lilium-voyager/code/qcommon/net_ip.c

/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena 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 2 of the License,
or (at your option) any later version.

Quake III Arena 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 Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

#include "../qcommon/q_shared.h"
#include "../qcommon/qcommon.h"

#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#if WINVER < 0x501
#include <wspiapi.h>
#else
#include <ws2spi.h>
#endif

typedef int socklen_t;
typedef unsigned short sa_family_t;
#define EAGAIN				WSAEWOULDBLOCK
#define EADDRNOTAVAIL	WSAEADDRNOTAVAIL
#define EAFNOSUPPORT	WSAEAFNOSUPPORT
#define ECONNRESET		WSAECONNRESET
#define socketError		WSAGetLastError( )

static WSADATA	winsockdata;
static qboolean	winsockInitialized = qfalse;

#else

#if MAC_OS_X_VERSION_MIN_REQUIRED == 1020
	// needed for socklen_t on OSX 10.2
#	define _BSD_SOCKLEN_T_
#endif

#include <arpa/inet.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#ifndef __sun
#include <ifaddrs.h>
#endif

#ifdef __sun
#include <sys/filio.h>
#endif

typedef int SOCKET;
#define INVALID_SOCKET		-1
#define SOCKET_ERROR			-1
#define closesocket				close
#define ioctlsocket				ioctl
#define socketError				errno

#endif

static qboolean usingSocks = qfalse;
static int networkingEnabled = 0;

#define NET_ENABLEV4	0x01
#define NET_ENABLEV6	0x02
// if this flag is set, always attempt ipv6 connections instead of ipv4 if a v6 address is found.
#define NET_PRIOV6	0x04
static cvar_t	*net_enabled;

static cvar_t	*net_socksEnabled;
static cvar_t	*net_socksServer;
static cvar_t	*net_socksPort;
static cvar_t	*net_socksUsername;
static cvar_t	*net_socksPassword;

static cvar_t	*net_ip;
static cvar_t	*net_ip6;
static cvar_t	*net_port;
static cvar_t	*net_port6;

static struct sockaddr	socksRelayAddr;

static SOCKET	ip_socket = INVALID_SOCKET;
static SOCKET	ip6_socket = INVALID_SOCKET;
static SOCKET	socks_socket = INVALID_SOCKET;

#define	MAX_IPS		16
static	int		numIP;
static	int		numIP6;

static	byte	localIP[MAX_IPS][4];
static	byte	localIPmask[MAX_IPS][4];
static	byte	localIP6[MAX_IPS][16];
static	byte	localIP6mask[MAX_IPS][16];

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


/*
====================
NET_ErrorString
====================
*/
char *NET_ErrorString( void ) {
#ifdef _WIN32
	//FIXME: replace with FormatMessage?
	switch( socketError ) {
		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";
	}
#else
	return strerror (errno);
#endif
}

static void NetadrToSockadr( netadr_t *a, struct sockaddr *s ) {
	if( a->type == NA_BROADCAST ) {
		((struct sockaddr_in *)s)->sin_family = AF_INET;
		((struct sockaddr_in *)s)->sin_port = a->port;
		((struct sockaddr_in *)s)->sin_addr.s_addr = INADDR_BROADCAST;
	}
	else if( a->type == NA_IP ) {
		((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 = a->port;
	}
	else if( a->type == NA_IP6 ) {
		((struct sockaddr_in6 *)s)->sin6_family = AF_INET6;
		((struct sockaddr_in6 *)s)->sin6_addr = * ((struct in6_addr *) &a->ip6);
		((struct sockaddr_in6 *)s)->sin6_port = a->port;
	}
}


static void SockadrToNetadr( struct sockaddr *s, netadr_t *a ) {
	if (s->sa_family == AF_INET) {
		a->type = NA_IP;
		*(int *)&a->ip = ((struct sockaddr_in *)s)->sin_addr.s_addr;
		a->port = ((struct sockaddr_in *)s)->sin_port;
	}
	else if(s->sa_family == AF_INET6)
	{
		a->type = NA_IP6;
		memcpy(a->ip6, &((struct sockaddr_in6 *)s)->sin6_addr, sizeof(a->ip6));
		a->port = ((struct sockaddr_in6 *)s)->sin6_port;
	}
}


static struct addrinfo *SearchAddrInfo(struct addrinfo *hints, sa_family_t family)
{
	while(hints)
	{
		if(hints->ai_family == family)
			return hints;

		hints = hints->ai_next;
	}
	
	return NULL;
}

/*
=============
Sys_StringToSockaddr
=============
*/
static qboolean Sys_StringToSockaddr(const char *s, struct sockaddr *sadr, int sadr_len, sa_family_t family)
{
	struct addrinfo hints, *res = NULL, *search;
	int retval;
	
