doom3-bfg/neo/sys/win32/win_net.cpp

/*
===========================================================================

Doom 3 BFG Edition GPL Source Code
Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.

This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").

Doom 3 BFG Edition Source Code 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 3 of the License, or
(at your option) any later version.

Doom 3 BFG Edition Source Code 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 Doom 3 BFG Edition Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/
#pragma hdrstop
#include "../../idlib/precompiled.h"

/*
================================================================================================
Contains the NetworkSystem implementation specific to Win32.
================================================================================================
*/

#include <iptypes.h>
#include <iphlpapi.h>

static WSADATA	winsockdata;
static bool	winsockInitialized = false;
static bool usingSocks = false;

//lint -e569	ioctl macros trigger this

// force these libs to be included, so users of idLib don't need to add them to every project
#pragma comment(lib, "iphlpapi.lib" )
#pragma comment(lib, "wsock32.lib" )


/*
================================================================================================

	Network CVars

================================================================================================
*/

idCVar net_socksServer( "net_socksServer", "", CVAR_ARCHIVE, "" );
idCVar net_socksPort( "net_socksPort", "1080", CVAR_ARCHIVE | CVAR_INTEGER, "" );
idCVar net_socksUsername( "net_socksUsername", "", CVAR_ARCHIVE, "" );
idCVar net_socksPassword( "net_socksPassword", "", CVAR_ARCHIVE, "" );

idCVar net_ip( "net_ip", "localhost", 0, "local IP address" );

static struct sockaddr_in	socksRelayAddr;

static SOCKET	ip_socket;
static SOCKET	socks_socket;
static char		socksBuf[4096];

typedef struct
{
	unsigned long ip;
	unsigned long mask;
	char addr[16];
} net_interface;

#define 		MAX_INTERFACES	32
int				num_interfaces = 0;
net_interface	netint[MAX_INTERFACES];

/*
================================================================================================

	Free Functions

================================================================================================
*/

/*
========================
NET_ErrorString
========================
*/
const char* NET_ErrorString()
{
	int		code;
	
	code = WSAGetLastError();
	switch( code )
	{
		case WSAEINTR:
			return "WSAEINTR";
		case WSAEBADF:
			return "WSAEBADF";
		case WSAEACCES:
			return "WSAEACCES";
		case WSAEDISCON:
			return "WSAEDISCON";
		case WSAEFAULT:
			return "WSAEFAULT";
		case WSAEINVAL:
			return "WSAEINVAL";
		case WSAEMFILE:
			return "WSAEMFILE";
		case WSAEWOULDBLOCK:
			return "WSAEWOULDBLOCK";
		case WSAEINPROGRESS:
			return "WSAEINPROGRESS";
		case WSAEALREADY:
			return "WSAEALREADY";
		case WSAENOTSOCK:
			return "WSAENOTSOCK";
		case WSAEDESTADDRREQ:
			return "WSAEDESTADDRREQ";
		case WSAEMSGSIZE:
			return "WSAEMSGSIZE";
		case WSAEPROTOTYPE:
			return "WSAEPROTOTYPE";
		case WSAENOPROTOOPT:
			return "WSAENOPROTOOPT";
		case WSAEPROTONOSUPPORT:
			return "WSAEPROTONOSUPPORT";
		case WSAESOCKTNOSUPPORT:
			return "WSAESOCKTNOSUPPORT";
		case WSAEOPNOTSUPP:
			return "WSAEOPNOTSUPP";
		case WSAEPFNOSUPPORT:
			return "WSAEPFNOSUPPORT";
		case WSAEAFNOSUPPORT:
			return "WSAEAFNOSUPPORT";
		case WSAEADDRINUSE:
			return "WSAEADDRINUSE";
		case WSAEADDRNOTAVAIL:
			return "WSAEADDRNOTAVAIL";
		case WSAENETDOWN:
			return "WSAENETDOWN";
		case WSAENETUNREACH:
			return "WSAENETUNREACH";
		case WSAENETRESET:
			return "WSAENETRESET";
		case WSAECONNABORTED:
			return "WSAECONNABORTED";
		case WSAECONNRESET:
			return "WSAECONNRESET";
		case WSAENOBUFS:
			return "WSAENOBUFS";
		case WSAEISCONN:
			return "WSAEISCONN";
		case WSAENOTCONN:
			return "WSAENOTCONN";
		case WSAESHUTDOWN:
			return "WSAESHUTDOWN";
		case WSAETOOMANYREFS:
			return "WSAETOOMANYREFS";
		case WSAETIMEDOUT:
			return "WSAETIMEDOUT";
		case WSAECONNREFUSED:
			return "WSAECONNREFUSED";
		case WSAELOOP:
			return "WSAELOOP";
		case WSAENAMETOOLONG:
			return "WSAENAMETOOLONG";
		case WSAEHOSTDOWN:
			return "WSAEHOSTDOWN";
		case WSASYSNOTREADY:
			return "WSASYSNOTREADY";
		case WSAVERNOTSUPPORTED:
			return "WSAVERNOTSUPPORTED";
		case WSANOTINITIALISED:
			return "WSANOTINITIALISED";
		case WSAHOST_NOT_FOUND:
			return "WSAHOST_NOT_FOUND";
		case WSATRY_AGAIN:
			return "WSATRY_AGAIN";
		case WSANO_RECOVERY:
			return "WSANO_RECOVERY";
		case WSANO_DATA:
			return "WSANO_DATA";
		default:
			return "NO ERROR";
	}
}

