src/modules/m_spanningtree/utils.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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 "main.h"
  23 #include "utils.h"
  24 #include "treeserver.h"
  25 #include "link.h"
  26 #include "treesocket.h"
  27 #include "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(int newsock)
  33 {
  34         bool found = false;
  35         int port;
  36         std::string incomingip;
  37         irc::sockets::satoap(&client, incomingip, port);
  38         char *ip = const_cast<char*>(incomingip.c_str());
  39
  40         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
  41         if (!found)
  42         {
  43                 for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  44                 {
  45                         if (*i == "*" || irc::sockets::MatchCIDR(ip, *i))
  46                         {
  47                                 found = true;
  48                                 break;
  49                         }
  50                 }
  51
  52                 if (!found)
  53                 {
  54                         this->ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", ip);
  55                         ServerInstance->SE->Close(newsock);
  56                         return;
  57                 }
  58         }
  59
  60         if (this->GetIOHook())
  61         {
  62                 this->GetIOHook()->OnRawSocketAccept(newsock, &client, &server);
  63         }
  64
  65         /* we don't need a pointer to this, creating it stores it in the necessary places */
  66         new TreeSocket(this->Utils, this->ServerInstance, newsock, ip, this->GetIOHook());
  67         return;
  68 }
  69
  70 /** Yay for fast searches!
  71  * This is hundreds of times faster than recursion
  72  * or even scanning a linked list, especially when
  73  * there are more than a few servers to deal with.
  74  * (read as: lots).
  75  */
  76 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  77 {
  78         if (this->ServerInstance->IsSID(ServerName))
  79                 return this->FindServerID(ServerName);
  80
  81         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  82         if (iter != serverlist.end())
  83         {
  84                 return iter->second;
  85         }
  86         else
  87         {
  88                 return NULL;
  89         }
  90 }
  91
  92 /** Returns the locally connected server we must route a
  93  * message through to reach server 'ServerName'. This
  94  * only applies to one-to-one and not one-to-many routing.
  95  * See the comments for the constructor of TreeServer
  96  * for more details.
  97  */
  98 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
  99 {
 100         if (ServerName.c_str() == TreeRoot->GetName() || ServerName == ServerInstance->Config->GetSID())
 101                 return NULL;
 102         TreeServer* Found = FindServer(ServerName);
 103         if (Found)
 104         {
 105                 return Found->GetRoute();
 106         }
 107         else
 108         {
 109                 // Cheat a bit. This allows for (better) working versions of routing commands with nick based prefixes, without hassle
 110                 User *u = ServerInstance->FindNick(ServerName);
 111                 if (u)
 112                 {
 113                         Found = FindServer(u->server);
 114                         if (Found)
 115                                 return Found->GetRoute();
 116                 }
 117
 118                 return NULL;
 119         }
 120 }
 121
 122 /** Find the first server matching a given glob mask.
 123  * Theres no find-using-glob method of hash_map [awwww :-(]
 124  * so instead, we iterate over the list using an iterator
 125  * and match each one until we get a hit. Yes its slow,
 126  * deal with it.
 127  */
 128 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 129 {
 130         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 131         {
 132                 if (InspIRCd::Match(i->first,ServerName))
 133                         return i->second;
 134         }
 135         return NULL;
 136 }
 137
 138 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 139 {
 140         server_hash::iterator iter = sidlist.find(id);
 141         if (iter != sidlist.end())
 142                 return iter->second;
 143         else
 144                 return NULL;
 145 }
 146
 147 /* A convenient wrapper that returns true if a server exists */
 148 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 149 {
 150         return (FindServer(ServerName) != NULL);
 151 }
 152
 153 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 154 {
 155         Bindings.clear();
 156
 157         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"***** Using SID for hash: %s *****", ServerInstance->Config->GetSID().c_str());
 158
 159         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 160         this->ServerUser = new FakeUser(ServerInstance, TreeRoot->GetID());
 161
 162         this->ReadConfiguration(true);
 163 }
 164
 165 SpanningTreeUtilities::~SpanningTreeUtilities()
 166 {
 167         for (unsigned int i = 0; i < Bindings.size(); i++)
 168         {
 169                 delete Bindings[i];
 170         }
 171
 172         while (TreeRoot->ChildCount())
 173         {
 174                 TreeServer* child_server = TreeRoot->GetChild(0);
 175                 if (child_server)
 176                 {
 177                         TreeSocket* sock = child_server->GetSocket();
 178                         ServerInstance->SE->DelFd(sock);
 179                         sock->Close();
 180                 }
 181         }
 182
 183         // This avoids a collision on reload
 184         ServerUser->uuid = TreeRoot->GetID();
 185         delete TreeRoot;
 186         delete ServerUser;
 187         ServerInstance->BufferedSocketCull();
 188 }
 189
 190 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 191 {
 192         if (list.find(server) == list.end())
 193                 list[server] = server;
 194 }
 195
 196 /* returns a list of DIRECT servernames for a specific channel */
 197 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 198 {
 199         CUList *ulist = c->GetUsers();
 200
 201         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 202         {
 203                 if (IS_LOCAL(i->first))
 204                         continue;
 205
 206                 if (status && !strchr(c->GetAllPrefixChars(i->first), status))
 207                         continue;
 208
 209                 if (exempt_list.find(i->first) == exempt_list.end())
 210                 {
