src/core/coresessioneventprocessor.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2020 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  19  ***************************************************************************/
  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 void CoreSessionEventProcessor::processIrcEventInvite(IrcEvent* e)
 365 {
 366     if (checkParamCount(e, 2)) {
 367         e->network()->updateNickFromMask(e->prefix());
 368     }
 369 }
 370
 371 /*  JOIN: ":<nick!user@host> JOIN <channel>" */
 372 void CoreSessionEventProcessor::processIrcEventJoin(IrcEvent* e)
 373 {
 374     if (e->testFlag(EventManager::Fake))  // generated by handleEarlyNetsplitJoin
 375         return;
 376
 377     if (!checkParamCount(e, 1))
 378         return;
 379
 380     CoreNetwork* net = coreNetwork(e);
 381     QString channel = e->params()[0];
 382     IrcUser* ircuser = net->updateNickFromMask(e->prefix());
 383
 384     if (net->capEnabled(IrcCap::EXTENDED_JOIN)) {
 385         if (e->params().count() < 3) {
 386             // Some IRC servers don't send extended-join events in all situations.  Rather than
 387             // ignore the join entirely, treat it as a regular join with a debug-level log entry.
 388             // See:  https://github.com/inspircd/inspircd/issues/821
 389             qDebug() << "extended-join requires 3 params, got:" << e->params()
 390                      << ", handling as a "
 391                         "regular join";
 392         }
 393         else {
 394             // If logged in, :nick!user@host JOIN #channelname accountname :Real Name
 395             // If logged out, :nick!user@host JOIN #channelname * :Real Name
 396             // See:  http://ircv3.net/specs/extensions/extended-join-3.1.html
 397             // WHOX uses '0' to indicate logged-out, account-notify and extended-join uses '*'.
 398             // As '*' is used internally to represent logged-out, no need to handle that differently.
 399             ircuser->setAccount(e->params()[1]);
 400             // Update the user's real name, too
 401             ircuser->setRealName(e->params()[2]);
 402         }
 403     }
 404     // Else :nick!user@host JOIN #channelname
 405
 406     bool handledByNetsplit = false;
 407     for (Netsplit* n : _netsplits.value(e->network())) {
 408         handledByNetsplit = n->userJoined(e->prefix(), channel);
 409         if (handledByNetsplit)
 410             break;
 411     }
 412
 413     // With "away-notify" enabled, some IRC servers forget to send :away messages for users who join
 414     // channels while away.  Unfortunately, working around this involves WHO'ng every single user as
 415     // they join, which is not very efficient.  If at all possible, it's better to get the issue
 416     // fixed in the IRC server instead.
 417     //
 418     // If pursuing a workaround instead, this is where you'd do it.  Check the version control
 419     // history for the commit that added this comment to see how to implement it - there's some
 420     // unexpected situations to watch out for!
 421     //
 422     // See https://ircv3.net/specs/extensions/away-notify-3.1.html
 423
 424     if (!handledByNetsplit)
 425         ircuser->joinChannel(channel);
 426     else
 427         e->setFlag(EventManager::Netsplit);
 428
 429     if (net->isMe(ircuser)) {
 430         net->setChannelJoined(channel);
 431         // Mark the message as Self
 432         e->setFlag(EventManager::Self);
 433         // FIXME use event
 434         net->putRawLine(net->serverEncode("MODE " + channel));  // we want to know the modes of the channel we just joined, so we ask politely
 435     }
 436 }
 437
 438 void CoreSessionEventProcessor::lateProcessIrcEventKick(IrcEvent* e)
 439 {
 440     if (checkParamCount(e, 2)) {
 441         e->network()->updateNickFromMask(e->prefix());
 442         IrcUser* victim = e->network()->ircUser(e->params().at(1));
 443         if (victim) {
 444             victim->partChannel(e->params().at(0));
 445             // if(e->network()->isMe(victim)) e->network()->setKickedFromChannel(channel);
 446         }
 447     }
 448 }
 449
 450 void CoreSessionEventProcessor::processIrcEventMode(IrcEvent* e)
 451 {
 452     if (!checkParamCount(e, 2))
 453         return;
 454
 455     if (e->network()->isChannelName(e->params().first())) {
 456         // Channel Modes
 457
 458         IrcChannel* channel = e->network()->ircChannel(e->params()[0]);
 459         if (!channel) {
 460             // we received mode information for a channel we're not in. that means probably we've just been kicked out or something like
 461             // that anyways: we don't have a place to store the data --> discard the info.
 462             return;
 463         }
 464
 465         QString modes = e->params()[1];
 466         bool add = true;
 467         int paramOffset = 2;
 468         for (auto mode : modes) {
 469             if (mode == '+') {
 470                 add = true;
 471                 continue;
 472             }
 473             if (mode == '-') {
 474                 add = false;
 475                 continue;
 476             }
 477
 478             if (e->network()->prefixModes().contains(mode)) {
 479                 // user channel modes (op, voice, etc...)
