- Fixes to ast_channel_lock functions
[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_channel_lock(chan);
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_channel_unlock(chan);
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_channel_unlock(chan);
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_channel_unlock(chan);
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_channel_lock(chan);
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_channel_unlock(chan);
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_channel_unlock(chan);
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_channel_lock(chan);
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_channel_unlock(chan);
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_channel_lock(c[x]);
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_channel_unlock(c[x]);
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_channel_unlock(c[x]);
1629                                 return c[x];
1630                         }
1631                         if (!whentohangup || (diff < whentohangup))
1632                                 whentohangup = diff;
1633                 }
1634                 ast_channel_unlock(c[x]);
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         return ast_waitfordigit_full(c, ms, -1, -1);
1750 }
1751
1752 int ast_settimeout(struct ast_channel *c, int samples, int (*func)(void *data), void *data)
1753 {
1754         int res = -1;
1755 #ifdef ZAPTEL_OPTIMIZATIONS
1756         if (c->timingfd > -1) {
1757                 if (!func) {
1758                         samples = 0;
1759                         data = 0;
1760                 }
1761                 ast_log(LOG_DEBUG, "Scheduling timer at %d sample intervals\n", samples);
1762                 res = ioctl(c->timingfd, ZT_TIMERCONFIG, &samples);
1763                 c->timingfunc = func;
1764                 c->timingdata = data;
1765         }
1766 #endif  
1767         return res;
1768 }
1769
1770 int ast_waitfordigit_full(struct ast_channel *c, int ms, int audiofd, int cmdfd)
1771 {
1772
1773         /* Stop if we're a zombie or need a soft hangup */
1774         if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
1775                 return -1;
1776         /* Wait for a digit, no more than ms milliseconds total. */
1777         while (ms) {
1778                 struct ast_channel *rchan;
1779                 int outfd;
1780
1781                 errno = 0;
1782                 rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
1783                 if (!rchan && outfd < 0 && ms) {
1784                         if (errno == 0 || errno == EINTR)
1785                                 continue;
1786                         ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
1787                         return -1;
1788                 } else if (outfd > -1) {
1789                         /* The FD we were watching has something waiting */
1790                         return 1;
1791                 } else if (rchan) {
1792                         int res;
1793                         struct ast_frame *f = ast_read(c);
1794                         if (!f)
1795                                 return -1;
1796
1797                         switch(f->frametype) {
1798                         case AST_FRAME_DTMF:
1799                                 res = f->subclass;
1800                                 ast_frfree(f);
1801                                 return res;
1802                         case AST_FRAME_CONTROL:
1803                                 switch(f->subclass) {
1804                                 case AST_CONTROL_HANGUP:
1805                                         ast_frfree(f);
1806                                         return -1;
1807                                 case AST_CONTROL_RINGING:
1808                                 case AST_CONTROL_ANSWER:
1809                                         /* Unimportant */
1810                                         break;
1811                                 default:
1812                                         ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", f->subclass);
1813                                 }
1814                         case AST_FRAME_VOICE:
1815                                 /* Write audio if appropriate */
1816                                 if (audiofd > -1)
1817                                         write(audiofd, f->data, f->datalen);
1818                         }
1819                         /* Ignore */
1820                         ast_frfree(f);
1821                 }
1822         }
1823         return 0; /* Time is up */
1824 }
1825
1826 static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio)
1827 {
1828         struct ast_frame *f = NULL;
1829         int blah;
1830         int prestate;
1831 #ifdef ZAPTEL_OPTIMIZATIONS
1832         int (*func)(void *);
1833         void *data;
1834         int res;
1835 #endif
1836         ast_channel_lock(chan);
1837         if (chan->masq) {
1838                 if (ast_do_masquerade(chan)) {
1839                         ast_log(LOG_WARNING, "Failed to perform masquerade\n");
1840                         f = NULL;
1841                 } else
1842                         f =  &ast_null_frame;
1843                 ast_channel_unlock(chan);
1844                 return f;
1845         }
1846
1847         /* Stop if we're a zombie or need a soft hangup */
1848         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
1849                 if (chan->generator)
1850                         ast_deactivate_generator(chan);
1851                 ast_channel_unlock(chan);
1852                 return NULL;
1853         }
1854         prestate = chan->_state;
1855
1856         if (!ast_test_flag(chan, AST_FLAG_DEFER_DTMF) && !ast_strlen_zero(chan->dtmfq)) {
1857                 /* We have DTMF that has been deferred.  Return it now */
1858                 chan->dtmff.frametype = AST_FRAME_DTMF;
1859                 chan->dtmff.subclass = chan->dtmfq[0];
1860                 /* Drop first digit */
1861                 memmove(chan->dtmfq, chan->dtmfq + 1, sizeof(chan->dtmfq) - 1);
1862                 ast_channel_unlock(chan);
1863                 return &chan->dtmff;
1864         }
1865         
1866         /* Read and ignore anything on the alertpipe, but read only
1867            one sizeof(blah) per frame that we send from it */
1868         if (chan->alertpipe[0] > -1)
1869                 read(chan->alertpipe[0], &blah, sizeof(blah));
1870 #ifdef ZAPTEL_OPTIMIZATIONS
1871         if (chan->timingfd > -1 && chan->fdno == AST_TIMING_FD && ast_test_flag(chan, AST_FLAG_EXCEPTION)) {
1872                 ast_clear_flag(chan, AST_FLAG_EXCEPTION);
1873                 blah = -1;
1874                 /* IF we can't get event, assume it's an expired as-per the old interface */
1875                 res = ioctl(chan->timingfd, ZT_GETEVENT, &blah);
1876                 if (res)
1877                         blah = ZT_EVENT_TIMER_EXPIRED;
1878
1879                 if (blah == ZT_EVENT_TIMER_PING) {
1880                         if (!chan->readq || !chan->readq->next) {
1881                                 /* Acknowledge PONG unless we need it again */
1882                                 if (ioctl(chan->timingfd, ZT_TIMERPONG, &blah)) {
1883                                         ast_log(LOG_WARNING, "Failed to pong timer on '%s': %s\n", chan->name, strerror(errno));
1884                                 }
1885                         }
1886                 } else if (blah == ZT_EVENT_TIMER_EXPIRED) {
1887                         ioctl(chan->timingfd, ZT_TIMERACK, &blah);
1888                         func = chan->timingfunc;
1889                         data = chan->timingdata;
1890                         ast_channel_unlock(chan);
1891                         if (func) {
1892 #if 0
1893                                 ast_log(LOG_DEBUG, "Calling private function\n");
1894 #endif                  
1895                                 func(data);
1896                         } else {
1897                                 blah = 0;
1898                                 ast_channel_lock(chan);
1899                                 ioctl(chan->timingfd, ZT_TIMERCONFIG, &blah);
