Update TUN creation

experimental/libbox/log_client.go

@@ -1,4 +1,4 @@
-//go:build ios
+//go:build darwin
 
 package libbox
 

experimental/libbox/log_server.go

@@ -1,4 +1,4 @@
-//go:build ios
+//go:build darwin
 
 package libbox
 

experimental/libbox/platform.go

@@ -2,7 +2,7 @@ package libbox
 
 type PlatformInterface interface {
 	AutoDetectInterfaceControl(fd int32) error
-	OpenTun(options TunOptions) (TunInterface, error)
+	OpenTun(options TunOptions) (int32, error)
 	WriteLog(message string)
 	UseProcFS() bool
 	FindConnectionOwner(ipProtocol int32, sourceAddress string, sourcePort int32, destinationAddress string, destinationPort int32) (int32, error)

experimental/libbox/service.go

@@ -3,7 +3,6 @@ package libbox
 import (
 	"context"
 	"net/netip"
-	"os"
 	"runtime"
 	"syscall"
 
@@ -76,17 +75,12 @@ func (w *platformInterfaceWrapper) OpenTun(options tun.Options) (tun.Tun, error)
 	}
 
 	optionsWrapper := tunOptions(options)
-	tunInterface, err := w.iif.OpenTun(&optionsWrapper)
+	tunFd, err := w.iif.OpenTun(&optionsWrapper)
 	if err != nil {
 		return nil, err
 	}
-	tunFd := tunInterface.FileDescriptor()
-	return &nativeTun{
-		tunFd:   int(tunFd),
-		tunFile: os.NewFile(uintptr(tunFd), "tun"),
-		tunMTU:  options.MTU,
-		closer:  tunInterface,
-	}, nil
+	options.FileDescriptor = int(tunFd)
+	return tun.New(options)
 }
 
 func (w *platformInterfaceWrapper) Write(p []byte) (n int, err error) {

experimental/libbox/tun.go

@@ -1,13 +1,13 @@
 package libbox
 
 import (
-	"io"
+	"net"
 	"net/netip"
-	"os"
 
 	"github.com/sagernet/sing-tun"
 	"github.com/sagernet/sing/common"
 	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
 )
 
 type TunOptions interface {
@@ -28,6 +28,16 @@ type RoutePrefix struct {
 	Prefix  int32
 }
 
+func (p *RoutePrefix) Mask() string {
+	var bits int
+	if M.ParseSocksaddr(p.Address).Addr.Is6() {
+		bits = 128
+	} else {
+		bits = 32
+	}
+	return net.IP(net.CIDRMask(int(p.Prefix), bits)).String()
+}
+
 type RoutePrefixIterator interface {
 	Next() *RoutePrefix
 	HasNext() bool
@@ -88,22 +98,3 @@ func (o *tunOptions) GetIncludePackage() StringIterator {
 func (o *tunOptions) GetExcludePackage() StringIterator {
 	return newIterator(o.ExcludePackage)
 }
-
-type nativeTun struct {
-	tunFd   int
-	tunFile *os.File
-	tunMTU  uint32
-	closer  io.Closer
-}
-
-func (t *nativeTun) Read(p []byte) (n int, err error) {
-	return t.tunFile.Read(p)
-}
-
-func (t *nativeTun) Write(p []byte) (n int, err error) {
-	return t.tunFile.Write(p)
-}
-
-func (t *nativeTun) Close() error {
-	return t.closer.Close()
-}

experimental/libbox/tun_darwin.go

@@ -0,0 +1,34 @@
+package libbox
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+// kanged from wireauard-apple
+
+const utunControlName = "com.apple.net.utun_control"
+
+func GetTunnelFileDescriptor() int32 {
+	ctlInfo := &unix.CtlInfo{}
+	copy(ctlInfo.Name[:], utunControlName)
+	for fd := 0; fd < 1024; fd++ {
+		addr, err := unix.Getpeername(fd)
+		if err != nil {
+			continue
+		}
+		addrCTL, loaded := addr.(*unix.SockaddrCtl)
+		if !loaded {
+			continue
+		}
+		if ctlInfo.Id == 0 {
+			err = unix.IoctlCtlInfo(fd, ctlInfo)
+			if err != nil {
+				continue
+			}
+		}
+		if addrCTL.ID == ctlInfo.Id {
+			return int32(fd)
+		}
+	}
+	return -1
+}

experimental/libbox/tun_gvisor.go

@@ -1,19 +0,0 @@
-//go:build with_gvisor && linux
-
-package libbox
-
-import (
-	"github.com/sagernet/sing-tun"
-
-	"gvisor.dev/gvisor/pkg/tcpip/link/fdbased"
-	"gvisor.dev/gvisor/pkg/tcpip/stack"
-)
-
-var _ tun.GVisorTun = (*nativeTun)(nil)
-
-func (t *nativeTun) NewEndpoint() (stack.LinkEndpoint, error) {
-	return fdbased.New(&fdbased.Options{
-		FDs: []int{t.tunFd},
-		MTU: t.tunMTU,
-	})
-}