nua.c

this is simple sip stack.

/*
 * This file is part of the Sofia-SIP package
 *
 * Copyright (C) 2006 Nokia Corporation.
 *
 * Contact: Pekka Pessi <[e-mail]>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

/**@CFILE nua.c Sofia-SIP User Agent Library API Implementation.
 *
 * @author Pekka Pessi <[e-mail]>
 * @author Kai Vehmanen <[e-mail]>
 * @author Pasi Rinne-Rahkola
 *
 * @date Created: Wed Feb 14 18:32:58 2001 ppessi
 *
 */

#include "config.h"

#include <sofia-sip/su_tag.h>
#include <sofia-sip/su_tag_class.h>
#include <sofia-sip/su_tagarg.h>

#include <sofia-sip/su_tag_io.h>

#define SU_LOG (nua_log)
#include <sofia-sip/su_debug.h>

#define SU_ROOT_MAGIC_T   struct nua_s
#define SU_MSG_ARG_T      struct event_s
#define NUA_SAVED_EVENT_T su_msg_t *

#include <sofia-sip/sip_status.h>
#include <sofia-sip/sip_header.h>
#include <sofia-sip/nta.h>

#include "sofia-sip/nua.h"
#include "sofia-sip/nua_tag.h"
#include "nua_stack.h"

#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>

/* From AM_INIT/AC_INIT in our "config.h" */
char const nua_version[] = VERSION;

/**@var NUA_DEBUG
 *
 * Environment variable determining the debug log level for @b nua module.
 *
 * The NUA_DEBUG environment variable is used to determine the debug logging
 * level for @b nua module. The default level is 3.
 * 
 * @sa <su_debug.h>, nua_log, SOFIA_DEBUG
 */
extern char const NUA_DEBUG[];

#ifndef SU_DEBUG
#define SU_DEBUG 3
#endif

/**Debug log for @b nua module. 
 * 
 * The nua_log is the log object used by @b nua module. The level of
 * #nua_log is set using #NUA_DEBUG environment variable.
 */
su_log_t nua_log[] = { SU_LOG_INIT("nua", "NUA_DEBUG", SU_DEBUG) };

/**Create a NUA agent.
 *
 * This function creates a Sofia-SIP User Agent stack object (nua) and
 * initializes its parameters by given tagged values.
 *
 * @param root            Pointer to a root object
 * @param callback        Pointer to event callback function
 * @param magic           Pointer to callback context
 * @param tag,爒alue,