dnsserver.go
func (ds *DNSServer) qualifySrv(service, protocol string) string {
	return fmt.Sprintf("_%s._%s.%s", service, protocol, ds.Domain)
}
func (ds *DNSServer) qualifySrv(service, protocol string) string {
	return fmt.Sprintf("_%s._%s.%s", service, protocol, ds.Domain)
}
// Convenience function to ensure that SRV names are well-formed.