New functions for locking a channel - these simplify debugging
[asterisk/asterisk.git] / channel.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 1999 - 2006, Digium, Inc.
5  *
6  * Mark Spencer <markster@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 Channel Management
22  *
23  * \author Mark Spencer <markster@digium.com>
24  */
25
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sys/time.h>
30 #include <signal.h>
31 #include <errno.h>
32 #include <unistd.h>
33 #include <math.h>                       /* For PI */
34
35 #ifdef ZAPTEL_OPTIMIZATIONS
36 #include <sys/ioctl.h>
37 #ifdef __linux__
38 #include <linux/zaptel.h>
39 #else
40 #include <zaptel.h>
41 #endif /* __linux__ */
42 #ifndef ZT_TIMERPING
43 #error "You need newer zaptel!  Please cvs update zaptel"
44 #endif
45 #endif
46
47 #include "asterisk.h"
48
49 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
50
51 #include "asterisk/pbx.h"
52 #include "asterisk/frame.h"
53 #include "asterisk/sched.h"
54 #include "asterisk/options.h"
55 #include "asterisk/channel.h"
56 #include "asterisk/chanspy.h"
57 #include "asterisk/musiconhold.h"
58 #include "asterisk/logger.h"
59 #include "asterisk/say.h"
60 #include "asterisk/file.h"
61 #include "asterisk/cli.h"
62 #include "asterisk/translate.h"
63 #include "asterisk/manager.h"
64 #include "asterisk/chanvars.h"
65 #include "asterisk/linkedlists.h"
66 #include "asterisk/indications.h"
67 #include "asterisk/monitor.h"
68 #include "asterisk/causes.h"
69 #include "asterisk/callerid.h"
70 #include "asterisk/utils.h"
71 #include "asterisk/lock.h"
72 #include "asterisk/app.h"
73 #include "asterisk/transcap.h"
74 #include "asterisk/devicestate.h"
75 #include "asterisk/sha1.h"
76
77 struct channel_spy_trans {
78         int last_format;
79         struct ast_trans_pvt *path;
80 };
81
82 struct ast_channel_spy_list {
83         struct channel_spy_trans read_translator;
84         struct channel_spy_trans write_translator;
85         AST_LIST_HEAD_NOLOCK(, ast_channel_spy) list;
86 };
87
88 /* uncomment if you have problems with 'monitoring' synchronized files */
89 #if 0
90 #define MONITOR_CONSTANT_DELAY
91 #define MONITOR_DELAY   150 * 8         /* 150 ms of MONITORING DELAY */
92 #endif
93
94 /*! Prevent new channel allocation if shutting down. */
95 static int shutting_down = 0;
96
97 AST_MUTEX_DEFINE_STATIC(uniquelock);
98 static int uniqueint = 0;
99
100 unsigned long global_fin = 0, global_fout = 0;
101
102 /* XXX Lock appropriately in more functions XXX */
103
104 struct chanlist {
105         const struct ast_channel_tech *tech;
106         AST_LIST_ENTRY(chanlist) list;
107 };
108
109 /*! the list of registered channel types */
110 static AST_LIST_HEAD_NOLOCK_STATIC(backends, chanlist);
111
112 /*! the list of channels we have. Note that the lock for this list is used for
113     both the channels list and the backends list.  */
114 static AST_LIST_HEAD_STATIC(channels, ast_channel);
115
116 /*! map AST_CAUSE's to readable string representations */
117 const struct ast_cause {
118         int cause;
119         const char *desc;
120 } causes[] = {
121         { AST_CAUSE_UNALLOCATED, "Unallocated (unassigned) number" },
122         { AST_CAUSE_NO_ROUTE_TRANSIT_NET, "No route to specified transmit network" },
123         { AST_CAUSE_NO_ROUTE_DESTINATION, "No route to destination" },
124         { AST_CAUSE_CHANNEL_UNACCEPTABLE, "Channel unacceptable" },
125         { AST_CAUSE_CALL_AWARDED_DELIVERED, "Call awarded and being delivered in an established channel" },
126         { AST_CAUSE_NORMAL_CLEARING, "Normal Clearing" },
127         { AST_CAUSE_USER_BUSY, "User busy" },
128         { AST_CAUSE_NO_USER_RESPONSE, "No user responding" },
129         { AST_CAUSE_NO_ANSWER, "User alerting, no answer" },
130         { AST_CAUSE_CALL_REJECTED, "Call Rejected" },
131         { AST_CAUSE_NUMBER_CHANGED, "Number changed" },
132         { AST_CAUSE_DESTINATION_OUT_OF_ORDER, "Destination out of order" },
133         { AST_CAUSE_INVALID_NUMBER_FORMAT, "Invalid number format" },
134         { AST_CAUSE_FACILITY_REJECTED, "Facility rejected" },
135         { AST_CAUSE_RESPONSE_TO_STATUS_ENQUIRY, "Response to STATus ENQuiry" },
136         { AST_CAUSE_NORMAL_UNSPECIFIED, "Normal, unspecified" },
137         { AST_CAUSE_NORMAL_CIRCUIT_CONGESTION, "Circuit/channel congestion" },
138         { AST_CAUSE_NETWORK_OUT_OF_ORDER, "Network out of order" },
139         { AST_CAUSE_NORMAL_TEMPORARY_FAILURE, "Temporary failure" },
140         { AST_CAUSE_SWITCH_CONGESTION, "Switching equipment congestion" },
141         { AST_CAUSE_ACCESS_INFO_DISCARDED, "Access information discarded" },
142         { AST_CAUSE_REQUESTED_CHAN_UNAVAIL, "Requested channel not available" },
143         { AST_CAUSE_PRE_EMPTED, "Pre-empted" },
144         { AST_CAUSE_FACILITY_NOT_SUBSCRIBED, "Facility not subscribed" },
145         { AST_CAUSE_OUTGOING_CALL_BARRED, "Outgoing call barred" },
146         { AST_CAUSE_INCOMING_CALL_BARRED, "Incoming call barred" },
147         { AST_CAUSE_BEARERCAPABILITY_NOTAUTH, "Bearer capability not authorized" },
148         { AST_CAUSE_BEARERCAPABILITY_NOTAVAIL, "Bearer capability not available" },
149         { AST_CAUSE_BEARERCAPABILITY_NOTIMPL, "Bearer capability not implemented" },
150         { AST_CAUSE_CHAN_NOT_IMPLEMENTED, "Channel not implemented" },
151         { AST_CAUSE_FACILITY_NOT_IMPLEMENTED, "Facility not implemented" },
152         { AST_CAUSE_INVALID_CALL_REFERENCE, "Invalid call reference value" },
153         { AST_CAUSE_INCOMPATIBLE_DESTINATION, "Incompatible destination" },
154         { AST_CAUSE_INVALID_MSG_UNSPECIFIED, "Invalid message unspecified" },
155         { AST_CAUSE_MANDATORY_IE_MISSING, "Mandatory information element is missing" },
156         { AST_CAUSE_MESSAGE_TYPE_NONEXIST, "Message type nonexist." },
157         { AST_CAUSE_WRONG_MESSAGE, "Wrong message" },
158         { AST_CAUSE_IE_NONEXIST, "Info. element nonexist or not implemented" },
159         { AST_CAUSE_INVALID_IE_CONTENTS, "Invalid information element contents" },
160         { AST_CAUSE_WRONG_CALL_STATE, "Message not compatible with call state" },
161         { AST_CAUSE_RECOVERY_ON_TIMER_EXPIRE, "Recover on timer expiry" },
162         { AST_CAUSE_MANDATORY_IE_LENGTH_ERROR, "Mandatory IE length error" },
163         { AST_CAUSE_PROTOCOL_ERROR, "Protocol error, unspecified" },
164         { AST_CAUSE_INTERWORKING, "Interworking, unspecified" },
165 };
166
167
168 struct ast_variable *ast_channeltype_list(void)
169 {
170         struct chanlist *cl;
171         struct ast_variable *var=NULL, *prev = NULL;
172         AST_LIST_TRAVERSE(&backends, cl, list) {
173                 if (prev)  {
174                         if ((prev->next = ast_variable_new(cl->tech->type, cl->tech->description)))
175                                 prev = prev->next;
176                 } else {
177                         var = ast_variable_new(cl->tech->type, cl->tech->description);
178                         prev = var;
179                 }
180         }
181         return var;
182 }
183
184 static int show_channeltypes(int fd, int argc, char *argv[])
185 {
186 #define FORMAT  "%-10.10s  %-40.40s %-12.12s %-12.12s %-12.12s\n"
187         struct chanlist *cl;
188         int count_chan = 0;
189
190         ast_cli(fd, FORMAT, "Type", "Description",       "Devicestate", "Indications", "Transfer");
191         ast_cli(fd, FORMAT, "----------", "-----------", "-----------", "-----------", "--------");
192         if (AST_LIST_LOCK(&channels)) {
193                 ast_log(LOG_WARNING, "Unable to lock channel list\n");
194                 return -1;
195         }
196         AST_LIST_TRAVERSE(&backends, cl, list) {
197                 ast_cli(fd, FORMAT, cl->tech->type, cl->tech->description,
198                         (cl->tech->devicestate) ? "yes" : "no",
199                         (cl->tech->indicate) ? "yes" : "no",
200                         (cl->tech->transfer) ? "yes" : "no");
201                 count_chan++;
202         }
203         AST_LIST_UNLOCK(&channels);
204         ast_cli(fd, "----------\n%d channel drivers registered.\n", count_chan);
205         return RESULT_SUCCESS;
206
207 #undef FORMAT
208
209 }
210
211 static int show_channeltype(int fd, int argc, char *argv[])
212 {
213         struct chanlist *cl = NULL;
214
215         if (argc != 3)
216                 return RESULT_SHOWUSAGE;
217         
218         if (AST_LIST_LOCK(&channels)) {
219                 ast_log(LOG_WARNING, "Unable to lock channel list\n");
220                 return RESULT_FAILURE;
221         }
222
223         AST_LIST_TRAVERSE(&backends, cl, list) {
224                 if (!strncasecmp(cl->tech->type, argv[2], strlen(cl->tech->type))) {
225                         break;
226                 }
227         }
228
229
230         if (!cl) {
231                 ast_cli(fd, "\n%s is not a registered channel driver.\n", argv[2]);
232                 AST_LIST_UNLOCK(&channels);
233                 return RESULT_FAILURE;
234         }
235
236         ast_cli(fd,
237                 "-- Info about channel driver: %s --\n"
238                 "  Device State: %s\n"
239                 "    Indication: %s\n"
240                 "     Transfer : %s\n"
241                 "  Capabilities: %d\n"
242                 "    Send Digit: %s\n"
243                 "    Send HTML : %s\n"
244                 " Image Support: %s\n"
245                 "  Text Support: %s\n",
246                 cl->tech->type,
247                 (cl->tech->devicestate) ? "yes" : "no",
248                 (cl->tech->indicate) ? "yes" : "no",
249                 (cl->tech->transfer) ? "yes" : "no",
250                 (cl->tech->capabilities) ? cl->tech->capabilities : -1,
251                 (cl->tech->send_digit) ? "yes" : "no",
252                 (cl->tech->send_html) ? "yes" : "no",
253                 (cl->tech->send_image) ? "yes" : "no",
254                 (cl->tech->send_text) ? "yes" : "no"
255                 
256         );
257
258         AST_LIST_UNLOCK(&channels);
259         return RESULT_SUCCESS;
260 }
261
262 static char *complete_channeltypes(const char *line, const char *word, int pos, int state)
263 {
264         struct chanlist *cl;
265         int which = 0;
266         int wordlen;
267         char *ret = NULL;
268
269         if (pos != 2)
270                 return NULL;
271
272         wordlen = strlen(word);
273
274         AST_LIST_TRAVERSE(&backends, cl, list) {
275                 if (!strncasecmp(word, cl->tech->type, wordlen) && ++which > state) {
276                         ret = strdup(cl->tech->type);
277                         break;
278                 }
279         }
280         
281         return ret;
282 }
283
284 static char show_channeltypes_usage[] =
285 "Usage: show channeltypes\n"
286 "       Shows available channel types registered in your Asterisk server.\n";
287
288 static char show_channeltype_usage[] =
289 "Usage: show channeltype <name>\n"
290 "       Show details about the specified channel type, <name>.\n";
291
292 static struct ast_cli_entry cli_show_channeltypes =
293         { { "show", "channeltypes", NULL }, show_channeltypes, "Show available channel types", show_channeltypes_usage };
294
295 static struct ast_cli_entry cli_show_channeltype =
296         { { "show", "channeltype", NULL }, show_channeltype, "Give more details on that channel type", show_channeltype_usage, complete_channeltypes };
297
298 /*! \brief Checks to see if a channel is needing hang up */
299 int ast_check_hangup(struct ast_channel *chan)
300 {
301         if (chan->_softhangup)          /* yes if soft hangup flag set */
302                 return 1;
303         if (!chan->tech_pvt)            /* yes if no technology private data */
304                 return 1;
305         if (!chan->whentohangup)        /* no if no hangup scheduled */
306                 return 0;
307         if (chan->whentohangup > time(NULL))    /* no if hangup time has not come yet. */
308                 return 0;
309         chan->_softhangup |= AST_SOFTHANGUP_TIMEOUT;    /* record event */
310         return 1;
311 }
312
313 static int ast_check_hangup_locked(struct ast_channel *chan)
314 {
315         int res;
316         ast_mutex_lock(&chan->lock);
317         res = ast_check_hangup(chan);
318         ast_mutex_unlock(&chan->lock);
319         return res;
320 }
321
322 /*! \brief Initiate system shutdown */
323 void ast_begin_shutdown(int hangup)
324 {
325         struct ast_channel *c;
326         shutting_down = 1;
327         if (hangup) {
328                 AST_LIST_LOCK(&channels);
329                 AST_LIST_TRAVERSE(&channels, c, chan_list)
330                         ast_softhangup(c, AST_SOFTHANGUP_SHUTDOWN);
331                 AST_LIST_UNLOCK(&channels);
332         }
333 }
334
335 /*! \brief returns number of active/allocated channels */
336 int ast_active_channels(void)
337 {
338         struct ast_channel *c;
339         int cnt = 0;
340         AST_LIST_LOCK(&channels);
341         AST_LIST_TRAVERSE(&channels, c, chan_list)
342                 cnt++;
343         AST_LIST_UNLOCK(&channels);
344         return cnt;
345 }
346
347 /*! \brief Cancel a shutdown in progress */
348 void ast_cancel_shutdown(void)
349 {
350         shutting_down = 0;
351 }
352
353 /*! \brief Returns non-zero if Asterisk is being shut down */
354 int ast_shutting_down(void)
355 {
356         return shutting_down;
357 }
358
359 /*! \brief Set when to hangup channel */
360 void ast_channel_setwhentohangup(struct ast_channel *chan, time_t offset)
361 {
362         chan->whentohangup = offset ? time(NULL) + offset : 0;
363         ast_queue_frame(chan, &ast_null_frame);
364         return;
365 }
366
367 /*! \brief Compare a offset with when to hangup channel */
368 int ast_channel_cmpwhentohangup(struct ast_channel *chan, time_t offset)
369 {
370         time_t whentohangup;
371
372         if (chan->whentohangup == 0) {
373                 return (offset == 0) ? 0 : -1;
374         } else {
375                 if (offset == 0)        /* XXX why is this special ? */
376                         return (1);
377                 else {
378                         whentohangup = offset + time (NULL);
379                         if (chan->whentohangup < whentohangup)
380                                 return (1);
381                         else if (chan->whentohangup == whentohangup)
382                                 return (0);
383                         else
384                                 return (-1);
385                 }
386         }
387 }
388
389 /*! \brief Register a new telephony channel in Asterisk */
390 int ast_channel_register(const struct ast_channel_tech *tech)
391 {
392         struct chanlist *chan;
393
394         AST_LIST_LOCK(&channels);
395
396         AST_LIST_TRAVERSE(&backends, chan, list) {
397                 if (!strcasecmp(tech->type, chan->tech->type)) {
398                         ast_log(LOG_WARNING, "Already have a handler for type '%s'\n", tech->type);
399                         AST_LIST_UNLOCK(&channels);
400                         return -1;
401                 }
