src/modules/m_spanningtree/utils.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 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 /** Yay for fast searches!
  33  * This is hundreds of times faster than recursion
  34  * or even scanning a linked list, especially when
  35  * there are more than a few servers to deal with.
  36  * (read as: lots).
  37  */
  38 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  39 {
  40         if (this->ServerInstance->IsSID(ServerName))
  41                 return this->FindServerID(ServerName);
  42
  43         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  44         if (iter != serverlist.end())
  45         {
  46                 return iter->second;
  47         }
  48         else
  49         {
  50                 return NULL;
  51         }
  52 }
  53
  54 TreeServer* SpanningTreeUtilities::FindRemoteBurstServer(TreeServer* Server)
  55 {
  56         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  57         if (iter != RemoteServersBursting.end())
  58                 return iter->second;
  59         else
  60                 return NULL;
  61 }
  62
  63 TreeSocket* SpanningTreeUtilities::FindBurstingServer(const std::string &ServerName)
  64 {
  65         std::map<irc::string,TreeSocket*>::iterator iter;
  66         iter = burstingserverlist.find(ServerName.c_str());
  67         if (iter != burstingserverlist.end())
  68         {
  69                 return iter->second;
  70         }
  71         else
  72         {
  73                 return NULL;
  74         }
  75 }
  76
  77 void SpanningTreeUtilities::SetRemoteBursting(TreeServer* Server, bool bursting)
  78 {
  79         server_hash::iterator iter = RemoteServersBursting.find(Server->GetName().c_str());
  80         if (bursting)
  81         {
  82                 if (iter == RemoteServersBursting.end())
  83                         RemoteServersBursting.insert(make_pair(Server->GetName(), Server));
  84                 else return;
  85         }
  86         else
  87         {
  88                 if (iter != RemoteServersBursting.end())
  89                         RemoteServersBursting.erase(iter);
  90                 else return;
  91         }
  92         ServerInstance->Log(DEBUG,"Server %s is %sbursting nicknames", Server->GetName().c_str(), bursting ? "" : "no longer ");
  93 }
  94
  95 void SpanningTreeUtilities::AddBurstingServer(const std::string &ServerName, TreeSocket* s)
  96 {
  97         std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.find(ServerName.c_str());
  98         if (iter == burstingserverlist.end())
  99                 burstingserverlist[ServerName.c_str()] = s;
 100 }
 101
 102 void SpanningTreeUtilities::DelBurstingServer(TreeSocket* s)
 103 {
 104          for (std::map<irc::string,TreeSocket*>::iterator iter = burstingserverlist.begin(); iter != burstingserverlist.end(); iter++)
 105          {
 106                  if (iter->second == s)
 107                  {
 108                          burstingserverlist.erase(iter);
 109                          return;
 110                  }
 111          }
 112 }
 113
 114 /** Returns the locally connected server we must route a
 115  * message through to reach server 'ServerName'. This
 116  * only applies to one-to-one and not one-to-many routing.
 117  * See the comments for the constructor of TreeServer
 118  * for more details.
 119  */
 120 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
 121 {
 122         if (ServerName.c_str() == TreeRoot->GetName() || ServerName == ServerInstance->Config->GetSID())
 123                 return NULL;
 124         TreeServer* Found = FindServer(ServerName);
 125         if (Found)
 126         {
 127                 return Found->GetRoute();
 128         }
 129         else
 130         {
 131                 return NULL;
 132         }
 133 }
 134
 135 /** Find the first server matching a given glob mask.
 136  * Theres no find-using-glob method of hash_map [awwww :-(]
 137  * so instead, we iterate over the list using an iterator
 138  * and match each one until we get a hit. Yes its slow,
 139  * deal with it.
