src/modules/m_spanningtree/treesocket2.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "commands/cmd_whois.h"
  16 #include "commands/cmd_stats.h"
  17 #include "socket.h"
  18 #include "wildcard.h"
  19 #include "xline.h"
  20 #include "transport.h"
  21 #include "socketengine.h"
  22
  23 #include "m_spanningtree/main.h"
  24 #include "m_spanningtree/utils.h"
  25 #include "m_spanningtree/treeserver.h"
  26 #include "m_spanningtree/link.h"
  27 #include "m_spanningtree/treesocket.h"
  28 #include "m_spanningtree/resolvers.h"
  29 #include "m_spanningtree/handshaketimer.h"
  30
  31 /* $ModDep: m_spanningtree/timesynctimer.h m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h */
  32
  33 static std::map<std::string, std::string> warned;       /* Server names that have had protocol violation warnings displayed for them */
  34
  35 void TreeSocket::WriteLine(std::string line)
  36 {
  37         Instance->Logs->Log("m_spanningtree",DEBUG, "S[%d] O %s", this->GetFd(), line.c_str());
  38         line.append("\r\n");
  39         this->Write(line);
  40 }
  41
  42
  43 /* Handle ERROR command */
  44 bool TreeSocket::Error(std::deque<std::string> &params)
  45 {
  46         if (params.size() < 1)
  47                 return false;
  48         this->Instance->SNO->WriteToSnoMask('l',"ERROR from %s: %s",(!InboundServerName.empty() ? InboundServerName.c_str() : myhost.c_str()),params[0].c_str());
  49         /* we will return false to cause the socket to close. */
  50         return false;
  51 }
  52
  53 void TreeSocket::Split(const std::string &line, std::deque<std::string> &n)
  54 {
  55         n.clear();
  56         irc::tokenstream tokens(line);
  57         std::string param;
  58         while (tokens.GetToken(param))
  59         {
  60                 n.push_back(param);
  61         }
  62         return;
  63 }
  64
  65 bool TreeSocket::ProcessLine(std::string &line)
  66 {
  67         std::deque<std::string> params;
  68         irc::string command;
  69         std::string prefix;
  70
  71         line = line.substr(0, line.find_first_of("\r\n"));
  72
  73         if (line.empty())
  74                 return true;
  75
  76         Instance->Logs->Log("m_spanningtree",DEBUG, "S[%d] I %s", this->GetFd(), line.c_str());
  77
  78         this->Split(line.c_str(),params);
  79
  80         if (params.empty())
  81                 return true;
  82
  83         if ((params[0][0] == ':') && (params.size() > 1))
  84         {
  85                 prefix = params[0].substr(1);
  86                 params.pop_front();
  87
  88                 if (prefix.empty())
  89                 {
  90                         this->SendError("BUG (?) Empty prefix recieved.");
  91                         return false;
  92                 }
  93         }
  94
  95         command = params[0].c_str();
  96         params.pop_front();
  97
  98         switch (this->LinkState)
  99         {
 100                 TreeServer* Node;
 101
 102                 case WAIT_AUTH_1:
 103                         /*
 104                          * State WAIT_AUTH_1:
 105                          *  Waiting for SERVER command from remote server. Server initiating
 106                          *  the connection sends the first SERVER command, listening server
 107                          *  replies with theirs if its happy, then if the initiator is happy,
 108                          *  it starts to send its net sync, which starts the merge, otherwise
 109                          *  it sends an ERROR.
 110                          */
 111                         if (command == "PASS")
 112                         {
 113                                 /*
 114                                  * Ignore this silently. Some services packages insist on sending PASS, even
 115                                  * when it is not required (i.e. by us). We have to ignore this here, otherwise
 116                                  * as it's an unknown command (effectively), it will cause the connection to be
 117                                  * closed, which probably isn't what people want. -- w00t
 118                                  */
 119                         }
 120                         else if (command == "SERVER")
 121                         {
 122                                 return this->Inbound_Server(params);
 123                         }
 124                         else if (command == "ERROR")
 125                         {
 126                                 return this->Error(params);
 127                         }
 128                         else if (command == "USER")
 129                         {
 130                                 this->SendError("Client connections to this port are prohibited.");
 131                                 return false;
 132                         }
 133                         else if (command == "CAPAB")
 134                         {
 135                                 return this->Capab(params);
 136                         }
 137                         else
 138                         {
 139                                 // XXX ...wtf.
