src/channels.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 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 "mode.h"
  19
  20 Channel::Channel(InspIRCd* Instance, const std::string &cname, time_t ts) : ServerInstance(Instance)
  21 {
  22         chan_hash::iterator findchan = ServerInstance->chanlist->find(cname);
  23         if (findchan != Instance->chanlist->end())
  24                 throw CoreException("Cannot create duplicate channel " + cname);
  25
  26         (*(ServerInstance->chanlist))[cname.c_str()] = this;
  27         this->name.assign(cname, 0, ServerInstance->Config->Limits.ChanMax);
  28         this->age = ts ? ts : ServerInstance->Time();
  29
  30         maxbans = topicset = 0;
  31         modes.reset();
  32 }
  33
  34 void Channel::SetMode(char mode,bool mode_on)
  35 {
  36         modes[mode-65] = mode_on;
  37         if (!mode_on)
  38                 this->SetModeParam(mode,"",false);
  39 }
  40
  41
  42 void Channel::SetModeParam(char mode,const char* parameter,bool mode_on)
  43 {
  44         CustomModeList::iterator n = custom_mode_params.find(mode);
  45
  46         if (mode_on)
  47         {
  48                 if (n == custom_mode_params.end())
  49                         custom_mode_params[mode] = strdup(parameter);
  50         }
  51         else
  52         {
  53                 if (n != custom_mode_params.end())
  54                 {
  55                         free(n->second);
  56                         custom_mode_params.erase(n);
  57                 }
  58         }
  59 }
  60
  61 bool Channel::IsModeSet(char mode)
  62 {
  63         return modes[mode-65];
  64 }
  65
  66 std::string Channel::GetModeParameter(char mode)
  67 {
  68         CustomModeList::iterator n = custom_mode_params.find(mode);
  69         if (n != custom_mode_params.end())
  70                 return n->second;
  71         return "";
  72 }
  73
  74 int Channel::SetTopic(User *u, std::string &ntopic, bool forceset)
  75 {
  76         if (u && IS_LOCAL(u))
  77         {
  78                 if(!forceset)
  79                 {
  80                         int MOD_RESULT = 0;
  81                         /* 0: check status, 1: don't, -1: disallow change silently */
  82
  83                         FOREACH_RESULT(I_OnLocalTopicChange,OnLocalTopicChange(u,this,ntopic));
  84
  85                         if (MOD_RESULT == 1)
  86                                 return CMD_FAILURE;
  87                         else if (MOD_RESULT == 0)
  88                         {
  89                                 if (!this->HasUser(u))
  90                                 {
  91                                         u->WriteNumeric(442, "%s %s :You're not on that channel!",u->nick.c_str(), this->name.c_str());
  92                                         return CMD_FAILURE;
  93                                 }
  94                                 if ((this->IsModeSet('t')) && (this->GetStatus(u) < STATUS_HOP))
  95                                 {
  96                                         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());
  97                                         return CMD_FAILURE;
  98                                 }
  99                         }
 100                 }
 101         }
 102
 103         this->topic.assign(ntopic, 0, ServerInstance->Config->Limits.MaxTopic);
 104         if (u)
 105         {
 106                 this->setby.assign(ServerInstance->Config->FullHostInTopic ? u->GetFullHost() : u->nick, 0, 128);
 107                 this->WriteChannel(u, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
 108         }
 109         else
 110         {
 111                 this->setby.assign(ServerInstance->Config->ServerName);
 112                 this->WriteChannelWithServ(ServerInstance->Config->ServerName, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
 113         }
 114
 115         this->topicset = ServerInstance->Time();
 116
 117         if (u && IS_LOCAL(u))
 118         {
 119                 FOREACH_MOD(I_OnPostLocalTopicChange,OnPostLocalTopicChange(u, this, this->topic));
 120         }
 121
 122         return CMD_SUCCESS;
 123 }
 124
 125 long Channel::GetUserCounter()
 126 {
 127         return (this->internal_userlist.size());
