mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 13:05:46 +00:00
85 lines
2.0 KiB
Go
85 lines
2.0 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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"os"
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"path/filepath"
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"golang.org/x/sys/windows"
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"golang.org/x/sys/windows/registry"
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"tailscale.com/syncs"
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"tailscale.com/util/winutil"
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)
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func init() {
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osVersion = osVersionWindows
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packageType = packageTypeWindows
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}
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var winVerCache syncs.AtomicValue[string]
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func osVersionWindows() string {
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if s, ok := winVerCache.LoadOk(); 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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func packageTypeWindows() string {
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if _, err := os.Stat(`C:\ProgramData\chocolatey\lib\tailscale`); err == nil {
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return "choco"
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}
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if msiSentinel := winutil.GetRegInteger("MSI", 0); msiSentinel == 1 {
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return "msi"
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}
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exe, err := os.Executable()
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if err != nil {
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return ""
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}
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dir := filepath.Dir(exe)
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nsisUninstaller := filepath.Join(dir, "Uninstall-Tailscale.exe")
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_, err = os.Stat(nsisUninstaller)
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if err == nil {
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return "nsis"
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}
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// Atypical. Not worth trying to detect. Likely open
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// source tailscaled or a developer running by hand.
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return ""
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}
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