apps/app_confbridge.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2007-2008, 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 Conference Bridge application
  22  *
  23  * \author\verbatim Joshua Colp <jcolp@digium.com> \endverbatim
  24  *
  25  * This is a conference bridge application utilizing the bridging core.
  26  * \ingroup applications
  27  */
  28
  29 #include "asterisk.h"
  30
  31 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36 #include <string.h>
  37 #include <signal.h>
  38
  39 #include "asterisk/file.h"
  40 #include "asterisk/logger.h"
  41 #include "asterisk/channel.h"
  42 #include "asterisk/pbx.h"
  43 #include "asterisk/module.h"
  44 #include "asterisk/lock.h"
  45 #include "asterisk/app.h"
  46 #include "asterisk/bridging.h"
  47 #include "asterisk/musiconhold.h"
  48 #include "asterisk/say.h"
  49 #include "asterisk/audiohook.h"
  50 #include "asterisk/astobj2.h"
  51
  52 /*** DOCUMENTATION
  53         <application name="ConfBridge" language="en_US">
  54                 <synopsis>
  55                         Conference bridge application.
  56                 </synopsis>
  57                 <syntax>
  58                         <parameter name="confno">
  59                                 <para>The conference number</para>
  60                         </parameter>
  61                         <parameter name="options">
  62                                 <optionlist>
  63                                         <option name="a">
  64                                                 <para>Set admin mode.</para>
  65                                         </option>
  66                                         <option name="A">
  67                                                 <para>Set marked mode.</para>
  68                                         </option>
  69                                         <option name="c">
  70                                                 <para>Announce user(s) count on joining a conference.</para>
  71                                         </option>
  72                                         <option name="m">
  73                                                 <para>Set initially muted.</para>
  74                                         </option>
  75                                         <option name="M" hasparams="optional">
  76                                                 <para>Enable music on hold when the conference has a single caller. Optionally,
  77                                                 specify a musiconhold class to use. If one is not provided, it will use the
  78                                                 channel's currently set music class, or <literal>default</literal>.</para>
  79                                                 <argument name="class" required="true" />
  80                                         </option>
  81                                         <option name="1">
  82                                                 <para>Do not play message when first person enters</para>
  83                                         </option>
  84                                         <option name="s">
  85                                                 <para>Present menu (user or admin) when <literal>*</literal> is received
  86                                                 (send to menu).</para>
  87                                         </option>
  88                                         <option name="w">
  89                                                 <para>Wait until the marked user enters the conference.</para>
  90                                         </option>
  91                                         <option name="q">
  92                                                 <para>Quiet mode (don't play enter/leave sounds).</para>
  93                                         </option>
  94                                 </optionlist>
  95                       </parameter>
  96                 </syntax>
  97                 <description>
  98                         <para>Enters the user into a specified conference bridge. The user can exit the conference by hangup only.</para>
  99                         <para>The join sound can be set using the <literal>CONFBRIDGE_JOIN_SOUND</literal> variable and the leave sound can be set using the <literal>CONFBRIDGE_LEAVE_SOUND</literal> variable. These can be unique to the caller.</para>
 100                 </description>
 101         </application>
 102 ***/
 103
 104 /*!
 105  * \par Playing back a file to a channel in a conference
 106  * You might notice in this application that while playing a sound file
 107  * to a channel the actual conference bridge lock is not held. This is done so
 108  * that other channels are not blocked from interacting with the conference bridge.
 109  * Unfortunately because of this it is possible for things to change after the sound file
 110  * is done being played. Data must therefore be checked after reacquiring the conference
 111  * bridge lock if it is important.
