2 * Asterisk -- An open source telephony toolkit.
4 * Copyright (C) 1999 - 2008, Digium, Inc.
6 * Mark Spencer <markster@digium.com>
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.
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.
21 * \brief Core PBX routines.
23 * \author Mark Spencer <markster@digium.com>
28 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
30 #include "asterisk/_private.h"
31 #include "asterisk/paths.h" /* use ast_config_AST_SYSTEM_NAME */
35 #if defined(HAVE_SYSINFO)
36 #include <sys/sysinfo.h>
39 #include <sys/loadavg.h>
42 #include "asterisk/lock.h"
43 #include "asterisk/cli.h"
44 #include "asterisk/pbx.h"
45 #include "asterisk/channel.h"
46 #include "asterisk/file.h"
47 #include "asterisk/callerid.h"
48 #include "asterisk/cdr.h"
49 #include "asterisk/config.h"
50 #include "asterisk/term.h"
51 #include "asterisk/manager.h"
52 #include "asterisk/ast_expr.h"
53 #include "asterisk/linkedlists.h"
54 #define SAY_STUBS /* generate declarations and stubs for say methods */
55 #include "asterisk/say.h"
56 #include "asterisk/utils.h"
57 #include "asterisk/causes.h"
58 #include "asterisk/musiconhold.h"
59 #include "asterisk/app.h"
60 #include "asterisk/devicestate.h"
61 #include "asterisk/stringfields.h"
62 #include "asterisk/event.h"
63 #include "asterisk/hashtab.h"
64 #include "asterisk/module.h"
65 #include "asterisk/indications.h"
68 * \note I M P O R T A N T :
70 * The speed of extension handling will likely be among the most important
71 * aspects of this PBX. The switching scheme as it exists right now isn't
72 * terribly bad (it's O(N+M), where N is the # of extensions and M is the avg #
73 * of priorities, but a constant search time here would be great ;-)
75 * A new algorithm to do searching based on a 'compiled' pattern tree is introduced
76 * here, and shows a fairly flat (constant) search time, even for over
77 * 1000 patterns. Might Still needs some work-- there are some fine points of the matching
78 * spec about tie-breaking based on the characters in character sets, but this
79 * should be do-able via the weight system currently being used.
81 * Also, using a hash table for context/priority name lookup can help prevent
82 * the find_extension routines from absorbing exponential cpu cycles. I've tested
83 * find_extension with red-black trees, which have O(log2(n)) speed. Right now,
84 * I'm using hash tables, which do searches (ideally) in O(1) time.
89 #define EXT_DATA_SIZE 256
91 #define EXT_DATA_SIZE 8192
94 #define SWITCH_DATA_LENGTH 256
96 #define VAR_BUF_SIZE 4096
99 #define VAR_SOFTTRAN 2
100 #define VAR_HARDTRAN 3
102 #define BACKGROUND_SKIP (1 << 0)
103 #define BACKGROUND_NOANSWER (1 << 1)
104 #define BACKGROUND_MATCHEXTEN (1 << 2)
105 #define BACKGROUND_PLAYBACK (1 << 3)
107 AST_APP_OPTIONS(background_opts, {
108 AST_APP_OPTION('s', BACKGROUND_SKIP),
109 AST_APP_OPTION('n', BACKGROUND_NOANSWER),
110 AST_APP_OPTION('m', BACKGROUND_MATCHEXTEN),
111 AST_APP_OPTION('p', BACKGROUND_PLAYBACK),
114 #define WAITEXTEN_MOH (1 << 0)
115 #define WAITEXTEN_DIALTONE (1 << 1)
117 AST_APP_OPTIONS(waitexten_opts, {
118 AST_APP_OPTION_ARG('m', WAITEXTEN_MOH, 0),
119 AST_APP_OPTION_ARG('d', WAITEXTEN_DIALTONE, 0),
126 \brief ast_exten: An extension
127 The dialplan is saved as a linked list with each context
128 having it's own linked list of extensions - one item per
132 char *exten; /*!< Extension name */
133 int matchcid; /*!< Match caller id ? */
134 const char *cidmatch; /*!< Caller id to match for this extension */
135 int priority; /*!< Priority */
136 const char *label; /*!< Label */
137 struct ast_context *parent; /*!< The context this extension belongs to */
138 const char *app; /*!< Application to execute */
139 struct ast_app *cached_app; /*!< Cached location of application */
140 void *data; /*!< Data to use (arguments) */
141 void (*datad)(void *); /*!< Data destructor */
142 struct ast_exten *peer; /*!< Next higher priority with our extension */
143 struct ast_hashtab *peer_tree; /*!< Priorities list in tree form -- only on the head of the peer list */
144 struct ast_hashtab *peer_label_tree; /*!< labeled priorities in the peer list -- only on the head of the peer list */
145 const char *registrar; /*!< Registrar */
146 struct ast_exten *next; /*!< Extension with a greater ID */
150 /*! \brief ast_include: include= support in extensions.conf */
153 const char *rname; /*!< Context to include */
154 const char *registrar; /*!< Registrar */
155 int hastime; /*!< If time construct exists */
156 struct ast_timing timing; /*!< time construct */
157 struct ast_include *next; /*!< Link them together */
161 /*! \brief ast_sw: Switch statement in extensions.conf */
164 const char *registrar; /*!< Registrar */
165 char *data; /*!< Data load */
167 AST_LIST_ENTRY(ast_sw) list;
172 /*! \brief ast_ignorepat: Ignore patterns in dial plan */
173 struct ast_ignorepat {
174 const char *registrar;
175 struct ast_ignorepat *next;
176 const char pattern[0];
179 /*! \brief match_char: forms a syntax tree for quick matching of extension patterns */
182 int is_pattern; /* the pattern started with '_' */
183 int deleted; /* if this is set, then... don't return it */
184 char *x; /* the pattern itself-- matches a single char */
185 int specificity; /* simply the strlen of x, or 10 for X, 9 for Z, and 8 for N; and '.' and '!' will add 11 ? */
186 struct match_char *alt_char;
187 struct match_char *next_char;
188 struct ast_exten *exten; /* attached to last char of a pattern for exten */
191 struct scoreboard /* make sure all fields are 0 before calling new_find_extension */
193 int total_specificity;
195 char last_char; /* set to ! or . if they are the end of the pattern */
196 int canmatch; /* if the string to match was just too short */
197 struct match_char *node;
198 struct ast_exten *canmatch_exten;
199 struct ast_exten *exten;
202 /*! \brief ast_context: An extension context */
204 ast_rwlock_t lock; /*!< A lock to prevent multiple threads from clobbering the context */
205 struct ast_exten *root; /*!< The root of the list of extensions */
206 struct ast_hashtab *root_tree; /*!< For exact matches on the extensions in the pattern tree, and for traversals of the pattern_tree */
207 struct match_char *pattern_tree; /*!< A tree to speed up extension pattern matching */
208 struct ast_context *next; /*!< Link them together */
209 struct ast_include *includes; /*!< Include other contexts */
210 struct ast_ignorepat *ignorepats; /*!< Patterns for which to continue playing dialtone */
211 const char *registrar; /*!< Registrar */
212 AST_LIST_HEAD_NOLOCK(, ast_sw) alts; /*!< Alternative switches */
213 ast_mutex_t macrolock; /*!< A lock to implement "exclusive" macros - held whilst a call is executing in the macro */
214 char name[0]; /*!< Name of the context */
218 /*! \brief ast_app: A registered application */
220 int (*execute)(struct ast_channel *chan, void *data);
221 const char *synopsis; /*!< Synopsis text for 'show applications' */
222 const char *description; /*!< Description (help text) for 'show application <name>' */
223 AST_RWLIST_ENTRY(ast_app) list; /*!< Next app in list */
224 struct ast_module *module; /*!< Module this app belongs to */
225 char name[0]; /*!< Name of the application */
228 /*! \brief ast_state_cb: An extension state notify register item */
229 struct ast_state_cb {
232 ast_state_cb_type callback;
233 struct ast_state_cb *next;
236 /*! \brief Structure for dial plan hints
238 \note Hints are pointers from an extension in the dialplan to one or
239 more devices (tech/name)
240 - See \ref AstExtState
243 struct ast_exten *exten; /*!< Extension */
244 int laststate; /*!< Last known state */
245 struct ast_state_cb *callbacks; /*!< Callback list for this extension */
246 AST_RWLIST_ENTRY(ast_hint) list;/*!< Pointer to next hint in list */
249 static const struct cfextension_states {
251 const char * const text;
252 } extension_states[] = {
253 { AST_EXTENSION_NOT_INUSE, "Idle" },
254 { AST_EXTENSION_INUSE, "InUse" },
255 { AST_EXTENSION_BUSY, "Busy" },
256 { AST_EXTENSION_UNAVAILABLE, "Unavailable" },
257 { AST_EXTENSION_RINGING, "Ringing" },
258 { AST_EXTENSION_INUSE | AST_EXTENSION_RINGING, "InUse&Ringing" },
259 { AST_EXTENSION_ONHOLD, "Hold" },
260 { AST_EXTENSION_INUSE | AST_EXTENSION_ONHOLD, "InUse&Hold" }
264 AST_LIST_ENTRY(statechange) entry;
269 * \brief Data used by the device state thread
272 /*! Set to 1 to stop the thread */
274 /*! The device state monitoring thread */
276 /*! Lock for the state change queue */
278 /*! Condition for the state change queue */
280 /*! Queue of state changes */
281 AST_LIST_HEAD_NOLOCK(, statechange) state_change_q;
283 .thread = AST_PTHREADT_NULL,
286 struct pbx_exception {
287 AST_DECLARE_STRING_FIELDS(
288 AST_STRING_FIELD(context); /*!< Context associated with this exception */
289 AST_STRING_FIELD(exten); /*!< Exten associated with this exception */
290 AST_STRING_FIELD(reason); /*!< The exception reason */
293 int priority; /*!< Priority associated with this exception */
296 static int pbx_builtin_answer(struct ast_channel *, void *);
297 static int pbx_builtin_goto(struct ast_channel *, void *);
298 static int pbx_builtin_hangup(struct ast_channel *, void *);
299 static int pbx_builtin_background(struct ast_channel *, void *);
300 static int pbx_builtin_wait(struct ast_channel *, void *);
301 static int pbx_builtin_waitexten(struct ast_channel *, void *);
302 static int pbx_builtin_keepalive(struct ast_channel *, void *);
303 static int pbx_builtin_resetcdr(struct ast_channel *, void *);
304 static int pbx_builtin_setamaflags(struct ast_channel *, void *);
305 static int pbx_builtin_ringing(struct ast_channel *, void *);
306 static int pbx_builtin_progress(struct ast_channel *, void *);
307 static int pbx_builtin_congestion(struct ast_channel *, void *);
308 static int pbx_builtin_busy(struct ast_channel *, void *);
309 static int pbx_builtin_noop(struct ast_channel *, void *);
310 static int pbx_builtin_gotoif(struct ast_channel *, void *);
311 static int pbx_builtin_gotoiftime(struct ast_channel *, void *);
312 static int pbx_builtin_execiftime(struct ast_channel *, void *);
313 static int pbx_builtin_saynumber(struct ast_channel *, void *);
314 static int pbx_builtin_saydigits(struct ast_channel *, void *);
315 static int pbx_builtin_saycharacters(struct ast_channel *, void *);
316 static int pbx_builtin_sayphonetic(struct ast_channel *, void *);
317 static int matchcid(const char *cidpattern, const char *callerid);
318 int pbx_builtin_setvar(struct ast_channel *, void *);
319 void log_match_char_tree(struct match_char *node, char *prefix); /* for use anywhere */
320 static int pbx_builtin_setvar_multiple(struct ast_channel *, void *);
321 static int pbx_builtin_importvar(struct ast_channel *, void *);
322 static void set_ext_pri(struct ast_channel *c, const char *exten, int pri);
323 static void new_find_extension(const char *str, struct scoreboard *score, struct match_char *tree, int length, int spec, const char *callerid);
324 static struct match_char *already_in_tree(struct match_char *current, char *pat);
325 static struct match_char *add_exten_to_pattern_tree(struct ast_context *con, struct ast_exten *e1, int findonly);
326 static struct match_char *add_pattern_node(struct ast_context *con, struct match_char *current, char *pattern, int is_pattern, int already, int specificity);
327 static void create_match_char_tree(struct ast_context *con);
328 static struct ast_exten *get_canmatch_exten(struct match_char *node);
329 static void destroy_pattern_tree(struct match_char *pattern_tree);
330 static int hashtab_compare_contexts(const void *ah_a, const void *ah_b);
331 static int hashtab_compare_extens(const void *ha_a, const void *ah_b);
332 static int hashtab_compare_exten_numbers(const void *ah_a, const void *ah_b);
333 static int hashtab_compare_exten_labels(const void *ah_a, const void *ah_b);
334 static unsigned int hashtab_hash_contexts(const void *obj);
335 static unsigned int hashtab_hash_extens(const void *obj);
336 static unsigned int hashtab_hash_priority(const void *obj);
337 static unsigned int hashtab_hash_labels(const void *obj);
339 /* labels, contexts are case sensitive priority numbers are ints */
340 static int hashtab_compare_contexts(const void *ah_a, const void *ah_b)
342 const struct ast_context *ac = ah_a;
343 const struct ast_context *bc = ah_b;
344 /* assume context names are registered in a string table! */
345 return strcmp(ac->name, bc->name);
348 static int hashtab_compare_extens(const void *ah_a, const void *ah_b)
350 const struct ast_exten *ac = ah_a;
351 const struct ast_exten *bc = ah_b;
352 int x = strcmp(ac->exten, bc->exten);
353 if (x) /* if exten names are diff, then return */
355 /* but if they are the same, do the cidmatch values match? */
356 if (ac->matchcid && bc->matchcid) {
357 return strcmp(ac->cidmatch,bc->cidmatch);
358 } else if (!ac->matchcid && !bc->matchcid) {
359 return 0; /* if there's no matchcid on either side, then this is a match */
361 return 1; /* if there's matchcid on one but not the other, they are different */
365 static int hashtab_compare_exten_numbers(const void *ah_a, const void *ah_b)
367 const struct ast_exten *ac = ah_a;
368 const struct ast_exten *bc = ah_b;
369 return ac->priority != bc->priority;
372 static int hashtab_compare_exten_labels(const void *ah_a, const void *ah_b)
374 const struct ast_exten *ac = ah_a;
375 const struct ast_exten *bc = ah_b;
376 return strcmp(ac->label, bc->label);
379 static unsigned int hashtab_hash_contexts(const void *obj)
381 const struct ast_context *ac = obj;
382 return ast_hashtab_hash_string(ac->name);
385 static unsigned int hashtab_hash_extens(const void *obj)
387 const struct ast_exten *ac = obj;
388 unsigned int x = ast_hashtab_hash_string(ac->exten);
