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"
70 * \note I M P O R T A N T :
72 * The speed of extension handling will likely be among the most important
73 * aspects of this PBX. The switching scheme as it exists right now isn't
74 * terribly bad (it's O(N+M), where N is the # of extensions and M is the avg #
75 * of priorities, but a constant search time here would be great ;-)
77 * A new algorithm to do searching based on a 'compiled' pattern tree is introduced
78 * here, and shows a fairly flat (constant) search time, even for over
81 * Also, using a hash table for context/priority name lookup can help prevent
82 * the find_extension routines from absorbing exponential cpu cycles as the number
83 * of contexts/priorities grow. I've previously tested find_extension with red-black trees,
84 * which have O(log2(n)) speed. Right now, I'm using hash tables, which do
85 * searches (ideally) in O(1) time. While these techniques do not yield much
86 * speed in small dialplans, they are worth the trouble in large dialplans.
91 <application name="Answer" language="en_US">
93 Answer a channel if ringing.
96 <parameter name="delay">
97 <para>Asterisk will wait this number of milliseconds before returning to
98 the dialplan after answering the call.</para>
100 <parameter name="nocdr">
101 <para>Asterisk will send an answer signal to the calling phone, but will not
102 set the disposition or answer time in the CDR for this call.</para>
106 <para>If the call has not been answered, this application will
107 answer it. Otherwise, it has no effect on the call.</para>
110 <ref type="application">Hangup</ref>
113 <application name="BackGround" language="en_US">
115 Play an audio file while waiting for digits of an extension to go to.
118 <parameter name="filenames" required="true" argsep="&">
119 <argument name="filename1" required="true" />
120 <argument name="filename2" multiple="true" />
122 <parameter name="options">
125 <para>Causes the playback of the message to be skipped
126 if the channel is not in the <literal>up</literal> state (i.e. it
127 hasn't been answered yet). If this happens, the
128 application will return immediately.</para>
131 <para>Don't answer the channel before playing the files.</para>
134 <para>Only break if a digit hit matches a one digit
135 extension in the destination context.</para>
139 <parameter name="langoverride">
140 <para>Explicitly specifies which language to attempt to use for the requested sound files.</para>
142 <parameter name="context">
143 <para>This is the dialplan context that this application will use when exiting
144 to a dialed extension.</para>
148 <para>This application will play the given list of files <emphasis>(do not put extension)</emphasis>
149 while waiting for an extension to be dialed by the calling channel. To continue waiting
150 for digits after this application has finished playing files, the <literal>WaitExten</literal>
151 application should be used.</para>
152 <para>If one of the requested sound files does not exist, call processing will be terminated.</para>
153 <para>This application sets the following channel variable upon completion:</para>
155 <variable name="BACKGROUNDSTATUS">
156 <para>The status of the background attempt as a text string.</para>
157 <value name="SUCCESS" />
158 <value name="FAILED" />
163 <ref type="application">ControlPlayback</ref>
164 <ref type="application">WaitExten</ref>
165 <ref type="application">BackgroundDetect</ref>
166 <ref type="function">TIMEOUT</ref>
169 <application name="Busy" language="en_US">
171 Indicate the Busy condition.
174 <parameter name="timeout">
175 <para>If specified, the calling channel will be hung up after the specified number of seconds.
176 Otherwise, this application will wait until the calling channel hangs up.</para>
180 <para>This application will indicate the busy condition to the calling channel.</para>
183 <ref type="application">Congestion</ref>
184 <ref type="application">Progess</ref>
185 <ref type="application">Playtones</ref>
186 <ref type="application">Hangup</ref>
189 <application name="Congestion" language="en_US">
191 Indicate the Congestion condition.
194 <parameter name="timeout">
195 <para>If specified, the calling channel will be hung up after the specified number of seconds.
196 Otherwise, this application will wait until the calling channel hangs up.</para>
200 <para>This application will indicate the congestion condition to the calling channel.</para>
203 <ref type="application">Busy</ref>
204 <ref type="application">Progess</ref>
205 <ref type="application">Playtones</ref>
206 <ref type="application">Hangup</ref>
209 <application name="ExecIfTime" language="en_US">
211 Conditional application execution based on the current time.
214 <parameter name="day_condition" required="true">
215 <argument name="times" required="true" />
216 <argument name="weekdays" required="true" />
217 <argument name="mdays" required="true" />
218 <argument name="months" required="true" />
219 <argument name="timezone" required="false" />
221 <parameter name="appname" required="true" hasparams="optional">
222 <argument name="appargs" required="true" />
226 <para>This application will execute the specified dialplan application, with optional
227 arguments, if the current time matches the given time specification.</para>
230 <ref type="application">Exec</ref>
231 <ref type="application">TryExec</ref>
234 <application name="Goto" language="en_US">
236 Jump to a particular priority, extension, or context.
239 <parameter name="context" />
240 <parameter name="extensions" />
241 <parameter name="priority" required="true" />
244 <para>This application will set the current context, extension, and priority in the channel structure.
245 After it completes, the pbx engine will continue dialplan execution at the specified location.
246 If no specific <replaceable>extension</replaceable>, or <replaceable>extension</replaceable> and
247 <replaceable>context</replaceable>, are specified, then this application will
248 just set the specified <replaceable>priority</replaceable> of the current extension.</para>
249 <para>At least a <replaceable>priority</replaceable> is required as an argument, or the goto will
250 return a <literal>-1</literal>, and the channel and call will be terminated.</para>
251 <para>If the location that is put into the channel information is bogus, and asterisk cannot
252 find that location in the dialplan, then the execution engine will try to find and execute the code in
253 the <literal>i</literal> (invalid) extension in the current context. If that does not exist, it will try to execute the
254 <literal>h</literal> extension. If either or neither the <literal>h</literal> or <literal>i</literal> extensions
255 have been defined, the channel is hung up, and the execution of instructions on the channel is terminated.
256 What this means is that, for example, you specify a context that does not exist, then
257 it will not be possible to find the <literal>h</literal> or <literal>i</literal> extensions,
258 and the call will terminate!</para>
261 <ref type="application">GotoIf</ref>
262 <ref type="application">GotoIfTime</ref>
263 <ref type="application">Gosub</ref>
264 <ref type="application">Macro</ref>
267 <application name="GotoIf" language="en_US">
272 <parameter name="condition" required="true" />
273 <parameter name="destination" required="true" argsep=":">
274 <argument name="labeliftrue">
275 <para>Continue at <replaceable>labeliftrue</replaceable> if the condition is true.</para>
277 <argument name="labeliffalse">
278 <para>Continue at <replaceable>labeliffalse</replaceable> if the condition is false.</para>
283 <para>This application will set the current context, extension, and priority in the channel structure
284 based on the evaluation of the given condition. After this application completes, the
285 pbx engine will continue dialplan execution at the specified location in the dialplan.
286 The labels are specified with the same syntax as used within the Goto application.
287 If the label chosen by the condition is omitted, no jump is performed, and the execution passes to the
288 next instruction. If the target location is bogus, and does not exist, the execution engine will try
289 to find and execute the code in the <literal>i</literal> (invalid) extension in the current context.
290 If that does not exist, it will try to execute the <literal>h</literal> extension.
291 If either or neither the <literal>h</literal> or <literal>i</literal> extensions have been defined,
292 the channel is hung up, and the execution of instructions on the channel is terminated.
293 Remember that this command can set the current context, and if the context specified
294 does not exist, then it will not be able to find any 'h' or 'i' extensions there, and
295 the channel and call will both be terminated!.</para>
298 <ref type="application">Goto</ref>
299 <ref type="application">GotoIfTime</ref>
300 <ref type="application">GosubIf</ref>
301 <ref type="application">MacroIf</ref>
304 <application name="GotoIfTime" language="en_US">
306 Conditional Goto based on the current time.
309 <parameter name="condition" required="true">
310 <argument name="times" required="true" />
311 <argument name="weekdays" required="true" />
312 <argument name="mdays" required="true" />
313 <argument name="months" required="true" />
314 <argument name="timezone" required="false" />
316 <parameter name="destination" required="true" argsep=":">
317 <argument name="labeliftrue" />
318 <argument name="labeliffalse" />
322 <para>This application will set the context, extension, and priority in the channel structure
323 based on the evaluation of the given time specification. After this application completes,
324 the pbx engine will continue dialplan execution at the specified location in the dialplan.
325 If the current time is within the given time specification, the channel will continue at
326 <replaceable>labeliftrue</replaceable>. Otherwise the channel will continue at <replaceable>labeliffalse</replaceable>.
327 If the label chosen by the condition is omitted, no jump is performed, and execution passes to the next
328 instruction. If the target jump location is bogus, the same actions would be taken as for <literal>Goto</literal>.
329 Further information on the time specification can be found in examples
330 illustrating how to do time-based context includes in the dialplan.</para>
333 <ref type="application">GotoIf</ref>
334 <ref type="function">IFTIME</ref>
337 <application name="ImportVar" language="en_US">
339 Import a variable from a channel into a new variable.
342 <parameter name="newvar" required="true" />
343 <parameter name="vardata" required="true">
344 <argument name="channelname" required="true" />
345 <argument name="variable" required="true" />
349 <para>This application imports a <replaceable>variable</replaceable> from the specified
350 <replaceable>channel</replaceable> (as opposed to the current one) and stores it as a variable
351 (<replaceable>newvar</replaceable>) in the current channel (the channel that is calling this
352 application). Variables created by this application have the same inheritance properties as those
353 created with the <literal>Set</literal> application.</para>
356 <ref type="application">Set</ref>
359 <application name="Hangup" language="en_US">
361 Hang up the calling channel.
364 <parameter name="causecode">
365 <para>If a <replaceable>causecode</replaceable> is given the channel's
366 hangup cause will be set to the given value.</para>
370 <para>This application will hang up the calling channel.</para>
373 <ref type="application">Answer</ref>
374 <ref type="application">Busy</ref>
375 <ref type="application">Congestion</ref>
378 <application name="Incomplete" language="en_US">
380 Returns AST_PBX_INCOMPLETE value.
384 <para>If specified, then Incomplete will not attempt to answer the channel first.</para>
385 <note><para>Most channel types need to be in Answer state in order to receive DTMF.</para></note>
389 <para>Signals the PBX routines that the previous matched extension is incomplete
390 and that further input should be allowed before matching can be considered
391 to be complete. Can be used within a pattern match when certain criteria warrants
392 a longer match.</para>
395 <application name="NoOp" language="en_US">
397 Do Nothing (No Operation).
400 <parameter name="text">
401 <para>Any text provided can be viewed at the Asterisk CLI.</para>
405 <para>This application does nothing. However, it is useful for debugging purposes.</para>
406 <para>This method can be used to see the evaluations of variables or functions without having any effect.</para>
409 <ref type="application">Verbose</ref>
410 <ref type="application">Log</ref>
413 <application name="Proceeding" language="en_US">
419 <para>This application will request that a proceeding message be provided to the calling channel.</para>
422 <application name="Progress" language="en_US">
428 <para>This application will request that in-band progress information be provided to the calling channel.</para>
431 <ref type="application">Busy</ref>
432 <ref type="application">Congestion</ref>
433 <ref type="application">Ringing</ref>
434 <ref type="application">Playtones</ref>
437 <application name="RaiseException" language="en_US">
439 Handle an exceptional condition.
442 <parameter name="reason" required="true" />
445 <para>This application will jump to the <literal>e</literal> extension in the current context, setting the
446 dialplan function EXCEPTION(). If the <literal>e</literal> extension does not exist, the call will hangup.</para>
449 <ref type="function">Exception</ref>
452 <application name="ResetCDR" language="en_US">
454 Resets the Call Data Record.
457 <parameter name="options">
460 <para>Store the current CDR record before resetting it.</para>
463 <para>Store any stacked records.</para>
466 <para>Save CDR variables.</para>
469 <para>Enable CDR only (negate effects of NoCDR).</para>
475 <para>This application causes the Call Data Record to be reset.</para>
478 <ref type="application">ForkCDR</ref>
479 <ref type="application">NoCDR</ref>
482 <application name="Ringing" language="en_US">
484 Indicate ringing tone.
488 <para>This application will request that the channel indicate a ringing tone to the user.</para>
491 <ref type="application">Busy</ref>
492 <ref type="application">Congestion</ref>
493 <ref type="application">Progress</ref>
494 <ref type="application">Playtones</ref>
497 <application name="SayAlpha" language="en_US">
502 <parameter name="string" required="true" />
505 <para>This application will play the sounds that correspond to the letters of the
506 given <replaceable>string</replaceable>.</para>
509 <ref type="application">SayDigits</ref>
510 <ref type="application">SayNumber</ref>
511 <ref type="application">SayPhonetic</ref>
512 <ref type="function">CHANNEL</ref>
515 <application name="SayDigits" language="en_US">
520 <parameter name="digits" required="true" />
523 <para>This application will play the sounds that correspond to the digits of
524 the given number. This will use the language that is currently set for the channel.</para>
527 <ref type="application">SayAlpha</ref>
528 <ref type="application">SayNumber</ref>
529 <ref type="application">SayPhonetic</ref>
530 <ref type="function">CHANNEL</ref>
533 <application name="SayNumber" language="en_US">
538 <parameter name="digits" required="true" />
539 <parameter name="gender" />
542 <para>This application will play the sounds that correspond to the given <replaceable>digits</replaceable>.
