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/*
* Asterisk -- A telephony toolkit for Linux.
*
* Check if Channel is Available
*
* Copyright (C) 2003, Digium
*
* Mark Spencer <markster@digium.com>
* James Golovich <james@gnuinter.net>
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*
*/
#include <asterisk/lock.h>
#include <asterisk/file.h>
#include <asterisk/logger.h>
#include <asterisk/channel.h>
#include <asterisk/pbx.h>
#include <asterisk/module.h>
#include <asterisk/app.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/ioctl.h>
static char *tdesc = "Check if channel is available";
static char *app = "ChanIsAvail";
static char *synopsis = "Check if channel is available";
static char *descrip =
" ChanIsAvail(Technology/resource[&Technology2/resource2...]): \n"
"Checks is any of the requested channels are available. If none\n"
"of the requested channels are available the new priority will be\n"
"n+101 (unless such a priority does not exist or on error, in which\n"
"case ChanIsAvail will return -1).\n"
"If any of the requested channels are available, the next priority will be n+1,\n"
"the channel variable ${AVAILCHAN} will be set to the name of the available channel\n"
"and the ChanIsAvail app will return 0.\n"
"${AVAILORIGCHAN} is the canonical channel name that was used to create the channel.\n"
"${AVAILSTATUS} is the status code for the channel.\n";
STANDARD_LOCAL_USER;
LOCAL_USER_DECL;
static int chanavail_exec(struct ast_channel *chan, void *data)
{
int res=-1;
struct localuser *u;
char info[512], tmp[512], *peers, *tech, *number, *rest, *cur;
struct ast_channel *tempchan;
if (!data) {
ast_log(LOG_WARNING, "ChanIsAvail requires an argument (Zap/1&Zap/2)\n");
return -1;
}
LOCAL_USER_ADD(u);
strncpy(info, (char *)data, sizeof(info)-1);
peers = info;
if (peers) {
cur = peers;
do {
/* remember where to start next time */
rest = strchr(cur, '&');
if (rest) {
*rest = 0;
rest++;
}
tech = cur;
number = strchr(tech, '/');
if (!number) {
ast_log(LOG_WARNING, "ChanIsAvail argument takes format ([technology]/[device])\n");
return -1;
}
*number = '\0';
number++;
if ((tempchan = ast_request(tech, chan->nativeformats, number))) {
pbx_builtin_setvar_helper(chan, "AVAILCHAN", tempchan->name);
/* Store the originally used channel too */
snprintf(tmp, sizeof(tmp), "%s/%s", tech, number);
pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", tmp);
ast_hangup(tempchan);
tempchan = NULL;
res = 1;
break;
}
cur = rest;
} while (cur);
}
if (res < 1) {
pbx_builtin_setvar_helper(chan, "AVAILCHAN", "");
pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", "");
if (ast_exists_extension(chan, chan->context, chan->exten, chan->priority + 101, chan->callerid))
chan->priority+=100;
else
return -1;
}
LOCAL_USER_REMOVE(u);
return 0;
}
int unload_module(void)
{
STANDARD_HANGUP_LOCALUSERS;
return ast_unregister_application(app);
}
int load_module(void)
{
return ast_register_application(app, chanavail_exec, synopsis, descrip);
}
char *description(void)
{
return tdesc;
}
int usecount(void)
{
int res;
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}
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