func (i *Sniffer) decodePackets() {
var eth layers.Ethernet
var ip layers.IPv4
var tcp layers.TCP
var payload gopacket.Payload
parser := gopacket.NewDecodingLayerParser(layers.LayerTypeEthernet, ð, &ip, &tcp, &payload)
decoded := make([]gopacket.LayerType, 0, 4)
for {
select {
case <-i.stopDecodeChan:
return
case timedRawPacket := <-i.decodePacketChan:
newPayload := new(gopacket.Payload)
payload = *newPayload
err := parser.DecodeLayers(timedRawPacket.RawPacket, &decoded)
if err != nil {
continue
}
flow := types.NewTcpIpFlowFromFlows(ip.NetworkFlow(), tcp.TransportFlow())
packetManifest := types.PacketManifest{
Timestamp: timedRawPacket.Timestamp,
Flow: flow,
RawPacket: timedRawPacket.RawPacket,
IP: ip,
TCP: tcp,
Payload: payload,
}
i.dispatcher.ReceivePacket(&packetManifest)
}
}
}
func TestPcapLogger(t *testing.T) {
ipFlow, _ := gopacket.FlowFromEndpoints(layers.NewIPEndpoint(net.IPv4(1, 2, 3, 4)), layers.NewIPEndpoint(net.IPv4(2, 3, 4, 5)))
tcpFlow, _ := gopacket.FlowFromEndpoints(layers.NewTCPPortEndpoint(layers.TCPPort(1)), layers.NewTCPPortEndpoint(layers.TCPPort(2)))
flow := types.NewTcpIpFlowFromFlows(ipFlow, tcpFlow)
pcapLogger := NewPcapLogger("fake-dir", flow)
testWriter := NewTestPcapWriter()
pcapLogger.fileWriter = testWriter
pcapLogger.Start()
// test pcap header
want := []byte("\xd4\xc3\xb2\xa1\x02\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x01\x00\x00\x00")
if !bytes.Equal(testWriter.lastWrite, want) {
t.Errorf("pcap header is wrong")
t.Fail()
}
// test pcap packet
rawPacket := makeTestPacket()
testWriter.lastWrite = make([]byte, 0)
pcapLogger.WritePacket(rawPacket, time.Now())
if !bytes.Equal(testWriter.lastWrite, rawPacket) {
t.Errorf("pcap packet is wrong")
t.Fail()
}
pcapLogger.Stop()
}
func TestGetOverlapRingsWithZeroRings(t *testing.T) {
ip := layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp := layers.TCP{
SYN: true,
SrcPort: 1,
DstPort: 2,
}
tcp.SetNetworkLayerForChecksum(&ip)
payload := gopacket.Payload([]byte{1, 2, 3, 4})
p := types.PacketManifest{
IP: ip,
TCP: tcp,
Payload: payload,
}
options := ConnectionOptions{
MaxBufferedPagesTotal: 0,
MaxBufferedPagesPerConnection: 0,
MaxRingPackets: 40,
PageCache: nil,
LogDir: "fake-log-dir",
}
f := &DefaultConnFactory{}
conn := f.Build(options).(*Connection)
ipFlow, _ := gopacket.FlowFromEndpoints(layers.NewIPEndpoint(net.IPv4(1, 2, 3, 4)), layers.NewIPEndpoint(net.IPv4(2, 3, 4, 5)))
tcpFlow, _ := gopacket.FlowFromEndpoints(layers.NewTCPPortEndpoint(layers.TCPPort(1)), layers.NewTCPPortEndpoint(layers.TCPPort(2)))
serverFlow := types.NewTcpIpFlowFromFlows(ipFlow, tcpFlow)
clientFlow := serverFlow.Reverse()
conn.serverFlow = serverFlow
conn.clientFlow = clientFlow
head, tail := getOverlapRings(&p, serverFlow, conn.ClientStreamRing)
if head == nil || tail == nil {
return
} else {
t.Fail()
}
return
}
func TestOrderedCoalesceUsedPages(t *testing.T) {
