OPTION_ARG('L', OPT_DURATION_LIMIT, OPT_ARG_DURATION_LIMIT),
876         AST_APP_OPTION_ARG('S', OPT_DURATION_STOP, OPT_ARG_DURATION_STOP),
877         AST_APP_OPTION('t', OPT_CALLEE_TRANSFER),
878         AST_APP_OPTION('T', OPT_CALLER_TRANSFER),
879         AST_APP_OPTION('w', OPT_CALLEE_MONITOR),
880         AST_APP_OPTION('W', OPT_CALLER_MONITOR),
881         AST_APP_OPTION('x', OPT_CALLEE_KILL),
882 END_OPTIONS );
883
884 int ast_bridge_timelimit(struct ast_channel *chan, struct ast_bridge_config *config,
885         char *parse, struct timeval *calldurationlimit)
886 {
887         char *stringp = ast_strdupa(parse);
888         char *limit_str, *warning_str, *warnfreq_str;
889         const char *var;
890         int play_to_caller = 0, play_to_callee = 0;
891         int delta;
892
893         limit_str = strsep(&stringp, ":");
894         warning_str = strsep(&stringp, ":");
895         warnfreq_str = strsep(&stringp, ":");
896
897         config->timelimit = atol(limit_str);
898         if (warning_str)
899                 config->play_warning = atol(warning_str);
900         if (warnfreq_str)
901                 config->warning_freq = atol(warnfreq_str);
902
903         if (!config->timelimit) {
904                 ast_log(LOG_WARNING, "Bridge does not accept L(%s), hanging up.\n", limit_str);
905                 config->timelimit = config->play_warning = config->warning_freq = 0;
906                 config->warning_sound = NULL;
907                 return -1; /* error */
908         } else if ( (delta = config->play_warning - config->timelimit) > 0) {
909                 int w = config->warning_freq;
910
911                 /*
912                  * If the first warning is requested _after_ the entire call
913                  * would end, and no warning frequency is requested, then turn
914                  * off the warning. If a warning frequency is requested, reduce
915                  * the 'first warning' time by that frequency until it falls
916                  * within the call's total time limit.
917                  *
918                  * Graphically:
919                  *                timelim->|    delta        |<-playwarning
920                  *      0__________________|_________________|
921                  *                       | w  |    |    |    |
922                  *
923                  * so the number of intervals to cut is 1+(delta-1)/w
924                  */
925                 if (w == 0) {
926                         config->play_warning = 0;
927                 } else {
928                         config->play_warning -= w * ( 1 + (delta-1)/w );
929                         if (config->play_warning < 1)
930                                 config->play_warning = config->warning_freq = 0;
931                 }
932         }
933
934         ast_channel_lock(chan);
935
936         var = pbx_builtin_getvar_helper(chan, "LIMIT_PLAYAUDIO_CALLER");
937         play_to_caller = var ? ast_true(var) : 1;
938
939         var = pbx_builtin_getvar_helper(chan, "LIMIT_PLAYAUDIO_CALLEE");
940         play_to_callee = var ? ast_true(var) : 0;
941
942         if (!play_to_caller && !play_to_callee)
943                 play_to_caller = 1;
944
945         var = pbx_builtin_getvar_helper(chan, "LIMIT_WARNING_FILE");
946         config->warning_sound = !ast_strlen_zero(var) ? ast_strdup(var) : ast_strdup("timeleft");
947
948         /* The code looking at config wants a NULL, not just "", to decide
949          * that the message should not be played, so we replace "" with NULL.
950          * Note, pbx_builtin_getvar_helper _can_ return NULL if the variable is
951          * not found.
