chore: Adopt sing-tun's update

listener/sing_tun/server.go

@@ -229,8 +229,8 @@ func New(options LC.Tun, tcpIn chan<- C.ConnContext, udpIn chan<- C.PacketAdapte
 		err = E.Cause(err, "configure tun interface")
 		return
 	}
-	l.tunIf = tunIf
-	l.tunStack, err = tun.NewStack(strings.ToLower(options.Stack.String()), tun.StackOptions{
+
+	stackOptions := tun.StackOptions{
 		Context:                context.TODO(),
 		Tun:                    tunIf,
 		MTU:                    tunOptions.MTU,
@@ -241,7 +241,16 @@ func New(options LC.Tun, tcpIn chan<- C.ConnContext, udpIn chan<- C.PacketAdapte
 		UDPTimeout:             udpTimeout,
 		Handler:                handler,
 		Logger:                 log.SingLogger,
-	})
+	}
+
+	if options.FileDescriptor > 0 {
+		if tunName, err := getTunnelName(int32(options.FileDescriptor)); err != nil {
+			stackOptions.Name = tunName
+			stackOptions.UnderPlatform = true
+		}
+	}
+	l.tunIf = tunIf
+	l.tunStack, err = tun.NewStack(strings.ToLower(options.Stack.String()), stackOptions)
 	if err != nil {
 		return
 	}

listener/sing_tun/tun_name_darwin.go

@@ -0,0 +1,11 @@
+package sing_tun
+
+import "golang.org/x/sys/unix"
+
+func getTunnelName(fd int32) (string, error) {
+	return unix.GetsockoptString(
+		int(fd),
+		2, /* #define SYSPROTO_CONTROL 2 */
+		2, /* #define UTUN_OPT_IFNAME 2 */
+	)
+}

listener/sing_tun/tun_name_linux.go

@@ -0,0 +1,25 @@
+package sing_tun
+
+import (
+	"fmt"
+	"golang.org/x/sys/unix"
+	"syscall"
+	"unsafe"
+)
+
+const ifReqSize = unix.IFNAMSIZ + 64
+
+func getTunnelName(fd int32) (string, error) {
+	var ifr [ifReqSize]byte
+	var errno syscall.Errno
+	_, _, errno = unix.Syscall(
+		unix.SYS_IOCTL,
+		uintptr(fd),
+		uintptr(unix.TUNGETIFF),
+		uintptr(unsafe.Pointer(&ifr[0])),
+	)
+	if errno != 0 {
+		return "", fmt.Errorf("failed to get name of TUN device: %w", errno)
+	}
+	return unix.ByteSliceToString(ifr[:]), nil
+}

listener/sing_tun/tun_name_other.go

@@ -0,0 +1,9 @@
+//go:build !(darwin || linux)
+
+package sing_tun
+
+import "os"
+
+func getTunnelName(fd int32) (string, error) {
+	return "", os.ErrInvalid
+}