	memset(sadr, '\0', sizeof(*sadr));
	memset(&hints, '\0', sizeof(hints));
	
	hints.ai_family = family;
	
	retval = getaddrinfo(s, NULL, &hints, &res);

	if(!retval)
	{
		if(family == AF_UNSPEC)
		{
			// Decide here and now which protocol family to use
			if((net_enabled->integer & NET_ENABLEV6) && (net_enabled->integer & NET_PRIOV6))
				search = SearchAddrInfo(res, AF_INET6);
			else
				search = SearchAddrInfo(res, AF_INET);
			
			if(!search)
			{
				if((net_enabled->integer & NET_ENABLEV6) &&
				   (net_enabled->integer & NET_PRIOV6) &&
				   (net_enabled->integer & NET_ENABLEV4))
					search = SearchAddrInfo(res, AF_INET);
				else if(net_enabled->integer & NET_ENABLEV6)
					search = SearchAddrInfo(res, AF_INET6);
			}
		}
		else
			search = SearchAddrInfo(res, family);

		if(search)
		{
			if(res->ai_addrlen > sadr_len)
				res->ai_addrlen = sadr_len;
				
			memcpy(sadr, res->ai_addr, res->ai_addrlen);
			freeaddrinfo(res);
			
			return qtrue;
		}
		else
			Com_Printf("Sys_StringToSockaddr: Error resolving %s: No address of required type found.\n", s);
	}
	else
		Com_Printf("Sys_StringToSockaddr: Error resolving %s: %s\n", s, gai_strerror(retval));
	
	if(res)
		freeaddrinfo(res);
	
	return qfalse;
}

/*
=============
Sys_SockaddrToString
=============
*/
static void Sys_SockaddrToString(char *dest, int destlen, struct sockaddr *input, int inputlen)
{
	getnameinfo(input, inputlen, dest, destlen, NULL, 0, NI_NUMERICHOST);
}

/*
=============
Sys_StringToAdr
=============
*/
qboolean Sys_StringToAdr( const char *s, netadr_t *a, netadrtype_t family ) {
	struct sockaddr_storage sadr;
	sa_family_t fam;
	
	switch(family)
	{
		case NA_IP:
			fam = AF_INET;
		break;
		case NA_IP6:
			fam = AF_INET6;
		break;
		default:
			fam = AF_UNSPEC;
		break;
	}
	if( !Sys_StringToSockaddr(s, (struct sockaddr *) &sadr, sizeof(sadr), fam ) ) {
		return qfalse;
	}
	
	SockadrToNetadr( (struct sockaddr *) &sadr, a );
	return qtrue;
}

/*
===================
NET_CompareBaseAdr

Compares without the port
===================
*/
qboolean	NET_CompareBaseAdr (netadr_t a, netadr_t b)
{
	if (a.type != b.type)
		return qfalse;

	if (a.type == NA_LOOPBACK)
		return qtrue;

	if (a.type == NA_IP)
	{
		if(!memcmp(a.ip, b.ip, sizeof(a.ip)))
			return qtrue;
		
		return qfalse;
	}
	
	if (a.type == NA_IP6)
	{
		if(!memcmp(a.ip6, b.ip6, sizeof(a.ip6)))
				  return qtrue;
		
		return qfalse;
	}

	Com_Printf ("NET_CompareBaseAdr: bad address type\n");
	return qfalse;
}

const char	*NET_AdrToString (netadr_t a)
{
	static	char	s[NET_ADDRSTRMAXLEN];

	if (a.type == NA_LOOPBACK) {
		Com_sprintf (s, sizeof(s), "loopback");
	} else if (a.type == NA_BOT) {
		Com_sprintf (s, sizeof(s), "bot");
	}
	else if (a.type == NA_IP || a.type == NA_IP6)
	{
		struct sockaddr_storage sadr;
	
		memset(&sadr, 0, sizeof(sadr));
		NetadrToSockadr(&a, (struct sockaddr *) &sadr);
		Sys_SockaddrToString(s, sizeof(s), (struct sockaddr *) &sadr, sizeof(sadr));
	}

	return s;
}

const char	*NET_AdrToStringwPort (netadr_t a)
{
	static	char	s[NET_ADDRSTRMAXLEN];

	if (a.type == NA_LOOPBACK) {
		Com_sprintf (s, sizeof(s), "loopback");
	} else if (a.type == NA_BOT) {
		Com_sprintf (s, sizeof(s), "bot");
	}
	else if (a.type == NA_IP || a.type == NA_IP6)
	{
		if(a.type == NA_IP)
			Com_sprintf(s, sizeof(s), "%s:%hu", NET_AdrToString(a), ntohs(a.port));
		else if(a.type == NA_IP6)
			Com_sprintf(s, sizeof(s), "[%s]:%hu", NET_AdrToString(a), ntohs(a.port));
	}

