snow/wireguard-go
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

wintun: Introduce new package for obscuring Windows bits

Browse source
This commit is contained in:
Jason A. Donenfeld 2019-02-07 04:18:27 +01:00
parent 306d08e692
commit ea59177f1c
12 changed files with 527 additions and 487 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
setupapi/setupapi.go
View file

@ -1,6 +0,0 @@
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package setupapi

493
tun/tun_windows.go
View file

@ -5,20 +5,14 @@
package tun
//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output ztun_windows.go tun_windows.go
import (
"errors"
"fmt"
"os"
"strings"
"syscall"
"time"
"unsafe"
"git.zx2c4.com/wireguard-go/setupapi"
"git.zx2c4.com/wireguard-go/tun/wintun"
"golang.org/x/sys/windows"
"golang.org/x/sys/windows/registry"
)
const (
@ -34,10 +28,6 @@ const (
TUN_SIGNAL_MAX = 2
)
var deviceClassNetGUID = windows.GUID{0x4d36e972, 0xe325, 0x11ce, [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
const TUN_HWID = "Wintun"
type tunPacket struct {
size uint32
data [TUN_MAX_PACKET_SIZE]byte
@ -50,7 +40,7 @@ type tunRWQueue struct {
}
type nativeTun struct {
ifid *windows.GUID
wt *wintun.Wintun
tunName string
signalName *uint16
tunFile *os.File
@ -64,30 +54,28 @@ type nativeTun struct {
func CreateTUN(ifname string) (TUNDevice, error) {
// Does an interface with this name already exist?
ifid, err := getInterface(ifname, 0)
if ifid == nil || err != nil {
wt, err := wintun.GetInterface(ifname, 0)
if wt == nil || err != nil {
// Interface does not exist or an error occured. Create one.
ifid, _, err = createInterface("WireGuard Tunnel Adapter", 0)
wt, _, err = wintun.CreateInterface("WireGuard Tunnel Adapter", 0)
if err != nil {
return nil, err
}
// Set interface name. (Ignore errors.)
setInterfaceName(ifid, ifname)
wt.SetInterfaceName(ifname)
}
ifidStr := guidToString(ifid)
signalNameUTF16, err := windows.UTF16PtrFromString(fmt.Sprintf("Global\\WINTUN_EVENT_%s", ifidStr))
signalNameUTF16, err := windows.UTF16PtrFromString(wt.SignalEventName())
if err != nil {
deleteInterface(ifid, 0)
wt.DeleteInterface(0)
return nil, err
}
// Create instance.
tun := &nativeTun{
ifid: ifid,
tunName: fmt.Sprintf("\\\\.\\Global\\WINTUN_DEVICE_%s", ifidStr),
wt: wt,
tunName: wt.DataFileName(),
signalName: signalNameUTF16,
events: make(chan TUNEvent, 10),
errors: make(chan error, 1),
@ -96,7 +84,7 @@ func CreateTUN(ifname string) (TUNDevice, error) {
// Create close event.
tun.signals[TUN_SIGNAL_CLOSE], err = windows.CreateEvent(nil, 1 /*TRUE*/, 0 /*FALSE*/, nil)
if err != nil {
deleteInterface(ifid, 0)
wt.DeleteInterface(0)
return nil, err
}
@ -160,7 +148,7 @@ func (tun *nativeTun) closeTUN() (err error) {
}
func (tun *nativeTun) Name() (string, error) {
return getInterfaceName(tun.ifid)
return tun.wt.GetInterfaceName()
}
func (tun *nativeTun) File() *os.File {
@ -184,7 +172,7 @@ func (tun *nativeTun) Close() error {
close(tun.events)
}
_, _, e = deleteInterface(tun.ifid, 0)
_, _, e = tun.wt.DeleteInterface(0)
if err == nil {
err = e
}
@ -317,458 +305,3 @@ func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
// Flush write buffer.
return len(buff) - offset, tun.flush()
}
//
// 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) (*windows.GUID, 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 := getInterfaceName(ifid)
if err != nil {
// Something is wrong with this device. Skip it.
continue
}
if ifname == strings.ToLower(ifname2) {
// Interface name found.
return 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) (*windows.GUID, 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 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 deleteInterface(ifid *windows.GUID, hwndParent uintptr) (bool, bool, error) {
