main/dial.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2007, 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 Dialing API
  22  *
  23  * \author Joshua Colp <jcolp@digium.com>
  24  */
  25
  26 /*** MODULEINFO
  27         <support_level>core</support_level>
  28  ***/
  29
  30 #include "asterisk.h"
  31
  32 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  33
  34 #include <sys/time.h>
  35 #include <signal.h>
  36
  37 #include "asterisk/channel.h"
  38 #include "asterisk/utils.h"
  39 #include "asterisk/lock.h"
  40 #include "asterisk/linkedlists.h"
  41 #include "asterisk/dial.h"
  42 #include "asterisk/pbx.h"
  43 #include "asterisk/musiconhold.h"
  44 #include "asterisk/app.h"
  45 #include "asterisk/causes.h"
  46 #include "asterisk/stasis_channels.h"
  47
  48 /*! \brief Main dialing structure. Contains global options, channels being dialed, and more! */
  49 struct ast_dial {
  50         int num;                                           /*!< Current number to give to next dialed channel */
  51         int timeout;                                       /*!< Maximum time allowed for dial attempts */
  52         int actual_timeout;                                /*!< Actual timeout based on all factors (ie: channels) */
  53         enum ast_dial_result state;                        /*!< Status of dial */
  54         void *options[AST_DIAL_OPTION_MAX];                /*!< Global options */
  55         ast_dial_state_callback state_callback;            /*!< Status callback */
  56         void *user_data;                                   /*!< Attached user data */
  57         AST_LIST_HEAD(, ast_dial_channel) channels; /*!< Channels being dialed */
  58         pthread_t thread;                                  /*!< Thread (if running in async) */
  59         struct ast_callid *callid;                         /*!< callid pointer (if running in async) */
  60         ast_mutex_t lock;                                  /*! Lock to protect the thread information above */
  61 };
  62
  63 /*! \brief Dialing channel structure. Contains per-channel dialing options, asterisk channel, and more! */
  64 struct ast_dial_channel {
  65         int num;                                /*!< Unique number for dialed channel */
  66         int timeout;                            /*!< Maximum time allowed for attempt */
  67         char *tech;                             /*!< Technology being dialed */
  68         char *device;                           /*!< Device being dialed */
  69         void *options[AST_DIAL_OPTION_MAX];     /*!< Channel specific options */
  70         int cause;                              /*!< Cause code in case of failure */
  71         unsigned int is_running_app:1;          /*!< Is this running an application? */
  72         struct ast_channel *owner;              /*!< Asterisk channel */
  73         AST_LIST_ENTRY(ast_dial_channel) list;  /*!< Linked list information */
  74 };
  75
  76 /*! \brief Typedef for dial option enable */
  77 typedef void *(*ast_dial_option_cb_enable)(void *data);
  78
  79 /*! \brief Typedef for dial option disable */
  80 typedef int (*ast_dial_option_cb_disable)(void *data);
  81
  82 /*! \brief Structure for 'ANSWER_EXEC' option */
  83 struct answer_exec_struct {
  84         char app[AST_MAX_APP]; /*!< Application name */
  85         char *args;            /*!< Application arguments */
  86 };
  87
  88 /*! \brief Enable function for 'ANSWER_EXEC' option */
  89 static void *answer_exec_enable(void *data)
  90 {
  91         struct answer_exec_struct *answer_exec = NULL;
  92         char *app = ast_strdupa((char*)data), *args = NULL;
  93
  94         /* Not giving any data to this option is bad, mmmk? */
  95         if (ast_strlen_zero(app))
  96                 return NULL;
  97
  98         /* Create new data structure */
  99         if (!(answer_exec = ast_calloc(1, sizeof(*answer_exec))))
 100                 return NULL;
 101
 102         /* Parse out application and arguments */
 103         if ((args = strchr(app, ','))) {
 104                 *args++ = '\0';
 105                 answer_exec->args = ast_strdup(args);
 106         }
 107
 108         /* Copy application name */
 109         ast_copy_string(answer_exec->app, app, sizeof(answer_exec->app));
 110
 111         return answer_exec;
 112 }
 113
 114 /*! \brief Disable function for 'ANSWER_EXEC' option */
 115 static int answer_exec_disable(void *data)
 116 {
 117         struct answer_exec_struct *answer_exec = data;
 118
 119         /* Make sure we have a value */
 120         if (!answer_exec)
 121                 return -1;
 122
 123         /* If arguments are present, free them too */
 124         if (answer_exec->args)
 125                 ast_free(answer_exec->args);
 126
 127         /* This is simple - just free the structure */
 128         ast_free(answer_exec);
 129
 130         return 0;
 131 }
 132
 133 static void *music_enable(void *data)
 134 {
 135         return ast_strdup(data);
 136 }
 137
 138 static int music_disable(void *data)
 139 {
 140         if (!data)
 141                 return -1;
 142
 143         ast_free(data);
 144
 145         return 0;
 146 }
 147
 148 /*! \brief Application execution function for 'ANSWER_EXEC' option */
 149 static void answer_exec_run(struct ast_dial *dial, struct ast_dial_channel *dial_channel, char *app, char *args)
 150 {
 151         struct ast_channel *chan = dial_channel->owner;
 152         struct ast_app *ast_app = pbx_findapp(app);
 153
 154         /* If the application was not found, return immediately */
 155         if (!ast_app)
 156                 return;
 157
 158         /* All is well... execute the application */
 159         pbx_exec(chan, ast_app, args);
 160
 161         /* If another thread is not taking over hang up the channel */
 162         ast_mutex_lock(&dial->lock);
 163         if (dial->thread != AST_PTHREADT_STOP) {
 164                 ast_hangup(chan);
 165                 dial_channel->owner = NULL;
 166         }
 167         ast_mutex_unlock(&dial->lock);
 168
 169         return;
 170 }
 171
 172 struct ast_option_types {
 173         enum ast_dial_option option;
 174         ast_dial_option_cb_enable enable;
 175         ast_dial_option_cb_disable disable;
 176 };
 177
 178 /*!
 179  * \brief Map options to respective handlers (enable/disable).
 180  *
 181  * \note This list MUST be perfectly kept in order with enum
 182  * ast_dial_option, or else madness will happen.