/*
========================
Net_NetadrToSockadr
========================
*/
void Net_NetadrToSockadr( const netadr_t* a, sockaddr_in* s )
{
	memset( s, 0, sizeof( *s ) );
	
	if( a->type == NA_BROADCAST )
	{
		s->sin_family = AF_INET;
		s->sin_addr.s_addr = INADDR_BROADCAST;
	}
	else if( a->type == NA_IP || a->type == NA_LOOPBACK )
	{
		s->sin_family = AF_INET;
		s->sin_addr.s_addr = *( int* )a->ip;
	}
	
	s->sin_port = htons( ( short )a->port );
}

/*
========================
Net_SockadrToNetadr
========================
*/
void Net_SockadrToNetadr( sockaddr_in* s, netadr_t* a )
{
	unsigned int ip;
	if( s->sin_family == AF_INET )
	{
		ip = s->sin_addr.s_addr;
		*( unsigned int* )a->ip = ip;
		a->port = htons( s->sin_port );
		// we store in network order, that loopback test is host order..
		ip = ntohl( ip );
		if( ip == INADDR_LOOPBACK )
		{
			a->type = NA_LOOPBACK;
		}
		else
		{
			a->type = NA_IP;
		}
	}
}

/*
========================
Net_ExtractPort
========================
*/
static bool Net_ExtractPort( const char* src, char* buf, int bufsize, int* port )
{
	char* p;
	strncpy( buf, src, bufsize );
	p = buf;
	p += Min( bufsize - 1, idStr::Length( src ) );
	*p = '\0';
	p = strchr( buf, ':' );
	if( !p )
	{
		return false;
	}
	*p = '\0';
	*port = strtol( p + 1, NULL, 10 );
	if( errno == ERANGE )
	{
		return false;
	}
	return true;
}

/*
========================
Net_StringToSockaddr
========================
*/
static bool Net_StringToSockaddr( const char* s, sockaddr_in* sadr, bool doDNSResolve )
{
	struct hostent*	h;
	char buf[256];
	int port;
	
	memset( sadr, 0, sizeof( *sadr ) );
	
	sadr->sin_family = AF_INET;
	sadr->sin_port = 0;
	
