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Location: cpp/openttd-patchpack/source/src/network/core/udp.cpp
r21657:3a07e4f14efa
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(svn r26792) -Fix: TC_NO_SHADE did not work for 32bpp text rendering.
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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 core/udp.cpp Basic functions to receive and send UDP packets.
*/
#ifdef ENABLE_NETWORK
#include "../../stdafx.h"
#include "../../date_func.h"
#include "../../debug.h"
#include "udp.h"
#include "../../safeguards.h"
/**
* Create an UDP socket but don't listen yet.
* @param bind the addresses to bind to.
*/
NetworkUDPSocketHandler::NetworkUDPSocketHandler(NetworkAddressList *bind)
{
if (bind != NULL) {
for (NetworkAddress *addr = bind->Begin(); addr != bind->End(); addr++) {
*this->bind.Append() = *addr;
}
} else {
/* As hostname NULL and port 0/NULL don't go well when
* resolving it we need to add an address for each of
* the address families we support. */
*this->bind.Append() = NetworkAddress(NULL, 0, AF_INET);
*this->bind.Append() = NetworkAddress(NULL, 0, AF_INET6);
}
}
/**
* Start listening on the given host and port.
* @return true if at least one port is listening
*/
bool NetworkUDPSocketHandler::Listen()
{
/* Make sure socket is closed */
this->Close();
for (NetworkAddress *addr = this->bind.Begin(); addr != this->bind.End(); addr++) {
addr->Listen(SOCK_DGRAM, &this->sockets);
}
return this->sockets.Length() != 0;
}
/**
* Close the given UDP socket
*/
void NetworkUDPSocketHandler::Close()
{
for (SocketList::iterator s = this->sockets.Begin(); s != this->sockets.End(); s++) {
closesocket(s->second);
}
this->sockets.Clear();
}
NetworkRecvStatus NetworkUDPSocketHandler::CloseConnection(bool error)
{
NetworkSocketHandler::CloseConnection(error);
return NETWORK_RECV_STATUS_OKAY;
}
/**
* Send a packet over UDP
* @param p the packet to send
* @param recv the receiver (target) of the packet
* @param all send the packet using all sockets that can send it
* @param broadcast whether to send a broadcast message
*/
void NetworkUDPSocketHandler::SendPacket(Packet *p, NetworkAddress *recv, bool all, bool broadcast)
{
if (this->sockets.Length() == 0) this->Listen();
for (SocketList::iterator s = this->sockets.Begin(); s != this->sockets.End(); s++) {
/* Make a local copy because if we resolve it we cannot
* easily unresolve it so we can resolve it later again. */
NetworkAddress send(*recv);
/* Not the same type */
if (!send.IsFamily(s->first.GetAddress()->ss_family)) continue;
p->PrepareToSend();
#ifndef BEOS_NET_SERVER /* will work around this, some day; maybe. */
if (broadcast) {
/* Enable broadcast */
unsigned long val = 1;
if (setsockopt(s->second, SOL_SOCKET, SO_BROADCAST, (char *) &val, sizeof(val)) < 0) {
DEBUG(net, 1, "[udp] setting broadcast failed with: %i", GET_LAST_ERROR());
}
}
#endif
/* Send the buffer */
int res = sendto(s->second, (const char*)p->buffer, p->size, 0, (const struct sockaddr *)send.GetAddress(), send.GetAddressLength());
DEBUG(net, 7, "[udp] sendto(%s)", send.GetAddressAsString());
/* Check for any errors, but ignore it otherwise */
if (res == -1) DEBUG(net, 1, "[udp] sendto(%s) failed with: %i", send.GetAddressAsString(), GET_LAST_ERROR());
if (!all) break;
}
}
/**
* Receive a packet at UDP level
*/
void NetworkUDPSocketHandler::ReceivePackets()
{
for (SocketList::iterator s = this->sockets.Begin(); s != this->sockets.End(); s++) {
for (int i = 0; i < 1000; i++) { // Do not infinitely loop when DoSing with UDP
struct sockaddr_storage client_addr;
memset(&client_addr, 0, sizeof(client_addr));
Packet p(this);
socklen_t client_len = sizeof(client_addr);
/* Try to receive anything */
SetNonBlocking(s->second); // Some OSes seem to lose the non-blocking status of the socket
int nbytes = recvfrom(s->second, (char*)p.buffer, SEND_MTU, 0, (struct sockaddr *)&client_addr, &client_len);
/* Did we get the bytes for the base header of the packet? */
if (nbytes <= 0) break; // No data, i.e. no packet
if (nbytes <= 2) continue; // Invalid data; try next packet
NetworkAddress address(client_addr, client_len);
p.PrepareToRead();
/* If the size does not match the packet must be corrupted.
