# frozen_string_literal: true

require_relative "test"

# from https://gist.github.com/peterc/1425383

class DNSErrorServer < TestDNSResolver
  private

  def dns_response(query)
    # Valid response header
    response = "#{query[0, 2]}\x81\x02#{query[4, 2]}\x00\x00\x00\x00\x00\x00".b

    # Append original question section
    response << query[12..-1].b

    # Use pointer to refer to domain name in question section
    response << "\xc0\x0c".b

    response
  end
end