(closes issue #18556) Reported by: kkm Review: https://reviewboard.asterisk.org/r/1071/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@306258 65c4cc65-6c06-0410-ace0-fbb531ad65f3
184 lines
5.8 KiB
C
184 lines
5.8 KiB
C
/*
|
|
* Asterisk -- An open source telephony toolkit.
|
|
*
|
|
* Copyright (C) 1999 - 2005, Digium, Inc.
|
|
*
|
|
* Mark Spencer <markster@digium.com>
|
|
*
|
|
* See http://www.asterisk.org for more information about
|
|
* the Asterisk project. Please do not directly contact
|
|
* any of the maintainers of this project for assistance;
|
|
* the project provides a web site, mailing lists and IRC
|
|
* channels for your use.
|
|
*
|
|
* This program is free software, distributed under the terms of
|
|
* the GNU General Public License Version 2. See the LICENSE file
|
|
* at the top of the source tree.
|
|
*/
|
|
|
|
/*! \file
|
|
*
|
|
* \brief Loopback PBX Module
|
|
*
|
|
*/
|
|
|
|
#include "asterisk.h"
|
|
|
|
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
|
|
|
|
#include "asterisk/file.h"
|
|
#include "asterisk/logger.h"
|
|
#include "asterisk/channel.h"
|
|
#include "asterisk/config.h"
|
|
#include "asterisk/pbx.h"
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/frame.h"
|
|
#include "asterisk/cli.h"
|
|
#include "asterisk/lock.h"
|
|
#include "asterisk/md5.h"
|
|
#include "asterisk/linkedlists.h"
|
|
#include "asterisk/chanvars.h"
|
|
#include "asterisk/sched.h"
|
|
#include "asterisk/io.h"
|
|
#include "asterisk/utils.h"
|
|
#include "asterisk/astdb.h"
|
|
|
|
|
|
/* Loopback switch creates a 'tunnel' to another context. When extension
|
|
lookups pass through the 'tunnel', Asterisk expressions can be used
|
|
to modify the target extension, context, and priority in any way desired.
|
|
If there is a match at the far end, execution jumps through the 'tunnel'
|
|
to the matched context, extension, and priority.
|
|
|
|
Global variables as well as ${CONTEXT}, ${EXTEN}, and ${PRIORITY} are
|
|
available for substitution. After substitution Loopback expects to get
|
|
a string of the form:
|
|
|
|
[exten]@context[:priority][/extramatch]
|
|
|
|
Where exten, context, and priority are another extension, context, and priority
|
|
to lookup and "extramatch" is a dialplan extension pattern which the *original*
|
|
number must match. If exten or priority are empty, the original values are
|
|
used.
|
|
|
|
Note that the search context MUST be a different context from the current
|
|
context or the search will not succeed. This is intended to reduce the
|
|
likelihood of loops (they're still possible if you try hard, so be careful!)
|
|
|
|
*/
|
|
|
|
|
|
#define LOOPBACK_COMMON \
|
|
char buf[1024]; \
|
|
int res; \
|
|
char *newexten=(char *)exten, *newcontext=(char *)context; \
|
|
int newpriority=priority; \
|
|
char *newpattern=NULL; \
|
|
loopback_subst(buf, sizeof(buf), exten, context, priority, data); \
|
|
loopback_parse(&newexten, &newcontext, &newpriority, &newpattern, buf); \
|
|
ast_debug(1, "Parsed into %s @ %s priority %d\n", newexten, newcontext, newpriority); \
|
|
if (!strcasecmp(newcontext, context)) return -1
|
|
|
|
static char *loopback_subst(char *buf, int buflen, const char *exten, const char *context, int priority, const char *data)
|
|
{
|
|
struct ast_var_t *newvariable;
|
|
struct varshead headp;
|
|
char tmp[80];
|
|
|
|
snprintf(tmp, sizeof(tmp), "%d", priority);
|
|
AST_LIST_HEAD_INIT_NOLOCK(&headp);
|
|
newvariable = ast_var_assign("EXTEN", exten);
|
|
AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
|
|
newvariable = ast_var_assign("CONTEXT", context);
|
|
AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
|
|
newvariable = ast_var_assign("PRIORITY", tmp);
|
|
AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
|
|
/* Substitute variables */
|
|
pbx_substitute_variables_varshead(&headp, data, buf, buflen);
|
|
/* free the list */
|
|
while ((newvariable = AST_LIST_REMOVE_HEAD(&headp, entries)))
|
|
ast_var_delete(newvariable);
|
|
return buf;
|
|
}
|
|
|
|
static void loopback_parse(char **newexten, char **newcontext, int *priority, char **newpattern, char *buf)
|
|
{
|
|
char *con;
|
|
char *pri;
|
|
*newpattern = strchr(buf, '/');
|
|
if (*newpattern)
|
|
*(*newpattern)++ = '\0';
|
|
con = strchr(buf, '@');
|
|
if (con) {
|
|
*con++ = '\0';
|
|
pri = strchr(con, ':');
|
|
} else
|
|
pri = strchr(buf, ':');
|
|
if (!ast_strlen_zero(buf))
|
|
*newexten = buf;
|
|
if (!ast_strlen_zero(con))
|
|
*newcontext = con;
|
|
if (!ast_strlen_zero(pri))
|
|
sscanf(pri, "%30d", priority);
|
|
}
|
|
|
|
static int loopback_exists(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
|
|
{
|
|
LOOPBACK_COMMON;
|
|
res = ast_exists_extension(chan, newcontext, newexten, newpriority, callerid);
|
|
if (newpattern && !ast_extension_match(newpattern, exten))
|
|
res = 0;
|
|
return res;
|
|
}
|
|
|
|
static int loopback_canmatch(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
|
|
{
|
|
LOOPBACK_COMMON;
|
|
res = ast_canmatch_extension(chan, newcontext, newexten, newpriority, callerid);
|
|
if (newpattern && !ast_extension_match(newpattern, exten))
|
|
res = 0;
|
|
return res;
|
|
}
|
|
|
|
static int loopback_exec(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
|
|
{
|
|
int found;
|
|
LOOPBACK_COMMON;
|
|
res = ast_spawn_extension(chan, newcontext, newexten, newpriority, callerid, &found, 0);
|
|
return res;
|
|
}
|
|
|
|
static int loopback_matchmore(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
|
|
{
|
|
LOOPBACK_COMMON;
|
|
res = ast_matchmore_extension(chan, newcontext, newexten, newpriority, callerid);
|
|
if (newpattern && !ast_extension_match(newpattern, exten))
|
|
res = 0;
|
|
return res;
|
|
}
|
|
|
|
static struct ast_switch loopback_switch =
|
|
{
|
|
name: "Loopback",
|
|
description: "Loopback Dialplan Switch",
|
|
exists: loopback_exists,
|
|
canmatch: loopback_canmatch,
|
|
exec: loopback_exec,
|
|
matchmore: loopback_matchmore,
|
|
};
|
|
|
|
static int unload_module(void)
|
|
{
|
|
ast_unregister_switch(&loopback_switch);
|
|
return 0;
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
if (ast_register_switch(&loopback_switch))
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Loopback Switch");
|