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 /** Yay for fast searches!
  32  * This is hundreds of times faster than recursion
  33  * or even scanning a linked list, especially when
  34  * there are more than a few servers to deal with.
  35  * (read as: lots).
  36  */
  37 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  38 {
  39         if (this->ServerInstance->IsSID(ServerName))
  40                 return this->FindServerID(ServerName);
  41
  42         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  43         if (iter != serverlist.end())
  44         {
  45                 return iter->second;
  46         }
  47         else
  48         {
  49                 return NULL;
  50         }
  51 }
  52
  53 /** Returns the locally connected server we must route a
  54  * message through to reach server 'ServerName'. This
  55  * only applies to one-to-one and not one-to-many routing.
  56  * See the comments for the constructor of TreeServer
  57  * for more details.
  58  */
  59 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
  60 {
  61         if (ServerName.c_str() == TreeRoot->GetName() || ServerName == ServerInstance->Config->GetSID())
  62                 return NULL;
  63         TreeServer* Found = FindServer(ServerName);
  64         if (Found)
  65         {
  66                 return Found->GetRoute();
  67         }
  68         else
  69         {
  70                 // Cheat a bit. This allows for (better) working versions of routing commands with nick based prefixes, without hassle
  71                 User *u = ServerInstance->FindNick(ServerName);
  72                 if (u)
  73                 {
  74                         Found = FindServer(u->server);
  75                         if (Found)
  76                                 return Found->GetRoute();
  77                 }
  78
  79                 return NULL;
  80         }
  81 }
  82
  83 /** Find the first server matching a given glob mask.
  84  * Theres no find-using-glob method of hash_map [awwww :-(]
  85  * so instead, we iterate over the list using an iterator
  86  * and match each one until we get a hit. Yes its slow,
  87  * deal with it.
  88  */
  89 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
  90 {
  91         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
  92         {
  93                 if (InspIRCd::Match(i->first,ServerName))
  94                         return i->second;
  95         }
  96         return NULL;
  97 }
  98
  99 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 100 {
 101         server_hash::iterator iter = sidlist.find(id);
 102         if (iter != sidlist.end())
 103                 return iter->second;
 104         else
 105                 return NULL;
 106 }
 107
 108 /* A convenient wrapper that returns true if a server exists */
 109 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 110 {
 111         return (FindServer(ServerName) != NULL);
 112 }
 113
 114 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 115 {
 116         Bindings.clear();
 117
 118         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"***** Using SID for hash: %s *****", ServerInstance->Config->GetSID().c_str());
 119
 120         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 121
 122         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 123
 124         /* Did we find any modules? */
 125         if (ml)
 126         {
 127                 /* Yes, enumerate them all to find out the hook name */
 128                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 129                 {
 130                         /* Make a request to it for its name, its implementing
 131                          * BufferedSocketHook so we know its safe to do this
 132                          */
 133                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 134                         /* Build a map of them */
 135                         hooks[name.c_str()] = *m;
 136                         hooknames.push_back(name);
 137                 }
 138         }
 139
 140         this->ReadConfiguration(true);
 141 }
 142
 143 SpanningTreeUtilities::~SpanningTreeUtilities()
 144 {
 145         for (unsigned int i = 0; i < Bindings.size(); i++)
 146         {
 147                 ServerInstance->SE->DelFd(Bindings[i]);
 148                 Bindings[i]->Close();
 149         }
 150         while (TreeRoot->ChildCount())
 151         {
 152                 TreeServer* child_server = TreeRoot->GetChild(0);
 153                 if (child_server)
 154                 {
 155                         TreeSocket* sock = child_server->GetSocket();
 156                         ServerInstance->SE->DelFd(sock);
 157                         sock->Close();
 158                 }
 159         }
 160         delete TreeRoot;
 161         ServerInstance->BufferedSocketCull();
 162 }
 163
 164 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 165 {
 166         if (list.find(server) == list.end())
 167                 list[server] = server;
 168 }
 169
 170 /* returns a list of DIRECT servernames for a specific channel */
 171 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 172 {
 173         CUList *ulist = c->GetUsers();
 174
 175         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 176         {
 177                 if (IS_LOCAL(i->first))
 178                         continue;
 179
 180                 if (status && !strchr(c->GetAllPrefixChars(i->first), status))
 181                         continue;
 182
 183                 if (exempt_list.find(i->first) == exempt_list.end())
 184                 {
 185                         TreeServer* best = this->BestRouteTo(i->first->server);
 186                         if (best)
 187                                 AddThisServer(best,list);
 188                 }
 189         }
 190         return;
 191 }
 192
 193 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 194 {
 195         char pfx = 0;
 196         TreeServer* omitroute = this->BestRouteTo(omit);
 197         if ((command == "NOTICE") || (command == "PRIVMSG"))
 198         {
 199                 if (params.size() >= 2)
 200                 {
 201                         /* Prefixes */
 202                         if (ServerInstance->Modes->FindPrefix(params[0][0]))
 203                         {
