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 "socket.h"
  16 #include "xline.h"
  17 #include "../transport.h"
  18 #include "socketengine.h"
  19
  20 #include "main.h"
  21 #include "utils.h"
  22 #include "treeserver.h"
  23 #include "link.h"
  24 #include "treesocket.h"
  25 #include "resolvers.h"
  26
  27 /* $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 */
  28
  29 /* Create server sockets off a listener. */
  30 void ServerSocketListener::OnAcceptReady(int newsock)
  31 {
  32         bool found = false;
  33         int port;
  34         std::string incomingip;
  35         irc::sockets::satoap(&client, incomingip, port);
  36         char *ip = const_cast<char*>(incomingip.c_str());
  37
  38         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
  39         if (!found)
  40         {
  41                 for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
  42                 {
  43                         if (*i == "*" || irc::sockets::MatchCIDR(ip, *i))
  44                         {
  45                                 found = true;
  46                                 break;
  47                         }
  48                 }
  49
  50                 if (!found)
  51                 {
  52                         ServerInstance->SNO->WriteToSnoMask('l', "Server connection from %s denied (no link blocks with that IP address)", ip);
  53                         ServerInstance->SE->Close(newsock);
  54                         return;
  55                 }
  56         }
  57
  58         /* we don't need to do anything with the pointer, creating it stores it in the necessary places */
  59         TreeSocket* ts = new TreeSocket(Utils, newsock, ip, NULL, Hook);
  60
  61         if (Hook)
  62                 Hook->OnStreamSocketAccept(ts, &client, &server);
  63
  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 (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(ModuleSpanningTree* C) : Creator(C)
 151 {
 152         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"***** Using SID for hash: %s *****", ServerInstance->Config->GetSID().c_str());
 153
 154         this->TreeRoot = new TreeServer(this, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc, ServerInstance->Config->GetSID());
 155         ServerUser = new FakeUser(TreeRoot->GetID());
 156
 157         this->ReadConfiguration(true);
 158 }
 159
 160 void SpanningTreeUtilities::cull()
 161 {
 162         for (unsigned int i = 0; i < Bindings.size(); i++)
 163         {
 164                 Bindings[i]->cull();
 165         }
 166
 167         while (TreeRoot->ChildCount())
 168         {
 169                 TreeServer* child_server = TreeRoot->GetChild(0);
 170                 if (child_server)
 171                 {
 172                         TreeSocket* sock = child_server->GetSocket();
 173                         sock->Close();
 174                 }
 175         }
 176
 177         ServerUser->uuid = TreeRoot->GetID();
 178         ServerUser->cull();
 179 }
 180
 181 SpanningTreeUtilities::~SpanningTreeUtilities()
 182 {
 183         for (unsigned int i = 0; i < Bindings.size(); i++)
 184         {
 185                 delete Bindings[i];
 186         }
 187
 188         delete TreeRoot;
 189         delete ServerUser;
 190 }
 191
 192 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 193 {
 194         if (list.find(server) == list.end())
 195                 list[server] = server;
 196 }
 197
 198 /* returns a list of DIRECT servernames for a specific channel */
 199 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 200 {
 201         const UserMembList *ulist = c->GetUsers();
 202
 203         for (UserMembCIter i = ulist->begin(); i != ulist->end(); i++)
 204         {
 205                 if (IS_LOCAL(i->first))
 206                         continue;
 207
 208                 if (status && !strchr(c->GetAllPrefixChars(i->first), status))
 209                         continue;
 210
 211                 if (exempt_list.find(i->first) == exempt_list.end())
 212                 {
 213                         TreeServer* best = this->BestRouteTo(i->first->server);
 214                         if (best)
 215                                 AddThisServer(best,list);
 216                 }
 217         }
 218         return;
 219 }
 220
 221 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, parameterlist &params)
 222 {
 223         char pfx = 0;
 224         TreeServer* omitroute = this->BestRouteTo(omit);
 225         if ((command == "NOTICE") || (command == "PRIVMSG"))
 226         {
 227                 if (params.size() >= 2)
 228                 {
 229                         /* Prefixes */
 230                         if (ServerInstance->Modes->FindPrefix(params[0][0]))
 231                         {
 232                                 pfx = params[0][0];
 233                                 params[0] = params[0].substr(1, params[0].length()-1);
 234                         }
 235                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 236                         {
 237                                 // special routing for private messages/notices
 238                                 User* d = ServerInstance->FindNick(params[0]);
 239                                 if (d)
 240                                 {
 241                                         parameterlist par;
 242                                         par.push_back(params[0]);
 243                                         par.push_back(":"+params[1]);
 244                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 245                                         return true;
 246                                 }
 247                         }
 248                         else if (*(params[0].c_str()) == '$')
 249                         {
 250                                 parameterlist par;
 251                                 par.push_back(params[0]);
 252                                 par.push_back(":"+params[1]);
 253                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 254                                 return true;
 255                         }
 256                         else
 257                         {
 258                                 Channel* c = ServerInstance->FindChan(params[0]);
 259                                 User* u = ServerInstance->FindNick(prefix);
 260                                 if (c)
 261                                 {
 262                                         CUList elist;
 263                                         TreeServerList list;
 264                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 265                                         GetListOfServersForChannel(c,list,pfx,elist);
 266