 128 }
 129
 130 void Channel::AddUser(User* user)
 131 {
 132         internal_userlist[user] = user->nick;
 133 }
 134
 135 unsigned long Channel::DelUser(User* user)
 136 {
 137         CUListIter a = internal_userlist.find(user);
 138
 139         if (a != internal_userlist.end())
 140         {
 141                 internal_userlist.erase(a);
 142                 /* And tidy any others... */
 143                 DelOppedUser(user);
 144                 DelHalfoppedUser(user);
 145                 DelVoicedUser(user);
 146         }
 147
 148         return internal_userlist.size();
 149 }
 150
 151 bool Channel::HasUser(User* user)
 152 {
 153         return (internal_userlist.find(user) != internal_userlist.end());
 154 }
 155
 156 void Channel::AddOppedUser(User* user)
 157 {
 158         internal_op_userlist[user] = user->nick;
 159 }
 160
 161 void Channel::DelOppedUser(User* user)
 162 {
 163         CUListIter a = internal_op_userlist.find(user);
 164         if (a != internal_op_userlist.end())
 165         {
 166                 internal_op_userlist.erase(a);
 167                 return;
 168         }
 169 }
 170
 171 void Channel::AddHalfoppedUser(User* user)
 172 {
 173         internal_halfop_userlist[user] = user->nick;
 174 }
 175
 176 void Channel::DelHalfoppedUser(User* user)
 177 {
 178         CUListIter a = internal_halfop_userlist.find(user);
 179
 180         if (a != internal_halfop_userlist.end())
 181         {
 182                 internal_halfop_userlist.erase(a);
 183         }
 184 }
 185
 186 void Channel::AddVoicedUser(User* user)
 187 {
 188         internal_voice_userlist[user] = user->nick;
 189 }
 190
 191 void Channel::DelVoicedUser(User* user)
 192 {
 193         CUListIter a = internal_voice_userlist.find(user);
 194
 195         if (a != internal_voice_userlist.end())
 196         {
 197                 internal_voice_userlist.erase(a);
 198         }
 199 }
 200
 201 CUList* Channel::GetUsers()
 202 {
 203         return &internal_userlist;
 204 }
 205
 206 CUList* Channel::GetOppedUsers()
 207 {
 208         return &internal_op_userlist;
 209 }
 210
 211 CUList* Channel::GetHalfoppedUsers()
 212 {
 213         return &internal_halfop_userlist;
 214 }
 215
 216 CUList* Channel::GetVoicedUsers()
 217 {
 218         return &internal_voice_userlist;
 219 }
 220
 221 void Channel::SetDefaultModes()
 222 {
 223         ServerInstance->Logs->Log("CHANNELS", DEBUG, "SetDefaultModes %s", ServerInstance->Config->DefaultModes);
 224         irc::spacesepstream list(ServerInstance->Config->DefaultModes);
 225         std::string modeseq;
 226         std::string parameter;
 227
 228         list.GetToken(modeseq);
 229
 230         for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
 231         {
 232                 ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
 233                 if (mode)
 234                 {
 235                         if (mode->GetNumParams(true))
 236                                 list.GetToken(parameter);
 237                         else
 238                                 parameter.clear();
 239
 240                         mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, this, parameter, true);
 241                 }
 242         }
 243 }
 244
 245 /*
 246  * add a channel to a user, creating the record for it if needed and linking
 247  * it to the user record
 248  */
 249 Channel* Channel::JoinUser(InspIRCd* Instance, User *user, const char* cn, bool override, const char* key, bool bursting, time_t TS)
 250 {
 251         if (!user || !cn)
 252                 return NULL;
 253
 254         char cname[MAXBUF];
 255         int MOD_RESULT = 0;
 256         std::string privs;
 257         Channel *Ptr;
 258
 259         /*
 260          * We don't restrict the number of channels that remote users or users that are override-joining may be in.
 261          * We restrict local users to MaxChans channels.
 262          * We restrict local operators to OperMaxChans channels.
 263          * This is a lot more logical than how it was formerly. -- w00t
 264          */
 265         if (IS_LOCAL(user) && !override)
 266         {
 267                 // Checking MyClass exists because we *may* get here with NULL, not 100% sure.
