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->GetMaxChans())
 265                 {
 266                         if (user->chans.size() >= user->MyClass->GetMaxChans())
 267                         {
 268                                 user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 269                                 return NULL;
 270                         }
 271                 }
 272                 else
 273                 {
 274                         if (user->HasPrivPermission("channels/high-join-limit"))
 275                         {
 276                                 if (user->chans.size() >= Instance->Config->OperMaxChans)
 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                         else
 283                         {
 284                                 if (user->chans.size() >= Instance->Config->MaxChans)
 285                                 {
 286                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 287                                         return NULL;
 288                                 }
 289                         }
 290                 }
 291         }
 292
 293         strlcpy(cname, cn, Instance->Config->Limits.ChanMax);
 294         Ptr = Instance->FindChan(cname);
 295         bool created_by_local = false;
 296
 297         if (!Ptr)
 298         {
 299                 /*
 300                  * Fix: desync bug was here, don't set @ on remote users - spanningtree handles their permissions. bug #358. -- w00t
 301                  */
 302                 if (!IS_LOCAL(user))
 303                 {
 304                         if (!TS)
 305                                 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);
 306                 }
 307                 else
 308                 {
 309                         privs = "@";
 310                         created_by_local = true;
 311                 }
 312
 313                 if (IS_LOCAL(user) && override == false)
 314                 {
 315                         MOD_RESULT = 0;
 316                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, NULL, cname, privs, key ? key : ""));
 317                         if (MOD_RESULT == 1)
 318                                 return NULL;
 319                 }
 320
 321                 Ptr = new Channel(Instance, cname, TS);
 322         }
 323         else
 324         {
 325                 /* Already on the channel */
 326                 if (Ptr->HasUser(user))
 327                         return NULL;
 328
 329                 /*
 330                  * remote users are allowed us to bypass channel modes
 331                  * and bans (used by servers)
 332                  */
 333                 if (IS_LOCAL(user) && override == false)
 334                 {
 335                         MOD_RESULT = 0;
 336                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, Ptr, cname, privs, key ? key : ""));
 337                         if (MOD_RESULT == 1)
 338                         {
 339                                 return NULL;
 340                         }
 341                         else if (MOD_RESULT == 0)
 342                         {
 343                                 std::string ckey = Ptr->GetModeParameter('k');
 344                                 bool invited = user->IsInvited(Ptr->name.c_str());
 345                                 bool can_bypass = Instance->Config->InvBypassModes && invited;
 346
 347                                 if (!ckey.empty())
 348                                 {
 349                                         MOD_RESULT = 0;
 350                                         FOREACH_RESULT_I(Instance, I_OnCheckKey, OnCheckKey(user, Ptr, key ? key : ""));
 351                                         if (!MOD_RESULT)
 352                                         {
 353                                                 // If no key provided, or key is not the right one, and can't bypass +k (not invited or option not enabled)
 354                                                 if ((!key || ckey != key) && !can_bypass)
 355                                                 {
 356                                                         user->WriteNumeric(ERR_BADCHANNELKEY, "%s %s :Cannot join channel (Incorrect channel key)",user->nick.c_str(), Ptr->name.c_str());
 357                                                         return NULL;
 358                                                 }
 359                                         }
 360                                 }
 361
 362                                 if (Ptr->IsModeSet('i'))
 363                                 {
 364                                         MOD_RESULT = 0;
 365                                         FOREACH_RESULT_I(Instance,I_OnCheckInvite,OnCheckInvite(user, Ptr));
 366                                         if (!MOD_RESULT)
 367                                         {
 368                                                 if (!invited)
 369                                                 {
 370                                                         user->WriteNumeric(ERR_INVITEONLYCHAN, "%s %s :Cannot join channel (Invite only)",user->nick.c_str(), Ptr->name.c_str());
 371                                                         return NULL;
 372                                                 }
 373                                         }
 374                                 }
 375
 376                                 std::string limit = Ptr->GetModeParameter('l');
 377                                 if (!limit.empty())
 378                                 {
 379                                         MOD_RESULT = 0;
 380                                         FOREACH_RESULT_I(Instance, I_OnCheckLimit, OnCheckLimit(user, Ptr));
 381                                         if (!MOD_RESULT)
 382                                         {
 383                                                 long llimit = atol(limit.c_str());
 384                                                 if (Ptr->GetUserCounter() >= llimit && !can_bypass)
 385                                                 {
 386                                                         user->WriteNumeric(ERR_CHANNELISFULL, "%s %s :Cannot join channel (Channel is full)",user->nick.c_str(), Ptr->name.c_str());
 387                                                         return NULL;
 388                                                 }
 389                                         }
 390                                 }
 391
 392                                 if (Ptr->IsBanned(user) && !can_bypass)
 393                                 {
 394                                         user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s %s :Cannot join channel (You're banned)",user->nick.c_str(), Ptr->name.c_str());
 395                                         return NULL;
 396                                 }
 397
 398                                 /*
 399                                  * If the user has invites for this channel, remove them now
 400                                  * after a successful join so they don't build up.
