wireguard-go/tun/wintun/wintun_windows.go

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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package wintun
import (
"errors"
"fmt"
"strings"
"syscall"
"time"
"unsafe"
"golang.org/x/sys/windows"
"golang.org/x/sys/windows/registry"
"golang.zx2c4.com/wireguard/tun/wintun/guid"
"golang.zx2c4.com/wireguard/tun/wintun/setupapi"
)
//
// Wintun is a handle of a Wintun adapter
//
type Wintun windows.GUID
var deviceClassNetGUID = windows.GUID{Data1: 0x4d36e972, Data2: 0xe325, Data3: 0x11ce, Data4: [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
const hardwareID = "Wintun"
const enumerator = ""
const machineName = ""
//
// GetInterface finds interface ID by name.
//
// hwndParent is a handle to the top-level window to use for any user
// interface that is related to non-device-specific actions (such as a select-
// device dialog box that uses the global class driver list). This handle is
// optional and can be 0. If a specific top-level window is not required, set
// hwndParent to 0.
//
// Function returns interface ID when the interface was found, or nil
// otherwise. If the interface is found but not Wintun-class, the function
// returns interface ID with an error.
//
func GetInterface(ifname string, hwndParent uintptr) (*Wintun, error) {
// Create a list of network devices.
devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, enumerator, hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), machineName)
if err != nil {
return nil, err
}
defer devInfoList.Close()
// Windows requires each interface to have a different name. When
// enforcing this, Windows treats interface names case-insensitive. If an
// interface "FooBar" exists and this function reports there is no
// interface "foobar", an attempt to create a new interface and name it
// "foobar" would cause conflict with "FooBar".
ifname = strings.ToLower(ifname)
// Iterate.
for index := 0; ; index++ {
// Get the device from the list. Should anything be wrong with this device, continue with next.
deviceData, err := devInfoList.EnumDeviceInfo(index)
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
break
}
continue
}
// Get interface ID.
ifid, err := devInfoList.GetInterfaceID(deviceData)
if err != nil {
continue
}
// Get interface name.
ifname2, err := ((*Wintun)(ifid)).GetInterfaceName()
if err != nil {
continue
}
if ifname == strings.ToLower(ifname2) {
// Interface name found. Check its driver.
const driverType = setupapi.SPDIT_COMPATDRIVER
err = devInfoList.BuildDriverInfoList(deviceData, driverType)
if err != nil {
return nil, err
}
defer devInfoList.DestroyDriverInfoList(deviceData, driverType)
for index := 0; ; index++ {
// Get a driver from the list.
driverData, err := devInfoList.EnumDriverInfo(deviceData, driverType, index)
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
break
}
// Something is wrong with this driver. Skip it.
continue
}
// Get driver info details.
driverDetailData, err := devInfoList.GetDriverInfoDetail(deviceData, driverData)
if err != nil {
// Something is wrong with this driver. Skip it.
continue
}
if driverDetailData.IsCompatible(hardwareID) {
// Matching hardware ID found.
return (*Wintun)(ifid), nil
}
}
// This interface is not using Wintun driver.
return (*Wintun)(ifid), errors.New("Foreign network interface with the same name exists")
}
}
return nil, nil
}
//
// CreateInterface creates a TUN interface.
//
// description is a string that supplies the text description of the device.
// description is optional and can be "".
//
// hwndParent is a handle to the top-level window to use for any user
// interface that is related to non-device-specific actions (such as a select-
// device dialog box that uses the global class driver list). This handle is
// optional and can be 0. If a specific top-level window is not required, set
// hwndParent to 0.
//
// Function returns the network interface ID and a flag if reboot is required.
//
func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, error) {
// Create an empty device info set for network adapter device class.
devInfoList, err := setupapi.SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, hwndParent, machineName)
if err != nil {
return nil, false, err
}
// Get the device class name from GUID.
className, err := setupapi.SetupDiClassNameFromGuidEx(&deviceClassNetGUID, machineName)
if err != nil {
return nil, false, err
}
// Create a new device info element and add it to the device info set.
deviceData, err := devInfoList.CreateDeviceInfo(className, &deviceClassNetGUID, description, hwndParent, setupapi.DICD_GENERATE_ID)
if err != nil {
return nil, false, err
}
// Set a device information element as the selected member of a device information set.
err = devInfoList.SetSelectedDevice(deviceData)
if err != nil {
return nil, false, err
}
// Set Plug&Play device hardware ID property.