391 y = ast_hashtab_hash_string(ac->cidmatch);
395 static unsigned int hashtab_hash_priority(const void *obj)
397 const struct ast_exten *ac = obj;
398 return ast_hashtab_hash_int(ac->priority);
401 static unsigned int hashtab_hash_labels(const void *obj)
403 const struct ast_exten *ac = obj;
404 return ast_hashtab_hash_string(ac->label);
408 AST_RWLOCK_DEFINE_STATIC(globalslock);
409 static struct varshead globals = AST_LIST_HEAD_NOLOCK_INIT_VALUE;
411 static int autofallthrough = 1;
412 static int extenpatternmatchnew = 0;
414 /*! \brief Subscription for device state change events */
415 static struct ast_event_sub *device_state_sub;
417 AST_MUTEX_DEFINE_STATIC(maxcalllock);
418 static int countcalls;
419 static int totalcalls;
421 static AST_RWLIST_HEAD_STATIC(acf_root, ast_custom_function);
423 /*! \brief Declaration of builtin applications */
424 static struct pbx_builtin {
425 char name[AST_MAX_APP];
426 int (*execute)(struct ast_channel *chan, void *data);
431 /* These applications are built into the PBX core and do not
432 need separate modules */
434 { "Answer", pbx_builtin_answer,
435 "Answer a channel if ringing",
436 " Answer([delay]): If the call has not been answered, this application will\n"
437 "answer it. Otherwise, it has no effect on the call. If a delay is specified,\n"
438 "Asterisk will wait this number of milliseconds before returning to\n"
439 "the dialplan after answering the call.\n"
442 { "BackGround", pbx_builtin_background,
443 "Play an audio file while waiting for digits of an extension to go to.",
444 " Background(filename1[&filename2...][,options[,langoverride][,context]]):\n"
445 "This application will play the given list of files (do not put extension)\n"
446 "while waiting for an extension to be dialed by the calling channel. To\n"
447 "continue waiting for digits after this application has finished playing\n"
448 "files, the WaitExten application should be used. The 'langoverride' option\n"
449 "explicitly specifies which language to attempt to use for the requested sound\n"
450 "files. If a 'context' is specified, this is the dialplan context that this\n"
451 "application will use when exiting to a dialed extension."
452 " If one of the requested sound files does not exist, call processing will be\n"
455 " s - Causes the playback of the message to be skipped\n"
456 " if the channel is not in the 'up' state (i.e. it\n"
457 " hasn't been answered yet). If this happens, the\n"
458 " application will return immediately.\n"
459 " n - Don't answer the channel before playing the files.\n"
460 " m - Only break if a digit hit matches a one digit\n"
461 " extension in the destination context.\n"
462 "This application sets the following channel variable upon completion:\n"
463 " BACKGROUNDSTATUS The status of the background attempt as a text string, one of\n"
464 " SUCCESS | FAILED\n"
467 { "Busy", pbx_builtin_busy,
468 "Indicate the Busy condition",
469 " Busy([timeout]): This application will indicate the busy condition to\n"
470 "the calling channel. If the optional timeout is specified, the calling channel\n"
471 "will be hung up after the specified number of seconds. Otherwise, this\n"
472 "application will wait until the calling channel hangs up.\n"
475 { "Congestion", pbx_builtin_congestion,
476 "Indicate the Congestion condition",
477 " Congestion([timeout]): This application will indicate the congestion\n"
478 "condition to the calling channel. If the optional timeout is specified, the\n"
479 "calling channel will be hung up after the specified number of seconds.\n"
480 "Otherwise, this application will wait until the calling channel hangs up.\n"
483 { "ExecIfTime", pbx_builtin_execiftime,
484 "Conditional application execution based on the current time",
485 " ExecIfTime(<times>,<weekdays>,<mdays>,<months>?appname[(appargs)]):\n"
486 "This application will execute the specified dialplan application, with optional\n"
487 "arguments, if the current time matches the given time specification.\n"
490 { "Goto", pbx_builtin_goto,
491 "Jump to a particular priority, extension, or context",
492 " Goto([[context,]extension,]priority): This application will set the current\n"
493 "context, extension, and priority in the channel structure. After it completes, the\n"
494 "pbx engine will continue dialplan execution at the specified location.\n"
495 "If no specific extension, or extension and context, are specified, then this\n"
496 "application will just set the specified priority of the current extension.\n"
497 " At least a priority is required as an argument, or the goto will return a -1,\n"
498 "and the channel and call will be terminated.\n"
499 " If the location that is put into the channel information is bogus, and asterisk cannot\n"
500 "find that location in the dialplan,\n"
501 "then the execution engine will try to find and execute the code in the 'i' (invalid)\n"
502 "extension in the current context. If that does not exist, it will try to execute the\n"
503 "'h' extension. If either or neither the 'h' or 'i' extensions have been defined, the\n"
504 "channel is hung up, and the execution of instructions on the channel is terminated.\n"
505 "What this means is that, for example, you specify a context that does not exist, then\n"
506 "it will not be possible to find the 'h' or 'i' extensions, and the call will terminate!\n"
509 { "GotoIf", pbx_builtin_gotoif,
511 " GotoIf(condition?[labeliftrue]:[labeliffalse]): This application will set the current\n"
512 "context, extension, and priority in the channel structure based on the evaluation of\n"
513 "the given condition. After this application completes, the\n"
514 "pbx engine will continue dialplan execution at the specified location in the dialplan.\n"
515 "The channel will continue at\n"
516 "'labeliftrue' if the condition is true, or 'labeliffalse' if the condition is\n"
517 "false. The labels are specified with the same syntax as used within the Goto\n"
518 "application. If the label chosen by the condition is omitted, no jump is\n"
519 "performed, and the execution passes to the next instruction.\n"
520 "If the target location is bogus, and does not exist, the execution engine will try \n"
521 "to find and execute the code in the 'i' (invalid)\n"
522 "extension in the current context. If that does not exist, it will try to execute the\n"
523 "'h' extension. If either or neither the 'h' or 'i' extensions have been defined, the\n"
524 "channel is hung up, and the execution of instructions on the channel is terminated.\n"
525 "Remember that this command can set the current context, and if the context specified\n"
526 "does not exist, then it will not be able to find any 'h' or 'i' extensions there, and\n"
527 "the channel and call will both be terminated!\n"
530 { "GotoIfTime", pbx_builtin_gotoiftime,
531 "Conditional Goto based on the current time",
532 " GotoIfTime(<times>,<weekdays>,<mdays>,<months>?[[context,]exten,]priority):\n"
533 "This application will set the context, extension, and priority in the channel structure\n"
534 "if the current time matches the given time specification. Otherwise, nothing is done.\n"
535 "Further information on the time specification can be found in examples\n"
536 "illustrating how to do time-based context includes in the dialplan.\n"
537 "If the target jump location is bogus, the same actions would be taken as for Goto.\n"
540 { "ImportVar", pbx_builtin_importvar,
541 "Import a variable from a channel into a new variable",
542 " ImportVar(newvar=channelname,variable): This application imports a variable\n"
543 "from the specified channel (as opposed to the current one) and stores it as\n"
544 "a variable in the current channel (the channel that is calling this\n"
545 "application). Variables created by this application have the same inheritance\n"
546 "properties as those created with the Set application. See the documentation for\n"
547 "Set for more information.\n"
550 { "Hangup", pbx_builtin_hangup,
551 "Hang up the calling channel",
552 " Hangup([causecode]): This application will hang up the calling channel.\n"
553 "If a causecode is given the channel's hangup cause will be set to the given\n"
557 { "NoOp", pbx_builtin_noop,
558 "Do Nothing (No Operation)",
559 " NoOp(): This application does nothing. However, it is useful for debugging\n"
560 "purposes. Any text that is provided as arguments to this application can be\n"
561 "viewed at the Asterisk CLI. This method can be used to see the evaluations of\n"
562 "variables or functions without having any effect. Alternatively, see the\n"
563 "Verbose() application for finer grain control of output at custom verbose levels.\n"
566 { "Progress", pbx_builtin_progress,
568 " Progress(): This application will request that in-band progress information\n"
569 "be provided to the calling channel.\n"
572 { "RaiseException", pbx_builtin_raise_exception,
573 "Handle an exceptional condition",
574 " RaiseException(<reason>): This application will jump to the \"e\" extension\n"
575 "in the current context, setting the dialplan function EXCEPTION(). If the \"e\"\n"
576 "extension does not exist, the call will hangup.\n"
579 { "ResetCDR", pbx_builtin_resetcdr,
580 "Resets the Call Data Record",
581 " ResetCDR([options]): This application causes the Call Data Record to be\n"
584 " w -- Store the current CDR record before resetting it.\n"
585 " a -- Store any stacked records.\n"
586 " v -- Save CDR variables.\n"
589 { "Ringing", pbx_builtin_ringing,
590 "Indicate ringing tone",
591 " Ringing(): This application will request that the channel indicate a ringing\n"
592 "tone to the user.\n"
595 { "SayAlpha", pbx_builtin_saycharacters,
597 " SayAlpha(string): This application will play the sounds that correspond to\n"
598 "the letters of the given string.\n"
601 { "SayDigits", pbx_builtin_saydigits,
603 " SayDigits(digits): This application will play the sounds that correspond\n"
604 "to the digits of the given number. This will use the language that is currently\n"
605 "set for the channel. See the LANGUAGE function for more information on setting\n"
606 "the language for the channel.\n"
609 { "SayNumber", pbx_builtin_saynumber,
611 " SayNumber(digits[,gender]): This application will play the sounds that\n"
612 "correspond to the given number. Optionally, a gender may be specified.\n"
613 "This will use the language that is currently set for the channel. See the\n"
614 "LANGUAGE function for more information on setting the language for the channel.\n"
617 { "SayPhonetic", pbx_builtin_sayphonetic,
619 " SayPhonetic(string): This application will play the sounds from the phonetic\n"
620 "alphabet that correspond to the letters in the given string.\n"
623 { "Set", pbx_builtin_setvar,
624 "Set channel variable or function value",
626 "This function can be used to set the value of channel variables or dialplan\n"
627 "functions. When setting variables, if the variable name is prefixed with _,\n"
628 "the variable will be inherited into channels created from the current\n"
629 "channel. If the variable name is prefixed with __, the variable will be\n"
630 "inherited into channels created from the current channel and all children\n"
634 { "MSet", pbx_builtin_setvar_multiple,
635 "Set channel variable(s) or function value(s)",
636 " MSet(name1=value1,name2=value2,...)\n"
637 "This function can be used to set the value of channel variables or dialplan\n"
638 "functions. When setting variables, if the variable name is prefixed with _,\n"
639 "the variable will be inherited into channels created from the current\n"
640 "channel. If the variable name is prefixed with __, the variable will be\n"
641 "inherited into channels created from the current channel and all children\n"
643 "MSet behaves in a similar fashion to the way Set worked in 1.2/1.4 and is thus\n"
644 "prone to doing things that you may not expect. Avoid its use if possible.\n"
647 { "SetAMAFlags", pbx_builtin_setamaflags,
649 " SetAMAFlags([flag]): This application will set the channel's AMA Flags for\n"
650 " billing purposes.\n"
653 { "Wait", pbx_builtin_wait,
654 "Waits for some time",
655 " Wait(seconds): This application waits for a specified number of seconds.\n"
656 "Then, dialplan execution will continue at the next priority.\n"
657 " Note that the seconds can be passed with fractions of a second. For example,\n"
658 "'1.5' will ask the application to wait for 1.5 seconds.\n"
661 { "WaitExten", pbx_builtin_waitexten,
662 "Waits for an extension to be entered",
663 " WaitExten([seconds][,options]): This application waits for the user to enter\n"
664 "a new extension for a specified number of seconds.\n"
665 " Note that the seconds can be passed with fractions of a second. For example,\n"
666 "'1.5' will ask the application to wait for 1.5 seconds.\n"
668 " m[(x)] - Provide music on hold to the caller while waiting for an extension.\n"
669 " Optionally, specify the class for music on hold within parenthesis.\n"
672 { "KeepAlive", pbx_builtin_keepalive,
673 "returns AST_PBX_KEEPALIVE value",
674 " KeepAlive(): This application is chiefly meant for internal use with Gosubs.\n"
675 "Please do not run it alone from the dialplan!\n"
680 static struct ast_context *contexts;
681 static struct ast_hashtab *contexts_tree = NULL;
683 AST_RWLOCK_DEFINE_STATIC(conlock); /*!< Lock for the ast_context list */
685 static AST_RWLIST_HEAD_STATIC(apps, ast_app);
687 static AST_RWLIST_HEAD_STATIC(switches, ast_switch);
689 static int stateid = 1;
691 When holding this list's lock, do _not_ do anything that will cause conlock
692 to be taken, unless you _already_ hold it. The ast_merge_contexts_and_delete
693 function will take the locks in conlock/hints order, so any other
694 paths that require both locks must also take them in that order.
