network_udp.cpp

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00001 /* $Id: network_udp.cpp 19094 2010-02-11 14:58:51Z yexo $ */
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 "../debug.h"
00023 #include "network_gamelist.h"
00024 #include "network_internal.h"
00025 #include "network_udp.h"
00026 #include "network.h"
00027 #include "../core/endian_func.hpp"
00028 #include "../company_base.h"
00029 #include "../thread/thread.h"
00030 #include "../rev.h"
00031 
00032 #include "core/udp.h"
00033 
00034 static ThreadMutex *_network_udp_mutex = ThreadMutex::New();
00035 
00037 static uint64 _session_key = 0;
00038 
00039 enum {
00040   ADVERTISE_NORMAL_INTERVAL = 30000, // interval between advertising in ticks (15 minutes)
00041   ADVERTISE_RETRY_INTERVAL  =   300, // readvertise when no response after this many ticks (9 seconds)
00042   ADVERTISE_RETRY_TIMES     =     3  // give up readvertising after this much failed retries
00043 };
00044 
00045 NetworkUDPSocketHandler *_udp_client_socket = NULL; 
00046 NetworkUDPSocketHandler *_udp_server_socket = NULL; 
00047 NetworkUDPSocketHandler *_udp_master_socket = NULL; 
00048 
00050 
00051 class MasterNetworkUDPSocketHandler : public NetworkUDPSocketHandler {
00052 protected:
00053   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_ACK_REGISTER);
00054   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_SESSION_KEY);
00055 public:
00056   MasterNetworkUDPSocketHandler(NetworkAddressList *addresses) : NetworkUDPSocketHandler(addresses) {}
00057   virtual ~MasterNetworkUDPSocketHandler() {}
00058 };
00059 
00060 DEF_UDP_RECEIVE_COMMAND(Master, PACKET_UDP_MASTER_ACK_REGISTER)
00061 {
00062   _network_advertise_retries = 0;
00063   DEBUG(net, 2, "[udp] advertising on master server successful (%s)", NetworkAddress::AddressFamilyAsString(client_addr->GetAddress()->ss_family));
00064 
00065   /* We are advertised, but we don't want to! */
00066   if (!_settings_client.network.server_advertise) NetworkUDPRemoveAdvertise(false);
00067 }
00068 
00069 DEF_UDP_RECEIVE_COMMAND(Master, PACKET_UDP_MASTER_SESSION_KEY)
00070 {
00071   _session_key = p->Recv_uint64();
00072   DEBUG(net, 2, "[udp] received new session key from master server (%s)", NetworkAddress::AddressFamilyAsString(client_addr->GetAddress()->ss_family));
00073 }
00074 
00076 
00077 class ServerNetworkUDPSocketHandler : public NetworkUDPSocketHandler {
00078 protected:
00079   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_FIND_SERVER);
00080   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_DETAIL_INFO);
00081   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_CLIENT_GET_NEWGRFS);
00082 public:
00083   ServerNetworkUDPSocketHandler(NetworkAddressList *addresses) : NetworkUDPSocketHandler(addresses) {}
00084   virtual ~ServerNetworkUDPSocketHandler() {}
00085 };
00086 
00087 DEF_UDP_RECEIVE_COMMAND(Server, PACKET_UDP_CLIENT_FIND_SERVER)
00088 {
00089   /* Just a fail-safe.. should never happen */
00090   if (!_network_udp_server) {
00091     return;
00092   }
00093 
00094   NetworkGameInfo ngi;
00095 
00096   /* Update some game_info */
00097   ngi.clients_on     = _network_game_info.clients_on;
00098   ngi.start_date     = ConvertYMDToDate(_settings_game.game_creation.starting_year, 0, 1);
00099 
00100   ngi.server_lang    = _settings_client.network.server_lang;
00101   ngi.use_password   = !StrEmpty(_settings_client.network.server_password);
00102   ngi.clients_max    = _settings_client.network.max_clients;
00103   ngi.companies_on   = (byte)Company::GetNumItems();
00104   ngi.companies_max  = _settings_client.network.max_companies;
00105   ngi.spectators_on  = NetworkSpectatorCount();
00106   ngi.spectators_max = _settings_client.network.max_spectators;
00107   ngi.game_date      = _date;
00108   ngi.map_width      = MapSizeX();
00109   ngi.map_height     = MapSizeY();
00110   ngi.map_set        = _settings_game.game_creation.landscape;
00111   ngi.dedicated      = _network_dedicated;
00112   ngi.grfconfig      = _grfconfig;
00113 
00114   strecpy(ngi.map_name, _network_game_info.map_name, lastof(ngi.map_name));
00115   strecpy(ngi.server_name, _settings_client.network.server_name, lastof(ngi.server_name));
00116   strecpy(ngi.server_revision, _openttd_revision, lastof(ngi.server_revision));
00117 
00118   Packet packet(PACKET_UDP_SERVER_RESPONSE);
00119   this->Send_NetworkGameInfo(&packet, &ngi);
