src/mode.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include "inspircd_config.h"
  20 #include "inspircd.h"
  21 #include "configreader.h"
  22 #include <unistd.h>
  23 #include "hash_map.h"
  24 #include "connection.h"
  25 #include "users.h"
  26 #include "modules.h"
  27 #include "message.h"
  28 #include "inspstring.h"
  29 #include "helperfuncs.h"
  30 #include "commands.h"
  31 #include "mode.h"
  32
  33 /* +s (secret) */
  34 #include "modes/cmode_s.h"
  35 /* +p (private) */
  36 #include "modes/cmode_p.h"
  37 /* +b (bans) */
  38 #include "modes/cmode_b.h"
  39 /* +m (moderated) */
  40 #include "modes/cmode_m.h"
  41 /* +t (only (half) ops can change topic) */
  42 #include "modes/cmode_t.h"
  43 /* +n (no external messages) */
  44 #include "modes/cmode_n.h"
  45 /* +i (invite only) */
  46 #include "modes/cmode_i.h"
  47 /* +k (keyed channel) */
  48 #include "modes/cmode_k.h"
  49 /* +l (channel user limit) */
  50 #include "modes/cmode_l.h"
  51 /* +o (channel op) */
  52 #include "modes/cmode_o.h"
  53 /* +h (channel halfop) */
  54 #include "modes/cmode_h.h"
  55 /* +v (channel voice) */
  56 #include "modes/cmode_v.h"
  57
  58 /* +s (server notices) */
  59 #include "modes/umode_s.h"
  60 /* +w (see wallops) */
  61 #include "modes/umode_w.h"
  62 /* +i (invisible) */
  63 #include "modes/umode_i.h"
  64 /* +o (operator) */
  65 #include "modes/umode_o.h"
  66
  67 extern int MODCOUNT;
  68 extern std::vector<Module*> modules;
  69 extern std::vector<ircd_module*> factory;
  70 extern InspIRCd* ServerInstance;
  71 extern ServerConfig* Config;
  72
  73 extern time_t TIME;
  74
  75 ModeHandler::ModeHandler(char modeletter, int parameters_on, int parameters_off, bool listmode, ModeType type, bool operonly)
  76         : mode(modeletter), n_params_on(parameters_on), n_params_off(parameters_off), list(listmode), m_type(type), oper(operonly)
  77 {
  78 }
  79
  80 ModeHandler::~ModeHandler()
  81 {
  82 }
  83
  84 bool ModeHandler::IsListMode()
  85 {
  86         return list;
  87 }
  88
  89 ModeType ModeHandler::GetModeType()
  90 {
  91         return m_type;
  92 }
  93
  94 bool ModeHandler::NeedsOper()
  95 {
  96         return oper;
  97 }
  98
  99 int ModeHandler::GetNumParams(bool adding)
 100 {
 101         return adding ? n_params_on : n_params_off;
 102 }
 103
 104 char ModeHandler::GetModeChar()
 105 {
 106         return mode;
 107 }
 108
 109 ModeAction ModeHandler::OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 110 {
 111         return MODEACTION_DENY;
 112 }
 113
 114 void ModeHandler::DisplayList(userrec* user, chanrec* channel)
 115 {
 116 }
 117
 118 bool ModeHandler::CheckTimeStamp(time_t theirs, time_t ours, const std::string &their_param, const std::string &our_param, chanrec* channel)
 119 {
 120         return (ours < theirs);
 121 }
 122
 123 ModeWatcher::ModeWatcher(char modeletter, ModeType type) : mode(modeletter), m_type(type)
 124 {
 125 }
 126
 127 ModeWatcher::~ModeWatcher()
 128 {
 129 }
 130
 131 char ModeWatcher::GetModeChar()
 132 {
 133         return mode;
 134 }
 135
 136 ModeType ModeWatcher::GetModeType()
 137 {
 138         return m_type;
 139 }
 140
 141 bool ModeWatcher::BeforeMode(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding, ModeType type)
 142 {
 143         return true;
 144 }
 145
 146 void ModeWatcher::AfterMode(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter, bool adding, ModeType type)
 147 {
 148 }
 149
 150 userrec* ModeParser::SanityChecks(userrec *user,const char *dest,chanrec *chan,int status)
 151 {
 152         userrec *d;
 153         if ((!user) || (!dest) || (!chan) || (!*dest))
 154         {
 155                 return NULL;
 156         }
 157         d = Find(dest);
 158         if (!d)
 159         {
 160                 WriteServ(user->fd,"401 %s %s :No such nick/channel",user->nick, dest);
 161                 return NULL;
 162         }
 163         return d;
 164 }
 165
 166 const char* ModeParser::Grant(userrec *d,chanrec *chan,int MASK)
 167 {
 168         if (!chan)
 169                 return "";
 170
 171         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 172         {
 173                 ucrec* n = (ucrec*)(*i);
 174                 if (n->channel == chan)
 175                 {