maxBufferedPagesTotal := 1024
maxBufferedPagesPerFlow := 1024
streamRing := types.NewRing(40)
PageCache := newPageCache()
ipFlow, _ := gopacket.FlowFromEndpoints(layers.NewIPEndpoint(net.IPv4(1, 2, 3, 4)), layers.NewIPEndpoint(net.IPv4(2, 3, 4, 5)))
tcpFlow, _ := gopacket.FlowFromEndpoints(layers.NewTCPPortEndpoint(layers.TCPPort(1)), layers.NewTCPPortEndpoint(layers.TCPPort(2)))
flow := types.NewTcpIpFlowFromFlows(ipFlow, tcpFlow)
var nextSeq types.Sequence = types.Sequence(1)
coalesce := NewOrderedCoalesce(nil, flow, PageCache, streamRing, maxBufferedPagesTotal, maxBufferedPagesPerFlow, false)
ip := layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp := layers.TCP{
Seq: 3,
SYN: false,
SrcPort: 1,
DstPort: 2,
}
p := types.PacketManifest{
Timestamp: time.Now(),
Flow: flow,
IP: ip,
TCP: tcp,
Payload: []byte{1, 2, 3, 4, 5, 6, 7},
}
coalesce.insert(&p, nextSeq)
if coalesce.PageCache.used != 1 {
t.Errorf("coalesce.pager.Used() not equal to 1\n")
t.Fail()
}
coalesce.Close()
}
func TestTCPHijack(t *testing.T) {
attackLogger := NewDummyAttackLogger()
options := ConnectionOptions{
MaxBufferedPagesTotal: 0,
MaxBufferedPagesPerConnection: 0,
MaxRingPackets: 40,
PageCache: nil,
LogDir: "fake-log-dir",
DetectHijack: true,
}
f := &DefaultConnFactory{}
conn := f.Build(options).(*Connection)
conn.AttackLogger = attackLogger
ip := layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp := layers.TCP{
Seq: 3,
SYN: true,
ACK: false,
SrcPort: 1,
DstPort: 2,
}
ipFlow, _ := gopacket.FlowFromEndpoints(layers.NewIPEndpoint(net.IPv4(1, 2, 3, 4)), layers.NewIPEndpoint(net.IPv4(2, 3, 4, 5)))
tcpFlow, _ := gopacket.FlowFromEndpoints(layers.NewTCPPortEndpoint(layers.TCPPort(1)), layers.NewTCPPortEndpoint(layers.TCPPort(2)))
flow := types.NewTcpIpFlowFromFlows(ipFlow, tcpFlow)
p := types.PacketManifest{
Timestamp: time.Now(),
Flow: flow,
IP: ip,
TCP: tcp,
Payload: []byte{},
}
tcp.SetNetworkLayerForChecksum(&ip)
flowReversed := flow.Reverse()
conn.clientFlow = flow
conn.serverFlow = flowReversed
conn.ReceivePacket(&p)
if conn.state != TCP_CONNECTION_REQUEST {
t.Error("invalid state transition\n")
t.Fail()
}
// next state transition test
ip = layers.IPv4{
SrcIP: net.IP{2, 3, 4, 5},
DstIP: net.IP{1, 2, 3, 4},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp = layers.TCP{
Seq: 9,
SYN: true,
ACK: true,
Ack: 4,
SrcPort: 2,
DstPort: 1,
}
p = types.PacketManifest{
Timestamp: time.Now(),
Flow: flowReversed,
IP: ip,
TCP: tcp,
Payload: []byte{},
}
conn.ReceivePacket(&p)
if conn.state != TCP_CONNECTION_ESTABLISHED {
t.Errorf("invalid state transition: current state %d\n", conn.state)
t.Fail()
}
// test hijack in TCP_CONNECTION_ESTABLISHED state
ip = layers.IPv4{
SrcIP: net.IP{2, 3, 4, 5},
DstIP: net.IP{1, 2, 3, 4},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp = layers.TCP{
Seq: 6699,
SYN: true,
ACK: true,
Ack: 4,
SrcPort: 2,
