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 int TreeSocket::WriteLine(std::string line)
  36 {
  37         Instance->Log(DEBUG, "S[%d] O %s", this->GetFd(), line.c_str());
  38         line.append("\r\n");
  39         return 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 /** TODO: This creates a total mess of output and needs to really use irc::modestacker.
  54  */
  55 bool TreeSocket::RemoveStatus(const std::string &prefix, std::deque<std::string> &params)
  56 {
  57         if (params.size() < 1)
  58                 return true;
  59         Channel* c = Instance->FindChan(params[0]);
  60         if (c)
  61         {
  62                 for (char modeletter = 'A'; modeletter <= 'z'; modeletter++)
  63                 {
  64                         ModeHandler* mh = Instance->Modes->FindMode(modeletter, MODETYPE_CHANNEL);
  65                         if (mh)
  66                                 mh->RemoveMode(c);
  67                 }
  68         }
  69         return true;
  70 }
  71
  72 bool TreeSocket::RemoteServer(const std::string &prefix, std::deque<std::string> &params)
  73 {
  74         if (params.size() < 5)
  75         {
  76                 SendError("Protocol error - Missing SID");
  77                 return false;
  78         }
  79
  80         std::string servername = params[0];
  81         std::string password = params[1];
  82         // hopcount is not used for a remote server, we calculate this ourselves
  83         std::string sid = params[3];
  84         std::string description = params[4];
  85         TreeServer* ParentOfThis = Utils->FindServer(prefix);
  86         if (!ParentOfThis)
  87         {
  88                 this->SendError("Protocol error - Introduced remote server from unknown server "+prefix);
  89                 return false;
  90         }
  91         if (!this->Instance->IsSID(sid))
  92         {
  93                 this->SendError("Invalid format server ID: "+sid+"!");
  94                 return false;
  95         }
  96         TreeServer* CheckDupe = Utils->FindServer(servername);
  97         if (CheckDupe)
  98         {
  99                 this->SendError("Server "+servername+" already exists!");
 100                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+servername+"\2 being introduced from \2" + prefix + "\2 denied, already exists. Closing link with " + prefix);
 101                 return false;
 102         }
 103
 104         Link* lnk = Utils->FindLink(servername);
 105
 106         TreeServer *Node = new TreeServer(this->Utils, this->Instance, servername, description, sid, ParentOfThis,NULL, lnk ? lnk->Hidden : false);
 107
 108         if (Node->DuplicateID())
 109         {
 110                 this->SendError("Server ID "+sid+" already exists on the network!");
 111                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+servername+"\2 being introduced from \2" + prefix + "\2 denied, server ID already exists on the network. Closing link with " + prefix);
 112                 return false;
 113         }
 114
 115         ParentOfThis->AddChild(Node);
 116         params[4] = ":" + params[4];
 117         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
 118         this->Instance->SNO->WriteToSnoMask('l',"Server \002"+prefix+"\002 introduced server \002"+servername+"\002 ("+description+")");
 119         return true;
 120 }
 121
 122 bool TreeSocket::Outbound_Reply_Server(std::deque<std::string> &params)
 123 {
 124         if (params.size() < 5)
 125         {
 126                 SendError("Protocol error - Missing SID");
 127                 return false;
 128         }
 129
 130         irc::string servername = params[0].c_str();
 131         std::string sname = params[0];
 132         std::string password = params[1];
 133         std::string sid = params[3];
 134         std::string description = params[4];
 135         int hops = atoi(params[2].c_str());
 136
 137         this->InboundServerName = sname;
 138         this->InboundDescription = description;
 139         this->InboundSID = sid;
 140
 141         if (!sentcapab)
 142                 this->SendCapabilities();
 143
 144         if (hops)
 145         {
 146                 this->SendError("Server too far away for authentication");
 147                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 148                 return false;
 149         }
 150
 151         if (!this->Instance->IsSID(sid))
 152         {
 153                 this->SendError("Invalid format server ID: "+sid+"!");
 154                 return false;
 155         }
 156
 157         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 158         {
 159                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password)) || (x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 160                 {
 161                         TreeServer* CheckDupe = Utils->FindServer(sname);
 162                         if (CheckDupe)
 163                         {
 164                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 165                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 166                                 return false;
 167                         }
 168                         // Begin the sync here. this kickstarts the
 169                         // other side, waiting in WAIT_AUTH_2 state,
 170                         // into starting their burst, as it shows
 171                         // that we're happy.
