Add TLS fragment support

route/conn.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing-box/common/dialer"
+	"github.com/sagernet/sing-box/common/tlsfragment"
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/buf"
@@ -78,6 +79,21 @@ func (m *ConnectionManager) NewConnection(ctx context.Context, this N.Dialer, co
 		m.logger.ErrorContext(ctx, err)
 		return
 	}
+	if metadata.TLSFragment {
+		fallbackDelay := metadata.TLSFragmentFallbackDelay
+		if fallbackDelay == 0 {
+			fallbackDelay = C.TLSFragmentFallbackDelay
+		}
+		var newConn *tf.Conn
+		newConn, err = tf.NewConn(remoteConn, ctx, fallbackDelay)
+		if err != nil {
+			conn.Close()
+			remoteConn.Close()
+			m.logger.ErrorContext(ctx, err)
+			return
+		}
+		remoteConn = newConn
+	}
 	m.access.Lock()
 	element := m.connections.PushBack(conn)
 	m.access.Unlock()