	if( s[0] >= '0' && s[0] <= '9' )
	{
		unsigned long ret = inet_addr( s );
		if( ret != INADDR_NONE )
		{
			*( int* )&sadr->sin_addr = ret;
		}
		else
		{
			// check for port
			if( !Net_ExtractPort( s, buf, sizeof( buf ), &port ) )
			{
				return false;
			}
			ret = inet_addr( buf );
			if( ret == INADDR_NONE )
			{
				return false;
			}
			*( int* )&sadr->sin_addr = ret;
			sadr->sin_port = htons( port );
		}
	}
	else if( doDNSResolve )
	{
		// try to remove the port first, otherwise the DNS gets confused into multiple timeouts
		// failed or not failed, buf is expected to contain the appropriate host to resolve
		if( Net_ExtractPort( s, buf, sizeof( buf ), &port ) )
		{
			sadr->sin_port = htons( port );
		}
		h = gethostbyname( buf );
		if( h == 0 )
		{
			return false;
		}
		*( int* )&sadr->sin_addr = *( int* )h->h_addr_list[0];
	}
	
	return true;
}

/*
========================
NET_IPSocket
========================
*/
int NET_IPSocket( const char* net_interface, int port, netadr_t* bound_to )
{
	SOCKET				newsocket;
	sockaddr_in			address;
	unsigned long		_true = 1;
	int					i = 1;
	int					err;
	
	if( port != PORT_ANY )
	{
		if( net_interface )
		{
			idLib::Printf( "Opening IP socket: %s:%i\n", net_interface, port );
		}
		else
		{
			idLib::Printf( "Opening IP socket: localhost:%i\n", port );
		}
	}
	
	if( ( newsocket = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP ) ) == INVALID_SOCKET )
	{
		err = WSAGetLastError();
		if( err != WSAEAFNOSUPPORT )
		{
			idLib::Printf( "WARNING: UDP_OpenSocket: socket: %s\n", NET_ErrorString() );
		}
		return 0;
	}
	
	// make it non-blocking
	if( ioctlsocket( newsocket, FIONBIO, &_true ) == SOCKET_ERROR )
	{
		idLib::Printf( "WARNING: UDP_OpenSocket: ioctl FIONBIO: %s\n", NET_ErrorString() );
		closesocket( newsocket );
		return 0;
	}
	
	// make it broadcast capable
	if( setsockopt( newsocket, SOL_SOCKET, SO_BROADCAST, ( char* )&i, sizeof( i ) ) == SOCKET_ERROR )
	{
		idLib::Printf( "WARNING: UDP_OpenSocket: setsockopt SO_BROADCAST: %s\n", NET_ErrorString() );
		closesocket( newsocket );
		return 0;
	}
	
	if( !net_interface || !net_interface[0] || !idStr::Icmp( net_interface, "localhost" ) )
	{
		address.sin_addr.s_addr = INADDR_ANY;
	}
	else
	{
		Net_StringToSockaddr( net_interface, &address, true );
	}
	
	if( port == PORT_ANY )
	{
		address.sin_port = 0;
	}
	else
	{
		address.sin_port = htons( ( short )port );
	}
	
	address.sin_family = AF_INET;
	
	if( bind( newsocket, ( const sockaddr* )&address, sizeof( address ) ) == SOCKET_ERROR )
	{
		idLib::Printf( "WARNING: UDP_OpenSocket: bind: %s\n", NET_ErrorString() );
		closesocket( newsocket );
		return 0;
	}
	
	// if the port was PORT_ANY, we need to query again to know the real port we got bound to
	// ( this used to be in idUDP::InitForPort )
	if( bound_to )
	{
		int len = sizeof( address );
		getsockname( newsocket, ( sockaddr* )&address, &len );
		Net_SockadrToNetadr( &address, bound_to );
	}
	
	return newsocket;
}

/*
========================
NET_OpenSocks
========================
*/
void NET_OpenSocks( int port )
{
	sockaddr_in			address;
	struct hostent*		h;
	int					len;
	bool				rfc1929;
	unsigned char		buf[64];
	
	usingSocks = false;
	
	idLib::Printf( "Opening connection to SOCKS server.\n" );
	
