src/modules/m_spanningtree/utils.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 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 "configreader.h"
  15 #include "users.h"
  16 #include "channels.h"
  17 #include "modules.h"
  18 #include "commands/cmd_whois.h"
  19 #include "commands/cmd_stats.h"
  20 #include "socket.h"
  21 #include "inspircd.h"
  22 #include "wildcard.h"
  23 #include "xline.h"
  24 #include "transport.h"
  25 #include "socketengine.h"
  26
  27 #include "m_spanningtree/main.h"
  28 #include "m_spanningtree/utils.h"
  29 #include "m_spanningtree/treeserver.h"
  30 #include "m_spanningtree/link.h"
  31 #include "m_spanningtree/treesocket.h"
  32 #include "m_spanningtree/resolvers.h"
  33
  34 /* $ModDep: m_spanningtree/timesynctimer.h m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h */
  35
  36 /** Yay for fast searches!
  37  * This is hundreds of times faster than recursion
  38  * or even scanning a linked list, especially when
  39  * there are more than a few servers to deal with.
  40  * (read as: lots).
  41  */
  42 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  43 {
  44         server_hash::iterator iter;
  45         iter = serverlist.find(ServerName.c_str());
  46         if (iter != serverlist.end())
  47         {
  48                 return iter->second;
  49         }
  50         else
  51         {
  52                 return NULL;
  53         }
  54 }
  55
  56 TreeServer* SpanningTreeUtilities::FindRemoteBurstServer(TreeServer* Server)
  57 {
  58         server_hash::iterator iter;
  59         iter = RemoteServersBursting.find(Server->GetName().c_str());
  60         if (iter != RemoteServersBursting.end())
  61                 return iter->second;
  62         else
  63                 return NULL;
  64 }
  65
  66 TreeSocket* SpanningTreeUtilities::FindBurstingServer(const std::string &ServerName)
  67 {
  68         std::map<irc::string,TreeSocket*>::iterator iter;
  69         iter = burstingserverlist.find(ServerName.c_str());
  70         if (iter != burstingserverlist.end())
  71         {
  72                 return iter->second;
  73         }
  74         else
  75         {
  76                 return NULL;
  77         }
  78 }
  79
  80 void SpanningTreeUtilities::SetRemoteBursting(TreeServer* Server, bool bursting)
  81 {
  82         ServerInstance->Log(DEBUG,"Server %s is %sbursting nicknames", Server->GetName().c_str(), bursting ? "" : "no longer ");
  83         server_hash::iterator iter;
  84         iter = RemoteServersBursting.find(Server->GetName().c_str());
  85         if (bursting)
  86         {
  87                 if (iter == RemoteServersBursting.end())
  88                         RemoteServersBursting.erase(iter);
  89         }
  90         else
  91         {
  92                 if (iter != RemoteServersBursting.end())
  93                         RemoteServersBursting.insert(make_pair(Server->GetName(), Server));
  94         }
  95 }
  96
  97 void SpanningTreeUtilities::AddBurstingServer(const std::string &ServerName, TreeSocket* s)
  98 {
  99         std::map<irc::string,TreeSocket*>::iterator iter;
 100         iter = burstingserverlist.find(ServerName.c_str());
 101         if (iter == burstingserverlist.end())
 102                 burstingserverlist[ServerName.c_str()] = s;
 103 }
 104
 105 void SpanningTreeUtilities::DelBurstingServer(TreeSocket* s)
 106 {
 107          for (std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.begin(); iter != burstingserverlist.end(); iter++)
 108          {
 109                  if (iter->second == s)
 110                  {
 111                          burstingserverlist.erase(iter);
 112                          return;
 113                  }
 114          }
 115 }
 116
 117 /** Returns the locally connected server we must route a
 118  * message through to reach server 'ServerName'. This
 119  * only applies to one-to-one and not one-to-many routing.
 120  * See the comments for the constructor of TreeServer
 121  * for more details.
