src/channels.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 /* $Core */
  15
  16 #include "inspircd.h"
  17 #include <cstdarg>
  18 #include "mode.h"
  19
  20 Channel::Channel(InspIRCd* Instance, const std::string &cname, time_t ts) : ServerInstance(Instance)
  21 {
  22         chan_hash::iterator findchan = ServerInstance->chanlist->find(cname);
  23         if (findchan != Instance->chanlist->end())
  24                 throw CoreException("Cannot create duplicate channel " + cname);
  25
  26         (*(ServerInstance->chanlist))[cname.c_str()] = this;
  27         this->name.assign(cname, 0, ServerInstance->Config->Limits.ChanMax);
  28         this->age = ts ? ts : ServerInstance->Time();
  29
  30         maxbans = topicset = 0;
  31         modes.reset();
  32 }
  33
  34 void Channel::SetMode(char mode,bool mode_on)
  35 {
  36         modes[mode-65] = mode_on;
  37 }
  38
  39 void Channel::SetModeParam(char mode, std::string parameter)
  40 {
  41         CustomModeList::iterator n = custom_mode_params.find(mode);
  42         // always erase, even if changing, so that the map gets the new value
  43         if (n != custom_mode_params.end())
  44                 custom_mode_params.erase(n);
  45         if (parameter.empty())
  46         {
  47                 modes[mode-65] = false;
  48         }
  49         else
  50         {
  51                 custom_mode_params[mode] = parameter;
  52                 modes[mode-65] = true;
  53         }
  54 }
  55
  56 bool Channel::IsModeSet(char mode)
  57 {
  58         return modes[mode-65];
  59 }
  60
  61 std::string Channel::GetModeParameter(char mode)
  62 {
  63         CustomModeList::iterator n = custom_mode_params.find(mode);
  64         if (n != custom_mode_params.end())
  65                 return n->second;
  66         return "";
  67 }
  68
  69 int Channel::SetTopic(User *u, std::string &ntopic, bool forceset)
  70 {
  71         if (u && IS_LOCAL(u))
  72         {
  73                 if(!forceset)
  74                 {
  75                         int MOD_RESULT = 0;
  76                         /* 0: check status, 1: don't, -1: disallow change silently */
  77
  78                         FOREACH_RESULT(I_OnLocalTopicChange,OnLocalTopicChange(u,this,ntopic));
  79
  80                         if (MOD_RESULT == 1)
  81                                 return CMD_FAILURE;
  82                         else if (MOD_RESULT == 0)
  83                         {
  84                                 if (!this->HasUser(u))
  85                                 {
  86                                         u->WriteNumeric(442, "%s %s :You're not on that channel!",u->nick.c_str(), this->name.c_str());
  87                                         return CMD_FAILURE;
  88                                 }
  89                                 if ((this->IsModeSet('t')) && (this->GetStatus(u) < STATUS_HOP))
  90                                 {
  91                                         u->WriteNumeric(482, "%s %s :You must be at least a half-operator to change the topic on this channel", u->nick.c_str(), this->name.c_str());
  92                                         return CMD_FAILURE;
  93                                 }
  94                         }
  95                 }
  96         }
  97
  98         this->topic.assign(ntopic, 0, ServerInstance->Config->Limits.MaxTopic);
  99         if (u)
 100         {
 101                 this->setby.assign(ServerInstance->Config->FullHostInTopic ? u->GetFullHost() : u->nick, 0, 128);
 102                 this->WriteChannel(u, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
 103         }
 104         else
 105         {
 106                 this->setby.assign(ServerInstance->Config->ServerName);
 107                 this->WriteChannelWithServ(ServerInstance->Config->ServerName, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
 108         }
 109
 110         this->topicset = ServerInstance->Time();
 111
 112         if (u && IS_LOCAL(u))
 113         {
 114                 FOREACH_MOD(I_OnPostLocalTopicChange,OnPostLocalTopicChange(u, this, this->topic));
 115         }
 116
 117         return CMD_SUCCESS;
 118 }
 119
 120 long Channel::GetUserCounter()
 121 {
 122         return (this->internal_userlist.size());
 123 }
 124
