src/core/coresessioneventprocessor.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2020 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
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   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
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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     if (net->identityPtr()->sslCert().isNull()) {
 138         QString construct = net->saslAccount();
 139         construct.append(QChar(QChar::Null));
 140         construct.append(net->saslAccount());
 141         construct.append(QChar(QChar::Null));
 142         construct.append(net->saslPassword());
 143         QByteArray saslData = QByteArray(construct.toLatin1().toBase64());
 144         saslData.prepend("AUTHENTICATE ");
 145         net->putRawLine(saslData);
 146     }
 147     else {
 148         net->putRawLine("AUTHENTICATE +");
 149     }
 150 }
 151
 152 void CoreSessionEventProcessor::processIrcEventCap(IrcEvent* e)
 153 {
 154     // Handle capability negotiation
 155     // See: http://ircv3.net/specs/core/capability-negotiation-3.2.html
 156     // And: http://ircv3.net/specs/core/capability-negotiation-3.1.html
 157
 158     // All commands require at least 2 parameters
 159     if (!checkParamCount(e, 2))
 160         return;
 161
 162     CoreNetwork* coreNet = coreNetwork(e);
 163     QString capCommand = e->params().at(1).trimmed().toUpper();
 164     if (capCommand == "LS" || capCommand == "NEW") {
 165         // Either we've gotten a list of capabilities, or new capabilities we may want
 166         // Server: CAP * LS * :multi-prefix extended-join account-notify batch invite-notify tls
 167         // Server: CAP * LS * :cap-notify server-time example.org/dummy-cap=dummyvalue example.org/second-dummy-cap
 168         // Server: CAP * LS :userhost-in-names sasl=EXTERNAL,DH-AES,DH-BLOWFISH,ECDSA-NIST256P-CHALLENGE,PLAIN
 169         bool capListFinished;
 170         QStringList availableCaps;
 171         if (e->params().count() == 4) {
 172             // Middle of multi-line reply, ignore the asterisk
 173             capListFinished = false;
 174             availableCaps = e->params().at(3).split(' ');
 175         }
 176         else {
 177             // Single line reply
 178             capListFinished = true;
 179             if (e->params().count() >= 3) {
 180                 // Some capabilities are specified, add them
 181                 availableCaps = e->params().at(2).split(' ');
 182             }
 183             else {
 184                 // No capabilities available, add an empty list
 185                 availableCaps = QStringList();
 186             }
 187         }
 188         // Sort capabilities before requesting for consistency among networks.  This may avoid
 189         // unexpected cases when some networks offer capabilities in a different order than
 190         // others.  It also looks nicer in logs.  Not required.
 191         availableCaps.sort();
 192         // Store what capabilities are available
 193         QString availableCapName, availableCapValue;
 194         for (int i = 0; i < availableCaps.count(); ++i) {
 195             // Capability may include values, e.g. CAP * LS :multi-prefix sasl=EXTERNAL
 196             // Capability name comes before the first '='.  If no '=' exists, this gets the
 197             // whole string instead.
 198             availableCapName = availableCaps[i].section('=', 0, 0).trimmed();
 199             // Some capabilities include multiple key=value pairs in the listing,
 200             // e.g. "sts=duration=31536000,port=6697"
 201             // Include everything after the first equal sign as part of the value.  If no '='
 202             // exists, this gets an empty string.
 203             availableCapValue = availableCaps[i].section('=', 1).trimmed();
 204             // Only add the capability if it's non-empty
 205             if (!availableCapName.isEmpty()) {
 206                 coreNet->addCap(availableCapName, availableCapValue);
 207             }
 208         }
 209
 210         // Begin capability requests when capability listing complete
 211         if (capListFinished)
 212             coreNet->beginCapNegotiation();
 213     }
 214     else if (capCommand == "ACK") {
 215         // CAP ACK requires at least 3 parameters (no empty response allowed)
 216         if (!checkParamCount(e, 3)) {
 217             // If an invalid reply is sent, try to continue rather than getting stuck.
 218             coreNet->sendNextCap();
 219             return;
 220         }
 221
 222         // Server: CAP * ACK :multi-prefix sasl
 223         // Got the capabilities we want, handle as needed.
 224         QStringList acceptedCaps;
 225         acceptedCaps = e->params().at(2).split(' ');
 226
 227         // Store what capability was acknowledged
 228         QString acceptedCap;
 229
 230         // Keep track of whether or not a capability requires further configuration.  Due to queuing
 231         // logic in CoreNetwork::queueCap(), this shouldn't ever happen when more than one
 232         // capability is requested, but it's better to handle edge cases or faulty servers.
 233         bool capsRequireConfiguration = false;
 234
 235         for (int i = 0; i < acceptedCaps.count(); ++i) {
 236             acceptedCap = acceptedCaps[i].trimmed().toLower();
 237             // Mark this cap as accepted
 238             coreNet->acknowledgeCap(acceptedCap);
 239             if (!capsRequireConfiguration && coreNet->capsRequiringConfiguration.contains(acceptedCap)) {
 240                 capsRequireConfiguration = true;
 241                 // Some capabilities (e.g. SASL) require further messages to finish.  If so, do NOT
 242                 // send the next capability; it will be handled elsewhere in CoreNetwork.
 243                 // Otherwise, allow moving on to the next capability.
 244             }
 245         }
 246
 247         if (!capsRequireConfiguration) {
 248             // No additional configuration required, move on to the next capability
 249             coreNet->sendNextCap();
 250         }
 251     }
 252     else if (capCommand == "NAK" || capCommand == "DEL") {
 253         // CAP NAK/DEL require at least 3 parameters (no empty response allowed)
 254         if (!checkParamCount(e, 3)) {
 255             if (capCommand == "NAK") {
 256                 // If an invalid reply is sent, try to continue rather than getting stuck.  This
 257                 // only matters for denied caps, not removed caps.
