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packetStructure_test.go
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packetStructure_test.go
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package main
import (
"bytes"
"encoding/hex"
"log"
"net"
"reflect"
"strconv"
"testing"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
)
// TestInitEmptyPacketStructure tests the initialization of the empty packet structure.
func TestInitEmptyPacketStructure(t *testing.T) {
InitEmptyPacketStructure()
// Check main fields from ethernet layer
if !bytes.Equal(ethernetLayer.DstMAC, net.HardwareAddr{}) {
t.Error("Expected:", net.HardwareAddr{}, "Got:", ethernetLayer.DstMAC)
}
if !bytes.Equal(ethernetLayer.SrcMAC, net.HardwareAddr{}) {
t.Error("Expected:", net.HardwareAddr{}, "Got:", ethernetLayer.SrcMAC)
}
if ethernetLayer.EthernetType != 0 {
t.Error("Expected:", 0, "Got:", ethernetLayer.EthernetType)
}
if ethernetLayer.Length != 0 {
t.Error("Expected:", 0, "Got:", ethernetLayer.Length)
}
// Check main fields from ip layer
if !bytes.Equal(ipLayer.DstIP, net.IP{}) {
t.Error("Expected:", net.IP{}, "Got:", ipLayer.DstIP)
}
if !bytes.Equal(ipLayer.SrcIP, net.IP{}) {
t.Error("Expected:", net.IP{}, "Got:", ipLayer.SrcIP)
}
if ipLayer.Length != 0 {
t.Error("Expected:", 0, "Got:", ipLayer.Length)
}
if ipLayer.TTL != 0 {
t.Error("Expected:", 0, "Got:", ipLayer.TTL)
}
if ipLayer.TOS != 0 {
t.Error("Expected:", 0, "Got:", ipLayer.TOS)
}
if ipLayer.Version != 0 {
t.Error("Expected:", 0, "Got:", ipLayer.Version)
}
if ipLayer.Protocol != 0 {
t.Error("Expected:", 0, "Got:", ipLayer.Protocol)
}
if ipLayer.Options != nil {
t.Error("Expected:", nil, "Got:", ipLayer.Options)
}
// Check main fields from udp layer
if udpLayer.DstPort != 0 {
t.Error("Expected:", 0, "Got:", udpLayer.DstPort)
}
if udpLayer.SrcPort != 0 {
t.Error("Expected:", 0, "Got:", udpLayer.SrcPort)
}
if udpLayer.Length != 0 {
t.Error("Expected:", 0, "Got:", udpLayer.Length)
}
if udpLayer.Checksum != 0 {
t.Error("Expected:", 0, "Got:", udpLayer.Checksum)
}
}
type InitBasePacketTestStruct struct {
targetIP net.IP
localIP net.IP
targetMACAddr net.HardwareAddr
localMACAddr net.HardwareAddr
targetPort uint
localPort uint
}
// TestInitBasePacketStructure tests the initialization of the base packet layers without shimlayer.
func TestInitBasePacketStructure(t *testing.T) {
var testcases = []InitBasePacketTestStruct{
{net.IP{192, 168, 181, 133}, net.IP{192, 168, 181, 132}, net.HardwareAddr{0x00, 0x0c, 0x29, 0xec, 0x31, 0xfa}, net.HardwareAddr{0x00, 0x0c, 0x29, 0xc7, 0x6d, 0xb9}, 9999, 10000},
}
for _, testcase := range testcases {
InitBasePacketStructure(testcase.targetIP, testcase.localIP, testcase.targetMACAddr, testcase.localMACAddr, testcase.targetPort, testcase.localPort)
// Check main fields from ethernet layer
if !bytes.Equal(ethernetLayer.DstMAC, testcase.targetMACAddr) {
t.Error("Expected:", testcase.targetMACAddr, "Got:", ethernetLayer.DstMAC)
}
if !bytes.Equal(ethernetLayer.SrcMAC, testcase.localMACAddr) {
t.Error("Expected:", testcase.localMACAddr, "Got:", ethernetLayer.SrcMAC)
}
if ethernetLayer.EthernetType != layers.EthernetTypeIPv4 {
t.Error("Expected:", layers.EthernetTypeIPv4, "Got:", ethernetLayer.EthernetType)
}
// Check main fields from ip layer
if !bytes.Equal(ipLayer.DstIP, testcase.targetIP) {
t.Error("Expected:", testcase.targetIP, "Got:", ipLayer.DstIP)
}
if !bytes.Equal(ipLayer.SrcIP, testcase.localIP) {
t.Error("Expected:", testcase.localIP, "Got:", ipLayer.SrcIP)
}
if ipLayer.TTL != 64 {
t.Error("Expected:", 64, "Got:", ipLayer.TTL)
}
if ipLayer.TOS != 0 {
t.Error("Expected:", 0, "Got:", ipLayer.TOS)
}
if ipLayer.Version != 4 {
t.Error("Expected:", 4, "Got:", ipLayer.Version)
}
if ipLayer.Protocol != layers.IPProtocolUDP {
t.Error("Expected:", layers.IPProtocolUDP, "Got:", ipLayer.Protocol)
}
// Check main fields from udp layer
if udpLayer.DstPort != layers.UDPPort(testcase.targetPort) {
t.Error("Expected:", testcase.targetPort, "Got:", udpLayer.DstPort)
}
if udpLayer.SrcPort != layers.UDPPort(testcase.localPort) {
t.Error("Expected:", testcase.localPort, "Got:", udpLayer.SrcPort)
}
}
}
//TestInitShimLayer tests the initialization of the shimlayer.
