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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#include <algorithm>
#include <chrono>
#include <cstring>
#include <future>
#include <mutex>
#include <thread>
#include <catch2/catch_test_macros.hpp>
#include "core/hle/service/ldn/lan_discovery.h"
#include "core/internal_network/network_interface.h"
using namespace std::chrono_literals;
namespace {
class TestLANDiscovery : public Service::LDN::LANDiscovery {
public:
void SetConnectionTimeout(std::chrono::nanoseconds timeout) {
connection_timeout = timeout;
}
std::chrono::nanoseconds GetConnectionTimeout() const {
return connection_timeout;
}
bool WaitUntilConnecting() {
const auto deadline = std::chrono::steady_clock::now() + 5s;
do {
{
std::scoped_lock lock{packet_mutex};
if (host_ip) {
// Connect has published its target and released this lock to wait for a reply.
return true;
}
}
std::this_thread::sleep_for(1ms);
} while (std::chrono::steady_clock::now() < deadline);
return false;
}
};
} // namespace
TEST_CASE("LDN waits for the selected host's connection reply", "[core][ldn]") {
using namespace Service::LDN;
if (!Network::GetSelectedNetworkInterface()) {
SKIP("LDN requires a host IPv4 interface");
}
TestLANDiscovery station;
REQUIRE(station.Initialize([] {}).IsSuccess());
REQUIRE(station.OpenStation().IsSuccess());
NetworkInfo info{};
info.network_id.session_id = {1, 2};
info.ldn.node_count = 1;
info.ldn.node_count_max = 8;
info.ldn.nodes[0].ipv4_address = {1, 0, 168, 192};
Network::LDNPacket reply{};
reply.type = Network::LDNPacketType::SyncNetwork;
reply.local_ip = {192, 168, 0, 1};
reply.data.resize(sizeof(info));
std::memcpy(reply.data.data(), &info, sizeof(info));
// A scan result or unsolicited sync must not connect an idle station.
station.ReceivePacket(reply);
REQUIRE(station.GetState() == State::StationOpened);
auto connecting = std::async(std::launch::async, [&] { return station.Connect(info, {}, 1); });
REQUIRE(station.WaitUntilConnecting());
auto unrelated = reply;
unrelated.local_ip[3] = 2;
station.ReceivePacket(unrelated);
REQUIRE(connecting.wait_for(0ms) == std::future_status::timeout);
auto stale = info;
stale.network_id.session_id.low++;
std::memcpy(unrelated.data.data(), &stale, sizeof(stale));
unrelated.local_ip = reply.local_ip;
station.ReceivePacket(unrelated);
REQUIRE(connecting.wait_for(0ms) == std::future_status::timeout);
unrelated.data.resize(1);
station.ReceivePacket(unrelated);
REQUIRE(connecting.wait_for(0ms) == std::future_status::timeout);
station.ReceivePacket(reply);
REQUIRE(connecting.wait_for(5s) == std::future_status::ready);
REQUIRE(connecting.get().IsSuccess());
REQUIRE(station.GetState() == State::StationConnected);
REQUIRE(station.Finalize().IsSuccess());
}
TEST_CASE("LDN host validates join packets and does not allocate duplicate stations",
"[core][ldn]") {
using namespace Service::LDN;
if (!Network::GetSelectedNetworkInterface()) {
SKIP("LDN requires a host IPv4 interface");
}
LANDiscovery host;
REQUIRE(host.Initialize([] {}).IsSuccess());
REQUIRE(host.OpenAccessPoint().IsSuccess());
NetworkConfig config{};
config.node_count_max = 2;
REQUIRE(host.CreateNetwork({}, {}, config).IsSuccess());
NodeInfo node{};
node.is_connected = 1;
node.mac_address.raw[5] = 1;
Network::LDNPacket request{};
request.type = Network::LDNPacketType::Connect;
request.local_ip = {192, 168, 0, 2};
request.data.resize(sizeof(node));
std::memcpy(request.data.data(), &node, sizeof(node));
host.ReceivePacket(request);
NetworkInfo info{};
REQUIRE(host.GetNetworkInfo(info).IsSuccess());
REQUIRE(info.ldn.node_count == 2);
host.ReceivePacket(request);
REQUIRE(host.GetNetworkInfo(info).IsSuccess());
REQUIRE(info.ldn.node_count == 2);
// A third console cannot enter a two-console network.
request.local_ip[3] = 3;
host.ReceivePacket(request);
REQUIRE(host.GetNetworkInfo(info).IsSuccess());
REQUIRE(info.ldn.node_count == 2);
request.type = Network::LDNPacketType::Disconnect;
request.data.resize(1);
host.ReceivePacket(request);
REQUIRE(host.GetNetworkInfo(info).IsSuccess());
REQUIRE(info.ldn.node_count == 2);
REQUIRE(host.Finalize().IsSuccess());
}
TEST_CASE("LDN reports a missing connection reply and ignores late replies", "[core][ldn]") {
using namespace Service::LDN;
if (!Network::GetSelectedNetworkInterface()) {
SKIP("LDN requires a host IPv4 interface");
}
TestLANDiscovery station;
REQUIRE(station.GetConnectionTimeout() == 5s);
station.SetConnectionTimeout(25ms);
REQUIRE(station.Initialize([] {}).IsSuccess());
REQUIRE(station.OpenStation().IsSuccess());
NetworkInfo info{};
info.ldn.node_count = 1;
info.ldn.nodes[0].ipv4_address = {1, 0, 168, 192};
REQUIRE(station.Connect(info, {}, 1) == ResultAuthenticationTimeout);
REQUIRE(station.GetState() == State::StationOpened);
Network::LDNPacket reply{};
reply.type = Network::LDNPacketType::SyncNetwork;
reply.local_ip = {192, 168, 0, 1};
reply.data.resize(sizeof(info));
std::memcpy(reply.data.data(), &info, sizeof(info));
station.ReceivePacket(reply);
REQUIRE(station.GetState() == State::StationOpened);
REQUIRE(station.Finalize().IsSuccess());
}
TEST_CASE("LDN creates fresh identities for recreated networks and separate hosts", "[core][ldn]") {
using namespace Service::LDN;
if (!Network::GetSelectedNetworkInterface()) {
SKIP("LDN requires a host IPv4 interface");
}
LANDiscovery host;
LANDiscovery other_host;
REQUIRE(host.Initialize([] {}).IsSuccess());
REQUIRE(other_host.Initialize([] {}).IsSuccess());
REQUIRE(host.OpenAccessPoint().IsSuccess());
REQUIRE(other_host.OpenAccessPoint().IsSuccess());
NetworkConfig config{};
config.node_count_max = 2;
REQUIRE(host.CreateNetwork({}, {}, config).IsSuccess());
NetworkInfo first{};
REQUIRE(host.GetNetworkInfo(first).IsSuccess());
REQUIRE(host.DestroyNetwork().IsSuccess());
REQUIRE(host.CreateNetwork({}, {}, config).IsSuccess());
NetworkInfo recreated{};
REQUIRE(host.GetNetworkInfo(recreated).IsSuccess());
REQUIRE(recreated.network_id.session_id != first.network_id.session_id);
REQUIRE(other_host.CreateNetwork({}, {}, config).IsSuccess());
NetworkInfo other{};
REQUIRE(other_host.GetNetworkInfo(other).IsSuccess());
REQUIRE(other.network_id.session_id != first.network_id.session_id);
REQUIRE(other.network_id.session_id != recreated.network_id.session_id);
REQUIRE(host.Finalize().IsSuccess());
REQUIRE(other_host.Finalize().IsSuccess());
}
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