	if( ( socks_socket = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ) ) == INVALID_SOCKET )
	{
		idLib::Printf( "WARNING: NET_OpenSocks: socket: %s\n", NET_ErrorString() );
		return;
	}
	
	h = gethostbyname( net_socksServer.GetString() );
	if( h == NULL )
	{
		idLib::Printf( "WARNING: NET_OpenSocks: gethostbyname: %s\n", NET_ErrorString() );
		return;
	}
	if( h->h_addrtype != AF_INET )
	{
		idLib::Printf( "WARNING: NET_OpenSocks: gethostbyname: address type was not AF_INET\n" );
		return;
	}
	address.sin_family = AF_INET;
	address.sin_addr.s_addr = *( int* )h->h_addr_list[0];
	address.sin_port = htons( ( short )net_socksPort.GetInteger() );
	
	if( connect( socks_socket, ( sockaddr* )&address, sizeof( address ) ) == SOCKET_ERROR )
	{
		idLib::Printf( "NET_OpenSocks: connect: %s\n", NET_ErrorString() );
		return;
	}
	
	// send socks authentication handshake
	if( *net_socksUsername.GetString() || *net_socksPassword.GetString() )
	{
		rfc1929 = true;
	}
	else
	{
		rfc1929 = false;
	}
	
	buf[0] = 5;		// SOCKS version
	// method count
	if( rfc1929 )
	{
		buf[1] = 2;
		len = 4;
	}
	else
	{
		buf[1] = 1;
		len = 3;
	}
	buf[2] = 0;		// method #1 - method id #00: no authentication
	if( rfc1929 )
	{
		buf[2] = 2;		// method #2 - method id #02: username/password
	}
	if( send( socks_socket, ( const char* )buf, len, 0 ) == SOCKET_ERROR )
	{
		idLib::Printf( "NET_OpenSocks: send: %s\n", NET_ErrorString() );
		return;
	}
	
	// get the response
	len = recv( socks_socket, ( char* )buf, 64, 0 );
	if( len == SOCKET_ERROR )
	{
		idLib::Printf( "NET_OpenSocks: recv: %s\n", NET_ErrorString() );
		return;
	}
	if( len != 2 || buf[0] != 5 )
	{
		idLib::Printf( "NET_OpenSocks: bad response\n" );
		return;
	}
	switch( buf[1] )
	{
		case 0:	// no authentication
			break;
		case 2: // username/password authentication
			break;
		default:
			idLib::Printf( "NET_OpenSocks: request denied\n" );
			return;
	}
	
	// do username/password authentication if needed
	if( buf[1] == 2 )
	{
		int		ulen;
		int		plen;
		
		// build the request
		ulen = idStr::Length( net_socksUsername.GetString() );
		plen = idStr::Length( net_socksPassword.GetString() );
		
		buf[0] = 1;		// username/password authentication version
		buf[1] = ulen;
		if( ulen )
		{
			memcpy( &buf[2], net_socksUsername.GetString(), ulen );
		}
		buf[2 + ulen] = plen;
		if( plen )
		{
			memcpy( &buf[3 + ulen], net_socksPassword.GetString(), plen );
		}
		
		// send it
		if( send( socks_socket, ( const char* )buf, 3 + ulen + plen, 0 ) == SOCKET_ERROR )
		{
			idLib::Printf( "NET_OpenSocks: send: %s\n", NET_ErrorString() );
			return;
		}
		
		// get the response
		len = recv( socks_socket, ( char* )buf, 64, 0 );
		if( len == SOCKET_ERROR )
		{
			idLib::Printf( "NET_OpenSocks: recv: %s\n", NET_ErrorString() );
			return;
		}
		if( len != 2 || buf[0] != 1 )
		{
			idLib::Printf( "NET_OpenSocks: bad response\n" );
			return;
		}
		if( buf[1] != 0 )
		{
			idLib::Printf( "NET_OpenSocks: authentication failed\n" );
			return;
		}
	}
	