 268                 if (user->MyClass && user->MyClass->GetMaxChans())
 269                 {
 270                         if (user->chans.size() >= user->MyClass->GetMaxChans())
 271                         {
 272                                 user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 273                                 return NULL;
 274                         }
 275                 }
 276                 else
 277                 {
 278                         if (user->HasPrivPermission("channels/high-join-limit"))
 279                         {
 280                                 if (user->chans.size() >= Instance->Config->OperMaxChans)
 281                                 {
 282                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 283                                         return NULL;
 284                                 }
 285                         }
 286                         else
 287                         {
 288                                 if (user->chans.size() >= Instance->Config->MaxChans)
 289                                 {
 290                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
 291                                         return NULL;
 292                                 }
 293                         }
 294                 }
 295         }
 296
 297         strlcpy(cname, cn, Instance->Config->Limits.ChanMax);
 298         Ptr = Instance->FindChan(cname);
 299         bool created_by_local = false;
 300
 301         if (!Ptr)
 302         {
 303                 /*
 304                  * Fix: desync bug was here, don't set @ on remote users - spanningtree handles their permissions. bug #358. -- w00t
 305                  */
 306                 if (!IS_LOCAL(user))
 307                 {
 308                         if (!TS)
 309                                 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);
 310                 }
 311                 else
 312                 {
 313                         privs = "@";
 314                         created_by_local = true;
 315                 }
 316
 317                 if (IS_LOCAL(user) && override == false)
 318                 {
 319                         MOD_RESULT = 0;
 320                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, NULL, cname, privs, key ? key : ""));
 321                         if (MOD_RESULT == 1)
 322                                 return NULL;
 323                 }
 324
 325                 Ptr = new Channel(Instance, cname, TS);
 326         }
 327         else
 328         {
 329                 /* Already on the channel */
 330                 if (Ptr->HasUser(user))
 331                         return NULL;
 332
 333                 /*
 334                  * remote users are allowed us to bypass channel modes
 335                  * and bans (used by servers)
 336                  */
 337                 if (IS_LOCAL(user) && override == false)
 338                 {
 339                         MOD_RESULT = 0;
 340                         FOREACH_RESULT_I(Instance,I_OnUserPreJoin, OnUserPreJoin(user, Ptr, cname, privs, key ? key : ""));
 341                         if (MOD_RESULT == 1)
 342                         {
 343                                 return NULL;
 344                         }
 345                         else if (MOD_RESULT == 0)
 346                         {
 347                                 std::string ckey = Ptr->GetModeParameter('k');
 348                                 bool invited = user->IsInvited(Ptr->name.c_str());
 349                                 bool can_bypass = Instance->Config->InvBypassModes && invited;
 350
 351                                 if (!ckey.empty())
 352                                 {
 353                                         MOD_RESULT = 0;
 354                                         FOREACH_RESULT_I(Instance, I_OnCheckKey, OnCheckKey(user, Ptr, key ? key : ""));
 355                                         if (!MOD_RESULT)
 356                                         {
 357                                                 // If no key provided, or key is not the right one, and can't bypass +k (not invited or option not enabled)
 358                                                 if ((!key || ckey != key) && !can_bypass)
 359                                                 {
 360                                                         user->WriteNumeric(ERR_BADCHANNELKEY, "%s %s :Cannot join channel (Incorrect channel key)",user->nick.c_str(), Ptr->name.c_str());
 361                                                         return NULL;
 362                                                 }
 363                                         }
 364                                 }
 365
 366                                 if (Ptr->IsModeSet('i'))
 367                                 {
 368                                         MOD_RESULT = 0;
 369                                         FOREACH_RESULT_I(Instance,I_OnCheckInvite,OnCheckInvite(user, Ptr));
 370                                         if (!MOD_RESULT)
 371                                         {
 372                                                 if (!invited)
 373                                                 {
 374                                                         user->WriteNumeric(ERR_INVITEONLYCHAN, "%s %s :Cannot join channel (Invite only)",user->nick.c_str(), Ptr->name.c_str());
 375                                                         return NULL;
 376                                                 }
 377                                         }
 378                                 }
 379
 380                                 std::string limit = Ptr->GetModeParameter('l');
 381                                 if (!limit.empty())
 382                                 {
 383                                         MOD_RESULT = 0;
 384                                         FOREACH_RESULT_I(Instance, I_OnCheckLimit, OnCheckLimit(user, Ptr));
 385                                         if (!MOD_RESULT)
 386                                         {
 387                                                 long llimit = atol(limit.c_str());
 388                                                 if (Ptr->GetUserCounter() >= llimit && !can_bypass)
 389                                                 {
 390                                                         user->WriteNumeric(ERR_CHANNELISFULL, "%s %s :Cannot join channel (Channel is full)",user->nick.c_str(), Ptr->name.c_str());
 391                                                         return NULL;
 392                                                 }
 393                                         }
 394                                 }
 395
 396                                 if (Ptr->bans.size())
 397                                 {
 398                                         if (Ptr->IsBanned(user) && !can_bypass)
 399                                         {
 400                                                 user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s %s :Cannot join channel (You're banned)",user->nick.c_str(), Ptr->name.c_str());
 401                                                 return NULL;
 402                                         }
 403                                 }
 404
 405                                 /*
 406                                  * If the user has invites for this channel, remove them now
 407                                  * after a successful join so they don't build up.
