Merge pull request #8822 from FearlessTobi/multiplayer-fixes

network: Fixes and improvements to the room feature

src/common/announce_multiplayer_room.h

@@ -16,6 +16,7 @@ namespace AnnounceMultiplayerRoom {
 struct GameInfo {
     std::string name{""};
     u64 id{0};
+    std::string version{""};
 };
 
 struct Member {

src/core/CMakeLists.txt

@@ -2,8 +2,6 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 add_library(core STATIC
-    announce_multiplayer_session.cpp
-    announce_multiplayer_session.h
     arm/arm_interface.h
     arm/arm_interface.cpp
     arm/dynarmic/arm_dynarmic_32.cpp

src/core/core.cpp

@@ -319,10 +319,19 @@ struct System::Impl {
         if (app_loader->ReadTitle(name) != Loader::ResultStatus::Success) {
             LOG_ERROR(Core, "Failed to read title for ROM (Error {})", load_result);
         }
+
+        std::string title_version;
+        const FileSys::PatchManager pm(program_id, system.GetFileSystemController(),
+                                       system.GetContentProvider());
+        const auto metadata = pm.GetControlMetadata();
+        if (metadata.first != nullptr) {
+            title_version = metadata.first->GetVersionString();
+        }
         if (auto room_member = room_network.GetRoomMember().lock()) {
             Network::GameInfo game_info;
             game_info.name = name;
             game_info.id = program_id;
+            game_info.version = title_version;
             room_member->SendGameInfo(game_info);
         }
 

src/core/hle/service/acc/acc.cpp

@@ -534,7 +534,7 @@ public:
 
 private:
     void CheckAvailability(Kernel::HLERequestContext& ctx) {
-        LOG_WARNING(Service_ACC, "(STUBBED) called");
+        LOG_DEBUG(Service_ACC, "(STUBBED) called");
         IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(ResultSuccess);
         rb.Push(false); // TODO: Check when this is supposed to return true and when not

src/core/hle/service/ldn/ldn_types.h

@@ -113,7 +113,7 @@ enum class LinkLevel : s8 {
     Bad,
     Low,
     Good,
-    Excelent,
+    Excellent,
 };
 
 struct NodeLatestUpdate {
@@ -145,11 +145,19 @@ struct NetworkId {
 static_assert(sizeof(NetworkId) == 0x20, "NetworkId is an invalid size");
 
 struct Ssid {
-    u8 length;
-    std::array<char, SsidLengthMax + 1> raw;
+    u8 length{};
+    std::array<char, SsidLengthMax + 1> raw{};
+
+    Ssid() = default;
+
+    explicit Ssid(std::string_view data) {
+        length = static_cast<u8>(std::min(data.size(), SsidLengthMax));
+        data.copy(raw.data(), length);
+        raw[length] = 0;
+    }
 
     std::string GetStringValue() const {
-        return std::string(raw.data(), length);
+        return std::string(raw.data());
     }
 };
 static_assert(sizeof(Ssid) == 0x22, "Ssid is an invalid size");

src/core/hle/service/sockets/bsd.cpp

@@ -933,7 +933,11 @@ BSD::BSD(Core::System& system_, const char* name)
     }
 }
 
-BSD::~BSD() = default;
+BSD::~BSD() {
+    if (auto room_member = room_network.GetRoomMember().lock()) {
+        room_member->Unbind(proxy_packet_received);
+    }
+}
 
 BSDCFG::BSDCFG(Core::System& system_) : ServiceFramework{system_, "bsdcfg"} {
     // clang-format off

src/core/internal_network/socket_proxy.cpp

@@ -26,6 +26,12 @@ void ProxySocket::HandleProxyPacket(const ProxyPacket& packet) {
         closed) {
         return;
     }
+
+    if (!broadcast && packet.broadcast) {
+        LOG_INFO(Network, "Received broadcast packet, but not configured for broadcast mode");
+        return;
+    }
+
     std::lock_guard guard(packets_mutex);
     received_packets.push(packet);
 }
@@ -203,7 +209,7 @@ std::pair<s32, Errno> ProxySocket::SendTo(u32 flags, const std::vector<u8>& mess
     packet.local_endpoint = local_endpoint;
     packet.remote_endpoint = *addr;
     packet.protocol = protocol;
-    packet.broadcast = broadcast;
+    packet.broadcast = broadcast && packet.remote_endpoint.ip[3] == 255;
 
     auto& ip = local_endpoint.ip;
     auto ipv4 = Network::GetHostIPv4Address();

src/dedicated_room/CMakeLists.txt

@@ -10,7 +10,7 @@ add_executable(yuzu-room
 
 create_target_directory_groups(yuzu-room)
 