00120 
00121   /* Let the client know that we are here */
00122   this->SendPacket(&packet, client_addr);
00123 
00124   DEBUG(net, 2, "[udp] queried from %s", client_addr->GetHostname());
00125 }
00126 
00127 DEF_UDP_RECEIVE_COMMAND(Server, PACKET_UDP_CLIENT_DETAIL_INFO)
00128 {
00129   /* Just a fail-safe.. should never happen */
00130   if (!_network_udp_server) return;
00131 
00132   Packet packet(PACKET_UDP_SERVER_DETAIL_INFO);
00133 
00134   /* Send the amount of active companies */
00135   packet.Send_uint8 (NETWORK_COMPANY_INFO_VERSION);
00136   packet.Send_uint8 ((uint8)Company::GetNumItems());
00137 
00138   /* Fetch the latest version of the stats */
00139   NetworkCompanyStats company_stats[MAX_COMPANIES];
00140   NetworkPopulateCompanyStats(company_stats);
00141 
00142   Company *company;
00143   /* Go through all the companies */
00144   FOR_ALL_COMPANIES(company) {
00145     /* Send the information */
00146     this->Send_CompanyInformation(&packet, company, &company_stats[company->index]);
00147   }
00148 
00149   this->SendPacket(&packet, client_addr);
00150 }
00151 
00165 DEF_UDP_RECEIVE_COMMAND(Server, PACKET_UDP_CLIENT_GET_NEWGRFS)
00166 {
00167   uint8 num_grfs;
00168   uint i;
00169 
00170   const GRFConfig *in_reply[NETWORK_MAX_GRF_COUNT];
00171   uint8 in_reply_count = 0;
00172   size_t packet_len = 0;
00173 
00174   DEBUG(net, 6, "[udp] newgrf data request from %s", client_addr->GetAddressAsString());
00175 
00176   num_grfs = p->Recv_uint8 ();
00177   if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
00178 
00179   for (i = 0; i < num_grfs; i++) {
00180     GRFConfig c;
00181     const GRFConfig *f;
00182 
00183     this->Recv_GRFIdentifier(p, &c);
00184 
00185     /* Find the matching GRF file */
00186     f = FindGRFConfig(c.grfid, c.md5sum);
00187     if (f == NULL) continue; // The GRF is unknown to this server
00188 
00189     /* If the reply might exceed the size of the packet, only reply
00190      * the current list and do not send the other data.
00191      * The name could be an empty string, if so take the filename. */
00192     packet_len += sizeof(c.grfid) + sizeof(c.md5sum) +
00193         min(strlen((!StrEmpty(f->name)) ? f->name : f->filename) + 1, (size_t)NETWORK_GRF_NAME_LENGTH);
00194     if (packet_len > SEND_MTU - 4) { // 4 is 3 byte header + grf count in reply
00195       break;
00196     }
00197     in_reply[in_reply_count] = f;
00198     in_reply_count++;
00199   }
00200 
00201   if (in_reply_count == 0) return;
00202 
00203   Packet packet(PACKET_UDP_SERVER_NEWGRFS);
00204   packet.Send_uint8(in_reply_count);
00205   for (i = 0; i < in_reply_count; i++) {
00206     char name[NETWORK_GRF_NAME_LENGTH];
00207 
00208     /* The name could be an empty string, if so take the filename */
00209     strecpy(name, (!StrEmpty(in_reply[i]->name)) ? in_reply[i]->name : in_reply[i]->filename, lastof(name));
00210     this->Send_GRFIdentifier(&packet, in_reply[i]);
00211     packet.Send_string(name);
00212   }
00213 
00214   this->SendPacket(&packet, client_addr);
00215 }
00216 
00218 
00219 class ClientNetworkUDPSocketHandler : public NetworkUDPSocketHandler {
00220 protected:
00221   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE);
00222   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST);
00223   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS);
00224   virtual void HandleIncomingNetworkGameInfoGRFConfig(GRFConfig *config);
00225 public:
00226   virtual ~ClientNetworkUDPSocketHandler() {}
00227 };
00228 
00229 DEF_UDP_RECEIVE_COMMAND(Client, PACKET_UDP_SERVER_RESPONSE)
00230 {
00231   NetworkGameList *item;
00232 
00233   /* Just a fail-safe.. should never happen */
00234   if (_network_udp_server) return;
00235 
00236   DEBUG(net, 4, "[udp] server response from %s", client_addr->GetAddressAsString());
00237 
00238   /* Find next item */
00239   item = NetworkGameListAddItem(*client_addr);
00240 
00241   ClearGRFConfigList(&item->info.grfconfig);
00242   this->Recv_NetworkGameInfo(p, &item->info);
00243 
00244   item->info.compatible = true;
00245   {
00246     /* Checks whether there needs to be a request for names of GRFs and makes
00247      * the request if necessary. GRFs that need to be requested are the GRFs
00248      * that do not exist on the clients system and we do not have the name
00249      * resolved of, i.e. the name is still UNKNOWN_GRF_NAME_PLACEHOLDER.
