wintun: fix comments and remove hwnd param
This now looks more idiomatic.
This commit is contained in:
parent
baafe92888
commit
a304f69e0d
@ -72,24 +72,24 @@ func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID) (TUN
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var wt *wintun.Wintun
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// Does an interface with this name already exist?
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wt, err = wintun.GetInterface(ifname, 0)
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wt, err = wintun.GetInterface(ifname)
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if err == nil {
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// If so, we delete it, in case it has weird residual configuration.
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_, err = wt.DeleteInterface(0)
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_, err = wt.DeleteInterface()
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if err != nil {
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return nil, fmt.Errorf("Unable to delete already existing Wintun interface: %v", err)
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}
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} else if err == windows.ERROR_ALREADY_EXISTS {
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return nil, fmt.Errorf("Foreign network interface with the same name exists")
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}
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wt, _, err = wintun.CreateInterface("WireGuard Tunnel Adapter", requestedGUID, 0)
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wt, _, err = wintun.CreateInterface("WireGuard Tunnel Adapter", requestedGUID)
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if err != nil {
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return nil, fmt.Errorf("Unable to create Wintun interface: %v", err)
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}
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err = wt.SetInterfaceName(ifname)
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if err != nil {
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wt.DeleteInterface(0)
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wt.DeleteInterface()
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return nil, fmt.Errorf("Unable to set name of Wintun interface: %v", err)
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}
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@ -214,7 +214,7 @@ func (tun *NativeTun) Close() error {
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close(tun.events)
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}
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_, err2 := tun.wt.DeleteInterface(0)
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_, err2 := tun.wt.DeleteInterface()
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if err1 == nil {
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err1 = err2
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}
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@ -20,9 +20,7 @@ import (
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"golang.zx2c4.com/wireguard/tun/wintun/setupapi"
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)
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//
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// Wintun is a handle of a Wintun adapter
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//
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// Wintun is a handle of a Wintun adapter.
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type Wintun struct {
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cfgInstanceID windows.GUID
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luidIndex uint32
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@ -31,14 +29,12 @@ type Wintun struct {
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var deviceClassNetGUID = windows.GUID{Data1: 0x4d36e972, Data2: 0xe325, Data3: 0x11ce, Data4: [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
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const hardwareID = "Wintun"
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const enumerator = ""
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const machineName = ""
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const waitForRegistryTimeout = time.Second * 5
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const (
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hardwareID = "Wintun"
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waitForRegistryTimeout = time.Second * 5
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)
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//
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// MakeWintun creates interface handle and populates it from device registry key
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//
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// makeWintun creates a Wintun interface handle and populates it from the device's registry key.
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func makeWintun(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) (*Wintun, error) {
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// Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\<class>\<id> registry key.
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key, err := deviceInfoSet.OpenDevRegKey(deviceInfoData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.QUERY_VALUE)
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@ -78,22 +74,13 @@ func makeWintun(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfo
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}, nil
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}
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//
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// GetInterface finds interface by name.
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//
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// hwndParent is a handle to the top-level window to use for any user
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// interface that is related to non-device-specific actions (such as a select-
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// device dialog box that uses the global class driver list). This handle is
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// optional and can be 0. If a specific top-level window is not required, set
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// hwndParent to 0.
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//
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// Function returns interface if found, or windows.ERROR_OBJECT_NOT_FOUND
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// otherwise. If the interface is found but not Wintun-class, the function
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// returns windows.ERROR_ALREADY_EXISTS.
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//
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func GetInterface(ifname string, hwndParent uintptr) (*Wintun, error) {
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// GetInterface finds a Wintun interface by its name. This function returns
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// the interface if found, or windows.ERROR_OBJECT_NOT_FOUND otherwise. If
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// the interface is found but not a Wintun-class, this function returns
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// windows.ERROR_ALREADY_EXISTS.
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func GetInterface(ifname string) (*Wintun, error) {
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// Create a list of network devices.
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devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, enumerator, hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), machineName)
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devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
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if err != nil {
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return nil, fmt.Errorf("SetupDiGetClassDevsEx(%v) failed: %v", deviceClassNetGUID, err)
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}
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@ -170,52 +157,39 @@ func GetInterface(ifname string, hwndParent uintptr) (*Wintun, error) {
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return nil, windows.ERROR_OBJECT_NOT_FOUND
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}
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// CreateInterface creates a Wintun interface. description is a string that
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// supplies the text description of the device. The description is optional
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// and can be "". requestedGUID is the GUID of the created network interface,
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// which then influences NLA generation deterministically. If it is set to nil,
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// the GUID is chosen by the system at random, and hence a new NLA entry is
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// created for each new interface. It is called "requested" GUID because the
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// API it uses is completely undocumented, and so there could be minor
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// interesting complications with its usage. This function returns the network
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// interface ID and a flag if reboot is required.
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//
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// CreateInterface creates a TUN interface.
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//
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// description is a string that supplies the text description of the device.
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// description is optional and can be "".
