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 #ifdef GCC3
  27 #include <ext/hash_map>
  28 #else
  29 #include <hash_map>
  30 #endif
  31 #include <map>
  32 #include <sstream>
  33 #include <vector>
  34 #include <deque>
  35 #include "connection.h"
  36 #include "users.h"
  37 #include "ctables.h"
  38 #include "globals.h"
  39 #include "modules.h"
  40 #include "dynamic.h"
  41 #include "wildcard.h"
  42 #include "message.h"
  43 #include "commands.h"
  44 #include "xline.h"
  45 #include "inspstring.h"
  46 #include "helperfuncs.h"
  47 #include "mode.h"
  48
  49 #include "modes/cmode_s.h"
  50 #include "modes/cmode_p.h"
  51
  52 extern int MODCOUNT;
  53 extern std::vector<Module*> modules;
  54 extern std::vector<ircd_module*> factory;
  55 extern InspIRCd* ServerInstance;
  56 extern ServerConfig* Config;
  57
  58 extern time_t TIME;
  59
  60 ModeHandler::ModeHandler(char modeletter, int parameters_on, int parameters_off, bool listmode, ModeType type, bool operonly) : mode(modeletter), n_params_on(parameters_on), n_params_off(parameters_off), list(listmode), m_type(type), oper(operonly)
  61 {
  62 }
  63
  64 ModeHandler::~ModeHandler()
  65 {
  66 }
  67
  68 bool ModeHandler::IsListMode()
  69 {
  70         return list;
  71 }
  72
  73 ModeType ModeHandler::GetModeType()
  74 {
  75         return m_type;
  76 }
  77
  78 bool ModeHandler::NeedsOper()
  79 {
  80         return oper;
  81 }
  82
  83 int ModeHandler::GetNumParams(bool adding)
  84 {
  85         return adding ? n_params_on : n_params_off;
  86 }
  87
  88 char ModeHandler::GetModeChar()
  89 {
  90         return mode;
  91 }
  92
  93 ModeAction ModeHandler::OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
  94 {
  95         return MODEACTION_DENY;
  96 }
  97
  98 void ModeHandler::DisplayList(userrec* user, chanrec* channel)
  99 {
 100 }
 101
 102 bool ModeHandler::CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 103 {
 104         return (ours < theirs);
 105 }
 106
 107 ModeWatcher::ModeWatcher(char modeletter, ModeType type) : mode(modeletter), m_type(type)
 108 {
 109 }
 110
 111 ModeWatcher::~ModeWatcher()
 112 {
 113 }
 114
 115 char ModeWatcher::GetModeChar()
 116 {
 117         return mode;
 118 }
 119
 120 ModeType ModeWatcher::GetModeType()
 121 {
 122         return m_type;
 123 }
 124
 125 bool ModeWatcher::BeforeMode(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding, ModeType type)
 126 {
 127         return true;
 128 }
 129
 130 void ModeWatcher::AfterMode(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter, bool adding, ModeType type)
 131 {
 132 }
 133
 134 userrec* ModeParser::SanityChecks(userrec *user,char *dest,chanrec *chan,int status)
 135 {
 136         userrec *d;
 137         if ((!user) || (!dest) || (!chan) || (!*dest))
 138         {
 139                 return NULL;
 140         }
 141         d = Find(dest);
 142         if (!d)
 143         {
 144                 WriteServ(user->fd,"401 %s %s :No such nick/channel",user->nick, dest);
 145                 return NULL;
 146         }
 147         return d;
 148 }
 149
 150 char* ModeParser::Grant(userrec *d,chanrec *chan,int MASK)
 151 {
 152         if (!chan)
 153                 return NULL;
 154
 155         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 156         {
 157                 if (((ucrec*)(*i))->channel == chan)
 158                 {
 159                         if (((ucrec*)(*i))->uc_modes & MASK)
 160                         {
 161                                 return NULL;
 162                         }
 163                         ((ucrec*)(*i))->uc_modes = ((ucrec*)(*i))->uc_modes | MASK;
 164                         switch (MASK)
 165                         {
 166                                 case UCMODE_OP:
 167                                         ((ucrec*)(*i))->channel->AddOppedUser(d);
 168                                 break;
 169                                 case UCMODE_HOP:
 170                                         ((ucrec*)(*i))->channel->AddHalfoppedUser(d);
 171                                 break;
 172                                 case UCMODE_VOICE:
 173                                         ((ucrec*)(*i))->channel->AddVoicedUser(d);
 174                                 break;
 175                         }
 176                         log(DEBUG,"grant: %s %s",((ucrec*)(*i))->channel->name,d->nick);
 177                         return d->nick;
 178                 }
 179         }
 180         return NULL;
 181 }
 182
 183 char* ModeParser::Revoke(userrec *d,chanrec *chan,int MASK)
 184 {
 185         if (!chan)
 186                 return NULL;
 187
 188         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 189         {
 190                 if (((ucrec*)(*i))->channel == chan)
 191                 {
 192                         if ((((ucrec*)(*i))->uc_modes & MASK) == 0)
 193                         {
 194                                 return NULL;
 195                         }
 196                         ((ucrec*)(*i))->uc_modes ^= MASK;
 197                         switch (MASK)