00250      * The in_request array and in_request_count are used so there is no need
00251      * to do a second loop over the GRF list, which can be relatively expensive
00252      * due to the string comparisons. */
00253     const GRFConfig *in_request[NETWORK_MAX_GRF_COUNT];
00254     const GRFConfig *c;
00255     uint in_request_count = 0;
00256 
00257     for (c = item->info.grfconfig; c != NULL; c = c->next) {
00258       if (c->status == GCS_NOT_FOUND) item->info.compatible = false;
00259       if (c->status != GCS_NOT_FOUND || strcmp(c->name, UNKNOWN_GRF_NAME_PLACEHOLDER) != 0) continue;
00260       in_request[in_request_count] = c;
00261       in_request_count++;
00262     }
00263 
00264     if (in_request_count > 0) {
00265       /* There are 'unknown' GRFs, now send a request for them */
00266       uint i;
00267       Packet packet(PACKET_UDP_CLIENT_GET_NEWGRFS);
00268 
00269       packet.Send_uint8(in_request_count);
00270       for (i = 0; i < in_request_count; i++) {
00271         this->Send_GRFIdentifier(&packet, in_request[i]);
00272       }
00273 
00274       this->SendPacket(&packet, &item->address);
00275     }
00276   }
00277 
00278   if (item->info.hostname[0] == '\0') {
00279     snprintf(item->info.hostname, sizeof(item->info.hostname), "%s", client_addr->GetHostname());
00280   }
00281 
00282   if (client_addr->GetAddress()->ss_family == AF_INET6) {
00283     strecat(item->info.server_name, " (IPv6)", lastof(item->info.server_name));
00284   }
00285 
00286   /* Check if we are allowed on this server based on the revision-match */
00287   item->info.version_compatible = IsNetworkCompatibleVersion(item->info.server_revision);
00288   item->info.compatible &= item->info.version_compatible; // Already contains match for GRFs
00289 
00290   item->online = true;
00291 
00292   UpdateNetworkGameWindow(false);
00293 }
00294 
00295 DEF_UDP_RECEIVE_COMMAND(Client, PACKET_UDP_MASTER_RESPONSE_LIST)
00296 {
00297   /* packet begins with the protocol version (uint8)
00298    * then an uint16 which indicates how many
00299    * ip:port pairs are in this packet, after that
00300    * an uint32 (ip) and an uint16 (port) for each pair.
