Asterisk - The Open Source Telephony Project  21.4.1
bridge_channel.c
Go to the documentation of this file.
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 2007 - 2009, Digium, Inc.
5  *
6  * Joshua Colp <jcolp@digium.com>
7  *
8  * See http://www.asterisk.org for more information about
9  * the Asterisk project. Please do not directly contact
10  * any of the maintainers of this project for assistance;
11  * the project provides a web site, mailing lists and IRC
12  * channels for your use.
13  *
14  * This program is free software, distributed under the terms of
15  * the GNU General Public License Version 2. See the LICENSE file
16  * at the top of the source tree.
17  */
18 
19 /*! \file
20  *
21  * \brief Bridging Channel API
22  *
23  * \author Joshua Colp <jcolp@digium.com>
24  * \author Richard Mudgett <rmudgett@digium.com>
25  * \author Matt Jordan <mjordan@digium.com>
26  *
27  */
28 
29 /*** MODULEINFO
30  <support_level>core</support_level>
31  ***/
32 
33 #include "asterisk.h"
34 
35 #include <signal.h>
36 
37 #include "asterisk/heap.h"
38 #include "asterisk/alertpipe.h"
39 #include "asterisk/astobj2.h"
40 #include "asterisk/stringfields.h"
41 #include "asterisk/app.h"
42 #include "asterisk/pbx.h"
43 #include "asterisk/channel.h"
44 #include "asterisk/timing.h"
45 #include "asterisk/bridge.h"
47 #include "asterisk/bridge_after.h"
50 #include "asterisk/stasis_bridges.h"
51 #include "asterisk/stasis_channels.h"
52 #include "asterisk/musiconhold.h"
53 #include "asterisk/features_config.h"
54 #include "asterisk/parking.h"
55 #include "asterisk/causes.h"
56 #include "asterisk/test.h"
57 #include "asterisk/sem.h"
58 #include "asterisk/stream.h"
59 #include "asterisk/message.h"
60 #include "asterisk/core_local.h"
61 
62 /*!
63  * \brief Used to queue an action frame onto a bridge channel and write an action frame into a bridge.
64  * \since 12.0.0
65  *
66  * \param bridge_channel Which channel work with.
67  * \param action Type of bridge action frame.
68  * \param data Frame payload data to pass.
69  * \param datalen Frame payload data length to pass.
70  *
71  * \retval 0 on success.
72  * \retval -1 on error.
73  */
74 typedef int (*ast_bridge_channel_post_action_data)(struct ast_bridge_channel *bridge_channel, enum bridge_channel_action_type action, const void *data, size_t datalen);
75 
76 /*!
77  * \brief Counter used for assigning synchronous bridge action IDs
78  */
79 static int sync_ids;
80 
81 /*!
82  * \brief Frame payload for synchronous bridge actions.
83  *
84  * The payload serves as a wrapper around the actual payload of the
85  * frame, with the addition of an id used to find the associated
86  * bridge_sync object.
87  */
88 struct sync_payload {
89  /*! Unique ID for this synchronous action */
90  unsigned int id;
91  /*! Actual frame data to process */
92  unsigned char data[0];
93 };
94 
95 /*!
96  * \brief Synchronous bridge action object.
97  *
98  * Synchronous bridge actions require the ability for one thread to wait
99  * and for another thread to indicate that the action has completed. This
100  * structure facilitates that goal by providing synchronization structures.
101  */
102 struct bridge_sync {
103  /*! Unique ID of this synchronization object. Corresponds with ID in synchronous frame payload */
104  unsigned int id;
105  /*! Semaphore used for synchronization */
106  struct ast_sem sem;
107  /*! Pointer to next entry in the list */
109 };
110 
111 /*!
112  * \brief List holding active synchronous action objects.
113  */
115 
116 /*!
117  * \brief Initialize a synchronous bridge object.
118  *
119  * This both initializes the structure and adds it to the list of
120  * synchronization structures.
121  *
122  * \param sync_struct The synchronization object to initialize.
123  * \param id ID to assign to the synchronization object.
124  */
125 static void bridge_sync_init(struct bridge_sync *sync_struct, unsigned int id)
126 {
127  memset(sync_struct, 0, sizeof(*sync_struct));
128  sync_struct->id = id;
129  ast_sem_init(&sync_struct->sem, 0, 0);
130 
131  AST_RWLIST_WRLOCK(&sync_structs);
132  AST_RWLIST_INSERT_TAIL(&sync_structs, sync_struct, list);
133  AST_RWLIST_UNLOCK(&sync_structs);
134 }
135 
136 /*!
137  * \brief Clean up a synchronization bridge object.
138  *
139  * This frees fields within the synchronization object and removes
140  * it from the list of active synchronization objects.
141  *
142  * Since synchronization objects are stack-allocated, it is vital
143  * that this is called before the synchronization object goes
144  * out of scope.
145  *
146  * \param sync_struct Synchronization object to clean up.
147  */
148 static void bridge_sync_cleanup(struct bridge_sync *sync_struct)
149 {
150  struct bridge_sync *iter;
151 
154  if (iter->id == sync_struct->id) {
156  break;
157  }
158  }
161 
162  ast_sem_destroy(&sync_struct->sem);
163 }
164 
165 /*!
166  * \brief Failsafe for synchronous bridge action waiting.
167  *
168  * When waiting for a synchronous bridge action to complete,
169  * if there is a frame resource leak somewhere, it is possible
170  * that we will never get notified that the synchronous action
171  * completed.
172  *
173  * If a significant amount of time passes, then we will abandon
174  * waiting for the synchrnous bridge action to complete.
175  *
176  * This constant represents the number of milliseconds we will
177  * wait for the bridge action to complete.
178  */
179 #define PLAYBACK_TIMEOUT (600 * 1000)
180 
181 /*!
182  * \brief Wait for a synchronous bridge action to complete.
183  *
184  * \param sync_struct Synchronization object corresponding to the bridge action.
185  */
186 static void bridge_sync_wait(struct bridge_sync *sync_struct)
187 {
188  struct timeval timeout_val = ast_tvadd(ast_tvnow(), ast_samp2tv(PLAYBACK_TIMEOUT, 1000));
189  struct timespec timeout_spec = {
190  .tv_sec = timeout_val.tv_sec,
191  .tv_nsec = timeout_val.tv_usec * 1000,
192  };
193 
194  ast_sem_timedwait(&sync_struct->sem, &timeout_spec);
195 }
196 
197 /*!
198  * \brief Signal that waiting for a synchronous bridge action is no longer necessary.
199  *
200  * This may occur for several reasons
201  * \li The synchronous bridge action has completed.
202  * \li The bridge channel has been removed from the bridge.
203  * \li The synchronous bridge action could not be queued.
204  *
205  * \param sync_struct Synchronization object corresponding to the bridge action.
206  */
207 static void bridge_sync_signal(struct bridge_sync *sync_struct)
208 {
209  ast_sem_post(&sync_struct->sem);
210 }
211 
213 {
214  struct ast_channel *chan;
215 
216  ao2_lock(bridge_channel);
217  chan = ao2_bump(bridge_channel->chan);
218  ao2_unlock(bridge_channel);
219 
220  return chan;
221 }
222 
224 {
225  struct ast_bridge *bridge;
226 
227  for (;;) {
228  /* Safely get the bridge pointer */
229  ast_bridge_channel_lock(bridge_channel);
230  bridge = bridge_channel->bridge;
231  ao2_ref(bridge, +1);
232  ast_bridge_channel_unlock(bridge_channel);
233 
234  /* Lock the bridge and see if it is still the bridge we need to lock. */
235  ast_bridge_lock(bridge);
236  if (bridge == bridge_channel->bridge) {
237  ao2_ref(bridge, -1);
238  return;
239  }
240  ast_bridge_unlock(bridge);
241  ao2_ref(bridge, -1);
242  }
243 }
244 
245 int ast_bridge_channel_notify_talking(struct ast_bridge_channel *bridge_channel, int started_talking)
246 {
247  struct ast_frame action = {
249  .subclass.integer = started_talking
251  };
252 
253  return ast_bridge_channel_queue_frame(bridge_channel, &action);
254 }
255 
256 /*!
257  * \internal
258  * \brief Poke the bridge_channel thread
259  */
260 static void bridge_channel_poke(struct ast_bridge_channel *bridge_channel)
261 {
262  if (!pthread_equal(pthread_self(), bridge_channel->thread)) {
263  /* Wake up the bridge channel thread. */
264  ast_queue_frame(bridge_channel->chan, &ast_null_frame);
265  }
266 }
267 
268 /*!
269  * \internal
270  * \brief Set actual cause on channel.
271  * \since 12.0.0
272  *
273  * \param chan Channel to set cause.
274  * \param cause Cause to set on channel.
275  * If cause <= 0 then use cause on channel if cause still <= 0 use AST_CAUSE_NORMAL_CLEARING.
276  *
277  * \return Actual cause set on channel.
278  */
279 static int channel_set_cause(struct ast_channel *chan, int cause)
280 {
281  ast_channel_lock(chan);
282  if (cause <= 0) {
283  cause = ast_channel_hangupcause(chan);
284  if (cause <= 0) {
285  cause = AST_CAUSE_NORMAL_CLEARING;
286  }
287  }
288  ast_channel_hangupcause_set(chan, cause);
289  ast_channel_unlock(chan);
290  return cause;
291 }
292 
293 void ast_bridge_channel_leave_bridge_nolock(struct ast_bridge_channel *bridge_channel, enum bridge_channel_state new_state, int cause)
294 {
295  if (bridge_channel->state != BRIDGE_CHANNEL_STATE_WAIT) {
296  return;
297  }
298 
299  ast_debug(1, "Setting %p(%s) state from:%u to:%u\n",
300  bridge_channel, ast_channel_name(bridge_channel->chan), bridge_channel->state,
301  new_state);
302 
303  channel_set_cause(bridge_channel->chan, cause);
304 
305  ast_channel_lock(bridge_channel->chan);
306  ast_bridge_vars_set(bridge_channel->chan, NULL, NULL);
307  ast_channel_unlock(bridge_channel->chan);
308 
309  /* Change the state on the bridge channel */
310  bridge_channel->state = new_state;
311 
312  bridge_channel_poke(bridge_channel);
313 }
314 
315 void ast_bridge_channel_leave_bridge(struct ast_bridge_channel *bridge_channel, enum bridge_channel_state new_state, int cause)
316 {
317  ast_bridge_channel_lock(bridge_channel);
318  ast_bridge_channel_leave_bridge_nolock(bridge_channel, new_state, cause);
319  ast_bridge_channel_unlock(bridge_channel);
320 }
321 
323 {
324  struct ast_bridge *bridge = bridge_channel->bridge;
325  struct ast_bridge_channel *other = NULL;
326 
327  if (bridge_channel->in_bridge && bridge->num_channels == 2) {
328  AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
329  if (other != bridge_channel) {
330  break;
331  }
332  }
333  }
334 
335  return other;
336 }
337 
339 {
340  ast_assert(bridge_channel->read_format != NULL);
341  ast_assert(bridge_channel->write_format != NULL);
342 
343  ast_channel_lock(bridge_channel->chan);
344 
345  /* Restore original formats of the channel as they came in */
346  if (ast_format_cmp(ast_channel_readformat(bridge_channel->chan), bridge_channel->read_format) == AST_FORMAT_CMP_NOT_EQUAL) {
347  ast_debug(1, "Bridge is returning %p(%s) to read format %s\n",
348  bridge_channel, ast_channel_name(bridge_channel->chan),
349  ast_format_get_name(bridge_channel->read_format));
350  if (ast_set_read_format(bridge_channel->chan, bridge_channel->read_format)) {
351  ast_debug(1, "Bridge failed to return %p(%s) to read format %s\n",
352  bridge_channel, ast_channel_name(bridge_channel->chan),
353  ast_format_get_name(bridge_channel->read_format));
354  }
355  }
356  if (ast_format_cmp(ast_channel_writeformat(bridge_channel->chan), bridge_channel->write_format) == AST_FORMAT_CMP_NOT_EQUAL) {
357  ast_debug(1, "Bridge is returning %p(%s) to write format %s\n",
358  bridge_channel, ast_channel_name(bridge_channel->chan),
359  ast_format_get_name(bridge_channel->write_format));
360  if (ast_set_write_format(bridge_channel->chan, bridge_channel->write_format)) {
361  ast_debug(1, "Bridge failed to return %p(%s) to write format %s\n",
362  bridge_channel, ast_channel_name(bridge_channel->chan),
363  ast_format_get_name(bridge_channel->write_format));
364  }
365  }
366 
367  ast_channel_unlock(bridge_channel->chan);
368 }
369 
370 struct ast_bridge *ast_bridge_channel_merge_inhibit(struct ast_bridge_channel *bridge_channel, int request)
371 {
372  struct ast_bridge *bridge;
373 
374  ast_bridge_channel_lock_bridge(bridge_channel);
375  bridge = bridge_channel->bridge;
376  ao2_ref(bridge, +1);
377  bridge_merge_inhibit_nolock(bridge, request);
378  ast_bridge_unlock(bridge);
379  return bridge;
380 }
381 
382 void ast_bridge_channel_update_linkedids(struct ast_bridge_channel *bridge_channel, struct ast_bridge_channel *swap)
383 {
384  struct ast_bridge_channel *other;
385  struct ast_bridge *bridge = bridge_channel->bridge;
386  struct ast_channel *oldest_linkedid_chan = bridge_channel->chan;
387 
388  AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
389  if (other == swap) {
390  continue;
391  }
392  oldest_linkedid_chan = ast_channel_internal_oldest_linkedid(
393  oldest_linkedid_chan, other->chan);
394  }
395 
396  ast_channel_lock(bridge_channel->chan);
397  ast_channel_internal_copy_linkedid(bridge_channel->chan, oldest_linkedid_chan);
398  ast_channel_unlock(bridge_channel->chan);
399  AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
400  if (other == swap) {
401  continue;
402  }
403  ast_channel_lock(other->chan);
404  ast_channel_internal_copy_linkedid(other->chan, oldest_linkedid_chan);
405  ast_channel_unlock(other->chan);
406  }
407 }
408 
409 /*!
410  * \internal
411  * \brief Set dest's empty peeraccount with the src's non-empty accountcode.
412  * \since 12.5.0
413  *
414  * \param dest Channel to update peeraccount.
415  * \param src Channel to get accountcode from.
416  *
417  * \note Both channels are already locked.
418  */
419 static void channel_fill_empty_peeraccount(struct ast_channel *dest, struct ast_channel *src)
420 {
421  if (ast_strlen_zero(ast_channel_peeraccount(dest))
422  && !ast_strlen_zero(ast_channel_accountcode(src))) {
423  ast_debug(1, "Setting channel %s peeraccount with channel %s accountcode '%s'.\n",
424  ast_channel_name(dest),
425  ast_channel_name(src), ast_channel_accountcode(src));
426  ast_channel_peeraccount_set(dest, ast_channel_accountcode(src));
427  }
428 }
429 
430 /*!
431  * \internal
432  * \brief Set dest's empty accountcode with the src's non-empty peeraccount.
433  * \since 12.5.0
434  *
435  * \param dest Channel to update accountcode.
436  * \param src Channel to get peeraccount from.
437  *
438  * \note Both channels are already locked.
439  */
440 static void channel_fill_empty_accountcode(struct ast_channel *dest, struct ast_channel *src)
441 {
442  if (ast_strlen_zero(ast_channel_accountcode(dest))
443  && !ast_strlen_zero(ast_channel_peeraccount(src))) {
444  ast_debug(1, "Setting channel %s accountcode with channel %s peeraccount '%s'.\n",
445  ast_channel_name(dest),
446  ast_channel_name(src), ast_channel_peeraccount(src));
447  ast_channel_accountcode_set(dest, ast_channel_peeraccount(src));
448  }
449 }
450 
451 /*!
452  * \internal
453  * \brief Set empty peeraccount and accountcode in a channel from the other channel.
454  * \since 12.5.0
455  *
456  * \param c0 First bridge channel to update.
457  * \param c1 Second bridge channel to update.
458  *
459  * \note Both channels are already locked.
460  */
461 static void channel_set_empty_accountcodes(struct ast_channel *c0, struct ast_channel *c1)
462 {
463  /* Set empty peeraccount from the other channel's accountcode. */
464  channel_fill_empty_peeraccount(c0, c1);
465  channel_fill_empty_peeraccount(c1, c0);
466 
467  /* Set empty accountcode from the other channel's peeraccount. */
468  channel_fill_empty_accountcode(c0, c1);
469  channel_fill_empty_accountcode(c1, c0);
470 }
471 
472 /*!
473  * \internal
474  * \brief Update dest's peeraccount with the src's different accountcode.
475  * \since 12.5.0
476  *
477  * \param dest Channel to update peeraccount.
478  * \param src Channel to get accountcode from.
479  *
480  * \note Both channels are already locked.
481  */
482 static void channel_update_peeraccount(struct ast_channel *dest, struct ast_channel *src)
483 {
484  if (strcmp(ast_channel_accountcode(src), ast_channel_peeraccount(dest))) {
485  ast_debug(1, "Changing channel %s peeraccount '%s' to match channel %s accountcode '%s'.\n",
486  ast_channel_name(dest), ast_channel_peeraccount(dest),
487  ast_channel_name(src), ast_channel_accountcode(src));
488  ast_channel_peeraccount_set(dest, ast_channel_accountcode(src));
489  }
490 }
491 
492 /*!
493  * \internal
494  * \brief Update peeraccounts to match the other channel's accountcode.
495  * \since 12.5.0
496  *
497  * \param c0 First channel to update.
498  * \param c1 Second channel to update.
499  *
500  * \note Both channels are already locked.
501  */
502 static void channel_update_peeraccounts(struct ast_channel *c0, struct ast_channel *c1)
503 {
504  channel_update_peeraccount(c0, c1);
505  channel_update_peeraccount(c1, c0);
506 }
507 
508 /*!
509  * \internal
510  * \brief Update channel accountcodes because a channel is joining a bridge.
511  * \since 12.5.0
512  *
513  * \param joining Channel joining the bridge.
514  * \param swap Channel being replaced by the joining channel. May be NULL.
515  *
516  * \note The bridge must be locked prior to calling this function.
517  */
518 static void bridge_channel_update_accountcodes_joining(struct ast_bridge_channel *joining, struct ast_bridge_channel *swap)
519 {
520  struct ast_bridge *bridge = joining->bridge;
521  struct ast_bridge_channel *other;
522  unsigned int swap_in_bridge = 0;
523  unsigned int will_be_two_party;
524 
525  /*
526  * Only update the peeraccount to match if the joining channel
527  * will make it a two party bridge.
