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Location: cpp/openttd-patchpack/source/src/network/network.cpp
r25799:67f31839e848
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Codechange: track version of network servers to prune once out-of-date
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* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file network.cpp Base functions for networking support. */
#include "../stdafx.h"
#include "../strings_func.h"
#include "../command_func.h"
#include "../date_func.h"
#include "network_admin.h"
#include "network_client.h"
#include "network_server.h"
#include "network_content.h"
#include "network_udp.h"
#include "network_gamelist.h"
#include "network_base.h"
#include "core/udp.h"
#include "core/host.h"
#include "network_gui.h"
#include "../console_func.h"
#include "../3rdparty/md5/md5.h"
#include "../core/random_func.hpp"
#include "../window_func.h"
#include "../company_func.h"
#include "../company_base.h"
#include "../landscape_type.h"
#include "../rev.h"
#include "../core/pool_func.hpp"
#include "../gfx_func.h"
#include "../error.h"
#include <charconv>
#include <sstream>
#include <iomanip>
#include "../safeguards.h"
#ifdef DEBUG_DUMP_COMMANDS
#include "../fileio_func.h"
/** When running the server till the wait point, run as fast as we can! */
bool _ddc_fastforward = true;
#endif /* DEBUG_DUMP_COMMANDS */
/** Make sure both pools have the same size. */
static_assert(NetworkClientInfoPool::MAX_SIZE == NetworkClientSocketPool::MAX_SIZE);
/** The pool with client information. */
NetworkClientInfoPool _networkclientinfo_pool("NetworkClientInfo");
INSTANTIATE_POOL_METHODS(NetworkClientInfo)
bool _networking; ///< are we in networking mode?
bool _network_server; ///< network-server is active
bool _network_available; ///< is network mode available?
bool _network_dedicated; ///< are we a dedicated server?
bool _is_network_server; ///< Does this client wants to be a network-server?
NetworkCompanyState *_network_company_states = nullptr; ///< Statistics about some companies.
ClientID _network_own_client_id; ///< Our client identifier.
ClientID _redirect_console_to_client; ///< If not invalid, redirect the console output to a client.
bool _network_need_advertise; ///< Whether we need to advertise.
uint8 _network_reconnect; ///< Reconnect timeout
StringList _network_bind_list; ///< The addresses to bind on.
StringList _network_host_list; ///< The servers we know.
StringList _network_ban_list; ///< The banned clients.
uint32 _frame_counter_server; ///< The frame_counter of the server, if in network-mode
uint32 _frame_counter_max; ///< To where we may go with our clients
uint32 _frame_counter; ///< The current frame.
uint32 _last_sync_frame; ///< Used in the server to store the last time a sync packet was sent to clients.
NetworkAddressList _broadcast_list; ///< List of broadcast addresses.
uint32 _sync_seed_1; ///< Seed to compare during sync checks.
#ifdef NETWORK_SEND_DOUBLE_SEED
uint32 _sync_seed_2; ///< Second part of the seed.
#endif
uint32 _sync_frame; ///< The frame to perform the sync check.
bool _network_first_time; ///< Whether we have finished joining or not.
CompanyMask _network_company_passworded; ///< Bitmask of the password status of all companies.
/* Check whether NETWORK_NUM_LANDSCAPES is still in sync with NUM_LANDSCAPE */
static_assert((int)NETWORK_NUM_LANDSCAPES == (int)NUM_LANDSCAPE);
static_assert((int)NETWORK_COMPANY_NAME_LENGTH == MAX_LENGTH_COMPANY_NAME_CHARS * MAX_CHAR_LENGTH);
/** The amount of clients connected */
byte _network_clients_connected = 0;
/* Some externs / forwards */
extern void StateGameLoop();
/**
* Return whether there is any client connected or trying to connect at all.
* @return whether we have any client activity
*/
bool HasClients()
{
return !NetworkClientSocket::Iterate().empty();
}
/**
* Basically a client is leaving us right now.
*/
NetworkClientInfo::~NetworkClientInfo()
{
/* Delete the chat window, if you were chatting with this client. */
InvalidateWindowData(WC_SEND_NETWORK_MSG, DESTTYPE_CLIENT, this->client_id);
}
/**
* Return the CI given it's client-identifier
* @param client_id the ClientID to search for
* @return return a pointer to the corresponding NetworkClientInfo struct or nullptr when not found
*/
/* static */ NetworkClientInfo *NetworkClientInfo::GetByClientID(ClientID client_id)
{
for (NetworkClientInfo *ci : NetworkClientInfo::Iterate()) {
if (ci->client_id == client_id) return ci;
}
return nullptr;
}
/**
* Return the client state given it's client-identifier
* @param client_id the ClientID to search for
* @return return a pointer to the corresponding NetworkClientSocket struct or nullptr when not found
*/
/* static */ ServerNetworkGameSocketHandler *ServerNetworkGameSocketHandler::GetByClientID(ClientID client_id)
{
for (NetworkClientSocket *cs : NetworkClientSocket::Iterate()) {
if (cs->client_id == client_id) return cs;
}
return nullptr;
}
byte NetworkSpectatorCount()
{
byte count = 0;
for (const NetworkClientInfo *ci : NetworkClientInfo::Iterate()) {
if (ci->client_playas == COMPANY_SPECTATOR) count++;
}
/* Don't count a dedicated server as spectator */
if (_network_dedicated) count--;
return count;
}
/**
* Change the company password of a given company.
* @param company_id ID of the company the password should be changed for.
* @param password The unhashed password we like to set ('*' or '' resets the password)
* @return The password.
*/
std::string NetworkChangeCompanyPassword(CompanyID company_id, std::string password)
{
if (password.compare("*") == 0) password = "";
if (_network_server) {
NetworkServerSetCompanyPassword(company_id, password, false);
} else {
NetworkClientSetCompanyPassword(password);
}
return password;
}
/**
* Hash the given password using server ID and game seed.
