mirror of
https://github.com/prometheus-community/windows_exporter.git
synced 2026-10-17 18:19:04 +02:00
368 lines
11 KiB
Go
368 lines
11 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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package sysinfoapi
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import (
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"slices"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestFormatUUID(t *testing.T) {
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t.Parallel()
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tests := []struct {
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name string
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raw []byte
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smbios26Plus bool
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expected string
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}{
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{
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name: "SMBIOS 2.6+ UUID with LE byte swap",
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// Stored as: 78 56 34 12 34 12 78 56 12 34 56 78 9a bc de f0
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// Expected: 12345678-1234-5678-1234-56789abcdef0
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raw: []byte{0x78, 0x56, 0x34, 0x12, 0x34, 0x12, 0x78, 0x56, 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0},
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smbios26Plus: true,
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expected: "12345678-1234-5678-1234-56789abcdef0",
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},
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{
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name: "pre-2.6 UUID in network byte order",
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// All fields in big-endian (network) order.
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raw: []byte{0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0},
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smbios26Plus: false,
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expected: "12345678-1234-5678-1234-56789abcdef0",
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},
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{
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name: "all zeros - not settable",
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raw: make([]byte, 16),
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smbios26Plus: true,
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expected: "",
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},
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{
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name: "all 0xFF - not present",
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raw: []byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
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smbios26Plus: true,
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expected: "",
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},
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{
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name: "too short",
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raw: []byte{0x01, 0x02},
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smbios26Plus: true,
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expected: "",
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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t.Parallel()
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assert.Equal(t, tc.expected, formatUUID(tc.raw, tc.smbios26Plus))
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})
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}
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}
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func TestExtractStrings(t *testing.T) {
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t.Parallel()
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data := []byte("QEMU\x00Standard PC\x00v1.0\x00\x00")
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result := extractStrings(data)
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// The trailing double-NUL produces a final empty string entry;
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// the first three entries correspond to the actual firmware strings.
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require.GreaterOrEqual(t, len(result), 3)
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assert.Equal(t, "QEMU", result[0])
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assert.Equal(t, "Standard PC", result[1])
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assert.Equal(t, "v1.0", result[2])
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}
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func TestExtractStringsEmpty(t *testing.T) {
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t.Parallel()
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// Empty strings between NULs must be preserved by position.
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data := []byte("first\x00\x00third\x00\x00")
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result := extractStrings(data)
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require.GreaterOrEqual(t, len(result), 3)
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assert.Equal(t, "first", result[0])
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assert.Empty(t, result[1])
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assert.Equal(t, "third", result[2])
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}
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func TestGetStringByIndex(t *testing.T) {
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t.Parallel()
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strs := []string{"first", "second", "third"}
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assert.Empty(t, getStringByIndex(strs, 0))
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assert.Equal(t, "first", getStringByIndex(strs, 1))
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assert.Equal(t, "second", getStringByIndex(strs, 2))
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assert.Equal(t, "third", getStringByIndex(strs, 3))
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assert.Empty(t, getStringByIndex(strs, 4))
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}
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func TestParseSMBIOSSystemInfo(t *testing.T) {
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t.Parallel()
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// Build a minimal RSMB blob with a Type 1 structure.
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// Header: 8 bytes (rawSMBIOSData).
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header := []byte{
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0x00, // Used20CallingMethod
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0x03, // SMBIOSMajorVersion
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0x02, // SMBIOSMinorVersion
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0x00, // DMARevision
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0x00, 0x00, 0x00, 0x00, // Length (placeholder)
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}
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// Type 1 formatted area: 0x19 bytes
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type1 := make([]byte, 0x19)
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type1[0] = 1 // Type
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type1[1] = 0x19 // Length
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// Handle (2 bytes) - don't care
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type1[4] = 1 // Manufacturer string index
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type1[5] = 2 // Product Name string index
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type1[6] = 3 // Version string index
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type1[7] = 4 // Serial Number string index
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// UUID at offset 0x08: 16 bytes
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// Store 12345678-1234-5678-9abc-def012345678 in SMBIOS LE format
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copy(type1[0x08:], []byte{0x78, 0x56, 0x34, 0x12, 0x34, 0x12, 0x78, 0x56, 0x9a, 0xbc, 0xde, 0xf0, 0x12, 0x34, 0x56, 0x78})
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// Strings area
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strings := []byte("QEMU\x00Standard PC (Q35 + ICH9, 2009)\x00pc-q35-9.2\x00SN-12345\x00\x00")
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// Combine
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tableData := slices.Concat(type1, strings)
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tableLen := len(tableData)
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// Fill in length in header
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header[4] = byte(tableLen)
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header[5] = byte(tableLen >> 8)
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header[6] = byte(tableLen >> 16)
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header[7] = byte(tableLen >> 24)
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data := slices.Concat(header, tableData)
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info, err := parseSMBIOSSystemInfo(data)
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require.NoError(t, err)
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assert.Equal(t, "QEMU", info.Manufacturer)
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assert.Equal(t, "Standard PC (Q35 + ICH9, 2009)", info.ProductName)
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assert.Equal(t, "pc-q35-9.2", info.Version)
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assert.Equal(t, "SN-12345", info.SerialNumber)
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assert.Equal(t, "12345678-1234-5678-9abc-def012345678", info.UUID)
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}
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func TestParseSMBIOSSystemInfoPre26(t *testing.T) {
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t.Parallel()
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// SMBIOS 2.5 header: UUID bytes in network (big-endian) order.