528  */
529  if (bridge->num_channels <= 2 && swap) {
530  AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
531  if (other == swap) {
532  swap_in_bridge = 1;
533  break;
534  }
535  }
536  }
537  will_be_two_party = (1 == bridge->num_channels - swap_in_bridge);
538 
539  AST_LIST_TRAVERSE(&bridge->channels, other, entry) {
540  if (other == swap) {
541  continue;
542  }
543  ast_assert(joining != other);
544  ast_channel_lock_both(joining->chan, other->chan);
545  channel_set_empty_accountcodes(joining->chan, other->chan);
546  if (will_be_two_party) {
547  channel_update_peeraccounts(joining->chan, other->chan);
548  }
549  ast_channel_unlock(joining->chan);
550  ast_channel_unlock(other->chan);
551  }
552 }
553 
554 /*!
555  * \internal
556  * \brief Update channel peeraccount codes because a channel has left a bridge.
557  * \since 12.5.0
558  *
559  * \param leaving Channel leaving the bridge. (Has already been removed actually)
560  *
561  * \note The bridge must be locked prior to calling this function.
562  */
563 static void bridge_channel_update_accountcodes_leaving(struct ast_bridge_channel *leaving)
564 {
565  struct ast_bridge *bridge = leaving->bridge;
566  struct ast_bridge_channel *first;
567  struct ast_bridge_channel *second;
568 
569  if (bridge->num_channels != 2 || bridge->dissolved) {
570  return;
571  }
572 
573  first = AST_LIST_FIRST(&bridge->channels);
574  second = AST_LIST_LAST(&bridge->channels);
575  ast_assert(first && first != second);
576  ast_channel_lock_both(first->chan, second->chan);
577  channel_set_empty_accountcodes(first->chan, second->chan);
578  channel_update_peeraccounts(first->chan, second->chan);
579  ast_channel_unlock(second->chan);
580  ast_channel_unlock(first->chan);
581 }
582 
583 void ast_bridge_channel_update_accountcodes(struct ast_bridge_channel *joining, struct ast_bridge_channel *leaving)
584 {
585  if (joining) {
586  bridge_channel_update_accountcodes_joining(joining, leaving);
587  } else {
588  bridge_channel_update_accountcodes_leaving(leaving);
589  }
590 }
591 
592 void ast_bridge_channel_kick(struct ast_bridge_channel *bridge_channel, int cause)
593 {
594  struct ast_bridge_features *features = bridge_channel->features;
595  struct ast_bridge_hook *hook;
596  struct ao2_iterator iter;
597 
598  ast_bridge_channel_lock(bridge_channel);
599  if (bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {
600  channel_set_cause(bridge_channel->chan, cause);
601  cause = 0;
602  }
603  ast_bridge_channel_unlock(bridge_channel);
604 
605  /* Run any hangup hooks. */
606  iter = ao2_iterator_init(features->other_hooks, 0);
607  for (; (hook = ao2_iterator_next(&iter)); ao2_ref(hook, -1)) {
608  int remove_me;
609 
610  if (hook->type != AST_BRIDGE_HOOK_TYPE_HANGUP) {
611  continue;
612  }
613  remove_me = hook->callback(bridge_channel, hook->hook_pvt);
614  if (remove_me) {
615  ast_debug(1, "Hangup hook %p is being removed from %p(%s)\n",
616  hook, bridge_channel, ast_channel_name(bridge_channel->chan));
617  ao2_unlink(features->other_hooks, hook);
618  }
619  }
620  ao2_iterator_destroy(&iter);
621 
622  /* Default hangup action. */
624 }
625 
626 /*!
627  * \internal
628  * \brief Write an \ref ast_frame into the bridge
629  * \since 12.0.0
630  *
631  * \param bridge_channel Which channel is queueing the frame.
632  * \param frame The frame to write into the bridge
633  *
634  * \retval 0 on success.
635  * \retval -1 on error.
636  */
637 static int bridge_channel_write_frame(struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
638 {
639  const struct ast_control_t38_parameters *t38_parameters;
640  int unmapped_stream_num;
641  int deferred;
642 
643  ast_assert(frame->frametype != AST_FRAME_BRIDGE_ACTION_SYNC);
644 
645  ast_bridge_channel_lock_bridge(bridge_channel);
646 
647  /*
648  * Map the frame to the bridge.
649  * We need to lock the bridge_channel to make sure that bridge_channel->chan
650  * isn't NULL and keep it locked while we do multistream processing.
651  */
652  ast_bridge_channel_lock(bridge_channel);
653  if (bridge_channel->chan && ast_channel_is_multistream(bridge_channel->chan)) {
654  unmapped_stream_num = frame->stream_num;
655  switch (frame->frametype) {
656  case AST_FRAME_VOICE:
657  case AST_FRAME_VIDEO:
658  case AST_FRAME_TEXT:
659  case AST_FRAME_IMAGE:
660  case AST_FRAME_RTCP:
661  /* These frames need to be mapped to an appropriate write stream */
662  if (frame->stream_num < 0) {
663  /* Map to default stream */
664  frame->stream_num = -1;
665  break;
666  }
667  if (frame->stream_num < (int)AST_VECTOR_SIZE(&bridge_channel->stream_map.to_bridge)) {
668  frame->stream_num = AST_VECTOR_GET(
669  &bridge_channel->stream_map.to_bridge, frame->stream_num);
670  if (0 <= frame->stream_num) {
671  break;
672  }
673  }
674  ast_bridge_channel_unlock(bridge_channel);
675  ast_bridge_unlock(bridge_channel->bridge);
676  /*
677  * Ignore frame because we don't know how to map the frame
678  * or the bridge is not expecting any media from that
679  * stream.
680  */
681  return 0;
683  case AST_FRAME_DTMF_END:
684  /*
685  * XXX It makes sense that DTMF could be on any audio stream.
686  * For now we will only put it on the default audio stream.
687  */
688  default:
689  frame->stream_num = -1;
690  break;
691  }
692  } else {
693  unmapped_stream_num = -1;
694  frame->stream_num = -1;
695  }
696  ast_bridge_channel_unlock(bridge_channel);
697 
698  deferred = bridge_channel->bridge->technology->write(bridge_channel->bridge, bridge_channel, frame);
699  if (deferred) {
700  struct ast_frame *dup;
701 
702  dup = ast_frdup(frame);
703  if (dup) {
704  /*
705  * We have to unmap the deferred frame so it comes back
706  * in like a new frame.
707  */
708  dup->stream_num = unmapped_stream_num;
709  ast_bridge_channel_lock(bridge_channel);
710  AST_LIST_INSERT_HEAD(&bridge_channel->deferred_queue, dup, frame_list);
711  ast_bridge_channel_unlock(bridge_channel);
712  }
713  }
714 
715  /* Remember any owed events to the bridge. */
716  switch (frame->frametype) {
718  bridge_channel->owed.dtmf_tv = ast_tvnow();
719  bridge_channel->owed.dtmf_digit = frame->subclass.integer;
720  break;
721  case AST_FRAME_DTMF_END:
722  bridge_channel->owed.dtmf_digit = '\0';
723  break;
724  case AST_FRAME_CONTROL:
725  /*
726  * We explicitly will not remember HOLD/UNHOLD frames because
727  * things like attended transfers will handle them.
728  */
729  switch (frame->subclass.integer) {
731  t38_parameters = frame->data.ptr;
732  switch (t38_parameters->request_response) {
734  case AST_T38_NEGOTIATED:
735  bridge_channel->owed.t38_terminate = 1;
736  break;
738  case AST_T38_TERMINATED:
739  case AST_T38_REFUSED:
740  bridge_channel->owed.t38_terminate = 0;
741  break;
742  default:
743  break;
744  }
745  break;
746  default:
747  break;
748  }
749  break;
750  default:
751  break;
752  }
753  ast_bridge_unlock(bridge_channel->bridge);
754 
755  /*
756  * Claim successful write to bridge. If deferred frame
757  * support is added, claim successfully deferred.
758  */
759  return 0;
760 }
761 
762 /*!
763  * \internal
764  * \brief Cancel owed events by the channel to the bridge.
765  * \since 13.8.0
766  *
767  * \param bridge_channel Channel that owes events to the bridge.
768  *
769  * \note On entry, the bridge_channel->bridge is already locked.
770  */
771 static void bridge_channel_cancel_owed_events(struct ast_bridge_channel *bridge_channel)
772 {
773  bridge_channel->owed.dtmf_digit = '\0';
774  bridge_channel->owed.t38_terminate = 0;
775 }
776 
777 void bridge_channel_settle_owed_events(struct ast_bridge *orig_bridge, struct ast_bridge_channel *bridge_channel)
778 {
779  if (bridge_channel->owed.dtmf_digit) {
780  struct ast_frame frame = {
782  .subclass.integer = bridge_channel->owed.dtmf_digit,
783  .src = "Bridge channel owed DTMF",
784  };
785 
786  frame.len = ast_tvdiff_ms(ast_tvnow(), bridge_channel->owed.dtmf_tv);
787  if (frame.len < option_dtmfminduration) {
788  frame.len = option_dtmfminduration;
789  }
790  ast_log(LOG_DTMF, "DTMF end '%c' simulated to bridge %s because %s left. Duration %ld ms.\n",
791  bridge_channel->owed.dtmf_digit, orig_bridge->uniqueid,
792  ast_channel_name(bridge_channel->chan), frame.len);
793  bridge_channel->owed.dtmf_digit = '\0';
794  orig_bridge->technology->write(orig_bridge, NULL, &frame);
795  }
796  if (bridge_channel->owed.t38_terminate) {
797  struct ast_control_t38_parameters t38_parameters = {
799  };
800  struct ast_frame frame = {
802  .subclass.integer = AST_CONTROL_T38_PARAMETERS,
803  .data.ptr = &t38_parameters,
804  .datalen = sizeof(t38_parameters),
805  .src = "Bridge channel owed T.38 terminate",
806  };
807 
808  ast_debug(1, "T.38 terminate simulated to bridge %s because %s left.\n",
809  orig_bridge->uniqueid, ast_channel_name(bridge_channel->chan));
810  bridge_channel->owed.t38_terminate = 0;
811  orig_bridge->technology->write(orig_bridge, NULL, &frame);
812  }
813 }
814 
815 void bridge_channel_queue_deferred_frames(struct ast_bridge_channel *bridge_channel)
816 {
817  struct ast_frame *frame;
818 
819  ast_bridge_channel_lock(bridge_channel);
820  ast_channel_lock(bridge_channel->chan);
821  while ((frame = AST_LIST_REMOVE_HEAD(&bridge_channel->deferred_queue, frame_list))) {
822  ast_queue_frame_head(bridge_channel->chan, frame);
823  ast_frfree(frame);
824  }
825  ast_channel_unlock(bridge_channel->chan);
826  ast_bridge_channel_unlock(bridge_channel);
827 }
828 
829 void bridge_channel_internal_suspend_nolock(struct ast_bridge_channel *bridge_channel)
830 {
831  bridge_channel->suspended = 1;
832  if (bridge_channel->in_bridge) {
833  --bridge_channel->bridge->num_active;
834  }
835 
836  /* Get technology bridge threads off of the channel. */
837  if (bridge_channel->bridge->technology->suspend) {
838  bridge_channel->bridge->technology->suspend(bridge_channel->bridge, bridge_channel);
839  }
840 }
841 
842 /*!
843  * \internal
844  * \brief Suspend a channel from a bridge.
845  *
846  * \param bridge_channel Channel to suspend.
847  */
848 static void bridge_channel_suspend(struct ast_bridge_channel *bridge_channel)
849 {
850  ast_bridge_channel_lock_bridge(bridge_channel);
851  bridge_channel_internal_suspend_nolock(bridge_channel);
852  ast_bridge_unlock(bridge_channel->bridge);
853 }
854 
855 void bridge_channel_internal_unsuspend_nolock(struct ast_bridge_channel *bridge_channel)
856 {
857  bridge_channel->suspended = 0;
858  if (bridge_channel->in_bridge) {
859  ++bridge_channel->bridge->num_active;
860  }
861 
862  /* Wake technology bridge threads to take care of channel again. */
863  if (bridge_channel->bridge->technology->unsuspend) {
864  bridge_channel->bridge->technology->unsuspend(bridge_channel->bridge, bridge_channel);
865  }
866 
867  /* Wake suspended channel. */
868  ast_bridge_channel_lock(bridge_channel);
869  ast_cond_signal(&bridge_channel->cond);
870  ast_bridge_channel_unlock(bridge_channel);
871 }
872 
873 /*!
874  * \internal
875  * \brief Unsuspend a channel from a bridge.
876  *
877  * \param bridge_channel Channel to unsuspend.
878  */
879 static void bridge_channel_unsuspend(struct ast_bridge_channel *bridge_channel)
880 {
881  ast_bridge_channel_lock_bridge(bridge_channel);
882  bridge_channel_internal_unsuspend_nolock(bridge_channel);
883  ast_bridge_unlock(bridge_channel->bridge);
884 }
885 
886 /*!
887  * \internal
888  * \brief Queue an action frame onto the bridge channel with data.
889  * \since 12.0.0
890  *
891  * \param bridge_channel Which channel to queue the frame onto.
892  * \param action Type of bridge action frame.
893  * \param data Frame payload data to pass.
894  * \param datalen Frame payload data length to pass.
895  *
896  * \retval 0 on success.
897  * \retval -1 on error.
898  */
899 static int bridge_channel_queue_action_data(struct ast_bridge_channel *bridge_channel,
900  enum bridge_channel_action_type action, const void *data, size_t datalen)
901 {
902  struct ast_frame frame = {
904  .subclass.integer = action,
905  .datalen = datalen,
906  .data.ptr = (void *) data,
907  };
908 
909  return ast_bridge_channel_queue_frame(bridge_channel, &frame);
910 }
911 
912 /*!
913  * \internal
914  * \brief Queue an action frame onto the bridge channel with data synchronously.
915  * \since 12.2.0
916  *
917  * The function will not return until the queued frame is freed.
918  *
919  * \param bridge_channel Which channel to queue the frame onto.
920  * \param action Type of bridge action frame.
921  * \param data Frame payload data to pass.
922  * \param datalen Frame payload data length to pass.
923  *
924  * \retval 0 on success.
925  * \retval -1 on error.
926  */
927 static int bridge_channel_queue_action_data_sync(struct ast_bridge_channel *bridge_channel,
928  enum bridge_channel_action_type action, const void *data, size_t datalen)
929 {
930  struct sync_payload *sync_payload;
931  int sync_payload_len = sizeof(*sync_payload) + datalen;
932  struct bridge_sync sync_struct;
933  struct ast_frame frame = {
935  .subclass.integer = action,
936  };
937 
938  /* Make sure we don't end up trying to wait on ourself to deliver the frame */
939  ast_assert(!pthread_equal(pthread_self(), bridge_channel->thread));
940 
941  sync_payload = ast_alloca(sync_payload_len);
942  sync_payload->id = ast_atomic_fetchadd_int(&sync_ids, +1);
943  memcpy(sync_payload->data, data, datalen);
944 
945  frame.datalen = sync_payload_len;
946  frame.data.ptr = sync_payload;
947 
948  bridge_sync_init(&sync_struct, sync_payload->id);
949  if (ast_bridge_channel_queue_frame(bridge_channel, &frame)) {
950  bridge_sync_cleanup(&sync_struct);
951  return -1;
952  }
953 
954  bridge_sync_wait(&sync_struct);
955  bridge_sync_cleanup(&sync_struct);
956  return 0;
957 }
958 /*!
959  * \internal
960  * \brief Write an action frame onto the bridge channel with data.
961  * \since 12.0.0
962  *
963  * \param bridge_channel Which channel to queue the frame onto.
964  * \param action Type of bridge action frame.
965  * \param data Frame payload data to pass.
966  * \param datalen Frame payload data length to pass.
967  *
968  * \retval 0 on success.
969  * \retval -1 on error.
