res/res_parking.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * Routines implementing call parking
   5  *
   6  * Copyright (C) 1999, Mark Spencer
   7  *
   8  * Mark Spencer <markster@linux-support.net>
   9  *
  10  * This program is free software, distributed under the terms of
  11  * the GNU General Public License
  12  */
  13
  14 #include <asterisk/lock.h>
  15 #include <asterisk/file.h>
  16 #include <asterisk/logger.h>
  17 #include <asterisk/channel.h>
  18 #include <asterisk/pbx.h>
  19 #include <asterisk/options.h>
  20 #include <asterisk/module.h>
  21 #include <asterisk/translate.h>
  22 #include <asterisk/say.h>
  23 #include <asterisk/channel_pvt.h>
  24 #include <asterisk/parking.h>
  25 #include <asterisk/musiconhold.h>
  26 #include <asterisk/config.h>
  27 #include <asterisk/cli.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <unistd.h>
  31 #include <string.h>
  32 #include <stdlib.h>
  33 #include <stdio.h>
  34 #include <sys/time.h>
  35 #include <sys/signal.h>
  36 #include <netinet/in.h>
  37
  38 #include <pthread.h>
  39
  40 #define DEFAULT_PARK_TIME 45000
  41
  42 static char *parkedcall = "ParkedCall";
  43
  44 /* No more than 45 seconds parked before you do something with them */
  45 static int parkingtime = DEFAULT_PARK_TIME;
  46
  47 /* Context for which parking is made accessible */
  48 static char parking_con[AST_MAX_EXTENSION] = "parkedcalls";
  49
  50 /* Extension you type to park the call */
  51 static char parking_ext[AST_MAX_EXTENSION] = "700";
  52
  53 static char pickup_ext[AST_MAX_EXTENSION] = "*8";
  54
  55 /* First available extension for parking */
  56 static int parking_start = 701;
  57
  58 /* Last available extension for parking */
  59 static int parking_stop = 750;
  60
  61 /* Registrar for operations */
  62 static char *registrar = "res_parking";
  63
  64 static char *synopsis = "Answer a parked call";
  65
  66 static char *descrip = "ParkedCall(exten):"
  67 "Used to connect to a parked call.  This Application is always\n"
  68 "registered internally and does not need to be explicitly added\n"
  69 "into the dialplan, although you should include the 'parkedcalls'\n"
  70 "context.\n";
  71
  72 struct parkeduser {
  73         struct ast_channel *chan;
  74         struct timeval start;
  75         int parkingnum;
  76         /* Where to go if our parking time expires */
  77         char context[AST_MAX_EXTENSION];
  78         char exten[AST_MAX_EXTENSION];
  79         int priority;
  80         int parkingtime;
  81         struct parkeduser *next;
  82 };
  83
  84 static struct parkeduser *parkinglot;
  85
  86 static ast_mutex_t parking_lock = AST_MUTEX_INITIALIZER;
  87
  88 static pthread_t parking_thread;
  89
  90 STANDARD_LOCAL_USER;
  91
  92 LOCAL_USER_DECL;
  93
  94 char *ast_parking_ext(void)
  95 {
  96         return parking_ext;
  97 }
  98
  99 char *ast_pickup_ext(void)
 100 {
 101         return pickup_ext;
 102 }
 103
 104 int ast_park_call(struct ast_channel *chan, struct ast_channel *peer, int timeout, int *extout)
 105 {
 106         /* We put the user in the parking list, then wake up the parking thread to be sure it looks
 107            after these channels too */
 108         struct parkeduser *pu, *cur;
 109         int x;
 110         pu = malloc(sizeof(struct parkeduser));
 111         if (pu) {
 112                 ast_mutex_lock(&parking_lock);
 113                 for (x=parking_start;x<=parking_stop;x++) {
 114                         cur = parkinglot;
 115                         while(cur) {
 116                                 if (cur->parkingnum == x)
 117                                         break;
 118                                 cur = cur->next;
 119                         }
 120                         if (!cur)
 121                                 break;
 122                 }
 123                 if (x <= parking_stop) {
 124                         chan->appl = "Parked Call";
 125                         chan->data = NULL;
 126
 127                         pu->chan = chan;
 128                         /* Start music on hold */
 129                         ast_moh_start(pu->chan, NULL);
 130                         gettimeofday(&pu->start, NULL);
 131                         pu->parkingnum = x;
 132                         if (timeout > 0)
 133                                 pu->parkingtime = timeout;
 134                         else
 135                                 pu->parkingtime = parkingtime;
 136                         if (extout)
 137                                 *extout = x;
 138                         /* Remember what had been dialed, so that if the parking
