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// Copyright 2020 The gVisor Authors.
//
// 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 message_test
import (
"bytes"
"reflect"
"testing"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/socket/netlink"
)
type dummyNetlinkMsg struct {
Foo uint16
}
func TestParseMessage(t *testing.T) {
tests := []struct {
desc string
input []byte
header linux.NetlinkMessageHeader
dataMsg *dummyNetlinkMsg
restLen int
ok bool
}{
{
desc: "valid",
input: []byte{
0x14, 0x00, 0x00, 0x00, // Length
0x01, 0x00, // Type
0x02, 0x00, // Flags
0x03, 0x00, 0x00, 0x00, // Seq
0x04, 0x00, 0x00, 0x00, // PortID
0x30, 0x31, 0x00, 0x00, // Data message with 2 bytes padding
},
header: linux.NetlinkMessageHeader{
Length: 20,
Type: 1,
Flags: 2,
Seq: 3,
PortID: 4,
},
dataMsg: &dummyNetlinkMsg{
Foo: 0x3130,
},
restLen: 0,
ok: true,
},
{
desc: "valid with next message",
input: []byte{
0x14, 0x00, 0x00, 0x00, // Length
0x01, 0x00, // Type
0x02, 0x00, // Flags
0x03, 0x00, 0x00, 0x00, // Seq
0x04, 0x00, 0x00, 0x00, // PortID
0x30, 0x31, 0x00, 0x00, // Data message with 2 bytes padding
0xFF, // Next message (rest)
},
header: linux.NetlinkMessageHeader{
Length: 20,
Type: 1,
Flags: 2,
Seq: 3,
PortID: 4,
},
dataMsg: &dummyNetlinkMsg{
Foo: 0x3130,
},
restLen: 1,
ok: true,
},
{
desc: "valid for last message without padding",
input: []byte{
0x12, 0x00, 0x00, 0x00, // Length
0x01, 0x00, // Type
0x02, 0x00, // Flags
0x03, 0x00, 0x00, 0x00, // Seq
0x04, 0x00, 0x00, 0x00, // PortID
0x30, 0x31, // Data message
},
header: linux.NetlinkMessageHeader{
Length: 18,
Type: 1,
Flags: 2,
Seq: 3,
PortID: 4,
},
dataMsg: &dummyNetlinkMsg{
Foo: 0x3130,
},
restLen: 0,
ok: true,
},
{
desc: "valid for last message not to be aligned",
input: []byte{
0x13, 0x00, 0x00, 0x00, // Length
0x01, 0x00, // Type
0x02, 0x00, // Flags
0x03, 0x00, 0x00, 0x00, // Seq
0x04, 0x00, 0x00, 0x00, // PortID
0x30, 0x31, // Data message
0x00, // Excessive 1 byte permitted at end
},
header: linux.NetlinkMessageHeader{
Length: 19,
Type: 1,
Flags: 2,
Seq: 3,
PortID: 4,
},
dataMsg: &dummyNetlinkMsg{
Foo: 0x3130,
},
restLen: 0,
ok: true,
},
{
desc: "header.Length too short",
input: []byte{
0x04, 0x00, 0x00, 0x00, // Length
0x01, 0x00, // Type
0x02, 0x00, // Flags
0x03, 0x00, 0x00, 0x00, // Seq
0x04, 0x00, 0x00, 0x00, // PortID
0x30, 0x31, 0x00, 0x00, // Data message with 2 bytes padding
},
ok: false,
},
{
desc: "header.Length too long",
input: []byte{
0xFF, 0xFF, 0x00, 0x00, // Length
0x01, 0x00, // Type
0x02, 0x00, // Flags
0x03, 0x00, 0x00, 0x00, // Seq
0x04, 0x00, 0x00, 0x00, // PortID
0x30, 0x31, 0x00, 0x00, // Data message with 2 bytes padding
},
ok: false,
},
{
desc: "header incomplete",
input: []byte{
0x04, 0x00, 0x00, 0x00, // Length
},
ok: false,
},
{
desc: "empty message",
input: []byte{},
ok: false,
},
}
for _, test := range tests {
msg, rest, ok := netlink.ParseMessage(test.input)
if ok != test.ok {
t.Errorf("%v: got ok = %v, want = %v", test.desc, ok, test.ok)
continue
}
if !test.ok {
continue
}
if !reflect.DeepEqual(msg.Header(), test.header) {
t.Errorf("%v: got hdr = %+v, want = %+v", test.desc, msg.Header(), test.header)
}
dataMsg := &dummyNetlinkMsg{}
_, dataOk := msg.GetData(dataMsg)
if !dataOk {
t.Errorf("%v: GetData.ok = %v, want = true", test.desc, dataOk)
} else if !reflect.DeepEqual(dataMsg, test.dataMsg) {
t.Errorf("%v: GetData.msg = %+v, want = %+v", test.desc, dataMsg, test.dataMsg)
}
if got, want := rest, test.input[len(test.input)-test.restLen:]; !bytes.Equal(got, want) {
t.Errorf("%v: got rest = %v, want = %v", test.desc, got, want)
}
}
}
func TestAttrView(t *testing.T) {
tests := []struct {
desc string
input []byte
// Outputs for ParseFirst.