543 Optionally, a <replaceable>gender</replaceable> may be specified. This will use the language that is currently
544 set for the channel. See the LANGUAGE() function for more information on setting the language for the channel.</para>
547 <ref type="application">SayAlpha</ref>
548 <ref type="application">SayDigits</ref>
549 <ref type="application">SayPhonetic</ref>
550 <ref type="function">CHANNEL</ref>
553 <application name="SayPhonetic" language="en_US">
558 <parameter name="string" required="true" />
561 <para>This application will play the sounds from the phonetic alphabet that correspond to the
562 letters in the given <replaceable>string</replaceable>.</para>
565 <ref type="application">SayAlpha</ref>
566 <ref type="application">SayDigits</ref>
567 <ref type="application">SayNumber</ref>
570 <application name="Set" language="en_US">
572 Set channel variable or function value.
575 <parameter name="name" required="true" />
576 <parameter name="value" required="true" />
579 <para>This function can be used to set the value of channel variables or dialplan functions.
580 When setting variables, if the variable name is prefixed with <literal>_</literal>,
581 the variable will be inherited into channels created from the current channel.
582 If the variable name is prefixed with <literal>__</literal>, the variable will be
583 inherited into channels created from the current channel and all children channels.</para>
584 <note><para>If (and only if), in <filename>/etc/asterisk/asterisk.conf</filename>, you have
585 a <literal>[compat]</literal> category, and you have <literal>app_set = 1.6</literal> under that,then
586 the behavior of this app changes, and does not strip surrounding quotes from the right hand side as
587 it did previously in 1.4. The <literal>app_set = 1.6</literal> is only inserted if <literal>make samples</literal>
588 is executed, or if users insert this by hand into the <filename>asterisk.conf</filename> file.
589 The advantages of not stripping out quoting, and not caring about the separator characters (comma and vertical bar)
590 were sufficient to make these changes in 1.6. Confusion about how many backslashes would be needed to properly
591 protect separators and quotes in various database access strings has been greatly
592 reduced by these changes.</para></note>
595 <ref type="application">MSet</ref>
596 <ref type="function">GLOBAL</ref>
597 <ref type="function">SET</ref>
598 <ref type="function">ENV</ref>
601 <application name="MSet" language="en_US">
603 Set channel variable(s) or function value(s).
606 <parameter name="set1" required="true" argsep="=">
607 <argument name="name1" required="true" />
608 <argument name="value1" required="true" />
610 <parameter name="set2" multiple="true" argsep="=">
611 <argument name="name2" required="true" />
612 <argument name="value2" required="true" />
616 <para>This function can be used to set the value of channel variables or dialplan functions.
617 When setting variables, if the variable name is prefixed with <literal>_</literal>,
618 the variable will be inherited into channels created from the current channel
619 If the variable name is prefixed with <literal>__</literal>, the variable will be
620 inherited into channels created from the current channel and all children channels.
621 MSet behaves in a similar fashion to the way Set worked in 1.2/1.4 and is thus
622 prone to doing things that you may not expect. For example, it strips surrounding
623 double-quotes from the right-hand side (value). If you need to put a separator
624 character (comma or vert-bar), you will need to escape them by inserting a backslash
625 before them. Avoid its use if possible.</para>
628 <ref type="application">Set</ref>
631 <application name="SetAMAFlags" language="en_US">
636 <parameter name="flag" />
639 <para>This application will set the channel's AMA Flags for billing purposes.</para>
642 <ref type="function">CDR</ref>
645 <application name="Wait" language="en_US">
650 <parameter name="seconds" required="true">
651 <para>Can be passed with fractions of a second. For example, <literal>1.5</literal> will ask the
652 application to wait for 1.5 seconds.</para>
656 <para>This application waits for a specified number of <replaceable>seconds</replaceable>.</para>
659 <application name="WaitExten" language="en_US">
661 Waits for an extension to be entered.
664 <parameter name="seconds">
665 <para>Can be passed with fractions of a second. For example, <literal>1.5</literal> will ask the
666 application to wait for 1.5 seconds.</para>
668 <parameter name="options">
671 <para>Provide music on hold to the caller while waiting for an extension.</para>
673 <para>Specify the class for music on hold.</para>
680 <para>This application waits for the user to enter a new extension for a specified number
681 of <replaceable>seconds</replaceable>.</para>
682 <xi:include xpointer="xpointer(/docs/application[@name='Macro']/description/warning[2])" />
685 <ref type="application">Background</ref>
686 <ref type="function">TIMEOUT</ref>
689 <function name="EXCEPTION" language="en_US">
691 Retrieve the details of the current dialplan exception.
694 <parameter name="field" required="true">
695 <para>The following fields are available for retrieval:</para>
698 <para>INVALID, ERROR, RESPONSETIMEOUT, ABSOLUTETIMEOUT, or custom
699 value set by the RaiseException() application</para>
701 <enum name="context">
702 <para>The context executing when the exception occurred.</para>
705 <para>The extension executing when the exception occurred.</para>
707 <enum name="priority">
708 <para>The numeric priority executing when the exception occurred.</para>
714 <para>Retrieve the details (specified <replaceable>field</replaceable>) of the current dialplan exception.</para>
717 <ref type="application">RaiseException</ref>
720 <manager name="ShowDialPlan" language="en_US">
725 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
726 <parameter name="Extension">
727 <para>Show a specific extension.</para>
729 <parameter name="Context">
730 <para>Show a specific context.</para>
734 <para>Show dialplan contexts and extensions. Be aware that showing the full dialplan
735 may take a lot of capacity.</para>
741 #define EXT_DATA_SIZE 256
743 #define EXT_DATA_SIZE 8192
746 #define SWITCH_DATA_LENGTH 256
748 #define VAR_BUF_SIZE 4096
751 #define VAR_SOFTTRAN 2
752 #define VAR_HARDTRAN 3
754 #define BACKGROUND_SKIP (1 << 0)
755 #define BACKGROUND_NOANSWER (1 << 1)
756 #define BACKGROUND_MATCHEXTEN (1 << 2)
757 #define BACKGROUND_PLAYBACK (1 << 3)
759 AST_APP_OPTIONS(background_opts, {
760 AST_APP_OPTION('s', BACKGROUND_SKIP),
761 AST_APP_OPTION('n', BACKGROUND_NOANSWER),
762 AST_APP_OPTION('m', BACKGROUND_MATCHEXTEN),
763 AST_APP_OPTION('p', BACKGROUND_PLAYBACK),
766 #define WAITEXTEN_MOH (1 << 0)
767 #define WAITEXTEN_DIALTONE (1 << 1)
769 AST_APP_OPTIONS(waitexten_opts, {
770 AST_APP_OPTION_ARG('m', WAITEXTEN_MOH, 0),
771 AST_APP_OPTION_ARG('d', WAITEXTEN_DIALTONE, 0),
777 static struct ast_taskprocessor *device_state_tps;
779 AST_THREADSTORAGE(switch_data);
780 AST_THREADSTORAGE(extensionstate_buf);
783 \brief ast_exten: An extension
784 The dialplan is saved as a linked list with each context
785 having it's own linked list of extensions - one item per
789 char *exten; /*!< Extension name */
790 int matchcid; /*!< Match caller id ? */
791 const char *cidmatch; /*!< Caller id to match for this extension */
792 int priority; /*!< Priority */
793 const char *label; /*!< Label */
794 struct ast_context *parent; /*!< The context this extension belongs to */
795 const char *app; /*!< Application to execute */
796 struct ast_app *cached_app; /*!< Cached location of application */
797 void *data; /*!< Data to use (arguments) */
798 void (*datad)(void *); /*!< Data destructor */
799 struct ast_exten *peer; /*!< Next higher priority with our extension */
800 struct ast_hashtab *peer_table; /*!< Priorities list in hashtab form -- only on the head of the peer list */
801 struct ast_hashtab *peer_label_table; /*!< labeled priorities in the peers -- only on the head of the peer list */
802 const char *registrar; /*!< Registrar */
803 struct ast_exten *next; /*!< Extension with a greater ID */
807 /*! \brief ast_include: include= support in extensions.conf */
810 const char *rname; /*!< Context to include */
811 const char *registrar; /*!< Registrar */
812 int hastime; /*!< If time construct exists */
813 struct ast_timing timing; /*!< time construct */
814 struct ast_include *next; /*!< Link them together */
818 /*! \brief ast_sw: Switch statement in extensions.conf */
821 const char *registrar; /*!< Registrar */
822 char *data; /*!< Data load */
824 AST_LIST_ENTRY(ast_sw) list;
828 /*! \brief ast_ignorepat: Ignore patterns in dial plan */
829 struct ast_ignorepat {
830 const char *registrar;
831 struct ast_ignorepat *next;
832 const char pattern[0];
835 /*! \brief match_char: forms a syntax tree for quick matching of extension patterns */
838 int is_pattern; /* the pattern started with '_' */
839 int deleted; /* if this is set, then... don't return it */
840 int specificity; /* simply the strlen of x, or 10 for X, 9 for Z, and 8 for N; and '.' and '!' will add 11 ? */
841 struct match_char *alt_char;
842 struct match_char *next_char;
843 struct ast_exten *exten; /* attached to last char of a pattern for exten */
844 char x[1]; /* the pattern itself-- matches a single char */
847 struct scoreboard /* make sure all fields are 0 before calling new_find_extension */
849 int total_specificity;
851 char last_char; /* set to ! or . if they are the end of the pattern */
852 int canmatch; /* if the string to match was just too short */
853 struct match_char *node;
854 struct ast_exten *canmatch_exten;
855 struct ast_exten *exten;
858 /*! \brief ast_context: An extension context */
860 ast_rwlock_t lock; /*!< A lock to prevent multiple threads from clobbering the context */
861 struct ast_exten *root; /*!< The root of the list of extensions */
862 struct ast_hashtab *root_table; /*!< For exact matches on the extensions in the pattern tree, and for traversals of the pattern_tree */
863 struct match_char *pattern_tree; /*!< A tree to speed up extension pattern matching */
864 struct ast_context *next; /*!< Link them together */
865 struct ast_include *includes; /*!< Include other contexts */
866 struct ast_ignorepat *ignorepats; /*!< Patterns for which to continue playing dialtone */
867 char *registrar; /*!< Registrar -- make sure you malloc this, as the registrar may have to survive module unloads */
868 int refcount; /*!< each module that would have created this context should inc/dec this as appropriate */
869 AST_LIST_HEAD_NOLOCK(, ast_sw) alts; /*!< Alternative switches */
870 ast_mutex_t macrolock; /*!< A lock to implement "exclusive" macros - held whilst a call is executing in the macro */
871 char name[0]; /*!< Name of the context */
874 /*! \brief ast_app: A registered application */
876 int (*execute)(struct ast_channel *chan, const char *data);
877 AST_DECLARE_STRING_FIELDS(
878 AST_STRING_FIELD(synopsis); /*!< Synopsis text for 'show applications' */
879 AST_STRING_FIELD(description); /*!< Description (help text) for 'show application <name>' */