 204                                 pfx = params[0][0];
 205                                 params[0] = params[0].substr(1, params[0].length()-1);
 206                         }
 207                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 208                         {
 209                                 // special routing for private messages/notices
 210                                 User* d = ServerInstance->FindNick(params[0]);
 211                                 if (d)
 212                                 {
 213                                         std::deque<std::string> par;
 214                                         par.push_back(params[0]);
 215                                         par.push_back(":"+params[1]);
 216                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 217                                         return true;
 218                                 }
 219                         }
 220                         else if (*(params[0].c_str()) == '$')
 221                         {
 222                                 std::deque<std::string> par;
 223                                 par.push_back(params[0]);
 224                                 par.push_back(":"+params[1]);
 225                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 226                                 return true;
 227                         }
 228                         else
 229                         {
 230                                 Channel* c = ServerInstance->FindChan(params[0]);
 231                                 User* u = ServerInstance->FindNick(prefix);
 232                                 if (c)
 233                                 {
 234                                         CUList elist;
 235                                         TreeServerList list;
 236                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 237                                         GetListOfServersForChannel(c,list,pfx,elist);
 238
 239                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 240                                         {
 241                                                 TreeSocket* Sock = i->second->GetSocket();
 242                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 243                                                 {
 244                                                         Sock->WriteLine(data);
 245                                                 }
 246                                         }
 247                                         return true;
 248                                 }
 249                         }
 250                 }
 251         }
 252         unsigned int items =this->TreeRoot->ChildCount();
 253         for (unsigned int x = 0; x < items; x++)
 254         {
 255                 TreeServer* Route = this->TreeRoot->GetChild(x);
 256                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 257                 {
 258                         TreeSocket* Sock = Route->GetSocket();
 259                         if (Sock)
 260                                 Sock->WriteLine(data);
 261                 }
 262         }
 263         return true;
 264 }
 265
 266 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 267 {
 268         TreeServer* omitroute = this->BestRouteTo(omit);
 269         std::string FullLine = ":" + prefix + " " + command;
 270         unsigned int words = params.size();
 271         for (unsigned int x = 0; x < words; x++)
 272         {
 273                 FullLine = FullLine + " " + params[x];
 274         }
 275         unsigned int items = this->TreeRoot->ChildCount();
 276         for (unsigned int x = 0; x < items; x++)
 277         {
 278                 TreeServer* Route = this->TreeRoot->GetChild(x);
 279                 // Send the line IF:
 280                 // The route has a socket (its a direct connection)
 281                 // The route isnt the one to be omitted
 282                 // The route isnt the path to the one to be omitted
 283                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 284                 {
 285                         TreeSocket* Sock = Route->GetSocket();
 286                         if (Sock)
 287                                 Sock->WriteLine(FullLine);
 288                 }
 289         }
 290         return true;
 291 }
 292
 293 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 294 {
 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                 if (Route && Route->GetSocket())
 306                 {
 307                         TreeSocket* Sock = Route->GetSocket();
 308                         if (Sock)
 309                                 Sock->WriteLine(FullLine);
 310                 }
 311         }
 312         return true;
 313 }
 314
 315 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 316 {
 317         std::string spfx = prefix;
 318         std::string scmd = command;
 319         return this->DoOneToMany(spfx, scmd, params);
 320 }
 321
 322 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 323 {
 324         std::string spfx = prefix;
 325         std::string scmd = command;
 326         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 327 }
 328
 329 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 330 {
 331         TreeServer* Route = this->BestRouteTo(target);
 332         if (Route)
 333         {
 334                 std::string FullLine = ":" + prefix + " " + command;
 335                 unsigned int words = params.size();
 336                 for (unsigned int x = 0; x < words; x++)
 337                 {
 338                         FullLine = FullLine + " " + params[x];
 339                 }
 340                 if (Route && Route->GetSocket())
 341                 {
 342                         TreeSocket* Sock = Route->GetSocket();
 343                         if (Sock)
 344                                 Sock->WriteLine(FullLine);
 345                 }
 346                 return true;
 347         }
 348         else
 349         {
 350                 return false;
 351         }
 352 }
 353
 354 void SpanningTreeUtilities::RefreshIPCache()
 355 {
 356         ValidIPs.clear();
 357         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 358         {
 359                 if (L->IPAddr.empty() || L->RecvPass.empty() || L->SendPass.empty() || L->Name.empty() || !L->Port)
