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
  51 extern int MODCOUNT;
  52 extern std::vector<Module*> modules;
  53 extern std::vector<ircd_module*> factory;
  54 extern InspIRCd* ServerInstance;
  55 extern ServerConfig* Config;
  56
  57 extern time_t TIME;
  58
  59 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)
  60 {
  61 }
  62
  63 ModeHandler::~ModeHandler()
  64 {
  65 }
  66
  67 bool ModeHandler::IsListMode()
  68 {
  69         return list;
  70 }
  71
  72 ModeType ModeHandler::GetModeType()
  73 {
  74         return m_type;
  75 }
  76
  77 bool ModeHandler::NeedsOper()
  78 {
  79         return oper;
  80 }
  81
  82 int ModeHandler::GetNumParams(bool adding)
  83 {
  84         return adding ? n_params_on : n_params_off;
  85 }
  86
  87 char ModeHandler::GetModeChar()
  88 {
  89         return mode;
  90 }
  91
  92 ModeAction ModeHandler::OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
  93 {
  94         return MODEACTION_DENY;
  95 }
  96
  97 void ModeHandler::DisplayList(userrec* user, chanrec* channel)
  98 {
  99 }
 100
 101 bool ModeHandler::CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 102 {
 103         return (ours < theirs);
 104 }
 105
 106 ModeWatcher::ModeWatcher(char modeletter, ModeType type) : mode(modeletter), m_type(type)
 107 {
 108 }
 109
 110 ModeWatcher::~ModeWatcher()
 111 {
 112 }
 113
 114 char ModeWatcher::GetModeChar()
 115 {
 116         return mode;
 117 }
 118
 119 ModeType ModeWatcher::GetModeType()
 120 {
 121         return m_type;
 122 }
 123
 124 bool ModeWatcher::BeforeMode(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding, ModeType type)
 125 {
 126         return true;
 127 }
 128
 129 void ModeWatcher::AfterMode(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter, bool adding, ModeType type)
 130 {
 131 }
 132
 133 userrec* ModeParser::SanityChecks(userrec *user,char *dest,chanrec *chan,int status)
 134 {
 135         userrec *d;
 136         if ((!user) || (!dest) || (!chan) || (!*dest))
 137         {
 138                 return NULL;
 139         }
 140         d = Find(dest);
 141         if (!d)
 142         {
 143                 WriteServ(user->fd,"401 %s %s :No such nick/channel",user->nick, dest);
 144                 return NULL;
 145         }
 146         return d;
 147 }
 148
 149 char* ModeParser::Grant(userrec *d,chanrec *chan,int MASK)
 150 {
 151         if (!chan)
 152                 return NULL;
 153
 154         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 155         {
 156                 if (((ucrec*)(*i))->channel == chan)
 157                 {
 158                         if (((ucrec*)(*i))->uc_modes & MASK)
 159                         {
 160                                 return NULL;
 161                         }
 162                         ((ucrec*)(*i))->uc_modes = ((ucrec*)(*i))->uc_modes | MASK;
 163                         switch (MASK)
 164                         {
 165                                 case UCMODE_OP:
 166                                         ((ucrec*)(*i))->channel->AddOppedUser(d);
 167                                 break;
 168                                 case UCMODE_HOP:
 169                                         ((ucrec*)(*i))->channel->AddHalfoppedUser(d);
 170                                 break;
 171                                 case UCMODE_VOICE:
 172                                         ((ucrec*)(*i))->channel->AddVoicedUser(d);
 173                                 break;
 174                         }
 175                         log(DEBUG,"grant: %s %s",((ucrec*)(*i))->channel->name,d->nick);
 176                         return d->nick;
 177                 }
 178         }
 179         return NULL;
 180 }
 181
 182 char* ModeParser::Revoke(userrec *d,chanrec *chan,int MASK)
 183 {
 184         if (!chan)
 185                 return NULL;
 186
 187         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 188         {
 189                 if (((ucrec*)(*i))->channel == chan)
 190                 {
 191                         if ((((ucrec*)(*i))->uc_modes & MASK) == 0)
 192                         {
 193                                 return NULL;
 194                         }
 195                         ((ucrec*)(*i))->uc_modes ^= MASK;
 196                         switch (MASK)
 197                         {
 198                                 case UCMODE_OP:
 199                                         ((ucrec*)(*i))->channel->DelOppedUser(d);
 200                                 break;
 201                                 case UCMODE_HOP:
