func TestPacketDot11CtrlAck(t *testing.T) {
p := gopacket.NewPacket(testPacketDot11CtrlAck, LinkTypeIEEE80211Radio, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeRadioTap, LayerTypeDot11}, t)
if got, ok := p.Layer(LayerTypeDot11).(*Dot11); ok {
if !got.ChecksumValid() {
t.Errorf("Dot11 packet processing failed:\nchecksum failed. got :\n%#v\n\n", got)
}
}
if got, ok := p.Layer(LayerTypeDot11).(*Dot11); ok {
want := &Dot11{
BaseLayer: BaseLayer{
Contents: []uint8{0xd4, 0x0, 0x0, 0x0, 0x0, 0x19, 0xe3, 0xd3, 0x53, 0x52},
Payload: []uint8{},
},
Type: Dot11TypeCtrlAck,
Proto: 0x0,
Flags: 0x0,
DurationID: 0x0,
Address1: net.HardwareAddr{0x0, 0x19, 0xe3, 0xd3, 0x53, 0x52},
Address2: net.HardwareAddr(nil),
Address3: net.HardwareAddr(nil),
Address4: net.HardwareAddr(nil),
Checksum: 0x8776e946,
}
if !reflect.DeepEqual(got, want) {
t.Errorf("Dot11 packet processing failed:\ngot :\n%#v\n\nwant :\n%#v\n\n", got, want)
}
}
}
func TestDecodeIPv6Jumbogram(t *testing.T) {
// Haven't found any of these in the wild or on example pcaps online, so had
// to generate one myself via scapy. Unfortunately, scapy can only
// str(packet) for packets with length < 65536, due to limitations in python's
// struct library, so I generated the header with:
// Ether() / IPv6(src='::1', dst='::2') / IPv6ExtHdrHopByHop(options=[Jumbo(jumboplen=70000)]) / TCP(sport=8888, dport=80)
// then added the payload manually ("payload" * 9996). The checksums here are
// not correct, but we don't check, so who cares ;)
dataStr := "\x00\x1f\xca\xb3v@$\xbe\x05'\x0b\x17\x86\xdd`\x00\x00\x00\x00\x00\x00@\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x06\x00\xc2\x04\x00\x01\x11p\"\xb8\x00P\x00\x00\x00\x00\x00\x00\x00\x00P\x02 \x00l\xd8\x00\x00"
payload := strings.Repeat("payload", 9996)
data := []byte(dataStr + payload)
p := gopacket.NewPacket(data, LinkTypeEthernet, gopacket.Default)
checkLayers(p, []gopacket.LayerType{LayerTypeEthernet, LayerTypeIPv6, LayerTypeIPv6HopByHop, LayerTypeTCP, gopacket.LayerTypePayload}, t)
if p.ApplicationLayer() == nil {
t.Error("Packet has no application layer")
} else if string(p.ApplicationLayer().Payload()) != payload {
t.Errorf("Jumbogram payload wrong")
}
// Check truncated for jumbograms
data = data[:len(data)-1]
p = gopacket.NewPacket(data, LinkTypeEthernet, gopacket.Default)
checkLayers(p, []gopacket.LayerType{LayerTypeEthernet, LayerTypeIPv6, LayerTypeIPv6HopByHop, LayerTypeTCP, gopacket.LayerTypePayload}, t)
if !p.Metadata().Truncated {
t.Error("Jumbogram should be truncated")
}
}
func TestPacketIPSecESP(t *testing.T) {
p := gopacket.NewPacket(testPacketIPSecESP, LinkTypeEthernet, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeEthernet, LayerTypeIPv4, LayerTypeIPSecESP}, t)
}
func TestPacketDot11DataARP(t *testing.T) {
p := gopacket.NewPacket(testPacketDot11DataARP, LinkTypeIEEE80211Radio, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeRadioTap, LayerTypeDot11, LayerTypeDot11Data, LayerTypeLLC, LayerTypeSNAP, LayerTypeARP}, t)
if got, ok := p.Layer(LayerTypeARP).(*ARP); ok {
want := &ARP{
BaseLayer: BaseLayer{
Contents: []uint8{0x0, 0x1, 0x8, 0x0, 0x6, 0x4, 0x0, 0x1, 0x0, 0x19, 0xe3, 0xd3, 0x53, 0x52, 0xa9, 0xfe, 0xf7, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x43, 0x8, 0xe, 0x36},
Payload: []uint8{},
},
AddrType: 0x1,
Protocol: 0x800,
HwAddressSize: 0x6,
ProtAddressSize: 0x4,
Operation: 0x1,
