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 void TreeSocket::WriteLine(std::string line)
  33 {
  34         ServerInstance->Logs->Log("m_spanningtree",DEBUG, "S[%d] O %s", this->GetFd(), line.c_str());
  35         line.append("\r\n");
  36         this->Write(line);
  37 }
  38
  39
  40 /* Handle ERROR command */
  41 bool TreeSocket::Error(parameterlist &params)
  42 {
  43         if (params.size() < 1)
  44                 return false;
  45         this->ServerInstance->SNO->WriteToSnoMask('l',"ERROR from %s: %s",(!InboundServerName.empty() ? InboundServerName.c_str() : myhost.c_str()),params[0].c_str());
  46         /* we will return false to cause the socket to close. */
  47         return false;
  48 }
  49
  50 void TreeSocket::Split(const std::string &line, parameterlist &n)
  51 {
  52         n.clear();
  53         irc::tokenstream tokens(line);
  54         std::string param;
  55         while (tokens.GetToken(param))
  56         {
  57                 n.push_back(param);
  58         }
  59         return;
  60 }
  61
  62 bool TreeSocket::ProcessLine(std::string &line)
  63 {
  64         parameterlist params;
  65         irc::string command;
  66         std::string prefix;
  67
  68         line = line.substr(0, line.find_first_of("\r\n"));
  69
  70         if (line.empty())
  71                 return true;
  72
  73         ServerInstance->Logs->Log("m_spanningtree",DEBUG, "S[%d] I %s", this->GetFd(), line.c_str());
  74
  75         this->Split(line.c_str(),params);
  76
  77         if (params.empty())
  78                 return true;
  79
  80         if ((params[0][0] == ':') && (params.size() > 1))
  81         {
  82                 prefix = params[0].substr(1);
  83
  84                 if (prefix.empty())
  85                 {
  86                         this->SendError("BUG (?) Empty prefix recieved: " + line);
  87                         return false;
  88                 }
  89                 command = params[1].c_str();
  90                 params.erase(params.begin(), params.begin() + 2);
  91         }
  92         else
  93         {
  94                 command = params[0].c_str();
  95                 params.erase(params.begin());
  96         }
  97
  98         switch (this->LinkState)
  99         {
 100                 TreeServer* Node;
 101
 102                 case WAIT_AUTH_1:
 103                         /*
 104                          * State WAIT_AUTH_1:
 105                          *  Waiting for SERVER command from remote server. Server initiating
 106                          *  the connection sends the first SERVER command, listening server
 107                          *  replies with theirs if its happy, then if the initiator is happy,
 108                          *  it starts to send its net sync, which starts the merge, otherwise
 109                          *  it sends an ERROR.
 110                          */
 111                         if (command == "PASS")
 112                         {
 113                                 /*
 114                                  * Ignore this silently. Some services packages insist on sending PASS, even
 115                                  * when it is not required (i.e. by us). We have to ignore this here, otherwise
 116                                  * as it's an unknown command (effectively), it will cause the connection to be
 117                                  * closed, which probably isn't what people want. -- w00t
 118                                  */
 119                         }
 120                         else if (command == "SERVER")
 121                         {
 122                                 return this->Inbound_Server(params);
 123                         }
 124                         else if (command == "ERROR")
 125                         {
 126                                 return this->Error(params);
 127                         }
 128                         else if (command == "USER")
 129                         {
 130                                 this->SendError("Client connections to this port are prohibited.");
 131                                 return false;
 132                         }
 133                         else if (command == "CAPAB")
 134                         {
 135                                 return this->Capab(params);
 136                         }
 137                         else
 138                         {
 139                                 // XXX ...wtf.
 140                                 irc::string error = "Invalid command in negotiation phase: " + command;
 141                                 this->SendError(assign(error));
 142                                 return false;
 143                         }
 144                 break;
 145                 case WAIT_AUTH_2:
 146                         /*
 147                          * State WAIT_AUTH_2:
 148                          *  We have sent SERVER to the other side of the connection. Now we're waiting for them to start BURST.
 149                          *  The other option at this stage of things, of course, is for them to close our connection thanks
 150                          *  to invalid credentials.. -- w
 151                          */
 152                         if (command == "SERVER")
 153                         {
 154                                 /*
 155                                  * Connection is either attempting to re-auth itself (stupid) or sending netburst without sending BURST.
