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 has no '.' in the other 2
  36          */
  37         return ((str.length() == 3) && isdigit(str[0]) && (str[1] != '.' && str[2] != '.'));
  38 }
  39
  40 /** Yay for fast searches!
  41  * This is hundreds of times faster than recursion
  42  * or even scanning a linked list, especially when
  43  * there are more than a few servers to deal with.
  44  * (read as: lots).
  45  */
  46 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  47 {
  48         if (IsSID(ServerName))
  49                 return this->FindServerID(ServerName);
  50
  51         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  52         if (iter != serverlist.end())
  53         {
  54                 return iter->second;
  55         }
  56         else
  57         {
  58                 return NULL;
  59         }
  60 }
  61
  62 TreeServer* SpanningTreeUtilities::FindRemoteBurstServer(TreeServer* Server)
  63 {
  64         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  65         if (iter != RemoteServersBursting.end())
  66                 return iter->second;
  67         else
  68                 return NULL;
  69 }
  70
  71 TreeSocket* SpanningTreeUtilities::FindBurstingServer(const std::string &ServerName)
  72 {
  73         std::map<irc::string,TreeSocket*>::iterator iter;
  74         iter = burstingserverlist.find(ServerName.c_str());
  75         if (iter != burstingserverlist.end())
  76         {
  77                 return iter->second;
  78         }
  79         else
  80         {
  81                 return NULL;
  82         }
  83 }
  84
  85 void SpanningTreeUtilities::SetRemoteBursting(TreeServer* Server, bool bursting)
  86 {
  87         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  88         if (bursting)
  89         {
  90                 if (iter == RemoteServersBursting.end())
  91                         RemoteServersBursting.insert(make_pair(Server->GetName(), Server));
  92                 else return;
  93         }
  94         else
  95         {
  96                 if (iter != RemoteServersBursting.end())
  97                         RemoteServersBursting.erase(iter);
  98                 else return;
  99         }
 100         ServerInstance->Log(DEBUG,"Server %s is %sbursting nicknames", Server->GetName().c_str(), bursting ? "" : "no longer ");
 101 }
 102
 103 void SpanningTreeUtilities::AddBurstingServer(const std::string &ServerName, TreeSocket* s)
 104 {
 105         std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.find(ServerName.c_str());
 106         if (iter == burstingserverlist.end())
 107                 burstingserverlist[ServerName.c_str()] = s;
 108 }
 109
 110 void SpanningTreeUtilities::DelBurstingServer(TreeSocket* s)
 111 {
 112          for (std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.begin(); iter != burstingserverlist.end(); iter++)
 113          {
 114                  if (iter->second == s)
 115                  {
 116                          burstingserverlist.erase(iter);
 117                          return;
 118                  }
 119          }
 120 }
 121
 122 /** Returns the locally connected server we must route a
 123  * message through to reach server 'ServerName'. This
 124  * only applies to one-to-one and not one-to-many routing.
 125  * See the comments for the constructor of TreeServer
 126  * for more details.
 127  */
 128 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
 129 {
 130         if (ServerName.c_str() == TreeRoot->GetName())
 131                 return NULL;
 132         TreeServer* Found = FindServer(ServerName);
 133         if (Found)
 134         {
 135                 return Found->GetRoute();
 136         }
 137         else
 138         {
 139                 return NULL;
 140         }
 141 }
 142
 143 /** Find the first server matching a given glob mask.
 144  * Theres no find-using-glob method of hash_map [awwww :-(]
 145  * so instead, we iterate over the list using an iterator
 146  * and match each one until we get a hit. Yes its slow,
 147  * deal with it.