1900                                 chan->timingdata = NULL;
1901                                 ast_channel_unlock(chan);
1902                         }
1903                         return &ast_null_frame;
1904                 } else
1905                         ast_log(LOG_NOTICE, "No/unknown event '%d' on timer for '%s'?\n", blah, chan->name);
1906         } else
1907 #endif
1908         /* Check for AST_GENERATOR_FD if not null.  If so, call generator with -1
1909            arguments now so it can do whatever it needs to. */
1910         if (chan->fds[AST_GENERATOR_FD] > -1 && chan->fdno == AST_GENERATOR_FD) {
1911                 void *tmp = chan->generatordata;
1912                 chan->generatordata = NULL;     /* reset to let ast_write get through */
1913                 chan->generator->generate(chan, tmp, -1, -1);
1914                 chan->generatordata = tmp;
1915                 return &ast_null_frame;
1916         }
1917
1918         /* Check for pending read queue */
1919         if (chan->readq) {
1920                 f = chan->readq;
1921                 chan->readq = f->next;
1922                 f->next = NULL;
1923                 /* Interpret hangup and return NULL */
1924                 if (f->frametype == AST_FRAME_CONTROL && f->subclass == AST_CONTROL_HANGUP) {
1925                         ast_frfree(f);
1926                         f = NULL;
1927                 }
1928         } else {
1929                 chan->blocker = pthread_self();
1930                 if (ast_test_flag(chan, AST_FLAG_EXCEPTION)) {
1931                         if (chan->tech->exception)
1932                                 f = chan->tech->exception(chan);
1933                         else {
1934                                 ast_log(LOG_WARNING, "Exception flag set on '%s', but no exception handler\n", chan->name);
1935                                 f = &ast_null_frame;
1936                         }
1937                         /* Clear the exception flag */
1938                         ast_clear_flag(chan, AST_FLAG_EXCEPTION);
1939                 } else {
1940                         if (chan->tech->read)
1941                                 f = chan->tech->read(chan);
1942                         else
1943                                 ast_log(LOG_WARNING, "No read routine on channel %s\n", chan->name);
1944                 }
1945         }
1946
1947         if (f) {
1948                 /* if the channel driver returned more than one frame, stuff the excess
1949                    into the readq for the next ast_read call
1950                 */
1951                 if (f->next) {
1952                         chan->readq = f->next;
1953                         f->next = NULL;
1954                 }
1955
1956                 switch (f->frametype) {
1957                 case AST_FRAME_CONTROL:
1958                         if (f->subclass == AST_CONTROL_ANSWER) {
1959                                 if (prestate == AST_STATE_UP) {
1960                                         ast_log(LOG_DEBUG, "Dropping duplicate answer!\n");
1961                                         f = &ast_null_frame;
1962                                 }
1963                                 /* Answer the CDR */
1964                                 ast_setstate(chan, AST_STATE_UP);
1965                                 ast_cdr_answer(chan->cdr);
1966                         }
1967                         break;
1968                 case AST_FRAME_DTMF:
1969                         ast_log(LOG_DTMF, "DTMF '%c' received on %s\n", f->subclass, chan->name);
1970                         if (ast_test_flag(chan, AST_FLAG_DEFER_DTMF)) {
1971                                 if (strlen(chan->dtmfq) < sizeof(chan->dtmfq) - 2)
1972                                         chan->dtmfq[strlen(chan->dtmfq)] = f->subclass;
1973                                 else
1974                                         ast_log(LOG_WARNING, "Dropping deferred DTMF digits on %s\n", chan->name);
1975                                 f = &ast_null_frame;
1976                         }
1977                         break;
1978                 case AST_FRAME_DTMF_BEGIN:
1979                         ast_log(LOG_DTMF, "DTMF begin '%c' received on %s\n", f->subclass, chan->name);
1980                         break;
1981                 case AST_FRAME_DTMF_END:
1982                         ast_log(LOG_DTMF, "DTMF end '%c' received on %s\n", f->subclass, chan->name);
1983                         break;
1984                 case AST_FRAME_VOICE:
1985                         if (dropaudio) {
1986                                 ast_frfree(f);
1987                                 f = &ast_null_frame;
1988                         } else if (!(f->subclass & chan->nativeformats)) {
1989                                 /* This frame can't be from the current native formats -- drop it on the
1990                                    floor */
1991                                 ast_log(LOG_NOTICE, "Dropping incompatible voice frame on %s of format %s since our native format has changed to %s\n",
1992                                         chan->name, ast_getformatname(f->subclass), ast_getformatname(chan->nativeformats));
1993                                 ast_frfree(f);
1994                                 f = &ast_null_frame;
1995                         } else {
1996                                 if (chan->spies)
1997                                         queue_frame_to_spies(chan, f, SPY_READ);
1998                                 
1999                                 if (chan->monitor && chan->monitor->read_stream ) {
2000 #ifndef MONITOR_CONSTANT_DELAY
2001                                         int jump = chan->outsmpl - chan->insmpl - 4 * f->samples;
2002                                         if (jump >= 0) {
2003                                                 if (ast_seekstream(chan->monitor->read_stream, jump + f->samples, SEEK_FORCECUR) == -1)
2004                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring read stream, synchronization between the files may be broken\n");
2005                                                 chan->insmpl += jump + 4 * f->samples;
2006                                         } else
2007                                                 chan->insmpl+= f->samples;
2008 #else
2009                                         int jump = chan->outsmpl - chan->insmpl;
2010                                         if (jump - MONITOR_DELAY >= 0) {
2011                                                 if (ast_seekstream(chan->monitor->read_stream, jump - f->samples, SEEK_FORCECUR) == -1)
2012                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring read stream, synchronization between the files may be broken\n");
2013                                                 chan->insmpl += jump;
2014                                         } else
2015                                                 chan->insmpl += f->samples;
2016 #endif
2017                                         if (chan->monitor->state == AST_MONITOR_RUNNING) {
2018                                                 if (ast_writestream(chan->monitor->read_stream, f) < 0)
2019                                                         ast_log(LOG_WARNING, "Failed to write data to channel monitor read stream\n");
2020                                         }
2021                                 }
2022
2023                                 if (chan->readtrans) {
2024                                         if (!(f = ast_translate(chan->readtrans, f, 1)))
2025                                                 f = &ast_null_frame;
2026                                 }
2027
2028                                 /* Run generator sitting on the line if timing device not available
2029                                 * and synchronous generation of outgoing frames is necessary       */
2030                                 if (chan->generatordata &&  !ast_internal_timing_enabled(chan)) {
2031                                         void *tmp;
2032                                         int res;
