OpenTTD Source  1.11.0-beta2
udp.cpp
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1 /*
2  * This file is part of OpenTTD.
3  * 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.
4  * 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.
5  * 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/>.
6  */
7 
12 #include "../../stdafx.h"
13 #include "../../date_func.h"
14 #include "../../debug.h"
15 #include "udp.h"
16 
17 #include "../../safeguards.h"
18 
24 {
25  if (bind != nullptr) {
26  for (NetworkAddress &addr : *bind) {
27  this->bind.push_back(addr);
28  }
29  } else {
30  /* As hostname nullptr and port 0/nullptr don't go well when
31  * resolving it we need to add an address for each of
32  * the address families we support. */
33  this->bind.emplace_back(nullptr, 0, AF_INET);
34  this->bind.emplace_back(nullptr, 0, AF_INET6);
35  }
36 }
37 
38 
44 {
45  /* Make sure socket is closed */
46  this->Close();
47 
48  for (NetworkAddress &addr : this->bind) {
49  addr.Listen(SOCK_DGRAM, &this->sockets);
50  }
51 
52  return this->sockets.size() != 0;
53 }
54 
59 {
60  for (auto &s : this->sockets) {
61  closesocket(s.second);
62  }
63  this->sockets.clear();
64 }
65 
67 {
70 }
71 
79 void NetworkUDPSocketHandler::SendPacket(Packet *p, NetworkAddress *recv, bool all, bool broadcast)
80 {
81  if (this->sockets.size() == 0) this->Listen();
82 
83  for (auto &s : this->sockets) {
84  /* Make a local copy because if we resolve it we cannot
85  * easily unresolve it so we can resolve it later again. */
86  NetworkAddress send(*recv);
87 
88  /* Not the same type */
89  if (!send.IsFamily(s.first.GetAddress()->ss_family)) continue;
90 
91  p->PrepareToSend();
92 
93  if (broadcast) {
94  /* Enable broadcast */
95  unsigned long val = 1;
96  if (setsockopt(s.second, SOL_SOCKET, SO_BROADCAST, (char *) &val, sizeof(val)) < 0) {
97  DEBUG(net, 1, "[udp] setting broadcast failed with: %i", GET_LAST_ERROR());
98  }
99  }
100 
101  /* Send the buffer */
102  int res = sendto(s.second, (const char*)p->buffer, p->size, 0, (const struct sockaddr *)send.GetAddress(), send.GetAddressLength());
103  DEBUG(net, 7, "[udp] sendto(%s)", send.GetAddressAsString().c_str());
104 
105  /* Check for any errors, but ignore it otherwise */
106  if (res == -1) DEBUG(net, 1, "[udp] sendto(%s) failed with: %i", send.GetAddressAsString().c_str(), GET_LAST_ERROR());
107 
108  if (!all) break;
109  }
110 }
111 
116 {
117  for (auto &s : this->sockets) {
118  for (int i = 0; i < 1000; i++) { // Do not infinitely loop when DoSing with UDP
119  struct sockaddr_storage client_addr;
120  memset(&client_addr, 0, sizeof(client_addr));
121 
122  Packet p(this);
123  socklen_t client_len = sizeof(client_addr);
124 
125  /* Try to receive anything */
126  SetNonBlocking(s.second); // Some OSes seem to lose the non-blocking status of the socket
127  int nbytes = recvfrom(s.second, (char*)p.buffer, SEND_MTU, 0, (struct sockaddr *)&client_addr, &client_len);
128 
129  /* Did we get the bytes for the base header of the packet? */
130  if (nbytes <= 0) break; // No data, i.e. no packet
131  if (nbytes <= 2) continue; // Invalid data; try next packet
132 #ifdef __EMSCRIPTEN__
133  client_len = FixAddrLenForEmscripten(client_addr);
134 #endif
135 
136  NetworkAddress address(client_addr, client_len);
137  p.PrepareToRead();
138 
139  /* If the size does not match the packet must be corrupted.