 156                                  * Both of these aren't allowable, so block them here. -- w
 157                                  */
 158                                 this->SendError("You may not re-authenticate or commence netburst without sending BURST.");
 159                                 return true;
 160                         }
 161                         else if (command == "BURST")
 162                         {
 163                                 if (params.size())
 164                                 {
 165                                         time_t them = atoi(params[0].c_str());
 166                                         time_t delta = them - ServerInstance->Time();
 167                                         if ((delta < -600) || (delta > 600))
 168                                         {
 169                                                 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));
 170                                                 SendError("Your clocks are out by "+ConvToStr(abs((long)delta))+" seconds (this is more than five minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
 171                                                 return false;
 172                                         }
 173                                         else if ((delta < -30) || (delta > 30))
 174                                         {
 175                                                 ServerInstance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your clocks are out by %d seconds. Please consider synching your clocks.", abs((long)delta));
 176                                         }
 177                                 }
 178                                 this->LinkState = CONNECTED;
 179
 180                                 Utils->timeoutlist.erase(this);
 181
 182                                 Link* lnk = Utils->FindLink(InboundServerName);
 183
 184                                 Node = new TreeServer(this->Utils, this->ServerInstance, InboundServerName, InboundDescription, InboundSID, Utils->TreeRoot, this, lnk ? lnk->Hidden : false);
 185
 186                                 Utils->TreeRoot->AddChild(Node);
 187                                 parameterlist sparams;
 188                                 sparams.push_back(InboundServerName);
 189                                 sparams.push_back("*");
 190                                 sparams.push_back("1");
 191                                 sparams.push_back(InboundSID);
 192                                 sparams.push_back(":"+InboundDescription);
 193                                 Utils->DoOneToAllButSender(ServerInstance->Config->GetSID(),"SERVER",sparams,InboundServerName);
 194                                 Utils->DoOneToAllButSenderRaw(line, InboundServerName, prefix, command, params);
 195                                 Node->bursting = true;
 196                                 this->DoBurst(Node);
 197                         }
 198                         else if (command == "ERROR")
 199                         {
 200                                 return this->Error(params);
 201                         }
 202                         else if (command == "CAPAB")
 203                         {
 204                                 return this->Capab(params);
 205                         }
 206
 207                 break;
 208                 case CONNECTING:
 209                         /*
 210                          * State CONNECTING:
 211                          *  We're connecting (OUTGOING) to another server. They are in state WAIT_AUTH_1 until they verify
 212                          *  our credentials, when they proceed into WAIT_AUTH_2 and send SERVER to us. We then send BURST
 213                          *  + our netburst, which will put them into CONNECTED state. -- w
 214                          */
 215                         if (command == "SERVER")
 216                         {
 217                                 // Our credentials have been accepted, send netburst. (this puts US into the CONNECTED state)
 218                                 return this->Outbound_Reply_Server(params);
 219                         }
 220                         else if (command == "ERROR")
 221                         {
 222                                 return this->Error(params);
 223                         }
 224                         else if (command == "CAPAB")
 225                         {
 226                                 return this->Capab(params);
 227                         }
 228                 break;
 229                 case CONNECTED:
 230                         /*
 231                         * State CONNECTED:
 232                          *  Credentials have been exchanged, we've gotten their 'BURST' (or sent ours).
 233                          *  Anything from here on should be accepted a little more reasonably.
 234                          */
 235                         if (!prefix.empty())
 236                         {
 237                                 /*
 238                                  * Check for fake direction here, and drop any instances that are found.
 239                                  * What is fake direction? Imagine the following server setup:
 240                                  *    0AA <-> 0AB <-> 0AC
 241                                  * Fake direction would be 0AC sending a message to 0AB claiming to be from
 242                                  * 0AA, or something similar. Basically, a message taking a path that *cannot*
 243                                  * be correct.
 244                                  *
 245                                  * When would this be seen?
 246                                  * Well, hopefully never. It could be caused by race conditions, bugs, or
 247                                  * "miscreant" servers, though, so let's check anyway. -- w
 248                                  *
 249                                  * We also check here for totally invalid prefixes (prefixes that are neither
 250                                  * a valid SID or a valid UUID, so that invalid UUID or SID never makes it
 251                                  * to the higher level functions. -- B
 252                                  */
 253                                 std::string direction = prefix;
 254
 255                                 User *t = this->ServerInstance->FindUUID(prefix);
 256                                 if (t)
 257                                 {
 258                                         /* Find UID */
 259                                         direction = t->server;
 260                                 }
 261                                 else if (!this->Utils->FindServer(direction))
 262                                 {
 263                                         /* Find SID */
 264                                         ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Protocol violation: Invalid prefix '%s' from connection '%s'", direction.c_str(), this->GetName().c_str());
 265                                         return true;
 266                                 }
 267
 268                                 TreeServer* route_back_again = Utils->BestRouteTo(direction);
 269                                 if ((!route_back_again) || (route_back_again->GetSocket() != this))
 270                                 {
 271                                         if (route_back_again)
 272                                                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
 273                                         return true;
 274                                 }
 275                         }
 276                         else
 277                         {
 278                                 /*
 279                                  * Empty prefix from a server to server link:
 280                                  *  This is somewhat bad/naughty, so let's set the prefix
 281                                  *  to be the link that we got it from, so we don't break anything. -- w
 282                                  */
 283                                 TreeServer* n = Utils->FindServer(GetName());
 284                                 if (n)
 285                                         prefix = n->GetID();
 286                                 else
 287                                         prefix = GetName();
 288                         }
 289
 290                         /*
 291                          * First up, check for any malformed commands (e.g. MODE without a timestamp)
 292                          * and rewrite commands where necessary (SVSMODE -> MODE for services). -- w
 293                          */
 294                         if (command == "SVSMODE") // This isn't in an "else if" so we still force FMODE for changes on channels.
