2 * Asterisk -- An open source telephony toolkit.
4 * Copyright (C) 1999 - 2006, 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)
859 char my_prefix[1024];
863 if (node && node->exten && node->exten)
864 sprintf(extenstr,"(%p)",node->exten);
866 if (strlen(node->x) > 1 )
867 ast_log(LOG_DEBUG,"%s[%s]:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N', node->deleted? 'D':'-', node->specificity, node->exten? "EXTEN:":"", node->exten ? node->exten->exten : "", extenstr);
869 ast_log(LOG_DEBUG,"%s%s:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N', node->deleted? 'D':'-', node->specificity, node->exten? "EXTEN:":"", node->exten ? node->exten->exten : "", extenstr);
870 strcpy(my_prefix,prefix);
871 strcat(my_prefix,"+ ");
873 log_match_char_tree(node->next_char, my_prefix);
875 log_match_char_tree(node->alt_char, prefix);
878 static void cli_match_char_tree(struct match_char *node, char *prefix, int fd)
880 char my_prefix[1024];
884 if (node && node->exten && node->exten)
885 sprintf(extenstr,"(%p)",node->exten);
887 if (strlen(node->x) > 1)
888 ast_cli(fd, "%s[%s]:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N', node->deleted ? 'D' : '-', node->specificity, node->exten? "EXTEN:":"", node->exten ? node->exten->exten : "", extenstr);
890 ast_cli(fd, "%s%s:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N', node->deleted ? 'D' : '-', node->specificity, node->exten? "EXTEN:":"", node->exten ? node->exten->exten : "", extenstr);
891 strcpy(my_prefix,prefix);
892 strcat(my_prefix,"+ ");
894 cli_match_char_tree(node->next_char, my_prefix, fd);
896 cli_match_char_tree(node->alt_char, prefix, fd);
899 static struct ast_exten *get_canmatch_exten(struct match_char *node)
901 /* find the exten at the end of the rope */
902 struct match_char *node2 = node;
903 for (node2 = node; node2; node2 = node2->next_char)
909 static struct ast_exten *trie_find_next_match(struct match_char *node)
911 struct match_char *m3;
912 struct match_char *m4;
913 struct ast_exten *e3;
915 if (node && node->x[0] == '.' && !node->x[1]) /* dot and ! will ALWAYS be next match in a matchmore */
918 if (node && node->x[0] == '!' && !node->x[1])
921 if (!node || !node->next_char)
924 m3 = node->next_char;
928 for(m4=m3->alt_char; m4; m4 = m4->alt_char) {
932 for(m4=m3; m4; m4 = m4->alt_char) {
933 e3 = trie_find_next_match(m3);
940 static void new_find_extension(const char *str, struct scoreboard *score, struct match_char *tree, int length, int spec, const char *callerid)
942 struct match_char *p; /* note minimal stack storage requirements */
945 ast_log(LOG_NOTICE,"new_find_extension called with %s on (sub)tree %s\n", str, tree->x);
947 ast_log(LOG_NOTICE,"new_find_extension called with %s on (sub)tree NULL\n", str);
949 for (p=tree; p; p=p->alt_char) {
950 if (p->x[0] == 'N' && p->x[1] == 0 && *str >= '2' && *str <= '9' ) {
951 if (p->exten && !(*(str+1))) /* if a shorter pattern matches along the way, might as well report it */
952 update_scoreboard(score, length+1, spec+p->specificity, p->exten,0,callerid, p->deleted, p);
954 if (p->next_char && ( *(str+1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0))) {
956 new_find_extension(str+1, score, p->next_char, length+1, spec+p->specificity, callerid);
958 new_find_extension("/", score, p->next_char, length+1, spec+p->specificity, callerid);
959 } else if (p->next_char && !*(str+1)) {
961 score->canmatch_exten = get_canmatch_exten(p);
965 } else if (p->x[0] == 'Z' && p->x[1] == 0 && *str >= '1' && *str <= '9' ) {
966 if (p->exten && !(*(str+1))) /* if a shorter pattern matches along the way, might as well report it */
967 update_scoreboard(score, length+1, spec+p->specificity, p->exten,0,callerid, p->deleted,p);
969 if (p->next_char && ( *(str+1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0))) {
971 new_find_extension(str+1, score, p->next_char, length+1, spec+p->specificity, callerid);
973 new_find_extension("/", score, p->next_char, length+1, spec+p->specificity, callerid);
974 } else if (p->next_char && !*(str+1)) {
976 score->canmatch_exten = get_canmatch_exten(p);
980 } else if (p->x[0] == 'X' && p->x[1] == 0 && *str >= '0' && *str <= '9' ) {
981 if (p->exten && !(*(str+1))) /* if a shorter pattern matches along the way, might as well report it */
982 update_scoreboard(score, length+1, spec+p->specificity, p->exten,0,callerid, p->deleted,p);
984 if (p->next_char && ( *(str+1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0))) {
986 new_find_extension(str+1, score, p->next_char, length+1, spec+p->specificity, callerid);
988 new_find_extension("/", score, p->next_char, length+1, spec+p->specificity, callerid);
989 } else if (p->next_char && !*(str+1)) {
991 score->canmatch_exten = get_canmatch_exten(p);
995 } else if (p->x[0] == '.' && p->x[1] == 0) {
996 /* how many chars will the . match against? */
998 const char *str2 = str;
1002 if (p->exten && !(*(str+1)))
1003 update_scoreboard(score, length+i, spec+(i*p->specificity), p->exten, '.', callerid, p->deleted, p);
1004 if (p->next_char && p->next_char->x[0] == '/' && p->next_char->x[1] == 0) {
1005 new_find_extension("/", score, p->next_char, length+i, spec+(p->specificity*i), callerid);
1008 } else if (p->x[0] == '!' && p->x[1] == 0) {
1009 /* how many chars will the . match against? */
1011 const char *str2 = str;
1015 if (p->exten && !(*(str+1)))
1016 update_scoreboard(score, length+1, spec+(p->specificity*i), p->exten, '!', callerid, p->deleted, p);
1017 if (p->next_char && p->next_char->x[0] == '/' && p->next_char->x[1] == 0) {
1018 new_find_extension("/", score, p->next_char, length+i, spec+(p->specificity*i), callerid);
1021 } else if (p->x[0] == '/' && p->x[1] == 0) {
1022 /* the pattern in the tree includes the cid match! */
1023 if (p->next_char && callerid && *callerid) {
1024 new_find_extension(callerid, score, p->next_char, length+1, spec, callerid);
1026 } else if (index(p->x, *str)) {
1027 if (p->exten && !(*(str+1))) /* if a shorter pattern matches along the way, might as well report it */
1028 update_scoreboard(score, length+1, spec+p->specificity, p->exten,0,callerid, p->deleted, p);
1031 if (p->next_char && ( *(str+1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0))) {
1033 new_find_extension(str+1, score, p->next_char, length+1, spec+p->specificity, callerid);
1035 new_find_extension("/", score, p->next_char, length+1, spec+p->specificity, callerid);
1037 } else if (p->next_char && !*(str+1)) {
1038 score->canmatch = 1;
1039 score->canmatch_exten = get_canmatch_exten(p);
1047 /* the algorithm for forming the extension pattern tree is also a bit simple; you
1048 * traverse all the extensions in a context, and for each char of the extension,
1049 * you see if it exists in the tree; if it doesn't, you add it at the appropriate
1050 * spot. What more can I say? At the end of the list, you cap it off by adding the
1051 * address of the extension involved. Duplicate patterns will be complained about.
1053 * Ideally, this would be done for each context after it is created and fully
1054 * filled. It could be done as a finishing step after extensions.conf or .ael is
1055 * loaded, or it could be done when the first search is encountered. It should only
1056 * have to be done once, until the next unload or reload.
1058 * I guess forming this pattern tree would be analogous to compiling a regex.
1061 static struct match_char *already_in_tree(struct match_char *current, char *pat)
1063 struct match_char *t;
1066 for (t=current; t; t=t->alt_char) {
1067 if (strcmp(pat,t->x) == 0) /* uh, we may want to sort exploded [] contents to make matching easy */
1073 static struct match_char *add_pattern_node(struct ast_context *con, struct match_char *current, char *pattern, int is_pattern, int already, int specificity)
1075 struct match_char *m = ast_calloc(1,sizeof(struct match_char));
1076 m->x = ast_strdup(pattern);
1077 m->is_pattern = is_pattern;
1078 if (specificity == 1 && is_pattern && pattern[0] == 'N')
1079 m->specificity = 98;
1080 else if (specificity == 1 && is_pattern && pattern[0] == 'Z')
1081 m->specificity = 99;
1082 else if (specificity == 1 && is_pattern && pattern[0] == 'X')
1083 m->specificity = 100;
1084 else if (specificity == 1 && is_pattern && pattern[0] == '.')
1085 m->specificity = 200;
1086 else if (specificity == 1 && is_pattern && pattern[0] == '!')
1087 m->specificity = 200;
1089 m->specificity = specificity;
1091 if (!con->pattern_tree) {
1092 con->pattern_tree = m;
1094 if (already) { /* switch to the new regime (traversing vs appending)*/
1095 m->alt_char = current->alt_char;
1096 current->alt_char = m;
1098 if (current->next_char) {
1099 m->alt_char = current->next_char->alt_char;
1100 current->next_char = m;
1102 current->next_char = m;
1109 static struct match_char *add_exten_to_pattern_tree(struct ast_context *con, struct ast_exten *e1, int findonly)
1111 struct match_char *m1=0,*m2=0;
1117 char *s1 = extenbuf;
1118 int l1 = strlen(e1->exten) + strlen(e1->cidmatch) + 2;
1121 strncpy(extenbuf,e1->exten,sizeof(extenbuf));
1122 if (e1->matchcid && l1 <= sizeof(extenbuf)) {
1123 strcat(extenbuf,"/");
1124 strcat(extenbuf,e1->cidmatch);
1125 } else if (l1 > sizeof(extenbuf)) {
1126 ast_log(LOG_ERROR,"The pattern %s/%s is too big to deal with: it will be ignored! Disaster!\n", e1->exten, e1->cidmatch);
1130 ast_log(LOG_DEBUG,"Adding exten %s%c%s to tree\n", s1, e1->matchcid? '/':' ', e1->matchcid? e1->cidmatch : "");
1132 m1 = con->pattern_tree; /* each pattern starts over at the root of the pattern tree */
1140 if (pattern && *s1 == '[' && *(s1-1) != '\\') {
1143 s1++; /* get past the '[' */
1144 while (*s1 != ']' && *(s1-1) != '\\' ) {
1146 if (*(s1+1) == ']') {
1149 } else if (*(s1+1) == '\\') {
1152 } else if (*(s1+1) == '-') {
1155 } else if (*(s1+1) == '[') {
1159 } else if (*s1 == '-') { /* remember to add some error checking to all this! */
1162 for (s3++; s3 <= s4; s3++) {
1170 *s2 = 0; /* null terminate the exploded range */
1171 specif = strlen(buf);
1179 if (*s1 == 'n') /* make sure n,x,z patterns are canonicalized to N,X,Z */
1181 else if (*s1 == 'x')
1183 else if (*s1 == 'z')
1192 if (already && (m2=already_in_tree(m1,buf)) && m2->next_char) {
1193 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...