 401                                  */
 402                                 if (invited)
 403                                 {
 404                                         user->RemoveInvite(Ptr->name.c_str());
 405                                 }
 406                         }
 407                 }
 408         }
 409
 410         if (created_by_local)
 411         {
 412                 /* As spotted by jilles, dont bother to set this on remote users */
 413                 Ptr->SetDefaultModes();
 414         }
 415
 416         return Channel::ForceChan(Instance, Ptr, user, privs, bursting);
 417 }
 418
 419 Channel* Channel::ForceChan(InspIRCd* Instance, Channel* Ptr, User* user, const std::string &privs, bool bursting)
 420 {
 421         std::string nick = user->nick;
 422         bool silent = false;
 423
 424         Ptr->AddUser(user);
 425
 426         /* Just in case they have no permissions */
 427         user->chans[Ptr] = 0;
 428
 429         for (std::string::const_iterator x = privs.begin(); x != privs.end(); x++)
 430         {
 431                 const char status = *x;
 432                 ModeHandler* mh = Instance->Modes->FindPrefix(status);
 433                 if (mh)
 434                 {
 435                         /* Set, and make sure that the mode handler knows this mode was now set */
 436                         Ptr->SetPrefix(user, status, mh->GetPrefixRank(), true);
 437                         mh->OnModeChange(Instance->FakeClient, Instance->FakeClient, Ptr, nick, true);
 438
 439                         switch (mh->GetPrefix())
 440                         {
 441                                 /* These logic ops are SAFE IN THIS CASE because if the entry doesnt exist,
 442                                  * addressing operator[] creates it. If they do exist, it points to it.
 443                                  * At all other times where we dont want to create an item if it doesnt exist, we
 444                                  * must stick to ::find().
 445                                  */
 446                                 case '@':
 447                                         user->chans[Ptr] |= UCMODE_OP;
 448                                 break;
 449                                 case '%':
 450                                         user->chans[Ptr] |= UCMODE_HOP;
 451                                 break;
 452                                 case '+':
 453                                         user->chans[Ptr] |= UCMODE_VOICE;
 454                                 break;
 455                         }
 456                 }
 457         }
 458
 459         FOREACH_MOD_I(Instance,I_OnUserJoin,OnUserJoin(user, Ptr, bursting, silent));
 460
 461         if (!silent)
 462                 Ptr->WriteChannel(user,"JOIN :%s",Ptr->name.c_str());
 463
 464         /* Theyre not the first ones in here, make sure everyone else sees the modes we gave the user */
 465         std::string ms = Instance->Modes->ModeString(user, Ptr);
 466         if ((Ptr->GetUserCounter() > 1) && (ms.length()))
 467                 Ptr->WriteAllExceptSender(user, true, 0, "MODE %s +%s", Ptr->name.c_str(), ms.c_str());
 468
 469         /* Major improvement by Brain - we dont need to be calculating all this pointlessly for remote users */
 470         if (IS_LOCAL(user))
 471         {
 472                 if (Ptr->topicset)
 473                 {
 474                         user->WriteNumeric(RPL_TOPIC, "%s %s :%s", user->nick.c_str(), Ptr->name.c_str(), Ptr->topic.c_str());
 475                         user->WriteNumeric(RPL_TOPICTIME, "%s %s %s %lu", user->nick.c_str(), Ptr->name.c_str(), Ptr->setby.c_str(), (unsigned long)Ptr->topicset);
 476                 }
 477                 Ptr->UserList(user);
 478         }
 479         FOREACH_MOD_I(Instance,I_OnPostJoin,OnPostJoin(user, Ptr));
 480         return Ptr;
 481 }
 482
 483 bool Channel::IsBanned(User* user)
 484 {
 485         int result = 0;
 486         FOREACH_RESULT_MAP(I_OnCheckBan, OnCheckBan(user, this),
 487                 result = banmatch_reduce(result, MOD_RESULT);
 488         );
 489
 490         if (result)
 491                 return (result < 0);
 492
 493         char mask[MAXBUF];
 494         snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 495         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 496         {
 497                 if ((InspIRCd::Match(user->GetFullHost(),i->data, NULL)) || // host
