use an enum for control frame types
[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 #include "asterisk.h"
36
37 #ifdef HAVE_ZAPTEL
38 #include <sys/ioctl.h>
39 #ifdef __linux__
40 #include <linux/zaptel.h>
41 #else
42 #include <zaptel.h>
43 #endif /* __linux__ */
44 #ifndef ZT_TIMERPING
45 #error "You need newer zaptel!  Please cvs update zaptel"
46 #endif
47 #endif
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_channel_lock(chan);
317         res = ast_check_hangup(chan);
318         ast_channel_unlock(chan);
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_calloc(1, 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 HAVE_ZAPTEL
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_channel_lock(chan);
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_channel_unlock(chan);
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_channel_unlock(chan);
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 HAVE_ZAPTEL
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_channel_unlock(chan);
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_channel_trylock(chan)) {
734                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
735                 ast_channel_unlock(chan);
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, enum ast_control_frame_type control)
742 {
743         struct ast_frame f = { AST_FRAME_CONTROL, };
744
745         f.subclass = control;
746
747         return ast_queue_frame(chan, &f);
748 }
749
750 /*! \brief Queue a control frame with payload */
751 int ast_queue_control_data(struct ast_channel *chan, enum ast_control_frame_type control,
752                            const void *data, size_t datalen)
753 {
754         struct ast_frame f = { AST_FRAME_CONTROL, };
755
756         f.subclass = control;
757         f.data = (void *) data;
758         f.datalen = datalen;
759
760         return ast_queue_frame(chan, &f);
761 }
762
763 /*! \brief Set defer DTMF flag on channel */
764 int ast_channel_defer_dtmf(struct ast_channel *chan)
765 {
766         int pre = 0;
767
768         if (chan) {
769                 pre = ast_test_flag(chan, AST_FLAG_DEFER_DTMF);
770                 ast_set_flag(chan, AST_FLAG_DEFER_DTMF);
771         }
772         return pre;
773 }
774
775 /*! \brief Unset defer DTMF flag on channel */
776 void ast_channel_undefer_dtmf(struct ast_channel *chan)
777 {
778         if (chan)
779                 ast_clear_flag(chan, AST_FLAG_DEFER_DTMF);
780 }
781
782 /*!
783  * \brief Helper function to find channels.
784  *
785  * It supports these modes:
786  *
787  * prev != NULL : get channel next in list after prev
788  * name != NULL : get channel with matching name
789  * name != NULL && namelen != 0 : get channel whose name starts with prefix
790  * exten != NULL : get channel whose exten or macroexten matches
791  * context != NULL && exten != NULL : get channel whose context or macrocontext
792  *
793  * It returns with the channel's lock held. If getting the individual lock fails,
794  * unlock and retry quickly up to 10 times, then give up.
795  *
796  * \note XXX Note that this code has cost O(N) because of the need to verify
797  * that the object is still on the global list.
798  *
799  * \note XXX also note that accessing fields (e.g. c->name in ast_log())
800  * can only be done with the lock held or someone could delete the
801  * object while we work on it. This causes some ugliness in the code.
802  * Note that removing the first ast_log() may be harmful, as it would
803  * shorten the retry period and possibly cause failures.
804  * We should definitely go for a better scheme that is deadlock-free.
805  */
806 static struct ast_channel *channel_find_locked(const struct ast_channel *prev,
807                                                const char *name, const int namelen,
808                                                const char *context, const char *exten)
809 {
810         const char *msg = prev ? "deadlock" : "initial deadlock";
811         int retries;
812         struct ast_channel *c;
813
814         for (retries = 0; retries < 10; retries++) {
815                 int done;
816                 AST_LIST_LOCK(&channels);
817                 AST_LIST_TRAVERSE(&channels, c, chan_list) {
818                         if (prev) {     /* look for next item */
819                                 if (c != prev)  /* not this one */
820                                         continue;
821                                 /* found, prepare to return c->next */
822                                 c = AST_LIST_NEXT(c, chan_list);
823                         } else if (name) { /* want match by name */
824                                 if ( (!namelen && strcasecmp(c->name, name)) ||
825                                      (namelen && strncasecmp(c->name, name, namelen)) )
826                                         continue;       /* name match failed */
827                         } else if (exten) {
828                                 if (context && strcasecmp(c->context, context) &&
829                                                 strcasecmp(c->macrocontext, context))
830                                         continue;       /* context match failed */
831                                 if (strcasecmp(c->exten, exten) &&
832                                                 strcasecmp(c->macroexten, exten))
833                                         continue;       /* exten match failed */
834                         }
835                         /* if we get here, c points to the desired record */
836                         break;
837                 }
838                 /* exit if chan not found or mutex acquired successfully */
839                 /* this is slightly unsafe, as we _should_ hold the lock to access c->name */
840                 done = c == NULL || ast_channel_trylock(c) == 0;
841                 if (!done)
842                         ast_log(LOG_DEBUG, "Avoiding %s for channel '%p'\n", msg, c);
843                 AST_LIST_UNLOCK(&channels);
844                 if (done)
845                         return c;
846                 usleep(1);      /* give other threads a chance before retrying */
847         }
848         /*
849          * c is surely not null, but we don't have the lock so cannot
850          * access c->name
851          */
852         ast_log(LOG_DEBUG, "Failure, could not lock '%p' after %d retries!\n",
853                 c, retries);
854
855         return NULL;
856 }
857
858 /*! \brief Browse channels in use */
859 struct ast_channel *ast_channel_walk_locked(const struct ast_channel *prev)
860 {
861         return channel_find_locked(prev, NULL, 0, NULL, NULL);
862 }
863
864 /*! \brief Get channel by name and lock it */
865 struct ast_channel *ast_get_channel_by_name_locked(const char *name)
866 {
867         return channel_find_locked(NULL, name, 0, NULL, NULL);
868 }
869
870 /*! \brief Get channel by name prefix and lock it */
871 struct ast_channel *ast_get_channel_by_name_prefix_locked(const char *name, const int namelen)
872 {
873         return channel_find_locked(NULL, name, namelen, NULL, NULL);
874 }
875
876 /*! \brief Get next channel by name prefix and lock it */
877 struct ast_channel *ast_walk_channel_by_name_prefix_locked(struct ast_channel *chan, const char *name, const int namelen)
878 {
879         return channel_find_locked(chan, name, namelen, NULL, NULL);
880 }
881
882 /*! \brief Get channel by exten (and optionally context) and lock it */
883 struct ast_channel *ast_get_channel_by_exten_locked(const char *exten, const char *context)
884 {
885         return channel_find_locked(NULL, NULL, 0, context, exten);
886 }
887
888 /*! \brief Wait, look for hangups and condition arg */
889 int ast_safe_sleep_conditional(struct ast_channel *chan, int ms, int (*cond)(void*), void *data)
890 {
891         struct ast_frame *f;
892
893         while (ms > 0) {
894                 if (cond && ((*cond)(data) == 0))
895                         return 0;
896                 ms = ast_waitfor(chan, ms);
897                 if (ms < 0)
898                         return -1;
899                 if (ms > 0) {
900                         f = ast_read(chan);
901                         if (!f)
902                                 return -1;
903                         ast_frfree(f);
904                 }
905         }
906         return 0;
907 }
908
909 /*! \brief Wait, look for hangups */
910 int ast_safe_sleep(struct ast_channel *chan, int ms)
911 {
912         return ast_safe_sleep_conditional(chan, ms, NULL, NULL);
913 }
914
915 static void free_cid(struct ast_callerid *cid)
916 {
917         if (cid->cid_dnid)
918                 free(cid->cid_dnid);
919         if (cid->cid_num)
920                 free(cid->cid_num);     
921         if (cid->cid_name)
922                 free(cid->cid_name);    
923         if (cid->cid_ani)
924                 free(cid->cid_ani);
925         if (cid->cid_rdnis)
926                 free(cid->cid_rdnis);
927 }
928
929 /*! \brief Free a channel structure */
930 void ast_channel_free(struct ast_channel *chan)
931 {
932         int fd;
933         struct ast_var_t *vardata;
934         struct ast_frame *f, *fp;
935         struct varshead *headp;
936         struct ast_datastore *datastore = NULL;
937         char name[AST_CHANNEL_NAME];
938         
939         headp=&chan->varshead;
940         
941         AST_LIST_LOCK(&channels);
942         AST_LIST_REMOVE(&channels, chan, chan_list);
943         /* Lock and unlock the channel just to be sure nobody
944            has it locked still */
945         ast_channel_lock(chan);
946         ast_channel_unlock(chan);
947         if (chan->tech_pvt) {
948                 ast_log(LOG_WARNING, "Channel '%s' may not have been hung up properly\n", chan->name);
949                 free(chan->tech_pvt);
950         }
951
952         if (chan->sched)
953                 sched_context_destroy(chan->sched);
954
955         ast_copy_string(name, chan->name, sizeof(name));
956
957         /* Stop monitoring */
958         if (chan->monitor) {
959                 chan->monitor->stop( chan, 0 );
960         }
961
962         /* If there is native format music-on-hold state, free it */
963         if(chan->music_state)
964                 ast_moh_cleanup(chan);
965
966         /* Free translators */
967         if (chan->readtrans)
968                 ast_translator_free_path(chan->readtrans);
969         if (chan->writetrans)
970                 ast_translator_free_path(chan->writetrans);
971         if (chan->pbx)
972                 ast_log(LOG_WARNING, "PBX may not have been terminated properly on '%s'\n", chan->name);
973         free_cid(&chan->cid);
974         ast_mutex_destroy(&chan->lock);
975         /* Close pipes if appropriate */
976         if ((fd = chan->alertpipe[0]) > -1)
977                 close(fd);
978         if ((fd = chan->alertpipe[1]) > -1)
979                 close(fd);
980         if ((fd = chan->timingfd) > -1)
981                 close(fd);
982         f = chan->readq;
983         chan->readq = NULL;
984         while(f) {
985                 fp = f;
986                 f = f->next;
987                 ast_frfree(fp);
988         }
989         
990         /* Get rid of each of the data stores on the channel */
991         while ((datastore = AST_LIST_REMOVE_HEAD(&chan->datastores, entry)))
992                 /* Free the data store */
993                 ast_channel_datastore_free(datastore);
994         AST_LIST_HEAD_INIT_NOLOCK(&chan->datastores);
995
996         /* loop over the variables list, freeing all data and deleting list items */
997         /* no need to lock the list, as the channel is already locked */
998         
999         while ((vardata = AST_LIST_REMOVE_HEAD(headp, entries)))
1000                 ast_var_delete(vardata);
1001
1002         ast_string_field_free_all(chan);
1003         free(chan);
1004         AST_LIST_UNLOCK(&channels);
1005
1006         ast_device_state_changed_literal(name);
1007 }
1008
1009 struct ast_datastore *ast_channel_datastore_alloc(const struct ast_datastore_info *info, char *uid)
1010 {
1011         struct ast_datastore *datastore = NULL;
1012
1013         /* Make sure we at least have type so we can identify this */
1014         if (info == NULL) {
1015                 return NULL;
1016         }
1017
1018         /* Allocate memory for datastore and clear it */
1019         datastore = ast_calloc(1, sizeof(*datastore));
1020         if (datastore == NULL) {
1021                 return NULL;
1022         }
1023
1024         datastore->info = info;
1025
1026         datastore->uid = ast_strdup(uid);
1027
1028         return datastore;
1029 }
1030
1031 int ast_channel_datastore_free(struct ast_datastore *datastore)
1032 {
1033         int res = 0;
1034
1035         /* Using the destroy function (if present) destroy the data */
1036         if (datastore->info->destroy != NULL && datastore->data != NULL) {
1037                 datastore->info->destroy(datastore->data);
1038                 datastore->data = NULL;
1039         }
1040
1041         /* Free allocated UID memory */
1042         if (datastore->uid != NULL) {
1043                 free(datastore->uid);
1044                 datastore->uid = NULL;
1045         }
1046
1047         /* Finally free memory used by ourselves */
