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::SetMode(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         if (!user || !cn)
 247                 return NULL;
 248
 249         char cname[MAXBUF];
 250         int MOD_RESULT = 0;
 251         std::string privs;
 252         Channel *Ptr;
 253
 254         /*
 255          * We don't restrict the number of channels that remote users or users that are override-joining may be in.
 256          * We restrict local users to MaxChans channels.
 257          * We restrict local operators to OperMaxChans channels.
 258          * This is a lot more logical than how it was formerly. -- w00t
 259          */
 260         if (IS_LOCAL(user) && !override)
 261         {
 262                 // Checking MyClass exists because we *may* get here with NULL, not 100% sure.
 263                 if (user->MyClass && user->MyClass->GetMaxChans())
 264                 {
 265                         if (user->chans.size() >= user->MyClass->GetMaxChans())
 266                         {
 267                                 user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 268                                 return NULL;
 269                         }
 270                 }
 271                 else
 272                 {
 273                         if (user->HasPrivPermission("channels/high-join-limit"))
 274                         {
 275                                 if (user->chans.size() >= Instance->Config->OperMaxChans)
 276                                 {
 277                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 278                                         return NULL;
 279                                 }
 280                         }
 281                         else
 282                         {
 283                                 if (user->chans.size() >= Instance->Config->MaxChans)
 284                                 {
 285                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 286                                         return NULL;
 287                                 }
 288                         }
 289                 }
 290         }
 291
 292         strlcpy(cname, cn, Instance->Config->Limits.ChanMax);
 293         Ptr = Instance->FindChan(cname);
 294         bool created_by_local = false;
 295
 296         if (!Ptr)
 297         {
 298                 /*
 299                  * Fix: desync bug was here, don't set @ on remote users - spanningtree handles their permissions. bug #358. -- w00t
 300                  */
 301                 if (!IS_LOCAL(user))
 302                 {
 303                         if (!TS)
 304                                 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);
 305                 }
 306                 else
 307                 {
 308                         privs = "@";
 309                         created_by_local = true;
 310                 }
 311
 312                 if (IS_LOCAL(user) && override == false)
 313                 {
 314                         MOD_RESULT = 0;
 315                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, NULL, cname, privs, key ? key : ""));
 316                         if (MOD_RESULT == 1)
 317                                 return NULL;
 318                 }
 319
 320                 Ptr = new Channel(Instance, cname, TS);
 321         }
 322         else
 323         {
 324                 /* Already on the channel */
 325                 if (Ptr->HasUser(user))
 326                         return NULL;
 327
 328                 /*
 329                  * remote users are allowed us to bypass channel modes
 330                  * and bans (used by servers)
 331                  */
 332                 if (IS_LOCAL(user) && override == false)
 333                 {
 334                         MOD_RESULT = 0;
 335                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, Ptr, cname, privs, key ? key : ""));
 336                         if (MOD_RESULT == 1)
 337                         {
 338                                 return NULL;
 339                         }
 340                         else if (MOD_RESULT == 0)
 341                         {
 342                                 std::string ckey = Ptr->GetModeParameter('k');
 343                                 bool invited = user->IsInvited(Ptr->name.c_str());
 344                                 bool can_bypass = Instance->Config->InvBypassModes && invited;
 345
 346                                 if (!ckey.empty())
 347                                 {
 348                                         MOD_RESULT = 0;
 349                                         FOREACH_RESULT_I(Instance, I_OnCheckKey, OnCheckKey(user, Ptr, key ? key : ""));
 350                                         if (!MOD_RESULT)
 351                                         {
 352                                                 // If no key provided, or key is not the right one, and can't bypass +k (not invited or option not enabled)
 353                                                 if ((!key || ckey != key) && !can_bypass)
