network_udp.cpp

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00001 /* $Id: network_udp.cpp 18809 2010-01-15 16:41:15Z 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 "../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((f->name != NULL && !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, (in_reply[i]->name != NULL && !StrEmpty(in_reply[i]->name)) ?
00210         in_reply[i]->name : in_reply[i]->filename, lastof(name));
00211     this->Send_GRFIdentifier(&packet, in_reply[i]);
00212     packet.Send_string(name);
00213   }
00214 
00215   this->SendPacket(&packet, client_addr);
00216 }
00217 
00219 
00220 class ClientNetworkUDPSocketHandler : public NetworkUDPSocketHandler {
00221 protected:
00222   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_RESPONSE);
00223   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_MASTER_RESPONSE_LIST);
00224   DECLARE_UDP_RECEIVE_COMMAND(PACKET_UDP_SERVER_NEWGRFS);
00225   virtual void HandleIncomingNetworkGameInfoGRFConfig(GRFConfig *config);
00226 public:
00227   virtual ~ClientNetworkUDPSocketHandler() {}
00228 };
00229 
00230 DEF_UDP_RECEIVE_COMMAND(Client, PACKET_UDP_SERVER_RESPONSE)
00231 {
00232   NetworkGameList *item;
00233 
00234   /* Just a fail-safe.. should never happen */
00235   if (_network_udp_server) return;
00236 
00237   DEBUG(net, 4, "[udp] server response from %s", client_addr->GetAddressAsString());
00238 
00239   /* Find next item */
00240   item = NetworkGameListAddItem(*client_addr);
00241 
00242   ClearGRFConfigList(&item->info.grfconfig);
00243   this->Recv_NetworkGameInfo(p, &item->info);
00244 
00245   item->info.compatible = true;
00246   {
00247     /* Checks whether there needs to be a request for names of GRFs and makes
00248      * the request if necessary. GRFs that need to be requested are the GRFs
00249      * that do not exist on the clients system and we do not have the name
00250      * resolved of, i.e. the name is still UNKNOWN_GRF_NAME_PLACEHOLDER.
00251      * The in_request array and in_request_count are used so there is no need
00252      * to do a second loop over the GRF list, which can be relatively expensive
00253      * due to the string comparisons. */
00254     const GRFConfig *in_request[NETWORK_MAX_GRF_COUNT];
00255     const GRFConfig *c;
00256     uint in_request_count = 0;
00257 
00258     for (c = item->info.grfconfig; c != NULL; c = c->next) {
00259       if (c->status == GCS_NOT_FOUND) item->info.compatible = false;
00260       if (c->status != GCS_NOT_FOUND || strcmp(c->name, UNKNOWN_GRF_NAME_PLACEHOLDER) != 0) continue;
00261       in_request[in_request_count] = c;
00262       in_request_count++;
00263     }
00264 
00265     if (in_request_count > 0) {
00266       /* There are 'unknown' GRFs, now send a request for them */
00267       uint i;
00268       Packet packet(PACKET_UDP_CLIENT_GET_NEWGRFS);
00269 
00270       packet.Send_uint8(in_request_count);
00271       for (i = 0; i < in_request_count; i++) {
00272         this->Send_GRFIdentifier(&packet, in_request[i]);
00273       }
00274 
00275       this->SendPacket(&packet, &item->address);
00276     }
00277   }
00278 
00279   if (item->info.hostname[0] == '\0') {
00280     snprintf(item->info.hostname, sizeof(item->info.hostname), "%s", client_addr->GetHostname());
00281   }
00282 
00283   if (client_addr->GetAddress()->ss_family == AF_INET6) {
00284     strecat(item->info.server_name, " (IPv6)", lastof(item->info.server_name));
00285   }
00286 
00287   /* Check if we are allowed on this server based on the revision-match */
00288   item->info.version_compatible = IsNetworkCompatibleVersion(item->info.server_revision);
00289   item->info.compatible &= item->info.version_compatible; // Already contains match for GRFs
00290 
00291   item->online = true;
00292 
00293   UpdateNetworkGameWindow(false);
00294 }
00295 
00296 DEF_UDP_RECEIVE_COMMAND(Client, PACKET_UDP_MASTER_RESPONSE_LIST)
00297 {
00298   /* packet begins with the protocol version (uint8)
00299    * then an uint16 which indicates how many
00300    * ip:port pairs are in this packet, after that
00301    * an uint32 (ip) and an uint16 (port) for each pair.