 480                 if (paramOffset < e->params().count()) {
 481                     IrcUser* ircUser = e->network()->ircUser(e->params()[paramOffset]);
 482                     if (!ircUser) {
 483                         qWarning() << Q_FUNC_INFO << "Unknown IrcUser:" << e->params()[paramOffset];
 484                     }
 485                     else {
 486                         if (add) {
 487                             bool handledByNetsplit = false;
 488                             QHash<QString, Netsplit*> splits = _netsplits.value(e->network());
 489                             for (Netsplit* n : _netsplits.value(e->network())) {
 490                                 handledByNetsplit = n->userAlreadyJoined(ircUser->hostmask(), channel->name());
 491                                 if (handledByNetsplit) {
 492                                     n->addMode(ircUser->hostmask(), channel->name(), QString(mode));
 493                                     break;
 494                                 }
 495                             }
 496                             if (!handledByNetsplit)
 497                                 channel->addUserMode(ircUser, QString(mode));
 498                         }
 499                         else
 500                             channel->removeUserMode(ircUser, QString(mode));
 501                     }
 502                 }
 503                 else {
 504                     qWarning() << "Received MODE with too few parameters:" << e->params();
 505                 }
 506                 ++paramOffset;
 507             }
 508             else {
 509                 // regular channel modes
 510                 QString value;
 511                 Network::ChannelModeType modeType = e->network()->channelModeType(mode);
 512                 if (modeType == Network::A_CHANMODE || modeType == Network::B_CHANMODE || (modeType == Network::C_CHANMODE && add)) {
 513                     if (paramOffset < e->params().count()) {
 514                         value = e->params()[paramOffset];
 515                     }
 516                     else {
 517                         qWarning() << "Received MODE with too few parameters:" << e->params();
 518                     }
 519                     ++paramOffset;
 520                 }
 521
 522                 if (add)
 523                     channel->addChannelMode(mode, value);
 524                 else
 525                     channel->removeChannelMode(mode, value);
 526             }
 527         }
 528     }
 529     else {
 530         // pure User Modes
 531         IrcUser* ircUser = e->network()->newIrcUser(e->params().first());
 532         QString modeString(e->params()[1]);
 533         QString addModes;
 534         QString removeModes;
 535         bool add = false;
 536         for (int c = 0; c < modeString.count(); c++) {
 537             if (modeString[c] == '+') {
 538                 add = true;
 539                 continue;
 540             }
 541             if (modeString[c] == '-') {
 542                 add = false;
 543                 continue;
 544             }
 545             if (add)
 546                 addModes += modeString[c];
 547             else
 548                 removeModes += modeString[c];
 549         }
 550         if (!addModes.isEmpty())
 551             ircUser->addUserModes(addModes);
 552         if (!removeModes.isEmpty())
 553             ircUser->removeUserModes(removeModes);
 554
 555         if (e->network()->isMe(ircUser)) {
 556             // Mark the message as Self
 557             e->setFlag(EventManager::Self);
 558             coreNetwork(e)->updatePersistentModes(addModes, removeModes);
 559         }
 560     }
 561 }
 562
 563 void CoreSessionEventProcessor::processIrcEventNick(IrcEvent* e)
 564 {
 565     if (checkParamCount(e, 1)) {
 566         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 567         if (!ircuser) {
 568             qWarning() << Q_FUNC_INFO << "Unknown IrcUser!";
 569             return;
 570         }
 571
 572         if (e->network()->isMe(ircuser)) {
 573             // Mark the message as Self
 574             e->setFlag(EventManager::Self);
 575         }
 576
 577         // Actual processing is handled in lateProcessIrcEventNick(), this just sets the event flag
 578     }
 579 }
 580
 581 void CoreSessionEventProcessor::lateProcessIrcEventNick(IrcEvent* e)
 582 {
 583     if (checkParamCount(e, 1)) {
 584         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 585         if (!ircuser) {
 586             qWarning() << Q_FUNC_INFO << "Unknown IrcUser!";
 587             return;
 588         }
 589         QString newnick = e->params().at(0);
 590         QString oldnick = ircuser->nick();
 591
 592         // the order is cruicial
 593         // otherwise the client would rename the buffer, see that the assigned ircuser doesn't match anymore
 594         // and remove the ircuser from the querybuffer leading to a wrong on/offline state
 595         ircuser->setNick(newnick);
 596         coreSession()->renameBuffer(e->networkId(), newnick, oldnick);
 597     }
 598 }
 599
 600 void CoreSessionEventProcessor::processIrcEventPart(IrcEvent* e)
 601 {
 602     if (checkParamCount(e, 1)) {
 603         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 604         if (!ircuser) {
 605             qWarning() << Q_FUNC_INFO << "Unknown IrcUser!";
 606             return;
 607         }
 608
 609         if (e->network()->isMe(ircuser)) {
 610             // Mark the message as Self
 611             e->setFlag(EventManager::Self);
 612         }
 613
 614         // Actual processing is handled in lateProcessIrcEventNick(), this just sets the event flag
 615     }
 616 }
 617
 618 void CoreSessionEventProcessor::lateProcessIrcEventPart(IrcEvent* e)
 619 {
 620     if (checkParamCount(e, 1)) {
 621         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 622         if (!ircuser) {
 623             qWarning() << Q_FUNC_INFO << "Unknown IrcUser!";
 624             return;
 625         }
 626         QString channel = e->params().at(0);
 627         ircuser->partChannel(channel);
 628         if (e->network()->isMe(ircuser)) {
 629             qobject_cast<CoreNetwork*>(e->network())->setChannelParted(channel);
 630         }
 631     }
 632 }
 633
 634 void CoreSessionEventProcessor::processIrcEventPing(IrcEvent* e)
 635 {
 636     QString param = e->params().count() ? e->params().first() : QString();
 637     // FIXME use events
 638     // Take priority so this won't get stuck behind other queued messages.
 639     coreNetwork(e)->putRawLine("PONG " + coreNetwork(e)->serverEncode(param), true);
 640 }
 641
 642 void CoreSessionEventProcessor::processIrcEventPong(IrcEvent* e)
 643 {
 644     // Ensure we get at least one parameter
 645     if (!checkParamCount(e, 1))
 646         return;
 647
 648     // Some IRC servers respond with only one parameter, others respond with two, with the latter
 649     // being the text sent.  Handle both situations.
 650     QString timestamp;
 651     if (e->params().count() < 2) {
 652         // Only one parameter received
 653         // :localhost PONG 02:43:49.565
 654         timestamp = e->params().at(0);
 655     }
 656     else {
 657         // Two parameters received, pick the second
 658         // :localhost PONG localhost :02:43:49.565
 659         timestamp = e->params().at(1);
 660     }
 661
 662     // The server is supposed to send back what we passed as parameter, and we send a timestamp.
 663     // However, using quote and whatnot, one can send arbitrary pings, and IRC servers may decide to
 664     // ignore our requests entirely and send whatever they want, so we have to do some sanity
 665     // checks.
 666     //
 667     // Attempt to parse the timestamp
 668     QTime sendTime = QTime::fromString(timestamp, "hh:mm:ss.zzz");
 669     if (sendTime.isValid()) {
 670         // Mark IRC server as sending valid ping replies
 671         if (!coreNetwork(e)->isPongTimestampValid()) {
 672             coreNetwork(e)->setPongTimestampValid(true);
 673             // Add a message the first time it happens
 674             qDebug().nospace() << "Received PONG with valid timestamp, marking pong replies on "
 675                                   "network "
 676                                << "\"" << qPrintable(e->network()->networkName())
 677                                << "\" (ID: " << qPrintable(QString::number(e->network()->networkId().toInt()))
 678                                << ") as usable for latency measurement";
 679         }
 680         // Remove pending flag
 681         coreNetwork(e)->resetPongReplyPending();
 682
 683         // Don't show this in the UI
 684         e->setFlag(EventManager::Silent);
 685         // TODO:  To allow for a user-sent /ping (without arguments, so default timestamp is used),
 686         // this could track how many automated PINGs have been sent by the core and subtract one
 687         // each time, only marking the PING as silent if there's pending automated pong replies.
 688         // However, that's a behavior change which warrants further testing.  For now, take the
 689         // simpler, previous approach that errs on the side of silencing too much.