 183  */
 184 static const struct ast_option_types option_types[] = {
 185         { AST_DIAL_OPTION_RINGING, NULL, NULL },                                  /*!< Always indicate ringing to caller */
 186         { AST_DIAL_OPTION_ANSWER_EXEC, answer_exec_enable, answer_exec_disable }, /*!< Execute application upon answer in async mode */
 187         { AST_DIAL_OPTION_MUSIC, music_enable, music_disable },                   /*!< Play music to the caller instead of ringing */
 188         { AST_DIAL_OPTION_DISABLE_CALL_FORWARDING, NULL, NULL },                  /*!< Disable call forwarding on channels */
 189         { AST_DIAL_OPTION_MAX, NULL, NULL },                                      /*!< Terminator of list */
 190 };
 191
 192 /*! \brief Maximum number of channels we can watch at a time */
 193 #define AST_MAX_WATCHERS 256
 194
 195 /*! \brief Macro for finding the option structure to use on a dialed channel */
 196 #define FIND_RELATIVE_OPTION(dial, dial_channel, ast_dial_option) (dial_channel->options[ast_dial_option] ? dial_channel->options[ast_dial_option] : dial->options[ast_dial_option])
 197
 198 /*! \brief Macro that determines whether a channel is the caller or not */
 199 #define IS_CALLER(chan, owner) (chan == owner ? 1 : 0)
 200
 201 /*! \brief New dialing structure
 202  * \note Create a dialing structure
 203  * \return Returns a calloc'd ast_dial structure, NULL on failure
 204  */
 205 struct ast_dial *ast_dial_create(void)
 206 {
 207         struct ast_dial *dial = NULL;
 208
 209         /* Allocate new memory for structure */
 210         if (!(dial = ast_calloc(1, sizeof(*dial))))
 211                 return NULL;
 212
 213         /* Initialize list of channels */
 214         AST_LIST_HEAD_INIT(&dial->channels);
 215
 216         /* Initialize thread to NULL */
 217         dial->thread = AST_PTHREADT_NULL;
 218
 219         /* No timeout exists... yet */
 220         dial->timeout = -1;
 221         dial->actual_timeout = -1;
 222
 223         /* Can't forget about the lock */
 224         ast_mutex_init(&dial->lock);
 225
 226         return dial;
 227 }
 228
 229 /*! \brief Append a channel
 230  * \note Appends a channel to a dialing structure
 231  * \return Returns channel reference number on success, -1 on failure
 232  */
 233 int ast_dial_append(struct ast_dial *dial, const char *tech, const char *device)
 234 {
 235         struct ast_dial_channel *channel = NULL;
 236
 237         /* Make sure we have required arguments */
 238         if (!dial || !tech || !device)
 239                 return -1;
 240
 241         /* Allocate new memory for dialed channel structure */
 242         if (!(channel = ast_calloc(1, sizeof(*channel))))
 243                 return -1;
 244
 245         /* Record technology and device for when we actually dial */
 246         channel->tech = ast_strdup(tech);
 247         channel->device = ast_strdup(device);
 248
 249         /* Grab reference number from dial structure */
 250         channel->num = ast_atomic_fetchadd_int(&dial->num, +1);
 251
 252         /* No timeout exists... yet */
 253         channel->timeout = -1;
 254
 255         /* Insert into channels list */
 256         AST_LIST_INSERT_TAIL(&dial->channels, channel, list);
 257
 258         return channel->num;
 259 }
 260
 261 /*! \brief Helper function that requests all channels */
 262 static int begin_dial_prerun(struct ast_dial_channel *channel, struct ast_channel *chan, struct ast_format_cap *cap)
 263 {
 264         char numsubst[AST_MAX_EXTENSION];
 265         struct ast_format_cap *cap_all_audio = NULL;
 266         struct ast_format_cap *cap_request;
 267
 268         /* Copy device string over */
 269         ast_copy_string(numsubst, channel->device, sizeof(numsubst));
 270
 271         if (!ast_format_cap_is_empty(cap)) {
 272                 cap_request = cap;
 273         } else if (chan) {
 274                 cap_request = ast_channel_nativeformats(chan);
 275         } else {
 276                 cap_all_audio = ast_format_cap_alloc_nolock();
 277                 ast_format_cap_add_all_by_type(cap_all_audio, AST_FORMAT_TYPE_AUDIO);
 278                 cap_request = cap_all_audio;
 279         }
 280
 281         /* If we fail to create our owner channel bail out */
 282         if (!(channel->owner = ast_request(channel->tech, cap_request, chan, numsubst, &channel->cause))) {
 283                 cap_all_audio = ast_format_cap_destroy(cap_all_audio);
 284                 return -1;
 285         }
 286         cap_request = NULL;
 287         cap_all_audio = ast_format_cap_destroy(cap_all_audio);
 288
 289         ast_channel_appl_set(channel->owner, "AppDial2");
 290         ast_channel_data_set(channel->owner, "(Outgoing Line)");
 291         ast_publish_channel_state(channel->owner);
 292         memset(ast_channel_whentohangup(channel->owner), 0, sizeof(*ast_channel_whentohangup(channel->owner)));
 293
 294         /* Inherit everything from he who spawned this dial */
 295         if (chan) {
 296                 ast_channel_inherit_variables(chan, channel->owner);
 297                 ast_channel_datastore_inherit(chan, channel->owner);
 298
 299                 /* Copy over callerid information */
 300                 ast_party_redirecting_copy(ast_channel_redirecting(channel->owner), ast_channel_redirecting(chan));
 301
 302                 ast_channel_dialed(channel->owner)->transit_network_select = ast_channel_dialed(chan)->transit_network_select;
 303
 304                 ast_connected_line_copy_from_caller(ast_channel_connected(channel->owner), ast_channel_caller(chan));
 305
 306                 ast_channel_language_set(channel->owner, ast_channel_language(chan));
 307                 ast_channel_accountcode_set(channel->owner, ast_channel_accountcode(chan));
 308                 if (ast_strlen_zero(ast_channel_musicclass(channel->owner)))
 309                         ast_channel_musicclass_set(channel->owner, ast_channel_musicclass(chan));
 310
 311                 ast_channel_adsicpe_set(channel->owner, ast_channel_adsicpe(chan));
 312                 ast_channel_transfercapability_set(channel->owner, ast_channel_transfercapability(chan));
 313         }
 314
 315         return 0;
 316 }
 317
 318 int ast_dial_prerun(struct ast_dial *dial, struct ast_channel *chan, struct ast_format_cap *cap)
 319 {
 320         struct ast_dial_channel *channel;
 321         int res = -1;
 322