 498                         (InspIRCd::Match(user->GetFullRealHost(),i->data, NULL)) || // uncloaked host
 499                         (InspIRCd::MatchCIDR(mask, i->data, NULL))) // ip
 500                 {
 501                         return true;
 502                 }
 503         }
 504         return false;
 505 }
 506
 507 int Channel::GetExtBanStatus(const std::string &str, char type)
 508 {
 509         int result = 0;
 510         FOREACH_RESULT_MAP(I_OnCheckStringExtBan, OnCheckStringExtBan(str, this, type),
 511                 result = banmatch_reduce(result, MOD_RESULT);
 512         );
 513
 514         if (result)
 515                 return result;
 516
 517         // nobody decided for us, check the ban list
 518         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 519         {
 520                 if (i->data[0] != type || i->data[1] != ':')
 521                         continue;
 522
 523                 std::string maskptr = i->data.substr(2);
 524                 ServerInstance->Logs->Log("EXTBANS", DEBUG, "Checking %s against %s, type is %c", str.c_str(), maskptr.c_str(), type);
 525
 526                 if (InspIRCd::Match(str, maskptr, NULL))
 527                         return -1;
 528         }
 529
 530         return 0;
 531 }
 532
 533 int Channel::GetExtBanStatus(User *user, char type)
 534 {
 535         int result = 0;
 536         FOREACH_RESULT_MAP(I_OnCheckExtBan, OnCheckExtBan(user, this, type),
 537                 result = banmatch_reduce(result, MOD_RESULT);
 538         );
 539
 540         if (result)
 541                 return result;
 542
 543         char mask[MAXBUF];
 544         int rv = 0;
 545         snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 546
 547         // XXX: we should probably hook cloaked hosts in here somehow too..
 548         rv = banmatch_reduce(rv, this->GetExtBanStatus(mask, type));
 549         rv = banmatch_reduce(rv, this->GetExtBanStatus(user->GetFullHost(), type));
 550         rv = banmatch_reduce(rv, this->GetExtBanStatus(user->GetFullRealHost(), type));
 551         return rv;
 552 }
 553
 554 /* Channel::PartUser
 555  * remove a channel from a users record, and return the number of users left.
 556  * Therefore, if this function returns 0 the caller should delete the Channel.
 557  */
 558 long Channel::PartUser(User *user, std::string &reason)
 559 {
 560         bool silent = false;
 561
 562         if (!user)
 563                 return this->GetUserCounter();
 564
 565         UCListIter i = user->chans.find(this);
 566         if (i != user->chans.end())
 567         {
 568                 FOREACH_MOD(I_OnUserPart,OnUserPart(user, this, reason, silent));
 569
 570                 if (!silent)
 571                         this->WriteChannel(user, "PART %s%s%s", this->name.c_str(), reason.empty() ? "" : " :", reason.c_str());
 572
 573                 user->chans.erase(i);
 574                 this->RemoveAllPrefixes(user);
 575         }
 576
 577         if (!this->DelUser(user)) /* if there are no users left on the channel... */
 578         {
 579                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 580                 /* kill the record */
 581                 if (iter != ServerInstance->chanlist->end())
 582                 {
 583                         int MOD_RESULT = 0;
 584                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 585                         if (MOD_RESULT == 1)
 586                                 return 1; // delete halted by module
 587                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 588                         ServerInstance->chanlist->erase(iter);
 589                 }
 590                 return 0;
 591         }
 592
 593         return this->GetUserCounter();
 594 }
 595
 596 long Channel::ServerKickUser(User* user, const char* reason, const char* servername)
 597 {
 598         if (servername == NULL || *ServerInstance->Config->HideWhoisServer)
 599                 servername = ServerInstance->Config->ServerName;
 600
 601         ServerInstance->FakeClient->server = servername;
 602         return this->KickUser(ServerInstance->FakeClient, user, reason);
 603 }
 604
 605 long Channel::KickUser(User *src, User *user, const char* reason)
 606 {
 607         bool silent = false;
 608
 609         if (!src || !user || !reason)
 610                 return this->GetUserCounter();
 611
 612         if (IS_LOCAL(src))
 613         {
 614                 if (!this->HasUser(user))