* @param password Password to hash.
* @param password_server_id Server ID.
* @param password_game_seed Game seed.
* @return The hashed password.
*/
std::string GenerateCompanyPasswordHash(const std::string &password, const std::string &password_server_id, uint32 password_game_seed)
{
if (password.empty()) return password;
size_t password_length = password.size();
size_t password_server_id_length = password_server_id.size();
std::ostringstream salted_password;
/* Add the password with the server's ID and game seed as the salt. */
for (uint i = 0; i < NETWORK_SERVER_ID_LENGTH - 1; i++) {
char password_char = (i < password_length ? password[i] : 0);
char server_id_char = (i < password_server_id_length ? password_server_id[i] : 0);
char seed_char = password_game_seed >> (i % 32);
salted_password << (char)(password_char ^ server_id_char ^ seed_char); // Cast needed, otherwise interpreted as integer to format
}
Md5 checksum;
uint8 digest[16];
/* Generate the MD5 hash */
std::string salted_password_string = salted_password.str();
checksum.Append(salted_password_string.data(), salted_password_string.size());
checksum.Finish(digest);
std::ostringstream hashed_password;
hashed_password << std::hex << std::setfill('0');
for (int di = 0; di < 16; di++) hashed_password << std::setw(2) << (int)digest[di]; // Cast needed, otherwise interpreted as character to add
return hashed_password.str();
}
/**
* Check if the company we want to join requires a password.
* @param company_id id of the company we want to check the 'passworded' flag for.
* @return true if the company requires a password.
*/
bool NetworkCompanyIsPassworded(CompanyID company_id)
{
return HasBit(_network_company_passworded, company_id);
}
/* This puts a text-message to the console, or in the future, the chat-box,
* (to keep it all a bit more general)
* If 'self_send' is true, this is the client who is sending the message */
void NetworkTextMessage(NetworkAction action, TextColour colour, bool self_send, const std::string &name, const std::string &str, int64 data)
{
StringID strid;
switch (action) {
case NETWORK_ACTION_SERVER_MESSAGE:
/* Ignore invalid messages */
strid = STR_NETWORK_SERVER_MESSAGE;
colour = CC_DEFAULT;
break;
case NETWORK_ACTION_COMPANY_SPECTATOR:
colour = CC_DEFAULT;
strid = STR_NETWORK_MESSAGE_CLIENT_COMPANY_SPECTATE;
break;
case NETWORK_ACTION_COMPANY_JOIN:
colour = CC_DEFAULT;
strid = STR_NETWORK_MESSAGE_CLIENT_COMPANY_JOIN;
break;
case NETWORK_ACTION_COMPANY_NEW:
colour = CC_DEFAULT;
strid = STR_NETWORK_MESSAGE_CLIENT_COMPANY_NEW;
break;
case NETWORK_ACTION_JOIN:
/* Show the Client ID for the server but not for the client. */
strid = _network_server ? STR_NETWORK_MESSAGE_CLIENT_JOINED_ID : STR_NETWORK_MESSAGE_CLIENT_JOINED;
break;
case NETWORK_ACTION_LEAVE: strid = STR_NETWORK_MESSAGE_CLIENT_LEFT; break;
case NETWORK_ACTION_NAME_CHANGE: strid = STR_NETWORK_MESSAGE_NAME_CHANGE; break;
case NETWORK_ACTION_GIVE_MONEY: strid = STR_NETWORK_MESSAGE_GIVE_MONEY; break;
case NETWORK_ACTION_CHAT_COMPANY: strid = self_send ? STR_NETWORK_CHAT_TO_COMPANY : STR_NETWORK_CHAT_COMPANY; break;
case NETWORK_ACTION_CHAT_CLIENT: strid = self_send ? STR_NETWORK_CHAT_TO_CLIENT : STR_NETWORK_CHAT_CLIENT; break;
case NETWORK_ACTION_KICKED: strid = STR_NETWORK_MESSAGE_KICKED; break;
default: strid = STR_NETWORK_CHAT_ALL; break;
}
char message[1024];
SetDParamStr(0, name);
SetDParamStr(1, str);
SetDParam(2, data);
/* All of these strings start with "***". These characters are interpreted as both left-to-right and
* right-to-left characters depending on the context. As the next text might be an user's name, the
* user name's characters will influence the direction of the "***" instead of the language setting
* of the game. Manually set the direction of the "***" by inserting a text-direction marker. */
char *msg_ptr = message + Utf8Encode(message, _current_text_dir == TD_LTR ? CHAR_TD_LRM : CHAR_TD_RLM);
GetString(msg_ptr, strid, lastof(message));
Debug(desync, 1, "msg: {:08x}; {:02x}; {}", _date, _date_fract, message);
IConsolePrint(colour, message);
NetworkAddChatMessage((TextColour)colour, _settings_client.gui.network_chat_timeout, message);
}
/* Calculate the frame-lag of a client */
uint NetworkCalculateLag(const NetworkClientSocket *cs)
{
int lag = cs->last_frame_server - cs->last_frame;
/* This client has missed their ACK packet after 1 DAY_TICKS..
* so we increase their lag for every frame that passes!
