src/modules/m_spanningtree/utils.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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 "xline.h"
  19 #include "../transport.h"
  20 #include "socketengine.h"
  21
  22 #include "main.h"
  23 #include "utils.h"
  24 #include "treeserver.h"
  25 #include "link.h"
  26 #include "treesocket.h"
  27 #include "resolvers.h"
  28
  29 /* $ModDep: m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h */
  30
  31 /* Create server sockets off a listener. */
  32 void ServerSocketListener::OnAcceptReady(const std::string &ipconnectedto, int newsock, const std::string &incomingip)
  33 {
  34         bool found = false;
  35         char *ip = (char *)incomingip.c_str(); // XXX ugly cast
  36
  37         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
  38         if (!found)
  39         {
  40                 for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  41                 {
  42                         if (*i == "*" || irc::sockets::MatchCIDR(ip, *i))
  43                         {
  44                                 found = true;
  45                                 break;
  46                         }
  47                 }
  48
  49                 if (!found)
  50                 {
  51                         this->ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", ip);
  52                         ServerInstance->SE->Close(newsock);
  53                         return;
  54                 }
  55         }
  56
  57         if (this->GetIOHook())
  58         {
  59                 this->GetIOHook()->OnRawSocketAccept(newsock, incomingip.c_str(), this->bind_port);
  60         }
  61
  62         /* we don't need a pointer to this, creating it stores it in the necessary places */
  63         new TreeSocket(this->Utils, this->ServerInstance, newsock, ip, this->GetIOHook());
  64         return;
  65 }
  66
  67 /** Yay for fast searches!
  68  * This is hundreds of times faster than recursion
  69  * or even scanning a linked list, especially when
  70  * there are more than a few servers to deal with.
  71  * (read as: lots).
  72  */
  73 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
  74 {
  75         if (this->ServerInstance->IsSID(ServerName))
  76                 return this->FindServerID(ServerName);
  77
  78         server_hash::iterator iter = serverlist.find(ServerName.c_str());
  79         if (iter != serverlist.end())
  80         {
  81                 return iter->second;
  82         }
  83         else
  84         {
  85                 return NULL;
  86         }
  87 }
  88
  89 /** Returns the locally connected server we must route a
  90  * message through to reach server 'ServerName'. This
  91  * only applies to one-to-one and not one-to-many routing.
  92  * See the comments for the constructor of TreeServer
  93  * for more details.
  94  */
  95 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
  96 {
  97         if (ServerName.c_str() == TreeRoot->GetName() || ServerName == ServerInstance->Config->GetSID())
  98                 return NULL;
  99         TreeServer* Found = FindServer(ServerName);
 100         if (Found)
 101         {
 102                 return Found->GetRoute();
 103         }
 104         else
 105         {
 106                 // Cheat a bit. This allows for (better) working versions of routing commands with nick based prefixes, without hassle
 107                 User *u = ServerInstance->FindNick(ServerName);
 108                 if (u)
 109                 {
 110                         Found = FindServer(u->server);
 111                         if (Found)
 112                                 return Found->GetRoute();
 113                 }
 114
 115                 return NULL;
 116         }
 117 }
 118
 119 /** Find the first server matching a given glob mask.
 120  * Theres no find-using-glob method of hash_map [awwww :-(]
 121  * so instead, we iterate over the list using an iterator
 122  * and match each one until we get a hit. Yes its slow,
 123  * deal with it.