 354                                                 {
 355                                                         user->WriteNumeric(ERR_BADCHANNELKEY, "%s %s :Cannot join channel (Incorrect channel key)",user->nick.c_str(), Ptr->name.c_str());
 356                                                         return NULL;
 357                                                 }
 358                                         }
 359                                 }
 360
 361                                 if (Ptr->IsModeSet('i'))
 362                                 {
 363                                         MOD_RESULT = 0;
 364                                         FOREACH_RESULT_I(Instance,I_OnCheckInvite,OnCheckInvite(user, Ptr));
 365                                         if (!MOD_RESULT)
 366                                         {
 367                                                 if (!invited)
 368                                                 {
 369                                                         user->WriteNumeric(ERR_INVITEONLYCHAN, "%s %s :Cannot join channel (Invite only)",user->nick.c_str(), Ptr->name.c_str());
 370                                                         return NULL;
 371                                                 }
 372                                         }
 373                                 }
 374
 375                                 std::string limit = Ptr->GetModeParameter('l');
 376                                 if (!limit.empty())
 377                                 {
 378                                         MOD_RESULT = 0;
 379                                         FOREACH_RESULT_I(Instance, I_OnCheckLimit, OnCheckLimit(user, Ptr));
 380                                         if (!MOD_RESULT)
 381                                         {
 382                                                 long llimit = atol(limit.c_str());
 383                                                 if (Ptr->GetUserCounter() >= llimit && !can_bypass)
 384                                                 {
 385                                                         user->WriteNumeric(ERR_CHANNELISFULL, "%s %s :Cannot join channel (Channel is full)",user->nick.c_str(), Ptr->name.c_str());
 386                                                         return NULL;
 387                                                 }
 388                                         }
 389                                 }
 390
 391                                 if (Ptr->IsBanned(user) && !can_bypass)
 392                                 {
 393                                         user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s %s :Cannot join channel (You're banned)",user->nick.c_str(), Ptr->name.c_str());
 394                                         return NULL;
 395                                 }
 396
 397                                 /*
 398                                  * If the user has invites for this channel, remove them now
 399                                  * after a successful join so they don't build up.
 400                                  */
 401                                 if (invited)
 402                                 {
 403                                         user->RemoveInvite(Ptr->name.c_str());
 404                                 }
 405                         }
 406                 }
 407         }
 408
 409         if (created_by_local)
 410         {
 411                 /* As spotted by jilles, dont bother to set this on remote users */
 412                 Ptr->SetDefaultModes();
 413         }
 414
 415         return Channel::ForceChan(Instance, Ptr, user, privs, bursting);
 416 }
 417
 418 Channel* Channel::ForceChan(InspIRCd* Instance, Channel* Ptr, User* user, const std::string &privs, bool bursting)
 419 {
 420         std::string nick = user->nick;
 421         bool silent = false;
 422
 423         Ptr->AddUser(user);
 424
 425         /* Just in case they have no permissions */
 426         user->chans[Ptr] = 0;
 427
 428         for (std::string::const_iterator x = privs.begin(); x != privs.end(); x++)
 429         {
 430                 const char status = *x;
 431                 ModeHandler* mh = Instance->Modes->FindPrefix(status);
 432                 if (mh)
 433                 {
 434                         /* Set, and make sure that the mode handler knows this mode was now set */
 435                         Ptr->SetPrefix(user, status, mh->GetPrefixRank(), true);
 436                         mh->OnModeChange(Instance->FakeClient, Instance->FakeClient, Ptr, nick, true);
 437
 438                         switch (mh->GetPrefix())
 439                         {
 440                                 /* These logic ops are SAFE IN THIS CASE because if the entry doesnt exist,
 441                                  * addressing operator[] creates it. If they do exist, it points to it.
 442                                  * At all other times where we dont want to create an item if it doesnt exist, we
 443                                  * must stick to ::find().
