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wintun: merge opening device registry key

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This also introduces waiting for key to appear on initial access.

See if this resolves the issue caused by HDD power-up delay resulting in
failure to create the adapter.

Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-08-02 15:48:41 +02:00
parent f5e54932e6
commit 1ff37e2b07
1 changed files with 15 additions and 21 deletions
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32
tun/wintun/wintun_windows.go
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@ -262,14 +262,23 @@ func CreateInterface(description string, requestedGUID *windows.GUID) (wintun *W
devInfoList.CallClassInstaller(setupapi.DIF_REGISTER_COINSTALLERS, deviceData)
var key registry.Key
if requestedGUID != nil {
key, err = devInfoList.OpenDevRegKey(deviceData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.SET_VALUE)
const pollTimeout = time.Millisecond * 50
for i := 0; i < int(waitForRegistryTimeout/pollTimeout); i++ {
if i != 0 {
time.Sleep(pollTimeout)
}
key, err = devInfoList.OpenDevRegKey(deviceData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.SET_VALUE|registry.QUERY_VALUE|registry.NOTIFY)
if err == nil {
break
}
}
if err != nil {
err = fmt.Errorf("OpenDevRegKey failed: %v", err)
err = fmt.Errorf("SetupDiOpenDevRegKey failed: %v", err)
return
}
defer key.Close()
if requestedGUID != nil {
err = key.SetStringValue("NetSetupAnticipatedInstanceId", requestedGUID.String())
key.Close()
if err != nil {
err = fmt.Errorf("SetStringValue(NetSetupAnticipatedInstanceId) failed: %v", err)
return
@ -309,21 +318,6 @@ func CreateInterface(description string, requestedGUID *windows.GUID) (wintun *W
// DIF_INSTALLDEVICE returns almost immediately, while the device installation
// continues in the background. It might take a while, before all registry
// keys and values are populated.
const pollTimeout = time.Millisecond * 50
for i := 0; i < int(waitForRegistryTimeout/pollTimeout); i++ {
if i != 0 {
time.Sleep(pollTimeout)
}
key, err = devInfoList.OpenDevRegKey(deviceData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.QUERY_VALUE|registry.NOTIFY)
if err == nil {
break
}
}
if err != nil {
err = fmt.Errorf("SetupDiOpenDevRegKey failed: %v", err)
return
}
defer key.Close()
_, err = registryEx.GetStringValueWait(key, "NetCfgInstanceId", waitForRegistryTimeout)
if err != nil {
err = fmt.Errorf("GetStringValueWait(NetCfgInstanceId) failed: %v", err)