2 * Asterisk -- An open source telephony toolkit.
4 * Copyright (C) 1999 - 2008, Digium, Inc.
6 * Mark Spencer <markster@digium.com>
8 * See http://www.asterisk.org for more information about
9 * the Asterisk project. Please do not directly contact
10 * any of the maintainers of this project for assistance;
11 * the project provides a web site, mailing lists and IRC
12 * channels for your use.
14 * This program is free software, distributed under the terms of
15 * the GNU General Public License Version 2. See the LICENSE file
16 * at the top of the source tree.
21 * \brief Core PBX routines.
23 * \author Mark Spencer <markster@digium.com>
27 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
29 #include "asterisk/_private.h"
30 #include "asterisk/paths.h" /* use ast_config_AST_SYSTEM_NAME */
34 #if defined(HAVE_SYSINFO)
35 #include <sys/sysinfo.h>
38 #include <sys/loadavg.h>
41 #include "asterisk/lock.h"
42 #include "asterisk/cli.h"
43 #include "asterisk/pbx.h"
44 #include "asterisk/channel.h"
45 #include "asterisk/file.h"
46 #include "asterisk/callerid.h"
47 #include "asterisk/cdr.h"
48 #include "asterisk/cel.h"
49 #include "asterisk/config.h"
50 #include "asterisk/term.h"
51 #include "asterisk/time.h"
52 #include "asterisk/manager.h"
53 #include "asterisk/ast_expr.h"
54 #include "asterisk/linkedlists.h"
55 #define SAY_STUBS /* generate declarations and stubs for say methods */
56 #include "asterisk/say.h"
57 #include "asterisk/utils.h"
58 #include "asterisk/causes.h"
59 #include "asterisk/musiconhold.h"
60 #include "asterisk/app.h"
61 #include "asterisk/devicestate.h"
62 #include "asterisk/event.h"
63 #include "asterisk/hashtab.h"
64 #include "asterisk/module.h"
65 #include "asterisk/indications.h"
66 #include "asterisk/taskprocessor.h"
67 #include "asterisk/xmldoc.h"
68 #include "asterisk/astobj2.h"
71 * \note I M P O R T A N T :
73 * The speed of extension handling will likely be among the most important
74 * aspects of this PBX. The switching scheme as it exists right now isn't
75 * terribly bad (it's O(N+M), where N is the # of extensions and M is the avg #
76 * of priorities, but a constant search time here would be great ;-)
78 * A new algorithm to do searching based on a 'compiled' pattern tree is introduced
79 * here, and shows a fairly flat (constant) search time, even for over
82 * Also, using a hash table for context/priority name lookup can help prevent
83 * the find_extension routines from absorbing exponential cpu cycles as the number
84 * of contexts/priorities grow. I've previously tested find_extension with red-black trees,
85 * which have O(log2(n)) speed. Right now, I'm using hash tables, which do
86 * searches (ideally) in O(1) time. While these techniques do not yield much
87 * speed in small dialplans, they are worth the trouble in large dialplans.
92 <application name="Answer" language="en_US">
94 Answer a channel if ringing.
97 <parameter name="delay">
98 <para>Asterisk will wait this number of milliseconds before returning to
99 the dialplan after answering the call.</para>
101 <parameter name="nocdr">
102 <para>Asterisk will send an answer signal to the calling phone, but will not
103 set the disposition or answer time in the CDR for this call.</para>
107 <para>If the call has not been answered, this application will
108 answer it. Otherwise, it has no effect on the call.</para>
111 <ref type="application">Hangup</ref>
114 <application name="BackGround" language="en_US">
116 Play an audio file while waiting for digits of an extension to go to.
119 <parameter name="filenames" required="true" argsep="&">
120 <argument name="filename1" required="true" />
121 <argument name="filename2" multiple="true" />
123 <parameter name="options">
126 <para>Causes the playback of the message to be skipped
127 if the channel is not in the <literal>up</literal> state (i.e. it
128 hasn't been answered yet). If this happens, the
129 application will return immediately.</para>
132 <para>Don't answer the channel before playing the files.</para>
135 <para>Only break if a digit hit matches a one digit
136 extension in the destination context.</para>
140 <parameter name="langoverride">
141 <para>Explicitly specifies which language to attempt to use for the requested sound files.</para>
143 <parameter name="context">
144 <para>This is the dialplan context that this application will use when exiting
145 to a dialed extension.</para>
149 <para>This application will play the given list of files <emphasis>(do not put extension)</emphasis>
150 while waiting for an extension to be dialed by the calling channel. To continue waiting
151 for digits after this application has finished playing files, the <literal>WaitExten</literal>
152 application should be used.</para>
153 <para>If one of the requested sound files does not exist, call processing will be terminated.</para>
154 <para>This application sets the following channel variable upon completion:</para>
156 <variable name="BACKGROUNDSTATUS">
157 <para>The status of the background attempt as a text string.</para>
158 <value name="SUCCESS" />
159 <value name="FAILED" />
164 <ref type="application">ControlPlayback</ref>
165 <ref type="application">WaitExten</ref>
166 <ref type="application">BackgroundDetect</ref>
167 <ref type="function">TIMEOUT</ref>
170 <application name="Busy" language="en_US">
172 Indicate the Busy condition.
175 <parameter name="timeout">
176 <para>If specified, the calling channel will be hung up after the specified number of seconds.
177 Otherwise, this application will wait until the calling channel hangs up.</para>
181 <para>This application will indicate the busy condition to the calling channel.</para>
184 <ref type="application">Congestion</ref>
185 <ref type="application">Progess</ref>
186 <ref type="application">Playtones</ref>
187 <ref type="application">Hangup</ref>
190 <application name="Congestion" language="en_US">
192 Indicate the Congestion condition.
195 <parameter name="timeout">
196 <para>If specified, the calling channel will be hung up after the specified number of seconds.
197 Otherwise, this application will wait until the calling channel hangs up.</para>
201 <para>This application will indicate the congestion condition to the calling channel.</para>
204 <ref type="application">Busy</ref>
205 <ref type="application">Progess</ref>
206 <ref type="application">Playtones</ref>
207 <ref type="application">Hangup</ref>
210 <application name="ExecIfTime" language="en_US">
212 Conditional application execution based on the current time.
215 <parameter name="day_condition" required="true">
216 <argument name="times" required="true" />
217 <argument name="weekdays" required="true" />
218 <argument name="mdays" required="true" />
219 <argument name="months" required="true" />
220 <argument name="timezone" required="false" />
222 <parameter name="appname" required="true" hasparams="optional">
223 <argument name="appargs" required="true" />
227 <para>This application will execute the specified dialplan application, with optional
228 arguments, if the current time matches the given time specification.</para>
231 <ref type="application">Exec</ref>
232 <ref type="application">TryExec</ref>
235 <application name="Goto" language="en_US">
237 Jump to a particular priority, extension, or context.
240 <parameter name="context" />
241 <parameter name="extensions" />
242 <parameter name="priority" required="true" />
245 <para>This application will set the current context, extension, and priority in the channel structure.
246 After it completes, the pbx engine will continue dialplan execution at the specified location.
247 If no specific <replaceable>extension</replaceable>, or <replaceable>extension</replaceable> and
248 <replaceable>context</replaceable>, are specified, then this application will
249 just set the specified <replaceable>priority</replaceable> of the current extension.</para>
250 <para>At least a <replaceable>priority</replaceable> is required as an argument, or the goto will
251 return a <literal>-1</literal>, and the channel and call will be terminated.</para>
252 <para>If the location that is put into the channel information is bogus, and asterisk cannot
253 find that location in the dialplan, then the execution engine will try to find and execute the code in
254 the <literal>i</literal> (invalid) extension in the current context. If that does not exist, it will try to execute the
255 <literal>h</literal> extension. If neither the <literal>h</literal> nor <literal>i</literal> extensions
256 have been defined, the channel is hung up, and the execution of instructions on the channel is terminated.
257 What this means is that, for example, you specify a context that does not exist, then
258 it will not be possible to find the <literal>h</literal> or <literal>i</literal> extensions,
259 and the call will terminate!</para>
262 <ref type="application">GotoIf</ref>
263 <ref type="application">GotoIfTime</ref>
264 <ref type="application">Gosub</ref>
265 <ref type="application">Macro</ref>
268 <application name="GotoIf" language="en_US">
273 <parameter name="condition" required="true" />
274 <parameter name="destination" required="true" argsep=":">
275 <argument name="labeliftrue">
276 <para>Continue at <replaceable>labeliftrue</replaceable> if the condition is true.</para>
278 <argument name="labeliffalse">
279 <para>Continue at <replaceable>labeliffalse</replaceable> if the condition is false.</para>
284 <para>This application will set the current context, extension, and priority in the channel structure
285 based on the evaluation of the given condition. After this application completes, the
286 pbx engine will continue dialplan execution at the specified location in the dialplan.
287 The labels are specified with the same syntax as used within the Goto application.
288 If the label chosen by the condition is omitted, no jump is performed, and the execution passes to the
289 next instruction. If the target location is bogus, and does not exist, the execution engine will try
290 to find and execute the code in the <literal>i</literal> (invalid) extension in the current context.
291 If that does not exist, it will try to execute the <literal>h</literal> extension.
292 If neither the <literal>h</literal> nor <literal>i</literal> extensions have been defined,
293 the channel is hung up, and the execution of instructions on the channel is terminated.
294 Remember that this command can set the current context, and if the context specified
295 does not exist, then it will not be able to find any 'h' or 'i' extensions there, and
296 the channel and call will both be terminated!.</para>
299 <ref type="application">Goto</ref>
300 <ref type="application">GotoIfTime</ref>
301 <ref type="application">GosubIf</ref>
302 <ref type="application">MacroIf</ref>
305 <application name="GotoIfTime" language="en_US">
307 Conditional Goto based on the current time.
310 <parameter name="condition" required="true">
311 <argument name="times" required="true" />
312 <argument name="weekdays" required="true" />
313 <argument name="mdays" required="true" />
314 <argument name="months" required="true" />
315 <argument name="timezone" required="false" />
317 <parameter name="destination" required="true" argsep=":">
318 <argument name="labeliftrue" />
319 <argument name="labeliffalse" />
323 <para>This application will set the context, extension, and priority in the channel structure
324 based on the evaluation of the given time specification. After this application completes,
325 the pbx engine will continue dialplan execution at the specified location in the dialplan.
326 If the current time is within the given time specification, the channel will continue at
327 <replaceable>labeliftrue</replaceable>. Otherwise the channel will continue at <replaceable>labeliffalse</replaceable>.
328 If the label chosen by the condition is omitted, no jump is performed, and execution passes to the next
329 instruction. If the target jump location is bogus, the same actions would be taken as for <literal>Goto</literal>.
