/**************************************************************/
  /*                                                            */
  /*      UNIX 1 / WS 92/93       Gruppe  ux803                 */
  /*      8. Uebung - Aufgabe 4 - socket.c                      */
  /*                                                            */
  /*      Vorname     Name        Matrikelnr.                   */
  /*     ---------   -------     -------------                  */
  /*      Roman       Czyborra      127221                      */
  /*      Torsten     Buller        117894                      */
  /*      Gerasimos   Paliatsaras   140956                      */
  /*                                                            */
  /**************************************************************/

#include "msh.h"
#include <sys/types.h>  /* u_short etc. */
#include <sys/socket.h> /* PF_INET etc. */
#include <netinet/in.h> /* struct sockaddr_in */
#include <netdb.h>      /* struct hostent */

static int sfd; /* socket file descriptor */
static struct sockaddr_in server;
static char myself [18], response [18];

void do_connect() 
{
  if (!sfd)
    {
      struct hostent *kub;     
      kub = gethostbyname ("kubus.cs.tu-berlin.de");
      bcopy (kub->h_addr, &server.sin_addr, kub->h_length);
      server.sin_family = AF_INET;
      server.sin_port=htons(4711);
    }

  sfd = socket (PF_INET, SOCK_STREAM, 0);

  connect(sfd, &server, sizeof(server)) == -1 ? perror ("connect") : 0;
}

static void logme() {
                      do_connect ();
                      write (sfd, myself, 18);
                      read (sfd, response, 18);
                      printf ("%s\n", response);
                      close (sfd);
		    }

void do_login() { myself [0] = '1';
                  strncpy (myself + 1, getlogin(), 8); 
                  strcat (myself, ":");
                  gethostname (myself + strlen (myself), 8);

                  logme ();
                }

void do_logout() { myself [0] = '3';
                   logme ();
                   exit(0);  
                 }

void do_mrwho () { do_connect ();
                   write (sfd, "2", 1);
                   while (read (sfd, response, 18))
                     printf ("%-9s%s\n", strtok (response,":"), strtok(0,""));
                   close (sfd);
                 }

void do_log (struct kommando *kp)
  { 
     if (kp->num_tok1 < 2) return;

     do_connect ();

     if (kp->token_1[1][0] == '0') 
       {
         write (sfd, "2",1);
         read (sfd, response+1, 17);
         close (sfd);

         response[0]='3';
         do_connect();
         write (sfd, response, 18);
       }
     else write (sfd, kp->token_1[1], 18);

     while (read (sfd, response, 18))
        printf ("%s\n", response);
     close (sfd);
}