1194 a shorter pattern might win if the longer one doesn't match */
1198 m1 = m2->next_char; /* m1 points to the node to compare against */
1207 m1 = add_pattern_node(con, m1, buf, pattern, already,specif); /* m1 is the node just added */
1217 s1++; /* advance to next char */
1222 static void create_match_char_tree(struct ast_context *con)
1224 struct ast_hashtab_iter *t1;
1225 struct ast_exten *e1;
1227 int biggest_bucket, resizes, numobjs, numbucks;
1229 ast_log(LOG_DEBUG,"Creating Extension Trie for context %s\n", con->name);
1230 ast_hashtab_get_stats(con->root_tree, &biggest_bucket, &resizes, &numobjs, &numbucks);
1231 ast_log(LOG_DEBUG,"This tree has %d objects in %d bucket lists, longest list=%d objects, and has resized %d times\n",
1232 numobjs, numbucks, biggest_bucket, resizes);
1234 t1 = ast_hashtab_start_traversal(con->root_tree);
1235 while( (e1 = ast_hashtab_next(t1)) ) {
1237 add_exten_to_pattern_tree(con, e1, 0);
1239 ast_log(LOG_ERROR,"Attempt to create extension with no extension name.\n");
1241 ast_hashtab_end_traversal(t1);
1244 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! */
1246 /* destroy all the alternates */
1247 if (pattern_tree->alt_char) {
1248 destroy_pattern_tree(pattern_tree->alt_char);
1249 pattern_tree->alt_char = 0;
1251 /* destroy all the nexts */
1252 if (pattern_tree->next_char) {
1253 destroy_pattern_tree(pattern_tree->next_char);
1254 pattern_tree->next_char = 0;
1256 pattern_tree->exten = 0; /* never hurts to make sure there's no pointers laying around */
1257 if (pattern_tree->x)
1258 free(pattern_tree->x);
1263 * Special characters used in patterns:
1264 * '_' underscore is the leading character of a pattern.
1265 * In other position it is treated as a regular char.
1266 * ' ' '-' space and '-' are separator and ignored.
1267 * . one or more of any character. Only allowed at the end of
1269 * ! zero or more of anything. Also impacts the result of CANMATCH
1270 * and MATCHMORE. Only allowed at the end of a pattern.
1271 * In the core routine, ! causes a match with a return code of 2.
1272 * In turn, depending on the search mode: (XXX check if it is implemented)
1273 * - E_MATCH retuns 1 (does match)
1274 * - E_MATCHMORE returns 0 (no match)
1275 * - E_CANMATCH returns 1 (does match)
1277 * / should not appear as it is considered the separator of the CID info.
1278 * XXX at the moment we may stop on this char.
1280 * X Z N match ranges 0-9, 1-9, 2-9 respectively.
1281 * [ denotes the start of a set of character. Everything inside
1282 * is considered literally. We can have ranges a-d and individual
1283 * characters. A '[' and '-' can be considered literally if they
1284 * are just before ']'.
1285 * XXX currently there is no way to specify ']' in a range, nor \ is
1286 * considered specially.
1288 * When we compare a pattern with a specific extension, all characters in the extension
1289 * itself are considered literally with the only exception of '-' which is considered
1290 * as a separator and thus ignored.
1291 * XXX do we want to consider space as a separator as well ?
1292 * XXX do we want to consider the separators in non-patterns as well ?
1296 * \brief helper functions to sort extensions and patterns in the desired way,
1297 * so that more specific patterns appear first.
1299 * ext_cmp1 compares individual characters (or sets of), returning
1300 * an int where bits 0-7 are the ASCII code of the first char in the set,
1301 * while bit 8-15 are the cardinality of the set minus 1.
1302 * This way more specific patterns (smaller cardinality) appear first.
1303 * Wildcards have a special value, so that we can directly compare them to
1304 * sets by subtracting the two values. In particular:
1305 * 0x000xx one character, xx
1306 * 0x0yyxx yy character set starting with xx
1307 * 0x10000 '.' (one or more of anything)
1308 * 0x20000 '!' (zero or more of anything)
1309 * 0x30000 NUL (end of string)
1310 * 0x40000 error in set.
1311 * The pointer to the string is advanced according to needs.
1313 * 1. the empty set is equivalent to NUL.
1314 * 2. given that a full set has always 0 as the first element,
1315 * we could encode the special cases as 0xffXX where XX
1316 * is 1, 2, 3, 4 as used above.
1318 static int ext_cmp1(const char **p)
1321 int c, cmin = 0xff, count = 0;
1324 /* load, sign extend and advance pointer until we find
1325 * a valid character.
1327 while ( (c = *(*p)++) && (c == ' ' || c == '-') )
1328 ; /* ignore some characters */
1330 /* always return unless we have a set of chars */
1332 default: /* ordinary character */
1333 return 0x0000 | (c & 0xff);
1335 case 'N': /* 2..9 */
1336 return 0x0700 | '2' ;
1338 case 'X': /* 0..9 */
1339 return 0x0900 | '0';
1341 case 'Z': /* 1..9 */
1342 return 0x0800 | '1';
1344 case '.': /* wildcard */
1347 case '!': /* earlymatch */
1348 return 0x20000; /* less specific than NULL */
1350 case '\0': /* empty string */
1354 case '[': /* pattern */
1357 /* locate end of set */
1358 end = strchr(*p, ']');
1361 ast_log(LOG_WARNING, "Wrong usage of [] in the extension\n");
1362 return 0x40000; /* XXX make this entry go last... */
1365 bzero(chars, sizeof(chars)); /* clear all chars in the set */
1366 for (; *p < end ; (*p)++) {
1367 unsigned char c1, c2; /* first-last char in range */
1368 c1 = (unsigned char)((*p)[0]);
1369 if (*p + 2 < end && (*p)[1] == '-') { /* this is a range */
1370 c2 = (unsigned char)((*p)[2]);
1371 *p += 2; /* skip a total of 3 chars */
1372 } else /* individual character */
1376 for (; c1 <= c2; c1++) {
1377 uint32_t mask = 1 << (c1 % 32);
1378 if ( (chars[ c1 / 32 ] & mask) == 0)
1380 chars[ c1 / 32 ] |= mask;
1384 return count == 0 ? 0x30000 : (count | cmin);
1388 * \brief the full routine to compare extensions in rules.
1390 static int ext_cmp(const char *a, const char *b)
1392 /* make sure non-patterns come first.
1393 * If a is not a pattern, it either comes first or
1394 * we use strcmp to compare the strings.
1399 return (b[0] == '_') ? -1 : strcmp(a, b);
1401 /* Now we know a is a pattern; if b is not, a comes first */
1404 #if 0 /* old mode for ext matching */
1405 return strcmp(a, b);
1407 /* ok we need full pattern sorting routine */
1408 while (!ret && a && b)
1409 ret = ext_cmp1(&a) - ext_cmp1(&b);
1413 return (ret > 0) ? 1 : -1;
1416 int ast_extension_cmp(const char *a, const char *b)
1418 return ext_cmp(a, b);
1423 * \brief used ast_extension_{match|close}
1424 * mode is as follows:
1425 * E_MATCH success only on exact match
1426 * E_MATCHMORE success only on partial match (i.e. leftover digits in pattern)
1427 * E_CANMATCH either of the above.
1428 * \retval 0 on no-match
1429 * \retval 1 on match
1430 * \retval 2 on early match.
1433 static int _extension_match_core(const char *pattern, const char *data, enum ext_match_t mode)
1435 mode &= E_MATCH_MASK; /* only consider the relevant bits */
1437 if ( (mode == E_MATCH) && (pattern[0] == '_') && (strcasecmp(pattern,data)==0) ) /* note: if this test is left out, then _x. will not match _x. !!! */
1440 if (pattern[0] != '_') { /* not a pattern, try exact or partial match */
1441 int ld = strlen(data), lp = strlen(pattern);
1443 if (lp < ld) /* pattern too short, cannot match */
1445 /* depending on the mode, accept full or partial match or both */
1446 if (mode == E_MATCH)
1447 return !strcmp(pattern, data); /* 1 on match, 0 on fail */
1448 if (ld == 0 || !strncasecmp(pattern, data, ld)) /* partial or full match */
1449 return (mode == E_MATCHMORE) ? lp > ld : 1; /* XXX should consider '!' and '/' ? */
1453 pattern++; /* skip leading _ */
1455 * XXX below we stop at '/' which is a separator for the CID info. However we should
1456 * not store '/' in the pattern at all. When we insure it, we can remove the checks.
1458 while (*data && *pattern && *pattern != '/') {
1461 if (*data == '-') { /* skip '-' in data (just a separator) */
1465 switch (toupper(*pattern)) {
1466 case '[': /* a range */
1467 end = strchr(pattern+1, ']'); /* XXX should deal with escapes ? */
1469 ast_log(LOG_WARNING, "Wrong usage of [] in the extension\n");
1470 return 0; /* unconditional failure */
1472 for (pattern++; pattern != end; pattern++) {
1473 if (pattern+2 < end && pattern[1] == '-') { /* this is a range */
1474 if (*data >= pattern[0] && *data <= pattern[2])
1475 break; /* match found */
1477 pattern += 2; /* skip a total of 3 chars */
1480 } else if (*data == pattern[0])
1481 break; /* match found */
1485 pattern = end; /* skip and continue */
1488 if (*data < '2' || *data > '9')
1492 if (*data < '0' || *data > '9')
1496 if (*data < '1' || *data > '9')
1499 case '.': /* Must match, even with more digits */
1501 case '!': /* Early match */
1504 case '-': /* Ignore these in patterns */
1505 data--; /* compensate the final data++ */
1508 if (*data != *pattern)
1514 if (*data) /* data longer than pattern, no match */
1517 * match so far, but ran off the end of the data.
1518 * Depending on what is next, determine match or not.
