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attribute_test.go
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package netlink
import (
"bytes"
"encoding/binary"
"errors"
"math"
"reflect"
"testing"
"unsafe"
"github.com/google/go-cmp/cmp"
"github.com/mdlayher/netlink/nlenc"
)
func TestMarshalAttributes(t *testing.T) {
skipBigEndian(t)
tests := []struct {
name string
attrs []Attribute
b []byte
err error
}{
{
name: "one attribute, short length",
attrs: []Attribute{{
Length: 3,
Type: 1,
}},
err: errInvalidAttribute,
},
{
name: "one attribute, no data",
attrs: []Attribute{{
Length: 4,
Type: 1,
Data: make([]byte, 0),
}},
b: []byte{
0x04, 0x00,
0x01, 0x00,
},
},
{
name: "one attribute, no data, length calculated",
attrs: []Attribute{{
Type: 1,
Data: make([]byte, 0),
}},
b: []byte{
0x04, 0x00,
0x01, 0x00,
},
},
{
name: "one attribute, padded",
attrs: []Attribute{{
Length: 5,
Type: 1,
Data: []byte{0xff},
}},
b: []byte{
0x05, 0x00,
0x01, 0x00,
0xff, 0x00, 0x00, 0x00,
},
},
{
name: "one attribute, padded, length calculated",
attrs: []Attribute{{
Type: 1,
Data: []byte{0xff},
}},
b: []byte{
0x05, 0x00,
0x01, 0x00,
0xff, 0x00, 0x00, 0x00,
},
},
{
name: "one attribute, aligned",
attrs: []Attribute{{
Length: 8,
Type: 2,
Data: []byte{0xaa, 0xbb, 0xcc, 0xdd},
}},
b: []byte{
0x08, 0x00,
0x02, 0x00,
0xaa, 0xbb, 0xcc, 0xdd,
},
},
{
name: "one attribute, aligned, length calculated",
attrs: []Attribute{{
Type: 2,
Data: []byte{0xaa, 0xbb, 0xcc, 0xdd},
}},
b: []byte{
0x08, 0x00,
0x02, 0x00,
0xaa, 0xbb, 0xcc, 0xdd,
},
},
{
name: "multiple attributes",
attrs: []Attribute{
{
Length: 5,
Type: 1,
Data: []byte{0xff},
},
{
Length: 8,
Type: 2,
Data: []byte{0xaa, 0xbb, 0xcc, 0xdd},
},
{
Length: 4,
Type: 3,
Data: make([]byte, 0),
},
{
Length: 16,
Type: 4,
Data: []byte{
0x11, 0x11, 0x11, 0x11,
0x22, 0x22, 0x22, 0x22,
0x33, 0x33, 0x33, 0x33,
},
},
},
b: []byte{
// 1
0x05, 0x00,
0x01, 0x00,
0xff, 0x00, 0x00, 0x00,
// 2
0x08, 0x00,
0x02, 0x00,
0xaa, 0xbb, 0xcc, 0xdd,
// 3
0x04, 0x00,
0x03, 0x00,
// 4
0x10, 0x00,
0x04, 0x00,
0x11, 0x11, 0x11, 0x11,
0x22, 0x22, 0x22, 0x22,
0x33, 0x33, 0x33, 0x33,
},
},
{
name: "multiple attributes, length calculated",
attrs: []Attribute{
{
Type: 1,
Data: []byte{0xff},
},
{
Type: 2,
Data: []byte{0xaa, 0xbb, 0xcc, 0xdd},
},
{
Type: 3,
Data: make([]byte, 0),
},
{
Type: 4,
Data: []byte{
0x11, 0x11, 0x11, 0x11,
0x22, 0x22, 0x22, 0x22,
0x33, 0x33, 0x33, 0x33,
},
},
},
b: []byte{
// 1
0x05, 0x00,
0x01, 0x00,
0xff, 0x00, 0x00, 0x00,
// 2
0x08, 0x00,
0x02, 0x00,
0xaa, 0xbb, 0xcc, 0xdd,
// 3
0x04, 0x00,
0x03, 0x00,
// 4
0x10, 0x00,
0x04, 0x00,
0x11, 0x11, 0x11, 0x11,
0x22, 0x22, 0x22, 0x22,
0x33, 0x33, 0x33, 0x33,
},
},
{
name: "max type space, length 0",
attrs: []Attribute{
{
Length: 4,
Type: 0xffff,
Data: make([]byte, 0),
},
},
b: []byte{
0x04, 0x00,
0xff, 0xff,