 112  */
 113
 114 static const char *app = "ConfBridge";
 115
 116 enum {
 117         OPTION_ADMIN = (1 << 0),             /*!< Set if the caller is an administrator */
 118         OPTION_MENU = (1 << 1),              /*!< Set if the caller should have access to the conference bridge IVR menu */
 119         OPTION_MUSICONHOLD = (1 << 2),       /*!< Set if music on hold should be played if nobody else is in the conference bridge */
 120         OPTION_NOONLYPERSON = (1 << 3),      /*!< Set if the "you are currently the only person in this conference" sound file should not be played */
 121         OPTION_STARTMUTED = (1 << 4),        /*!< Set if the caller should be initially set muted */
 122         OPTION_ANNOUNCEUSERCOUNT = (1 << 5), /*!< Set if the number of users should be announced to the caller */
 123         OPTION_MARKEDUSER = (1 << 6),        /*!< Set if the caller is a marked user */
 124         OPTION_WAITMARKED = (1 << 7),        /*!< Set if the conference must wait for a marked user before starting */
 125         OPTION_QUIET = (1 << 8),             /*!< Set if no audio prompts should be played */
 126 };
 127
 128 enum {
 129         OPTION_MUSICONHOLD_CLASS,            /*!< If the 'M' option is set, the music on hold class to play */
 130         /*This must be the last element */
 131         OPTION_ARRAY_SIZE,
 132 };
 133
 134 AST_APP_OPTIONS(app_opts,{
 135         AST_APP_OPTION('A', OPTION_MARKEDUSER),
 136         AST_APP_OPTION('a', OPTION_ADMIN),
 137         AST_APP_OPTION('c', OPTION_ANNOUNCEUSERCOUNT),
 138         AST_APP_OPTION('m', OPTION_MENU),
 139         AST_APP_OPTION_ARG('M', OPTION_MUSICONHOLD, OPTION_MUSICONHOLD_CLASS),
 140         AST_APP_OPTION('1', OPTION_NOONLYPERSON),
 141         AST_APP_OPTION('s', OPTION_STARTMUTED),
 142         AST_APP_OPTION('w', OPTION_WAITMARKED),
 143         AST_APP_OPTION('q', OPTION_QUIET),
 144 });
 145
 146 /* Maximum length of a conference bridge name */
 147 #define MAX_CONF_NAME 32
 148
 149 /* Number of buckets our conference bridges container can have */
 150 #define CONFERENCE_BRIDGE_BUCKETS 53
 151
 152 /*! \brief The structure that represents a conference bridge */
 153 struct conference_bridge {
 154         char name[MAX_CONF_NAME];                                         /*!< Name of the conference bridge */
 155         struct ast_bridge *bridge;                                        /*!< Bridge structure doing the mixing */
 156         unsigned int users;                                               /*!< Number of users present */
 157         unsigned int markedusers;                                         /*!< Number of marked users present */
 158         unsigned int locked:1;                                            /*!< Is this conference bridge locked? */
 159         AST_LIST_HEAD_NOLOCK(, conference_bridge_user) users_list;        /*!< List of users participating in the conference bridge */
 160         struct ast_channel *playback_chan;                                /*!< Channel used for playback into the conference bridge */
 161         ast_mutex_t playback_lock;                                        /*!< Lock used for playback channel */
 162 };
 163
 164 /*! \brief The structure that represents a conference bridge user */
 165 struct conference_bridge_user {
 166         struct conference_bridge *conference_bridge; /*!< Conference bridge they are participating in */
 167         struct ast_channel *chan;                    /*!< Asterisk channel participating */
 168         struct ast_flags flags;                      /*!< Flags passed in when the application was called */
 169         char *opt_args[OPTION_ARRAY_SIZE];           /*!< Arguments to options passed when application was called */
 170         struct ast_bridge_features features;         /*!< Bridge features structure */
 171         unsigned int kicked:1;                       /*!< User has been kicked from the conference */
 172         AST_LIST_ENTRY(conference_bridge_user) list; /*!< Linked list information */
 173 };
 174
 175 /*! \brief Container to hold all conference bridges in progress */
 176 static struct ao2_container *conference_bridges;
 177
 178 static int play_sound_file(struct conference_bridge *conference_bridge, const char *filename);
 179
 180 /*! \brief Hashing function used for conference bridges container */
 181 static int conference_bridge_hash_cb(const void *obj, const int flags)
 182 {
 183         const struct conference_bridge *conference_bridge = obj;
 184         return ast_str_case_hash(conference_bridge->name);
 185 }
 186
 187 /*! \brief Comparison function used for conference bridges container */
 188 static int conference_bridge_cmp_cb(void *obj, void *arg, int flags)
 189 {
 190         const struct conference_bridge *conference_bridge0 = obj, *conference_bridge1 = arg;
 191         return (!strcasecmp(conference_bridge0->name, conference_bridge1->name) ? CMP_MATCH | CMP_STOP : 0);
 192 }
 193
 194 /*!
 195  * \brief Announce number of users in the conference bridge to the caller
 196  *
 197  * \param conference_bridge Conference bridge to peek at
 198  * \param conference_bridge_user Caller
 199  *
 200  * \return Returns nothing
 201  */
 202 static void announce_user_count(struct conference_bridge *conference_bridge, struct conference_bridge_user *conference_bridge_user)
 203 {
 204         if (conference_bridge->users == 1) {
 205                 /* Awww we are the only person in the conference bridge */
 206                 return;
 207         } else if (conference_bridge->users == 2) {
 208                 /* Eep, there is one other person */
 209                 if (ast_stream_and_wait(conference_bridge_user->chan, "conf-onlyone", "")) {
 210                         return;
 211                 }
 212         } else {
 213                 /* Alas multiple others in here */
 214                 if (ast_stream_and_wait(conference_bridge_user->chan, "conf-thereare", "")) {
 215                         return;
 216                 }
 217                 if (ast_say_number(conference_bridge_user->chan, conference_bridge->users - 1, "", conference_bridge_user->chan->language, NULL)) {
 218                         return;
 219                 }
 220                 if (ast_stream_and_wait(conference_bridge_user->chan, "conf-otherinparty", "")) {
 221                         return;
 222                 }
 223         }
 224 }
 225
 226 /*!