SourceHwAddress: []uint8{0x0, 0x19, 0xe3, 0xd3, 0x53, 0x52},
SourceProtAddress: []uint8{0xa9, 0xfe, 0xf7, 0x0},
DstHwAddress: []uint8{0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
DstProtAddress: []uint8{0x43, 0x8, 0xe, 0x36},
}
if !reflect.DeepEqual(got, want) {
t.Errorf("ARP packet processing failed:\ngot :\n%#v\n\nwant :\n%#v\n\n", got, want)
}
}
}
func TestPacketDot11DataIP(t *testing.T) {
p := gopacket.NewPacket(testPacketDot11DataIP, LinkTypeIEEE80211Radio, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeRadioTap, LayerTypeDot11, LayerTypeDot11Data, LayerTypeLLC, LayerTypeSNAP, LayerTypeIPv4, LayerTypeUDP, gopacket.LayerTypePayload}, t)
}
func BenchmarkEndpoints(b *testing.B) {
p := gopacket.NewPacket(testSimpleTCPPacket, LinkTypeEthernet, gopacket.DecodeOptions{Lazy: true, NoCopy: true})
flow := p.NetworkLayer().NetworkFlow()
for i := 0; i < b.N; i++ {
flow.Endpoints()
}
}
func getack(conn net.PacketConn, srcport layers.TCPPort, dstip string) (ack uint32, err error) {
for {
b := make([]byte, 4096)
log.Println("reading from conn")
var n int
var addr net.Addr
n, addr, err = conn.ReadFrom(b)
if err != nil {
log.Println("reading..", err)
return
} else if addr.String() == dstip {
// Decode a packet
packet := gopacket.NewPacket(b[:n], layers.LayerTypeTCP, gopacket.Default)
// Get the TCP layer from this packet
if tcpLayer := packet.Layer(layers.LayerTypeTCP); tcpLayer != nil {
tcp, _ := tcpLayer.(*layers.TCP)
if tcp.DstPort == srcport {
if tcp.SYN && tcp.ACK {
ack = tcp.Seq
} else {
err = errors.New("Port is CLOSED")
}
return
}
}
} else {
err = errors.New("Got packet not matching addr")
}
}
return
}
func TestDecodeNortelDiscovery(t *testing.T) {
// http://www.thetechfirm.com/packets/nortel_btdp/btdp_nai.enc
data := []byte{
0x01, 0x00, 0x81, 0x00, 0x01, 0x00, 0x00, 0x04, 0x38, 0xe0, 0xcc, 0xde,
0x00, 0x13, 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x81, 0x01, 0xa2, 0xac, 0x13,
0x58, 0x03, 0x00, 0x04, 0x15, 0x30, 0x0c, 0x02, 0x00, 0x00, 0x00, 0x00,
0x00, 0x04, 0x38, 0xe0, 0xcc, 0xde, 0x80, 0x6a, 0x00, 0x01, 0x14, 0x00,
0x02, 0x00, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
}
p := gopacket.NewPacket(data, LinkTypeEthernet, gopacket.Default)
wantLayers := []gopacket.LayerType{LayerTypeEthernet, LayerTypeLLC, LayerTypeSNAP, LayerTypeNortelDiscovery}
checkLayers(p, wantLayers, t)
want := &NortelDiscovery{
IPAddress: []byte{172, 19, 88, 3},
SegmentID: []byte{0x00, 0x04, 0x15},
Chassis: NDPChassisBayStack450101001000Switches,
Backplane: NDPBackplaneEthernetFastEthernetGigabitEthernet,
State: NDPStateHeartbeat,
NumLinks: 0,
}
ndpL := p.Layer(LayerTypeNortelDiscovery)
info, _ := ndpL.(*NortelDiscovery)
if !reflect.DeepEqual(info, want) {
t.Errorf("Values mismatch, \ngot %#v\nwant %#v\n", info, want)
}
}
//export go_callback
func go_callback(queueId C.int, data *C.uchar, length C.int, cb *chan NFPacket) VerdictModified {
xdata := C.GoBytes(unsafe.Pointer(data), length)
packet := gopacket.NewPacket(xdata, layers.LayerTypeIPv4, gopacket.DecodeOptions{
Lazy: true,
NoCopy: true,
SkipDecodeRecovery: false,
})
p := NFPacket{
verdictChannel: make(chan Verdict),
verdictModifiedChannel: make(chan VerdictPacket),
Packet: packet,
}
select {
case (*cb) <- p:
select {
case v := <-p.verdictModifiedChannel:
return VerdictModified{
verdict: C.uint(v.Verdict),
data: (*C.uchar)(unsafe.Pointer(&v.Packet[0])),