 140  */
 141 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 142 {
 143         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 144         {
 145                 if (match(i->first.c_str(),ServerName.c_str()))
 146                         return i->second;
 147         }
 148         return NULL;
 149 }
 150
 151 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 152 {
 153         server_hash::iterator iter = sidlist.find(id);
 154         if (iter != sidlist.end())
 155                 return iter->second;
 156         else
 157                 return NULL;
 158 }
 159
 160 /* A convenient wrapper that returns true if a server exists */
 161 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 162 {
 163         return (FindServer(ServerName) != NULL);
 164 }
 165
 166 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 167 {
 168         Bindings.clear();
 169
 170         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 171
 172         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 173
 174         /* Did we find any modules? */
 175         if (ml)
 176         {
 177                 /* Yes, enumerate them all to find out the hook name */
 178                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 179                 {
 180                         /* Make a request to it for its name, its implementing
 181                          * BufferedSocketHook so we know its safe to do this
 182                          */
 183                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 184                         /* Build a map of them */
 185                         hooks[name.c_str()] = *m;
 186                         hooknames.push_back(name);
 187                 }
 188         }
 189
 190         this->ReadConfiguration(true);
 191 }
 192
 193 SpanningTreeUtilities::~SpanningTreeUtilities()
 194 {
 195         for (unsigned int i = 0; i < Bindings.size(); i++)
 196         {
 197                 ServerInstance->SE->DelFd(Bindings[i]);
 198                 Bindings[i]->Close();
 199         }
 200         while (TreeRoot->ChildCount())
 201         {
 202                 TreeServer* child_server = TreeRoot->GetChild(0);
 203                 if (child_server)
 204                 {
 205                         TreeSocket* sock = child_server->GetSocket();
 206                         ServerInstance->SE->DelFd(sock);
 207                         sock->Close();
 208                 }
 209         }
 210         delete TreeRoot;
 211         ServerInstance->BufferedSocketCull();
 212 }
 213
 214 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 215 {
 216         if (list.find(server) == list.end())
 217                 list[server] = server;
 218 }
 219
 220 /* returns a list of DIRECT servernames for a specific channel */
 221 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 222 {
 223         CUList *ulist;
 224         switch (status)
 225         {
 226                 case '@':
 227                         ulist = c->GetOppedUsers();
 228                 break;
 229                 case '%':
 230                         ulist = c->GetHalfoppedUsers();
 231                 break;
 232                 case '+':
 233                         ulist = c->GetVoicedUsers();
 234                 break;
 235                 default:
 236                         ulist = c->GetUsers();
 237                 break;
 238         }
 239         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 240         {
 241                 if ((i->first->GetFd() < 0) && (exempt_list.find(i->first) == exempt_list.end()))
 242                 {
 243                         TreeServer* best = this->BestRouteTo(i->first->server);
 244                         if (best)
 245                                 AddThisServer(best,list);
 246                 }
 247         }
 248         return;
 249 }
 250
 251 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 252 {
 253         char pfx = 0;
 254         TreeServer* omitroute = this->BestRouteTo(omit);
 255         if ((command == "NOTICE") || (command == "PRIVMSG"))
 256         {
 257                 if (params.size() >= 2)
 258                 {
 259                         /* Prefixes */
 260                         if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
 261                         {
 262                                 pfx = params[0][0];
 263                                 params[0] = params[0].substr(1, params[0].length()-1);
 264                         }
 265                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 266                         {
 267                                 // special routing for private messages/notices
 268                                 User* d = ServerInstance->FindNick(params[0]);
 269                                 if (d)
 270                                 {
 271                                         std::deque<std::string> par;
 272                                         par.push_back(params[0]);
 273                                         par.push_back(":"+params[1]);
 274                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 275                                         return true;
 276                                 }
 277                         }
 278                         else if (*(params[0].c_str()) == '$')
 279                         {
 280                                 std::deque<std::string> par;
 281                                 par.push_back(params[0]);
 282                                 par.push_back(":"+params[1]);
 283                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 284                                 return true;
 285                         }
 286                         else
 287                         {
 288                                 Channel* c = ServerInstance->FindChan(params[0]);
 289                                 User* u = ServerInstance->FindNick(prefix);
 290                                 if (c && u)
 291                                 {
 292                                         CUList elist;
 293                                         TreeServerList list;
 294                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 295                                         GetListOfServersForChannel(c,list,pfx,elist);
 296
 297                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 298                                         {
 299                                                 TreeSocket* Sock = i->second->GetSocket();
 300                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 301                                                 {
 302                                                         Sock->WriteLine(data);
 303                                                 }
 304                                         }
 305                                         return true;
 306                                 }
 307                         }
 308                 }
 309         }
 310         unsigned int items =this->TreeRoot->ChildCount();
 311         for (unsigned int x = 0; x < items; x++)
 312         {
 313                 TreeServer* Route = this->TreeRoot->GetChild(x);
 314                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 315                 {
 316                         TreeSocket* Sock = Route->GetSocket();
 317                         if (Sock)
 318                                 Sock->WriteLine(data);
 319                 }
 320         }
 321         return true;
 322 }
 323
 324 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 325 {
 326         TreeServer* omitroute = this->BestRouteTo(omit);
 327         std::string FullLine = ":" + prefix + " " + command;
 328         unsigned int words = params.size();
 329         for (unsigned int x = 0; x < words; x++)
 330         {
 331                 FullLine = FullLine + " " + params[x];
