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
 105         this->topic.assign(ntopic, 0, ServerInstance->Config->Limits.MaxTopic);
 106         this->setby.assign(ServerInstance->Config->FullHostInTopic ? u->GetFullHost() : u->nick, 0, 128);
 107         this->topicset = ServerInstance->Time();
 108         this->WriteChannel(u, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
 109
 110         if (IS_LOCAL(u))
 111         {
 112                 FOREACH_MOD(I_OnPostLocalTopicChange,OnPostLocalTopicChange(u, this, this->topic));
 113         }
 114
 115         return CMD_SUCCESS;
 116 }
 117
 118 long Channel::GetUserCounter()
 119 {
 120         return (this->internal_userlist.size());
 121 }
 122
 123 void Channel::AddUser(User* user)
 124 {
 125         internal_userlist[user] = user->nick;
 126 }
 127
 128 unsigned long Channel::DelUser(User* user)
 129 {
 130         CUListIter a = internal_userlist.find(user);
 131
 132         if (a != internal_userlist.end())
 133         {
 134                 internal_userlist.erase(a);
 135                 /* And tidy any others... */
 136                 DelOppedUser(user);
 137                 DelHalfoppedUser(user);
 138                 DelVoicedUser(user);
 139         }
 140
 141         return internal_userlist.size();
 142 }
 143
 144 bool Channel::HasUser(User* user)
 145 {
 146         return (internal_userlist.find(user) != internal_userlist.end());
 147 }
 148
 149 void Channel::AddOppedUser(User* user)
 150 {
 151         internal_op_userlist[user] = user->nick;
 152 }
 153
 154 void Channel::DelOppedUser(User* user)
 155 {
 156         CUListIter a = internal_op_userlist.find(user);
 157         if (a != internal_op_userlist.end())
 158         {
 159                 internal_op_userlist.erase(a);
 160                 return;
 161         }
 162 }
 163
 164 void Channel::AddHalfoppedUser(User* user)
 165 {
 166         internal_halfop_userlist[user] = user->nick;
 167 }
 168
 169 void Channel::DelHalfoppedUser(User* user)
 170 {
 171         CUListIter a = internal_halfop_userlist.find(user);
 172
 173         if (a != internal_halfop_userlist.end())
 174         {
 175                 internal_halfop_userlist.erase(a);
 176         }
 177 }
 178
 179 void Channel::AddVoicedUser(User* user)
 180 {
 181         internal_voice_userlist[user] = user->nick;
 182 }
 183
 184 void Channel::DelVoicedUser(User* user)
 185 {
 186         CUListIter a = internal_voice_userlist.find(user);
 187
 188         if (a != internal_voice_userlist.end())
 189         {
 190                 internal_voice_userlist.erase(a);
 191         }
 192 }
 193
 194 CUList* Channel::GetUsers()
 195 {
 196         return &internal_userlist;
 197 }
 198
 199 CUList* Channel::GetOppedUsers()
 200 {
 201         return &internal_op_userlist;
 202 }
 203
 204 CUList* Channel::GetHalfoppedUsers()
 205 {
 206         return &internal_halfop_userlist;
 207 }
 208
 209 CUList* Channel::GetVoicedUsers()
 210 {
 211         return &internal_voice_userlist;
 212 }
 213
 214 void Channel::SetDefaultModes()
 215 {
 216         ServerInstance->Logs->Log("CHANNELS", DEBUG, "SetDefaultModes %s", ServerInstance->Config->DefaultModes);
 217         irc::spacesepstream list(ServerInstance->Config->DefaultModes);
 218         std::string modeseq;
 219         std::string parameter;
 220
 221         list.GetToken(modeseq);
 222
 223         for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 224         {
 225                 ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 226                 if (mode)
 227                 {
 228                         if (mode->GetNumParams(true))
 229                                 list.GetToken(parameter);
 230                         else
 231                                 parameter.clear();
 232
 233                         mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, this, parameter, true);
 234                 }
 235         }
 236 }
 237
 238 /*
 239  * add a channel to a user, creating the record for it if needed and linking
 240  * it to the user record
 241  */
 242 Channel* Channel::JoinUser(InspIRCd* Instance, User *user, const char* cn, bool override, const char* key, bool bursting, time_t TS)
 243 {
 244         if (!user || !cn)
 245                 return NULL;
 246
 247         char cname[MAXBUF];
 248         int MOD_RESULT = 0;
 249         std::string privs;
 250         Channel *Ptr;
 251
 252         /*
 253          * We don't restrict the number of channels that remote users or users that are override-joining may be in.