length: C.uint(len(v.Packet)),
}
case v := <-p.verdictChannel:
return VerdictModified{
verdict: C.uint(v),
data: nil,
length: 0,
}
}
default:
return VerdictModified{verdict: C.uint(NF_DROP), data: nil, length: 0}
}
}
func TestPacketUSB0(t *testing.T) {
p := gopacket.NewPacket(testPacketUSB0, LinkTypeLinuxUSB, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeUSB, LayerTypeUSBInterrupt}, t)
if got, ok := p.Layer(LayerTypeUSB).(*USB); ok {
want := &USB{
BaseLayer: BaseLayer{
Contents: []uint8{0x0, 0x38, 0x4a, 0x3b, 0x0, 0x88, 0xff, 0xff, 0x43, 0x1, 0x81, 0x1, 0x2, 0x0, 0x2d, 0x0, 0xc0, 0xd3, 0x5b, 0x50, 0x0, 0x0, 0x0, 0x0, 0x8a, 0x85, 0xa, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0},
Payload: []uint8{0x4},
},
ID: 0xffff88003b4a3800,
EventType: USBEventTypeComplete,
TransferType: USBTransportTypeInterrupt,
Direction: 0x1,
EndpointNumber: 0x1,
DeviceAddress: 0x1,
BusID: 0x2,
TimestampSec: 1348195264,
TimestampUsec: 689546,
Setup: false,
Data: true,
Status: 0,
UrbLength: 0x1,
UrbDataLength: 0x1,
}
if !reflect.DeepEqual(got, want) {
t.Errorf("USB packet processing failed:\ngot :\n%#v\n\nwant :\n%#v\n\n", got, want)
}
}
}
func TestICMP(t *testing.T) {
p := gopacket.NewPacket(testICMP, LinkTypeEthernet, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeEthernet, LayerTypeIPv4, LayerTypeICMPv4, gopacket.LayerTypePayload}, t)
testSerialization(t, p, testICMP)
}
func BenchmarkTCPTransportLayerFromDecodedPacket(b *testing.B) {
b.StopTimer()
p := gopacket.NewPacket(testSimpleTCPPacket, LinkTypeEthernet, gopacket.Default)
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = p.TransportLayer()
}
}
func BenchmarkFmtVerboseString(b *testing.B) {
b.StopTimer()
p := gopacket.NewPacket(testSimpleTCPPacket, LinkTypeEthernet, gopacket.Default)
b.StartTimer()
for i := 0; i < b.N; i++ {
fmt.Sprintf("%#v", p)
}
}
func TestPacketP6196(t *testing.T) {
p := gopacket.NewPacket(testPacketP6196, LinkTypeIEEE80211Radio, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeRadioTap, LayerTypeDot11, LayerTypeDot11WEP}, t)
}
func BenchmarkPacketDumpString(b *testing.B) {
b.StopTimer()
p := gopacket.NewPacket(testSimpleTCPPacket, LinkTypeEthernet, gopacket.Default)
b.StartTimer()
for i := 0; i < b.N; i++ {
p.String()
}
}
func BenchmarkTCPLayerClassFromDecodedPacket(b *testing.B) {
b.StopTimer()
p := gopacket.NewPacket(testSimpleTCPPacket, LinkTypeEthernet, gopacket.Default)
lc := gopacket.NewLayerClass([]gopacket.LayerType{LayerTypeTCP})
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = p.LayerClass(lc)
}
}
func getSerializeLayers() []gopacket.SerializableLayer {
p := gopacket.NewPacket(testSimpleTCPPacket, LinkTypeEthernet, gopacket.Default)
slayers := []gopacket.SerializableLayer{}
for _, l := range p.Layers() {
slayers = append(slayers, l.(gopacket.SerializableLayer))
}
p.Layer(LayerTypeTCP).(*TCP).SetNetworkLayerForChecksum(
p.NetworkLayer())
return slayers
}
func TestPacketICMPv6(t *testing.T) {
p := gopacket.NewPacket(testPacketICMPv6, LinkTypeEthernet, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeEthernet, LayerTypeIPv6, LayerTypeICMPv6, gopacket.LayerTypePayload}, t)
if got, ok := p.Layer(LayerTypeIPv6).(*IPv6); ok {
want := &IPv6{
BaseLayer: BaseLayer{
Contents: []byte{0x60, 0x0, 0x0, 0x0, 0x0, 0x18,
0x3a, 0xff, 0x26, 0x20, 0x0, 0x0, 0x10, 0x5, 0x0, 0x0, 0x26, 0xbe, 0x5,
