/*
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_wins.c

#include "quakedef.h"
#include "winquake.h"

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 struct qsockaddr broadcastaddr;

static unsigned long myAddr;

qboolean  winsock_lib_initialized;

int (PASCAL FAR *pWSAStartup)(WORD wVersionRequired, LPWSADATA lpWSAData);
int (PASCAL FAR *pWSACleanup)(void);
int (PASCAL FAR *pWSAGetLastError)(void);
SOCKET (PASCAL FAR *psocket)(int af, int type, int protocol);
int (PASCAL FAR *pioctlsocket)(SOCKET s, long cmd, u_long FAR *argp);
int (PASCAL FAR *psetsockopt)(SOCKET s, int level, int optname,
                const char FAR * optval, int optlen);
int (PASCAL FAR *precvfrom)(SOCKET s, char FAR * buf, int len, int flags,
              struct sockaddr FAR *from, int FAR * fromlen);
int (PASCAL FAR *psendto)(SOCKET s, const char FAR * buf, int len, int flags,
              const struct sockaddr FAR *to, int tolen);
int (PASCAL FAR *pclosesocket)(SOCKET s);
int (PASCAL FAR *pgethostname)(char FAR * name, int namelen);
struct hostent FAR * (PASCAL FAR *pgethostbyname)(const char FAR * name);
struct hostent FAR * (PASCAL FAR *pgethostbyaddr)(const char FAR * addr,
                          int len, int type);
int (PASCAL FAR *pgetsockname)(SOCKET s, struct sockaddr FAR *name,
                 int FAR * namelen);

#include "net_wins.h"

int winsock_initialized = 0;
WSADATA   winsockdata;

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

static double blocktime;

BOOL PASCAL FAR BlockingHook(void)  
{ 
    MSG   msg;
    BOOL  ret;
 
  if ((Sys_FloatTime() - 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; 
} 


void WINS_GetLocalAddress()
{
  struct hostent  *local = NULL;
  char      buff[MAXHOSTNAMELEN];
  unsigned long addr;

  if (myAddr != INADDR_ANY)
    return;

  if (pgethostname(buff, MAXHOSTNAMELEN) == SOCKET_ERROR)
    return;

  blocktime = Sys_FloatTime();
  WSASetBlockingHook(BlockingHook);
  local = pgethostbyname(buff);
  WSAUnhookBlockingHook();
  if (local == NULL)
    return;

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

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


int WINS_Init (void)
{
  int   i;
  char  buff[MAXHOSTNAMELEN];
  char  *p;
  int   r;
  WORD  wVersionRequested;
  HINSTANCE hInst;

// initialize the Winsock function vectors (we do this instead of statically linking
// so we can run on Win 3.1, where there isn't necessarily Winsock)
    hInst = LoadLibrary("wsock32.dll");
  
  if (hInst == NULL)
  {
    Con_SafePrintf ("Failed to load winsock.dll\n");
    winsock_lib_initialized = false;
    return -1;
  }

  winsock_lib_initialized = true;

    pWSAStartup = (void *)GetProcAddress(hInst, "WSAStartup");
    pWSACleanup = (void *)GetProcAddress(hInst, "WSACleanup");
    pWSAGetLastError = (void *)GetProcAddress(hInst, "WSAGetLastError");
    psocket = (void *)GetProcAddress(hInst, "socket");
    pioctlsocket = (void *)GetProcAddress(hInst, "ioctlsocket");
    psetsockopt = (void *)GetProcAddress(hInst, "setsockopt");
    precvfrom = (void *)GetProcAddress(hInst, "recvfrom");
    psendto = (void *)GetProcAddress(hInst, "sendto");
    pclosesocket = (void *)GetProcAddress(hInst, "closesocket");
    pgethostname = (void *)GetProcAddress(hInst, "gethostname");
    pgethostbyname = (void *)GetProcAddress(hInst, "gethostbyname");
    pgethostbyaddr = (void *)GetProcAddress(hInst, "gethostbyaddr");
    pgetsockname = (void *)GetProcAddress(hInst, "getsockname");

    if (!pWSAStartup || !pWSACleanup || !pWSAGetLastError ||
    !psocket || !pioctlsocket || !psetsockopt ||
    !precvfrom || !psendto || !pclosesocket ||
    !pgethostname || !pgethostbyname || !pgethostbyaddr ||
    !pgetsockname)
  {
    Con_SafePrintf ("Couldn't GetProcAddress from winsock.dll\n");
    return -1;
  }

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

  if (winsock_initialized == 0)
  {
    wVersionRequested = MAKEWORD(1, 1); 

    r = pWSAStartup (MAKEWORD(1, 1), &winsockdata);

    if (r)
    {
      Con_SafePrintf ("Winsock initialization failed.\n");
      return -1;
    }
  }
  winsock_initialized++;

