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 "inspircd.h"
  15 #include "configreader.h"
  16 #include "users.h"
  17 #include "channels.h"
  18 #include "modules.h"
  19 #include "commands/cmd_whois.h"
  20 #include "commands/cmd_stats.h"
  21 #include "socket.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 = serverlist.find(ServerName.c_str());
  45         if (iter != serverlist.end())
  46         {
  47                 return iter->second;
  48         }
  49         else
  50         {
  51                 return NULL;
  52         }
  53 }
  54
  55 TreeServer* SpanningTreeUtilities::FindRemoteBurstServer(TreeServer* Server)
  56 {
  57         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  58         if (iter != RemoteServersBursting.end())
  59                 return iter->second;
  60         else
  61                 return NULL;
  62 }
  63
  64 TreeSocket* SpanningTreeUtilities::FindBurstingServer(const std::string &ServerName)
  65 {
  66         std::map<irc::string,TreeSocket*>::iterator iter;
  67         iter = burstingserverlist.find(ServerName.c_str());
  68         if (iter != burstingserverlist.end())
  69         {
  70                 return iter->second;
  71         }
  72         else
  73         {
  74                 return NULL;
  75         }
  76 }
  77
  78 void SpanningTreeUtilities::SetRemoteBursting(TreeServer* Server, bool bursting)
  79 {
  80         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  81         if (bursting)
  82         {
  83                 if (iter == RemoteServersBursting.end())
  84                         RemoteServersBursting.insert(make_pair(Server->GetName(), Server));
  85                 else return;
  86         }
  87         else
  88         {
  89                 if (iter != RemoteServersBursting.end())
  90                         RemoteServersBursting.erase(iter);
  91                 else return;
  92         }
  93         ServerInstance->Log(DEBUG,"Server %s is %sbursting nicknames", Server->GetName().c_str(), bursting ? "" : "no longer ");
  94 }
  95
  96 void SpanningTreeUtilities::AddBurstingServer(const std::string &ServerName, TreeSocket* s)
  97 {
  98         std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.find(ServerName.c_str());
  99         if (iter == burstingserverlist.end())
 100                 burstingserverlist[ServerName.c_str()] = s;
 101 }
 102
 103 void SpanningTreeUtilities::DelBurstingServer(TreeSocket* s)
 104 {
 105          for (std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.begin(); iter != burstingserverlist.end(); iter++)
 106          {
 107                  if (iter->second == s)
 108                  {
 109                          burstingserverlist.erase(iter);
 110                          return;
 111                  }
 112          }
 113 }
 114
 115 /** Returns the locally connected server we must route a
 116  * message through to reach server 'ServerName'. This
 117  * only applies to one-to-one and not one-to-many routing.
 118  * See the comments for the constructor of TreeServer
 119  * for more details.
 120  */
 121 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
 122 {
 123         if (ServerName.c_str() == TreeRoot->GetName())
 124                 return NULL;
 125         TreeServer* Found = FindServer(ServerName);
 126         if (Found)
 127         {
 128                 return Found->GetRoute();
 129         }
 130         else
 131         {
 132                 return NULL;
 133         }
 134 }
 135
 136 /** Find the first server matching a given glob mask.
 137  * Theres no find-using-glob method of hash_map [awwww :-(]
 138  * so instead, we iterate over the list using an iterator
 139  * and match each one until we get a hit. Yes its slow,
 140  * deal with it.
