src/channels.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 /* $Core: libIRCDchannels */
  15
  16 #include "inspircd.h"
  17 #include <cstdarg>
  18 #include "wildcard.h"
  19 #include "mode.h"
  20
  21 Channel::Channel(InspIRCd* Instance, const std::string &cname, time_t ts) : ServerInstance(Instance)
  22 {
  23         chan_hash::iterator findchan = ServerInstance->chanlist->find(cname);
  24         if (findchan != Instance->chanlist->end())
  25                 throw CoreException("Cannot create duplicate channel " + cname);
  26
  27         (*(ServerInstance->chanlist))[cname.c_str()] = this;
  28         this->name.assign(cname, 0, ServerInstance->Config->Limits.ChanMax);
  29         this->created = ts ? ts : ServerInstance->Time();
  30         this->age = this->created;
  31
  32         maxbans = topicset = 0;
  33         modes.reset();
  34 }
  35
  36 void Channel::SetMode(char mode,bool mode_on)
  37 {
  38         modes[mode-65] = mode_on;
  39         if (!mode_on)
  40                 this->SetModeParam(mode,"",false);
  41 }
  42
  43
  44 void Channel::SetModeParam(char mode,const char* parameter,bool mode_on)
  45 {
  46         CustomModeList::iterator n = custom_mode_params.find(mode);
  47
  48         if (mode_on)
  49         {
  50                 if (n == custom_mode_params.end())
  51                         custom_mode_params[mode] = strdup(parameter);
  52         }
  53         else
  54         {
  55                 if (n != custom_mode_params.end())
  56                 {
  57                         free(n->second);
  58                         custom_mode_params.erase(n);
  59                 }
  60         }
  61 }
  62
  63 bool Channel::IsModeSet(char mode)
  64 {
  65         return modes[mode-65];
  66 }
  67
  68 std::string Channel::GetModeParameter(char mode)
  69 {
  70         CustomModeList::iterator n = custom_mode_params.find(mode);
  71         if (n != custom_mode_params.end())
  72                 return n->second;
  73         return "";
  74 }
  75
  76 long Channel::GetUserCounter()
  77 {
  78         return (this->internal_userlist.size());
  79 }
  80
  81 void Channel::AddUser(User* user)
  82 {
  83         internal_userlist[user] = user->nick;
  84 }
  85
  86 unsigned long Channel::DelUser(User* user)
  87 {
  88         CUListIter a = internal_userlist.find(user);
  89
  90         if (a != internal_userlist.end())
  91         {
  92                 internal_userlist.erase(a);
  93                 /* And tidy any others... */
  94                 DelOppedUser(user);
  95                 DelHalfoppedUser(user);
  96                 DelVoicedUser(user);
  97         }
  98
  99         return internal_userlist.size();
 100 }
 101
 102 bool Channel::HasUser(User* user)
 103 {
 104         return (internal_userlist.find(user) != internal_userlist.end());
 105 }
 106
 107 void Channel::AddOppedUser(User* user)
 108 {
 109         internal_op_userlist[user] = user->nick;
 110 }
 111
 112 void Channel::DelOppedUser(User* user)
 113 {
 114         CUListIter a = internal_op_userlist.find(user);
 115         if (a != internal_op_userlist.end())
 116         {
 117                 internal_op_userlist.erase(a);
 118                 return;
 119         }
 120 }
 121
 122 void Channel::AddHalfoppedUser(User* user)
 123 {
 124         internal_halfop_userlist[user] = user->nick;
 125 }
 126
 127 void Channel::DelHalfoppedUser(User* user)
 128 {
 129         CUListIter a = internal_halfop_userlist.find(user);
 130
 131         if (a != internal_halfop_userlist.end())
 132         {
 133                 internal_halfop_userlist.erase(a);
 134         }
 135 }
 136
 137 void Channel::AddVoicedUser(User* user)
 138 {
 139         internal_voice_userlist[user] = user->nick;
 140 }
 141
 142 void Channel::DelVoicedUser(User* user)
 143 {
 144         CUListIter a = internal_voice_userlist.find(user);
 145
 146         if (a != internal_voice_userlist.end())
 147         {
 148                 internal_voice_userlist.erase(a);
 149         }
 150 }
 151
 152 CUList* Channel::GetUsers()
 153 {
 154         return &internal_userlist;
 155 }
 156
 157 CUList* Channel::GetOppedUsers()
 158 {
 159         return &internal_op_userlist;
 160 }
 161
 162 CUList* Channel::GetHalfoppedUsers()
 163 {
 164         return &internal_halfop_userlist;
 165 }
 166
 167 CUList* Channel::GetVoicedUsers()
 168 {
 169         return &internal_voice_userlist;
 170 }
 171
 172 void Channel::SetDefaultModes()
 173 {
 174         ServerInstance->Logs->Log("CHANNELS", DEBUG, "SetDefaultModes %s", ServerInstance->Config->DefaultModes);
 175         irc::spacesepstream list(ServerInstance->Config->DefaultModes);
 176         std::string modeseq;
 177         std::string parameter;
 178
 179         list.GetToken(modeseq);
 180
 181         for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 182         {
 183                 ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 184                 if (mode)
 185                 {
 186                         if (mode->GetNumParams(true))
 187                                 list.GetToken(parameter);
 188                         else
 189                                 parameter.clear();
 190
 191                         mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, this, parameter, true);
 192                 }
 193         }
 194 }
 195
 196 /*
 197  * add a channel to a user, creating the record for it if needed and linking
 198  * it to the user record
 199  */
 200 Channel* Channel::JoinUser(InspIRCd* Instance, User *user, const char* cn, bool override, const char* key, bool bursting, time_t TS)
 201 {
 202         if (!user || !cn)
 203                 return NULL;
 204
 205         char cname[MAXBUF];
 206         int MOD_RESULT = 0;
 207         std::string privs;
 208         Channel *Ptr;
 209
 210         /*
 211          * We don't restrict the number of channels that remote users or users that are override-joining may be in.
