# network_udp.cpp

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    00001 /* $Id: network_udp.cpp 18028 2009-11-09 10:40:33Z rubidium $ */
    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
    00017 #ifdef ENABLE_NETWORK
    00018
    00019 #include "../stdafx.h"
    00020 #include "../date_func.h"
    00021 #include "../map_func.h"
    00022 #include "network_gamelist.h"
    00023 #include "network_internal.h"
    00024 #include "network_udp.h"
    00025 #include "../core/endian_func.hpp"
    00026 #include "../company_base.h"
    00027 #include "../thread/thread.h"
    00028 #include "../rev.h"
    00029
    00030 #include "core/udp.h"
    00031
    00032 static ThreadMutex *_network_udp_mutex = ThreadMutex::New();
    00033
    00035 static uint64 _session_key = 0;
    00036
    00037 enum {
    00038   ADVERTISE_NORMAL_INTERVAL = 30000, // interval between advertising in ticks (15 minutes)
    00039   ADVERTISE_RETRY_INTERVAL  =   300, // readvertise when no response after this many ticks (9 seconds)
    00040   ADVERTISE_RETRY_TIMES     =     3  // give up readvertising after this much failed retries
    00041 };
    00042
    00043 NetworkUDPSocketHandler *_udp_client_socket = NULL;
    00044 NetworkUDPSocketHandler *_udp_server_socket = NULL;
    00045 NetworkUDPSocketHandler *_udp_master_socket = NULL;
    00046
    00048
    00049 class MasterNetworkUDPSocketHandler : public NetworkUDPSocketHandler {
    00050 protected:
    00051   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER);
    00052   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_SESSION_KEY);
    00053 public:
    00054   MasterNetworkUDPSocketHandler(NetworkAddressList *addresses) : NetworkUDPSocketHandler(addresses) {}
    00055   virtual ~MasterNetworkUDPSocketHandler() {}
    00056 };
    00057
    00058 DEF_UDP_RECEIVE_COMMAND(Master, PACKET_UDP_MASTER_ACK_REGISTER)
    00059 {
    00060   _network_advertise_retries = 0;
    00061   DEBUG(net, 2, "[udp] advertising on master server successful (%s)", NetworkAddress::AddressFamilyAsString(client_addr->GetAddress()->ss_family));
    00062
    00063   /* We are advertised, but we don't want to! */
    00064   if (!_settings_client.network.server_advertise) NetworkUDPRemoveAdvertise(false);
    00065 }
    00066
    00067 DEF_UDP_RECEIVE_COMMAND(Master, PACKET_UDP_MASTER_SESSION_KEY)
    00068 {
    00069   _session_key = p->Recv_uint64();
    00070   DEBUG(net, 2, "[udp] received new session key from master server (%s)", NetworkAddress::AddressFamilyAsString(client_addr->GetAddress()->ss_family));
    00071 }
    00072
    00074
    00075 class ServerNetworkUDPSocketHandler : public NetworkUDPSocketHandler {
    00076 protected:
    00077   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER);
    00078   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO);
    00079   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS);
    00080 public:
    00081   ServerNetworkUDPSocketHandler(NetworkAddressList *addresses) : NetworkUDPSocketHandler(addresses) {}
    00082   virtual ~ServerNetworkUDPSocketHandler() {}
    00083 };
    00084
    00085 DEF_UDP_RECEIVE_COMMAND(Server, PACKET_UDP_CLIENT_FIND_SERVER)
    00086 {
    00087   /* Just a fail-safe.. should never happen */
    00088   if (!_network_udp_server) {
    00089     return;
    00090   }
    00091
    00092   NetworkGameInfo ngi;
    00093
    00094   /* Update some game_info */
    00095   ngi.clients_on     = _network_game_info.clients_on;
