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util/winutil: add GetRegInteger

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This helper allows us to retrieve `DWORD` and `QWORD` values from the Tailscale key in the Windows registry.

Signed-off-by: Aaron Klotz <aaron@tailscale.com>
This commit is contained in:
Aaron Klotz 2021-09-28 16:29:47 -06:00
parent 5809386525
commit 3386a86fe5
2 changed files with 30 additions and 0 deletions
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23
util/winutil/winutil.go
View File

@ -53,6 +53,29 @@ func GetRegString(name, defval string) string {
return val
}
// GetRegInteger looks up a registry path in our local machine path, or returns
// the given default if it can't.
//
// This function will only work on GOOS=windows. Trying to run it on any other
// OS will always return the default value.
func GetRegInteger(name string, defval uint64) uint64 {
key, err := registry.OpenKey(registry.LOCAL_MACHINE, RegBase, registry.READ)
if err != nil {
log.Printf("registry.OpenKey(%v): %v", RegBase, err)
return defval
}
defer key.Close()
val, _, err := key.GetIntegerValue(name)
if err != nil {
if err != registry.ErrNotExist {
log.Printf("registry.GetIntegerValue(%v): %v", name, err)
}
return defval
}
return val
}
var (
kernel32 = syscall.NewLazyDLL("kernel32.dll")
procWTSGetActiveConsoleSessionId = kernel32.NewProc("WTSGetActiveConsoleSessionId")

7
util/winutil/winutil_notwindows.go
View File

@ -15,3 +15,10 @@ const RegBase = ``
// This function will only work on GOOS=windows. Trying to run it on any other
// OS will always return the default value.
func GetRegString(name, defval string) string { return defval }
// GetRegInteger looks up a registry path in our local machine path, or returns
// the given default if it can't.
//
// This function will only work on GOOS=windows. Trying to run it on any other
// OS will always return the default value.
func GetRegInteger(name string, defval uint64) uint64 { return defval }