DstPort: 1,
}
p = types.PacketManifest{
Timestamp: time.Now(),
Flow: flowReversed,
IP: ip,
TCP: tcp,
Payload: []byte{},
}
conn.ReceivePacket(&p)
if attackLogger.Count != 1 {
t.Error("hijack detection fail")
t.Fail()
}
// next state transition test
ip = layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp = layers.TCP{
Seq: 4,
SYN: false,
ACK: true,
Ack: 10,
SrcPort: 1,
DstPort: 2,
}
p = types.PacketManifest{
Timestamp: time.Now(),
Flow: flow,
IP: ip,
TCP: tcp,
Payload: []byte{},
}
conn.ReceivePacket(&p)
if conn.state != TCP_DATA_TRANSFER {
t.Errorf("invalid state transition; state is %d\n", conn.state)
t.Fail()
}
// test hijack in TCP_DATA_TRANSFER state
ip = layers.IPv4{
SrcIP: net.IP{2, 3, 4, 5},
DstIP: net.IP{1, 2, 3, 4},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp = layers.TCP{
Seq: 7711,
SYN: true,
ACK: true,
Ack: 4,
SrcPort: 2,
DstPort: 1,
}
p = types.PacketManifest{
Timestamp: time.Now(),
Flow: flowReversed,
IP: ip,
TCP: tcp,
Payload: []byte{},
}
conn.ReceivePacket(&p)
if attackLogger.Count != 2 {
t.Error("hijack detection fail")
t.Fail()
}
}
func HelperTestThreeWayClose(isClient bool, t *testing.T) {
PageCache := newPageCache()
var closerState, remoteState *uint8
attackLogger := NewDummyAttackLogger()
options := ConnectionOptions{
MaxBufferedPagesTotal: 0,
MaxBufferedPagesPerConnection: 0,
MaxRingPackets: 40,
PageCache: PageCache,
LogDir: "fake-log-dir",
}
f := &DefaultConnFactory{}
conn := f.Build(options).(*Connection)
conn.AttackLogger = attackLogger
conn.state = TCP_DATA_TRANSFER
conn.serverNextSeq = 4666
conn.clientNextSeq = 9666
if isClient {
closerState = &conn.clientState
remoteState = &conn.serverState
} else {
closerState = &conn.serverState
remoteState = &conn.clientState
}
ipFlow, _ := gopacket.FlowFromEndpoints(layers.NewIPEndpoint(net.IPv4(1, 2, 3, 4)), layers.NewIPEndpoint(net.IPv4(2, 3, 4, 5)))
tcpFlow, _ := gopacket.FlowFromEndpoints(layers.NewTCPPortEndpoint(layers.TCPPort(1)), layers.NewTCPPortEndpoint(layers.TCPPort(2)))
ip := layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp := layers.TCP{
Seq: 9666,
Ack: 4111,
FIN: true,
SYN: false,
ACK: true,
SrcPort: 1,
DstPort: 2,
}
flow := types.NewTcpIpFlowFromFlows(ipFlow, tcpFlow)
p := types.PacketManifest{
Timestamp: time.Now(),
Flow: flow,
IP: ip,
TCP: tcp,
Payload: []byte{},
}
conn.clientFlow = flow
conn.serverFlow = flow.Reverse()
conn.ReceivePacket(&p)
log.Print("meow1")
if conn.state != TCP_CONNECTION_CLOSING {
t.Error("connection state must transition to TCP_CONNECTION_CLOSING\n")
t.Fail()
}
if *closerState != TCP_FIN_WAIT1 {
t.Error("closer state must be in TCP_FINE_WAIT1\n")
t.Fail()
}
if *remoteState != TCP_CLOSE_WAIT {
t.Error("remote state must be in TCP_CLOSE_WAIT\n")
t.Fail()
}
// next state transition
ip = layers.IPv4{
SrcIP: net.IP{2, 3, 4, 5},
DstIP: net.IP{1, 2, 3, 4},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp = layers.TCP{