 125 void Channel::AddUser(User* user)
 126 {
 127         internal_userlist[user] = user->nick;
 128 }
 129
 130 unsigned long Channel::DelUser(User* user)
 131 {
 132         CUListIter a = internal_userlist.find(user);
 133
 134         if (a != internal_userlist.end())
 135         {
 136                 internal_userlist.erase(a);
 137                 /* And tidy any others... */
 138                 DelOppedUser(user);
 139                 DelHalfoppedUser(user);
 140                 DelVoicedUser(user);
 141         }
 142
 143         return internal_userlist.size();
 144 }
 145
 146 bool Channel::HasUser(User* user)
 147 {
 148         return (internal_userlist.find(user) != internal_userlist.end());
 149 }
 150
 151 void Channel::AddOppedUser(User* user)
 152 {
 153         internal_op_userlist[user] = user->nick;
 154 }
 155
 156 void Channel::DelOppedUser(User* user)
 157 {
 158         CUListIter a = internal_op_userlist.find(user);
 159         if (a != internal_op_userlist.end())
 160         {
 161                 internal_op_userlist.erase(a);
 162                 return;
 163         }
 164 }
 165
 166 void Channel::AddHalfoppedUser(User* user)
 167 {
 168         internal_halfop_userlist[user] = user->nick;
 169 }
 170
 171 void Channel::DelHalfoppedUser(User* user)
 172 {
 173         CUListIter a = internal_halfop_userlist.find(user);
 174
 175         if (a != internal_halfop_userlist.end())
 176         {
 177                 internal_halfop_userlist.erase(a);
 178         }
 179 }
 180
 181 void Channel::AddVoicedUser(User* user)
 182 {
 183         internal_voice_userlist[user] = user->nick;
 184 }
 185
 186 void Channel::DelVoicedUser(User* user)
 187 {
 188         CUListIter a = internal_voice_userlist.find(user);
 189
 190         if (a != internal_voice_userlist.end())
 191         {
 192                 internal_voice_userlist.erase(a);
 193         }
 194 }
 195
 196 CUList* Channel::GetUsers()
 197 {
 198         return &internal_userlist;
 199 }
 200
 201 CUList* Channel::GetOppedUsers()
 202 {
 203         return &internal_op_userlist;
 204 }
 205
 206 CUList* Channel::GetHalfoppedUsers()
 207 {
 208         return &internal_halfop_userlist;
 209 }
 210
 211 CUList* Channel::GetVoicedUsers()
 212 {
 213         return &internal_voice_userlist;
 214 }
 215
 216 void Channel::SetDefaultModes()
 217 {
 218         ServerInstance->Logs->Log("CHANNELS", DEBUG, "SetDefaultModes %s", ServerInstance->Config->DefaultModes);
 219         irc::spacesepstream list(ServerInstance->Config->DefaultModes);
 220         std::string modeseq;
 221         std::string parameter;
 222
 223         list.GetToken(modeseq);
 224
 225         for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 226         {
 227                 ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 228                 if (mode)
 229                 {
 230                         if (mode->GetNumParams(true))
 231                                 list.GetToken(parameter);
 232                         else
 233                                 parameter.clear();
 234
 235                         mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, this, parameter, true);
 236                 }
 237         }
 238 }
 239
 240 /*
 241  * add a channel to a user, creating the record for it if needed and linking
 242  * it to the user record
 243  */
 244 Channel* Channel::JoinUser(InspIRCd* Instance, User *user, const char* cn, bool override, const char* key, bool bursting, time_t TS)
 245 {
 246         // Fix: unregistered users could be joined using /SAJOIN
 247         if (!user || !cn || user->registered != REG_ALL)
 248                 return NULL;
 249
 250         char cname[MAXBUF];
 251         int MOD_RESULT = 0;
 252         std::string privs;
 253         Channel *Ptr;
 254
 255         /*
 256          * We don't restrict the number of channels that remote users or users that are override-joining may be in.
 257          * We restrict local users to MaxChans channels.
 258          * We restrict local operators to OperMaxChans channels.
 259          * This is a lot more logical than how it was formerly. -- w00t
 260          */
 261         if (IS_LOCAL(user) && !override)
 262         {
 263                 // Checking MyClass exists because we *may* get here with NULL, not 100% sure.