 176                         if (n->uc_modes & MASK)
 177                         {
 178                                 return "";
 179                         }
 180                         n->uc_modes = ((ucrec*)(*i))->uc_modes | MASK;
 181                         switch (MASK)
 182                         {
 183                                 case UCMODE_OP:
 184                                         n->channel->AddOppedUser(d);
 185                                 break;
 186                                 case UCMODE_HOP:
 187                                         n->channel->AddHalfoppedUser(d);
 188                                 break;
 189                                 case UCMODE_VOICE:
 190                                         n->channel->AddVoicedUser(d);
 191                                 break;
 192                         }
 193                         log(DEBUG,"grant: %s %s",n->channel->name,d->nick);
 194                         return d->nick;
 195                 }
 196         }
 197         return "";
 198 }
 199
 200 const char* ModeParser::Revoke(userrec *d,chanrec *chan,int MASK)
 201 {
 202         if (!chan)
 203                 return "";
 204
 205         for (std::vector<ucrec*>::const_iterator i = d->chans.begin(); i != d->chans.end(); i++)
 206         {
 207                 ucrec* n = (ucrec*)(*i);
 208                 if (n->channel == chan)
 209                 {
 210                         if ((n->uc_modes & MASK) == 0)
 211                         {
 212                                 return "";
 213                         }
 214                         n->uc_modes ^= MASK;
 215                         switch (MASK)
 216                         {
 217                                 case UCMODE_OP:
 218                                         n->channel->DelOppedUser(d);
 219                                 break;
 220                                 case UCMODE_HOP:
 221                                         n->channel->DelHalfoppedUser(d);
 222                                 break;
 223                                 case UCMODE_VOICE:
 224                                         n->channel->DelVoicedUser(d);
 225                                 break;
 226                         }
 227                         log(DEBUG,"revoke: %s %s",n->channel->name,d->nick);
 228                         return d->nick;
 229                 }
 230         }
 231         return "";
 232 }
 233
 234 void ModeParser::DisplayCurrentModes(userrec *user, userrec* targetuser, chanrec* targetchannel, const char* text)
 235 {
 236         if (targetchannel)
 237         {
 238                 /* Display channel's current mode string */
 239                 WriteServ(user->fd,"324 %s %s +%s",user->nick, targetchannel->name, chanmodes(targetchannel, targetchannel->HasUser(user)));
 240                 WriteServ(user->fd,"329 %s %s %d", user->nick, targetchannel->name, targetchannel->created);
 241                 return;
 242         }
 243         else if (targetuser)
 244         {
 245                 /* Display user's current mode string */
 246                 WriteServ(user->fd,"221 %s :+%s",targetuser->nick,targetuser->FormatModes());
 247                 return;
 248         }
 249         /* No such nick/channel */
 250         WriteServ(user->fd,"401 %s %s :No such nick/channel",user->nick, text);
 251         return;
 252 }
 253
 254 void ModeParser::Process(char **parameters, int pcnt, userrec *user, bool servermode)
 255 {
 256         std::string target = parameters[0];
 257         ModeType type = MODETYPE_USER;
 258         unsigned char mask = 0;
 259         chanrec* targetchannel = FindChan(parameters[0]);
 260         userrec* targetuser  = Find(parameters[0]);
 261
 262         log(DEBUG,"ModeParser::Process start");
 263
 264         if (pcnt == 1)
 265         {
 266                 this->DisplayCurrentModes(user, targetuser, targetchannel, parameters[0]);
 267         }
 268         else if (pcnt > 1)
 269         {
 270                 if (targetchannel)
 271                 {
 272                         type = MODETYPE_CHANNEL;
 273                         mask = MASK_CHANNEL;
 274
 275                         /* Extra security checks on channel modes
 276                          * (e.g. are they a (half)op?