140  * Otherwise it will be marked as corrupted later on. */
141  if (nbytes != p.size) {
142  DEBUG(net, 1, "received a packet with mismatching size from %s", address.GetAddressAsString().c_str());
143  continue;
144  }
145 
146  /* Handle the packet */
147  this->HandleUDPPacket(&p, &address);
148  }
149  }
150 }
151 
152 
159 {
161 
162  /*
163  * Please observe the order.
164  * The parts must be read in the same order as they are sent!
165  */
166 
167  /* Update the documentation in udp.h on changes
168  * to the NetworkGameInfo wire-protocol! */
169 
170  /* NETWORK_GAME_INFO_VERSION = 4 */
171  {
172  /* Only send the GRF Identification (GRF_ID and MD5 checksum) of
173  * the GRFs that are needed, i.e. the ones that the server has
174  * selected in the NewGRF GUI and not the ones that are used due
175  * to the fact that they are in [newgrf-static] in openttd.cfg */
176  const GRFConfig *c;
177  uint count = 0;
178 
179  /* Count number of GRFs to send information about */
180  for (c = info->grfconfig; c != nullptr; c = c->next) {
181  if (!HasBit(c->flags, GCF_STATIC)) count++;
182  }
183  p->Send_uint8 (count); // Send number of GRFs
184 
185  /* Send actual GRF Identifications */
186  for (c = info->grfconfig; c != nullptr; c = c->next) {
187  if (!HasBit(c->flags, GCF_STATIC)) this->SendGRFIdentifier(p, &c->ident);
188  }
189  }
190 
191  /* NETWORK_GAME_INFO_VERSION = 3 */
192  p->Send_uint32(info->game_date);
193  p->Send_uint32(info->start_date);
194 
195  /* NETWORK_GAME_INFO_VERSION = 2 */
196  p->Send_uint8 (info->companies_max);
197  p->Send_uint8 (info->companies_on);
198  p->Send_uint8 (info->spectators_max);
199 
200  /* NETWORK_GAME_INFO_VERSION = 1 */
201  p->Send_string(info->server_name);
202  p->Send_string(info->server_revision);
203  p->Send_uint8 (info->server_lang);
204  p->Send_bool (info->use_password);
205  p->Send_uint8 (info->clients_max);
206  p->Send_uint8 (info->clients_on);
207  p->Send_uint8 (info->spectators_on);
208  p->Send_string(info->map_name);
209  p->Send_uint16(info->map_width);
210  p->Send_uint16(info->map_height);
211  p->Send_uint8 (info->map_set);
212  p->Send_bool (info->dedicated);
213 }
214 
221 {
222  static const Date MAX_DATE = ConvertYMDToDate(MAX_YEAR, 11, 31); // December is month 11
223 
224  info->game_info_version = p->Recv_uint8();
225 
226  /*
227  * Please observe the order.
228  * The parts must be read in the same order as they are sent!
229  */
230 
231  /* Update the documentation in udp.h on changes
232  * to the NetworkGameInfo wire-protocol! */
233 
234  switch (info->game_info_version) {
235  case 4: {
236  GRFConfig **dst = &info->grfconfig;
237  uint i;
238  uint num_grfs = p->Recv_uint8();
239 
240  /* Broken/bad data. It cannot have that many NewGRFs. */
241  if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
242 
243  for (i = 0; i < num_grfs; i++) {
244  GRFConfig *c = new GRFConfig();
245  this->ReceiveGRFIdentifier(p, &c->ident);
247 
248  /* Append GRFConfig to the list */
249  *dst = c;
250  dst = &c->next;
251  }
252  FALLTHROUGH;
253  }
254 
255  case 3:
256  info->game_date = Clamp(p->Recv_uint32(), 0, MAX_DATE);
257  info->start_date = Clamp(p->Recv_uint32(), 0, MAX_DATE);
258  FALLTHROUGH;
259 
260  case 2:
261  info->companies_max = p->Recv_uint8 ();
262  info->companies_on = p->Recv_uint8 ();
263  info->spectators_max = p->Recv_uint8 ();
264  FALLTHROUGH;