 295                                 command = "MODE";
 296
 297                         /*
 298                          * Now, check for (and parse) commands as appropriate. -- w
 299                          */
 300
 301                         /* Find the server that this command originated from, used in the handlers below */
 302                         TreeServer *ServerSource = Utils->FindServer(prefix);
 303                         if (ServerSource)
 304                         {
 305                                 Utils->ServerUser->SetFakeServer(ServerSource->GetName());
 306                                 Utils->ServerUser->uuid = ServerSource->GetID();
 307                         }
 308
 309                         /* Find the link we just got this from so we don't bounce it back incorrectly */
 310                         std::string sourceserv = this->myhost;
 311                         if (!this->InboundServerName.empty())
 312                         {
 313                                 sourceserv = this->InboundServerName;
 314                         }
 315
 316                         /*
 317                          * XXX one of these days, this needs to be moved into class Commands.
 318                          */
 319                         if (command == "UID")
 320                         {
 321                                 return this->ParseUID(prefix, params);
 322                         }
 323                         else if (command == "FJOIN")
 324                         {
 325                                 return this->ForceJoin(prefix,params);
 326                         }
 327                         else if ((command == "NOTICE" || command == "PRIVMSG") && (Utils->IsServer(prefix)))
 328                         {
 329                                 return this->ServerMessage(assign(command), prefix, params, sourceserv);
 330                         }
 331                         else if (command == "STATS")
 332                         {
 333                                 return this->Stats(prefix, params);
 334                         }
 335                         else if (command == "MOTD")
 336                         {
 337                                 return this->Motd(prefix, params);
 338                         }
 339                         else if (command == "KILL" && ServerSource)
 340                         {
 341                                 // Kill from a server
 342                                 return this->RemoteKill(prefix,params);
 343                         }
 344                         else if (command == "MODULES")
 345                         {
 346                                 return this->Modules(prefix, params);
 347                         }
 348                         else if (command == "ADMIN")
 349                         {
 350                                 return this->Admin(prefix, params);
 351                         }
 352                         else if (command == "MAP")
 353                         {
 354                                 User* user = ServerInstance->FindNick(prefix);
 355                                 if (user)
 356                                 {
 357                                         std::vector<std::string> p(params.begin(), params.end());
 358                                         return Utils->Creator->HandleMap(p, user);
 359                                 }
 360                         }
 361                         else if (command == "SERVER")
 362                         {
 363                                 return this->RemoteServer(prefix,params);
 364                         }
 365                         else if (command == "ERROR")
 366                         {
 367                                 return this->Error(params);
 368                         }
 369                         else if (command == "OPERTYPE")
 370                         {
 371                                 return this->OperType(prefix,params);
 372                         }
 373                         else if (command == "FMODE")
 374                         {
 375                                 return this->ForceMode(prefix,params);
 376                         }
 377                         else if (command == "FTOPIC")
 378                         {
 379                                 return this->ForceTopic(prefix,params);
 380                         }
 381                         else if (command == "METADATA")
 382                         {
 383                                 return this->MetaData(prefix,params);
 384                         }
 385                         else if (command == "PING")
 386                         {
 387                                 return this->LocalPing(prefix,params);
 388                         }
 389                         else if (command == "PONG")
 390                         {
 391                                 TreeServer *s = Utils->FindServer(prefix);
 392                                 if (s && s->bursting)
 393                                 {
 394                                         ServerInstance->SNO->WriteToSnoMask('l',"Server \002%s\002 has not finished burst, forcing end of burst (send ENDBURST!)", prefix.c_str());
 395                                         s->FinishBurst();
 396                                 }
 397                                 return this->LocalPong(prefix,params);
 398                         }
 399                         else if (command == "VERSION")
 400                         {
 401                                 return this->ServerVersion(prefix,params);
 402                         }
 403                         else if (command == "FHOST")
 404                         {
 405                                 return this->ChangeHost(prefix,params);
 406                         }
 407                         else if (command == "FNAME")
 408                         {
 409                                 return this->ChangeName(prefix,params);
 410                         }
 411                         else if (command == "ADDLINE")
 412                         {
 413                                 return this->AddLine(prefix,params);
 414                         }
 415                         else if (command == "DELLINE")
 416                         {
 417                                 return this->DelLine(prefix,params);
