forked from dustin/gopcap
/
decode_test.go
156 lines (153 loc) · 6.03 KB
/
decode_test.go
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package pcap
import (
"bytes"
"testing"
)
func TestDecodeSimpleTcpPacket(t *testing.T) {
p := &Packet{
Data: []byte{
0x00, 0x00, 0x0c, 0x9f, 0xf0, 0x20, 0xbc, 0x30, 0x5b, 0xe8, 0xd3, 0x49,
0x08, 0x00, 0x45, 0x00, 0x01, 0xa4, 0x39, 0xdf, 0x40, 0x00, 0x40, 0x06,
0x55, 0x5a, 0xac, 0x11, 0x51, 0x49, 0xad, 0xde, 0xfe, 0xe1, 0xc5, 0xf7,
0x00, 0x50, 0xc5, 0x7e, 0x0e, 0x48, 0x49, 0x07, 0x42, 0x32, 0x80, 0x18,
0x00, 0x73, 0xab, 0xb1, 0x00, 0x00, 0x01, 0x01, 0x08, 0x0a, 0x03, 0x77,
0x37, 0x9c, 0x42, 0x77, 0x5e, 0x3a, 0x47, 0x45, 0x54, 0x20, 0x2f, 0x20,
0x48, 0x54, 0x54, 0x50, 0x2f, 0x31, 0x2e, 0x31, 0x0d, 0x0a, 0x48, 0x6f,
0x73, 0x74, 0x3a, 0x20, 0x77, 0x77, 0x77, 0x2e, 0x66, 0x69, 0x73, 0x68,
0x2e, 0x63, 0x6f, 0x6d, 0x0d, 0x0a, 0x43, 0x6f, 0x6e, 0x6e, 0x65, 0x63,
0x74, 0x69, 0x6f, 0x6e, 0x3a, 0x20, 0x6b, 0x65, 0x65, 0x70, 0x2d, 0x61,
0x6c, 0x69, 0x76, 0x65, 0x0d, 0x0a, 0x55, 0x73, 0x65, 0x72, 0x2d, 0x41,
0x67, 0x65, 0x6e, 0x74, 0x3a, 0x20, 0x4d, 0x6f, 0x7a, 0x69, 0x6c, 0x6c,
0x61, 0x2f, 0x35, 0x2e, 0x30, 0x20, 0x28, 0x58, 0x31, 0x31, 0x3b, 0x20,
0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x78, 0x38, 0x36, 0x5f, 0x36, 0x34,
0x29, 0x20, 0x41, 0x70, 0x70, 0x6c, 0x65, 0x57, 0x65, 0x62, 0x4b, 0x69,
0x74, 0x2f, 0x35, 0x33, 0x35, 0x2e, 0x32, 0x20, 0x28, 0x4b, 0x48, 0x54,
0x4d, 0x4c, 0x2c, 0x20, 0x6c, 0x69, 0x6b, 0x65, 0x20, 0x47, 0x65, 0x63,
0x6b, 0x6f, 0x29, 0x20, 0x43, 0x68, 0x72, 0x6f, 0x6d, 0x65, 0x2f, 0x31,
0x35, 0x2e, 0x30, 0x2e, 0x38, 0x37, 0x34, 0x2e, 0x31, 0x32, 0x31, 0x20,
0x53, 0x61, 0x66, 0x61, 0x72, 0x69, 0x2f, 0x35, 0x33, 0x35, 0x2e, 0x32,
0x0d, 0x0a, 0x41, 0x63, 0x63, 0x65, 0x70, 0x74, 0x3a, 0x20, 0x74, 0x65,
0x78, 0x74, 0x2f, 0x68, 0x74, 0x6d, 0x6c, 0x2c, 0x61, 0x70, 0x70, 0x6c,
0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x78, 0x68, 0x74, 0x6d,
0x6c, 0x2b, 0x78, 0x6d, 0x6c, 0x2c, 0x61, 0x70, 0x70, 0x6c, 0x69, 0x63,
0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x78, 0x6d, 0x6c, 0x3b, 0x71, 0x3d,
0x30, 0x2e, 0x39, 0x2c, 0x2a, 0x2f, 0x2a, 0x3b, 0x71, 0x3d, 0x30, 0x2e,
0x38, 0x0d, 0x0a, 0x41, 0x63, 0x63, 0x65, 0x70, 0x74, 0x2d, 0x45, 0x6e,
0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x3a, 0x20, 0x67, 0x7a, 0x69, 0x70,
0x2c, 0x64, 0x65, 0x66, 0x6c, 0x61, 0x74, 0x65, 0x2c, 0x73, 0x64, 0x63,
0x68, 0x0d, 0x0a, 0x41, 0x63, 0x63, 0x65, 0x70, 0x74, 0x2d, 0x4c, 0x61,
0x6e, 0x67, 0x75, 0x61, 0x67, 0x65, 0x3a, 0x20, 0x65, 0x6e, 0x2d, 0x55,
0x53, 0x2c, 0x65, 0x6e, 0x3b, 0x71, 0x3d, 0x30, 0x2e, 0x38, 0x0d, 0x0a,
0x41, 0x63, 0x63, 0x65, 0x70, 0x74, 0x2d, 0x43, 0x68, 0x61, 0x72, 0x73,