2033                                         int (*generate)(struct ast_channel *chan, void *tmp, int datalen, int samples);
2034
2035                                         if (chan->timingfunc) {
2036                                                 if (option_debug > 1)
2037                                                         ast_log(LOG_DEBUG, "Generator got voice, switching to phase locked mode\n");
2038                                                 ast_settimeout(chan, 0, NULL, NULL);
2039                                         }
2040
2041                                         tmp = chan->generatordata;
2042                                         chan->generatordata = NULL;
2043                                         generate = chan->generator->generate;
2044                                         res = generate(chan, tmp, f->datalen, f->samples);
2045                                         chan->generatordata = tmp;
2046                                         if (res) {
2047                                                 if (option_debug > 1)
2048                                                         ast_log(LOG_DEBUG, "Auto-deactivating generator\n");
2049                                                 ast_deactivate_generator(chan);
2050                                         }
2051
2052                                 } else if (f->frametype == AST_FRAME_CNG) {
2053                                         if (chan->generator && !chan->timingfunc && (chan->timingfd > -1)) {
2054                                                 if (option_debug > 1)
2055                                                         ast_log(LOG_DEBUG, "Generator got CNG, switching to timed mode\n");
2056                                                 ast_settimeout(chan, 160, generator_force, chan);
2057                                         }
2058                                 }
2059                         }
2060                 }
2061         } else {
2062                 /* Make sure we always return NULL in the future */
2063                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
2064                 if (chan->generator)
2065                         ast_deactivate_generator(chan);
2066                 /* End the CDR if appropriate */
2067                 if (chan->cdr)
2068                         ast_cdr_end(chan->cdr);
2069         }
2070
2071         /* High bit prints debugging */
2072         if (chan->fin & 0x80000000)
2073                 ast_frame_dump(chan->name, f, "<<");
2074         if ((chan->fin & 0x7fffffff) == 0x7fffffff)
2075                 chan->fin &= 0x80000000;
2076         else
2077                 chan->fin++;
2078         ast_mutex_unlock(&chan->lock);
2079
2080         return f;
2081 }
2082
2083 int ast_internal_timing_enabled(struct ast_channel *chan)
2084 {
2085         int ret = ast_opt_internal_timing && chan->timingfd > -1;
2086         if (option_debug > 3)
2087                 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);
2088         return ret;
2089 }
2090
2091 struct ast_frame *ast_read(struct ast_channel *chan)
2092 {
2093         return __ast_read(chan, 0);
2094 }
2095
2096 struct ast_frame *ast_read_noaudio(struct ast_channel *chan)
2097 {
2098         return __ast_read(chan, 1);
2099 }
2100
2101 int ast_indicate(struct ast_channel *chan, int condition)
2102 {
2103         int res = -1;
2104
2105         ast_mutex_lock(&chan->lock);
2106         /* Stop if we're a zombie or need a soft hangup */
2107         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
2108                 ast_mutex_unlock(&chan->lock);
2109                 return -1;
2110         }
2111         if (chan->tech->indicate)
2112                 res = chan->tech->indicate(chan, condition);
2113         ast_mutex_unlock(&chan->lock);
2114         if (!chan->tech->indicate || res) {
2115                 /*
2116                  * Device does not support (that) indication, lets fake
2117                  * it by doing our own tone generation. (PM2002)
2118                  */
2119                 if (condition >= 0) {
2120                         const struct tone_zone_sound *ts = NULL;
2121                         switch (condition) {
2122                         case AST_CONTROL_RINGING:
2123                                 ts = ast_get_indication_tone(chan->zone, "ring");
2124                                 break;
2125                         case AST_CONTROL_BUSY:
2126                                 ts = ast_get_indication_tone(chan->zone, "busy");
2127                                 break;
2128                         case AST_CONTROL_CONGESTION:
2129                                 ts = ast_get_indication_tone(chan->zone, "congestion");
2130                                 break;
2131                         }
2132                         if (ts && ts->data[0]) {
2133                                 ast_log(LOG_DEBUG, "Driver for channel '%s' does not support indication %d, emulating it\n", chan->name, condition);
2134                                 ast_playtones_start(chan,0,ts->data, 1);
2135                                 res = 0;
2136                         } else if (condition == AST_CONTROL_PROGRESS) {
2137                                 /* ast_playtones_stop(chan); */
2138                         } else if (condition == AST_CONTROL_PROCEEDING) {
2139                                 /* Do nothing, really */
2140                         } else if (condition == AST_CONTROL_HOLD) {
2141                                 /* Do nothing.... */
2142                         } else if (condition == AST_CONTROL_UNHOLD) {
2143                                 /* Do nothing.... */
2144                         } else if (condition == AST_CONTROL_VIDUPDATE) {
2145                                 /* Do nothing.... */
2146                         } else {
2147                                 /* not handled */
2148                                 ast_log(LOG_WARNING, "Unable to handle indication %d for '%s'\n", condition, chan->name);
2149                                 res = -1;
2150                         }
2151                 }
2152                 else ast_playtones_stop(chan);
2153         }
2154         return res;
2155 }
2156
2157 int ast_recvchar(struct ast_channel *chan, int timeout)
2158 {
2159         int c;
2160         char *buf = ast_recvtext(chan, timeout);
2161         if (buf == NULL)
2162                 return -1;      /* error or timeout */
2163         c = *(unsigned char *)buf;
2164         free(buf);
2165         return c;
2166 }
2167
2168 char *ast_recvtext(struct ast_channel *chan, int timeout)
2169 {
2170         int res, done = 0;
2171         char *buf = NULL;
2172         
2173         while (!done) {
2174                 struct ast_frame *f;
2175                 if (ast_check_hangup(chan))
2176                         break;
2177                 res = ast_waitfor(chan, timeout);
2178                 if (res <= 0) /* timeout or error */
2179                         break;
2180                 timeout = res;  /* update timeout */
2181                 f = ast_read(chan);
2182                 if (f == NULL)
2183                         break; /* no frame */
2184                 if (f->frametype == AST_FRAME_CONTROL && f->subclass == AST_CONTROL_HANGUP)
2185                         done = 1;       /* force a break */
2186                 else if (f->frametype == AST_FRAME_TEXT) {              /* what we want */
2187                         buf = ast_strndup((char *) f->data, f->datalen);        /* dup and break */
2188                         done = 1;
2189                 }
2190                 ast_frfree(f);
2191         }
2192         return buf;
2193 }
2194
2195 int ast_sendtext(struct ast_channel *chan, const char *text)
2196 {
2197         int res = 0;
2198         /* Stop if we're a zombie or need a soft hangup */
2199         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))
2200                 return -1;
2201         CHECK_BLOCKING(chan);
2202         if (chan->tech->send_text)
2203                 res = chan->tech->send_text(chan, text);
2204         ast_clear_flag(chan, AST_FLAG_BLOCKING);
2205         return res;
2206 }
2207
2208 static int do_senddigit(struct ast_channel *chan, char digit)
2209 {