00302    */
00303 
00304   ServerListType type = (ServerListType)(p->Recv_uint8() - 1);
00305 
00306   if (type < SLT_END) {
00307     for (int i = p->Recv_uint16(); i != 0 ; i--) {
00308       sockaddr_storage addr_storage;
00309       memset(&addr_storage, 0, sizeof(addr_storage));
00310 
00311       if (type == SLT_IPv4) {
00312         addr_storage.ss_family = AF_INET;
00313         ((sockaddr_in*)&addr_storage)->sin_addr.s_addr = TO_LE32(p->Recv_uint32());
00314       } else {
00315         assert(type == SLT_IPv6);
00316         addr_storage.ss_family = AF_INET6;
00317         byte *addr = (byte*)&((sockaddr_in6*)&addr_storage)->sin6_addr;
00318         for (uint i = 0; i < sizeof(in6_addr); i++) *addr++ = p->Recv_uint8();
00319       }
00320       NetworkAddress addr(addr_storage, type == SLT_IPv4 ? sizeof(sockaddr_in) : sizeof(sockaddr_in6));
00321       addr.SetPort(p->Recv_uint16());
00322 
00323       /* Somehow we reached the end of the packet */
00324       if (this->HasClientQuit()) return;
00325 
00326       NetworkUDPQueryServer(addr);
00327     }
00328   }
00329 }
00330 
00332 DEF_UDP_RECEIVE_COMMAND(Client, PACKET_UDP_SERVER_NEWGRFS)
00333 {
00334   uint8 num_grfs;
00335   uint i;
00336 
00337   DEBUG(net, 6, "[udp] newgrf data reply from %s", client_addr->GetAddressAsString());
00338 
00339   num_grfs = p->Recv_uint8 ();
00340   if (num_grfs > NETWORK_MAX_GRF_COUNT) return;
00341 
00342   for (i = 0; i < num_grfs; i++) {
00343     char *unknown_name;
00344     char name[NETWORK_GRF_NAME_LENGTH];
00345     GRFConfig c;
00346 
00347     this->Recv_GRFIdentifier(p, &c);
00348     p->Recv_string(name, sizeof(name));
00349 
00350     /* An empty name is not possible under normal circumstances
00351      * and causes problems when showing the NewGRF list. */
00352     if (StrEmpty(name)) continue;
00353 
00354     /* Finds the fake GRFConfig for the just read GRF ID and MD5sum tuple.
00355      * If it exists and not resolved yet, then name of the fake GRF is
00356      * overwritten with the name from the reply. */
00357     unknown_name = FindUnknownGRFName(c.grfid, c.md5sum, false);
00358     if (unknown_name != NULL && strcmp(unknown_name, UNKNOWN_GRF_NAME_PLACEHOLDER) == 0) {
00359       ttd_strlcpy(unknown_name, name, NETWORK_GRF_NAME_LENGTH);
00360     }
00361   }
00362 }
00363 
00364 void ClientNetworkUDPSocketHandler::HandleIncomingNetworkGameInfoGRFConfig(GRFConfig *config)
00365 {
00366   /* Find the matching GRF file */
00367   const GRFConfig *f = FindGRFConfig(config->grfid, config->md5sum);
00368   if (f == NULL) {
00369     /* Don't know the GRF, so mark game incompatible and the (possibly)
00370      * already resolved name for this GRF (another server has sent the
00371      * name of the GRF already */
00372     config->name   = FindUnknownGRFName(config->grfid, config->md5sum, true);
00373     config->status = GCS_NOT_FOUND;
00374   } else {
00375     config->filename  = f->filename;
00376     config->name      = f->name;
00377     config->info      = f->info;
00378   }
00379   SetBit(config->flags, GCF_COPY);
00380 }
00381 
00382 /* Broadcast to all ips */
00383 static void NetworkUDPBroadCast(NetworkUDPSocketHandler *socket)
00384 {
00385   for (NetworkAddress *addr = _broadcast_list.Begin(); addr != _broadcast_list.End(); addr++) {
00386     Packet p(PACKET_UDP_CLIENT_FIND_SERVER);
00387 
00388     DEBUG(net, 4, "[udp] broadcasting to %s", addr->GetHostname());
00389 
00390     socket->SendPacket(&p, addr, true, true);
00391   }
00392 }
00393 
00394 
00395 /* Request the the server-list from the master server */
00396 void NetworkUDPQueryMasterServer()
00397 {
00398   Packet p(PACKET_UDP_CLIENT_GET_LIST);
00399   NetworkAddress out_addr(NETWORK_MASTER_SERVER_HOST, NETWORK_MASTER_SERVER_PORT);
00400 
00401   /* packet only contains protocol version */
00402   p.Send_uint8(NETWORK_MASTER_SERVER_VERSION);
00403   p.Send_uint8(SLT_AUTODETECT);