 212          * We restrict local users to MaxChans channels.
 213          * We restrict local operators to OperMaxChans channels.
 214          * This is a lot more logical than how it was formerly. -- w00t
 215          */
 216         if (IS_LOCAL(user) && !override)
 217         {
 218                 // Checking MyClass exists because we *may* get here with NULL, not 100% sure.
 219                 if (user->MyClass && user->MyClass->GetMaxChans())
 220                 {
 221                         if (user->chans.size() >= user->MyClass->GetMaxChans())
 222                         {
 223                                 user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 224                                 return NULL;
 225                         }
 226                 }
 227                 else
 228                 {
 229                         if (IS_OPER(user))
 230                         {
 231                                 if (user->chans.size() >= Instance->Config->OperMaxChans)
 232                                 {
 233                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 234                                         return NULL;
 235                                 }
 236                         }
 237                         else
 238                         {
 239                                 if (user->chans.size() >= Instance->Config->MaxChans)
 240                                 {
 241                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 242                                         return NULL;
 243                                 }
 244                         }
 245                 }
 246         }
 247
 248         strlcpy(cname, cn, Instance->Config->Limits.ChanMax);
 249         Ptr = Instance->FindChan(cname);
 250
 251         if (!Ptr)
 252         {
 253                 /*
 254                  * Fix: desync bug was here, don't set @ on remote users - spanningtree handles their permissions. bug #358. -- w00t
 255                  */
 256                 if (!IS_LOCAL(user))
 257                 {
 258                         if (!TS)
 259                                 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);
 260                 }
 261                 else
 262                 {
 263                         privs = "@";
 264                 }
 265
 266                 if (IS_LOCAL(user) && override == false)
 267                 {
 268                         MOD_RESULT = 0;
 269                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, NULL, cname, privs, key ? key : ""));
 270                         if (MOD_RESULT == 1)
 271                                 return NULL;
 272                 }
 273
 274                 Ptr = new Channel(Instance, cname, TS);
 275         }
 276         else
 277         {
 278                 /* Already on the channel */
 279                 if (Ptr->HasUser(user))
 280                         return NULL;
 281
 282                 /*
 283                  * remote users are allowed us to bypass channel modes
 284                  * and bans (used by servers)
 285                  */
 286                 if (IS_LOCAL(user) && override == false)
 287                 {
 288                         MOD_RESULT = 0;
 289                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, Ptr, cname, privs, key ? key : ""));
 290                         if (MOD_RESULT == 1)
 291                         {
 292                                 return NULL;
 293                         }
 294                         else if (MOD_RESULT == 0)
 295                         {
 296                                 std::string ckey = Ptr->GetModeParameter('k');
 297                                 if (!ckey.empty())
 298                                 {
 299                                         MOD_RESULT = 0;
 300                                         FOREACH_RESULT_I(Instance, I_OnCheckKey, OnCheckKey(user, Ptr, key ? key : ""));
 301                                         if (!MOD_RESULT)
 302                                         {
 303                                                 if ((!key) || ckey != key)
 304                                                 {
 305                                                         user->WriteNumeric(ERR_BADCHANNELKEY, "%s %s :Cannot join channel (Incorrect channel key)",user->nick.c_str(), Ptr->name.c_str());
 306                                                         return NULL;