 690
 691         // Calculate latency from time difference, divided by 2 to account for round-trip time
 692         e->network()->setLatency(sendTime.msecsTo(QTime::currentTime()) / 2);
 693     }
 694     else if (coreNetwork(e)->isPongReplyPending() && !coreNetwork(e)->isPongTimestampValid()) {
 695         // There's an auto-PING reply pending and we've not yet received a PONG reply with a valid
 696         // timestamp.  It's possible this server will never respond with a valid timestamp, and thus
 697         // any automated PINGs will result in unwanted spamming of the server buffer.
 698
 699         // Don't show this in the UI
 700         e->setFlag(EventManager::Silent);
 701         // Remove pending flag
 702         coreNetwork(e)->resetPongReplyPending();
 703
 704         // Log a message
 705         qDebug().nospace() << "Received PONG with invalid timestamp from network "
 706                            << "\"" << qPrintable(e->network()->networkName())
 707                            << "\" (ID: " << qPrintable(QString::number(e->network()->networkId().toInt()))
 708                            << "), silencing, parameters are " << e->params();
 709     }
 710     // else: We're not expecting a PONG reply and timestamp is not valid, assume it's from the user
 711 }
 712
 713 void CoreSessionEventProcessor::processIrcEventQuit(IrcEvent* e)
 714 {
 715     IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 716     if (!ircuser)
 717         return;
 718
 719     if (e->network()->isMe(ircuser)) {
 720         // Mark the message as Self
 721         e->setFlag(EventManager::Self);
 722     }
 723
 724     QString msg;
 725     if (e->params().count() > 0)
 726         msg = e->params()[0];
 727
 728     // check if netsplit
 729     if (Netsplit::isNetsplit(msg)) {
 730         Netsplit* n;
 731         if (!_netsplits[e->network()].contains(msg)) {
 732             n = new Netsplit(e->network(), this);
 733             connect(n, &Netsplit::finished, this, &CoreSessionEventProcessor::handleNetsplitFinished);
 734             connect(n, &Netsplit::netsplitJoin, this, &CoreSessionEventProcessor::handleNetsplitJoin);
 735             connect(n, &Netsplit::netsplitQuit, this, &CoreSessionEventProcessor::handleNetsplitQuit);
 736             connect(n, &Netsplit::earlyJoin, this, &CoreSessionEventProcessor::handleEarlyNetsplitJoin);
 737             _netsplits[e->network()].insert(msg, n);
 738         }
 739         else {
 740             n = _netsplits[e->network()][msg];
 741         }
 742         // add this user to the netsplit
 743         n->userQuit(e->prefix(), ircuser->channels(), msg);
 744         e->setFlag(EventManager::Netsplit);
 745     }
 746     // normal quit is handled in lateProcessIrcEventQuit()
 747 }
 748
 749 void CoreSessionEventProcessor::lateProcessIrcEventQuit(IrcEvent* e)
 750 {
 751     if (e->testFlag(EventManager::Netsplit))
 752         return;
 753
 754     IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 755     if (!ircuser)
 756         return;
 757
 758     ircuser->quit();
 759 }
 760
 761 void CoreSessionEventProcessor::processIrcEventTopic(IrcEvent* e)
 762 {
 763     if (checkParamCount(e, 2)) {
 764         IrcUser* ircuser = e->network()->updateNickFromMask(e->prefix());
 765
 766         if (e->network()->isMe(ircuser)) {
 767             // Mark the message as Self
 768             e->setFlag(EventManager::Self);
 769         }
 770
 771         IrcChannel* channel = e->network()->ircChannel(e->params().at(0));
 772         if (channel)
 773             channel->setTopic(e->params().at(1));
 774     }
 775 }
 776
 777 /* ERROR - "ERROR :reason"
 778 Example:  ERROR :Closing Link: nickname[xxx.xxx.xxx.xxx] (Large base64 image paste.)
 779 See https://tools.ietf.org/html/rfc2812#section-3.7.4 */
 780 void CoreSessionEventProcessor::processIrcEventError(IrcEvent* e)
 781 {
 782     if (!checkParamCount(e, 1))
 783         return;
 784
 785     if (coreNetwork(e)->disconnectExpected()) {
 786         // During QUIT, the server should send an error (often, but not always, "Closing Link"). As
 787         // we're expecting it, don't show this to the user.
 788         e->setFlag(EventManager::Silent);
 789     }
 790 }
 791
 792 #ifdef HAVE_QCA2
 793 void CoreSessionEventProcessor::processKeyEvent(KeyEvent* e)
 794 {
 795     if (!Cipher::neededFeaturesAvailable()) {
 796         emit newEvent(new MessageEvent(Message::Error,
 797                                        e->network(),
 798                                        tr("Unable to perform key exchange, missing qca-ossl plugin."),
 799                                        e->prefix(),
 800                                        e->target(),
 801                                        Message::None,
 802                                        e->timestamp()));
 803         return;
 804     }
 805     auto* net = qobject_cast<CoreNetwork*>(e->network());
 806     Cipher* c = net->cipher(e->target());
 807     if (!c)  // happens when there is no CoreIrcChannel for the target (i.e. never?)