00404 
00405   _udp_client_socket->SendPacket(&p, &out_addr, true);
00406 
00407   DEBUG(net, 2, "[udp] master server queried at %s", out_addr.GetAddressAsString());
00408 }
00409 
00410 /* Find all servers */
00411 void NetworkUDPSearchGame()
00412 {
00413   /* We are still searching.. */
00414   if (_network_udp_broadcast > 0) return;
00415 
00416   DEBUG(net, 0, "[udp] searching server");
00417 
00418   NetworkUDPBroadCast(_udp_client_socket);
00419   _network_udp_broadcast = 300; // Stay searching for 300 ticks
00420 }
00421 
00423 struct NetworkUDPQueryServerInfo : NetworkAddress {
00424   bool manually; 
00425   NetworkUDPQueryServerInfo(const NetworkAddress &address, bool manually) :
00426     NetworkAddress(address),
00427     manually(manually)
00428   {
00429   }
00430 };
00431 
00436 static void NetworkUDPQueryServerThread(void *pntr)
00437 {
00438   NetworkUDPQueryServerInfo *info = (NetworkUDPQueryServerInfo*)pntr;
00439 
00440   /* Clear item in gamelist */
00441   NetworkGameList *item = CallocT<NetworkGameList>(1);
00442   item->address = *info;
00443   info->GetAddressAsString(item->info.server_name, lastof(item->info.server_name));
00444   strecpy(item->info.hostname, info->GetHostname(), lastof(item->info.hostname));
00445   item->manually = info->manually;
00446   NetworkGameListAddItemDelayed(item);
00447 
00448   _network_udp_mutex->BeginCritical();
00449   /* Init the packet */
00450   Packet p(PACKET_UDP_CLIENT_FIND_SERVER);
00451   if (_udp_client_socket != NULL) _udp_client_socket->SendPacket(&p, info);
00452   _network_udp_mutex->EndCritical();
00453 
00454   delete info;
00455 }
00456 
00457 void NetworkUDPQueryServer(NetworkAddress address, bool manually)
00458 {
00459   NetworkUDPQueryServerInfo *info = new NetworkUDPQueryServerInfo(address, manually);
00460   if (address.IsResolved() || !ThreadObject::New(NetworkUDPQueryServerThread, info)) {
00461     NetworkUDPQueryServerThread(info);
00462   }
00463 }
00464 
00465 static void NetworkUDPRemoveAdvertiseThread(void *pntr)
00466 {
00467   DEBUG(net, 1, "[udp] removing advertise from master server");
00468 
00469   /* Find somewhere to send */
00470   NetworkAddress out_addr(NETWORK_MASTER_SERVER_HOST, NETWORK_MASTER_SERVER_PORT);
00471 
00472   /* Send the packet */
00473   Packet p(PACKET_UDP_SERVER_UNREGISTER);
00474   /* Packet is: Version, server_port */
00475   p.Send_uint8 (NETWORK_MASTER_SERVER_VERSION);
00476   p.Send_uint16(_settings_client.network.server_port);
00477 
00478   _network_udp_mutex->BeginCritical();
00479   if (_udp_master_socket != NULL) _udp_master_socket->SendPacket(&p, &out_addr, true);
00480   _network_udp_mutex->EndCritical();
00481 }
00482 
00487 void NetworkUDPRemoveAdvertise(bool blocking)
00488 {
00489   /* Check if we are advertising */
00490   if (!_networking || !_network_server || !_network_udp_server) return;
00491 
00492   if (blocking || !ThreadObject::New(NetworkUDPRemoveAdvertiseThread, NULL)) {
00493     NetworkUDPRemoveAdvertiseThread(NULL);
00494   }
00495 }
00496 
00497 static void NetworkUDPAdvertiseThread(void *pntr)
00498 {
00499   /* Find somewhere to send */
00500   NetworkAddress out_addr(NETWORK_MASTER_SERVER_HOST, NETWORK_MASTER_SERVER_PORT);
00501 
00502   DEBUG(net, 1, "[udp] advertising to master server");
00503 
00504   /* Add a bit more messaging when we cannot get a session key */
00505   static byte session_key_retries = 0;
00506   if (_session_key == 0 && session_key_retries++ == 2) {
00507     DEBUG(net, 0, "[udp] advertising to the master server is failing");
00508     DEBUG(net, 0, "[udp]   we are not receiving the session key from the server");
00509     DEBUG(net, 0, "[udp]   please allow udp packets from %s to you to be delivered", out_addr.GetAddressAsString(false));
00510     DEBUG(net, 0, "[udp]   please allow udp packets from you to %s to be delivered", out_addr.GetAddressAsString(false));
00511   }
