dnsserver.go
func (ds *DNSServer) Listen(listenSpec string) error {
	return dns.ListenAndServe(listenSpec, "udp", ds)
}
func (ds *DNSServer) Listen(listenSpec string) error {
	return dns.ListenAndServe(listenSpec, "udp", ds)
}
func ( ds * DNSServer ) Listen ( listenSpec string ) error { return dns . ListenAndServe ( listenSpec , " " , ds ) }
// Listen for DNS requests. listenSpec is a dotted-quad + port, e.g.,
// 127.0.0.1:53. This function blocks and only returns when the DNS service is
// no longer functioning.
Listen for DNS requests . listenSpec is a dotted - quad + port e . g . 127 . 0 . 0 . 1 : 53 . This function blocks and only returns when the DNS service is no longer functioning .