dhewm3/neo/sys/win32/win_net.cpp

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

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.

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

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

In addition, the Doom 3 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 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.

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

#include "sys/platform.h"
#include "framework/Common.h"

#include "sys/win32/win_local.h"

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

static WSADATA	winsockdata;
static bool	winsockInitialized = false;

idCVar net_ip( "net_ip", "localhost", CVAR_SYSTEM, "local IP address" );
idCVar net_port( "net_port", "0", CVAR_SYSTEM | CVAR_INTEGER, "local IP port number" );
idCVar net_forceLatency( "net_forceLatency", "0", CVAR_SYSTEM | CVAR_INTEGER, "milliseconds latency" );
idCVar net_forceDrop( "net_forceDrop", "0", CVAR_SYSTEM | CVAR_INTEGER, "percentage packet loss" );

static SOCKET	ip_socket;

typedef struct {
	unsigned long ip;
	unsigned long mask;
} net_interface;

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

//=============================================================================


/*
====================
NET_ErrorString
====================
*/
const char *NET_ErrorString( void ) {
	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 "WSWSAECONNABORTEDAEINTR";
	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, struct sockaddr *s ) {
	memset( s, 0, sizeof(*s) );

	if( a->type == NA_BROADCAST ) {
		((struct sockaddr_in *)s)->sin_family = AF_INET;
		((struct sockaddr_in *)s)->sin_addr.s_addr = INADDR_BROADCAST;
	}
	else if( a->type == NA_IP || a->type == NA_LOOPBACK ) {
		((struct sockaddr_in *)s)->sin_family = AF_INET;
		((struct sockaddr_in *)s)->sin_addr.s_addr = *(int *)&a->ip;
	}

	((struct sockaddr_in *)s)->sin_port = htons( (short)a->port );
}


/*
====================
Net_SockadrToNetadr
====================
*/
void Net_SockadrToNetadr( struct sockaddr *s, netadr_t *a ) {
	unsigned int ip;
	if (s->sa_family == AF_INET) {
		ip = ((struct sockaddr_in *)s)->sin_addr.s_addr;
		*(unsigned int *)&a->ip = ip;
		a->port = htons( ((struct sockaddr_in *)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, (int)strlen( 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, struct sockaddr *sadr, bool doDNSResolve ) {
	struct hostent	*h;
	char buf[256];
	int port;

	memset( sadr, 0, sizeof( *sadr ) );

	((struct sockaddr_in *)sadr)->sin_family = AF_INET;
	((struct sockaddr_in *)sadr)->sin_port = 0;

	if( s[0] >= '0' && s[0] <= '9' ) {
		unsigned long ret = inet_addr(s);
		if ( ret != INADDR_NONE ) {
			*(int *)&((struct sockaddr_in *)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 *)&((struct sockaddr_in *)sadr)->sin_addr = ret;
			((struct sockaddr_in *)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 ) ) {
			((struct sockaddr_in *)sadr)->sin_port = htons( port );
		}
		h = gethostbyname( buf );
		if ( h == 0 ) {
			return false;
		}
		*(int *)&((struct sockaddr_in *)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;
	struct sockaddr_in	address;
	unsigned long		_true = 1;
	int					i = 1;
	int					err;

	if( net_interface ) {
		common->DPrintf( "Opening IP socket: %s:%i\n", net_interface, port );
	} else {
		common->DPrintf( "Opening IP socket: localhost:%i\n", port );
	}

	if( ( newsocket = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP ) ) == INVALID_SOCKET ) {
		err = WSAGetLastError();
		if( err != WSAEAFNOSUPPORT ) {
			common->Printf( "WARNING: UDP_OpenSocket: socket: %s\n", NET_ErrorString() );
		}
		return 0;
	}

	// make it non-blocking
	if( ioctlsocket( newsocket, FIONBIO, &_true ) == SOCKET_ERROR ) {
		common->Printf( "WARNING: UDP_OpenSocket: ioctl FIONBIO: %s\n", NET_ErrorString() );
		return 0;
	}

