aboutsummaryrefslogtreecommitdiffstats
path: root/res/res_parking.c
blob: da918bd8828cc335995205ccafd52a90354fa011 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Routines implementing call parking
 * 
 * Copyright (C) 1999, Mark Spencer
 *
 * Mark Spencer <markster@linux-support.net>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

#include <asterisk/lock.h>
#include <asterisk/file.h>
#include <asterisk/logger.h>
#include <asterisk/channel.h>
#include <asterisk/pbx.h>
#include <asterisk/options.h>
#include <asterisk/module.h>
#include <asterisk/translate.h>
#include <asterisk/say.h>
#include <asterisk/channel_pvt.h>
#include <asterisk/parking.h>
#include <asterisk/musiconhold.h>
#include <asterisk/config.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/signal.h>
#include <netinet/in.h>

#include <pthread.h>

#define DEFAULT_PARK_TIME 45000

static char *parkedcall = "ParkedCall";

/* No more than 45 seconds parked before you do something with them */
static int parkingtime = DEFAULT_PARK_TIME;

/* Context for which parking is made accessible */
static char parking_con[AST_MAX_EXTENSION] = "parkedcalls";

/* Extension you type to park the call */
static char parking_ext[AST_MAX_EXTENSION] = "700";

/* First available extension for parking */
static int parking_start = 701;

/* Last available extension for parking */
static int parking_stop = 750;

/* Registrar for operations */
static char *registrar = "res_parking";

static char *synopsis = "Answer a parked call";

static char *descrip = "ParkedCall(exten):"
"Used to connect to a parked call.  This Application is always\n"
"registered internally and does not need to be explicitly added\n"
"into the dialplan, although you should include the 'parkedcalls'\n"
"context.\n";

struct parkeduser {
	struct ast_channel *chan;
	struct timeval start;
	int parkingnum;
	/* Where to go if our parking time expires */
	char context[AST_MAX_EXTENSION];
	char exten[AST_MAX_EXTENSION];
	int priority;
	int parkingtime;
	struct parkeduser *next;
};

static struct parkeduser *parkinglot;

static pthread_mutex_t parking_lock = AST_MUTEX_INITIALIZER;

static pthread_t parking_thread;

STANDARD_LOCAL_USER;

LOCAL_USER_DECL;

char *ast_parking_ext(void)
{
	return parking_ext;
}

int ast_park_call(struct ast_channel *chan, struct ast_channel *peer, int timeout, int *extout)
{
	/* We put the user in the parking list, then wake up the parking thread to be sure it looks
	   after these channels too */
	struct parkeduser *pu, *cur;
	int x;
	pu = malloc(sizeof(struct parkeduser));
	if (pu) {
		ast_pthread_mutex_lock(&parking_lock);
		for (x=parking_start;x<=parking_stop;x++) {
			cur = parkinglot;
			while(cur) {
				if (cur->parkingnum == x) 
					break;
				cur = cur->next;
			}
			if (!cur)
				break;
		}
		if (x <= parking_stop) {
			pu->chan = chan;
			ast_moh_start(pu->chan, NULL);
			gettimeofday(&pu->start, NULL);
			pu->parkingnum = x;
			if (timeout > 0)
				pu->parkingtime = timeout;
			else
				pu->parkingtime = parkingtime;
			if (extout)
				*extout = x;
			/* Remember what had been dialed, so that if the parking
			   expires, we try to come back to the same place */
			strncpy(pu->context, chan->context, sizeof(pu->context)-1);
			strncpy(pu->exten, chan->exten, sizeof(pu->exten)-1);
			pu->priority = chan->priority;
			pu->next = parkinglot;
			parkinglot = pu;
			ast_pthread_mutex_unlock(&parking_lock);
			/* Wake up the (presumably select()ing) thread */
			pthread_kill(parking_thread, SIGURG);
			if (option_verbose > 1) 
				ast_verbose(VERBOSE_PREFIX_2 "Parked %s on %d\n", pu->chan->name, pu->parkingnum);
			if (peer)
				ast_say_digits(peer, pu->parkingnum, "", peer->language);
			/* Start music on hold */
			return 0;
		} else {
			ast_log(LOG_WARNING, "No more parking spaces\n");
			free(pu);
			ast_pthread_mutex_unlock(&parking_lock);
			return -1;
		}
	} else {
		ast_log(LOG_WARNING, "Out of memory\n");
		return -1;
	}
	return 0;
}