696 static AST_RWLIST_HEAD_STATIC(hints, ast_hint);
697 struct ast_state_cb *statecbs;
700 \note This function is special. It saves the stack so that no matter
701 how many times it is called, it returns to the same place */
702 int pbx_exec(struct ast_channel *c, /*!< Channel */
703 struct ast_app *app, /*!< Application */
704 void *data) /*!< Data for execution */
707 struct ast_module_user *u = NULL;
708 const char *saved_c_appl;
709 const char *saved_c_data;
711 if (c->cdr && !ast_check_hangup(c))
712 ast_cdr_setapp(c->cdr, app->name, data);
714 /* save channel values */
715 saved_c_appl= c->appl;
716 saved_c_data= c->data;
721 u = __ast_module_user_add(app->module, c);
722 res = app->execute(c, data);
723 if (app->module && u)
724 __ast_module_user_remove(app->module, u);
725 /* restore channel values */
726 c->appl = saved_c_appl;
727 c->data = saved_c_data;
732 /*! Go no deeper than this through includes (not counting loops) */
733 #define AST_PBX_MAX_STACK 128
735 /*! \brief Find application handle in linked list
737 struct ast_app *pbx_findapp(const char *app)
741 AST_RWLIST_RDLOCK(&apps);
742 AST_RWLIST_TRAVERSE(&apps, tmp, list) {
743 if (!strcasecmp(tmp->name, app))
746 AST_RWLIST_UNLOCK(&apps);
751 static struct ast_switch *pbx_findswitch(const char *sw)
753 struct ast_switch *asw;
755 AST_RWLIST_RDLOCK(&switches);
756 AST_RWLIST_TRAVERSE(&switches, asw, list) {
757 if (!strcasecmp(asw->name, sw))
760 AST_RWLIST_UNLOCK(&switches);
765 static inline int include_valid(struct ast_include *i)
770 return ast_check_timing(&(i->timing));
773 static void pbx_destroy(struct ast_pbx *p)
778 /* form a tree that fully describes all the patterns in a context's extensions
779 * in this tree, a "node" consists of a series of match_char structs linked in a chain
780 * via the alt_char pointers. More than one pattern can share the same parts of the
781 * tree as other extensions with the same pattern to that point. The algorithm to
782 * find which pattern best matches a string, would follow **all** matching paths. As
783 * complete matches are found, a "max" match record would be updated if the match first involves
784 * a longer string, then, on a tie, a smaller total of specificity. This can be accomplished
785 * by recursive calls affecting a shared scoreboard.
786 * As and example, consider these 4 extensions:
792 * In the above, between (a) and (d), (a) is a more specific pattern than (d), and would win over
793 * most numbers. For all numbers beginning with 307754, (b) should always win.
795 * These pattern should form a tree that looks like this:
796 * { "N" } --next--> { "X" } --next--> { "X" } --next--> { "N" } --next--> { "X" } ... blah ... --> { "X" exten_match: (a) }
800 * | { "X" } --next--> { "X" } ... blah ... --> { "X" exten_match: (d) }
802 * { "3" } --next--> { "0" } --next--> { "7" } --next--> { "7" } --next--> { "5" } ... blah ... --> { "X" exten_match: (b) }
806 * { "f" } --next--> { "a" } --next--> { "x" exten_match: (c) }
808 * In the above, I could easily turn "N" into "23456789", but I think that a quick "if( *z >= '2' && *z <= '9' )" might take
809 * fewer CPU cycles than a call to index("23456789",*z), where *z is the char to match...
811 * traversal is pretty simple: one routine merely traverses the alt list, and for each match in the pattern, it calls itself
812 * on the corresponding next pointer, incrementing also the pointer of the string to be matched, and passing the total specificity and length.
813 * We pass a pointer to a scoreboard down through, also.
814 * When an exten_match pointer is set, or a '.' or a '!' is encountered, we update the scoreboard only if the length is greater, or in case
815 * of equal length, if the specificity is lower, and return. Hope the limit on stack depth won't be a problem... this routine should
816 * be pretty lean as far a stack usage goes. Any non-match terminates the recursion down a branch.
818 * In the above example, with the number "3077549999" as the pattern, the traversor should match extensions a, b and d. All are
819 * of length 10; but they have total specificities of 96, 46, and 98, respectively. (b) wins with its lower specificity number!
821 * Just how much time this algorithm might save over a plain linear traversal over all possible patterns is unknown. But, it should
822 * be pretty close to optimal for this sort of overall algorithm.
826 /* you only really update the scoreboard, if the new score is BETTER than the
827 * one stored there. ignore it otherwise.
831 static void update_scoreboard(struct scoreboard *board, int length, int spec, struct ast_exten *exten, char last, const char *callerid, int deleted, struct match_char *node)
833 /* doing a matchcid() check here would be easy and cheap, but...
834 unfortunately, it only works if an extension can have only one
835 cid to match. That's not real life. CID patterns need to exist
836 in the tree for this sort of thing to work properly. */
838 /* if this extension is marked as deleted, then skip this -- if it never shows
839 on the scoreboard, it will never be found */
842 if (length > board->total_length) {
843 board->total_specificity = spec;
844 board->total_length = length;
845 board->exten = exten;
846 board->last_char = last;
848 } else if (length == board->total_length && spec < board->total_specificity) {
849 board->total_specificity = spec;
850 board->total_length = length;
851 board->exten = exten;
852 board->last_char = last;
857 void log_match_char_tree(struct match_char *node, char *prefix)
860 struct ast_str *my_prefix = ast_str_alloca(1024);
864 if (node && node->exten && node->exten)
865 snprintf(extenstr, sizeof(extenstr), "(%p)", node->exten);
867 if (strlen(node->x) > 1) {
868 ast_debug(1, "%s[%s]:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N',
869 node->deleted? 'D':'-', node->specificity, node->exten? "EXTEN:":"",
870 node->exten ? node->exten->exten : "", extenstr);
872 ast_debug(1, "%s%s:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N',
873 node->deleted? 'D':'-', node->specificity, node->exten? "EXTEN:":"",
874 node->exten ? node->exten->exten : "", extenstr);
877 ast_str_set(&my_prefix, 0, "%s+ ", prefix);
880 log_match_char_tree(node->next_char, my_prefix->str);
883 log_match_char_tree(node->alt_char, prefix);
886 static void cli_match_char_tree(struct match_char *node, char *prefix, int fd)
889 struct ast_str *my_prefix = ast_str_alloca(1024);
893 if (node && node->exten && node->exten)
894 snprintf(extenstr, sizeof(extenstr), "(%p)", node->exten);
896 if (strlen(node->x) > 1) {
897 ast_cli(fd, "%s[%s]:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y' : 'N',
898 node->deleted ? 'D' : '-', node->specificity, node->exten? "EXTEN:" : "",
899 node->exten ? node->exten->exten : "", extenstr);
901 ast_cli(fd, "%s%s:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y' : 'N',
902 node->deleted ? 'D' : '-', node->specificity, node->exten? "EXTEN:" : "",
903 node->exten ? node->exten->exten : "", extenstr);
906 ast_str_set(&my_prefix, 0, "%s+ ", prefix);
909 cli_match_char_tree(node->next_char, my_prefix->str, fd);
912 cli_match_char_tree(node->alt_char, prefix, fd);
915 static struct ast_exten *get_canmatch_exten(struct match_char *node)
917 /* find the exten at the end of the rope */
918 struct match_char *node2 = node;
920 for (node2 = node; node2; node2 = node2->next_char) {
928 static struct ast_exten *trie_find_next_match(struct match_char *node)
930 struct match_char *m3;
931 struct match_char *m4;
932 struct ast_exten *e3;
934 if (node && node->x[0] == '.' && !node->x[1]) /* dot and ! will ALWAYS be next match in a matchmore */
937 if (node && node->x[0] == '!' && !node->x[1])
940 if (!node || !node->next_char)
943 m3 = node->next_char;
947 for(m4=m3->alt_char; m4; m4 = m4->alt_char) {
951 for(m4=m3; m4; m4 = m4->alt_char) {
952 e3 = trie_find_next_match(m3);
959 static void new_find_extension(const char *str, struct scoreboard *score, struct match_char *tree, int length, int spec, const char *callerid)
961 struct match_char *p; /* note minimal stack storage requirements */
964 ast_log(LOG_NOTICE,"new_find_extension called with %s on (sub)tree %s\n", str, tree->x);
966 ast_log(LOG_NOTICE,"new_find_extension called with %s on (sub)tree NULL\n", str);
968 for (p=tree; p; p=p->alt_char) {
969 if (p->x[0] == 'N' && p->x[1] == 0 && *str >= '2' && *str <= '9' ) {
970 if (p->exten && !(*(str+1))) /* if a shorter pattern matches along the way, might as well report it */
971 update_scoreboard(score, length+1, spec+p->specificity, p->exten,0,callerid, p->deleted, p);
973 if (p->next_char && ( *(str+1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0))) {
975 new_find_extension(str+1, score, p->next_char, length+1, spec+p->specificity, callerid);
977 new_find_extension("/", score, p->next_char, length+1, spec+p->specificity, callerid);
978 } else if (p->next_char && !*(str+1)) {
980 score->canmatch_exten = get_canmatch_exten(p);
984 } else if (p->x[0] == 'Z' && p->x[1] == 0 && *str >= '1' && *str <= '9' ) {
985 if (p->exten && !(*(str+1))) /* if a shorter pattern matches along the way, might as well report it */
986 update_scoreboard(score, length+1, spec+p->specificity, p->exten,0,callerid, p->deleted,p);
988 if (p->next_char && ( *(str+1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0))) {
990 new_find_extension(str+1, score, p->next_char, length+1, spec+p->specificity, callerid);
992 new_find_extension("/", score, p->next_char, length+1, spec+p->specificity, callerid);
993 } else if (p->next_char && !*(str+1)) {
995 score->canmatch_exten = get_canmatch_exten(p);
999 } else if (p->x[0] == 'X' && p->x[1] == 0 && *str >= '0' && *str <= '9' ) {
1000 if (p->exten && !(*(str+1))) /* if a shorter pattern matches along the way, might as well report it */
1001 update_scoreboard(score, length+1, spec+p->specificity, p->exten,0,callerid, p->deleted,p);
1003 if (p->next_char && ( *(str+1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0))) {
1005 new_find_extension(str+1, score, p->next_char, length+1, spec+p->specificity, callerid);
1007 new_find_extension("/", score, p->next_char, length+1, spec+p->specificity, callerid);
1008 } else if (p->next_char && !*(str+1)) {
1009 score->canmatch = 1;
1010 score->canmatch_exten = get_canmatch_exten(p);
1014 } else if (p->x[0] == '.' && p->x[1] == 0) {
1015 /* how many chars will the . match against? */
1017 const char *str2 = str;
1021 if (p->exten && !(*(str+1)))
1022 update_scoreboard(score, length+i, spec+(i*p->specificity), p->exten, '.', callerid, p->deleted, p);
1023 if (p->next_char && p->next_char->x[0] == '/' && p->next_char->x[1] == 0) {
1024 new_find_extension("/", score, p->next_char, length+i, spec+(p->specificity*i), callerid);
1027 } else if (p->x[0] == '!' && p->x[1] == 0) {
1028 /* how many chars will the . match against? */
1030 const char *str2 = str;
1034 if (p->exten && !(*(str+1)))
1035 update_scoreboard(score, length+1, spec+(p->specificity*i), p->exten, '!', callerid, p->deleted, p);
1036 if (p->next_char && p->next_char->x[0] == '/' && p->next_char->x[1] == 0) {
1037 new_find_extension("/", score, p->next_char, length+i, spec+(p->specificity*i), callerid);
1040 } else if (p->x[0] == '/' && p->x[1] == 0) {
1041 /* the pattern in the tree includes the cid match! */
1042 if (p->next_char && callerid && *callerid) {
1043 new_find_extension(callerid, score, p->next_char, length+1, spec, callerid);
1045 } else if (index(p->x, *str)) {
1046 if (p->exten && !(*(str+1))) /* if a shorter pattern matches along the way, might as well report it */
1047 update_scoreboard(score, length+1, spec+p->specificity, p->exten,0,callerid, p->deleted, p);
1050 if (p->next_char && ( *(str+1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0))) {
1052 new_find_extension(str+1, score, p->next_char, length+1, spec+p->specificity, callerid);
1054 new_find_extension("/", score, p->next_char, length+1, spec+p->specificity, callerid);
1056 } else if (p->next_char && !*(str+1)) {
1057 score->canmatch = 1;
1058 score->canmatch_exten = get_canmatch_exten(p);
1066 /* the algorithm for forming the extension pattern tree is also a bit simple; you
1067 * traverse all the extensions in a context, and for each char of the extension,
1068 * you see if it exists in the tree; if it doesn't, you add it at the appropriate
1069 * spot. What more can I say? At the end of the list, you cap it off by adding the
1070 * address of the extension involved. Duplicate patterns will be complained about.