1048         free(datastore);
1049
1050         return res;
1051 }
1052
1053 int ast_channel_datastore_add(struct ast_channel *chan, struct ast_datastore *datastore)
1054 {
1055         int res = 0;
1056
1057         AST_LIST_INSERT_HEAD(&chan->datastores, datastore, entry);
1058
1059         return res;
1060 }
1061
1062 int ast_channel_datastore_remove(struct ast_channel *chan, struct ast_datastore *datastore)
1063 {
1064         struct ast_datastore *datastore2 = NULL;
1065         int res = -1;
1066
1067         /* Find our position and remove ourselves */
1068         AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->datastores, datastore2, entry) {
1069                 if (datastore2 == datastore) {
1070                         AST_LIST_REMOVE_CURRENT(&chan->datastores, entry);
1071                         res = 0;
1072                         break;
1073                 }
1074         }
1075         AST_LIST_TRAVERSE_SAFE_END
1076
1077         return res;
1078 }
1079
1080 struct ast_datastore *ast_channel_datastore_find(struct ast_channel *chan, const struct ast_datastore_info *info, char *uid)
1081 {
1082         struct ast_datastore *datastore = NULL;
1083         
1084         if (info == NULL)
1085                 return NULL;
1086
1087         AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->datastores, datastore, entry) {
1088                 if (datastore->info == info) {
1089                         if (uid != NULL && datastore->uid != NULL) {
1090                                 if (!strcasecmp(uid, datastore->uid)) {
1091                                         /* Matched by type AND uid */
1092                                         break;
1093                                 }
1094                         } else {
1095                                 /* Matched by type at least */
1096                                 break;
1097                         }
1098                 }
1099         }
1100         AST_LIST_TRAVERSE_SAFE_END
1101
1102         return datastore;
1103 }
1104
1105 int ast_channel_spy_add(struct ast_channel *chan, struct ast_channel_spy *spy)
1106 {
1107         if (!ast_test_flag(spy, CHANSPY_FORMAT_AUDIO)) {
1108                 ast_log(LOG_WARNING, "Could not add channel spy '%s' to channel '%s', only audio format spies are supported.\n",
1109                         spy->type, chan->name);
1110                 return -1;
1111         }
1112
1113         if (ast_test_flag(spy, CHANSPY_READ_VOLADJUST) && (spy->read_queue.format != AST_FORMAT_SLINEAR)) {
1114                 ast_log(LOG_WARNING, "Cannot provide volume adjustment on '%s' format spies\n",
1115                         ast_getformatname(spy->read_queue.format));
1116                 return -1;
1117         }
1118
1119         if (ast_test_flag(spy, CHANSPY_WRITE_VOLADJUST) && (spy->write_queue.format != AST_FORMAT_SLINEAR)) {
1120                 ast_log(LOG_WARNING, "Cannot provide volume adjustment on '%s' format spies\n",
1121                         ast_getformatname(spy->write_queue.format));
1122                 return -1;
1123         }
1124
1125         if (ast_test_flag(spy, CHANSPY_MIXAUDIO) &&
1126             ((spy->read_queue.format != AST_FORMAT_SLINEAR) ||
1127              (spy->write_queue.format != AST_FORMAT_SLINEAR))) {
1128                 ast_log(LOG_WARNING, "Cannot provide audio mixing on '%s'-'%s' format spies\n",
1129                         ast_getformatname(spy->read_queue.format), ast_getformatname(spy->write_queue.format));
1130                 return -1;
1131         }
1132
1133         if (!chan->spies) {
1134                 if (!(chan->spies = ast_calloc(1, sizeof(*chan->spies)))) {
1135                         return -1;
1136                 }
1137
1138                 AST_LIST_HEAD_INIT_NOLOCK(&chan->spies->list);
1139                 AST_LIST_INSERT_HEAD(&chan->spies->list, spy, list);
1140         } else {
1141                 AST_LIST_INSERT_TAIL(&chan->spies->list, spy, list);
1142         }
1143
1144         if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE) {
1145                 ast_cond_init(&spy->trigger, NULL);
1146                 ast_set_flag(spy, CHANSPY_TRIGGER_READ);
1147                 ast_clear_flag(spy, CHANSPY_TRIGGER_WRITE);
1148         }
1149
1150         ast_log(LOG_DEBUG, "Spy %s added to channel %s\n",
1151                 spy->type, chan->name);
1152
1153         return 0;
1154 }
1155
1156 void ast_channel_spy_stop_by_type(struct ast_channel *chan, const char *type)
1157 {
1158         struct ast_channel_spy *spy;
1159         
1160         if (!chan->spies)
1161                 return;
1162
1163         AST_LIST_TRAVERSE(&chan->spies->list, spy, list) {
1164                 ast_mutex_lock(&spy->lock);
1165                 if ((spy->type == type) && (spy->status == CHANSPY_RUNNING)) {
1166                         spy->status = CHANSPY_STOP;
1167                         if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE)
1168                                 ast_cond_signal(&spy->trigger);
1169                 }
1170                 ast_mutex_unlock(&spy->lock);
1171         }
1172 }
1173
1174 void ast_channel_spy_trigger_wait(struct ast_channel_spy *spy)
1175 {
1176         ast_cond_wait(&spy->trigger, &spy->lock);
1177 }
1178
1179 void ast_channel_spy_remove(struct ast_channel *chan, struct ast_channel_spy *spy)
1180 {
1181         struct ast_frame *f;
1182
1183         if (!chan->spies)
1184                 return;
1185
1186         AST_LIST_REMOVE(&chan->spies->list, spy, list);
1187
1188         ast_mutex_lock(&spy->lock);
1189
1190         for (f = spy->read_queue.head; f; f = spy->read_queue.head) {
1191                 spy->read_queue.head = f->next;
1192                 ast_frfree(f);
1193         }
1194         for (f = spy->write_queue.head; f; f = spy->write_queue.head) {
1195                 spy->write_queue.head = f->next;
1196                 ast_frfree(f);
1197         }
1198
1199         if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE)
1200                 ast_cond_destroy(&spy->trigger);
1201
1202         ast_mutex_unlock(&spy->lock);
1203
1204         ast_log(LOG_DEBUG, "Spy %s removed from channel %s\n",
1205                 spy->type, chan->name);
1206
1207         if (AST_LIST_EMPTY(&chan->spies->list)) {
1208                 if (chan->spies->read_translator.path)
1209                         ast_translator_free_path(chan->spies->read_translator.path);
1210                 if (chan->spies->write_translator.path)
1211                         ast_translator_free_path(chan->spies->write_translator.path);
1212                 free(chan->spies);
1213                 chan->spies = NULL;
1214         }
1215 }
1216
1217 static void detach_spies(struct ast_channel *chan)
1218 {
1219         struct ast_channel_spy *spy;
1220
1221         if (!chan->spies)
1222                 return;
1223
1224         /* Marking the spies as done is sufficient.  Chanspy or spy users will get the picture. */
1225         AST_LIST_TRAVERSE(&chan->spies->list, spy, list) {
1226                 ast_mutex_lock(&spy->lock);
1227                 if (spy->status == CHANSPY_RUNNING)
1228                         spy->status = CHANSPY_DONE;
1229                 if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE)
1230                         ast_cond_signal(&spy->trigger);
1231                 ast_mutex_unlock(&spy->lock);
1232         }
1233
1234         AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->spies->list, spy, list)
1235                 ast_channel_spy_remove(chan, spy);
1236         AST_LIST_TRAVERSE_SAFE_END;
1237 }
1238
1239 /*! \brief Softly hangup a channel, don't lock */
1240 int ast_softhangup_nolock(struct ast_channel *chan, int cause)
1241 {
1242         if (option_debug)
1243                 ast_log(LOG_DEBUG, "Soft-Hanging up channel '%s'\n", chan->name);
1244         /* Inform channel driver that we need to be hung up, if it cares */
1245         chan->_softhangup |= cause;
1246         ast_queue_frame(chan, &ast_null_frame);
1247         /* Interrupt any poll call or such */
1248         if (ast_test_flag(chan, AST_FLAG_BLOCKING))
1249                 pthread_kill(chan->blocker, SIGURG);
1250         return 0;
1251 }
1252
1253 /*! \brief Softly hangup a channel, lock */
1254 int ast_softhangup(struct ast_channel *chan, int cause)
1255 {
1256         int res;
1257         ast_channel_lock(chan);
1258         res = ast_softhangup_nolock(chan, cause);
1259         ast_channel_unlock(chan);
1260         return res;
1261 }
1262
1263 enum spy_direction {
1264         SPY_READ,
1265         SPY_WRITE,
1266 };
1267
1268 #define SPY_QUEUE_SAMPLE_LIMIT 4000                     /* half of one second */
1269
1270 static void queue_frame_to_spies(struct ast_channel *chan, struct ast_frame *f, enum spy_direction dir)
1271 {
1272         struct ast_frame *translated_frame = NULL;
1273         struct ast_channel_spy *spy;
1274         struct channel_spy_trans *trans;
1275
1276         trans = (dir == SPY_READ) ? &chan->spies->read_translator : &chan->spies->write_translator;
1277
1278         AST_LIST_TRAVERSE(&chan->spies->list, spy, list) {
1279                 struct ast_frame *last;
1280                 struct ast_frame *f1;   /* the frame to append */
1281                 struct ast_channel_spy_queue *queue;
1282
1283                 ast_mutex_lock(&spy->lock);
1284
1285                 queue = (dir == SPY_READ) ? &spy->read_queue : &spy->write_queue;
1286
1287                 if ((queue->format == AST_FORMAT_SLINEAR) && (f->subclass != AST_FORMAT_SLINEAR)) {
1288                         if (!translated_frame) {
1289                                 if (trans->path && (trans->last_format != f->subclass)) {
1290                                         ast_translator_free_path(trans->path);
1291                                         trans->path = NULL;
1292                                 }
1293                                 if (!trans->path) {
1294                                         ast_log(LOG_DEBUG, "Building translator from %s to SLINEAR for spies on channel %s\n",
1295                                                 ast_getformatname(f->subclass), chan->name);
1296                                         if ((trans->path = ast_translator_build_path(AST_FORMAT_SLINEAR, f->subclass)) == NULL) {
1297                                                 ast_log(LOG_WARNING, "Cannot build a path from %s to %s\n",
1298                                                         ast_getformatname(f->subclass), ast_getformatname(AST_FORMAT_SLINEAR));
1299                                                 ast_mutex_unlock(&spy->lock);
1300                                                 continue;
1301                                         } else {
1302                                                 trans->last_format = f->subclass;
1303                                         }
1304                                 }
1305                                 if (!(translated_frame = ast_translate(trans->path, f, 0))) {
1306                                         ast_log(LOG_ERROR, "Translation to %s failed, dropping frame for spies\n",
1307                                                 ast_getformatname(AST_FORMAT_SLINEAR));
1308                                         ast_mutex_unlock(&spy->lock);
1309                                         break;
1310                                 }
1311                         }
1312                         f1 = translated_frame;
1313                 } else {
1314                         if (f->subclass != queue->format) {
1315                                 ast_log(LOG_WARNING, "Spy '%s' on channel '%s' wants format '%s', but frame is '%s', dropping\n",
1316                                         spy->type, chan->name,
1317                                         ast_getformatname(queue->format), ast_getformatname(f->subclass));
1318                                 ast_mutex_unlock(&spy->lock);
1319                                 continue;
1320                         }
1321                         f1 = f;
1322                 }
1323                 /* duplicate and append f1 to the tail */
1324                 f1 = ast_frdup(f1);
1325
1326                 for (last = queue->head; last && last->next; last = last->next)
1327                         ;
1328                 if (last)
1329                         last->next = f1;
1330                 else
1331                         queue->head = f1;
1332
1333                 queue->samples += f->samples;
1334
1335                 if (queue->samples > SPY_QUEUE_SAMPLE_LIMIT) {
1336                         if (ast_test_flag(spy, CHANSPY_TRIGGER_MODE) != CHANSPY_TRIGGER_NONE) {
1337                                 switch (ast_test_flag(spy, CHANSPY_TRIGGER_MODE)) {
1338                                 case CHANSPY_TRIGGER_READ:
1339                                         if (dir == SPY_WRITE) {
1340                                                 ast_set_flag(spy, CHANSPY_TRIGGER_WRITE);
1341                                                 ast_clear_flag(spy, CHANSPY_TRIGGER_READ);
1342                                                 if (option_debug)
1343                                                         ast_log(LOG_DEBUG, "Switching spy '%s' on '%s' to write-trigger mode\n",
