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 = c->GetUsers();
 166
 167         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 168         {
 169                 if (IS_LOCAL(i->first))
 170                         continue;
 171
 172                 if (status && !strchr(c->GetAllPrefixChars(i->first), status))
 173                         continue;
 174
 175                 if (exempt_list.find(i->first) == exempt_list.end())
 176                 {
 177                         TreeServer* best = this->BestRouteTo(i->first->server);
 178                         if (best)
 179                                 AddThisServer(best,list);
 180                 }
 181         }
 182         return;
 183 }
 184
 185 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 186 {
 187         char pfx = 0;
 188         TreeServer* omitroute = this->BestRouteTo(omit);
 189         if ((command == "NOTICE") || (command == "PRIVMSG"))
 190         {
 191                 if (params.size() >= 2)
 192                 {
 193                         /* Prefixes */
 194                         if (ServerInstance->Modes->FindPrefix(params[0][0]))
 195                         {
 196                                 pfx = params[0][0];
 197                                 params[0] = params[0].substr(1, params[0].length()-1);
 198                         }
 199                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 200                         {
 201                                 // special routing for private messages/notices
 202                                 User* d = ServerInstance->FindNick(params[0]);
 203                                 if (d)
 204                                 {
 205                                         std::deque<std::string> par;
 206                                         par.push_back(params[0]);
 207                                         par.push_back(":"+params[1]);
 208                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 209                                         return true;
 210                                 }
 211                         }
 212                         else if (*(params[0].c_str()) == '$')
 213                         {
 214                                 std::deque<std::string> par;
 215                                 par.push_back(params[0]);
 216                                 par.push_back(":"+params[1]);
 217                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 218                                 return true;
 219                         }
 220                         else
 221                         {
 222                                 Channel* c = ServerInstance->FindChan(params[0]);
 223                                 User* u = ServerInstance->FindNick(prefix);
 224                                 if (c)
 225                                 {
 226                                         CUList elist;
 227                                         TreeServerList list;
 228                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 229                                         GetListOfServersForChannel(c,list,pfx,elist);
 230
 231                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 232                                         {
 233                                                 TreeSocket* Sock = i->second->GetSocket();
 234                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 235                                                 {
 236                                                         Sock->WriteLine(data);
 237                                                 }
 238                                         }
 239                                         return true;
 240                                 }
 241                         }
 242                 }
 243         }
 244         unsigned int items =this->TreeRoot->ChildCount();
 245         for (unsigned int x = 0; x < items; x++)
 246         {
 247                 TreeServer* Route = this->TreeRoot->GetChild(x);
 248                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 249                 {
 250                         TreeSocket* Sock = Route->GetSocket();
 251                         if (Sock)
 252                                 Sock->WriteLine(data);
 253                 }
 254         }
 255         return true;
 256 }
 257
 258 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 259 {
 260         TreeServer* omitroute = this->BestRouteTo(omit);
 261         std::string FullLine = ":" + prefix + " " + command;
 262         unsigned int words = params.size();
 263         for (unsigned int x = 0; x < words; x++)
 264         {
 265                 FullLine = FullLine + " " + params[x];
 266         }
 267         unsigned int items = this->TreeRoot->ChildCount();
 268         for (unsigned int x = 0; x < items; x++)
 269         {
 270                 TreeServer* Route = this->TreeRoot->GetChild(x);
 271                 // Send the line IF:
 272                 // The route has a socket (its a direct connection)
 273                 // The route isnt the one to be omitted
 274                 // The route isnt the path to the one to be omitted
 275                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 276                 {
 277                         TreeSocket* Sock = Route->GetSocket();
 278                         if (Sock)
 279                                 Sock->WriteLine(FullLine);
 280                 }
 281         }
 282         return true;
 283 }
 284
 285 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 286 {
 287         std::string FullLine = ":" + prefix + " " + command;
 288         unsigned int words = params.size();
 289         for (unsigned int x = 0; x < words; x++)
 290         {
 291                 FullLine = FullLine + " " + params[x];
 292         }
 293         unsigned int items = this->TreeRoot->ChildCount();
 294         for (unsigned int x = 0; x < items; x++)
 295         {
 296                 TreeServer* Route = this->TreeRoot->GetChild(x);
 297                 if (Route && Route->GetSocket())
 298                 {
 299                         TreeSocket* Sock = Route->GetSocket();
 300                         if (Sock)
 301                                 Sock->WriteLine(FullLine);
 302                 }
 303         }
 304         return true;
 305 }
 306
 307 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 308 {
 309         std::string spfx = prefix;
 310         std::string scmd = command;
 311         return this->DoOneToMany(spfx, scmd, params);
 312 }
 313
 314 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 315 {
 316         std::string spfx = prefix;
 317         std::string scmd = command;
 318         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 319 }
 320