 264                 if (user->MyClass && user->MyClass->maxchans)
 265                 {
 266                         if (user->HasPrivPermission("channels/high-join-limit"))
 267                         {
 268                                 if (user->chans.size() >= Instance->Config->OperMaxChans)
 269                                 {
 270                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 271                                         return NULL;
 272                                 }
 273                         }
 274                         else
 275                         {
 276                                 if (user->chans.size() >= user->MyClass->maxchans)
 277                                 {
 278                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 279                                         return NULL;
 280                                 }
 281                         }
 282                 }
 283         }
 284
 285         strlcpy(cname, cn, Instance->Config->Limits.ChanMax);
 286         Ptr = Instance->FindChan(cname);
 287         bool created_by_local = false;
 288
 289         if (!Ptr)
 290         {
 291                 /*
 292                  * Fix: desync bug was here, don't set @ on remote users - spanningtree handles their permissions. bug #358. -- w00t
 293                  */
 294                 if (!IS_LOCAL(user))
 295                 {
 296                         if (!TS)
 297                                 Instance->Logs->Log("CHANNEL",DEBUG,"*** BUG *** Channel::JoinUser called for REMOTE user '%s' on channel '%s' but no TS given!", user->nick.c_str(), cn);
 298                 }
 299                 else
 300                 {
 301                         privs = "@";
 302                         created_by_local = true;
 303                 }
 304
 305                 if (IS_LOCAL(user) && override == false)
 306                 {
 307                         MOD_RESULT = 0;
 308                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, NULL, cname, privs, key ? key : ""));
 309                         if (MOD_RESULT == 1)
 310                                 return NULL;
 311                 }
 312
 313                 Ptr = new Channel(Instance, cname, TS);
 314         }
 315         else
 316         {
 317                 /* Already on the channel */
 318                 if (Ptr->HasUser(user))
 319                         return NULL;
 320
 321                 /*
 322                  * remote users are allowed us to bypass channel modes
 323                  * and bans (used by servers)
 324                  */
 325                 if (IS_LOCAL(user) && override == false)
 326                 {
 327                         MOD_RESULT = 0;
 328                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, Ptr, cname, privs, key ? key : ""));
 329                         if (MOD_RESULT == 1)
 330                         {
 331                                 return NULL;
 332                         }
 333                         else if (MOD_RESULT == 0)
 334                         {
 335                                 std::string ckey = Ptr->GetModeParameter('k');
 336                                 bool invited = user->IsInvited(Ptr->name.c_str());
 337                                 bool can_bypass = Instance->Config->InvBypassModes && invited;
 338
 339                                 if (!ckey.empty())
 340                                 {
 341                                         MOD_RESULT = 0;
 342                                         FOREACH_RESULT_I(Instance, I_OnCheckKey, OnCheckKey(user, Ptr, key ? key : ""));
 343                                         if (!MOD_RESULT)
 344                                         {
 345                                                 // If no key provided, or key is not the right one, and can't bypass +k (not invited or option not enabled)
 346                                                 if ((!key || ckey != key) && !can_bypass)
 347                                                 {
 348                                                         user->WriteNumeric(ERR_BADCHANNELKEY, "%s %s :Cannot join channel (Incorrect channel key)",user->nick.c_str(), Ptr->name.c_str());
 349                                                         return NULL;
 350                                                 }
 351                                         }
 352                                 }
 353
 354                                 if (Ptr->IsModeSet('i'))
 355                                 {
 356                                         MOD_RESULT = 0;
 357                                         FOREACH_RESULT_I(Instance,I_OnCheckInvite,OnCheckInvite(user, Ptr));
 358                                         if (!MOD_RESULT)
 359                                         {
 360                                                 if (!invited)
 361                                                 {
 362                                                         user->WriteNumeric(ERR_INVITEONLYCHAN, "%s %s :Cannot join channel (Invite only)",user->nick.c_str(), Ptr->name.c_str());
 363                                                         return NULL;
 364                                                 }
 365                                         }
 366                                 }
 367
 368                                 std::string limit = Ptr->GetModeParameter('l');
 369                                 if (!limit.empty())
 370                                 {
 371                                         MOD_RESULT = 0;
 372                                         FOREACH_RESULT_I(Instance, I_OnCheckLimit, OnCheckLimit(user, Ptr));
 373                                         if (!MOD_RESULT)
 374                                         {
 375                                                 long llimit = atol(limit.c_str());
 376                                                 if (Ptr->GetUserCounter() >= llimit && !can_bypass)
 377                                                 {
 378                                                         user->WriteNumeric(ERR_CHANNELISFULL, "%s %s :Cannot join channel (Channel is full)",user->nick.c_str(), Ptr->name.c_str());
 379                                                         return NULL;
 380                                                 }
 381                                         }
 382                                 }
 383
 384                                 if (Ptr->IsBanned(user) && !can_bypass)
 385                                 {
 386                                         user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s %s :Cannot join channel (You're banned)",user->nick.c_str(), Ptr->name.c_str());
 387                                         return NULL;
 388                                 }
 389
 390                                 /*
 391                                  * If the user has invites for this channel, remove them now
 392                                  * after a successful join so they don't build up.
 393                                  */
 394                                 if (invited)
 395                                 {
 396                                         user->RemoveInvite(Ptr->name.c_str());
 397                                 }
 398                         }
 399                 }
 400         }
 401
 402         if (created_by_local)
 403         {
 404                 /* As spotted by jilles, dont bother to set this on remote users */
 405                 Ptr->SetDefaultModes();
 406         }
 407
 408         return Channel::ForceChan(Instance, Ptr, user, privs, bursting);
 409 }
 410
 411 Channel* Channel::ForceChan(InspIRCd* Instance, Channel* Ptr, User* user, const std::string &privs, bool bursting)
 412 {
 413         std::string nick = user->nick;
 414         bool silent = false;
 415
 416         Ptr->AddUser(user);
 417
 418         /* Just in case they have no permissions */
 419         user->chans[Ptr] = 0;
 420
 421         for (std::string::const_iterator x = privs.begin(); x != privs.end(); x++)
 422         {
 423                 const char status = *x;
 424                 ModeHandler* mh = Instance->Modes->FindPrefix(status);
 425                 if (mh)
 426                 {
 427                         /* Set, and make sure that the mode handler knows this mode was now set */
 428                         Ptr->SetPrefix(user, status, mh->GetPrefixRank(), true);
 429                         mh->OnModeChange(Instance->FakeClient, Instance->FakeClient, Ptr, nick, true);
 430
 431                         switch (mh->GetPrefix())
 432                         {
 433                                 /* These logic ops are SAFE IN THIS CASE because if the entry doesnt exist,
 434                                  * addressing operator[] creates it. If they do exist, it points to it.