1344                                                                 spy->type, chan->name);
1345                                         }
1346                                         break;
1347                                 case CHANSPY_TRIGGER_WRITE:
1348                                         if (dir == SPY_READ) {
1349                                                 ast_set_flag(spy, CHANSPY_TRIGGER_READ);
1350                                                 ast_clear_flag(spy, CHANSPY_TRIGGER_WRITE);
1351                                                 if (option_debug)
1352                                                         ast_log(LOG_DEBUG, "Switching spy '%s' on '%s' to read-trigger mode\n",
1353                                                                 spy->type, chan->name);
1354                                         }
1355                                         break;
1356                                 }
1357                                 if (option_debug)
1358                                         ast_log(LOG_DEBUG, "Triggering queue flush for spy '%s' on '%s'\n",
1359                                                 spy->type, chan->name);
1360                                 ast_set_flag(spy, CHANSPY_TRIGGER_FLUSH);
1361                                 ast_cond_signal(&spy->trigger);
1362                         } else {
1363                                 if (option_debug)
1364                                         ast_log(LOG_DEBUG, "Spy '%s' on channel '%s' %s queue too long, dropping frames\n",
1365                                                 spy->type, chan->name, (dir == SPY_READ) ? "read" : "write");
1366                                 while (queue->samples > SPY_QUEUE_SAMPLE_LIMIT) {
1367                                         struct ast_frame *drop = queue->head;
1368                                         
1369                                         queue->samples -= drop->samples;
1370                                         queue->head = drop->next;
1371                                         ast_frfree(drop);
1372                                 }
1373                         }
1374                 } else {
1375                         switch (ast_test_flag(spy, CHANSPY_TRIGGER_MODE)) {
1376                         case CHANSPY_TRIGGER_READ:
1377                                 if (dir == SPY_READ)
1378                                         ast_cond_signal(&spy->trigger);
1379                                 break;
1380                         case CHANSPY_TRIGGER_WRITE:
1381                                 if (dir == SPY_WRITE)
1382                                         ast_cond_signal(&spy->trigger);
1383                                 break;
1384                         }
1385                 }
1386
1387                 ast_mutex_unlock(&spy->lock);
1388         }
1389
1390         if (translated_frame)
1391                 ast_frfree(translated_frame);
1392 }
1393
1394 static void free_translation(struct ast_channel *clone)
1395 {
1396         if (clone->writetrans)
1397                 ast_translator_free_path(clone->writetrans);
1398         if (clone->readtrans)
1399                 ast_translator_free_path(clone->readtrans);
1400         clone->writetrans = NULL;
1401         clone->readtrans = NULL;
1402         clone->rawwriteformat = clone->nativeformats;
1403         clone->rawreadformat = clone->nativeformats;
1404 }
1405
1406 /*! \brief Hangup a channel */
1407 int ast_hangup(struct ast_channel *chan)
1408 {
1409         int res = 0;
1410
1411         /* Don't actually hang up a channel that will masquerade as someone else, or
1412            if someone is going to masquerade as us */
1413         ast_channel_lock(chan);
1414
1415         detach_spies(chan);             /* get rid of spies */
1416
1417         if (chan->masq) {
1418                 if (ast_do_masquerade(chan))
1419                         ast_log(LOG_WARNING, "Failed to perform masquerade\n");
1420         }
1421
1422         if (chan->masq) {
1423                 ast_log(LOG_WARNING, "%s getting hung up, but someone is trying to masq into us?!?\n", chan->name);
1424                 ast_channel_unlock(chan);
1425                 return 0;
1426         }
1427         /* If this channel is one which will be masqueraded into something,
1428            mark it as a zombie already, so we know to free it later */
1429         if (chan->masqr) {
1430                 ast_set_flag(chan, AST_FLAG_ZOMBIE);
1431                 ast_channel_unlock(chan);
1432                 return 0;
1433         }
1434         free_translation(chan);
1435         if (chan->stream)               /* Close audio stream */
1436                 ast_closestream(chan->stream);
1437         if (chan->vstream)              /* Close video stream */
1438                 ast_closestream(chan->vstream);
1439         if (chan->sched) {
1440                 sched_context_destroy(chan->sched);
1441                 chan->sched = NULL;
1442         }
1443         
1444         if (chan->generatordata)        /* Clear any tone stuff remaining */
1445                 chan->generator->release(chan, chan->generatordata);
1446         chan->generatordata = NULL;
1447         chan->generator = NULL;
1448         if (chan->cdr) {                /* End the CDR if it hasn't already */
1449                 ast_cdr_end(chan->cdr);
1450                 ast_cdr_detach(chan->cdr);      /* Post and Free the CDR */
1451                 chan->cdr = NULL;
1452         }
1453         if (ast_test_flag(chan, AST_FLAG_BLOCKING)) {
1454                 ast_log(LOG_WARNING, "Hard hangup called by thread %ld on %s, while fd "
1455                                         "is blocked by thread %ld in procedure %s!  Expect a failure\n",
1456                                         (long)pthread_self(), chan->name, (long)chan->blocker, chan->blockproc);
1457                 CRASH;
1458         }
1459         if (!ast_test_flag(chan, AST_FLAG_ZOMBIE)) {
1460                 if (option_debug)
1461                         ast_log(LOG_DEBUG, "Hanging up channel '%s'\n", chan->name);
1462                 if (chan->tech->hangup)
1463                         res = chan->tech->hangup(chan);
1464         } else {
1465                 if (option_debug)
1466                         ast_log(LOG_DEBUG, "Hanging up zombie '%s'\n", chan->name);
1467         }
1468                         
1469         ast_channel_unlock(chan);
1470         manager_event(EVENT_FLAG_CALL, "Hangup",
1471                         "Channel: %s\r\n"
1472                         "Uniqueid: %s\r\n"
1473                         "Cause: %d\r\n"
1474                         "Cause-txt: %s\r\n",
1475                         chan->name,
1476                         chan->uniqueid,
1477                         chan->hangupcause,
1478                         ast_cause2str(chan->hangupcause)
1479                         );
1480         ast_channel_free(chan);
1481         return res;
1482 }
1483
1484 int ast_answer(struct ast_channel *chan)
1485 {
1486         int res = 0;
1487         ast_channel_lock(chan);
1488         /* Stop if we're a zombie or need a soft hangup */
1489         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
1490                 ast_channel_unlock(chan);
1491                 return -1;
1492         }
1493         switch(chan->_state) {
1494         case AST_STATE_RINGING:
1495         case AST_STATE_RING:
1496                 if (chan->tech->answer)
1497                         res = chan->tech->answer(chan);
1498                 ast_setstate(chan, AST_STATE_UP);
1499                 ast_cdr_answer(chan->cdr);
1500                 break;
1501         case AST_STATE_UP:
1502                 ast_cdr_answer(chan->cdr);
1503                 break;
1504         }
1505         ast_channel_unlock(chan);
1506         return res;
1507 }
1508
1509 void ast_deactivate_generator(struct ast_channel *chan)
1510 {
1511         ast_channel_lock(chan);
1512         if (chan->generatordata) {
1513                 if (chan->generator && chan->generator->release)
1514                         chan->generator->release(chan, chan->generatordata);
1515                 chan->generatordata = NULL;
1516                 chan->generator = NULL;
1517                 chan->fds[AST_GENERATOR_FD] = -1;
1518                 ast_clear_flag(chan, AST_FLAG_WRITE_INT);
1519                 ast_settimeout(chan, 0, NULL, NULL);
1520         }
1521         ast_channel_unlock(chan);
1522 }
1523
1524 static int generator_force(void *data)
1525 {
1526         /* Called if generator doesn't have data */
1527         void *tmp;
1528         int res;
1529         int (*generate)(struct ast_channel *chan, void *tmp, int datalen, int samples);
1530         struct ast_channel *chan = data;
1531         tmp = chan->generatordata;
1532         chan->generatordata = NULL;
1533         generate = chan->generator->generate;
1534         res = generate(chan, tmp, 0, 160);
1535         chan->generatordata = tmp;
1536         if (res) {
1537                 ast_log(LOG_DEBUG, "Auto-deactivating generator\n");
1538                 ast_deactivate_generator(chan);
1539         }
1540         return 0;
1541 }
1542
1543 int ast_activate_generator(struct ast_channel *chan, struct ast_generator *gen, void *params)
1544 {
1545         int res = 0;
1546
1547         ast_channel_lock(chan);
1548
1549         if (chan->generatordata) {
1550                 if (chan->generator && chan->generator->release)
1551                         chan->generator->release(chan, chan->generatordata);
1552                 chan->generatordata = NULL;
1553         }
1554
1555         ast_prod(chan);
1556         if (gen->alloc && !(chan->generatordata = gen->alloc(chan, params))) {
1557                 res = -1;
1558         }
1559         
1560         if (!res) {
1561                 ast_settimeout(chan, 160, generator_force, chan);
1562                 chan->generator = gen;
1563         }
1564
1565         ast_channel_unlock(chan);
1566
1567         return res;
1568 }
1569
1570 /*! \brief Wait for x amount of time on a file descriptor to have input.  */
1571 int ast_waitfor_n_fd(int *fds, int n, int *ms, int *exception)
1572 {
1573         int winner = -1;
1574         ast_waitfor_nandfds(NULL, 0, fds, n, exception, &winner, ms);
1575         return winner;
1576 }
1577
1578 /*! \brief Wait for x amount of time on a file descriptor to have input.  */
1579 struct ast_channel *ast_waitfor_nandfds(struct ast_channel **c, int n, int *fds, int nfds,
1580         int *exception, int *outfd, int *ms)
1581 {
1582         struct timeval start = { 0 , 0 };
1583         struct pollfd *pfds;
1584         int res;
1585         long rms;
1586         int x, y, max;
1587         int sz;
1588         time_t now = 0;
1589         long whentohangup = 0, diff;
1590         struct ast_channel *winner = NULL;
1591         struct fdmap {
1592                 int chan;
1593                 int fdno;
1594         } *fdmap;
1595
1596         sz = n * AST_MAX_FDS + nfds;
1597         if (!(pfds = alloca(sizeof(*pfds) * sz)) || !(fdmap = alloca(sizeof(*fdmap) * sz))) {
1598                 ast_log(LOG_ERROR, "Out of memory\n");
1599                 *outfd = -1;
1600                 return NULL;
1601         }
1602
1603         if (outfd)
1604                 *outfd = -99999;
1605         if (exception)
1606                 *exception = 0;
1607         
1608         /* Perform any pending masquerades */
1609         for (x=0; x < n; x++) {
1610                 ast_channel_lock(c[x]);
1611                 if (c[x]->masq) {
1612                         if (ast_do_masquerade(c[x])) {
1613                                 ast_log(LOG_WARNING, "Masquerade failed\n");
1614                                 *ms = -1;
1615                                 ast_channel_unlock(c[x]);
1616                                 return NULL;
1617                         }
1618                 }
1619                 if (c[x]->whentohangup) {
1620                         if (!whentohangup)
1621                                 time(&now);
1622                         diff = c[x]->whentohangup - now;
1623                         if (diff < 1) {
1624                                 /* Should already be hungup */
1625                                 c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
1626                                 ast_channel_unlock(c[x]);
1627                                 return c[x];
1628                         }
1629                         if (!whentohangup || (diff < whentohangup))
1630                                 whentohangup = diff;
1631                 }
1632                 ast_channel_unlock(c[x]);
1633         }
1634         /* Wait full interval */
1635         rms = *ms;
1636         if (whentohangup) {
1637                 rms = (whentohangup - now) * 1000;      /* timeout in milliseconds */
1638                 if (*ms >= 0 && *ms < rms)              /* original *ms still smaller */
1639                         rms =  *ms;
1640         }
1641         /*
1642          * Build the pollfd array, putting the channels' fds first,
1643          * followed by individual fds. Order is important because
1644          * individual fd's must have priority over channel fds.