0xff, 0xfe, 0x27, 0xb, 0x17, 0xfe, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0x2, 0x1f, 0xca, 0xff, 0xfe, 0xb3, 0x76, 0x40},
Payload: []byte{0x88, 0x0, 0x1e, 0xd6, 0x40, 0x0, 0x0, 0x0, 0x26, 0x20,
0x0, 0x0, 0x10, 0x5, 0x0, 0x0, 0x26, 0xbe, 0x5, 0xff, 0xfe, 0x27, 0xb,
0x17},
},
Version: 6,
TrafficClass: 0,
FlowLabel: 0,
Length: 24,
NextHeader: IPProtocolICMPv6,
HopLimit: 255,
SrcIP: net.IP{0x26, 0x20, 0x0, 0x0, 0x10, 0x5, 0x0, 0x0, 0x26, 0xbe, 0x5, 0xff, 0xfe, 0x27, 0xb, 0x17},
DstIP: net.IP{0xfe, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2, 0x1f, 0xca, 0xff, 0xfe, 0xb3, 0x76, 0x40},
}
if !reflect.DeepEqual(got, want) {
t.Errorf("IPv6 packet processing failed:\ngot :\n%#v\n\nwant :\n%#v\n\n", got, want)
}
} else {
t.Error("No IPv6 layer type found in packet")
}
if got, ok := p.Layer(LayerTypeICMPv6).(*ICMPv6); ok {
want := &ICMPv6{
BaseLayer: BaseLayer{
Contents: []byte{0x88, 0x0, 0x1e, 0xd6, 0x40, 0x0, 0x0, 0x0},
Payload: []byte{0x26, 0x20, 0x0, 0x0, 0x10,
0x5, 0x0, 0x0, 0x26, 0xbe, 0x5, 0xff, 0xfe, 0x27, 0xb, 0x17},
},
TypeCode: 0x8800,
Checksum: 0x1ed6,
TypeBytes: []byte{0x40, 0x0, 0x0, 0x0},
}
if !reflect.DeepEqual(got, want) {
t.Errorf("ICMPv6 packet processing failed:\ngot :\n%#v\n\nwant :\n%#v\n\n", got, want)
}
if got.TypeCode.String() != "NeighborAdvertisement(0)" {
t.Errorf("ICMPv6 type code, got %q want 'NeighborAdvertisement(0)'", got.TypeCode.String())
}
} else {
t.Error("No ICMPv6 layer type found in packet")
}
}
//export go_callback
func go_callback(queueId C.int, data *C.uchar, len C.int, cb *chan NFPacket) C.struct_NFResult {
xdata := C.GoBytes(unsafe.Pointer(data), len)
packet := gopacket.NewPacket(xdata, layers.LayerTypeIPv4, gopacket.DecodeOptions{Lazy: true, NoCopy: true})
p := NFPacket{resultChannel: make(chan C.struct_NFResult), Packet: packet}
select {
case (*cb) <- p:
r := <-p.resultChannel
return r
default:
return C.struct_NFResult{Verdict: C.uint(NF_DROP), Data: nil, Len: 0}
}
}
//export go_callback
func go_callback(queueId C.int, data *C.uchar, len C.int, cb *chan NFPacket) Verdict {
xdata := C.GoBytes(unsafe.Pointer(data), len)
packet := gopacket.NewPacket(xdata, layers.LayerTypeIPv4, gopacket.DecodeOptions{true, true})
p := NFPacket{verdictChannel: make(chan Verdict), Packet: packet}
select {
case (*cb) <- p:
v := <-p.verdictChannel
return v
default:
return NF_DROP
}
}
func TestDecodeUDPPacketTooSmall(t *testing.T) {
data := []byte{
0x00, 0x15, 0x2c, 0x9d, 0xcc, 0x00, 0x00, 0x10, 0xdb, 0xff, 0x10, 0x00, 0x81, 0x00, 0x01, 0xf7,
0x08, 0x00, 0x45, 0x60, 0x00, 0x3c, 0x0f, 0xa9, 0x00, 0x00, 0x6e, 0x11, 0x01, 0x0a, 0x47, 0xe6,
0xee, 0x2e, 0xac, 0x16, 0x59, 0x73, 0x00, 0x50, 0x00, 0x50, 0x00, 0x28, 0x4d, 0xad, 0x00, 0x67,
0x00, 0x01, 0x00, 0x72, 0xd5, 0xc7, 0xf1, 0x07, 0x00, 0x00, 0x01, 0x01, 0x00, 0x0d, 0x00, 0x00,
0x00, 0x14, 0x00, 0x00, 0x19, 0xba,
}
p := gopacket.NewPacket(data, LinkTypeEthernet, gopacket.Default)
checkLayers(p, []gopacket.LayerType{LayerTypeEthernet, LayerTypeDot1Q, LayerTypeIPv4, LayerTypeUDP, gopacket.LayerTypePayload}, t)
if !p.Metadata().Truncated {
t.Error("UDP short packet should be truncated")
}
}
// getHwAddr is a hacky but effective way to get the destination hardware
// address for our packets. It does an ARP request for our gateway (if there is
// one) or destination IP (if no gateway is necessary), then waits for an ARP
// reply. This is pretty slow right now, since it blocks on the ARP
// request/reply.