 277                          */
 278
 279                         if (cstatus(user, targetchannel) < STATUS_HOP)
 280                         {
 281                                 /* We don't have halfop */
 282                                 log(DEBUG,"The user is not a halfop or above, checking other reasons for being able to set the modes");
 283
 284                                 /* Are we a uline or is it a servermode? */
 285                                 if ((!is_uline(user->server)) && (!servermode))
 286                                 {
 287                                         /* Not enough permission:
 288                                          * NOT a uline and NOT a servermode,
 289                                          * OR, NOT halfop or above.
 290                                          */
 291                                         WriteServ(user->fd,"482 %s %s :You're not a channel (half)operator",user->nick, targetchannel->name);
 292                                         return;
 293                                 }
 294                         }
 295                 }
 296                 else if (targetuser)
 297                 {
 298                         type = MODETYPE_USER;
 299                         mask = MASK_USER;
 300                 }
 301                 else
 302                 {
 303                         /* No such nick/channel */
 304                         WriteServ(user->fd,"401 %s %s :No such nick/channel",user->nick, parameters[0]);
 305                         return;
 306                 }
 307                 std::string mode_sequence = parameters[1];
 308                 std::string parameter = "";
 309                 std::ostringstream parameter_list;
 310                 std::string output_sequence = "";
 311                 bool adding = true, state_change = false;
 312                 int handler_id = 0;
 313                 int parameter_counter = 2; /* Index of first parameter */
 314
 315                 for (std::string::const_iterator letter = mode_sequence.begin(); letter != mode_sequence.end(); letter++)
 316                 {
 317                         unsigned char modechar = *letter;
 318
 319                         switch (modechar)
 320                         {
 321                                 /* NB:
 322                                  * For + and - mode characters, we don't just stick the character into the output sequence.
 323                                  * This is because the user may do something dumb, like: +-+ooo or +oo-+. To prevent this
 324                                  * appearing in the output sequence, we store a flag which says there was a state change,
 325                                  * which is set on any + or -, however, the + or - that we finish on is only appended to
 326                                  * the output stream in the event it is followed by a non "+ or -" character, such as o or v.
 327                                  */
 328                                 case '+':
 329                                         /* The following expression prevents: +o+o nick nick, compressing it to +oo nick nick,
 330                                          * however, will allow the + if it is the first item in the sequence, regardless.
 331                                          */
 332                                         if ((!adding) || (!output_sequence.length()))
 333                                                 state_change = true;
 334                                         adding = true;
 335                                         continue;
 336                                 break;
 337                                 case '-':
 338                                         if ((adding) || (!output_sequence.length()))
 339                                                 state_change = true;
 340                                         adding = false;
 341                                         continue;
 342                                 break;
 343                                 default:
 344
 345                                         /**
 346                                          * Watch carefully for the sleight of hand trick.
 347                                          * 65 is the ascii value of 'A'. We take this from
 348                                          * the char we're looking at to get a number between
 349                                          * 1 and 127. We then logic-or it to get the hashed
 350                                          * position, dependent on wether its a channel or
 351                                          * a user mode. This is a little stranger, but a lot
 352                                          * faster, than using a map of pairs.