	// make it broadcast capable
	if( setsockopt( newsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i) ) == SOCKET_ERROR ) {
		common->Printf( "WARNING: UDP_OpenSocket: setsockopt SO_BROADCAST: %s\n", NET_ErrorString() );
		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, (struct sockaddr *)&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 struct sockaddr *)&address, sizeof(address) ) == SOCKET_ERROR ) {
		common->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 idPort::InitForPort )
	if ( bound_to ) {
		int len = sizeof( address );
		getsockname( newsocket, (sockaddr *)&address, &len );
		Net_SockadrToNetadr( (sockaddr *)&address, bound_to );
	}

	return newsocket;
}

/*
==================
Net_WaitForUDPPacket
==================
*/
bool Net_WaitForUDPPacket( 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( netSocket, &set );

	tv.tv_sec = 0;
	tv.tv_usec = timeout * 1000;

	ret = select( netSocket + 1, &set, NULL, NULL, &tv );

	if ( ret == -1 ) {
		common->DPrintf( "Net_WaitForUPDPacket 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;
	struct sockaddr	from;
	int				fromlen;
	int				err;

	if( !netSocket ) {
		return false;
	}

	fromlen = sizeof(from);
	ret = recvfrom( netSocket, data, maxSize, 0, (struct 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() );
		OutputDebugString( buf );
		return false;
	}

	if ( netSocket == ip_socket ) {
		memset( ((struct sockaddr_in *)&from)->sin_zero, 0, 8 );
	}

	Net_SockadrToNetadr( &from, &net_from );

	if( ret == maxSize ) {
		char	buf[1024];
		sprintf( buf, "Net_GetUDPPacket: oversize packet from %s\n", Sys_NetAdrToString( net_from ) );
		OutputDebugString( 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;
	struct sockaddr	addr;

	if( !netSocket ) {
		return;
	}

	Net_NetadrToSockadr( &to, &addr );
	ret = sendto( netSocket, (const char *)data, length, 0, &addr, sizeof(addr) );
	if( ret == SOCKET_ERROR ) {
		int err = WSAGetLastError();

		// wouldblock is silent
		if( err == WSAEWOULDBLOCK ) {
			return;
		}

		// some PPP links do not allow broadcasts and return an error
		if( ( err == WSAEADDRNOTAVAIL ) && ( to.type == NA_BROADCAST ) ) {
			return;
		}

		char	buf[1024];
		sprintf( buf, "Net_SendUDPPacket: %s\n", NET_ErrorString() );
		OutputDebugString( buf );
	}
}

/*
====================
Sys_InitNetworking
====================
*/
void Sys_InitNetworking( void ) {
	int		r;

	r = WSAStartup( MAKEWORD( 1, 1 ), &winsockdata );
	if( r ) {
		common->Printf( "WARNING: Winsock initialization failed, returned %d\n", r );
		return;
	}

	winsockInitialized = true;
	common->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 ) {
		common->FatalError( "Sys_InitNetworking: Couldn't malloc( %u )", (unsigned int)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 ) {
			common->FatalError( "Sys_InitNetworking: Couldn't malloc( %ld )", ulOutBufLen );
		}
	}

	if( ( dwRetVal = GetAdaptersInfo( pAdapterInfo, &ulOutBufLen) ) != NO_ERROR ) {
		// happens if you have no network connection
		common->Printf( "Sys_InitNetworking: GetAdaptersInfo failed (%ld).\n", dwRetVal );
	} else {
		pAdapter = pAdapterInfo;
		while( pAdapter ) {
			common->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 ) {
					common->Printf( "%s NULL netmask - skipped\n", pIPAddrString->IpAddress.String );
					pIPAddrString = pIPAddrString->Next;
					continue;
				}
				common->Printf( "%s/%s\n", pIPAddrString->IpAddress.String, pIPAddrString->IpMask.String );
				netint[num_interfaces].ip = ip_a;
				netint[num_interfaces].mask = ip_m;
				num_interfaces++;
				if( num_interfaces >= MAX_INTERFACES ) {
					common->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 ) {
		common->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( void ) {
	if ( !winsockInitialized ) {
		return;
	}
	WSACleanup();
	winsockInitialized = false;
}

/*
=============
Sys_StringToNetAdr
=============
*/
bool Sys_StringToNetAdr( const char *s, netadr_t *a, bool doDNSResolve ) {
	struct sockaddr 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 ID_NOLANADDRESS
	common->Printf( "Sys_IsLANAddress: ID_NOLANADDRESS\n" );
	return false;
#endif
	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 ) {
		return true;
	}

