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