 307                                                 }
 308                                         }
 309                                 }
 310                                 if (Ptr->IsModeSet('i'))
 311                                 {
 312                                         MOD_RESULT = 0;
 313                                         FOREACH_RESULT_I(Instance,I_OnCheckInvite,OnCheckInvite(user, Ptr));
 314                                         if (!MOD_RESULT)
 315                                         {
 316                                                 if (!user->IsInvited(Ptr->name.c_str()))
 317                                                 {
 318                                                         user->WriteNumeric(ERR_INVITEONLYCHAN, "%s %s :Cannot join channel (Invite only)",user->nick.c_str(), Ptr->name.c_str());
 319                                                         return NULL;
 320                                                 }
 321                                         }
 322                                         user->RemoveInvite(Ptr->name.c_str());
 323                                 }
 324
 325                                 std::string limit = Ptr->GetModeParameter('l');
 326                                 if (!limit.empty())
 327                                 {
 328                                         MOD_RESULT = 0;
 329                                         FOREACH_RESULT_I(Instance, I_OnCheckLimit, OnCheckLimit(user, Ptr));
 330                                         if (!MOD_RESULT)
 331                                         {
 332                                                 long llimit = atol(limit.c_str());
 333                                                 if (Ptr->GetUserCounter() >= llimit)
 334                                                 {
 335                                                         user->WriteNumeric(ERR_CHANNELISFULL, "%s %s :Cannot join channel (Channel is full)",user->nick.c_str(), Ptr->name.c_str());
 336                                                         return NULL;
 337                                                 }
 338                                         }
 339                                 }
 340
 341                                 if (Ptr->bans.size())
 342                                 {
 343                                         if (Ptr->IsBanned(user))
 344                                         {
 345                                                 user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s %s :Cannot join channel (You're banned)",user->nick.c_str(), Ptr->name.c_str());
 346                                                 return NULL;
 347                                         }
 348                                 }
 349                         }
 350                 }
 351         }
 352
 353         /* As spotted by jilles, dont bother to set this on remote users */
 354         if (IS_LOCAL(user) && Ptr->GetUserCounter() == 0)
 355                 Ptr->SetDefaultModes();
 356
 357         return Channel::ForceChan(Instance, Ptr, user, privs, bursting);
 358 }
 359
 360 Channel* Channel::ForceChan(InspIRCd* Instance, Channel* Ptr, User* user, const std::string &privs, bool bursting)
 361 {
 362         std::string nick = user->nick;
 363         bool silent = false;
 364
 365         Ptr->AddUser(user);
 366
 367         /* Just in case they have no permissions */
 368         user->chans[Ptr] = 0;
 369
 370         for (std::string::const_iterator x = privs.begin(); x != privs.end(); x++)
 371         {
 372                 const char status = *x;
 373                 ModeHandler* mh = Instance->Modes->FindPrefix(status);
 374                 if (mh)
 375                 {
 376                         /* Set, and make sure that the mode handler knows this mode was now set */
 377                         Ptr->SetPrefix(user, status, mh->GetPrefixRank(), true);
 378                         mh->OnModeChange(Instance->FakeClient, Instance->FakeClient, Ptr, nick, true);
 379
 380                         switch (mh->GetPrefix())
 381                         {
 382                                 /* These logic ops are SAFE IN THIS CASE because if the entry doesnt exist,
 383                                  * addressing operator[] creates it. If they do exist, it points to it.
 384                                  * At all other times where we dont want to create an item if it doesnt exist, we
 385                                  * must stick to ::find().