hwid, err := syscall.UTF16FromString(hardwareID)
if err != nil {
return nil, false, err
}
err = devInfoList.SetDeviceRegistryProperty(deviceData, setupapi.SPDRP_HARDWAREID, setupapi.UTF16ToBuf(append(hwid, 0)))
if err != nil {
return nil, false, err
}
// Search for the driver.
const driverType = setupapi.SPDIT_CLASSDRIVER
err = devInfoList.BuildDriverInfoList(deviceData, driverType)
if err != nil {
return nil, false, err
}
defer devInfoList.DestroyDriverInfoList(deviceData, driverType)
driverDate := windows.Filetime{}
driverVersion := uint64(0)
for index := 0; ; index++ {
// Get a driver from the list.
driverData, err := devInfoList.EnumDriverInfo(deviceData, driverType, index)
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
break
}
// Something is wrong with this driver. Skip it.
continue
}
// 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.
if driverData.IsNewer(driverDate, driverVersion) {
// Get driver info details.
driverDetailData, err := devInfoList.GetDriverInfoDetail(deviceData, driverData)
if err != nil {
// Something is wrong with this driver. Skip it.
continue
}
if driverDetailData.IsCompatible(hardwareID) {
// Matching hardware ID found. Select the driver.
err := devInfoList.SetSelectedDriver(deviceData, driverData)
if err != nil {
// Something is wrong with this driver. Skip it.
continue
}
driverDate = driverData.DriverDate
driverVersion = driverData.DriverVersion
}
}
}
if driverVersion == 0 {
return nil, false, fmt.Errorf("No driver for device \"%v\" installed", hardwareID)
}
// Call appropriate class installer.
err = devInfoList.CallClassInstaller(setupapi.DIF_REGISTERDEVICE, deviceData)
if err != nil {
return nil, false, err
}
// Register device co-installers if any.
devInfoList.CallClassInstaller(setupapi.DIF_REGISTER_COINSTALLERS, deviceData)
// Install interfaces if any.
devInfoList.CallClassInstaller(setupapi.DIF_INSTALLINTERFACES, deviceData)
var wintun *Wintun
var rebootRequired bool
// Install the device.
err = devInfoList.CallClassInstaller(setupapi.DIF_INSTALLDEVICE, deviceData)
if err == nil {
// Check if a system reboot is required. (Ignore errors)
if ret, _ := checkReboot(devInfoList, deviceData); ret {
rebootRequired = true
}
// Get network interface. DIF_INSTALLDEVICE returns almost immediately, while the device
// installation continues in the background. It might take a while, before all registry
// keys and values are populated.
getInterface := func() (*Wintun, error) {
// Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\<class>\<id> registry key.
keyDev, err := devInfoList.OpenDevRegKey(deviceData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.READ)
if err != nil {
return nil, errors.New("Device-specific registry key open failed: " + err.Error())
}
defer keyDev.Close()
// Read the NetCfgInstanceId value.
value, err := getRegStringValue(keyDev, "NetCfgInstanceId")
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_FILE_NOT_FOUND {
return nil, err
}
return nil, errors.New("RegQueryStringValue(\"NetCfgInstanceId\") failed: " + err.Error())
}
// Convert to windows.GUID.
ifid, err := guid.FromString(value)
if err != nil {
return nil, fmt.Errorf("NetCfgInstanceId registry value is not a GUID (expected: \"{...}\", provided: \"%v\")", value)
}
wintun := (*Wintun)(ifid)
keyNetName := wintun.GetNetRegKeyName()
keyNet, err := registry.OpenKey(registry.LOCAL_MACHINE, keyNetName, registry.QUERY_VALUE)
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_FILE_NOT_FOUND {
return nil, err
}
return nil, errors.New(fmt.Sprintf("RegOpenKeyEx(\"%v\") failed: ", keyNetName) + err.Error())
}
defer keyNet.Close()
// Query the interface name.
_, valueType, err := keyNet.GetValue("Name", nil)
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_FILE_NOT_FOUND {
return nil, err
}
return nil, errors.New("RegQueryValueEx(\"Name\") failed: " + err.Error())
}
switch valueType {
case registry.SZ, registry.EXPAND_SZ:
default:
return nil, fmt.Errorf("Interface name registry value is not REG_SZ or REG_EXPAND_SZ (expected: %v or %v, provided: %v)", registry.SZ, registry.EXPAND_SZ, valueType)
}
// TUN interface is ready. (As much as we need it.)
return wintun, nil
}
for numAttempts := 0; numAttempts < 30; numAttempts++ {
wintun, err = getInterface()
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_FILE_NOT_FOUND {
// Wait and retry. TODO: Wait for a cancellable event instead.