 124  */
 125 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 126 {
 127         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 128         {
 129                 if (InspIRCd::Match(i->first,ServerName))
 130                         return i->second;
 131         }
 132         return NULL;
 133 }
 134
 135 TreeServer* SpanningTreeUtilities::FindServerID(const std::string &id)
 136 {
 137         server_hash::iterator iter = sidlist.find(id);
 138         if (iter != sidlist.end())
 139                 return iter->second;
 140         else
 141                 return NULL;
 142 }
 143
 144 /* A convenient wrapper that returns true if a server exists */
 145 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 146 {
 147         return (FindServer(ServerName) != NULL);
 148 }
 149
 150 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
 151 {
 152         Bindings.clear();
 153
 154         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"***** Using SID for hash: %s *****", ServerInstance->Config->GetSID().c_str());
 155
 156         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 157         this->ServerUser = new FakeUser(ServerInstance, TreeRoot->GetID());
 158
 159         this->ReadConfiguration(true);
 160 }
 161
 162 SpanningTreeUtilities::~SpanningTreeUtilities()
 163 {
 164         for (unsigned int i = 0; i < Bindings.size(); i++)
 165         {
 166                 delete Bindings[i];
 167         }
 168
 169         while (TreeRoot->ChildCount())
 170         {
 171                 TreeServer* child_server = TreeRoot->GetChild(0);
 172                 if (child_server)
 173                 {
 174                         TreeSocket* sock = child_server->GetSocket();
 175                         ServerInstance->SE->DelFd(sock);
 176                         sock->Close();
 177                 }
 178         }
 179
 180         // This avoids a collision on reload
 181         ServerUser->uuid = TreeRoot->GetID();
 182         delete TreeRoot;
 183         delete ServerUser;
 184         ServerInstance->BufferedSocketCull();
 185 }
 186
 187 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 188 {
 189         if (list.find(server) == list.end())
 190                 list[server] = server;
 191 }
 192
 193 /* returns a list of DIRECT servernames for a specific channel */
 194 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 195 {
 196         CUList *ulist = c->GetUsers();
 197
 198         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 199         {
 200                 if (IS_LOCAL(i->first))
 201                         continue;
 202
 203                 if (status && !strchr(c->GetAllPrefixChars(i->first), status))
 204                         continue;
 205
 206                 if (exempt_list.find(i->first) == exempt_list.end())
 207                 {
 208                         TreeServer* best = this->BestRouteTo(i->first->server);
 209                         if (best)
 210                                 AddThisServer(best,list);
 211                 }
 212         }
 213         return;
 214 }
 215
 216 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 217 {
 218         char pfx = 0;
 219         TreeServer* omitroute = this->BestRouteTo(omit);
 220         if ((command == "NOTICE") || (command == "PRIVMSG"))
 221         {
 222                 if (params.size() >= 2)
 223                 {
 224                         /* Prefixes */
 225                         if (ServerInstance->Modes->FindPrefix(params[0][0]))
 226                         {
 227                                 pfx = params[0][0];
 228                                 params[0] = params[0].substr(1, params[0].length()-1);
 229                         }
 230                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 231                         {
 232                                 // special routing for private messages/notices
 233                                 User* d = ServerInstance->FindNick(params[0]);
 234                                 if (d)
 235                                 {
 236                                         std::deque<std::string> par;
 237                                         par.push_back(params[0]);
 238                                         par.push_back(":"+params[1]);
 239                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 240                                         return true;
 241                                 }
 242                         }
 243                         else if (*(params[0].c_str()) == '$')
 244                         {
 245                                 std::deque<std::string> par;
 246                                 par.push_back(params[0]);
 247                                 par.push_back(":"+params[1]);
 248                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 249                                 return true;
 250                         }
 251                         else
 252                         {
 253                                 Channel* c = ServerInstance->FindChan(params[0]);
 254                                 User* u = ServerInstance->FindNick(prefix);
 255                                 if (c)
 256                                 {
 257                                         CUList elist;
 258                                         TreeServerList list;
 259                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 260                                         GetListOfServersForChannel(c,list,pfx,elist);
 261
 262                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 263                                         {
 264                                                 TreeSocket* Sock = i->second->GetSocket();
 265                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 266                                                 {
 267                                                         Sock->WriteLine(data);
 268                                                 }
 269                                         }
 270                                         return true;
 271                                 }
 272                         }
 273                 }
 274         }
 275         unsigned int items =this->TreeRoot->ChildCount();
 276         for (unsigned int x = 0; x < items; x++)
 277         {
