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Diffstat (limited to 'src/network/room.cpp')
| -rw-r--r-- | src/network/room.cpp | 1076 |
1 files changed, 1076 insertions, 0 deletions
diff --git a/src/network/room.cpp b/src/network/room.cpp new file mode 100644 index 000000000..b06797bf1 --- /dev/null +++ b/src/network/room.cpp @@ -0,0 +1,1076 @@ +// SPDX-FileCopyrightText: Copyright 2017 Citra Emulator Project +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <algorithm> +#include <atomic> +#include <iomanip> +#include <mutex> +#include <random> +#include <regex> +#include <shared_mutex> +#include <sstream> +#include <thread> +#include "common/logging/log.h" +#include "enet/enet.h" +#include "network/packet.h" +#include "network/room.h" +#include "network/verify_user.h" + +namespace Network { + +class Room::RoomImpl { +public: + std::mt19937 random_gen; ///< Random number generator. Used for GenerateFakeIPAddress + + ENetHost* server = nullptr; ///< Network interface. + + std::atomic<State> state{State::Closed}; ///< Current state of the room. + RoomInformation room_information; ///< Information about this room. + + std::string verify_uid; ///< A GUID which may be used for verfication. + mutable std::mutex verify_uid_mutex; ///< Mutex for verify_uid + + std::string password; ///< The password required to connect to this room. + + struct Member { + std::string nickname; ///< The nickname of the member. + GameInfo game_info; ///< The current game of the member + IPv4Address fake_ip; ///< The assigned fake ip address of the member. + /// Data of the user, often including authenticated forum username. + VerifyUser::UserData user_data; + ENetPeer* peer; ///< The remote peer. + }; + using MemberList = std::vector<Member>; + MemberList members; ///< Information about the members of this room + mutable std::shared_mutex member_mutex; ///< Mutex for locking the members list + + UsernameBanList username_ban_list; ///< List of banned usernames + IPBanList ip_ban_list; ///< List of banned IP addresses + mutable std::mutex ban_list_mutex; ///< Mutex for the ban lists + + RoomImpl() : random_gen(std::random_device()()) {} + + /// Thread that receives and dispatches network packets + std::unique_ptr<std::thread> room_thread; + + /// Verification backend of the room + std::unique_ptr<VerifyUser::Backend> verify_backend; + + /// Thread function that will receive and dispatch messages until the room is destroyed. + void ServerLoop(); + void StartLoop(); + + /** + * Parses and answers a room join request from a client. + * Validates the uniqueness of the username and assigns the MAC address + * that the client will use for the remainder of the connection. + */ + void HandleJoinRequest(const ENetEvent* event); + + /** + * Parses and answers a kick request from a client. + * Validates the permissions and that the given user exists and then kicks the member. + */ + void HandleModKickPacket(const ENetEvent* event); + + /** + * Parses and answers a ban request from a client. + * Validates the permissions and bans the user (by forum username or IP). + */ + void HandleModBanPacket(const ENetEvent* event); + + /** + * Parses and answers a unban request from a client. + * Validates the permissions and unbans the address. + */ + void HandleModUnbanPacket(const ENetEvent* event); + + /** + * Parses and answers a get ban list request from a client. + * Validates the permissions and returns the ban list. + */ + void HandleModGetBanListPacket(const ENetEvent* event); + + /** + * Returns whether the nickname is valid, ie. isn't already taken by someone else in the room. + */ + bool IsValidNickname(const std::string& nickname) const; + + /** + * Returns whether the fake ip address is valid, ie. isn't already taken by someone else in the + * room. + */ + bool IsValidFakeIPAddress(const IPv4Address& address) const; + + /** + * Returns whether a user has mod permissions. + */ + bool HasModPermission(const ENetPeer* client) const; + + /** + * Sends a ID_ROOM_IS_FULL message telling the client that the room is full. + */ + void SendRoomIsFull(ENetPeer* client); + + /** + * Sends a ID_ROOM_NAME_COLLISION message telling the client that the name is invalid. + */ + void SendNameCollision(ENetPeer* client); + + /** + * Sends a ID_ROOM_IP_COLLISION message telling the client that