 323         AST_LIST_LOCK(&dial->channels);
 324         AST_LIST_TRAVERSE(&dial->channels, channel, list) {
 325                 if ((res = begin_dial_prerun(channel, chan, cap))) {
 326                         break;
 327                 }
 328         }
 329         AST_LIST_UNLOCK(&dial->channels);
 330
 331         return res;
 332 }
 333
 334 /*! \brief Helper function that does the beginning dialing per-appended channel */
 335 static int begin_dial_channel(struct ast_dial_channel *channel, struct ast_channel *chan, int async)
 336 {
 337         char numsubst[AST_MAX_EXTENSION];
 338         int res = 1;
 339
 340         /* If no owner channel exists yet execute pre-run */
 341         if (!channel->owner && begin_dial_prerun(channel, chan, NULL)) {
 342                 return 0;
 343         }
 344
 345         /* Copy device string over */
 346         ast_copy_string(numsubst, channel->device, sizeof(numsubst));
 347
 348         /* Attempt to actually call this device */
 349         if ((res = ast_call(channel->owner, numsubst, 0))) {
 350                 res = 0;
 351                 ast_hangup(channel->owner);
 352                 channel->owner = NULL;
 353         } else {
 354                 if (chan) {
 355                         ast_poll_channel_add(chan, channel->owner);
 356                 }
 357                 ast_channel_publish_dial(async ? NULL : chan, channel->owner, channel->device, NULL);
 358                 res = 1;
 359                 ast_verb(3, "Called %s\n", numsubst);
 360         }
 361
 362         return res;
 363 }
 364
 365 /*! \brief Helper function that does the beginning dialing per dial structure */
 366 static int begin_dial(struct ast_dial *dial, struct ast_channel *chan, int async)
 367 {
 368         struct ast_dial_channel *channel = NULL;
 369         int success = 0;
 370
 371         /* Iterate through channel list, requesting and calling each one */
 372         AST_LIST_LOCK(&dial->channels);
 373         AST_LIST_TRAVERSE(&dial->channels, channel, list) {
 374                 success += begin_dial_channel(channel, chan, async);
 375         }
 376         AST_LIST_UNLOCK(&dial->channels);
 377
 378         /* If number of failures matches the number of channels, then this truly failed */
 379         return success;
 380 }
 381
 382 /*! \brief Helper function to handle channels that have been call forwarded */
 383 static int handle_call_forward(struct ast_dial *dial, struct ast_dial_channel *channel, struct ast_channel *chan)
 384 {
 385         struct ast_channel *original = channel->owner;
 386         char *tmp = ast_strdupa(ast_channel_call_forward(channel->owner));
 387         char *tech = "Local", *device = tmp, *stuff;
 388
 389         /* If call forwarding is disabled just drop the original channel and don't attempt to dial the new one */
 390         if (FIND_RELATIVE_OPTION(dial, channel, AST_DIAL_OPTION_DISABLE_CALL_FORWARDING)) {
 391                 ast_hangup(original);
 392                 channel->owner = NULL;
 393                 return 0;
 394         }
 395
 396         /* Figure out the new destination */
 397         if ((stuff = strchr(tmp, '/'))) {
 398                 *stuff++ = '\0';
 399                 tech = tmp;
 400                 device = stuff;
 401         }
 402
 403         /* Drop old destination information */
 404         ast_free(channel->tech);
 405         ast_free(channel->device);
 406
 407         /* Update the dial channel with the new destination information */
 408         channel->tech = ast_strdup(tech);
 409         channel->device = ast_strdup(device);
 410         AST_LIST_UNLOCK(&dial->channels);
 411
 412         /* Finally give it a go... send it out into the world */
 413         begin_dial_channel(channel, chan, chan ? 0 : 1);
 414
 415         /* Drop the original channel */
 416         ast_hangup(original);
 417
 418         return 0;
 419 }
 420
 421 /*! \brief Helper function that finds the dialed channel based on owner */
 422 static struct ast_dial_channel *find_relative_dial_channel(struct ast_dial *dial, struct ast_channel *owner)
 423 {
 424         struct ast_dial_channel *channel = NULL;
 425
 426         AST_LIST_LOCK(&dial->channels);
 427         AST_LIST_TRAVERSE(&dial->channels, channel, list) {
 428                 if (channel->owner == owner)
 429                         break;
 430         }
 431         AST_LIST_UNLOCK(&dial->channels);
 432
 433         return channel;
 434 }
 435
 436 static void set_state(struct ast_dial *dial, enum ast_dial_result state)
 437 {
 438         dial->state = state;
 439
 440         if (dial->state_callback)
 441                 dial->state_callback(dial);
 442 }
 443
 444 /*! \brief Helper function that handles control frames WITH owner */
 445 static void handle_frame(struct ast_dial *dial, struct ast_dial_channel *channel, struct ast_frame *fr, struct ast_channel *chan)
 446 {
 447         if (fr->frametype == AST_FRAME_CONTROL) {
 448                 switch (fr->subclass.integer) {
 449                 case AST_CONTROL_ANSWER:
 450                         ast_verb(3, "%s answered %s\n", ast_channel_name(channel->owner), ast_channel_name(chan));
 451                         AST_LIST_LOCK(&dial->channels);
 452                         AST_LIST_REMOVE(&dial->channels, channel, list);
 453                         AST_LIST_INSERT_HEAD(&dial->channels, channel, list);
 454                         AST_LIST_UNLOCK(&dial->channels);
 455                         ast_channel_publish_dial(chan, channel->owner, channel->device, "ANSWER");
 456                         set_state(dial, AST_DIAL_RESULT_ANSWERED);
 457                         break;
 458                 case AST_CONTROL_BUSY:
 459                         ast_verb(3, "%s is busy\n", ast_channel_name(channel->owner));
 460                         ast_channel_publish_dial(chan, channel->owner, channel->device, "BUSY");
 461                         ast_hangup(channel->owner);
 462                         channel->owner = NULL;
 463                         break;
 464                 case AST_CONTROL_CONGESTION:
 465                         ast_verb(3, "%s is circuit-busy\n", ast_channel_name(channel->owner));
 466                         ast_channel_publish_dial(chan, channel->owner, channel->device, "CONGESTION");
 467                         ast_hangup(channel->owner);
 468                         channel->owner = NULL;
 469                         break;
