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