 227  * \brief Play back an audio file to a channel
 228  *
 229  * \param conference_bridge Conference bridge they are in
 230  * \param chan Channel to play audio prompt to
 231  * \param file Prompt to play
 232  *
 233  * \return Returns nothing
 234  *
 235  * \note This function assumes that conference_bridge is locked
 236  */
 237 static void play_prompt_to_channel(struct conference_bridge *conference_bridge, struct ast_channel *chan, const char *file)
 238 {
 239         ao2_unlock(conference_bridge);
 240         ast_stream_and_wait(chan, file, "");
 241         ao2_lock(conference_bridge);
 242 }
 243
 244 /*!
 245  * \brief Perform post-joining marked specific actions
 246  *
 247  * \param conference_bridge Conference bridge being joined
 248  * \param conference_bridge_user Conference bridge user joining
 249  *
 250  * \return Returns nothing
 251  */
 252 static void post_join_marked(struct conference_bridge *conference_bridge, struct conference_bridge_user *conference_bridge_user)
 253 {
 254         if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER)) {
 255                 struct conference_bridge_user *other_conference_bridge_user = NULL;
 256
 257                 /* If we are not the first marked user to join just bail out now */
 258                 if (conference_bridge->markedusers >= 2) {
 259                         return;
 260                 }
 261
 262                 /* Iterate through every participant stopping MOH on them if need be */
 263                 AST_LIST_TRAVERSE(&conference_bridge->users_list, other_conference_bridge_user, list) {
 264                         if (other_conference_bridge_user == conference_bridge_user) {
 265                                 continue;
 266                         }
 267                         if (ast_test_flag(&other_conference_bridge_user->flags, OPTION_MUSICONHOLD) && !ast_bridge_suspend(conference_bridge->bridge, other_conference_bridge_user->chan)) {
 268                                 ast_moh_stop(other_conference_bridge_user->chan);
 269                                 ast_bridge_unsuspend(conference_bridge->bridge, other_conference_bridge_user->chan);
 270                         }
 271                 }
 272
 273                 /* Next play the audio file stating they are going to be placed into the conference */
 274                 ao2_unlock(conference_bridge);
 275                 ast_autoservice_start(conference_bridge_user->chan);
 276                 play_sound_file(conference_bridge, "conf-placeintoconf");
 277                 ast_autoservice_stop(conference_bridge_user->chan);
 278                 ao2_lock(conference_bridge);
 279
 280                 /* Finally iterate through and unmute them all */
 281                 AST_LIST_TRAVERSE(&conference_bridge->users_list, other_conference_bridge_user, list) {
 282                         if (other_conference_bridge_user == conference_bridge_user) {
 283                                 continue;
 284                         }
 285                         other_conference_bridge_user->features.mute = 0;
 286                 }
 287
 288         } else {
 289                 /* If a marked user already exists in the conference bridge we can just bail out now */
 290                 if (conference_bridge->markedusers) {
 291                         return;
 292                 }
 293                 /* Be sure we are muted so we can't talk to anybody else waiting */
 294                 conference_bridge_user->features.mute = 1;
 295                 /* If we have not been quieted play back that they are waiting for the leader */
 296                 if (!ast_test_flag(&conference_bridge_user->flags, OPTION_QUIET)) {
 297                         play_prompt_to_channel(conference_bridge, conference_bridge_user->chan, "conf-waitforleader");
 298                 }
 299                 /* Start music on hold if needed */
 300                 /* We need to recheck the markedusers value here. play_prompt_to_channel unlocks the conference bridge, potentially
 301                  * allowing a marked user to enter while the prompt was playing
 302                  */
 303                 if (!conference_bridge->markedusers && ast_test_flag(&conference_bridge_user->flags, OPTION_MUSICONHOLD)) {
 304                         ast_moh_start(conference_bridge_user->chan, conference_bridge_user->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
 305                 }
 306         }
 307 }
 308
 309 /*!
 310  * \brief Perform post-joining non-marked specific actions
 311  *
 312  * \param conference_bridge Conference bridge being joined
 313  * \param conference_bridge_user Conference bridge user joining
 314  *
 315  * \return Returns nothing
 316  */
 317 static void post_join_unmarked(struct conference_bridge *conference_bridge, struct conference_bridge_user *conference_bridge_user)
 318 {
 319         /* Play back audio prompt and start MOH if need be if we are the first participant */
 320         if (conference_bridge->users == 1) {
 321                 /* If audio prompts have not been quieted or this prompt quieted play it on out */
 322                 if (!ast_test_flag(&conference_bridge_user->flags, OPTION_QUIET | OPTION_NOONLYPERSON)) {
 323                         play_prompt_to_channel(conference_bridge, conference_bridge_user->chan, "conf-onlyperson");
 324                 }
 325                 /* If we need to start music on hold on the channel do so now */
 326                 /* We need to re-check the number of users in the conference bridge here because another conference bridge
 327                  * participant could have joined while the above prompt was playing for the first user.