 321 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 322 {
 323         TreeServer* Route = this->BestRouteTo(target);
 324         if (Route)
 325         {
 326                 std::string FullLine = ":" + prefix + " " + command;
 327                 unsigned int words = params.size();
 328                 for (unsigned int x = 0; x < words; x++)
 329                 {
 330                         FullLine = FullLine + " " + params[x];
 331                 }
 332                 if (Route && Route->GetSocket())
 333                 {
 334                         TreeSocket* Sock = Route->GetSocket();
 335                         if (Sock)
 336                                 Sock->WriteLine(FullLine);
 337                 }
 338                 return true;
 339         }
 340         else
 341         {
 342                 return false;
 343         }
 344 }
 345
 346 void SpanningTreeUtilities::RefreshIPCache()
 347 {
 348         ValidIPs.clear();
 349         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 350         {
 351                 if ((!L->IPAddr.empty()) && (!L->RecvPass.empty()) && (!L->SendPass.empty()) && (!L->Name.empty()) && (L->Port))
 352                 {
 353                         ValidIPs.push_back(L->IPAddr);
 354
 355                         if (L->AllowMask.length())
 356                                 ValidIPs.push_back(L->AllowMask);
 357
 358                         /* Needs resolving */
 359                         bool ipvalid = true;
 360                         QueryType start_type = DNS_QUERY_A;
 361 #ifdef IPV6
 362                         start_type = DNS_QUERY_AAAA;
 363                         if (strchr(L->IPAddr.c_str(),':'))
 364                         {
 365                                 in6_addr n;
 366                                 if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 367                                         ipvalid = false;
 368                         }
 369                         else
 370 #endif
 371                         {
 372                                 in_addr n;
 373                                 if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 374                                         ipvalid = false;
 375                         }
 376                         if (!ipvalid)
 377                         {
 378                                 try
 379                                 {
 380                                         bool cached;
 381                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 382                                         ServerInstance->AddResolver(sr, cached);
 383                                 }
 384                                 catch (...)
 385                                 {
 386                                 }
 387                         }
 388                 }
 389         }
 390 }
 391
 392 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 393 {
 394         ConfigReader* Conf = new ConfigReader(ServerInstance);
 395         if (rebind)
 396         {
 397                 for (unsigned int i = 0; i < Bindings.size(); i++)
 398                 {
 399                         ServerInstance->SE->DelFd(Bindings[i]);
 400                         Bindings[i]->Close();
 401                 }
 402                 ServerInstance->BufferedSocketCull();
 403                 Bindings.clear();
 404
 405                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 406                 {
 407                         std::string Type = Conf->ReadValue("bind","type",j);
 408                         std::string IP = Conf->ReadValue("bind","address",j);
 409                         std::string Port = Conf->ReadValue("bind","port",j);
 410                         std::string transport = Conf->ReadValue("bind","transport",j);
 411                         if (Type == "servers")
 412                         {
 413                                 irc::portparser portrange(Port, false);
 414                                 int portno = -1;
 415
 416                                 if (IP == "*")
 417                                         IP.clear();
 418
 419                                 while ((portno = portrange.GetToken()))
 420                                 {
 421                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 422                                         {
 423                                                 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?");
 424                                                 break;
 425                                         }
 426
 427                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 428                                         if (listener->GetState() == I_LISTENING)
 429                                         {
 430                                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 431                                                 Bindings.push_back(listener);
 432                                         }
 433                                         else
 434                                         {
 435                                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 436                                                 listener->Close();
 437                                         }
 438                                 }
 439                         }
 440                 }
 441         }
 442         FlatLinks = Conf->ReadFlag("security","flatlinks",0);
 443         HideULines = Conf->ReadFlag("security","hideulines",0);
 444         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 445         ChallengeResponse = !Conf->ReadFlag("security", "disablehmac", 0);
 446         quiet_bursts = Conf->ReadFlag("performance", "quietbursts", 0);
 447         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 448         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 449
 450         if (PingFreq == 0)
 451                 PingFreq = 60;
 452
 453         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 454                 PingWarnTime = 0;
 455
 456         LinkBlocks.clear();
 457         ValidIPs.clear();
 458         for (int j = 0; j < Conf->Enumerate("link"); j++)
 459         {
 460                 Link L;
 461                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 462                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 463                 L.AllowMask = Allow;
 464                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 465                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 466                 L.Port = Conf->ReadInteger("link", "port", j, true);
 467                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 468                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 469                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 470                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 471                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 472                 L.Hook = Conf->ReadValue("link", "transport", j);