2210         int res = -1;
2211
2212         if (chan->tech->send_digit)
2213                 res = chan->tech->send_digit(chan, digit);
2214         if (!(chan->tech->send_digit && chan->tech->send_digit_begin) ||
2215             res) {
2216                 /*
2217                  * Device does not support DTMF tones, lets fake
2218                  * it by doing our own generation. (PM2002)
2219                  */
2220                 static const char* dtmf_tones[] = {
2221                         "!941+1336/100,!0/100", /* 0 */
2222                         "!697+1209/100,!0/100", /* 1 */
2223                         "!697+1336/100,!0/100", /* 2 */
2224                         "!697+1477/100,!0/100", /* 3 */
2225                         "!770+1209/100,!0/100", /* 4 */
2226                         "!770+1336/100,!0/100", /* 5 */
2227                         "!770+1477/100,!0/100", /* 6 */
2228                         "!852+1209/100,!0/100", /* 7 */
2229                         "!852+1336/100,!0/100", /* 8 */
2230                         "!852+1477/100,!0/100", /* 9 */
2231                         "!697+1633/100,!0/100", /* A */
2232                         "!770+1633/100,!0/100", /* B */
2233                         "!852+1633/100,!0/100", /* C */
2234                         "!941+1633/100,!0/100", /* D */
2235                         "!941+1209/100,!0/100", /* * */
2236                         "!941+1477/100,!0/100" };       /* # */
2237                 if (digit >= '0' && digit <='9')
2238                         ast_playtones_start(chan, 0, dtmf_tones[digit-'0'], 0);
2239                 else if (digit >= 'A' && digit <= 'D')
2240                         ast_playtones_start(chan, 0, dtmf_tones[digit-'A'+10], 0);
2241                 else if (digit == '*')
2242                         ast_playtones_start(chan, 0, dtmf_tones[14], 0);
2243                 else if (digit == '#')
2244                         ast_playtones_start(chan, 0, dtmf_tones[15], 0);
2245                 else {
2246                         /* not handled */
2247                         ast_log(LOG_DEBUG, "Unable to generate DTMF tone '%c' for '%s'\n", digit, chan->name);
2248                 }
2249         }
2250         return 0;
2251 }
2252
2253 int ast_senddigit(struct ast_channel *chan, char digit)
2254 {
2255         return do_senddigit(chan, digit);
2256 }
2257
2258 int ast_prod(struct ast_channel *chan)
2259 {
2260         struct ast_frame a = { AST_FRAME_VOICE };
2261         char nothing[128];
2262
2263         /* Send an empty audio frame to get things moving */
2264         if (chan->_state != AST_STATE_UP) {
2265                 ast_log(LOG_DEBUG, "Prodding channel '%s'\n", chan->name);
2266                 a.subclass = chan->rawwriteformat;
2267                 a.data = nothing + AST_FRIENDLY_OFFSET;
2268                 a.src = "ast_prod";
2269                 if (ast_write(chan, &a))
2270                         ast_log(LOG_WARNING, "Prodding channel '%s' failed\n", chan->name);
2271         }
2272         return 0;
2273 }
2274
2275 int ast_write_video(struct ast_channel *chan, struct ast_frame *fr)
2276 {
2277         int res;
2278         if (!chan->tech->write_video)
2279                 return 0;
2280         res = ast_write(chan, fr);
2281         if (!res)
2282                 res = 1;
2283         return res;
2284 }
2285
2286 int ast_write(struct ast_channel *chan, struct ast_frame *fr)
2287 {
2288         int res = -1;
2289         struct ast_frame *f = NULL;
2290         /* Stop if we're a zombie or need a soft hangup */
2291         ast_channel_lock(chan);
2292         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))  {
2293                 ast_channel_unlock(chan);
2294                 return -1;
2295         }
2296         /* Handle any pending masquerades */
2297         if (chan->masq) {
2298                 if (ast_do_masquerade(chan)) {
2299                         ast_log(LOG_WARNING, "Failed to perform masquerade\n");
2300                         ast_channel_unlock(chan);
2301                         return -1;
2302                 }
2303         }
2304         if (chan->masqr) {
2305                 ast_channel_unlock(chan);
2306                 return 0;
2307         }
2308         if (chan->generatordata) {
2309                 if (ast_test_flag(chan, AST_FLAG_WRITE_INT))
2310                         ast_deactivate_generator(chan);
2311                 else {
2312                         ast_channel_unlock(chan);
2313                         return 0;
2314                 }
2315         }
2316         /* High bit prints debugging */
2317         if (chan->fout & 0x80000000)
2318                 ast_frame_dump(chan->name, fr, ">>");
2319         CHECK_BLOCKING(chan);
2320         switch(fr->frametype) {
2321         case AST_FRAME_CONTROL:
2322                 /* XXX Interpret control frames XXX */
2323                 ast_log(LOG_WARNING, "Don't know how to handle control frames yet\n");
2324                 break;
2325         case AST_FRAME_DTMF_BEGIN:
2326                 if (chan->tech->send_digit_begin)
2327                         res = chan->tech->send_digit_begin(chan, fr->subclass);
2328                 else
2329                         res = 0;
2330                 break;
2331         case AST_FRAME_DTMF_END:
2332                 if (chan->tech->send_digit_end)
2333                         res = chan->tech->send_digit_end(chan);
2334                 else
2335                         res = 0;
2336                 break;
2337         case AST_FRAME_DTMF:
2338                 ast_clear_flag(chan, AST_FLAG_BLOCKING);
2339                 ast_channel_unlock(chan);
2340                 res = do_senddigit(chan,fr->subclass);
2341                 ast_channel_lock(chan);
2342                 CHECK_BLOCKING(chan);
2343                 break;
2344         case AST_FRAME_TEXT:
2345                 if (chan->tech->send_text)
2346                         res = chan->tech->send_text(chan, (char *) fr->data);
2347                 else
2348                         res = 0;
2349                 break;
2350         case AST_FRAME_HTML:
2351                 if (chan->tech->send_html)
2352                         res = chan->tech->send_html(chan, fr->subclass, (char *) fr->data, fr->datalen);
2353                 else
2354                         res = 0;
2355                 break;
2356         case AST_FRAME_VIDEO:
2357                 /* XXX Handle translation of video codecs one day XXX */
2358                 if (chan->tech->write_video)
2359                         res = chan->tech->write_video(chan, fr);
2360                 else
2361                         res = 0;
2362                 break;
2363         case AST_FRAME_VOICE:
2364                 if (chan->tech->write) {
2365                         /* Bypass translator if we're writing format in the raw write format.  This
2366                            allows mixing of native / non-native formats */
2367                         if (fr->subclass == chan->rawwriteformat)
2368                                 f = fr;
2369                         else
2370                                 f = (chan->writetrans) ? ast_translate(chan->writetrans, fr, 0) : fr;
2371                         if (f) {
2372                                 if (chan->spies)
2373                                         queue_frame_to_spies(chan, f, SPY_WRITE);
2374
2375                                 if (chan->monitor && chan->monitor->write_stream) {
2376 #ifndef MONITOR_CONSTANT_DELAY
2377                                         int jump = chan->insmpl - chan->outsmpl - 4 * f->samples;
2378                                         if (jump >= 0) {
2379                                                 if (ast_seekstream(chan->monitor->write_stream, jump + f->samples, SEEK_FORCECUR) == -1)
2380                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
2381                                                 chan->outsmpl += jump + 4 * f->samples;
2382                                         } else
2383                                                 chan->outsmpl += f->samples;
2384 #else
2385                                         int jump = chan->insmpl - chan->outsmpl;
