1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
* 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 tcp_game.cpp Basic functions to receive and send TCP packets for game purposes.
*/
#include "../../stdafx.h"
#include "../network.h"
#include "../network_internal.h"
#include "../../debug.h"
#include "../../error.h"
#include "table/strings.h"
#include "../../safeguards.h"
/**
* Create a new socket for the game connection.
* @param s The socket to connect with.
*/
NetworkGameSocketHandler::NetworkGameSocketHandler(SOCKET s) : info(nullptr), client_id(INVALID_CLIENT_ID),
last_frame(_frame_counter), last_frame_server(_frame_counter)
{
this->sock = s;
this->last_packet = std::chrono::steady_clock::now();
}
/**
* Functions to help ReceivePacket/SendPacket a bit
* A socket can make errors. When that happens this handles what to do.
* For clients: close connection and drop back to main-menu
* For servers: close connection and that is it
* @return the new status
*/
NetworkRecvStatus NetworkGameSocketHandler::CloseConnection(bool error)
{
/* Clients drop back to the main menu */
if (!_network_server && _networking) {
extern void ClientNetworkEmergencySave(); // from network_client.cpp
ClientNetworkEmergencySave();
_switch_mode = SM_MENU;
_networking = false;
ShowErrorMessage(STR_NETWORK_ERROR_LOSTCONNECTION, INVALID_STRING_ID, WL_CRITICAL);
return NETWORK_RECV_STATUS_CLIENT_QUIT;
}
return this->CloseConnection(NETWORK_RECV_STATUS_CONNECTION_LOST);
}
/**
* Handle the given packet, i.e. pass it to the right parser receive command.
* @param p the packet to handle
* @return #NetworkRecvStatus of handling.
*/
NetworkRecvStatus NetworkGameSocketHandler::HandlePacket(Packet *p)
{
PacketGameType type = (PacketGameType)p->Recv_uint8();
this->last_packet = std::chrono::steady_clock::now();
switch (this->HasClientQuit() ? PACKET_END : type) {
case PACKET_SERVER_FULL: return this->Receive_SERVER_FULL(p);
case PACKET_SERVER_BANNED: return this->Receive_SERVER_BANNED(p);
case PACKET_CLIENT_JOIN: return this->Receive_CLIENT_JOIN(p);
case PACKET_SERVER_ERROR: return this->Receive_SERVER_ERROR(p);
case PACKET_CLIENT_GAME_INFO: return this->Receive_CLIENT_GAME_INFO(p);
case PACKET_SERVER_GAME_INFO: return this->Receive_SERVER_GAME_INFO(p);
case PACKET_CLIENT_COMPANY_INFO: return this->Receive_CLIENT_COMPANY_INFO(p);
case PACKET_SERVER_COMPANY_INFO: return this->Receive_SERVER_COMPANY_INFO(p);
case PACKET_SERVER_CLIENT_INFO: return this->Receive_SERVER_CLIENT_INFO(p);
case PACKET_SERVER_NEED_GAME_PASSWORD: return this->Receive_SERVER_NEED_GAME_PASSWORD(p);
case PACKET_SERVER_NEED_COMPANY_PASSWORD: return this->Receive_SERVER_NEED_COMPANY_PASSWORD(p);
case PACKET_CLIENT_GAME_PASSWORD: return this->Receive_CLIENT_GAME_PASSWORD(p);
case PACKET_CLIENT_COMPANY_PASSWORD: return this->Receive_CLIENT_COMPANY_PASSWORD(p);
case PACKET_SERVER_WELCOME: return this->Receive_SERVER_WELCOME(p);
case PACKET_CLIENT_GETMAP: return this->Receive_CLIENT_GETMAP(p);
case PACKET_SERVER_WAIT: return this->Receive_SERVER_WAIT(p);
case PACKET_SERVER_MAP_BEGIN: return this->Receive_SERVER_MAP_BEGIN(p);
case PACKET_SERVER_MAP_SIZE: return this->Receive_SERVER_MAP_SIZE(p);
case PACKET_SERVER_MAP_DATA: return this->Receive_SERVER_MAP_DATA(p);
case PACKET_SERVER_MAP_DONE: return this->Receive_SERVER_MAP_DONE(p);
case PACKET_CLIENT_MAP_OK: return this->Receive_CLIENT_MAP_OK(p);
case PACKET_SERVER_JOIN: return this->Receive_SERVER_JOIN(p);
case PACKET_SERVER_FRAME: return this->Receive_SERVER_FRAME(p);
case PACKET_SERVER_SYNC: return this->Receive_SERVER_SYNC(p);
case PACKET_CLIENT_ACK: return this->Receive_CLIENT_ACK(p);
case PACKET_CLIENT_COMMAND: return this->Receive_CLIENT_COMMAND(p);
case PACKET_SERVER_COMMAND: return this->Receive_SERVER_COMMAND(p);
case PACKET_CLIENT_CHAT: return this->Receive_CLIENT_CHAT(p);
case PACKET_SERVER_CHAT: return this->Receive_SERVER_CHAT(p);
case PACKET_CLIENT_SET_PASSWORD: return this->Receive_CLIENT_SET_PASSWORD(p);
case PACKET_CLIENT_SET_NAME: return this->Receive_CLIENT_SET_NAME(p);
case PACKET_CLIENT_QUIT: return this->Receive_CLIENT_QUIT(p);
case PACKET_CLIENT_ERROR: return this->Receive_CLIENT_ERROR(p);
case PACKET_SERVER_QUIT: return this->Receive_SERVER_QUIT(p);
case PACKET_SERVER_ERROR_QUIT: return this->Receive_SERVER_ERROR_QUIT(p);
case PACKET_SERVER_SHUTDOWN: return this->Receive_SERVER_SHUTDOWN(p);
case PACKET_SERVER_NEWGAME: return this->Receive_SERVER_NEWGAME(p);
case PACKET_SERVER_RCON: return this->Receive_SERVER_RCON(p);
case PACKET_CLIENT_RCON: return this->Receive_CLIENT_RCON(p);
case PACKET_SERVER_CHECK_NEWGRFS: return this->Receive_SERVER_CHECK_NEWGRFS(p);
case PACKET_CLIENT_NEWGRFS_CHECKED: return this->Receive_CLIENT_NEWGRFS_CHECKED(p);
case PACKET_SERVER_MOVE: return this->Receive_SERVER_MOVE(p);
case PACKET_CLIENT_MOVE: return this->Receive_CLIENT_MOVE(p);
case PACKET_SERVER_COMPANY_UPDATE: return this->Receive_SERVER_COMPANY_UPDATE(p);
case PACKET_SERVER_CONFIG_UPDATE: return this->Receive_SERVER_CONFIG_UPDATE(p);
default:
this->CloseConnection();
if (this->HasClientQuit()) {
DEBUG(net, 0, "[tcp/game] Received invalid packet type %d from client %d", type, this->client_id);
} else {
DEBUG(net, 0, "[tcp/game] Received illegal packet from client %d", this->client_id);
}
return NETWORK_RECV_STATUS_MALFORMED_PACKET;
}
}
/**
* Do the actual receiving of packets.
* As long as HandlePacket returns OKAY packets are handled. Upon
* failure, or no more packets to process the last result of
* HandlePacket is returned.
* @return #NetworkRecvStatus of the last handled packet.
*/
NetworkRecvStatus NetworkGameSocketHandler::ReceivePackets()
{
Packet *p;
while ((p = this->ReceivePacket()) != nullptr) {
NetworkRecvStatus res = HandlePacket(p);
delete p;
if (res != NETWORK_RECV_STATUS_OKAY) return res;
}
return NETWORK_RECV_STATUS_OKAY;
}
/**
* Helper for logging receiving invalid packets.
* @param type The received packet type.