 386                                  */
 387                                 case '@':
 388                                         user->chans[Ptr] |= UCMODE_OP;
 389                                 break;
 390                                 case '%':
 391                                         user->chans[Ptr] |= UCMODE_HOP;
 392                                 break;
 393                                 case '+':
 394                                         user->chans[Ptr] |= UCMODE_VOICE;
 395                                 break;
 396                         }
 397                 }
 398         }
 399
 400         FOREACH_MOD_I(Instance,I_OnUserJoin,OnUserJoin(user, Ptr, bursting, silent));
 401
 402         if (!silent)
 403                 Ptr->WriteChannel(user,"JOIN :%s",Ptr->name.c_str());
 404
 405         /* Theyre not the first ones in here, make sure everyone else sees the modes we gave the user */
 406         std::string ms = Instance->Modes->ModeString(user, Ptr);
 407         if ((Ptr->GetUserCounter() > 1) && (ms.length()))
 408                 Ptr->WriteAllExceptSender(user, true, 0, "MODE %s +%s", Ptr->name.c_str(), ms.c_str());
 409
 410         /* Major improvement by Brain - we dont need to be calculating all this pointlessly for remote users */
 411         if (IS_LOCAL(user))
 412         {
 413                 if (Ptr->topicset)
 414                 {
 415                         user->WriteNumeric(RPL_TOPIC, "%s %s :%s", user->nick.c_str(), Ptr->name.c_str(), Ptr->topic.c_str());
 416                         user->WriteNumeric(RPL_TOPICTIME, "%s %s %s %lu", user->nick.c_str(), Ptr->name.c_str(), Ptr->setby.c_str(), (unsigned long)Ptr->topicset);
 417                 }
 418                 Ptr->UserList(user);
 419         }
 420         FOREACH_MOD_I(Instance,I_OnPostJoin,OnPostJoin(user, Ptr));
 421         return Ptr;
 422 }
 423
 424 bool Channel::IsBanned(User* user)
 425 {
 426         char mask[MAXBUF];
 427         int MOD_RESULT = 0;
 428         FOREACH_RESULT(I_OnCheckBan,OnCheckBan(user, this));
 429
 430         if (MOD_RESULT == -1)
 431                 return true;
 432         else if (MOD_RESULT == 0)
 433         {
 434                 snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 435                 for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 436                 {
 437                         /* This allows CIDR ban matching
 438                          *
 439                          *        Full masked host                      Full unmasked host                   IP with/without CIDR
 440                          */
 441                         if ((match(user->GetFullHost(),i->data)) || (match(user->GetFullRealHost(),i->data)) || (match(mask, i->data, true)))
 442                         {
 443                                 return true;
 444                         }
 445                 }
 446         }
 447         return false;
 448 }
 449
 450 bool Channel::IsExtBanned(const std::string &str, char type)
 451 {
 452         int MOD_RESULT = 0;
 453         FOREACH_RESULT(I_OnCheckStringExtBan, OnCheckStringExtBan(str, this, type));
 454
 455         if (MOD_RESULT == -1)
 456                 return true;
 457         else if (MOD_RESULT == 0)
 458         {
 459                 for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 460                 {
 461                         if (i->data[0] != type || i->data[1] != ':')
 462                                 continue;
 463
 464                         // Iterate past char and : to get to the mask without doing a data copy(!)
 465                         std::string maskptr = i->data.substr(2);
 466                         ServerInstance->Logs->Log("EXTBANS", DEBUG, "Checking %s against %s, type is %c", str.c_str(), maskptr.c_str(), type);
 467
 468                         if (match(str, maskptr))
 469                                 return true;
 470                 }
 471         }
 472
 473         return false;
 474 }
 475
 476 bool Channel::IsExtBanned(User *user, char type)
 477 {
 478         int MOD_RESULT = 0;
 479         FOREACH_RESULT(I_OnCheckExtBan, OnCheckExtBan(user, this, type));
 480
 481         if (MOD_RESULT == -1)
 482                 return true;
 483         else if (MOD_RESULT == 0)
 484         {
 485                 char mask[MAXBUF];
 486                 snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 487
 488                 // XXX: we should probably hook cloaked hosts in here somehow too..
 489                 if (this->IsExtBanned(mask, type))
 490                         return true;
 491
 492                 if (this->IsExtBanned(user->GetFullHost(), type))
 493                         return true;
 494
 495                 if (this->IsExtBanned(user->GetFullRealHost(), type))
 496                         return true;
 497         }
 498
 499         return false;
 500 }
 501
 502 /* Channel::PartUser
 503  * remove a channel from a users record, and return the number of users left.
 504  * Therefore, if this function returns 0 the caller should delete the Channel.