    00096   ngi.start_date     = ConvertYMDToDate(_settings_game.game_creation.starting_year, 0, 1);
    00097
    00098   ngi.server_lang    = _settings_client.network.server_lang;
    00099   ngi.use_password   = !StrEmpty(_settings_client.network.server_password);
    00100   ngi.clients_max    = _settings_client.network.max_clients;
    00101   ngi.companies_on   = (byte)Company::GetNumItems();
    00102   ngi.companies_max  = _settings_client.network.max_companies;
    00103   ngi.spectators_on  = NetworkSpectatorCount();
    00104   ngi.spectators_max = _settings_client.network.max_spectators;
    00105   ngi.game_date      = _date;
    00106   ngi.map_width      = MapSizeX();
    00107   ngi.map_height     = MapSizeY();
    00108   ngi.map_set        = _settings_game.game_creation.landscape;
    00109   ngi.dedicated      = _network_dedicated;
    00110   ngi.grfconfig      = _grfconfig;
    00111
    00112   strecpy(ngi.map_name, _network_game_info.map_name, lastof(ngi.map_name));
    00113   strecpy(ngi.server_name, _settings_client.network.server_name, lastof(ngi.server_name));
    00114   strecpy(ngi.server_revision, _openttd_revision, lastof(ngi.server_revision));
    00115
    00116   Packet packet(PACKET_UDP_SERVER_RESPONSE);
    00117   this->Send_NetworkGameInfo(&packet, &ngi);
    00118
    00119   /* Let the client know that we are here */
    00120   this->SendPacket(&packet, client_addr);
    00121
    00122   DEBUG(net, 2, "[udp] queried from %s", client_addr->GetHostname());
    00123 }
    00124
    00125 DEF_UDP_RECEIVE_COMMAND(Server, PACKET_UDP_CLIENT_DETAIL_INFO)
    00126 {
    00127   /* Just a fail-safe.. should never happen */
    00128   if (!_network_udp_server) return;
    00129
    00130   Packet packet(PACKET_UDP_SERVER_DETAIL_INFO);
    00131
    00132   /* Send the amount of active companies */
    00133   packet.Send_uint8 (NETWORK_COMPANY_INFO_VERSION);
    00134   packet.Send_uint8 ((uint8)Company::GetNumItems());
    00135
    00136   /* Fetch the latest version of the stats */
    00137   NetworkCompanyStats company_stats[MAX_COMPANIES];
    00138   NetworkPopulateCompanyStats(company_stats);
    00139
    00140   Company *company;
    00141   /* Go through all the companies */
    00142   FOR_ALL_COMPANIES(company) {
    00143     /* Send the information */
    00144     this->Send_CompanyInformation(&packet, company, &company_stats[company->index]);
    00145   }
    00146
    00147   this->SendPacket(&packet, client_addr);
    00148 }
    00149
    00163 DEF_UDP_RECEIVE_COMMAND(Server, PACKET_UDP_CLIENT_GET_NEWGRFS)
    00164 {
    00165   uint8 num_grfs;
    00166   uint i;
    00167
    00168   const GRFConfig *in_reply[NETWORK_MAX_GRF_COUNT];
    00169   uint8 in_reply_count = 0;
    00170   size_t packet_len = 0;
    00171
    00172   DEBUG(net, 6, "[udp] newgrf data request from %s", client_addr->GetAddressAsString());
    00173
    00174   num_grfs = p->Recv_uint8 ();
    00175   if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
    00176
    00177   for (i = 0; i < num_grfs; i++) {
    00178     GRFConfig c;
    00179     const GRFConfig *f;
    00180
    00181     this->Recv_GRFIdentifier(p, &c);
    00182
    00183     /* Find the matching GRF file */
    00184     f = FindGRFConfig(c.grfid, c.md5sum);
    00185     if (f == NULL) continue; // The GRF is unknown to this server
    00186
    00187     /* If the reply might exceed the size of the packet, only reply
    00188      * the current list and do not send the other data.
