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 "m_spanningtree/main.h"
  23 #include "m_spanningtree/utils.h"
  24 #include "m_spanningtree/treeserver.h"
  25 #include "m_spanningtree/link.h"
  26 #include "m_spanningtree/treesocket.h"
  27 #include "m_spanningtree/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         delete TreeRoot;
 180         delete ServerUser;
 181         ServerInstance->BufferedSocketCull();
 182 }
 183
 184 void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
 185 {
 186         if (list.find(server) == list.end())
 187                 list[server] = server;
 188 }
 189
 190 /* returns a list of DIRECT servernames for a specific channel */
 191 void SpanningTreeUtilities::GetListOfServersForChannel(Channel* c, TreeServerList &list, char status, const CUList &exempt_list)
 192 {
 193         CUList *ulist = c->GetUsers();
 194
 195         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 196         {
 197                 if (IS_LOCAL(i->first))
 198                         continue;
 199
 200                 if (status && !strchr(c->GetAllPrefixChars(i->first), status))
 201                         continue;
 202
 203                 if (exempt_list.find(i->first) == exempt_list.end())
 204                 {
 205                         TreeServer* best = this->BestRouteTo(i->first->server);
 206                         if (best)
 207                                 AddThisServer(best,list);
 208                 }
 209         }
 210         return;
 211 }
 212
 213 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
 214 {
 215         char pfx = 0;
 216         TreeServer* omitroute = this->BestRouteTo(omit);
 217         if ((command == "NOTICE") || (command == "PRIVMSG"))
 218         {
 219                 if (params.size() >= 2)
 220                 {
 221                         /* Prefixes */
 222                         if (ServerInstance->Modes->FindPrefix(params[0][0]))
 223                         {
 224                                 pfx = params[0][0];
 225                                 params[0] = params[0].substr(1, params[0].length()-1);
 226                         }
 227                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
 228                         {
 229                                 // special routing for private messages/notices
 230                                 User* d = ServerInstance->FindNick(params[0]);
 231                                 if (d)
 232                                 {
 233                                         std::deque<std::string> par;
 234                                         par.push_back(params[0]);
 235                                         par.push_back(":"+params[1]);
 236                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
 237                                         return true;
 238                                 }
 239                         }
 240                         else if (*(params[0].c_str()) == '$')
 241                         {
 242                                 std::deque<std::string> par;
 243                                 par.push_back(params[0]);
 244                                 par.push_back(":"+params[1]);
 245                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
 246                                 return true;
 247                         }
 248                         else
 249                         {
 250                                 Channel* c = ServerInstance->FindChan(params[0]);
 251                                 User* u = ServerInstance->FindNick(prefix);
 252                                 if (c)
 253                                 {
 254                                         CUList elist;
 255                                         TreeServerList list;
 256                                         FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist, params[1]));
 257                                         GetListOfServersForChannel(c,list,pfx,elist);
 258
 259                                         for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
 260                                         {
 261                                                 TreeSocket* Sock = i->second->GetSocket();
 262                                                 if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
 263                                                 {
 264                                                         Sock->WriteLine(data);
 265                                                 }
 266                                         }
 267                                         return true;
 268                                 }
 269                         }
 270                 }
 271         }
 272         unsigned int items =this->TreeRoot->ChildCount();
 273         for (unsigned int x = 0; x < items; x++)
 274         {
 275                 TreeServer* Route = this->TreeRoot->GetChild(x);
 276                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 277                 {
 278                         TreeSocket* Sock = Route->GetSocket();
 279                         if (Sock)
 280                                 Sock->WriteLine(data);
 281                 }
 282         }
 283         return true;
 284 }
 285
 286 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
 287 {
 288         TreeServer* omitroute = this->BestRouteTo(omit);
 289         std::string FullLine = ":" + prefix + " " + command;
 290         unsigned int words = params.size();
 291         for (unsigned int x = 0; x < words; x++)
 292         {
 293                 FullLine = FullLine + " " + params[x];
 294         }