 418                         }
 419                         else if (command == "SVSNICK")
 420                         {
 421                                 return this->ForceNick(prefix,params);
 422                         }
 423                         else if (command == "OPERQUIT")
 424                         {
 425                                 return this->OperQuit(prefix,params);
 426                         }
 427                         else if (command == "IDLE")
 428                         {
 429                                 return this->Whois(prefix,params);
 430                         }
 431                         else if (command == "PUSH")
 432                         {
 433                                 return this->Push(prefix,params);
 434                         }
 435                         else if (command == "TIME")
 436                         {
 437                                 return this->Time(prefix,params);
 438                         }
 439                         else if (command == "SVSJOIN")
 440                         {
 441                                 return this->ServiceJoin(prefix,params);
 442                         }
 443                         else if (command == "SVSPART")
 444                         {
 445                                 return this->ServicePart(prefix,params);
 446                         }
 447                         else if (command == "SQUIT")
 448                         {
 449                                 if (params.size() == 2)
 450                                 {
 451                                         this->Squit(Utils->FindServer(params[0]),params[1]);
 452                                 }
 453                                 return true;
 454                         }
 455                         else if (command == "MODENOTICE")
 456                         {
 457                                 if (params.size() >= 2)
 458                                 {
 459                                         if (ServerSource)
 460                                                 ServerInstance->Users->WriteMode(params[0].c_str(), WM_AND, "*** From %s: %s", (ServerSource ? ServerSource->GetName().c_str() : prefix.c_str()), params[1].c_str());
 461                                 }
 462                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 463                         }
 464                         else if (command == "SNONOTICE")
 465                         {
 466                                 if (params.size() >= 2)
 467                                 {
 468                                         std::string oldprefix;
 469                                         if (!ServerSource)
 470                                         {
 471                                                 oldprefix = prefix;
 472                                                 User *u = ServerInstance->FindNick(prefix);
 473                                                 if (!u)
 474                                                         return true;
 475                                                 prefix = u->nick;
 476                                         }
 477
 478                                         ServerInstance->SNO->WriteToSnoMask(*(params[0].c_str()), "From " + (ServerSource ? ServerSource->GetName().c_str() : prefix) + ": "+ params[1]);
 479                                         prefix = oldprefix;
 480                                         return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 481                                 }
 482
 483                         }
 484                         else if (command == "BURST")
 485                         {
 486                                 // Set prefix server as bursting
 487                                 if (!ServerSource)
 488                                 {
 489                                         this->ServerInstance->SNO->WriteToSnoMask('l', "WTF: Got BURST from a nonexistant server(?): %s", (ServerSource ? ServerSource->GetName().c_str() : prefix.c_str()));
 490                                         return false;
 491                                 }
 492
 493                                 ServerSource->bursting = true;
 494                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 495                         }
 496                         else if (command == "ENDBURST")
 497                         {
 498                                 if (!ServerSource)
 499                                 {
 500                                         this->ServerInstance->SNO->WriteToSnoMask('l', "WTF: Got ENDBURST from a nonexistant server(?): %s", (ServerSource ? ServerSource->GetName().c_str() : prefix.c_str()));
 501                                         return false;
 502                                 }
 503
 504                                 ServerSource->FinishBurst();
 505                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
 506                         }
 507                         else if (command == "ENCAP")
 508                         {
 509                                 return this->Encap(prefix, params);
 510                         }
 511                         else
 512                         {
 513                                 /*
 514                                  * Not a special s2s command. Emulate the user doing it.
 515                                  * This saves us having a huge ugly command parser again.
 516                                  */
 517                                 User* who = this->ServerInstance->FindUUID(prefix);
 518
 519                                 if (ServerSource)
 520                                 {
 521                                         who = Utils->ServerUser;
 522                                 }
 523                                 else if (!who)
 524                                 {
 525                                         /* this looks ugly because command is an irc::string
 526                                          * It is important that we dont close the link here, unknown prefix can occur
 527                                          * due to various race conditions such as the KILL message for a user somehow
 528                                          * crossing the users QUIT further upstream from the server. Thanks jilles!
