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 */
  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 int Channel::SetTopic(User *u, std::string &ntopic, bool forceset)
  77 {
  78         if (IS_LOCAL(u))
  79         {
  80                 if(!forceset)
  81                 {
  82                         int MOD_RESULT = 0;
  83                         /* 0: check status, 1: don't, -1: disallow change silently */
  84
  85                         FOREACH_RESULT(I_OnLocalTopicChange,OnLocalTopicChange(u,this,ntopic));
  86
  87                         if (MOD_RESULT == 1)
  88                                 return CMD_FAILURE;
  89                         else if (MOD_RESULT == 0)
  90                         {
  91                                 if (!this->HasUser(u))
  92                                 {
  93                                         u->WriteNumeric(442, "%s %s :You're not on that channel!",u->nick.c_str(), this->name.c_str());
  94                                         return CMD_FAILURE;
  95                                 }
  96                                 if ((this->IsModeSet('t')) && (this->GetStatus(u) < STATUS_HOP))
  97                                 {
  98                                         u->WriteNumeric(482, "%s %s :You must be at least a half-operator to change the topic on this channel", u->nick.c_str(), this->name.c_str());
  99                                         return CMD_FAILURE;
 100                                 }
 101                         }
 102                 }
 103
 104                 this->topic.assign(ntopic, 0, ServerInstance->Config->Limits.MaxTopic);
 105         }
 106
 107         this->setby.assign(ServerInstance->Config->FullHostInTopic ? u->GetFullHost() : u->nick, 0, 128);
 108         this->topicset = ServerInstance->Time();
 109         this->WriteChannel(u, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
 110
 111         if (IS_LOCAL(u))
 112         {
 113                 FOREACH_MOD(I_OnPostLocalTopicChange,OnPostLocalTopicChange(u, this, this->topic));
 114         }
 115
 116         return CMD_SUCCESS;
 117 }
 118
 119 long Channel::GetUserCounter()
 120 {
 121         return (this->internal_userlist.size());
 122 }
 123
 124 void Channel::AddUser(User* user)
 125 {
 126         internal_userlist[user] = user->nick;
 127 }
 128
 129 unsigned long Channel::DelUser(User* user)
 130 {
 131         CUListIter a = internal_userlist.find(user);
 132
 133         if (a != internal_userlist.end())
 134         {
 135                 internal_userlist.erase(a);
 136                 /* And tidy any others... */
 137                 DelOppedUser(user);
 138                 DelHalfoppedUser(user);
 139                 DelVoicedUser(user);
 140         }
 141
 142         return internal_userlist.size();
 143 }
 144
 145 bool Channel::HasUser(User* user)
 146 {
 147         return (internal_userlist.find(user) != internal_userlist.end());
 148 }
 149
 150 void Channel::AddOppedUser(User* user)
 151 {
 152         internal_op_userlist[user] = user->nick;
 153 }
 154
 155 void Channel::DelOppedUser(User* user)
 156 {
 157         CUListIter a = internal_op_userlist.find(user);
 158         if (a != internal_op_userlist.end())
 159         {
 160                 internal_op_userlist.erase(a);
 161                 return;
 162         }
 163 }
 164
 165 void Channel::AddHalfoppedUser(User* user)
 166 {
 167         internal_halfop_userlist[user] = user->nick;
 168 }
 169
 170 void Channel::DelHalfoppedUser(User* user)
 171 {
 172         CUListIter a = internal_halfop_userlist.find(user);
 173
 174         if (a != internal_halfop_userlist.end())
 175         {
 176                 internal_halfop_userlist.erase(a);
 177         }
 178 }
 179
 180 void Channel::AddVoicedUser(User* user)
 181 {
 182         internal_voice_userlist[user] = user->nick;
 183 }
 184
 185 void Channel::DelVoicedUser(User* user)
 186 {
 187         CUListIter a = internal_voice_userlist.find(user);
 188
 189         if (a != internal_voice_userlist.end())
 190         {
 191                 internal_voice_userlist.erase(a);
 192         }
 193 }
 194
 195 CUList* Channel::GetUsers()
 196 {
 197         return &internal_userlist;
 198 }
 199
 200 CUList* Channel::GetOppedUsers()
 201 {
 202         return &internal_op_userlist;
 203 }
 204
 205 CUList* Channel::GetHalfoppedUsers()
 206 {
 207         return &internal_halfop_userlist;
 208 }
 209
 210 CUList* Channel::GetVoicedUsers()
 211 {
 212         return &internal_voice_userlist;
 213 }
 214
 215 void Channel::SetDefaultModes()
 216 {
 217         ServerInstance->Logs->Log("CHANNELS", DEBUG, "SetDefaultModes %s", ServerInstance->Config->DefaultModes);
 218         irc::spacesepstream list(ServerInstance->Config->DefaultModes);
 219         std::string modeseq;
 220         std::string parameter;
 221
 222         list.GetToken(modeseq);
 223
 224         for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 225         {
 226                 ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 227                 if (mode)
 228                 {
 229                         if (mode->GetNumParams(true))
 230                                 list.GetToken(parameter);
 231                         else
 232                                 parameter.clear();
 233
 234                         mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, this, parameter, true);
 235                 }
 236         }
 237 }
 238
 239 /*
 240  * add a channel to a user, creating the record for it if needed and linking
 241  * it to the user record
 242  */
 243 Channel* Channel::JoinUser(InspIRCd* Instance, User *user, const char* cn, bool override, const char* key, bool bursting, time_t TS)
 244 {
 245         if (!user || !cn)
 246                 return NULL;
 247
 248         char cname[MAXBUF];
 249         int MOD_RESULT = 0;
 250         std::string privs;
 251         Channel *Ptr;
 252
 253         /*
 254          * We don't restrict the number of channels that remote users or users that are override-joining may be in.