Seq: 4111,
SYN: false,
FIN: true,
ACK: true,
Ack: 9667,
SrcPort: 2,
DstPort: 1,
}
flow2 := flow.Reverse()
p = types.PacketManifest{
Timestamp: time.Now(),
Flow: flow2,
IP: ip,
TCP: tcp,
Payload: []byte{},
}
conn.ReceivePacket(&p)
log.Print("meow2")
if conn.state != TCP_CONNECTION_CLOSING {
t.Error("connection state must transition to TCP_CONNECTION_CLOSING\n")
t.Fail()
}
// next state transition
ip = layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
tcp = layers.TCP{
Seq: 9667,
SYN: false,
FIN: false,
ACK: true,
Ack: 4112,
SrcPort: 1,
DstPort: 2,
}
p = types.PacketManifest{
Timestamp: time.Now(),
Flow: flow,
IP: ip,
TCP: tcp,
Payload: []byte{},
}
conn.ReceivePacket(&p)
log.Print("freeing page cache")
}
func TestGetOverlapRings(t *testing.T) {
overlapTests := []struct {
in reassemblyInput
want []*types.Reassembly
}{
{
reassemblyInput{7, []byte{1, 2}}, []*types.Reassembly{
{
Seq: 5,
},
{
Seq: 5,
},
},
},
{
reassemblyInput{7, []byte{6, 7}}, []*types.Reassembly{
{
Seq: 5,
},
{
Seq: 5,
},
},
},
{
reassemblyInput{5, []byte{1, 2, 3, 4, 5}}, []*types.Reassembly{
{
Seq: 5,
},
{
Seq: 5,
},
},
},
{
reassemblyInput{5, []byte{1, 2, 3, 4, 5, 6}}, []*types.Reassembly{
{
Seq: 5,
},
{
Seq: 10,
},
},
},
{
reassemblyInput{6, []byte{1, 2, 3, 4, 5}}, []*types.Reassembly{
{
Seq: 5,
},
{
Seq: 10,
},
},
},
{
reassemblyInput{7, []byte{1, 2, 3, 4, 5}}, []*types.Reassembly{
{
Seq: 5,
},
{
Seq: 10,
},
},
},
{
reassemblyInput{32, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}}, []*types.Reassembly{
{
Seq: 30,
},
{
Seq: 35,
},
},
},
{
reassemblyInput{0, []byte{1, 2, 3}}, []*types.Reassembly{
nil,
nil,
},
},
{
reassemblyInput{0, []byte{1, 2, 3, 4, 5, 6, 7, 8}}, []*types.Reassembly{
{
Seq: 5,
},
{
Seq: 5,
},
},
},
{
reassemblyInput{0, []byte{1, 2, 3, 4, 5, 6}}, []*types.Reassembly{
{
Seq: 5,
},
{
Seq: 5,
},
},
},
{
reassemblyInput{0, []byte{1, 2, 3}}, []*types.Reassembly{
nil,
nil,
},
},
{
reassemblyInput{0, []byte{1, 2, 3, 4, 5}}, []*types.Reassembly{
nil,
nil,
},
},
{
reassemblyInput{0, []byte{1, 2, 3, 4, 5, 6}}, []*types.Reassembly{
{
Seq: 5,
},
{
Seq: 5,
},
},
},
{
reassemblyInput{40, []byte{1}}, []*types.Reassembly{
nil,
nil,
},
},
{
reassemblyInput{42, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}}, []*types.Reassembly{
nil,
nil,
},
},
{
reassemblyInput{38, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}}, []*types.Reassembly{
{
Seq: 35,
},
{
Seq: 35,
},
},
},
}
ip := layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
options := ConnectionOptions{
MaxBufferedPagesTotal: 0,
MaxBufferedPagesPerConnection: 0,
MaxRingPackets: 40,
PageCache: nil,
LogDir: "fake-log-dir",
}
f := &DefaultConnFactory{}
conn := f.Build(options).(*Connection)
for j := 5; j < 40; j += 5 {
reassembly := types.Reassembly{
Skip: 0,
Seq: types.Sequence(j),
Bytes: []byte{1, 2, 3, 4, 5},
}
conn.ClientStreamRing.Reassembly = &reassembly
