tun_windows: Introduce preliminary TUN interface creation
Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman
parent
46279ad0f9
commit
cb2bc4b34c
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@ -300,6 +300,21 @@ const (
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DICS_FLAG_CONFIGGENERAL DICS_FLAG = 0x00000004 // 1 or more hardware profile-specific changes to follow
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)
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// DI_REMOVEDEVICE specifies the scope of the device removal
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type DI_REMOVEDEVICE uint32
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const (
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DI_REMOVEDEVICE_GLOBAL DI_REMOVEDEVICE = 0x00000001 // Make this change in all hardware profiles. Remove information about the device from the registry.
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DI_REMOVEDEVICE_CONFIGSPECIFIC DI_REMOVEDEVICE = 0x00000002 // Make this change to only the hardware profile specified by HwProfile. this flag only applies to root-enumerated devices. When Windows removes the device from the last hardware profile in which it was configured, Windows performs a global removal.
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)
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// SP_REMOVEDEVICE_PARAMS is a structure corresponding to a DIF_REMOVE install function.
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type SP_REMOVEDEVICE_PARAMS struct {
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ClassInstallHeader SP_CLASSINSTALL_HEADER
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Scope DI_REMOVEDEVICE
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HwProfile uint32
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}
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type SP_DRVINFO_DATA struct {
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Size uint32
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DriverType uint32
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@ -5,13 +5,20 @@
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package tun
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//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output ztun_windows.go tun_windows.go
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import (
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"errors"
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"fmt"
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"os"
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"strings"
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"syscall"
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"time"
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"unsafe"
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"git.zx2c4.com/wireguard-go/setupapi"
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"golang.org/x/sys/windows"
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"golang.org/x/sys/windows/registry"
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)
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const (
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@ -27,6 +34,10 @@ const (
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TUN_SIGNAL_MAX = 2
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)
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var deviceClassNetGUID = windows.GUID{0x4d36e972, 0xe325, 0x11ce, [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
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const TUN_HWID = "Wintun"
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type TunPacket struct {
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size uint32
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data [TUN_MAX_PACKET_SIZE]byte
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@ -39,7 +50,7 @@ type TunRWQueue struct {
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}
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type nativeTun struct {
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ifname string
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ifid *windows.GUID
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tunName string
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signalName *uint16
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tunFile *os.File
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@ -52,15 +63,31 @@ type nativeTun struct {
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}
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func CreateTUN(ifname string) (TUNDevice, error) {
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signalNameUTF16, err := windows.UTF16PtrFromString(fmt.Sprintf("Global\\WINTUN_EVENT_%s", ifname))
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// Does an interface with this name already exist?
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ifid, err := getInterface(ifname, 0)
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if ifid == nil || err != nil {
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// Interface does not exist or an error occured. Create one.
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ifid, _, err = createInterface("", 0)
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if err != nil {
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return nil, err
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}
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// Set interface name. (Ignore errors.)
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setInterfaceName(ifid, ifname)
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}
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ifidStr := guidToString(ifid)
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signalNameUTF16, err := windows.UTF16PtrFromString(fmt.Sprintf("Global\\WINTUN_EVENT_%s", ifidStr))
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if err != nil {
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deleteInterface(ifid, 0)
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return nil, err
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}
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// Create instance.
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tun := &nativeTun{
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ifname: ifname,
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tunName: fmt.Sprintf("\\\\.\\Global\\WINTUN_DEVICE_%s", ifname),
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ifid: ifid,
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tunName: fmt.Sprintf("\\\\.\\Global\\WINTUN_DEVICE_%s", ifidStr),
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signalName: signalNameUTF16,
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events: make(chan TUNEvent, 10),
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errors: make(chan error, 1),
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@ -69,6 +96,7 @@ func CreateTUN(ifname string) (TUNDevice, error) {
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// Create close event.
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tun.signals[TUN_SIGNAL_CLOSE], err = windows.CreateEvent(nil, 1 /*TRUE*/, 0 /*FALSE*/, nil)
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if err != nil {
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deleteInterface(ifid, 0)
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return nil, err
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}
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@ -132,7 +160,7 @@ func (tun *nativeTun) closeTUN() (err error) {
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}
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func (tun *nativeTun) Name() (string, error) {
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return tun.ifname, nil
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return getInterfaceName(tun.ifid)
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}
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func (tun *nativeTun) File() *os.File {
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@ -156,6 +184,11 @@ func (tun *nativeTun) Close() error {
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close(tun.events)
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}
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_, _, e = deleteInterface(tun.ifid, 0)
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if err == nil {
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err = e
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}
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return err
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}
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@ -283,3 +316,457 @@ func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
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// Flush write buffer.
