wintun: Introduce new package for obscuring Windows bits

10 files changed, 2459 insertions, 0 deletions

diff --git a/tun/wintun/guid/guid_windows.go b/tun/wintun/guid/guid_windows.go
new file mode 100644
index 0000000..0078d2c
--- /dev/null
+++ b/tun/wintun/guid/guid_windows.go
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package guid
+
+import (
+	"fmt"
+	"syscall"
+
+	"golang.org/x/sys/windows"
+)
+
+//sys	clsidFromString(lpsz *uint16, pclsid *windows.GUID) (hr int32) = ole32.CLSIDFromString
+
+//
+// FromString parses "{XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}" string to GUID.
+//
+func FromString(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
+}
+
+//
+// ToString function converts GUID to string
+// "{XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}".
+//
+// The resulting string is uppercase.
+//
+func ToString(guid *windows.GUID) string {
+	return fmt.Sprintf("{%06X-%04X-%04X-%04X-%012X}", guid.Data1, guid.Data2, guid.Data3, guid.Data4[:2], guid.Data4[2:])
+}
diff --git a/tun/wintun/guid/mksyscall.go b/tun/wintun/guid/mksyscall.go
new file mode 100644
index 0000000..5c956cf
--- /dev/null
+++ b/tun/wintun/guid/mksyscall.go
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package guid
+
+//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zguid_windows.go guid_windows.go
diff --git a/tun/wintun/guid/zguid_windows.go b/tun/wintun/guid/zguid_windows.go
new file mode 100644
index 0000000..5467849
--- /dev/null
+++ b/tun/wintun/guid/zguid_windows.go
@@ -0,0 +1,49 @@
+// Code generated by 'go generate'; DO NOT EDIT.
+
+package guid
+
+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
+}
diff --git a/tun/wintun/setupapi/mksyscall.go b/tun/wintun/setupapi/mksyscall.go
new file mode 100644
index 0000000..3447dee
--- /dev/null
+++ b/tun/wintun/setupapi/mksyscall.go
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package setupapi
+
+//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsetupapi_windows.go setupapi_windows.go
diff --git a/tun/wintun/setupapi/setupapi_windows.go b/tun/wintun/setupapi/setupapi_windows.go
new file mode 100644
index 0000000..72d4bd8
--- /dev/null
+++ b/tun/wintun/setupapi/setupapi_windows.go
@@ -0,0 +1,476 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package setupapi
+
+import (
+	"encoding/binary"
+	"fmt"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+	"golang.org/x/sys/windows/registry"
+)
+
+//sys	setupDiCreateDeviceInfoListEx(classGUID *windows.GUID, hwndParent uintptr, machineName *uint16, reserved uintptr) (handle DevInfo, err error) [failretval==DevInfo(windows.InvalidHandle)] = setupapi.SetupDiCreateDeviceInfoListExW
+
+// SetupDiCreateDeviceInfoListEx function creates an empty device information set on a remote or a local computer and optionally associates the set with a device setup class.
+func SetupDiCreateDeviceInfoListEx(classGUID *windows.GUID, hwndParent uintptr, machineName string) (deviceInfoSet DevInfo, err error) {
+	var machineNameUTF16 *uint16
+	if machineName != "" {
+		machineNameUTF16, err = syscall.UTF16PtrFromString(machineName)
+		if err != nil {
+			return
+		}
+	}
+	return setupDiCreateDeviceInfoListEx(classGUID, hwndParent, machineNameUTF16, 0)
+}
+
+//sys	setupDiGetDeviceInfoListDetail(deviceInfoSet DevInfo, deviceInfoSetDetailData *_SP_DEVINFO_LIST_DETAIL_DATA) (err error) = setupapi.SetupDiGetDeviceInfoListDetailW
+
+// SetupDiGetDeviceInfoListDetail function retrieves information associated with a device information set including the class GUID, remote computer handle, and remote computer name.
+func SetupDiGetDeviceInfoListDetail(deviceInfoSet DevInfo) (deviceInfoSetDetailData *DevInfoListDetailData, err error) {
+	var _data _SP_DEVINFO_LIST_DETAIL_DATA
+	_data.Size = uint32(unsafe.Sizeof(_data))
+
+	err = setupDiGetDeviceInfoListDetail(deviceInfoSet, &_data)
+	if err != nil {
+		return
+	}
+
+	return _data.toGo(), nil
+}
+
+// GetDeviceInfoListDetail method retrieves information associated with a device information set including the class GUID, remote computer handle, and remote computer name.
+func (deviceInfoSet DevInfo) GetDeviceInfoListDetail() (*DevInfoListDetailData, error) {
+	return SetupDiGetDeviceInfoListDetail(deviceInfoSet)
+}
+
+//sys	setupDiCreateDeviceInfo(deviceInfoSet DevInfo, DeviceName *uint16, classGUID *windows.GUID, DeviceDescription *uint16, hwndParent uintptr, CreationFlags DICD, deviceInfoData *SP_DEVINFO_DATA) (err error) = setupapi.SetupDiCreateDeviceInfoW
+
+// SetupDiCreateDeviceInfo function creates a new device information element and adds it as a new member to the specified device information set.
+func SetupDiCreateDeviceInfo(deviceInfoSet DevInfo, deviceName string, classGUID *windows.GUID, deviceDescription string, hwndParent uintptr, creationFlags DICD) (deviceInfoData *SP_DEVINFO_DATA, err error) {
+	deviceNameUTF16, err := syscall.UTF16PtrFromString(deviceName)
+	if err != nil {
+		return
+	}
+
+	var deviceDescriptionUTF16 *uint16
+	if deviceDescription != "" {
+		deviceDescriptionUTF16, err = syscall.UTF16PtrFromString(deviceDescription)
+		if err != nil {
+			return
+		}
+	}
+
+	data := SP_DEVINFO_DATA{}
+	data.Size = uint32(unsafe.Sizeof(data))
+
+	return &data, setupDiCreateDeviceInfo(deviceInfoSet, deviceNameUTF16, classGUID, deviceDescriptionUTF16, hwndParent, creationFlags, &data)
+}
+
+// CreateDeviceInfo method creates a new device information element and adds it as a new member to the specified device information set.
+func (deviceInfoSet DevInfo) CreateDeviceInfo(deviceName string, classGUID *windows.GUID, deviceDescription string, hwndParent uintptr, creationFlags DICD) (*SP_DEVINFO_DATA, error) {
+	return SetupDiCreateDeviceInfo(deviceInfoSet, deviceName, classGUID, deviceDescription, hwndParent, creationFlags)
+}
+
+//sys	setupDiEnumDeviceInfo(deviceInfoSet DevInfo, memberIndex uint32, deviceInfoData *SP_DEVINFO_DATA) (err error) = setupapi.SetupDiEnumDeviceInfo
+
+// SetupDiEnumDeviceInfo function returns a SP_DEVINFO_DATA structure that specifies a device information element in a device information set.
+func SetupDiEnumDeviceInfo(deviceInfoSet DevInfo, memberIndex int) (*SP_DEVINFO_DATA, error) {
+	data := SP_DEVINFO_DATA{}
+	data.Size = uint32(unsafe.Sizeof(data))
+
+	return &data, setupDiEnumDeviceInfo(deviceInfoSet, uint32(memberIndex), &data)
+}
+
+// EnumDeviceInfo method returns a SP_DEVINFO_DATA structure that specifies a device information element in a device information set.
+func (deviceInfoSet DevInfo) EnumDeviceInfo(memberIndex int) (*SP_DEVINFO_DATA, error) {
+	return SetupDiEnumDeviceInfo(deviceInfoSet, memberIndex)
+}
+
+// SetupDiDestroyDeviceInfoList function deletes a device information set and frees all associated memory.
+//sys	SetupDiDestroyDeviceInfoList(deviceInfoSet DevInfo) (err error) = setupapi.SetupDiDestroyDeviceInfoList
+
+// Close method deletes a device information set and frees all associated memory.
+func (deviceInfoSet DevInfo) Close() error {
+	return SetupDiDestroyDeviceInfoList(deviceInfoSet)
+}
+
+//sys	SetupDiBuildDriverInfoList(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT) (err error) = setupapi.SetupDiBuildDriverInfoList
+
+// BuildDriverInfoList method builds a list of drivers that is associated with a specific device or with the global class driver list for a device information set.
+func (deviceInfoSet DevInfo) BuildDriverInfoList(deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT) error {
+	return SetupDiBuildDriverInfoList(deviceInfoSet, deviceInfoData, driverType)
+}
+
+//sys	SetupDiCancelDriverInfoSearch(deviceInfoSet DevInfo) (err error) = setupapi.SetupDiCancelDriverInfoSearch
+
+// CancelDriverInfoSearch method cancels a driver list search that is currently in progress in a different thread.
+func (deviceInfoSet DevInfo) CancelDriverInfoSearch() error {
+	return SetupDiCancelDriverInfoSearch(deviceInfoSet)
+}
+
+//sys	setupDiEnumDriverInfo(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT, memberIndex uint32, driverInfoData *SP_DRVINFO_DATA) (err error) = setupapi.SetupDiEnumDriverInfoW
+
+// SetupDiEnumDriverInfo function enumerates the members of a driver list.
+func SetupDiEnumDriverInfo(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT, memberIndex int) (*SP_DRVINFO_DATA, error) {
+	data := &SP_DRVINFO_DATA{}
+	data.Size = uint32(unsafe.Sizeof(*data))
+
+	return data, setupDiEnumDriverInfo(deviceInfoSet, deviceInfoData, driverType, uint32(memberIndex), data)
+}
+
+// EnumDriverInfo method enumerates the members of a driver list.
+func (deviceInfoSet DevInfo) EnumDriverInfo(deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT, memberIndex int) (*SP_DRVINFO_DATA, error) {
+	return SetupDiEnumDriverInfo(deviceInfoSet, deviceInfoData, driverType, memberIndex)
+}
+
+//sys	setupDiGetSelectedDriver(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverInfoData *SP_DRVINFO_DATA) (err error) = setupapi.SetupDiGetSelectedDriverW
+
+// SetupDiGetSelectedDriver function retrieves the selected driver for a device information set or a particular device information element.
+func SetupDiGetSelectedDriver(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA) (*SP_DRVINFO_DATA, error) {
+	data := &SP_DRVINFO_DATA{}
+	data.Size = uint32(unsafe.Sizeof(*data))
+
+	return data, setupDiGetSelectedDriver(deviceInfoSet, deviceInfoData, data)
+}
+
+// GetSelectedDriver method retrieves the selected driver for a device information set or a particular device information element.
+func (deviceInfoSet DevInfo) GetSelectedDriver(deviceInfoData *SP_DEVINFO_DATA) (*SP_DRVINFO_DATA, error) {
+	return SetupDiGetSelectedDriver(deviceInfoSet, deviceInfoData)
+}
+
+//sys	SetupDiSetSelectedDriver(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverInfoData *SP_DRVINFO_DATA) (err error) = setupapi.SetupDiSetSelectedDriverW
+
+// SetSelectedDriver method sets, or resets, the selected driver for a device information element or the selected class driver for a device information set.
+func (deviceInfoSet DevInfo) SetSelectedDriver(deviceInfoData *SP_DEVINFO_DATA, driverInfoData *SP_DRVINFO_DATA) error {
+	return SetupDiSetSelectedDriver(deviceInfoSet, deviceInfoData, driverInfoData)
+}
+
+//sys	setupDiGetDriverInfoDetail(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverInfoData *SP_DRVINFO_DATA, driverInfoDetailData *_SP_DRVINFO_DETAIL_DATA, driverInfoDetailDataSize uint32, requiredSize *uint32) (err error) = setupapi.SetupDiGetDriverInfoDetailW
+
+// SetupDiGetDriverInfoDetail function retrieves driver information detail for a device information set or a particular device information element in the device information set.
+func SetupDiGetDriverInfoDetail(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverInfoData *SP_DRVINFO_DATA) (driverInfoDetailData *DrvInfoDetailData, err error) {
+	const bufCapacity = 0x800
+	buf := [bufCapacity]byte{}
+	var bufLen uint32
+
+	_data := (*_SP_DRVINFO_DETAIL_DATA)(unsafe.Pointer(&buf[0]))
+	_data.Size = uint32(unsafe.Sizeof(*_data))
+
+	err = setupDiGetDriverInfoDetail(deviceInfoSet, deviceInfoData, driverInfoData, _data, bufCapacity, &bufLen)
+	if err == nil {
+		// The buffer was was sufficiently big.