	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;
	}

	common->Printf( "Sys_CompareNetAdrBase: bad address type\n" );
	return false;
}

//=============================================================================


#define MAX_UDP_MSG_SIZE	1400

typedef struct udpMsg_s {
	byte				data[MAX_UDP_MSG_SIZE];
	netadr_t			address;
	int					size;
	unsigned int		time;
	struct udpMsg_s *	next;
} udpMsg_t;

class idUDPLag {
public:
						idUDPLag( void );
						~idUDPLag( void );

	udpMsg_t *			sendFirst;
	udpMsg_t *			sendLast;
	udpMsg_t *			recieveFirst;
	udpMsg_t *			recieveLast;
	idBlockAlloc<udpMsg_t, 64> udpMsgAllocator;
};

idUDPLag::idUDPLag( void ) {
	sendFirst = sendLast = recieveFirst = recieveLast = NULL;
}

idUDPLag::~idUDPLag( void ) {
	udpMsgAllocator.Shutdown();
}

idUDPLag *udpPorts[65536];

/*
==================
idPort::idPort
==================
*/
idPort::idPort() {
	netSocket = 0;
	memset( &bound_to, 0, sizeof( bound_to ) );
}

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

/*
==================
InitForPort
==================
*/
bool idPort::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;
	}

	udpPorts[ bound_to.port ] = new idUDPLag;

	return true;
}

/*
==================
idPort::Close
==================
*/
void idPort::Close() {
	if ( netSocket ) {
		if ( udpPorts[ bound_to.port ] ) {
			delete udpPorts[ bound_to.port ];
			udpPorts[ bound_to.port ] = NULL;
		}
		closesocket( netSocket );
		netSocket = 0;
		memset( &bound_to, 0, sizeof( bound_to ) );
	}
}

/*
==================
idPort::GetPacket
==================
*/
bool idPort::GetPacket( netadr_t &from, void *data, int &size, int maxSize ) {
	udpMsg_t *msg;
	bool ret;

	while( 1 ) {

		ret = Net_GetUDPPacket( netSocket, from, (char *)data, size, maxSize );
		if ( !ret ) {
			break;
		}

		if ( net_forceDrop.GetInteger() > 0 ) {
			if ( rand() < net_forceDrop.GetInteger() * RAND_MAX / 100 ) {
				continue;
			}
		}

		packetsRead++;
		bytesRead += size;

		if ( net_forceLatency.GetInteger() > 0 ) {

			assert( size <= MAX_UDP_MSG_SIZE );
			msg = udpPorts[ bound_to.port ]->udpMsgAllocator.Alloc();
			memcpy( msg->data, data, size );
			msg->size = size;
			msg->address = from;
			msg->time = Sys_Milliseconds();
			msg->next = NULL;
			if ( udpPorts[ bound_to.port ]->recieveLast ) {
				udpPorts[ bound_to.port ]->recieveLast->next = msg;
			} else {
				udpPorts[ bound_to.port ]->recieveFirst = msg;
			}
			udpPorts[ bound_to.port ]->recieveLast = msg;
		} else {
			break;
		}
	}

	if ( net_forceLatency.GetInteger() > 0 || ( udpPorts[ bound_to.port] && udpPorts[ bound_to.port ]->recieveFirst ) ) {

		msg = udpPorts[ bound_to.port ]->recieveFirst;
		if ( msg && msg->time <= Sys_Milliseconds() - net_forceLatency.GetInteger() ) {
			memcpy( data, msg->data, msg->size );
			size = msg->size;
			from = msg->address;
			udpPorts[ bound_to.port ]->recieveFirst = udpPorts[ bound_to.port ]->recieveFirst->next;
			if ( !udpPorts[ bound_to.port ]->recieveFirst ) {
				udpPorts[ bound_to.port ]->recieveLast = NULL;
			}
			udpPorts[ bound_to.port ]->udpMsgAllocator.Free( msg );
			return true;
		}
		return false;

	} else {
		return ret;
	}
}

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

	Net_WaitForUDPPacket( netSocket, timeout );

	if ( GetPacket( from, data, size, maxSize ) ) {
		return true;
	}

	return false;
}

/*
==================
idPort::SendPacket
==================
*/
void idPort::SendPacket( const netadr_t to, const void *data, int size ) {
	udpMsg_t *msg;

	if ( to.type == NA_BAD ) {
		common->Warning( "idPort::SendPacket: bad address type NA_BAD - ignored" );
		return;
	}

	packetsWritten++;
	bytesWritten += size;

	if ( net_forceDrop.GetInteger() > 0 ) {
		if ( rand() < net_forceDrop.GetInteger() * RAND_MAX / 100 ) {
			return;
		}
	}

	if ( net_forceLatency.GetInteger() > 0 || ( udpPorts[ bound_to.port ] && udpPorts[ bound_to.port ]->sendFirst ) ) {