 615                 {
 616                         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());
 617                         return this->GetUserCounter();
 618                 }
 619                 if ((ServerInstance->ULine(user->server)) && (!ServerInstance->ULine(src->server)))
 620                 {
 621                         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());
 622                         return this->GetUserCounter();
 623                 }
 624                 int MOD_RESULT = 0;
 625
 626                 if (!ServerInstance->ULine(src->server))
 627                 {
 628                         MOD_RESULT = 0;
 629                         FOREACH_RESULT(I_OnUserPreKick,OnUserPreKick(src,user,this,reason));
 630                         if (MOD_RESULT == 1)
 631                                 return this->GetUserCounter();
 632                 }
 633                 /* Set to -1 by OnUserPreKick if explicit allow was set */
 634                 if (MOD_RESULT != -1)
 635                 {
 636                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(src,user,this,AC_KICK));
 637                         if ((MOD_RESULT == ACR_DENY) && (!ServerInstance->ULine(src->server)))
 638                                 return this->GetUserCounter();
 639
 640                         if ((MOD_RESULT == ACR_DEFAULT) || (!ServerInstance->ULine(src->server)))
 641                         {
 642                                 int them = this->GetStatus(src);
 643                                 int us = this->GetStatus(user);
 644                                 if ((them < STATUS_HOP) || (them < us))
 645                                 {
 646                                         src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :You must be a channel %soperator",src->nick.c_str(), this->name.c_str(), them == STATUS_HOP ? "" : "half-");
 647                                         return this->GetUserCounter();
 648                                 }
 649                         }
 650                 }
 651         }
 652
 653         FOREACH_MOD(I_OnUserKick,OnUserKick(src, user, this, reason, silent));
 654
 655         UCListIter i = user->chans.find(this);
 656         if (i != user->chans.end())
 657         {
 658                 /* zap it from the channel list of the user */
 659                 if (!silent)
 660                         this->WriteChannel(src, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 661
 662                 user->chans.erase(i);
 663                 this->RemoveAllPrefixes(user);
 664         }
 665
 666         if (!this->DelUser(user))
 667         /* if there are no users left on the channel */
 668         {
 669                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name.c_str());
 670
 671                 /* kill the record */
 672                 if (iter != ServerInstance->chanlist->end())
 673                 {
 674                         int MOD_RESULT = 0;
 675                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 676                         if (MOD_RESULT == 1)
 677                                 return 1; // delete halted by module
 678                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 679                         ServerInstance->chanlist->erase(iter);
 680                 }
 681                 return 0;
 682         }
 683
 684         return this->GetUserCounter();
 685 }
 686
 687 void Channel::WriteChannel(User* user, const char* text, ...)
 688 {
 689         char textbuffer[MAXBUF];
 690         va_list argsPtr;
 691
 692         if (!user || !text)
 693                 return;
 694
 695         va_start(argsPtr, text);
 696         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 697         va_end(argsPtr);
 698
 699         this->WriteChannel(user, std::string(textbuffer));
 700 }
 701
 702 void Channel::WriteChannel(User* user, const std::string &text)
 703 {
 704         CUList *ulist = this->GetUsers();
 705         char tb[MAXBUF];
 706
 707         if (!user)
 708                 return;
 709
 710         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 711         std::string out = tb;
 712
 713         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 714         {
 715                 if (IS_LOCAL(i->first))
 716                         i->first->Write(out);
 717         }
 718 }
 719
 720 void Channel::WriteChannelWithServ(const char* ServName, const char* text, ...)