+		return _data.toGo(bufLen), nil
+	}
+
+	if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_INSUFFICIENT_BUFFER {
+		// The buffer was too small. Now that we got the required size, create another one big enough and retry.
+		buf := make([]byte, bufLen)
+		_data := (*_SP_DRVINFO_DETAIL_DATA)(unsafe.Pointer(&buf[0]))
+		_data.Size = uint32(unsafe.Sizeof(*_data))
+
+		err = setupDiGetDriverInfoDetail(deviceInfoSet, deviceInfoData, driverInfoData, _data, bufLen, &bufLen)
+		if err == nil {
+			return _data.toGo(bufLen), nil
+		}
+	}
+
+	return
+}
+
+// GetDriverInfoDetail method retrieves driver information detail for a device information set or a particular device information element in the device information set.
+func (deviceInfoSet DevInfo) GetDriverInfoDetail(deviceInfoData *SP_DEVINFO_DATA, driverInfoData *SP_DRVINFO_DATA) (*DrvInfoDetailData, error) {
+	return SetupDiGetDriverInfoDetail(deviceInfoSet, deviceInfoData, driverInfoData)
+}
+
+//sys	SetupDiDestroyDriverInfoList(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT) (err error) = setupapi.SetupDiDestroyDriverInfoList
+
+// DestroyDriverInfoList method deletes a driver list.
+func (deviceInfoSet DevInfo) DestroyDriverInfoList(deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT) error {
+	return SetupDiDestroyDriverInfoList(deviceInfoSet, deviceInfoData, driverType)
+}
+
+//sys	setupDiGetClassDevsEx(classGUID *windows.GUID, Enumerator *uint16, hwndParent uintptr, Flags DIGCF, deviceInfoSet DevInfo, machineName *uint16, reserved uintptr) (handle DevInfo, err error) [failretval==DevInfo(windows.InvalidHandle)] = setupapi.SetupDiGetClassDevsExW
+
+// SetupDiGetClassDevsEx function returns a handle to a device information set that contains requested device information elements for a local or a remote computer.
+func SetupDiGetClassDevsEx(classGUID *windows.GUID, enumerator string, hwndParent uintptr, flags DIGCF, deviceInfoSet DevInfo, machineName string) (handle DevInfo, err error) {
+	var enumeratorUTF16 *uint16
+	if enumerator != "" {
+		enumeratorUTF16, err = syscall.UTF16PtrFromString(enumerator)
+		if err != nil {
+			return
+		}
+	}
+	var machineNameUTF16 *uint16
+	if machineName != "" {
+		machineNameUTF16, err = syscall.UTF16PtrFromString(machineName)
+		if err != nil {
+			return
+		}
+	}
+	return setupDiGetClassDevsEx(classGUID, enumeratorUTF16, hwndParent, flags, deviceInfoSet, machineNameUTF16, 0)
+}
+
+// SetupDiCallClassInstaller function calls the appropriate class installer, and any registered co-installers, with the specified installation request (DIF code).
+//sys	SetupDiCallClassInstaller(installFunction DI_FUNCTION, deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA) (err error) = setupapi.SetupDiCallClassInstaller
+
+// CallClassInstaller member calls the appropriate class installer, and any registered co-installers, with the specified installation request (DIF code).
+func (deviceInfoSet DevInfo) CallClassInstaller(installFunction DI_FUNCTION, deviceInfoData *SP_DEVINFO_DATA) error {
+	return SetupDiCallClassInstaller(installFunction, deviceInfoSet, deviceInfoData)
+}
+
+//sys	setupDiOpenDevRegKey(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, Scope DICS_FLAG, HwProfile uint32, KeyType DIREG, samDesired uint32) (key windows.Handle, err error) [failretval==windows.InvalidHandle] = setupapi.SetupDiOpenDevRegKey
+
+// SetupDiOpenDevRegKey function opens a registry key for device-specific configuration information.
+func SetupDiOpenDevRegKey(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, scope DICS_FLAG, hwProfile uint32, keyType DIREG, samDesired uint32) (registry.Key, error) {
+	handle, err := setupDiOpenDevRegKey(deviceInfoSet, deviceInfoData, scope, hwProfile, keyType, samDesired)
+	return registry.Key(handle), err
+}
+
+// OpenDevRegKey method opens a registry key for device-specific configuration information.
+func (deviceInfoSet DevInfo) OpenDevRegKey(DeviceInfoData *SP_DEVINFO_DATA, Scope DICS_FLAG, HwProfile uint32, KeyType DIREG, samDesired uint32) (registry.Key, error) {
+	return SetupDiOpenDevRegKey(deviceInfoSet, DeviceInfoData, Scope, HwProfile, KeyType, samDesired)
+}
+
+//sys	setupDiGetDeviceRegistryProperty(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, property SPDRP, propertyRegDataType *uint32, propertyBuffer *byte, propertyBufferSize uint32, requiredSize *uint32) (err error) = setupapi.SetupDiGetDeviceRegistryPropertyW
+
+// SetupDiGetDeviceRegistryProperty function retrieves a specified Plug and Play device property.
+func SetupDiGetDeviceRegistryProperty(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, property SPDRP) (value interface{}, err error) {
+	buf := make([]byte, 0x100)
+	var dataType, bufLen uint32
+	err = setupDiGetDeviceRegistryProperty(deviceInfoSet, deviceInfoData, property, &dataType, &buf[0], uint32(cap(buf)), &bufLen)
+	if err == nil {
+		// The buffer was sufficiently big.
+		return getRegistryValue(buf[:bufLen], dataType)
+	}
+
+	if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_INSUFFICIENT_BUFFER {
+		// The buffer was too small. Now that we got the required size, create another one big enough and retry.
+		buf = make([]byte, bufLen)
+		err = setupDiGetDeviceRegistryProperty(deviceInfoSet, deviceInfoData, property, &dataType, &buf[0], uint32(cap(buf)), &bufLen)
+		if err == nil {
+			return getRegistryValue(buf[:bufLen], dataType)
+		}
+	}
+
+	return
+}
+
+func getRegistryValue(buf []byte, dataType uint32) (interface{}, error) {
+	switch dataType {
+	case windows.REG_SZ:
+		return windows.UTF16ToString(BufToUTF16(buf)), nil
+	case windows.REG_EXPAND_SZ:
+		return registry.ExpandString(windows.UTF16ToString(BufToUTF16(buf)))
+	case windows.REG_BINARY:
+		return buf, nil
+	case windows.REG_DWORD_LITTLE_ENDIAN:
+		return binary.LittleEndian.Uint32(buf), nil
+	case windows.REG_DWORD_BIG_ENDIAN:
+		return binary.BigEndian.Uint32(buf), nil
+	case windows.REG_MULTI_SZ:
+		bufW := BufToUTF16(buf)
+		a := []string{}
+		for i := 0; i < len(bufW); {
+			j := i + wcslen(bufW[i:])
+			if i < j {
+				a = append(a, windows.UTF16ToString(bufW[i:j]))
+			}
+			i = j + 1
+		}
+		return a, nil
+	case windows.REG_QWORD_LITTLE_ENDIAN:
+		return binary.LittleEndian.Uint64(buf), nil
+	default:
+		return nil, fmt.Errorf("Unsupported registry value type: %v", dataType)
+	}
+}
+
+// BufToUTF16 function reinterprets []byte buffer as []uint16
+func BufToUTF16(buf []byte) []uint16 {
+	sl := struct {
+		addr *uint16
+		len  int
+		cap  int
+	}{(*uint16)(unsafe.Pointer(&buf[0])), len(buf) / 2, cap(buf) / 2}
+	return *(*[]uint16)(unsafe.Pointer(&sl))
+}
+
+// UTF16ToBuf function reinterprets []uint16 as []byte
+func UTF16ToBuf(buf []uint16) []byte {
+	sl := struct {
+		addr *byte
+		len  int
+		cap  int
+	}{(*byte)(unsafe.Pointer(&buf[0])), len(buf) * 2, cap(buf) * 2}
+	return *(*[]byte)(unsafe.Pointer(&sl))
+}
+
+func wcslen(str []uint16) int {
+	for i := 0; i < len(str); i++ {
+		if str[i] == 0 {
+			return i
+		}
+	}
+	return len(str)
+}
+
+// GetDeviceRegistryProperty method retrieves a specified Plug and Play device property.
+func (deviceInfoSet DevInfo) GetDeviceRegistryProperty(deviceInfoData *SP_DEVINFO_DATA, property SPDRP) (interface{}, error) {
+	return SetupDiGetDeviceRegistryProperty(deviceInfoSet, deviceInfoData, property)
+}
+
+//sys	setupDiSetDeviceRegistryProperty(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, property SPDRP, propertyBuffer *byte, propertyBufferSize uint32) (err error) = setupapi.SetupDiSetDeviceRegistryPropertyW
+
+// SetupDiSetDeviceRegistryProperty function sets a Plug and Play device property for a device.
+func SetupDiSetDeviceRegistryProperty(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, property SPDRP, propertyBuffers []byte) error {
+	return setupDiSetDeviceRegistryProperty(deviceInfoSet, deviceInfoData, property, &propertyBuffers[0], uint32(len(propertyBuffers)))
+}
+
+// SetDeviceRegistryProperty function sets a Plug and Play device property for a device.
+func (deviceInfoSet DevInfo) SetDeviceRegistryProperty(deviceInfoData *SP_DEVINFO_DATA, property SPDRP, propertyBuffers []byte) error {
+	return SetupDiSetDeviceRegistryProperty(deviceInfoSet, deviceInfoData, property, propertyBuffers)
+}
+
+//sys	setupDiGetDeviceInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, deviceInstallParams *_SP_DEVINSTALL_PARAMS) (err error) = setupapi.SetupDiGetDeviceInstallParamsW
+
+// SetupDiGetDeviceInstallParams function retrieves device installation parameters for a device information set or a particular device information element.
+func SetupDiGetDeviceInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA) (deviceInstallParams *DevInstallParams, err error) {
+	var _data _SP_DEVINSTALL_PARAMS
+	_data.Size = uint32(unsafe.Sizeof(_data))
+
+	err = setupDiGetDeviceInstallParams(deviceInfoSet, deviceInfoData, &_data)
+	if err != nil {
+		return
+	}
+
+	return _data.toGo(), nil
+}
+
+// GetDeviceInstallParams method retrieves device installation parameters for a device information set or a particular device information element.
+func (deviceInfoSet DevInfo) GetDeviceInstallParams(deviceInfoData *SP_DEVINFO_DATA) (*DevInstallParams, error) {
+	return SetupDiGetDeviceInstallParams(deviceInfoSet, deviceInfoData)
+}
+
+// SetupDiGetClassInstallParams function retrieves class installation parameters for a device information set or a particular device information element.
+//sys	SetupDiGetClassInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, classInstallParams *SP_CLASSINSTALL_HEADER, classInstallParamsSize uint32, requiredSize *uint32) (err error) = setupapi.SetupDiGetClassInstallParamsW
+
+// GetClassInstallParams method retrieves class installation parameters for a device information set or a particular device information element.
+func (deviceInfoSet DevInfo) GetClassInstallParams(deviceInfoData *SP_DEVINFO_DATA, classInstallParams *SP_CLASSINSTALL_HEADER, classInstallParamsSize uint32, requiredSize *uint32) error {
+	return SetupDiGetClassInstallParams(deviceInfoSet, deviceInfoData, classInstallParams, classInstallParamsSize, requiredSize)
+}
+
+//sys	setupDiSetDeviceInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, deviceInstallParams *_SP_DEVINSTALL_PARAMS) (err error) = setupapi.SetupDiSetDeviceInstallParamsW
+
+// SetupDiSetDeviceInstallParams function sets device installation parameters for a device information set or a particular device information element.
+func SetupDiSetDeviceInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, deviceInstallParams *DevInstallParams) (err error) {
+	_data, err := deviceInstallParams.toWindows()
+	if err != nil {
+		return
+	}
+
+	return setupDiSetDeviceInstallParams(deviceInfoSet, deviceInfoData, _data)
+}
+
+// SetDeviceInstallParams member sets device installation parameters for a device information set or a particular device information element.
+func (deviceInfoSet DevInfo) SetDeviceInstallParams(deviceInfoData *SP_DEVINFO_DATA, deviceInstallParams *DevInstallParams) error {
+	return SetupDiSetDeviceInstallParams(deviceInfoSet, deviceInfoData, deviceInstallParams)
+}
+
+// SetupDiSetClassInstallParams function sets or clears class install parameters for a device information set or a particular device information element.