952          */
953
954         var = pbx_builtin_getvar_helper(chan, "LIMIT_TIMEOUT_FILE");
955         config->end_sound = !ast_strlen_zero(var) ? ast_strdup(var) : NULL;
956
957         var = pbx_builtin_getvar_helper(chan, "LIMIT_CONNECT_FILE");
958         config->start_sound = !ast_strlen_zero(var) ? ast_strdup(var) : NULL;
959
960         ast_channel_unlock(chan);
961
962         /* undo effect of S(x) in case they are both used */
963         calldurationlimit->tv_sec = 0;
964         calldurationlimit->tv_usec = 0;
965
966         /* more efficient to do it like S(x) does since no advanced opts */
967         if (!config->play_warning && !config->start_sound && !config->end_sound && config->timelimit) {
968                 calldurationlimit->tv_sec = config->timelimit / 1000;
969                 calldurationlimit->tv_usec = (config->timelimit % 1000) * 1000;
970                 ast_verb(3, "Setting call duration limit to %.3lf seconds.\n",
971                         calldurationlimit->tv_sec + calldurationlimit->tv_usec / 1000000.0);
972                 play_to_caller = 0;
973                 play_to_callee = 0;
974                 config->timelimit = 0;
975                 config->play_warning = 0;
976                 config->warning_freq = 0;
977         } else {
978                 ast_verb(4, "Limit Data for this call:\n");
979                 ast_verb(4, "timelimit      = %ld ms (%.3lf s)\n", config->timelimit, config->timelimit / 1000.0);
980                 ast_verb(4, "play_warning   = %ld ms (%.3lf s)\n", config->play_warning, config->play_warning / 1000.0);
981                 ast_verb(4, "play_to_caller = %s\n", play_to_caller ? "yes" : "no");
982                 ast_verb(4, "play_to_callee = %s\n", play_to_callee ? "yes" : "no");
983                 ast_verb(4, "warning_freq   = %ld ms (%.3lf s)\n", config->warning_freq, config->warning_freq / 1000.0);
984                 ast_verb(4, "start_sound    = %s\n", S_OR(config->start_sound, ""));
985                 ast_verb(4, "warning_sound  = %s\n", config->warning_sound);
986                 ast_verb(4, "end_sound      = %s\n", S_OR(config->end_sound, ""));
987         }
988         if (play_to_caller)
989                 ast_set_flag(&(config->features_caller), AST_FEATURE_PLAY_WARNING);
990         if (play_to_callee)
991                 ast_set_flag(&(config->features_callee), AST_FEATURE_PLAY_WARNING);
992         return 0;
993 }
994
995
996 /*!
997  * \brief Bridge channels
998  * \param chan
999  * \param data channel to bridge with.
1000  *
1001  * Split data, check we aren't bridging with ourself, check valid channel,
1002  * answer call if not already, check compatible channels, setup bridge config
1003  * now bridge call, if transfered party hangs up return to PBX extension.
1004  */
1005 static int bridge_exec(struct ast_channel *chan, const char *data)
1006 {
1007         RAII_VAR(struct ast_channel *, current_dest_chan, NULL, ao2_cleanup);
1008         char *tmp_data  = NULL;
1009         struct ast_flags opts = { 0, };
1010         struct ast_bridge_config bconfig = { { 0, }, };
1011         char *opt_args[OPT_ARG_ARRAY_SIZE];
1012         struct timeval calldurationlimit = { 0, };
1013         const char *context;
1014         const char *extension;
1015         int priority;
1016         struct ast_bridge_features chan_features;
1017         struct ast_bridge_features *peer_features;
1018         struct ast_bridge *bridge;
1019         RAII_VAR(struct ast_features_xfer_config *, xfer_cfg, NULL, ao2_cleanup);
1020
1021         AST_DECLARE_APP_ARGS(args,
1022                 AST_APP_ARG(dest_chan);
1023                 AST_APP_ARG(options);
1024         );
1025
1026         if (ast_strlen_zero(data)) {
1027                 ast_log(LOG_WARNING, "Bridge require at least 1 argument specifying the other end of the bridge\n");
1028                 return -1;
1029         }
1030
1031         tmp_data = ast_strdupa(data);
1032         AST_STANDARD_APP_ARGS(args, tmp_data);
1033         if (!ast_strlen_zero(args.options))
1034                 ast_app_parse_options(bridge_exec_options, &opts, opt_args, args.options);
1035
1036         /* make sure we have a valid end point */
1037         if (!(current_dest_chan = ast_channel_get_by_name_prefix(args.dest_chan,
1038                         strlen(args.dest_chan)))) {
1039                 ast_log(LOG_WARNING, "Bridge failed because channel %s does not exist\n",
1040                         args.dest_chan);
1041                 return 0;
1042         }
1043
1044         /* avoid bridge with ourselves */
1045         if (chan == current_dest_chan) {
1046                 ast_log(LOG_WARNING, "Unable to bridge channel %s with itself\n", ast_channel_name(chan));
1047                 return 0;
1048         }
1049
1050         if (ast_test_flag(&opts, OPT_DURATION_LIMIT)
1051                 && !ast_strlen_zero(opt_args[OPT_ARG_DURATION_LIMIT])
1052                 && ast_bridge_timelimit(chan, &bconfig, opt_args[OPT_ARG_DURATION_LIMIT], &calldurationlimit)) {
1053                 pbx_builtin_setvar_helper(chan, "BRIDGERESULT", "FAILURE");
