Port Scanner with timeout method.

port_scan.rb

require 'timeout'
require 'socket'

puts "Enter IP Address to Scan:"
ipaddress = gets

1.upto(1024) {|port|
  begin
    timeout(5) do
      TCPSocket.open(ipaddress.chop, port)
    end 
    puts "Response/Port Open: #{port}"
  rescue Timeout::Error
    # uncomment the following line to show closed ports (noisy!)
    #puts "No Response / Port closed: #{port}"
  rescue
    # uncomment the following line to show closed ports (noisy!)
    #puts "No Response / Port closed: #{port}"
  end 
}