+//sys	SetupDiSetClassInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, classInstallParams *SP_CLASSINSTALL_HEADER, classInstallParamsSize uint32) (err error) = setupapi.SetupDiSetClassInstallParamsW
+
+// SetClassInstallParams method sets or clears class install parameters for a device information set or a particular device information element.
+func (deviceInfoSet DevInfo) SetClassInstallParams(deviceInfoData *SP_DEVINFO_DATA, classInstallParams *SP_CLASSINSTALL_HEADER, classInstallParamsSize uint32) error {
+	return SetupDiSetClassInstallParams(deviceInfoSet, deviceInfoData, classInstallParams, classInstallParamsSize)
+}
+
+//sys	setupDiClassNameFromGuidEx(classGUID *windows.GUID, className *uint16, classNameSize uint32, requiredSize *uint32, machineName *uint16, reserved uintptr) (err error) = setupapi.SetupDiClassNameFromGuidExW
+
+// SetupDiClassNameFromGuidEx function retrieves the class name associated with a class GUID. The class can be installed on a local or remote computer.
+func SetupDiClassNameFromGuidEx(classGUID *windows.GUID, machineName string) (className string, err error) {
+	var classNameUTF16 [MAX_CLASS_NAME_LEN]uint16
+
+	var machineNameUTF16 *uint16
+	if machineName != "" {
+		machineNameUTF16, err = syscall.UTF16PtrFromString(machineName)
+		if err != nil {
+			return
+		}
+	}
+
+	err = setupDiClassNameFromGuidEx(classGUID, &classNameUTF16[0], MAX_CLASS_NAME_LEN, nil, machineNameUTF16, 0)
+	if err != nil {
+		return
+	}
+
+	className = windows.UTF16ToString(classNameUTF16[:])
+	return
+}
+
+//sys	setupDiClassGuidsFromNameEx(className *uint16, classGuidList *windows.GUID, classGuidListSize uint32, requiredSize *uint32, machineName *uint16, reserved uintptr) (err error) = setupapi.SetupDiClassGuidsFromNameExW
+
+// SetupDiClassGuidsFromNameEx function retrieves the GUIDs associated with the specified class name. This resulting list contains the classes currently installed on a local or remote computer.
+func SetupDiClassGuidsFromNameEx(className string, machineName string) (classGuidLists []windows.GUID, err error) {
+	classNameUTF16, err := syscall.UTF16PtrFromString(className)
+	if err != nil {
+		return
+	}
+
+	const bufCapacity = 4
+	var buf [bufCapacity]windows.GUID
+	var bufLen uint32
+
+	var machineNameUTF16 *uint16
+	if machineName != "" {
+		machineNameUTF16, err = syscall.UTF16PtrFromString(machineName)
+		if err != nil {
+			return
+		}
+	}
+
+	err = setupDiClassGuidsFromNameEx(classNameUTF16, &buf[0], bufCapacity, &bufLen, machineNameUTF16, 0)
+	if err == nil {
+		// The GUID array was sufficiently big. Return its slice.
+		return buf[:bufLen], nil
+	}
+
+	if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_INSUFFICIENT_BUFFER {
+		// The GUID array was too small. Now that we got the required size, create another one big enough and retry.
+		buf := make([]windows.GUID, bufLen)
+		err = setupDiClassGuidsFromNameEx(classNameUTF16, &buf[0], bufLen, &bufLen, machineNameUTF16, 0)
+		if err == nil {
+			return buf[:bufLen], nil
+		}
+	}
+
+	return
+}
+
+//sys	setupDiGetSelectedDevice(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA) (err error) = setupapi.SetupDiGetSelectedDevice
+
+// SetupDiGetSelectedDevice function retrieves the selected device information element in a device information set.
+func SetupDiGetSelectedDevice(deviceInfoSet DevInfo) (*SP_DEVINFO_DATA, error) {
+	data := SP_DEVINFO_DATA{}
+	data.Size = uint32(unsafe.Sizeof(data))
+
+	return &data, setupDiGetSelectedDevice(deviceInfoSet, &data)
+}
+
+// GetSelectedDevice method retrieves the selected device information element in a device information set.
+func (deviceInfoSet DevInfo) GetSelectedDevice() (*SP_DEVINFO_DATA, error) {
+	return SetupDiGetSelectedDevice(deviceInfoSet)
+}
+
+// SetupDiSetSelectedDevice function sets a device information element as the selected member of a device information set. This function is typically used by an installation wizard.
+//sys	SetupDiSetSelectedDevice(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA) (err error) = setupapi.SetupDiSetSelectedDevice
+
+// SetSelectedDevice method sets a device information element as the selected member of a device information set. This function is typically used by an installation wizard.
+func (deviceInfoSet DevInfo) SetSelectedDevice(deviceInfoData *SP_DEVINFO_DATA) error {
+	return SetupDiSetSelectedDevice(deviceInfoSet, deviceInfoData)
+}
diff --git a/tun/wintun/setupapi/setupapi_windows_test.go b/tun/wintun/setupapi/setupapi_windows_test.go
new file mode 100644
index 0000000..e6b00c9
--- /dev/null
+++ b/tun/wintun/setupapi/setupapi_windows_test.go
@@ -0,0 +1,452 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package setupapi
+
+import (
+	"strings"
+	"syscall"
+	"testing"
+
+	"golang.org/x/sys/windows"
+)
+
+var deviceClassNetGUID = windows.GUID{0x4d36e972, 0xe325, 0x11ce, [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
+var computerName string
+
+func init() {
+	computerName, _ = windows.ComputerName()
+}
+
+func TestSetupDiCreateDeviceInfoListEx(t *testing.T) {
+	devInfoList, err := SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, 0, "")
+	if err == nil {
+		devInfoList.Close()
+	} else {
+		t.Errorf("Error calling SetupDiCreateDeviceInfoListEx: %s", err.Error())
+	}
+
+	devInfoList, err = SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, 0, computerName)
+	if err == nil {
+		devInfoList.Close()
+	} else {
+		t.Errorf("Error calling SetupDiCreateDeviceInfoListEx: %s", err.Error())
+	}
+
+	devInfoList, err = SetupDiCreateDeviceInfoListEx(nil, 0, "")
+	if err == nil {
+		devInfoList.Close()
+	} else {
+		t.Errorf("Error calling SetupDiCreateDeviceInfoListEx(nil): %s", err.Error())
+	}
+}
+
+func TestSetupDiGetDeviceInfoListDetail(t *testing.T) {
+	devInfoList, err := SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, DIGCF_PRESENT, DevInfo(0), "")
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+	defer devInfoList.Close()
+
+	data, err := devInfoList.GetDeviceInfoListDetail()
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetDeviceInfoListDetail: %s", err.Error())
+	} else {
+		if data.ClassGUID != deviceClassNetGUID {
+			t.Error("SetupDiGetDeviceInfoListDetail returned different class GUID")
+		}
+
+		if data.RemoteMachineHandle != windows.Handle(0) {
+			t.Error("SetupDiGetDeviceInfoListDetail returned non-NULL remote machine handle")
+		}
+
+		if data.RemoteMachineName != "" {
+			t.Error("SetupDiGetDeviceInfoListDetail returned non-NULL remote machine name")
+		}
+	}
+
+	devInfoList, err = SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, DIGCF_PRESENT, DevInfo(0), computerName)
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+	defer devInfoList.Close()
+
+	data, err = devInfoList.GetDeviceInfoListDetail()
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetDeviceInfoListDetail: %s", err.Error())
+	} else {
+		if data.ClassGUID != deviceClassNetGUID {
+			t.Error("SetupDiGetDeviceInfoListDetail returned different class GUID")
+		}
+
+		if data.RemoteMachineHandle == windows.Handle(0) {
+			t.Error("SetupDiGetDeviceInfoListDetail returned NULL remote machine handle")
+		}
+
+		if data.RemoteMachineName != computerName {
+			t.Error("SetupDiGetDeviceInfoListDetail returned different remote machine name")
+		}
+	}
+}
+
+func TestSetupDiCreateDeviceInfo(t *testing.T) {
+	devInfoList, err := SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, 0, computerName)
+	if err != nil {
+		t.Errorf("Error calling SetupDiCreateDeviceInfoListEx: %s", err.Error())
+	}
+	defer devInfoList.Close()
+
+	deviceClassNetName, err := SetupDiClassNameFromGuidEx(&deviceClassNetGUID, computerName)
+	if err != nil {
+		t.Errorf("Error calling SetupDiClassNameFromGuidEx: %s", err.Error())
+	}
+
+	devInfoData, err := devInfoList.CreateDeviceInfo(deviceClassNetName, &deviceClassNetGUID, "This is a test device", 0, DICD_GENERATE_ID)
+	if err != nil {
+		// Access denied is expected, as the SetupDiCreateDeviceInfo() require elevation to succeed.