 139                            expires, we try to come back to the same place */
 140                         if (strlen(chan->macrocontext))
 141                                 strncpy(pu->context, chan->macrocontext, sizeof(pu->context)-1);
 142                         else
 143                                 strncpy(pu->context, chan->context, sizeof(pu->context)-1);
 144                         if (strlen(chan->macroexten))
 145                                 strncpy(pu->exten, chan->macroexten, sizeof(pu->exten)-1);
 146                         else
 147                                 strncpy(pu->exten, chan->exten, sizeof(pu->exten)-1);
 148                         if (chan->macropriority)
 149                                 pu->priority = chan->macropriority;
 150                         else
 151                                 pu->priority = chan->priority;
 152                         pu->next = parkinglot;
 153                         parkinglot = pu;
 154                         ast_mutex_unlock(&parking_lock);
 155                         /* Wake up the (presumably select()ing) thread */
 156                         pthread_kill(parking_thread, SIGURG);
 157                         if (option_verbose > 1)
 158                                 ast_verbose(VERBOSE_PREFIX_2 "Parked %s on %d\n", pu->chan->name, pu->parkingnum);
 159                         if (peer)
 160                                 ast_say_digits(peer, pu->parkingnum, "", peer->language);
 161                         return 0;
 162                 } else {
 163                         ast_log(LOG_WARNING, "No more parking spaces\n");
 164                         free(pu);
 165                         ast_mutex_unlock(&parking_lock);
 166                         return -1;
 167                 }
 168         } else {
 169                 ast_log(LOG_WARNING, "Out of memory\n");
 170                 return -1;
 171         }
 172         return 0;
 173 }
 174
 175 int ast_masq_park_call(struct ast_channel *rchan, struct ast_channel *peer, int timeout, int *extout)
 176 {
 177         struct ast_channel *chan;
 178         struct ast_frame *f;
 179         /* Make a new, fake channel that we'll use to masquerade in the real one */
 180         chan = ast_channel_alloc(0);
 181         if (chan) {
 182                 /* Let us keep track of the channel name */
 183                 snprintf(chan->name, sizeof (chan->name), "Parked/%s",rchan->name);
 184                 /* Make formats okay */
 185                 chan->readformat = rchan->readformat;
 186                 chan->writeformat = rchan->writeformat;
 187                 ast_channel_masquerade(chan, rchan);
 188                 /* Setup the extensions and such */
 189                 strncpy(chan->context, rchan->context, sizeof(chan->context) - 1);
 190                 strncpy(chan->exten, rchan->exten, sizeof(chan->exten) - 1);
 191                 chan->priority = rchan->priority;
 192                 /* Make the masq execute */
 193                 f = ast_read(chan);
 194                 if (f)
 195                         ast_frfree(f);
 196                 ast_park_call(chan, peer, timeout, extout);
 197         } else {
 198                 ast_log(LOG_WARNING, "Unable to create parked channel\n");
 199                 return -1;
 200         }
 201         return 0;
 202 }
 203
 204 int ast_bridge_call(struct ast_channel *chan, struct ast_channel *peer, int allowredirect_in, int allowredirect_out, int allowdisconnect)
 205 {
 206         /* Copy voice back and forth between the two channels.  Give the peer
 207            the ability to transfer calls with '#<extension' syntax. */
 208         int len;
 209         struct ast_frame *f;
 210         struct ast_channel *who;
 211         char newext[256], *ptr;
 212         int res;
 213         struct ast_option_header *aoh;
 214         struct ast_channel *transferer;
 215         struct ast_channel *transferee;
 216   char *transferer_real_context;
 217
 218         /* Answer if need be */
 219         if (ast_answer(chan))
 220                 return -1;
 221         peer->appl = "Bridged Call";
 222         peer->data = chan->name;
 223         for (;;) {
 224                 res = ast_channel_bridge(chan, peer, (allowdisconnect||allowredirect_out ? AST_BRIDGE_DTMF_CHANNEL_0 : 0) + (allowredirect_in ? AST_BRIDGE_DTMF_CHANNEL_1 : 0), &f, &who);
 225                 if (res < 0) {
 226                         ast_log(LOG_WARNING, "Bridge failed on channels %s and %s\n", chan->name, peer->name);
 227                         return -1;
 228                 }
 229