 258                 coreNet->sendNextCap();
 259             }
 260             return;
 261         }
 262
 263         // Either something went wrong with the capabilities, or they are no longer supported
 264         // > For CAP NAK
 265         // Server: CAP * NAK :multi-prefix sasl
 266         // > For CAP DEL
 267         // Server: :irc.example.com CAP modernclient DEL :multi-prefix sasl
 268         // CAP NAK and CAP DEL replies are always single-line
 269
 270         QStringList removedCaps;
 271         removedCaps = e->params().at(2).split(' ');
 272
 273         // Store the capabilities that were denied or removed
 274         QString removedCap;
 275         for (int i = 0; i < removedCaps.count(); ++i) {
 276             removedCap = removedCaps[i].trimmed().toLower();
 277             // Mark this cap as removed.
 278             // For CAP DEL, removes it from use.
 279             // For CAP NAK when received before negotiation enabled these capabilities, removeCap()
 280             // should do nothing.  This merely guards against non-spec servers sending an
 281             // unsolicited CAP ACK then later removing that capability.
 282             coreNet->removeCap(removedCap);
 283         }
 284
 285         if (capCommand == "NAK") {
 286             // Continue negotiation only if this is the result of denied caps, not removed caps
 287             if (removedCaps.count() > 1) {
 288                 // We've received a CAP NAK reply to multiple capabilities at once.  Unfortunately,
 289                 // we don't know which capability failed and which ones are valid to re-request, so
 290                 // individually retry each capability from the failed bundle.
 291                 // See CoreNetwork::retryCapsIndividually() for more details.
 292                 coreNet->retryCapsIndividually();
 293                 // Still need to call sendNextCap() to carry on.
 294             }
 295             // Carry on with negotiation
 296             coreNet->sendNextCap();
 297         }
 298     }
 299 }
 300
 301 /* IRCv3 account-notify
 302  * Log in:  ":nick!user@host ACCOUNT accountname"
 303  * Log out: ":nick!user@host ACCOUNT *" */
 304 void CoreSessionEventProcessor::processIrcEventAccount(IrcEvent* e)
 305 {
 306     if (!checkParamCount(e, 1))
 307         return;
 308
 309     IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 310     if (ircuser) {
 311         // WHOX uses '0' to indicate logged-out, account-notify and extended-join uses '*'.
 312         // As '*' is used internally to represent logged-out, no need to handle that differently.
 313         ircuser->setAccount(e->params().at(0));
 314     }
 315     else {
 316         qDebug() << "Received account-notify data for unknown user" << e->prefix();
 317     }
 318 }
 319
 320 /* IRCv3 away-notify - ":nick!user@host AWAY [:message]" */
 321 void CoreSessionEventProcessor::processIrcEventAway(IrcEvent* e)
 322 {
 323     if (!checkParamCount(e, 1))
 324         return;
 325     // Don't use checkParamCount(e, 2) since the message is optional.  Some servers respond in a way
 326     // that it counts as two parameters, but we shouldn't rely on that.
 327
 328     // Nick is sent as part of parameters in order to split user/server decoding
 329     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 330     if (ircuser) {
 331         // If two parameters are sent -and- the second parameter isn't empty, then user is away.
 332         // Otherwise, mark them as not away.
 333         if (e->params().count() >= 2 && !e->params().at(1).isEmpty()) {
 334             ircuser->setAway(true);
 335             ircuser->setAwayMessage(e->params().at(1));
 336         }
 337         else {
 338             ircuser->setAway(false);
 339         }
 340     }
 341     else {
 342         qDebug() << "Received away-notify data for unknown user" << e->params().at(0);
 343     }
 344 }
 345
 346 /* IRCv3 chghost - ":nick!user@host CHGHOST newuser new.host.goes.here" */
 347 void CoreSessionEventProcessor::processIrcEventChghost(IrcEvent* e)
 348 {
 349     if (!checkParamCount(e, 2))
 350         return;
 351
 352     IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 353     if (ircuser) {
 354         // Update with new user/hostname information.  setUser/setHost handles checking what
 355         // actually changed.
 356         ircuser->setUser(e->params().at(0));
 357         ircuser->setHost(e->params().at(1));
 358     }
 359     else {
 360         qDebug() << "Received chghost data for unknown user" << e->prefix();
 361     }
 362 }
 363
 364 // IRCv3 INVITE - ":<inviter> INVITE <target> <channel>"
 365 // Example:  :ChanServ!ChanServ@example.com INVITE Attila #channel
 366 //
 367 // See https://ircv3.net/specs/extensions/invite-notify-3.2
 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
 797 // IRCv3 SETNAME - ":nick!user@host SETNAME :realname goes here"
 798 // Example:  :batman!~batman@bat.cave SETNAME :Bruce Wayne <bruce@wayne.enterprises>
 799 //
 800 // See https://ircv3.net/specs/extensions/setname
 801 void CoreSessionEventProcessor::processIrcEventSetname(IrcEvent* e)
 802 {
 803     if (checkParamCount(e, 1)) {
 804         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 805         if (!ircuser) {
 806             qWarning() << Q_FUNC_INFO << "Unknown IrcUser!";
 807             return;
 808         }
 809
 810         QString newname = e->params().at(0);
 811         ircuser->setRealName(newname);
 812     }
 813 }
 814
 815 #ifdef HAVE_QCA2
 816 void CoreSessionEventProcessor::processKeyEvent(KeyEvent* e)
 817 {
 818     if (!Cipher::neededFeaturesAvailable()) {
 819         emit newEvent(new MessageEvent(Message::Error,
 820                                        e->network(),
 821                                        tr("Unable to perform key exchange, missing qca-ossl plugin."),
 822                                        e->prefix(),
 823                                        e->target(),
 824                                        Message::None,
 825                                        e->timestamp()));
 826         return;
 827     }
 828     auto* net = qobject_cast<CoreNetwork*>(e->network());
 829     Cipher* c = net->cipher(e->target());
 830     if (!c)  // happens when there is no CoreIrcChannel for the target (i.e. never?)