+		if errWin, ok := err.(syscall.Errno); !ok || errWin != windows.ERROR_ACCESS_DENIED {
+			t.Errorf("Error calling SetupDiCreateDeviceInfo: %s", err.Error())
+		}
+	} else if devInfoData.ClassGUID != deviceClassNetGUID {
+		t.Error("SetupDiCreateDeviceInfo returned different class GUID")
+	}
+}
+
+func TestSetupDiEnumDeviceInfo(t *testing.T) {
+	devInfoList, err := SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, DIGCF_PRESENT, DevInfo(0), "")
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+	defer devInfoList.Close()
+
+	for i := 0; true; i++ {
+		data, err := devInfoList.EnumDeviceInfo(i)
+		if err != nil {
+			if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
+				break
+			}
+			continue
+		}
+
+		if data.ClassGUID != deviceClassNetGUID {
+			t.Error("SetupDiEnumDeviceInfo returned different class GUID")
+		}
+	}
+}
+
+func TestDevInfo_BuildDriverInfoList(t *testing.T) {
+	devInfoList, err := SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, DIGCF_PRESENT, DevInfo(0), "")
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+	defer devInfoList.Close()
+
+	for i := 0; true; i++ {
+		deviceData, err := devInfoList.EnumDeviceInfo(i)
+		if err != nil {
+			if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
+				break
+			}
+			continue
+		}
+
+		const driverType SPDIT = SPDIT_COMPATDRIVER
+		err = devInfoList.BuildDriverInfoList(deviceData, driverType)
+		if err != nil {
+			t.Errorf("Error calling SetupDiBuildDriverInfoList: %s", err.Error())
+		}
+		defer devInfoList.DestroyDriverInfoList(deviceData, driverType)
+
+		var selectedDriverData *SP_DRVINFO_DATA
+		for j := 0; true; j++ {
+			driverData, err := devInfoList.EnumDriverInfo(deviceData, driverType, j)
+			if err != nil {
+				if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
+					break
+				}
+				continue
+			}
+
+			if driverData2, err2 := driverData.toGo().toWindows(); err2 != nil || *driverData2 != *driverData {
+				t.Error("Error converting between SP_DRVINFO_DATA and DrvInfoData")
+			}
+
+			if driverData.DriverType == 0 {
+				continue
+			}
+
+			if !driverData.IsNewer(windows.Filetime{}, 0) {
+				t.Error("Driver should have non-zero date and version")
+			}
+			if !driverData.IsNewer(windows.Filetime{HighDateTime: driverData.DriverDate.HighDateTime}, 0) {
+				t.Error("Driver should have non-zero date and version")
+			}
+			if driverData.IsNewer(windows.Filetime{HighDateTime: driverData.DriverDate.HighDateTime + 1}, 0) {
+				t.Error("Driver should report newer version on high-date-time")
+			}
+			if !driverData.IsNewer(windows.Filetime{HighDateTime: driverData.DriverDate.HighDateTime, LowDateTime: driverData.DriverDate.LowDateTime}, 0) {
+				t.Error("Driver should have non-zero version")
+			}
+			if driverData.IsNewer(windows.Filetime{HighDateTime: driverData.DriverDate.HighDateTime, LowDateTime: driverData.DriverDate.LowDateTime + 1}, 0) {
+				t.Error("Driver should report newer version on low-date-time")
+			}
+			if driverData.IsNewer(windows.Filetime{HighDateTime: driverData.DriverDate.HighDateTime, LowDateTime: driverData.DriverDate.LowDateTime}, driverData.DriverVersion) {
+				t.Error("Driver should not be newer than itself")
+			}
+			if driverData.IsNewer(windows.Filetime{HighDateTime: driverData.DriverDate.HighDateTime, LowDateTime: driverData.DriverDate.LowDateTime}, driverData.DriverVersion+1) {
+				t.Error("Driver should report newer version on version")
+			}
+
+			err = devInfoList.SetSelectedDriver(deviceData, driverData)
+			if err != nil {
+				t.Errorf("Error calling SetupDiSetSelectedDriver: %s", err.Error())
+			} else {
+				selectedDriverData = driverData
+			}
+
+			driverDetailData, err := devInfoList.GetDriverInfoDetail(deviceData, driverData)
+			if err != nil {
+				t.Errorf("Error calling SetupDiGetDriverInfoDetail: %s", err.Error())
+			}
+
+			if driverDetailData.IsCompatible("foobar-aab6e3a4-144e-4786-88d3-6cec361e1edd") {
+				t.Error("Invalid HWID compatibitlity reported")
+			}
+			if !driverDetailData.IsCompatible(strings.ToUpper(driverDetailData.HardwareID)) {
+				t.Error("HWID compatibitlity missed")
+			}
+			for k := range driverDetailData.CompatIDs {
+				if !driverDetailData.IsCompatible(strings.ToUpper(driverDetailData.CompatIDs[k])) {
+					t.Error("HWID compatibitlity missed")
+				}
+			}
+		}
+
+		selectedDriverData2, err := devInfoList.GetSelectedDriver(deviceData)
+		if err != nil {
+			t.Errorf("Error calling SetupDiGetSelectedDriver: %s", err.Error())
+		} else if *selectedDriverData != *selectedDriverData2 {
+			t.Error("SetupDiGetSelectedDriver should return driver selected with SetupDiSetSelectedDriver")
+		}
+	}
+}
+
+func TestSetupDiGetClassDevsEx(t *testing.T) {
+	devInfoList, err := SetupDiGetClassDevsEx(&deviceClassNetGUID, "PCI", 0, DIGCF_PRESENT, DevInfo(0), computerName)
+	if err == nil {
+		devInfoList.Close()
+	} else {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+
+	devInfoList, err = SetupDiGetClassDevsEx(nil, "", 0, DIGCF_PRESENT, DevInfo(0), "")
+	if err == nil {
+		devInfoList.Close()
+		t.Errorf("SetupDiGetClassDevsEx(nil, ...) should fail")
+	} else {
+		if errWin, ok := err.(syscall.Errno); !ok || errWin != 87 /*ERROR_INVALID_PARAMETER*/ {
+			t.Errorf("SetupDiGetClassDevsEx(nil, ...) should fail with ERROR_INVALID_PARAMETER")
+		}
+	}
+}
+
+func TestSetupDiOpenDevRegKey(t *testing.T) {
+	devInfoList, err := SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, DIGCF_PRESENT, DevInfo(0), "")
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+	defer devInfoList.Close()
+
+	for i := 0; true; i++ {
+		data, err := devInfoList.EnumDeviceInfo(i)
+		if err != nil {
+			if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
+				break
+			}
+			continue
+		}
+
+		key, err := devInfoList.OpenDevRegKey(data, DICS_FLAG_GLOBAL, 0, DIREG_DRV, windows.KEY_READ)
+		if err != nil {
+			t.Errorf("Error calling SetupDiOpenDevRegKey: %s", err.Error())
+		}
+		defer key.Close()
+	}
+}
+
+func TestSetupDiGetDeviceRegistryProperty(t *testing.T) {
+	devInfoList, err := SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, DIGCF_PRESENT, DevInfo(0), "")
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+	defer devInfoList.Close()
+
+	for i := 0; true; i++ {
+		data, err := devInfoList.EnumDeviceInfo(i)
+		if err != nil {
+			if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
+				break
+			}
+			continue
+		}
+
+		val, err := devInfoList.GetDeviceRegistryProperty(data, SPDRP_CLASS)
+		if err != nil {
+			t.Errorf("Error calling SetupDiGetDeviceRegistryProperty(SPDRP_CLASS): %s", err.Error())
+		} else if class, ok := val.(string); !ok || strings.ToLower(class) != "net" {
+			t.Errorf("SetupDiGetDeviceRegistryProperty(SPDRP_CLASS) should return \"Net\"")
+		}
+
+		val, err = devInfoList.GetDeviceRegistryProperty(data, SPDRP_CLASSGUID)
+		if err != nil {
+			t.Errorf("Error calling SetupDiGetDeviceRegistryProperty(SPDRP_CLASSGUID): %s", err.Error())
+		} /* TODO: Parse GUID string: else if classGUID, ok := val.(string); !ok || parseGUID(classGUID) != deviceClassNetGUID {
+			t.Errorf("SetupDiGetDeviceRegistryProperty(SPDRP_CLASSGUID) should return %x", deviceClassNetGUID)
+		}*/
+
+		val, err = devInfoList.GetDeviceRegistryProperty(data, SPDRP_COMPATIBLEIDS)
+		if err != nil {
+			// Some devices have no SPDRP_COMPATIBLEIDS.
+			if errWin, ok := err.(syscall.Errno); !ok || errWin != 13 /*windows.ERROR_INVALID_DATA*/ {
+				t.Errorf("Error calling SetupDiGetDeviceRegistryProperty(SPDRP_COMPATIBLEIDS): %s", err.Error())
+			}
+		}
+
+		val, err = devInfoList.GetDeviceRegistryProperty(data, SPDRP_CONFIGFLAGS)
+		if err != nil {
+			t.Errorf("Error calling SetupDiGetDeviceRegistryProperty(SPDRP_CONFIGFLAGS): %s", err.Error())
+		}
+
+		val, err = devInfoList.GetDeviceRegistryProperty(data, SPDRP_DEVICE_POWER_DATA)
+		if err != nil {
+			t.Errorf("Error calling SetupDiGetDeviceRegistryProperty(SPDRP_DEVICE_POWER_DATA): %s", err.Error())
+		}
+	}
+}
+
+func TestSetupDiGetDeviceInstallParams(t *testing.T) {
+	devInfoList, err := SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, DIGCF_PRESENT, DevInfo(0), "")
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+	defer devInfoList.Close()
+
+	for i := 0; true; i++ {
+		data, err := devInfoList.EnumDeviceInfo(i)
+		if err != nil {
+			if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
+				break
+			}
+			continue
+		}
+
+		_, err = devInfoList.GetDeviceInstallParams(data)
+		if err != nil {
+			t.Errorf("Error calling SetupDiGetDeviceInstallParams: %s", err.Error())
+		}
+	}
+}
+
+func TestSetupDiClassNameFromGuidEx(t *testing.T) {
+	deviceClassNetName, err := SetupDiClassNameFromGuidEx(&deviceClassNetGUID, "")
+	if err != nil {
+		t.Errorf("Error calling SetupDiClassNameFromGuidEx: %s", err.Error())
+	} else if strings.ToLower(deviceClassNetName) != "net" {
+		t.Errorf("SetupDiClassNameFromGuidEx(%x) should return \"Net\"", deviceClassNetGUID)
+	}
+
+	deviceClassNetName, err = SetupDiClassNameFromGuidEx(&deviceClassNetGUID, computerName)
+	if err != nil {
+		t.Errorf("Error calling SetupDiClassNameFromGuidEx: %s", err.Error())
+	} else if strings.ToLower(deviceClassNetName) != "net" {
+		t.Errorf("SetupDiClassNameFromGuidEx(%x) should return \"Net\"", deviceClassNetGUID)
+	}
+
+	_, err = SetupDiClassNameFromGuidEx(nil, "")
+	if err == nil {
+		t.Errorf("SetupDiClassNameFromGuidEx(nil) should fail")
+	} else {
+		if errWin, ok := err.(syscall.Errno); !ok || errWin != 1784 /*ERROR_INVALID_USER_BUFFER*/ {
+			t.Errorf("SetupDiClassNameFromGuidEx(nil) should fail with ERROR_INVALID_USER_BUFFER")
+		}
+	}
+}
+
+func TestSetupDiClassGuidsFromNameEx(t *testing.T) {
+	ClassGUIDs, err := SetupDiClassGuidsFromNameEx("Net", "")
+	if err != nil {
+		t.Errorf("Error calling SetupDiClassGuidsFromNameEx: %s", err.Error())
+	} else {
+		found := false
+		for i := range ClassGUIDs {
+			if ClassGUIDs[i] == deviceClassNetGUID {
+				found = true
+				break
+			}
+		}
+		if !found {
+			t.Errorf("SetupDiClassGuidsFromNameEx(\"Net\") should return %x", deviceClassNetGUID)
+		}
+	}
+
+	ClassGUIDs, err = SetupDiClassGuidsFromNameEx("foobar-34274a51-a6e6-45f0-80d6-c62be96dd5fe", computerName)
+	if err != nil {
+		t.Errorf("Error calling SetupDiClassGuidsFromNameEx: %s", err.Error())
+	} else if len(ClassGUIDs) != 0 {
+		t.Errorf("SetupDiClassGuidsFromNameEx(\"foobar-34274a51-a6e6-45f0-80d6-c62be96dd5fe\") should return an empty GUID set")
+	}
+}
+
+func TestSetupDiGetSelectedDevice(t *testing.T) {
+	devInfoList, err := SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, DIGCF_PRESENT, DevInfo(0), "")
+	if err != nil {
+		t.Errorf("Error calling SetupDiGetClassDevsEx: %s", err.Error())
+	}
+	defer devInfoList.Close()
+
+	for i := 0; true; i++ {
+		data, err := devInfoList.EnumDeviceInfo(i)
+		if err != nil {
+			if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
+				break
+			}
+			continue
+		}
+
+		err = devInfoList.SetSelectedDevice(data)
+		if err != nil {
+			t.Errorf("Error calling SetupDiSetSelectedDevice: %s", err.Error())
+		}
+
+		data2, err := devInfoList.GetSelectedDevice()
+		if err != nil {
+			t.Errorf("Error calling SetupDiGetSelectedDevice: %s", err.Error())
+		} else if *data != *data2 {
+			t.Error("SetupDiGetSelectedDevice returned different data than was set by SetupDiSetSelectedDevice")
+		}
+	}
+
+	err = devInfoList.SetSelectedDevice(nil)
+	if err == nil {
+		t.Errorf("SetupDiSetSelectedDevice(nil) should fail")
+	} else {
+		if errWin, ok := err.(syscall.Errno); !ok || errWin != 87 /*ERROR_INVALID_PARAMETER*/ {
+			t.Errorf("SetupDiSetSelectedDevice(nil) should fail with ERROR_INVALID_USER_BUFFER")
+		}
+	}
+}
+
+func TestUTF16ToBuf(t *testing.T) {
+	buf := []uint16{0x0123, 0x4567, 0x89ab, 0xcdef}
+	buf2 := UTF16ToBuf(buf)
+	if len(buf)*2 != len(buf2) ||
+		cap(buf)*2 != cap(buf2) ||
+		buf2[0] != 0x23 || buf2[1] != 0x01 ||
+		buf2[2] != 0x67 || buf2[3] != 0x45 ||
+		buf2[4] != 0xab || buf2[5] != 0x89 ||
+		buf2[6] != 0xef || buf2[7] != 0xcd {
+		t.Errorf("SetupDiSetSelectedDevice(nil) should fail with ERROR_INVALID_USER_BUFFER")
+	}
+}
diff --git a/tun/wintun/setupapi/types_windows.go b/tun/wintun/setupapi/types_windows.go
new file mode 100644
index 0000000..c4aeff9
--- /dev/null
+++ b/tun/wintun/setupapi/types_windows.go
@@ -0,0 +1,571 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package setupapi
+
+import (
+	"strings"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+const (
+	MAX_DEVICE_ID_LEN   = 200
+	MAX_DEVNODE_ID_LEN  = MAX_DEVICE_ID_LEN
+	MAX_GUID_STRING_LEN = 39 // 38 chars + terminator null
+	MAX_CLASS_NAME_LEN  = 32
+	MAX_PROFILE_LEN     = 80
+	MAX_CONFIG_VALUE    = 9999
+	MAX_INSTANCE_VALUE  = 9999
+	CONFIGMG_VERSION    = 0x0400
+)
+
+//
+// Define maximum string length constants
+//
+const (
+	LINE_LEN                    = 256  // Windows 9x-compatible maximum for displayable strings coming from a device INF.
+	MAX_INF_STRING_LENGTH       = 4096 // Actual maximum size of an INF string (including string substitutions).
+	MAX_INF_SECTION_NAME_LENGTH = 255  // For Windows 9x compatibility, INF section names should be constrained to 32 characters.