 360                 {
 361                         if (L->Name.empty())
 362                         {
 363                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a malformed link block (all link blocks require a name!)");
 364                         }
 365                         else
 366                         {
 367                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a link block missing recvpass, sendpass, port or ipaddr.");
 368                         }
 369
 370                         /* Invalid link block */
 371                         continue;
 372                 }
 373
 374                 ValidIPs.push_back(L->IPAddr);
 375
 376                 if (L->AllowMask.length())
 377                         ValidIPs.push_back(L->AllowMask);
 378
 379                 /* Needs resolving */
 380                 bool ipvalid = true;
 381                 QueryType start_type = DNS_QUERY_A;
 382 #ifdef IPV6
 383                 start_type = DNS_QUERY_AAAA;
 384                 if (strchr(L->IPAddr.c_str(),':'))
 385                 {
 386                         in6_addr n;
 387                         if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 388                                 ipvalid = false;
 389                 }
 390                 else
 391 #endif
 392                 {
 393                         in_addr n;
 394                         if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 395                                 ipvalid = false;
 396                 }
 397
 398                 if (!ipvalid)
 399                 {
 400                         try
 401                         {
 402                                 bool cached;
 403                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 404                                 ServerInstance->AddResolver(sr, cached);
 405                         }
 406                         catch (...)
 407                         {
 408                         }
 409                 }
 410         }
 411 }
 412
 413 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 414 {
 415         ConfigReader* Conf = new ConfigReader(ServerInstance);
 416         if (rebind)
 417         {
 418                 for (unsigned int i = 0; i < Bindings.size(); i++)
 419                 {
 420                         ServerInstance->SE->DelFd(Bindings[i]);
 421                         Bindings[i]->Close();
 422                 }
 423                 ServerInstance->BufferedSocketCull();
 424                 Bindings.clear();
 425
 426                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 427                 {
 428                         std::string Type = Conf->ReadValue("bind","type",j);
 429                         std::string IP = Conf->ReadValue("bind","address",j);
 430                         std::string Port = Conf->ReadValue("bind","port",j);
 431                         std::string transport = Conf->ReadValue("bind","transport",j);
 432                         if (Type == "servers")
 433                         {
 434                                 irc::portparser portrange(Port, false);
 435                                 int portno = -1;
 436
 437                                 if (IP == "*")
 438                                         IP.clear();
 439
 440                                 while ((portno = portrange.GetToken()))
 441                                 {
 442                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 443                                         {
 444                                                 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?");
 445                                                 break;
 446                                         }
 447
 448                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 449                                         if (listener->GetState() == I_LISTENING)
 450                                         {
 451                                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 452                                                 Bindings.push_back(listener);
 453                                         }
 454                                         else
 455                                         {
 456                                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 457                                                 listener->Close();
 458                                         }
 459                                 }
 460                         }
 461                 }
 462         }
 463         FlatLinks = Conf->ReadFlag("security","flatlinks",0);
 464         HideULines = Conf->ReadFlag("security","hideulines",0);
 465         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 466         ChallengeResponse = !Conf->ReadFlag("security", "disablehmac", 0);
 467         quiet_bursts = Conf->ReadFlag("performance", "quietbursts", 0);
 468         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 469         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 470
 471         if (PingFreq == 0)
 472                 PingFreq = 60;
 473
 474         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 475                 PingWarnTime = 0;
 476
 477         LinkBlocks.clear();
 478         ValidIPs.clear();
 479         for (int j = 0; j < Conf->Enumerate("link"); j++)
 480         {
 481                 Link L;
 482                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 483                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 484                 L.AllowMask = Allow;
 485                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 486                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 487                 L.Port = Conf->ReadInteger("link", "port", j, true);
 488                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 489                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 490                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 491                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 492                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 493                 L.Hook = Conf->ReadValue("link", "transport", j);
 494                 L.Bind = Conf->ReadValue("link", "bind", j);