402         }
403         
404         if (!(chan = ast_malloc(sizeof(*chan)))) {
405                 AST_LIST_UNLOCK(&channels);
406                 return -1;
407         }
408         chan->tech = tech;
409         AST_LIST_INSERT_HEAD(&backends, chan, list);
410
411         if (option_debug)
412                 ast_log(LOG_DEBUG, "Registered handler for '%s' (%s)\n", chan->tech->type, chan->tech->description);
413
414         if (option_verbose > 1)
415                 ast_verbose(VERBOSE_PREFIX_2 "Registered channel type '%s' (%s)\n", chan->tech->type,
416                             chan->tech->description);
417
418         AST_LIST_UNLOCK(&channels);
419         return 0;
420 }
421
422 void ast_channel_unregister(const struct ast_channel_tech *tech)
423 {
424         struct chanlist *chan;
425
426         if (option_debug)
427                 ast_log(LOG_DEBUG, "Unregistering channel type '%s'\n", tech->type);
428
429         AST_LIST_LOCK(&channels);
430
431         AST_LIST_TRAVERSE_SAFE_BEGIN(&backends, chan, list) {
432                 if (chan->tech == tech) {
433                         AST_LIST_REMOVE_CURRENT(&backends, list);
434                         free(chan);
435                         if (option_verbose > 1)
436                                 ast_verbose(VERBOSE_PREFIX_2 "Unregistered channel type '%s'\n", tech->type);
437                         break;  
438                 }
439         }
440         AST_LIST_TRAVERSE_SAFE_END
441
442         AST_LIST_UNLOCK(&channels);
443 }
444
445 const struct ast_channel_tech *ast_get_channel_tech(const char *name)
446 {
447         struct chanlist *chanls;
448         const struct ast_channel_tech *ret = NULL;
449
450         if (AST_LIST_LOCK(&channels)) {
451                 ast_log(LOG_WARNING, "Unable to lock channel tech list\n");
452                 return NULL;
453         }
454
455         AST_LIST_TRAVERSE(&backends, chanls, list) {
456                 if (!strcasecmp(name, chanls->tech->type)) {
457                         ret = chanls->tech;
458                         break;
459                 }
460         }
461
462         AST_LIST_UNLOCK(&channels);
463         
464         return ret;
465 }
466
467 /*! \brief Gives the string form of a given hangup cause */
468 const char *ast_cause2str(int cause)
469 {
470         int x;
471
472         for (x=0; x < sizeof(causes) / sizeof(causes[0]); x++) {
473                 if (causes[x].cause == cause)
474                         return causes[x].desc;
475         }
476
477         return "Unknown";
478 }
479
480 /*! \brief Gives the string form of a given channel state */
481 char *ast_state2str(int state)
482 {
483         /* XXX Not reentrant XXX */
484         static char localtmp[256];
485         switch(state) {
486         case AST_STATE_DOWN:
487                 return "Down";
488         case AST_STATE_RESERVED:
489                 return "Rsrvd";
490         case AST_STATE_OFFHOOK:
491                 return "OffHook";
492         case AST_STATE_DIALING:
493                 return "Dialing";
494         case AST_STATE_RING:
495                 return "Ring";
496         case AST_STATE_RINGING:
497                 return "Ringing";
498         case AST_STATE_UP:
499                 return "Up";
500         case AST_STATE_BUSY:
501                 return "Busy";
502         default:
503                 snprintf(localtmp, sizeof(localtmp), "Unknown (%d)\n", state);
504                 return localtmp;
505         }
506 }
507
508 /*! \brief Gives the string form of a given transfer capability */
509 char *ast_transfercapability2str(int transfercapability)
510 {
511         switch(transfercapability) {
512         case AST_TRANS_CAP_SPEECH:
513                 return "SPEECH";
514         case AST_TRANS_CAP_DIGITAL:
515                 return "DIGITAL";
516         case AST_TRANS_CAP_RESTRICTED_DIGITAL:
517                 return "RESTRICTED_DIGITAL";
518         case AST_TRANS_CAP_3_1K_AUDIO:
519                 return "3K1AUDIO";
520         case AST_TRANS_CAP_DIGITAL_W_TONES:
521                 return "DIGITAL_W_TONES";
522         case AST_TRANS_CAP_VIDEO:
523                 return "VIDEO";
524         default:
525                 return "UNKNOWN";
526         }
527 }
528
529 /*! \brief Pick the best codec */
530 int ast_best_codec(int fmts)
531 {
532         /* This just our opinion, expressed in code.  We are asked to choose
533            the best codec to use, given no information */
534         int x;
535         static int prefs[] =
536         {
537                 /*! Okay, ulaw is used by all telephony equipment, so start with it */
538                 AST_FORMAT_ULAW,
539                 /*! Unless of course, you're a silly European, so then prefer ALAW */
540                 AST_FORMAT_ALAW,
541                 /*! Okay, well, signed linear is easy to translate into other stuff */
542                 AST_FORMAT_SLINEAR,
543                 /*! G.726 is standard ADPCM */
544                 AST_FORMAT_G726,
545                 /*! ADPCM has great sound quality and is still pretty easy to translate */
546                 AST_FORMAT_ADPCM,
547                 /*! Okay, we're down to vocoders now, so pick GSM because it's small and easier to
548                     translate and sounds pretty good */
549                 AST_FORMAT_GSM,
550                 /*! iLBC is not too bad */
551                 AST_FORMAT_ILBC,
552                 /*! Speex is free, but computationally more expensive than GSM */
553                 AST_FORMAT_SPEEX,
554                 /*! Ick, LPC10 sounds terrible, but at least we have code for it, if you're tacky enough
555                     to use it */
556                 AST_FORMAT_LPC10,
557                 /*! G.729a is faster than 723 and slightly less expensive */
558                 AST_FORMAT_G729A,
559                 /*! Down to G.723.1 which is proprietary but at least designed for voice */
560                 AST_FORMAT_G723_1,
561         };
562         
563         
564         /* Find the first preferred codec in the format given */
565         for (x=0; x < (sizeof(prefs) / sizeof(prefs[0]) ); x++)
566                 if (fmts & prefs[x])
567                         return prefs[x];
568         ast_log(LOG_WARNING, "Don't know any of 0x%x formats\n", fmts);
569         return 0;
570 }
571
572 static const struct ast_channel_tech null_tech = {
573         .type = "NULL",
574         .description = "Null channel (should not see this)",
575 };
576
577 /*! \brief Create a new channel structure */
578 struct ast_channel *ast_channel_alloc(int needqueue)
579 {
580         struct ast_channel *tmp;
581         int x;
582         int flags;
583         struct varshead *headp;
584
585         /* If shutting down, don't allocate any new channels */
586         if (shutting_down) {
587                 ast_log(LOG_WARNING, "Channel allocation failed: Refusing due to active shutdown\n");
588                 return NULL;
589         }
590
591         if (!(tmp = ast_calloc(1, sizeof(*tmp))))
592                 return NULL;
593
594         if (!(tmp->sched = sched_context_create())) {
595                 ast_log(LOG_WARNING, "Channel allocation failed: Unable to create schedule context\n");
596                 free(tmp);
597                 return NULL;
598         }
599         
600         ast_string_field_init(tmp, 128);
601
602         /* Don't bother initializing the last two FD here, because they
603            will *always* be set just a few lines down (AST_TIMING_FD,
604            AST_ALERT_FD). */
605         for (x=0; x<AST_MAX_FDS - 2; x++)
606                 tmp->fds[x] = -1;
607
608 #ifdef ZAPTEL_OPTIMIZATIONS
609         tmp->timingfd = open("/dev/zap/timer", O_RDWR);
610         if (tmp->timingfd > -1) {
611                 /* Check if timing interface supports new
612                    ping/pong scheme */
613                 flags = 1;
614                 if (!ioctl(tmp->timingfd, ZT_TIMERPONG, &flags))
615                         needqueue = 0;
616         }
617 #else
618         tmp->timingfd = -1;                                     
619 #endif                                  
620
621         if (needqueue) {
622                 if (pipe(tmp->alertpipe)) {
623                         ast_log(LOG_WARNING, "Channel allocation failed: Can't create alert pipe!\n");
624                         free(tmp);
625                         return NULL;
626                 } else {
627                         flags = fcntl(tmp->alertpipe[0], F_GETFL);
628                         fcntl(tmp->alertpipe[0], F_SETFL, flags | O_NONBLOCK);
629                         flags = fcntl(tmp->alertpipe[1], F_GETFL);
630                         fcntl(tmp->alertpipe[1], F_SETFL, flags | O_NONBLOCK);
631                 }
632         } else  /* Make sure we've got it done right if they don't */
633                 tmp->alertpipe[0] = tmp->alertpipe[1] = -1;
634
635         /* Always watch the alertpipe */
636         tmp->fds[AST_ALERT_FD] = tmp->alertpipe[0];
637         /* And timing pipe */
638         tmp->fds[AST_TIMING_FD] = tmp->timingfd;
639         ast_string_field_set(tmp, name, "**Unknown**");
640         /* Initial state */
641         tmp->_state = AST_STATE_DOWN;
642         tmp->streamid = -1;
643         tmp->appl = NULL;
644         tmp->data = NULL;
645         tmp->fin = global_fin;
646         tmp->fout = global_fout;
647         ast_mutex_lock(&uniquelock);
648         if (ast_strlen_zero(ast_config_AST_SYSTEM_NAME))
649                 ast_string_field_build(tmp, uniqueid, "%li.%d", (long) time(NULL), uniqueint++);
650         else
651                 ast_string_field_build(tmp, uniqueid, "%s-%li.%d", ast_config_AST_SYSTEM_NAME, (long) time(NULL), uniqueint++);
652         ast_mutex_unlock(&uniquelock);
653         headp = &tmp->varshead;
654         ast_mutex_init(&tmp->lock);
655         AST_LIST_HEAD_INIT_NOLOCK(headp);
656         AST_LIST_HEAD_INIT_NOLOCK(&tmp->datastores);
657         strcpy(tmp->context, "default");
658         ast_string_field_set(tmp, language, defaultlanguage);
659         strcpy(tmp->exten, "s");
660         tmp->priority = 1;
661         tmp->amaflags = ast_default_amaflags;
662         ast_string_field_set(tmp, accountcode, ast_default_accountcode);
663
664         tmp->tech = &null_tech;
665
666         AST_LIST_LOCK(&channels);
667         AST_LIST_INSERT_HEAD(&channels, tmp, chan_list);
668         AST_LIST_UNLOCK(&channels);
669         return tmp;
670 }
671
672 /*! \brief Queue an outgoing media frame */
673 int ast_queue_frame(struct ast_channel *chan, struct ast_frame *fin)
674 {
675         struct ast_frame *f;
676         struct ast_frame *prev, *cur;
677         int blah = 1;
678         int qlen = 0;
679
680         /* Build us a copy and free the original one */
681         if (!(f = ast_frdup(fin))) {
682                 ast_log(LOG_WARNING, "Unable to duplicate frame\n");
683                 return -1;
684         }
685         ast_mutex_lock(&chan->lock);
686         prev = NULL;
687         for (cur = chan->readq; cur; cur = cur->next) {
688                 if ((cur->frametype == AST_FRAME_CONTROL) && (cur->subclass == AST_CONTROL_HANGUP)) {
689                         /* Don't bother actually queueing anything after a hangup */
690                         ast_frfree(f);
691                         ast_mutex_unlock(&chan->lock);
692                         return 0;
693                 }
694                 prev = cur;
695                 qlen++;
696         }
697         /* Allow up to 96 voice frames outstanding, and up to 128 total frames */
698         if (((fin->frametype == AST_FRAME_VOICE) && (qlen > 96)) || (qlen  > 128)) {
699                 if (fin->frametype != AST_FRAME_VOICE) {
700                         ast_log(LOG_WARNING, "Exceptionally long queue length queuing to %s\n", chan->name);
701                         CRASH;
702                 } else {
703                         ast_log(LOG_DEBUG, "Dropping voice to exceptionally long queue on %s\n", chan->name);
704                         ast_frfree(f);
705                         ast_mutex_unlock(&chan->lock);
706                         return 0;
707                 }
708         }
709         if (prev)
710                 prev->next = f;
711         else
712                 chan->readq = f;
713         if (chan->alertpipe[1] > -1) {
714                 if (write(chan->alertpipe[1], &blah, sizeof(blah)) != sizeof(blah))
715                         ast_log(LOG_WARNING, "Unable to write to alert pipe on %s, frametype/subclass %d/%d (qlen = %d): %s!\n",
716                                 chan->name, f->frametype, f->subclass, qlen, strerror(errno));
717 #ifdef ZAPTEL_OPTIMIZATIONS
718         } else if (chan->timingfd > -1) {
719                 ioctl(chan->timingfd, ZT_TIMERPING, &blah);
720 #endif                          
721         } else if (ast_test_flag(chan, AST_FLAG_BLOCKING)) {
722                 pthread_kill(chan->blocker, SIGURG);
723         }
724         ast_mutex_unlock(&chan->lock);
725         return 0;
726 }
727
728 /*! \brief Queue a hangup frame for channel */
729 int ast_queue_hangup(struct ast_channel *chan)
730 {
731         struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_HANGUP };
732         /* Yeah, let's not change a lock-critical value without locking */
733         if (!ast_mutex_trylock(&chan->lock)) {
734                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
735                 ast_mutex_unlock(&chan->lock);
736         }
737         return ast_queue_frame(chan, &f);
738 }
739
740 /*! \brief Queue a control frame */
741 int ast_queue_control(struct ast_channel *chan, int control)
742 {
743         struct ast_frame f = { AST_FRAME_CONTROL, };
744         f.subclass = control;
745         return ast_queue_frame(chan, &f);
746 }
747
748 /*! \brief Set defer DTMF flag on channel */
749 int ast_channel_defer_dtmf(struct ast_channel *chan)
750 {
751         int pre = 0;
752
753         if (chan) {
754                 pre = ast_test_flag(chan, AST_FLAG_DEFER_DTMF);
755                 ast_set_flag(chan, AST_FLAG_DEFER_DTMF);
756         }
757         return pre;
758 }
759
760 /*! \brief Unset defer DTMF flag on channel */
761 void ast_channel_undefer_dtmf(struct ast_channel *chan)
762 {
763         if (chan)
764                 ast_clear_flag(chan, AST_FLAG_DEFER_DTMF);
765 }
766
767 /*!
768  * \brief Helper function to find channels.
769  *
770  * It supports these modes:
771  *
772  * prev != NULL : get channel next in list after prev
773  * name != NULL : get channel with matching name
774  * name != NULL && namelen != 0 : get channel whose name starts with prefix
775  * exten != NULL : get channel whose exten or macroexten matches
776  * context != NULL && exten != NULL : get channel whose context or macrocontext
777  *
778  * It returns with the channel's lock held. If getting the individual lock fails,
779  * unlock and retry quickly up to 10 times, then give up.
780  *
781  * \note XXX Note that this code has cost O(N) because of the need to verify
782  * that the object is still on the global list.