 473                 L.Bind = Conf->ReadValue("link", "bind", j);
 474                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 475
 476                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 477                 {
 478                         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.");
 479                         continue;
 480
 481                 }
 482
 483                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 484                 /* Bugfix by brain, do not allow people to enter bad configurations */
 485                 if (L.Name != ServerInstance->Config->ServerName)
 486                 {
 487                         if (L.Name.find('.') == std::string::npos)
 488                                 throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 489
 490                         if (L.Name.length() > 64)
 491                                 throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 492
 493                         if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 494                         {
 495                                 if (Allow.length())
 496                                         ValidIPs.push_back(Allow);
 497
 498                                 ValidIPs.push_back(L.IPAddr);
 499
 500                                 /* Needs resolving */
 501                                 bool ipvalid = true;
 502                                 QueryType start_type = DNS_QUERY_A;
 503 #ifdef IPV6
 504                                 start_type = DNS_QUERY_AAAA;
 505                                 if (strchr(L.IPAddr.c_str(),':'))
 506                                 {
 507                                         in6_addr n;
 508                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 509                                                 ipvalid = false;
 510                                 }
 511                                 else
 512                                 {
 513                                         in_addr n;
 514                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 515                                                 ipvalid = false;
 516                                 }
 517 #else
 518                                 in_addr n;
 519                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 520                                         ipvalid = false;
 521 #endif
 522
 523                                 if (!ipvalid)
 524                                 {
 525                                         try
 526                                         {
 527                                                 bool cached;
 528                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 529                                                 ServerInstance->AddResolver(sr, cached);
 530                                         }
 531                                         catch (...)
 532                                         {
 533                                         }
 534                                 }
 535                         }
 536                         else
 537                         {
 538                                 if (L.IPAddr.empty())
 539                                 {
 540                                         L.IPAddr = "*";
 541                                         ValidIPs.push_back("*");
 542                                         ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Configuration warning: Link block " + assign(L.Name) + " has no IP defined! This will allow any IP to connect as this server, and MAY not be what you want.");
 543                                 }
 544
 545                                 if (L.RecvPass.empty())
 546                                 {
 547                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 548                                 }
 549
 550                                 if (L.SendPass.empty())
 551                                 {
 552                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 553                                 }
 554
 555                                 if (L.Name.empty())
 556                                 {
 557                                         throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 558                                 }
 559
 560                                 if (!L.Port)
 561                                 {
 562                                         ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Configuration warning: Link block " + assign(L.Name) + " has no port defined, you will not be able to /connect it.");
 563                                 }
 564                         }
 565
 566
 567                         LinkBlocks.push_back(L);
 568                 }
 569                 else
 570                 {
 571                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', link tag has the same server name as the local server!");
 572                 }
 573         }
 574         delete Conf;
 575 }
 576
 577 void SpanningTreeUtilities::DoFailOver(Link* x)
 578 {
 579         if (x->FailOver.length())
 580         {
 581                 if (x->FailOver == x->Name)
 582                 {
 583                         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());
 584                         return;
 585                 }
 586                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 587                 if (TryThisOne)
 588                 {
 589                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 590                         if (CheckDupe)
 591                         {
 592                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 593                         }
 594                         else
 595                         {
 596                                 Creator->RemoteMessage(NULL,"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 597                                 Creator->ConnectServer(TryThisOne);
 598                         }
 599                 }
 600                 else
 601                 {
 602                         Creator->RemoteMessage(NULL,"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 603                 }
 604         }
 605 }
 606
 607 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 608 {
 609         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 610         {
 611                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
 612                 {
 613                         return &(*x);
 614                 }
 615         }
 616         return NULL;
 617 }