 444                                  */
 445                                 case '@':
 446                                         user->chans[Ptr] |= UCMODE_OP;
 447                                 break;
 448                                 case '%':
 449                                         user->chans[Ptr] |= UCMODE_HOP;
 450                                 break;
 451                                 case '+':
 452                                         user->chans[Ptr] |= UCMODE_VOICE;
 453                                 break;
 454                         }
 455                 }
 456         }
 457
 458         FOREACH_MOD_I(Instance,I_OnUserJoin,OnUserJoin(user, Ptr, bursting, silent));
 459
 460         if (!silent)
 461                 Ptr->WriteChannel(user,"JOIN :%s",Ptr->name.c_str());
 462
 463         /* Theyre not the first ones in here, make sure everyone else sees the modes we gave the user */
 464         std::string ms = Instance->Modes->ModeString(user, Ptr);
 465         if ((Ptr->GetUserCounter() > 1) && (ms.length()))
 466                 Ptr->WriteAllExceptSender(user, true, 0, "MODE %s +%s", Ptr->name.c_str(), ms.c_str());
 467
 468         /* Major improvement by Brain - we dont need to be calculating all this pointlessly for remote users */
 469         if (IS_LOCAL(user))
 470         {
 471                 if (Ptr->topicset)
 472                 {
 473                         user->WriteNumeric(RPL_TOPIC, "%s %s :%s", user->nick.c_str(), Ptr->name.c_str(), Ptr->topic.c_str());
 474                         user->WriteNumeric(RPL_TOPICTIME, "%s %s %s %lu", user->nick.c_str(), Ptr->name.c_str(), Ptr->setby.c_str(), (unsigned long)Ptr->topicset);
 475                 }
 476                 Ptr->UserList(user);
 477         }
 478         FOREACH_MOD_I(Instance,I_OnPostJoin,OnPostJoin(user, Ptr));
 479         return Ptr;
 480 }
 481
 482 bool Channel::IsBanned(User* user)
 483 {
 484         int result = 0;
 485         FOREACH_RESULT_MAP(I_OnCheckBan, OnCheckBan(user, this),
 486                 result = banmatch_reduce(result, MOD_RESULT);
 487         );
 488
 489         if (result)
 490                 return (result < 0);
 491
 492         char mask[MAXBUF];
 493         snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 494         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 495         {
 496                 if ((InspIRCd::Match(user->GetFullHost(),i->data, NULL)) || // host
 497                         (InspIRCd::Match(user->GetFullRealHost(),i->data, NULL)) || // uncloaked host
 498                         (InspIRCd::MatchCIDR(mask, i->data, NULL))) // ip
 499                 {
 500                         return true;
 501                 }
 502         }
 503         return false;
 504 }
 505
 506 int Channel::GetExtBanStatus(const std::string &str, char type)
 507 {
 508         int result = 0;
 509         FOREACH_RESULT_MAP(I_OnCheckStringExtBan, OnCheckStringExtBan(str, this, type),
 510                 result = banmatch_reduce(result, MOD_RESULT);
 511         );
 512
 513         if (result)
 514                 return result;
 515
 516         // nobody decided for us, check the ban list
 517         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 518         {
 519                 if (i->data[0] != type || i->data[1] != ':')
 520                         continue;
 521
 522                 std::string maskptr = i->data.substr(2);
 523                 ServerInstance->Logs->Log("EXTBANS", DEBUG, "Checking %s against %s, type is %c", str.c_str(), maskptr.c_str(), type);
 524
 525                 if (InspIRCd::Match(str, maskptr, NULL))
 526                         return -1;
 527         }
 528
 529         return 0;
 530 }
 531
 532 int Channel::GetExtBanStatus(User *user, char type)
 533 {
 534         int result = 0;
 535         FOREACH_RESULT_MAP(I_OnCheckExtBan, OnCheckExtBan(user, this, type),
 536                 result = banmatch_reduce(result, MOD_RESULT);
 537         );
 538
 539         if (result)
 540                 return result;
 541
 542         char mask[MAXBUF];
 543         int rv = 0;
 544         snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 545
 546         // XXX: we should probably hook cloaked hosts in here somehow too..
 547         rv = banmatch_reduce(rv, this->GetExtBanStatus(mask, type));
 548         rv = banmatch_reduce(rv, this->GetExtBanStatus(user->GetFullHost(), type));
 549         rv = banmatch_reduce(rv, this->GetExtBanStatus(user->GetFullRealHost(), type));
 550         return rv;
 551 }
 552
 553 /* Channel::PartUser
 554  * remove a channel from a users record, and return the number of users left.