func (s *scanner) getHwAddr() (net.HardwareAddr, error) {
start := time.Now()
arpDst := s.dst
if s.gw != nil {
arpDst = s.gw
}
// Prepare the layers to send for an ARP request.
eth := layers.Ethernet{
SrcMAC: s.iface.HardwareAddr,
DstMAC: net.HardwareAddr{0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
EthernetType: layers.EthernetTypeARP,
}
arp := layers.ARP{
AddrType: layers.LinkTypeEthernet,
Protocol: layers.EthernetTypeIPv4,
HwAddressSize: 6,
ProtAddressSize: 4,
Operation: layers.ARPRequest,
SourceHwAddress: []byte(s.iface.HardwareAddr),
SourceProtAddress: []byte(s.src),
DstHwAddress: []byte{0, 0, 0, 0, 0, 0},
DstProtAddress: []byte(arpDst),
}
// Send a single ARP request packet (we never retry a send, since this
// is just an example ;)
if err := s.send(ð, &arp); err != nil {
return nil, err
}
// Wait 3 seconds for an ARP reply.
for {
if time.Since(start) > time.Second*3 {
return nil, fmt.Errorf("timeout getting ARP reply")
}
data, _, err := s.handle.ReadPacketData()
if err == pcap.NextErrorTimeoutExpired {
continue
} else if err != nil {
return nil, err
}
packet := gopacket.NewPacket(data, layers.LayerTypeEthernet, gopacket.NoCopy)
if arpLayer := packet.Layer(layers.LayerTypeARP); arpLayer != nil {
arp := arpLayer.(*layers.ARP)
if bytes.Equal(arp.SourceProtAddress, arpDst) {
return net.HardwareAddr(arp.SourceHwAddress), nil
}
}
}
}
// Makes sure packet payload doesn't display the 6 trailing null of this packet
// as part of the payload. They're actually the ethernet trailer.
func TestDecodeSmallTCPPacketHasEmptyPayload(t *testing.T) {
smallPacket := []byte{
0xbc, 0x30, 0x5b, 0xe8, 0xd3, 0x49, 0xb8, 0xac, 0x6f, 0x92, 0xd5, 0xbf,
0x08, 0x00, 0x45, 0x00, 0x00, 0x28, 0x00, 0x00, 0x40, 0x00, 0x40, 0x06,
0x3f, 0x9f, 0xac, 0x11, 0x51, 0xc5, 0xac, 0x11, 0x51, 0x49, 0x00, 0x63,
0x9a, 0xef, 0x00, 0x00, 0x00, 0x00, 0x2e, 0xc1, 0x27, 0x83, 0x50, 0x14,
0x00, 0x00, 0xc3, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
}
p := gopacket.NewPacket(smallPacket, LinkTypeEthernet, gopacket.Default)
if payload := p.Layer(gopacket.LayerTypePayload); payload != nil {
t.Error("Payload found for empty TCP packet")
}
testSerialization(t, p, smallPacket)
}
//Check that there is an error if the packet channel is full
func TestChannelFull(t *testing.T) {
icmpPackets := make(chan gopacket.Packet, 100)
var data []byte
data = nil
packet := gopacket.NewPacket(data, layers.LayerTypeEthernet, gopacket.Default)
var err error
err = nil
i := 0
for err == nil {
i++
err = putChannel(packet, icmpPackets)
if i > 200 {
t.Error("Channel should be full and there should be an error but there isn't.")