    00189      * The name could be an empty string, if so take the filename. */
    00190     packet_len += sizeof(c.grfid) + sizeof(c.md5sum) +
    00191         min(strlen((f->name != NULL && !StrEmpty(f->name)) ? f->name : f->filename) + 1, (size_t)NETWORK_GRF_NAME_LENGTH);
    00192     if (packet_len > SEND_MTU - 4) { // 4 is 3 byte header + grf count in reply
    00193       break;
    00194     }
    00195     in_reply[in_reply_count] = f;
    00196     in_reply_count++;
    00197   }
    00198
    00199   if (in_reply_count == 0) return;
    00200
    00201   Packet packet(PACKET_UDP_SERVER_NEWGRFS);
    00202   packet.Send_uint8(in_reply_count);
    00203   for (i = 0; i < in_reply_count; i++) {
    00204     char name[NETWORK_GRF_NAME_LENGTH];
    00205
    00206     /* The name could be an empty string, if so take the filename */
    00207     strecpy(name, (in_reply[i]->name != NULL && !StrEmpty(in_reply[i]->name)) ?
    00208         in_reply[i]->name : in_reply[i]->filename, lastof(name));
    00209     this->Send_GRFIdentifier(&packet, in_reply[i]);
    00210     packet.Send_string(name);
    00211   }
    00212
    00213   this->SendPacket(&packet, client_addr);
    00214 }
    00215
    00217
    00218 class ClientNetworkUDPSocketHandler : public NetworkUDPSocketHandler {
    00219 protected:
    00220   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE);
    00221   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST);
    00222   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS);
    00223   virtual void HandleIncomingNetworkGameInfoGRFConfig(GRFConfig *config);
    00224 public:
    00225   virtual ~ClientNetworkUDPSocketHandler() {}
    00226 };
    00227
    00228 DEF_UDP_RECEIVE_COMMAND(Client, PACKET_UDP_SERVER_RESPONSE)
    00229 {
    00230   NetworkGameList *item;
    00231
    00232   /* Just a fail-safe.. should never happen */
    00233   if (_network_udp_server) return;
    00234
    00235   DEBUG(net, 4, "[udp] server response from %s", client_addr->GetAddressAsString());
    00236
    00237   /* Find next item */
    00238   item = NetworkGameListAddItem(*client_addr);
    00239
    00240   this->Recv_NetworkGameInfo(p, &item->info);
    00241
    00242   item->info.compatible = true;
    00243   {
    00244     /* Checks whether there needs to be a request for names of GRFs and makes
    00245      * the request if necessary. GRFs that need to be requested are the GRFs
    00246      * that do not exist on the clients system and we do not have the name
    00247      * resolved of, i.e. the name is still UNKNOWN_GRF_NAME_PLACEHOLDER.
    00248      * The in_request array and in_request_count are used so there is no need
    00249      * to do a second loop over the GRF list, which can be relatively expensive
    00250      * due to the string comparisons. */
    00251     const GRFConfig *in_request[NETWORK_MAX_GRF_COUNT];
    00252     const GRFConfig *c;
    00253     uint in_request_count = 0;
    00254
    00255     for (c = item->info.grfconfig; c != NULL; c = c->next) {
    00256       if (c->status == GCS_NOT_FOUND) item->info.compatible = false;
    00257       if (c->status != GCS_NOT_FOUND || strcmp(c->name, UNKNOWN_GRF_NAME_PLACEHOLDER) != 0) continue;
    00258       in_request[in_request_count] = c;
    00259       in_request_count++;
    00260     }
    00261
    00262     if (in_request_count > 0) {
    00263       /* There are 'unknown' GRFs, now send a request for them */
    00264       uint i;
    00265       Packet packet(PACKET_UDP_CLIENT_GET_NEWGRFS);
