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wintun: Resolve some of golint warnings

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-03-04 14:27:16 +01:00 committed by Jason A. Donenfeld
parent a1aabb21ae
commit 1fdf7b19a3
4 changed files with 33 additions and 17 deletions
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7
tun/tun_windows.go
View file

@ -52,6 +52,10 @@ func packetAlign(size uint32) uint32 {
return (size + (packetExchangeAlignment - 1)) &^ (packetExchangeAlignment - 1)
}
//
// CreateTUN creates a Wintun adapter with the given name. Should a Wintun
// adapter with the same name exist, it is reused.
//
func CreateTUN(ifname string) (TUNDevice, error) {
// Does an interface with this name already exist?
wt, err := wintun.GetInterface(ifname, 0)
@ -351,6 +355,9 @@ func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
return len(buff) - offset, tun.flush()
}
//
// GUID returns Windows adapter instance ID.
//
func (tun *NativeTun) GUID() windows.GUID {
return *(*windows.GUID)(tun.wt)
}

8
tun/wintun/setupapi/setupapi_windows.go
View file

@ -398,10 +398,10 @@ func SetupDiClassNameFromGuidEx(classGUID *windows.GUID, machineName string) (cl
//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) {
func SetupDiClassGuidsFromNameEx(className string, machineName string) ([]windows.GUID, error) {
classNameUTF16, err := syscall.UTF16PtrFromString(className)
if err != nil {
return
return nil, err
}
const bufCapacity = 4
@ -412,7 +412,7 @@ func SetupDiClassGuidsFromNameEx(className string, machineName string) (classGui
if machineName != "" {
machineNameUTF16, err = syscall.UTF16PtrFromString(machineName)
if err != nil {
return
return nil, err
}
}
@ -431,7 +431,7 @@ func SetupDiClassGuidsFromNameEx(className string, machineName string) (classGui
}
}
return
return nil, err
}
//sys setupDiGetSelectedDevice(deviceInfoSet DevInfo, deviceInfoData *DevInfoData) (err error) = setupapi.SetupDiGetSelectedDevice

4
tun/wintun/setupapi/setupapi_windows_test.go
View file

@ -10,11 +10,11 @@ import (
"syscall"
"testing"
"golang.zx2c4.com/wireguard/tun/wintun/guid"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wireguard/tun/wintun/guid"
)
var deviceClassNetGUID = windows.GUID{0x4d36e972, 0xe325, 0x11ce, [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
var deviceClassNetGUID = windows.GUID{Data1: 0x4d36e972, Data2: 0xe325, Data3: 0x11ce, Data4: [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
var computerName string
func init() {

31
tun/wintun/wintun_windows.go
View file

@ -19,11 +19,14 @@ import (
"golang.zx2c4.com/wireguard/tun/wintun/setupapi"
)
//
// Wintun is a handle of a Wintun adapter
//
type Wintun windows.GUID
var deviceClassNetGUID = windows.GUID{0x4d36e972, 0xe325, 0x11ce, [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
var deviceClassNetGUID = windows.GUID{Data1: 0x4d36e972, Data2: 0xe325, Data3: 0x11ce, Data4: [8]byte{0xbf, 0xc1, 0x08, 0x00, 0x2b, 0xe1, 0x03, 0x18}}
const TUN_HWID = "Wintun"
const hardwareID = "Wintun"
//
// GetInterface finds interface ID by name.
@ -66,7 +69,7 @@ func GetInterface(ifname string, hwndParent uintptr) (*Wintun, error) {
}
// Get interface ID.
ifid, err := getInterfaceId(devInfoList, deviceData, 1)
ifid, err := getInterfaceID(devInfoList, deviceData, 1)
if err != nil {
// Something is wrong with this device. Skip it.
continue
@ -106,7 +109,7 @@ func GetInterface(ifname string, hwndParent uintptr) (*Wintun, error) {
continue
}
if driverDetailData.IsCompatible(TUN_HWID) {
if driverDetailData.IsCompatible(hardwareID) {
// Matching hardware ID found.
return (*Wintun)(ifid), nil
}
@ -160,7 +163,7 @@ func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, err
}
// Set Plug&Play device hardware ID property.
hwid, err := syscall.UTF16FromString(TUN_HWID)
hwid, err := syscall.UTF16FromString(hardwareID)
if err != nil {
return nil, false, err
}
@ -199,7 +202,7 @@ func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, err
continue
}
if driverDetailData.IsCompatible(TUN_HWID) {
if driverDetailData.IsCompatible(hardwareID) {
// Matching hardware ID found. Select the driver.
err := devInfoList.SetSelectedDriver(deviceData, driverData)
if err != nil {
@ -214,7 +217,7 @@ func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, err
}
if driverVersion == 0 {
return nil, false, fmt.Errorf("No driver for device \"%v\" installed", TUN_HWID)
return nil, false, fmt.Errorf("No driver for device \"%v\" installed", hardwareID)
}
// Call appropriate class installer.
@ -241,7 +244,7 @@ func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, err
}
// Get network interface ID from registry. Retry for max 30sec.
ifid, err = getInterfaceId(devInfoList, deviceData, 30)
ifid, err = getInterfaceID(devInfoList, deviceData, 30)
}
if err == nil {
@ -302,7 +305,7 @@ func (wintun *Wintun) DeleteInterface(hwndParent uintptr) (bool, bool, error) {
}
// Get interface ID.
ifid2, err := getInterfaceId(devInfoList, deviceData, 1)
ifid2, err := getInterfaceID(devInfoList, deviceData, 1)
if err != nil {
// Something is wrong with this device. Skip it.
continue
@ -364,7 +367,7 @@ func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInf
return false, nil
}
// getInterfaceId returns network interface ID.
// 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
@ -373,7 +376,7 @@ func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInf
//
// Function returns the network interface ID.
//
func getInterfaceId(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData, numAttempts int) (*windows.GUID, error) {
func getInterfaceID(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData, numAttempts int) (*windows.GUID, error) {
if numAttempts < 1 {
return nil, fmt.Errorf("Invalid numAttempts (expected: >=1, provided: %v)", numAttempts)
}
@ -481,10 +484,16 @@ func getRegStringValue(key registry.Key, name string) (string, error) {
return valueExp, nil
}
//
// SignalEventName returns Wintun device data-ready event name.
//
func (wintun *Wintun) SignalEventName() string {
return fmt.Sprintf("Global\\WINTUN_EVENT_%s", guid.ToString((*windows.GUID)(wintun)))
}
//
// DataFileName returns Wintun device data pipe name.
//
func (wintun *Wintun) DataFileName() string {
return fmt.Sprintf("\\\\.\\Global\\WINTUN_DEVICE_%s", guid.ToString((*windows.GUID)(wintun)))
}