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 "socket.h"
  16 #include "xline.h"
  17 #include "../transport.h"
  18 #include "socketengine.h"
  19
  20 #include "main.h"
  21 #include "utils.h"
  22 #include "treeserver.h"
  23 #include "link.h"
  24 #include "treesocket.h"
  25 #include "resolvers.h"
  26
  27 /* $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 */
  28
  29 /* Create server sockets off a listener. */
  30 void ServerSocketListener::OnAcceptReady(int newsock)
  31 {
  32         bool found = false;
  33         int port;
  34         std::string incomingip;
  35         irc::sockets::satoap(&client, incomingip, port);
  36         char *ip = const_cast<char*>(incomingip.c_str());
  37
  38         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
  39         if (!found)
  40         {
  41                 for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  42                 {
  43                         if (*i == "*" || irc::sockets::MatchCIDR(ip, *i))
  44                         {
  45                                 found = true;
  46                                 break;
  47                         }
  48                 }
  49
  50                 if (!found)
  51                 {
  52                         this->ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", ip);
  53                         ServerInstance->SE->Close(newsock);
  54                         return;
  55                 }
  56         }
  57
  58         if (this->GetIOHook())
  59         {
  60                 this->GetIOHook()->OnRawSocketAccept(newsock, &client, &server);
  61         }
  62
  63         /* we don't need a pointer to this, creating it stores it in the necessary places */
  64         new TreeSocket(this->Utils, this->ServerInstance, newsock, ip, this->GetIOHook());
  65         return;
  66 }
  67
  68 /** Yay for fast searches!
  69  * This is hundreds of times faster than recursion
  70  * or even scanning a linked list, especially when
  71  * there are more than a few servers to deal with.
  72  * (read as: lots).
  73  */
  74 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  75 {
  76         if (this->ServerInstance->IsSID(ServerName))
  77                 return this->FindServerID(ServerName);
  78
  79         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  80         if (iter != serverlist.end())
  81         {
  82                 return iter->second;
  83         }
  84         else
  85         {
  86                 return NULL;
  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() || ServerName == ServerInstance->Config->GetSID())
  99                 return NULL;
 100         TreeServer* Found = FindServer(ServerName);
 101         if (Found)
 102         {
 103                 return Found->GetRoute();
 104         }
 105         else
 106         {
 107                 // Cheat a bit. This allows for (better) working versions of routing commands with nick based prefixes, without hassle
 108                 User *u = ServerInstance->FindNick(ServerName);
 109                 if (u)
 110                 {
 111                         Found = FindServer(u->server);
 112                         if (Found)
 113                                 return Found->GetRoute();
 114                 }
 115
 116                 return NULL;
 117         }
 118 }
 119
 120 /** Find the first server matching a given glob mask.
 121  * Theres no find-using-glob method of hash_map [awwww :-(]
 122  * so instead, we iterate over the list using an iterator
 123  * and match each one until we get a hit. Yes its slow,
 124  * deal with it.
 125  */
 126 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 127 {
 128         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 129         {
 130                 if (InspIRCd::Match(i->first,ServerName))
 131                         return i->second;
 132         }
 133         return NULL;
 134 }
 135
 136 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 137 {
 138         server_hash::iterator iter = sidlist.find(id);
 139         if (iter != sidlist.end())
 140                 return iter->second;
 141         else
 142                 return NULL;
 143 }
 144
 145 /* A convenient wrapper that returns true if a server exists */
 146 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 147 {
 148         return (FindServer(ServerName) != NULL);
 149 }
 150
 151 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 152 {
 153         Bindings.clear();
 154
 155         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"***** Using SID for hash: %s *****", ServerInstance->Config->GetSID().c_str());
 156
 157         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 158         this->ServerUser = new FakeUser(ServerInstance, TreeRoot->GetID());
 159
 160         this->ReadConfiguration(true);
 161 }
 162
 163 SpanningTreeUtilities::~SpanningTreeUtilities()
 164 {
 165         for (unsigned int i = 0; i < Bindings.size(); i++)
 166         {
 167                 delete Bindings[i];
 168         }
 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                 }
 179         }
 180
 181         // This avoids a collision on reload
 182         ServerUser->uuid = TreeRoot->GetID();
 183         delete TreeRoot;
 184         delete ServerUser;
 185         ServerInstance->BufferedSocketCull();
 186 }
 187
 188 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 189 {
 190         if (list.find(server) == list.end())
 191                 list[server] = server;
 192 }
 193
 194 /* returns a list of DIRECT servernames for a specific channel */
 195 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 196 {
 197         const UserMembList *ulist = c->GetUsers();
 198
 199         for (UserMembCIter i = ulist->begin(); i != ulist->end(); i++)
 200         {
 201                 if (IS_LOCAL(i->first))
 202                         continue;
 203
 204                 if (status && !strchr(c->GetAllPrefixChars(i->first), status))
 205                         continue;
 206
 207                 if (exempt_list.find(i->first) == exempt_list.end())
 208                 {
 209                         TreeServer* best = this->BestRouteTo(i->first->server);
 210                         if (best)
 211                                 AddThisServer(best,list);
 212                 }
 213         }
 214         return;
 215 }
 216
 217 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, parameterlist &params)
 218 {
 219         char pfx = 0;
 220         TreeServer* omitroute = this->BestRouteTo(omit);
 221         if ((command == "NOTICE") || (command == "PRIVMSG"))
 222         {
 223                 if (params.size() >= 2)