hdr linux.NetlinkAttrHeader
value []byte
restLen int
ok bool
// Outputs for Empty.
isEmpty bool
}{
{
desc: "valid",
input: []byte{
0x06, 0x00, // Length
0x01, 0x00, // Type
0x30, 0x31, 0x00, 0x00, // Data with 2 bytes padding
},
hdr: linux.NetlinkAttrHeader{
Length: 6,
Type: 1,
},
value: []byte{0x30, 0x31},
restLen: 0,
ok: true,
isEmpty: false,
},
{
desc: "at alignment",
input: []byte{
0x08, 0x00, // Length
0x01, 0x00, // Type
0x30, 0x31, 0x32, 0x33, // Data
},
hdr: linux.NetlinkAttrHeader{
Length: 8,
Type: 1,
},
value: []byte{0x30, 0x31, 0x32, 0x33},
restLen: 0,
ok: true,
isEmpty: false,
},
{
desc: "at alignment with rest data",
input: []byte{
0x08, 0x00, // Length
0x01, 0x00, // Type
0x30, 0x31, 0x32, 0x33, // Data
0xFF, 0xFE, // Rest data
},
hdr: linux.NetlinkAttrHeader{
Length: 8,
Type: 1,
},
value: []byte{0x30, 0x31, 0x32, 0x33},
restLen: 2,
ok: true,
isEmpty: false,
},
{
desc: "hdr.Length too long",
input: []byte{
0xFF, 0x00, // Length
0x01, 0x00, // Type
0x30, 0x31, 0x32, 0x33, // Data
},
ok: false,
isEmpty: false,
},
{
desc: "hdr.Length too short",
input: []byte{
0x01, 0x00, // Length
0x01, 0x00, // Type
0x30, 0x31, 0x32, 0x33, // Data
},
ok: false,
isEmpty: false,
},
{
desc: "empty",
input: []byte{},
ok: false,
isEmpty: true,
},
}
for _, test := range tests {
attrs := netlink.AttrsView(test.input)
// Test ParseFirst().
hdr, value, rest, ok := attrs.ParseFirst()
if ok != test.ok {
t.Errorf("%v: got ok = %v, want = %v", test.desc, ok, test.ok)
} else if test.ok {
if !reflect.DeepEqual(hdr, test.hdr) {
t.Errorf("%v: got hdr = %+v, want = %+v", test.desc, hdr, test.hdr)
}
if !bytes.Equal(value, test.value) {
t.Errorf("%v: got value = %v, want = %v", test.desc, value, test.value)
}
if wantRest := test.input[len(test.input)-test.restLen:]; !bytes.Equal(rest, wantRest) {
t.Errorf("%v: got rest = %v, want = %v", test.desc, rest, wantRest)
}
}
// Test Empty().
if got, want := attrs.Empty(), test.isEmpty; got != want {
t.Errorf("%v: got empty = %v, want = %v", test.desc, got, want)
}
}
}
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