1520 if (*pattern == '\0' || *pattern == '/') /* exact match */
1521 return (mode == E_MATCHMORE) ? 0 : 1; /* this is a failure for E_MATCHMORE */
1522 else if (*pattern == '!') /* early match */
1524 else /* partial match */
1525 return (mode == E_MATCH) ? 0 : 1; /* this is a failure for E_MATCH */
1529 * Wrapper around _extension_match_core() to do performance measurement
1530 * using the profiling code.
1532 static int extension_match_core(const char *pattern, const char *data, enum ext_match_t mode)
1535 static int prof_id = -2; /* marker for 'unallocated' id */
1537 prof_id = ast_add_profile("ext_match", 0);
1538 ast_mark(prof_id, 1);
1539 i = _extension_match_core(pattern, data, mode);
1540 ast_mark(prof_id, 0);
1544 int ast_extension_match(const char *pattern, const char *data)
1546 return extension_match_core(pattern, data, E_MATCH);
1549 int ast_extension_close(const char *pattern, const char *data, int needmore)
1551 if (needmore != E_MATCHMORE && needmore != E_CANMATCH)
1552 ast_log(LOG_WARNING, "invalid argument %d\n", needmore);
1553 return extension_match_core(pattern, data, needmore);
1556 struct fake_context /* this struct is purely for matching in the hashtab */
1559 struct ast_exten *root;
1560 struct ast_hashtab *root_tree;
1561 struct match_char *pattern_tree;
1562 struct ast_context *next;
1563 struct ast_include *includes;
1564 struct ast_ignorepat *ignorepats;
1565 const char *registrar;
1566 AST_LIST_HEAD_NOLOCK(, ast_sw) alts;
1567 ast_mutex_t macrolock;
1571 struct ast_context *ast_context_find(const char *name)
1573 struct ast_context *tmp = NULL;
1574 struct fake_context item;
1575 strncpy(item.name,name,256);
1576 ast_rdlock_contexts();
1577 if( contexts_tree ) {
1578 tmp = ast_hashtab_lookup(contexts_tree,&item);
1580 while ( (tmp = ast_walk_contexts(tmp)) ) {
1581 if (!name || !strcasecmp(name, tmp->name))
1585 ast_unlock_contexts();
1589 #define STATUS_NO_CONTEXT 1
1590 #define STATUS_NO_EXTENSION 2
1591 #define STATUS_NO_PRIORITY 3
1592 #define STATUS_NO_LABEL 4
1593 #define STATUS_SUCCESS 5
1595 static int matchcid(const char *cidpattern, const char *callerid)
1597 /* If the Caller*ID pattern is empty, then we're matching NO Caller*ID, so
1598 failing to get a number should count as a match, otherwise not */
1600 if (ast_strlen_zero(callerid))
1601 return ast_strlen_zero(cidpattern) ? 1 : 0;
1603 return ast_extension_match(cidpattern, callerid);
1606 struct ast_exten *pbx_find_extension(struct ast_channel *chan,
1607 struct ast_context *bypass, struct pbx_find_info *q,
1608 const char *context, const char *exten, int priority,
1609 const char *label, const char *callerid, enum ext_match_t action)
1612 struct ast_context *tmp=0;
1613 struct ast_exten *e=0, *eroot=0;
1614 struct ast_include *i = 0;
1615 struct ast_sw *sw = 0;
1616 struct ast_exten pattern = {0};
1617 struct scoreboard score = {0};
1619 pattern.label = label;
1620 pattern.priority = priority;
1622 ast_log(LOG_NOTICE,"Looking for cont/ext/prio/label/action = %s/%s/%d/%s/%d\n", context, exten, priority, label, (int)action);
1624 /* Initialize status if appropriate */
1625 if (q->stacklen == 0) {
1626 q->status = STATUS_NO_CONTEXT;
1629 q->foundcontext = NULL;
1630 } else if (q->stacklen >= AST_PBX_MAX_STACK) {
1631 ast_log(LOG_WARNING, "Maximum PBX stack exceeded\n");
1635 /* Check first to see if we've already been checked */
1636 for (x = 0; x < q->stacklen; x++) {
1637 if (!strcasecmp(q->incstack[x], context))
1641 if (bypass) /* bypass means we only look there */
1643 else { /* look in contexts */
1644 struct fake_context item;
1645 strncpy(item.name,context,256);
1646 tmp = ast_hashtab_lookup(contexts_tree,&item);
1649 while ((tmp = ast_walk_contexts(tmp)) ) {
1650 if (!strcmp(tmp->name, context))
1659 if (q->status < STATUS_NO_EXTENSION)
1660 q->status = STATUS_NO_EXTENSION;
1662 /* Do a search for matching extension */
1665 score.total_specificity = 0;
1667 score.total_length = 0;
1668 if (!tmp->pattern_tree && tmp->root_tree)
1670 create_match_char_tree(tmp);
1672 ast_log(LOG_DEBUG,"Tree Created in context %s:\n", context);
1673 log_match_char_tree(tmp->pattern_tree," ");
1677 ast_log(LOG_NOTICE,"The Trie we are searching in:\n");
1678 log_match_char_tree(tmp->pattern_tree, ":: ");
1681 if (extenpatternmatchnew) {
1682 new_find_extension(exten, &score, tmp->pattern_tree, 0, 0, callerid);
1683 eroot = score.exten;
1685 if (score.last_char == '!' && action == E_MATCHMORE) {
1686 /* We match an extension ending in '!'.
1687 * The decision in this case is final and is NULL (no match).
1690 ast_log(LOG_NOTICE,"Returning MATCHMORE NULL with exclamation point.\n");
1695 if (!eroot && (action == E_CANMATCH || action == E_MATCHMORE) && score.canmatch_exten) {
1696 q->status = STATUS_SUCCESS;
1698 ast_log(LOG_NOTICE,"Returning CANMATCH exten %s\n", score.canmatch_exten->exten);
1700 return score.canmatch_exten;
1703 if ((action == E_MATCHMORE || action == E_CANMATCH) && eroot) {
1705 struct ast_exten *z = trie_find_next_match(score.node);
1708 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE next_match exten %s\n", z->exten);
1710 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE next_match exten NULL\n");
1715 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE NULL (no next_match)\n");
1717 return NULL; /* according to the code, complete matches are null matches in MATCHMORE mode */
1721 /* found entry, now look for the right priority */
1722 if (q->status < STATUS_NO_PRIORITY)
1723 q->status = STATUS_NO_PRIORITY;
1725 if (action == E_FINDLABEL && label ) {
1726 if (q->status < STATUS_NO_LABEL)
1727 q->status = STATUS_NO_LABEL;
1728 e = ast_hashtab_lookup(eroot->peer_label_tree, &pattern);
1730 e = ast_hashtab_lookup(eroot->peer_tree, &pattern);
1732 if (e) { /* found a valid match */
1733 q->status = STATUS_SUCCESS;
1734 q->foundcontext = context;
1736 ast_log(LOG_NOTICE,"Returning complete match of exten %s\n", e->exten);
1743 /* scan the list trying to match extension and CID */
1745 while ( (eroot = ast_walk_context_extensions(tmp, eroot)) ) {
1746 int match = extension_match_core(eroot->exten, exten, action);
1747 /* 0 on fail, 1 on match, 2 on earlymatch */
1749 if (!match || (eroot->matchcid && !matchcid(eroot->cidmatch, callerid)))
1750 continue; /* keep trying */
1751 if (match == 2 && action == E_MATCHMORE) {
1752 /* We match an extension ending in '!'.
1753 * The decision in this case is final and is NULL (no match).
1757 /* found entry, now look for the right priority */
1758 if (q->status < STATUS_NO_PRIORITY)
1759 q->status = STATUS_NO_PRIORITY;
1761 if (action == E_FINDLABEL && label ) {
1762 if (q->status < STATUS_NO_LABEL)
1763 q->status = STATUS_NO_LABEL;
1764 e = ast_hashtab_lookup(eroot->peer_label_tree, &pattern);
1766 e = ast_hashtab_lookup(eroot->peer_tree, &pattern);
1769 while ( (e = ast_walk_extension_priorities(eroot, e)) ) {
1770 /* Match label or priority */
1771 if (action == E_FINDLABEL) {
1772 if (q->status < STATUS_NO_LABEL)
1773 q->status = STATUS_NO_LABEL;
1774 if (label && e->label && !strcmp(label, e->label))
1775 break; /* found it */
1776 } else if (e->priority == priority) {
1777 break; /* found it */
1778 } /* else keep searching */
1781 if (e) { /* found a valid match */
1782 q->status = STATUS_SUCCESS;
1783 q->foundcontext = context;
1790 /* Check alternative switches */
1791 AST_LIST_TRAVERSE(&tmp->alts, sw, list) {
1792 struct ast_switch *asw = pbx_findswitch(sw->name);
1793 ast_switch_f *aswf = NULL;
1797 ast_log(LOG_WARNING, "No such switch '%s'\n", sw->name);
1800 /* Substitute variables now */
1803 pbx_substitute_variables_helper(chan, sw->data, sw->tmpdata, SWITCH_DATA_LENGTH - 1);
1805 /* equivalent of extension_match_core() at the switch level */
1806 if (action == E_CANMATCH)
1807 aswf = asw->canmatch;
1808 else if (action == E_MATCHMORE)
1809 aswf = asw->matchmore;
1810 else /* action == E_MATCH */
1812 datap = sw->eval ? sw->tmpdata : sw->data;
1817 ast_autoservice_start(chan);
1818 res = aswf(chan, context, exten, priority, callerid, datap);
1820 ast_autoservice_stop(chan);
1822 if (res) { /* Got a match */
1825 q->foundcontext = context;
1826 /* XXX keep status = STATUS_NO_CONTEXT ? */
1830 q->incstack[q->stacklen++] = tmp->name; /* Setup the stack */
1831 /* Now try any includes we have in this context */
1832 for (i = tmp->includes; i; i = i->next) {
1833 if (include_valid(i)) {
1834 if ((e = pbx_find_extension(chan, bypass, q, i->rname, exten, priority, label, callerid, action))) {
1836 ast_log(LOG_NOTICE,"Returning recursive match of %s\n", e->exten);
1848 * \brief extract offset:length from variable name.
1849 * \return 1 if there is a offset:length part, which is
1850 * trimmed off (values go into variables)
1852 static int parse_variable_name(char *var, int *offset, int *length, int *isfunc)
1859 for (; *var; var++) {
1863 } else if (*var == ')') {
1865 } else if (*var == ':' && parens == 0) {
1867 sscanf(var, "%d:%d", offset, length);
1868 return 1; /* offset:length valid */
1875 *\brief takes a substring. It is ok to call with value == workspace.
