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wintun: fix comments and remove hwnd param

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This now looks more idiomatic.
This commit is contained in:
Jason A. Donenfeld 2019-06-10 11:02:18 +02:00
parent baafe92888
commit a304f69e0d
2 changed files with 54 additions and 123 deletions
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10
tun/tun_windows.go
View file

@ -72,24 +72,24 @@ func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID) (TUN
var wt *wintun.Wintun
// Does an interface with this name already exist?
wt, err = wintun.GetInterface(ifname, 0)
wt, err = wintun.GetInterface(ifname)
if err == nil {
// If so, we delete it, in case it has weird residual configuration.
_, err = wt.DeleteInterface(0)
_, err = wt.DeleteInterface()
if err != nil {
return nil, fmt.Errorf("Unable to delete already existing Wintun interface: %v", err)
}
} else if err == windows.ERROR_ALREADY_EXISTS {
return nil, fmt.Errorf("Foreign network interface with the same name exists")
}
wt, _, err = wintun.CreateInterface("WireGuard Tunnel Adapter", requestedGUID, 0)
wt, _, err = wintun.CreateInterface("WireGuard Tunnel Adapter", requestedGUID)
if err != nil {
return nil, fmt.Errorf("Unable to create Wintun interface: %v", err)
}
err = wt.SetInterfaceName(ifname)
if err != nil {
wt.DeleteInterface(0)
wt.DeleteInterface()
return nil, fmt.Errorf("Unable to set name of Wintun interface: %v", err)
}
@ -214,7 +214,7 @@ func (tun *NativeTun) Close() error {
close(tun.events)
}
_, err2 := tun.wt.DeleteInterface(0)
_, err2 := tun.wt.DeleteInterface()
if err1 == nil {
err1 = err2
}

153
tun/wintun/wintun_windows.go
View file

@ -20,9 +20,7 @@ import (
"golang.zx2c4.com/wireguard/tun/wintun/setupapi"
)
//
// Wintun is a handle of a Wintun adapter
//
// Wintun is a handle of a Wintun adapter.
type Wintun struct {
cfgInstanceID windows.GUID
luidIndex uint32
@ -31,14 +29,12 @@ type Wintun struct {
var deviceClassNetGUID = windows.GUID{Data1: 0x4d36e972, Data2: 0xe325, Data3: 0x11ce, Data4: [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
const hardwareID = "Wintun"
const enumerator = ""
const machineName = ""
const waitForRegistryTimeout = time.Second * 5
const (
hardwareID = "Wintun"
waitForRegistryTimeout = time.Second * 5
)
//
// MakeWintun creates interface handle and populates it from device registry key
//
// makeWintun creates a Wintun interface handle and populates it from the device's registry key.
func makeWintun(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) (*Wintun, error) {
// 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.QUERY_VALUE)
@ -78,22 +74,13 @@ func makeWintun(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfo
}, nil
}
//
// GetInterface finds interface 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 if found, or windows.ERROR_OBJECT_NOT_FOUND
// otherwise. If the interface is found but not Wintun-class, the function
// returns windows.ERROR_ALREADY_EXISTS.
//
func GetInterface(ifname string, hwndParent uintptr) (*Wintun, error) {
// GetInterface finds a Wintun interface by its name. This function returns
// the interface if found, or windows.ERROR_OBJECT_NOT_FOUND otherwise. If
// the interface is found but not a Wintun-class, this function returns
// windows.ERROR_ALREADY_EXISTS.
func GetInterface(ifname string) (*Wintun, error) {
// Create a list of network devices.
devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, enumerator, hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), machineName)
devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
if err != nil {
return nil, fmt.Errorf("SetupDiGetClassDevsEx(%v) failed: %v", deviceClassNetGUID, err)
}
@ -170,53 +157,40 @@ func GetInterface(ifname string, hwndParent uintptr) (*Wintun, error) {
return nil, windows.ERROR_OBJECT_NOT_FOUND
}
// CreateInterface creates a Wintun interface. description is a string that
// supplies the text description of the device. The description is optional
// and can be "". requestedGUID is the GUID of the created network interface,
// which then influences NLA generation deterministically. If it is set to nil,
// the GUID is chosen by the system at random, and hence a new NLA entry is
// created for each new interface. It is called "requested" GUID because the
// API it uses is completely undocumented, and so there could be minor
// interesting complications with its usage. This function returns the network
// interface ID and a flag if reboot is required.