    00266
    00267       packet.Send_uint8(in_request_count);
    00268       for (i = 0; i < in_request_count; i++) {
    00269         this->Send_GRFIdentifier(&packet, in_request[i]);
    00270       }
    00271
    00272       this->SendPacket(&packet, &item->address);
    00273     }
    00274   }
    00275
    00276   if (item->info.hostname[0] == '\0') {
    00277     snprintf(item->info.hostname, sizeof(item->info.hostname), "%s", client_addr->GetHostname());
    00278   }
    00279
    00280   if (client_addr->GetAddress()->ss_family == AF_INET6) {
    00281     strecat(item->info.server_name, " (IPv6)", lastof(item->info.server_name));
    00282   }
    00283
    00284   /* Check if we are allowed on this server based on the revision-match */
    00285   item->info.version_compatible = IsNetworkCompatibleVersion(item->info.server_revision);
    00286   item->info.compatible &= item->info.version_compatible; // Already contains match for GRFs
    00287
    00288   item->online = true;
    00289
    00290   UpdateNetworkGameWindow(false);
    00291 }
    00292
    00293 DEF_UDP_RECEIVE_COMMAND(Client, PACKET_UDP_MASTER_RESPONSE_LIST)
    00294 {
    00295   /* packet begins with the protocol version (uint8)
    00296    * then an uint16 which indicates how many
    00297    * ip:port pairs are in this packet, after that
    00298    * an uint32 (ip) and an uint16 (port) for each pair.
    00299    */
    00300
    00301   ServerListType type = (ServerListType)(p->Recv_uint8() - 1);
    00302
    00303   if (type < SLT_END) {
    00304     for (int i = p->Recv_uint16(); i != 0 ; i--) {
    00305       sockaddr_storage addr_storage;
    00306       memset(&addr_storage, 0, sizeof(addr_storage));
    00307
    00308       if (type == SLT_IPv4) {
    00309         addr_storage.ss_family = AF_INET;
    00310         ((sockaddr_in*)&addr_storage)->sin_addr.s_addr = TO_LE32(p->Recv_uint32());
    00311       } else {
    00312         assert(type == SLT_IPv6);
    00313         addr_storage.ss_family = AF_INET6;
    00314         byte *addr = (byte*)&((sockaddr_in6*)&addr_storage)->sin6_addr;
    00315         for (uint i = 0; i < sizeof(in6_addr); i++) *addr++ = p->Recv_uint8();
    00316       }
    00317       NetworkAddress addr(addr_storage, type == SLT_IPv4 ? sizeof(sockaddr_in) : sizeof(sockaddr_in6));
    00318       addr.SetPort(p->Recv_uint16());
    00319
    00320       /* Somehow we reached the end of the packet */
    00321       if (this->HasClientQuit()) return;
    00322
    00323       NetworkUDPQueryServer(addr);
    00324     }
    00325   }
    00326 }
    00327
    00329 DEF_UDP_RECEIVE_COMMAND(Client, PACKET_UDP_SERVER_NEWGRFS)
    00330 {
    00331   uint8 num_grfs;
    00332   uint i;
    00333
    00334   DEBUG(net, 6, "[udp] newgrf data reply from %s", client_addr->GetAddressAsString());
    00335
    00336   num_grfs = p->Recv_uint8 ();
    00337   if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
    00338
    00339   for (i = 0; i < num_grfs; i++) {
    00340     char *unknown_name;
    00341     char name[NETWORK_GRF_NAME_LENGTH];
    00342     GRFConfig c;
    00343
    00344     this->Recv_GRFIdentifier(p, &c);
    00345     p->Recv_string(name, sizeof(name));
    00346
    00347     /* An empty name is not possible under normal circumstances
    00348      * and causes problems when showing the NewGRF list. */
    00349     if (StrEmpty(name)) continue;
    00350
    00351     /* Finds the fake GRFConfig for the just read GRF ID and MD5sum tuple.