1877 * \param offset < 0 means start from the end of the string and set the beginning
1878 * to be that many characters back.
1879 * \param length is the length of the substring, a value less than 0 means to leave
1880 * that many off the end.
1882 * \param workspace_len
1883 * Always return a copy in workspace.
1885 static char *substring(const char *value, int offset, int length, char *workspace, size_t workspace_len)
1887 char *ret = workspace;
1888 int lr; /* length of the input string after the copy */
1890 ast_copy_string(workspace, value, workspace_len); /* always make a copy */
1892 lr = strlen(ret); /* compute length after copy, so we never go out of the workspace */
1894 /* Quick check if no need to do anything */
1895 if (offset == 0 && length >= lr) /* take the whole string */
1898 if (offset < 0) { /* translate negative offset into positive ones */
1899 offset = lr + offset;
1900 if (offset < 0) /* If the negative offset was greater than the length of the string, just start at the beginning */
1904 /* too large offset result in empty string so we know what to return */
1906 return ret + lr; /* the final '\0' */
1908 ret += offset; /* move to the start position */
1909 if (length >= 0 && length < lr - offset) /* truncate if necessary */
1911 else if (length < 0) {
1912 if (lr > offset - length) /* After we remove from the front and from the rear, is there anything left? */
1913 ret[lr + length - offset] = '\0';
1921 /*! \brief Support for Asterisk built-in variables in the dialplan
1924 - \ref AstVar Channel variables
1925 - \ref AstCauses The HANGUPCAUSE variable
1927 void pbx_retrieve_variable(struct ast_channel *c, const char *var, char **ret, char *workspace, int workspacelen, struct varshead *headp)
1929 const char not_found = '\0';
1931 const char *s; /* the result */
1933 int i, need_substring;
1934 struct varshead *places[2] = { headp, &globals }; /* list of places where we may look */
1937 ast_channel_lock(c);
1938 places[0] = &c->varshead;
1941 * Make a copy of var because parse_variable_name() modifies the string.
1942 * Then if called directly, we might need to run substring() on the result;
1943 * remember this for later in 'need_substring', 'offset' and 'length'
1945 tmpvar = ast_strdupa(var); /* parse_variable_name modifies the string */
1946 need_substring = parse_variable_name(tmpvar, &offset, &length, &i /* ignored */);
1949 * Look first into predefined variables, then into variable lists.
1950 * Variable 's' points to the result, according to the following rules:
1951 * s == ¬_found (set at the beginning) means that we did not find a
1952 * matching variable and need to look into more places.
1953 * If s != ¬_found, s is a valid result string as follows:
1954 * s = NULL if the variable does not have a value;
1955 * you typically do this when looking for an unset predefined variable.
1956 * s = workspace if the result has been assembled there;
1957 * typically done when the result is built e.g. with an snprintf(),
1958 * so we don't need to do an additional copy.
1959 * s != workspace in case we have a string, that needs to be copied
1960 * (the ast_copy_string is done once for all at the end).
1961 * Typically done when the result is already available in some string.
1963 s = ¬_found; /* default value */
1964 if (c) { /* This group requires a valid channel */
1965 /* Names with common parts are looked up a piece at a time using strncmp. */
1966 if (!strncmp(var, "CALL", 4)) {
1967 if (!strncmp(var + 4, "ING", 3)) {
1968 if (!strcmp(var + 7, "PRES")) { /* CALLINGPRES */
1969 snprintf(workspace, workspacelen, "%d", c->cid.cid_pres);
1971 } else if (!strcmp(var + 7, "ANI2")) { /* CALLINGANI2 */
1972 snprintf(workspace, workspacelen, "%d", c->cid.cid_ani2);
1974 } else if (!strcmp(var + 7, "TON")) { /* CALLINGTON */
1975 snprintf(workspace, workspacelen, "%d", c->cid.cid_ton);
1977 } else if (!strcmp(var + 7, "TNS")) { /* CALLINGTNS */
1978 snprintf(workspace, workspacelen, "%d", c->cid.cid_tns);
1982 } else if (!strcmp(var, "HINT")) {
1983 s = ast_get_hint(workspace, workspacelen, NULL, 0, c, c->context, c->exten) ? workspace : NULL;
1984 } else if (!strcmp(var, "HINTNAME")) {
1985 s = ast_get_hint(NULL, 0, workspace, workspacelen, c, c->context, c->exten) ? workspace : NULL;
1986 } else if (!strcmp(var, "EXTEN")) {
1988 } else if (!strcmp(var, "CONTEXT")) {
1990 } else if (!strcmp(var, "PRIORITY")) {
1991 snprintf(workspace, workspacelen, "%d", c->priority);
1993 } else if (!strcmp(var, "CHANNEL")) {
1995 } else if (!strcmp(var, "UNIQUEID")) {
1997 } else if (!strcmp(var, "HANGUPCAUSE")) {
1998 snprintf(workspace, workspacelen, "%d", c->hangupcause);
2002 if (s == ¬_found) { /* look for more */
2003 if (!strcmp(var, "EPOCH")) {
2004 snprintf(workspace, workspacelen, "%u",(int)time(NULL));
2006 } else if (!strcmp(var, "SYSTEMNAME")) {
2007 s = ast_config_AST_SYSTEM_NAME;
2010 /* if not found, look into chanvars or global vars */
2011 for (i = 0; s == ¬_found && i < (sizeof(places) / sizeof(places[0])); i++) {
2012 struct ast_var_t *variables;
2015 if (places[i] == &globals)
2016 ast_rwlock_rdlock(&globalslock);
2017 AST_LIST_TRAVERSE(places[i], variables, entries) {
2018 if (strcasecmp(ast_var_name(variables), var)==0) {
2019 s = ast_var_value(variables);
2023 if (places[i] == &globals)
2024 ast_rwlock_unlock(&globalslock);
2026 if (s == ¬_found || s == NULL)
2030 ast_copy_string(workspace, s, workspacelen);
2033 *ret = substring(*ret, offset, length, workspace, workspacelen);
2037 ast_channel_unlock(c);
2040 static void exception_store_free(void *data)
2042 struct pbx_exception *exception = data;
2043 ast_string_field_free_memory(exception);
2044 ast_free(exception);
2047 static struct ast_datastore_info exception_store_info = {
2048 .type = "EXCEPTION",
2049 .destroy = exception_store_free,
2052 int pbx_builtin_raise_exception(struct ast_channel *chan, void *vreason)
2054 const char *reason = vreason;
2055 struct ast_datastore *ds = ast_channel_datastore_find(chan, &exception_store_info, NULL);
2056 struct pbx_exception *exception = NULL;
2059 ds = ast_channel_datastore_alloc(&exception_store_info, NULL);
2062 exception = ast_calloc(1, sizeof(struct pbx_exception));
2064 ast_channel_datastore_free(ds);
2067 if (ast_string_field_init(exception, 128)) {
2068 ast_free(exception);
2069 ast_channel_datastore_free(ds);
2072 ds->data = exception;
2073 ast_channel_datastore_add(chan, ds);
2075 exception = ds->data;
2077 ast_string_field_set(exception, reason, reason);
2078 ast_string_field_set(exception, context, chan->context);
2079 ast_string_field_set(exception, exten, chan->exten);
2080 exception->priority = chan->priority;
2081 set_ext_pri(chan, "e", 0);
2085 static int acf_exception_read(struct ast_channel *chan, const char *name, char *data, char *buf, size_t buflen)
2087 struct ast_datastore *ds = ast_channel_datastore_find(chan, &exception_store_info, NULL);
2088 struct pbx_exception *exception = NULL;
2089 if (!ds || !ds->data)
2091 exception = ds->data;
2092 if (!strcasecmp(data, "REASON"))
2093 ast_copy_string(buf, exception->reason, buflen);
2094 else if (!strcasecmp(data, "CONTEXT"))
2095 ast_copy_string(buf, exception->context, buflen);
2096 else if (!strncasecmp(data, "EXTEN", 5))
2097 ast_copy_string(buf, exception->exten, buflen);
2098 else if (!strcasecmp(data, "PRIORITY"))
2099 snprintf(buf, buflen, "%d", exception->priority);
2105 static struct ast_custom_function exception_function = {
2106 .name = "EXCEPTION",
2107 .synopsis = "Retrieve the details of the current dialplan exception",
2109 "The following fields are available for retrieval:\n"
2110 " reason INVALID, ERROR, RESPONSETIMEOUT, ABSOLUTETIMEOUT, or custom\n"
2111 " value set by the RaiseException() application\n"
2112 " context The context executing when the exception occurred\n"
2113 " exten The extension executing when the exception occurred\n"
2114 " priority The numeric priority executing when the exception occurred\n",
2115 .syntax = "EXCEPTION(<field>)",
2116 .read = acf_exception_read,
2119 static char *handle_show_functions(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
2121 struct ast_custom_function *acf;
2127 e->command = "core show functions [like]";
2129 "Usage: core show functions [like <text>]\n"
2130 " List builtin functions, optionally only those matching a given string\n";
2136 if (a->argc == 5 && (!strcmp(a->argv[3], "like")) ) {
2138 } else if (a->argc != 3) {
2139 return CLI_SHOWUSAGE;
2142 ast_cli(a->fd, "%s Custom Functions:\n--------------------------------------------------------------------------------\n", like ? "Matching" : "Installed");
2144 AST_RWLIST_RDLOCK(&acf_root);
2145 AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
2146 if (!like || strstr(acf->name, a->argv[4])) {
2148 ast_cli(a->fd, "%-20.20s %-35.35s %s\n", acf->name, acf->syntax, acf->synopsis);
2151 AST_RWLIST_UNLOCK(&acf_root);
2153 ast_cli(a->fd, "%d %scustom functions installed.\n", count_acf, like ? "matching " : "");
2158 static char *handle_show_function(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
2160 struct ast_custom_function *acf;
2161 /* Maximum number of characters added by terminal coloring is 22 */
2162 char infotitle[64 + AST_MAX_APP + 22], syntitle[40], destitle[40];
2163 char info[64 + AST_MAX_APP], *synopsis = NULL, *description = NULL;
2164 char stxtitle[40], *syntax = NULL;
2165 int synopsis_size, description_size, syntax_size;
2172 e->command = "core show function";
2174 "Usage: core show function <function>\n"
2175 " Describe a particular dialplan function.\n";
2178 wordlen = strlen(a->word);
2179 /* case-insensitive for convenience in this 'complete' function */