783  *
784  * \note XXX also note that accessing fields (e.g. c->name in ast_log())
785  * can only be done with the lock held or someone could delete the
786  * object while we work on it. This causes some ugliness in the code.
787  * Note that removing the first ast_log() may be harmful, as it would
788  * shorten the retry period and possibly cause failures.
789  * We should definitely go for a better scheme that is deadlock-free.
790  */
791 static struct ast_channel *channel_find_locked(const struct ast_channel *prev,
792                                                const char *name, const int namelen,
793                                                const char *context, const char *exten)
794 {
795         const char *msg = prev ? "deadlock" : "initial deadlock";
796         int retries, done;
797         struct ast_channel *c;
798
799         for (retries = 0; retries < 10; retries++) {
800                 AST_LIST_LOCK(&channels);
801                 AST_LIST_TRAVERSE(&channels, c, chan_list) {
802                         if (!prev) {
803                                 /* want head of list */
804                                 if (!name && !exten)
805                                         break;
806                                 if (name) {
807                                         /* want match by full name */
808                                         if (!namelen) {
809                                                 if (!strcasecmp(c->name, name))
810                                                         break;
811                                                 else
812                                                         continue;
813                                         }
814                                         /* want match by name prefix */
815                                         if (!strncasecmp(c->name, name, namelen))
816                                                 break;
817                                 } else if (exten) {
818                                         /* want match by context and exten */
819                                         if (context && (strcasecmp(c->context, context) &&
820                                                         strcasecmp(c->macrocontext, context)))
821                                                 continue;
822                                         /* match by exten */
823                                         if (strcasecmp(c->exten, exten) &&
824                                             strcasecmp(c->macroexten, exten))
825                                                 continue;
826                                         else
827                                                 break;
828                                 }
829                         } else if (c == prev) { /* found, return c->next */
830                                 c = AST_LIST_NEXT(c, chan_list);
831                                 break;
832                         }
833                 }
834                 /* exit if chan not found or mutex acquired successfully */
835                 done = (c == NULL) || (ast_mutex_trylock(&c->lock) == 0);
836                 /* this is slightly unsafe, as we _should_ hold the lock to access c->name */
837                 if (!done && c)
838                         ast_log(LOG_DEBUG, "Avoiding %s for '%s'\n", msg, c->name);
839                 AST_LIST_UNLOCK(&channels);
840                 if (done)
841                         return c;
842                 usleep(1);
843         }
844         /*
845          * c is surely not null, but we don't have the lock so cannot
846          * access c->name
847          */
848         ast_log(LOG_WARNING, "Avoided %s for '%p', %d retries!\n",
849                 msg, c, retries);
850
851         return NULL;
852 }
853
854 /*! \brief Browse channels in use */
855 struct ast_channel *ast_channel_walk_locked(const struct ast_channel *prev)
856 {
857         return channel_find_locked(prev, NULL, 0, NULL, NULL);
858 }
859
860 /*! \brief Get channel by name and lock it */
861 struct ast_channel *ast_get_channel_by_name_locked(const char *name)
862 {
863         return channel_find_locked(NULL, name, 0, NULL, NULL);
864 }
865
866 /*! \brief Get channel by name prefix and lock it */
867 struct ast_channel *ast_get_channel_by_name_prefix_locked(const char *name, const int namelen)
868 {
869         return channel_find_locked(NULL, name, namelen, NULL, NULL);
870 }
871
872 /*! \brief Get next channel by name prefix and lock it */
873 struct ast_channel *ast_walk_channel_by_name_prefix_locked(struct ast_channel *chan, const char *name, const int namelen)
874 {
875         return channel_find_locked(chan, name, namelen, NULL, NULL);
876 }
877
878 /*! \brief Get channel by exten (and optionally context) and lock it */
879 struct ast_channel *ast_get_channel_by_exten_locked(const char *exten, const char *context)
880 {
881         return channel_find_locked(NULL, NULL, 0, context, exten);
882 }
883
884 /*! \brief Wait, look for hangups and condition arg */
885 int ast_safe_sleep_conditional(struct ast_channel *chan, int ms, int (*cond)(void*), void *data)
886 {
887         struct ast_frame *f;
888
889         while (ms > 0) {
890                 if (cond && ((*cond)(data) == 0))
891                         return 0;
892                 ms = ast_waitfor(chan, ms);
893                 if (ms < 0)
894                         return -1;
895                 if (ms > 0) {
896                         f = ast_read(chan);
897                         if (!f)
898                                 return -1;
899                         ast_frfree(f);
900                 }
901         }
902         return 0;
903 }
904
905 /*! \brief Wait, look for hangups */
906 int ast_safe_sleep(struct ast_channel *chan, int ms)
907 {
908         return ast_safe_sleep_conditional(chan, ms, NULL, NULL);
909 }
910
911 static void free_cid(struct ast_callerid *cid)
912 {
913         if (cid->cid_dnid)
914                 free(cid->cid_dnid);
915         if (cid->cid_num)
916                 free(cid->cid_num);     
917         if (cid->cid_name)
918                 free(cid->cid_name);    
919         if (cid->cid_ani)
920                 free(cid->cid_ani);
921         if (cid->cid_rdnis)
922                 free(cid->cid_rdnis);
923 }
924
925 /*! \brief Free a channel structure */
926 void ast_channel_free(struct ast_channel *chan)
927 {
928         int fd;
929         struct ast_var_t *vardata;
930         struct ast_frame *f, *fp;
931         struct varshead *headp;
932         struct ast_datastore *datastore = NULL;
933         char name[AST_CHANNEL_NAME];
934         
935         headp=&chan->varshead;
936         
937         AST_LIST_LOCK(&channels);
938         AST_LIST_REMOVE(&channels, chan, chan_list);
939         /* Lock and unlock the channel just to be sure nobody
940            has it locked still */
941         ast_mutex_lock(&chan->lock);
942         ast_mutex_unlock(&chan->lock);
943         if (chan->tech_pvt) {
944                 ast_log(LOG_WARNING, "Channel '%s' may not have been hung up properly\n", chan->name);
945                 free(chan->tech_pvt);
946         }
947
948         if (chan->sched)
949                 sched_context_destroy(chan->sched);
950
951         ast_copy_string(name, chan->name, sizeof(name));
952
953         /* Stop monitoring */
954         if (chan->monitor) {
955                 chan->monitor->stop( chan, 0 );
956         }
957
958         /* If there is native format music-on-hold state, free it */
959         if(chan->music_state)
960                 ast_moh_cleanup(chan);
961
962         /* Free translators */
963         if (chan->readtrans)
964                 ast_translator_free_path(chan->readtrans);
965         if (chan->writetrans)
966                 ast_translator_free_path(chan->writetrans);
967         if (chan->pbx)
968                 ast_log(LOG_WARNING, "PBX may not have been terminated properly on '%s'\n", chan->name);
969         free_cid(&chan->cid);
970         ast_mutex_destroy(&chan->lock);
971         /* Close pipes if appropriate */
972         if ((fd = chan->alertpipe[0]) > -1)
973                 close(fd);
974         if ((fd = chan->alertpipe[1]) > -1)
975                 close(fd);
976         if ((fd = chan->timingfd) > -1)
977                 close(fd);
978         f = chan->readq;
979         chan->readq = NULL;
980         while(f) {
981                 fp = f;
982                 f = f->next;
983                 ast_frfree(fp);
984         }
985         
986         /* Get rid of each of the data stores on the channel */
987         while ((datastore = AST_LIST_REMOVE_HEAD(&chan->datastores, entry)))
988                 /* Free the data store */
989                 ast_channel_datastore_free(datastore);
990         AST_LIST_HEAD_INIT_NOLOCK(&chan->datastores);
991
992         /* loop over the variables list, freeing all data and deleting list items */
993         /* no need to lock the list, as the channel is already locked */
994         
995         while ((vardata = AST_LIST_REMOVE_HEAD(headp, entries)))
996                 ast_var_delete(vardata);
997
998         ast_string_field_free_all(chan);
999         free(chan);
1000         AST_LIST_UNLOCK(&channels);
1001
1002         ast_device_state_changed_literal(name);
1003 }
1004
1005 struct ast_datastore *ast_channel_datastore_alloc(const struct ast_datastore_info *info, char *uid)
1006 {
1007         struct ast_datastore *datastore = NULL;
1008
1009         /* Make sure we at least have type so we can identify this */
1010         if (info == NULL) {
1011                 return NULL;
1012         }
1013
1014         /* Allocate memory for datastore and clear it */
1015         datastore = ast_calloc(1, sizeof(*datastore));
1016         if (datastore == NULL) {
1017                 return NULL;
1018         }
1019
1020         datastore->info = info;
1021
1022         if (uid != NULL) {
1023                 datastore->uid = ast_strdup(uid);
1024         }
1025
1026         return datastore;
1027 }
1028
1029 int ast_channel_datastore_free(struct ast_datastore *datastore)
1030 {
1031         int res = 0;
1032
1033         /* Using the destroy function (if present) destroy the data */
1034         if (datastore->info->destroy != NULL && datastore->data != NULL) {
1035                 datastore->info->destroy(datastore->data);
1036                 datastore->data = NULL;
1037         }
1038
1039         /* Free allocated UID memory */
1040         if (datastore->uid != NULL) {
1041                 free(datastore->uid);
1042                 datastore->uid = NULL;
1043         }
1044
1045         /* Finally free memory used by ourselves */
1046         free(datastore);
1047         datastore = NULL;
1048
1049         return res;
1050 }
1051
1052 int ast_channel_datastore_add(struct ast_channel *chan, struct ast_datastore *datastore)
1053 {
1054         int res = 0;
1055
1056         AST_LIST_INSERT_HEAD(&chan->datastores, datastore, entry);
1057
1058         return res;
1059 }
1060
1061 int ast_channel_datastore_remove(struct ast_channel *chan, struct ast_datastore *datastore)
1062 {
1063         struct ast_datastore *datastore2 = NULL;
1064         int res = -1;
1065
1066         /* Find our position and remove ourselves */
1067         AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->datastores, datastore2, entry) {
1068                 if (datastore2 == datastore) {
1069                         AST_LIST_REMOVE_CURRENT(&chan->datastores, entry);
1070                         res = 0;
1071                         break;
1072                 }
1073         }
1074         AST_LIST_TRAVERSE_SAFE_END
1075
1076         return res;
1077 }
1078
1079 struct ast_datastore *ast_channel_datastore_find(struct ast_channel *chan, const struct ast_datastore_info *info, char *uid)
1080 {
1081         struct ast_datastore *datastore = NULL;
1082         
1083         if (info == NULL)
1084                 return NULL;
1085
1086         AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->datastores, datastore, entry) {
1087                 if (datastore->info == info) {
1088                         if (uid != NULL && datastore->uid != NULL) {
1089                                 if (!strcasecmp(uid, datastore->uid)) {
1090                                         /* Matched by type AND uid */
1091                                         break;
1092                                 }
1093                         } else {
1094                                 /* Matched by type at least */
1095                                 break;
1096                         }
1097                 }
1098         }
1099         AST_LIST_TRAVERSE_SAFE_END
1100
1101         return datastore;
1102 }
1103
1104 int ast_channel_spy_add(struct ast_channel *chan, struct ast_channel_spy *spy)
1105 {
1106         if (!ast_test_flag(spy, CHANSPY_FORMAT_AUDIO)) {
1107                 ast_log(LOG_WARNING, "Could not add channel spy '%s' to channel '%s', only audio format spies are supported.\n",
1108                         spy->type, chan->name);
1109                 return -1;
1110         }
1111
1112         if (ast_test_flag(spy, CHANSPY_READ_VOLADJUST) && (spy->read_queue.format != AST_FORMAT_SLINEAR)) {
1113                 ast_log(LOG_WARNING, "Cannot provide volume adjustment on '%s' format spies\n",
1114                         ast_getformatname(spy->read_queue.format));
1115                 return -1;
1116         }
1117
1118         if (ast_test_flag(spy, CHANSPY_WRITE_VOLADJUST) && (spy->write_queue.format != AST_FORMAT_SLINEAR)) {
1119                 ast_log(LOG_WARNING, "Cannot provide volume adjustment on '%s' format spies\n",
1120                         ast_getformatname(spy->write_queue.format));
1121                 return -1;
1122         }
1123
1124         if (ast_test_flag(spy, CHANSPY_MIXAUDIO) &&
1125             ((spy->read_queue.format != AST_FORMAT_SLINEAR) ||
1126              (spy->write_queue.format != AST_FORMAT_SLINEAR))) {
1127                 ast_log(LOG_WARNING, "Cannot provide audio mixing on '%s'-'%s' format spies\n",
1128                         ast_getformatname(spy->read_queue.format), ast_getformatname(spy->write_queue.format));
1129                 return -1;
1130         }
1131
1132         if (!chan->spies) {
1133                 if (!(chan->spies = ast_calloc(1, sizeof(*chan->spies)))) {
1134                         return -1;
1135                 }
1136
1137                 AST_LIST_HEAD_INIT_NOLOCK(&chan->spies->list);
1138                 AST_LIST_INSERT_HEAD(&chan->spies->list, spy, list);
1139         } else {
1140                 AST_LIST_INSERT_TAIL(&chan->spies->list, spy, list);
1141         }
1142
1143         if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE) {
1144                 ast_cond_init(&spy->trigger, NULL);
1145                 ast_set_flag(spy, CHANSPY_TRIGGER_READ);
1146                 ast_clear_flag(spy, CHANSPY_TRIGGER_WRITE);
1147         }
1148
1149         ast_log(LOG_DEBUG, "Spy %s added to channel %s\n",
1150                 spy->type, chan->name);
1151
1152         return 0;
1153 }
1154
1155 void ast_channel_spy_stop_by_type(struct ast_channel *chan, const char *type)
1156 {
1157         struct ast_channel_spy *spy;
1158         
1159         if (!chan->spies)
1160                 return;
1161
1162         AST_LIST_TRAVERSE(&chan->spies->list, spy, list) {
1163                 ast_mutex_lock(&spy->lock);
1164                 if ((spy->type == type) && (spy->status == CHANSPY_RUNNING)) {
1165                         spy->status = CHANSPY_STOP;
1166                         if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE)
1167                                 ast_cond_signal(&spy->trigger);
1168                 }
1169                 ast_mutex_unlock(&spy->lock);
1170         }
1171 }
1172
1173 void ast_channel_spy_trigger_wait(struct ast_channel_spy *spy)
1174 {
1175         ast_cond_wait(&spy->trigger, &spy->lock);
1176 }
1177
1178 void ast_channel_spy_remove(struct ast_channel *chan, struct ast_channel_spy *spy)
1179 {
1180         struct ast_frame *f;
1181
1182         if (!chan->spies)
1183                 return;
1184
1185         AST_LIST_REMOVE(&chan->spies->list, spy, list);
1186
1187         ast_mutex_lock(&spy->lock);
1188
1189         for (f = spy->read_queue.head; f; f = spy->read_queue.head) {
1190                 spy->read_queue.head = f->next;
1191                 ast_frfree(f);
1192         }
1193         for (f = spy->write_queue.head; f; f = spy->write_queue.head) {
1194                 spy->write_queue.head = f->next;
1195                 ast_frfree(f);
1196         }
1197
1198         if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE)
1199                 ast_cond_destroy(&spy->trigger);
1200
1201         ast_mutex_unlock(&spy->lock);
1202
1203         ast_log(LOG_DEBUG, "Spy %s removed from channel %s\n",
1204                 spy->type, chan->name);
1205
1206         if (AST_LIST_EMPTY(&chan->spies->list)) {
1207                 if (chan->spies->read_translator.path)
1208                         ast_translator_free_path(chan->spies->read_translator.path);
1209                 if (chan->spies->write_translator.path)
1210                         ast_translator_free_path(chan->spies->write_translator.path);
1211                 free(chan->spies);
1212                 chan->spies = NULL;
1213         }
1214 }
1215
1216 static void detach_spies(struct ast_channel *chan)
1217 {
1218         struct ast_channel_spy *spy;
1219
1220         if (!chan->spies)
1221                 return;
1222
1223         /* Marking the spies as done is sufficient.  Chanspy or spy users will get the picture. */
1224         AST_LIST_TRAVERSE(&chan->spies->list, spy, list) {
1225                 ast_mutex_lock(&spy->lock);
1226                 if (spy->status == CHANSPY_RUNNING)
1227                         spy->status = CHANSPY_DONE;
1228                 if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE)
1229                         ast_cond_signal(&spy->trigger);
1230                 ast_mutex_unlock(&spy->lock);
1231         }
1232
1233         AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->spies->list, spy, list)
1234                 ast_channel_spy_remove(chan, spy);
1235         AST_LIST_TRAVERSE_SAFE_END;
1236 }
1237
1238 /*! \brief Softly hangup a channel, don't lock */
1239 int ast_softhangup_nolock(struct ast_channel *chan, int cause)
1240 {
1241         if (option_debug)
1242                 ast_log(LOG_DEBUG, "Soft-Hanging up channel '%s'\n", chan->name);
1243         /* Inform channel driver that we need to be hung up, if it cares */
1244         chan->_softhangup |= cause;
1245         ast_queue_frame(chan, &ast_null_frame);
1246         /* Interrupt any poll call or such */
