It's surprisingly good code for a student hobby project. I dipped in earlier hoping to find some silly gotcha to preen about, but it's well structured, follows a close read of the RFCs, and for its problem domain it probably needs to be in C anyways. I agree, the author shouldn't sell themselves short if they don't want to. But I also kind of took the "what's the license" question as a bit snippy, which I assume that preceding commenter did too.