-target_link_libraries(yuzu-room PRIVATE common core network)
+target_link_libraries(yuzu-room PRIVATE common network)
 if (ENABLE_WEB_SERVICE)
     target_compile_definitions(yuzu-room PRIVATE -DENABLE_WEB_SERVICE)
     target_link_libraries(yuzu-room PRIVATE web_service)

src/dedicated_room/yuzu_room.cpp

@@ -27,8 +27,8 @@
 #include "common/scm_rev.h"
 #include "common/settings.h"
 #include "common/string_util.h"
-#include "core/announce_multiplayer_session.h"
 #include "core/core.h"
+#include "network/announce_multiplayer_session.h"
 #include "network/network.h"
 #include "network/room.h"
 #include "network/verify_user.h"
@@ -75,6 +75,12 @@ static constexpr char BanListMagic[] = "YuzuRoom-BanList-1";
 
 static constexpr char token_delimiter{':'};
 
+static void PadToken(std::string& token) {
+    while (token.size() % 4 != 0) {
+        token.push_back('=');
+    }
+}
+
 static std::string UsernameFromDisplayToken(const std::string& display_token) {
     std::size_t outlen;
 
@@ -300,6 +306,7 @@ int main(int argc, char** argv) {
         if (username.empty()) {
             LOG_INFO(Network, "Hosting a public room");
             Settings::values.web_api_url = web_api_url;
+            PadToken(token);
             Settings::values.yuzu_username = UsernameFromDisplayToken(token);
             username = Settings::values.yuzu_username.GetValue();
             Settings::values.yuzu_token = TokenFromDisplayToken(token);

src/network/CMakeLists.txt

@@ -2,6 +2,8 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 add_library(network STATIC
+    announce_multiplayer_session.cpp
+    announce_multiplayer_session.h
     network.cpp
     network.h
     packet.cpp
@@ -17,3 +19,7 @@ add_library(network STATIC
 create_target_directory_groups(network)
 
 target_link_libraries(network PRIVATE common enet Boost::boost)
+if (ENABLE_WEB_SERVICE)
+    target_compile_definitions(network PRIVATE -DENABLE_WEB_SERVICE)
+    target_link_libraries(network PRIVATE web_service)
+endif()

src/network/room.cpp

@@ -221,7 +221,7 @@ public:
      * Extracts the game name from a received ENet packet and broadcasts it.
      * @param event The ENet event that was received.
      */
-    void HandleGameNamePacket(const ENetEvent* event);
+    void HandleGameInfoPacket(const ENetEvent* event);
 
     /**
      * Removes the client from the members list if it was in it and announces the change
@@ -234,7 +234,7 @@ public:
 void Room::RoomImpl::ServerLoop() {
     while (state != State::Closed) {
         ENetEvent event;
-        if (enet_host_service(server, &event, 50) > 0) {
+        if (enet_host_service(server, &event, 5) > 0) {
             switch (event.type) {
             case ENET_EVENT_TYPE_RECEIVE:
                 switch (event.packet->data[0]) {
@@ -242,7 +242,7 @@ void Room::RoomImpl::ServerLoop() {
                     HandleJoinRequest(&event);
                     break;
                 case IdSetGameInfo:
-                    HandleGameNamePacket(&event);
+                    HandleGameInfoPacket(&event);
                     break;
                 case IdProxyPacket:
                     HandleProxyPacket(&event);
@@ -778,6 +778,7 @@ void Room::RoomImpl::BroadcastRoomInformation() {
             packet.Write(member.fake_ip);
             packet.Write(member.game_info.name);
             packet.Write(member.game_info.id);
+            packet.Write(member.game_info.version);
             packet.Write(member.user_data.username);
             packet.Write(member.user_data.display_name);
             packet.Write(member.user_data.avatar_url);
@@ -817,6 +818,7 @@ void Room::RoomImpl::HandleProxyPacket(const ENetEvent* event) {
     in_packet.IgnoreBytes(sizeof(u16)); // Port
 
     in_packet.IgnoreBytes(sizeof(u8)); // Protocol
+
     bool broadcast;
     in_packet.Read(broadcast); // Broadcast
 