 408                                  */
 409                                 if (invited)
 410                                 {
 411                                         user->RemoveInvite(Ptr->name.c_str());
 412                                 }
 413                         }
 414                 }
 415         }
 416
 417         if (created_by_local)
 418         {
 419                 /* As spotted by jilles, dont bother to set this on remote users */
 420                 Ptr->SetDefaultModes();
 421         }
 422
 423         return Channel::ForceChan(Instance, Ptr, user, privs, bursting);
 424 }
 425
 426 Channel* Channel::ForceChan(InspIRCd* Instance, Channel* Ptr, User* user, const std::string &privs, bool bursting)
 427 {
 428         std::string nick = user->nick;
 429         bool silent = false;
 430
 431         Ptr->AddUser(user);
 432
 433         /* Just in case they have no permissions */
 434         user->chans[Ptr] = 0;
 435
 436         for (std::string::const_iterator x = privs.begin(); x != privs.end(); x++)
 437         {
 438                 const char status = *x;
 439                 ModeHandler* mh = Instance->Modes->FindPrefix(status);
 440                 if (mh)
 441                 {
 442                         /* Set, and make sure that the mode handler knows this mode was now set */
 443                         Ptr->SetPrefix(user, status, mh->GetPrefixRank(), true);
 444                         mh->OnModeChange(Instance->FakeClient, Instance->FakeClient, Ptr, nick, true);
 445
 446                         switch (mh->GetPrefix())
 447                         {
 448                                 /* These logic ops are SAFE IN THIS CASE because if the entry doesnt exist,
 449                                  * addressing operator[] creates it. If they do exist, it points to it.
 450                                  * At all other times where we dont want to create an item if it doesnt exist, we
 451                                  * must stick to ::find().
 452                                  */
 453                                 case '@':
 454                                         user->chans[Ptr] |= UCMODE_OP;
 455                                 break;
 456                                 case '%':
 457                                         user->chans[Ptr] |= UCMODE_HOP;
 458                                 break;
 459                                 case '+':
 460                                         user->chans[Ptr] |= UCMODE_VOICE;
 461                                 break;
 462                         }
 463                 }
 464         }
 465
 466         FOREACH_MOD_I(Instance,I_OnUserJoin,OnUserJoin(user, Ptr, bursting, silent));
 467
 468         if (!silent)
 469                 Ptr->WriteChannel(user,"JOIN :%s",Ptr->name.c_str());
 470
 471         /* Theyre not the first ones in here, make sure everyone else sees the modes we gave the user */
 472         std::string ms = Instance->Modes->ModeString(user, Ptr);
 473         if ((Ptr->GetUserCounter() > 1) && (ms.length()))
 474                 Ptr->WriteAllExceptSender(user, true, 0, "MODE %s +%s", Ptr->name.c_str(), ms.c_str());
 475
 476         /* Major improvement by Brain - we dont need to be calculating all this pointlessly for remote users */
 477         if (IS_LOCAL(user))
 478         {
 479                 if (Ptr->topicset)
 480                 {
