src/modules/m_spanningtree/utils.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 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 "commands/cmd_whois.h"
  16 #include "commands/cmd_stats.h"
  17 #include "socket.h"
  18 #include "wildcard.h"
  19 #include "xline.h"
  20 #include "transport.h"
  21 #include "socketengine.h"
  22
  23 #include "m_spanningtree/main.h"
  24 #include "m_spanningtree/utils.h"
  25 #include "m_spanningtree/treeserver.h"
  26 #include "m_spanningtree/link.h"
  27 #include "m_spanningtree/treesocket.h"
  28 #include "m_spanningtree/resolvers.h"
  29
  30 /* $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 */
  31
  32 /** Yay for fast searches!
  33  * This is hundreds of times faster than recursion
  34  * or even scanning a linked list, especially when
  35  * there are more than a few servers to deal with.
  36  * (read as: lots).
  37  */
  38 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  39 {
  40         if (this->ServerInstance->IsSID(ServerName))
  41                 return this->FindServerID(ServerName);
  42
  43         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  44         if (iter != serverlist.end())
  45         {
  46                 return iter->second;
  47         }
  48         else
  49         {
  50                 return NULL;
  51         }
  52 }
  53
  54 /** Returns the locally connected server we must route a
  55  * message through to reach server 'ServerName'. This
  56  * only applies to one-to-one and not one-to-many routing.
  57  * See the comments for the constructor of TreeServer
  58  * for more details.
  59  */
  60 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
  61 {
  62         if (ServerName.c_str() == TreeRoot->GetName() || ServerName == ServerInstance->Config->GetSID())
  63                 return NULL;
  64         TreeServer* Found = FindServer(ServerName);
  65         if (Found)
  66         {
  67                 return Found->GetRoute();
  68         }
  69         else
  70         {
  71                 return NULL;
  72         }
  73 }
  74
  75 /** Find the first server matching a given glob mask.
  76  * Theres no find-using-glob method of hash_map [awwww :-(]
  77  * so instead, we iterate over the list using an iterator
  78  * and match each one until we get a hit. Yes its slow,
  79  * deal with it.
  80  */
  81 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
  82 {
  83         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
  84         {
  85                 if (match(i->first.c_str(),ServerName.c_str()))
  86                         return i->second;
  87         }
  88         return NULL;
  89 }
  90
  91 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
  92 {
  93         server_hash::iterator iter = sidlist.find(id);
  94         if (iter != sidlist.end())
  95                 return iter->second;
  96         else
  97                 return NULL;
  98 }
  99
 100 /* A convenient wrapper that returns true if a server exists */
 101 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 102 {
 103         return (FindServer(ServerName) != NULL);
 104 }
 105
 106 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 107 {
 108         Bindings.clear();
 109
 110         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"***** Using SID for hash: %s *****", ServerInstance->Config->GetSID().c_str());
 111
 112         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 113
 114         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 115
 116         /* Did we find any modules? */
 117         if (ml)
 118         {
 119                 /* Yes, enumerate them all to find out the hook name */
 120                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 121                 {
 122                         /* Make a request to it for its name, its implementing
 123                          * BufferedSocketHook so we know its safe to do this
 124                          */
 125                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 126                         /* Build a map of them */
 127                         hooks[name.c_str()] = *m;
 128                         hooknames.push_back(name);
 129                 }
 130         }
 131
 132         this->ReadConfiguration(true);
 133 }
 134
 135 SpanningTreeUtilities::~SpanningTreeUtilities()
 136 {
 137         for (unsigned int i = 0; i < Bindings.size(); i++)
 138         {
 139                 ServerInstance->SE->DelFd(Bindings[i]);
 140                 Bindings[i]->Close();
 141         }
 142         while (TreeRoot->ChildCount())
 143         {
 144                 TreeServer* child_server = TreeRoot->GetChild(0);
 145                 if (child_server)
 146                 {
 147                         TreeSocket* sock = child_server->GetSocket();
 148                         ServerInstance->SE->DelFd(sock);
 149                         sock->Close();
 150                 }
 151         }
 152         delete TreeRoot;
 153         ServerInstance->BufferedSocketCull();
 154 }
 155
 156 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 157 {
 158         if (list.find(server) == list.end())
 159                 list[server] = server;
 160 }
 161
 162 /* returns a list of DIRECT servernames for a specific channel */
 163 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 164 {
 165         CUList *ulist;
 166         switch (status)
 167         {
 168                 case '@':
 169                         ulist = c->GetOppedUsers();
 170                 break;
 171                 case '%':
 172                         ulist = c->GetHalfoppedUsers();
 173                 break;
 174                 case '+':
 175                         ulist = c->GetVoicedUsers();
 176                 break;
 177                 default:
 178                         ulist = c->GetUsers();
 179                 break;
 180         }
 181         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 182         {
 183                 if ((i->first->GetFd() < 0) && (exempt_list.find(i->first) == exempt_list.end()))
 184                 {
 185                         TreeServer* best = this->BestRouteTo(i->first->server);
 186                         if (best)
 187                                 AddThisServer(best,list);
 188                 }
 189         }
 190         return;
 191 }
 192
 193 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 194 {
 195         char pfx = 0;
 196         TreeServer* omitroute = this->BestRouteTo(omit);
 197         if ((command == "NOTICE") || (command == "PRIVMSG"))
