src/core/coresessioneventprocessor.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2019 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
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   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
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  20
  21 #include "coresessioneventprocessor.h"
  22
  23 #include <algorithm>
  24
  25 #include "coreirclisthelper.h"
  26 #include "corenetwork.h"
  27 #include "coresession.h"
  28 #include "coretransfer.h"
  29 #include "coretransfermanager.h"
  30 #include "ctcpevent.h"
  31 #include "ircevent.h"
  32 #include "ircuser.h"
  33 #include "messageevent.h"
  34 #include "netsplit.h"
  35 #include "quassel.h"
  36
  37 #ifdef HAVE_QCA2
  38 #    include "keyevent.h"
  39 #endif
  40
  41 // IRCv3 capabilities
  42 #include "irccap.h"
  43
  44 CoreSessionEventProcessor::CoreSessionEventProcessor(CoreSession* session)
  45     : BasicHandler("handleCtcp", session)
  46     , _coreSession(session)
  47 {
  48     connect(coreSession(), &CoreSession::networkDisconnected, this, &CoreSessionEventProcessor::destroyNetsplits);
  49     connect(this, &CoreSessionEventProcessor::newEvent, coreSession()->eventManager(), &EventManager::postEvent);
  50 }
  51
  52 bool CoreSessionEventProcessor::checkParamCount(IrcEvent* e, int minParams)
  53 {
  54     if (e->params().count() < minParams) {
  55         if (e->type() == EventManager::IrcEventNumeric) {
  56             qWarning() << "Command " << static_cast<IrcEventNumeric*>(e)->number() << " requires " << minParams
  57                        << "params, got: " << e->params();
  58         }
  59         else {
  60             QString name = coreSession()->eventManager()->enumName(e->type());
  61             qWarning() << qPrintable(name) << "requires" << minParams << "params, got:" << e->params();
  62         }
  63         e->stop();
  64         return false;
  65     }
  66     return true;
  67 }
  68
  69 void CoreSessionEventProcessor::tryNextNick(NetworkEvent* e, const QString& errnick, bool erroneus)
  70 {
  71     QStringList desiredNicks = coreSession()->identity(e->network()->identity())->nicks();
  72     int nextNickIdx = desiredNicks.indexOf(errnick) + 1;
  73     QString nextNick;
  74     if (nextNickIdx > 0 && desiredNicks.size() > nextNickIdx) {
  75         nextNick = desiredNicks[nextNickIdx];
  76     }
  77     else {
  78         if (erroneus) {
  79             // FIXME Make this an ErrorEvent or something like that, so it's translated in the client
  80             MessageEvent* msgEvent = new MessageEvent(Message::Error,
  81                                                       e->network(),
  82                                                       tr("No free and valid nicks in nicklist found. use: /nick <othernick> to continue"),
  83                                                       QString(),
  84                                                       QString(),
  85                                                       Message::None,
  86                                                       e->timestamp());
  87             emit newEvent(msgEvent);
  88             return;
  89         }
  90         else {
  91             nextNick = errnick + "_";
  92         }
  93     }
  94     // FIXME Use a proper output event for this
  95     coreNetwork(e)->putRawLine("NICK " + coreNetwork(e)->encodeServerString(nextNick));
  96 }
  97
  98 void CoreSessionEventProcessor::processIrcEventNumeric(IrcEventNumeric* e)
  99 {
 100     switch (e->number()) {
 101     // SASL authentication replies
 102     // See: http://ircv3.net/specs/extensions/sasl-3.1.html
 103
 104     // case 900:  // RPL_LOGGEDIN
 105     // case 901:  // RPL_LOGGEDOUT
 106     // Don't use 900 or 901 for updating the local hostmask.  Unreal 3.2 gives it as the IP address
 107     // even when cloaked.
 108     // Every other reply should result in moving on
 109     // TODO Handle errors to stop connection if appropriate
 110     case 902:  // ERR_NICKLOCKED
 111     case 903:  // RPL_SASLSUCCESS
 112     case 904:  // ERR_SASLFAIL
 113     case 905:  // ERR_SASLTOOLONG
 114     case 906:  // ERR_SASLABORTED
 115     case 907:  // ERR_SASLALREADY
 116         // Move on to the next capability
 117         coreNetwork(e)->sendNextCap();
 118         break;
 119
 120     default:
 121         break;
 122     }
 123 }
 124
 125 void CoreSessionEventProcessor::processIrcEventAuthenticate(IrcEvent* e)
 126 {
 127     if (!checkParamCount(e, 1))
 128         return;
 129
 130     if (e->params().at(0) != "+") {
 131         qWarning() << "Invalid AUTHENTICATE" << e;
 132         return;
 133     }
 134
 135     CoreNetwork* net = coreNetwork(e);
 136
 137 #ifdef HAVE_SSL
 138     if (net->identityPtr()->sslCert().isNull()) {
 139 #endif
 140         QString construct = net->saslAccount();
 141         construct.append(QChar(QChar::Null));
 142         construct.append(net->saslAccount());
 143         construct.append(QChar(QChar::Null));
 144         construct.append(net->saslPassword());
 145         QByteArray saslData = QByteArray(construct.toLatin1().toBase64());
 146         saslData.prepend("AUTHENTICATE ");
 147         net->putRawLine(saslData);
 148 #ifdef HAVE_SSL
 149     }
 150     else {
 151         net->putRawLine("AUTHENTICATE +");
 152     }
 153 #endif
 154 }
 155
 156 void CoreSessionEventProcessor::processIrcEventCap(IrcEvent* e)
 157 {
 158     // Handle capability negotiation
 159     // See: http://ircv3.net/specs/core/capability-negotiation-3.2.html
 160     // And: http://ircv3.net/specs/core/capability-negotiation-3.1.html
 161
 162     // All commands require at least 2 parameters
 163     if (!checkParamCount(e, 2))
 164         return;
 165
 166     CoreNetwork* coreNet = coreNetwork(e);
 167     QString capCommand = e->params().at(1).trimmed().toUpper();
 168     if (capCommand == "LS" || capCommand == "NEW") {
 169         // Either we've gotten a list of capabilities, or new capabilities we may want
 170         // Server: CAP * LS * :multi-prefix extended-join account-notify batch invite-notify tls
 171         // Server: CAP * LS * :cap-notify server-time example.org/dummy-cap=dummyvalue example.org/second-dummy-cap
 172         // Server: CAP * LS :userhost-in-names sasl=EXTERNAL,DH-AES,DH-BLOWFISH,ECDSA-NIST256P-CHALLENGE,PLAIN
 173         bool capListFinished;
 174         QStringList availableCaps;
 175         if (e->params().count() == 4) {
 176             // Middle of multi-line reply, ignore the asterisk
 177             capListFinished = false;
 178             availableCaps = e->params().at(3).split(' ');
 179         }
 180         else {
 181             // Single line reply
 182             capListFinished = true;
 183             if (e->params().count() >= 3) {
 184                 // Some capabilities are specified, add them
 185                 availableCaps = e->params().at(2).split(' ');
 186             }
 187             else {
 188                 // No capabilities available, add an empty list
 189                 availableCaps = QStringList();
 190             }
 191         }
 192         // Sort capabilities before requesting for consistency among networks.  This may avoid
 193         // unexpected cases when some networks offer capabilities in a different order than
 194         // others.  It also looks nicer in logs.  Not required.
 195         availableCaps.sort();
 196         // Store what capabilities are available
 197         QString availableCapName, availableCapValue;
 198         for (int i = 0; i < availableCaps.count(); ++i) {
 199             // Capability may include values, e.g. CAP * LS :multi-prefix sasl=EXTERNAL
 200             // Capability name comes before the first '='.  If no '=' exists, this gets the
 201             // whole string instead.
 202             availableCapName = availableCaps[i].section('=', 0, 0).trimmed();
 203             // Some capabilities include multiple key=value pairs in the listing,
 204             // e.g. "sts=duration=31536000,port=6697"
 205             // Include everything after the first equal sign as part of the value.  If no '='
 206             // exists, this gets an empty string.
 207             availableCapValue = availableCaps[i].section('=', 1).trimmed();
 208             // Only add the capability if it's non-empty
 209             if (!availableCapName.isEmpty()) {
 210                 coreNet->addCap(availableCapName, availableCapValue);
 211             }
 212         }
 213
 214         // Begin capability requests when capability listing complete
 215         if (capListFinished)
 216             coreNet->beginCapNegotiation();
 217     }
 218     else if (capCommand == "ACK") {
 219         // CAP ACK requires at least 3 parameters (no empty response allowed)
 220         if (!checkParamCount(e, 3)) {
 221             // If an invalid reply is sent, try to continue rather than getting stuck.