 211                         TreeServer* best = this->BestRouteTo(i->first->server);
 212                         if (best)
 213                                 AddThisServer(best,list);
 214                 }
 215         }
 216         return;
 217 }
 218
 219 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, parameterlist &params)
 220 {
 221         char pfx = 0;
 222         TreeServer* omitroute = this->BestRouteTo(omit);
 223         if ((command == "NOTICE") || (command == "PRIVMSG"))
 224         {
 225                 if (params.size() >= 2)
 226                 {
 227                         /* Prefixes */
 228                         if (ServerInstance->Modes->FindPrefix(params[0][0]))
 229                         {
 230                                 pfx = params[0][0];
 231                                 params[0] = params[0].substr(1, params[0].length()-1);
 232                         }
 233                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 234                         {
 235                                 // special routing for private messages/notices
 236                                 User* d = ServerInstance->FindNick(params[0]);
 237                                 if (d)
 238                                 {
 239                                         parameterlist par;
 240                                         par.push_back(params[0]);
 241                                         par.push_back(":"+params[1]);
 242                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 243                                         return true;
 244                                 }
 245                         }
 246                         else if (*(params[0].c_str()) == '$')
 247                         {
 248                                 parameterlist par;
 249                                 par.push_back(params[0]);
 250                                 par.push_back(":"+params[1]);
 251                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 252                                 return true;
 253                         }
 254                         else
 255                         {
 256                                 Channel* c = ServerInstance->FindChan(params[0]);
 257                                 User* u = ServerInstance->FindNick(prefix);
 258                                 if (c)
 259                                 {
 260                                         CUList elist;
 261                                         TreeServerList list;
 262                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 263                                         GetListOfServersForChannel(c,list,pfx,elist);
 264
 265                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 266                                         {
 267                                                 TreeSocket* Sock = i->second->GetSocket();
 268                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 269                                                 {
 270                                                         Sock->WriteLine(data);
 271                                                 }
 272                                         }
 273                                         return true;
 274                                 }
 275                         }
 276                 }
 277         }
 278         unsigned int items =this->TreeRoot->ChildCount();
 279         for (unsigned int x = 0; x < items; x++)
 280         {
 281                 TreeServer* Route = this->TreeRoot->GetChild(x);
 282                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 283                 {
 284                         TreeSocket* Sock = Route->GetSocket();
 285                         if (Sock)
 286                                 Sock->WriteLine(data);
 287                 }
 288         }
 289         return true;
 290 }
 291
 292 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, parameterlist &params, std::string omit)
 293 {
 294         TreeServer* omitroute = this->BestRouteTo(omit);
 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                 // Send the line IF:
 306                 // The route has a socket (its a direct connection)
 307                 // The route isnt the one to be omitted
 308                 // The route isnt the path to the one to be omitted
 309                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 310                 {
 311                         TreeSocket* Sock = Route->GetSocket();
 312                         if (Sock)
 313                                 Sock->WriteLine(FullLine);
 314                 }
 315         }
 316         return true;
 317 }
 318
 319 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, parameterlist &params)
 320 {
 321         std::string FullLine = ":" + prefix + " " + command;
 322         unsigned int words = params.size();
 323         for (unsigned int x = 0; x < words; x++)
 324         {
 325                 FullLine = FullLine + " " + params[x];
 326         }
 327         unsigned int items = this->TreeRoot->ChildCount();
 328         for (unsigned int x = 0; x < items; x++)
 329         {
 330                 TreeServer* Route = this->TreeRoot->GetChild(x);
 331                 if (Route && Route->GetSocket())
 332                 {
 333                         TreeSocket* Sock = Route->GetSocket();
 334                         if (Sock)
 335                                 Sock->WriteLine(FullLine);
 336                 }
 337         }
 338         return true;
 339 }
 340
 341 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, parameterlist &params)
 342 {
 343         std::string spfx = prefix;
 344         std::string scmd = command;
 345         return this->DoOneToMany(spfx, scmd, params);
 346 }
 347
 348 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, parameterlist &params, std::string omit)
 349 {
 350         std::string spfx = prefix;
 351         std::string scmd = command;
 352         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 353 }
 354
 355 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, parameterlist &params, std::string target)
 356 {
 357         TreeServer* Route = this->BestRouteTo(target);
 358         if (Route)
 359         {
 360                 std::string FullLine = ":" + prefix + " " + command;
 361                 unsigned int words = params.size();
 362                 for (unsigned int x = 0; x < words; x++)
 363                 {
 364                         FullLine = FullLine + " " + params[x];
 365                 }
 366                 if (Route && Route->GetSocket())
 367                 {
