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         std::string OurSID;
 172
 173         OurSID += (char)((Instance->Config->sid / 100) + 48);
 174         OurSID += (char)((Instance->Config->sid / 10) % 10 + 48);
 175         OurSID += (char)(Instance->Config->sid % 10 + 48);
 176
 177         lines_to_apply = 0;
 178
 179         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, OurSID);
 180
 181         modulelist* ml = ServerInstance->FindInterface("InspSocketHook");
 182
 183         /* Did we find any modules? */
 184         if (ml)
 185         {
 186                 /* Yes, enumerate them all to find out the hook name */
 187                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 188                 {
 189                         /* Make a request to it for its name, its implementing
 190                          * InspSocketHook so we know its safe to do this
 191                          */
 192                         std::string name = InspSocketNameRequest((Module*)Creator, *m).Send();
 193                         /* Build a map of them */
 194                         hooks[name.c_str()] = *m;
 195                         hooknames.push_back(name);
 196                 }
 197         }
 198
 199         this->ReadConfiguration(true);
 200 }
 201
 202 SpanningTreeUtilities::~SpanningTreeUtilities()
 203 {
 204         for (unsigned int i = 0; i < Bindings.size(); i++)
 205         {
 206                 ServerInstance->SE->DelFd(Bindings[i]);
 207                 Bindings[i]->Close();
 208         }
 209         while (TreeRoot->ChildCount())
 210         {
 211                 TreeServer* child_server = TreeRoot->GetChild(0);
 212                 if (child_server)
 213                 {
 214                         TreeSocket* sock = child_server->GetSocket();
 215                         ServerInstance->SE->DelFd(sock);
 216                         sock->Close();
 217                 }
 218         }
 219         delete TreeRoot;
 220         ServerInstance->InspSocketCull();
 221 }
 222
 223 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 224 {
 225         if (list.find(server) == list.end())
 226                 list[server] = server;
 227 }
 228
 229 /* returns a list of DIRECT servernames for a specific channel */
 230 void SpanningTreeUtilities::GetListOfServersForChannel(chanrec* c, TreeServerList &list, char status, const CUList &exempt_list)
 231 {
 232         CUList *ulist;
 233         switch (status)
 234         {
 235                 case '@':
 236                         ulist = c->GetOppedUsers();
 237                 break;
 238                 case '%':
 239                         ulist = c->GetHalfoppedUsers();
 240                 break;
 241                 case '+':
 242                         ulist = c->GetVoicedUsers();
 243                 break;
 244                 default:
 245                         ulist = c->GetUsers();
 246                 break;
 247         }
 248         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 249         {
 250                 if ((i->first->GetFd() < 0) && (exempt_list.find(i->first) == exempt_list.end()))
 251                 {
 252                         TreeServer* best = this->BestRouteTo(i->first->server);
 253                         if (best)
 254                                 AddThisServer(best,list);
 255                 }
 256         }
 257         return;
 258 }
 259
 260 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 261 {
 262         char pfx = 0;
 263         TreeServer* omitroute = this->BestRouteTo(omit);
 264         if ((command == "NOTICE") || (command == "PRIVMSG"))
 265         {
 266                 if (params.size() >= 2)
 267                 {
 268                         /* Prefixes */
 269                         if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
 270                         {
 271                                 pfx = params[0][0];
 272                                 params[0] = params[0].substr(1, params[0].length()-1);
 273                         }
 274                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 275                         {
 276                                 // special routing for private messages/notices
 277                                 userrec* d = ServerInstance->FindNick(params[0]);
 278                                 if (d)
 279                                 {
 280                                         std::deque<std::string> par;
 281                                         par.push_back(params[0]);
 282                                         par.push_back(":"+params[1]);
 283                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 284                                         return true;
 285                                 }
 286                         }
 287                         else if (*(params[0].c_str()) == '$')
 288                         {
 289                                 std::deque<std::string> par;
 290                                 par.push_back(params[0]);
 291                                 par.push_back(":"+params[1]);
 292                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 293                                 return true;
 294                         }
 295                         else
 296                         {
 297                                 chanrec* c = ServerInstance->FindChan(params[0]);
 298                                 userrec* u = ServerInstance->FindNick(prefix);
 299                                 if (c && u)
 300                                 {
 301                                         CUList elist;
 302                                         TreeServerList list;
 303                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist));
 304                                         GetListOfServersForChannel(c,list,pfx,elist);
 305
 306                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 307                                         {
 308                                                 TreeSocket* Sock = i->second->GetSocket();