2386                                         if (jump - MONITOR_DELAY >= 0) {
2387                                                 if (ast_seekstream(chan->monitor->write_stream, jump - f->samples, SEEK_FORCECUR) == -1)
2388                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
2389                                                 chan->outsmpl += jump;
2390                                         } else
2391                                                 chan->outsmpl += f->samples;
2392 #endif
2393                                         if (chan->monitor->state == AST_MONITOR_RUNNING) {
2394                                                 if (ast_writestream(chan->monitor->write_stream, f) < 0)
2395                                                         ast_log(LOG_WARNING, "Failed to write data to channel monitor write stream\n");
2396                                         }
2397                                 }
2398
2399                                 res = chan->tech->write(chan, f);
2400                         } else
2401                                 res = 0;
2402                 }
2403         }
2404
2405         if (f && (f != fr))
2406                 ast_frfree(f);
2407         ast_clear_flag(chan, AST_FLAG_BLOCKING);
2408         /* Consider a write failure to force a soft hangup */
2409         if (res < 0)
2410                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
2411         else {
2412                 if ((chan->fout & 0x7fffffff) == 0x7fffffff)
2413                         chan->fout &= 0x80000000;
2414                 else
2415                         chan->fout++;
2416         }
2417         ast_channel_unlock(chan);
2418         return res;
2419 }
2420
2421 static int set_format(struct ast_channel *chan, int fmt, int *rawformat, int *format,
2422                       struct ast_trans_pvt **trans, const int direction)
2423 {
2424         int native;
2425         int res;
2426         
2427         /* Make sure we only consider audio */
2428         fmt &= AST_FORMAT_AUDIO_MASK;
2429         
2430         native = chan->nativeformats;
2431         /* Find a translation path from the native format to one of the desired formats */
2432         if (!direction)
2433                 /* reading */
2434                 res = ast_translator_best_choice(&fmt, &native);
2435         else
2436                 /* writing */
2437                 res = ast_translator_best_choice(&native, &fmt);
2438
2439         if (res < 0) {
2440                 ast_log(LOG_WARNING, "Unable to find a codec translation path from %s to %s\n",
2441                         ast_getformatname(native), ast_getformatname(fmt));
2442                 return -1;
2443         }
2444         
2445         /* Now we have a good choice for both. */
2446         ast_channel_lock(chan);
2447         *rawformat = native;
2448         /* User perspective is fmt */
2449         *format = fmt;
2450         /* Free any read translation we have right now */
2451         if (*trans)
2452                 ast_translator_free_path(*trans);
2453         /* Build a translation path from the raw format to the desired format */
2454         if (!direction)
2455                 /* reading */
2456                 *trans = ast_translator_build_path(*format, *rawformat);
2457         else
2458                 /* writing */
2459                 *trans = ast_translator_build_path(*rawformat, *format);
2460         ast_channel_unlock(chan);
2461         if (option_debug)
2462                 ast_log(LOG_DEBUG, "Set channel %s to %s format %s\n", chan->name,
2463                         direction ? "write" : "read", ast_getformatname(fmt));
2464         return 0;
2465 }
2466
2467 int ast_set_read_format(struct ast_channel *chan, int fmt)
2468 {
2469         return set_format(chan, fmt, &chan->rawreadformat, &chan->readformat,
2470                           &chan->readtrans, 0);
2471 }
2472
2473 int ast_set_write_format(struct ast_channel *chan, int fmt)
2474 {
2475         return set_format(chan, fmt, &chan->rawwriteformat, &chan->writeformat,
2476                           &chan->writetrans, 1);
2477 }
2478
2479 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)
2480 {
2481         int state = 0;
2482         int cause = 0;
2483         struct ast_channel *chan;
2484         struct ast_frame *f;
2485         int res = 0;
2486         
2487         chan = ast_request(type, format, data, &cause);
2488         if (chan) {
2489                 if (oh) {
2490                         if (oh->vars)   
2491                                 ast_set_variables(chan, oh->vars);
2492                         if (oh->cid_num && *oh->cid_num && oh->cid_name && *oh->cid_name)
2493                                 ast_set_callerid(chan, oh->cid_num, oh->cid_name, oh->cid_num);
2494                         if (oh->parent_channel)
2495                                 ast_channel_inherit_variables(oh->parent_channel, chan);
2496                         if (oh->account)
2497                                 ast_cdr_setaccount(chan, oh->account);  
2498                 }
2499                 ast_set_callerid(chan, cid_num, cid_name, cid_num);
2500
2501                 if (!ast_call(chan, data, 0)) {
2502                         res = 1;        /* in case chan->_state is already AST_STATE_UP */
2503                         while (timeout && (chan->_state != AST_STATE_UP)) {
2504                                 res = ast_waitfor(chan, timeout);
2505                                 if (res < 0) {
2506                                         /* Something not cool, or timed out */
2507                                         break;
2508                                 }
2509                                 /* If done, break out */
2510                                 if (!res)
2511                                         break;
2512                                 if (timeout > -1)
2513                                         timeout = res;
2514                                 f = ast_read(chan);
2515                                 if (!f) {
2516                                         state = AST_CONTROL_HANGUP;
2517                                         res = 0;
2518                                         break;
2519                                 }
2520                                 if (f->frametype == AST_FRAME_CONTROL) {
2521                                         if (f->subclass == AST_CONTROL_RINGING)
2522                                                 state = AST_CONTROL_RINGING;
2523                                         else if ((f->subclass == AST_CONTROL_BUSY) || (f->subclass == AST_CONTROL_CONGESTION)) {
2524                                                 state = f->subclass;
2525                                                 ast_frfree(f);
2526                                                 break;
2527                                         } else if (f->subclass == AST_CONTROL_ANSWER) {
2528                                                 state = f->subclass;
2529                                                 ast_frfree(f);
2530                                                 break;
2531                                         } else if (f->subclass == AST_CONTROL_PROGRESS) {
2532                                                 /* Ignore */
2533                                         } else if (f->subclass == -1) {
2534                                                 /* Ignore -- just stopping indications */
2535                                         } else {
2536                                                 ast_log(LOG_NOTICE, "Don't know what to do with control frame %d\n", f->subclass);
2537                                         }
2538                                 }
2539                                 ast_frfree(f);
2540                         }
2541                 } else
2542                         ast_log(LOG_NOTICE, "Unable to call channel %s/%s\n", type, (char *)data);
2543         } else {
2544                 ast_log(LOG_NOTICE, "Unable to request channel %s/%s\n", type, (char *)data);
2545                 switch(cause) {
2546                 case AST_CAUSE_BUSY:
2547                         state = AST_CONTROL_BUSY;
2548                         break;