 435                                  * At all other times where we dont want to create an item if it doesnt exist, we
 436                                  * must stick to ::find().
 437                                  */
 438                                 case '@':
 439                                         user->chans[Ptr] |= UCMODE_OP;
 440                                 break;
 441                                 case '%':
 442                                         user->chans[Ptr] |= UCMODE_HOP;
 443                                 break;
 444                                 case '+':
 445                                         user->chans[Ptr] |= UCMODE_VOICE;
 446                                 break;
 447                         }
 448                 }
 449         }
 450
 451         FOREACH_MOD_I(Instance,I_OnUserJoin,OnUserJoin(user, Ptr, bursting, silent));
 452
 453         if (!silent)
 454                 Ptr->WriteChannel(user,"JOIN :%s",Ptr->name.c_str());
 455
 456         /* Theyre not the first ones in here, make sure everyone else sees the modes we gave the user */
 457         std::string ms = Instance->Modes->ModeString(user, Ptr);
 458         if ((Ptr->GetUserCounter() > 1) && (ms.length()))
 459                 Ptr->WriteAllExceptSender(user, true, 0, "MODE %s +%s", Ptr->name.c_str(), ms.c_str());
 460
 461         /* Major improvement by Brain - we dont need to be calculating all this pointlessly for remote users */
 462         if (IS_LOCAL(user))
 463         {
 464                 if (Ptr->topicset)
 465                 {
 466                         user->WriteNumeric(RPL_TOPIC, "%s %s :%s", user->nick.c_str(), Ptr->name.c_str(), Ptr->topic.c_str());
 467                         user->WriteNumeric(RPL_TOPICTIME, "%s %s %s %lu", user->nick.c_str(), Ptr->name.c_str(), Ptr->setby.c_str(), (unsigned long)Ptr->topicset);
 468                 }
 469                 Ptr->UserList(user);
 470         }
 471         FOREACH_MOD_I(Instance,I_OnPostJoin,OnPostJoin(user, Ptr));
 472         return Ptr;
 473 }
 474
 475 bool Channel::IsBanned(User* user)
 476 {
 477         int result = 0;
 478         FOREACH_RESULT_MAP(I_OnCheckBan, OnCheckBan(user, this),
 479                 result = banmatch_reduce(result, MOD_RESULT);
 480         );
 481
 482         if (result)
 483                 return (result < 0);
 484
 485         char mask[MAXBUF];
 486         snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 487         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 488         {
 489                 if ((InspIRCd::Match(user->GetFullHost(),i->data, NULL)) || // host
 490                         (InspIRCd::Match(user->GetFullRealHost(),i->data, NULL)) || // uncloaked host
 491                         (InspIRCd::MatchCIDR(mask, i->data, NULL))) // ip
 492                 {
 493                         return true;
 494                 }
 495         }
 496         return false;
 497 }
 498
 499 int Channel::GetExtBanStatus(const std::string &str, char type)
 500 {
 501         int result = 0;
 502         FOREACH_RESULT_MAP(I_OnCheckStringExtBan, OnCheckStringExtBan(str, this, type),
 503                 result = banmatch_reduce(result, MOD_RESULT);
 504         );
 505
 506         if (result)
 507                 return result;
 508
 509         // nobody decided for us, check the ban list
 510         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 511         {
 512                 if (i->data[0] != type || i->data[1] != ':')
 513                         continue;
 514
 515                 std::string maskptr = i->data.substr(2);
 516                 ServerInstance->Logs->Log("EXTBANS", DEBUG, "Checking %s against %s, type is %c", str.c_str(), maskptr.c_str(), type);
 517
 518                 if (InspIRCd::Match(str, maskptr, NULL))
 519                         return -1;
 520         }
 521
 522         return 0;
 523 }
 524
 525 int Channel::GetExtBanStatus(User *user, char type)
 526 {
 527         int result = 0;
 528         FOREACH_RESULT_MAP(I_OnCheckExtBan, OnCheckExtBan(user, this, type),
 529                 result = banmatch_reduce(result, MOD_RESULT);
 530         );
 531
 532         if (result)
 533                 return result;
 534
 535         char mask[MAXBUF];
 536         int rv = 0;
 537         snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 538
 539         // XXX: we should probably hook cloaked hosts in here somehow too..