880 AST_STRING_FIELD(syntax); /*!< Syntax text for 'core show applications' */
881 AST_STRING_FIELD(arguments); /*!< Arguments description */
882 AST_STRING_FIELD(seealso); /*!< See also */
885 enum ast_doc_src docsrc; /*!< Where the documentation come from. */
887 AST_RWLIST_ENTRY(ast_app) list; /*!< Next app in list */
888 struct ast_module *module; /*!< Module this app belongs to */
889 char name[0]; /*!< Name of the application */
892 /*! \brief ast_state_cb: An extension state notify register item */
893 struct ast_state_cb {
896 ast_state_cb_type callback;
897 AST_LIST_ENTRY(ast_state_cb) entry;
900 /*! \brief Structure for dial plan hints
902 \note Hints are pointers from an extension in the dialplan to one or
903 more devices (tech/name)
904 - See \ref AstExtState
907 struct ast_exten *exten; /*!< Extension */
908 int laststate; /*!< Last known state */
909 AST_LIST_HEAD_NOLOCK(, ast_state_cb) callbacks; /*!< Callback list for this extension */
910 AST_RWLIST_ENTRY(ast_hint) list;/*!< Pointer to next hint in list */
913 static const struct cfextension_states {
915 const char * const text;
916 } extension_states[] = {
917 { AST_EXTENSION_NOT_INUSE, "Idle" },
918 { AST_EXTENSION_INUSE, "InUse" },
919 { AST_EXTENSION_BUSY, "Busy" },
920 { AST_EXTENSION_UNAVAILABLE, "Unavailable" },
921 { AST_EXTENSION_RINGING, "Ringing" },
922 { AST_EXTENSION_INUSE | AST_EXTENSION_RINGING, "InUse&Ringing" },
923 { AST_EXTENSION_ONHOLD, "Hold" },
924 { AST_EXTENSION_INUSE | AST_EXTENSION_ONHOLD, "InUse&Hold" }
928 AST_LIST_ENTRY(statechange) entry;
932 struct pbx_exception {
933 AST_DECLARE_STRING_FIELDS(
934 AST_STRING_FIELD(context); /*!< Context associated with this exception */
935 AST_STRING_FIELD(exten); /*!< Exten associated with this exception */
936 AST_STRING_FIELD(reason); /*!< The exception reason */
939 int priority; /*!< Priority associated with this exception */
942 static int pbx_builtin_answer(struct ast_channel *, const char *);
943 static int pbx_builtin_goto(struct ast_channel *, const char *);
944 static int pbx_builtin_hangup(struct ast_channel *, const char *);
945 static int pbx_builtin_background(struct ast_channel *, const char *);
946 static int pbx_builtin_wait(struct ast_channel *, const char *);
947 static int pbx_builtin_waitexten(struct ast_channel *, const char *);
948 static int pbx_builtin_incomplete(struct ast_channel *, const char *);
949 static int pbx_builtin_resetcdr(struct ast_channel *, const char *);
950 static int pbx_builtin_setamaflags(struct ast_channel *, const char *);
951 static int pbx_builtin_ringing(struct ast_channel *, const char *);
952 static int pbx_builtin_proceeding(struct ast_channel *, const char *);
953 static int pbx_builtin_progress(struct ast_channel *, const char *);
954 static int pbx_builtin_congestion(struct ast_channel *, const char *);
955 static int pbx_builtin_busy(struct ast_channel *, const char *);
956 static int pbx_builtin_noop(struct ast_channel *, const char *);
957 static int pbx_builtin_gotoif(struct ast_channel *, const char *);
958 static int pbx_builtin_gotoiftime(struct ast_channel *, const char *);
959 static int pbx_builtin_execiftime(struct ast_channel *, const char *);
960 static int pbx_builtin_saynumber(struct ast_channel *, const char *);
961 static int pbx_builtin_saydigits(struct ast_channel *, const char *);
962 static int pbx_builtin_saycharacters(struct ast_channel *, const char *);
963 static int pbx_builtin_sayphonetic(struct ast_channel *, const char *);
964 static int matchcid(const char *cidpattern, const char *callerid);
966 static void log_match_char_tree(struct match_char *node, char *prefix); /* for use anywhere */
968 static int pbx_builtin_importvar(struct ast_channel *, const char *);
969 static void set_ext_pri(struct ast_channel *c, const char *exten, int pri);
970 static void new_find_extension(const char *str, struct scoreboard *score,
971 struct match_char *tree, int length, int spec, const char *callerid,
972 const char *label, enum ext_match_t action);
973 static struct match_char *already_in_tree(struct match_char *current, char *pat, int is_pattern);
974 static struct match_char *add_exten_to_pattern_tree(struct ast_context *con,
975 struct ast_exten *e1, int findonly);
976 static struct match_char *add_pattern_node(struct ast_context *con,
977 struct match_char *current, char *pattern, int is_pattern,
978 int already, int specificity, struct match_char **parent);
979 static void create_match_char_tree(struct ast_context *con);
980 static struct ast_exten *get_canmatch_exten(struct match_char *node);
981 static void destroy_pattern_tree(struct match_char *pattern_tree);
982 static int hashtab_compare_extens(const void *ha_a, const void *ah_b);
983 static int hashtab_compare_exten_numbers(const void *ah_a, const void *ah_b);
984 static int hashtab_compare_exten_labels(const void *ah_a, const void *ah_b);
985 static unsigned int hashtab_hash_extens(const void *obj);
986 static unsigned int hashtab_hash_priority(const void *obj);
987 static unsigned int hashtab_hash_labels(const void *obj);
988 static void __ast_internal_context_destroy( struct ast_context *con);
989 static int ast_add_extension_nolock(const char *context, int replace, const char *extension,
990 int priority, const char *label, const char *callerid,
991 const char *application, void *data, void (*datad)(void *), const char *registrar);
992 static int add_pri_lockopt(struct ast_context *con, struct ast_exten *tmp,
993 struct ast_exten *el, struct ast_exten *e, int replace, int lockhints);
994 static int ast_add_extension2_lockopt(struct ast_context *con,
995 int replace, const char *extension, int priority, const char *label, const char *callerid,
996 const char *application, void *data, void (*datad)(void *),
997 const char *registrar, int lockconts, int lockhints);
999 /* a func for qsort to use to sort a char array */
1000 static int compare_char(const void *a, const void *b)
1006 else if ((*ac) == (*bc))
1012 /* labels, contexts are case sensitive priority numbers are ints */
1013 int ast_hashtab_compare_contexts(const void *ah_a, const void *ah_b)
1015 const struct ast_context *ac = ah_a;
1016 const struct ast_context *bc = ah_b;
1017 if (!ac || !bc) /* safety valve, but it might prevent a crash you'd rather have happen */
1019 /* assume context names are registered in a string table! */
1020 return strcmp(ac->name, bc->name);
1023 static int hashtab_compare_extens(const void *ah_a, const void *ah_b)
1025 const struct ast_exten *ac = ah_a;
1026 const struct ast_exten *bc = ah_b;
1027 int x = strcmp(ac->exten, bc->exten);
1028 if (x) { /* if exten names are diff, then return */
1032 /* but if they are the same, do the cidmatch values match? */
1033 if (ac->matchcid && bc->matchcid) {
1034 return strcmp(ac->cidmatch,bc->cidmatch);
1035 } else if (!ac->matchcid && !bc->matchcid) {
1036 return 0; /* if there's no matchcid on either side, then this is a match */
1038 return 1; /* if there's matchcid on one but not the other, they are different */
1042 static int hashtab_compare_exten_numbers(const void *ah_a, const void *ah_b)
1044 const struct ast_exten *ac = ah_a;
1045 const struct ast_exten *bc = ah_b;
1046 return ac->priority != bc->priority;
1049 static int hashtab_compare_exten_labels(const void *ah_a, const void *ah_b)
1051 const struct ast_exten *ac = ah_a;
1052 const struct ast_exten *bc = ah_b;
1053 return strcmp(S_OR(ac->label, ""), S_OR(bc->label, ""));
1056 unsigned int ast_hashtab_hash_contexts(const void *obj)
1058 const struct ast_context *ac = obj;
1059 return ast_hashtab_hash_string(ac->name);
1062 static unsigned int hashtab_hash_extens(const void *obj)
1064 const struct ast_exten *ac = obj;
1065 unsigned int x = ast_hashtab_hash_string(ac->exten);
1068 y = ast_hashtab_hash_string(ac->cidmatch);
1072 static unsigned int hashtab_hash_priority(const void *obj)
1074 const struct ast_exten *ac = obj;
1075 return ast_hashtab_hash_int(ac->priority);
1078 static unsigned int hashtab_hash_labels(const void *obj)
1080 const struct ast_exten *ac = obj;
1081 return ast_hashtab_hash_string(S_OR(ac->label, ""));
1085 AST_RWLOCK_DEFINE_STATIC(globalslock);
1086 static struct varshead globals = AST_LIST_HEAD_NOLOCK_INIT_VALUE;
1088 static int autofallthrough = 1;
1089 static int extenpatternmatchnew = 0;
1090 static char *overrideswitch = NULL;
1092 /*! \brief Subscription for device state change events */
1093 static struct ast_event_sub *device_state_sub;
1095 AST_MUTEX_DEFINE_STATIC(maxcalllock);
1096 static int countcalls;
1097 static int totalcalls;
1099 static AST_RWLIST_HEAD_STATIC(acf_root, ast_custom_function);
1101 /*! \brief Declaration of builtin applications */
1102 static struct pbx_builtin {
1103 char name[AST_MAX_APP];
1104 int (*execute)(struct ast_channel *chan, const char *data);
1107 /* These applications are built into the PBX core and do not
1108 need separate modules */
1110 { "Answer", pbx_builtin_answer },
1111 { "BackGround", pbx_builtin_background },
1112 { "Busy", pbx_builtin_busy },
1113 { "Congestion", pbx_builtin_congestion },
1114 { "ExecIfTime", pbx_builtin_execiftime },
1115 { "Goto", pbx_builtin_goto },
1116 { "GotoIf", pbx_builtin_gotoif },
1117 { "GotoIfTime", pbx_builtin_gotoiftime },
1118 { "ImportVar", pbx_builtin_importvar },
1119 { "Hangup", pbx_builtin_hangup },
1120 { "Incomplete", pbx_builtin_incomplete },
1121 { "NoOp", pbx_builtin_noop },
1122 { "Proceeding", pbx_builtin_proceeding },
1123 { "Progress", pbx_builtin_progress },
1124 { "RaiseException", pbx_builtin_raise_exception },
1125 { "ResetCDR", pbx_builtin_resetcdr },
1126 { "Ringing", pbx_builtin_ringing },
1127 { "SayAlpha", pbx_builtin_saycharacters },
1128 { "SayDigits", pbx_builtin_saydigits },
1129 { "SayNumber", pbx_builtin_saynumber },
1130 { "SayPhonetic", pbx_builtin_sayphonetic },
1131 { "Set", pbx_builtin_setvar },
1132 { "MSet", pbx_builtin_setvar_multiple },
1133 { "SetAMAFlags", pbx_builtin_setamaflags },
1134 { "Wait", pbx_builtin_wait },
1135 { "WaitExten", pbx_builtin_waitexten }
1138 static struct ast_context *contexts;
1139 static struct ast_hashtab *contexts_table = NULL;
1141 AST_RWLOCK_DEFINE_STATIC(conlock); /*!< Lock for the ast_context list */
1143 static AST_RWLIST_HEAD_STATIC(apps, ast_app);
1145 static AST_RWLIST_HEAD_STATIC(switches, ast_switch);
1147 static int stateid = 1;
1149 When holding this list's lock, do _not_ do anything that will cause conlock
1150 to be taken, unless you _already_ hold it. The ast_merge_contexts_and_delete
1151 function will take the locks in conlock/hints order, so any other
1152 paths that require both locks must also take them in that order.
1154 static AST_RWLIST_HEAD_STATIC(hints, ast_hint);
1156 static AST_LIST_HEAD_NOLOCK_STATIC(statecbs, ast_state_cb);
1158 #ifdef CONTEXT_DEBUG
1160 /* these routines are provided for doing run-time checks
1161 on the extension structures, in case you are having
1162 problems, this routine might help you localize where
1163 the problem is occurring. It's kinda like a debug memory
1164 allocator's arena checker... It'll eat up your cpu cycles!
1165 but you'll see, if you call it in the right places,
1166 right where your problems began...
