gtsocial-umbx

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hostid_windows.go (1047B)

      1 // +build windows
      2 
      3 package xid
      4 
      5 import (
      6 	"fmt"
      7 	"syscall"
      8 	"unsafe"
      9 )
     10 
     11 func readPlatformMachineID() (string, error) {
     12 	// source: https://github.com/shirou/gopsutil/blob/master/host/host_syscall.go
     13 	var h syscall.Handle
     14 	err := syscall.RegOpenKeyEx(syscall.HKEY_LOCAL_MACHINE, syscall.StringToUTF16Ptr(`SOFTWARE\Microsoft\Cryptography`), 0, syscall.KEY_READ|syscall.KEY_WOW64_64KEY, &h)
     15 	if err != nil {
     16 		return "", err
     17 	}
     18 	defer syscall.RegCloseKey(h)
     19 
     20 	const syscallRegBufLen = 74 // len(`{`) + len(`abcdefgh-1234-456789012-123345456671` * 2) + len(`}`) // 2 == bytes/UTF16
     21 	const uuidLen = 36
     22 
     23 	var regBuf [syscallRegBufLen]uint16
     24 	bufLen := uint32(syscallRegBufLen)
     25 	var valType uint32
     26 	err = syscall.RegQueryValueEx(h, syscall.StringToUTF16Ptr(`MachineGuid`), nil, &valType, (*byte)(unsafe.Pointer(&regBuf[0])), &bufLen)
     27 	if err != nil {
     28 		return "", err
     29 	}
     30 
     31 	hostID := syscall.UTF16ToString(regBuf[:])
     32 	hostIDLen := len(hostID)
     33 	if hostIDLen != uuidLen {
     34 		return "", fmt.Errorf("HostID incorrect: %q\n", hostID)
     35 	}
     36 
     37 	return hostID, nil
     38 }