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/*

Copyright (C) 1996-1997 Id Software, Inc.

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.

*/

// net_mpath.c

#include 

#include "quakedef.h"

#include "mpdosock.h"

short flat_selector;

int WSAGetLastError(void);

void sockets_flush(void);

extern cvar_t hostname;

#define MAXHOSTNAMELEN		256

static int net_acceptsocket = -1;		// socket for fielding new connections

static int net_controlsocket;

static int net_broadcastsocket = 0;

//static qboolean ifbcastinit = false;

static struct qsockaddr broadcastaddr;

static unsigned long myAddr;

#include "net_mp.h"

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

int MPATH_Init (void)

{

	int		i;

	struct hostent *local = NULL;

	char	buff[MAXHOSTNAMELEN];

	struct qsockaddr addr;

	char	*p;

	if (COM_CheckParm ("-mpath") == 0)

		return -1;

   flat_selector = __dpmi_allocate_ldt_descriptors(1);

   if (flat_selector == -1) {

      Con_Printf("MPATH_Init: Can't get flat selector\n");

      return -1;

   }

   if (__dpmi_set_segment_base_address(flat_selector, 0) == -1) {

      Con_Printf("MPATH_Init: Can't seg flat base!\n");

      return -1;

   }

   if (__dpmi_set_segment_limit(flat_selector, 0xffffffff) == -1) {

      Con_Printf("MPATH_Init: Can't set segment limit\n");

      return -1;

   }

	// determine my name & address

	if (gethostname(buff, MAXHOSTNAMELEN) == 0)

		local = gethostbyname(buff);

	if (local)

	{

		myAddr = *(int *)local->h_addr_list[0];

		// if the quake hostname isn't set, set it to the machine name

		if (Q_strcmp(hostname.string, "UNNAMED") == 0)

		{

			// see if it's a text IP address (well, close enough)

			for (p = buff; *p; p++)

				if ((*p < '0' || *p > '9') && *p != '.')

					break;

			// if it is a real name, strip off the domain; we only want the host

			if (*p)

			{

				for (i = 0; i < 15; i++)

					if (buff[i] == '.')

						break;

				buff[i] = 0;

			}

			Cvar_Set ("hostname", buff);

		}

	}

	if ((net_controlsocket = MPATH_OpenSocket (0)) == -1)

		Sys_Error("MPATH_Init: Unable to open control socket\n");

	((struct sockaddr_in *)&broadcastaddr)->sin_family = AF_INET;

	((struct sockaddr_in *)&broadcastaddr)->sin_addr.s_addr = INADDR_BROADCAST;

	((struct sockaddr_in *)&broadcastaddr)->sin_port = htons(net_hostport);

	MPATH_GetSocketAddr (net_controlsocket, &addr);

	Q_strcpy(my_tcpip_address,  MPATH_AddrToString (&addr));

	p = Q_strrchr (my_tcpip_address, ':');

	if (p)

		*p = 0;

	Con_Printf("MPath Initialized\n");

	tcpipAvailable = true;

	return net_controlsocket;

}

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

void MPATH_Shutdown (void)

{

	MPATH_Listen (false);

	MPATH_CloseSocket (net_controlsocket);

}

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

void MPATH_Listen (qboolean state)

{

	// enable listening

	if (state)

	{

		if (net_acceptsocket != -1)

			return;

		if ((net_acceptsocket = MPATH_OpenSocket (net_hostport)) == -1)

			Sys_Error ("MPATH_Listen: Unable to open accept socket\n");

		return;

	}

	// disable listening

	if (net_acceptsocket == -1)

		return;

	MPATH_CloseSocket (net_acceptsocket);

	net_acceptsocket = -1;

}

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

int MPATH_OpenSocket (int port)

{

	int newsocket;

	struct sockaddr_in address;

	u_long _true = 1;

	if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)

		return -1;

	if (ioctlsocket (newsocket, FIONBIO, &_true) == -1)

		goto ErrorReturn;

	address.sin_family = AF_INET;

	address.sin_addr.s_addr = INADDR_ANY;

	address.sin_port = htons(port);

	if( bind (newsocket, (void *)&address, sizeof(address)) == -1)

		goto ErrorReturn;

	return newsocket;

ErrorReturn:

	closesocket (newsocket);

	return -1;

}

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

int MPATH_CloseSocket (int socket)

{

	if (socket == net_broadcastsocket)

		net_broadcastsocket = 0;

	return closesocket (socket);

}

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

/*

============

PartialIPAddress

this lets you type only as much of the net address as required, using

the local network components to fill in the rest

============

*/

static int PartialIPAddress (char *in, struct qsockaddr *hostaddr)

{

	char buff[256];

	char *b;

	int addr;

	int num;

	int mask;

	int run;

	int port;

	buff[0] = '.';

	b = buff;

	strcpy(buff+1, in);

	if (buff[1] == '.')

		b++;

	addr = 0;

	mask=-1;

	while (*b == '.')

