CEL is the new system for logging channel events. This was inspired after facing many problems trying to represent what is possible to happen to a call in Asterisk using CDR records. For more information on CEL, see the built in HTML or PDF documentation generated from the files in doc/tex/. Many thanks to Steve Murphy (murf) and Brian Degenhardt (bmd) for their hard work developing this code. Also, thanks to Matt Nicholson (mnicholson) and Sean Bright (seanbright) for their assistance in the final push to get this code ready for Asterisk trunk. Review: https://reviewboard.asterisk.org/r/239/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@203638 65c4cc65-6c06-0410-ace0-fbb531ad65f3
205 lines
6.2 KiB
C
205 lines
6.2 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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* 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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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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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="true" argsep="&">
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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 then one enter them as
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Technology2/Resource2&Technology3/Resourse3&.....</para>
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</argument>
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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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</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 status code for the available 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, option_state=0, string_compare=0, option_all_avail=0;
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int status;
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char *info, tmp[512], trychan[512], *peers, *tech, *number, *rest, *cur;
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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_channel *tempchan;
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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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if (ast_strlen_zero(data)) {
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ast_log(LOG_WARNING, "ChanIsAvail requires an argument (DAHDI/1&DAHDI/2)\n");
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return -1;
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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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peers = args.reqchans;
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if (peers) {
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cur = peers;
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do {
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/* remember where to start next time */
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rest = strchr(cur, '&');
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if (rest) {
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*rest = 0;
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rest++;
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}
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tech = cur;
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number = strchr(tech, '/');
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if (!number) {
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ast_log(LOG_WARNING, "ChanIsAvail argument takes format ([technology]/[device])\n");
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return -1;
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}
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*number = '\0';
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number++;
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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",cur,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",cur,number);
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status = inuse = ast_device_state(trychan);
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}
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if ((inuse <= 1) && (tempchan = ast_request(tech, chan->nativeformats, chan, number, &status))) {
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ast_str_append(&tmp_availchan, 0, "%s%s", ast_str_strlen(tmp_availchan) ? "&" : "", tempchan->name);
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snprintf(tmp, sizeof(tmp), "%s/%s", tech, number);
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ast_str_append(&tmp_availorig, 0, "%s%s", ast_str_strlen(tmp_availorig) ? "&" : "", tmp);
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snprintf(tmp, sizeof(tmp), "%d", status);
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ast_str_append(&tmp_availstat, 0, "%s%s", ast_str_strlen(tmp_availstat) ? "&" : "", tmp);
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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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} else {
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snprintf(tmp, sizeof(tmp), "%d", status);
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ast_str_append(&tmp_availstat, 0, "%s%s", ast_str_strlen(tmp_availstat) ? "&" : "", tmp);
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}
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cur = rest;
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} while (cur);
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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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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_STANDARD(ASTERISK_GPL_KEY, "Check channel availability");
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