 332         }
 333         unsigned int items = this->TreeRoot->ChildCount();
 334         for (unsigned int x = 0; x < items; x++)
 335         {
 336                 TreeServer* Route = this->TreeRoot->GetChild(x);
 337                 // Send the line IF:
 338                 // The route has a socket (its a direct connection)
 339                 // The route isnt the one to be omitted
 340                 // The route isnt the path to the one to be omitted
 341                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 342                 {
 343                         TreeSocket* Sock = Route->GetSocket();
 344                         if (Sock)
 345                                 Sock->WriteLine(FullLine);
 346                 }
 347         }
 348         return true;
 349 }
 350
 351 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 352 {
 353         std::string FullLine = ":" + prefix + " " + command;
 354         unsigned int words = params.size();
 355         for (unsigned int x = 0; x < words; x++)
 356         {
 357                 FullLine = FullLine + " " + params[x];
 358         }
 359         unsigned int items = this->TreeRoot->ChildCount();
 360         for (unsigned int x = 0; x < items; x++)
 361         {
 362                 TreeServer* Route = this->TreeRoot->GetChild(x);
 363                 if (Route && Route->GetSocket())
 364                 {
 365                         TreeSocket* Sock = Route->GetSocket();
 366                         if (Sock)
 367                                 Sock->WriteLine(FullLine);
 368                 }
 369         }
 370         return true;
 371 }
 372
 373 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 374 {
 375         std::string spfx = prefix;
 376         std::string scmd = command;
 377         return this->DoOneToMany(spfx, scmd, params);
 378 }
 379
 380 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 381 {
 382         std::string spfx = prefix;
 383         std::string scmd = command;
 384         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 385 }
 386
 387 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 388 {
 389         TreeServer* Route = this->BestRouteTo(target);
 390         if (Route)
 391         {
 392                 std::string FullLine = ":" + prefix + " " + command;
 393                 unsigned int words = params.size();
 394                 for (unsigned int x = 0; x < words; x++)
 395                 {
 396                         FullLine = FullLine + " " + params[x];
 397                 }
 398                 if (Route && Route->GetSocket())
 399                 {
 400                         TreeSocket* Sock = Route->GetSocket();
 401                         if (Sock)
 402                                 Sock->WriteLine(FullLine);
 403                 }
 404                 return true;
 405         }
 406         else
 407         {
 408                 return false;
 409         }
 410 }
 411
 412 void SpanningTreeUtilities::RefreshIPCache()
 413 {
 414         ValidIPs.clear();
 415         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 416         {
 417                 if ((!L->IPAddr.empty()) && (!L->RecvPass.empty()) && (!L->SendPass.empty()) && (!L->Name.empty()) && (L->Port))
 418                 {
 419                         ValidIPs.push_back(L->IPAddr);
 420
 421                         if (L->AllowMask.length())
 422                                 ValidIPs.push_back(L->AllowMask);
 423
 424                         /* Needs resolving */
 425                         bool ipvalid = true;
 426                         QueryType start_type = DNS_QUERY_A;
 427 #ifdef IPV6
 428                         start_type = DNS_QUERY_AAAA;
 429                         if (strchr(L->IPAddr.c_str(),':'))
 430                         {
 431                                 in6_addr n;
 432                                 if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 433                                         ipvalid = false;
 434                         }
 435                         else
 436 #endif
 437                         {
 438                                 in_addr n;
 439                                 if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 440                                         ipvalid = false;
 441                         }
 442                         if (!ipvalid)
 443                         {
 444                                 try
 445                                 {
 446                                         bool cached;
 447                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 448                                         ServerInstance->AddResolver(sr, cached);
 449                                 }
 450                                 catch (...)
 451                                 {
 452                                 }
 453                         }
 454                 }
 455         }
 456 }
 457
 458 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 459 {
 460         ConfigReader* Conf = new ConfigReader(ServerInstance);
 461         if (rebind)
 462         {
 463                 for (unsigned int i = 0; i < Bindings.size(); i++)
 464                 {
 465                         ServerInstance->SE->DelFd(Bindings[i]);
 466                         Bindings[i]->Close();
 467                 }
 468                 ServerInstance->BufferedSocketCull();
 469                 Bindings.clear();
 470
 471                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 472                 {
 473                         std::string Type = Conf->ReadValue("bind","type",j);
 474                         std::string IP = Conf->ReadValue("bind","address",j);
 475                         std::string Port = Conf->ReadValue("bind","port",j);
 476                         std::string transport = Conf->ReadValue("bind","transport",j);
 477                         if (Type == "servers")
 478                         {
 479                                 irc::portparser portrange(Port, false);
 480                                 int portno = -1;
 481                                 while ((portno = portrange.GetToken()))
 482                                 {
 483                                         if (IP == "*")
 484                                                 IP.clear();
 485
 486                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 487                                         {
 488                                                 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?");
 489                                                 break;
 490                                         }
 491
 492                                         TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
 493                                         if (listener->GetState() == I_LISTENING)
 494                                         {
 495                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
 496                                                 Bindings.push_back(listener);
 497                                         }
 498                                         else
 499                                         {
 500                                                 ServerInstance->Log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port: %s:%d: %s",IP.c_str(), portno, strerror(errno));
 501                                                 listener->Close();
 502                                         }
 503                                 }
 504                         }
 505                 }
 506         }
 507         FlatLinks = Conf->ReadFlag("options","flatlinks",0);
 508         HideULines = Conf->ReadFlag("options","hideulines",0);
 509         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 510         EnableTimeSync = Conf->ReadFlag("timesync","enable",0);
 511         MasterTime = Conf->ReadFlag("timesync", "master", 0);