 495                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 496
 497                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 498                 {
 499                         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.");
 500                         continue;
 501
 502                 }
 503
 504                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 505                 /* Bugfix by brain, do not allow people to enter bad configurations */
 506                 if (L.Name != ServerInstance->Config->ServerName)
 507                 {
 508                         if (L.Name.find('.') == std::string::npos)
 509                                 throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 510
 511                         if (L.Name.length() > 64)
 512                                 throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 513
 514                         if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 515                         {
 516                                 if (Allow.length())
 517                                         ValidIPs.push_back(Allow);
 518
 519                                 ValidIPs.push_back(L.IPAddr);
 520
 521                                 /* Needs resolving */
 522                                 bool ipvalid = true;
 523                                 QueryType start_type = DNS_QUERY_A;
 524 #ifdef IPV6
 525                                 start_type = DNS_QUERY_AAAA;
 526                                 if (strchr(L.IPAddr.c_str(),':'))
 527                                 {
 528                                         in6_addr n;
 529                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 530                                                 ipvalid = false;
 531                                 }
 532                                 else
 533                                 {
 534                                         in_addr n;
 535                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 536                                                 ipvalid = false;
 537                                 }
 538 #else
 539                                 in_addr n;
 540                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 541                                         ipvalid = false;
 542 #endif
 543
 544                                 if (!ipvalid)
 545                                 {
 546                                         try
 547                                         {
 548                                                 bool cached;
 549                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 550                                                 ServerInstance->AddResolver(sr, cached);
 551                                         }
 552                                         catch (...)
 553                                         {
 554                                         }
 555                                 }
 556                         }
 557                         else
 558                         {
 559                                 if (L.IPAddr.empty())
 560                                 {
 561                                         L.IPAddr = "*";
 562                                         ValidIPs.push_back("*");
 563                                         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.");
 564                                 }
 565
 566                                 if (L.RecvPass.empty())
 567                                 {
 568                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 569                                 }
 570
 571                                 if (L.SendPass.empty())
 572                                 {
 573                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 574                                 }
 575
 576                                 if (L.Name.empty())
 577                                 {
 578                                         throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 579                                 }
 580
 581                                 if (!L.Port)
 582                                 {
 583                                         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.");
 584                                 }
 585                         }
 586
 587
 588                         LinkBlocks.push_back(L);
 589                 }
 590                 else
 591                 {
 592                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', link tag has the same server name as the local server!");
 593                 }
 594         }
 595         delete Conf;
 596 }
 597
 598 void SpanningTreeUtilities::DoFailOver(Link* x)
 599 {
 600         if (x->FailOver.length())
 601         {
 602                 if (x->FailOver == x->Name)
 603                 {
 604                         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());
 605                         return;
 606                 }
 607                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 608                 if (TryThisOne)
 609                 {
 610                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 611                         if (CheckDupe)
 612                         {
 613                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 614                         }
 615                         else
 616                         {
 617                                 Creator->RemoteMessage(NULL,"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 618                                 Creator->ConnectServer(TryThisOne);
 619                         }
 620                 }
 621                 else
 622                 {
 623                         Creator->RemoteMessage(NULL,"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 624                 }
 625         }
 626 }
 627
 628 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 629 {
 630         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 631         {
 632                 if (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 633                 {
 634                         return &(*x);
 635                 }
 636         }
 637         return NULL;
 638 }