      def proxy(client, mongo)
        incoming_message = client.read(16)
        length, op_code = incoming_message.unpack("l<x8l<")
        incoming_message << client.read(length - 16)

        if op_code == OP_QUERY && ismaster_command?(incoming_message)
          # Intercept the ismaster command and send our own reply.
          client.write status_reply
        else
          # This is a normal command, so proxy it to the real mongo instance.
          mongo.write incoming_message

          if op_code == OP_QUERY || op_code == OP_GETMORE
            outgoing_message = mongo.read(4)
            length, = outgoing_message.unpack('l<')
            outgoing_message << mongo.read(length - 4)

            client.write outgoing_message
          end
        end
      end
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.