	// send the UDP associate request
	buf[0] = 5;		// SOCKS version
	buf[1] = 3;		// command: UDP associate
	buf[2] = 0;		// reserved
	buf[3] = 1;		// address type: IPV4
	*( int* )&buf[4] = INADDR_ANY;
	*( short* )&buf[8] = htons( ( short )port );		// port
	if( send( socks_socket, ( const char* )buf, 10, 0 ) == SOCKET_ERROR )
	{
		idLib::Printf( "NET_OpenSocks: send: %s\n", NET_ErrorString() );
		return;
	}
	
	// get the response
	len = recv( socks_socket, ( char* )buf, 64, 0 );
	if( len == SOCKET_ERROR )
	{
		idLib::Printf( "NET_OpenSocks: recv: %s\n", NET_ErrorString() );
		return;
	}
	if( len < 2 || buf[0] != 5 )
	{
		idLib::Printf( "NET_OpenSocks: bad response\n" );
		return;
	}
	// check completion code
	if( buf[1] != 0 )
	{
		idLib::Printf( "NET_OpenSocks: request denied: %i\n", buf[1] );
		return;
	}
	if( buf[3] != 1 )
	{
		idLib::Printf( "NET_OpenSocks: relay address is not IPV4: %i\n", buf[3] );
		return;
	}
	socksRelayAddr.sin_family = AF_INET;
	socksRelayAddr.sin_addr.s_addr = *( int* )&buf[4];
	socksRelayAddr.sin_port = *( short* )&buf[8];
	memset( socksRelayAddr.sin_zero, 0, sizeof( socksRelayAddr.sin_zero ) );
	
	usingSocks = true;
}

/*
========================
Net_WaitForData
========================
*/
bool Net_WaitForData( int netSocket, int timeout )
{
	int					ret;
	fd_set				set;
	struct timeval		tv;
	
	if( !netSocket )
	{
		return false;
	}
	
	if( timeout < 0 )
	{
		return true;
	}
	
	FD_ZERO( &set );
	FD_SET( static_cast<unsigned int>( netSocket ), &set );
	
	tv.tv_sec = 0;
	tv.tv_usec = timeout * 1000;
	
	ret = select( netSocket + 1, &set, NULL, NULL, &tv );
	
	if( ret == -1 )
	{
		idLib::Printf( "Net_WaitForData select(): %s\n", strerror( errno ) );
		return false;
	}
	
	// timeout with no data
	if( ret == 0 )
	{
		return false;
	}
	
	return true;
}

/*
========================
Net_GetUDPPacket
========================
*/
bool Net_GetUDPPacket( int netSocket, netadr_t& net_from, char* data, int& size, int maxSize )
{
	int 			ret;
	sockaddr_in		from;
	int				fromlen;
	int				err;
	
	if( !netSocket )
	{
		return false;
	}
	
	fromlen = sizeof( from );
	ret = recvfrom( netSocket, data, maxSize, 0, ( sockaddr* )&from, &fromlen );
	if( ret == SOCKET_ERROR )
	{
		err = WSAGetLastError();
		
		if( err == WSAEWOULDBLOCK || err == WSAECONNRESET )
		{
			return false;
		}
		char	buf[1024];
		sprintf( buf, "Net_GetUDPPacket: %s\n", NET_ErrorString() );
		idLib::Printf( buf );
		return false;
	}
	
	if( static_cast<unsigned int>( netSocket ) == ip_socket )
	{
		memset( from.sin_zero, 0, sizeof( from.sin_zero ) );
	}
	
	if( usingSocks && static_cast<unsigned int>( netSocket ) == ip_socket && memcmp( &from, &socksRelayAddr, fromlen ) == 0 )
	{
		if( ret < 10 || data[0] != 0 || data[1] != 0 || data[2] != 0 || data[3] != 1 )
		{
			return false;
		}
		net_from.type = NA_IP;
		net_from.ip[0] = data[4];
		net_from.ip[1] = data[5];
		net_from.ip[2] = data[6];
		net_from.ip[3] = data[7];
		net_from.port = *( short* )&data[8];
		memmove( data, &data[10], ret - 10 );
	}
	else
	{
		Net_SockadrToNetadr( &from, &net_from );
	}
	