* Otherwise it will be marked as corrupted later on. */
if (nbytes != p.size) {
DEBUG(net, 1, "received a packet with mismatching size from %s", address.GetAddressAsString());
continue;
}
/* Handle the packet */
this->HandleUDPPacket(&p, &address);
}
}
}
/**
* Serializes the NetworkGameInfo struct to the packet
* @param p the packet to write the data to
* @param info the NetworkGameInfo struct to serialize
*/
void NetworkUDPSocketHandler::SendNetworkGameInfo(Packet *p, const NetworkGameInfo *info)
{
p->Send_uint8 (NETWORK_GAME_INFO_VERSION);
/*
* Please observe the order.
* The parts must be read in the same order as they are sent!
*/
/* Update the documentation in udp.h on changes
* to the NetworkGameInfo wire-protocol! */
/* NETWORK_GAME_INFO_VERSION = 4 */
{
/* Only send the GRF Identification (GRF_ID and MD5 checksum) of
* the GRFs that are needed, i.e. the ones that the server has
* selected in the NewGRF GUI and not the ones that are used due
* to the fact that they are in [newgrf-static] in openttd.cfg */
const GRFConfig *c;
uint count = 0;
/* Count number of GRFs to send information about */
for (c = info->grfconfig; c != NULL; c = c->next) {
if (!HasBit(c->flags, GCF_STATIC)) count++;
}
p->Send_uint8 (count); // Send number of GRFs
/* Send actual GRF Identifications */
for (c = info->grfconfig; c != NULL; c = c->next) {
if (!HasBit(c->flags, GCF_STATIC)) this->SendGRFIdentifier(p, &c->ident);
}
}
/* NETWORK_GAME_INFO_VERSION = 3 */
p->Send_uint32(info->game_date);
p->Send_uint32(info->start_date);
/* NETWORK_GAME_INFO_VERSION = 2 */
p->Send_uint8 (info->companies_max);
p->Send_uint8 (info->companies_on);
p->Send_uint8 (info->spectators_max);
/* NETWORK_GAME_INFO_VERSION = 1 */
p->Send_string(info->server_name);
p->Send_string(info->server_revision);
p->Send_uint8 (info->server_lang);
p->Send_bool (info->use_password);
p->Send_uint8 (info->clients_max);
p->Send_uint8 (info->clients_on);
p->Send_uint8 (info->spectators_on);
p->Send_string(info->map_name);
p->Send_uint16(info->map_width);
p->Send_uint16(info->map_height);
p->Send_uint8 (info->map_set);
p->Send_bool (info->dedicated);
}
/**
* Deserializes the NetworkGameInfo struct from the packet
* @param p the packet to read the data from
* @param info the NetworkGameInfo to deserialize into
*/
void NetworkUDPSocketHandler::ReceiveNetworkGameInfo(Packet *p, NetworkGameInfo *info)
{
static const Date MAX_DATE = ConvertYMDToDate(MAX_YEAR, 11, 31); // December is month 11
info->game_info_version = p->Recv_uint8();
/*
* Please observe the order.
* The parts must be read in the same order as they are sent!
*/
/* Update the documentation in udp.h on changes
* to the NetworkGameInfo wire-protocol! */
switch (info->game_info_version) {
case 4: {
GRFConfig **dst = &info->grfconfig;
uint i;
uint num_grfs = p->Recv_uint8();
/* Broken/bad data. It cannot have that many NewGRFs. */
if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
for (i = 0; i < num_grfs; i++) {
GRFConfig *c = new GRFConfig();
this->ReceiveGRFIdentifier(p, &c->ident);
this->HandleIncomingNetworkGameInfoGRFConfig(c);
/* Append GRFConfig to the list */
*dst = c;
dst = &c->next;
}
/* FALL THROUGH */
}
case 3:
info->game_date = Clamp(p->Recv_uint32(), 0, MAX_DATE);
info->start_date = Clamp(p->Recv_uint32(), 0, MAX_DATE);
/* FALL THROUGH */
case 2:
info->companies_max = p->Recv_uint8 ();
info->companies_on = p->Recv_uint8 ();
info->spectators_max = p->Recv_uint8 ();
/* FALL THROUGH */
case 1:
p->Recv_string(info->server_name, sizeof(info->server_name));
p->Recv_string(info->server_revision, sizeof(info->server_revision));
info->server_lang = p->Recv_uint8 ();
info->use_password = p->Recv_bool ();
info->clients_max = p->Recv_uint8 ();
info->clients_on = p->Recv_uint8 ();
info->spectators_on = p->Recv_uint8 ();
if (info->game_info_version < 3) { // 16 bits dates got scrapped and are read earlier
info->game_date = p->Recv_uint16() + DAYS_TILL_ORIGINAL_BASE_YEAR;
info->start_date = p->Recv_uint16() + DAYS_TILL_ORIGINAL_BASE_YEAR;
}
p->Recv_string(info->map_name, sizeof(info->map_name));
info->map_width = p->Recv_uint16();
info->map_height = p->Recv_uint16();
info->map_set = p->Recv_uint8 ();
info->dedicated = p->Recv_bool ();
if (info->server_lang >= NETWORK_NUM_LANGUAGES) info->server_lang = 0;
if (info->map_set >= NETWORK_NUM_LANDSCAPES) info->map_set = 0;
}
}
/**
* Handle an incoming packets by sending it to the correct function.