 353                                          */
 354                                         handler_id = (modechar - 65) | mask;
 355
 356                                         if (modehandlers[handler_id])
 357                                         {
 358                                                 bool abort = false;
 359
 360                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 361                                                 {
 362                                                         if ((*watchers)->BeforeMode(user, targetuser, targetchannel, parameter, adding, type) == MODEACTION_DENY)
 363                                                                 abort = true;
 364                                                 }
 365                                                 if ((modehandlers[handler_id]->GetModeType() == type) && (!abort))
 366                                                 {
 367                                                         if (modehandlers[handler_id]->GetNumParams(adding))
 368                                                         {
 369                                                                 /* This mode expects a parameter, do we have any parameters left in our list to use? */
 370                                                                 if (parameter_counter < pcnt)
 371                                                                 {
 372                                                                         parameter = parameters[parameter_counter++];
 373                                                                 }
 374                                                                 else
 375                                                                 {
 376                                                                         /* No parameter, continue to the next mode */
 377                                                                         continue;
 378                                                                 }
 379                                                         }
 380
 381                                                         /* It's an oper only mode, check if theyre an oper. If they arent,
 382                                                          * eat any parameter that  came with the mode, and continue to next
 383                                                          */
 384                                                         if ((modehandlers[handler_id]->NeedsOper()) && (!*user->oper))
 385                                                                 continue;
 386
 387                                                         /* Call the handler for the mode */
 388                                                         ModeAction ma = modehandlers[handler_id]->OnModeChange(user, targetuser, targetchannel, parameter, adding);
 389
 390                                                         if ((modehandlers[handler_id]->GetNumParams(adding)) && (parameter == ""))
 391                                                         {
 392                                                                 /* The handler nuked the parameter and they are supposed to have one.
 393                                                                  * We CANT continue now, even if they actually returned MODEACTION_ALLOW,
 394                                                                  * so we bail to the next mode character.
 395                                                                  */
 396                                                                 continue;
 397                                                         }
 398
 399                                                         if (ma == MODEACTION_ALLOW)
 400                                                         {
 401                                                                 /* We're about to output a valid mode letter - was there previously a pending state-change? */
 402                                                                 if (state_change)
 403                                                                         output_sequence.append(adding ? "+" : "-");
 404
 405                                                                 /* Add the mode letter */
 406                                                                 output_sequence.push_back(modechar);
 407
 408                                                                 /* Is there a valid parameter for this mode? If so add it to the parameter list */
 409                                                                 if ((modehandlers[handler_id]->GetNumParams(adding)) && (parameter != ""))
 410                                                                         parameter_list << " " << parameter;
 411
 412                                                                 /* Call all the AfterMode events in the mode watchers for this mode */
 413                                                                 for (ModeWatchIter watchers = modewatchers[handler_id].begin(); watchers != modewatchers[handler_id].end(); watchers++)
 414                                                                         (*watchers)->AfterMode(user, targetuser, targetchannel, parameter, adding, type);
 415
 416                                                                 /* Reset the state change flag */
 417                                                                 state_change = false;
 418                                                         }
 419                                                 }
 420                                         }
 421                                         else
 422                                         {
 423                                                 /* No mode handler? Unknown mode character then. */
 424                                                 WriteServ(user->fd,"472 %s %c :is unknown mode char to me",user->nick, modechar);
 425                                         }