 255          * We restrict local users to MaxChans channels.
 256          * We restrict local operators to OperMaxChans channels.
 257          * This is a lot more logical than how it was formerly. -- w00t
 258          */
 259         if (IS_LOCAL(user) && !override)
 260         {
 261                 // Checking MyClass exists because we *may* get here with NULL, not 100% sure.
 262                 if (user->MyClass && user->MyClass->GetMaxChans())
 263                 {
 264                         if (user->chans.size() >= user->MyClass->GetMaxChans())
 265                         {
 266                                 user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 267                                 return NULL;
 268                         }
 269                 }
 270                 else
 271                 {
 272                         if (IS_OPER(user))
 273                         {
 274                                 if (user->chans.size() >= Instance->Config->OperMaxChans)
 275                                 {
 276                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 277                                         return NULL;
 278                                 }
 279                         }
 280                         else
 281                         {
 282                                 if (user->chans.size() >= Instance->Config->MaxChans)
 283                                 {
 284                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 285                                         return NULL;
 286                                 }
 287                         }
 288                 }
 289         }
 290
 291         strlcpy(cname, cn, Instance->Config->Limits.ChanMax);
 292         Ptr = Instance->FindChan(cname);
 293
 294         if (!Ptr)
 295         {
 296                 /*
 297                  * Fix: desync bug was here, don't set @ on remote users - spanningtree handles their permissions. bug #358. -- w00t
 298                  */
 299                 if (!IS_LOCAL(user))
 300                 {
 301                         if (!TS)
 302                                 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);
 303                 }
 304                 else
 305                 {
 306                         privs = "@";
 307                 }
 308
 309                 if (IS_LOCAL(user) && override == false)
 310                 {
 311                         MOD_RESULT = 0;
 312                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, NULL, cname, privs, key ? key : ""));
 313                         if (MOD_RESULT == 1)
 314                                 return NULL;
 315                 }
 316
 317                 Ptr = new Channel(Instance, cname, TS);
 318         }
 319         else
 320         {
 321                 /* Already on the channel */
 322                 if (Ptr->HasUser(user))
 323                         return NULL;
 324
 325                 /*
 326                  * remote users are allowed us to bypass channel modes
 327                  * and bans (used by servers)
 328                  */
 329                 if (IS_LOCAL(user) && override == false)
 330                 {
 331                         MOD_RESULT = 0;
 332                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, Ptr, cname, privs, key ? key : ""));
 333                         if (MOD_RESULT == 1)
 334                         {
 335                                 return NULL;
 336                         }
 337                         else if (MOD_RESULT == 0)
 338                         {
 339                                 std::string ckey = Ptr->GetModeParameter('k');
 340                                 if (!ckey.empty())
 341                                 {
 342                                         MOD_RESULT = 0;
 343                                         FOREACH_RESULT_I(Instance, I_OnCheckKey, OnCheckKey(user, Ptr, key ? key : ""));
 344                                         if (!MOD_RESULT)
 345                                         {
 346                                                 if ((!key) || ckey != key)
 347                                                 {
 348                                                         user->WriteNumeric(ERR_BADCHANNELKEY, "%s %s :Cannot join channel (Incorrect channel key)",user->nick.c_str(), Ptr->name.c_str());
 349                                                         return NULL;
 350                                                 }
 351                                         }
 352                                 }
 353                                 if (Ptr->IsModeSet('i'))