330 Further information on the time specification can be found in examples
331 illustrating how to do time-based context includes in the dialplan.</para>
334 <ref type="application">GotoIf</ref>
335 <ref type="function">IFTIME</ref>
336 <ref type="function">TESTTIME</ref>
339 <application name="ImportVar" language="en_US">
341 Import a variable from a channel into a new variable.
344 <parameter name="newvar" required="true" />
345 <parameter name="vardata" required="true">
346 <argument name="channelname" required="true" />
347 <argument name="variable" required="true" />
351 <para>This application imports a <replaceable>variable</replaceable> from the specified
352 <replaceable>channel</replaceable> (as opposed to the current one) and stores it as a variable
353 (<replaceable>newvar</replaceable>) in the current channel (the channel that is calling this
354 application). Variables created by this application have the same inheritance properties as those
355 created with the <literal>Set</literal> application.</para>
358 <ref type="application">Set</ref>
361 <application name="Hangup" language="en_US">
363 Hang up the calling channel.
366 <parameter name="causecode">
367 <para>If a <replaceable>causecode</replaceable> is given the channel's
368 hangup cause will be set to the given value.</para>
372 <para>This application will hang up the calling channel.</para>
375 <ref type="application">Answer</ref>
376 <ref type="application">Busy</ref>
377 <ref type="application">Congestion</ref>
380 <application name="Incomplete" language="en_US">
382 Returns AST_PBX_INCOMPLETE value.
386 <para>If specified, then Incomplete will not attempt to answer the channel first.</para>
387 <note><para>Most channel types need to be in Answer state in order to receive DTMF.</para></note>
391 <para>Signals the PBX routines that the previous matched extension is incomplete
392 and that further input should be allowed before matching can be considered
393 to be complete. Can be used within a pattern match when certain criteria warrants
394 a longer match.</para>
397 <application name="NoOp" language="en_US">
399 Do Nothing (No Operation).
402 <parameter name="text">
403 <para>Any text provided can be viewed at the Asterisk CLI.</para>
407 <para>This application does nothing. However, it is useful for debugging purposes.</para>
408 <para>This method can be used to see the evaluations of variables or functions without having any effect.</para>
411 <ref type="application">Verbose</ref>
412 <ref type="application">Log</ref>
415 <application name="Proceeding" language="en_US">
421 <para>This application will request that a proceeding message be provided to the calling channel.</para>
424 <application name="Progress" language="en_US">
430 <para>This application will request that in-band progress information be provided to the calling channel.</para>
433 <ref type="application">Busy</ref>
434 <ref type="application">Congestion</ref>
435 <ref type="application">Ringing</ref>
436 <ref type="application">Playtones</ref>
439 <application name="RaiseException" language="en_US">
441 Handle an exceptional condition.
444 <parameter name="reason" required="true" />
447 <para>This application will jump to the <literal>e</literal> extension in the current context, setting the
448 dialplan function EXCEPTION(). If the <literal>e</literal> extension does not exist, the call will hangup.</para>
451 <ref type="function">Exception</ref>
454 <application name="ResetCDR" language="en_US">
456 Resets the Call Data Record.
459 <parameter name="options">
462 <para>Store the current CDR record before resetting it.</para>
465 <para>Store any stacked records.</para>
468 <para>Save CDR variables.</para>
471 <para>Enable CDR only (negate effects of NoCDR).</para>
477 <para>This application causes the Call Data Record to be reset.</para>
480 <ref type="application">ForkCDR</ref>
481 <ref type="application">NoCDR</ref>
484 <application name="Ringing" language="en_US">
486 Indicate ringing tone.
490 <para>This application will request that the channel indicate a ringing tone to the user.</para>
493 <ref type="application">Busy</ref>
494 <ref type="application">Congestion</ref>
495 <ref type="application">Progress</ref>
496 <ref type="application">Playtones</ref>
499 <application name="SayAlpha" language="en_US">
504 <parameter name="string" required="true" />
507 <para>This application will play the sounds that correspond to the letters of the
508 given <replaceable>string</replaceable>.</para>
511 <ref type="application">SayDigits</ref>
512 <ref type="application">SayNumber</ref>
513 <ref type="application">SayPhonetic</ref>
514 <ref type="function">CHANNEL</ref>
517 <application name="SayDigits" language="en_US">
522 <parameter name="digits" required="true" />
525 <para>This application will play the sounds that correspond to the digits of
526 the given number. This will use the language that is currently set for the channel.</para>
529 <ref type="application">SayAlpha</ref>
530 <ref type="application">SayNumber</ref>
531 <ref type="application">SayPhonetic</ref>
532 <ref type="function">CHANNEL</ref>
535 <application name="SayNumber" language="en_US">
540 <parameter name="digits" required="true" />
541 <parameter name="gender" />
544 <para>This application will play the sounds that correspond to the given <replaceable>digits</replaceable>.
545 Optionally, a <replaceable>gender</replaceable> may be specified. This will use the language that is currently
546 set for the channel. See the LANGUAGE() function for more information on setting the language for the channel.</para>
549 <ref type="application">SayAlpha</ref>
550 <ref type="application">SayDigits</ref>
551 <ref type="application">SayPhonetic</ref>
552 <ref type="function">CHANNEL</ref>
555 <application name="SayPhonetic" language="en_US">
560 <parameter name="string" required="true" />
563 <para>This application will play the sounds from the phonetic alphabet that correspond to the
564 letters in the given <replaceable>string</replaceable>.</para>
567 <ref type="application">SayAlpha</ref>
568 <ref type="application">SayDigits</ref>
569 <ref type="application">SayNumber</ref>
572 <application name="Set" language="en_US">
574 Set channel variable or function value.
577 <parameter name="name" required="true" />
578 <parameter name="value" required="true" />
581 <para>This function can be used to set the value of channel variables or dialplan functions.
582 When setting variables, if the variable name is prefixed with <literal>_</literal>,
583 the variable will be inherited into channels created from the current channel.
584 If the variable name is prefixed with <literal>__</literal>, the variable will be
585 inherited into channels created from the current channel and all children channels.</para>
586 <note><para>If (and only if), in <filename>/etc/asterisk/asterisk.conf</filename>, you have
587 a <literal>[compat]</literal> category, and you have <literal>app_set = 1.4</literal> under that, then
588 the behavior of this app changes, and strips surrounding quotes from the right hand side as
589 it did previously in 1.4.
590 The advantages of not stripping out quoting, and not caring about the separator characters (comma and vertical bar)
591 were sufficient to make these changes in 1.6. Confusion about how many backslashes would be needed to properly
592 protect separators and quotes in various database access strings has been greatly
593 reduced by these changes.</para></note>
596 <ref type="application">MSet</ref>
597 <ref type="function">GLOBAL</ref>
598 <ref type="function">SET</ref>
599 <ref type="function">ENV</ref>
602 <application name="MSet" language="en_US">
604 Set channel variable(s) or function value(s).
607 <parameter name="set1" required="true" argsep="=">
608 <argument name="name1" required="true" />
609 <argument name="value1" required="true" />
611 <parameter name="set2" multiple="true" argsep="=">
612 <argument name="name2" required="true" />
613 <argument name="value2" required="true" />
617 <para>This function can be used to set the value of channel variables or dialplan functions.
618 When setting variables, if the variable name is prefixed with <literal>_</literal>,
619 the variable will be inherited into channels created from the current channel
620 If the variable name is prefixed with <literal>__</literal>, the variable will be
621 inherited into channels created from the current channel and all children channels.
622 MSet behaves in a similar fashion to the way Set worked in 1.2/1.4 and is thus
623 prone to doing things that you may not expect. For example, it strips surrounding
624 double-quotes from the right-hand side (value). If you need to put a separator
625 character (comma or vert-bar), you will need to escape them by inserting a backslash
626 before them. Avoid its use if possible.</para>
629 <ref type="application">Set</ref>
632 <application name="SetAMAFlags" language="en_US">
637 <parameter name="flag" />
640 <para>This application will set the channel's AMA Flags for billing purposes.</para>
643 <ref type="function">CDR</ref>
646 <application name="Wait" language="en_US">
651 <parameter name="seconds" required="true">
652 <para>Can be passed with fractions of a second. For example, <literal>1.5</literal> will ask the
653 application to wait for 1.5 seconds.</para>
657 <para>This application waits for a specified number of <replaceable>seconds</replaceable>.</para>
660 <application name="WaitExten" language="en_US">
662 Waits for an extension to be entered.
665 <parameter name="seconds">
666 <para>Can be passed with fractions of a second. For example, <literal>1.5</literal> will ask the
667 application to wait for 1.5 seconds.</para>
669 <parameter name="options">
672 <para>Provide music on hold to the caller while waiting for an extension.</para>
674 <para>Specify the class for music on hold.</para>
681 <para>This application waits for the user to enter a new extension for a specified number
682 of <replaceable>seconds</replaceable>.</para>
683 <xi:include xpointer="xpointer(/docs/application[@name='Macro']/description/warning[2])" />
686 <ref type="application">Background</ref>
687 <ref type="function">TIMEOUT</ref>
690 <function name="EXCEPTION" language="en_US">
692 Retrieve the details of the current dialplan exception.
695 <parameter name="field" required="true">
696 <para>The following fields are available for retrieval:</para>
699 <para>INVALID, ERROR, RESPONSETIMEOUT, ABSOLUTETIMEOUT, or custom
700 value set by the RaiseException() application</para>
702 <enum name="context">
703 <para>The context executing when the exception occurred.</para>
706 <para>The extension executing when the exception occurred.</para>
708 <enum name="priority">
709 <para>The numeric priority executing when the exception occurred.</para>
715 <para>Retrieve the details (specified <replaceable>field</replaceable>) of the current dialplan exception.</para>