		assert( size <= MAX_UDP_MSG_SIZE );
		msg = udpPorts[ bound_to.port ]->udpMsgAllocator.Alloc();
		memcpy( msg->data, data, size );
		msg->size = size;
		msg->address = to;
		msg->time = Sys_Milliseconds();
		msg->next = NULL;
		if ( udpPorts[ bound_to.port ]->sendLast ) {
			udpPorts[ bound_to.port ]->sendLast->next = msg;
		} else {
			udpPorts[ bound_to.port ]->sendFirst = msg;
		}
		udpPorts[ bound_to.port ]->sendLast = msg;

		for ( msg = udpPorts[ bound_to.port ]->sendFirst; msg && msg->time <= Sys_Milliseconds() - net_forceLatency.GetInteger(); msg = udpPorts[ bound_to.port ]->sendFirst ) {
			Net_SendUDPPacket( netSocket, msg->size, msg->data, msg->address );
			udpPorts[ bound_to.port ]->sendFirst = udpPorts[ bound_to.port ]->sendFirst->next;
			if ( !udpPorts[ bound_to.port ]->sendFirst ) {
				udpPorts[ bound_to.port ]->sendLast = NULL;
			}
			udpPorts[ bound_to.port ]->udpMsgAllocator.Free( msg );
		}

	} else {
		Net_SendUDPPacket( netSocket, size, data, to );
	}
}


//=============================================================================

/*
==================
idTCP::idTCP
==================
*/
idTCP::idTCP() {
	fd = 0;
	memset( &address, 0, sizeof( address ) );
}

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

/*
==================
idTCP::Init
==================
*/
bool idTCP::Init( const char *host, short port ) {
	unsigned long	_true = 1;
	struct sockaddr sadr;

	if ( !Sys_StringToNetAdr( host, &address, true ) ) {
		common->Printf( "Couldn't resolve server name \"%s\"\n", host );
		return false;
	}
	address.type = NA_IP;
	if ( !address.port ) {
		address.port = port;
	}
	common->Printf( "\"%s\" resolved to %i.%i.%i.%i:%i\n", host,
					address.ip[0], address.ip[1], address.ip[2], address.ip[3], address.port );
	Net_NetadrToSockadr( &address, &sadr );

	if ( fd ) {
		common->Warning( "idTCP::Init: already initialized?" );
	}

	if ( ( fd = socket( AF_INET, SOCK_STREAM, 0 ) ) == INVALID_SOCKET ) {
		fd = 0;
		common->Printf( "ERROR: idTCP::Init: socket: %s\n", NET_ErrorString() );
		return false;
	}

	if ( connect( fd, &sadr, sizeof(sadr)) == SOCKET_ERROR ) {
		common->Printf( "ERROR: idTCP::Init: connect: %s\n", NET_ErrorString() );
		closesocket( fd );
		fd = 0;
		return false;
	}

	// make it non-blocking
	if( ioctlsocket( fd, FIONBIO, &_true ) == SOCKET_ERROR ) {
		common->Printf( "ERROR: idTCP::Init: ioctl FIONBIO: %s\n", NET_ErrorString() );
		closesocket( fd );
		fd = 0;
		return false;
	}

	common->DPrintf( "Opened TCP connection\n" );
	return true;
}

/*
==================
idTCP::Close
==================
*/
void idTCP::Close() {
	if ( fd ) {
		closesocket( fd );
	}
	fd = 0;
}

/*
==================
idTCP::Read
==================
*/
int idTCP::Read( void *data, int size ) {
	int nbytes;

	if ( !fd ) {
		common->Printf("idTCP::Read: not initialized\n");
		return -1;
	}

	if ( ( nbytes = recv( fd, (char *)data, size, 0 ) ) == SOCKET_ERROR ) {
		if ( WSAGetLastError() == WSAEWOULDBLOCK ) {
			return 0;
		}
		common->Printf( "ERROR: idTCP::Read: %s\n", NET_ErrorString() );
		Close();
		return -1;
	}

	// a successful read of 0 bytes indicates remote has closed the connection
	if ( nbytes == 0 ) {
		common->DPrintf( "idTCP::Read: read 0 bytes - assume connection closed\n" );
		return -1;
	}

	return nbytes;
}

/*
==================
idTCP::Write
==================
*/
int idTCP::Write( void *data, int size ) {
	int nbytes;

	if ( !fd ) {
		common->Printf("idTCP::Write: not initialized\n");
		return -1;
	}

	if ( ( nbytes = send( fd, (char *)data, size, 0 ) ) == SOCKET_ERROR ) {
		common->Printf( "ERROR: idTCP::Write: %s\n", NET_ErrorString() );
		Close();
		return -1;
	}

	return nbytes;
}