the IP is invalid. + */ + void SendIPCollision(ENetPeer* client); + + /** + * Sends a ID_ROOM_VERSION_MISMATCH message telling the client that the version is invalid. + */ + void SendVersionMismatch(ENetPeer* client); + + /** + * Sends a ID_ROOM_WRONG_PASSWORD message telling the client that the password is wrong. + */ + void SendWrongPassword(ENetPeer* client); + + /** + * Notifies the member that its connection attempt was successful, + * and it is now part of the room. + */ + void SendJoinSuccess(ENetPeer* client, IPv4Address fake_ip); + + /** + * Notifies the member that its connection attempt was successful, + * and it is now part of the room, and it has been granted mod permissions. + */ + void SendJoinSuccessAsMod(ENetPeer* client, IPv4Address fake_ip); + + /** + * Sends a IdHostKicked message telling the client that they have been kicked. + */ + void SendUserKicked(ENetPeer* client); + + /** + * Sends a IdHostBanned message telling the client that they have been banned. + */ + void SendUserBanned(ENetPeer* client); + + /** + * Sends a IdModPermissionDenied message telling the client that they do not have mod + * permission. + */ + void SendModPermissionDenied(ENetPeer* client); + + /** + * Sends a IdModNoSuchUser message telling the client that the given user could not be found. + */ + void SendModNoSuchUser(ENetPeer* client); + + /** + * Sends the ban list in response to a client's request for getting ban list. + */ + void SendModBanListResponse(ENetPeer* client); + + /** + * Notifies the members that the room is closed, + */ + void SendCloseMessage(); + + /** + * Sends a system message to all the connected clients. + */ + void SendStatusMessage(StatusMessageTypes type, const std::string& nickname, + const std::string& username, const std::string& ip); + + /** + * Sends the information about the room, along with the list of members + * to every connected client in the room. + * The packet has the structure: + * <MessageID>ID_ROOM_INFORMATION + * <String> room_name + * <String> room_description + * <u32> member_slots: The max number of clients allowed in this room + * <String> uid + * <u16> port + * <u32> num_members: the number of currently joined clients + * This is followed by the following three values for each member: + * <String> nickname of that member + * <IPv4Address> fake_ip of that member + * <String> game_name of that member + */ + void BroadcastRoomInformation(); + + /** + * Generates a free MAC address to assign to a new client. + * The first 3 bytes are the NintendoOUI 0x00, 0x1F, 0x32 + */ + IPv4Address GenerateFakeIPAddress(); + + /** + * Broadcasts this packet to all members except the sender. + * @param event The ENet event containing the data + */ + void HandleProxyPacket(const ENetEvent* event); + + /** + * Extracts a chat entry from a received ENet packet and adds it to the chat queue. + * @param event The ENet event that was received. + */ + void HandleChatPacket(const ENetEvent* event); + + /** + * 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); + + /** + * Removes the client from the members list if it was in it and announces the change + * to all other clients. + */ + void HandleClientDisconnection(ENetPeer* client); +}; + +// RoomImpl +void Room::RoomImpl::ServerLoop() { + while (state != State::Closed) { + ENetEvent event; + if (enet_host_service(server, &event, 50) > 0) { + switch (event.type) { + case ENET_EVENT_TYPE_RECEIVE: + switch (event.packet->data[0]) { + case IdJoinRequest: + HandleJoinRequest(&event); + break; + case IdSetGameInfo: + HandleGameNamePacket(&event); + break; + case IdProxyPacket: + HandleProxyPacket(&event); + break; + case IdChatMessage: + HandleChatPacket(&event); + break; + // Moderation + case IdModKick: + HandleModKickPacket(&event); + break; + case IdModBan: + HandleModBanPacket(&event); + break; + case IdModUnban: + HandleModUnbanPacket(&event); + break; + case IdModGetBanList: + HandleModGetBanListPacket(&event); + break; + } + enet_packet_destroy(event.packet); + break; + case ENET_EVENT_TYPE_DISCONNECT: + HandleClientDisconnection(event.peer); + break; + case ENET_EVENT_TYPE_NONE: + case ENET_EVENT_TYPE_CONNECT: + break; + } + } + } + // Close the connection to all members: + SendCloseMessage(); +} + +void Room::RoomImpl::StartLoop() { + room_thread = std::make_unique<std::thread>(&Room::RoomImpl::ServerLoop, this); +} + +void Room::RoomImpl::HandleJoinRequest(const ENetEvent* event) { + { + std::lock_guard lock(member_mutex); + if (members.size() >= room_information.member_slots) { + SendRoomIsFull(event->peer); + return; + } + } + Packet packet; + packet.Append(event->packet->data, event->packet->dataLength); + packet.IgnoreBytes(sizeof(u8)); // Ignore the message type + std::string nickname; + packet.Read(nickname); + + IPv4Address preferred_fake_ip; + packet.Read(preferred_fake_ip); + + u32 client_version; + packet.Read(client_version); + + std::string pass; + packet.Read(pass); + + std::string token; + packet.Read(token); + + if (pass != password) { + SendWrongPassword(event->peer); + return; + } + + if (!IsValidNickname(nickname)) { + SendNameCollision(event->peer); + return; + } + + if (preferred_fake_ip != NoPreferredIP) { + // Verify if the preferred fake ip is available + if (!IsValidFakeIPAddress(preferred_fake_ip)) { + SendIPCollision(event->peer); + return; + } + } else { + // Assign a fake ip address of this client automatically + preferred_fake_ip = GenerateFakeIPAddress(); + } + + if (client_version != network_version) { + SendVersionMismatch(event->peer); + return; + } + + // At this point the client is ready to be added to the room. + Member member{}; + member.fake_ip = preferred_fake_ip; + member.nickname = nickname; + member.peer = event->peer; + + std::string uid; + { + std::lock_guard lock(verify_uid_mutex); + uid = verify_uid; + } + member.user_data = verify_backend->LoadUserData(uid, token); + + std::string ip; + { + std::lock_guard lock(ban_list_mutex); + + // Check username ban + if (!member.user_data.username.empty() && + std::find(username_ban_list.begin(), username_ban_list.end(), + member.user_data.username) != username_ban_list.end()) { + + SendUserBanned(event->peer); + return; + } + + // Check IP ban + std::array<char, 256> ip_raw{}; + enet_address_get_host_ip(&event->peer->address, ip_raw.data(), sizeof(ip_raw) - 1); + ip = ip_raw.data(); + + if (std::find(ip_ban_list.begin(), ip_ban_list.end(), ip) != ip_ban_list.end()) { + SendUserBanned(event->peer); + return; + } + } + + // Notify everyone that the user has joined. + SendStatusMessage(IdMemberJoin, member.nickname, member.user_data.username, ip); + + { + std::lock_guard lock(member_mutex); + members.push_back(std::move(member)); + } + + // Notify everyone that the room information has changed. + BroadcastRoomInformation(); + if (HasModPermission(event->peer)) { + SendJoinSuccessAsMod(event->peer, preferred_fake_ip); + } else { + SendJoinSuccess(event->peer, preferred_fake_ip); + } +} + +void Room::RoomImpl::HandleModKickPacket(const ENetEvent* event) { + if (!HasModPermission(event->peer)) { + SendModPermissionDenied(event->peer); + return; + } + + Packet packet; + packet.Append(event->packet->data, event->packet->dataLength); + packet.IgnoreBytes(sizeof(u8)); // Ignore the message type + + std::string nickname; + packet.Read(nickname); + + std::string username, ip; + { + std::lock_guard lock(member_mutex); + const auto target_member = + std::find_if(members.begin(), members.end(), + [&nickname](const auto& member) { return member.nickname == nickname; }); + if (target_member == members.end()) { + SendModNoSuchUser(event->peer); + return; + } + + // Notify the kicked member + SendUserKicked(target_member->peer); + + username = target_member->user_data.username; + + std::array<char, 256> ip_raw{}; + enet_address_get_host_ip(&target_member->peer->address, ip_raw.data(), sizeof(ip_raw) - 1); + ip = ip_raw.data(); + + enet_peer_disconnect(target_member->peer, 0); + members.erase(target_member); + } + + // Announce the change to all clients. + SendStatusMessage(IdMemberKicked, nickname, username, ip); + BroadcastRoomInformation(); +} + +void Room::RoomImpl::HandleModBanPacket(const ENetEvent* event) { + if (!HasModPermission(event->peer)) { + SendModPermissionDenied(event->peer); + return; + } + + Packet packet; + packet.Append(event->packet->data, event->packet->dataLength); + packet.IgnoreBytes(sizeof(u8)); // Ignore the message type + + std::string nickname; + packet.Read(nickname); + + std::string username, ip; + { + std::lock_guard lock(member_mutex); + const auto target_member = + std::find_if(members.begin(), members.end(), + [&nickname](const