 230                 if (!f || ((f->frametype == AST_FRAME_CONTROL) && ((f->subclass == AST_CONTROL_HANGUP) || (f->subclass == AST_CONTROL_BUSY) ||
 231                         (f->subclass == AST_CONTROL_CONGESTION)))) {
 232                                 res = -1;
 233                                 break;
 234                 }
 235                 if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_RINGING)) {
 236                         if (who == chan)
 237                                 ast_indicate(peer, AST_CONTROL_RINGING);
 238                         else
 239                                 ast_indicate(chan, AST_CONTROL_RINGING);
 240                 }
 241                 if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == -1)) {
 242                         if (who == chan)
 243                                 ast_indicate(peer, -1);
 244                         else
 245                                 ast_indicate(chan, -1);
 246                 }
 247                 if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_OPTION)) {
 248                         aoh = f->data;
 249                         /* Forward option Requests */
 250                         if (aoh && (aoh->flag == AST_OPTION_FLAG_REQUEST)) {
 251                                 if (who == chan)
 252                                         ast_channel_setoption(peer, ntohs(aoh->option), aoh->data, f->datalen - sizeof(struct ast_option_header), 0);
 253                                 else
 254                                         ast_channel_setoption(chan, ntohs(aoh->option), aoh->data, f->datalen - sizeof(struct ast_option_header), 0);
 255                         }
 256                 }
 257             if (f && (f->frametype == AST_FRAME_DTMF) && (who == chan) && allowdisconnect &&
 258                      (f->subclass == '*')) {
 259                 if (option_verbose > 3)
 260                         ast_verbose(VERBOSE_PREFIX_3 "User hit %c to disconnect call.\n", f->subclass);
 261                         res = -1;
 262                         break;
 263
 264                         }
 265
 266                 if ((f->frametype == AST_FRAME_DTMF) &&
 267                         ((allowredirect_in && who == peer) || (allowredirect_out && who == chan)) &&
 268                         (f->subclass == '#')) {
 269                                 if(allowredirect_in &&  who == peer) {
 270                                         transferer = peer;
 271                                         transferee = chan;
 272                                 }
 273                                 else {
 274                                         transferer = chan;
 275                                         transferee = peer;
 276                                 }
 277
 278                                 /* Use the non-macro context to transfer the call */
 279                                 if(strlen(transferer->macrocontext))
 280                                         transferer_real_context=transferer->macrocontext;
 281                                 else
 282                                         transferer_real_context=transferer->context;
 283
 284                                 /* Start autoservice on chan while we talk
 285                                    to the originator */
 286                                 ast_autoservice_start(transferee);
 287                                 ast_moh_start(transferee, NULL);
 288
 289                                 memset(newext, 0, sizeof(newext));
 290                                 ptr = newext;
 291
 292                                         /* Transfer */
 293                                 if ((res=ast_streamfile(transferer, "pbx-transfer", transferer->language))) {
 294                                         ast_moh_stop(transferee);
 295                                         ast_autoservice_stop(transferee);
 296                                         break;
 297                                 }
 298                                 if ((res=ast_waitstream(transferer, AST_DIGIT_ANY)) < 0) {
 299                                         ast_moh_stop(transferee);
 300                                         ast_autoservice_stop(transferee);
 301                                         break;
 302                                 }
 303                                 ast_stopstream(transferer);
 304                                 if (res > 0) {
 305                                         /* If they've typed a digit already, handle it */
 306                                         newext[0] = res;
 307                                         ptr++;