2180 AST_RWLIST_RDLOCK(&acf_root);
2181 AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
2182 if (!strncasecmp(a->word, acf->name, wordlen) && ++which > a->n) {
2183 ret = ast_strdup(acf->name);
2187 AST_RWLIST_UNLOCK(&acf_root);
2193 return CLI_SHOWUSAGE;
2195 if (!(acf = ast_custom_function_find(a->argv[3]))) {
2196 ast_cli(a->fd, "No function by that name registered.\n");
2202 synopsis_size = strlen(acf->synopsis) + 23;
2204 synopsis_size = strlen("Not available") + 23;
2205 synopsis = alloca(synopsis_size);
2208 description_size = strlen(acf->desc) + 23;
2210 description_size = strlen("Not available") + 23;
2211 description = alloca(description_size);
2214 syntax_size = strlen(acf->syntax) + 23;
2216 syntax_size = strlen("Not available") + 23;
2217 syntax = alloca(syntax_size);
2219 snprintf(info, 64 + AST_MAX_APP, "\n -= Info about function '%s' =- \n\n", acf->name);
2220 term_color(infotitle, info, COLOR_MAGENTA, 0, 64 + AST_MAX_APP + 22);
2221 term_color(stxtitle, "[Syntax]\n", COLOR_MAGENTA, 0, 40);
2222 term_color(syntitle, "[Synopsis]\n", COLOR_MAGENTA, 0, 40);
2223 term_color(destitle, "[Description]\n", COLOR_MAGENTA, 0, 40);
2225 acf->syntax ? acf->syntax : "Not available",
2226 COLOR_CYAN, 0, syntax_size);
2227 term_color(synopsis,
2228 acf->synopsis ? acf->synopsis : "Not available",
2229 COLOR_CYAN, 0, synopsis_size);
2230 term_color(description,
2231 acf->desc ? acf->desc : "Not available",
2232 COLOR_CYAN, 0, description_size);
2234 ast_cli(a->fd,"%s%s%s\n\n%s%s\n\n%s%s\n", infotitle, stxtitle, syntax, syntitle, synopsis, destitle, description);
2239 struct ast_custom_function *ast_custom_function_find(const char *name)
2241 struct ast_custom_function *acf = NULL;
2243 AST_RWLIST_RDLOCK(&acf_root);
2244 AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
2245 if (!strcmp(name, acf->name))
2248 AST_RWLIST_UNLOCK(&acf_root);
2253 int ast_custom_function_unregister(struct ast_custom_function *acf)
2255 struct ast_custom_function *cur;
2260 AST_RWLIST_WRLOCK(&acf_root);
2261 if ((cur = AST_RWLIST_REMOVE(&acf_root, acf, acflist)))
2262 ast_verb(2, "Unregistered custom function %s\n", cur->name);
2263 AST_RWLIST_UNLOCK(&acf_root);
2265 return cur ? 0 : -1;
2268 int __ast_custom_function_register(struct ast_custom_function *acf, struct ast_module *mod)
2270 struct ast_custom_function *cur;
2277 AST_RWLIST_WRLOCK(&acf_root);
2279 AST_RWLIST_TRAVERSE(&acf_root, cur, acflist) {
2280 if (!strcmp(acf->name, cur->name)) {
2281 ast_log(LOG_ERROR, "Function %s already registered.\n", acf->name);
2282 AST_RWLIST_UNLOCK(&acf_root);
2287 /* Store in alphabetical order */
2288 AST_RWLIST_TRAVERSE_SAFE_BEGIN(&acf_root, cur, acflist) {
2289 if (strcasecmp(acf->name, cur->name) < 0) {
2290 AST_RWLIST_INSERT_BEFORE_CURRENT(acf, acflist);
2294 AST_RWLIST_TRAVERSE_SAFE_END;
2296 AST_RWLIST_INSERT_TAIL(&acf_root, acf, acflist);
2298 AST_RWLIST_UNLOCK(&acf_root);
2300 ast_verb(2, "Registered custom function %s\n", acf->name);
2305 /*! \brief return a pointer to the arguments of the function,
2306 * and terminates the function name with '\\0'
2308 static char *func_args(char *function)
2310 char *args = strchr(function, '(');
2313 ast_log(LOG_WARNING, "Function doesn't contain parentheses. Assuming null argument.\n");
2317 if ((p = strrchr(args, ')')) )
2320 ast_log(LOG_WARNING, "Can't find trailing parenthesis?\n");
2325 int ast_func_read(struct ast_channel *chan, const char *function, char *workspace, size_t len)
2327 char *copy = ast_strdupa(function);
2328 char *args = func_args(copy);
2329 struct ast_custom_function *acfptr = ast_custom_function_find(copy);
2332 ast_log(LOG_ERROR, "Function %s not registered\n", copy);
2333 else if (!acfptr->read)
2334 ast_log(LOG_ERROR, "Function %s cannot be read\n", copy);
2337 struct ast_module_user *u = NULL;
2339 u = __ast_module_user_add(acfptr->mod, chan);
2340 res = acfptr->read(chan, copy, args, workspace, len);
2341 if (acfptr->mod && u)
2342 __ast_module_user_remove(acfptr->mod, u);
2348 int ast_func_write(struct ast_channel *chan, const char *function, const char *value)
2350 char *copy = ast_strdupa(function);
2351 char *args = func_args(copy);
2352 struct ast_custom_function *acfptr = ast_custom_function_find(copy);
2355 ast_log(LOG_ERROR, "Function %s not registered\n", copy);
2356 else if (!acfptr->write)
2357 ast_log(LOG_ERROR, "Function %s cannot be written to\n", copy);
2360 struct ast_module_user *u = NULL;
2362 u = __ast_module_user_add(acfptr->mod, chan);
2363 res = acfptr->write(chan, copy, args, value);
2364 if (acfptr->mod && u)
2365 __ast_module_user_remove(acfptr->mod, u);
2372 static void pbx_substitute_variables_helper_full(struct ast_channel *c, struct varshead *headp, const char *cp1, char *cp2, int count)
2374 /* Substitutes variables into cp2, based on string cp1, cp2 NO LONGER NEEDS TO BE ZEROED OUT!!!! */
2376 const char *tmp, *whereweare;
2377 int length, offset, offset2, isfunction;
2378 char *workspace = NULL;
2379 char *ltmp = NULL, *var = NULL;
2380 char *nextvar, *nextexp, *nextthing;
2382 int pos, brackets, needsub, len;
2384 *cp2 = 0; /* just in case nothing ends up there */
2386 while (!ast_strlen_zero(whereweare) && count) {
2387 /* Assume we're copying the whole remaining string */
2388 pos = strlen(whereweare);
2391 nextthing = strchr(whereweare, '$');
2393 switch (nextthing[1]) {
2395 nextvar = nextthing;
2396 pos = nextvar - whereweare;
2399 nextexp = nextthing;
2400 pos = nextexp - whereweare;
2408 /* Can't copy more than 'count' bytes */
2412 /* Copy that many bytes */
2413 memcpy(cp2, whereweare, pos);
2422 /* We have a variable. Find the start and end, and determine
2423 if we are going to have to recursively call ourselves on the
2425 vars = vare = nextvar + 2;
2429 /* Find the end of it */
2430 while (brackets && *vare) {
2431 if ((vare[0] == '$') && (vare[1] == '{')) {
2433 } else if (vare[0] == '{') {
2435 } else if (vare[0] == '}') {
2437 } else if ((vare[0] == '$') && (vare[1] == '['))
2442 ast_log(LOG_NOTICE, "Error in extension logic (missing '}')\n");
2443 len = vare - vars - 1;
2445 /* Skip totally over variable string */
2446 whereweare += (len + 3);
2449 var = alloca(VAR_BUF_SIZE);
2451 /* Store variable name (and truncate) */
2452 ast_copy_string(var, vars, len + 1);
2454 /* Substitute if necessary */
2457 ltmp = alloca(VAR_BUF_SIZE);
2459 pbx_substitute_variables_helper_full(c, headp, var, ltmp, VAR_BUF_SIZE - 1);
2466 workspace = alloca(VAR_BUF_SIZE);
2468 workspace[0] = '\0';
2470 parse_variable_name(vars, &offset, &offset2, &isfunction);
2472 /* Evaluate function */
2474 cp4 = ast_func_read(c, vars, workspace, VAR_BUF_SIZE) ? NULL : workspace;
2476 struct varshead old;
2477 struct ast_channel *c = ast_channel_alloc(0, 0, "", "", "", "", "", 0, "Bogus/%p", vars);
2479 memcpy(&old, &c->varshead, sizeof(old));
2480 memcpy(&c->varshead, headp, sizeof(c->varshead));
2481 cp4 = ast_func_read(c, vars, workspace, VAR_BUF_SIZE) ? NULL : workspace;
2482 /* Don't deallocate the varshead that was passed in */
2483 memcpy(&c->varshead, &old, sizeof(c->varshead));
2484 ast_channel_free(c);
2486 ast_log(LOG_ERROR, "Unable to allocate bogus channel for variable substitution. Function results may be blank.\n");
2488 ast_debug(1, "Function result is '%s'\n", cp4 ? cp4 : "(null)");
2490 /* Retrieve variable value */
2491 pbx_retrieve_variable(c, vars, &cp4, workspace, VAR_BUF_SIZE, headp);
2494 cp4 = substring(cp4, offset, offset2, workspace, VAR_BUF_SIZE);
2496 length = strlen(cp4);
2499 memcpy(cp2, cp4, length);
2504 } else if (nextexp) {
2505 /* We have an expression. Find the start and end, and determine
2506 if we are going to have to recursively call ourselves on the
2508 vars = vare = nextexp + 2;
2512 /* Find the end of it */
2513 while (brackets && *vare) {
2514 if ((vare[0] == '$') && (vare[1] == '[')) {
2518 } else if (vare[0] == '[') {
2520 } else if (vare[0] == ']') {
2522 } else if ((vare[0] == '$') && (vare[1] == '{')) {
2529 ast_log(LOG_NOTICE, "Error in extension logic (missing ']')\n");
2530 len = vare - vars - 1;
2532 /* Skip totally over expression */
2533 whereweare += (len + 3);
2536 var = alloca(VAR_BUF_SIZE);
2538 /* Store variable name (and truncate) */
2539 ast_copy_string(var, vars, len + 1);
2541 /* Substitute if necessary */
2544 ltmp = alloca(VAR_BUF_SIZE);
2546 pbx_substitute_variables_helper_full(c, headp, var, ltmp, VAR_BUF_SIZE - 1);
2552 length = ast_expr(vars, cp2, count, c);
2555 ast_debug(1, "Expression result is '%s'\n", cp2);
2564 void pbx_substitute_variables_helper(struct ast_channel *c, const char *cp1, char *cp2, int count)
2566 pbx_substitute_variables_helper_full(c, (c) ? &c->varshead : NULL, cp1, cp2, count);
2569 void pbx_substitute_variables_varshead(struct varshead *headp, const char *cp1, char *cp2, int count)
2571 pbx_substitute_variables_helper_full(NULL, headp, cp1, cp2, count);
2574 static void pbx_substitute_variables(char *passdata, int datalen, struct ast_channel *c, struct ast_exten *e)
2578 /* Nothing more to do */
2582 /* No variables or expressions in e->data, so why scan it? */
2583 if ((!(tmp = strchr(e->data, '$'))) || (!strstr(tmp, "${") && !strstr(tmp, "$["))) {
2584 ast_copy_string(passdata, e->data, datalen);
2588 pbx_substitute_variables_helper(c, e->data, passdata, datalen - 1);
2592 * \brief The return value depends on the action:
2594 * E_MATCH, E_CANMATCH, E_MATCHMORE require a real match,
2595 * and return 0 on failure, -1 on match;
2596 * E_FINDLABEL maps the label to a priority, and returns
2597 * the priority on success, ... XXX
2598 * E_SPAWN, spawn an application,
2600 * \retval 0 on success.