time.Sleep(time.Second)
continue
}
}
break
}
}
if err == nil {
return wintun, rebootRequired, nil
}
// The interface failed to install, or the interface ID was unobtainable. Clean-up.
removeDeviceParams := setupapi.RemoveDeviceParams{
ClassInstallHeader: *setupapi.MakeClassInstallHeader(setupapi.DIF_REMOVE),
Scope: setupapi.DI_REMOVEDEVICE_GLOBAL,
}
// Set class installer parameters for DIF_REMOVE.
if devInfoList.SetClassInstallParams(deviceData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams))) == nil {
// Call appropriate class installer.
if devInfoList.CallClassInstaller(setupapi.DIF_REMOVE, deviceData) == nil {
// Check if a system reboot is required. (Ignore errors)
if ret, _ := checkReboot(devInfoList, deviceData); ret {
rebootRequired = true
}
}
}
return nil, false, err
}
//
// DeleteInterface deletes a TUN interface.
//
// hwndParent is a handle to the top-level window to use for any user
// interface that is related to non-device-specific actions (such as a select-
// device dialog box that uses the global class driver list). This handle is
// optional and can be 0. If a specific top-level window is not required, set
// hwndParent to 0.
//
// Function returns true if the interface was found and deleted and a flag if
// reboot is required.
//
func (wintun *Wintun) DeleteInterface(hwndParent uintptr) (bool, bool, error) {
ifid := (*windows.GUID)(wintun)
// Create a list of network devices.
devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, enumerator, hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), machineName)
if err != nil {
return false, false, err
}
defer devInfoList.Close()
// Iterate.
for index := 0; ; index++ {
// Get the device from the list. Should anything be wrong with this device, continue with next.
deviceData, err := devInfoList.EnumDeviceInfo(index)
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
break
}
continue
}
// Get interface ID.
ifid2, err := devInfoList.GetInterfaceID(deviceData)
if err != nil {
continue
}
if *ifid == *ifid2 {
// Remove the device.
removeDeviceParams := setupapi.RemoveDeviceParams{
ClassInstallHeader: *setupapi.MakeClassInstallHeader(setupapi.DIF_REMOVE),
Scope: setupapi.DI_REMOVEDEVICE_GLOBAL,
}
// Set class installer parameters for DIF_REMOVE.
err = devInfoList.SetClassInstallParams(deviceData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams)))
if err != nil {
return false, false, err
}
// Call appropriate class installer.
err = devInfoList.CallClassInstaller(setupapi.DIF_REMOVE, deviceData)
if err != nil {
return false, false, err
}
// Check if a system reboot is required. (Ignore errors)
if ret, _ := checkReboot(devInfoList, deviceData); ret {
return true, true, nil
}
return true, false, nil
}
}
return false, false, nil
}
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//
// FlushInterface removes all properties from the interface and gives it only a very
// vanilla IPv4 and IPv6 configuration with no addresses of any sort assigned.
//
func (wintun *Wintun) FlushInterface() error {
//TODO: implement me!
return nil
}
//
// checkReboot checks device install parameters if a system reboot is required.
//
func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) (bool, error) {
devInstallParams, err := deviceInfoSet.GetDeviceInstallParams(deviceInfoData)
if err != nil {
return false, err
}
if (devInstallParams.Flags & (setupapi.DI_NEEDREBOOT | setupapi.DI_NEEDRESTART)) != 0 {
return true, nil
}
return false, nil
}
//
// GetInterfaceName returns network interface name.
//
func (wintun *Wintun) GetInterfaceName() (string, error) {
key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.GetNetRegKeyName(), 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 (wintun *Wintun) SetInterfaceName(ifname string) error {
key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.GetNetRegKeyName(), 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)
}
//
// GetNetRegKeyName returns interface-specific network registry key name.
//
func (wintun *Wintun) GetNetRegKeyName() string {
ifid := (*windows.GUID)(wintun)
return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guid.ToString(&deviceClassNetGUID), guid.ToString(ifid))
}
//
// 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
}
//
// SignalEventName returns Wintun device data-ready event name.
//
func (wintun *Wintun) SignalEventName() string {
return fmt.Sprintf("Global\\WINTUN_EVENT_%s", guid.ToString((*windows.GUID)(wintun)))
}
//
// DataFileName returns Wintun device data pipe name.
//
func (wintun *Wintun) DataFileName() string {
return fmt.Sprintf("\\\\.\\Global\\WINTUN_DEVICE_%s", guid.ToString((*windows.GUID)(wintun)))
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}