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//
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// requestedGUID is the GUID of the created network interface, which then
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// influences NLA generation deterministically. If it is set to nil, the GUID
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// is chosen by the system at random, and hence a new NLA entry is created for
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// each new interface. It is called "requested" GUID because the API it uses
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// is completely undocumented, and so there could be minor interesting
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// complications with its usage.
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//
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// hwndParent is a handle to the top-level window to use for any user
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// interface that is related to non-device-specific actions (such as a select-
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// device dialog box that uses the global class driver list). This handle is
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// optional and can be 0. If a specific top-level window is not required, set
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// hwndParent to 0.
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//
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// Function returns the network interface ID and a flag if reboot is required.
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//
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func CreateInterface(description string, requestedGUID *windows.GUID, hwndParent uintptr) (*Wintun, bool, error) {
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func CreateInterface(description string, requestedGUID *windows.GUID) (wintun *Wintun, rebootRequired bool, err error) {
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// Create an empty device info set for network adapter device class.
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devInfoList, err := setupapi.SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, hwndParent, machineName)
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devInfoList, err := setupapi.SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, 0, "")
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if err != nil {
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return nil, false, fmt.Errorf("SetupDiCreateDeviceInfoListEx(%v) failed: %v", deviceClassNetGUID, err)
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}
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defer devInfoList.Close()
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// Get the device class name from GUID.
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className, err := setupapi.SetupDiClassNameFromGuidEx(&deviceClassNetGUID, machineName)
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className, err := setupapi.SetupDiClassNameFromGuidEx(&deviceClassNetGUID, "")
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if err != nil {
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return nil, false, fmt.Errorf("SetupDiClassNameFromGuidEx(%v) failed: %v", deviceClassNetGUID, err)
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}
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// Create a new device info element and add it to the device info set.
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deviceData, err := devInfoList.CreateDeviceInfo(className, &deviceClassNetGUID, description, hwndParent, setupapi.DICD_GENERATE_ID)
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deviceData, err := devInfoList.CreateDeviceInfo(className, &deviceClassNetGUID, description, 0, setupapi.DICD_GENERATE_ID)
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if err != nil {
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return nil, false, fmt.Errorf("SetupDiCreateDeviceInfo failed: %v", err)
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}
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if hwndParent == 0 {
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err = setQuietInstall(devInfoList, deviceData)
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if err != nil {
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return nil, false, fmt.Errorf("Setting quiet installation failed: %v", err)
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}
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err = setQuietInstall(devInfoList, deviceData)
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if err != nil {
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return nil, false, fmt.Errorf("Setting quiet installation failed: %v", err)
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}
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// Set a device information element as the selected member of a device information set.
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@ -308,10 +282,7 @@ func CreateInterface(description string, requestedGUID *windows.GUID, hwndParent
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err = fmt.Errorf("SetupDiCallClassInstaller(DIF_INSTALLDEVICE) failed: %v", err)
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}
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var wintun *Wintun
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var rebootRequired bool
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var key registry.Key
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if err == nil {
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// Check if a system reboot is required. (Ignore errors)
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if ret, _ := checkReboot(devInfoList, deviceData); ret {
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@ -426,21 +397,11 @@ func CreateInterface(description string, requestedGUID *windows.GUID, hwndParent
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return nil, rebootRequired, err
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}
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//
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// DeleteInterface deletes a TUN interface.
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//
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// hwndParent is a handle to the top-level window to use for any user
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// interface that is related to non-device-specific actions (such as a select-
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// device dialog box that uses the global class driver list). This handle is
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// optional and can be 0. If a specific top-level window is not required, set
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// hwndParent to 0.
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//
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// Function silently succeeds if the interface was not found.
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//
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// Function returns true if a reboot is required.
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//
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func (wintun *Wintun) DeleteInterface(hwndParent uintptr) (bool, error) {
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devInfoList, deviceData, err := wintun.deviceData(hwndParent)
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// DeleteInterface deletes a Wintun interface. This function succeeds
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// if the interface was not found. It returns a bool indicating whether
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// a reboot is required.
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func (wintun *Wintun) DeleteInterface() (rebootRequired bool, err error) {
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devInfoList, deviceData, err := wintun.deviceData()
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if err == windows.ERROR_OBJECT_NOT_FOUND {
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return false, nil
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}
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@ -468,13 +429,11 @@ func (wintun *Wintun) DeleteInterface(hwndParent uintptr) (bool, error) {
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}
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// Check if a system reboot is required. (Ignore errors)
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ret, _ := checkReboot(devInfoList, deviceData)
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return ret, nil
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rebootRequired, _ = checkReboot(devInfoList, deviceData)
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return rebootRequired, nil
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}
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//
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// checkReboot checks device install parameters if a system reboot is required.
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//
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func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) (bool, error) {
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devInstallParams, err := deviceInfoSet.DeviceInstallParams(deviceInfoData)
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if err != nil {
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@ -484,9 +443,7 @@ func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInf
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return (devInstallParams.Flags & (setupapi.DI_NEEDREBOOT | setupapi.DI_NEEDRESTART)) != 0, nil
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}
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//
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// setQuietInstall sets device install parameters for a quiet installation
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//
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func setQuietInstall(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) error {
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devInstallParams, err := deviceInfoSet.DeviceInstallParams(deviceInfoData)
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if err != nil {
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@ -497,9 +454,7 @@ func setQuietInstall(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.De
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return deviceInfoSet.SetDeviceInstallParams(deviceInfoData, devInstallParams)
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}
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//
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// InterfaceName returns network interface name.