 295         unsigned int items = this->TreeRoot->ChildCount();
 296         for (unsigned int x = 0; x < items; x++)
 297         {
 298                 TreeServer* Route = this->TreeRoot->GetChild(x);
 299                 // Send the line IF:
 300                 // The route has a socket (its a direct connection)
 301                 // The route isnt the one to be omitted
 302                 // The route isnt the path to the one to be omitted
 303                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
 304                 {
 305                         TreeSocket* Sock = Route->GetSocket();
 306                         if (Sock)
 307                                 Sock->WriteLine(FullLine);
 308                 }
 309         }
 310         return true;
 311 }
 312
 313 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
 314 {
 315         std::string FullLine = ":" + prefix + " " + command;
 316         unsigned int words = params.size();
 317         for (unsigned int x = 0; x < words; x++)
 318         {
 319                 FullLine = FullLine + " " + params[x];
 320         }
 321         unsigned int items = this->TreeRoot->ChildCount();
 322         for (unsigned int x = 0; x < items; x++)
 323         {
 324                 TreeServer* Route = this->TreeRoot->GetChild(x);
 325                 if (Route && Route->GetSocket())
 326                 {
 327                         TreeSocket* Sock = Route->GetSocket();
 328                         if (Sock)
 329                                 Sock->WriteLine(FullLine);
 330                 }
 331         }
 332         return true;
 333 }
 334
 335 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
 336 {
 337         std::string spfx = prefix;
 338         std::string scmd = command;
 339         return this->DoOneToMany(spfx, scmd, params);
 340 }
 341
 342 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
 343 {
 344         std::string spfx = prefix;
 345         std::string scmd = command;
 346         return this->DoOneToAllButSender(spfx, scmd, params, omit);
 347 }
 348
 349 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
 350 {
 351         TreeServer* Route = this->BestRouteTo(target);
 352         if (Route)
 353         {
 354                 std::string FullLine = ":" + prefix + " " + command;
 355                 unsigned int words = params.size();
 356                 for (unsigned int x = 0; x < words; x++)
 357                 {
 358                         FullLine = FullLine + " " + params[x];
 359                 }
 360                 if (Route && Route->GetSocket())
 361                 {
 362                         TreeSocket* Sock = Route->GetSocket();
 363                         if (Sock)
 364                                 Sock->WriteLine(FullLine);
 365                 }
 366                 return true;
 367         }
 368         else
 369         {
 370                 return false;
 371         }
 372 }
 373
 374 void SpanningTreeUtilities::RefreshIPCache()
 375 {
 376         ValidIPs.clear();
 377         for (std::vector<Link>::iterator L = LinkBlocks.begin(); L != LinkBlocks.end(); L++)
 378         {
 379                 if (L->IPAddr.empty() || L->RecvPass.empty() || L->SendPass.empty() || L->Name.empty() || !L->Port)
 380                 {
 381                         if (L->Name.empty())
 382                         {
 383                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a malformed link block (all link blocks require a name!)");
 384                         }
 385                         else
 386                         {
 387                                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"m_spanningtree: Ignoring a link block missing recvpass, sendpass, port or ipaddr.");
 388                         }
 389
 390                         /* Invalid link block */
 391                         continue;
 392                 }
 393
 394                 ValidIPs.push_back(L->IPAddr);
 395
 396                 if (L->AllowMask.length())
 397                         ValidIPs.push_back(L->AllowMask);
 398
 399                 /* Needs resolving */
 400                 bool ipvalid = true;
 401                 QueryType start_type = DNS_QUERY_A;
 402 #ifdef IPV6
 403                 start_type = DNS_QUERY_AAAA;
 404                 if (strchr(L->IPAddr.c_str(),':'))
 405                 {
 406                         in6_addr n;
 407                         if (inet_pton(AF_INET6, L->IPAddr.c_str(), &n) < 1)
 408                                 ipvalid = false;
 409                 }
 410                 else
 411 #endif
 412                 {
 413                         in_addr n;
 414                         if (inet_aton(L->IPAddr.c_str(),&n) < 1)
 415                                 ipvalid = false;
 416                 }
 417
 418                 if (!ipvalid)
 419                 {
 420                         try
 421                         {
 422                                 bool cached;
 423                                 SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L->IPAddr, *L, cached, start_type);
 424                                 ServerInstance->AddResolver(sr, cached);
 425                         }
 426                         catch (...)
 427                         {
 428                         }
 429                 }
 430         }
 431 }
 432
 433 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
 434 {
 435         ConfigReader* Conf = new ConfigReader(ServerInstance);
 436
 437         /* We don't need to worry about these being *unloaded* on the fly, only loaded,
 438          * because we 'use' the interface locking the module in memory.