 222             coreNet->sendNextCap();
 223             return;
 224         }
 225
 226         // Server: CAP * ACK :multi-prefix sasl
 227         // Got the capabilities we want, handle as needed.
 228         QStringList acceptedCaps;
 229         acceptedCaps = e->params().at(2).split(' ');
 230
 231         // Store what capability was acknowledged
 232         QString acceptedCap;
 233
 234         // Keep track of whether or not a capability requires further configuration.  Due to queuing
 235         // logic in CoreNetwork::queueCap(), this shouldn't ever happen when more than one
 236         // capability is requested, but it's better to handle edge cases or faulty servers.
 237         bool capsRequireConfiguration = false;
 238
 239         for (int i = 0; i < acceptedCaps.count(); ++i) {
 240             acceptedCap = acceptedCaps[i].trimmed().toLower();
 241             // Mark this cap as accepted
 242             coreNet->acknowledgeCap(acceptedCap);
 243             if (!capsRequireConfiguration && coreNet->capsRequiringConfiguration.contains(acceptedCap)) {
 244                 capsRequireConfiguration = true;
 245                 // Some capabilities (e.g. SASL) require further messages to finish.  If so, do NOT
 246                 // send the next capability; it will be handled elsewhere in CoreNetwork.
 247                 // Otherwise, allow moving on to the next capability.
 248             }
 249         }
 250
 251         if (!capsRequireConfiguration) {
 252             // No additional configuration required, move on to the next capability
 253             coreNet->sendNextCap();
 254         }
 255     }
 256     else if (capCommand == "NAK" || capCommand == "DEL") {
 257         // CAP NAK/DEL require at least 3 parameters (no empty response allowed)
 258         if (!checkParamCount(e, 3)) {
 259             if (capCommand == "NAK") {
 260                 // If an invalid reply is sent, try to continue rather than getting stuck.  This
 261                 // only matters for denied caps, not removed caps.
 262                 coreNet->sendNextCap();
 263             }
 264             return;
 265         }
 266
 267         // Either something went wrong with the capabilities, or they are no longer supported
 268         // > For CAP NAK
 269         // Server: CAP * NAK :multi-prefix sasl
 270         // > For CAP DEL
 271         // Server: :irc.example.com CAP modernclient DEL :multi-prefix sasl
 272         // CAP NAK and CAP DEL replies are always single-line
 273
 274         QStringList removedCaps;
 275         removedCaps = e->params().at(2).split(' ');
 276
 277         // Store the capabilities that were denied or removed
 278         QString removedCap;
 279         for (int i = 0; i < removedCaps.count(); ++i) {
 280             removedCap = removedCaps[i].trimmed().toLower();
 281             // Mark this cap as removed.
 282             // For CAP DEL, removes it from use.
 283             // For CAP NAK when received before negotiation enabled these capabilities, removeCap()
 284             // should do nothing.  This merely guards against non-spec servers sending an
 285             // unsolicited CAP ACK then later removing that capability.
 286             coreNet->removeCap(removedCap);
 287         }
 288
 289         if (capCommand == "NAK") {
 290             // Continue negotiation only if this is the result of denied caps, not removed caps
 291             if (removedCaps.count() > 1) {
 292                 // We've received a CAP NAK reply to multiple capabilities at once.  Unfortunately,
 293                 // we don't know which capability failed and which ones are valid to re-request, so
 294                 // individually retry each capability from the failed bundle.
 295                 // See CoreNetwork::retryCapsIndividually() for more details.
 296                 coreNet->retryCapsIndividually();
 297                 // Still need to call sendNextCap() to carry on.
 298             }
 299             // Carry on with negotiation
 300             coreNet->sendNextCap();
 301         }
 302     }
 303 }
 304
 305 /* IRCv3 account-notify
 306  * Log in:  ":nick!user@host ACCOUNT accountname"
 307  * Log out: ":nick!user@host ACCOUNT *" */
 308 void CoreSessionEventProcessor::processIrcEventAccount(IrcEvent* e)
 309 {
 310     if (!checkParamCount(e, 1))
 311         return;
 312
 313     IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 314     if (ircuser) {
 315         // WHOX uses '0' to indicate logged-out, account-notify and extended-join uses '*'.
 316         // As '*' is used internally to represent logged-out, no need to handle that differently.
 317         ircuser->setAccount(e->params().at(0));
 318     }
 319     else {
 320         qDebug() << "Received account-notify data for unknown user" << e->prefix();
 321     }
 322 }
 323
 324 /* IRCv3 away-notify - ":nick!user@host AWAY [:message]" */
 325 void CoreSessionEventProcessor::processIrcEventAway(IrcEvent* e)
 326 {
 327     if (!checkParamCount(e, 1))
 328         return;
 329     // Don't use checkParamCount(e, 2) since the message is optional.  Some servers respond in a way
 330     // that it counts as two parameters, but we shouldn't rely on that.
 331
 332     // Nick is sent as part of parameters in order to split user/server decoding
 333     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 334     if (ircuser) {
 335         // If two parameters are sent -and- the second parameter isn't empty, then user is away.
 336         // Otherwise, mark them as not away.
 337         if (e->params().count() >= 2 && !e->params().at(1).isEmpty()) {
 338             ircuser->setAway(true);
 339             ircuser->setAwayMessage(e->params().at(1));
 340         }
 341         else {
 342             ircuser->setAway(false);
 343         }
 344     }
 345     else {
 346         qDebug() << "Received away-notify data for unknown user" << e->params().at(0);
 347     }
 348 }
 349
 350 /* IRCv3 chghost - ":nick!user@host CHGHOST newuser new.host.goes.here" */
 351 void CoreSessionEventProcessor::processIrcEventChghost(IrcEvent* e)
 352 {
 353     if (!checkParamCount(e, 2))
 354         return;
 355
 356     IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 357     if (ircuser) {
 358         // Update with new user/hostname information.  setUser/setHost handles checking what
 359         // actually changed.
 360         ircuser->setUser(e->params().at(0));
 361         ircuser->setHost(e->params().at(1));
 362     }
 363     else {
 364         qDebug() << "Received chghost data for unknown user" << e->prefix();
 365     }
 366 }
 367
 368 void CoreSessionEventProcessor::processIrcEventInvite(IrcEvent* e)
 369 {
 370     if (checkParamCount(e, 2)) {
 371         e->network()->updateNickFromMask(e->prefix());
 372     }
 373 }
 374
 375 /*  JOIN: ":<nick!user@host> JOIN <channel>" */
 376 void CoreSessionEventProcessor::processIrcEventJoin(IrcEvent* e)
 377 {
 378     if (e->testFlag(EventManager::Fake))  // generated by handleEarlyNetsplitJoin
 379         return;
 380
 381     if (!checkParamCount(e, 1))
 382         return;
 383
 384     CoreNetwork* net = coreNetwork(e);
 385     QString channel = e->params()[0];
 386     IrcUser* ircuser = net->updateNickFromMask(e->prefix());
 387
 388     if (net->capEnabled(IrcCap::EXTENDED_JOIN)) {
 389         if (e->params().count() < 3) {
 390             // Some IRC servers don't send extended-join events in all situations.  Rather than
 391             // ignore the join entirely, treat it as a regular join with a debug-level log entry.
 392             // See:  https://github.com/inspircd/inspircd/issues/821
 393             qDebug() << "extended-join requires 3 params, got:" << e->params()
 394                      << ", handling as a "
 395                         "regular join";
 396         }
 397         else {
 398             // If logged in, :nick!user@host JOIN #channelname accountname :Real Name
 399             // If logged out, :nick!user@host JOIN #channelname * :Real Name
 400             // See:  http://ircv3.net/specs/extensions/extended-join-3.1.html
 401             // WHOX uses '0' to indicate logged-out, account-notify and extended-join uses '*'.
 402             // As '*' is used internally to represent logged-out, no need to handle that differently.