 529                                          */
 530                                         ServerInstance->Logs->Log("m_spanningtree", DEBUG, "Command " + std::string(command.c_str()) + " from unknown prefix " + prefix + "! Dropping entire command.");
 531                                         return true;
 532                                 }
 533
 534                                 if (command == "NICK")
 535                                 {
 536                                         if (params.size() != 2)
 537                                         {
 538                                                 SendError("Protocol violation: NICK message without TS - :"+std::string(who->uuid)+" NICK "+params[0]);
 539                                                 return false;
 540                                         }
 541                                         /* Update timestamp on user when they change nicks */
 542                                         who->age = atoi(params[1].c_str());
 543
 544                                         /*
 545                                          * On nick messages, check that the nick doesnt already exist here.
 546                                          * If it does, perform collision logic.
 547                                          */
 548                                         User* x = this->ServerInstance->FindNickOnly(params[0]);
 549                                         if ((x) && (x != who))
 550                                         {
 551                                                 int collideret = 0;
 552                                                 /* x is local, who is remote */
 553                                                 collideret = this->DoCollision(x, who->age, who->ident, who->GetIPString(), who->uuid);
 554                                                 if (collideret != 1)
 555                                                 {
 556                                                         /*
 557                                                          * Remote client lost, or both lost, parsing or passing on this
 558                                                          * nickchange would be pointless, as the incoming client's server will
 559                                                          * soon recieve SVSNICK to change its nick to its UID. :) -- w00t
 560                                                          */
 561                                                         return true;
 562                                                 }
 563                                         }
 564                                 }
 565
 566                                 // it's a user
 567                                 std::vector<std::string> strparams(params.begin(), params.end());
 568
 569                                 switch (this->ServerInstance->CallCommandHandler(command.c_str(), strparams, who))
 570                                 {
 571                                         case CMD_INVALID:
 572                                                 /*
 573                                                  * XXX: command is irc::string, hence ugliness
 574                                                  */
 575                                                 this->SendError("Unrecognised or malformed command '" + std::string(command.c_str()) + "' -- possibly loaded mismatched modules");
 576                                                 return false;
 577                                                 break;
 578                                         case CMD_FAILURE:
 579                                                 /*
 580                                                  * CMD_LOCALONLY is aliased to CMD_FAILURE, so this won't go out onto the network.
 581                                                  */
 582                                                 return true;
 583                                                 break;
 584                                         default:
 585                                                 /* CMD_SUCCESS falls through here */
 586                                                 break;
 587                                 }
 588
 589                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
 590
 591                         }
 592                         return true;
 593                         break; // end of state CONNECTED (phew).
 594         }
 595         return true;
 596 }
 597
 598 std::string TreeSocket::GetName()
 599 {
 600         std::string sourceserv = this->myhost;
 601         if (!this->InboundServerName.empty())
 602         {
 603                 sourceserv = this->InboundServerName;
 604         }
 605         return sourceserv;
 606 }
 607
 608 void TreeSocket::OnTimeout()
 609 {
 610         if (this->LinkState == CONNECTING)
 611         {
 612                 this->ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Connection to \002%s\002 timed out.", myhost.c_str());
 613                 Link* MyLink = Utils->FindLink(myhost);
 614                 if (MyLink)
 615                         Utils->DoFailOver(MyLink);
 616         }
 617 }
 618
 619 void TreeSocket::OnClose()
 620 {
 621         // Test fix for big fuckup
 622         if (this->LinkState != CONNECTED)
 623                 return;
 624
 625         // Connection closed.
 626         // If the connection is fully up (state CONNECTED)
 627         // then propogate a netsplit to all peers.
 628         std::string quitserver = this->myhost;
 629         if (!this->InboundServerName.empty())
 630         {
 631                 quitserver = this->InboundServerName;
 632         }
 633         TreeServer* s = Utils->FindServer(quitserver);
 634         if (s)
 635         {
 636                 Squit(s,"Remote host closed the connection");
 637         }
 638
 639         if (!quitserver.empty())
 640         {
 641                 this->ServerInstance->SNO->WriteToSnoMask('l', "Connection to '\2%s\2' failed.",quitserver.c_str());
 642
 643                 time_t server_uptime = ServerInstance->Time() - this->age;
 644                 if (server_uptime)
 645                                 this->ServerInstance->SNO->WriteToSnoMask('l', "Connection to '\2%s\2' was established for %s", quitserver.c_str(), Utils->Creator->TimeToStr(server_uptime).c_str());
 646         }
 647 }