 721 {
 722         char textbuffer[MAXBUF];
 723         va_list argsPtr;
 724
 725         if (!text)
 726                 return;
 727
 728         va_start(argsPtr, text);
 729         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 730         va_end(argsPtr);
 731
 732         this->WriteChannelWithServ(ServName, std::string(textbuffer));
 733 }
 734
 735 void Channel::WriteChannelWithServ(const char* ServName, const std::string &text)
 736 {
 737         CUList *ulist = this->GetUsers();
 738         char tb[MAXBUF];
 739
 740         snprintf(tb,MAXBUF,":%s %s", ServName ? ServName : ServerInstance->Config->ServerName, text.c_str());
 741         std::string out = tb;
 742
 743         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 744         {
 745                 if (IS_LOCAL(i->first))
 746                         i->first->Write(out);
 747         }
 748 }
 749
 750 /* write formatted text from a source user to all users on a channel except
 751  * for the sender (for privmsg etc) */
 752 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const char* text, ...)
 753 {
 754         char textbuffer[MAXBUF];
 755         va_list argsPtr;
 756
 757         if (!text)
 758                 return;
 759
 760         va_start(argsPtr, text);
 761         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 762         va_end(argsPtr);
 763
 764         this->WriteAllExceptSender(user, serversource, status, std::string(textbuffer));
 765 }
 766
 767 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const char* text, ...)
 768 {
 769         char textbuffer[MAXBUF];
 770         va_list argsPtr;
 771
 772         if (!text)
 773                 return;
 774
 775         va_start(argsPtr, text);
 776         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 777         va_end(argsPtr);
 778
 779         this->WriteAllExcept(user, serversource, status, except_list, std::string(textbuffer));
 780 }
 781
 782 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &text)
 783 {
 784         CUList *ulist = this->GetUsers();
 785         char tb[MAXBUF];
 786
 787         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 788         std::string out = tb;
 789
 790         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 791         {
 792                 if ((IS_LOCAL(i->first)) && (except_list.find(i->first) == except_list.end()))
 793                 {
 794                         /* User doesnt have the status we're after */
 795                         if (status && !strchr(this->GetAllPrefixChars(i->first), status))
 796                                 continue;
 797
 798                         if (serversource)
 799                                 i->first->WriteServ(text);
 800                         else
 801                                 i->first->Write(out);
 802                 }
 803         }
 804 }
 805
 806 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const std::string& text)
 807 {
 808         CUList except_list;
 809         except_list[user] = user->nick;
 810         this->WriteAllExcept(user, serversource, status, except_list, std::string(text));
 811 }
 812
 813 /*
 814  * return a count of the users on a specific channel accounting for
 815  * invisible users who won't increase the count. e.g. for /LIST
 816  */
 817 int Channel::CountInvisible()
 818 {
 819         int count = 0;
 820         CUList *ulist= this->GetUsers();
 821         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 822         {
 823                 if (!(i->first->IsModeSet('i')))
 824                         count++;
 825         }
 826
 827         return count;
 828 }
 829
 830 char* Channel::ChanModes(bool showkey)
 831 {
 832         static char scratch[MAXBUF];
 833         static char sparam[MAXBUF];
 834         char* offset = scratch;
 835         std::string extparam;
 836
 837         *scratch = '\0';
 838         *sparam = '\0';
 839
 840         /* This was still iterating up to 190, Channel::modes is only 64 elements -- Om */
 841         for(int n = 0; n < 64; n++)
 842         {
 843                 if(this->modes[n])
 844                 {
 845                         *offset++ = n + 65;
 846                         extparam.clear();
 847                         switch (n)
 848                         {
 849                                 case CM_KEY:
 850                                         // Unfortunately this must be special-cased, as we definitely don't want to always display key.