2601 * \retval -1 on failure.
2603 * \note The channel is auto-serviced in this function, because doing an extension
2604 * match may block for a long time. For example, if the lookup has to use a network
2605 * dialplan switch, such as DUNDi or IAX2, it may take a while. However, the channel
2606 * auto-service code will queue up any important signalling frames to be processed
2607 * after this is done.
2609 static int pbx_extension_helper(struct ast_channel *c, struct ast_context *con,
2610 const char *context, const char *exten, int priority,
2611 const char *label, const char *callerid, enum ext_match_t action, int *found, int combined_find_spawn)
2613 struct ast_exten *e;
2614 struct ast_app *app;
2616 struct pbx_find_info q = { .stacklen = 0 }; /* the rest is reset in pbx_find_extension */
2617 char passdata[EXT_DATA_SIZE];
2619 int matching_action = (action == E_MATCH || action == E_CANMATCH || action == E_MATCHMORE);
2621 ast_rdlock_contexts();
2625 e = pbx_find_extension(c, con, &q, context, exten, priority, label, callerid, action);
2629 if (matching_action) {
2630 ast_unlock_contexts();
2631 return -1; /* success, we found it */
2632 } else if (action == E_FINDLABEL) { /* map the label to a priority */
2634 ast_unlock_contexts();
2635 return res; /* the priority we were looking for */
2636 } else { /* spawn */
2638 e->cached_app = pbx_findapp(e->app);
2639 app = e->cached_app;
2640 ast_unlock_contexts();
2642 ast_log(LOG_WARNING, "No application '%s' for extension (%s, %s, %d)\n", e->app, context, exten, priority);
2645 if (c->context != context)
2646 ast_copy_string(c->context, context, sizeof(c->context));
2647 if (c->exten != exten)
2648 ast_copy_string(c->exten, exten, sizeof(c->exten));
2649 c->priority = priority;
2650 pbx_substitute_variables(passdata, sizeof(passdata), c, e);
2651 ast_debug(1, "Launching '%s'\n", app->name);
2652 if (VERBOSITY_ATLEAST(3)) {
2653 char tmp[80], tmp2[80], tmp3[EXT_DATA_SIZE];
2654 ast_verb(3, "Executing [%s@%s:%d] %s(\"%s\", \"%s\") %s\n",
2655 exten, context, priority,
2656 term_color(tmp, app->name, COLOR_BRCYAN, 0, sizeof(tmp)),
2657 term_color(tmp2, c->name, COLOR_BRMAGENTA, 0, sizeof(tmp2)),
2658 term_color(tmp3, passdata, COLOR_BRMAGENTA, 0, sizeof(tmp3)),
2661 manager_event(EVENT_FLAG_CALL, "Newexten",
2666 "Application: %s\r\n"
2669 c->name, c->context, c->exten, c->priority, app->name, passdata, c->uniqueid);
2670 return pbx_exec(c, app, passdata); /* 0 on success, -1 on failure */
2672 } else if (q.swo) { /* not found here, but in another switch */
2673 ast_unlock_contexts();
2674 if (matching_action) {
2678 ast_log(LOG_WARNING, "No execution engine for switch %s\n", q.swo->name);
2681 return q.swo->exec(c, q.foundcontext ? q.foundcontext : context, exten, priority, callerid, q.data);
2683 } else { /* not found anywhere, see what happened */
2684 ast_unlock_contexts();
2686 case STATUS_NO_CONTEXT:
2687 if (!matching_action && !combined_find_spawn)
2688 ast_log(LOG_NOTICE, "Cannot find extension context '%s'\n", context);
2690 case STATUS_NO_EXTENSION:
2691 if (!matching_action && !combined_find_spawn)
2692 ast_log(LOG_NOTICE, "Cannot find extension '%s' in context '%s'\n", exten, context);
2694 case STATUS_NO_PRIORITY:
2695 if (!matching_action && !combined_find_spawn)
2696 ast_log(LOG_NOTICE, "No such priority %d in extension '%s' in context '%s'\n", priority, exten, context);
2698 case STATUS_NO_LABEL:
2699 if (context && !combined_find_spawn)
2700 ast_log(LOG_NOTICE, "No such label '%s' in extension '%s' in context '%s'\n", label, exten, context);
2703 ast_debug(1, "Shouldn't happen!\n");
2706 return (matching_action) ? 0 : -1;
2710 /*! \brief Find hint for given extension in context */
2711 static struct ast_exten *ast_hint_extension(struct ast_channel *c, const char *context, const char *exten)
2713 struct ast_exten *e;
2714 struct pbx_find_info q = { .stacklen = 0 }; /* the rest is set in pbx_find_context */
2716 ast_rdlock_contexts();
2717 e = pbx_find_extension(c, NULL, &q, context, exten, PRIORITY_HINT, NULL, "", E_MATCH);
2718 ast_unlock_contexts();
2723 /*! \brief Check state of extension by using hints */
2724 static int ast_extension_state2(struct ast_exten *e)
2726 char hint[AST_MAX_EXTENSION];
2728 int allunavailable = 1, allbusy = 1, allfree = 1, allonhold = 1;
2729 int busy = 0, inuse = 0, ring = 0;
2734 ast_copy_string(hint, ast_get_extension_app(e), sizeof(hint));
2736 rest = hint; /* One or more devices separated with a & character */
2737 while ( (cur = strsep(&rest, "&")) ) {
2738 int res = ast_device_state(cur);
2740 case AST_DEVICE_NOT_INUSE:
2745 case AST_DEVICE_INUSE:
2751 case AST_DEVICE_RINGING:
2757 case AST_DEVICE_RINGINUSE:
2764 case AST_DEVICE_ONHOLD:
2768 case AST_DEVICE_BUSY:
2774 case AST_DEVICE_UNAVAILABLE:
2775 case AST_DEVICE_INVALID:
2789 return AST_EXTENSION_RINGING;
2791 return (AST_EXTENSION_INUSE | AST_EXTENSION_RINGING);
2793 return AST_EXTENSION_INUSE;
2795 return AST_EXTENSION_NOT_INUSE;
2797 return AST_EXTENSION_ONHOLD;
2799 return AST_EXTENSION_BUSY;
2801 return AST_EXTENSION_UNAVAILABLE;
2803 return AST_EXTENSION_INUSE;
2805 return AST_EXTENSION_NOT_INUSE;
2808 /*! \brief Return extension_state as string */
2809 const char *ast_extension_state2str(int extension_state)
2813 for (i = 0; (i < (sizeof(extension_states) / sizeof(extension_states[0]))); i++) {
2814 if (extension_states[i].extension_state == extension_state)
2815 return extension_states[i].text;
2820 /*! \brief Check extension state for an extension by using hint */
2821 int ast_extension_state(struct ast_channel *c, const char *context, const char *exten)
2823 struct ast_exten *e;
2825 e = ast_hint_extension(c, context, exten); /* Do we have a hint for this extension ? */
2827 return -1; /* No hint, return -1 */
2829 return ast_extension_state2(e); /* Check all devices in the hint */
2832 static void handle_statechange(const char *device)
2834 struct ast_hint *hint;
2836 AST_RWLIST_RDLOCK(&hints);
2838 AST_RWLIST_TRAVERSE(&hints, hint, list) {
2839 struct ast_state_cb *cblist;
2840 char buf[AST_MAX_EXTENSION];
2845 ast_copy_string(buf, ast_get_extension_app(hint->exten), sizeof(buf));
2846 while ( (cur = strsep(&parse, "&")) ) {
2847 if (!strcasecmp(cur, device))
2853 /* Get device state for this hint */
2854 state = ast_extension_state2(hint->exten);
2856 if ((state == -1) || (state == hint->laststate))
2859 /* Device state changed since last check - notify the watchers */
2861 /* For general callbacks */
2862 for (cblist = statecbs; cblist; cblist = cblist->next)
2863 cblist->callback(hint->exten->parent->name, hint->exten->exten, state, cblist->data);
2865 /* For extension callbacks */
2866 for (cblist = hint->callbacks; cblist; cblist = cblist->next)
2867 cblist->callback(hint->exten->parent->name, hint->exten->exten, state, cblist->data);
2869 hint->laststate = state; /* record we saw the change */
2872 AST_RWLIST_UNLOCK(&hints);
2875 static int statechange_queue(const char *dev)
2877 struct statechange *sc;
2879 if (!(sc = ast_calloc(1, sizeof(*sc) + strlen(dev) + 1)))
2882 strcpy(sc->dev, dev);
2884 ast_mutex_lock(&device_state.lock);
2885 AST_LIST_INSERT_TAIL(&device_state.state_change_q, sc, entry);
2886 ast_cond_signal(&device_state.cond);
2887 ast_mutex_unlock(&device_state.lock);
2892 static void *device_state_thread(void *data)
2894 struct statechange *sc;
2896 while (!device_state.stop) {
2897 ast_mutex_lock(&device_state.lock);
2898 while (!(sc = AST_LIST_REMOVE_HEAD(&device_state.state_change_q, entry))) {
2899 ast_cond_wait(&device_state.cond, &device_state.lock);
2900 /* Check to see if we were woken up to see the request to stop */
2901 if (device_state.stop) {
2902 ast_mutex_unlock(&device_state.lock);
2906 ast_mutex_unlock(&device_state.lock);
2908 handle_statechange(sc->dev);
2916 /*! \brief Add watcher for extension states */
2917 int ast_extension_state_add(const char *context, const char *exten,
2918 ast_state_cb_type callback, void *data)
2920 struct ast_hint *hint;
2921 struct ast_state_cb *cblist;
2922 struct ast_exten *e;
