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 "xline.h"
  19 #include "transport.h"
  20 #include "socketengine.h"
  21
  22 #include "m_spanningtree/main.h"
  23 #include "m_spanningtree/utils.h"
  24 #include "m_spanningtree/treeserver.h"
  25 #include "m_spanningtree/link.h"
  26 #include "m_spanningtree/treesocket.h"
  27 #include "m_spanningtree/resolvers.h"
  28
  29 /* $ModDep: m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h */
  30
  31 /* Create server sockets off a listener. */
  32 void ServerSocketListener::OnAcceptReady(const std::string &ipconnectedto, int newsock, const std::string &incomingip)
  33 {
  34         bool found = false;
  35         char *ip = (char *)incomingip.c_str(); // XXX ugly cast
  36
  37         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
  38         if (!found)
  39         {
  40                 for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  41                 {
  42                         if (*i == "*" || irc::sockets::MatchCIDR(ip, *i))
  43                         {
  44                                 found = true;
  45                                 break;
  46                         }
  47                 }
  48
  49                 if (!found)
  50                 {
  51                         this->ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", ip);
  52                         ServerInstance->SE->Close(newsock);
  53                         return;
  54                 }
  55         }
  56
  57         if (this->GetIOHook())
  58         {
  59                 this->GetIOHook()->OnRawSocketAccept(newsock, incomingip.c_str(), this->bind_port);
  60         }
  61
  62         /* we don't need a pointer to this, creating it stores it in the necessary places */
  63         new TreeSocket(this->Utils, this->ServerInstance, newsock, ip, this->GetIOHook());
  64         return;
  65 }
  66
  67 /** Yay for fast searches!
  68  * This is hundreds of times faster than recursion
  69  * or even scanning a linked list, especially when
  70  * there are more than a few servers to deal with.
  71  * (read as: lots).
  72  */
  73 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  74 {
  75         if (this->ServerInstance->IsSID(ServerName))
  76                 return this->FindServerID(ServerName);
  77
  78         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  79         if (iter != serverlist.end())
  80         {
  81                 return iter->second;
  82         }
  83         else
  84         {
  85                 return NULL;
  86         }
  87 }
  88
  89 /** Returns the locally connected server we must route a
  90  * message through to reach server 'ServerName'. This
  91  * only applies to one-to-one and not one-to-many routing.
  92  * See the comments for the constructor of TreeServer
  93  * for more details.
  94  */
  95 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
  96 {
  97         if (ServerName.c_str() == TreeRoot->GetName() || ServerName == ServerInstance->Config->GetSID())
  98                 return NULL;
  99         TreeServer* Found = FindServer(ServerName);
 100         if (Found)
 101         {
 102                 return Found->GetRoute();
 103         }
 104         else
 105         {
 106                 // Cheat a bit. This allows for (better) working versions of routing commands with nick based prefixes, without hassle
 107                 User *u = ServerInstance->FindNick(ServerName);
 108                 if (u)
 109                 {
 110                         Found = FindServer(u->server);
 111                         if (Found)
 112                                 return Found->GetRoute();
 113                 }
 114
 115                 return NULL;
 116         }
 117 }
 118
 119 /** Find the first server matching a given glob mask.
 120  * Theres no find-using-glob method of hash_map [awwww :-(]
 121  * so instead, we iterate over the list using an iterator
 122  * and match each one until we get a hit. Yes its slow,
 123  * deal with it.