 439          */
 440         hooks.clear();
 441         hooknames.clear();
 442         modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
 443
 444         /* Did we find any modules? */
 445         if (ml)
 446         {
 447                 /* Yes, enumerate them all to find out the hook name */
 448                 for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
 449                 {
 450                         /* Make a request to it for its name, its implementing
 451                          * BufferedSocketHook so we know its safe to do this
 452                          */
 453                         std::string name = BufferedSocketNameRequest((Module*)Creator, *m).Send();
 454                         /* Build a map of them */
 455                         hooks[name.c_str()] = *m;
 456                         hooknames.push_back(name);
 457                 }
 458         }
 459
 460         if (rebind)
 461         {
 462                 for (unsigned int i = 0; i < Bindings.size(); i++)
 463                 {
 464                         delete Bindings[i];
 465                 }
 466                 ServerInstance->BufferedSocketCull();
 467                 Bindings.clear();
 468
 469                 for (int j = 0; j < Conf->Enumerate("bind"); j++)
 470                 {
 471                         std::string Type = Conf->ReadValue("bind","type",j);
 472                         std::string IP = Conf->ReadValue("bind","address",j);
 473                         std::string Port = Conf->ReadValue("bind","port",j);
 474                         std::string transport = Conf->ReadValue("bind","transport",j);
 475                         if (Type == "servers")
 476                         {
 477                                 irc::portparser portrange(Port, false);
 478                                 int portno = -1;
 479
 480                                 if (IP == "*")
 481                                         IP.clear();
 482
 483                                 while ((portno = portrange.GetToken()))
 484                                 {
 485                                         if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
 486                                         {
 487                                                 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?");
 488                                                 break;
 489                                         }
 490
 491                                         ServerSocketListener *listener = new ServerSocketListener(ServerInstance, this, portno, (char *)IP.c_str());
 492                                         if (listener->GetFd() == -1)
 493                                         {
 494                                                 delete listener;
 495                                                 continue;
 496                                         }
 497
 498                                         if (!transport.empty())
 499                                                 listener->AddIOHook(hooks[transport.c_str()]);
 500
 501                                         Bindings.push_back(listener);
 502                                 }
 503                         }
 504                 }
 505         }
 506         FlatLinks = Conf->ReadFlag("security","flatlinks",0);
 507         HideULines = Conf->ReadFlag("security","hideulines",0);
 508         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
 509         ChallengeResponse = !Conf->ReadFlag("security", "disablehmac", 0);
 510         quiet_bursts = Conf->ReadFlag("performance", "quietbursts", 0);
 511         PingWarnTime = Conf->ReadInteger("options", "pingwarning", 0, true);
 512         PingFreq = Conf->ReadInteger("options", "serverpingfreq", 0, true);
 513
 514         if (PingFreq == 0)
 515                 PingFreq = 60;
 516
 517         if (PingWarnTime < 0 || PingWarnTime > PingFreq - 1)
 518                 PingWarnTime = 0;
 519
 520         LinkBlocks.clear();
 521         ValidIPs.clear();
 522         for (int j = 0; j < Conf->Enumerate("link"); j++)
 523         {
 524                 Link L;
 525                 std::string Allow = Conf->ReadValue("link", "allowmask", j);
 526                 L.Name = (Conf->ReadValue("link", "name", j)).c_str();
 527                 L.AllowMask = Allow;
 528                 L.IPAddr = Conf->ReadValue("link", "ipaddr", j);
 529                 L.FailOver = Conf->ReadValue("link", "failover", j).c_str();
 530                 L.Port = Conf->ReadInteger("link", "port", j, true);
 531                 L.SendPass = Conf->ReadValue("link", "sendpass", j);
 532                 L.RecvPass = Conf->ReadValue("link", "recvpass", j);
 533                 L.AutoConnect = Conf->ReadInteger("link", "autoconnect", j, true);
 534                 L.HiddenFromStats = Conf->ReadFlag("link", "statshidden", j);
 535                 L.Timeout = Conf->ReadInteger("link", "timeout", j, true);
 536                 L.Hook = Conf->ReadValue("link", "transport", j);
 537                 L.Bind = Conf->ReadValue("link", "bind", j);
 538                 L.Hidden = Conf->ReadFlag("link", "hidden", j);
 539
 540                 if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
 541                 {
 542                         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.");
 543                         continue;
 544
 545                 }
 546
 547                 // Fix: Only trip autoconnects if this wouldn't delay autoconnect..
