https://origsvn.digium.com/svn/asterisk/branches/1.8 ........ r301851 | bbryant | 2011-01-14 15:11:55 -0500 (Fri, 14 Jan 2011) | 6 lines Changing previous revisions 301845/301847 to use ast_sockaddr_setnull() instead of setting the field manually to avoid uninitialized data. Review: https://reviewboard.asterisk.org/r/1076/ ........ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@301858 65c4cc65-6c06-0410-ace0-fbb531ad65f3
194 lines
5.3 KiB
C
194 lines
5.3 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2009, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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* Andreas 'MacBrody' Brodmann <andreas.brodmann@gmail.com>
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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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* \author Joshua Colp <jcolp@digium.com>
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* \author Andreas 'MacBrody' Broadmann <andreas.brodmann@gmail.com>
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*
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* \brief Multicast RTP Paging Channel
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*
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* \ingroup channel_drivers
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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 <fcntl.h>
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#include <sys/signal.h>
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#include "asterisk/lock.h"
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#include "asterisk/channel.h"
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#include "asterisk/config.h"
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#include "asterisk/module.h"
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#include "asterisk/pbx.h"
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#include "asterisk/sched.h"
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#include "asterisk/io.h"
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#include "asterisk/acl.h"
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#include "asterisk/callerid.h"
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#include "asterisk/file.h"
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#include "asterisk/cli.h"
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#include "asterisk/app.h"
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#include "asterisk/rtp_engine.h"
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#include "asterisk/causes.h"
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static const char tdesc[] = "Multicast RTP Paging Channel Driver";
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/* Forward declarations */
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static struct ast_channel *multicast_rtp_request(const char *type, format_t format, const struct ast_channel *requestor, void *data, int *cause);
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static int multicast_rtp_call(struct ast_channel *ast, char *dest, int timeout);
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static int multicast_rtp_hangup(struct ast_channel *ast);
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static struct ast_frame *multicast_rtp_read(struct ast_channel *ast);
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static int multicast_rtp_write(struct ast_channel *ast, struct ast_frame *f);
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/* Channel driver declaration */
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static const struct ast_channel_tech multicast_rtp_tech = {
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.type = "MulticastRTP",
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.description = tdesc,
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.capabilities = -1,
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.requester = multicast_rtp_request,
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.call = multicast_rtp_call,
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.hangup = multicast_rtp_hangup,
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.read = multicast_rtp_read,
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.write = multicast_rtp_write,
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};
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/*! \brief Function called when we should read a frame from the channel */
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static struct ast_frame *multicast_rtp_read(struct ast_channel *ast)
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{
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return &ast_null_frame;
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}
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/*! \brief Function called when we should write a frame to the channel */
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static int multicast_rtp_write(struct ast_channel *ast, struct ast_frame *f)
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{
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struct ast_rtp_instance *instance = ast->tech_pvt;
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return ast_rtp_instance_write(instance, f);
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}
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/*! \brief Function called when we should actually call the destination */
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static int multicast_rtp_call(struct ast_channel *ast, char *dest, int timeout)
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{
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struct ast_rtp_instance *instance = ast->tech_pvt;
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ast_queue_control(ast, AST_CONTROL_ANSWER);
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return ast_rtp_instance_activate(instance);
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}
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/*! \brief Function called when we should hang the channel up */
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static int multicast_rtp_hangup(struct ast_channel *ast)
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{
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struct ast_rtp_instance *instance = ast->tech_pvt;
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ast_rtp_instance_destroy(instance);
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ast->tech_pvt = NULL;
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return 0;
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}
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/*! \brief Function called when we should prepare to call the destination */
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static struct ast_channel *multicast_rtp_request(const char *type, format_t format, const struct ast_channel *requestor, void *data, int *cause)
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{
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char *tmp = ast_strdupa(data), *multicast_type = tmp, *destination, *control;
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struct ast_rtp_instance *instance;
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struct ast_sockaddr control_address;
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struct ast_sockaddr destination_address;
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struct ast_channel *chan;
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format_t fmt = ast_best_codec(format);
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ast_sockaddr_setnull(&control_address);
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/* If no type was given we can't do anything */
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if (ast_strlen_zero(multicast_type)) {
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goto failure;
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}
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if (!(destination = strchr(tmp, '/'))) {
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goto failure;
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}
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*destination++ = '\0';
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if ((control = strchr(destination, '/'))) {
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*control++ = '\0';
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if (!ast_sockaddr_parse(&control_address, control,
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PARSE_PORT_REQUIRE)) {
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goto failure;
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}
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}
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if (!ast_sockaddr_parse(&destination_address, destination,
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PARSE_PORT_REQUIRE)) {
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goto failure;
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}
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if (!(instance = ast_rtp_instance_new("multicast", NULL, &control_address, multicast_type))) {
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goto failure;
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}
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if (!(chan = ast_channel_alloc(1, AST_STATE_DOWN, "", "", "", "", "", requestor ? requestor->linkedid : "", 0, "MulticastRTP/%p", instance))) {
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ast_rtp_instance_destroy(instance);
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goto failure;
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}
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ast_rtp_instance_set_remote_address(instance, &destination_address);
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chan->tech = &multicast_rtp_tech;
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chan->nativeformats = fmt;
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chan->writeformat = fmt;
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chan->readformat = fmt;
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chan->rawwriteformat = fmt;
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chan->rawreadformat = fmt;
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chan->tech_pvt = instance;
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return chan;
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failure:
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*cause = AST_CAUSE_FAILURE;
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return NULL;
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}
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/*! \brief Function called when our module is loaded */
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static int load_module(void)
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{
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if (ast_channel_register(&multicast_rtp_tech)) {
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ast_log(LOG_ERROR, "Unable to register channel class 'MulticastRTP'\n");
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return AST_MODULE_LOAD_DECLINE;
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}
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return AST_MODULE_LOAD_SUCCESS;
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}
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/*! \brief Function called when our module is unloaded */
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static int unload_module(void)
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{
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ast_channel_unregister(&multicast_rtp_tech);
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Multicast RTP Paging Channel",
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_CHANNEL_DRIVER,
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);
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