 505  *
 506  * XXX: bleh, string copy of reason, fixme! -- w00t
 507  */
 508 long Channel::PartUser(User *user, std::string &reason)
 509 {
 510         bool silent = false;
 511
 512         if (!user)
 513                 return this->GetUserCounter();
 514
 515         UCListIter i = user->chans.find(this);
 516         if (i != user->chans.end())
 517         {
 518                 FOREACH_MOD(I_OnUserPart,OnUserPart(user, this, reason, silent));
 519
 520                 if (!silent)
 521                         this->WriteChannel(user, "PART %s%s%s", this->name.c_str(), reason.empty() ? "" : " :", reason.c_str());
 522
 523                 user->chans.erase(i);
 524                 this->RemoveAllPrefixes(user);
 525         }
 526
 527         if (!this->DelUser(user)) /* if there are no users left on the channel... */
 528         {
 529                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 530                 /* kill the record */
 531                 if (iter != ServerInstance->chanlist->end())
 532                 {
 533                         int MOD_RESULT = 0;
 534                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 535                         if (MOD_RESULT == 1)
 536                                 return 1; // delete halted by module
 537                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 538                         ServerInstance->chanlist->erase(iter);
 539                 }
 540                 return 0;
 541         }
 542
 543         return this->GetUserCounter();
 544 }
 545
 546 long Channel::ServerKickUser(User* user, const char* reason, bool triggerevents, const char* servername)
 547 {
 548         bool silent = false;
 549
 550         if (!user || !reason)
 551                 return this->GetUserCounter();
 552
 553         if (IS_LOCAL(user))
 554         {
 555                 if (!this->HasUser(user))
 556                 {
 557                         /* Not on channel */
 558                         return this->GetUserCounter();
 559                 }
 560         }
 561
 562         if (servername == NULL || *ServerInstance->Config->HideWhoisServer)
 563                 servername = ServerInstance->Config->ServerName;
 564
 565         if (triggerevents)
 566         {
 567                 FOREACH_MOD(I_OnUserKick,OnUserKick(NULL, user, this, reason, silent));
 568         }
 569
 570         UCListIter i = user->chans.find(this);
 571         if (i != user->chans.end())
 572         {
 573                 if (!silent)
 574                         this->WriteChannelWithServ(servername, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 575
 576                 user->chans.erase(i);
 577                 this->RemoveAllPrefixes(user);
 578         }
 579
 580         if (!this->DelUser(user))
 581         {
 582                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 583                 /* kill the record */
 584                 if (iter != ServerInstance->chanlist->end())
 585                 {
 586                         int MOD_RESULT = 0;
 587                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 588                         if (MOD_RESULT == 1)
 589                                 return 1; // delete halted by module
 590                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 591                         ServerInstance->chanlist->erase(iter);
 592                 }
 593                 return 0;
 594         }
 595
 596         return this->GetUserCounter();
 597 }
 598
 599 long Channel::KickUser(User *src, User *user, const char* reason)
 600 {
 601         bool silent = false;
 602
 603         if (!src || !user || !reason)
 604                 return this->GetUserCounter();
 605
 606         if (IS_LOCAL(src))
 607         {
 608                 if (!this->HasUser(user))
 609                 {
 610                         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());
 611                         return this->GetUserCounter();
 612                 }
 613                 if ((ServerInstance->ULine(user->server)) && (!ServerInstance->ULine(src->server)))
 614                 {
 615                         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());
 616                         return this->GetUserCounter();
 617                 }
 618                 int MOD_RESULT = 0;
 619
 620                 if (!ServerInstance->ULine(src->server))
 621                 {
 622                         MOD_RESULT = 0;
 623                         FOREACH_RESULT(I_OnUserPreKick,OnUserPreKick(src,user,this,reason));
 624                         if (MOD_RESULT == 1)
 625                                 return this->GetUserCounter();
 626                 }
 627                 /* Set to -1 by OnUserPreKick if explicit allow was set */
 628                 if (MOD_RESULT != -1)
 629                 {
 630                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(src,user,this,AC_KICK));
 631                         if ((MOD_RESULT == ACR_DENY) && (!ServerInstance->ULine(src->server)))
 632                                 return this->GetUserCounter();
 633
 634                         if ((MOD_RESULT == ACR_DEFAULT) || (!ServerInstance->ULine(src->server)))
 635                         {
 636                                 int them = this->GetStatus(src);
 637                                 int us = this->GetStatus(user);
 638                                 if ((them < STATUS_HOP) || (them < us))
 639                                 {
 640                                         src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :You must be a channel %soperator",src->nick.c_str(), this->name.c_str(), them == STATUS_HOP ? "" : "half-");
 641                                         return this->GetUserCounter();
 642                                 }
 643                         }
 644                 }
 645         }
 646
 647         FOREACH_MOD(I_OnUserKick,OnUserKick(src, user, this, reason, silent));
 648
 649         UCListIter i = user->chans.find(this);
 650         if (i != user->chans.end())
 651         {
 652                 /* zap it from the channel list of the user */
 653                 if (!silent)
 654                         this->WriteChannel(src, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 655
 656                 user->chans.erase(i);
 657                 this->RemoveAllPrefixes(user);
 658         }
 659
 660         if (!this->DelUser(user))
 661         /* if there are no users left on the channel */
 662         {
 663                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name.c_str());
 664
 665                 /* kill the record */
 666                 if (iter != ServerInstance->chanlist->end())
 667                 {
 668                         int MOD_RESULT = 0;
 669                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 670                         if (MOD_RESULT == 1)
 671                                 return 1; // delete halted by module
 672                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 673                         ServerInstance->chanlist->erase(iter);
 674                 }
 675                 return 0;
 676         }
 677
 678         return this->GetUserCounter();
 679 }
 680
 681 void Channel::WriteChannel(User* user, const char* text, ...)
