1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
#include <doctest/doctest.h>
#include <pcap.h>
#include <string_view>
#include <vector>
#include "packeteer/summarize.hpp"
namespace {
// Ethernet + IPv4 + UDP + DNS query for "example.com", assembled the
// same way the real capture path hands bytes to summarize_packet: one
// contiguous frame, no struct-casting.
std::vector<unsigned char> ethernet_ipv4_udp_dns_frame() {
std::vector<unsigned char> dns = {
0x12, 0x9d, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
0x00, 0x01, 0x00, 0x01,
};
std::vector<unsigned char> udp(8, 0);
udp[0] = 0xD4; udp[1] = 0x31; // src port 54321
udp[2] = 0x00; udp[3] = 0x35; // dst port 53
std::uint16_t udp_len = static_cast<std::uint16_t>(8 + dns.size());
udp[4] = static_cast<unsigned char>(udp_len >> 8);
udp[5] = static_cast<unsigned char>(udp_len & 0xFF);
std::vector<unsigned char> ip(20, 0);
ip[0] = 0x45;
ip[8] = 64; // ttl
ip[9] = packeteer::net::kProtoUdp; // proto
ip[12] = 10; ip[13] = 0; ip[14] = 0; ip[15] = 1; // src 10.0.0.1
ip[16] = 10; ip[17] = 0; ip[18] = 0; ip[19] = 2; // dst 10.0.0.2
std::vector<unsigned char> eth = {
0x11, 0x22, 0x33, 0x44, 0x55, 0x66, // dst mac
0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, // src mac
0x08, 0x00, // ethertype IPv4
};
std::vector<unsigned char> frame = eth;
frame.insert(frame.end(), ip.begin(), ip.end());
frame.insert(frame.end(), udp.begin(), udp.end());
frame.insert(frame.end(), dns.begin(), dns.end());
return frame;
}
// Ethernet + IPv4 + TCP + an HTTP GET request. This is the only test
// exercising L7Registry's TCP-payload path with a real registered
// dissector - DNS only ever runs over UDP, so summarize_packet's TCP
// branch calling into l7_summarize() was otherwise unverified.
std::vector<unsigned char> ethernet_ipv4_tcp_http_frame() {
std::string_view request = "GET /index.html HTTP/1.1\r\nHost: example.com\r\n\r\n";
std::vector<unsigned char> http(request.begin(), request.end());
std::vector<unsigned char> tcp(20, 0);
tcp[0] = 0xC3; tcp[1] = 0x50; // src port 50000
tcp[2] = 0x00; tcp[3] = 0x50; // dst port 80
tcp[12] = 5 << 4; // data_offset = 5 (20-byte header)
tcp[13] = 0x18; // PSH | ACK
std::vector<unsigned char> ip(20, 0);
ip[0] = 0x45;
ip[8] = 64; // ttl
ip[9] = packeteer::net::kProtoTcp; // proto
ip[12] = 10; ip[13] = 0; ip[14] = 0; ip[15] = 1; // src 10.0.0.1
ip[16] = 10; ip[17] = 0; ip[18] = 0; ip[19] = 2; // dst 10.0.0.2
std::vector<unsigned char> eth = {
0x11, 0x22, 0x33, 0x44, 0x55, 0x66, // dst mac
0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, // src mac
0x08, 0x00, // ethertype IPv4
};
std::vector<unsigned char> frame = eth;
frame.insert(frame.end(), ip.begin(), ip.end());
frame.insert(frame.end(), tcp.begin(), tcp.end());
frame.insert(frame.end(), http.begin(), http.end());
return frame;
}
// Ethernet + IPv6 + a Hop-by-Hop Options extension header + TCP. Proves
// walk_ipv6_extension_headers() is actually wired into summarize_packet's
// IPv6 branch, not just unit-tested in isolation - without it, this
// packet's TCP layer (and any L7 behind it) would be silently invisible.