 368                         TreeSocket* Sock = Route->GetSocket();
 369                         if (Sock)
 370                                 Sock->WriteLine(FullLine);
 371                 }
 372                 return true;
 373         }
 374         else
 375         {
 376                 return false;
 377         }
 378 }
 379
 380 void SpanningTreeUtilities::RefreshIPCache()
 381 {
 382         ValidIPs.clear();
 383         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 384         {
 385                 if (L->IPAddr.empty() || L->RecvPass.empty() || L->SendPass.empty() || L->Name.empty() || !L->Port)
 386                 {
 387                         if (L->Name.empty())
 388                         {
 389                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a malformed link block (all link blocks require a name!)");
 390                         }
 391                         else
 392                         {
 393                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a link block missing recvpass, sendpass, port or ipaddr.");
 394                         }
 395
 396                         /* Invalid link block */
 397                         continue;
 398                 }
 399
 400                 ValidIPs.push_back(L->IPAddr);
 401
 402                 if (L->AllowMask.length())
 403                         ValidIPs.push_back(L->AllowMask);
 404
 405                 /* Needs resolving */
 406                 bool ipvalid = true;
 407                 QueryType start_type = DNS_QUERY_A;
 408                 start_type = DNS_QUERY_AAAA;
 409                 if (strchr(L->IPAddr.c_str(),':'))
 410                 {
 411                         in6_addr n;
 412                         if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 413                                 ipvalid = false;
 414                 }
 415                 else
 416                 {
 417                         in_addr n;
 418                         if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 419                                 ipvalid = false;
 420                 }
 421
 422                 if (!ipvalid)
 423                 {
 424                         try
 425                         {
 426                                 bool cached;
 427                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 428                                 ServerInstance->AddResolver(sr, cached);
 429                         }
 430                         catch (...)
 431                         {
 432                         }
 433                 }
 434         }
 435 }
 436
 437 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 438 {
 439         ConfigReader* Conf = new ConfigReader(ServerInstance);
 440
 441         /* We don't need to worry about these being *unloaded* on the fly, only loaded,
 442          * because we 'use' the interface locking the module in memory.
 443          */
 444         hooks.clear();
 445         hooknames.clear();
 446         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 447
 448         /* Did we find any modules? */
 449         if (ml)
 450         {
 451                 /* Yes, enumerate them all to find out the hook name */
 452                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 453                 {
 454                         /* Make a request to it for its name, its implementing
 455                          * BufferedSocketHook so we know its safe to do this
 456                          */
 457                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 458                         /* Build a map of them */
 459                         hooks[name.c_str()] = *m;
 460                         hooknames.push_back(name);
 461                 }
 462         }
 463
 464         if (rebind)
 465         {
 466                 for (unsigned int i = 0; i < Bindings.size(); i++)
 467                 {
 468                         delete Bindings[i];
 469                 }
 470                 ServerInstance->BufferedSocketCull();
 471                 Bindings.clear();
 472
 473                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 474                 {
 475                         std::string Type = Conf->ReadValue("bind","type",j);
 476                         std::string IP = Conf->ReadValue("bind","address",j);
 477                         std::string Port = Conf->ReadValue("bind","port",j);
 478                         std::string transport = Conf->ReadValue("bind","transport",j);
 479                         if (Type == "servers")
 480                         {
 481                                 irc::portparser portrange(Port, false);
 482                                 int portno = -1;
 483
 484                                 if (IP == "*")
 485                                         IP.clear();
 486
 487                                 while ((portno = portrange.GetToken()))
 488                                 {
 489                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 490                                         {
 491                                                 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?");
 492                                                 break;
 493                                         }
 494
 495                                         ServerSocketListener *listener = new ServerSocketListener(ServerInstance, this, portno, (char *)IP.c_str());
 496                                         if (listener->GetFd() == -1)
 497                                         {
 498                                                 delete listener;
 499                                                 continue;
 500                                         }
 501
 502                                         if (!transport.empty())
 503                                                 listener->AddIOHook(hooks[transport.c_str()]);
 504
 505                                         Bindings.push_back(listener);
 506                                 }
 507                         }
 508                 }
 509         }
 510         FlatLinks = Conf->ReadFlag("security","flatlinks",0);
 511         HideULines = Conf->ReadFlag("security","hideulines",0);
 512         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 513         ChallengeResponse = !Conf->ReadFlag("security", "disablehmac", 0);
 514         quiet_bursts = Conf->ReadFlag("performance", "quietbursts", 0);
 515         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 516         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 517
 518         if (PingFreq == 0)
 519                 PingFreq = 60;
 520