 140                                 irc::string error = "Invalid command in negotiation phase: " + command;
 141                                 this->SendError(assign(error));
 142                                 return false;
 143                         }
 144                 break;
 145                 case WAIT_AUTH_2:
 146                         /*
 147                          * State WAIT_AUTH_2:
 148                          *  We have sent SERVER to the other side of the connection. Now we're waiting for them to start BURST.
 149                          *  The other option at this stage of things, of course, is for them to close our connection thanks
 150                          *  to invalid credentials.. -- w
 151                          */
 152                         if (command == "SERVER")
 153                         {
 154                                 /*
 155                                  * Connection is either attempting to re-auth itself (stupid) or sending netburst without sending BURST.
 156                                  * Both of these aren't allowable, so block them here. -- w
 157                                  */
 158                                 this->SendError("You may not re-authenticate or commence netburst without sending BURST.");
 159                                 return true;
 160                         }
 161                         else if (command == "BURST")
 162                         {
 163                                 if (params.size())
 164                                 {
 165                                         time_t them = atoi(params[0].c_str());
 166                                         time_t delta = them - Instance->Time();
 167                                         if ((delta < -600) || (delta > 600))
 168                                         {
 169                                                 Instance->SNO->WriteToSnoMask('l',"\2ERROR\2: Your clocks are out by %d seconds (this is more than five minutes). Link aborted, \2PLEASE SYNC YOUR CLOCKS!\2",abs(delta));
 170                                                 SendError("Your clocks are out by "+ConvToStr(abs(delta))+" seconds (this is more than five minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
 171                                                 return false;
 172                                         }
 173                                         else if ((delta < -30) || (delta > 30))
 174                                         {
 175                                                 Instance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your clocks are out by %d seconds. Please consider synching your clocks.", abs(delta));
 176                                         }
 177                                 }
 178                                 this->LinkState = CONNECTED;
 179                                 Link* lnk = Utils->FindLink(InboundServerName);
 180
 181                                 Node = new TreeServer(this->Utils, this->Instance, InboundServerName, InboundDescription, InboundSID, Utils->TreeRoot, this, lnk ? lnk->Hidden : false);
 182
 183                                 if (Node->DuplicateID())
 184                                 {
 185                                         this->SendError("Server ID "+InboundSID+" already exists on the network!");
 186                                         this->Instance->SNO->WriteToSnoMask('l',"Server \2"+InboundServerName+"\2 being introduced from \2" + prefix + "\2 denied, server ID already exists on the network. Closing link.");
 187                                         return false;
 188                                 }
 189
 190                                 Utils->TreeRoot->AddChild(Node);
 191                                 params.clear();
 192                                 params.push_back(InboundServerName);
 193                                 params.push_back("*");
 194                                 params.push_back("1");
 195                                 params.push_back(InboundSID);
 196                                 params.push_back(":"+InboundDescription);
 197                                 Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,InboundServerName);
 198                                 Node->bursting = true;
 199                                 this->DoBurst(Node);
 200                         }
 201                         else if (command == "ERROR")
 202                         {
 203                                 return this->Error(params);
 204                         }
 205                         else if (command == "CAPAB")
 206                         {
 207                                 return this->Capab(params);
 208                         }
 209
 210                 break;
 211                 case LISTENER:
 212                         /*
 213                          * This really shouldn't happen.
 214                          */
 215                         this->SendError("Internal error -- listening socket accepted its own descriptor!!!");
 216                         return false;
 217                 break;
 218                 case CONNECTING:
 219                         /*
 220                          * State CONNECTING:
 221                          *  We're connecting (OUTGOING) to another server. They are in state WAIT_AUTH_1 until they verify
 222                          *  our credentials, when they proceed into WAIT_AUTH_2 and send SERVER to us. We then send BURST
 223                          *  + our netburst, which will put them into CONNECTED state. -- w
 224                          */
 225                         if (command == "SERVER")
 226                         {
 227                                 // Our credentials have been accepted, send netburst. (this puts US into the CONNECTED state)
 228                                 return this->Outbound_Reply_Server(params);
 229                         }
 230                         else if (command == "ERROR")
 231                         {
 232                                 return this->Error(params);
 233                         }
 234                         else if (command == "CAPAB")
 235                         {
 236                                 return this->Capab(params);
 237                         }
 238                 break;
 239                 case CONNECTED:
 240                         /*
 241                         * State CONNECTED:
 242                          *  Credentials have been exchanged, we've gotten their 'BURST' (or sent ours).