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return len(buff) - offset, tun.flush()
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}
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//
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// getInterface finds interface ID by name.
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//
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// hwndParent is a handle to the top-level window to use for any user
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// interface that is related to non-device-specific actions (such as a select-
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// device dialog box that uses the global class driver list). This handle is
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// optional and can be 0. If a specific top-level window is not required, set
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// hwndParent to 0.
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//
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// Function returns interface ID when the interface was found, or nil
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// otherwise.
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//
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func getInterface(ifname string, hwndParent uintptr) (*windows.GUID, error) {
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// Create a list of network devices.
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devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
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if err != nil {
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return nil, err
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}
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defer devInfoList.Close()
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// Retrieve information associated with a device information set.
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// TODO: Is this really necessary?
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_, err = devInfoList.GetDeviceInfoListDetail()
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if err != nil {
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return nil, err
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}
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ifname = strings.ToLower(ifname)
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// Iterate.
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for index := 0; ; index++ {
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// Get the device from the list.
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deviceData, err := devInfoList.EnumDeviceInfo(index)
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if err != nil {
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if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
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break
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}
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// Something is wrong with this device. Skip it.
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continue
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}
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// Get interface ID.
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ifid, err := getInterfaceId(devInfoList, deviceData, 1)
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if err != nil {
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// Something is wrong with this device. Skip it.
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continue
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}
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// Get interface name.
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ifname2, err := getInterfaceName(ifid)
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if err != nil {
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// Something is wrong with this device. Skip it.
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continue
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}
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if ifname == strings.ToLower(ifname2) {
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// Interface name found.
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return ifid, nil
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}
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}
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return nil, nil
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}
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//
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// createInterface creates a TUN interface.
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//
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// description is a string that supplies the text description of the device.
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// Description is optional and can be "".
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//
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// hwndParent is a handle to the top-level window to use for any user
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// interface that is related to non-device-specific actions (such as a select-
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// device dialog box that uses the global class driver list). This handle is
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// optional and can be 0. If a specific top-level window is not required, set
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// hwndParent to 0.
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//
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// Function returns the network interface ID and a flag if reboot is required.
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//
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func createInterface(description string, hwndParent uintptr) (*windows.GUID, bool, error) {
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// Create an empty device info set for network adapter device class.
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devInfoList, err := setupapi.SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, hwndParent, "")
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if err != nil {
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return nil, false, err
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}
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// Get the device class name from GUID.
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className, err := setupapi.SetupDiClassNameFromGuidEx(&deviceClassNetGUID, "")
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if err != nil {
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return nil, false, err
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}
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// Create a new device info element and add it to the device info set.
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deviceData, err := devInfoList.CreateDeviceInfo(className, &deviceClassNetGUID, description, hwndParent, setupapi.DICD_GENERATE_ID)
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if err != nil {
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return nil, false, err
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}
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// Set a device information element as the selected member of a device information set.
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err = devInfoList.SetSelectedDevice(deviceData)
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if err != nil {
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return nil, false, err
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}
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// Set Plug&Play device hardware ID property.
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hwid, err := syscall.UTF16FromString(TUN_HWID)
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if err != nil {
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return nil, false, err
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}
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err = devInfoList.SetDeviceRegistryProperty(deviceData, setupapi.SPDRP_HARDWAREID, setupapi.UTF16ToBuf(append(hwid, 0)))
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if err != nil {
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return nil, false, err
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}
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// Search for the driver.
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const driverType = setupapi.SPDIT_CLASSDRIVER
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err = devInfoList.BuildDriverInfoList(deviceData, driverType)
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if err != nil {
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return nil, false, err
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}
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defer devInfoList.DestroyDriverInfoList(deviceData, driverType)
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driverDate := windows.Filetime{}
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driverVersion := uint64(0)
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for index := 0; ; index++ {
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// Get a driver from the list.
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driverData, err := devInfoList.EnumDriverInfo(deviceData, driverType, index)
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if err != nil {
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if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
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break
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}
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// Something is wrong with this driver. Skip it.
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continue
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}
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// Check the driver version first, since the check is trivial and will save us iterating over hardware IDs for any driver versioned prior our best match.
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if driverData.IsNewer(driverDate, driverVersion) {
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// Get driver info details.