1247         if (ast_test_flag(chan, AST_FLAG_BLOCKING))
1248                 pthread_kill(chan->blocker, SIGURG);
1249         return 0;
1250 }
1251
1252 /*! \brief Softly hangup a channel, lock */
1253 int ast_softhangup(struct ast_channel *chan, int cause)
1254 {
1255         int res;
1256         ast_mutex_lock(&chan->lock);
1257         res = ast_softhangup_nolock(chan, cause);
1258         ast_mutex_unlock(&chan->lock);
1259         return res;
1260 }
1261
1262 enum spy_direction {
1263         SPY_READ,
1264         SPY_WRITE,
1265 };
1266
1267 #define SPY_QUEUE_SAMPLE_LIMIT 4000                     /* half of one second */
1268
1269 static void queue_frame_to_spies(struct ast_channel *chan, struct ast_frame *f, enum spy_direction dir)
1270 {
1271         struct ast_frame *translated_frame = NULL;
1272         struct ast_channel_spy *spy;
1273         struct ast_channel_spy_queue *queue;
1274         struct channel_spy_trans *trans;
1275         struct ast_frame *last;
1276
1277         trans = (dir == SPY_READ) ? &chan->spies->read_translator : &chan->spies->write_translator;
1278
1279         AST_LIST_TRAVERSE(&chan->spies->list, spy, list) {
1280                 ast_mutex_lock(&spy->lock);
1281
1282                 queue = (dir == SPY_READ) ? &spy->read_queue : &spy->write_queue;
1283
1284                 if ((queue->format == AST_FORMAT_SLINEAR) && (f->subclass != AST_FORMAT_SLINEAR)) {
1285                         if (!translated_frame) {
1286                                 if (trans->path && (trans->last_format != f->subclass)) {
1287                                         ast_translator_free_path(trans->path);
1288                                         trans->path = NULL;
1289                                 }
1290                                 if (!trans->path) {
1291                                         ast_log(LOG_DEBUG, "Building translator from %s to SLINEAR for spies on channel %s\n",
1292                                                 ast_getformatname(f->subclass), chan->name);
1293                                         if ((trans->path = ast_translator_build_path(AST_FORMAT_SLINEAR, f->subclass)) == NULL) {
1294                                                 ast_log(LOG_WARNING, "Cannot build a path from %s to %s\n",
1295                                                         ast_getformatname(f->subclass), ast_getformatname(AST_FORMAT_SLINEAR));
1296                                                 ast_mutex_unlock(&spy->lock);
1297                                                 continue;
1298                                         } else {
1299                                                 trans->last_format = f->subclass;
1300                                         }
1301                                 }
1302                                 if (!(translated_frame = ast_translate(trans->path, f, 0))) {
1303                                         ast_log(LOG_ERROR, "Translation to %s failed, dropping frame for spies\n",
1304                                                 ast_getformatname(AST_FORMAT_SLINEAR));
1305                                         ast_mutex_unlock(&spy->lock);
1306                                         break;
1307                                 }
1308                         }
1309
1310                         for (last = queue->head; last && last->next; last = last->next);
1311                         if (last)
1312                                 last->next = ast_frdup(translated_frame);
1313                         else
1314                                 queue->head = ast_frdup(translated_frame);
1315                 } else {
1316                         if (f->subclass != queue->format) {
1317                                 ast_log(LOG_WARNING, "Spy '%s' on channel '%s' wants format '%s', but frame is '%s', dropping\n",
1318                                         spy->type, chan->name,
1319                                         ast_getformatname(queue->format), ast_getformatname(f->subclass));
1320                                 ast_mutex_unlock(&spy->lock);
1321                                 continue;
1322                         }
1323
1324                         for (last = queue->head; last && last->next; last = last->next);
1325                         if (last)
1326                                 last->next = ast_frdup(f);
1327                         else
1328                                 queue->head = ast_frdup(f);
1329                 }
1330
1331                 queue->samples += f->samples;
1332
1333                 if (queue->samples > SPY_QUEUE_SAMPLE_LIMIT) {
1334                         if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE) {
1335                                 switch (ast_test_flag(spy, CHANSPY_TRIGGER_MODE)) {
1336                                 case CHANSPY_TRIGGER_READ:
1337                                         if (dir == SPY_WRITE) {
1338                                                 ast_set_flag(spy, CHANSPY_TRIGGER_WRITE);
1339                                                 ast_clear_flag(spy, CHANSPY_TRIGGER_READ);
1340                                                 if (option_debug)
1341                                                         ast_log(LOG_DEBUG, "Switching spy '%s' on '%s' to write-trigger mode\n",
1342                                                                 spy->type, chan->name);
1343                                         }
1344                                         break;
1345                                 case CHANSPY_TRIGGER_WRITE:
1346                                         if (dir == SPY_READ) {
1347                                                 ast_set_flag(spy, CHANSPY_TRIGGER_READ);
1348                                                 ast_clear_flag(spy, CHANSPY_TRIGGER_WRITE);
1349                                                 if (option_debug)
1350                                                         ast_log(LOG_DEBUG, "Switching spy '%s' on '%s' to read-trigger mode\n",
1351                                                                 spy->type, chan->name);
1352                                         }
1353                                         break;
1354                                 }
1355                                 if (option_debug)
1356                                         ast_log(LOG_DEBUG, "Triggering queue flush for spy '%s' on '%s'\n",
1357                                                 spy->type, chan->name);
1358                                 ast_set_flag(spy, CHANSPY_TRIGGER_FLUSH);
1359                                 ast_cond_signal(&spy->trigger);
1360                         } else {
1361                                 if (option_debug)
1362                                         ast_log(LOG_DEBUG, "Spy '%s' on channel '%s' %s queue too long, dropping frames\n",
1363                                                 spy->type, chan->name, (dir == SPY_READ) ? "read" : "write");
1364                                 while (queue->samples > SPY_QUEUE_SAMPLE_LIMIT) {
1365                                         struct ast_frame *drop = queue->head;
1366                                         
1367                                         queue->samples -= drop->samples;
1368                                         queue->head = drop->next;
1369                                         ast_frfree(drop);
1370                                 }
1371                         }
1372                 } else {
1373                         switch (ast_test_flag(spy, CHANSPY_TRIGGER_MODE)) {
1374                         case CHANSPY_TRIGGER_READ:
1375                                 if (dir == SPY_READ)
1376                                         ast_cond_signal(&spy->trigger);
1377                                 break;
1378                         case CHANSPY_TRIGGER_WRITE:
1379                                 if (dir == SPY_WRITE)
1380                                         ast_cond_signal(&spy->trigger);
1381                                 break;
1382                         }
1383                 }
1384
1385                 ast_mutex_unlock(&spy->lock);
1386         }
1387
1388         if (translated_frame)
1389                 ast_frfree(translated_frame);
1390 }
1391
1392 static void free_translation(struct ast_channel *clone)
1393 {
1394         if (clone->writetrans)
1395                 ast_translator_free_path(clone->writetrans);
1396         if (clone->readtrans)
1397                 ast_translator_free_path(clone->readtrans);
1398         clone->writetrans = NULL;
1399         clone->readtrans = NULL;
1400         clone->rawwriteformat = clone->nativeformats;
1401         clone->rawreadformat = clone->nativeformats;
1402 }
1403
1404 /*! \brief Hangup a channel */
1405 int ast_hangup(struct ast_channel *chan)
1406 {
1407         int res = 0;
1408
1409         /* Don't actually hang up a channel that will masquerade as someone else, or
1410            if someone is going to masquerade as us */
1411         ast_mutex_lock(&chan->lock);
1412
1413         detach_spies(chan);             /* get rid of spies */
1414
1415         if (chan->masq) {
1416                 if (ast_do_masquerade(chan))
1417                         ast_log(LOG_WARNING, "Failed to perform masquerade\n");
1418         }
1419
1420         if (chan->masq) {
1421                 ast_log(LOG_WARNING, "%s getting hung up, but someone is trying to masq into us?!?\n", chan->name);
1422                 ast_mutex_unlock(&chan->lock);
1423                 return 0;
1424         }
1425         /* If this channel is one which will be masqueraded into something,
1426            mark it as a zombie already, so we know to free it later */
1427         if (chan->masqr) {
1428                 ast_set_flag(chan, AST_FLAG_ZOMBIE);
1429                 ast_mutex_unlock(&chan->lock);
1430                 return 0;
1431         }
1432         free_translation(chan);
1433         if (chan->stream)               /* Close audio stream */
1434                 ast_closestream(chan->stream);
1435         if (chan->vstream)              /* Close video stream */
1436                 ast_closestream(chan->vstream);
1437         if (chan->sched) {
1438                 sched_context_destroy(chan->sched);
1439                 chan->sched = NULL;
1440         }
1441         
1442         if (chan->generatordata)        /* Clear any tone stuff remaining */
1443                 chan->generator->release(chan, chan->generatordata);
1444         chan->generatordata = NULL;
1445         chan->generator = NULL;
1446         if (chan->cdr) {                /* End the CDR if it hasn't already */
1447                 ast_cdr_end(chan->cdr);
1448                 ast_cdr_detach(chan->cdr);      /* Post and Free the CDR */
1449                 chan->cdr = NULL;
1450         }
1451         if (ast_test_flag(chan, AST_FLAG_BLOCKING)) {
1452                 ast_log(LOG_WARNING, "Hard hangup called by thread %ld on %s, while fd "
1453                                         "is blocked by thread %ld in procedure %s!  Expect a failure\n",
1454                                         (long)pthread_self(), chan->name, (long)chan->blocker, chan->blockproc);
1455                 CRASH;
1456         }
1457         if (!ast_test_flag(chan, AST_FLAG_ZOMBIE)) {
1458                 if (option_debug)
1459                         ast_log(LOG_DEBUG, "Hanging up channel '%s'\n", chan->name);
1460                 if (chan->tech->hangup)
1461                         res = chan->tech->hangup(chan);
1462         } else {
1463                 if (option_debug)
1464                         ast_log(LOG_DEBUG, "Hanging up zombie '%s'\n", chan->name);
1465         }
1466                         
1467         ast_mutex_unlock(&chan->lock);
1468         manager_event(EVENT_FLAG_CALL, "Hangup",
1469                         "Channel: %s\r\n"
1470                         "Uniqueid: %s\r\n"
1471                         "Cause: %d\r\n"
1472                         "Cause-txt: %s\r\n",
1473                         chan->name,
1474                         chan->uniqueid,
1475                         chan->hangupcause,
1476                         ast_cause2str(chan->hangupcause)
1477                         );
1478         ast_channel_free(chan);
1479         return res;
1480 }
1481
1482 int ast_answer(struct ast_channel *chan)
1483 {
1484         int res = 0;
1485         ast_mutex_lock(&chan->lock);
1486         /* Stop if we're a zombie or need a soft hangup */
1487         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
1488                 ast_mutex_unlock(&chan->lock);
1489                 return -1;
1490         }
1491         switch(chan->_state) {
1492         case AST_STATE_RINGING:
1493         case AST_STATE_RING:
1494                 if (chan->tech->answer)
1495                         res = chan->tech->answer(chan);
1496                 ast_setstate(chan, AST_STATE_UP);
1497                 if (chan->cdr)
1498                         ast_cdr_answer(chan->cdr);
1499                 ast_mutex_unlock(&chan->lock);
1500                 return res;
1501                 break;
1502         case AST_STATE_UP:
1503                 if (chan->cdr)
1504                         ast_cdr_answer(chan->cdr);
1505                 break;
1506         }
1507         ast_mutex_unlock(&chan->lock);
1508         return 0;
1509 }
1510
1511 void ast_deactivate_generator(struct ast_channel *chan)
1512 {
1513         ast_mutex_lock(&chan->lock);
1514         if (chan->generatordata) {
1515                 if (chan->generator && chan->generator->release)
1516                         chan->generator->release(chan, chan->generatordata);
1517                 chan->generatordata = NULL;
1518                 chan->generator = NULL;
1519                 chan->fds[AST_GENERATOR_FD] = -1;
1520                 ast_clear_flag(chan, AST_FLAG_WRITE_INT);
1521                 ast_settimeout(chan, 0, NULL, NULL);
1522         }
1523         ast_mutex_unlock(&chan->lock);
1524 }
1525
1526 static int generator_force(void *data)
1527 {
1528         /* Called if generator doesn't have data */
1529         void *tmp;
1530         int res;
1531         int (*generate)(struct ast_channel *chan, void *tmp, int datalen, int samples);
1532         struct ast_channel *chan = data;
1533         tmp = chan->generatordata;
1534         chan->generatordata = NULL;
1535         generate = chan->generator->generate;
1536         res = generate(chan, tmp, 0, 160);
1537         chan->generatordata = tmp;
1538         if (res) {
1539                 ast_log(LOG_DEBUG, "Auto-deactivating generator\n");
1540                 ast_deactivate_generator(chan);
1541         }
1542         return 0;
1543 }
1544
1545 int ast_activate_generator(struct ast_channel *chan, struct ast_generator *gen, void *params)
1546 {
1547         int res = 0;
1548
1549         ast_mutex_lock(&chan->lock);
1550
1551         if (chan->generatordata) {
1552                 if (chan->generator && chan->generator->release)
1553                         chan->generator->release(chan, chan->generatordata);
1554                 chan->generatordata = NULL;
1555         }
1556
1557         ast_prod(chan);
1558         if (gen->alloc && !(chan->generatordata = gen->alloc(chan, params))) {
1559                 res = -1;
1560         }
1561         
1562         if (!res) {
1563                 ast_settimeout(chan, 160, generator_force, chan);
1564                 chan->generator = gen;
1565         }
1566
1567         ast_mutex_unlock(&chan->lock);
1568
1569         return res;
1570 }
1571
1572 /*! \brief Wait for x amount of time on a file descriptor to have input.  */
1573 int ast_waitfor_n_fd(int *fds, int n, int *ms, int *exception)
1574 {
1575         int winner = -1;
1576         ast_waitfor_nandfds(NULL, 0, fds, n, exception, &winner, ms);
1577         return winner;
1578 }
1579
1580 /*! \brief Wait for x amount of time on a file descriptor to have input.  */
1581 struct ast_channel *ast_waitfor_nandfds(struct ast_channel **c, int n, int *fds, int nfds,
1582         int *exception, int *outfd, int *ms)
1583 {
1584         struct timeval start = { 0 , 0 };
1585         struct pollfd *pfds;
1586         int res;
1587         long rms;
1588         int x, y, max;
1589         int sz;
1590         time_t now = 0;
1591         long whentohangup = 0, diff;
1592         struct ast_channel *winner = NULL;
1593         struct fdmap {
1594                 int chan;
1595                 int fdno;
1596         } *fdmap;
1597
1598         sz = n * AST_MAX_FDS + nfds;
1599         if (!(pfds = alloca(sizeof(*pfds) * sz)) || !(fdmap = alloca(sizeof(*fdmap) * sz))) {
1600                 ast_log(LOG_ERROR, "Out of memory\n");
1601                 *outfd = -1;
1602                 return NULL;
1603         }
1604
1605         if (outfd)
1606                 *outfd = -99999;
1607         if (exception)
1608                 *exception = 0;
1609         
1610         /* Perform any pending masquerades */
1611         for (x=0; x < n; x++) {
1612                 ast_mutex_lock(&c[x]->lock);
1613                 if (c[x]->masq) {
1614                         if (ast_do_masquerade(c[x])) {
1615                                 ast_log(LOG_WARNING, "Masquerade failed\n");
1616                                 *ms = -1;
1617                                 ast_mutex_unlock(&c[x]->lock);
1618                                 return NULL;
1619                         }
1620                 }
1621                 if (c[x]->whentohangup) {
1622                         if (!whentohangup)
1623                                 time(&now);
1624                         diff = c[x]->whentohangup - now;
1625                         if (diff < 1) {
1626                                 /* Should already be hungup */
1627                                 c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
1628                                 ast_mutex_unlock(&c[x]->lock);
1629                                 return c[x];
1630                         }
1631                         if (!whentohangup || (diff < whentohangup))
1632                                 whentohangup = diff;
1633                 }
1634                 ast_mutex_unlock(&c[x]->lock);
1635         }
1636         /* Wait full interval */
1637         rms = *ms;
1638         if (whentohangup) {
1639                 rms = (whentohangup - now) * 1000;      /* timeout in milliseconds */
1640                 if (*ms >= 0 && *ms < rms)              /* original *ms still smaller */
1641                         rms =  *ms;
1642         }
1643         /*
1644          * Build the pollfd array, putting the channels' fds first,
1645          * followed by individual fds. Order is important because
1646          * individual fd's must have priority over channel fds.
