src/modules/m_spanningtree/treesocket2.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "socket.h"
  16 #include "xline.h"
  17 #include "../transport.h"
  18 #include "socketengine.h"
  19
  20 #include "main.h"
  21 #include "utils.h"
  22 #include "treeserver.h"
  23 #include "link.h"
  24 #include "treesocket.h"
  25 #include "resolvers.h"
  26 #include "handshaketimer.h"
  27
  28 /* $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 */
  29
  30 /* Handle ERROR command */
  31 bool TreeSocket::Error(parameterlist &params)
  32 {
  33         if (params.size() < 1)
  34                 return false;
  35         ServerInstance->SNO->WriteToSnoMask('l',"ERROR from %s: %s",(!InboundServerName.empty() ? InboundServerName.c_str() : myhost.c_str()),params[0].c_str());
  36         /* we will return false to cause the socket to close. */
  37         return false;
  38 }
  39
  40 void TreeSocket::Split(const std::string &line, parameterlist &n)
  41 {
  42         n.clear();
  43         irc::tokenstream tokens(line);
  44         std::string param;
  45         while (tokens.GetToken(param))
  46         {
  47                 n.push_back(param);
  48         }
  49         return;
  50 }
  51
  52 bool TreeSocket::ProcessLine(std::string &line)
  53 {
  54         parameterlist params;
  55         irc::string command;
  56         std::string prefix;
  57
  58         line = line.substr(0, line.find_first_of("\r\n"));
  59
  60         if (line.empty())
  61                 return true;
  62
  63         ServerInstance->Logs->Log("m_spanningtree",DEBUG, "S[%d] I %s", this->GetFd(), line.c_str());
  64
  65         this->Split(line.c_str(),params);
  66
  67         if (params.empty())
  68                 return true;
  69
  70         if ((params[0][0] == ':') && (params.size() > 1))
  71         {
  72                 prefix = params[0].substr(1);
  73
  74                 if (prefix.empty())
  75                 {
  76                         this->SendError("BUG (?) Empty prefix recieved: " + line);
  77                         return false;
  78                 }
  79                 command = params[1].c_str();
  80                 params.erase(params.begin(), params.begin() + 2);
  81         }
  82         else
  83         {
  84                 command = params[0].c_str();
  85                 params.erase(params.begin());
  86         }
  87
  88         switch (this->LinkState)
  89         {
  90                 TreeServer* Node;
  91
  92                 case WAIT_AUTH_1:
  93                         /*
  94                          * State WAIT_AUTH_1:
  95                          *  Waiting for SERVER command from remote server. Server initiating
  96                          *  the connection sends the first SERVER command, listening server
  97                          *  replies with theirs if its happy, then if the initiator is happy,
  98                          *  it starts to send its net sync, which starts the merge, otherwise
  99                          *  it sends an ERROR.
 100                          */
 101                         if (command == "PASS")
 102                         {
 103                                 /*
 104                                  * Ignore this silently. Some services packages insist on sending PASS, even
 105                                  * when it is not required (i.e. by us). We have to ignore this here, otherwise
 106                                  * as it's an unknown command (effectively), it will cause the connection to be
 107                                  * closed, which probably isn't what people want. -- w00t
 108                                  */
 109                         }
 110                         else if (command == "SERVER")
 111                         {
 112                                 return this->Inbound_Server(params);
 113                         }
 114                         else if (command == "ERROR")
 115                         {
 116                                 return this->Error(params);
 117                         }
 118                         else if (command == "USER")
 119                         {
 120                                 this->SendError("Client connections to this port are prohibited.");
 121                                 return false;
 122                         }
 123                         else if (command == "CAPAB")
 124                         {
 125                                 return this->Capab(params);
 126                         }
 127                         else
 128                         {
 129                                 this->SendError(std::string("Invalid command in negotiation phase: ") + command.c_str());
 130                                 return false;
 131                         }
 132                 break;
 133                 case WAIT_AUTH_2:
 134                         /*
 135                          * State WAIT_AUTH_2:
 136                          *  We have sent SERVER to the other side of the connection. Now we're waiting for them to start BURST.
 137                          *  The other option at this stage of things, of course, is for them to close our connection thanks
 138                          *  to invalid credentials.. -- w
 139                          */
 140                         if (command == "SERVER")
 141                         {
 142                                 /*
 143                                  * Connection is either attempting to re-auth itself (stupid) or sending netburst without sending BURST.
