mirror of
https://github.com/prometheus-community/windows_exporter.git
synced 2026-10-17 10:09:05 +02:00
78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build windows
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package sysinfoapi
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import (
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"fmt"
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"unsafe"
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)
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//nolint:gochecknoglobals
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var procGetSystemFirmwareTable = kernel32.NewProc("GetSystemFirmwareTable")
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// SMBIOS table provider signature ('RSMB').
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const firmwareTableProviderSigRSMB uint32 = 0x52534D42
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// GetSMBIOSSystemInfo retrieves the SMBIOS Type 1 (System Information) data
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// using the GetSystemFirmwareTable Win32 API. No WMI dependency.
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func GetSMBIOSSystemInfo() (*SMBIOSSystemInfo, error) {
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data, err := getSystemFirmwareTable(firmwareTableProviderSigRSMB, 0)
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if err != nil {
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return nil, fmt.Errorf("GetSystemFirmwareTable: %w", err)
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}
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return parseSMBIOSSystemInfo(data)
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}
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// getSystemFirmwareTable wraps the GetSystemFirmwareTable Win32 API.
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// https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getsystemfirmwaretable
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func getSystemFirmwareTable(providerSig, tableID uint32) ([]byte, error) {
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// First call: determine buffer size.
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r1, _, err := procGetSystemFirmwareTable.Call(
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uintptr(providerSig),
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uintptr(tableID),
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0,
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0,
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)
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size := uint32(r1)
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if size == 0 {
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return nil, fmt.Errorf("failed to get firmware table size: %w", err)
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}
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buf := make([]byte, size)
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r1, _, err = procGetSystemFirmwareTable.Call(
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uintptr(providerSig),
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uintptr(tableID),
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uintptr(unsafe.Pointer(&buf[0])),
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uintptr(size),
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)
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written := uint32(r1)
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if written == 0 {
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return nil, fmt.Errorf("failed to get firmware table: %w", err)
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}
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if written > size {
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return nil, fmt.Errorf("firmware table size changed between calls (need %d, have %d)", written, size)
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}
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return buf[:written], nil
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}
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