	return s;
}


qboolean	NET_CompareAdr (netadr_t a, netadr_t b)
{
	if(!NET_CompareBaseAdr(a, b))
		return qfalse;
	
	if (a.type == NA_IP || a.type == NA_IP6)
	{
		if (a.port == b.port)
			return qtrue;
	}
	else
		return qtrue;
		
	return qfalse;
}


qboolean	NET_IsLocalAddress( netadr_t adr ) {
	return adr.type == NA_LOOPBACK;
}

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

/*
==================
Sys_GetPacket

Never called by the game logic, just the system event queing
==================
*/
#ifdef _DEBUG
int	recvfromCount;
#endif

qboolean Sys_GetPacket( netadr_t *net_from, msg_t *net_message ) {
	int 	ret;
	struct sockaddr_storage from;
	socklen_t	fromlen;
	int		err;

#ifdef _DEBUG
	recvfromCount++;		// performance check
#endif
	
	if(ip_socket != INVALID_SOCKET)
	{
		fromlen = sizeof(from);
		ret = recvfrom( ip_socket, net_message->data, net_message->maxsize, 0, (struct sockaddr *)&from, &fromlen );
		
		if (ret == SOCKET_ERROR)
		{
			err = socketError;

			if( err != EAGAIN && err != ECONNRESET )
				Com_Printf( "NET_GetPacket: %s\n", NET_ErrorString() );
		}
		else
		{

			memset( ((struct sockaddr_in *)&from)->sin_zero, 0, 8 );
		
			if ( usingSocks && memcmp( &from, &socksRelayAddr, fromlen ) == 0 ) {
				if ( ret < 10 || net_message->data[0] != 0 || net_message->data[1] != 0 || net_message->data[2] != 0 || net_message->data[3] != 1 ) {
					return qfalse;
				}
				net_from->type = NA_IP;
				net_from->ip[0] = net_message->data[4];
				net_from->ip[1] = net_message->data[5];
				net_from->ip[2] = net_message->data[6];
				net_from->ip[3] = net_message->data[7];
				net_from->port = *(short *)&net_message->data[8];
				net_message->readcount = 10;
			}
			else {
				SockadrToNetadr( (struct sockaddr *) &from, net_from );
				net_message->readcount = 0;
			}
		
			if( ret == net_message->maxsize ) {
				Com_Printf( "Oversize packet from %s\n", NET_AdrToString (*net_from) );
				return qfalse;
			}
			
			net_message->cursize = ret;
			return qtrue;
		}
	}
	
	if(ip6_socket != INVALID_SOCKET)
	{
		fromlen = sizeof(from);
		ret = recvfrom(ip6_socket, net_message->data, net_message->maxsize, 0, (struct sockaddr *)&from, &fromlen);
		
		if (ret == SOCKET_ERROR)
		{
			err = socketError;

			if( err != EAGAIN && err != ECONNRESET )
				Com_Printf( "NET_GetPacket: %s\n", NET_ErrorString() );
		}
		else
		{
			SockadrToNetadr((struct sockaddr *) &from, net_from);
			net_message->readcount = 0;
		
			if(ret == net_message->maxsize)
			{
				Com_Printf( "Oversize packet from %s\n", NET_AdrToString (*net_from) );
				return qfalse;
			}
			
			net_message->cursize = ret;
			return qtrue;
		}
	}
	
	return qfalse;
}

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

static char socksBuf[4096];

/*
==================
Sys_SendPacket
==================
*/
void Sys_SendPacket( int length, const void *data, netadr_t to ) {
	int				ret = SOCKET_ERROR;
	struct sockaddr_storage	addr;

	if( to.type != NA_BROADCAST && to.type != NA_IP && to.type != NA_IP6 ) {
		Com_Error( ERR_FATAL, "Sys_SendPacket: bad address type" );
		return;
	}

	if((ip_socket == INVALID_SOCKET && to.type == NA_IP) || (ip6_socket == INVALID_SOCKET && to.type == NA_IP6))
		return;

	memset(&addr, 0, sizeof(addr));
	NetadrToSockadr( &to, (struct sockaddr *) &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] = ((struct sockaddr_in *)&addr)->sin_addr.s_addr;
		*(short *)&socksBuf[8] = ((struct sockaddr_in *)&addr)->sin_port;
		memcpy( &socksBuf[10], data, length );
		ret = sendto( ip_socket, socksBuf, length+10, 0, &socksRelayAddr, sizeof(socksRelayAddr) );
	}
	else {
		if(addr.ss_family == AF_INET)
			ret = sendto( ip_socket, data, length, 0, (struct sockaddr *) &addr, sizeof(struct sockaddr_in) );
		else if(addr.ss_family == AF_INET6)
			ret = sendto( ip6_socket, data, length, 0, (struct sockaddr *) &addr, sizeof(struct sockaddr_in6) );
	}
	if( ret == SOCKET_ERROR ) {
		int err = socketError;