 124  */
 125 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 126 {
 127         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 128         {
 129                 if (InspIRCd::Match(i->first,ServerName))
 130                         return i->second;
 131         }
 132         return NULL;
 133 }
 134
 135 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 136 {
 137         server_hash::iterator iter = sidlist.find(id);
 138         if (iter != sidlist.end())
 139                 return iter->second;
 140         else
 141                 return NULL;
 142 }
 143
 144 /* A convenient wrapper that returns true if a server exists */
 145 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 146 {
 147         return (FindServer(ServerName) != NULL);
 148 }
 149
 150 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 151 {
 152         Bindings.clear();
 153
 154         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"***** Using SID for hash: %s *****", ServerInstance->Config->GetSID().c_str());
 155
 156         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 157
 158         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 159
 160         /* Did we find any modules? */
 161         if (ml)
 162         {
 163                 /* Yes, enumerate them all to find out the hook name */
 164                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 165                 {
 166                         /* Make a request to it for its name, its implementing
 167                          * BufferedSocketHook so we know its safe to do this
 168                          */
 169                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 170                         /* Build a map of them */
 171                         hooks[name.c_str()] = *m;
 172                         hooknames.push_back(name);
 173                 }
 174         }
 175
 176         this->ReadConfiguration(true);
 177 }
 178
 179 SpanningTreeUtilities::~SpanningTreeUtilities()
 180 {
 181         for (unsigned int i = 0; i < Bindings.size(); i++)
 182         {
 183                 delete Bindings[i];
 184         }
 185
 186         while (TreeRoot->ChildCount())
 187         {
 188                 TreeServer* child_server = TreeRoot->GetChild(0);
 189                 if (child_server)
 190                 {
 191                         TreeSocket* sock = child_server->GetSocket();
 192                         ServerInstance->SE->DelFd(sock);
 193                         sock->Close();
 194                 }
 195         }
 196         delete TreeRoot;
 197         ServerInstance->BufferedSocketCull();
 198 }
 199
 200 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 201 {
 202         if (list.find(server) == list.end())
 203                 list[server] = server;
 204 }
 205
 206 /* returns a list of DIRECT servernames for a specific channel */
 207 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 208 {
 209         CUList *ulist = c->GetUsers();
 210
 211         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 212         {
 213                 if (IS_LOCAL(i->first))
 214                         continue;
 215
 216                 if (status && !strchr(c->GetAllPrefixChars(i->first), status))
 217                         continue;
 218
 219                 if (exempt_list.find(i->first) == exempt_list.end())
 220                 {
 221                         TreeServer* best = this->BestRouteTo(i->first->server);
 222                         if (best)
 223                                 AddThisServer(best,list);
 224                 }
 225         }
 226         return;
 227 }
 228
 229 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 230 {
 231         char pfx = 0;
 232         TreeServer* omitroute = this->BestRouteTo(omit);
 233         if ((command == "NOTICE") || (command == "PRIVMSG"))
 234         {
 235                 if (params.size() >= 2)
 236                 {
 237                         /* Prefixes */
 238                         if (ServerInstance->Modes->FindPrefix(params[0][0]))
 239                         {
 240                                 pfx = params[0][0];
 241                                 params[0] = params[0].substr(1, params[0].length()-1);
 242                         }
 243                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 244                         {
 245                                 // special routing for private messages/notices
 246                                 User* d = ServerInstance->FindNick(params[0]);
 247                                 if (d)
 248                                 {
 249                                         std::deque<std::string> par;
 250                                         par.push_back(params[0]);
 251                                         par.push_back(":"+params[1]);
 252                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 253                                         return true;
 254                                 }
 255                         }
 256                         else if (*(params[0].c_str()) == '$')
 257                         {
 258                                 std::deque<std::string> par;
 259                                 par.push_back(params[0]);
 260                                 par.push_back(":"+params[1]);
 261                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 262                                 return true;
 263                         }
 264                         else
 265                         {
 266                                 Channel* c = ServerInstance->FindChan(params[0]);
 267                                 User* u = ServerInstance->FindNick(prefix);
 268                                 if (c)
 269                                 {
 270                                         CUList elist;
 271                                         TreeServerList list;
 272                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 273                                         GetListOfServersForChannel(c,list,pfx,elist);
 274
 275                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 276                                         {
 277                                                 TreeSocket* Sock = i->second->GetSocket();
 278                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 279                                                 {
