udp.cpp

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00014 #ifdef ENABLE_NETWORK
00015 
00016 #include "../../stdafx.h"
00017 #include "../../date_func.h"
00018 #include "../../debug.h"
00019 #include "udp.h"
00020 
00025 NetworkUDPSocketHandler::NetworkUDPSocketHandler(NetworkAddressList *bind)
00026 {
00027   if (bind != NULL) {
00028     for (NetworkAddress *addr = bind->Begin(); addr != bind->End(); addr++) {
00029       *this->bind.Append() = *addr;
00030     }
00031   } else {
00032     /* As hostname NULL and port 0/NULL don't go well when
00033      * resolving it we need to add an address for each of
00034      * the address families we support. */
00035     *this->bind.Append() = NetworkAddress(NULL, 0, AF_INET);
00036     *this->bind.Append() = NetworkAddress(NULL, 0, AF_INET6);
00037   }
00038 }
00039 
00040 
00045 bool NetworkUDPSocketHandler::Listen()
00046 {
00047   /* Make sure socket is closed */
00048   this->Close();
00049 
00050   for (NetworkAddress *addr = this->bind.Begin(); addr != this->bind.End(); addr++) {
00051     addr->Listen(SOCK_DGRAM, &this->sockets);
00052   }
00053 
00054   return this->sockets.Length() != 0;
00055 }
00056 
00060 void NetworkUDPSocketHandler::Close()
00061 {
00062   for (SocketList::iterator s = this->sockets.Begin(); s != this->sockets.End(); s++) {
00063     closesocket(s->second);
00064   }
00065   this->sockets.Clear();
00066 }
00067 
00068 NetworkRecvStatus NetworkUDPSocketHandler::CloseConnection(bool error)
00069 {
00070   NetworkSocketHandler::CloseConnection(error);
00071   return NETWORK_RECV_STATUS_OKAY;
00072 }
00073 
00081 void NetworkUDPSocketHandler::SendPacket(Packet *p, NetworkAddress *recv, bool all, bool broadcast)
00082 {
00083   if (this->sockets.Length() == 0) this->Listen();
00084 
00085   for (SocketList::iterator s = this->sockets.Begin(); s != this->sockets.End(); s++) {
00086     /* Make a local copy because if we resolve it we cannot
00087      * easily unresolve it so we can resolve it later again. */
00088     NetworkAddress send(*recv);
00089 
00090     /* Not the same type */
00091     if (!send.IsFamily(s->first.GetAddress()->ss_family)) continue;
00092 
00093     p->PrepareToSend();
00094 
00095 #ifndef BEOS_NET_SERVER /* will work around this, some day; maybe. */
00096     if (broadcast) {
00097       /* Enable broadcast */
00098       unsigned long val = 1;
00099       setsockopt(s->second, SOL_SOCKET, SO_BROADCAST, (char *) &val, sizeof(val));
00100     }
00101 #endif
00102 
00103     /* Send the buffer */
00104     int res = sendto(s->second, (const char*)p->buffer, p->size, 0, (struct sockaddr *)send.GetAddress(), send.GetAddressLength());
00105     DEBUG(net, 7, "[udp] sendto(%s)", send.GetAddressAsString());
00106 
00107     /* Check for any errors, but ignore it otherwise */
00108     if (res == -1) DEBUG(net, 1, "[udp] sendto(%s) failed with: %i", send.GetAddressAsString(), GET_LAST_ERROR());
00109 
00110     if (!all) break;
00111   }
00112 }
00113 
00117 void NetworkUDPSocketHandler::ReceivePackets()
00118 {
00119   for (SocketList::iterator s = this->sockets.Begin(); s != this->sockets.End(); s++) {
00120     struct sockaddr_storage client_addr;
00121     memset(&client_addr, 0, sizeof(client_addr));
00122 
00123     Packet p(this);
00124     socklen_t client_len = sizeof(client_addr);
00125 
00126     /* Try to receive anything */
00127     SetNonBlocking(s->second); // Some OSes seem to lose the non-blocking status of the socket
00128     int nbytes = recvfrom(s->second, (char*)p.buffer, SEND_MTU, 0, (struct sockaddr *)&client_addr, &client_len);
00129 
00130     /* We got some bytes for the base header of the packet. */
00131     if (nbytes > 2) {
00132       NetworkAddress address(client_addr, client_len);
00133       p.PrepareToRead();
00134 
00135       /* If the size does not match the packet must be corrupted.
