Fix tailscale dns

dns/transport/https.go

@@ -120,13 +120,16 @@ func NewHTTPSRaw(
 	serverAddr M.Socksaddr,
 	tlsConfig tls.Config,
 ) *HTTPSTransport {
+	if tlsConfig != nil {
+		dialer = tls.NewDialer(dialer, tlsConfig)
+	}
 	return &HTTPSTransport{
 		TransportAdapter: adapter,
 		logger:           logger,
 		dialer:           dialer,
 		destination:      destination,
 		headers:          headers,
-		transport:        NewHTTPSTransportWrapper(tls.NewDialer(dialer, tlsConfig), serverAddr),
+		transport:        NewHTTPSTransportWrapper(dialer, serverAddr, destination),
 	}
 }
 

dns/transport/https_transport.go

@@ -5,11 +5,13 @@ import (
 	"errors"
 	"net"
 	"net/http"
+	"net/url"
 	"sync/atomic"
 
 	"github.com/sagernet/sing-box/common/tls"
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
 
 	"golang.org/x/net/http2"
 )
@@ -22,27 +24,36 @@ type HTTPSTransportWrapper struct {
 	fallback       *atomic.Bool
 }
 
-func NewHTTPSTransportWrapper(dialer tls.Dialer, serverAddr M.Socksaddr) *HTTPSTransportWrapper {
+func NewHTTPSTransportWrapper(dialer N.Dialer, serverAddr M.Socksaddr, destination *url.URL) *HTTPSTransportWrapper {
 	var fallback atomic.Bool
+	if destination.Scheme == "http" {
+		// plain HTTP DoH used by Tailscale
+		fallback.Store(true)
+	}
 	return &HTTPSTransportWrapper{
 		http2Transport: &http2.Transport{
 			DialTLSContext: func(ctx context.Context, _, _ string, _ *tls.STDConfig) (net.Conn, error) {
-				tlsConn, err := dialer.DialTLSContext(ctx, serverAddr)
+				resultConn, err := dialer.DialContext(ctx, N.NetworkTCP, serverAddr)
 				if err != nil {
 					return nil, err
 				}
+				if tlsConn, isTLSConn := resultConn.(tls.Conn); isTLSConn {
 					state := tlsConn.ConnectionState()
-				if state.NegotiatedProtocol == http2.NextProtoTLS {
+					if state.NegotiatedProtocol != http2.NextProtoTLS {
-					return tlsConn, nil
-				}
 						tlsConn.Close()
 						fallback.Store(true)
 						return nil, errFallback
+					}
+				}
+				return resultConn, nil
 			},
 		},
 		httpTransport: &http.Transport{
+			DialContext: func(ctx context.Context, _, addr string) (net.Conn, error) {
+				return dialer.DialContext(ctx, N.NetworkTCP, serverAddr)
+			},
 			DialTLSContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
-				return dialer.DialTLSContext(ctx, serverAddr)
+				return dialer.DialContext(ctx, N.NetworkTCP, serverAddr)
 			},
 		},
 		fallback: &fallback,
@@ -52,7 +63,7 @@ func NewHTTPSTransportWrapper(dialer tls.Dialer, serverAddr M.Socksaddr) *HTTPST
 func (h *HTTPSTransportWrapper) RoundTrip(request *http.Request) (*http.Response, error) {
 	if h.fallback.Load() {
 		return h.httpTransport.RoundTrip(request)
-	} else {
+	}
 	response, err := h.http2Transport.RoundTrip(request)
 	if err != nil {
 		if errors.Is(err, errFallback) {
@@ -62,7 +73,6 @@ func (h *HTTPSTransportWrapper) RoundTrip(request *http.Request) (*http.Response
 	}
 	return response, nil
 }
-}
 
 func (h *HTTPSTransportWrapper) CloseIdleConnections() {
 	h.http2Transport.CloseIdleConnections()

protocol/tailscale/dns_transport.go

@@ -161,8 +161,9 @@ func (t *DNSTransport) updateDNSServers(routeConfig *router.Config, dnsConfig *n
 
