src/modules/m_spanningtree/utils.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "configreader.h"
  16 #include "users.h"
  17 #include "channels.h"
  18 #include "modules.h"
  19 #include "commands/cmd_whois.h"
  20 #include "commands/cmd_stats.h"
  21 #include "socket.h"
  22 #include "wildcard.h"
  23 #include "xline.h"
  24 #include "transport.h"
  25 #include "socketengine.h"
  26
  27 #include "m_spanningtree/main.h"
  28 #include "m_spanningtree/utils.h"
  29 #include "m_spanningtree/treeserver.h"
  30 #include "m_spanningtree/link.h"
  31 #include "m_spanningtree/treesocket.h"
  32 #include "m_spanningtree/resolvers.h"
  33
  34 /* $ModDep: m_spanningtree/timesynctimer.h m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h */
  35
  36 /** Yay for fast searches!
  37  * This is hundreds of times faster than recursion
  38  * or even scanning a linked list, especially when
  39  * there are more than a few servers to deal with.
  40  * (read as: lots).
  41  */
  42 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  43 {
  44         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  45         if (iter != serverlist.end())
  46         {
  47                 return iter->second;
  48         }
  49         else
  50         {
  51                 return NULL;
  52         }
  53 }
  54
  55 TreeServer* SpanningTreeUtilities::FindRemoteBurstServer(TreeServer* Server)
  56 {
  57         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  58         if (iter != RemoteServersBursting.end())
  59                 return iter->second;
  60         else
  61                 return NULL;
  62 }
  63
  64 TreeSocket* SpanningTreeUtilities::FindBurstingServer(const std::string &ServerName)
  65 {
  66         std::map<irc::string,TreeSocket*>::iterator iter;
  67         iter = burstingserverlist.find(ServerName.c_str());
  68         if (iter != burstingserverlist.end())
  69         {
  70                 return iter->second;
  71         }
  72         else
  73         {
  74                 return NULL;
  75         }
  76 }
  77
  78 void SpanningTreeUtilities::SetRemoteBursting(TreeServer* Server, bool bursting)
  79 {
  80         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  81         if (bursting)
  82         {
  83                 if (iter == RemoteServersBursting.end())
  84                         RemoteServersBursting.insert(make_pair(Server->GetName(), Server));
  85                 else return;
  86         }
  87         else
  88         {
  89                 if (iter != RemoteServersBursting.end())
  90                         RemoteServersBursting.erase(iter);
  91                 else return;
  92         }
  93         ServerInstance->Log(DEBUG,"Server %s is %sbursting nicknames", Server->GetName().c_str(), bursting ? "" : "no longer ");
  94 }
  95
  96 void SpanningTreeUtilities::AddBurstingServer(const std::string &ServerName, TreeSocket* s)
  97 {
  98         std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.find(ServerName.c_str());
  99         if (iter == burstingserverlist.end())
 100                 burstingserverlist[ServerName.c_str()] = s;
 101 }
 102
 103 void SpanningTreeUtilities::DelBurstingServer(TreeSocket* s)
 104 {
 105          for (std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.begin(); iter != burstingserverlist.end(); iter++)
 106          {
 107                  if (iter->second == s)
 108                  {
 109                          burstingserverlist.erase(iter);
 110                          return;
 111                  }
 112          }
 113 }
 114
 115 /** Returns the locally connected server we must route a
 116  * message through to reach server 'ServerName'. This
 117  * only applies to one-to-one and not one-to-many routing.
 118  * See the comments for the constructor of TreeServer
 119  * for more details.
 120  */
 121 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
 122 {
 123         if (ServerName.c_str() == TreeRoot->GetName())
 124                 return NULL;
 125         TreeServer* Found = FindServer(ServerName);
 126         if (Found)
 127         {
 128                 return Found->GetRoute();
 129         }
 130         else
 131         {
 132                 return NULL;
 133         }
 134 }
 135
 136 /** Find the first server matching a given glob mask.