1645          */
1646         max = 0;
1647         for (x=0; x<n; x++) {
1648                 for (y=0; y<AST_MAX_FDS; y++) {
1649                         fdmap[max].fdno = y;  /* fd y is linked to this pfds */
1650                         fdmap[max].chan = x;  /* channel x is linked to this pfds */
1651                         max += ast_add_fd(&pfds[max], c[x]->fds[y]);
1652                 }
1653                 CHECK_BLOCKING(c[x]);
1654         }
1655         /* Add the individual fds */
1656         for (x=0; x<nfds; x++) {
1657                 fdmap[max].chan = -1;
1658                 max += ast_add_fd(&pfds[max], fds[x]);
1659         }
1660
1661         if (*ms > 0)
1662                 start = ast_tvnow();
1663         
1664         if (sizeof(int) == 4) { /* XXX fix timeout > 600000 on linux x86-32 */
1665                 do {
1666                         int kbrms = rms;
1667                         if (kbrms > 600000)
1668                                 kbrms = 600000;
1669                         res = poll(pfds, max, kbrms);
1670                         if (!res)
1671                                 rms -= kbrms;
1672                 } while (!res && (rms > 0));
1673         } else {
1674                 res = poll(pfds, max, rms);
1675         }
1676         for (x=0; x<n; x++)
1677                 ast_clear_flag(c[x], AST_FLAG_BLOCKING);
1678         if (res < 0) { /* Simulate a timeout if we were interrupted */
1679                 if (errno != EINTR)
1680                         *ms = -1;
1681                 return NULL;
1682         }
1683         if (whentohangup) {   /* if we have a timeout, check who expired */
1684                 time(&now);
1685                 for (x=0; x<n; x++) {
1686                         if (c[x]->whentohangup && now >= c[x]->whentohangup) {
1687                                 c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
1688                                 if (winner == NULL)
1689                                         winner = c[x];
1690                         }
1691                 }
1692         }
1693         if (res == 0) { /* no fd ready, reset timeout and done */
1694                 *ms = 0;        /* XXX use 0 since we may not have an exact timeout. */
1695                 return winner;
1696         }
1697         /*
1698          * Then check if any channel or fd has a pending event.
1699          * Remember to check channels first and fds last, as they
1700          * must have priority on setting 'winner'
1701          */
1702         for (x = 0; x < max; x++) {
1703                 res = pfds[x].revents;
1704                 if (res == 0)
1705                         continue;
1706                 if (fdmap[x].chan >= 0) {       /* this is a channel */
1707                         winner = c[fdmap[x].chan];      /* override previous winners */
1708                         if (res & POLLPRI)
1709                                 ast_set_flag(winner, AST_FLAG_EXCEPTION);
1710                         else
1711                                 ast_clear_flag(winner, AST_FLAG_EXCEPTION);
1712                         winner->fdno = fdmap[x].fdno;
1713                 } else {                        /* this is an fd */
1714                         if (outfd)
1715                                 *outfd = pfds[x].fd;
1716                         if (exception)
1717                                 *exception = (res & POLLPRI) ? -1 : 0;
1718                         winner = NULL;
1719                 }
1720         }
1721         if (*ms > 0) {
1722                 *ms -= ast_tvdiff_ms(ast_tvnow(), start);
1723                 if (*ms < 0)
1724                         *ms = 0;
1725         }
1726         return winner;
1727 }
1728
1729 struct ast_channel *ast_waitfor_n(struct ast_channel **c, int n, int *ms)
1730 {
1731         return ast_waitfor_nandfds(c, n, NULL, 0, NULL, NULL, ms);
1732 }
1733
1734 int ast_waitfor(struct ast_channel *c, int ms)
1735 {
1736         int oldms = ms; /* -1 if no timeout */
1737
1738         ast_waitfor_nandfds(&c, 1, NULL, 0, NULL, NULL, &ms);
1739         if ((ms < 0) && (oldms < 0))
1740                 ms = 0;
1741         return ms;
1742 }
1743
1744 /* XXX never to be called with ms = -1 */
1745 int ast_waitfordigit(struct ast_channel *c, int ms)
1746 {
1747         return ast_waitfordigit_full(c, ms, -1, -1);
1748 }
1749
1750 int ast_settimeout(struct ast_channel *c, int samples, int (*func)(void *data), void *data)
1751 {
1752         int res = -1;
1753 #ifdef HAVE_ZAPTEL
1754         if (c->timingfd > -1) {
1755                 if (!func) {
1756                         samples = 0;
1757                         data = 0;
1758                 }
1759                 ast_log(LOG_DEBUG, "Scheduling timer at %d sample intervals\n", samples);
1760                 res = ioctl(c->timingfd, ZT_TIMERCONFIG, &samples);
1761                 c->timingfunc = func;
1762                 c->timingdata = data;
1763         }
1764 #endif  
1765         return res;
1766 }
1767
1768 int ast_waitfordigit_full(struct ast_channel *c, int ms, int audiofd, int cmdfd)
1769 {
1770
1771         /* Stop if we're a zombie or need a soft hangup */
1772         if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
1773                 return -1;
1774         /* Wait for a digit, no more than ms milliseconds total. */
1775         while (ms) {
1776                 struct ast_channel *rchan;
1777                 int outfd;
1778
1779                 errno = 0;
1780                 rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
1781                 if (!rchan && outfd < 0 && ms) {
1782                         if (errno == 0 || errno == EINTR)
1783                                 continue;
1784                         ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
1785                         return -1;
1786                 } else if (outfd > -1) {
1787                         /* The FD we were watching has something waiting */
1788                         return 1;
1789                 } else if (rchan) {
1790                         int res;
1791                         struct ast_frame *f = ast_read(c);
1792                         if (!f)
1793                                 return -1;
1794
1795                         switch(f->frametype) {
1796                         case AST_FRAME_DTMF:
1797                                 res = f->subclass;
1798                                 ast_frfree(f);
1799                                 return res;
1800                         case AST_FRAME_CONTROL:
1801                                 switch(f->subclass) {
1802                                 case AST_CONTROL_HANGUP:
1803                                         ast_frfree(f);
1804                                         return -1;
1805                                 case AST_CONTROL_RINGING:
1806                                 case AST_CONTROL_ANSWER:
1807                                         /* Unimportant */
1808                                         break;
1809                                 default:
1810                                         ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", f->subclass);
1811                                 }
1812                         case AST_FRAME_VOICE:
1813                                 /* Write audio if appropriate */
1814                                 if (audiofd > -1)
1815                                         write(audiofd, f->data, f->datalen);
1816                         }
1817                         /* Ignore */
1818                         ast_frfree(f);
1819                 }
1820         }
1821         return 0; /* Time is up */
1822 }
1823
1824 static struct ast_frame *__ast_read(struct ast_channel *chan, int dropaudio)
1825 {
1826         struct ast_frame *f = NULL;     /* the return value */
1827         int blah;
1828         int prestate;
1829
1830         /* this function is very long so make sure there is only one return
1831          * point at the end (there is only one exception to this).
1832          */
1833         ast_channel_lock(chan);
1834         if (chan->masq) {
1835                 if (ast_do_masquerade(chan)) {
1836                         ast_log(LOG_WARNING, "Failed to perform masquerade\n");
1837                 } else {
1838                         f =  &ast_null_frame;
1839                 }
1840                 goto done;
1841         }
1842
1843         /* Stop if we're a zombie or need a soft hangup */
1844         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
1845                 if (chan->generator)
1846                         ast_deactivate_generator(chan);
1847                 goto done;
1848         }
1849         prestate = chan->_state;
1850
1851         if (!ast_test_flag(chan, AST_FLAG_DEFER_DTMF) && !ast_strlen_zero(chan->dtmfq)) {
1852                 /* We have DTMF that has been deferred.  Return it now */
1853                 chan->dtmff.frametype = AST_FRAME_DTMF;
1854                 chan->dtmff.subclass = chan->dtmfq[0];
1855                 /* Drop first digit from the buffer */
1856                 memmove(chan->dtmfq, chan->dtmfq + 1, sizeof(chan->dtmfq) - 1);
1857                 f = &chan->dtmff;
1858                 goto done;
1859         }
1860         
1861         /* Read and ignore anything on the alertpipe, but read only
1862            one sizeof(blah) per frame that we send from it */
1863         if (chan->alertpipe[0] > -1)
1864                 read(chan->alertpipe[0], &blah, sizeof(blah));
1865
1866 #ifdef HAVE_ZAPTEL
1867         if (chan->timingfd > -1 && chan->fdno == AST_TIMING_FD && ast_test_flag(chan, AST_FLAG_EXCEPTION)) {
1868                 int res;
1869
1870                 ast_clear_flag(chan, AST_FLAG_EXCEPTION);
1871                 blah = -1;
1872                 /* IF we can't get event, assume it's an expired as-per the old interface */
1873                 res = ioctl(chan->timingfd, ZT_GETEVENT, &blah);
1874                 if (res)
1875                         blah = ZT_EVENT_TIMER_EXPIRED;
1876
1877                 if (blah == ZT_EVENT_TIMER_PING) {
1878                         if (!chan->readq || !chan->readq->next) {
1879                                 /* Acknowledge PONG unless we need it again */
1880                                 if (ioctl(chan->timingfd, ZT_TIMERPONG, &blah)) {
1881                                         ast_log(LOG_WARNING, "Failed to pong timer on '%s': %s\n", chan->name, strerror(errno));
1882                                 }
1883                         }
1884                 } else if (blah == ZT_EVENT_TIMER_EXPIRED) {
1885                         ioctl(chan->timingfd, ZT_TIMERACK, &blah);
1886                         if (chan->timingfunc) {
1887                                 /* save a copy of func/data before unlocking the channel */
1888                                 int (*func)(void *) = chan->timingfunc;
1889                                 void *data = chan->timingdata;
1890                                 ast_channel_unlock(chan);
1891                                 func(data);
1892                         } else {
1893                                 blah = 0;
1894                                 ioctl(chan->timingfd, ZT_TIMERCONFIG, &blah);
1895                                 chan->timingdata = NULL;
1896                                 ast_channel_unlock(chan);
1897                         }
1898                         /* cannot 'goto done' because the channel is already unlocked */
1899                         return &ast_null_frame;
1900                 } else
1901                         ast_log(LOG_NOTICE, "No/unknown event '%d' on timer for '%s'?\n", blah, chan->name);
1902         } else
1903 #endif
1904         if (chan->fds[AST_GENERATOR_FD] > -1 && chan->fdno == AST_GENERATOR_FD) {
1905                 /* if the AST_GENERATOR_FD is set, call the generator with args
1906                  * set to -1 so it can do whatever it needs to.
