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