 254          * We restrict local users to MaxChans channels.
 255          * We restrict local operators to OperMaxChans channels.
 256          * This is a lot more logical than how it was formerly. -- w00t
 257          */
 258         if (IS_LOCAL(user) && !override)
 259         {
 260                 // Checking MyClass exists because we *may* get here with NULL, not 100% sure.
 261                 if (user->MyClass && user->MyClass->GetMaxChans())
 262                 {
 263                         if (user->chans.size() >= user->MyClass->GetMaxChans())
 264                         {
 265                                 user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 266                                 return NULL;
 267                         }
 268                 }
 269                 else
 270                 {
 271                         if (IS_OPER(user))
 272                         {
 273                                 if (user->chans.size() >= Instance->Config->OperMaxChans)
 274                                 {
 275                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 276                                         return NULL;
 277                                 }
 278                         }
 279                         else
 280                         {
 281                                 if (user->chans.size() >= Instance->Config->MaxChans)
 282                                 {
 283                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 284                                         return NULL;
 285                                 }
 286                         }
 287                 }
 288         }
 289
 290         strlcpy(cname, cn, Instance->Config->Limits.ChanMax);
 291         Ptr = Instance->FindChan(cname);
 292
 293         if (!Ptr)
 294         {
 295                 /*
 296                  * Fix: desync bug was here, don't set @ on remote users - spanningtree handles their permissions. bug #358. -- w00t
 297                  */
 298                 if (!IS_LOCAL(user))
 299                 {
 300                         if (!TS)
 301                                 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);
 302                 }
 303                 else
 304                 {
 305                         privs = "@";
 306                 }
 307
 308                 if (IS_LOCAL(user) && override == false)
 309                 {
 310                         MOD_RESULT = 0;
 311                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, NULL, cname, privs, key ? key : ""));
 312                         if (MOD_RESULT == 1)
 313                                 return NULL;
 314                 }
 315
 316                 Ptr = new Channel(Instance, cname, TS);
 317         }
 318         else
 319         {
 320                 /* Already on the channel */
 321                 if (Ptr->HasUser(user))
 322                         return NULL;
 323
 324                 /*
 325                  * remote users are allowed us to bypass channel modes
 326                  * and bans (used by servers)
 327                  */
 328                 if (IS_LOCAL(user) && override == false)
 329                 {
 330                         MOD_RESULT = 0;
 331                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, Ptr, cname, privs, key ? key : ""));
 332                         if (MOD_RESULT == 1)
 333                         {
 334                                 return NULL;
 335                         }
 336                         else if (MOD_RESULT == 0)
 337                         {
 338                                 std::string ckey = Ptr->GetModeParameter('k');
 339                                 bool invited = user->IsInvited(Ptr->name.c_str());
 340                                 bool can_bypass = Instance->Config->InvBypassModes && invited;
 341
 342                                 if (!ckey.empty())
 343                                 {
 344                                         MOD_RESULT = 0;
 345                                         FOREACH_RESULT_I(Instance, I_OnCheckKey, OnCheckKey(user, Ptr, key ? key : ""));
 346                                         if (!MOD_RESULT)
 347                                         {
 348                                                 // If no key provided, or key is not the right one, and can't bypass +k (not invited or option not enabled)
 349                                                 if ((!key || ckey != key) && !can_bypass)
 350                                                 {
 351                                                         user->WriteNumeric(ERR_BADCHANNELKEY, "%s %s :Cannot join channel (Incorrect channel key)",user->nick.c_str(), Ptr->name.c_str());
 352                                                         return NULL;
 353                                                 }
 354                                         }
 355                                 }
 356
 357                                 if (Ptr->IsModeSet('i'))
 358                                 {
 359                                         MOD_RESULT = 0;
 360                                         FOREACH_RESULT_I(Instance,I_OnCheckInvite,OnCheckInvite(user, Ptr));
 361                                         if (!MOD_RESULT)
 362                                         {
 363                                                 if (!invited)
 364                                                 {
 365                                                         user->WriteNumeric(ERR_INVITEONLYCHAN, "%s %s :Cannot join channel (Invite only)",user->nick.c_str(), Ptr->name.c_str());
 366                                                         return NULL;
 367                                                 }
 368                                         }
 369                                 }
 370
 371                                 std::string limit = Ptr->GetModeParameter('l');
 372                                 if (!limit.empty())
 373                                 {
 374                                         MOD_RESULT = 0;
 375                                         FOREACH_RESULT_I(Instance, I_OnCheckLimit, OnCheckLimit(user, Ptr));
 376                                         if (!MOD_RESULT)
 377                                         {
 378                                                 long llimit = atol(limit.c_str());
 379                                                 if (Ptr->GetUserCounter() >= llimit && !can_bypass)
 380                                                 {
 381                                                         user->WriteNumeric(ERR_CHANNELISFULL, "%s %s :Cannot join channel (Channel is full)",user->nick.c_str(), Ptr->name.c_str());
 382                                                         return NULL;
 383                                                 }
 384                                         }
 385                                 }
 386
 387                                 if (Ptr->bans.size())
 388                                 {
 389                                         if (Ptr->IsBanned(user) && !can_bypass)
 390                                         {
 391                                                 user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s %s :Cannot join channel (You're banned)",user->nick.c_str(), Ptr->name.c_str());
 392                                                 return NULL;
 393                                         }
 394                                 }
 395
 396                                 /*
 397                                  * If the user has invites for this channel, remove them now
 398                                  * after a successful join so they don't build up.