1647          */
1648         max = 0;
1649         for (x=0; x<n; x++) {
1650                 for (y=0; y<AST_MAX_FDS; y++) {
1651                         fdmap[max].fdno = y;  /* fd y is linked to this pfds */
1652                         fdmap[max].chan = x;  /* channel x is linked to this pfds */
1653                         max += ast_add_fd(&pfds[max], c[x]->fds[y]);
1654                 }
1655                 CHECK_BLOCKING(c[x]);
1656         }
1657         /* Add the individual fds */
1658         for (x=0; x<nfds; x++) {
1659                 fdmap[max].chan = -1;
1660                 max += ast_add_fd(&pfds[max], fds[x]);
1661         }
1662
1663         if (*ms > 0)
1664                 start = ast_tvnow();
1665         
1666         if (sizeof(int) == 4) { /* XXX fix timeout > 600000 on linux x86-32 */
1667                 do {
1668                         int kbrms = rms;
1669                         if (kbrms > 600000)
1670                                 kbrms = 600000;
1671                         res = poll(pfds, max, kbrms);
1672                         if (!res)
1673                                 rms -= kbrms;
1674                 } while (!res && (rms > 0));
1675         } else {
1676                 res = poll(pfds, max, rms);
1677         }
1678         for (x=0; x<n; x++)
1679                 ast_clear_flag(c[x], AST_FLAG_BLOCKING);
1680         if (res < 0) { /* Simulate a timeout if we were interrupted */
1681                 if (errno != EINTR)
1682                         *ms = -1;
1683                 return NULL;
1684         }
1685         if (whentohangup) {   /* if we have a timeout, check who expired */
1686                 time(&now);
1687                 for (x=0; x<n; x++) {
1688                         if (c[x]->whentohangup && now >= c[x]->whentohangup) {
1689                                 c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
1690                                 if (winner == NULL)
1691                                         winner = c[x];
1692                         }
1693                 }
1694         }
1695         if (res == 0) { /* no fd ready, reset timeout and done */
1696                 *ms = 0;        /* XXX use 0 since we may not have an exact timeout. */
1697                 return winner;
1698         }
1699         /*
1700          * Then check if any channel or fd has a pending event.
1701          * Remember to check channels first and fds last, as they
1702          * must have priority on setting 'winner'
1703          */
1704         for (x = 0; x < max; x++) {
1705                 res = pfds[x].revents;
1706                 if (res == 0)
1707                         continue;
1708                 if (fdmap[x].chan >= 0) {       /* this is a channel */
1709                         winner = c[fdmap[x].chan];      /* override previous winners */
1710                         if (res & POLLPRI)
1711                                 ast_set_flag(winner, AST_FLAG_EXCEPTION);
1712                         else
1713                                 ast_clear_flag(winner, AST_FLAG_EXCEPTION);
1714                         winner->fdno = fdmap[x].fdno;
1715                 } else {                        /* this is an fd */
1716                         if (outfd)
1717                                 *outfd = pfds[x].fd;
1718                         if (exception)
1719                                 *exception = (res & POLLPRI) ? -1 : 0;
1720                         winner = NULL;
1721                 }
1722         }
1723         if (*ms > 0) {
1724                 *ms -= ast_tvdiff_ms(ast_tvnow(), start);
1725                 if (*ms < 0)
1726                         *ms = 0;
1727         }
1728         return winner;
1729 }
1730
1731 struct ast_channel *ast_waitfor_n(struct ast_channel **c, int n, int *ms)
1732 {
1733         return ast_waitfor_nandfds(c, n, NULL, 0, NULL, NULL, ms);
1734 }
1735
1736 int ast_waitfor(struct ast_channel *c, int ms)
1737 {
1738         int oldms = ms; /* -1 if no timeout */
1739
1740         ast_waitfor_nandfds(&c, 1, NULL, 0, NULL, NULL, &ms);
1741         if ((ms < 0) && (oldms < 0))
1742                 ms = 0;
1743         return ms;
1744 }
1745
1746 /* XXX never to be called with ms = -1 */
1747 int ast_waitfordigit(struct ast_channel *c, int ms)
1748 {
1749         /* XXX Should I be merged with waitfordigit_full XXX */
1750         struct ast_frame *f;
1751         int result = 0;
1752
1753         /* Stop if we're a zombie or need a soft hangup */
1754         if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
1755                 return -1;
1756
1757         /* Wait for a digit, no more than ms milliseconds total. */
1758         while(ms && !result) {
1759                 ms = ast_waitfor(c, ms);
1760                 if (ms < 0) /* Error */
1761                         result = -1;
1762                 else if (ms > 0) {
1763                         /* Read something */
1764                         f = ast_read(c);
1765                         if (f) {
1766                                 if (f->frametype == AST_FRAME_DTMF)
1767                                         result = f->subclass;
1768                                 ast_frfree(f);
1769                         } else
1770                                 result = -1;
1771                 }
1772         }
1773         return result;
1774 }
1775
1776 int ast_settimeout(struct ast_channel *c, int samples, int (*func)(void *data), void *data)
1777 {
1778         int res = -1;
1779 #ifdef ZAPTEL_OPTIMIZATIONS
1780         if (c->timingfd > -1) {
1781                 if (!func) {
1782                         samples = 0;
1783                         data = 0;
1784                 }
1785                 ast_log(LOG_DEBUG, "Scheduling timer at %d sample intervals\n", samples);
1786                 res = ioctl(c->timingfd, ZT_TIMERCONFIG, &samples);
1787                 c->timingfunc = func;
1788                 c->timingdata = data;
1789         }
1790 #endif  
1791         return res;
1792 }
1793
1794 int ast_waitfordigit_full(struct ast_channel *c, int ms, int audiofd, int cmdfd)
1795 {
1796         struct ast_frame *f;
1797         struct ast_channel *rchan;
1798         int outfd;
1799         int res;
1800
1801         /* Stop if we're a zombie or need a soft hangup */
1802         if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
1803                 return -1;
1804         /* Wait for a digit, no more than ms milliseconds total. */
1805         while(ms) {
1806                 errno = 0;
1807                 rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
1808                 if ((!rchan) && (outfd < 0) && (ms)) {
1809                         if (errno == 0 || errno == EINTR)
1810                                 continue;
1811                         ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
1812                         return -1;
1813                 } else if (outfd > -1) {
1814                         /* The FD we were watching has something waiting */
1815                         return 1;
1816                 } else if (rchan) {
1817                         f = ast_read(c);
1818                         if(!f) {
1819                                 return -1;
1820                         }
1821
1822                         switch(f->frametype) {
1823                         case AST_FRAME_DTMF:
1824                                 res = f->subclass;
1825                                 ast_frfree(f);
1826                                 return res;
1827                         case AST_FRAME_CONTROL:
1828                                 switch(f->subclass) {
1829                                 case AST_CONTROL_HANGUP:
1830                                         ast_frfree(f);
1831                                         return -1;
1832                                 case AST_CONTROL_RINGING:
1833                                 case AST_CONTROL_ANSWER:
1834                                         /* Unimportant */
1835                                         break;
1836                                 default:
1837                                         ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", f->subclass);
1838                                 }
1839                         case AST_FRAME_VOICE:
1840                                 /* Write audio if appropriate */
1841                                 if (audiofd > -1)
1842                                         write(audiofd, f->data, f->datalen);
1843                         }
1844                         /* Ignore */
1845                         ast_frfree(f);
1846                 }
1847         }
1848         return 0; /* Time is up */
1849 }
1850
1851 static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio)
1852 {
1853         struct ast_frame *f = NULL;
1854         int blah;
1855         int prestate;
1856 #ifdef ZAPTEL_OPTIMIZATIONS
1857         int (*func)(void *);
1858         void *data;
1859         int res;
1860 #endif
1861         ast_mutex_lock(&chan->lock);
1862         if (chan->masq) {
1863                 if (ast_do_masquerade(chan)) {
1864                         ast_log(LOG_WARNING, "Failed to perform masquerade\n");
1865                         f = NULL;
1866                 } else
1867                         f =  &ast_null_frame;
1868                 ast_mutex_unlock(&chan->lock);
1869                 return f;
1870         }
1871
1872         /* Stop if we're a zombie or need a soft hangup */
1873         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
1874                 if (chan->generator)
1875                         ast_deactivate_generator(chan);
1876                 ast_mutex_unlock(&chan->lock);
1877                 return NULL;
1878         }
1879         prestate = chan->_state;
1880
1881         if (!ast_test_flag(chan, AST_FLAG_DEFER_DTMF) && !ast_strlen_zero(chan->dtmfq)) {
1882                 /* We have DTMF that has been deferred.  Return it now */
1883                 chan->dtmff.frametype = AST_FRAME_DTMF;
1884                 chan->dtmff.subclass = chan->dtmfq[0];
1885                 /* Drop first digit */
1886                 memmove(chan->dtmfq, chan->dtmfq + 1, sizeof(chan->dtmfq) - 1);
1887                 ast_mutex_unlock(&chan->lock);
1888                 return &chan->dtmff;
1889         }
1890         
1891         /* Read and ignore anything on the alertpipe, but read only
1892            one sizeof(blah) per frame that we send from it */
1893         if (chan->alertpipe[0] > -1)
1894                 read(chan->alertpipe[0], &blah, sizeof(blah));
1895 #ifdef ZAPTEL_OPTIMIZATIONS
1896         if (chan->timingfd > -1 && chan->fdno == AST_TIMING_FD && ast_test_flag(chan, AST_FLAG_EXCEPTION)) {
1897                 ast_clear_flag(chan, AST_FLAG_EXCEPTION);
1898                 blah = -1;
1899                 /* IF we can't get event, assume it's an expired as-per the old interface */
1900                 res = ioctl(chan->timingfd, ZT_GETEVENT, &blah);
1901                 if (res)
1902                         blah = ZT_EVENT_TIMER_EXPIRED;
1903
1904                 if (blah == ZT_EVENT_TIMER_PING) {
1905                         if (!chan->readq || !chan->readq->next) {
1906                                 /* Acknowledge PONG unless we need it again */
1907                                 if (ioctl(chan->timingfd, ZT_TIMERPONG, &blah)) {
1908                                         ast_log(LOG_WARNING, "Failed to pong timer on '%s': %s\n", chan->name, strerror(errno));
1909                                 }
1910                         }
1911                 } else if (blah == ZT_EVENT_TIMER_EXPIRED) {
1912                         ioctl(chan->timingfd, ZT_TIMERACK, &blah);
1913                         func = chan->timingfunc;
1914                         data = chan->timingdata;
1915                         ast_mutex_unlock(&chan->lock);
1916                         if (func) {
1917 #if 0
1918                                 ast_log(LOG_DEBUG, "Calling private function\n");
1919 #endif                  
1920                                 func(data);
1921                         } else {
1922                                 blah = 0;
1923                                 ast_mutex_lock(&chan->lock);
1924                                 ioctl(chan->timingfd, ZT_TIMERCONFIG, &blah);
1925                                 chan->timingdata = NULL;
1926                                 ast_mutex_unlock(&chan->lock);
1927                         }
1928                         return &ast_null_frame;
1929                 } else
1930                         ast_log(LOG_NOTICE, "No/unknown event '%d' on timer for '%s'?\n", blah, chan->name);
1931         } else
1932 #endif
1933         /* Check for AST_GENERATOR_FD if not null.  If so, call generator with -1
1934            arguments now so it can do whatever it needs to. */
1935         if (chan->fds[AST_GENERATOR_FD] > -1 && chan->fdno == AST_GENERATOR_FD) {
1936                 void *tmp = chan->generatordata;
1937                 chan->generatordata = NULL;     /* reset to let ast_write get through */
1938                 chan->generator->generate(chan, tmp, -1, -1);
1939                 chan->generatordata = tmp;
1940                 return &ast_null_frame;
1941         }
1942
1943         /* Check for pending read queue */
1944         if (chan->readq) {
1945                 f = chan->readq;
1946                 chan->readq = f->next;
1947                 f->next = NULL;
1948                 /* Interpret hangup and return NULL */
1949                 if (f->frametype == AST_FRAME_CONTROL && f->subclass == AST_CONTROL_HANGUP) {
1950                         ast_frfree(f);
1951                         f = NULL;
1952                 }
1953         } else {
1954                 chan->blocker = pthread_self();
1955                 if (ast_test_flag(chan, AST_FLAG_EXCEPTION)) {
1956                         if (chan->tech->exception)
1957                                 f = chan->tech->exception(chan);
1958                         else {
1959                                 ast_log(LOG_WARNING, "Exception flag set on '%s', but no exception handler\n", chan->name);
1960                                 f = &ast_null_frame;
1961                         }
1962                         /* Clear the exception flag */
1963                         ast_clear_flag(chan, AST_FLAG_EXCEPTION);
1964                 } else {
1965                         if (chan->tech->read)
1966                                 f = chan->tech->read(chan);
1967                         else
1968                                 ast_log(LOG_WARNING, "No read routine on channel %s\n", chan->name);
1969                 }
1970         }
1971
1972         if (f) {
1973                 /* if the channel driver returned more than one frame, stuff the excess
1974                    into the readq for the next ast_read call
1975                 */
1976                 if (f->next) {
1977                         chan->readq = f->next;
1978                         f->next = NULL;
1979                 }
1980
1981                 switch (f->frametype) {
1982                 case AST_FRAME_CONTROL:
1983                         if (f->subclass == AST_CONTROL_ANSWER) {
1984                                 if (prestate == AST_STATE_UP) {
1985                                         ast_log(LOG_DEBUG, "Dropping duplicate answer!\n");
1986                                         f = &ast_null_frame;
1987                                 }
1988                                 /* Answer the CDR */
1989                                 ast_setstate(chan, AST_STATE_UP);
1990                                 ast_cdr_answer(chan->cdr);
1991                         }
1992                         break;
1993                 case AST_FRAME_DTMF:
1994                         ast_log(LOG_DTMF, "DTMF '%c' received on %s\n", f->subclass, chan->name);
1995                         if (ast_test_flag(chan, AST_FLAG_DEFER_DTMF)) {
1996                                 if (strlen(chan->dtmfq) < sizeof(chan->dtmfq) - 2)
1997                                         chan->dtmfq[strlen(chan->dtmfq)] = f->subclass;
1998                                 else
1999                                         ast_log(LOG_WARNING, "Dropping deferred DTMF digits on %s\n", chan->name);
2000                                 f = &ast_null_frame;
2001                         }
2002                         break;
2003                 case AST_FRAME_DTMF_BEGIN:
2004                         ast_log(LOG_DTMF, "DTMF begin '%c' received on %s\n", f->subclass, chan->name);
2005                         break;
2006                 case AST_FRAME_DTMF_END:
2007                         ast_log(LOG_DTMF, "DTMF end '%c' received on %s\n", f->subclass, chan->name);
2008                         break;
2009                 case AST_FRAME_VOICE:
2010                         if (dropaudio) {
2011                                 ast_frfree(f);