 328                  */
 329                 if (conference_bridge->users == 1 && ast_test_flag(&conference_bridge_user->flags, OPTION_MUSICONHOLD)) {
 330                         ast_moh_start(conference_bridge_user->chan, conference_bridge_user->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
 331                 }
 332                 return;
 333         }
 334
 335         /* Announce number of users if need be */
 336         if (ast_test_flag(&conference_bridge_user->flags, OPTION_ANNOUNCEUSERCOUNT)) {
 337                 ao2_unlock(conference_bridge);
 338                 announce_user_count(conference_bridge, conference_bridge_user);
 339                 ao2_lock(conference_bridge);
 340         }
 341
 342         /* If we are the second participant we may need to stop music on hold on the first */
 343         if (conference_bridge->users == 2) {
 344                 struct conference_bridge_user *first_participant = AST_LIST_FIRST(&conference_bridge->users_list);
 345
 346                 /* Temporarily suspend the above participant from the bridge so we have control to stop MOH if needed */
 347                 if (ast_test_flag(&first_participant->flags, OPTION_MUSICONHOLD) && !ast_bridge_suspend(conference_bridge->bridge, first_participant->chan)) {
 348                         ast_moh_stop(first_participant->chan);
 349                         ast_bridge_unsuspend(conference_bridge->bridge, first_participant->chan);
 350                 }
 351         }
 352 }
 353
 354 /*!
 355  * \brief Destroy a conference bridge
 356  *
 357  * \param obj The conference bridge object
 358  *
 359  * \return Returns nothing
 360  */
 361 static void destroy_conference_bridge(void *obj)
 362 {
 363         struct conference_bridge *conference_bridge = obj;
 364
 365         ast_debug(1, "Destroying conference bridge '%s'\n", conference_bridge->name);
 366
 367         ast_mutex_destroy(&conference_bridge->playback_lock);
 368
 369         if (conference_bridge->playback_chan) {
 370                 struct ast_channel *underlying_channel = conference_bridge->playback_chan->tech->bridged_channel(conference_bridge->playback_chan, NULL);
 371                 ast_hangup(underlying_channel);
 372                 ast_hangup(conference_bridge->playback_chan);
 373                 conference_bridge->playback_chan = NULL;
 374         }
 375
 376         /* Destroying a conference bridge is simple, all we have to do is destroy the bridging object */
 377         if (conference_bridge->bridge) {
 378                 ast_bridge_destroy(conference_bridge->bridge);
 379                 conference_bridge->bridge = NULL;
 380         }
 381 }
 382
 383 /*!
 384  * \brief Join a conference bridge
 385  *
 386  * \param name The conference name
 387  * \param conference_bridge_user Conference bridge user structure
 388  *
 389  * \return A pointer to the conference bridge struct, or NULL if the conference room wasn't found.
 390  */
 391 static struct conference_bridge *join_conference_bridge(const char *name, struct conference_bridge_user *conference_bridge_user)
 392 {
 393         struct conference_bridge *conference_bridge = NULL;
 394         struct conference_bridge tmp;
 395
 396         ast_copy_string(tmp.name, name, sizeof(tmp.name));
 397
 398         /* We explictly lock the conference bridges container ourselves so that other callers can not create duplicate conferences at the same */
 399         ao2_lock(conference_bridges);
 400
 401         ast_debug(1, "Trying to find conference bridge '%s'\n", name);
 402
 403         /* Attempt to find an existing conference bridge */
 404         conference_bridge = ao2_find(conference_bridges, &tmp, OBJ_POINTER);
 405
 406         /* When finding a conference bridge that already exists make sure that it is not locked, and if so that we are not an admin */
 407         if (conference_bridge && conference_bridge->locked && !ast_test_flag(&conference_bridge_user->flags, OPTION_ADMIN)) {
 408                 ao2_unlock(conference_bridges);
 409                 ao2_ref(conference_bridge, -1);
 410                 ast_debug(1, "Conference bridge '%s' is locked and caller is not an admin\n", name);
 411                 ast_stream_and_wait(conference_bridge_user->chan, "conf-locked", "");
 412                 return NULL;
 413         }
 414
 415         /* If no conference bridge was found see if we can create one */
 416         if (!conference_bridge) {
 417                 /* Try to allocate memory for a new conference bridge, if we fail... this won't end well. */
 418                 if (!(conference_bridge = ao2_alloc(sizeof(*conference_bridge), destroy_conference_bridge))) {
 419                         ao2_unlock(conference_bridges);
 420                         ast_log(LOG_ERROR, "Conference bridge '%s' does not exist.\n", name);
 421                         return NULL;
 422                 }
 423
 424                 /* Setup conference bridge parameters */
 425                 ast_copy_string(conference_bridge->name, name, sizeof(conference_bridge->name));
 426
 427                 /* Create an actual bridge that will do the audio mixing */
 428                 if (!(conference_bridge->bridge = ast_bridge_new(AST_BRIDGE_CAPABILITY_1TO1MIX, AST_BRIDGE_FLAG_SMART))) {
 429                         ao2_ref(conference_bridge, -1);
 430                         conference_bridge = NULL;
 431                         ao2_unlock(conference_bridges);
 432                         ast_log(LOG_ERROR, "Conference bridge '%s' could not be created.\n", name);
 433                         return NULL;
 434                 }