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
b, err := MarshalAttributes(tt.attrs)
if want, got := tt.err, err; want != got {
t.Fatalf("unexpected error:\n- want: %v\n- got: %v",
want, got)
}
if err != nil {
return
}
if want, got := tt.b, b; !bytes.Equal(want, got) {
t.Fatalf("unexpected bytes:\n- want: [%# x]\n- got: [%# x]",
want, got)
}
})
}
}
func TestUnmarshalAttributes(t *testing.T) {
skipBigEndian(t)
tests := []struct {
name string
b []byte
attrs []Attribute
err error
}{
{
name: "empty slice",
},
{
name: "short slice",
b: make([]byte, 3),
err: errInvalidAttribute,
},
{
name: "length too short (<4 bytes)",
b: []byte{
0x03, 0x00,
0x00,
},
err: errInvalidAttribute,
},
{
name: "length too long",
b: []byte{
0xff, 0xff,
0x00, 0x00,
},
err: errInvalidAttribute,
},
{
name: "one attribute, not aligned",
b: []byte{
0x05, 0x00,
0x01, 0x00,
0xff,
},
attrs: []Attribute{{
Length: 5,
Type: 1,
Data: []byte{0xff},
}},
},
{
name: "fuzz crasher: length 1, too short",
b: []byte("\x01\x0000"),
err: errInvalidAttribute,
},
{
name: "no attributes, length 0",
b: []byte{
0x00, 0x00,
0x00, 0x00,
},
},
{
name: "one attribute, no data",
b: []byte{
0x04, 0x00,
0x01, 0x00,
},
attrs: []Attribute{{
Length: 4,
Type: 1,
Data: make([]byte, 0),
}},
},
{
name: "one attribute, padded",
b: []byte{
0x05, 0x00,
0x01, 0x00,
0xff, 0x00, 0x00, 0x00,
},
attrs: []Attribute{{
Length: 5,
Type: 1,
Data: []byte{0xff},
}},
},
{
name: "one attribute, aligned",
b: []byte{
0x08, 0x00,
0x02, 0x00,
0xaa, 0xbb, 0xcc, 0xdd,
},
attrs: []Attribute{{
Length: 8,
Type: 2,
Data: []byte{0xaa, 0xbb, 0xcc, 0xdd},
}},
},
{
name: "multiple attributes",
b: []byte{
// 1
0x05, 0x00,
0x01, 0x00,
0xff, 0x00, 0x00, 0x00,
// 2
0x08, 0x00,
0x02, 0x00,
0xaa, 0xbb, 0xcc, 0xdd,
// 3
0x04, 0x00,
0x03, 0x00,
// 4
0x10, 0x00,
0x04, 0x00,
0x11, 0x11, 0x11, 0x11,
0x22, 0x22, 0x22, 0x22,
0x33, 0x33, 0x33, 0x33,
},
attrs: []Attribute{
{
Length: 5,
Type: 1,
Data: []byte{0xff},
},
{
Length: 8,
Type: 2,
Data: []byte{0xaa, 0xbb, 0xcc, 0xdd},
},
{
Length: 4,
Type: 3,
Data: make([]byte, 0),
},
{
Length: 16,
Type: 4,
Data: []byte{
0x11, 0x11, 0x11, 0x11,
0x22, 0x22, 0x22, 0x22,
0x33, 0x33, 0x33, 0x33,
},
},
},
},
{
name: "max type space, length 0",
b: []byte{
0x04, 0x00,
0xff, 0xff,
},
attrs: []Attribute{
{
Length: 4,
Type: 0xffff,
Data: make([]byte, 0),
},
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
attrs, err := UnmarshalAttributes(tt.b)
if want, got := tt.err, err; want != got {
t.Fatalf("unexpected error:\n- want: %v\n- got: %v",
want, got)
}
if err != nil {
return
}
if want, got := tt.attrs, attrs; !reflect.DeepEqual(want, got) {
t.Fatalf("unexpected attributes:\n- want: %v\n- got: %v",
want, got)
}
})
}
}
func TestAttributeDecoderError(t *testing.T) {
bad := []Attribute{{
Type: 1,
// Doesn't fit any integer types.