 224                 {
 225                         /* Prefixes */
 226                         if (ServerInstance->Modes->FindPrefix(params[0][0]))
 227                         {
 228                                 pfx = params[0][0];
 229                                 params[0] = params[0].substr(1, params[0].length()-1);
 230                         }
 231                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 232                         {
 233                                 // special routing for private messages/notices
 234                                 User* d = ServerInstance->FindNick(params[0]);
 235                                 if (d)
 236                                 {
 237                                         parameterlist par;
 238                                         par.push_back(params[0]);
 239                                         par.push_back(":"+params[1]);
 240                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 241                                         return true;
 242                                 }
 243                         }
 244                         else if (*(params[0].c_str()) == '$')
 245                         {
 246                                 parameterlist par;
 247                                 par.push_back(params[0]);
 248                                 par.push_back(":"+params[1]);
 249                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 250                                 return true;
 251                         }
 252                         else
 253                         {
 254                                 Channel* c = ServerInstance->FindChan(params[0]);
 255                                 User* u = ServerInstance->FindNick(prefix);
 256                                 if (c)
 257                                 {
 258                                         CUList elist;
 259                                         TreeServerList list;
 260                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 261                                         GetListOfServersForChannel(c,list,pfx,elist);
 262
 263                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 264                                         {
 265                                                 TreeSocket* Sock = i->second->GetSocket();
 266                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 267                                                 {
 268                                                         Sock->WriteLine(data);
 269                                                 }
 270                                         }
 271                                         return true;
 272                                 }
 273                         }
 274                 }
 275         }
 276         unsigned int items =this->TreeRoot->ChildCount();
 277         for (unsigned int x = 0; x < items; x++)
 278         {
 279                 TreeServer* Route = this->TreeRoot->GetChild(x);
 280                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 281                 {
 282                         TreeSocket* Sock = Route->GetSocket();
 283                         if (Sock)
 284                                 Sock->WriteLine(data);
 285                 }
 286         }
 287         return true;
 288 }
 289
 290 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, parameterlist &params, std::string omit)
 291 {
 292         TreeServer* omitroute = this->BestRouteTo(omit);
 293         std::string FullLine = ":" + prefix + " " + command;
 294         unsigned int words = params.size();
 295         for (unsigned int x = 0; x < words; x++)
 296         {
 297                 FullLine = FullLine + " " + params[x];
 298         }
 299         unsigned int items = this->TreeRoot->ChildCount();
 300         for (unsigned int x = 0; x < items; x++)
 301         {
 302                 TreeServer* Route = this->TreeRoot->GetChild(x);
 303                 // Send the line IF:
 304                 // The route has a socket (its a direct connection)
 305                 // The route isnt the one to be omitted
 306                 // The route isnt the path to the one to be omitted
 307                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 308                 {
 309                         TreeSocket* Sock = Route->GetSocket();
 310                         if (Sock)
 311                                 Sock->WriteLine(FullLine);
 312                 }
 313         }
 314         return true;
 315 }
 316
 317 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, parameterlist &params)
 318 {
 319         std::string FullLine = ":" + prefix + " " + command;
 320         unsigned int words = params.size();
 321         for (unsigned int x = 0; x < words; x++)
 322         {
 323                 FullLine = FullLine + " " + params[x];
 324         }
 325         unsigned int items = this->TreeRoot->ChildCount();
 326         for (unsigned int x = 0; x < items; x++)
 327         {
 328                 TreeServer* Route = this->TreeRoot->GetChild(x);
 329                 if (Route && Route->GetSocket())
 330                 {
 331                         TreeSocket* Sock = Route->GetSocket();
 332                         if (Sock)
 333                                 Sock->WriteLine(FullLine);
 334                 }
 335         }
 336         return true;
 337 }
 338
 339 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, parameterlist &params)
 340 {
 341         std::string spfx = prefix;
 342         std::string scmd = command;
 343         return this->DoOneToMany(spfx, scmd, params);
 344 }
 345
 346 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, parameterlist &params, std::string omit)
 347 {
 348         std::string spfx = prefix;
 349         std::string scmd = command;
 350         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 351 }
 352
 353 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, parameterlist &params, std::string target)
 354 {
 355         TreeServer* Route = this->BestRouteTo(target);
 356         if (Route)
 357         {
 358                 std::string FullLine = ":" + prefix + " " + command;
 359                 unsigned int words = params.size();
 360                 for (unsigned int x = 0; x < words; x++)
 361                 {
 362                         FullLine = FullLine + " " + params[x];
 363                 }
 364                 if (Route && Route->GetSocket())
 365                 {
 366                         TreeSocket* Sock = Route->GetSocket();
 367                         if (Sock)