	if( ret > maxSize )
	{
		char	buf[1024];
		sprintf( buf, "Net_GetUDPPacket: oversize packet from %s\n", Sys_NetAdrToString( net_from ) );
		idLib::Printf( buf );
		return false;
	}
	
	size = ret;
	
	return true;
}

/*
========================
Net_SendUDPPacket
========================
*/
void Net_SendUDPPacket( int netSocket, int length, const void* data, const netadr_t to )
{
	int				ret;
	sockaddr_in		addr;
	
	if( !netSocket )
	{
		return;
	}
	
	Net_NetadrToSockadr( &to, &addr );
	
	if( usingSocks && to.type == NA_IP )
	{
		socksBuf[0] = 0;	// reserved
		socksBuf[1] = 0;
		socksBuf[2] = 0;	// fragment (not fragmented)
		socksBuf[3] = 1;	// address type: IPV4
		*( int* )&socksBuf[4] = addr.sin_addr.s_addr;
		*( short* )&socksBuf[8] = addr.sin_port;
		memcpy( &socksBuf[10], data, length );
		ret = sendto( netSocket, socksBuf, length + 10, 0, ( sockaddr* )&socksRelayAddr, sizeof( socksRelayAddr ) );
	}
	else
	{
		ret = sendto( netSocket, ( const char* )data, length, 0, ( sockaddr* )&addr, sizeof( addr ) );
	}
	if( ret == SOCKET_ERROR )
	{
		int err = WSAGetLastError();
		
		// some PPP links do not allow broadcasts and return an error
		if( ( err == WSAEADDRNOTAVAIL ) && ( to.type == NA_BROADCAST ) )
		{
			return;
		}
		
		// NOTE: WSAEWOULDBLOCK used to be silently ignored,
		// but that means the packet will be dropped so I don't feel it's a good thing to ignore
		idLib::Printf( "UDP sendto error - packet dropped: %s\n", NET_ErrorString() );
	}
}

/*
========================
Sys_InitNetworking
========================
*/
void Sys_InitNetworking()
{
	int		r;
	
	if( winsockInitialized )
	{
		return;
	}
	r = WSAStartup( MAKEWORD( 1, 1 ), &winsockdata );
	if( r )
	{
		idLib::Printf( "WARNING: Winsock initialization failed, returned %d\n", r );
		return;
	}
	
	winsockInitialized = true;
	idLib::Printf( "Winsock Initialized\n" );
	
	PIP_ADAPTER_INFO pAdapterInfo;
	PIP_ADAPTER_INFO pAdapter = NULL;
	DWORD dwRetVal = 0;
	PIP_ADDR_STRING pIPAddrString;
	ULONG ulOutBufLen;
	bool foundloopback;
	
	num_interfaces = 0;
	foundloopback = false;
	
	pAdapterInfo = ( IP_ADAPTER_INFO* )malloc( sizeof( IP_ADAPTER_INFO ) );
	if( !pAdapterInfo )
	{
		idLib::FatalError( "Sys_InitNetworking: Couldn't malloc( %d )", sizeof( IP_ADAPTER_INFO ) );
	}
	ulOutBufLen = sizeof( IP_ADAPTER_INFO );
	
	// Make an initial call to GetAdaptersInfo to get
	// the necessary size into the ulOutBufLen variable
	if( GetAdaptersInfo( pAdapterInfo, &ulOutBufLen ) == ERROR_BUFFER_OVERFLOW )
	{
		free( pAdapterInfo );
		pAdapterInfo = ( IP_ADAPTER_INFO* )malloc( ulOutBufLen );
		if( !pAdapterInfo )
		{
			idLib::FatalError( "Sys_InitNetworking: Couldn't malloc( %ld )", ulOutBufLen );
		}
	}
	