}
}
}
func main() {
// "106.187.99.23:1988"
var test bool
flag.StringVar(&ghost, "h", "", "tunnel server host ip")
flag.IntVar(&gport, "p", 9998, "tunnel server listen port")
flag.StringVar(&gfilter, "f", "", "tunnel pcap filter")
flag.BoolVar(&test, "t", false, "test")
flag.BoolVar(&doudp, "udp", false, "do udp nat")
flag.Parse()
gwiface, gwip, gwmac = findGateway()
log.Println("Found gateway", gwiface, gwip, gwmac)
myip, mymac = findMyIpAndMac()
log.Println("Found my ip", myip, "mac", mymac)
if test {
b, _ := ioutil.ReadFile("e.pkt")
pkt := gopacket.NewPacket(b, layers.LayerTypeEthernet, gopacket.Default)
for layer := range pkt.Layers() {
log.Println("layer", layer)
}
app := pkt.ApplicationLayer()
log.Println("app", app)
mypkt, _ := NewPkt(b)
log.Printf("oldchecksum %x %x\n", mypkt.tcp.Checksum, ^mypkt.tcp.Checksum)
log.Println("applen", len(mypkt.app))
UpdatePkt(&mypkt)
log.Println("data", len(mypkt.data))
log.Printf("newchecksum %x\n", mypkt.tcp.Checksum)
return
}
if ghost == "" {
srv := TunnelServer{}
srv.Run()
} else {
cli := TunnelClient{}
cli.Run()
}
}
func listenandcount(conn net.PacketConn, dstip string, srcport layers.TCPPort) (pkt_count, payload_size int, fullpayload []byte) {
//Drain the connection without ACKing
detected := make(map[uint32]bool) //Store the detected seq to weed out retransmits
timer := time.NewTicker(10 * time.Second)
for {
select {
case <-timer.C:
//Stop draining when channel pings first time
return
default:
b := make([]byte, 4096)
n, addr, err := conn.ReadFrom(b)
//log.Println(n)
if err != nil {
log.Println("error reading packet: ", err)
return
} else if addr.String() == dstip {
packet := gopacket.NewPacket(b[:n], layers.LayerTypeTCP, gopacket.Default)
if tcpLayer := packet.Layer(layers.LayerTypeTCP); tcpLayer != nil {
tcp, _ := tcpLayer.(*layers.TCP)
ok := detected[tcp.Seq]
if !ok {
//log.Println(packet)
if tcp.DstPort == srcport {
if payloadlayer := packet.Layer(gopacket.LayerTypePayload); payloadlayer != nil {
log.Println(tcp.Seq)
detected[tcp.Seq] = true
pkt_count++
cnt := payloadlayer.LayerContents()
fullpayload = append(fullpayload, cnt...)
//fmt.Println(string(cnt))
payload_size += len(cnt)
//log.Println(pkt_count, payload_size)
}
}
} else {
log.Println("retransmit")
}
}
}
}
}
return
}
func loadDNS(dnspacket []byte, t *testing.T) *DNS {
p := gopacket.NewPacket(dnspacket, LinkTypeEthernet, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeEthernet, LayerTypeIPv4,
LayerTypeUDP, LayerTypeDNS}, t)
dnsL := p.Layer(LayerTypeDNS)
if dnsL == nil {
t.Error("No DNS Layer found")
}
dns, ok := dnsL.(*DNS)
if !ok {
return nil
}
return dns
}
func handlePacket(p gopacket.Packet) {
ap := AP{}
// extract beacon
// extract Ssid
for _, l := range p.Layers() {
switch l.LayerType() {
case layers.LayerTypeDot11MgmtBeacon:
beacon, ok := p.Layer(layers.LayerTypeDot11MgmtBeacon).(*layers.Dot11MgmtBeacon)
if !ok {
log.Println("Could not marshal layer thing")
continue
}
pack := gopacket.NewPacket(beacon.LayerContents(), layers.LayerTypeDot11MgmtBeacon, gopacket.Default)