 682 {
 683         char textbuffer[MAXBUF];
 684         va_list argsPtr;
 685
 686         if (!user || !text)
 687                 return;
 688
 689         va_start(argsPtr, text);
 690         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 691         va_end(argsPtr);
 692
 693         this->WriteChannel(user, std::string(textbuffer));
 694 }
 695
 696 void Channel::WriteChannel(User* user, const std::string &text)
 697 {
 698         CUList *ulist = this->GetUsers();
 699         char tb[MAXBUF];
 700
 701         if (!user)
 702                 return;
 703
 704         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 705         std::string out = tb;
 706
 707         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 708         {
 709                 if (IS_LOCAL(i->first))
 710                         i->first->Write(out);
 711         }
 712 }
 713
 714 void Channel::WriteChannelWithServ(const char* ServName, const char* text, ...)
 715 {
 716         char textbuffer[MAXBUF];
 717         va_list argsPtr;
 718
 719         if (!text)
 720                 return;
 721
 722         va_start(argsPtr, text);
 723         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 724         va_end(argsPtr);
 725
 726         this->WriteChannelWithServ(ServName, std::string(textbuffer));
 727 }
 728
 729 void Channel::WriteChannelWithServ(const char* ServName, const std::string &text)
 730 {
 731         CUList *ulist = this->GetUsers();
 732         char tb[MAXBUF];
 733
 734         snprintf(tb,MAXBUF,":%s %s", ServName ? ServName : ServerInstance->Config->ServerName, text.c_str());
 735         std::string out = tb;
 736
 737         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 738         {
 739                 if (IS_LOCAL(i->first))
 740                         i->first->Write(out);
 741         }
 742 }
 743
 744 /* write formatted text from a source user to all users on a channel except
 745  * for the sender (for privmsg etc) */
 746 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const char* text, ...)
 747 {
 748         char textbuffer[MAXBUF];
 749         va_list argsPtr;
 750
 751         if (!text)
 752                 return;
 753
 754         va_start(argsPtr, text);
 755         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 756         va_end(argsPtr);
 757
 758         this->WriteAllExceptSender(user, serversource, status, std::string(textbuffer));
 759 }
 760
 761 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const char* text, ...)
 762 {
 763         char textbuffer[MAXBUF];
 764         va_list argsPtr;
 765
 766         if (!text)
 767                 return;
 768
 769         va_start(argsPtr, text);
 770         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 771         va_end(argsPtr);
 772
 773         this->WriteAllExcept(user, serversource, status, except_list, std::string(textbuffer));
 774 }
 775
 776 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &text)
 777 {
 778         CUList *ulist = this->GetUsers();
 779         char tb[MAXBUF];
 780
 781         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 782         std::string out = tb;
 783
 784         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 785         {
 786                 if ((IS_LOCAL(i->first)) && (except_list.find(i->first) == except_list.end()))
 787                 {
 788                         /* User doesnt have the status we're after */
 789                         if (status && !strchr(this->GetAllPrefixChars(i->first), status))
 790                                 continue;
 791
 792                         if (serversource)
 793                                 i->first->WriteServ(text);
 794                         else
 795                                 i->first->Write(out);
 796                 }
 797         }
 798 }
 799
 800 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const std::string& text)
 801 {
 802         CUList except_list;
 803         except_list[user] = user->nick;
 804         this->WriteAllExcept(user, serversource, status, except_list, std::string(text));
 805 }
 806
 807 /*
 808  * return a count of the users on a specific channel accounting for
 809  * invisible users who won't increase the count. e.g. for /LIST
 810  */
 811 int Channel::CountInvisible()
 812 {
 813         int count = 0;
 814         CUList *ulist= this->GetUsers();
 815         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 816         {
 817                 if (!(i->first->IsModeSet('i')))
 818                         count++;
 819         }
 820
 821         return count;
 822 }
 823
 824 char* Channel::ChanModes(bool showkey)
 825 {
 826         static char scratch[MAXBUF];
 827         static char sparam[MAXBUF];
 828         char* offset = scratch;
 829         std::string extparam;
 830
 831         *scratch = '\0';
 832         *sparam = '\0';
 833
 834         /* This was still iterating up to 190, Channel::modes is only 64 elements -- Om */
 835         for(int n = 0; n < 64; n++)
 836         {
 837                 if(this->modes[n])
 838                 {
 839                         *offset++ = n + 65;
 840                         extparam.clear();
 841                         switch (n)
 842                         {
 843                                 case CM_KEY:
 844                                         // Unfortunately this must be special-cased, as we definitely don't want to always display key.