 148  */
 149 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 150 {
 151         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 152         {
 153                 if (match(i->first.c_str(),ServerName.c_str()))
 154                         return i->second;
 155         }
 156         return NULL;
 157 }
 158
 159 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 160 {
 161         ServerInstance->Log(DEBUG,"Looking for id: %s", id.c_str());
 162         server_hash::iterator iter = sidlist.find(id);
 163         if (iter != sidlist.end())
 164                 return iter->second;
 165         else
 166                 return NULL;
 167 }
 168
 169 /* A convenient wrapper that returns true if a server exists */
 170 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 171 {
 172         return (FindServer(ServerName) != NULL);
 173 }
 174
 175 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 176 {
 177         Bindings.clear();
 178
 179         std::string OurSID;
 180
 181         OurSID += (char)((Instance->Config->sid / 100) + 48);
 182         OurSID += (char)((Instance->Config->sid / 10) % 10 + 48);
 183         OurSID += (char)(Instance->Config->sid % 10 + 48);
 184
 185         lines_to_apply = 0;
 186
 187         ServerInstance->Log(DEBUG, "SpanningTreeUtilities: SID: %s", OurSID.c_str());
 188
 189         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, OurSID);
 190
 191         modulelist* ml = ServerInstance->FindInterface("InspSocketHook");
 192
 193         /* Did we find any modules? */
 194         if (ml)
 195         {
 196                 /* Yes, enumerate them all to find out the hook name */
 197                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 198                 {
 199                         /* Make a request to it for its name, its implementing
 200                          * InspSocketHook so we know its safe to do this
 201                          */
 202                         std::string name = InspSocketNameRequest((Module*)Creator, *m).Send();
 203                         /* Build a map of them */
 204                         hooks[name.c_str()] = *m;
 205                         hooknames.push_back(name);
 206                 }
 207         }
 208
 209         this->ReadConfiguration(true);
 210 }
 211
 212 SpanningTreeUtilities::~SpanningTreeUtilities()
 213 {
 214         for (unsigned int i = 0; i < Bindings.size(); i++)
 215         {
 216                 ServerInstance->SE->DelFd(Bindings[i]);
 217                 Bindings[i]->Close();
 218         }
 219         while (TreeRoot->ChildCount())
 220         {
 221                 TreeServer* child_server = TreeRoot->GetChild(0);
 222                 if (child_server)
 223                 {
 224                         TreeSocket* sock = child_server->GetSocket();
 225                         ServerInstance->SE->DelFd(sock);
 226                         sock->Close();
 227                 }
 228         }
 229         delete TreeRoot;
 230         ServerInstance->InspSocketCull();
 231 }
 232
 233 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 234 {
 235         if (list.find(server) == list.end())
 236                 list[server] = server;
 237 }
 238
 239 /* returns a list of DIRECT servernames for a specific channel */
 240 void SpanningTreeUtilities::GetListOfServersForChannel(chanrec* c, TreeServerList &list, char status, const CUList &exempt_list)
 241 {
 242         CUList *ulist;
 243         switch (status)
 244         {
 245                 case '@':
 246                         ulist = c->GetOppedUsers();
 247                 break;
 248                 case '%':
 249                         ulist = c->GetHalfoppedUsers();
 250                 break;
 251                 case '+':
 252                         ulist = c->GetVoicedUsers();
 253                 break;
 254                 default:
 255                         ulist = c->GetUsers();
 256                 break;
 257         }
 258         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 259         {
 260                 if ((i->first->GetFd() < 0) && (exempt_list.find(i->first) == exempt_list.end()))
 261                 {
 262                         TreeServer* best = this->BestRouteTo(i->first->server);
 263                         if (best)
 264                                 AddThisServer(best,list);
 265                 }
 266         }
 267         return;
 268 }
 269
 270 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 271 {
 272         char pfx = 0;
 273         TreeServer* omitroute = this->BestRouteTo(omit);
 274         if ((command == "NOTICE") || (command == "PRIVMSG"))
 275         {
 276                 if (params.size() >= 2)
 277                 {
 278                         /* Prefixes */
 279                         if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
 280                         {
 281                                 pfx = params[0][0];
 282                                 params[0] = params[0].substr(1, params[0].length()-1);
 283                         }
 284                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 285                         {
 286                                 // special routing for private messages/notices
 287                                 userrec* d = ServerInstance->FindNick(params[0]);
 288                                 if (d)
 289                                 {
 290                                         std::deque<std::string> par;
 291                                         par.push_back(params[0]);
 292                                         par.push_back(":"+params[1]);
 293                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 294                                         return true;
 295                                 }