 808         return;
 809
 810     if (e->exchangeType() == KeyEvent::Init) {
 811         QByteArray pubKey = c->parseInitKeyX(e->key());
 812         if (pubKey.isEmpty()) {
 813             emit newEvent(new MessageEvent(Message::Error,
 814                                            e->network(),
 815                                            tr("Unable to parse the DH1080_INIT. Key exchange failed."),
 816                                            e->prefix(),
 817                                            e->target(),
 818                                            Message::None,
 819                                            e->timestamp()));
 820             return;
 821         }
 822         else {
 823             net->setCipherKey(e->target(), c->key());
 824             emit newEvent(new MessageEvent(Message::Info,
 825                                            e->network(),
 826                                            tr("Your key is set and messages will be encrypted."),
 827                                            e->prefix(),
 828                                            e->target(),
 829                                            Message::None,
 830                                            e->timestamp()));
 831             QList<QByteArray> p;
 832             p << net->serverEncode(e->target()) << net->serverEncode("DH1080_FINISH ") + pubKey;
 833             net->putCmd("NOTICE", p);
 834         }
 835     }
 836     else {
 837         if (c->parseFinishKeyX(e->key())) {
 838             net->setCipherKey(e->target(), c->key());
 839             emit newEvent(new MessageEvent(Message::Info,
 840                                            e->network(),
 841                                            tr("Your key is set and messages will be encrypted."),
 842                                            e->prefix(),
 843                                            e->target(),
 844                                            Message::None,
 845                                            e->timestamp()));
 846         }
 847         else {
 848             emit newEvent(new MessageEvent(Message::Info,
 849                                            e->network(),
 850                                            tr("Failed to parse DH1080_FINISH. Key exchange failed."),
 851                                            e->prefix(),
 852                                            e->target(),
 853                                            Message::None,
 854                                            e->timestamp()));
 855         }
 856     }
 857 }
 858 #endif
 859
 860 /* RPL_WELCOME */
 861 void CoreSessionEventProcessor::processIrcEvent001(IrcEventNumeric* e)
 862 {
 863     e->network()->setCurrentServer(e->prefix());
 864     e->network()->setMyNick(e->target());
 865 }
 866
 867 /* RPL_ISUPPORT */
 868 // TODO Complete 005 handling, also use sensible defaults for non-sent stuff
 869 void CoreSessionEventProcessor::processIrcEvent005(IrcEvent* e)
 870 {
 871     if (!checkParamCount(e, 1))
 872         return;
 873
 874     QString key, value;
 875     for (int i = 0; i < e->params().count() - 1; i++) {
 876         QString key = e->params()[i].section("=", 0, 0);
 877         QString value = e->params()[i].section("=", 1);
 878         e->network()->addSupport(key, value);
 879     }
 880
 881     /* determine our prefixes here to get an accurate result */
 882     e->network()->determinePrefixes();
 883 }
 884
 885 /* RPL_UMODEIS - "<user_modes> [<user_mode_params>]" */
 886 void CoreSessionEventProcessor::processIrcEvent221(IrcEvent*)
 887 {
 888     // TODO: save information in network object
 889 }
 890
 891 /* RPL_STATSCONN - "Highest connection cout: 8000 (7999 clients)" */
 892 void CoreSessionEventProcessor::processIrcEvent250(IrcEvent*)
 893 {
 894     // TODO: save information in network object
 895 }
 896
 897 /* RPL_LOCALUSERS - "Current local user: 5024  Max: 7999 */
 898 void CoreSessionEventProcessor::processIrcEvent265(IrcEvent*)
 899 {
 900     // TODO: save information in network object
 901 }
 902
 903 /* RPL_GLOBALUSERS - "Current global users: 46093  Max: 47650" */
 904 void CoreSessionEventProcessor::processIrcEvent266(IrcEvent*)
 905 {
 906     // TODO: save information in network object
 907 }
 908
 909 /*
 910 WHOIS-Message:
 911    Replies 311 - 313, 317 - 319 are all replies generated in response to a WHOIS message.
 912   and 301 (RPL_AWAY)
 913               "<nick> :<away message>"
 914 WHO-Message:
 915    Replies 352 and 315 paired are used to answer a WHO message.
 916
 917 WHOWAS-Message:
 918    Replies 314 and 369 are responses to a WHOWAS message.
 919
 920 */
 921
 922 /* RPL_AWAY - "<nick> :<away message>" */
 923 void CoreSessionEventProcessor::processIrcEvent301(IrcEvent* e)
 924 {
 925     if (!checkParamCount(e, 2))
 926         return;
 927
 928     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 929     if (ircuser) {
 930         ircuser->setAway(true);
 931         ircuser->setAwayMessage(e->params().at(1));
 932         // lastAwayMessageTime is set in EventStringifier::processIrcEvent301(), no need to set it
 933         // here too
 934         // ircuser->setLastAwayMessageTime(now);
 935     }
 936 }
 937
 938 /* RPL_UNAWAY - ":You are no longer marked as being away" */
 939 void CoreSessionEventProcessor::processIrcEvent305(IrcEvent* e)
 940 {
 941     IrcUser* me = e->network()->me();
 942     if (me)
 943         me->setAway(false);
 944
 945     if (e->network()->autoAwayActive()) {
 946         e->network()->setAutoAwayActive(false);
 947         e->setFlag(EventManager::Silent);
 948     }
 949 }
 950
 951 /* RPL_NOWAWAY - ":You have been marked as being away" */
 952 void CoreSessionEventProcessor::processIrcEvent306(IrcEvent* e)
 953 {
 954     IrcUser* me = e->network()->me();
 955     if (me)
 956         me->setAway(true);
 957 }
 958
 959 /* RPL_WHOISSERVICE - "<user> is registered nick" */
 960 void CoreSessionEventProcessor::processIrcEvent307(IrcEvent* e)
 961 {
 962     if (!checkParamCount(e, 1))
 963         return;
 964
 965     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 966     if (ircuser)
 967         ircuser->setWhoisServiceReply(e->params().join(" "));
 968 }
 969
 970 /* RPL_SUSERHOST - "<user> is available for help." */
 971 void CoreSessionEventProcessor::processIrcEvent310(IrcEvent* e)
 972 {
 973     if (!checkParamCount(e, 1))
 974         return;
 975
 976     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 977     if (ircuser)
 978         ircuser->setSuserHost(e->params().join(" "));
 979 }
 980
 981 /*  RPL_WHOISUSER - "<nick> <user> <host> * :<real name>" */
 982 void CoreSessionEventProcessor::processIrcEvent311(IrcEvent* e)
 983 {
 984     if (!checkParamCount(e, 3))
 985         return;
 986
 987     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
 988     if (ircuser) {
 989         ircuser->setUser(e->params().at(1));
 990         ircuser->setHost(e->params().at(2));
 991         ircuser->setRealName(e->params().last());
 992     }
 993 }
 994
 995 /*  RPL_WHOISSERVER -  "<nick> <server> :<server info>" */
 996 void CoreSessionEventProcessor::processIrcEvent312(IrcEvent* e)
 997 {
 998     if (!checkParamCount(e, 2))
 999         return;
1000
1001     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1002     if (ircuser)
1003         ircuser->setServer(e->params().at(1));
1004 }
1005
1006 /*  RPL_WHOISOPERATOR - "<nick> :is an IRC operator" */
1007 void CoreSessionEventProcessor::processIrcEvent313(IrcEvent* e)
1008 {
1009     if (!checkParamCount(e, 1))
1010         return;
1011
1012     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1013     if (ircuser)
1014         ircuser->setIrcOperator(e->params().last());
1015 }
1016
1017 /*  RPL_ENDOFWHO: "<name> :End of WHO list" */
1018 void CoreSessionEventProcessor::processIrcEvent315(IrcEvent* e)
1019 {
1020     if (!checkParamCount(e, 1))
1021         return;
1022
1023     if (coreNetwork(e)->setAutoWhoDone(e->params()[0]))
1024         e->setFlag(EventManager::Silent);
1025 }
1026
1027 /*  RPL_WHOISIDLE - "<nick> <integer> :seconds idle"
1028    (real life: "<nick> <integer> <integer> :seconds idle, signon time) */
1029 void CoreSessionEventProcessor::processIrcEvent317(IrcEvent* e)
1030 {
1031     if (!checkParamCount(e, 2))
1032         return;
1033
1034     QDateTime loginTime;
1035
1036     int idleSecs = e->params()[1].toInt();
1037     if (e->params().count() > 3) {  // if we have more then 3 params we have the above mentioned "real life" situation
1038         // Allow for 64-bit time
1039         qint64 logintime = e->params()[2].toLongLong();
1040         // Time in IRC protocol is defined as seconds.  Convert from seconds instead.
