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wintun: simplify error matching and remove dumb comments

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This commit is contained in:
Jason A. Donenfeld 2019-06-10 11:10:49 +02:00
parent a304f69e0d
commit 700860f8e6
1 changed files with 4 additions and 19 deletions
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23
tun/wintun/wintun_windows.go
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@ -94,23 +94,20 @@ func GetInterface(ifname string) (*Wintun, error) {
ifname = strings.ToLower(ifname)
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)
if err != nil {
if errWin, ok := err.(windows.Errno); ok && errWin == windows.ERROR_NO_MORE_ITEMS {
if err == windows.ERROR_NO_MORE_ITEMS {
break
}
continue
}
// Get interface ID.
wintun, err := makeWintun(devInfoList, deviceData)
if err != nil {
continue
}
// TODO: is there a better way than comparing ifnames?
// Get interface name.
ifname2, err := wintun.InterfaceName()
if err != nil {
continue
@ -126,25 +123,21 @@ func GetInterface(ifname string) (*Wintun, error) {
defer devInfoList.DestroyDriverInfoList(deviceData, driverType)
for index := 0; ; index++ {
// Get a driver from the list.
driverData, err := devInfoList.EnumDriverInfo(deviceData, driverType, index)
if err != nil {
if errWin, ok := err.(windows.Errno); ok && errWin == windows.ERROR_NO_MORE_ITEMS {
if err == windows.ERROR_NO_MORE_ITEMS {
break
}
// Something is wrong with this driver. Skip it.
continue
}
// Get driver info details.
driverDetailData, err := devInfoList.DriverInfoDetail(deviceData, driverData)
if err != nil {
// Something is wrong with this driver. Skip it.
continue
}
if driverDetailData.IsCompatible(hardwareID) {
// Matching hardware ID found.
return wintun, nil
}
}
@ -204,7 +197,6 @@ func CreateInterface(description string, requestedGUID *windows.GUID) (wintun *W
return nil, false, fmt.Errorf("SetupDiSetDeviceRegistryProperty(SPDRP_HARDWAREID) failed: %v", err)
}
// Search for the driver.
const driverType = setupapi.SPDIT_COMPATDRIVER
err = devInfoList.BuildDriverInfoList(deviceData, driverType) // TODO: This takes ~510ms
if err != nil {
@ -215,30 +207,24 @@ func CreateInterface(description string, requestedGUID *windows.GUID) (wintun *W
driverDate := windows.Filetime{}
driverVersion := uint64(0)
for index := 0; ; index++ { // TODO: This loop takes ~600ms
// Get a driver from the list.
driverData, err := devInfoList.EnumDriverInfo(deviceData, driverType, index)
if err != nil {
if errWin, ok := err.(windows.Errno); ok && errWin == windows.ERROR_NO_MORE_ITEMS {
if err == windows.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.DriverInfoDetail(deviceData, driverData)
if err != nil {
// Something is wrong with this driver. Skip it.
continue
}
if driverDetailData.IsCompatible(hardwareID) {
// Matching hardware ID found. Select the driver.
err := devInfoList.SetSelectedDriver(deviceData, driverData)
if err != nil {
// Something is wrong with this driver. Skip it.
continue
}
@ -521,10 +507,9 @@ func (wintun *Wintun) deviceData() (setupapi.DevInfo, *setupapi.DevInfoData, err
}
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)
if err != nil {
if errWin, ok := err.(windows.Errno); ok && errWin == windows.ERROR_NO_MORE_ITEMS {
if err == windows.ERROR_NO_MORE_ITEMS {
break
}
continue