 141  */
 142 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 143 {
 144         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 145         {
 146                 if (match(i->first.c_str(),ServerName.c_str()))
 147                         return i->second;
 148         }
 149         return NULL;
 150 }
 151
 152 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 153 {
 154         server_hash::iterator iter = sidlist.find(id);
 155         if (iter != sidlist.end())
 156                 return iter->second;
 157         else
 158                 return NULL;
 159 }
 160
 161 /* A convenient wrapper that returns true if a server exists */
 162 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 163 {
 164         return (FindServer(ServerName) != NULL);
 165 }
 166
 167 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 168 {
 169         Bindings.clear();
 170
 171         lines_to_apply = 0;
 172
 173         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc);
 174
 175         modulelist* ml = ServerInstance->FindInterface("InspSocketHook");
 176
 177         /* Did we find any modules? */
 178         if (ml)
 179         {
 180                 /* Yes, enumerate them all to find out the hook name */
 181                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 182                 {
 183                         /* Make a request to it for its name, its implementing
 184                          * InspSocketHook so we know its safe to do this
 185                          */
 186                         std::string name = InspSocketNameRequest((Module*)Creator, *m).Send();
 187                         /* Build a map of them */
 188                         hooks[name.c_str()] = *m;
 189                         hooknames.push_back(name);
 190                 }
 191         }
 192
 193         this->ReadConfiguration(true);
 194 }
 195
 196 SpanningTreeUtilities::~SpanningTreeUtilities()
 197 {
 198         for (unsigned int i = 0; i < Bindings.size(); i++)
 199         {
 200                 ServerInstance->SE->DelFd(Bindings[i]);
 201                 Bindings[i]->Close();
 202         }
 203         while (TreeRoot->ChildCount())
 204         {
 205                 TreeServer* child_server = TreeRoot->GetChild(0);
 206                 if (child_server)
 207                 {
 208                         TreeSocket* sock = child_server->GetSocket();
 209                         ServerInstance->SE->DelFd(sock);
 210                         sock->Close();
 211                 }
 212         }
 213         delete TreeRoot;
 214         ServerInstance->InspSocketCull();
 215 }
 216
 217 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 218 {
 219         if (list.find(server) == list.end())
 220                 list[server] = server;
 221 }
 222
 223 /* returns a list of DIRECT servernames for a specific channel */
 224 void SpanningTreeUtilities::GetListOfServersForChannel(chanrec* c, TreeServerList &list, char status, const CUList &exempt_list)
 225 {
 226         CUList *ulist;
 227         switch (status)
 228         {
 229                 case '@':
 230                         ulist = c->GetOppedUsers();
 231                 break;
 232                 case '%':
 233                         ulist = c->GetHalfoppedUsers();
 234                 break;
 235                 case '+':
 236                         ulist = c->GetVoicedUsers();
 237                 break;
 238                 default:
 239                         ulist = c->GetUsers();
 240                 break;
 241         }
 242         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 243         {
 244                 if ((i->first->GetFd() < 0) && (exempt_list.find(i->first) == exempt_list.end()))
 245                 {
 246                         TreeServer* best = this->BestRouteTo(i->first->server);
 247                         if (best)
 248                                 AddThisServer(best,list);
 249                 }
 250         }
 251         return;
 252 }
 253
 254 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 255 {
 256         char pfx = 0;
 257         TreeServer* omitroute = this->BestRouteTo(omit);
 258         if ((command == "NOTICE") || (command == "PRIVMSG"))
 259         {
 260                 if (params.size() >= 2)
 261                 {
 262                         /* Prefixes */
 263                         if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
 264                         {
 265                                 pfx = params[0][0];
 266                                 params[0] = params[0].substr(1, params[0].length()-1);
 267                         }
 268                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 269                         {
 270                                 // special routing for private messages/notices
 271                                 userrec* d = ServerInstance->FindNick(params[0]);
 272                                 if (d)
 273                                 {
 274                                         std::deque<std::string> par;
 275                                         par.push_back(params[0]);
 276                                         par.push_back(":"+params[1]);
 277                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 278                                         return true;
 279                                 }
 280                         }
 281                         else if (*(params[0].c_str()) == '$')
 282                         {
 283                                 std::deque<std::string> par;
 284                                 par.push_back(params[0]);
 285                                 par.push_back(":"+params[1]);
 286                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 287                                 return true;
 288                         }
 289                         else
 290                         {
 291                                 chanrec* c = ServerInstance->FindChan(params[0]);
 292                                 userrec* u = ServerInstance->FindNick(prefix);
 293                                 if (c && u)
 294                                 {
 295                                         CUList elist;
 296                                         TreeServerList list;
 297                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist));
 298                                         GetListOfServersForChannel(c,list,pfx,elist);