 368                                 Sock->WriteLine(FullLine);
 369                 }
 370                 return true;
 371         }
 372         else
 373         {
 374                 return false;
 375         }
 376 }
 377
 378 void SpanningTreeUtilities::RefreshIPCache()
 379 {
 380         ValidIPs.clear();
 381         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 382         {
 383                 if (L->IPAddr.empty() || L->RecvPass.empty() || L->SendPass.empty() || L->Name.empty() || !L->Port)
 384                 {
 385                         if (L->Name.empty())
 386                         {
 387                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a malformed link block (all link blocks require a name!)");
 388                         }
 389                         else
 390                         {
 391                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a link block missing recvpass, sendpass, port or ipaddr.");
 392                         }
 393
 394                         /* Invalid link block */
 395                         continue;
 396                 }
 397
 398                 ValidIPs.push_back(L->IPAddr);
 399
 400                 if (L->AllowMask.length())
 401                         ValidIPs.push_back(L->AllowMask);
 402
 403                 /* Needs resolving */
 404                 bool ipvalid = true;
 405                 QueryType start_type = DNS_QUERY_A;
 406                 start_type = DNS_QUERY_AAAA;
 407                 if (strchr(L->IPAddr.c_str(),':'))
 408                 {
 409                         in6_addr n;
 410                         if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 411                                 ipvalid = false;
 412                 }
 413                 else
 414                 {
 415                         in_addr n;
 416                         if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 417                                 ipvalid = false;
 418                 }
 419
 420                 if (!ipvalid)
 421                 {
 422                         try
 423                         {
 424                                 bool cached;
 425                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 426                                 ServerInstance->AddResolver(sr, cached);
 427                         }
 428                         catch (...)
 429                         {
 430                         }
 431                 }
 432         }
 433 }
 434
 435 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 436 {
 437         ConfigReader* Conf = new ConfigReader(ServerInstance);
 438
 439         /* We don't need to worry about these being *unloaded* on the fly, only loaded,
 440          * because we 'use' the interface locking the module in memory.
 441          */
 442         hooks.clear();
 443         hooknames.clear();
 444         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 445
 446         /* Did we find any modules? */
 447         if (ml)
 448         {
 449                 /* Yes, enumerate them all to find out the hook name */
 450                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 451                 {
 452                         /* Make a request to it for its name, its implementing
 453                          * BufferedSocketHook so we know its safe to do this
 454                          */
 455                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 456                         /* Build a map of them */
 457                         hooks[name.c_str()] = *m;
 458                         hooknames.push_back(name);
 459                 }
 460         }
 461
 462         if (rebind)
 463         {
 464                 for (unsigned int i = 0; i < Bindings.size(); i++)
 465                 {
 466                         delete Bindings[i];
 467                 }
 468                 ServerInstance->BufferedSocketCull();
 469                 Bindings.clear();
 470
 471                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 472                 {
 473                         std::string Type = Conf->ReadValue("bind","type",j);
 474                         std::string IP = Conf->ReadValue("bind","address",j);
 475                         std::string Port = Conf->ReadValue("bind","port",j);
 476                         std::string transport = Conf->ReadValue("bind","transport",j);
 477                         if (Type == "servers")
 478                         {
 479                                 irc::portparser portrange(Port, false);
 480                                 int portno = -1;
 481
 482                                 if (IP == "*")
 483                                         IP.clear();
 484
 485                                 while ((portno = portrange.GetToken()))
 486                                 {
 487                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 488                                         {
 489                                                 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?");
 490                                                 break;
 491                                         }
 492
 493                                         ServerSocketListener *listener = new ServerSocketListener(ServerInstance, this, portno, (char *)IP.c_str());
 494                                         if (listener->GetFd() == -1)
 495                                         {
 496                                                 delete listener;
 497                                                 continue;
 498                                         }
 499
 500                                         if (!transport.empty())
 501                                                 listener->AddIOHook(hooks[transport.c_str()]);
 502
 503                                         Bindings.push_back(listener);
 504                                 }
 505                         }
 506                 }
 507         }
 508         FlatLinks = Conf->ReadFlag("security","flatlinks",0);
 509         HideULines = Conf->ReadFlag("security","hideulines",0);
 510         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 511         AllowOptCommon = Conf->ReadFlag("options", "allowmismatch", 0);
 512         ChallengeResponse = !Conf->ReadFlag("security", "disablehmac", 0);
 513         quiet_bursts = Conf->ReadFlag("performance", "quietbursts", 0);
 514         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 515         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 516
 517         if (PingFreq == 0)
 518                 PingFreq = 60;
 519