 308                                         len --;
 309                                 }
 310                                 res = 0;
 311                                 while(strlen(newext) < sizeof(newext) - 1) {
 312                                         res = ast_waitfordigit(transferer, 3000);
 313                                         if (res < 1)
 314                                                 break;
 315                                         if (res == '#')
 316                                                 break;
 317                                         *(ptr++) = res;
 318                                         if (!ast_matchmore_extension(transferer, transferer_real_context
 319                                                                 , newext, 1, transferer->callerid)) {
 320                                                 break;
 321                                         }
 322                                 }
 323
 324                                 if (res < 0) {
 325                                         ast_moh_stop(transferee);
 326                                         ast_autoservice_stop(transferee);
 327                                         break;
 328                                 }
 329                                 if (!strcmp(newext, ast_parking_ext())) {
 330                                         ast_moh_stop(transferee);
 331
 332                                         if (ast_autoservice_stop(transferee))
 333                                                 res = -1;
 334                                         else if (!ast_park_call(transferee, transferer, 0, NULL)) {
 335                                                 /* We return non-zero, but tell the PBX not to hang the channel when
 336                                                    the thread dies -- We have to be careful now though.  We are responsible for
 337                                                    hanging up the channel, else it will never be hung up! */
 338
 339                                                 if(transferer==peer)
 340                                                         res=AST_PBX_KEEPALIVE;
 341                                                 else
 342                                                         res=AST_PBX_NO_HANGUP_PEER;
 343                                                 break;
 344                                         } else {
 345                                                 ast_log(LOG_WARNING, "Unable to park call %s\n", transferee->name);
 346                                         }
 347                                         /* XXX Maybe we should have another message here instead of invalid extension XXX */
 348                                 } else if (ast_exists_extension(transferee, transferer_real_context, newext, 1, transferer->callerid)) {
 349                                         ast_moh_stop(transferee);
 350                                         res=ast_autoservice_stop(transferee);
 351                                         if (!transferee->pbx) {
 352                                                 /* Doh!  Use our handy async_goto funcitons */
 353                                                 if (option_verbose > 2)
 354                                                         ast_verbose(VERBOSE_PREFIX_3 "Transferring %s to '%s' (context %s) priority 1\n"
 355                                                                 ,transferee->name, newext, transferer_real_context);
 356                                                 if (ast_async_goto(transferee, transferer_real_context, newext, 1, 1))
 357                                                         ast_log(LOG_WARNING, "Async goto fialed :(\n");
 358                                                 res = -1;
 359                                         } else {
 360                                                 /* Set the channel's new extension, since it exists, using transferer context */
 361                                                 strncpy(transferee->exten, newext, sizeof(transferee->exten)-1);
 362                                                 strncpy(transferee->context, transferer_real_context, sizeof(transferee->context)-1);
 363                                                 transferee->priority = 0;
 364                                                 ast_frfree(f);
 365                                         }
 366                                         break;
 367                                 } else {
 368                                         if (option_verbose > 2)