970  */
971 static int bridge_channel_write_action_data(struct ast_bridge_channel *bridge_channel,
972  enum bridge_channel_action_type action, const void *data, size_t datalen)
973 {
974  struct ast_frame frame = {
976  .subclass.integer = action,
977  .datalen = datalen,
978  .data.ptr = (void *) data,
979  };
980 
981  return bridge_channel_write_frame(bridge_channel, &frame);
982 }
983 
984 static void bridge_frame_free(struct ast_frame *frame)
985 {
986  if (frame->frametype == AST_FRAME_BRIDGE_ACTION_SYNC) {
987  struct sync_payload *sync_payload = frame->data.ptr;
988  struct bridge_sync *sync;
989 
991  AST_RWLIST_TRAVERSE(&sync_structs, sync, list) {
992  if (sync->id == sync_payload->id) {
993  break;
994  }
995  }
996  if (sync) {
997  bridge_sync_signal(sync);
998  }
1000  }
1001 
1002  ast_frfree(frame);
1003 }
1004 
1005 int ast_bridge_channel_queue_frame(struct ast_bridge_channel *bridge_channel, struct ast_frame *fr)
1006 {
1007  struct ast_frame *dup;
1008 
1009  if (bridge_channel->suspended
1010  /* Also defer DTMF frames. */
1012  && fr->frametype != AST_FRAME_DTMF_END
1013  && !ast_is_deferrable_frame(fr)) {
1014  /* Drop non-deferable frames when suspended. */
1015  return 0;
1016  }
1017  if (fr->frametype == AST_FRAME_NULL) {
1018  /* "Accept" the frame and discard it. */
1019  return 0;
1020  }
1021 
1022  if ((fr->frametype == AST_FRAME_VOICE || fr->frametype == AST_FRAME_VIDEO ||
1024  fr->frametype == AST_FRAME_RTCP) && fr->stream_num > -1) {
1025  int num = -1;
1026 
1027  ast_bridge_channel_lock(bridge_channel);
1028  if (fr->stream_num < (int)AST_VECTOR_SIZE(&bridge_channel->stream_map.to_channel)) {
1029  num = AST_VECTOR_GET(&bridge_channel->stream_map.to_channel, fr->stream_num);
1030  }
1031  ast_bridge_channel_unlock(bridge_channel);
1032 
1033  if (num == -1) {
1034  /* We don't have a mapped stream so just discard this frame. */
1035  return 0;
1036  }
1037  }
1038 
1039  dup = ast_frdup(fr);
1040  if (!dup) {
1041  return -1;
1042  }
1043 
1044  ast_bridge_channel_lock(bridge_channel);
1045  if (bridge_channel->state != BRIDGE_CHANNEL_STATE_WAIT) {
1046  /* Drop frames on channels leaving the bridge. */
1047  ast_bridge_channel_unlock(bridge_channel);
1048  bridge_frame_free(dup);
1049  return 0;
1050  }
1051 
1052  if ((fr->frametype == AST_FRAME_TEXT || fr->frametype == AST_FRAME_TEXT_DATA) &&
1053  !bridge_channel->features->text_messaging) {
1054  /* This channel is not accepting text messages. */
1055  ast_bridge_channel_unlock(bridge_channel);
1056  bridge_frame_free(dup);
1057  return 0;
1058  }
1059 
1060  if (DEBUG_ATLEAST(1)) {
1061  if (fr->frametype == AST_FRAME_TEXT) {
1062  ast_log(LOG_DEBUG, "Queuing TEXT frame to '%s': %*.s\n", ast_channel_name(bridge_channel->chan),
1063  fr->datalen, (char *)fr->data.ptr);
1064  } else if (fr->frametype == AST_FRAME_TEXT_DATA) {
1065  struct ast_msg_data *msg = fr->data.ptr;
1066  ast_log(LOG_DEBUG, "Queueing TEXT_DATA frame from '%s' to '%s:%s': %s\n",
1067  ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_FROM),
1068  ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_TO),
1069  ast_channel_name(bridge_channel->chan),
1070  ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_BODY));
1071  }
1072  }
1073 
1074  AST_LIST_INSERT_TAIL(&bridge_channel->wr_queue, dup, frame_list);
1075  if (ast_alertpipe_write(bridge_channel->alert_pipe)) {
1076  ast_log(LOG_ERROR, "We couldn't write alert pipe for %p(%s)... something is VERY wrong\n",
1077  bridge_channel, ast_channel_name(bridge_channel->chan));
1078  }
1079  ast_bridge_channel_unlock(bridge_channel);
1080  return 0;
1081 }
1082 
1083 int ast_bridge_queue_everyone_else(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
1084 {
1085  struct ast_bridge_channel *cur;
1086  int not_written = -1;
1087 
1088  if (frame->frametype == AST_FRAME_NULL) {
1089  /* "Accept" the frame and discard it. */
1090  return 0;
1091  }
1092 
1093  AST_LIST_TRAVERSE(&bridge->channels, cur, entry) {
1094  if (cur == bridge_channel) {
1095  continue;
1096  }
1097  if (!ast_bridge_channel_queue_frame(cur, frame)) {
1098  not_written = 0;
1099  }
1100  }
1101  return not_written;
1102 }
1103 
1104 int ast_bridge_channel_queue_control_data(struct ast_bridge_channel *bridge_channel, enum ast_control_frame_type control, const void *data, size_t datalen)
1105 {
1106  struct ast_frame frame = {
1108  .subclass.integer = control,
1109  .datalen = datalen,
1110  .data.ptr = (void *) data,
1111  };
1112 
1113  return ast_bridge_channel_queue_frame(bridge_channel, &frame);
1114 }
1115 
1116 int ast_bridge_channel_write_control_data(struct ast_bridge_channel *bridge_channel, enum ast_control_frame_type control, const void *data, size_t datalen)
1117 {
1118  struct ast_frame frame = {
1120  .subclass.integer = control,
1121  .datalen = datalen,
1122  .data.ptr = (void *) data,
1123  };
1124 
1125  return bridge_channel_write_frame(bridge_channel, &frame);
1126 }
1127 
1128 int ast_bridge_channel_write_hold(struct ast_bridge_channel *bridge_channel, const char *moh_class)
1129 {
1130  struct ast_json *blob;
1131  int res;
1132  size_t datalen;
1133 
1134  if (!ast_strlen_zero(moh_class)) {
1135  datalen = strlen(moh_class) + 1;
1136 
1137  blob = ast_json_pack("{s: s}",
1138  "musicclass", moh_class);
1139  } else {
1140  moh_class = NULL;
1141  datalen = 0;
1142  blob = NULL;
1143  }
1144 
1146 
1148  moh_class, datalen);
1149 
1150  ast_json_unref(blob);
1151  return res;
1152 }
1153 
1155 {
1156  struct ast_channel *chan = ast_bridge_channel_get_chan(bridge_channel);
1157 
1158  if (!chan) {
1159  return -1;
1160  }
1161 
1163  ao2_ref(chan, -1);
1164 
1165  return ast_bridge_channel_write_control_data(bridge_channel, AST_CONTROL_UNHOLD, NULL, 0);
1166 }
1167 
1168 /*!
1169  * \internal
1170  * \brief Helper function to kick off a PBX app on a bridge_channel
1171  */
1172 static int run_app_helper(struct ast_channel *chan, const char *app_name, const char *app_args)
1173 {
1174  int res = 0;
1175 
1176  if (!strcasecmp("Gosub", app_name)) {
1177  ast_app_exec_sub(NULL, chan, app_args, 0);
1178  } else {
1179  res = ast_pbx_exec_application(chan, app_name, app_args);
1180  }
1181  return res;
1182 }
1183 
1184 void ast_bridge_channel_run_app(struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
1185 {
1186  if (moh_class) {
1187  ast_bridge_channel_write_hold(bridge_channel, moh_class);
1188  }
1189  if (run_app_helper(bridge_channel->chan, app_name, S_OR(app_args, ""))) {
1190  /* Break the bridge if the app returns non-zero. */
1191  ast_bridge_channel_kick(bridge_channel, AST_CAUSE_NORMAL_CLEARING);
1192  }
1193  if (moh_class) {
1194  ast_bridge_channel_write_unhold(bridge_channel);
1195  }
1196 }
1197 
1199  /*! Offset into app_name[] where the MOH class name starts. (zero if no MOH) */
1201  /*! Offset into app_name[] where the application argument string starts. (zero if no arguments) */
1203  /*! Application name to run. */
1204  char app_name[0];
1205 };
1206 
1207 /*!
1208  * \internal
1209  * \brief Handle the run application bridge action.
1210  * \since 12.0.0
1211  *
1212  * \param bridge_channel Which channel to run the application on.
1213  * \param data Action frame data to run the application.
1214  */
1215 static void bridge_channel_run_app(struct ast_bridge_channel *bridge_channel, struct bridge_run_app *data)
1216 {
1217  ast_bridge_channel_run_app(bridge_channel, data->app_name,
1218  data->app_args_offset ? &data->app_name[data->app_args_offset] : NULL,
1219  data->moh_offset ? &data->app_name[data->moh_offset] : NULL);
1220 }
1221 
1222 /*!
1223  * \internal
1224  * \brief Marshal an application to be executed on a bridge_channel
1225  */
1226 static int payload_helper_app(ast_bridge_channel_post_action_data post_it,
1227  struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
1228 {
1229  struct bridge_run_app *app_data;
1230  size_t len_name = strlen(app_name) + 1;
1231  size_t len_args = ast_strlen_zero(app_args) ? 0 : strlen(app_args) + 1;
1232  size_t len_moh = !moh_class ? 0 : strlen(moh_class) + 1;
1233  size_t len_data = sizeof(*app_data) + len_name + len_args + len_moh;
1234 
1235  /* Fill in application run frame data. */
1236  app_data = alloca(len_data);
1237  app_data->app_args_offset = len_args ? len_name : 0;
1238  app_data->moh_offset = len_moh ? len_name + len_args : 0;
1239  strcpy(app_data->app_name, app_name);/* Safe */
1240  if (len_args) {
1241  strcpy(&app_data->app_name[app_data->app_args_offset], app_args);/* Safe */
1242  }
1243  if (moh_class) {
1244  strcpy(&app_data->app_name[app_data->moh_offset], moh_class);/* Safe */
1245  }
1246 
1247  return post_it(bridge_channel, BRIDGE_CHANNEL_ACTION_RUN_APP, app_data, len_data);
1248 }
1249 
1250 int ast_bridge_channel_write_app(struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
1251 {
1252  return payload_helper_app(bridge_channel_write_action_data,
1253  bridge_channel, app_name, app_args, moh_class);
1254 }
1255 
1256 int ast_bridge_channel_queue_app(struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
1257 {
1258  return payload_helper_app(bridge_channel_queue_action_data,
1259  bridge_channel, app_name, app_args, moh_class);
1260 }
1261 
1262 void ast_bridge_channel_playfile(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
1263 {
1264  if (moh_class) {
1265  ast_bridge_channel_write_hold(bridge_channel, moh_class);
1266  }
1267  if (custom_play) {
1268  custom_play(bridge_channel, playfile);
1269  } else {
1270  ast_stream_and_wait(bridge_channel->chan, playfile, AST_DIGIT_NONE);
1271  }
1272  if (moh_class) {
1273  ast_bridge_channel_write_unhold(bridge_channel);
1274  }
1275 
1276  /*
1277  * It may be necessary to resume music on hold after we finish
1278  * playing the announcment.
1279  */
1280  if (ast_test_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_MOH)) {
1281  const char *latest_musicclass;
1282 
1283  ast_channel_lock(bridge_channel->chan);
1284  latest_musicclass = ast_strdupa(ast_channel_latest_musicclass(bridge_channel->chan));
1285  ast_channel_unlock(bridge_channel->chan);
1286  ast_moh_start(bridge_channel->chan, latest_musicclass, NULL);
1287  }
1288 }
1289 
1291  /*! Call this function to play the playfile. (NULL if normal sound file to play) */
1293  /*! Offset into playfile[] where the MOH class name starts. (zero if no MOH)*/
1295  /*! Filename to play. */
1296  char playfile[0];
1297 };
1298 
1299 /*!
1300  * \internal
1301  * \brief Handle the playfile bridge action.
1302  * \since 12.0.0
1303  *
1304  * \param bridge_channel Which channel to play a file on.
1305  * \param payload Action frame payload to play a file.
1306  */
1307 static void bridge_channel_playfile(struct ast_bridge_channel *bridge_channel, struct bridge_playfile *payload)
1308 {
1309  ast_bridge_channel_playfile(bridge_channel, payload->custom_play, payload->playfile,
1310  payload->moh_offset ? &payload->playfile[payload->moh_offset] : NULL);
1311 }
1312 
1313 /*!
1314  * \internal
1315  * \brief Marshal a file to be played on a bridge_channel
1316  */
1317 static int payload_helper_playfile(ast_bridge_channel_post_action_data post_it,
1318  struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
1319 {
1320  struct bridge_playfile *payload;
1321  size_t len_name = strlen(playfile) + 1;
1322  size_t len_moh = !moh_class ? 0 : strlen(moh_class) + 1;
1323  size_t len_payload = sizeof(*payload) + len_name + len_moh;
1324 
1325  /* Fill in play file frame data. */
1326  payload = ast_alloca(len_payload);
1327  payload->custom_play = custom_play;
1328  payload->moh_offset = len_moh ? len_name : 0;
1329  strcpy(payload->playfile, playfile);/* Safe */
1330  if (moh_class) {
1331  strcpy(&payload->playfile[payload->moh_offset], moh_class);/* Safe */
1332  }
1333 
1334  return post_it(bridge_channel, BRIDGE_CHANNEL_ACTION_PLAY_FILE, payload, len_payload);
1335 }
1336 
1337 int ast_bridge_channel_write_playfile(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
1338 {
1339  return payload_helper_playfile(bridge_channel_write_action_data,
1340  bridge_channel, custom_play, playfile, moh_class);
1341 }
1342 
1343 int ast_bridge_channel_queue_playfile(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
1344 {
1345  return payload_helper_playfile(bridge_channel_queue_action_data,
1346  bridge_channel, custom_play, playfile, moh_class);
1347 }
1348 
1350  ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
1351 {
1352  return payload_helper_playfile(bridge_channel_queue_action_data_sync,
1353  bridge_channel, custom_play, playfile, moh_class);
1354 }
1355 
1357  /*! Call this function on the bridge channel thread. */
1359  /*! Size of the payload if it exists. A number otherwise. */
1361  /*! Option flags determining how callback is called. */
1362  unsigned int flags;
1363  /*! Nonzero if the payload exists. */
1365  /*! Payload to give to callback. */
1366  char payload[0];
1367 };
1368 
1369 /*!
1370  * \internal
1371  * \brief Handle the do custom callback bridge action.
1372  * \since 12.0.0
1373  *
1374  * \param bridge_channel Which channel to call the callback on.
1375  * \param data Action frame data to call the callback.
1376  */
1377 static void bridge_channel_do_callback(struct ast_bridge_channel *bridge_channel, struct bridge_custom_callback *data)
1378 {
1379  if (ast_test_flag(data, AST_BRIDGE_CHANNEL_CB_OPTION_MEDIA)) {
1380  bridge_channel_suspend(bridge_channel);
1381  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
1382  }
1383  data->callback(bridge_channel, data->payload_exists ? data->payload : NULL, data->payload_size);
1384  if (ast_test_flag(data, AST_BRIDGE_CHANNEL_CB_OPTION_MEDIA)) {
1385  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
1386  bridge_channel_unsuspend(bridge_channel);
1387  }
1388 }
1389 
1390 /*!
1391  * \internal
1392  * \brief Marshal a custom callback function to be called on a bridge_channel
1393  */
1394 static int payload_helper_cb(ast_bridge_channel_post_action_data post_it,
1395  struct ast_bridge_channel *bridge_channel,
1397  ast_bridge_custom_callback_fn callback, const void *payload, size_t payload_size)
1398 {
1399  struct bridge_custom_callback *cb_data;
1400  size_t len_data = sizeof(*cb_data) + (payload ? payload_size : 0);
1401 
1402  /* Sanity check. */
1403  if (!callback) {
1404  ast_assert(0);
1405  return -1;
1406  }
1407 
1408  /* Fill in custom callback frame data. */
1409  cb_data = alloca(len_data);
1410  cb_data->callback = callback;
1411  cb_data->payload_size = payload_size;
1412  cb_data->flags = flags;
1413  cb_data->payload_exists = payload && payload_size;
1414  if (cb_data->payload_exists) {
1415  memcpy(cb_data->payload, payload, payload_size);/* Safe */
1416  }
1417 
1418  return post_it(bridge_channel, BRIDGE_CHANNEL_ACTION_CALLBACK, cb_data, len_data);
1419 }
1420 
1423  ast_bridge_custom_callback_fn callback, const void *payload, size_t payload_size)
1424 {
1425  return payload_helper_cb(bridge_channel_write_action_data,
1426  bridge_channel, flags, callback, payload, payload_size);
1427 }
1428 
1431  ast_bridge_custom_callback_fn callback, const void *payload, size_t payload_size)
1432 {
1433  return payload_helper_cb(bridge_channel_queue_action_data,
1434  bridge_channel, flags, callback, payload, payload_size);
1435 }
1436 
1437 struct bridge_park {
1438  int parker_uuid_offset;
1439  int app_data_offset;
1440  /* buffer used for holding those strings */
1441  char parkee_uuid[0];
1442 };
1443 
1444 /*!
1445  * \internal
1446  * \brief Park a bridge_cahnnel
1447  */
1448 static void bridge_channel_park(struct ast_bridge_channel *bridge_channel, struct bridge_park *payload)
1449 {
1451  ast_log(AST_LOG_WARNING, "Unable to park %s: No parking provider loaded!\n",
1452  ast_channel_name(bridge_channel->chan));
1453  return;
1454  }
1455 
1456  if (ast_parking_park_bridge_channel(bridge_channel, payload->parkee_uuid,
1457  &payload->parkee_uuid[payload->parker_uuid_offset],
1458  payload->app_data_offset ? &payload->parkee_uuid[payload->app_data_offset] : NULL)) {
1459  ast_log(AST_LOG_WARNING, "Error occurred while parking %s\n",
1460  ast_channel_name(bridge_channel->chan));
1461  }
1462 }
1463 
1464 /*!
1465  * \internal
1466  * \brief Marshal a park action onto a bridge_channel
1467  */
1468 static int payload_helper_park(ast_bridge_channel_post_action_data post_it,
1469  struct ast_bridge_channel *bridge_channel,
1470  const char *parkee_uuid,
1471  const char *parker_uuid,
1472  const char *app_data)
1473 {
1474  struct bridge_park *payload;
1475  size_t len_parkee_uuid = strlen(parkee_uuid) + 1;
1476  size_t len_parker_uuid = strlen(parker_uuid) + 1;
1477  size_t len_app_data = !app_data ? 0 : strlen(app_data) + 1;
1478  size_t len_payload = sizeof(*payload) + len_parker_uuid + len_parkee_uuid + len_app_data;
1479 
1480  payload = alloca(len_payload);
1481  payload->app_data_offset = len_app_data ? len_parkee_uuid + len_parker_uuid : 0;
1482  payload->parker_uuid_offset = len_parkee_uuid;
1483  strcpy(payload->parkee_uuid, parkee_uuid);
1484  strcpy(&payload->parkee_uuid[payload->parker_uuid_offset], parker_uuid);
1485  if (app_data) {
1486  strcpy(&payload->parkee_uuid[payload->app_data_offset], app_data);
1487  }
1488 
1489  return post_it(bridge_channel, BRIDGE_CHANNEL_ACTION_PARK, payload, len_payload);
1490 }
1491 
1492 int ast_bridge_channel_write_park(struct ast_bridge_channel *bridge_channel, const char *parkee_uuid, const char *parker_uuid, const char *app_data)
1493 {
1494  return payload_helper_park(bridge_channel_write_action_data,
1495  bridge_channel, parkee_uuid, parker_uuid, app_data);
1496 }
1497 
1498 /*!
1499  * \internal
1500  * \brief Handle bridge channel interval expiration.
1501  * \since 12.0.0
1502  *
1503  * \param bridge_channel Channel to run expired intervals on.
1504  */
1505 static void bridge_channel_handle_interval(struct ast_bridge_channel *bridge_channel)
1506 {
1507  struct ast_heap *interval_hooks;
1508  struct ast_bridge_hook_timer *hook;
1509  struct timeval start;
1510  int chan_suspended = 0;
1511 
1512  interval_hooks = bridge_channel->features->interval_hooks;
1513  ast_heap_wrlock(interval_hooks);
1514  start = ast_tvnow();
1515  while ((hook = ast_heap_peek(interval_hooks, 1))) {
1516  int interval;
1517  unsigned int execution_time;
1518 
1519  if (ast_tvdiff_ms(hook->timer.trip_time, start) > 0) {
1520  ast_debug(1, "Hook %p on %p(%s) wants to happen in the future, stopping our traversal\n",
1521  hook, bridge_channel, ast_channel_name(bridge_channel->chan));
1522  break;
1523  }
1524  ao2_ref(hook, +1);
1525  ast_heap_unlock(interval_hooks);
1526 
1527  if (!chan_suspended
1528  && ast_test_flag(&hook->timer, AST_BRIDGE_HOOK_TIMER_OPTION_MEDIA)) {
1529  chan_suspended = 1;
1530  bridge_channel_suspend(bridge_channel);
1531  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
1532  }
1533 
1534  ast_debug(1, "Executing hook %p on %p(%s)\n",
1535  hook, bridge_channel, ast_channel_name(bridge_channel->chan));
1536  interval = hook->generic.callback(bridge_channel, hook->generic.hook_pvt);
1537 
1538  ast_heap_wrlock(interval_hooks);
1539  if (ast_heap_peek(interval_hooks, hook->timer.heap_index) != hook
1540  || !ast_heap_remove(interval_hooks, hook)) {
1541  /* Interval hook is already removed from the bridge_channel. */
1542  ao2_ref(hook, -1);
1543  continue;
1544  }
1545  ao2_ref(hook, -1);
1546 
1547  if (interval < 0) {
1548  ast_debug(1, "Removed interval hook %p from %p(%s)\n",
1549  hook, bridge_channel, ast_channel_name(bridge_channel->chan));
1550  ao2_ref(hook, -1);
1551  continue;
1552  }
1553  if (interval) {
1554  /* Set new interval for the hook. */
1555  hook->timer.interval = interval;
1556  }
1557 
1558  ast_debug(1, "Updating interval hook %p with interval %u on %p(%s)\n",
1559  hook, hook->timer.interval, bridge_channel,
1560  ast_channel_name(bridge_channel->chan));
1561 
1562  /* resetting start */
1563  start = ast_tvnow();
1564 
1565  /*
1566  * Resetup the interval hook for the next interval. We may need
1567  * to skip over any missed intervals because the hook was
1568  * delayed or took too long.