 296                         }
 297                         else if (*(params[0].c_str()) == '$')
 298                         {
 299                                 std::deque<std::string> par;
 300                                 par.push_back(params[0]);
 301                                 par.push_back(":"+params[1]);
 302                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 303                                 return true;
 304                         }
 305                         else
 306                         {
 307                                 chanrec* c = ServerInstance->FindChan(params[0]);
 308                                 userrec* u = ServerInstance->FindNick(prefix);
 309                                 if (c && u)
 310                                 {
 311                                         CUList elist;
 312                                         TreeServerList list;
 313                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist));
 314                                         GetListOfServersForChannel(c,list,pfx,elist);
 315
 316                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 317                                         {
 318                                                 TreeSocket* Sock = i->second->GetSocket();
 319                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 320                                                 {
 321                                                         Sock->WriteLine(data);
 322                                                 }
 323                                         }
 324                                         return true;
 325                                 }
 326                         }
 327                 }
 328         }
 329         unsigned int items =this->TreeRoot->ChildCount();
 330         for (unsigned int x = 0; x < items; x++)
 331         {
 332                 TreeServer* Route = this->TreeRoot->GetChild(x);
 333                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 334                 {
 335                         TreeSocket* Sock = Route->GetSocket();
 336                         if (Sock)
 337                                 Sock->WriteLine(data);
 338                 }
 339         }
 340         return true;
 341 }
 342
 343 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 344 {
 345         TreeServer* omitroute = this->BestRouteTo(omit);
 346         std::string FullLine = ":" + prefix + " " + command;
 347         unsigned int words = params.size();
 348         for (unsigned int x = 0; x < words; x++)
 349         {
 350                 FullLine = FullLine + " " + params[x];
 351         }
 352         unsigned int items = this->TreeRoot->ChildCount();
 353         for (unsigned int x = 0; x < items; x++)
 354         {
 355                 TreeServer* Route = this->TreeRoot->GetChild(x);
 356                 // Send the line IF:
 357                 // The route has a socket (its a direct connection)
 358                 // The route isnt the one to be omitted
 359                 // The route isnt the path to the one to be omitted
 360                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 361                 {
 362                         TreeSocket* Sock = Route->GetSocket();
 363                         if (Sock)
 364                                 Sock->WriteLine(FullLine);
 365                 }
 366         }
 367         return true;
 368 }
 369
 370 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 371 {
 372         std::string FullLine = ":" + prefix + " " + command;
 373         unsigned int words = params.size();
 374         for (unsigned int x = 0; x < words; x++)
 375         {
 376                 FullLine = FullLine + " " + params[x];
 377         }
 378         unsigned int items = this->TreeRoot->ChildCount();
 379         for (unsigned int x = 0; x < items; x++)
 380         {
 381                 TreeServer* Route = this->TreeRoot->GetChild(x);
 382                 if (Route && Route->GetSocket())
 383                 {
 384                         TreeSocket* Sock = Route->GetSocket();
 385                         if (Sock)
 386                                 Sock->WriteLine(FullLine);
 387                 }
 388         }
 389         return true;
 390 }
 391
 392 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 393 {
 394         std::string spfx = prefix;
 395         std::string scmd = command;
 396         return this->DoOneToMany(spfx, scmd, params);
 397 }
 398
 399 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 400 {
 401         std::string spfx = prefix;
 402         std::string scmd = command;
 403         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 404 }
 405
 406 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 407 {
 408         TreeServer* Route = this->BestRouteTo(target);
 409         if (Route)
 410         {
 411                 std::string FullLine = ":" + prefix + " " + command;
 412                 unsigned int words = params.size();
 413                 for (unsigned int x = 0; x < words; x++)
 414                 {
 415                         FullLine = FullLine + " " + params[x];
 416                 }
 417                 if (Route && Route->GetSocket())
 418                 {
 419                         TreeSocket* Sock = Route->GetSocket();
 420                         if (Sock)
 421                                 Sock->WriteLine(FullLine);
 422                 }
 423                 return true;
 424         }
 425         else
 426         {
 427                 return false;
 428         }
 429 }
 430
 431 void SpanningTreeUtilities::RefreshIPCache()
 432 {
 433         ValidIPs.clear();
 434         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 435         {