2549                 case AST_CAUSE_CONGESTION:
2550                         state = AST_CONTROL_CONGESTION;
2551                         break;
2552                 }
2553         }
2554         if (chan) {
2555                 /* Final fixups */
2556                 if (oh) {
2557                         if (oh->context && *oh->context)
2558                                 ast_copy_string(chan->context, oh->context, sizeof(chan->context));
2559                         if (oh->exten && *oh->exten)
2560                                 ast_copy_string(chan->exten, oh->exten, sizeof(chan->exten));
2561                         if (oh->priority)       
2562                                 chan->priority = oh->priority;
2563                 }
2564                 if (chan->_state == AST_STATE_UP)
2565                         state = AST_CONTROL_ANSWER;
2566         }
2567         if (outstate)
2568                 *outstate = state;
2569         if (chan && res <= 0) {
2570                 if (!chan->cdr && (chan->cdr = ast_cdr_alloc())) {
2571                         ast_cdr_init(chan->cdr, chan);
2572                 }
2573                 if (chan->cdr) {
2574                         char tmp[256];
2575                         snprintf(tmp, 256, "%s/%s", type, (char *)data);
2576                         ast_cdr_setapp(chan->cdr,"Dial",tmp);
2577                         ast_cdr_update(chan);
2578                         ast_cdr_start(chan->cdr);
2579                         ast_cdr_end(chan->cdr);
2580                         /* If the cause wasn't handled properly */
2581                         if (ast_cdr_disposition(chan->cdr,chan->hangupcause))
2582                                 ast_cdr_failed(chan->cdr);
2583                 }
2584                 ast_hangup(chan);
2585                 chan = NULL;
2586         }
2587         return chan;
2588 }
2589
2590 struct ast_channel *ast_request_and_dial(const char *type, int format, void *data, int timeout, int *outstate, const char *cidnum, const char *cidname)
2591 {
2592         return __ast_request_and_dial(type, format, data, timeout, outstate, cidnum, cidname, NULL);
2593 }
2594
2595 struct ast_channel *ast_request(const char *type, int format, void *data, int *cause)
2596 {
2597         struct chanlist *chan;
2598         struct ast_channel *c;
2599         int capabilities;
2600         int fmt;
2601         int res;
2602         int foo;
2603
2604         if (!cause)
2605                 cause = &foo;
2606         *cause = AST_CAUSE_NOTDEFINED;
2607
2608         if (AST_LIST_LOCK(&channels)) {
2609                 ast_log(LOG_WARNING, "Unable to lock channel list\n");
2610                 return NULL;
2611         }
2612
2613         AST_LIST_TRAVERSE(&backends, chan, list) {
2614                 if (strcasecmp(type, chan->tech->type))
2615                         continue;
2616
2617                 capabilities = chan->tech->capabilities;
2618                 fmt = format;
2619                 res = ast_translator_best_choice(&fmt, &capabilities);
2620                 if (res < 0) {
2621                         ast_log(LOG_WARNING, "No translator path exists for channel type %s (native %d) to %d\n", type, chan->tech->capabilities, format);
2622                         AST_LIST_UNLOCK(&channels);
2623                         return NULL;
2624                 }
2625                 AST_LIST_UNLOCK(&channels);
2626                 if (!chan->tech->requester)
2627                         return NULL;
2628                 
2629                 if (!(c = chan->tech->requester(type, capabilities, data, cause)))
2630                         return NULL;
2631
2632                 if (c->_state == AST_STATE_DOWN) {
2633                         manager_event(EVENT_FLAG_CALL, "Newchannel",
2634                                       "Channel: %s\r\n"
2635                                       "State: %s\r\n"
2636                                       "CallerID: %s\r\n"
2637                                       "CallerIDName: %s\r\n"
2638                                       "Uniqueid: %s\r\n",
2639                                       c->name, ast_state2str(c->_state),
2640                                       c->cid.cid_num ? c->cid.cid_num : "<unknown>",
2641                                       c->cid.cid_name ? c->cid.cid_name : "<unknown>",
2642                                       c->uniqueid);
2643                 }
2644                 return c;
2645         }
2646
2647         ast_log(LOG_WARNING, "No channel type registered for '%s'\n", type);
2648         *cause = AST_CAUSE_NOSUCHDRIVER;
2649         AST_LIST_UNLOCK(&channels);
2650
2651         return NULL;
2652 }
2653
2654 int ast_call(struct ast_channel *chan, char *addr, int timeout)
2655 {
2656         /* Place an outgoing call, but don't wait any longer than timeout ms before returning.
2657            If the remote end does not answer within the timeout, then do NOT hang up, but
2658            return anyway.  */
2659         int res = -1;
2660         /* Stop if we're a zombie or need a soft hangup */
2661         ast_mutex_lock(&chan->lock);
2662         if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan))
2663                 if (chan->tech->call)
2664                         res = chan->tech->call(chan, addr, timeout);
2665         ast_mutex_unlock(&chan->lock);
2666         return res;
2667 }
2668
2669 /*!
2670   \brief Transfer a call to dest, if the channel supports transfer
2671
2672   Called by:
2673     \arg app_transfer
2674     \arg the manager interface
2675 */
2676 int ast_transfer(struct ast_channel *chan, char *dest)
2677 {
2678         int res = -1;
2679
2680         /* Stop if we're a zombie or need a soft hangup */
2681         ast_mutex_lock(&chan->lock);
2682         if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan)) {
2683                 if (chan->tech->transfer) {
2684                         res = chan->tech->transfer(chan, dest);
2685                         if (!res)
2686                                 res = 1;
2687                 } else
2688                         res = 0;
2689         }
2690         ast_mutex_unlock(&chan->lock);
2691         return res;
2692 }
2693
2694 int ast_readstring(struct ast_channel *c, char *s, int len, int timeout, int ftimeout, char *enders)
2695 {
2696         return ast_readstring_full(c, s, len, timeout, ftimeout, enders, -1, -1);
2697 }
2698
2699 int ast_readstring_full(struct ast_channel *c, char *s, int len, int timeout, int ftimeout, char *enders, int audiofd, int ctrlfd)
2700 {
2701         int pos = 0;    /* index in the buffer where we accumulate digits */
2702         int to = ftimeout;
2703
2704         /* Stop if we're a zombie or need a soft hangup */
2705         if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
2706                 return -1;
2707         if (!len)
2708                 return -1;
2709         for (;;) {
2710                 int d;
2711                 if (c->stream) {
2712                         d = ast_waitstream_full(c, AST_DIGIT_ANY, audiofd, ctrlfd);
2713                         ast_stopstream(c);
2714                         usleep(1000);
2715                         if (!d)
2716                                 d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
2717                 } else {
2718                         d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
2719                 }
2720                 if (d < 0)
2721                         return -1;
2722                 if (d == 0) {
2723                         s[pos]='\0';
2724                         return 1;
2725                 }
2726                 if (d == 1) {
2727                         s[pos]='\0';
2728                         return 2;
2729                 }
2730                 if (!strchr(enders, d))
2731                         s[pos++] = d;
2732                 if (strchr(enders, d) || (pos >= len)) {
2733                         s[pos]='\0';
2734                         return 0;
2735                 }
2736                 to = timeout;
2737         }
2738         /* Never reached */
2739         return 0;
2740 }
2741
2742 int ast_channel_supports_html(struct ast_channel *chan)
2743 {