 403             ircuser->setAccount(e->params()[1]);
 404             // Update the user's real name, too
 405             ircuser->setRealName(e->params()[2]);
 406         }
 407     }
 408     // Else :nick!user@host JOIN #channelname
 409
 410     bool handledByNetsplit = false;
 411     for (Netsplit* n : _netsplits.value(e->network())) {
 412         handledByNetsplit = n->userJoined(e->prefix(), channel);
 413         if (handledByNetsplit)
 414             break;
 415     }
 416
 417     // With "away-notify" enabled, some IRC servers forget to send :away messages for users who join
 418     // channels while away.  Unfortunately, working around this involves WHO'ng every single user as
 419     // they join, which is not very efficient.  If at all possible, it's better to get the issue
 420     // fixed in the IRC server instead.
 421     //
 422     // If pursuing a workaround instead, this is where you'd do it.  Check the version control
 423     // history for the commit that added this comment to see how to implement it - there's some
 424     // unexpected situations to watch out for!
 425     //
 426     // See https://ircv3.net/specs/extensions/away-notify-3.1.html
 427
 428     if (!handledByNetsplit)
 429         ircuser->joinChannel(channel);
 430     else
 431         e->setFlag(EventManager::Netsplit);
 432
 433     if (net->isMe(ircuser)) {
 434         net->setChannelJoined(channel);
 435         // Mark the message as Self
 436         e->setFlag(EventManager::Self);
 437         // FIXME use event
 438         net->putRawLine(net->serverEncode("MODE " + channel));  // we want to know the modes of the channel we just joined, so we ask politely
 439     }
 440 }
 441
 442 void CoreSessionEventProcessor::lateProcessIrcEventKick(IrcEvent* e)
 443 {
 444     if (checkParamCount(e, 2)) {
 445         e->network()->updateNickFromMask(e->prefix());
 446         IrcUser* victim = e->network()->ircUser(e->params().at(1));
 447         if (victim) {
 448             victim->partChannel(e->params().at(0));
 449             // if(e->network()->isMe(victim)) e->network()->setKickedFromChannel(channel);
 450         }
 451     }
 452 }
 453
 454 void CoreSessionEventProcessor::processIrcEventMode(IrcEvent* e)
 455 {
 456     if (!checkParamCount(e, 2))
 457         return;
 458
 459     if (e->network()->isChannelName(e->params().first())) {
 460         // Channel Modes
 461
 462         IrcChannel* channel = e->network()->ircChannel(e->params()[0]);
 463         if (!channel) {
 464             // we received mode information for a channel we're not in. that means probably we've just been kicked out or something like
 465             // that anyways: we don't have a place to store the data --> discard the info.
 466             return;
 467         }
 468
 469         QString modes = e->params()[1];
 470         bool add = true;
 471         int paramOffset = 2;
 472         for (auto mode : modes) {
 473             if (mode == '+') {
 474                 add = true;
 475                 continue;
 476             }
 477             if (mode == '-') {
 478                 add = false;
 479                 continue;
 480             }
 481
 482             if (e->network()->prefixModes().contains(mode)) {
 483                 // user channel modes (op, voice, etc...)
 484                 if (paramOffset < e->params().count()) {
 485                     IrcUser* ircUser = e->network()->ircUser(e->params()[paramOffset]);
 486                     if (!ircUser) {
 487                         qWarning() << Q_FUNC_INFO << "Unknown IrcUser:" << e->params()[paramOffset];
 488                     }
 489                     else {
 490                         if (add) {
 491                             bool handledByNetsplit = false;
 492                             QHash<QString, Netsplit*> splits = _netsplits.value(e->network());
 493                             for (Netsplit* n : _netsplits.value(e->network())) {
 494                                 handledByNetsplit = n->userAlreadyJoined(ircUser->hostmask(), channel->name());
 495                                 if (handledByNetsplit) {
 496                                     n->addMode(ircUser->hostmask(), channel->name(), QString(mode));
 497                                     break;
 498                                 }
 499                             }
 500                             if (!handledByNetsplit)
 501                                 channel->addUserMode(ircUser, QString(mode));
 502                         }
 503                         else
 504                             channel->removeUserMode(ircUser, QString(mode));
 505                     }
 506                 }
 507                 else {
 508                     qWarning() << "Received MODE with too few parameters:" << e->params();
 509                 }
 510                 ++paramOffset;
 511             }
 512             else {
 513                 // regular channel modes
 514                 QString value;
 515                 Network::ChannelModeType modeType = e->network()->channelModeType(mode);
 516                 if (modeType == Network::A_CHANMODE || modeType == Network::B_CHANMODE || (modeType == Network::C_CHANMODE && add)) {
 517                     if (paramOffset < e->params().count()) {
 518                         value = e->params()[paramOffset];
 519                     }
 520                     else {
 521                         qWarning() << "Received MODE with too few parameters:" << e->params();
 522                     }
 523                     ++paramOffset;
 524                 }
 525
 526                 if (add)
 527                     channel->addChannelMode(mode, value);
 528                 else
 529                     channel->removeChannelMode(mode, value);
 530             }
 531         }
 532     }
 533     else {
 534         // pure User Modes
 535         IrcUser* ircUser = e->network()->newIrcUser(e->params().first());
 536         QString modeString(e->params()[1]);
 537         QString addModes;
 538         QString removeModes;
 539         bool add = false;
 540         for (int c = 0; c < modeString.count(); c++) {
 541             if (modeString[c] == '+') {
 542                 add = true;
 543                 continue;
 544             }
 545             if (modeString[c] == '-') {
 546                 add = false;
 547                 continue;
 548             }
 549             if (add)
 550                 addModes += modeString[c];
 551             else
 552                 removeModes += modeString[c];
 553         }
 554         if (!addModes.isEmpty())
 555             ircUser->addUserModes(addModes);
 556         if (!removeModes.isEmpty())
 557             ircUser->removeUserModes(removeModes);
 558
 559         if (e->network()->isMe(ircUser)) {
 560             // Mark the message as Self
 561             e->setFlag(EventManager::Self);
 562             coreNetwork(e)->updatePersistentModes(addModes, removeModes);
 563         }
 564     }
 565 }
 566
 567 void CoreSessionEventProcessor::processIrcEventNick(IrcEvent* e)
 568 {
 569     if (checkParamCount(e, 1)) {
 570         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 571         if (!ircuser) {
 572             qWarning() << Q_FUNC_INFO << "Unknown IrcUser!";
 573             return;
 574         }
 575
 576         if (e->network()->isMe(ircuser)) {
 577             // Mark the message as Self
 578             e->setFlag(EventManager::Self);
 579         }
 580
 581         // Actual processing is handled in lateProcessIrcEventNick(), this just sets the event flag
 582     }
 583 }
 584
 585 void CoreSessionEventProcessor::lateProcessIrcEventNick(IrcEvent* e)
 586 {
 587     if (checkParamCount(e, 1)) {
 588         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 589         if (!ircuser) {
 590             qWarning() << Q_FUNC_INFO << "Unknown IrcUser!";
 591             return;
 592         }
 593         QString newnick = e->params().at(0);
 594         QString oldnick = ircuser->nick();
 595
 596         // the order is cruicial
 597         // otherwise the client would rename the buffer, see that the assigned ircuser doesn't match anymore
 598         // and remove the ircuser from the querybuffer leading to a wrong on/offline state
 599         ircuser->setNick(newnick);
 600         coreSession()->renameBuffer(e->networkId(), newnick, oldnick);
 601     }
 602 }
 603
 604 void CoreSessionEventProcessor::processIrcEventPart(IrcEvent* e)
 605 {
 606     if (checkParamCount(e, 1)) {
 607         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 608         if (!ircuser) {
 609             qWarning() << Q_FUNC_INFO << "Unknown IrcUser!";
 610             return;
 611         }
 612
 613         if (e->network()->isMe(ircuser)) {
 614             // Mark the message as Self
 615             e->setFlag(EventManager::Self);
 616         }
 617
 618         // Actual processing is handled in lateProcessIrcEventNick(), this just sets the event flag
 619     }
 620 }
 621
 622 void CoreSessionEventProcessor::lateProcessIrcEventPart(IrcEvent* e)
 623 {
 624     if (checkParamCount(e, 1)) {
 625         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 626         if (!ircuser) {
 627             qWarning() << Q_FUNC_INFO << "Unknown IrcUser!";
 628             return;
 629         }
 630         QString channel = e->params().at(0);
 631         ircuser->partChannel(channel);
 632         if (e->network()->isMe(ircuser)) {
 633             qobject_cast<CoreNetwork*>(e->network())->setChannelParted(channel);
 634         }
 635     }
 636 }
 637
 638 void CoreSessionEventProcessor::processIrcEventPing(IrcEvent* e)
 639 {
 640     QString param = e->params().count() ? e->params().first() : QString();
 641     // FIXME use events
 642     // Take priority so this won't get stuck behind other queued messages.