//
// CreateInterface creates a TUN interface.
//
// description is a string that supplies the text description of the device.
// description is optional and can be "".
//
// requestedGUID is the GUID of the created network interface, which then
// influences NLA generation deterministically. If it is set to nil, the GUID
// is chosen by the system at random, and hence a new NLA entry is created for
// each new interface. It is called "requested" GUID because the API it uses
// is completely undocumented, and so there could be minor interesting
// complications with its usage.
//
// 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, requestedGUID *windows.GUID, hwndParent uintptr) (*Wintun, bool, error) {
func CreateInterface(description string, requestedGUID *windows.GUID) (wintun *Wintun, rebootRequired bool, err error) {
// Create an empty device info set for network adapter device class.
devInfoList, err := setupapi.SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, hwndParent, machineName)
devInfoList, err := setupapi.SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, 0, "")
if err != nil {
return nil, false, fmt.Errorf("SetupDiCreateDeviceInfoListEx(%v) failed: %v", deviceClassNetGUID, err)
}
defer devInfoList.Close()
// Get the device class name from GUID.
className, err := setupapi.SetupDiClassNameFromGuidEx(&deviceClassNetGUID, machineName)
className, err := setupapi.SetupDiClassNameFromGuidEx(&deviceClassNetGUID, "")
if err != nil {
return nil, false, fmt.Errorf("SetupDiClassNameFromGuidEx(%v) failed: %v", deviceClassNetGUID, 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)
deviceData, err := devInfoList.CreateDeviceInfo(className, &deviceClassNetGUID, description, 0, setupapi.DICD_GENERATE_ID)
if err != nil {
return nil, false, fmt.Errorf("SetupDiCreateDeviceInfo failed: %v", err)
}
if hwndParent == 0 {
err = setQuietInstall(devInfoList, deviceData)
if err != nil {
return nil, false, fmt.Errorf("Setting quiet installation failed: %v", err)
}
}
// Set a device information element as the selected member of a device information set.
err = devInfoList.SetSelectedDevice(deviceData)
@ -308,10 +282,7 @@ func CreateInterface(description string, requestedGUID *windows.GUID, hwndParent
err = fmt.Errorf("SetupDiCallClassInstaller(DIF_INSTALLDEVICE) failed: %v", err)
}
var wintun *Wintun
var rebootRequired bool
var key registry.Key
if err == nil {
// Check if a system reboot is required. (Ignore errors)
if ret, _ := checkReboot(devInfoList, deviceData); ret {
@ -426,21 +397,11 @@ func CreateInterface(description string, requestedGUID *windows.GUID, hwndParent
return nil, rebootRequired, 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 silently succeeds if the interface was not found.
//
// Function returns true if a reboot is required.
//
func (wintun *Wintun) DeleteInterface(hwndParent uintptr) (bool, error) {
devInfoList, deviceData, err := wintun.deviceData(hwndParent)
// DeleteInterface deletes a Wintun interface. This function succeeds
// if the interface was not found. It returns a bool indicating whether
// a reboot is required.
func (wintun *Wintun) DeleteInterface() (rebootRequired bool, err error) {
devInfoList, deviceData, err := wintun.deviceData()
if err == windows.ERROR_OBJECT_NOT_FOUND {
return false, nil
}
@ -468,13 +429,11 @@ func (wintun *Wintun) DeleteInterface(hwndParent uintptr) (bool, error) {
}
// Check if a system reboot is required. (Ignore errors)
ret, _ := checkReboot(devInfoList, deviceData)
return ret, nil
rebootRequired, _ = checkReboot(devInfoList, deviceData)
return rebootRequired, nil
}
//
// checkReboot checks device install parameters if a system reboot is required.
//
func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) (bool, error) {
devInstallParams, err := deviceInfoSet.DeviceInstallParams(deviceInfoData)
if err != nil {
@ -484,9 +443,7 @@ func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInf
return (devInstallParams.Flags & (setupapi.DI_NEEDREBOOT | setupapi.DI_NEEDRESTART)) != 0, nil
}
//
// setQuietInstall sets device install parameters for a quiet installation
//
func setQuietInstall(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) error {
devInstallParams, err := deviceInfoSet.DeviceInstallParams(deviceInfoData)
if err != nil {
@ -497,9 +454,7 @@ func setQuietInstall(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.De
return deviceInfoSet.SetDeviceInstallParams(deviceInfoData, devInstallParams)
}
//
// InterfaceName returns network interface name.