718 <ref type="application">RaiseException</ref>
721 <function name="TESTTIME" language="en_US">
723 Sets a time to be used with the channel to test logical conditions.
726 <parameter name="date" required="true" argsep=" ">
727 <para>Date in ISO 8601 format</para>
729 <parameter name="time" required="true" argsep=" ">
730 <para>Time in HH:MM:SS format (24-hour time)</para>
732 <parameter name="zone" required="false">
733 <para>Timezone name</para>
737 <para>To test dialplan timing conditions at times other than the current time, use
738 this function to set an alternate date and time. For example, you may wish to evaluate
739 whether a location will correctly identify to callers that the area is closed on Christmas
740 Day, when Christmas would otherwise fall on a day when the office is normally open.</para>
743 <ref type="application">GotoIfTime</ref>
746 <manager name="ShowDialPlan" language="en_US">
748 Show dialplan contexts and extensions
751 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
752 <parameter name="Extension">
753 <para>Show a specific extension.</para>
755 <parameter name="Context">
756 <para>Show a specific context.</para>
760 <para>Show dialplan contexts and extensions. Be aware that showing the full dialplan
761 may take a lot of capacity.</para>
767 #define EXT_DATA_SIZE 256
769 #define EXT_DATA_SIZE 8192
772 #define SWITCH_DATA_LENGTH 256
774 #define VAR_BUF_SIZE 4096
777 #define VAR_SOFTTRAN 2
778 #define VAR_HARDTRAN 3
780 #define BACKGROUND_SKIP (1 << 0)
781 #define BACKGROUND_NOANSWER (1 << 1)
782 #define BACKGROUND_MATCHEXTEN (1 << 2)
783 #define BACKGROUND_PLAYBACK (1 << 3)
785 AST_APP_OPTIONS(background_opts, {
786 AST_APP_OPTION('s', BACKGROUND_SKIP),
787 AST_APP_OPTION('n', BACKGROUND_NOANSWER),
788 AST_APP_OPTION('m', BACKGROUND_MATCHEXTEN),
789 AST_APP_OPTION('p', BACKGROUND_PLAYBACK),
792 #define WAITEXTEN_MOH (1 << 0)
793 #define WAITEXTEN_DIALTONE (1 << 1)
795 AST_APP_OPTIONS(waitexten_opts, {
796 AST_APP_OPTION_ARG('m', WAITEXTEN_MOH, 0),
797 AST_APP_OPTION_ARG('d', WAITEXTEN_DIALTONE, 0),
803 static struct ast_taskprocessor *device_state_tps;
805 AST_THREADSTORAGE(switch_data);
806 AST_THREADSTORAGE(extensionstate_buf);
809 \brief ast_exten: An extension
810 The dialplan is saved as a linked list with each context
811 having it's own linked list of extensions - one item per
815 char *exten; /*!< Extension name */
816 int matchcid; /*!< Match caller id ? */
817 const char *cidmatch; /*!< Caller id to match for this extension */
818 int priority; /*!< Priority */
819 const char *label; /*!< Label */
820 struct ast_context *parent; /*!< The context this extension belongs to */
821 const char *app; /*!< Application to execute */
822 struct ast_app *cached_app; /*!< Cached location of application */
823 void *data; /*!< Data to use (arguments) */
824 void (*datad)(void *); /*!< Data destructor */
825 struct ast_exten *peer; /*!< Next higher priority with our extension */
826 struct ast_hashtab *peer_table; /*!< Priorities list in hashtab form -- only on the head of the peer list */
827 struct ast_hashtab *peer_label_table; /*!< labeled priorities in the peers -- only on the head of the peer list */
828 const char *registrar; /*!< Registrar */
829 struct ast_exten *next; /*!< Extension with a greater ID */
833 /*! \brief ast_include: include= support in extensions.conf */
836 const char *rname; /*!< Context to include */
837 const char *registrar; /*!< Registrar */
838 int hastime; /*!< If time construct exists */
839 struct ast_timing timing; /*!< time construct */
840 struct ast_include *next; /*!< Link them together */
844 /*! \brief ast_sw: Switch statement in extensions.conf */
847 const char *registrar; /*!< Registrar */
848 char *data; /*!< Data load */
850 AST_LIST_ENTRY(ast_sw) list;
854 /*! \brief ast_ignorepat: Ignore patterns in dial plan */
855 struct ast_ignorepat {
856 const char *registrar;
857 struct ast_ignorepat *next;
858 const char pattern[0];
861 /*! \brief match_char: forms a syntax tree for quick matching of extension patterns */
864 int is_pattern; /* the pattern started with '_' */
865 int deleted; /* if this is set, then... don't return it */
866 int specificity; /* simply the strlen of x, or 10 for X, 9 for Z, and 8 for N; and '.' and '!' will add 11 ? */
867 struct match_char *alt_char;
868 struct match_char *next_char;
869 struct ast_exten *exten; /* attached to last char of a pattern for exten */
870 char x[1]; /* the pattern itself-- matches a single char */
873 struct scoreboard /* make sure all fields are 0 before calling new_find_extension */
875 int total_specificity;
877 char last_char; /* set to ! or . if they are the end of the pattern */
878 int canmatch; /* if the string to match was just too short */
879 struct match_char *node;
880 struct ast_exten *canmatch_exten;
881 struct ast_exten *exten;
884 /*! \brief ast_context: An extension context */
886 ast_rwlock_t lock; /*!< A lock to prevent multiple threads from clobbering the context */
887 struct ast_exten *root; /*!< The root of the list of extensions */
888 struct ast_hashtab *root_table; /*!< For exact matches on the extensions in the pattern tree, and for traversals of the pattern_tree */
889 struct match_char *pattern_tree; /*!< A tree to speed up extension pattern matching */
890 struct ast_context *next; /*!< Link them together */
891 struct ast_include *includes; /*!< Include other contexts */
892 struct ast_ignorepat *ignorepats; /*!< Patterns for which to continue playing dialtone */
893 char *registrar; /*!< Registrar -- make sure you malloc this, as the registrar may have to survive module unloads */
894 int refcount; /*!< each module that would have created this context should inc/dec this as appropriate */
895 AST_LIST_HEAD_NOLOCK(, ast_sw) alts; /*!< Alternative switches */
896 ast_mutex_t macrolock; /*!< A lock to implement "exclusive" macros - held whilst a call is executing in the macro */
897 char name[0]; /*!< Name of the context */
900 /*! \brief ast_app: A registered application */
902 int (*execute)(struct ast_channel *chan, const char *data);
903 AST_DECLARE_STRING_FIELDS(
904 AST_STRING_FIELD(synopsis); /*!< Synopsis text for 'show applications' */
905 AST_STRING_FIELD(description); /*!< Description (help text) for 'show application <name>' */
906 AST_STRING_FIELD(syntax); /*!< Syntax text for 'core show applications' */
907 AST_STRING_FIELD(arguments); /*!< Arguments description */
908 AST_STRING_FIELD(seealso); /*!< See also */
911 enum ast_doc_src docsrc; /*!< Where the documentation come from. */
913 AST_RWLIST_ENTRY(ast_app) list; /*!< Next app in list */
914 struct ast_module *module; /*!< Module this app belongs to */
915 char name[0]; /*!< Name of the application */
918 /*! \brief ast_state_cb: An extension state notify register item */
919 struct ast_state_cb {
922 ast_state_cb_type callback;
923 /*! \note Only used by ast_merge_contexts_and_delete */
924 AST_LIST_ENTRY(ast_state_cb) entry;
928 * \brief Structure for dial plan hints
930 * \note Hints are pointers from an extension in the dialplan to
931 * one or more devices (tech/name)
933 * See \ref AstExtState
937 * \brief Hint extension
940 * Will never be NULL while the hint is in the hints container.
942 struct ast_exten *exten;
943 struct ao2_container *callbacks; /*!< Callback container for this extension */
944 int laststate; /*!< Last known state */
945 char context_name[AST_MAX_CONTEXT];/*!< Context of destroyed hint extension. */
946 char exten_name[AST_MAX_EXTENSION];/*!< Extension of destroyed hint extension. */
950 #define HINTDEVICE_DATA_LENGTH 16
951 AST_THREADSTORAGE(hintdevice_data);
953 /* --- Hash tables of various objects --------*/
955 static const int HASH_EXTENHINT_SIZE = 17;
957 static const int HASH_EXTENHINT_SIZE = 563;
961 /*! \brief Container for hint devices */
962 static struct ao2_container *hintdevices;
965 * \brief Structure for dial plan hint devices
966 * \note hintdevice is one device pointing to a hint.
968 struct ast_hintdevice {
970 * \brief Hint this hintdevice belongs to.
971 * \note Holds a reference to the hint object.
973 struct ast_hint *hint;
974 /*! Name of the hint device. */
980 * \note Using the device for hash
982 static int hintdevice_hash_cb(const void *obj, const int flags)
984 const struct ast_hintdevice *ext = obj;
986 return ast_str_case_hash(ext->hintdevice);
989 * \note Devices on hints are not unique so no CMP_STOP is returned
990 * Dont use ao2_find against hintdevices container cause there always
991 * could be more than one result.
993 static int hintdevice_cmp_multiple(void *obj, void *arg, int flags)
995 struct ast_hintdevice *ext = obj, *ext2 = arg;
997 return !strcasecmp(ext->hintdevice, ext2->hintdevice) ? CMP_MATCH : 0;
1001 * \details This is used with ao2_callback to remove old devices
1002 * when they are linked to the hint
1004 static int hintdevice_remove_cb(void *deviceobj, void *arg, int flags)
1006 struct ast_hintdevice *device = deviceobj;
1007 struct ast_hint *hint = arg;
1009 return (device->hint == hint) ? CMP_MATCH : 0;
1012 static int remove_hintdevice(struct ast_hint *hint)
1014 /* iterate through all devices and remove the devices which are linked to this hint */
1015 ao2_t_callback(hintdevices, OBJ_NODATA | OBJ_MULTIPLE | OBJ_UNLINK,
1016 hintdevice_remove_cb, hint,
1017 "callback to remove all devices which are linked to a hint");
1023 * \brief Destroy the given hintdevice object.
1025 * \param obj Hint device to destroy.
1029 static void hintdevice_destroy(void *obj)
1031 struct ast_hintdevice *doomed = obj;
1034 ao2_ref(doomed->hint, -1);
1035 doomed->hint = NULL;
1039 /*! \brief add hintdevice structure and link it into the container.
1041 static int add_hintdevice(struct ast_hint *hint, const char *devicelist)
1043 struct ast_str *str;
1046 struct ast_hintdevice *device;
1049 if (!hint || !devicelist) {
1050 /* Trying to add garbage? Don't bother. */
1053 if (!(str = ast_str_thread_get(&hintdevice_data, 16))) {
1056 ast_str_set(&str, 0, "%s", devicelist);
1057 parse = ast_str_buffer(str);
1059 while ((cur = strsep(&parse, "&"))) {
1060 devicelength = strlen(cur);
1061 device = ao2_t_alloc(sizeof(*device) + devicelength, hintdevice_destroy,
1062 "allocating a hintdevice structure");
1066 strcpy(device->hintdevice, cur);
1068 device->hint = hint;
1069 ao2_t_link(hintdevices, device, "Linking device into hintdevice container.");
1070 ao2_t_ref(device, -1, "hintdevice is linked so we can unref");
1077 static const struct cfextension_states {
1078 int extension_state;
1079 const char * const text;
1080 } extension_states[] = {
1081 { AST_EXTENSION_NOT_INUSE, "Idle" },
1082 { AST_EXTENSION_INUSE, "InUse" },
1083 { AST_EXTENSION_BUSY, "Busy" },
1084 { AST_EXTENSION_UNAVAILABLE, "Unavailable" },
1085 { AST_EXTENSION_RINGING, "Ringing" },
1086 { AST_EXTENSION_INUSE | AST_EXTENSION_RINGING, "InUse&Ringing" },
1087 { AST_EXTENSION_ONHOLD, "Hold" },
1088 { AST_EXTENSION_INUSE | AST_EXTENSION_ONHOLD, "InUse&Hold" }
1091 struct statechange {
1092 AST_LIST_ENTRY(statechange) entry;
1096 struct pbx_exception {
1097 AST_DECLARE_STRING_FIELDS(
1098 AST_STRING_FIELD(context); /*!< Context associated with this exception */
1099 AST_STRING_FIELD(exten); /*!< Exten associated with this exception */
1100 AST_STRING_FIELD(reason); /*!< The exception reason */
1103 int priority; /*!< Priority associated with this exception */
1106 static int pbx_builtin_answer(struct ast_channel *, const char *);
1107 static int pbx_builtin_goto(struct ast_channel *, const char *);
1108 static int pbx_builtin_hangup(struct ast_channel *, const char *);
1109 static int pbx_builtin_background(struct ast_channel *, const char *);
1110 static int pbx_builtin_wait(struct ast_channel *, const char *);
1111 static int pbx_builtin_waitexten(struct ast_channel *, const char *);