 354                                 {
 355                                         MOD_RESULT = 0;
 356                                         FOREACH_RESULT_I(Instance,I_OnCheckInvite,OnCheckInvite(user, Ptr));
 357                                         if (!MOD_RESULT)
 358                                         {
 359                                                 if (!user->IsInvited(Ptr->name.c_str()))
 360                                                 {
 361                                                         user->WriteNumeric(ERR_INVITEONLYCHAN, "%s %s :Cannot join channel (Invite only)",user->nick.c_str(), Ptr->name.c_str());
 362                                                         return NULL;
 363                                                 }
 364                                         }
 365                                         user->RemoveInvite(Ptr->name.c_str());
 366                                 }
 367
 368                                 std::string limit = Ptr->GetModeParameter('l');
 369                                 if (!limit.empty())
 370                                 {
 371                                         MOD_RESULT = 0;
 372                                         FOREACH_RESULT_I(Instance, I_OnCheckLimit, OnCheckLimit(user, Ptr));
 373                                         if (!MOD_RESULT)
 374                                         {
 375                                                 long llimit = atol(limit.c_str());
 376                                                 if (Ptr->GetUserCounter() >= llimit)
 377                                                 {
 378                                                         user->WriteNumeric(ERR_CHANNELISFULL, "%s %s :Cannot join channel (Channel is full)",user->nick.c_str(), Ptr->name.c_str());
 379                                                         return NULL;
 380                                                 }
 381                                         }
 382                                 }
 383
 384                                 if (Ptr->bans.size())
 385                                 {
 386                                         if (Ptr->IsBanned(user))
 387                                         {
 388                                                 user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s %s :Cannot join channel (You're banned)",user->nick.c_str(), Ptr->name.c_str());
 389                                                 return NULL;
 390                                         }
 391                                 }
 392                         }
 393                 }
 394         }
 395
 396         /* As spotted by jilles, dont bother to set this on remote users */
 397         if (IS_LOCAL(user) && Ptr->GetUserCounter() == 0)
 398                 Ptr->SetDefaultModes();
 399
 400         return Channel::ForceChan(Instance, Ptr, user, privs, bursting);
 401 }
 402
 403 Channel* Channel::ForceChan(InspIRCd* Instance, Channel* Ptr, User* user, const std::string &privs, bool bursting)
 404 {
 405         std::string nick = user->nick;
 406         bool silent = false;
 407
 408         Ptr->AddUser(user);
 409
 410         /* Just in case they have no permissions */
 411         user->chans[Ptr] = 0;
 412
 413         for (std::string::const_iterator x = privs.begin(); x != privs.end(); x++)
 414         {
 415                 const char status = *x;
 416                 ModeHandler* mh = Instance->Modes->FindPrefix(status);
 417                 if (mh)
 418                 {
 419                         /* Set, and make sure that the mode handler knows this mode was now set */
 420                         Ptr->SetPrefix(user, status, mh->GetPrefixRank(), true);
 421                         mh->OnModeChange(Instance->FakeClient, Instance->FakeClient, Ptr, nick, true);
 422
 423                         switch (mh->GetPrefix())
 424                         {
 425                                 /* These logic ops are SAFE IN THIS CASE because if the entry doesnt exist,
 426                                  * addressing operator[] creates it. If they do exist, it points to it.
 427                                  * At all other times where we dont want to create an item if it doesnt exist, we
 428                                  * must stick to ::find().
 429                                  */
 430                                 case '@':
 431                                         user->chans[Ptr] |= UCMODE_OP;
 432                                 break;
 433                                 case '%':
 434                                         user->chans[Ptr] |= UCMODE_HOP;
 435                                 break;