 470                 case AST_CONTROL_INCOMPLETE:
 471                         ast_verb(3, "%s dialed Incomplete extension %s\n", ast_channel_name(channel->owner), ast_channel_exten(channel->owner));
 472                         ast_indicate(chan, AST_CONTROL_INCOMPLETE);
 473                         break;
 474                 case AST_CONTROL_RINGING:
 475                         ast_verb(3, "%s is ringing\n", ast_channel_name(channel->owner));
 476                         if (!dial->options[AST_DIAL_OPTION_MUSIC])
 477                                 ast_indicate(chan, AST_CONTROL_RINGING);
 478                         set_state(dial, AST_DIAL_RESULT_RINGING);
 479                         break;
 480                 case AST_CONTROL_PROGRESS:
 481                         ast_verb(3, "%s is making progress, passing it to %s\n", ast_channel_name(channel->owner), ast_channel_name(chan));
 482                         ast_indicate(chan, AST_CONTROL_PROGRESS);
 483                         set_state(dial, AST_DIAL_RESULT_PROGRESS);
 484                         break;
 485                 case AST_CONTROL_VIDUPDATE:
 486                         ast_verb(3, "%s requested a video update, passing it to %s\n", ast_channel_name(channel->owner), ast_channel_name(chan));
 487                         ast_indicate(chan, AST_CONTROL_VIDUPDATE);
 488                         break;
 489                 case AST_CONTROL_SRCUPDATE:
 490                         ast_verb(3, "%s requested a source update, passing it to %s\n", ast_channel_name(channel->owner), ast_channel_name(chan));
 491                         ast_indicate(chan, AST_CONTROL_SRCUPDATE);
 492                         break;
 493                 case AST_CONTROL_CONNECTED_LINE:
 494                         ast_verb(3, "%s connected line has changed, passing it to %s\n", ast_channel_name(channel->owner), ast_channel_name(chan));
 495                         if (ast_channel_connected_line_sub(channel->owner, chan, fr, 1) &&
 496                                 ast_channel_connected_line_macro(channel->owner, chan, fr, 1, 1)) {
 497                                 ast_indicate_data(chan, AST_CONTROL_CONNECTED_LINE, fr->data.ptr, fr->datalen);
 498                         }
 499                         break;
 500                 case AST_CONTROL_REDIRECTING:
 501                         ast_verb(3, "%s redirecting info has changed, passing it to %s\n", ast_channel_name(channel->owner), ast_channel_name(chan));
 502                         if (ast_channel_redirecting_sub(channel->owner, chan, fr, 1) &&
 503                                 ast_channel_redirecting_macro(channel->owner, chan, fr, 1, 1)) {
 504                                 ast_indicate_data(chan, AST_CONTROL_REDIRECTING, fr->data.ptr, fr->datalen);
 505                         }
 506                         break;
 507                 case AST_CONTROL_PROCEEDING:
 508                         ast_verb(3, "%s is proceeding, passing it to %s\n", ast_channel_name(channel->owner), ast_channel_name(chan));
 509                         ast_indicate(chan, AST_CONTROL_PROCEEDING);
 510                         set_state(dial, AST_DIAL_RESULT_PROCEEDING);
 511                         break;
 512                 case AST_CONTROL_HOLD:
 513                         ast_verb(3, "Call on %s placed on hold\n", ast_channel_name(chan));
 514                         ast_indicate(chan, AST_CONTROL_HOLD);
 515                         break;
 516                 case AST_CONTROL_UNHOLD:
 517                         ast_verb(3, "Call on %s left from hold\n", ast_channel_name(chan));
 518                         ast_indicate(chan, AST_CONTROL_UNHOLD);
 519                         break;
 520                 case AST_CONTROL_OFFHOOK:
 521                 case AST_CONTROL_FLASH:
 522                         break;
 523                 case AST_CONTROL_PVT_CAUSE_CODE:
 524                         ast_indicate_data(chan, AST_CONTROL_PVT_CAUSE_CODE, fr->data.ptr, fr->datalen);
 525                         break;
 526                 case -1:
 527                         /* Prod the channel */
 528                         ast_indicate(chan, -1);
 529                         break;
 530                 default:
 531                         break;
 532                 }
 533         }
 534
 535         return;
 536 }
 537
 538 /*! \brief Helper function that handles control frames WITHOUT owner */
 539 static void handle_frame_ownerless(struct ast_dial *dial, struct ast_dial_channel *channel, struct ast_frame *fr)
 540 {
 541         /* If we have no owner we can only update the state of the dial structure, so only look at control frames */
 542         if (fr->frametype != AST_FRAME_CONTROL)
 543                 return;
 544
 545         switch (fr->subclass.integer) {
 546         case AST_CONTROL_ANSWER:
 547                 ast_verb(3, "%s answered\n", ast_channel_name(channel->owner));
 548                 AST_LIST_LOCK(&dial->channels);
 549                 AST_LIST_REMOVE(&dial->channels, channel, list);
 550                 AST_LIST_INSERT_HEAD(&dial->channels, channel, list);
 551                 AST_LIST_UNLOCK(&dial->channels);
 552                 ast_channel_publish_dial(NULL, channel->owner, channel->device, "ANSWER");
 553                 set_state(dial, AST_DIAL_RESULT_ANSWERED);
 554                 break;
 555         case AST_CONTROL_BUSY:
 556                 ast_verb(3, "%s is busy\n", ast_channel_name(channel->owner));
 557                 ast_channel_publish_dial(NULL, channel->owner, channel->device, "BUSY");
 558                 ast_hangup(channel->owner);
 559                 channel->owner = NULL;
 560                 break;
 561         case AST_CONTROL_CONGESTION:
 562                 ast_verb(3, "%s is circuit-busy\n", ast_channel_name(channel->owner));
 563                 ast_channel_publish_dial(NULL, channel->owner, channel->device, "CONGESTION");
 564                 ast_hangup(channel->owner);
 565                 channel->owner = NULL;
 566                 break;
 567         case AST_CONTROL_RINGING:
 568                 ast_verb(3, "%s is ringing\n", ast_channel_name(channel->owner));
 569                 set_state(dial, AST_DIAL_RESULT_RINGING);
 570                 break;
 571         case AST_CONTROL_PROGRESS:
 572                 ast_verb(3, "%s is making progress\n", ast_channel_name(channel->owner));