 399                                  */
 400                                 if (invited)
 401                                 {
 402                                         user->RemoveInvite(Ptr->name.c_str());
 403                                 }
 404                         }
 405                 }
 406         }
 407
 408         /* As spotted by jilles, dont bother to set this on remote users */
 409         if (IS_LOCAL(user) && Ptr->GetUserCounter() == 0)
 410                 Ptr->SetDefaultModes();
 411
 412         return Channel::ForceChan(Instance, Ptr, user, privs, bursting);
 413 }
 414
 415 Channel* Channel::ForceChan(InspIRCd* Instance, Channel* Ptr, User* user, const std::string &privs, bool bursting)
 416 {
 417         std::string nick = user->nick;
 418         bool silent = false;
 419
 420         Ptr->AddUser(user);
 421
 422         /* Just in case they have no permissions */
 423         user->chans[Ptr] = 0;
 424
 425         for (std::string::const_iterator x = privs.begin(); x != privs.end(); x++)
 426         {
 427                 const char status = *x;
 428                 ModeHandler* mh = Instance->Modes->FindPrefix(status);
 429                 if (mh)
 430                 {
 431                         /* Set, and make sure that the mode handler knows this mode was now set */
 432                         Ptr->SetPrefix(user, status, mh->GetPrefixRank(), true);
 433                         mh->OnModeChange(Instance->FakeClient, Instance->FakeClient, Ptr, nick, true);
 434
 435                         switch (mh->GetPrefix())
 436                         {
 437                                 /* These logic ops are SAFE IN THIS CASE because if the entry doesnt exist,
 438                                  * addressing operator[] creates it. If they do exist, it points to it.
 439                                  * At all other times where we dont want to create an item if it doesnt exist, we
 440                                  * must stick to ::find().
 441                                  */
 442                                 case '@':
 443                                         user->chans[Ptr] |= UCMODE_OP;
 444                                 break;
 445                                 case '%':
 446                                         user->chans[Ptr] |= UCMODE_HOP;
 447                                 break;
 448                                 case '+':
 449                                         user->chans[Ptr] |= UCMODE_VOICE;
 450                                 break;
 451                         }
 452                 }
 453         }
 454
 455         FOREACH_MOD_I(Instance,I_OnUserJoin,OnUserJoin(user, Ptr, bursting, silent));
 456
 457         if (!silent)
 458                 Ptr->WriteChannel(user,"JOIN :%s",Ptr->name.c_str());
 459
 460         /* Theyre not the first ones in here, make sure everyone else sees the modes we gave the user */
 461         std::string ms = Instance->Modes->ModeString(user, Ptr);
 462         if ((Ptr->GetUserCounter() > 1) && (ms.length()))
 463                 Ptr->WriteAllExceptSender(user, true, 0, "MODE %s +%s", Ptr->name.c_str(), ms.c_str());
 464
 465         /* Major improvement by Brain - we dont need to be calculating all this pointlessly for remote users */
 466         if (IS_LOCAL(user))
 467         {
 468                 if (Ptr->topicset)
 469                 {
 470                         user->WriteNumeric(RPL_TOPIC, "%s %s :%s", user->nick.c_str(), Ptr->name.c_str(), Ptr->topic.c_str());
 471                         user->WriteNumeric(RPL_TOPICTIME, "%s %s %s %lu", user->nick.c_str(), Ptr->name.c_str(), Ptr->setby.c_str(), (unsigned long)Ptr->topicset);
 472                 }
 473                 Ptr->UserList(user);
 474         }
 475         FOREACH_MOD_I(Instance,I_OnPostJoin,OnPostJoin(user, Ptr));
 476         return Ptr;
 477 }
 478
 479 bool Channel::IsBanned(User* user)
 480 {
 481         char mask[MAXBUF];
 482         int MOD_RESULT = 0;
 483         FOREACH_RESULT(I_OnCheckBan,OnCheckBan(user, this));
 484
 485         if (MOD_RESULT == -1)
 486                 return true;
 487         else if (MOD_RESULT == 0)
 488         {
 489                 snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 490                 for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 491                 {
 492                         /* This allows CIDR ban matching
 493                          *
 494                          *        Full masked host                      Full unmasked host                   IP with/without CIDR
 495                          */
 496                         if ((match(user->GetFullHost(),i->data)) || (match(user->GetFullRealHost(),i->data)) || (match(mask, i->data, true)))
 497                         {
 498                                 return true;
 499                         }
 500                 }
 501         }
 502         return false;
 503 }
 504
 505 bool Channel::IsExtBanned(const std::string &str, char type)
 506 {
 507         int MOD_RESULT = 0;
 508         FOREACH_RESULT(I_OnCheckStringExtBan, OnCheckStringExtBan(str, this, type));