 436                                 case '+':
 437                                         user->chans[Ptr] |= UCMODE_VOICE;
 438                                 break;
 439                         }
 440                 }
 441         }
 442
 443         FOREACH_MOD_I(Instance,I_OnUserJoin,OnUserJoin(user, Ptr, bursting, silent));
 444
 445         if (!silent)
 446                 Ptr->WriteChannel(user,"JOIN :%s",Ptr->name.c_str());
 447
 448         /* Theyre not the first ones in here, make sure everyone else sees the modes we gave the user */
 449         std::string ms = Instance->Modes->ModeString(user, Ptr);
 450         if ((Ptr->GetUserCounter() > 1) && (ms.length()))
 451                 Ptr->WriteAllExceptSender(user, true, 0, "MODE %s +%s", Ptr->name.c_str(), ms.c_str());
 452
 453         /* Major improvement by Brain - we dont need to be calculating all this pointlessly for remote users */
 454         if (IS_LOCAL(user))
 455         {
 456                 if (Ptr->topicset)
 457                 {
 458                         user->WriteNumeric(RPL_TOPIC, "%s %s :%s", user->nick.c_str(), Ptr->name.c_str(), Ptr->topic.c_str());
 459                         user->WriteNumeric(RPL_TOPICTIME, "%s %s %s %lu", user->nick.c_str(), Ptr->name.c_str(), Ptr->setby.c_str(), (unsigned long)Ptr->topicset);
 460                 }
 461                 Ptr->UserList(user);
 462         }
 463         FOREACH_MOD_I(Instance,I_OnPostJoin,OnPostJoin(user, Ptr));
 464         return Ptr;
 465 }
 466
 467 bool Channel::IsBanned(User* user)
 468 {
 469         char mask[MAXBUF];
 470         int MOD_RESULT = 0;
 471         FOREACH_RESULT(I_OnCheckBan,OnCheckBan(user, this));
 472
 473         if (MOD_RESULT == -1)
 474                 return true;
 475         else if (MOD_RESULT == 0)
 476         {
 477                 snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 478                 for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 479                 {
 480                         /* This allows CIDR ban matching
 481                          *
 482                          *        Full masked host                      Full unmasked host                   IP with/without CIDR
 483                          */
 484                         if ((match(user->GetFullHost(),i->data)) || (match(user->GetFullRealHost(),i->data)) || (match(mask, i->data, true)))
 485                         {
 486                                 return true;
 487                         }
 488                 }
 489         }
 490         return false;
 491 }
 492
 493 bool Channel::IsExtBanned(const std::string &str, char type)
 494 {
 495         int MOD_RESULT = 0;
 496         FOREACH_RESULT(I_OnCheckStringExtBan, OnCheckStringExtBan(str, this, type));
 497
 498         if (MOD_RESULT == -1)
 499                 return true;
 500         else if (MOD_RESULT == 0)
 501         {
 502                 for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 503                 {
 504                         if (i->data[0] != type || i->data[1] != ':')
 505                                 continue;
 506
 507                         // Iterate past char and : to get to the mask without doing a data copy(!)
 508                         std::string maskptr = i->data.substr(2);
 509                         ServerInstance->Logs->Log("EXTBANS", DEBUG, "Checking %s against %s, type is %c", str.c_str(), maskptr.c_str(), type);
 510
 511                         if (match(str, maskptr))
 512                                 return true;
 513                 }
 514         }
 515
 516         return false;
 517 }
 518
 519 bool Channel::IsExtBanned(User *user, char type)
 520 {
 521         int MOD_RESULT = 0;
 522         FOREACH_RESULT(I_OnCheckExtBan, OnCheckExtBan(user, this, type));
 523
 524         if (MOD_RESULT == -1)
 525                 return true;
 526         else if (MOD_RESULT == 0)
 527         {
 528                 char mask[MAXBUF];
 529                 snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 530
 531                 // XXX: we should probably hook cloaked hosts in here somehow too..
 532                 if (this->IsExtBanned(mask, type))
 533                         return true;
 534
 535                 if (this->IsExtBanned(user->GetFullHost(), type))
 536                         return true;
 537
 538                 if (this->IsExtBanned(user->GetFullRealHost(), type))
 539                         return true;
 540         }
 541
 542         return false;
 543 }
 544
 545 /* Channel::PartUser
 546  * remove a channel from a users record, and return the number of users left.
 547  * Therefore, if this function returns 0 the caller should delete the Channel.