    00352      * If it exists and not resolved yet, then name of the fake GRF is
    00353      * overwritten with the name from the reply. */
    00354     unknown_name = FindUnknownGRFName(c.grfid, c.md5sum, false);
    00355     if (unknown_name != NULL && strcmp(unknown_name, UNKNOWN_GRF_NAME_PLACEHOLDER) == 0) {
    00356       ttd_strlcpy(unknown_name, name, NETWORK_GRF_NAME_LENGTH);
    00357     }
    00358   }
    00359 }
    00360
    00361 void ClientNetworkUDPSocketHandler::HandleIncomingNetworkGameInfoGRFConfig(GRFConfig *config)
    00362 {
    00363   /* Find the matching GRF file */
    00364   const GRFConfig *f = FindGRFConfig(config->grfid, config->md5sum);
    00365   if (f == NULL) {
    00366     /* Don't know the GRF, so mark game incompatible and the (possibly)
    00367      * already resolved name for this GRF (another server has sent the
    00368      * name of the GRF already */
    00369     config->name   = FindUnknownGRFName(config->grfid, config->md5sum, true);
    00370     config->status = GCS_NOT_FOUND;
    00371   } else {
    00372     config->filename  = f->filename;
    00373     config->name      = f->name;
    00374     config->info      = f->info;
    00375   }
    00376   SetBit(config->flags, GCF_COPY);
    00377 }
    00378
    00379 /* Broadcast to all ips */
    00380 static void NetworkUDPBroadCast(NetworkUDPSocketHandler *socket)
    00381 {
    00382   for (NetworkAddress *addr = _broadcast_list.Begin(); addr != _broadcast_list.End(); addr++) {
    00383     Packet p(PACKET_UDP_CLIENT_FIND_SERVER);
    00384
    00385     DEBUG(net, 4, "[udp] broadcasting to %s", addr->GetHostname());
    00386
    00387     socket->SendPacket(&p, addr, true, true);
    00388   }
    00389 }
    00390
    00391
    00392 /* Request the the server-list from the master server */
    00393 void NetworkUDPQueryMasterServer()
    00394 {
    00395   Packet p(PACKET_UDP_CLIENT_GET_LIST);
    00396   NetworkAddress out_addr(NETWORK_MASTER_SERVER_HOST, NETWORK_MASTER_SERVER_PORT);
    00397
    00398   /* packet only contains protocol version */
    00399   p.Send_uint8(NETWORK_MASTER_SERVER_VERSION);
    00400   p.Send_uint8(SLT_AUTODETECT);
    00401
    00402   _udp_client_socket->SendPacket(&p, &out_addr, true);
    00403
    00404   DEBUG(net, 2, "[udp] master server queried at %s", out_addr.GetAddressAsString());
    00405 }
    00406
    00407 /* Find all servers */
    00408 void NetworkUDPSearchGame()
    00409 {
    00410   /* We are still searching.. */
    00411   if (_network_udp_broadcast > 0) return;
    00412
    00413   DEBUG(net, 0, "[udp] searching server");
    00414
    00415   NetworkUDPBroadCast(_udp_client_socket);
    00416   _network_udp_broadcast = 300; // Stay searching for 300 ticks
    00417 }
    00418
    00420 struct NetworkUDPQueryServerInfo : NetworkAddress {
    00421   bool manually;
    00422   NetworkUDPQueryServerInfo(const NetworkAddress &address, bool manually) :
    00423     NetworkAddress(address),
    00424     manually(manually)
    00425   {
    00426   }
    00427 };
    00428
    00433 static void NetworkUDPQueryServerThread(void *pntr)
    00434 {
    00435   NetworkUDPQueryServerInfo *info = (NetworkUDPQueryServerInfo*)pntr;
    00436
    00437   /* Clear item in gamelist */
    00438   NetworkGameList *item = CallocT<NetworkGameList>(1);
    00439   item->address = *info;
    00440   info->GetAddressAsString(item->info.server_name, lastof(item->info.server_name));
    00441   strecpy(item->info.hostname, info->GetHostname(), lastof(item->info.hostname));
