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