1041         // See https://doc.qt.io/qt-5/qdatetime.html#fromSecsSinceEpoch
1042 #if QT_VERSION >= 0x050800
1043         loginTime = QDateTime::fromSecsSinceEpoch(logintime);
1044 #else
1045         // fromSecsSinceEpoch() was added in Qt 5.8.  Manually downconvert to seconds for
1046         // now.
1047         // See https://doc.qt.io/qt-5/qdatetime.html#fromMSecsSinceEpoch
1048         loginTime = QDateTime::fromMSecsSinceEpoch((qint64)(logintime * 1000));
1049 #endif
1050     }
1051
1052     IrcUser* ircuser = e->network()->ircUser(e->params()[0]);
1053     if (ircuser) {
1054         ircuser->setIdleTime(e->timestamp().addSecs(-idleSecs));
1055         if (loginTime.isValid())
1056             ircuser->setLoginTime(loginTime);
1057     }
1058 }
1059
1060 /* RPL_LIST -  "<channel> <# visible> :<topic>" */
1061 void CoreSessionEventProcessor::processIrcEvent322(IrcEvent* e)
1062 {
1063     if (!checkParamCount(e, 1))
1064         return;
1065
1066     QString channelName;
1067     quint32 userCount = 0;
1068     QString topic;
1069
1070     switch (e->params().count()) {
1071     case 3:
1072         topic = e->params()[2];
1073         // fallthrough
1074     case 2:
1075         userCount = e->params()[1].toUInt();
1076         // fallthrough
1077     case 1:
1078         channelName = e->params()[0];
1079         // fallthrough
1080     default:
1081         break;
1082     }
1083     if (coreSession()->ircListHelper()->addChannel(e->networkId(), channelName, userCount, topic))
1084         e->stop();  // consumed by IrcListHelper, so don't further process/show this event
1085 }
1086
1087 /* RPL_LISTEND ":End of LIST" */
1088 void CoreSessionEventProcessor::processIrcEvent323(IrcEvent* e)
1089 {
1090     if (!checkParamCount(e, 1))
1091         return;
1092
1093     if (coreSession()->ircListHelper()->endOfChannelList(e->networkId()))
1094         e->stop();  // consumed by IrcListHelper, so don't further process/show this event
1095 }
1096
1097 /* RPL_CHANNELMODEIS - "<channel> <mode> <mode params>" */
1098 void CoreSessionEventProcessor::processIrcEvent324(IrcEvent* e)
1099 {
1100     processIrcEventMode(e);
1101 }
1102
1103 /*  RPL_WHOISACCOUNT - "<nick> <account> :is authed as" */
1104 void CoreSessionEventProcessor::processIrcEvent330(IrcEvent* e)
1105 {
1106     // Though the ":is authed as" remark should always be there, we should handle cases when it's
1107     // not included, too.
1108     if (!checkParamCount(e, 2))
1109         return;
1110
1111     IrcUser* ircuser = e->network()->ircUser(e->params().at(0));
1112     if (ircuser) {
1113         ircuser->setAccount(e->params().at(1));
1114     }
1115 }
1116
1117 /* RPL_NOTOPIC */
1118 void CoreSessionEventProcessor::processIrcEvent331(IrcEvent* e)
1119 {
1120     if (!checkParamCount(e, 1))
1121         return;
1122
1123     IrcChannel* chan = e->network()->ircChannel(e->params()[0]);
1124     if (chan)
1125         chan->setTopic(QString());
1126 }
1127
1128 /* RPL_TOPIC */
1129 void CoreSessionEventProcessor::processIrcEvent332(IrcEvent* e)
1130 {
1131     if (!checkParamCount(e, 2))
1132         return;
1133
1134     IrcChannel* chan = e->network()->ircChannel(e->params()[0]);
1135     if (chan)
1136         chan->setTopic(e->params()[1]);
1137 }
1138
1139 /*  RPL_WHOREPLY: "<channel> <user> <host> <server> <nick>
1140               ( "H" / "G" > ["*"] [ ( "@" / "+" ) ] :<hopcount> <real name>" */
1141 void CoreSessionEventProcessor::processIrcEvent352(IrcEvent* e)
1142 {
1143     if (!checkParamCount(e, 6))
1144         return;
1145
1146     QString channel = e->params()[0];
1147     IrcUser* ircuser = e->network()->ircUser(e->params()[4]);
1148     if (ircuser) {
1149         // Only process the WHO information if an IRC user exists.  Don't create an IRC user here;
1150         // there's no way to track when the user quits, which would leave a phantom IrcUser lying
1151         // around.
1152         // NOTE:  Whenever MONITOR support is introduced, the IrcUser will be created by an
1153         // RPL_MONONLINE numeric before any WHO commands are run.
1154         processWhoInformation(e->network(),
1155                               channel,
1156                               ircuser,
1157                               e->params()[3],
1158                               e->params()[1],
1159                               e->params()[2],
1160                               e->params()[5],
1161                               e->params().last().section(" ", 1));
1162     }
1163
1164     // Check if channel name has a who in progress.
1165     if (coreNetwork(e)->isAutoWhoInProgress(channel)) {
1166         e->setFlag(EventManager::Silent);
1167     }
1168 }
1169
1170 /* RPL_NAMREPLY */
1171 void CoreSessionEventProcessor::processIrcEvent353(IrcEvent* e)
1172 {
1173     if (!checkParamCount(e, 3))
1174         return;
1175
1176     // param[0] is either "=", "*" or "@" indicating a public, private or secret channel
1177     // we don't use this information at the time beeing
1178     QString channelname = e->params()[1];
1179
1180     IrcChannel* channel = e->network()->ircChannel(channelname);
1181     if (!channel) {
1182         qWarning() << Q_FUNC_INFO << "Received unknown target channel:" << channelname;
1183         return;
1184     }
1185
1186     QStringList nicks;
1187     QStringList modes;
1188
1189     // Cache result of multi-prefix to avoid unneeded casts and lookups with each iteration.
