Fix platform interface monitor & Fix system tun stack for ios

experimental/libbox/platform/interface.go

@@ -11,7 +11,7 @@ import (
 
 type Interface interface {
 	AutoDetectInterfaceControl() control.Func
-	OpenTun(options tun.Options, platformOptions option.TunPlatformOptions) (tun.Tun, error)
+	OpenTun(options *tun.Options, platformOptions option.TunPlatformOptions) (tun.Tun, error)
 	process.Searcher
 	io.Writer
 }

experimental/libbox/service.go

@@ -68,7 +68,7 @@ func (w *platformInterfaceWrapper) AutoDetectInterfaceControl() control.Func {
 	}
 }
 
-func (w *platformInterfaceWrapper) OpenTun(options tun.Options, platformOptions option.TunPlatformOptions) (tun.Tun, error) {
+func (w *platformInterfaceWrapper) OpenTun(options *tun.Options, platformOptions option.TunPlatformOptions) (tun.Tun, error) {
 	if len(options.IncludeUID) > 0 || len(options.ExcludeUID) > 0 {
 		return nil, E.New("android: unsupported uid options")
 	}
@@ -79,12 +79,16 @@ func (w *platformInterfaceWrapper) OpenTun(options tun.Options, platformOptions
 	if err != nil {
 		return nil, err
 	}
+	options.Name, err = getTunnelName(tunFd)
+	if err != nil {
+		return nil, E.Cause(err, "query tun name")
+	}
 	dupFd, err := dup(int(tunFd))
 	if err != nil {
 		return nil, E.Cause(err, "dup tun file descriptor")
 	}
 	options.FileDescriptor = dupFd
-	return tun.New(options)
+	return tun.New(*options)
 }
 
 func (w *platformInterfaceWrapper) Write(p []byte) (n int, err error) {

experimental/libbox/tun.go

@@ -59,7 +59,7 @@ func mapRoutePrefix(prefixes []netip.Prefix) RoutePrefixIterator {
 var _ TunOptions = (*tunOptions)(nil)
 
 type tunOptions struct {
-	tun.Options
+	*tun.Options
 	option.TunPlatformOptions
 }
 

experimental/libbox/tun_name_darwin.go

@@ -0,0 +1,11 @@
+package libbox
+
+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 */
+	)
+}

experimental/libbox/tun_name_linux.go

@@ -0,0 +1,26 @@
+package libbox
+
+import (
+	"fmt"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+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
+}

experimental/libbox/tun_name_other.go

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