for _, subpack := range pack.Layers() {
info, ok := subpack.(*layers.Dot11InformationElement)
if !ok {
continue
}
if info.ID == layers.Dot11InformationElementIDSSID {
ap.Ssid = fmt.Sprintf("%s", info.Info)
break
}
}
case layers.LayerTypeDot11:
base, ok := p.Layer(layers.LayerTypeDot11).(*layers.Dot11)
if !ok {
continue
}
ap.Bssid = base.Address2
continue
case layers.LayerTypeRadioTap:
radio, ok := p.Layer(layers.LayerTypeRadioTap).(*layers.RadioTap)
if !ok {
continue
}
ap.Channel = radio.ChannelFrequency
continue
}
}
APList[ap.Ssid] = ap
}
func TestUDPPacketDNS(t *testing.T) {
p := gopacket.NewPacket(testUDPPacketDNS, LinkTypeEthernet, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeEthernet, LayerTypeIPv4, LayerTypeUDP, LayerTypeDNS}, t)
if got, ok := p.TransportLayer().(*UDP); ok {
want := &UDP{
BaseLayer: BaseLayer{
Contents: []byte{0x0, 0x35, 0x89, 0x6d, 0x0, 0xd2, 0x75, 0x4a},
Payload: []byte{0xb8, 0xd8, 0x81, 0x80, 0x0, 0x1, 0x0,
0x7, 0x0, 0x0, 0x0, 0x0, 0x4, 0x78, 0x6b, 0x63, 0x64, 0x3, 0x63, 0x6f,
0x6d, 0x0, 0x0, 0xf, 0x0, 0x1, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0,
0x2, 0x58, 0x0, 0x18, 0x0, 0x14, 0x4, 0x41, 0x4c, 0x54, 0x32, 0x5, 0x41,
0x53, 0x50, 0x4d, 0x58, 0x1, 0x4c, 0x6, 0x47, 0x4f, 0x4f, 0x47, 0x4c,
0x45, 0xc0, 0x11, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x2, 0x58, 0x0,
0x16, 0x0, 0x1e, 0x6, 0x41, 0x53, 0x50, 0x4d, 0x58, 0x32, 0xa, 0x47, 0x4f,
0x4f, 0x47, 0x4c, 0x45, 0x4d, 0x41, 0x49, 0x4c, 0xc0, 0x11, 0xc0, 0xc,
0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x2, 0x58, 0x0, 0xb, 0x0, 0x1e, 0x6, 0x41,
0x53, 0x50, 0x4d, 0x58, 0x33, 0xc0, 0x53, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1,
0x0, 0x0, 0x2, 0x58, 0x0, 0xb, 0x0, 0x1e, 0x6, 0x41, 0x53, 0x50, 0x4d,
0x58, 0x34, 0xc0, 0x53, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x2,
0x58, 0x0, 0xb, 0x0, 0x1e, 0x6, 0x41, 0x53, 0x50, 0x4d, 0x58, 0x35, 0xc0,
0x53, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x2, 0x58, 0x0, 0x4, 0x0,
0xa, 0xc0, 0x2d, 0xc0, 0xc, 0x0, 0xf, 0x0, 0x1, 0x0, 0x0, 0x2, 0x58, 0x0,
0x9, 0x0, 0x14, 0x4, 0x41, 0x4c, 0x54, 0x31, 0xc0, 0x2d},
},
SrcPort: 53,
DstPort: 35181,
Length: 210,
Checksum: 30026,
sPort: []byte{0x0, 0x35},
dPort: []byte{0x89, 0x6d},
}
if !reflect.DeepEqual(got, want) {
t.Errorf("UDP packet mismatch:\ngot :\n%#v\n\nwant :\n%#v\n\n", got, want)
}
} else {
t.Error("Transport layer packet not UDP")
}
}
func TestPacketDot11MgmtBeacon(t *testing.T) {
p := gopacket.NewPacket(testPacketDot11MgmtBeacon, LinkTypeIEEE80211Radio, gopacket.Default)
if p.ErrorLayer() != nil {
t.Error("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeRadioTap, LayerTypeDot11, LayerTypeDot11MgmtBeacon}, t)
if got, ok := p.Layer(LayerTypeRadioTap).(*RadioTap); ok {
