src/modules/m_spanningtree/main.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2009 Craig Edwards <craigedwards@brainbox.cc>
   6  *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
   7  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   8  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   9  *
  10  * This file is part of InspIRCd.  InspIRCd is free software: you can
  11  * redistribute it and/or modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation, version 2.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  16  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23
  24 #include "inspircd.h"
  25 #include "socket.h"
  26 #include "xline.h"
  27 #include "iohook.h"
  28 #include "modules/server.h"
  29
  30 #include "resolvers.h"
  31 #include "main.h"
  32 #include "utils.h"
  33 #include "treeserver.h"
  34 #include "link.h"
  35 #include "treesocket.h"
  36 #include "commands.h"
  37 #include "translate.h"
  38
  39 ModuleSpanningTree::ModuleSpanningTree()
  40         : Away::EventListener(this)
  41         , Stats::EventListener(this)
  42         , rconnect(this)
  43         , rsquit(this)
  44         , map(this)
  45         , commands(this)
  46         , currmembid(0)
  47         , eventprov(this, "event/server")
  48         , sslapi(this)
  49         , DNS(this, "DNS")
  50         , tagevprov(this, "event/messagetag")
  51         , loopCall(false)
  52 {
  53 }
  54
  55 SpanningTreeCommands::SpanningTreeCommands(ModuleSpanningTree* module)
  56         : svsjoin(module), svspart(module), svsnick(module), metadata(module),
  57         uid(module), opertype(module), fjoin(module), ijoin(module), resync(module),
  58         fmode(module), ftopic(module), fhost(module), fident(module), fname(module),
  59         away(module), addline(module), delline(module), encap(module), idle(module),
  60         nick(module), ping(module), pong(module), save(module),
  61         server(module), squit(module), snonotice(module),
  62         endburst(module), sinfo(module), num(module)
  63 {
  64 }
  65
  66 namespace
  67 {
  68         void SetLocalUsersServer(Server* newserver)
  69         {
  70                 // Does not change the server of quitting users because those are not in the list
  71
  72                 ServerInstance->FakeClient->server = newserver;
  73                 const UserManager::LocalList& list = ServerInstance->Users.GetLocalUsers();
  74                 for (UserManager::LocalList::const_iterator i = list.begin(); i != list.end(); ++i)
  75                         (*i)->server = newserver;
  76         }
  77
  78         void ResetMembershipIds()
  79         {
  80                 // Set all membership ids to 0
  81                 const UserManager::LocalList& list = ServerInstance->Users.GetLocalUsers();
  82                 for (UserManager::LocalList::iterator i = list.begin(); i != list.end(); ++i)
  83                 {
  84                         LocalUser* user = *i;
  85                         for (User::ChanList::iterator j = user->chans.begin(); j != user->chans.end(); ++j)
  86                                 (*j)->id = 0;
  87                 }
  88         }
  89 }
  90
  91 void ModuleSpanningTree::init()
  92 {
  93         ServerInstance->SNO->EnableSnomask('l', "LINK");
  94
  95         ResetMembershipIds();
  96
  97         Utils = new SpanningTreeUtilities(this);
  98         Utils->TreeRoot = new TreeServer;
  99
 100         ServerInstance->PI = &protocolinterface;
 101
 102         delete ServerInstance->FakeClient->server;
 103         SetLocalUsersServer(Utils->TreeRoot);
 104 }
 105
 106 void ModuleSpanningTree::ShowLinks(TreeServer* Current, User* user, int hops)
 107 {
 108         std::string Parent = Utils->TreeRoot->GetName();
 109         if (Current->GetParent())
 110         {
 111                 Parent = Current->GetParent()->GetName();
 112         }
 113
 114         const TreeServer::ChildServers& children = Current->GetChildren();
 115         for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
 116         {
 117                 TreeServer* server = *i;
 118                 if ((server->Hidden) || ((Utils->HideULines) && (server->IsULine())))
 119                 {
 120                         if (user->IsOper())
 121                         {