 267                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 268                                         {
 269                                                 TreeSocket* Sock = i->second->GetSocket();
 270                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 271                                                 {
 272                                                         Sock->WriteLine(data);
 273                                                 }
 274                                         }
 275                                         return true;
 276                                 }
 277                         }
 278                 }
 279         }
 280         unsigned int items =this->TreeRoot->ChildCount();
 281         for (unsigned int x = 0; x < items; x++)
 282         {
 283                 TreeServer* Route = this->TreeRoot->GetChild(x);
 284                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 285                 {
 286                         TreeSocket* Sock = Route->GetSocket();
 287                         if (Sock)
 288                                 Sock->WriteLine(data);
 289                 }
 290         }
 291         return true;
 292 }
 293
 294 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, parameterlist &params, std::string omit)
 295 {
 296         TreeServer* omitroute = this->BestRouteTo(omit);
 297         std::string FullLine = ":" + prefix + " " + command;
 298         unsigned int words = params.size();
 299         for (unsigned int x = 0; x < words; x++)
 300         {
 301                 FullLine = FullLine + " " + params[x];
 302         }
 303         unsigned int items = this->TreeRoot->ChildCount();
 304         for (unsigned int x = 0; x < items; x++)
 305         {
 306                 TreeServer* Route = this->TreeRoot->GetChild(x);
 307                 // Send the line IF:
 308                 // The route has a socket (its a direct connection)
 309                 // The route isnt the one to be omitted
 310                 // The route isnt the path to the one to be omitted
 311                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 312                 {
 313                         TreeSocket* Sock = Route->GetSocket();
 314                         if (Sock)
 315                                 Sock->WriteLine(FullLine);
 316                 }
 317         }
 318         return true;
 319 }
 320
 321 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, parameterlist &params)
 322 {
 323         std::string FullLine = ":" + prefix + " " + command;
 324         unsigned int words = params.size();
 325         for (unsigned int x = 0; x < words; x++)
 326         {
 327                 FullLine = FullLine + " " + params[x];
 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())
 334                 {
 335                         TreeSocket* Sock = Route->GetSocket();
 336                         if (Sock)
 337                                 Sock->WriteLine(FullLine);
 338                 }
 339         }
 340         return true;
 341 }
 342
 343 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, parameterlist &params)
 344 {
 345         std::string spfx = prefix;
 346         std::string scmd = command;
 347         return this->DoOneToMany(spfx, scmd, params);
 348 }
 349
 350 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, parameterlist &params, std::string omit)
 351 {
 352         std::string spfx = prefix;
 353         std::string scmd = command;
 354         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 355 }
 356
 357 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, parameterlist &params, std::string target)
 358 {
 359         TreeServer* Route = this->BestRouteTo(target);
 360         if (Route)
 361         {
 362                 std::string FullLine = ":" + prefix + " " + command;
 363                 unsigned int words = params.size();
 364                 for (unsigned int x = 0; x < words; x++)
 365                 {
 366                         FullLine = FullLine + " " + params[x];
 367                 }
 368                 if (Route && Route->GetSocket())
 369                 {
 370                         TreeSocket* Sock = Route->GetSocket();
 371                         if (Sock)
 372                                 Sock->WriteLine(FullLine);
 373                 }
 374                 return true;
 375         }
 376         else
 377         {
 378                 return false;
 379         }
 380 }
 381
 382 void SpanningTreeUtilities::RefreshIPCache()
 383 {
 384         ValidIPs.clear();
 385         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 386         {
 387                 if (L->IPAddr.empty() || L->RecvPass.empty() || L->SendPass.empty() || L->Name.empty() || !L->Port)
 388                 {
 389                         if (L->Name.empty())
 390                         {
 391                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a malformed link block (all link blocks require a name!)");
 392                         }
 393                         else
 394                         {
 395                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a link block missing recvpass, sendpass, port or ipaddr.");
 396                         }
 397
 398                         /* Invalid link block */
 399                         continue;
 400                 }
 401
 402                 ValidIPs.push_back(L->IPAddr);
 403
 404                 if (L->AllowMask.length())
 405                         ValidIPs.push_back(L->AllowMask);
 406
 407                 /* Needs resolving */
 408                 bool ipvalid = true;
 409                 QueryType start_type = DNS_QUERY_A;
 410                 start_type = DNS_QUERY_AAAA;
 411                 if (strchr(L->IPAddr.c_str(),':'))
 412                 {
 413                         in6_addr n;
 414                         if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 415                                 ipvalid = false;
 416                 }
 417                 else
 418                 {
 419                         in_addr n;
 420                         if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 421                                 ipvalid = false;
 422                 }
 423
 424                 if (!ipvalid)
 425                 {
 426                         try
 427                         {
 428                                 bool cached;
 429                                 SecurityIPResolver* sr = new SecurityIPResolver(Creator, this, L->IPAddr, *L, cached, start_type);
 430                                 ServerInstance->AddResolver(sr, cached);
 431                         }
 432                         catch (...)
