forward.h
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 /*
  *  $Id$
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  *
  * 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
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  */
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 /*
  * History:
  * -------
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  *  2001-??-?? created by andrei
  *  ????-??-?? lots of changes by a lot of people
  *  2003-02-11 added inline msg_send (andrei)
  *  2003-04-07 changed all ports to host byte order (andrei)
  *  2003-04-12  FORCE_RPORT_T added (andrei)
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  *  2003-04-15  added tcp_disable support (andrei)
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  */
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 #ifndef forward_h
 #define forward_h
 
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 #include "globals.h"
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 #include "parser/msg_parser.h"
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 #include "route.h"
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 #include "proxy.h"
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 #include "ip_addr.h"
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 #include "stats.h"
 #include "udp_server.h"
 #ifdef USE_TCP
 #include "tcp_server.h"
 #endif
 
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 struct socket_info* get_send_socket(union sockaddr_union* su, int proto);
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 struct socket_info* get_out_socket(union sockaddr_union* to, int proto);
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 int check_self(str* host, unsigned short port);
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 int forward_request( struct sip_msg* msg,  struct proxy_l* p, int proto);
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 int update_sock_struct_from_via( union sockaddr_union* to,
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 								 struct sip_msg* msg,
 								 struct via_body* via );
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 /* use src_ip, port=src_port if rport, via port if via port, 5060 otherwise */
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 #define update_sock_struct_from_ip(  to, msg ) \
 	init_su((to), &(msg)->rcv.src_ip, \
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 			(((msg)->via1->rport)||((msg)->msg_flags&&FL_FORCE_RPORT))? \
 							(msg)->rcv.src_port: \
 							((msg)->via1->port)?(msg)->via1->port: SIP_PORT )
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 int forward_reply( struct sip_msg* msg);
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 /* params:
  *  send_sock= 0 if already known (e.g. for udp in some cases), non-0 otherwise
  *  proto=TCP|UDP
  *  to = destination,
  *  id - only used on tcp, it will force sending on connection "id" if id!=0 
  *       and the connection exists, else it will send to "to" 
  *       (usefull for sending replies on  the same connection as the request
  *       that generated them; use 0 if you don't want this)
  * returns: 0 if ok, -1 on error*/
 static inline int msg_send(	struct socket_info* send_sock, int proto,
 							union sockaddr_union* to, int id,
 							char* buf, int len)
 {
 	
 	if (proto==PROTO_UDP){
 		if (send_sock==0) send_sock=get_send_socket(to, proto);
 		if (send_sock==0){
 			LOG(L_ERR, "msg_send: ERROR: no sending socket found\n");
 			goto error;
 		}
 		if (udp_send(send_sock, buf, len, to)==-1){
 			STATS_TX_DROPS;
 			LOG(L_ERR, "msg_send: ERROR: udp_send failed\n");
 			goto error;
 		}
 	}
 #ifdef USE_TCP
 	else if (proto==PROTO_TCP){
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 		if (tcp_disable){
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 			STATS_TX_DROPS;
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 			LOG(L_WARN, "msg_send: WARNING: attempt to send on tcp and tcp"
 					" support is disabled\n");
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 			goto error;
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 		}else{
 			if (tcp_send(buf, len, to, id)<0){
 				STATS_TX_DROPS;
 				LOG(L_ERR, "msg_send: ERROR: tcp_send failed\n");
 				goto error;
 			}
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 		}
 	}
 #endif
 	else{
 			LOG(L_CRIT, "BUG: msg_send: unknown proto %d\n", proto);
 			goto error;
 	}
 	return 0;
 error:
 	return -1;
 }
 
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 #endif