 509
 510         if (MOD_RESULT == -1)
 511                 return true;
 512         else if (MOD_RESULT == 0)
 513         {
 514                 for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 515                 {
 516                         if (i->data[0] != type || i->data[1] != ':')
 517                                 continue;
 518
 519                         // Iterate past char and : to get to the mask without doing a data copy(!)
 520                         std::string maskptr = i->data.substr(2);
 521                         ServerInstance->Logs->Log("EXTBANS", DEBUG, "Checking %s against %s, type is %c", str.c_str(), maskptr.c_str(), type);
 522
 523                         if (match(str, maskptr))
 524                                 return true;
 525                 }
 526         }
 527
 528         return false;
 529 }
 530
 531 bool Channel::IsExtBanned(User *user, char type)
 532 {
 533         int MOD_RESULT = 0;
 534         FOREACH_RESULT(I_OnCheckExtBan, OnCheckExtBan(user, this, type));
 535
 536         if (MOD_RESULT == -1)
 537                 return true;
 538         else if (MOD_RESULT == 0)
 539         {
 540                 char mask[MAXBUF];
 541                 snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 542
 543                 // XXX: we should probably hook cloaked hosts in here somehow too..
 544                 if (this->IsExtBanned(mask, type))
 545                         return true;
 546
 547                 if (this->IsExtBanned(user->GetFullHost(), type))
 548                         return true;
 549
 550                 if (this->IsExtBanned(user->GetFullRealHost(), type))
 551                         return true;
 552         }
 553
 554         return false;
 555 }
 556
 557 /* Channel::PartUser
 558  * remove a channel from a users record, and return the number of users left.
 559  * Therefore, if this function returns 0 the caller should delete the Channel.
 560  *
 561  * XXX: bleh, string copy of reason, fixme! -- w00t
 562  */
 563 long Channel::PartUser(User *user, std::string &reason)
 564 {
 565         bool silent = false;
 566
 567         if (!user)
 568                 return this->GetUserCounter();
 569
 570         UCListIter i = user->chans.find(this);
 571         if (i != user->chans.end())
 572         {
 573                 FOREACH_MOD(I_OnUserPart,OnUserPart(user, this, reason, silent));
 574
 575                 if (!silent)
 576                         this->WriteChannel(user, "PART %s%s%s", this->name.c_str(), reason.empty() ? "" : " :", reason.c_str());
 577
 578                 user->chans.erase(i);
 579                 this->RemoveAllPrefixes(user);
 580         }
 581
 582         if (!this->DelUser(user)) /* if there are no users left on the channel... */
 583         {
 584                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 585                 /* kill the record */
 586                 if (iter != ServerInstance->chanlist->end())
 587                 {
 588                         int MOD_RESULT = 0;
 589                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 590                         if (MOD_RESULT == 1)
 591                                 return 1; // delete halted by module
 592                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 593                         ServerInstance->chanlist->erase(iter);
 594                 }
 595                 return 0;
 596         }
 597
 598         return this->GetUserCounter();
 599 }
 600
 601 long Channel::ServerKickUser(User* user, const char* reason, bool triggerevents, const char* servername)
 602 {
 603         bool silent = false;
 604
 605         if (!user || !reason)
 606                 return this->GetUserCounter();
 607
 608         if (IS_LOCAL(user))
 609         {
 610                 if (!this->HasUser(user))
 611                 {
 612                         /* Not on channel */
 613                         return this->GetUserCounter();
 614                 }
 615         }
 616
 617         if (servername == NULL || *ServerInstance->Config->HideWhoisServer)
 618                 servername = ServerInstance->Config->ServerName;
 619
 620         if (triggerevents)
 621         {
 622                 FOREACH_MOD(I_OnUserKick,OnUserKick(NULL, user, this, reason, silent));
 623         }
 624
 625         UCListIter i = user->chans.find(this);
 626         if (i != user->chans.end())
 627         {
 628                 if (!silent)
 629                         this->WriteChannelWithServ(servername, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 630
 631                 user->chans.erase(i);
 632                 this->RemoveAllPrefixes(user);
 633         }
 634
 635         if (!this->DelUser(user))
 636         {
 637                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 638                 /* kill the record */
 639                 if (iter != ServerInstance->chanlist->end())
 640                 {
 641                         int MOD_RESULT = 0;
 642                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 643                         if (MOD_RESULT == 1)
