/*  Author:
    CS4153/CS6153 - Fall 2000
    Purpose:
*/

#include <stdio.h>
#include <stdlib.h>


#ifdef WIN32
/* for Windows */
#include <winsock2.h>
#else
/* for UNIX */
#include <sys/socket.h>
#include <netdb.h>
/* for UNIX */
#define IPPROTO_IP           0
#define SOCKET_ERROR         -1
#define INADDR_NONE          0xffffffff
#endif

#define DAYTIME_PORT          13  /* port number for daytime server */

int main(int argc, char *argv[])
{
  unsigned long       ulAddrIP;
  struct              hostent *pHostEnt;
  struct sockaddr_in  SockAddrRead;
  int                 iSock;
  char                szBuffer[1024];

#ifdef WIN32
  /* for Windows */
  WORD                wVersionRequested;
  WSADATA             wsaData;

  /* setup windows sockets */
  wVersionRequested = MAKEWORD( 1, 1 ); 
  if(WSAStartup(wVersionRequested, &wsaData ) != 0)
  {
    printf("Error initlializing Windows sockets\n");
    return -1;
  }
#else
/* UNIX sockets do not need to be setup like WinSock */
#endif

  if (argc < 2) /* check for host address */
  {
    printf("Usage: DayTime <address>\n");
    return -1;
  }

  /* initialize host socket address */
  memset(&(SockAddrRead), '\0', sizeof(SockAddrRead));
  SockAddrRead.sin_port = htons(???);  /* port setting */
  SockAddrRead.sin_family = ???;            /* Internet addressing */

  ulAddrIP = inet_addr(???);    /* see if host's dotted address is specified */
  if (ulAddrIP == INADDR_NONE)
  {
    /* host's address is a name */
    pHostEnt = gethostbyname(???); /* use DNS to get dotted address */
    if (pHostEnt == NULL)
    {
      printf("Error resolving host name: %s\n", argv[1]);
      return -1;
    }

    /* set binary address */
    memcpy(&(SockAddrRead.sin_addr), pHostEnt->h_addr, pHostEnt->h_length);
  }
  else
  {
    /* set binary address */
    memcpy(&(SockAddrRead.sin_addr), &ulAddrIP, sizeof(SockAddrRead.sin_addr));
  }

  /* create an unbound stream (TCP) socket */
  iSock = socket(???, ???, IPPROTO_IP);
  if (iSock == SOCKET_ERROR)
  {
    printf("Error opening socket.\n");
    return -1;
  }

  /* Establish connection using socket and host address */
  if (connect(???, (struct sockaddr*)&SockAddrRead, 
              sizeof(SockAddrRead)) == SOCKET_ERROR)
  {
    printf("Connection error.\n");
    return -1;
  }

  /* obtain and write the local host name and bound socket's port number. */


  /* clear receive buffer */
  memset(szBuffer, '\0', sizeof(szBuffer));
  
  /* receive data over socket */
  if (recv(???, ???, ???, 0) == SOCKET_ERROR)
  {
    printf("Receive error.\n");
    return -1;
  }

  printf("DayTime server on %s returns %s\n", argv[1], szBuffer);

#ifdef WIN32
  /* for Windows only */
  closesocket(iSock); /* close the socket */
  WSACleanup();       /* cleanup WInSock */
#else
  /* for UNIX */
  close(iSock);       /* close the socket */
  /* UNIX sockets do not need to be cleanedup like WinSock */
#endif

  return 0;
}