auto& member) { return member.nickname == nickname; }); + if (target_member == members.end()) { + SendModNoSuchUser(event->peer); + return; + } + + // Notify the banned member + SendUserBanned(target_member->peer); + + nickname = target_member->nickname; + username = target_member->user_data.username; + + std::array<char, 256> ip_raw{}; + enet_address_get_host_ip(&target_member->peer->address, ip_raw.data(), sizeof(ip_raw) - 1); + ip = ip_raw.data(); + + enet_peer_disconnect(target_member->peer, 0); + members.erase(target_member); + } + + { + std::lock_guard lock(ban_list_mutex); + + if (!username.empty()) { + // Ban the forum username + if (std::find(username_ban_list.begin(), username_ban_list.end(), username) == + username_ban_list.end()) { + + username_ban_list.emplace_back(username); + } + } + + // Ban the member's IP as well + if (std::find(ip_ban_list.begin(), ip_ban_list.end(), ip) == ip_ban_list.end()) { + ip_ban_list.emplace_back(ip); + } + } + + // Announce the change to all clients. + SendStatusMessage(IdMemberBanned, nickname, username, ip); + BroadcastRoomInformation(); +} + +void Room::RoomImpl::HandleModUnbanPacket(const ENetEvent* event) { + if (!HasModPermission(event->peer)) { + SendModPermissionDenied(event->peer); + return; + } + + Packet packet; + packet.Append(event->packet->data, event->packet->dataLength); + packet.IgnoreBytes(sizeof(u8)); // Ignore the message type + + std::string address; + packet.Read(address); + + bool unbanned = false; + { + std::lock_guard lock(ban_list_mutex); + + auto it = std::find(username_ban_list.begin(), username_ban_list.end(), address); + if (it != username_ban_list.end()) { + unbanned = true; + username_ban_list.erase(it); + } + + it = std::find(ip_ban_list.begin(), ip_ban_list.end(), address); + if (it != ip_ban_list.end()) { + unbanned = true; + ip_ban_list.erase(it); + } + } + + if (unbanned) { + SendStatusMessage(IdAddressUnbanned, address, "", ""); + } else { + SendModNoSuchUser(event->peer); + } +} + +void Room::RoomImpl::HandleModGetBanListPacket(const ENetEvent* event) { + if (!HasModPermission(event->peer)) { + SendModPermissionDenied(event->peer); + return; + } + + SendModBanListResponse(event->peer); +} + +bool Room::RoomImpl::IsValidNickname(const std::string& nickname) const { + // A nickname is valid if it matches the regex and is not already taken by anybody else in the + // room. + const std::regex nickname_regex("^[ a-zA-Z0-9._-]{4,20}$"); + if (!std::regex_match(nickname, nickname_regex)) + return false; + + std::lock_guard lock(member_mutex); + return std::all_of(members.begin(), members.end(), + [&nickname](const auto& member) { return member.nickname != nickname; }); +} + +bool Room::RoomImpl::IsValidFakeIPAddress(const IPv4Address& address) const { + // An IP address is valid if it is not already taken by anybody else in the room. + std::lock_guard lock(member_mutex); + return std::all_of(members.begin(), members.end(), + [&address](const auto& member) { return member.fake_ip != address; }); +} + +bool Room::RoomImpl::HasModPermission(const ENetPeer* client) const { + std::lock_guard lock(member_mutex); + const auto sending_member = + std::find_if(members.begin(), members.end(), + [client](const auto& member) { return member.peer == client; }); + if (sending_member == members.end()) { + return false; + } + if (room_information.enable_yuzu_mods && + sending_member->user_data.moderator) { // Community moderator + + return true; + } + if (!room_information.host_username.empty() && + sending_member->user_data.username == room_information.host_username) { // Room host + + return true; + } + return false; +} + +void Room::RoomImpl::SendNameCollision(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdNameCollision)); + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendIPCollision(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdIpCollision)); + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendWrongPassword(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdWrongPassword)); + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendRoomIsFull(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdRoomIsFull)); + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendVersionMismatch(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdVersionMismatch)); + packet.Write(network_version); + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendJoinSuccess(ENetPeer* client, IPv4Address