 831         return;
 832
 833     if (e->exchangeType() == KeyEvent::Init) {
 834         QByteArray pubKey = c->parseInitKeyX(e->key());
 835         if (pubKey.isEmpty()) {
 836             emit newEvent(new MessageEvent(Message::Error,
 837                                            e->network(),
 838                                            tr("Unable to parse the DH1080_INIT. Key exchange failed."),
 839                                            e->prefix(),
 840                                            e->target(),
 841                                            Message::None,
 842                                            e->timestamp()));
 843             return;
 844         }
 845         else {
 846             net->setCipherKey(e->target(), c->key());
 847             emit newEvent(new MessageEvent(Message::Info,
 848                                            e->network(),
 849                                            tr("Your key is set and messages will be encrypted."),
 850                                            e->prefix(),
 851                                            e->target(),
 852                                            Message::None,
 853                                            e->timestamp()));
 854             QList<QByteArray> p;
 855             p << net->serverEncode(e->target()) << net->serverEncode("DH1080_FINISH ") + pubKey;
 856             net->putCmd("NOTICE", p);
 857         }
 858     }
 859     else {
 860         if (c->parseFinishKeyX(e->key())) {
 861             net->setCipherKey(e->target(), c->key());
 862             emit newEvent(new MessageEvent(Message::Info,
 863                                            e->network(),
 864                                            tr("Your key is set and messages will be encrypted."),
 865                                            e->prefix(),
 866                                            e->target(),
 867                                            Message::None,
 868                                            e->timestamp()));
 869         }
 870         else {
 871             emit newEvent(new MessageEvent(Message::Info,
 872                                            e->network(),
 873                                            tr("Failed to parse DH1080_FINISH. Key exchange failed."),
 874                                            e->prefix(),
 875                                            e->target(),
 876                                            Message::None,
 877                                            e->timestamp()));
 878         }
 879     }
 880 }
 881 #endif
 882
 883 /* RPL_WELCOME */
 884 void CoreSessionEventProcessor::processIrcEvent001(IrcEventNumeric* e)
 885 {
 886     e->network()->setCurrentServer(e->prefix());
 887     e->network()->setMyNick(e->target());
 888 }
 889
 890 /* RPL_ISUPPORT */
 891 // TODO Complete 005 handling, also use sensible defaults for non-sent stuff
 892 void CoreSessionEventProcessor::processIrcEvent005(IrcEvent* e)
 893 {
 894     if (!checkParamCount(e, 1))
 895         return;
 896
 897     QString key, value;
 898     for (int i = 0; i < e->params().count() - 1; i++) {
 899         QString key = e->params()[i].section("=", 0, 0);
 900         QString value = e->params()[i].section("=", 1);
 901         e->network()->addSupport(key, value);
 902     }
 903
 904     /* determine our prefixes here to get an accurate result */
 905     e->network()->determinePrefixes();
 906 }
 907
 908 /* RPL_UMODEIS - "<user_modes> [<user_mode_params>]" */
 909 void CoreSessionEventProcessor::processIrcEvent221(IrcEvent*)
 910 {
 911     // TODO: save information in network object
 912 }
 913
 914 /* RPL_STATSCONN - "Highest connection cout: 8000 (7999 clients)" */
 915 void CoreSessionEventProcessor::processIrcEvent250(IrcEvent*)
 916 {
 917     // TODO: save information in network object
 918 }
 919
 920 /* RPL_LOCALUSERS - "Current local user: 5024  Max: 7999 */
 921 void CoreSessionEventProcessor::processIrcEvent265(IrcEvent*)
 922 {
 923     // TODO: save information in network object
 924 }
 925
 926 /* RPL_GLOBALUSERS - "Current global users: 46093  Max: 47650" */
 927 void CoreSessionEventProcessor::processIrcEvent266(IrcEvent*)
 928 {
 929     // TODO: save information in network object
 930 }
 931
 932 /*
 933 WHOIS-Message:
 934    Replies 311 - 313, 317 - 319 are all replies generated in response to a WHOIS message.
 935   and 301 (RPL_AWAY)
 936               "<nick> :<away message>"