@@ -909,7 +911,7 @@ void Room::RoomImpl::HandleChatPacket(const ENetEvent* event) {
     }
 }
 
-void Room::RoomImpl::HandleGameNamePacket(const ENetEvent* event) {
+void Room::RoomImpl::HandleGameInfoPacket(const ENetEvent* event) {
     Packet in_packet;
     in_packet.Append(event->packet->data, event->packet->dataLength);
 
@@ -917,6 +919,7 @@ void Room::RoomImpl::HandleGameNamePacket(const ENetEvent* event) {
     GameInfo game_info;
     in_packet.Read(game_info.name);
     in_packet.Read(game_info.id);
+    in_packet.Read(game_info.version);
 
     {
         std::lock_guard lock(member_mutex);
@@ -935,7 +938,8 @@ void Room::RoomImpl::HandleGameNamePacket(const ENetEvent* event) {
             if (game_info.name.empty()) {
                 LOG_INFO(Network, "{} is not playing", display_name);
             } else {
-                LOG_INFO(Network, "{} is playing {}", display_name, game_info.name);
+                LOG_INFO(Network, "{} is playing {} ({})", display_name, game_info.name,
+                         game_info.version);
             }
         }
     }

src/network/room_member.cpp

@@ -159,7 +159,7 @@ void RoomMember::RoomMemberImpl::MemberLoop() {
     while (IsConnected()) {
         std::lock_guard lock(network_mutex);
         ENetEvent event;
-        if (enet_host_service(client, &event, 100) > 0) {
+        if (enet_host_service(client, &event, 5) > 0) {
             switch (event.type) {
             case ENET_EVENT_TYPE_RECEIVE:
                 switch (event.packet->data[0]) {
@@ -315,6 +315,7 @@ void RoomMember::RoomMemberImpl::HandleRoomInformationPacket(const ENetEvent* ev
         packet.Read(member.fake_ip);
         packet.Read(member.game_info.name);
         packet.Read(member.game_info.id);
+        packet.Read(member.game_info.version);
         packet.Read(member.username);
         packet.Read(member.display_name);
         packet.Read(member.avatar_url);
@@ -622,6 +623,7 @@ void RoomMember::SendGameInfo(const GameInfo& game_info) {
     packet.Write(static_cast<u8>(IdSetGameInfo));
     packet.Write(game_info.name);
     packet.Write(game_info.id);
+    packet.Write(game_info.version);
     room_member_impl->Send(std::move(packet));
 }
 

src/network/room_member.h

@@ -146,7 +146,7 @@ public:
               const std::string& password = "", const std::string& token = "");
 
     /**
-     * Sends a WiFi packet to the room.
+     * Sends a Proxy packet to the room.
      * @param packet The WiFi packet to send.
      */
     void SendProxyPacket(const ProxyPacket& packet);

src/yuzu/main.cpp

@@ -860,7 +860,7 @@ void GMainWindow::InitializeWidgets() {
     });
 
     multiplayer_state = new MultiplayerState(this, game_list->GetModel(), ui->action_Leave_Room,
-                                             ui->action_Show_Room, system->GetRoomNetwork());
+                                             ui->action_Show_Room, *system);
     multiplayer_state->setVisible(false);
 
     // Create status bar

src/yuzu/multiplayer/chat_room.cpp

@@ -16,7 +16,7 @@
 #include <QUrl>
 #include <QtConcurrent/QtConcurrentRun>
 #include "common/logging/log.h"
-#include "core/announce_multiplayer_session.h"
+#include "network/announce_multiplayer_session.h"
 #include "ui_chat_room.h"
 #include "yuzu/game_list_p.h"
 #include "yuzu/multiplayer/chat_room.h"
@@ -122,19 +122,22 @@ public:
     static const int UsernameRole = Qt::UserRole + 2;
     static const int AvatarUrlRole = Qt::UserRole + 3;
     static const int GameNameRole = Qt::UserRole + 4;
+    static const int GameVersionRole = Qt::UserRole + 5;
 