func TestInitShimLayer(t *testing.T) {
InitShimLayer()
resultLayerType := shimLayer.LayerType()
// Check LayerType
if resultLayerType != layers.ShimLayerType {
t.Error("Expected:", layers.ShimLayerType, "Got:", resultLayerType)
}
// Check basic payload
if !bytes.Equal(*payload, []byte{0x7a, 0x68, 0x61, 0x77, 0x2d, 0x70, 0x6c, 0x75, 0x7a, 0x7a, 0x20, 0x74, 0x6f, 0x20, 0x66, 0x75, 0x7a, 0x7a, 0x20, 0x61, 0x20, 0x73, 0x68, 0x69, 0x6d, 0x20, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2d, 0x7a, 0x68, 0x61, 0x77}) {
t.Error("Expected:", []byte{0x7a, 0x68, 0x61, 0x77, 0x2d, 0x70, 0x6c, 0x75, 0x7a, 0x7a, 0x20, 0x74, 0x6f, 0x20, 0x66, 0x75, 0x7a, 0x7a, 0x20, 0x61, 0x20, 0x73, 0x68, 0x69, 0x6d, 0x20, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2d, 0x7a, 0x68, 0x61, 0x77}, "Got:", *payload)
}
}
// TestDecodePacket tests the implementation of decoding a packet.
// It uses a real pcap file from the testdata and decodes the first packet.
func TestDecodePacket(t *testing.T) {
InitEmptyPacketStructure()
InitShimLayer()
expectedEthernetPayload, err := hex.DecodeString("450000947e7340004011cf8ac0a8b584c0a8b5852710270f0080ececd8007ff0342f1403bb44df81ad3b1bd10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000065666768")
expectedIPPayload, err := hex.DecodeString("2710270f0080ececd8007ff0342f1403bb44df81ad3b1bd10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000065666768")
expectedUDPPayload, err := hex.DecodeString("d8007ff0342f1403bb44df81ad3b1bd10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000065666768")
expectedShimPayload, err := hex.DecodeString("00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000065666768")
*destIP = "192.168.181.133"
*targetPort = 9999
pcapTestFile := "testdata/plus_debug_original_trace.pcapng"
// fileHandle is the handle to the pcap file with the saved packets.
fileHandle, err := pcap.OpenOffline(pcapTestFile)
if err != nil {
log.Fatal(err)
}
// Only read the packets of the specific protocol and direction from the file.