 555  * Therefore, if this function returns 0 the caller should delete the Channel.
 556  */
 557 long Channel::PartUser(User *user, std::string &reason)
 558 {
 559         bool silent = false;
 560
 561         if (!user)
 562                 return this->GetUserCounter();
 563
 564         UCListIter i = user->chans.find(this);
 565         if (i != user->chans.end())
 566         {
 567                 FOREACH_MOD(I_OnUserPart,OnUserPart(user, this, reason, silent));
 568
 569                 if (!silent)
 570                         this->WriteChannel(user, "PART %s%s%s", this->name.c_str(), reason.empty() ? "" : " :", reason.c_str());
 571
 572                 user->chans.erase(i);
 573                 this->RemoveAllPrefixes(user);
 574         }
 575
 576         if (!this->DelUser(user)) /* if there are no users left on the channel... */
 577         {
 578                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 579                 /* kill the record */
 580                 if (iter != ServerInstance->chanlist->end())
 581                 {
 582                         int MOD_RESULT = 0;
 583                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 584                         if (MOD_RESULT == 1)
 585                                 return 1; // delete halted by module
 586                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 587                         ServerInstance->chanlist->erase(iter);
 588                 }
 589                 return 0;
 590         }
 591
 592         return this->GetUserCounter();
 593 }
 594
 595 long Channel::ServerKickUser(User* user, const char* reason, bool triggerevents, const char* servername)
 596 {
 597         bool silent = false;
 598
 599         if (!user || !reason)
 600                 return this->GetUserCounter();
 601
 602         if (IS_LOCAL(user))
 603         {
 604                 if (!this->HasUser(user))
 605                 {
 606                         /* Not on channel */
 607                         return this->GetUserCounter();
 608                 }
 609         }
 610
 611         if (servername == NULL || *ServerInstance->Config->HideWhoisServer)
 612                 servername = ServerInstance->Config->ServerName;
 613
 614         if (triggerevents)
 615         {
 616                 FOREACH_MOD(I_OnUserKick,OnUserKick(NULL, user, this, reason, silent));
 617         }
 618
 619         UCListIter i = user->chans.find(this);
 620         if (i != user->chans.end())
 621         {
 622                 if (!silent)
 623                         this->WriteChannelWithServ(servername, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 624
 625                 user->chans.erase(i);
 626                 this->RemoveAllPrefixes(user);
 627         }
 628
 629         if (!this->DelUser(user))
 630         {
 631                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 632                 /* kill the record */
 633                 if (iter != ServerInstance->chanlist->end())
 634                 {
 635                         int MOD_RESULT = 0;
 636                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 637                         if (MOD_RESULT == 1)
 638                                 return 1; // delete halted by module
 639                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 640                         ServerInstance->chanlist->erase(iter);
 641                 }
 642                 return 0;
 643         }
 644
 645         return this->GetUserCounter();
 646 }
 647
 648 long Channel::KickUser(User *src, User *user, const char* reason)
 649 {
 650         bool silent = false;
 651
 652         if (!src || !user || !reason)
 653                 return this->GetUserCounter();
 654
 655         if (IS_LOCAL(src))
 656         {
 657                 if (!this->HasUser(user))
 658                 {
 659                         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());
 660                         return this->GetUserCounter();
 661                 }
 662                 if ((ServerInstance->ULine(user->server)) && (!ServerInstance->ULine(src->server)))
 663                 {
 664                         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());
 665                         return this->GetUserCounter();
 666                 }
 667                 int MOD_RESULT = 0;
 668
 669                 if (!ServerInstance->ULine(src->server))
 670                 {
 671                         MOD_RESULT = 0;
 672                         FOREACH_RESULT(I_OnUserPreKick,OnUserPreKick(src,user,this,reason));
 673                         if (MOD_RESULT == 1)
 674                                 return this->GetUserCounter();
 675                 }
 676                 /* Set to -1 by OnUserPreKick if explicit allow was set */
 677                 if (MOD_RESULT != -1)
 678                 {
 679                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(src,user,this,AC_KICK));