 540         rv = banmatch_reduce(rv, this->GetExtBanStatus(mask, type));
 541         rv = banmatch_reduce(rv, this->GetExtBanStatus(user->GetFullHost(), type));
 542         rv = banmatch_reduce(rv, this->GetExtBanStatus(user->GetFullRealHost(), type));
 543         return rv;
 544 }
 545
 546 /* Channel::PartUser
 547  * remove a channel from a users record, and return the number of users left.
 548  * Therefore, if this function returns 0 the caller should delete the Channel.
 549  */
 550 long Channel::PartUser(User *user, std::string &reason)
 551 {
 552         bool silent = false;
 553
 554         if (!user)
 555                 return this->GetUserCounter();
 556
 557         UCListIter i = user->chans.find(this);
 558         if (i != user->chans.end())
 559         {
 560                 FOREACH_MOD(I_OnUserPart,OnUserPart(user, this, reason, silent));
 561
 562                 if (!silent)
 563                         this->WriteChannel(user, "PART %s%s%s", this->name.c_str(), reason.empty() ? "" : " :", reason.c_str());
 564
 565                 user->chans.erase(i);
 566                 this->RemoveAllPrefixes(user);
 567         }
 568
 569         if (!this->DelUser(user)) /* if there are no users left on the channel... */
 570         {
 571                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 572                 /* kill the record */
 573                 if (iter != ServerInstance->chanlist->end())
 574                 {
 575                         int MOD_RESULT = 0;
 576                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 577                         if (MOD_RESULT == 1)
 578                                 return 1; // delete halted by module
 579                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 580                         ServerInstance->chanlist->erase(iter);
 581                 }
 582                 return 0;
 583         }
 584
 585         return this->GetUserCounter();
 586 }
 587
 588 long Channel::ServerKickUser(User* user, const char* reason, const char* servername)
 589 {
 590         if (servername == NULL || *ServerInstance->Config->HideWhoisServer)
 591                 servername = ServerInstance->Config->ServerName;
 592
 593         ServerInstance->FakeClient->server = servername;
 594         return this->KickUser(ServerInstance->FakeClient, user, reason);
 595 }
 596
 597 long Channel::KickUser(User *src, User *user, const char* reason)
 598 {
 599         bool silent = false;
 600
 601         if (!src || !user || !reason)
 602                 return this->GetUserCounter();
 603
 604         if (IS_LOCAL(src))
 605         {
 606                 if (!this->HasUser(user))
 607                 {
 608                         src->WriteNumeric(ERR_USERNOTINCHANNEL, "%s %s %s :They are not on that channel",src->nick.c_str(), user->nick.c_str(), this->name.c_str());
 609                         return this->GetUserCounter();
 610                 }
 611                 if ((ServerInstance->ULine(user->server)) && (!ServerInstance->ULine(src->server)))
 612                 {
 613                         src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :Only a u-line may kick a u-line from a channel.",src->nick.c_str(), this->name.c_str());
 614                         return this->GetUserCounter();
 615                 }
 616                 int MOD_RESULT = 0;
 617
 618                 if (!ServerInstance->ULine(src->server))
 619                 {
 620                         MOD_RESULT = 0;
 621                         FOREACH_RESULT(I_OnUserPreKick,OnUserPreKick(src,user,this,reason));
 622                         if (MOD_RESULT == 1)
 623                                 return this->GetUserCounter();
 624                 }
 625                 /* Set to -1 by OnUserPreKick if explicit allow was set */
 626                 if (MOD_RESULT != -1)
 627                 {
 628                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(src,user,this,AC_KICK));
 629                         if ((MOD_RESULT == ACR_DENY) && (!ServerInstance->ULine(src->server)))
 630                                 return this->GetUserCounter();
 631
 632                         if ((MOD_RESULT == ACR_DEFAULT) || (!ServerInstance->ULine(src->server)))
 633                         {
 634                                 int them = this->GetStatus(src);
 635                                 int us = this->GetStatus(user);
 636                                 if ((them < STATUS_HOP) || (them < us))
 637                                 {
 638                                         src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :You must be a channel %soperator",src->nick.c_str(), this->name.c_str(), them == STATUS_HOP ? "" : "half-");
 639                                         return this->GetUserCounter();
 640                                 }
 641                         }
 642                 }
 643         }
 644
 645         FOREACH_MOD(I_OnUserKick,OnUserKick(src, user, this, reason, silent));
 646
 647         UCListIter i = user->chans.find(this);
 648         if (i != user->chans.end())
 649         {
 650                 /* zap it from the channel list of the user */
 651                 if (!silent)
 652                         this->WriteChannel(src, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 653
 654                 user->chans.erase(i);
 655                 this->RemoveAllPrefixes(user);
 656         }
 657
 658         if (!this->DelUser(user))
 659         /* if there are no users left on the channel */
 660         {
 661                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name.c_str());
 662
 663                 /* kill the record */
 664                 if (iter != ServerInstance->chanlist->end())
 665                 {
 666                         int MOD_RESULT = 0;
 667                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 668                         if (MOD_RESULT == 1)
 669                                 return 1; // delete halted by module
 670                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 671                         ServerInstance->chanlist->erase(iter);
 672                 }
 673                 return 0;
 674         }
 675
 676         return this->GetUserCounter();
 677 }
 678
 679 void Channel::WriteChannel(User* user, const char* text, ...)
