src/mode.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include "inspircd_config.h"
  20 #include "inspircd.h"
  21 #include "configreader.h"
  22 #include <unistd.h>
  23 #include <sys/errno.h>
  24 #include <time.h>
  25 #include <string>
  26 #include "hash_map.h"
  27 #include <map>
  28 #include <sstream>
  29 #include <vector>
  30 #include <deque>
  31 #include "connection.h"
  32 #include "users.h"
  33 #include "ctables.h"
  34 #include "globals.h"
  35 #include "modules.h"
  36 #include "dynamic.h"
  37 #include "wildcard.h"
  38 #include "message.h"
  39 #include "commands.h"
  40 #include "xline.h"
  41 #include "inspstring.h"
  42 #include "helperfuncs.h"
  43 #include "mode.h"
  44
  45 /* +s (secret) */
  46 #include "modes/cmode_s.h"
  47 /* +p (private) */
  48 #include "modes/cmode_p.h"
  49 /* +b (bans) */
  50 #include "modes/cmode_b.h"
  51 /* +m (moderated) */
  52 #include "modes/cmode_m.h"
  53 /* +t (only (half) ops can change topic) */
  54 #include "modes/cmode_t.h"
  55 /* +n (no external messages) */
  56 #include "modes/cmode_n.h"
  57 /* +i (invite only) */
  58 #include "modes/cmode_i.h"
  59
  60 extern int MODCOUNT;
  61 extern std::vector<Module*> modules;
  62 extern std::vector<ircd_module*> factory;
  63 extern InspIRCd* ServerInstance;
  64 extern ServerConfig* Config;
  65
  66 extern time_t TIME;
  67
  68 ModeHandler::ModeHandler(char modeletter, int parameters_on, int parameters_off, bool listmode, ModeType type, bool operonly)
  69         : mode(modeletter), n_params_on(parameters_on), n_params_off(parameters_off), list(listmode), m_type(type), oper(operonly)
  70 {
  71 }
  72
  73 ModeHandler::~ModeHandler()
  74 {
  75 }
  76
  77 bool ModeHandler::IsListMode()
  78 {
  79         return list;
  80 }
  81
  82 ModeType ModeHandler::GetModeType()
  83 {
  84         return m_type;
  85 }
  86
  87 bool ModeHandler::NeedsOper()
  88 {
  89         return oper;
  90 }
  91
  92 int ModeHandler::GetNumParams(bool adding)
  93 {
  94         return adding ? n_params_on : n_params_off;
  95 }
  96
  97 char ModeHandler::GetModeChar()
  98 {
  99         return mode;
 100 }
 101
 102 ModeAction ModeHandler::OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 103 {
 104         return MODEACTION_DENY;
 105 }
 106
 107 void ModeHandler::DisplayList(userrec* user, chanrec* channel)
 108 {
 109 }
 110
 111 bool ModeHandler::CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 112 {
 113         return (ours < theirs);
 114 }
 115
 116 ModeWatcher::ModeWatcher(char modeletter, ModeType type) : mode(modeletter), m_type(type)
 117 {
 118 }
 119
 120 ModeWatcher::~ModeWatcher()
 121 {
 122 }
 123
 124 char ModeWatcher::GetModeChar()
 125 {
 126         return mode;
 127 }
 128
 129 ModeType ModeWatcher::GetModeType()
 130 {
 131         return m_type;
 132 }
 133
 134 bool ModeWatcher::BeforeMode(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding, ModeType type)
 135 {
 136         return true;
 137 }
 138
 139 void ModeWatcher::AfterMode(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter, bool adding, ModeType type)
 140 {
 141 }
 142
 143 userrec* ModeParser::SanityChecks(userrec *user,char *dest,chanrec *chan,int status)
 144 {
 145         userrec *d;
 146         if ((!user) || (!dest) || (!chan) || (!*dest))
 147         {
 148                 return NULL;
 149         }
 150         d = Find(dest);
 151         if (!d)
 152         {
 153                 WriteServ(user->fd,"401 %s %s :No such nick/channel",user->nick, dest);
 154                 return NULL;
 155         }
 156         return d;
 157 }
 158
 159 char* ModeParser::Grant(userrec *d,chanrec *chan,int MASK)
 160 {
 161         if (!chan)
 162                 return NULL;
 163
 164         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 165         {
 166                 if (((ucrec*)(*i))->channel == chan)
 167                 {
 168                         if (((ucrec*)(*i))->uc_modes & MASK)
 169                         {
 170                                 return NULL;
 171                         }
 172                         ((ucrec*)(*i))->uc_modes = ((ucrec*)(*i))->uc_modes | MASK;
 173                         switch (MASK)
 174                         {
 175                                 case UCMODE_OP:
 176                                         ((ucrec*)(*i))->channel->AddOppedUser(d);
 177                                 break;
 178                                 case UCMODE_HOP:
 179                                         ((ucrec*)(*i))->channel->AddHalfoppedUser(d);
 180                                 break;
 181                                 case UCMODE_VOICE:
 182                                         ((ucrec*)(*i))->channel->AddVoicedUser(d);
 183                                 break;
 184                         }
 185                         log(DEBUG,"grant: %s %s",((ucrec*)(*i))->channel->name,d->nick);
 186                         return d->nick;
 187                 }
 188         }
 189         return NULL;
 190 }
 191
 192 char* ModeParser::Revoke(userrec *d,chanrec *chan,int MASK)
 193 {
 194         if (!chan)
 195                 return NULL;
 196
 197         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 198         {
 199                 if (((ucrec*)(*i))->channel == chan)
 200                 {
 201                         if ((((ucrec*)(*i))->uc_modes & MASK) == 0)
 202                         {
 203                                 return NULL;
 204                         }
 205                         ((ucrec*)(*i))->uc_modes ^= MASK;
 206                         switch (MASK)
 207                         {
 208                                 case UCMODE_OP:
 209                                         ((ucrec*)(*i))->channel->DelOppedUser(d);
 210                                 break;
 211                                 case UCMODE_HOP:
 212                                         ((ucrec*)(*i))->channel->DelHalfoppedUser(d);
 213                                 break;
 214                                 case UCMODE_VOICE:
 215                                         ((ucrec*)(*i))->channel->DelVoicedUser(d);
 216                                 break;
 217                         }
 218                         log(DEBUG,"revoke: %s %s",((ucrec*)(*i))->channel->name,d->nick);
 219                         return d->nick;
 220                 }
 221         }
 222         return NULL;
 223 }
 224
 225 char* ModeParser::GiveOps(userrec *user,char *dest,chanrec *chan,int status)
 226 {
 227         userrec *d = this->SanityChecks(user,dest,chan,status);
 228
 229         if (d)
 230         {
 231                 if (IS_LOCAL(user))
 232                 {
 233                         int MOD_RESULT = 0;
 234                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_OP));
 235
 236                         if (MOD_RESULT == ACR_DENY)
 237                                 return NULL;
 238                         if (MOD_RESULT == ACR_DEFAULT)
 239                         {
 240                                 if ((status < STATUS_OP) && (!is_uline(user->server)))
 241                                 {
 242                                         WriteServ(user->fd,"482 %s %s :You're not a channel operator",user->nick, chan->name);
 243                                         return NULL;
 244                                 }
 245                         }
 246                 }
 247
 248                 return this->Grant(d,chan,UCMODE_OP);
 249         }
 250         return NULL;
 251 }
 252
 253 char* ModeParser::GiveHops(userrec *user,char *dest,chanrec *chan,int status)
 254 {
 255         userrec *d = this->SanityChecks(user,dest,chan,status);
 256
 257         if (d)
 258         {
 259                 if (IS_LOCAL(user))
 260                 {
 261                         int MOD_RESULT = 0;
 262                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_HALFOP));
 263
 264                         if (MOD_RESULT == ACR_DENY)
 265                                 return NULL;
 266                         if (MOD_RESULT == ACR_DEFAULT)
 267                         {
 268                                 if ((status < STATUS_OP) && (!is_uline(user->server)))
 269                                 {
 270                                         WriteServ(user->fd,"482 %s %s :You're not a channel operator",user->nick, chan->name);
 271                                         return NULL;
 272                                 }
 273                         }
 274                 }
 275
 276                 return this->Grant(d,chan,UCMODE_HOP);
 277         }
 278         return NULL;
 279 }
 280
 281 char* ModeParser::GiveVoice(userrec *user,char *dest,chanrec *chan,int status)
 282 {
 283         userrec *d = this->SanityChecks(user,dest,chan,status);
 284
 285         if (d)
 286         {
 287                 if (IS_LOCAL(user))
 288                 {
