Submit your code by using my upload utility, onto "UPLOAD ASSIGNMENT 1" area.
FOLLOW THE NAMING CONVENTION.
PLEASE READ THE ENTIRE ASSIGNMENT (THIS PAGE) VERY CAREFULLY.
UPDATES TO THIS ASSIGNMENT WILL POSTED ON "MESSAGE OF THE DAY" PAGE.

BACKGROUND:
In order to establish a telnet connection to a UNIX system, there must be two components working together, telnet server and telnet client. Telnet server runs as a daemon (usually) on one system and telnet client runs as an application on another machine. Telnet server by default listens on TCP port 23 and of course the client by default connects to that port of the server, you could specify the client to connect to different port if the telnet server is listening on the different port, e.g. "telnet myserver 2000" which tells the telnet client to connect to port 2000 on a system called myserver. Ones telnet connection is established and user is authenticated, then user can enter any command on the remote system.

DESCRIPTION:
Write a telnet server using SOCKET for IPC to implement UNIX like "telnetd" server, your program should only comply with my specification rather than the real UNIX telnetd server.

SERVER PROGRAM:
The server should run in the foreground of the system on a none privilege port, (above 1024), the client will be invoked, to communicate with the server. Unlike the actual UNIX telnet server, each instance of a server will only connect to ONE client at a time and also the user can invoke only the commands that are allowed by the server, such as date, who, ls, finger, etc...
Server should accept a port number to listen to.
 

CLIENT PROGRAM:
You can use the telnet client which is already included with any OS.

The following is the sequence of events that should happen:

1. Start the server in the background
    afs23% Telnetserver 1234
.....
....
Client connected from afs12.njit.edu IP address: 128.235.204.73 at: Wed Feb 21 17:07:10 EST 2001

2. Run the client : e.g.

    afs12% telnet afs23 1234
    Welcome to My telnet server.
     Enter your command or help for list of commands: help
        list of commands: date, pwd, who, ls, quit.
     Enter your command or help for list of commands:  pwd
       /export/home/vahid/cis604/socket
     Enter your command or help for list of commands:  quit

Good bye.
     afs12%
 

Conditions:

• You should try to minimize any dependencies your code has for running on specific machines.
• I will compile all programs on Solaris 7 using gcc as my C or C++ compiler.
• You can use any UNIX shell script such as: sh, csh, tcl, perl,....

• Two files: fname_lname.des AND fname_lname.c, ".c" is only an example, you extension could be .C, .cc, .java,.pl...
• If your assignment contains more than one file, then submit ONE tar file for your assignment.
• Your tar file should contain all the files that you created for your assignment, you should also include a TEXT file (not wordprocessor) with extension of ".des" (e.g. fname_lname.des) which contains a short description of how your program works and how should I compile and test your code. At the end of the "des" file, a section called "BUG:" should be added which follows all the known bugs in your program(s). E.g.

• If your program does not have a "known" bug, just leave BUG: section empty.

EXTRA CREDIT:  The following is optional not required.
If you do any of the extra credit, you must mention it in the above "des" file.

• Make the server multi-session multi-user.
• Make the server as close as you can to the real UNIX telnetd.

Please direct questions or errors to: CIS432@cis.njit.edu