diff options
Diffstat (limited to 'src/network/room.cpp')
| -rw-r--r-- | src/network/room.cpp | 402 |
1 files changed, 398 insertions, 4 deletions
diff --git a/src/network/room.cpp b/src/network/room.cpp index 48de2f5cb..8b7915bb7 100644 --- a/src/network/room.cpp +++ b/src/network/room.cpp @@ -2,7 +2,13 @@ // Licensed under GPLv2 or any later version // Refer to the license.txt file included. +#include <algorithm> +#include <atomic> +#include <random> +#include <thread> +#include <vector> #include "enet/enet.h" +#include "network/packet.h" #include "network/room.h" namespace Network { @@ -12,12 +18,395 @@ static constexpr u32 MaxConcurrentConnections = 10; class Room::RoomImpl { public: + // This MAC address is used to generate a 'Nintendo' like Mac address. + const MacAddress NintendoOUI = {0x00, 0x1F, 0x32, 0x00, 0x00, 0x00}; + std::mt19937 random_gen; ///< Random number generator. Used for GenerateMacAddress + ENetHost* server = nullptr; ///< Network interface. std::atomic<State> state{State::Closed}; ///< Current state of the room. RoomInformation room_information; ///< Information about this room. + + struct Member { + std::string nickname; ///< The nickname of the member. + std::string game_name; ///< The current game of the member + MacAddress mac_address; ///< The assigned mac address of the member. + ENetPeer* peer; ///< The remote peer. + }; + using MemberList = std::vector<Member>; + MemberList members; ///< Information about the members of this room. + + RoomImpl() : random_gen(std::random_device()()) {} + + /// Thread that receives and dispatches network packets + std::unique_ptr<std::thread> room_thread; + + /// 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); + + /** + * 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 MAC address is valid, ie. isn't already taken by someone else in the + * room. + */ + bool IsValidMacAddress(const MacAddress& address) const; + + /** + * Sends a ID_ROOM_NAME_COLLISION message telling the client that the name is invalid. + */ + void SendNameCollision(ENetPeer* client); + + /** + * Sends a ID_ROOM_MAC_COLLISION message telling the client that the MAC is invalid. + */ + void SendMacCollision(ENetPeer* client); + + /** + * Sends a ID_ROOM_VERSION_MISMATCH message telling the client that the version is invalid. + */ + void SendVersionMismatch(ENetPeer* client); + + /** + * Notifies the member that its connection attempt was successful, + * and it is now part of the room. + */ + void SendJoinSuccess(ENetPeer* client, MacAddress mac_address); + + /** + * Notifies the members that the room is closed, + */ + void SendCloseMessage(); + + /** + * 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 + * <u32> member_slots: The max number of clients allowed in this room + * <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 + * <MacAddress> mac_address 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 + */ + MacAddress GenerateMacAddress(); + + /** + * Broadcasts this packet to all members except the sender. + * @param event The ENet event containing the data + */ + void HandleWifiPacket(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, 100) > 0) { + switch (event.type) { + case ENET_EVENT_TYPE_RECEIVE: + switch (event.packet->data[0]) { + case IdJoinRequest: + HandleJoinRequest(&event); + break; + case IdSetGameName: + HandleGameNamePacket(&event); + break; + case IdWifiPacket: + HandleWifiPacket(&event); + break; + case IdChatMessage: + HandleChatPacket(&event); + break; + } + enet_packet_destroy(event.packet); + break; + case ENET_EVENT_TYPE_DISCONNECT: + HandleClientDisconnection(event.peer); + 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) { + Packet packet; + packet.Append(event->packet->data, event->packet->dataLength); + packet.IgnoreBytes(sizeof(u8)); // Igonore the message type + std::string nickname; + packet >> nickname; + + MacAddress preferred_mac; + packet >> preferred_mac; + + u32 client_version; + packet >> client_version; + + if (!IsValidNickname(nickname)) { + SendNameCollision(event->peer); + return; + } + + if (preferred_mac != NoPreferredMac) { + // Verify if the preferred mac is available + if (!IsValidMacAddress(preferred_mac)) { + SendMacCollision(event->peer); + return; + } + } else { + // Assign a MAC address of this client automatically + preferred_mac = GenerateMacAddress(); + } + + 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.mac_address = preferred_mac; + member.nickname = nickname; + member.peer = event->peer; + + members.push_back(std::move(member)); + + // Notify everyone that the room information has changed. + BroadcastRoomInformation(); + SendJoinSuccess(event->peer, preferred_mac); +} + +bool Room::RoomImpl::IsValidNickname(const std::string& nickname) const { + // A nickname is valid if it is not already taken by anybody else in the room. + // TODO(B3N30): Check for empty names, spaces, etc. + return std::all_of(members.begin(), members.end(), + [&nickname](const auto& member) { return member.nickname != nickname; }); +} + +bool Room::RoomImpl::IsValidMacAddress(const MacAddress& address) const { + // A MAC address is valid if it is not already taken by anybody else in the room. + return std::all_of(members.begin(), members.end(), + [&address](const auto& member) { return member.mac_address != address; }); +} + +void Room::RoomImpl::SendNameCollision(ENetPeer* client) { + Packet packet; + packet << 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::SendMacCollision(ENetPeer* client) { + Packet packet; + packet << static_cast<u8>(IdMacCollision); + + 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 << static_cast<u8>(IdVersionMismatch); + packet << 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, MacAddress mac_address) { + Packet packet; + packet << static_cast<u8>(IdJoinSuccess); + packet << mac_address; + 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 << static_cast<u8>(IdCloseRoom); + 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::BroadcastRoomInformation() { + Packet packet; + packet << static_cast<u8>(IdRoomInformation); + packet << room_information.name; + packet << room_information.member_slots; + + packet << static_cast<u32>(members.size()); + for (const auto& member : members) { + packet << member.nickname; + packet << member.mac_address; + packet << member.game_name; + } + + 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); +} + +MacAddress Room::RoomImpl::GenerateMacAddress() { + MacAddress result_mac = + NintendoOUI; // The first three bytes of each MAC address will be the NintendoOUI + std::uniform_int_distribution<> dis(0x00, 0xFF); // Random byte between 0 and 0xFF + do { + for (size_t i = 3; i < result_mac.size(); ++i) { + result_mac[i] = dis(random_gen); + } + } while (!IsValidMacAddress(result_mac)); + return result_mac; +} + +void Room::RoomImpl::HandleWifiPacket(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)); // WifiPacket Type + in_packet.IgnoreBytes(sizeof(u8)); // WifiPacket Channel + in_packet.IgnoreBytes(sizeof(MacAddress)); // WifiPacket Transmitter Address + MacAddress destination_address; + in_packet >> destination_address; + + 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); + + if (destination_address == BroadcastMac) { // Send the data to everyone except the sender + for (const auto& member : members) { + if (member.peer != event->peer) + enet_peer_send(member.peer, 0, enet_packet); + } + } else { // Send the data only to the destination client + auto member = std::find_if(members.begin(), members.end(), + [destination_address](const Member& member) -> bool { + return member.mac_address == destination_address; + }); + if (member != members.end()) { + enet_peer_send(member->peer, 0, 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)); // Igonore the message type + std::string message; + in_packet >> message; + auto CompareNetworkAddress = [event](const Member member) -> bool { + return member.peer == event->peer; + }; + 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 + } + + Packet out_packet; + out_packet << static_cast<u8>(IdChatMessage); + out_packet << sending_member->nickname; + out_packet << message; + + ENetPacket* enet_packet = enet_packet_create(out_packet.GetData(), out_packet.GetDataSize(), + ENET_PACKET_FLAG_RELIABLE); + for (const auto& member : members) { + if (member.peer != event->peer) + enet_peer_send(member.peer, 0, enet_packet); + } + enet_host_flush(server); +} + +void Room::RoomImpl::HandleGameNamePacket(const ENetEvent* event) { + Packet in_packet; + in_packet.Append(event->packet->data, event->packet->dataLength); + + in_packet.IgnoreBytes(sizeof(u8)); // Igonore the message type + std::string game_name; + in_packet >> game_name; + auto member = + std::find_if(members.begin(), members.end(), + [event](const Member& member) -> bool { return member.peer == event->peer; }); + if (member != members.end()) { + member->game_name = game_name; + BroadcastRoomInformation(); + } +} + +void Room::RoomImpl::HandleClientDisconnection(ENetPeer* client) { + // Remove the client from the members list. + members.erase(std::remove_if(members.begin(), members.end(), + [client](const Member& member) { return member.peer == client; }), + members.end()); + + // Announce the change to all clients. + enet_peer_disconnect(client, 0); + BroadcastRoomInformation(); +} + +// Room Room::Room() : room_impl{std::make_unique<RoomImpl>()} {} Room::~Room() = default; @@ -25,7 +414,9 @@ Room::~Room() = default; void Room::Create(const std::string& name, const std::string& server_address, u16 server_port) { ENetAddress address; address.host = ENET_HOST_ANY; - enet_address_set_host(&address, server_address.c_str()); + if (!server_address.empty()) { + enet_address_set_host(&address, server_address.c_str()); + } address.port = server_port; room_impl->server = enet_host_create(&address, MaxConcurrentConnections, NumChannels, 0, 0); @@ -34,8 +425,7 @@ void Room::Create(const std::string& name, const std::string& server_address, u1 room_impl->room_information.name = name; room_impl->room_information.member_slots = MaxConcurrentConnections; - - // TODO(B3N30): Start the receiving thread + room_impl->StartLoop(); } Room::State Room::GetState() const { @@ -48,13 +438,17 @@ const RoomInformation& Room::GetRoomInformation() const { void Room::Destroy() { room_impl->state = State::Closed; - // TODO(B3n30): Join the receiving thread + 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; + room_impl->members.clear(); + room_impl->room_information.member_slots = 0; + room_impl->room_information.name.clear(); } } // namespace Network |