 172                         this->LinkState = CONNECTED;
 173                         // we should add the details of this server now
 174                         // to the servers tree, as a child of the root
 175                         // node.
 176
 177                         TreeServer *Node = new TreeServer(this->Utils, this->Instance, sname, description, sid, Utils->TreeRoot, this, x->Hidden);
 178
 179                         if (Node->DuplicateID())
 180                         {
 181                                 this->SendError("Server ID "+sid+" already exists on the network!");
 182                                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+assign(servername)+"\2 being introduced denied, server ID already exists on the network. Closing link.");
 183                                 return false;
 184                         }
 185
 186                         Utils->TreeRoot->AddChild(Node);
 187                         params[4] = ":" + params[4];
 188                         Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,sname);
 189                         Node->bursting = true;
 190                         this->DoBurst(Node);
 191                         return true;
 192                 }
 193         }
 194         this->SendError("Invalid credentials");
 195         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 196         return false;
 197 }
 198
 199 bool TreeSocket::Inbound_Server(std::deque<std::string> &params)
 200 {
 201         if (params.size() < 5)
 202         {
 203                 SendError("Protocol error - Missing SID");
 204                 return false;
 205         }
 206
 207         irc::string servername = params[0].c_str();
 208         std::string sname = params[0];
 209         std::string password = params[1];
 210         std::string sid = params[3];
 211         std::string description = params[4];
 212         int hops = atoi(params[2].c_str());
 213
 214         this->InboundServerName = sname;
 215         this->InboundDescription = description;
 216         this->InboundSID = sid;
 217
 218         if (!sentcapab)
 219                 this->SendCapabilities();
 220
 221         if (hops)
 222         {
 223                 this->SendError("Server too far away for authentication");
 224                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 225                 return false;
 226         }
 227
 228         if (!this->Instance->IsSID(sid))
 229         {
 230                 this->SendError("Invalid format server ID: "+sid+"!");
 231                 return false;
 232         }
 233
 234         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 235         {
 236                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password) || x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 237                 {
 238                         /* Check for fully initialized instances of the server by id */
 239                         Instance->Log(DEBUG,"Looking for dupe SID %s", sid.c_str());
 240                         TreeServer* CheckDupeSID = Utils->FindServerID(sid);
 241                         if (CheckDupeSID)
 242                         {
 243                                 this->SendError("Server ID "+CheckDupeSID->GetID()+" already exists on server "+CheckDupeSID->GetName()+"!");
 244                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server ID '"+CheckDupeSID->GetID()+
 245                                                 "' already exists on server "+CheckDupeSID->GetName());
 246                                 return false;
 247                         }
 248                         /* Now check for fully initialized instances of the server by name */
 249                         TreeServer* CheckDupe = Utils->FindServer(sname);
 250                         if (CheckDupe)
 251                         {
 252                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 253                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 254                                 return false;
 255                         }
 256                         this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
 257                         if (this->Hook)
 258                         {
 259                                 std::string name = BufferedSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
 260                                 this->Instance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
 261                         }
 262
 263                         // this is good. Send our details: Our server name and description and hopcount of 0,
 264                         // along with the sendpass from this block.
 265                         this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 266                         // move to the next state, we are now waiting for THEM.