 548  *
 549  * XXX: bleh, string copy of reason, fixme! -- w00t
 550  */
 551 long Channel::PartUser(User *user, std::string &reason)
 552 {
 553         bool silent = false;
 554
 555         if (!user)
 556                 return this->GetUserCounter();
 557
 558         UCListIter i = user->chans.find(this);
 559         if (i != user->chans.end())
 560         {
 561                 FOREACH_MOD(I_OnUserPart,OnUserPart(user, this, reason, silent));
 562
 563                 if (!silent)
 564                         this->WriteChannel(user, "PART %s%s%s", this->name.c_str(), reason.empty() ? "" : " :", reason.c_str());
 565
 566                 user->chans.erase(i);
 567                 this->RemoveAllPrefixes(user);
 568         }
 569
 570         if (!this->DelUser(user)) /* if there are no users left on the channel... */
 571         {
 572                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 573                 /* kill the record */
 574                 if (iter != ServerInstance->chanlist->end())
 575                 {
 576                         int MOD_RESULT = 0;
 577                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 578                         if (MOD_RESULT == 1)
 579                                 return 1; // delete halted by module
 580                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 581                         ServerInstance->chanlist->erase(iter);
 582                 }
 583                 return 0;
 584         }
 585
 586         return this->GetUserCounter();
 587 }
 588
 589 long Channel::ServerKickUser(User* user, const char* reason, bool triggerevents, const char* servername)
 590 {
 591         bool silent = false;
 592
 593         if (!user || !reason)
 594                 return this->GetUserCounter();
 595
 596         if (IS_LOCAL(user))
 597         {
 598                 if (!this->HasUser(user))
 599                 {
 600                         /* Not on channel */
 601                         return this->GetUserCounter();
 602                 }
 603         }
 604
 605         if (servername == NULL || *ServerInstance->Config->HideWhoisServer)
 606                 servername = ServerInstance->Config->ServerName;
 607
 608         if (triggerevents)
 609         {
 610                 FOREACH_MOD(I_OnUserKick,OnUserKick(NULL, user, this, reason, silent));
 611         }
 612
 613         UCListIter i = user->chans.find(this);
 614         if (i != user->chans.end())
 615         {
 616                 if (!silent)
 617                         this->WriteChannelWithServ(servername, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 618
 619                 user->chans.erase(i);
 620                 this->RemoveAllPrefixes(user);
 621         }
 622
 623         if (!this->DelUser(user))
 624         {
 625                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 626                 /* kill the record */
 627                 if (iter != ServerInstance->chanlist->end())
 628                 {
 629                         int MOD_RESULT = 0;
 630                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 631                         if (MOD_RESULT == 1)
 632                                 return 1; // delete halted by module
 633                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 634                         ServerInstance->chanlist->erase(iter);
 635                 }
 636                 return 0;
 637         }
 638
 639         return this->GetUserCounter();
 640 }
 641
 642 long Channel::KickUser(User *src, User *user, const char* reason)
 643 {
 644         bool silent = false;
 645
 646         if (!src || !user || !reason)
 647                 return this->GetUserCounter();
 648
 649         if (IS_LOCAL(src))
 650         {
 651                 if (!this->HasUser(user))
 652                 {
 653                         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());
 654                         return this->GetUserCounter();
 655                 }
 656                 if ((ServerInstance->ULine(user->server)) && (!ServerInstance->ULine(src->server)))
 657                 {
 658                         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());
 659                         return this->GetUserCounter();
 660                 }
 661                 int MOD_RESULT = 0;
 662
 663                 if (!ServerInstance->ULine(src->server))
 664                 {
 665                         MOD_RESULT = 0;
 666                         FOREACH_RESULT(I_OnUserPreKick,OnUserPreKick(src,user,this,reason));
 667                         if (MOD_RESULT == 1)
 668                                 return this->GetUserCounter();
 669                 }
 670                 /* Set to -1 by OnUserPreKick if explicit allow was set */
 671                 if (MOD_RESULT != -1)
 672                 {
 673                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(src,user,this,AC_KICK));
 674                         if ((MOD_RESULT == ACR_DENY) && (!ServerInstance->ULine(src->server)))
 675                                 return this->GetUserCounter();
 676
 677                         if ((MOD_RESULT == ACR_DEFAULT) || (!ServerInstance->ULine(src->server)))
 678                         {
 679                                 int them = this->GetStatus(src);
 680                                 int us = this->GetStatus(user);
 681                                 if ((them < STATUS_HOP) || (them < us))
 682                                 {
 683                                         src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :You must be a channel %soperator",src->nick.c_str(), this->name.c_str(), them == STATUS_HOP ? "" : "half-");
 684                                         return this->GetUserCounter();
 685                                 }
 686                         }
 687                 }
 688         }
 689
 690         FOREACH_MOD(I_OnUserKick,OnUserKick(src, user, this, reason, silent));
 691
 692         UCListIter i = user->chans.find(this);
 693         if (i != user->chans.end())
 694         {
 695                 /* zap it from the channel list of the user */
 696                 if (!silent)
 697                         this->WriteChannel(src, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 698
 699                 user->chans.erase(i);
 700                 this->RemoveAllPrefixes(user);
 701         }
 702
 703         if (!this->DelUser(user))
 704         /* if there are no users left on the channel */
 705         {
 706                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name.c_str());
 707
 708                 /* kill the record */
 709                 if (iter != ServerInstance->chanlist->end())
 710                 {
 711                         int MOD_RESULT = 0;
 712                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 713                         if (MOD_RESULT == 1)
 714                                 return 1; // delete halted by module
 715                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 716                         ServerInstance->chanlist->erase(iter);
 717                 }
 718                 return 0;
 719         }
 720
 721         return this->GetUserCounter();
 722 }
 723
 724 void Channel::WriteChannel(User* user, const char* text, ...)