 937 WHO-Message:
 938    Replies 352 and 315 paired are used to answer a WHO message.
 939
 940 WHOWAS-Message:
 941    Replies 314 and 369 are responses to a WHOWAS message.
 942
 943 */
 944
 945 /* RPL_AWAY - "<nick> :<away message>" */
 946 void CoreSessionEventProcessor::processIrcEvent301(IrcEvent* e)
 947 {
 948     if (!checkParamCount(e, 2))
 949         return;
 950
 951     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 952     if (ircuser) {
 953         ircuser->setAway(true);
 954         ircuser->setAwayMessage(e->params().at(1));
 955         // lastAwayMessageTime is set in EventStringifier::processIrcEvent301(), no need to set it
 956         // here too
 957         // ircuser->setLastAwayMessageTime(now);
 958     }
 959 }
 960
 961 /* RPL_UNAWAY - ":You are no longer marked as being away" */
 962 void CoreSessionEventProcessor::processIrcEvent305(IrcEvent* e)
 963 {
 964     IrcUser* me = e->network()->me();
 965     if (me)
 966         me->setAway(false);
 967
 968     if (e->network()->autoAwayActive()) {
 969         e->network()->setAutoAwayActive(false);
 970         e->setFlag(EventManager::Silent);
 971     }
 972 }
 973
 974 /* RPL_NOWAWAY - ":You have been marked as being away" */
 975 void CoreSessionEventProcessor::processIrcEvent306(IrcEvent* e)
 976 {
 977     IrcUser* me = e->network()->me();
 978     if (me)
 979         me->setAway(true);
 980 }
 981
 982 /* RPL_WHOISSERVICE - "<user> is registered nick" */
 983 void CoreSessionEventProcessor::processIrcEvent307(IrcEvent* e)
 984 {
 985     if (!checkParamCount(e, 1))
 986         return;
 987
 988     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 989     if (ircuser)
 990         ircuser->setWhoisServiceReply(e->params().join(" "));
 991 }
 992
 993 /* RPL_SUSERHOST - "<user> is available for help." */
 994 void CoreSessionEventProcessor::processIrcEvent310(IrcEvent* e)
 995 {
 996     if (!checkParamCount(e, 1))
 997         return;
 998
 999     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1000     if (ircuser)
1001         ircuser->setSuserHost(e->params().join(" "));
1002 }
1003
1004 /*  RPL_WHOISUSER - "<nick> <user> <host> * :<real name>" */
1005 void CoreSessionEventProcessor::processIrcEvent311(IrcEvent* e)
1006 {
1007     if (!checkParamCount(e, 3))
1008         return;
1009
1010     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1011     if (ircuser) {
1012         ircuser->setUser(e->params().at(1));
1013         ircuser->setHost(e->params().at(2));
1014         ircuser->setRealName(e->params().last());
1015     }
1016 }
1017
1018 /*  RPL_WHOISSERVER -  "<nick> <server> :<server info>" */
1019 void CoreSessionEventProcessor::processIrcEvent312(IrcEvent* e)
1020 {
1021     if (!checkParamCount(e, 2))
1022         return;
1023
1024     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1025     if (ircuser)
1026         ircuser->setServer(e->params().at(1));
1027 }
1028
1029 /*  RPL_WHOISOPERATOR - "<nick> :is an IRC operator" */
1030 void CoreSessionEventProcessor::processIrcEvent313(IrcEvent* e)
1031 {
1032     if (!checkParamCount(e, 1))
1033         return;
1034
1035     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1036     if (ircuser)
1037         ircuser->setIrcOperator(e->params().last());
1038 }
1039
1040 /*  RPL_ENDOFWHO: "<name> :End of WHO list" */
1041 void CoreSessionEventProcessor::processIrcEvent315(IrcEvent* e)
1042 {
1043     if (!checkParamCount(e, 1))
1044         return;
1045
1046     if (coreNetwork(e)->setAutoWhoDone(e->params()[0]))
1047         e->setFlag(EventManager::Silent);
1048 }
1049
1050 /*  RPL_WHOISIDLE - "<nick> <integer> :seconds idle"
1051    (real life: "<nick> <integer> <integer> :seconds idle, signon time) */
1052 void CoreSessionEventProcessor::processIrcEvent317(IrcEvent* e)
1053 {
1054     if (!checkParamCount(e, 2))
1055         return;
1056
1057     QDateTime loginTime;
1058
1059     int idleSecs = e->params()[1].toInt();
1060     if (e->params().count() > 3) {  // if we have more then 3 params we have the above mentioned "real life" situation
1061         // Allow for 64-bit time
1062         qint64 logintime = e->params()[2].toLongLong();
1063         // Time in IRC protocol is defined as seconds.  Convert from seconds instead.
1064         // See https://doc.qt.io/qt-5/qdatetime.html#fromSecsSinceEpoch
1065 #if QT_VERSION >= 0x050800
1066         loginTime = QDateTime::fromSecsSinceEpoch(logintime);
1067 #else
1068         // fromSecsSinceEpoch() was added in Qt 5.8.  Manually downconvert to seconds for
1069         // now.
1070         // See https://doc.qt.io/qt-5/qdatetime.html#fromMSecsSinceEpoch
1071         loginTime = QDateTime::fromMSecsSinceEpoch((qint64)(logintime * 1000));
1072 #endif
1073     }
1074
1075     IrcUser* ircuser = e->network()->ircUser(e->params()[0]);
1076     if (ircuser) {
1077         ircuser->setIdleTime(e->timestamp().addSecs(-idleSecs));
1078         if (loginTime.isValid())
1079             ircuser->setLoginTime(loginTime);
1080     }
1081 }
1082
1083 /* RPL_LIST -  "<channel> <# visible> :<topic>" */
1084 void CoreSessionEventProcessor::processIrcEvent322(IrcEvent* e)
1085 {
1086     if (!checkParamCount(e, 1))
1087         return;
1088
1089     QString channelName;
1090     quint32 userCount = 0;
1091     QString topic;
1092
1093     switch (e->params().count()) {
1094     case 3:
1095         topic = e->params()[2];
1096         // fallthrough
1097     case 2:
1098         userCount = e->params()[1].toUInt();
1099         // fallthrough
1100     case 1:
1101         channelName = e->params()[0];
1102         // fallthrough
1103     default:
1104         break;
1105     }
1106     if (coreSession()->ircListHelper()->addChannel(e->networkId(), channelName, userCount, topic))
1107         e->stop();  // consumed by IrcListHelper, so don't further process/show this event
1108 }
1109
1110 /* RPL_LISTEND ":End of LIST" */
1111 void CoreSessionEventProcessor::processIrcEvent323(IrcEvent* e)
1112 {
1113     if (!checkParamCount(e, 1))
1114         return;
1115
1116     if (coreSession()->ircListHelper()->endOfChannelList(e->networkId()))
1117         e->stop();  // consumed by IrcListHelper, so don't further process/show this event
1118 }
1119
1120 /* RPL_CHANNELMODEIS - "<channel> <mode> <mode params>" */
1121 void CoreSessionEventProcessor::processIrcEvent324(IrcEvent* e)
1122 {
1123     processIrcEventMode(e);
1124 }
1125
1126 /*  RPL_WHOISACCOUNT - "<nick> <account> :is authed as" */
1127 void CoreSessionEventProcessor::processIrcEvent330(IrcEvent* e)
1128 {
1129     // Though the ":is authed as" remark should always be there, we should handle cases when it's
1130     // not included, too.