1112 static int pbx_builtin_incomplete(struct ast_channel *, const char *);
1113 static int pbx_builtin_resetcdr(struct ast_channel *, const char *);
1114 static int pbx_builtin_setamaflags(struct ast_channel *, const char *);
1115 static int pbx_builtin_ringing(struct ast_channel *, const char *);
1116 static int pbx_builtin_proceeding(struct ast_channel *, const char *);
1117 static int pbx_builtin_progress(struct ast_channel *, const char *);
1118 static int pbx_builtin_congestion(struct ast_channel *, const char *);
1119 static int pbx_builtin_busy(struct ast_channel *, const char *);
1120 static int pbx_builtin_noop(struct ast_channel *, const char *);
1121 static int pbx_builtin_gotoif(struct ast_channel *, const char *);
1122 static int pbx_builtin_gotoiftime(struct ast_channel *, const char *);
1123 static int pbx_builtin_execiftime(struct ast_channel *, const char *);
1124 static int pbx_builtin_saynumber(struct ast_channel *, const char *);
1125 static int pbx_builtin_saydigits(struct ast_channel *, const char *);
1126 static int pbx_builtin_saycharacters(struct ast_channel *, const char *);
1127 static int pbx_builtin_sayphonetic(struct ast_channel *, const char *);
1128 static int matchcid(const char *cidpattern, const char *callerid);
1130 static void log_match_char_tree(struct match_char *node, char *prefix); /* for use anywhere */
1132 static int pbx_builtin_importvar(struct ast_channel *, const char *);
1133 static void set_ext_pri(struct ast_channel *c, const char *exten, int pri);
1134 static void new_find_extension(const char *str, struct scoreboard *score,
1135 struct match_char *tree, int length, int spec, const char *callerid,
1136 const char *label, enum ext_match_t action);
1137 static struct match_char *already_in_tree(struct match_char *current, char *pat, int is_pattern);
1138 static struct match_char *add_exten_to_pattern_tree(struct ast_context *con,
1139 struct ast_exten *e1, int findonly);
1140 static struct match_char *add_pattern_node(struct ast_context *con,
1141 struct match_char *current, char *pattern, int is_pattern,
1142 int already, int specificity, struct match_char **parent);
1143 static void create_match_char_tree(struct ast_context *con);
1144 static struct ast_exten *get_canmatch_exten(struct match_char *node);
1145 static void destroy_pattern_tree(struct match_char *pattern_tree);
1146 static int hashtab_compare_extens(const void *ha_a, const void *ah_b);
1147 static int hashtab_compare_exten_numbers(const void *ah_a, const void *ah_b);
1148 static int hashtab_compare_exten_labels(const void *ah_a, const void *ah_b);
1149 static unsigned int hashtab_hash_extens(const void *obj);
1150 static unsigned int hashtab_hash_priority(const void *obj);
1151 static unsigned int hashtab_hash_labels(const void *obj);
1152 static void __ast_internal_context_destroy( struct ast_context *con);
1153 static int ast_add_extension_nolock(const char *context, int replace, const char *extension,
1154 int priority, const char *label, const char *callerid,
1155 const char *application, void *data, void (*datad)(void *), const char *registrar);
1156 static int ast_add_extension2_lockopt(struct ast_context *con,
1157 int replace, const char *extension, int priority, const char *label, const char *callerid,
1158 const char *application, void *data, void (*datad)(void *),
1159 const char *registrar, int lock_context);
1160 static struct ast_context *find_context_locked(const char *context);
1161 static struct ast_context *find_context(const char *context);
1163 /* a func for qsort to use to sort a char array */
1164 static int compare_char(const void *a, const void *b)
1170 else if ((*ac) == (*bc))
1176 /* labels, contexts are case sensitive priority numbers are ints */
1177 int ast_hashtab_compare_contexts(const void *ah_a, const void *ah_b)
1179 const struct ast_context *ac = ah_a;
1180 const struct ast_context *bc = ah_b;
1181 if (!ac || !bc) /* safety valve, but it might prevent a crash you'd rather have happen */
1183 /* assume context names are registered in a string table! */
1184 return strcmp(ac->name, bc->name);
1187 static int hashtab_compare_extens(const void *ah_a, const void *ah_b)
1189 const struct ast_exten *ac = ah_a;
1190 const struct ast_exten *bc = ah_b;
1191 int x = strcmp(ac->exten, bc->exten);
1192 if (x) { /* if exten names are diff, then return */
1196 /* but if they are the same, do the cidmatch values match? */
1197 if (ac->matchcid && bc->matchcid) {
1198 return strcmp(ac->cidmatch,bc->cidmatch);
1199 } else if (!ac->matchcid && !bc->matchcid) {
1200 return 0; /* if there's no matchcid on either side, then this is a match */
1202 return 1; /* if there's matchcid on one but not the other, they are different */
1206 static int hashtab_compare_exten_numbers(const void *ah_a, const void *ah_b)
1208 const struct ast_exten *ac = ah_a;
1209 const struct ast_exten *bc = ah_b;
1210 return ac->priority != bc->priority;
1213 static int hashtab_compare_exten_labels(const void *ah_a, const void *ah_b)
1215 const struct ast_exten *ac = ah_a;
1216 const struct ast_exten *bc = ah_b;
1217 return strcmp(S_OR(ac->label, ""), S_OR(bc->label, ""));
1220 unsigned int ast_hashtab_hash_contexts(const void *obj)
1222 const struct ast_context *ac = obj;
1223 return ast_hashtab_hash_string(ac->name);
1226 static unsigned int hashtab_hash_extens(const void *obj)
1228 const struct ast_exten *ac = obj;
1229 unsigned int x = ast_hashtab_hash_string(ac->exten);
1232 y = ast_hashtab_hash_string(ac->cidmatch);
1236 static unsigned int hashtab_hash_priority(const void *obj)
1238 const struct ast_exten *ac = obj;
1239 return ast_hashtab_hash_int(ac->priority);
1242 static unsigned int hashtab_hash_labels(const void *obj)
1244 const struct ast_exten *ac = obj;
1245 return ast_hashtab_hash_string(S_OR(ac->label, ""));
1249 AST_RWLOCK_DEFINE_STATIC(globalslock);
1250 static struct varshead globals = AST_LIST_HEAD_NOLOCK_INIT_VALUE;
1252 static int autofallthrough = 1;
1253 static int extenpatternmatchnew = 0;
1254 static char *overrideswitch = NULL;
1256 /*! \brief Subscription for device state change events */
1257 static struct ast_event_sub *device_state_sub;
1259 AST_MUTEX_DEFINE_STATIC(maxcalllock);
1260 static int countcalls;
1261 static int totalcalls;
1263 static AST_RWLIST_HEAD_STATIC(acf_root, ast_custom_function);
1265 /*! \brief Declaration of builtin applications */
1266 static struct pbx_builtin {
1267 char name[AST_MAX_APP];
1268 int (*execute)(struct ast_channel *chan, const char *data);
1271 /* These applications are built into the PBX core and do not
1272 need separate modules */
1274 { "Answer", pbx_builtin_answer },
1275 { "BackGround", pbx_builtin_background },
1276 { "Busy", pbx_builtin_busy },
1277 { "Congestion", pbx_builtin_congestion },
1278 { "ExecIfTime", pbx_builtin_execiftime },
1279 { "Goto", pbx_builtin_goto },
1280 { "GotoIf", pbx_builtin_gotoif },
1281 { "GotoIfTime", pbx_builtin_gotoiftime },
1282 { "ImportVar", pbx_builtin_importvar },
1283 { "Hangup", pbx_builtin_hangup },
1284 { "Incomplete", pbx_builtin_incomplete },
1285 { "NoOp", pbx_builtin_noop },
1286 { "Proceeding", pbx_builtin_proceeding },
1287 { "Progress", pbx_builtin_progress },
1288 { "RaiseException", pbx_builtin_raise_exception },
1289 { "ResetCDR", pbx_builtin_resetcdr },
1290 { "Ringing", pbx_builtin_ringing },
1291 { "SayAlpha", pbx_builtin_saycharacters },
1292 { "SayDigits", pbx_builtin_saydigits },
1293 { "SayNumber", pbx_builtin_saynumber },
1294 { "SayPhonetic", pbx_builtin_sayphonetic },
1295 { "Set", pbx_builtin_setvar },
1296 { "MSet", pbx_builtin_setvar_multiple },
1297 { "SetAMAFlags", pbx_builtin_setamaflags },
1298 { "Wait", pbx_builtin_wait },
1299 { "WaitExten", pbx_builtin_waitexten }
1302 static struct ast_context *contexts;
1303 static struct ast_hashtab *contexts_table = NULL;
1306 * \brief Lock for the ast_context list
1308 * This lock MUST be recursive, or a deadlock on reload may result. See
1309 * https://issues.asterisk.org/view.php?id=17643
1311 AST_MUTEX_DEFINE_STATIC(conlock);
1314 * \brief Lock to hold off restructuring of hints by ast_merge_contexts_and_delete.
1316 AST_MUTEX_DEFINE_STATIC(context_merge_lock);
1318 static AST_RWLIST_HEAD_STATIC(apps, ast_app);
1320 static AST_RWLIST_HEAD_STATIC(switches, ast_switch);
1322 static int stateid = 1;
1324 * \note When holding this container's lock, do _not_ do
1325 * anything that will cause conlock to be taken, unless you
1326 * _already_ hold it. The ast_merge_contexts_and_delete function
1327 * will take the locks in conlock/hints order, so any other
1328 * paths that require both locks must also take them in that
1331 static struct ao2_container *hints;
1333 static struct ao2_container *statecbs;
1335 #ifdef CONTEXT_DEBUG
1337 /* these routines are provided for doing run-time checks
1338 on the extension structures, in case you are having
1339 problems, this routine might help you localize where
1340 the problem is occurring. It's kinda like a debug memory
1341 allocator's arena checker... It'll eat up your cpu cycles!
1342 but you'll see, if you call it in the right places,
1343 right where your problems began...
1346 /* you can break on the check_contexts_trouble()
1347 routine in your debugger to stop at the moment
1348 there's a problem */
1349 void check_contexts_trouble(void);
1351 void check_contexts_trouble(void)
1357 int check_contexts(char *, int);
1359 int check_contexts(char *file, int line )
1361 struct ast_hashtab_iter *t1;
1362 struct ast_context *c1, *c2;
1364 struct ast_exten *e1, *e2, *e3;
1365 struct ast_exten ex;
1367 /* try to find inconsistencies */
1368 /* is every context in the context table in the context list and vice-versa ? */
1370 if (!contexts_table) {
1371 ast_log(LOG_NOTICE,"Called from: %s:%d: No contexts_table!\n", file, line);
1375 t1 = ast_hashtab_start_traversal(contexts_table);
1376 while( (c1 = ast_hashtab_next(t1))) {
1377 for(c2=contexts;c2;c2=c2->next) {
1378 if (!strcmp(c1->name, c2->name)) {
1384 ast_log(LOG_NOTICE,"Called from: %s:%d: Could not find the %s context in the linked list\n", file, line, c1->name);
1385 check_contexts_trouble();
1388 ast_hashtab_end_traversal(t1);
1389 for(c2=contexts;c2;c2=c2->next) {
1390 c1 = find_context_locked(c2->name);
1392 ast_log(LOG_NOTICE,"Called from: %s:%d: Could not find the %s context in the hashtab\n", file, line, c2->name);
1393 check_contexts_trouble();
1395 ast_unlock_contexts();
1398 /* loop thru all contexts, and verify the exten structure compares to the
1399 hashtab structure */
1400 for(c2=contexts;c2;c2=c2->next) {
1401 c1 = find_context_locked(c2->name);
1403 ast_unlock_contexts();
1405 /* is every entry in the root list also in the root_table? */
1406 for(e1 = c1->root; e1; e1=e1->next)
1408 char dummy_name[1024];
1409 ex.exten = dummy_name;
1410 ex.matchcid = e1->matchcid;
1411 ex.cidmatch = e1->cidmatch;
1412 ast_copy_string(dummy_name, e1->exten, sizeof(dummy_name));
1413 e2 = ast_hashtab_lookup(c1->root_table, &ex);
1416 ast_log(LOG_NOTICE,"Called from: %s:%d: The %s context records the exten %s (CID match: %s) but it is not in its root_table\n", file, line, c2->name, dummy_name, e1->cidmatch );
1418 ast_log(LOG_NOTICE,"Called from: %s:%d: The %s context records the exten %s but it is not in its root_table\n", file, line, c2->name, dummy_name );
1420 check_contexts_trouble();
1424 /* is every entry in the root_table also in the root list? */
1425 if (!c2->root_table) {
1427 ast_log(LOG_NOTICE,"Called from: %s:%d: No c2->root_table for context %s!\n", file, line, c2->name);
1431 t1 = ast_hashtab_start_traversal(c2->root_table);
1432 while( (e2 = ast_hashtab_next(t1)) ) {
1433 for(e1=c2->root;e1;e1=e1->next) {
1434 if (!strcmp(e1->exten, e2->exten)) {