 299
 300                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 301                                         {
 302                                                 TreeSocket* Sock = i->second->GetSocket();
 303                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 304                                                 {
 305                                                         Sock->WriteLine(data);
 306                                                 }
 307                                         }
 308                                         return true;
 309                                 }
 310                         }
 311                 }
 312         }
 313         unsigned int items =this->TreeRoot->ChildCount();
 314         for (unsigned int x = 0; x < items; x++)
 315         {
 316                 TreeServer* Route = this->TreeRoot->GetChild(x);
 317                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 318                 {
 319                         TreeSocket* Sock = Route->GetSocket();
 320                         if (Sock)
 321                                 Sock->WriteLine(data);
 322                 }
 323         }
 324         return true;
 325 }
 326
 327 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 328 {
 329         TreeServer* omitroute = this->BestRouteTo(omit);
 330         std::string FullLine = ":" + prefix + " " + command;
 331         unsigned int words = params.size();
 332         for (unsigned int x = 0; x < words; x++)
 333         {
 334                 FullLine = FullLine + " " + params[x];
 335         }
 336         unsigned int items = this->TreeRoot->ChildCount();
 337         for (unsigned int x = 0; x < items; x++)
 338         {
 339                 TreeServer* Route = this->TreeRoot->GetChild(x);
 340                 // Send the line IF:
 341                 // The route has a socket (its a direct connection)
 342                 // The route isnt the one to be omitted
 343                 // The route isnt the path to the one to be omitted
 344                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 345                 {
 346                         TreeSocket* Sock = Route->GetSocket();
 347                         if (Sock)
 348                                 Sock->WriteLine(FullLine);
 349                 }
 350         }
 351         return true;
 352 }
 353
 354 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 355 {
 356         std::string FullLine = ":" + prefix + " " + command;
 357         unsigned int words = params.size();
 358         for (unsigned int x = 0; x < words; x++)
 359         {
 360                 FullLine = FullLine + " " + params[x];
 361         }
 362         unsigned int items = this->TreeRoot->ChildCount();
 363         for (unsigned int x = 0; x < items; x++)
 364         {
 365                 TreeServer* Route = this->TreeRoot->GetChild(x);
 366                 if (Route && Route->GetSocket())
 367                 {
 368                         TreeSocket* Sock = Route->GetSocket();
 369                         if (Sock)
 370                                 Sock->WriteLine(FullLine);
 371                 }
 372         }
 373         return true;
 374 }
 375
 376 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 377 {
 378         std::string spfx = prefix;
 379         std::string scmd = command;
 380         return this->DoOneToMany(spfx, scmd, params);
 381 }
 382
 383 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 384 {
 385         std::string spfx = prefix;
 386         std::string scmd = command;
 387         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 388 }
 389
 390 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 391 {
 392         TreeServer* Route = this->BestRouteTo(target);
 393         if (Route)
 394         {
 395                 std::string FullLine = ":" + prefix + " " + command;
 396                 unsigned int words = params.size();
 397                 for (unsigned int x = 0; x < words; x++)
 398                 {
 399                         FullLine = FullLine + " " + params[x];
 400                 }
 401                 if (Route && Route->GetSocket())
 402                 {
 403                         TreeSocket* Sock = Route->GetSocket();
 404                         if (Sock)
 405                                 Sock->WriteLine(FullLine);
 406                 }
 407                 return true;
 408         }
 409         else
 410         {
 411                 return false;
 412         }
 413 }
 414
 415 void SpanningTreeUtilities::RefreshIPCache()
 416 {
 417         ValidIPs.clear();
 418         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 419         {
 420                 if ((!L->IPAddr.empty()) && (!L->RecvPass.empty()) && (!L->SendPass.empty()) && (!L->Name.empty()) && (L->Port))
 421                 {
 422                         ValidIPs.push_back(L->IPAddr);
 423
 424                         if (L->AllowMask.length())
 425                                 ValidIPs.push_back(L->AllowMask);
 426
 427                         /* Needs resolving */
 428                         bool ipvalid = true;
 429                         QueryType start_type = DNS_QUERY_A;
 430 #ifdef IPV6
 431                         start_type = DNS_QUERY_AAAA;
 432                         if (strchr(L->IPAddr.c_str(),':'))
 433                         {
 434                                 in6_addr n;
 435                                 if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 436                                         ipvalid = false;
 437                         }
 438                         else
 439 #endif
 440                         {
 441                                 in_addr n;
 442                                 if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 443                                         ipvalid = false;
 444                         }
 445                         if (!ipvalid)
 446                         {
 447                                 try
 448                                 {
 449                                         bool cached;
 450                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 451                                         ServerInstance->AddResolver(sr, cached);
 452                                 }
 453                                 catch (...)