1907                  */
1908                 void *tmp = chan->generatordata;
1909                 chan->generatordata = NULL;     /* reset to let ast_write get through */
1910                 chan->generator->generate(chan, tmp, -1, -1);
1911                 chan->generatordata = tmp;
1912                 f = &ast_null_frame;
1913                 goto done;
1914         }
1915
1916         /* Check for pending read queue */
1917         if (chan->readq) {
1918                 f = chan->readq;
1919                 chan->readq = f->next;
1920                 f->next = NULL;
1921                 /* Interpret hangup and return NULL */
1922                 /* XXX why not the same for frames from the channel ? */
1923                 if (f->frametype == AST_FRAME_CONTROL && f->subclass == AST_CONTROL_HANGUP) {
1924                         ast_frfree(f);
1925                         f = NULL;
1926                 }
1927         } else {
1928                 chan->blocker = pthread_self();
1929                 if (ast_test_flag(chan, AST_FLAG_EXCEPTION)) {
1930                         if (chan->tech->exception)
1931                                 f = chan->tech->exception(chan);
1932                         else {
1933                                 ast_log(LOG_WARNING, "Exception flag set on '%s', but no exception handler\n", chan->name);
1934                                 f = &ast_null_frame;
1935                         }
1936                         /* Clear the exception flag */
1937                         ast_clear_flag(chan, AST_FLAG_EXCEPTION);
1938                 } else if (chan->tech->read)
1939                         f = chan->tech->read(chan);
1940                 else
1941                         ast_log(LOG_WARNING, "No read routine on channel %s\n", chan->name);
1942         }
1943
1944         if (f) {
1945                 /* if the channel driver returned more than one frame, stuff the excess
1946                    into the readq for the next ast_read call
1947                 */
1948                 if (f->next) {
1949                         chan->readq = f->next;
1950                         f->next = NULL;
1951                 }
1952
1953                 switch (f->frametype) {
1954                 case AST_FRAME_CONTROL:
1955                         if (f->subclass == AST_CONTROL_ANSWER) {
1956                                 if (prestate == AST_STATE_UP) {
1957                                         ast_log(LOG_DEBUG, "Dropping duplicate answer!\n");
1958                                         f = &ast_null_frame;
1959                                 }
1960                                 /* Answer the CDR */
1961                                 ast_setstate(chan, AST_STATE_UP);
1962                                 ast_cdr_answer(chan->cdr);
1963                         }
1964                         break;
1965                 case AST_FRAME_DTMF:
1966                         ast_log(LOG_DTMF, "DTMF '%c' received on %s\n", f->subclass, chan->name);
1967                         if (ast_test_flag(chan, AST_FLAG_DEFER_DTMF)) {
1968                                 if (strlen(chan->dtmfq) < sizeof(chan->dtmfq) - 2)
1969                                         chan->dtmfq[strlen(chan->dtmfq)] = f->subclass;
1970                                 else
1971                                         ast_log(LOG_WARNING, "Dropping deferred DTMF digits on %s\n", chan->name);
1972                                 f = &ast_null_frame;
1973                         }
1974                         break;
1975                 case AST_FRAME_DTMF_BEGIN:
1976                         ast_log(LOG_DTMF, "DTMF begin '%c' received on %s\n", f->subclass, chan->name);
1977                         break;
1978                 case AST_FRAME_DTMF_END:
1979                         ast_log(LOG_DTMF, "DTMF end '%c' received on %s\n", f->subclass, chan->name);
1980                         break;
1981                 case AST_FRAME_VOICE:
1982                         if (dropaudio) {
1983                                 ast_frfree(f);
1984                                 f = &ast_null_frame;
1985                         } else if (!(f->subclass & chan->nativeformats)) {
1986                                 /* This frame can't be from the current native formats -- drop it on the
1987                                    floor */
1988                                 ast_log(LOG_NOTICE, "Dropping incompatible voice frame on %s of format %s since our native format has changed to %s\n",
1989                                         chan->name, ast_getformatname(f->subclass), ast_getformatname(chan->nativeformats));
1990                                 ast_frfree(f);
1991                                 f = &ast_null_frame;
1992                         } else {
1993                                 if (chan->spies)
1994                                         queue_frame_to_spies(chan, f, SPY_READ);
1995                                 
1996                                 if (chan->monitor && chan->monitor->read_stream ) {
1997                                         /* XXX what does this do ? */
1998 #ifndef MONITOR_CONSTANT_DELAY
1999                                         int jump = chan->outsmpl - chan->insmpl - 4 * f->samples;
2000                                         if (jump >= 0) {
2001                                                 if (ast_seekstream(chan->monitor->read_stream, jump + f->samples, SEEK_FORCECUR) == -1)
2002                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring read stream, synchronization between the files may be broken\n");
2003                                                 chan->insmpl += jump + 4 * f->samples;
2004                                         } else
2005                                                 chan->insmpl+= f->samples;
2006 #else
2007                                         int jump = chan->outsmpl - chan->insmpl;
2008                                         if (jump - MONITOR_DELAY >= 0) {
2009                                                 if (ast_seekstream(chan->monitor->read_stream, jump - f->samples, SEEK_FORCECUR) == -1)
2010                                                         ast_log(LOG_WARNING, "Failed to perform seek in monitoring read stream, synchronization between the files may be broken\n");
2011                                                 chan->insmpl += jump;
2012                                         } else
2013                                                 chan->insmpl += f->samples;
2014 #endif
2015                                         if (chan->monitor->state == AST_MONITOR_RUNNING) {
2016                                                 if (ast_writestream(chan->monitor->read_stream, f) < 0)
2017                                                         ast_log(LOG_WARNING, "Failed to write data to channel monitor read stream\n");
2018                                         }
2019                                 }
2020
2021                                 if (chan->readtrans && (f = ast_translate(chan->readtrans, f, 1)) == NULL)
2022                                         f = &ast_null_frame;
2023
2024                                 /* Run generator sitting on the line if timing device not available
2025                                 * and synchronous generation of outgoing frames is necessary       */
2026                                 if (chan->generatordata &&  !ast_internal_timing_enabled(chan)) {
2027                                         void *tmp = chan->generatordata;
2028                                         int res;
2029
2030                                         if (chan->timingfunc) {
2031                                                 if (option_debug > 1)
2032                                                         ast_log(LOG_DEBUG, "Generator got voice, switching to phase locked mode\n");
2033                                                 ast_settimeout(chan, 0, NULL, NULL);
2034                                         }
2035
2036                                         chan->generatordata = NULL;     /* reset, to let writes go through */
2037                                         res = chan->generator->generate(chan, tmp, f->datalen, f->samples);
2038                                         chan->generatordata = tmp;
2039                                         if (res) {
2040                                                 if (option_debug > 1)
2041                                                         ast_log(LOG_DEBUG, "Auto-deactivating generator\n");
2042                                                 ast_deactivate_generator(chan);
2043                                         }
2044
2045                                 } else if (f->frametype == AST_FRAME_CNG) {
2046                                         if (chan->generator && !chan->timingfunc && (chan->timingfd > -1)) {
2047                                                 if (option_debug > 1)
2048                                                         ast_log(LOG_DEBUG, "Generator got CNG, switching to timed mode\n");
2049                                                 ast_settimeout(chan, 160, generator_force, chan);
2050                                         }
2051                                 }
2052                         }
2053                 }
2054         } else {
2055                 /* Make sure we always return NULL in the future */
2056                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
2057                 if (chan->generator)
2058                         ast_deactivate_generator(chan);
2059                 /* End the CDR if appropriate */
2060                 if (chan->cdr)
2061                         ast_cdr_end(chan->cdr);
2062         }
2063
2064         /* High bit prints debugging */
2065         if (chan->fin & DEBUGCHAN_FLAG)
2066                 ast_frame_dump(chan->name, f, "<<");
2067         chan->fin = FRAMECOUNT_INC(chan->fin);
2068
2069 done:
2070         ast_channel_unlock(chan);
2071         return f;
2072 }
2073
2074 int ast_internal_timing_enabled(struct ast_channel *chan)
2075 {
2076         int ret = ast_opt_internal_timing && chan->timingfd > -1;
2077         if (option_debug > 3)
2078                 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);
2079         return ret;
2080 }
2081
2082 struct ast_frame *ast_read(struct ast_channel *chan)
2083 {
2084         return __ast_read(chan, 0);
2085 }
2086
2087 struct ast_frame *ast_read_noaudio(struct ast_channel *chan)
2088 {
2089         return __ast_read(chan, 1);
2090 }
2091
2092 int ast_indicate(struct ast_channel *chan, int condition)
2093 {
2094         int res = -1;
2095
2096         ast_channel_lock(chan);
2097         /* Stop if we're a zombie or need a soft hangup */
2098         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
2099                 ast_channel_unlock(chan);
2100                 return -1;
2101         }
2102         if (chan->tech->indicate)
2103                 res = chan->tech->indicate(chan, condition);
2104         ast_channel_unlock(chan);
2105         if (!chan->tech->indicate || res) {
2106                 /*
2107                  * Device does not support (that) indication, lets fake
2108                  * it by doing our own tone generation. (PM2002)
2109                  */
2110                 if (condition < 0)
2111                         ast_playtones_stop(chan);
2112                 else {
2113                         const struct tone_zone_sound *ts = NULL;
2114                         switch (condition) {
2115                         case AST_CONTROL_RINGING:
2116                                 ts = ast_get_indication_tone(chan->zone, "ring");
2117                                 break;
2118                         case AST_CONTROL_BUSY:
2119                                 ts = ast_get_indication_tone(chan->zone, "busy");
2120                                 break;
2121                         case AST_CONTROL_CONGESTION:
2122                                 ts = ast_get_indication_tone(chan->zone, "congestion");
2123                                 break;
2124                         }
2125                         if (ts && ts->data[0]) {
2126                                 ast_log(LOG_DEBUG, "Driver for channel '%s' does not support indication %d, emulating it\n", chan->name, condition);
2127                                 ast_playtones_start(chan,0,ts->data, 1);
2128                                 res = 0;
2129                         } else if (condition == AST_CONTROL_PROGRESS) {
2130                                 /* ast_playtones_stop(chan); */
2131                         } else if (condition == AST_CONTROL_PROCEEDING) {
2132                                 /* Do nothing, really */
2133                         } else if (condition == AST_CONTROL_HOLD) {
2134                                 /* Do nothing.... */
2135                         } else if (condition == AST_CONTROL_UNHOLD) {
2136                                 /* Do nothing.... */
2137                         } else if (condition == AST_CONTROL_VIDUPDATE) {
2138                                 /* Do nothing.... */
2139                         } else {
2140                                 /* not handled */
2141                                 ast_log(LOG_WARNING, "Unable to handle indication %d for '%s'\n", condition, chan->name);
2142                                 res = -1;
2143                         }
2144                 }
2145         }
2146         return res;
2147 }
2148
2149 int ast_recvchar(struct ast_channel *chan, int timeout)
2150 {
2151         int c;
2152         char *buf = ast_recvtext(chan, timeout);
2153         if (buf == NULL)
2154                 return -1;      /* error or timeout */
2155         c = *(unsigned char *)buf;
2156         free(buf);
2157         return c;
2158 }
2159
2160 char *ast_recvtext(struct ast_channel *chan, int timeout)
2161 {
2162         int res, done = 0;
2163         char *buf = NULL;
2164         
2165         while (!done) {
2166                 struct ast_frame *f;
2167                 if (ast_check_hangup(chan))
2168                         break;
2169                 res = ast_waitfor(chan, timeout);
2170                 if (res <= 0) /* timeout or error */
2171                         break;
2172                 timeout = res;  /* update timeout */
2173                 f = ast_read(chan);
2174                 if (f == NULL)
2175                         break; /* no frame */
2176                 if (f->frametype == AST_FRAME_CONTROL && f->subclass == AST_CONTROL_HANGUP)
2177                         done = 1;       /* force a break */
2178                 else if (f->frametype == AST_FRAME_TEXT) {              /* what we want */
2179                         buf = ast_strndup((char *) f->data, f->datalen);        /* dup and break */
2180                         done = 1;
2181                 }
2182                 ast_frfree(f);
2183         }
2184         return buf;
2185 }
2186
2187 int ast_sendtext(struct ast_channel *chan, const char *text)
2188 {
2189         int res = 0;
2190         /* Stop if we're a zombie or need a soft hangup */
2191         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))
2192                 return -1;
2193         CHECK_BLOCKING(chan);