1440 ast_log(LOG_NOTICE,"Called from: %s:%d: The %s context records the exten %s but it is not in its root_table\n", file, line, c2->name, e2->exten);
1441 check_contexts_trouble();
1445 ast_hashtab_end_traversal(t1);
1448 /* is every priority reflected in the peer_table at the head of the list? */
1450 /* is every entry in the root list also in the root_table? */
1451 /* are the per-extension peer_tables in the right place? */
1453 for(e1 = c2->root; e1; e1 = e1->next) {
1455 for(e2=e1;e2;e2=e2->peer) {
1456 ex.priority = e2->priority;
1457 if (e2 != e1 && e2->peer_table) {
1458 ast_log(LOG_NOTICE,"Called from: %s:%d: The %s context, %s exten, %d priority has a peer_table entry, and shouldn't!\n", file, line, c2->name, e1->exten, e2->priority );
1459 check_contexts_trouble();
1462 if (e2 != e1 && e2->peer_label_table) {
1463 ast_log(LOG_NOTICE,"Called from: %s:%d: The %s context, %s exten, %d priority has a peer_label_table entry, and shouldn't!\n", file, line, c2->name, e1->exten, e2->priority );
1464 check_contexts_trouble();
1467 if (e2 == e1 && !e2->peer_table){
1468 ast_log(LOG_NOTICE,"Called from: %s:%d: The %s context, %s exten, %d priority doesn't have a peer_table!\n", file, line, c2->name, e1->exten, e2->priority );
1469 check_contexts_trouble();
1472 if (e2 == e1 && !e2->peer_label_table) {
1473 ast_log(LOG_NOTICE,"Called from: %s:%d: The %s context, %s exten, %d priority doesn't have a peer_label_table!\n", file, line, c2->name, e1->exten, e2->priority );
1474 check_contexts_trouble();
1478 e3 = ast_hashtab_lookup(e1->peer_table, &ex);
1480 ast_log(LOG_NOTICE,"Called from: %s:%d: The %s context, %s exten, %d priority is not reflected in the peer_table\n", file, line, c2->name, e1->exten, e2->priority );
1481 check_contexts_trouble();
1485 if (!e1->peer_table){
1486 ast_log(LOG_NOTICE,"Called from: %s:%d: No e1->peer_table!\n", file, line);
1490 /* is every entry in the peer_table also in the peer list? */
1491 t1 = ast_hashtab_start_traversal(e1->peer_table);
1492 while( (e2 = ast_hashtab_next(t1)) ) {
1493 for(e3=e1;e3;e3=e3->peer) {
1494 if (e3->priority == e2->priority) {
1500 ast_log(LOG_NOTICE,"Called from: %s:%d: The %s context, %s exten, %d priority is not reflected in the peer list\n", file, line, c2->name, e1->exten, e2->priority );
1501 check_contexts_trouble();
1504 ast_hashtab_end_traversal(t1);
1512 \note This function is special. It saves the stack so that no matter
1513 how many times it is called, it returns to the same place */
1514 int pbx_exec(struct ast_channel *c, /*!< Channel */
1515 struct ast_app *app, /*!< Application */
1516 const char *data) /*!< Data for execution */
1519 struct ast_module_user *u = NULL;
1520 const char *saved_c_appl;
1521 const char *saved_c_data;
1523 if (c->cdr && !ast_check_hangup(c))
1524 ast_cdr_setapp(c->cdr, app->name, data);
1526 /* save channel values */
1527 saved_c_appl= c->appl;
1528 saved_c_data= c->data;
1530 c->appl = app->name;
1532 ast_cel_report_event(c, AST_CEL_APP_START, NULL, NULL, NULL);
1535 u = __ast_module_user_add(app->module, c);
1536 if (strcasecmp(app->name, "system") && !ast_strlen_zero(data) &&
1537 strchr(data, '|') && !strchr(data, ',') && !ast_opt_dont_warn) {
1538 ast_log(LOG_WARNING, "The application delimiter is now the comma, not "
1539 "the pipe. Did you forget to convert your dialplan? (%s(%s))\n",
1540 app->name, (char *) data);
1542 res = app->execute(c, S_OR(data, ""));
1543 if (app->module && u)
1544 __ast_module_user_remove(app->module, u);
1545 ast_cel_report_event(c, AST_CEL_APP_END, NULL, NULL, NULL);
1546 /* restore channel values */
1547 c->appl = saved_c_appl;
1548 c->data = saved_c_data;
1553 /*! Go no deeper than this through includes (not counting loops) */
1554 #define AST_PBX_MAX_STACK 128
1556 /*! \brief Find application handle in linked list
1558 struct ast_app *pbx_findapp(const char *app)
1560 struct ast_app *tmp;
1562 AST_RWLIST_RDLOCK(&apps);
1563 AST_RWLIST_TRAVERSE(&apps, tmp, list) {
1564 if (!strcasecmp(tmp->name, app))
1567 AST_RWLIST_UNLOCK(&apps);
1572 static struct ast_switch *pbx_findswitch(const char *sw)
1574 struct ast_switch *asw;
1576 AST_RWLIST_RDLOCK(&switches);
1577 AST_RWLIST_TRAVERSE(&switches, asw, list) {
1578 if (!strcasecmp(asw->name, sw))
1581 AST_RWLIST_UNLOCK(&switches);
1586 static inline int include_valid(struct ast_include *i)
1591 return ast_check_timing(&(i->timing));
1594 static void pbx_destroy(struct ast_pbx *p)
1599 /* form a tree that fully describes all the patterns in a context's extensions
1600 * in this tree, a "node" represents an individual character or character set
1601 * meant to match the corresponding character in a dial string. The tree
1602 * consists of a series of match_char structs linked in a chain
1603 * via the alt_char pointers. More than one pattern can share the same parts of the
1604 * tree as other extensions with the same pattern to that point.
1605 * My first attempt to duplicate the finding of the 'best' pattern was flawed in that
1606 * I misunderstood the general algorithm. I thought that the 'best' pattern
1607 * was the one with lowest total score. This was not true. Thus, if you have
1608 * patterns "1XXXXX" and "X11111", you would be tempted to say that "X11111" is
1609 * the "best" match because it has fewer X's, and is therefore more specific,
1610 * but this is not how the old algorithm works. It sorts matching patterns
1611 * in a similar collating sequence as sorting alphabetic strings, from left to
1612 * right. Thus, "1XXXXX" comes before "X11111", and would be the "better" match,
1613 * because "1" is more specific than "X".
1614 * So, to accomodate this philosophy, I sort the tree branches along the alt_char
1615 * line so they are lowest to highest in specificity numbers. This way, as soon
1616 * as we encounter our first complete match, we automatically have the "best"
1617 * match and can stop the traversal immediately. Same for CANMATCH/MATCHMORE.
1618 * If anyone would like to resurrect the "wrong" pattern trie searching algorithm,
1619 * they are welcome to revert pbx to before 1 Apr 2008.
1620 * As an example, consider these 4 extensions:
1626 * In the above, between (a) and (d), (a) is a more specific pattern than (d), and would win over
1627 * most numbers. For all numbers beginning with 307754, (b) should always win.
1629 * These pattern should form a (sorted) tree that looks like this:
1630 * { "3" } --next--> { "0" } --next--> { "7" } --next--> { "7" } --next--> { "5" } ... blah ... --> { "X" exten_match: (b) }
1634 * { "f" } --next--> { "a" } --next--> { "x" exten_match: (c) }
1635 * { "N" } --next--> { "X" } --next--> { "X" } --next--> { "N" } --next--> { "X" } ... blah ... --> { "X" exten_match: (a) }
1639 * | { "X" } --next--> { "X" } ... blah ... --> { "X" exten_match: (d) }
1643 * In the above, I could easily turn "N" into "23456789", but I think that a quick "if( *z >= '2' && *z <= '9' )" might take
1644 * fewer CPU cycles than a call to strchr("23456789",*z), where *z is the char to match...
1646 * traversal is pretty simple: one routine merely traverses the alt list, and for each matching char in the pattern, it calls itself
1647 * on the corresponding next pointer, incrementing also the pointer of the string to be matched, and passing the total specificity and length.
1648 * We pass a pointer to a scoreboard down through, also.
1649 * The scoreboard isn't as necessary to the revised algorithm, but I kept it as a handy way to return the matched extension.
1650 * The first complete match ends the traversal, which should make this version of the pattern matcher faster
1651 * the previous. The same goes for "CANMATCH" or "MATCHMORE"; the first such match ends the traversal. In both
1652 * these cases, the reason we can stop immediately, is because the first pattern match found will be the "best"
1653 * according to the sort criteria.
1654 * Hope the limit on stack depth won't be a problem... this routine should
1655 * be pretty lean as far a stack usage goes. Any non-match terminates the recursion down a branch.
1657 * In the above example, with the number "3077549999" as the pattern, the traversor could match extensions a, b and d. All are
1658 * of length 10; they have total specificities of 24580, 10246, and 25090, respectively, not that this matters
1659 * at all. (b) wins purely because the first character "3" is much more specific (lower specificity) than "N". I have
1660 * left the specificity totals in the code as an artifact; at some point, I will strip it out.
1662 * Just how much time this algorithm might save over a plain linear traversal over all possible patterns is unknown,
1663 * because it's a function of how many extensions are stored in a context. With thousands of extensions, the speedup
1664 * can be very noticeable. The new matching algorithm can run several hundreds of times faster, if not a thousand or
1665 * more times faster in extreme cases.
1667 * MatchCID patterns are also supported, and stored in the tree just as the extension pattern is. Thus, you
1668 * can have patterns in your CID field as well.
1673 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)
1675 /* if this extension is marked as deleted, then skip this -- if it never shows
1676 on the scoreboard, it will never be found, nor will halt the traversal. */
1679 board->total_specificity = spec;
1680 board->total_length = length;
1681 board->exten = exten;
1682 board->last_char = last;
1684 #ifdef NEED_DEBUG_HERE
1685 ast_log(LOG_NOTICE,"Scoreboarding (LONGER) %s, len=%d, score=%d\n", exten->exten, length, spec);
1690 static void log_match_char_tree(struct match_char *node, char *prefix)
1693 struct ast_str *my_prefix = ast_str_alloca(1024);
1697 if (node && node->exten)
1698 snprintf(extenstr, sizeof(extenstr), "(%p)", node->exten);
1700 if (strlen(node->x) > 1) {
1701 ast_debug(1, "%s[%s]:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N',
1702 node->deleted? 'D':'-', node->specificity, node->exten? "EXTEN:":"",
1703 node->exten ? node->exten->exten : "", extenstr);
1705 ast_debug(1, "%s%s:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N',
1706 node->deleted? 'D':'-', node->specificity, node->exten? "EXTEN:":"",
1707 node->exten ? node->exten->exten : "", extenstr);
1710 ast_str_set(&my_prefix, 0, "%s+ ", prefix);
1712 if (node->next_char)
1713 log_match_char_tree(node->next_char, ast_str_buffer(my_prefix));
1716 log_match_char_tree(node->alt_char, prefix);
1720 static void cli_match_char_tree(struct match_char *node, char *prefix, int fd)
1723 struct ast_str *my_prefix = ast_str_alloca(1024);
1727 if (node && node->exten)
1728 snprintf(extenstr, sizeof(extenstr), "(%p)", node->exten);
1730 if (strlen(node->x) > 1) {
1731 ast_cli(fd, "%s[%s]:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y' : 'N',
1732 node->deleted ? 'D' : '-', node->specificity, node->exten? "EXTEN:" : "",
1733 node->exten ? node->exten->exten : "", extenstr);
1735 ast_cli(fd, "%s%s:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y' : 'N',
1736 node->deleted ? 'D' : '-', node->specificity, node->exten? "EXTEN:" : "",
1737 node->exten ? node->exten->exten : "", extenstr);
1740 ast_str_set(&my_prefix, 0, "%s+ ", prefix);
1742 if (node->next_char)
1743 cli_match_char_tree(node->next_char, ast_str_buffer(my_prefix), fd);
1746 cli_match_char_tree(node->alt_char, prefix, fd);
1749 static struct ast_exten *get_canmatch_exten(struct match_char *node)
1751 /* find the exten at the end of the rope */
1752 struct match_char *node2 = node;
1754 for (node2 = node; node2; node2 = node2->next_char) {
1756 #ifdef NEED_DEBUG_HERE
1757 ast_log(LOG_NOTICE,"CanMatch_exten returns exten %s(%p)\n", node2->exten->exten, node2->exten);
1759 return node2->exten;
1762 #ifdef NEED_DEBUG_HERE
1763 ast_log(LOG_NOTICE,"CanMatch_exten returns NULL, match_char=%s\n", node->x);
