#!/usr/bin/env ruby
require 'rubydns'
require_relative 'ad_functions'

INTERFACES = [
    [:udp, "0.0.0.0", 53],
    [:tcp, "0.0.0.0", 53]
]
Name = Resolv::DNS::Name
IN = Resolv::DNS::Resource::IN

# Use upstream DNS for name resolution.
UPSTREAM = RubyDNS::Resolver.new([[:udp, "8.8.8.8", 53], [:tcp, "8.8.8.8", 53]])

def self.run
    # Start the RubyDNS server
    RubyDNS::run_server(:listen => INTERFACES) do
        $adservers_array.each do |adserver|
          match(adserver, IN::A) do |transaction|
            transaction.respond!("0.0.0.0")
          end
        end

        # Default DNS handler
        otherwise do |transaction|
            transaction.passthrough!(UPSTREAM)
        end
    end
end
run