* The packet can be out by a max of _net_frame_freq */
if (cs->last_frame_server + DAY_TICKS + _settings_client.network.frame_freq < _frame_counter) {
lag += _frame_counter - (cs->last_frame_server + DAY_TICKS + _settings_client.network.frame_freq);
}
return lag;
}
/* There was a non-recoverable error, drop back to the main menu with a nice
* error */
void ShowNetworkError(StringID error_string)
{
_switch_mode = SM_MENU;
ShowErrorMessage(error_string, INVALID_STRING_ID, WL_CRITICAL);
}
/**
* Retrieve the string id of an internal error number
* @param err NetworkErrorCode
* @return the StringID
*/
StringID GetNetworkErrorMsg(NetworkErrorCode err)
{
/* List of possible network errors, used by
* PACKET_SERVER_ERROR and PACKET_CLIENT_ERROR */
static const StringID network_error_strings[] = {
STR_NETWORK_ERROR_CLIENT_GENERAL,
STR_NETWORK_ERROR_CLIENT_DESYNC,
STR_NETWORK_ERROR_CLIENT_SAVEGAME,
STR_NETWORK_ERROR_CLIENT_CONNECTION_LOST,
STR_NETWORK_ERROR_CLIENT_PROTOCOL_ERROR,
STR_NETWORK_ERROR_CLIENT_NEWGRF_MISMATCH,
STR_NETWORK_ERROR_CLIENT_NOT_AUTHORIZED,
STR_NETWORK_ERROR_CLIENT_NOT_EXPECTED,
STR_NETWORK_ERROR_CLIENT_WRONG_REVISION,
STR_NETWORK_ERROR_CLIENT_NAME_IN_USE,
STR_NETWORK_ERROR_CLIENT_WRONG_PASSWORD,
STR_NETWORK_ERROR_CLIENT_COMPANY_MISMATCH,
STR_NETWORK_ERROR_CLIENT_KICKED,
STR_NETWORK_ERROR_CLIENT_CHEATER,
STR_NETWORK_ERROR_CLIENT_SERVER_FULL,
STR_NETWORK_ERROR_CLIENT_TOO_MANY_COMMANDS,
STR_NETWORK_ERROR_CLIENT_TIMEOUT_PASSWORD,
STR_NETWORK_ERROR_CLIENT_TIMEOUT_COMPUTER,
STR_NETWORK_ERROR_CLIENT_TIMEOUT_MAP,
STR_NETWORK_ERROR_CLIENT_TIMEOUT_JOIN,
STR_NETWORK_ERROR_CLIENT_INVALID_CLIENT_NAME,
};
static_assert(lengthof(network_error_strings) == NETWORK_ERROR_END);
if (err >= (ptrdiff_t)lengthof(network_error_strings)) err = NETWORK_ERROR_GENERAL;
return network_error_strings[err];
}
/**
* Handle the pause mode change so we send the right messages to the chat.
* @param prev_mode The previous pause mode.
* @param changed_mode The pause mode that got changed.
*/
void NetworkHandlePauseChange(PauseMode prev_mode, PauseMode changed_mode)
{
if (!_networking) return;
switch (changed_mode) {
case PM_PAUSED_NORMAL:
case PM_PAUSED_JOIN:
case PM_PAUSED_GAME_SCRIPT:
case PM_PAUSED_ACTIVE_CLIENTS:
case PM_PAUSED_LINK_GRAPH: {
bool changed = ((_pause_mode == PM_UNPAUSED) != (prev_mode == PM_UNPAUSED));
bool paused = (_pause_mode != PM_UNPAUSED);
if (!paused && !changed) return;
StringID str;
if (!changed) {
int i = -1;
if ((_pause_mode & PM_PAUSED_NORMAL) != PM_UNPAUSED) SetDParam(++i, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_MANUAL);
if ((_pause_mode & PM_PAUSED_JOIN) != PM_UNPAUSED) SetDParam(++i, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_CONNECTING_CLIENTS);
if ((_pause_mode & PM_PAUSED_GAME_SCRIPT) != PM_UNPAUSED) SetDParam(++i, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_GAME_SCRIPT);
if ((_pause_mode & PM_PAUSED_ACTIVE_CLIENTS) != PM_UNPAUSED) SetDParam(++i, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_NOT_ENOUGH_PLAYERS);
if ((_pause_mode & PM_PAUSED_LINK_GRAPH) != PM_UNPAUSED) SetDParam(++i, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_LINK_GRAPH);
str = STR_NETWORK_SERVER_MESSAGE_GAME_STILL_PAUSED_1 + i;
} else {
switch (changed_mode) {
case PM_PAUSED_NORMAL: SetDParam(0, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_MANUAL); break;
case PM_PAUSED_JOIN: SetDParam(0, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_CONNECTING_CLIENTS); break;
case PM_PAUSED_GAME_SCRIPT: SetDParam(0, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_GAME_SCRIPT); break;
case PM_PAUSED_ACTIVE_CLIENTS: SetDParam(0, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_NOT_ENOUGH_PLAYERS); break;
case PM_PAUSED_LINK_GRAPH: SetDParam(0, STR_NETWORK_SERVER_MESSAGE_GAME_REASON_LINK_GRAPH); break;
default: NOT_REACHED();
}
str = paused ? STR_NETWORK_SERVER_MESSAGE_GAME_PAUSED : STR_NETWORK_SERVER_MESSAGE_GAME_UNPAUSED;
}
NetworkTextMessage(NETWORK_ACTION_SERVER_MESSAGE, CC_DEFAULT, false, "", GetString(str));
break;
}
default:
return;
}
}
/**
* Helper function for the pause checkers. If pause is true and the
* current pause mode isn't set the game will be paused, if it it false
* and the pause mode is set the game will be unpaused. In the other
* cases nothing happens to the pause state.
* @param pause whether we'd like to pause
* @param pm the mode which we would like to pause with
*/
static void CheckPauseHelper(bool pause, PauseMode pm)
{
if (pause == ((_pause_mode & pm) != PM_UNPAUSED)) return;
DoCommandP(0, pm, pause ? 1 : 0, CMD_PAUSE);
}
/**
* Counts the number of active clients connected.
