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Simplify reading NetCfgInstanceId from registry

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As querying non-existing registry value and reading non-existing
registry string value both return ERROR_FILE_NOT_FOUND, we can
use later only.

Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-03-04 13:25:18 +01:00 committed by Jason A. Donenfeld
parent cddfd9a0d8
commit 9041d38e2d
1 changed files with 2 additions and 8 deletions
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10
tun/wintun/wintun_windows.go
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@ -386,8 +386,8 @@ func getInterfaceId(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.Dev
defer key.Close()
for {
// Query the NetCfgInstanceId value. Using get_reg_string() right on might clutter the output with error messages while the registry is still being populated.
_, _, err = key.GetValue("NetCfgInstanceId", nil)
// Read the NetCfgInstanceId value.
value, err := getRegStringValue(key, "NetCfgInstanceId")
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_FILE_NOT_FOUND {
numAttempts--
@ -399,12 +399,6 @@ func getInterfaceId(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.Dev
}
}
return nil, errors.New("RegQueryValueEx(\"NetCfgInstanceId\") failed: " + err.Error())
}
// Read the NetCfgInstanceId value now.
value, err := getRegStringValue(key, "NetCfgInstanceId")
if err != nil {
return nil, errors.New("RegQueryStringValue(\"NetCfgInstanceId\") failed: " + err.Error())
}