 369                                                 ast_verbose(VERBOSE_PREFIX_3 "Unable to find extension '%s' in context '%s'\n", newext, transferer_real_context);
 370                                 }
 371                                 res = ast_streamfile(transferer, "pbx-invalid", transferee->language);
 372                                 if (res) {
 373                                         ast_moh_stop(transferee);
 374                                         ast_autoservice_stop(transferee);
 375                                         break;
 376                                 }
 377                                 res = ast_waitstream(transferer, AST_DIGIT_ANY);
 378                                 ast_stopstream(transferer);
 379                                 ast_moh_stop(transferee);
 380                                 res = ast_autoservice_stop(transferee);
 381                                 if (res) {
 382                                         if (option_verbose > 1)
 383                                                 ast_verbose(VERBOSE_PREFIX_2 "Hungup during autoservice stop on '%s'\n", transferee->name);
 384                                 }
 385                         } else {
 386             if (f && (f->frametype == AST_FRAME_DTMF)) {
 387                   if (who == peer)
 388                         ast_write(chan, f);
 389                   else
 390                         ast_write(peer, f);
 391             }
 392 #if 1
 393                                 ast_log(LOG_DEBUG, "Read from %s (%d,%d)\n", who->name, f->frametype, f->subclass);
 394 #endif
 395                         }
 396          if (f)
 397                ast_frfree(f);
 398         }
 399         return res;
 400 }
 401
 402 static void *do_parking_thread(void *ignore)
 403 {
 404         int ms, tms, max;
 405         struct parkeduser *pu, *pl, *pt = NULL;
 406         struct timeval tv;
 407         struct ast_frame *f;
 408         int x;
 409         fd_set rfds, efds;
 410         fd_set nrfds, nefds;
 411         FD_ZERO(&rfds);
 412         FD_ZERO(&efds);
 413         for (;;) {
 414                 ms = -1;
 415                 max = -1;
 416                 ast_mutex_lock(&parking_lock);
 417                 pl = NULL;
 418                 pu = parkinglot;
 419                 gettimeofday(&tv, NULL);
 420                 FD_ZERO(&nrfds);
 421                 FD_ZERO(&nefds);
 422                 while(pu) {
 423                         tms = (tv.tv_sec - pu->start.tv_sec) * 1000 + (tv.tv_usec - pu->start.tv_usec) / 1000;
 424                         if (tms > pu->parkingtime) {
 425                                 /* They've been waiting too long, send them back to where they came.  Theoretically they
 426                                    should have their original extensions and such, but we copy to be on the safe side */
 427                                 strncpy(pu->chan->exten, pu->exten, sizeof(pu->chan->exten)-1);
 428                                 strncpy(pu->chan->context, pu->context, sizeof(pu->chan->context)-1);
 429                                 pu->chan->priority = pu->priority;
 430                                 /* Stop music on hold */
 431                                 ast_moh_stop(pu->chan);
 432                                 /* Start up the PBX, or hang them up */
 433                                 if (ast_pbx_start(pu->chan))  {
 434                                         ast_log(LOG_WARNING, "Unable to restart the PBX for user on '%s', hanging them up...\n", pu->chan->name);
 435                                         ast_hangup(pu->chan);
 436                                 }
 437                                 /* And take them out of the parking lot */
 438                                 if (pl)
 439                                         pl->next = pu->next;
 440                                 else
 441                                         parkinglot = pu->next;
 442                                 pt = pu;
 443                                 pu = pu->next;
 444                                 free(pt);
 445                         } else {
 446                                 for (x=0;x<AST_MAX_FDS;x++) {
 447                                         if ((pu->chan->fds[x] > -1) && (FD_ISSET(pu->chan->fds[x], &rfds) || FD_ISSET(pu->chan->fds[x], &efds))) {
 448                                                 if (FD_ISSET(pu->chan->fds[x], &efds))
 449                                                         pu->chan->exception = 1;
 450                                                 pu->chan->fdno = x;