* It has to be in STATUS_ACTIVE and not a spectator
* @return number of active clients
*/
static uint NetworkCountActiveClients()
{
uint count = 0;
for (const NetworkClientSocket *cs : NetworkClientSocket::Iterate()) {
if (cs->status != NetworkClientSocket::STATUS_ACTIVE) continue;
if (!Company::IsValidID(cs->GetInfo()->client_playas)) continue;
count++;
}
return count;
}
/**
* Check if the minimum number of active clients has been reached and pause or unpause the game as appropriate
*/
static void CheckMinActiveClients()
{
if ((_pause_mode & PM_PAUSED_ERROR) != PM_UNPAUSED ||
!_network_dedicated ||
(_settings_client.network.min_active_clients == 0 && (_pause_mode & PM_PAUSED_ACTIVE_CLIENTS) == PM_UNPAUSED)) {
return;
}
CheckPauseHelper(NetworkCountActiveClients() < _settings_client.network.min_active_clients, PM_PAUSED_ACTIVE_CLIENTS);
}
/**
* Checks whether there is a joining client
* @return true iff one client is joining (but not authorizing)
*/
static bool NetworkHasJoiningClient()
{
for (const NetworkClientSocket *cs : NetworkClientSocket::Iterate()) {
if (cs->status >= NetworkClientSocket::STATUS_AUTHORIZED && cs->status < NetworkClientSocket::STATUS_ACTIVE) return true;
}
return false;
}
/**
* Check whether we should pause on join
*/
static void CheckPauseOnJoin()
{
if ((_pause_mode & PM_PAUSED_ERROR) != PM_UNPAUSED ||
(!_settings_client.network.pause_on_join && (_pause_mode & PM_PAUSED_JOIN) == PM_UNPAUSED)) {
return;
}
CheckPauseHelper(NetworkHasJoiningClient(), PM_PAUSED_JOIN);
}
/**
* Converts a string to ip/port/company
* Format: IP:port#company
*
* Returns the IP part as a string view into the passed string. This view is
* valid as long the passed connection string is valid. If there is no port
* present in the connection string, the port reference will not be touched.
* When there is no company ID present in the connection string or company_id
* is nullptr, then company ID will not be touched.
*
* @param connection_string The string with the connection data.
* @param port The port reference to set.
* @param company_id The company ID to set, if available.
* @return A std::string_view into the connection string with the (IP) address part.
*/
std::string_view ParseFullConnectionString(const std::string &connection_string, uint16 &port, CompanyID *company_id)
{
std::string_view ip = connection_string;
if (company_id != nullptr) {
size_t offset = ip.find_last_of('#');
if (offset != std::string::npos) {
std::string_view company_string = ip.substr(offset + 1);
ip = ip.substr(0, offset);
uint8 company_value;
auto [_, err] = std::from_chars(company_string.data(), company_string.data() + company_string.size(), company_value);
if (err == std::errc()) {
if (company_value != COMPANY_NEW_COMPANY && company_value != COMPANY_SPECTATOR) {
if (company_value > MAX_COMPANIES || company_value == 0) {
*company_id = COMPANY_SPECTATOR;
} else {
/* "#1" means the first company, which has index 0. */
*company_id = (CompanyID)(company_value - 1);
}
} else {
*company_id = (CompanyID)company_value;
}
}
}
}
size_t port_offset = ip.find_last_of(':');
size_t ipv6_close = ip.find_last_of(']');
if (port_offset != std::string::npos && (ipv6_close == std::string::npos || ipv6_close < port_offset)) {
std::string_view port_string = ip.substr(port_offset + 1);
ip = ip.substr(0, port_offset);
std::from_chars(port_string.data(), port_string.data() + port_string.size(), port);
}
return ip;
}
/**
* Normalize a connection string. That is, ensure there is a port in the string.
* @param connection_string The connection string to normalize.
* @param default_port The port to use if none is given.
* @return The normalized connection string.
*/
std::string NormalizeConnectionString(const std::string &connection_string, uint16 default_port)
{
uint16 port = default_port;
std::string_view ip = ParseFullConnectionString(connection_string, port);
return std::string(ip) + ":" + std::to_string(port);
}
/**
* Convert a string containing either "hostname" or "hostname:ip" to a
* NetworkAddress.
*
* @param connection_string The string to parse.
* @param default_port The default port to set port to if not in connection_string.
* @return A valid NetworkAddress of the parsed information.
*/
NetworkAddress ParseConnectionString(const std::string &connection_string, uint16 default_port)
{
uint16 port = default_port;
std::string_view ip = ParseFullConnectionString(connection_string, port);
return NetworkAddress(ip, port);
}
/**
* Convert a string containing either "hostname" or "hostname:ip" to a
* NetworkAddress, where the string can be postfixed with "#company" to
* indicate the requested company.
*
* @param connection_string The string to parse.
* @param default_port The default port to set port to if not in connection_string.
* @param company Pointer to the company variable to set iff indicted.
* @return A valid NetworkAddress of the parsed information.
*/
static NetworkAddress ParseGameConnectionString(const std::string &connection_string, uint16 default_port, CompanyID *company)
{
uint16 port = default_port;
std::string_view ip = ParseFullConnectionString(connection_string, port, company);
return NetworkAddress(ip, port);
}
/**
* Handle the accepting of a connection to the server.
* @param s The socket of the new connection.
* @param address The address of the peer.
*/
/* static */ void ServerNetworkGameSocketHandler::AcceptConnection(SOCKET s, const NetworkAddress &address)
{
/* Register the login */
_network_clients_connected++;
ServerNetworkGameSocketHandler *cs = new ServerNetworkGameSocketHandler(s);
cs->client_address = address; // Save the IP of the client
InvalidateWindowData(WC_CLIENT_LIST, 0);
}
/**
* Resets the pools used for network clients, and the admin pool if needed.
* @param close_admins Whether the admin pool has to be cleared as well.
*/
static void InitializeNetworkPools(bool close_admins = true)
{
PoolBase::Clean(PT_NCLIENT | (close_admins ? PT_NADMIN : PT_NONE));
}
/**
* Close current connections.
* @param close_admins Whether the admin connections have to be closed as well.