 454                                 {
 455                                 }
 456                         }
 457                 }
 458         }
 459 }
 460
 461 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 462 {
 463         ConfigReader* Conf = new ConfigReader(ServerInstance);
 464         if (rebind)
 465         {
 466                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 467                 {
 468                         std::string Type = Conf->ReadValue("bind","type",j);
 469                         std::string IP = Conf->ReadValue("bind","address",j);
 470                         std::string Port = Conf->ReadValue("bind","port",j);
 471                         std::string transport = Conf->ReadValue("bind","transport",j);
 472                         if (Type == "servers")
 473                         {
 474                                 irc::portparser portrange(Port, false);
 475                                 int portno = -1;
 476                                 while ((portno = portrange.GetToken()))
 477                                 {
 478                                         if (IP == "*")
 479                                                 IP.clear();
 480
 481                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 482                                         {
 483                                                 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());
 484                                                 break;
 485                                         }
 486
 487                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 488                                         if (listener->GetState() == I_LISTENING)
 489                                         {
 490                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 491                                                 Bindings.push_back(listener);
 492                                         }
 493                                         else
 494                                         {
 495                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 496                                                 listener->Close();
 497                                         }
 498                                 }
 499                         }
 500                 }
 501         }
 502         FlatLinks = Conf->ReadFlag("options","flatlinks",0);
 503         HideULines = Conf->ReadFlag("options","hideulines",0);
 504         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 505         EnableTimeSync = Conf->ReadFlag("timesync","enable",0);
 506         MasterTime = Conf->ReadFlag("timesync", "master", 0);
 507         ChallengeResponse = !Conf->ReadFlag("options", "disablehmac", 0);
 508         quiet_bursts = Conf->ReadFlag("options", "quietbursts", 0);
 509         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 510         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 511
 512         if (PingFreq == 0)
 513                 PingFreq = 60;
 514
 515         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 516                 PingWarnTime = 0;
 517
 518         LinkBlocks.clear();
 519         ValidIPs.clear();
 520         for (int j = 0; j < Conf->Enumerate("link"); j++)
 521         {
 522                 Link L;
 523                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 524                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 525                 L.AllowMask = Allow;
 526                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 527                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 528                 L.Port = Conf->ReadInteger("link", "port", j, true);
 529                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 530                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 531                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 532                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 533                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 534                 L.Hook = Conf->ReadValue("link", "transport", j);
 535                 L.Bind = Conf->ReadValue("link", "bind", j);
 536                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 537
 538                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 539                 {
 540                         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.",
 541                         L.Hook.c_str(), L.Name.c_str());
 542                         continue;
 543
 544                 }
 545
 546                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 547                 /* Bugfix by brain, do not allow people to enter bad configurations */
 548                 if (L.Name != ServerInstance->Config->ServerName)
 549                 {
 550                         if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 551                         {
 552                                 ValidIPs.push_back(L.IPAddr);
 553
 554                                 if (Allow.length())
 555                                         ValidIPs.push_back(Allow);
 556
 557                                 /* Needs resolving */
 558                                 bool ipvalid = true;
 559                                 QueryType start_type = DNS_QUERY_A;
 560 #ifdef IPV6
 561                                 start_type = DNS_QUERY_AAAA;
 562                                 if (strchr(L.IPAddr.c_str(),':'))
 563                                 {
 564                                         in6_addr n;
 565                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 566                                                 ipvalid = false;
 567                                 }
 568                                 else
 569                                 {
 570                                         in_addr n;
 571                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 572                                                 ipvalid = false;
 573                                 }
 574 #else
 575                                 in_addr n;
 576                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 577                                         ipvalid = false;
 578 #endif
 579
 580                                 if (!ipvalid)
 581                                 {
 582                                         try
 583                                         {
 584                                                 bool cached;
 585                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 586                                                 ServerInstance->AddResolver(sr, cached);
 587                                         }
 588                                         catch (...)
 589                                         {
 590                                         }
 591                                 }
 592
 593                                 LinkBlocks.push_back(L);
 594                         }
 595                         else
 596                         {
 597                                 if (L.IPAddr.empty())
 598                                 {
 599                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', IP address not defined!",L.Name.c_str());
 600                                 }
 601                                 else if (L.RecvPass.empty())
 602                                 {
 603                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', recvpass not defined!",L.Name.c_str());
 604                                 }
 605                                 else if (L.SendPass.empty())
 606                                 {
 607                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', sendpass not defined!",L.Name.c_str());
 608                                 }
 609                                 else if (L.Name.empty())
 610                                 {
 611                                         ServerInstance->Log(DEFAULT,"Invalid configuration, link tag without a name!");
 612                                 }
 613                                 else if (!L.Port)
 614                                 {
 615                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', no port specified!",L.Name.c_str());
 616                                 }
 617                         }
 618                 }
 619                 else
 620                 {
 621                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', link tag has the same server name as the local server!",L.Name.c_str());
 622                 }
 623         }
 624         DELETE(Conf);
 625 }
 626
 627 void SpanningTreeUtilities::DoFailOver(Link* x)
 628 {
 629         if (x->FailOver.length())
 630         {
 631                 if (x->FailOver == x->Name)
 632                 {
 633                         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());
 634                         return;
 635                 }
 636                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 637                 if (TryThisOne)
 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                 else
 643                 {
 644                         Creator->RemoteMessage(NULL,"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 645                 }
 646         }
 647 }
 648
 649 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 650 {
 651         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 652         {
 653                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
 654                 {
 655                         return &(*x);
 656                 }
 657         }
 658         return NULL;
 659 }
 660