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