265 
266  case 1:
267  p->Recv_string(info->server_name, sizeof(info->server_name));
268  p->Recv_string(info->server_revision, sizeof(info->server_revision));
269  info->server_lang = p->Recv_uint8 ();
270  info->use_password = p->Recv_bool ();
271  info->clients_max = p->Recv_uint8 ();
272  info->clients_on = p->Recv_uint8 ();
273  info->spectators_on = p->Recv_uint8 ();
274  if (info->game_info_version < 3) { // 16 bits dates got scrapped and are read earlier
277  }
278  p->Recv_string(info->map_name, sizeof(info->map_name));
279  info->map_width = p->Recv_uint16();
280  info->map_height = p->Recv_uint16();
281  info->map_set = p->Recv_uint8 ();
282  info->dedicated = p->Recv_bool ();
283 
284  if (info->server_lang >= NETWORK_NUM_LANGUAGES) info->server_lang = 0;
285  if (info->map_set >= NETWORK_NUM_LANDSCAPES) info->map_set = 0;
286  }
287 }
288 
295 {
296  PacketUDPType type;
297 
298  /* New packet == new client, which has not quit yet */
299  this->Reopen();
300 
301  type = (PacketUDPType)p->Recv_uint8();
302 
303  switch (this->HasClientQuit() ? PACKET_UDP_END : type) {
304  case PACKET_UDP_CLIENT_FIND_SERVER: this->Receive_CLIENT_FIND_SERVER(p, client_addr); break;
305  case PACKET_UDP_SERVER_RESPONSE: this->Receive_SERVER_RESPONSE(p, client_addr); break;
306  case PACKET_UDP_CLIENT_DETAIL_INFO: this->Receive_CLIENT_DETAIL_INFO(p, client_addr); break;
307  case PACKET_UDP_SERVER_DETAIL_INFO: this->Receive_SERVER_DETAIL_INFO(p, client_addr); break;
308  case PACKET_UDP_SERVER_REGISTER: this->Receive_SERVER_REGISTER(p, client_addr); break;
309  case PACKET_UDP_MASTER_ACK_REGISTER: this->Receive_MASTER_ACK_REGISTER(p, client_addr); break;
310  case PACKET_UDP_CLIENT_GET_LIST: this->Receive_CLIENT_GET_LIST(p, client_addr); break;
311  case PACKET_UDP_MASTER_RESPONSE_LIST: this->Receive_MASTER_RESPONSE_LIST(p, client_addr); break;
312  case PACKET_UDP_SERVER_UNREGISTER: this->Receive_SERVER_UNREGISTER(p, client_addr); break;
313  case PACKET_UDP_CLIENT_GET_NEWGRFS: this->Receive_CLIENT_GET_NEWGRFS(p, client_addr); break;
314  case PACKET_UDP_SERVER_NEWGRFS: this->Receive_SERVER_NEWGRFS(p, client_addr); break;
315  case PACKET_UDP_MASTER_SESSION_KEY: this->Receive_MASTER_SESSION_KEY(p, client_addr); break;
316 
317  default:
318  if (this->HasClientQuit()) {
319  DEBUG(net, 0, "[udp] received invalid packet type %d from %s", type, client_addr->GetAddressAsString().c_str());
320  } else {
321  DEBUG(net, 0, "[udp] received illegal packet from %s", client_addr->GetAddressAsString().c_str());
322  }
323  break;
324  }
325 }
326 
333 {
334  DEBUG(net, 0, "[udp] received packet type %d on wrong port from %s", type, client_addr->GetAddressAsString().c_str());
335 }
336 
NetworkGameInfo
The game information that is sent from the server to the clients.
Definition: game.h:32
PACKET_UDP_CLIENT_GET_LIST
@ PACKET_UDP_CLIENT_GET_LIST
Request for serverlist from master server.
Definition: udp.h:27
NetworkUDPSocketHandler::Receive_SERVER_UNREGISTER
virtual void Receive_SERVER_UNREGISTER(Packet *p, NetworkAddress *client_addr)
A server unregisters itself at the master server.
Definition: udp.cpp:345
Packet::PrepareToSend
void PrepareToSend()
Writes the packet size from the raw packet from packet->size.
Definition: packet.cpp:61
PACKET_UDP_CLIENT_DETAIL_INFO
@ PACKET_UDP_CLIENT_DETAIL_INFO
Queries a game server about details of the game, such as companies.