1169 /* you can break on the check_contexts_trouble()
1170 routine in your debugger to stop at the moment
1171 there's a problem */
1172 void check_contexts_trouble(void);
1174 void check_contexts_trouble(void)
1180 static struct ast_context *find_context_locked(const char *context);
1181 static struct ast_context *find_context(const char *context);
1182 int check_contexts(char *, int);
1184 int check_contexts(char *file, int line )
1186 struct ast_hashtab_iter *t1;
1187 struct ast_context *c1, *c2;
1189 struct ast_exten *e1, *e2, *e3;
1190 struct ast_exten ex;
1192 /* try to find inconsistencies */
1193 /* is every context in the context table in the context list and vice-versa ? */
1195 if (!contexts_table) {
1196 ast_log(LOG_NOTICE,"Called from: %s:%d: No contexts_table!\n", file, line);
1200 t1 = ast_hashtab_start_traversal(contexts_table);
1201 while( (c1 = ast_hashtab_next(t1))) {
1202 for(c2=contexts;c2;c2=c2->next) {
1203 if (!strcmp(c1->name, c2->name)) {
1209 ast_log(LOG_NOTICE,"Called from: %s:%d: Could not find the %s context in the linked list\n", file, line, c1->name);
1210 check_contexts_trouble();
1213 ast_hashtab_end_traversal(t1);
1214 for(c2=contexts;c2;c2=c2->next) {
1215 c1 = find_context_locked(c2->name);
1217 ast_log(LOG_NOTICE,"Called from: %s:%d: Could not find the %s context in the hashtab\n", file, line, c2->name);
1218 check_contexts_trouble();
1220 ast_unlock_contexts();
1223 /* loop thru all contexts, and verify the exten structure compares to the
1224 hashtab structure */
1225 for(c2=contexts;c2;c2=c2->next) {
1226 c1 = find_context_locked(c2->name);
1230 ast_unlock_contexts();
1232 /* is every entry in the root list also in the root_table? */
1233 for(e1 = c1->root; e1; e1=e1->next)
1235 char dummy_name[1024];
1236 ex.exten = dummy_name;
1237 ex.matchcid = e1->matchcid;
1238 ex.cidmatch = e1->cidmatch;
1239 ast_copy_string(dummy_name, e1->exten, sizeof(dummy_name));
1240 e2 = ast_hashtab_lookup(c1->root_table, &ex);
1243 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 );
1245 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 );
1247 check_contexts_trouble();
1251 /* is every entry in the root_table also in the root list? */
1252 if (!c2->root_table) {
1254 ast_log(LOG_NOTICE,"Called from: %s:%d: No c2->root_table for context %s!\n", file, line, c2->name);
1258 t1 = ast_hashtab_start_traversal(c2->root_table);
1259 while( (e2 = ast_hashtab_next(t1)) ) {
1260 for(e1=c2->root;e1;e1=e1->next) {
1261 if (!strcmp(e1->exten, e2->exten)) {
1267 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);
1268 check_contexts_trouble();
1272 ast_hashtab_end_traversal(t1);
1275 /* is every priority reflected in the peer_table at the head of the list? */
1277 /* is every entry in the root list also in the root_table? */
1278 /* are the per-extension peer_tables in the right place? */
1280 for(e1 = c2->root; e1; e1 = e1->next) {
1282 for(e2=e1;e2;e2=e2->peer) {
1283 ex.priority = e2->priority;
1284 if (e2 != e1 && e2->peer_table) {
1285 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 );
1286 check_contexts_trouble();
1289 if (e2 != e1 && e2->peer_label_table) {
1290 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 );
1291 check_contexts_trouble();
1294 if (e2 == e1 && !e2->peer_table){
1295 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 );
1296 check_contexts_trouble();
1299 if (e2 == e1 && !e2->peer_label_table) {
1300 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 );
1301 check_contexts_trouble();
1305 e3 = ast_hashtab_lookup(e1->peer_table, &ex);
1307 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 );
1308 check_contexts_trouble();
1312 if (!e1->peer_table){
1313 ast_log(LOG_NOTICE,"Called from: %s:%d: No e1->peer_table!\n", file, line);
1317 /* is every entry in the peer_table also in the peer list? */
1318 t1 = ast_hashtab_start_traversal(e1->peer_table);
1319 while( (e2 = ast_hashtab_next(t1)) ) {
1320 for(e3=e1;e3;e3=e3->peer) {
1321 if (e3->priority == e2->priority) {
1327 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 );
1328 check_contexts_trouble();
1331 ast_hashtab_end_traversal(t1);
1339 \note This function is special. It saves the stack so that no matter
1340 how many times it is called, it returns to the same place */
1341 int pbx_exec(struct ast_channel *c, /*!< Channel */
1342 struct ast_app *app, /*!< Application */
1343 const char *data) /*!< Data for execution */
1346 struct ast_module_user *u = NULL;
1347 const char *saved_c_appl;
1348 const char *saved_c_data;
1350 if (c->cdr && !ast_check_hangup(c))
1351 ast_cdr_setapp(c->cdr, app->name, data);
1353 /* save channel values */
1354 saved_c_appl= c->appl;
1355 saved_c_data= c->data;
1357 c->appl = app->name;
1359 ast_cel_report_event(c, AST_CEL_APP_START, NULL, NULL, NULL);
1362 u = __ast_module_user_add(app->module, c);
1363 if (strcasecmp(app->name, "system") && !ast_strlen_zero(data) &&
1364 strchr(data, '|') && !strchr(data, ',') && !ast_opt_dont_warn) {
1365 ast_log(LOG_WARNING, "The application delimiter is now the comma, not "
1366 "the pipe. Did you forget to convert your dialplan? (%s(%s))\n",
1367 app->name, (char *) data);
1369 res = app->execute(c, S_OR(data, ""));
1370 if (app->module && u)
1371 __ast_module_user_remove(app->module, u);
1372 ast_cel_report_event(c, AST_CEL_APP_END, NULL, NULL, NULL);
1373 /* restore channel values */
1374 c->appl = saved_c_appl;
1375 c->data = saved_c_data;
1380 /*! Go no deeper than this through includes (not counting loops) */
1381 #define AST_PBX_MAX_STACK 128
1383 /*! \brief Find application handle in linked list
1385 struct ast_app *pbx_findapp(const char *app)
1387 struct ast_app *tmp;
1389 AST_RWLIST_RDLOCK(&apps);
1390 AST_RWLIST_TRAVERSE(&apps, tmp, list) {
1391 if (!strcasecmp(tmp->name, app))
1394 AST_RWLIST_UNLOCK(&apps);
1399 static struct ast_switch *pbx_findswitch(const char *sw)
1401 struct ast_switch *asw;
1403 AST_RWLIST_RDLOCK(&switches);
1404 AST_RWLIST_TRAVERSE(&switches, asw, list) {
1405 if (!strcasecmp(asw->name, sw))
1408 AST_RWLIST_UNLOCK(&switches);
1413 static inline int include_valid(struct ast_include *i)
1418 return ast_check_timing(&(i->timing));
1421 static void pbx_destroy(struct ast_pbx *p)
1426 /* form a tree that fully describes all the patterns in a context's extensions
1427 * in this tree, a "node" represents an individual character or character set
1428 * meant to match the corresponding character in a dial string. The tree
1429 * consists of a series of match_char structs linked in a chain
1430 * via the alt_char pointers. More than one pattern can share the same parts of the
1431 * tree as other extensions with the same pattern to that point.
1432 * My first attempt to duplicate the finding of the 'best' pattern was flawed in that
1433 * I misunderstood the general algorithm. I thought that the 'best' pattern
1434 * was the one with lowest total score. This was not true. Thus, if you have
1435 * patterns "1XXXXX" and "X11111", you would be tempted to say that "X11111" is
1436 * the "best" match because it has fewer X's, and is therefore more specific,
1437 * but this is not how the old algorithm works. It sorts matching patterns
1438 * in a similar collating sequence as sorting alphabetic strings, from left to
1439 * right. Thus, "1XXXXX" comes before "X11111", and would be the "better" match,
1440 * because "1" is more specific than "X".
1441 * So, to accomodate this philosophy, I sort the tree branches along the alt_char
1442 * line so they are lowest to highest in specificity numbers. This way, as soon
1443 * as we encounter our first complete match, we automatically have the "best"
1444 * match and can stop the traversal immediately. Same for CANMATCH/MATCHMORE.
1445 * If anyone would like to resurrect the "wrong" pattern trie searching algorithm,
1446 * they are welcome to revert pbx to before 1 Apr 2008.
1447 * As an example, consider these 4 extensions:
1453 * In the above, between (a) and (d), (a) is a more specific pattern than (d), and would win over
1454 * most numbers. For all numbers beginning with 307754, (b) should always win.
1456 * These pattern should form a (sorted) tree that looks like this:
1457 * { "3" } --next--> { "0" } --next--> { "7" } --next--> { "7" } --next--> { "5" } ... blah ... --> { "X" exten_match: (b) }
1461 * { "f" } --next--> { "a" } --next--> { "x" exten_match: (c) }
1462 * { "N" } --next--> { "X" } --next--> { "X" } --next--> { "N" } --next--> { "X" } ... blah ... --> { "X" exten_match: (a) }
1466 * | { "X" } --next--> { "X" } ... blah ... --> { "X" exten_match: (d) }
1470 * In the above, I could easily turn "N" into "23456789", but I think that a quick "if( *z >= '2' && *z <= '9' )" might take
1471 * fewer CPU cycles than a call to strchr("23456789",*z), where *z is the char to match...
1473 * traversal is pretty simple: one routine merely traverses the alt list, and for each matching char in the pattern, it calls itself
1474 * on the corresponding next pointer, incrementing also the pointer of the string to be matched, and passing the total specificity and length.
1475 * We pass a pointer to a scoreboard down through, also.
1476 * The scoreboard isn't as necessary to the revised algorithm, but I kept it as a handy way to return the matched extension.
1477 * The first complete match ends the traversal, which should make this version of the pattern matcher faster
1478 * the previous. The same goes for "CANMATCH" or "MATCHMORE"; the first such match ends the traversal. In both
1479 * these cases, the reason we can stop immediately, is because the first pattern match found will be the "best"
1480 * according to the sort criteria.
1481 * Hope the limit on stack depth won't be a problem... this routine should
1482 * be pretty lean as far a stack usage goes. Any non-match terminates the recursion down a branch.
1484 * In the above example, with the number "3077549999" as the pattern, the traversor could match extensions a, b and d. All are
1485 * of length 10; they have total specificities of 24580, 10246, and 25090, respectively, not that this matters
1486 * at all. (b) wins purely because the first character "3" is much more specific (lower specificity) than "N". I have
1487 * left the specificity totals in the code as an artifact; at some point, I will strip it out.
1489 * Just how much time this algorithm might save over a plain linear traversal over all possible patterns is unknown,
1490 * because it's a function of how many extensions are stored in a context. With thousands of extensions, the speedup
1491 * can be very noticeable. The new matching algorithm can run several hundreds of times faster, if not a thousand or
1492 * more times faster in extreme cases.
1494 * MatchCID patterns are also supported, and stored in the tree just as the extension pattern is. Thus, you
1495 * can have patterns in your CID field as well.
1500 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)
1502 /* if this extension is marked as deleted, then skip this -- if it never shows
1503 on the scoreboard, it will never be found, nor will halt the traversal. */
1506 board->total_specificity = spec;
1507 board->total_length = length;
1508 board->exten = exten;
1509 board->last_char = last;
1511 #ifdef NEED_DEBUG_HERE
1512 ast_log(LOG_NOTICE,"Scoreboarding (LONGER) %s, len=%d, score=%d\n", exten->exten, length, spec);
1517 static void log_match_char_tree(struct match_char *node, char *prefix)
1520 struct ast_str *my_prefix = ast_str_alloca(1024);
1524 if (node && node->exten)
1525 snprintf(extenstr, sizeof(extenstr), "(%p)", node->exten);
1527 if (strlen(node->x) > 1) {
1528 ast_debug(1, "%s[%s]:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N',
1529 node->deleted? 'D':'-', node->specificity, node->exten? "EXTEN:":"",
1530 node->exten ? node->exten->exten : "", extenstr);
1532 ast_debug(1, "%s%s:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y':'N',
1533 node->deleted? 'D':'-', node->specificity, node->exten? "EXTEN:":"",
1534 node->exten ? node->exten->exten : "", extenstr);
1537 ast_str_set(&my_prefix, 0, "%s+ ", prefix);
1539 if (node->next_char)
1540 log_match_char_tree(node->next_char, ast_str_buffer(my_prefix));
1543 log_match_char_tree(node->alt_char, prefix);
1547 static void cli_match_char_tree(struct match_char *node, char *prefix, int fd)
1550 struct ast_str *my_prefix = ast_str_alloca(1024);
1554 if (node && node->exten)
1555 snprintf(extenstr, sizeof(extenstr), "(%p)", node->exten);
1557 if (strlen(node->x) > 1) {
1558 ast_cli(fd, "%s[%s]:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y' : 'N',
1559 node->deleted ? 'D' : '-', node->specificity, node->exten? "EXTEN:" : "",
1560 node->exten ? node->exten->exten : "", extenstr);
1562 ast_cli(fd, "%s%s:%c:%c:%d:%s%s%s\n", prefix, node->x, node->is_pattern ? 'Y' : 'N',
1563 node->deleted ? 'D' : '-', node->specificity, node->exten? "EXTEN:" : "",
1564 node->exten ? node->exten->exten : "", extenstr);
1567 ast_str_set(&my_prefix, 0, "%s+ ", prefix);
1569 if (node->next_char)
1570 cli_match_char_tree(node->next_char, ast_str_buffer(my_prefix), fd);
1573 cli_match_char_tree(node->alt_char, prefix, fd);
1576 static struct ast_exten *get_canmatch_exten(struct match_char *node)
1578 /* find the exten at the end of the rope */
1579 struct match_char *node2 = node;
1581 for (node2 = node; node2; node2 = node2->next_char) {
1583 #ifdef NEED_DEBUG_HERE
1584 ast_log(LOG_NOTICE,"CanMatch_exten returns exten %s(%p)\n", node2->exten->exten, node2->exten);
1586 return node2->exten;
1589 #ifdef NEED_DEBUG_HERE
1590 ast_log(LOG_NOTICE,"CanMatch_exten returns NULL, match_char=%s\n", node->x);
1595 static struct ast_exten *trie_find_next_match(struct match_char *node)
1597 struct match_char *m3;