2012                                 f = &ast_null_frame;
2013                         } else if (!(f->subclass & chan->nativeformats)) {
2014                                 /* This frame can't be from the current native formats -- drop it on the
2015                                    floor */
2016                                 ast_log(LOG_NOTICE, "Dropping incompatible voice frame on %s of format %s since our native format has changed to %s\n",
2017                                         chan->name, ast_getformatname(f->subclass), ast_getformatname(chan->nativeformats));
2018                                 ast_frfree(f);
2019                                 f = &ast_null_frame;
2020                         } else {
2021                                 if (chan->spies)
2022                                         queue_frame_to_spies(chan, f, SPY_READ);
2023                                 
2024                                 if (chan->monitor && chan->monitor->read_stream ) {
2025 #ifndef MONITOR_CONSTANT_DELAY
2026                                         int jump = chan->outsmpl - chan->insmpl - 4 * f->samples;
2027                                         if (jump >= 0) {
2028                                                 if (ast_seekstream(chan->monitor->read_stream, jump + f->samples, SEEK_FORCECUR) == -1)
2029                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring read stream, synchronization between the files may be broken\n");
2030                                                 chan->insmpl += jump + 4 * f->samples;
2031                                         } else
2032                                                 chan->insmpl+= f->samples;
2033 #else
2034                                         int jump = chan->outsmpl - chan->insmpl;
2035                                         if (jump - MONITOR_DELAY >= 0) {
2036                                                 if (ast_seekstream(chan->monitor->read_stream, jump - f->samples, SEEK_FORCECUR) == -1)
2037                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring read stream, synchronization between the files may be broken\n");
2038                                                 chan->insmpl += jump;
2039                                         } else
2040                                                 chan->insmpl += f->samples;
2041 #endif
2042                                         if (chan->monitor->state == AST_MONITOR_RUNNING) {
2043                                                 if (ast_writestream(chan->monitor->read_stream, f) < 0)
2044                                                         ast_log(LOG_WARNING, "Failed to write data to channel monitor read stream\n");
2045                                         }
2046                                 }
2047
2048                                 if (chan->readtrans) {
2049                                         if (!(f = ast_translate(chan->readtrans, f, 1)))
2050                                                 f = &ast_null_frame;
2051                                 }
2052
2053                                 /* Run generator sitting on the line if timing device not available
2054                                 * and synchronous generation of outgoing frames is necessary       */
2055                                 if (chan->generatordata &&  !ast_internal_timing_enabled(chan)) {
2056                                         void *tmp;
2057                                         int res;
2058                                         int (*generate)(struct ast_channel *chan, void *tmp, int datalen, int samples);
2059
2060                                         if (chan->timingfunc) {
2061                                                 if (option_debug > 1)
2062                                                         ast_log(LOG_DEBUG, "Generator got voice, switching to phase locked mode\n");
2063                                                 ast_settimeout(chan, 0, NULL, NULL);
2064                                         }
2065
2066                                         tmp = chan->generatordata;
2067                                         chan->generatordata = NULL;
2068                                         generate = chan->generator->generate;
2069                                         res = generate(chan, tmp, f->datalen, f->samples);
2070                                         chan->generatordata = tmp;
2071                                         if (res) {
2072                                                 if (option_debug > 1)
2073                                                         ast_log(LOG_DEBUG, "Auto-deactivating generator\n");
2074                                                 ast_deactivate_generator(chan);
2075                                         }
2076
2077                                 } else if (f->frametype == AST_FRAME_CNG) {
2078                                         if (chan->generator && !chan->timingfunc && (chan->timingfd > -1)) {
2079                                                 if (option_debug > 1)
2080                                                         ast_log(LOG_DEBUG, "Generator got CNG, switching to timed mode\n");
2081                                                 ast_settimeout(chan, 160, generator_force, chan);
2082                                         }
2083                                 }
2084                         }
2085                 }
2086         } else {
2087                 /* Make sure we always return NULL in the future */
2088                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
2089                 if (chan->generator)
2090                         ast_deactivate_generator(chan);
2091                 /* End the CDR if appropriate */
2092                 if (chan->cdr)
2093                         ast_cdr_end(chan->cdr);
2094         }
2095
2096         /* High bit prints debugging */
2097         if (chan->fin & 0x80000000)
2098                 ast_frame_dump(chan->name, f, "<<");
2099         if ((chan->fin & 0x7fffffff) == 0x7fffffff)
2100                 chan->fin &= 0x80000000;
2101         else
2102                 chan->fin++;
2103         ast_mutex_unlock(&chan->lock);
2104
2105         return f;
2106 }
2107
2108 int ast_internal_timing_enabled(struct ast_channel *chan)
2109 {
2110         int ret = ast_opt_internal_timing && chan->timingfd > -1;
2111         if (option_debug > 3)
2112                 ast_log(LOG_DEBUG, "Internal timing is %s (option_internal_timing=%d chan->timingfd=%d)\n", ret? "enabled": "disabled", ast_opt_internal_timing, chan->timingfd);
2113         return ret;
2114 }
2115
2116 struct ast_frame *ast_read(struct ast_channel *chan)
2117 {
2118         return __ast_read(chan, 0);
2119 }
2120
2121 struct ast_frame *ast_read_noaudio(struct ast_channel *chan)
2122 {
2123         return __ast_read(chan, 1);
2124 }
2125
2126 int ast_indicate(struct ast_channel *chan, int condition)
2127 {
2128         int res = -1;
2129
2130         ast_mutex_lock(&chan->lock);
2131         /* Stop if we're a zombie or need a soft hangup */
2132         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
2133                 ast_mutex_unlock(&chan->lock);
2134                 return -1;
2135         }
2136         if (chan->tech->indicate)
2137                 res = chan->tech->indicate(chan, condition);
2138         ast_mutex_unlock(&chan->lock);
2139         if (!chan->tech->indicate || res) {
2140                 /*
2141                  * Device does not support (that) indication, lets fake
2142                  * it by doing our own tone generation. (PM2002)
2143                  */
2144                 if (condition >= 0) {
2145                         const struct tone_zone_sound *ts = NULL;
2146                         switch (condition) {
2147                         case AST_CONTROL_RINGING:
2148                                 ts = ast_get_indication_tone(chan->zone, "ring");
2149                                 break;
2150                         case AST_CONTROL_BUSY:
2151                                 ts = ast_get_indication_tone(chan->zone, "busy");
2152                                 break;
2153                         case AST_CONTROL_CONGESTION:
2154                                 ts = ast_get_indication_tone(chan->zone, "congestion");
2155                                 break;
2156                         }
2157                         if (ts && ts->data[0]) {
2158                                 ast_log(LOG_DEBUG, "Driver for channel '%s' does not support indication %d, emulating it\n", chan->name, condition);
2159                                 ast_playtones_start(chan,0,ts->data, 1);
2160                                 res = 0;
2161                         } else if (condition == AST_CONTROL_PROGRESS) {
2162                                 /* ast_playtones_stop(chan); */
2163                         } else if (condition == AST_CONTROL_PROCEEDING) {
2164                                 /* Do nothing, really */
2165                         } else if (condition == AST_CONTROL_HOLD) {
2166                                 /* Do nothing.... */
2167                         } else if (condition == AST_CONTROL_UNHOLD) {
2168                                 /* Do nothing.... */
2169                         } else if (condition == AST_CONTROL_VIDUPDATE) {
2170                                 /* Do nothing.... */
2171                         } else {
2172                                 /* not handled */
2173                                 ast_log(LOG_WARNING, "Unable to handle indication %d for '%s'\n", condition, chan->name);
2174                                 res = -1;
2175                         }
2176                 }
2177                 else ast_playtones_stop(chan);
2178         }
2179         return res;
2180 }
2181
2182 int ast_recvchar(struct ast_channel *chan, int timeout)
2183 {
2184         int c;
2185         char *buf = ast_recvtext(chan, timeout);
2186         if (buf == NULL)
2187                 return -1;      /* error or timeout */
2188         c = *(unsigned char *)buf;
2189         free(buf);
2190         return c;
2191 }
2192
2193 char *ast_recvtext(struct ast_channel *chan, int timeout)
2194 {
2195         int res, done = 0;
2196         char *buf = NULL;
2197         
2198         while (!done) {
2199                 struct ast_frame *f;
2200                 if (ast_check_hangup(chan))
2201                         break;
2202                 res = ast_waitfor(chan, timeout);
2203                 if (res <= 0) /* timeout or error */
2204                         break;
2205                 timeout = res;  /* update timeout */
2206                 f = ast_read(chan);
2207                 if (f == NULL)
2208                         break; /* no frame */
2209                 if (f->frametype == AST_FRAME_CONTROL && f->subclass == AST_CONTROL_HANGUP)
2210                         done = 1;       /* force a break */
2211                 else if (f->frametype == AST_FRAME_TEXT) {              /* what we want */
2212                         buf = ast_strndup((char *) f->data, f->datalen);        /* dup and break */
2213                         done = 1;
2214                 }
2215                 ast_frfree(f);
2216         }
2217         return buf;
2218 }
2219
2220 int ast_sendtext(struct ast_channel *chan, const char *text)
2221 {
2222         int res = 0;
2223         /* Stop if we're a zombie or need a soft hangup */
2224         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))
2225                 return -1;
2226         CHECK_BLOCKING(chan);
2227         if (chan->tech->send_text)
2228                 res = chan->tech->send_text(chan, text);
2229         ast_clear_flag(chan, AST_FLAG_BLOCKING);
2230         return res;
2231 }
2232
2233 static int do_senddigit(struct ast_channel *chan, char digit)
2234 {
2235         int res = -1;
2236
2237         if (chan->tech->send_digit)
2238                 res = chan->tech->send_digit(chan, digit);
2239         if (!(chan->tech->send_digit && chan->tech->send_digit_begin) ||
2240             res) {
2241                 /*
2242                  * Device does not support DTMF tones, lets fake
2243                  * it by doing our own generation. (PM2002)
2244                  */
2245                 static const char* dtmf_tones[] = {
2246                         "!941+1336/100,!0/100", /* 0 */
2247                         "!697+1209/100,!0/100", /* 1 */
2248                         "!697+1336/100,!0/100", /* 2 */
2249                         "!697+1477/100,!0/100", /* 3 */
2250                         "!770+1209/100,!0/100", /* 4 */
2251                         "!770+1336/100,!0/100", /* 5 */
2252                         "!770+1477/100,!0/100", /* 6 */
2253                         "!852+1209/100,!0/100", /* 7 */
2254                         "!852+1336/100,!0/100", /* 8 */
2255                         "!852+1477/100,!0/100", /* 9 */
2256                         "!697+1633/100,!0/100", /* A */
2257                         "!770+1633/100,!0/100", /* B */
2258                         "!852+1633/100,!0/100", /* C */
2259                         "!941+1633/100,!0/100", /* D */
2260                         "!941+1209/100,!0/100", /* * */
2261                         "!941+1477/100,!0/100" };       /* # */
2262                 if (digit >= '0' && digit <='9')
2263                         ast_playtones_start(chan, 0, dtmf_tones[digit-'0'], 0);
2264                 else if (digit >= 'A' && digit <= 'D')
2265                         ast_playtones_start(chan, 0, dtmf_tones[digit-'A'+10], 0);
2266                 else if (digit == '*')
2267                         ast_playtones_start(chan, 0, dtmf_tones[14], 0);
2268                 else if (digit == '#')
2269                         ast_playtones_start(chan, 0, dtmf_tones[15], 0);
2270                 else {
2271                         /* not handled */
2272                         ast_log(LOG_DEBUG, "Unable to generate DTMF tone '%c' for '%s'\n", digit, chan->name);
2273                 }
2274         }
2275         return 0;
2276 }
2277
2278 int ast_senddigit(struct ast_channel *chan, char digit)
2279 {
2280         return do_senddigit(chan, digit);
2281 }
2282
2283 int ast_prod(struct ast_channel *chan)
2284 {
2285         struct ast_frame a = { AST_FRAME_VOICE };
2286         char nothing[128];
2287
2288         /* Send an empty audio frame to get things moving */
2289         if (chan->_state != AST_STATE_UP) {
2290                 ast_log(LOG_DEBUG, "Prodding channel '%s'\n", chan->name);
2291                 a.subclass = chan->rawwriteformat;
2292                 a.data = nothing + AST_FRIENDLY_OFFSET;
2293                 a.src = "ast_prod";
2294                 if (ast_write(chan, &a))
2295                         ast_log(LOG_WARNING, "Prodding channel '%s' failed\n", chan->name);
2296         }
2297         return 0;
2298 }
2299
2300 int ast_write_video(struct ast_channel *chan, struct ast_frame *fr)
2301 {
2302         int res;
2303         if (!chan->tech->write_video)
2304                 return 0;
2305         res = ast_write(chan, fr);
2306         if (!res)
2307                 res = 1;
2308         return res;
2309 }
2310
2311 int ast_write(struct ast_channel *chan, struct ast_frame *fr)
2312 {
2313         int res = -1;
2314         struct ast_frame *f = NULL;
2315         /* Stop if we're a zombie or need a soft hangup */
2316         ast_mutex_lock(&chan->lock);
2317         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))  {
2318                 ast_mutex_unlock(&chan->lock);
2319                 return -1;
2320         }
2321         /* Handle any pending masquerades */
2322         if (chan->masq) {
2323                 if (ast_do_masquerade(chan)) {
2324                         ast_log(LOG_WARNING, "Failed to perform masquerade\n");
2325                         ast_mutex_unlock(&chan->lock);
2326                         return -1;
2327                 }
2328         }
2329         if (chan->masqr) {
2330                 ast_mutex_unlock(&chan->lock);
2331                 return 0;
2332         }
2333         if (chan->generatordata) {
2334                 if (ast_test_flag(chan, AST_FLAG_WRITE_INT))
2335                         ast_deactivate_generator(chan);
2336                 else {
2337                         ast_mutex_unlock(&chan->lock);
2338                         return 0;
2339                 }
2340         }
2341         /* High bit prints debugging */
2342         if (chan->fout & 0x80000000)
2343                 ast_frame_dump(chan->name, fr, ">>");
2344         CHECK_BLOCKING(chan);
2345         switch(fr->frametype) {
2346         case AST_FRAME_CONTROL:
2347                 /* XXX Interpret control frames XXX */
2348                 ast_log(LOG_WARNING, "Don't know how to handle control frames yet\n");
2349                 break;
2350         case AST_FRAME_DTMF_BEGIN:
2351                 if (chan->tech->send_digit_begin)
2352                         res = chan->tech->send_digit_begin(chan, fr->subclass);
2353                 else
2354                         res = 0;
2355                 break;
2356         case AST_FRAME_DTMF_END:
2357                 if (chan->tech->send_digit_end)
2358                         res = chan->tech->send_digit_end(chan);
2359                 else
2360                         res = 0;
2361                 break;
2362         case AST_FRAME_DTMF:
2363                 ast_clear_flag(chan, AST_FLAG_BLOCKING);
2364                 ast_mutex_unlock(&chan->lock);
2365                 res = do_senddigit(chan,fr->subclass);
2366                 ast_mutex_lock(&chan->lock);
2367                 CHECK_BLOCKING(chan);
2368                 break;
2369         case AST_FRAME_TEXT:
2370                 if (chan->tech->send_text)
2371                         res = chan->tech->send_text(chan, (char *) fr->data);
2372                 else
2373                         res = 0;
2374                 break;
2375         case AST_FRAME_HTML:
2376                 if (chan->tech->send_html)
2377                         res = chan->tech->send_html(chan, fr->subclass, (char *) fr->data, fr->datalen);
2378                 else
2379                         res = 0;
2380                 break;
2381         case AST_FRAME_VIDEO:
2382                 /* XXX Handle translation of video codecs one day XXX */
2383                 if (chan->tech->write_video)
2384                         res = chan->tech->write_video(chan, fr);
2385                 else
2386                         res = 0;
2387                 break;
2388         case AST_FRAME_VOICE:
2389                 if (chan->tech->write) {
2390                         /* Bypass translator if we're writing format in the raw write format.  This
2391                            allows mixing of native / non-native formats */
2392                         if (fr->subclass == chan->rawwriteformat)
2393                                 f = fr;
2394                         else
2395                                 f = (chan->writetrans) ? ast_translate(chan->writetrans, fr, 0) : fr;
2396                         if (f) {
2397                                 if (chan->spies)
2398                                         queue_frame_to_spies(chan, f, SPY_WRITE);
2399
2400                                 if (chan->monitor && chan->monitor->write_stream) {
2401 #ifndef MONITOR_CONSTANT_DELAY
2402                                         int jump = chan->insmpl - chan->outsmpl - 4 * f->samples;
2403                                         if (jump >= 0) {
2404                                                 if (ast_seekstream(chan->monitor->write_stream, jump + f->samples, SEEK_FORCECUR) == -1)
2405                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
2406                                                 chan->outsmpl += jump + 4 * f->samples;
2407                                         } else
2408                                                 chan->outsmpl += f->samples;
2409 #else
2410                                         int jump = chan->insmpl - chan->outsmpl;
2411                                         if (jump - MONITOR_DELAY >= 0) {
2412                                                 if (ast_seekstream(chan->monitor->write_stream, jump - f->samples, SEEK_FORCECUR) == -1)
2413                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
2414                                                 chan->outsmpl += jump;
2415                                         } else
2416                                                 chan->outsmpl += f->samples;
2417 #endif
2418                                         if (chan->monitor->state == AST_MONITOR_RUNNING) {
2419                                                 if (ast_writestream(chan->monitor->write_stream, f) < 0)
2420                                                         ast_log(LOG_WARNING, "Failed to write data to channel monitor write stream\n");
2421                                         }
2422                                 }
2423
2424                                 res = chan->tech->write(chan, f);
2425                         } else
2426                                 res = 0;
2427                 }
2428         }
2429
2430         if (f && (f != fr))
2431                 ast_frfree(f);
2432         ast_clear_flag(chan, AST_FLAG_BLOCKING);
2433         /* Consider a write failure to force a soft hangup */
2434         if (res < 0)
2435                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
2436         else {
2437                 if ((chan->fout & 0x7fffffff) == 0x7fffffff)
2438                         chan->fout &= 0x80000000;
2439                 else
2440                         chan->fout++;
2441         }
2442         ast_mutex_unlock(&chan->lock);
2443         return res;
2444 }
2445
2446 static int set_format(struct ast_channel *chan, int fmt, int *rawformat, int *format,
2447                       struct ast_trans_pvt **trans, const int direction)
2448 {
2449         int native;
2450         int res;
2451         
2452         /* Make sure we only consider audio */
2453         fmt &= AST_FORMAT_AUDIO_MASK;
2454         
2455         native = chan->nativeformats;
2456         /* Find a translation path from the native format to one of the desired formats */
2457         if (!direction)
2458                 /* reading */
2459                 res = ast_translator_best_choice(&fmt, &native);
2460         else
2461                 /* writing */
2462                 res = ast_translator_best_choice(&native, &fmt);
2463
2464         if (res < 0) {
2465                 ast_log(LOG_WARNING, "Unable to find a codec translation path from %s to %s\n",
2466                         ast_getformatname(native), ast_getformatname(fmt));
2467                 return -1;
2468         }
2469         
2470         /* Now we have a good choice for both. */
2471         ast_mutex_lock(&chan->lock);
2472         *rawformat = native;
2473         /* User perspective is fmt */
2474         *format = fmt;
2475         /* Free any read translation we have right now */
2476         if (*trans)
2477                 ast_translator_free_path(*trans);
2478         /* Build a translation path from the raw format to the desired format */
2479         if (!direction)
2480                 /* reading */
2481                 *trans = ast_translator_build_path(*format, *rawformat);
2482         else
2483                 /* writing */
2484                 *trans = ast_translator_build_path(*rawformat, *format);
2485         ast_mutex_unlock(&chan->lock);
2486         if (option_debug)
2487                 ast_log(LOG_DEBUG, "Set channel %s to %s format %s\n", chan->name,
2488                         direction ? "write" : "read", ast_getformatname(fmt));
2489         return 0;
2490 }
2491
2492 int ast_set_read_format(struct ast_channel *chan, int fmt)
2493 {
2494         return set_format(chan, fmt, &chan->rawreadformat, &chan->readformat,
2495                           &chan->readtrans, 0);
2496 }
2497
2498 int ast_set_write_format(struct ast_channel *chan, int fmt)
2499 {
2500         return set_format(chan, fmt, &chan->rawwriteformat, &chan->writeformat,
2501                           &chan->writetrans, 1);
2502 }
2503
2504 struct ast_channel *__ast_request_and_dial(const char *type, int format, void *data, int timeout, int *outstate, const char *cid_num, const char *cid_name, struct outgoing_helper *oh)
2505 {
2506         int state = 0;
2507         int cause = 0;
2508         struct ast_channel *chan;
2509         struct ast_frame *f;
2510         int res = 0;
2511         
2512         chan = ast_request(type, format, data, &cause);
2513         if (chan) {
2514                 if (oh) {
2515                         if (oh->vars)   
2516                                 ast_set_variables(chan, oh->vars);
2517                         if (oh->cid_num && *oh->cid_num && oh->cid_name && *oh->cid_name)
2518                                 ast_set_callerid(chan, oh->cid_num, oh->cid_name, oh->cid_num);
2519                         if (oh->parent_channel)
2520                                 ast_channel_inherit_variables(oh->parent_channel, chan);
2521                         if (oh->account)
2522                                 ast_cdr_setaccount(chan, oh->account);  
2523                 }
2524                 ast_set_callerid(chan, cid_num, cid_name, cid_num);
2525
2526                 if (!ast_call(chan, data, 0)) {
2527                         res = 1;        /* in case chan->_state is already AST_STATE_UP */
2528                         while (timeout && (chan->_state != AST_STATE_UP)) {
2529                                 res = ast_waitfor(chan, timeout);
2530                                 if (res < 0) {
2531                                         /* Something not cool, or timed out */
2532                                         break;
2533                                 }
2534                                 /* If done, break out */
2535                                 if (!res)
2536                                         break;
2537                                 if (timeout > -1)
2538                                         timeout = res;
2539                                 f = ast_read(chan);
2540                                 if (!f) {
2541                                         state = AST_CONTROL_HANGUP;
2542                                         res = 0;
2543                                         break;
2544                                 }
2545                                 if (f->frametype == AST_FRAME_CONTROL) {
2546                                         if (f->subclass == AST_CONTROL_RINGING)
2547                                                 state = AST_CONTROL_RINGING;
2548                                         else if ((f->subclass == AST_CONTROL_BUSY) || (f->subclass == AST_CONTROL_CONGESTION)) {
2549                                                 state = f->subclass;
2550                                                 ast_frfree(f);
2551                                                 break;
2552                                         } else if (f->subclass == AST_CONTROL_ANSWER) {
2553                                                 state = f->subclass;
2554                                                 ast_frfree(f);
2555                                                 break;
2556                                         } else if (f->subclass == AST_CONTROL_PROGRESS) {
2557                                                 /* Ignore */
2558                                         } else if (f->subclass == -1) {
2559                                                 /* Ignore -- just stopping indications */
2560                                         } else {
2561                                                 ast_log(LOG_NOTICE, "Don't know what to do with control frame %d\n", f->subclass);
2562                                         }
2563                                 }
2564                                 ast_frfree(f);
2565                         }
2566                 } else
2567                         ast_log(LOG_NOTICE, "Unable to call channel %s/%s\n", type, (char *)data);
2568         } else {
2569                 ast_log(LOG_NOTICE, "Unable to request channel %s/%s\n", type, (char *)data);
2570                 switch(cause) {
2571                 case AST_CAUSE_BUSY:
2572                         state = AST_CONTROL_BUSY;
2573                         break;
2574                 case AST_CAUSE_CONGESTION:
2575                         state = AST_CONTROL_CONGESTION;
2576                         break;
2577                 }
2578         }
2579         if (chan) {
2580                 /* Final fixups */
2581                 if (oh) {
2582                         if (oh->context && *oh->context)
2583                                 ast_copy_string(chan->context, oh->context, sizeof(chan->context));
2584                         if (oh->exten && *oh->exten)
2585                                 ast_copy_string(chan->exten, oh->exten, sizeof(chan->exten));
2586                         if (oh->priority)       
2587                                 chan->priority = oh->priority;
2588                 }
2589                 if (chan->_state == AST_STATE_UP)
2590                         state = AST_CONTROL_ANSWER;
2591         }
2592         if (outstate)
2593                 *outstate = state;
2594         if (chan && res <= 0) {
2595                 if (!chan->cdr && (chan->cdr = ast_cdr_alloc())) {
2596                         ast_cdr_init(chan->cdr, chan);
2597                 }
2598                 if (chan->cdr) {
2599                         char tmp[256];
2600                         snprintf(tmp, 256, "%s/%s", type, (char *)data);
2601                         ast_cdr_setapp(chan->cdr,"Dial",tmp);
2602                         ast_cdr_update(chan);
2603                         ast_cdr_start(chan->cdr);
2604                         ast_cdr_end(chan->cdr);
2605                         /* If the cause wasn't handled properly */
2606                         if (ast_cdr_disposition(chan->cdr,chan->hangupcause))
2607                                 ast_cdr_failed(chan->cdr);
2608                 }
2609                 ast_hangup(chan);
2610                 chan = NULL;
2611         }
2612         return chan;
2613 }
2614
2615 struct ast_channel *ast_request_and_dial(const char *type, int format, void *data, int timeout, int *outstate, const char *cidnum, const char *cidname)
2616 {
2617         return __ast_request_and_dial(type, format, data, timeout, outstate, cidnum, cidname, NULL);
2618 }
2619
2620 struct ast_channel *ast_request(const char *type, int format, void *data, int *cause)
2621 {
2622         struct chanlist *chan;
2623         struct ast_channel *c;
2624         int capabilities;
2625         int fmt;
2626         int res;
2627         int foo;
2628
2629         if (!cause)
2630                 cause = &foo;
2631         *cause = AST_CAUSE_NOTDEFINED;
2632
2633         if (AST_LIST_LOCK(&channels)) {
2634                 ast_log(LOG_WARNING, "Unable to lock channel list\n");
2635                 return NULL;
2636         }
2637
2638         AST_LIST_TRAVERSE(&backends, chan, list) {
2639                 if (strcasecmp(type, chan->tech->type))
2640                         continue;
2641
2642                 capabilities = chan->tech->capabilities;
2643                 fmt = format;
2644                 res = ast_translator_best_choice(&fmt, &capabilities);
2645                 if (res < 0) {
2646                         ast_log(LOG_WARNING, "No translator path exists for channel type %s (native %d) to %d\n", type, chan->tech->capabilities, format);
2647                         AST_LIST_UNLOCK(&channels);
2648                         return NULL;
2649                 }
2650                 AST_LIST_UNLOCK(&channels);
2651                 if (!chan->tech->requester)
2652                         return NULL;
2653                 
2654                 if (!(c = chan->tech->requester(type, capabilities, data, cause)))
2655                         return NULL;
2656
2657                 if (c->_state == AST_STATE_DOWN) {
2658                         manager_event(EVENT_FLAG_CALL, "Newchannel",
2659                                       "Channel: %s\r\n"
2660                                       "State: %s\r\n"
2661                                       "CallerID: %s\r\n"
2662                                       "CallerIDName: %s\r\n"
2663                                       "Uniqueid: %s\r\n",
2664                                       c->name, ast_state2str(c->_state),
2665                                       c->cid.cid_num ? c->cid.cid_num : "<unknown>",
2666                                       c->cid.cid_name ? c->cid.cid_name : "<unknown>",
2667                                       c->uniqueid);
2668                 }
2669                 return c;
2670         }
2671
2672         ast_log(LOG_WARNING, "No channel type registered for '%s'\n", type);
2673         *cause = AST_CAUSE_NOSUCHDRIVER;
2674         AST_LIST_UNLOCK(&channels);
2675
2676         return NULL;
2677 }
2678
2679 int ast_call(struct ast_channel *chan, char *addr, int timeout)
2680 {
2681         /* Place an outgoing call, but don't wait any longer than timeout ms before returning.
2682            If the remote end does not answer within the timeout, then do NOT hang up, but
2683            return anyway.  */
2684         int res = -1;
2685         /* Stop if we're a zombie or need a soft hangup */
2686         ast_mutex_lock(&chan->lock);
2687         if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan))
2688                 if (chan->tech->call)
2689                         res = chan->tech->call(chan, addr, timeout);
2690         ast_mutex_unlock(&chan->lock);
2691         return res;
2692 }
2693
2694 /*!