 202                                         ((ucrec*)(*i))->channel->DelHalfoppedUser(d);
 203                                 break;
 204                                 case UCMODE_VOICE:
 205                                         ((ucrec*)(*i))->channel->DelVoicedUser(d);
 206                                 break;
 207                         }
 208                         log(DEBUG,"revoke: %s %s",((ucrec*)(*i))->channel->name,d->nick);
 209                         return d->nick;
 210                 }
 211         }
 212         return NULL;
 213 }
 214
 215 char* ModeParser::GiveOps(userrec *user,char *dest,chanrec *chan,int status)
 216 {
 217         userrec *d = this->SanityChecks(user,dest,chan,status);
 218
 219         if (d)
 220         {
 221                 if (IS_LOCAL(user))
 222                 {
 223                         int MOD_RESULT = 0;
 224                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_OP));
 225
 226                         if (MOD_RESULT == ACR_DENY)
 227                                 return NULL;
 228                         if (MOD_RESULT == ACR_DEFAULT)
 229                         {
 230                                 if ((status < STATUS_OP) && (!is_uline(user->server)))
 231                                 {
 232                                         WriteServ(user->fd,"482 %s %s :You're not a channel operator",user->nick, chan->name);
 233                                         return NULL;
 234                                 }
 235                         }
 236                 }
 237
 238                 return this->Grant(d,chan,UCMODE_OP);
 239         }
 240         return NULL;
 241 }
 242
 243 char* ModeParser::GiveHops(userrec *user,char *dest,chanrec *chan,int status)
 244 {
 245         userrec *d = this->SanityChecks(user,dest,chan,status);
 246
 247         if (d)
 248         {
 249                 if (IS_LOCAL(user))
 250                 {
 251                         int MOD_RESULT = 0;
 252                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_HALFOP));
 253
 254                         if (MOD_RESULT == ACR_DENY)
 255                                 return NULL;
 256                         if (MOD_RESULT == ACR_DEFAULT)
 257                         {
 258                                 if ((status < STATUS_OP) && (!is_uline(user->server)))
 259                                 {
 260                                         WriteServ(user->fd,"482 %s %s :You're not a channel operator",user->nick, chan->name);
 261                                         return NULL;
 262                                 }
 263                         }
 264                 }
 265
 266                 return this->Grant(d,chan,UCMODE_HOP);
 267         }
 268         return NULL;
 269 }
 270
 271 char* ModeParser::GiveVoice(userrec *user,char *dest,chanrec *chan,int status)
 272 {
 273         userrec *d = this->SanityChecks(user,dest,chan,status);
 274
 275         if (d)
 276         {
 277                 if (IS_LOCAL(user))
 278                 {
 279                         int MOD_RESULT = 0;
 280                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_VOICE));
 281
 282                         if (MOD_RESULT == ACR_DENY)
 283                                 return NULL;
 284                         if (MOD_RESULT == ACR_DEFAULT)
 285                         {
 286                                 if ((status < STATUS_HOP) && (!is_uline(user->server)))
 287                                 {
 288                                         WriteServ(user->fd,"482 %s %s :You must be at least a half-operator to change modes on this channel",user->nick, chan->name);
 289                                         return NULL;
 290                                 }
 291                         }
 292                 }
 293
 294                 return this->Grant(d,chan,UCMODE_VOICE);
 295         }
 296         return NULL;
 297 }
 298
 299 char* ModeParser::TakeOps(userrec *user,char *dest,chanrec *chan,int status)
 300 {
 301         userrec *d = this->SanityChecks(user,dest,chan,status);
 302
 303         if (d)
 304         {
 305                 if (IS_LOCAL(user))
 306                 {
 307                         int MOD_RESULT = 0;
 308                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEOP));
 309
 310                         if (MOD_RESULT == ACR_DENY)
 311                                 return NULL;
 312                         if (MOD_RESULT == ACR_DEFAULT)
 313                         {