1190     bool _useCapMultiPrefix = coreNetwork(e)->capEnabled(IrcCap::MULTI_PREFIX);
1191
1192     for (QString nick : e->params()[2].split(' ', QString::SkipEmptyParts)) {
1193         QString mode;
1194
1195         if (_useCapMultiPrefix) {
1196             // If multi-prefix is enabled, all modes will be sent in NAMES replies.
1197             // :hades.arpa 353 guest = #tethys :~&@%+aji &@Attila @+alyx +KindOne Argure
1198             // See: http://ircv3.net/specs/extensions/multi-prefix-3.1.html
1199             while (e->network()->prefixes().contains(nick[0])) {
1200                 // Mode found in 1 left-most character, add it to the list.
1201                 // Note: sending multiple modes may cause a warning in older clients.
1202                 // In testing, the clients still seemed to function fine.
1203                 mode.append(e->network()->prefixToMode(nick[0]));
1204                 // Remove this mode from the nick
1205                 nick = nick.remove(0, 1);
1206             }
1207         }
1208         else if (e->network()->prefixes().contains(nick[0])) {
1209             // Multi-prefix is disabled and a mode prefix was found.
1210             mode = e->network()->prefixToMode(nick[0]);
1211             nick = nick.mid(1);
1212         }
1213
1214         // If userhost-in-names capability is enabled, the following will be
1215         // in the form "nick!user@host" rather than "nick".  This works without
1216         // special handling as the following use nickFromHost() as needed.
1217         // See: http://ircv3.net/specs/extensions/userhost-in-names-3.2.html
1218
1219         nicks << nick;
1220         modes << mode;
1221     }
1222
1223     channel->joinIrcUsers(nicks, modes);
1224 }
1225
1226 /*  RPL_WHOSPCRPL: "<yournick> 152 #<channel> ~<ident> <host> <servname> <nick>
1227                     ("H"/ "G") <account> :<realname>"
1228 <channel> is * if not specific to any channel
1229 <account> is * if not logged in
1230 Follows HexChat's usage of 'whox'
1231 See https://github.com/hexchat/hexchat/blob/c874a9525c9b66f1d5ddcf6c4107d046eba7e2c5/src/common/proto-irc.c#L750
1232 And http://faerion.sourceforge.net/doc/irc/whox.var*/
1233 void CoreSessionEventProcessor::processIrcEvent354(IrcEvent* e)
1234 {
1235     // First only check if at least one parameter exists.  Otherwise, it'll stop the result from
1236     // being shown if the user chooses different parameters.
1237     if (!checkParamCount(e, 1))
1238         return;
1239
1240     if (e->params()[0].toUInt() != IrcCap::ACCOUNT_NOTIFY_WHOX_NUM) {
1241         // Ignore WHOX replies without expected number for we have no idea what fields are specified
1242         return;
1243     }
1244
1245     // Now we're fairly certain this is supposed to be an automated WHOX.  Bail out if it doesn't
1246     // match what we require - 9 parameters.
1247     if (!checkParamCount(e, 9))
1248         return;
1249
1250     QString channel = e->params()[1];
1251     IrcUser* ircuser = e->network()->ircUser(e->params()[5]);
1252     if (ircuser) {
1253         // Only process the WHO information if an IRC user exists.  Don't create an IRC user here;
1254         // there's no way to track when the user quits, which would leave a phantom IrcUser lying
1255         // around.
1256         // NOTE:  Whenever MONITOR support is introduced, the IrcUser will be created by an
1257         // RPL_MONONLINE numeric before any WHO commands are run.
1258         processWhoInformation(e->network(), channel, ircuser, e->params()[4], e->params()[2], e->params()[3], e->params()[6], e->params().last());
1259         // Don't use .section(" ", 1) with WHOX replies, for there's no hopcount to trim out
1260
1261         // As part of IRCv3 account-notify, check account name
1262         // WHOX uses '0' to indicate logged-out, account-notify and extended-join uses '*'.
1263         QString newAccount = e->params()[7];
1264         if (newAccount != "0") {
1265             // Account logged in, set account name
1266             ircuser->setAccount(newAccount);
1267         }
1268         else {
1269             // Account logged out, set account name to logged-out
1270             ircuser->setAccount("*");
1271         }
1272     }
1273
1274     // Check if channel name has a who in progress.
1275     if (coreNetwork(e)->isAutoWhoInProgress(channel)) {
1276         e->setFlag(EventManager::Silent);
1277     }
1278 }
1279
1280 void CoreSessionEventProcessor::processWhoInformation(Network* net,
1281                                                       const QString& targetChannel,
1282                                                       IrcUser* ircUser,
1283                                                       const QString& server,
1284                                                       const QString& user,
1285                                                       const QString& host,
1286                                                       const QString& awayStateAndModes,
1287                                                       const QString& realname)
1288 {
1289     ircUser->setUser(user);
1290     ircUser->setHost(host);
1291     ircUser->setServer(server);
1292     ircUser->setRealName(realname);
1293
1294     bool away = awayStateAndModes.contains("G", Qt::CaseInsensitive);
1295     ircUser->setAway(away);
1296
1297     if (net->capEnabled(IrcCap::MULTI_PREFIX)) {
1298         // If multi-prefix is enabled, all modes will be sent in WHO replies.
1299         // :kenny.chatspike.net 352 guest #test grawity broken.symlink *.chatspike.net grawity H@%+ :0 Mantas M.
1300         // See: http://ircv3.net/specs/extensions/multi-prefix-3.1.html
1301         QString uncheckedModes = awayStateAndModes;
1302         QString validModes = QString();
1303         while (!uncheckedModes.isEmpty()) {
1304             // Mode found in 1 left-most character, add it to the list
1305             if (net->prefixes().contains(uncheckedModes[0])) {
1306                 validModes.append(net->prefixToMode(uncheckedModes[0]));
1307             }
1308             // Remove this mode from the list of unchecked modes
1309             uncheckedModes = uncheckedModes.remove(0, 1);
1310         }
1311
1312         // Some IRC servers decide to not follow the spec, returning only -some- of the user
1313         // modes in WHO despite listing them all in NAMES.  For now, assume it can only add
1314         // and not take away.  *sigh*
1315         if (!validModes.isEmpty()) {
1316             if (targetChannel != "*") {
1317                 // Channel-specific modes received, apply to given channel only
1318                 IrcChannel* ircChan = net->ircChannel(targetChannel);
1319                 if (ircChan) {
1320                     // Do one mode at a time
1321                     // TODO Better way of syncing this without breaking protocol?