 198         {
 199                 if (params.size() >= 2)
 200                 {
 201                         /* Prefixes */
 202                         if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
 203                         {
 204                                 pfx = params[0][0];
 205                                 params[0] = params[0].substr(1, params[0].length()-1);
 206                         }
 207                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 208                         {
 209                                 // special routing for private messages/notices
 210                                 User* d = ServerInstance->FindNick(params[0]);
 211                                 if (d)
 212                                 {
 213                                         std::deque<std::string> par;
 214                                         par.push_back(params[0]);
 215                                         par.push_back(":"+params[1]);
 216                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 217                                         return true;
 218                                 }
 219                         }
 220                         else if (*(params[0].c_str()) == '$')
 221                         {
 222                                 std::deque<std::string> par;
 223                                 par.push_back(params[0]);
 224                                 par.push_back(":"+params[1]);
 225                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 226                                 return true;
 227                         }
 228                         else
 229                         {
 230                                 Channel* c = ServerInstance->FindChan(params[0]);
 231                                 User* u = ServerInstance->FindNick(prefix);
 232                                 if (c)
 233                                 {
 234                                         CUList elist;
 235                                         TreeServerList list;
 236                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 237                                         GetListOfServersForChannel(c,list,pfx,elist);
 238
 239                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 240                                         {
 241                                                 TreeSocket* Sock = i->second->GetSocket();
 242                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 243                                                 {
 244                                                         Sock->WriteLine(data);
 245                                                 }
 246                                         }
 247                                         return true;
 248                                 }
 249                         }
 250                 }
 251         }
 252         unsigned int items =this->TreeRoot->ChildCount();
 253         for (unsigned int x = 0; x < items; x++)
 254         {
 255                 TreeServer* Route = this->TreeRoot->GetChild(x);
 256                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 257                 {
 258                         TreeSocket* Sock = Route->GetSocket();
 259                         if (Sock)
 260                                 Sock->WriteLine(data);
 261                 }
 262         }
 263         return true;
 264 }
 265
 266 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 267 {
 268         TreeServer* omitroute = this->BestRouteTo(omit);
 269         std::string FullLine = ":" + prefix + " " + command;
 270         unsigned int words = params.size();
 271         for (unsigned int x = 0; x < words; x++)
 272         {
 273                 FullLine = FullLine + " " + params[x];
 274         }
 275         unsigned int items = this->TreeRoot->ChildCount();
 276         for (unsigned int x = 0; x < items; x++)
 277         {
 278                 TreeServer* Route = this->TreeRoot->GetChild(x);
 279                 // Send the line IF:
 280                 // The route has a socket (its a direct connection)
 281                 // The route isnt the one to be omitted
 282                 // The route isnt the path to the one to be omitted
 283                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 284                 {
 285                         TreeSocket* Sock = Route->GetSocket();
 286                         if (Sock)
 287                                 Sock->WriteLine(FullLine);
 288                 }
 289         }
 290         return true;
 291 }
 292
 293 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 294 {
 295         std::string FullLine = ":" + prefix + " " + command;
 296         unsigned int words = params.size();
 297         for (unsigned int x = 0; x < words; x++)
 298         {
 299                 FullLine = FullLine + " " + params[x];
 300         }
 301         unsigned int items = this->TreeRoot->ChildCount();
 302         for (unsigned int x = 0; x < items; x++)
 303         {
 304                 TreeServer* Route = this->TreeRoot->GetChild(x);
 305                 if (Route && Route->GetSocket())
 306                 {
 307                         TreeSocket* Sock = Route->GetSocket();
 308                         if (Sock)
 309                                 Sock->WriteLine(FullLine);
 310                 }
 311         }
 312         return true;
 313 }
 314
 315 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 316 {
 317         std::string spfx = prefix;
 318         std::string scmd = command;
 319         return this->DoOneToMany(spfx, scmd, params);
 320 }
 321
 322 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 323 {
 324         std::string spfx = prefix;
 325         std::string scmd = command;
 326         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 327 }
 328
 329 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 330 {
 331         TreeServer* Route = this->BestRouteTo(target);
 332         if (Route)
 333         {
 334                 std::string FullLine = ":" + prefix + " " + command;
 335                 unsigned int words = params.size();
 336                 for (unsigned int x = 0; x < words; x++)
 337                 {
 338                         FullLine = FullLine + " " + params[x];
 339                 }
 340                 if (Route && Route->GetSocket())
 341                 {
 342                         TreeSocket* Sock = Route->GetSocket();
