Merge pull request #32 from zsprackett/master

Add support for passing in sockets

Author: ioquatix

lib/rubydns/server.rb

@@ -122,11 +122,29 @@ def run(options = {})
 
 # Setup server sockets
 interfaces.each do |spec|
-@logger.info "Listening on #{spec.join(':')}"
-if spec[0] == :udp
-EventMachine.open_datagram_socket(spec[1], spec[2], UDPHandler, self)
-elsif spec[0] == :tcp
-EventMachine.start_server(spec[1], spec[2], TCPHandler, self)
+if spec.is_a?(BasicSocket)
+spec.do_not_reverse_lookup
+optval = spec.getsockopt(Socket::SOL_SOCKET, Socket::SO_TYPE)
+protocol = optval.unpack("i")[0]
+ip = spec.local_address.ip_address
+port = spec.local_address.ip_port
+case protocol
+when Socket::SOCK_DGRAM
+@logger.info "Attaching to pre-existing UDP socket #{ip}:#{port}"
+EventMachine.attach(spec, UDPHandler, self)
+when Socket::SOCK_STREAM
+@logger.info "Attaching to pre-existing TCP socket #{ip}:#{port}"
+EventMachine.attach(spec, TCPHandler, self)
+else
+@logger.error "Ignoring unknown socket protocol: #{protocol}"
+end
+else
+@logger.info "Listening on #{spec.join(':')}"
+if spec[0] == :udp
+EventMachine.open_datagram_socket(spec[1], spec[2], UDPHandler, self)
+elsif spec[0] == :tcp
+EventMachine.start_server(spec[1], spec[2], TCPHandler, self)
+end
 end
 end