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driverDetailData, err := devInfoList.GetDriverInfoDetail(deviceData, driverData)
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if err != nil {
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// Something is wrong with this driver. Skip it.
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continue
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}
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if driverDetailData.IsCompatible(TUN_HWID) {
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// Matching hardware ID found. Select the driver.
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err := devInfoList.SetSelectedDriver(deviceData, driverData)
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if err != nil {
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// Something is wrong with this driver. Skip it.
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continue
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}
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driverDate = driverData.DriverDate
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driverVersion = driverData.DriverVersion
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}
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}
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}
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if driverVersion == 0 {
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return nil, false, fmt.Errorf("No driver for device \"%v\" installed", TUN_HWID)
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}
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// Call appropriate class installer.
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err = devInfoList.CallClassInstaller(setupapi.DIF_REGISTERDEVICE, deviceData)
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if err != nil {
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return nil, false, err
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}
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// Register device co-installers if any.
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devInfoList.CallClassInstaller(setupapi.DIF_REGISTER_COINSTALLERS, deviceData)
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// Install interfaces if any.
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devInfoList.CallClassInstaller(setupapi.DIF_INSTALLINTERFACES, deviceData)
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var ifid *windows.GUID
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var rebootRequired bool
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// Install the device.
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err = devInfoList.CallClassInstaller(setupapi.DIF_INSTALLDEVICE, deviceData)
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if err == nil {
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// Check if a system reboot is required. (Ignore errors)
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if ret, _ := checkReboot(devInfoList, deviceData); ret {
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rebootRequired = true
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}
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// Get network interface ID from registry. Retry for max 30sec.
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ifid, err = getInterfaceId(devInfoList, deviceData, 30)
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}
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if err == nil {
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return ifid, rebootRequired, nil
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}
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// The interface failed to install, or the interface ID was unobtainable. Clean-up.
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removeDeviceParams := setupapi.SP_REMOVEDEVICE_PARAMS{
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ClassInstallHeader: setupapi.SP_CLASSINSTALL_HEADER{
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InstallFunction: setupapi.DIF_REMOVE,
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},
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Scope: setupapi.DI_REMOVEDEVICE_GLOBAL,
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}
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removeDeviceParams.ClassInstallHeader.Size = uint32(unsafe.Sizeof(removeDeviceParams.ClassInstallHeader))
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// Set class installer parameters for DIF_REMOVE.
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if devInfoList.SetClassInstallParams(deviceData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams))) == nil {
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// Call appropriate class installer.
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if devInfoList.CallClassInstaller(setupapi.DIF_REMOVE, deviceData) == nil {
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// Check if a system reboot is required. (Ignore errors)
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if ret, _ := checkReboot(devInfoList, deviceData); ret {
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rebootRequired = true
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}
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}
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}
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return nil, false, err
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}
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//
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// deleteInterface deletes a TUN interface.
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//
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// hwndParent is a handle to the top-level window to use for any user
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// interface that is related to non-device-specific actions (such as a select-
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// device dialog box that uses the global class driver list). This handle is
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// optional and can be 0. If a specific top-level window is not required, set
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// hwndParent to 0.
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//
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// Function returns true if the interface was found and deleted and a flag if
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// reboot is required.
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//
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func deleteInterface(ifid *windows.GUID, hwndParent uintptr) (bool, bool, error) {
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// Create a list of network devices.
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devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
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if err != nil {
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return false, false, err
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}
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defer devInfoList.Close()
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// Retrieve information associated with a device information set.
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// TODO: Is this really necessary?
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_, err = devInfoList.GetDeviceInfoListDetail()
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if err != nil {
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return false, false, err
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}
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// Iterate.
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for index := 0; ; index++ {
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// Get the device from the list.
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deviceData, err := devInfoList.EnumDeviceInfo(index)
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if err != nil {
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if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
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break
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}
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// Something is wrong with this device. Skip it.
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continue
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}
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// Get interface ID.
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ifid2, err := getInterfaceId(devInfoList, deviceData, 1)
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if err != nil {
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// Something is wrong with this device. Skip it.
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continue
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}
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if ifid == ifid2 {
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// Remove the device.
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removeDeviceParams := setupapi.SP_REMOVEDEVICE_PARAMS{
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ClassInstallHeader: setupapi.SP_CLASSINSTALL_HEADER{
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InstallFunction: setupapi.DIF_REMOVE,
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},
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Scope: setupapi.DI_REMOVEDEVICE_GLOBAL,
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}
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removeDeviceParams.ClassInstallHeader.Size = uint32(unsafe.Sizeof(removeDeviceParams.ClassInstallHeader))
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// Set class installer parameters for DIF_REMOVE.
