rtsp_valid_response_msg.c

linuxUNIX下跑的一套服务端程序

/* * 
 *  $Id: RTSP_valid_response_msg.c 133 2005-05-09 17:35:14Z federico $
 *  
 *  This file is part of Fenice
 *
 *  Fenice -- Open Media Server
 *
 *  Copyright (C) 2004 by
 *  	
 *	- Giampaolo Mancini	<[e-mail]>
 *	- Francesco Varano	<[e-mail]>
 *	- Marco Penno		<[e-mail]>
 *	- Federico Ridolfo	<[e-mail]>
 *	- Eugenio Menegatti 	<[e-mail]>
 *	- Stefano Cau
 *	- Giuliano Emma
 *	- Stefano Oldrini
 * 
 *  Fenice is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  Fenice 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Fenice; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *  
 * */

#include <stdio.h>
#include <string.h>

#include <fenice/rtsp.h>
#include <fenice/utils.h>
#include <fenice/fnc_log.h>

int RTSP_valid_response_msg(unsigned short *status, char *msg, RTSP_buffer * rtsp)
// This routine is from OMS.
{
	char ver[32], trash[15];
	unsigned int stat;
	unsigned int seq;
	int pcnt;		/* parameter count */

	*ver = *msg = '\0';
	/* assuming "stat" may not be zero (probably faulty) */
	stat = 0;

	pcnt = sscanf(rtsp->in_buffer, " %31s %u %s %s %u\n%255s ", ver, &stat, trash, trash, &seq, msg);

	/* check for a valid response token. */
	if (strncasecmp(ver, "RTSP/", 5))
		return (0);	/* not a response message */

	/* confirm that at least the version, status code and sequence are there. */
	if (pcnt < 3 || stat == 0)
		return (0);	/* not a response message */

	/*
	 * here is where code can be added to reject the message if the RTSP
	 * version is not compatible.
	 */

	/* check if the sequence number is valid in this response message. */
	if (rtsp->rtsp_cseq != seq + 1) {
		fnc_log(FNC_LOG_ERR,"Invalid sequence number returned in response.\n");
		return ERR_GENERIC;
	}

	*status = stat;
	return (1);
}