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#include <doctest/doctest.h>
#include <array>
#include <vector>
#include "packeteer/net/igmp.hpp"
using namespace packeteer::net;
TEST_CASE("parse_igmp decodes a general membership query with an all-zero group") {
std::vector<unsigned char> bytes = {0x11, 0x64, 0x00, 0x00, 0, 0, 0, 0};
auto igmp = parse_igmp(bytes);
REQUIRE(igmp.has_value());
CHECK(igmp->type == kIgmpMembershipQuery);
REQUIRE(igmp->group.has_value());
CHECK(igmp->group->bytes == std::array<unsigned char, 4>{0, 0, 0, 0});
}
TEST_CASE("parse_igmp decodes a v2 membership report with a real group address") {
std::vector<unsigned char> bytes = {0x16, 0x00, 0x00, 0x00, 239, 255, 255, 250};
auto igmp = parse_igmp(bytes);
REQUIRE(igmp.has_value());
CHECK(igmp->type == kIgmpV2MembershipReport);
REQUIRE(igmp->group.has_value());
CHECK(igmp->group->bytes == std::array<unsigned char, 4>{239, 255, 255, 250});
}
TEST_CASE("parse_igmp rejects a payload shorter than the fixed header") {
std::vector<unsigned char> bytes(4, 0);
CHECK_FALSE(parse_igmp(bytes).has_value());
}
TEST_CASE("parse_igmp leaves group unset for a v3 report, whose bytes[4:8] aren't an address") {
// Real capture from this exact bug: bytes[4:8] here are Reserved
// (2 bytes, zero) + Number of Group Records (2 bytes, = 1) --
// reading that as an IPv4 address produced the nonsense
// "group=0.0.0.1" before this was fixed. IGMPv3's actual group
// address(es) live inside the group records that follow, which
// this dissector doesn't decode (see the header comment).
std::vector<unsigned char> bytes = {0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
auto igmp = parse_igmp(bytes);
REQUIRE(igmp.has_value());
CHECK(igmp->type == kIgmpV3MembershipReport);
CHECK_FALSE(igmp->group.has_value());
}
TEST_CASE("igmp_type_name names known types and falls back to hex for unknown ones") {
CHECK(igmp_type_name(kIgmpMembershipQuery) == "Membership Query");
CHECK(igmp_type_name(kIgmpLeaveGroup) == "Leave Group");
CHECK(igmp_type_name(0x99) == "type=0x99");
}
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