 643     coreNetwork(e)->putRawLine("PONG " + coreNetwork(e)->serverEncode(param), true);
 644 }
 645
 646 void CoreSessionEventProcessor::processIrcEventPong(IrcEvent* e)
 647 {
 648     // Ensure we get at least one parameter
 649     if (!checkParamCount(e, 1))
 650         return;
 651
 652     // Some IRC servers respond with only one parameter, others respond with two, with the latter
 653     // being the text sent.  Handle both situations.
 654     QString timestamp;
 655     if (e->params().count() < 2) {
 656         // Only one parameter received
 657         // :localhost PONG 02:43:49.565
 658         timestamp = e->params().at(0);
 659     }
 660     else {
 661         // Two parameters received, pick the second
 662         // :localhost PONG localhost :02:43:49.565
 663         timestamp = e->params().at(1);
 664     }
 665
 666     // The server is supposed to send back what we passed as parameter, and we send a timestamp.
 667     // However, using quote and whatnot, one can send arbitrary pings, and IRC servers may decide to
 668     // ignore our requests entirely and send whatever they want, so we have to do some sanity
 669     // checks.
 670     //
 671     // Attempt to parse the timestamp
 672     QTime sendTime = QTime::fromString(timestamp, "hh:mm:ss.zzz");
 673     if (sendTime.isValid()) {
 674         // Mark IRC server as sending valid ping replies
 675         if (!coreNetwork(e)->isPongTimestampValid()) {
 676             coreNetwork(e)->setPongTimestampValid(true);
 677             // Add a message the first time it happens
 678             qDebug().nospace() << "Received PONG with valid timestamp, marking pong replies on "
 679                                   "network "
 680                                << "\"" << qPrintable(e->network()->networkName())
 681                                << "\" (ID: " << qPrintable(QString::number(e->network()->networkId().toInt()))
 682                                << ") as usable for latency measurement";
 683         }
 684         // Remove pending flag
 685         coreNetwork(e)->resetPongReplyPending();
 686
 687         // Don't show this in the UI
 688         e->setFlag(EventManager::Silent);
 689         // TODO:  To allow for a user-sent /ping (without arguments, so default timestamp is used),
 690         // this could track how many automated PINGs have been sent by the core and subtract one
 691         // each time, only marking the PING as silent if there's pending automated pong replies.
 692         // However, that's a behavior change which warrants further testing.  For now, take the
 693         // simpler, previous approach that errs on the side of silencing too much.
 694
 695         // Calculate latency from time difference, divided by 2 to account for round-trip time
 696         e->network()->setLatency(sendTime.msecsTo(QTime::currentTime()) / 2);
 697     }
 698     else if (coreNetwork(e)->isPongReplyPending() && !coreNetwork(e)->isPongTimestampValid()) {
 699         // There's an auto-PING reply pending and we've not yet received a PONG reply with a valid
 700         // timestamp.  It's possible this server will never respond with a valid timestamp, and thus
 701         // any automated PINGs will result in unwanted spamming of the server buffer.
 702
 703         // Don't show this in the UI
 704         e->setFlag(EventManager::Silent);
 705         // Remove pending flag
 706         coreNetwork(e)->resetPongReplyPending();
 707
 708         // Log a message
 709         qDebug().nospace() << "Received PONG with invalid timestamp from network "
 710                            << "\"" << qPrintable(e->network()->networkName())
 711                            << "\" (ID: " << qPrintable(QString::number(e->network()->networkId().toInt()))
 712                            << "), silencing, parameters are " << e->params();
 713     }
 714     // else: We're not expecting a PONG reply and timestamp is not valid, assume it's from the user
 715 }
 716
 717 void CoreSessionEventProcessor::processIrcEventQuit(IrcEvent* e)
 718 {
 719     IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 720     if (!ircuser)
 721         return;
 722
 723     if (e->network()->isMe(ircuser)) {
 724         // Mark the message as Self
 725         e->setFlag(EventManager::Self);
 726     }
 727
 728     QString msg;
 729     if (e->params().count() > 0)
 730         msg = e->params()[0];
 731
 732     // check if netsplit
 733     if (Netsplit::isNetsplit(msg)) {
 734         Netsplit* n;
 735         if (!_netsplits[e->network()].contains(msg)) {
 736             n = new Netsplit(e->network(), this);
 737             connect(n, &Netsplit::finished, this, &CoreSessionEventProcessor::handleNetsplitFinished);
 738             connect(n, &Netsplit::netsplitJoin, this, &CoreSessionEventProcessor::handleNetsplitJoin);
 739             connect(n, &Netsplit::netsplitQuit, this, &CoreSessionEventProcessor::handleNetsplitQuit);
 740             connect(n, &Netsplit::earlyJoin, this, &CoreSessionEventProcessor::handleEarlyNetsplitJoin);
 741             _netsplits[e->network()].insert(msg, n);
 742         }
 743         else {
 744             n = _netsplits[e->network()][msg];
 745         }
 746         // add this user to the netsplit
 747         n->userQuit(e->prefix(), ircuser->channels(), msg);
 748         e->setFlag(EventManager::Netsplit);
 749     }
 750     // normal quit is handled in lateProcessIrcEventQuit()
 751 }
 752
 753 void CoreSessionEventProcessor::lateProcessIrcEventQuit(IrcEvent* e)
 754 {
 755     if (e->testFlag(EventManager::Netsplit))
 756         return;
 757
 758     IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 759     if (!ircuser)
 760         return;
 761
 762     ircuser->quit();
 763 }
 764
 765 void CoreSessionEventProcessor::processIrcEventTopic(IrcEvent* e)
 766 {
 767     if (checkParamCount(e, 2)) {
 768         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 769
 770         if (e->network()->isMe(ircuser)) {
 771             // Mark the message as Self
 772             e->setFlag(EventManager::Self);
 773         }
 774
 775         IrcChannel* channel = e->network()->ircChannel(e->params().at(0));
 776         if (channel)
 777             channel->setTopic(e->params().at(1));
 778     }
 779 }
 780
 781 /* ERROR - "ERROR :reason"
 782 Example:  ERROR :Closing Link: nickname[xxx.xxx.xxx.xxx] (Large base64 image paste.)
 783 See https://tools.ietf.org/html/rfc2812#section-3.7.4 */
 784 void CoreSessionEventProcessor::processIrcEventError(IrcEvent* e)
 785 {
 786     if (!checkParamCount(e, 1))
 787         return;
 788
 789     if (coreNetwork(e)->disconnectExpected()) {
 790         // During QUIT, the server should send an error (often, but not always, "Closing Link"). As
 791         // we're expecting it, don't show this to the user.
 792         e->setFlag(EventManager::Silent);
 793     }
 794 }
 795
 796 #ifdef HAVE_QCA2
 797 void CoreSessionEventProcessor::processKeyEvent(KeyEvent* e)
 798 {
 799     if (!Cipher::neededFeaturesAvailable()) {
 800         emit newEvent(new MessageEvent(Message::Error,
 801                                        e->network(),
 802                                        tr("Unable to perform key exchange, missing qca-ossl plugin."),
 803                                        e->prefix(),
 804                                        e->target(),
 805                                        Message::None,
 806                                        e->timestamp()));
 807         return;
 808     }
 809     auto* net = qobject_cast<CoreNetwork*>(e->network());
 810     Cipher* c = net->cipher(e->target());
 811     if (!c)  // happens when there is no CoreIrcChannel for the target (i.e. never?)
