freebsd/openbsd support (experimental)

pkg/tun/tun_unix.go

@@ -0,0 +1,69 @@
+// +build darwin freebsd openbsd
+
+package tun
+
+import (
+	"golang.zx2c4.com/wireguard/tun"
+
+	"github.com/xjasonlyu/clash/common/pool"
+	"github.com/xjasonlyu/tun2socks/pkg/link/rwc"
+)
+
+const offset = 4
+
+type unixTun struct {
+	*rwc.Endpoint
+
+	device tun.Device
+}
+
+func CreateTUN(name string, n uint32) (Device, error) {
+	device, err := tun.CreateTUN(name, int(n))
+	if err != nil {
+		return nil, err
+	}
+
+	mtu, err := device.MTU()
+	if err != nil {
+		return nil, err
+	}
+
+	ut := &unixTun{
+		device: device,
+	}
+
+	if ut.Endpoint, err = rwc.New(ut, uint32(mtu)); err != nil {
+		return nil, err
+	}
+
+	return ut, nil
+}
+
+func (t *unixTun) Read(packet []byte) (n int, err error) {
+	buf := pool.Get(offset + len(packet))
+	defer pool.Put(buf)
+
+	if n, err = t.device.Read(buf, offset); err != nil {
+		return
+	}
+
+	copy(packet, buf[offset:offset+n])
+	return
+}
+
+func (t *unixTun) Write(packet []byte) (int, error) {
+	buf := pool.Get(offset + len(packet))
+	defer pool.Put(buf)
+
+	copy(buf[offset:], packet)
+	return t.device.Write(buf[:offset+len(packet)], offset)
+}
+
+func (t *unixTun) Name() string {
+	name, _ := t.device.Name()
+	return name
+}
+
+func (t *unixTun) Close() error {
+	return t.device.Close()
+}