 644                                 return 1; // delete halted by module
 645                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 646                         ServerInstance->chanlist->erase(iter);
 647                 }
 648                 return 0;
 649         }
 650
 651         return this->GetUserCounter();
 652 }
 653
 654 long Channel::KickUser(User *src, User *user, const char* reason)
 655 {
 656         bool silent = false;
 657
 658         if (!src || !user || !reason)
 659                 return this->GetUserCounter();
 660
 661         if (IS_LOCAL(src))
 662         {
 663                 if (!this->HasUser(user))
 664                 {
 665                         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());
 666                         return this->GetUserCounter();
 667                 }
 668                 if ((ServerInstance->ULine(user->server)) && (!ServerInstance->ULine(src->server)))
 669                 {
 670                         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());
 671                         return this->GetUserCounter();
 672                 }
 673                 int MOD_RESULT = 0;
 674
 675                 if (!ServerInstance->ULine(src->server))
 676                 {
 677                         MOD_RESULT = 0;
 678                         FOREACH_RESULT(I_OnUserPreKick,OnUserPreKick(src,user,this,reason));
 679                         if (MOD_RESULT == 1)
 680                                 return this->GetUserCounter();
 681                 }
 682                 /* Set to -1 by OnUserPreKick if explicit allow was set */
 683                 if (MOD_RESULT != -1)
 684                 {
 685                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(src,user,this,AC_KICK));
 686                         if ((MOD_RESULT == ACR_DENY) && (!ServerInstance->ULine(src->server)))
 687                                 return this->GetUserCounter();
 688
 689                         if ((MOD_RESULT == ACR_DEFAULT) || (!ServerInstance->ULine(src->server)))
 690                         {
 691                                 int them = this->GetStatus(src);
 692                                 int us = this->GetStatus(user);
 693                                 if ((them < STATUS_HOP) || (them < us))
 694                                 {
 695                                         src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :You must be a channel %soperator",src->nick.c_str(), this->name.c_str(), them == STATUS_HOP ? "" : "half-");
 696                                         return this->GetUserCounter();
 697                                 }
 698                         }
 699                 }
 700         }
 701
 702         FOREACH_MOD(I_OnUserKick,OnUserKick(src, user, this, reason, silent));
 703
 704         UCListIter i = user->chans.find(this);
 705         if (i != user->chans.end())
 706         {
 707                 /* zap it from the channel list of the user */
 708                 if (!silent)
 709                         this->WriteChannel(src, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 710
 711                 user->chans.erase(i);
 712                 this->RemoveAllPrefixes(user);
 713         }
 714
 715         if (!this->DelUser(user))
 716         /* if there are no users left on the channel */
 717         {
 718                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name.c_str());
 719
 720                 /* kill the record */
 721                 if (iter != ServerInstance->chanlist->end())
 722                 {
 723                         int MOD_RESULT = 0;
 724                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 725                         if (MOD_RESULT == 1)
 726                                 return 1; // delete halted by module
 727                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 728                         ServerInstance->chanlist->erase(iter);
 729                 }
 730                 return 0;
 731         }
 732
 733         return this->GetUserCounter();
 734 }
 735
 736 void Channel::WriteChannel(User* user, const char* text, ...)
 737 {
 738         char textbuffer[MAXBUF];
 739         va_list argsPtr;
 740
 741         if (!user || !text)
 742                 return;
 743
 744         va_start(argsPtr, text);
 745         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 746         va_end(argsPtr);
 747
 748         this->WriteChannel(user, std::string(textbuffer));
 749 }
 750
 751 void Channel::WriteChannel(User* user, const std::string &text)
 752 {
 753         CUList *ulist = this->GetUsers();
 754         char tb[MAXBUF];
 755
 756         if (!user)
 757                 return;
 758
 759         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 760         std::string out = tb;
 761
 762         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 763         {
 764                 if (IS_LOCAL(i->first))
 765                         i->first->Write(out);
 766         }
 767 }
 768
 769 void Channel::WriteChannelWithServ(const char* ServName, const char* text, ...)