 343                         if (Sock)
 344                                 Sock->WriteLine(FullLine);
 345                 }
 346                 return true;
 347         }
 348         else
 349         {
 350                 return false;
 351         }
 352 }
 353
 354 void SpanningTreeUtilities::RefreshIPCache()
 355 {
 356         ValidIPs.clear();
 357         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 358         {
 359                 if ((!L->IPAddr.empty()) && (!L->RecvPass.empty()) && (!L->SendPass.empty()) && (!L->Name.empty()) && (L->Port))
 360                 {
 361                         ValidIPs.push_back(L->IPAddr);
 362
 363                         if (L->AllowMask.length())
 364                                 ValidIPs.push_back(L->AllowMask);
 365
 366                         /* Needs resolving */
 367                         bool ipvalid = true;
 368                         QueryType start_type = DNS_QUERY_A;
 369 #ifdef IPV6
 370                         start_type = DNS_QUERY_AAAA;
 371                         if (strchr(L->IPAddr.c_str(),':'))
 372                         {
 373                                 in6_addr n;
 374                                 if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 375                                         ipvalid = false;
 376                         }
 377                         else
 378 #endif
 379                         {
 380                                 in_addr n;
 381                                 if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 382                                         ipvalid = false;
 383                         }
 384                         if (!ipvalid)
 385                         {
 386                                 try
 387                                 {
 388                                         bool cached;
 389                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 390                                         ServerInstance->AddResolver(sr, cached);
 391                                 }
 392                                 catch (...)
 393                                 {
 394                                 }
 395                         }
 396                 }
 397         }
 398 }
 399
 400 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 401 {
 402         ConfigReader* Conf = new ConfigReader(ServerInstance);
 403         if (rebind)
 404         {
 405                 for (unsigned int i = 0; i < Bindings.size(); i++)
 406                 {
 407                         ServerInstance->SE->DelFd(Bindings[i]);
 408                         Bindings[i]->Close();
 409                 }
 410                 ServerInstance->BufferedSocketCull();
 411                 Bindings.clear();
 412
 413                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 414                 {
 415                         std::string Type = Conf->ReadValue("bind","type",j);
 416                         std::string IP = Conf->ReadValue("bind","address",j);
 417                         std::string Port = Conf->ReadValue("bind","port",j);
 418                         std::string transport = Conf->ReadValue("bind","transport",j);
 419                         if (Type == "servers")
 420                         {
 421                                 irc::portparser portrange(Port, false);
 422                                 int portno = -1;
 423
 424                                 if (IP == "*")
 425                                         IP.clear();
 426
 427                                 while ((portno = portrange.GetToken()))
 428                                 {
 429                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 430                                         {
 431                                                 throw CoreException("Can't find transport type '"+transport+"' for port "+IP+":"+Port+" - maybe you forgot to load it BEFORE m_spanningtree in your config file?");
 432                                                 break;
 433                                         }
 434
 435                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 436                                         if (listener->GetState() == I_LISTENING)
 437                                         {
 438                                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 439                                                 Bindings.push_back(listener);
 440                                         }
 441                                         else
 442                                         {
 443                                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 444                                                 listener->Close();
 445                                         }
 446                                 }
 447                         }
 448                 }
 449         }
 450         FlatLinks = Conf->ReadFlag("options","flatlinks",0);
 451         HideULines = Conf->ReadFlag("options","hideulines",0);
 452         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 453         ChallengeResponse = !Conf->ReadFlag("options", "disablehmac", 0);
 454         quiet_bursts = Conf->ReadFlag("options", "quietbursts", 0);
 455         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 456         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 457
 458         if (PingFreq == 0)
 459                 PingFreq = 60;
 460
 461         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 462                 PingWarnTime = 0;
 463
 464         LinkBlocks.clear();
 465         ValidIPs.clear();
 466         for (int j = 0; j < Conf->Enumerate("link"); j++)
 467         {
 468                 Link L;
 469                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 470                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 471                 L.AllowMask = Allow;
 472                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 473                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 474                 L.Port = Conf->ReadInteger("link", "port", j, true);
 475                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 476                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 477                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 478                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 479                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 480                 L.Hook = Conf->ReadValue("link", "transport", j);
