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