Directions
The purpose of this assignment is to dust off some of your C skills and get exposure to the types of things you do in network programming working with raw buffers and manipulating them using PDUs and Packet structures. You will also get the chance to play with wireshark to create your own test cases, but before you do this, you should implement this code with the samples that I already provided.
I have provided a makefile for you. make build compiles your program and creates an executable called decoder. Running make run will run your program.
See the homework supplement I provided on blackboard for some more information and background.
What to Hand In
This assignment only requires you to modify code in decoder.c. All of the network structures are in packet.h make sure you understand them. To make things easier for you to convert buffered data to formatted strings for things like IP and MAC addresses, I have provided helpers in nethelper.c. Again, please only modify decoder.c.
When you are ready to submit, you can create a zip file of your entire directory and submit on blackboard. AKA in other words everything required so that the grader only has to execute make build && make run. to compile, link, and execute your program. Alternatively, you can create a git repo on GitHub with a public repository and provide a link to this repo as your blackboard submission. If you dont want this code public, but want to use a git environment you can also push to a private Drexel CCI GitLab repo and provide that link as your blackboard submission.
Warnings, dont let this be you...
This is a REALY EASY assignment if you are comfortable with C. My solution is about 40 lines of code for ALL of the things you need to accomplish. If you need to refresh your C knowledge, PLEASE DONT WAIT UNTIL THE LAST MINUTE. This assignment is setting the foundation for typical network programming tasks which involve creating and manipulating structures, working with buffers, pointers, etc.
I also put a TON of documentation in the code to help you. To make things easier on the grader, please thin out the documentation in your submission, removing mine and putting in documentation relevant to your specific implementation.
