Package knock

A port-knocking server/client

This is a port-knocking server/client. Port-knocking is a method where a
server can sniff one of its interfaces for a special "knock" sequence of
port-hits. When detected, it will run a specified event bound to that port
knock sequence. These port-hits need not be on open ports, since we use
libpcap to sniff the raw interface traffic. This package contains the
knock client.

General Commands (Section 1)
knock is a port-knock client. It sends TCP/UDP packets to each specified port on host, creating a special knock sequence on the listening server (see the knockd...