 267                         this->LinkState = WAIT_AUTH_2;
 268                         return true;
 269                 }
 270         }
 271         this->SendError("Invalid credentials");
 272         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 273         return false;
 274 }
 275
 276 void TreeSocket::Split(const std::string &line, std::deque<std::string> &n)
 277 {
 278         n.clear();
 279         irc::tokenstream tokens(line);
 280         std::string param;
 281         while (tokens.GetToken(param))
 282         {
 283                 n.push_back(param);
 284         }
 285         return;
 286 }
 287
 288 bool TreeSocket::ProcessLine(std::string &line)
 289 {
 290         std::deque<std::string> params;
 291         irc::string command;
 292         std::string prefix;
 293
 294         line = line.substr(0, line.find_first_of("\r\n"));
 295
 296         if (line.empty())
 297                 return true;
 298
 299         Instance->Log(DEBUG, "S[%d] I %s", this->GetFd(), line.c_str());
 300
 301         this->Split(line.c_str(),params);
 302
 303         if (params.empty())
 304                 return true;
 305
 306         if ((params[0][0] == ':') && (params.size() > 1))
 307         {
 308                 prefix = params[0].substr(1);
 309                 params.pop_front();
 310
 311                 if (prefix.empty())
 312                 {
 313                         this->SendError("BUG (?) Empty prefix recieved.");
 314                         return false;
 315                 }
 316         }
 317
 318         command = params[0].c_str();
 319         params.pop_front();
 320
 321         switch (this->LinkState)
 322         {
 323                 TreeServer* Node;
 324
 325                 case WAIT_AUTH_1:
 326                         /*
 327                          * State WAIT_AUTH_1:
 328                          *  Waiting for SERVER command from remote server. Server initiating
 329                          *  the connection sends the first SERVER command, listening server
 330                          *  replies with theirs if its happy, then if the initiator is happy,
 331                          *  it starts to send its net sync, which starts the merge, otherwise
 332                          *  it sends an ERROR.
 333                          */
 334                         if (command == "PASS")
 335                         {
 336                                 /*
 337                                  * Ignore this silently. Some services packages insist on sending PASS, even
 338                                  * when it is not required (i.e. by us). We have to ignore this here, otherwise
 339                                  * as it's an unknown command (effectively), it will cause the connection to be
 340                                  * closed, which probably isn't what people want. -- w00t
 341                                  */
 342                         }
 343                         else if (command == "SERVER")
 344                         {
 345                                 return this->Inbound_Server(params);
 346                         }
 347                         else if (command == "ERROR")
 348                         {
 349                                 return this->Error(params);
 350                         }
 351                         else if (command == "USER")
 352                         {
 353                                 this->SendError("Client connections to this port are prohibited.");
 354                                 return false;
 355                         }
 356                         else if (command == "CAPAB")
 357                         {
 358                                 return this->Capab(params);
 359                         }
 360                         else
 361                         {
 362                                 // XXX ...wtf.
 363                                 irc::string error = "Invalid command in negotiation phase: " + command;
 364                                 this->SendError(assign(error));
 365                                 return false;
 366                         }
 367                 break;
 368                 case WAIT_AUTH_2:
 369                         /*
 370                          * State WAIT_AUTH_2:
 371                          *  We have sent SERVER to the other side of the connection. Now we're waiting for them to start BURST.
 372                          *  The other option at this stage of things, of course, is for them to close our connection thanks
 373                          *  to invalid credentials.. -- w
 374                          */
 375                         if (command == "SERVER")
 376                         {
 377                                 /*
 378                                  * Connection is either attempting to re-auth itself (stupid) or sending netburst without sending BURST.
