Fixes a crash due to a lack of proper reference on the nativeformats
object before passing it into ast_request(). Also found potentially
similar use case bugs in app_chanisavail.c, bridge.c, and bridge_basic.c
Fixes: #388
(cherry picked from commit 275f7911b5
)
239 lines
6.9 KiB
C
239 lines
6.9 KiB
C
/*
|
|
* Asterisk -- An open source telephony toolkit.
|
|
*
|
|
* Copyright (C) 1999 - 2005, Digium, Inc.
|
|
*
|
|
* Mark Spencer <markster@digium.com>
|
|
* James Golovich <james@gnuinter.net>
|
|
*
|
|
* 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 Check if Channel is Available
|
|
*
|
|
* \author Mark Spencer <markster@digium.com>
|
|
* \author James Golovich <james@gnuinter.net>
|
|
|
|
* \ingroup applications
|
|
*/
|
|
|
|
/*** MODULEINFO
|
|
<support_level>extended</support_level>
|
|
***/
|
|
|
|
#include "asterisk.h"
|
|
|
|
#include <sys/ioctl.h>
|
|
|
|
#include "asterisk/lock.h"
|
|
#include "asterisk/file.h"
|
|
#include "asterisk/channel.h"
|
|
#include "asterisk/pbx.h"
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/app.h"
|
|
#include "asterisk/devicestate.h"
|
|
|
|
static const char app[] = "ChanIsAvail";
|
|
|
|
/*** DOCUMENTATION
|
|
<application name="ChanIsAvail" language="en_US">
|
|
<synopsis>
|
|
Check channel availability
|
|
</synopsis>
|
|
<syntax>
|
|
<parameter name="Technology/Resource" required="false" argsep="&">
|
|
<argument name="Technology/Resource" required="true">
|
|
<para>Specification of the device(s) to check. These must be in the format of
|
|
<literal>Technology/Resource</literal>, where <replaceable>Technology</replaceable>
|
|
represents a particular channel driver, and <replaceable>Resource</replaceable>
|
|
represents a resource available to that particular channel driver.</para>
|
|
</argument>
|
|
<argument name="Technology2/Resource2" multiple="true">
|
|
<para>Optional extra devices to check</para>
|
|
<para>If you need more than one enter them as
|
|
Technology2/Resource2&Technology3/Resource3&.....</para>
|
|
</argument>
|
|
</parameter>
|
|
<parameter name="options" required="false">
|
|
<optionlist>
|
|
<option name="a">
|
|
<para>Check for all available channels, not only the first one</para>
|
|
</option>
|
|
<option name="s">
|
|
<para>Consider the channel unavailable if the channel is in use at all</para>
|
|
</option>
|
|
<option name="t" implies="s">
|
|
<para>Simply checks if specified channels exist in the channel list</para>
|
|
</option>
|
|
</optionlist>
|
|
</parameter>
|
|
</syntax>
|
|
<description>
|
|
<para>This application will check to see if any of the specified channels are available.</para>
|
|
<para>This application sets the following channel variables:</para>
|
|
<variablelist>
|
|
<variable name="AVAILCHAN">
|
|
<para>The name of the available channel, if one exists</para>
|
|
</variable>
|
|
<variable name="AVAILORIGCHAN">
|
|
<para>The canonical channel name that was used to create the channel</para>
|
|
</variable>
|
|
<variable name="AVAILSTATUS">
|
|
<para>The device state for the device</para>
|
|
</variable>
|
|
<variable name="AVAILCAUSECODE">
|
|
<para>The cause code returned when requesting the channel</para>
|
|
</variable>
|
|
</variablelist>
|
|
</description>
|
|
</application>
|
|
***/
|
|
|
|
static int chanavail_exec(struct ast_channel *chan, const char *data)
|
|
{
|
|
int inuse = -1;
|
|
int option_state = 0;
|
|
int string_compare = 0;
|
|
int option_all_avail = 0;
|
|
int status;
|
|
char *info;
|
|
char trychan[512];
|
|
char *rest;
|
|
char *tech;
|
|
char *number;
|
|
struct ast_str *tmp_availchan = ast_str_alloca(2048);
|
|
struct ast_str *tmp_availorig = ast_str_alloca(2048);
|
|
