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// Copyright 2012 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 tcpreader
import (
"bytes"
"fmt"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/tcpassembly"
"io"
"net"
"testing"
)
var netFlow gopacket.Flow
func init() {
netFlow, _ = gopacket.FlowFromEndpoints(
layers.NewIPEndpoint(net.IP{1, 2, 3, 4}),
layers.NewIPEndpoint(net.IP{5, 6, 7, 8}))
}
type readReturn struct {
data []byte
err error
}
type readSequence struct {
in []layers.TCP
want []readReturn
}
type testReaderFactory struct {
lossErrors bool
readSize int
ReaderStream
output chan []byte
}
func (t *testReaderFactory) New(a, b gopacket.Flow) tcpassembly.Stream {
return &t.ReaderStream
}
func testReadSequence(t *testing.T, lossErrors bool, readSize int, seq readSequence) {
f := &testReaderFactory{ReaderStream: NewReaderStream()}
f.ReaderStream.LossErrors = lossErrors
p := tcpassembly.NewStreamPool(f)
a := tcpassembly.NewAssembler(p)
buf := make([]byte, readSize)
go func() {
for i, test := range seq.in {
fmt.Println("Assembling", i)
a.Assemble(netFlow, &test)
fmt.Println("Assembly done")
}
}()
for i, test := range seq.want {
fmt.Println("Waiting for read", i)
n, err := f.Read(buf[:])
fmt.Println("Got read")
if n != len(test.data) {
t.Errorf("test %d want %d bytes, got %d bytes", i, len(test.data), n)
} else if err != test.err {
t.Errorf("test %d want err %v, got err %v", i, test.err, err)
} else if !bytes.Equal(buf[:n], test.data) {
t.Errorf("test %d\nwant: %v\n got: %v\n", i, test.data, buf[:n])
}
}
fmt.Println("All done reads")
}
func TestRead(t *testing.T) {
testReadSequence(t, false, 10, readSequence{
in: []layers.TCP{
{
SYN: true,
SrcPort: 1,
DstPort: 2,
Seq: 1000,
BaseLayer: layers.BaseLayer{Payload: []byte{1, 2, 3}},
},
{
FIN: true,
SrcPort: 1,
DstPort: 2,
Seq: 1004,
},
},
want: []readReturn{
{data: []byte{1, 2, 3}},
{err: io.EOF},
},
})
}
func TestReadSmallChunks(t *testing.T) {
testReadSequence(t, false, 2, readSequence{
in: []layers.TCP{
{
SYN: true,
SrcPort: 1,
DstPort: 2,
Seq: 1000,
BaseLayer: layers.BaseLayer{Payload: []byte{1, 2, 3}},
},
{
FIN: true,
SrcPort: 1,
DstPort: 2,
Seq: 1004,
},
},
want: []readReturn{
{data: []byte{1, 2}},
{data: []byte{3}},
{err: io.EOF},
},
})
}
func ExampleDiscardBytesToEOF() {
b := bytes.NewBuffer([]byte{1, 2, 3, 4, 5})
fmt.Println(DiscardBytesToEOF(b))
// Output:
// 5
}
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