 379                                  * Both of these aren't allowable, so block them here. -- w
 380                                  */
 381                                 this->SendError("You may not re-authenticate or commence netburst without sending BURST.");
 382                                 return true;
 383                         }
 384                         else if (command == "BURST")
 385                         {
 386                                 if (params.size() && Utils->EnableTimeSync)
 387                                 {
 388                                         bool we_have_delta = (Instance->Time(false) != Instance->Time(true));
 389                                         time_t them = atoi(params[0].c_str());
 390                                         time_t delta = them - Instance->Time(false);
 391                                         if ((delta < -600) || (delta > 600))
 392                                         {
 393                                                 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));
 394                                                 SendError("Your clocks are out by "+ConvToStr(abs(delta))+" seconds (this is more than five minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
 395                                                 return false;
 396                                         }
 397                                         else if ((delta < -30) || (delta > 30))
 398                                         {
 399                                                 Instance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your clocks are out by %d seconds. Please consider synching your clocks.", abs(delta));
 400                                         }
 401
 402                                         if (!Utils->MasterTime && !we_have_delta)
 403                                         {
 404                                                 this->Instance->SetTimeDelta(delta);
 405                                                 // Send this new timestamp to any other servers
 406                                                 Utils->DoOneToMany(Instance->Config->GetSID(), "TIMESET", params);
 407                                         }
 408                                 }
 409                                 this->LinkState = CONNECTED;
 410                                 Link* lnk = Utils->FindLink(InboundServerName);
 411
 412                                 Node = new TreeServer(this->Utils, this->Instance, InboundServerName, InboundDescription, InboundSID, Utils->TreeRoot, this, lnk ? lnk->Hidden : false);
 413
 414                                 if (Node->DuplicateID())
 415                                 {
 416                                         this->SendError("Server ID "+InboundSID+" already exists on the network!");
 417                                         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.");
 418                                         return false;
 419                                 }
 420
 421                                 Utils->TreeRoot->AddChild(Node);
 422                                 params.clear();
 423                                 params.push_back(InboundServerName);
 424                                 params.push_back("*");
 425                                 params.push_back("1");
 426                                 params.push_back(InboundSID);
 427                                 params.push_back(":"+InboundDescription);
 428                                 Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,InboundServerName);
 429                                 Node->bursting = true;
 430                                 this->DoBurst(Node);
 431                         }
 432                         else if (command == "ERROR")
 433                         {
 434                                 return this->Error(params);
 435                         }
 436                         else if (command == "CAPAB")
 437                         {
 438                                 return this->Capab(params);
 439                         }
 440
 441                 break;
 442                 case LISTENER:
 443                         /*
 444                          * This really shouldn't happen.
 445                          */
 446                         this->SendError("Internal error -- listening socket accepted its own descriptor!!!");
 447                         return false;
 448                 break;
 449                 case CONNECTING:
 450                         /*
 451                          * State CONNECTING:
 452                          *  We're connecting (OUTGOING) to another server. They are in state WAIT_AUTH_1 until they verify
 453                          *  our credentials, when they proceed into WAIT_AUTH_2 and send SERVER to us. We then send BURST
 454                          *  + our netburst, which will put them into CONNECTED state. -- w
 455                          */
 456                         if (command == "SERVER")
 457                         {
 458                                 // Our credentials have been accepted, send netburst. (this puts US into the CONNECTED state)
 459                                 return this->Outbound_Reply_Server(params);
 460                         }
 461                         else if (command == "ERROR")
 462                         {
 463                                 return this->Error(params);
 464                         }
 465                         else if (command == "CAPAB")
 466                         {
 467                                 return this->Capab(params);
 468                         }
 469                 break;
 470                 case CONNECTED:
 471                         /*
 472                         * State CONNECTED:
 473                          *  Credentials have been exchanged, we've gotten their 'BURST' (or sent ours).
 474                          *  Anything from here on should be accepted a little more reasonably.
 475                          */
 476                         if (!prefix.empty())
 477                         {
 478                                 /*
 479                                  * Check for fake direction here, and drop any instances that are found.
 480                                  * What is fake direction? Imagine the following server setup:
 481                                  *    0AA <-> 0AB <-> 0AC
 482                                  * Fake direction would be 0AC sending a message to 0AB claiming to be from
 483                                  * 0AA, or something similar. Basically, a message taking a path that *cannot*
 484                                  * be correct.