2194         if (chan->tech->send_text)
2195                 res = chan->tech->send_text(chan, text);
2196         ast_clear_flag(chan, AST_FLAG_BLOCKING);
2197         return res;
2198 }
2199
2200 static int do_senddigit(struct ast_channel *chan, char digit)
2201 {
2202         int res = -1;
2203
2204         if (chan->tech->send_digit)
2205                 res = chan->tech->send_digit(chan, digit);
2206         if (res) {
2207                 /*
2208                  * Device does not support DTMF tones, lets fake
2209                  * it by doing our own generation. (PM2002)
2210                  */
2211                 static const char* dtmf_tones[] = {
2212                         "!941+1336/100,!0/100", /* 0 */
2213                         "!697+1209/100,!0/100", /* 1 */
2214                         "!697+1336/100,!0/100", /* 2 */
2215                         "!697+1477/100,!0/100", /* 3 */
2216                         "!770+1209/100,!0/100", /* 4 */
2217                         "!770+1336/100,!0/100", /* 5 */
2218                         "!770+1477/100,!0/100", /* 6 */
2219                         "!852+1209/100,!0/100", /* 7 */
2220                         "!852+1336/100,!0/100", /* 8 */
2221                         "!852+1477/100,!0/100", /* 9 */
2222                         "!697+1633/100,!0/100", /* A */
2223                         "!770+1633/100,!0/100", /* B */
2224                         "!852+1633/100,!0/100", /* C */
2225                         "!941+1633/100,!0/100", /* D */
2226                         "!941+1209/100,!0/100", /* * */
2227                         "!941+1477/100,!0/100" };       /* # */
2228                 if (digit >= '0' && digit <='9')
2229                         ast_playtones_start(chan, 0, dtmf_tones[digit-'0'], 0);
2230                 else if (digit >= 'A' && digit <= 'D')
2231                         ast_playtones_start(chan, 0, dtmf_tones[digit-'A'+10], 0);
2232                 else if (digit == '*')
2233                         ast_playtones_start(chan, 0, dtmf_tones[14], 0);
2234                 else if (digit == '#')
2235                         ast_playtones_start(chan, 0, dtmf_tones[15], 0);
2236                 else {
2237                         /* not handled */
2238                         ast_log(LOG_DEBUG, "Unable to generate DTMF tone '%c' for '%s'\n", digit, chan->name);
2239                 }
2240         }
2241         return 0;
2242 }
2243
2244 int ast_senddigit(struct ast_channel *chan, char digit)
2245 {
2246         return do_senddigit(chan, digit);
2247 }
2248
2249 int ast_prod(struct ast_channel *chan)
2250 {
2251         struct ast_frame a = { AST_FRAME_VOICE };
2252         char nothing[128];
2253
2254         /* Send an empty audio frame to get things moving */
2255         if (chan->_state != AST_STATE_UP) {
2256                 ast_log(LOG_DEBUG, "Prodding channel '%s'\n", chan->name);
2257                 a.subclass = chan->rawwriteformat;
2258                 a.data = nothing + AST_FRIENDLY_OFFSET;
2259                 a.src = "ast_prod";
2260                 if (ast_write(chan, &a))
2261                         ast_log(LOG_WARNING, "Prodding channel '%s' failed\n", chan->name);
2262         }
2263         return 0;
2264 }
2265
2266 int ast_write_video(struct ast_channel *chan, struct ast_frame *fr)
2267 {
2268         int res;
2269         if (!chan->tech->write_video)
2270                 return 0;
2271         res = ast_write(chan, fr);
2272         if (!res)
2273                 res = 1;
2274         return res;
2275 }
2276
2277 int ast_write(struct ast_channel *chan, struct ast_frame *fr)
2278 {
2279         int res = -1;
2280         struct ast_frame *f = NULL;
2281
2282         /* Stop if we're a zombie or need a soft hangup */
2283         ast_channel_lock(chan);
2284         if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))
2285                 goto done;
2286
2287         /* Handle any pending masquerades */
2288         if (chan->masq && ast_do_masquerade(chan)) {
2289                 ast_log(LOG_WARNING, "Failed to perform masquerade\n");
2290                 goto done;
2291         }
2292         if (chan->masqr) {
2293                 res = 0;        /* XXX explain, why 0 ? */
2294                 goto done;
2295         }
2296         if (chan->generatordata) {
2297                 if (ast_test_flag(chan, AST_FLAG_WRITE_INT))
2298                         ast_deactivate_generator(chan);
2299                 else {
2300                         res = 0;        /* XXX explain, why 0 ? */
2301                         goto done;
2302                 }
2303         }
2304         /* High bit prints debugging */
2305         if (chan->fout & DEBUGCHAN_FLAG)
2306                 ast_frame_dump(chan->name, fr, ">>");
2307         CHECK_BLOCKING(chan);
2308         switch(fr->frametype) {
2309         case AST_FRAME_CONTROL:
2310                 /* XXX Interpret control frames XXX */
2311                 ast_log(LOG_WARNING, "Don't know how to handle control frames yet\n");
2312                 break;
2313         case AST_FRAME_DTMF_BEGIN:
2314                 res = (chan->tech->send_digit_begin == NULL) ? 0 :
2315                         chan->tech->send_digit_begin(chan, fr->subclass);
2316                 break;
2317         case AST_FRAME_DTMF_END:
2318                 res = (chan->tech->send_digit_end == NULL) ? 0 :
2319                         chan->tech->send_digit_end(chan);
2320                 break;
2321         case AST_FRAME_DTMF:
2322                 ast_clear_flag(chan, AST_FLAG_BLOCKING);
2323                 ast_channel_unlock(chan);
2324                 res = do_senddigit(chan,fr->subclass);
2325                 ast_channel_lock(chan);
2326                 CHECK_BLOCKING(chan);
2327                 break;
2328         case AST_FRAME_TEXT:
2329                 res = (chan->tech->send_text == NULL) ? 0 :
2330                         chan->tech->send_text(chan, (char *) fr->data);
2331                 break;
2332         case AST_FRAME_HTML:
2333                 res = (chan->tech->send_html == NULL) ? 0 :
2334                         chan->tech->send_html(chan, fr->subclass, (char *) fr->data, fr->datalen);
2335                 break;
2336         case AST_FRAME_VIDEO:
2337                 /* XXX Handle translation of video codecs one day XXX */
2338                 res = (chan->tech->write_video == NULL) ? 0 :
2339                         chan->tech->write_video(chan, fr);
2340                 break;
2341         case AST_FRAME_VOICE:
2342                 if (chan->tech->write == NULL)
2343                         break;  /*! \todo XXX should return 0 maybe ? */
2344
2345                 /* Bypass translator if we're writing format in the raw write format.  This
2346                    allows mixing of native / non-native formats */
2347                 if (fr->subclass == chan->rawwriteformat)
2348                         f = fr;
2349                 else
2350                         f = (chan->writetrans) ? ast_translate(chan->writetrans, fr, 0) : fr;
2351                 if (f == NULL) {
2352                         res = 0;
2353                 } else {
2354                         if (chan->spies)
2355                                 queue_frame_to_spies(chan, f, SPY_WRITE);
2356
2357                         if (chan->monitor && chan->monitor->write_stream) {
2358                                 /* XXX must explain this code */
2359 #ifndef MONITOR_CONSTANT_DELAY
2360                                 int jump = chan->insmpl - chan->outsmpl - 4 * f->samples;
2361                                 if (jump >= 0) {
2362                                         if (ast_seekstream(chan->monitor->write_stream, jump + f->samples, SEEK_FORCECUR) == -1)
2363                                                 ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
2364                                         chan->outsmpl += jump + 4 * f->samples;
2365                                 } else
2366                                         chan->outsmpl += f->samples;
2367 #else
2368                                 int jump = chan->insmpl - chan->outsmpl;
2369                                 if (jump - MONITOR_DELAY >= 0) {
2370                                         if (ast_seekstream(chan->monitor->write_stream, jump - f->samples, SEEK_FORCECUR) == -1)
2371                                                 ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
2372                                         chan->outsmpl += jump;
2373                                 } else
2374                                         chan->outsmpl += f->samples;
2375 #endif
2376                                 if (chan->monitor->state == AST_MONITOR_RUNNING) {
2377                                         if (ast_writestream(chan->monitor->write_stream, f) < 0)
2378                                                 ast_log(LOG_WARNING, "Failed to write data to channel monitor write stream\n");
2379                                 }
2380                         }
2381
2382                         res = chan->tech->write(chan, f);
2383                 }
2384                 break;  
2385         }
2386
2387         if (f && f != fr)
2388                 ast_frfree(f);
2389         ast_clear_flag(chan, AST_FLAG_BLOCKING);
2390         /* Consider a write failure to force a soft hangup */
2391         if (res < 0)
2392                 chan->_softhangup |= AST_SOFTHANGUP_DEV;
2393         else {
2394                 chan->fout = FRAMECOUNT_INC(chan->fout);
2395         }
2396 done:
2397         ast_channel_unlock(chan);
2398         return res;
2399 }
2400
2401 static int set_format(struct ast_channel *chan, int fmt, int *rawformat, int *format,
2402                       struct ast_trans_pvt **trans, const int direction)
2403 {
2404         int native;
2405         int res;
2406         
2407         /* Make sure we only consider audio */
2408         fmt &= AST_FORMAT_AUDIO_MASK;
2409         
2410         native = chan->nativeformats;
2411         /* Find a translation path from the native format to one of the desired formats */
2412         if (!direction)
2413                 /* reading */
2414                 res = ast_translator_best_choice(&fmt, &native);
2415         else
2416                 /* writing */
2417                 res = ast_translator_best_choice(&native, &fmt);
2418
2419         if (res < 0) {
2420                 ast_log(LOG_WARNING, "Unable to find a codec translation path from %s to %s\n",
2421                         ast_getformatname(native), ast_getformatname(fmt));
2422                 return -1;
2423         }
2424         
2425         /* Now we have a good choice for both. */
2426         ast_channel_lock(chan);
2427         *rawformat = native;
2428         /* User perspective is fmt */
2429         *format = fmt;
2430         /* Free any read translation we have right now */
2431         if (*trans)
2432                 ast_translator_free_path(*trans);
2433         /* Build a translation path from the raw format to the desired format */
2434         if (!direction)
2435                 /* reading */
2436                 *trans = ast_translator_build_path(*format, *rawformat);
2437         else
2438                 /* writing */
2439                 *trans = ast_translator_build_path(*rawformat, *format);
2440         ast_channel_unlock(chan);
2441         if (option_debug)
2442                 ast_log(LOG_DEBUG, "Set channel %s to %s format %s\n", chan->name,
2443                         direction ? "write" : "read", ast_getformatname(fmt));
2444         return 0;
2445 }
2446
2447 int ast_set_read_format(struct ast_channel *chan, int fmt)
2448 {
2449         return set_format(chan, fmt, &chan->rawreadformat, &chan->readformat,
2450                           &chan->readtrans, 0);
2451 }
2452
2453 int ast_set_write_format(struct ast_channel *chan, int fmt)
2454 {
2455         return set_format(chan, fmt, &chan->rawwriteformat, &chan->writeformat,
2456                           &chan->writetrans, 1);
2457 }
2458
2459 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)
2460 {
2461         int dummy_outstate;
2462         int cause = 0;
2463         struct ast_channel *chan;
2464         int res = 0;
2465         
2466         if (outstate)
2467                 *outstate = 0;
2468         else
2469                 outstate = &dummy_outstate;     /* make outstate always a valid pointer */
2470
2471         chan = ast_request(type, format, data, &cause);
2472         if (!chan) {
2473                 ast_log(LOG_NOTICE, "Unable to request channel %s/%s\n", type, (char *)data);
2474                 /* compute error and return */
2475                 if (cause == AST_CAUSE_BUSY)
2476                         *outstate = AST_CONTROL_BUSY;
2477                 else if (cause == AST_CAUSE_CONGESTION)
2478                         *outstate = AST_CONTROL_CONGESTION;
2479                 return NULL;
2480         }
2481
2482         if (oh) {
2483                 if (oh->vars)   
2484                         ast_set_variables(chan, oh->vars);
2485                 /* XXX why is this necessary, for the parent_channel perhaps ? */
2486                 if (!ast_strlen_zero(oh->cid_num) && !ast_strlen_zero(oh->cid_name))
2487                         ast_set_callerid(chan, oh->cid_num, oh->cid_name, oh->cid_num);
2488                 if (oh->parent_channel)
2489                         ast_channel_inherit_variables(oh->parent_channel, chan);
2490                 if (oh->account)
2491                         ast_cdr_setaccount(chan, oh->account);  
2492         }
2493         ast_set_callerid(chan, cid_num, cid_name, cid_num);
2494
2495         if (ast_call(chan, data, 0)) {  /* ast_call failed... */
2496                 ast_log(LOG_NOTICE, "Unable to call channel %s/%s\n", type, (char *)data);
2497         } else {
2498                 res = 1;        /* mark success in case chan->_state is already AST_STATE_UP */
2499                 while (timeout && chan->_state != AST_STATE_UP) {
2500                         struct ast_frame *f;
2501                         res = ast_waitfor(chan, timeout);
2502                         if (res <= 0) /* error, timeout, or done */
2503                                 break;
2504                         if (timeout > -1)
2505                                 timeout = res;
2506                         f = ast_read(chan);
2507                         if (!f) {
2508                                 *outstate = AST_CONTROL_HANGUP;
2509                                 res = 0;
2510                                 break;
2511                         }
2512                         if (f->frametype == AST_FRAME_CONTROL) {
2513                                 switch (f->subclass) {
2514                                 case AST_CONTROL_RINGING:       /* record but keep going */
2515                                         *outstate = f->subclass;
2516                                         break;
2517
2518                                 case AST_CONTROL_BUSY:
2519                                 case AST_CONTROL_CONGESTION:
2520                                 case AST_CONTROL_ANSWER:
2521                                         *outstate = f->subclass;
2522                                         timeout = 0;            /* trick to force exit from the while() */