+	MAX_TITLE_LEN               = 60
+	MAX_INSTRUCTION_LEN         = 256
+	MAX_LABEL_LEN               = 30
+	MAX_SERVICE_NAME_LEN        = 256
+	MAX_SUBTITLE_LEN            = 256
+)
+
+const (
+	// SP_MAX_MACHINENAME_LENGTH defines maximum length of a machine name in the format expected by ConfigMgr32 CM_Connect_Machine (i.e., "\\\\MachineName\0").
+	SP_MAX_MACHINENAME_LENGTH = windows.MAX_PATH + 3
+)
+
+// HSPFILEQ is type for setup file queue
+type HSPFILEQ uintptr
+
+// DevInfo holds reference to device information set
+type DevInfo windows.Handle
+
+// SP_DEVINFO_DATA is a device information structure (references a device instance that is a member of a device information set)
+type SP_DEVINFO_DATA struct {
+	Size      uint32
+	ClassGUID windows.GUID
+	DevInst   uint32 // DEVINST handle
+	_         uintptr
+}
+
+type _SP_DEVINFO_LIST_DETAIL_DATA struct {
+	Size                uint32
+	ClassGUID           windows.GUID
+	RemoteMachineHandle windows.Handle
+	RemoteMachineName   [SP_MAX_MACHINENAME_LENGTH]uint16
+}
+
+func (_data *_SP_DEVINFO_LIST_DETAIL_DATA) toGo() *DevInfoListDetailData {
+	return &DevInfoListDetailData{
+		ClassGUID:           _data.ClassGUID,
+		RemoteMachineHandle: _data.RemoteMachineHandle,
+		RemoteMachineName:   windows.UTF16ToString(_data.RemoteMachineName[:]),
+	}
+}
+
+// DevInfoListDetailData is a structure for detailed information on a device information set (used for SetupDiGetDeviceInfoListDetail which supercedes the functionality of SetupDiGetDeviceInfoListClass).
+type DevInfoListDetailData struct {
+	ClassGUID           windows.GUID
+	RemoteMachineHandle windows.Handle
+	RemoteMachineName   string
+}
+
+// DI_FUNCTION is function type for device installer
+type DI_FUNCTION uint32
+
+const (
+	DIF_SELECTDEVICE                   DI_FUNCTION = 0x00000001
+	DIF_INSTALLDEVICE                  DI_FUNCTION = 0x00000002
+	DIF_ASSIGNRESOURCES                DI_FUNCTION = 0x00000003
+	DIF_PROPERTIES                     DI_FUNCTION = 0x00000004
+	DIF_REMOVE                         DI_FUNCTION = 0x00000005
+	DIF_FIRSTTIMESETUP                 DI_FUNCTION = 0x00000006
+	DIF_FOUNDDEVICE                    DI_FUNCTION = 0x00000007
+	DIF_SELECTCLASSDRIVERS             DI_FUNCTION = 0x00000008
+	DIF_VALIDATECLASSDRIVERS           DI_FUNCTION = 0x00000009
+	DIF_INSTALLCLASSDRIVERS            DI_FUNCTION = 0x0000000A
+	DIF_CALCDISKSPACE                  DI_FUNCTION = 0x0000000B
+	DIF_DESTROYPRIVATEDATA             DI_FUNCTION = 0x0000000C
+	DIF_VALIDATEDRIVER                 DI_FUNCTION = 0x0000000D
+	DIF_DETECT                         DI_FUNCTION = 0x0000000F
+	DIF_INSTALLWIZARD                  DI_FUNCTION = 0x00000010
+	DIF_DESTROYWIZARDDATA              DI_FUNCTION = 0x00000011
+	DIF_PROPERTYCHANGE                 DI_FUNCTION = 0x00000012
+	DIF_ENABLECLASS                    DI_FUNCTION = 0x00000013
+	DIF_DETECTVERIFY                   DI_FUNCTION = 0x00000014
+	DIF_INSTALLDEVICEFILES             DI_FUNCTION = 0x00000015
+	DIF_UNREMOVE                       DI_FUNCTION = 0x00000016
+	DIF_SELECTBESTCOMPATDRV            DI_FUNCTION = 0x00000017
+	DIF_ALLOW_INSTALL                  DI_FUNCTION = 0x00000018
+	DIF_REGISTERDEVICE                 DI_FUNCTION = 0x00000019
+	DIF_NEWDEVICEWIZARD_PRESELECT      DI_FUNCTION = 0x0000001A
+	DIF_NEWDEVICEWIZARD_SELECT         DI_FUNCTION = 0x0000001B
+	DIF_NEWDEVICEWIZARD_PREANALYZE     DI_FUNCTION = 0x0000001C
+	DIF_NEWDEVICEWIZARD_POSTANALYZE    DI_FUNCTION = 0x0000001D
+	DIF_NEWDEVICEWIZARD_FINISHINSTALL  DI_FUNCTION = 0x0000001E
+	DIF_INSTALLINTERFACES              DI_FUNCTION = 0x00000020
+	DIF_DETECTCANCEL                   DI_FUNCTION = 0x00000021
+	DIF_REGISTER_COINSTALLERS          DI_FUNCTION = 0x00000022
+	DIF_ADDPROPERTYPAGE_ADVANCED       DI_FUNCTION = 0x00000023
+	DIF_ADDPROPERTYPAGE_BASIC          DI_FUNCTION = 0x00000024
+	DIF_TROUBLESHOOTER                 DI_FUNCTION = 0x00000026
+	DIF_POWERMESSAGEWAKE               DI_FUNCTION = 0x00000027
+	DIF_ADDREMOTEPROPERTYPAGE_ADVANCED DI_FUNCTION = 0x00000028
+	DIF_UPDATEDRIVER_UI                DI_FUNCTION = 0x00000029
+	DIF_FINISHINSTALL_ACTION           DI_FUNCTION = 0x0000002A
+)
+
+type _SP_DEVINSTALL_PARAMS struct {
+	Size                     uint32
+	Flags                    DI_FLAGS
+	FlagsEx                  DI_FLAGSEX
+	hwndParent               uintptr
+	InstallMsgHandler        uintptr
+	InstallMsgHandlerContext uintptr
+	FileQueue                HSPFILEQ
+	_                        uintptr
+	_                        uint32
+	DriverPath               [windows.MAX_PATH]uint16
+}
+
+func (_data *_SP_DEVINSTALL_PARAMS) toGo() *DevInstallParams {
+	return &DevInstallParams{
+		Flags:                    _data.Flags,
+		FlagsEx:                  _data.FlagsEx,
+		hwndParent:               _data.hwndParent,
+		InstallMsgHandler:        _data.InstallMsgHandler,
+		InstallMsgHandlerContext: _data.InstallMsgHandlerContext,
+		FileQueue:                _data.FileQueue,
+		DriverPath:               windows.UTF16ToString(_data.DriverPath[:]),
+	}
+}
+
+// DevInstallParams is device installation parameters structure (associated with a particular device information element, or globally with a device information set)
+type DevInstallParams struct {
+	Flags                    DI_FLAGS
+	FlagsEx                  DI_FLAGSEX
+	hwndParent               uintptr
+	InstallMsgHandler        uintptr
+	InstallMsgHandlerContext uintptr
+	FileQueue                HSPFILEQ
+	DriverPath               string
+}
+
+func (DeviceInstallParams *DevInstallParams) toWindows() (_data *_SP_DEVINSTALL_PARAMS, err error) {
+	_data = &_SP_DEVINSTALL_PARAMS{
+		Flags:                    DeviceInstallParams.Flags,
+		FlagsEx:                  DeviceInstallParams.FlagsEx,
+		hwndParent:               DeviceInstallParams.hwndParent,
+		InstallMsgHandler:        DeviceInstallParams.InstallMsgHandler,
+		InstallMsgHandlerContext: DeviceInstallParams.InstallMsgHandlerContext,
+		FileQueue:                DeviceInstallParams.FileQueue,
+	}
+	_data.Size = uint32(unsafe.Sizeof(*_data))
+
+	driverPathUTF16, err := syscall.UTF16FromString(DeviceInstallParams.DriverPath)
+	if err != nil {
+		return
+	}
+	copy(_data.DriverPath[:], driverPathUTF16)
+
+	return
+}
+
+// DI_FLAGS is SP_DEVINSTALL_PARAMS.Flags values
+type DI_FLAGS uint32
+
+const (
+	// Flags for choosing a device
+	DI_SHOWOEM       DI_FLAGS = 0x00000001 // support Other... button
+	DI_SHOWCOMPAT    DI_FLAGS = 0x00000002 // show compatibility list
+	DI_SHOWCLASS     DI_FLAGS = 0x00000004 // show class list
+	DI_SHOWALL       DI_FLAGS = 0x00000007 // both class & compat list shown
+	DI_NOVCP         DI_FLAGS = 0x00000008 // don't create a new copy queue--use caller-supplied FileQueue
+	DI_DIDCOMPAT     DI_FLAGS = 0x00000010 // Searched for compatible devices
+	DI_DIDCLASS      DI_FLAGS = 0x00000020 // Searched for class devices
+	DI_AUTOASSIGNRES DI_FLAGS = 0x00000040 // No UI for resources if possible
+
+	// Flags returned by DiInstallDevice to indicate need to reboot/restart
+	DI_NEEDRESTART DI_FLAGS = 0x00000080 // Reboot required to take effect
+	DI_NEEDREBOOT  DI_FLAGS = 0x00000100 // ""
+
+	// Flags for device installation
+	DI_NOBROWSE DI_FLAGS = 0x00000200 // no Browse... in InsertDisk
+
+	// Flags set by DiBuildDriverInfoList
+	DI_MULTMFGS DI_FLAGS = 0x00000400 // Set if multiple manufacturers in class driver list
+
+	// Flag indicates that device is disabled
+	DI_DISABLED DI_FLAGS = 0x00000800 // Set if device disabled
+
+	// Flags for Device/Class Properties
+	DI_GENERALPAGE_ADDED  DI_FLAGS = 0x00001000
+	DI_RESOURCEPAGE_ADDED DI_FLAGS = 0x00002000
+
+	// Flag to indicate the setting properties for this Device (or class) caused a change so the Dev Mgr UI probably needs to be updated.
+	DI_PROPERTIES_CHANGE DI_FLAGS = 0x00004000
+
+	// Flag to indicate that the sorting from the INF file should be used.
+	DI_INF_IS_SORTED DI_FLAGS = 0x00008000
+
+	// Flag to indicate that only the the INF specified by SP_DEVINSTALL_PARAMS.DriverPath should be searched.
+	DI_ENUMSINGLEINF DI_FLAGS = 0x00010000
+
+	// Flag that prevents ConfigMgr from removing/re-enumerating devices during device
+	// registration, installation, and deletion.
+	DI_DONOTCALLCONFIGMG DI_FLAGS = 0x00020000
+
+	// The following flag can be used to install a device disabled
+	DI_INSTALLDISABLED DI_FLAGS = 0x00040000
+
+	// Flag that causes SetupDiBuildDriverInfoList to build a device's compatible driver
+	// list from its existing class driver list, instead of the normal INF search.
+	DI_COMPAT_FROM_CLASS DI_FLAGS = 0x00080000
+
+	// This flag is set if the Class Install params should be used.
+	DI_CLASSINSTALLPARAMS DI_FLAGS = 0x00100000
+
+	// This flag is set if the caller of DiCallClassInstaller does NOT want the internal default action performed if the Class installer returns ERROR_DI_DO_DEFAULT.
+	DI_NODI_DEFAULTACTION DI_FLAGS = 0x00200000
+
+	// Flags for device installation
+	DI_QUIETINSTALL        DI_FLAGS = 0x00800000 // don't confuse the user with questions or excess info
+	DI_NOFILECOPY          DI_FLAGS = 0x01000000 // No file Copy necessary
+	DI_FORCECOPY           DI_FLAGS = 0x02000000 // Force files to be copied from install path
+	DI_DRIVERPAGE_ADDED    DI_FLAGS = 0x04000000 // Prop provider added Driver page.
+	DI_USECI_SELECTSTRINGS DI_FLAGS = 0x08000000 // Use Class Installer Provided strings in the Select Device Dlg
+	DI_OVERRIDE_INFFLAGS   DI_FLAGS = 0x10000000 // Override INF flags
+	DI_PROPS_NOCHANGEUSAGE DI_FLAGS = 0x20000000 // No Enable/Disable in General Props
+
+	DI_NOSELECTICONS DI_FLAGS = 0x40000000 // No small icons in select device dialogs
+
+	DI_NOWRITE_IDS DI_FLAGS = 0x80000000 // Don't write HW & Compat IDs on install
+)
+
+// DI_FLAGSEX is SP_DEVINSTALL_PARAMS.FlagsEx values
+type DI_FLAGSEX uint32
+
+const (
+	DI_FLAGSEX_CI_FAILED                DI_FLAGSEX = 0x00000004 // Failed to Load/Call class installer
+	DI_FLAGSEX_FINISHINSTALL_ACTION     DI_FLAGSEX = 0x00000008 // Class/co-installer wants to get a DIF_FINISH_INSTALL action in client context.