 812         return;
 813
 814     if (e->exchangeType() == KeyEvent::Init) {
 815         QByteArray pubKey = c->parseInitKeyX(e->key());
 816         if (pubKey.isEmpty()) {
 817             emit newEvent(new MessageEvent(Message::Error,
 818                                            e->network(),
 819                                            tr("Unable to parse the DH1080_INIT. Key exchange failed."),
 820                                            e->prefix(),
 821                                            e->target(),
 822                                            Message::None,
 823                                            e->timestamp()));
 824             return;
 825         }
 826         else {
 827             net->setCipherKey(e->target(), c->key());
 828             emit newEvent(new MessageEvent(Message::Info,
 829                                            e->network(),
 830                                            tr("Your key is set and messages will be encrypted."),
 831                                            e->prefix(),
 832                                            e->target(),
 833                                            Message::None,
 834                                            e->timestamp()));
 835             QList<QByteArray> p;
 836             p << net->serverEncode(e->target()) << net->serverEncode("DH1080_FINISH ") + pubKey;
 837             net->putCmd("NOTICE", p);
 838         }
 839     }
 840     else {
 841         if (c->parseFinishKeyX(e->key())) {
 842             net->setCipherKey(e->target(), c->key());
 843             emit newEvent(new MessageEvent(Message::Info,
 844                                            e->network(),
 845                                            tr("Your key is set and messages will be encrypted."),
 846                                            e->prefix(),
 847                                            e->target(),
 848                                            Message::None,
 849                                            e->timestamp()));
 850         }
 851         else {
 852             emit newEvent(new MessageEvent(Message::Info,
 853                                            e->network(),
 854                                            tr("Failed to parse DH1080_FINISH. Key exchange failed."),
 855                                            e->prefix(),
 856                                            e->target(),
 857                                            Message::None,
 858                                            e->timestamp()));
 859         }
 860     }
 861 }
 862 #endif
 863
 864 /* RPL_WELCOME */
 865 void CoreSessionEventProcessor::processIrcEvent001(IrcEventNumeric* e)
 866 {
 867     e->network()->setCurrentServer(e->prefix());
 868     e->network()->setMyNick(e->target());
 869 }
 870
 871 /* RPL_ISUPPORT */
 872 // TODO Complete 005 handling, also use sensible defaults for non-sent stuff
 873 void CoreSessionEventProcessor::processIrcEvent005(IrcEvent* e)
 874 {
 875     if (!checkParamCount(e, 1))
 876         return;
 877
 878     QString key, value;
 879     for (int i = 0; i < e->params().count() - 1; i++) {
 880         QString key = e->params()[i].section("=", 0, 0);
 881         QString value = e->params()[i].section("=", 1);
 882         e->network()->addSupport(key, value);
 883     }
 884
 885     /* determine our prefixes here to get an accurate result */
 886     e->network()->determinePrefixes();
 887 }
 888
 889 /* RPL_UMODEIS - "<user_modes> [<user_mode_params>]" */
 890 void CoreSessionEventProcessor::processIrcEvent221(IrcEvent*)
 891 {
 892     // TODO: save information in network object
 893 }
 894
 895 /* RPL_STATSCONN - "Highest connection cout: 8000 (7999 clients)" */
 896 void CoreSessionEventProcessor::processIrcEvent250(IrcEvent*)
 897 {
 898     // TODO: save information in network object
 899 }
 900
 901 /* RPL_LOCALUSERS - "Current local user: 5024  Max: 7999 */
 902 void CoreSessionEventProcessor::processIrcEvent265(IrcEvent*)
 903 {
 904     // TODO: save information in network object
 905 }
 906
 907 /* RPL_GLOBALUSERS - "Current global users: 46093  Max: 47650" */
 908 void CoreSessionEventProcessor::processIrcEvent266(IrcEvent*)
 909 {
 910     // TODO: save information in network object
 911 }
 912
 913 /*
 914 WHOIS-Message:
 915    Replies 311 - 313, 317 - 319 are all replies generated in response to a WHOIS message.
 916   and 301 (RPL_AWAY)
 917               "<nick> :<away message>"
 918 WHO-Message:
 919    Replies 352 and 315 paired are used to answer a WHO message.
 920
 921 WHOWAS-Message:
 922    Replies 314 and 369 are responses to a WHOWAS message.
 923
 924 */
 925
 926 /* RPL_AWAY - "<nick> :<away message>" */
 927 void CoreSessionEventProcessor::processIrcEvent301(IrcEvent* e)
 928 {
 929     if (!checkParamCount(e, 2))
 930         return;
 931
 932     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 933     if (ircuser) {
 934         ircuser->setAway(true);
 935         ircuser->setAwayMessage(e->params().at(1));
 936         // lastAwayMessageTime is set in EventStringifier::processIrcEvent301(), no need to set it
 937         // here too
 938         // ircuser->setLastAwayMessageTime(now);
 939     }
 940 }
 941
 942 /* RPL_UNAWAY - ":You are no longer marked as being away" */
 943 void CoreSessionEventProcessor::processIrcEvent305(IrcEvent* e)
 944 {
 945     IrcUser* me = e->network()->me();
 946     if (me)
 947         me->setAway(false);
 948
 949     if (e->network()->autoAwayActive()) {
 950         e->network()->setAutoAwayActive(false);
 951         e->setFlag(EventManager::Silent);
 952     }
 953 }
 954
 955 /* RPL_NOWAWAY - ":You have been marked as being away" */
 956 void CoreSessionEventProcessor::processIrcEvent306(IrcEvent* e)
 957 {
 958     IrcUser* me = e->network()->me();
 959     if (me)
 960         me->setAway(true);
 961 }
 962
 963 /* RPL_WHOISSERVICE - "<user> is registered nick" */
 964 void CoreSessionEventProcessor::processIrcEvent307(IrcEvent* e)
 965 {
 966     if (!checkParamCount(e, 1))
 967         return;
 968
 969     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 970     if (ircuser)
 971         ircuser->setWhoisServiceReply(e->params().join(" "));
 972 }
 973
 974 /* RPL_SUSERHOST - "<user> is available for help." */
 975 void CoreSessionEventProcessor::processIrcEvent310(IrcEvent* e)
 976 {
 977     if (!checkParamCount(e, 1))
 978         return;
 979
 980     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 981     if (ircuser)
 982         ircuser->setSuserHost(e->params().join(" "));
 983 }
 984
 985 /*  RPL_WHOISUSER - "<nick> <user> <host> * :<real name>" */
 986 void CoreSessionEventProcessor::processIrcEvent311(IrcEvent* e)
 987 {
 988     if (!checkParamCount(e, 3))
 989         return;
 990
 991     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 992     if (ircuser) {
 993         ircuser->setUser(e->params().at(1));
 994         ircuser->setHost(e->params().at(2));
 995         ircuser->setRealName(e->params().last());
 996     }
 997 }
 998
 999 /*  RPL_WHOISSERVER -  "<nick> <server> :<server info>" */
1000 void CoreSessionEventProcessor::processIrcEvent312(IrcEvent* e)
1001 {
1002     if (!checkParamCount(e, 2))
1003         return;
1004
1005     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1006     if (ircuser)
1007         ircuser->setServer(e->params().at(1));
1008 }
1009
1010 /*  RPL_WHOISOPERATOR - "<nick> :is an IRC operator" */
1011 void CoreSessionEventProcessor::processIrcEvent313(IrcEvent* e)
1012 {
1013     if (!checkParamCount(e, 1))
1014         return;
1015
1016     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1017     if (ircuser)
1018         ircuser->setIrcOperator(e->params().last());
1019 }
1020
1021 /*  RPL_ENDOFWHO: "<name> :End of WHO list" */
1022 void CoreSessionEventProcessor::processIrcEvent315(IrcEvent* e)
1023 {
1024     if (!checkParamCount(e, 1))
1025         return;
1026
1027     if (coreNetwork(e)->setAutoWhoDone(e->params()[0]))
1028         e->setFlag(EventManager::Silent);
1029 }
1030
1031 /*  RPL_WHOISIDLE - "<nick> <integer> :seconds idle"
1032    (real life: "<nick> <integer> <integer> :seconds idle, signon time) */
1033 void CoreSessionEventProcessor::processIrcEvent317(IrcEvent* e)
1034 {
1035     if (!checkParamCount(e, 2))
1036         return;
1037
1038     QDateTime loginTime;
1039
1040     int idleSecs = e->params()[1].toInt();
1041     if (e->params().count() > 3) {  // if we have more then 3 params we have the above mentioned "real life" situation
1042         // Allow for 64-bit time
1043         qint64 logintime = e->params()[2].toLongLong();
1044         // Time in IRC protocol is defined as seconds.  Convert from seconds instead.
1045         // See https://doc.qt.io/qt-5/qdatetime.html#fromSecsSinceEpoch
1046 #if QT_VERSION >= 0x050800
1047         loginTime = QDateTime::fromSecsSinceEpoch(logintime);
1048 #else
1049         // fromSecsSinceEpoch() was added in Qt 5.8.  Manually downconvert to seconds for
1050         // now.