 451                                                 /* See if they need servicing */
 452                                                 f = ast_read(pu->chan);
 453                                                 if (!f || ((f->frametype == AST_FRAME_CONTROL) && (f->subclass ==  AST_CONTROL_HANGUP))) {
 454                                                         /* There's a problem, hang them up*/
 455                                                         if (option_verbose > 1)
 456                                                                 ast_verbose(VERBOSE_PREFIX_2 "%s got tired of being parked\n", pu->chan->name);
 457                                                         ast_hangup(pu->chan);
 458                                                         /* And take them out of the parking lot */
 459                                                         if (pl)
 460                                                                 pl->next = pu->next;
 461                                                         else
 462                                                                 parkinglot = pu->next;
 463                                                         pt = pu;
 464                                                         pu = pu->next;
 465                                                         free(pt);
 466                                                         break;
 467                                                 } else {
 468                                                         /* XXX Maybe we could do something with packets, like dial "0" for operator or something XXX */
 469                                                         ast_frfree(f);
 470                                                         goto std;       /* XXX Ick: jumping into an else statement??? XXX */
 471                                                 }
 472                                         }
 473                                 }
 474                                 if (x >= AST_MAX_FDS) {
 475 std:                                    for (x=0;x<AST_MAX_FDS;x++) {
 476                                                 /* Keep this one for next one */
 477                                                 if (pu->chan->fds[x] > -1) {
 478                                                         FD_SET(pu->chan->fds[x], &nrfds);
 479                                                         FD_SET(pu->chan->fds[x], &nefds);
 480                                                         if (pu->chan->fds[x] > max)
 481                                                                 max = pu->chan->fds[x];
 482                                                 }
 483                                         }
 484                                         /* Keep track of our longest wait */
 485                                         if ((tms < ms) || (ms < 0))
 486                                                 ms = tms;
 487                                         pl = pu;
 488                                         pu = pu->next;
 489                                 }
 490                         }
 491                 }
 492                 ast_mutex_unlock(&parking_lock);
 493                 rfds = nrfds;
 494                 efds = nefds;
 495                 tv.tv_sec = ms / 1000;
 496                 tv.tv_usec = (ms % 1000) * 1000;
 497                 /* Wait for something to happen */
 498                 ast_select(max + 1, &rfds, NULL, &efds, (ms > -1) ? &tv : NULL);
 499                 pthread_testcancel();
 500         }
 501         return NULL;    /* Never reached */
 502 }
 503
 504 static int park_exec(struct ast_channel *chan, void *data)
 505 {
 506         int res=0;
 507         struct localuser *u;
 508         struct ast_channel *peer=NULL;
 509         struct parkeduser *pu, *pl=NULL;
 510         int park;
 511         int dres;
 512         if (!data) {
 513                 ast_log(LOG_WARNING, "Park requires an argument (extension number)\n");
 514                 return -1;
 515         }
 516         LOCAL_USER_ADD(u);
 517         park = atoi((char *)data);
 518         ast_mutex_lock(&parking_lock);
 519         pu = parkinglot;
 520         while(pu) {
 521                 if (pu->parkingnum == park) {
 522                         if (pl)
 523                                 pl->next = pu->next;
 524                         else
 525                                 parkinglot = pu->next;
 526                         break;
 527                 }
 528                 pl = pu;
 529                 pu = pu->next;
 530         }
 531         ast_mutex_unlock(&parking_lock);