	if( ( dwRetVal = GetAdaptersInfo( pAdapterInfo, &ulOutBufLen ) ) != NO_ERROR )
	{
		// happens if you have no network connection
		idLib::Printf( "Sys_InitNetworking: GetAdaptersInfo failed (%ld).\n", dwRetVal );
	}
	else
	{
		pAdapter = pAdapterInfo;
		while( pAdapter )
		{
			idLib::Printf( "Found interface: %s %s - ", pAdapter->AdapterName, pAdapter->Description );
			pIPAddrString = &pAdapter->IpAddressList;
			while( pIPAddrString )
			{
				unsigned long ip_a, ip_m;
				if( !idStr::Icmp( "127.0.0.1", pIPAddrString->IpAddress.String ) )
				{
					foundloopback = true;
				}
				ip_a = ntohl( inet_addr( pIPAddrString->IpAddress.String ) );
				ip_m = ntohl( inet_addr( pIPAddrString->IpMask.String ) );
				//skip null netmasks
				if( !ip_m )
				{
					idLib::Printf( "%s NULL netmask - skipped\n", pIPAddrString->IpAddress.String );
					pIPAddrString = pIPAddrString->Next;
					continue;
				}
				idLib::Printf( "%s/%s\n", pIPAddrString->IpAddress.String, pIPAddrString->IpMask.String );
				netint[num_interfaces].ip = ip_a;
				netint[num_interfaces].mask = ip_m;
				idStr::Copynz( netint[num_interfaces].addr, pIPAddrString->IpAddress.String, sizeof( netint[num_interfaces].addr ) );
				num_interfaces++;
				if( num_interfaces >= MAX_INTERFACES )
				{
					idLib::Printf( "Sys_InitNetworking: MAX_INTERFACES(%d) hit.\n", MAX_INTERFACES );
					free( pAdapterInfo );
					return;
				}
				pIPAddrString = pIPAddrString->Next;
			}
			pAdapter = pAdapter->Next;
		}
	}
	// for some retarded reason, win32 doesn't count loopback as an adapter...
	if( !foundloopback && num_interfaces < MAX_INTERFACES )
	{
		idLib::Printf( "Sys_InitNetworking: adding loopback interface\n" );
		netint[num_interfaces].ip = ntohl( inet_addr( "127.0.0.1" ) );
		netint[num_interfaces].mask = ntohl( inet_addr( "255.0.0.0" ) );
		num_interfaces++;
	}
	free( pAdapterInfo );
}

/*
========================
Sys_ShutdownNetworking
========================
*/
void Sys_ShutdownNetworking()
{
	if( !winsockInitialized )
	{
		return;
	}
	WSACleanup();
	winsockInitialized = false;
}

/*
========================
Sys_StringToNetAdr
========================
*/
bool Sys_StringToNetAdr( const char* s, netadr_t* a, bool doDNSResolve )
{
	sockaddr_in sadr;
	
	if( !Net_StringToSockaddr( s, &sadr, doDNSResolve ) )
	{
		return false;
	}
	
	Net_SockadrToNetadr( &sadr, a );
	return true;
}

/*
========================
Sys_NetAdrToString
========================
*/
const char* Sys_NetAdrToString( const netadr_t a )
{
	static int index = 0;
	static char buf[ 4 ][ 64 ];	// flip/flop
	char* s;
	
	s = buf[index];
	index = ( index + 1 ) & 3;
	
	if( a.type == NA_LOOPBACK )
	{
		if( a.port )
		{
			idStr::snPrintf( s, 64, "localhost:%i", a.port );
		}
		else
		{
			idStr::snPrintf( s, 64, "localhost" );
		}
	}
	else if( a.type == NA_IP )
	{
		idStr::snPrintf( s, 64, "%i.%i.%i.%i:%i", a.ip[0], a.ip[1], a.ip[2], a.ip[3], a.port );
	}
	return s;
}