 243                          *  Anything from here on should be accepted a little more reasonably.
 244                          */
 245                         if (!prefix.empty())
 246                         {
 247                                 /*
 248                                  * Check for fake direction here, and drop any instances that are found.
 249                                  * What is fake direction? Imagine the following server setup:
 250                                  *    0AA <-> 0AB <-> 0AC
 251                                  * Fake direction would be 0AC sending a message to 0AB claiming to be from
 252                                  * 0AA, or something similar. Basically, a message taking a path that *cannot*
 253                                  * be correct.
 254                                  *
 255                                  * When would this be seen?
 256                                  * Well, hopefully never. It could be caused by race conditions, bugs, or
 257                                  * "miscreant" servers, though, so let's check anyway. -- w
 258                                  */
 259                                 std::string direction = prefix;
 260
 261                                 User *t = this->Instance->FindUUID(prefix);
 262                                 if (t)
 263                                 {
 264                                         direction = t->server;
 265                                 }
 266
 267                                 TreeServer* route_back_again = Utils->BestRouteTo(direction);
 268                                 if ((!route_back_again) || (route_back_again->GetSocket() != this))
 269                                 {
 270                                         if (route_back_again)
 271                                                 Instance->Logs->Log("m_spanningtree",DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
 272                                         return true;
 273                                 }
 274                                 /* Fix by brain:
 275                                  * When there is activity on the socket, reset the ping counter so
 276                                  * that we're not wasting bandwidth pinging an active server.
 277                                  */
 278                                 route_back_again->SetNextPingTime(Instance->Time() + Utils->PingFreq);
 279                                 route_back_again->SetPingFlag();
 280                         }
 281                         else
 282                         {
 283                                 /*
 284                                  * Empty prefix from a server to server link:
 285                                  *  This is somewhat bad/naughty, so let's set the prefix
 286                                  *  to be the link that we got it from, so we don't break anything. -- w
 287                                  */
 288                                 TreeServer* n = Utils->FindServer(GetName());
 289                                 if (n)
 290                                         prefix = n->GetID();
 291                                 else
 292                                         prefix = GetName();
 293                         }
 294
 295                         /*
 296                          * First up, check for any malformed commands (e.g. MODE without a timestamp)
 297                          * and rewrite commands where necessary (SVSMODE -> MODE for services). -- w
 298                          */
 299                         if (command == "MODE")
 300                         {
 301                                 if (params.size() >= 2)
 302                                 {
 303                                         Channel* channel = Instance->FindChan(params[0]);
 304                                         if (channel)
 305                                         {
 306                                                 User* x = Instance->FindNick(prefix);
 307                                                 if (x)
 308                                                 {
 309                                                         if (warned.find(x->server) == warned.end())
 310                                                         {
 311                                                                 Instance->Logs->Log("m_spanningtree",DEFAULT,"WARNING: I revceived modes '%s' from another server '%s'. This is not compliant with InspIRCd. Please check that server for bugs.", params[1].c_str(), x->server);
 312                                                                 Instance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending nonstandard modes: '%s MODE %s' where FMODE should be used, and may cause desyncs.", x->server, x->nick, params[1].c_str());
 313                                                                 warned[x->server] = x->nick;
 314                                                         }
 315                                                 }
 316                                         }
 317                                 }
 318                         }
 319                         else if (command == "SVSMODE")
 320                         {
 321                                 command = "MODE";
 322                         }
 323
 324
 325                         /*
 326                          * Now, check for (and parse) commands as appropriate. -- w
 327                          */
 328
 329                         /* Find the server that this command originated from, used in the handlers below */
 330                         TreeServer *ServerSource = Utils->FindServer(prefix);
 331
 332                         /* Find the link we just got this from so we don't bounce it back incorrectly */
 333                         std::string sourceserv = this->myhost;
 334                         if (!this->InboundServerName.empty())
 335                         {
 336                                 sourceserv = this->InboundServerName;
 337                         }
 338
 339                         /*
 340                          * XXX one of these days, this needs to be moved into class Commands.
