Add custom tls client support for v2ray h2/grpclite transports

transport/v2raygrpclite/client.go

@@ -13,6 +13,8 @@ import (
 	"github.com/sagernet/sing-box/option"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+
+	"golang.org/x/net/http2"
 )
 
 var _ adapter.V2RayClientTransport = (*Client)(nil)
@@ -27,27 +29,37 @@ type Client struct {
 	ctx        context.Context
 	dialer     N.Dialer
 	serverAddr M.Socksaddr
-	transport  *http.Transport
+	transport  http.RoundTripper
 	options    option.V2RayGRPCOptions
 	url        *url.URL
 }
 
 func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayGRPCOptions, tlsConfig tls.Config) adapter.V2RayClientTransport {
-	return &Client{
-		ctx:        ctx,
-		dialer:     dialer,
-		serverAddr: serverAddr,
-		options:    options,
-		transport: &http.Transport{
-			DialTLSContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+	var transport http.RoundTripper
+	if tlsConfig == nil {
+		transport = &http.Transport{
+			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+				return dialer.DialContext(ctx, network, M.ParseSocksaddr(addr))
+			},
+		}
+	} else {
+		tlsConfig.SetNextProtos([]string{http2.NextProtoTLS})
+		transport = &http2.Transport{
+			DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.STDConfig) (net.Conn, error) {
 				conn, err := dialer.DialContext(ctx, network, M.ParseSocksaddr(addr))
 				if err != nil {
 					return nil, err
 				}
 				return tls.ClientHandshake(ctx, conn, tlsConfig)
 			},
-			ForceAttemptHTTP2: true,
-		},
+		}
+	}
+	return &Client{
+		ctx:        ctx,
+		dialer:     dialer,
+		serverAddr: serverAddr,
+		options:    options,
+		transport:  transport,
 		url: &url.URL{
 			Scheme: "https",
 			Host:   serverAddr.String(),