2924 /* If there's no context and extension: add callback to statecbs list */
2925 if (!context && !exten) {
2926 AST_RWLIST_WRLOCK(&hints);
2928 for (cblist = statecbs; cblist; cblist = cblist->next) {
2929 if (cblist->callback == callback) {
2930 cblist->data = data;
2931 AST_RWLIST_UNLOCK(&hints);
2936 /* Now insert the callback */
2937 if (!(cblist = ast_calloc(1, sizeof(*cblist)))) {
2938 AST_RWLIST_UNLOCK(&hints);
2942 cblist->callback = callback;
2943 cblist->data = data;
2945 cblist->next = statecbs;
2948 AST_RWLIST_UNLOCK(&hints);
2952 if (!context || !exten)
2955 /* This callback type is for only one hint, so get the hint */
2956 e = ast_hint_extension(NULL, context, exten);
2961 /* Find the hint in the list of hints */
2962 AST_RWLIST_WRLOCK(&hints);
2964 AST_RWLIST_TRAVERSE(&hints, hint, list) {
2965 if (hint->exten == e)
2970 /* We have no hint, sorry */
2971 AST_RWLIST_UNLOCK(&hints);
2975 /* Now insert the callback in the callback list */
2976 if (!(cblist = ast_calloc(1, sizeof(*cblist)))) {
2977 AST_RWLIST_UNLOCK(&hints);
2980 cblist->id = stateid++; /* Unique ID for this callback */
2981 cblist->callback = callback; /* Pointer to callback routine */
2982 cblist->data = data; /* Data for the callback */
2984 cblist->next = hint->callbacks;
2985 hint->callbacks = cblist;
2987 AST_RWLIST_UNLOCK(&hints);
2991 /*! \brief Remove a watcher from the callback list */
2992 int ast_extension_state_del(int id, ast_state_cb_type callback)
2994 struct ast_state_cb **p_cur = NULL; /* address of pointer to us */
2997 if (!id && !callback)
3000 AST_RWLIST_WRLOCK(&hints);
3002 if (!id) { /* id == 0 is a callback without extension */
3003 for (p_cur = &statecbs; *p_cur; p_cur = &(*p_cur)->next) {
3004 if ((*p_cur)->callback == callback)
3007 } else { /* callback with extension, find the callback based on ID */
3008 struct ast_hint *hint;
3009 AST_RWLIST_TRAVERSE(&hints, hint, list) {
3010 for (p_cur = &hint->callbacks; *p_cur; p_cur = &(*p_cur)->next) {
3011 if ((*p_cur)->id == id)
3014 if (*p_cur) /* found in the inner loop */
3018 if (p_cur && *p_cur) {
3019 struct ast_state_cb *cur = *p_cur;
3024 AST_RWLIST_UNLOCK(&hints);
3028 /*! \brief Add hint to hint list, check initial extension state */
3029 static int ast_add_hint(struct ast_exten *e)
3031 struct ast_hint *hint;
3036 AST_RWLIST_WRLOCK(&hints);
3038 /* Search if hint exists, do nothing */
3039 AST_RWLIST_TRAVERSE(&hints, hint, list) {
3040 if (hint->exten == e) {
3041 AST_RWLIST_UNLOCK(&hints);
3042 ast_debug(2, "HINTS: Not re-adding existing hint %s: %s\n", ast_get_extension_name(e), ast_get_extension_app(e));
3047 ast_debug(2, "HINTS: Adding hint %s: %s\n", ast_get_extension_name(e), ast_get_extension_app(e));
3049 if (!(hint = ast_calloc(1, sizeof(*hint)))) {
3050 AST_RWLIST_UNLOCK(&hints);
3053 /* Initialize and insert new item at the top */
3055 hint->laststate = ast_extension_state2(e);
3056 AST_RWLIST_INSERT_HEAD(&hints, hint, list);
3058 AST_RWLIST_UNLOCK(&hints);
3062 /*! \brief Change hint for an extension */
3063 static int ast_change_hint(struct ast_exten *oe, struct ast_exten *ne)
3065 struct ast_hint *hint;
3068 AST_RWLIST_WRLOCK(&hints);
3069 AST_RWLIST_TRAVERSE(&hints, hint, list) {
3070 if (hint->exten == oe) {
3076 AST_RWLIST_UNLOCK(&hints);
3081 /*! \brief Remove hint from extension */
3082 static int ast_remove_hint(struct ast_exten *e)
3084 /* Cleanup the Notifys if hint is removed */
3085 struct ast_hint *hint;
3086 struct ast_state_cb *cblist, *cbprev;
3092 AST_RWLIST_TRAVERSE_SAFE_BEGIN(&hints, hint, list) {
3093 if (hint->exten == e) {
3095 cblist = hint->callbacks;
3097 /* Notify with -1 and remove all callbacks */
3099 cblist = cblist->next;
3100 cbprev->callback(hint->exten->parent->name, hint->exten->exten, AST_EXTENSION_DEACTIVATED, cbprev->data);
3103 hint->callbacks = NULL;
3104 AST_RWLIST_REMOVE_CURRENT(list);
3110 AST_RWLIST_TRAVERSE_SAFE_END;
3116 /*! \brief Get hint for channel */
3117 int ast_get_hint(char *hint, int hintsize, char *name, int namesize, struct ast_channel *c, const char *context, const char *exten)
3119 struct ast_exten *e = ast_hint_extension(c, context, exten);
3123 ast_copy_string(hint, ast_get_extension_app(e), hintsize);
3125 const char *tmp = ast_get_extension_app_data(e);
3127 ast_copy_string(name, tmp, namesize);
3134 int ast_exists_extension(struct ast_channel *c, const char *context, const char *exten, int priority, const char *callerid)
3136 return pbx_extension_helper(c, NULL, context, exten, priority, NULL, callerid, E_MATCH, 0, 0);
3139 int ast_findlabel_extension(struct ast_channel *c, const char *context, const char *exten, const char *label, const char *callerid)
3141 return pbx_extension_helper(c, NULL, context, exten, 0, label, callerid, E_FINDLABEL, 0, 0);
3144 int ast_findlabel_extension2(struct ast_channel *c, struct ast_context *con, const char *exten, const char *label, const char *callerid)
3146 return pbx_extension_helper(c, con, NULL, exten, 0, label, callerid, E_FINDLABEL, 0, 0);
3149 int ast_canmatch_extension(struct ast_channel *c, const char *context, const char *exten, int priority, const char *callerid)
3151 return pbx_extension_helper(c, NULL, context, exten, priority, NULL, callerid, E_CANMATCH, 0, 0);
3154 int ast_matchmore_extension(struct ast_channel *c, const char *context, const char *exten, int priority, const char *callerid)
3156 return pbx_extension_helper(c, NULL, context, exten, priority, NULL, callerid, E_MATCHMORE, 0, 0);
3159 int ast_spawn_extension(struct ast_channel *c, const char *context, const char *exten, int priority, const char *callerid, int *found, int combined_find_spawn)
3161 return pbx_extension_helper(c, NULL, context, exten, priority, NULL, callerid, E_SPAWN, found, combined_find_spawn);
3164 /*! helper function to set extension and priority */
3165 static void set_ext_pri(struct ast_channel *c, const char *exten, int pri)
3167 ast_channel_lock(c);
3168 ast_copy_string(c->exten, exten, sizeof(c->exten));
3170 ast_channel_unlock(c);
3174 * \brief collect digits from the channel into the buffer.
3175 * \retval 0 on timeout or done.
3176 * \retval -1 on error.
3178 static int collect_digits(struct ast_channel *c, int waittime, char *buf, int buflen, int pos)
3182 buf[pos] = '\0'; /* make sure it is properly terminated */
3183 while (ast_matchmore_extension(c, c->context, buf, 1, c->cid.cid_num)) {
3184 /* As long as we're willing to wait, and as long as it's not defined,
3185 keep reading digits until we can't possibly get a right answer anymore. */
3186 digit = ast_waitfordigit(c, waittime * 1000);
3187 if (c->_softhangup == AST_SOFTHANGUP_ASYNCGOTO) {
3190 if (!digit) /* No entry */
3192 if (digit < 0) /* Error, maybe a hangup */
3194 if (pos < buflen - 1) { /* XXX maybe error otherwise ? */
3198 waittime = c->pbx->dtimeout;
3204 static int __ast_pbx_run(struct ast_channel *c)
3206 int found = 0; /* set if we find at least one match */
3209 int error = 0; /* set an error conditions */
3211 /* A little initial setup here */
3213 ast_log(LOG_WARNING, "%s already has PBX structure??\n", c->name);
3214 /* XXX and now what ? */
3217 if (!(c->pbx = ast_calloc(1, sizeof(*c->pbx))))
3221 c->cdr = ast_cdr_alloc();
3223 ast_log(LOG_WARNING, "Unable to create Call Detail Record\n");
3227 ast_cdr_init(c->cdr, c);
3230 /* Set reasonable defaults */
3231 c->pbx->rtimeout = 10;
3232 c->pbx->dtimeout = 5;
3234 autoloopflag = ast_test_flag(c, AST_FLAG_IN_AUTOLOOP); /* save value to restore at the end */
3235 ast_set_flag(c, AST_FLAG_IN_AUTOLOOP);
3237 /* Start by trying whatever the channel is set to */
3238 if (!ast_exists_extension(c, c->context, c->exten, c->priority, c->cid.cid_num)) {
3239 /* If not successful fall back to 's' */
3240 ast_verb(2, "Starting %s at %s,%s,%d failed so falling back to exten 's'\n", c->name, c->context, c->exten, c->priority);
3241 /* XXX the original code used the existing priority in the call to
3242 * ast_exists_extension(), and reset it to 1 afterwards.
3243 * I believe the correct thing is to set it to 1 immediately.