 314                                 if ((status < STATUS_OP) && (!is_uline(user->server)) && (IS_LOCAL(user)))
 315                                 {
 316                                         WriteServ(user->fd,"482 %s %s :You are not a channel operator",user->nick, chan->name);
 317                                         return NULL;
 318                                 }
 319                         }
 320                 }
 321
 322                 return this->Revoke(d,chan,UCMODE_OP);
 323         }
 324         return NULL;
 325 }
 326
 327 char* ModeParser::TakeHops(userrec *user,char *dest,chanrec *chan,int status)
 328 {
 329         userrec *d = this->SanityChecks(user,dest,chan,status);
 330
 331         if (d)
 332         {
 333                 if (IS_LOCAL(user))
 334                 {
 335                         int MOD_RESULT = 0;
 336                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEHALFOP));
 337
 338                         if (MOD_RESULT == ACR_DENY)
 339                                 return NULL;
 340                         if (MOD_RESULT == ACR_DEFAULT)
 341                         {
 342                                 /* Tweak by Brain suggested by w00t, allow a halfop to dehalfop themselves */
 343                                 if ((user != d) && ((status < STATUS_OP) && (!is_uline(user->server))))
 344                                 {
 345                                         WriteServ(user->fd,"482 %s %s :You are not a channel operator",user->nick, chan->name);
 346                                         return NULL;
 347                                 }
 348                         }
 349                 }
 350
 351                 return this->Revoke(d,chan,UCMODE_HOP);
 352         }
 353         return NULL;
 354 }
 355
 356 char* ModeParser::TakeVoice(userrec *user,char *dest,chanrec *chan,int status)
 357 {
 358         userrec *d = this->SanityChecks(user,dest,chan,status);
 359
 360         if (d)
 361         {
 362                 if (IS_LOCAL(user))
 363                 {
 364                         int MOD_RESULT = 0;
 365                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(user,d,chan,AC_DEVOICE));
 366
 367                         if (MOD_RESULT == ACR_DENY)
 368                                 return NULL;
 369                         if (MOD_RESULT == ACR_DEFAULT)
 370                         {
 371                                 if ((status < STATUS_HOP) && (!is_uline(user->server)))
 372                                 {
 373                                         WriteServ(user->fd,"482 %s %s :You must be at least a half-operator to change modes on this channel",user->nick, chan->name);
 374                                         return NULL;
 375                                 }
 376                         }
 377                 }
 378
 379                 return this->Revoke(d,chan,UCMODE_VOICE);
 380         }
 381         return NULL;
 382 }
 383
 384 char* ModeParser::AddBan(userrec *user,char *dest,chanrec *chan,int status)
 385 {
 386         BanItem b;
 387         int toomanyexclamation = 0;
 388         int toomanyat = 0;
 389
 390         if ((!user) || (!dest) || (!chan) || (!*dest))
 391         {
 392                 log(DEFAULT,"*** BUG *** AddBan was given an invalid parameter");
 393                 return NULL;
 394         }
 395
 396         for (char* i = dest; *i; i++)
 397         {
 398                 if ((*i < 32) || (*i > 126))
 399                 {
 400                         return NULL;
 401                 }
 402                 else if (*i == '!')
 403                 {
 404                         toomanyexclamation++;
 405                 }
 406                 else if (*i == '@')
 407                 {
 408                         toomanyat++;
 409                 }
 410         }
 411
 412         if (toomanyexclamation != 1 || toomanyat != 1)
 413                 /*
 414                  * this stops sillyness like n!u!u!u@h, though note that most
 415                  * ircds don't actually verify banmask validity. --w00t
 416                  */
 417                 return NULL;
 418
 419         long maxbans = GetMaxBans(chan->name);
 420         if ((unsigned)chan->bans.size() > (unsigned)maxbans)
 421         {
 422                 WriteServ(user->fd,"478 %s %s :Channel ban list for %s is full (maximum entries for this channel is %d)",user->nick, chan->name,chan->name,maxbans);
 423                 return NULL;
 424         }
 425
 426         log(DEBUG,"AddBan: %s %s",chan->name,user->nick);
 427
 428         int MOD_RESULT = 0;
