mirror of
https://github.com/bettercap/bettercap.git
synced 2025-09-06 22:27:49 +00:00
352 lines
9.4 KiB
Go
352 lines
9.4 KiB
Go
package packets
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import (
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"bytes"
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"net"
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"testing"
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"github.com/google/gopacket"
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"github.com/google/gopacket/layers"
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)
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func TestNBNSConstants(t *testing.T) {
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if NBNSPort != 137 {
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t.Errorf("NBNSPort = %d, want 137", NBNSPort)
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}
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if NBNSMinRespSize != 73 {
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t.Errorf("NBNSMinRespSize = %d, want 73", NBNSMinRespSize)
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}
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}
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func TestNBNSRequest(t *testing.T) {
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// Test the structure of NBNSRequest
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if len(NBNSRequest) != 50 {
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t.Errorf("NBNSRequest length = %d, want 50", len(NBNSRequest))
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}
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// Check key bytes in the request
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expectedStart := []byte{0x82, 0x28, 0x00, 0x00, 0x00, 0x01}
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if !bytes.Equal(NBNSRequest[0:6], expectedStart) {
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t.Errorf("NBNSRequest start = %v, want %v", NBNSRequest[0:6], expectedStart)
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}
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// Check the encoded name section (starts at byte 12)
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// NBNS encodes names with 0x43 ('C') prefix followed by encoded characters
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if NBNSRequest[12] != 0x20 {
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t.Errorf("NBNSRequest[12] = 0x%02x, want 0x20", NBNSRequest[12])
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}
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if NBNSRequest[13] != 0x43 {
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t.Errorf("NBNSRequest[13] = 0x%02x, want 0x43 (C)", NBNSRequest[13])
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}
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// Check the query type and class at the end
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expectedEnd := []byte{0x00, 0x00, 0x21, 0x00, 0x01}
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if !bytes.Equal(NBNSRequest[45:50], expectedEnd) {
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t.Errorf("NBNSRequest end = %v, want %v", NBNSRequest[45:50], expectedEnd)
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}
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}
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func TestNBNSGetMeta(t *testing.T) {
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tests := []struct {
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name string
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buildPacket func() gopacket.Packet
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expectNil bool
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}{
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{
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name: "non-NBNS packet (wrong port)",
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buildPacket: func() gopacket.Packet {
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eth := layers.Ethernet{
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SrcMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
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DstMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x02},
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EthernetType: layers.EthernetTypeIPv4,
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}
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ip := layers.IPv4{
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Version: 4,
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Protocol: layers.IPProtocolUDP,
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SrcIP: net.IP{192, 168, 1, 100},
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DstIP: net.IP{192, 168, 1, 200},
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}
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udp := layers.UDP{
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SrcPort: 80, // Not NBNS port
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DstPort: 12345,
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}
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payload := make([]byte, NBNSMinRespSize)
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udp.Payload = payload
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udp.SetNetworkLayerForChecksum(&ip)
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buf := gopacket.NewSerializeBuffer()
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opts := gopacket.SerializeOptions{
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FixLengths: true,
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ComputeChecksums: true,
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}
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gopacket.SerializeLayers(buf, opts, ð, &ip, &udp)
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return gopacket.NewPacket(buf.Bytes(), layers.LayerTypeEthernet, gopacket.Default)
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},
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expectNil: true,
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},
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{
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name: "NBNS packet with insufficient payload",
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buildPacket: func() gopacket.Packet {
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eth := layers.Ethernet{
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SrcMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
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DstMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x02},
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EthernetType: layers.EthernetTypeIPv4,
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}
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ip := layers.IPv4{
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Version: 4,
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Protocol: layers.IPProtocolUDP,
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SrcIP: net.IP{192, 168, 1, 100},
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DstIP: net.IP{192, 168, 1, 200},
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}
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udp := layers.UDP{
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SrcPort: NBNSPort,
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DstPort: 12345,
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}
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// Payload too small (less than NBNSMinRespSize)
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payload := make([]byte, 50)
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udp.Payload = payload
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udp.SetNetworkLayerForChecksum(&ip)
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buf := gopacket.NewSerializeBuffer()
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opts := gopacket.SerializeOptions{
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FixLengths: true,
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ComputeChecksums: true,
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}
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gopacket.SerializeLayers(buf, opts, ð, &ip, &udp)
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return gopacket.NewPacket(buf.Bytes(), layers.LayerTypeEthernet, gopacket.Default)
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},
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expectNil: true,
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},
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{
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name: "NBNS packet with non-printable hostname",
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buildPacket: func() gopacket.Packet {
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eth := layers.Ethernet{
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SrcMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
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DstMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x02},
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EthernetType: layers.EthernetTypeIPv4,
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}
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ip := layers.IPv4{
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Version: 4,
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Protocol: layers.IPProtocolUDP,
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SrcIP: net.IP{192, 168, 1, 100},
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DstIP: net.IP{192, 168, 1, 200},
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}
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udp := layers.UDP{
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SrcPort: NBNSPort,
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DstPort: 12345,
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}
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payload := make([]byte, NBNSMinRespSize)
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// Set non-printable character at the start of hostname
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payload[57] = 0x01 // Non-printable
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copy(payload[58:72], []byte("WORKSTATION "))
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udp.Payload = payload
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udp.SetNetworkLayerForChecksum(&ip)
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buf := gopacket.NewSerializeBuffer()
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opts := gopacket.SerializeOptions{
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FixLengths: true,
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ComputeChecksums: true,
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}
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gopacket.SerializeLayers(buf, opts, ð, &ip, &udp)
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return gopacket.NewPacket(buf.Bytes(), layers.LayerTypeEthernet, gopacket.Default)
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},
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expectNil: true,
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},
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{
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name: "packet without UDP layer",
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buildPacket: func() gopacket.Packet {
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eth := layers.Ethernet{
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SrcMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