 435
 436                 /* Setup lock for playback channel */
 437                 ast_mutex_init(&conference_bridge->playback_lock);
 438
 439                 /* Link it into the conference bridges container */
 440                 ao2_link(conference_bridges, conference_bridge);
 441
 442                 ast_debug(1, "Created conference bridge '%s' and linked to container '%p'\n", name, conference_bridges);
 443         }
 444
 445         ao2_unlock(conference_bridges);
 446
 447         /* Setup conference bridge user parameters */
 448         conference_bridge_user->conference_bridge = conference_bridge;
 449
 450         ao2_lock(conference_bridge);
 451
 452         /* All good to go, add them in */
 453         AST_LIST_INSERT_TAIL(&conference_bridge->users_list, conference_bridge_user, list);
 454
 455         /* Increment the users count on the bridge, but record it as it is going to need to be known right after this */
 456         conference_bridge->users++;
 457
 458         /* If the caller is a marked user bump up the count */
 459         if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER)) {
 460                 conference_bridge->markedusers++;
 461         }
 462
 463         /* If the caller is a marked user or is waiting for a marked user to enter pass 'em off, otherwise pass them off to do regular joining stuff */
 464         if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER | OPTION_WAITMARKED)) {
 465                 post_join_marked(conference_bridge, conference_bridge_user);
 466         } else {
 467                 post_join_unmarked(conference_bridge, conference_bridge_user);
 468         }
 469
 470         ao2_unlock(conference_bridge);
 471
 472         return conference_bridge;
 473 }
 474
 475 /*!
 476  * \brief Leave a conference bridge
 477  *
 478  * \param conference_bridge The conference bridge to leave
 479  * \param conference_bridge_user The conference bridge user structure
 480  *
 481  */
 482 static void  leave_conference_bridge(struct conference_bridge *conference_bridge, struct conference_bridge_user *conference_bridge_user)
 483 {
 484         ao2_lock(conference_bridge);
 485
 486         /* If this caller is a marked user bump down the count */
 487         if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER)) {
 488                 conference_bridge->markedusers--;
 489         }
 490
 491         /* Decrement the users count while keeping the previous participant count */
 492         conference_bridge->users--;
 493
 494         /* Drop conference bridge user from the list, they be going bye bye */
 495         AST_LIST_REMOVE(&conference_bridge->users_list, conference_bridge_user, list);
 496
 497         /* If there are still users in the conference bridge we may need to do things (such as start MOH on them) */
 498         if (conference_bridge->users) {
 499                 if (ast_test_flag(&conference_bridge_user->flags, OPTION_MARKEDUSER) && !conference_bridge->markedusers) {
 500                         struct conference_bridge_user *other_participant = NULL;
 501
 502                         /* Start out with muting everyone */
 503                         AST_LIST_TRAVERSE(&conference_bridge->users_list, other_participant, list) {
 504                                 other_participant->features.mute = 1;
 505                         }
 506
 507                         /* Play back the audio prompt saying the leader has left the conference */
 508                         ao2_unlock(conference_bridge);
 509                         ast_autoservice_start(conference_bridge_user->chan);
 510                         play_sound_file(conference_bridge, "conf-leaderhasleft");
 511                         ast_autoservice_stop(conference_bridge_user->chan);
 512                         ao2_lock(conference_bridge);
 513
 514                         /* Now on to starting MOH if needed */
 515                         AST_LIST_TRAVERSE(&conference_bridge->users_list, other_participant, list) {
 516                                 if (ast_test_flag(&other_participant->flags, OPTION_MUSICONHOLD) && !ast_bridge_suspend(conference_bridge->bridge, other_participant->chan)) {
 517                                         ast_moh_start(other_participant->chan, other_participant->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
 518                                         ast_bridge_unsuspend(conference_bridge->bridge, other_participant->chan);
 519                                 }
 520                         }
 521                 } else if (conference_bridge->users == 1) {
 522                         /* Of course if there is one other person in here we may need to start up MOH on them */
 523                         struct conference_bridge_user *first_participant = AST_LIST_FIRST(&conference_bridge->users_list);
 524
 525                         if (ast_test_flag(&first_participant->flags, OPTION_MUSICONHOLD) && !ast_bridge_suspend(conference_bridge->bridge, first_participant->chan)) {
 526                                 ast_moh_start(first_participant->chan, first_participant->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
 527                                 ast_bridge_unsuspend(conference_bridge->bridge, first_participant->chan);
 528                         }
 529                 }
 530         } else {
 531                 ao2_unlink(conference_bridges, conference_bridge);
 532         }
 533
 534         /* Done mucking with the conference bridge, huzzah */
 535         ao2_unlock(conference_bridge);
 536
 537         ao2_ref(conference_bridge, -1);
 538 }
 539
 540 /*!