1569  */
1570  execution_time = ast_tvdiff_ms(start, hook->timer.trip_time);
1571  while (hook->timer.interval < execution_time) {
1572  execution_time -= hook->timer.interval;
1573  }
1574  hook->timer.trip_time = ast_tvadd(start, ast_samp2tv(hook->timer.interval - execution_time, 1000));
1575  hook->timer.seqno = ast_atomic_fetchadd_int((int *) &bridge_channel->features->interval_sequence, +1);
1576 
1577  if (ast_heap_push(interval_hooks, hook)) {
1578  /* Could not push the hook back onto the heap. */
1579  ao2_ref(hook, -1);
1580  }
1581  }
1582  ast_heap_unlock(interval_hooks);
1583 
1584  if (chan_suspended) {
1585  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
1586  bridge_channel_unsuspend(bridge_channel);
1587  }
1588 }
1589 
1590 /*!
1591  * \internal
1592  * \brief Write a DTMF stream out to a channel
1593  */
1594 static int bridge_channel_write_dtmf_stream(struct ast_bridge_channel *bridge_channel, const char *dtmf)
1595 {
1596  return bridge_channel_write_action_data(bridge_channel,
1597  BRIDGE_CHANNEL_ACTION_DTMF_STREAM, dtmf, strlen(dtmf) + 1);
1598 }
1599 
1600 /*!
1601  * \internal
1602  * \brief Indicate to the testsuite a feature was successfully detected.
1603  *
1604  * Currently, this function only will relay built-in features to the testsuite,
1605  * but it could be modified to detect applicationmap items should the need arise.
1606  *
1607  * \param chan The channel that activated the feature
1608  * \param dtmf The DTMF sequence entered to activate the feature
1609  */
1610 static void testsuite_notify_feature_success(struct ast_channel *chan, const char *dtmf)
1611 {
1612 #ifdef TEST_FRAMEWORK
1613  char *feature = "unknown";
1614  struct ast_featuremap_config *featuremap;
1615  struct ast_features_xfer_config *xfer;
1616 
1617  ast_channel_lock(chan);
1618  featuremap = ast_get_chan_featuremap_config(chan);
1619  xfer = ast_get_chan_features_xfer_config(chan);
1620  ast_channel_unlock(chan);
1621 
1622  if (featuremap) {
1623  if (!strcmp(dtmf, featuremap->blindxfer)) {
1624  feature = "blindxfer";
1625  } else if (!strcmp(dtmf, featuremap->atxfer)) {
1626  feature = "atxfer";
1627  } else if (!strcmp(dtmf, featuremap->disconnect)) {
1628  feature = "disconnect";
1629  } else if (!strcmp(dtmf, featuremap->automixmon)) {
1630  feature = "automixmon";
1631  } else if (!strcmp(dtmf, featuremap->parkcall)) {
1632  feature = "parkcall";
1633  }
1634  }
1635  if (xfer) {
1636  if (!strcmp(dtmf, xfer->atxferthreeway)) {
1637  feature = "atxferthreeway";
1638  }
1639  }
1640 
1641  ao2_cleanup(featuremap);
1642  ao2_cleanup(xfer);
1643 
1644  ast_test_suite_event_notify("FEATURE_DETECTION",
1645  "Result: success\r\n"
1646  "Feature: %s", feature);
1647 #endif /* TEST_FRAMEWORK */
1648 }
1649 
1650 static int bridge_channel_feature_digit_add(
1651  struct ast_bridge_channel *bridge_channel, int digit, size_t dtmf_len)
1652 {
1653  if (dtmf_len < ARRAY_LEN(bridge_channel->dtmf_hook_state.collected) - 1) {
1654  /* Add the new digit to the DTMF string so we can do our matching */
1655  bridge_channel->dtmf_hook_state.collected[dtmf_len++] = digit;
1656  bridge_channel->dtmf_hook_state.collected[dtmf_len] = '\0';
1657 
1658  ast_debug(1, "DTMF feature string on %p(%s) is now '%s'\n",
1659  bridge_channel, ast_channel_name(bridge_channel->chan),
1660  bridge_channel->dtmf_hook_state.collected);
1661  }
1662 
1663  return dtmf_len;
1664 }
1665 
1666 static unsigned int bridge_channel_feature_digit_timeout(struct ast_bridge_channel *bridge_channel)
1667 {
1668  unsigned int digit_timeout;
1669  struct ast_features_general_config *gen_cfg;
1670 
1671  /* Determine interdigit timeout */
1672  ast_channel_lock(bridge_channel->chan);
1673  gen_cfg = ast_get_chan_features_general_config(bridge_channel->chan);
1674  ast_channel_unlock(bridge_channel->chan);
1675 
1676  if (!gen_cfg) {
1677  ast_log(LOG_ERROR, "Unable to retrieve features configuration.\n");
1678  return 3000; /* Pick a reasonable failsafe timeout in ms */
1679  }
1680 
1681  digit_timeout = gen_cfg->featuredigittimeout;
1682  ao2_ref(gen_cfg, -1);
1683 
1684  return digit_timeout;
1685 }
1686 
1687 void ast_bridge_channel_feature_digit_add(struct ast_bridge_channel *bridge_channel, int digit)
1688 {
1689  if (digit) {
1690  bridge_channel_feature_digit_add(
1691  bridge_channel, digit, strlen(bridge_channel->dtmf_hook_state.collected));
1692  }
1693 }
1694 
1695 void ast_bridge_channel_feature_digit(struct ast_bridge_channel *bridge_channel, int digit)
1696 {
1697  struct ast_bridge_features *features = bridge_channel->features;
1698  struct ast_bridge_hook_dtmf *hook = NULL;
1699  size_t dtmf_len;
1700 
1701  struct sanity_check_of_dtmf_size {
1702  char check[1 / (ARRAY_LEN(bridge_channel->dtmf_hook_state.collected) == ARRAY_LEN(hook->dtmf.code))];
1703  };
1704 
1705  dtmf_len = strlen(bridge_channel->dtmf_hook_state.collected);
1706  if (!dtmf_len && !digit) {
1707  /* Nothing to do */
1708  return;
1709  }
1710 
1711  if (digit) {
1712  dtmf_len = bridge_channel_feature_digit_add(bridge_channel, digit, dtmf_len);
1713  }
1714 
1715  while (digit) {
1716  /* See if a DTMF feature hook matches or can match */
1717  hook = ao2_find(features->dtmf_hooks, bridge_channel->dtmf_hook_state.collected,
1719  if (!hook) {
1720  ast_debug(1, "No DTMF feature hooks on %p(%s) match '%s'\n",
1721  bridge_channel, ast_channel_name(bridge_channel->chan),
1722  bridge_channel->dtmf_hook_state.collected);
1723  break;
1724  } else if (dtmf_len != strlen(hook->dtmf.code)) {
1725  unsigned int digit_timeout;
1726  /* Need more digits to match */
1727  ao2_ref(hook, -1);
1728  digit_timeout = bridge_channel_feature_digit_timeout(bridge_channel);
1729  bridge_channel->dtmf_hook_state.interdigit_timeout =
1730  ast_tvadd(ast_tvnow(), ast_samp2tv(digit_timeout, 1000));
1731  return;
1732  } else {
1733  int remove_me;
1734  int already_suspended;
1735 
1736  ast_debug(1, "DTMF feature hook %p matched DTMF string '%s' on %p(%s)\n",
1737  hook, bridge_channel->dtmf_hook_state.collected, bridge_channel,
1738  ast_channel_name(bridge_channel->chan));
1739 
1740  /*
1741  * Clear the collected digits before executing the hook
1742  * in case the hook starts another sequence.
1743  */
1744  bridge_channel->dtmf_hook_state.collected[0] = '\0';
1745 
1746  ast_bridge_channel_lock_bridge(bridge_channel);
1747  already_suspended = bridge_channel->suspended;
1748  if (!already_suspended) {
1749  bridge_channel_internal_suspend_nolock(bridge_channel);
1750  }
1751  ast_bridge_unlock(bridge_channel->bridge);
1752  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
1753 
1754  /* Execute the matched hook on this channel. */
1755  remove_me = hook->generic.callback(bridge_channel, hook->generic.hook_pvt);
1756  if (remove_me) {
1757  ast_debug(1, "DTMF hook %p is being removed from %p(%s)\n",
1758  hook, bridge_channel, ast_channel_name(bridge_channel->chan));
1759  ao2_unlink(features->dtmf_hooks, hook);
1760  }
1761  testsuite_notify_feature_success(bridge_channel->chan, hook->dtmf.code);
1762  ao2_ref(hook, -1);
1763 
1764  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
1765  if (!already_suspended) {
1766  bridge_channel_unsuspend(bridge_channel);
1767  }
1768 
1769  /*
1770  * If we are handing the channel off to an external hook for
1771  * ownership, we are not guaranteed what kind of state it will
1772  * come back in. If the channel hungup, we need to detect that
1773  * here if the hook did not already change the state.
1774  */
1775  if (bridge_channel->chan && ast_check_hangup_locked(bridge_channel->chan)) {
1776  ast_bridge_channel_kick(bridge_channel, 0);
1777  bridge_channel->dtmf_hook_state.collected[0] = '\0';
1778  return;
1779  }
1780 
1781  /* if there is dtmf that has been collected then loop back through,
1782  but set digit to -1 so it doesn't try to do an add since the dtmf
1783  is already in the buffer */
1784  dtmf_len = strlen(bridge_channel->dtmf_hook_state.collected);
1785  if (!dtmf_len) {
1786  return;
1787  }
1788  }
1789  }
1790 
1791  if (!digit) {
1792  ast_debug(1, "DTMF feature string collection on %p(%s) timed out\n",
1793  bridge_channel, ast_channel_name(bridge_channel->chan));
1794  }
1795 
1796  /* Timeout or DTMF digit didn't allow a match with any hooks. */
1797  if (features->dtmf_passthrough) {
1798  /* Stream the collected DTMF to the other channels. */
1799  bridge_channel_write_dtmf_stream(bridge_channel,
1800  bridge_channel->dtmf_hook_state.collected);
1801  }
1802  bridge_channel->dtmf_hook_state.collected[0] = '\0';
1803 
1804  ast_test_suite_event_notify("FEATURE_DETECTION", "Result: fail");
1805 }
1806 
1807 /*!
1808  * \internal
1809  * \brief Handle bridge channel DTMF feature timeout expiration.
1810  * \since 12.8.0
1811  *
1812  * \param bridge_channel Channel to check expired interdigit timer on.
1813  */
1814 static void bridge_channel_handle_feature_timeout(struct ast_bridge_channel *bridge_channel)
1815 {
1816  if (!bridge_channel->dtmf_hook_state.collected[0]
1817  || 0 < ast_tvdiff_ms(bridge_channel->dtmf_hook_state.interdigit_timeout,
1818  ast_tvnow())) {
1819  /* Not within a sequence or not timed out. */
1820  return;
1821  }
1822 
1823  ast_bridge_channel_feature_digit(bridge_channel, 0);
1824 }
1825 
1826 /*!
1827  * \internal
1828  * \brief Indicate that a bridge_channel is talking
1829  */
1830 static void bridge_channel_talking(struct ast_bridge_channel *bridge_channel, int talking)
1831 {
1832  struct ast_bridge_features *features = bridge_channel->features;
1833  struct ast_bridge_hook *hook;
1834  struct ao2_iterator iter;
1835 
1836  /* Run any talk detection hooks. */
1837  iter = ao2_iterator_init(features->other_hooks, 0);
1838  for (; (hook = ao2_iterator_next(&iter)); ao2_ref(hook, -1)) {
1839  int remove_me;
1841 
1842  if (hook->type != AST_BRIDGE_HOOK_TYPE_TALK) {
1843  continue;
1844  }
1846  remove_me = talk_cb(bridge_channel, hook->hook_pvt, talking);
1847  if (remove_me) {
1848  ast_debug(1, "Talk detection hook %p is being removed from %p(%s)\n",
1849  hook, bridge_channel, ast_channel_name(bridge_channel->chan));
1850  ao2_unlink(features->other_hooks, hook);
1851  }
1852  }
1853  ao2_iterator_destroy(&iter);
1854 }
1855 
1856 /*!
1857  * \internal
1858  * \brief Play back DTMF on a bridge channel
1859  */
1860 static void bridge_channel_dtmf_stream(struct ast_bridge_channel *bridge_channel, const char *dtmf)
1861 {
1862  ast_debug(1, "Playing DTMF stream '%s' out to %p(%s)\n",
1863  dtmf, bridge_channel, ast_channel_name(bridge_channel->chan));
1864  ast_dtmf_stream(bridge_channel->chan, NULL, dtmf, 0, 0);
1865 }
1866 
1867 /*! \brief Data specifying where a blind transfer is going to */
1869  char exten[AST_MAX_EXTENSION];
1870  char context[AST_MAX_CONTEXT];
1871 };
1872 
1873 /*!
1874  * \internal
1875  * \brief Execute after bridge actions on a channel when it leaves a bridge
1876  */
1877 static void after_bridge_move_channel(struct ast_channel *chan_bridged, void *data)
1878 {
1879  RAII_VAR(struct ast_channel *, chan_target, data, ao2_cleanup);
1880  struct ast_party_connected_line connected_target;
1881  unsigned char connected_line_data[1024];
1882  int payload_size;
1883 
1884  ast_party_connected_line_init(&connected_target);
1885 
1886  ast_channel_lock(chan_target);
1887  ast_party_connected_line_copy(&connected_target, ast_channel_connected(chan_target));
1888  ast_channel_unlock(chan_target);
1889  ast_party_id_reset(&connected_target.priv);
1890 
1891  if (ast_channel_move(chan_target, chan_bridged)) {
1892  ast_softhangup(chan_target, AST_SOFTHANGUP_DEV);
1893  ast_party_connected_line_free(&connected_target);
1894  return;
1895  }
1896 
1897  /* The ast_channel_move function will end up updating the connected line information
1898  * on chan_target to the value we have here, but will not inform it. To ensure that
1899  * AST_FRAME_READ_ACTION_CONNECTED_LINE_MACRO is executed we wipe it away here. If
1900  * we don't do this then the change will be considered redundant, since the connected
1901  * line information is already there (despite the channel not being told).
1902  */
1903  ast_channel_lock(chan_target);
1904  ast_party_connected_line_free(ast_channel_connected_indicated(chan_target));
1905  ast_party_connected_line_init(ast_channel_connected_indicated(chan_target));
1906  ast_channel_unlock(chan_target);
1907 
1908  if ((payload_size = ast_connected_line_build_data(connected_line_data,
1909  sizeof(connected_line_data), &connected_target, NULL)) != -1) {
1910  struct ast_control_read_action_payload *frame_payload;
1911  int frame_size;
1912 
1913  frame_size = payload_size + sizeof(*frame_payload);
1914  frame_payload = ast_alloca(frame_size);
1915  frame_payload->action = AST_FRAME_READ_ACTION_CONNECTED_LINE_MACRO;
1916  frame_payload->payload_size = payload_size;
1917  memcpy(frame_payload->payload, connected_line_data, payload_size);
1918  ast_queue_control_data(chan_target, AST_CONTROL_READ_ACTION, frame_payload, frame_size);
1919  }
1920 
1921  /* A connected line update is queued so that if chan_target is remotely involved with
1922  * anything (such as dialing a channel) the other channel(s) will be informed of the
1923  * new channel they are involved with.
1924  */
1925  ast_channel_lock(chan_target);
1926  ast_connected_line_copy_from_caller(&connected_target, ast_channel_caller(chan_target));
1927  ast_channel_queue_connected_line_update(chan_target, &connected_target, NULL);
1928  ast_channel_unlock(chan_target);
1929 
1930  ast_party_connected_line_free(&connected_target);
1931 }
1932 
1933 /*!
1934  * \internal
1935  * \brief Execute logic to cleanup when after bridge fails
1936  */
1937 static void after_bridge_move_channel_fail(enum ast_bridge_after_cb_reason reason, void *data)
1938 {
1939  RAII_VAR(struct ast_channel *, chan_target, data, ao2_cleanup);
1940 
1941  ast_log(LOG_WARNING, "Unable to complete transfer: %s\n",
1943  ast_softhangup(chan_target, AST_SOFTHANGUP_DEV);
1944 }
1945 
1946 /*!
1947  * \internal
1948  * \brief Perform a blind transfer on a channel in a bridge
1949  */
1950 static void bridge_channel_blind_transfer(struct ast_bridge_channel *bridge_channel,
1951  struct blind_transfer_data *blind_data)
1952 {
1953  ast_async_goto(bridge_channel->chan, blind_data->context, blind_data->exten, 1);
1954  ast_bridge_channel_kick(bridge_channel, AST_CAUSE_NORMAL_CLEARING);
1955 }
1956 
1957 /*!
1958  * \internal
1959  * \brief Perform an attended transfer on a channel in a bridge
1960  */
1961 static void bridge_channel_attended_transfer(struct ast_bridge_channel *bridge_channel,
1962  const char *target_chan_name)
1963 {
1964  RAII_VAR(struct ast_channel *, chan_target, NULL, ao2_cleanup);
1965  RAII_VAR(struct ast_channel *, chan_bridged, NULL, ao2_cleanup);
1966 
1967  chan_target = ast_channel_get_by_name(target_chan_name);
1968  if (!chan_target) {
1969  /* Dang, it disappeared somehow */
1970  ast_bridge_channel_kick(bridge_channel, AST_CAUSE_NORMAL_CLEARING);
1971  return;
1972  }
1973 
1974  ast_bridge_channel_lock(bridge_channel);
1975  chan_bridged = bridge_channel->chan;
1976  ast_assert(chan_bridged != NULL);
1977  ao2_ref(chan_bridged, +1);
1978  ast_bridge_channel_unlock(bridge_channel);
1979 
1980  if (ast_bridge_set_after_callback(chan_bridged, after_bridge_move_channel,
1981  after_bridge_move_channel_fail, ast_channel_ref(chan_target))) {
1982  ast_softhangup(chan_target, AST_SOFTHANGUP_DEV);
1983 
1984  /* Release the ref we tried to pass to ast_bridge_set_after_callback(). */
1985  ast_channel_unref(chan_target);
1986  }
1987  ast_bridge_channel_kick(bridge_channel, AST_CAUSE_NORMAL_CLEARING);
1988 }
1989 
1990 /*!
