/*
 * PVVMUD a 3D MUD
 * Copyright (C) 1998-1999  Programvareverkstedet (pvv@pvv.org)
 *
 * 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 "pvvmud.H"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "socket.H"
#include "manager.H"

#include <sys/utsname.h>

// TODO:
//   address and localAddress are not set systematically
//   

CSocketException::CSocketException():CException("Socket exception"){
}

CSocket::CSocket(){

  if((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
    throw new CSocketException();
  }

}

#ifndef socklen_t
#define socklen_t int
#endif

CSocket::CSocket(int fd){
  struct sockaddr_in sin;
  socklen_t addrlen = sizeof(sin);

  this->fd = fd;

  addrlen = sizeof(sin);
  getpeername(fd,(struct sockaddr*)&sin,&addrlen);
  address = CInetAddress(ntohl(sin.sin_addr.s_addr),ntohs(sin.sin_port));

  addrlen = sizeof(sin);
  getsockname(fd,(struct sockaddr*)&sin,&addrlen);
  localAddress = CInetAddress(ntohl(sin.sin_addr.s_addr),ntohs(sin.sin_port));

}

void CSocket::bind( char *addr, int port ) {
  int                opt = 1;             /* For setting reuse_addr    */
  struct sockaddr_in sin;                 /* Address for socket        */
  struct linger      ld;                  /* To set linger option      */

  localPort = port;

  setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt) );
  ld.l_onoff = 0;
  ld.l_linger = 0;
  setsockopt(fd, SOL_SOCKET, SO_LINGER, (char *)&ld, sizeof(ld));

  sin.sin_family = AF_INET;
  sin.sin_port = htons(port);
  sin.sin_addr.s_addr = htonl(INADDR_ANY);

  // Try to bind the address to the socket.
  if(::bind(fd, (struct sockaddr*)&sin, sizeof(sin)) < 0) {
    throw new CSocketException();
  }
  socklen_t length = sizeof(sin);

  getsockname(fd, (struct sockaddr*)&sin, &length);

  if (strcmp(addr,"any")) {
    if (!strcmp(addr,"localhost")) {
      struct  hostent *hptr;
      struct utsname myname;
      
      if (uname(&myname)<0) return;
      if ((hptr=gethostbyname(myname.nodename))==NULL) return;

      sin.sin_addr.s_addr = (*((DWORD*)hptr->h_addr_list[0]));
    } else {
      CInetAddress address(addr);
      sin.sin_addr.s_addr = address.getAddress();
    }
  }

  localAddress.setAddress(ntohl(sin.sin_addr.s_addr),ntohs(sin.sin_port));
}

void CSocket::listen(int number){
  if (::listen(fd,number) < 0)
    throw new CSocketException(); 
}

void CSocket::connect(unsigned long addr, int port){
  struct sockaddr_in sin;

//  address = CInetAddress(addr,port);

  sin.sin_family = AF_INET;
  sin.sin_port = htons(port);
  sin.sin_addr.s_addr = htonl(addr);

  if (::connect(fd, (struct sockaddr*)&sin, sizeof sin ) == -1) {
    cdebug << "ERROR: Connect: " << strerror(errno) << "\n";
    throw new CSocketException();
  }

  socklen_t length = sizeof(sin);
  getpeername(fd,(struct sockaddr*)&sin,&length);
  address = CInetAddress(ntohl(sin.sin_addr.s_addr),ntohs(sin.sin_port));

  length = sizeof(sin);
  getsockname(fd, (struct sockaddr*)&sin, &length);
  localAddress.setAddress(ntohl(sin.sin_addr.s_addr),ntohs(sin.sin_port));

}

CStream * CSocket::getStream(){
  return new CStream(fd);
}

void CSocket::close(){
  ::close(fd);
}

CClientSocket::CClientSocket(unsigned long addr, int port):CSocket(){
  connect(addr,port);
}

CServerSocket::CServerSocket(int port):CSocket(){
  bind("any",port);
  listen(5);
}

CServerSocket::CServerSocket(char *addr, int port):CSocket(){
  bind(addr,port);
  listen(5);
}

CSocket * CServerSocket::accept(){
  int                n_sock;              /* For accepting connection  */
  struct sockaddr_in sin;                 /* Address for socket        */
  socklen_t          len;                 /* For use with accept()     */

  len = sizeof(sin);
  if ((n_sock=::accept(getFileDescriptor(), (struct sockaddr*)&sin, &len)) < 0){
    cdebug << "CServerSocket::accept Error: " << strerror(errno) << "\n";
    throw new CSocketException();
  } else {
    return new CSocket(n_sock);
  }
}

void CSocket::set_fl(int flags) /* flags are file status flags to turn o
n */
{
  int val;
  
  if ((val = fcntl(fd, F_GETFL, 0)) < 0)
    perror("Error Socket: fcntl");

  val |= flags;

  if (fcntl(fd, F_SETFL, val) < 0)
    perror("Error Socket: fcntl");

}

void CSocket::setNonBlocking(){
  set_fl(O_NONBLOCK);
}