fake_ip) { + Packet packet; + packet.Write(static_cast<u8>(IdJoinSuccess)); + packet.Write(fake_ip); + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendJoinSuccessAsMod(ENetPeer* client, IPv4Address fake_ip) { + Packet packet; + packet.Write(static_cast<u8>(IdJoinSuccessAsMod)); + packet.Write(fake_ip); + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendUserKicked(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdHostKicked)); + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendUserBanned(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdHostBanned)); + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendModPermissionDenied(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdModPermissionDenied)); + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendModNoSuchUser(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdModNoSuchUser)); + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendModBanListResponse(ENetPeer* client) { + Packet packet; + packet.Write(static_cast<u8>(IdModBanListResponse)); + { + std::lock_guard lock(ban_list_mutex); + packet.Write(username_ban_list); + packet.Write(ip_ban_list); + } + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_peer_send(client, 0, enet_packet); + enet_host_flush(server); +} + +void Room::RoomImpl::SendCloseMessage() { + Packet packet; + packet.Write(static_cast<u8>(IdCloseRoom)); + std::lock_guard lock(member_mutex); + if (!members.empty()) { + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + for (auto& member : members) { + enet_peer_send(member.peer, 0, enet_packet); + } + } + enet_host_flush(server); + for (auto& member : members) { + enet_peer_disconnect(member.peer, 0); + } +} + +void Room::RoomImpl::SendStatusMessage(StatusMessageTypes type, const std::string& nickname, + const std::string& username, const std::string& ip) { + Packet packet; + packet.Write(static_cast<u8>(IdStatusMessage)); + packet.Write(static_cast<u8>(type)); + packet.Write(nickname); + packet.Write(username); + std::lock_guard lock(member_mutex); + if (!members.empty()) { + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + for (auto& member : members) { + enet_peer_send(member.peer, 0, enet_packet); + } + } + enet_host_flush(server); + + const std::string display_name = + username.empty() ? nickname : fmt::format("{} ({})", nickname, username); + + switch (type) { + case IdMemberJoin: + LOG_INFO(Network, "[{}] {} has joined.", ip, display_name); + break; + case IdMemberLeave: + LOG_INFO(Network, "[{}] {} has left.", ip, display_name); + break; + case IdMemberKicked: + LOG_INFO(Network, "[{}] {} has been kicked.", ip, display_name); + break; + case IdMemberBanned: + LOG_INFO(Network, "[{}] {} has been banned.", ip, display_name); + break; + case IdAddressUnbanned: + LOG_INFO(Network, "{} has been unbanned.", display_name); + break; + } +} + +void Room::RoomImpl::BroadcastRoomInformation() { + Packet packet; + packet.Write(static_cast<u8>(IdRoomInformation)); + packet.Write(room_information.name); + packet.Write(room_information.description); + packet.Write(room_information.member_slots); + packet.Write(room_information.port); + packet.Write(room_information.preferred_game.name); + packet.Write(room_information.host_username); + + packet.Write(static_cast<u32>(members.size())); + { + std::lock_guard lock(member_mutex); + for (const auto& member : members) { + packet.Write(member.nickname); + packet.Write(member.fake_ip); + packet.Write(member.game_info.name); + packet.Write(member.game_info.id); + packet.Write(member.user_data.username); + packet.Write(member.user_data.display_name); + packet.Write(member.user_data.avatar_url); + } + } + + ENetPacket* enet_packet = + enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE); + enet_host_broadcast(server, 0, enet_packet); + enet_host_flush(server); +} + +IPv4Address Room::RoomImpl::GenerateFakeIPAddress() { + IPv4Address result_ip{192, 168, 0, 0}; + std::uniform_int_distribution<> dis(0x01, 0xFE); // Random byte between 1 and 0xFE + do { + for (std::size_t i = 2; i < result_ip.size(); ++i) { + result_ip[i] = dis(random_gen); + } + } while (!IsValidFakeIPAddress(result_ip)); + + return