 198                         {
 199                                 case UCMODE_OP:
 200                                         ((ucrec*)(*i))->channel->DelOppedUser(d);
 201                                 break;
 202                                 case UCMODE_HOP:
 203                                         ((ucrec*)(*i))->channel->DelHalfoppedUser(d);
 204                                 break;
 205                                 case UCMODE_VOICE:
 206                                         ((ucrec*)(*i))->channel->DelVoicedUser(d);
 207                                 break;
 208                         }
 209                         log(DEBUG,"revoke: %s %s",((ucrec*)(*i))->channel->name,d->nick);
 210                         return d->nick;
 211                 }
 212         }
 213         return NULL;
 214 }
 215
 216 char* ModeParser::GiveOps(userrec *user,char *dest,chanrec *chan,int status)
 217 {
 218         userrec *d = this->SanityChecks(user,dest,chan,status);
 219
 220         if (d)
 221         {
 222                 if (IS_LOCAL(user))
 223                 {
 224                         int MOD_RESULT = 0;
 225                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_OP));
 226
 227                         if (MOD_RESULT == ACR_DENY)
 228                                 return NULL;
 229                         if (MOD_RESULT == ACR_DEFAULT)
 230                         {
 231                                 if ((status < STATUS_OP) && (!is_uline(user->server)))
 232                                 {
 233                                         WriteServ(user->fd,"482 %s %s :You're not a channel operator",user->nick, chan->name);
 234                                         return NULL;
 235                                 }
 236                         }
 237                 }
 238
 239                 return this->Grant(d,chan,UCMODE_OP);
 240         }
 241         return NULL;
 242 }
 243
 244 char* ModeParser::GiveHops(userrec *user,char *dest,chanrec *chan,int status)
 245 {
 246         userrec *d = this->SanityChecks(user,dest,chan,status);
 247
 248         if (d)
 249         {
 250                 if (IS_LOCAL(user))
 251                 {
 252                         int MOD_RESULT = 0;
 253                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_HALFOP));
 254
 255                         if (MOD_RESULT == ACR_DENY)
 256                                 return NULL;
 257                         if (MOD_RESULT == ACR_DEFAULT)
 258                         {
 259                                 if ((status < STATUS_OP) && (!is_uline(user->server)))
 260                                 {
 261                                         WriteServ(user->fd,"482 %s %s :You're not a channel operator",user->nick, chan->name);
 262                                         return NULL;
 263                                 }
 264                         }
 265                 }
 266
 267                 return this->Grant(d,chan,UCMODE_HOP);
 268         }
 269         return NULL;
 270 }
 271
 272 char* ModeParser::GiveVoice(userrec *user,char *dest,chanrec *chan,int status)
 273 {
 274         userrec *d = this->SanityChecks(user,dest,chan,status);
 275
 276         if (d)
 277         {
 278                 if (IS_LOCAL(user))
 279                 {
 280                         int MOD_RESULT = 0;
 281                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_VOICE));
 282
 283                         if (MOD_RESULT == ACR_DENY)
 284                                 return NULL;
 285                         if (MOD_RESULT == ACR_DEFAULT)
 286                         {
 287                                 if ((status < STATUS_HOP) && (!is_uline(user->server)))
 288                                 {
 289                                         WriteServ(user->fd,"482 %s %s :You must be at least a half-operator to change modes on this channel",user->nick, chan->name);
 290                                         return NULL;
 291                                 }
 292                         }
 293                 }
 294
 295                 return this->Grant(d,chan,UCMODE_VOICE);
 296         }
 297         return NULL;
 298 }
 299
 300 char* ModeParser::TakeOps(userrec *user,char *dest,chanrec *chan,int status)
 301 {
 302         userrec *d = this->SanityChecks(user,dest,chan,status);
 303
 304         if (d)
 305         {
 306                 if (IS_LOCAL(user))
 307                 {
 308                         int MOD_RESULT = 0;
 309                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEOP));
 310
 311                         if (MOD_RESULT == ACR_DENY)
 312                                 return NULL;
 313                         if (MOD_RESULT == ACR_DEFAULT)
 314                         {
 315                                 if ((status < STATUS_OP) && (!is_uline(user->server)) && (IS_LOCAL(user)))
 316                                 {
 317                                         WriteServ(user->fd,"482 %s %s :You are not a channel operator",user->nick, chan->name);
 318                                         return NULL;