int ast_masq_park_call(struct ast_channel *rchan, struct ast_channel *peer, int timeout, int *extout)
{
	struct ast_channel *chan;
	struct ast_frame *f;
	/* Make a new, fake channel that we'll use to masquerade in the real one */
	chan = ast_channel_alloc(0);
	if (chan) {
		/* Let us keep track of the channel name */
		snprintf(chan->name, sizeof (chan->name), "Parked/%s",rchan->name);
		/* Make formats okay */
		chan->readformat = rchan->readformat;
		chan->writeformat = rchan->writeformat;
		ast_channel_masquerade(chan, rchan);
		/* Setup the extensions and such */
		strncpy(chan->context, rchan->context, sizeof(chan->context) - 1);
		strncpy(chan->exten, rchan->exten, sizeof(chan->exten) - 1);
		chan->priority = rchan->priority;
		/* Make the masq execute */
		f = ast_read(chan);
		if (f)
			ast_frfree(f);
		ast_park_call(chan, peer, timeout, extout);
	} else {
		ast_log(LOG_WARNING, "Unable to create parked channel\n");
		return -1;
	}
	return 0;
}

int ast_bridge_call(struct ast_channel *chan, struct ast_channel *peer, int allowredirect, int allowdisconnect)
{
	/* Copy voice back and forth between the two channels.  Give the peer
	   the ability to transfer calls with '#<extension' syntax. */
	int len;
	struct ast_frame *f;
	struct ast_channel *who;
	char newext[256], *ptr;
	int res;
	struct ast_option_header *aoh;
	/* Answer if need be */
	if (ast_answer(chan))
		return -1;
	peer->appl = "Bridged Call";
	peer->data = chan->name;
	for (;;) {
		res = ast_channel_bridge(chan, peer, (allowdisconnect ? AST_BRIDGE_DTMF_CHANNEL_0 : 0) + (allowredirect ? AST_BRIDGE_DTMF_CHANNEL_1 : 0), &f, &who);
		if (res < 0) {
			ast_log(LOG_WARNING, "Bridge failed on channels %s and %s\n", chan->name, peer->name);
			return -1;
		}
		
		if (!f || ((f->frametype == AST_FRAME_CONTROL) && ((f->subclass == AST_CONTROL_HANGUP) || (f->subclass == AST_CONTROL_BUSY) || 
			(f->subclass == AST_CONTROL_CONGESTION)))) {
				res = -1;
				break;
		}
		if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_RINGING)) {
			if (who == chan)
				ast_indicate(peer, AST_CONTROL_RINGING);
			else
				ast_indicate(chan, AST_CONTROL_RINGING);
		}
		if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == -1)) {
			if (who == chan)
				ast_indicate(peer, -1);
			else
				ast_indicate(chan, -1);
		}
		if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_OPTION)) {
			aoh = f->data;
			/* Forward option Requests */
			if (aoh && (aoh->flag == AST_OPTION_FLAG_REQUEST)) {
				if (who == chan)
					ast_channel_setoption(peer, ntohs(aoh->option), aoh->data, f->datalen - sizeof(struct ast_option_header), 0);
				else
					ast_channel_setoption(chan, ntohs(aoh->option), aoh->data, f->datalen - sizeof(struct ast_option_header), 0);
			}
		}
            if (f && (f->frametype == AST_FRAME_DTMF) && (who == chan) && allowdisconnect &&
		     (f->subclass == '*')) {
		if (option_verbose > 3)
			ast_verbose(VERBOSE_PREFIX_3 "User hit %c to disconnect call.\n", f->subclass);
			res = -1;
			break;

