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 "commands/cmd_whois.h"
  16 #include "commands/cmd_stats.h"
  17 #include "socket.h"
  18 #include "wildcard.h"
  19 #include "xline.h"
  20 #include "transport.h"
  21 #include "socketengine.h"
  22
  23 #include "m_spanningtree/main.h"
  24 #include "m_spanningtree/utils.h"
  25 #include "m_spanningtree/treeserver.h"
  26 #include "m_spanningtree/link.h"
  27 #include "m_spanningtree/treesocket.h"
  28 #include "m_spanningtree/resolvers.h"
  29
  30 /* $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 */
  31
  32 bool SpanningTreeUtilities::IsSID(const std::string &str)
  33 {
  34         /* Returns true if the string given is exactly 3 characters long,
  35          * starts with a digit, and the other two characters are A-Z or digits
  36          */
  37         return ((str.length() == 3) && isdigit(str[0]) &&
  38                         ((str[1] >= 'A' && str[1] <= 'Z') || isdigit(str[1])) &&
  39                          ((str[2] >= 'A' && str[2] <= 'Z') || isdigit(str[2])));
  40 }
  41
  42 /** Yay for fast searches!
  43  * This is hundreds of times faster than recursion
  44  * or even scanning a linked list, especially when
  45  * there are more than a few servers to deal with.
  46  * (read as: lots).
  47  */
  48 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  49 {
  50         if (IsSID(ServerName))
  51                 return this->FindServerID(ServerName);
  52
  53         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  54         if (iter != serverlist.end())
  55         {
  56                 return iter->second;
  57         }
  58         else
  59         {
  60                 return NULL;
  61         }
  62 }
  63
  64 TreeServer* SpanningTreeUtilities::FindRemoteBurstServer(TreeServer* Server)
  65 {
  66         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  67         if (iter != RemoteServersBursting.end())
  68                 return iter->second;
  69         else
  70                 return NULL;
  71 }
  72
  73 TreeSocket* SpanningTreeUtilities::FindBurstingServer(const std::string &ServerName)
  74 {
  75         std::map<irc::string,TreeSocket*>::iterator iter;
  76         iter = burstingserverlist.find(ServerName.c_str());
  77         if (iter != burstingserverlist.end())
  78         {
  79                 return iter->second;
  80         }
  81         else
  82         {
  83                 return NULL;
  84         }
  85 }
  86
  87 void SpanningTreeUtilities::SetRemoteBursting(TreeServer* Server, bool bursting)
  88 {
  89         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  90         if (bursting)
  91         {
  92                 if (iter == RemoteServersBursting.end())
  93                         RemoteServersBursting.insert(make_pair(Server->GetName(), Server));
  94                 else return;
  95         }
  96         else
  97         {
  98                 if (iter != RemoteServersBursting.end())
  99                         RemoteServersBursting.erase(iter);
 100                 else return;
 101         }
 102         ServerInstance->Log(DEBUG,"Server %s is %sbursting nicknames", Server->GetName().c_str(), bursting ? "" : "no longer ");
 103 }
 104
 105 void SpanningTreeUtilities::AddBurstingServer(const std::string &ServerName, TreeSocket* s)
 106 {
 107         std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.find(ServerName.c_str());
 108         if (iter == burstingserverlist.end())
 109                 burstingserverlist[ServerName.c_str()] = s;
 110 }
 111
 112 void SpanningTreeUtilities::DelBurstingServer(TreeSocket* s)
 113 {
 114          for (std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.begin(); iter != burstingserverlist.end(); iter++)
 115          {
 116                  if (iter->second == s)
 117                  {
 118                          burstingserverlist.erase(iter);
 119                          return;
 120                  }
 121          }
 122 }
 123
 124 /** Returns the locally connected server we must route a
 125  * message through to reach server 'ServerName'. This
 126  * only applies to one-to-one and not one-to-many routing.
 127  * See the comments for the constructor of TreeServer
 128  * for more details.