*/
void NetworkClose(bool close_admins)
{
if (_network_server) {
if (close_admins) {
for (ServerNetworkAdminSocketHandler *as : ServerNetworkAdminSocketHandler::Iterate()) {
as->CloseConnection(true);
}
}
for (NetworkClientSocket *cs : NetworkClientSocket::Iterate()) {
cs->CloseConnection(NETWORK_RECV_STATUS_CLIENT_QUIT);
}
ServerNetworkGameSocketHandler::CloseListeners();
ServerNetworkAdminSocketHandler::CloseListeners();
} else if (MyClient::my_client != nullptr) {
MyClient::SendQuit();
MyClient::my_client->CloseConnection(NETWORK_RECV_STATUS_CLIENT_QUIT);
}
TCPConnecter::KillAll();
_networking = false;
_network_server = false;
NetworkFreeLocalCommandQueue();
delete[] _network_company_states;
_network_company_states = nullptr;
InitializeNetworkPools(close_admins);
}
/* Initializes the network (cleans sockets and stuff) */
static void NetworkInitialize(bool close_admins = true)
{
InitializeNetworkPools(close_admins);
NetworkUDPInitialize();
_sync_frame = 0;
_network_first_time = true;
_network_reconnect = 0;
}
/** Non blocking connection to query servers for their game info. */
class TCPQueryConnecter : TCPConnecter {
private:
std::string connection_string;
public:
TCPQueryConnecter(const std::string &connection_string) : TCPConnecter(connection_string, NETWORK_DEFAULT_PORT), connection_string(connection_string) {}
void OnFailure() override
{
NetworkGameList *item = NetworkGameListAddItem(connection_string);
item->online = false;
UpdateNetworkGameWindow();
}
void OnConnect(SOCKET s) override
{
_networking = true;
new ClientNetworkGameSocketHandler(s, this->connection_string);
MyClient::SendInformationQuery(false);
}
};
/**
* Query a server to fetch the game-info.
* @param connection_string the address to query.
*/
void NetworkQueryServer(const std::string &connection_string)
{
if (!_network_available) return;
NetworkInitialize();
new TCPQueryConnecter(connection_string);
}
/** Non blocking connection to query servers for their game and company info. */
class TCPLobbyQueryConnecter : TCPConnecter {
private:
std::string connection_string;
public:
TCPLobbyQueryConnecter(const std::string &connection_string) : TCPConnecter(connection_string, NETWORK_DEFAULT_PORT), connection_string(connection_string) {}
void OnFailure() override
{
CloseWindowById(WC_NETWORK_WINDOW, WN_NETWORK_WINDOW_LOBBY);
ShowErrorMessage(STR_NETWORK_ERROR_NOCONNECTION, INVALID_STRING_ID, WL_ERROR);
}
void OnConnect(SOCKET s) override
{
_networking = true;
new ClientNetworkGameSocketHandler(s, this->connection_string);
MyClient::SendInformationQuery(true);
}
};
/**
* Query a server to fetch the game-info for the lobby.
* @param connection_string the address to query.
*/
void NetworkQueryLobbyServer(const std::string &connection_string)
{
if (!_network_available) return;
NetworkInitialize();
new TCPLobbyQueryConnecter(connection_string);
}
/**
* Validates an address entered as a string and adds the server to
* the list. If you use this function, the games will be marked
* as manually added.
* @param connection_string The IP:port of the server to add.
* @param manually Whether the enter should be marked as manual added.
* @param never_expire Whether the entry can expire (removed when no longer found in the public listing).
* @return The entry on the game list.
*/
NetworkGameList *NetworkAddServer(const std::string &connection_string, bool manually, bool never_expire)
{
if (connection_string.empty()) return nullptr;
/* Ensure the item already exists in the list */
NetworkGameList *item = NetworkGameListAddItem(connection_string);
if (item->info.server_name.empty()) {
ClearGRFConfigList(&item->info.grfconfig);
item->info.server_name = connection_string;
UpdateNetworkGameWindow();
NetworkQueryServer(connection_string);
}
if (manually) item->manually = true;
if (never_expire) item->version = INT32_MAX;
return item;
}
/**
* Get the addresses to bind to.
* @param addresses the list to write to.
* @param port the port to bind to.
*/
void GetBindAddresses(NetworkAddressList *addresses, uint16 port)
{
for (const auto &iter : _network_bind_list) {
addresses->emplace_back(iter.c_str(), port);
}
/* No address, so bind to everything. */
if (addresses->size() == 0) {
addresses->emplace_back("", port);
}
}
/* Generates the list of manually added hosts from NetworkGameList and
* dumps them into the array _network_host_list. This array is needed
* by the function that generates the config file. */
void NetworkRebuildHostList()
{
_network_host_list.clear();
for (NetworkGameList *item = _network_game_list; item != nullptr; item = item->next) {
if (item->manually) _network_host_list.emplace_back(item->connection_string);
}
}
/** Non blocking connection create to actually connect to servers */
class TCPClientConnecter : TCPConnecter {
private:
std::string connection_string;
public:
TCPClientConnecter(const std::string &connection_string) : TCPConnecter(connection_string, NETWORK_DEFAULT_PORT), connection_string(connection_string) {}
void OnFailure() override
{
ShowNetworkError(STR_NETWORK_ERROR_NOCONNECTION);
}
void OnConnect(SOCKET s) override
{
_networking = true;
new ClientNetworkGameSocketHandler(s, this->connection_string);
IConsoleCmdExec("exec scripts/on_client.scr 0");
NetworkClient_Connected();
}
};
/**
* Join a client to the server at with the given connection string.
* The default for the passwords is \c nullptr. When the server or company needs a
* password and none is given, the user is asked to enter the password in the GUI.
* This function will return false whenever some information required to join is not
* correct such as the company number or the client's name, or when there is not
* networking avalabile at all. If the function returns false the connection with
* the existing server is not disconnected.