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err = devInfoList.SetClassInstallParams(deviceData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams)))
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if err != nil {
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return false, false, err
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}
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// Call appropriate class installer.
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err = devInfoList.CallClassInstaller(setupapi.DIF_REMOVE, deviceData)
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if err != nil {
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return false, false, err
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}
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// Check if a system reboot is required. (Ignore errors)
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if ret, _ := checkReboot(devInfoList, deviceData); ret {
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return true, true, nil
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}
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return true, false, nil
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}
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}
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return false, false, nil
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}
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///
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/// checkReboot checks device install parameters if a system reboot is required.
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///
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func checkReboot(DeviceInfoSet setupapi.DevInfo, DeviceInfoData *setupapi.SP_DEVINFO_DATA) (bool, error) {
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devInstallParams, err := DeviceInfoSet.GetDeviceInstallParams(DeviceInfoData)
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if err != nil {
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return false, err
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}
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if (devInstallParams.Flags & (setupapi.DI_NEEDREBOOT | setupapi.DI_NEEDRESTART)) != 0 {
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return true, nil
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}
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return false, nil
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}
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// getInterfaceId returns network interface ID.
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//
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// After the device is created, it might take some time before the registry
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// key is populated. numAttempts parameter specifies the number of attempts
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// to read NetCfgInstanceId value from registry. A 1sec sleep is inserted
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// between retry attempts.
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//
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// Function returns the network interface ID.
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//
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func getInterfaceId(DeviceInfoSet setupapi.DevInfo, DeviceInfoData *setupapi.SP_DEVINFO_DATA, numAttempts int) (*windows.GUID, error) {
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if numAttempts < 1 {
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return nil, fmt.Errorf("Invalid numAttempts (expected: >=1, provided: %v)", numAttempts)
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}
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// Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\<class>\<id> registry key.
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key, err := DeviceInfoSet.OpenDevRegKey(DeviceInfoData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.READ)
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if err != nil {
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return nil, errors.New("Device-specific registry key open failed: " + err.Error())
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}
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defer key.Close()
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for {
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// Query the NetCfgInstanceId value. Using get_reg_string() right on might clutter the output with error messages while the registry is still being populated.
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_, _, err = key.GetValue("NetCfgInstanceId", nil)
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if err != nil {
|
||||
if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_FILE_NOT_FOUND {
|
||||
numAttempts--
|
||||
if numAttempts > 0 {
|
||||
// Wait and retry.
|
||||
// TODO: Wait for a cancellable event instead.
|
||||
time.Sleep(1000 * time.Millisecond)
|
||||
continue
|
||||
}
|
||||
}
|
||||
|
||||
return nil, errors.New("RegQueryValueEx(\"NetCfgInstanceId\") failed: " + err.Error())
|
||||
}
|
||||
|
||||
// Read the NetCfgInstanceId value now.
|
||||
value, err := getRegStringValue(key, "NetCfgInstanceId")
|
||||
if err != nil {
|
||||
return nil, errors.New("RegQueryStringValue(\"NetCfgInstanceId\") failed: " + err.Error())
|
||||
}
|
||||
|
||||
// Convert to windows.GUID.
|
||||
ifid, err := stringToGUID(value)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("NetCfgInstanceId registry value is not a GUID (expected: \"{...}\", provided: \"%v\")", value)
|
||||
}
|
||||
|
||||
return ifid, err
|
||||
}
|
||||
}
|
||||
|
||||
//
|
||||
// getInterfaceName returns network interface name.
|
||||
//
|
||||
func getInterfaceName(ifid *windows.GUID) (string, error) {
|
||||
// Open network interface registry key.
|
||||
key, err := registry.OpenKey(registry.LOCAL_MACHINE, fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guidToString(&deviceClassNetGUID), guidToString(ifid)), registry.QUERY_VALUE)
|
||||
if err != nil {
|
||||
return "", errors.New("Network-specific registry key open failed: " + err.Error())
|
||||
}
|
||||
defer key.Close()
|
||||
|
||||
// Get the interface name.
|
||||
return getRegStringValue(key, "Name")
|
||||
}
|
||||
|
||||
//
|
||||
// setInterfaceName sets network interface name.
|
||||
//
|
||||
func setInterfaceName(ifid *windows.GUID, ifname string) error {
|
||||
// Open network interface registry key.