			}
		if ((f->frametype == AST_FRAME_DTMF) && (who == peer) && allowredirect &&
		     (f->subclass == '#')) {
				/* Start autoservice on chan while we talk
				   to the peer */
				ast_autoservice_start(chan);
				memset(newext, 0, sizeof(newext));
				ptr = newext;
					/* Transfer */
				if ((res=ast_streamfile(peer, "pbx-transfer", peer->language))) {
					ast_autoservice_stop(chan);
					break;
				}
				if ((res=ast_waitstream(peer, AST_DIGIT_ANY)) < 0) {
					ast_autoservice_stop(chan);
					break;
				}
				ast_stopstream(peer);
				if (res > 0) {
					/* If they've typed a digit already, handle it */
					newext[0] = res;
					ptr++;
					len --;
				}
				res = 0;
				while(strlen(newext) < sizeof(newext) - 1) {
					res = ast_waitfordigit(peer, 3000);
					if (res < 1) 
						break;
					if (res == '#')
						break;
					*(ptr++) = res;
					if (!ast_matchmore_extension(peer, peer->context, newext, 1, peer->callerid)) {
						break;
					}
				}

				if (res < 0) {
					ast_autoservice_stop(chan);
					break;
				}
				if (!strcmp(newext, ast_parking_ext())) {
					if (ast_autoservice_stop(chan))
						res = -1;
					else if (!ast_park_call(chan, peer, 0, NULL)) {
						/* We return non-zero, but tell the PBX not to hang the channel when
						   the thread dies -- We have to be careful now though.  We are responsible for 
						   hanging up the channel, else it will never be hung up! */
						res=AST_PBX_KEEPALIVE;
						break;
					} else {
						ast_log(LOG_WARNING, "Unable to park call %s\n", chan->name);
					}
					/* XXX Maybe we should have another message here instead of invalid extension XXX */
				} else if (ast_exists_extension(chan, peer->context, newext, 1, peer->callerid)) {
					res=ast_autoservice_stop(chan);
					if (!chan->pbx) {
						/* Doh!  Use our handy async_goto funcitons */
						if (option_verbose > 2) 
							ast_verbose(VERBOSE_PREFIX_3 "Transferring %s to '%s' (context %s) priority 1\n", chan->name, chan->exten, chan->context);
						if (ast_async_goto(chan, peer->context, newext, 1, 1))
							ast_log(LOG_WARNING, "Async goto fialed :(\n");
					} else {
						/* Set the channel's new extension, since it exists, using peer context */
						strncpy(chan->exten, newext, sizeof(chan->exten)-1);
						strncpy(chan->context, peer->context, sizeof(chan->context)-1);
						chan->priority = 0;
						ast_frfree(f);
					}
					break;
				} else {
					if (option_verbose > 2)	
						ast_verbose(VERBOSE_PREFIX_3 "Unable to find extension '%s' in context %s\n", newext, peer->context);
				}
				res = ast_streamfile(peer, "pbx-invalid", chan->language);
				if (res) {
					ast_autoservice_stop(chan);
					break;
				}
				res = ast_waitstream(peer, AST_DIGIT_ANY);
				ast_stopstream(peer);
				res = ast_autoservice_stop(chan);
				if (res) {
					if (option_verbose > 1)
						ast_verbose(VERBOSE_PREFIX_2 "Hungup during autoservice stop on '%s'\n", chan->name);
				}
			} else {
            if (f && (f->frametype == AST_FRAME_DTMF)) {
                  if (who == peer)
                        ast_write(chan, f);
                  else
                        ast_write(peer, f);
            }            
#if 1
				ast_log(LOG_DEBUG, "Read from %s (%d,%d)\n", who->name, f->frametype, f->subclass);
#endif
			}
         if (f)
               ast_frfree(f);
	}
	return res;
}