* It will return true when it starts the actual join process, i.e. when it
* actually shows the join status window.
*
* @param connection_string The IP address, port and company number to join as.
* @param default_company The company number to join as when none is given.
* @param join_server_password The password for the server.
* @param join_company_password The password for the company.
* @return Whether the join has started.
*/
bool NetworkClientConnectGame(const std::string &connection_string, CompanyID default_company, const std::string &join_server_password, const std::string &join_company_password)
{
CompanyID join_as = default_company;
std::string resolved_connection_string = ParseGameConnectionString(connection_string, NETWORK_DEFAULT_PORT, &join_as).GetAddressAsString(false);
if (!_network_available) return false;
if (!NetworkValidateOurClientName()) return false;
_network_join.connection_string = resolved_connection_string;
_network_join.company = join_as;
_network_join.server_password = join_server_password;
_network_join.company_password = join_company_password;
if (_game_mode == GM_MENU) {
/* From the menu we can immediately continue with the actual join. */
NetworkClientJoinGame();
} else {
/* When already playing a game, first go back to the main menu. This
* disconnects the user from the current game, meaning we can safely
* load in the new. After all, there is little point in continueing to
* play on a server if we are connecting to another one.
*/
_switch_mode = SM_JOIN_GAME;
}
return true;
}
/**
* Actually perform the joining to the server. Use #NetworkClientConnectGame
* when you want to connect to a specific server/company. This function
* assumes _network_join is already fully set up.
*/
void NetworkClientJoinGame()
{
NetworkDisconnect();
NetworkInitialize();
_settings_client.network.last_joined = _network_join.connection_string;
_network_join_status = NETWORK_JOIN_STATUS_CONNECTING;
ShowJoinStatusWindow();
new TCPClientConnecter(_network_join.connection_string);
}
static void NetworkInitGameInfo()
{
FillStaticNetworkServerGameInfo();
/* The server is a client too */
_network_game_info.clients_on = _network_dedicated ? 0 : 1;
/* There should be always space for the server. */
assert(NetworkClientInfo::CanAllocateItem());
NetworkClientInfo *ci = new NetworkClientInfo(CLIENT_ID_SERVER);
ci->client_playas = _network_dedicated ? COMPANY_SPECTATOR : COMPANY_FIRST;
ci->client_name = _settings_client.network.client_name;
}
/**
* Trim the given server name in place, i.e. remove leading and trailing spaces.
* After the trim check whether the server name is not empty.
* When the server name is empty a GUI error message is shown telling the
* user to set the servername and this function returns false.
*
* @param server_name The server name to validate. It will be trimmed of leading
* and trailing spaces.
* @return True iff the server name is valid.
*/
bool NetworkValidateServerName(std::string &server_name)
{
StrTrimInPlace(server_name);
if (!server_name.empty()) return true;
ShowErrorMessage(STR_NETWORK_ERROR_BAD_SERVER_NAME, INVALID_STRING_ID, WL_ERROR);
return false;
}
/**
* Check whether the client and server name are set, for a dedicated server and if not set them to some default
* value and tell the user to change this as soon as possible.
* If the saved name is the default value, then the user is told to override this value too.
* This is only meant dedicated servers, as for the other servers the GUI ensures a name has been entered.
*/
static void CheckClientAndServerName()
{
static const std::string fallback_client_name = "Unnamed Client";
StrTrimInPlace(_settings_client.network.client_name);
if (_settings_client.network.client_name.empty() || _settings_client.network.client_name.compare(fallback_client_name) == 0) {
Debug(net, 1, "No \"client_name\" has been set, using \"{}\" instead. Please set this now using the \"name <new name>\" command", fallback_client_name);
_settings_client.network.client_name = fallback_client_name;
}
static const std::string fallback_server_name = "Unnamed Server";
StrTrimInPlace(_settings_client.network.server_name);
if (_settings_client.network.server_name.empty() || _settings_client.network.server_name.compare(fallback_server_name) == 0) {
Debug(net, 1, "No \"server_name\" has been set, using \"{}\" instead. Please set this now using the \"server_name <new name>\" command", fallback_server_name);
_settings_client.network.server_name = fallback_server_name;
}
}
bool NetworkServerStart()
{
if (!_network_available) return false;
/* Call the pre-scripts */
IConsoleCmdExec("exec scripts/pre_server.scr 0");
if (_network_dedicated) IConsoleCmdExec("exec scripts/pre_dedicated.scr 0");
/* Check for the client and server names to be set, but only after the scripts had a chance to set them.*/
if (_network_dedicated) CheckClientAndServerName();
NetworkDisconnect(false, false);
NetworkInitialize(false);
Debug(net, 5, "Starting listeners for clients");
if (!ServerNetworkGameSocketHandler::Listen(_settings_client.network.server_port)) return false;
/* Only listen for admins when the password isn't empty. */
if (!_settings_client.network.admin_password.empty()) {
Debug(net, 5, "Starting listeners for admins");
if (!ServerNetworkAdminSocketHandler::Listen(_settings_client.network.server_admin_port)) return false;
}
/* Try to start UDP-server */
Debug(net, 5, "Starting listeners for incoming server queries");
NetworkUDPServerListen();
_network_company_states = new NetworkCompanyState[MAX_COMPANIES];
_network_server = true;
_networking = true;
_frame_counter = 0;
_frame_counter_server = 0;
_frame_counter_max = 0;
_last_sync_frame = 0;
_network_own_client_id = CLIENT_ID_SERVER;
_network_clients_connected = 0;
_network_company_passworded = 0;
NetworkInitGameInfo();
/* execute server initialization script */
IConsoleCmdExec("exec scripts/on_server.scr 0");
/* if the server is dedicated ... add some other script */
if (_network_dedicated) IConsoleCmdExec("exec scripts/on_dedicated.scr 0");
/* Try to register us to the master server */
_network_need_advertise = true;
NetworkUDPAdvertise();
/* welcome possibly still connected admins - this can only happen on a dedicated server. */
if (_network_dedicated) ServerNetworkAdminSocketHandler::WelcomeAll();
return true;
}
/* The server is rebooting...