 137  * Theres no find-using-glob method of hash_map [awwww :-(]
 138  * so instead, we iterate over the list using an iterator
 139  * and match each one until we get a hit. Yes its slow,
 140  * deal with it.
 141  */
 142 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 143 {
 144         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 145         {
 146                 if (match(i->first.c_str(),ServerName.c_str()))
 147                         return i->second;
 148         }
 149         return NULL;
 150 }
 151
 152 /* A convenient wrapper that returns true if a server exists */
 153 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 154 {
 155         return (FindServer(ServerName) != NULL);
 156 }
 157
 158 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 159 {
 160         Bindings.clear();
 161
 162         lines_to_apply = 0;
 163
 164         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc);
 165
 166         modulelist* ml = ServerInstance->FindInterface("InspSocketHook");
 167
 168         /* Did we find any modules? */
 169         if (ml)
 170         {
 171                 /* Yes, enumerate them all to find out the hook name */
 172                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 173                 {
 174                         /* Make a request to it for its name, its implementing
 175                          * InspSocketHook so we know its safe to do this
 176                          */
 177                         std::string name = InspSocketNameRequest((Module*)Creator, *m).Send();
 178                         /* Build a map of them */
 179                         hooks[name.c_str()] = *m;
 180                         hooknames.push_back(name);
 181                 }
 182         }
 183
 184         this->ReadConfiguration(true);
 185 }
 186
 187 SpanningTreeUtilities::~SpanningTreeUtilities()
 188 {
 189         for (unsigned int i = 0; i < Bindings.size(); i++)
 190         {
 191                 ServerInstance->SE->DelFd(Bindings[i]);
 192                 Bindings[i]->Close();
 193         }
 194         while (TreeRoot->ChildCount())
 195         {
 196                 TreeServer* child_server = TreeRoot->GetChild(0);
 197                 if (child_server)
 198                 {
 199                         TreeSocket* sock = child_server->GetSocket();
 200                         ServerInstance->SE->DelFd(sock);
 201                         sock->Close();
 202                 }
 203         }
 204         delete TreeRoot;
 205 }
 206
 207 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 208 {
 209         if (list.find(server) == list.end())
 210                 list[server] = server;
 211 }
 212
 213 /* returns a list of DIRECT servernames for a specific channel */
 214 void SpanningTreeUtilities::GetListOfServersForChannel(chanrec* c, TreeServerList &list, char status, const CUList &exempt_list)
 215 {
 216         CUList *ulist;
 217         switch (status)
 218         {
 219                 case '@':
 220                         ulist = c->GetOppedUsers();
 221                 break;
 222                 case '%':
 223                         ulist = c->GetHalfoppedUsers();
 224                 break;
 225                 case '+':
 226                         ulist = c->GetVoicedUsers();
 227                 break;
 228                 default:
 229                         ulist = c->GetUsers();
 230                 break;
 231         }
 232         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 233         {
 234                 if ((i->first->GetFd() < 0) && (exempt_list.find(i->first) == exempt_list.end()))
 235                 {
 236                         TreeServer* best = this->BestRouteTo(i->first->server);
 237                         if (best)
 238                                 AddThisServer(best,list);
 239                 }
 240         }
 241         return;
 242 }
 243
 244 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 245 {
 246         char pfx = 0;
 247         TreeServer* omitroute = this->BestRouteTo(omit);
 248         if ((command == "NOTICE") || (command == "PRIVMSG"))
 249         {
 250                 if (params.size() >= 2)
 251                 {
 252                         /* Prefixes */
 253                         if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
 254                         {
 255                                 pfx = params[0][0];
 256                                 params[0] = params[0].substr(1, params[0].length()-1);
 257                         }
 258                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 259                         {
 260                                 // special routing for private messages/notices
 261                                 userrec* d = ServerInstance->FindNick(params[0]);
 262                                 if (d)
 263                                 {
 264                                         std::deque<std::string> par;
 265                                         par.push_back(params[0]);
 266                                         par.push_back(":"+params[1]);
 267                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 268                                         return true;
 269                                 }
 270                         }
 271                         else if (*(params[0].c_str()) == '$')
 272                         {
 273                                 std::deque<std::string> par;
 274                                 par.push_back(params[0]);
 275                                 par.push_back(":"+params[1]);
 276                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 277                                 return true;
