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tun_windows: Style

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This commit is contained in:
Jason A. Donenfeld 2019-02-07 04:08:05 +01:00
parent 3b7a4fa3ef
commit 306d08e692
1 changed files with 13 additions and 11 deletions
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24
tun/tun_windows.go
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@ -38,14 +38,14 @@ var deviceClassNetGUID = windows.GUID{0x4d36e972, 0xe325, 0x11ce, [8]byte{0xbf,
const TUN_HWID = "Wintun" const TUN_HWID = "Wintun"
type TunPacket struct { type tunPacket struct {
size uint32 size uint32
data [TUN_MAX_PACKET_SIZE]byte data [TUN_MAX_PACKET_SIZE]byte
} }
type TunRWQueue struct { type tunRWQueue struct {
numPackets uint32 numPackets uint32
packets [TUN_MAX_PACKET_EXCHANGE]TunPacket packets [TUN_MAX_PACKET_EXCHANGE]tunPacket
left uint32 left uint32
} }
@ -54,8 +54,8 @@ type nativeTun struct {
tunName string tunName string
signalName *uint16 signalName *uint16
tunFile *os.File tunFile *os.File
wrBuff TunRWQueue wrBuff tunRWQueue
rdBuff TunRWQueue rdBuff tunRWQueue
signals [TUN_SIGNAL_MAX]windows.Handle signals [TUN_SIGNAL_MAX]windows.Handle
rdNextPacket uint32 rdNextPacket uint32
events chan TUNEvent events chan TUNEvent
@ -67,7 +67,7 @@ func CreateTUN(ifname string) (TUNDevice, error) {
ifid, err := getInterface(ifname, 0) ifid, err := getInterface(ifname, 0)
if ifid == nil || err != nil { if ifid == nil || err != nil {
// Interface does not exist or an error occured. Create one. // Interface does not exist or an error occured. Create one.
ifid, _, err = createInterface("", 0) ifid, _, err = createInterface("WireGuard Tunnel Adapter", 0)
if err != nil { if err != nil {
return nil, err return nil, err
} }
@ -264,6 +264,8 @@ func (tun *nativeTun) Read(buff []byte, offset int) (int, error) {
} }
} }
// Note: flush() and putTunPacket() assume the caller comes only from a single thread; there's no locking.
func (tun *nativeTun) flush() error { func (tun *nativeTun) flush() error {
// Flush write buffer. // Flush write buffer.
data := (*[TUN_EXCHANGE_BUFFER_SIZE]byte)(unsafe.Pointer(&tun.wrBuff)) data := (*[TUN_EXCHANGE_BUFFER_SIZE]byte)(unsafe.Pointer(&tun.wrBuff))
@ -307,7 +309,6 @@ func (tun *nativeTun) putTunPacket(buff []byte) error {
} }
func (tun *nativeTun) Write(buff []byte, offset int) (int, error) { func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
err := tun.putTunPacket(buff[offset:]) err := tun.putTunPacket(buff[offset:])
if err != nil { if err != nil {
return 0, err return 0, err
@ -344,6 +345,7 @@ func getInterface(ifname string, hwndParent uintptr) (*windows.GUID, error) {
return nil, err return nil, err
} }
// TODO: If we're certain we want case-insensitive name comparison, please document the rationale.
ifname = strings.ToLower(ifname) ifname = strings.ToLower(ifname)
// Iterate. // Iterate.
@ -615,8 +617,8 @@ func deleteInterface(ifid *windows.GUID, hwndParent uintptr) (bool, bool, error)
/// ///
/// checkReboot checks device install parameters if a system reboot is required. /// checkReboot checks device install parameters if a system reboot is required.
/// ///
func checkReboot(DeviceInfoSet setupapi.DevInfo, DeviceInfoData *setupapi.SP_DEVINFO_DATA) (bool, error) { func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.SP_DEVINFO_DATA) (bool, error) {
devInstallParams, err := DeviceInfoSet.GetDeviceInstallParams(DeviceInfoData) devInstallParams, err := deviceInfoSet.GetDeviceInstallParams(deviceInfoData)
if err != nil { if err != nil {
return false, err return false, err
} }
@ -637,13 +639,13 @@ func checkReboot(DeviceInfoSet setupapi.DevInfo, DeviceInfoData *setupapi.SP_DEV
// //
// Function returns the network interface ID. // Function returns the network interface ID.
// //
func getInterfaceId(DeviceInfoSet setupapi.DevInfo, DeviceInfoData *setupapi.SP_DEVINFO_DATA, numAttempts int) (*windows.GUID, error) { func getInterfaceId(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.SP_DEVINFO_DATA, numAttempts int) (*windows.GUID, error) {
if numAttempts < 1 { if numAttempts < 1 {
return nil, fmt.Errorf("Invalid numAttempts (expected: >=1, provided: %v)", numAttempts) return nil, fmt.Errorf("Invalid numAttempts (expected: >=1, provided: %v)", numAttempts)
} }
// Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\<class>\<id> registry key. // 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) key, err := deviceInfoSet.OpenDevRegKey(deviceInfoData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.READ)
if err != nil { if err != nil {
return nil, errors.New("Device-specific registry key open failed: " + err.Error()) return nil, errors.New("Device-specific registry key open failed: " + err.Error())
} }