/*
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_udp.c

#include "quakedef.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <errno.h>

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

#ifdef NeXT
#include <libc.h>
#endif

extern int gethostname (char *, int);
extern int close (int);

extern cvar_t hostname;

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;

#include "net_udp.h"

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

int UDP_Init (void)
{
  struct hostent *local;
  char  buff[MAXHOSTNAMELEN];
  struct qsockaddr addr;
  char *colon;
  
  if (COM_CheckParm ("-noudp"))
    return -1;

  // determine my name & address
  gethostname(buff, MAXHOSTNAMELEN);
  local = gethostbyname(buff);
  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)
  {
    buff[15] = 0;
    Cvar_Set ("hostname", buff);
  }

  if ((net_controlsocket = UDP_OpenSocket (0)) == -1)
    Sys_Error("UDP_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);

  UDP_GetSocketAddr (net_controlsocket, &addr);
  Q_strcpy(my_tcpip_address,  UDP_AddrToString (&addr));
  colon = Q_strrchr (my_tcpip_address, ':');
  if (colon)
    *colon = 0;

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

  return net_controlsocket;
}

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

void UDP_Shutdown (void)
{
  UDP_Listen (false);
  UDP_CloseSocket (net_controlsocket);
}

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

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

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

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

int UDP_OpenSocket (int port)
{
  int newsocket;
  struct sockaddr_in address;
  qboolean _true = true;

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

  if (ioctl (newsocket, FIONBIO, (char *)&_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:
  close (newsocket);
  return -1;
}

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

int UDP_CloseSocket (int socket)
{
  if (socket == net_broadcastsocket)
    net_broadcastsocket = 0;
  return close (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 UDP_Connect (int socket, struct qsockaddr *addr)
{
  return 0;
}

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

int UDP_CheckNewConnections (void)
{
  unsigned long available;

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

  if (ioctl (net_acceptsocket, FIONREAD, &available) == -1)
    Sys_Error ("UDP: ioctlsocket (FIONREAD) failed\n");
  if (available)
    return net_acceptsocket;
  return -1;
}

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

int UDP_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 && (errno == EWOULDBLOCK || errno == ECONNREFUSED))
    return 0;
  return ret;
}

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

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

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

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

int UDP_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 && errno == EWOULDBLOCK)
    return 0;
  return ret;
}

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

char *UDP_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 UDP_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 UDP_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 UDP_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, UDP_AddrToString (addr));
  return 0;
}

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

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


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

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