 278                         }
 279                         else
 280                         {
 281                                 chanrec* c = ServerInstance->FindChan(params[0]);
 282                                 userrec* u = ServerInstance->FindNick(prefix);
 283                                 if (c && u)
 284                                 {
 285                                         CUList elist;
 286                                         TreeServerList list;
 287                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist));
 288                                         GetListOfServersForChannel(c,list,pfx,elist);
 289
 290                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 291                                         {
 292                                                 TreeSocket* Sock = i->second->GetSocket();
 293                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 294                                                 {
 295                                                         Sock->WriteLine(data);
 296                                                 }
 297                                         }
 298                                         return true;
 299                                 }
 300                         }
 301                 }
 302         }
 303         unsigned int items =this->TreeRoot->ChildCount();
 304         for (unsigned int x = 0; x < items; x++)
 305         {
 306                 TreeServer* Route = this->TreeRoot->GetChild(x);
 307                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 308                 {
 309                         TreeSocket* Sock = Route->GetSocket();
 310                         if (Sock)
 311                                 Sock->WriteLine(data);
 312                 }
 313         }
 314         return true;
 315 }
 316
 317 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 318 {
 319         TreeServer* omitroute = this->BestRouteTo(omit);
 320         std::string FullLine = ":" + prefix + " " + command;
 321         unsigned int words = params.size();
 322         for (unsigned int x = 0; x < words; x++)
 323         {
 324                 FullLine = FullLine + " " + params[x];
 325         }
 326         unsigned int items = this->TreeRoot->ChildCount();
 327         for (unsigned int x = 0; x < items; x++)
 328         {
 329                 TreeServer* Route = this->TreeRoot->GetChild(x);
 330                 // Send the line IF:
 331                 // The route has a socket (its a direct connection)
 332                 // The route isnt the one to be omitted
 333                 // The route isnt the path to the one to be omitted
 334                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 335                 {
 336                         TreeSocket* Sock = Route->GetSocket();
 337                         if (Sock)
 338                                 Sock->WriteLine(FullLine);
 339                 }
 340         }
 341         return true;
 342 }
 343
 344 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 345 {
 346         std::string FullLine = ":" + prefix + " " + command;
 347         unsigned int words = params.size();
 348         for (unsigned int x = 0; x < words; x++)
 349         {
 350                 FullLine = FullLine + " " + params[x];
 351         }
 352         unsigned int items = this->TreeRoot->ChildCount();
 353         for (unsigned int x = 0; x < items; x++)
 354         {
 355                 TreeServer* Route = this->TreeRoot->GetChild(x);
 356                 if (Route && Route->GetSocket())
 357                 {
 358                         TreeSocket* Sock = Route->GetSocket();
 359                         if (Sock)
 360                                 Sock->WriteLine(FullLine);
 361                 }
 362         }
 363         return true;
 364 }
 365
 366 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 367 {
 368         std::string spfx = prefix;
 369         std::string scmd = command;
 370         return this->DoOneToMany(spfx, scmd, params);
 371 }
 372
 373 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 374 {
 375         std::string spfx = prefix;
 376         std::string scmd = command;
 377         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 378 }
 379
 380 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 381 {
 382         TreeServer* Route = this->BestRouteTo(target);
 383         if (Route)
 384         {
 385                 std::string FullLine = ":" + prefix + " " + command;
 386                 unsigned int words = params.size();
 387                 for (unsigned int x = 0; x < words; x++)
 388                 {
 389                         FullLine = FullLine + " " + params[x];
 390                 }
 391                 if (Route && Route->GetSocket())
 392                 {
 393                         TreeSocket* Sock = Route->GetSocket();
 394                         if (Sock)
 395                                 Sock->WriteLine(FullLine);
 396                 }
 397                 return true;
 398         }
 399         else
 400         {
 401                 return false;
 402         }
 403 }
 404
 405 void SpanningTreeUtilities::RefreshIPCache()
 406 {
 407         ValidIPs.clear();
 408         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 409         {
 410                 if ((!L->IPAddr.empty()) && (!L->RecvPass.empty()) && (!L->SendPass.empty()) && (!L->Name.empty()) && (L->Port))
 411                 {
 412                         ValidIPs.push_back(L->IPAddr);
 413
 414                         if (L->AllowMask.length())
 415                                 ValidIPs.push_back(L->AllowMask);
 416
 417                         /* Needs resolving */