* @return The status the network should have, in this case: "malformed packet error".
*/
NetworkRecvStatus NetworkGameSocketHandler::ReceiveInvalidPacket(PacketGameType type)
{
DEBUG(net, 0, "[tcp/game] Received illegal packet type %d from client %d", type, this->client_id);
return NETWORK_RECV_STATUS_MALFORMED_PACKET;
}
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_FULL(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_FULL); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_BANNED(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_BANNED); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_JOIN(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_JOIN); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_ERROR(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_ERROR); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_GAME_INFO(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_GAME_INFO); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_GAME_INFO(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_GAME_INFO); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_COMPANY_INFO(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_COMPANY_INFO); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_COMPANY_INFO(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_COMPANY_INFO); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CLIENT_INFO(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_CLIENT_INFO); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_NEED_GAME_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_NEED_GAME_PASSWORD); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_NEED_COMPANY_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_NEED_COMPANY_PASSWORD); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_GAME_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_GAME_PASSWORD); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_COMPANY_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_COMPANY_PASSWORD); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_WELCOME(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_WELCOME); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_GETMAP(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_GETMAP); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_WAIT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_WAIT); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_BEGIN(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_BEGIN); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_SIZE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_SIZE); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_DATA(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_DATA); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_DONE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_DONE); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_MAP_OK(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_MAP_OK); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_JOIN(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_JOIN); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_FRAME(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_FRAME); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_SYNC(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_SYNC); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_ACK(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_ACK); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_COMMAND(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_COMMAND); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_COMMAND(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_COMMAND); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_CHAT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_CHAT); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CHAT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_CHAT); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_SET_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_SET_PASSWORD); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_SET_NAME(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_SET_NAME); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_QUIT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_QUIT); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_ERROR(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_ERROR); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_QUIT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_QUIT); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_ERROR_QUIT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_ERROR_QUIT); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_SHUTDOWN(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_SHUTDOWN); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_NEWGAME(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_NEWGAME); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_RCON(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_RCON); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_RCON(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_RCON); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CHECK_NEWGRFS(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_CHECK_NEWGRFS); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_NEWGRFS_CHECKED(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_NEWGRFS_CHECKED); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MOVE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MOVE); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_MOVE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_MOVE); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_COMPANY_UPDATE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_COMPANY_UPDATE); }
NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CONFIG_UPDATE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_CONFIG_UPDATE); }
|