     PlayerListItem() = default;
     explicit PlayerListItem(const std::string& nickname, const std::string& username,
-                            const std::string& avatar_url, const std::string& game_name) {
+                            const std::string& avatar_url,
+                            const AnnounceMultiplayerRoom::GameInfo& game_info) {
         setEditable(false);
         setData(QString::fromStdString(nickname), NicknameRole);
         setData(QString::fromStdString(username), UsernameRole);
         setData(QString::fromStdString(avatar_url), AvatarUrlRole);
-        if (game_name.empty()) {
+        if (game_info.name.empty()) {
             setData(QObject::tr("Not playing a game"), GameNameRole);
         } else {
-            setData(QString::fromStdString(game_name), GameNameRole);
+            setData(QString::fromStdString(game_info.name), GameNameRole);
         }
+        setData(QString::fromStdString(game_info.version), GameVersionRole);
     }
 
     QVariant data(int role) const override {
@@ -149,7 +152,13 @@ public:
         } else {
             name = QStringLiteral("%1 (%2)").arg(nickname, username);
         }
-        return QStringLiteral("%1\n      %2").arg(name, data(GameNameRole).toString());
+        const QString version = data(GameVersionRole).toString();
+        QString version_string;
+        if (!version.isEmpty()) {
+            version_string = QStringLiteral("(%1)").arg(version);
+        }
+        return QStringLiteral("%1\n      %2 %3")
+            .arg(name, data(GameNameRole).toString(), version_string);
     }
 };
 
@@ -167,6 +176,10 @@ ChatRoom::ChatRoom(QWidget* parent) : QWidget(parent), ui(std::make_unique<Ui::C
 
     ui->chat_history->document()->setMaximumBlockCount(max_chat_lines);
 
+    auto font = ui->chat_history->font();
+    font.setPointSizeF(10);
+    ui->chat_history->setFont(font);
+
     // register the network structs to use in slots and signals
     qRegisterMetaType<Network::ChatEntry>();
     qRegisterMetaType<Network::StatusMessageEntry>();
@@ -366,7 +379,7 @@ void ChatRoom::SetPlayerList(const Network::RoomMember::MemberList& member_list)
         if (member.nickname.empty())
             continue;
         QStandardItem* name_item = new PlayerListItem(member.nickname, member.username,
-                                                      member.avatar_url, member.game_info.name);
+                                                      member.avatar_url, member.game_info);
 
 #ifdef ENABLE_WEB_SERVICE
         if (!icon_cache.count(member.avatar_url) && !member.avatar_url.empty()) {

src/yuzu/multiplayer/client_room.cpp

@@ -10,7 +10,7 @@
 #include <QTime>
 #include <QtConcurrent/QtConcurrentRun>
 #include "common/logging/log.h"
-#include "core/announce_multiplayer_session.h"
+#include "network/announce_multiplayer_session.h"
 #include "ui_client_room.h"
 #include "yuzu/game_list_p.h"
 #include "yuzu/multiplayer/client_room.h"

src/yuzu/multiplayer/direct_connect.cpp

@@ -8,6 +8,8 @@
 #include <QString>
 #include <QtConcurrent/QtConcurrentRun>
 #include "common/settings.h"
+#include "core/core.h"
+#include "core/internal_network/network_interface.h"
 #include "network/network.h"
 #include "ui_direct_connect.h"
 #include "yuzu/main.h"
@@ -20,9 +22,10 @@
 
 enum class ConnectionType : u8 { TraversalServer, IP };
 
-DirectConnectWindow::DirectConnectWindow(Network::RoomNetwork& room_network_, QWidget* parent)
+DirectConnectWindow::DirectConnectWindow(Core::System& system_, QWidget* parent)
     : QDialog(parent, Qt::WindowTitleHint | Qt::WindowCloseButtonHint | Qt::WindowSystemMenuHint),
-      ui(std::make_unique<Ui::DirectConnect>()), room_network{room_network_} {
+      ui(std::make_unique<Ui::DirectConnect>()), system{system_}, room_network{
+                                                                      system.GetRoomNetwork()} {
 
     ui->setupUi(this);
 
@@ -53,10 +56,20 @@ void DirectConnectWindow::RetranslateUi() {
 }
 
 void DirectConnectWindow::Connect() {
+    if (!Network::GetSelectedNetworkInterface()) {
+        NetworkMessage::ErrorManager::ShowError(
+            NetworkMessage::ErrorManager::NO_INTERFACE_SELECTED);
+        return;
+    }
     if (!ui->nickname->hasAcceptableInput()) {
         NetworkMessage::ErrorManager::ShowError(NetworkMessage::ErrorManager::USERNAME_NOT_VALID);
         return;
     }
+    if (system.IsPoweredOn()) {
+        if (!NetworkMessage::WarnGameRunning()) {
+            return;
+        }
+    }
     if (const auto member = room_network.GetRoomMember().lock()) {
         // Prevent the user from trying to join a room while they are already joining.
         if (member->GetState() == Network::RoomMember::State::Joining) {