1051         // See https://doc.qt.io/qt-5/qdatetime.html#fromMSecsSinceEpoch
1052         loginTime = QDateTime::fromMSecsSinceEpoch((qint64)(logintime * 1000));
1053 #endif
1054     }
1055
1056     IrcUser* ircuser = e->network()->ircUser(e->params()[0]);
1057     if (ircuser) {
1058         ircuser->setIdleTime(e->timestamp().addSecs(-idleSecs));
1059         if (loginTime.isValid())
1060             ircuser->setLoginTime(loginTime);
1061     }
1062 }
1063
1064 /* RPL_LIST -  "<channel> <# visible> :<topic>" */
1065 void CoreSessionEventProcessor::processIrcEvent322(IrcEvent* e)
1066 {
1067     if (!checkParamCount(e, 1))
1068         return;
1069
1070     QString channelName;
1071     quint32 userCount = 0;
1072     QString topic;
1073
1074     switch (e->params().count()) {
1075     case 3:
1076         topic = e->params()[2];
1077         // fallthrough
1078     case 2:
1079         userCount = e->params()[1].toUInt();
1080         // fallthrough
1081     case 1:
1082         channelName = e->params()[0];
1083         // fallthrough
1084     default:
1085         break;
1086     }
1087     if (coreSession()->ircListHelper()->addChannel(e->networkId(), channelName, userCount, topic))
1088         e->stop();  // consumed by IrcListHelper, so don't further process/show this event
1089 }
1090
1091 /* RPL_LISTEND ":End of LIST" */
1092 void CoreSessionEventProcessor::processIrcEvent323(IrcEvent* e)
1093 {
1094     if (!checkParamCount(e, 1))
1095         return;
1096
1097     if (coreSession()->ircListHelper()->endOfChannelList(e->networkId()))
1098         e->stop();  // consumed by IrcListHelper, so don't further process/show this event
1099 }
1100
1101 /* RPL_CHANNELMODEIS - "<channel> <mode> <mode params>" */
1102 void CoreSessionEventProcessor::processIrcEvent324(IrcEvent* e)
1103 {
1104     processIrcEventMode(e);
1105 }
1106
1107 /*  RPL_WHOISACCOUNT - "<nick> <account> :is authed as" */
1108 void CoreSessionEventProcessor::processIrcEvent330(IrcEvent* e)
1109 {
1110     // Though the ":is authed as" remark should always be there, we should handle cases when it's
1111     // not included, too.
1112     if (!checkParamCount(e, 2))
1113         return;
1114
1115     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1116     if (ircuser) {
1117         ircuser->setAccount(e->params().at(1));
1118     }
1119 }
1120
1121 /* RPL_NOTOPIC */
1122 void CoreSessionEventProcessor::processIrcEvent331(IrcEvent* e)
1123 {
1124     if (!checkParamCount(e, 1))
1125         return;
1126
1127     IrcChannel* chan = e->network()->ircChannel(e->params()[0]);
1128     if (chan)
1129         chan->setTopic(QString());
1130 }
1131
1132 /* RPL_TOPIC */
1133 void CoreSessionEventProcessor::processIrcEvent332(IrcEvent* e)
1134 {
1135     if (!checkParamCount(e, 2))
1136         return;
1137
1138     IrcChannel* chan = e->network()->ircChannel(e->params()[0]);
1139     if (chan)
1140         chan->setTopic(e->params()[1]);
1141 }
1142
1143 /*  RPL_WHOREPLY: "<channel> <user> <host> <server> <nick>
1144               ( "H" / "G" > ["*"] [ ( "@" / "+" ) ] :<hopcount> <real name>" */
1145 void CoreSessionEventProcessor::processIrcEvent352(IrcEvent* e)
1146 {
1147     if (!checkParamCount(e, 6))
1148         return;
1149
1150     QString channel = e->params()[0];
1151     IrcUser* ircuser = e->network()->ircUser(e->params()[4]);
1152     if (ircuser) {
1153         // Only process the WHO information if an IRC user exists.  Don't create an IRC user here;
1154         // there's no way to track when the user quits, which would leave a phantom IrcUser lying
1155         // around.
1156         // NOTE:  Whenever MONITOR support is introduced, the IrcUser will be created by an
1157         // RPL_MONONLINE numeric before any WHO commands are run.
1158         processWhoInformation(e->network(),
1159                               channel,
1160                               ircuser,
1161                               e->params()[3],
1162                               e->params()[1],
1163                               e->params()[2],
1164                               e->params()[5],
1165                               e->params().last().section(" ", 1));
1166     }
1167
1168     // Check if channel name has a who in progress.
1169     if (coreNetwork(e)->isAutoWhoInProgress(channel)) {
1170         e->setFlag(EventManager::Silent);
1171     }
1172 }
1173
1174 /* RPL_NAMREPLY */
1175 void CoreSessionEventProcessor::processIrcEvent353(IrcEvent* e)
1176 {
1177     if (!checkParamCount(e, 3))
1178         return;
1179
1180     // param[0] is either "=", "*" or "@" indicating a public, private or secret channel
1181     // we don't use this information at the time beeing
1182     QString channelname = e->params()[1];
1183
1184     IrcChannel* channel = e->network()->ircChannel(channelname);
1185     if (!channel) {
1186         qWarning() << Q_FUNC_INFO << "Received unknown target channel:" << channelname;
1187         return;
1188     }
1189
1190     QStringList nicks;
1191     QStringList modes;
1192
1193     // Cache result of multi-prefix to avoid unneeded casts and lookups with each iteration.
1194     bool _useCapMultiPrefix = coreNetwork(e)->capEnabled(IrcCap::MULTI_PREFIX);
1195
1196     for (QString nick : e->params()[2].split(' ', QString::SkipEmptyParts)) {
1197         QString mode;
1198
1199         if (_useCapMultiPrefix) {
1200             // If multi-prefix is enabled, all modes will be sent in NAMES replies.
1201             // :hades.arpa 353 guest = #tethys :~&@%+aji &@Attila @+alyx +KindOne Argure
1202             // See: http://ircv3.net/specs/extensions/multi-prefix-3.1.html
1203             while (e->network()->prefixes().contains(nick[0])) {
1204                 // Mode found in 1 left-most character, add it to the list.
1205                 // Note: sending multiple modes may cause a warning in older clients.
1206                 // In testing, the clients still seemed to function fine.
1207                 mode.append(e->network()->prefixToMode(nick[0]));
1208                 // Remove this mode from the nick
1209                 nick = nick.remove(0, 1);
1210             }
1211         }
1212         else if (e->network()->prefixes().contains(nick[0])) {
1213             // Multi-prefix is disabled and a mode prefix was found.
1214             mode = e->network()->prefixToMode(nick[0]);
1215             nick = nick.mid(1);
1216         }
1217
1218         // If userhost-in-names capability is enabled, the following will be
1219         // in the form "nick!user@host" rather than "nick".  This works without
1220         // special handling as the following use nickFromHost() as needed.
1221         // See: http://ircv3.net/specs/extensions/userhost-in-names-3.2.html
1222
1223         nicks << nick;
1224         modes << mode;
1225     }
1226
1227     channel->joinIrcUsers(nicks, modes);
1228 }
1229
1230 /*  RPL_WHOSPCRPL: "<yournick> 152 #<channel> ~<ident> <host> <servname> <nick>
1231                     ("H"/ "G") <account> :<realname>"
1232 <channel> is * if not specific to any channel
1233 <account> is * if not logged in
1234 Follows HexChat's usage of 'whox'
1235 See https://github.com/hexchat/hexchat/blob/c874a9525c9b66f1d5ddcf6c4107d046eba7e2c5/src/common/proto-irc.c#L750
1236 And http://faerion.sourceforge.net/doc/irc/whox.var*/
1237 void CoreSessionEventProcessor::processIrcEvent354(IrcEvent* e)
1238 {
1239     // First only check if at least one parameter exists.  Otherwise, it'll stop the result from
1240     // being shown if the user chooses different parameters.
1241     if (!checkParamCount(e, 1))
1242         return;
1243
1244     if (e->params()[0].toUInt() != IrcCap::ACCOUNT_NOTIFY_WHOX_NUM) {
1245         // Ignore WHOX replies without expected number for we have no idea what fields are specified
1246         return;
1247     }
1248
1249     // Now we're fairly certain this is supposed to be an automated WHOX.  Bail out if it doesn't
1250     // match what we require - 9 parameters.
