/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2010-2014 QuakeSpasm developers

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.
*/

#include "q_stdinc.h"
#include "net_sys.h"
#include "q_defs.h"
#include "net_defs.h"

static sys_socket_t net_acceptsocket = INVALID_SOCKET;  // socket for fielding new connections
static sys_socket_t net_controlsocket;
static sys_socket_t net_broadcastsocket = 0;
static struct sockaddr_in broadcastaddr;

static in_addr_t        myAddr;

#include "net_wins.h"

int32_t winsock_initialized = 0;
WSADATA         winsockdata;
#define __wsaerr_static                 /* not static: used by net_wipx.c too */
#include "wsaerror.h"

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

#if !defined(_USE_WINSOCK2)
static double   blocktime;

static INT_PTR PASCAL FAR BlockingHook(void)
{
	MSG     msg;
	BOOL    ret;

	if((Sys_DoubleTime() - blocktime) > 2.0)
	{
		WSACancelBlockingCall();
		return FALSE;
	}

	/* get the next message, if any */
	ret = (BOOL) PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);

	/* if we got one, process it */
	if(ret)
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	/* TRUE if we got a message */
	return ret;
}
#endif  /* ! _USE_WINSOCK2 */


static void WINS_GetLocalAddress(void)
{
	struct hostent  *local = NULL;
	char            buff[MAXHOSTNAMELEN];
	in_addr_t       addr;
	int32_t         err;

	if(myAddr != INADDR_ANY)
		return;

	if(gethostname(buff, MAXHOSTNAMELEN) == SOCKET_ERROR)
	{
		err = SOCKETERRNO;
		Con_SafePrintf("WINS_GetLocalAddress: gethostname failed (%s)\n",
		               socketerror(err));
		return;
	}

	buff[MAXHOSTNAMELEN - 1] = 0;
#if !defined(_USE_WINSOCK2)
	blocktime = Sys_DoubleTime();
	WSASetBlockingHook(BlockingHook);
#endif
	local = gethostbyname(buff);
	err = WSAGetLastError();
#if !defined(_USE_WINSOCK2)
	WSAUnhookBlockingHook();
#endif
	if(local == NULL)
	{
		Con_SafePrintf("WINS_GetLocalAddress: gethostbyname failed (%s)\n",
		               __WSAE_StrError(err));
		return;
	}

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

	addr = ntohl(myAddr);
	sprintf(my_tcpip_address, "%" PRIi64 ".%" PRIi64 ".%" PRIi64 ".%" PRIi64, (addr >> 24) & 0xff, (addr >> 16) & 0xff, (addr >> 8) & 0xff, addr & 0xff);
}


sys_socket_t WINS_Init(void)
{
	int32_t i, err;
	char    buff[MAXHOSTNAMELEN];

	if(COM_CheckParm("-noudp"))
		return -1;

	if(winsock_initialized == 0)
	{
		err = WSAStartup(MAKEWORD(1, 1), &winsockdata);
		if(err != 0)
		{
			Con_SafePrintf("Winsock initialization failed (%s)\n",
			               socketerror(err));
			return INVALID_SOCKET;
		}
	}
	winsock_initialized++;

	// determine my name & address
	if(gethostname(buff, MAXHOSTNAMELEN) != 0)
	{
		err = SOCKETERRNO;
		Con_SafePrintf("WINS_Init: gethostname failed (%s)\n",
		               socketerror(err));
	}
	else
	{
		buff[MAXHOSTNAMELEN - 1] = 0;
	}
	i = COM_CheckParm("-ip");
	if(i)
	{
		if(i < com_argc - 1)
		{
			myAddr = inet_addr(com_argv[i + 1]);
			if(myAddr == INADDR_NONE)
				Sys_Error("%s is not a valid IP address", com_argv[i + 1]);
			strcpy(my_tcpip_address, com_argv[i + 1]);
		}
		else
		{
			Sys_Error("NET_Init: you must specify an IP address after -ip");
		}
	}
	else
	{
		myAddr = INADDR_ANY;
		strcpy(my_tcpip_address, "INADDR_ANY");
	}

	if((net_controlsocket = WINS_OpenSocket(0)) == INVALID_SOCKET)
	{
		Con_SafePrintf("WINS_Init: Unable to open control socket, UDP disabled\n");
		if(--winsock_initialized == 0)
			WSACleanup();
		return INVALID_SOCKET;
	}

	broadcastaddr.sin_family = AF_INET;
	broadcastaddr.sin_addr.s_addr = INADDR_BROADCAST;
	broadcastaddr.sin_port = htons((uint16_t)net_hostport);