 680                         if ((MOD_RESULT == ACR_DENY) && (!ServerInstance->ULine(src->server)))
 681                                 return this->GetUserCounter();
 682
 683                         if ((MOD_RESULT == ACR_DEFAULT) || (!ServerInstance->ULine(src->server)))
 684                         {
 685                                 int them = this->GetStatus(src);
 686                                 int us = this->GetStatus(user);
 687                                 if ((them < STATUS_HOP) || (them < us))
 688                                 {
 689                                         src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :You must be a channel %soperator",src->nick.c_str(), this->name.c_str(), them == STATUS_HOP ? "" : "half-");
 690                                         return this->GetUserCounter();
 691                                 }
 692                         }
 693                 }
 694         }
 695
 696         FOREACH_MOD(I_OnUserKick,OnUserKick(src, user, this, reason, silent));
 697
 698         UCListIter i = user->chans.find(this);
 699         if (i != user->chans.end())
 700         {
 701                 /* zap it from the channel list of the user */
 702                 if (!silent)
 703                         this->WriteChannel(src, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 704
 705                 user->chans.erase(i);
 706                 this->RemoveAllPrefixes(user);
 707         }
 708
 709         if (!this->DelUser(user))
 710         /* if there are no users left on the channel */
 711         {
 712                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name.c_str());
 713
 714                 /* kill the record */
 715                 if (iter != ServerInstance->chanlist->end())
 716                 {
 717                         int MOD_RESULT = 0;
 718                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 719                         if (MOD_RESULT == 1)
 720                                 return 1; // delete halted by module
 721                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 722                         ServerInstance->chanlist->erase(iter);
 723                 }
 724                 return 0;
 725         }
 726
 727         return this->GetUserCounter();
 728 }
 729
 730 void Channel::WriteChannel(User* user, const char* text, ...)
 731 {
 732         char textbuffer[MAXBUF];
 733         va_list argsPtr;
 734
 735         if (!user || !text)
 736                 return;
 737
 738         va_start(argsPtr, text);
 739         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 740         va_end(argsPtr);
 741
 742         this->WriteChannel(user, std::string(textbuffer));
 743 }
 744
 745 void Channel::WriteChannel(User* user, const std::string &text)
 746 {
 747         CUList *ulist = this->GetUsers();
 748         char tb[MAXBUF];
 749
 750         if (!user)
 751                 return;
 752
 753         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 754         std::string out = tb;
 755
 756         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 757         {
 758                 if (IS_LOCAL(i->first))
 759                         i->first->Write(out);
 760         }
 761 }
 762
 763 void Channel::WriteChannelWithServ(const char* ServName, const char* text, ...)
 764 {
 765         char textbuffer[MAXBUF];
 766         va_list argsPtr;
 767
 768         if (!text)
 769                 return;
 770
 771         va_start(argsPtr, text);
 772         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 773         va_end(argsPtr);
 774
 775         this->WriteChannelWithServ(ServName, std::string(textbuffer));
 776 }
 777
 778 void Channel::WriteChannelWithServ(const char* ServName, const std::string &text)
 779 {
 780         CUList *ulist = this->GetUsers();
 781         char tb[MAXBUF];
 782
 783         snprintf(tb,MAXBUF,":%s %s", ServName ? ServName : ServerInstance->Config->ServerName, text.c_str());
 784         std::string out = tb;
 785
 786         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 787         {
 788                 if (IS_LOCAL(i->first))
 789                         i->first->Write(out);
 790         }
 791 }
 792
 793 /* write formatted text from a source user to all users on a channel except
 794  * for the sender (for privmsg etc) */
 795 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const char* text, ...)
 796 {
 797         char textbuffer[MAXBUF];
 798         va_list argsPtr;
 799
 800         if (!text)
 801                 return;
 802
 803         va_start(argsPtr, text);
 804         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 805         va_end(argsPtr);
 806
 807         this->WriteAllExceptSender(user, serversource, status, std::string(textbuffer));
 808 }
 809
 810 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const char* text, ...)