* The only difference with NetworkDisconnect, is the packets that is sent */
void NetworkReboot()
{
if (_network_server) {
for (NetworkClientSocket *cs : NetworkClientSocket::Iterate()) {
cs->SendNewGame();
cs->SendPackets();
}
for (ServerNetworkAdminSocketHandler *as : ServerNetworkAdminSocketHandler::IterateActive()) {
as->SendNewGame();
as->SendPackets();
}
}
/* For non-dedicated servers we have to kick the admins as we are not
* certain that we will end up in a new network game. */
NetworkClose(!_network_dedicated);
}
/**
* We want to disconnect from the host/clients.
* @param blocking whether to wait till everything has been closed.
* @param close_admins Whether the admin sockets need to be closed as well.
*/
void NetworkDisconnect(bool blocking, bool close_admins)
{
if (_network_server) {
for (NetworkClientSocket *cs : NetworkClientSocket::Iterate()) {
cs->SendShutdown();
cs->SendPackets();
}
if (close_admins) {
for (ServerNetworkAdminSocketHandler *as : ServerNetworkAdminSocketHandler::IterateActive()) {
as->SendShutdown();
as->SendPackets();
}
}
}
if (_settings_client.network.server_advertise) NetworkUDPRemoveAdvertise(blocking);
CloseWindowById(WC_NETWORK_STATUS_WINDOW, WN_NETWORK_STATUS_WINDOW_JOIN);
NetworkClose(close_admins);
/* Reinitialize the UDP stack, i.e. close all existing connections. */
NetworkUDPInitialize();
}
/**
* Receives something from the network.
* @return true if everything went fine, false when the connection got closed.
*/
static bool NetworkReceive()
{
if (_network_server) {
ServerNetworkAdminSocketHandler::Receive();
return ServerNetworkGameSocketHandler::Receive();
} else {
return ClientNetworkGameSocketHandler::Receive();
}
}
/* This sends all buffered commands (if possible) */
static void NetworkSend()
{
if (_network_server) {
ServerNetworkAdminSocketHandler::Send();
ServerNetworkGameSocketHandler::Send();
} else {
ClientNetworkGameSocketHandler::Send();
}
}
/**
* We have to do some (simple) background stuff that runs normally,
* even when we are not in multiplayer. For example stuff needed
* for finding servers or downloading content.
*/
void NetworkBackgroundLoop()
{
_network_content_client.SendReceive();
TCPConnecter::CheckCallbacks();
NetworkHTTPSocketHandler::HTTPReceive();
NetworkBackgroundUDPLoop();
}
/* The main loop called from ttd.c
* Here we also have to do StateGameLoop if needed! */
void NetworkGameLoop()
{
if (!_networking) return;
if (!NetworkReceive()) return;
if (_network_server) {
/* Log the sync state to check for in-syncedness of replays. */
if (_date_fract == 0) {
/* We don't want to log multiple times if paused. */
static Date last_log;
if (last_log != _date) {
Debug(desync, 1, "sync: {:08x}; {:02x}; {:08x}; {:08x}", _date, _date_fract, _random.state[0], _random.state[1]);
last_log = _date;
}
}
#ifdef DEBUG_DUMP_COMMANDS
/* Loading of the debug commands from -ddesync>=1 */
static FILE *f = FioFOpenFile("commands.log", "rb", SAVE_DIR);
static Date next_date = 0;
static uint32 next_date_fract;
static CommandPacket *cp = nullptr;
static bool check_sync_state = false;
static uint32 sync_state[2];
if (f == nullptr && next_date == 0) {
Debug(desync, 0, "Cannot open commands.log");
next_date = 1;
}
while (f != nullptr && !feof(f)) {
if (_date == next_date && _date_fract == next_date_fract) {
if (cp != nullptr) {
NetworkSendCommand(cp->tile, cp->p1, cp->p2, cp->cmd & ~CMD_FLAGS_MASK, nullptr, cp->text, cp->company);
Debug(desync, 0, "Injecting: {:08x}; {:02x}; {:02x}; {:06x}; {:08x}; {:08x}; {:08x}; \"{}\" ({})", _date, _date_fract, (int)_current_company, cp->tile, cp->p1, cp->p2, cp->cmd, cp->text, GetCommandName(cp->cmd));
delete cp;
cp = nullptr;
}
if (check_sync_state) {
if (sync_state[0] == _random.state[0] && sync_state[1] == _random.state[1]) {
Debug(desync, 0, "Sync check: {:08x}; {:02x}; match", _date, _date_fract);
} else {
Debug(desync, 0, "Sync check: {:08x}; {:02x}; mismatch expected {{:08x}, {:08x}}, got {{:08x}, {:08x}}",
_date, _date_fract, sync_state[0], sync_state[1], _random.state[0], _random.state[1]);
NOT_REACHED();
}
check_sync_state = false;
}
}
if (cp != nullptr || check_sync_state) break;
char buff[4096];
if (fgets(buff, lengthof(buff), f) == nullptr) break;
char *p = buff;
/* Ignore the "[date time] " part of the message */
if (*p == '[') {
p = strchr(p, ']');
if (p == nullptr) break;
p += 2;
}
if (strncmp(p, "cmd: ", 5) == 0
#ifdef DEBUG_FAILED_DUMP_COMMANDS
|| strncmp(p, "cmdf: ", 6) == 0
#endif
) {
p += 5;
if (*p == ' ') p++;
cp = new CommandPacket();
int company;
char buffer[128];
int ret = sscanf(p, "%x; %x; %x; %x; %x; %x; %x; \"%127[^\"]\"", &next_date, &next_date_fract, &company, &cp->tile, &cp->p1, &cp->p2, &cp->cmd, buffer);
cp->text = buffer;
/* There are 8 pieces of data to read, however the last is a
* string that might or might not exist. Ignore it if that
* string misses because in 99% of the time it's not used. */
