dotlistener.go

package rdns

import (
	"crypto/tls"

	"github.com/miekg/dns"
)

// DoTListener is a DNS listener/server for DNS-over-TLS.
type DoTListener struct {
	*dns.Server
	id string
}

var _ Listener = &DoTListener{}

// DoTListenerOptions contains options used by the DNS-over-TLS server.
type DoTListenerOptions struct {
	ListenOptions

	TLSConfig *tls.Config
}

// NewDoTListener returns an instance of a DNS-over-TLS listener.
func NewDoTListener(id, addr, network string, opt DoTListenerOptions, resolver Resolver) *DoTListener {
	if network == "" {
		network = "tcp-tls"
	}
	return &DoTListener{
		id: id,
		Server: &dns.Server{
			Addr:      addr,
			Net:       network,
			TLSConfig: opt.TLSConfig,
			Handler:   listenHandler(id, "dot", addr, resolver, opt.AllowedNet),
		},
	}
}

// Start the Dot server.
func (s DoTListener) Start() error {
	Log.Info("starting listener",
		"id", s.id,
		"protocol", "dot",
		"addr", s.Addr)
	return s.ListenAndServe()
}

// Stop the server.
func (s DoTListener) Stop() error {
	Log.Info("stopping listener",
		"id", s.id,
		"protocol", "dot",
		"addr", s.Addr)
	return s.Shutdown()
}

func (s DoTListener) String() string {
	return s.id
}