 436                 if ((!L->IPAddr.empty()) && (!L->RecvPass.empty()) && (!L->SendPass.empty()) && (!L->Name.empty()) && (L->Port))
 437                 {
 438                         ValidIPs.push_back(L->IPAddr);
 439
 440                         if (L->AllowMask.length())
 441                                 ValidIPs.push_back(L->AllowMask);
 442
 443                         /* Needs resolving */
 444                         bool ipvalid = true;
 445                         QueryType start_type = DNS_QUERY_A;
 446 #ifdef IPV6
 447                         start_type = DNS_QUERY_AAAA;
 448                         if (strchr(L->IPAddr.c_str(),':'))
 449                         {
 450                                 in6_addr n;
 451                                 if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 452                                         ipvalid = false;
 453                         }
 454                         else
 455 #endif
 456                         {
 457                                 in_addr n;
 458                                 if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 459                                         ipvalid = false;
 460                         }
 461                         if (!ipvalid)
 462                         {
 463                                 try
 464                                 {
 465                                         bool cached;
 466                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 467                                         ServerInstance->AddResolver(sr, cached);
 468                                 }
 469                                 catch (...)
 470                                 {
 471                                 }
 472                         }
 473                 }
 474         }
 475 }
 476
 477 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 478 {
 479         ConfigReader* Conf = new ConfigReader(ServerInstance);
 480         if (rebind)
 481         {
 482                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 483                 {
 484                         std::string Type = Conf->ReadValue("bind","type",j);
 485                         std::string IP = Conf->ReadValue("bind","address",j);
 486                         std::string Port = Conf->ReadValue("bind","port",j);
 487                         std::string transport = Conf->ReadValue("bind","transport",j);
 488                         if (Type == "servers")
 489                         {
 490                                 irc::portparser portrange(Port, false);
 491                                 int portno = -1;
 492                                 while ((portno = portrange.GetToken()))
 493                                 {
 494                                         if (IP == "*")
 495                                                 IP.clear();
 496
 497                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 498                                         {
 499                                                 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());
 500                                                 break;
 501                                         }
 502
 503                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 504                                         if (listener->GetState() == I_LISTENING)
 505                                         {
 506                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 507                                                 Bindings.push_back(listener);
 508                                         }
 509                                         else
 510                                         {
 511                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 512                                                 listener->Close();
 513                                         }
 514                                 }
 515                         }
 516                 }
 517         }
 518         FlatLinks = Conf->ReadFlag("options","flatlinks",0);
 519         HideULines = Conf->ReadFlag("options","hideulines",0);
 520         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 521         EnableTimeSync = Conf->ReadFlag("timesync","enable",0);
 522         MasterTime = Conf->ReadFlag("timesync", "master", 0);
 523         ChallengeResponse = !Conf->ReadFlag("options", "disablehmac", 0);
 524         quiet_bursts = Conf->ReadFlag("options", "quietbursts", 0);
 525         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 526         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 527
 528         if (PingFreq == 0)
 529                 PingFreq = 60;
 530
 531         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 532                 PingWarnTime = 0;
 533
 534         LinkBlocks.clear();
 535         ValidIPs.clear();
 536         for (int j = 0; j < Conf->Enumerate("link"); j++)
 537         {
 538                 Link L;
 539                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 540                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 541                 L.AllowMask = Allow;
 542                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 543                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 544                 L.Port = Conf->ReadInteger("link", "port", j, true);
 545                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 546                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 547                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 548                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 549                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 550                 L.Hook = Conf->ReadValue("link", "transport", j);