1598 struct match_char *m4;
1599 struct ast_exten *e3;
1601 if (node && node->x[0] == '.' && !node->x[1]) { /* dot and ! will ALWAYS be next match in a matchmore */
1605 if (node && node->x[0] == '!' && !node->x[1]) {
1609 if (!node || !node->next_char) {
1613 m3 = node->next_char;
1618 for (m4 = m3->alt_char; m4; m4 = m4->alt_char) {
1623 for (m4 = m3; m4; m4 = m4->alt_char) {
1624 e3 = trie_find_next_match(m3);
1634 static char *action2str(enum ext_match_t action)
1654 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)
1656 struct match_char *p; /* note minimal stack storage requirements */
1657 struct ast_exten pattern = { .label = label };
1660 ast_log(LOG_NOTICE,"new_find_extension called with %s on (sub)tree %s action=%s\n", str, tree->x, action2str(action));
1662 ast_log(LOG_NOTICE,"new_find_extension called with %s on (sub)tree NULL action=%s\n", str, action2str(action));
1664 for (p = tree; p; p = p->alt_char) {
1665 if (p->is_pattern) {
1666 if (p->x[0] == 'N') {
1667 if (p->x[1] == 0 && *str >= '2' && *str <= '9' ) {
1668 #define NEW_MATCHER_CHK_MATCH \
1669 if (p->exten && !(*(str + 1))) { /* if a shorter pattern matches along the way, might as well report it */ \
1670 if (action == E_MATCH || action == E_SPAWN || action == E_FINDLABEL) { /* if in CANMATCH/MATCHMORE, don't let matches get in the way */ \
1671 update_scoreboard(score, length + 1, spec + p->specificity, p->exten, 0, callerid, p->deleted, p); \
1672 if (!p->deleted) { \
1673 if (action == E_FINDLABEL) { \
1674 if (ast_hashtab_lookup(score->exten->peer_label_table, &pattern)) { \
1675 ast_debug(4, "Found label in preferred extension\n"); \
1679 ast_debug(4, "returning an exact match-- first found-- %s\n", p->exten->exten); \
1680 return; /* the first match, by definition, will be the best, because of the sorted tree */ \
1686 #define NEW_MATCHER_RECURSE \
1687 if (p->next_char && (*(str + 1) || (p->next_char->x[0] == '/' && p->next_char->x[1] == 0) \
1688 || p->next_char->x[0] == '!')) { \
1689 if (*(str + 1) || p->next_char->x[0] == '!') { \
1690 new_find_extension(str + 1, score, p->next_char, length + 1, spec + p->specificity, callerid, label, action); \
1691 if (score->exten) { \
1692 ast_debug(4 ,"returning an exact match-- %s\n", score->exten->exten); \
1693 return; /* the first match is all we need */ \
1696 new_find_extension("/", score, p->next_char, length + 1, spec + p->specificity, callerid, label, action); \
1697 if (score->exten || ((action == E_CANMATCH || action == E_MATCHMORE) && score->canmatch)) { \
1698 ast_debug(4,"returning a (can/more) match--- %s\n", score->exten ? score->exten->exten : \
1700 return; /* the first match is all we need */ \
1703 } else if (p->next_char && !*(str + 1)) { \
1704 score->canmatch = 1; \
1705 score->canmatch_exten = get_canmatch_exten(p); \
1706 if (action == E_CANMATCH || action == E_MATCHMORE) { \
1707 ast_debug(4, "returning a canmatch/matchmore--- str=%s\n", str); \
1712 NEW_MATCHER_CHK_MATCH;
1713 NEW_MATCHER_RECURSE;
1715 } else if (p->x[0] == 'Z') {
1716 if (p->x[1] == 0 && *str >= '1' && *str <= '9' ) {
1717 NEW_MATCHER_CHK_MATCH;
1718 NEW_MATCHER_RECURSE;
1720 } else if (p->x[0] == 'X') {
1721 if (p->x[1] == 0 && *str >= '0' && *str <= '9' ) {
1722 NEW_MATCHER_CHK_MATCH;
1723 NEW_MATCHER_RECURSE;
1725 } else if (p->x[0] == '.' && p->x[1] == 0) {
1726 /* how many chars will the . match against? */
1728 const char *str2 = str;
1729 while (*str2 && *str2 != '/') {
1733 if (p->exten && *str2 != '/') {
1734 update_scoreboard(score, length + i, spec + (i * p->specificity), p->exten, '.', callerid, p->deleted, p);
1736 ast_debug(4,"return because scoreboard has a match with '/'--- %s\n", score->exten->exten);
1737 return; /* the first match is all we need */
1740 if (p->next_char && p->next_char->x[0] == '/' && p->next_char->x[1] == 0) {
1741 new_find_extension("/", score, p->next_char, length + i, spec+(p->specificity*i), callerid, label, action);
1742 if (score->exten || ((action == E_CANMATCH || action == E_MATCHMORE) && score->canmatch)) {
1743 ast_debug(4, "return because scoreboard has exact match OR CANMATCH/MATCHMORE & canmatch set--- %s\n", score->exten ? score->exten->exten : "NULL");
1744 return; /* the first match is all we need */
1747 } else if (p->x[0] == '!' && p->x[1] == 0) {
1748 /* how many chars will the . match against? */
1750 const char *str2 = str;
1751 while (*str2 && *str2 != '/') {
1755 if (p->exten && *str2 != '/') {
1756 update_scoreboard(score, length + 1, spec + (p->specificity * i), p->exten, '!', callerid, p->deleted, p);
1758 ast_debug(4, "return because scoreboard has a '!' match--- %s\n", score->exten->exten);
1759 return; /* the first match is all we need */
1762 if (p->next_char && p->next_char->x[0] == '/' && p->next_char->x[1] == 0) {
1763 new_find_extension("/", score, p->next_char, length + i, spec + (p->specificity * i), callerid, label, action);
1764 if (score->exten || ((action == E_CANMATCH || action == E_MATCHMORE) && score->canmatch)) {
1765 ast_debug(4, "return because scoreboard has exact match OR CANMATCH/MATCHMORE & canmatch set with '/' and '!'--- %s\n", score->exten ? score->exten->exten : "NULL");
1766 return; /* the first match is all we need */
1769 } else if (p->x[0] == '/' && p->x[1] == 0) {
1770 /* the pattern in the tree includes the cid match! */
1771 if (p->next_char && callerid && *callerid) {
1772 new_find_extension(callerid, score, p->next_char, length + 1, spec, callerid, label, action);
1773 if (score->exten || ((action == E_CANMATCH || action == E_MATCHMORE) && score->canmatch)) {
1774 ast_debug(4, "return because scoreboard has exact match OR CANMATCH/MATCHMORE & canmatch set with '/'--- %s\n", score->exten ? score->exten->exten : "NULL");
1775 return; /* the first match is all we need */
1778 } else if (strchr(p->x, *str)) {
1779 ast_debug(4, "Nothing strange about this match\n");
1780 NEW_MATCHER_CHK_MATCH;
1781 NEW_MATCHER_RECURSE;
1783 } else if (strchr(p->x, *str)) {
1784 ast_debug(4, "Nothing strange about this match\n");
1785 NEW_MATCHER_CHK_MATCH;
1786 NEW_MATCHER_RECURSE;
1789 ast_debug(4, "return at end of func\n");
1792 /* the algorithm for forming the extension pattern tree is also a bit simple; you
1793 * traverse all the extensions in a context, and for each char of the extension,
1794 * you see if it exists in the tree; if it doesn't, you add it at the appropriate
1795 * spot. What more can I say? At the end of each exten, you cap it off by adding the
1796 * address of the extension involved. Duplicate patterns will be complained about.
1798 * Ideally, this would be done for each context after it is created and fully
1799 * filled. It could be done as a finishing step after extensions.conf or .ael is
1800 * loaded, or it could be done when the first search is encountered. It should only
1801 * have to be done once, until the next unload or reload.
1803 * I guess forming this pattern tree would be analogous to compiling a regex. Except
1804 * that a regex only handles 1 pattern, really. This trie holds any number
1805 * of patterns. Well, really, it **could** be considered a single pattern,
1806 * where the "|" (or) operator is allowed, I guess, in a way, sort of...
1809 static struct match_char *already_in_tree(struct match_char *current, char *pat, int is_pattern)
1811 struct match_char *t;
1817 for (t = current; t; t = t->alt_char) {
1818 if (is_pattern == t->is_pattern && !strcmp(pat, t->x)) {/* uh, we may want to sort exploded [] contents to make matching easy */
1826 /* The first arg is the location of the tree ptr, or the
1827 address of the next_char ptr in the node, so we can mess
1828 with it, if we need to insert at the beginning of the list */
1830 static void insert_in_next_chars_alt_char_list(struct match_char **parent_ptr, struct match_char *node)
1832 struct match_char *curr, *lcurr;
1834 /* insert node into the tree at "current", so the alt_char list from current is
1835 sorted in increasing value as you go to the leaves */
1836 if (!(*parent_ptr)) {
1841 if ((*parent_ptr)->specificity > node->specificity) {
1842 /* insert at head */
1843 node->alt_char = (*parent_ptr);
1848 lcurr = *parent_ptr;
1849 for (curr = (*parent_ptr)->alt_char; curr; curr = curr->alt_char) {
1850 if (curr->specificity > node->specificity) {
1851 node->alt_char = curr;
1852 lcurr->alt_char = node;
1859 lcurr->alt_char = node;
1864 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)
1866 struct match_char *m;
1868 if (!(m = ast_calloc(1, sizeof(*m) + strlen(pattern)))) {
1872 /* strcpy is safe here since we know its size and have allocated
1873 * just enough space for when we allocated m
1875 strcpy(m->x, pattern);
1877 /* the specificity scores are the same as used in the old
1879 m->is_pattern = is_pattern;
1880 if (specificity == 1 && is_pattern && pattern[0] == 'N')
1881 m->specificity = 0x0802;
1882 else if (specificity == 1 && is_pattern && pattern[0] == 'Z')
1883 m->specificity = 0x0901;
1884 else if (specificity == 1 && is_pattern && pattern[0] == 'X')
1885 m->specificity = 0x0a00;
1886 else if (specificity == 1 && is_pattern && pattern[0] == '.')
1887 m->specificity = 0x10000;
1888 else if (specificity == 1 && is_pattern && pattern[0] == '!')
1889 m->specificity = 0x20000;
1891 m->specificity = specificity;
1893 if (!con->pattern_tree) {
1894 insert_in_next_chars_alt_char_list(&con->pattern_tree, m);
1896 if (already) { /* switch to the new regime (traversing vs appending)*/
1897 insert_in_next_chars_alt_char_list(nextcharptr, m);
1899 insert_in_next_chars_alt_char_list(¤t->next_char, m);
1906 static struct match_char *add_exten_to_pattern_tree(struct ast_context *con, struct ast_exten *e1, int findonly)
1908 struct match_char *m1 = NULL, *m2 = NULL, **m0;
1914 char *s1 = extenbuf;
1915 int l1 = strlen(e1->exten) + strlen(e1->cidmatch) + 2;
1918 ast_copy_string(extenbuf, e1->exten, sizeof(extenbuf));
1920 if (e1->matchcid && l1 <= sizeof(extenbuf)) {
1921 strcat(extenbuf, "/");
1922 strcat(extenbuf, e1->cidmatch);
1923 } else if (l1 > sizeof(extenbuf)) {
1924 ast_log(LOG_ERROR, "The pattern %s/%s is too big to deal with: it will be ignored! Disaster!\n", e1->exten, e1->cidmatch);
1928 ast_log(LOG_DEBUG, "Adding exten %s%c%s to tree\n", s1, e1->matchcid ? '/' : ' ', e1->matchcid ? e1->cidmatch : "");
1930 m1 = con->pattern_tree; /* each pattern starts over at the root of the pattern tree */
1931 m0 = &con->pattern_tree;
1939 if (pattern && *s1 == '[' && *(s1 - 1) != '\\') {
1942 s1++; /* get past the '[' */
1943 while (*s1 != ']' && *(s1 - 1) != '\\') {
1945 if (*(s1 + 1) == ']') {
1948 } else if (*(s1 + 1) == '\\') {
1951 } else if (*(s1 + 1) == '-') {
1954 } else if (*(s1 + 1) == '[') {
1958 } else if (*s1 == '-') { /* remember to add some error checking to all this! */
1959 char s3 = *(s1 - 1);
1960 char s4 = *(s1 + 1);
1961 for (s3++; s3 <= s4; s3++) {
1965 } else if (*s1 == '\0') {
1966 ast_log(LOG_WARNING, "A matching ']' was not found for '[' in pattern string '%s'\n", extenbuf);
1972 *s2 = 0; /* null terminate the exploded range */
1973 /* sort the characters */
1975 specif = strlen(buf);
1976 qsort(buf, specif, 1, compare_char);
1985 if (*s1 == 'n') { /* make sure n,x,z patterns are canonicalized to N,X,Z */
1987 } else if (*s1 == 'x') {
1989 } else if (*s1 == 'z') {
1999 if (already && (m2 = already_in_tree(m1, buf, pattern)) && m2->next_char) {
2000 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...
2001 a shorter pattern might win if the longer one doesn't match */
2003 ast_log(LOG_WARNING, "Found duplicate exten. Had %s found %s\n", m2->exten->exten, e1->exten);
2008 m1 = m2->next_char; /* m1 points to the node to compare against */
2009 m0 = &m2->next_char; /* m0 points to the ptr that points to m1 */
2010 } else { /* not already OR not m2 OR nor m2->next_char */
2015 m1 = m2; /* while m0 stays the same */
2020 if (!(m1 = add_pattern_node(con, m1, buf, pattern, already,specif, m0))) { /* m1 is the node just added */
2023 m0 = &m1->next_char;
2026 if (m2 && m2->exten) {
2027 ast_log(LOG_WARNING, "Found duplicate exten. Had %s found %s\n", m2->exten->exten, e1->exten);
2033 /* The 'already' variable is a mini-optimization designed to make it so that we
2034 * don't have to call already_in_tree when we know it will return false.
2038 s1++; /* advance to next char */
2043 static void create_match_char_tree(struct ast_context *con)
2045 struct ast_hashtab_iter *t1;
2046 struct ast_exten *e1;
2048 int biggest_bucket, resizes, numobjs, numbucks;
2050 ast_log(LOG_DEBUG,"Creating Extension Trie for context %s(%p)\n", con->name, con);
2051 ast_hashtab_get_stats(con->root_table, &biggest_bucket, &resizes, &numobjs, &numbucks);
2052 ast_log(LOG_DEBUG,"This tree has %d objects in %d bucket lists, longest list=%d objects, and has resized %d times\n",
2053 numobjs, numbucks, biggest_bucket, resizes);
2055 t1 = ast_hashtab_start_traversal(con->root_table);
2056 while ((e1 = ast_hashtab_next(t1))) {
2058 add_exten_to_pattern_tree(con, e1, 0);
2060 ast_log(LOG_ERROR, "Attempt to create extension with no extension name.\n");
2063 ast_hashtab_end_traversal(t1);
2066 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! */
2068 /* destroy all the alternates */
2069 if (pattern_tree->alt_char) {
2070 destroy_pattern_tree(pattern_tree->alt_char);
2071 pattern_tree->alt_char = 0;
2073 /* destroy all the nexts */
2074 if (pattern_tree->next_char) {
2075 destroy_pattern_tree(pattern_tree->next_char);
2076 pattern_tree->next_char = 0;
2078 pattern_tree->exten = 0; /* never hurts to make sure there's no pointers laying around */
2079 ast_free(pattern_tree);
2083 * Special characters used in patterns:
2084 * '_' underscore is the leading character of a pattern.