 548                 if (L.NextConnectTime > ((time_t)(ServerInstance->Time() + L.AutoConnect)))
 549                         L.NextConnectTime = ServerInstance->Time() + L.AutoConnect;
 550
 551                 if (L.Name.find('.') == std::string::npos)
 552                         throw CoreException("The link name '"+assign(L.Name)+"' is invalid and must contain at least one '.' character");
 553
 554                 if (L.Name.length() > 64)
 555                         throw CoreException("The link name '"+assign(L.Name)+"' is longer than 64 characters!");
 556
 557                 if ((!L.IPAddr.empty()) && (!L.RecvPass.empty()) && (!L.SendPass.empty()) && (!L.Name.empty()) && (L.Port))
 558                 {
 559                         if (Allow.length())
 560                                 ValidIPs.push_back(Allow);
 561
 562                         ValidIPs.push_back(L.IPAddr);
 563
 564                         /* Needs resolving */
 565                         bool ipvalid = true;
 566                         QueryType start_type = DNS_QUERY_A;
 567 #ifdef IPV6
 568                         start_type = DNS_QUERY_AAAA;
 569                         if (strchr(L.IPAddr.c_str(),':'))
 570                         {
 571                                 in6_addr n;
 572                                 if (inet_pton(AF_INET6, L.IPAddr.c_str(), &n) < 1)
 573                                         ipvalid = false;
 574                         }
 575                         else
 576                         {
 577                                 in_addr n;
 578                                 if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 579                                         ipvalid = false;
 580                         }
 581 #else
 582                         in_addr n;
 583                         if (inet_aton(L.IPAddr.c_str(),&n) < 1)
 584                                 ipvalid = false;
 585 #endif
 586
 587                         if (!ipvalid)
 588                         {
 589                                 try
 590                                 {
 591                                         bool cached;
 592                                         SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L, cached, start_type);
 593                                         ServerInstance->AddResolver(sr, cached);
 594                                 }
 595                                 catch (...)
 596                                 {
 597                                 }
 598                         }
 599                 }
 600                 else
 601                 {
 602                         if (L.IPAddr.empty())
 603                         {
 604                                 L.IPAddr = "*";
 605                                 ValidIPs.push_back("*");
 606                                 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.");
 607                         }
 608
 609                         if (L.RecvPass.empty())
 610                         {
 611                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', recvpass not defined!");
 612                         }
 613
 614                         if (L.SendPass.empty())
 615                         {
 616                                 throw CoreException("Invalid configuration for server '"+assign(L.Name)+"', sendpass not defined!");
 617                         }
 618
 619                         if (L.Name.empty())
 620                         {
 621                                 throw CoreException("Invalid configuration, link tag without a name! IP address: "+L.IPAddr);
 622                         }
 623
 624                         if (!L.Port)
 625                         {
 626                                 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.");
 627                         }
 628                 }
 629
 630                 LinkBlocks.push_back(L);
 631         }
 632         delete Conf;
 633 }
 634
 635 void SpanningTreeUtilities::DoFailOver(Link* x)
 636 {
 637         if (x->FailOver.length())
 638         {
 639                 if (x->FailOver == x->Name)
 640                 {
 641                         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());
 642                         return;
 643                 }
 644                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
 645                 if (TryThisOne)
 646                 {
 647                         TreeServer* CheckDupe = this->FindServer(x->FailOver.c_str());
 648                         if (CheckDupe)
 649                         {
 650                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Skipping existing failover: %s", x->FailOver.c_str());
 651                         }
 652                         else
 653                         {
 654                                 this->ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
 655                                 Creator->ConnectServer(TryThisOne);
 656                         }
 657                 }
 658                 else
 659                 {
 660                         this->ServerInstance->SNO->WriteToSnoMask('l', "FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
 661                 }
 662         }
 663 }
 664
 665 Link* SpanningTreeUtilities::FindLink(const std::string& name)
 666 {
 667         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x != LinkBlocks.end(); x++)
 668         {
 669                 if (InspIRCd::Match(x->Name.c_str(), name.c_str()))
 670                 {
 671                         return &(*x);
 672                 }
 673         }
 674         return NULL;
 675 }