 485                                  *
 486                                  * When would this be seen?
 487                                  * Well, hopefully never. It could be caused by race conditions, bugs, or
 488                                  * "miscreant" servers, though, so let's check anyway. -- w
 489                                  */
 490                                 std::string direction = prefix;
 491
 492                                 User *t = this->Instance->FindUUID(prefix);
 493                                 if (t)
 494                                 {
 495                                         direction = t->server;
 496                                 }
 497
 498                                 TreeServer* route_back_again = Utils->BestRouteTo(direction);
 499                                 if ((!route_back_again) || (route_back_again->GetSocket() != this))
 500                                 {
 501                                         if (route_back_again)
 502                                                 Instance->Log(DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
 503                                         return true;
 504                                 }
 505                                 /* Fix by brain:
 506                                  * When there is activity on the socket, reset the ping counter so
 507                                  * that we're not wasting bandwidth pinging an active server.
 508                                  */
 509                                 route_back_again->SetNextPingTime(time(NULL) + Utils->PingFreq);
 510                                 route_back_again->SetPingFlag();
 511                         }
 512                         else
 513                         {
 514                                 /*
 515                                  * Empty prefix from a server to server link:
 516                                  *  This is somewhat bad/naughty, so let's set the prefix
 517                                  *  to be the link that we got it from, so we don't break anything. -- w
 518                                  */
 519                                 TreeServer* n = Utils->FindServer(GetName());
 520                                 if (n)
 521                                         prefix = n->GetID();
 522                                 else
 523                                         prefix = GetName();
 524                         }
 525
 526                         /*
 527                          * First up, check for any malformed commands (e.g. MODE without a timestamp)
 528                          * and rewrite commands where necessary (SVSMODE -> MODE for services). -- w
 529                          */
 530                         if (command == "MODE")
 531                         {
 532                                 if (params.size() >= 2)
 533                                 {
 534                                         Channel* channel = Instance->FindChan(params[0]);
 535                                         if (channel)
 536                                         {
 537                                                 User* x = Instance->FindNick(prefix);
 538                                                 if (x)
 539                                                 {
 540                                                         if (warned.find(x->server) == warned.end())
 541                                                         {
 542                                                                 Instance->Log(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);
 543                                                                 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());
 544                                                                 warned[x->server] = x->nick;
 545                                                         }
 546                                                 }
 547                                         }
 548                                 }
 549                         }
 550                         else if (command == "SVSMODE")
 551                         {
 552                                 command = "MODE";
 553                         }
 554
 555
 556                         /*
 557                          * Now, check for (and parse) commands as appropriate. -- w
 558                          */
 559
 560                         /* Find the server that this command originated from, used in the handlers below */
 561                         TreeServer *ServerSource = Utils->FindServer(prefix);
 562
 563                         /* Find the link we just got this from so we don't bounce it back incorrectly */
 564                         std::string sourceserv = this->myhost;
 565                         if (!this->InboundServerName.empty())
 566                         {
 567                                 sourceserv = this->InboundServerName;
 568                         }
 569
 570                         /*
 571                          * XXX one of these days, this needs to be moved into class Commands.