2744         return (chan->tech->send_html) ? 1 : 0;
2745 }
2746
2747 int ast_channel_sendhtml(struct ast_channel *chan, int subclass, const char *data, int datalen)
2748 {
2749         if (chan->tech->send_html)
2750                 return chan->tech->send_html(chan, subclass, data, datalen);
2751         return -1;
2752 }
2753
2754 int ast_channel_sendurl(struct ast_channel *chan, const char *url)
2755 {
2756         return ast_channel_sendhtml(chan, AST_HTML_URL, url, strlen(url) + 1);
2757 }
2758
2759 int ast_channel_make_compatible(struct ast_channel *chan, struct ast_channel *peer)
2760 {
2761         int src;
2762         int dst;
2763
2764         /* Set up translation from the chan to the peer */
2765         src = chan->nativeformats;
2766         dst = peer->nativeformats;
2767         if (ast_translator_best_choice(&dst, &src) < 0) {
2768                 ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", chan->name, src, peer->name, dst);
2769                 return -1;
2770         }
2771
2772         /* if the best path is not 'pass through', then
2773            transcoding is needed; if desired, force transcode path
2774            to use SLINEAR between channels */
2775         if ((src != dst) && ast_opt_transcode_via_slin)
2776                 dst = AST_FORMAT_SLINEAR;
2777         if (ast_set_read_format(chan, dst) < 0) {
2778                 ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", chan->name, dst);
2779                 return -1;
2780         }
2781         if (ast_set_write_format(peer, dst) < 0) {
2782                 ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", peer->name, dst);
2783                 return -1;
2784         }
2785
2786         /* Set up translation from the peer to the chan */
2787         src = peer->nativeformats;
2788         dst = chan->nativeformats;
2789         if (ast_translator_best_choice(&dst, &src) < 0) {
2790                 ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", peer->name, src, chan->name, dst);
2791                 return -1;
2792         }
2793         /* if the best path is not 'pass through', then
2794            transcoding is needed; if desired, force transcode path
2795            to use SLINEAR between channels */
2796         if ((src != dst) && ast_opt_transcode_via_slin)
2797                 dst = AST_FORMAT_SLINEAR;
2798         if (ast_set_read_format(peer, dst) < 0) {
2799                 ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", peer->name, dst);
2800                 return -1;
2801         }
2802         if (ast_set_write_format(chan, dst) < 0) {
2803                 ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", chan->name, dst);
2804                 return -1;
2805         }
2806         return 0;
2807 }
2808
2809 int ast_channel_masquerade(struct ast_channel *original, struct ast_channel *clone)
2810 {
2811         int res = -1;
2812
2813         if (original == clone) {
2814                 ast_log(LOG_WARNING, "Can't masquerade channel '%s' into itself!\n", original->name);
2815                 return -1;
2816         }
2817         ast_mutex_lock(&original->lock);
2818         while(ast_mutex_trylock(&clone->lock)) {
2819                 ast_mutex_unlock(&original->lock);
2820                 usleep(1);
2821                 ast_mutex_lock(&original->lock);
2822         }
2823         ast_log(LOG_DEBUG, "Planning to masquerade channel %s into the structure of %s\n",
2824                 clone->name, original->name);
2825         if (original->masq) {
2826                 ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
2827                         original->masq->name, original->name);
2828         } else if (clone->masqr) {
2829                 ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
2830                         clone->name, clone->masqr->name);
2831         } else {
2832                 original->masq = clone;
2833                 clone->masqr = original;
2834                 ast_queue_frame(original, &ast_null_frame);
2835                 ast_queue_frame(clone, &ast_null_frame);
2836                 ast_log(LOG_DEBUG, "Done planning to masquerade channel %s into the structure of %s\n", clone->name, original->name);
2837                 res = 0;
2838         }
2839         ast_mutex_unlock(&clone->lock);
2840         ast_mutex_unlock(&original->lock);
2841         return res;
2842 }
2843
2844 void ast_change_name(struct ast_channel *chan, char *newname)
2845 {
2846         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", chan->name, newname, chan->uniqueid);
2847         ast_string_field_set(chan, name, newname);
2848 }
2849
2850 void ast_channel_inherit_variables(const struct ast_channel *parent, struct ast_channel *child)
2851 {
2852         struct ast_var_t *current, *newvar;
2853         const char *varname;
2854
2855         AST_LIST_TRAVERSE(&parent->varshead, current, entries) {
2856                 int vartype = 0;
2857
2858                 varname = ast_var_full_name(current);
2859                 if (!varname)
2860                         continue;
2861
2862                 if (varname[0] == '_') {
2863                         vartype = 1;
2864                         if (varname[1] == '_')
2865                                 vartype = 2;
2866                 }
2867
2868                 switch (vartype) {
2869                 case 1:
2870                         newvar = ast_var_assign(&varname[1], ast_var_value(current));
2871                         if (newvar) {
2872                                 AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
2873                                 if (option_debug)
2874                                         ast_log(LOG_DEBUG, "Copying soft-transferable variable %s.\n", ast_var_name(newvar));
2875                         }
2876                         break;
2877                 case 2:
2878                         newvar = ast_var_assign(ast_var_full_name(current), ast_var_value(current));
2879                         if (newvar) {
2880                                 AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
2881                                 if (option_debug)
2882                                         ast_log(LOG_DEBUG, "Copying hard-transferable variable %s.\n", ast_var_name(newvar));
2883                         }
2884                         break;
2885                 default:
2886                         if (option_debug)
2887                                 ast_log(LOG_DEBUG, "Not copying variable %s.\n", ast_var_name(current));
2888                         break;
2889                 }
2890         }
2891 }
2892
2893 /*!
2894   \brief Clone channel variables from 'clone' channel into 'original' channel
2895
2896   All variables except those related to app_groupcount are cloned.
2897   Variables are actually _removed_ from 'clone' channel, presumably
2898   because it will subsequently be destroyed.
2899
2900   \note Assumes locks will be in place on both channels when called.
2901 */
2902 static void clone_variables(struct ast_channel *original, struct ast_channel *clone)
2903 {
2904         struct ast_var_t *varptr;
2905
2906         /* we need to remove all app_groupcount related variables from the original
2907            channel before merging in the clone's variables; any groups assigned to the
2908            original channel should be released, only those assigned to the clone
2909            should remain
2910         */
2911
2912         AST_LIST_TRAVERSE_SAFE_BEGIN(&original->varshead, varptr, entries) {
2913                 if (!strncmp(ast_var_name(varptr), GROUP_CATEGORY_PREFIX, strlen(GROUP_CATEGORY_PREFIX))) {
2914                         AST_LIST_REMOVE(&original->varshead, varptr, entries);
2915                         ast_var_delete(varptr);
2916                 }
2917         }
2918         AST_LIST_TRAVERSE_SAFE_END;
2919
2920         /* Append variables from clone channel into original channel */
2921         /* XXX Is this always correct?  We have to in order to keep MACROS working XXX */
2922         if (AST_LIST_FIRST(&clone->varshead))
2923                 AST_LIST_INSERT_TAIL(&original->varshead, AST_LIST_FIRST(&clone->varshead), entries);
2924 }
2925
2926 /*!