fileHandle.SetBPFFilter("dst host " + *destIP + " and dst port " + strconv.Itoa(int(*targetPort)))
defer fileHandle.Close()
// layerValReflect represents the layer by dynamically examining the fields via reflection
layerValReflect := reflect.ValueOf(shimLayer).Elem()
packetSource := gopacket.NewPacketSource(fileHandle, fileHandle.LinkType())
packet, err := packetSource.NextPacket()
if err != nil {
t.Errorf("Error in getting Packet from PCAP file %s.\n", pcapTestFile)
}
DecodePacket(packet, &layerValReflect)
// Check main fields from ethernet layer
if !bytes.Equal(ethernetLayer.DstMAC, net.HardwareAddr{0x00, 0x0c, 0x29, 0xec, 0x31, 0xfa}) {
t.Error("Expected:", net.HardwareAddr{0x00, 0x0c, 0x29, 0xec, 0x31, 0xfa}, "Got:", ethernetLayer.DstMAC)
}
if !bytes.Equal(ethernetLayer.SrcMAC, net.HardwareAddr{0x00, 0x0c, 0x29, 0xc7, 0x6d, 0xb9}) {
t.Error("Expected:", net.HardwareAddr{0x00, 0x0c, 0x29, 0xc7, 0x6d, 0xb9}, "Got:", ethernetLayer.SrcMAC)
}
if ethernetLayer.EthernetType != layers.EthernetTypeIPv4 {
t.Error("Expected:", layers.EthernetTypeIPv4, "Got:", ethernetLayer.EthernetType)
}
if !bytes.Equal(ethernetLayer.Payload, expectedEthernetPayload) {
t.Error("Expected:", expectedEthernetPayload, "Got:", ethernetLayer.Payload)
}
// Check main fields from ip layer
if !bytes.Equal(ipLayer.DstIP, net.IP{192, 168, 181, 133}) {
t.Error("Expected:", net.IP{192, 168, 181, 133}, "Got:", ipLayer.DstIP)
}
if !bytes.Equal(ipLayer.SrcIP, net.IP{192, 168, 181, 132}) {
t.Error("Expected:", net.IP{192, 168, 181, 132}, "Got:", ipLayer.SrcIP)
}
if ipLayer.TTL != 64 {
t.Error("Expected:", 64, "Got:", ipLayer.TTL)
}
if ipLayer.IHL != 5 {
t.Error("Expected:", 5, "Got:", ipLayer.IHL)
}
if ipLayer.TOS != 0 {
t.Error("Expected:", 0, "Got:", ipLayer.TOS)
}
if ipLayer.Version != 4 {
t.Error("Expected:", 4, "Got:", ipLayer.Version)
}
if ipLayer.Checksum != 53130 {
t.Error("Expected:", 53130, "Got:", ipLayer.Checksum)
}
if ipLayer.Protocol != layers.IPProtocolUDP {
t.Error("Expected:", layers.IPProtocolUDP, "Got:", ipLayer.Protocol)
}
if ipLayer.Id != 32371 {
t.Error("Expected:", 32371, "Got:", ipLayer.Id)
}
if ipLayer.Length != 148 {
t.Error("Expected:", 148, "Got:", ipLayer.Length)
}
if ipLayer.Flags != layers.IPv4DontFragment {
t.Error("Expected:", layers.IPv4DontFragment, "Got:", ipLayer.Flags)
}
if !bytes.Equal(ipLayer.Payload, expectedIPPayload) {
t.Error("Expected:", expectedIPPayload, "Got:", ipLayer.Payload)
}
// Check main fields from udp layer
if udpLayer.DstPort != layers.UDPPort(9999) {
t.Error("Expected:", layers.UDPPort(9999), "Got:", udpLayer.DstPort)
}
if udpLayer.SrcPort != layers.UDPPort(10000) {
t.Error("Expected:", layers.UDPPort(10000), "Got:", udpLayer.SrcPort)
}
if udpLayer.Checksum != 60652 {
t.Error("Expected:", 60652, "Got:", udpLayer.Checksum)
}
if udpLayer.Length != 128 {
t.Error("Expected:", 128, "Got:", udpLayer.Length)
}
if !bytes.Equal(udpLayer.Payload, expectedUDPPayload) {
t.Error("Expected:", expectedUDPPayload, "Got:", udpLayer.Payload)
}
// Check main field from shim layer
if shimLayer.Magic.Value != 0x0d8007ff {
t.Error("Expected:", 0x0d8007ff, "Got:", shimLayer.Magic.Value)
}
if shimLayer.LFlag.Value != false {
t.Error("Expected:", 0, "Got:", shimLayer.LFlag.Value)
}
if shimLayer.RFlag.Value != false {
t.Error("Expected:", false, "Got:", shimLayer.RFlag.Value)
}
if shimLayer.SFlag.Value != false {
t.Error("Expected:", false, "Got:", shimLayer.SFlag.Value)
}
if shimLayer.XFlag.Value != false {
t.Error("Expected:", false, "Got:", shimLayer.XFlag.Value)
}
if shimLayer.CAT.Value != 3760246220136963969 {
t.Error("Expected:", 3760246220136963969, "Got:", shimLayer.CAT.Value)
}
if shimLayer.PSN.Value != 2906332113 {
t.Error("Expected:", 2906332113, "Got:", shimLayer.PSN.Value)
}
if shimLayer.PSE.Value != 0 {
t.Error("Expected:", 0, "Got:", shimLayer.PSN.Value)
}
if !bytes.Equal(*payload, expectedShimPayload) {
t.Error("Expected:", expectedShimPayload, "Got:", *payload)
}
}