conn.ClientStreamRing = conn.ClientStreamRing.Next()
}
for i := 0; i < len(overlapTests); i++ {
log.Printf("test # %d", i)
tcp := layers.TCP{
Seq: overlapTests[i].in.Seq,
SYN: false,
SrcPort: 1,
DstPort: 2,
}
p := types.PacketManifest{
IP: ip,
TCP: tcp,
Payload: overlapTests[i].in.Payload,
}
ipFlow, _ := gopacket.FlowFromEndpoints(layers.NewIPEndpoint(net.IPv4(1, 2, 3, 4)), layers.NewIPEndpoint(net.IPv4(2, 3, 4, 5)))
tcpFlow, _ := gopacket.FlowFromEndpoints(layers.NewTCPPortEndpoint(layers.TCPPort(1)), layers.NewTCPPortEndpoint(layers.TCPPort(2)))
serverFlow := types.NewTcpIpFlowFromFlows(ipFlow, tcpFlow)
clientFlow := serverFlow.Reverse()
conn.serverFlow = serverFlow
conn.clientFlow = clientFlow
head, tail := getOverlapRings(&p, serverFlow, conn.ClientStreamRing)
log.Printf("head %v tail %v", head, tail)
log.Printf("want %v", overlapTests[i].want[0])
if overlapTests[i].want[0] == nil {
log.Print("want nil results")
if head != nil {
t.Error("getOverlapRings did not return a nil ring segment head\n")
t.Fail()
}
if tail != nil {
t.Error("getOverlapRings did not return a nil ring segment tail\n")
t.Fail()
}
} else {
if overlapTests[i].want[0] != nil {
if head == nil || tail == nil {
t.Error("head or tail is nil\n")
t.Fail()
}
}
if overlapTests[i].want[0] != nil {
if head.Reassembly.Seq.Difference(overlapTests[i].want[0].Seq) != 0 {
t.Errorf("test %d: reassembly.Seq %d != want.Seq %d\n", i, head.Reassembly.Seq, overlapTests[i].want[0].Seq)
t.Fail()
}
}
if overlapTests[i].want[1] != nil {
if tail.Reassembly.Seq.Difference(overlapTests[i].want[1].Seq) != 0 {
t.Errorf("test num %d in.Seq %d != want.Seq %d\n", i, head.Reassembly.Seq, overlapTests[i].want[1].Seq)
t.Fail()
}
}
}
}
return
}
func TestInjectionDetector(t *testing.T) {
log.Print("TestInjectionDetector")
attackLogger := NewDummyAttackLogger()
options := ConnectionOptions{
MaxBufferedPagesTotal: 0,
MaxBufferedPagesPerConnection: 0,
MaxRingPackets: 40,
PageCache: nil,
LogDir: "fake-log-dir",
AttackLogger: attackLogger,
}
f := &DefaultConnFactory{}
conn := f.Build(options).(*Connection)
reassembly := types.Reassembly{
Seq: types.Sequence(5),
Bytes: []byte{1, 2, 3, 4, 5},
}
conn.ClientStreamRing.Reassembly = &reassembly
conn.ClientStreamRing = conn.ClientStreamRing.Next()
p := types.PacketManifest{
IP: layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
},
TCP: layers.TCP{
Seq: 7,
SrcPort: 1,
DstPort: 2,
},
Payload: []byte{1, 2, 3, 4, 5, 6, 7},
}
ipFlow, _ := gopacket.FlowFromEndpoints(layers.NewIPEndpoint(net.IPv4(1, 2, 3, 4)), layers.NewIPEndpoint(net.IPv4(2, 3, 4, 5)))
tcpFlow, _ := gopacket.FlowFromEndpoints(layers.NewTCPPortEndpoint(layers.TCPPort(1)), layers.NewTCPPortEndpoint(layers.TCPPort(2)))
serverFlow := types.NewTcpIpFlowFromFlows(ipFlow, tcpFlow)
conn.serverFlow = serverFlow
clientFlow := serverFlow.Reverse()
conn.clientFlow = clientFlow