want := &RadioTap{BaseLayer: BaseLayer{Contents: []uint8{0x0, 0x0, 0x20, 0x0, 0x67, 0x8, 0x4, 0x0, 0xe9, 0xa2, 0xfe, 0x25, 0x0, 0x0, 0x0, 0x0, 0x22, 0xc, 0xd8, 0xa0, 0x2, 0x0, 0x0, 0x0, 0x40, 0x1, 0x0, 0x0, 0x3c, 0x14, 0x24, 0x11}, Payload: []uint8{0x80, 0x0, 0x0, 0x0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0, 0x3, 0x7f, 0x7, 0xa0, 0x16, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xd0, 0x9b, 0x38, 0x40, 0x10, 0x28, 0x0, 0x0, 0x0, 0x0, 0x64, 0x0, 0x0, 0x5, 0x0, 0x0, 0x1, 0x8, 0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c, 0x3, 0x1, 0x24, 0x5, 0x4, 0x0, 0x1, 0x0, 0x0, 0x7, 0x2a, 0x55, 0x53, 0x20, 0x24, 0x1, 0x11, 0x28, 0x1, 0x11, 0x2c, 0x1, 0x11, 0x30, 0x1, 0x11, 0x34, 0x1, 0x17, 0x38, 0x1, 0x17, 0x3c, 0x1, 0x17, 0x40, 0x1, 0x17, 0x95, 0x1, 0x1e, 0x99, 0x1, 0x1e, 0x9d, 0x1, 0x1e, 0xa1, 0x1, 0x1e, 0xa5, 0x1, 0x1e, 0x20, 0x1, 0x0, 0xdd, 0x18, 0x0, 0x50, 0xf2, 0x2, 0x1, 0x1, 0x0, 0x0, 0x3, 0xa4, 0x0, 0x0, 0x27, 0xa4, 0x0, 0x0, 0x42, 0x43, 0x5e, 0x0, 0x62, 0x32, 0x2f, 0x0, 0x34, 0xc, 0x66, 0x72, 0x65, 0x65, 0x62, 0x73, 0x64, 0x2d, 0x6d, 0x65, 0x73, 0x68, 0x33, 0x17, 0x1, 0x0, 0xf, 0xac, 0x0, 0x0, 0xf, 0xac, 0x0, 0x0, 0xf, 0xac, 0xff, 0x0, 0xf, 0xac, 0xff, 0x0, 0xf, 0xac, 0xff, 0x0, 0xdf}}, Version: 0x0, Length: 0x20, Present: 0x40867, TSFT: 0x25fea2e9, Flags: 0x22, Rate: 0xc, ChannelFrequency: 0x0, ChannelFlags: 0x0, FHSS: 0x0, DBMAntennaSignal: -40, DBMAntennaNoise: -96, LockQuality: 0x0, TxAttenuation: 0x0, DBTxAttenuation: 0x0, DBMTxPower: 0, Antenna: 0x2, DBAntennaSignal: 0x0, DBAntennaNoise: 0x0}
if !reflect.DeepEqual(got, want) {
t.Errorf("RadioTap packet processing failed:\ngot :\n%#v\n\nwant :\n%#v\n\n", got, want)
}
}
if got, ok := p.Layer(LayerTypeDot11).(*Dot11); ok {
want := &Dot11{
BaseLayer: BaseLayer{
Contents: []uint8{0x80, 0x0, 0x0, 0x0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x0, 0x3, 0x7f, 0x7, 0xa0, 0x16, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xd0, 0x9b},
Payload: []uint8{0x38, 0x40, 0x10, 0x28, 0x0, 0x0, 0x0, 0x0, 0x64, 0x0, 0x0, 0x5, 0x0, 0x0, 0x1, 0x8, 0x8c, 0x12, 0x98, 0x24, 0xb0, 0x48, 0x60, 0x6c, 0x3, 0x1, 0x24, 0x5, 0x4, 0x0, 0x1, 0x0, 0x0, 0x7, 0x2a, 0x55, 0x53, 0x20, 0x24, 0x1, 0x11, 0x28, 0x1, 0x11, 0x2c, 0x1, 0x11, 0x30, 0x1, 0x11, 0x34, 0x1, 0x17, 0x38, 0x1, 0x17, 0x3c, 0x1, 0x17, 0x40, 0x1, 0x17, 0x95, 0x1, 0x1e, 0x99, 0x1, 0x1e, 0x9d, 0x1, 0x1e, 0xa1, 0x1, 0x1e, 0xa5, 0x1, 0x1e, 0x20, 0x1, 0x0, 0xdd, 0x18, 0x0, 0x50, 0xf2, 0x2, 0x1, 0x1, 0x0, 0x0, 0x3, 0xa4, 0x0, 0x0, 0x27, 0xa4, 0x0, 0x0, 0x42, 0x43, 0x5e, 0x0, 0x62, 0x32, 0x2f, 0x0, 0x34, 0xc, 0x66, 0x72, 0x65, 0x65, 0x62, 0x73, 0x64, 0x2d, 0x6d, 0x65, 0x73, 0x68, 0x33, 0x17, 0x1, 0x0, 0xf, 0xac, 0x0, 0x0, 0xf, 0xac, 0x0, 0x0, 0xf, 0xac, 0xff, 0x0, 0xf, 0xac, 0xff, 0x0, 0xf},
},
Type: Dot11TypeMgmtBeacon,
Proto: 0x0,
Flags: 0x0,
DurationID: 0x0,
Address1: net.HardwareAddr{0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
Address2: net.HardwareAddr{0x0, 0x3, 0x7f, 0x7, 0xa0, 0x16},
Address3: net.HardwareAddr{0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
Address4: net.HardwareAddr(nil),
SequenceNumber: 0x9bd, FragmentNumber: 0x0,
Checksum: 0xdf00ffac,
}
if !reflect.DeepEqual(got, want) {
t.Errorf("Dot11 packet processing failed:\ngot :\n%#v\n\nwant :\n%#v\n\n", got, want)
}
}
}