1251     if (!checkParamCount(e, 9))
1252         return;
1253
1254     QString channel = e->params()[1];
1255     IrcUser* ircuser = e->network()->ircUser(e->params()[5]);
1256     if (ircuser) {
1257         // Only process the WHO information if an IRC user exists.  Don't create an IRC user here;
1258         // there's no way to track when the user quits, which would leave a phantom IrcUser lying
1259         // around.
1260         // NOTE:  Whenever MONITOR support is introduced, the IrcUser will be created by an
1261         // RPL_MONONLINE numeric before any WHO commands are run.
1262         processWhoInformation(e->network(), channel, ircuser, e->params()[4], e->params()[2], e->params()[3], e->params()[6], e->params().last());
1263         // Don't use .section(" ", 1) with WHOX replies, for there's no hopcount to trim out
1264
1265         // As part of IRCv3 account-notify, check account name
1266         // WHOX uses '0' to indicate logged-out, account-notify and extended-join uses '*'.
1267         QString newAccount = e->params()[7];
1268         if (newAccount != "0") {
1269             // Account logged in, set account name
1270             ircuser->setAccount(newAccount);
1271         }
1272         else {
1273             // Account logged out, set account name to logged-out
1274             ircuser->setAccount("*");
1275         }
1276     }
1277
1278     // Check if channel name has a who in progress.
1279     if (coreNetwork(e)->isAutoWhoInProgress(channel)) {
1280         e->setFlag(EventManager::Silent);
1281     }
1282 }
1283
1284 void CoreSessionEventProcessor::processWhoInformation(Network* net,
1285                                                       const QString& targetChannel,
1286                                                       IrcUser* ircUser,
1287                                                       const QString& server,
1288                                                       const QString& user,
1289                                                       const QString& host,
1290                                                       const QString& awayStateAndModes,
1291                                                       const QString& realname)
1292 {
1293     ircUser->setUser(user);
1294     ircUser->setHost(host);
1295     ircUser->setServer(server);
1296     ircUser->setRealName(realname);
1297
1298     bool away = awayStateAndModes.contains("G", Qt::CaseInsensitive);
1299     ircUser->setAway(away);
1300
1301     if (net->capEnabled(IrcCap::MULTI_PREFIX)) {
1302         // If multi-prefix is enabled, all modes will be sent in WHO replies.
1303         // :kenny.chatspike.net 352 guest #test grawity broken.symlink *.chatspike.net grawity H@%+ :0 Mantas M.
1304         // See: http://ircv3.net/specs/extensions/multi-prefix-3.1.html
1305         QString uncheckedModes = awayStateAndModes;
1306         QString validModes = QString();
1307         while (!uncheckedModes.isEmpty()) {
1308             // Mode found in 1 left-most character, add it to the list
1309             if (net->prefixes().contains(uncheckedModes[0])) {
1310                 validModes.append(net->prefixToMode(uncheckedModes[0]));
1311             }
1312             // Remove this mode from the list of unchecked modes
1313             uncheckedModes = uncheckedModes.remove(0, 1);
1314         }
1315
1316         // Some IRC servers decide to not follow the spec, returning only -some- of the user
1317         // modes in WHO despite listing them all in NAMES.  For now, assume it can only add
1318         // and not take away.  *sigh*
1319         if (!validModes.isEmpty()) {
1320             if (targetChannel != "*") {
1321                 // Channel-specific modes received, apply to given channel only
1322                 IrcChannel* ircChan = net->ircChannel(targetChannel);
1323                 if (ircChan) {
1324                     // Do one mode at a time
1325                     // TODO Better way of syncing this without breaking protocol?
1326                     for (int i = 0; i < validModes.count(); ++i) {
1327                         ircChan->addUserMode(ircUser, validModes.at(i));
1328                     }
1329                 }
1330             }
1331             else {
1332                 // Modes apply to the user everywhere
1333                 ircUser->addUserModes(validModes);
1334             }
1335         }
1336     }
1337 }
1338
1339 /* ERR_NOSUCHCHANNEL - "<channel name> :No such channel" */
1340 void CoreSessionEventProcessor::processIrcEvent403(IrcEventNumeric* e)
1341 {
1342     // If this is the result of an AutoWho, hide it.  It's confusing to show to the user.
1343     // Though the ":No such channel" remark should always be there, we should handle cases when it's
1344     // not included, too.
1345     if (!checkParamCount(e, 1))
1346         return;
1347
1348     QString channelOrNick = e->params()[0];
1349     // Check if channel name has a who in progress.
1350     // If not, then check if user nick exists and has a who in progress.
1351     if (coreNetwork(e)->isAutoWhoInProgress(channelOrNick)) {
1352         qDebug() << "Channel/nick" << channelOrNick << "no longer exists during AutoWho, ignoring";
1353         e->setFlag(EventManager::Silent);
1354     }
1355 }
1356
1357 /* ERR_ERRONEUSNICKNAME */
1358 void CoreSessionEventProcessor::processIrcEvent432(IrcEventNumeric* e)
1359 {
1360     if (!checkParamCount(e, 1))
1361         return;
1362
1363     QString errnick;
1364     if (e->params().count() < 2) {
1365         // handle unreal-ircd bug, where unreal ircd doesnt supply a TARGET in ERR_ERRONEUSNICKNAME during registration phase:
1366         // nick @@@
1367         // :irc.scortum.moep.net 432  @@@ :Erroneous Nickname: Illegal characters
1368         // correct server reply:
1369         // :irc.scortum.moep.net 432 * @@@ :Erroneous Nickname: Illegal characters
1370         e->params().prepend(e->target());
1371         e->setTarget("*");
1372     }
1373     errnick = e->params()[0];
1374
1375     tryNextNick(e, errnick, true /* erroneus */);
1376 }
1377
1378 /* ERR_NICKNAMEINUSE */
1379 void CoreSessionEventProcessor::processIrcEvent433(IrcEventNumeric* e)
1380 {
1381     if (!checkParamCount(e, 1))
1382         return;
1383
1384     QString errnick = e->params().first();
1385
1386     // if there is a problem while connecting to the server -> we handle it
1387     // but only if our connection has not been finished yet...
1388     if (!e->network()->currentServer().isEmpty())
1389         return;
1390
1391     tryNextNick(e, errnick);
1392 }
1393
1394 /* ERR_UNAVAILRESOURCE */
1395 void CoreSessionEventProcessor::processIrcEvent437(IrcEventNumeric* e)
1396 {
1397     if (!checkParamCount(e, 1))
1398         return;
1399
1400     QString errnick = e->params().first();
1401
1402     // if there is a problem while connecting to the server -> we handle it
1403     // but only if our connection has not been finished yet...