 122                                  ShowLinks(server, user, hops+1);
 123                         }
 124                 }
 125                 else
 126                 {
 127                         ShowLinks(server, user, hops+1);
 128                 }
 129         }
 130         /* Don't display the line if its a uline, hide ulines is on, and the user isnt an oper */
 131         if ((Utils->HideULines) && (Current->IsULine()) && (!user->IsOper()))
 132                 return;
 133         /* Or if the server is hidden and they're not an oper */
 134         else if ((Current->Hidden) && (!user->IsOper()))
 135                 return;
 136
 137         user->WriteNumeric(RPL_LINKS, Current->GetName(),
 138                         (((Utils->FlatLinks) && (!user->IsOper())) ? ServerInstance->Config->ServerName : Parent),
 139                         InspIRCd::Format("%d %s", (((Utils->FlatLinks) && (!user->IsOper())) ? 0 : hops), Current->GetDesc().c_str()));
 140 }
 141
 142 void ModuleSpanningTree::HandleLinks(const CommandBase::Params& parameters, User* user)
 143 {
 144         ShowLinks(Utils->TreeRoot,user,0);
 145         user->WriteNumeric(RPL_ENDOFLINKS, '*', "End of /LINKS list.");
 146 }
 147
 148 std::string ModuleSpanningTree::TimeToStr(time_t secs)
 149 {
 150         time_t mins_up = secs / 60;
 151         time_t hours_up = mins_up / 60;
 152         time_t days_up = hours_up / 24;
 153         secs = secs % 60;
 154         mins_up = mins_up % 60;
 155         hours_up = hours_up % 24;
 156         return ((days_up ? (ConvToStr(days_up) + "d") : "")
 157                         + (hours_up ? (ConvToStr(hours_up) + "h") : "")
 158                         + (mins_up ? (ConvToStr(mins_up) + "m") : "")
 159                         + ConvToStr(secs) + "s");
 160 }
 161
 162 void ModuleSpanningTree::ConnectServer(Autoconnect* a, bool on_timer)
 163 {
 164         if (!a)
 165                 return;
 166         for(unsigned int j=0; j < a->servers.size(); j++)
 167         {
 168                 if (Utils->FindServer(a->servers[j]))
 169                 {
 170                         // found something in this block. Should the server fail,
 171                         // we want to start at the start of the list, not in the
 172                         // middle where we left off
 173                         a->position = -1;
 174                         return;
 175                 }
 176         }
 177         if (on_timer && a->position >= 0)
 178                 return;
 179         if (!on_timer && a->position < 0)
 180                 return;
 181
 182         a->position++;
 183         while (a->position < (int)a->servers.size())
 184         {
 185                 Link* x = Utils->FindLink(a->servers[a->position]);
 186                 if (x)
 187                 {
 188                         ServerInstance->SNO->WriteToSnoMask('l', "AUTOCONNECT: Auto-connecting server \002%s\002", x->Name.c_str());
 189                         ConnectServer(x, a);
 190                         return;
 191                 }
 192                 a->position++;
 193         }
 194         // Autoconnect chain has been fully iterated; start at the beginning on the
 195         // next AutoConnectServers run
 196         a->position = -1;
 197 }
 198
 199 void ModuleSpanningTree::ConnectServer(Link* x, Autoconnect* y)
 200 {
 201         bool ipvalid = true;
 202
 203         if (InspIRCd::Match(ServerInstance->Config->ServerName, x->Name, ascii_case_insensitive_map))
 204         {
 205                 ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Not connecting to myself.");
 206                 return;
 207         }
 208
 209 #ifndef _WIN32
 210         if (x->IPAddr.find('/') != std::string::npos)
 211         {
 212                 struct stat sb;
 213                 if (stat(x->IPAddr.c_str(), &sb) == -1 || !S_ISSOCK(sb.st_mode))
 214                         ipvalid = false;
 215         }
 216 #endif
 217         if (x->IPAddr.find(':') != std::string::npos)
 218         {
 219                 in6_addr n;
 220                 if (inet_pton(AF_INET6, x->IPAddr.c_str(), &n) < 1)
 221                         ipvalid = false;
 222         }
 223         else
 224         {
 225                 in_addr n;
 226                 if (inet_pton(AF_INET, x->IPAddr.c_str(),&n) < 1)