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

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

		Com_Printf( "NET_SendPacket: %s\n", NET_ErrorString() );
	}
}


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

/*
==================
Sys_IsLANAddress

LAN clients will have their rate var ignored
==================
*/
qboolean Sys_IsLANAddress( netadr_t adr ) {
	int		index, run;
	qboolean differed;

	if( adr.type == NA_LOOPBACK ) {
		return qtrue;
	}

	if( adr.type == NA_IP )
	{
		// RFC1918:
		// 10.0.0.0        -   10.255.255.255  (10/8 prefix)
		// 172.16.0.0      -   172.31.255.255  (172.16/12 prefix)
		// 192.168.0.0     -   192.168.255.255 (192.168/16 prefix)
		if(adr.ip[0] == 10)
			return qtrue;
		if(adr.ip[0] == 172 && (adr.ip[1]&0xf0) == 16)
			return qtrue;
		if(adr.ip[0] == 192 && adr.ip[1] == 168)
			return qtrue;

		if(adr.ip[0] == 127)
			return qtrue;

		for(index = 0; index < numIP; index++)
		{
			differed = qfalse;
			
			for(run = 0; run < sizeof(*localIP); run++)
			{
				if((localIP[index][run] & localIPmask[index][run]) != (adr.ip[run] & localIPmask[index][run]))
				{
					differed = qtrue;
					break;
				}
			}
			
			if(!differed)
				return qtrue;
		}
	}
	else if(adr.type == NA_IP6)
	{
		if(adr.ip6[0] == 0xfe && (adr.ip6[1] & 0xc0) == 0x80)
			return qtrue;
		if((adr.ip6[0] & 0xfe) == 0xfc)
			return qtrue;

		for(index = 0; index < numIP6; index++)
		{
			differed = qfalse;
			
			for(run = 0; run < sizeof(*localIP6); run++)
			{
				if((localIP6[index][run] & localIP6mask[index][run]) != (adr.ip6[run] & localIP6mask[index][run]))
				{
					differed = qtrue;
					break;
				}
			}
			
			if(!differed)
				return qtrue;
		}
	}
	
	return qfalse;
}

/*
==================
Sys_ShowIP
==================
*/
void Sys_ShowIP(void) {
	int i;
	char buf[NET_ADDRSTRMAXLEN];
	struct sockaddr_in sa;
	struct sockaddr_in6 sa6;

	for (i = 0; i < numIP; i++)
	{
		memset(&sa, 0, sizeof(sa));

		memcpy( &sa.sin_addr.s_addr, localIP[i], sizeof(sa.sin_addr.s_addr) );
		sa.sin_family = AF_INET;
		Sys_SockaddrToString(buf, sizeof(buf), (struct sockaddr *) &sa, sizeof(sa));
		Com_Printf( "IP: %s\n", buf);
	}
	for (i = 0; i < numIP6; i++)
	{
		memset(&sa6, 0, sizeof(sa6));

		memcpy( &sa6.sin6_addr, localIP6[i], sizeof(sa6.sin6_addr) );
		sa6.sin6_family = AF_INET6;
		Sys_SockaddrToString(buf, sizeof(buf), (struct sockaddr *) &sa6, sizeof(sa6));
		Com_Printf( "IP6: %s\n", buf);
	}
}


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


/*
====================
NET_IPSocket
====================
*/
int NET_IPSocket( char *net_interface, int port, int *err ) {
	SOCKET				newsocket;
	struct sockaddr_in	address;
	qboolean			_true = qtrue;
	int					i = 1;

	*err = 0;

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

	if( ( newsocket = socket( PF_INET, SOCK_DGRAM, IPPROTO_UDP ) ) == INVALID_SOCKET ) {
		*err = socketError;
		Com_Printf( "WARNING: NET_IPSocket: socket: %s\n", NET_ErrorString() );
		return newsocket;
	}
	// make it non-blocking
	if( ioctlsocket( newsocket, FIONBIO, (u_long *)&_true ) == SOCKET_ERROR ) {
		Com_Printf( "WARNING: NET_IPSocket: ioctl FIONBIO: %s\n", NET_ErrorString() );
		*err = socketError;
		closesocket(newsocket);
		return INVALID_SOCKET;
	}

	// make it broadcast capable
	if( setsockopt( newsocket, SOL_SOCKET, SO_BROADCAST, (char *) &i, sizeof(i) ) == SOCKET_ERROR ) {
		Com_Printf( "WARNING: NET_IPSocket: setsockopt SO_BROADCAST: %s\n", NET_ErrorString() );