00301    */
00302 
00303   ServerListType type = (ServerListType)(p->Recv_uint8() - 1);
00304 
00305   if (type < SLT_END) {
00306     for (int i = p->Recv_uint16(); i != 0 ; i--) {
00307       sockaddr_storage addr_storage;
00308       memset(&addr_storage, 0, sizeof(addr_storage));
00309 
00310       if (type == SLT_IPv4) {
00311         addr_storage.ss_family = AF_INET;
00312         ((sockaddr_in*)&addr_storage)->sin_addr.s_addr = TO_LE32(p->Recv_uint32());
00313       } else {
00314         assert(type == SLT_IPv6);
00315         addr_storage.ss_family = AF_INET6;
00316         byte *addr = (byte*)&((sockaddr_in6*)&addr_storage)->sin6_addr;
00317         for (uint i = 0; i < sizeof(in6_addr); i++) *addr++ = p->Recv_uint8();
00318       }
00319       NetworkAddress addr(addr_storage, type == SLT_IPv4 ? sizeof(sockaddr_in) : sizeof(sockaddr_in6));
00320       addr.SetPort(p->Recv_uint16());
00321 
00322       /* Somehow we reached the end of the packet */
00323       if (this->HasClientQuit()) return;
00324 
00325       NetworkUDPQueryServer(addr);
00326     }
00327   }
00328 }
00329 
00331 DEF_UDP_RECEIVE_COMMAND(Client, PACKET_UDP_SERVER_NEWGRFS)
00332 {
00333   uint8 num_grfs;
00334   uint i;
00335 
00336   DEBUG(net, 6, "[udp] newgrf data reply from %s", client_addr->GetAddressAsString());
00337 
00338   num_grfs = p->Recv_uint8 ();
00339   if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
00340 
00341   for (i = 0; i < num_grfs; i++) {
00342     char *unknown_name;
00343     char name[NETWORK_GRF_NAME_LENGTH];
00344     GRFConfig c;
00345 
00346     this->Recv_GRFIdentifier(p, &c);
00347     p->Recv_string(name, sizeof(name));
00348 
00349     /* An empty name is not possible under normal circumstances
00350      * and causes problems when showing the NewGRF list. */
00351     if (StrEmpty(name)) continue;
00352 
00353     /* Finds the fake GRFConfig for the just read GRF ID and MD5sum tuple.
00354      * If it exists and not resolved yet, then name of the fake GRF is
00355      * overwritten with the name from the reply. */
00356     unknown_name = FindUnknownGRFName(c.grfid, c.md5sum, false);
00357     if (unknown_name != NULL && strcmp(unknown_name, UNKNOWN_GRF_NAME_PLACEHOLDER) == 0) {
00358       ttd_strlcpy(unknown_name, name, NETWORK_GRF_NAME_LENGTH);
00359     }
00360   }
00361 }
00362 
00363 void ClientNetworkUDPSocketHandler::HandleIncomingNetworkGameInfoGRFConfig(GRFConfig *config)
00364 {
00365   /* Find the matching GRF file */
00366   const GRFConfig *f = FindGRFConfig(config->grfid, config->md5sum);
00367   if (f == NULL) {
00368     /* Don't know the GRF, so mark game incompatible and the (possibly)
00369      * already resolved name for this GRF (another server has sent the
00370      * name of the GRF already */
00371     config->name   = FindUnknownGRFName(config->grfid, config->md5sum, true);
00372     config->status = GCS_NOT_FOUND;
00373   } else {
00374     config->filename  = f->filename;
00375     config->name      = f->name;
00376     config->info      = f->info;
00377   }
00378   SetBit(config->flags, GCF_COPY);
00379 }
00380 
00381 /* Broadcast to all ips */
00382 static void NetworkUDPBroadCast(NetworkUDPSocketHandler *socket)
00383 {
00384   for (NetworkAddress *addr = _broadcast_list.Begin(); addr != _broadcast_list.End(); addr++) {
00385     Packet p(PACKET_UDP_CLIENT_FIND_SERVER);
00386 
00387     DEBUG(net, 4, "[udp] broadcasting to %s", addr->GetHostname());
00388 
00389     socket->SendPacket(&p, addr, true, true);
00390   }
00391 }
00392 
00393 
00394 /* Request the the server-list from the master server */
00395 void NetworkUDPQueryMasterServer()
00396 {
00397   Packet p(PACKET_UDP_CLIENT_GET_LIST);
00398   NetworkAddress out_addr(NETWORK_MASTER_SERVER_HOST, NETWORK_MASTER_SERVER_PORT);
00399 
00400   /* packet only contains protocol version */
00401   p.Send_uint8(NETWORK_MASTER_SERVER_VERSION);
00402   p.Send_uint8(SLT_AUTODETECT);