 851                                         if (showkey)
 852                                         {
 853                                                 extparam = this->GetModeParameter('k');
 854                                         }
 855                                         else
 856                                         {
 857                                                 extparam = "<key>";
 858                                         }
 859                                         break;
 860                                 case CM_NOEXTERNAL:
 861                                 case CM_TOPICLOCK:
 862                                 case CM_INVITEONLY:
 863                                 case CM_MODERATED:
 864                                 case CM_SECRET:
 865                                 case CM_PRIVATE:
 866                                         /* We know these have no parameters */
 867                                 break;
 868                                 default:
 869                                         extparam = this->GetModeParameter(n + 65);
 870                                 break;
 871                         }
 872                         if (!extparam.empty())
 873                         {
 874                                 charlcat(sparam,' ',MAXBUF);
 875                                 strlcat(sparam,extparam.c_str(),MAXBUF);
 876                         }
 877                 }
 878         }
 879
 880         /* Null terminate scratch */
 881         *offset = '\0';
 882         strlcat(scratch,sparam,MAXBUF);
 883         return scratch;
 884 }
 885
 886 /* compile a userlist of a channel into a string, each nick seperated by
 887  * spaces and op, voice etc status shown as @ and +, and send it to 'user'
 888  */
 889 void Channel::UserList(User *user, CUList *ulist)
 890 {
 891         char list[MAXBUF];
 892         size_t dlen, curlen;
 893         int MOD_RESULT = 0;
 894         bool call_modules = true;
 895
 896         if (!IS_LOCAL(user))
 897                 return;
 898
 899         FOREACH_RESULT(I_OnUserList,OnUserList(user, this, ulist));
 900         if (MOD_RESULT == 1)
 901                 call_modules = false;
 902
 903         if (MOD_RESULT != -1)
 904         {
 905                 if ((this->IsModeSet('s')) && (!this->HasUser(user)))
 906                 {
 907                         user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel",user->nick.c_str(), this->name.c_str());
 908                         return;
 909                 }
 910         }
 911
 912         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=',  this->name.c_str());
 913
 914         int numusers = 0;
 915         char* ptr = list + dlen;
 916
 917         if (!ulist)
 918                 ulist = this->GetUsers();
 919
 920         /* Improvement by Brain - this doesnt change in value, so why was it inside
 921          * the loop?
 922          */
 923         bool has_user = this->HasUser(user);
 924
 925         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 926         {
 927                 if ((!has_user) && (i->first->IsModeSet('i')))
 928                 {
 929                         /*
 930                          * user is +i, and source not on the channel, does not show
 931                          * nick in NAMES list
 932                          */
 933                         continue;
 934                 }
 935
 936                 if (i->first->Visibility && !i->first->Visibility->VisibleTo(user))
 937                         continue;
 938
 939                 std::string prefixlist = this->GetPrefixChar(i->first);
 940                 std::string nick = i->first->nick;
 941
 942                 if (call_modules)
 943                 {
 944                         FOREACH_MOD(I_OnNamesListItem, OnNamesListItem(user, i->first, this, prefixlist, nick));
 945
 946                         /* Nick was nuked, a module wants us to skip it */
 947                         if (nick.empty())
 948                                 continue;
 949                 }
 950
 951                 size_t ptrlen = 0;
 952
 953                 if (curlen + prefixlist.length() + nick.length() + 1 > 480)
 954                 {
 955                         /* list overflowed into multiple numerics */
 956                         user->WriteNumeric(RPL_NAMREPLY, std::string(list));
 957
 958                         /* reset our lengths */
 959                         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=', this->name.c_str());
 960                         ptr = list + dlen;
 961
 962                         ptrlen = 0;
 963                         numusers = 0;
 964                 }
 965
 966                 ptrlen = snprintf(ptr, MAXBUF, "%s%s ", prefixlist.c_str(), nick.c_str());
 967
 968                 curlen += ptrlen;
 969                 ptr += ptrlen;
 970
 971                 numusers++;
 972         }
 973
 974         /* if whats left in the list isnt empty, send it */
 975         if (numusers)
 976         {
 977                 user->WriteNumeric(RPL_NAMREPLY, std::string(list));
 978         }
 979
 980         user->WriteNumeric(RPL_ENDOFNAMES, "%s %s :End of /NAMES list.", user->nick.c_str(), this->name.c_str());
 981 }
 982
 983 long Channel::GetMaxBans()
 984 {
 985         /* Return the cached value if there is one */
 986         if (this->maxbans)
 987                 return this->maxbans;
 988
 989         /* If there isnt one, we have to do some O(n) hax to find it the first time. (ick) */
 990         for (std::map<std::string,int>::iterator n = ServerInstance->Config->maxbans.begin(); n != ServerInstance->Config->maxbans.end(); n++)
 991         {
 992                 if (InspIRCd::Match(this->name, n->first, NULL))
 993                 {
 994                         this->maxbans = n->second;
 995                         return n->second;
 996                 }
 997         }
 998
 999         /* Screw it, just return the default of 64 */
1000         this->maxbans = 64;
1001         return this->maxbans;
1002 }
1003
1004 void Channel::ResetMaxBans()
1005 {
1006         this->maxbans = 0;
1007 }
1008
1009 /* returns the status character for a given user on a channel, e.g. @ for op,
1010  * % for halfop etc. If the user has several modes set, the highest mode
1011  * the user has must be returned.
