Project 1

Goals  Write a simple TCP/IP client that supports a specific protocol  The server is running right now on login.ccs.neu.edu:27993  If your program is correct, the server will send you a secret flag  Turn in your code and the secret flag in order to receive full credit  DUE: September 16, 11:59:59 PM

Your Program  Can be written in whatever language you want  Must compile on the CCIS Linux machines and run on the command line  Don’t use crazy libraries that aren’t installed by default  Don’t write a program with a GUI  If you use an IDE, make sure your code doesn’t have any hidden dependencies

Command Line Syntax $./client [hostname] [NEU ID]  Your client must follow this syntax exactly  Hostname – the name of the server  E.g. login.ccs.neu.edu  Port – Optional parameter, the port the server is listening on  By default, port is  Secure – Optional parameter, indicates that the client should use an SSL encrypted socket  NEU ID – your NEU ID

The Protocol (Part 1)  4 messages  HELLO, STATUS, SOLUTION, and BYE  Your client begins by sending HELLO cs3700fall2015 HELLO [your NEU ID]\n  The server will respond with a STATUS cs3700fall2015 STATUS [an equation]\n  The equation will be a simple math problem  E.g. “5 + 10” or “32 * 509” or “2391 / 93”

The Protocol (Part 2)  Your client returns a SOLUTION message cs3700fall2015 [the solution]\n  The server may respond with another STATUS, or it may respond with BYE cs3700fall2015 BYE [secret flag]\n  The secret flag is what you want :)

Turning In Your Project 1. Register your group  All group members must run the script! 2. Create a directory for your files  All of your (well documented) code  Makefile  README  secret_flags (a file with the secret flags of the group members, one per line) 3. Run the turn-in script

Grading  3% of your total grade  To receive full credit:  Turn in working code that compiles/runs successfully  Turn in the secret flags of all group members  If your code doesn’t compile or doesn’t run, you get zero credit  All code will be scanned by plagiarism detection software

Extra Credit  Possible to get 0.5% extra credit (3.5% total)  Augment your client to support SSL sockets  The protocol is exactly the same, its just encrypted with SSL  If your SSL client is successful, you will get another secret flag  Put these new keys in the secret_flags file  The SSL server is running on the same host, port 27994