 144                                  * Both of these aren't allowable, so block them here. -- w
 145                                  */
 146                                 this->SendError("You may not re-authenticate or commence netburst without sending BURST.");
 147                                 return true;
 148                         }
 149                         else if (command == "BURST")
 150                         {
 151                                 if (params.size())
 152                                 {
 153                                         time_t them = atoi(params[0].c_str());
 154                                         time_t delta = them - ServerInstance->Time();
 155                                         if ((delta < -600) || (delta > 600))
 156                                         {
 157                                                 ServerInstance->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));
 158                                                 SendError("Your clocks are out by "+ConvToStr(abs((long)delta))+" seconds (this is more than five minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
 159                                                 return false;
 160                                         }
 161                                         else if ((delta < -30) || (delta > 30))
 162                                         {
 163                                                 ServerInstance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your clocks are out by %d seconds. Please consider synching your clocks.", abs((long)delta));
 164                                         }
 165                                 }
 166                                 this->LinkState = CONNECTED;
 167
 168                                 Utils->timeoutlist.erase(this);
 169
 170                                 Link* lnk = Utils->FindLink(InboundServerName);
 171
 172                                 Node = new TreeServer(this->Utils, InboundServerName, InboundDescription, InboundSID, Utils->TreeRoot, this, lnk ? lnk->Hidden : false);
 173
 174                                 Utils->TreeRoot->AddChild(Node);
 175                                 parameterlist sparams;
 176                                 sparams.push_back(InboundServerName);
 177                                 sparams.push_back("*");
 178                                 sparams.push_back("1");
 179                                 sparams.push_back(InboundSID);
 180                                 sparams.push_back(":"+InboundDescription);
 181                                 Utils->DoOneToAllButSender(ServerInstance->Config->GetSID(),"SERVER",sparams,InboundServerName);
 182                                 Utils->DoOneToAllButSenderRaw(line, InboundServerName, prefix, command, params);
 183                                 Node->bursting = true;
 184                                 this->DoBurst(Node);
 185                         }
 186                         else if (command == "ERROR")
 187                         {
 188                                 return this->Error(params);
 189                         }
 190                         else if (command == "CAPAB")
 191                         {
 192                                 return this->Capab(params);
 193                         }
 194
 195                 break;
 196                 case CONNECTING:
 197                         /*
 198                          * State CONNECTING:
 199                          *  We're connecting (OUTGOING) to another server. They are in state WAIT_AUTH_1 until they verify
 200                          *  our credentials, when they proceed into WAIT_AUTH_2 and send SERVER to us. We then send BURST
 201                          *  + our netburst, which will put them into CONNECTED state. -- w
 202                          */
 203                         if (command == "SERVER")
 204                         {
 205                                 // Our credentials have been accepted, send netburst. (this puts US into the CONNECTED state)
 206                                 return this->Outbound_Reply_Server(params);
 207                         }
 208                         else if (command == "ERROR")
 209                         {
 210                                 return this->Error(params);
 211                         }
 212                         else if (command == "CAPAB")
 213                         {
 214                                 return this->Capab(params);
 215                         }
 216                 break;
 217                 case CONNECTED:
 218                         /*
 219                         * State CONNECTED:
 220                          *  Credentials have been exchanged, we've gotten their 'BURST' (or sent ours).
 221                          *  Anything from here on should be accepted a little more reasonably.
 222                          */
 223                         if (!prefix.empty())
 224                         {
 225                                 /*
 226                                  * Check for fake direction here, and drop any instances that are found.
 227                                  * What is fake direction? Imagine the following server setup:
 228                                  *    0AA <-> 0AB <-> 0AC
 229                                  * Fake direction would be 0AC sending a message to 0AB claiming to be from
 230                                  * 0AA, or something similar. Basically, a message taking a path that *cannot*
 231                                  * be correct.
 232                                  *
 233                                  * When would this be seen?