 429         FOREACH_RESULT(I_OnAddBan,OnAddBan(user,chan,dest));
 430         if (MOD_RESULT)
 431                 return NULL;
 432
 433         TidyBan(dest);
 434         for (BanList::iterator i = chan->bans.begin(); i != chan->bans.end(); i++)
 435         {
 436                 if (!strcasecmp(i->data,dest))
 437                 {
 438                         // dont allow a user to set the same ban twice
 439                         return NULL;
 440                 }
 441         }
 442
 443         b.set_time = TIME;
 444         strlcpy(b.data,dest,MAXBUF);
 445         if (*user->nick)
 446         {
 447                 strlcpy(b.set_by,user->nick,NICKMAX-1);
 448         }
 449         else
 450         {
 451                 strlcpy(b.set_by,Config->ServerName,NICKMAX-1);
 452         }
 453         chan->bans.push_back(b);
 454         return dest;
 455 }
 456
 457 char* ModeParser::TakeBan(userrec *user,char *dest,chanrec *chan,int status)
 458 {
 459         if ((!user) || (!dest) || (!chan) || (!*dest)) {
 460                 log(DEFAULT,"*** BUG *** TakeBan was given an invalid parameter");
 461                 return 0;
 462         }
 463
 464         log(DEBUG,"del_ban: %s %s",chan->name,user->nick);
 465         for (BanList::iterator i = chan->bans.begin(); i != chan->bans.end(); i++)
 466         {
 467                 if (!strcasecmp(i->data,dest))
 468                 {
 469                         int MOD_RESULT = 0;
 470                         FOREACH_RESULT(I_OnDelBan,OnDelBan(user,chan,dest));
 471                         if (MOD_RESULT)
 472                                 return NULL;
 473                         chan->bans.erase(i);
 474                         return dest;
 475                 }
 476         }
 477         return NULL;
 478 }
 479
 480 void ModeParser::Process(char **parameters, int pcnt, userrec *user, bool servermode)
 481 {
 482         std::string target = parameters[0];
 483         ModeType type = MODETYPE_USER;
 484         chanrec* targetchannel = FindChan(parameters[0]);
 485         userrec* targetuser  = Find(parameters[0]);
 486
 487         log(DEBUG,"ModeParser::Process start");
 488
 489         if (pcnt > 1)
 490         {
 491                 if (targetchannel)
 492                 {
 493                         log(DEBUG,"Target type is CHANNEL");
 494                         type = MODETYPE_CHANNEL;
 495                 }
 496                 else if (targetuser)
 497                 {
 498                         log(DEBUG,"Target type is USER");
 499                         type = MODETYPE_USER;
 500                 }
 501                 else
 502                 {
 503                         /* No such nick/channel */
 504                         log(DEBUG,"Target type is UNKNOWN, bailing");
 505                         return;
 506                 }
 507                 std::string mode_sequence = parameters[1];
 508                 std::string parameter = "";
 509                 std::ostringstream parameter_list;
 510                 std::string output_sequence = "";
 511                 bool adding = true, state_change = false;
 512                 int handler_id = 0;
 513                 int parameter_counter = 2; /* Index of first parameter */
 514
 515                 for (std::string::const_iterator modeletter = mode_sequence.begin(); modeletter != mode_sequence.end(); modeletter++)
 516                 {
 517                         switch (*modeletter)
 518                         {
 519
 520                                 log(DEBUG,"Iterate mode letter %c",*modeletter);
 521
 522                                 /* NB:
 523                                  * For + and - mode characters, we don't just stick the character into the output sequence.
 524                                  * This is because the user may do something dumb, like: +-+ooo or +oo-+. To prevent this
 525                                  * appearing in the output sequence, we store a flag which says there was a state change,
 526                                  * which is set on any + or -, however, the + or - that we finish on is only appended to
 527                                  * the output stream in the event it is followed by a non "+ or -" character, such as o or v.
 528                                  */
 529                                 case '+':
 530                                         /* The following expression prevents: +o+o nick nick, compressing it to +oo nick nick,
 531                                          * however, will allow the + if it is the first item in the sequence, regardless.