 122  */
 123 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
 124 {
 125         if (ServerName.c_str() == TreeRoot->GetName())
 126                 return NULL;
 127         TreeServer* Found = FindServer(ServerName);
 128         if (Found)
 129         {
 130                 return Found->GetRoute();
 131         }
 132         else
 133         {
 134                 return NULL;
 135         }
 136 }
 137
 138 /** Find the first server matching a given glob mask.
 139  * Theres no find-using-glob method of hash_map [awwww :-(]
 140  * so instead, we iterate over the list using an iterator
 141  * and match each one until we get a hit. Yes its slow,
 142  * deal with it.
 143  */
 144 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 145 {
 146         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 147         {
 148                 if (match(i->first.c_str(),ServerName.c_str()))
 149                         return i->second;
 150         }
 151         return NULL;
 152 }
 153
 154 /* A convenient wrapper that returns true if a server exists */
 155 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 156 {
 157         return (FindServer(ServerName) != NULL);
 158 }
 159
 160 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 161 {
 162         Bindings.clear();
 163
 164         lines_to_apply = 0;
 165
 166         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc);
 167
 168         modulelist* ml = ServerInstance->FindInterface("InspSocketHook");
 169
 170         /* Did we find any modules? */
 171         if (ml)
 172         {
 173                 /* Yes, enumerate them all to find out the hook name */
 174                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 175                 {
 176                         /* Make a request to it for its name, its implementing
 177                          * InspSocketHook so we know its safe to do this
 178                          */
 179                         std::string name = InspSocketNameRequest((Module*)Creator, *m).Send();
 180                         /* Build a map of them */
 181                         hooks[name.c_str()] = *m;
 182                         hooknames.push_back(name);
 183                 }
 184         }
 185
 186         this->ReadConfiguration(true);
 187 }
 188
 189 SpanningTreeUtilities::~SpanningTreeUtilities()
 190 {
 191         for (unsigned int i = 0; i < Bindings.size(); i++)
 192         {
 193                 ServerInstance->SE->DelFd(Bindings[i]);
 194                 Bindings[i]->Close();
 195                 DELETE(Bindings[i]);
 196         }
 197         while (TreeRoot->ChildCount())
 198         {
 199                 TreeServer* child_server = TreeRoot->GetChild(0);
 200                 if (child_server)
 201                 {
 202                         TreeSocket* sock = child_server->GetSocket();
 203                         ServerInstance->SE->DelFd(sock);
 204                         sock->Close();
 205                         DELETE(sock);
 206                 }
 207         }
 208         delete TreeRoot;
 209 }
 210
 211 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 212 {
 213         if (list.find(server) == list.end())
 214                 list[server] = server;
 215 }
 216
 217 /* returns a list of DIRECT servernames for a specific channel */
 218 void SpanningTreeUtilities::GetListOfServersForChannel(chanrec* c, TreeServerList &list, char status, const CUList &exempt_list)
 219 {
 220         CUList *ulist;
 221         switch (status)
 222         {
 223                 case '@':
 224                         ulist = c->GetOppedUsers();
 225                 break;
 226                 case '%':
 227                         ulist = c->GetHalfoppedUsers();
 228                 break;
 229                 case '+':
 230                         ulist = c->GetVoicedUsers();
 231                 break;
 232                 default:
 233                         ulist = c->GetUsers();
 234                 break;
 235         }
 236         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 237         {
 238                 if ((i->first->GetFd() < 0) && (exempt_list.find(i->first) == exempt_list.end()))
 239                 {
 240                         TreeServer* best = this->BestRouteTo(i->first->server);
 241                         if (best)
 242                                 AddThisServer(best,list);
 243                 }
 244         }
 245         return;
 246 }
 247
 248 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 249 {
 250         char pfx = 0;
 251         TreeServer* omitroute = this->BestRouteTo(omit);
 252         if ((command == "NOTICE") || (command == "PRIVMSG"))
 253         {
 254                 if (params.size() >= 2)
 255                 {
 256                         /* Prefixes */
 257                         if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
 258                         {
 259                                 pfx = params[0][0];
 260                                 params[0] = params[0].substr(1, params[0].length()-1);
 261                         }
 262                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 263                         {
 264                                 // special routing for private messages/notices
 265                                 userrec* d = ServerInstance->FindNick(params[0]);
 266                                 if (d)
 267                                 {
 268                                         std::deque<std::string> par;
 269                                         par.push_back(params[0]);
 270                                         par.push_back(":"+params[1]);
 271                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 272                                         return true;
 273                                 }
 274                         }
 275                         else if (*(params[0].c_str()) == '$')