 845                                         if (showkey)
 846                                         {
 847                                                 extparam = this->GetModeParameter('k');
 848                                         }
 849                                         else
 850                                         {
 851                                                 extparam = "<key>";
 852                                         }
 853                                         break;
 854                                 case CM_NOEXTERNAL:
 855                                 case CM_TOPICLOCK:
 856                                 case CM_INVITEONLY:
 857                                 case CM_MODERATED:
 858                                 case CM_SECRET:
 859                                 case CM_PRIVATE:
 860                                         /* We know these have no parameters */
 861                                 break;
 862                                 default:
 863                                         extparam = this->GetModeParameter(n + 65);
 864                                 break;
 865                         }
 866                         if (!extparam.empty())
 867                         {
 868                                 charlcat(sparam,' ',MAXBUF);
 869                                 strlcat(sparam,extparam.c_str(),MAXBUF);
 870                         }
 871                 }
 872         }
 873
 874         /* Null terminate scratch */
 875         *offset = '\0';
 876         strlcat(scratch,sparam,MAXBUF);
 877         return scratch;
 878 }
 879
 880 /* compile a userlist of a channel into a string, each nick seperated by
 881  * spaces and op, voice etc status shown as @ and +, and send it to 'user'
 882  */
 883 void Channel::UserList(User *user, CUList *ulist)
 884 {
 885         char list[MAXBUF];
 886         size_t dlen, curlen;
 887         int MOD_RESULT = 0;
 888         bool call_modules = true;
 889
 890         if (!IS_LOCAL(user))
 891                 return;
 892
 893         FOREACH_RESULT(I_OnUserList,OnUserList(user, this, ulist));
 894         if (MOD_RESULT == 1)
 895                 call_modules = false;
 896
 897         if (MOD_RESULT != -1)
 898         {
 899                 if ((this->IsModeSet('s')) && (!this->HasUser(user)))
 900                 {
 901                         user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel",user->nick.c_str(), this->name.c_str());
 902                         return;
 903                 }
 904         }
 905
 906         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=',  this->name.c_str());
 907
 908         int numusers = 0;
 909         char* ptr = list + dlen;
 910
 911         if (!ulist)
 912                 ulist = this->GetUsers();
 913
 914         /* Improvement by Brain - this doesnt change in value, so why was it inside
 915          * the loop?
 916          */
 917         bool has_user = this->HasUser(user);
 918
 919         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 920         {
 921                 if ((!has_user) && (i->first->IsModeSet('i')))
 922                 {
 923                         /*
 924                          * user is +i, and source not on the channel, does not show
 925                          * nick in NAMES list
 926                          */
 927                         continue;
 928                 }
 929
 930                 if (i->first->Visibility && !i->first->Visibility->VisibleTo(user))
 931                         continue;
 932
 933                 std::string prefixlist = this->GetPrefixChar(i->first);
 934                 std::string nick = i->first->nick;
 935
 936                 if (call_modules)
 937                 {
 938                         FOREACH_MOD(I_OnNamesListItem, OnNamesListItem(user, i->first, this, prefixlist, nick));
 939
 940                         /* Nick was nuked, a module wants us to skip it */
 941                         if (nick.empty())
 942                                 continue;
 943                 }
 944
 945                 size_t ptrlen = 0;
 946
 947                 if (curlen + prefixlist.length() + nick.length() + 1 > 480)
 948                 {
 949                         /* list overflowed into multiple numerics */
 950                         user->WriteServ(std::string(list));
 951
 952                         /* reset our lengths */
 953                         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=', this->name.c_str());
 954                         ptr = list + dlen;
 955
 956                         ptrlen = 0;
 957                         numusers = 0;
 958                 }
 959
 960                 ptrlen = snprintf(ptr, MAXBUF, "%s%s ", prefixlist.c_str(), nick.c_str());
 961
 962                 curlen += ptrlen;
 963                 ptr += ptrlen;
 964
 965                 numusers++;
 966         }
 967
 968         /* if whats left in the list isnt empty, send it */
 969         if (numusers)
 970         {
 971                 user->WriteNumeric(RPL_NAMREPLY, std::string(list));
 972         }
 973
 974         user->WriteNumeric(RPL_ENDOFNAMES, "%s %s :End of /NAMES list.", user->nick.c_str(), this->name.c_str());
 975 }
 976
 977 long Channel::GetMaxBans()
 978 {
 979         /* Return the cached value if there is one */
 980         if (this->maxbans)
 981                 return this->maxbans;
 982
 983         /* If there isnt one, we have to do some O(n) hax to find it the first time. (ick) */
 984         for (std::map<std::string,int>::iterator n = ServerInstance->Config->maxbans.begin(); n != ServerInstance->Config->maxbans.end(); n++)
 985         {
 986                 if (match(this->name,n->first))
 987                 {
 988                         this->maxbans = n->second;
 989                         return n->second;
 990                 }
 991         }
 992
 993         /* Screw it, just return the default of 64 */
 994         this->maxbans = 64;
 995         return this->maxbans;
 996 }
 997
 998 void Channel::ResetMaxBans()
 999 {
1000         this->maxbans = 0;
1001 }
1002
1003 /* returns the status character for a given user on a channel, e.g. @ for op,
1004  * % for halfop etc. If the user has several modes set, the highest mode
1005  * the user has must be returned.