 725 {
 726         char textbuffer[MAXBUF];
 727         va_list argsPtr;
 728
 729         if (!user || !text)
 730                 return;
 731
 732         va_start(argsPtr, text);
 733         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 734         va_end(argsPtr);
 735
 736         this->WriteChannel(user, std::string(textbuffer));
 737 }
 738
 739 void Channel::WriteChannel(User* user, const std::string &text)
 740 {
 741         CUList *ulist = this->GetUsers();
 742         char tb[MAXBUF];
 743
 744         if (!user)
 745                 return;
 746
 747         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 748         std::string out = tb;
 749
 750         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 751         {
 752                 if (IS_LOCAL(i->first))
 753                         i->first->Write(out);
 754         }
 755 }
 756
 757 void Channel::WriteChannelWithServ(const char* ServName, const char* text, ...)
 758 {
 759         char textbuffer[MAXBUF];
 760         va_list argsPtr;
 761
 762         if (!text)
 763                 return;
 764
 765         va_start(argsPtr, text);
 766         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 767         va_end(argsPtr);
 768
 769         this->WriteChannelWithServ(ServName, std::string(textbuffer));
 770 }
 771
 772 void Channel::WriteChannelWithServ(const char* ServName, const std::string &text)
 773 {
 774         CUList *ulist = this->GetUsers();
 775         char tb[MAXBUF];
 776
 777         snprintf(tb,MAXBUF,":%s %s", ServName ? ServName : ServerInstance->Config->ServerName, text.c_str());
 778         std::string out = tb;
 779
 780         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 781         {
 782                 if (IS_LOCAL(i->first))
 783                         i->first->Write(out);
 784         }
 785 }
 786
 787 /* write formatted text from a source user to all users on a channel except
 788  * for the sender (for privmsg etc) */
 789 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const char* text, ...)
 790 {
 791         char textbuffer[MAXBUF];
 792         va_list argsPtr;
 793
 794         if (!text)
 795                 return;
 796
 797         va_start(argsPtr, text);
 798         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 799         va_end(argsPtr);
 800
 801         this->WriteAllExceptSender(user, serversource, status, std::string(textbuffer));
 802 }
 803
 804 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const char* text, ...)
 805 {
 806         char textbuffer[MAXBUF];
 807         va_list argsPtr;
 808
 809         if (!text)
 810                 return;
 811
 812         va_start(argsPtr, text);
 813         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 814         va_end(argsPtr);
 815
 816         this->WriteAllExcept(user, serversource, status, except_list, std::string(textbuffer));
 817 }
 818
 819 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &text)
 820 {
 821         CUList *ulist = this->GetUsers();
 822         char tb[MAXBUF];
 823
 824         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 825         std::string out = tb;
 826
 827         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 828         {
 829                 if ((IS_LOCAL(i->first)) && (except_list.find(i->first) == except_list.end()))
 830                 {
 831                         /* User doesnt have the status we're after */
 832                         if (status && !strchr(this->GetAllPrefixChars(i->first), status))
 833                                 continue;
 834
 835                         if (serversource)
 836                                 i->first->WriteServ(text);
 837                         else
 838                                 i->first->Write(out);
 839                 }
 840         }
 841 }
 842
 843 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const std::string& text)
 844 {
 845         CUList except_list;
 846         except_list[user] = user->nick;
 847         this->WriteAllExcept(user, serversource, status, except_list, std::string(text));
 848 }
 849
 850 /*
 851  * return a count of the users on a specific channel accounting for
 852  * invisible users who won't increase the count. e.g. for /LIST
 853  */
 854 int Channel::CountInvisible()
 855 {
 856         int count = 0;
 857         CUList *ulist= this->GetUsers();
 858         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 859         {
 860                 if (!(i->first->IsModeSet('i')))
 861                         count++;
 862         }
 863
 864         return count;
 865 }
 866
 867 char* Channel::ChanModes(bool showkey)
 868 {
 869         static char scratch[MAXBUF];
 870         static char sparam[MAXBUF];
 871         char* offset = scratch;
 872         std::string extparam;
 873
 874         *scratch = '\0';
 875         *sparam = '\0';
 876
 877         /* This was still iterating up to 190, Channel::modes is only 64 elements -- Om */
 878         for(int n = 0; n < 64; n++)
 879         {
 880                 if(this->modes[n])
 881                 {
 882                         *offset++ = n + 65;
 883                         extparam.clear();
 884                         switch (n)
 885                         {
 886                                 case CM_KEY:
 887                                         // Unfortunately this must be special-cased, as we definitely don't want to always display key.