 572                          */
 573                         if (command == "UID")
 574                         {
 575                                 return this->ParseUID(prefix, params);
 576                         }
 577                         else if (command == "FJOIN")
 578                         {
 579                                 return this->ForceJoin(prefix,params);
 580                         }
 581                         else if (command == "STATS")
 582                         {
 583                                 return this->Stats(prefix, params);
 584                         }
 585                         else if (command == "MOTD")
 586                         {
 587                                 return this->Motd(prefix, params);
 588                         }
 589                         else if (command == "KILL" && ServerSource)
 590                         {
 591                                 // Kill from a server
 592                                 return this->RemoteKill(prefix,params);
 593                         }
 594                         else if (command == "MODULES")
 595                         {
 596                                 return this->Modules(prefix, params);
 597                         }
 598                         else if (command == "ADMIN")
 599                         {
 600                                 return this->Admin(prefix, params);
 601                         }
 602                         else if (command == "SERVER")
 603                         {
 604                                 return this->RemoteServer(prefix,params);
 605                         }
 606                         else if (command == "ERROR")
 607                         {
 608                                 return this->Error(params);
 609                         }
 610                         else if (command == "OPERTYPE")
 611                         {
 612                                 return this->OperType(prefix,params);
 613                         }
 614                         else if (command == "FMODE")
 615                         {
 616                                 return this->ForceMode(prefix,params);
 617                         }
 618                         else if (command == "FTOPIC")
 619                         {
 620                                 return this->ForceTopic(prefix,params);
 621                         }
 622                         else if (command == "REHASH")
 623                         {
 624                                 return this->RemoteRehash(prefix,params);
 625                         }
 626                         else if (command == "METADATA")
 627                         {
 628                                 return this->MetaData(prefix,params);
 629                         }
 630                         else if (command == "REMSTATUS")
 631                         {
 632                                 return this->RemoveStatus(prefix,params);
 633                         }
 634                         else if (command == "PING")
 635                         {
 636                                 return this->LocalPing(prefix,params);
 637                         }
 638                         else if (command == "PONG")
 639                         {
 640                                 return this->LocalPong(prefix,params);
 641                         }
 642                         else if (command == "VERSION")
 643                         {
 644                                 return this->ServerVersion(prefix,params);
 645                         }
 646                         else if (command == "FHOST")
 647                         {
 648                                 return this->ChangeHost(prefix,params);
 649                         }
 650                         else if (command == "FNAME")
 651                         {
 652                                 return this->ChangeName(prefix,params);
 653                         }
 654                         else if (command == "ADDLINE")
 655                         {
 656                                 return this->AddLine(prefix,params);
 657                         }
 658                         else if (command == "DELLINE")
 659                         {
 660                                 return this->DelLine(prefix,params);
 661                         }
 662                         else if (command == "SVSNICK")
 663                         {
 664                                 return this->ForceNick(prefix,params);
 665                         }
 666                         else if (command == "OPERQUIT")
 667                         {
 668                                 return this->OperQuit(prefix,params);
 669                         }
 670                         else if (command == "IDLE")
 671                         {
 672                                 return this->Whois(prefix,params);
 673                         }
 674                         else if (command == "PUSH")
 675                         {
 676                                 return this->Push(prefix,params);
 677                         }
 678                         else if (command == "TIMESET")
 679                         {
 680                                 return this->HandleSetTime(prefix, params);
 681                         }
 682                         else if (command == "TIME")
 683                         {
 684                                 return this->Time(prefix,params);
 685                         }
 686                         else if ((command == "KICK") && (Utils->IsServer(prefix)))
 687                         {
 688                                 if (params.size() == 3)
 689                                 {
 690                                         User* user = this->Instance->FindNick(params[1]);
 691                                         Channel* chan = this->Instance->FindChan(params[0]);
 692                                         if (user && chan)
 693                                         {
 694                                                 if (!chan->ServerKickUser(user, params[2].c_str(), false))
 695                                                         /* Yikes, the channels gone! */
 696                                                         delete chan;
 697                                         }
 698                                 }
 699
 700                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
 701                         }
 702                         else if (command == "SVSJOIN")
 703                         {
 704                                 return this->ServiceJoin(prefix,params);
 705                         }
 706                         else if (command == "SVSPART")
 707                         {
 708                                 return this->ServicePart(prefix,params);
 709                         }
 710                         else if (command == "SQUIT")
 711                         {
 712                                 if (params.size() == 2)
 713                                 {
 714                                         this->Squit(Utils->FindServer(params[0]),params[1]);
 715                                 }
 716                                 return true;
 717                         }
 718                         else if (command == "OPERNOTICE")
 719                         {
 720                                 if (params.size() >= 1)