    00442   item->manually = info->manually;
    00443   NetworkGameListAddItemDelayed(item);
    00444
    00445   _network_udp_mutex->BeginCritical();
    00446   /* Init the packet */
    00447   Packet p(PACKET_UDP_CLIENT_FIND_SERVER);
    00448   if (_udp_client_socket != NULL) _udp_client_socket->SendPacket(&p, info);
    00449   _network_udp_mutex->EndCritical();
    00450
    00451   delete info;
    00452 }
    00453
    00454 void NetworkUDPQueryServer(NetworkAddress address, bool manually)
    00455 {
    00456   NetworkUDPQueryServerInfo *info = new NetworkUDPQueryServerInfo(address, manually);
    00457   if (address.IsResolved() || !ThreadObject::New(NetworkUDPQueryServerThread, info)) {
    00458     NetworkUDPQueryServerThread(info);
    00459   }
    00460 }
    00461
    00462 static void NetworkUDPRemoveAdvertiseThread(void *pntr)
    00463 {
    00464   DEBUG(net, 1, "[udp] removing advertise from master server");
    00465
    00466   /* Find somewhere to send */
    00467   NetworkAddress out_addr(NETWORK_MASTER_SERVER_HOST, NETWORK_MASTER_SERVER_PORT);
    00468
    00469   /* Send the packet */
    00470   Packet p(PACKET_UDP_SERVER_UNREGISTER);
    00471   /* Packet is: Version, server_port */
    00472   p.Send_uint8 (NETWORK_MASTER_SERVER_VERSION);
    00473   p.Send_uint16(_settings_client.network.server_port);
    00474
    00475   _network_udp_mutex->BeginCritical();
    00476   if (_udp_master_socket != NULL) _udp_master_socket->SendPacket(&p, &out_addr, true);
    00477   _network_udp_mutex->EndCritical();
    00478 }
    00479
    00484 void NetworkUDPRemoveAdvertise(bool blocking)
    00485 {
    00486   /* Check if we are advertising */
    00487   if (!_networking || !_network_server || !_network_udp_server) return;
    00488
    00489   if (blocking || !ThreadObject::New(NetworkUDPRemoveAdvertiseThread, NULL)) {
    00490     NetworkUDPRemoveAdvertiseThread(NULL);
    00491   }
    00492 }
    00493
    00494 static void NetworkUDPAdvertiseThread(void *pntr)
    00495 {
    00496   /* Find somewhere to send */
    00497   NetworkAddress out_addr(NETWORK_MASTER_SERVER_HOST, NETWORK_MASTER_SERVER_PORT);
    00498
    00499   DEBUG(net, 1, "[udp] advertising to master server");
    00500
    00501   /* Add a bit more messaging when we cannot get a session key */
    00502   static byte session_key_retries = 0;
    00503   if (_session_key == 0 && session_key_retries++ == 2) {
    00504     DEBUG(net, 0, "[udp] advertising to the master server is failing");
    00505     DEBUG(net, 0, "[udp]   we are not receiving the session key from the server");
    00506     DEBUG(net, 0, "[udp]   please allow udp packets from %s to you to be delivered", out_addr.GetAddressAsString(false));
    00507     DEBUG(net, 0, "[udp]   please allow udp packets from you to %s to be delivered", out_addr.GetAddressAsString(false));
    00508   }
    00509   if (_session_key != 0 && _network_advertise_retries == 0) {
    00510     DEBUG(net, 0, "[udp] advertising to the master server is failing");
    00511     DEBUG(net, 0, "[udp]   we are not receiving the acknowledgement from the server");
    00512     DEBUG(net, 0, "[udp]   this usually means that the master server cannot reach us");
    00513     DEBUG(net, 0, "[udp]   please allow udp and tcp packets to port %u to be delivered", _settings_client.network.server_port);
    00514     DEBUG(net, 0, "[udp]   please allow udp and tcp packets from port %u to be delivered", _settings_client.network.server_port);
    00515   }
    00516
    00517   /* Send the packet */