1072 * Ideally, this would be done for each context after it is created and fully
1073 * filled. It could be done as a finishing step after extensions.conf or .ael is
1074 * loaded, or it could be done when the first search is encountered. It should only
1075 * have to be done once, until the next unload or reload.
1077 * I guess forming this pattern tree would be analogous to compiling a regex.
1080 static struct match_char *already_in_tree(struct match_char *current, char *pat)
1082 struct match_char *t;
1085 for (t=current; t; t=t->alt_char) {
1086 if (strcmp(pat,t->x) == 0) /* uh, we may want to sort exploded [] contents to make matching easy */
1092 static struct match_char *add_pattern_node(struct ast_context *con, struct match_char *current, char *pattern, int is_pattern, int already, int specificity)
1094 struct match_char *m = ast_calloc(1,sizeof(struct match_char));
1095 m->x = ast_strdup(pattern);
1096 m->is_pattern = is_pattern;
1097 if (specificity == 1 && is_pattern && pattern[0] == 'N')
1098 m->specificity = 98;
1099 else if (specificity == 1 && is_pattern && pattern[0] == 'Z')
1100 m->specificity = 99;
1101 else if (specificity == 1 && is_pattern && pattern[0] == 'X')
1102 m->specificity = 100;
1103 else if (specificity == 1 && is_pattern && pattern[0] == '.')
1104 m->specificity = 200;
1105 else if (specificity == 1 && is_pattern && pattern[0] == '!')
1106 m->specificity = 200;
1108 m->specificity = specificity;
1110 if (!con->pattern_tree) {
1111 con->pattern_tree = m;
1113 if (already) { /* switch to the new regime (traversing vs appending)*/
1114 m->alt_char = current->alt_char;
1115 current->alt_char = m;
1117 if (current->next_char) {
1118 m->alt_char = current->next_char->alt_char;
1119 current->next_char = m;
1121 current->next_char = m;
1128 static struct match_char *add_exten_to_pattern_tree(struct ast_context *con, struct ast_exten *e1, int findonly)
1130 struct match_char *m1 = NULL, *m2 = NULL;
1136 char *s1 = extenbuf;
1137 int l1 = strlen(e1->exten) + strlen(e1->cidmatch) + 2;
1140 strncpy(extenbuf,e1->exten,sizeof(extenbuf));
1141 if (e1->matchcid && l1 <= sizeof(extenbuf)) {
1142 strcat(extenbuf,"/");
1143 strcat(extenbuf,e1->cidmatch);
1144 } else if (l1 > sizeof(extenbuf)) {
1145 ast_log(LOG_ERROR,"The pattern %s/%s is too big to deal with: it will be ignored! Disaster!\n", e1->exten, e1->cidmatch);
1149 ast_log(LOG_DEBUG,"Adding exten %s%c%s to tree\n", s1, e1->matchcid? '/':' ', e1->matchcid? e1->cidmatch : "");
1151 m1 = con->pattern_tree; /* each pattern starts over at the root of the pattern tree */
1159 if (pattern && *s1 == '[' && *(s1-1) != '\\') {
1162 s1++; /* get past the '[' */
1163 while (*s1 != ']' && *(s1-1) != '\\' ) {
1165 if (*(s1+1) == ']') {
1168 } else if (*(s1+1) == '\\') {
1171 } else if (*(s1+1) == '-') {
1174 } else if (*(s1+1) == '[') {
1178 } else if (*s1 == '-') { /* remember to add some error checking to all this! */
1181 for (s3++; s3 <= s4; s3++) {
1189 *s2 = 0; /* null terminate the exploded range */
1190 specif = strlen(buf);
1198 if (*s1 == 'n') /* make sure n,x,z patterns are canonicalized to N,X,Z */
1200 else if (*s1 == 'x')
1202 else if (*s1 == 'z')
1211 if (already && (m2=already_in_tree(m1,buf)) && m2->next_char) {
1212 if (!(*(s1+1))) { /* if this is the end of the pattern, but not the end of the tree, then mark this node with the exten...
1213 a shorter pattern might win if the longer one doesn't match */
1217 m1 = m2->next_char; /* m1 points to the node to compare against */
1226 m1 = add_pattern_node(con, m1, buf, pattern, already,specif); /* m1 is the node just added */
1236 s1++; /* advance to next char */
1241 static void create_match_char_tree(struct ast_context *con)
1243 struct ast_hashtab_iter *t1;
1244 struct ast_exten *e1;
1246 int biggest_bucket, resizes, numobjs, numbucks;
1248 ast_log(LOG_DEBUG,"Creating Extension Trie for context %s\n", con->name);
1249 ast_hashtab_get_stats(con->root_tree, &biggest_bucket, &resizes, &numobjs, &numbucks);
1250 ast_log(LOG_DEBUG,"This tree has %d objects in %d bucket lists, longest list=%d objects, and has resized %d times\n",
1251 numobjs, numbucks, biggest_bucket, resizes);
1253 t1 = ast_hashtab_start_traversal(con->root_tree);
1254 while( (e1 = ast_hashtab_next(t1)) ) {
1256 add_exten_to_pattern_tree(con, e1, 0);
1258 ast_log(LOG_ERROR,"Attempt to create extension with no extension name.\n");
1260 ast_hashtab_end_traversal(t1);
1263 static void destroy_pattern_tree(struct match_char *pattern_tree) /* pattern tree is a simple binary tree, sort of, so the proper way to destroy it is... recursively! */
1265 /* destroy all the alternates */
1266 if (pattern_tree->alt_char) {
1267 destroy_pattern_tree(pattern_tree->alt_char);
1268 pattern_tree->alt_char = 0;
1270 /* destroy all the nexts */
1271 if (pattern_tree->next_char) {
1272 destroy_pattern_tree(pattern_tree->next_char);
1273 pattern_tree->next_char = 0;
1275 pattern_tree->exten = 0; /* never hurts to make sure there's no pointers laying around */
1276 if (pattern_tree->x)
1277 free(pattern_tree->x);
1282 * Special characters used in patterns:
1283 * '_' underscore is the leading character of a pattern.
1284 * In other position it is treated as a regular char.
1285 * ' ' '-' space and '-' are separator and ignored.
1286 * . one or more of any character. Only allowed at the end of
1288 * ! zero or more of anything. Also impacts the result of CANMATCH
1289 * and MATCHMORE. Only allowed at the end of a pattern.
1290 * In the core routine, ! causes a match with a return code of 2.
1291 * In turn, depending on the search mode: (XXX check if it is implemented)
1292 * - E_MATCH retuns 1 (does match)
1293 * - E_MATCHMORE returns 0 (no match)
1294 * - E_CANMATCH returns 1 (does match)
1296 * / should not appear as it is considered the separator of the CID info.
1297 * XXX at the moment we may stop on this char.
1299 * X Z N match ranges 0-9, 1-9, 2-9 respectively.
1300 * [ denotes the start of a set of character. Everything inside
1301 * is considered literally. We can have ranges a-d and individual
1302 * characters. A '[' and '-' can be considered literally if they
1303 * are just before ']'.
1304 * XXX currently there is no way to specify ']' in a range, nor \ is
1305 * considered specially.
1307 * When we compare a pattern with a specific extension, all characters in the extension
1308 * itself are considered literally with the only exception of '-' which is considered
1309 * as a separator and thus ignored.
1310 * XXX do we want to consider space as a separator as well ?
1311 * XXX do we want to consider the separators in non-patterns as well ?
1315 * \brief helper functions to sort extensions and patterns in the desired way,
1316 * so that more specific patterns appear first.
1318 * ext_cmp1 compares individual characters (or sets of), returning
1319 * an int where bits 0-7 are the ASCII code of the first char in the set,
1320 * while bit 8-15 are the cardinality of the set minus 1.
1321 * This way more specific patterns (smaller cardinality) appear first.
1322 * Wildcards have a special value, so that we can directly compare them to
1323 * sets by subtracting the two values. In particular:
1324 * 0x000xx one character, xx
1325 * 0x0yyxx yy character set starting with xx
1326 * 0x10000 '.' (one or more of anything)
1327 * 0x20000 '!' (zero or more of anything)
1328 * 0x30000 NUL (end of string)
1329 * 0x40000 error in set.
1330 * The pointer to the string is advanced according to needs.
1332 * 1. the empty set is equivalent to NUL.
1333 * 2. given that a full set has always 0 as the first element,
1334 * we could encode the special cases as 0xffXX where XX
1335 * is 1, 2, 3, 4 as used above.
1337 static int ext_cmp1(const char **p)
1340 int c, cmin = 0xff, count = 0;
1343 /* load, sign extend and advance pointer until we find
1344 * a valid character.
1346 while ( (c = *(*p)++) && (c == ' ' || c == '-') )
1347 ; /* ignore some characters */
1349 /* always return unless we have a set of chars */
1351 default: /* ordinary character */
1352 return 0x0000 | (c & 0xff);
1354 case 'N': /* 2..9 */
1355 return 0x0700 | '2' ;
1357 case 'X': /* 0..9 */
1358 return 0x0900 | '0';
1360 case 'Z': /* 1..9 */
1361 return 0x0800 | '1';
1363 case '.': /* wildcard */
1366 case '!': /* earlymatch */
1367 return 0x20000; /* less specific than NULL */
1369 case '\0': /* empty string */
1373 case '[': /* pattern */
1376 /* locate end of set */
1377 end = strchr(*p, ']');
1380 ast_log(LOG_WARNING, "Wrong usage of [] in the extension\n");
1381 return 0x40000; /* XXX make this entry go last... */
1384 bzero(chars, sizeof(chars)); /* clear all chars in the set */
1385 for (; *p < end ; (*p)++) {
1386 unsigned char c1, c2; /* first-last char in range */
1387 c1 = (unsigned char)((*p)[0]);
1388 if (*p + 2 < end && (*p)[1] == '-') { /* this is a range */
1389 c2 = (unsigned char)((*p)[2]);
1390 *p += 2; /* skip a total of 3 chars */
1391 } else /* individual character */
1395 for (; c1 <= c2; c1++) {
1396 uint32_t mask = 1 << (c1 % 32);
1397 if ( (chars[ c1 / 32 ] & mask) == 0)
1399 chars[ c1 / 32 ] |= mask;
1403 return count == 0 ? 0x30000 : (count | cmin);
1407 * \brief the full routine to compare extensions in rules.