 512         ChallengeResponse = !Conf->ReadFlag("options", "disablehmac", 0);
 513         quiet_bursts = Conf->ReadFlag("options", "quietbursts", 0);
 514         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 515         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 516
 517         if (PingFreq == 0)
 518                 PingFreq = 60;
 519
 520         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 521                 PingWarnTime = 0;
 522
 523         LinkBlocks.clear();
 524         ValidIPs.clear();
 525         for (int j = 0; j < Conf->Enumerate("link"); j++)
 526         {
 527                 Link L;
 528                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 529                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 530                 L.AllowMask = Allow;
 531                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 532                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 533                 L.Port = Conf->ReadInteger("link", "port", j, true);
 534                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 535                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 536                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 537                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 538                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 539                 L.Hook = Conf->ReadValue("link", "transport", j);
 540                 L.Bind = Conf->ReadValue("link", "bind", j);
 541                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 542
 543                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 544                 {
 545                         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.");
 546                         continue;
 547
 548                 }
 549
 550                 L.NextConnectTime = time(NULL) + L.AutoConnect;
 551                 /* Bugfix by brain, do not allow people to enter bad configurations */
 552                 if (L.Name != ServerInstance->Config->ServerName)
 553                 {
 554                         if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 555                         {
 556                                 if (L.Name.find('.') == std::string::npos)
 557                                         throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 558
 559                                 if (L.Name.length() > 64)
 560                                         throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 561
 562                                 ValidIPs.push_back(L.IPAddr);
 563
 564                                 if (Allow.length())
 565                                         ValidIPs.push_back(Allow);
 566
 567                                 /* Needs resolving */
 568                                 bool ipvalid = true;
 569                                 QueryType start_type = DNS_QUERY_A;
 570 #ifdef IPV6
 571                                 start_type = DNS_QUERY_AAAA;
 572                                 if (strchr(L.IPAddr.c_str(),':'))
 573                                 {
 574                                         in6_addr n;
 575                                         if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 576                                                 ipvalid = false;
 577                                 }
 578                                 else
 579                                 {
 580                                         in_addr n;
 581                                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 582                                                 ipvalid = false;
 583                                 }
 584 #else
 585                                 in_addr n;
 586                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 587                                         ipvalid = false;
 588 #endif
 589
 590                                 if (!ipvalid)
 591                                 {
 592                                         try
 593                                         {
 594                                                 bool cached;
 595                                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 596                                                 ServerInstance->AddResolver(sr, cached);
 597                                         }
 598                                         catch (...)
 599                                         {
 600                                         }
 601                                 }
 602
 603                                 LinkBlocks.push_back(L);
 604                         }
 605                         else
 606                         {
 607                                 if (L.IPAddr.empty())
 608                                 {
 609                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', IP address not defined!");
 610                                 }
 611                                 else if (L.RecvPass.empty())
 612                                 {
 613                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 614                                 }
 615                                 else if (L.SendPass.empty())
 616                                 {
 617                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 618                                 }
 619                                 else if (L.Name.empty())
 620                                 {
 621                                         throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 622                                 }
 623                                 else if (!L.Port)
 624                                 {
 625                                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', no port specified!");
 626                                 }
 627                         }
 628                 }
 629                 else
 630                 {
 631                         throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', link tag has the same server name as the local server!");
 632                 }
 633         }
 634         delete Conf;
 635 }
 636
 637 void SpanningTreeUtilities::DoFailOver(Link* x)
 638 {
 639         if (x->FailOver.length())
 640         {
 641                 if (x->FailOver == x->Name)
 642                 {
 643                         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());
 644                         return;
 645                 }
 646                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 647                 if (TryThisOne)
 648                 {
 649                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 650                         if (CheckDupe)
 651                         {
 652                                 ServerInstance->Log(DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 653                         }
 654                         else
 655                         {
 656                                 Creator->RemoteMessage(NULL,"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 657                                 Creator->ConnectServer(TryThisOne);
 658                         }
 659                 }
 660                 else
 661                 {
 662                         Creator->RemoteMessage(NULL,"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 663                 }
 664         }
 665 }
 666
 667 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 668 {
 669         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 670         {
 671                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
 672                 {
 673                         return &(*x);
 674                 }
 675         }
 676         return NULL;
 677 }