00136        * Otherwise it will be marked as corrupted later on. */
00137       if (nbytes != p.size) {
00138         DEBUG(net, 1, "received a packet with mismatching size from %s", address.GetAddressAsString());
00139         return;
00140       }
00141 
00142       /* Handle the packet */
00143       this->HandleUDPPacket(&p, &address);
00144     }
00145   }
00146 }
00147 
00148 
00154 void NetworkUDPSocketHandler::SendNetworkGameInfo(Packet *p, const NetworkGameInfo *info)
00155 {
00156   p->Send_uint8 (NETWORK_GAME_INFO_VERSION);
00157 
00158   /*
00159    *              Please observe the order.
00160    * The parts must be read in the same order as they are sent!
00161    */
00162 
00163   /* Update the documentation in udp.h on changes
00164    * to the NetworkGameInfo wire-protocol! */
00165 
00166   /* NETWORK_GAME_INFO_VERSION = 4 */
00167   {
00168     /* Only send the GRF Identification (GRF_ID and MD5 checksum) of
00169      * the GRFs that are needed, i.e. the ones that the server has
00170      * selected in the NewGRF GUI and not the ones that are used due
00171      * to the fact that they are in [newgrf-static] in openttd.cfg */
00172     const GRFConfig *c;
00173     uint count = 0;
00174 
00175     /* Count number of GRFs to send information about */
00176     for (c = info->grfconfig; c != NULL; c = c->next) {
00177       if (!HasBit(c->flags, GCF_STATIC)) count++;
00178     }
00179     p->Send_uint8 (count); // Send number of GRFs
00180 
00181     /* Send actual GRF Identifications */
00182     for (c = info->grfconfig; c != NULL; c = c->next) {
00183       if (!HasBit(c->flags, GCF_STATIC)) this->SendGRFIdentifier(p, &c->ident);
00184     }
00185   }
00186 
00187   /* NETWORK_GAME_INFO_VERSION = 3 */
00188   p->Send_uint32(info->game_date);
00189   p->Send_uint32(info->start_date);
00190 
00191   /* NETWORK_GAME_INFO_VERSION = 2 */
00192   p->Send_uint8 (info->companies_max);
00193   p->Send_uint8 (info->companies_on);
00194   p->Send_uint8 (info->spectators_max);
00195 
00196   /* NETWORK_GAME_INFO_VERSION = 1 */
00197   p->Send_string(info->server_name);
00198   p->Send_string(info->server_revision);
00199   p->Send_uint8 (info->server_lang);
00200   p->Send_bool  (info->use_password);
00201   p->Send_uint8 (info->clients_max);
00202   p->Send_uint8 (info->clients_on);
00203   p->Send_uint8 (info->spectators_on);
00204   p->Send_string(info->map_name);
00205   p->Send_uint16(info->map_width);
00206   p->Send_uint16(info->map_height);
00207   p->Send_uint8 (info->map_set);
00208   p->Send_bool  (info->dedicated);
00209 }
00210 
00216 void NetworkUDPSocketHandler::ReceiveNetworkGameInfo(Packet *p, NetworkGameInfo *info)
00217 {
00218   static const Date MAX_DATE = ConvertYMDToDate(MAX_YEAR, 11, 31); // December is month 11
00219 
00220   info->game_info_version = p->Recv_uint8();
00221 
00222   /*
00223    *              Please observe the order.
00224    * The parts must be read in the same order as they are sent!