3245 set_ext_pri(c, "s", 1);
3246 if (!ast_exists_extension(c, c->context, c->exten, c->priority, c->cid.cid_num)) {
3247 /* JK02: And finally back to default if everything else failed */
3248 ast_verb(2, "Starting %s at %s,%s,%d still failed so falling back to context 'default'\n", c->name, c->context, c->exten, c->priority);
3249 ast_copy_string(c->context, "default", sizeof(c->context));
3252 if (c->cdr && ast_tvzero(c->cdr->start))
3253 ast_cdr_start(c->cdr);
3255 char dst_exten[256]; /* buffer to accumulate digits */
3256 int pos = 0; /* XXX should check bounds */
3259 /* loop on priorities in this context/exten */
3260 while ( !(res = ast_spawn_extension(c, c->context, c->exten, c->priority, c->cid.cid_num, &found,1))) {
3261 if (c->_softhangup == AST_SOFTHANGUP_TIMEOUT && ast_exists_extension(c, c->context, "T", 1, c->cid.cid_num)) {
3262 set_ext_pri(c, "T", 0); /* 0 will become 1 with the c->priority++; at the end */
3263 /* If the AbsoluteTimeout is not reset to 0, we'll get an infinite loop */
3264 c->whentohangup = 0;
3265 c->_softhangup &= ~AST_SOFTHANGUP_TIMEOUT;
3266 } else if (c->_softhangup == AST_SOFTHANGUP_TIMEOUT && ast_exists_extension(c, c->context, "e", 1, c->cid.cid_num)) {
3267 pbx_builtin_raise_exception(c, "ABSOLUTETIMEOUT");
3268 /* If the AbsoluteTimeout is not reset to 0, we'll get an infinite loop */
3269 c->whentohangup = 0;
3270 c->_softhangup &= ~AST_SOFTHANGUP_TIMEOUT;
3271 } else if (ast_check_hangup(c)) {
3272 ast_debug(1, "Extension %s, priority %d returned normally even though call was hung up\n",
3273 c->exten, c->priority);
3278 } /* end while - from here on we can use 'break' to go out */
3280 /* Something bad happened, or a hangup has been requested. */
3281 if (strchr("0123456789ABCDEF*#", res)) {
3282 ast_debug(1, "Oooh, got something to jump out with ('%c')!\n", res);
3284 dst_exten[pos++] = digit = res;
3285 dst_exten[pos] = '\0';
3286 } else if (res == AST_PBX_KEEPALIVE) {
3287 ast_debug(1, "Spawn extension (%s,%s,%d) exited KEEPALIVE on '%s'\n", c->context, c->exten, c->priority, c->name);
3288 ast_verb(2, "Spawn extension (%s, %s, %d) exited KEEPALIVE on '%s'\n", c->context, c->exten, c->priority, c->name);
3291 ast_debug(1, "Spawn extension (%s,%s,%d) exited non-zero on '%s'\n", c->context, c->exten, c->priority, c->name);
3292 ast_verb(2, "Spawn extension (%s, %s, %d) exited non-zero on '%s'\n", c->context, c->exten, c->priority, c->name);
3294 if ((res == AST_PBX_ERROR) && ast_exists_extension(c, c->context, "e", 1, c->cid.cid_num)) {
3295 /* if we are already on the 'e' exten, don't jump to it again */
3296 if (!strcmp(c->exten, "e")) {
3297 ast_verb(2, "Spawn extension (%s, %s, %d) exited ERROR while already on 'e' exten on '%s'\n", c->context, c->exten, c->priority, c->name);
3300 pbx_builtin_raise_exception(c, "ERROR");
3305 if (c->_softhangup == AST_SOFTHANGUP_ASYNCGOTO) {
3307 } else if (c->_softhangup == AST_SOFTHANGUP_TIMEOUT) {
3308 /* atimeout, nothing bad */
3321 * We get here on a failure of some kind: non-existing extension or
3322 * hangup. We have options, here. We can either catch the failure
3323 * and continue, or we can drop out entirely. */
3325 if (!ast_exists_extension(c, c->context, c->exten, 1, c->cid.cid_num)) {
3327 * If there is no match at priority 1, it is not a valid extension anymore.
3328 * Try to continue at "i" (for invalid) or "e" (for exception) or exit if
3331 if (ast_exists_extension(c, c->context, "i", 1, c->cid.cid_num)) {
3332 ast_verb(3, "Sent into invalid extension '%s' in context '%s' on %s\n", c->exten, c->context, c->name);
3333 pbx_builtin_setvar_helper(c, "INVALID_EXTEN", c->exten);
3334 set_ext_pri(c, "i", 1);
3335 } else if (ast_exists_extension(c, c->context, "e", 1, c->cid.cid_num)) {
3336 pbx_builtin_raise_exception(c, "INVALID");
3338 ast_log(LOG_WARNING, "Channel '%s' sent into invalid extension '%s' in context '%s', but no invalid handler\n",
3339 c->name, c->exten, c->context);
3340 error = 1; /* we know what to do with it */
3343 } else if (c->_softhangup == AST_SOFTHANGUP_TIMEOUT) {
3344 /* If we get this far with AST_SOFTHANGUP_TIMEOUT, then we know that the "T" extension is next. */
3346 } else { /* keypress received, get more digits for a full extension */
3349 waittime = c->pbx->dtimeout;
3350 else if (!autofallthrough)
3351 waittime = c->pbx->rtimeout;
3353 const char *status = pbx_builtin_getvar_helper(c, "DIALSTATUS");
3356 ast_verb(3, "Auto fallthrough, channel '%s' status is '%s'\n", c->name, status);
3357 if (!strcasecmp(status, "CONGESTION"))
3358 res = pbx_builtin_congestion(c, "10");
3359 else if (!strcasecmp(status, "CHANUNAVAIL"))
3360 res = pbx_builtin_congestion(c, "10");
3361 else if (!strcasecmp(status, "BUSY"))
3362 res = pbx_builtin_busy(c, "10");
3363 error = 1; /* XXX disable message */
3364 break; /* exit from the 'for' loop */
3367 if (collect_digits(c, waittime, dst_exten, sizeof(dst_exten), pos))
3369 if (ast_exists_extension(c, c->context, dst_exten, 1, c->cid.cid_num)) /* Prepare the next cycle */
3370 set_ext_pri(c, dst_exten, 1);
3372 /* No such extension */
3373 if (!ast_strlen_zero(dst_exten)) {
3374 /* An invalid extension */
3375 if (ast_exists_extension(c, c->context, "i", 1, c->cid.cid_num)) {
3376 ast_verb(3, "Invalid extension '%s' in context '%s' on %s\n", dst_exten, c->context, c->name);
3377 pbx_builtin_setvar_helper(c, "INVALID_EXTEN", dst_exten);
3378 set_ext_pri(c, "i", 1);
3379 } else if (ast_exists_extension(c, c->context, "e", 1, c->cid.cid_num)) {
3380 pbx_builtin_raise_exception(c, "INVALID");
3382 ast_log(LOG_WARNING, "Invalid extension '%s', but no rule 'i' in context '%s'\n", dst_exten, c->context);
3383 found = 1; /* XXX disable message */
3387 /* A simple timeout */
3388 if (ast_exists_extension(c, c->context, "t", 1, c->cid.cid_num)) {
3389 ast_verb(3, "Timeout on %s\n", c->name);
3390 set_ext_pri(c, "t", 1);
3391 } else if (ast_exists_extension(c, c->context, "e", 1, c->cid.cid_num)) {
3392 pbx_builtin_raise_exception(c, "RESPONSETIMEOUT");
3394 ast_log(LOG_WARNING, "Timeout, but no rule 't' in context '%s'\n", c->context);
3395 found = 1; /* XXX disable message */
3401 ast_verb(2, "CDR updated on %s\n",c->name);
3406 if (!found && !error)
3407 ast_log(LOG_WARNING, "Don't know what to do with '%s'\n", c->name);
3408 if (res != AST_PBX_KEEPALIVE)
3409 ast_softhangup(c, c->hangupcause ? c->hangupcause : AST_CAUSE_NORMAL_CLEARING);
3410 if ((res != AST_PBX_KEEPALIVE) && ast_exists_extension(c, c->context, "h", 1, c->cid.cid_num)) {
3411 if (c->cdr && ast_opt_end_cdr_before_h_exten)
3412 ast_cdr_end(c->cdr);
3413 set_ext_pri(c, "h", 1);
3414 while ((res = ast_spawn_extension(c, c->context, c->exten, c->priority, c->cid.cid_num, &found, 1)) == 0) {
3418 /* Something bad happened, or a hangup has been requested. */
3419 ast_debug(1, "Spawn extension (%s,%s,%d) exited non-zero on '%s'\n", c->context, c->exten, c->priority, c->name);
3420 ast_verb(2, "Spawn extension (%s, %s, %d) exited non-zero on '%s'\n", c->context, c->exten, c->priority, c->name);
3423 ast_set2_flag(c, autoloopflag, AST_FLAG_IN_AUTOLOOP);
3425 pbx_destroy(c->pbx);
3427 if (res != AST_PBX_KEEPALIVE)
3433 * \brief Increase call count for channel
3434 * \retval 0 on success
3435 * \retval non-zero if a configured limit (maxcalls, maxload, minmemfree) was reached
3437 static int increase_call_count(const struct ast_channel *c)
3441 #if defined(HAVE_SYSINFO)
3443 struct sysinfo sys_info;
3446 ast_mutex_lock(&maxcalllock);
3447 if (option_maxcalls) {
3448 if (countcalls >= option_maxcalls) {
3449 ast_log(LOG_NOTICE, "Maximum call limit of %d calls exceeded by '%s'!\n", option_maxcalls, c->name);
3453 if (option_maxload) {
3454 getloadavg(&curloadavg, 1);
3455 if (curloadavg >= option_maxload) {
3456 ast_log(LOG_NOTICE, "Maximum loadavg limit of %f load exceeded by '%s' (currently %f)!\n", option_maxload, c->name, curloadavg);
3460 #if defined(HAVE_SYSINFO)
3461 if (option_minmemfree) {
3462 if (!sysinfo(&sys_info)) {
3463 /* make sure that the free system memory is above the configured low watermark
3464 * convert the amount of freeram from mem_units to MB */
3465 curfreemem = sys_info.freeram / sys_info.mem_unit;
3466 curfreemem /= 1024*1024;
3467 if (curfreemem < option_minmemfree) {
3468 ast_log(LOG_WARNING, "Available system memory (~%ldMB) is below the configured low watermark (%ldMB)\n", curfreemem, option_minmemfree);
3479 ast_mutex_unlock(&maxcalllock);
3484 static void decrease_call_count(void)
3486 ast_mutex_lock(&maxcalllock);
3489 ast_mutex_unlock(&maxcalllock);
3492 static void destroy_exten(struct ast_exten *e)
3494 if (e->priority == PRIORITY_HINT)
3498 ast_hashtab_destroy(e->peer_tree,0);
3499 if (e->peer_label_tree)
3500 ast_hashtab_destroy(e->peer_label_tree, 0);
3506 static void *pbx_thread(void *data)
3508 /* Oh joyeous kernel, we're a new thread, with nothing to do but
3509 answer this channel and get it going.
3512 The launcher of this function _MUST_ increment 'countcalls'
3513 before invoking the function; it will be decremented when the
3514 PBX has finished running on the channel
3516 struct ast_channel *c = data;