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// Copyright 2017-2018 DigitalOcean.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package smbios
import (
"bytes"
"encoding/hex"
"io/ioutil"
"testing"
)
// makeRawSMBIOSData creates a buffer with a valid RawSMBIOSData struct with the
// given version and stream information.
func makeRawSMBIOSData(major, minor, revision byte, stream []byte) []byte {
buffer := make([]byte, rawSMBIOSDataHeaderSize+len(stream))
buffer[0] = 0
buffer[1] = major
buffer[2] = minor
buffer[3] = revision
nativeEndian().PutUint32(buffer[4:8], uint32(len(stream)))
copy(buffer[8:], stream)
return buffer
}
func Test_windowsStream(t *testing.T) {
const major = byte(2)
const minor = byte(4)
const revision = byte(1)
// Note: buffer will be automatically created from the stream if it is not
// explicitly set to a non-nil value. This prevents having to duplicate the
// stream data in the struct definitions below for large test cases.
//
// Unlike in Test_memoryStream, we're not worrying about the actual decoding
// of the structures here. All we care about is whether or not windowsStream
// gives us back the stream data we expect. Whether or not that is valid can
// be tested separately.
tests := []struct {
name string
buffer []byte
stream []byte
ok bool
}{
{
name: "empty buffer",
buffer: []byte{}, // purposefully not nil
},
{
name: "short buffer",
buffer: []byte{0, 1, 2, 3, 4, 5, 6}, // only 7 bytes
},
{
name: "valid header, empty table",
stream: nil,
ok: true,
},
{
name: "length too large",
buffer: func() []byte {
buf := []byte{
0, 2, 4, 1, // version
0, 0, 0, 0, // length placeholder
1, 2, 3, 4, // stream
}
nativeEndian().PutUint32(buf[4:8], 5)
return buf
}(),
},
{
name: "valid header and stream",
stream: []byte{
0x00, 0x05, 0x01, 0x00,
0xff,
0x00,
0x00,
0x01, 0x0c, 0x02, 0x00,
0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef,
'd', 'e', 'a', 'd', 'b', 'e', 'e', 'f', 0x00,
0x00,
127, 0x06, 0x03, 0x00,
0x01, 0x02,
'a', 'b', 'c', 'd', 0x00,
'1', '2', '3', '4', 0x00,
0x00,
},
ok: true,
},
{
name: "buffer larger than needed",
buffer: func() []byte {
buf := makeRawSMBIOSData(major, minor, revision, []byte{1, 2, 3, 4})
buf = append(buf, 5, 6, 7, 8)
return buf
}(),
stream: []byte{1, 2, 3, 4},
ok: true,
},
}
for _, tt := range tests {
// Make buffer if not set explicitly
if tt.buffer == nil {
tt.buffer = makeRawSMBIOSData(major, minor, revision, tt.stream)
}
t.Run(tt.name, func(t *testing.T) {
rc, ep, err := windowsStream(tt.buffer)
if tt.ok && err != nil {
t.Fatalf("unexpected error: %v", err)
}
if !tt.ok && err == nil {
t.Fatalf("expected an error, but none occurred: %v", err)
}
if !tt.ok {
// Don't bother doing comparison if entry point is invalid
t.Logf("OK error: %v", err)
return
}
defer rc.Close()
_, streamSize := ep.Table()
if streamSize != len(tt.stream) {
t.Fatalf("bad stream size: got %d, wanted %d", streamSize, len(tt.stream))
}
maj, min, rev := ep.Version()
if maj != int(major) {
t.Fatalf("bad major version: got %d, wanted %d", maj, major)
}
if min != int(minor) {
t.Fatalf("bad minor version: got %d, wanted %d", min, minor)
}
if rev != int(revision) {
t.Fatalf("bad revision: got %d, wanted %d", rev, revision)
}
streamData, err := ioutil.ReadAll(rc)
if err != nil {
t.Fatalf("failed to read stream: %v", err)
}
if len(streamData) != len(tt.stream) {
t.Fatalf("bad stream data: got %d bytes, wanted %d", len(streamData), len(tt.stream))
}
if bytes.Compare(tt.stream, streamData) != 0 {
t.Fatalf(
"stream data different:\nwant: %s\ngot : %s",
hex.EncodeToString(tt.stream),
hex.EncodeToString(streamData),
)
}
})
}
}
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