 680 {
 681         char textbuffer[MAXBUF];
 682         va_list argsPtr;
 683
 684         if (!user || !text)
 685                 return;
 686
 687         va_start(argsPtr, text);
 688         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 689         va_end(argsPtr);
 690
 691         this->WriteChannel(user, std::string(textbuffer));
 692 }
 693
 694 void Channel::WriteChannel(User* user, const std::string &text)
 695 {
 696         CUList *ulist = this->GetUsers();
 697         char tb[MAXBUF];
 698
 699         if (!user)
 700                 return;
 701
 702         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 703         std::string out = tb;
 704
 705         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 706         {
 707                 if (IS_LOCAL(i->first))
 708                         i->first->Write(out);
 709         }
 710 }
 711
 712 void Channel::WriteChannelWithServ(const char* ServName, const char* text, ...)
 713 {
 714         char textbuffer[MAXBUF];
 715         va_list argsPtr;
 716
 717         if (!text)
 718                 return;
 719
 720         va_start(argsPtr, text);
 721         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 722         va_end(argsPtr);
 723
 724         this->WriteChannelWithServ(ServName, std::string(textbuffer));
 725 }
 726
 727 void Channel::WriteChannelWithServ(const char* ServName, const std::string &text)
 728 {
 729         CUList *ulist = this->GetUsers();
 730         char tb[MAXBUF];
 731
 732         snprintf(tb,MAXBUF,":%s %s", ServName ? ServName : ServerInstance->Config->ServerName, text.c_str());
 733         std::string out = tb;
 734
 735         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 736         {
 737                 if (IS_LOCAL(i->first))
 738                         i->first->Write(out);
 739         }
 740 }
 741
 742 /* write formatted text from a source user to all users on a channel except
 743  * for the sender (for privmsg etc) */
 744 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const char* text, ...)
 745 {
 746         char textbuffer[MAXBUF];
 747         va_list argsPtr;
 748
 749         if (!text)
 750                 return;
 751
 752         va_start(argsPtr, text);
 753         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 754         va_end(argsPtr);
 755
 756         this->WriteAllExceptSender(user, serversource, status, std::string(textbuffer));
 757 }
 758
 759 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const char* text, ...)
 760 {
 761         char textbuffer[MAXBUF];
 762         va_list argsPtr;
 763
 764         if (!text)
 765                 return;
 766
 767         va_start(argsPtr, text);
 768         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 769         va_end(argsPtr);
 770
 771         this->WriteAllExcept(user, serversource, status, except_list, std::string(textbuffer));
 772 }
 773
 774 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &text)
 775 {
 776         CUList *ulist = this->GetUsers();
 777         char tb[MAXBUF];
 778
 779         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 780         std::string out = tb;
 781
 782         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 783         {
 784                 if ((IS_LOCAL(i->first)) && (except_list.find(i->first) == except_list.end()))
 785                 {
 786                         /* User doesnt have the status we're after */
 787                         if (status && !strchr(this->GetAllPrefixChars(i->first), status))
 788                                 continue;
 789
 790                         if (serversource)
 791                                 i->first->WriteServ(text);
 792                         else
 793                                 i->first->Write(out);
 794                 }
 795         }
 796 }
 797
 798 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const std::string& text)
 799 {
 800         CUList except_list;
 801         except_list[user] = user->nick;
 802         this->WriteAllExcept(user, serversource, status, except_list, std::string(text));
 803 }
 804
 805 /*
 806  * return a count of the users on a specific channel accounting for
 807  * invisible users who won't increase the count. e.g. for /LIST
 808  */
 809 int Channel::CountInvisible()
 810 {
 811         int count = 0;
 812         CUList *ulist= this->GetUsers();
 813         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 814         {
 815                 if (!(i->first->IsModeSet('i')))
 816                         count++;
 817         }
 818
 819         return count;
 820 }
 821
 822 char* Channel::ChanModes(bool showkey)
 823 {
 824         static char scratch[MAXBUF];
 825         static char sparam[MAXBUF];
 826         char* offset = scratch;
 827         std::string extparam;
 828
 829         *scratch = '\0';
 830         *sparam = '\0';
 831
 832         /* This was still iterating up to 190, Channel::modes is only 64 elements -- Om */
 833         for(int n = 0; n < 64; n++)
 834         {
 835                 if(this->modes[n])
 836                 {
 837                         *offset++ = n + 65;
 838                         extparam.clear();
 839                         switch (n)
 840                         {
 841                                 case CM_KEY:
 842                                         // Unfortunately this must be special-cased, as we definitely don't want to always display key.