Data: []byte{0xe, 0xad, 0xbe},
}}
skipBigEndian(t)
tests := []struct {
name string
attrs []Attribute
fn func(ad *AttributeDecoder)
}{
{
name: "uint8",
attrs: bad,
fn: func(ad *AttributeDecoder) {
ad.Uint8()
ad.Next()
ad.Uint8()
},
},
{
name: "uint16",
attrs: bad,
fn: func(ad *AttributeDecoder) {
ad.Uint16()
ad.Next()
ad.Uint16()
},
},
{
name: "uint32",
attrs: bad,
fn: func(ad *AttributeDecoder) {
ad.Uint32()
ad.Next()
ad.Uint32()
},
},
{
name: "uint64",
attrs: bad,
fn: func(ad *AttributeDecoder) {
ad.Uint64()
ad.Next()
ad.Uint64()
},
},
{
name: "int8",
attrs: bad,
fn: func(ad *AttributeDecoder) {
ad.Int8()
ad.Next()
ad.Int8()
},
},
{
name: "int16",
attrs: bad,
fn: func(ad *AttributeDecoder) {
ad.Int16()
ad.Next()
ad.Int16()
},
},
{
name: "int32",
attrs: bad,
fn: func(ad *AttributeDecoder) {
ad.Int32()
ad.Next()
ad.Int32()
},
},
{
name: "int64",
attrs: bad,
fn: func(ad *AttributeDecoder) {
ad.Int64()
ad.Next()
ad.Int64()
},
},
{
name: "do",
attrs: bad,
fn: func(ad *AttributeDecoder) {
ad.Do(func(_ []byte) error {
return errors.New("some error")
})
ad.Do(func(_ []byte) error {
panic("shouldn't be called")
})
},
},
{
name: "flag",
attrs: []Attribute{{
Type: 1,
// Flag data is not empty.
Data: []byte{0xff},
}},
fn: func(ad *AttributeDecoder) {
ad.Flag()
ad.Next()
ad.Flag()
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
b, err := MarshalAttributes(tt.attrs)
if err != nil {
t.Fatalf("failed to marshal attributes: %v", err)
}
ad, err := NewAttributeDecoder(b)
if err != nil {
t.Fatalf("failed to create attribute decoder: %v", err)
}
for ad.Next() {
tt.fn(ad)
}
if err := ad.Err(); err == nil {
t.Fatal("expected an error, but none occurred")
}
})
}
}
func TestAttributeDecoderOK(t *testing.T) {
skipBigEndian(t)
tests := []struct {
name string
attrs []Attribute
fn func(ad *AttributeDecoder)
}{
{
name: "empty",
attrs: nil,
fn: func(_ *AttributeDecoder) {
panic("should not be called")
},
},
{
name: "uint-int native endian",
attrs: adEndianAttrs(binary.NativeEndian),
fn: adEndianTest(binary.NativeEndian),
},
{
name: "uint-int little endian",
attrs: adEndianAttrs(binary.LittleEndian),
fn: adEndianTest(binary.LittleEndian),
},
{
name: "uint-int big endian",
attrs: adEndianAttrs(binary.BigEndian),
fn: adEndianTest(binary.BigEndian),
},
{
name: "bytes",
attrs: []Attribute{{
Type: 1,
Data: []byte{0xde, 0xad},
}},
fn: func(ad *AttributeDecoder) {
var b []byte
switch t := ad.Type(); t {
case 1:
b = ad.Bytes()
default:
panicf("unhandled attribute type: %d", t)
}
if diff := cmp.Diff([]byte{0xde, 0xad}, b); diff != "" {
panicf("unexpected attribute value (-want +got):\n%s", diff)
}
b[0] = 0xff
if diff := cmp.Diff(b, ad.Bytes()); diff == "" {
panic("expected attribute value to be copied and different")
}
},
},
{
name: "string",
attrs: []Attribute{{
Type: 1,
// The string should be able to contain extra trailing NULL
// bytes which will all be removed automatically.