2695   \brief Transfer a call to dest, if the channel supports transfer
2696
2697   Called by:
2698     \arg app_transfer
2699     \arg the manager interface
2700 */
2701 int ast_transfer(struct ast_channel *chan, char *dest)
2702 {
2703         int res = -1;
2704
2705         /* Stop if we're a zombie or need a soft hangup */
2706         ast_mutex_lock(&chan->lock);
2707         if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan)) {
2708                 if (chan->tech->transfer) {
2709                         res = chan->tech->transfer(chan, dest);
2710                         if (!res)
2711                                 res = 1;
2712                 } else
2713                         res = 0;
2714         }
2715         ast_mutex_unlock(&chan->lock);
2716         return res;
2717 }
2718
2719 int ast_readstring(struct ast_channel *c, char *s, int len, int timeout, int ftimeout, char *enders)
2720 {
2721         int pos=0;
2722         int to = ftimeout;
2723         int d;
2724
2725         /* XXX Merge with full version? XXX */
2726         /* Stop if we're a zombie or need a soft hangup */
2727         if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
2728                 return -1;
2729         if (!len)
2730                 return -1;
2731         for (;;) {
2732                 if (c->stream) {
2733                         d = ast_waitstream(c, AST_DIGIT_ANY);
2734                         ast_stopstream(c);
2735                         usleep(1000);
2736                         if (!d)
2737                                 d = ast_waitfordigit(c, to);
2738                 } else {
2739                         d = ast_waitfordigit(c, to);
2740                 }
2741                 if (d < 0)
2742                         return -1;
2743                 if (d == 0) {
2744                         s[pos]='\0';
2745                         return 1;
2746                 }
2747                 if (!strchr(enders, d))
2748                         s[pos++] = d;
2749                 if (strchr(enders, d) || (pos >= len)) {
2750                         s[pos]='\0';
2751                         return 0;
2752                 }
2753                 to = timeout;
2754         }
2755         /* Never reached */
2756         return 0;
2757 }
2758
2759 int ast_readstring_full(struct ast_channel *c, char *s, int len, int timeout, int ftimeout, char *enders, int audiofd, int ctrlfd)
2760 {
2761         int pos=0;
2762         int to = ftimeout;
2763         int d;
2764
2765         /* Stop if we're a zombie or need a soft hangup */
2766         if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
2767                 return -1;
2768         if (!len)
2769                 return -1;
2770         for (;;) {
2771                 if (c->stream) {
2772                         d = ast_waitstream_full(c, AST_DIGIT_ANY, audiofd, ctrlfd);
2773                         ast_stopstream(c);
2774                         usleep(1000);
2775                         if (!d)
2776                                 d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
2777                 } else {
2778                         d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
2779                 }
2780                 if (d < 0)
2781                         return -1;
2782                 if (d == 0) {
2783                         s[pos]='\0';
2784                         return 1;
2785                 }
2786                 if (d == 1) {
2787                         s[pos]='\0';
2788                         return 2;
2789                 }
2790                 if (!strchr(enders, d))
2791                         s[pos++] = d;
2792                 if (strchr(enders, d) || (pos >= len)) {
2793                         s[pos]='\0';
2794                         return 0;
2795                 }
2796                 to = timeout;
2797         }
2798         /* Never reached */
2799         return 0;
2800 }
2801
2802 int ast_channel_supports_html(struct ast_channel *chan)
2803 {
2804         return (chan->tech->send_html) ? 1 : 0;
2805 }
2806
2807 int ast_channel_sendhtml(struct ast_channel *chan, int subclass, const char *data, int datalen)
2808 {
2809         if (chan->tech->send_html)
2810                 return chan->tech->send_html(chan, subclass, data, datalen);
2811         return -1;
2812 }
2813
2814 int ast_channel_sendurl(struct ast_channel *chan, const char *url)
2815 {
2816         return ast_channel_sendhtml(chan, AST_HTML_URL, url, strlen(url) + 1);
2817 }
2818
2819 int ast_channel_make_compatible(struct ast_channel *chan, struct ast_channel *peer)
2820 {
2821         int src;
2822         int dst;
2823
2824         /* Set up translation from the chan to the peer */
2825         src = chan->nativeformats;
2826         dst = peer->nativeformats;
2827         if (ast_translator_best_choice(&dst, &src) < 0) {
2828                 ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", chan->name, src, peer->name, dst);
2829                 return -1;
2830         }
2831
2832         /* if the best path is not 'pass through', then
2833            transcoding is needed; if desired, force transcode path
2834            to use SLINEAR between channels */
2835         if ((src != dst) && ast_opt_transcode_via_slin)
2836                 dst = AST_FORMAT_SLINEAR;
2837         if (ast_set_read_format(chan, dst) < 0) {
2838                 ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", chan->name, dst);
2839                 return -1;
2840         }
2841         if (ast_set_write_format(peer, dst) < 0) {
2842                 ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", peer->name, dst);
2843                 return -1;
2844         }
2845
2846         /* Set up translation from the peer to the chan */
2847         src = peer->nativeformats;
2848         dst = chan->nativeformats;
2849         if (ast_translator_best_choice(&dst, &src) < 0) {
2850                 ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", peer->name, src, chan->name, dst);
2851                 return -1;
2852         }
2853         /* if the best path is not 'pass through', then
2854            transcoding is needed; if desired, force transcode path
2855            to use SLINEAR between channels */
2856         if ((src != dst) && ast_opt_transcode_via_slin)
2857                 dst = AST_FORMAT_SLINEAR;
2858         if (ast_set_read_format(peer, dst) < 0) {
2859                 ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", peer->name, dst);
2860                 return -1;
2861         }
2862         if (ast_set_write_format(chan, dst) < 0) {
2863                 ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", chan->name, dst);
2864                 return -1;
2865         }
2866         return 0;
2867 }
2868
2869 int ast_channel_masquerade(struct ast_channel *original, struct ast_channel *clone)
2870 {
2871         int res = -1;
2872
2873         if (original == clone) {
2874                 ast_log(LOG_WARNING, "Can't masquerade channel '%s' into itself!\n", original->name);
2875                 return -1;
2876         }
2877         ast_mutex_lock(&original->lock);
2878         while(ast_mutex_trylock(&clone->lock)) {
2879                 ast_mutex_unlock(&original->lock);
2880                 usleep(1);
2881                 ast_mutex_lock(&original->lock);
2882         }
2883         ast_log(LOG_DEBUG, "Planning to masquerade channel %s into the structure of %s\n",
2884                 clone->name, original->name);
2885         if (original->masq) {
2886                 ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
2887                         original->masq->name, original->name);
2888         } else if (clone->masqr) {
2889                 ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
2890                         clone->name, clone->masqr->name);
2891         } else {
2892                 original->masq = clone;
2893                 clone->masqr = original;
2894                 ast_queue_frame(original, &ast_null_frame);
2895                 ast_queue_frame(clone, &ast_null_frame);
2896                 ast_log(LOG_DEBUG, "Done planning to masquerade channel %s into the structure of %s\n", clone->name, original->name);
2897                 res = 0;
2898         }
2899         ast_mutex_unlock(&clone->lock);
2900         ast_mutex_unlock(&original->lock);
2901         return res;
2902 }
2903
2904 void ast_change_name(struct ast_channel *chan, char *newname)
2905 {
2906         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", chan->name, newname, chan->uniqueid);
2907         ast_string_field_set(chan, name, newname);
2908 }
2909
2910 void ast_channel_inherit_variables(const struct ast_channel *parent, struct ast_channel *child)
2911 {
2912         struct ast_var_t *current, *newvar;
2913         const char *varname;
2914
2915         AST_LIST_TRAVERSE(&parent->varshead, current, entries) {
2916                 int vartype = 0;
2917
2918                 varname = ast_var_full_name(current);
2919                 if (!varname)
2920                         continue;
2921
2922                 if (varname[0] == '_') {
2923                         vartype = 1;
2924                         if (varname[1] == '_')
2925                                 vartype = 2;
2926                 }
2927
2928                 switch (vartype) {
2929                 case 1:
2930                         newvar = ast_var_assign(&varname[1], ast_var_value(current));
2931                         if (newvar) {
2932                                 AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
2933                                 if (option_debug)
2934                                         ast_log(LOG_DEBUG, "Copying soft-transferable variable %s.\n", ast_var_name(newvar));
2935                         }
2936                         break;
2937                 case 2:
2938                         newvar = ast_var_assign(ast_var_full_name(current), ast_var_value(current));
2939                         if (newvar) {
2940                                 AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
2941                                 if (option_debug)
2942                                         ast_log(LOG_DEBUG, "Copying hard-transferable variable %s.\n", ast_var_name(newvar));
2943                         }
2944                         break;
2945                 default:
2946                         if (option_debug)
2947                                 ast_log(LOG_DEBUG, "Not copying variable %s.\n", ast_var_name(current));
2948                         break;
2949                 }
2950         }
2951 }
2952
2953 /*!
2954   \brief Clone channel variables from 'clone' channel into 'original' channel
2955
2956   All variables except those related to app_groupcount are cloned.
2957   Variables are actually _removed_ from 'clone' channel, presumably
2958   because it will subsequently be destroyed.
2959
2960   \note Assumes locks will be in place on both channels when called.
2961 */
2962 static void clone_variables(struct ast_channel *original, struct ast_channel *clone)
2963 {
2964         struct ast_var_t *varptr;
2965
2966         /* we need to remove all app_groupcount related variables from the original
2967            channel before merging in the clone's variables; any groups assigned to the
2968            original channel should be released, only those assigned to the clone
2969            should remain
2970         */
2971
2972         AST_LIST_TRAVERSE_SAFE_BEGIN(&original->varshead, varptr, entries) {
2973                 if (!strncmp(ast_var_name(varptr), GROUP_CATEGORY_PREFIX, strlen(GROUP_CATEGORY_PREFIX))) {
2974                         AST_LIST_REMOVE(&original->varshead, varptr, entries);
2975                         ast_var_delete(varptr);
2976                 }
2977         }
2978         AST_LIST_TRAVERSE_SAFE_END;
2979
2980         /* Append variables from clone channel into original channel */
2981         /* XXX Is this always correct?  We have to in order to keep MACROS working XXX */
2982         if (AST_LIST_FIRST(&clone->varshead))
2983                 AST_LIST_INSERT_TAIL(&original->varshead, AST_LIST_FIRST(&clone->varshead), entries);
2984 }
2985
2986 /*!
2987   \brief Masquerade a channel
2988
2989   \note Assumes channel will be locked when called
2990 */
2991 int ast_do_masquerade(struct ast_channel *original)
2992 {
2993         int x,i;
2994         int res=0;
2995         int origstate;
2996         struct ast_frame *cur, *prev;
2997         const struct ast_channel_tech *t;
2998         void *t_pvt;
2999         struct ast_callerid tmpcid;
3000         struct ast_channel *clone = original->masq;
3001         int rformat = original->readformat;
3002         int wformat = original->writeformat;
3003         char newn[100];
3004         char orig[100];
3005         char masqn[100];
3006         char zombn[100];
3007
3008         if (option_debug > 3)
3009                 ast_log(LOG_DEBUG, "Actually Masquerading %s(%d) into the structure of %s(%d)\n",
3010                         clone->name, clone->_state, original->name, original->_state);
3011
3012         /* XXX This is a seriously wacked out operation.  We're essentially putting the guts of
3013            the clone channel into the original channel.  Start by killing off the original
3014            channel's backend.   I'm not sure we're going to keep this function, because
3015            while the features are nice, the cost is very high in terms of pure nastiness. XXX */
3016
3017         /* We need the clone's lock, too */
3018         ast_mutex_lock(&clone->lock);
3019
3020         ast_log(LOG_DEBUG, "Got clone lock for masquerade on '%s' at %p\n", clone->name, &clone->lock);
3021
3022         /* Having remembered the original read/write formats, we turn off any translation on either
3023            one */
3024         free_translation(clone);
3025         free_translation(original);
3026
3027
3028         /* Unlink the masquerade */
3029         original->masq = NULL;
3030         clone->masqr = NULL;
3031         
3032         /* Save the original name */
3033         ast_copy_string(orig, original->name, sizeof(orig));
3034         /* Save the new name */
3035         ast_copy_string(newn, clone->name, sizeof(newn));
3036         /* Create the masq name */
3037         snprintf(masqn, sizeof(masqn), "%s<MASQ>", newn);
3038                 
3039         /* Copy the name from the clone channel */
3040         ast_string_field_set(original, name, newn);
3041
3042         /* Mangle the name of the clone channel */
3043         ast_string_field_set(clone, name, masqn);
3044         
3045         /* Notify any managers of the change, first the masq then the other */
3046         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", newn, masqn, clone->uniqueid);
3047         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", orig, newn, original->uniqueid);
3048
3049         /* Swap the technologies */     
3050         t = original->tech;
3051         original->tech = clone->tech;
3052         clone->tech = t;
3053
3054         t_pvt = original->tech_pvt;
3055         original->tech_pvt = clone->tech_pvt;
3056         clone->tech_pvt = t_pvt;
3057
3058         /* Swap the readq's */
3059         cur = original->readq;
3060         original->readq = clone->readq;
3061         clone->readq = cur;
3062
3063         /* Swap the alertpipes */
3064         for (i = 0; i < 2; i++) {
3065                 x = original->alertpipe[i];
3066                 original->alertpipe[i] = clone->alertpipe[i];
3067                 clone->alertpipe[i] = x;
3068         }
3069
3070         /* Swap the raw formats */
3071         x = original->rawreadformat;
3072         original->rawreadformat = clone->rawreadformat;
3073         clone->rawreadformat = x;
3074         x = original->rawwriteformat;
3075         original->rawwriteformat = clone->rawwriteformat;
3076         clone->rawwriteformat = x;
3077
3078         /* Save any pending frames on both sides.  Start by counting
3079          * how many we're going to need... */
3080         prev = NULL;
3081         x = 0;
3082         for (cur = clone->readq; cur; cur = cur->next) {
3083                 x++;
3084                 prev = cur;
3085         }
3086         /* If we had any, prepend them to the ones already in the queue, and
3087          * load up the alertpipe */
3088         if (prev) {
3089                 prev->next = original->readq;
3090                 original->readq = clone->readq;
3091                 clone->readq = NULL;
3092                 if (original->alertpipe[1] > -1) {
3093                         for (i = 0; i < x; i++)
3094                                 write(original->alertpipe[1], &x, sizeof(x));
3095                 }
3096         }
3097         clone->_softhangup = AST_SOFTHANGUP_DEV;
3098
3099
3100         /* And of course, so does our current state.  Note we need not
3101            call ast_setstate since the event manager doesn't really consider
3102            these separate.  We do this early so that the clone has the proper
3103            state of the original channel. */
3104         origstate = original->_state;
3105         original->_state = clone->_state;
3106         clone->_state = origstate;
3107
3108         if (clone->tech->fixup){
3109                 res = clone->tech->fixup(original, clone);
3110                 if (res)
3111                         ast_log(LOG_WARNING, "Fixup failed on channel %s, strange things may happen.\n", clone->name);
3112         }
3113
3114         /* Start by disconnecting the original's physical side */
3115         if (clone->tech->hangup)
3116                 res = clone->tech->hangup(clone);
3117         if (res) {
3118                 ast_log(LOG_WARNING, "Hangup failed!  Strange things may happen!\n");
3119                 ast_mutex_unlock(&clone->lock);
3120                 return -1;
3121         }
3122         
3123         snprintf(zombn, sizeof(zombn), "%s<ZOMBIE>", orig);
3124         /* Mangle the name of the clone channel */
3125         ast_string_field_set(clone, name, zombn);
3126         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", masqn, zombn, clone->uniqueid);
3127
3128         /* Update the type. */
3129         t_pvt = original->monitor;
3130         original->monitor = clone->monitor;
3131         clone->monitor = t_pvt;
3132         
3133         /* Keep the same language.  */
3134         ast_string_field_set(original, language, clone->language);
3135         /* Copy the FD's other than the generator fd */
3136         for (x = 0; x < AST_MAX_FDS; x++) {
3137                 if (x != AST_GENERATOR_FD)
3138