 541  * \brief Play sound file into conference bridge
 542  *
 543  * \param conference_bridge The conference bridge to play sound file into
 544  * \param filename Sound file to play
 545  *
 546  * \retval 0 success
 547  * \retval -1 failure
 548  */
 549 static int play_sound_file(struct conference_bridge *conference_bridge, const char *filename)
 550 {
 551         struct ast_channel *underlying_channel;
 552
 553         ast_mutex_lock(&conference_bridge->playback_lock);
 554
 555         if (!(conference_bridge->playback_chan)) {
 556                 int cause;
 557
 558                 if (!(conference_bridge->playback_chan = ast_request("Bridge", AST_FORMAT_SLINEAR, "", &cause))) {
 559                         ast_mutex_unlock(&conference_bridge->playback_lock);
 560                         return -1;
 561                 }
 562
 563                 conference_bridge->playback_chan->bridge = conference_bridge->bridge;
 564
 565                 if (ast_call(conference_bridge->playback_chan, "", 0)) {
 566                         ast_hangup(conference_bridge->playback_chan);
 567                         conference_bridge->playback_chan = NULL;
 568                         ast_mutex_unlock(&conference_bridge->playback_lock);
 569                         return -1;
 570                 }
 571
 572                 ast_debug(1, "Created a playback channel to conference bridge '%s'\n", conference_bridge->name);
 573
 574                 underlying_channel = conference_bridge->playback_chan->tech->bridged_channel(conference_bridge->playback_chan, NULL);
 575         } else {
 576                 /* Channel was already available so we just need to add it back into the bridge */
 577                 underlying_channel = conference_bridge->playback_chan->tech->bridged_channel(conference_bridge->playback_chan, NULL);
 578                 ast_bridge_impart(conference_bridge->bridge, underlying_channel, NULL, NULL);
 579         }
 580
 581         /* The channel is all under our control, in goes the prompt */
 582         ast_stream_and_wait(conference_bridge->playback_chan, filename, "");
 583
 584         ast_debug(1, "Departing underlying channel '%s' from bridge '%p'\n", underlying_channel->name, conference_bridge->bridge);
 585         ast_bridge_depart(conference_bridge->bridge, underlying_channel);
 586
 587         ast_mutex_unlock(&conference_bridge->playback_lock);
 588
 589         return 0;
 590 }
 591
 592 /*!
 593  * \brief DTMF Menu Callback
 594  *
 595  * \param bridge Bridge this is involving
 596  * \param bridge_channel Bridged channel this is involving
 597  * \param hook_pvt User's conference bridge structure
 598  *
 599  * \retval 0 success
 600  * \retval -1 failure
 601  */
 602 static int menu_callback(struct ast_bridge *bridge, struct ast_bridge_channel *bridge_channel, void *hook_pvt)
 603 {
 604         struct conference_bridge_user *conference_bridge_user = hook_pvt;
 605         struct conference_bridge *conference_bridge = conference_bridge_user->conference_bridge;
 606         int digit, res = 0, isadmin = ast_test_flag(&conference_bridge_user->flags, OPTION_ADMIN);
 607
 608         /* See if music on hold is playing */
 609         ao2_lock(conference_bridge);
 610         if (conference_bridge->users == 1 && ast_test_flag(&conference_bridge_user->flags, OPTION_MUSICONHOLD)) {
 611                 /* Just us so MOH is probably indeed going, let's stop it */
 612                 ast_moh_stop(bridge_channel->chan);
 613         }
 614         ao2_unlock(conference_bridge);
 615
 616         /* Try to play back the user menu, if it fails pass this back up so the bridging core will act on it */
 617         if (ast_streamfile(bridge_channel->chan, (isadmin ? "conf-adminmenu" : "conf-usermenu"), bridge_channel->chan->language)) {
 618                 res = -1;
 619                 goto finished;
 620         }
 621
 622         /* Wait for them to enter a digit from the user menu options */
 623         digit = ast_waitstream(bridge_channel->chan, AST_DIGIT_ANY);
 624         ast_stopstream(bridge_channel->chan);
 625
 626         if (digit == '1') {
 627                 /* 1 - Mute or unmute yourself, note we only allow manipulation if they aren't waiting for a marked user or if marked users exist */
 628                 if (!ast_test_flag(&conference_bridge_user->flags, OPTION_WAITMARKED) || conference_bridge->markedusers) {
 629                         conference_bridge_user->features.mute = (!conference_bridge_user->features.mute ? 1 : 0);
 630                 }