 289                         int MOD_RESULT = 0;
 290                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_VOICE));
 291
 292                         if (MOD_RESULT == ACR_DENY)
 293                                 return NULL;
 294                         if (MOD_RESULT == ACR_DEFAULT)
 295                         {
 296                                 if ((status < STATUS_HOP) && (!is_uline(user->server)))
 297                                 {
 298                                         WriteServ(user->fd,"482 %s %s :You must be at least a half-operator to change modes on this channel",user->nick, chan->name);
 299                                         return NULL;
 300                                 }
 301                         }
 302                 }
 303
 304                 return this->Grant(d,chan,UCMODE_VOICE);
 305         }
 306         return NULL;
 307 }
 308
 309 char* ModeParser::TakeOps(userrec *user,char *dest,chanrec *chan,int status)
 310 {
 311         userrec *d = this->SanityChecks(user,dest,chan,status);
 312
 313         if (d)
 314         {
 315                 if (IS_LOCAL(user))
 316                 {
 317                         int MOD_RESULT = 0;
 318                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEOP));
 319
 320                         if (MOD_RESULT == ACR_DENY)
 321                                 return NULL;
 322                         if (MOD_RESULT == ACR_DEFAULT)
 323                         {
 324                                 if ((status < STATUS_OP) && (!is_uline(user->server)) && (IS_LOCAL(user)))
 325                                 {
 326                                         WriteServ(user->fd,"482 %s %s :You are not a channel operator",user->nick, chan->name);
 327                                         return NULL;
 328                                 }
 329                         }
 330                 }
 331
 332                 return this->Revoke(d,chan,UCMODE_OP);
 333         }
 334         return NULL;
 335 }
 336
 337 char* ModeParser::TakeHops(userrec *user,char *dest,chanrec *chan,int status)
 338 {
 339         userrec *d = this->SanityChecks(user,dest,chan,status);
 340
 341         if (d)
 342         {
 343                 if (IS_LOCAL(user))
 344                 {
 345                         int MOD_RESULT = 0;
 346                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEHALFOP));
 347
 348                         if (MOD_RESULT == ACR_DENY)
 349                                 return NULL;
 350                         if (MOD_RESULT == ACR_DEFAULT)
 351                         {
 352                                 /* Tweak by Brain suggested by w00t, allow a halfop to dehalfop themselves */
 353                                 if ((user != d) && ((status < STATUS_OP) && (!is_uline(user->server))))
 354                                 {
 355                                         WriteServ(user->fd,"482 %s %s :You are not a channel operator",user->nick, chan->name);
 356                                         return NULL;
 357                                 }
 358                         }
 359                 }
 360
 361                 return this->Revoke(d,chan,UCMODE_HOP);
 362         }
 363         return NULL;
 364 }
 365
 366 char* ModeParser::TakeVoice(userrec *user,char *dest,chanrec *chan,int status)
 367 {
 368         userrec *d = this->SanityChecks(user,dest,chan,status);
 369
 370         if (d)
 371         {
 372                 if (IS_LOCAL(user))
 373                 {
 374                         int MOD_RESULT = 0;
 375                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEVOICE));
 376
 377                         if (MOD_RESULT == ACR_DENY)
 378                                 return NULL;
 379                         if (MOD_RESULT == ACR_DEFAULT)
 380                         {
 381                                 if ((status < STATUS_HOP) && (!is_uline(user->server)))
 382                                 {
 383                                         WriteServ(user->fd,"482 %s %s :You must be at least a half-operator to change modes on this channel",user->nick, chan->name);
 384                                         return NULL;
 385                                 }
 386                         }
 387                 }
 388
 389                 return this->Revoke(d,chan,UCMODE_VOICE);
 390         }
 391         return NULL;
 392 }
 393