 280                                                         Sock->WriteLine(data);
 281                                                 }
 282                                         }
 283                                         return true;
 284                                 }
 285                         }
 286                 }
 287         }
 288         unsigned int items =this->TreeRoot->ChildCount();
 289         for (unsigned int x = 0; x < items; x++)
 290         {
 291                 TreeServer* Route = this->TreeRoot->GetChild(x);
 292                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 293                 {
 294                         TreeSocket* Sock = Route->GetSocket();
 295                         if (Sock)
 296                                 Sock->WriteLine(data);
 297                 }
 298         }
 299         return true;
 300 }
 301
 302 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 303 {
 304         TreeServer* omitroute = this->BestRouteTo(omit);
 305         std::string FullLine = ":" + prefix + " " + command;
 306         unsigned int words = params.size();
 307         for (unsigned int x = 0; x < words; x++)
 308         {
 309                 FullLine = FullLine + " " + params[x];
 310         }
 311         unsigned int items = this->TreeRoot->ChildCount();
 312         for (unsigned int x = 0; x < items; x++)
 313         {
 314                 TreeServer* Route = this->TreeRoot->GetChild(x);
 315                 // Send the line IF:
 316                 // The route has a socket (its a direct connection)
 317                 // The route isnt the one to be omitted
 318                 // The route isnt the path to the one to be omitted
 319                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 320                 {
 321                         TreeSocket* Sock = Route->GetSocket();
 322                         if (Sock)
 323                                 Sock->WriteLine(FullLine);
 324                 }
 325         }
 326         return true;
 327 }
 328
 329 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 330 {
 331         std::string FullLine = ":" + prefix + " " + command;
 332         unsigned int words = params.size();
 333         for (unsigned int x = 0; x < words; x++)
 334         {
 335                 FullLine = FullLine + " " + params[x];
 336         }
 337         unsigned int items = this->TreeRoot->ChildCount();
 338         for (unsigned int x = 0; x < items; x++)
 339         {
 340                 TreeServer* Route = this->TreeRoot->GetChild(x);
 341                 if (Route && Route->GetSocket())
 342                 {
 343                         TreeSocket* Sock = Route->GetSocket();
 344                         if (Sock)
 345                                 Sock->WriteLine(FullLine);
 346                 }
 347         }
 348         return true;
 349 }
 350
 351 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 352 {
 353         std::string spfx = prefix;
 354         std::string scmd = command;
 355         return this->DoOneToMany(spfx, scmd, params);
 356 }
 357
 358 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 359 {
 360         std::string spfx = prefix;
 361         std::string scmd = command;
 362         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 363 }
 364
 365 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 366 {
 367         TreeServer* Route = this->BestRouteTo(target);
 368         if (Route)
 369         {
 370                 std::string FullLine = ":" + prefix + " " + command;
 371                 unsigned int words = params.size();
 372                 for (unsigned int x = 0; x < words; x++)
 373                 {
 374                         FullLine = FullLine + " " + params[x];
 375                 }
 376                 if (Route && Route->GetSocket())
 377                 {
 378                         TreeSocket* Sock = Route->GetSocket();
 379                         if (Sock)
 380                                 Sock->WriteLine(FullLine);
 381                 }
 382                 return true;
 383         }
 384         else
 385         {
 386                 return false;
 387         }
 388 }
 389
 390 void SpanningTreeUtilities::RefreshIPCache()
 391 {
 392         ValidIPs.clear();
 393         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 394         {
 395                 if (L->IPAddr.empty() || L->RecvPass.empty() || L->SendPass.empty() || L->Name.empty() || !L->Port)
 396                 {
 397                         if (L->Name.empty())
 398                         {
 399                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a malformed link block (all link blocks require a name!)");
 400                         }
 401                         else
 402                         {
 403                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a link block missing recvpass, sendpass, port or ipaddr.");
 404                         }
 405
 406                         /* Invalid link block */
 407                         continue;
 408                 }
 409
 410                 ValidIPs.push_back(L->IPAddr);
 411
 412                 if (L->AllowMask.length())
 413                         ValidIPs.push_back(L->AllowMask);
 414
 415                 /* Needs resolving */
 416                 bool ipvalid = true;
 417                 QueryType start_type = DNS_QUERY_A;
 418 #ifdef IPV6
 419                 start_type = DNS_QUERY_AAAA;
 420                 if (strchr(L->IPAddr.c_str(),':'))
 421                 {
 422                         in6_addr n;
 423                         if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 424                                 ipvalid = false;
 425                 }
 426                 else
 427 #endif
 428                 {
 429                         in_addr n;
 430                         if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 431                                 ipvalid = false;
 432                 }
 433
 434                 if (!ipvalid)
 435                 {
 436                         try
 437                         {
 438                                 bool cached;
 439                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 440                                 ServerInstance->AddResolver(sr, cached);
 441                         }
 442                         catch (...)
