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
  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,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 char* ModeParser::Grant(userrec *d,chanrec *chan,int MASK)
 154 {
 155         if (!chan)
 156                 return NULL;
 157
 158         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 159         {
 160                 if (((ucrec*)(*i))->channel == chan)
 161                 {
 162                         if (((ucrec*)(*i))->uc_modes & MASK)
 163                         {
 164                                 return NULL;
 165                         }
 166                         ((ucrec*)(*i))->uc_modes = ((ucrec*)(*i))->uc_modes | MASK;
 167                         switch (MASK)
 168                         {
 169                                 case UCMODE_OP:
 170                                         ((ucrec*)(*i))->channel->AddOppedUser(d);
 171                                 break;
 172                                 case UCMODE_HOP:
 173                                         ((ucrec*)(*i))->channel->AddHalfoppedUser(d);
 174                                 break;
 175                                 case UCMODE_VOICE:
 176                                         ((ucrec*)(*i))->channel->AddVoicedUser(d);
 177                                 break;
 178                         }
 179                         log(DEBUG,"grant: %s %s",((ucrec*)(*i))->channel->name,d->nick);
 180                         return d->nick;
 181                 }
 182         }
 183         return NULL;
 184 }
 185
 186 char* ModeParser::Revoke(userrec *d,chanrec *chan,int MASK)
 187 {
 188         if (!chan)
 189                 return NULL;
 190
 191         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 192         {
 193                 if (((ucrec*)(*i))->channel == chan)
 194                 {
 195                         if ((((ucrec*)(*i))->uc_modes & MASK) == 0)
 196                         {
 197                                 return NULL;
 198                         }
 199                         ((ucrec*)(*i))->uc_modes ^= MASK;
 200                         switch (MASK)
 201                         {
 202                                 case UCMODE_OP:
 203                                         ((ucrec*)(*i))->channel->DelOppedUser(d);
 204                                 break;
 205                                 case UCMODE_HOP:
 206                                         ((ucrec*)(*i))->channel->DelHalfoppedUser(d);
 207                                 break;
 208                                 case UCMODE_VOICE:
 209                                         ((ucrec*)(*i))->channel->DelVoicedUser(d);
 210                                 break;
 211                         }
 212                         log(DEBUG,"revoke: %s %s",((ucrec*)(*i))->channel->name,d->nick);
 213                         return d->nick;
 214                 }
 215         }
 216         return NULL;
 217 }
 218
 219 char* ModeParser::GiveOps(userrec *user,char *dest,chanrec *chan,int status)
 220 {
 221         userrec *d = this->SanityChecks(user,dest,chan,status);
 222
 223         if (d)
 224         {
 225                 if (IS_LOCAL(user))
 226                 {
 227                         int MOD_RESULT = 0;
 228                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_OP));
 229
 230                         if (MOD_RESULT == ACR_DENY)
 231                                 return NULL;
 232                         if (MOD_RESULT == ACR_DEFAULT)
 233                         {
 234                                 if ((status < STATUS_OP) && (!is_uline(user->server)))
 235                                 {
 236                                         WriteServ(user->fd,"482 %s %s :You're not a channel operator",user->nick, chan->name);
 237                                         return NULL;
 238                                 }
 239                         }
 240                 }
 241
 242                 return this->Grant(d,chan,UCMODE_OP);
 243         }
 244         return NULL;
 245 }
 246
 247 char* ModeParser::GiveHops(userrec *user,char *dest,chanrec *chan,int status)
 248 {
 249         userrec *d = this->SanityChecks(user,dest,chan,status);
 250
 251         if (d)
 252         {
 253                 if (IS_LOCAL(user))
 254                 {
 255                         int MOD_RESULT = 0;
 256                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_HALFOP));
 257
 258                         if (MOD_RESULT == ACR_DENY)
 259                                 return NULL;
 260                         if (MOD_RESULT == ACR_DEFAULT)
 261                         {
 262                                 if ((status < STATUS_OP) && (!is_uline(user->server)))
 263                                 {
 264                                         WriteServ(user->fd,"482 %s %s :You're not a channel operator",user->nick, chan->name);
 265                                         return NULL;
 266                                 }
 267                         }
 268                 }
 269
 270                 return this->Grant(d,chan,UCMODE_HOP);
 271         }
 272         return NULL;
 273 }
 274
 275 char* ModeParser::GiveVoice(userrec *user,char *dest,chanrec *chan,int status)
 276 {
 277         userrec *d = this->SanityChecks(user,dest,chan,status);
 278
 279         if (d)
 280         {
 281                 if (IS_LOCAL(user))
 282                 {
 283                         int MOD_RESULT = 0;
 284                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_VOICE));
 285
 286                         if (MOD_RESULT == ACR_DENY)
 287                                 return NULL;
 288                         if (MOD_RESULT == ACR_DEFAULT)
 289                         {
 290                                 if ((status < STATUS_HOP) && (!is_uline(user->server)))
 291                                 {