 418                         bool ipvalid = true;
 419                         QueryType start_type = DNS_QUERY_A;
 420 #ifdef IPV6
 421                         start_type = DNS_QUERY_AAAA;
 422                         if (strchr(L->IPAddr.c_str(),':'))
 423                         {
 424                                 in6_addr n;
 425                                 if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 426                                         ipvalid = false;
 427                         }
 428                         else
 429 #endif
 430                         {
 431                                 in_addr n;
 432                                 if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 433                                         ipvalid = false;
 434                         }
 435                         if (!ipvalid)
 436                         {
 437                                 try
 438                                 {
 439                                         bool cached;
 440                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 441                                         ServerInstance->AddResolver(sr, cached);
 442                                 }
 443                                 catch (...)
 444                                 {
 445                                 }
 446                         }
 447                 }
 448         }
 449 }
 450
 451 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 452 {
 453         ConfigReader* Conf = new ConfigReader(ServerInstance);
 454         if (rebind)
 455         {
 456                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 457                 {
 458                         std::string Type = Conf->ReadValue("bind","type",j);
 459                         std::string IP = Conf->ReadValue("bind","address",j);
 460                         std::string Port = Conf->ReadValue("bind","port",j);
 461                         std::string transport = Conf->ReadValue("bind","transport",j);
 462                         if (Type == "servers")
 463                         {
 464                                 irc::portparser portrange(Port, false);
 465                                 int portno = -1;
 466                                 while ((portno = portrange.GetToken()))
 467                                 {
 468                                         if (IP == "*")
 469                                                 IP.clear();
 470
 471                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 472                                         {
 473                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: WARNING: Can't find transport type '%s' for port %s:%s - maybe you forgot to load it BEFORE m_spanningtree in your config file? - Skipping this port binding", transport.c_str(), IP.c_str(), Port.c_str());
 474                                                 break;
 475                                         }
 476
 477                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 478                                         if (listener->GetState() == I_LISTENING)
 479                                         {
 480                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 481                                                 Bindings.push_back(listener);
 482                                         }
 483                                         else
 484                                         {
 485                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 486                                                 listener->Close();
 487                                         }
 488                                 }
 489                         }
 490                 }
 491         }
 492         FlatLinks = Conf->ReadFlag("options","flatlinks",0);
 493         HideULines = Conf->ReadFlag("options","hideulines",0);
 494         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 495         EnableTimeSync = Conf->ReadFlag("timesync","enable",0);
 496         MasterTime = Conf->ReadFlag("timesync", "master", 0);
 497         ChallengeResponse = !Conf->ReadFlag("options", "disablehmac", 0);
 498         quiet_bursts = Conf->ReadFlag("options", "quietbursts", 0);
 499         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 500
 501         if (PingWarnTime < 0 || PingWarnTime > 59)
 502                 PingWarnTime = 0;
 503
 504         LinkBlocks.clear();
 505         ValidIPs.clear();
 506         for (int j = 0; j < Conf->Enumerate("link"); j++)
 507         {
 508                 Link L;
 509                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 510                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 511                 L.AllowMask = Allow;
 512                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 513                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 514                 L.Port = Conf->ReadInteger("link", "port", j, true);
 515                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 516                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 517                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 518                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 519                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 520                 L.Hook = Conf->ReadValue("link", "transport", j);
 521                 L.Bind = Conf->ReadValue("link", "bind", j);
 522                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 523
 524                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 525                 {