 843                                         if (showkey)
 844                                         {
 845                                                 extparam = this->GetModeParameter('k');
 846                                         }
 847                                         else
 848                                         {
 849                                                 extparam = "<key>";
 850                                         }
 851                                         break;
 852                                 case CM_NOEXTERNAL:
 853                                 case CM_TOPICLOCK:
 854                                 case CM_INVITEONLY:
 855                                 case CM_MODERATED:
 856                                 case CM_SECRET:
 857                                 case CM_PRIVATE:
 858                                         /* We know these have no parameters */
 859                                 break;
 860                                 default:
 861                                         extparam = this->GetModeParameter(n + 65);
 862                                 break;
 863                         }
 864                         if (!extparam.empty())
 865                         {
 866                                 charlcat(sparam,' ',MAXBUF);
 867                                 strlcat(sparam,extparam.c_str(),MAXBUF);
 868                         }
 869                 }
 870         }
 871
 872         /* Null terminate scratch */
 873         *offset = '\0';
 874         strlcat(scratch,sparam,MAXBUF);
 875         return scratch;
 876 }
 877
 878 /* compile a userlist of a channel into a string, each nick seperated by
 879  * spaces and op, voice etc status shown as @ and +, and send it to 'user'
 880  */
 881 void Channel::UserList(User *user, CUList *ulist)
 882 {
 883         char list[MAXBUF];
 884         size_t dlen, curlen;
 885         int MOD_RESULT = 0;
 886         bool call_modules = true;
 887
 888         if (!IS_LOCAL(user))
 889                 return;
 890
 891         FOREACH_RESULT(I_OnUserList,OnUserList(user, this, ulist));
 892         if (MOD_RESULT == 1)
 893                 call_modules = false;
 894
 895         if (MOD_RESULT != -1)
 896         {
 897                 if ((this->IsModeSet('s')) && (!this->HasUser(user)))
 898                 {
 899                         user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel",user->nick.c_str(), this->name.c_str());
 900                         return;
 901                 }
 902         }
 903
 904         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=',  this->name.c_str());
 905
 906         int numusers = 0;
 907         char* ptr = list + dlen;
 908
 909         if (!ulist)
 910                 ulist = this->GetUsers();
 911
 912         /* Improvement by Brain - this doesnt change in value, so why was it inside
 913          * the loop?
 914          */
 915         bool has_user = this->HasUser(user);
 916
 917         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 918         {
 919                 if ((!has_user) && (i->first->IsModeSet('i')))
 920                 {
 921                         /*
 922                          * user is +i, and source not on the channel, does not show
 923                          * nick in NAMES list
 924                          */
 925                         continue;
 926                 }
 927
 928                 if (i->first->Visibility && !i->first->Visibility->VisibleTo(user))
 929                         continue;
 930
 931                 std::string prefixlist = this->GetPrefixChar(i->first);
 932                 std::string nick = i->first->nick;
 933
 934                 if (call_modules)
 935                 {
 936                         FOREACH_MOD(I_OnNamesListItem, OnNamesListItem(user, i->first, this, prefixlist, nick));
 937
 938                         /* Nick was nuked, a module wants us to skip it */
 939                         if (nick.empty())
 940                                 continue;
 941                 }
 942
 943                 size_t ptrlen = 0;
 944
 945                 if (curlen + prefixlist.length() + nick.length() + 1 > 480)
 946                 {
 947                         /* list overflowed into multiple numerics */
 948                         user->WriteNumeric(RPL_NAMREPLY, std::string(list));
 949
 950                         /* reset our lengths */
 951                         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=', this->name.c_str());
 952                         ptr = list + dlen;
 953
 954                         ptrlen = 0;
 955                         numusers = 0;
 956                 }
 957
 958                 ptrlen = snprintf(ptr, MAXBUF, "%s%s ", prefixlist.c_str(), nick.c_str());
 959
 960                 curlen += ptrlen;
 961                 ptr += ptrlen;
 962
 963                 numusers++;
 964         }
 965
 966         /* if whats left in the list isnt empty, send it */
 967         if (numusers)
 968         {
 969                 user->WriteNumeric(RPL_NAMREPLY, std::string(list));
 970         }
 971
 972         user->WriteNumeric(RPL_ENDOFNAMES, "%s %s :End of /NAMES list.", user->nick.c_str(), this->name.c_str());
 973 }
 974
 975 long Channel::GetMaxBans()
 976 {
 977         /* Return the cached value if there is one */
 978         if (this->maxbans)
 979                 return this->maxbans;
 980
 981         /* If there isnt one, we have to do some O(n) hax to find it the first time. (ick) */
 982         for (std::map<std::string,int>::iterator n = ServerInstance->Config->maxbans.begin(); n != ServerInstance->Config->maxbans.end(); n++)
 983         {
 984                 if (InspIRCd::Match(this->name, n->first, NULL))
 985                 {
 986                         this->maxbans = n->second;
 987                         return n->second;
 988                 }
 989         }
 990
 991         /* Screw it, just return the default of 64 */
 992         this->maxbans = 64;
 993         return this->maxbans;
 994 }
 995
 996 void Channel::ResetMaxBans()
 997 {
 998         this->maxbans = 0;
 999 }
1000
1001 /* returns the status character for a given user on a channel, e.g. @ for op,
1002  * % for halfop etc. If the user has several modes set, the highest mode
1003  * the user has must be returned.