// 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 := stringToGUID(value)
if err != nil {
return nil, fmt.Errorf("NetCfgInstanceId registry value is not a GUID (expected: \"{...}\", provided: \"%v\")", value)
}
return ifid, err
}
}
//
// getInterfaceName returns network interface name.
//
func getInterfaceName(ifid *windows.GUID) (string, error) {
// Open network interface registry key.
key, err := registry.OpenKey(registry.LOCAL_MACHINE, fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guidToString(&deviceClassNetGUID), guidToString(ifid)), registry.QUERY_VALUE)
if err != nil {
return "", errors.New("Network-specific registry key open failed: " + err.Error())
}
defer key.Close()
// Get the interface name.
return getRegStringValue(key, "Name")
}
//
// setInterfaceName sets network interface name.
//
func setInterfaceName(ifid *windows.GUID, ifname string) error {
// Open network interface registry key.
key, err := registry.OpenKey(registry.LOCAL_MACHINE, fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guidToString(&deviceClassNetGUID), guidToString(ifid)), registry.SET_VALUE)
if err != nil {
return errors.New("Network-specific registry key open failed: " + err.Error())
}
defer key.Close()
// Set the interface name.
return key.SetStringValue("Name", ifname)
}
//sys clsidFromString(lpsz *uint16, pclsid *windows.GUID) (hr int32) = ole32.CLSIDFromString
//
// stringToGUID parses "{XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}" string to GUID.
//
func stringToGUID(str string) (*windows.GUID, error) {
strUTF16, err := syscall.UTF16PtrFromString(str)
if err != nil {
return nil, err
}
guid := &windows.GUID{}
hr := clsidFromString(strUTF16, guid)
if hr < 0 {
return nil, syscall.Errno(hr)
}
return guid, nil
}
//
// guidToString function converts GUID to string
// "{XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}".
//
// The resulting string is uppercase.
//
func guidToString(guid *windows.GUID) string {
return fmt.Sprintf("{%06X-%04X-%04X-%04X-%012X}", guid.Data1, guid.Data2, guid.Data3, guid.Data4[:2], guid.Data4[2:])
}
//
// getRegStringValue function reads a string value from registry.
//
// If the value type is REG_EXPAND_SZ the environment variables are expanded.
// Should expanding fail, original string value and nil error are returned.
//
func getRegStringValue(key registry.Key, name string) (string, error) {
// Read string value.
value, valueType, err := key.GetStringValue(name)
if err != nil {
return "", err
}
if valueType != registry.EXPAND_SZ {
// Value does not require expansion.
return value, nil
}
valueExp, err := registry.ExpandString(value)
if err != nil {
// Expanding failed: return original sting value.
return value, nil
}
// Return expanded value.
return valueExp, nil
}

44
tun/wintun/guid/guid_windows.go Normal file
View file

@ -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:])
}

8
tun/wintun/guid/mksyscall.go Normal file
View file

@ -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

2
tun/ztun_windows.go → tun/wintun/guid/zguid_windows.go
View file

@ -1,6 +1,6 @@
// Code generated by 'go generate'; DO NOT EDIT.
package tun
package guid
import (
"syscall"

0
setupapi/mksyscall.go → tun/wintun/setupapi/mksyscall.go
View file

0
setupapi/setupapi_windows.go → tun/wintun/setupapi/setupapi_windows.go
View file

0
setupapi/setupapi_windows_test.go → tun/wintun/setupapi/setupapi_windows_test.go
View file

0
setupapi/types_windows.go → tun/wintun/setupapi/types_windows.go
View file

0
setupapi/zsetupapi_windows.go → tun/wintun/setupapi/zsetupapi_windows.go
View file

0
setupapi/zsetupapi_windows_test.go → tun/wintun/setupapi/zsetupapi_windows_test.go
View file

461
tun/wintun/wintun_windows.go Normal file
View file

@ -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)))
}