00403 
00404   _udp_client_socket->SendPacket(&p, &out_addr, true);
00405 
00406   DEBUG(net, 2, "[udp] master server queried at %s", out_addr.GetAddressAsString());
00407 }
00408 
00409 /* Find all servers */
00410 void NetworkUDPSearchGame()
00411 {
00412   /* We are still searching.. */
00413   if (_network_udp_broadcast > 0) return;
00414 
00415   DEBUG(net, 0, "[udp] searching server");
00416 
00417   NetworkUDPBroadCast(_udp_client_socket);
00418   _network_udp_broadcast = 300; // Stay searching for 300 ticks
00419 }
00420 
00422 struct NetworkUDPQueryServerInfo : NetworkAddress {
00423   bool manually; 
00424   NetworkUDPQueryServerInfo(const NetworkAddress &address, bool manually) :
00425     NetworkAddress(address),
00426     manually(manually)
00427   {
00428   }
00429 };
00430 
00435 static void NetworkUDPQueryServerThread(void *pntr)
00436 {
00437   NetworkUDPQueryServerInfo *info = (NetworkUDPQueryServerInfo*)pntr;
00438 
00439   /* Clear item in gamelist */
00440   NetworkGameList *item = CallocT<NetworkGameList>(1);
00441   item->address = *info;
00442   info->GetAddressAsString(item->info.server_name, lastof(item->info.server_name));
00443   strecpy(item->info.hostname, info->GetHostname(), lastof(item->info.hostname));
00444   item->manually = info->manually;
00445   NetworkGameListAddItemDelayed(item);
00446 
00447   _network_udp_mutex->BeginCritical();
00448   /* Init the packet */
00449   Packet p(PACKET_UDP_CLIENT_FIND_SERVER);
00450   if (_udp_client_socket != NULL) _udp_client_socket->SendPacket(&p, info);
00451   _network_udp_mutex->EndCritical();
00452 
00453   delete info;
00454 }
00455 
00456 void NetworkUDPQueryServer(NetworkAddress address, bool manually)
00457 {
00458   NetworkUDPQueryServerInfo *info = new NetworkUDPQueryServerInfo(address, manually);
00459   if (address.IsResolved() || !ThreadObject::New(NetworkUDPQueryServerThread, info)) {
00460     NetworkUDPQueryServerThread(info);
00461   }
00462 }
00463 
00464 static void NetworkUDPRemoveAdvertiseThread(void *pntr)
00465 {
00466   DEBUG(net, 1, "[udp] removing advertise from master server");
00467 
00468   /* Find somewhere to send */
00469   NetworkAddress out_addr(NETWORK_MASTER_SERVER_HOST, NETWORK_MASTER_SERVER_PORT);
00470 
00471   /* Send the packet */
00472   Packet p(PACKET_UDP_SERVER_UNREGISTER);
00473   /* Packet is: Version, server_port */
00474   p.Send_uint8 (NETWORK_MASTER_SERVER_VERSION);
00475   p.Send_uint16(_settings_client.network.server_port);
00476 
00477   _network_udp_mutex->BeginCritical();
00478   if (_udp_master_socket != NULL) _udp_master_socket->SendPacket(&p, &out_addr, true);
00479   _network_udp_mutex->EndCritical();
00480 }
00481 
00486 void NetworkUDPRemoveAdvertise(bool blocking)
00487 {
00488   /* Check if we are advertising */
00489   if (!_networking || !_network_server || !_network_udp_server) return;
00490 
00491   if (blocking || !ThreadObject::New(NetworkUDPRemoveAdvertiseThread, NULL)) {
00492     NetworkUDPRemoveAdvertiseThread(NULL);
00493   }
00494 }
00495 
00496 static void NetworkUDPAdvertiseThread(void *pntr)
00497 {
00498   /* Find somewhere to send */
00499   NetworkAddress out_addr(NETWORK_MASTER_SERVER_HOST, NETWORK_MASTER_SERVER_PORT);
00500 
00501   DEBUG(net, 1, "[udp] advertising to master server");
00502 
00503   /* Add a bit more messaging when we cannot get a session key */
00504   static byte session_key_retries = 0;
00505   if (_session_key == 0 && session_key_retries++ == 2) {
00506     DEBUG(net, 0, "[udp] advertising to the master server is failing");
00507     DEBUG(net, 0, "[udp]   we are not receiving the session key from the server");
00508     DEBUG(net, 0, "[udp]   please allow udp packets from %s to you to be delivered", out_addr.GetAddressAsString(false));
00509     DEBUG(net, 0, "[udp]   please allow udp packets from you to %s to be delivered", out_addr.GetAddressAsString(false));
00510   }