 520         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 521                 PingWarnTime = 0;
 522
 523         LinkBlocks.clear();
 524         ValidIPs.clear();
 525         for (int j = 0; j < Conf->Enumerate("link"); j++)
 526         {
 527                 Link L;
 528                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 529                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 530                 L.AllowMask = Allow;
 531                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 532                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 533                 L.Port = Conf->ReadInteger("link", "port", j, true);
 534                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 535                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 536                 L.Fingerprint = Conf->ReadValue("link", "fingerprint", j);
 537                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 538                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 539                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 540                 L.Hook = Conf->ReadValue("link", "transport", j);
 541                 L.Bind = Conf->ReadValue("link", "bind", j);
 542                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 543
 544                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 545                 {
 546                         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.");
 547                         continue;
 548
 549                 }
 550
 551                 // Fix: Only trip autoconnects if this wouldn't delay autoconnect..
 552                 if (L.NextConnectTime > ((time_t)(ServerInstance->Time() + L.AutoConnect)))
 553                         L.NextConnectTime = ServerInstance->Time() + L.AutoConnect;
 554
 555                 if (L.Name.find('.') == std::string::npos)
 556                         throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 557
 558                 if (L.Name.length() > 64)
 559                         throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 560
 561                 if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 562                 {
 563                         if (Allow.length())
 564                                 ValidIPs.push_back(Allow);
 565
 566                         ValidIPs.push_back(L.IPAddr);
 567
 568                         /* Needs resolving */
 569                         bool ipvalid = true;
 570                         QueryType start_type = DNS_QUERY_A;
 571                         start_type = DNS_QUERY_AAAA;
 572                         if (strchr(L.IPAddr.c_str(),':'))
 573                         {
 574                                 in6_addr n;
 575                                 if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 576                                         ipvalid = false;
 577                         }
 578                         else
 579                         {
 580                                 in_addr n;
 581                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 582                                         ipvalid = false;
 583                         }
 584
 585                         if (!ipvalid)
 586                         {
 587                                 try
 588                                 {
 589                                         bool cached;
 590                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 591                                         ServerInstance->AddResolver(sr, cached);
 592                                 }
 593                                 catch (...)
 594                                 {
 595                                 }
 596                         }
 597                 }
 598                 else
 599                 {
 600                         if (L.IPAddr.empty())
 601                         {
 602                                 L.IPAddr = "*";
 603                                 ValidIPs.push_back("*");
 604                                 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.");
 605                         }
 606
 607                         if (L.RecvPass.empty())
 608                         {
 609                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 610                         }
 611
 612                         if (L.SendPass.empty())
 613                         {
 614                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 615                         }
 616
 617                         if (L.Name.empty())
 618                         {
 619                                 throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 620                         }
 621
 622                         if (!L.Port)
 623                         {
 624                                 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.");
 625                         }
 626                 }
 627
 628                 LinkBlocks.push_back(L);
 629         }
 630         delete Conf;
 631 }
 632
 633 void SpanningTreeUtilities::DoFailOver(Link* x)
 634 {
 635         if (x->FailOver.length())
 636         {
 637                 if (x->FailOver == x->Name)
 638                 {
 639                         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());
 640                         return;
 641                 }
 642                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 643                 if (TryThisOne)
 644                 {
 645                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 646                         if (CheckDupe)
 647                         {
 648                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 649                         }
 650                         else
 651                         {
 652                                 this->ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 653                                 Creator->ConnectServer(TryThisOne);
 654                         }
 655                 }
 656                 else
 657                 {
 658                         this->ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 659                 }
 660         }
 661 }
 662
 663 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 664 {
 665         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x != LinkBlocks.end(); x++)
 666         {
 667                 if (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 668                 {
 669                         return &(*x);
 670                 }
 671         }
 672         return NULL;
 673 }