 532         if (pu) {
 533                 peer = pu->chan;
 534                 free(pu);
 535         }
 536         /* JK02: it helps to answer the channel if not already up */
 537         if (chan->_state != AST_STATE_UP) {
 538                 ast_answer(chan);
 539         }
 540
 541         if (peer) {
 542                 ast_moh_stop(peer);
 543                 res = ast_channel_make_compatible(chan, peer);
 544                 if (res < 0) {
 545                         ast_log(LOG_WARNING, "Could not make channels %s and %s compatible for bridge\n", chan->name, peer->name);
 546                         ast_hangup(peer);
 547                         return -1;
 548                 }
 549                 /* This runs sorta backwards, since we give the incoming channel control, as if it
 550                    were the person called. */
 551                 if (option_verbose > 2)
 552                         ast_verbose(VERBOSE_PREFIX_3 "Channel %s connected to parked call %d\n", chan->name, park);
 553                 res = ast_bridge_call(peer, chan, 1, 1, 0);
 554                 /* Simulate the PBX hanging up */
 555                 if (res != AST_PBX_KEEPALIVE)
 556                         ast_hangup(peer);
 557                 return -1;
 558         } else {
 559                 /* XXX Play a message XXX */
 560           dres = ast_streamfile(chan, "pbx-invalidpark", chan->language);
 561           if (!dres)
 562             dres = ast_waitstream(chan, "");
 563           else {
 564             ast_log(LOG_WARNING, "ast_streamfile of %s failed on %s\n", "pbx-invalidpark", chan->name);
 565             dres = 0;
 566           }
 567                 if (option_verbose > 2)
 568                         ast_verbose(VERBOSE_PREFIX_3 "Channel %s tried to talk to non-existant parked call %d\n", chan->name, park);
 569                 res = -1;
 570         }
 571         LOCAL_USER_REMOVE(u);
 572         return res;
 573 }
 574
 575 static int handle_parkedcalls(int fd, int argc, char *argv[])
 576 {
 577         struct parkeduser *cur;
 578
 579         ast_cli(fd, "%4s %25s (%-15s %-12s %-4s) %-6s \n", "Num", "Channel"
 580                 , "Context", "Extension", "Pri", "Timeout");
 581
 582         ast_mutex_lock(&parking_lock);
 583
 584         cur=parkinglot;
 585         while(cur) {
 586                 ast_cli(fd, "%4d %25s (%-15s %-12s %-4d) %6lds\n"
 587                         ,cur->parkingnum, cur->chan->name, cur->context, cur->exten
 588                         ,cur->priority, cur->start.tv_sec + (cur->parkingtime/1000) - time(NULL));
 589
 590                 cur = cur->next;
 591         }
 592
 593         ast_mutex_unlock(&parking_lock);
 594
 595         return RESULT_SUCCESS;
 596 }
 597
 598 static char showparked_help[] =
 599 "Usage: show parkedcalls\n"
 600 "       Lists currently parked calls.\n";
 601
 602 static struct ast_cli_entry showparked =
 603 { { "show", "parkedcalls", NULL }, handle_parkedcalls, "Lists parked calls", showparked_help };
 604
 605
 606 int load_module(void)
 607 {
 608         int res;
 609         int x;
 610         int start, end;
 611         struct ast_context *con;
 612         char exten[AST_MAX_EXTENSION];
 613         struct ast_config *cfg;
 614         struct ast_variable *var;
 615
 616         ast_cli_register(&showparked);
 617
 618         cfg = ast_load("parking.conf");
 619         if (cfg) {
 620                 var = ast_variable_browse(cfg, "general");
 621                 while(var) {
 622                         if (!strcasecmp(var->name, "parkext")) {
 623                                 strncpy(parking_ext, var->value, sizeof(parking_ext) - 1);
 624                         } else if (!strcasecmp(var->name, "context")) {
 625                                 strncpy(parking_con, var->value, sizeof(parking_con) - 1);
 626                         } else if (!strcasecmp(var->name, "parkingtime")) {
 627                                 if ((sscanf(var->value, "%d", &parkingtime) != 1) || (parkingtime < 1)) {
 628                                         ast_log(LOG_WARNING, "%s is not a valid parkingtime\n", var->value);
 629                                         parkingtime = DEFAULT_PARK_TIME;
 630                                 } else
 631                                         parkingtime = parkingtime * 1000;
 632                         } else if (!strcasecmp(var->name, "parkpos")) {
 633                                 if (sscanf(var->value, "%i-%i", &start, &end) != 2) {
 634                                         ast_log(LOG_WARNING, "Format for parking positions is a-b, where a and b are numbers at line %d of parking.conf\n", var->lineno);