 319                                 }
 320                         }
 321                 }
 322
 323                 return this->Revoke(d,chan,UCMODE_OP);
 324         }
 325         return NULL;
 326 }
 327
 328 char* ModeParser::TakeHops(userrec *user,char *dest,chanrec *chan,int status)
 329 {
 330         userrec *d = this->SanityChecks(user,dest,chan,status);
 331
 332         if (d)
 333         {
 334                 if (IS_LOCAL(user))
 335                 {
 336                         int MOD_RESULT = 0;
 337                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEHALFOP));
 338
 339                         if (MOD_RESULT == ACR_DENY)
 340                                 return NULL;
 341                         if (MOD_RESULT == ACR_DEFAULT)
 342                         {
 343                                 /* Tweak by Brain suggested by w00t, allow a halfop to dehalfop themselves */
 344                                 if ((user != d) && ((status < STATUS_OP) && (!is_uline(user->server))))
 345                                 {
 346                                         WriteServ(user->fd,"482 %s %s :You are not a channel operator",user->nick, chan->name);
 347                                         return NULL;
 348                                 }
 349                         }
 350                 }
 351
 352                 return this->Revoke(d,chan,UCMODE_HOP);
 353         }
 354         return NULL;
 355 }
 356
 357 char* ModeParser::TakeVoice(userrec *user,char *dest,chanrec *chan,int status)
 358 {
 359         userrec *d = this->SanityChecks(user,dest,chan,status);
 360
 361         if (d)
 362         {
 363                 if (IS_LOCAL(user))
 364                 {
 365                         int MOD_RESULT = 0;
 366                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEVOICE));
 367
 368                         if (MOD_RESULT == ACR_DENY)
 369                                 return NULL;
 370                         if (MOD_RESULT == ACR_DEFAULT)
 371                         {
 372                                 if ((status < STATUS_HOP) && (!is_uline(user->server)))
 373                                 {
 374                                         WriteServ(user->fd,"482 %s %s :You must be at least a half-operator to change modes on this channel",user->nick, chan->name);
 375                                         return NULL;
 376                                 }
 377                         }
 378                 }
 379
 380                 return this->Revoke(d,chan,UCMODE_VOICE);
 381         }
 382         return NULL;
 383 }
 384
 385 void ModeParser::Process(char **parameters, int pcnt, userrec *user, bool servermode)
 386 {
 387         std::string target = parameters[0];
 388         ModeType type = MODETYPE_USER;
 389         unsigned char mask = 0;
 390         chanrec* targetchannel = FindChan(parameters[0]);
 391         userrec* targetuser  = Find(parameters[0]);
 392
 393         log(DEBUG,"ModeParser::Process start");
 394
 395         if (pcnt > 1)
 396         {
 397                 if (targetchannel)
 398                 {
 399                         log(DEBUG,"Target type is CHANNEL");
 400                         type = MODETYPE_CHANNEL;
 401                         mask = MASK_CHANNEL;
 402                 }
 403                 else if (targetuser)
 404                 {
 405                         log(DEBUG,"Target type is USER");
 406                         type = MODETYPE_USER;
 407                         mask = MASK_USER;
 408                 }
 409                 else
 410                 {
 411                         /* No such nick/channel */
 412                         log(DEBUG,"Target type is UNKNOWN, bailing");
 413                         return;
 414                 }
 415                 std::string mode_sequence = parameters[1];
 416                 std::string parameter = "";
 417                 std::ostringstream parameter_list;
 418                 std::string output_sequence = "";
 419                 bool adding = true, state_change = false;
 420                 int handler_id = 0;
 421                 int parameter_counter = 2; /* Index of first parameter */
 422
 423                 for (std::string::const_iterator modeletter = mode_sequence.begin(); modeletter != mode_sequence.end(); modeletter++)
 424                 {
 425                         switch (*modeletter)
 426                         {
 427
 428                                 log(DEBUG,"Iterate mode letter %c",*modeletter);
 429
 430                                 /* NB:
 431                                  * For + and - mode characters, we don't just stick the character into the output sequence.
 432                                  * This is because the user may do something dumb, like: +-+ooo or +oo-+. To prevent this
 433                                  * appearing in the output sequence, we store a flag which says there was a state change,
 434                                  * which is set on any + or -, however, the + or - that we finish on is only appended to