 278                 TreeServer* Route = this->TreeRoot->GetChild(x);
 279                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 280                 {
 281                         TreeSocket* Sock = Route->GetSocket();
 282                         if (Sock)
 283                                 Sock->WriteLine(data);
 284                 }
 285         }
 286         return true;
 287 }
 288
 289 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 290 {
 291         TreeServer* omitroute = this->BestRouteTo(omit);
 292         std::string FullLine = ":" + prefix + " " + command;
 293         unsigned int words = params.size();
 294         for (unsigned int x = 0; x < words; x++)
 295         {
 296                 FullLine = FullLine + " " + params[x];
 297         }
 298         unsigned int items = this->TreeRoot->ChildCount();
 299         for (unsigned int x = 0; x < items; x++)
 300         {
 301                 TreeServer* Route = this->TreeRoot->GetChild(x);
 302                 // Send the line IF:
 303                 // The route has a socket (its a direct connection)
 304                 // The route isnt the one to be omitted
 305                 // The route isnt the path to the one to be omitted
 306                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 307                 {
 308                         TreeSocket* Sock = Route->GetSocket();
 309                         if (Sock)
 310                                 Sock->WriteLine(FullLine);
 311                 }
 312         }
 313         return true;
 314 }
 315
 316 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 317 {
 318         std::string FullLine = ":" + prefix + " " + command;
 319         unsigned int words = params.size();
 320         for (unsigned int x = 0; x < words; x++)
 321         {
 322                 FullLine = FullLine + " " + params[x];
 323         }
 324         unsigned int items = this->TreeRoot->ChildCount();
 325         for (unsigned int x = 0; x < items; x++)
 326         {
 327                 TreeServer* Route = this->TreeRoot->GetChild(x);
 328                 if (Route && Route->GetSocket())
 329                 {
 330                         TreeSocket* Sock = Route->GetSocket();
 331                         if (Sock)
 332                                 Sock->WriteLine(FullLine);
 333                 }
 334         }
 335         return true;
 336 }
 337
 338 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 339 {
 340         std::string spfx = prefix;
 341         std::string scmd = command;
 342         return this->DoOneToMany(spfx, scmd, params);
 343 }
 344
 345 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 346 {
 347         std::string spfx = prefix;
 348         std::string scmd = command;
 349         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 350 }
 351
 352 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 353 {
 354         TreeServer* Route = this->BestRouteTo(target);
 355         if (Route)
 356         {
 357                 std::string FullLine = ":" + prefix + " " + command;
 358                 unsigned int words = params.size();
 359                 for (unsigned int x = 0; x < words; x++)
 360                 {
 361                         FullLine = FullLine + " " + params[x];
 362                 }
 363                 if (Route && Route->GetSocket())
 364                 {
 365                         TreeSocket* Sock = Route->GetSocket();
 366                         if (Sock)
 367                                 Sock->WriteLine(FullLine);
 368                 }
 369                 return true;
 370         }
 371         else
 372         {
 373                 return false;
 374         }
 375 }
 376
 377 void SpanningTreeUtilities::RefreshIPCache()
 378 {
 379         ValidIPs.clear();
 380         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 381         {
 382                 if (L->IPAddr.empty() || L->RecvPass.empty() || L->SendPass.empty() || L->Name.empty() || !L->Port)
 383                 {
 384                         if (L->Name.empty())
 385                         {
 386                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a malformed link block (all link blocks require a name!)");
 387                         }
 388                         else
 389                         {
 390                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a link block missing recvpass, sendpass, port or ipaddr.");
 391                         }
 392
 393                         /* Invalid link block */
 394                         continue;
 395                 }
 396
 397                 ValidIPs.push_back(L->IPAddr);
 398
 399                 if (L->AllowMask.length())
 400                         ValidIPs.push_back(L->AllowMask);
 401
 402                 /* Needs resolving */
 403                 bool ipvalid = true;
 404                 QueryType start_type = DNS_QUERY_A;
 405 #ifdef IPV6
 406                 start_type = DNS_QUERY_AAAA;
 407                 if (strchr(L->IPAddr.c_str(),':'))
 408                 {
 409                         in6_addr n;
 410                         if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 411                                 ipvalid = false;
 412                 }
 413                 else
 414 #endif
 415                 {
 416                         in_addr n;
 417                         if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 418                                 ipvalid = false;
 419                 }
 420
 421                 if (!ipvalid)
 422                 {
 423                         try
 424                         {
 425                                 bool cached;
 426                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 427                                 ServerInstance->AddResolver(sr, cached);
 428                         }
 429                         catch (...)
 430                         {
 431                         }
 432                 }
 433         }
 434 }
 435
 436 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 437 {
 438         ConfigReader* Conf = new ConfigReader(ServerInstance);
 439
 440         /* We don't need to worry about these being *unloaded* on the fly, only loaded,
 441          * because we 'use' the interface locking the module in memory.