1404     if (!e->network()->currentServer().isEmpty())
1405         return;
1406
1407     if (!e->network()->isChannelName(errnick))
1408         tryNextNick(e, errnick);
1409 }
1410
1411 /* template
1412 void CoreSessionEventProcessor::processIrcEvent(IrcEvent *e) {
1413   if(!checkParamCount(e, 1))
1414     return;
1415
1416 }
1417 */
1418
1419 /* Handle signals from Netsplit objects  */
1420
1421 void CoreSessionEventProcessor::handleNetsplitJoin(
1422     Network* net, const QString& channel, const QStringList& users, const QStringList& modes, const QString& quitMessage)
1423 {
1424     IrcChannel* ircChannel = net->ircChannel(channel);
1425     if (!ircChannel) {
1426         return;
1427     }
1428     QList<IrcUser*> ircUsers;
1429     QStringList newModes = modes;
1430     QStringList newUsers = users;
1431
1432     for (const QString& user : users) {
1433         IrcUser* iu = net->ircUser(nickFromMask(user));
1434         if (iu)
1435             ircUsers.append(iu);
1436         else {  // the user already quit
1437             int idx = users.indexOf(user);
1438             newUsers.removeAt(idx);
1439             newModes.removeAt(idx);
1440         }
1441     }
1442
1443     ircChannel->joinIrcUsers(ircUsers, newModes);
1444     NetworkSplitEvent* event = new NetworkSplitEvent(EventManager::NetworkSplitJoin, net, channel, newUsers, quitMessage);
1445     emit newEvent(event);
1446 }
1447
1448 void CoreSessionEventProcessor::handleNetsplitQuit(Network* net, const QString& channel, const QStringList& users, const QString& quitMessage)
1449 {
1450     NetworkSplitEvent* event = new NetworkSplitEvent(EventManager::NetworkSplitQuit, net, channel, users, quitMessage);
1451     emit newEvent(event);
1452     for (const QString& user : users) {
1453         IrcUser* ircUser = net->ircUser(nickFromMask(user));
1454         if (ircUser) ircUser->quit();
1455     }
1456 }
1457
1458 void CoreSessionEventProcessor::handleEarlyNetsplitJoin(Network* net, const QString& channel, const QStringList& users, const QStringList& modes)
1459 {
1460     IrcChannel* ircChannel = net->ircChannel(channel);
1461     if (!ircChannel) {
1462         qDebug() << "handleEarlyNetsplitJoin(): channel " << channel << " invalid";
1463         return;
1464     }
1465     QList<NetworkEvent*> events;
1466     QList<IrcUser*> ircUsers;
1467     QStringList newModes = modes;
1468
1469     for (const QString& user : users) {
1470         IrcUser* ircUser = net->updateNickFromMask(user);
1471         if (ircUser) {
1472             ircUsers.append(ircUser);
1473             // fake event for scripts that consume join events
1474             events << new IrcEvent(EventManager::IrcEventJoin, net, {}, ircUser->hostmask(), QStringList() << channel);
1475         }
1476         else {
1477             newModes.removeAt(users.indexOf(user));
1478         }
1479     }
1480     ircChannel->joinIrcUsers(ircUsers, newModes);
1481     for (NetworkEvent* event : events) {
1482         event->setFlag(EventManager::Fake);  // ignore this in here!
1483         emit newEvent(event);
1484     }
1485 }
1486
1487 void CoreSessionEventProcessor::handleNetsplitFinished()
1488 {
1489     auto* n = qobject_cast<Netsplit*>(sender());
1490     Q_ASSERT(n);
1491     QHash<QString, Netsplit*> splithash = _netsplits.take(n->network());
1492     splithash.remove(splithash.key(n));
1493     if (splithash.count())
1494         _netsplits[n->network()] = splithash;
1495     n->deleteLater();
1496 }
1497
1498 void CoreSessionEventProcessor::destroyNetsplits(NetworkId netId)
1499 {
1500     Network* net = coreSession()->network(netId);
1501     if (!net)
1502         return;
1503
1504     QHash<QString, Netsplit*> splits = _netsplits.take(net);
1505     qDeleteAll(splits);
1506 }
1507
1508 /*******************************/
1509 /******** CTCP HANDLING ********/
1510 /*******************************/
1511
1512 void CoreSessionEventProcessor::processCtcpEvent(CtcpEvent* e)
1513 {
1514     if (e->testFlag(EventManager::Self))
1515         return;  // ignore ctcp events generated by user input
1516
1517     if (e->type() != EventManager::CtcpEvent || e->ctcpType() != CtcpEvent::Query)
1518         return;
1519
1520     handle(e->ctcpCmd(), Q_ARG(CtcpEvent*, e));
1521 }
1522
1523 void CoreSessionEventProcessor::defaultHandler(const QString& ctcpCmd, CtcpEvent* e)
1524 {
1525     // This handler is only there to avoid warnings for unknown CTCPs
1526     Q_UNUSED(e);
1527     Q_UNUSED(ctcpCmd);
1528 }
1529
1530 void CoreSessionEventProcessor::handleCtcpAction(CtcpEvent* e)
1531 {
1532     // This handler is only there to feed CLIENTINFO
1533     Q_UNUSED(e);
1534 }
1535
1536 void CoreSessionEventProcessor::handleCtcpClientinfo(CtcpEvent* e)
1537 {
1538     QStringList supportedHandlers;
1539     for (const QString& handler : providesHandlers())
1540         supportedHandlers << handler.toUpper();
1541     std::sort(supportedHandlers.begin(), supportedHandlers.end());
1542     e->setReply(supportedHandlers.join(" "));
1543 }
1544
1545 // http://www.irchelp.org/irchelp/rfc/ctcpspec.html
1546 // http://en.wikipedia.org/wiki/Direct_Client-to-Client
1547 void CoreSessionEventProcessor::handleCtcpDcc(CtcpEvent* e)
1548 {
1549     // DCC support is unfinished, experimental and potentially dangerous, so make it opt-in
1550     if (!Quassel::isOptionSet("enable-experimental-dcc")) {
1551         qInfo() << "DCC disabled, start core with --enable-experimental-dcc if you really want to try it out";
1552         return;
1553     }
1554
1555     // normal:  SEND <filename> <ip> <port> [<filesize>]
1556     // reverse: SEND <filename> <ip> 0 <filesize> <token>
1557     QStringList params = e->param().split(' ');
1558     if (params.count()) {
1559         QString cmd = params[0].toUpper();
1560         if (cmd == "SEND") {
1561             if (params.count() < 4) {
1562                 qWarning() << "Invalid DCC SEND request:" << e;  // TODO emit proper error to client
1563                 return;
1564             }
1565             QString filename = params[1];
1566             QHostAddress address;
1567             quint16 port = params[3].toUShort();
1568             quint64 size = 0;
1569             QString numIp = params[2];  // this is either IPv4 as a 32 bit value, or IPv6 (which always contains a colon)
1570             if (numIp.contains(':')) {  // IPv6
1571                 if (!address.setAddress(numIp)) {
1572                     qWarning() << "Invalid IPv6:" << numIp;
1573                     return;
1574                 }
1575             }
1576             else {
1577                 address.setAddress(numIp.toUInt());
1578             }
1579
1580             if (port == 0) {  // Reverse DCC is indicated by a 0 port
1581                 emit newEvent(new MessageEvent(Message::Error,
1582                                                e->network(),
1583                                                tr("Reverse DCC SEND not supported"),
1584                                                e->prefix(),
1585                                                e->target(),
1586                                                Message::None,
1587                                                e->timestamp()));
1588                 return;
1589             }
1590             if (port < 1024) {
1591                 qWarning() << "Privileged port requested:" << port;  // FIXME ask user if this is ok
1592             }
1593
1594             if (params.count() > 4) {  // filesize is optional
1595                 size = params[4].toULong();
1596             }
1597
1598             // TODO: check if target is the right thing to use for the partner
1599             CoreTransfer* transfer = new CoreTransfer(Transfer::Direction::Receive, e->target(), filename, address, port, size, this);
1600             coreSession()->signalProxy()->synchronize(transfer);
1601             coreSession()->transferManager()->addTransfer(transfer);
1602         }
1603         else {
1604             emit newEvent(new MessageEvent(Message::Error,
1605                                            e->network(),
1606                                            tr("DCC %1 not supported").arg(cmd),
1607                                            e->prefix(),
1608                                            e->target(),
1609                                            Message::None,
1610                                            e->timestamp()));
1611             return;
1612         }
1613     }
1614 }
1615
1616 void CoreSessionEventProcessor::handleCtcpPing(CtcpEvent* e)
1617 {
1618     e->setReply(e->param().isNull() ? "" : e->param());
1619 }
1620
1621 void CoreSessionEventProcessor::handleCtcpTime(CtcpEvent* e)
1622 {
1623     // Use the ISO standard to avoid locale-specific translated names
1624     // Include timezone offset data to show which timezone a user's in, otherwise we're providing
1625     // NTP-over-IRC with terrible accuracy.
1626     e->setReply(formatDateTimeToOffsetISO(QDateTime::currentDateTime()));
1627 }
1628
1629 void CoreSessionEventProcessor::handleCtcpVersion(CtcpEvent* e)
1630 {
1631     // Deliberately do not translate project name
1632     // Use the ISO standard to avoid locale-specific translated names
1633     // Use UTC time to provide a consistent string regardless of timezone
1634     // (Statistics tracking tools usually only group client versions by exact string matching)
1635     e->setReply(QString("Quassel IRC %1 (version date %2) -- https://www.quassel-irc.org")
1636                     .arg(Quassel::buildInfo().plainVersionString)
1637                     .arg(Quassel::buildInfo().commitDate.isEmpty()
1638                              ? "unknown"
1639                              : tryFormatUnixEpoch(Quassel::buildInfo().commitDate, Qt::DateFormat::ISODate, true)));
1640 }