handle_udp.c

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/*
 * Copyright (C) 1999,2000,2001  Ross Combs ([e-mail])
 *
 * This program 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.
 *
 * This program 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.
 */
#include "common/setup_before.h"
#include "common/packet.h"
#include "common/udp_protocol.h"
#include "common/eventlog.h"
#include "connection.h"
#include "common/queue.h"
#include "common/bn_type.h"
#include "common/addr.h"
#include "udptest_send.h"
#include "handle_udp.h"
#include "common/setup_after.h"


extern int handle_udp_packet(int usock, unsigned int src_addr, unsigned short src_port, t_packet const * const packet)
{
    if (!packet)
    {
        eventlog(eventlog_level_error,__FUNCTION__,"[%d] got NULL packet",usock);
        return -1;
    }
    if (packet_get_class(packet)!=packet_class_udp)
    {
        eventlog(eventlog_level_error,__FUNCTION__,"[%d] got bad packet (class %d)",usock,(int)packet_get_class(packet));
        return -1;
    }
    
    switch (packet_get_type(packet))
    {
    case SERVER_UDPTEST: /* we might get these if a client is running on the same machine as us */
	if (packet_get_size(packet)<sizeof(t_server_udptest))
	{
	    eventlog(eventlog_level_error,__FUNCTION__,"[%d] got bad UDPTEST packet (expected %u bytes, got %u)",usock,sizeof(t_server_udptest),packet_get_size(packet));
	    return -1;
	}
	eventlog(eventlog_level_debug,__FUNCTION__,"[%d] got UDPTEST packet from %s (myself?)",usock,addr_num_to_addr_str(src_addr,src_port));
	return 0;
	
    case CLIENT_UDPPING:
	if (packet_get_size(packet)<sizeof(t_client_udpping))
	{
	    eventlog(eventlog_level_error,__FUNCTION__,"[%d] got bad UDPPING packet (expected %u bytes, got %u)",usock,sizeof(t_client_udpping),packet_get_size(packet));
	    return -1;
	}
	eventlog(eventlog_level_debug,__FUNCTION__,"[%d] got udpping unknown1=%u",usock,bn_int_get(packet->u.client_udpping.unknown1));
	return 0;
	
    case CLIENT_SESSIONADDR1:
	if (packet_get_size(packet)<sizeof(t_client_sessionaddr1))
	{
	    eventlog(eventlog_level_error,__FUNCTION__,"[%d] got bad SESSIONADDR1 packet (expected %u bytes, got %u)",usock,sizeof(t_client_sessionaddr1),packet_get_size(packet));
	    return -1;
	}
	
	{
	    t_connection * c;
	    
	    if (!(c = connlist_find_connection_by_sessionkey(bn_int_get(packet->u.client_sessionaddr1.sessionkey))))
	    {
		eventlog(eventlog_level_error,__FUNCTION__,"[%d] address not set (no connection with session key 0x%08x)",usock,bn_int_get(packet->u.client_sessionaddr1.sessionkey));
		return -1;
	    }
	    
	    if (conn_get_game_addr(c)!=src_addr || conn_get_game_port(c)!=src_port)
		eventlog(eventlog_level_info,__FUNCTION__,"[%d][%d] SESSIONADDR1 set new UDP address to %s",conn_get_socket(c),usock,addr_num_to_addr_str(src_addr,src_port));
	    
	    conn_set_game_socket(c,usock);
	    conn_set_game_addr(c,src_addr);
	    conn_set_game_port(c,src_port);
	    
	    udptest_send(c);
	}
	return 0;
	
    case CLIENT_SESSIONADDR2:
	if (packet_get_size(packet)<sizeof(t_client_sessionaddr2))
	{
	    eventlog(eventlog_level_error,__FUNCTION__,"[%d] got bad SESSIONADDR2 packet (expected %u bytes, got %u)",usock,sizeof(t_client_sessionaddr2),packet_get_size(packet));
	    return -1;
	}
	
	{
	    t_connection * c;
	    
	    if (!(c = connlist_find_connection_by_sessionnum(bn_int_get(packet->u.client_sessionaddr2.sessionnum))))
	    {
		eventlog(eventlog_level_error,__FUNCTION__,"[%d] address not set (no connection with session number %u)",usock,bn_int_get(packet->u.client_sessionaddr2.sessionnum));
		return -1;
	    }
	    if (conn_get_sessionkey(c)!=bn_int_get(packet->u.client_sessionaddr2.sessionkey))
	    {
		eventlog(eventlog_level_error,__FUNCTION__,"[%d][%d] address not set (expected session key 0x%08x, got 0x%08x)",conn_get_socket(c),usock,conn_get_sessionkey(c),bn_int_get(packet->u.client_sessionaddr2.sessionkey));
		return -1;
	    }
	    
	    if (conn_get_game_addr(c)!=src_addr || conn_get_game_port(c)!=src_port)
		eventlog(eventlog_level_info,__FUNCTION__,"[%d][%d] SESSIONADDR2 set new UDP address to %s",conn_get_socket(c),usock,addr_num_to_addr_str(src_addr,src_port));
	    
	    conn_set_game_socket(c,usock);
	    conn_set_game_addr(c,src_addr);
	    conn_set_game_port(c,src_port);
	    
	    udptest_send(c);
	}
	return 0;

	case CLIENT_SEARCH_LAN_GAMES: //added by Spider
	{
	  eventlog(eventlog_level_debug,__FUNCTION__,"[%d] got SEARCH_LAN_GAMES packet from %s",usock,addr_num_to_addr_str(src_addr,src_port));
	  return 0;
	}
	
    default:
	eventlog(eventlog_level_error,__FUNCTION__,"[%d] got unknown udp packet type 0x%04x, len %u from %s",usock,(unsigned int)packet_get_type(packet),packet_get_size(packet),addr_num_to_addr_str(src_addr,src_port));
    }
    
    return 0;
}