/*
Copyright (C) 1999-2007 id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant 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.

GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

//===========================================================================
//
// Name:         l_net_wins.c
// Function:     WinSock
// Programmer:   MrElusive
// Last update:  TTimo: cross-platform version, l_net library
// Tab Size:     2
// Notes:
//===========================================================================

//#include <windows.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "l_net.h"
#include "l_net_wins.h"

#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <errno.h>
#include <netdb.h>
#define SOCKET_ERROR -1
#define INVALID_SOCKET -1

extern void WinPrint(char *str, ...);

#define WinError WinPrint

#define qtrue	1
#define qfalse	0

#define ioctlsocket ioctl
#define closesocket close

int WSAGetLastError()
{
	return errno;
}

/*
typedef struct tag_error_struct
{
    int     errnum;
    LPSTR   errstr;
} ERROR_STRUCT;
*/

typedef struct tag_error_struct
{
    int     errnum;
    const char *errstr;
} ERROR_STRUCT;

#define	NET_NAMELEN			64

static char my_tcpip_address[NET_NAMELEN];

#define	DEFAULTnet_hostport	26000

#define MAXHOSTNAMELEN		256

static int net_acceptsocket = -1;		// socket for fielding new connections
static int net_controlsocket;
static int net_hostport;				// udp port number for acceptsocket
static int net_broadcastsocket = 0;
//static qboolean ifbcastinit = qfalse;
//static struct sockaddr_s broadcastaddr;
static struct sockaddr_s broadcastaddr;

static unsigned long myAddr;

ERROR_STRUCT errlist[] = {
  {EACCES,"EACCES - The address is protected, user is not root"},
  {EAGAIN,"EAGAIN - Operation on non-blocking socket that cannot return immediatly"},
  {EBADF, "EBADF - sockfd is not a valid descriptor"},
  {EFAULT, "EFAULT - The parameter is not in a writable part of the user address space"},
  {EINVAL,"EINVAL - The socket is already bound to an address"},
  {ENOBUFS,"ENOBUFS - not enough memory"},
  {ENOMEM, "ENOMEM - not enough memory"},
  {ENOTCONN, "ENOTCONN - not connected"},
  {ENOTSOCK,"ENOTSOCK - Argument is file descriptor not a socket"},
  {EOPNOTSUPP,"ENOTSUPP - The referenced socket is not of type SOCK_STREAM"},
  {EPERM, "EPERM - Firewall rules forbid connection"},
  {-1, NULL}
};

//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
char *WINS_ErrorMessage(int error)
{
    int search = 0;

    if (!error) return "No error occurred";

	 for (search = 0; errlist[search].errstr; search++)
	 {
		if (error == errlist[search].errnum)
				return (char *)errlist[search].errstr;
	 } //end for

    return "Unknown error";
} //end of the function WINS_ErrorMessage
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_Init(void)
{
	int		i;
	struct hostent *local;
	char	buff[MAXHOSTNAMELEN];
	struct sockaddr_s addr;
	char	*p;
/*
 linux doesn't have anything to initialize for the net
 "Windows .. built for the internet .. the internet .. built with unix"
 */
#if 0
	int		r;
	WORD	wVersionRequested;

	wVersionRequested = MAKEWORD(2, 2);

	r = WSAStartup (wVersionRequested, &winsockdata);

	if (r)
	{
		WinPrint("Winsock initialization failed.\n");
		return -1;
	}
#endif
	/*
	i = COM_CheckParm ("-udpport");
	if (i == 0)*/
		net_hostport = DEFAULTnet_hostport;
	/*
	else if (i < com_argc-1)
		net_hostport = Q_atoi (com_argv[i+1]);
	else
		Sys_Error ("WINS_Init: you must specify a number after -udpport");
	*/

	// determine my name & address
	gethostname(buff, MAXHOSTNAMELEN);
	local = gethostbyname(buff);

	// When hostname can not be resolved, return gracefully
	if( local == 0 )
 	{
		WinError("WINS_Init: Unable to resolve hostname\n");
		return 0;
	}