 770 {
 771         char textbuffer[MAXBUF];
 772         va_list argsPtr;
 773
 774         if (!text)
 775                 return;
 776
 777         va_start(argsPtr, text);
 778         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 779         va_end(argsPtr);
 780
 781         this->WriteChannelWithServ(ServName, std::string(textbuffer));
 782 }
 783
 784 void Channel::WriteChannelWithServ(const char* ServName, const std::string &text)
 785 {
 786         CUList *ulist = this->GetUsers();
 787         char tb[MAXBUF];
 788
 789         snprintf(tb,MAXBUF,":%s %s", ServName ? ServName : ServerInstance->Config->ServerName, text.c_str());
 790         std::string out = tb;
 791
 792         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 793         {
 794                 if (IS_LOCAL(i->first))
 795                         i->first->Write(out);
 796         }
 797 }
 798
 799 /* write formatted text from a source user to all users on a channel except
 800  * for the sender (for privmsg etc) */
 801 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const char* text, ...)
 802 {
 803         char textbuffer[MAXBUF];
 804         va_list argsPtr;
 805
 806         if (!text)
 807                 return;
 808
 809         va_start(argsPtr, text);
 810         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 811         va_end(argsPtr);
 812
 813         this->WriteAllExceptSender(user, serversource, status, std::string(textbuffer));
 814 }
 815
 816 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const char* text, ...)
 817 {
 818         char textbuffer[MAXBUF];
 819         va_list argsPtr;
 820
 821         if (!text)
 822                 return;
 823
 824         va_start(argsPtr, text);
 825         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 826         va_end(argsPtr);
 827
 828         this->WriteAllExcept(user, serversource, status, except_list, std::string(textbuffer));
 829 }
 830
 831 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &text)
 832 {
 833         CUList *ulist = this->GetUsers();
 834         char tb[MAXBUF];
 835
 836         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 837         std::string out = tb;
 838
 839         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 840         {
 841                 if ((IS_LOCAL(i->first)) && (except_list.find(i->first) == except_list.end()))
 842                 {
 843                         /* User doesnt have the status we're after */
 844                         if (status && !strchr(this->GetAllPrefixChars(i->first), status))
 845                                 continue;
 846
 847                         if (serversource)
 848                                 i->first->WriteServ(text);
 849                         else
 850                                 i->first->Write(out);
 851                 }
 852         }
 853 }
 854
 855 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const std::string& text)
 856 {
 857         CUList except_list;
 858         except_list[user] = user->nick;
 859         this->WriteAllExcept(user, serversource, status, except_list, std::string(text));
 860 }
 861
 862 /*
 863  * return a count of the users on a specific channel accounting for
 864  * invisible users who won't increase the count. e.g. for /LIST
 865  */
 866 int Channel::CountInvisible()
 867 {
 868         int count = 0;
 869         CUList *ulist= this->GetUsers();
 870         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 871         {
 872                 if (!(i->first->IsModeSet('i')))
 873                         count++;
 874         }
 875
 876         return count;
 877 }
 878
 879 char* Channel::ChanModes(bool showkey)
 880 {
 881         static char scratch[MAXBUF];
 882         static char sparam[MAXBUF];
 883         char* offset = scratch;
 884         std::string extparam;
 885
 886         *scratch = '\0';
 887         *sparam = '\0';
 888
 889         /* This was still iterating up to 190, Channel::modes is only 64 elements -- Om */
 890         for(int n = 0; n < 64; n++)
 891         {
 892                 if(this->modes[n])
 893                 {
 894                         *offset++ = n + 65;
 895                         extparam.clear();
 896                         switch (n)
 897                         {
 898                                 case CM_KEY:
 899                                         // Unfortunately this must be special-cased, as we definitely don't want to always display key.