assert(ret == 8 || ret == 7);
cp->company = (CompanyID)company;
} else if (strncmp(p, "join: ", 6) == 0) {
/* Manually insert a pause when joining; this way the client can join at the exact right time. */
int ret = sscanf(p + 6, "%x; %x", &next_date, &next_date_fract);
assert(ret == 2);
Debug(desync, 0, "Injecting pause for join at {:08x}:{:02x}; please join when paused", next_date, next_date_fract);
cp = new CommandPacket();
cp->company = COMPANY_SPECTATOR;
cp->cmd = CMD_PAUSE;
cp->p1 = PM_PAUSED_NORMAL;
cp->p2 = 1;
_ddc_fastforward = false;
} else if (strncmp(p, "sync: ", 6) == 0) {
int ret = sscanf(p + 6, "%x; %x; %x; %x", &next_date, &next_date_fract, &sync_state[0], &sync_state[1]);
assert(ret == 4);
check_sync_state = true;
} else if (strncmp(p, "msg: ", 5) == 0 || strncmp(p, "client: ", 8) == 0 ||
strncmp(p, "load: ", 6) == 0 || strncmp(p, "save: ", 6) == 0) {
/* A message that is not very important to the log playback, but part of the log. */
#ifndef DEBUG_FAILED_DUMP_COMMANDS
} else if (strncmp(p, "cmdf: ", 6) == 0) {
Debug(desync, 0, "Skipping replay of failed command: {}", p + 6);
#endif
} else {
/* Can't parse a line; what's wrong here? */
Debug(desync, 0, "Trying to parse: {}", p);
NOT_REACHED();
}
}
if (f != nullptr && feof(f)) {
Debug(desync, 0, "End of commands.log");
fclose(f);
f = nullptr;
}
#endif /* DEBUG_DUMP_COMMANDS */
if (_frame_counter >= _frame_counter_max) {
/* Only check for active clients just before we're going to send out
* the commands so we don't send multiple pause/unpause commands when
* the frame_freq is more than 1 tick. Same with distributing commands. */
CheckPauseOnJoin();
CheckMinActiveClients();
NetworkDistributeCommands();
}
bool send_frame = false;
/* We first increase the _frame_counter */
_frame_counter++;
/* Update max-frame-counter */
if (_frame_counter > _frame_counter_max) {
_frame_counter_max = _frame_counter + _settings_client.network.frame_freq;
send_frame = true;
}
NetworkExecuteLocalCommandQueue();
/* Then we make the frame */
StateGameLoop();
_sync_seed_1 = _random.state[0];
#ifdef NETWORK_SEND_DOUBLE_SEED
_sync_seed_2 = _random.state[1];
#endif
NetworkServer_Tick(send_frame);
} else {
/* Client */
/* Make sure we are at the frame were the server is (quick-frames) */
if (_frame_counter_server > _frame_counter) {
/* Run a number of frames; when things go bad, get out. */
while (_frame_counter_server > _frame_counter) {
if (!ClientNetworkGameSocketHandler::GameLoop()) return;
}
} else {
/* Else, keep on going till _frame_counter_max */
if (_frame_counter_max > _frame_counter) {
/* Run one frame; if things went bad, get out. */
if (!ClientNetworkGameSocketHandler::GameLoop()) return;
}
}
}
NetworkSend();
}
static void NetworkGenerateServerId()
{
Md5 checksum;
uint8 digest[16];
char hex_output[16 * 2 + 1];
char coding_string[NETWORK_NAME_LENGTH];
int di;
seprintf(coding_string, lastof(coding_string), "%d%s", (uint)Random(), "OpenTTD Server ID");
/* Generate the MD5 hash */
checksum.Append((const uint8*)coding_string, strlen(coding_string));
checksum.Finish(digest);
for (di = 0; di < 16; ++di) {
seprintf(hex_output + di * 2, lastof(hex_output), "%02x", digest[di]);
}
/* _settings_client.network.network_id is our id */
_settings_client.network.network_id = hex_output;
}
class TCPNetworkDebugConnecter : TCPConnecter {
private:
std::string connection_string;
public:
TCPNetworkDebugConnecter(const std::string &connection_string) : TCPConnecter(connection_string, NETWORK_DEFAULT_DEBUGLOG_PORT), connection_string(connection_string) {}
void OnFailure() override
{
Debug(net, 0, "Failed to open connection to {} for redirecting Debug()", this->connection_string);
}
void OnConnect(SOCKET s) override
{
Debug(net, 3, "Redirecting Debug() to {}", this->connection_string);
extern SOCKET _debug_socket;
_debug_socket = s;
}
};
void NetworkStartDebugLog(const std::string &connection_string)
{
new TCPNetworkDebugConnecter(connection_string);
}
/** This tries to launch the network for a given OS */
void NetworkStartUp()
{
Debug(net, 3, "Starting network");
/* Network is available */
_network_available = NetworkCoreInitialize();
_network_dedicated = false;
_network_need_advertise = true;
/* Generate an server id when there is none yet */
if (_settings_client.network.network_id.empty()) NetworkGenerateServerId();
_network_game_info = {};
NetworkInitialize();
Debug(net, 3, "Network online, multiplayer available");
NetworkFindBroadcastIPs(&_broadcast_list);
}
/** This shuts the network down */
void NetworkShutDown()
{
NetworkDisconnect(true);
NetworkUDPClose();
Debug(net, 3, "Shutting down network");
_network_available = false;
NetworkCoreShutdown();
}
#ifdef __EMSCRIPTEN__
extern "C" {
void CDECL em_openttd_add_server(const char *connection_string)
{
NetworkAddServer(connection_string, false, true);
}
}
#endif
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