This patch makes a small rearrangement to only do dialplan lookups during loopback switches if the pattern matches. Prior to this patch, the dialplan lookups were always performed, even when the result would be discarded. Dialplan lookups can be very costly if remote switches - like DUNDi - are present. In those cases extension matching is sped up considerably, making the issue of lost digits more manageable. As collateral damage, 6 trailing spaces were killed. Review: https://reviewboard.asterisk.org/r/4211 ASTERISK-24577 #close Reported by: Birger Harzenetter patches: ast-loopback.patch uploaded by Birger Harzenetter (License 5870) ........ Merged revisions 428787 from http://svn.asterisk.org/svn/asterisk/branches/11 ........ Merged revisions 428788 from http://svn.asterisk.org/svn/asterisk/branches/12 ........ Merged revisions 428789 from http://svn.asterisk.org/svn/asterisk/branches/13 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@428790 65c4cc65-6c06-0410-ace0-fbb531ad65f3
194 lines
5.8 KiB
C
194 lines
5.8 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Loopback PBX Module
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*
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/file.h"
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#include "asterisk/logger.h"
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#include "asterisk/channel.h"
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#include "asterisk/config.h"
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#include "asterisk/pbx.h"
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#include "asterisk/module.h"
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#include "asterisk/frame.h"
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#include "asterisk/cli.h"
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#include "asterisk/lock.h"
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#include "asterisk/md5.h"
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#include "asterisk/linkedlists.h"
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#include "asterisk/chanvars.h"
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#include "asterisk/sched.h"
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#include "asterisk/io.h"
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#include "asterisk/utils.h"
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#include "asterisk/astdb.h"
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/* Loopback switch creates a 'tunnel' to another context. When extension
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lookups pass through the 'tunnel', Asterisk expressions can be used
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to modify the target extension, context, and priority in any way desired.
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If there is a match at the far end, execution jumps through the 'tunnel'
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to the matched context, extension, and priority.
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Global variables as well as ${CONTEXT}, ${EXTEN}, and ${PRIORITY} are
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available for substitution. After substitution Loopback expects to get
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a string of the form:
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[exten]@context[:priority][/extramatch]
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Where exten, context, and priority are another extension, context, and priority
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to lookup and "extramatch" is a dialplan extension pattern which the *original*
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number must match. If exten or priority are empty, the original values are
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used.
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Note that the search context MUST be a different context from the current
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context or the search will not succeed. This is intended to reduce the
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likelihood of loops (they're still possible if you try hard, so be careful!)
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*/
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#define LOOPBACK_COMMON \
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char buf[1024]; \
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int res; \
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char *newexten=(char *)exten, *newcontext=(char *)context; \
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int newpriority=priority; \
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char *newpattern=NULL; \
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loopback_subst(buf, sizeof(buf), exten, context, priority, data); \
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loopback_parse(&newexten, &newcontext, &newpriority, &newpattern, buf); \
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ast_debug(1, "Parsed into %s @ %s priority %d pattern %s\n", newexten, newcontext, newpriority, newpattern); \
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if (!strcasecmp(newcontext, context)) return -1
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static char *loopback_subst(char *buf, int buflen, const char *exten, const char *context, int priority, const char *data)
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{
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struct ast_var_t *newvariable;
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struct varshead headp;
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char tmp[80];
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snprintf(tmp, sizeof(tmp), "%d", priority);
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AST_LIST_HEAD_INIT_NOLOCK(&headp);
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if ((newvariable = ast_var_assign("EXTEN", exten))) {
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AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
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}
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if ((newvariable = ast_var_assign("CONTEXT", context))) {
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AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
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}
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if ((newvariable = ast_var_assign("PRIORITY", tmp))) {
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AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
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}
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/* Substitute variables */
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pbx_substitute_variables_varshead(&headp, data, buf, buflen);
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/* free the list */
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while ((newvariable = AST_LIST_REMOVE_HEAD(&headp, entries)))
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ast_var_delete(newvariable);
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return buf;
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}
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static void loopback_parse(char **newexten, char **newcontext, int *priority, char **newpattern, char *buf)
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{
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char *con;
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char *pri;
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*newpattern = strchr(buf, '/');
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if (*newpattern)
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*(*newpattern)++ = '\0';
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con = strchr(buf, '@');
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if (con) {
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*con++ = '\0';
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pri = strchr(con, ':');
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} else
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pri = strchr(buf, ':');
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if (!ast_strlen_zero(buf))
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*newexten = buf;
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if (!ast_strlen_zero(con))
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*newcontext = con;
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if (!ast_strlen_zero(pri))
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sscanf(pri, "%30d", priority);
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}
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static int loopback_exists(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
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{
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LOOPBACK_COMMON;
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if (newpattern && !ast_extension_match(newpattern, exten))
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res = 0;
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else
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res = ast_exists_extension(chan, newcontext, newexten, newpriority, callerid);
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return res;
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}
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static int loopback_canmatch(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
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{
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LOOPBACK_COMMON;
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if (newpattern && !ast_extension_match(newpattern, exten))
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res = 0;
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else
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res = ast_canmatch_extension(chan, newcontext, newexten, newpriority, callerid);
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return res;
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}
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static int loopback_exec(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
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{
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int found;
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LOOPBACK_COMMON;
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res = ast_spawn_extension(chan, newcontext, newexten, newpriority, callerid, &found, 0);
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return res;
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}
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static int loopback_matchmore(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
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{
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LOOPBACK_COMMON;
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if (newpattern && !ast_extension_match(newpattern, exten))
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res = 0;
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else
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res = ast_matchmore_extension(chan, newcontext, newexten, newpriority, callerid);
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return res;
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}
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static struct ast_switch loopback_switch =
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{
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.name = "Loopback",
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.description = "Loopback Dialplan Switch",
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.exists = loopback_exists,
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.canmatch = loopback_canmatch,
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.exec = loopback_exec,
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.matchmore = loopback_matchmore,
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};
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static int unload_module(void)
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{
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ast_unregister_switch(&loopback_switch);
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return 0;
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}
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static int load_module(void)
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{
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if (ast_register_switch(&loopback_switch))
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return AST_MODULE_LOAD_FAILURE;
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return AST_MODULE_LOAD_SUCCESS;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Loopback Switch");
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