 721                                         Instance->SNO->WriteToSnoMask('A', "From " + prefix + ": " + params[0]);
 722                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 723                         }
 724                         else if (command == "MODENOTICE")
 725                         {
 726                                 if (params.size() >= 2)
 727                                 {
 728                                         Instance->Users->WriteMode(params[0].c_str(), WM_AND, "*** From %s: %s", prefix.c_str(), params[1].c_str());
 729                                 }
 730                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 731                         }
 732                         else if (command == "SNONOTICE")
 733                         {
 734                                 if (params.size() >= 2)
 735                                 {
 736                                         Instance->SNO->WriteToSnoMask(*(params[0].c_str()), "From " + prefix + ": "+ params[1]);
 737                                 }
 738                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 739                         }
 740                         else if (command == "BURST")
 741                         {
 742                                 // Set prefix server as bursting
 743                                 if (!ServerSource)
 744                                 {
 745                                         this->Instance->SNO->WriteToSnoMask('l', "WTF: Got BURST from a nonexistant server(?): %s", prefix.c_str());
 746                                         return false;
 747                                 }
 748
 749                                 ServerSource->bursting = true;
 750                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 751                         }
 752                         else if (command == "ENDBURST")
 753                         {
 754                                 if (!ServerSource)
 755                                 {
 756                                         this->Instance->SNO->WriteToSnoMask('l', "WTF: Got ENDBURST from a nonexistant server(?): %s", prefix.c_str());
 757                                         return false;
 758                                 }
 759
 760                                 ServerSource->FinishBurst();
 761                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 762                         }
 763                         else if (command == "MODE")
 764                         {
 765                                 // Server-prefix MODE.
 766                                 const char* modelist[MAXPARAMETERS];
 767                                 for (size_t i = 0; i < params.size(); i++)
 768                                         modelist[i] = params[i].c_str();
 769
 770                                 // Insert into the parser
 771                                 this->Instance->SendMode(modelist, params.size(), this->Instance->FakeClient);
 772
 773                                 // Pass out to the network
 774                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
 775                         }
 776                         else
 777                         {
 778                                 /*
 779                                  * Not a special s2s command. Emulate the user doing it.
 780                                  * This saves us having a huge ugly command parser again.
 781                                  */
 782                                 User *who = this->Instance->FindUUID(prefix);
 783
 784                                 if (!who)
 785                                 {
 786                                         // this looks ugly because command is an irc::string
 787                                         this->SendError("Command (" + std::string(command.c_str()) + ") from unknown prefix (" + prefix + ")! Dropping link.");
 788                                         return false;
 789                                 }
 790
 791                                 if (command == "NICK")
 792                                 {
 793                                         if (params.size() != 2)
 794                                         {
 795                                                 SendError("Protocol violation: NICK message without TS - :"+std::string(who->uuid)+" NICK "+params[0]);
 796                                                 return false;
 797                                         }
 798                                         /* Update timestamp on user when they change nicks */
 799                                         who->age = atoi(params[1].c_str());
 800
 801                                         /*
 802                                          * On nick messages, check that the nick doesnt already exist here.
 803                                          * If it does, perform collision logic.
 804                                          */
 805                                         User* x = this->Instance->FindNickOnly(params[0]);
 806                                         if ((x) && (x != who))
 807                                         {
 808                                                 int collideret = 0;
 809                                                 /* x is local, who is remote */
 810                                                 collideret = this->DoCollision(x, who->age, who->ident, who->GetIPString(), who->uuid);
 811                                                 if (collideret != 1)
 812                                                 {
 813                                                         /*
 814                                                          * Remote client lost, or both lost, parsing this nickchange would be
 815                                                          * pointless, as the incoming client's server will soon recieve SVSNICK to
 816                                                          * change its nick to its UID. :) -- w00t
 817                                                          */
 818                                                         return true;
 819                                                 }
 820                                         }
 821                                 }
 822
 823                                 // its a user
 824                                 const char* strparams[127];
 825                                 for (unsigned int q = 0; q < params.size(); q++)
 826                                 {
 827                                         strparams[q] = params[q].c_str();
 828                                 }
 829
 830                                 switch (this->Instance->CallCommandHandler(command.c_str(), strparams, params.size(), who))
 831                                 {
 832                                         case CMD_INVALID:
 833                                                 // command is irc::string, hence ugliness
 834                                                 this->SendError("Unrecognised or malformed command '" + std::string(command.c_str()) + "' -- possibly loaded mismatched modules");
 835                                                 return false;
 836                                                 break;
 837                                         /*
 838                                          * CMD_LOCALONLY is aliased to CMD_FAILURE, so this won't go out onto the network.