 900                                         if (showkey)
 901                                         {
 902                                                 extparam = this->GetModeParameter('k');
 903                                         }
 904                                         else
 905                                         {
 906                                                 extparam = "<key>";
 907                                         }
 908                                         break;
 909                                 case CM_NOEXTERNAL:
 910                                 case CM_TOPICLOCK:
 911                                 case CM_INVITEONLY:
 912                                 case CM_MODERATED:
 913                                 case CM_SECRET:
 914                                 case CM_PRIVATE:
 915                                         /* We know these have no parameters */
 916                                 break;
 917                                 default:
 918                                         extparam = this->GetModeParameter(n + 65);
 919                                 break;
 920                         }
 921                         if (!extparam.empty())
 922                         {
 923                                 charlcat(sparam,' ',MAXBUF);
 924                                 strlcat(sparam,extparam.c_str(),MAXBUF);
 925                         }
 926                 }
 927         }
 928
 929         /* Null terminate scratch */
 930         *offset = '\0';
 931         strlcat(scratch,sparam,MAXBUF);
 932         return scratch;
 933 }
 934
 935 /* compile a userlist of a channel into a string, each nick seperated by
 936  * spaces and op, voice etc status shown as @ and +, and send it to 'user'
 937  */
 938 void Channel::UserList(User *user, CUList *ulist)
 939 {
 940         char list[MAXBUF];
 941         size_t dlen, curlen;
 942         int MOD_RESULT = 0;
 943         bool call_modules = true;
 944
 945         if (!IS_LOCAL(user))
 946                 return;
 947
 948         FOREACH_RESULT(I_OnUserList,OnUserList(user, this, ulist));
 949         if (MOD_RESULT == 1)
 950                 call_modules = false;
 951
 952         if (MOD_RESULT != -1)
 953         {
 954                 if ((this->IsModeSet('s')) && (!this->HasUser(user)))
 955                 {
 956                         user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel",user->nick.c_str(), this->name.c_str());
 957                         return;
 958                 }
 959         }
 960
 961         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=',  this->name.c_str());
 962
 963         int numusers = 0;
 964         char* ptr = list + dlen;
 965
 966         if (!ulist)
 967                 ulist = this->GetUsers();
 968
 969         /* Improvement by Brain - this doesnt change in value, so why was it inside
 970          * the loop?
 971          */
 972         bool has_user = this->HasUser(user);
 973
 974         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 975         {
 976                 if ((!has_user) && (i->first->IsModeSet('i')))
 977                 {
 978                         /*
 979                          * user is +i, and source not on the channel, does not show
 980                          * nick in NAMES list
 981                          */
 982                         continue;
 983                 }
 984
 985                 if (i->first->Visibility && !i->first->Visibility->VisibleTo(user))
 986                         continue;
 987
 988                 std::string prefixlist = this->GetPrefixChar(i->first);
 989                 std::string nick = i->first->nick;
 990
 991                 if (call_modules)
 992                 {
 993                         FOREACH_MOD(I_OnNamesListItem, OnNamesListItem(user, i->first, this, prefixlist, nick));
 994
 995                         /* Nick was nuked, a module wants us to skip it */
 996                         if (nick.empty())
 997                                 continue;
 998                 }
 999
1000                 size_t ptrlen = 0;
1001
1002                 if (curlen + prefixlist.length() + nick.length() + 1 > 480)
1003                 {
1004                         /* list overflowed into multiple numerics */
1005                         user->WriteServ(std::string(list));
1006
1007                         /* reset our lengths */
1008                         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=', this->name.c_str());
1009                         ptr = list + dlen;
1010
1011                         ptrlen = 0;
1012                         numusers = 0;
1013                 }
1014
1015                 ptrlen = snprintf(ptr, MAXBUF, "%s%s ", prefixlist.c_str(), nick.c_str());
1016
1017                 curlen += ptrlen;
1018                 ptr += ptrlen;
1019
1020                 numusers++;
1021         }
1022
1023         /* if whats left in the list isnt empty, send it */
1024         if (numusers)
1025         {
1026                 user->WriteNumeric(RPL_NAMREPLY, std::string(list));
1027         }
1028
1029         user->WriteNumeric(RPL_ENDOFNAMES, "%s %s :End of /NAMES list.", user->nick.c_str(), this->name.c_str());
1030 }
1031
1032 long Channel::GetMaxBans()
1033 {
1034         /* Return the cached value if there is one */
1035         if (this->maxbans)
1036                 return this->maxbans;
1037
1038         /* If there isnt one, we have to do some O(n) hax to find it the first time. (ick) */
1039         for (std::map<std::string,int>::iterator n = ServerInstance->Config->maxbans.begin(); n != ServerInstance->Config->maxbans.end(); n++)
1040         {
1041                 if (match(this->name,n->first))
1042                 {
1043                         this->maxbans = n->second;
1044                         return n->second;
1045                 }
1046         }
1047
1048         /* Screw it, just return the default of 64 */
1049         this->maxbans = 64;
1050         return this->maxbans;
1051 }
1052
1053 void Channel::ResetMaxBans()
1054 {
1055         this->maxbans = 0;
1056 }
1057
1058 /* returns the status character for a given user on a channel, e.g. @ for op,
1059  * % for halfop etc. If the user has several modes set, the highest mode
1060  * the user has must be returned.