2523                                         break;
2524
2525                                 case AST_CONTROL_PROGRESS:      /* Ignore */
2526                                 case -1:                        /* Ignore -- just stopping indications */
2527                                         break;
2528
2529                                 default:
2530                                         ast_log(LOG_NOTICE, "Don't know what to do with control frame %d\n", f->subclass);
2531                                 }
2532                         }
2533                         ast_frfree(f);
2534                 }
2535         }
2536
2537         /* Final fixups */
2538         if (oh) {
2539                 if (!ast_strlen_zero(oh->context))
2540                         ast_copy_string(chan->context, oh->context, sizeof(chan->context));
2541                 if (!ast_strlen_zero(oh->exten))
2542                         ast_copy_string(chan->exten, oh->exten, sizeof(chan->exten));
2543                 if (oh->priority)       
2544                         chan->priority = oh->priority;
2545         }
2546         if (chan->_state == AST_STATE_UP)
2547                 *outstate = AST_CONTROL_ANSWER;
2548
2549         if (res <= 0) {
2550                 if (!chan->cdr && (chan->cdr = ast_cdr_alloc()))
2551                         ast_cdr_init(chan->cdr, chan);
2552                 if (chan->cdr) {
2553                         char tmp[256];
2554                         snprintf(tmp, sizeof(tmp), "%s/%s", type, (char *)data);
2555                         ast_cdr_setapp(chan->cdr,"Dial",tmp);
2556                         ast_cdr_update(chan);
2557                         ast_cdr_start(chan->cdr);
2558                         ast_cdr_end(chan->cdr);
2559                         /* If the cause wasn't handled properly */
2560                         if (ast_cdr_disposition(chan->cdr,chan->hangupcause))
2561                                 ast_cdr_failed(chan->cdr);
2562                 }
2563                 ast_hangup(chan);
2564                 chan = NULL;
2565         }
2566         return chan;
2567 }
2568
2569 struct ast_channel *ast_request_and_dial(const char *type, int format, void *data, int timeout, int *outstate, const char *cidnum, const char *cidname)
2570 {
2571         return __ast_request_and_dial(type, format, data, timeout, outstate, cidnum, cidname, NULL);
2572 }
2573
2574 struct ast_channel *ast_request(const char *type, int format, void *data, int *cause)
2575 {
2576         struct chanlist *chan;
2577         struct ast_channel *c;
2578         int capabilities;
2579         int fmt;
2580         int res;
2581         int foo;
2582
2583         if (!cause)
2584                 cause = &foo;
2585         *cause = AST_CAUSE_NOTDEFINED;
2586
2587         if (AST_LIST_LOCK(&channels)) {
2588                 ast_log(LOG_WARNING, "Unable to lock channel list\n");
2589                 return NULL;
2590         }
2591
2592         AST_LIST_TRAVERSE(&backends, chan, list) {
2593                 if (strcasecmp(type, chan->tech->type))
2594                         continue;
2595
2596                 capabilities = chan->tech->capabilities;
2597                 fmt = format;
2598                 res = ast_translator_best_choice(&fmt, &capabilities);
2599                 if (res < 0) {
2600                         ast_log(LOG_WARNING, "No translator path exists for channel type %s (native %d) to %d\n", type, chan->tech->capabilities, format);
2601                         AST_LIST_UNLOCK(&channels);
2602                         return NULL;
2603                 }
2604                 AST_LIST_UNLOCK(&channels);
2605                 if (!chan->tech->requester)
2606                         return NULL;
2607                 
2608                 if (!(c = chan->tech->requester(type, capabilities, data, cause)))
2609                         return NULL;
2610
2611                 if (c->_state == AST_STATE_DOWN) {
2612                         manager_event(EVENT_FLAG_CALL, "Newchannel",
2613                                       "Channel: %s\r\n"
2614                                       "State: %s\r\n"
2615                                       "CallerID: %s\r\n"
2616                                       "CallerIDName: %s\r\n"
2617                                       "Uniqueid: %s\r\n",
2618                                       c->name, ast_state2str(c->_state),
2619                                       S_OR(c->cid.cid_num, "<unknown>"),
2620                                       S_OR(c->cid.cid_name, "<unknown>"),
2621                                       c->uniqueid);
2622                 }
2623                 return c;
2624         }
2625
2626         ast_log(LOG_WARNING, "No channel type registered for '%s'\n", type);
2627         *cause = AST_CAUSE_NOSUCHDRIVER;
2628         AST_LIST_UNLOCK(&channels);
2629
2630         return NULL;
2631 }
2632
2633 int ast_call(struct ast_channel *chan, char *addr, int timeout)
2634 {
2635         /* Place an outgoing call, but don't wait any longer than timeout ms before returning.
2636            If the remote end does not answer within the timeout, then do NOT hang up, but
2637            return anyway.  */
2638         int res = -1;
2639         /* Stop if we're a zombie or need a soft hangup */
2640         ast_channel_lock(chan);
2641         if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan))
2642                 if (chan->tech->call)
2643                         res = chan->tech->call(chan, addr, timeout);
2644         ast_channel_unlock(chan);
2645         return res;
2646 }
2647
2648 /*!
2649   \brief Transfer a call to dest, if the channel supports transfer
2650
2651   Called by:
2652     \arg app_transfer
2653     \arg the manager interface
2654 */
2655 int ast_transfer(struct ast_channel *chan, char *dest)
2656 {
2657         int res = -1;
2658
2659         /* Stop if we're a zombie or need a soft hangup */
2660         ast_channel_lock(chan);
2661         if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan)) {
2662                 if (chan->tech->transfer) {
2663                         res = chan->tech->transfer(chan, dest);
2664                         if (!res)
2665                                 res = 1;
2666                 } else
2667                         res = 0;
2668         }
2669         ast_channel_unlock(chan);
2670         return res;
2671 }
2672
2673 int ast_readstring(struct ast_channel *c, char *s, int len, int timeout, int ftimeout, char *enders)
2674 {
2675         return ast_readstring_full(c, s, len, timeout, ftimeout, enders, -1, -1);
2676 }
2677
2678 int ast_readstring_full(struct ast_channel *c, char *s, int len, int timeout, int ftimeout, char *enders, int audiofd, int ctrlfd)
2679 {
2680         int pos = 0;    /* index in the buffer where we accumulate digits */
2681         int to = ftimeout;
2682
2683         /* Stop if we're a zombie or need a soft hangup */
2684         if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
2685                 return -1;
2686         if (!len)
2687                 return -1;
2688         for (;;) {
2689                 int d;
2690                 if (c->stream) {
2691                         d = ast_waitstream_full(c, AST_DIGIT_ANY, audiofd, ctrlfd);
2692                         ast_stopstream(c);
2693                         usleep(1000);
2694                         if (!d)
2695                                 d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
2696                 } else {
2697                         d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
2698                 }
2699                 if (d < 0)
2700                         return -1;
2701                 if (d == 0) {
2702                         s[pos]='\0';
2703                         return 1;
2704                 }
2705                 if (d == 1) {
2706                         s[pos]='\0';
2707                         return 2;
2708                 }
2709                 if (!strchr(enders, d))
2710                         s[pos++] = d;
2711                 if (strchr(enders, d) || (pos >= len)) {
2712                         s[pos]='\0';
2713                         return 0;
2714                 }
2715                 to = timeout;
2716         }
2717         /* Never reached */
2718         return 0;
2719 }
2720
2721 int ast_channel_supports_html(struct ast_channel *chan)
2722 {
2723         return (chan->tech->send_html) ? 1 : 0;
2724 }
2725
2726 int ast_channel_sendhtml(struct ast_channel *chan, int subclass, const char *data, int datalen)
2727 {
2728         if (chan->tech->send_html)
2729                 return chan->tech->send_html(chan, subclass, data, datalen);
2730         return -1;
2731 }
2732
2733 int ast_channel_sendurl(struct ast_channel *chan, const char *url)
2734 {
2735         return ast_channel_sendhtml(chan, AST_HTML_URL, url, strlen(url) + 1);
2736 }
2737
2738 int ast_channel_make_compatible(struct ast_channel *chan, struct ast_channel *peer)
2739 {
2740         int src;
2741         int dst;
2742
2743         /* Set up translation from the chan to the peer */
2744         src = chan->nativeformats;
2745         dst = peer->nativeformats;
2746         if (ast_translator_best_choice(&dst, &src) < 0) {
2747                 ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", chan->name, src, peer->name, dst);
2748                 return -1;
2749         }
2750
2751         /* if the best path is not 'pass through', then
2752            transcoding is needed; if desired, force transcode path
2753            to use SLINEAR between channels, but only if there is
2754            no direct conversion available */
2755         if ((src != dst) && ast_opt_transcode_via_slin &&
2756             (ast_translate_path_steps(dst, src) != 1))
2757                 dst = AST_FORMAT_SLINEAR;
2758         if (ast_set_read_format(chan, dst) < 0) {
2759                 ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", chan->name, dst);
2760                 return -1;
2761         }
2762         if (ast_set_write_format(peer, dst) < 0) {
2763                 ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", peer->name, dst);
2764                 return -1;
2765         }
2766
2767         /* Set up translation from the peer to the chan */
2768         src = peer->nativeformats;
2769         dst = chan->nativeformats;
2770         if (ast_translator_best_choice(&dst, &src) < 0) {
2771                 ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", peer->name, src, chan->name, dst);
2772                 return -1;
2773         }
2774
2775         /* if the best path is not 'pass through', then
2776            transcoding is needed; if desired, force transcode path
2777            to use SLINEAR between channels, but only if there is
2778            no direct conversion available */
2779         if ((src != dst) && ast_opt_transcode_via_slin &&
2780             (ast_translate_path_steps(dst, src) != 1))
2781                 dst = AST_FORMAT_SLINEAR;
2782         if (ast_set_read_format(peer, dst) < 0) {
2783                 ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", peer->name, dst);
2784                 return -1;
2785         }
2786         if (ast_set_write_format(chan, dst) < 0) {
2787                 ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", chan->name, dst);
2788                 return -1;
2789         }
2790         return 0;
2791 }
2792
2793 int ast_channel_masquerade(struct ast_channel *original, struct ast_channel *clone)
2794 {
2795         int res = -1;
2796
2797         if (original == clone) {
2798                 ast_log(LOG_WARNING, "Can't masquerade channel '%s' into itself!\n", original->name);
2799                 return -1;
2800         }
2801         ast_channel_lock(original);
2802         while(ast_channel_trylock(clone)) {
2803                 ast_channel_unlock(original);
2804                 usleep(1);
2805                 ast_channel_lock(original);
2806         }
2807         ast_log(LOG_DEBUG, "Planning to masquerade channel %s into the structure of %s\n",
2808                 clone->name, original->name);
2809         if (original->masq) {
2810                 ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
2811                         original->masq->name, original->name);
2812         } else if (clone->masqr) {
2813                 ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
2814                         clone->name, clone->masqr->name);
2815         } else {
2816                 original->masq = clone;
2817                 clone->masqr = original;
2818                 ast_queue_frame(original, &ast_null_frame);
2819                 ast_queue_frame(clone, &ast_null_frame);
2820                 ast_log(LOG_DEBUG, "Done planning to masquerade channel %s into the structure of %s\n", clone->name, original->name);
2821                 res = 0;
2822         }
2823         ast_channel_unlock(clone);
2824         ast_channel_unlock(original);
2825         return res;
2826 }
2827
2828 void ast_change_name(struct ast_channel *chan, char *newname)
2829 {
2830         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", chan->name, newname, chan->uniqueid);
2831         ast_string_field_set(chan, name, newname);
2832 }
2833
2834 void ast_channel_inherit_variables(const struct ast_channel *parent, struct ast_channel *child)
2835 {
2836         struct ast_var_t *current, *newvar;
2837         const char *varname;
2838
2839         AST_LIST_TRAVERSE(&parent->varshead, current, entries) {
2840                 int vartype = 0;
2841
2842                 varname = ast_var_full_name(current);
2843                 if (!varname)
2844                         continue;
2845
2846                 if (varname[0] == '_') {
2847                         vartype = 1;
2848                         if (varname[1] == '_')
2849                                 vartype = 2;
2850                 }
2851
2852                 switch (vartype) {
2853                 case 1:
2854                         newvar = ast_var_assign(&varname[1], ast_var_value(current));
2855                         if (newvar) {
2856                                 AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
2857                                 if (option_debug)
2858                                         ast_log(LOG_DEBUG, "Copying soft-transferable variable %s.\n", ast_var_name(newvar));
2859                         }
2860                         break;
2861                 case 2:
2862                         newvar = ast_var_assign(ast_var_full_name(current), ast_var_value(current));
2863                         if (newvar) {
2864                                 AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
2865                                 if (option_debug)
2866                                         ast_log(LOG_DEBUG, "Copying hard-transferable variable %s.\n", ast_var_name(newvar));
2867                         }
2868                         break;
2869                 default:
2870                         if (option_debug)
2871                                 ast_log(LOG_DEBUG, "Not copying variable %s.\n", ast_var_name(current));
2872                         break;
2873                 }
2874         }
2875 }
2876
2877 /*!