 573                 set_state(dial, AST_DIAL_RESULT_PROGRESS);
 574                 break;
 575         case AST_CONTROL_PROCEEDING:
 576                 ast_verb(3, "%s is proceeding\n", ast_channel_name(channel->owner));
 577                 set_state(dial, AST_DIAL_RESULT_PROCEEDING);
 578                 break;
 579         default:
 580                 break;
 581         }
 582
 583         return;
 584 }
 585
 586 /*! \brief Helper function to handle when a timeout occurs on dialing attempt */
 587 static int handle_timeout_trip(struct ast_dial *dial, struct timeval start)
 588 {
 589         struct ast_dial_channel *channel = NULL;
 590         int diff = ast_tvdiff_ms(ast_tvnow(), start), lowest_timeout = -1, new_timeout = -1;
 591
 592         /* If there is no difference yet return the dial timeout so we can go again, we were likely interrupted */
 593         if (!diff) {
 594                 return dial->timeout;
 595         }
 596
 597         /* If the global dial timeout tripped switch the state to timeout so our channel loop will drop every channel */
 598         if (diff >= dial->timeout) {
 599                 set_state(dial, AST_DIAL_RESULT_TIMEOUT);
 600                 new_timeout = 0;
 601         }
 602
 603         /* Go through dropping out channels that have met their timeout */
 604         AST_LIST_TRAVERSE(&dial->channels, channel, list) {
 605                 if (dial->state == AST_DIAL_RESULT_TIMEOUT || diff >= channel->timeout) {
 606                         ast_hangup(channel->owner);
 607                         channel->owner = NULL;
 608                 } else if ((lowest_timeout == -1) || (lowest_timeout > channel->timeout)) {
 609                         lowest_timeout = channel->timeout;
 610                 }
 611         }
 612
 613         /* Calculate the new timeout using the lowest timeout found */
 614         if (lowest_timeout >= 0)
 615                 new_timeout = lowest_timeout - diff;
 616
 617         return new_timeout;
 618 }
 619
 620 const char *ast_hangup_cause_to_dial_status(int hangup_cause)
 621 {
 622         switch(hangup_cause) {
 623         case AST_CAUSE_BUSY:
 624                 return "BUSY";
 625         case AST_CAUSE_CONGESTION:
 626                 return "CONGESTION";
 627         case AST_CAUSE_NO_ROUTE_DESTINATION:
 628         case AST_CAUSE_UNREGISTERED:
 629                 return "CHANUNAVAIL";
 630         case AST_CAUSE_NO_ANSWER:
 631         default:
 632                 return "NOANSWER";
 633         }
 634 }
 635
 636 /*! \brief Helper function that basically keeps tabs on dialing attempts */
 637 static enum ast_dial_result monitor_dial(struct ast_dial *dial, struct ast_channel *chan)
 638 {
 639         int timeout = -1;
 640         struct ast_channel *cs[AST_MAX_WATCHERS], *who = NULL;
 641         struct ast_dial_channel *channel = NULL;
 642         struct answer_exec_struct *answer_exec = NULL;
 643         struct timeval start;
 644
 645         set_state(dial, AST_DIAL_RESULT_TRYING);
 646
 647         /* If the "always indicate ringing" option is set, change state to ringing and indicate to the owner if present */
 648         if (dial->options[AST_DIAL_OPTION_RINGING]) {
 649                 set_state(dial, AST_DIAL_RESULT_RINGING);
 650                 if (chan)
 651                         ast_indicate(chan, AST_CONTROL_RINGING);
 652         } else if (chan && dial->options[AST_DIAL_OPTION_MUSIC] &&
 653                 !ast_strlen_zero(dial->options[AST_DIAL_OPTION_MUSIC])) {
 654                 char *original_moh = ast_strdupa(ast_channel_musicclass(chan));
 655                 ast_indicate(chan, -1);
 656                 ast_channel_musicclass_set(chan, dial->options[AST_DIAL_OPTION_MUSIC]);
 657                 ast_moh_start(chan, dial->options[AST_DIAL_OPTION_MUSIC], NULL);
 658                 ast_channel_musicclass_set(chan, original_moh);
 659         }
 660
 661         /* Record start time for timeout purposes */
 662         start = ast_tvnow();
 663
 664         /* We actually figured out the maximum timeout we can do as they were added, so we can directly access the info */
 665         timeout = dial->actual_timeout;
 666
 667         /* Go into an infinite loop while we are trying */
 668         while ((dial->state != AST_DIAL_RESULT_UNANSWERED) && (dial->state != AST_DIAL_RESULT_ANSWERED) && (dial->state != AST_DIAL_RESULT_HANGUP) && (dial->state != AST_DIAL_RESULT_TIMEOUT)) {
 669                 int pos = 0, count = 0;
 670                 struct ast_frame *fr = NULL;
 671
 672                 /* Set up channel structure array */
 673                 pos = count = 0;
 674                 if (chan)
 675                         cs[pos++] = chan;
 676
 677                 /* Add channels we are attempting to dial */
 678                 AST_LIST_LOCK(&dial->channels);
 679                 AST_LIST_TRAVERSE(&dial->channels, channel, list) {
 680                         if (channel->owner) {
 681                                 cs[pos++] = channel->owner;
 682                                 count++;
 683                         }
 684                 }
 685                 AST_LIST_UNLOCK(&dial->channels);
 686
 687                 /* If we have no outbound channels in progress, switch state to unanswered and stop */
 688                 if (!count) {
 689                         set_state(dial, AST_DIAL_RESULT_UNANSWERED);
 690                         break;
 691                 }
 692
 693                 /* Just to be safe... */
 694                 if (dial->thread == AST_PTHREADT_STOP)
 695                         break;
 696
 697                 /* Wait for frames from channels */
 698                 who = ast_waitfor_n(cs, pos, &timeout);
 699
 700                 /* Check to see if our thread is being canceled */
 701                 if (dial->thread == AST_PTHREADT_STOP)
 702                         break;
 703
 704                 /* If the timeout no longer exists OR if we got no channel it basically means the timeout was tripped, so handle it */
 705                 if (!timeout || !who) {
 706                         timeout = handle_timeout_trip(dial, start);
 707                         continue;
 708                 }
 709
 710                 /* Find relative dial channel */
 711                 if (!chan || !IS_CALLER(chan, who))
 712                         channel = find_relative_dial_channel(dial, who);
 713