1991  * \internal
1992  * \brief Handle bridge channel bridge action frame.
1993  * \since 12.0.0
1994  *
1995  * \param bridge_channel Channel to execute the action on.
1996  * \param action What to do.
1997  * \param data data from the action.
1998  */
1999 static void bridge_channel_handle_action(struct ast_bridge_channel *bridge_channel,
2000  enum bridge_channel_action_type action, void *data)
2001 {
2002  switch (action) {
2004  bridge_channel_suspend(bridge_channel);
2005  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2006  bridge_channel_dtmf_stream(bridge_channel, data);
2007  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2008  bridge_channel_unsuspend(bridge_channel);
2009  break;
2012  bridge_channel_talking(bridge_channel,
2014  break;
2016  bridge_channel_suspend(bridge_channel);
2017  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2018  bridge_channel_playfile(bridge_channel, data);
2019  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2020  bridge_channel_unsuspend(bridge_channel);
2021  break;
2023  bridge_channel_suspend(bridge_channel);
2024  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2025  bridge_channel_run_app(bridge_channel, data);
2026  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2027  bridge_channel_unsuspend(bridge_channel);
2028  break;
2030  bridge_channel_do_callback(bridge_channel, data);
2031  break;
2033  bridge_channel_suspend(bridge_channel);
2034  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2035  bridge_channel_park(bridge_channel, data);
2036  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2037  bridge_channel_unsuspend(bridge_channel);
2038  break;
2040  bridge_channel_blind_transfer(bridge_channel, data);
2041  break;
2043  bridge_channel_attended_transfer(bridge_channel, data);
2044  break;
2045  default:
2046  break;
2047  }
2048 
2049  /* While invoking an action it is possible for the channel to be hung up. So
2050  * that the bridge respects this we check here and if hung up kick it out.
2051  */
2052  if (bridge_channel->chan && ast_check_hangup_locked(bridge_channel->chan)) {
2053  ast_bridge_channel_kick(bridge_channel, 0);
2054  }
2055 }
2056 
2057 /*!
2058  * \internal
2059  * \brief Check if a bridge should dissolve and do it.
2060  * \since 12.0.0
2061  *
2062  * \param bridge_channel Channel causing the check.
2063  *
2064  * \note On entry, bridge_channel->bridge is already locked.
2065  */
2066 static void bridge_channel_dissolve_check(struct ast_bridge_channel *bridge_channel)
2067 {
2068  struct ast_bridge *bridge = bridge_channel->bridge;
2069 
2070  if (bridge->dissolved) {
2071  return;
2072  }
2073 
2074  if (!bridge->num_channels
2075  && ast_test_flag(&bridge->feature_flags, AST_BRIDGE_FLAG_DISSOLVE_EMPTY)) {
2076  /* Last channel leaving the bridge turns off the lights. */
2077  bridge_dissolve(bridge, ast_channel_hangupcause(bridge_channel->chan));
2078  return;
2079  }
2080 
2081  switch (bridge_channel->state) {
2083  /* Do we need to dissolve the bridge because this channel hung up? */
2084  if (ast_test_flag(&bridge->feature_flags, AST_BRIDGE_FLAG_DISSOLVE_HANGUP)
2085  || (bridge_channel->features->usable
2086  && ast_test_flag(&bridge_channel->features->feature_flags,
2088  bridge_dissolve(bridge, ast_channel_hangupcause(bridge_channel->chan));
2089  return;
2090  }
2091  break;
2092  default:
2093  break;
2094  }
2095 
2096  if (bridge->num_lonely && bridge->num_lonely == bridge->num_channels) {
2097  /*
2098  * This will start a chain reaction where each channel leaving
2099  * enters this function and causes the next to leave as long as
2100  * there aren't non-lonely channels in the bridge.
2101  */
2104  ast_channel_hangupcause(bridge_channel->chan));
2105  }
2106 }
2107 
2108 void bridge_channel_internal_pull(struct ast_bridge_channel *bridge_channel)
2109 {
2110  struct ast_bridge *bridge = bridge_channel->bridge;
2111 
2112  if (!bridge_channel->in_bridge) {
2113  return;
2114  }
2115  bridge_channel->in_bridge = 0;
2116 
2117  ast_debug(1, "Bridge %s: pulling %p(%s)\n",
2118  bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan));
2119 
2120  ast_verb(3, "Channel %s left '%s' %s-bridge <%s>\n",
2121  ast_channel_name(bridge_channel->chan),
2122  bridge->technology->name,
2123  bridge->v_table->name,
2124  bridge->uniqueid);
2125 
2126  if (!bridge_channel->just_joined) {
2127  /* Tell the bridge technology we are leaving so they tear us down */
2128  ast_debug(1, "Bridge %s: %p(%s) is leaving %s technology\n",
2129  bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan),
2130  bridge->technology->name);
2131  if (bridge->technology->leave) {
2132  bridge->technology->leave(bridge, bridge_channel);
2133  }
2134  }
2135 
2136  /* Remove channel from the bridge */
2137  if (!bridge_channel->suspended) {
2138  --bridge->num_active;
2139  }
2140  if (ast_test_flag(&bridge_channel->features->feature_flags, AST_BRIDGE_CHANNEL_FLAG_LONELY)) {
2141  --bridge->num_lonely;
2142  }
2143  --bridge->num_channels;
2144  AST_LIST_REMOVE(&bridge->channels, bridge_channel, entry);
2145 
2146  bridge_channel_dissolve_check(bridge_channel);
2147  bridge->v_table->pull(bridge, bridge_channel);
2148 
2149  ast_bridge_channel_clear_roles(bridge_channel);
2150 
2151  /* If we are not going to be hung up after leaving a bridge, and we were an
2152  * outgoing channel, clear the outgoing flag.
2153  */
2154  if (ast_test_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_OUTGOING)
2155  && (ast_channel_is_leaving_bridge(bridge_channel->chan)
2156  || bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT)) {
2157  ast_debug(2, "Channel %s will survive this bridge; clearing outgoing (dialed) flag\n", ast_channel_name(bridge_channel->chan));
2158  ast_channel_clear_flag(bridge_channel->chan, AST_FLAG_OUTGOING);
2159  }
2160 
2161  bridge->reconfigured = 1;
2162  ast_bridge_publish_leave(bridge, bridge_channel->chan);
2163 }
2164 
2165 int bridge_channel_internal_push_full(struct ast_bridge_channel *bridge_channel, int optimized)
2166 {
2167  struct ast_bridge *bridge = bridge_channel->bridge;
2168  struct ast_bridge_channel *swap;
2169 
2170  ast_assert(!bridge_channel->in_bridge);
2171 
2172  swap = bridge_find_channel(bridge, bridge_channel->swap);
2173  bridge_channel->swap = NULL;
2174 
2175  if (swap) {
2176  ast_debug(1, "Bridge %s: pushing %p(%s) by swapping with %p(%s)\n",
2177  bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan),
2178  swap, ast_channel_name(swap->chan));
2179  } else {
2180  ast_debug(1, "Bridge %s: pushing %p(%s)\n",
2181  bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan));
2182  }
2183 
2184  /* Add channel to the bridge */
2185  if (bridge->dissolved
2186  || bridge_channel->state != BRIDGE_CHANNEL_STATE_WAIT
2187  || (swap && swap->state != BRIDGE_CHANNEL_STATE_WAIT)
2188  || bridge->v_table->push(bridge, bridge_channel, swap)) {
2189  ast_debug(1, "Bridge %s: pushing %p(%s) into bridge failed\n",
2190  bridge->uniqueid, bridge_channel, ast_channel_name(bridge_channel->chan));
2191  return -1;
2192  }
2193 
2194  ast_bridge_channel_establish_roles(bridge_channel);
2195 
2196  if (swap) {
2197  int dissolve = ast_test_flag(&bridge->feature_flags, AST_BRIDGE_FLAG_DISSOLVE_EMPTY);
2198 
2199  /* This flag is cleared so the act of this channel leaving does not cause it to dissolve if need be */
2200  ast_clear_flag(&bridge->feature_flags, AST_BRIDGE_FLAG_DISSOLVE_EMPTY);
2201 
2202  if (optimized) {
2203  bridge_channel_cancel_owed_events(swap);
2204  }
2206  bridge_channel_internal_pull(swap);
2207 
2208  ast_set2_flag(&bridge->feature_flags, dissolve, AST_BRIDGE_FLAG_DISSOLVE_EMPTY);
2209  }
2210 
2211  bridge_channel->in_bridge = 1;
2212  bridge_channel->just_joined = 1;
2213  AST_LIST_INSERT_TAIL(&bridge->channels, bridge_channel, entry);
2214  ++bridge->num_channels;
2215  if (ast_test_flag(&bridge_channel->features->feature_flags, AST_BRIDGE_CHANNEL_FLAG_LONELY)) {
2216  ++bridge->num_lonely;
2217  }
2218  if (!bridge_channel->suspended) {
2219  ++bridge->num_active;
2220  }
2221 
2222  ast_verb(3, "Channel %s %s%s%s '%s' %s-bridge <%s>\n",
2223  ast_channel_name(bridge_channel->chan),
2224  swap ? "swapped with " : "joined",
2225  swap ? ast_channel_name(swap->chan) : "",
2226  swap ? " into" : "",
2227  bridge->technology->name,
2228  bridge->v_table->name,
2229  bridge->uniqueid);
2230 
2231  ast_bridge_publish_enter(bridge, bridge_channel->chan, swap ? swap->chan : NULL);
2232 
2233  /* Clear any BLINDTRANSFER,ATTENDEDTRANSFER and FORWARDERNAME since the transfer has completed. */
2234  pbx_builtin_setvar_helper(bridge_channel->chan, "BLINDTRANSFER", NULL);
2235  pbx_builtin_setvar_helper(bridge_channel->chan, "ATTENDEDTRANSFER", NULL);
2236  pbx_builtin_setvar_helper(bridge_channel->chan, "FORWARDERNAME", NULL);
2237 
2238  /* Wake up the bridge channel thread to reevaluate any interval timers. */
2239  ast_queue_frame(bridge_channel->chan, &ast_null_frame);
2240 
2241  bridge->reconfigured = 1;
2242  return 0;
2243 }
2244 
2245 int bridge_channel_internal_push(struct ast_bridge_channel *bridge_channel)
2246 {
2247  return bridge_channel_internal_push_full(bridge_channel, 0);
2248 }
2249 
2250 /*!
2251  * \internal
2252  * \brief Handle bridge channel control frame action.
2253  * \since 12.0.0
2254  *
2255  * \param bridge_channel Channel to execute the control frame action on.
2256  * \param fr Control frame to handle.
2257  */
2258 static void bridge_channel_handle_control(struct ast_bridge_channel *bridge_channel, struct ast_frame *fr)
2259 {
2260  struct ast_channel *chan;
2261  struct ast_option_header *aoh;
2262 
2263  chan = bridge_channel->chan;
2264  switch (fr->subclass.integer) {
2266  if (ast_channel_redirecting_sub(NULL, chan, fr, 1)) {
2267  ast_indicate_data(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
2268  }
2269  break;
2271  if (ast_channel_connected_line_sub(NULL, chan, fr, 1)) {
2272  ast_indicate_data(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
2273  }
2274  break;
2275  case AST_CONTROL_OPTION:
2276  /*
2277  * Forward option Requests, but only ones we know are safe These
2278  * are ONLY sent by chan_iax2 and I'm not convinced that they
2279  * are useful. I haven't deleted them entirely because I just am
2280  * not sure of the ramifications of removing them.
2281  */
2282  aoh = fr->data.ptr;
2283  if (aoh && aoh->flag == AST_OPTION_FLAG_REQUEST) {
2284  switch (ntohs(aoh->option)) {
2286  case AST_OPTION_TDD:
2287  case AST_OPTION_RELAXDTMF:
2288  case AST_OPTION_AUDIO_MODE:
2290  case AST_OPTION_FAX_DETECT:
2291  ast_channel_setoption(chan, ntohs(aoh->option), aoh->data,
2292  fr->datalen - sizeof(*aoh), 0);
2293  break;
2294  default:
2295  break;
2296  }
2297  }
2298  break;
2299  case AST_CONTROL_ANSWER:
2300  if (ast_channel_state(chan) != AST_STATE_UP) {
2301  ast_answer(chan);
2302  ast_bridge_channel_lock_bridge(bridge_channel);
2303  bridge_channel->bridge->reconfigured = 1;
2304  bridge_reconfigured(bridge_channel->bridge, 0);
2305  ast_bridge_unlock(bridge_channel->bridge);
2306  } else {
2307  ast_indicate(chan, -1);
2308  }
2309  break;
2311  /* Should never happen. */
2312  ast_assert(0);
2313  break;
2315  ast_indicate_data(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
2316  break;
2317  default:
2318  ast_indicate_data(chan, fr->subclass.integer, fr->data.ptr, fr->datalen);
2319  break;
2320  }
2321 }
2322 
2323 /*!
2324  * \internal
2325  * \brief Ensure text data is zero terminated before sending
2326  *
2327  * \param chan Channel to send text to
2328  * \param f The frame containing the text data to send
2329  */
2330 static void sendtext_safe(struct ast_channel *chan, const struct ast_frame *f)
2331 {
2332  if (f->datalen) {
2333  char *text = f->data.ptr;
2334 
2335  if (text[f->datalen - 1]) {
2336  /* Not zero terminated, we need to allocate */
2337  text = ast_strndup(text, f->datalen);
2338  if (!text) {
2339  return;
2340  }
2341  }
2342 
2343  ast_sendtext(chan, text);
2344 
2345  if (text != f->data.ptr) {
2346  /* Only free if we allocated */
2347  ast_free(text);
2348  }
2349  } else {
2350  /* Special case if the frame length is zero (although I
2351  * am not sure this is possible?) */
2352  ast_sendtext(chan, "");
2353  }
2354 }
2355 
2356 /*!
2357  * \internal
2358  * \brief Handle bridge channel write frame to channel.
2359  * \since 12.0.0
2360  *
2361  * \param bridge_channel Channel to write outgoing frame.
2362  */
2363 static void bridge_channel_handle_write(struct ast_bridge_channel *bridge_channel)
2364 {
2365  struct ast_frame *fr;
2366  struct sync_payload *sync_payload;
2367  int num;
2368  struct ast_msg_data *msg;
2369 
2370  ast_bridge_channel_lock(bridge_channel);
2371 
2372  /* It's not good to have unbalanced frames and alert_pipe alerts. */
2373  ast_assert(!AST_LIST_EMPTY(&bridge_channel->wr_queue));
2374  if (AST_LIST_EMPTY(&bridge_channel->wr_queue)) {
2375  /* No frame, flush the alert pipe of excess alerts. */
2376  ast_log(LOG_WARNING, "Weird. No frame from bridge for %s to process?\n",
2377  ast_channel_name(bridge_channel->chan));
2378  ast_alertpipe_read(bridge_channel->alert_pipe);
2379  ast_bridge_channel_unlock(bridge_channel);
2380  return;
2381  }
2382 
2383  AST_LIST_TRAVERSE_SAFE_BEGIN(&bridge_channel->wr_queue, fr, frame_list) {
2384  if (bridge_channel->dtmf_hook_state.collected[0]) {
2385  switch (fr->frametype) {
2388  /* Defer processing these frames while DTMF is collected. */
2389  continue;
2390  default:
2391  break;
2392  }
2393  }
2394  ast_alertpipe_read(bridge_channel->alert_pipe);
2396  break;
2397  }
2399 
2400  ast_bridge_channel_unlock(bridge_channel);
2401 
2402  if (!fr) {
2403  /*
2404  * Wait some to reduce CPU usage from a tight loop
2405  * without any wait because we only have deferred
2406  * frames in the wr_queue.
2407  */
2408  usleep(1);
2409  return;
2410  }
2411 
2412  switch (fr->frametype) {
2414  bridge_channel_handle_action(bridge_channel, fr->subclass.integer, fr->data.ptr);
2415  break;
2417  sync_payload = fr->data.ptr;
2418  bridge_channel_handle_action(bridge_channel, fr->subclass.integer, sync_payload->data);
2419  break;
2420  case AST_FRAME_CONTROL:
2421  bridge_channel_handle_control(bridge_channel, fr);
2422  break;
2423  case AST_FRAME_NULL:
2424  break;
2425  case AST_FRAME_TEXT:
2426  ast_debug(1, "Sending TEXT frame to '%s': %*.s\n",
2427  ast_channel_name(bridge_channel->chan), fr->datalen, (char *)fr->data.ptr);
2428  sendtext_safe(bridge_channel->chan, fr);
2429  break;
2430  case AST_FRAME_TEXT_DATA:
2431  msg = (struct ast_msg_data *)fr->data.ptr;
2432  ast_debug(1, "Sending TEXT_DATA frame from '%s' to '%s:%s': %s\n",
2433  ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_FROM),
2434  ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_TO),
2435  ast_channel_name(bridge_channel->chan),
2436  ast_msg_data_get_attribute(msg, AST_MSG_DATA_ATTR_BODY));
2437  ast_sendtext_data(bridge_channel->chan, msg);
2438  break;
2439  default:
2440  /* Assume that there is no mapped stream for this */
2441  num = -1;
2442 
2443  if (fr->stream_num > -1) {
2444  ast_bridge_channel_lock(bridge_channel);
2445  if (fr->stream_num < (int)AST_VECTOR_SIZE(&bridge_channel->stream_map.to_channel)) {
2446  num = AST_VECTOR_GET(&bridge_channel->stream_map.to_channel, fr->stream_num);
2447  }
2448  ast_bridge_channel_unlock(bridge_channel);
2449 
2450  /* If there is no mapped stream after checking the mapping then there is nowhere
2451  * to write this frame to, so drop it.
2452  */
2453  if (num == -1) {
2454  break;
2455  }
2456  }
2457 
2458  /* Write the frame to the channel. */
2459  bridge_channel->activity = BRIDGE_CHANNEL_THREAD_SIMPLE;
2460  ast_write_stream(bridge_channel->chan, num, fr);
2461  break;
2462  }
2463  bridge_frame_free(fr);
2464 }
2465 
2466 /*!
2467  * \internal
2468  * \brief Handle DTMF from a channel
2469  */
2470 static struct ast_frame *bridge_handle_dtmf(struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
2471 {
2472  struct ast_bridge_features *features = bridge_channel->features;
2473  struct ast_bridge_hook_dtmf *hook = NULL;
2474  char dtmf[2];
2475 
2476  /*
2477  * See if we are already matching a DTMF feature hook sequence or
2478  * if this DTMF matches the beginning of any DTMF feature hooks.