src/yuzu/multiplayer/direct_connect.h

@@ -12,11 +12,15 @@ namespace Ui {
 class DirectConnect;
 }
 
+namespace Core {
+class System;
+}
+
 class DirectConnectWindow : public QDialog {
     Q_OBJECT
 
 public:
-    explicit DirectConnectWindow(Network::RoomNetwork& room_network_, QWidget* parent = nullptr);
+    explicit DirectConnectWindow(Core::System& system_, QWidget* parent = nullptr);
     ~DirectConnectWindow();
 
     void RetranslateUi();
@@ -39,5 +43,6 @@ private:
     QFutureWatcher<void>* watcher;
     std::unique_ptr<Ui::DirectConnect> ui;
     Validation validation;
+    Core::System& system;
     Network::RoomNetwork& room_network;
 };

src/yuzu/multiplayer/host_room.cpp

@@ -12,7 +12,9 @@
 #include <QtConcurrent/QtConcurrentRun>
 #include "common/logging/log.h"
 #include "common/settings.h"
-#include "core/announce_multiplayer_session.h"
+#include "core/core.h"
+#include "core/internal_network/network_interface.h"
+#include "network/announce_multiplayer_session.h"
 #include "ui_host_room.h"
 #include "yuzu/game_list_p.h"
 #include "yuzu/main.h"
@@ -27,10 +29,11 @@
 
 HostRoomWindow::HostRoomWindow(QWidget* parent, QStandardItemModel* list,
                                std::shared_ptr<Core::AnnounceMultiplayerSession> session,
-                               Network::RoomNetwork& room_network_)
+                               Core::System& system_)
     : QDialog(parent, Qt::WindowTitleHint | Qt::WindowCloseButtonHint | Qt::WindowSystemMenuHint),
       ui(std::make_unique<Ui::HostRoom>()),
-      announce_multiplayer_session(session), room_network{room_network_} {
+      announce_multiplayer_session(session), system{system_}, room_network{
+                                                                  system.GetRoomNetwork()} {
     ui->setupUi(this);
 
     // set up validation for all of the fields
@@ -105,6 +108,11 @@ std::unique_ptr<Network::VerifyUser::Backend> HostRoomWindow::CreateVerifyBacken
 }
 
 void HostRoomWindow::Host() {
+    if (!Network::GetSelectedNetworkInterface()) {
+        NetworkMessage::ErrorManager::ShowError(
+            NetworkMessage::ErrorManager::NO_INTERFACE_SELECTED);
+        return;
+    }
     if (!ui->username->hasAcceptableInput()) {
         NetworkMessage::ErrorManager::ShowError(NetworkMessage::ErrorManager::USERNAME_NOT_VALID);
         return;
@@ -121,6 +129,11 @@ void HostRoomWindow::Host() {
         NetworkMessage::ErrorManager::ShowError(NetworkMessage::ErrorManager::GAME_NOT_SELECTED);
         return;
     }
+    if (system.IsPoweredOn()) {
+        if (!NetworkMessage::WarnGameRunning()) {
+            return;
+        }
+    }
     if (auto member = room_network.GetRoomMember().lock()) {
         if (member->GetState() == Network::RoomMember::State::Joining) {
             return;

src/yuzu/multiplayer/host_room.h

@@ -17,8 +17,9 @@ class HostRoom;
 }
 
 namespace Core {
+class System;
 class AnnounceMultiplayerSession;
-}
+} // namespace Core
 
 class ConnectionError;
 class ComboBoxProxyModel;
@@ -35,7 +36,7 @@ class HostRoomWindow : public QDialog {
 public:
     explicit HostRoomWindow(QWidget* parent, QStandardItemModel* list,
                             std::shared_ptr<Core::AnnounceMultiplayerSession> session,
-                            Network::RoomNetwork& room_network_);
+                            Core::System& system_);
     ~HostRoomWindow();
 