 481                         user->WriteNumeric(RPL_TOPIC, "%s %s :%s", user->nick.c_str(), Ptr->name.c_str(), Ptr->topic.c_str());
 482                         user->WriteNumeric(RPL_TOPICTIME, "%s %s %s %lu", user->nick.c_str(), Ptr->name.c_str(), Ptr->setby.c_str(), (unsigned long)Ptr->topicset);
 483                 }
 484                 Ptr->UserList(user);
 485         }
 486         FOREACH_MOD_I(Instance,I_OnPostJoin,OnPostJoin(user, Ptr));
 487         return Ptr;
 488 }
 489
 490 bool Channel::IsBanned(User* user)
 491 {
 492         int result = 0;
 493         FOREACH_RESULT_MAP(I_OnCheckBan, OnCheckBan(user, this),
 494                 result = banmatch_reduce(result, MOD_RESULT);
 495         );
 496
 497         if (result)
 498                 return (result < 0);
 499
 500         char mask[MAXBUF];
 501         snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 502         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 503         {
 504                 if ((InspIRCd::Match(user->GetFullHost(),i->data, NULL)) || // host
 505                         (InspIRCd::Match(user->GetFullRealHost(),i->data, NULL)) || // uncloaked host
 506                         (InspIRCd::MatchCIDR(mask, i->data, NULL))) // ip
 507                 {
 508                         return true;
 509                 }
 510         }
 511         return false;
 512 }
 513
 514 int Channel::GetExtBanStatus(const std::string &str, char type)
 515 {
 516         int result = 0;
 517         FOREACH_RESULT_MAP(I_OnCheckStringExtBan, OnCheckStringExtBan(str, this, type),
 518                 result = banmatch_reduce(result, MOD_RESULT);
 519         );
 520
 521         if (result)
 522                 return result;
 523
 524         // nobody decided for us, check the ban list
 525         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
 526         {
 527                 if (i->data[0] != type || i->data[1] != ':')
 528                         continue;
 529
 530                 std::string maskptr = i->data.substr(2);
 531                 ServerInstance->Logs->Log("EXTBANS", DEBUG, "Checking %s against %s, type is %c", str.c_str(), maskptr.c_str(), type);
 532
 533                 if (InspIRCd::Match(str, maskptr, NULL))
 534                         return -1;
 535         }
 536
 537         return 0;
 538 }
 539
 540 int Channel::GetExtBanStatus(User *user, char type)
 541 {
 542         int result = 0;
 543         FOREACH_RESULT_MAP(I_OnCheckExtBan, OnCheckExtBan(user, this, type),
 544                 result = banmatch_reduce(result, MOD_RESULT);
 545         );
 546
 547         if (result)
 548                 return result;
 549
 550         char mask[MAXBUF];
 551         int rv = 0;
 552         snprintf(mask, MAXBUF, "%s!%s@%s", user->nick.c_str(), user->ident.c_str(), user->GetIPString());
 553
 554         // XXX: we should probably hook cloaked hosts in here somehow too..
 555         rv = banmatch_reduce(rv, this->GetExtBanStatus(mask, type));
 556         rv = banmatch_reduce(rv, this->GetExtBanStatus(user->GetFullHost(), type));
 557         rv = banmatch_reduce(rv, this->GetExtBanStatus(user->GetFullRealHost(), type));
 558         return rv;
 559 }
 560
 561 /* Channel::PartUser
 562  * remove a channel from a users record, and return the number of users left.
 563  * Therefore, if this function returns 0 the caller should delete the Channel.