 551                 L.Bind = Conf->ReadValue("link", "bind", j);
 552                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 553
 554                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 555                 {
 556                         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.",
 557                         L.Hook.c_str(), L.Name.c_str());
 558                         continue;
 559
 560                 }
 561
 562                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 563                 /* Bugfix by brain, do not allow people to enter bad configurations */
 564                 if (L.Name != ServerInstance->Config->ServerName)
 565                 {
 566                         if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 567                         {
 568                                 ValidIPs.push_back(L.IPAddr);
 569
 570                                 if (Allow.length())
 571                                         ValidIPs.push_back(Allow);
 572
 573                                 /* Needs resolving */
 574                                 bool ipvalid = true;
 575                                 QueryType start_type = DNS_QUERY_A;
 576 #ifdef IPV6
 577                                 start_type = DNS_QUERY_AAAA;
 578                                 if (strchr(L.IPAddr.c_str(),':'))
 579                                 {
 580                                         in6_addr n;
 581                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 582                                                 ipvalid = false;
 583                                 }
 584                                 else
 585                                 {
 586                                         in_addr n;
 587                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 588                                                 ipvalid = false;
 589                                 }
 590 #else
 591                                 in_addr n;
 592                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 593                                         ipvalid = false;
 594 #endif
 595
 596                                 if (!ipvalid)
 597                                 {
 598                                         try
 599                                         {
 600                                                 bool cached;
 601                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 602                                                 ServerInstance->AddResolver(sr, cached);
 603                                         }
 604                                         catch (...)
 605                                         {
 606                                         }
 607                                 }
 608
 609                                 LinkBlocks.push_back(L);
 610                         }
 611                         else
 612                         {
 613                                 if (L.IPAddr.empty())
 614                                 {
 615                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', IP address not defined!",L.Name.c_str());
 616                                 }
 617                                 else if (L.RecvPass.empty())
 618                                 {
 619                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', recvpass not defined!",L.Name.c_str());
 620                                 }
 621                                 else if (L.SendPass.empty())
 622                                 {
 623                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', sendpass not defined!",L.Name.c_str());
 624                                 }
 625                                 else if (L.Name.empty())
 626                                 {
 627                                         ServerInstance->Log(DEFAULT,"Invalid configuration, link tag without a name!");
 628                                 }
 629                                 else if (!L.Port)
 630                                 {
 631                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', no port specified!",L.Name.c_str());
 632                                 }
 633                         }
 634                 }
 635                 else
 636                 {
 637                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', link tag has the same server name as the local server!",L.Name.c_str());
 638                 }
 639         }
 640         DELETE(Conf);
 641 }
 642
 643 void SpanningTreeUtilities::DoFailOver(Link* x)
 644 {
 645         if (x->FailOver.length())
 646         {
 647                 if (x->FailOver == x->Name)
 648                 {
 649                         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());
 650                         return;
 651                 }
 652                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 653                 if (TryThisOne)
 654                 {
 655                         Creator->RemoteMessage(NULL,"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 656                         Creator->ConnectServer(TryThisOne);
 657                 }
 658                 else
 659                 {
 660                         Creator->RemoteMessage(NULL,"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 661                 }
 662         }
 663 }
 664
 665 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 666 {
 667         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 668         {
 669                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
 670                 {
 671                         return &(*x);
 672                 }
 673         }
 674         return NULL;
 675 }
 676