1131     if (!checkParamCount(e, 2))
1132         return;
1133
1134     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1135     if (ircuser) {
1136         ircuser->setAccount(e->params().at(1));
1137     }
1138 }
1139
1140 /* RPL_NOTOPIC */
1141 void CoreSessionEventProcessor::processIrcEvent331(IrcEvent* e)
1142 {
1143     if (!checkParamCount(e, 1))
1144         return;
1145
1146     IrcChannel* chan = e->network()->ircChannel(e->params()[0]);
1147     if (chan)
1148         chan->setTopic(QString());
1149 }
1150
1151 /* RPL_TOPIC */
1152 void CoreSessionEventProcessor::processIrcEvent332(IrcEvent* e)
1153 {
1154     if (!checkParamCount(e, 2))
1155         return;
1156
1157     IrcChannel* chan = e->network()->ircChannel(e->params()[0]);
1158     if (chan)
1159         chan->setTopic(e->params()[1]);
1160 }
1161
1162 /*  RPL_WHOREPLY: "<channel> <user> <host> <server> <nick>
1163               ( "H" / "G" > ["*"] [ ( "@" / "+" ) ] :<hopcount> <real name>" */
1164 void CoreSessionEventProcessor::processIrcEvent352(IrcEvent* e)
1165 {
1166     if (!checkParamCount(e, 6))
1167         return;
1168
1169     QString channel = e->params()[0];
1170     IrcUser* ircuser = e->network()->ircUser(e->params()[4]);
1171     if (ircuser) {
1172         // Only process the WHO information if an IRC user exists.  Don't create an IRC user here;
1173         // there's no way to track when the user quits, which would leave a phantom IrcUser lying
1174         // around.
1175         // NOTE:  Whenever MONITOR support is introduced, the IrcUser will be created by an
1176         // RPL_MONONLINE numeric before any WHO commands are run.
1177         processWhoInformation(e->network(),
1178                               channel,
1179                               ircuser,
1180                               e->params()[3],
1181                               e->params()[1],
1182                               e->params()[2],
1183                               e->params()[5],
1184                               e->params().last().section(" ", 1));
1185     }
1186
1187     // Check if channel name has a who in progress.
1188     if (coreNetwork(e)->isAutoWhoInProgress(channel)) {
1189         e->setFlag(EventManager::Silent);
1190     }
1191 }
1192
1193 /* RPL_NAMREPLY */
1194 void CoreSessionEventProcessor::processIrcEvent353(IrcEvent* e)
1195 {
1196     if (!checkParamCount(e, 3))
1197         return;
1198
1199     // param[0] is either "=", "*" or "@" indicating a public, private or secret channel
1200     // we don't use this information at the time beeing
1201     QString channelname = e->params()[1];
1202
1203     IrcChannel* channel = e->network()->ircChannel(channelname);
1204     if (!channel) {
1205         qWarning() << Q_FUNC_INFO << "Received unknown target channel:" << channelname;
1206         return;
1207     }
1208
1209     QStringList nicks;
1210     QStringList modes;
1211
1212     // Cache result of multi-prefix to avoid unneeded casts and lookups with each iteration.
1213     bool _useCapMultiPrefix = coreNetwork(e)->capEnabled(IrcCap::MULTI_PREFIX);
1214
1215     for (QString nick : e->params()[2].split(' ', QString::SkipEmptyParts)) {
1216         QString mode;
1217
1218         if (_useCapMultiPrefix) {
1219             // If multi-prefix is enabled, all modes will be sent in NAMES replies.
1220             // :hades.arpa 353 guest = #tethys :~&@%+aji &@Attila @+alyx +KindOne Argure
1221             // See: http://ircv3.net/specs/extensions/multi-prefix-3.1.html
1222             while (e->network()->prefixes().contains(nick[0])) {
1223                 // Mode found in 1 left-most character, add it to the list.
1224                 // Note: sending multiple modes may cause a warning in older clients.
1225                 // In testing, the clients still seemed to function fine.
1226                 mode.append(e->network()->prefixToMode(nick[0]));
1227                 // Remove this mode from the nick
1228                 nick = nick.remove(0, 1);
1229             }
1230         }
1231         else if (e->network()->prefixes().contains(nick[0])) {
1232             // Multi-prefix is disabled and a mode prefix was found.
1233             mode = e->network()->prefixToMode(nick[0]);
1234             nick = nick.mid(1);
1235         }
1236
1237         // If userhost-in-names capability is enabled, the following will be
1238         // in the form "nick!user@host" rather than "nick".  This works without
1239         // special handling as the following use nickFromHost() as needed.
1240         // See: http://ircv3.net/specs/extensions/userhost-in-names-3.2.html
1241
1242         nicks << nick;
1243         modes << mode;
1244     }
1245
1246     channel->joinIrcUsers(nicks, modes);
1247 }
1248
1249 /*  RPL_WHOSPCRPL: "<yournick> 152 #<channel> ~<ident> <host> <servname> <nick>
1250                     ("H"/ "G") <account> :<realname>"
1251 <channel> is * if not specific to any channel
1252 <account> is * if not logged in
1253 Follows HexChat's usage of 'whox'
1254 See https://github.com/hexchat/hexchat/blob/c874a9525c9b66f1d5ddcf6c4107d046eba7e2c5/src/common/proto-irc.c#L750
1255 And http://faerion.sourceforge.net/doc/irc/whox.var*/
1256 void CoreSessionEventProcessor::processIrcEvent354(IrcEvent* e)
1257 {
1258     // First only check if at least one parameter exists.  Otherwise, it'll stop the result from
1259     // being shown if the user chooses different parameters.