	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);
	}

  //++timo WTF is that net_controlsocket? it's sole purpose is to retrieve the local IP?
	if ((net_controlsocket = WINS_OpenSocket (0)) == SOCKET_ERROR)
		WinError("WINS_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((u_short)net_hostport);

	WINS_GetSocketAddr (net_controlsocket, &addr);
	strcpy(my_tcpip_address,  WINS_AddrToString (&addr));
	p = strrchr (my_tcpip_address, ':');
	if (p) *p = 0;
	WinPrint("Winsock Initialized\n");

	return net_controlsocket;
} //end of the function WINS_Init
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
char *WINS_MyAddress(void)
{
	return my_tcpip_address;
} //end of the function WINS_MyAddress
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
void WINS_Shutdown(void)
{
	//WINS_Listen(0);
	WINS_CloseSocket(net_controlsocket);
//	WSACleanup();
	//
	WinPrint("Winsock Shutdown\n");
} //end of the function WINS_Shutdown
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
/*
void WINS_Listen(int state)
{
	// enable listening
	if (state)
	{
		if (net_acceptsocket != -1)
			return;
		if ((net_acceptsocket = WINS_OpenSocket (net_hostport)) == -1)
			WinError ("WINS_Listen: Unable to open accept socket\n");
		return;
	}

	// disable listening
	if (net_acceptsocket == -1)
		return;
	WINS_CloseSocket (net_acceptsocket);
	net_acceptsocket = -1;
} //end of the function WINS_Listen*/
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_OpenSocket(int port)
{
	int newsocket;
	struct sockaddr_in address;
	u_long _true = 1;

	if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == SOCKET_ERROR)
	{
		WinPrint("WINS_OpenSocket: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		return -1;
	} //end if

	if (ioctlsocket (newsocket, FIONBIO, &_true) == SOCKET_ERROR)
	{
		WinPrint("WINS_OpenSocket: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		closesocket(newsocket);
		return -1;
	} //end if

	memset((char *) &address, 0, sizeof(address));
	address.sin_family = AF_INET;
	address.sin_addr.s_addr = INADDR_ANY;
	address.sin_port = htons((u_short)port);
	if( bind (newsocket, (void *)&address, sizeof(address)) == -1)
	{
		WinPrint("WINS_OpenSocket: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		closesocket(newsocket);
		return -1;
	} //end if

	return newsocket;
} //end of the function WINS_OpenSocket
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_OpenReliableSocket(int port)
{
	int newsocket;
	struct sockaddr_in address;
	qboolean _true = 0xFFFFFFFF;

	//IPPROTO_TCP
	//
	if ((newsocket = socket(AF_INET, SOCK_STREAM, 0)) == -1)
	{
		WinPrint("WINS_OpenReliableSocket: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		return -1;
	} //end if

	memset((char *) &address, 0, sizeof(address));
	address.sin_family = AF_INET;
	address.sin_addr.s_addr = htonl(INADDR_ANY);
	address.sin_port = htons((u_short)port);
	if (bind(newsocket, (void *)&address, sizeof(address)) == -1)
	{
		WinPrint("WINS_OpenReliableSocket: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		closesocket(newsocket);
		return -1;
	} //end if

  //
	if (setsockopt(newsocket, IPPROTO_TCP, TCP_NODELAY, (void *) &_true, sizeof(int)) == -1)
	{
		WinPrint("WINS_OpenReliableSocket: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		WinPrint("setsockopt error\n");
	} //end if

	return newsocket;
} //end of the function WINS_OpenReliableSocket
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_Listen(int socket)
{
	u_long _true = 1;

	if (ioctlsocket(socket, FIONBIO, &_true) == -1)
	{
		WinPrint("WINS_Listen: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		return -1;
	} //end if
	if (listen(socket, SOMAXCONN) == SOCKET_ERROR)
	{
		WinPrint("WINS_Listen: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		return -1;
	} //end if
	return 0;
} //end of the function WINS_Listen
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_Accept(int socket, struct sockaddr_s *addr)
{
	int addrlen = sizeof (struct sockaddr_s);
	int newsocket;
	qboolean _true = 1;