 481                 L.Bind = Conf->ReadValue("link", "bind", j);
 482                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 483
 484                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 485                 {
 486                         throw CoreException("Can't find transport type '"+L.Hook+"' for link '"+assign(L.Name)+"' - maybe you forgot to load it BEFORE m_spanningtree in your config file? Skipping <link> tag completely.");
 487                         continue;
 488
 489                 }
 490
 491                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 492                 /* Bugfix by brain, do not allow people to enter bad configurations */
 493                 if (L.Name != ServerInstance->Config->ServerName)
 494                 {
 495                         if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 496                         {
 497                                 if (L.Name.find('.') == std::string::npos)
 498                                         throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 499
 500                                 if (L.Name.length() > 64)
 501                                         throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 502
 503                                 ValidIPs.push_back(L.IPAddr);
 504
 505                                 if (Allow.length())
 506                                         ValidIPs.push_back(Allow);
 507
 508                                 /* Needs resolving */
 509                                 bool ipvalid = true;
 510                                 QueryType start_type = DNS_QUERY_A;
 511 #ifdef IPV6
 512                                 start_type = DNS_QUERY_AAAA;
 513                                 if (strchr(L.IPAddr.c_str(),':'))
 514                                 {
 515                                         in6_addr n;
 516                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 517                                                 ipvalid = false;
 518                                 }
 519                                 else
 520                                 {
 521                                         in_addr n;
 522                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 523                                                 ipvalid = false;
 524                                 }
 525 #else
 526                                 in_addr n;
 527                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 528                                         ipvalid = false;
 529 #endif
 530
 531                                 if (!ipvalid)
 532                                 {
 533                                         try
 534                                         {
 535                                                 bool cached;
 536                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 537                                                 ServerInstance->AddResolver(sr, cached);
 538                                         }
 539                                         catch (...)
 540                                         {
 541                                         }
 542                                 }
 543
 544                                 LinkBlocks.push_back(L);
 545                         }
 546                         else
 547                         {
 548                                 if (L.IPAddr.empty())
 549                                 {
 550                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', IP address not defined!");
 551                                 }
 552                                 else if (L.RecvPass.empty())
 553                                 {
 554                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 555                                 }
 556                                 else if (L.SendPass.empty())
 557                                 {
 558                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 559                                 }
 560                                 else if (L.Name.empty())
 561                                 {
 562                                         throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 563                                 }
 564                                 else if (!L.Port)
 565                                 {
 566                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', no port specified!");
 567                                 }
 568                         }
 569                 }
 570                 else
 571                 {
 572                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', link tag has the same server name as the local server!");
 573                 }
 574         }
 575         delete Conf;
 576 }
 577
 578 void SpanningTreeUtilities::DoFailOver(Link* x)
 579 {
 580         if (x->FailOver.length())
 581         {
 582                 if (x->FailOver == x->Name)
 583                 {
 584                         Creator->RemoteMessage(NULL,"FAILOVER: Some muppet configured the failover for server \002%s\002 to point at itself. Not following it!", x->Name.c_str());
 585                         return;
 586                 }
 587                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 588                 if (TryThisOne)
 589                 {
 590                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 591                         if (CheckDupe)
 592                         {
 593                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 594                         }
 595                         else
 596                         {
 597                                 Creator->RemoteMessage(NULL,"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 598                                 Creator->ConnectServer(TryThisOne);
 599                         }
 600                 }
 601                 else
 602                 {
 603                         Creator->RemoteMessage(NULL,"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 604                 }
 605         }
 606 }
 607
 608 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 609 {
 610         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 611         {
 612                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
 613                 {
 614                         return &(*x);
 615                 }
 616         }
 617         return NULL;
 618 }