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#include <doctest/doctest.h>
#include <vector>
#include "packeteer/net/arp.hpp"
using namespace packeteer::net;
namespace {
std::vector<unsigned char> arp_request() {
return {
0x00, 0x01, // hardware type = Ethernet
0x08, 0x00, // protocol type = IPv4
0x06, // hardware len = 6
0x04, // protocol len = 4
0x00, 0x01, // opcode = request
0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0x01, // sender MAC
10, 0, 0, 1, // sender IP
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // target MAC (unknown, all zero)
10, 0, 0, 2, // target IP
};
}
std::vector<unsigned char> arp_reply() {
return {
0x00, 0x01,
0x08, 0x00,
0x06,
0x04,
0x00, 0x02, // opcode = reply
0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0x02, // sender MAC (the one who was asked)
10, 0, 0, 2, // sender IP
0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0x01, // target MAC (the original requester)
10, 0, 0, 1, // target IP
};
}
} // namespace
TEST_CASE("parse_arp decodes a request with Ethernet/IPv4 addressing") {
auto arp = parse_arp(arp_request());
REQUIRE(arp.has_value());
CHECK(arp->header.opcode == kArpOpRequest);
REQUIRE(arp->sender_ip.has_value());
REQUIRE(arp->sender_mac.has_value());
REQUIRE(arp->target_ip.has_value());
CHECK(arp->sender_ip->bytes == std::array<unsigned char, 4>{10, 0, 0, 1});
CHECK(arp->target_ip->bytes == std::array<unsigned char, 4>{10, 0, 0, 2});
CHECK(arp->sender_mac->bytes == std::array<unsigned char, 6>{0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0x01});
}
TEST_CASE("parse_arp decodes a reply") {
auto arp = parse_arp(arp_reply());
REQUIRE(arp.has_value());
CHECK(arp->header.opcode == kArpOpReply);
REQUIRE(arp->sender_ip.has_value());
CHECK(arp->sender_ip->bytes == std::array<unsigned char, 4>{10, 0, 0, 2});
}
TEST_CASE("parse_arp rejects a truncated header") {
std::vector<unsigned char> bytes(5, 0);
CHECK_FALSE(parse_arp(bytes).has_value());
}
TEST_CASE("parse_arp decodes the header but skips addresses for non-Ethernet/IPv4") {
std::vector<unsigned char> bytes = {
0x00, 0x06, // hardware type = IEEE 802 (arbitrary, just not the common case)
0x08, 0x00,
0x08, // hardware len = 8, not 6
0x04,
0x00, 0x01,
};
auto arp = parse_arp(bytes);
REQUIRE(arp.has_value());
CHECK(arp->header.hardware_len == 8);
CHECK_FALSE(arp->sender_ip.has_value());
CHECK_FALSE(arp->sender_mac.has_value());
}
TEST_CASE("parse_arp treats a header claiming Ethernet/IPv4 but too short to hold it as header-only") {
std::vector<unsigned char> bytes = {
0x00, 0x01, 0x08, 0x00, 0x06, 0x04, 0x00, 0x01,
0xaa, 0xbb, 0xcc, // truncated sender MAC
};
auto arp = parse_arp(bytes);
REQUIRE(arp.has_value());
CHECK_FALSE(arp->sender_ip.has_value());
}
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