 811 {
 812         char textbuffer[MAXBUF];
 813         va_list argsPtr;
 814
 815         if (!text)
 816                 return;
 817
 818         va_start(argsPtr, text);
 819         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 820         va_end(argsPtr);
 821
 822         this->WriteAllExcept(user, serversource, status, except_list, std::string(textbuffer));
 823 }
 824
 825 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &text)
 826 {
 827         CUList *ulist = this->GetUsers();
 828         char tb[MAXBUF];
 829
 830         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 831         std::string out = tb;
 832
 833         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 834         {
 835                 if ((IS_LOCAL(i->first)) && (except_list.find(i->first) == except_list.end()))
 836                 {
 837                         /* User doesnt have the status we're after */
 838                         if (status && !strchr(this->GetAllPrefixChars(i->first), status))
 839                                 continue;
 840
 841                         if (serversource)
 842                                 i->first->WriteServ(text);
 843                         else
 844                                 i->first->Write(out);
 845                 }
 846         }
 847 }
 848
 849 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const std::string& text)
 850 {
 851         CUList except_list;
 852         except_list[user] = user->nick;
 853         this->WriteAllExcept(user, serversource, status, except_list, std::string(text));
 854 }
 855
 856 /*
 857  * return a count of the users on a specific channel accounting for
 858  * invisible users who won't increase the count. e.g. for /LIST
 859  */
 860 int Channel::CountInvisible()
 861 {
 862         int count = 0;
 863         CUList *ulist= this->GetUsers();
 864         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 865         {
 866                 if (!(i->first->IsModeSet('i')))
 867                         count++;
 868         }
 869
 870         return count;
 871 }
 872
 873 char* Channel::ChanModes(bool showkey)
 874 {
 875         static char scratch[MAXBUF];
 876         static char sparam[MAXBUF];
 877         char* offset = scratch;
 878         std::string extparam;
 879
 880         *scratch = '\0';
 881         *sparam = '\0';
 882
 883         /* This was still iterating up to 190, Channel::modes is only 64 elements -- Om */
 884         for(int n = 0; n < 64; n++)
 885         {
 886                 if(this->modes[n])
 887                 {
 888                         *offset++ = n + 65;
 889                         extparam.clear();
 890                         switch (n)
 891                         {
 892                                 case CM_KEY:
 893                                         // Unfortunately this must be special-cased, as we definitely don't want to always display key.
 894                                         if (showkey)
 895                                         {
 896                                                 extparam = this->GetModeParameter('k');
 897                                         }
 898                                         else
 899                                         {
 900                                                 extparam = "<key>";
 901                                         }
 902                                         break;
 903                                 case CM_NOEXTERNAL:
 904                                 case CM_TOPICLOCK:
 905                                 case CM_INVITEONLY:
 906                                 case CM_MODERATED:
 907                                 case CM_SECRET:
 908                                 case CM_PRIVATE:
 909                                         /* We know these have no parameters */
 910                                 break;
 911                                 default:
 912                                         extparam = this->GetModeParameter(n + 65);
 913                                 break;
 914                         }
 915                         if (!extparam.empty())
 916                         {
 917                                 charlcat(sparam,' ',MAXBUF);
 918                                 strlcat(sparam,extparam.c_str(),MAXBUF);
 919                         }
 920                 }
 921         }
 922
 923         /* Null terminate scratch */
 924         *offset = '\0';
 925         strlcat(scratch,sparam,MAXBUF);
 926         return scratch;
 927 }
 928
 929 /* compile a userlist of a channel into a string, each nick seperated by
 930  * spaces and op, voice etc status shown as @ and +, and send it to 'user'
 931  */
 932 void Channel::UserList(User *user, CUList *ulist)
 933 {
 934         char list[MAXBUF];
 935         size_t dlen, curlen;
 936         int MOD_RESULT = 0;
 937         bool call_modules = true;
 938
 939         if (!IS_LOCAL(user))
 940                 return;
 941
 942         FOREACH_RESULT(I_OnUserList,OnUserList(user, this, ulist));
 943         if (MOD_RESULT == 1)
 944                 call_modules = false;
 945
 946         if (MOD_RESULT != -1)
 947         {
 948                 if ((this->IsModeSet('s')) && (!this->HasUser(user)))
 949                 {
 950                         user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel",user->nick.c_str(), this->name.c_str());
 951                         return;
 952                 }
 953         }
 954
 955         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=',  this->name.c_str());
 956
 957         int numusers = 0;
 958         char* ptr = list + dlen;
 959
 960         if (!ulist)
 961                 ulist = this->GetUsers();
 962
 963         /* Improvement by Brain - this doesnt change in value, so why was it inside
 964          * the loop?