static void *do_parking_thread(void *ignore)
{
	int ms, tms, max;
	struct parkeduser *pu, *pl, *pt = NULL;
	struct timeval tv;
	struct ast_frame *f;
	int x;
	fd_set rfds, efds;
	fd_set nrfds, nefds;
	FD_ZERO(&rfds);
	FD_ZERO(&efds);
	for (;;) {
		ms = -1;
		max = -1;
		ast_pthread_mutex_lock(&parking_lock);
		pl = NULL;
		pu = parkinglot;
		gettimeofday(&tv, NULL);
		FD_ZERO(&nrfds);
		FD_ZERO(&nefds);
		while(pu) {
			tms = (tv.tv_sec - pu->start.tv_sec) * 1000 + (tv.tv_usec - pu->start.tv_usec) / 1000;
			if (tms > pu->parkingtime) {
				/* They've been waiting too long, send them back to where they came.  Theoretically they
				   should have their original extensions and such, but we copy to be on the safe side */
				strncpy(pu->chan->exten, pu->exten, sizeof(pu->chan->exten)-1);
				strncpy(pu->chan->context, pu->context, sizeof(pu->chan->context)-1);
				pu->chan->priority = pu->priority;
				/* Stop music on hold */
				ast_moh_stop(pu->chan);
				/* Start up the PBX, or hang them up */
				if (ast_pbx_start(pu->chan))  {
					ast_log(LOG_WARNING, "Unable to restart the PBX for user on '%s', hanging them up...\n", pu->chan->name);
					ast_hangup(pu->chan);
				}
				/* And take them out of the parking lot */
				if (pl) 
					pl->next = pu->next;
				else
					parkinglot = pu->next;
				pt = pu;
				pu = pu->next;
				free(pt);
			} else {
				for (x=0;x<AST_MAX_FDS;x++) {
					if ((pu->chan->fds[x] > -1) && (FD_ISSET(pu->chan->fds[x], &rfds) || FD_ISSET(pu->chan->fds[x], &efds))) {
							if (FD_ISSET(pu->chan->fds[x], &efds))
								pu->chan->exception = 1;
							pu->chan->fdno = x;
							/* See if they need servicing */
							f = ast_read(pu->chan);
							if (!f || ((f->frametype == AST_FRAME_CONTROL) && (f->subclass ==  AST_CONTROL_HANGUP))) {
							/* There's a problem, hang them up*/
							if (option_verbose > 1) 
								ast_verbose(VERBOSE_PREFIX_2 "%s got tired of being parked\n", pu->chan->name);
							ast_hangup(pu->chan);
							/* And take them out of the parking lot */
							if (pl) 
								pl->next = pu->next;
							else
								parkinglot = pu->next;
							pt = pu;
							pu = pu->next;
							free(pt);
							break;
						} else {
							/* XXX Maybe we could do something with packets, like dial "0" for operator or something XXX */
							ast_frfree(f);
							goto std;	/* XXX Ick: jumping into an else statement??? XXX */
						}
					}
				}
				if (x >= AST_MAX_FDS) {
std:					for (x=0;x<AST_MAX_FDS;x++) {
						/* Keep this one for next one */
						if (pu->chan->fds[x] > -1) {
							FD_SET(pu->chan->fds[x], &nrfds);
							FD_SET(pu->chan->fds[x], &nefds);
							if (pu->chan->fds[x] > max)
								max = pu->chan->fds[x];
						}
					}
					/* Keep track of our longest wait */
					if ((tms < ms) || (ms < 0))
						ms = tms;
					pl = pu;
					pu = pu->next;
				}
			}
		}
		ast_pthread_mutex_unlock(&parking_lock);
		rfds = nrfds;
		efds = nefds;
		tv.tv_sec = ms / 1000;
		tv.tv_usec = (ms % 1000) * 1000;
		/* Wait for something to happen */
		select(max + 1, &rfds, NULL, &efds, (ms > -1) ? &tv : NULL);
		pthread_testcancel();
	}
	return NULL;	/* Never reached */
}

static int park_exec(struct ast_channel *chan, void *data)
{
	int res=0;
	struct localuser *u;
	struct ast_channel *peer=NULL;
	struct parkeduser *pu, *pl=NULL;
	int park;
	int dres;
	if (!data) {
		ast_log(LOG_WARNING, "Park requires an argument (extension number)\n");
		return -1;
	}
	LOCAL_USER_ADD(u);
	park = atoi((char *)data);
	ast_pthread_mutex_lock(&parking_lock);
	pu = parkinglot;
	while(pu) {
		if (pu->parkingnum == park) {
			if (pl)
				pl->next = pu->next;
			else
				parkinglot = pu->next;
			break;
		}
		pl = pu;
		pu = pu->next;
	}
	ast_pthread_mutex_unlock(&parking_lock);
	if (pu) {
		peer = pu->chan;
		free(pu);
	}
	/* JK02: it helps to answer the channel if not already up */
	if (chan->_state != AST_STATE_UP) {
		ast_answer(chan);
	}