 309                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 310                                                 {
 311                                                         Sock->WriteLine(data);
 312                                                 }
 313                                         }
 314                                         return true;
 315                                 }
 316                         }
 317                 }
 318         }
 319         unsigned int items =this->TreeRoot->ChildCount();
 320         for (unsigned int x = 0; x < items; x++)
 321         {
 322                 TreeServer* Route = this->TreeRoot->GetChild(x);
 323                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 324                 {
 325                         TreeSocket* Sock = Route->GetSocket();
 326                         if (Sock)
 327                                 Sock->WriteLine(data);
 328                 }
 329         }
 330         return true;
 331 }
 332
 333 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 334 {
 335         TreeServer* omitroute = this->BestRouteTo(omit);
 336         std::string FullLine = ":" + prefix + " " + command;
 337         unsigned int words = params.size();
 338         for (unsigned int x = 0; x < words; x++)
 339         {
 340                 FullLine = FullLine + " " + params[x];
 341         }
 342         unsigned int items = this->TreeRoot->ChildCount();
 343         for (unsigned int x = 0; x < items; x++)
 344         {
 345                 TreeServer* Route = this->TreeRoot->GetChild(x);
 346                 // Send the line IF:
 347                 // The route has a socket (its a direct connection)
 348                 // The route isnt the one to be omitted
 349                 // The route isnt the path to the one to be omitted
 350                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 351                 {
 352                         TreeSocket* Sock = Route->GetSocket();
 353                         if (Sock)
 354                                 Sock->WriteLine(FullLine);
 355                 }
 356         }
 357         return true;
 358 }
 359
 360 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 361 {
 362         std::string FullLine = ":" + prefix + " " + command;
 363         unsigned int words = params.size();
 364         for (unsigned int x = 0; x < words; x++)
 365         {
 366                 FullLine = FullLine + " " + params[x];
 367         }
 368         unsigned int items = this->TreeRoot->ChildCount();
 369         for (unsigned int x = 0; x < items; x++)
 370         {
 371                 TreeServer* Route = this->TreeRoot->GetChild(x);
 372                 if (Route && Route->GetSocket())
 373                 {
 374                         TreeSocket* Sock = Route->GetSocket();
 375                         if (Sock)
 376                                 Sock->WriteLine(FullLine);
 377                 }
 378         }
 379         return true;
 380 }
 381
 382 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 383 {
 384         std::string spfx = prefix;
 385         std::string scmd = command;
 386         return this->DoOneToMany(spfx, scmd, params);
 387 }
 388
 389 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 390 {
 391         std::string spfx = prefix;
 392         std::string scmd = command;
 393         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 394 }
 395
 396 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 397 {
 398         TreeServer* Route = this->BestRouteTo(target);
 399         if (Route)
 400         {
 401                 std::string FullLine = ":" + prefix + " " + command;
 402                 unsigned int words = params.size();
 403                 for (unsigned int x = 0; x < words; x++)
 404                 {
 405                         FullLine = FullLine + " " + params[x];
 406                 }
 407                 if (Route && Route->GetSocket())
 408                 {
 409                         TreeSocket* Sock = Route->GetSocket();
 410                         if (Sock)
 411                                 Sock->WriteLine(FullLine);
 412                 }
 413                 return true;
 414         }
 415         else
 416         {
 417                 return false;
 418         }
 419 }
 420
 421 void SpanningTreeUtilities::RefreshIPCache()
 422 {
 423         ValidIPs.clear();
 424         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 425         {
 426                 if ((!L->IPAddr.empty()) && (!L->RecvPass.empty()) && (!L->SendPass.empty()) && (!L->Name.empty()) && (L->Port))
 427                 {
 428                         ValidIPs.push_back(L->IPAddr);
 429
 430                         if (L->AllowMask.length())
 431                                 ValidIPs.push_back(L->AllowMask);
 432
 433                         /* Needs resolving */
 434                         bool ipvalid = true;
 435                         QueryType start_type = DNS_QUERY_A;
 436 #ifdef IPV6
 437                         start_type = DNS_QUERY_AAAA;
 438                         if (strchr(L->IPAddr.c_str(),':'))
 439                         {
 440                                 in6_addr n;
 441                                 if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 442                                         ipvalid = false;
 443                         }
 444                         else
 445 #endif
 446                         {
 447                                 in_addr n;
 448                                 if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 449                                         ipvalid = false;
 450                         }
 451                         if (!ipvalid)
 452                         {
 453                                 try
 454                                 {
 455                                         bool cached;
 456                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 457                                         ServerInstance->AddResolver(sr, cached);
 458                                 }
 459                                 catch (...)