 394 void ModeParser::Process(char **parameters, int pcnt, userrec *user, bool servermode)
 395 {
 396         std::string target = parameters[0];
 397         ModeType type = MODETYPE_USER;
 398         unsigned char mask = 0;
 399         chanrec* targetchannel = FindChan(parameters[0]);
 400         userrec* targetuser  = Find(parameters[0]);
 401
 402         log(DEBUG,"ModeParser::Process start");
 403
 404         if (pcnt > 1)
 405         {
 406                 if (targetchannel)
 407                 {
 408                         log(DEBUG,"Target type is CHANNEL");
 409                         type = MODETYPE_CHANNEL;
 410                         mask = MASK_CHANNEL;
 411                 }
 412                 else if (targetuser)
 413                 {
 414                         log(DEBUG,"Target type is USER");
 415                         type = MODETYPE_USER;
 416                         mask = MASK_USER;
 417                 }
 418                 else
 419                 {
 420                         /* No such nick/channel */
 421                         log(DEBUG,"Target type is UNKNOWN, bailing");
 422                         return;
 423                 }
 424                 std::string mode_sequence = parameters[1];
 425                 std::string parameter = "";
 426                 std::ostringstream parameter_list;
 427                 std::string output_sequence = "";
 428                 bool adding = true, state_change = false;
 429                 int handler_id = 0;
 430                 int parameter_counter = 2; /* Index of first parameter */
 431
 432                 for (std::string::const_iterator letter = mode_sequence.begin(); letter != mode_sequence.end(); letter++)
 433                 {
 434                         unsigned char modechar = *letter;
 435
 436                         switch (modechar)
 437                         {
 438
 439                                 log(DEBUG,"Iterate mode letter %c",modechar);
 440
 441                                 /* NB:
 442                                  * For + and - mode characters, we don't just stick the character into the output sequence.
 443                                  * This is because the user may do something dumb, like: +-+ooo or +oo-+. To prevent this
 444                                  * appearing in the output sequence, we store a flag which says there was a state change,
 445                                  * which is set on any + or -, however, the + or - that we finish on is only appended to
 446                                  * the output stream in the event it is followed by a non "+ or -" character, such as o or v.
 447                                  */
 448                                 case '+':
 449                                         /* The following expression prevents: +o+o nick nick, compressing it to +oo nick nick,
 450                                          * however, will allow the + if it is the first item in the sequence, regardless.
 451                                          */
 452                                         if ((!adding) || (!output_sequence.length()))
 453                                                 state_change = true;
 454                                         adding = true;
 455                                         continue;
 456                                 break;
 457                                 case '-':
 458                                         if ((adding) || (!output_sequence.length()))
 459                                                 state_change = true;
 460                                         adding = false;
 461                                         continue;
 462                                 break;
 463                                 default:
 464
 465                                         /**
 466                                          * Watch carefully for the sleight of hand trick.
 467                                          * 65 is the ascii value of 'A'. We take this from
 468                                          * the char we're looking at to get a number between
 469                                          * 1 and 127. We then logic-or it to get the hashed
 470                                          * position, dependent on wether its a channel or
 471                                          * a user mode. This is a little stranger, but a lot
 472                                          * faster, than using a map of pairs.