1260     if (!checkParamCount(e, 1))
1261         return;
1262
1263     if (e->params()[0].toUInt() != IrcCap::ACCOUNT_NOTIFY_WHOX_NUM) {
1264         // Ignore WHOX replies without expected number for we have no idea what fields are specified
1265         return;
1266     }
1267
1268     // Now we're fairly certain this is supposed to be an automated WHOX.  Bail out if it doesn't
1269     // match what we require - 9 parameters.
1270     if (!checkParamCount(e, 9))
1271         return;
1272
1273     QString channel = e->params()[1];
1274     IrcUser* ircuser = e->network()->ircUser(e->params()[5]);
1275     if (ircuser) {
1276         // Only process the WHO information if an IRC user exists.  Don't create an IRC user here;
1277         // there's no way to track when the user quits, which would leave a phantom IrcUser lying
1278         // around.
1279         // NOTE:  Whenever MONITOR support is introduced, the IrcUser will be created by an
1280         // RPL_MONONLINE numeric before any WHO commands are run.
1281         processWhoInformation(e->network(), channel, ircuser, e->params()[4], e->params()[2], e->params()[3], e->params()[6], e->params().last());
1282         // Don't use .section(" ", 1) with WHOX replies, for there's no hopcount to trim out
1283
1284         // As part of IRCv3 account-notify, check account name
1285         // WHOX uses '0' to indicate logged-out, account-notify and extended-join uses '*'.
1286         QString newAccount = e->params()[7];
1287         if (newAccount != "0") {
1288             // Account logged in, set account name
1289             ircuser->setAccount(newAccount);
1290         }
1291         else {
1292             // Account logged out, set account name to logged-out
1293             ircuser->setAccount("*");
1294         }
1295     }
1296
1297     // Check if channel name has a who in progress.
1298     if (coreNetwork(e)->isAutoWhoInProgress(channel)) {
1299         e->setFlag(EventManager::Silent);
1300     }
1301 }
1302
1303 void CoreSessionEventProcessor::processWhoInformation(Network* net,
1304                                                       const QString& targetChannel,
1305                                                       IrcUser* ircUser,
1306                                                       const QString& server,
1307                                                       const QString& user,
1308                                                       const QString& host,
1309                                                       const QString& awayStateAndModes,
1310                                                       const QString& realname)
1311 {
1312     ircUser->setUser(user);
1313     ircUser->setHost(host);
1314     ircUser->setServer(server);
1315     ircUser->setRealName(realname);
1316
1317     bool away = awayStateAndModes.contains("G", Qt::CaseInsensitive);
1318     ircUser->setAway(away);
1319
1320     if (net->capEnabled(IrcCap::MULTI_PREFIX)) {
1321         // If multi-prefix is enabled, all modes will be sent in WHO replies.
1322         // :kenny.chatspike.net 352 guest #test grawity broken.symlink *.chatspike.net grawity H@%+ :0 Mantas M.
1323         // See: http://ircv3.net/specs/extensions/multi-prefix-3.1.html
1324         QString uncheckedModes = awayStateAndModes;
1325         QString validModes = QString();
1326         while (!uncheckedModes.isEmpty()) {
1327             // Mode found in 1 left-most character, add it to the list
1328             if (net->prefixes().contains(uncheckedModes[0])) {
1329                 validModes.append(net->prefixToMode(uncheckedModes[0]));
1330             }
1331             // Remove this mode from the list of unchecked modes
1332             uncheckedModes = uncheckedModes.remove(0, 1);
1333         }
1334
1335         // Some IRC servers decide to not follow the spec, returning only -some- of the user
1336         // modes in WHO despite listing them all in NAMES.  For now, assume it can only add
1337         // and not take away.  *sigh*
1338         if (!validModes.isEmpty()) {
1339             if (targetChannel != "*") {
1340                 // Channel-specific modes received, apply to given channel only
1341                 IrcChannel* ircChan = net->ircChannel(targetChannel);
1342                 if (ircChan) {
1343                     // Do one mode at a time
1344                     // TODO Better way of syncing this without breaking protocol?
1345                     for (int i = 0; i < validModes.count(); ++i) {
1346                         ircChan->addUserMode(ircUser, validModes.at(i));
1347                     }
1348                 }
1349             }
1350             else {
1351                 // Modes apply to the user everywhere
1352                 ircUser->addUserModes(validModes);
1353             }
1354         }
1355     }
1356 }
1357
1358 /* ERR_NOSUCHCHANNEL - "<channel name> :No such channel" */
1359 void CoreSessionEventProcessor::processIrcEvent403(IrcEventNumeric* e)
1360 {
1361     // If this is the result of an AutoWho, hide it.  It's confusing to show to the user.
1362     // Though the ":No such channel" remark should always be there, we should handle cases when it's
1363     // not included, too.
1364     if (!checkParamCount(e, 1))
1365         return;
1366
1367     QString channelOrNick = e->params()[0];
1368     // Check if channel name has a who in progress.
1369     // If not, then check if user nick exists and has a who in progress.