conn.detectInjection(&p, serverFlow)
if attackLogger.Count != 1 {
t.Errorf("detectInjection failed; count == %d\n", attackLogger.Count)
t.Fail()
}
// next test case
p.TCP = layers.TCP{
Seq: 7,
SrcPort: 1,
DstPort: 2,
}
p.Payload = []byte{3, 4, 5}
conn.detectInjection(&p, serverFlow)
if attackLogger.Count == 0 {
t.Error("failed to detect injection\n")
t.Fail()
}
// next test case
attackLogger.Count = 0
p.TCP = layers.TCP{
Seq: 1,
SrcPort: 1,
DstPort: 2,
}
p.Payload = []byte{1, 2, 3, 4, 5, 6}
conn.detectInjection(&p, serverFlow)
if attackLogger.Count == 0 {
t.Error("failed to detect injection\n")
t.Fail()
}
// next test case
attackLogger.Count = 0
p.TCP = layers.TCP{
Seq: 1,
SrcPort: 1,
DstPort: 2,
}
p.Payload = []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17}
conn.detectInjection(&p, serverFlow)
if attackLogger.Count != 1 {
t.Error("injection detection failure\n")
t.Fail()
}
}
func TestGetOverlapBytes(t *testing.T) {
overlapBytesTests := []struct {
in reassemblyInput
want TestOverlapBytesWant
}{
{ //0
reassemblyInput{3, []byte{2, 3, 4}}, TestOverlapBytesWant{
bytes: []byte{6},
startOffset: 2,
endOffset: 3,
},
},
{ //1
reassemblyInput{4, []byte{2, 3, 4}}, TestOverlapBytesWant{
bytes: []byte{6, 7},
startOffset: 1,
endOffset: 3,
},
},
{ //2
reassemblyInput{5, []byte{2, 3, 4}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8},
startOffset: 0,
endOffset: 3,
},
},
{ //3
reassemblyInput{6, []byte{1, 2, 3}}, TestOverlapBytesWant{
bytes: []byte{7, 8, 9},
startOffset: 0,
endOffset: 3,
},
},
{ //4
reassemblyInput{4, []byte{91, 92, 93, 94, 95, 96, 97}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10, 11},
startOffset: 1,
endOffset: 7,
},
},
{
reassemblyInput{4, []byte{91, 92, 93, 94, 95, 96, 97, 98}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10, 11, 12},
startOffset: 1,
endOffset: 8,
},
},
{
reassemblyInput{4, []byte{91, 92, 93, 94, 95, 96, 97, 98, 99}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10, 11, 12, 13},
startOffset: 1,
endOffset: 9,
},
},
{
reassemblyInput{3, []byte{1, 2, 3, 4, 5, 6, 7}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10},
startOffset: 2,
endOffset: 7,
},
},
{
reassemblyInput{34, []byte{1, 2, 3, 4, 5, 6, 7}}, TestOverlapBytesWant{
bytes: []byte{35, 36, 37, 38, 39, 40},
startOffset: 0,
endOffset: 6,
},
},
{
reassemblyInput{34, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}}, TestOverlapBytesWant{
bytes: []byte{35, 36, 37, 38, 39, 40},
startOffset: 0,
endOffset: 6,
},
},
{
reassemblyInput{5, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40},
startOffset: 0,
endOffset: 35,
},
},
{
reassemblyInput{5, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40},
startOffset: 0,
endOffset: 35,
},
},
{
reassemblyInput{5, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40},
startOffset: 0,
endOffset: 35,
},
},
{
reassemblyInput{4, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40},