+	DI_FLAGSEX_DIDINFOLIST              DI_FLAGSEX = 0x00000010 // Did the Class Info List
+	DI_FLAGSEX_DIDCOMPATINFO            DI_FLAGSEX = 0x00000020 // Did the Compat Info List
+	DI_FLAGSEX_FILTERCLASSES            DI_FLAGSEX = 0x00000040
+	DI_FLAGSEX_SETFAILEDINSTALL         DI_FLAGSEX = 0x00000080
+	DI_FLAGSEX_DEVICECHANGE             DI_FLAGSEX = 0x00000100
+	DI_FLAGSEX_ALWAYSWRITEIDS           DI_FLAGSEX = 0x00000200
+	DI_FLAGSEX_PROPCHANGE_PENDING       DI_FLAGSEX = 0x00000400 // One or more device property sheets have had changes made to them, and need to have a DIF_PROPERTYCHANGE occur.
+	DI_FLAGSEX_ALLOWEXCLUDEDDRVS        DI_FLAGSEX = 0x00000800
+	DI_FLAGSEX_NOUIONQUERYREMOVE        DI_FLAGSEX = 0x00001000
+	DI_FLAGSEX_USECLASSFORCOMPAT        DI_FLAGSEX = 0x00002000 // Use the device's class when building compat drv list. (Ignored if DI_COMPAT_FROM_CLASS flag is specified.)
+	DI_FLAGSEX_NO_DRVREG_MODIFY         DI_FLAGSEX = 0x00008000 // Don't run AddReg and DelReg for device's software (driver) key.
+	DI_FLAGSEX_IN_SYSTEM_SETUP          DI_FLAGSEX = 0x00010000 // Installation is occurring during initial system setup.
+	DI_FLAGSEX_INET_DRIVER              DI_FLAGSEX = 0x00020000 // Driver came from Windows Update
+	DI_FLAGSEX_APPENDDRIVERLIST         DI_FLAGSEX = 0x00040000 // Cause SetupDiBuildDriverInfoList to append a new driver list to an existing list.
+	DI_FLAGSEX_PREINSTALLBACKUP         DI_FLAGSEX = 0x00080000 // not used
+	DI_FLAGSEX_BACKUPONREPLACE          DI_FLAGSEX = 0x00100000 // not used
+	DI_FLAGSEX_DRIVERLIST_FROM_URL      DI_FLAGSEX = 0x00200000 // build driver list from INF(s) retrieved from URL specified in SP_DEVINSTALL_PARAMS.DriverPath (empty string means Windows Update website)
+	DI_FLAGSEX_EXCLUDE_OLD_INET_DRIVERS DI_FLAGSEX = 0x00800000 // Don't include old Internet drivers when building a driver list. Ignored on Windows Vista and later.
+	DI_FLAGSEX_POWERPAGE_ADDED          DI_FLAGSEX = 0x01000000 // class installer added their own power page
+	DI_FLAGSEX_FILTERSIMILARDRIVERS     DI_FLAGSEX = 0x02000000 // only include similar drivers in class list
+	DI_FLAGSEX_INSTALLEDDRIVER          DI_FLAGSEX = 0x04000000 // only add the installed driver to the class or compat driver list.  Used in calls to SetupDiBuildDriverInfoList
+	DI_FLAGSEX_NO_CLASSLIST_NODE_MERGE  DI_FLAGSEX = 0x08000000 // Don't remove identical driver nodes from the class list
+	DI_FLAGSEX_ALTPLATFORM_DRVSEARCH    DI_FLAGSEX = 0x10000000 // Build driver list based on alternate platform information specified in associated file queue
+	DI_FLAGSEX_RESTART_DEVICE_ONLY      DI_FLAGSEX = 0x20000000 // only restart the device drivers are being installed on as opposed to restarting all devices using those drivers.
+	DI_FLAGSEX_RECURSIVESEARCH          DI_FLAGSEX = 0x40000000 // Tell SetupDiBuildDriverInfoList to do a recursive search
+	DI_FLAGSEX_SEARCH_PUBLISHED_INFS    DI_FLAGSEX = 0x80000000 // Tell SetupDiBuildDriverInfoList to do a "published INF" search
+)
+
+// SP_CLASSINSTALL_HEADER is the first member of any class install parameters structure. It contains the device installation request code that defines the format of the rest of the install parameters structure.
+type SP_CLASSINSTALL_HEADER struct {
+	Size            uint32
+	InstallFunction DI_FUNCTION
+}
+
+// DICS_FLAG specifies the scope of a device property change
+type DICS_FLAG uint32
+
+const (
+	DICS_FLAG_GLOBAL         DICS_FLAG = 0x00000001 // make change in all hardware profiles
+	DICS_FLAG_CONFIGSPECIFIC DICS_FLAG = 0x00000002 // make change in specified profile only
+	DICS_FLAG_CONFIGGENERAL  DICS_FLAG = 0x00000004 // 1 or more hardware profile-specific changes to follow
+)
+
+// DI_REMOVEDEVICE specifies the scope of the device removal
+type DI_REMOVEDEVICE uint32
+
+const (
+	DI_REMOVEDEVICE_GLOBAL         DI_REMOVEDEVICE = 0x00000001 // Make this change in all hardware profiles. Remove information about the device from the registry.
+	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.
+)
+
+// SP_REMOVEDEVICE_PARAMS is a structure corresponding to a DIF_REMOVE install function.
+type SP_REMOVEDEVICE_PARAMS struct {
+	ClassInstallHeader SP_CLASSINSTALL_HEADER
+	Scope              DI_REMOVEDEVICE
+	HwProfile          uint32
+}
+
+type SP_DRVINFO_DATA struct {
+	Size          uint32
+	DriverType    uint32
+	_             uintptr
+	Description   [LINE_LEN]uint16
+	MfgName       [LINE_LEN]uint16
+	ProviderName  [LINE_LEN]uint16
+	DriverDate    windows.Filetime
+	DriverVersion uint64
+}
+
+func (data *SP_DRVINFO_DATA) toGo() *DrvInfoData {
+	return &DrvInfoData{
+		DriverType:    data.DriverType,
+		Description:   windows.UTF16ToString(data.Description[:]),
+		MfgName:       windows.UTF16ToString(data.MfgName[:]),
+		ProviderName:  windows.UTF16ToString(data.ProviderName[:]),
+		DriverDate:    data.DriverDate,
+		DriverVersion: data.DriverVersion,
+	}
+}
+
+// IsNewer method returns true if SP_DRVINFO_DATA date and version is newer than supplied parameters.
+func (data *SP_DRVINFO_DATA) IsNewer(driverDate windows.Filetime, driverVersion uint64) bool {
+	if data.DriverDate.HighDateTime > driverDate.HighDateTime {
+		return true
+	}
+	if data.DriverDate.HighDateTime < driverDate.HighDateTime {
+		return false
+	}
+
+	if data.DriverDate.LowDateTime > driverDate.LowDateTime {
+		return true
+	}
+	if data.DriverDate.LowDateTime < driverDate.LowDateTime {
+		return false
+	}
+
+	if data.DriverVersion > driverVersion {
+		return true
+	}
+	if data.DriverVersion < driverVersion {
+		return false
+	}
+
+	return false
+}
+
+// DrvInfoData is driver information structure (member of a driver info list that may be associated with a particular device instance, or (globally) with a device information set)
+type DrvInfoData struct {
+	DriverType    uint32
+	Description   string
+	MfgName       string
+	ProviderName  string
+	DriverDate    windows.Filetime
+	DriverVersion uint64
+}
+
+func (driverInfoData *DrvInfoData) toWindows() (data *SP_DRVINFO_DATA, err error) {
+	data = &SP_DRVINFO_DATA{
+		DriverType:    driverInfoData.DriverType,
+		DriverDate:    driverInfoData.DriverDate,
+		DriverVersion: driverInfoData.DriverVersion,
+	}
+	data.Size = uint32(unsafe.Sizeof(*data))
+
+	DescriptionUTF16, err := syscall.UTF16FromString(driverInfoData.Description)
+	if err != nil {
+		return
+	}
+	copy(data.Description[:], DescriptionUTF16)
+
+	MfgNameUTF16, err := syscall.UTF16FromString(driverInfoData.MfgName)
+	if err != nil {
+		return
+	}
+	copy(data.MfgName[:], MfgNameUTF16)
+
+	ProviderNameUTF16, err := syscall.UTF16FromString(driverInfoData.ProviderName)
+	if err != nil {
+		return
+	}
+	copy(data.ProviderName[:], ProviderNameUTF16)
+
+	return
+}
+
+type _SP_DRVINFO_DETAIL_DATA struct {
+	Size            uint32
+	InfDate         windows.Filetime
+	CompatIDsOffset uint32
+	CompatIDsLength uint32
+	_               uintptr
+	SectionName     [LINE_LEN]uint16
+	InfFileName     [windows.MAX_PATH]uint16
+	DrvDescription  [LINE_LEN]uint16
+	HardwareID      [1]uint16
+}
+
+func (_data *_SP_DRVINFO_DETAIL_DATA) toGo(bufLen uint32) (DriverInfoDetailData *DrvInfoDetailData) {
+	DriverInfoDetailData = &DrvInfoDetailData{
+		InfDate:        _data.InfDate,
+		SectionName:    windows.UTF16ToString(_data.SectionName[:]),
+		InfFileName:    windows.UTF16ToString(_data.InfFileName[:]),
+		DrvDescription: windows.UTF16ToString(_data.DrvDescription[:]),
+		CompatIDs:      []string{},
+	}
+
+	bufW := _data.getBuf(bufLen)
+
+	if _data.CompatIDsOffset > 1 {
+		DriverInfoDetailData.HardwareID = windows.UTF16ToString(bufW[:wcslen(bufW)])
+	}
+
+	if _data.CompatIDsLength > 0 {
+		bufW = bufW[_data.CompatIDsOffset : _data.CompatIDsOffset+_data.CompatIDsLength]
+		for i := 0; i < len(bufW); {
+			j := i + wcslen(bufW[i:])
+			if i < j {
+				DriverInfoDetailData.CompatIDs = append(DriverInfoDetailData.CompatIDs, windows.UTF16ToString(bufW[i:j]))
+			}
+			i = j + 1
+		}
+	}
+
+	return
+}
+
+func (_data *_SP_DRVINFO_DETAIL_DATA) getBuf(bufLen uint32) []uint16 {
+	len := (bufLen - uint32(unsafe.Offsetof(_data.HardwareID))) / 2
+	sl := struct {
+		addr *uint16
+		len  int
+		cap  int
+	}{&_data.HardwareID[0], int(len), int(len)}
+	return *(*[]uint16)(unsafe.Pointer(&sl))
+}
+
+// DrvInfoDetailData is driver information details structure (provides detailed information about a particular driver information structure)
+type DrvInfoDetailData struct {
+	InfDate        windows.Filetime
+	SectionName    string
+	InfFileName    string
+	DrvDescription string
+	HardwareID     string
+	CompatIDs      []string
+}
+
+// IsCompatible method tests if given hardware ID matches the driver or is listed on the compatible ID list.
+func (driverInfoDetailData *DrvInfoDetailData) IsCompatible(hwid string) bool {
+	hwidLC := strings.ToLower(hwid)
+	if strings.ToLower(driverInfoDetailData.HardwareID) == hwidLC {
+		return true
+	}
+	for i := range driverInfoDetailData.CompatIDs {
+		if strings.ToLower(driverInfoDetailData.CompatIDs[i]) == hwidLC {
+			return true
+		}
+	}
+
+	return false
+}
+
+// DICD flags control SetupDiCreateDeviceInfo
+type DICD uint32
+
+const (
+	DICD_GENERATE_ID       DICD = 0x00000001
+	DICD_INHERIT_CLASSDRVS DICD = 0x00000002
+)
+
+//
+// SPDIT flags to distinguish between class drivers and
+// device drivers.