	newsocket = accept(socket, (struct sockaddr *)addr, &addrlen);
	if (newsocket == INVALID_SOCKET)
	{
    if (errno == EAGAIN) return -1;
		WinPrint("WINS_Accept: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		return -1;
	} //end if
	//
	if (setsockopt(newsocket, IPPROTO_TCP, TCP_NODELAY, (void *) &_true, sizeof(int)) == SOCKET_ERROR)
	{
		WinPrint("WINS_Accept: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		WinPrint("setsockopt error\n");
	} //end if
	return newsocket;
} //end of the function WINS_Accept
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_CloseSocket(int socket)
{
	/*
	if (socket == net_broadcastsocket)
		net_broadcastsocket = 0;
	*/
//	shutdown(socket, SD_SEND);

	if (closesocket(socket) == SOCKET_ERROR)
	{
		WinPrint("WINS_CloseSocket: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		return SOCKET_ERROR;
	} //end if
	return 0;
} //end of the function WINS_CloseSocket
//===========================================================================
// this lets you type only as much of the net address as required, using
// the local network components to fill in the rest
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
static int PartialIPAddress (char *in, struct sockaddr_s *hostaddr)
{
	char buff[256];
	char *b;
	int addr;
	int num;
	int mask;

	buff[0] = '.';
	b = buff;
	strcpy(buff+1, in);
	if (buff[1] == '.') b++;

	addr = 0;
	mask=-1;
	while (*b == '.')
	{
		num = 0;
		if (*++b < '0' || *b > '9') return -1;
		while (!( *b < '0' || *b > '9'))
		  num = num*10 + *(b++) - '0';
		mask<<=8;
		addr = (addr<<8) + num;
	}

	hostaddr->sa_family = AF_INET;
	((struct sockaddr_in *)hostaddr)->sin_port = htons((u_short)net_hostport);
	((struct sockaddr_in *)hostaddr)->sin_addr.s_addr = (myAddr & htonl(mask)) | htonl(addr);

	return 0;
} //end of the function PartialIPAddress
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_Connect(int socket, struct sockaddr_s *addr)
{
	int ret;
	u_long _true2 = 0xFFFFFFFF;

	ret = connect(socket, (struct sockaddr *)addr, sizeof(struct sockaddr_s));
	if (ret == SOCKET_ERROR)
	{
		WinPrint("WINS_Connect: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		return -1;
	} //end if
	if (ioctlsocket(socket, FIONBIO, &_true2) == -1)
	{
		WinPrint("WINS_Connect: %s\n", WINS_ErrorMessage(WSAGetLastError()));
		return -1;
	} //end if
	return 0;
} //end of the function WINS_Connect
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_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;
} //end of the function WINS_CheckNewConnections
//===========================================================================
// returns the number of bytes read
// 0 if no bytes available
// -1 on failure
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_Read(int socket, byte *buf, int len, struct sockaddr_s *addr)
{
	int addrlen = sizeof (struct sockaddr_s);
	int ret;

	if (addr)
	{
		ret = recvfrom(socket, buf, len, 0, (struct sockaddr *)addr, &addrlen);
		if (ret == -1)
		{
//			errno = WSAGetLastError();

			if (errno == EAGAIN || errno == ENOTCONN)
				return 0;
		} //end if
	} //end if
	else
	{
		ret = recv(socket, buf, len, 0);
    // if there's no data on the socket ret == -1 and errno == EAGAIN
    // MSDN states that if ret == 0 the socket has been closed
    // man recv doesn't say anything
    if (ret == 0)
      return -1;
		if (ret == SOCKET_ERROR)
		{
//			errno = WSAGetLastError();