 714                 /* See if this channel has been forwarded elsewhere */
 715                 if (!ast_strlen_zero(ast_channel_call_forward(who))) {
 716                         handle_call_forward(dial, channel, chan);
 717                         continue;
 718                 }
 719
 720                 /* Attempt to read in a frame */
 721                 if (!(fr = ast_read(who))) {
 722                         /* If this is the caller then we switch state to hangup and stop */
 723                         if (chan && IS_CALLER(chan, who)) {
 724                                 set_state(dial, AST_DIAL_RESULT_HANGUP);
 725                                 break;
 726                         }
 727                         if (chan)
 728                                 ast_poll_channel_del(chan, channel->owner);
 729                         ast_channel_publish_dial(chan, who, channel->device, ast_hangup_cause_to_dial_status(ast_channel_hangupcause(who)));
 730                         ast_hangup(who);
 731                         channel->owner = NULL;
 732                         continue;
 733                 }
 734
 735                 /* Process the frame */
 736                 if (chan)
 737                         handle_frame(dial, channel, fr, chan);
 738                 else
 739                         handle_frame_ownerless(dial, channel, fr);
 740
 741                 /* Free the received frame and start all over */
 742                 ast_frfree(fr);
 743         }
 744
 745         /* Do post-processing from loop */
 746         if (dial->state == AST_DIAL_RESULT_ANSWERED) {
 747                 /* Hangup everything except that which answered */
 748                 AST_LIST_LOCK(&dial->channels);
 749                 AST_LIST_TRAVERSE(&dial->channels, channel, list) {
 750                         if (!channel->owner || channel->owner == who)
 751                                 continue;
 752                         if (chan)
 753                                 ast_poll_channel_del(chan, channel->owner);
 754                         ast_channel_publish_dial(chan, channel->owner, channel->device, "CANCEL");
 755                         ast_hangup(channel->owner);
 756                         channel->owner = NULL;
 757                 }
 758                 AST_LIST_UNLOCK(&dial->channels);
 759                 /* If ANSWER_EXEC is enabled as an option, execute application on answered channel */
 760                 if ((channel = find_relative_dial_channel(dial, who)) && (answer_exec = FIND_RELATIVE_OPTION(dial, channel, AST_DIAL_OPTION_ANSWER_EXEC))) {
 761                         channel->is_running_app = 1;
 762                         answer_exec_run(dial, channel, answer_exec->app, answer_exec->args);
 763                         channel->is_running_app = 0;
 764                 }
 765
 766                 if (chan && dial->options[AST_DIAL_OPTION_MUSIC] &&
 767                         !ast_strlen_zero(dial->options[AST_DIAL_OPTION_MUSIC])) {
 768                         ast_moh_stop(chan);
 769                 }
 770         } else if (dial->state == AST_DIAL_RESULT_HANGUP) {
 771                 /* Hangup everything */
 772                 AST_LIST_LOCK(&dial->channels);
 773                 AST_LIST_TRAVERSE(&dial->channels, channel, list) {
 774                         if (!channel->owner)
 775                                 continue;
 776                         if (chan)
 777                                 ast_poll_channel_del(chan, channel->owner);
 778                         ast_channel_publish_dial(chan, channel->owner, channel->device, "CANCEL");
 779                         ast_hangup(channel->owner);
 780                         channel->owner = NULL;
 781                 }
 782                 AST_LIST_UNLOCK(&dial->channels);
 783         }
 784
 785         return dial->state;
 786 }
 787
 788 /*! \brief Dial async thread function */
 789 static void *async_dial(void *data)
 790 {
 791         struct ast_dial *dial = data;
 792         if (dial->callid) {
 793                 ast_callid_threadassoc_add(dial->callid);
 794         }
 795
 796         /* This is really really simple... we basically pass monitor_dial a NULL owner and it changes it's behavior */
 797         monitor_dial(dial, NULL);
 798
 799         return NULL;
 800 }
 801
 802 /*! \brief Execute dialing synchronously or asynchronously
 803  * \note Dials channels in a dial structure.
 804  * \return Returns dial result code. (TRYING/INVALID/FAILED/ANSWERED/TIMEOUT/UNANSWERED).
 805  */
 806 enum ast_dial_result ast_dial_run(struct ast_dial *dial, struct ast_channel *chan, int async)
 807 {
 808         enum ast_dial_result res = AST_DIAL_RESULT_TRYING;
 809
 810         /* Ensure required arguments are passed */
 811         if (!dial) {
 812                 ast_debug(1, "invalid #1\n");
 813                 return AST_DIAL_RESULT_INVALID;
 814         }
 815
 816         /* If there are no channels to dial we can't very well try to dial them */
 817         if (AST_LIST_EMPTY(&dial->channels)) {
 818                 ast_debug(1, "invalid #2\n");
 819                 return AST_DIAL_RESULT_INVALID;
 820         }
 821
 822         /* Dial each requested channel */
 823         if (!begin_dial(dial, chan, async))
 824                 return AST_DIAL_RESULT_FAILED;
 825
 826         /* If we are running async spawn a thread and send it away... otherwise block here */
 827         if (async) {
 828                 /* reference be released at dial destruction if it isn't NULL */
 829                 dial->callid = ast_read_threadstorage_callid();
 830                 dial->state = AST_DIAL_RESULT_TRYING;
 831                 /* Try to create a thread */
 832                 if (ast_pthread_create(&dial->thread, NULL, async_dial, dial)) {
 833                         /* Failed to create the thread - hangup all dialed channels and return failed */
 834                         ast_dial_hangup(dial);
 835                         res = AST_DIAL_RESULT_FAILED;
 836                 }
 837         } else {
 838                 res = monitor_dial(dial, chan);
 839         }
 840
 841         return res;
 842 }
 843
 844 /*! \brief Return channel that answered
 845  * \note Returns the Asterisk channel that answered
 846  * \param dial Dialing structure
 847  */
 848 struct ast_channel *ast_dial_answered(struct ast_dial *dial)
 849 {
 850         if (!dial)
 851                 return NULL;