|
||||
key, err := registry.OpenKey(registry.LOCAL_MACHINE, fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guidToString(&deviceClassNetGUID), guidToString(ifid)), registry.SET_VALUE)
|
||||
if err != nil {
|
||||
return errors.New("Network-specific registry key open failed: " + err.Error())
|
||||
}
|
||||
defer key.Close()
|
||||
|
||||
// Set the interface name.
|
||||
return key.SetStringValue("Name", ifname)
|
||||
}
|
||||
|
||||
//sys clsidFromString(lpsz *uint16, pclsid *windows.GUID) (hr int32) = ole32.CLSIDFromString
|
||||
|
||||
//
|
||||
// stringToGUID parses "{XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}" string to GUID.
|
||||
//
|
||||
func stringToGUID(str string) (*windows.GUID, error) {
|
||||
strUTF16, err := syscall.UTF16PtrFromString(str)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
guid := &windows.GUID{}
|
||||
|
||||
hr := clsidFromString(strUTF16, guid)
|
||||
if hr < 0 {
|
||||
return nil, syscall.Errno(hr)
|
||||
}
|
||||
|
||||
return guid, nil
|
||||
}
|
||||
|
||||
//
|
||||
// guidToString function converts GUID to string
|
||||
// "{XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}".
|
||||
//
|
||||
// The resulting string is uppercase.
|
||||
//
|
||||
func guidToString(guid *windows.GUID) string {
|
||||
return fmt.Sprintf("{%06X-%04X-%04X-%04X-%012X}", guid.Data1, guid.Data2, guid.Data3, guid.Data4[:2], guid.Data4[2:])
|
||||
}
|
||||
|
||||
//
|
||||
// getRegStringValue function reads a string value from registry.
|
||||
//
|
||||
// If the value type is REG_EXPAND_SZ the environment variables are expanded.
|
||||
// Should expanding fail, original string value and nil error are returned.
|
||||
//
|
||||
func getRegStringValue(key registry.Key, name string) (string, error) {
|
||||
// Read string value.
|
||||
value, valueType, err := key.GetStringValue(name)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
if valueType != registry.EXPAND_SZ {
|
||||
// Value does not require expansion.
|
||||
return value, nil
|
||||
}
|
||||
|
||||
valueExp, err := registry.ExpandString(value)
|
||||
if err != nil {
|
||||
// Expanding failed: return original sting value.
|
||||
return value, nil
|
||||
}
|
||||
|
||||
// Return expanded value.
|
||||
return valueExp, nil
|
||||
}
|
||||
|
|
|
|||
49
tun/ztun_windows.go
Normal file
49
tun/ztun_windows.go
Normal file
|
|
@ -0,0 +1,49 @@
|
|||
// Code generated by 'go generate'; DO NOT EDIT.
|
||||
|
||||
package tun
|
||||
|
||||
import (
|
||||
"syscall"
|
||||
"unsafe"
|
||||
|
||||
"golang.org/x/sys/windows"
|
||||
)
|
||||
|
||||
var _ unsafe.Pointer
|
||||
|
||||
// Do the interface allocations only once for common
|
||||
// Errno values.
|
||||
const (
|
||||
errnoERROR_IO_PENDING = 997
|
||||
)
|
||||
|
||||
var (
|
||||
errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
|
||||
)
|
||||
|
||||
// errnoErr returns common boxed Errno values, to prevent
|
||||
// allocations at runtime.
|
||||
func errnoErr(e syscall.Errno) error {
|
||||
switch e {
|
||||
case 0:
|
||||
return nil
|
||||
case errnoERROR_IO_PENDING:
|
||||
return errERROR_IO_PENDING
|
||||
}
|
||||
// TODO: add more here, after collecting data on the common
|
||||
// error values see on Windows. (perhaps when running
|
||||
// all.bat?)
|
||||
return e
|
||||
}
|
||||
|
||||
var (
|
||||
modole32 = windows.NewLazySystemDLL("ole32.dll")
|
||||
|
||||
procCLSIDFromString = modole32.NewProc("CLSIDFromString")
|
||||
)
|
||||
|
||||
func clsidFromString(lpsz *uint16, pclsid *windows.GUID) (hr int32) {
|
||||
r0, _, _ := syscall.Syscall(procCLSIDFromString.Addr(), 2, uintptr(unsafe.Pointer(lpsz)), uintptr(unsafe.Pointer(pclsid)), 0)
|
||||
hr = int32(r0)
|
||||
return
|
||||
}
|
||||
Loading…
Reference in a new issue