1322                     for (int i = 0; i < validModes.count(); ++i) {
1323                         ircChan->addUserMode(ircUser, validModes.at(i));
1324                     }
1325                 }
1326             }
1327             else {
1328                 // Modes apply to the user everywhere
1329                 ircUser->addUserModes(validModes);
1330             }
1331         }
1332     }
1333 }
1334
1335 /* ERR_NOSUCHCHANNEL - "<channel name> :No such channel" */
1336 void CoreSessionEventProcessor::processIrcEvent403(IrcEventNumeric* e)
1337 {
1338     // If this is the result of an AutoWho, hide it.  It's confusing to show to the user.
1339     // Though the ":No such channel" remark should always be there, we should handle cases when it's
1340     // not included, too.
1341     if (!checkParamCount(e, 1))
1342         return;
1343
1344     QString channelOrNick = e->params()[0];
1345     // Check if channel name has a who in progress.
1346     // If not, then check if user nick exists and has a who in progress.
1347     if (coreNetwork(e)->isAutoWhoInProgress(channelOrNick)) {
1348         qDebug() << "Channel/nick" << channelOrNick << "no longer exists during AutoWho, ignoring";
1349         e->setFlag(EventManager::Silent);
1350     }
1351 }
1352
1353 /* ERR_ERRONEUSNICKNAME */
1354 void CoreSessionEventProcessor::processIrcEvent432(IrcEventNumeric* e)
1355 {
1356     if (!checkParamCount(e, 1))
1357         return;
1358
1359     QString errnick;
1360     if (e->params().count() < 2) {
1361         // handle unreal-ircd bug, where unreal ircd doesnt supply a TARGET in ERR_ERRONEUSNICKNAME during registration phase:
1362         // nick @@@
1363         // :irc.scortum.moep.net 432  @@@ :Erroneous Nickname: Illegal characters
1364         // correct server reply:
1365         // :irc.scortum.moep.net 432 * @@@ :Erroneous Nickname: Illegal characters
1366         e->params().prepend(e->target());
1367         e->setTarget("*");
1368     }
1369     errnick = e->params()[0];
1370
1371     tryNextNick(e, errnick, true /* erroneus */);
1372 }
1373
1374 /* ERR_NICKNAMEINUSE */
1375 void CoreSessionEventProcessor::processIrcEvent433(IrcEventNumeric* e)
1376 {
1377     if (!checkParamCount(e, 1))
1378         return;
1379
1380     QString errnick = e->params().first();
1381
1382     // if there is a problem while connecting to the server -> we handle it
1383     // but only if our connection has not been finished yet...
1384     if (!e->network()->currentServer().isEmpty())
1385         return;
1386
1387     tryNextNick(e, errnick);
1388 }
1389
1390 /* ERR_UNAVAILRESOURCE */
1391 void CoreSessionEventProcessor::processIrcEvent437(IrcEventNumeric* e)
1392 {
1393     if (!checkParamCount(e, 1))
1394         return;
1395
1396     QString errnick = e->params().first();
1397
1398     // if there is a problem while connecting to the server -> we handle it
1399     // but only if our connection has not been finished yet...
1400     if (!e->network()->currentServer().isEmpty())
1401         return;
1402
1403     if (!e->network()->isChannelName(errnick))
1404         tryNextNick(e, errnick);
1405 }
1406
1407 /* template
1408 void CoreSessionEventProcessor::processIrcEvent(IrcEvent *e) {
1409   if(!checkParamCount(e, 1))
1410     return;
1411
1412 }
1413 */
1414
1415 /* Handle signals from Netsplit objects  */
1416
1417 void CoreSessionEventProcessor::handleNetsplitJoin(
1418     Network* net, const QString& channel, const QStringList& users, const QStringList& modes, const QString& quitMessage)
1419 {
1420     IrcChannel* ircChannel = net->ircChannel(channel);
1421     if (!ircChannel) {
1422         return;
1423     }
1424     QList<IrcUser*> ircUsers;
1425     QStringList newModes = modes;
1426     QStringList newUsers = users;
1427
1428     for (const QString& user : users) {
1429         IrcUser* iu = net->ircUser(nickFromMask(user));
1430         if (iu)
1431             ircUsers.append(iu);
1432         else {  // the user already quit
1433             int idx = users.indexOf(user);
1434             newUsers.removeAt(idx);
1435             newModes.removeAt(idx);
1436         }
1437     }
1438
1439     ircChannel->joinIrcUsers(ircUsers, newModes);
1440     NetworkSplitEvent* event = new NetworkSplitEvent(EventManager::NetworkSplitJoin, net, channel, newUsers, quitMessage);
1441     emit newEvent(event);
1442 }
1443
1444 void CoreSessionEventProcessor::handleNetsplitQuit(Network* net, const QString& channel, const QStringList& users, const QString& quitMessage)
1445 {
1446     NetworkSplitEvent* event = new NetworkSplitEvent(EventManager::NetworkSplitQuit, net, channel, users, quitMessage);
1447     emit newEvent(event);
1448     for (const QString& user : users) {
1449         IrcUser* ircUser = net->ircUser(nickFromMask(user));
1450         if (ircUser) ircUser->quit();
1451     }
1452 }
1453
1454 void CoreSessionEventProcessor::handleEarlyNetsplitJoin(Network* net, const QString& channel, const QStringList& users, const QStringList& modes)
1455 {
1456     IrcChannel* ircChannel = net->ircChannel(channel);
1457     if (!ircChannel) {
1458         qDebug() << "handleEarlyNetsplitJoin(): channel " << channel << " invalid";
1459         return;
1460     }
1461     QList<NetworkEvent*> events;
1462     QList<IrcUser*> ircUsers;
1463     QStringList newModes = modes;
1464
1465     for (const QString& user : users) {
1466         IrcUser* ircUser = net->updateNickFromMask(user);
1467         if (ircUser) {
1468             ircUsers.append(ircUser);
1469             // fake event for scripts that consume join events
1470             events << new IrcEvent(EventManager::IrcEventJoin, net, {}, ircUser->hostmask(), QStringList() << channel);
1471         }
1472         else {
1473             newModes.removeAt(users.indexOf(user));
1474         }
1475     }
1476     ircChannel->joinIrcUsers(ircUsers, newModes);
1477     for (NetworkEvent* event : events) {
1478         event->setFlag(EventManager::Fake);  // ignore this in here!