 888                                         if (showkey)
 889                                         {
 890                                                 extparam = this->GetModeParameter('k');
 891                                         }
 892                                         else
 893                                         {
 894                                                 extparam = "<key>";
 895                                         }
 896                                         break;
 897                                 case CM_NOEXTERNAL:
 898                                 case CM_TOPICLOCK:
 899                                 case CM_INVITEONLY:
 900                                 case CM_MODERATED:
 901                                 case CM_SECRET:
 902                                 case CM_PRIVATE:
 903                                         /* We know these have no parameters */
 904                                 break;
 905                                 default:
 906                                         extparam = this->GetModeParameter(n + 65);
 907                                 break;
 908                         }
 909                         if (!extparam.empty())
 910                         {
 911                                 charlcat(sparam,' ',MAXBUF);
 912                                 strlcat(sparam,extparam.c_str(),MAXBUF);
 913                         }
 914                 }
 915         }
 916
 917         /* Null terminate scratch */
 918         *offset = '\0';
 919         strlcat(scratch,sparam,MAXBUF);
 920         return scratch;
 921 }
 922
 923 /* compile a userlist of a channel into a string, each nick seperated by
 924  * spaces and op, voice etc status shown as @ and +, and send it to 'user'
 925  */
 926 void Channel::UserList(User *user, CUList *ulist)
 927 {
 928         char list[MAXBUF];
 929         size_t dlen, curlen;
 930         int MOD_RESULT = 0;
 931         bool call_modules = true;
 932
 933         if (!IS_LOCAL(user))
 934                 return;
 935
 936         FOREACH_RESULT(I_OnUserList,OnUserList(user, this, ulist));
 937         if (MOD_RESULT == 1)
 938                 call_modules = false;
 939
 940         if (MOD_RESULT != -1)
 941         {
 942                 if ((this->IsModeSet('s')) && (!this->HasUser(user)))
 943                 {
 944                         user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel",user->nick.c_str(), this->name.c_str());
 945                         return;
 946                 }
 947         }
 948
 949         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=',  this->name.c_str());
 950
 951         int numusers = 0;
 952         char* ptr = list + dlen;
 953
 954         if (!ulist)
 955                 ulist = this->GetUsers();
 956
 957         /* Improvement by Brain - this doesnt change in value, so why was it inside
 958          * the loop?
 959          */
 960         bool has_user = this->HasUser(user);
 961
 962         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 963         {
 964                 if ((!has_user) && (i->first->IsModeSet('i')))
 965                 {
 966                         /*
 967                          * user is +i, and source not on the channel, does not show
 968                          * nick in NAMES list
 969                          */
 970                         continue;
 971                 }
 972
 973                 if (i->first->Visibility && !i->first->Visibility->VisibleTo(user))
 974                         continue;
 975
 976                 std::string prefixlist = this->GetPrefixChar(i->first);
 977                 std::string nick = i->first->nick;
 978
 979                 if (call_modules)
 980                 {
 981                         FOREACH_MOD(I_OnNamesListItem, OnNamesListItem(user, i->first, this, prefixlist, nick));
 982
 983                         /* Nick was nuked, a module wants us to skip it */
 984                         if (nick.empty())
 985                                 continue;
 986                 }
 987
 988                 size_t ptrlen = 0;
 989
 990                 if (curlen + prefixlist.length() + nick.length() + 1 > 480)
 991                 {
 992                         /* list overflowed into multiple numerics */
 993                         user->WriteServ(std::string(list));
 994
 995                         /* reset our lengths */
 996                         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=', this->name.c_str());
 997                         ptr = list + dlen;
 998
 999                         ptrlen = 0;
1000                         numusers = 0;
1001                 }
1002
1003                 ptrlen = snprintf(ptr, MAXBUF, "%s%s ", prefixlist.c_str(), nick.c_str());
1004
1005                 curlen += ptrlen;
1006                 ptr += ptrlen;
1007
1008                 numusers++;
1009         }
1010
1011         /* if whats left in the list isnt empty, send it */
1012         if (numusers)
1013         {
1014                 user->WriteNumeric(RPL_NAMREPLY, std::string(list));
1015         }
1016
1017         user->WriteNumeric(RPL_ENDOFNAMES, "%s %s :End of /NAMES list.", user->nick.c_str(), this->name.c_str());
1018 }
1019
1020 long Channel::GetMaxBans()
1021 {
1022         /* Return the cached value if there is one */
1023         if (this->maxbans)
1024                 return this->maxbans;
1025
1026         /* If there isnt one, we have to do some O(n) hax to find it the first time. (ick) */
1027         for (std::map<std::string,int>::iterator n = ServerInstance->Config->maxbans.begin(); n != ServerInstance->Config->maxbans.end(); n++)
1028         {
1029                 if (match(this->name,n->first))
1030                 {
1031                         this->maxbans = n->second;
1032                         return n->second;
1033                 }
1034         }
1035
1036         /* Screw it, just return the default of 64 */
1037         this->maxbans = 64;
1038         return this->maxbans;
1039 }
1040
1041 void Channel::ResetMaxBans()
1042 {
1043         this->maxbans = 0;
1044 }
1045
1046 /* returns the status character for a given user on a channel, e.g. @ for op,
1047  * % for halfop etc. If the user has several modes set, the highest mode
1048  * the user has must be returned.