		// it is not that bad if this one fails.
//		return newsocket;
	}

	if( !net_interface || !net_interface[0] || !Q_stricmp(net_interface, "localhost") ) {
		address.sin_family = AF_INET;
		address.sin_addr.s_addr = INADDR_ANY;
	}
	else
	{
		if(!Sys_StringToSockaddr( net_interface, (struct sockaddr *)&address, sizeof(address), AF_INET))
		{
			closesocket(newsocket);
			return INVALID_SOCKET;
		}
	}

	if( port == PORT_ANY ) {
		address.sin_port = 0;
	}
	else {
		address.sin_port = htons( (short)port );
	}

	if( bind( newsocket, (void *)&address, sizeof(address) ) == SOCKET_ERROR ) {
		Com_Printf( "WARNING: NET_IPSocket: bind: %s\n", NET_ErrorString() );
		*err = socketError;
		closesocket( newsocket );
		return INVALID_SOCKET;
	}

	return newsocket;
}

/*
====================
NET_IP6Socket
====================
*/
int NET_IP6Socket( char *net_interface, int port, int *err ) {
	SOCKET				newsocket;
	struct sockaddr_in6	address;
	qboolean			_true = qtrue;
	int					i = 1;

	*err = 0;

	if( net_interface ) {
		Com_Printf( "Opening IP6 socket: [%s]:%i\n", net_interface, port );
	}
	else {
		Com_Printf( "Opening IP6 socket: localhost:%i\n", port );
	}

	if( ( newsocket = socket( PF_INET6, SOCK_DGRAM, IPPROTO_UDP ) ) == INVALID_SOCKET ) {
		*err = socketError;
		Com_Printf( "WARNING: NET_IP6Socket: socket: %s\n", NET_ErrorString() );
		return newsocket;
	}

	// make it non-blocking
	if( ioctlsocket( newsocket, FIONBIO, (u_long *)&_true ) == SOCKET_ERROR ) {
		Com_Printf( "WARNING: NET_IP6Socket: ioctl FIONBIO: %s\n", NET_ErrorString() );
		*err = socketError;
		closesocket(newsocket);
		return INVALID_SOCKET;
	}

#ifdef IPV6_V6ONLY
	// ipv4 addresses should not be allowed to connect via this socket.
	if(setsockopt(newsocket, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &i, sizeof(i)) == SOCKET_ERROR)
	{
		// win32 systems don't seem to support this anyways.
		Com_DPrintf("WARNING: NET_IP6Socket: setsockopt IPV6_V6ONLY: %s\n", NET_ErrorString());
	}
#endif

	// make it broadcast capable
	if( setsockopt( newsocket, SOL_SOCKET, SO_BROADCAST, (char *) &i, sizeof(i) ) == SOCKET_ERROR ) {
		Com_Printf( "WARNING: NET_IP6Socket: setsockopt SO_BROADCAST: %s\n", NET_ErrorString() );
//		return newsocket;
	}

	if( !net_interface || !net_interface[0] || !Q_stricmp(net_interface, "localhost") ) {
		address.sin6_family = AF_INET6;
		address.sin6_addr = in6addr_any;
	}
	else
	{
		if(!Sys_StringToSockaddr( net_interface, (struct sockaddr *)&address, sizeof(address), AF_INET6))
		{
			closesocket(newsocket);
			return INVALID_SOCKET;
		}
	}

	if( port == PORT_ANY ) {
		address.sin6_port = 0;
	}
	else {
		address.sin6_port = htons( (short)port );
	}

	if( bind( newsocket, (void *)&address, sizeof(address) ) == SOCKET_ERROR ) {
		Com_Printf( "WARNING: NET_IP6Socket: bind: %s\n", NET_ErrorString() );
		*err = socketError;
		closesocket( newsocket );
		return INVALID_SOCKET;
	}

	return newsocket;
}


/*
====================
NET_OpenSocks
====================
*/
void NET_OpenSocks( int port ) {
	struct sockaddr_in	address;
	int					err;
	struct hostent		*h;
	int					len;
	qboolean			rfc1929;
	unsigned char		buf[64];

	usingSocks = qfalse;

	Com_Printf( "Opening connection to SOCKS server.\n" );

	if ( ( socks_socket = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ) ) == INVALID_SOCKET ) {
		err = socketError;
		Com_Printf( "WARNING: NET_OpenSocks: socket: %s\n", NET_ErrorString() );
		return;
	}

	h = gethostbyname( net_socksServer->string );
	if ( h == NULL ) {
		err = socketError;
		Com_Printf( "WARNING: NET_OpenSocks: gethostbyname: %s\n", NET_ErrorString() );
		return;
	}
	if ( h->h_addrtype != AF_INET ) {
		Com_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->integer );

	if ( connect( socks_socket, (struct sockaddr *)&address, sizeof( address ) ) == SOCKET_ERROR ) {
		err = socketError;
		Com_Printf( "NET_OpenSocks: connect: %s\n", NET_ErrorString() );
		return;
	}