 341                          */
 342                         if (command == "UID")
 343                         {
 344                                 return this->ParseUID(prefix, params);
 345                         }
 346                         else if (command == "FJOIN")
 347                         {
 348                                 return this->ForceJoin(prefix,params);
 349                         }
 350                         else if ((command == "NOTICE" || command == "PRIVMSG") && (Utils->IsServer(prefix)))
 351                         {
 352                                 return this->ServerMessage(assign(command), prefix, params, sourceserv);
 353                         }
 354                         else if (command == "STATS")
 355                         {
 356                                 return this->Stats(prefix, params);
 357                         }
 358                         else if (command == "MOTD")
 359                         {
 360                                 return this->Motd(prefix, params);
 361                         }
 362                         else if (command == "KILL" && ServerSource)
 363                         {
 364                                 // Kill from a server
 365                                 return this->RemoteKill(prefix,params);
 366                         }
 367                         else if (command == "MODULES")
 368                         {
 369                                 return this->Modules(prefix, params);
 370                         }
 371                         else if (command == "ADMIN")
 372                         {
 373                                 return this->Admin(prefix, params);
 374                         }
 375                         else if (command == "SERVER")
 376                         {
 377                                 return this->RemoteServer(prefix,params);
 378                         }
 379                         else if (command == "ERROR")
 380                         {
 381                                 return this->Error(params);
 382                         }
 383                         else if (command == "OPERTYPE")
 384                         {
 385                                 return this->OperType(prefix,params);
 386                         }
 387                         else if (command == "FMODE")
 388                         {
 389                                 return this->ForceMode(prefix,params);
 390                         }
 391                         else if (command == "FTOPIC")
 392                         {
 393                                 return this->ForceTopic(prefix,params);
 394                         }
 395                         else if (command == "REHASH")
 396                         {
 397                                 return this->RemoteRehash(prefix,params);
 398                         }
 399                         else if (command == "METADATA")
 400                         {
 401                                 return this->MetaData(prefix,params);
 402                         }
 403                         else if (command == "PING")
 404                         {
 405                                 return this->LocalPing(prefix,params);
 406                         }
 407                         else if (command == "PONG")
 408                         {
 409                                 return this->LocalPong(prefix,params);
 410                         }
 411                         else if (command == "VERSION")
 412                         {
 413                                 return this->ServerVersion(prefix,params);
 414                         }
 415                         else if (command == "FHOST")
 416                         {
 417                                 return this->ChangeHost(prefix,params);
 418                         }
 419                         else if (command == "FNAME")
 420                         {
 421                                 return this->ChangeName(prefix,params);
 422                         }
 423                         else if (command == "ADDLINE")
 424                         {
 425                                 return this->AddLine(prefix,params);
 426                         }
 427                         else if (command == "DELLINE")
 428                         {
 429                                 return this->DelLine(prefix,params);
 430                         }
 431                         else if (command == "SVSNICK")
 432                         {
 433                                 return this->ForceNick(prefix,params);
 434                         }
 435                         else if (command == "OPERQUIT")
 436                         {
 437                                 return this->OperQuit(prefix,params);
 438                         }
 439                         else if (command == "IDLE")
 440                         {
 441                                 return this->Whois(prefix,params);
 442                         }
 443                         else if (command == "PUSH")
 444                         {
 445                                 return this->Push(prefix,params);
 446                         }
 447                         else if (command == "TIME")
 448                         {
 449                                 return this->Time(prefix,params);
 450                         }
 451                         else if ((command == "KICK") && (Utils->IsServer(prefix)))
 452                         {
 453                                 if (params.size() == 3)
 454                                 {
 455                                         User* user = this->Instance->FindNick(params[1]);
 456                                         Channel* chan = this->Instance->FindChan(params[0]);
 457                                         if (user && chan)
 458                                         {
 459                                                 if (!chan->ServerKickUser(user, params[2].c_str(), false))
 460                                                         /* Yikes, the channels gone! */
 461                                                         delete chan;
 462                                         }
 463                                 }
 464
 465                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
 466                         }
 467                         else if (command == "SVSJOIN")
 468                         {
 469                                 return this->ServiceJoin(prefix,params);
 470                         }
 471                         else if (command == "SVSPART")