1768 static struct ast_exten *trie_find_next_match(struct match_char *node)
1770 struct match_char *m3;
1771 struct match_char *m4;
1772 struct ast_exten *e3;
1774 if (node && node->x[0] == '.' && !node->x[1]) { /* dot and ! will ALWAYS be next match in a matchmore */
1778 if (node && node->x[0] == '!' && !node->x[1]) {
1782 if (!node || !node->next_char) {
1786 m3 = node->next_char;
1791 for (m4 = m3->alt_char; m4; m4 = m4->alt_char) {
1796 for (m4 = m3; m4; m4 = m4->alt_char) {
1797 e3 = trie_find_next_match(m3);
1807 static char *action2str(enum ext_match_t action)
1827 static void new_find_extension(const char *str, struct scoreboard *score, struct match_char *tree, int length, int spec, const char *callerid, const char *label, enum ext_match_t action)
1829 struct match_char *p; /* note minimal stack storage requirements */
1830 struct ast_exten pattern = { .label = label };
1833 ast_log(LOG_NOTICE,"new_find_extension called with %s on (sub)tree %s action=%s\n", str, tree->x, action2str(action));
1835 ast_log(LOG_NOTICE,"new_find_extension called with %s on (sub)tree NULL action=%s\n", str, action2str(action));
1837 for (p = tree; p; p = p->alt_char) {
1838 if (p->is_pattern) {
1839 if (p->x[0] == 'N') {
1840 if (p->x[1] == 0 && *str >= '2' && *str <= '9' ) {
1841 #define NEW_MATCHER_CHK_MATCH \
1842 if (p->exten && !(*(str + 1))) { /* if a shorter pattern matches along the way, might as well report it */ \
1843 if (action == E_MATCH || action == E_SPAWN || action == E_FINDLABEL) { /* if in CANMATCH/MATCHMORE, don't let matches get in the way */ \
1844 update_scoreboard(score, length + 1, spec + p->specificity, p->exten, 0, callerid, p->deleted, p); \
1845 if (!p->deleted) { \
1846 if (action == E_FINDLABEL) { \
1847 if (ast_hashtab_lookup(score->exten->peer_label_table, &pattern)) { \
1848 ast_debug(4, "Found label in preferred extension\n"); \
1852 ast_debug(4, "returning an exact match-- first found-- %s\n", p->exten->exten); \
1853 return; /* the first match, by definition, will be the best, because of the sorted tree */ \
1859 #define NEW_MATCHER_RECURSE \
1860 if (p->next_char && (*(str + 1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0) \
1861 || p->next_char->x[0] == '!')) { \
1862 if (*(str + 1) || p->next_char->x[0] == '!') { \
1863 new_find_extension(str + 1, score, p->next_char, length + 1, spec + p->specificity, callerid, label, action); \
1864 if (score->exten) { \
1865 ast_debug(4 ,"returning an exact match-- %s\n", score->exten->exten); \
1866 return; /* the first match is all we need */ \
1869 new_find_extension("/", score, p->next_char, length + 1, spec + p->specificity, callerid, label, action); \
1870 if (score->exten || ((action == E_CANMATCH || action == E_MATCHMORE) && score->canmatch)) { \
1871 ast_debug(4,"returning a (can/more) match--- %s\n", score->exten ? score->exten->exten : \
1873 return; /* the first match is all we need */ \
1876 } else if (p->next_char && !*(str + 1)) { \
1877 score->canmatch = 1; \
1878 score->canmatch_exten = get_canmatch_exten(p); \
1879 if (action == E_CANMATCH || action == E_MATCHMORE) { \
1880 ast_debug(4, "returning a canmatch/matchmore--- str=%s\n", str); \
1885 NEW_MATCHER_CHK_MATCH;
1886 NEW_MATCHER_RECURSE;
1888 } else if (p->x[0] == 'Z') {
1889 if (p->x[1] == 0 && *str >= '1' && *str <= '9' ) {
1890 NEW_MATCHER_CHK_MATCH;
1891 NEW_MATCHER_RECURSE;
1893 } else if (p->x[0] == 'X') {
1894 if (p->x[1] == 0 && *str >= '0' && *str <= '9' ) {
1895 NEW_MATCHER_CHK_MATCH;
1896 NEW_MATCHER_RECURSE;
1898 } else if (p->x[0] == '.' && p->x[1] == 0) {
1899 /* how many chars will the . match against? */
1901 const char *str2 = str;
1902 while (*str2 && *str2 != '/') {
1906 if (p->exten && *str2 != '/') {
1907 update_scoreboard(score, length + i, spec + (i * p->specificity), p->exten, '.', callerid, p->deleted, p);
1909 ast_debug(4,"return because scoreboard has a match with '/'--- %s\n", score->exten->exten);
1910 return; /* the first match is all we need */
1913 if (p->next_char && p->next_char->x[0] == '/' && p->next_char->x[1] == 0) {
1914 new_find_extension("/", score, p->next_char, length + i, spec+(p->specificity*i), callerid, label, action);
1915 if (score->exten || ((action == E_CANMATCH || action == E_MATCHMORE) && score->canmatch)) {
1916 ast_debug(4, "return because scoreboard has exact match OR CANMATCH/MATCHMORE & canmatch set--- %s\n", score->exten ? score->exten->exten : "NULL");
1917 return; /* the first match is all we need */
1920 } else if (p->x[0] == '!' && p->x[1] == 0) {
1921 /* how many chars will the . match against? */
1923 const char *str2 = str;
1924 while (*str2 && *str2 != '/') {
1928 if (p->exten && *str2 != '/') {
1929 update_scoreboard(score, length + 1, spec + (p->specificity * i), p->exten, '!', callerid, p->deleted, p);
1931 ast_debug(4, "return because scoreboard has a '!' match--- %s\n", score->exten->exten);
1932 return; /* the first match is all we need */
1935 if (p->next_char && p->next_char->x[0] == '/' && p->next_char->x[1] == 0) {
1936 new_find_extension("/", score, p->next_char, length + i, spec + (p->specificity * i), callerid, label, action);
1937 if (score->exten || ((action == E_CANMATCH || action == E_MATCHMORE) && score->canmatch)) {
1938 ast_debug(4, "return because scoreboard has exact match OR CANMATCH/MATCHMORE & canmatch set with '/' and '!'--- %s\n", score->exten ? score->exten->exten : "NULL");
1939 return; /* the first match is all we need */
1942 } else if (p->x[0] == '/' && p->x[1] == 0) {
1943 /* the pattern in the tree includes the cid match! */
1944 if (p->next_char && callerid && *callerid) {
1945 new_find_extension(callerid, score, p->next_char, length + 1, spec, callerid, label, action);
1946 if (score->exten || ((action == E_CANMATCH || action == E_MATCHMORE) && score->canmatch)) {
1947 ast_debug(4, "return because scoreboard has exact match OR CANMATCH/MATCHMORE & canmatch set with '/'--- %s\n", score->exten ? score->exten->exten : "NULL");
1948 return; /* the first match is all we need */
1951 } else if (strchr(p->x, *str)) {
1952 ast_debug(4, "Nothing strange about this match\n");
1953 NEW_MATCHER_CHK_MATCH;
1954 NEW_MATCHER_RECURSE;
1956 } else if (strchr(p->x, *str)) {
1957 ast_debug(4, "Nothing strange about this match\n");
1958 NEW_MATCHER_CHK_MATCH;
1959 NEW_MATCHER_RECURSE;
1962 ast_debug(4, "return at end of func\n");
1965 /* the algorithm for forming the extension pattern tree is also a bit simple; you
1966 * traverse all the extensions in a context, and for each char of the extension,
1967 * you see if it exists in the tree; if it doesn't, you add it at the appropriate
1968 * spot. What more can I say? At the end of each exten, you cap it off by adding the
1969 * address of the extension involved. Duplicate patterns will be complained about.
1971 * Ideally, this would be done for each context after it is created and fully
1972 * filled. It could be done as a finishing step after extensions.conf or .ael is
1973 * loaded, or it could be done when the first search is encountered. It should only
1974 * have to be done once, until the next unload or reload.
1976 * I guess forming this pattern tree would be analogous to compiling a regex. Except
1977 * that a regex only handles 1 pattern, really. This trie holds any number
1978 * of patterns. Well, really, it **could** be considered a single pattern,
1979 * where the "|" (or) operator is allowed, I guess, in a way, sort of...
1982 static struct match_char *already_in_tree(struct match_char *current, char *pat, int is_pattern)
1984 struct match_char *t;
1990 for (t = current; t; t = t->alt_char) {
1991 if (is_pattern == t->is_pattern && !strcmp(pat, t->x)) {/* uh, we may want to sort exploded [] contents to make matching easy */
1999 /* The first arg is the location of the tree ptr, or the
2000 address of the next_char ptr in the node, so we can mess
2001 with it, if we need to insert at the beginning of the list */
2003 static void insert_in_next_chars_alt_char_list(struct match_char **parent_ptr, struct match_char *node)
2005 struct match_char *curr, *lcurr;
2007 /* insert node into the tree at "current", so the alt_char list from current is
2008 sorted in increasing value as you go to the leaves */
2009 if (!(*parent_ptr)) {
2014 if ((*parent_ptr)->specificity > node->specificity) {
2015 /* insert at head */
2016 node->alt_char = (*parent_ptr);
2021 lcurr = *parent_ptr;
2022 for (curr = (*parent_ptr)->alt_char; curr; curr = curr->alt_char) {
2023 if (curr->specificity > node->specificity) {
2024 node->alt_char = curr;
2025 lcurr->alt_char = node;
2032 lcurr->alt_char = node;
2037 static struct match_char *add_pattern_node(struct ast_context *con, struct match_char *current, char *pattern, int is_pattern, int already, int specificity, struct match_char **nextcharptr)
2039 struct match_char *m;
2041 if (!(m = ast_calloc(1, sizeof(*m) + strlen(pattern)))) {
2045 /* strcpy is safe here since we know its size and have allocated
2046 * just enough space for when we allocated m
2048 strcpy(m->x, pattern);
2050 /* the specificity scores are the same as used in the old
2052 m->is_pattern = is_pattern;
2053 if (specificity == 1 && is_pattern && pattern[0] == 'N')
2054 m->specificity = 0x0832;
2055 else if (specificity == 1 && is_pattern && pattern[0] == 'Z')
2056 m->specificity = 0x0931;
2057 else if (specificity == 1 && is_pattern && pattern[0] == 'X')
2058 m->specificity = 0x0a30;
2059 else if (specificity == 1 && is_pattern && pattern[0] == '.')
2060 m->specificity = 0x18000;
2061 else if (specificity == 1 && is_pattern && pattern[0] == '!')
2062 m->specificity = 0x28000;
2064 m->specificity = specificity;
2066 if (!con->pattern_tree) {
2067 insert_in_next_chars_alt_char_list(&con->pattern_tree, m);
2069 if (already) { /* switch to the new regime (traversing vs appending)*/
2070 insert_in_next_chars_alt_char_list(nextcharptr, m);
2072 insert_in_next_chars_alt_char_list(¤t->next_char, m);
2079 static struct match_char *add_exten_to_pattern_tree(struct ast_context *con, struct ast_exten *e1, int findonly)
2081 struct match_char *m1 = NULL, *m2 = NULL, **m0;
2087 char *s1 = extenbuf;
2088 int l1 = strlen(e1->exten) + strlen(e1->cidmatch) + 2;
2091 ast_copy_string(extenbuf, e1->exten, sizeof(extenbuf));
2093 if (e1->matchcid && l1 <= sizeof(extenbuf)) {
2094 strcat(extenbuf, "/");
2095 strcat(extenbuf, e1->cidmatch);
2096 } else if (l1 > sizeof(extenbuf)) {
2097 ast_log(LOG_ERROR, "The pattern %s/%s is too big to deal with: it will be ignored! Disaster!\n", e1->exten, e1->cidmatch);
2101 ast_debug(1, "Adding exten %s%c%s to tree\n", s1, e1->matchcid ? '/' : ' ', e1->matchcid ? e1->cidmatch : "");
2103 m1 = con->pattern_tree; /* each pattern starts over at the root of the pattern tree */
2104 m0 = &con->pattern_tree;
2112 if (pattern && *s1 == '[' && *(s1 - 1) != '\\') {
2115 s1++; /* get past the '[' */
2116 while (*s1 != ']' && *(s1 - 1) != '\\') {
2118 if (*(s1 + 1) == ']') {
2121 } else if (*(s1 + 1) == '\\') {
2124 } else if (*(s1 + 1) == '-') {
2127 } else if (*(s1 + 1) == '[') {
2131 } else if (*s1 == '-') { /* remember to add some error checking to all this! */
2132 char s3 = *(s1 - 1);
2133 char s4 = *(s1 + 1);
2134 for (s3++; s3 <= s4; s3++) {
2138 } else if (*s1 == '\0') {
2139 ast_log(LOG_WARNING, "A matching ']' was not found for '[' in pattern string '%s'\n", extenbuf);
2145 *s2 = 0; /* null terminate the exploded range */
2146 /* sort the characters */
2148 specif = strlen(buf);
2149 qsort(buf, specif, 1, compare_char);
2152 } else if (*s1 == '-') {
2153 /* Skip dashes in patterns */
2162 if (*s1 == 'n') { /* make sure n,x,z patterns are canonicalized to N,X,Z */
2164 } else if (*s1 == 'x') {
2166 } else if (*s1 == 'z') {
2176 if (already && (m2 = already_in_tree(m1, buf, pattern)) && m2->next_char) {
2177 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...