 276                         {
 277                                 std::deque<std::string> par;
 278                                 par.push_back(params[0]);
 279                                 par.push_back(":"+params[1]);
 280                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 281                                 return true;
 282                         }
 283                         else
 284                         {
 285                                 chanrec* c = ServerInstance->FindChan(params[0]);
 286                                 userrec* u = ServerInstance->FindNick(prefix);
 287                                 if (c && u)
 288                                 {
 289                                         CUList elist;
 290                                         TreeServerList list;
 291                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist));
 292                                         GetListOfServersForChannel(c,list,pfx,elist);
 293
 294                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 295                                         {
 296                                                 TreeSocket* Sock = i->second->GetSocket();
 297                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 298                                                 {
 299                                                         Sock->WriteLine(data);
 300                                                 }
 301                                         }
 302                                         return true;
 303                                 }
 304                         }
 305                 }
 306         }
 307         unsigned int items =this->TreeRoot->ChildCount();
 308         for (unsigned int x = 0; x < items; x++)
 309         {
 310                 TreeServer* Route = this->TreeRoot->GetChild(x);
 311                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 312                 {
 313                         TreeSocket* Sock = Route->GetSocket();
 314                         if (Sock)
 315                                 Sock->WriteLine(data);
 316                 }
 317         }
 318         return true;
 319 }
 320
 321 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 322 {
 323         TreeServer* omitroute = this->BestRouteTo(omit);
 324         std::string FullLine = ":" + prefix + " " + command;
 325         unsigned int words = params.size();
 326         for (unsigned int x = 0; x < words; x++)
 327         {
 328                 FullLine = FullLine + " " + params[x];
 329         }
 330         unsigned int items = this->TreeRoot->ChildCount();
 331         for (unsigned int x = 0; x < items; x++)
 332         {
 333                 TreeServer* Route = this->TreeRoot->GetChild(x);
 334                 // Send the line IF:
 335                 // The route has a socket (its a direct connection)
 336                 // The route isnt the one to be omitted
 337                 // The route isnt the path to the one to be omitted
 338                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 339                 {
 340                         TreeSocket* Sock = Route->GetSocket();
 341                         if (Sock)
 342                                 Sock->WriteLine(FullLine);
 343                 }
 344         }
 345         return true;
 346 }
 347
 348 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 349 {
 350         std::string FullLine = ":" + prefix + " " + command;
 351         unsigned int words = params.size();
 352         for (unsigned int x = 0; x < words; x++)
 353         {
 354                 FullLine = FullLine + " " + params[x];
 355         }
 356         unsigned int items = this->TreeRoot->ChildCount();
 357         for (unsigned int x = 0; x < items; x++)
 358         {
 359                 TreeServer* Route = this->TreeRoot->GetChild(x);
 360                 if (Route && Route->GetSocket())
 361                 {
 362                         TreeSocket* Sock = Route->GetSocket();
 363                         if (Sock)
 364                                 Sock->WriteLine(FullLine);
 365                 }
 366         }
 367         return true;
 368 }
 369
 370 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 371 {
 372         std::string spfx = prefix;
 373         std::string scmd = command;
 374         return this->DoOneToMany(spfx, scmd, params);
 375 }
 376
 377 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 378 {
 379         std::string spfx = prefix;
 380         std::string scmd = command;
 381         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 382 }
 383
 384 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 385 {
 386         TreeServer* Route = this->BestRouteTo(target);
 387         if (Route)
 388         {
 389                 std::string FullLine = ":" + prefix + " " + command;
 390                 unsigned int words = params.size();
 391                 for (unsigned int x = 0; x < words; x++)
 392                 {
 393                         FullLine = FullLine + " " + params[x];
 394                 }
 395                 if (Route && Route->GetSocket())
 396                 {
 397                         TreeSocket* Sock = Route->GetSocket();
 398                         if (Sock)
 399                                 Sock->WriteLine(FullLine);
 400                 }
 401                 return true;
 402         }
 403         else
 404         {
 405                 return false;
 406         }
 407 }
 408
 409 void SpanningTreeUtilities::RefreshIPCache()
 410 {
 411         ValidIPs.clear();
 412         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 413         {
 414                 if ((L->IPAddr != "") && (L->RecvPass != "") && (L->SendPass != "") && (L->Name != "") && (L->Port))
 415                 {
 416                         ValidIPs.push_back(L->IPAddr);