* @param p the received packet
* @param client_addr the sender of the packet
*/
void NetworkUDPSocketHandler::HandleUDPPacket(Packet *p, NetworkAddress *client_addr)
{
PacketUDPType type;
/* New packet == new client, which has not quit yet */
this->Reopen();
type = (PacketUDPType)p->Recv_uint8();
switch (this->HasClientQuit() ? PACKET_UDP_END : type) {
case PACKET_UDP_CLIENT_FIND_SERVER: this->Receive_CLIENT_FIND_SERVER(p, client_addr); break;
case PACKET_UDP_SERVER_RESPONSE: this->Receive_SERVER_RESPONSE(p, client_addr); break;
case PACKET_UDP_CLIENT_DETAIL_INFO: this->Receive_CLIENT_DETAIL_INFO(p, client_addr); break;
case PACKET_UDP_SERVER_DETAIL_INFO: this->Receive_SERVER_DETAIL_INFO(p, client_addr); break;
case PACKET_UDP_SERVER_REGISTER: this->Receive_SERVER_REGISTER(p, client_addr); break;
case PACKET_UDP_MASTER_ACK_REGISTER: this->Receive_MASTER_ACK_REGISTER(p, client_addr); break;
case PACKET_UDP_CLIENT_GET_LIST: this->Receive_CLIENT_GET_LIST(p, client_addr); break;
case PACKET_UDP_MASTER_RESPONSE_LIST: this->Receive_MASTER_RESPONSE_LIST(p, client_addr); break;
case PACKET_UDP_SERVER_UNREGISTER: this->Receive_SERVER_UNREGISTER(p, client_addr); break;
case PACKET_UDP_CLIENT_GET_NEWGRFS: this->Receive_CLIENT_GET_NEWGRFS(p, client_addr); break;
case PACKET_UDP_SERVER_NEWGRFS: this->Receive_SERVER_NEWGRFS(p, client_addr); break;
case PACKET_UDP_MASTER_SESSION_KEY: this->Receive_MASTER_SESSION_KEY(p, client_addr); break;
default:
if (this->HasClientQuit()) {
DEBUG(net, 0, "[udp] received invalid packet type %d from %s", type, client_addr->GetAddressAsString());
} else {
DEBUG(net, 0, "[udp] received illegal packet from %s", client_addr->GetAddressAsString());
}
break;
}
}
/**
* Helper for logging receiving invalid packets.
* @param type The received packet type.
* @param client_addr The address we received the packet from.
*/
void NetworkUDPSocketHandler::ReceiveInvalidPacket(PacketUDPType type, NetworkAddress *client_addr)
{
DEBUG(net, 0, "[udp] received packet type %d on wrong port from %s", type, client_addr->GetAddressAsString());
}
void NetworkUDPSocketHandler::Receive_CLIENT_FIND_SERVER(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_CLIENT_FIND_SERVER, client_addr); }
void NetworkUDPSocketHandler::Receive_SERVER_RESPONSE(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_SERVER_RESPONSE, client_addr); }
void NetworkUDPSocketHandler::Receive_CLIENT_DETAIL_INFO(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_CLIENT_DETAIL_INFO, client_addr); }
void NetworkUDPSocketHandler::Receive_SERVER_DETAIL_INFO(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_SERVER_DETAIL_INFO, client_addr); }
void NetworkUDPSocketHandler::Receive_SERVER_REGISTER(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_SERVER_REGISTER, client_addr); }
void NetworkUDPSocketHandler::Receive_MASTER_ACK_REGISTER(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_MASTER_ACK_REGISTER, client_addr); }
void NetworkUDPSocketHandler::Receive_CLIENT_GET_LIST(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_CLIENT_GET_LIST, client_addr); }
void NetworkUDPSocketHandler::Receive_MASTER_RESPONSE_LIST(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_MASTER_RESPONSE_LIST, client_addr); }
void NetworkUDPSocketHandler::Receive_SERVER_UNREGISTER(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_SERVER_UNREGISTER, client_addr); }
void NetworkUDPSocketHandler::Receive_CLIENT_GET_NEWGRFS(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_CLIENT_GET_NEWGRFS, client_addr); }
void NetworkUDPSocketHandler::Receive_SERVER_NEWGRFS(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_SERVER_NEWGRFS, client_addr); }
void NetworkUDPSocketHandler::Receive_MASTER_SESSION_KEY(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_MASTER_SESSION_KEY, client_addr); }
#endif /* ENABLE_NETWORK */
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