1409 static int ext_cmp(const char *a, const char *b)
1411 /* make sure non-patterns come first.
1412 * If a is not a pattern, it either comes first or
1413 * we use strcmp to compare the strings.
1418 return (b[0] == '_') ? -1 : strcmp(a, b);
1420 /* Now we know a is a pattern; if b is not, a comes first */
1423 #if 0 /* old mode for ext matching */
1424 return strcmp(a, b);
1426 /* ok we need full pattern sorting routine */
1427 while (!ret && a && b)
1428 ret = ext_cmp1(&a) - ext_cmp1(&b);
1432 return (ret > 0) ? 1 : -1;
1435 int ast_extension_cmp(const char *a, const char *b)
1437 return ext_cmp(a, b);
1442 * \brief used ast_extension_{match|close}
1443 * mode is as follows:
1444 * E_MATCH success only on exact match
1445 * E_MATCHMORE success only on partial match (i.e. leftover digits in pattern)
1446 * E_CANMATCH either of the above.
1447 * \retval 0 on no-match
1448 * \retval 1 on match
1449 * \retval 2 on early match.
1452 static int _extension_match_core(const char *pattern, const char *data, enum ext_match_t mode)
1454 mode &= E_MATCH_MASK; /* only consider the relevant bits */
1456 if ( (mode == E_MATCH) && (pattern[0] == '_') && (!strcasecmp(pattern,data)) ) /* note: if this test is left out, then _x. will not match _x. !!! */
1459 if (pattern[0] != '_') { /* not a pattern, try exact or partial match */
1460 int ld = strlen(data), lp = strlen(pattern);
1462 if (lp < ld) /* pattern too short, cannot match */
1464 /* depending on the mode, accept full or partial match or both */
1465 if (mode == E_MATCH)
1466 return !strcmp(pattern, data); /* 1 on match, 0 on fail */
1467 if (ld == 0 || !strncasecmp(pattern, data, ld)) /* partial or full match */
1468 return (mode == E_MATCHMORE) ? lp > ld : 1; /* XXX should consider '!' and '/' ? */
1472 pattern++; /* skip leading _ */
1474 * XXX below we stop at '/' which is a separator for the CID info. However we should
1475 * not store '/' in the pattern at all. When we insure it, we can remove the checks.
1477 while (*data && *pattern && *pattern != '/') {
1480 if (*data == '-') { /* skip '-' in data (just a separator) */
1484 switch (toupper(*pattern)) {
1485 case '[': /* a range */
1486 end = strchr(pattern+1, ']'); /* XXX should deal with escapes ? */
1488 ast_log(LOG_WARNING, "Wrong usage of [] in the extension\n");
1489 return 0; /* unconditional failure */
1491 for (pattern++; pattern != end; pattern++) {
1492 if (pattern+2 < end && pattern[1] == '-') { /* this is a range */
1493 if (*data >= pattern[0] && *data <= pattern[2])
1494 break; /* match found */
1496 pattern += 2; /* skip a total of 3 chars */
1499 } else if (*data == pattern[0])
1500 break; /* match found */
1504 pattern = end; /* skip and continue */
1507 if (*data < '2' || *data > '9')
1511 if (*data < '0' || *data > '9')
1515 if (*data < '1' || *data > '9')
1518 case '.': /* Must match, even with more digits */
1520 case '!': /* Early match */
1523 case '-': /* Ignore these in patterns */
1524 data--; /* compensate the final data++ */
1527 if (*data != *pattern)
1533 if (*data) /* data longer than pattern, no match */
1536 * match so far, but ran off the end of the data.
1537 * Depending on what is next, determine match or not.
1539 if (*pattern == '\0' || *pattern == '/') /* exact match */
1540 return (mode == E_MATCHMORE) ? 0 : 1; /* this is a failure for E_MATCHMORE */
1541 else if (*pattern == '!') /* early match */
1543 else /* partial match */
1544 return (mode == E_MATCH) ? 0 : 1; /* this is a failure for E_MATCH */
1548 * Wrapper around _extension_match_core() to do performance measurement
1549 * using the profiling code.
1551 static int extension_match_core(const char *pattern, const char *data, enum ext_match_t mode)
1554 static int prof_id = -2; /* marker for 'unallocated' id */
1556 prof_id = ast_add_profile("ext_match", 0);
1557 ast_mark(prof_id, 1);
1558 i = _extension_match_core(pattern, data, mode);
1559 ast_mark(prof_id, 0);
1563 int ast_extension_match(const char *pattern, const char *data)
1565 return extension_match_core(pattern, data, E_MATCH);
1568 int ast_extension_close(const char *pattern, const char *data, int needmore)
1570 if (needmore != E_MATCHMORE && needmore != E_CANMATCH)
1571 ast_log(LOG_WARNING, "invalid argument %d\n", needmore);
1572 return extension_match_core(pattern, data, needmore);
1575 struct fake_context /* this struct is purely for matching in the hashtab */
1578 struct ast_exten *root;
1579 struct ast_hashtab *root_tree;
1580 struct match_char *pattern_tree;
1581 struct ast_context *next;
1582 struct ast_include *includes;
1583 struct ast_ignorepat *ignorepats;
1584 const char *registrar;
1585 AST_LIST_HEAD_NOLOCK(, ast_sw) alts;
1586 ast_mutex_t macrolock;
1590 struct ast_context *ast_context_find(const char *name)
1592 struct ast_context *tmp = NULL;
1593 struct fake_context item;
1594 strncpy(item.name,name,256);
1595 ast_rdlock_contexts();
1596 if( contexts_tree ) {
1597 tmp = ast_hashtab_lookup(contexts_tree,&item);
1599 while ( (tmp = ast_walk_contexts(tmp)) ) {
1600 if (!name || !strcasecmp(name, tmp->name))
1604 ast_unlock_contexts();
1608 #define STATUS_NO_CONTEXT 1
1609 #define STATUS_NO_EXTENSION 2
1610 #define STATUS_NO_PRIORITY 3
1611 #define STATUS_NO_LABEL 4
1612 #define STATUS_SUCCESS 5
1614 static int matchcid(const char *cidpattern, const char *callerid)
1616 /* If the Caller*ID pattern is empty, then we're matching NO Caller*ID, so
1617 failing to get a number should count as a match, otherwise not */
1619 if (ast_strlen_zero(callerid))
1620 return ast_strlen_zero(cidpattern) ? 1 : 0;
1622 return ast_extension_match(cidpattern, callerid);
1625 struct ast_exten *pbx_find_extension(struct ast_channel *chan,
1626 struct ast_context *bypass, struct pbx_find_info *q,
1627 const char *context, const char *exten, int priority,
1628 const char *label, const char *callerid, enum ext_match_t action)
1631 struct ast_context *tmp = NULL;
1632 struct ast_exten *e = NULL, *eroot = NULL;
1633 struct ast_include *i = NULL;
1634 struct ast_sw *sw = NULL;
1635 struct ast_exten pattern = {NULL, };
1636 struct scoreboard score = {0, };
1638 pattern.label = label;
1639 pattern.priority = priority;
1641 ast_log(LOG_NOTICE,"Looking for cont/ext/prio/label/action = %s/%s/%d/%s/%d\n", context, exten, priority, label, (int)action);
1643 /* Initialize status if appropriate */
1644 if (q->stacklen == 0) {
1645 q->status = STATUS_NO_CONTEXT;
1648 q->foundcontext = NULL;
1649 } else if (q->stacklen >= AST_PBX_MAX_STACK) {
1650 ast_log(LOG_WARNING, "Maximum PBX stack exceeded\n");
1654 /* Check first to see if we've already been checked */
1655 for (x = 0; x < q->stacklen; x++) {
1656 if (!strcasecmp(q->incstack[x], context))
1660 if (bypass) /* bypass means we only look there */
1662 else { /* look in contexts */
1663 struct fake_context item;
1664 strncpy(item.name,context,256);
1665 tmp = ast_hashtab_lookup(contexts_tree,&item);
1668 while ((tmp = ast_walk_contexts(tmp)) ) {
1669 if (!strcmp(tmp->name, context))
1678 if (q->status < STATUS_NO_EXTENSION)
1679 q->status = STATUS_NO_EXTENSION;
1681 /* Do a search for matching extension */
1684 score.total_specificity = 0;
1686 score.total_length = 0;
1687 if (!tmp->pattern_tree && tmp->root_tree)
1689 create_match_char_tree(tmp);
1691 ast_log(LOG_DEBUG,"Tree Created in context %s:\n", context);
1692 log_match_char_tree(tmp->pattern_tree," ");
1696 ast_log(LOG_NOTICE,"The Trie we are searching in:\n");
1697 log_match_char_tree(tmp->pattern_tree, ":: ");
1700 if (extenpatternmatchnew) {
1701 new_find_extension(exten, &score, tmp->pattern_tree, 0, 0, callerid);
1702 eroot = score.exten;
1704 if (score.last_char == '!' && action == E_MATCHMORE) {
1705 /* We match an extension ending in '!'.
1706 * The decision in this case is final and is NULL (no match).
1709 ast_log(LOG_NOTICE,"Returning MATCHMORE NULL with exclamation point.\n");
1714 if (!eroot && (action == E_CANMATCH || action == E_MATCHMORE) && score.canmatch_exten) {
1715 q->status = STATUS_SUCCESS;
1717 ast_log(LOG_NOTICE,"Returning CANMATCH exten %s\n", score.canmatch_exten->exten);
1719 return score.canmatch_exten;
1722 if ((action == E_MATCHMORE || action == E_CANMATCH) && eroot) {
1724 struct ast_exten *z = trie_find_next_match(score.node);
1727 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE next_match exten %s\n", z->exten);
1729 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE next_match exten NULL\n");
1734 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE NULL (no next_match)\n");
1736 return NULL; /* according to the code, complete matches are null matches in MATCHMORE mode */
1740 /* found entry, now look for the right priority */
1741 if (q->status < STATUS_NO_PRIORITY)
1742 q->status = STATUS_NO_PRIORITY;
1744 if (action == E_FINDLABEL && label ) {
1745 if (q->status < STATUS_NO_LABEL)
1746 q->status = STATUS_NO_LABEL;
1747 e = ast_hashtab_lookup(eroot->peer_label_tree, &pattern);
1749 e = ast_hashtab_lookup(eroot->peer_tree, &pattern);
1751 if (e) { /* found a valid match */
1752 q->status = STATUS_SUCCESS;
1753 q->foundcontext = context;
1755 ast_log(LOG_NOTICE,"Returning complete match of exten %s\n", e->exten);
1762 /* scan the list trying to match extension and CID */
1764 while ( (eroot = ast_walk_context_extensions(tmp, eroot)) ) {
1765 int match = extension_match_core(eroot->exten, exten, action);
1766 /* 0 on fail, 1 on match, 2 on earlymatch */
1768 if (!match || (eroot->matchcid && !matchcid(eroot->cidmatch, callerid)))
1769 continue; /* keep trying */
1770 if (match == 2 && action == E_MATCHMORE) {
1771 /* We match an extension ending in '!'.
1772 * The decision in this case is final and is NULL (no match).
