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7d8feb2784
We replace the cmd.exe invocation with RtlGetNtVersionNumbers for the first three fields. On Windows 10+, we query for the fourth field which is available via the registry. The fourth field is not really documented anywhere; Firefox has been querying it successfully since Windows 10 was released, so we can be pretty confident in its longevity at this point. Fixes https://github.com/tailscale/tailscale/issues/1478 Signed-off-by: Aaron Klotz <aaron@tailscale.com>
59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package hostinfo
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import (
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"fmt"
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"sync/atomic"
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"golang.org/x/sys/windows"
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"golang.org/x/sys/windows/registry"
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)
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func init() {
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osVersion = osVersionWindows
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}
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var winVerCache atomic.Value // of string
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func osVersionWindows() string {
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if s, ok := winVerCache.Load().(string); ok {
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return s
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}
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major, minor, build := windows.RtlGetNtVersionNumbers()
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s := fmt.Sprintf("%d.%d.%d", major, minor, build)
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// Windows 11 still uses 10 as its major number internally
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if major == 10 {
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if ubr, err := getUBR(); err == nil {
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s += fmt.Sprintf(".%d", ubr)
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}
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}
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if s != "" {
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winVerCache.Store(s)
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}
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return s // "10.0.19041.388", ideally
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}
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// getUBR obtains a fourth version field, the "Update Build Revision",
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// from the registry. This field is only available beginning with Windows 10.
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func getUBR() (uint32, error) {
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key, err := registry.OpenKey(registry.LOCAL_MACHINE,
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`SOFTWARE\Microsoft\Windows NT\CurrentVersion`, registry.QUERY_VALUE|registry.WOW64_64KEY)
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if err != nil {
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return 0, err
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}
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defer key.Close()
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val, valType, err := key.GetIntegerValue("UBR")
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if err != nil {
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return 0, err
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}
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if valType != registry.DWORD {
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return 0, registry.ErrUnexpectedType
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}
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return uint32(val), nil
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}
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