     /**
@@ -54,6 +55,7 @@ private:
     QStandardItemModel* game_list;
     ComboBoxProxyModel* proxy;
     Validation validation;
+    Core::System& system;
     Network::RoomNetwork& room_network;
 };
 

src/yuzu/multiplayer/lobby.cpp

@@ -6,6 +6,8 @@
 #include <QtConcurrent/QtConcurrentRun>
 #include "common/logging/log.h"
 #include "common/settings.h"
+#include "core/core.h"
+#include "core/internal_network/network_interface.h"
 #include "network/network.h"
 #include "ui_lobby.h"
 #include "yuzu/game_list_p.h"
@@ -22,11 +24,11 @@
 #endif
 
 Lobby::Lobby(QWidget* parent, QStandardItemModel* list,
-             std::shared_ptr<Core::AnnounceMultiplayerSession> session,
-             Network::RoomNetwork& room_network_)
+             std::shared_ptr<Core::AnnounceMultiplayerSession> session, Core::System& system_)
     : QDialog(parent, Qt::WindowTitleHint | Qt::WindowCloseButtonHint | Qt::WindowSystemMenuHint),
       ui(std::make_unique<Ui::Lobby>()),
-      announce_multiplayer_session(session), room_network{room_network_} {
+      announce_multiplayer_session(session), system{system_}, room_network{
+                                                                  system.GetRoomNetwork()} {
     ui->setupUi(this);
 
     // setup the watcher for background connections
@@ -114,6 +116,18 @@ void Lobby::OnExpandRoom(const QModelIndex& index) {
 }
 
 void Lobby::OnJoinRoom(const QModelIndex& source) {
+    if (!Network::GetSelectedNetworkInterface()) {
+        NetworkMessage::ErrorManager::ShowError(
+            NetworkMessage::ErrorManager::NO_INTERFACE_SELECTED);
+        return;
+    }
+
+    if (system.IsPoweredOn()) {
+        if (!NetworkMessage::WarnGameRunning()) {
+            return;
+        }
+    }
+
     if (const auto member = room_network.GetRoomMember().lock()) {
         // Prevent the user from trying to join a room while they are already joining.
         if (member->GetState() == Network::RoomMember::State::Joining) {

src/yuzu/multiplayer/lobby.h

@@ -9,7 +9,7 @@
 #include <QSortFilterProxyModel>
 #include <QStandardItemModel>
 #include "common/announce_multiplayer_room.h"
-#include "core/announce_multiplayer_session.h"
+#include "network/announce_multiplayer_session.h"
 #include "network/network.h"
 #include "yuzu/multiplayer/validation.h"
 
@@ -20,6 +20,10 @@ class Lobby;
 class LobbyModel;
 class LobbyFilterProxyModel;
 
+namespace Core {
+class System;
+}
+
 /**
  * Listing of all public games pulled from services. The lobby should be simple enough for users to
  * find the game they want to play, and join it.
@@ -30,7 +34,7 @@ class Lobby : public QDialog {
 public:
     explicit Lobby(QWidget* parent, QStandardItemModel* list,
                    std::shared_ptr<Core::AnnounceMultiplayerSession> session,
-                   Network::RoomNetwork& room_network_);
+                   Core::System& system_);
     ~Lobby() override;
 
     /**
@@ -94,6 +98,7 @@ private:
     std::weak_ptr<Core::AnnounceMultiplayerSession> announce_multiplayer_session;
     QFutureWatcher<void>* watcher;
     Validation validation;
+    Core::System& system;
     Network::RoomNetwork& room_network;
 };
 

src/yuzu/multiplayer/message.cpp

@@ -49,6 +49,9 @@ const ConnectionError ErrorManager::PERMISSION_DENIED(
     QT_TR_NOOP("You do not have enough permission to perform this action."));
 const ConnectionError ErrorManager::NO_SUCH_USER(QT_TR_NOOP(
     "The user you are trying to kick/ban could not be found.\nThey may have left the room."));
+const ConnectionError ErrorManager::NO_INTERFACE_SELECTED(
+    QT_TR_NOOP("No network interface is selected.\nPlease go to Configure -> System -> Network and "
+               "make a selection."));
 
 static bool WarnMessage(const std::string& title, const std::string& text) {
     return QMessageBox::Ok == QMessageBox::warning(nullptr, QObject::tr(title.c_str()),
@@ -60,6 +63,13 @@ void ErrorManager::ShowError(const ConnectionError& e) {
     QMessageBox::critical(nullptr, tr("Error"), tr(e.GetString().c_str()));
 }
 