 129  */
 130 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
 131 {
 132         if (ServerName.c_str() == TreeRoot->GetName() || ServerName == ServerInstance->Config->GetSID())
 133                 return NULL;
 134         TreeServer* Found = FindServer(ServerName);
 135         if (Found)
 136         {
 137                 return Found->GetRoute();
 138         }
 139         else
 140         {
 141                 return NULL;
 142         }
 143 }
 144
 145 /** Find the first server matching a given glob mask.
 146  * Theres no find-using-glob method of hash_map [awwww :-(]
 147  * so instead, we iterate over the list using an iterator
 148  * and match each one until we get a hit. Yes its slow,
 149  * deal with it.
 150  */
 151 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 152 {
 153         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 154         {
 155                 if (match(i->first.c_str(),ServerName.c_str()))
 156                         return i->second;
 157         }
 158         return NULL;
 159 }
 160
 161 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 162 {
 163         server_hash::iterator iter = sidlist.find(id);
 164         if (iter != sidlist.end())
 165                 return iter->second;
 166         else
 167                 return NULL;
 168 }
 169
 170 /* A convenient wrapper that returns true if a server exists */
 171 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 172 {
 173         return (FindServer(ServerName) != NULL);
 174 }
 175
 176 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 177 {
 178         Bindings.clear();
 179
 180         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 181
 182         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 183
 184         /* Did we find any modules? */
 185         if (ml)
 186         {
 187                 /* Yes, enumerate them all to find out the hook name */
 188                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 189                 {
 190                         /* Make a request to it for its name, its implementing
 191                          * BufferedSocketHook so we know its safe to do this
 192                          */
 193                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 194                         /* Build a map of them */
 195                         hooks[name.c_str()] = *m;
 196                         hooknames.push_back(name);
 197                 }
 198         }
 199
 200         this->ReadConfiguration(true);
 201 }
 202
 203 SpanningTreeUtilities::~SpanningTreeUtilities()
 204 {
 205         for (unsigned int i = 0; i < Bindings.size(); i++)
 206         {
 207                 ServerInstance->SE->DelFd(Bindings[i]);
 208                 Bindings[i]->Close();
 209         }
 210         while (TreeRoot->ChildCount())
 211         {
 212                 TreeServer* child_server = TreeRoot->GetChild(0);
 213                 if (child_server)
 214                 {
 215                         TreeSocket* sock = child_server->GetSocket();
 216                         ServerInstance->SE->DelFd(sock);
 217                         sock->Close();
 218                 }
 219         }
 220         delete TreeRoot;
 221         ServerInstance->BufferedSocketCull();
 222 }
 223
 224 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 225 {
 226         if (list.find(server) == list.end())
 227                 list[server] = server;
 228 }
 229
 230 /* returns a list of DIRECT servernames for a specific channel */
 231 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 232 {
 233         CUList *ulist;
 234         switch (status)
 235         {
 236                 case '@':
 237                         ulist = c->GetOppedUsers();
 238                 break;
 239                 case '%':
 240                         ulist = c->GetHalfoppedUsers();
 241                 break;
 242                 case '+':
 243                         ulist = c->GetVoicedUsers();
 244                 break;
 245                 default:
 246                         ulist = c->GetUsers();
 247                 break;
 248         }
 249         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 250         {
 251                 if ((i->first->GetFd() < 0) && (exempt_list.find(i->first) == exempt_list.end()))
 252                 {
 253                         TreeServer* best = this->BestRouteTo(i->first->server);
 254                         if (best)
 255                                 AddThisServer(best,list);
 256                 }
 257         }
 258         return;
 259 }
 260
 261 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 262 {
 263         char pfx = 0;
 264         TreeServer* omitroute = this->BestRouteTo(omit);
 265         if ((command == "NOTICE") || (command == "PRIVMSG"))
 266         {
 267                 if (params.size() >= 2)
 268                 {
 269                         /* Prefixes */
 270                         if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
 271                         {
 272                                 pfx = params[0][0];
 273                                 params[0] = params[0].substr(1, params[0].length()-1);
 274                         }
 275                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 276                         {
 277                                 // special routing for private messages/notices
 278                                 User* d = ServerInstance->FindNick(params[0]);
 279                                 if (d)
 280                                 {
 281                                         std::deque<std::string> par;
 282                                         par.push_back(params[0]);
 283                                         par.push_back(":"+params[1]);
 284                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 285                                         return true;
