Endlessh is an SSH tarpit that very slowly sends an endless, random SSH banner.
It keeps SSH clients locked up for hours or even days at at time. The purpose
is to put your real SSH server on another port and then let the script kiddies
get stuck in this tarpit instead of bothering a real server.

Since the tarpit is in the banner before any cryptographic exchange occurs,this
program doesn't depend on any cryptographic libraries. It's a simple,
single-threaded, standalone C program. It uses poll() to trap multiple clients
at a time.