 564  */
 565 long Channel::PartUser(User *user, std::string &reason)
 566 {
 567         bool silent = false;
 568
 569         if (!user)
 570                 return this->GetUserCounter();
 571
 572         UCListIter i = user->chans.find(this);
 573         if (i != user->chans.end())
 574         {
 575                 FOREACH_MOD(I_OnUserPart,OnUserPart(user, this, reason, silent));
 576
 577                 if (!silent)
 578                         this->WriteChannel(user, "PART %s%s%s", this->name.c_str(), reason.empty() ? "" : " :", reason.c_str());
 579
 580                 user->chans.erase(i);
 581                 this->RemoveAllPrefixes(user);
 582         }
 583
 584         if (!this->DelUser(user)) /* if there are no users left on the channel... */
 585         {
 586                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 587                 /* kill the record */
 588                 if (iter != ServerInstance->chanlist->end())
 589                 {
 590                         int MOD_RESULT = 0;
 591                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 592                         if (MOD_RESULT == 1)
 593                                 return 1; // delete halted by module
 594                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 595                         ServerInstance->chanlist->erase(iter);
 596                 }
 597                 return 0;
 598         }
 599
 600         return this->GetUserCounter();
 601 }
 602
 603 long Channel::ServerKickUser(User* user, const char* reason, bool triggerevents, const char* servername)
 604 {
 605         bool silent = false;
 606
 607         if (!user || !reason)
 608                 return this->GetUserCounter();
 609
 610         if (IS_LOCAL(user))
 611         {
 612                 if (!this->HasUser(user))
 613                 {
 614                         /* Not on channel */
 615                         return this->GetUserCounter();
 616                 }
 617         }
 618
 619         if (servername == NULL || *ServerInstance->Config->HideWhoisServer)
 620                 servername = ServerInstance->Config->ServerName;
 621
 622         if (triggerevents)
 623         {
 624                 FOREACH_MOD(I_OnUserKick,OnUserKick(NULL, user, this, reason, silent));
 625         }
 626
 627         UCListIter i = user->chans.find(this);
 628         if (i != user->chans.end())
 629         {
 630                 if (!silent)
 631                         this->WriteChannelWithServ(servername, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 632
 633                 user->chans.erase(i);
 634                 this->RemoveAllPrefixes(user);
 635         }
 636
 637         if (!this->DelUser(user))
 638         {
 639                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
 640                 /* kill the record */
 641                 if (iter != ServerInstance->chanlist->end())
 642                 {
 643                         int MOD_RESULT = 0;
 644                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 645                         if (MOD_RESULT == 1)
 646                                 return 1; // delete halted by module
 647                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 648                         ServerInstance->chanlist->erase(iter);
 649                 }
 650                 return 0;
 651         }
 652
 653         return this->GetUserCounter();
 654 }
 655
 656 long Channel::KickUser(User *src, User *user, const char* reason)
 657 {
 658         bool silent = false;
 659
 660         if (!src || !user || !reason)
 661                 return this->GetUserCounter();
 662
 663         if (IS_LOCAL(src))
 664         {
 665                 if (!this->HasUser(user))
 666                 {
 667                         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());
 668                         return this->GetUserCounter();
 669                 }
 670                 if ((ServerInstance->ULine(user->server)) && (!ServerInstance->ULine(src->server)))
 671                 {
 672                         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());
 673                         return this->GetUserCounter();
 674                 }
 675                 int MOD_RESULT = 0;
 676
 677                 if (!ServerInstance->ULine(src->server))
 678                 {
 679                         MOD_RESULT = 0;
 680                         FOREACH_RESULT(I_OnUserPreKick,OnUserPreKick(src,user,this,reason));
 681                         if (MOD_RESULT == 1)
 682                                 return this->GetUserCounter();
 683                 }
 684                 /* Set to -1 by OnUserPreKick if explicit allow was set */
 685                 if (MOD_RESULT != -1)
 686                 {
 687                         FOREACH_RESULT(I_OnAccessCheck,OnAccessCheck(src,user,this,AC_KICK));
 688                         if ((MOD_RESULT == ACR_DENY) && (!ServerInstance->ULine(src->server)))
 689                                 return this->GetUserCounter();
 690
 691                         if ((MOD_RESULT == ACR_DEFAULT) || (!ServerInstance->ULine(src->server)))
 692                         {
 693                                 int them = this->GetStatus(src);
 694                                 int us = this->GetStatus(user);
 695                                 if ((them < STATUS_HOP) || (them < us))
 696                                 {
 697                                         src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :You must be a channel %soperator",src->nick.c_str(), this->name.c_str(), them == STATUS_HOP ? "" : "half-");
 698                                         return this->GetUserCounter();
 699                                 }
 700                         }
 701                 }
 702         }
 703
 704         FOREACH_MOD(I_OnUserKick,OnUserKick(src, user, this, reason, silent));
 705
 706         UCListIter i = user->chans.find(this);
 707         if (i != user->chans.end())
 708         {
 709                 /* zap it from the channel list of the user */
 710                 if (!silent)
 711                         this->WriteChannel(src, "KICK %s %s :%s", this->name.c_str(), user->nick.c_str(), reason);
 712
 713                 user->chans.erase(i);
 714                 this->RemoveAllPrefixes(user);
 715         }
 716
 717         if (!this->DelUser(user))
 718         /* if there are no users left on the channel */
 719         {
 720                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name.c_str());
 721
 722                 /* kill the record */
 723                 if (iter != ServerInstance->chanlist->end())
 724                 {
 725                         int MOD_RESULT = 0;
 726                         FOREACH_RESULT_I(ServerInstance,I_OnChannelPreDelete, OnChannelPreDelete(this));
 727                         if (MOD_RESULT == 1)
 728                                 return 1; // delete halted by module
 729                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
 730                         ServerInstance->chanlist->erase(iter);
 731                 }
 732                 return 0;
 733         }
 734
 735         return this->GetUserCounter();
 736 }
 737
 738 void Channel::WriteChannel(User* user, const char* text, ...)