1776 /* found entry, now look for the right priority */
1777 if (q->status < STATUS_NO_PRIORITY)
1778 q->status = STATUS_NO_PRIORITY;
1780 if (action == E_FINDLABEL && label ) {
1781 if (q->status < STATUS_NO_LABEL)
1782 q->status = STATUS_NO_LABEL;
1783 e = ast_hashtab_lookup(eroot->peer_label_tree, &pattern);
1785 e = ast_hashtab_lookup(eroot->peer_tree, &pattern);
1788 while ( (e = ast_walk_extension_priorities(eroot, e)) ) {
1789 /* Match label or priority */
1790 if (action == E_FINDLABEL) {
1791 if (q->status < STATUS_NO_LABEL)
1792 q->status = STATUS_NO_LABEL;
1793 if (label && e->label && !strcmp(label, e->label))
1794 break; /* found it */
1795 } else if (e->priority == priority) {
1796 break; /* found it */
1797 } /* else keep searching */
1800 if (e) { /* found a valid match */
1801 q->status = STATUS_SUCCESS;
1802 q->foundcontext = context;
1809 /* Check alternative switches */
1810 AST_LIST_TRAVERSE(&tmp->alts, sw, list) {
1811 struct ast_switch *asw = pbx_findswitch(sw->name);
1812 ast_switch_f *aswf = NULL;
1816 ast_log(LOG_WARNING, "No such switch '%s'\n", sw->name);
1819 /* Substitute variables now */
1822 pbx_substitute_variables_helper(chan, sw->data, sw->tmpdata, SWITCH_DATA_LENGTH - 1);
1824 /* equivalent of extension_match_core() at the switch level */
1825 if (action == E_CANMATCH)
1826 aswf = asw->canmatch;
1827 else if (action == E_MATCHMORE)
1828 aswf = asw->matchmore;
1829 else /* action == E_MATCH */
1831 datap = sw->eval ? sw->tmpdata : sw->data;
1836 ast_autoservice_start(chan);
1837 res = aswf(chan, context, exten, priority, callerid, datap);
1839 ast_autoservice_stop(chan);
1841 if (res) { /* Got a match */
1844 q->foundcontext = context;
1845 /* XXX keep status = STATUS_NO_CONTEXT ? */
1849 q->incstack[q->stacklen++] = tmp->name; /* Setup the stack */
1850 /* Now try any includes we have in this context */
1851 for (i = tmp->includes; i; i = i->next) {
1852 if (include_valid(i)) {
1853 if ((e = pbx_find_extension(chan, bypass, q, i->rname, exten, priority, label, callerid, action))) {
1855 ast_log(LOG_NOTICE,"Returning recursive match of %s\n", e->exten);
1867 * \brief extract offset:length from variable name.
1868 * \return 1 if there is a offset:length part, which is
1869 * trimmed off (values go into variables)
1871 static int parse_variable_name(char *var, int *offset, int *length, int *isfunc)
1878 for (; *var; var++) {
1882 } else if (*var == ')') {
1884 } else if (*var == ':' && parens == 0) {
1886 sscanf(var, "%d:%d", offset, length);
1887 return 1; /* offset:length valid */
1894 *\brief takes a substring. It is ok to call with value == workspace.
1896 * \param offset < 0 means start from the end of the string and set the beginning
1897 * to be that many characters back.
1898 * \param length is the length of the substring, a value less than 0 means to leave
1899 * that many off the end.
1901 * \param workspace_len
1902 * Always return a copy in workspace.
1904 static char *substring(const char *value, int offset, int length, char *workspace, size_t workspace_len)
1906 char *ret = workspace;
1907 int lr; /* length of the input string after the copy */
1909 ast_copy_string(workspace, value, workspace_len); /* always make a copy */
1911 lr = strlen(ret); /* compute length after copy, so we never go out of the workspace */
1913 /* Quick check if no need to do anything */
1914 if (offset == 0 && length >= lr) /* take the whole string */
1917 if (offset < 0) { /* translate negative offset into positive ones */
1918 offset = lr + offset;
1919 if (offset < 0) /* If the negative offset was greater than the length of the string, just start at the beginning */
1923 /* too large offset result in empty string so we know what to return */
1925 return ret + lr; /* the final '\0' */
1927 ret += offset; /* move to the start position */
1928 if (length >= 0 && length < lr - offset) /* truncate if necessary */
1930 else if (length < 0) {
1931 if (lr > offset - length) /* After we remove from the front and from the rear, is there anything left? */
1932 ret[lr + length - offset] = '\0';
1940 /*! \brief Support for Asterisk built-in variables in the dialplan
1943 - \ref AstVar Channel variables
1944 - \ref AstCauses The HANGUPCAUSE variable
1946 void pbx_retrieve_variable(struct ast_channel *c, const char *var, char **ret, char *workspace, int workspacelen, struct varshead *headp)
1948 const char not_found = '\0';
1950 const char *s; /* the result */
1952 int i, need_substring;
1953 struct varshead *places[2] = { headp, &globals }; /* list of places where we may look */
1956 ast_channel_lock(c);
1957 places[0] = &c->varshead;
1960 * Make a copy of var because parse_variable_name() modifies the string.
1961 * Then if called directly, we might need to run substring() on the result;
1962 * remember this for later in 'need_substring', 'offset' and 'length'
1964 tmpvar = ast_strdupa(var); /* parse_variable_name modifies the string */
1965 need_substring = parse_variable_name(tmpvar, &offset, &length, &i /* ignored */);
1968 * Look first into predefined variables, then into variable lists.
1969 * Variable 's' points to the result, according to the following rules:
1970 * s == ¬_found (set at the beginning) means that we did not find a
1971 * matching variable and need to look into more places.
1972 * If s != ¬_found, s is a valid result string as follows:
1973 * s = NULL if the variable does not have a value;
1974 * you typically do this when looking for an unset predefined variable.
1975 * s = workspace if the result has been assembled there;
1976 * typically done when the result is built e.g. with an snprintf(),
1977 * so we don't need to do an additional copy.
1978 * s != workspace in case we have a string, that needs to be copied
1979 * (the ast_copy_string is done once for all at the end).
1980 * Typically done when the result is already available in some string.
1982 s = ¬_found; /* default value */
1983 if (c) { /* This group requires a valid channel */
1984 /* Names with common parts are looked up a piece at a time using strncmp. */
1985 if (!strncmp(var, "CALL", 4)) {
1986 if (!strncmp(var + 4, "ING", 3)) {
1987 if (!strcmp(var + 7, "PRES")) { /* CALLINGPRES */
1988 snprintf(workspace, workspacelen, "%d", c->cid.cid_pres);
1990 } else if (!strcmp(var + 7, "ANI2")) { /* CALLINGANI2 */
1991 snprintf(workspace, workspacelen, "%d", c->cid.cid_ani2);
1993 } else if (!strcmp(var + 7, "TON")) { /* CALLINGTON */
1994 snprintf(workspace, workspacelen, "%d", c->cid.cid_ton);
1996 } else if (!strcmp(var + 7, "TNS")) { /* CALLINGTNS */
1997 snprintf(workspace, workspacelen, "%d", c->cid.cid_tns);
2001 } else if (!strcmp(var, "HINT")) {
2002 s = ast_get_hint(workspace, workspacelen, NULL, 0, c, c->context, c->exten) ? workspace : NULL;
2003 } else if (!strcmp(var, "HINTNAME")) {
2004 s = ast_get_hint(NULL, 0, workspace, workspacelen, c, c->context, c->exten) ? workspace : NULL;
2005 } else if (!strcmp(var, "EXTEN")) {
2007 } else if (!strcmp(var, "CONTEXT")) {
2009 } else if (!strcmp(var, "PRIORITY")) {
2010 snprintf(workspace, workspacelen, "%d", c->priority);
2012 } else if (!strcmp(var, "CHANNEL")) {
2014 } else if (!strcmp(var, "UNIQUEID")) {
2016 } else if (!strcmp(var, "HANGUPCAUSE")) {
2017 snprintf(workspace, workspacelen, "%d", c->hangupcause);
2021 if (s == ¬_found) { /* look for more */
2022 if (!strcmp(var, "EPOCH")) {
2023 snprintf(workspace, workspacelen, "%u",(int)time(NULL));
2025 } else if (!strcmp(var, "SYSTEMNAME")) {
2026 s = ast_config_AST_SYSTEM_NAME;
2029 /* if not found, look into chanvars or global vars */
2030 for (i = 0; s == ¬_found && i < (sizeof(places) / sizeof(places[0])); i++) {
2031 struct ast_var_t *variables;
2034 if (places[i] == &globals)
2035 ast_rwlock_rdlock(&globalslock);
2036 AST_LIST_TRAVERSE(places[i], variables, entries) {
2037 if (!strcasecmp(ast_var_name(variables), var)) {
2038 s = ast_var_value(variables);
2042 if (places[i] == &globals)
2043 ast_rwlock_unlock(&globalslock);
2045 if (s == ¬_found || s == NULL)
2049 ast_copy_string(workspace, s, workspacelen);
2052 *ret = substring(*ret, offset, length, workspace, workspacelen);
2056 ast_channel_unlock(c);
2059 static void exception_store_free(void *data)
2061 struct pbx_exception *exception = data;
2062 ast_string_field_free_memory(exception);
2063 ast_free(exception);
2066 static struct ast_datastore_info exception_store_info = {
2067 .type = "EXCEPTION",
2068 .destroy = exception_store_free,
2071 int pbx_builtin_raise_exception(struct ast_channel *chan, void *vreason)
2073 const char *reason = vreason;
2074 struct ast_datastore *ds = ast_channel_datastore_find(chan, &exception_store_info, NULL);
2075 struct pbx_exception *exception = NULL;
2078 ds = ast_channel_datastore_alloc(&exception_store_info, NULL);
2081 exception = ast_calloc(1, sizeof(struct pbx_exception));
2083 ast_channel_datastore_free(ds);
2086 if (ast_string_field_init(exception, 128)) {
2087 ast_free(exception);
2088 ast_channel_datastore_free(ds);
2091 ds->data = exception;
2092 ast_channel_datastore_add(chan, ds);
2094 exception = ds->data;
2096 ast_string_field_set(exception, reason, reason);
2097 ast_string_field_set(exception, context, chan->context);
2098 ast_string_field_set(exception, exten, chan->exten);
2099 exception->priority = chan->priority;
2100 set_ext_pri(chan, "e", 0);
2104 static int acf_exception_read(struct ast_channel *chan, const char *name, char *data, char *buf, size_t buflen)
2106 struct ast_datastore *ds = ast_channel_datastore_find(chan, &exception_store_info, NULL);
2107 struct pbx_exception *exception = NULL;
2108 if (!ds || !ds->data)
2110 exception = ds->data;
2111 if (!strcasecmp(data, "REASON"))
2112 ast_copy_string(buf, exception->reason, buflen);
2113 else if (!strcasecmp(data, "CONTEXT"))
2114 ast_copy_string(buf, exception->context, buflen);
2115 else if (!strncasecmp(data, "EXTEN", 5))
2116 ast_copy_string(buf, exception->exten, buflen);
2117 else if (!strcasecmp(data, "PRIORITY"))
2118 snprintf(buf, buflen, "%d", exception->priority);
2124 static struct ast_custom_function exception_function = {
2125 .name = "EXCEPTION",
2126 .synopsis = "Retrieve the details of the current dialplan exception",
2128 "The following fields are available for retrieval:\n"
2129 " reason INVALID, ERROR, RESPONSETIMEOUT, ABSOLUTETIMEOUT, or custom\n"
2130 " value set by the RaiseException() application\n"
2131 " context The context executing when the exception occurred\n"
2132 " exten The extension executing when the exception occurred\n"
2133 " priority The numeric priority executing when the exception occurred\n",
2134 .syntax = "EXCEPTION(<field>)",
2135 .read = acf_exception_read,
2138 static char *handle_show_functions(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
2140 struct ast_custom_function *acf;
2146 e->command = "core show functions [like]";
2148 "Usage: core show functions [like <text>]\n"
2149 " List builtin functions, optionally only those matching a given string\n";
2155 if (a->argc == 5 && (!strcmp(a->argv[3], "like")) ) {
2157 } else if (a->argc != 3) {
2158 return CLI_SHOWUSAGE;
2161 ast_cli(a->fd, "%s Custom Functions:\n--------------------------------------------------------------------------------\n", like ? "Matching" : "Installed");