 965          */
 966         bool has_user = this->HasUser(user);
 967
 968         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 969         {
 970                 if ((!has_user) && (i->first->IsModeSet('i')))
 971                 {
 972                         /*
 973                          * user is +i, and source not on the channel, does not show
 974                          * nick in NAMES list
 975                          */
 976                         continue;
 977                 }
 978
 979                 if (i->first->Visibility && !i->first->Visibility->VisibleTo(user))
 980                         continue;
 981
 982                 std::string prefixlist = this->GetPrefixChar(i->first);
 983                 std::string nick = i->first->nick;
 984
 985                 if (call_modules)
 986                 {
 987                         FOREACH_MOD(I_OnNamesListItem, OnNamesListItem(user, i->first, this, prefixlist, nick));
 988
 989                         /* Nick was nuked, a module wants us to skip it */
 990                         if (nick.empty())
 991                                 continue;
 992                 }
 993
 994                 size_t ptrlen = 0;
 995
 996                 if (curlen + prefixlist.length() + nick.length() + 1 > 480)
 997                 {
 998                         /* list overflowed into multiple numerics */
 999                         user->WriteNumeric(RPL_NAMREPLY, std::string(list));
1000
1001                         /* reset our lengths */
1002                         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=', this->name.c_str());
1003                         ptr = list + dlen;
1004
1005                         ptrlen = 0;
1006                         numusers = 0;
1007                 }
1008
1009                 ptrlen = snprintf(ptr, MAXBUF, "%s%s ", prefixlist.c_str(), nick.c_str());
1010
1011                 curlen += ptrlen;
1012                 ptr += ptrlen;
1013
1014                 numusers++;
1015         }
1016
1017         /* if whats left in the list isnt empty, send it */
1018         if (numusers)
1019         {
1020                 user->WriteNumeric(RPL_NAMREPLY, std::string(list));
1021         }
1022
1023         user->WriteNumeric(RPL_ENDOFNAMES, "%s %s :End of /NAMES list.", user->nick.c_str(), this->name.c_str());
1024 }
1025
1026 long Channel::GetMaxBans()
1027 {
1028         /* Return the cached value if there is one */
1029         if (this->maxbans)
1030                 return this->maxbans;
1031
1032         /* If there isnt one, we have to do some O(n) hax to find it the first time. (ick) */
1033         for (std::map<std::string,int>::iterator n = ServerInstance->Config->maxbans.begin(); n != ServerInstance->Config->maxbans.end(); n++)
1034         {
1035                 if (InspIRCd::Match(this->name, n->first, NULL))
1036                 {
1037                         this->maxbans = n->second;
1038                         return n->second;
1039                 }
1040         }
1041
1042         /* Screw it, just return the default of 64 */
1043         this->maxbans = 64;
1044         return this->maxbans;
1045 }
1046
1047 void Channel::ResetMaxBans()
1048 {
1049         this->maxbans = 0;
1050 }
1051
1052 /* returns the status character for a given user on a channel, e.g. @ for op,
1053  * % for halfop etc. If the user has several modes set, the highest mode
1054  * the user has must be returned.
