105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
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package packet
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import (
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"bytes"
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"net/netip"
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"testing"
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"github.com/google/gopacket/layers"
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"github.com/stretchr/testify/require"
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"golang.org/x/net/icmp"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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)
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func TestNewICMPTTLExceedPacket(t *testing.T) {
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ipv4Packet := IP{
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Src: netip.MustParseAddr("192.168.1.1"),
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Dst: netip.MustParseAddr("10.0.0.1"),
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Protocol: layers.IPProtocolICMPv4,
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TTL: 0,
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}
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icmpV4Packet := ICMP{
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IP: &ipv4Packet,
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Message: &icmp.Message{
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Type: ipv4.ICMPTypeEcho,
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Code: 0,
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Body: &icmp.Echo{
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ID: 25821,
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Seq: 58129,
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Data: []byte("test ttl=0"),
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},
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},
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}
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assertTTLExceedPacket(t, &icmpV4Packet)
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icmpV4Packet.Body = &icmp.Echo{
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ID: 3487,
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Seq: 19183,
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Data: make([]byte, ipv4MinMTU),
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}
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assertTTLExceedPacket(t, &icmpV4Packet)
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ipv6Packet := IP{
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Src: netip.MustParseAddr("fd51:2391:523:f4ee::1"),
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Dst: netip.MustParseAddr("fd51:2391:697:f4ee::2"),
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Protocol: layers.IPProtocolICMPv6,
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TTL: 0,
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}
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icmpV6Packet := ICMP{
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IP: &ipv6Packet,
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Message: &icmp.Message{
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Type: ipv6.ICMPTypeEchoRequest,
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Code: 0,
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Body: &icmp.Echo{
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ID: 25821,
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Seq: 58129,
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Data: []byte("test ttl=0"),
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},
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},
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}
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assertTTLExceedPacket(t, &icmpV6Packet)
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icmpV6Packet.Body = &icmp.Echo{
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ID: 1497,
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Seq: 39284,
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Data: make([]byte, ipv6MinMTU),
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}
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assertTTLExceedPacket(t, &icmpV6Packet)
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}
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func assertTTLExceedPacket(t *testing.T, pk *ICMP) {
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encoder := NewEncoder()
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rawPacket, err := encoder.Encode(pk)
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require.NoError(t, err)
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minMTU := ipv4MinMTU
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headerLen := ipv4MinHeaderLen
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routerIP := netip.MustParseAddr("172.16.0.3")
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if pk.Dst.Is6() {
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minMTU = ipv6MinMTU
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headerLen = ipv6HeaderLen
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routerIP = netip.MustParseAddr("fd51:2391:697:f4ee::3")
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}
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ttlExceedPacket := NewICMPTTLExceedPacket(pk.IP, rawPacket, routerIP)
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require.Equal(t, routerIP, ttlExceedPacket.Src)
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require.Equal(t, pk.Src, ttlExceedPacket.Dst)
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require.Equal(t, pk.Protocol, ttlExceedPacket.Protocol)
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require.Equal(t, DefaultTTL, ttlExceedPacket.TTL)
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timeExceed, ok := ttlExceedPacket.Body.(*icmp.TimeExceeded)
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require.True(t, ok)
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if len(rawPacket.Data) > minMTU {
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require.True(t, bytes.Equal(timeExceed.Data, rawPacket.Data[:minMTU-headerLen-icmpHeaderLen]))
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} else {
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require.True(t, bytes.Equal(timeExceed.Data, rawPacket.Data))
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}
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rawTTLExceedPacket, err := encoder.Encode(ttlExceedPacket)
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require.NoError(t, err)
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if len(rawPacket.Data) > minMTU {
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require.Len(t, rawTTLExceedPacket.Data, minMTU)
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} else {
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require.Len(t, rawTTLExceedPacket.Data, headerLen+icmpHeaderLen+len(rawPacket.Data))
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require.True(t, bytes.Equal(rawPacket.Data, rawTTLExceedPacket.Data[headerLen+icmpHeaderLen:]))
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}
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}
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