//
// InterfaceName returns the name of the Wintun interface.
func (wintun *Wintun) InterfaceName() (string, error) {
key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.netRegKeyName(), registry.QUERY_VALUE)
if err != nil {
@ -511,9 +466,7 @@ func (wintun *Wintun) InterfaceName() (string, error) {
return registryEx.GetStringValue(key, "Name")
}
//
// SetInterfaceName sets network interface name.
//
// SetInterfaceName sets name of the Wintun interface.
func (wintun *Wintun) SetInterfaceName(ifname string) error {
// We have to tell the various runtime COM services about the new name too. We ignore the
// error because netshell isn't available on servercore.
@ -530,23 +483,17 @@ func (wintun *Wintun) SetInterfaceName(ifname string) error {
return key.SetStringValue("Name", ifname)
}
//
// netRegKeyName returns interface-specific network registry key name.
//
// netRegKeyName returns the interface-specific network registry key name.
func (wintun *Wintun) netRegKeyName() string {
return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", deviceClassNetGUID, wintun.cfgInstanceID)
}
//
// tcpipAdapterRegKeyName returns adapter-specific TCP/IP network registry key name.
//
// tcpipAdapterRegKeyName returns the adapter-specific TCP/IP network registry key name.
func (wintun *Wintun) tcpipAdapterRegKeyName() string {
return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Adapters\\%v", wintun.cfgInstanceID)
}
//
// tcpipInterfaceRegKeyName returns interface-specific TCP/IP network registry key name.
//
// tcpipInterfaceRegKeyName returns the interface-specific TCP/IP network registry key name.
func (wintun *Wintun) tcpipInterfaceRegKeyName() (path string, err error) {
key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.tcpipAdapterRegKeyName(), registry.QUERY_VALUE)
if err != nil {
@ -563,23 +510,16 @@ func (wintun *Wintun) tcpipInterfaceRegKeyName() (path string, err error) {
return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Services\\%s", paths[0]), nil
}
//
// deviceData returns TUN device info list handle and interface device info
// data.
//
// The device info list handle must be closed after use.
//
// In case the device is not found, windows.ERROR_OBJECT_NOT_FOUND is
// returned.
//
func (wintun *Wintun) deviceData(hwndParent uintptr) (setupapi.DevInfo, *setupapi.DevInfoData, error) {
// data. The device info list handle must be closed after use. In case the
// device is not found, windows.ERROR_OBJECT_NOT_FOUND is returned.
func (wintun *Wintun) deviceData() (setupapi.DevInfo, *setupapi.DevInfoData, error) {
// Create a list of network devices.
devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, enumerator, hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), machineName)
devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
if err != nil {
return 0, nil, fmt.Errorf("SetupDiGetClassDevsEx(%v) failed: %v", deviceClassNetGUID, err.Error())
}
// Iterate.
for index := 0; ; index++ {
// Get the device from the list. Should anything be wrong with this device, continue with next.
deviceData, err := devInfoList.EnumDeviceInfo(index)
@ -598,14 +538,11 @@ func (wintun *Wintun) deviceData(hwndParent uintptr) (setupapi.DevInfo, *setupap
}
if wintun.cfgInstanceID == wintun2.cfgInstanceID {
if hwndParent == 0 {
err = setQuietInstall(devInfoList, deviceData)
if err != nil {
devInfoList.Close()
return 0, nil, fmt.Errorf("Setting quiet installation failed: %v", err)
}
}
return devInfoList, deviceData, nil
}
}
@ -614,23 +551,17 @@ func (wintun *Wintun) deviceData(hwndParent uintptr) (setupapi.DevInfo, *setupap
return 0, nil, windows.ERROR_OBJECT_NOT_FOUND
}
//
// DataFileName returns Wintun device data pipe name.
//
// DataFileName returns the Wintun device data pipe name.
func (wintun *Wintun) DataFileName() string {
return fmt.Sprintf("\\\\.\\Global\\WINTUN%d", wintun.luidIndex)
}
//
// GUID returns the GUID of the interface.
//
func (wintun *Wintun) GUID() windows.GUID {
return wintun.cfgInstanceID
}
//
// LUID returns the LUID of the interface.
//
func (wintun *Wintun) LUID() uint64 {
return ((uint64(wintun.luidIndex) & ((1 << 24) - 1)) << 24) | ((uint64(wintun.ifType) & ((1 << 16) - 1)) << 48)
}