Cut off clients that keep sending 'commands' which simply don't exist

Purely to prevent any security or bandwidth issues. You know, some people
might do something like 'cat /dev/urandom | nc host ip'. It actually ran
fine with that, but you'll likely run into bandwidth issues because of that
crap when you don't have a lot of bandwidth. In theory it could also eat up
your memory. I still have a theory that it actually still can do that.

Signed-off-by: Toon Schoenmakers <nighteyes1993@gmail.com>