	{

		b++;

		num = 0;

		run = 0;

		while (!( *b < '0' || *b > '9'))

		{

		  num = num*10 + *b++ - '0';

		  if (++run > 3)

		  	return -1;

		}

		if ((*b < '0' || *b > '9') && *b != '.' && *b != ':' && *b != 0)

			return -1;

		if (num < 0 || num > 255)

			return -1;

		mask<<=8;

		addr = (addr<<8) + num;

	}

	if (*b++ == ':')

		port = Q_atoi(b);

	else

		port = net_hostport;

	hostaddr->sa_family = AF_INET;

	((struct sockaddr_in *)hostaddr)->sin_port = htons((short)port);

	((struct sockaddr_in *)hostaddr)->sin_addr.s_addr = (myAddr & htonl(mask)) | htonl(addr);

	return 0;

}

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

int MPATH_Connect (int socket, struct qsockaddr *addr)

{

	return 0;

}

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

int MPATH_CheckNewConnections (void)

{

	char buf[4];

	if (net_acceptsocket == -1)

		return -1;

	if (recvfrom (net_acceptsocket, buf, 4, MSG_PEEK, NULL, NULL) > 0)

		return net_acceptsocket;

	return -1;

}

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

int MPATH_Read (int socket, byte *buf, int len, struct qsockaddr *addr)

{

	int addrlen = sizeof (struct qsockaddr);

	int ret;

	ret = recvfrom (socket, buf, len, 0, (struct sockaddr *)addr, &addrlen);

	if (ret == -1)

	{

		int errno = WSAGetLastError();

		if (errno == WSAEWOULDBLOCK || errno == WSAECONNREFUSED)

			return 0;

	}

	return ret;

}

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

int MPATH_MakeSocketBroadcastCapable (int socket)

{

	int	i = 1;

	// make this socket broadcast capable

	if (setsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) < 0)

		return -1;

	net_broadcastsocket = socket;

	return 0;

}

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

int MPATH_Broadcast (int socket, byte *buf, int len)

{

	int ret;

	if (socket != net_broadcastsocket)

	{

		if (net_broadcastsocket != 0)

			Sys_Error("Attempted to use multiple broadcasts sockets\n");

		ret = MPATH_MakeSocketBroadcastCapable (socket);

		if (ret == -1)

		{

			Con_Printf("Unable to make socket broadcast capable\n");

			return ret;

		}

	}

	return MPATH_Write (socket, buf, len, &broadcastaddr);

}

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

int MPATH_Write (int socket, byte *buf, int len, struct qsockaddr *addr)

{

	int ret;

	ret = sendto (socket, buf, len, 0, (struct sockaddr *)addr, sizeof(struct qsockaddr));

	if (ret == -1)

		if (WSAGetLastError() == WSAEWOULDBLOCK)

			return 0;

	sockets_flush();

	return ret;

}

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

char *MPATH_AddrToString (struct qsockaddr *addr)

{

	static char buffer[22];

	int haddr;

	haddr = ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr);

	sprintf(buffer, "%d.%d.%d.%d:%d", (haddr >> 24) & 0xff, (haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff, ntohs(((struct sockaddr_in *)addr)->sin_port));

	return buffer;

}

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

int MPATH_StringToAddr (char *string, struct qsockaddr *addr)

{

	int ha1, ha2, ha3, ha4, hp;

	int ipaddr;

	sscanf(string, "%d.%d.%d.%d:%d", &ha1, &ha2, &ha3, &ha4, &hp);

	ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4;

	addr->sa_family = AF_INET;

	((struct sockaddr_in *)addr)->sin_addr.s_addr = htonl(ipaddr);

	((struct sockaddr_in *)addr)->sin_port = htons(hp);

	return 0;

}

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

int MPATH_GetSocketAddr (int socket, struct qsockaddr *addr)

{

	int addrlen = sizeof(struct qsockaddr);

	unsigned int a;

	Q_memset(addr, 0, sizeof(struct qsockaddr));

	getsockname(socket, (struct sockaddr *)addr, &addrlen);

	a = ((struct sockaddr_in *)addr)->sin_addr.s_addr;

	if (a == 0 || a == inet_addr("127.0.0.1"))

		((struct sockaddr_in *)addr)->sin_addr.s_addr = myAddr;

	return 0;

}

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

int MPATH_GetNameFromAddr (struct qsockaddr *addr, char *name)

{

	struct hostent *hostentry;

	hostentry = gethostbyaddr ((char *)&((struct sockaddr_in *)addr)->sin_addr, sizeof(struct in_addr), AF_INET);

	if (hostentry)

	{

		Q_strncpy (name, (char *)hostentry->h_name, NET_NAMELEN - 1);

		return 0;

	}

	Q_strcpy (name, MPATH_AddrToString (addr));

	return 0;

}

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

int MPATH_GetAddrFromName(char *name, struct qsockaddr *addr)

{

	struct hostent *hostentry;

	if (name[0] >= '0' && name[0] <= '9')

		return PartialIPAddress (name, addr);

	hostentry = gethostbyname (name);

	if (!hostentry)

		return -1;

	addr->sa_family = AF_INET;

	((struct sockaddr_in *)addr)->sin_port = htons(net_hostport);

	((struct sockaddr_in *)addr)->sin_addr.s_addr = *(int *)hostentry->h_addr_list[0];

	return 0;

}

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

int MPATH_AddrCompare (struct qsockaddr *addr1, struct qsockaddr *addr2)

{

	if (addr1->sa_family != addr2->sa_family)

		return -1;

	if (((struct sockaddr_in *)addr1)->sin_addr.s_addr != ((struct sockaddr_in *)addr2)->sin_addr.s_addr)

		return -1;

	if (((struct sockaddr_in *)addr1)->sin_port != ((struct sockaddr_in *)addr2)->sin_port)

		return 1;

	return 0;

}

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

int MPATH_GetSocketPort (struct qsockaddr *addr)

{

	return ntohs(((struct sockaddr_in *)addr)->sin_port);

}

int MPATH_SetSocketPort (struct qsockaddr *addr, int port)

{

	((struct sockaddr_in *)addr)->sin_port = htons(port);

	return 0;

}

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