2878   \brief Clone channel variables from 'clone' channel into 'original' channel
2879
2880   All variables except those related to app_groupcount are cloned.
2881   Variables are actually _removed_ from 'clone' channel, presumably
2882   because it will subsequently be destroyed.
2883
2884   \note Assumes locks will be in place on both channels when called.
2885 */
2886 static void clone_variables(struct ast_channel *original, struct ast_channel *clone)
2887 {
2888         struct ast_var_t *varptr;
2889
2890         /* we need to remove all app_groupcount related variables from the original
2891            channel before merging in the clone's variables; any groups assigned to the
2892            original channel should be released, only those assigned to the clone
2893            should remain
2894         */
2895
2896         AST_LIST_TRAVERSE_SAFE_BEGIN(&original->varshead, varptr, entries) {
2897                 if (!strncmp(ast_var_name(varptr), GROUP_CATEGORY_PREFIX, strlen(GROUP_CATEGORY_PREFIX))) {
2898                         AST_LIST_REMOVE(&original->varshead, varptr, entries);
2899                         ast_var_delete(varptr);
2900                 }
2901         }
2902         AST_LIST_TRAVERSE_SAFE_END;
2903
2904         /* Append variables from clone channel into original channel */
2905         /* XXX Is this always correct?  We have to in order to keep MACROS working XXX */
2906         if (AST_LIST_FIRST(&clone->varshead))
2907                 AST_LIST_INSERT_TAIL(&original->varshead, AST_LIST_FIRST(&clone->varshead), entries);
2908 }
2909
2910 /*!
2911   \brief Masquerade a channel
2912
2913   \note Assumes channel will be locked when called
2914 */
2915 int ast_do_masquerade(struct ast_channel *original)
2916 {
2917         int x,i;
2918         int res=0;
2919         int origstate;
2920         struct ast_frame *cur, *prev;
2921         const struct ast_channel_tech *t;
2922         void *t_pvt;
2923         struct ast_callerid tmpcid;
2924         struct ast_channel *clone = original->masq;
2925         int rformat = original->readformat;
2926         int wformat = original->writeformat;
2927         char newn[100];
2928         char orig[100];
2929         char masqn[100];
2930         char zombn[100];
2931
2932         if (option_debug > 3)
2933                 ast_log(LOG_DEBUG, "Actually Masquerading %s(%d) into the structure of %s(%d)\n",
2934                         clone->name, clone->_state, original->name, original->_state);
2935
2936         /* XXX This is a seriously wacked out operation.  We're essentially putting the guts of
2937            the clone channel into the original channel.  Start by killing off the original
2938            channel's backend.   I'm not sure we're going to keep this function, because
2939            while the features are nice, the cost is very high in terms of pure nastiness. XXX */
2940
2941         /* We need the clone's lock, too */
2942         ast_channel_lock(clone);
2943
2944         if (option_debug > 1)
2945                 ast_log(LOG_DEBUG, "Got clone lock for masquerade on '%s' at %p\n", clone->name, &clone->lock);
2946
2947         /* Having remembered the original read/write formats, we turn off any translation on either
2948            one */
2949         free_translation(clone);
2950         free_translation(original);
2951
2952
2953         /* Unlink the masquerade */
2954         original->masq = NULL;
2955         clone->masqr = NULL;
2956         
2957         /* Save the original name */
2958         ast_copy_string(orig, original->name, sizeof(orig));
2959         /* Save the new name */
2960         ast_copy_string(newn, clone->name, sizeof(newn));
2961         /* Create the masq name */
2962         snprintf(masqn, sizeof(masqn), "%s<MASQ>", newn);
2963                 
2964         /* Copy the name from the clone channel */
2965         ast_string_field_set(original, name, newn);
2966
2967         /* Mangle the name of the clone channel */
2968         ast_string_field_set(clone, name, masqn);
2969         
2970         /* Notify any managers of the change, first the masq then the other */
2971         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", newn, masqn, clone->uniqueid);
2972         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", orig, newn, original->uniqueid);
2973
2974         /* Swap the technologies */     
2975         t = original->tech;
2976         original->tech = clone->tech;
2977         clone->tech = t;
2978
2979         t_pvt = original->tech_pvt;
2980         original->tech_pvt = clone->tech_pvt;
2981         clone->tech_pvt = t_pvt;
2982
2983         /* Swap the readq's */
2984         cur = original->readq;
2985         original->readq = clone->readq;
2986         clone->readq = cur;
2987
2988         /* Swap the alertpipes */
2989         for (i = 0; i < 2; i++) {
2990                 x = original->alertpipe[i];
2991                 original->alertpipe[i] = clone->alertpipe[i];
2992                 clone->alertpipe[i] = x;
2993         }
2994
2995         /* Swap the raw formats */
2996         x = original->rawreadformat;
2997         original->rawreadformat = clone->rawreadformat;
2998         clone->rawreadformat = x;
2999         x = original->rawwriteformat;
3000         original->rawwriteformat = clone->rawwriteformat;
3001         clone->rawwriteformat = x;
3002
3003         /* Save any pending frames on both sides.  Start by counting
3004          * how many we're going to need... */
3005         prev = NULL;
3006         x = 0;
3007         for (cur = clone->readq; cur; cur = cur->next) {
3008                 x++;
3009                 prev = cur;
3010         }
3011         /* If we had any, prepend them to the ones already in the queue, and
3012          * load up the alertpipe */
3013         if (prev) {
3014                 prev->next = original->readq;
3015                 original->readq = clone->readq;
3016                 clone->readq = NULL;
3017                 if (original->alertpipe[1] > -1) {
3018                         for (i = 0; i < x; i++)
3019                                 write(original->alertpipe[1], &x, sizeof(x));
3020                 }
3021         }
3022         clone->_softhangup = AST_SOFTHANGUP_DEV;
3023
3024
3025         /* And of course, so does our current state.  Note we need not
3026            call ast_setstate since the event manager doesn't really consider
3027            these separate.  We do this early so that the clone has the proper
3028            state of the original channel. */
3029         origstate = original->_state;
3030         original->_state = clone->_state;
3031         clone->_state = origstate;
3032
3033         if (clone->tech->fixup){
3034                 res = clone->tech->fixup(original, clone);
3035                 if (res)
3036                         ast_log(LOG_WARNING, "Fixup failed on channel %s, strange things may happen.\n", clone->name);
3037         }
3038
3039         /* Start by disconnecting the original's physical side */
3040         if (clone->tech->hangup)
3041                 res = clone->tech->hangup(clone);
3042         if (res) {
3043                 ast_log(LOG_WARNING, "Hangup failed!  Strange things may happen!\n");
3044                 ast_channel_unlock(clone);
3045                 return -1;
3046         }
3047         
3048         snprintf(zombn, sizeof(zombn), "%s<ZOMBIE>", orig);
3049         /* Mangle the name of the clone channel */
3050         ast_string_field_set(clone, name, zombn);
3051         manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", masqn, zombn, clone->uniqueid);
3052
3053         /* Update the type. */
3054         t_pvt = original->monitor;
3055         original->monitor = clone->monitor;
3056         clone->monitor = t_pvt;
3057         
3058         /* Keep the same language.  */
3059         ast_string_field_set(original, language, clone->language);
3060         /* Copy the FD's other than the generator fd */
3061         for (x = 0; x < AST_MAX_FDS; x++) {
3062                 if (x != AST_GENERATOR_FD)
3063                         original->fds[x] = clone->fds[x];
3064         }
3065         /* Move data stores over */
3066         if (AST_LIST_FIRST(&clone->datastores))
3067                 AST_LIST_INSERT_TAIL(&original->datastores, AST_LIST_FIRST(&clone->datastores), entry);
3068         AST_LIST_HEAD_INIT_NOLOCK(&clone->datastores);
3069
3070         clone_variables(original, clone);
3071         AST_LIST_HEAD_INIT_NOLOCK(&clone->varshead);
3072         /* Presense of ADSI capable CPE follows clone */
3073         original->adsicpe = clone->adsicpe;
3074         /* Bridge remains the same */
3075         /* CDR fields remain the same */
3076         /* XXX What about blocking, softhangup, blocker, and lock and blockproc? XXX */
3077         /* Application and data remain the same */
3078         /* Clone exception  becomes real one, as with fdno */
3079         ast_copy_flags(original, clone, AST_FLAG_EXCEPTION);
3080         original->fdno = clone->fdno;
3081         /* Schedule context remains the same */
3082         /* Stream stuff stays the same */
3083         /* Keep the original state.  The fixup code will need to work with it most likely */
3084
3085         /* Just swap the whole structures, nevermind the allocations, they'll work themselves
3086            out. */
3087         tmpcid = original->cid;
3088         original->cid = clone->cid;
3089         clone->cid = tmpcid;
3090         
3091         /* Restore original timing file descriptor */
3092         original->fds[AST_TIMING_FD] = original->timingfd;
3093         
3094         /* Our native formats are different now */
3095         original->nativeformats = clone->nativeformats;
3096         
3097         /* Context, extension, priority, app data, jump table,  remain the same */
3098         /* pvt switches.  pbx stays the same, as does next */
3099         
3100         /* Set the write format */
3101         ast_set_write_format(original, wformat);
3102
3103         /* Set the read format */
3104         ast_set_read_format(original, rformat);
3105
3106         /* Copy the music class */
3107         ast_string_field_set(original, musicclass, clone->musicclass);
3108
3109         if (option_debug)
3110                 ast_log(LOG_DEBUG, "Putting channel %s in %d/%d formats\n", original->name, wformat, rformat);
3111
3112         /* Okay.  Last thing is to let the channel driver know about all this mess, so he
3113            can fix up everything as best as possible */
3114         if (original->tech->fixup) {
3115                 res = original->tech->fixup(clone, original);
3116                 if (res) {
3117                         ast_log(LOG_WARNING, "Channel for type '%s' could not fixup channel %s\n",
3118                                 original->tech->type, original->name);
3119                         ast_channel_unlock(clone);
3120                         return -1;
3121                 }
3122         } else
3123                 ast_log(LOG_WARNING, "Channel type '%s' does not have a fixup routine (for %s)!  Bad things may happen.\n",
3124                         original->tech->type, original->name);
3125         
3126         /* Now, at this point, the "clone" channel is totally F'd up.  We mark it as
3127            a zombie so nothing tries to touch it.  If it's already been marked as a
3128            zombie, then free it now (since it already is considered invalid). */
3129         if (ast_test_flag(clone, AST_FLAG_ZOMBIE)) {
3130                 if (option_debug)
3131                         ast_log(LOG_DEBUG, "Destroying channel clone '%s'\n", clone->name);
3132                 ast_channel_unlock(clone);
3133                 manager_event(EVENT_FLAG_CALL, "Hangup",
3134                         "Channel: %s\r\n"
3135                         "Uniqueid: %s\r\n"
3136                         "Cause: %d\r\n"
3137                         "Cause-txt: %s\r\n",
3138                         clone->name,
3139                         clone->uniqueid,
3140                         clone->hangupcause,
3141                         ast_cause2str(clone->hangupcause)
3142                         );
3143                 ast_channel_free(clone);
3144         } else {
3145                 ast_log(LOG_DEBUG, "Released clone lock on '%s'\n", clone->name);
3146                 ast_set_flag(clone, AST_FLAG_ZOMBIE);
3147                 ast_queue_frame(clone, &ast_null_frame);
3148                 ast_channel_unlock(clone);
3149         }
3150         
3151         /* Signal any blocker */
3152         if (ast_test_flag(original, AST_FLAG_BLOCKING))
3153                 pthread_kill(original->blocker, SIGURG);
3154         if (option_debug)
3155                 ast_log(LOG_DEBUG, "Done Masquerading %s (%d)\n", original->name, original->_state);
3156         return 0;
3157 }
3158
3159 void ast_set_callerid(struct ast_channel *chan, const char *callerid, const char *calleridname, const char *ani)
3160 {
3161         if (callerid) {
3162                 if (chan->cid.cid_num)
3163                         free(chan->cid.cid_num);
3164                 chan->cid.cid_num = ast_strdup(callerid);
3165         }
3166         if (calleridname) {
3167             &nb