result_ip; +} + +void Room::RoomImpl::HandleProxyPacket(const ENetEvent* event) { + Packet in_packet; + in_packet.Append(event->packet->data, event->packet->dataLength); + in_packet.IgnoreBytes(sizeof(u8)); // Message type + + in_packet.IgnoreBytes(sizeof(u8)); // Domain + in_packet.IgnoreBytes(sizeof(IPv4Address)); // IP + in_packet.IgnoreBytes(sizeof(u16)); // Port + + in_packet.IgnoreBytes(sizeof(u8)); // Domain + IPv4Address remote_ip; + in_packet.Read(remote_ip); // IP + in_packet.IgnoreBytes(sizeof(u16)); // Port + + in_packet.IgnoreBytes(sizeof(u8)); // Protocol + bool broadcast; + in_packet.Read(broadcast); // Broadcast + + Packet out_packet; + out_packet.Append(event->packet->data, event->packet->dataLength); + ENetPacket* enet_packet = enet_packet_create(out_packet.GetData(), out_packet.GetDataSize(), + ENET_PACKET_FLAG_RELIABLE); + + const auto& destination_address = remote_ip; + if (broadcast) { // Send the data to everyone except the sender + std::lock_guard lock(member_mutex); + bool sent_packet = false; + for (const auto& member : members) { + if (member.peer != event->peer) { + sent_packet = true; + enet_peer_send(member.peer, 0, enet_packet); + } + } + + if (!sent_packet) { + enet_packet_destroy(enet_packet); + } + } else { // Send the data only to the destination client + std::lock_guard lock(member_mutex); + auto member = std::find_if(members.begin(), members.end(), + [destination_address](const Member& member_entry) -> bool { + return member_entry.fake_ip == destination_address; + }); + if (member != members.end()) { + enet_peer_send(member->peer, 0, enet_packet); + } else { + LOG_ERROR(Network, + "Attempting to send to unknown IP address: " + "{}.{}.{}.{}", + destination_address[0], destination_address[1], destination_address[2], + destination_address[3]); + enet_packet_destroy(enet_packet); + } + } + enet_host_flush(server); +} + +void Room::RoomImpl::HandleChatPacket(const ENetEvent* event) { + Packet in_packet; + in_packet.Append(event->packet->data, event->packet->dataLength); + + in_packet.IgnoreBytes(sizeof(u8)); // Ignore the message type + std::string message; + in_packet.Read(message); + auto CompareNetworkAddress = [event](const Member member) -> bool { + return member.peer == event->peer; + }; + + std::lock_guard lock(member_mutex); + const auto sending_member = std::find_if(members.begin(), members.end(), CompareNetworkAddress); + if (sending_member == members.end()) { + return; // Received a chat message from a unknown sender + } + + // Limit the size of chat messages to MaxMessageSize + message.resize(std::min(static_cast<u32>(message.size()), MaxMessageSize)); + + Packet out_packet; + out_packet.Write(static_cast<u8>(IdChatMessage)); + out_packet.Write(sending_member->nickname); + out_packet.Write(sending_member->user_data.username); + out_packet.Write(message); + + ENetPacket* enet_packet = enet_packet_create(out_packet.GetData(), out_packet.GetDataSize(), + ENET_PACKET_FLAG_RELIABLE); + bool sent_packet = false; + for (const auto& member : members) { + if (member.peer != event->peer) { + sent_packet = true; + enet_peer_send(member.peer, 0, enet_packet); + } + } + + if (!sent_packet) { + enet_packet_destroy(enet_packet); + } + + enet_host_flush(server); + + if (sending_member->user_data.username.empty()) { + LOG_INFO(Network, "{}: {}", sending_member->nickname, message); + } else { + LOG_INFO(Network, "{} ({}): {}", sending_member->nickname, + sending_member->user_data.username, message); + } +} + +void Room::RoomImpl::HandleGameNamePacket(const ENetEvent* event) { + Packet in_packet; + in_packet.Append(event->packet->data, event->packet->dataLength); + + in_packet.IgnoreBytes(sizeof(u8)); // Ignore the message type + GameInfo game_info; + in_packet.Read(game_info.name); + in_packet.Read(game_info.id); + + { + std::lock_guard lock(member_mutex); + auto member = std::find_if(members.begin(), members.end(), + [event](const Member& member_entry) -> bool { + return member_entry.peer == event->peer; + }); + if (member != members.end()) { + member->game_info = game_info; + + const std::string display_name = + member->user_data.username.empty() + ? member->nickname + : fmt::format("{} ({})", member->nickname, member->user_data.username); + + if (game_info.name.empty()) { + LOG_INFO(Network, "{} is not