	// send socks authentication handshake
	if ( *net_socksUsername->string || *net_socksPassword->string ) {
		rfc1929 = qtrue;
	}
	else {
		rfc1929 = qfalse;
	}

	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, buf, len, 0 ) == SOCKET_ERROR ) {
		err = socketError;
		Com_Printf( "NET_OpenSocks: send: %s\n", NET_ErrorString() );
		return;
	}

	// get the response
	len = recv( socks_socket, buf, 64, 0 );
	if ( len == SOCKET_ERROR ) {
		err = socketError;
		Com_Printf( "NET_OpenSocks: recv: %s\n", NET_ErrorString() );
		return;
	}
	if ( len != 2 || buf[0] != 5 ) {
		Com_Printf( "NET_OpenSocks: bad response\n" );
		return;
	}
	switch( buf[1] ) {
	case 0:	// no authentication
		break;
	case 2: // username/password authentication
		break;
	default:
		Com_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 = strlen( net_socksUsername->string );
		plen = strlen( net_socksPassword->string );

		buf[0] = 1;		// username/password authentication version
		buf[1] = ulen;
		if ( ulen ) {
			memcpy( &buf[2], net_socksUsername->string, ulen );
		}
		buf[2 + ulen] = plen;
		if ( plen ) {
			memcpy( &buf[3 + ulen], net_socksPassword->string, plen );
		}

		// send it
		if ( send( socks_socket, buf, 3 + ulen + plen, 0 ) == SOCKET_ERROR ) {
			err = socketError;
			Com_Printf( "NET_OpenSocks: send: %s\n", NET_ErrorString() );
			return;
		}

		// get the response
		len = recv( socks_socket, buf, 64, 0 );
		if ( len == SOCKET_ERROR ) {
			err = socketError;
			Com_Printf( "NET_OpenSocks: recv: %s\n", NET_ErrorString() );
			return;
		}
		if ( len != 2 || buf[0] != 1 ) {
			Com_Printf( "NET_OpenSocks: bad response\n" );
			return;
		}
		if ( buf[1] != 0 ) {
			Com_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, buf, 10, 0 ) == SOCKET_ERROR ) {
		err = socketError;
		Com_Printf( "NET_OpenSocks: send: %s\n", NET_ErrorString() );
		return;
	}

	// get the response
	len = recv( socks_socket, buf, 64, 0 );
	if( len == SOCKET_ERROR ) {
		err = socketError;
		Com_Printf( "NET_OpenSocks: recv: %s\n", NET_ErrorString() );
		return;
	}
	if( len < 2 || buf[0] != 5 ) {
		Com_Printf( "NET_OpenSocks: bad response\n" );
		return;
	}
	// check completion code
	if( buf[1] != 0 ) {
		Com_Printf( "NET_OpenSocks: request denied: %i\n", buf[1] );
		return;
	}
	if( buf[3] != 1 ) {
		Com_Printf( "NET_OpenSocks: relay address is not IPV4: %i\n", buf[3] );
		return;
	}
	((struct sockaddr_in *)&socksRelayAddr)->sin_family = AF_INET;
	((struct sockaddr_in *)&socksRelayAddr)->sin_addr.s_addr = *(int *)&buf[4];
	((struct sockaddr_in *)&socksRelayAddr)->sin_port = *(short *)&buf[8];
	memset( ((struct sockaddr_in *)&socksRelayAddr)->sin_zero, 0, 8 );

	usingSocks = qtrue;
}


/*
=====================
NET_GetLocalAddress
=====================
*/
int NET_AddLocalAddress(struct sockaddr *sa)
{
	struct sockaddr_in *sin;
	struct sockaddr_in6 *sin6;
	int index;

	if(sa->sa_family == AF_INET)
	{
		if(numIP > MAX_IPS)
			return -1;

		sin = (struct sockaddr_in *) sa;
		
		for(index = 0; index < numIP; index++)
		{
			if( !memcmp(&localIP[index], &sin->sin_addr.s_addr, sizeof(*localIP)) )
				break;
		}

		if(index >= numIP)
			memcpy(localIP[numIP++], &sin->sin_addr.s_addr, sizeof(*localIP));
	
		return numIP - 1;
	}
	else if(sa->sa_family == AF_INET6)
	{
		if(numIP6 > MAX_IPS)
			return -1;

		sin6 = (struct sockaddr_in6 *) sa;
		
		for(index = 0; index < numIP6; index++)
		{
			if( !memcmp(&localIP6[index], &sin6->sin6_addr, sizeof(*localIP6)) )
				break;
		}

