A small ruby module for determining if ports are open.

porto.rb

require 'socket'
require 'timeout'

module Porto
	class PortoPort
		def self.in_use?(ip, port)
			begin
				Timeout::timeout(1) do
					begin
						s = TCPSocket.new(ip, port)
						s.close
						return true
					rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
						return false
					end
				end

			rescue Timeout::Error
			end

			return false
		end

		def self.free?(ip, port)
			!self.in_use?(ip, port)
		end
	end

	def self.scan(range, silent = false)
		raise ArgumentError, "`range' argument must be of class Range" unless range.class == Range

		reports = []

		range.each do |port|
			print "." unless silent
			reports << {
				port: port,
				free: (Porto::PortoPort.free? 'localhost', port)
			}
		end

		puts unless silent

		reports
	end
end

Porto::scan((0..25565)).select{|x| !x[:free]}.each do |port|
	puts "Port: #{port[:port]}"
end