Data: nlenc.Bytes("hello world\x00\x00\x00"),
}},
fn: func(ad *AttributeDecoder) {
var s string
switch t := ad.Type(); t {
case 1:
s = ad.String()
default:
panicf("unhandled attribute type: %d", t)
}
if diff := cmp.Diff("hello world", s); diff != "" {
panicf("unexpected attribute value (-want +got):\n%s", diff)
}
},
},
{
name: "flag",
attrs: []Attribute{{
Type: 1,
}},
fn: func(ad *AttributeDecoder) {
var flag bool
switch t := ad.Type(); t {
case 1:
flag = ad.Flag()
default:
panicf("unhandled attribute type: %d", t)
}
if !flag {
panic("flag was not set")
}
},
},
{
name: "do",
attrs: []Attribute{
// Arbitrary C-like structure.
{
Type: 1,
Data: []byte{
// uint16
0xde, 0xad,
// uint8
0xbe,
// padding
0x00,
},
},
// Nested attributes.
{
Type: 2,
Data: func() []byte {
b, err := MarshalAttributes([]Attribute{{
Type: 2,
Data: nlenc.Uint16Bytes(2),
}})
if err != nil {
panicf("failed to marshal test attributes: %v", err)
}
return b
}(),
},
},
fn: func(ad *AttributeDecoder) {
switch t := ad.Type(); t {
case 1:
type cstruct struct {
A uint16
B uint8
}
want := cstruct{
// Little-endian is the worst.
A: 0xadde,
B: 0xbe,
}
ad.Do(func(b []byte) error {
// unsafe invariant check.
if want, got := int(unsafe.Sizeof(cstruct{})), len(b); want != got {
panicf("unexpected struct size: want: %d, got: %d", want, got)
}
got := *(*cstruct)(unsafe.Pointer(&b[0]))
if diff := cmp.Diff(want, got); diff != "" {
panicf("unexpected struct (-want +got):\n%s", diff)
}
return nil
})
case 2:
ad.Do(func(b []byte) error {
adi, err := NewAttributeDecoder(b)
if err != nil {
return err
}
var got int
first := true
for adi.Next() {
if !first {
panic("loop iterated too many times")
}
first = false
if adi.Type() != 2 {
panicf("unhandled attribute type: %d", t)
}
got = int(adi.Uint16())
}
if diff := cmp.Diff(2, got); diff != "" {
panicf("unexpected nested attribute value (-want +got):\n%s", diff)
}
return adi.Err()
})
default:
panicf("unhandled attribute type: %d", t)
}
},
},
{
name: "nested",
attrs: []Attribute{
// Nested attributes.
{
Type: Nested | 1,
Data: func() []byte {
nb, err := MarshalAttributes([]Attribute{{
Type: 1,
Data: nlenc.Uint32Bytes(2),
}})
if err != nil {
panicf("failed to marshal nested test attributes: %v", err)
}
b, err := MarshalAttributes([]Attribute{
{
Type: 1,
Data: nlenc.Uint16Bytes(1),
},
{
Type: Nested | 2,
Data: nb,
},
})
if err != nil {
panicf("failed to marshal test attributes: %v", err)
}
return b
}(),
},
},
fn: func(ad *AttributeDecoder) {
if diff := cmp.Diff(uint16(1), ad.Type()); diff != "" {
panicf("unexpected attribute type (-want +got):\n%s", diff)
}
ad.Nested(func(nad *AttributeDecoder) error {
for nad.Next() {
switch t := nad.Type(); t {
case 1:
if diff := cmp.Diff(uint16(1), nad.Uint16()); diff != "" {
panicf("unexpected nested uint16 (-want +got):\n%s", diff)
}
case 2:
nad.Nested(func(nnad *AttributeDecoder) error {
for nad.Next() {
if diff := cmp.Diff(uint16(1), nnad.Type()); diff != "" {
panicf("unexpected nested attribute type (-want +got):\n%s", diff)
}
if diff := cmp.Diff(uint32(2), nnad.Uint32()); diff != "" {
panicf("unexpected nested uint32 (-want +got):\n%s", diff)
}
}
return nil
})
default:
panicf("unhandled nested attribute type: %d", t)
}
}
return nil
})
},
},
{
name: "typeflags",
attrs: []Attribute{{
Type: 0xffff,
}},
fn: func(ad *AttributeDecoder) {
if diff := cmp.Diff(ad.Type(), uint16(0x3fff)); diff != "" {
panicf("unexpected Type (-want +got):\n%s", diff)
}
if diff := cmp.Diff(ad.TypeFlags(), uint16(0xc000)); diff != "" {
panicf("unexpected TypeFlags (-want +got):\n%s", diff)
}
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
b, err := MarshalAttributes(tt.attrs)
if err != nil {
t.Fatalf("failed to marshal attributes: %v", err)
}
ad, err := NewAttributeDecoder(b)
if err != nil {
t.Fatalf("failed to create attribute decoder: %v", err)
}
// Len should always report the same number of input attributes.
