Function CreateTUNFromFile

polyamide/tun/tun_darwin.go:135–177

(file *os.File, mtu int)

}

func CreateTUNFromFile(file *os.File, mtu int) (Device, error) {
	tun := &NativeTun{
		tunFile: file,
		events:  make(chan Event, 10),
		errors:  make(chan error, 5),
	}

	name, err := tun.Name()
	if err != nil {
		tun.tunFile.Close()
		return nil, err
	}

	tunIfindex, err := func() (int, error) {
		iface, err := net.InterfaceByName(name)
		if err != nil {
			return -1, err
		}
		return iface.Index, nil
	}()
	if err != nil {
		tun.tunFile.Close()
		return nil, err
	}

	tun.routeSocket, err = socketCloexec(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC)
	if err != nil {
		tun.tunFile.Close()
		return nil, err
	}

	go tun.routineRouteListener(tunIfindex)

	if mtu > 0 {
		err = tun.setMTU(mtu)
		if err != nil {
			tun.Close()
			return nil, err
		}
	}

	return tun, nil
}

func (tun *NativeTun) Name() (string, error) {
	var err error