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#include <doctest/doctest.h>
#include <vector>
#include "packeteer/l7/mdns.hpp"
using namespace packeteer::net;
namespace {
// A typical mDNS query for a ".local" hostname, id=0 per RFC 6762
// 18.1's convention for multicast queries.
std::vector<unsigned char> mdns_query() {
return {
0x00, 0x00, // id = 0
0x00, 0x00, // flags: query
0x00, 0x01, // qdcount = 1
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
6, 'm', 'y', 'h', 'o', 's', 't', 5, 'l', 'o', 'c', 'a', 'l', 0,
0x00, 0x01, // qtype = A
0x00, 0x01, // qclass = IN
};
}
} // namespace
TEST_CASE("MdnsDissector claims port 5353") {
MdnsDissector dissector;
CHECK(dissector.port() == kMdnsPort);
}
TEST_CASE("MdnsDissector summarizes a query without an id= field") {
MdnsDissector dissector;
auto summary = dissector.summarize(mdns_query());
REQUIRE(summary.has_value());
CHECK(summary->substr(0, 10) == "mDNS query");
CHECK(summary->find("myhost.local") != std::string::npos);
CHECK(summary->find("id=") == std::string::npos);
}
TEST_CASE("MdnsDissector summarizes a response with ancount") {
MdnsDissector dissector;
std::vector<unsigned char> bytes = {
0x00, 0x00,
0x84, 0x00, // flags: QR=1 (response), AA=1
0x00, 0x00, // qdcount = 0 (typical for an mDNS response)
0x00, 0x01, // ancount = 1
0x00, 0x00, 0x00, 0x00,
};
auto summary = dissector.summarize(bytes);
REQUIRE(summary.has_value());
CHECK(summary->substr(0, 13) == "mDNS response");
CHECK(summary->find("ancount=1") != std::string::npos);
}
TEST_CASE("MdnsDissector::summarize returns nullopt for a truncated payload") {
MdnsDissector dissector;
std::vector<unsigned char> bytes(5, 0);
CHECK_FALSE(dissector.summarize(bytes).has_value());
}
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