 234                                  * Well, hopefully never. It could be caused by race conditions, bugs, or
 235                                  * "miscreant" servers, though, so let's check anyway. -- w
 236                                  *
 237                                  * We also check here for totally invalid prefixes (prefixes that are neither
 238                                  * a valid SID or a valid UUID, so that invalid UUID or SID never makes it
 239                                  * to the higher level functions. -- B
 240                                  */
 241                                 std::string direction = prefix;
 242
 243                                 User *t = ServerInstance->FindUUID(prefix);
 244                                 if (t)
 245                                 {
 246                                         /* Find UID */
 247                                         direction = t->server;
 248                                 }
 249                                 else if (!this->Utils->FindServer(direction))
 250                                 {
 251                                         /* Find SID */
 252                                         ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Protocol violation: Invalid prefix '%s' from connection '%s'", direction.c_str(), this->GetName().c_str());
 253                                         return true;
 254                                 }
 255
 256                                 TreeServer* route_back_again = Utils->BestRouteTo(direction);
 257                                 if ((!route_back_again) || (route_back_again->GetSocket() != this))
 258                                 {
 259                                         if (route_back_again)
 260                                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
 261                                         return true;
 262                                 }
 263                         }
 264                         else
 265                         {
 266                                 /*
 267                                  * Empty prefix from a server to server link:
 268                                  *  This is somewhat bad/naughty, so let's set the prefix
 269                                  *  to be the link that we got it from, so we don't break anything. -- w
 270                                  */
 271                                 TreeServer* n = Utils->FindServer(GetName());
 272                                 if (n)
 273                                         prefix = n->GetID();
 274                                 else
 275                                         prefix = GetName();
 276                         }
 277
 278                         /*
 279                          * First up, check for any malformed commands (e.g. MODE without a timestamp)
 280                          * and rewrite commands where necessary (SVSMODE -> MODE for services). -- w
 281                          */
 282                         if (command == "SVSMODE") // This isn't in an "else if" so we still force FMODE for changes on channels.
 283                                 command = "MODE";
 284
 285                         /*
 286                          * Now, check for (and parse) commands as appropriate. -- w
 287                          */
 288
 289                         /* Find the server that this command originated from, used in the handlers below */
 290                         TreeServer *ServerSource = Utils->FindServer(prefix);
 291                         if (ServerSource)
 292                         {
 293                                 Utils->ServerUser->SetFakeServer(ServerSource->GetName());
 294                                 Utils->ServerUser->uuid = ServerSource->GetID();
 295                         }
 296
 297                         /* Find the link we just got this from so we don't bounce it back incorrectly */
 298                         std::string sourceserv = this->myhost;
 299                         if (!this->InboundServerName.empty())
 300                         {
 301                                 sourceserv = this->InboundServerName;
 302                         }
 303
 304                         /*
 305                          * XXX one of these days, this needs to be moved into class Commands.
 306                          */
 307                         if (command == "UID")
 308                         {
 309                                 return this->ParseUID(prefix, params);
 310                         }
 311                         else if (command == "FJOIN")
 312                         {
 313                                 return this->ForceJoin(prefix,params);
 314                         }
 315                         else if ((command == "NOTICE" || command == "PRIVMSG") && (Utils->IsServer(prefix)))
 316                         {
 317                                 return ServerMessage(assign(command), prefix, params, sourceserv);
 318                         }
 319                         else if (command == "STATS")
 320                         {
 321                                 return this->Stats(prefix, params);
 322                         }
 323                         else if (command == "MOTD")
 324                         {
 325                                 return this->Motd(prefix, params);
 326                         }
 327                         else if (command == "KILL" && ServerSource)
 328                         {
 329                                 // Kill from a server
 330                                 return this->RemoteKill(prefix,params);
 331                         }
 332                         else if (command == "MODULES")
 333                         {
 334                                 return this->Modules(prefix, params);
 335                         }
 336                         else if (command == "ADMIN")
 337                         {
 338                                 return this->Admin(prefix, params);
 339                         }
 340                         else if (command == "MAP")
 341                         {
 342                                 User* user = ServerInstance->FindNick(prefix);
 343                                 if (user)
 344                                 {
 345                                         return Utils->Creator->HandleMap(params, user);
 346                                 }
 347                         }
 348                         else if (command == "SERVER")
 349                         {
 350                                 return this->RemoteServer(prefix,params);
 351                         }
 352                         else if (command == "ERROR")
 353                         {
 354                                 return this->Error(params);
 355                         }
 356                         else if (command == "OPERTYPE")
 357                         {
 358                                 return this->OperType(prefix,params);
 359                         }
 360                         else if (command == "AWAY")
 361                         {
 362                                 return this->Away(prefix,params);
 363                         }
 364                         else if (command == "FMODE")
 365                         {
 366                                 return this->ForceMode(prefix,params);
 367                         }
 368                         else if (command == "FTOPIC")
 369                         {
 370                                 return this->ForceTopic(prefix,params);
 371                         }
 372                         else if (command == "METADATA")
 373                         {