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//
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// InterfaceName returns the name of the Wintun interface.
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func (wintun *Wintun) InterfaceName() (string, error) {
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key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.netRegKeyName(), registry.QUERY_VALUE)
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if err != nil {
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@ -511,9 +466,7 @@ func (wintun *Wintun) InterfaceName() (string, error) {
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return registryEx.GetStringValue(key, "Name")
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}
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//
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// SetInterfaceName sets network interface name.
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//
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// SetInterfaceName sets name of the Wintun interface.
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func (wintun *Wintun) SetInterfaceName(ifname string) error {
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// We have to tell the various runtime COM services about the new name too. We ignore the
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// error because netshell isn't available on servercore.
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@ -530,23 +483,17 @@ func (wintun *Wintun) SetInterfaceName(ifname string) error {
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return key.SetStringValue("Name", ifname)
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}
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//
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// netRegKeyName returns interface-specific network registry key name.
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//
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// netRegKeyName returns the interface-specific network registry key name.
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func (wintun *Wintun) netRegKeyName() string {
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return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", deviceClassNetGUID, wintun.cfgInstanceID)
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}
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//
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// tcpipAdapterRegKeyName returns adapter-specific TCP/IP network registry key name.
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//
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// tcpipAdapterRegKeyName returns the adapter-specific TCP/IP network registry key name.
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func (wintun *Wintun) tcpipAdapterRegKeyName() string {
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return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Adapters\\%v", wintun.cfgInstanceID)
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}
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//
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// tcpipInterfaceRegKeyName returns interface-specific TCP/IP network registry key name.
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//
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// tcpipInterfaceRegKeyName returns the interface-specific TCP/IP network registry key name.
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func (wintun *Wintun) tcpipInterfaceRegKeyName() (path string, err error) {
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key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.tcpipAdapterRegKeyName(), registry.QUERY_VALUE)
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if err != nil {
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@ -563,23 +510,16 @@ func (wintun *Wintun) tcpipInterfaceRegKeyName() (path string, err error) {
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return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Services\\%s", paths[0]), nil
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}
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//
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// deviceData returns TUN device info list handle and interface device info
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// data.
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//
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// The device info list handle must be closed after use.
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//
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// In case the device is not found, windows.ERROR_OBJECT_NOT_FOUND is
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// returned.
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//
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func (wintun *Wintun) deviceData(hwndParent uintptr) (setupapi.DevInfo, *setupapi.DevInfoData, error) {
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// data. The device info list handle must be closed after use. In case the
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// device is not found, windows.ERROR_OBJECT_NOT_FOUND is returned.
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func (wintun *Wintun) deviceData() (setupapi.DevInfo, *setupapi.DevInfoData, error) {
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// Create a list of network devices.
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devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, enumerator, hwndParent, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), machineName)
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devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
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if err != nil {
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return 0, nil, fmt.Errorf("SetupDiGetClassDevsEx(%v) failed: %v", deviceClassNetGUID, err.Error())
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}
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// Iterate.
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for index := 0; ; index++ {
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// Get the device from the list. Should anything be wrong with this device, continue with next.
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deviceData, err := devInfoList.EnumDeviceInfo(index)
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@ -598,14 +538,11 @@ func (wintun *Wintun) deviceData(hwndParent uintptr) (setupapi.DevInfo, *setupap
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}
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if wintun.cfgInstanceID == wintun2.cfgInstanceID {
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if hwndParent == 0 {
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err = setQuietInstall(devInfoList, deviceData)
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if err != nil {
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devInfoList.Close()
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return 0, nil, fmt.Errorf("Setting quiet installation failed: %v", err)
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}
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err = setQuietInstall(devInfoList, deviceData)
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if err != nil {
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devInfoList.Close()
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return 0, nil, fmt.Errorf("Setting quiet installation failed: %v", err)
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}
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return devInfoList, deviceData, nil
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}
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}
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@ -614,23 +551,17 @@ func (wintun *Wintun) deviceData(hwndParent uintptr) (setupapi.DevInfo, *setupap
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return 0, nil, windows.ERROR_OBJECT_NOT_FOUND
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}
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//
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// DataFileName returns Wintun device data pipe name.
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//
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// DataFileName returns the Wintun device data pipe name.
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func (wintun *Wintun) DataFileName() string {
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return fmt.Sprintf("\\\\.\\Global\\WINTUN%d", wintun.luidIndex)
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}
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//
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// GUID returns the GUID of the interface.
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//
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func (wintun *Wintun) GUID() windows.GUID {
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return wintun.cfgInstanceID
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}
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//
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// LUID returns the LUID of the interface.
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//
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func (wintun *Wintun) LUID() uint64 {
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return ((uint64(wintun.luidIndex) & ((1 << 24) - 1)) << 24) | ((uint64(wintun.ifType) & ((1 << 16) - 1)) << 48)
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}
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