2479  */
2480  dtmf[0] = frame->subclass.integer;
2481  dtmf[1] = '\0';
2482  if (bridge_channel->dtmf_hook_state.collected[0]
2483  || (hook = ao2_find(features->dtmf_hooks, dtmf, OBJ_SEARCH_PARTIAL_KEY))) {
2484  enum ast_frame_type frametype = frame->frametype;
2485 
2486  bridge_frame_free(frame);
2487  frame = NULL;
2488 
2489  ao2_cleanup(hook);
2490 
2491  switch (frametype) {
2492  case AST_FRAME_DTMF_BEGIN:
2493  /* Just eat the frame. */
2494  break;
2495  case AST_FRAME_DTMF_END:
2496  ast_bridge_channel_feature_digit(bridge_channel, dtmf[0]);
2497  break;
2498  default:
2499  /* Unexpected frame type. */
2500  ast_assert(0);
2501  break;
2502  }
2503 #ifdef TEST_FRAMEWORK
2504  } else if (frame->frametype == AST_FRAME_DTMF_END) {
2505  /* Only transmit this event on DTMF end or else every DTMF
2506  * press will result in the event being broadcast twice
2507  */
2508  ast_test_suite_event_notify("FEATURE_DETECTION", "Result: fail");
2509 #endif
2510  }
2511 
2512  return frame;
2513 }
2514 
2515 static const char *controls[] = {
2516  [AST_CONTROL_RINGING] = "RINGING",
2517  [AST_CONTROL_PROCEEDING] = "PROCEEDING",
2518  [AST_CONTROL_PROGRESS] = "PROGRESS",
2519  [AST_CONTROL_BUSY] = "BUSY",
2520  [AST_CONTROL_CONGESTION] = "CONGESTION",
2521  [AST_CONTROL_ANSWER] = "ANSWER",
2522 };
2523 
2524 /*!
2525  * \internal
2526  * \brief Feed notification that a frame is waiting on a channel into the bridging core
2527  *
2528  * \param bridge_channel Bridge channel the notification was received on
2529  */
2530 static void bridge_handle_trip(struct ast_bridge_channel *bridge_channel)
2531 {
2532  struct ast_frame *frame;
2533  int blocked;
2534 
2535  if (!ast_strlen_zero(ast_channel_call_forward(bridge_channel->chan))) {
2536  /* TODO If early bridging is ever used by anything other than ARI,
2537  * it's important that we actually attempt to handle the call forward
2538  * attempt, as well as expand features on a bridge channel to allow/disallow
2539  * call forwarding. For now, all we do is raise an event, showing that
2540  * a call forward is being attempted.
2541  */
2542  ast_channel_publish_dial_forward(NULL, bridge_channel->chan, NULL, NULL, "CANCEL",
2543  ast_channel_call_forward(bridge_channel->chan));
2544  }
2545 
2546  if (bridge_channel->features->mute) {
2547  frame = ast_read_stream_noaudio(bridge_channel->chan);
2548  } else {
2549  frame = ast_read_stream(bridge_channel->chan);
2550  }
2551 
2552  if (!frame) {
2553  ast_bridge_channel_kick(bridge_channel, 0);
2554  return;
2555  }
2556 
2557  if (!ast_channel_is_multistream(bridge_channel->chan)) {
2558  /* This may not be initialized by non-multistream channel drivers */
2559  frame->stream_num = -1;
2560  }
2561 
2562  switch (frame->frametype) {
2563  case AST_FRAME_CONTROL:
2564  switch (frame->subclass.integer) {
2566  case AST_CONTROL_BUSY:
2567  ast_channel_publish_dial(NULL, bridge_channel->chan, NULL, controls[frame->subclass.integer]);
2568  break;
2569  case AST_CONTROL_HANGUP:
2570  ast_bridge_channel_kick(bridge_channel, 0);
2571  bridge_frame_free(frame);
2572  return;
2573  case AST_CONTROL_RINGING:
2574  case AST_CONTROL_PROGRESS:
2576  case AST_CONTROL_ANSWER:
2577  ast_channel_publish_dial(NULL, bridge_channel->chan, NULL, controls[frame->subclass.integer]);
2578  break;
2580  ast_bridge_channel_lock_bridge(bridge_channel);
2581  blocked = bridge_channel->bridge->technology->stream_topology_request_change
2582  && bridge_channel->bridge->technology->stream_topology_request_change(
2583  bridge_channel->bridge, bridge_channel);
2584  ast_bridge_unlock(bridge_channel->bridge);
2585  if (blocked) {
2586  /*
2587  * Topology change was intercepted by the bridge technology
2588  * so drop frame.
2589  */
2590  bridge_frame_free(frame);
2591  return;
2592  }
2593  break;
2595  /*
2596  * If a stream topology has changed then the bridge_channel's
2597  * media mapping needs to be updated.
2598  */
2599  ast_bridge_channel_lock_bridge(bridge_channel);
2600  if (bridge_channel->bridge->technology->stream_topology_changed) {
2601  bridge_channel->bridge->technology->stream_topology_changed(
2602  bridge_channel->bridge, bridge_channel);
2603  } else {
2604  ast_bridge_channel_stream_map(bridge_channel);
2605  }
2606  ast_bridge_unlock(bridge_channel->bridge);
2607  break;
2608  default:
2609  break;
2610  }
2611  break;
2612  case AST_FRAME_DTMF_BEGIN:
2613  case AST_FRAME_DTMF_END:
2614  frame = bridge_handle_dtmf(bridge_channel, frame);
2615  if (!frame) {
2616  return;
2617  }
2618  if (!bridge_channel->features->dtmf_passthrough) {
2619  bridge_frame_free(frame);
2620  return;
2621  }
2622  break;
2623  default:
2624  break;
2625  }
2626 
2627  /* Simply write the frame out to the bridge technology. */
2628  bridge_channel_write_frame(bridge_channel, frame);
2629  bridge_frame_free(frame);
2630 }
2631 
2632 /*!
2633  * \internal
2634  * \brief Determine how long till the next timer interval.
2635  * \since 12.0.0
2636  *
2637  * \param bridge_channel Channel to determine how long can wait.
2638  *
2639  * \retval ms Number of milliseconds to wait.
2640  * \retval -1 to wait forever.
2641  */
2642 static int bridge_channel_next_interval(struct ast_bridge_channel *bridge_channel)
2643 {
2644  struct ast_heap *interval_hooks = bridge_channel->features->interval_hooks;
2645  struct ast_bridge_hook_timer *hook;
2646  int ms;
2647 
2648  ast_heap_wrlock(interval_hooks);
2649  hook = ast_heap_peek(interval_hooks, 1);
2650  if (hook) {
2651  ms = ast_tvdiff_ms(hook->timer.trip_time, ast_tvnow());
2652  if (ms < 0) {
2653  /* Expire immediately. An interval hook is ready to run. */
2654  ms = 0;
2655  }
2656  } else {
2657  /* No hook so wait forever. */
2658  ms = -1;
2659  }
2660  ast_heap_unlock(interval_hooks);
2661 
2662  return ms;
2663 }
2664 
2665 /*!
2666  * \internal
2667  * \brief Determine how long till the DTMF interdigit timeout.
2668  * \since 12.8.0
2669  *
2670  * \param bridge_channel Channel to determine how long can wait.
2671  *
2672  * \retval ms Number of milliseconds to wait.
2673  * \retval -1 to wait forever.
2674  */
2675 static int bridge_channel_feature_timeout(struct ast_bridge_channel *bridge_channel)
2676 {
2677  int ms;
2678 
2679  if (bridge_channel->dtmf_hook_state.collected[0]) {
2680  ms = ast_tvdiff_ms(bridge_channel->dtmf_hook_state.interdigit_timeout,
2681  ast_tvnow());
2682  if (ms < 0) {
2683  /* Expire immediately. */
2684  ms = 0;
2685  }
2686  } else {
2687  /* Timer is not active so wait forever. */
2688  ms = -1;
2689  }
2690 
2691  return ms;
2692 }
2693 
2694 /*!
2695  * \internal
2696  * \brief Determine how long till a timeout.
2697  * \since 12.8.0
2698  *
2699  * \param bridge_channel Channel to determine how long can wait.
2700  *
2701  * \retval ms Number of milliseconds to wait.
2702  * \retval -1 to wait forever.
2703  */
2704 static int bridge_channel_next_timeout(struct ast_bridge_channel *bridge_channel)
2705 {
2706  int ms_interval;
2707  int ms;
2708 
2709  ms_interval = bridge_channel_next_interval(bridge_channel);
2710  ms = bridge_channel_feature_timeout(bridge_channel);
2711  if (ms < 0 || (0 <= ms_interval && ms_interval < ms)) {
2712  /* Interval hook timeout is next. */
2713  ms = ms_interval;
2714  }
2715 
2716  return ms;
2717 }
2718 
2719 /*!
2720  * \internal
2721  * \brief Wait for something to happen on the bridge channel and handle it.
2722  * \since 12.0.0
2723  *
2724  * \param bridge_channel Channel to wait.
2725  *
2726  * \note Each channel does writing/reading in their own thread.
2727  */
2728 static void bridge_channel_wait(struct ast_bridge_channel *bridge_channel)
2729 {
2730  int ms;
2731  int outfd;
2732  struct ast_channel *chan;
2733 
2734  /* Wait for data to either come from the channel or us to be signaled */
2735  ast_bridge_channel_lock(bridge_channel);
2736  if (bridge_channel->state != BRIDGE_CHANNEL_STATE_WAIT) {
2737  } else if (bridge_channel->suspended) {
2738 /* XXX ASTERISK-21271 the external party use of suspended will go away as will these references because this is the bridge channel thread */
2739  ast_debug(1, "Bridge %s: %p(%s) is going into a signal wait\n",
2740  bridge_channel->bridge->uniqueid, bridge_channel,
2741  ast_channel_name(bridge_channel->chan));
2742  ast_cond_wait(&bridge_channel->cond, ao2_object_get_lockaddr(bridge_channel));
2743  } else {
2744  ast_bridge_channel_unlock(bridge_channel);
2745  outfd = -1;
2746  ms = bridge_channel_next_timeout(bridge_channel);
2747  chan = ast_waitfor_nandfds(&bridge_channel->chan, 1,
2748  &bridge_channel->alert_pipe[0], 1, NULL, &outfd, &ms);
2749  if (ast_channel_unbridged(bridge_channel->chan)) {
2750  ast_channel_set_unbridged(bridge_channel->chan, 0);
2751  ast_bridge_channel_lock_bridge(bridge_channel);
2752  bridge_channel->bridge->reconfigured = 1;
2753  bridge_reconfigured(bridge_channel->bridge, 0);
2754  ast_bridge_unlock(bridge_channel->bridge);
2755  }
2756  ast_bridge_channel_lock(bridge_channel);
2757  bridge_channel->activity = BRIDGE_CHANNEL_THREAD_FRAME;
2758  ast_bridge_channel_unlock(bridge_channel);
2759  if (!bridge_channel->suspended
2760  && bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {
2761  if (chan) {
2762  bridge_handle_trip(bridge_channel);
2763  } else if (ms == 0) {
2764  /* An interdigit timeout or interval expired. */
2765  bridge_channel_handle_feature_timeout(bridge_channel);
2766  bridge_channel_handle_interval(bridge_channel);
2767  } else if (-1 < outfd) {
2768  /*
2769  * Must do this after checking timeouts or may have
2770  * an infinite loop due to deferring write queue
2771  * actions while trying to match DTMF feature hooks.
2772  */
2773  bridge_channel_handle_write(bridge_channel);
2774  }
2775  }
2776  bridge_channel->activity = BRIDGE_CHANNEL_THREAD_IDLE;
2777  return;
2778  }
2779  ast_bridge_channel_unlock(bridge_channel);
2780 }
2781 
2782 /*!
2783  * \internal
2784  * \brief Handle bridge channel join/leave event.
2785  * \since 12.0.0
2786  *
2787  * \param bridge_channel Which channel is involved.
2788  * \param type Specified join/leave event.
2789  */
2790 static void bridge_channel_event_join_leave(struct ast_bridge_channel *bridge_channel, enum ast_bridge_hook_type type)
2791 {
2792  struct ast_bridge_features *features = bridge_channel->features;
2793  struct ast_bridge_hook *hook;
2794  struct ao2_iterator iter;
2795 
2796  /* Run the specified hooks. */
2797  iter = ao2_iterator_init(features->other_hooks, 0);
2798  for (; (hook = ao2_iterator_next(&iter)); ao2_ref(hook, -1)) {
2799  if (hook->type == type) {
2800  break;
2801  }
2802  }
2803  if (hook) {
2804  /* Found the first specified hook to run. */
2805  bridge_channel_suspend(bridge_channel);
2806  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2807  do {
2808  if (hook->type == type) {
2809  hook->callback(bridge_channel, hook->hook_pvt);
2810  ao2_unlink(features->other_hooks, hook);
2811  }
2812  ao2_ref(hook, -1);
2813  } while ((hook = ao2_iterator_next(&iter)));
2814  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCUPDATE);
2815  bridge_channel_unsuspend(bridge_channel);
2816  }
2817  ao2_iterator_destroy(&iter);
2818 }
2819 
2820 int bridge_channel_internal_join(struct ast_bridge_channel *bridge_channel)
2821 {
2822  int res = 0;
2823  uint8_t indicate_src_change = 0;
2824  struct ast_bridge_features *channel_features;
2825  struct ast_channel *peer;
2826  struct ast_channel *swap;
2827 
2828  ast_debug(1, "Bridge %s: %p(%s) is joining\n",
2829  bridge_channel->bridge->uniqueid,
2830  bridge_channel, ast_channel_name(bridge_channel->chan));
2831 
2832  /*
2833  * Directly locking the bridge is safe here because nobody else
2834  * knows about this bridge_channel yet.
2835  */
2836  ast_bridge_lock(bridge_channel->bridge);
2837 
2838  ast_channel_lock(bridge_channel->chan);
2839  peer = ast_local_get_peer(bridge_channel->chan);
2840 
2841  if (peer) {
2842  struct ast_bridge *peer_bridge;
2843 
2844  ast_channel_unlock(bridge_channel->chan);
2845 
2846  ast_channel_lock(peer);
2847  peer_bridge = ast_channel_internal_bridge(peer);
2848  ast_channel_unlock(peer);
2849  ast_channel_unref(peer);
2850 
2851  /* As we are only doing a pointer comparison we don't need the peer_bridge
2852  * to be reference counted or locked.
2853  */
2854  if (peer_bridge == bridge_channel->bridge) {
2855  ast_bridge_unlock(bridge_channel->bridge);
2856  ast_debug(1, "Bridge %s: %p(%s) denying Bridge join to prevent Local channel loop\n",
2857  bridge_channel->bridge->uniqueid,
2858  bridge_channel,
2859  ast_channel_name(bridge_channel->chan));
2860  return -1;
2861  }
2862 
2863  ast_channel_lock(bridge_channel->chan);
2864  }
2865 
2866  bridge_channel->read_format = ao2_bump(ast_channel_readformat(bridge_channel->chan));
2867  bridge_channel->write_format = ao2_bump(ast_channel_writeformat(bridge_channel->chan));
2868 
2869  /* Make sure we're still good to be put into a bridge */
2870  if (ast_channel_internal_bridge(bridge_channel->chan)
2871  || ast_test_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_ZOMBIE)) {
2872  ast_channel_unlock(bridge_channel->chan);
2873  ast_bridge_unlock(bridge_channel->bridge);
2874  ast_debug(1, "Bridge %s: %p(%s) failed to join Bridge\n",
2875  bridge_channel->bridge->uniqueid,
2876  bridge_channel,
2877  ast_channel_name(bridge_channel->chan));
2878  return -1;
2879  }
2880  ast_channel_internal_bridge_set(bridge_channel->chan, bridge_channel->bridge);
2881 
2882  /* Attach features requested by the channel */
2883  channel_features = ast_channel_feature_hooks_get(bridge_channel->chan);
2884  if (channel_features) {
2885  ast_bridge_features_merge(bridge_channel->features, channel_features);
2886  }
2887  ast_channel_unlock(bridge_channel->chan);
2888 
2889  /* Add the jitterbuffer if the channel requires it */
2890  ast_jb_enable_for_channel(bridge_channel->chan);
2891 
2892  if (!bridge_channel->bridge->callid) {
2893  bridge_channel->bridge->callid = ast_read_threadstorage_callid();
2894  }
2895 
2896  /* Take the swap channel ref from the bridge_channel struct. */
2897  swap = bridge_channel->swap;
2898 
2899  if (bridge_channel_internal_push(bridge_channel)) {
2900  int cause = bridge_channel->bridge->cause;
2901 
2902  ast_bridge_unlock(bridge_channel->bridge);
2903  ast_bridge_channel_kick(bridge_channel, cause);
2904  ast_bridge_channel_lock_bridge(bridge_channel);
2905  ast_bridge_features_remove(bridge_channel->features,
2907  bridge_channel_dissolve_check(bridge_channel);
2908  res = -1;
2909  }
2910  bridge_reconfigured(bridge_channel->bridge, !bridge_channel->inhibit_colp);
2911 
2912  if (bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {
2913  /*
2914  * Indicate a source change since this channel is entering the
2915  * bridge system only if the bridge technology is not MULTIMIX
2916  * capable. The MULTIMIX technology has already done it.
2917  */
2918  if (!(bridge_channel->bridge->technology->capabilities
2920  indicate_src_change = 1;
2921  }
2922 
2923  bridge_channel_impart_signal(bridge_channel->chan);
2924  ast_bridge_unlock(bridge_channel->bridge);
2925 
2926  /* Must release any swap ref after unlocking the bridge. */
2927  ao2_t_cleanup(swap, "Bridge push with swap successful");
2928  swap = NULL;
2929 
2930  if (indicate_src_change) {
2931  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCCHANGE);
2932  }
2933 
2934  bridge_channel_event_join_leave(bridge_channel, AST_BRIDGE_HOOK_TYPE_JOIN);
2935 
2936  while (bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {
2937  /* Wait for something to do. */
2938  bridge_channel_wait(bridge_channel);
2939  }
2940 
2941  /* Force a timeout on any accumulated DTMF hook digits. */
2942  ast_bridge_channel_feature_digit(bridge_channel, 0);
2943 
2944  bridge_channel_event_join_leave(bridge_channel, AST_BRIDGE_HOOK_TYPE_LEAVE);
2945  ast_bridge_channel_lock_bridge(bridge_channel);
2946  }
2947 
2948  bridge_channel_internal_pull(bridge_channel);
2949  bridge_channel_settle_owed_events(bridge_channel->bridge, bridge_channel);
2950  bridge_reconfigured(bridge_channel->bridge, 1);
2951 
2952  /* Remove ourselves if we are the video source */
2953  ast_bridge_remove_video_src(bridge_channel->bridge, bridge_channel->chan);
2954 
2955  ast_bridge_unlock(bridge_channel->bridge);
2956 
2957  /* Must release any swap ref after unlocking the bridge. */
2958  ao2_t_cleanup(swap, "Bridge push with swap failed or exited immediately");
2959 
2960  /* Complete any active hold before exiting the bridge. */
2961  if (ast_channel_hold_state(bridge_channel->chan) == AST_CONTROL_HOLD) {
2962  ast_debug(1, "Channel %s simulating UNHOLD for bridge end.\n",
2963  ast_channel_name(bridge_channel->chan));
2964  ast_indicate(bridge_channel->chan, AST_CONTROL_UNHOLD);
2965  }
2966 
2967  /* Complete any partial DTMF digit before exiting the bridge. */
2968  if (ast_channel_sending_dtmf_digit(bridge_channel->chan)) {
2969  ast_channel_end_dtmf(bridge_channel->chan,
2970  ast_channel_sending_dtmf_digit(bridge_channel->chan),
2971  ast_channel_sending_dtmf_tv(bridge_channel->chan), "bridge end");
2972  }
2973 
2974  /* Complete any T.38 session before exiting the bridge. */
2975  if (ast_channel_is_t38_active(bridge_channel->chan)) {
2976  struct ast_control_t38_parameters t38_parameters = {
2978  };
2979 
2980  ast_debug(1, "Channel %s simulating T.38 terminate for bridge end.\n",
2981  ast_channel_name(bridge_channel->chan));
2983  &t38_parameters, sizeof(t38_parameters));
2984  }
2985 
2986  /* Indicate a source change since this channel is leaving the bridge system. */
2987  ast_indicate(bridge_channel->chan, AST_CONTROL_SRCCHANGE);
2988 
2989  /*
2990  * Wait for any dual redirect to complete.