 292                                         WriteServ(user->fd,"482 %s %s :You must be at least a half-operator to change modes on this channel",user->nick, chan->name);
 293                                         return NULL;
 294                                 }
 295                         }
 296                 }
 297
 298                 return this->Grant(d,chan,UCMODE_VOICE);
 299         }
 300         return NULL;
 301 }
 302
 303 char* ModeParser::TakeOps(userrec *user,char *dest,chanrec *chan,int status)
 304 {
 305         userrec *d = this->SanityChecks(user,dest,chan,status);
 306
 307         if (d)
 308         {
 309                 if (IS_LOCAL(user))
 310                 {
 311                         int MOD_RESULT = 0;
 312                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEOP));
 313
 314                         if (MOD_RESULT == ACR_DENY)
 315                                 return NULL;
 316                         if (MOD_RESULT == ACR_DEFAULT)
 317                         {
 318                                 if ((status < STATUS_OP) && (!is_uline(user->server)) && (IS_LOCAL(user)))
 319                                 {
 320                                         WriteServ(user->fd,"482 %s %s :You are not a channel operator",user->nick, chan->name);
 321                                         return NULL;
 322                                 }
 323                         }
 324                 }
 325
 326                 return this->Revoke(d,chan,UCMODE_OP);
 327         }
 328         return NULL;
 329 }
 330
 331 char* ModeParser::TakeHops(userrec *user,char *dest,chanrec *chan,int status)
 332 {
 333         userrec *d = this->SanityChecks(user,dest,chan,status);
 334
 335         if (d)
 336         {
 337                 if (IS_LOCAL(user))
 338                 {
 339                         int MOD_RESULT = 0;
 340                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEHALFOP));
 341
 342                         if (MOD_RESULT == ACR_DENY)
 343                                 return NULL;
 344                         if (MOD_RESULT == ACR_DEFAULT)
 345                         {
 346                                 /* Tweak by Brain suggested by w00t, allow a halfop to dehalfop themselves */
 347                                 if ((user != d) && ((status < STATUS_OP) && (!is_uline(user->server))))
 348                                 {
 349                                         WriteServ(user->fd,"482 %s %s :You are not a channel operator",user->nick, chan->name);
 350                                         return NULL;
 351                                 }
 352                         }
 353                 }
 354
 355                 return this->Revoke(d,chan,UCMODE_HOP);
 356         }
 357         return NULL;
 358 }
 359
 360 char* ModeParser::TakeVoice(userrec *user,char *dest,chanrec *chan,int status)
 361 {
 362         userrec *d = this->SanityChecks(user,dest,chan,status);
 363
 364         if (d)
 365         {
 366                 if (IS_LOCAL(user))
 367                 {
 368                         int MOD_RESULT = 0;
 369                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEVOICE));
 370
 371                         if (MOD_RESULT == ACR_DENY)
 372                                 return NULL;
 373                         if (MOD_RESULT == ACR_DEFAULT)
 374                         {
 375                                 if ((status < STATUS_HOP) && (!is_uline(user->server)))
 376                                 {
 377                                         WriteServ(user->fd,"482 %s %s :You must be at least a half-operator to change modes on this channel",user->nick, chan->name);
 378                                         return NULL;
 379                                 }
 380                         }
 381                 }
 382
 383                 return this->Revoke(d,chan,UCMODE_VOICE);
 384         }
 385         return NULL;
 386 }
 387
 388 void ModeParser::Process(char **parameters, int pcnt, userrec *user, bool servermode)
 389 {
 390         std::string target = parameters[0];
 391         ModeType type = MODETYPE_USER;
 392         unsigned char mask = 0;
 393         chanrec* targetchannel = FindChan(parameters[0]);
 394         userrec* targetuser  = Find(parameters[0]);
 395
 396         log(DEBUG,"ModeParser::Process start");
 397
 398         if (pcnt > 1)
 399         {
 400                 if (targetchannel)
 401                 {
 402                         log(DEBUG,"Target type is CHANNEL");
 403                         type = MODETYPE_CHANNEL;
 404                         mask = MASK_CHANNEL;
 405                 }
 406                 else if (targetuser)
 407                 {
 408                         log(DEBUG,"Target type is USER");
 409                         type = MODETYPE_USER;
 410                         mask = MASK_USER;
 411                 }
 412                 else
 413                 {
 414                         /* No such nick/channel */
 415                         log(DEBUG,"Target type is UNKNOWN, bailing");
 416                         return;
 417                 }
 418                 std::string mode_sequence = parameters[1];
 419                 std::string parameter = "";
 420                 std::ostringstream parameter_list;
 421                 std::string output_sequence = "";
 422                 bool adding = true, state_change = false;
 423                 int handler_id = 0;
 424                 int parameter_counter = 2; /* Index of first parameter */
 425
 426                 for (std::string::const_iterator modeletter = mode_sequence.begin(); modeletter != mode_sequence.end(); modeletter++)
 427                 {
 428                         switch (*modeletter)
 429                         {
 430
 431                                 log(DEBUG,"Iterate mode letter %c",*modeletter);
 432
 433                                 /* NB:
 434                                  * For + and - mode characters, we don't just stick the character into the output sequence.
