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