2991  *
2992  * Must be done while "still in the bridge" for ast_async_goto()
2993  * to work right.
2994  */
2995  while (ast_test_flag(ast_channel_flags(bridge_channel->chan), AST_FLAG_BRIDGE_DUAL_REDIRECT_WAIT)) {
2996  sched_yield();
2997  }
2998  ast_channel_lock(bridge_channel->chan);
2999  ast_channel_internal_bridge_set(bridge_channel->chan, NULL);
3000  ast_channel_unlock(bridge_channel->chan);
3001 
3002  ast_bridge_channel_restore_formats(bridge_channel);
3003 
3004  return res;
3005 }
3006 
3007 int bridge_channel_internal_queue_blind_transfer(struct ast_channel *transferee,
3008  const char *exten, const char *context,
3009  transfer_channel_cb new_channel_cb, void *user_data)
3010 {
3011  RAII_VAR(struct ast_bridge_channel *, transferee_bridge_channel, NULL, ao2_cleanup);
3012  struct blind_transfer_data blind_data;
3013 
3014  ast_channel_lock(transferee);
3015  transferee_bridge_channel = ast_channel_get_bridge_channel(transferee);
3016  ast_channel_unlock(transferee);
3017 
3018  if (!transferee_bridge_channel) {
3019  return -1;
3020  }
3021 
3022  if (new_channel_cb) {
3023  new_channel_cb(transferee, user_data, AST_BRIDGE_TRANSFER_SINGLE_PARTY);
3024  }
3025 
3026  ast_copy_string(blind_data.exten, exten, sizeof(blind_data.exten));
3027  ast_copy_string(blind_data.context, context, sizeof(blind_data.context));
3028 
3029  return bridge_channel_queue_action_data(transferee_bridge_channel,
3030  BRIDGE_CHANNEL_ACTION_BLIND_TRANSFER, &blind_data, sizeof(blind_data));
3031 }
3032 
3033 int bridge_channel_internal_queue_attended_transfer(struct ast_channel *transferee,
3034  struct ast_channel *unbridged_chan)
3035 {
3036  RAII_VAR(struct ast_bridge_channel *, transferee_bridge_channel, NULL, ao2_cleanup);
3037  char unbridged_chan_name[AST_CHANNEL_NAME];
3038 
3039  ast_channel_lock(transferee);
3040  transferee_bridge_channel = ast_channel_get_bridge_channel(transferee);
3041  ast_channel_unlock(transferee);
3042 
3043  if (!transferee_bridge_channel) {
3044  return -1;
3045  }
3046 
3047  ast_copy_string(unbridged_chan_name, ast_channel_name(unbridged_chan),
3048  sizeof(unbridged_chan_name));
3049 
3050  return bridge_channel_queue_action_data(transferee_bridge_channel,
3051  BRIDGE_CHANNEL_ACTION_ATTENDED_TRANSFER, unbridged_chan_name,
3052  sizeof(unbridged_chan_name));
3053 }
3054 
3055 int bridge_channel_internal_allows_optimization(struct ast_bridge_channel *bridge_channel)
3056 {
3057  return bridge_channel->in_bridge
3058  && AST_LIST_EMPTY(&bridge_channel->wr_queue);
3059 }
3060 
3061 /* Destroy elements of the bridge channel structure and the bridge channel structure itself */
3062 static void bridge_channel_destroy(void *obj)
3063 {
3064  struct ast_bridge_channel *bridge_channel = obj;
3065  struct ast_frame *fr;
3066 
3067  if (bridge_channel->callid) {
3068  bridge_channel->callid = 0;
3069  }
3070 
3071  if (bridge_channel->bridge) {
3072  ao2_ref(bridge_channel->bridge, -1);
3073  bridge_channel->bridge = NULL;
3074  }
3075 
3076  /* Flush any unhandled wr_queue frames. */
3077  while ((fr = AST_LIST_REMOVE_HEAD(&bridge_channel->wr_queue, frame_list))) {
3078  bridge_frame_free(fr);
3079  }
3080  ast_alertpipe_close(bridge_channel->alert_pipe);
3081 
3082  /* Flush any unhandled deferred_queue frames. */
3083  while ((fr = AST_LIST_REMOVE_HEAD(&bridge_channel->deferred_queue, frame_list))) {
3084  ast_frfree(fr);
3085  }
3086 
3087  ast_cond_destroy(&bridge_channel->cond);
3088 
3089  ao2_cleanup(bridge_channel->write_format);
3090  ao2_cleanup(bridge_channel->read_format);
3091 
3092  AST_VECTOR_FREE(&bridge_channel->stream_map.to_bridge);
3093  AST_VECTOR_FREE(&bridge_channel->stream_map.to_channel);
3094 }
3095 
3096 struct ast_bridge_channel *bridge_channel_internal_alloc(struct ast_bridge *bridge)
3097 {
3098  struct ast_bridge_channel *bridge_channel;
3099 
3100  bridge_channel = ao2_alloc(sizeof(struct ast_bridge_channel), bridge_channel_destroy);
3101  if (!bridge_channel) {
3102  return NULL;
3103  }
3104  ast_cond_init(&bridge_channel->cond, NULL);
3105  if (ast_alertpipe_init(bridge_channel->alert_pipe)) {
3106  ao2_ref(bridge_channel, -1);
3107  return NULL;
3108  }
3109  if (bridge) {
3110  bridge_channel->bridge = bridge;
3111  ao2_ref(bridge_channel->bridge, +1);
3112  }
3113 
3114  /* The stream_map is initialized later - see ast_bridge_channel_stream_map */
3115 
3116  return bridge_channel;
3117 }
3118 
3120 {
3121  ast_bridge_channel_lock(bridge_channel);
3122  ast_channel_lock(bridge_channel->chan);
3124  &bridge_channel->bridge->media_types, &bridge_channel->stream_map.to_bridge,
3125  &bridge_channel->stream_map.to_channel);
3126  ast_channel_unlock(bridge_channel->chan);
3127  ast_bridge_channel_unlock(bridge_channel);
3128 }
struct stasis_message_type * ast_channel_hold_type(void)
Message type for when a channel is placed on hold.
ast_bridge_custom_play_fn custom_play
#define AST_VECTOR_FREE(vec)
Deallocates this vector.
Definition: vector.h:174
int ast_dtmf_stream(struct ast_channel *chan, struct ast_channel *peer, const char *digits, int between, unsigned int duration)
Send a string of DTMF digits to a channel.
Definition: main/app.c:1127
#define PLAYBACK_TIMEOUT
Failsafe for synchronous bridge action waiting.
void ast_party_connected_line_init(struct ast_party_connected_line *init)
Initialize the given connected line structure.
Definition: channel.c:2022
Main Channel structure associated with a channel.
Local proxy channel special access.
Music on hold handling.
enum bridge_channel_thread_state activity
The bridge channel thread activity.
struct ast_bridge_channel::@193 dtmf_hook_state
int ast_connected_line_build_data(unsigned char *data, size_t datalen, const struct ast_party_connected_line *connected, const struct ast_set_party_connected_line *update)
Build the connected line information data frame.
Definition: channel.c:8697
#define ast_frdup(fr)
Copies a frame.
int ast_bridge_queue_everyone_else(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
Queue the given frame to everyone else.
struct ast_sem sem
Feature configuration relating to transfers.
void ast_bridge_channel_clear_roles(struct ast_bridge_channel *bridge_channel)
Clear all roles from a bridge_channel's role list.
Definition: bridge_roles.c:491
int ast_sem_destroy(struct ast_sem *sem)
Destroy a semaphore.
Asterisk main include file. File version handling, generic pbx functions.
struct ast_flags feature_flags
Definition: bridge.h:369
#define AST_LIST_FIRST(head)
Returns the first entry contained in a list.
Definition: linkedlists.h:421
const ast_string_field uniqueid
Definition: bridge.h:401
struct ast_bridge_features * features
const char * ast_bridge_after_cb_reason_string(enum ast_bridge_after_cb_reason reason)
Get a string representation of an after bridge callback reason.
Definition: bridge_after.c:288
int(* ast_bridge_talking_indicate_callback)(struct ast_bridge_channel *bridge_channel, void *hook_pvt, int talking)
Talking indicator callback.
struct stasis_message_type * ast_channel_unhold_type(void)
Message type for when a channel is removed from hold.
unsigned int num_active
Definition: bridge.h:375
int ast_channel_is_multistream(struct ast_channel *chan)
Determine if a channel is multi-stream capable.
struct ast_json * ast_json_pack(char const *format,...)
Helper for creating complex JSON values.
Definition: json.c:612
int(* ast_bridge_channel_post_action_data)(struct ast_bridge_channel *bridge_channel, enum bridge_channel_action_type action, const void *data, size_t datalen)
Used to queue an action frame onto a bridge channel and write an action frame into a bridge...
unsigned int option_dtmfminduration
Definition: options.c:83
struct ast_stream_topology * ast_channel_get_stream_topology(const struct ast_channel *chan)
Retrieve the topology of streams on a channel.
bridge_channel_state
State information about a bridged channel.
void ast_bridge_vars_set(struct ast_channel *chan, const char *name, const char *pvtid)
Sets BRIDGECHANNEL and BRIDGEPVTCALLID for a channel.
Definition: bridge.c:1212
Call Parking API.
void ast_party_id_reset(struct ast_party_id *id)
Destroy and initialize the given party id structure.
Definition: channel.c:1896
Structure that contains features information.
#define ast_channel_unref(c)
Decrease channel reference count.
Definition: channel.h:2958
int ast_indicate(struct ast_channel *chan, int condition)
Indicates condition of channel.
Definition: channel.c:4277
void(* suspend)(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
Suspend a channel on a bridging technology instance for a bridge.
void ast_json_unref(struct ast_json *value)
Decrease refcount on value. If refcount reaches zero, value is freed.
Definition: json.c:73
void ast_channel_publish_cached_blob(struct ast_channel *chan, struct stasis_message_type *type, struct ast_json *blob)
Publish a channel blob message using the latest snapshot from the cache.
void ast_channel_publish_dial(struct ast_channel *caller, struct ast_channel *peer, const char *dialstring, const char *dialstatus)
Publish in the ast_channel_topic or ast_channel_topic_all topics a stasis message for the channels in...
void ast_bridge_publish_leave(struct ast_bridge *bridge, struct ast_channel *chan)
Publish a bridge channel leave event.
void ast_bridge_publish_enter(struct ast_bridge *bridge, struct ast_channel *chan, struct ast_channel *swap)
Publish a bridge channel enter event.
const char * name
Definition: bridge.h:259
void ast_bridge_channel_leave_bridge(struct ast_bridge_channel *bridge_channel, enum bridge_channel_state new_state, int cause)
Set bridge channel state to leave bridge (if not leaving already).
Configuration for the builtin features.
int ast_sem_post(struct ast_sem *sem)
Increments the semaphore, unblocking a waiter if necessary.
int ast_softhangup(struct ast_channel *chan, int cause)
Softly hangup up a channel.
Definition: channel.c:2471
int(* stream_topology_request_change)(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
Callback for when a request has been made to change a stream topology on a channel.
ast_callid callid
Definition: bridge.h:361
unsigned int dissolved
Definition: bridge.h:390
unsigned int id
unsigned int reconfigured
Definition: bridge.h:388
#define AST_RWLIST_RDLOCK(head)
Read locks a list.
Definition: linkedlists.h:78
int ast_sem_timedwait(struct ast_sem *sem, const struct timespec *abs_timeout)
Decrements the semaphore, waiting until abs_timeout.
void ast_bridge_channel_restore_formats(struct ast_bridge_channel *bridge_channel)
Restore the formats of a bridge channel's channel to how they were before bridge_channel_internal_joi...
enum bridge_channel_state state
unsigned int suspended
struct ast_bridge_hook generic
static void bridge_sync_wait(struct bridge_sync *sync_struct)
Wait for a synchronous bridge action to complete.
void ast_channel_clear_flag(struct ast_channel *chan, unsigned int flag)
Clear a flag on a channel.
Definition: channel.c:11034
static void bridge_sync_init(struct bridge_sync *sync_struct, unsigned int id)
Initialize a synchronous bridge object.
Test Framework API.
void ast_alertpipe_close(int alert_pipe[2])
Close an alert pipe.
Definition: alertpipe.c:79
struct ast_channel * ast_bridge_channel_get_chan(struct ast_bridge_channel *bridge_channel)
Get a ref to the bridge_channel's ast_channel.
Definition: heap.c:36
enum ast_control_t38 request_response
int ast_bridge_channel_write_app(struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
Write a bridge action run application frame into the bridge.
struct ast_frame * ast_read_stream(struct ast_channel *chan)
Reads a frame, but does not filter to just the default streams.
Definition: channel.c:4262
#define AST_RWLIST_WRLOCK(head)
Write locks a list.
Definition: linkedlists.h:52
Structure used to transport a message through the frame core.
ast_channel_state
ast_channel states
Definition: channelstate.h:35
int ast_indicate_data(struct ast_channel *chan, int condition, const void *data, size_t datalen)
Indicates condition of channel, with payload.
Definition: channel.c:4653
void(* stream_topology_changed)(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
Callback for when a stream topology changes on the channel.
void(* ast_bridge_custom_callback_fn)(struct ast_bridge_channel *bridge_channel, const void *payload, size_t payload_size)
Custom callback run on a bridge channel.
struct ao2_container * dtmf_hooks
void ao2_iterator_destroy(struct ao2_iterator *iter)
Destroy a container iterator.
void ast_bridge_channel_feature_digit(struct ast_bridge_channel *bridge_channel, int digit)
Add a DTMF digit to the collected digits to match against DTMF features.
ast_control_frame_type
Internal control frame subtype field values.
General features configuration items.
struct timeval ast_tvnow(void)
Returns current timeval. Meant to replace calls to gettimeofday().
Definition: time.h:159
int ast_bridge_channel_queue_frame(struct ast_bridge_channel *bridge_channel, struct ast_frame *fr)
Write a frame to the specified bridge_channel.
ast_callid ast_read_threadstorage_callid(void)
extracts the callerid from the thread
Definition: logger.c:2298
#define AST_LIST_EMPTY(head)
Checks whether the specified list contains any entries.
Definition: linkedlists.h:450
struct ast_bridge_channel * ast_bridge_channel_peer(struct ast_bridge_channel *bridge_channel)
Get the peer bridge channel of a two party bridge.
const char * ast_format_get_name(const struct ast_format *format)
Get the name associated with a format.
Definition: format.c:334
int64_t ast_tvdiff_ms(struct timeval end, struct timeval start)
Computes the difference (in milliseconds) between two struct timeval instances.
Definition: time.h:107
struct ast_channel * ast_waitfor_nandfds(struct ast_channel **c, int n, int *fds, int nfds, int *exception, int *outfd, int *ms)
Waits for activity on a group of channels.
Definition: channel.c:2988
int ast_sendtext_data(struct ast_channel *chan, struct ast_msg_data *msg)
Sends text to a channel in an ast_msg_data structure wrapper with ast_sendtext as fallback...
Definition: channel.c:4751
#define AST_OPTION_TDD
void ast_party_connected_line_free(struct ast_party_connected_line *doomed)
Destroy the connected line information contents.
Definition: channel.c:2072
int ast_bridge_channel_queue_app(struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
Queue a bridge action run application frame onto the bridge channel.
int ast_channel_move(struct ast_channel *dest, struct ast_channel *source)
Move a channel from its current location to a new location.
Definition: channel.c:10666
Out-of-call text message support.
int ast_bridge_channel_establish_roles(struct ast_bridge_channel *bridge_channel)
Clone the roles from a bridge_channel's attached ast_channel onto the bridge_channel's role list...
Definition: bridge_roles.c:443
#define AST_LIST_REMOVE(head, elm, field)
Removes a specific entry from a list.
Definition: linkedlists.h:856
char collected[MAXIMUM_DTMF_FEATURE_STRING]
int ast_channel_setoption(struct ast_channel *channel, int option, void *data, int datalen, int block)
Sets an option on a channel.
Definition: channel.c:7422
int ast_bridge_channel_queue_playfile(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
Queue a bridge action play file frame onto the bridge channel.
int ast_bridge_channel_write_control_data(struct ast_bridge_channel *bridge_channel, enum ast_control_frame_type control, const void *data, size_t datalen)
Write a control frame into the bridge with data.
int ast_bridge_channel_write_callback(struct ast_bridge_channel *bridge_channel, enum ast_bridge_channel_custom_callback_option flags, ast_bridge_custom_callback_fn callback, const void *payload, size_t payload_size)
Write a bridge action custom callback frame into the bridge.
#define AST_LIST_TRAVERSE_SAFE_END
Closes a safe loop traversal block.
Definition: linkedlists.h:615
ast_bridge_custom_callback_fn callback
int ast_bridge_set_after_callback(struct ast_channel *chan, ast_bridge_after_cb callback, ast_bridge_after_cb_failed failed, void *data)
Setup an after bridge callback for when the channel leaves the bridging system.
Definition: bridge_after.c:251
void ast_bridge_channel_stream_map(struct ast_bridge_channel *bridge_channel)
Maps a channel's stream topology to and from the bridge.
int ast_write_stream(struct ast_channel *chan, int stream_num, struct ast_frame *frame)
Write a frame to a stream This function writes the given frame to the indicated stream on the channel...
