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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2009, Digium, Inc.
*
* Joshua Colp <jcolp@digium.com>
* Andreas 'MacBrody' Brodmann <andreas.brodmann@gmail.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
*
* \author Joshua Colp <jcolp@digium.com>
* \author Andreas 'MacBrody' Broadmann <andreas.brodmann@gmail.com>
*
* \brief Multicast RTP Paging Channel
*
* \ingroup channel_drivers
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include <fcntl.h>
#include <sys/signal.h>
#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/sched.h"
#include "asterisk/io.h"
#include "asterisk/acl.h"
#include "asterisk/callerid.h"
#include "asterisk/file.h"
#include "asterisk/cli.h"
#include "asterisk/app.h"
#include "asterisk/rtp_engine.h"
#include "asterisk/causes.h"
static const char tdesc[] = "Multicast RTP Paging Channel Driver";
/* Forward declarations */
static struct ast_channel *multicast_rtp_request(const char *type, format_t format, const struct ast_channel *requestor, void *data, int *cause);
static int multicast_rtp_call(struct ast_channel *ast, char *dest, int timeout);
static int multicast_rtp_hangup(struct ast_channel *ast);
static struct ast_frame *multicast_rtp_read(struct ast_channel *ast);
static int multicast_rtp_write(struct ast_channel *ast, struct ast_frame *f);
/* Channel driver declaration */
static const struct ast_channel_tech multicast_rtp_tech = {
.type = "MulticastRTP",
.description = tdesc,
.capabilities = -1,
.requester = multicast_rtp_request,
.call = multicast_rtp_call,
.hangup = multicast_rtp_hangup,
.read = multicast_rtp_read,
.write = multicast_rtp_write,
};
/*! \brief Function called when we should read a frame from the channel */
static struct ast_frame *multicast_rtp_read(struct ast_channel *ast)
{
return &ast_null_frame;
}
/*! \brief Function called when we should write a frame to the channel */
static int multicast_rtp_write(struct ast_channel *ast, struct ast_frame *f)
{
struct ast_rtp_instance *instance = ast->tech_pvt;
return ast_rtp_instance_write(instance, f);
}
/*! \brief Function called when we should actually call the destination */
static int multicast_rtp_call(struct ast_channel *ast, char *dest, int timeout)
{
struct ast_rtp_instance *instance = ast->tech_pvt;
ast_queue_control(ast, AST_CONTROL_ANSWER);
return ast_rtp_instance_activate(instance);
}
/*! \brief Function called when we should hang the channel up */
static int multicast_rtp_hangup(struct ast_channel *ast)
{
struct ast_rtp_instance *instance = ast->tech_pvt;
ast_rtp_instance_destroy(instance);
ast->tech_pvt = NULL;
return 0;
}
/*! \brief Function called when we should prepare to call the destination */
static struct ast_channel *multicast_rtp_request(const char *type, format_t format, const struct ast_channel *requestor, void *data, int *cause)
{
char *tmp = ast_strdupa(data), *multicast_type = tmp, *destination, *control;
struct ast_rtp_instance *instance;
struct ast_sockaddr control_address;
struct ast_sockaddr destination_address;
struct ast_channel *chan;
format_t fmt = ast_best_codec(format);
/* If no type was given we can't do anything */
if (ast_strlen_zero(multicast_type)) {
goto failure;
}
if (!(destination = strchr(tmp, '/'))) {
goto failure;
}
*destination++ = '\0';
if ((control = strchr(destination, '/'))) {
*control++ = '\0';
if (!ast_sockaddr_parse(&control_address, control,
PARSE_PORT_REQUIRE)) {
goto failure;
}
}
if (!ast_sockaddr_parse(&destination_address, destination,
PARSE_PORT_REQUIRE)) {
goto failure;
}
if (!(instance = ast_rtp_instance_new("multicast", NULL, &control_address, multicast_type))) {
goto failure;
}
if (!(chan = ast_channel_alloc(1, AST_STATE_DOWN, "", "", "", "", "", requestor ? requestor->linkedid : "", 0, "MulticastRTP/%p", instance))) {
ast_rtp_instance_destroy(instance);
goto failure;
}
ast_rtp_instance_set_remote_address(instance, &destination_address);
chan->tech = &multicast_rtp_tech;
chan->nativeformats = fmt;
chan->writeformat = fmt;
chan->readformat = fmt;
chan->rawwriteformat = fmt;
chan->rawreadformat = fmt;
chan->tech_pvt = instance;
return chan;
failure:
*cause = AST_CAUSE_FAILURE;
return NULL;
}
/*! \brief Function called when our module is loaded */
static int load_module(void)
{
if (ast_channel_register(&multicast_rtp_tech)) {
ast_log(LOG_ERROR, "Unable to register channel class 'MulticastRTP'\n");
return AST_MODULE_LOAD_DECLINE;
}
return AST_MODULE_LOAD_SUCCESS;
}
/*! \brief Function called when our module is unloaded */
static int unload_module(void)
{
ast_channel_unregister(&multicast_rtp_tech);
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Multicast RTP Paging Channel",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_CHANNEL_DRIVER,
);
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