1004  */
1005 const char* Channel::GetPrefixChar(User *user)
1006 {
1007         static char pf[2] = {0, 0};
1008
1009         prefixlist::iterator n = prefixes.find(user);
1010         if (n != prefixes.end())
1011         {
1012                 if (n->second.size())
1013                 {
1014                         /* If the user has any prefixes, their highest prefix
1015                          * will always be at the head of the list, as the list is
1016                          * sorted in rank order highest first (see SetPrefix()
1017                          * for reasons why)
1018                          */
1019                         *pf = n->second.begin()->first;
1020                         return pf;
1021                 }
1022         }
1023
1024         *pf = 0;
1025         return pf;
1026 }
1027
1028
1029 const char* Channel::GetAllPrefixChars(User* user)
1030 {
1031         static char prefix[MAXBUF];
1032         int ctr = 0;
1033         *prefix = 0;
1034
1035         prefixlist::iterator n = prefixes.find(user);
1036         if (n != prefixes.end())
1037         {
1038                 for (std::vector<prefixtype>::iterator x = n->second.begin(); x != n->second.end(); x++)
1039                 {
1040                         prefix[ctr++] = x->first;
1041                 }
1042         }
1043
1044         prefix[ctr] = 0;
1045
1046         return prefix;
1047 }
1048
1049 unsigned int Channel::GetPrefixValue(User* user)
1050 {
1051         prefixlist::iterator n = prefixes.find(user);
1052         if (n != prefixes.end())
1053         {
1054                 if (n->second.size())
1055                         return n->second.begin()->second;
1056         }
1057         return 0;
1058 }
1059
1060 int Channel::GetStatusFlags(User *user)
1061 {
1062         UCListIter i = user->chans.find(this);
1063         if (i != user->chans.end())
1064         {
1065                 return i->second;
1066         }
1067         return 0;
1068 }
1069
1070 int Channel::GetStatus(User *user)
1071 {
1072         if (ServerInstance->ULine(user->server))
1073                 return STATUS_OP;
1074
1075         UCListIter i = user->chans.find(this);
1076         if (i != user->chans.end())
1077         {
1078                 if ((i->second & UCMODE_OP) > 0)
1079                 {
1080                         return STATUS_OP;
1081                 }
1082                 if ((i->second & UCMODE_HOP) > 0)
1083                 {
1084                         return STATUS_HOP;
1085                 }
1086                 if ((i->second & UCMODE_VOICE) > 0)
1087                 {
1088                         return STATUS_VOICE;
1089                 }
1090                 return STATUS_NORMAL;
1091         }
1092         return STATUS_NORMAL;
1093 }
1094
1095 void Channel::SetPrefix(User* user, char prefix, unsigned int prefix_value, bool adding)
1096 {
1097         prefixlist::iterator n = prefixes.find(user);
1098         prefixtype pfx = std::make_pair(prefix,prefix_value);
1099         if (adding)
1100         {
1101                 if (n != prefixes.end())
1102                 {
1103                         if (std::find(n->second.begin(), n->second.end(), pfx) == n->second.end())
1104                         {
1105                                 n->second.push_back(pfx);
1106                                 /* We must keep prefixes in rank order, largest first.
1107                                  * This is for two reasons, firstly because x-chat *ass-u-me's* this
1108                                  * state, and secondly it turns out to be a benefit to us later.
1109                                  * See above in GetPrefix().
1110                                  */
1111                                 std::sort(n->second.begin(), n->second.end(), ModeParser::PrefixComparison);
1112                         }
1113                 }
1114                 else
1115                 {
1116                         pfxcontainer one;
1117                         one.push_back(pfx);
1118                         prefixes.insert(std::make_pair<User*,pfxcontainer>(user, one));
1119                 }
1120         }
1121         else
1122         {
1123                 if (n != prefixes.end())
1124                 {
1125                         pfxcontainer::iterator x = std::find(n->second.begin(), n->second.end(), pfx);
1126                         if (x != n->second.end())
1127                                 n->second.erase(x);
1128                 }
1129         }
1130 }
1131
1132 void Channel::RemoveAllPrefixes(User* user)
1133 {
1134         prefixlist::iterator n = prefixes.find(user);
1135         if (n != prefixes.end())
1136         {
1137                 prefixes.erase(n);
1138         }
1139 }