 374                                 return this->MetaData(prefix,params);
 375                         }
 376                         else if (command == "PING")
 377                         {
 378                                 return this->LocalPing(prefix,params);
 379                         }
 380                         else if (command == "PONG")
 381                         {
 382                                 TreeServer *s = Utils->FindServer(prefix);
 383                                 if (s && s->bursting)
 384                                 {
 385                                         ServerInstance->SNO->WriteToSnoMask('l',"Server \002%s\002 has not finished burst, forcing end of burst (send ENDBURST!)", prefix.c_str());
 386                                         s->FinishBurst();
 387                                 }
 388                                 return this->LocalPong(prefix,params);
 389                         }
 390                         else if (command == "VERSION")
 391                         {
 392                                 return this->ServerVersion(prefix,params);
 393                         }
 394                         else if (command == "FHOST")
 395                         {
 396                                 return this->ChangeHost(prefix,params);
 397                         }
 398                         else if (command == "FNAME")
 399                         {
 400                                 return this->ChangeName(prefix,params);
 401                         }
 402                         else if (command == "FIDENT")
 403                         {
 404                                 return this->ChangeIdent(prefix,params);
 405                         }
 406                         else if (command == "ADDLINE")
 407                         {
 408                                 return this->AddLine(prefix,params);
 409                         }
 410                         else if (command == "DELLINE")
 411                         {
 412                                 return this->DelLine(prefix,params);
 413                         }
 414                         else if (command == "SVSNICK")
 415                         {
 416                                 return this->SVSNick(prefix,params);
 417                         }
 418                         else if (command == "SAVE")
 419                         {
 420                                 return this->ForceNick(prefix,params);
 421                         }
 422                         else if (command == "OPERQUIT")
 423                         {
 424                                 return this->OperQuit(prefix,params);
 425                         }
 426                         else if (command == "IDLE")
 427                         {
 428                                 return this->Whois(prefix,params);
 429                         }
 430                         else if (command == "PUSH")
 431                         {
 432                                 return this->Push(prefix,params);
 433                         }
 434                         else if (command == "TIME")
 435                         {
 436                                 return this->Time(prefix,params);
 437                         }
 438                         else if (command == "SVSJOIN")
 439                         {
 440                                 return this->ServiceJoin(prefix,params);
 441                         }
 442                         else if (command == "SVSPART")
 443                         {
 444                                 return this->ServicePart(prefix,params);
 445                         }
 446                         else if (command == "SQUIT")
 447                         {
 448                                 if (params.size() == 2)
 449                                 {
 450                                         this->Squit(Utils->FindServer(params[0]),params[1]);
 451                                 }
 452                                 return true;
 453                         }
 454                         else if (command == "MODENOTICE")
 455                         {
 456                                 if (params.size() >= 2)
 457                                 {
 458                                         if (ServerSource)
 459                                                 ServerInstance->Users->WriteMode(params[0].c_str(), WM_AND, "*** From %s: %s", (ServerSource ? ServerSource->GetName().c_str() : prefix.c_str()), params[1].c_str());
 460                                 }
 461                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 462                         }
 463                         else if (command == "SNONOTICE")
 464                         {
 465                                 if (params.size() >= 2)
 466                                 {
 467                                         std::string oldprefix;
 468                                         if (!ServerSource)
 469                                         {
 470                                                 oldprefix = prefix;
 471                                                 User *u = ServerInstance->FindNick(prefix);
 472                                                 if (!u)
 473                                                         return true;
 474                                                 prefix = u->nick;
 475                                         }
 476
 477                                         ServerInstance->SNO->WriteToSnoMask(*(params[0].c_str()), "From " + (ServerSource ? ServerSource->GetName().c_str() : prefix) + ": "+ params[1]);
 478                                         prefix = oldprefix;
 479                                         return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 480                                 }
 481
 482                         }
 483                         else if (command == "BURST")
 484                         {
 485                                 // Set prefix server as bursting
 486                                 if (!ServerSource)
 487                                 {
 488                                         ServerInstance->SNO->WriteToSnoMask('l', "WTF: Got BURST from a nonexistant server(?): %s", (ServerSource ? ServerSource->GetName().c_str() : prefix.c_str()));
 489                                         return false;
 490                                 }
 491
 492                                 ServerSource->bursting = true;
 493                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 494                         }
 495                         else if (command == "ENDBURST")
 496                         {
 497                                 if (!ServerSource)
 498                                 {
 499                                         ServerInstance->SNO->WriteToSnoMask('l', "WTF: Got ENDBURST from a nonexistant server(?): %s", (ServerSource ? ServerSource->GetName().c_str() : prefix.c_str()));
 500                                         return false;
 501                                 }
 502
 503                                 ServerSource->FinishBurst();
 504                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 505                         }
 506                         else if (command == "ENCAP")
 507                         {
 508                                 return this->Encap(prefix, params);
 509                         }
 510                         else
 511                         {
 512                                 /*
 513                                  * Not a special s2s command. Emulate the user doing it.
 514                                  * This saves us having a huge ugly command parser again.