 472                         {
 473                                 return this->ServicePart(prefix,params);
 474                         }
 475                         else if (command == "SQUIT")
 476                         {
 477                                 if (params.size() == 2)
 478                                 {
 479                                         this->Squit(Utils->FindServer(params[0]),params[1]);
 480                                 }
 481                                 return true;
 482                         }
 483                         else if (command == "OPERNOTICE")
 484                         {
 485                                 if (params.size() >= 1)
 486                                         Instance->SNO->WriteToSnoMask('A', "From " + prefix + ": " + params[0]);
 487                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 488                         }
 489                         else if (command == "MODENOTICE")
 490                         {
 491                                 if (params.size() >= 2)
 492                                 {
 493                                         Instance->Users->WriteMode(params[0].c_str(), WM_AND, "*** From %s: %s", prefix.c_str(), params[1].c_str());
 494                                 }
 495                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 496                         }
 497                         else if (command == "SNONOTICE")
 498                         {
 499                                 if (params.size() >= 2)
 500                                 {
 501                                         Instance->SNO->WriteToSnoMask(*(params[0].c_str()), "From " + prefix + ": "+ params[1]);
 502                                 }
 503                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 504                         }
 505                         else if (command == "BURST")
 506                         {
 507                                 // Set prefix server as bursting
 508                                 if (!ServerSource)
 509                                 {
 510                                         this->Instance->SNO->WriteToSnoMask('l', "WTF: Got BURST from a nonexistant server(?): %s", prefix.c_str());
 511                                         return false;
 512                                 }
 513
 514                                 ServerSource->bursting = true;
 515                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 516                         }
 517                         else if (command == "ENDBURST")
 518                         {
 519                                 if (!ServerSource)
 520                                 {
 521                                         this->Instance->SNO->WriteToSnoMask('l', "WTF: Got ENDBURST from a nonexistant server(?): %s", prefix.c_str());
 522                                         return false;
 523                                 }
 524
 525                                 ServerSource->FinishBurst();
 526                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 527                         }
 528                         else if (command == "ENCAP")
 529                         {
 530                                 ServerSource->FinishBurst();
 531                                 return this->Encap(prefix, params);
 532                         }
 533                         else if (command == "MODE")
 534                         {
 535                                 // Server-prefix MODE.
 536                                 const char* modelist[MAXPARAMETERS];
 537                                 for (size_t i = 0; i < params.size(); i++)
 538                                         modelist[i] = params[i].c_str();
 539
 540                                 /* We don't support this for channel mode changes any more! */
 541                                 if (params.size() >= 1)
 542                                 {
 543                                         if (Instance->FindChan(params[0]))
 544                                         {
 545                                                 this->SendError("Protocol violation by '"+prefix+"'! MODE for channel mode changes is not supported by the InspIRCd 1.2 protocol. You must use FMODE to preserve channel timestamps.");
 546                                                 return false;
 547                                         }
 548                                 }
 549
 550                                 // Insert into the parser
 551                                 this->Instance->SendMode(modelist, params.size(), this->Instance->FakeClient);
 552
 553                                 // Pass out to the network
 554                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
 555                         }
 556                         else
 557                         {
 558                                 /*
 559                                  * Not a special s2s command. Emulate the user doing it.
 560                                  * This saves us having a huge ugly command parser again.
 561                                  */
 562                                 User *who = this->Instance->FindUUID(prefix);
 563
 564                                 if (!who)
 565                                 {
 566                                         // this looks ugly because command is an irc::string
 567                                         this->SendError("Command (" + std::string(command.c_str()) + ") from unknown prefix (" + prefix + ")! Dropping link.");
 568                                         return false;
 569                                 }
 570
 571                                 if (command == "NICK")
 572                                 {
 573                                         if (params.size() != 2)
 574                                         {
 575                                                 SendError("Protocol violation: NICK message without TS - :"+std::string(who->uuid)+" NICK "+params[0]);
 576                                                 return false;
 577                                         }
 578                                         /* Update timestamp on user when they change nicks */
 579                                         who->age = atoi(params[1].c_str());
 580
 581                                         /*
 582                                          * On nick messages, check that the nick doesnt already exist here.
 583                                          * If it does, perform collision logic.