 417
 418                         if (L->AllowMask.length())
 419                                 ValidIPs.push_back(L->AllowMask);
 420
 421                         /* Needs resolving */
 422                         bool ipvalid = true;
 423                         QueryType start_type = DNS_QUERY_A;
 424 #ifdef IPV6
 425                         start_type = DNS_QUERY_AAAA;
 426                         if (strchr(L->IPAddr.c_str(),':'))
 427                         {
 428                                 in6_addr n;
 429                                 if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 430                                         ipvalid = false;
 431                         }
 432                         else
 433                         {
 434                                 in_addr n;
 435                                 if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 436                                         ipvalid = false;
 437                         }
 438 #else
 439                         in_addr n;
 440                         if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 441                                 ipvalid = false;
 442 #endif
 443                         if (!ipvalid)
 444                         {
 445                                 try
 446                                 {
 447                                         bool cached;
 448                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 449                                         ServerInstance->AddResolver(sr, cached);
 450                                 }
 451                                 catch (ModuleException& e)
 452                                 {
 453                                 }
 454                         }
 455                 }
 456         }
 457 }
 458
 459 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 460 {
 461         ConfigReader* Conf = new ConfigReader(ServerInstance);
 462         if (rebind)
 463         {
 464                 for (int j =0; j < Conf->Enumerate("bind"); j++)
 465                 {
 466                         std::string Type = Conf->ReadValue("bind","type",j);
 467                         std::string IP = Conf->ReadValue("bind","address",j);
 468                         std::string Port = Conf->ReadValue("bind","port",j);
 469                         std::string transport = Conf->ReadValue("bind","transport",j);
 470                         if (Type == "servers")
 471                         {
 472                                 irc::portparser portrange(Port, false);
 473                                 int portno = -1;
 474                                 while ((portno = portrange.GetToken()))
 475                                 {
 476                                         if (IP == "*")
 477                                                 IP = "";
 478
 479                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 480                                         {
 481                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: WARNING: Can't find transport type '%s' for port %s:%s - maybe you forgot to load it BEFORE m_spanningtree in your config file? - Skipping this port binding", transport.c_str(), IP.c_str(), Port.c_str());
 482                                                 break;
 483                                         }
 484
 485                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 486                                         if (listener->GetState() == I_LISTENING)
 487                                         {
 488                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 489                                                 Bindings.push_back(listener);
 490                                         }
 491                                         else
 492                                         {
 493                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 494                                                 listener->Close();
 495                                                 DELETE(listener);
 496                                         }
 497                                 }
 498                         }
 499                 }
 500         }
 501         FlatLinks = Conf->ReadFlag("options","flatlinks",0);
 502         HideULines = Conf->ReadFlag("options","hideulines",0);
 503         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 504         EnableTimeSync = Conf->ReadFlag("timesync","enable",0);
 505         MasterTime = Conf->ReadFlag("timesync", "master", 0);
 506         ChallengeResponse = !Conf->ReadFlag("options", "disablehmac", 0);
 507         quiet_bursts = Conf->ReadFlag("options", "quietbursts", 0);
 508         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 509
 510         if (PingWarnTime < 0 || PingWarnTime > 59)
 511                 PingWarnTime = 0;
 512
 513         LinkBlocks.clear();
 514         ValidIPs.clear();
 515         for (int j =0; j < Conf->Enumerate("link"); j++)
 516         {
 517                 Link L;
 518                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 519                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 520                 L.AllowMask = Allow;
 521                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 522                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 523                 L.Port = Conf->ReadInteger("link", "port", j, true);
 524                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 525                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 526                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 527                 L.HiddenFromStats = Conf->ReadFlag("link", "hidden", j);
 528                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 529                 L.Hook = Conf->ReadValue("link", "transport", j);