		if(index >= numIP6)
			memcpy(localIP6[numIP6++], &sin6->sin6_addr, sizeof(*localIP6));
		
		return numIP6 - 1;
	}

	return -1;
}

void NET_AddLocalNetmask(struct sockaddr *sa, int position)
{
	struct sockaddr_in *sin;
	struct sockaddr_in6 *sin6;

	if(sa->sa_family == AF_INET)
	{
		sin = (struct sockaddr_in *) sa;
		
		memcpy(localIPmask[position], &sin->sin_addr.s_addr, sizeof(*localIPmask));
	}
	else if(sa->sa_family == AF_INET6)
	{
		sin6 = (struct sockaddr_in6 *) sa;
		
		memcpy(localIP6mask[position], &sin6->sin6_addr, sizeof(*localIP6mask));
	}
}

#if defined(__linux__) || defined(MACOSX) || defined(__BSD__)
void NET_GetLocalAddress(void)
{
	struct ifaddrs *ifap, *search;
	int retval;

	if(getifaddrs(&ifap))
		Com_Printf("NET_GetLocalAddress: Unable to get list of network interfaces: %s\n", NET_ErrorString());
	else
	{
		for(search = ifap; search; search = search->ifa_next)
		{
			if((retval = NET_AddLocalAddress(search->ifa_addr)) >= 0)
				NET_AddLocalNetmask(search->ifa_netmask, retval);
		}
	
		freeifaddrs(ifap);
		
		Sys_ShowIP();
	}
}
#else
void NET_GetLocalAddress( void ) {
	char				hostname[256];
	struct addrinfo		hint;
	struct addrinfo 	*res = NULL;
	struct addrinfo 	*search;

	if(gethostname( hostname, 256 ) == SOCKET_ERROR)
		return;

	Com_Printf( "Hostname: %s\n", hostname );
	
	memset(&hint, 0, sizeof(hint));
	
	hint.ai_family = AF_UNSPEC;
	hint.ai_socktype = SOCK_DGRAM;
	
	if(getaddrinfo(hostname, NULL, &hint, &res))
 		return;

	// add all IPs from returned list.
	for(search = res; search; search = search->ai_next)
		NET_AddLocalAddress(search->ai_addr);
	
	memset(localIPmask, 0, sizeof(localIPmask));
	memset(localIP6mask, 0xFF, sizeof(localIP6mask));

	Sys_ShowIP();
}
#endif

/*
====================
NET_OpenIP
====================
*/
void NET_OpenIP( void ) {
	int		i;
	int		err;
	int		port;
	int		port6;

	net_ip = Cvar_Get( "net_ip", "localhost", CVAR_LATCH );
	net_ip6 = Cvar_Get( "net_ip6", "localhost", CVAR_LATCH );
	net_port = Cvar_Get( "net_port", va( "%i", PORT_SERVER ), CVAR_LATCH );
	net_port6 = Cvar_Get( "net_port6", va( "%i", PORT_SERVER ), CVAR_LATCH );
	
	port = net_port->integer;
	port6 = net_port6->integer;

	// automatically scan for a valid port, so multiple
	// dedicated servers can be started without requiring
	// a different net_port for each one
	if(net_enabled->integer & NET_ENABLEV4)
	{
		for( i = 0 ; i < 10 ; i++ ) {
			ip_socket = NET_IPSocket( net_ip->string, port + i, &err );
			if (ip_socket != INVALID_SOCKET) {
				Cvar_SetValue( "net_port", port + i );

				if (net_socksEnabled->integer)
					NET_OpenSocks( port + i );

				break;
			}
			else
			{
				if(err == EAFNOSUPPORT)
					break;
			}
		}
		
		if(ip_socket == INVALID_SOCKET)
			Com_Printf( "WARNING: Couldn't bind to a v4 ip address.\n");
	}
	
	if(net_enabled->integer & NET_ENABLEV6)
	{
		for( i = 0 ; i < 10 ; i++ )
		{
			ip6_socket = NET_IP6Socket(net_ip6->string, port6 + i, &err);
			if (ip6_socket != INVALID_SOCKET)
			{
				Cvar_SetValue( "net_port6", port6 + i );
				break;
			}
			else
			{
				if(err == EAFNOSUPPORT)
					break;
			}
		}
		if(ip6_socket == INVALID_SOCKET)
			Com_Printf( "WARNING: Couldn't bind to a v6 ip address.\n");
	}

