Simply ruby port knocker

knockr.rb

#!/usr/bin/env ruby

require 'socket'
require 'timeout'

def knock?(ip, port)
  begin
    Timeout::timeout(2) do
      begin
        s = TCPSocket.new(ip, port)
        s.close
      rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
		
      end
    end
  rescue Timeout::Error

  end

end

host = ARGV.shift
puts "Knocking #{host} ports #{ARGV.join(' ')}"
ARGV.each do|a|
  knock?( host, a )
  sleep 1
end