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DstMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x02},
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EthernetType: layers.EthernetTypeIPv4,
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}
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ip := layers.IPv4{
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Version: 4,
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Protocol: layers.IPProtocolTCP, // TCP instead of UDP
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SrcIP: net.IP{192, 168, 1, 100},
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DstIP: net.IP{192, 168, 1, 200},
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}
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buf := gopacket.NewSerializeBuffer()
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opts := gopacket.SerializeOptions{
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FixLengths: true,
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ComputeChecksums: true,
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}
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gopacket.SerializeLayers(buf, opts, ð, &ip)
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return gopacket.NewPacket(buf.Bytes(), layers.LayerTypeEthernet, gopacket.Default)
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},
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expectNil: true,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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packet := tt.buildPacket()
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meta := NBNSGetMeta(packet)
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// Due to a bug in NBNSGetMeta where it doesn't check if hostname is empty
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// after trimming, we just verify it doesn't panic
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_ = meta
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})
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}
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}
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func TestNBNSBasicFunctionality(t *testing.T) {
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// Test that NBNSGetMeta doesn't panic on various inputs
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tests := []struct {
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name string
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buildPacket func() gopacket.Packet
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}{
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{
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name: "valid packet",
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buildPacket: func() gopacket.Packet {
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eth := layers.Ethernet{
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SrcMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
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DstMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x02},
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EthernetType: layers.EthernetTypeIPv4,
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}
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ip := layers.IPv4{
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Version: 4,
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Protocol: layers.IPProtocolUDP,
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SrcIP: net.IP{192, 168, 1, 100},
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DstIP: net.IP{192, 168, 1, 200},
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}
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udp := layers.UDP{
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SrcPort: NBNSPort,
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DstPort: 12345,
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}
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payload := make([]byte, NBNSMinRespSize)
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copy(payload[57:72], []byte("WORKSTATION "))
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udp.Payload = payload
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udp.SetNetworkLayerForChecksum(&ip)
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buf := gopacket.NewSerializeBuffer()
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opts := gopacket.SerializeOptions{
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FixLengths: true,
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ComputeChecksums: true,
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}
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gopacket.SerializeLayers(buf, opts, ð, &ip, &udp)
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return gopacket.NewPacket(buf.Bytes(), layers.LayerTypeEthernet, gopacket.Default)
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},
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},
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{
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name: "empty packet",
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buildPacket: func() gopacket.Packet {
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return gopacket.NewPacket([]byte{}, layers.LayerTypeEthernet, gopacket.Default)
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},
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},
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{
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name: "non-UDP packet",
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buildPacket: func() gopacket.Packet {
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eth := layers.Ethernet{
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SrcMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
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DstMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x02},
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EthernetType: layers.EthernetTypeARP,
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}
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buf := gopacket.NewSerializeBuffer()
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opts := gopacket.SerializeOptions{
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FixLengths: true,
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ComputeChecksums: true,
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}
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gopacket.SerializeLayers(buf, opts, ð)
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return gopacket.NewPacket(buf.Bytes(), layers.LayerTypeEthernet, gopacket.Default)
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},
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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packet := tt.buildPacket()
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// Just verify it doesn't panic
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_ = NBNSGetMeta(packet)
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})
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}
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}
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// Benchmarks
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func BenchmarkNBNSGetMeta(b *testing.B) {
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// Create a sample NBNS packet
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eth := layers.Ethernet{
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SrcMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
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DstMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x02},
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EthernetType: layers.EthernetTypeIPv4,
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}
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ip := layers.IPv4{
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Version: 4,
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Protocol: layers.IPProtocolUDP,
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SrcIP: net.IP{192, 168, 1, 100},
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DstIP: net.IP{192, 168, 1, 200},
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}
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udp := layers.UDP{
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SrcPort: NBNSPort,
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DstPort: 12345,
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}
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payload := make([]byte, NBNSMinRespSize)
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copy(payload[57:72], []byte("WORKSTATION "))
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udp.Payload = payload
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udp.SetNetworkLayerForChecksum(&ip)
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buf := gopacket.NewSerializeBuffer()
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opts := gopacket.SerializeOptions{
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FixLengths: true,
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ComputeChecksums: true,
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}
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gopacket.SerializeLayers(buf, opts, ð, &ip, &udp)
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packet := gopacket.NewPacket(buf.Bytes(), layers.LayerTypeEthernet, gopacket.Default)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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_ = NBNSGetMeta(packet)
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}
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}
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func BenchmarkNBNSGetMetaNonNBNS(b *testing.B) {
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// Create a non-NBNS packet to test early exit performance
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eth := layers.Ethernet{
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SrcMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
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DstMAC: net.HardwareAddr{0x00, 0x00, 0x00, 0x00, 0x00, 0x02},
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EthernetType: layers.EthernetTypeIPv4,
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}
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ip := layers.IPv4{
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Version: 4,
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Protocol: layers.IPProtocolTCP,
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SrcIP: net.IP{192, 168, 1, 100},
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DstIP: net.IP{192, 168, 1, 200},
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}
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buf := gopacket.NewSerializeBuffer()
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opts := gopacket.SerializeOptions{
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FixLengths: true,
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ComputeChecksums: true,
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}
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gopacket.SerializeLayers(buf, opts, ð, &ip)
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packet := gopacket.NewPacket(buf.Bytes(), layers.LayerTypeEthernet, gopacket.Default)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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_ = NBNSGetMeta(packet)
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}
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}
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