 286                                 }
 287                         }
 288                         else if (*(params[0].c_str()) == '$')
 289                         {
 290                                 std::deque<std::string> par;
 291                                 par.push_back(params[0]);
 292                                 par.push_back(":"+params[1]);
 293                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 294                                 return true;
 295                         }
 296                         else
 297                         {
 298                                 Channel* c = ServerInstance->FindChan(params[0]);
 299                                 User* u = ServerInstance->FindNick(prefix);
 300                                 if (c && u)
 301                                 {
 302                                         CUList elist;
 303                                         TreeServerList list;
 304                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 305                                         GetListOfServersForChannel(c,list,pfx,elist);
 306
 307                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 308                                         {
 309                                                 TreeSocket* Sock = i->second->GetSocket();
 310                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 311                                                 {
 312                                                         Sock->WriteLine(data);
 313                                                 }
 314                                         }
 315                                         return true;
 316                                 }
 317                         }
 318                 }
 319         }
 320         unsigned int items =this->TreeRoot->ChildCount();
 321         for (unsigned int x = 0; x < items; x++)
 322         {
 323                 TreeServer* Route = this->TreeRoot->GetChild(x);
 324                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 325                 {
 326                         TreeSocket* Sock = Route->GetSocket();
 327                         if (Sock)
 328                                 Sock->WriteLine(data);
 329                 }
 330         }
 331         return true;
 332 }
 333
 334 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 335 {
 336         TreeServer* omitroute = this->BestRouteTo(omit);
 337         std::string FullLine = ":" + prefix + " " + command;
 338         unsigned int words = params.size();
 339         for (unsigned int x = 0; x < words; x++)
 340         {
 341                 FullLine = FullLine + " " + params[x];
 342         }
 343         unsigned int items = this->TreeRoot->ChildCount();
 344         for (unsigned int x = 0; x < items; x++)
 345         {
 346                 TreeServer* Route = this->TreeRoot->GetChild(x);
 347                 // Send the line IF:
 348                 // The route has a socket (its a direct connection)
 349                 // The route isnt the one to be omitted
 350                 // The route isnt the path to the one to be omitted
 351                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 352                 {
 353                         TreeSocket* Sock = Route->GetSocket();
 354                         if (Sock)
 355                                 Sock->WriteLine(FullLine);
 356                 }
 357         }
 358         return true;
 359 }
 360
 361 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 362 {
 363         std::string FullLine = ":" + prefix + " " + command;
 364         unsigned int words = params.size();
 365         for (unsigned int x = 0; x < words; x++)
 366         {
 367                 FullLine = FullLine + " " + params[x];
 368         }
 369         unsigned int items = this->TreeRoot->ChildCount();
 370         for (unsigned int x = 0; x < items; x++)
 371         {
 372                 TreeServer* Route = this->TreeRoot->GetChild(x);
 373                 if (Route && Route->GetSocket())
 374                 {
 375                         TreeSocket* Sock = Route->GetSocket();
 376                         if (Sock)
 377                                 Sock->WriteLine(FullLine);
 378                 }
 379         }
 380         return true;
 381 }
 382
 383 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 384 {
 385         std::string spfx = prefix;
 386         std::string scmd = command;
 387         return this->DoOneToMany(spfx, scmd, params);
 388 }
 389
 390 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 391 {
 392         std::string spfx = prefix;
 393         std::string scmd = command;
 394         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 395 }
 396
 397 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 398 {
 399         TreeServer* Route = this->BestRouteTo(target);
 400         if (Route)
 401         {
 402                 std::string FullLine = ":" + prefix + " " + command;
 403                 unsigned int words = params.size();
 404                 for (unsigned int x = 0; x < words; x++)
 405                 {
 406                         FullLine = FullLine + " " + params[x];
 407                 }
 408                 if (Route && Route->GetSocket())
 409                 {
 410                         TreeSocket* Sock = Route->GetSocket();
 411                         if (Sock)
 412                                 Sock->WriteLine(FullLine);
 413                 }
 414                 return true;
 415         }
 416         else
 417         {
 418                 return false;
 419         }
 420 }
 421
 422 void SpanningTreeUtilities::RefreshIPCache()
 423 {
 424         ValidIPs.clear();
 425         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 426         {
 427                 if ((!L->IPAddr.empty()) && (!L->RecvPass.empty()) && (!L->SendPass.empty()) && (!L->Name.empty()) && (L->Port))