2085 * In other position it is treated as a regular char.
2086 * . one or more of any character. Only allowed at the end of
2088 * ! zero or more of anything. Also impacts the result of CANMATCH
2089 * and MATCHMORE. Only allowed at the end of a pattern.
2090 * In the core routine, ! causes a match with a return code of 2.
2091 * In turn, depending on the search mode: (XXX check if it is implemented)
2092 * - E_MATCH retuns 1 (does match)
2093 * - E_MATCHMORE returns 0 (no match)
2094 * - E_CANMATCH returns 1 (does match)
2096 * / should not appear as it is considered the separator of the CID info.
2097 * XXX at the moment we may stop on this char.
2099 * X Z N match ranges 0-9, 1-9, 2-9 respectively.
2100 * [ denotes the start of a set of character. Everything inside
2101 * is considered literally. We can have ranges a-d and individual
2102 * characters. A '[' and '-' can be considered literally if they
2103 * are just before ']'.
2104 * XXX currently there is no way to specify ']' in a range, nor \ is
2105 * considered specially.
2107 * When we compare a pattern with a specific extension, all characters in the extension
2108 * itself are considered literally.
2109 * XXX do we want to consider space as a separator as well ?
2110 * XXX do we want to consider the separators in non-patterns as well ?
2114 * \brief helper functions to sort extensions and patterns in the desired way,
2115 * so that more specific patterns appear first.
2117 * ext_cmp1 compares individual characters (or sets of), returning
2118 * an int where bits 0-7 are the ASCII code of the first char in the set,
2119 * while bit 8-15 are the cardinality of the set minus 1.
2120 * This way more specific patterns (smaller cardinality) appear first.
2121 * Wildcards have a special value, so that we can directly compare them to
2122 * sets by subtracting the two values. In particular:
2123 * 0x000xx one character, xx
2124 * 0x0yyxx yy character set starting with xx
2125 * 0x10000 '.' (one or more of anything)
2126 * 0x20000 '!' (zero or more of anything)
2127 * 0x30000 NUL (end of string)
2128 * 0x40000 error in set.
2129 * The pointer to the string is advanced according to needs.
2131 * 1. the empty set is equivalent to NUL.
2132 * 2. given that a full set has always 0 as the first element,
2133 * we could encode the special cases as 0xffXX where XX
2134 * is 1, 2, 3, 4 as used above.
2136 static int ext_cmp1(const char **p, unsigned char *bitwise)
2138 int c, cmin = 0xff, count = 0;
2141 /* load, sign extend and advance pointer until we find
2142 * a valid character.
2145 memset(bitwise, 0xff, 32);
2147 /* always return unless we have a set of chars */
2148 switch (toupper(c)) {
2149 default: /* ordinary character */
2150 return 0x0000 | (c & 0xff);
2152 case 'N': /* 2..9 */
2155 return 0x0800 | '2';
2157 case 'X': /* 0..9 */
2161 return 0x0A00 | '0';
2163 case 'Z': /* 1..9 */
2166 return 0x0900 | '1';
2168 case '.': /* wildcard */
2171 case '!': /* earlymatch */
2172 return 0x20000; /* less specific than NULL */
2174 case '\0': /* empty string */
2178 case '[': /* pattern */
2181 /* locate end of set */
2182 end = strchr(*p, ']');
2185 ast_log(LOG_WARNING, "Wrong usage of [] in the extension\n");
2186 return 0x40000; /* XXX make this entry go last... */
2189 for (; *p < end ; (*p)++) {
2190 unsigned char c1, c2; /* first-last char in range */
2191 c1 = (unsigned char)((*p)[0]);
2192 if (*p + 2 < end && (*p)[1] == '-') { /* this is a range */
2193 c2 = (unsigned char)((*p)[2]);
2194 *p += 2; /* skip a total of 3 chars */
2195 } else { /* individual character */
2201 for (; c1 <= c2; c1++) {
2202 unsigned char mask = 1 << (c1 % 8);
2203 /* Count the number of characters in the class, discarding duplicates. */
2204 if ( (bitwise[ c1 / 8 ] & mask) == 1) {
2207 /*!\note If two patterns score the same, but one includes '0' (as
2208 * the lowest ASCII value in the given class) and the other does
2209 * not, then the one including '0' will compare as coming first. */
2210 bitwise[ c1 / 8 ] &= ~mask;
2214 return count == 0 ? 0x30000 : (count | cmin);
2218 * \brief the full routine to compare extensions in rules.
2220 static int ext_cmp(const char *a, const char *b)
2222 /* make sure non-patterns come first.
2223 * If a is not a pattern, it either comes first or
2224 * we do a more complex pattern comparison.
2226 unsigned char bitwise[2][32];
2230 return (b[0] == '_') ? -1 : strcmp(a, b);
2232 /* Now we know a is a pattern; if b is not, a comes first */
2236 /* ok we need full pattern sorting routine */
2237 while (!ret && a && b) {
2238 ret = ext_cmp1(&a, bitwise[0]) - ext_cmp1(&b, bitwise[1]);
2240 /* Are the classes different, even though they score the same? */
2241 ret = memcmp(bitwise[0], bitwise[1], 32);
2247 return (ret > 0) ? 1 : -1;
2251 int ast_extension_cmp(const char *a, const char *b)
2253 return ext_cmp(a, b);
2258 * \brief used ast_extension_{match|close}
2259 * mode is as follows:
2260 * E_MATCH success only on exact match
2261 * E_MATCHMORE success only on partial match (i.e. leftover digits in pattern)
2262 * E_CANMATCH either of the above.
2263 * \retval 0 on no-match
2264 * \retval 1 on match
2265 * \retval 2 on early match.
2268 static int _extension_match_core(const char *pattern, const char *data, enum ext_match_t mode)
2270 mode &= E_MATCH_MASK; /* only consider the relevant bits */
2272 #ifdef NEED_DEBUG_HERE
2273 ast_log(LOG_NOTICE,"match core: pat: '%s', dat: '%s', mode=%d\n", pattern, data, (int)mode);
2276 if ( (mode == E_MATCH) && (pattern[0] == '_') && (!strcasecmp(pattern,data)) ) { /* note: if this test is left out, then _x. will not match _x. !!! */
2277 #ifdef NEED_DEBUG_HERE
2278 ast_log(LOG_NOTICE,"return (1) - pattern matches pattern\n");
2283 if (pattern[0] != '_') { /* not a pattern, try exact or partial match */
2284 int ld = strlen(data), lp = strlen(pattern);
2286 if (lp < ld) { /* pattern too short, cannot match */
2287 #ifdef NEED_DEBUG_HERE
2288 ast_log(LOG_NOTICE,"return (0) - pattern too short, cannot match\n");
2292 /* depending on the mode, accept full or partial match or both */
2293 if (mode == E_MATCH) {
2294 #ifdef NEED_DEBUG_HERE
2295 ast_log(LOG_NOTICE,"return (!strcmp(%s,%s) when mode== E_MATCH)\n", pattern, data);
2297 return !strcmp(pattern, data); /* 1 on match, 0 on fail */
2299 if (ld == 0 || !strncasecmp(pattern, data, ld)) { /* partial or full match */
2300 #ifdef NEED_DEBUG_HERE
2301 ast_log(LOG_NOTICE,"return (mode(%d) == E_MATCHMORE ? lp(%d) > ld(%d) : 1)\n", mode, lp, ld);
2303 return (mode == E_MATCHMORE) ? lp > ld : 1; /* XXX should consider '!' and '/' ? */
2305 #ifdef NEED_DEBUG_HERE
2306 ast_log(LOG_NOTICE,"return (0) when ld(%d) > 0 && pattern(%s) != data(%s)\n", ld, pattern, data);
2311 pattern++; /* skip leading _ */
2313 * XXX below we stop at '/' which is a separator for the CID info. However we should
2314 * not store '/' in the pattern at all. When we insure it, we can remove the checks.
2316 while (*data && *pattern && *pattern != '/') {
2319 if (*data == '-') { /* skip '-' in data (just a separator) */
2323 switch (toupper(*pattern)) {
2324 case '[': /* a range */
2325 end = strchr(pattern+1, ']'); /* XXX should deal with escapes ? */
2327 ast_log(LOG_WARNING, "Wrong usage of [] in the extension\n");
2328 return 0; /* unconditional failure */
2330 for (pattern++; pattern != end; pattern++) {
2331 if (pattern+2 < end && pattern[1] == '-') { /* this is a range */
2332 if (*data >= pattern[0] && *data <= pattern[2])
2333 break; /* match found */
2335 pattern += 2; /* skip a total of 3 chars */
2338 } else if (*data == pattern[0])
2339 break; /* match found */
2341 if (pattern == end) {
2342 #ifdef NEED_DEBUG_HERE
2343 ast_log(LOG_NOTICE,"return (0) when pattern==end\n");
2347 pattern = end; /* skip and continue */
2350 if (*data < '2' || *data > '9') {
2351 #ifdef NEED_DEBUG_HERE
2352 ast_log(LOG_NOTICE,"return (0) N is matched\n");
2358 if (*data < '0' || *data > '9') {
2359 #ifdef NEED_DEBUG_HERE
2360 ast_log(LOG_NOTICE,"return (0) X is matched\n");
2366 if (*data < '1' || *data > '9') {
2367 #ifdef NEED_DEBUG_HERE
2368 ast_log(LOG_NOTICE,"return (0) Z is matched\n");
2373 case '.': /* Must match, even with more digits */
2374 #ifdef NEED_DEBUG_HERE
2375 ast_log(LOG_NOTICE, "return (1) when '.' is matched\n");
2378 case '!': /* Early match */
2379 #ifdef NEED_DEBUG_HERE
2380 ast_log(LOG_NOTICE, "return (2) when '!' is matched\n");
2384 case '-': /* Ignore these in patterns */
2385 data--; /* compensate the final data++ */
2388 if (*data != *pattern) {
2389 #ifdef NEED_DEBUG_HERE
2390 ast_log(LOG_NOTICE, "return (0) when *data(%c) != *pattern(%c)\n", *data, *pattern);
2398 if (*data) /* data longer than pattern, no match */ {
2399 #ifdef NEED_DEBUG_HERE
2400 ast_log(LOG_NOTICE, "return (0) when data longer than pattern\n");
2406 * match so far, but ran off the end of the data.
2407 * Depending on what is next, determine match or not.
2409 if (*pattern == '\0' || *pattern == '/') { /* exact match */
2410 #ifdef NEED_DEBUG_HERE
2411 ast_log(LOG_NOTICE, "at end, return (%d) in 'exact match'\n", (mode==E_MATCHMORE) ? 0 : 1);
2413 return (mode == E_MATCHMORE) ? 0 : 1; /* this is a failure for E_MATCHMORE */
2414 } else if (*pattern == '!') { /* early match */
2415 #ifdef NEED_DEBUG_HERE
2416 ast_log(LOG_NOTICE, "at end, return (2) when '!' is matched\n");
2419 } else { /* partial match */
2420 #ifdef NEED_DEBUG_HERE
2421 ast_log(LOG_NOTICE, "at end, return (%d) which deps on E_MATCH\n", (mode == E_MATCH) ? 0 : 1);
2423 return (mode == E_MATCH) ? 0 : 1; /* this is a failure for E_MATCH */
2428 * Wrapper around _extension_match_core() to do performance measurement
2429 * using the profiling code.