 435                                  * the output stream in the event it is followed by a non "+ or -" character, such as o or v.
 436                                  */
 437                                 case '+':
 438                                         /* The following expression prevents: +o+o nick nick, compressing it to +oo nick nick,
 439                                          * however, will allow the + if it is the first item in the sequence, regardless.
 440                                          */
 441                                         if ((!adding) || (!output_sequence.length()))
 442                                                 state_change = true;
 443                                         adding = true;
 444                                         continue;
 445                                 break;
 446                                 case '-':
 447                                         if ((adding) || (!output_sequence.length()))
 448                                                 state_change = true;
 449                                         adding = false;
 450                                         continue;
 451                                 break;
 452                                 default:
 453
 454                                         /**
 455                                          * Watch carefully for the sleight of hand trick.
 456                                          * 65 is the ascii value of 'A'. We take this from
 457                                          * the char we're looking at to get a number between
 458                                          * 1 and 127. We then logic-or it to get the hashed
 459                                          * position, dependent on wether its a channel or
 460                                          * a user mode. This is a little stranger, but a lot
 461                                          * faster, than using a map of pairs.
 462                                          */
 463                                         handler_id = (*modeletter - 65) | mask;
 464
 465                                         if (modehandlers[handler_id])
 466                                         {
 467                                                 bool abort = false;
 468
 469                                                 log(DEBUG,"Found a ModeHandler* for mode %c",*modeletter);
 470
 471                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 472                                                 {
 473                                                         log(DEBUG,"Call a ModeWatcher*");
 474                                                         if ((*watchers)->BeforeMode(user, targetuser, targetchannel, parameter, adding, type) == MODEACTION_DENY)
 475                                                                 abort = true;
 476                                                 }
 477                                                 if ((modehandlers[handler_id]->GetModeType() == type) && (!abort))
 478                                                 {
 479                                                         log(DEBUG,"Modetype match, calling handler");
 480
 481                                                         if (modehandlers[handler_id]->GetNumParams(adding))
 482                                                         {
 483                                                                 log(DEBUG,"ModeHandler* for this mode says it has parameters");
 484
 485                                                                 if (pcnt < parameter_counter)
 486                                                                 {
 487                                                                         parameter = parameters[parameter_counter++];
 488                                                                 }
 489                                                                 else
 490                                                                 {
 491                                                                         parameter = "";
 492                                                                 }
 493                                                         }
 494                                                         ModeAction ma = modehandlers[handler_id]->OnModeChange(user, targetuser, targetchannel, parameter, adding);
 495                                                         if (ma == MODEACTION_ALLOW)
 496                                                         {
 497                                                                 log(DEBUG,"ModeAction was allow");
 498
 499                                                                 /* We're about to output a valid mode letter - was there previously a pending state-change? */
 500                                                                 if (state_change)
 501                                                                 {
 502                                                                         log(DEBUG,"Appending state change");
