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