 532                                          */
 533                                         if ((!adding) || (!output_sequence.length()))
 534                                                 state_change = true;
 535                                         adding = true;
 536                                         continue;
 537                                 break;
 538                                 case '-':
 539                                         if ((adding) || (!output_sequence.length()))
 540                                                 state_change = true;
 541                                         adding = false;
 542                                         continue;
 543                                 break;
 544                                 default:
 545
 546                                         /* 65 is the ascii value of 'A' */
 547                                         handler_id = *modeletter - 65;
 548
 549                                         if (modehandlers[handler_id])
 550                                         {
 551                                                 bool abort = false;
 552
 553                                                 log(DEBUG,"Found a ModeHandler* for mode %c",*modeletter);
 554
 555                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 556                                                 {
 557                                                         log(DEBUG,"Call a ModeWatcher*");
 558                                                         if ((*watchers)->BeforeMode(user, targetuser, targetchannel, parameter, adding, type) == MODEACTION_DENY)
 559                                                                 abort = true;
 560                                                 }
 561                                                 if ((modehandlers[handler_id]->GetModeType() == type) && (!abort))
 562                                                 {
 563                                                         log(DEBUG,"Modetype match, calling handler");
 564
 565                                                         if (modehandlers[handler_id]->GetNumParams(adding))
 566                                                         {
 567                                                                 log(DEBUG,"ModeHandler* for this mode says it has parameters");
 568
 569                                                                 if (pcnt < parameter_counter)
 570                                                                 {
 571                                                                         parameter = parameters[parameter_counter++];
 572                                                                 }
 573                                                                 else
 574                                                                 {
 575                                                                         parameter = "";
 576                                                                 }
 577                                                         }
 578                                                         ModeAction ma = modehandlers[handler_id]->OnModeChange(user, targetuser, targetchannel, parameter, adding);
 579                                                         if (ma == MODEACTION_ALLOW)
 580                                                         {
 581                                                                 log(DEBUG,"ModeAction was allow");
 582
 583                                                                 /* We're about to output a valid mode letter - was there previously a pending state-change? */
 584                                                                 if (state_change)
 585                                                                 {
 586                                                                         log(DEBUG,"Appending state change");
 587                                                                         output_sequence.append(adding ? "+" : "-");
 588                                                                 }
 589
 590                                                                 /* Add the mode letter */
 591                                                                 output_sequence = output_sequence + *modeletter;
 592                                                                 log(DEBUG,"Added mode letter to output sequence, sequence now: '%s'",output_sequence.c_str());
 593
 594                                                                 /* Is there a valid parameter for this mode? If so add it to the parameter list */
 595                                                                 if ((modehandlers[handler_id]->GetNumParams(adding)) && (parameter != ""))
 596                                                                 {
 597                                                                         log(DEBUG,"Added parameter to parameter_list, list now: '%s'",parameter_list.str().c_str());
 598                                                                         parameter_list << " " << parameter;
 599                                                                 }
 600
 601                                                                 /* Call all the AfterMode events in the mode watchers for this mode */
 602                                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 603                                                                 {
 604                                                                         log(DEBUG,"Called a ModeWatcher* after event");
 605                                                                         (*watchers)->AfterMode(user, targetuser, targetchannel, parameter, adding, type);
 606                                                                 }
 607
 608                                                                 /* Reset the state change flag */
 609                                                                 state_change = false;
 610                                                         }
 611                                                 }
 612                                         }
 613                                 break;
 614                         }
 615                 }
 616                 /* Was there at least one valid mode in the sequence? */
 617                 if (output_sequence != "")
 618                 {
 619                         if (servermode)
 620                         {
 621                                 if (type == MODETYPE_CHANNEL)
 622                                 {
 623                                         WriteChannelWithServ(Config->ServerName,targetchannel,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 624                                 }
 625                         }
 626                         else
 627                         {
 628                                 if (type == MODETYPE_CHANNEL)
 629                                 {
 630                                         log(DEBUG,"Write output sequence and parameters to channel: %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 631                                         WriteChannel(targetchannel,user,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 632                                         FOREACH_MOD(I_OnMode,OnMode(user, targetchannel, TYPE_CHANNEL, output_sequence + parameter_list.str()));
 633                                 }
 634                         }
 635                 }
 636         }
 637 }
 638
 639
 640 void cmd_mode::Handle (char **parameters, int pcnt, userrec *user)
 641 {
 642         chanrec* chan;
 643         int MOD_RESULT;
 644         int can_change;
 645         int direction = 1;
 646         char outpars[MAXBUF];
 647         bool next_ok = true;
 648
 649         if (!user)
 650                 return;
 651
 652         ServerInstance->ModeGrok->Process(parameters, pcnt, user, false);
 653
 654         return;
 655 }
 656
 657
 658 ModeParser::ModeParser()
 659 {
 660         /* Dummy framework, XXX tidyme */
 661         ModeChannelSecret* cmode_s = new ModeChannelSecret();
 662         modehandlers[(unsigned char)'s'-65] = cmode_s;
 663 }