 631                 res = ast_stream_and_wait(bridge_channel->chan, (conference_bridge_user->features.mute ? "conf-muted" : "conf-unmuted"), "");
 632         } else if (isadmin && digit == '2') {
 633                 /* 2 - Unlock or lock conference */
 634                 conference_bridge->locked = (!conference_bridge->locked ? 1 : 0);
 635                 res = ast_stream_and_wait(bridge_channel->chan, (conference_bridge->locked ? "conf-lockednow" : "conf-unlockednow"), "");
 636         } else if (isadmin && digit == '3') {
 637                 /* 3 - Eject last user */
 638                 struct conference_bridge_user *last_participant = NULL;
 639
 640                 ao2_lock(conference_bridge);
 641                 if (((last_participant = AST_LIST_LAST(&conference_bridge->users_list)) == conference_bridge_user) || (ast_test_flag(&last_participant->flags, OPTION_ADMIN))) {
 642                         ao2_unlock(conference_bridge);
 643                         res = ast_stream_and_wait(bridge_channel->chan, "conf-errormenu", "");
 644                 } else {
 645                         last_participant->kicked = 1;
 646                         ast_bridge_remove(conference_bridge->bridge, last_participant->chan);
 647                         ao2_unlock(conference_bridge);
 648                 }
 649         } else if (digit == '4') {
 650                 /* 4 - Decrease listening volume */
 651                 ast_audiohook_volume_adjust(conference_bridge_user->chan, AST_AUDIOHOOK_DIRECTION_WRITE, -1);
 652         } else if (digit == '6') {
 653                 /* 6 - Increase listening volume */
 654                 ast_audiohook_volume_adjust(conference_bridge_user->chan, AST_AUDIOHOOK_DIRECTION_WRITE, 1);
 655         } else if (digit == '7') {
 656                 /* 7 - Decrease talking volume */
 657                 ast_audiohook_volume_adjust(conference_bridge_user->chan, AST_AUDIOHOOK_DIRECTION_READ, -1);
 658         } else if (digit == '8') {
 659                 /* 8 - Exit the IVR */
 660         } else if (digit == '9') {
 661                 /* 9 - Increase talking volume */
 662                 ast_audiohook_volume_adjust(conference_bridge_user->chan, AST_AUDIOHOOK_DIRECTION_READ, 1);
 663         } else {
 664                 /* No valid option was selected */
 665                 res = ast_stream_and_wait(bridge_channel->chan, "conf-errormenu", "");
 666         }
 667
 668  finished:
 669         /* See if music on hold needs to be started back up again */
 670         ao2_lock(conference_bridge);
 671         if (conference_bridge->users == 1 && ast_test_flag(&conference_bridge_user->flags, OPTION_MUSICONHOLD)) {
 672                 ast_moh_start(bridge_channel->chan, conference_bridge_user->opt_args[OPTION_MUSICONHOLD_CLASS], NULL);
 673         }
 674         ao2_unlock(conference_bridge);
 675
 676         bridge_channel->state = AST_BRIDGE_CHANNEL_STATE_WAIT;
 677
 678         return res;
 679 }
 680
 681 /*! \brief The ConfBridge application */
 682 static int confbridge_exec(struct ast_channel *chan, void *data)
 683 {
 684         int res = 0, volume_adjustments[2];
 685         char *parse;
 686         struct conference_bridge *conference_bridge = NULL;
 687         struct conference_bridge_user conference_bridge_user = {
 688                 .chan = chan,
 689         };
 690         const char *tmp, *join_sound = NULL, *leave_sound = NULL;
 691         AST_DECLARE_APP_ARGS(args,
 692                 AST_APP_ARG(conf_name);
 693                 AST_APP_ARG(options);
 694         );
 695
 696         if (ast_strlen_zero(data)) {
 697                 ast_log(LOG_WARNING, "%s requires an argument (conference name[,options])\n", app);
 698                 return -1;
 699         }
 700
 701         /* We need to make a copy of the input string if we are going to modify it! */
 702         parse = ast_strdupa(data);
 703
 704         AST_STANDARD_APP_ARGS(args, parse);
 705
 706         if (args.argc == 2) {
 707                 ast_app_parse_options(app_opts, &conference_bridge_user.flags, conference_bridge_user.opt_args, args.options);
 708         }
 709
 710         /* Look for a conference bridge matching the provided name */
 711         if (!(conference_bridge = join_conference_bridge(args.conf_name, &conference_bridge_user))) {
 712                 return -1;
 713         }
 714
 715         /* Keep a copy of volume adjustments so we can restore them later if need be */
 716         volume_adjustments[0] = ast_audiohook_volume_get(chan, AST_AUDIOHOOK_DIRECTION_READ);