/*
========================
Sys_IsLANAddress
========================
*/
bool Sys_IsLANAddress( const netadr_t adr )
{
	if( adr.type == NA_LOOPBACK )
	{
		return true;
	}
	
	if( adr.type != NA_IP )
	{
		return false;
	}
	
	if( num_interfaces )
	{
		int i;
		unsigned long* p_ip;
		unsigned long ip;
		p_ip = ( unsigned long* )&adr.ip[0];
		ip = ntohl( *p_ip );
		
		for( i = 0; i < num_interfaces; i++ )
		{
			if( ( netint[i].ip & netint[i].mask ) == ( ip & netint[i].mask ) )
			{
				return true;
			}
		}
	}
	return false;
}

/*
========================
Sys_CompareNetAdrBase

Compares without the port.
========================
*/
bool Sys_CompareNetAdrBase( const netadr_t a, const netadr_t b )
{
	if( a.type != b.type )
	{
		return false;
	}
	
	if( a.type == NA_LOOPBACK )
	{
		if( a.port == b.port )
		{
			return true;
		}
		
		return false;
	}
	
	if( a.type == NA_IP )
	{
		if( a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3] )
		{
			return true;
		}
		return false;
	}
	
	idLib::Printf( "Sys_CompareNetAdrBase: bad address type\n" );
	return false;
}

/*
========================
Sys_GetLocalIPCount
========================
*/
int	Sys_GetLocalIPCount()
{
	return num_interfaces;
}

/*
========================
Sys_GetLocalIP
========================
*/
const char* Sys_GetLocalIP( int i )
{
	if( ( i < 0 ) || ( i >= num_interfaces ) )
	{
		return NULL;
	}
	return netint[i].addr;
}

/*
================================================================================================

	idUDP

================================================================================================
*/

/*
========================
idUDP::idUDP
========================
*/
idUDP::idUDP()
{
	netSocket = 0;
	memset( &bound_to, 0, sizeof( bound_to ) );
	silent = false;
	packetsRead = 0;
	bytesRead = 0;
	packetsWritten = 0;
	bytesWritten = 0;
}

/*
========================
idUDP::~idUDP
========================
*/
idUDP::~idUDP()
{
	Close();
}

/*
========================
idUDP::InitForPort
========================
*/
bool idUDP::InitForPort( int portNumber )
{
	netSocket = NET_IPSocket( net_ip.GetString(), portNumber, &bound_to );
	if( netSocket <= 0 )
	{
		netSocket = 0;
		memset( &bound_to, 0, sizeof( bound_to ) );
		return false;
	}
	
	return true;
}

/*
========================
idUDP::Close
========================
*/
void idUDP::Close()
{
	if( netSocket )
	{
		closesocket( netSocket );
		netSocket = 0;
		memset( &bound_to, 0, sizeof( bound_to ) );
	}
}

/*
========================
idUDP::GetPacket
========================
*/
bool idUDP::GetPacket( netadr_t& from, void* data, int& size, int maxSize )
{
	bool ret;
	
	while( 1 )
	{
	
		ret = Net_GetUDPPacket( netSocket, from, ( char* )data, size, maxSize );
		if( !ret )
		{
			break;
		}
		
		packetsRead++;
		bytesRead += size;
		
		break;
	}
	
	return ret;
}

/*
========================
idUDP::GetPacketBlocking
========================
*/
bool idUDP::GetPacketBlocking( netadr_t& from, void* data, int& size, int maxSize, int timeout )
{

	if( !Net_WaitForData( netSocket, timeout ) )
	{
		return false;
	}
	
	if( GetPacket( from, data, size, maxSize ) )
	{
		return true;
	}
	
	return false;
}

/*
========================
idUDP::SendPacket
========================
*/
void idUDP::SendPacket( const netadr_t to, const void* data, int size )
{
	if( to.type == NA_BAD )
	{
		idLib::Warning( "idUDP::SendPacket: bad address type NA_BAD - ignored" );
		return;
	}
	
	packetsWritten++;
	bytesWritten += size;
	
	if( silent )
	{
		return;
	}
	
	Net_SendUDPPacket( netSocket, size, data, to );
}