2163 AST_RWLIST_RDLOCK(&acf_root);
2164 AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
2165 if (!like || strstr(acf->name, a->argv[4])) {
2167 ast_cli(a->fd, "%-20.20s %-35.35s %s\n", acf->name, acf->syntax, acf->synopsis);
2170 AST_RWLIST_UNLOCK(&acf_root);
2172 ast_cli(a->fd, "%d %scustom functions installed.\n", count_acf, like ? "matching " : "");
2177 static char *handle_show_function(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
2179 struct ast_custom_function *acf;
2180 /* Maximum number of characters added by terminal coloring is 22 */
2181 char infotitle[64 + AST_MAX_APP + 22], syntitle[40], destitle[40];
2182 char info[64 + AST_MAX_APP], *synopsis = NULL, *description = NULL;
2183 char stxtitle[40], *syntax = NULL;
2184 int synopsis_size, description_size, syntax_size;
2191 e->command = "core show function";
2193 "Usage: core show function <function>\n"
2194 " Describe a particular dialplan function.\n";
2197 wordlen = strlen(a->word);
2198 /* case-insensitive for convenience in this 'complete' function */
2199 AST_RWLIST_RDLOCK(&acf_root);
2200 AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
2201 if (!strncasecmp(a->word, acf->name, wordlen) && ++which > a->n) {
2202 ret = ast_strdup(acf->name);
2206 AST_RWLIST_UNLOCK(&acf_root);
2212 return CLI_SHOWUSAGE;
2214 if (!(acf = ast_custom_function_find(a->argv[3]))) {
2215 ast_cli(a->fd, "No function by that name registered.\n");
2221 synopsis_size = strlen(acf->synopsis) + 23;
2223 synopsis_size = strlen("Not available") + 23;
2224 synopsis = alloca(synopsis_size);
2227 description_size = strlen(acf->desc) + 23;
2229 description_size = strlen("Not available") + 23;
2230 description = alloca(description_size);
2233 syntax_size = strlen(acf->syntax) + 23;
2235 syntax_size = strlen("Not available") + 23;
2236 syntax = alloca(syntax_size);
2238 snprintf(info, 64 + AST_MAX_APP, "\n -= Info about function '%s' =- \n\n", acf->name);
2239 term_color(infotitle, info, COLOR_MAGENTA, 0, 64 + AST_MAX_APP + 22);
2240 term_color(stxtitle, "[Syntax]\n", COLOR_MAGENTA, 0, 40);
2241 term_color(syntitle, "[Synopsis]\n", COLOR_MAGENTA, 0, 40);
2242 term_color(destitle, "[Description]\n", COLOR_MAGENTA, 0, 40);
2244 acf->syntax ? acf->syntax : "Not available",
2245 COLOR_CYAN, 0, syntax_size);
2246 term_color(synopsis,
2247 acf->synopsis ? acf->synopsis : "Not available",
2248 COLOR_CYAN, 0, synopsis_size);
2249 term_color(description,
2250 acf->desc ? acf->desc : "Not available",
2251 COLOR_CYAN, 0, description_size);
2253 ast_cli(a->fd,"%s%s%s\n\n%s%s\n\n%s%s\n", infotitle, stxtitle, syntax, syntitle, synopsis, destitle, description);
2258 struct ast_custom_function *ast_custom_function_find(const char *name)
2260 struct ast_custom_function *acf = NULL;
2262 AST_RWLIST_RDLOCK(&acf_root);
2263 AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
2264 if (!strcmp(name, acf->name))
2267 AST_RWLIST_UNLOCK(&acf_root);
2272 int ast_custom_function_unregister(struct ast_custom_function *acf)
2274 struct ast_custom_function *cur;
2279 AST_RWLIST_WRLOCK(&acf_root);
2280 if ((cur = AST_RWLIST_REMOVE(&acf_root, acf, acflist)))
2281 ast_verb(2, "Unregistered custom function %s\n", cur->name);
2282 AST_RWLIST_UNLOCK(&acf_root);
2284 return cur ? 0 : -1;
2287 int __ast_custom_function_register(struct ast_custom_function *acf, struct ast_module *mod)
2289 struct ast_custom_function *cur;
2297 AST_RWLIST_WRLOCK(&acf_root);
2299 AST_RWLIST_TRAVERSE(&acf_root, cur, acflist) {
2300 if (!strcmp(acf->name, cur->name)) {
2301 ast_log(LOG_ERROR, "Function %s already registered.\n", acf->name);
2302 AST_RWLIST_UNLOCK(&acf_root);
2307 /* Store in alphabetical order */
2308 AST_RWLIST_TRAVERSE_SAFE_BEGIN(&acf_root, cur, acflist) {
2309 if (strcasecmp(acf->name, cur->name) < 0) {
2310 AST_RWLIST_INSERT_BEFORE_CURRENT(acf, acflist);
2314 AST_RWLIST_TRAVERSE_SAFE_END;
2316 AST_RWLIST_INSERT_TAIL(&acf_root, acf, acflist);
2318 AST_RWLIST_UNLOCK(&acf_root);
2320 ast_verb(2, "Registered custom function '%s'\n", term_color(tmps, acf->name, COLOR_BRCYAN, 0, sizeof(tmps)));
2325 /*! \brief return a pointer to the arguments of the function,
2326 * and terminates the function name with '\\0'
2328 static char *func_args(char *function)
2330 char *args = strchr(function, '(');
2333 ast_log(LOG_WARNING, "Function doesn't contain parentheses. Assuming null argument.\n");
2337 if ((p = strrchr(args, ')')) )
2340 ast_log(LOG_WARNING, "Can't find trailing parenthesis?\n");
2345 int ast_func_read(struct ast_channel *chan, const char *function, char *workspace, size_t len)
2347 char *copy = ast_strdupa(function);
2348 char *args = func_args(copy);
2349 struct ast_custom_function *acfptr = ast_custom_function_find(copy);
2352 ast_log(LOG_ERROR, "Function %s not registered\n", copy);
2353 else if (!acfptr->read)
2354 ast_log(LOG_ERROR, "Function %s cannot be read\n", copy);
2357 struct ast_module_user *u = NULL;
2359 u = __ast_module_user_add(acfptr->mod, chan);
2360 res = acfptr->read(chan, copy, args, workspace, len);
2361 if (acfptr->mod && u)
2362 __ast_module_user_remove(acfptr->mod, u);
2368 int ast_func_write(struct ast_channel *chan, const char *function, const char *value)
2370 char *copy = ast_strdupa(function);
2371 char *args = func_args(copy);
2372 struct ast_custom_function *acfptr = ast_custom_function_find(copy);
2375 ast_log(LOG_ERROR, "Function %s not registered\n", copy);
2376 else if (!acfptr->write)
2377 ast_log(LOG_ERROR, "Function %s cannot be written to\n", copy);
2380 struct ast_module_user *u = NULL;
2382 u = __ast_module_user_add(acfptr->mod, chan);
2383 res = acfptr->write(chan, copy, args, value);
2384 if (acfptr->mod && u)
2385 __ast_module_user_remove(acfptr->mod, u);
2392 static void pbx_substitute_variables_helper_full(struct ast_channel *c, struct varshead *headp, const char *cp1, char *cp2, int count)
2394 /* Substitutes variables into cp2, based on string cp1, cp2 NO LONGER NEEDS TO BE ZEROED OUT!!!! */
2396 const char *tmp, *whereweare;
2397 int length, offset, offset2, isfunction;
2398 char *workspace = NULL;
2399 char *ltmp = NULL, *var = NULL;
2400 char *nextvar, *nextexp, *nextthing;
2402 int pos, brackets, needsub, len;
2404 *cp2 = 0; /* just in case nothing ends up there */
2406 while (!ast_strlen_zero(whereweare) && count) {
2407 /* Assume we're copying the whole remaining string */
2408 pos = strlen(whereweare);
2411 nextthing = strchr(whereweare, '$');
2413 switch (nextthing[1]) {
2415 nextvar = nextthing;
2416 pos = nextvar - whereweare;
2419 nextexp = nextthing;
2420 pos = nextexp - whereweare;
2428 /* Can't copy more than 'count' bytes */
2432 /* Copy that many bytes */
2433 memcpy(cp2, whereweare, pos);
2442 /* We have a variable. Find the start and end, and determine
2443 if we are going to have to recursively call ourselves on the
2445 vars = vare = nextvar + 2;
2449 /* Find the end of it */
2450 while (brackets && *vare) {
2451 if ((vare[0] == '$') && (vare[1] == '{')) {
2453 } else if (vare[0] == '{') {
2455 } else if (vare[0] == '}') {
2457 } else if ((vare[0] == '$') && (vare[1] == '['))
2462 ast_log(LOG_NOTICE, "Error in extension logic (missing '}')\n");
2463 len = vare - vars - 1;
2465 /* Skip totally over variable string */
2466 whereweare += (len + 3);
2469 var = alloca(VAR_BUF_SIZE);
2471 /* Store variable name (and truncate) */
2472 ast_copy_string(var, vars, len + 1);
2474 /* Substitute if necessary */
2477 ltmp = alloca(VAR_BUF_SIZE);
2479 pbx_substitute_variables_helper_full(c, headp, var, ltmp, VAR_BUF_SIZE - 1);
2486 workspace = alloca(VAR_BUF_SIZE);
2488 workspace[0] = '\0';
2490 parse_variable_name(vars, &offset, &offset2, &isfunction);
2492 /* Evaluate function */
2494 cp4 = ast_func_read(c, vars, workspace, VAR_BUF_SIZE) ? NULL : workspace;
2496 struct varshead old;
2497 struct ast_channel *c = ast_channel_alloc(0, 0, "", "", "", "", "", 0, "Bogus/%p", vars);
2499 memcpy(&old, &c->varshead, sizeof(old));
2500 memcpy(&c->varshead, headp, sizeof(c->varshead));
2501 cp4 = ast_func_read(c, vars, workspace, VAR_BUF_SIZE) ? NULL : workspace;
2502 /* Don't deallocate the varshead that was passed in */
2503 memcpy(&c->varshead, &old, sizeof(c->varshead));
2504 ast_channel_free(c);
2506 ast_log(LOG_ERROR, "Unable to allocate bogus channel for variable substitution. Function results may be blank.\n");
2508 ast_debug(1, "Function result is '%s'\n", cp4 ? cp4 : "(null)");
2510 /* Retrieve variable value */
2511 pbx_retrieve_variable(c, vars, &cp4, workspace, VAR_BUF_SIZE, headp);
2514 cp4 = substring(cp4, offset, offset2, workspace, VAR_BUF_SIZE);
2516 length = strlen(cp4);
2519 memcpy(cp2, cp4, length);
2524 } else if (nextexp) {
2525 /* We have an expression. Find the start and end, and determine
2526 if we are going to have to recursively call ourselves on the
2528 vars = vare = nextexp + 2;
2532 /* Find the end of it */
2533 while (brackets && *vare) {
2534 if ((vare[0] == '$') && (vare[1] == '[')) {
2538 } else if (vare[0] == '[') {
2540 } else if (vare[0] == ']') {
2542 } else if ((vare[0] == '$') && (vare[1] == '{')) {
2549 ast_log(LOG_NOTICE, "Error in extension logic (missing ']')\n");
2550 len = vare - vars - 1;
2552 /* Skip totally over expression */
2553 whereweare += (len + 3);
2556 var = alloca(VAR_BUF_SIZE);
2558 /* Store variable name (and truncate) */
2559 ast_copy_string(var, vars, len + 1);
2561 /* Substitute if necessary */
2564 ltmp = alloca(VAR_BUF_SIZE);
2566 pbx_substitute_variables_helper_full(c, headp, var, ltmp, VAR_BUF_SIZE - 1);
2572 length = ast_expr(vars, cp2, count, c);
2575 ast_debug(1, "Expression result is '%s'\n", cp2);
2584 void pbx_substitute_variables_helper(struct ast_channel *c, const char *cp1, char *cp2, int count)
2586 pbx_substitute_variables_helper_full(c, (c) ? &c->varshead : NULL, cp1, cp2, count);
2589 void pbx_substitute_variables_varshead(struct varshead *headp, const char *cp1, char *cp2, int count)
2591 pbx_substitute_variables_helper_full(NULL, headp, cp1, cp2, count);
2594 static void pbx_substitute_variables(char *passdata, int datalen, struct ast_channel *c, struct ast_exten *e)
2598 /* Nothing more to do */
2602 /* No variables or expressions in e->data, so why scan it? */
2603 if ((!(tmp = strchr(e->data, '$'))) || (!strstr(tmp, "${") && !strstr(tmp, "$["))) {
2604 ast_copy_string(passdata, e->data, datalen);
2608 pbx_substitute_variables_helper(c, e->data, passdata, datalen - 1);
2612 * \brief The return value depends on the action:
2614 * E_MATCH, E_CANMATCH, E_MATCHMORE require a real match,
2615 * and return 0 on failure, -1 on match;
2616 * E_FINDLABEL maps the label to a priority, and returns
2617 * the priority on success, ... XXX
2618 * E_SPAWN, spawn an application,
2620 * \retval 0 on success.
2621 * \retval -1 on failure.
2623 * \note The channel is auto-serviced in this function, because doing an extension
2624 * match may block for a long time. For example, if the lookup has to use a network
2625 * dialplan switch, such as DUNDi or IAX2, it may take a while. However, the channel
2626 * auto-service code will queue up any important signalling frames to be processed
2627 * after this is done.