 521         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 522                 PingWarnTime = 0;
 523
 524         LinkBlocks.clear();
 525         ValidIPs.clear();
 526         for (int j = 0; j < Conf->Enumerate("link"); j++)
 527         {
 528                 Link L;
 529                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 530                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 531                 L.AllowMask = Allow;
 532                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 533                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 534                 L.Port = Conf->ReadInteger("link", "port", j, true);
 535                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 536                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 537                 L.Fingerprint = Conf->ReadValue("link", "fingerprint", j);
 538                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 539                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 540                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 541                 L.Hook = Conf->ReadValue("link", "transport", j);
 542                 L.Bind = Conf->ReadValue("link", "bind", j);
 543                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 544
 545                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 546                 {
 547                         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.");
 548                         continue;
 549
 550                 }
 551
 552                 // Fix: Only trip autoconnects if this wouldn't delay autoconnect..
 553                 if (L.NextConnectTime > ((time_t)(ServerInstance->Time() + L.AutoConnect)))
 554                         L.NextConnectTime = ServerInstance->Time() + L.AutoConnect;
 555
 556                 if (L.Name.find('.') == std::string::npos)
 557                         throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 558
 559                 if (L.Name.length() > 64)
 560                         throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 561
 562                 if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 563                 {
 564                         if (Allow.length())
 565                                 ValidIPs.push_back(Allow);
 566
 567                         ValidIPs.push_back(L.IPAddr);
 568
 569                         /* Needs resolving */
 570                         bool ipvalid = true;
 571                         QueryType start_type = DNS_QUERY_A;
 572                         start_type = DNS_QUERY_AAAA;
 573                         if (strchr(L.IPAddr.c_str(),':'))
 574                         {
 575                                 in6_addr n;
 576                                 if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 577                                         ipvalid = false;
 578                         }
 579                         else
 580                         {
 581                                 in_addr n;
 582                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 583                                         ipvalid = false;
 584                         }
 585
 586                         if (!ipvalid)
 587                         {
 588                                 try
 589                                 {
 590                                         bool cached;
 591                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 592                                         ServerInstance->AddResolver(sr, cached);
 593                                 }
 594                                 catch (...)
 595                                 {
 596                                 }
 597                         }
 598                 }
 599                 else
 600                 {
 601                         if (L.IPAddr.empty())
 602                         {
 603                                 L.IPAddr = "*";
 604                                 ValidIPs.push_back("*");
 605                                 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.");
 606                         }
 607
 608                         if (L.RecvPass.empty())
 609                         {
 610                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 611                         }
 612
 613                         if (L.SendPass.empty())
 614                         {
 615                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 616                         }
 617
 618                         if (L.Name.empty())
 619                         {
 620                                 throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 621                         }
 622
 623                         if (!L.Port)
 624                         {
 625                                 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.");
 626                         }
 627                 }
 628
 629                 LinkBlocks.push_back(L);
 630         }
 631         delete Conf;
 632 }
 633
 634 void SpanningTreeUtilities::DoFailOver(Link* x)
 635 {
 636         if (x->FailOver.length())
 637         {
 638                 if (x->FailOver == x->Name)
 639                 {
 640                         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());
 641                         return;
 642                 }
 643                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 644                 if (TryThisOne)
 645                 {
 646                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 647                         if (CheckDupe)
 648                         {
 649                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 650                         }
 651                         else
 652                         {
 653                                 this->ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 654                                 Creator->ConnectServer(TryThisOne);
 655                         }
 656                 }
 657                 else
 658                 {
 659                         this->ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 660                 }
 661         }
 662 }
 663
 664 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 665 {
 666         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x != LinkBlocks.end(); x++)
 667         {
 668                 if (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 669                 {
 670                         return &(*x);
 671                 }
 672         }
 673         return NULL;
 674 }