 227                         ipvalid = false;
 228         }
 229
 230         /* Do we already have an IP? If so, no need to resolve it. */
 231         if (ipvalid)
 232         {
 233                 // Create a TreeServer object that will start connecting immediately in the background
 234                 TreeSocket* newsocket = new TreeSocket(x, y, x->IPAddr);
 235                 if (newsocket->GetFd() > -1)
 236                 {
 237                         /* Handled automatically on success */
 238                 }
 239                 else
 240                 {
 241                         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: %s.",
 242                                 x->Name.c_str(), newsocket->getError().c_str());
 243                         ServerInstance->GlobalCulls.AddItem(newsocket);
 244                 }
 245         }
 246         else if (!DNS)
 247         {
 248                 ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: Hostname given and core_dns is not loaded, unable to resolve.", x->Name.c_str());
 249         }
 250         else
 251         {
 252                 // Guess start_type from bindip aftype
 253                 DNS::QueryType start_type = DNS::QUERY_AAAA;
 254                 irc::sockets::sockaddrs bind;
 255                 if ((!x->Bind.empty()) && (irc::sockets::aptosa(x->Bind, 0, bind)))
 256                 {
 257                         if (bind.family() == AF_INET)
 258                                 start_type = DNS::QUERY_A;
 259                 }
 260
 261                 ServernameResolver* snr = new ServernameResolver(*DNS, x->IPAddr, x, start_type, y);
 262                 try
 263                 {
 264                         DNS->Process(snr);
 265                 }
 266                 catch (DNS::Exception& e)
 267                 {
 268                         delete snr;
 269                         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: %s.",x->Name.c_str(), e.GetReason().c_str());
 270                         ConnectServer(y, false);
 271                 }
 272         }
 273 }
 274
 275 void ModuleSpanningTree::AutoConnectServers(time_t curtime)
 276 {
 277         for (std::vector<reference<Autoconnect> >::iterator i = Utils->AutoconnectBlocks.begin(); i < Utils->AutoconnectBlocks.end(); ++i)
 278         {
 279                 Autoconnect* x = *i;
 280                 if (curtime >= x->NextConnectTime)
 281                 {
 282                         x->NextConnectTime = curtime + x->Period;
 283                         ConnectServer(x, true);
 284                 }
 285         }
 286 }
 287
 288 void ModuleSpanningTree::DoConnectTimeout(time_t curtime)
 289 {
 290         SpanningTreeUtilities::TimeoutList::iterator i = Utils->timeoutlist.begin();
 291         while (i != Utils->timeoutlist.end())
 292         {
 293                 TreeSocket* s = i->first;
 294                 std::pair<std::string, unsigned int> p = i->second;
 295                 SpanningTreeUtilities::TimeoutList::iterator me = i;
 296                 i++;
 297                 if (s->GetLinkState() == DYING)
 298                 {
 299                         Utils->timeoutlist.erase(me);
 300                         s->Close();
 301                 }
 302                 else if (curtime > s->age + p.second)
 303                 {
 304                         ServerInstance->SNO->WriteToSnoMask('l',"CONNECT: Error connecting \002%s\002 (timeout of %u seconds)",p.first.c_str(),p.second);
 305                         Utils->timeoutlist.erase(me);
 306                         s->Close();
 307                 }
 308         }
 309 }
 310
 311 ModResult ModuleSpanningTree::HandleVersion(const CommandBase::Params& parameters, User* user)
 312 {
 313         // We've already confirmed that !parameters.empty(), so this is safe
 314         TreeServer* found = Utils->FindServerMask(parameters[0]);
 315         if (found)
 316         {
 317                 if (found == Utils->TreeRoot)
 318                 {
 319                         // Pass to default VERSION handler.
 320                         return MOD_RES_PASSTHRU;
 321                 }
 322
 323                 // If an oper wants to see the version then show the full version string instead of the normal,
 324                 // but only if it is non-empty.