 526                         ServerInstance->Log(DEFAULT,"m_spanningtree: WARNING: Can't find transport type '%s' for link '%s' - maybe you forgot to load it BEFORE m_spanningtree in your config file? Skipping <link> tag completely.",
 527                         L.Hook.c_str(), L.Name.c_str());
 528                         continue;
 529
 530                 }
 531
 532                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 533                 /* Bugfix by brain, do not allow people to enter bad configurations */
 534                 if (L.Name != ServerInstance->Config->ServerName)
 535                 {
 536                         if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 537                         {
 538                                 ValidIPs.push_back(L.IPAddr);
 539
 540                                 if (Allow.length())
 541                                         ValidIPs.push_back(Allow);
 542
 543                                 /* Needs resolving */
 544                                 bool ipvalid = true;
 545                                 QueryType start_type = DNS_QUERY_A;
 546 #ifdef IPV6
 547                                 start_type = DNS_QUERY_AAAA;
 548                                 if (strchr(L.IPAddr.c_str(),':'))
 549                                 {
 550                                         in6_addr n;
 551                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 552                                                 ipvalid = false;
 553                                 }
 554                                 else
 555                                 {
 556                                         in_addr n;
 557                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 558                                                 ipvalid = false;
 559                                 }
 560 #else
 561                                 in_addr n;
 562                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 563                                         ipvalid = false;
 564 #endif
 565
 566                                 if (!ipvalid)
 567                                 {
 568                                         try
 569                                         {
 570                                                 bool cached;
 571                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 572                                                 ServerInstance->AddResolver(sr, cached);
 573                                         }
 574                                         catch (...)
 575                                         {
 576                                         }
 577                                 }
 578
 579                                 LinkBlocks.push_back(L);
 580                         }
 581                         else
 582                         {
 583                                 if (L.IPAddr.empty())
 584                                 {
 585                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', IP address not defined!",L.Name.c_str());
 586                                 }
 587                                 else if (L.RecvPass.empty())
 588                                 {
 589                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', recvpass not defined!",L.Name.c_str());
 590                                 }
 591                                 else if (L.SendPass.empty())
 592                                 {
 593                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', sendpass not defined!",L.Name.c_str());
 594                                 }
 595                                 else if (L.Name.empty())
 596                                 {
 597                                         ServerInstance->Log(DEFAULT,"Invalid configuration, link tag without a name!");
 598                                 }
 599                                 else if (!L.Port)
 600                                 {
 601                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', no port specified!",L.Name.c_str());
 602                                 }
 603                         }
 604                 }
 605                 else
 606                 {
 607                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', link tag has the same server name as the local server!",L.Name.c_str());
 608                 }
 609         }
 610         DELETE(Conf);
 611 }
 612
 613 void SpanningTreeUtilities::DoFailOver(Link* x)
 614 {
 615         if (x->FailOver.length())
 616         {
 617                 if (x->FailOver == x->Name)
 618                 {
 619                         ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Some muppet configured the failover for server \002%s\002 to point at itself. Not following it!", x->Name.c_str());
 620                         return;
 621                 }
 622                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 623                 if (TryThisOne)
 624                 {
 625                         ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 626                         Creator->ConnectServer(TryThisOne);
 627                 }
 628                 else
 629                 {
 630                         ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 631                 }
 632         }
 633 }
 634
 635 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 636 {
 637         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 638         {
 639                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
 640                 {
 641                         return &(*x);
 642                 }
 643         }
 644         return NULL;
 645 }
 646