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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 testbench
import (
"testing"
"gvisor.dev/gvisor/pkg/tcpip"
)
func TestLayerMatch(t *testing.T) {
var nilPayload *Payload
noPayload := &Payload{}
emptyPayload := &Payload{Bytes: []byte{}}
fullPayload := &Payload{Bytes: []byte{1, 2, 3}}
emptyTCP := &TCP{SrcPort: Uint16(1234), LayerBase: LayerBase{nextLayer: emptyPayload}}
fullTCP := &TCP{SrcPort: Uint16(1234), LayerBase: LayerBase{nextLayer: fullPayload}}
for _, tt := range []struct {
a, b Layer
want bool
}{
{nilPayload, nilPayload, true},
{nilPayload, noPayload, true},
{nilPayload, emptyPayload, true},
{nilPayload, fullPayload, true},
{noPayload, noPayload, true},
{noPayload, emptyPayload, true},
{noPayload, fullPayload, true},
{emptyPayload, emptyPayload, true},
{emptyPayload, fullPayload, false},
{fullPayload, fullPayload, true},
{emptyTCP, fullTCP, true},
} {
if got := tt.a.match(tt.b); got != tt.want {
t.Errorf("%s.match(%s) = %t, want %t", tt.a, tt.b, got, tt.want)
}
if got := tt.b.match(tt.a); got != tt.want {
t.Errorf("%s.match(%s) = %t, want %t", tt.b, tt.a, got, tt.want)
}
}
}
func TestLayerStringFormat(t *testing.T) {
for _, tt := range []struct {
name string
l Layer
want string
}{
{
name: "TCP",
l: &TCP{
SrcPort: Uint16(34785),
DstPort: Uint16(47767),
SeqNum: Uint32(3452155723),
AckNum: Uint32(2596996163),
DataOffset: Uint8(5),
Flags: Uint8(20),
WindowSize: Uint16(64240),
Checksum: Uint16(0x2e2b),
},
want: "&testbench.TCP{" +
"SrcPort:34785 " +
"DstPort:47767 " +
"SeqNum:3452155723 " +
"AckNum:2596996163 " +
"DataOffset:5 " +
"Flags:20 " +
"WindowSize:64240 " +
"Checksum:11819" +
"}",
},
{
name: "UDP",
l: &UDP{
SrcPort: Uint16(34785),
DstPort: Uint16(47767),
Length: Uint16(12),
},
want: "&testbench.UDP{" +
"SrcPort:34785 " +
"DstPort:47767 " +
"Length:12" +
"}",
},
{
name: "IPv4",
l: &IPv4{
IHL: Uint8(5),
TOS: Uint8(0),
TotalLength: Uint16(44),
ID: Uint16(0),
Flags: Uint8(2),
FragmentOffset: Uint16(0),
TTL: Uint8(64),
Protocol: Uint8(6),
Checksum: Uint16(0x2e2b),
SrcAddr: Address(tcpip.Address([]byte{197, 34, 63, 10})),
DstAddr: Address(tcpip.Address([]byte{197, 34, 63, 20})),
},
want: "&testbench.IPv4{" +
"IHL:5 " +
"TOS:0 " +
"TotalLength:44 " +
"ID:0 " +
"Flags:2 " +
"FragmentOffset:0 " +
"TTL:64 " +
"Protocol:6 " +
"Checksum:11819 " +
"SrcAddr:197.34.63.10 " +
"DstAddr:197.34.63.20" +
"}",
},
{
name: "Ether",
l: &Ether{
SrcAddr: LinkAddress(tcpip.LinkAddress([]byte{0x02, 0x42, 0xc5, 0x22, 0x3f, 0x0a})),
DstAddr: LinkAddress(tcpip.LinkAddress([]byte{0x02, 0x42, 0xc5, 0x22, 0x3f, 0x14})),
Type: NetworkProtocolNumber(4),
},
want: "&testbench.Ether{" +
"SrcAddr:02:42:c5:22:3f:0a " +
"DstAddr:02:42:c5:22:3f:14 " +
"Type:4" +
"}",
},
{
name: "Payload",
l: &Payload{
Bytes: []byte("Hooray for packetimpact."),
},
want: "&testbench.Payload{Bytes:\n" +
"00000000 48 6f 6f 72 61 79 20 66 6f 72 20 70 61 63 6b 65 |Hooray for packe|\n" +
"00000010 74 69 6d 70 61 63 74 2e |timpact.|\n" +
"}",
},
} {
t.Run(tt.name, func(t *testing.T) {
if got := tt.l.String(); got != tt.want {
t.Errorf("%s.String() = %s, want: %s", tt.name, got, tt.want)
}
})
}
}
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