1370     if (coreNetwork(e)->isAutoWhoInProgress(channelOrNick)) {
1371         qDebug() << "Channel/nick" << channelOrNick << "no longer exists during AutoWho, ignoring";
1372         e->setFlag(EventManager::Silent);
1373     }
1374 }
1375
1376 /* ERR_ERRONEUSNICKNAME */
1377 void CoreSessionEventProcessor::processIrcEvent432(IrcEventNumeric* e)
1378 {
1379     if (!checkParamCount(e, 1))
1380         return;
1381
1382     QString errnick;
1383     if (e->params().count() < 2) {
1384         // handle unreal-ircd bug, where unreal ircd doesnt supply a TARGET in ERR_ERRONEUSNICKNAME during registration phase:
1385         // nick @@@
1386         // :irc.scortum.moep.net 432  @@@ :Erroneous Nickname: Illegal characters
1387         // correct server reply:
1388         // :irc.scortum.moep.net 432 * @@@ :Erroneous Nickname: Illegal characters
1389         e->params().prepend(e->target());
1390         e->setTarget("*");
1391     }
1392     errnick = e->params()[0];
1393
1394     tryNextNick(e, errnick, true /* erroneus */);
1395 }
1396
1397 /* ERR_NICKNAMEINUSE */
1398 void CoreSessionEventProcessor::processIrcEvent433(IrcEventNumeric* e)
1399 {
1400     if (!checkParamCount(e, 1))
1401         return;
1402
1403     QString errnick = e->params().first();
1404
1405     // if there is a problem while connecting to the server -> we handle it
1406     // but only if our connection has not been finished yet...
1407     if (!e->network()->currentServer().isEmpty())
1408         return;
1409
1410     tryNextNick(e, errnick);
1411 }
1412
1413 /* ERR_UNAVAILRESOURCE */
1414 void CoreSessionEventProcessor::processIrcEvent437(IrcEventNumeric* e)
1415 {
1416     if (!checkParamCount(e, 1))
1417         return;
1418
1419     QString errnick = e->params().first();
1420
1421     // if there is a problem while connecting to the server -> we handle it
1422     // but only if our connection has not been finished yet...
1423     if (!e->network()->currentServer().isEmpty())
1424         return;
1425
1426     if (!e->network()->isChannelName(errnick))
1427         tryNextNick(e, errnick);
1428 }
1429
1430 /* template
1431 void CoreSessionEventProcessor::processIrcEvent(IrcEvent *e) {
1432   if(!checkParamCount(e, 1))
1433     return;
1434
1435 }
1436 */
1437
1438 /* Handle signals from Netsplit objects  */
1439
1440 void CoreSessionEventProcessor::handleNetsplitJoin(
1441     Network* net, const QString& channel, const QStringList& users, const QStringList& modes, const QString& quitMessage)
1442 {
1443     IrcChannel* ircChannel = net->ircChannel(channel);
1444     if (!ircChannel) {
1445         return;
1446     }
1447     QList<IrcUser*> ircUsers;
1448     QStringList newModes = modes;
1449     QStringList newUsers = users;
1450
1451     for (const QString& user : users) {
1452         IrcUser* iu = net->ircUser(nickFromMask(user));
1453         if (iu)
1454             ircUsers.append(iu);
1455         else {  // the user already quit
1456             int idx = users.indexOf(user);
1457             newUsers.removeAt(idx);
1458             newModes.removeAt(idx);
1459         }
1460     }
1461
1462     ircChannel->joinIrcUsers(ircUsers, newModes);
1463     NetworkSplitEvent* event = new NetworkSplitEvent(EventManager::NetworkSplitJoin, net, channel, newUsers, quitMessage);
1464     emit newEvent(event);
1465 }
1466
1467 void CoreSessionEventProcessor::handleNetsplitQuit(Network* net, const QString& channel, const QStringList& users, const QString& quitMessage)
1468 {
1469     NetworkSplitEvent* event = new NetworkSplitEvent(EventManager::NetworkSplitQuit, net, channel, users, quitMessage);
1470     emit newEvent(event);
1471     for (const QString& user : users) {
1472         IrcUser* ircUser = net->ircUser(nickFromMask(user));
1473         if (ircUser) ircUser->quit();
1474     }
1475 }
1476
1477 void CoreSessionEventProcessor::handleEarlyNetsplitJoin(Network* net, const QString& channel, const QStringList& users, const QStringList& modes)
1478 {
1479     IrcChannel* ircChannel = net->ircChannel(channel);
1480     if (!ircChannel) {
1481         qDebug() << "handleEarlyNetsplitJoin(): channel " << channel << " invalid";
1482         return;
1483     }
1484     QList<NetworkEvent*> events;
1485     QList<IrcUser*> ircUsers;
1486     QStringList newModes = modes;
1487
1488     for (const QString& user : users) {
1489         IrcUser* ircUser = net->updateNickFromMask(user);
1490         if (ircUser) {
1491             ircUsers.append(ircUser);
1492             // fake event for scripts that consume join events
1493             events << new IrcEvent(EventManager::IrcEventJoin, net, {}, ircUser->hostmask(), QStringList() << channel);
1494         }
1495         else {
1496             newModes.removeAt(users.indexOf(user));
1497         }
1498     }
1499     ircChannel->joinIrcUsers(ircUsers, newModes);
1500     for (NetworkEvent* event : events) {
1501         event->setFlag(EventManager::Fake);  // ignore this in here!