 433                         {
 434                         }
 435                 }
 436         }
 437 }
 438
 439 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 440 {
 441         ConfigReader* Conf = new ConfigReader;
 442
 443         /* We don't need to worry about these being *unloaded* on the fly, only loaded,
 444          * because we 'use' the interface locking the module in memory.
 445          */
 446         hooks.clear();
 447         hooknames.clear();
 448         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 449
 450         /* Did we find any modules? */
 451         if (ml)
 452         {
 453                 /* Yes, enumerate them all to find out the hook name */
 454                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 455                 {
 456                         /* Make a request to it for its name, its implementing
 457                          * BufferedSocketHook so we know its safe to do this
 458                          */
 459                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 460                         /* Build a map of them */
 461                         hooks[name.c_str()] = *m;
 462                         hooknames.push_back(name);
 463                 }
 464         }
 465
 466         if (rebind)
 467         {
 468                 for (unsigned int i = 0; i < Bindings.size(); i++)
 469                 {
 470                         delete Bindings[i];
 471                 }
 472                 Bindings.clear();
 473
 474                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 475                 {
 476                         std::string Type = Conf->ReadValue("bind","type",j);
 477                         std::string IP = Conf->ReadValue("bind","address",j);
 478                         std::string Port = Conf->ReadValue("bind","port",j);
 479                         std::string transport = Conf->ReadValue("bind","transport",j);
 480                         if (Type == "servers")
 481                         {
 482                                 irc::portparser portrange(Port, false);
 483                                 int portno = -1;
 484
 485                                 if (IP == "*")
 486                                         IP.clear();
 487
 488                                 while ((portno = portrange.GetToken()))
 489                                 {
 490                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 491                                         {
 492                                                 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?");
 493                                                 break;
 494                                         }
 495
 496                                         ServerSocketListener *listener = new ServerSocketListener(this, portno, (char *)IP.c_str());
 497                                         if (listener->GetFd() == -1)
 498                                         {
 499                                                 delete listener;
 500                                                 continue;
 501                                         }
 502
 503                                         if (!transport.empty())
 504                                                 listener->Hook = hooks[transport.c_str()];
 505
 506                                         Bindings.push_back(listener);
 507                                 }
 508                         }
 509                 }
 510         }
 511         FlatLinks = Conf->ReadFlag("security","flatlinks",0);
 512         HideULines = Conf->ReadFlag("security","hideulines",0);
 513         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 514         AllowOptCommon = Conf->ReadFlag("options", "allowmismatch", 0);
 515         ChallengeResponse = !Conf->ReadFlag("security", "disablehmac", 0);
 516         quiet_bursts = Conf->ReadFlag("performance", "quietbursts", 0);
 517         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 518         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 519
 520         if (PingFreq == 0)
 521                 PingFreq = 60;
 522
 523         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 524                 PingWarnTime = 0;
 525
 526         AutoconnectBlocks.clear();
 527         LinkBlocks.clear();
 528         ValidIPs.clear();
 529         for (int j = 0; j < Conf->Enumerate("link"); ++j)
 530         {
 531                 Link L;
 532                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 533                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 534                 L.AllowMask = Allow;
 535                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 536                 L.Port = Conf->ReadInteger("link", "port", j, true);
 537                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 538                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 539                 L.Fingerprint = Conf->ReadValue("link", "fingerprint", j);
 540                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 541                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 542                 L.Hook = Conf->ReadValue("link", "transport", j);
 543                 L.Bind = Conf->ReadValue("link", "bind", j);
 544                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 545
 546                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 547                 {
 548                         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.");
 549                         continue;
 550
 551                 }
 552
 553                 if (L.Name.find('.') == std::string::npos)
 554                         throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 555
 556                 if (L.Name.length() > 64)
 557                         throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 558