00225    */
00226 
00227   /* Update the documentation in udp.h on changes
00228    * to the NetworkGameInfo wire-protocol! */
00229 
00230   switch (info->game_info_version) {
00231     case 4: {
00232       GRFConfig **dst = &info->grfconfig;
00233       uint i;
00234       uint num_grfs = p->Recv_uint8();
00235 
00236       /* Broken/bad data. It cannot have that many NewGRFs. */
00237       if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
00238 
00239       for (i = 0; i < num_grfs; i++) {
00240         GRFConfig *c = new GRFConfig();
00241         this->ReceiveGRFIdentifier(p, &c->ident);
00242         this->HandleIncomingNetworkGameInfoGRFConfig(c);
00243 
00244         /* Append GRFConfig to the list */
00245         *dst = c;
00246         dst = &c->next;
00247       }
00248       /* FALL THROUGH */
00249     }
00250     case 3:
00251       info->game_date      = Clamp(p->Recv_uint32(), 0, MAX_DATE);
00252       info->start_date     = Clamp(p->Recv_uint32(), 0, MAX_DATE);
00253       /* FALL THROUGH */
00254     case 2:
00255       info->companies_max  = p->Recv_uint8 ();
00256       info->companies_on   = p->Recv_uint8 ();
00257       info->spectators_max = p->Recv_uint8 ();
00258       /* FALL THROUGH */
00259     case 1:
00260       p->Recv_string(info->server_name,     sizeof(info->server_name));
00261       p->Recv_string(info->server_revision, sizeof(info->server_revision));
00262       info->server_lang    = p->Recv_uint8 ();
00263       info->use_password   = p->Recv_bool  ();
00264       info->clients_max    = p->Recv_uint8 ();
00265       info->clients_on     = p->Recv_uint8 ();
00266       info->spectators_on  = p->Recv_uint8 ();
00267       if (info->game_info_version < 3) { // 16 bits dates got scrapped and are read earlier
00268         info->game_date    = p->Recv_uint16() + DAYS_TILL_ORIGINAL_BASE_YEAR;
00269         info->start_date   = p->Recv_uint16() + DAYS_TILL_ORIGINAL_BASE_YEAR;
00270       }
00271       p->Recv_string(info->map_name, sizeof(info->map_name));
00272       info->map_width      = p->Recv_uint16();
00273       info->map_height     = p->Recv_uint16();
00274       info->map_set        = p->Recv_uint8 ();
00275       info->dedicated      = p->Recv_bool  ();
00276 
00277       if (info->server_lang >= NETWORK_NUM_LANGUAGES)  info->server_lang = 0;
00278       if (info->map_set     >= NETWORK_NUM_LANDSCAPES) info->map_set     = 0;
00279   }
00280 }
00281 
00286 #define UDP_COMMAND(type) case type: this->NetworkPacketReceive_ ## type ## _command(p, client_addr); break;
00287 
00293 void NetworkUDPSocketHandler::HandleUDPPacket(Packet *p, NetworkAddress *client_addr)
00294 {
00295   PacketUDPType type;
00296 
00297   /* New packet == new client, which has not quit yet */
00298   this->Reopen();
00299 
00300   type = (PacketUDPType)p->Recv_uint8();
00301 
00302   switch (this->HasClientQuit() ? PACKET_UDP_END : type) {
00303     UDP_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER);
00304     UDP_COMMAND(PACKET_UDP_SERVER_RESPONSE);
00305     UDP_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO);
00306     UDP_COMMAND(PACKET_UDP_SERVER_DETAIL_INFO);
00307     UDP_COMMAND(PACKET_UDP_SERVER_REGISTER);
00308     UDP_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER);
00309     UDP_COMMAND(PACKET_UDP_CLIENT_GET_LIST);
00310     UDP_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST);
00311     UDP_COMMAND(PACKET_UDP_SERVER_UNREGISTER);
00312     UDP_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS);
00313     UDP_COMMAND(PACKET_UDP_SERVER_NEWGRFS);
00314     UDP_COMMAND(PACKET_UDP_MASTER_SESSION_KEY);
00315 
00316     default:
00317       if (this->HasClientQuit()) {
00318         DEBUG(net, 0, "[udp] received invalid packet type %d from %s", type, client_addr->GetAddressAsString());
00319       } else {
00320         DEBUG(net, 0, "[udp] received illegal packet from %s", client_addr->GetAddressAsString());
00321       }
00322       break;
00323   }
00324 }
00325 
00332 #define DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(type) \
00333 void NetworkUDPSocketHandler::NetworkPacketReceive_## type ##_command(\
00334     Packet *p, NetworkAddress *client_addr) { \
00335   DEBUG(net, 0, "[udp] received packet type %d on wrong port from %s", \
00336       type, client_addr->GetAddressAsString()); \
00337 }
00338 
00339 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER)
00340 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE)
00341 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO)
00342 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_DETAIL_INFO)
00343 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_REGISTER)
00344 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER)
00345 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_LIST)
00346 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST)
00347 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_UNREGISTER)
00348 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS)
00349 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS)
00350 DEFINE_UNAVAILABLE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_SESSION_KEY)
00351 
00352 #endif /* ENABLE_NETWORK */

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