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