 530                 L.Bind = Conf->ReadValue("link", "bind", j);
 531                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 532
 533                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 534                 {
 535                         ServerInstance->Log(DEFAULT,"m_spanningtree: WARNING: Can't find transport type '%s' for link '%s' - maybe you forgot to load it BEFORE m_spanningtree in your config file? Skipping <link> tag completely.",
 536                         L.Hook.c_str(), L.Name.c_str());
 537                         continue;
 538
 539                 }
 540
 541                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 542                 /* Bugfix by brain, do not allow people to enter bad configurations */
 543                 if (L.Name != ServerInstance->Config->ServerName)
 544                 {
 545                         if ((L.IPAddr != "") && (L.RecvPass != "") && (L.SendPass != "") && (L.Name != "") && (L.Port))
 546                         {
 547                                 ValidIPs.push_back(L.IPAddr);
 548
 549                                 if (Allow.length())
 550                                         ValidIPs.push_back(Allow);
 551
 552                                 /* Needs resolving */
 553                                 bool ipvalid = true;
 554                                 QueryType start_type = DNS_QUERY_A;
 555 #ifdef IPV6
 556                                 start_type = DNS_QUERY_AAAA;
 557                                 if (strchr(L.IPAddr.c_str(),':'))
 558                                 {
 559                                         in6_addr n;
 560                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 561                                                 ipvalid = false;
 562                                 }
 563                                 else
 564                                 {
 565                                         in_addr n;
 566                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 567                                                 ipvalid = false;
 568                                 }
 569 #else
 570                                 in_addr n;
 571                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 572                                         ipvalid = false;
 573 #endif
 574
 575                                 if (!ipvalid)
 576                                 {
 577                                         try
 578                                         {
 579                                                 bool cached;
 580                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 581                                                 ServerInstance->AddResolver(sr, cached);
 582                                         }
 583                                         catch (ModuleException& e)
 584                                         {
 585                                         }
 586                                 }
 587
 588                                 LinkBlocks.push_back(L);
 589                         }
 590                         else
 591                         {
 592                                 if (L.IPAddr == "")
 593                                 {
 594                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', IP address not defined!",L.Name.c_str());
 595                                 }
 596                                 else if (L.RecvPass == "")
 597                                 {
 598                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', recvpass not defined!",L.Name.c_str());
 599                                 }
 600                                 else if (L.SendPass == "")
 601                                 {
 602                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', sendpass not defined!",L.Name.c_str());
 603                                 }
 604                                 else if (L.Name == "")
 605                                 {
 606                                         ServerInstance->Log(DEFAULT,"Invalid configuration, link tag without a name!");
 607                                 }
 608                                 else if (!L.Port)
 609                                 {
 610                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', no port specified!",L.Name.c_str());
 611                                 }
 612                         }
 613                 }
 614                 else
 615                 {
 616                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', link tag has the same server name as the local server!",L.Name.c_str());
 617                 }
 618         }
 619         DELETE(Conf);
 620 }
 621
 622 void SpanningTreeUtilities::DoFailOver(Link* x)
 623 {
 624         if (x->FailOver.length())
 625         {
 626                 if (x->FailOver == x->Name)
 627                 {
 628                         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());
 629                         return;
 630                 }
 631                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 632                 if (TryThisOne)
 633                 {
 634                         ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 635                         Creator->ConnectServer(TryThisOne);
 636                 }
 637                 else
 638                 {
 639                         ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 640                 }
 641         }
 642 }
 643
 644 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 645 {
 646         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 647         {
 648                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
 649                 {
 650                         return &(*x);
 651                 }
 652         }
 653         return NULL;
 654 }
 655