Add shadow-tls support

common/singbridge/dialer_tls.go

@@ -0,0 +1,41 @@
+package singbridge
+
+import (
+	"context"
+	gotls "crypto/tls"
+	"os"
+
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/tls"
+)
+
+type XrayTLSDialer struct {
+	dialer     internet.Dialer
+	clientFunc tls.CustomClientFunc
+}
+
+func NewTLSDialer(dialer internet.Dialer, clientFunc tls.CustomClientFunc) *XrayTLSDialer {
+	return &XrayTLSDialer{dialer, clientFunc}
+}
+
+func (d *XrayTLSDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
+	var tlsConfig *gotls.Config
+	conn, err := d.dialer.Dial(tls.ContextWithCustomClient(ctx, func(conn net.Conn, config *gotls.Config) net.Conn {
+		tlsConfig = config
+		return conn
+	}), ToDestination(destination, ToNetwork(network)))
+	if err != nil {
+		return nil, err
+	}
+	if tlsConfig == nil {
+		return nil, E.New("missing TLS config")
+	}
+	return d.clientFunc(conn, tlsConfig), nil
+}
+
+func (d *XrayTLSDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
+	return nil, os.ErrInvalid
+}