Definition: udp.h:23
NetworkUDPSocketHandler::Receive_MASTER_SESSION_KEY
virtual void Receive_MASTER_SESSION_KEY(Packet *p, NetworkAddress *client_addr)
The master server sends us a session key.
Definition: udp.cpp:348
Packet::Recv_string
void Recv_string(char *buffer, size_t size, StringValidationSettings settings=SVS_REPLACE_WITH_QUESTION_MARK)
Reads a string till it finds a '\0' in the stream.
Definition: packet.cpp:286
NetworkAddress::GetAddress
const sockaddr_storage * GetAddress()
Get the address in its internal representation.
Definition: address.cpp:123
PACKET_UDP_CLIENT_GET_NEWGRFS
@ PACKET_UDP_CLIENT_GET_NEWGRFS
Requests the name for a list of GRFs (GRF_ID and MD5)
Definition: udp.h:30
NetworkGameInfo::companies_max
byte companies_max
Max companies allowed on server.
Definition: game.h:49
NetworkUDPSocketHandler::Receive_MASTER_RESPONSE_LIST
virtual void Receive_MASTER_RESPONSE_LIST(Packet *p, NetworkAddress *client_addr)
The server sends a list of servers.
Definition: udp.cpp:344
Packet::buffer
byte * buffer
The buffer of this packet, of basically variable length up to SEND_MTU.
Definition: packet.h:52
NetworkAddress::GetAddressLength
int GetAddressLength()
Get the (valid) length of the address.
Definition: address.h:103
NETWORK_NUM_LANDSCAPES
static const uint NETWORK_NUM_LANDSCAPES
The number of landscapes in OpenTTD.
Definition: config.h:70
PACKET_UDP_CLIENT_FIND_SERVER
@ PACKET_UDP_CLIENT_FIND_SERVER
Queries a game server for game information.
Definition: udp.h:21
NETWORK_NUM_LANGUAGES
static const uint NETWORK_NUM_LANGUAGES
Number of known languages (to the network protocol) + 1 for 'any'.
Definition: config.h:60
PACKET_UDP_SERVER_UNREGISTER
@ PACKET_UDP_SERVER_UNREGISTER
Request to be removed from the server-list.
Definition: udp.h:29
NetworkServerGameInfo::map_name
char map_name[NETWORK_NAME_LENGTH]
Map which is played ["random" for a randomized map].
Definition: game.h:25
HasBit
static bool HasBit(const T x, const uint8 y)
Checks if a bit in a value is set.
Definition: bitmath_func.hpp:103
PACKET_UDP_SERVER_REGISTER
@ PACKET_UDP_SERVER_REGISTER
Packet to register itself to the master server.
Definition: udp.h:25
NetworkUDPSocketHandler::CloseConnection
NetworkRecvStatus CloseConnection(bool error=true) override
Close the current connection; for TCP this will be mostly equivalent to Close(), but for UDP it just ...
Definition: udp.cpp:66
NetworkGameInfo::use_password
bool use_password
Is this server passworded?
Definition: game.h:44
NetworkUDPSocketHandler::Close
void Close() override
Close the given UDP socket.
Definition: udp.cpp:58
NetworkGameInfo::game_info_version
byte game_info_version
Version of the game info.
Definition: game.h:45
GRFConfig::ident
GRFIdentifier ident
grfid and md5sum to uniquely identify newgrfs
Definition: newgrf_config.h:157
NetworkUDPSocketHandler::Receive_SERVER_NEWGRFS
virtual void Receive_SERVER_NEWGRFS(Packet *p, NetworkAddress *client_addr)
The server returns information about some NewGRFs.
Definition: udp.cpp:347
NetworkUDPSocketHandler::NetworkUDPSocketHandler
NetworkUDPSocketHandler(NetworkAddressList *bind=nullptr)
Create an UDP socket but don't listen yet.
Definition: udp.cpp:23
NetworkUDPSocketHandler::Receive_SERVER_REGISTER
virtual void Receive_SERVER_REGISTER(Packet *p, NetworkAddress *client_addr)
Registers the server to the master server.