2927   \brief Masquerade a channel
2928
2929   \note Assumes channel will be locked when called
2930 */
2931 int ast_do_masquerade(struct ast_channel *original)
2932 {
2933         int x,i;
2934         int res=0;
2935         int origstate;
2936         struct ast_frame *cur, *prev;
2937         const struct ast_channel_tech *t;
2938         void *t_pvt;
2939         struct ast_callerid tmpcid;
2940         struct ast_channel *clone = original->masq;
2941         int rformat = original->readformat;
2942         int wformat = original->writeformat;
2943         char newn[100];
2944         char orig[100];
2945         char masqn[100];
2946         char zombn[100];
2947
2948         if (option_debug > 3)
2949                 ast_log(LOG_DEBUG, "Actually Masquerading %s(%d) into the structure of %s(%d)\n",
2950                         clone->name, clone->_state, original->name, original->_state);
2951
2952         /* XXX This is a seriously wacked out operation.  We're essentially putting the guts of
2953            the clone channel into the original channel.  Start by killing off the original
2954            channel's backend.   I'm not sure we're going to keep this function, because
2955            while the features are nice, the cost is very high in terms of pure nastiness. XXX */
2956
2957         /* We need the clone's lock, too */
2958         ast_channel_lock(clone);
2959
2960         if (option_debug > 1)
2961                 ast_log(LOG_DEBUG, "Got clone lock for masquerade on '%s' at %p\n", clone->name, &clone->lock);
2962
2963         /* Having remembered the original read/write formats, we turn off any translation on either
2964            one */
2965         free_translation(clone);
2966         free_translation(original);
2967
2968
2969         /* Unlink the masquerade */
2970         original->masq = NULL;
2971         clone->masqr = NULL;
2972         
2973         /* Save the original name */
2974         ast_copy_string(orig, original->name, sizeof(orig));
2975         /* Save the new name */
2976         ast_copy_string(newn, clone->name, sizeof(newn));
2977         /* Create the masq name */
2978         snprintf(masqn, sizeof(masqn), "%s<MASQ>", newn);
2979                 
2980         /* Copy the name from the clone channel */
2981         ast_string_field_set(original, name, newn);
2982
2983         /* Mangle the name of the clone channel */
2984         ast_string_field_set(clone, name, masqn);
2985         
2986         /* Notify any managers of the change, first the masq then the other */
2987         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", newn, masqn, clone->uniqueid);
2988         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", orig, newn, original->uniqueid);
2989
2990         /* Swap the technologies */     
2991         t = original->tech;
2992         original->tech = clone->tech;
2993         clone->tech = t;
2994
2995         t_pvt = original->tech_pvt;
2996         original->tech_pvt = clone->tech_pvt;
2997         clone->tech_pvt = t_pvt;
2998
2999         /* Swap the readq's */
3000         cur = original->readq;
3001         original->readq = clone->readq;
3002         clone->readq = cur;
3003
3004         /* Swap the alertpipes */
3005         for (i = 0; i < 2; i++) {
3006                 x = original->alertpipe[i];
3007                 original->alertpipe[i] = clone->alertpipe[i];
3008                 clone->alertpipe[i] = x;
3009         }
3010
3011         /* Swap the raw formats */
3012         x = original->rawreadformat;
3013         original->rawreadformat = clone->rawreadformat;
3014         clone->rawreadformat = x;
3015         x = original->rawwriteformat;
3016         original->rawwriteformat = clone->rawwriteformat;
3017         clone->rawwriteformat = x;
3018
3019         /* Save any pending frames on both sides.  Start by counting
3020          * how many we're going to need... */
3021         prev = NULL;
3022         x = 0;
3023         for (cur = clone->readq; cur; cur = cur->next) {
3024                 x++;
3025                 prev = cur;
3026         }
3027         /* If we had any, prepend them to the ones already in the queue, and
3028          * load up the alertpipe */
3029         if (prev) {
3030                 prev->next = original->readq;
3031                 original->readq = clone->readq;
3032                 clone->readq = NULL;
3033                 if (original->alertpipe[1] > -1) {
3034                         for (i = 0; i < x; i++)
3035                                 write(original->alertpipe[1], &x, sizeof(x));
3036                 }
3037         }
3038         clone->_softhangup = AST_SOFTHANGUP_DEV;
3039
3040
3041         /* And of course, so does our current state.  Note we need not
3042            call ast_setstate since the event manager doesn't really consider
3043            these separate.  We do this early so that the clone has the proper
3044            state of the original channel. */
3045         origstate = original->_state;
3046         original->_state = clone->_state;
3047         clone->_state = origstate;
3048
3049         if (clone->tech->fixup){
3050                 res = clone->tech->fixup(original, clone);
3051                 if (res)
3052                         ast_log(LOG_WARNING, "Fixup failed on channel %s, strange things may happen.\n", clone->name);
3053         }
3054
3055         /* Start by disconnecting the original's physical side */
3056         if (clone->tech->hangup)
3057                 res = clone->tech->hangup(clone);
3058         if (res) {
3059                 ast_log(LOG_WARNING, "Hangup failed!  Strange things may happen!\n");
3060                 ast_channel_unlock(clone);
3061                 return -1;
3062         }
3063         
3064         snprintf(zombn, sizeof(zombn), "%s<ZOMBIE>", orig);
3065         /* Mangle the name of the clone channel */
3066         ast_string_field_set(clone, name, zombn);
3067         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", masqn, zombn, clone->uniqueid);
3068
3069         /* Update the type. */
3070         t_pvt = original->monitor;
3071         original->monitor = clone->monitor;
3072         clone->monitor = t_pvt;
3073         
3074         /* Keep the same language.  */
3075         ast_string_field_set(original, language, clone->language);
3076         /* Copy the FD's other than the generator fd */
3077         for (x = 0; x < AST_MAX_FDS; x++) {
3078                 if (x != AST_GENERATOR_FD)
3079                         original->fds[x] = clone->fds[x];
3080         }
3081         /* Move data stores over */
3082         if (AST_LIST_FIRST(&clone->datastores))
3083                 AST_LIST_INSERT_TAIL(&original->datastores, AST_LIST_FIRST(&clone->datastores), entry);
3084         AST_LIST_HEAD_INIT_NOLOCK(&clone->datastores);
3085
3086         clone_variables(original, clone);
3087         AST_LIST_HEAD_INIT_NOLOCK(&clone->varshead);
3088         /* Presense of ADSI capable CPE follows clone */
3089         original->adsicpe = clone->adsicpe;
3090         /* Bridge remains the same */
3091         /* CDR fields remain the same */
3092         /* XXX What about blocking, softhangup, blocker, and lock and blockproc? XXX */
3093         /* Application and data remain the same */
3094         /* Clone exception  becomes real one, as with fdno */
3095         ast_copy_flags(original, clone, AST_FLAG_EXCEPTION);
3096         original->fdno = clone->fdno;
3097         /* Schedule context remains the same */
3098         /* Stream stuff stays the same */
3099         /* Keep the original state.  The fixup code will need to work with it most likely */
3100
3101         /* Just swap the whole structures, nevermind the allocations, they'll work themselves
3102            out. */
3103         tmpcid = original->cid;
3104         original->cid = clone->cid;
3105         clone->cid = tmpcid;
3106         
3107         /* Restore original timing file descriptor */
3108         original->fds[AST_TIMING_FD] = original->timingfd;
3109         
3110         /* Our native formats are different now */
3111         original->nativeformats = clone->nativeformats;
3112         
3113         /* Context, extension, priority, app data, jump table,  remain the same */
3114         /* pvt switches.  pbx stays the same, as does next */
3115         
3116         /* Set the write format */
3117         ast_set_write_format(original, wformat);
3118
3119         /* Set the read format */
3120         ast_set_read_format(original, rformat);
3121
3122         /* Copy the music class */
3123         ast_string_field_set(original, musicclass, clone->musicclass);
3124
3125         if (option_debug)
3126                 ast_log(LOG_DEBUG, "Putting channel %s in %d/%d formats\n", original->name, wformat, rformat);
3127
3128         /* Okay.  Last thing is to let the channel driver know about all this mess, so he
3129            can fix up everything as best as possible */
3130         if (original->tech->fixup) {
3131                 res = original->tech->fixup(clone, original);
3132                 if (res) {
3133                         ast_log(LOG_WARNING, "Channel for type '%s' could not fixup channel %s\n",
3134                                 original->tech->type, original->name);
3135                         ast_channel_unlock(clone);
3136                         return -1;
3137                 }
3138         } else
3139                 ast_log(LOG_WARNING, "Channel type '%s' does not have a fixup routine (for %s)!  Bad things may happen.\n",
3140                         original->tech->type, original->name);