 435                                  * This is because the user may do something dumb, like: +-+ooo or +oo-+. To prevent this
 436                                  * appearing in the output sequence, we store a flag which says there was a state change,
 437                                  * which is set on any + or -, however, the + or - that we finish on is only appended to
 438                                  * the output stream in the event it is followed by a non "+ or -" character, such as o or v.
 439                                  */
 440                                 case '+':
 441                                         /* The following expression prevents: +o+o nick nick, compressing it to +oo nick nick,
 442                                          * however, will allow the + if it is the first item in the sequence, regardless.
 443                                          */
 444                                         if ((!adding) || (!output_sequence.length()))
 445                                                 state_change = true;
 446                                         adding = true;
 447                                         continue;
 448                                 break;
 449                                 case '-':
 450                                         if ((adding) || (!output_sequence.length()))
 451                                                 state_change = true;
 452                                         adding = false;
 453                                         continue;
 454                                 break;
 455                                 default:
 456
 457                                         /**
 458                                          * Watch carefully for the sleight of hand trick.
 459                                          * 65 is the ascii value of 'A'. We take this from
 460                                          * the char we're looking at to get a number between
 461                                          * 1 and 127. We then logic-or it to get the hashed
 462                                          * position, dependent on wether its a channel or
 463                                          * a user mode. This is a little stranger, but a lot
 464                                          * faster, than using a map of pairs.
 465                                          */
 466                                         handler_id = (*modeletter - 65) | mask;
 467
 468                                         if (modehandlers[handler_id])
 469                                         {
 470                                                 bool abort = false;
 471
 472                                                 log(DEBUG,"Found a ModeHandler* for mode %c",*modeletter);
 473
 474                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 475                                                 {
 476                                                         log(DEBUG,"Call a ModeWatcher*");
 477                                                         if ((*watchers)->BeforeMode(user, targetuser, targetchannel, parameter, adding, type) == MODEACTION_DENY)
 478                                                                 abort = true;
 479                                                 }
 480                                                 if ((modehandlers[handler_id]->GetModeType() == type) && (!abort))
 481                                                 {
 482                                                         log(DEBUG,"Modetype match, calling handler");
 483
 484                                                         if (modehandlers[handler_id]->GetNumParams(adding))
 485                                                         {
 486                                                                 log(DEBUG,"ModeHandler* for this mode says it has parameters. pcnt=%d parameter_counter=%d",pcnt,parameter_counter);
 487
 488                                                                 if (parameter_counter < pcnt)
 489                                                                 {
 490                                                                         parameter = parameters[parameter_counter++];
 491                                                                 }
 492                                                                 else
 493                                                                 {
 494                                                                         /* No parameter, continue to the next mode */
 495                                                                         continue;
 496                                                                 }
 497                                                         }
 498                                                         ModeAction ma = modehandlers[handler_id]->OnModeChange(user, targetuser, targetchannel, parameter, adding);
 499                                                         if (ma == MODEACTION_ALLOW)
 500                                                         {
 501                                                                 log(DEBUG,"ModeAction was allow");
 502
 503                                                                 /* We're about to output a valid mode letter - was there previously a pending state-change? */
 504                                                                 if (state_change)
 505                                                                 {
 506                                                                         log(DEBUG,"Appending state change");
 507                                                                         output_sequence.append(adding ? "+" : "-");
 508                                                                 }
 509
 510                                                                 /* Add the mode letter */
 511                                                                 output_sequence = output_sequence + *modeletter;
 512                                                                 log(DEBUG,"Added mode letter to output sequence, sequence now: '%s'",output_sequence.c_str());
 513
 514                                                                 /* Is there a valid parameter for this mode? If so add it to the parameter list */
