Class: Globetrotter

Inherits:
Object
  • Object
show all
Defined in:
lib/globetrotter.rb,
lib/globetrotter/version.rb

Constant Summary collapse

VERSION = 
"0.0.6"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Globetrotter

Returns a new instance of Globetrotter.



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# File 'lib/globetrotter.rb', line 11

def initialize(options)
  @ns_max_age_minutes = options.ns_max_age_minutes
  @ns_count_to_check = options.ns_count_to_check
  @timeout_seconds = options.timeout_seconds
  @query = options.domain
  @concurrency = options.ns_query_concurrency
  @ns_ips = fetch_ns_ips
end

Class Method Details

.run(options) ⇒ Object 



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# File 'lib/globetrotter.rb', line 65

def self.run(options)
  new(options).run
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/globetrotter.rb', line 20

def run
  ns_count = @ns_ips.count
  @ns_count_to_check = ns_count if @ns_count_to_check > ns_count
  @ns_ips = @ns_ips.sample(@ns_count_to_check)

  message = "Found #{ns_count} nameserver(s). "\
            "Querying #{@ns_count_to_check} of those "\
            "for #{query}, #{@concurrency} at a time, "\
            "with a timeout of #{@timeout_seconds} second(s)."
  $stderr.puts message

  EM.run do
    result_ips = Set.new
    ok = 0
    nok = 0
    EM::Iterator.new(@ns_ips, @concurrency).each(
      proc do |ns_ip, iter|
        resolver = RubyDNS::Resolver.new(
          [[:udp, ns_ip.to_s, 53]],
          timeout: @timeout_seconds
        )
        resolver.query(query) do |response|
          case response
          when RubyDNS::Message
            response.answer.each do |answer|
              address = answer[2].address.to_s
              result_ips.add(address)
            end
            ok += 1
            iter.next
          when RubyDNS::ResolutionFailure
            nok += 1
            iter.next
          end
        end
      end,
      proc do
        EM.stop
        result_ips.each { |ip| puts ip }
        $stderr.puts "#{ok} succeeded, #{nok} failed (#{ok + nok} total)"
      end
    )
  end
end