 325                 // If it's empty it might be that the server is still syncing (full version hasn't arrived yet)
 326                 // or the server is a 2.0 server and does not send a full version.
 327                 bool showfull = ((user->IsOper()) && (!found->GetFullVersion().empty()));
 328
 329                 Numeric::Numeric numeric(RPL_VERSION);
 330                 irc::tokenstream tokens(showfull ? found->GetFullVersion() : found->GetVersion());
 331                 for (std::string token; tokens.GetTrailing(token); )
 332                         numeric.push(token);
 333                 user->WriteNumeric(numeric);
 334         }
 335         else
 336         {
 337                 user->WriteNumeric(ERR_NOSUCHSERVER, parameters[0], "No such server");
 338         }
 339         return MOD_RES_DENY;
 340 }
 341
 342 ModResult ModuleSpanningTree::HandleConnect(const CommandBase::Params& parameters, User* user)
 343 {
 344         for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i < Utils->LinkBlocks.end(); i++)
 345         {
 346                 Link* x = *i;
 347                 if (InspIRCd::Match(x->Name, parameters[0], ascii_case_insensitive_map))
 348                 {
 349                         if (InspIRCd::Match(ServerInstance->Config->ServerName, x->Name, ascii_case_insensitive_map))
 350                         {
 351                                 user->WriteRemoteNotice(InspIRCd::Format("*** CONNECT: Server \002%s\002 is ME, not connecting.", x->Name.c_str()));
 352                                 return MOD_RES_DENY;
 353                         }
 354
 355                         TreeServer* CheckDupe = Utils->FindServer(x->Name);
 356                         if (!CheckDupe)
 357                         {
 358                                 user->WriteRemoteNotice(InspIRCd::Format("*** CONNECT: Connecting to server: \002%s\002 (%s:%d)", x->Name.c_str(), (x->HiddenFromStats ? "<hidden>" : x->IPAddr.c_str()), x->Port));
 359                                 ConnectServer(x);
 360                                 return MOD_RES_DENY;
 361                         }
 362                         else
 363                         {
 364                                 user->WriteRemoteNotice(InspIRCd::Format("*** CONNECT: Server \002%s\002 already exists on the network and is connected via \002%s\002", x->Name.c_str(), CheckDupe->GetParent()->GetName().c_str()));
 365                                 return MOD_RES_DENY;
 366                         }
 367                 }
 368         }
 369         user->WriteRemoteNotice(InspIRCd::Format("*** CONNECT: No server matching \002%s\002 could be found in the config file.", parameters[0].c_str()));
 370         return MOD_RES_DENY;
 371 }
 372
 373 void ModuleSpanningTree::OnUserInvite(User* source, User* dest, Channel* channel, time_t expiry, unsigned int notifyrank, CUList& notifyexcepts)
 374 {
 375         if (IS_LOCAL(source))
 376         {
 377                 CmdBuilder params(source, "INVITE");
 378                 params.push_back(dest->uuid);
 379                 params.push_back(channel->name);
 380                 params.push_int(channel->age);
 381                 params.push_back(ConvToStr(expiry));
 382                 params.Broadcast();
 383         }
 384 }
 385
 386 ModResult ModuleSpanningTree::OnPreTopicChange(User* user, Channel* chan, const std::string& topic)
 387 {
 388         // XXX: Deny topic changes if the current topic set time is the current time or is in the future because
 389         // other servers will drop our FTOPIC. This restriction will be removed when the protocol is updated.
 390         if ((chan->topicset >= ServerInstance->Time()) && (Utils->serverlist.size() > 1))
 391         {
 392                 user->WriteNumeric(ERR_CHANOPRIVSNEEDED, chan->name, "Retry topic change later");
 393                 return MOD_RES_DENY;
 394         }
 395         return MOD_RES_PASSTHRU;
 396 }
 397
 398 void ModuleSpanningTree::OnPostTopicChange(User* user, Channel* chan, const std::string &topic)
 399 {
 400         // Drop remote events on the floor.