00511   if (_session_key != 0 && _network_advertise_retries == 0) {
00512     DEBUG(net, 0, "[udp] advertising to the master server is failing");
00513     DEBUG(net, 0, "[udp]   we are not receiving the acknowledgement from the server");
00514     DEBUG(net, 0, "[udp]   this usually means that the master server cannot reach us");
00515     DEBUG(net, 0, "[udp]   please allow udp and tcp packets to port %u to be delivered", _settings_client.network.server_port);
00516     DEBUG(net, 0, "[udp]   please allow udp and tcp packets from port %u to be delivered", _settings_client.network.server_port);
00517   }
00518 
00519   /* Send the packet */
00520   Packet p(PACKET_UDP_SERVER_REGISTER);
00521   /* Packet is: WELCOME_MESSAGE, Version, server_port */
00522   p.Send_string(NETWORK_MASTER_SERVER_WELCOME_MESSAGE);
00523   p.Send_uint8 (NETWORK_MASTER_SERVER_VERSION);
00524   p.Send_uint16(_settings_client.network.server_port);
00525   p.Send_uint64(_session_key);
00526 
00527   _network_udp_mutex->BeginCritical();
00528   if (_udp_master_socket != NULL) _udp_master_socket->SendPacket(&p, &out_addr, true);
00529   _network_udp_mutex->EndCritical();
00530 }
00531 
00532 /* Register us to the master server
00533  *   This function checks if it needs to send an advertise */
00534 void NetworkUDPAdvertise()
00535 {
00536   /* Check if we should send an advertise */
00537   if (!_networking || !_network_server || !_network_udp_server || !_settings_client.network.server_advertise)
00538     return;
00539 
00540   if (_network_need_advertise) {
00541     _network_need_advertise = false;
00542     _network_advertise_retries = ADVERTISE_RETRY_TIMES;
00543   } else {
00544     /* Only send once every ADVERTISE_NORMAL_INTERVAL ticks */
00545     if (_network_advertise_retries == 0) {
00546       if ((_network_last_advertise_frame + ADVERTISE_NORMAL_INTERVAL) > _frame_counter)
00547         return;
00548       _network_advertise_retries = ADVERTISE_RETRY_TIMES;
00549     }
00550 
00551     if ((_network_last_advertise_frame + ADVERTISE_RETRY_INTERVAL) > _frame_counter)
00552       return;
00553   }
00554 
00555   _network_advertise_retries--;
00556   _network_last_advertise_frame = _frame_counter;
00557 
00558   if (!ThreadObject::New(NetworkUDPAdvertiseThread, NULL)) {
00559     NetworkUDPAdvertiseThread(NULL);
00560   }
00561 }
00562 
00563 void NetworkUDPInitialize()
00564 {
00565   /* If not closed, then do it. */
00566   if (_udp_server_socket != NULL) NetworkUDPClose();
00567 
00568   DEBUG(net, 1, "[udp] initializing listeners");
00569   assert(_udp_client_socket == NULL && _udp_server_socket == NULL && _udp_master_socket == NULL);
00570 
00571   _network_udp_mutex->BeginCritical();
00572 
00573   _udp_client_socket = new ClientNetworkUDPSocketHandler();
00574 
00575   NetworkAddressList server;
00576   GetBindAddresses(&server, _settings_client.network.server_port);
00577   _udp_server_socket = new ServerNetworkUDPSocketHandler(&server);
00578 
00579   server.Clear();
00580   GetBindAddresses(&server, 0);
00581   _udp_master_socket = new MasterNetworkUDPSocketHandler(&server);
00582 
00583   _network_udp_server = false;
00584   _network_udp_broadcast = 0;
00585   _network_udp_mutex->EndCritical();
00586 }
00587 
00588 void NetworkUDPClose()
00589 {
00590   _network_udp_mutex->BeginCritical();
00591   _udp_server_socket->Close();
00592   _udp_master_socket->Close();
00593   _udp_client_socket->Close();
00594   delete _udp_client_socket;
00595   delete _udp_server_socket;
00596   delete _udp_master_socket;
00597   _udp_client_socket = NULL;
00598   _udp_server_socket = NULL;
00599   _udp_master_socket = NULL;
00600   _network_udp_mutex->EndCritical();
00601 
00602   _network_udp_server = false;
00603   _network_udp_broadcast = 0;
00604   DEBUG(net, 1, "[udp] closed listeners");
00605 }
00606 
00607 #endif /* ENABLE_NETWORK */

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