if diff := cmp.Diff(len(tt.attrs), ad.Len()); diff != "" {
t.Fatalf("unexpected (-want +got):\n%s", diff)
}
for ad.Next() {
tt.fn(ad)
}
if err := ad.Err(); err != nil {
t.Fatalf("failed to decode attributes: %v", err)
}
})
}
}
func adEndianAttrs(order binary.ByteOrder) []Attribute {
return []Attribute{
{
Type: 1,
Data: func() []byte {
return []byte{1}
}(),
},
{
Type: 2,
Data: func() []byte {
b := make([]byte, 2)
order.PutUint16(b, 2)
return b
}(),
},
{
Type: 3,
Data: func() []byte {
b := make([]byte, 4)
order.PutUint32(b, 3)
return b
}(),
},
{
Type: 4,
Data: func() []byte {
b := make([]byte, 8)
order.PutUint64(b, 4)
return b
}(),
},
{
Type: 5,
Data: func() []byte {
return []byte{uint8(int8(5))}
}(),
},
{
Type: 6,
Data: func() []byte {
b := make([]byte, 2)
order.PutUint16(b, uint16(int16(6)))
return b
}(),
},
{
Type: 7,
Data: func() []byte {
b := make([]byte, 4)
order.PutUint32(b, uint32(int32(7)))
return b
}(),
},
{
Type: 8,
Data: func() []byte {
b := make([]byte, 8)
order.PutUint64(b, uint64(int64(8)))
return b
}(),
},
}
}
func adEndianTest(order binary.ByteOrder) func(ad *AttributeDecoder) {
return func(ad *AttributeDecoder) {
ad.ByteOrder = order
var (
t uint16
v int
)
switch t = ad.Type(); t {
case 1:
v = int(ad.Uint8())
case 2:
v = int(ad.Uint16())
case 3:
v = int(ad.Uint32())
case 4:
v = int(ad.Uint64())
case 5:
v = int(ad.Int8())
case 6:
v = int(ad.Int16())
case 7:
v = int(ad.Int32())
case 8:
v = int(ad.Int64())
default:
panicf("unhandled attribute type: %d", t)
}
if diff := cmp.Diff(int(t), v); diff != "" {
panicf("unexpected attribute value (-want +got):\n%s", diff)
}
}
}
func TestAttributeEncoderError(t *testing.T) {
skipBigEndian(t)
tests := []struct {
name string
fn func(ae *AttributeEncoder)
}{
{
name: "bytes length",
fn: func(ae *AttributeEncoder) {
ae.Bytes(1, make([]byte, math.MaxUint16))
},
},
{
name: "string length",
fn: func(ae *AttributeEncoder) {
ae.String(1, string(make([]byte, math.MaxUint16)))
},
},
{
name: "do length",
fn: func(ae *AttributeEncoder) {
ae.Do(1, func() ([]byte, error) {
return make([]byte, math.MaxUint16), nil
})
},
},
{
name: "do function",
fn: func(ae *AttributeEncoder) {
ae.Do(1, func() ([]byte, error) {
return nil, errors.New("testing error")
})
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
ae := NewAttributeEncoder()
tt.fn(ae)
_, err := ae.Encode()
if err == nil {
t.Fatal("expected an error, but none occurred")
}
})
}
}