Definition: channel.c:5149
int ast_bridge_channel_queue_callback(struct ast_bridge_channel *bridge_channel, enum ast_bridge_channel_custom_callback_option flags, ast_bridge_custom_callback_fn callback, const void *payload, size_t payload_size)
Queue a bridge action custom callback frame onto the bridge channel.
int ast_atomic_fetchadd_int(volatile int *p, int v)
Atomically add v to *p and return the previous value of *p.
Definition: lock.h:757
struct timeval dtmf_tv
struct ast_vector_int to_bridge
struct ast_bridge * bridge
Bridge this channel is participating in.
struct ast_frame_subclass subclass
Media Stream API.
Frame payload for synchronous bridge actions.
struct ast_channel * ast_local_get_peer(struct ast_channel *ast)
Get the other local channel in the pair.
Definition: core_local.c:276
Asterisk semaphore API.
ast_bridge_after_cb_reason
Definition: bridge_after.h:37
#define AST_RWLIST_HEAD_STATIC(name, type)
Defines a structure to be used to hold a read/write list of specified type, statically initialized...
Definition: linkedlists.h:333
#define ao2_bump(obj)
Bump refcount on an AO2 object by one, returning the object.
Definition: astobj2.h:480
Data specifying where a blind transfer is going to.
void * ao2_object_get_lockaddr(void *obj)
Return the mutex lock address of an object.
Definition: astobj2.c:476
struct ast_bridge_technology * technology
Definition: bridge.h:355
struct ast_flags feature_flags
unsigned int text_messaging
void ast_bridge_remove_video_src(struct ast_bridge *bridge, struct ast_channel *chan)
remove a channel as a source of video for the bridge.
Definition: bridge.c:3917
int ast_bridge_channel_write_unhold(struct ast_bridge_channel *bridge_channel)
Write an unhold frame into the bridge.
Max Heap data structure.
int ast_bridge_channel_notify_talking(struct ast_bridge_channel *bridge_channel, int started_talking)
Lets the bridging indicate when a bridge channel has stopped or started talking.
void(* leave)(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
Remove a channel from a bridging technology instance for a bridge.
The arg parameter is a partial search key similar to OBJ_SEARCH_KEY.
Definition: astobj2.h:1116
#define ast_heap_push(h, elm)
Push an element on to a heap.
Definition: heap.h:125
enum ast_format_cmp_res ast_format_cmp(const struct ast_format *format1, const struct ast_format *format2)
Compare two formats.
Definition: format.c:201
#define ast_bridge_channel_lock(bridge_channel)
Lock the bridge_channel.
void ast_bridge_channel_leave_bridge_nolock(struct ast_bridge_channel *bridge_channel, enum bridge_channel_state new_state, int cause)
Set bridge channel state to leave bridge (if not leaving already).
void ast_channel_queue_connected_line_update(struct ast_channel *chan, const struct ast_party_connected_line *connected, const struct ast_set_party_connected_line *update)
Queue a connected line update frame on a channel.
Definition: channel.c:9106
enum ast_bridge_hook_type type
General Asterisk PBX channel definitions.
ast_bridge_hook_type
struct bridge_sync::@318 list
void ast_jb_enable_for_channel(struct ast_channel *chan)
Sets a jitterbuffer frame hook on the channel based on the channel's stored jitterbuffer configuratio...
Definition: abstract_jb.c:585
void ast_bridge_channel_kick(struct ast_bridge_channel *bridge_channel, int cause)
Kick the channel out of the bridge.
int ast_set_read_format(struct ast_channel *chan, struct ast_format *format)
Sets read format on channel chan.
Definition: channel.c:5762
#define AST_OPTION_RELAXDTMF
void ast_channel_internal_bridge_set(struct ast_channel *chan, struct ast_bridge *value)
int(* write)(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, struct ast_frame *frame)
Write a frame into the bridging technology instance for a bridge.
#define ast_strdupa(s)
duplicate a string in memory from the stack
Definition: astmm.h:298
ast_alert_status_t ast_alertpipe_read(int alert_pipe[2])
Read an event from an alert pipe.
Definition: alertpipe.c:102
void(* ast_bridge_custom_play_fn)(struct ast_bridge_channel *bridge_channel, const char *playfile)
Custom interpretation of the playfile name.
#define ao2_ref(o, delta)
Reference/unreference an object and return the old refcount.
Definition: astobj2.h:459
#define AST_MAX_EXTENSION
Definition: channel.h:134
int ast_channel_redirecting_sub(struct ast_channel *autoservice_chan, struct ast_channel *sub_chan, const void *redirecting_info, int is_frame)
Run a redirecting interception subroutine and update a channel's redirecting information.
Definition: channel.c:10383
#define AST_LIST_REMOVE_CURRENT(field)
Removes the current entry from a list during a traversal.
Definition: linkedlists.h:557
struct timeval ast_samp2tv(unsigned int _nsamp, unsigned int _rate)
Returns a timeval corresponding to the duration of n samples at rate r. Useful to convert samples to ...
Definition: time.h:282
Private Bridging Channel API.
struct ast_frame * ast_read_stream_noaudio(struct ast_channel *chan)
Reads a frame, but does not filter to just the default streams, returning AST_FRAME_NULL frame if aud...
Definition: channel.c:4272
struct ast_bridge_hook_dtmf_parms dtmf
void ast_bridge_channel_run_app(struct ast_bridge_channel *bridge_channel, const char *app_name, const char *app_args, const char *moh_class)
Run an application on the bridge channel.
#define ast_debug(level,...)
Log a DEBUG message.
int ast_set_write_format(struct ast_channel *chan, struct ast_format *format)
Sets write format on channel chan.
Definition: channel.c:5803
struct timeval interdigit_timeout
#define AST_LIST_REMOVE_HEAD(head, field)
Removes and returns the head entry from a list.
Definition: linkedlists.h:833
int ast_channel_is_t38_active(struct ast_channel *chan)
This function will check if T.38 is active on the channel.
unsigned int just_joined
static int sync_ids
Counter used for assigning synchronous bridge action IDs.
Core PBX routines and definitions.
int ast_queue_frame(struct ast_channel *chan, struct ast_frame *f)
Queue one or more frames to a channel's frame queue.
Definition: channel.c:1139
int ast_channel_is_leaving_bridge(struct ast_channel *chan)
Determine if a channel is leaving a bridge, but not hung up.
Definition: channel.c:10550
struct ast_heap * interval_hooks
struct ast_bridge_channel::@190 wr_queue
void ast_bridge_channel_feature_digit_add(struct ast_bridge_channel *bridge_channel, int digit)
Add a DTMF digit to the collected digits.
struct ast_format * write_format
int ast_alertpipe_init(int alert_pipe[2])
Initialize an alert pipe.
Definition: alertpipe.c:38
#define ast_test_suite_event_notify(s, f,...)
Definition: test.h:189
#define ast_alloca(size)
call __builtin_alloca to ensure we get gcc builtin semantics
Definition: astmm.h:288
ast_frame_type
Frame types.
void ast_bridge_features_merge(struct ast_bridge_features *into, const struct ast_bridge_features *from)
Merge one ast_bridge_features into another.
Definition: bridge.c:3595
#define ast_bridge_channel_unlock(bridge_channel)
Unlock the bridge_channel.
const struct ast_bridge_methods * v_table
Definition: bridge.h:351
unsigned int dtmf_passthrough
struct ast_vector_int to_channel
#define AST_OPTION_DIGIT_DETECT
Structure that contains information about a bridge.
Definition: bridge.h:349
int ast_pbx_exec_application(struct ast_channel *chan, const char *app_name, const char *app_args)
Execute an application.
Definition: pbx_app.c:501
#define AST_LIST_INSERT_TAIL(head, elm, field)
Appends a list entry to the tail of a list.
Definition: linkedlists.h:731
unsigned int num_lonely
Definition: bridge.h:377
#define ao2_unlink(container, obj)
Remove an object from a container.
Definition: astobj2.h:1578
List holding active synchronous action objects.
int ast_channel_connected_line_sub(struct ast_channel *autoservice_chan, struct ast_channel *sub_chan, const void *connected_info, int frame)
Run a connected line interception subroutine and update a channel's connected line information...
Definition: channel.c:10338
#define AST_DIGIT_NONE
Definition: file.h:47
ast_bridge_hook_callback callback
const char * ast_msg_data_get_attribute(struct ast_msg_data *msg, enum ast_msg_data_attribute_type attribute_type)
Get attribute from ast_msg_data.
struct timeval ast_tvadd(struct timeval a, struct timeval b)
Returns the sum of two timevals a + b.
Definition: extconf.c:2282
Connected Line/Party information.
Definition: channel.h:456
int ast_moh_start(struct ast_channel *chan, const char *mclass, const char *interpclass)
Turn on music on hold on a given channel.
Definition: channel.c:7766
#define ast_strndup(str, len)
A wrapper for strndup()
Definition: astmm.h:256
struct ast_bridge_channel::@191 deferred_queue
const char * app_name(struct ast_app *app)
Definition: pbx_app.c:463
#define AST_LIST_LAST(head)
Returns the last entry contained in a list.
Definition: linkedlists.h:429
struct ast_format * read_format
void ast_channel_publish_dial_forward(struct ast_channel *caller, struct ast_channel *peer, struct ast_channel *forwarded, const char *dialstring, const char *dialstatus, const char *forward)
Publish in the ast_channel_topic or ast_channel_topic_all topics a stasis message for the channels in...
int ast_bridge_channel_write_playfile(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
Write a bridge action play file frame into the bridge.
#define AST_LIST_TRAVERSE(head, var, field)
Loops over (traverses) the entries in a list.
Definition: linkedlists.h:491
#define AST_LIST_ENTRY(type)
Declare a forward link structure inside a list entry.
Definition: linkedlists.h:410
#define AST_LIST_INSERT_HEAD(head, elm, field)
Inserts a list entry at the head of a list.
Definition: linkedlists.h:711
unsigned int in_bridge
struct ast_bridge_features * ast_channel_feature_hooks_get(struct ast_channel *chan)
Gets the channel-attached features a channel has access to upon being bridged.
Definition: channel.c:10903
int ast_parking_provider_registered(void)
Check whether a parking provider is registered.
Definition: parking.c:241
#define ast_bridge_unlock(bridge)
Unlock the bridge.
Definition: bridge.h:481
#define AST_MAX_CONTEXT
Definition: channel.h:135
union ast_frame::@224 data
unsigned int inhibit_colp
#define AST_CHANNEL_NAME
Definition: channel.h:171
int ast_stream_and_wait(struct ast_channel *chan, const char *file, const char *digits)
stream file until digit If the file name is non-empty, try to play it.
Definition: file.c:1878
#define AST_OPTION_AUDIO_MODE
struct ast_bridge_hook_timer_parms timer
int ast_sem_init(struct ast_sem *sem, int pshared, unsigned int value)
Initialize a semaphore.
int ast_bridge_channel_write_park(struct ast_bridge_channel *bridge_channel, const char *parkee_uuid, const char *parker_uuid, const char *app_data)
Have a bridge channel park a channel in the bridge.
int ast_parking_park_bridge_channel(struct ast_bridge_channel *parkee, const char *parkee_uuid, const char *parker_uuid, const char *app_data)
Perform a direct park on a channel in a bridge.
Definition: parking.c:126
void ast_channel_end_dtmf(struct ast_channel *chan, char digit, struct timeval start, const char *why)
Simulate a DTMF end on a broken bridge channel.
Definition: channel.c:10869
struct ast_channel * swap
void ast_bridge_features_remove(struct ast_bridge_features *features, enum ast_bridge_hook_remove_flags flags)
Remove marked bridge channel feature hooks.
Definition: bridge.c:3501
struct ast_bridge * ast_bridge_channel_merge_inhibit(struct ast_bridge_channel *bridge_channel, int request)
Adjust the bridge_channel's bridge merge inhibit request count.
struct ast_bridge_hook generic
int cause
Definition: bridge.h:386
struct ast_bridge_channel * ast_channel_get_bridge_channel(struct ast_channel *chan)
Get a reference to the channel's bridge pointer.
Definition: channel.c:10582
int pbx_builtin_setvar_helper(struct ast_channel *chan, const char *name, const char *value)
Add a variable to the channel variable stack, removing the most recently set value for the same name...
#define ast_bridge_lock(bridge)
Lock the bridge.
Definition: bridge.h:470
struct ast_frame ast_null_frame
Definition: main/frame.c:79
void ast_channel_internal_copy_linkedid(struct ast_channel *dest, struct ast_channel *source)
Copy the full linkedid channel id structure from one channel to another.
#define ast_channel_lock_both(chan1, chan2)
Lock two channels.
Definition: channel.h:2929
struct ast_bridge_channels_list channels
Definition: bridge.h:363
#define AST_VECTOR_GET(vec, idx)
Get an element from a vector.
Definition: vector.h:680
struct ast_channel * chan
void * ast_heap_remove(struct ast_heap *h, void *elm)
Remove a specific element from a heap.
Definition: heap.c:251
Structure that contains information regarding a channel in a bridge.
void ast_party_connected_line_copy(struct ast_party_connected_line *dest, const struct ast_party_connected_line *src)
Copy the source connected line information to the destination connected line.
Definition: channel.c:2031
#define AST_OPTION_FAX_DETECT
ssize_t ast_alertpipe_write(int alert_pipe[2])
Write an event to an alert pipe.
Definition: alertpipe.c:120
After Bridge Execution API.
#define ast_channel_ref(c)
Increase channel reference count.
Definition: channel.h:2947
Definition: sem.h:81
When we need to walk through a container, we use an ao2_iterator to keep track of the current positio...
Definition: astobj2.h:1821
void ast_copy_string(char *dst, const char *src, size_t size)
Size-limited null-terminating string copy.
Definition: strings.h:425
bridge_channel_action_type
void ast_connected_line_copy_from_caller(struct ast_party_connected_line *dest, const struct ast_party_caller *src)
Copy the caller information to the connected line information.
Definition: channel.c:8293
#define S_OR(a, b)
returns the equivalent of logic or for strings: first one if not empty, otherwise second one...
Definition: strings.h:80
struct ao2_container * other_hooks
int ast_bridge_channel_write_hold(struct ast_bridge_channel *bridge_channel, const char *moh_class)
Write a hold frame into the bridge.
int ast_async_goto(struct ast_channel *chan, const char *context, const char *exten, int priority)
Set the channel to next execute the specified dialplan location.
Definition: pbx.c:6969
int ast_answer(struct ast_channel *chan)
Answer a channel.
Definition: channel.c:2805
int ast_queue_control_data(struct ast_channel *chan, enum ast_control_frame_type control, const void *data, size_t datalen)
Queue a control frame with payload.
Definition: channel.c:1238
struct ast_vector_int media_types
Definition: bridge.h:404
int ast_is_deferrable_frame(const struct ast_frame *frame)
Should we keep this frame for later?
Definition: channel.c:1467
int ast_bridge_channel_queue_playfile_sync(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
Synchronously queue a bridge action play file frame onto the bridge channel.
void * ast_heap_peek(struct ast_heap *h, unsigned int index)
Peek at an element on a heap.
Definition: heap.c:267
Data structure associated with a single frame of data.
int ast_app_exec_sub(struct ast_channel *autoservice_chan, struct ast_channel *sub_chan, const char *sub_args, int ignore_hangup)
Run a subroutine on a channel, placing an optional second channel into autoservice.
Definition: main/app.c:297
Internal Asterisk hangup causes.
Abstract JSON element (object, array, string, int, ...).
static void bridge_sync_cleanup(struct bridge_sync *sync_struct)
Clean up a synchronization bridge object.
int ast_channel_unbridged(struct ast_channel *chan)
This function will check if the bridge needs to be re-evaluated due to external changes.
#define AST_OPTION_TONE_VERIFY
Synchronous bridge action object.
void ast_bridge_channel_playfile(struct ast_bridge_channel *bridge_channel, ast_bridge_custom_play_fn custom_play, const char *playfile, const char *moh_class)
Play a file on the bridge channel.
Definition: search.h:40
void(* transfer_channel_cb)(struct ast_channel *chan, struct transfer_channel_data *user_data, enum ast_transfer_type transfer_type)
Callback function type called during blind transfers.
Definition: bridge.h:1143
ast_bridge_pull_channel_fn pull
Definition: bridge.h:267
ast_bridge_push_channel_fn push
Definition: bridge.h:265
unsigned int interval_sequence
#define AST_RWLIST_UNLOCK(head)
Attempts to unlock a read/write based list.
Definition: linkedlists.h:151
#define AST_LIST_TRAVERSE_SAFE_BEGIN(head, var, field)
Loops safely over (traverses) the entries in a list.
Definition: linkedlists.h:529
void ast_stream_topology_map(const struct ast_stream_topology *topology, struct ast_vector_int *types, struct ast_vector_int *v0, struct ast_vector_int *v1)
Map a given topology's streams to the given types.
Definition: stream.c:985
enum ast_frame_type frametype
Private Bridging API.
static void bridge_sync_signal(struct bridge_sync *sync_struct)
Signal that waiting for a synchronous bridge action is no longer necessary.
int ast_queue_frame_head(struct ast_channel *chan, struct ast_frame *f)
Queue one or more frames to the head of a channel's frame queue.
Definition: channel.c:1144
void(* unsuspend)(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel)
Unsuspend a channel on a bridging technology instance for a bridge.
int ast_bridge_channel_queue_control_data(struct ast_bridge_channel *bridge_channel, enum ast_control_frame_type control, const void *data, size_t datalen)
Queue a control frame onto the bridge channel with data.
struct ast_channel * ast_channel_get_by_name(const char *name)
Find a channel by name.
Definition: channel.c:1454
Bridging API.
ast_bridge_channel_custom_callback_option
struct ast_bridge_channel::@192 owed
#define RAII_VAR(vartype, varname, initval, dtor)
Declare a variable that will call a destructor function when it goes out of scope.
Definition: utils.h:941
void ast_bridge_channel_lock_bridge(struct ast_bridge_channel *bridge_channel)
Lock the bridge associated with the bridge channel.
Application convenience functions, designed to give consistent look and feel to Asterisk apps...
char code[MAXIMUM_DTMF_FEATURE_STRING]
struct ao2_iterator ao2_iterator_init(struct ao2_container *c, int flags) attribute_warn_unused_result
Create an iterator for a container.
Structure that is the essence of a feature hook.
unsigned int num_channels
Definition: bridge.h:373
#define AST_VECTOR_SIZE(vec)
Get the number of elements in a vector.
Definition: vector.h:609
Timing source management.
unsigned char data[0]
unsigned int id
void ast_channel_set_unbridged(struct ast_channel *chan, int value)
Sets the unbridged flag and queues a NULL frame on the channel to trigger a check by bridge_channel_w...
struct ast_channel * ast_channel_internal_oldest_linkedid(struct ast_channel *a, struct ast_channel *b)
Determine which channel has an older linkedid.
int ast_sendtext(struct ast_channel *chan, const char *text)
Sends text to a channel.
Definition: channel.c:4809