 515                                                                 if ((modehandlers[handler_id]->GetNumParams(adding)) && (parameter != ""))
 516                                                                 {
 517                                                                         log(DEBUG,"Added parameter to parameter_list, list now: '%s'",parameter_list.str().c_str());
 518                                                                         parameter_list << " " << parameter;
 519                                                                 }
 520
 521                                                                 /* Call all the AfterMode events in the mode watchers for this mode */
 522                                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 523                                                                 {
 524                                                                         log(DEBUG,"Called a ModeWatcher* after event");
 525                                                                         (*watchers)->AfterMode(user, targetuser, targetchannel, parameter, adding, type);
 526                                                                 }
 527
 528                                                                 /* Reset the state change flag */
 529                                                                 state_change = false;
 530                                                         }
 531                                                 }
 532                                         }
 533                                 break;
 534                         }
 535                 }
 536                 /* Was there at least one valid mode in the sequence? */
 537                 if (output_sequence != "")
 538                 {
 539                         if (servermode)
 540                         {
 541                                 if (type == MODETYPE_CHANNEL)
 542                                 {
 543                                         WriteChannelWithServ(Config->ServerName,targetchannel,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 544                                 }
 545                         }
 546                         else
 547                         {
 548                                 if (type == MODETYPE_CHANNEL)
 549                                 {
 550                                         log(DEBUG,"Write output sequence and parameters to channel: %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 551                                         WriteChannel(targetchannel,user,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 552                                         FOREACH_MOD(I_OnMode,OnMode(user, targetchannel, TYPE_CHANNEL, output_sequence + parameter_list.str()));
 553                                 }
 554                         }
 555                 }
 556         }
 557 }
 558
 559
 560 void cmd_mode::Handle (char **parameters, int pcnt, userrec *user)
 561 {
 562         if (!user)
 563                 return;
 564
 565         ServerInstance->ModeGrok->Process(parameters, pcnt, user, false);
 566
 567         return;
 568 }
 569
 570 void ModeParser::CleanMask(std::string &mask)
 571 {
 572         std::string::size_type pos_of_pling = mask.find_first_of('!');
 573         std::string::size_type pos_of_at = mask.find_first_of('@');
 574         std::string::size_type pos_of_dot = mask.find_first_of('.');
 575         std::string::size_type pos_of_colon = mask.find_first_of(':'); /* Because ipv6 addresses are colon delimited */
 576
 577         if ((pos_of_pling == std::string::npos) && (pos_of_at == std::string::npos))
 578         {
 579                 /* Just a nick, or just a host */
 580                 if ((pos_of_dot == std::string::npos) && (pos_of_colon == std::string::npos))
 581                 {
 582                         /* It has no '.' in it, it must be a nick. */
 583                         mask.append("!*@*");
 584                 }
 585                 else
 586                 {
 587                         /* Got a dot in it? Has to be a host */
 588                         mask = "*!*@" + mask;
 589                 }
 590         }
 591         else if ((pos_of_pling == std::string::npos) && (pos_of_at != std::string::npos))
 592         {
 593                 /* Has an @ but no !, its a user@host */
 594                  mask = "*!" + mask;
 595         }
 596         else if ((pos_of_pling != std::string::npos) && (pos_of_at == std::string::npos))
 597         {
 598                 /* Has a ! but no @, it must be a nick!ident */
 599                 mask.append("@*");
 600         }
 601
 602         /* Check for dumb stuff like *@*!*
 603          * swap the two items over so that at least the n!u@h ordering
 604          * is correct even if the elements may not be
 605          */
 606         if (((pos_of_pling != std::string::npos) && (pos_of_at != std::string::npos)) && (pos_of_pling > pos_of_at))
 607         {
 608                 mask.replace(pos_of_pling, 1, "@");
 609                 mask.replace(pos_of_at, 1, "!");
 610         }
 611 }
 612
 613 bool ModeParser::AddMode(ModeHandler* mh, unsigned const char modeletter)
 614 {
 615         unsigned char mask = 0;
 616         unsigned char pos = 0;
 617
 618         /* Yes, i know, this might let people declare modes like '_' or '^'.
 619          * If they do that, thats their problem, and if i ever EVER see an
 620          * official InspIRCd developer do that, i'll beat them with a paddle!
 621          */
 622         if ((modeletter < 'A') || (modeletter > 'z'))
 623                 return false;
 624
 625         mh->GetModeType() == MODETYPE_USER ? mask = MASK_USER : mask = MASK_CHANNEL;
 626         pos = (modeletter-65) | mask;
 627
 628         if (modehandlers[pos])
 629                 return false;
 630
 631         modehandlers[pos] = mh;
 632         log(DEBUG,"ModeParser::AddMode: added mode %c",modeletter);
 633         return true;
 634 }
 635
 636 ModeParser::ModeParser()
 637 {
 638         /* Clear mode list */
 639         memset(modehandlers, 0, sizeof(modehandlers));
 640         memset(modewatchers, 0, sizeof(modewatchers));
 641
 642         /* Initialise the RFC mode letters */
 643         this->AddMode(new ModeChannelSecret, 's');
 644         this->AddMode(new ModeChannelPrivate, 'p');
 645         this->AddMode(new ModeChannelBan, 'b');
 646         this->AddMode(new ModeChannelModerated, 'm');
 647 }
 648