 443                         {
 444                         }
 445                 }
 446         }
 447 }
 448
 449 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 450 {
 451         ConfigReader* Conf = new ConfigReader(ServerInstance);
 452         if (rebind)
 453         {
 454                 for (unsigned int i = 0; i < Bindings.size(); i++)
 455                 {
 456                         delete Bindings[i];
 457                 }
 458                 ServerInstance->BufferedSocketCull();
 459                 Bindings.clear();
 460
 461                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 462                 {
 463                         std::string Type = Conf->ReadValue("bind","type",j);
 464                         std::string IP = Conf->ReadValue("bind","address",j);
 465                         std::string Port = Conf->ReadValue("bind","port",j);
 466                         std::string transport = Conf->ReadValue("bind","transport",j);
 467                         if (Type == "servers")
 468                         {
 469                                 irc::portparser portrange(Port, false);
 470                                 int portno = -1;
 471
 472                                 if (IP == "*")
 473                                         IP.clear();
 474
 475                                 while ((portno = portrange.GetToken()))
 476                                 {
 477                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 478                                         {
 479                                                 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?");
 480                                                 break;
 481                                         }
 482
 483                                         ServerSocketListener *listener = new ServerSocketListener(ServerInstance, this, portno, (char *)IP.c_str());
 484                                         if (listener->GetFd() == -1)
 485                                         {
 486                                                 delete listener;
 487                                                 continue;
 488                                         }
 489
 490                                         if (!transport.empty())
 491                                                 listener->AddIOHook(hooks[transport.c_str()]);
 492
 493                                         Bindings.push_back(listener);
 494                                 }
 495                         }
 496                 }
 497         }
 498         FlatLinks = Conf->ReadFlag("security","flatlinks",0);
 499         HideULines = Conf->ReadFlag("security","hideulines",0);
 500         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 501         ChallengeResponse = !Conf->ReadFlag("security", "disablehmac", 0);
 502         quiet_bursts = Conf->ReadFlag("performance", "quietbursts", 0);
 503         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 504         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 505
 506         if (PingFreq == 0)
 507                 PingFreq = 60;
 508
 509         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 510                 PingWarnTime = 0;
 511
 512         LinkBlocks.clear();
 513         ValidIPs.clear();
 514         for (int j = 0; j < Conf->Enumerate("link"); j++)
 515         {
 516                 Link L;
 517                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 518                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 519                 L.AllowMask = Allow;
 520                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 521                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 522                 L.Port = Conf->ReadInteger("link", "port", j, true);
 523                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 524                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 525                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 526                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 527                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 528                 L.Hook = Conf->ReadValue("link", "transport", j);
 529                 L.Bind = Conf->ReadValue("link", "bind", j);
 530                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 531
 532                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 533                 {
 534                         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.");
 535                         continue;
 536
 537                 }
 538
 539                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 540
 541                 if (L.Name.find('.') == std::string::npos)
 542                         throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 543
 544                 if (L.Name.length() > 64)
 545                         throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 546
 547                 if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 548                 {
 549                         if (Allow.length())
 550                                 ValidIPs.push_back(Allow);
 551
 552                         ValidIPs.push_back(L.IPAddr);
 553
 554                         /* Needs resolving */
 555                         bool ipvalid = true;
 556                         QueryType start_type = DNS_QUERY_A;
 557 #ifdef IPV6
 558                         start_type = DNS_QUERY_AAAA;
 559                         if (strchr(L.IPAddr.c_str(),':'))
 560                         {
 561                                 in6_addr n;
 562                                 if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 563                                         ipvalid = false;
 564                         }
 565                         else
 566                         {
 567                                 in_addr n;
 568                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 569                                         ipvalid = false;
 570                         }
 571 #else
 572                         in_addr n;
 573                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 574                                 ipvalid = false;
 575 #endif
 576
 577                         if (!ipvalid)
 578                         {
 579                                 try
 580                                 {
 581                                         bool cached;
 582                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 583                                         ServerInstance->AddResolver(sr, cached);
 584                                 }
 585                                 catch (...)
 586                                 {
 587                                 }
 588                         }
 589                 }
 590                 else
 591                 {
 592                         if (L.IPAddr.empty())
 593                         {
 594                                 L.IPAddr = "*";
 595                                 ValidIPs.push_back("*");
 596                                 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.");
 597                         }
 598
 599                         if (L.RecvPass.empty())
 600                         {
 601                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 602                         }
 603
 604                         if (L.SendPass.empty())
 605                         {
 606                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 607                         }
 608
 609                         if (L.Name.empty())
 610                         {
 611                                 throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 612                         }
 613
 614                         if (!L.Port)
 615                         {
 616                                 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.");
 617                         }
 618                 }
 619
 620                 LinkBlocks.push_back(L);
 621         }
 622         delete Conf;
 623 }
 624
 625 void SpanningTreeUtilities::DoFailOver(Link* x)
 626 {
 627         if (x->FailOver.length())
 628         {
 629                 if (x->FailOver == x->Name)
 630                 {
 631                         this->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());
 632                         return;
 633                 }
 634                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 635                 if (TryThisOne)
 636                 {
 637                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 638                         if (CheckDupe)
 639                         {
 640                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 641                         }
 642                         else
 643                         {
 644                                 this->ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 645                                 Creator->ConnectServer(TryThisOne);
 646                         }
 647                 }
 648                 else
 649                 {
 650                         this->ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 651                 }
 652         }
 653 }
 654
 655 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 656 {
 657         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 658         {
 659                 if (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 660                 {
 661                         return &(*x);
 662                 }
 663         }
 664         return NULL;
 665 }