1054                 goto done;
1055         }
1056
1057         if (ast_test_flag(&opts, OPT_CALLEE_TRANSFER))
1058                 ast_set_flag(&(bconfig.features_callee), AST_FEATURE_REDIRECT);
1059         if (ast_test_flag(&opts, OPT_CALLER_TRANSFER))
1060                 ast_set_flag(&(bconfig.features_caller), AST_FEATURE_REDIRECT);
1061         if (ast_test_flag(&opts, OPT_CALLEE_HANGUP))
1062                 ast_set_flag(&(bconfig.features_callee), AST_FEATURE_DISCONNECT);
1063         if (ast_test_flag(&opts, OPT_CALLER_HANGUP))
1064                 ast_set_flag(&(bconfig.features_caller), AST_FEATURE_DISCONNECT);
1065         if (ast_test_flag(&opts, OPT_CALLEE_MONITOR))
1066                 ast_set_flag(&(bconfig.features_callee), AST_FEATURE_AUTOMON);
1067         if (ast_test_flag(&opts, OPT_CALLER_MONITOR))
1068                 ast_set_flag(&(bconfig.features_caller), AST_FEATURE_AUTOMON);
1069         if (ast_test_flag(&opts, OPT_CALLEE_PARK))
1070                 ast_set_flag(&(bconfig.features_callee), AST_FEATURE_PARKCALL);
1071         if (ast_test_flag(&opts, OPT_CALLER_PARK))
1072                 ast_set_flag(&(bconfig.features_caller), AST_FEATURE_PARKCALL);
1073
1074         /* Setup after bridge goto location. */
1075         if (ast_test_flag(&opts, OPT_CALLEE_GO_ON)) {
1076                 ast_channel_lock(chan);
1077                 context = ast_strdupa(ast_channel_context(chan));
1078                 extension = ast_strdupa(ast_channel_exten(chan));
1079                 priority = ast_channel_priority(chan);
1080                 ast_channel_unlock(chan);
1081                 ast_bridge_set_after_go_on(current_dest_chan, context, extension, priority,
1082                         opt_args[OPT_ARG_CALLEE_GO_ON]);
1083         } else if (!ast_test_flag(&opts, OPT_CALLEE_KILL)) {
1084                 ast_channel_lock(current_dest_chan);
1085                 context = ast_strdupa(ast_channel_context(current_dest_chan));
1086                 extension = ast_strdupa(ast_channel_exten(current_dest_chan));
1087                 priority = ast_channel_priority(current_dest_chan);
1088                 ast_channel_unlock(current_dest_chan);
1089                 ast_bridge_set_after_goto(current_dest_chan, context, extension, priority);
1090         }
1091
1092         if (ast_bridge_features_init(&chan_features)) {
1093                 ast_bridge_features_cleanup(&chan_features);
1094                 goto done;
1095         }
1096
1097         peer_features = ast_bridge_features_new();
1098         if (!peer_features) {
1099                 ast_bridge_features_cleanup(&chan_features);
1100                 goto done;
1101         }
1102
1103         if (pre_bridge_setup(chan, current_dest_chan, &bconfig, &chan_features, peer_features)) {
1104                 ast_bridge_features_destroy(peer_features);
1105                 ast_bridge_features_cleanup(&chan_features);
1106                 goto done;
1107         }
1108
1109         bridge = ast_bridge_basic_new();
1110         if (!bridge) {
1111                 ast_bridge_features_destroy(peer_features);
1112                 ast_bridge_features_cleanup(&chan_features);
1113                 goto done;
1114         }
1115
1116         xfer_cfg = ast_get_chan_features_xfer_config(current_dest_chan);
1117         if (ast_bridge_add_channel(bridge, current_dest_chan, peer_features,
1118                 ast_test_flag(&opts, BRIDGE_OPT_PLAYTONE), xfer_cfg ? xfer_cfg->xfersound : NULL)) {
1119                 ast_bridge_features_destroy(peer_features);
1120                 ast_bridge_features_cleanup(&chan_features);
1121                 ast_bridge_destroy(bridge);
1122                 goto done;
1123         }
1124
1125         ast_bridge_join(bridge, chan, NULL, &chan_features, NULL, 1);
1126
1127         ast_bridge_features_cleanup(&chan_features);
1128
1129         /* The bridge has ended, set BRIDGERESULT to SUCCESS. */
1130         pbx_builtin_setvar_helper(chan, "BRIDGERESULT", "SUCCESS");
1131 done:
1132         ast_free((char *) bconfig.warning_sound);
1133         ast_free((char *) bconfig.end_sound);
1134         ast_free((char *) bconfig.start_sound);
1135
1136         return 0;
1137 }
1138
1139 /*!
1140  * \internal
1141  * \brief Clean up resources on Asterisk shutdown
1142  */
1143 static void features_shutdown(void)
1144 {
1145         ast_features_config_shutdown();
1146
1147         ast_manager_unregister("Bridge");
1148
1149         ast_unregister_application(app_bridge);
1150
1151 }
1152
1153 int ast_features_init(void)
1154 {
1155         int res;
1156
1157         res = ast_features_config_init();
1158         if (res) {
1159                 return res;
1160         }
1161         res |= ast_register_application2(app_bridge, bridge_exec, NULL, NULL, NULL);
1162         res |= ast_manager_register_xml_core("Bridge", EVENT_FLAG_CALL, action_bridge);
1163
1164         if (res) {
1165                 features_shutdown();
1166         } else {
1167                 ast_register_atexit(features_shutdown);
1168         }
1169
1170         return res;
1171 }