2431 static int extension_match_core(const char *pattern, const char *data, enum ext_match_t mode)
2434 static int prof_id = -2; /* marker for 'unallocated' id */
2435 if (prof_id == -2) {
2436 prof_id = ast_add_profile("ext_match", 0);
2438 ast_mark(prof_id, 1);
2439 i = _extension_match_core(pattern, data, mode);
2440 ast_mark(prof_id, 0);
2444 int ast_extension_match(const char *pattern, const char *data)
2446 return extension_match_core(pattern, data, E_MATCH);
2449 int ast_extension_close(const char *pattern, const char *data, int needmore)
2451 if (needmore != E_MATCHMORE && needmore != E_CANMATCH)
2452 ast_log(LOG_WARNING, "invalid argument %d\n", needmore);
2453 return extension_match_core(pattern, data, needmore);
2456 struct fake_context /* this struct is purely for matching in the hashtab */
2459 struct ast_exten *root;
2460 struct ast_hashtab *root_table;
2461 struct match_char *pattern_tree;
2462 struct ast_context *next;
2463 struct ast_include *includes;
2464 struct ast_ignorepat *ignorepats;
2465 const char *registrar;
2467 AST_LIST_HEAD_NOLOCK(, ast_sw) alts;
2468 ast_mutex_t macrolock;
2472 struct ast_context *ast_context_find(const char *name)
2474 struct ast_context *tmp = NULL;
2475 struct fake_context item;
2477 ast_copy_string(item.name, name, sizeof(item.name));
2479 ast_rdlock_contexts();
2480 if( contexts_table ) {
2481 tmp = ast_hashtab_lookup(contexts_table,&item);
2483 while ( (tmp = ast_walk_contexts(tmp)) ) {
2484 if (!name || !strcasecmp(name, tmp->name)) {
2489 ast_unlock_contexts();
2493 #define STATUS_NO_CONTEXT 1
2494 #define STATUS_NO_EXTENSION 2
2495 #define STATUS_NO_PRIORITY 3
2496 #define STATUS_NO_LABEL 4
2497 #define STATUS_SUCCESS 5
2499 static int matchcid(const char *cidpattern, const char *callerid)
2501 /* If the Caller*ID pattern is empty, then we're matching NO Caller*ID, so
2502 failing to get a number should count as a match, otherwise not */
2504 if (ast_strlen_zero(callerid)) {
2505 return ast_strlen_zero(cidpattern) ? 1 : 0;
2508 return ast_extension_match(cidpattern, callerid);
2511 struct ast_exten *pbx_find_extension(struct ast_channel *chan,
2512 struct ast_context *bypass, struct pbx_find_info *q,
2513 const char *context, const char *exten, int priority,
2514 const char *label, const char *callerid, enum ext_match_t action)
2517 struct ast_context *tmp = NULL;
2518 struct ast_exten *e = NULL, *eroot = NULL;
2519 struct ast_include *i = NULL;
2520 struct ast_sw *sw = NULL;
2521 struct ast_exten pattern = {NULL, };
2522 struct scoreboard score = {0, };
2523 struct ast_str *tmpdata = NULL;
2525 pattern.label = label;
2526 pattern.priority = priority;
2527 #ifdef NEED_DEBUG_HERE
2528 ast_log(LOG_NOTICE, "Looking for cont/ext/prio/label/action = %s/%s/%d/%s/%d\n", context, exten, priority, label, (int) action);
2531 /* Initialize status if appropriate */
2532 if (q->stacklen == 0) {
2533 q->status = STATUS_NO_CONTEXT;
2536 q->foundcontext = NULL;
2537 } else if (q->stacklen >= AST_PBX_MAX_STACK) {
2538 ast_log(LOG_WARNING, "Maximum PBX stack exceeded\n");
2542 /* Check first to see if we've already been checked */
2543 for (x = 0; x < q->stacklen; x++) {
2544 if (!strcasecmp(q->incstack[x], context))
2548 if (bypass) { /* bypass means we only look there */
2550 } else { /* look in contexts */
2551 struct fake_context item;
2553 ast_copy_string(item.name, context, sizeof(item.name));
2555 tmp = ast_hashtab_lookup(contexts_table, &item);
2561 if (q->status < STATUS_NO_EXTENSION)
2562 q->status = STATUS_NO_EXTENSION;
2564 /* Do a search for matching extension */
2567 score.total_specificity = 0;
2569 score.total_length = 0;
2570 if (!tmp->pattern_tree && tmp->root_table) {
2571 create_match_char_tree(tmp);
2573 ast_log(LOG_DEBUG, "Tree Created in context %s:\n", context);
2574 log_match_char_tree(tmp->pattern_tree," ");
2578 ast_log(LOG_NOTICE, "The Trie we are searching in:\n");
2579 log_match_char_tree(tmp->pattern_tree, ":: ");
2583 if (!ast_strlen_zero(overrideswitch)) {
2584 char *osw = ast_strdupa(overrideswitch), *name;
2585 struct ast_switch *asw;
2586 ast_switch_f *aswf = NULL;
2590 name = strsep(&osw, "/");
2591 asw = pbx_findswitch(name);
2594 ast_log(LOG_WARNING, "No such switch '%s'\n", name);
2598 if (osw && strchr(osw, '$')) {
2602 if (eval && !(tmpdata = ast_str_thread_get(&switch_data, 512))) {
2603 ast_log(LOG_WARNING, "Can't evaluate overrideswitch?!");
2606 /* Substitute variables now */
2607 pbx_substitute_variables_helper(chan, osw, ast_str_buffer(tmpdata), ast_str_size(tmpdata));
2608 datap = ast_str_buffer(tmpdata);
2613 /* equivalent of extension_match_core() at the switch level */
2614 if (action == E_CANMATCH)
2615 aswf = asw->canmatch;
2616 else if (action == E_MATCHMORE)
2617 aswf = asw->matchmore;
2618 else /* action == E_MATCH */
2624 ast_autoservice_start(chan);
2626 res = aswf(chan, context, exten, priority, callerid, datap);
2628 ast_autoservice_stop(chan);
2631 if (res) { /* Got a match */
2634 q->foundcontext = context;
2635 /* XXX keep status = STATUS_NO_CONTEXT ? */
2641 if (extenpatternmatchnew) {
2642 new_find_extension(exten, &score, tmp->pattern_tree, 0, 0, callerid, label, action);
2643 eroot = score.exten;
2645 if (score.last_char == '!' && action == E_MATCHMORE) {
2646 /* We match an extension ending in '!'.
2647 * The decision in this case is final and is NULL (no match).
2649 #ifdef NEED_DEBUG_HERE
2650 ast_log(LOG_NOTICE,"Returning MATCHMORE NULL with exclamation point.\n");
2655 if (!eroot && (action == E_CANMATCH || action == E_MATCHMORE) && score.canmatch_exten) {
2656 q->status = STATUS_SUCCESS;
2657 #ifdef NEED_DEBUG_HERE
2658 ast_log(LOG_NOTICE,"Returning CANMATCH exten %s\n", score.canmatch_exten->exten);
2660 return score.canmatch_exten;
2663 if ((action == E_MATCHMORE || action == E_CANMATCH) && eroot) {
2665 struct ast_exten *z = trie_find_next_match(score.node);
2667 #ifdef NEED_DEBUG_HERE
2668 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE next_match exten %s\n", z->exten);
2671 if (score.canmatch_exten) {
2672 #ifdef NEED_DEBUG_HERE
2673 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE canmatchmatch exten %s(%p)\n", score.canmatch_exten->exten, score.canmatch_exten);
2675 return score.canmatch_exten;
2677 #ifdef NEED_DEBUG_HERE
2678 ast_log(LOG_NOTICE,"Returning CANMATCH/MATCHMORE next_match exten NULL\n");
2684 #ifdef NEED_DEBUG_HERE
2685 ast_log(LOG_NOTICE, "Returning CANMATCH/MATCHMORE NULL (no next_match)\n");
2687 return NULL; /* according to the code, complete matches are null matches in MATCHMORE mode */
2691 /* found entry, now look for the right priority */
2692 if (q->status < STATUS_NO_PRIORITY)
2693 q->status = STATUS_NO_PRIORITY;
2695 if (action == E_FINDLABEL && label ) {
2696 if (q->status < STATUS_NO_LABEL)
2697 q->status = STATUS_NO_LABEL;
2698 e = ast_hashtab_lookup(eroot->peer_label_table, &pattern);
2700 e = ast_hashtab_lookup(eroot->peer_table, &pattern);
2702 if (e) { /* found a valid match */
2703 q->status = STATUS_SUCCESS;
2704 q->foundcontext = context;
2705 #ifdef NEED_DEBUG_HERE
2706 ast_log(LOG_NOTICE,"Returning complete match of exten %s\n", e->exten);
2711 } else { /* the old/current default exten pattern match algorithm */
2713 /* scan the list trying to match extension and CID */
2715 while ( (eroot = ast_walk_context_extensions(tmp, eroot)) ) {
2716 int match = extension_match_core(eroot->exten, exten, action);
2717 /* 0 on fail, 1 on match, 2 on earlymatch */
2719 if (!match || (eroot->matchcid && !matchcid(eroot->cidmatch, callerid)))
2720 continue; /* keep trying */
2721 if (match == 2 && action == E_MATCHMORE) {
2722 /* We match an extension ending in '!'.
2723 * The decision in this case is final and is NULL (no match).
2727 /* found entry, now look for the right priority */
2728 if (q->status < STATUS_NO_PRIORITY)
2729 q->status = STATUS_NO_PRIORITY;
2731 if (action == E_FINDLABEL && label ) {
2732 if (q->status < STATUS_NO_LABEL)
2733 q->status = STATUS_NO_LABEL;
2734 e = ast_hashtab_lookup(eroot->peer_label_table, &pattern);
2736 e = ast_hashtab_lookup(eroot->peer_table, &pattern);
2738 if (e) { /* found a valid match */
2739 q->status = STATUS_SUCCESS;
2740 q->foundcontext = context;
2746 /* Check alternative switches */
2747 AST_LIST_TRAVERSE(&tmp->alts, sw, list) {
2748 struct ast_switch *asw = pbx_findswitch(sw->name);
2749 ast_switch_f *aswf = NULL;
2753 ast_log(LOG_WARNING, "No such switch '%s'\n", sw->name);
2757 /* Substitute variables now */
2759 if (!(tmpdata = ast_str_thread_get(&switch_data, 512))) {
2760 ast_log(LOG_WARNING, "Can't evaluate switch?!");
2763 pbx_substitute_variables_helper(chan, sw->data, ast_str_buffer(tmpdata), ast_str_size(tmpdata));
2766 /* equivalent of extension_match_core() at the switch level */
2767 if (action == E_CANMATCH)
2768 aswf = asw->canmatch;
2769 else if (action == E_MATCHMORE)
2770 aswf = asw->matchmore;
2771 else /* action == E_MATCH */
2773 datap = sw->eval ? ast_str_buffer(tmpdata) : sw->data;
2778 ast_autoservice_start(chan);
2779 res = aswf(chan, context, exten, priority, callerid, datap);
2781 ast_autoservice_stop(chan);
2783 if (res) { /* Got a match */
2786 q->foundcontext = context;
2787 /* XXX keep status = STATUS_NO_CONTEXT ? */
2791 q->incstack[q->stacklen++] = tmp->name; /* Setup the stack */
2792 /* Now try any includes we have in this context */
2793 for (i = tmp->includes; i; i = i->next) {
2794 if (include_valid(i)) {
2795 if ((e = pbx_find_extension(chan, bypass, q, i->rname, exten, priority, label, callerid, action))) {
2796 #ifdef NEED_DEBUG_HERE
2797 ast_log(LOG_NOTICE,"Returning recursive match of %s\n", e->exten);
2809 * \brief extract offset:length from variable name.
2810 * \return 1 if there is a offset:length part, which is
2811 * trimmed off (values go into variables)
2813 static int parse_variable_name(char *var, int *offset, int *length, int *isfunc)
2820 for (; *var; var++) {
2824 } else if (*var == ')') {
2826 } else if (*var == ':' && parens == 0) {
2828 sscanf(var, "%30d:%30d", offset, length);
2829 return 1; /* offset:length valid */
2836 *\brief takes a substring. It is ok to call with value == workspace.
2838 * \param offset < 0 means start from the end of the string and set the beginning
2839 * to be that many characters back.
2840 * \param length is the length of the substring, a value less than 0 means to leave
2841 * that many off the end.
2843 * \param workspace_len
2844 * Always return a copy in workspace.
2846 static char *substring(const char *value, int offset, int length, char *workspace, size_t workspace_len)
2848 char *ret = workspace;
2849 int lr; /* length of the input string after the copy */
2851 ast_copy_string(workspace, value, workspace_len); /* always make a copy */
2853 lr = strlen(ret); /* compute length after copy, so we never go out of the workspace */
2855 /* Quick check if no need to do anything */
2856 if (offset == 0 && length >= lr) /* take the whole string */
2859 if (offset < 0) { /* translate negative offset into positive ones */
2860 offset = lr + offset;
2861 if (offset < 0) /* If the negative offset was greater than the length of the string, just start at the beginning */
2865 /* too large offset result in empty string so we know what to return */
2867 return ret + lr; /* the final '\0' */
2869 ret += offset; /* move to the start position */
2870 if (length >= 0 && length < lr - offset) /* truncate if necessary */
2872 else if (length < 0) {
2873 if (lr > offset - length) /* After we remove from the front and from the rear, is there anything left? */
2874 ret[lr + length - offset] = '\0';
2882 static const char *ast_str_substring(struct ast_str *value, int offset, int length)
2884 int lr; /* length of the input string after the copy */
2886 lr = ast_str_strlen(value); /* compute length after copy, so we never go out of the workspace */
2888 /* Quick check if no need to do anything */
2889 if (offset == 0 && length >= lr) /* take the whole string */
2890 return ast_str_buffer(value);
2892 if (offset < 0) { /* translate negative offset into positive ones */
2893 offset = lr + offset;
2894 if (offset < 0) /* If the negative offset was greater than the length of the string, just start at the beginning */
2898 /* too large offset result in empty string so we know what to return */
2900 ast_str_reset(value);
2901 return ast_str_buffer(value);
2905 /* Go ahead and chop off the beginning */
2906 memcpy(ast_str_buffer(value), ast_str_buffer(value) + offset, ast_str_strlen(value) - offset + 1);
2910 if (length >= 0 && length < lr) { /* truncate if necessary */
2911 char *tmp = ast_str_buffer(value);
2913 ast_str_update(value);
2914 } else if (length < 0) {
2915 if (lr > -length) { /* After we remove from the front and from the rear, is there anything left? */
2916 char *tmp = ast_str_buffer(value);
2917 tmp[lr + length] = '\0';
2918 ast_str_update(value);
2920 ast_str_reset(value);
2923 /* Nothing to do, but update the buffer length */
2924 ast_str_update(value);
2927 return ast_str_buffer(value);
2930 /*! \brief Support for Asterisk built-in variables in the dialplan
2933 - \ref AstVar Channel variables
2934 - \ref AstCauses The HANGUPCAUSE variable
2936 void pbx_retrieve_variable(struct ast_channel *c, const char *var, char **ret, char *workspace, int workspacelen, struct varshead *headp)
2938 struct ast_str *str = ast_str_create(16);
2941 cret = ast_str_retrieve_variable(&str, 0, c, headp, var);
2942 ast_copy_string(workspace, ast_str_buffer(str), workspacelen);
2943 *ret = cret ? workspace : NULL;
2947 const char *ast_str_retrieve_variable(struct ast_str **str, ssize_t maxlen, struct ast_channel *c, struct varshead *headp, const char *var)
2949 const char not_found = '\0';
2952 const char *s; /* the result */
2954 int i, need_substring;
2955 struct varshead *places[2] = { headp, &globals }; /* list of places where we may look */
2958 ast_channel_lock(c);
2959 places[0] = &c->varshead;
2962 * Make a copy of var because parse_variable_name() modifies the string.