 401         if (!IS_LOCAL(user))
 402                 return;
 403
 404         CommandFTopic::Builder(user, chan).Broadcast();
 405 }
 406
 407 void ModuleSpanningTree::OnUserPostMessage(User* user, const MessageTarget& target, const MessageDetails& details)
 408 {
 409         if (!IS_LOCAL(user))
 410                 return;
 411
 412         const char* message_type = (details.type == MSG_PRIVMSG ? "PRIVMSG" : "NOTICE");
 413         if (target.type == MessageTarget::TYPE_USER)
 414         {
 415                 User* d = target.Get<User>();
 416                 if (!IS_LOCAL(d))
 417                 {
 418                         CmdBuilder params(user, message_type);
 419                         params.push_tags(details.tags_out);
 420                         params.push_back(d->uuid);
 421                         params.push_last(details.text);
 422                         params.Unicast(d);
 423                 }
 424         }
 425         else if (target.type == MessageTarget::TYPE_CHANNEL)
 426         {
 427                 Utils->SendChannelMessage(user->uuid, target.Get<Channel>(), details.text, target.status, details.tags_out, details.exemptions, message_type);
 428         }
 429         else if (target.type == MessageTarget::TYPE_SERVER)
 430         {
 431                 const std::string* serverglob = target.Get<std::string>();
 432                 CmdBuilder par(user, message_type);
 433                 par.push_tags(details.tags_out);
 434                 par.push_back(*serverglob);
 435                 par.push_last(details.text);
 436                 par.Broadcast();
 437         }
 438 }
 439
 440 void ModuleSpanningTree::OnBackgroundTimer(time_t curtime)
 441 {
 442         AutoConnectServers(curtime);
 443         DoConnectTimeout(curtime);
 444 }
 445
 446 void ModuleSpanningTree::OnUserConnect(LocalUser* user)
 447 {
 448         if (user->quitting)
 449                 return;
 450
 451         // Create the lazy ssl_cert metadata for this user if not already created.
 452         if (sslapi)
 453                 sslapi->GetCertificate(user);
 454
 455         CommandUID::Builder(user).Broadcast();
 456
 457         if (user->IsOper())
 458                 CommandOpertype::Builder(user).Broadcast();
 459
 460         for(Extensible::ExtensibleStore::const_iterator i = user->GetExtList().begin(); i != user->GetExtList().end(); i++)
 461         {
 462                 ExtensionItem* item = i->first;
 463                 std::string value = item->serialize(FORMAT_NETWORK, user, i->second);
 464                 if (!value.empty())
 465                         ServerInstance->PI->SendMetaData(user, item->name, value);
 466         }
 467
 468         Utils->TreeRoot->UserCount++;
 469 }
 470
 471 void ModuleSpanningTree::OnUserJoin(Membership* memb, bool sync, bool created_by_local, CUList& excepts)
 472 {
 473         // Only do this for local users
 474         if (!IS_LOCAL(memb->user))
 475                 return;
 476
 477         // Assign the current membership id to the new Membership and increase it
 478         memb->id = currmembid++;
 479
 480         if (created_by_local)
 481         {
 482                 CommandFJoin::Builder params(memb->chan);
 483                 params.add(memb);
 484                 params.finalize();
 485                 params.Broadcast();
 486         }
 487         else
 488         {
 489                 CmdBuilder params(memb->user, "IJOIN");
 490                 params.push_back(memb->chan->name);
 491                 params.push_int(memb->id);
 492                 if (!memb->modes.empty())
 493                 {
 494                         params.push_back(ConvToStr(memb->chan->age));
 495                         params.push_back(memb->modes);
 496                 }
 497                 params.Broadcast();
 498         }
 499 }
 500
 501 void ModuleSpanningTree::OnChangeHost(User* user, const std::string &newhost)
 502 {
 503         if (user->registered != REG_ALL || !IS_LOCAL(user))
 504                 return;
 505
 506         CmdBuilder(user, "FHOST").push(newhost).Broadcast();
 507 }
 508
 509 void ModuleSpanningTree::OnChangeRealName(User* user, const std::string& real)
 510 {
 511         if (user->registered != REG_ALL || !IS_LOCAL(user))