			if (errno == EAGAIN || errno == ENOTCONN)
				return 0;
		} //end if
	} //end else
	if (ret == SOCKET_ERROR)
	{
		WinPrint("WINS_Read: %s\n", WINS_ErrorMessage(WSAGetLastError()));
	} //end if
	return ret;
} //end of the function WINS_Read
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_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;
} //end of the function WINS_MakeSocketBroadcastCapable
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_Broadcast (int socket, byte *buf, int len)
{
	int ret;

	if (socket != net_broadcastsocket)
	{
		if (net_broadcastsocket != 0)
			WinError("Attempted to use multiple broadcasts sockets\n");
		ret = WINS_MakeSocketBroadcastCapable (socket);
		if (ret == -1)
		{
			WinPrint("Unable to make socket broadcast capable\n");
			return ret;
		}
	}

	return WINS_Write (socket, buf, len, &broadcastaddr);
} //end of the function WINS_Broadcast
//===========================================================================
// returns qtrue on success or qfalse on failure
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_Write(int socket, byte *buf, int len, struct sockaddr_s *addr)
{
	int ret = 0, written;

	if (addr)
	{
		written = 0;
		while(written < len)
		{
			ret = sendto (socket, &buf[written], len-written, 0, (struct sockaddr *)addr, sizeof(struct sockaddr_s));
			if (ret == SOCKET_ERROR)
			{
				if (WSAGetLastError() != EAGAIN)
					return qfalse;
					//++timo FIXME: what is this used for?
//				Sleep(1000);
			} //end if
			else
			{
				written += ret;
			}
		}
	} //end if
	else
	{
		written = 0;
		while(written < len)
		{
			ret = send(socket, buf, len, 0);
			if (ret == SOCKET_ERROR)
			{
				if (WSAGetLastError() != EAGAIN)
					return qfalse;
					//++timo FIXME: what is this used for?
//				Sleep(1000);
			} //end if
			else
			{
				written += ret;
			}
		}
	} //end else
	if (ret == SOCKET_ERROR)
	{
		WinPrint("WINS_Write: %s\n", WINS_ErrorMessage(WSAGetLastError()));
	} //end if
	return (ret == len);
} //end of the function WINS_Write
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
char *WINS_AddrToString (struct sockaddr_s *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;
} //end of the function WINS_AddrToString
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_StringToAddr(char *string, struct sockaddr_s *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((u_short)hp);
	return 0;
} //end of the function WINS_StringToAddr
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_GetSocketAddr(int socket, struct sockaddr_s *addr)
{
	int addrlen = sizeof(struct sockaddr_s);
	unsigned int a;

	memset(addr, 0, sizeof(struct sockaddr_s));
	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;
} //end of the function WINS_GetSocketAddr
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_GetNameFromAddr (struct sockaddr_s *addr, char *name)
{
	struct hostent *hostentry;

	hostentry = gethostbyaddr ((char *)&((struct sockaddr_in *)addr)->sin_addr, sizeof(struct in_addr), AF_INET);
	if (hostentry)
	{
		strncpy (name, (char *)hostentry->h_name, NET_NAMELEN - 1);
		return 0;
	}

	strcpy (name, WINS_AddrToString (addr));
	return 0;
} //end of the function WINS_GetNameFromAddr
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_GetAddrFromName(char *name, struct sockaddr_s *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((u_short)net_hostport);
	((struct sockaddr_in *)addr)->sin_addr.s_addr = *(int *)hostentry->h_addr_list[0];

	return 0;
} //end of the function WINS_GetAddrFromName
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_AddrCompare (struct sockaddr_s *addr1, struct sockaddr_s *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;
} //end of the function WINS_AddrCompare
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_GetSocketPort (struct sockaddr_s *addr)
{
	return ntohs(((struct sockaddr_in *)addr)->sin_port);
} //end of the function WINS_GetSocketPort
//===========================================================================
//
// Parameter:				-
// Returns:					-
// Changes Globals:		-
//===========================================================================
int WINS_SetSocketPort (struct sockaddr_s *addr, int port)
{
	((struct sockaddr_in *)addr)->sin_port = htons((u_short)port);
	return 0;
} //end of the function WINS_SetSocketPort