2963 * Then if called directly, we might need to run substring() on the result;
2964 * remember this for later in 'need_substring', 'offset' and 'length'
2966 tmpvar = ast_strdupa(var); /* parse_variable_name modifies the string */
2967 need_substring = parse_variable_name(tmpvar, &offset, &length, &i /* ignored */);
2970 * Look first into predefined variables, then into variable lists.
2971 * Variable 's' points to the result, according to the following rules:
2972 * s == ¬_found (set at the beginning) means that we did not find a
2973 * matching variable and need to look into more places.
2974 * If s != ¬_found, s is a valid result string as follows:
2975 * s = NULL if the variable does not have a value;
2976 * you typically do this when looking for an unset predefined variable.
2977 * s = workspace if the result has been assembled there;
2978 * typically done when the result is built e.g. with an snprintf(),
2979 * so we don't need to do an additional copy.
2980 * s != workspace in case we have a string, that needs to be copied
2981 * (the ast_copy_string is done once for all at the end).
2982 * Typically done when the result is already available in some string.
2984 s = ¬_found; /* default value */
2985 if (c) { /* This group requires a valid channel */
2986 /* Names with common parts are looked up a piece at a time using strncmp. */
2987 if (!strncmp(var, "CALL", 4)) {
2988 if (!strncmp(var + 4, "ING", 3)) {
2989 if (!strcmp(var + 7, "PRES")) { /* CALLINGPRES */
2990 ast_str_set(str, maxlen, "%d", c->cid.cid_pres);
2991 s = ast_str_buffer(*str);
2992 } else if (!strcmp(var + 7, "ANI2")) { /* CALLINGANI2 */
2993 ast_str_set(str, maxlen, "%d", c->cid.cid_ani2);
2994 s = ast_str_buffer(*str);
2995 } else if (!strcmp(var + 7, "TON")) { /* CALLINGTON */
2996 ast_str_set(str, maxlen, "%d", c->cid.cid_ton);
2997 s = ast_str_buffer(*str);
2998 } else if (!strcmp(var + 7, "TNS")) { /* CALLINGTNS */
2999 ast_str_set(str, maxlen, "%d", c->cid.cid_tns);
3000 s = ast_str_buffer(*str);
3003 } else if (!strcmp(var, "HINT")) {
3004 s = ast_str_get_hint(str, maxlen, NULL, 0, c, c->context, c->exten) ? ast_str_buffer(*str) : NULL;
3005 } else if (!strcmp(var, "HINTNAME")) {
3006 s = ast_str_get_hint(NULL, 0, str, maxlen, c, c->context, c->exten) ? ast_str_buffer(*str) : NULL;
3007 } else if (!strcmp(var, "EXTEN")) {
3009 } else if (!strcmp(var, "CONTEXT")) {
3011 } else if (!strcmp(var, "PRIORITY")) {
3012 ast_str_set(str, maxlen, "%d", c->priority);
3013 s = ast_str_buffer(*str);
3014 } else if (!strcmp(var, "CHANNEL")) {
3016 } else if (!strcmp(var, "UNIQUEID")) {
3018 } else if (!strcmp(var, "HANGUPCAUSE")) {
3019 ast_str_set(str, maxlen, "%d", c->hangupcause);
3020 s = ast_str_buffer(*str);
3023 if (s == ¬_found) { /* look for more */
3024 if (!strcmp(var, "EPOCH")) {
3025 ast_str_set(str, maxlen, "%u", (int) time(NULL));
3026 s = ast_str_buffer(*str);
3027 } else if (!strcmp(var, "SYSTEMNAME")) {
3028 s = ast_config_AST_SYSTEM_NAME;
3029 } else if (!strcmp(var, "ENTITYID")) {
3031 ast_eid_to_str(workspace, sizeof(workspace), &ast_eid_default);
3035 /* if not found, look into chanvars or global vars */
3036 for (i = 0; s == ¬_found && i < ARRAY_LEN(places); i++) {
3037 struct ast_var_t *variables;
3040 if (places[i] == &globals)
3041 ast_rwlock_rdlock(&globalslock);
3042 AST_LIST_TRAVERSE(places[i], variables, entries) {
3043 if (!strcasecmp(ast_var_name(variables), var)) {
3044 s = ast_var_value(variables);
3048 if (places[i] == &globals)
3049 ast_rwlock_unlock(&globalslock);
3051 if (s == ¬_found || s == NULL) {
3052 ast_debug(5, "Result of '%s' is NULL\n", var);
3055 ast_debug(5, "Result of '%s' is '%s'\n", var, s);
3056 if (s != ast_str_buffer(*str)) {
3057 ast_str_set(str, maxlen, "%s", s);
3059 ret = ast_str_buffer(*str);
3060 if (need_substring) {
3061 ret = ast_str_substring(*str, offset, length);
3062 ast_debug(2, "Final result of '%s' is '%s'\n", var, ret);
3067 ast_channel_unlock(c);
3072 static void exception_store_free(void *data)
3074 struct pbx_exception *exception = data;
3075 ast_string_field_free_memory(exception);
3076 ast_free(exception);
3079 static struct ast_datastore_info exception_store_info = {
3080 .type = "EXCEPTION",
3081 .destroy = exception_store_free,
3084 int pbx_builtin_raise_exception(struct ast_channel *chan, const char *reason)
3086 struct ast_datastore *ds = ast_channel_datastore_find(chan, &exception_store_info, NULL);
3087 struct pbx_exception *exception = NULL;
3090 ds = ast_datastore_alloc(&exception_store_info, NULL);
3093 exception = ast_calloc(1, sizeof(struct pbx_exception));
3095 ast_datastore_free(ds);
3098 if (ast_string_field_init(exception, 128)) {
3099 ast_free(exception);
3100 ast_datastore_free(ds);
3103 ds->data = exception;
3104 ast_channel_datastore_add(chan, ds);
3106 exception = ds->data;
3108 ast_string_field_set(exception, reason, reason);
3109 ast_string_field_set(exception, context, chan->context);
3110 ast_string_field_set(exception, exten, chan->exten);
3111 exception->priority = chan->priority;
3112 set_ext_pri(chan, "e", 0);
3116 static int acf_exception_read(struct ast_channel *chan, const char *name, char *data, char *buf, size_t buflen)
3118 struct ast_datastore *ds = ast_channel_datastore_find(chan, &exception_store_info, NULL);
3119 struct pbx_exception *exception = NULL;
3120 if (!ds || !ds->data)
3122 exception = ds->data;
3123 if (!strcasecmp(data, "REASON"))
3124 ast_copy_string(buf, exception->reason, buflen);
3125 else if (!strcasecmp(data, "CONTEXT"))
3126 ast_copy_string(buf, exception->context, buflen);
3127 else if (!strncasecmp(data, "EXTEN", 5))
3128 ast_copy_string(buf, exception->exten, buflen);
3129 else if (!strcasecmp(data, "PRIORITY"))
3130 snprintf(buf, buflen, "%d", exception->priority);
3136 static struct ast_custom_function exception_function = {
3137 .name = "EXCEPTION",
3138 .read = acf_exception_read,
3141 static char *handle_show_functions(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
3143 struct ast_custom_function *acf;
3149 e->command = "core show functions [like]";
3151 "Usage: core show functions [like <text>]\n"
3152 " List builtin functions, optionally only those matching a given string\n";
3158 if (a->argc == 5 && (!strcmp(a->argv[3], "like")) ) {
3160 } else if (a->argc != 3) {
3161 return CLI_SHOWUSAGE;
3164 ast_cli(a->fd, "%s Custom Functions:\n--------------------------------------------------------------------------------\n", like ? "Matching" : "Installed");
3166 AST_RWLIST_RDLOCK(&acf_root);
3167 AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
3168 if (!like || strstr(acf->name, a->argv[4])) {
3170 ast_cli(a->fd, "%-20.20s %-35.35s %s\n", acf->name, acf->syntax, acf->synopsis);
3173 AST_RWLIST_UNLOCK(&acf_root);
3175 ast_cli(a->fd, "%d %scustom functions installed.\n", count_acf, like ? "matching " : "");
3180 static char *handle_show_function(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
3182 struct ast_custom_function *acf;
3183 /* Maximum number of characters added by terminal coloring is 22 */
3184 char infotitle[64 + AST_MAX_APP + 22], syntitle[40], destitle[40], argtitle[40], seealsotitle[40];
3185 char info[64 + AST_MAX_APP], *synopsis = NULL, *description = NULL, *seealso = NULL;
3186 char stxtitle[40], *syntax = NULL, *arguments = NULL;
3187 int syntax_size, description_size, synopsis_size, arguments_size, seealso_size;
3194 e->command = "core show function";
3196 "Usage: core show function <function>\n"
3197 " Describe a particular dialplan function.\n";
3200 wordlen = strlen(a->word);
3201 /* case-insensitive for convenience in this 'complete' function */
3202 AST_RWLIST_RDLOCK(&acf_root);
3203 AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
3204 if (!strncasecmp(a->word, acf->name, wordlen) && ++which > a->n) {
3205 ret = ast_strdup(acf->name);
3209 AST_RWLIST_UNLOCK(&acf_root);
3215 return CLI_SHOWUSAGE;
3218 if (!(acf = ast_custom_function_find(a->argv[3]))) {
3219 ast_cli(a->fd, "No function by that name registered.\n");
3223 syntax_size = strlen(S_OR(acf->syntax, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
3224 if (!(syntax = ast_malloc(syntax_size))) {
3225 ast_cli(a->fd, "Memory allocation failure!\n");
3229 snprintf(info, sizeof(info), "\n -= Info about function '%s' =- \n\n", acf->name);
3230 term_color(infotitle, info, COLOR_MAGENTA, 0, sizeof(infotitle));
3231 term_color(syntitle, "[Synopsis]\n", COLOR_MAGENTA, 0, 40);
3232 term_color(destitle, "[Description]\n", COLOR_MAGENTA, 0, 40);
3233 term_color(stxtitle, "[Syntax]\n", COLOR_MAGENTA, 0, 40);
3234 term_color(argtitle, "[Arguments]\n", COLOR_MAGENTA, 0, 40);
3235 term_color(seealsotitle, "[See Also]\n", COLOR_MAGENTA, 0, 40);
3236 term_color(syntax, S_OR(acf->syntax, "Not available"), COLOR_CYAN, 0, syntax_size);
3238 if (acf->docsrc == AST_XML_DOC) {
3239 arguments = ast_xmldoc_printable(S_OR(acf->arguments, "Not available"), 1);
3240 synopsis = ast_xmldoc_printable(S_OR(acf->synopsis, "Not available"), 1);
3241 description = ast_xmldoc_printable(S_OR(acf->desc, "Not available"), 1);
3242 seealso = ast_xmldoc_printable(S_OR(acf->seealso, "Not available"), 1);
3246 synopsis_size = strlen(S_OR(acf->synopsis, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
3247 synopsis = ast_malloc(synopsis_size);
3249 description_size = strlen(S_OR(acf->desc, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
3250 description = ast_malloc(description_size);
3252 arguments_size = strlen(S_OR(acf->arguments, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
3253 arguments = ast_malloc(arguments_size);
3255 seealso_size = strlen(S_OR(acf->seealso, "Not Available")) + AST_TERM_MAX_ESCAPE_CHARS;
3256 seealso = ast_malloc(seealso_size);
3258 /* check allocated memory. */
3259 if (!synopsis || !description || !arguments || !seealso) {
3261 ast_free(description);
3262 ast_free(arguments);
3268 term_color(arguments, S_OR(acf->arguments, "Not available"), COLOR_CYAN, 0, arguments_size);
3269 term_color(synopsis, S_OR(acf->synopsis, "Not available"), COLOR_CYAN, 0, synopsis_size);
3270 term_color(description, S_OR(acf->desc, "Not available"), COLOR_CYAN, 0, description_size);
3271 term_color(seealso, S_OR(acf->seealso, "Not available"), COLOR_CYAN, 0, seealso_size);
3274 ast_cli(a->fd, "%s%s%s\n\n%s%s\n\n%s%s\n\n%s%s\n\n%s%s\n",
3275 infotitle, syntitle, synopsis, destitle, description,
3276 stxtitle, syntax, argtitle, arguments, seealsotitle, seealso);
3278 ast_free(arguments);
3280 ast_free(description);
3287 struct ast_custom_function *ast_custom_function_find(const char *name)
3289 struct ast_custom_function *acf = NULL;
3291 AST_RWLIST_RDLOCK(&acf_root);
3292 AST_RWLIST_TRAVERSE(&acf_root, acf, acflist) {
3293 if (!strcmp(name, acf->name))
3296 AST_RWLIST_UNLOCK(&acf_root);
3301 int ast_custom_function_unregister(struct ast_custom_function *acf)
3303 struct ast_custom_function *cur;
3309 AST_RWLIST_WRLOCK(&acf_root);