1055  */
1056 const char* Channel::GetPrefixChar(User *user)
1057 {
1058         static char pf[2] = {0, 0};
1059
1060         prefixlist::iterator n = prefixes.find(user);
1061         if (n != prefixes.end())
1062         {
1063                 if (n->second.size())
1064                 {
1065                         /* If the user has any prefixes, their highest prefix
1066                          * will always be at the head of the list, as the list is
1067                          * sorted in rank order highest first (see SetPrefix()
1068                          * for reasons why)
1069                          */
1070                         *pf = n->second.begin()->first;
1071                         return pf;
1072                 }
1073         }
1074
1075         *pf = 0;
1076         return pf;
1077 }
1078
1079
1080 const char* Channel::GetAllPrefixChars(User* user)
1081 {
1082         static char prefix[MAXBUF];
1083         int ctr = 0;
1084         *prefix = 0;
1085
1086         prefixlist::iterator n = prefixes.find(user);
1087         if (n != prefixes.end())
1088         {
1089                 for (std::vector<prefixtype>::iterator x = n->second.begin(); x != n->second.end(); x++)
1090                 {
1091                         prefix[ctr++] = x->first;
1092                 }
1093         }
1094
1095         prefix[ctr] = 0;
1096
1097         return prefix;
1098 }
1099
1100 unsigned int Channel::GetPrefixValue(User* user)
1101 {
1102         prefixlist::iterator n = prefixes.find(user);
1103         if (n != prefixes.end())
1104         {
1105                 if (n->second.size())
1106                         return n->second.begin()->second;
1107         }
1108         return 0;
1109 }
1110
1111 int Channel::GetStatusFlags(User *user)
1112 {
1113         UCListIter i = user->chans.find(this);
1114         if (i != user->chans.end())
1115         {
1116                 return i->second;
1117         }
1118         return 0;
1119 }
1120
1121 int Channel::GetStatus(User *user)
1122 {
1123         if (ServerInstance->ULine(user->server))
1124                 return STATUS_OP;
1125
1126         UCListIter i = user->chans.find(this);
1127         if (i != user->chans.end())
1128         {
1129                 if ((i->second & UCMODE_OP) > 0)
1130                 {
1131                         return STATUS_OP;
1132                 }
1133                 if ((i->second & UCMODE_HOP) > 0)
1134                 {
1135                         return STATUS_HOP;
1136                 }
1137                 if ((i->second & UCMODE_VOICE) > 0)
1138                 {
1139                         return STATUS_VOICE;
1140                 }
1141                 return STATUS_NORMAL;
1142         }
1143         return STATUS_NORMAL;
1144 }
1145
1146 void Channel::SetPrefix(User* user, char prefix, unsigned int prefix_value, bool adding)
1147 {
1148         prefixlist::iterator n = prefixes.find(user);
1149         prefixtype pfx = std::make_pair(prefix,prefix_value);
1150         if (adding)
1151         {
1152                 if (n != prefixes.end())
1153                 {
1154                         if (std::find(n->second.begin(), n->second.end(), pfx) == n->second.end())
1155                         {
1156                                 n->second.push_back(pfx);
1157                                 /* We must keep prefixes in rank order, largest first.
1158                                  * This is for two reasons, firstly because x-chat *ass-u-me's* this
1159                                  * state, and secondly it turns out to be a benefit to us later.
1160                                  * See above in GetPrefix().
1161                                  */
1162                                 std::sort(n->second.begin(), n->second.end(), ModeParser::PrefixComparison);
1163                         }
1164                 }
1165                 else
1166                 {
1167                         pfxcontainer one;
1168                         one.push_back(pfx);
1169                         prefixes.insert(std::make_pair<User*,pfxcontainer>(user, one));
1170                 }
1171         }
1172         else
1173         {
1174                 if (n != prefixes.end())
1175                 {
1176                         pfxcontainer::iterator x = std::find(n->second.begin(), n->second.end(), pfx);
1177                         if (x != n->second.end())
1178                                 n->second.erase(x);
1179                 }
1180         }
1181 }
1182
1183 void Channel::RemoveAllPrefixes(User* user)
1184 {
1185         prefixlist::iterator n = prefixes.find(user);
1186         if (n != prefixes.end())
1187         {
1188                 prefixes.erase(n);
1189         }
1190 }