1061  */
1062 const char* Channel::GetPrefixChar(User *user)
1063 {
1064         static char pf[2] = {0, 0};
1065
1066         prefixlist::iterator n = prefixes.find(user);
1067         if (n != prefixes.end())
1068         {
1069                 if (n->second.size())
1070                 {
1071                         /* If the user has any prefixes, their highest prefix
1072                          * will always be at the head of the list, as the list is
1073                          * sorted in rank order highest first (see SetPrefix()
1074                          * for reasons why)
1075                          */
1076                         *pf = n->second.begin()->first;
1077                         return pf;
1078                 }
1079         }
1080
1081         *pf = 0;
1082         return pf;
1083 }
1084
1085
1086 const char* Channel::GetAllPrefixChars(User* user)
1087 {
1088         static char prefix[MAXBUF];
1089         int ctr = 0;
1090         *prefix = 0;
1091
1092         prefixlist::iterator n = prefixes.find(user);
1093         if (n != prefixes.end())
1094         {
1095                 for (std::vector<prefixtype>::iterator x = n->second.begin(); x != n->second.end(); x++)
1096                 {
1097                         prefix[ctr++] = x->first;
1098                 }
1099         }
1100
1101         prefix[ctr] = 0;
1102
1103         return prefix;
1104 }
1105
1106 unsigned int Channel::GetPrefixValue(User* user)
1107 {
1108         prefixlist::iterator n = prefixes.find(user);
1109         if (n != prefixes.end())
1110         {
1111                 if (n->second.size())
1112                         return n->second.begin()->second;
1113         }
1114         return 0;
1115 }
1116
1117 int Channel::GetStatusFlags(User *user)
1118 {
1119         UCListIter i = user->chans.find(this);
1120         if (i != user->chans.end())
1121         {
1122                 return i->second;
1123         }
1124         return 0;
1125 }
1126
1127 int Channel::GetStatus(User *user)
1128 {
1129         if (ServerInstance->ULine(user->server))
1130                 return STATUS_OP;
1131
1132         UCListIter i = user->chans.find(this);
1133         if (i != user->chans.end())
1134         {
1135                 if ((i->second & UCMODE_OP) > 0)
1136                 {
1137                         return STATUS_OP;
1138                 }
1139                 if ((i->second & UCMODE_HOP) > 0)
1140                 {
1141                         return STATUS_HOP;
1142                 }
1143                 if ((i->second & UCMODE_VOICE) > 0)
1144                 {
1145                         return STATUS_VOICE;
1146                 }
1147                 return STATUS_NORMAL;
1148         }
1149         return STATUS_NORMAL;
1150 }
1151
1152 void Channel::SetPrefix(User* user, char prefix, unsigned int prefix_value, bool adding)
1153 {
1154         prefixlist::iterator n = prefixes.find(user);
1155         prefixtype pfx = std::make_pair(prefix,prefix_value);
1156         if (adding)
1157         {
1158                 if (n != prefixes.end())
1159                 {
1160                         if (std::find(n->second.begin(), n->second.end(), pfx) == n->second.end())
1161                         {
1162                                 n->second.push_back(pfx);
1163                                 /* We must keep prefixes in rank order, largest first.
1164                                  * This is for two reasons, firstly because x-chat *ass-u-me's* this
1165                                  * state, and secondly it turns out to be a benefit to us later.
1166                                  * See above in GetPrefix().
1167                                  */
1168                                 std::sort(n->second.begin(), n->second.end(), ModeParser::PrefixComparison);
1169                         }
1170                 }
1171                 else
1172                 {
1173                         pfxcontainer one;
1174                         one.push_back(pfx);
1175                         prefixes.insert(std::make_pair<User*,pfxcontainer>(user, one));
1176                 }
1177         }
1178         else
1179         {
1180                 if (n != prefixes.end())
1181                 {
1182                         pfxcontainer::iterator x = std::find(n->second.begin(), n->second.end(), pfx);
1183                         if (x != n->second.end())
1184                                 n->second.erase(x);
1185                 }
1186         }
1187 }
1188
1189 void Channel::RemoveAllPrefixes(User* user)
1190 {
1191         prefixlist::iterator n = prefixes.find(user);
1192         if (n != prefixes.end())
1193         {
1194                 prefixes.erase(n);
1195         }
1196 }
1197