 839                                          */
 840                                         case CMD_FAILURE:
 841                                                 return true;
 842                                                 break;
 843                                         default:
 844                                                 /* CMD_SUCCESS and CMD_USER_DELETED fall through here */
 845                                                 break;
 846                                 }
 847
 848                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
 849
 850                         }
 851                         return true;
 852                         break; // end of state CONNECTED (phew).
 853         }
 854         return true;
 855 }
 856
 857 std::string TreeSocket::GetName()
 858 {
 859         std::string sourceserv = this->myhost;
 860         if (!this->InboundServerName.empty())
 861         {
 862                 sourceserv = this->InboundServerName;
 863         }
 864         return sourceserv;
 865 }
 866
 867 void TreeSocket::OnTimeout()
 868 {
 869         if (this->LinkState == CONNECTING)
 870         {
 871                 Utils->Creator->RemoteMessage(NULL, "CONNECT: Connection to \002%s\002 timed out.", myhost.c_str());
 872                 Link* MyLink = Utils->FindLink(myhost);
 873                 if (MyLink)
 874                         Utils->DoFailOver(MyLink);
 875         }
 876 }
 877
 878 void TreeSocket::OnClose()
 879 {
 880         // Test fix for big fuckup
 881         if (this->LinkState != CONNECTED)
 882                 return;
 883
 884         // Connection closed.
 885         // If the connection is fully up (state CONNECTED)
 886         // then propogate a netsplit to all peers.
 887         std::string quitserver = this->myhost;
 888         if (!this->InboundServerName.empty())
 889         {
 890                 quitserver = this->InboundServerName;
 891         }
 892         TreeServer* s = Utils->FindServer(quitserver);
 893         if (s)
 894         {
 895                 Squit(s,"Remote host closed the connection");
 896         }
 897
 898         if (!quitserver.empty())
 899         {
 900                 Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' failed.",quitserver.c_str());
 901                 time_t server_uptime = Instance->Time() - this->age;
 902                 if (server_uptime)
 903                         Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' was established for %s", quitserver.c_str(), Utils->Creator->TimeToStr(server_uptime).c_str());
 904         }
 905 }
 906
 907 int TreeSocket::OnIncomingConnection(int newsock, char* ip)
 908 {
 909         /* To prevent anyone from attempting to flood opers/DDoS by connecting to the server port,
 910          * or discovering if this port is the server port, we don't allow connections from any
 911          * IPs for which we don't have a link block.
 912          */
 913         bool found = false;
 914
 915         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
 916         if (!found)
 917         {
 918                 for (std::vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
 919                         if (irc::sockets::MatchCIDR(ip, (*i).c_str()))
 920                                 found = true;
 921
 922                 if (!found)
 923                 {
 924                         Utils->Creator->RemoteMessage(NULL,"Server connection from %s denied (no link blocks with that IP address)", ip);
 925                         Instance->SE->Close(newsock);
 926                         return false;
 927                 }
 928         }
 929
 930         TreeSocket* s = new TreeSocket(this->Utils, this->Instance, newsock, ip, this->Hook);
 931         s = s; /* Whinge whinge whinge, thats all GCC ever does. */
 932         return true;
 933 }