 func (t *DNSTransport) createResolver(directDialer func() N.Dialer, resolver *dnstype.Resolver) (adapter.DNSTransport, error) {
 	serverURL, parseURLErr := url.Parse(resolver.Addr)
+	isHTTPScheme := parseURLErr == nil && (serverURL.Scheme == "http" || serverURL.Scheme == "https")
 	var myDialer N.Dialer
-	if parseURLErr == nil && serverURL.Scheme == "http" {
+	if isHTTPScheme && serverURL.Scheme == "http" {
 		myDialer = t.endpoint
 	} else {
 		myDialer = directDialer()
@@ -170,36 +171,39 @@ func (t *DNSTransport) createResolver(directDialer func() N.Dialer, resolver *dn
 	if len(resolver.BootstrapResolution) > 0 {
 		bootstrapTransport := transport.NewUDPRaw(t.logger, t.TransportAdapter, myDialer, M.SocksaddrFrom(resolver.BootstrapResolution[0], 53))
 		myDialer = dialer.NewResolveDialer(t.ctx, myDialer, false, "", adapter.DNSQueryOptions{Transport: bootstrapTransport}, 0)
-	}
-	if serverAddr := M.ParseSocksaddr(resolver.Addr); serverAddr.IsValid() {
-		if serverAddr.Port == 0 {
-			serverAddr.Port = 53
-		}
-		return transport.NewUDPRaw(t.logger, t.TransportAdapter, myDialer, serverAddr), nil
-	} else if parseURLErr != nil {
-		return nil, E.Cause(parseURLErr, "parse resolver address")
 	} else {
+		myDialer = dialer.NewResolveDialer(t.ctx, myDialer, false, "", t.endpoint.queryOptions, 0)
+	}
+	if isHTTPScheme {
+		serverAddr := M.ParseSocksaddrHostPortStr(serverURL.Hostname(), serverURL.Port())
 		switch serverURL.Scheme {
 		case "https":
-			serverAddr = M.ParseSocksaddrHostPortStr(serverURL.Hostname(), serverURL.Port())
 			if serverAddr.Port == 0 {
 				serverAddr.Port = 443
 			}
 			tlsConfig := common.Must1(tls.NewClient(t.ctx, t.logger, serverAddr.AddrString(), option.OutboundTLSOptions{
+				Enabled: true,
 				ALPN:    []string{http2.NextProtoTLS, "http/1.1"},
 			}))
 			return transport.NewHTTPSRaw(t.TransportAdapter, t.logger, myDialer, serverURL, http.Header{}, serverAddr, tlsConfig), nil
 		case "http":
-			serverAddr = M.ParseSocksaddrHostPortStr(serverURL.Hostname(), serverURL.Port())
 			if serverAddr.Port == 0 {
 				serverAddr.Port = 80
 			}
 			return transport.NewHTTPSRaw(t.TransportAdapter, t.logger, myDialer, serverURL, http.Header{}, serverAddr, nil), nil
-		// case "tls":
-		default:
-			return nil, E.New("unknown resolver scheme: ", serverURL.Scheme)
 		}
 	}
+	serverAddr := M.ParseSocksaddr(resolver.Addr)
+	if !serverAddr.IsValid() {
+		if parseURLErr != nil {
+			return nil, E.Cause(parseURLErr, "parse resolver address")
+		}
+		return nil, E.New("invalid resolver address: ", resolver.Addr)
+	}
+	if serverAddr.Port == 0 {
+		serverAddr.Port = 53
+	}
+	return transport.NewUDPRaw(t.logger, t.TransportAdapter, myDialer, serverAddr), nil
 }
 
 func buildRoutePrefixes(routeConfig *router.Config) []netip.Prefix {

protocol/tailscale/endpoint.go

@@ -83,6 +83,7 @@ type Endpoint struct {
 	ctx               context.Context
 	router            adapter.Router
 	logger            logger.ContextLogger
+	queryOptions      adapter.DNSQueryOptions
 	dnsRouter         adapter.DNSRouter
 	network           adapter.NetworkManager
 	platformInterface adapter.PlatformInterface
@@ -246,6 +247,7 @@ func NewEndpoint(ctx context.Context, router adapter.Router, logger log.ContextL
 		ctx:                        ctx,
 		router:                     router,
 		logger:                     logger,
+		queryOptions:               outboundDialer.(dialer.ResolveDialer).QueryOptions(),
 		dnsRouter:                  dnsRouter,
 		network:                    service.FromContext[adapter.NetworkManager](ctx),
 		platformInterface:          service.FromContext[adapter.PlatformInterface](ctx),