 739 {
 740         char textbuffer[MAXBUF];
 741         va_list argsPtr;
 742
 743         if (!user || !text)
 744                 return;
 745
 746         va_start(argsPtr, text);
 747         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 748         va_end(argsPtr);
 749
 750         this->WriteChannel(user, std::string(textbuffer));
 751 }
 752
 753 void Channel::WriteChannel(User* user, const std::string &text)
 754 {
 755         CUList *ulist = this->GetUsers();
 756         char tb[MAXBUF];
 757
 758         if (!user)
 759                 return;
 760
 761         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 762         std::string out = tb;
 763
 764         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 765         {
 766                 if (IS_LOCAL(i->first))
 767                         i->first->Write(out);
 768         }
 769 }
 770
 771 void Channel::WriteChannelWithServ(const char* ServName, const char* text, ...)
 772 {
 773         char textbuffer[MAXBUF];
 774         va_list argsPtr;
 775
 776         if (!text)
 777                 return;
 778
 779         va_start(argsPtr, text);
 780         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 781         va_end(argsPtr);
 782
 783         this->WriteChannelWithServ(ServName, std::string(textbuffer));
 784 }
 785
 786 void Channel::WriteChannelWithServ(const char* ServName, const std::string &text)
 787 {
 788         CUList *ulist = this->GetUsers();
 789         char tb[MAXBUF];
 790
 791         snprintf(tb,MAXBUF,":%s %s", ServName ? ServName : ServerInstance->Config->ServerName, text.c_str());
 792         std::string out = tb;
 793
 794         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 795         {
 796                 if (IS_LOCAL(i->first))
 797                         i->first->Write(out);
 798         }
 799 }
 800
 801 /* write formatted text from a source user to all users on a channel except
 802  * for the sender (for privmsg etc) */
 803 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const char* text, ...)
 804 {
 805         char textbuffer[MAXBUF];
 806         va_list argsPtr;
 807
 808         if (!text)
 809                 return;
 810
 811         va_start(argsPtr, text);
 812         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 813         va_end(argsPtr);
 814
 815         this->WriteAllExceptSender(user, serversource, status, std::string(textbuffer));
 816 }
 817
 818 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const char* text, ...)
 819 {
 820         char textbuffer[MAXBUF];
 821         va_list argsPtr;
 822
 823         if (!text)
 824                 return;
 825
 826         va_start(argsPtr, text);
 827         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
 828         va_end(argsPtr);
 829
 830         this->WriteAllExcept(user, serversource, status, except_list, std::string(textbuffer));
 831 }
 832
 833 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &text)
 834 {
 835         CUList *ulist = this->GetUsers();
 836         char tb[MAXBUF];
 837
 838         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
 839         std::string out = tb;
 840
 841         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 842         {
 843                 if ((IS_LOCAL(i->first)) && (except_list.find(i->first) == except_list.end()))
 844                 {
 845                         /* User doesnt have the status we're after */
 846                         if (status && !strchr(this->GetAllPrefixChars(i->first), status))
 847                                 continue;
 848
 849                         if (serversource)
 850                                 i->first->WriteServ(text);
 851                         else
 852                                 i->first->Write(out);
 853                 }
 854         }
 855 }
 856
 857 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const std::string& text)
 858 {
 859         CUList except_list;
 860         except_list[user] = user->nick;
 861         this->WriteAllExcept(user, serversource, status, except_list, std::string(text));
 862 }
 863
 864 /*
 865  * return a count of the users on a specific channel accounting for
 866  * invisible users who won't increase the count. e.g. for /LIST
 867  */
 868 int Channel::CountInvisible()
 869 {
 870         int count = 0;
 871         CUList *ulist= this->GetUsers();
 872         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 873         {
 874                 if (!(i->first->IsModeSet('i')))
 875                         count++;
 876         }
 877
 878         return count;
 879 }
 880
 881 char* Channel::ChanModes(bool showkey)
 882 {
 883         static char scratch[MAXBUF];
 884         static char sparam[MAXBUF];
 885         char* offset = scratch;
 886         std::string extparam;
 887
 888         *scratch = '\0';
 889         *sparam = '\0';
 890
 891         /* This was still iterating up to 190, Channel::modes is only 64 elements -- Om */
 892         for(int n = 0; n < 64; n++)
 893         {
 894                 if(this->modes[n])
 895                 {
 896                         *offset++ = n + 65;
 897                         extparam.clear();
 898                         switch (n)
 899                         {
 900                                 case CM_KEY:
 901                                         // Unfortunately this must be special-cased, as we definitely don't want to always display key.