 460                                 {
 461                                 }
 462                         }
 463                 }
 464         }
 465 }
 466
 467 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 468 {
 469         ConfigReader* Conf = new ConfigReader(ServerInstance);
 470         if (rebind)
 471         {
 472                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 473                 {
 474                         std::string Type = Conf->ReadValue("bind","type",j);
 475                         std::string IP = Conf->ReadValue("bind","address",j);
 476                         std::string Port = Conf->ReadValue("bind","port",j);
 477                         std::string transport = Conf->ReadValue("bind","transport",j);
 478                         if (Type == "servers")
 479                         {
 480                                 irc::portparser portrange(Port, false);
 481                                 int portno = -1;
 482                                 while ((portno = portrange.GetToken()))
 483                                 {
 484                                         if (IP == "*")
 485                                                 IP.clear();
 486
 487                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 488                                         {
 489                                                 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());
 490                                                 break;
 491                                         }
 492
 493                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 494                                         if (listener->GetState() == I_LISTENING)
 495                                         {
 496                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 497                                                 Bindings.push_back(listener);
 498                                         }
 499                                         else
 500                                         {
 501                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 502                                                 listener->Close();
 503                                         }
 504                                 }
 505                         }
 506                 }
 507         }
 508         FlatLinks = Conf->ReadFlag("options","flatlinks",0);
 509         HideULines = Conf->ReadFlag("options","hideulines",0);
 510         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 511         EnableTimeSync = Conf->ReadFlag("timesync","enable",0);
 512         MasterTime = Conf->ReadFlag("timesync", "master", 0);
 513         ChallengeResponse = !Conf->ReadFlag("options", "disablehmac", 0);
 514         quiet_bursts = Conf->ReadFlag("options", "quietbursts", 0);
 515         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 516         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 517
 518         if (PingFreq == 0)
 519                 PingFreq = 60;
 520
 521         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 522                 PingWarnTime = 0;
 523
 524         LinkBlocks.clear();
 525         ValidIPs.clear();
 526         for (int j = 0; j < Conf->Enumerate("link"); j++)
 527         {
 528                 Link L;
 529                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 530                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 531                 L.AllowMask = Allow;
 532                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 533                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 534                 L.Port = Conf->ReadInteger("link", "port", j, true);
 535                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 536                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 537                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 538                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 539                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 540                 L.Hook = Conf->ReadValue("link", "transport", j);
 541                 L.Bind = Conf->ReadValue("link", "bind", j);
 542                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 543
 544                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 545                 {
 546                         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.",
 547                         L.Hook.c_str(), L.Name.c_str());
 548                         continue;
 549
 550                 }
 551
 552                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 553                 /* Bugfix by brain, do not allow people to enter bad configurations */
 554                 if (L.Name != ServerInstance->Config->ServerName)
 555                 {
 556                         if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 557                         {
 558                                 ValidIPs.push_back(L.IPAddr);
 559
 560                                 if (Allow.length())
 561                                         ValidIPs.push_back(Allow);
 562
 563                                 /* Needs resolving */
 564                                 bool ipvalid = true;
 565                                 QueryType start_type = DNS_QUERY_A;
 566 #ifdef IPV6
 567                                 start_type = DNS_QUERY_AAAA;
 568                                 if (strchr(L.IPAddr.c_str(),':'))
 569                                 {
 570                                         in6_addr n;
 571                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 572                                                 ipvalid = false;
 573                                 }
 574                                 else
 575                                 {
 576                                         in_addr n;
 577                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 578                                                 ipvalid = false;
 579                                 }
 580 #else
 581                                 in_addr n;
 582                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 583                                         ipvalid = false;
 584 #endif
 585
 586                                 if (!ipvalid)
 587                                 {
 588                                         try
 589                                         {
 590                                                 bool cached;
 591                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 592                                                 ServerInstance->AddResolver(sr, cached);
 593                                         }
 594                                         catch (...)
 595                                         {
 596                                         }
 597                                 }
 598
 599                                 LinkBlocks.push_back(L);
 600                         }
 601                         else
 602                         {
 603                                 if (L.IPAddr.empty())
 604                                 {
 605                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', IP address not defined!",L.Name.c_str());
 606                                 }
 607                                 else if (L.RecvPass.empty())
 608                                 {
 609                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', recvpass not defined!",L.Name.c_str());
 610                                 }
 611                                 else if (L.SendPass.empty())
 612                                 {
 613                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', sendpass not defined!",L.Name.c_str());
 614                                 }
 615                                 else if (L.Name.empty())
 616                                 {
 617                                         ServerInstance->Log(DEFAULT,"Invalid configuration, link tag without a name!");
 618                                 }
 619                                 else if (!L.Port)
 620                                 {
 621                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', no port specified!",L.Name.c_str());
 622                                 }
 623                         }
 624                 }
 625                 else
 626                 {
 627                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', link tag has the same server name as the local server!",L.Name.c_str());
 628                 }
 629         }
 630         DELETE(Conf);
 631 }
 632
 633 void SpanningTreeUtilities::DoFailOver(Link* x)
 634 {
 635         if (x->FailOver.length())
 636         {
 637                 if (x->FailOver == x->Name)
 638                 {
 639                         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());
 640                         return;
 641                 }
 642                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 643                 if (TryThisOne)
 644                 {
 645                         Creator->RemoteMessage(NULL,"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 646                         Creator->ConnectServer(TryThisOne);
 647                 }
 648                 else
 649                 {
 650                         Creator->RemoteMessage(NULL,"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 651                 }
 652         }
 653 }
 654
 655 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 656 {
 657         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 658         {
 659                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
 660                 {
 661                         return &(*x);
 662                 }
 663         }
 664         return NULL;
 665 }
 666