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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_query.cpp Query part of the network protocol. */
#include "../stdafx.h"
#include "core/game_info.h"
#include "network_query.h"
#include "network_gamelist.h"
#include "../error.h"
#include "table/strings.h"
#include "../safeguards.h"
std::vector<std::unique_ptr<QueryNetworkGameSocketHandler>> QueryNetworkGameSocketHandler::queries = {};
NetworkRecvStatus QueryNetworkGameSocketHandler::CloseConnection(NetworkRecvStatus status)
{
assert(status != NETWORK_RECV_STATUS_OKAY);
assert(this->sock != INVALID_SOCKET);
return status;
}
/**
* Check the connection's state, i.e. is the connection still up?
*/
bool QueryNetworkGameSocketHandler::CheckConnection()
{
std::chrono::steady_clock::duration lag = std::chrono::steady_clock::now() - this->last_packet;
/* If there was no response in 5 seconds, terminate the query. */
if (lag > std::chrono::seconds(5)) {
this->CloseConnection(NETWORK_RECV_STATUS_CONNECTION_LOST);
return false;
}
return true;
}
/**
* Check whether we received/can send some data from/to the server and
* when that's the case handle it appropriately.
* @return true when everything went okay.
*/
bool QueryNetworkGameSocketHandler::Receive()
{
if (this->CanSendReceive()) {
NetworkRecvStatus res = this->ReceivePackets();
if (res != NETWORK_RECV_STATUS_OKAY) {
this->CloseConnection(res);
return false;
}
}
return true;
}
/** Send the packets of this socket handler. */
void QueryNetworkGameSocketHandler::Send()
{
this->SendPackets();
}
/**
* Query the server for server information.
*/
NetworkRecvStatus QueryNetworkGameSocketHandler::SendGameInfo()
{
this->SendPacket(new Packet(PACKET_CLIENT_GAME_INFO));
return NETWORK_RECV_STATUS_OKAY;
}
NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_FULL(Packet *p)
{
NetworkGameList *item = NetworkGameListAddItem(this->connection_string);
item->status = NGLS_FULL;
UpdateNetworkGameWindow();
return NETWORK_RECV_STATUS_CLOSE_QUERY;
}
NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_BANNED(Packet *p)
{
NetworkGameList *item = NetworkGameListAddItem(this->connection_string);
item->status = NGLS_BANNED;
UpdateNetworkGameWindow();
return NETWORK_RECV_STATUS_CLOSE_QUERY;
}
NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_GAME_INFO(Packet *p)
{
NetworkGameList *item = NetworkGameListAddItem(this->connection_string);
/* Clear any existing GRFConfig chain. */
ClearGRFConfigList(&item->info.grfconfig);
/* Retrieve the NetworkGameInfo from the packet. */
DeserializeNetworkGameInfo(p, &item->info);
/* Check for compatability with the client. */
CheckGameCompatibility(item->info);
/* Ensure we consider the server online. */
item->status = NGLS_ONLINE;
UpdateNetworkGameWindow();
return NETWORK_RECV_STATUS_CLOSE_QUERY;
}
NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_ERROR(Packet *p)
{
NetworkErrorCode error = (NetworkErrorCode)p->Recv_uint8();
NetworkGameList *item = NetworkGameListAddItem(this->connection_string);
if (error == NETWORK_ERROR_NOT_EXPECTED) {
/* If we query a server that is 1.11.1 or older, we get an
* NETWORK_ERROR_NOT_EXPECTED on requesting the game info. Show to the
* user this server is too old to query.
*/
item->status = NGLS_TOO_OLD;
} else {
item->status = NGLS_OFFLINE;
}
UpdateNetworkGameWindow();
return NETWORK_RECV_STATUS_CLOSE_QUERY;
}
/**
* Check if any query needs to send or receive.
*/
/* static */ void QueryNetworkGameSocketHandler::SendReceive()
{
for (auto it = QueryNetworkGameSocketHandler::queries.begin(); it != QueryNetworkGameSocketHandler::queries.end(); /* nothing */) {
if (!(*it)->Receive()) {
it = QueryNetworkGameSocketHandler::queries.erase(it);
} else if (!(*it)->CheckConnection()) {
it = QueryNetworkGameSocketHandler::queries.erase(it);
} else {
it++;
}
}
for (auto &query : QueryNetworkGameSocketHandler::queries) {
query->Send();
}
}
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