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package dnsserver
import (
"context"
"crypto/tls"
"fmt"
"net"
"github.com/miekg/dns"
)
// serverTLS represents an instance of a TLS-over-DNS-server.
type serverTLS struct {
*Server
}
// NewServerTLS returns a new CoreDNS TLS server and compiles all middleware in to it.
func NewServerTLS(addr string, group []*Config) (*serverTLS, error) {
s, err := NewServer(addr, group)
if err != nil {
return nil, err
}
return &serverTLS{Server: s}, nil
}
// Serve implements caddy.TCPServer interface.
func (s *serverTLS) Serve(l net.Listener) error {
s.m.Lock()
// Only fill out the TCP server for this one.
s.server[tcp] = &dns.Server{Listener: l, Net: "tcp-tls", Handler: dns.HandlerFunc(func(w dns.ResponseWriter, r *dns.Msg) {
ctx := context.Background()
s.ServeDNS(ctx, w, r)
})}
s.m.Unlock()
return s.server[tcp].ActivateAndServe()
}
// ServePacket implements caddy.UDPServer interface.
func (s *serverTLS) ServePacket(p net.PacketConn) error { return nil }
// Listen implements caddy.TCPServer interface.
func (s *serverTLS) Listen() (net.Listener, error) {
// The *tls* middleware must make sure that multiple conflicting
// TLS configuration return an error: it can only be specified once.
tlsConfig := new(tls.Config)
for _, conf := range s.zones {
// Should we error if some configs *don't* have TLS?
tlsConfig = conf.TLSConfig
}
var (
l net.Listener
err error
)
if tlsConfig == nil {
l, err = net.Listen("tcp", s.Addr[len(TransportTLS+"://"):])
} else {
l, err = tls.Listen("tcp", s.Addr[len(TransportTLS+"://"):], tlsConfig)
}
if err != nil {
return nil, err
}
return l, nil
}
// ListenPacket implements caddy.UDPServer interface.
func (s *serverTLS) ListenPacket() (net.PacketConn, error) { return nil, nil }
// OnStartupComplete lists the sites served by this server
// and any relevant information, assuming Quiet is false.
func (s *serverTLS) OnStartupComplete() {
if Quiet {
return
}
for zone, config := range s.zones {
fmt.Println(TransportTLS + "://" + zone + ":" + config.Port)
}
}
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