 428                 {
 429                         ValidIPs.push_back(L->IPAddr);
 430
 431                         if (L->AllowMask.length())
 432                                 ValidIPs.push_back(L->AllowMask);
 433
 434                         /* Needs resolving */
 435                         bool ipvalid = true;
 436                         QueryType start_type = DNS_QUERY_A;
 437 #ifdef IPV6
 438                         start_type = DNS_QUERY_AAAA;
 439                         if (strchr(L->IPAddr.c_str(),':'))
 440                         {
 441                                 in6_addr n;
 442                                 if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 443                                         ipvalid = false;
 444                         }
 445                         else
 446 #endif
 447                         {
 448                                 in_addr n;
 449                                 if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 450                                         ipvalid = false;
 451                         }
 452                         if (!ipvalid)
 453                         {
 454                                 try
 455                                 {
 456                                         bool cached;
 457                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 458                                         ServerInstance->AddResolver(sr, cached);
 459                                 }
 460                                 catch (...)
 461                                 {
 462                                 }
 463                         }
 464                 }
 465         }
 466 }
 467
 468 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 469 {
 470         ConfigReader* Conf = new ConfigReader(ServerInstance);
 471         if (rebind)
 472         {
 473                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 474                 {
 475                         std::string Type = Conf->ReadValue("bind","type",j);
 476                         std::string IP = Conf->ReadValue("bind","address",j);
 477                         std::string Port = Conf->ReadValue("bind","port",j);
 478                         std::string transport = Conf->ReadValue("bind","transport",j);
 479                         if (Type == "servers")
 480                         {
 481                                 irc::portparser portrange(Port, false);
 482                                 int portno = -1;
 483                                 while ((portno = portrange.GetToken()))
 484                                 {
 485                                         if (IP == "*")
 486                                                 IP.clear();
 487
 488                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 489                                         {
 490                                                 throw CoreException("Can't find transport type '"+transport+"' for port "+IP+":"+Port+" - maybe you forgot to load it BEFORE m_spanningtree in your config file?");
 491                                                 break;
 492                                         }
 493
 494                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 495                                         if (listener->GetState() == I_LISTENING)
 496                                         {
 497                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 498                                                 Bindings.push_back(listener);
 499                                         }
 500                                         else
 501                                         {
 502                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 503                                                 listener->Close();
 504                                         }
 505                                 }
 506                         }
 507                 }
 508         }
 509         FlatLinks = Conf->ReadFlag("options","flatlinks",0);
 510         HideULines = Conf->ReadFlag("options","hideulines",0);
 511         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 512         EnableTimeSync = Conf->ReadFlag("timesync","enable",0);
 513         MasterTime = Conf->ReadFlag("timesync", "master", 0);
 514         ChallengeResponse = !Conf->ReadFlag("options", "disablehmac", 0);
 515         quiet_bursts = Conf->ReadFlag("options", "quietbursts", 0);
 516         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 517         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 518
 519         if (PingFreq == 0)
 520                 PingFreq = 60;
 521
 522         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 523                 PingWarnTime = 0;
 524
 525         LinkBlocks.clear();
 526         ValidIPs.clear();
 527         for (int j = 0; j < Conf->Enumerate("link"); j++)
 528         {
 529                 Link L;
 530                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 531                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 532                 L.AllowMask = Allow;
 533                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 534                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 535                 L.Port = Conf->ReadInteger("link", "port", j, true);
 536                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 537                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 538                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 539                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 540                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 541                 L.Hook = Conf->ReadValue("link", "transport", j);
 542                 L.Bind = Conf->ReadValue("link", "bind", j);
 543                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 544