 584                                          */
 585                                         User* x = this->Instance->FindNickOnly(params[0]);
 586                                         if ((x) && (x != who))
 587                                         {
 588                                                 int collideret = 0;
 589                                                 /* x is local, who is remote */
 590                                                 collideret = this->DoCollision(x, who->age, who->ident, who->GetIPString(), who->uuid);
 591                                                 if (collideret != 1)
 592                                                 {
 593                                                         /*
 594                                                          * Remote client lost, or both lost, parsing this nickchange would be
 595                                                          * pointless, as the incoming client's server will soon recieve SVSNICK to
 596                                                          * change its nick to its UID. :) -- w00t
 597                                                          */
 598                                                         return true;
 599                                                 }
 600                                         }
 601                                 }
 602
 603                                 // its a user
 604                                 const char* strparams[127];
 605                                 for (unsigned int q = 0; q < params.size(); q++)
 606                                 {
 607                                         strparams[q] = params[q].c_str();
 608                                 }
 609
 610                                 switch (this->Instance->CallCommandHandler(command.c_str(), strparams, params.size(), who))
 611                                 {
 612                                         case CMD_INVALID:
 613                                                 // command is irc::string, hence ugliness
 614                                                 this->SendError("Unrecognised or malformed command '" + std::string(command.c_str()) + "' -- possibly loaded mismatched modules");
 615                                                 return false;
 616                                                 break;
 617                                         /*
 618                                          * CMD_LOCALONLY is aliased to CMD_FAILURE, so this won't go out onto the network.
 619                                          */
 620                                         case CMD_FAILURE:
 621                                                 return true;
 622                                                 break;
 623                                         default:
 624                                                 /* CMD_SUCCESS and CMD_USER_DELETED fall through here */
 625                                                 break;
 626                                 }
 627
 628                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
 629
 630                         }
 631                         return true;
 632                         break; // end of state CONNECTED (phew).
 633         }
 634         return true;
 635 }
 636
 637 std::string TreeSocket::GetName()
 638 {
 639         std::string sourceserv = this->myhost;
 640         if (!this->InboundServerName.empty())
 641         {
 642                 sourceserv = this->InboundServerName;
 643         }
 644         return sourceserv;
 645 }
 646
 647 void TreeSocket::OnTimeout()
 648 {
 649         if (this->LinkState == CONNECTING)
 650         {
 651                 Utils->Creator->RemoteMessage(NULL, "CONNECT: Connection to \002%s\002 timed out.", myhost.c_str());
 652                 Link* MyLink = Utils->FindLink(myhost);
 653                 if (MyLink)
 654                         Utils->DoFailOver(MyLink);
 655         }
 656 }
 657
 658 void TreeSocket::OnClose()
 659 {
 660         // Test fix for big fuckup
 661         if (this->LinkState != CONNECTED)
 662                 return;
 663
 664         // Connection closed.
 665         // If the connection is fully up (state CONNECTED)
 666         // then propogate a netsplit to all peers.
 667         std::string quitserver = this->myhost;
 668         if (!this->InboundServerName.empty())
 669         {
 670                 quitserver = this->InboundServerName;
 671         }
 672         TreeServer* s = Utils->FindServer(quitserver);
 673         if (s)
 674         {
 675                 Squit(s,"Remote host closed the connection");
 676         }
 677
 678         if (!quitserver.empty())
 679         {
 680                 Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' failed.",quitserver.c_str());
 681                 time_t server_uptime = Instance->Time() - this->age;
 682                 if (server_uptime)
 683                         Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' was established for %s", quitserver.c_str(), Utils->Creator->TimeToStr(server_uptime).c_str());
 684         }
 685 }
 686
 687 int TreeSocket::OnIncomingConnection(int newsock, char* ip)
 688 {
 689         /* To prevent anyone from attempting to flood opers/DDoS by connecting to the server port,
 690          * or discovering if this port is the server port, we don't allow connections from any
 691          * IPs for which we don't have a link block.
 692          */
 693         bool found = false;
 694
 695         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
 696         if (!found)
 697         {
 698                 for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
 699                         if (irc::sockets::MatchCIDR(ip, (*i).c_str()))
 700                                 found = true;
 701
 702                 if (!found)
 703                 {
 704                         Utils->Creator->RemoteMessage(NULL,"Server connection from %s denied (no link blocks with that IP address)", ip);
 705                         Instance->SE->Close(newsock);
 706                         return false;
 707                 }
 708         }
 709
 710         TreeSocket* s = new TreeSocket(this->Utils, this->Instance, newsock, ip, this->Hook);
 711         s = s; /* Whinge whinge whinge, thats all GCC ever does. */
 712         return true;
 713 }