 442          */
 443         hooks.clear();
 444         hooknames.clear();
 445         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 446
 447         /* Did we find any modules? */
 448         if (ml)
 449         {
 450                 /* Yes, enumerate them all to find out the hook name */
 451                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 452                 {
 453                         /* Make a request to it for its name, its implementing
 454                          * BufferedSocketHook so we know its safe to do this
 455                          */
 456                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 457                         /* Build a map of them */
 458                         hooks[name.c_str()] = *m;
 459                         hooknames.push_back(name);
 460                 }
 461         }
 462
 463         if (rebind)
 464         {
 465                 for (unsigned int i = 0; i < Bindings.size(); i++)
 466                 {
 467                         delete Bindings[i];
 468                 }
 469                 ServerInstance->BufferedSocketCull();
 470                 Bindings.clear();
 471
 472                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 473                 {
 474                         std::string Type = Conf->ReadValue("bind","type",j);
 475                         std::string IP = Conf->ReadValue("bind","address",j);
 476                         std::string Port = Conf->ReadValue("bind","port",j);
 477                         std::string transport = Conf->ReadValue("bind","transport",j);
 478                         if (Type == "servers")
 479                         {
 480                                 irc::portparser portrange(Port, false);
 481                                 int portno = -1;
 482
 483                                 if (IP == "*")
 484                                         IP.clear();
 485
 486                                 while ((portno = portrange.GetToken()))
 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                                         ServerSocketListener *listener = new ServerSocketListener(ServerInstance, this, portno, (char *)IP.c_str());
 495                                         if (listener->GetFd() == -1)
 496                                         {
 497                                                 delete listener;
 498                                                 continue;
 499                                         }
 500
 501                                         if (!transport.empty())
 502                                                 listener->AddIOHook(hooks[transport.c_str()]);
 503
 504                                         Bindings.push_back(listener);
 505                                 }
 506                         }
 507                 }
 508         }
 509         FlatLinks = Conf->ReadFlag("security","flatlinks",0);
 510         HideULines = Conf->ReadFlag("security","hideulines",0);
 511         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 512         ChallengeResponse = !Conf->ReadFlag("security", "disablehmac", 0);
 513         quiet_bursts = Conf->ReadFlag("performance", "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.Fingerprint = Conf->ReadValue("link", "fingerprint", j);
 537                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 538                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 539                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 540                 L.Hook = Conf->ReadValue("link", "transport", j);
 541                 L.Bind = Conf->ReadValue("link", "bind", j);
 542                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 543
 544                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 545                 {
 546                         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.");
 547                         continue;
 548
 549                 }
 550
 551                 // Fix: Only trip autoconnects if this wouldn't delay autoconnect..
 552                 if (L.NextConnectTime > ((time_t)(ServerInstance->Time() + L.AutoConnect)))
 553                         L.NextConnectTime = ServerInstance->Time() + L.AutoConnect;
 554
 555                 if (L.Name.find('.') == std::string::npos)
 556                         throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 557
 558                 if (L.Name.length() > 64)
 559                         throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 560
 561                 if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 562                 {
 563                         if (Allow.length())
 564                                 ValidIPs.push_back(Allow);
 565
 566                         ValidIPs.push_back(L.IPAddr);
 567
 568                         /* Needs resolving */
 569                         bool ipvalid = true;
 570                         QueryType start_type = DNS_QUERY_A;
 571 #ifdef IPV6
 572                         start_type = DNS_QUERY_AAAA;
 573                         if (strchr(L.IPAddr.c_str(),':'))
 574                         {
 575                                 in6_addr n;
 576                                 if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 577                                         ipvalid = false;
 578                         }
 579                         else
 580                         {
 581                                 in_addr n;
 582                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 583                                         ipvalid = false;
 584                         }
 585 #else
 586                         in_addr n;
 587                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 588                                 ipvalid = false;
 589 #endif
 590
 591                         if (!ipvalid)
 592                         {
 593                                 try
 594                                 {
 595                                         bool cached;
 596                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 597                                         ServerInstance->AddResolver(sr, cached);
 598                                 }
 599                                 catch (...)
 600                                 {
 601                                 }
 602                         }
 603                 }
 604                 else
 605                 {
 606                         if (L.IPAddr.empty())
 607                         {
 608                                 L.IPAddr = "*";
 609                                 ValidIPs.push_back("*");
 610                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Configuration warning: Link block " + assign(L.Name) + " has no IP defined! This will allow any IP to connect as this server, and MAY not be what you want.");
 611                         }
 612
 613                         if (L.RecvPass.empty())
 614                         {
 615                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 616                         }
 617
 618                         if (L.SendPass.empty())
 619                         {
 620                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 621                         }
 622
 623                         if (L.Name.empty())
 624                         {
 625                                 throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 626                         }
 627
 628                         if (!L.Port)
 629                         {
 630                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Configuration warning: Link block " + assign(L.Name) + " has no port defined, you will not be able to /connect it.");
 631                         }
 632                 }
 633
 634                 LinkBlocks.push_back(L);
 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                         this->ServerInstance->SNO->WriteToSnoMask('l', "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->Logs->Log("m_spanningtree",DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 655                         }
 656                         else
 657                         {
 658                                 this->ServerInstance->SNO->WriteToSnoMask('l', "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                         this->ServerInstance->SNO->WriteToSnoMask('l', "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 (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 674                 {
 675                         return &(*x);
 676                 }
 677         }
 678         return NULL;
 679 }