	Con_SafePrintf("UDP Initialized\n");
	tcpipAvailable = true;

	return net_controlsocket;
}

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

void WINS_Shutdown(void)
{
	WINS_Listen(false);
	WINS_CloseSocket(net_controlsocket);
	if(--winsock_initialized == 0)
		WSACleanup();
}

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

void WINS_Listen(bool state)
{
	// enable listening
	if(state)
	{
		if(net_acceptsocket != INVALID_SOCKET)
			return;
		WINS_GetLocalAddress();
		if((net_acceptsocket = WINS_OpenSocket(net_hostport)) == INVALID_SOCKET)
			Sys_Error("WINS_Listen: Unable to open accept socket");
		return;
	}

	// disable listening
	if(net_acceptsocket == INVALID_SOCKET)
		return;
	WINS_CloseSocket(net_acceptsocket);
	net_acceptsocket = INVALID_SOCKET;
}

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

sys_socket_t WINS_OpenSocket(int32_t port)
{
	sys_socket_t newsocket;
	struct sockaddr_in address;
	u_long _true = 1;
	int32_t err;

	if((newsocket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET)
	{
		err = SOCKETERRNO;
		Con_SafePrintf("WINS_OpenSocket: %s\n", socketerror(err));
		return INVALID_SOCKET;
	}

	if(ioctlsocket(newsocket, FIONBIO, &_true) == SOCKET_ERROR)
		goto error;

	memset(&address, 0, sizeof(struct sockaddr_in));
	address.sin_family = AF_INET;
	address.sin_addr.s_addr = myAddr;
	address.sin_port = htons((uint16_t)port);
	if(bind(newsocket, (struct sockaddr *)&address, sizeof(address)) == 0)
		return newsocket;

	if(tcpipAvailable)
	{
		err = SOCKETERRNO;
		Sys_Error("Unable to bind to %s (%s)",
		          WINS_AddrToString((struct qsockaddr *) &address),
		          socketerror(err));
		return INVALID_SOCKET;  /* not reached */
	}
	/* else: we are still in init phase, no need to error */

error:
	err = SOCKETERRNO;
	Con_SafePrintf("WINS_OpenSocket: %s\n", socketerror(err));
	closesocket(newsocket);
	return INVALID_SOCKET;
}

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

int32_t WINS_CloseSocket(sys_socket_t socketid)
{
	if(socketid == net_broadcastsocket)
		net_broadcastsocket = 0;
	return closesocket(socketid);
}

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

/*
============
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 int32_t PartialIPAddress(const char *in, struct qsockaddr *hostaddr)
{
	char    buff[256];
	char    *b;
	int32_t addr, mask, num, port, run;

	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 = atoi(b);
	else
		port = net_hostport;

	hostaddr->qsa_family = AF_INET;
	((struct sockaddr_in *)hostaddr)->sin_port = htons((uint16_t)port);
	((struct sockaddr_in *)hostaddr)->sin_addr.s_addr =
	        (myAddr & htonl(mask)) | htonl(addr);

	return 0;
}

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

int32_t WINS_Connect(sys_socket_t socketid, struct qsockaddr *addr)
{
	return 0;
}

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

sys_socket_t WINS_CheckNewConnections(void)
{
	char            buf[4096];

	if(net_acceptsocket == INVALID_SOCKET)
		return INVALID_SOCKET;

	if(recvfrom(net_acceptsocket, buf, sizeof(buf), MSG_PEEK, NULL, NULL)
	                != SOCKET_ERROR)
	{
		return net_acceptsocket;
	}
	return INVALID_SOCKET;
}

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

int32_t WINS_Read(sys_socket_t socketid, byte *buf, int32_t len, struct qsockaddr *addr)
{
	socklen_t addrlen = sizeof(struct qsockaddr);
	int32_t ret;

	ret = recvfrom(socketid, (char *)buf, len, 0, (struct sockaddr *)addr, &addrlen);
	if(ret == SOCKET_ERROR)
	{
		int32_t err = SOCKETERRNO;
		if(err == NET_EWOULDBLOCK || err == NET_ECONNREFUSED)
			return 0;
		Con_SafePrintf("WINS_Read, recvfrom: %s\n", socketerror(err));
	}
	return ret;
}

