Fix for busybox

[anydoby]

The original version did not work for me on busybox linux. This one does.

[benrady]

Unfortunately, using the -p option when listening causes an error with OpenBSD netcat, which is what we've been trying to target up until now. I would the semantics for that option are different for the netcat on busybox.

Any chance you could turn this into an issue so that others can find it?

[anydoby]

Don't know exactly how to do it, but I think people will find it, it's still in my fork.

[benrady]

Sounds good. Thanks!