2178 a shorter pattern might win if the longer one doesn't match */
2180 ast_log(LOG_WARNING, "Found duplicate exten. Had %s found %s\n", m2->exten->exten, e1->exten);
2185 m1 = m2->next_char; /* m1 points to the node to compare against */
2186 m0 = &m2->next_char; /* m0 points to the ptr that points to m1 */
2187 } else { /* not already OR not m2 OR nor m2->next_char */
2192 m1 = m2; /* while m0 stays the same */
2197 if (!(m1 = add_pattern_node(con, m1, buf, pattern, already,specif, m0))) { /* m1 is the node just added */
2200 m0 = &m1->next_char;
2203 if (m2 && m2->exten) {
2204 ast_log(LOG_WARNING, "Found duplicate exten. Had %s found %s\n", m2->exten->exten, e1->exten);
2210 /* The 'already' variable is a mini-optimization designed to make it so that we
2211 * don't have to call already_in_tree when we know it will return false.
2215 s1++; /* advance to next char */
2220 static void create_match_char_tree(struct ast_context *con)
2222 struct ast_hashtab_iter *t1;
2223 struct ast_exten *e1;
2225 int biggest_bucket, resizes, numobjs, numbucks;
2227 ast_debug(1, "Creating Extension Trie for context %s(%p)\n", con->name, con);
2228 ast_hashtab_get_stats(con->root_table, &biggest_bucket, &resizes, &numobjs, &numbucks);
2229 ast_debug(1, "This tree has %d objects in %d bucket lists, longest list=%d objects, and has resized %d times\n",
2230 numobjs, numbucks, biggest_bucket, resizes);
2232 t1 = ast_hashtab_start_traversal(con->root_table);
2233 while ((e1 = ast_hashtab_next(t1))) {
2235 add_exten_to_pattern_tree(con, e1, 0);
2237 ast_log(LOG_ERROR, "Attempt to create extension with no extension name.\n");
2240 ast_hashtab_end_traversal(t1);
2243 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! */
2245 /* destroy all the alternates */
2246 if (pattern_tree->alt_char) {
2247 destroy_pattern_tree(pattern_tree->alt_char);
2248 pattern_tree->alt_char = 0;
2250 /* destroy all the nexts */
2251 if (pattern_tree->next_char) {
2252 destroy_pattern_tree(pattern_tree->next_char);
2253 pattern_tree->next_char = 0;
2255 pattern_tree->exten = 0; /* never hurts to make sure there's no pointers laying around */
2256 ast_free(pattern_tree);
2260 * Special characters used in patterns:
2261 * '_' underscore is the leading character of a pattern.
2262 * In other position it is treated as a regular char.
2263 * . one or more of any character. Only allowed at the end of
2265 * ! zero or more of anything. Also impacts the result of CANMATCH
2266 * and MATCHMORE. Only allowed at the end of a pattern.
2267 * In the core routine, ! causes a match with a return code of 2.
2268 * In turn, depending on the search mode: (XXX check if it is implemented)
2269 * - E_MATCH retuns 1 (does match)
2270 * - E_MATCHMORE returns 0 (no match)
2271 * - E_CANMATCH returns 1 (does match)
2273 * / should not appear as it is considered the separator of the CID info.
2274 * XXX at the moment we may stop on this char.
2276 * X Z N match ranges 0-9, 1-9, 2-9 respectively.
2277 * [ denotes the start of a set of character. Everything inside
2278 * is considered literally. We can have ranges a-d and individual
2279 * characters. A '[' and '-' can be considered literally if they
2280 * are just before ']'.
2281 * XXX currently there is no way to specify ']' in a range, nor \ is
2282 * considered specially.
2284 * When we compare a pattern with a specific extension, all characters in the extension
2285 * itself are considered literally.
2286 * XXX do we want to consider space as a separator as well ?
2287 * XXX do we want to consider the separators in non-patterns as well ?
2291 * \brief helper functions to sort extensions and patterns in the desired way,
2292 * so that more specific patterns appear first.
2294 * ext_cmp1 compares individual characters (or sets of), returning
2295 * an int where bits 0-7 are the ASCII code of the first char in the set,
2296 * while bit 8-15 are the cardinality of the set minus 1.
2297 * This way more specific patterns (smaller cardinality) appear first.
2298 * Wildcards have a special value, so that we can directly compare them to
2299 * sets by subtracting the two values. In particular:
2300 * 0x000xx one character, xx
2301 * 0x0yyxx yy character set starting with xx
2302 * 0x10000 '.' (one or more of anything)
2303 * 0x20000 '!' (zero or more of anything)
2304 * 0x30000 NUL (end of string)
2305 * 0x40000 error in set.
2306 * The pointer to the string is advanced according to needs.
2308 * 1. the empty set is equivalent to NUL.
2309 * 2. given that a full set has always 0 as the first element,
2310 * we could encode the special cases as 0xffXX where XX
2311 * is 1, 2, 3, 4 as used above.
2313 static int ext_cmp1(const char **p, unsigned char *bitwise)
2315 int c, cmin = 0xff, count = 0;
2318 /* load value and advance pointer */
2321 /* always return unless we have a set of chars */
2322 switch (toupper(c)) {
2323 default: /* ordinary character */
2324 bitwise[c / 8] = 1 << (c % 8);
2325 return 0x0100 | (c & 0xff);
2327 case 'N': /* 2..9 */
2330 return 0x0800 | '2';
2332 case 'X': /* 0..9 */
2335 return 0x0A00 | '0';
2337 case 'Z': /* 1..9 */
2340 return 0x0900 | '1';
2342 case '.': /* wildcard */
2345 case '!': /* earlymatch */
2346 return 0x28000; /* less specific than NULL */
2348 case '\0': /* empty string */
2352 case '[': /* pattern */
2355 /* locate end of set */
2356 end = strchr(*p, ']');
2359 ast_log(LOG_WARNING, "Wrong usage of [] in the extension\n");
2360 return 0x40000; /* XXX make this entry go last... */
2363 for (; *p < end ; (*p)++) {
2364 unsigned char c1, c2; /* first-last char in range */
2365 c1 = (unsigned char)((*p)[0]);
2366 if (*p + 2 < end && (*p)[1] == '-') { /* this is a range */
2367 c2 = (unsigned char)((*p)[2]);
2368 *p += 2; /* skip a total of 3 chars */
2369 } else { /* individual character */
2375 for (; c1 <= c2; c1++) {
2376 unsigned char mask = 1 << (c1 % 8);
2377 /*!\note If two patterns score the same, the one with the lowest
2378 * ascii values will compare as coming first. */
2379 /* Flag the character as included (used) and count it. */
2380 if (!(bitwise[ c1 / 8 ] & mask)) {
2381 bitwise[ c1 / 8 ] |= mask;
2387 return count == 0 ? 0x30000 : (count | cmin);
2391 * \brief the full routine to compare extensions in rules.
2393 static int ext_cmp(const char *a, const char *b)
2395 /* make sure non-patterns come first.
2396 * If a is not a pattern, it either comes first or
2397 * we do a more complex pattern comparison.
2402 return (b[0] == '_') ? -1 : strcmp(a, b);
2404 /* Now we know a is a pattern; if b is not, a comes first */
2408 /* ok we need full pattern sorting routine.
2409 * skip past the underscores */
2412 unsigned char bitwise[2][32] = { { 0, } };
2413 ret = ext_cmp1(&a, bitwise[0]) - ext_cmp1(&b, bitwise[1]);
2415 /* Are the classes different, even though they score the same? */
2416 ret = memcmp(bitwise[0], bitwise[1], 32);
2418 } while (!ret && a && b);
2422 return (ret > 0) ? 1 : -1;
2426 int ast_extension_cmp(const char *a, const char *b)
2428 return ext_cmp(a, b);
2433 * \brief used ast_extension_{match|close}
2434 * mode is as follows:
2435 * E_MATCH success only on exact match
2436 * E_MATCHMORE success only on partial match (i.e. leftover digits in pattern)
2437 * E_CANMATCH either of the above.
2438 * \retval 0 on no-match
2439 * \retval 1 on match
2440 * \retval 2 on early match.
2443 static int _extension_match_core(const char *pattern, const char *data, enum ext_match_t mode)
2445 mode &= E_MATCH_MASK; /* only consider the relevant bits */
2447 #ifdef NEED_DEBUG_HERE
2448 ast_log(LOG_NOTICE,"match core: pat: '%s', dat: '%s', mode=%d\n", pattern, data, (int)mode);
2451 if ( (mode == E_MATCH) && (pattern[0] == '_') && (!strcasecmp(pattern,data)) ) { /* note: if this test is left out, then _x. will not match _x. !!! */
2452 #ifdef NEED_DEBUG_HERE
2453 ast_log(LOG_NOTICE,"return (1) - pattern matches pattern\n");
2458 if (pattern[0] != '_') { /* not a pattern, try exact or partial match */
2459 int ld = strlen(data), lp = strlen(pattern);
2461 if (lp < ld) { /* pattern too short, cannot match */
2462 #ifdef NEED_DEBUG_HERE
2463 ast_log(LOG_NOTICE,"return (0) - pattern too short, cannot match\n");
2467 /* depending on the mode, accept full or partial match or both */
2468 if (mode == E_MATCH) {
2469 #ifdef NEED_DEBUG_HERE
2470 ast_log(LOG_NOTICE,"return (!strcmp(%s,%s) when mode== E_MATCH)\n", pattern, data);
2472 return !strcmp(pattern, data); /* 1 on match, 0 on fail */
2474 if (ld == 0 || !strncasecmp(pattern, data, ld)) { /* partial or full match */
2475 #ifdef NEED_DEBUG_HERE
2476 ast_log(LOG_NOTICE,"return (mode(%d) == E_MATCHMORE ? lp(%d) > ld(%d) : 1)\n", mode, lp, ld);
2478 return (mode == E_MATCHMORE) ? lp > ld : 1; /* XXX should consider '!' and '/' ? */
2480 #ifdef NEED_DEBUG_HERE
2481 ast_log(LOG_NOTICE,"return (0) when ld(%d) > 0 && pattern(%s) != data(%s)\n", ld, pattern, data);
2486 pattern++; /* skip leading _ */
2488 * XXX below we stop at '/' which is a separator for the CID info. However we should
2489 * not store '/' in the pattern at all. When we insure it, we can remove the checks.