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header := []byte{
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0x00, // Used20CallingMethod
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0x02, // SMBIOSMajorVersion = 2
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0x05, // SMBIOSMinorVersion = 5 (pre-2.6)
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0x00, // DMARevision
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0x00, 0x00, 0x00, 0x00, // Length (placeholder)
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}
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type1 := make([]byte, 0x19)
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type1[0] = 1 // Type
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type1[1] = 0x19 // Length
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type1[4] = 1 // Manufacturer string index
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type1[5] = 2 // Product Name string index
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type1[6] = 3 // Version string index
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type1[7] = 4 // Serial Number string index
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// UUID in network byte order: 12345678-1234-5678-9abc-def012345678
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copy(type1[0x08:], []byte{0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0, 0x12, 0x34, 0x56, 0x78})
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strs := []byte("QEMU\x00Standard PC\x00v1.0\x00SN-001\x00\x00")
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tableData := slices.Concat(type1, strs)
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tableLen := len(tableData)
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header[4] = byte(tableLen)
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header[5] = byte(tableLen >> 8)
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header[6] = byte(tableLen >> 16)
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header[7] = byte(tableLen >> 24)
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data := slices.Concat(header, tableData)
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info, err := parseSMBIOSSystemInfo(data)
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require.NoError(t, err)
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assert.Equal(t, "12345678-1234-5678-9abc-def012345678", info.UUID)
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assert.Equal(t, "QEMU", info.Manufacturer)
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}
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func TestParseSMBIOSSystemInfoSMBIOS20(t *testing.T) {
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t.Parallel()
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// SMBIOS 2.0 Type 1 structure: only 8 bytes (no UUID field).
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header := []byte{
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0x00, // Used20CallingMethod
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0x02, // SMBIOSMajorVersion = 2
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0x00, // SMBIOSMinorVersion = 0
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0x00, // DMARevision
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0x00, 0x00, 0x00, 0x00, // Length (placeholder)
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}
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type1 := make([]byte, 0x08)
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type1[0] = 1 // Type
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type1[1] = 0x08 // Length (8 bytes, no UUID)
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type1[4] = 1 // Manufacturer string index
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type1[5] = 2 // Product Name string index
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type1[6] = 3 // Version string index
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type1[7] = 4 // Serial Number string index
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strs := []byte("OldBIOS\x00Legacy PC\x00v0.1\x00SN-OLD\x00\x00")
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tableData := slices.Concat(type1, strs)
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tableLen := len(tableData)
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header[4] = byte(tableLen)
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header[5] = byte(tableLen >> 8)
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header[6] = byte(tableLen >> 16)
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header[7] = byte(tableLen >> 24)
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data := slices.Concat(header, tableData)
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info, err := parseSMBIOSSystemInfo(data)
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require.NoError(t, err)
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assert.Equal(t, "OldBIOS", info.Manufacturer)
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assert.Equal(t, "Legacy PC", info.ProductName)
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assert.Equal(t, "v0.1", info.Version)
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assert.Equal(t, "SN-OLD", info.SerialNumber)
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assert.Empty(t, info.UUID, "UUID should be empty for 8-byte SMBIOS 2.0 Type 1 structures")
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}
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func TestParseSMBIOSSystemInfoWithType0Preceding(t *testing.T) {
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t.Parallel()
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// Real firmware tables almost always have Type 0 (BIOS Information) before Type 1.
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// Verify the walker correctly skips Type 0 and finds Type 1.
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header := []byte{
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0x00, // Used20CallingMethod
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0x03, // SMBIOSMajorVersion
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0x02, // SMBIOSMinorVersion
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0x00, // DMARevision
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0x00, 0x00, 0x00, 0x00, // Length (placeholder)
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}
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// Type 0 (BIOS Information): 0x12 bytes formatted area.
