network.hpp

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#pragma once
 
#include <array>
#include <string>
#ifdef _WIN64 // WINDOWS
#define _WINSOCK_DEPRECATED_NO_WARNINGS 1
#ifndef WINSOCK2_IMPORTED
#define WINSOCK2_IMPORTED
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#else // NIX
#include <netinet/in.h>
#include <sys/socket.h>
#endif
#include "SPSCQueue.h"
#include "container_types.hpp"
#include "commands.hpp"
 
namespace sys {
struct state;
};
 
namespace network {
 
inline constexpr short default_server_port = 1984;
 
#ifdef _WIN64
typedef SOCKET socket_t;
#else
typedef int socket_t;
#endif
 
struct client_handshake_data {
    sys::player_name nickname;
    sys::player_password_raw player_password;
    uint8_t lobby_password[16] = {0};
    uint8_t reserved[24] = {0};
};
 
struct server_handshake_data {
    sys::checksum_key scenario_checksum;
    sys::checksum_key save_checksum;
    uint32_t seed;
    dcon::nation_id assigned_nation;
    uint8_t reserved[64] = {0};
};
 
struct client_data {
    dcon::nation_id playing_as{};
    socket_t socket_fd = 0;
    struct sockaddr_storage address;
 
    client_handshake_data hshake_buffer;
    command::payload recv_buffer;
    size_t recv_count = 0;
    std::vector<char> send_buffer;
    std::vector<char> early_send_buffer;
 
    // accounting for save progress
    size_t total_sent_bytes = 0;
    size_t save_stream_offset = 0;
    size_t save_stream_size = 0;
    bool handshake = true;
 
    sys::date last_seen;
 
    bool is_banned(sys::state& state) const;
    inline bool is_active() const {
        return socket_fd > 0;
    }
};
 
struct network_state {
    server_handshake_data s_hshake;
    sys::player_name nickname;
    sys::player_password_raw player_password;
    sys::checksum_key current_save_checksum;
    struct sockaddr_storage address;
    rigtorp::SPSCQueue<command::payload> outgoing_commands;
    std::array<client_data, 128> clients;
    std::vector<struct in6_addr> v6_banlist;
    std::vector<struct in_addr> v4_banlist;
    std::string ip_address = "127.0.0.1";
    std::vector<char> send_buffer;
    std::vector<char> early_send_buffer;
    command::payload recv_buffer;
    std::vector<uint8_t> save_data; //client
 
    std::unique_ptr<uint8_t[]> current_save_buffer;
    size_t recv_count = 0;
    uint32_t current_save_length = 0;
    socket_t socket_fd = 0;
    uint8_t lobby_password[16] = { 0 };
    std::atomic<bool> save_slock = false;
    bool as_v6 = false;
    bool as_server = false;
    bool save_stream = false; //client
    bool is_new_game = true; // has save been loaded?
    bool out_of_sync = false; // network -> game state signal
    bool reported_oos = false; // has oos been reported to host yet?
    bool handshake = true; // if in handshake mode -> expect handshake data
    bool finished = false; //game can run after disconnection but only to show error messages
 
    network_state() : outgoing_commands(1024) {}
    ~network_state() {}
};
 
void init(sys::state& state);
void send_and_receive_commands(sys::state& state);
void finish(sys::state& state, bool notify_host);
void ban_player(sys::state& state, client_data& client);
void kick_player(sys::state& state, client_data& client);
void switch_player(sys::state& state, dcon::nation_id new_n, dcon::nation_id old_n);
void write_network_save(sys::state& state);
void broadcast_save_to_clients(sys::state& state, command::payload& c, uint8_t const* buffer, uint32_t length, sys::checksum_key const& k);
void broadcast_to_clients(sys::state& state, command::payload& c);
void clear_socket(sys::state& state, client_data& client);
void full_reset_after_oos(sys::state& state);
 
dcon::mp_player_id create_mp_player(sys::state& state, sys::player_name& name, sys::player_password_raw& password);
dcon::mp_player_id load_mp_player(sys::state& state, sys::player_name& name, sys::player_password_hash& password_hash, sys::player_password_salt& password_salt);
void update_mp_player_password(sys::state& state, dcon::mp_player_id player_id, sys::player_name& password);
dcon::mp_player_id find_mp_player(sys::state& state, sys::player_name name);
dcon::mp_player_id find_country_player(sys::state& state, dcon::nation_id nation);
void log_player_nations(sys::state& state);
 
void place_host_player_after_saveload(sys::state& state);
bool pause_game(sys::state& state);
bool unpause_game(sys::state& state);
void notify_player_joins(sys::state& state, network::client_data& client);
void notify_player_joins(sys::state& state, sys::player_name name, dcon::nation_id nation);
 
void load_host_settings(sys::state& state);
void save_host_settings(sys::state& state);
 
class port_forwarder {
private:
    std::mutex internal_wait;
    std::thread do_forwarding;
    bool started = false;
public:
    port_forwarder();
    void start_forwarding();
    ~port_forwarder();
};
 
}