 635                                 } else {
 636                                         parking_start = start;
 637                                         parking_stop = end;
 638                                 }
 639                         }
 640                         var = var->next;
 641                 }
 642                 ast_destroy(cfg);
 643         }
 644         con = ast_context_find(parking_con);
 645         if (!con) {
 646                 con = ast_context_create(NULL,parking_con, registrar);
 647                 if (!con) {
 648                         ast_log(LOG_ERROR, "Parking context '%s' does not exist and unable to create\n", parking_con);
 649                         return -1;
 650                 }
 651         }
 652         for(x=parking_start; x<=parking_stop;x++) {
 653                 snprintf(exten, sizeof(exten), "%d", x);
 654                 ast_add_extension2(con, 1, exten, 1, NULL, parkedcall, strdup(exten), free, registrar);
 655         }
 656         pthread_create(&parking_thread, NULL, do_parking_thread, NULL);
 657         res = ast_register_application(parkedcall, park_exec, synopsis, descrip);
 658         return res;
 659 }
 660
 661 int ast_pickup_call(struct ast_channel *chan)
 662 {
 663         struct ast_channel *cur;
 664         int res = -1;
 665         cur = ast_channel_walk(NULL);
 666         while(cur) {
 667                 if (!cur->pbx &&
 668                         (cur != chan) &&
 669                         (chan->pickupgroup & cur->callgroup) &&
 670                         ((cur->_state == AST_STATE_RINGING) ||
 671                          (cur->_state == AST_STATE_RING))) {
 672                                 break;
 673                 }
 674                 cur = ast_channel_walk(cur);
 675         }
 676         if (cur) {
 677                 ast_log(LOG_DEBUG, "Call pickup on chan '%s' by '%s'\n",cur->name, chan->name);
 678                 res = ast_answer(chan);
 679                 if (res)
 680                         ast_log(LOG_WARNING, "Unable to answer '%s'\n", chan->name);
 681                 res = ast_queue_control(chan, AST_CONTROL_ANSWER, 0);
 682                 if (res)
 683                         ast_log(LOG_WARNING, "Unable to queue answer on '%s'\n", chan->name);
 684                 res = ast_channel_masquerade(cur, chan);
 685                 if (res)
 686                         ast_log(LOG_WARNING, "Unable to masquerade '%s' into '%s'\n", chan->name, cur->name);           /* Done */
 687         } else  {
 688                 ast_log(LOG_DEBUG, "No call pickup possible...\n");
 689         }
 690         return res;
 691 }
 692
 693 unsigned int ast_get_group(char *s)
 694 {
 695         char *copy;
 696         char *piece;
 697         char *c=NULL;
 698         int start=0, finish=0,x;
 699         unsigned int group = 0;
 700         copy = ast_strdupa(s);
 701         if (!copy) {
 702                 ast_log(LOG_ERROR, "Out of memory\n");
 703                 return 0;
 704         }
 705         c = copy;
 706
 707         while((piece = strsep(&c, ","))) {
 708                 if (sscanf(piece, "%d-%d", &start, &finish) == 2) {
 709                         /* Range */
 710                 } else if (sscanf(piece, "%d", &start)) {
 711                         /* Just one */
 712                         finish = start;
 713                 } else {
 714                         ast_log(LOG_ERROR, "Syntax error parsing '%s' at '%s'.  Using '0'\n", s,piece);
 715                         return 0;
 716                 }
 717                 for (x=start;x<=finish;x++) {
 718                         if ((x > 31) || (x < 0)) {
 719                                 ast_log(LOG_WARNING, "Ignoring invalid group %d\n", x);
 720                         } else
 721                                 group |= (1 << x);
 722                 }
 723         }
 724         return group;
 725 }
 726
 727 int unload_module(void)
 728 {
 729         STANDARD_HANGUP_LOCALUSERS;
 730
 731         ast_cli_unregister(&showparked);
 732
 733         return ast_unregister_application(parkedcall);
 734 }
 735
 736 char *description(void)
 737 {
 738         return "Call Parking Resource";
 739 }
 740
 741 int usecount(void)
 742 {
 743         /* Never allow parking to be unloaded because it will
 744            unresolve needed symbols in the dialer */
 745 #if 0
 746         int res;
 747         STANDARD_USECOUNT(res);
 748         return res;
 749 #else
 750         return 1;
 751 #endif
 752 }
 753
 754 char *key()
 755 {
 756         return ASTERISK_GPL_KEY;
 757 }