 473                                          */
 474                                         handler_id = (modechar - 65) | mask;
 475
 476                                         if (modehandlers[handler_id])
 477                                         {
 478                                                 bool abort = false;
 479
 480                                                 log(DEBUG,"Found a ModeHandler* for mode %c",modechar);
 481
 482                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 483                                                 {
 484                                                         log(DEBUG,"Call a ModeWatcher*");
 485                                                         if ((*watchers)->BeforeMode(user, targetuser, targetchannel, parameter, adding, type) == MODEACTION_DENY)
 486                                                                 abort = true;
 487                                                 }
 488                                                 if ((modehandlers[handler_id]->GetModeType() == type) && (!abort))
 489                                                 {
 490                                                         log(DEBUG,"Modetype match, calling handler");
 491
 492                                                         if (modehandlers[handler_id]->GetNumParams(adding))
 493                                                         {
 494                                                                 log(DEBUG,"ModeHandler* for this mode says it has parameters. pcnt=%d parameter_counter=%d",pcnt,parameter_counter);
 495
 496                                                                 if (parameter_counter < pcnt)
 497                                                                 {
 498                                                                         parameter = parameters[parameter_counter++];
 499                                                                 }
 500                                                                 else
 501                                                                 {
 502                                                                         /* No parameter, continue to the next mode */
 503                                                                         continue;
 504                                                                 }
 505                                                         }
 506                                                         ModeAction ma = modehandlers[handler_id]->OnModeChange(user, targetuser, targetchannel, parameter, adding);
 507
 508                                                         if ((modehandlers[handler_id]->GetNumParams(adding)) && (parameter == ""))
 509                                                         {
 510                                                                 /* The handler nuked the parameter and they are supposed to have one.
 511                                                                  * We CANT continue now, even if they actually returned MODEACTION_ALLOW,
 512                                                                  * so we bail to the next mode character.
 513                                                                  */
 514                                                                 continue;
 515                                                         }
 516
 517                                                         if (ma == MODEACTION_ALLOW)
 518                                                         {
 519                                                                 log(DEBUG,"ModeAction was allow");
 520
 521                                                                 /* We're about to output a valid mode letter - was there previously a pending state-change? */
 522                                                                 if (state_change)
 523                                                                 {
 524                                                                         log(DEBUG,"Appending state change");
 525                                                                         output_sequence.append(adding ? "+" : "-");
 526                                                                 }
 527
 528                                                                 /* Add the mode letter */
 529                                                                 output_sequence.push_back(modechar);
 530                                                                 log(DEBUG,"Added mode letter to output sequence, sequence now: '%s'",output_sequence.c_str());
 531
 532                                                                 /* Is there a valid parameter for this mode? If so add it to the parameter list */
 533                                                                 if ((modehandlers[handler_id]->GetNumParams(adding)) && (parameter != ""))
 534                                                                 {
 535                                                                         log(DEBUG,"Added parameter to parameter_list, list now: '%s'",parameter_list.str().c_str());
 536                                                                         parameter_list << " " << parameter;
 537                                                                 }
 538
 539                                                                 /* Call all the AfterMode events in the mode watchers for this mode */