 852
 853         return ((dial->state == AST_DIAL_RESULT_ANSWERED) ? AST_LIST_FIRST(&dial->channels)->owner : NULL);
 854 }
 855
 856 /*! \brief Steal the channel that answered
 857  * \note Returns the Asterisk channel that answered and removes it from the dialing structure
 858  * \param dial Dialing structure
 859  */
 860 struct ast_channel *ast_dial_answered_steal(struct ast_dial *dial)
 861 {
 862         struct ast_channel *chan = NULL;
 863
 864         if (!dial)
 865                 return NULL;
 866
 867         if (dial->state == AST_DIAL_RESULT_ANSWERED) {
 868                 chan = AST_LIST_FIRST(&dial->channels)->owner;
 869                 AST_LIST_FIRST(&dial->channels)->owner = NULL;
 870         }
 871
 872         return chan;
 873 }
 874
 875 /*! \brief Return state of dial
 876  * \note Returns the state of the dial attempt
 877  * \param dial Dialing structure
 878  */
 879 enum ast_dial_result ast_dial_state(struct ast_dial *dial)
 880 {
 881         return dial->state;
 882 }
 883
 884 /*! \brief Cancel async thread
 885  * \note Cancel a running async thread
 886  * \param dial Dialing structure
 887  */
 888 enum ast_dial_result ast_dial_join(struct ast_dial *dial)
 889 {
 890         pthread_t thread;
 891
 892         /* If the dial structure is not running in async, return failed */
 893         if (dial->thread == AST_PTHREADT_NULL)
 894                 return AST_DIAL_RESULT_FAILED;
 895
 896         /* Record thread */
 897         thread = dial->thread;
 898
 899         /* Boom, commence locking */
 900         ast_mutex_lock(&dial->lock);
 901
 902         /* Stop the thread */
 903         dial->thread = AST_PTHREADT_STOP;
 904
 905         /* If the answered channel is running an application we have to soft hangup it, can't just poke the thread */
 906         AST_LIST_LOCK(&dial->channels);
 907         if (AST_LIST_FIRST(&dial->channels)->is_running_app) {
 908                 struct ast_channel *chan = AST_LIST_FIRST(&dial->channels)->owner;
 909                 if (chan) {
 910                         ast_channel_lock(chan);
 911                         ast_softhangup(chan, AST_SOFTHANGUP_EXPLICIT);
 912                         ast_channel_unlock(chan);
 913                 }
 914         } else {
 915                 /* Now we signal it with SIGURG so it will break out of it's waitfor */
 916                 pthread_kill(thread, SIGURG);
 917         }
 918         AST_LIST_UNLOCK(&dial->channels);
 919
 920         /* Yay done with it */
 921         ast_mutex_unlock(&dial->lock);
 922
 923         /* Finally wait for the thread to exit */
 924         pthread_join(thread, NULL);
 925
 926         /* Yay thread is all gone */
 927         dial->thread = AST_PTHREADT_NULL;
 928
 929         return dial->state;
 930 }
 931
 932 /*! \brief Hangup channels
 933  * \note Hangup all active channels
 934  * \param dial Dialing structure
 935  */
 936 void ast_dial_hangup(struct ast_dial *dial)
 937 {
 938         struct ast_dial_channel *channel = NULL;
 939
 940         if (!dial)
 941                 return;
 942
 943         AST_LIST_LOCK(&dial->channels);
 944         AST_LIST_TRAVERSE(&dial->channels, channel, list) {
 945                 ast_hangup(channel->owner);
 946                 channel->owner = NULL;
 947         }
 948         AST_LIST_UNLOCK(&dial->channels);
 949
 950         return;
 951 }
 952
 953 /*! \brief Destroys a dialing structure
 954  * \note Destroys (free's) the given ast_dial structure
 955  * \param dial Dialing structure to free
 956  * \return Returns 0 on success, -1 on failure
 957  */
 958 int ast_dial_destroy(struct ast_dial *dial)
 959 {
 960         int i = 0;
 961         struct ast_dial_channel *channel = NULL;
 962
 963         if (!dial)
 964                 return -1;
 965
 966         /* Hangup and deallocate all the dialed channels */
 967         AST_LIST_LOCK(&dial->channels);
 968         AST_LIST_TRAVERSE_SAFE_BEGIN(&dial->channels, channel, list) {
 969                 /* Disable any enabled options */
 970                 for (i = 0; i < AST_DIAL_OPTION_MAX; i++) {
 971                         if (!channel->options[i])
 972                                 continue;
 973                         if (option_types[i].disable)
 974                                 option_types[i].disable(channel->options[i]);
 975                         channel->options[i] = NULL;
 976                 }
 977
 978                 /* Hang up channel if need be */
 979                 ast_hangup(channel->owner);
 980                 channel->owner = NULL;
 981
 982                 /* Free structure */
 983                 ast_free(channel->tech);
 984                 ast_free(channel->device);
 985                 AST_LIST_REMOVE_CURRENT(list);
 986                 ast_free(channel);
 987         }
 988         AST_LIST_TRAVERSE_SAFE_END;
 989         AST_LIST_UNLOCK(&dial->channels);
 990
 991         /* Disable any enabled options globally */
 992         for (i = 0; i < AST_DIAL_OPTION_MAX; i++) {
 993                 if (!dial->options[i])
 994                         continue;
 995                 if (option_types[i].disable)
 996                         option_types[i].disable(dial->options[i]);
 997                 dial->options[i] = NULL;
 998         }
 999
1000         /* Lock be gone! */
1001         ast_mutex_destroy(&dial->lock);
1002
1003         /* Get rid of the reference to the ast_callid */
1004         if (dial->callid) {
1005                 ast_callid_unref(dial->callid);
1006         }
1007
1008         /* Free structure */
1009         ast_free(dial);
1010
1011         return 0;
1012 }
1013
1014 /*! \brief Enables an option globally
1015  * \param dial Dial structure to enable option on
1016  * \param option Option to enable
1017  * \param data Data to pass to this option (not always needed)
1018  * \return Returns 0 on success, -1 on failure
1019  */
1020 int ast_dial_option_global_enable(struct ast_dial *dial, enum ast_dial_option option, void *data)
1021 {
1022         /* If the option is already enabled, return failure */
1023         if (dial->options[option])
1024                 return -1;
1025
1026         /* Execute enable callback if it exists, if not simply make sure the value is set */
1027         if (option_types[option].enable)
1028                 dial->options[option] = option_types[option].enable(data);
1029         else