1502         emit newEvent(event);
1503     }
1504 }
1505
1506 void CoreSessionEventProcessor::handleNetsplitFinished()
1507 {
1508     auto* n = qobject_cast<Netsplit*>(sender());
1509     Q_ASSERT(n);
1510     QHash<QString, Netsplit*> splithash = _netsplits.take(n->network());
1511     splithash.remove(splithash.key(n));
1512     if (splithash.count())
1513         _netsplits[n->network()] = splithash;
1514     n->deleteLater();
1515 }
1516
1517 void CoreSessionEventProcessor::destroyNetsplits(NetworkId netId)
1518 {
1519     Network* net = coreSession()->network(netId);
1520     if (!net)
1521         return;
1522
1523     QHash<QString, Netsplit*> splits = _netsplits.take(net);
1524     qDeleteAll(splits);
1525 }
1526
1527 /*******************************/
1528 /******** CTCP HANDLING ********/
1529 /*******************************/
1530
1531 void CoreSessionEventProcessor::processCtcpEvent(CtcpEvent* e)
1532 {
1533     if (e->testFlag(EventManager::Self))
1534         return;  // ignore ctcp events generated by user input
1535
1536     if (e->type() != EventManager::CtcpEvent || e->ctcpType() != CtcpEvent::Query)
1537         return;
1538
1539     handle(e->ctcpCmd(), Q_ARG(CtcpEvent*, e));
1540 }
1541
1542 void CoreSessionEventProcessor::defaultHandler(const QString& ctcpCmd, CtcpEvent* e)
1543 {
1544     // This handler is only there to avoid warnings for unknown CTCPs
1545     Q_UNUSED(e);
1546     Q_UNUSED(ctcpCmd);
1547 }
1548
1549 void CoreSessionEventProcessor::handleCtcpAction(CtcpEvent* e)
1550 {
1551     // This handler is only there to feed CLIENTINFO
1552     Q_UNUSED(e);
1553 }
1554
1555 void CoreSessionEventProcessor::handleCtcpClientinfo(CtcpEvent* e)
1556 {
1557     QStringList supportedHandlers;
1558     for (const QString& handler : providesHandlers())
1559         supportedHandlers << handler.toUpper();
1560     std::sort(supportedHandlers.begin(), supportedHandlers.end());
1561     e->setReply(supportedHandlers.join(" "));
1562 }
1563
1564 // http://www.irchelp.org/irchelp/rfc/ctcpspec.html
1565 // http://en.wikipedia.org/wiki/Direct_Client-to-Client
1566 void CoreSessionEventProcessor::handleCtcpDcc(CtcpEvent* e)
1567 {
1568     // DCC support is unfinished, experimental and potentially dangerous, so make it opt-in
1569     if (!Quassel::isOptionSet("enable-experimental-dcc")) {
1570         qInfo() << "DCC disabled, start core with --enable-experimental-dcc if you really want to try it out";
1571         return;
1572     }
1573
1574     // normal:  SEND <filename> <ip> <port> [<filesize>]
1575     // reverse: SEND <filename> <ip> 0 <filesize> <token>
1576     QStringList params = e->param().split(' ');
1577     if (params.count()) {
1578         QString cmd = params[0].toUpper();
1579         if (cmd == "SEND") {
1580             if (params.count() < 4) {
1581                 qWarning() << "Invalid DCC SEND request:" << e;  // TODO emit proper error to client
1582                 return;
1583             }
1584             QString filename = params[1];
1585             QHostAddress address;
1586             quint16 port = params[3].toUShort();
1587             quint64 size = 0;
1588             QString numIp = params[2];  // this is either IPv4 as a 32 bit value, or IPv6 (which always contains a colon)
1589             if (numIp.contains(':')) {  // IPv6
1590                 if (!address.setAddress(numIp)) {
1591                     qWarning() << "Invalid IPv6:" << numIp;
1592                     return;
1593                 }
1594             }
1595             else {
1596                 address.setAddress(numIp.toUInt());
1597             }
1598
1599             if (port == 0) {  // Reverse DCC is indicated by a 0 port
1600                 emit newEvent(new MessageEvent(Message::Error,
1601                                                e->network(),
1602                                                tr("Reverse DCC SEND not supported"),
1603                                                e->prefix(),
1604                                                e->target(),
1605                                                Message::None,
1606                                                e->timestamp()));
1607                 return;
1608             }
1609             if (port < 1024) {
1610                 qWarning() << "Privileged port requested:" << port;  // FIXME ask user if this is ok
1611             }
1612
1613             if (params.count() > 4) {  // filesize is optional
1614                 size = params[4].toULong();
1615             }
1616
1617             // TODO: check if target is the right thing to use for the partner
1618             CoreTransfer* transfer = new CoreTransfer(Transfer::Direction::Receive, e->target(), filename, address, port, size, this);
1619             coreSession()->signalProxy()->synchronize(transfer);
1620             coreSession()->transferManager()->addTransfer(transfer);
1621         }
1622         else {
1623             emit newEvent(new MessageEvent(Message::Error,
1624                                            e->network(),
1625                                            tr("DCC %1 not supported").arg(cmd),
1626                                            e->prefix(),
1627                                            e->target(),
1628                                            Message::None,
1629                                            e->timestamp()));
1630             return;
1631         }
1632     }
1633 }
1634
1635 void CoreSessionEventProcessor::handleCtcpPing(CtcpEvent* e)
1636 {
1637     e->setReply(e->param().isNull() ? "" : e->param());
1638 }
1639
1640 void CoreSessionEventProcessor::handleCtcpTime(CtcpEvent* e)
1641 {
1642     // Use the ISO standard to avoid locale-specific translated names
1643     // Include timezone offset data to show which timezone a user's in, otherwise we're providing
1644     // NTP-over-IRC with terrible accuracy.
1645     e->setReply(formatDateTimeToOffsetISO(QDateTime::currentDateTime()));
1646 }
1647
1648 void CoreSessionEventProcessor::handleCtcpVersion(CtcpEvent* e)
1649 {
1650     // Deliberately do not translate project name
1651     // Use the ISO standard to avoid locale-specific translated names
1652     // Use UTC time to provide a consistent string regardless of timezone
1653     // (Statistics tracking tools usually only group client versions by exact string matching)
1654     e->setReply(QString("Quassel IRC %1 (version date %2) -- https://www.quassel-irc.org")
1655                     .arg(Quassel::buildInfo().plainVersionString)
1656                     .arg(Quassel::buildInfo().commitDate.isEmpty()
1657                              ? "unknown"
1658                              : tryFormatUnixEpoch(Quassel::buildInfo().commitDate, Qt::DateFormat::ISODate, true)));
1659 }