 512                 return;
 513
 514         CmdBuilder(user, "FNAME").push_last(real).Broadcast();
 515 }
 516
 517 void ModuleSpanningTree::OnChangeIdent(User* user, const std::string &ident)
 518 {
 519         if ((user->registered != REG_ALL) || (!IS_LOCAL(user)))
 520                 return;
 521
 522         CmdBuilder(user, "FIDENT").push(ident).Broadcast();
 523 }
 524
 525 void ModuleSpanningTree::OnUserPart(Membership* memb, std::string &partmessage, CUList& excepts)
 526 {
 527         if (IS_LOCAL(memb->user))
 528         {
 529                 CmdBuilder params(memb->user, "PART");
 530                 params.push_back(memb->chan->name);
 531                 if (!partmessage.empty())
 532                         params.push_last(partmessage);
 533                 params.Broadcast();
 534         }
 535 }
 536
 537 void ModuleSpanningTree::OnUserQuit(User* user, const std::string &reason, const std::string &oper_message)
 538 {
 539         if (IS_LOCAL(user))
 540         {
 541                 if (oper_message != reason)
 542                         ServerInstance->PI->SendMetaData(user, "operquit", oper_message);
 543
 544                 CmdBuilder(user, "QUIT").push_last(reason).Broadcast();
 545         }
 546         else
 547         {
 548                 // Hide the message if one of the following is true:
 549                 // - User is being quit due to a netsplit and quietbursts is on
 550                 // - Server is a silent uline
 551                 TreeServer* server = TreeServer::Get(user);
 552                 bool hide = (((server->IsDead()) && (Utils->quiet_bursts)) || (server->IsSilentULine()));
 553                 if (!hide)
 554                 {
 555                         ServerInstance->SNO->WriteToSnoMask('Q', "Client exiting on server %s: %s (%s) [%s]",
 556                                 user->server->GetName().c_str(), user->GetFullRealHost().c_str(), user->GetIPString().c_str(), oper_message.c_str());
 557                 }
 558         }
 559
 560         // Regardless, update the UserCount
 561         TreeServer::Get(user)->UserCount--;
 562 }
 563
 564 void ModuleSpanningTree::OnUserPostNick(User* user, const std::string &oldnick)
 565 {
 566         if (IS_LOCAL(user))
 567         {
 568                 // The nick TS is updated by the core, we don't do it
 569                 CmdBuilder params(user, "NICK");
 570                 params.push_back(user->nick);
 571                 params.push_back(ConvToStr(user->age));
 572                 params.Broadcast();
 573         }
 574         else if (!loopCall)
 575         {
 576                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "WARNING: Changed nick of remote user %s from %s to %s TS %lu by ourselves!", user->uuid.c_str(), oldnick.c_str(), user->nick.c_str(), (unsigned long) user->age);
 577         }
 578 }
 579
 580 void ModuleSpanningTree::OnUserKick(User* source, Membership* memb, const std::string &reason, CUList& excepts)
 581 {
 582         if ((!IS_LOCAL(source)) && (source != ServerInstance->FakeClient))
 583                 return;
 584
 585         CmdBuilder params(source, "KICK");
 586         params.push_back(memb->chan->name);
 587         params.push_back(memb->user->uuid);
 588         // If a remote user is being kicked by us then send the membership id in the kick too
 589         if (!IS_LOCAL(memb->user))
 590                 params.push_int(memb->id);
 591         params.push_last(reason);
 592         params.Broadcast();
 593 }
 594
 595 void ModuleSpanningTree::OnPreRehash(User* user, const std::string &parameter)
 596 {
 597         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "OnPreRehash called with param %s", parameter.c_str());
 598
 599         // Send out to other servers
 600         if (!parameter.empty() && parameter[0] != '-')
 601         {
 602                 CmdBuilder params((user ? user->uuid : ServerInstance->Config->GetSID()), "REHASH");
 603                 params.push_back(parameter);
 604                 params.Forward(user ? TreeServer::Get(user)->GetRoute() : NULL);
 605         }
 606 }
 607
 608 void ModuleSpanningTree::ReadConfig(ConfigStatus& status)
 609 {
 610         // Did this rehash change the description of this server?