+// (Passed in 'DriverType' parameter of driver information list APIs)
+//
+type SPDIT uint32
+
+const (
+	SPDIT_NODRIVER     SPDIT = 0x00000000
+	SPDIT_CLASSDRIVER  SPDIT = 0x00000001
+	SPDIT_COMPATDRIVER SPDIT = 0x00000002
+)
+
+// DIGCF flags control what is included in the device information set built by SetupDiGetClassDevs
+type DIGCF uint32
+
+const (
+	DIGCF_DEFAULT         DIGCF = 0x00000001 // only valid with DIGCF_DEVICEINTERFACE
+	DIGCF_PRESENT         DIGCF = 0x00000002
+	DIGCF_ALLCLASSES      DIGCF = 0x00000004
+	DIGCF_PROFILE         DIGCF = 0x00000008
+	DIGCF_DEVICEINTERFACE DIGCF = 0x00000010
+)
+
+// DIREG specifies values for SetupDiCreateDevRegKey, SetupDiOpenDevRegKey, and SetupDiDeleteDevRegKey.
+type DIREG uint32
+
+const (
+	DIREG_DEV  DIREG = 0x00000001 // Open/Create/Delete device key
+	DIREG_DRV  DIREG = 0x00000002 // Open/Create/Delete driver key
+	DIREG_BOTH DIREG = 0x00000004 // Delete both driver and Device key
+)
+
+//
+// SPDRP specifies device registry property codes
+// (Codes marked as read-only (R) may only be used for
+// SetupDiGetDeviceRegistryProperty)
+//
+// These values should cover the same set of registry properties
+// as defined by the CM_DRP codes in cfgmgr32.h.
+//
+// Note that SPDRP codes are zero based while CM_DRP codes are one based!
+//
+type SPDRP uint32
+
+const (
+	SPDRP_DEVICEDESC                  SPDRP = 0x00000000 // DeviceDesc (R/W)
+	SPDRP_HARDWAREID                  SPDRP = 0x00000001 // HardwareID (R/W)
+	SPDRP_COMPATIBLEIDS               SPDRP = 0x00000002 // CompatibleIDs (R/W)
+	SPDRP_SERVICE                     SPDRP = 0x00000004 // Service (R/W)
+	SPDRP_CLASS                       SPDRP = 0x00000007 // Class (R--tied to ClassGUID)
+	SPDRP_CLASSGUID                   SPDRP = 0x00000008 // ClassGUID (R/W)
+	SPDRP_DRIVER                      SPDRP = 0x00000009 // Driver (R/W)
+	SPDRP_CONFIGFLAGS                 SPDRP = 0x0000000A // ConfigFlags (R/W)
+	SPDRP_MFG                         SPDRP = 0x0000000B // Mfg (R/W)
+	SPDRP_FRIENDLYNAME                SPDRP = 0x0000000C // FriendlyName (R/W)
+	SPDRP_LOCATION_INFORMATION        SPDRP = 0x0000000D // LocationInformation (R/W)
+	SPDRP_PHYSICAL_DEVICE_OBJECT_NAME SPDRP = 0x0000000E // PhysicalDeviceObjectName (R)
+	SPDRP_CAPABILITIES                SPDRP = 0x0000000F // Capabilities (R)
+	SPDRP_UI_NUMBER                   SPDRP = 0x00000010 // UiNumber (R)
+	SPDRP_UPPERFILTERS                SPDRP = 0x00000011 // UpperFilters (R/W)
+	SPDRP_LOWERFILTERS                SPDRP = 0x00000012 // LowerFilters (R/W)
+	SPDRP_BUSTYPEGUID                 SPDRP = 0x00000013 // BusTypeGUID (R)
+	SPDRP_LEGACYBUSTYPE               SPDRP = 0x00000014 // LegacyBusType (R)
+	SPDRP_BUSNUMBER                   SPDRP = 0x00000015 // BusNumber (R)
+	SPDRP_ENUMERATOR_NAME             SPDRP = 0x00000016 // Enumerator Name (R)
+	SPDRP_SECURITY                    SPDRP = 0x00000017 // Security (R/W, binary form)
+	SPDRP_SECURITY_SDS                SPDRP = 0x00000018 // Security (W, SDS form)
+	SPDRP_DEVTYPE                     SPDRP = 0x00000019 // Device Type (R/W)
+	SPDRP_EXCLUSIVE                   SPDRP = 0x0000001A // Device is exclusive-access (R/W)
+	SPDRP_CHARACTERISTICS             SPDRP = 0x0000001B // Device Characteristics (R/W)
+	SPDRP_ADDRESS                     SPDRP = 0x0000001C // Device Address (R)
+	SPDRP_UI_NUMBER_DESC_FORMAT       SPDRP = 0x0000001D // UiNumberDescFormat (R/W)
+	SPDRP_DEVICE_POWER_DATA           SPDRP = 0x0000001E // Device Power Data (R)
+	SPDRP_REMOVAL_POLICY              SPDRP = 0x0000001F // Removal Policy (R)
+	SPDRP_REMOVAL_POLICY_HW_DEFAULT   SPDRP = 0x00000020 // Hardware Removal Policy (R)
+	SPDRP_REMOVAL_POLICY_OVERRIDE     SPDRP = 0x00000021 // Removal Policy Override (RW)
+	SPDRP_INSTALL_STATE               SPDRP = 0x00000022 // Device Install State (R)
+	SPDRP_LOCATION_PATHS              SPDRP = 0x00000023 // Device Location Paths (R)
+	SPDRP_BASE_CONTAINERID            SPDRP = 0x00000024 // Base ContainerID (R)
+
+	SPDRP_MAXIMUM_PROPERTY SPDRP = 0x00000025 // Upper bound on ordinals
+)
diff --git a/tun/wintun/setupapi/zsetupapi_windows.go b/tun/wintun/setupapi/zsetupapi_windows.go
new file mode 100644
index 0000000..853b6a7
--- /dev/null
+++ b/tun/wintun/setupapi/zsetupapi_windows.go
@@ -0,0 +1,370 @@
+// Code generated by 'go generate'; DO NOT EDIT.
+
+package setupapi
+
+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 (
+	modsetupapi = windows.NewLazySystemDLL("setupapi.dll")
+
+	procSetupDiCreateDeviceInfoListExW    = modsetupapi.NewProc("SetupDiCreateDeviceInfoListExW")
+	procSetupDiGetDeviceInfoListDetailW   = modsetupapi.NewProc("SetupDiGetDeviceInfoListDetailW")
+	procSetupDiCreateDeviceInfoW          = modsetupapi.NewProc("SetupDiCreateDeviceInfoW")
+	procSetupDiEnumDeviceInfo             = modsetupapi.NewProc("SetupDiEnumDeviceInfo")
+	procSetupDiDestroyDeviceInfoList      = modsetupapi.NewProc("SetupDiDestroyDeviceInfoList")
+	procSetupDiBuildDriverInfoList        = modsetupapi.NewProc("SetupDiBuildDriverInfoList")
+	procSetupDiCancelDriverInfoSearch     = modsetupapi.NewProc("SetupDiCancelDriverInfoSearch")
+	procSetupDiEnumDriverInfoW            = modsetupapi.NewProc("SetupDiEnumDriverInfoW")
+	procSetupDiGetSelectedDriverW         = modsetupapi.NewProc("SetupDiGetSelectedDriverW")
+	procSetupDiSetSelectedDriverW         = modsetupapi.NewProc("SetupDiSetSelectedDriverW")
+	procSetupDiGetDriverInfoDetailW       = modsetupapi.NewProc("SetupDiGetDriverInfoDetailW")
+	procSetupDiDestroyDriverInfoList      = modsetupapi.NewProc("SetupDiDestroyDriverInfoList")
+	procSetupDiGetClassDevsExW            = modsetupapi.NewProc("SetupDiGetClassDevsExW")
+	procSetupDiCallClassInstaller         = modsetupapi.NewProc("SetupDiCallClassInstaller")
+	procSetupDiOpenDevRegKey              = modsetupapi.NewProc("SetupDiOpenDevRegKey")
+	procSetupDiGetDeviceRegistryPropertyW = modsetupapi.NewProc("SetupDiGetDeviceRegistryPropertyW")
+	procSetupDiSetDeviceRegistryPropertyW = modsetupapi.NewProc("SetupDiSetDeviceRegistryPropertyW")
+	procSetupDiGetDeviceInstallParamsW    = modsetupapi.NewProc("SetupDiGetDeviceInstallParamsW")
+	procSetupDiGetClassInstallParamsW     = modsetupapi.NewProc("SetupDiGetClassInstallParamsW")
+	procSetupDiSetDeviceInstallParamsW    = modsetupapi.NewProc("SetupDiSetDeviceInstallParamsW")
+	procSetupDiSetClassInstallParamsW     = modsetupapi.NewProc("SetupDiSetClassInstallParamsW")
+	procSetupDiClassNameFromGuidExW       = modsetupapi.NewProc("SetupDiClassNameFromGuidExW")
+	procSetupDiClassGuidsFromNameExW      = modsetupapi.NewProc("SetupDiClassGuidsFromNameExW")
+	procSetupDiGetSelectedDevice          = modsetupapi.NewProc("SetupDiGetSelectedDevice")
+	procSetupDiSetSelectedDevice          = modsetupapi.NewProc("SetupDiSetSelectedDevice")
+)
+
+func setupDiCreateDeviceInfoListEx(classGUID *windows.GUID, hwndParent uintptr, machineName *uint16, reserved uintptr) (handle DevInfo, err error) {
+	r0, _, e1 := syscall.Syscall6(procSetupDiCreateDeviceInfoListExW.Addr(), 4, uintptr(unsafe.Pointer(classGUID)), uintptr(hwndParent), uintptr(unsafe.Pointer(machineName)), uintptr(reserved), 0, 0)
+	handle = DevInfo(r0)
+	if handle == DevInfo(windows.InvalidHandle) {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiGetDeviceInfoListDetail(deviceInfoSet DevInfo, deviceInfoSetDetailData *_SP_DEVINFO_LIST_DETAIL_DATA) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiGetDeviceInfoListDetailW.Addr(), 2, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoSetDetailData)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiCreateDeviceInfo(deviceInfoSet DevInfo, DeviceName *uint16, classGUID *windows.GUID, DeviceDescription *uint16, hwndParent uintptr, CreationFlags DICD, deviceInfoData *SP_DEVINFO_DATA) (err error) {
+	r1, _, e1 := syscall.Syscall9(procSetupDiCreateDeviceInfoW.Addr(), 7, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(DeviceName)), uintptr(unsafe.Pointer(classGUID)), uintptr(unsafe.Pointer(DeviceDescription)), uintptr(hwndParent), uintptr(CreationFlags), uintptr(unsafe.Pointer(deviceInfoData)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiEnumDeviceInfo(deviceInfoSet DevInfo, memberIndex uint32, deviceInfoData *SP_DEVINFO_DATA) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiEnumDeviceInfo.Addr(), 3, uintptr(deviceInfoSet), uintptr(memberIndex), uintptr(unsafe.Pointer(deviceInfoData)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetupDiDestroyDeviceInfoList(deviceInfoSet DevInfo) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiDestroyDeviceInfoList.Addr(), 1, uintptr(deviceInfoSet), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetupDiBuildDriverInfoList(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiBuildDriverInfoList.Addr(), 3, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(driverType))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetupDiCancelDriverInfoSearch(deviceInfoSet DevInfo) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiCancelDriverInfoSearch.Addr(), 1, uintptr(deviceInfoSet), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiEnumDriverInfo(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT, memberIndex uint32, driverInfoData *SP_DRVINFO_DATA) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetupDiEnumDriverInfoW.Addr(), 5, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(driverType), uintptr(memberIndex), uintptr(unsafe.Pointer(driverInfoData)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiGetSelectedDriver(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverInfoData *SP_DRVINFO_DATA) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiGetSelectedDriverW.Addr(), 3, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(unsafe.Pointer(driverInfoData)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetupDiSetSelectedDriver(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverInfoData *SP_DRVINFO_DATA) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiSetSelectedDriverW.Addr(), 3, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(unsafe.Pointer(driverInfoData)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiGetDriverInfoDetail(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverInfoData *SP_DRVINFO_DATA, driverInfoDetailData *_SP_DRVINFO_DETAIL_DATA, driverInfoDetailDataSize uint32, requiredSize *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetupDiGetDriverInfoDetailW.Addr(), 6, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(unsafe.Pointer(driverInfoData)), uintptr(unsafe.Pointer(driverInfoDetailData)), uintptr(driverInfoDetailDataSize), uintptr(unsafe.Pointer(requiredSize)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetupDiDestroyDriverInfoList(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, driverType SPDIT) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiDestroyDriverInfoList.Addr(), 3, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(driverType))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiGetClassDevsEx(classGUID *windows.GUID, Enumerator *uint16, hwndParent uintptr, Flags DIGCF, deviceInfoSet DevInfo, machineName *uint16, reserved uintptr) (handle DevInfo, err error) {
+	r0, _, e1 := syscall.Syscall9(procSetupDiGetClassDevsExW.Addr(), 7, uintptr(unsafe.Pointer(classGUID)), uintptr(unsafe.Pointer(Enumerator)), uintptr(hwndParent), uintptr(Flags), uintptr(deviceInfoSet), uintptr(unsafe.Pointer(machineName)), uintptr(reserved), 0, 0)
+	handle = DevInfo(r0)
+	if handle == DevInfo(windows.InvalidHandle) {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetupDiCallClassInstaller(installFunction DI_FUNCTION, deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiCallClassInstaller.Addr(), 3, uintptr(installFunction), uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiOpenDevRegKey(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, Scope DICS_FLAG, HwProfile uint32, KeyType DIREG, samDesired uint32) (key windows.Handle, err error) {