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

static int32_t WINS_MakeSocketBroadcastCapable(sys_socket_t socketid)
{
	int32_t i = 1;

	// make this socket broadcast capable
	if(setsockopt(socketid, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i))
	                == SOCKET_ERROR)
	{
		int32_t err = SOCKETERRNO;
		Con_SafePrintf("UDP, setsockopt: %s\n", socketerror(err));
		return -1;
	}
	net_broadcastsocket = socketid;

	return 0;
}

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

int32_t WINS_Broadcast(sys_socket_t socketid, byte *buf, int32_t len)
{
	int32_t ret;

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

	return WINS_Write(socketid, buf, len, (struct qsockaddr *)&broadcastaddr);
}

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

int32_t WINS_Write(sys_socket_t socketid, byte *buf, int32_t len, struct qsockaddr *addr)
{
	int32_t ret;

	ret = sendto(socketid, (char *)buf, len, 0, (struct sockaddr *)addr,
	             sizeof(struct qsockaddr));
	if(ret == SOCKET_ERROR)
	{
		int32_t err = SOCKETERRNO;
		if(err == NET_EWOULDBLOCK)
			return 0;
		Con_SafePrintf("WINS_Write, sendto: %s\n", socketerror(err));
	}
	return ret;
}

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

const char *WINS_AddrToString(struct qsockaddr *addr)
{
	static char buffer[22];
	int32_t         haddr;

	haddr = ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr);
	sprintf(buffer, "%" PRIi32 ".%" PRIi32 ".%" PRIi32 ".%" PRIi32 ":%" PRIi32, (haddr >> 24) & 0xff,
	        (haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff,
	        ntohs(((struct sockaddr_in *)addr)->sin_port));
	return buffer;
}

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

int32_t WINS_StringToAddr(const char *string, struct qsockaddr *addr)
{
	int32_t ha1, ha2, ha3, ha4, hp, ipaddr;

	sscanf(string, "%" PRIi32 ".%" PRIi32 ".%" PRIi32 ".%" PRIi32 ":%" PRIi32, &ha1, &ha2, &ha3, &ha4, &hp);
	ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4;

	addr->qsa_family = AF_INET;
	((struct sockaddr_in *)addr)->sin_addr.s_addr = htonl(ipaddr);
	((struct sockaddr_in *)addr)->sin_port = htons((uint16_t)hp);
	return 0;
}

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

int32_t WINS_GetSocketAddr(sys_socket_t socketid, struct qsockaddr *addr)
{
	socklen_t addrlen = sizeof(struct qsockaddr);
	in_addr_t a;

	memset(addr, 0, sizeof(struct qsockaddr));
	getsockname(socketid, (struct sockaddr *)addr, &addrlen);

	a = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
	if(a == 0 || a == htonl(INADDR_LOOPBACK))
		((struct sockaddr_in *)addr)->sin_addr.s_addr = myAddr;

	return 0;
}

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

int32_t WINS_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)
	{
		strncpy(name, (char *)hostentry->h_name, NET_NAMELEN - 1);
		return 0;
	}

	strcpy(name, WINS_AddrToString(addr));
	return 0;
}

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

int32_t WINS_GetAddrFromName(const 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->qsa_family = AF_INET;
	((struct sockaddr_in *)addr)->sin_port = htons((uint16_t)net_hostport);
	((struct sockaddr_in *)addr)->sin_addr.s_addr =
	        *(in_addr_t *)hostentry->h_addr_list[0];

	return 0;
}

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

int32_t WINS_AddrCompare(struct qsockaddr *addr1, struct qsockaddr *addr2)
{
	if(addr1->qsa_family != addr2->qsa_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;
}

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

int32_t WINS_GetSocketPort(struct qsockaddr *addr)
{
	return ntohs(((struct sockaddr_in *)addr)->sin_port);
}


int32_t WINS_SetSocketPort(struct qsockaddr *addr, int32_t port)
{
	((struct sockaddr_in *)addr)->sin_port = htons((uint16_t)port);
	return 0;
}

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