/* 
 *$Id: receive.c,v 1.50 2004/08/24 08:45:10 janakj Exp $
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * ser 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 this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * ---------
 * 2003-02-28 scratchpad compatibility abandoned (jiri)
 * 2003-01-29 transport-independent message zero-termination in
 *            receive_msg (jiri)
 * 2003-02-07 undoed jiri's zero term. changes (they break tcp) (andrei)
 * 2003-02-10 moved zero-term in the calling functions (udp_receive &
 *            tcp_read_req)
 * 2003-08-13 fixed exec_pre_cb returning 0 (backported from stable) (andrei)
 * 2004-02-06 added user preferences support - destroy_avps() (bogdan)
 * 2004-04-30 exec_pre_cb is called after basic sanity checks (at least one
 *            via present & parsed ok)  (andrei)
 * 2004-08-23 avp core changed - destroy_avp-> reset_avps (bogdan)
 */


#include <string.h>
#include <stdlib.h>
#include <sys/time.h>

#include "receive.h"
#include "globals.h"
#include "dprint.h"
#include "route.h"
#include "parser/msg_parser.h"
#include "forward.h"
#include "action.h"
#include "mem/mem.h"
#include "stats.h"
#include "ip_addr.h"
#include "script_cb.h"
#include "dset.h"
#include "usr_avp.h"


#include "tcp_server.h" /* for tcpconn_add_alias */


#ifdef DEBUG_DMALLOC
#include <mem/dmalloc.h>
#endif

unsigned int msg_no=0;
/* address preset vars */
str default_global_address={0,0};
str default_global_port={0,0};
str default_via_address={0,0};
str default_via_port={0,0};



/* WARNING: buf must be 0 terminated (buf[len]=0) or some things might 
 * break (e.g.: modules/textops)
 */
int receive_msg(char* buf, unsigned int len, struct receive_info* rcv_info) 
{
	struct sip_msg* msg;
	int ret;
#ifdef STATS
	int skipped = 1;
	struct timeval tvb, tve;	
	struct timezone tz;
	unsigned int diff;
#endif

	msg=pkg_malloc(sizeof(struct sip_msg));
	if (msg==0) {
		LOG(L_ERR, "ERROR: receive_msg: no mem for sip_msg\n");
		goto error00;
	}
	msg_no++;
	/* number of vias parsed -- good for diagnostic info in replies */
	via_cnt=0;

	memset(msg,0, sizeof(struct sip_msg)); /* init everything to 0 */
	/* fill in msg */
	msg->buf=buf;
	msg->len=len;
	/* zero termination (termination of orig message bellow not that
	   useful as most of the work is done with scratch-pad; -jiri  */
	/* buf[len]=0; */ /* WARNING: zero term removed! */
	msg->rcv=*rcv_info;
	msg->id=msg_no;
	msg->set_global_address=default_global_address;
	msg->set_global_port=default_global_port;
	
	if (parse_msg(buf,len, msg)!=0){
		LOG(L_ERR, "ERROR: receive_msg: parse_msg failed\n");
		goto error02;
	}
	DBG("After parse_msg...\n");


	/* ... clear branches from previous message */
	clear_branches();

	if (msg->first_line.type==SIP_REQUEST){
		/* sanity checks */
		if ((msg->via1==0) || (msg->via1->error!=PARSE_OK)){
			/* no via, send back error ? */
			LOG(L_ERR, "ERROR: receive_msg: no via found in request\n");
			goto error;
		}
		/* check if necessary to add receive?->moved to forward_req */
		/* check for the alias stuff */
#ifdef USE_TCP
		if (msg->via1->alias && tcp_accept_aliases && 
				(((rcv_info->proto==PROTO_TCP) && !tcp_disable)
#ifdef USE_TLS
					|| ((rcv_info->proto==PROTO_TLS) && !tls_disable)
#endif
				)
			){
			if (tcpconn_add_alias(rcv_info->proto_reserved1, msg->via1->port,
									rcv_info->proto)!=0){
				LOG(L_ERR, " ERROR: receive_msg: tcp alias failed\n");
				/* continue */
			}
		}
#endif

		DBG("preparing to run routing scripts...\n");
#ifdef  STATS
		gettimeofday( & tvb, &tz );
#endif
		/* execute pre-script callbacks, if any; -jiri */
		/* if some of the callbacks said not to continue with
		   script processing, don't do so
		   if we are here basic sanity checks are already done
		   (like presence of at least one via), so you can count
		   on via1 being parsed in a pre-script callback --andrei
		*/
		ret=exec_pre_cb(msg);
		if (ret<=0){
			if (ret<0) goto error;
			else goto end; /* drop the message -- no error -- andrei */
		}
		/* exec the routing script */
		if (run_actions(rlist[0], msg)<0) {
			LOG(L_WARN, "WARNING: receive_msg: "
					"error while trying script\n");
			goto error;
		}

#ifdef STATS
		gettimeofday( & tve, &tz );
		diff = (tve.tv_sec-tvb.tv_sec)*1000000+(tve.tv_usec-tvb.tv_usec);
		stats->processed_requests++;
		stats->acc_req_time += diff;
		DBG("successfully ran routing scripts...(%d usec)\n", diff);
		STATS_RX_REQUEST( msg->first_line.u.request.method_value );
#endif
	}else if (msg->first_line.type==SIP_REPLY){
		/* sanity checks */
		if ((msg->via1==0) || (msg->via1->error!=PARSE_OK)){
			/* no via, send back error ? */
			LOG(L_ERR, "ERROR: receive_msg: no via found in reply\n");
			goto error;
		}
#if 0
		if ((msg->via2==0) || (msg->via2->error!=PARSE_OK)){
			/* no second via => error? */
			LOG(L_ERR, "ERROR: receive_msg: no 2nd via found in reply\n");
			goto error;
		}
		/* check if via1 == us */
#endif

#ifdef STATS
		gettimeofday( & tvb, &tz );
		STATS_RX_RESPONSE ( msg->first_line.u.reply.statuscode / 100 );
#endif
		
		/* execute pre-script callbacks, if any; -jiri */
		/* if some of the callbacks said not to continue with
		   script processing, don't do so
		   if we are here basic sanity checks are already done
		   (like presence of at least one via), so you can count
		   on via1 being parsed in a pre-script callback --andrei
		*/
		ret=exec_pre_cb(msg);
		if (ret<=0){
			if (ret<0) goto error;
			else goto end; /* drop the message -- no error -- andrei */
		}

		/* send the msg */
		forward_reply(msg);

#ifdef STATS
		gettimeofday( & tve, &tz );
		diff = (tve.tv_sec-tvb.tv_sec)*1000000+(tve.tv_usec-tvb.tv_usec);
		stats->processed_responses++;
		stats->acc_res_time+=diff;
		DBG("successfully ran reply processing...(%d usec)\n", diff);
#endif
	}
end:
#ifdef STATS
	skipped = 0;
#endif
	/* execute post-script callbacks, if any; -jiri */
	exec_post_cb(msg);
	/* free possible loaded avps -bogdan */
	reset_avps();
	DBG("receive_msg: cleaning up\n");
	free_sip_msg(msg);
	pkg_free(msg);
#ifdef STATS
	if (skipped) STATS_RX_DROPS;
#endif
	return 0;
error:
	DBG("error:...\n");
	/* execute post-script callbacks, if any; -jiri */
	exec_post_cb(msg);
	/* free possible loaded avps -bogdan */
	reset_avps();
error02:
	free_sip_msg(msg);
	pkg_free(msg);
error00:
	STATS_RX_DROPS;
	return -1;
}