 611         const std::string& newdesc = ServerInstance->Config->ServerDesc;
 612         if (newdesc != Utils->TreeRoot->GetDesc())
 613         {
 614                 // Broadcast a SINFO desc message to let the network know about the new description. This is the description
 615                 // string that is sent in the SERVER message initially and shown for example in WHOIS.
 616                 // We don't need to update the field itself in the Server object - the core does that.
 617                 CommandSInfo::Builder(Utils->TreeRoot, "desc", newdesc).Broadcast();
 618         }
 619
 620         // Re-read config stuff
 621         try
 622         {
 623                 Utils->ReadConfiguration();
 624         }
 625         catch (ModuleException& e)
 626         {
 627                 // Refresh the IP cache anyway, so servers read before the error will be allowed to connect
 628                 Utils->RefreshIPCache();
 629                 // Always warn local opers with snomask +l, also warn globally (snomask +L) if the rehash was issued by a remote user
 630                 std::string msg = "Error in configuration: ";
 631                 msg.append(e.GetReason());
 632                 ServerInstance->SNO->WriteToSnoMask('l', msg);
 633                 if (status.srcuser && !IS_LOCAL(status.srcuser))
 634                         ServerInstance->PI->SendSNONotice('L', msg);
 635         }
 636 }
 637
 638 void ModuleSpanningTree::OnLoadModule(Module* mod)
 639 {
 640         std::string data;
 641         data.push_back('+');
 642         data.append(mod->ModuleSourceFile);
 643         Version v = mod->GetVersion();
 644         if (!v.link_data.empty())
 645         {
 646                 data.push_back('=');
 647                 data.append(v.link_data);
 648         }
 649         ServerInstance->PI->SendMetaData("modules", data);
 650 }
 651
 652 void ModuleSpanningTree::OnUnloadModule(Module* mod)
 653 {
 654         if (!Utils)
 655                 return;
 656         ServerInstance->PI->SendMetaData("modules", "-" + mod->ModuleSourceFile);
 657
 658         if (mod == this)
 659         {
 660                 // We are being unloaded, inform modules about all servers splitting which cannot be done later when the servers are actually disconnected
 661                 const server_hash& servers = Utils->serverlist;
 662                 for (server_hash::const_iterator i = servers.begin(); i != servers.end(); ++i)
 663                 {
 664                         TreeServer* server = i->second;
 665                         if (!server->IsRoot())
 666                                 FOREACH_MOD_CUSTOM(GetEventProvider(), ServerEventListener, OnServerSplit, (server));
 667                 }
 668                 return;
 669         }
 670
 671         // Some other module is being unloaded. If it provides an IOHook we use, we must close that server connection now.
 672
 673 restart:
 674         // Close all connections which use an IO hook provided by this module
 675         const TreeServer::ChildServers& list = Utils->TreeRoot->GetChildren();
 676         for (TreeServer::ChildServers::const_iterator i = list.begin(); i != list.end(); ++i)
 677         {
 678                 TreeSocket* sock = (*i)->GetSocket();
 679                 if (sock->GetModHook(mod))
 680                 {
 681                         sock->SendError("SSL module unloaded");
 682                         sock->Close();
 683                         // XXX: The list we're iterating is modified by TreeServer::SQuit() which is called by Close()
 684                         goto restart;
 685                 }
 686         }
 687
 688         for (SpanningTreeUtilities::TimeoutList::const_iterator i = Utils->timeoutlist.begin(); i != Utils->timeoutlist.end(); ++i)
 689         {
 690                 TreeSocket* sock = i->first;
 691                 if (sock->GetModHook(mod))
 692                         sock->Close();
 693         }
 694 }
 695
 696 void ModuleSpanningTree::OnOper(User* user, const std::string &opertype)
 697 {
 698         if (user->registered != REG_ALL || !IS_LOCAL(user))
 699                 return;
 700
 701         // Note: The protocol does not allow direct umode +o;
 702         // sending OPERTYPE infers +o modechange locally.