+	r0, _, e1 := syscall.Syscall6(procSetupDiOpenDevRegKey.Addr(), 6, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(Scope), uintptr(HwProfile), uintptr(KeyType), uintptr(samDesired))
+	key = windows.Handle(r0)
+	if key == windows.InvalidHandle {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiGetDeviceRegistryProperty(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, property SPDRP, propertyRegDataType *uint32, propertyBuffer *byte, propertyBufferSize uint32, requiredSize *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall9(procSetupDiGetDeviceRegistryPropertyW.Addr(), 7, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(property), uintptr(unsafe.Pointer(propertyRegDataType)), uintptr(unsafe.Pointer(propertyBuffer)), uintptr(propertyBufferSize), uintptr(unsafe.Pointer(requiredSize)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiSetDeviceRegistryProperty(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, property SPDRP, propertyBuffer *byte, propertyBufferSize uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetupDiSetDeviceRegistryPropertyW.Addr(), 5, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(property), uintptr(unsafe.Pointer(propertyBuffer)), uintptr(propertyBufferSize), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiGetDeviceInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, deviceInstallParams *_SP_DEVINSTALL_PARAMS) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiGetDeviceInstallParamsW.Addr(), 3, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(unsafe.Pointer(deviceInstallParams)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetupDiGetClassInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, classInstallParams *SP_CLASSINSTALL_HEADER, classInstallParamsSize uint32, requiredSize *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetupDiGetClassInstallParamsW.Addr(), 5, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(unsafe.Pointer(classInstallParams)), uintptr(classInstallParamsSize), uintptr(unsafe.Pointer(requiredSize)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiSetDeviceInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, deviceInstallParams *_SP_DEVINSTALL_PARAMS) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiSetDeviceInstallParamsW.Addr(), 3, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(unsafe.Pointer(deviceInstallParams)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetupDiSetClassInstallParams(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA, classInstallParams *SP_CLASSINSTALL_HEADER, classInstallParamsSize uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetupDiSetClassInstallParamsW.Addr(), 4, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), uintptr(unsafe.Pointer(classInstallParams)), uintptr(classInstallParamsSize), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiClassNameFromGuidEx(classGUID *windows.GUID, className *uint16, classNameSize uint32, requiredSize *uint32, machineName *uint16, reserved uintptr) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetupDiClassNameFromGuidExW.Addr(), 6, uintptr(unsafe.Pointer(classGUID)), uintptr(unsafe.Pointer(className)), uintptr(classNameSize), uintptr(unsafe.Pointer(requiredSize)), uintptr(unsafe.Pointer(machineName)), uintptr(reserved))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiClassGuidsFromNameEx(className *uint16, classGuidList *windows.GUID, classGuidListSize uint32, requiredSize *uint32, machineName *uint16, reserved uintptr) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetupDiClassGuidsFromNameExW.Addr(), 6, uintptr(unsafe.Pointer(className)), uintptr(unsafe.Pointer(classGuidList)), uintptr(classGuidListSize), uintptr(unsafe.Pointer(requiredSize)), uintptr(unsafe.Pointer(machineName)), uintptr(reserved))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func setupDiGetSelectedDevice(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiGetSelectedDevice.Addr(), 2, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetupDiSetSelectedDevice(deviceInfoSet DevInfo, deviceInfoData *SP_DEVINFO_DATA) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetupDiSetSelectedDevice.Addr(), 2, uintptr(deviceInfoSet), uintptr(unsafe.Pointer(deviceInfoData)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
diff --git a/tun/wintun/setupapi/zsetupapi_windows_test.go b/tun/wintun/setupapi/zsetupapi_windows_test.go
new file mode 100644
index 0000000..09b9195
--- /dev/null
+++ b/tun/wintun/setupapi/zsetupapi_windows_test.go
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package setupapi
+
+import (
+	"syscall"
+	"testing"
+
+	"golang.org/x/sys/windows"
+)
+
+func TestSetupDiDestroyDeviceInfoList(t *testing.T) {
+	err := SetupDiDestroyDeviceInfoList(DevInfo(windows.InvalidHandle))
+	if errWin, ok := err.(syscall.Errno); !ok || errWin != 6 /*ERROR_INVALID_HANDLE*/ {
+		t.Errorf("SetupDiDestroyDeviceInfoList(nil, ...) should fail with ERROR_INVALID_HANDLE")
+	}
+}
diff --git a/tun/wintun/wintun_windows.go b/tun/wintun/wintun_windows.go
new file mode 100644
index 0000000..1413c24
--- /dev/null
+++ b/tun/wintun/wintun_windows.go
@@ -0,0 +1,461 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package wintun
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"syscall"
+	"time"
+	"unsafe"
+
+	"git.zx2c4.com/wireguard-go/tun/wintun/guid"
+	"git.zx2c4.com/wireguard-go/tun/wintun/setupapi"
+	"golang.org/x/sys/windows"
+	"golang.org/x/sys/windows/registry"
+)
+
+type Wintun windows.GUID
+
+var deviceClassNetGUID = windows.GUID{0x4d36e972, 0xe325, 0x11ce, [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
+
+const TUN_HWID = "Wintun"
+
+//
+// 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.
+//
+func GetInterface(ifname string, hwndParent uintptr) (*Wintun, error) {
+	// Create a list of network devices.
+	devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
+	if err != nil {
+		return nil, err
+	}
+	defer devInfoList.Close()
+
+	// Retrieve information associated with a device information set.
+	// TODO: Is this really necessary?
+	_, err = devInfoList.GetDeviceInfoListDetail()
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: If we're certain we want case-insensitive name comparison, please document the rationale.
+	ifname = strings.ToLower(ifname)
+
+	// Iterate.
+	for index := 0; ; index++ {
+		// Get the device from the list.
+		deviceData, err := devInfoList.EnumDeviceInfo(index)
+		if err != nil {
+			if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
+				break
+			}
+			// Something is wrong with this device. Skip it.
+			continue
+		}
+
+		// Get interface ID.
+		ifid, err := getInterfaceId(devInfoList, deviceData, 1)
+		if err != nil {
+			// Something is wrong with this device. Skip it.
+			continue
+		}
+
+		// Get interface name.
+		ifname2, err := ((*Wintun)(ifid)).GetInterfaceName()
+		if err != nil {
+			// Something is wrong with this device. Skip it.
+			continue
+		}
+
+		if ifname == strings.ToLower(ifname2) {
+			// Interface name found.
+			return (*Wintun)(ifid), nil
+		}
+	}
+
+	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, "")
+	if err != nil {
+		return nil, false, err
+	}
+
+	// Get the device class name from GUID.
+	className, err := setupapi.SetupDiClassNameFromGuidEx(&deviceClassNetGUID, "")
+	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(TUN_HWID)
+	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(TUN_HWID) {
+				// 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", TUN_HWID)
+	}
+
+	// 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 ifid *windows.GUID
+	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 ID from registry. Retry for max 30sec.
+		ifid, err = getInterfaceId(devInfoList, deviceData, 30)
+	}
+
+	if err == nil {
+		return (*Wintun)(ifid), rebootRequired, nil
+	}
+
+	// The interface failed to install, or the interface ID was unobtainable. Clean-up.
+	removeDeviceParams := setupapi.SP_REMOVEDEVICE_PARAMS{
+		ClassInstallHeader: setupapi.SP_CLASSINSTALL_HEADER{
+			InstallFunction: setupapi.DIF_REMOVE,
+		},
+		Scope: setupapi.DI_REMOVEDEVICE_GLOBAL,
+	}
+	removeDeviceParams.ClassInstallHeader.Size = uint32(unsafe.Sizeof(removeDeviceParams.ClassInstallHeader))
+
+	// 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, "", hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
+	if err != nil {
+		return false, false, err
+	}
+	defer devInfoList.Close()
+
+	// Retrieve information associated with a device information set.
+	// TODO: Is this really necessary?
+	_, err = devInfoList.GetDeviceInfoListDetail()
+	if err != nil {
+		return false, false, err
+	}
+
+	// Iterate.
+	for index := 0; ; index++ {
+		// Get the device from the list.
+		deviceData, err := devInfoList.EnumDeviceInfo(index)
+		if err != nil {
+			if errWin, ok := err.(syscall.Errno); ok && errWin == 259 /*ERROR_NO_MORE_ITEMS*/ {
+				break
+			}
+			// Something is wrong with this device. Skip it.
+			continue
+		}
+
+		// Get interface ID.
+		ifid2, err := getInterfaceId(devInfoList, deviceData, 1)
+		if err != nil {
+			// Something is wrong with this device. Skip it.
+			continue
+		}
+
+		if ifid == ifid2 {
+			// Remove the device.
+			removeDeviceParams := setupapi.SP_REMOVEDEVICE_PARAMS{
+				ClassInstallHeader: setupapi.SP_CLASSINSTALL_HEADER{
+					InstallFunction: setupapi.DIF_REMOVE,
+				},
+				Scope: setupapi.DI_REMOVEDEVICE_GLOBAL,
+			}
+			removeDeviceParams.ClassInstallHeader.Size = uint32(unsafe.Sizeof(removeDeviceParams.ClassInstallHeader))
+
+			// 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
+}
+
+///
+/// checkReboot checks device install parameters if a system reboot is required.
+///
+func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.SP_DEVINFO_DATA) (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
+}
+
+// getInterfaceId returns network interface ID.
+//
+// After the device is created, it might take some time before the registry
+// key is populated. numAttempts parameter specifies the number of attempts
+// to read NetCfgInstanceId value from registry. A 1sec sleep is inserted
+// between retry attempts.
+//
+// Function returns the network interface ID.
+//
+func getInterfaceId(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.SP_DEVINFO_DATA, numAttempts int) (*windows.GUID, error) {
+	if numAttempts < 1 {
+		return nil, fmt.Errorf("Invalid numAttempts (expected: >=1, provided: %v)", numAttempts)
+	}
+
+	// Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\<class>\<id> registry key.
+	key, err := deviceInfoSet.OpenDevRegKey(deviceInfoData, 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 key.Close()
+
+	for {
+		// Query the NetCfgInstanceId value. Using get_reg_string() right on might clutter the output with error messages while the registry is still being populated.
+		_, _, err = key.GetValue("NetCfgInstanceId", nil)
+		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 := guid.FromString(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 (wintun *Wintun) GetInterfaceName() (string, error) {
+	ifid := (*windows.GUID)(wintun)
+	// Open network interface registry key.
+	key, err := registry.OpenKey(registry.LOCAL_MACHINE, fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guid.ToString(&deviceClassNetGUID), guid.ToString(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 (wintun *Wintun) SetInterfaceName(ifname string) error {
+	ifid := (*windows.GUID)(wintun)
+	// Open network interface registry key.
+	key, err := registry.OpenKey(registry.LOCAL_MACHINE, fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guid.ToString(&deviceClassNetGUID), guid.ToString(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)
+}
+
+//
+// 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
+}
+
+func (wintun *Wintun) SignalEventName() string {
+	return fmt.Sprintf("Global\\WINTUN_EVENT_%s", guid.ToString((*windows.GUID)(wintun)))
+}
+
+func (wintun *Wintun) DataFileName() string {
+	return fmt.Sprintf("\\\\.\\Global\\WINTUN_DEVICE_%s", guid.ToString((*windows.GUID)(wintun)))
+}
\ No newline at end of file