std::vector<unsigned char> ethernet_ipv6_hopbyhop_tcp_frame() {
std::vector<unsigned char> tcp(20, 0);
tcp[0] = 0x00; tcp[1] = 0x50; // src port 80
tcp[2] = 0x00; tcp[3] = 0x51; // dst port 81
tcp[12] = 5 << 4; // data_offset = 5
tcp[13] = 0x02; // SYN
std::vector<unsigned char> hop_by_hop = {
static_cast<unsigned char>(packeteer::net::kProtoTcp),
0x00, // hdr_ext_len = 0 -> total length (0+1)*8 = 8 bytes
0, 0, 0, 0, 0, 0, // option padding
};
std::vector<unsigned char> ip6(40, 0);
ip6[0] = 0x60; // version 6
std::uint16_t payload_len = static_cast<std::uint16_t>(hop_by_hop.size() + tcp.size());
ip6[4] = static_cast<unsigned char>(payload_len >> 8);
ip6[5] = static_cast<unsigned char>(payload_len & 0xFF);
ip6[6] = packeteer::net::kNextHeaderHopByHop;
ip6[7] = 64; // hop_limit
ip6[23] = 0x01; // src = ::1
ip6[39] = 0x01; // dst = ::1
std::vector<unsigned char> eth = {
0x11, 0x22, 0x33, 0x44, 0x55, 0x66, // dst mac
0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, // src mac
0x86, 0xDD, // ethertype IPv6
};
std::vector<unsigned char> frame = eth;
frame.insert(frame.end(), ip6.begin(), ip6.end());
frame.insert(frame.end(), hop_by_hop.begin(), hop_by_hop.end());
frame.insert(frame.end(), tcp.begin(), tcp.end());
return frame;
}
} // namespace
TEST_CASE("summarize_packet walks a Hop-by-Hop extension header to reach TCP") {
auto line = packeteer::summarize_packet(ethernet_ipv6_hopbyhop_tcp_frame(), DLT_EN10MB);
CHECK(line ==
"ETH aa:bb:cc:dd:ee:ff -> 11:22:33:44:55:66 ethertype=0x86dd"
" | IPv6 ::1 -> ::1 ttl=64 proto=6"
" | TCP 80 -> 81 [S] seq=0 ack=0 win=0");
}
TEST_CASE("summarize_packet decodes a full Ethernet/IPv4/TCP/HTTP frame end to end") {
auto line = packeteer::summarize_packet(ethernet_ipv4_tcp_http_frame(), DLT_EN10MB);
CHECK(line ==
"ETH aa:bb:cc:dd:ee:ff -> 11:22:33:44:55:66 ethertype=0x0800"
" | IPv4 10.0.0.1 -> 10.0.0.2 ttl=64 proto=6"
" | TCP 50000 -> 80 [AP] seq=0 ack=0 win=0"
" | HTTP GET /index.html Host: example.com");
}
TEST_CASE("summarize_packet decodes a full Ethernet/IPv4/UDP/DNS frame end to end") {
auto line = packeteer::summarize_packet(ethernet_ipv4_udp_dns_frame(), DLT_EN10MB);
CHECK(line ==
"ETH aa:bb:cc:dd:ee:ff -> 11:22:33:44:55:66 ethertype=0x0800"
" | IPv4 10.0.0.1 -> 10.0.0.2 ttl=64 proto=17"
" | UDP 54321 -> 53 len=37"
" | DNS query id=4765 example.com type=1");
}
TEST_CASE("summarize_packet on DLT_RAW skips the Ethernet line entirely") {
auto frame = ethernet_ipv4_udp_dns_frame();
std::vector<unsigned char> raw(frame.begin() + packeteer::net::kEthernetHeaderLen, frame.end());
auto line = packeteer::summarize_packet(raw, DLT_RAW);
CHECK(line.substr(0, 3) == "RAW");
CHECK(line.find("ETH") == std::string::npos);
CHECK(line.find("IPv4 10.0.0.1 -> 10.0.0.2") != std::string::npos);
}
TEST_CASE("summarize_packet reports a truncated Ethernet frame without decoding further") {
std::vector<unsigned char> bytes(10, 0); // shorter than the 14-byte header
auto line = packeteer::summarize_packet(bytes, DLT_EN10MB);
CHECK(line == "[10 bytes] truncated ethernet frame");
}
TEST_CASE("summarize_packet stops after the Ethernet line for a non-IP ethertype") {
std::vector<unsigned char> bytes = {
0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF,
0x08, 0x06, // ARP, not IPv4/IPv6
};
auto line = packeteer::summarize_packet(bytes, DLT_EN10MB);
CHECK(line == "ETH aa:bb:cc:dd:ee:ff -> 11:22:33:44:55:66 ethertype=0x0806");
}
TEST_CASE("hex_dump_lines produces one line per 16 bytes, with the right byte count") {
std::vector<unsigned char> bytes(20, 0);
for (std::size_t i = 0; i < bytes.size(); ++i) bytes[i] = static_cast<unsigned char>(i);
auto lines = packeteer::hex_dump_lines(bytes);
REQUIRE(lines.size() == 2);
CHECK(lines[0].substr(0, 6) == "000000");
CHECK(lines[1].substr(0, 6) == "000010");
CHECK(lines[0].find("00 01 02 03") != std::string::npos);
CHECK(lines[0].find('|') != std::string::npos);
}
|