1030                 dial->options[option] = (void*)1;
1031
1032         return 0;
1033 }
1034
1035 /*! \brief Helper function for finding a channel in a dial structure based on number
1036  */
1037 static struct ast_dial_channel *find_dial_channel(struct ast_dial *dial, int num)
1038 {
1039         struct ast_dial_channel *channel = AST_LIST_LAST(&dial->channels);
1040
1041         /* We can try to predict programmer behavior, the last channel they added is probably the one they wanted to modify */
1042         if (channel->num == num)
1043                 return channel;
1044
1045         /* Hrm not at the end... looking through the list it is! */
1046         AST_LIST_LOCK(&dial->channels);
1047         AST_LIST_TRAVERSE(&dial->channels, channel, list) {
1048                 if (channel->num == num)
1049                         break;
1050         }
1051         AST_LIST_UNLOCK(&dial->channels);
1052
1053         return channel;
1054 }
1055
1056 /*! \brief Enables an option per channel
1057  * \param dial Dial structure
1058  * \param num Channel number to enable option on
1059  * \param option Option to enable
1060  * \param data Data to pass to this option (not always needed)
1061  * \return Returns 0 on success, -1 on failure
1062  */
1063 int ast_dial_option_enable(struct ast_dial *dial, int num, enum ast_dial_option option, void *data)
1064 {
1065         struct ast_dial_channel *channel = NULL;
1066
1067         /* Ensure we have required arguments */
1068         if (!dial || AST_LIST_EMPTY(&dial->channels))
1069                 return -1;
1070
1071         if (!(channel = find_dial_channel(dial, num)))
1072                 return -1;
1073
1074         /* If the option is already enabled, return failure */
1075         if (channel->options[option])
1076                 return -1;
1077
1078         /* Execute enable callback if it exists, if not simply make sure the value is set */
1079         if (option_types[option].enable)
1080                 channel->options[option] = option_types[option].enable(data);
1081         else
1082                 channel->options[option] = (void*)1;
1083
1084         return 0;
1085 }
1086
1087 /*! \brief Disables an option globally
1088  * \param dial Dial structure to disable option on
1089  * \param option Option to disable
1090  * \return Returns 0 on success, -1 on failure
1091  */
1092 int ast_dial_option_global_disable(struct ast_dial *dial, enum ast_dial_option option)
1093 {
1094         /* If the option is not enabled, return failure */
1095         if (!dial->options[option]) {
1096                 return -1;
1097         }
1098
1099         /* Execute callback of option to disable if it exists */
1100         if (option_types[option].disable)
1101                 option_types[option].disable(dial->options[option]);
1102
1103         /* Finally disable option on the structure */
1104         dial->options[option] = NULL;
1105
1106         return 0;
1107 }
1108
1109 /*! \brief Disables an option per channel
1110  * \param dial Dial structure
1111  * \param num Channel number to disable option on
1112  * \param option Option to disable
1113  * \return Returns 0 on success, -1 on failure
1114  */
1115 int ast_dial_option_disable(struct ast_dial *dial, int num, enum ast_dial_option option)
1116 {
1117         struct ast_dial_channel *channel = NULL;
1118
1119         /* Ensure we have required arguments */
1120         if (!dial || AST_LIST_EMPTY(&dial->channels))
1121                 return -1;
1122
1123         if (!(channel = find_dial_channel(dial, num)))
1124                 return -1;
1125
1126         /* If the option is not enabled, return failure */
1127         if (!channel->options[option])
1128                 return -1;
1129
1130         /* Execute callback of option to disable it if it exists */
1131         if (option_types[option].disable)
1132                 option_types[option].disable(channel->options[option]);
1133
1134         /* Finally disable the option on the structure */
1135         channel->options[option] = NULL;
1136
1137         return 0;
1138 }
1139
1140 int ast_dial_reason(struct ast_dial *dial, int num)
1141 {
1142         struct ast_dial_channel *channel;
1143
1144         if (!dial || AST_LIST_EMPTY(&dial->channels) || !(channel = find_dial_channel(dial, num))) {
1145                 return -1;
1146         }
1147
1148         return channel->cause;
1149 }
1150
1151 struct ast_channel *ast_dial_get_channel(struct ast_dial *dial, int num)
1152 {
1153         struct ast_dial_channel *channel;
1154
1155         if (!dial || AST_LIST_EMPTY(&dial->channels) || !(channel = find_dial_channel(dial, num))) {
1156                 return NULL;
1157         }
1158
1159         return channel->owner;
1160 }
1161
1162 void ast_dial_set_state_callback(struct ast_dial *dial, ast_dial_state_callback callback)
1163 {
1164         dial->state_callback = callback;
1165 }
1166
1167 void ast_dial_set_user_data(struct ast_dial *dial, void *user_data)
1168 {
1169         dial->user_data = user_data;
1170 }
1171
1172 void *ast_dial_get_user_data(struct ast_dial *dial)
1173 {
1174         return dial->user_data;
1175 }
1176
1177 /*! \brief Set the maximum time (globally) allowed for trying to ring phones
1178  * \param dial The dial structure to apply the time limit to
1179  * \param timeout Maximum time allowed
1180  * \return nothing
1181  */
1182 void ast_dial_set_global_timeout(struct ast_dial *dial, int timeout)
1183 {
1184         dial->timeout = timeout;
1185
1186         if (dial->timeout > 0 && (dial->actual_timeout > dial->timeout || dial->actual_timeout == -1))
1187                 dial->actual_timeout = dial->timeout;
1188
1189         return;
1190 }
1191
1192 /*! \brief Set the maximum time (per channel) allowed for trying to ring the phone
1193  * \param dial The dial structure the channel belongs to
1194  * \param num Channel number to set timeout on
1195  * \param timeout Maximum time allowed
1196  * \return nothing
1197  */
1198 void ast_dial_set_timeout(struct ast_dial *dial, int num, int timeout)
1199 {
1200         struct ast_dial_channel *channel = NULL;
1201
1202         if (!(channel = find_dial_channel(dial, num)))
1203                 return;
1204
1205         channel->timeout = timeout;
1206
1207         if (channel->timeout > 0 && (dial->actual_timeout > channel->timeout || dial->actual_timeout == -1))
1208                 dial->actual_timeout = channel->timeout;
1209
1210         return;
1211 }