Implemented basic nameserver and configured it to run on BeEF startup.

It's worth noting that RubyDNS currently displays a lot of messy
output. This needs to be addressed before moving any further.

extensions/dns/api.rb

@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2006-2013 Wade Alcorn - wade@bindshell.net
+# Browser Exploitation Framework (BeEF) - http://beefproject.com
+# See the file 'doc/COPYING' for copying permission
+#
+module BeEF
+module Extension
+module DNS
+module API
+
+  module NameserverHandler
+
+    BeEF::API::Registrar.instance.register(BeEF::Extension::DNS::API::NameserverHandler,
+                                           BeEF::API::Server,
+                                           'pre_http_start')
+
+    def self.pre_http_start(http_hook_server)
+      config = BeEF::Core::Configuration.instance
+
+      address = config.get('beef.extension.dns.address')
+      port    = config.get('beef.extension.dns.port')
+
+      Thread.new { BeEF::Extension::DNS::DNS.new(address, port) }
+
+      print_info "DNS server: #{address}:#{port}"
+    end
+
+  end
+
+end
+end
+end
+end

extensions/dns/dns.rb

@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2006-2013 Wade Alcorn - wade@bindshell.net
+# Browser Exploitation Framework (BeEF) - http://beefproject.com
+# See the file 'doc/COPYING' for copying permission
+#
+module BeEF
+module Extension
+module DNS
+
+  class DNS
+
+    UPSTREAM = RubyDNS::Resolver.new([[:udp, '8.8.8.8', 53], [:tcp, '8.8.8.8', 53]])
+
+    def initialize(address, port)
+      @address = address
+      @port = port
+
+      run_server
+    end
+
+    def run_server
+      RubyDNS::run_server(:listen => [[:udp, @address, @port]]) do
+        otherwise do |transaction|
+          transaction.passthrough!(UPSTREAM)
+        end
+      end
+    end
+
+  end
+
+end
+end
+end

extensions/dns/extension.rb

@@ -17,3 +17,6 @@ module DNS
 end
 end
 end
+
+require 'extensions/dns/api'
+require 'extensions/dns/dns'