Definition: udp.cpp:341
NetworkGameInfo::map_width
uint16 map_width
Map width.
Definition: game.h:36
NetworkSocketHandler::CloseConnection
virtual NetworkRecvStatus CloseConnection(bool error=true)
Close the current connection; for TCP this will be mostly equivalent to Close(), but for UDP it just ...
Definition: core.h:59
Packet::Send_uint8
void Send_uint8(uint8 data)
Package a 8 bits integer in the packet.
Definition: packet.cpp:96
NetworkUDPSocketHandler::Receive_CLIENT_FIND_SERVER
virtual void Receive_CLIENT_FIND_SERVER(Packet *p, NetworkAddress *client_addr)
Queries to the server for information about the game.
Definition: udp.cpp:337
Packet::Send_uint32
void Send_uint32(uint32 data)
Package a 32 bits integer in the packet.
Definition: packet.cpp:117
PACKET_UDP_MASTER_SESSION_KEY
@ PACKET_UDP_MASTER_SESSION_KEY
Sends a fresh session key to the client.
Definition: udp.h:32
NetworkUDPSocketHandler::HandleIncomingNetworkGameInfoGRFConfig
virtual void HandleIncomingNetworkGameInfoGRFConfig(GRFConfig *config)
Function that is called for every GRFConfig that is read when receiving a NetworkGameInfo.
Definition: udp.h:228
SetNonBlocking
static bool SetNonBlocking(SOCKET d)
Try to set the socket into non-blocking mode.
Definition: os_abstraction.h:181
NETWORK_MAX_GRF_COUNT
static const uint NETWORK_MAX_GRF_COUNT
Maximum number of GRFs that can be sent.
Definition: config.h:58
NetworkGameInfo::start_date
Date start_date
When the game started.
Definition: game.h:34
NetworkUDPSocketHandler::Receive_SERVER_DETAIL_INFO
virtual void Receive_SERVER_DETAIL_INFO(Packet *p, NetworkAddress *client_addr)
Reply with detailed company information.
Definition: udp.cpp:340
NetworkGameInfo::server_lang
byte server_lang
Language of the server (we should make a nice table for this)
Definition: game.h:46
Packet::Recv_uint32
uint32 Recv_uint32()
Read a 32 bits integer from the packet.
Definition: packet.cpp:246
NetworkSocketHandler::Reopen
void Reopen()
Reopen the socket so we can send/receive stuff again.
Definition: core.h:72
GRFConfig
Information about GRF, used in the game and (part of it) in savegames.
Definition: newgrf_config.h:152
NetworkAddressList
std::vector< NetworkAddress > NetworkAddressList
Type for a list of addresses.
Definition: address.h:20
NetworkGameInfo::companies_on
byte companies_on
How many started companies do we have.
Definition: game.h:48
DEBUG
#define DEBUG(name, level,...)
Output a line of debugging information.
Definition: debug.h:35
Packet::Send_string
void Send_string(const char *data)
Sends a string over the network.
Definition: packet.cpp:148
NetworkUDPSocketHandler::Receive_CLIENT_GET_NEWGRFS
virtual void Receive_CLIENT_GET_NEWGRFS(Packet *p, NetworkAddress *client_addr)
The client requests information about some NewGRFs.
Definition: udp.cpp:346
GRFConfig::flags
uint8 flags
NOSAVE: GCF_Flags, bitset.
Definition: newgrf_config.h:167
Packet::PrepareToRead
void PrepareToRead()
Prepares the packet so it can be read.
Definition: packet.cpp:196
ConvertYMDToDate
Date ConvertYMDToDate(Year year, Month month, Day day)
Converts a tuple of Year, Month and Day to a Date.
Definition: date.cpp:149
NetworkUDPSocketHandler::sockets
SocketList sockets
The opened sockets.
Definition: udp.h:51
NetworkSocketHandler::SendGRFIdentifier
void SendGRFIdentifier(Packet *p, const GRFIdentifier *grf)
Serializes the GRFIdentifier (GRF ID and MD5 checksum) to the packet.
Definition: core.cpp:57
Packet::size
PacketSize size
The size of the whole packet for received packets.