 717         volume_adjustments[1] = ast_audiohook_volume_get(chan, AST_AUDIOHOOK_DIRECTION_WRITE);
 718
 719         /* Always initialize the features structure, we are in most cases always going to need it. */
 720         ast_bridge_features_init(&conference_bridge_user.features);
 721
 722         /* If the menu option is enabled provide a user or admin menu as a custom feature hook */
 723         if (ast_test_flag(&conference_bridge_user.flags, OPTION_MENU)) {
 724                 ast_bridge_features_hook(&conference_bridge_user.features, "#", menu_callback, &conference_bridge_user);
 725         }
 726
 727         /* If the caller should be joined already muted, make it so */
 728         if (ast_test_flag(&conference_bridge_user.flags, OPTION_STARTMUTED)) {
 729                 conference_bridge_user.features.mute = 1;
 730         }
 731
 732         /* Grab join/leave sounds from the channel */
 733         ast_channel_lock(chan);
 734         if ((tmp = pbx_builtin_getvar_helper(chan, "CONFBRIDGE_JOIN_SOUND"))) {
 735                 join_sound = ast_strdupa(tmp);
 736         }
 737         if ((tmp = pbx_builtin_getvar_helper(chan, "CONFBRIDGE_LEAVE_SOUND"))) {
 738                 leave_sound = ast_strdupa(tmp);
 739         }
 740         ast_channel_unlock(chan);
 741
 742         /* If there is 1 or more people already in the conference then play our join sound unless overridden */
 743         if (!ast_test_flag(&conference_bridge_user.flags, OPTION_QUIET) && !ast_strlen_zero(join_sound) && conference_bridge->users >= 2) {
 744                 ast_autoservice_start(chan);
 745                 play_sound_file(conference_bridge, join_sound);
 746                 ast_autoservice_stop(chan);
 747         }
 748
 749         /* Join our conference bridge for real */
 750         ast_bridge_join(conference_bridge->bridge, chan, NULL, &conference_bridge_user.features);
 751
 752         /* If there is 1 or more people (not including us) already in the conference then play our leave sound unless overridden */
 753         if (!ast_test_flag(&conference_bridge_user.flags, OPTION_QUIET) && !ast_strlen_zero(leave_sound) && conference_bridge->users >= 2) {
 754                 ast_autoservice_start(chan);
 755                 play_sound_file(conference_bridge, leave_sound);
 756                 ast_autoservice_stop(chan);
 757         }
 758
 759         /* Easy as pie, depart this channel from the conference bridge */
 760         leave_conference_bridge(conference_bridge, &conference_bridge_user);
 761         conference_bridge = NULL;
 762
 763         /* Can't forget to clean up the features structure, or else we risk a memory leak */
 764         ast_bridge_features_cleanup(&conference_bridge_user.features);
 765
 766         /* If the user was kicked from the conference play back the audio prompt for it */
 767         if (!ast_test_flag(&conference_bridge_user.flags, OPTION_QUIET) && conference_bridge_user.kicked) {
 768                 res = ast_stream_and_wait(chan, "conf-kicked", "");
 769         }
 770
 771         /* Restore volume adjustments to previous values in case they were changed */
 772         if (volume_adjustments[0]) {
 773                 ast_audiohook_volume_set(chan, AST_AUDIOHOOK_DIRECTION_READ, volume_adjustments[0]);
 774         }
 775         if (volume_adjustments[1]) {
 776                 ast_audiohook_volume_set(chan, AST_AUDIOHOOK_DIRECTION_WRITE, volume_adjustments[1]);
 777         }
 778
 779         return res;
 780 }
 781
 782 /*! \brief Called when module is being unloaded */
 783 static int unload_module(void)
 784 {
 785         int res = ast_unregister_application(app);
 786
 787         /* Get rid of the conference bridges container. Since we only allow dynamic ones none will be active. */
 788         ao2_ref(conference_bridges, -1);
 789
 790         return res;
 791 }
 792
 793 /*! \brief Called when module is being loaded */
 794 static int load_module(void)
 795 {
 796         /* Create a container to hold the conference bridges */
 797         if (!(conference_bridges = ao2_container_alloc(CONFERENCE_BRIDGE_BUCKETS, conference_bridge_hash_cb, conference_bridge_cmp_cb))) {
 798                 return AST_MODULE_LOAD_DECLINE;
 799         }
 800
 801         if (ast_register_application_xml(app, confbridge_exec)) {
 802                 ao2_ref(conference_bridges, -1);
 803                 return AST_MODULE_LOAD_DECLINE;
 804         }
 805
 806         return AST_MODULE_LOAD_SUCCESS;
 807 }
 808
 809 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Conference Bridge Application");