startOffset: 1,
endOffset: 36,
},
},
{
reassemblyInput{3, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40},
startOffset: 2,
endOffset: 37,
},
},
{
reassemblyInput{4, []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}}, TestOverlapBytesWant{
bytes: []byte{6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40},
startOffset: 1,
endOffset: 36,
},
},
}
options := ConnectionOptions{
MaxBufferedPagesTotal: 0,
MaxBufferedPagesPerConnection: 0,
MaxRingPackets: 40,
PageCache: nil,
LogDir: "fake-log-dir",
}
f := &DefaultConnFactory{}
conn := f.Build(options).(*Connection)
for j := 5; j < 40; j += 5 {
reassembly := types.Reassembly{
Seq: types.Sequence(j),
Bytes: []byte{byte(j + 1), byte(j + 2), byte(j + 3), byte(j + 4), byte(j + 5)},
}
conn.ClientStreamRing.Reassembly = &reassembly
conn.ClientStreamRing = conn.ClientStreamRing.Next()
}
for i := 0; i < len(overlapBytesTests); i++ {
var startSeq uint32 = overlapBytesTests[i].in.Seq
start := types.Sequence(startSeq)
end := start.Add(len(overlapBytesTests[i].in.Payload) - 1)
p := types.PacketManifest{
IP: layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
},
TCP: layers.TCP{
Seq: startSeq,
SrcPort: 1,
DstPort: 2,
},
Payload: overlapBytesTests[i].in.Payload,
}
ipFlow, _ := gopacket.FlowFromEndpoints(layers.NewIPEndpoint(net.IPv4(1, 2, 3, 4)), layers.NewIPEndpoint(net.IPv4(2, 3, 4, 5)))
tcpFlow, _ := gopacket.FlowFromEndpoints(layers.NewTCPPortEndpoint(layers.TCPPort(1)), layers.NewTCPPortEndpoint(layers.TCPPort(2)))
serverFlow := types.NewTcpIpFlowFromFlows(ipFlow, tcpFlow)
clientFlow := serverFlow.Reverse()
conn.serverFlow = serverFlow
conn.clientFlow = clientFlow
head, tail := getOverlapRings(&p, serverFlow, conn.ClientStreamRing)
if head == nil || tail == nil {
t.Errorf("%d getOverlapRings returned a nil\n", i)
t.Fail()
continue
}
log.Printf("test #%d", i)
overlapBytes, startOffset, endOffset := getOverlapBytes(head, tail, start, end)
if startOffset != overlapBytesTests[i].want.startOffset {
t.Errorf("test %d startOffset %d does not match want.startOffset %d\n", i, startOffset, overlapBytesTests[i].want.startOffset)
t.Fail()
}
if endOffset != overlapBytesTests[i].want.endOffset {
t.Errorf("test %d endOffset %d does not match want.endOffset %d\n", i, endOffset, overlapBytesTests[i].want.endOffset)
t.Fail()
}
if len(overlapBytes) != len(overlapBytesTests[i].want.bytes) {
t.Errorf("test %d overlapBytes len %d not equal to want.bytes len %d\n", i, len(overlapBytes), len(overlapBytesTests[i].want.bytes))
t.Fail()
}
if !bytes.Equal(overlapBytes, overlapBytesTests[i].want.bytes) {
t.Errorf("test %d overlapBytes %x not equal to want.bytes %x\n", i, overlapBytes, overlapBytesTests[i].want.bytes)
t.Fail()
}
}
}
func TestGetRingSlice(t *testing.T) {
options := ConnectionOptions{
MaxBufferedPagesTotal: 0,
MaxBufferedPagesPerConnection: 0,