 703         CommandOpertype::Builder(user).Broadcast();
 704 }
 705
 706 void ModuleSpanningTree::OnAddLine(User* user, XLine *x)
 707 {
 708         if (!x->IsBurstable() || loopCall || (user && !IS_LOCAL(user)))
 709                 return;
 710
 711         if (!user)
 712                 user = ServerInstance->FakeClient;
 713
 714         CommandAddLine::Builder(x, user).Broadcast();
 715 }
 716
 717 void ModuleSpanningTree::OnDelLine(User* user, XLine *x)
 718 {
 719         if (!x->IsBurstable() || loopCall || (user && !IS_LOCAL(user)))
 720                 return;
 721
 722         if (!user)
 723                 user = ServerInstance->FakeClient;
 724
 725         CmdBuilder params(user, "DELLINE");
 726         params.push_back(x->type);
 727         params.push_back(x->Displayable());
 728         params.Broadcast();
 729 }
 730
 731 void ModuleSpanningTree::OnUserAway(User* user)
 732 {
 733         if (IS_LOCAL(user))
 734                 CommandAway::Builder(user).Broadcast();
 735 }
 736
 737 void ModuleSpanningTree::OnUserBack(User* user)
 738 {
 739         if (IS_LOCAL(user))
 740                 CommandAway::Builder(user).Broadcast();
 741 }
 742
 743 void ModuleSpanningTree::OnMode(User* source, User* u, Channel* c, const Modes::ChangeList& modes, ModeParser::ModeProcessFlag processflags)
 744 {
 745         if (processflags & ModeParser::MODE_LOCALONLY)
 746                 return;
 747
 748         if (u)
 749         {
 750                 if (u->registered != REG_ALL)
 751                         return;
 752
 753                 CmdBuilder params(source, "MODE");
 754                 params.push(u->uuid);
 755                 params.push(ClientProtocol::Messages::Mode::ToModeLetters(modes));
 756                 params.push_raw(Translate::ModeChangeListToParams(modes.getlist()));
 757                 params.Broadcast();
 758         }
 759         else
 760         {
 761                 CmdBuilder params(source, "FMODE");
 762                 params.push(c->name);
 763                 params.push_int(c->age);
 764                 params.push(ClientProtocol::Messages::Mode::ToModeLetters(modes));
 765                 params.push_raw(Translate::ModeChangeListToParams(modes.getlist()));
 766                 params.Broadcast();
 767         }
 768 }
 769
 770 CullResult ModuleSpanningTree::cull()
 771 {
 772         if (Utils)
 773                 Utils->cull();
 774         return this->Module::cull();
 775 }
 776
 777 ModuleSpanningTree::~ModuleSpanningTree()
 778 {
 779         ServerInstance->PI = &ServerInstance->DefaultProtocolInterface;
 780
 781         Server* newsrv = new Server(ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc);
 782         SetLocalUsersServer(newsrv);
 783
 784         delete Utils;
 785 }
 786
 787 Version ModuleSpanningTree::GetVersion()
 788 {
 789         return Version("Allows servers to be linked", VF_VENDOR);
 790 }
 791
 792 /* It is IMPORTANT that m_spanningtree is the last module in the chain
 793  * so that any activity it sees is FINAL, e.g. we arent going to send out
 794  * a NICK message before m_cloaking has finished putting the +x on the user,
 795  * etc etc.
 796  * Therefore, we set our priority to PRIORITY_LAST to make sure we end up at the END of
 797  * the module call queue.
 798  */
 799 void ModuleSpanningTree::Prioritize()
 800 {
 801         ServerInstance->Modules->SetPriority(this, PRIORITY_LAST);
 802         ServerInstance->Modules.SetPriority(this, I_OnPreTopicChange, PRIORITY_FIRST);
 803 }
 804
 805 MODULE_INIT(ModuleSpanningTree)