00512   if (_session_key != 0 && _network_advertise_retries == 0) {
00513     DEBUG(net, 0, "[udp] advertising to the master server is failing");
00514     DEBUG(net, 0, "[udp]   we are not receiving the acknowledgement from the server");
00515     DEBUG(net, 0, "[udp]   this usually means that the master server cannot reach us");
00516     DEBUG(net, 0, "[udp]   please allow udp and tcp packets to port %u to be delivered", _settings_client.network.server_port);
00517     DEBUG(net, 0, "[udp]   please allow udp and tcp packets from port %u to be delivered", _settings_client.network.server_port);
00518   }
00519 
00520   /* Send the packet */
00521   Packet p(PACKET_UDP_SERVER_REGISTER);
00522   /* Packet is: WELCOME_MESSAGE, Version, server_port */
00523   p.Send_string(NETWORK_MASTER_SERVER_WELCOME_MESSAGE);
00524   p.Send_uint8 (NETWORK_MASTER_SERVER_VERSION);
00525   p.Send_uint16(_settings_client.network.server_port);
00526   p.Send_uint64(_session_key);
00527 
00528   _network_udp_mutex->BeginCritical();
00529   if (_udp_master_socket != NULL) _udp_master_socket->SendPacket(&p, &out_addr, true);
00530   _network_udp_mutex->EndCritical();
00531 }
00532 
00533 /* Register us to the master server
00534  *   This function checks if it needs to send an advertise */
00535 void NetworkUDPAdvertise()
00536 {
00537   /* Check if we should send an advertise */
00538   if (!_networking || !_network_server || !_network_udp_server || !_settings_client.network.server_advertise)
00539     return;
00540 
00541   if (_network_need_advertise) {
00542     _network_need_advertise = false;
00543     _network_advertise_retries = ADVERTISE_RETRY_TIMES;
00544   } else {
00545     /* Only send once every ADVERTISE_NORMAL_INTERVAL ticks */
00546     if (_network_advertise_retries == 0) {
00547       if ((_network_last_advertise_frame + ADVERTISE_NORMAL_INTERVAL) > _frame_counter)
00548         return;
00549       _network_advertise_retries = ADVERTISE_RETRY_TIMES;
00550     }
00551 
00552     if ((_network_last_advertise_frame + ADVERTISE_RETRY_INTERVAL) > _frame_counter)
00553       return;
00554   }
00555 
00556   _network_advertise_retries--;
00557   _network_last_advertise_frame = _frame_counter;
00558 
00559   if (!ThreadObject::New(NetworkUDPAdvertiseThread, NULL)) {
00560     NetworkUDPAdvertiseThread(NULL);
00561   }
00562 }
00563 
00564 void NetworkUDPInitialize()
00565 {
00566   /* If not closed, then do it. */
00567   if (_udp_server_socket != NULL) NetworkUDPClose();
00568 
00569   DEBUG(net, 1, "[udp] initializing listeners");
00570   assert(_udp_client_socket == NULL && _udp_server_socket == NULL && _udp_master_socket == NULL);
00571 
00572   _network_udp_mutex->BeginCritical();
00573 
00574   _udp_client_socket = new ClientNetworkUDPSocketHandler();
00575 
00576   NetworkAddressList server;
00577   GetBindAddresses(&server, _settings_client.network.server_port);
00578   _udp_server_socket = new ServerNetworkUDPSocketHandler(&server);
00579 
00580   server.Clear();
00581   GetBindAddresses(&server, 0);
00582   _udp_master_socket = new MasterNetworkUDPSocketHandler(&server);
00583 
00584   _network_udp_server = false;
00585   _network_udp_broadcast = 0;
00586   _network_udp_mutex->EndCritical();
00587 }
00588 
00589 void NetworkUDPClose()
00590 {
00591   _network_udp_mutex->BeginCritical();
00592   _udp_server_socket->Close();
00593   _udp_master_socket->Close();
00594   _udp_client_socket->Close();
00595   delete _udp_client_socket;
00596   delete _udp_server_socket;
00597   delete _udp_master_socket;
00598   _udp_client_socket = NULL;
00599   _udp_server_socket = NULL;
00600   _udp_master_socket = NULL;
00601   _network_udp_mutex->EndCritical();
00602 
00603   _network_udp_server = false;
00604   _network_udp_broadcast = 0;
00605   DEBUG(net, 1, "[udp] closed listeners");
00606 }
00607 
00608 #endif /* ENABLE_NETWORK */

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