struct ast_str *tmp_availstat = ast_str_alloca(2048);
|
|
struct ast_str *tmp_availcause = ast_str_alloca(2048);
|
|
struct ast_channel *tempchan;
|
|
struct ast_custom_function *cdr_prop_func = ast_custom_function_find("CDR_PROP");
|
|
struct ast_format_cap *caps = NULL;
|
|
AST_DECLARE_APP_ARGS(args,
|
|
AST_APP_ARG(reqchans);
|
|
AST_APP_ARG(options);
|
|
);
|
|
|
|
info = ast_strdupa(data ?: "");
|
|
|
|
AST_STANDARD_APP_ARGS(args, info);
|
|
|
|
ao2_lock(chan);
|
|
caps = ao2_bump(ast_channel_nativeformats(chan));
|
|
ao2_unlock(chan);
|
|
|
|
if (args.options) {
|
|
if (strchr(args.options, 'a')) {
|
|
option_all_avail = 1;
|
|
}
|
|
if (strchr(args.options, 's')) {
|
|
option_state = 1;
|
|
}
|
|
if (strchr(args.options, 't')) {
|
|
string_compare = 1;
|
|
}
|
|
}
|
|
|
|
rest = args.reqchans;
|
|
if (!rest) {
|
|
rest = "";
|
|
}
|
|
while ((tech = strsep(&rest, "&"))) {
|
|
tech = ast_strip(tech);
|
|
|
|
number = strchr(tech, '/');
|
|
if (!number) {
|
|
if (!ast_strlen_zero(tech)) {
|
|
ast_log(LOG_WARNING, "Invalid ChanIsAvail technology/resource argument: '%s'\n",
|
|
tech);
|
|
}
|
|
|
|
ast_str_append(&tmp_availstat, 0, "%s%d",
|
|
ast_str_strlen(tmp_availstat) ? "&" : "", AST_DEVICE_INVALID);
|
|
continue;
|
|
}
|
|
*number++ = '\0';
|
|
|
|
status = AST_DEVICE_UNKNOWN;
|
|
|
|
if (string_compare) {
|
|
/* ast_parse_device_state checks for "SIP/1234" as a channel name.
|
|
ast_device_state will ask the SIP driver for the channel state. */
|
|
|
|
snprintf(trychan, sizeof(trychan), "%s/%s", tech, number);
|
|
status = inuse = ast_parse_device_state(trychan);
|
|
} else if (option_state) {
|
|
/* If the pbx says in use then don't bother trying further.
|
|
This is to permit testing if someone's on a call, even if the
|
|
channel can permit more calls (ie callwaiting, sip calls, etc). */
|
|
|
|
snprintf(trychan, sizeof(trychan), "%s/%s", tech, number);
|
|
status = inuse = ast_device_state(trychan);
|
|
}
|
|
ast_str_append(&tmp_availstat, 0, "%s%d", ast_str_strlen(tmp_availstat) ? "&" : "", status);
|
|
|
|
if ((inuse <= (int) AST_DEVICE_NOT_INUSE)
|
|
&& (tempchan = ast_request(tech, caps, NULL, chan, number, &status))) {
|
|
|
|
ast_str_append(&tmp_availchan, 0, "%s%s",
|
|
ast_str_strlen(tmp_availchan) ? "&" : "", ast_channel_name(tempchan));
|
|
|
|
ast_str_append(&tmp_availorig, 0, "%s%s/%s",
|
|
ast_str_strlen(tmp_availorig) ? "&" : "", tech, number);
|
|
|
|
ast_str_append(&tmp_availcause, 0, "%s%d",
|
|
ast_str_strlen(tmp_availcause) ? "&" : "", status);
|
|
|
|
/* Disable CDR for this temporary channel. */
|
|
if (cdr_prop_func) {
|
|
ast_func_write(tempchan, "CDR_PROP(disable)", "1");
|
|
}
|
|
|
|
ast_hangup(tempchan);
|
|
tempchan = NULL;
|
|
|
|
if (!option_all_avail) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
ao2_cleanup(caps);
|
|
|
|
pbx_builtin_setvar_helper(chan, "AVAILCHAN", ast_str_buffer(tmp_availchan));
|
|
/* Store the originally used channel too */
|
|
pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", ast_str_buffer(tmp_availorig));
|
|
pbx_builtin_setvar_helper(chan, "AVAILSTATUS", ast_str_buffer(tmp_availstat));
|
|
pbx_builtin_setvar_helper(chan, "AVAILCAUSECODE", ast_str_buffer(tmp_availcause));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
return ast_unregister_application(app);
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
return ast_register_application_xml(app, chanavail_exec) ?
|
|
AST_MODULE_LOAD_DECLINE : AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Check channel availability",
|
|
.support_level = AST_MODULE_SUPPORT_EXTENDED,
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
.optional_modules = "func_cdr"
|
|
);
|