Definition: packet.h:48
PACKET_UDP_END
@ PACKET_UDP_END
Must ALWAYS be on the end of this list!! (period)
Definition: udp.h:33
Date
int32 Date
The type to store our dates in.
Definition: date_type.h:14
SEND_MTU
static const uint16 SEND_MTU
Number of bytes we can pack in a single packet.
Definition: config.h:33
NetworkUDPSocketHandler::bind
NetworkAddressList bind
The address to bind to.
Definition: udp.h:49
Packet::Send_uint16
void Send_uint16(uint16 data)
Package a 16 bits integer in the packet.
Definition: packet.cpp:106
PACKET_UDP_MASTER_ACK_REGISTER
@ PACKET_UDP_MASTER_ACK_REGISTER
Packet indicating registration has succeeded.
Definition: udp.h:26
PACKET_UDP_SERVER_DETAIL_INFO
@ PACKET_UDP_SERVER_DETAIL_INFO
Reply of the game server about details of the game, such as companies.
Definition: udp.h:24
NetworkUDPSocketHandler::SendNetworkGameInfo
void SendNetworkGameInfo(Packet *p, const NetworkGameInfo *info)
Serializes the NetworkGameInfo struct to the packet.
Definition: udp.cpp:158
NetworkUDPSocketHandler::ReceiveNetworkGameInfo
void ReceiveNetworkGameInfo(Packet *p, NetworkGameInfo *info)
Deserializes the NetworkGameInfo struct from the packet.
Definition: udp.cpp:220
Packet
Internal entity of a packet.
Definition: packet.h:40
NetworkGameInfo::server_name
char server_name[NETWORK_NAME_LENGTH]
Server name.
Definition: game.h:38
NetworkUDPSocketHandler::ReceiveInvalidPacket
void ReceiveInvalidPacket(PacketUDPType, NetworkAddress *client_addr)
Helper for logging receiving invalid packets.
Definition: udp.cpp:332
PACKET_UDP_SERVER_NEWGRFS
@ PACKET_UDP_SERVER_NEWGRFS
Sends the list of NewGRF's requested.
Definition: udp.h:31
PACKET_UDP_SERVER_RESPONSE
@ PACKET_UDP_SERVER_RESPONSE
Reply of the game server with game information.
Definition: udp.h:22
Packet::Send_bool
void Send_bool(bool data)
Package a boolean in the packet.
Definition: packet.cpp:87
NetworkSocketHandler::HasClientQuit
bool HasClientQuit() const
Whether the current client connected to the socket has quit.
Definition: core.h:67
NetworkAddress
Wrapper for (un)resolved network addresses; there's no reason to transform a numeric IP to a string a...
Definition: address.h:29
Clamp
static T Clamp(const T a, const T min, const T max)
Clamp a value between an interval.
Definition: math_func.hpp:77
NetworkUDPSocketHandler::Receive_MASTER_ACK_REGISTER
virtual void Receive_MASTER_ACK_REGISTER(Packet *p, NetworkAddress *client_addr)
The master server acknowledges the registration.
Definition: udp.cpp:342
NetworkGameInfo::clients_max
byte clients_max
Max clients allowed on server.
Definition: game.h:47
Packet::Recv_bool
bool Recv_bool()
Read a boolean from the packet.
Definition: packet.cpp:208
NetworkRecvStatus
NetworkRecvStatus
Status of a network client; reasons why a client has quit.
Definition: core.h:22
NetworkUDPSocketHandler::HandleUDPPacket
void HandleUDPPacket(Packet *p, NetworkAddress *client_addr)
Handle an incoming packets by sending it to the correct function.
Definition: udp.cpp:294
GRFConfig::next
struct GRFConfig * next
NOSAVE: Next item in the linked list.
Definition: newgrf_config.h:177
NetworkUDPSocketHandler::Listen
bool Listen()
Start listening on the given host and port.
Definition: udp.cpp:43
udp.h
Packet::Recv_uint8
uint8 Recv_uint8()
Read a 8 bits integer from the packet.
Definition: packet.cpp:217
NetworkGameInfo::game_date
Date game_date
Current date.