 426                                 break;
 427                         }
 428                 }
 429                 /* Was there at least one valid mode in the sequence? */
 430                 if (output_sequence != "")
 431                 {
 432                         if (servermode)
 433                         {
 434                                 if (type == MODETYPE_CHANNEL)
 435                                 {
 436                                         WriteChannelWithServ(Config->ServerName,targetchannel,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 437                                 }
 438                                 else
 439                                 {
 440                                         WriteServ(targetuser->fd,"MODE %s %s",targetuser->nick,output_sequence.c_str());
 441                                 }
 442                         }
 443                         else
 444                         {
 445                                 if (type == MODETYPE_CHANNEL)
 446                                 {
 447                                         log(DEBUG,"Write output sequence and parameters to channel: %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 448                                         WriteChannel(targetchannel,user,"MODE %s %s%s",targetchannel->name,output_sequence.c_str(),parameter_list.str().c_str());
 449                                         FOREACH_MOD(I_OnMode,OnMode(user, targetchannel, TYPE_CHANNEL, output_sequence + parameter_list.str()));
 450                                 }
 451                                 else
 452                                 {
 453                                         WriteTo(user,targetuser,"MODE %s %s",targetuser->nick,output_sequence.c_str());
 454                                         FOREACH_MOD(I_OnMode,OnMode(user, targetuser, TYPE_USER, output_sequence));
 455                                 }
 456                         }
 457                 }
 458         }
 459 }
 460
 461
 462 void cmd_mode::Handle (char **parameters, int pcnt, userrec *user)
 463 {
 464         if (!user)
 465                 return;
 466
 467         ServerInstance->ModeGrok->Process(parameters, pcnt, user, false);
 468
 469         return;
 470 }
 471
 472 void ModeParser::CleanMask(std::string &mask)
 473 {
 474         std::string::size_type pos_of_pling = mask.find_first_of('!');
 475         std::string::size_type pos_of_at = mask.find_first_of('@');
 476         std::string::size_type pos_of_dot = mask.find_first_of('.');
 477         std::string::size_type pos_of_colon = mask.find_first_of(':'); /* Because ipv6 addresses are colon delimited */
 478
 479         if ((pos_of_pling == std::string::npos) && (pos_of_at == std::string::npos))
 480         {
 481                 /* Just a nick, or just a host */
 482                 if ((pos_of_dot == std::string::npos) && (pos_of_colon == std::string::npos))
 483                 {
 484                         /* It has no '.' in it, it must be a nick. */
 485                         mask.append("!*@*");
 486                 }
 487                 else
 488                 {
 489                         /* Got a dot in it? Has to be a host */
 490                         mask = "*!*@" + mask;
 491                 }
 492         }
 493         else if ((pos_of_pling == std::string::npos) && (pos_of_at != std::string::npos))
 494         {
 495                 /* Has an @ but no !, its a user@host */
 496                  mask = "*!" + mask;
 497         }
 498         else if ((pos_of_pling != std::string::npos) && (pos_of_at == std::string::npos))
 499         {
 500                 /* Has a ! but no @, it must be a nick!ident */
 501                 mask.append("@*");
 502         }
 503 }
 504
 505 void ModeParser::BuildModeString(userrec* user)
 506 {
 507 }
 508
 509 bool ModeParser::AddMode(ModeHandler* mh, unsigned const char modeletter)
 510 {
 511         unsigned char mask = 0;
 512         unsigned char pos = 0;
 513
 514         /* Yes, i know, this might let people declare modes like '_' or '^'.
 515          * If they do that, thats their problem, and if i ever EVER see an
 516          * official InspIRCd developer do that, i'll beat them with a paddle!
 517          */
 518         if ((modeletter < 'A') || (modeletter > 'z'))
 519                 return false;
 520
 521         mh->GetModeType() == MODETYPE_USER ? mask = MASK_USER : mask = MASK_CHANNEL;
 522         pos = (modeletter-65) | mask;
 523
 524         if (modehandlers[pos])
 525                 return false;
 526
 527         modehandlers[pos] = mh;
 528         log(DEBUG,"ModeParser::AddMode: added mode %c",modeletter);
 529         return true;
 530 }
 531
 532 ModeParser::ModeParser()
 533 {
 534         /* Clear mode list */
 535         memset(modehandlers, 0, sizeof(modehandlers));
 536         memset(modewatchers, 0, sizeof(modewatchers));
 537
 538         /* Initialise the RFC mode letters */
 539
 540         /* Start with channel simple modes, no params */
 541         this->AddMode(new ModeChannelSecret, 's');
 542         this->AddMode(new ModeChannelPrivate, 'p');
 543         this->AddMode(new ModeChannelModerated, 'm');
 544         this->AddMode(new ModeChannelTopicOps, 't');
 545         this->AddMode(new ModeChannelNoExternal, 'n');
 546         this->AddMode(new ModeChannelInviteOnly, 'i');
 547
 548         /* Cannel modes with params */
 549         this->AddMode(new ModeChannelKey, 'k');
 550         this->AddMode(new ModeChannelLimit, 'l');
 551
 552         /* Channel listmodes */
 553         this->AddMode(new ModeChannelBan, 'b');
 554         this->AddMode(new ModeChannelOp, 'o');
 555         this->AddMode(new ModeChannelHalfOp, 'h');
 556         this->AddMode(new ModeChannelVoice, 'v');
 557
 558         /* Now for usermodes */
 559         this->AddMode(new ModeUserServerNotice, 's');
 560         this->AddMode(new ModeUserWallops, 'w');
 561         this->AddMode(new ModeUserInvisible, 'i');
 562         this->AddMode(new ModeUserOperator, 'o');
 563
 564         /* TODO: User modes +swio */
 565 }
 566