  // determine my name
  if (pgethostname(buff, MAXHOSTNAMELEN) == SOCKET_ERROR)
  {
    Con_DPrintf ("Winsock TCP/IP Initialization failed.\n");
    if (--winsock_initialized == 0)
      pWSACleanup ();
    return -1;
  }

  // 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);
  }

  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)) == -1)
  {
    Con_Printf("WINS_Init: Unable to open control socket\n");
    if (--winsock_initialized == 0)
      pWSACleanup ();
    return -1;
  }

  ((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((unsigned short)net_hostport);

  Con_Printf("Winsock TCP/IP Initialized\n");
  tcpipAvailable = true;

  return net_controlsocket;
}

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

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

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

void WINS_Listen (qboolean state)
{
  // enable listening
  if (state)
  {
    if (net_acceptsocket != -1)
      return;
    WINS_GetLocalAddress();
    if ((net_acceptsocket = WINS_OpenSocket (net_hostport)) == -1)
      Sys_Error ("WINS_Listen: Unable to open accept socket\n");
    return;
  }

  // disable listening
  if (net_acceptsocket == -1)
    return;
  WINS_CloseSocket (net_acceptsocket);
  net_acceptsocket = -1;
}

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

int WINS_OpenSocket (int port)
{
  int newsocket;
  struct sockaddr_in address;
  u_long _true = 1;

  if ((newsocket = psocket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
    return -1;

  if (pioctlsocket (newsocket, FIONBIO, &_true) == -1)
    goto ErrorReturn;

  address.sin_family = AF_INET;
  address.sin_addr.s_addr = myAddr;
  address.sin_port = htons((unsigned short)port);
  if( bind (newsocket, (void *)&address, sizeof(address)) == 0)
    return newsocket;

  Sys_Error ("Unable to bind to %s", WINS_AddrToString((struct qsockaddr *)&address));
ErrorReturn:
  pclosesocket (newsocket);
  return -1;
}

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

int WINS_CloseSocket (int socket)
{
  if (socket == net_broadcastsocket)
    net_broadcastsocket = 0;
  return pclosesocket (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 WINS_Connect (int socket, struct qsockaddr *addr)
{
  return 0;
}

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

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

  if (net_acceptsocket == -1)
    return -1;

  if (precvfrom (net_acceptsocket, buf, sizeof(buf), MSG_PEEK, NULL, NULL) > 0)
  {
    return net_acceptsocket;
  }
  return -1;
}

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

int WINS_Read (int socket, byte *buf, int len, struct qsockaddr *addr)
{
  int addrlen = sizeof (struct qsockaddr);
  int ret;

  ret = precvfrom (socket, buf, len, 0, (struct sockaddr *)addr, &addrlen);
  if (ret == -1)
  {
    int errno = pWSAGetLastError();

    if (errno == WSAEWOULDBLOCK || errno == WSAECONNREFUSED)
      return 0;

  }
  return ret;
}

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

int WINS_MakeSocketBroadcastCapable (int socket)
{
  int i = 1;

  // make this socket broadcast capable
  if (psetsockopt(socket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) < 0)
    return -1;
  net_broadcastsocket = socket;

  return 0;
}

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

int WINS_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");
    WINS_GetLocalAddress();
    ret = WINS_MakeSocketBroadcastCapable (socket);
    if (ret == -1)
    {
      Con_Printf("Unable to make socket broadcast capable\n");
      return ret;
    }
  }

  return WINS_Write (socket, buf, len, &broadcastaddr);
}

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

int WINS_Write (int socket, byte *buf, int len, struct qsockaddr *addr)
{
  int ret;

  ret = psendto (socket, buf, len, 0, (struct sockaddr *)addr, sizeof(struct qsockaddr));
  if (ret == -1)
    if (pWSAGetLastError() == WSAEWOULDBLOCK)
      return 0;

  return ret;
}

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

char *WINS_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 WINS_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((unsigned short)hp);
  return 0;
}

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

int WINS_GetSocketAddr (int socket, struct qsockaddr *addr)
{
  int addrlen = sizeof(struct qsockaddr);
  unsigned int a;

  Q_memset(addr, 0, sizeof(struct qsockaddr));
  pgetsockname(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 WINS_GetNameFromAddr (struct qsockaddr *addr, char *name)
{
  struct hostent *hostentry;

  hostentry = pgethostbyaddr ((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, WINS_AddrToString (addr));
  return 0;
}

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

int WINS_GetAddrFromName(char *name, struct qsockaddr *addr)
{
  struct hostent *hostentry;

  if (name[0] >= '0' && name[0] <= '9')
    return PartialIPAddress (name, addr);
  
  hostentry = pgethostbyname (name);
  if (!hostentry)
    return -1;

  addr->sa_family = AF_INET;
  ((struct sockaddr_in *)addr)->sin_port = htons((unsigned short)net_hostport); 
  ((struct sockaddr_in *)addr)->sin_addr.s_addr = *(int *)hostentry->h_addr_list[0];

  return 0;
}

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

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


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

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