Definition: game.h:35
error
void CDECL error(const char *s,...)
Error handling for fatal non-user errors.
Definition: openttd.cpp:129
NetworkSocketHandler::ReceiveGRFIdentifier
void ReceiveGRFIdentifier(Packet *p, GRFIdentifier *grf)
Deserializes the GRFIdentifier (GRF ID and MD5 checksum) from the packet.
Definition: core.cpp:71
NetworkUDPSocketHandler::Receive_CLIENT_GET_LIST
virtual void Receive_CLIENT_GET_LIST(Packet *p, NetworkAddress *client_addr)
The client requests a list of servers.
Definition: udp.cpp:343
NetworkGameInfo::server_revision
char server_revision[NETWORK_REVISION_LENGTH]
The version number the server is using (e.g.: 'r304' or 0.5.0)
Definition: game.h:40
PACKET_UDP_MASTER_RESPONSE_LIST
@ PACKET_UDP_MASTER_RESPONSE_LIST
Response from master server with server ip's + port's.
Definition: udp.h:28
NetworkAddress::IsFamily
bool IsFamily(int family)
Checks of this address is of the given family.
Definition: address.cpp:142
NetworkUDPSocketHandler::Receive_CLIENT_DETAIL_INFO
virtual void Receive_CLIENT_DETAIL_INFO(Packet *p, NetworkAddress *client_addr)
Query for detailed information about companies.
Definition: udp.cpp:339
NetworkGameInfo::spectators_on
byte spectators_on
How many spectators do we have?
Definition: game.h:50
NetworkUDPSocketHandler::ReceivePackets
void ReceivePackets()
Receive a packet at UDP level.
Definition: udp.cpp:115
NETWORK_RECV_STATUS_OKAY
@ NETWORK_RECV_STATUS_OKAY
Everything is okay.
Definition: core.h:23
NetworkUDPSocketHandler::Receive_SERVER_RESPONSE
virtual void Receive_SERVER_RESPONSE(Packet *p, NetworkAddress *client_addr)
Return of server information to the client.
Definition: udp.cpp:338
NETWORK_GAME_INFO_VERSION
static const byte NETWORK_GAME_INFO_VERSION
What version of game-info do we use?
Definition: config.h:36
NetworkGameInfo::map_height
uint16 map_height
Map height.
Definition: game.h:37
NetworkServerGameInfo::clients_on
byte clients_on
Current count of clients on server.
Definition: game.h:26
NetworkGameInfo::grfconfig
GRFConfig * grfconfig
List of NewGRF files used.
Definition: game.h:33
PacketUDPType
PacketUDPType
Enum with all types of UDP packets.
Definition: udp.h:20
NetworkAddress::GetAddressAsString
void GetAddressAsString(char *buffer, const char *last, bool with_family=true)
Get the address as a string, e.g.
Definition: address.cpp:77
NetworkUDPSocketHandler::SendPacket
void SendPacket(Packet *p, NetworkAddress *recv, bool all=false, bool broadcast=false)
Send a packet over UDP.
Definition: udp.cpp:79
GCF_STATIC
@ GCF_STATIC
GRF file is used statically (can be used in any MP game)
Definition: newgrf_config.h:25
NetworkGameInfo::dedicated
bool dedicated
Is this a dedicated server?
Definition: game.h:41
Packet::Recv_uint16
uint16 Recv_uint16()
Read a 16 bits integer from the packet.
Definition: packet.cpp:231
DAYS_TILL_ORIGINAL_BASE_YEAR
#define DAYS_TILL_ORIGINAL_BASE_YEAR
The offset in days from the '_date == 0' till 'ConvertYMDToDate(ORIGINAL_BASE_YEAR,...
Definition: date_type.h:80
NetworkGameInfo::spectators_max
byte spectators_max
Max spectators allowed on server.
Definition: game.h:51
MAX_YEAR
static const Year MAX_YEAR
MAX_YEAR, nicely rounded value of the number of years that can be encoded in a single 32 bits date,...
Definition: date_type.h:94
NetworkGameInfo::map_set
byte map_set
Graphical set.
Definition: game.h:52