1479         emit newEvent(event);
1480     }
1481 }
1482
1483 void CoreSessionEventProcessor::handleNetsplitFinished()
1484 {
1485     auto* n = qobject_cast<Netsplit*>(sender());
1486     Q_ASSERT(n);
1487     QHash<QString, Netsplit*> splithash = _netsplits.take(n->network());
1488     splithash.remove(splithash.key(n));
1489     if (splithash.count())
1490         _netsplits[n->network()] = splithash;
1491     n->deleteLater();
1492 }
1493
1494 void CoreSessionEventProcessor::destroyNetsplits(NetworkId netId)
1495 {
1496     Network* net = coreSession()->network(netId);
1497     if (!net)
1498         return;
1499
1500     QHash<QString, Netsplit*> splits = _netsplits.take(net);
1501     qDeleteAll(splits);
1502 }
1503
1504 /*******************************/
1505 /******** CTCP HANDLING ********/
1506 /*******************************/
1507
1508 void CoreSessionEventProcessor::processCtcpEvent(CtcpEvent* e)
1509 {
1510     if (e->testFlag(EventManager::Self))
1511         return;  // ignore ctcp events generated by user input
1512
1513     if (e->type() != EventManager::CtcpEvent || e->ctcpType() != CtcpEvent::Query)
1514         return;
1515
1516     handle(e->ctcpCmd(), Q_ARG(CtcpEvent*, e));
1517 }
1518
1519 void CoreSessionEventProcessor::defaultHandler(const QString& ctcpCmd, CtcpEvent* e)
1520 {
1521     // This handler is only there to avoid warnings for unknown CTCPs
1522     Q_UNUSED(e);
1523     Q_UNUSED(ctcpCmd);
1524 }
1525
1526 void CoreSessionEventProcessor::handleCtcpAction(CtcpEvent* e)
1527 {
1528     // This handler is only there to feed CLIENTINFO
1529     Q_UNUSED(e);
1530 }
1531
1532 void CoreSessionEventProcessor::handleCtcpClientinfo(CtcpEvent* e)
1533 {
1534     QStringList supportedHandlers;
1535     for (const QString& handler : providesHandlers())
1536         supportedHandlers << handler.toUpper();
1537     std::sort(supportedHandlers.begin(), supportedHandlers.end());
1538     e->setReply(supportedHandlers.join(" "));
1539 }
1540
1541 // http://www.irchelp.org/irchelp/rfc/ctcpspec.html
1542 // http://en.wikipedia.org/wiki/Direct_Client-to-Client
1543 void CoreSessionEventProcessor::handleCtcpDcc(CtcpEvent* e)
1544 {
1545     // DCC support is unfinished, experimental and potentially dangerous, so make it opt-in
1546     if (!Quassel::isOptionSet("enable-experimental-dcc")) {
1547         qInfo() << "DCC disabled, start core with --enable-experimental-dcc if you really want to try it out";
1548         return;
1549     }
1550
1551     // normal:  SEND <filename> <ip> <port> [<filesize>]
1552     // reverse: SEND <filename> <ip> 0 <filesize> <token>
1553     QStringList params = e->param().split(' ');
1554     if (params.count()) {
1555         QString cmd = params[0].toUpper();
1556         if (cmd == "SEND") {
1557             if (params.count() < 4) {
1558                 qWarning() << "Invalid DCC SEND request:" << e;  // TODO emit proper error to client
1559                 return;
1560             }
1561             QString filename = params[1];
1562             QHostAddress address;
1563             quint16 port = params[3].toUShort();
1564             quint64 size = 0;
1565             QString numIp = params[2];  // this is either IPv4 as a 32 bit value, or IPv6 (which always contains a colon)
1566             if (numIp.contains(':')) {  // IPv6
1567                 if (!address.setAddress(numIp)) {
1568                     qWarning() << "Invalid IPv6:" << numIp;
1569                     return;
1570                 }
1571             }
1572             else {
1573                 address.setAddress(numIp.toUInt());
1574             }
1575
1576             if (port == 0) {  // Reverse DCC is indicated by a 0 port
1577                 emit newEvent(new MessageEvent(Message::Error,
1578                                                e->network(),
1579                                                tr("Reverse DCC SEND not supported"),
1580                                                e->prefix(),
1581                                                e->target(),
1582                                                Message::None,
1583                                                e->timestamp()));
1584                 return;
1585             }
1586             if (port < 1024) {
1587                 qWarning() << "Privileged port requested:" << port;  // FIXME ask user if this is ok
1588             }
1589
1590             if (params.count() > 4) {  // filesize is optional
1591                 size = params[4].toULong();
1592             }
1593
1594             // TODO: check if target is the right thing to use for the partner
1595             CoreTransfer* transfer = new CoreTransfer(Transfer::Direction::Receive, e->target(), filename, address, port, size, this);
1596             coreSession()->signalProxy()->synchronize(transfer);
1597             coreSession()->transferManager()->addTransfer(transfer);
1598         }
1599         else {
1600             emit newEvent(new MessageEvent(Message::Error,
1601                                            e->network(),
1602                                            tr("DCC %1 not supported").arg(cmd),
1603                                            e->prefix(),
1604                                            e->target(),
1605                                            Message::None,
1606                                            e->timestamp()));
1607             return;
1608         }
1609     }
1610 }
1611
1612 void CoreSessionEventProcessor::handleCtcpPing(CtcpEvent* e)
1613 {
1614     e->setReply(e->param().isNull() ? "" : e->param());
1615 }
1616
1617 void CoreSessionEventProcessor::handleCtcpTime(CtcpEvent* e)
1618 {
1619     // Use the ISO standard to avoid locale-specific translated names
1620     // Include timezone offset data to show which timezone a user's in, otherwise we're providing
1621     // NTP-over-IRC with terrible accuracy.
1622     e->setReply(formatDateTimeToOffsetISO(QDateTime::currentDateTime()));
1623 }
1624
1625 void CoreSessionEventProcessor::handleCtcpVersion(CtcpEvent* e)
1626 {
1627     // Deliberately do not translate project name
1628     // Use the ISO standard to avoid locale-specific translated names
1629     // Use UTC time to provide a consistent string regardless of timezone
1630     // (Statistics tracking tools usually only group client versions by exact string matching)
1631     e->setReply(QString("Quassel IRC %1 (version date %2) -- https://www.quassel-irc.org")
1632                     .arg(Quassel::buildInfo().plainVersionString)
1633                     .arg(Quassel::buildInfo().commitDate.isEmpty()
1634                              ? "unknown"
1635                              : tryFormatUnixEpoch(Quassel::buildInfo().commitDate, Qt::DateFormat::ISODate, true)));
1636 }