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// Copyright 2016, Google, Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
package layers
import (
"reflect"
"testing"
"github.com/gopacket/gopacket"
)
func TestTCPOptionKindString(t *testing.T) {
testData := []struct {
o *TCPOption
s string
}{
{&TCPOption{
OptionType: TCPOptionKindNop,
OptionLength: 1,
},
"TCPOption(NOP:)"},
{&TCPOption{
OptionType: TCPOptionKindMSS,
OptionLength: 4,
OptionData: []byte{0x12, 0x34},
},
"TCPOption(MSS:4660 0x1234)"},
{&TCPOption{
OptionType: TCPOptionKindTimestamps,
OptionLength: 10,
OptionData: []byte{0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x01},
},
"TCPOption(Timestamps:2/1 0x0000000200000001)"}}
for _, tc := range testData {
if s := tc.o.String(); s != tc.s {
t.Errorf("expected %#v string to be %s, got %s", tc.o, tc.s, s)
}
}
}
func TestTCPSerializePadding(t *testing.T) {
tcp := &TCP{}
tcp.Options = append(tcp.Options, TCPOption{
OptionType: TCPOptionKindNop,
OptionLength: 1,
})
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{FixLengths: true}
err := gopacket.SerializeLayers(buf, opts, tcp)
if err != nil {
t.Fatal(err)
}
if len(buf.Bytes())%4 != 0 {
t.Errorf("TCP data of len %d not padding to 32 bit boundary", len(buf.Bytes()))
}
}
// testPacketTCPOptionDecode is the packet:
//
// 16:17:26.239051 IP 192.168.0.1.12345 > 192.168.0.2.54321: Flags [S], seq 3735928559:3735928563, win 0, options [mss 8192,eol], length 4
// 0x0000: 0000 0000 0001 0000 0000 0001 0800 4500 ..............E.
// 0x0010: 0034 0000 0000 8006 b970 c0a8 0001 c0a8 .4.......p......
// 0x0020: 0002 3039 d431 dead beef 0000 0000 7002 ..09.1........p.
// 0x0030: 0000 829c 0000 0204 2000 0000 0000 5465 ..............Te
// 0x0040: 7374 st
var testPacketTCPOptionDecode = []byte{
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x08, 0x00, 0x45, 0x00,
0x00, 0x34, 0x00, 0x00, 0x00, 0x00, 0x80, 0x06, 0xb9, 0x70, 0xc0, 0xa8, 0x00, 0x01, 0xc0, 0xa8,
0x00, 0x02, 0x30, 0x39, 0xd4, 0x31, 0xde, 0xad, 0xbe, 0xef, 0x00, 0x00, 0x00, 0x00, 0x70, 0x02,
0x00, 0x00, 0x82, 0x9c, 0x00, 0x00, 0x02, 0x04, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x54, 0x65,
0x73, 0x74,
}
func TestPacketTCPOptionDecode(t *testing.T) {
p := gopacket.NewPacket(testPacketTCPOptionDecode, LinkTypeEthernet, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
tcp := p.Layer(LayerTypeTCP).(*TCP)
if tcp == nil {
t.Error("Expected TCP layer, but got none")
}
expected := []TCPOption{
{
OptionType: TCPOptionKindMSS,
OptionLength: 4,
OptionData: []byte{32, 00},
},
{
OptionType: TCPOptionKindEndList,
OptionLength: 1,
},
}
if !reflect.DeepEqual(expected, tcp.Options) {
t.Errorf("expected options to be %#v, but got %#v", expected, tcp.Options)
}
}
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