MaxRingPackets: 40,
PageCache: nil,
LogDir: "fake-log-dir",
}
f := &DefaultConnFactory{}
conn := f.Build(options).(*Connection)
for j := 5; j < 40; j += 5 {
reassembly := types.Reassembly{
Seq: types.Sequence(j),
Bytes: []byte{1, 2, 3, 4, 5},
}
conn.ClientStreamRing.Reassembly = &reassembly
conn.ClientStreamRing = conn.ClientStreamRing.Next()
}
var startSeq uint32 = 5
p := types.PacketManifest{
IP: layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
},
TCP: layers.TCP{
Seq: startSeq,
SrcPort: 1,
DstPort: 2,
},
Payload: []byte{1, 2, 3, 4, 5, 6, 7},
}
ipFlow, _ := gopacket.FlowFromEndpoints(layers.NewIPEndpoint(net.IPv4(1, 2, 3, 4)), layers.NewIPEndpoint(net.IPv4(2, 3, 4, 5)))
tcpFlow, _ := gopacket.FlowFromEndpoints(layers.NewTCPPortEndpoint(layers.TCPPort(1)), layers.NewTCPPortEndpoint(layers.TCPPort(2)))
serverFlow := types.NewTcpIpFlowFromFlows(ipFlow, tcpFlow)
clientFlow := serverFlow.Reverse()
conn.serverFlow = serverFlow
conn.clientFlow = clientFlow
head, tail := getOverlapRings(&p, serverFlow, conn.ClientStreamRing)
if head == nil {
t.Fatal()
}
if tail == nil {
t.Fatal()
}
ringSlice := getRingSlice(head, tail, 0, 1)
if !bytes.Equal(ringSlice, []byte{1, 2, 3, 4, 5, 1}) {
t.Error("byte comparison failed")
t.Fail()
}
ringSlice = getRingSlice(head, tail, 0, 3)
if !bytes.Equal(ringSlice, []byte{1, 2, 3, 4, 5, 1, 2, 3}) {
t.Error("byte comparison failed")
t.Fail()
}
ringSlice = getRingSlice(head, tail, 0, 1)
if !bytes.Equal(ringSlice, []byte{1, 2, 3, 4, 5, 1}) {
t.Error("byte comparison failed")
t.Fail()
}
ringSlice = getRingSlice(head, tail, 1, 0)
if !bytes.Equal(ringSlice, []byte{2, 3, 4, 5}) {
t.Error("byte comparison failed")
t.Fail()
}
ringSlice = getRingSlice(head, tail, 1, 1)
if !bytes.Equal(ringSlice, []byte{2, 3, 4, 5, 1}) {
t.Error("byte comparison failed")
t.Fail()
}
ringSlice = getRingSlice(head, tail, 2, 0)
if !bytes.Equal(ringSlice, []byte{3, 4, 5}) {
t.Error("byte comparison failed")
t.Fail()
}
ringSlice = getRingSlice(head, tail, 2, 3)
if !bytes.Equal(ringSlice, []byte{3, 4, 5, 1, 2, 3}) {
t.Error("byte comparison failed")
t.Fail()
}
startSeq = 1
p = types.PacketManifest{
IP: layers.IPv4{
SrcIP: net.IP{1, 2, 3, 4},
DstIP: net.IP{2, 3, 4, 5},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
},
TCP: layers.TCP{
Seq: startSeq,
SrcPort: 1,
DstPort: 2,
},
Payload: []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12},
}
head, tail = getOverlapRings(&p, serverFlow, conn.ClientStreamRing)
log.Printf("sequence of head %d", head.Reassembly.Seq)
log.Printf("and tail %d", tail.Reassembly.Seq)
ringSlice = getRingSlice(head, tail, 0, 2)
if !bytes.Equal(ringSlice, []byte{1, 2, 3, 4, 5, 1, 2}) {
t.Errorf("ringSlice is %x\n", ringSlice)
t.Fail()
}
ringSlice = getRingSlice(head, tail, 2, 4)
if !bytes.Equal(ringSlice, []byte{3, 4, 5, 1, 2, 3, 4}) {
t.Errorf("ringSlice is %x\n", ringSlice) //XXX
t.Fail()
}
}