1049  */
1050 const char* Channel::GetPrefixChar(User *user)
1051 {
1052         static char pf[2] = {0, 0};
1053
1054         prefixlist::iterator n = prefixes.find(user);
1055         if (n != prefixes.end())
1056         {
1057                 if (n->second.size())
1058                 {
1059                         /* If the user has any prefixes, their highest prefix
1060                          * will always be at the head of the list, as the list is
1061                          * sorted in rank order highest first (see SetPrefix()
1062                          * for reasons why)
1063                          */
1064                         *pf = n->second.begin()->first;
1065                         return pf;
1066                 }
1067         }
1068
1069         *pf = 0;
1070         return pf;
1071 }
1072
1073
1074 const char* Channel::GetAllPrefixChars(User* user)
1075 {
1076         static char prefix[MAXBUF];
1077         int ctr = 0;
1078         *prefix = 0;
1079
1080         prefixlist::iterator n = prefixes.find(user);
1081         if (n != prefixes.end())
1082         {
1083                 for (std::vector<prefixtype>::iterator x = n->second.begin(); x != n->second.end(); x++)
1084                 {
1085                         prefix[ctr++] = x->first;
1086                 }
1087         }
1088
1089         prefix[ctr] = 0;
1090
1091         return prefix;
1092 }
1093
1094 unsigned int Channel::GetPrefixValue(User* user)
1095 {
1096         prefixlist::iterator n = prefixes.find(user);
1097         if (n != prefixes.end())
1098         {
1099                 if (n->second.size())
1100                         return n->second.begin()->second;
1101         }
1102         return 0;
1103 }
1104
1105 int Channel::GetStatusFlags(User *user)
1106 {
1107         UCListIter i = user->chans.find(this);
1108         if (i != user->chans.end())
1109         {
1110                 return i->second;
1111         }
1112         return 0;
1113 }
1114
1115 int Channel::GetStatus(User *user)
1116 {
1117         if (ServerInstance->ULine(user->server))
1118                 return STATUS_OP;
1119
1120         UCListIter i = user->chans.find(this);
1121         if (i != user->chans.end())
1122         {
1123                 if ((i->second & UCMODE_OP) > 0)
1124                 {
1125                         return STATUS_OP;
1126                 }
1127                 if ((i->second & UCMODE_HOP) > 0)
1128                 {
1129                         return STATUS_HOP;
1130                 }
1131                 if ((i->second & UCMODE_VOICE) > 0)
1132                 {
1133                         return STATUS_VOICE;
1134                 }
1135                 return STATUS_NORMAL;
1136         }
1137         return STATUS_NORMAL;
1138 }
1139
1140 void Channel::SetPrefix(User* user, char prefix, unsigned int prefix_value, bool adding)
1141 {
1142         prefixlist::iterator n = prefixes.find(user);
1143         prefixtype pfx = std::make_pair(prefix,prefix_value);
1144         if (adding)
1145         {
1146                 if (n != prefixes.end())
1147                 {
1148                         if (std::find(n->second.begin(), n->second.end(), pfx) == n->second.end())
1149                         {
1150                                 n->second.push_back(pfx);
1151                                 /* We must keep prefixes in rank order, largest first.
1152                                  * This is for two reasons, firstly because x-chat *ass-u-me's* this
1153                                  * state, and secondly it turns out to be a benefit to us later.
1154                                  * See above in GetPrefix().
1155                                  */
1156                                 std::sort(n->second.begin(), n->second.end(), ModeParser::PrefixComparison);
1157                         }
1158                 }
1159                 else
1160                 {
1161                         pfxcontainer one;
1162                         one.push_back(pfx);
1163                         prefixes.insert(std::make_pair<User*,pfxcontainer>(user, one));
1164                 }
1165         }
1166         else
1167         {
1168                 if (n != prefixes.end())
1169                 {
1170                         pfxcontainer::iterator x = std::find(n->second.begin(), n->second.end(), pfx);
1171                         if (x != n->second.end())
1172                                 n->second.erase(x);
1173                 }
1174         }
1175 }
1176
1177 void Channel::RemoveAllPrefixes(User* user)
1178 {
1179         prefixlist::iterator n = prefixes.find(user);
1180         if (n != prefixes.end())
1181         {
1182                 prefixes.erase(n);
1183         }
1184 }
1185