 503                                                                         output_sequence.append(adding ? "+" : "-");
 504                                                                 }
 505
 506                                                                 /* Add the mode letter */
 507                                                                 output_sequence = output_sequence + *modeletter;
 508                                                                 log(DEBUG,"Added mode letter to output sequence, sequence now: '%s'",output_sequence.c_str());
 509
 510                                                                 /* Is there a valid parameter for this mode? If so add it to the parameter list */
 511                                                                 if ((modehandlers[handler_id]->GetNumParams(adding)) && (parameter != ""))
 512                                                                 {
 513                                                                         log(DEBUG,"Added parameter to parameter_list, list now: '%s'",parameter_list.str().c_str());
 514                                                                         parameter_list << " " << parameter;
 515                                                                 }
 516
 517                                                                 /* Call all the AfterMode events in the mode watchers for this mode */
 518                                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 519                                                                 {
 520                                                                         log(DEBUG,"Called a ModeWatcher* after event");
 521                                                                         (*watchers)->AfterMode(user, targetuser, targetchannel, parameter, adding, type);
 522                                                                 }
 523
 524                                                                 /* Reset the state change flag */
 525                                                                 state_change = false;
 526                                                         }
 527                                                 }
 528                                         }
 529                                 break;
 530                         }
 531                 }
 532                 /* Was there at least one valid mode in the sequence? */
 533                 if (output_sequence != "")
 534                 {
 535                         if (servermode)
 536                         {
 537                                 if (type == MODETYPE_CHANNEL)
 538                                 {
 539                                         WriteChannelWithServ(Config->ServerName,targetchannel,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 540                                 }
 541                         }
 542                         else
 543                         {
 544                                 if (type == MODETYPE_CHANNEL)
 545                                 {
 546                                         log(DEBUG,"Write output sequence and parameters to channel: %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 547                                         WriteChannel(targetchannel,user,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 548                                         FOREACH_MOD(I_OnMode,OnMode(user, targetchannel, TYPE_CHANNEL, output_sequence + parameter_list.str()));
 549                                 }
 550                         }
 551                 }
 552         }
 553 }
 554
 555
 556 void cmd_mode::Handle (char **parameters, int pcnt, userrec *user)
 557 {
 558         if (!user)
 559                 return;
 560
 561         ServerInstance->ModeGrok->Process(parameters, pcnt, user, false);
 562
 563         return;
 564 }
 565
 566 bool ModeParser::AddMode(ModeHandler* mh, unsigned const char modeletter)
 567 {
 568         unsigned char mask = 0;
 569         unsigned char pos = 0;
 570
 571         /* Yes, i know, this might let people declare modes like '_' or '^'.
 572          * If they do that, thats their problem, and if i ever EVER see an
 573          * official InspIRCd developer do that, i'll beat them with a paddle!
 574          */
 575         if ((modeletter < 'A') || (modeletter > 'z'))
 576                 return false;
 577
 578         mh->GetModeType() == MODETYPE_USER ? mask = MASK_USER : mask = MASK_CHANNEL;
 579         pos = (modeletter-65) | mask;
 580
 581         if (modehandlers[pos])
 582                 return false;
 583
 584         modehandlers[pos] = mh;
 585         return true;
 586 }
 587
 588 ModeParser::ModeParser()
 589 {
 590         /* Clear mode list */
 591         memset(modehandlers, 0, sizeof(modehandlers));
 592         memset(modewatchers, 0, sizeof(modewatchers));
 593
 594         /* Initialise the RFC mode letters */
 595         this->AddMode(new ModeChannelSecret, 's');
 596         this->AddMode(new ModeChannelPrivate, 'p');
 597 }
 598