1006  */
1007 const char* Channel::GetPrefixChar(User *user)
1008 {
1009         static char pf[2] = {0, 0};
1010
1011         prefixlist::iterator n = prefixes.find(user);
1012         if (n != prefixes.end())
1013         {
1014                 if (n->second.size())
1015                 {
1016                         /* If the user has any prefixes, their highest prefix
1017                          * will always be at the head of the list, as the list is
1018                          * sorted in rank order highest first (see SetPrefix()
1019                          * for reasons why)
1020                          */
1021                         *pf = n->second.begin()->first;
1022                         return pf;
1023                 }
1024         }
1025
1026         *pf = 0;
1027         return pf;
1028 }
1029
1030
1031 const char* Channel::GetAllPrefixChars(User* user)
1032 {
1033         static char prefix[MAXBUF];
1034         int ctr = 0;
1035         *prefix = 0;
1036
1037         prefixlist::iterator n = prefixes.find(user);
1038         if (n != prefixes.end())
1039         {
1040                 for (std::vector<prefixtype>::iterator x = n->second.begin(); x != n->second.end(); x++)
1041                 {
1042                         prefix[ctr++] = x->first;
1043                 }
1044         }
1045
1046         prefix[ctr] = 0;
1047
1048         return prefix;
1049 }
1050
1051 unsigned int Channel::GetPrefixValue(User* user)
1052 {
1053         prefixlist::iterator n = prefixes.find(user);
1054         if (n != prefixes.end())
1055         {
1056                 if (n->second.size())
1057                         return n->second.begin()->second;
1058         }
1059         return 0;
1060 }
1061
1062 int Channel::GetStatusFlags(User *user)
1063 {
1064         UCListIter i = user->chans.find(this);
1065         if (i != user->chans.end())
1066         {
1067                 return i->second;
1068         }
1069         return 0;
1070 }
1071
1072 int Channel::GetStatus(User *user)
1073 {
1074         if (ServerInstance->ULine(user->server))
1075                 return STATUS_OP;
1076
1077         UCListIter i = user->chans.find(this);
1078         if (i != user->chans.end())
1079         {
1080                 if ((i->second & UCMODE_OP) > 0)
1081                 {
1082                         return STATUS_OP;
1083                 }
1084                 if ((i->second & UCMODE_HOP) > 0)
1085                 {
1086                         return STATUS_HOP;
1087                 }
1088                 if ((i->second & UCMODE_VOICE) > 0)
1089                 {
1090                         return STATUS_VOICE;
1091                 }
1092                 return STATUS_NORMAL;
1093         }
1094         return STATUS_NORMAL;
1095 }
1096
1097 void Channel::SetPrefix(User* user, char prefix, unsigned int prefix_value, bool adding)
1098 {
1099         prefixlist::iterator n = prefixes.find(user);
1100         prefixtype pfx = std::make_pair(prefix,prefix_value);
1101         if (adding)
1102         {
1103                 if (n != prefixes.end())
1104                 {
1105                         if (std::find(n->second.begin(), n->second.end(), pfx) == n->second.end())
1106                         {
1107                                 n->second.push_back(pfx);
1108                                 /* We must keep prefixes in rank order, largest first.
1109                                  * This is for two reasons, firstly because x-chat *ass-u-me's* this
1110                                  * state, and secondly it turns out to be a benefit to us later.
1111                                  * See above in GetPrefix().
1112                                  */
1113                                 std::sort(n->second.begin(), n->second.end(), ModeParser::PrefixComparison);
1114                         }
1115                 }
1116                 else
1117                 {
1118                         pfxcontainer one;
1119                         one.push_back(pfx);
1120                         prefixes.insert(std::make_pair<User*,pfxcontainer>(user, one));
1121                 }
1122         }
1123         else
1124         {
1125                 if (n != prefixes.end())
1126                 {
1127                         pfxcontainer::iterator x = std::find(n->second.begin(), n->second.end(), pfx);
1128                         if (x != n->second.end())
1129                                 n->second.erase(x);
1130                 }
1131         }
1132 }
1133
1134 void Channel::RemoveAllPrefixes(User* user)
1135 {
1136         prefixlist::iterator n = prefixes.find(user);
1137         if (n != prefixes.end())
1138         {
1139                 prefixes.erase(n);
1140         }
1141 }
1142