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39 lines
1.0 KiB
Go
39 lines
1.0 KiB
Go
// +build windows
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package xid
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import (
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"fmt"
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"syscall"
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"unsafe"
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)
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func readPlatformMachineID() (string, error) {
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// source: https://github.com/shirou/gopsutil/blob/master/host/host_syscall.go
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var h syscall.Handle
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err := syscall.RegOpenKeyEx(syscall.HKEY_LOCAL_MACHINE, syscall.StringToUTF16Ptr(`SOFTWARE\Microsoft\Cryptography`), 0, syscall.KEY_READ|syscall.KEY_WOW64_64KEY, &h)
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if err != nil {
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return "", err
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}
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defer syscall.RegCloseKey(h)
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const syscallRegBufLen = 74 // len(`{`) + len(`abcdefgh-1234-456789012-123345456671` * 2) + len(`}`) // 2 == bytes/UTF16
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const uuidLen = 36
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var regBuf [syscallRegBufLen]uint16
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bufLen := uint32(syscallRegBufLen)
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var valType uint32
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err = syscall.RegQueryValueEx(h, syscall.StringToUTF16Ptr(`MachineGuid`), nil, &valType, (*byte)(unsafe.Pointer(®Buf[0])), &bufLen)
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if err != nil {
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return "", err
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}
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hostID := syscall.UTF16ToString(regBuf[:])
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hostIDLen := len(hostID)
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if hostIDLen != uuidLen {
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return "", fmt.Errorf("HostID incorrect: %q\n", hostID)
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}
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return hostID, nil
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}
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