1012  */
1013 const char* Channel::GetPrefixChar(User *user)
1014 {
1015         static char pf[2] = {0, 0};
1016
1017         prefixlist::iterator n = prefixes.find(user);
1018         if (n != prefixes.end())
1019         {
1020                 if (n->second.size())
1021                 {
1022                         /* If the user has any prefixes, their highest prefix
1023                          * will always be at the head of the list, as the list is
1024                          * sorted in rank order highest first (see SetPrefix()
1025                          * for reasons why)
1026                          */
1027                         *pf = n->second.begin()->first;
1028                         return pf;
1029                 }
1030         }
1031
1032         *pf = 0;
1033         return pf;
1034 }
1035
1036
1037 const char* Channel::GetAllPrefixChars(User* user)
1038 {
1039         static char prefix[MAXBUF];
1040         int ctr = 0;
1041         *prefix = 0;
1042
1043         prefixlist::iterator n = prefixes.find(user);
1044         if (n != prefixes.end())
1045         {
1046                 for (std::vector<prefixtype>::iterator x = n->second.begin(); x != n->second.end(); x++)
1047                 {
1048                         prefix[ctr++] = x->first;
1049                 }
1050         }
1051
1052         prefix[ctr] = 0;
1053
1054         return prefix;
1055 }
1056
1057 unsigned int Channel::GetPrefixValue(User* user)
1058 {
1059         prefixlist::iterator n = prefixes.find(user);
1060         if (n != prefixes.end())
1061         {
1062                 if (n->second.size())
1063                         return n->second.begin()->second;
1064         }
1065         return 0;
1066 }
1067
1068 int Channel::GetStatusFlags(User *user)
1069 {
1070         UCListIter i = user->chans.find(this);
1071         if (i != user->chans.end())
1072         {
1073                 return i->second;
1074         }
1075         return 0;
1076 }
1077
1078 int Channel::GetStatus(User *user)
1079 {
1080         if (ServerInstance->ULine(user->server))
1081                 return STATUS_OP;
1082
1083         UCListIter i = user->chans.find(this);
1084         if (i != user->chans.end())
1085         {
1086                 if ((i->second & UCMODE_OP) > 0)
1087                 {
1088                         return STATUS_OP;
1089                 }
1090                 if ((i->second & UCMODE_HOP) > 0)
1091                 {
1092                         return STATUS_HOP;
1093                 }
1094                 if ((i->second & UCMODE_VOICE) > 0)
1095                 {
1096                         return STATUS_VOICE;
1097                 }
1098                 return STATUS_NORMAL;
1099         }
1100         return STATUS_NORMAL;
1101 }
1102
1103 void Channel::SetPrefix(User* user, char prefix, unsigned int prefix_value, bool adding)
1104 {
1105         prefixlist::iterator n = prefixes.find(user);
1106         prefixtype pfx = std::make_pair(prefix,prefix_value);
1107         if (adding)
1108         {
1109                 if (n != prefixes.end())
1110                 {
1111                         if (std::find(n->second.begin(), n->second.end(), pfx) == n->second.end())
1112                         {
1113                                 n->second.push_back(pfx);
1114                                 /* We must keep prefixes in rank order, largest first.
1115                                  * This is for two reasons, firstly because x-chat *ass-u-me's* this
1116                                  * state, and secondly it turns out to be a benefit to us later.
1117                                  * See above in GetPrefix().
1118                                  */
1119                                 std::sort(n->second.begin(), n->second.end(), ModeParser::PrefixComparison);
1120                         }
1121                 }
1122                 else
1123                 {
1124                         pfxcontainer one;
1125                         one.push_back(pfx);
1126                         prefixes.insert(std::make_pair<User*,pfxcontainer>(user, one));
1127                 }
1128         }
1129         else
1130         {
1131                 if (n != prefixes.end())
1132                 {
1133                         pfxcontainer::iterator x = std::find(n->second.begin(), n->second.end(), pfx);
1134                         if (x != n->second.end())
1135                                 n->second.erase(x);
1136                 }
1137         }
1138 }
1139
1140 void Channel::RemoveAllPrefixes(User* user)
1141 {
1142         prefixlist::iterator n = prefixes.find(user);
1143         if (n != prefixes.end())
1144         {
1145                 prefixes.erase(n);
1146         }
1147 }