    00518   Packet p(PACKET_UDP_SERVER_REGISTER);
    00519   /* Packet is: WELCOME_MESSAGE, Version, server_port */
    00520   p.Send_string(NETWORK_MASTER_SERVER_WELCOME_MESSAGE);
    00521   p.Send_uint8 (NETWORK_MASTER_SERVER_VERSION);
    00522   p.Send_uint16(_settings_client.network.server_port);
    00523   p.Send_uint64(_session_key);
    00524
    00525   _network_udp_mutex->BeginCritical();
    00526   if (_udp_master_socket != NULL) _udp_master_socket->SendPacket(&p, &out_addr, true);
    00527   _network_udp_mutex->EndCritical();
    00528 }
    00529
    00530 /* Register us to the master server
    00531  *   This function checks if it needs to send an advertise */
    00532 void NetworkUDPAdvertise()
    00533 {
    00534   /* Check if we should send an advertise */
    00535   if (!_networking || !_network_server || !_network_udp_server || !_settings_client.network.server_advertise)
    00536     return;
    00537
    00538   if (_network_need_advertise) {
    00539     _network_need_advertise = false;
    00540     _network_advertise_retries = ADVERTISE_RETRY_TIMES;
    00541   } else {
    00542     /* Only send once every ADVERTISE_NORMAL_INTERVAL ticks */
    00543     if (_network_advertise_retries == 0) {
    00544       if ((_network_last_advertise_frame + ADVERTISE_NORMAL_INTERVAL) > _frame_counter)
    00545         return;
    00546       _network_advertise_retries = ADVERTISE_RETRY_TIMES;
    00547     }
    00548
    00549     if ((_network_last_advertise_frame + ADVERTISE_RETRY_INTERVAL) > _frame_counter)
    00550       return;
    00551   }
    00552
    00553   _network_advertise_retries--;
    00554   _network_last_advertise_frame = _frame_counter;
    00555
    00556   if (!ThreadObject::New(NetworkUDPAdvertiseThread, NULL)) {
    00557     NetworkUDPAdvertiseThread(NULL);
    00558   }
    00559 }
    00560
    00561 void NetworkUDPInitialize()
    00562 {
    00563   /* If not closed, then do it. */
    00564   if (_udp_server_socket != NULL) NetworkUDPClose();
    00565
    00566   DEBUG(net, 1, "[udp] initializing listeners");
    00567   assert(_udp_client_socket == NULL && _udp_server_socket == NULL && _udp_master_socket == NULL);
    00568
    00569   _network_udp_mutex->BeginCritical();
    00570
    00571   _udp_client_socket = new ClientNetworkUDPSocketHandler();
    00572
    00573   NetworkAddressList server;
    00574   GetBindAddresses(&server, _settings_client.network.server_port);
    00575   _udp_server_socket = new ServerNetworkUDPSocketHandler(&server);
    00576
    00577   server.Clear();
    00578   GetBindAddresses(&server, 0);
    00579   _udp_master_socket = new MasterNetworkUDPSocketHandler(&server);
    00580
    00581   _network_udp_server = false;
    00582   _network_udp_broadcast = 0;
    00583   _network_udp_mutex->EndCritical();
    00584 }
    00585
    00586 void NetworkUDPClose()
    00587 {
    00588   _network_udp_mutex->BeginCritical();
    00589   _udp_server_socket->Close();
    00590   _udp_master_socket->Close();
    00591   _udp_client_socket->Close();
    00592   delete _udp_client_socket;
    00593   delete _udp_server_socket;
    00594   delete _udp_master_socket;
    00595   _udp_client_socket = NULL;
    00596   _udp_server_socket = NULL;
    00597   _udp_master_socket = NULL;
    00598   _network_udp_mutex->EndCritical();
    00599
    00600   _network_udp_server = false;
    00601   _network_udp_broadcast = 0;
    00602   DEBUG(net, 1, "[udp] closed listeners");
    00603 }
    00604
    00605 #endif /* ENABLE_NETWORK */