 515                                  */
 516                                 User* who = ServerInstance->FindUUID(prefix);
 517
 518                                 if (ServerSource)
 519                                 {
 520                                         who = Utils->ServerUser;
 521                                 }
 522                                 else if (!who)
 523                                 {
 524                                         /* this looks ugly because command is an irc::string
 525                                          * It is important that we dont close the link here, unknown prefix can occur
 526                                          * due to various race conditions such as the KILL message for a user somehow
 527                                          * crossing the users QUIT further upstream from the server. Thanks jilles!
 528                                          */
 529                                         ServerInstance->Logs->Log("m_spanningtree", DEBUG, "Command " + std::string(command.c_str()) + " from unknown prefix " + prefix + "! Dropping entire command.");
 530                                         return true;
 531                                 }
 532
 533                                 if (command == "NICK")
 534                                 {
 535                                         if (params.size() != 2)
 536                                         {
 537                                                 SendError("Protocol violation: NICK message without TS - :"+std::string(who->uuid)+" NICK "+params[0]);
 538                                                 return false;
 539                                         }
 540                                         /* Update timestamp on user when they change nicks */
 541                                         who->age = atoi(params[1].c_str());
 542
 543                                         /*
 544                                          * On nick messages, check that the nick doesnt already exist here.
 545                                          * If it does, perform collision logic.
 546                                          */
 547                                         User* x = ServerInstance->FindNickOnly(params[0]);
 548                                         if ((x) && (x != who))
 549                                         {
 550                                                 int collideret = 0;
 551                                                 /* x is local, who is remote */
 552                                                 collideret = this->DoCollision(x, who->age, who->ident, who->GetIPString(), who->uuid);
 553                                                 if (collideret != 1)
 554                                                 {
 555                                                         /*
 556                                                          * Remote client lost, or both lost, parsing or passing on this
 557                                                          * nickchange would be pointless, as the incoming client's server will
 558                                                          * soon recieve SVSNICK to change its nick to its UID. :) -- w00t
 559                                                          */
 560                                                         return true;
 561                                                 }
 562                                         }
 563                                 }
 564
 565                                 switch (ServerInstance->CallCommandHandler(command.c_str(), params, who))
 566                                 {
 567                                         case CMD_INVALID:
 568                                                 /*
 569                                                  * XXX: command is irc::string, hence ugliness
 570                                                  */
 571                                                 this->SendError("Unrecognised or malformed command '" + std::string(command.c_str()) + "' -- possibly loaded mismatched modules");
 572                                                 return false;
 573                                                 break;
 574                                         case CMD_FAILURE:
 575                                                 /*
 576                                                  * CMD_LOCALONLY is aliased to CMD_FAILURE, so this won't go out onto the network.
 577                                                  */
 578                                                 return true;
 579                                                 break;
 580                                         default:
 581                                                 /* CMD_SUCCESS falls through here */
 582                                                 break;
 583                                 }
 584
 585                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
 586
 587                         }
 588                         return true;
 589                         break; // end of state CONNECTED (phew).
 590         }
 591         return true;
 592 }
 593
 594 std::string TreeSocket::GetName()
 595 {
 596         std::string sourceserv = this->myhost;
 597         if (!this->InboundServerName.empty())
 598         {
 599                 sourceserv = this->InboundServerName;
 600         }
 601         return sourceserv;
 602 }
 603
 604 void TreeSocket::OnTimeout()
 605 {
 606         if (this->LinkState == CONNECTING)
 607         {
 608                 ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Connection to \002%s\002 timed out.", myhost.c_str());
 609                 Utils->DoFailOver(myautoconnect);
 610         }
 611 }
 612
 613 void TreeSocket::Close()
 614 {
 615         this->BufferedSocket::Close();
 616
 617         // Test fix for big fuckup
 618         if (this->LinkState != CONNECTED)
 619                 return;
 620
 621         // Connection closed.
 622         // If the connection is fully up (state CONNECTED)
 623         // then propogate a netsplit to all peers.
 624         std::string quitserver = this->myhost;
 625         if (!this->InboundServerName.empty())
 626         {
 627                 quitserver = this->InboundServerName;
 628         }
 629         TreeServer* s = Utils->FindServer(quitserver);
 630         if (s)
 631         {
 632                 Squit(s,"Remote host closed the connection");
 633         }
 634
 635         if (!quitserver.empty())
 636         {
 637                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to '\2%s\2' failed.",quitserver.c_str());
 638
 639                 time_t server_uptime = ServerInstance->Time() - this->age;
 640                 if (server_uptime)
 641                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to '\2%s\2' was established for %s", quitserver.c_str(), Utils->Creator->TimeToStr(server_uptime).c_str());
 642         }
 643 }