	NET_GetLocalAddress();
}


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


/*
====================
NET_GetCvars
====================
*/
static qboolean NET_GetCvars( void ) {
	qboolean	modified;

	modified = qfalse;

	if( net_enabled && net_enabled->modified ) {
		modified = qtrue;
	}
	
#ifdef DEDICATED
	// I want server owners to explicitly turn ipv6 support on.
	net_enabled = Cvar_Get( "net_enabled", "1", CVAR_LATCH | CVAR_ARCHIVE );
#else
	/* End users have it enabled so they can connect to ipv6-only hosts, but ipv4 will be
	 * used if available due to ping */
	net_enabled = Cvar_Get( "net_enabled", "3", CVAR_LATCH | CVAR_ARCHIVE );
#endif

	if( net_socksEnabled && net_socksEnabled->modified ) {
		modified = qtrue;
	}
	net_socksEnabled = Cvar_Get( "net_socksEnabled", "0", CVAR_LATCH | CVAR_ARCHIVE );

	if( net_socksServer && net_socksServer->modified ) {
		modified = qtrue;
	}
	net_socksServer = Cvar_Get( "net_socksServer", "", CVAR_LATCH | CVAR_ARCHIVE );

	if( net_socksPort && net_socksPort->modified ) {
		modified = qtrue;
	}
	net_socksPort = Cvar_Get( "net_socksPort", "1080", CVAR_LATCH | CVAR_ARCHIVE );

	if( net_socksUsername && net_socksUsername->modified ) {
		modified = qtrue;
	}
	net_socksUsername = Cvar_Get( "net_socksUsername", "", CVAR_LATCH | CVAR_ARCHIVE );

	if( net_socksPassword && net_socksPassword->modified ) {
		modified = qtrue;
	}
	net_socksPassword = Cvar_Get( "net_socksPassword", "", CVAR_LATCH | CVAR_ARCHIVE );


	return modified;
}


/*
====================
NET_Config
====================
*/
void NET_Config( qboolean enableNetworking ) {
	qboolean	modified;
	qboolean	stop;
	qboolean	start;

	// get any latched changes to cvars
	modified = NET_GetCvars();

	if( !net_enabled->integer ) {
		enableNetworking = 0;
	}

	// if enable state is the same and no cvars were modified, we have nothing to do
	if( enableNetworking == networkingEnabled && !modified ) {
		return;
	}

	if( enableNetworking == networkingEnabled ) {
		if( enableNetworking ) {
			stop = qtrue;
			start = qtrue;
		}
		else {
			stop = qfalse;
			start = qfalse;
		}
	}
	else {
		if( enableNetworking ) {
			stop = qfalse;
			start = qtrue;
		}
		else {
			stop = qtrue;
			start = qfalse;
		}
		networkingEnabled = enableNetworking;
	}

	if( stop ) {
		if ( ip_socket != INVALID_SOCKET ) {
			closesocket( ip_socket );
			ip_socket = INVALID_SOCKET;
		}

		if ( ip6_socket != INVALID_SOCKET ) {
			closesocket( ip6_socket );
			ip6_socket = INVALID_SOCKET;
		}

		if ( socks_socket != INVALID_SOCKET ) {
			closesocket( socks_socket );
			socks_socket = INVALID_SOCKET;
		}
		
	}

	if( start ) {
		if (net_enabled->integer) {
			NET_OpenIP();
		}
	}
}


/*
====================
NET_Init
====================
*/
void NET_Init( void ) {
#ifdef _WIN32
	int		r;

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

	winsockInitialized = qtrue;
	Com_Printf( "Winsock Initialized\n" );
#endif

	// this is really just to get the cvars registered
	NET_GetCvars();

	NET_Config( qtrue );
}


/*
====================
NET_Shutdown
====================
*/
void NET_Shutdown( void ) {
	if ( !networkingEnabled ) {
		return;
	}

	NET_Config( qfalse );

#ifdef _WIN32
	WSACleanup();
	winsockInitialized = qfalse;
#endif
}


/*
====================
NET_Sleep

Sleeps msec or until something happens on the network
====================
*/
void NET_Sleep( int msec ) {
	struct timeval timeout;
	fd_set	fdset;
	int highestfd = -1;

	if (!com_dedicated->integer)
		return; // we're not a server, just run full speed

	if (ip_socket == INVALID_SOCKET && ip6_socket == INVALID_SOCKET)
		return;

	if (msec < 0 )
		return;

	FD_ZERO(&fdset);

	if(ip_socket != INVALID_SOCKET)
	{
		FD_SET(ip_socket, &fdset);

		if(ip_socket > highestfd)
			highestfd = ip_socket;
	}
	if(ip6_socket != INVALID_SOCKET)
	{
		FD_SET(ip6_socket, &fdset);
		
		if(ip6_socket > highestfd)
			highestfd = ip6_socket;
	}

	timeout.tv_sec = msec/1000;
	timeout.tv_usec = (msec%1000)*1000;
	select(ip_socket+1, &fdset, NULL, NULL, &timeout);
}


/*
====================
NET_Restart_f
====================
*/
void NET_Restart( void ) {
	NET_Config( networkingEnabled );
}