+bool WarnGameRunning() {
+    return WarnMessage(
+        QT_TR_NOOP("Game already running"),
+        QT_TR_NOOP("Joining a room when the game is already running is discouraged "
+                   "and can cause the room feature not to work correctly.\nProceed anyway?"));
+}
+
 bool WarnCloseRoom() {
     return WarnMessage(
         QT_TR_NOOP("Leave Room"),

src/yuzu/multiplayer/message.h

@@ -43,11 +43,20 @@ public:
     static const ConnectionError IP_COLLISION;
     static const ConnectionError PERMISSION_DENIED;
     static const ConnectionError NO_SUCH_USER;
+    static const ConnectionError NO_INTERFACE_SELECTED;
     /**
      *  Shows a standard QMessageBox with a error message
      */
     static void ShowError(const ConnectionError& e);
 };
+
+/**
+ * Show a standard QMessageBox with a warning message about joining a room when
+ * the game is already running
+ * return true if the user wants to close the network connection
+ */
+bool WarnGameRunning();
+
 /**
  * Show a standard QMessageBox with a warning message about leaving the room
  * return true if the user wants to close the network connection

src/yuzu/multiplayer/state.cpp

@@ -8,6 +8,7 @@
 #include <QStandardItemModel>
 #include "common/announce_multiplayer_room.h"
 #include "common/logging/log.h"
+#include "core/core.h"
 #include "yuzu/game_list.h"
 #include "yuzu/multiplayer/client_room.h"
 #include "yuzu/multiplayer/direct_connect.h"
@@ -19,10 +20,9 @@
 #include "yuzu/util/clickable_label.h"
 
 MultiplayerState::MultiplayerState(QWidget* parent, QStandardItemModel* game_list_model_,
-                                   QAction* leave_room_, QAction* show_room_,
-                                   Network::RoomNetwork& room_network_)
+                                   QAction* leave_room_, QAction* show_room_, Core::System& system_)
     : QWidget(parent), game_list_model(game_list_model_), leave_room(leave_room_),
-      show_room(show_room_), room_network{room_network_} {
+      show_room(show_room_), system{system_}, room_network{system.GetRoomNetwork()} {
     if (auto member = room_network.GetRoomMember().lock()) {
         // register the network structs to use in slots and signals
         state_callback_handle = member->BindOnStateChanged(
@@ -208,15 +208,14 @@ static void BringWidgetToFront(QWidget* widget) {
 
 void MultiplayerState::OnViewLobby() {
     if (lobby == nullptr) {
-        lobby = new Lobby(this, game_list_model, announce_multiplayer_session, room_network);
+        lobby = new Lobby(this, game_list_model, announce_multiplayer_session, system);
     }
     BringWidgetToFront(lobby);
 }
 
 void MultiplayerState::OnCreateRoom() {
     if (host_room == nullptr) {
-        host_room =
-            new HostRoomWindow(this, game_list_model, announce_multiplayer_session, room_network);
+        host_room = new HostRoomWindow(this, game_list_model, announce_multiplayer_session, system);
     }
     BringWidgetToFront(host_room);
 }
@@ -279,7 +278,7 @@ void MultiplayerState::OnOpenNetworkRoom() {
 
 void MultiplayerState::OnDirectConnectToRoom() {
     if (direct_connect == nullptr) {
-        direct_connect = new DirectConnectWindow(room_network, this);
+        direct_connect = new DirectConnectWindow(system, this);
     }
     BringWidgetToFront(direct_connect);
 }

src/yuzu/multiplayer/state.h

@@ -4,7 +4,7 @@
 #pragma once
 
 #include <QWidget>
-#include "core/announce_multiplayer_session.h"
+#include "network/announce_multiplayer_session.h"
 #include "network/network.h"
 
 class QStandardItemModel;
@@ -14,12 +14,16 @@ class ClientRoomWindow;
 class DirectConnectWindow;
 class ClickableLabel;
 
+namespace Core {
+class System;
+}
+
 class MultiplayerState : public QWidget {
     Q_OBJECT;
 
 public:
     explicit MultiplayerState(QWidget* parent, QStandardItemModel* game_list, QAction* leave_room,
-                              QAction* show_room, Network::RoomNetwork& room_network_);
+                              QAction* show_room, Core::System& system_);
     ~MultiplayerState();
 
     /**
@@ -86,6 +90,7 @@ private:
     Network::RoomMember::CallbackHandle<Network::RoomMember::Error> error_callback_handle;
 
     bool show_notification = false;
+    Core::System& system;
     Network::RoomNetwork& room_network;
 };