2491 while (*data && *pattern && *pattern != '/') {
2494 if (*data == '-') { /* skip '-' in data (just a separator) */
2498 switch (toupper(*pattern)) {
2499 case '[': /* a range */
2500 end = strchr(pattern+1, ']'); /* XXX should deal with escapes ? */
2502 ast_log(LOG_WARNING, "Wrong usage of [] in the extension\n");
2503 return 0; /* unconditional failure */
2505 for (pattern++; pattern != end; pattern++) {
2506 if (pattern+2 < end && pattern[1] == '-') { /* this is a range */
2507 if (*data >= pattern[0] && *data <= pattern[2])
2508 break; /* match found */
2510 pattern += 2; /* skip a total of 3 chars */
2513 } else if (*data == pattern[0])
2514 break; /* match found */
2516 if (pattern == end) {
2517 #ifdef NEED_DEBUG_HERE
2518 ast_log(LOG_NOTICE,"return (0) when pattern==end\n");
2522 pattern = end; /* skip and continue */
2525 if (*data < '2' || *data > '9') {
2526 #ifdef NEED_DEBUG_HERE
2527 ast_log(LOG_NOTICE,"return (0) N is matched\n");
2533 if (*data < '0' || *data > '9') {
2534 #ifdef NEED_DEBUG_HERE
2535 ast_log(LOG_NOTICE,"return (0) X is matched\n");
2541 if (*data < '1' || *data > '9') {
2542 #ifdef NEED_DEBUG_HERE
2543 ast_log(LOG_NOTICE,"return (0) Z is matched\n");
2548 case '.': /* Must match, even with more digits */
2549 #ifdef NEED_DEBUG_HERE
2550 ast_log(LOG_NOTICE, "return (1) when '.' is matched\n");
2553 case '!': /* Early match */
2554 #ifdef NEED_DEBUG_HERE
2555 ast_log(LOG_NOTICE, "return (2) when '!' is matched\n");
2559 case '-': /* Ignore these in patterns */
2560 data--; /* compensate the final data++ */
2563 if (*data != *pattern) {
2564 #ifdef NEED_DEBUG_HERE
2565 ast_log(LOG_NOTICE, "return (0) when *data(%c) != *pattern(%c)\n", *data, *pattern);
2573 if (*data) /* data longer than pattern, no match */ {
2574 #ifdef NEED_DEBUG_HERE
2575 ast_log(LOG_NOTICE, "return (0) when data longer than pattern\n");
2581 * match so far, but ran off the end of the data.
2582 * Depending on what is next, determine match or not.
2584 if (*pattern == '\0' || *pattern == '/') { /* exact match */
2585 #ifdef NEED_DEBUG_HERE
2586 ast_log(LOG_NOTICE, "at end, return (%d) in 'exact match'\n", (mode==E_MATCHMORE) ? 0 : 1);
2588 return (mode == E_MATCHMORE) ? 0 : 1; /* this is a failure for E_MATCHMORE */
2589 } else if (*pattern == '!') { /* early match */
2590 #ifdef NEED_DEBUG_HERE
2591 ast_log(LOG_NOTICE, "at end, return (2) when '!' is matched\n");
2594 } else { /* partial match */
2595 #ifdef NEED_DEBUG_HERE
2596 ast_log(LOG_NOTICE, "at end, return (%d) which deps on E_MATCH\n", (mode == E_MATCH) ? 0 : 1);
2598 return (mode == E_MATCH) ? 0 : 1; /* this is a failure for E_MATCH */
2603 * Wrapper around _extension_match_core() to do performance measurement
2604 * using the profiling code.
2606 static int extension_match_core(const char *pattern, const char *data, enum ext_match_t mode)
2609 static int prof_id = -2; /* marker for 'unallocated' id */
2610 if (prof_id == -2) {
2611 prof_id = ast_add_profile("ext_match", 0);
2613 ast_mark(prof_id, 1);
2614 i = _extension_match_core(pattern, data, mode);
2615 ast_mark(prof_id, 0);
2619 int ast_extension_match(const char *pattern, const char *data)
2621 return extension_match_core(pattern, data, E_MATCH);
2624 int ast_extension_close(const char *pattern, const char *data, int needmore)
2626 if (needmore != E_MATCHMORE && needmore != E_CANMATCH)
2627 ast_log(LOG_WARNING, "invalid argument %d\n", needmore);
2628 return extension_match_core(pattern, data, needmore);
2631 struct fake_context /* this struct is purely for matching in the hashtab */
2634 struct ast_exten *root;
2635 struct ast_hashtab *root_table;
2636 struct match_char *pattern_tree;
2637 struct ast_context *next;
2638 struct ast_include *includes;
2639 struct ast_ignorepat *ignorepats;
2640 const char *registrar;
2642 AST_LIST_HEAD_NOLOCK(, ast_sw) alts;
2643 ast_mutex_t macrolock;
2647 struct ast_context *ast_context_find(const char *name)
2649 struct ast_context *tmp;
2650 struct fake_context item;
2655 ast_rdlock_contexts();
2656 if (contexts_table) {
2657 ast_copy_string(item.name, name, sizeof(item.name));
2658 tmp = ast_hashtab_lookup(contexts_table, &item);
2661 while ((tmp = ast_walk_contexts(tmp))) {
2662 if (!strcasecmp(name, tmp->name)) {
2667 ast_unlock_contexts();
2671 #define STATUS_NO_CONTEXT 1
2672 #define STATUS_NO_EXTENSION 2
2673 #define STATUS_NO_PRIORITY 3
2674 #define STATUS_NO_LABEL 4
2675 #define STATUS_SUCCESS 5
2677 static int matchcid(const char *cidpattern, const char *callerid)
2679 /* If the Caller*ID pattern is empty, then we're matching NO Caller*ID, so
2680 failing to get a number should count as a match, otherwise not */
2682 if (ast_strlen_zero(callerid)) {
2683 return ast_strlen_zero(cidpattern) ? 1 : 0;
2686 return ast_extension_match(cidpattern, callerid);
2689 struct ast_exten *pbx_find_extension(struct ast_channel *chan,
2690 struct ast_context *bypass, struct pbx_find_info *q,
2691 const char *context, const char *exten, int priority,
2692 const char *label, const char *callerid, enum ext_match_t action)
2695 struct ast_context *tmp = NULL;
2696 struct ast_exten *e = NULL, *eroot = NULL;
2697 struct ast_include *i = NULL;
2698 struct ast_sw *sw = NULL;
2699 struct ast_exten pattern = {NULL, };
2700 struct scoreboard score = {0, };
2701 struct ast_str *tmpdata = NULL;
2703 pattern.label = label;
2704 pattern.priority = priority;
2705 #ifdef NEED_DEBUG_HERE
2706 ast_log(LOG_NOTICE, "Looking for cont/ext/prio/label/action = %s/%s/%d/%s/%d\n", context, exten, priority, label, (int) action);
2709 /* Initialize status if appropriate */
2710 if (q->stacklen == 0) {
2711 q->status = STATUS_NO_CONTEXT;
2714 q->foundcontext = NULL;
2715 } else if (q->stacklen >= AST_PBX_MAX_STACK) {
2716 ast_log(LOG_WARNING, "Maximum PBX stack exceeded\n");
2720 /* Check first to see if we've already been checked */
2721 for (x = 0; x < q->stacklen; x++) {
2722 if (!strcasecmp(q->incstack[x], context))
2726 if (bypass) { /* bypass means we only look there */
2728 } else { /* look in contexts */
2729 tmp = find_context(context);
2735 if (q->status < STATUS_NO_EXTENSION)
2736 q->status = STATUS_NO_EXTENSION;
2738 /* Do a search for matching extension */
2741 score.total_specificity = 0;
2743 score.total_length = 0;
2744 if (!tmp->pattern_tree && tmp->root_table) {
2745 create_match_char_tree(tmp);
2747 ast_debug(1, "Tree Created in context %s:\n", context);
2748 log_match_char_tree(tmp->pattern_tree," ");
2752 ast_log(LOG_NOTICE, "The Trie we are searching in:\n");
2753 log_match_char_tree(tmp->pattern_tree, ":: ");
2757 if (!ast_strlen_zero(overrideswitch)) {
2758 char *osw = ast_strdupa(overrideswitch), *name;
2759 struct ast_switch *asw;
2760 ast_switch_f *aswf = NULL;
2764 name = strsep(&osw, "/");
2765 asw = pbx_findswitch(name);
2768 ast_log(LOG_WARNING, "No such switch '%s'\n", name);
2772 if (osw && strchr(osw, '$')) {
2776 if (eval && !(tmpdata = ast_str_thread_get(&switch_data, 512))) {
2777 ast_log(LOG_WARNING, "Can't evaluate overrideswitch?!");
2780 /* Substitute variables now */
2781 pbx_substitute_variables_helper(chan, osw, ast_str_buffer(tmpdata), ast_str_size(tmpdata));
2782 datap = ast_str_buffer(tmpdata);
2787 /* equivalent of extension_match_core() at the switch level */
2788 if (action == E_CANMATCH)
2789 aswf = asw->canmatch;
2790 else if (action == E_MATCHMORE)
2791 aswf = asw->matchmore;
2792 else /* action == E_MATCH */
2798 ast_autoservice_start(chan);
2800 res = aswf(chan, context, exten, priority, callerid, datap);
2802 ast_autoservice_stop(chan);
2805 if (res) { /* Got a match */
2808 q->foundcontext = context;
2809 /* XXX keep status = STATUS_NO_CONTEXT ? */
2815 if (extenpatternmatchnew) {
2816 new_find_extension(exten, &score, tmp->pattern_tree, 0, 0, callerid, label, action);
2817 eroot = score.exten;
2819 if (score.last_char == '!' && action == E_MATCHMORE) {
2820 /* We match an extension ending in '!'.
2821 * The decision in this case is final and is NULL (no match).
2823 #ifdef NEED_DEBUG_HERE
2824 ast_log(LOG_NOTICE,"Returning MATCHMORE NULL with exclamation point.\n");
2829 if (!eroot && (action == E_CANMATCH || action == E_MATCHMORE) && score.canmatch_exten) {
2830 q->status = STATUS_SUCCESS;
2831 #ifdef NEED_DEBUG_HERE
2832 ast_log(LOG_NOTICE,"Returning CANMATCH exten %s\n", score.canmatch_exten->exten);
2834 return score.canmatch_exten;
2837 if ((action == E_MATCHMORE || action == E_CANMATCH) && eroot) {
2839 struct ast_exten *z = trie_find_next_match(score.node);
2841 #ifdef NEED_DEBUG_HERE
2842 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE next_match exten %s\n", z->exten);
2845 if (score.canmatch_exten) {
2846 #ifdef NEED_DEBUG_HERE
2847 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE canmatchmatch exten %s(%p)\n", score.canmatch_exten->exten, score.canmatch_exten);
2849 return score.canmatch_exten;
2851 #ifdef NEED_DEBUG_HERE
2852 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE next_match exten NULL\n");
2858 #ifdef NEED_DEBUG_HERE
2859 ast_log(LOG_NOTICE, "Returning CANMATCH/MATCHMORE NULL (no next_match)\n");
2861 return NULL; /* according to the code, complete matches are null matches in MATCHMORE mode */
2865 /* found entry, now look for the right priority */
2866 if (q->status < STATUS_NO_PRIORITY)
2867 q->status = STATUS_NO_PRIORITY;
2869 if (action == E_FINDLABEL && label ) {
2870 if (q->status < STATUS_NO_LABEL)
2871 q->status = STATUS_NO_LABEL;
2872 e = ast_hashtab_lookup(eroot->peer_label_table, &pattern);
2874 e = ast_hashtab_lookup(eroot->peer_table, &pattern);
2876 if (e) { /* found a valid match */
2877 q->status = STATUS_SUCCESS;
2878 q->foundcontext = context;
2879 #ifdef NEED_DEBUG_HERE
2880 ast_log(LOG_NOTICE,"Returning complete match of exten %s\n", e->exten);
2885 } else { /* the old/current default exten pattern match algorithm */
2887 /* scan the list trying to match extension and CID */
2889 while ( (eroot = ast_walk_context_extensions(tmp, eroot)) ) {
2890 int match = extension_match_core(eroot->exten, exten, action);
2891 /* 0 on fail, 1 on match, 2 on earlymatch */
2893 if (!match || (eroot->matchcid && !matchcid(eroot->cidmatch, callerid)))
2894 continue; /* keep trying */
2895 if (match == 2 && action == E_MATCHMORE) {
2896 /* We match an extension ending in '!'.
2897 * The decision in this case is final and is NULL (no match).