ruby用socket扫描端口

require 'socket'
include Socket::Constants

def scan_port
  if $*[0] == nil or $*[1] == nil or $*[2] == nil
    abort "用法示例：ruby #$0 ip地址 开始端口　结束端口 EX:如ruby #$0 localhost 1 1024"
  end
  time = Time.now
  scan $*[0], $*[1], $*[2]
  puts "\n共耗时：#{Time.now - time}秒"
end

private
def scan(address, start_port, end_port)
  threads = []
  for port in start_port..end_port
    threads << Thread.new(port) do |theport|
      begin
        socket = Socket.new(AF_INET, SOCK_STREAM, 0) #生成新的套接字
        sockaddr = Socket.pack_sockaddr_in(theport, address)
        socket.connect(sockaddr)
        puts "Port:#{theport} is Opend!\n"
        socket.close
      rescue
      end
    end
  end
  threads.each {|thr| thr.join}
end