 559                 if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 560                 {
 561                         if (Allow.length())
 562                                 ValidIPs.push_back(Allow);
 563
 564                         ValidIPs.push_back(L.IPAddr);
 565
 566                         /* Needs resolving */
 567                         bool ipvalid = true;
 568                         QueryType start_type = DNS_QUERY_A;
 569                         start_type = DNS_QUERY_AAAA;
 570                         if (strchr(L.IPAddr.c_str(),':'))
 571                         {
 572                                 in6_addr n;
 573                                 if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 574                                         ipvalid = false;
 575                         }
 576                         else
 577                         {
 578                                 in_addr n;
 579                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 580                                         ipvalid = false;
 581                         }
 582
 583                         if (!ipvalid)
 584                         {
 585                                 try
 586                                 {
 587                                         bool cached;
 588                                         SecurityIPResolver* sr = new SecurityIPResolver(Creator, this, L.IPAddr, L, cached, start_type);
 589                                         ServerInstance->AddResolver(sr, cached);
 590                                 }
 591                                 catch (...)
 592                                 {
 593                                 }
 594                         }
 595                 }
 596                 else
 597                 {
 598                         if (L.IPAddr.empty())
 599                         {
 600                                 L.IPAddr = "*";
 601                                 ValidIPs.push_back("*");
 602                                 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.");
 603                         }
 604
 605                         if (L.RecvPass.empty())
 606                         {
 607                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 608                         }
 609
 610                         if (L.SendPass.empty())
 611                         {
 612                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 613                         }
 614
 615                         if (L.Name.empty())
 616                         {
 617                                 throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 618                         }
 619
 620                         if (!L.Port)
 621                         {
 622                                 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.");
 623                         }
 624                 }
 625
 626                 LinkBlocks.push_back(L);
 627         }
 628
 629         for (int j = 0; j < Conf->Enumerate("autoconnect"); ++j)
 630         {
 631                 Autoconnect A;
 632                 A.Period = Conf->ReadInteger("autoconnect", "period", j, true);
 633                 A.Server = Conf->ReadValue("autoconnect", "server", j);
 634                 A.FailOver = Conf->ReadValue("autoconnect", "failover", j).c_str();
 635
 636                 // Fix: Only trip autoconnects if this wouldn't delay autoconnect..
 637                 if (A.NextConnectTime > ((time_t)(ServerInstance->Time() + A.Period)))
 638                         A.NextConnectTime = ServerInstance->Time() + A.Period;
 639
 640                 if (A.Period <= 0)
 641                 {
 642                         throw CoreException("Invalid configuration for autoconnect, period not a positive integer!");
 643                 }
 644
 645                 if (A.Server.empty())
 646                 {
 647                         throw CoreException("Invalid configuration for autoconnect, server cannot be empty!");
 648                 }
 649
 650                 AutoconnectBlocks.push_back(A);
 651         }
 652
 653         delete Conf;
 654 }
 655
 656 void SpanningTreeUtilities::DoFailOver(Autoconnect* x)
 657 {
 658         if (x && x->FailOver.length())
 659         {
 660                 if (x->FailOver == x->Server)
 661                 {
 662                         ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Some muppet configured the failover for server \002%s\002 to point at itself. Not following it!", x->Server.c_str());
 663                         return;
 664                 }
 665                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 666                 if (TryThisOne)
 667                 {
 668                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 669                         if (CheckDupe)
 670                         {
 671                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 672                         }
 673                         else
 674                         {
 675                                 ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Server.c_str(), TryThisOne->Name.c_str());
 676                                 Creator->ConnectServer(TryThisOne, NULL);
 677                         }
 678                 }
 679                 else
 680                 {
 681                         ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Server.c_str());
 682                 }
 683         }
 684 }
 685
 686 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 687 {
 688         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x != LinkBlocks.end(); x++)
 689         {
 690                 if (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 691                 {
 692                         return &(*x);
 693                 }
 694         }
 695         return NULL;
 696 }