playing", display_name); + } else { + LOG_INFO(Network, "{} is playing {}", display_name, game_info.name); + } + } + } + BroadcastRoomInformation(); +} + +void Room::RoomImpl::HandleClientDisconnection(ENetPeer* client) { + // Remove the client from the members list. + std::string nickname, username, ip; + { + std::lock_guard lock(member_mutex); + auto member = + std::find_if(members.begin(), members.end(), [client](const Member& member_entry) { + return member_entry.peer == client; + }); + if (member != members.end()) { + nickname = member->nickname; + username = member->user_data.username; + + std::array<char, 256> ip_raw{}; + enet_address_get_host_ip(&member->peer->address, ip_raw.data(), sizeof(ip_raw) - 1); + ip = ip_raw.data(); + + members.erase(member); + } + } + + // Announce the change to all clients. + enet_peer_disconnect(client, 0); + if (!nickname.empty()) + SendStatusMessage(IdMemberLeave, nickname, username, ip); + BroadcastRoomInformation(); +} + +// Room +Room::Room() : room_impl{std::make_unique<RoomImpl>()} {} + +Room::~Room() = default; + +bool Room::Create(const std::string& name, const std::string& description, + const std::string& server_address, u16 server_port, const std::string& password, + const u32 max_connections, const std::string& host_username, + const GameInfo preferred_game, + std::unique_ptr<VerifyUser::Backend> verify_backend, + const Room::BanList& ban_list, bool enable_yuzu_mods) { + ENetAddress address; + address.host = ENET_HOST_ANY; + if (!server_address.empty()) { + enet_address_set_host(&address, server_address.c_str()); + } + address.port = server_port; + + // In order to send the room is full message to the connecting client, we need to leave one + // slot open so enet won't reject the incoming connection without telling us + room_impl->server = enet_host_create(&address, max_connections + 1, NumChannels, 0, 0); + if (!room_impl->server) { + return false; + } + room_impl->state = State::Open; + + room_impl->room_information.name = name; + room_impl->room_information.description = description; + room_impl->room_information.member_slots = max_connections; + room_impl->room_information.port = server_port; + room_impl->room_information.preferred_game = preferred_game; + room_impl->room_information.host_username = host_username; + room_impl->room_information.enable_yuzu_mods = enable_yuzu_mods; + room_impl->password = password; + room_impl->verify_backend = std::move(verify_backend); + room_impl->username_ban_list = ban_list.first; + room_impl->ip_ban_list = ban_list.second; + + room_impl->StartLoop(); + return true; +} + +Room::State Room::GetState() const { + return room_impl->state; +} + +const RoomInformation& Room::GetRoomInformation() const { + return room_impl->room_information; +} + +std::string Room::GetVerifyUID() const { + std::lock_guard lock(room_impl->verify_uid_mutex); + return room_impl->verify_uid; +} + +Room::BanList Room::GetBanList() const { + std::lock_guard lock(room_impl->ban_list_mutex); + return {room_impl->username_ban_list, room_impl->ip_ban_list}; +} + +std::vector<Member> Room::GetRoomMemberList() const { + std::vector<Member> member_list; + std::lock_guard lock(room_impl->member_mutex); + for (const auto& member_impl : room_impl->members) { + Member member; + member.nickname = member_impl.nickname; + member.username = member_impl.user_data.username; + member.display_name = member_impl.user_data.display_name; + member.avatar_url = member_impl.user_data.avatar_url; + member.fake_ip = member_impl.fake_ip; + member.game = member_impl.game_info; + member_list.push_back(member); + } + return member_list; +} + +bool Room::HasPassword() const { + return !room_impl->password.empty(); +} + +void Room::SetVerifyUID(const std::string& uid) { + std::lock_guard lock(room_impl->verify_uid_mutex); + room_impl->verify_uid = uid; +} + +void Room::Destroy() { + room_impl->state = State::Closed; + room_impl->room_thread->join(); + room_impl->room_thread.reset(); + + if (room_impl->server) { + enet_host_destroy(room_impl->server); + } + room_impl->room_information = {}; + room_impl->server = nullptr; + { + std::lock_guard lock(room_impl->member_mutex); + room_impl->members.clear(); + } + room_impl->room_information.member_slots = 0; + room_impl->room_information.name.clear(); +} + +} // namespace Network |