 545                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 546                 {
 547                         throw CoreException("Can't find transport type '"+L.Hook+"' for link '"+assign(L.Name)+"' - maybe you forgot to load it BEFORE m_spanningtree in your config file? Skipping <link> tag completely.");
 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                                 if (L.Name.find('.') == std::string::npos)
 559                                         throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 560
 561                                 if (L.Name.length() > 64)
 562                                         throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 563
 564                                 ValidIPs.push_back(L.IPAddr);
 565
 566                                 if (Allow.length())
 567                                         ValidIPs.push_back(Allow);
 568
 569                                 /* Needs resolving */
 570                                 bool ipvalid = true;
 571                                 QueryType start_type = DNS_QUERY_A;
 572 #ifdef IPV6
 573                                 start_type = DNS_QUERY_AAAA;
 574                                 if (strchr(L.IPAddr.c_str(),':'))
 575                                 {
 576                                         in6_addr n;
 577                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 578                                                 ipvalid = false;
 579                                 }
 580                                 else
 581                                 {
 582                                         in_addr n;
 583                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 584                                                 ipvalid = false;
 585                                 }
 586 #else
 587                                 in_addr n;
 588                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 589                                         ipvalid = false;
 590 #endif
 591
 592                                 if (!ipvalid)
 593                                 {
 594                                         try
 595                                         {
 596                                                 bool cached;
 597                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 598                                                 ServerInstance->AddResolver(sr, cached);
 599                                         }
 600                                         catch (...)
 601                                         {
 602                                         }
 603                                 }
 604
 605                                 LinkBlocks.push_back(L);
 606                         }
 607                         else
 608                         {
 609                                 if (L.IPAddr.empty())
 610                                 {
 611                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', IP address not defined!");
 612                                 }
 613                                 else if (L.RecvPass.empty())
 614                                 {
 615                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 616                                 }
 617                                 else if (L.SendPass.empty())
 618                                 {
 619                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 620                                 }
 621                                 else if (L.Name.empty())
 622                                 {
 623                                         throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 624                                 }
 625                                 else if (!L.Port)
 626                                 {
 627                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', no port specified!");
 628                                 }
 629                         }
 630                 }
 631                 else
 632                 {
 633                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', link tag has the same server name as the local server!");
 634                 }
 635         }
 636         delete Conf;
 637 }
 638
 639 void SpanningTreeUtilities::DoFailOver(Link* x)
 640 {
 641         if (x->FailOver.length())
 642         {
 643                 if (x->FailOver == x->Name)
 644                 {
 645                         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());
 646                         return;
 647                 }
 648                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 649                 if (TryThisOne)
 650                 {
 651                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 652                         if (CheckDupe)
 653                         {
 654                                 ServerInstance->Log(DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 655                         }
 656                         else
 657                         {
 658                                 Creator->RemoteMessage(NULL,"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 659                                 Creator->ConnectServer(TryThisOne);
 660                         }
 661                 }
 662                 else
 663                 {
 664                         Creator->RemoteMessage(NULL,"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 665                 }
 666         }
 667 }
 668
 669 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 670 {
 671         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 672         {
 673                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
 674                 {
 675                         return &(*x);
 676                 }
 677         }
 678         return NULL;
 679 }