0x65, 0x74, 0x3a, 0x20, 0x49, 0x53, 0x4f, 0x2d, 0x38, 0x38, 0x35, 0x39,
0x2d, 0x31, 0x2c, 0x75, 0x74, 0x66, 0x2d, 0x38, 0x3b, 0x71, 0x3d, 0x30,
0x2e, 0x37, 0x2c, 0x2a, 0x3b, 0x71, 0x3d, 0x30, 0x2e, 0x33, 0x0d, 0x0a,
0x0d, 0x0a,
}}
p.Decode()
if p.DestMac != 0x00000c9ff020 {
t.Error("Dest mac", p.DestMac)
}
if p.SrcMac != 0xbc305be8d349 {
t.Error("Src mac", p.SrcMac)
}
if len(p.Headers) != 2 {
t.Error("Incorrect number of headers", len(p.Headers))
return
}
if ip, ipOk := p.Headers[0].(*Iphdr); ipOk {
if ip.Version != 4 {
t.Error("ip Version", ip.Version)
}
if ip.Ihl != 5 {
t.Error("ip header length", ip.Ihl)
}
if ip.Tos != 0 {
t.Error("ip TOS", ip.Tos)
}
if ip.Length != 420 {
t.Error("ip Length", ip.Length)
}
if ip.Id != 14815 {
t.Error("ip ID", ip.Id)
}
if ip.Flags != 0x02 {
t.Error("ip Flags", ip.Flags)
}
if ip.FragOffset != 0 {
t.Error("ip Fragoffset", ip.FragOffset)
}
if ip.Ttl != 64 {
t.Error("ip TTL", ip.Ttl)
}
if ip.Protocol != 6 {
t.Error("ip Protocol", ip.Protocol)
}
if ip.Checksum != 0x555A {
t.Error("ip Checksum", ip.Checksum)
}
if !bytes.Equal(ip.SrcIp, []byte{172, 17, 81, 73}) {
t.Error("ip Src", ip.SrcIp)
}
if !bytes.Equal(ip.DestIp, []byte{173, 222, 254, 225}) {
t.Error("ip Dest", ip.DestIp)
}
if tcp, tcpOk := p.Headers[1].(*Tcphdr); tcpOk {
if tcp.SrcPort != 50679 {
t.Error("tcp srcport", tcp.SrcPort)
}
if tcp.DestPort != 80 {
t.Error("tcp destport", tcp.DestPort)
}
if tcp.Seq != 0xc57e0e48 {
t.Error("tcp seq", tcp.Seq)
}
if tcp.Ack != 0x49074232 {
t.Error("tcp ack", tcp.Ack)
}
if tcp.DataOffset != 8 {
t.Error("tcp dataoffset", tcp.DataOffset)
}
if tcp.Flags != 0x18 {
t.Error("tcp flags", tcp.Flags)
}
if tcp.Window != 0x73 {
t.Error("tcp window", tcp.Window)
}
if tcp.Checksum != 0xabb1 {
t.Error("tcp checksum", tcp.Checksum)
}
if tcp.Urgent != 0 {
t.Error("tcp urgent", tcp.Urgent)
}
} else {
t.Error("Second header is not TCP header")
}
} else {
t.Error("First header is not IP header")
}
if string(p.Payload) != "GET / HTTP/1.1\r\nHost: www.fish.com\r\nConnection: keep-alive\r\nUser-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Encoding: gzip,deflate,sdch\r\nAccept-Language: en-US,en;q=0.8\r\nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3\r\n\r\n" {
t.Error("--- PAYLOAD STRING ---\n", string(p.Payload), "\n--- PAYLOAD BYTES ---\n", p.Payload)
}
}
// 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) {
p := &Packet{
// This packet is only 54 bits (an empty TCP RST), thus 6 trailing null
// bytes are added by the ethernet layer to make it the minimum packet size.
Data: []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.Decode()
if p.Payload == nil {
t.Error("Nil payload")
}
if len(p.Payload) != 0 {
t.Error("Non-empty payload:", p.Payload)
}
}