2629 static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
2630 const char *context, const char *exten, int priority,
2631 const char *label, const char *callerid, enum ext_match_t action, int *found, int combined_find_spawn)
2633 struct ast_exten *e;
2634 struct ast_app *app;
2636 struct pbx_find_info q = { .stacklen = 0 }; /* the rest is reset in pbx_find_extension */
2637 char passdata[EXT_DATA_SIZE];
2639 int matching_action = (action == E_MATCH || action == E_CANMATCH || action == E_MATCHMORE);
2641 ast_rdlock_contexts();
2645 e = pbx_find_extension(c, con, &q, context, exten, priority, label, callerid, action);
2649 if (matching_action) {
2650 ast_unlock_contexts();
2651 return -1; /* success, we found it */
2652 } else if (action == E_FINDLABEL) { /* map the label to a priority */
2654 ast_unlock_contexts();
2655 return res; /* the priority we were looking for */
2656 } else { /* spawn */
2658 e->cached_app = pbx_findapp(e->app);
2659 app = e->cached_app;
2660 ast_unlock_contexts();
2662 ast_log(LOG_WARNING, "No application '%s' for extension (%s, %s, %d)\n", e->app, context, exten, priority);
2665 if (c->context != context)
2666 ast_copy_string(c->context, context, sizeof(c->context));
2667 if (c->exten != exten)
2668 ast_copy_string(c->exten, exten, sizeof(c->exten));
2669 c->priority = priority;
2670 pbx_substitute_variables(passdata, sizeof(passdata), c, e);
2671 ast_debug(1, "Launching '%s'\n", app->name);
2672 if (VERBOSITY_ATLEAST(3)) {
2673 char tmp[80], tmp2[80], tmp3[EXT_DATA_SIZE];
2674 ast_verb(3, "Executing [%s@%s:%d] %s(\"%s\", \"%s\") %s\n",
2675 exten, context, priority,
2676 term_color(tmp, app->name, COLOR_BRCYAN, 0, sizeof(tmp)),
2677 term_color(tmp2, c->name, COLOR_BRMAGENTA, 0, sizeof(tmp2)),
2678 term_color(tmp3, passdata, COLOR_BRMAGENTA, 0, sizeof(tmp3)),
2681 manager_event(EVENT_FLAG_DIALPLAN, "Newexten",
2686 "Application: %s\r\n"
2689 c->name, c->context, c->exten, c->priority, app->name, passdata, c->uniqueid);
2690 return pbx_exec(c, app, passdata); /* 0 on success, -1 on failure */
2692 } else if (q.swo) { /* not found here, but in another switch */
2693 ast_unlock_contexts();
2694 if (matching_action) {
2698 ast_log(LOG_WARNING, "No execution engine for switch %s\n", q.swo->name);
2701 return q.swo->exec(c, q.foundcontext ? q.foundcontext : context, exten, priority, callerid, q.data);
2703 } else { /* not found anywhere, see what happened */
2704 ast_unlock_contexts();
2706 case STATUS_NO_CONTEXT:
2707 if (!matching_action && !combined_find_spawn)
2708 ast_log(LOG_NOTICE, "Cannot find extension context '%s'\n", context);
2710 case STATUS_NO_EXTENSION:
2711 if (!matching_action && !combined_find_spawn)
2712 ast_log(LOG_NOTICE, "Cannot find extension '%s' in context '%s'\n", exten, context);
2714 case STATUS_NO_PRIORITY:
2715 if (!matching_action && !combined_find_spawn)
2716 ast_log(LOG_NOTICE, "No such priority %d in extension '%s' in context '%s'\n", priority, exten, context);
2718 case STATUS_NO_LABEL:
2719 if (context && !combined_find_spawn)
2720 ast_log(LOG_NOTICE, "No such label '%s' in extension '%s' in context '%s'\n", label, exten, context);
2723 ast_debug(1, "Shouldn't happen!\n");
2726 return (matching_action) ? 0 : -1;
2730 /*! \brief Find hint for given extension in context */
2731 static struct ast_exten *ast_hint_extension(struct ast_channel *c, const char *context, const char *exten)
2733 struct ast_exten *e;
2734 struct pbx_find_info q = { .stacklen = 0 }; /* the rest is set in pbx_find_context */
2736 ast_rdlock_contexts();
2737 e = pbx_find_extension(c, NULL, &q, context, exten, PRIORITY_HINT, NULL, "", E_MATCH);
2738 ast_unlock_contexts();
2743 /*! \brief Check state of extension by using hints */
2744 static int ast_extension_state2(struct ast_exten *e)
2746 char hint[AST_MAX_EXTENSION];
2748 int allunavailable = 1, allbusy = 1, allfree = 1, allonhold = 1;
2749 int busy = 0, inuse = 0, ring = 0;
2754 ast_copy_string(hint, ast_get_extension_app(e), sizeof(hint));
2756 rest = hint; /* One or more devices separated with a & character */
2757 while ( (cur = strsep(&rest, "&")) ) {
2758 int res = ast_device_state(cur);
2760 case AST_DEVICE_NOT_INUSE:
2765 case AST_DEVICE_INUSE:
2771 case AST_DEVICE_RINGING:
2777 case AST_DEVICE_RINGINUSE:
2784 case AST_DEVICE_ONHOLD:
2788 case AST_DEVICE_BUSY:
2794 case AST_DEVICE_UNAVAILABLE:
2795 case AST_DEVICE_INVALID:
2809 return AST_EXTENSION_RINGING;
2811 return (AST_EXTENSION_INUSE | AST_EXTENSION_RINGING);
2813 return AST_EXTENSION_INUSE;
2815 return AST_EXTENSION_NOT_INUSE;
2817 return AST_EXTENSION_ONHOLD;
2819 return AST_EXTENSION_BUSY;
2821 return AST_EXTENSION_UNAVAILABLE;
2823 return AST_EXTENSION_INUSE;
2825 return AST_EXTENSION_NOT_INUSE;
2828 /*! \brief Return extension_state as string */
2829 const char *ast_extension_state2str(int extension_state)
2833 for (i = 0; (i < (sizeof(extension_states) / sizeof(extension_states[0]))); i++) {
2834 if (extension_states[i].extension_state == extension_state)
2835 return extension_states[i].text;
2840 /*! \brief Check extension state for an extension by using hint */
2841 int ast_extension_state(struct ast_channel *c, const char *context, const char *exten)
2843 struct ast_exten *e;
2845 e = ast_hint_extension(c, context, exten); /* Do we have a hint for this extension ? */
2847 return -1; /* No hint, return -1 */
2849 return ast_extension_state2(e); /* Check all devices in the hint */
2852 static void handle_statechange(const char *device)
2854 struct ast_hint *hint;
2856 AST_RWLIST_RDLOCK(&hints);
2858 AST_RWLIST_TRAVERSE(&hints, hint, list) {
2859 struct ast_state_cb *cblist;
2860 char buf[AST_MAX_EXTENSION];
2865 ast_copy_string(buf, ast_get_extension_app(hint->exten), sizeof(buf));
2866 while ( (cur = strsep(&parse, "&")) ) {
2867 if (!strcasecmp(cur, device))
2873 /* Get device state for this hint */
2874 state = ast_extension_state2(hint->exten);
2876 if ((state == -1) || (state == hint->laststate))
2879 /* Device state changed since last check - notify the watchers */
2881 /* For general callbacks */
2882 for (cblist = statecbs; cblist; cblist = cblist->next)
2883 cblist->callback(hint->exten->parent->name, hint->exten->exten, state, cblist->data);
2885 /* For extension callbacks */
2886 for (cblist = hint->callbacks; cblist; cblist = cblist->next)
2887 cblist->callback(hint->exten->parent->name, hint->exten->exten, state, cblist->data);
2889 hint->laststate = state; /* record we saw the change */
2892 AST_RWLIST_UNLOCK(&hints);
2895 static int statechange_queue(const char *dev)
2897 struct statechange *sc;
2899 if (!(sc = ast_calloc(1, sizeof(*sc) + strlen(dev) + 1)))
2902 strcpy(sc->dev, dev);
2904 ast_mutex_lock(&device_state.lock);
2905 AST_LIST_INSERT_TAIL(&device_state.state_change_q, sc, entry);
2906 ast_cond_signal(&device_state.cond);
2907 ast_mutex_unlock(&device_state.lock);
2912 static void *device_state_thread(void *data)
2914 struct statechange *sc;
2916 while (!device_state.stop) {
2917 ast_mutex_lock(&device_state.lock);
2918 while (!(sc = AST_LIST_REMOVE_HEAD(&device_state.state_change_q, entry))) {
2919 ast_cond_wait(&device_state.cond, &device_state.lock);
2920 /* Check to see if we were woken up to see the request to stop */
2921 if (device_state.stop) {
2922 ast_mutex_unlock(&device_state.lock);
2926 ast_mutex_unlock(&device_state.lock);
2928 handle_statechange(sc->dev);
2936 /*! \brief Add watcher for extension states */
2937 int ast_extension_state_add(const char *context, const char *exten,
2938 ast_state_cb_type callback, void *data)
2940 struct ast_hint *hint;
2941 struct ast_state_cb *cblist;
2942 struct ast_exten *e;
2944 /* If there's no context and extension: add callback to statecbs list */
2945 if (!context && !exten) {
2946 AST_RWLIST_WRLOCK(&hints);
2948 for (cblist = statecbs; cblist; cblist = cblist->next) {
2949 if (cblist->callback == callback) {
2950 cblist->data = data;
2951 AST_RWLIST_UNLOCK(&hints);
2956 /* Now insert the callback */
2957 if (!(cblist = ast_calloc(1, sizeof(*cblist)))) {
2958 AST_RWLIST_UNLOCK(&hints);
2962 cblist->callback = callback;
2963 cblist->data = data;
2965 cblist->next = statecbs;
2968 AST_RWLIST_UNLOCK(&hints);
2972 if (!context || !exten)
2975 /* This callback type is for only one hint, so get the hint */
2976 e = ast_hint_extension(NULL, context, exten);
2981 /* Find the hint in the list of hints */
2982 AST_RWLIST_WRLOCK(&hints);
2984 AST_RWLIST_TRAVERSE(&hints, hint, list) {
2985 if (hint->exten == e)
2990 /* We have no hint, sorry */
2991 AST_RWLIST_UNLOCK(&hints);
2995 /* Now insert the callback in the callback list */
2996 if (!(cblist = ast_calloc(1, sizeof(*cblist)))) {
2997 AST_RWLIST_UNLOCK(&hints);
3000 cblist->id = stateid++; /* Unique ID for this callback */
3001 cblist->callback = callback; /* Pointer to callback routine */
3002 cblist->data = data; /* Data for the callback */
3004 cblist->next = hint->callbacks;
3005 hint->callbacks = cblist;
3007 AST_RWLIST_UNLOCK(&hints);
3011 /*! \brief Remove a watcher from the callback list */
3012 int ast_extension_state_del(int id, ast_state_cb_type callback)
3014 struct ast_state_cb **p_cur = NULL; /* address of pointer to us */
3017 if (!id && !callback)
3020 AST_RWLIST_WRLOCK(&hints);
3022 if (!id) { /* id == 0 is a callback without extension */
3023 for (p_cur = &statecbs; *p_cur; p_cur = &(*p_cur)->next) {
3024 if ((*p_cur)->callback == callback)
3027 } else { /* callback with extension, find the callback based on ID */
3028 struct ast_hint *hint;
3029 AST_RWLIST_TRAVERSE(&hints, hint, list) {
3030 for (p_cur = &hint->callbacks; *p_cur; p_cur = &(*p_cur)->next) {
3031 if ((*p_cur)->id == id)
3034 if (*p_cur) /* found in the inner loop */
3038 if (p_cur && *p_cur) {
3039 struct ast_state_cb *cur = *p_cur;
3044 AST_RWLIST_UNLOCK(&hints);
3048 /*! \brief Add hint to hint list, check initial extension state */
3049 static int ast_add_hint(struct ast_exten *e)
3051 struct ast_hint *hint;
3056 AST_RWLIST_WRLOCK(&hints);
3058 /* Search if hint exists, do nothing */
3059 AST_RWLIST_TRAVERSE(&hints, hint, list) {
3060 if (hint->exten == e) {
3061 AST_RWLIST_UNLOCK(&hints);
3062 ast_debug(2, "HINTS: Not re-adding existing hint %s: %s\n", ast_get_extension_name(e), ast_get_extension_app(e));
3067 ast_debug(2, "HINTS: Adding hint %s: %s\n", ast_get_extension_name(e), ast_get_extension_app(e));
3069 if (!(hint = ast_calloc(1, sizeof(*hint)))) {
3070 AST_RWLIST_UNLOCK(&hints);
3073 /* Initialize and insert new item at the top */
3075 hint->laststate = ast_extension_state2(e);
3076 AST_RWLIST_INSERT_HEAD(&hints, hint, list);
3078 AST_RWLIST_UNLOCK(&hints);
3082 /*! \brief Change hint for an extension */
3083 static int ast_change_hint(struct ast_exten *oe, struct ast_exten *ne)
3085 struct ast_hint *hint;
3088 AST_RWLIST_WRLOCK(&hints);
3089 AST_RWLIST_TRAVERSE(&hints, hint, list) {
3090 if (hint->exten == oe) {
3096 AST_RWLIST_UNLOCK(&hints);
3101 /*! \brief Remove hint from extension */
3102 static int ast_remove_hint(struct ast_exten *e)
3104 /* Cleanup the Notifys if hint is removed */