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type0 := make([]byte, 0x12)
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type0[0] = 0 // Type 0
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type0[1] = 0x12 // Length
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type0[4] = 1 // Vendor string index
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type0[5] = 2 // BIOS Version string index
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type0Strs := []byte("BIOS Vendor\x00BIOS v1.0\x00\x00")
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// Type 1 (System Information): 0x19 bytes formatted area.
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type1 := make([]byte, 0x19)
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type1[0] = 1 // Type 1
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type1[1] = 0x19 // Length
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type1[4] = 1 // Manufacturer string index
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type1[5] = 2 // Product Name string index
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type1[6] = 3 // Version string index
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type1[7] = 4 // Serial Number string index
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copy(type1[0x08:], []byte{0x78, 0x56, 0x34, 0x12, 0x34, 0x12, 0x78, 0x56, 0x9a, 0xbc, 0xde, 0xf0, 0x12, 0x34, 0x56, 0x78})
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type1Strs := []byte("Dell Inc.\x00PowerEdge R740\x00v2.0\x00SN-ABCDE\x00\x00")
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tableData := slices.Concat(type0, type0Strs, type1, type1Strs)
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tableLen := len(tableData)
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header[4] = byte(tableLen)
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header[5] = byte(tableLen >> 8)
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header[6] = byte(tableLen >> 16)
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header[7] = byte(tableLen >> 24)
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data := slices.Concat(header, tableData)
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info, err := parseSMBIOSSystemInfo(data)
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require.NoError(t, err)
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assert.Equal(t, "Dell Inc.", info.Manufacturer)
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assert.Equal(t, "PowerEdge R740", info.ProductName)
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assert.Equal(t, "v2.0", info.Version)
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assert.Equal(t, "SN-ABCDE", info.SerialNumber)
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assert.Equal(t, "12345678-1234-5678-9abc-def012345678", info.UUID)
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}
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func TestParseSMBIOSSystemInfoUnterminatedStrings(t *testing.T) {
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t.Parallel()
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// Build a Type 1 structure whose string area lacks the double-NUL terminator.
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header := []byte{
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0x00, // Used20CallingMethod
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0x03, // SMBIOSMajorVersion
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0x02, // SMBIOSMinorVersion
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0x00, // DMARevision
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0x00, 0x00, 0x00, 0x00, // Length (placeholder)
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}
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type1 := make([]byte, 0x19)
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type1[0] = 1 // Type
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type1[1] = 0x19 // Length
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type1[4] = 1 // Manufacturer string index
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// String area with only a single NUL (missing the terminating double-NUL).
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strs := []byte("QEMU\x00")
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tableData := slices.Concat(type1, strs)
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tableLen := len(tableData)
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header[4] = byte(tableLen)
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header[5] = byte(tableLen >> 8)
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header[6] = byte(tableLen >> 16)
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header[7] = byte(tableLen >> 24)
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data := slices.Concat(header, tableData)
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_, err := parseSMBIOSSystemInfo(data)
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require.Error(t, err)
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assert.Contains(t, err.Error(), "not properly terminated")
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}
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func FuzzParseSMBIOSSystemInfo(f *testing.F) {
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// Seed with a valid RSMB blob.
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header := []byte{
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0x00, 0x03, 0x02, 0x00,
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0x00, 0x00, 0x00, 0x00,
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}
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type1 := make([]byte, 0x19)
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type1[0] = 1
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type1[1] = 0x19
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type1[4] = 1
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type1[5] = 2
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type1[6] = 3
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type1[7] = 4
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copy(type1[0x08:], []byte{0x78, 0x56, 0x34, 0x12, 0x34, 0x12, 0x78, 0x56, 0x9a, 0xbc, 0xde, 0xf0, 0x12, 0x34, 0x56, 0x78})
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strs := []byte("QEMU\x00Standard PC\x00v1.0\x00SN-001\x00\x00")
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tableData := slices.Concat(type1, strs)
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tableLen := len(tableData)
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header[4] = byte(tableLen)
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header[5] = byte(tableLen >> 8)
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header[6] = byte(tableLen >> 16)
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header[7] = byte(tableLen >> 24)
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f.Add(slices.Concat(header, tableData))
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// Also seed with an empty input and a truncated one.
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f.Add([]byte{})
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f.Add(header[:4])
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f.Fuzz(func(t *testing.T, data []byte) {
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// Must not panic on any input.
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_, _ = parseSMBIOSSystemInfo(data)
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})
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}
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