	if (peer) {
		ast_moh_stop(peer);
		res = ast_channel_make_compatible(chan, peer);
		if (res < 0) {
			ast_log(LOG_WARNING, "Could not make channels %s and %s compatible for bridge\n", chan->name, peer->name);
			ast_hangup(peer);
			return -1;
		}
		/* This runs sorta backwards, since we give the incoming channel control, as if it
		   were the person called. */
		if (option_verbose > 2) 
			ast_verbose(VERBOSE_PREFIX_3 "Channel %s connected to parked call %d\n", chan->name, park);
		res = ast_bridge_call(peer, chan, 1, 0);
		/* Simulate the PBX hanging up */
		if (res != AST_PBX_KEEPALIVE)
			ast_hangup(peer);
		return -1;
	} else {
		/* XXX Play a message XXX */
	  dres = ast_streamfile(chan, "pbx-invalidpark", chan->language);
	  if (!dres)
	    dres = ast_waitstream(chan, "");
	  else {
	    ast_log(LOG_WARNING, "ast_streamfile of %s failed on %s\n", "pbx-invalidpark", chan->name);
	    dres = 0;
	  }
		if (option_verbose > 2) 
			ast_verbose(VERBOSE_PREFIX_3 "Channel %s tried to talk to non-existant parked call %d\n", chan->name, park);
		res = -1;
	}
	LOCAL_USER_REMOVE(u);
	return res;
}

int load_module(void)
{
	int res;
	int x;
	int start, end;
	struct ast_context *con;
	char exten[AST_MAX_EXTENSION];
	struct ast_config *cfg;
	struct ast_variable *var;
	cfg = ast_load("parking.conf");
	if (cfg) {
		var = ast_variable_browse(cfg, "general");
		while(var) {
			if (!strcasecmp(var->name, "parkext")) {
				strncpy(parking_ext, var->value, sizeof(parking_ext) - 1);
			} else if (!strcasecmp(var->name, "context")) {
				strncpy(parking_con, var->value, sizeof(parking_con) - 1);
			} else if (!strcasecmp(var->name, "parkingtime")) {
				if ((sscanf(var->value, "%d", &parkingtime) != 1) || (parkingtime < 1)) {
					ast_log(LOG_WARNING, "%s is not a valid parkingtime\n", var->value);
					parkingtime = DEFAULT_PARK_TIME;
				} else
					parkingtime = parkingtime * 1000;
			} else if (!strcasecmp(var->name, "parkpos")) {
				if (sscanf(var->value, "%i-%i", &start, &end) != 2) {
					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);
				} else {
					parking_start = start;
					parking_stop = end;
				}
			}
			var = var->next;
		}
		ast_destroy(cfg);
	}
	con = ast_context_find(parking_con);
	if (!con) {
		con = ast_context_create(parking_con, registrar);
		if (!con) {
			ast_log(LOG_ERROR, "Parking context '%s' does not exist and unable to create\n", parking_con);
			return -1;
		}
	}
	for(x=parking_start; x<=parking_stop;x++) {
		snprintf(exten, sizeof(exten), "%d", x);
		ast_add_extension2(con, 1, exten, 1, NULL, parkedcall, strdup(exten), free, registrar);
	}
	pthread_create(&parking_thread, NULL, do_parking_thread, NULL);
	res = ast_register_application(parkedcall, park_exec, synopsis, descrip);
	return res;
}

int unload_module(void)
{
	STANDARD_HANGUP_LOCALUSERS;
	return ast_unregister_application(parkedcall);
}

char *description(void)
{
	return "Call Parking Resource";
}

int usecount(void)
{
	/* Never allow parking to be unloaded because it will
	   unresolve needed symbols in the dialer */
#if 0
	int res;
	STANDARD_USECOUNT(res);
	return res;
#else
	return 1;
#endif
}

char *key()
{
	return ASTERISK_GPL_KEY;
}