 540                                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 541                                                                 {
 542                                                                         log(DEBUG,"Called a ModeWatcher* after event");
 543                                                                         (*watchers)->AfterMode(user, targetuser, targetchannel, parameter, adding, type);
 544                                                                 }
 545
 546                                                                 /* Reset the state change flag */
 547                                                                 state_change = false;
 548                                                         }
 549                                                 }
 550                                         }
 551                                 break;
 552                         }
 553                 }
 554                 /* Was there at least one valid mode in the sequence? */
 555                 if (output_sequence != "")
 556                 {
 557                         if (servermode)
 558                         {
 559                                 if (type == MODETYPE_CHANNEL)
 560                                 {
 561                                         WriteChannelWithServ(Config->ServerName,targetchannel,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 562                                 }
 563                         }
 564                         else
 565                         {
 566                                 if (type == MODETYPE_CHANNEL)
 567                                 {
 568                                         log(DEBUG,"Write output sequence and parameters to channel: %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 569                                         WriteChannel(targetchannel,user,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 570                                         FOREACH_MOD(I_OnMode,OnMode(user, targetchannel, TYPE_CHANNEL, output_sequence + parameter_list.str()));
 571                                 }
 572                         }
 573                 }
 574         }
 575 }
 576
 577
 578 void cmd_mode::Handle (char **parameters, int pcnt, userrec *user)
 579 {
 580         if (!user)
 581                 return;
 582
 583         ServerInstance->ModeGrok->Process(parameters, pcnt, user, false);
 584
 585         return;
 586 }
 587
 588 void ModeParser::CleanMask(std::string &mask)
 589 {
 590         std::string::size_type pos_of_pling = mask.find_first_of('!');
 591         std::string::size_type pos_of_at = mask.find_first_of('@');
 592         std::string::size_type pos_of_dot = mask.find_first_of('.');
 593         std::string::size_type pos_of_colon = mask.find_first_of(':'); /* Because ipv6 addresses are colon delimited */
 594
 595         if ((pos_of_pling == std::string::npos) && (pos_of_at == std::string::npos))
 596         {
 597                 /* Just a nick, or just a host */
 598                 if ((pos_of_dot == std::string::npos) && (pos_of_colon == std::string::npos))
 599                 {
 600                         /* It has no '.' in it, it must be a nick. */
 601                         mask.append("!*@*");
 602                 }
 603                 else
 604                 {
 605                         /* Got a dot in it? Has to be a host */
 606                         mask = "*!*@" + mask;
 607                 }
 608         }
 609         else if ((pos_of_pling == std::string::npos) && (pos_of_at != std::string::npos))
 610         {
 611                 /* Has an @ but no !, its a user@host */
 612                  mask = "*!" + mask;
 613         }
 614         else if ((pos_of_pling != std::string::npos) && (pos_of_at == std::string::npos))
 615         {
 616                 /* Has a ! but no @, it must be a nick!ident */
 617                 mask.append("@*");
 618         }
 619 }
 620
 621 bool ModeParser::AddMode(ModeHandler* mh, unsigned const char modeletter)
 622 {
 623         unsigned char mask = 0;
 624         unsigned char pos = 0;
 625
 626         /* Yes, i know, this might let people declare modes like '_' or '^'.
 627          * If they do that, thats their problem, and if i ever EVER see an
 628          * official InspIRCd developer do that, i'll beat them with a paddle!
 629          */
 630         if ((modeletter < 'A') || (modeletter > 'z'))
 631                 return false;
 632
 633         mh->GetModeType() == MODETYPE_USER ? mask = MASK_USER : mask = MASK_CHANNEL;
 634         pos = (modeletter-65) | mask;
 635
 636         if (modehandlers[pos])
 637                 return false;
 638
 639         modehandlers[pos] = mh;
 640         log(DEBUG,"ModeParser::AddMode: added mode %c",modeletter);
 641         return true;
 642 }
 643
 644 ModeParser::ModeParser()
 645 {
 646         /* Clear mode list */
 647         memset(modehandlers, 0, sizeof(modehandlers));
 648         memset(modewatchers, 0, sizeof(modewatchers));
 649
 650         /* Initialise the RFC mode letters */
 651         this->AddMode(new ModeChannelSecret, 's');
 652         this->AddMode(new ModeChannelPrivate, 'p');
 653         this->AddMode(new ModeChannelBan, 'b');
 654         this->AddMode(new ModeChannelModerated, 'm');
 655         this->AddMode(new ModeChannelTopicOps, 't');
 656         this->AddMode(new ModeChannelNoExternal, 'n');
 657         this->AddMode(new ModeChannelInviteOnly, 'i');
 658 }
 659