 902                                         if (showkey)
 903                                         {
 904                                                 extparam = this->GetModeParameter('k');
 905                                         }
 906                                         else
 907                                         {
 908                                                 extparam = "<key>";
 909                                         }
 910                                         break;
 911                                 case CM_NOEXTERNAL:
 912                                 case CM_TOPICLOCK:
 913                                 case CM_INVITEONLY:
 914                                 case CM_MODERATED:
 915                                 case CM_SECRET:
 916                                 case CM_PRIVATE:
 917                                         /* We know these have no parameters */
 918                                 break;
 919                                 default:
 920                                         extparam = this->GetModeParameter(n + 65);
 921                                 break;
 922                         }
 923                         if (!extparam.empty())
 924                         {
 925                                 charlcat(sparam,' ',MAXBUF);
 926                                 strlcat(sparam,extparam.c_str(),MAXBUF);
 927                         }
 928                 }
 929         }
 930
 931         /* Null terminate scratch */
 932         *offset = '\0';
 933         strlcat(scratch,sparam,MAXBUF);
 934         return scratch;
 935 }
 936
 937 /* compile a userlist of a channel into a string, each nick seperated by
 938  * spaces and op, voice etc status shown as @ and +, and send it to 'user'
 939  */
 940 void Channel::UserList(User *user, CUList *ulist)
 941 {
 942         char list[MAXBUF];
 943         size_t dlen, curlen;
 944         int MOD_RESULT = 0;
 945         bool call_modules = true;
 946
 947         if (!IS_LOCAL(user))
 948                 return;
 949
 950         FOREACH_RESULT(I_OnUserList,OnUserList(user, this, ulist));
 951         if (MOD_RESULT == 1)
 952                 call_modules = false;
 953
 954         if (MOD_RESULT != -1)
 955         {
 956                 if ((this->IsModeSet('s')) && (!this->HasUser(user)))
 957                 {
 958                         user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel",user->nick.c_str(), this->name.c_str());
 959                         return;
 960                 }
 961         }
 962
 963         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=',  this->name.c_str());
 964
 965         int numusers = 0;
 966         char* ptr = list + dlen;
 967
 968         if (!ulist)
 969                 ulist = this->GetUsers();
 970
 971         /* Improvement by Brain - this doesnt change in value, so why was it inside
 972          * the loop?
 973          */
 974         bool has_user = this->HasUser(user);
 975
 976         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
 977         {
 978                 if ((!has_user) && (i->first->IsModeSet('i')))
 979                 {
 980                         /*
 981                          * user is +i, and source not on the channel, does not show
 982                          * nick in NAMES list
 983                          */
 984                         continue;
 985                 }
 986
 987                 if (i->first->Visibility && !i->first->Visibility->VisibleTo(user))
 988                         continue;
 989
 990                 std::string prefixlist = this->GetPrefixChar(i->first);
 991                 std::string nick = i->first->nick;
 992
 993                 if (call_modules)
 994                 {
 995                         FOREACH_MOD(I_OnNamesListItem, OnNamesListItem(user, i->first, this, prefixlist, nick));
 996
 997                         /* Nick was nuked, a module wants us to skip it */
 998                         if (nick.empty())
 999                                 continue;
1000                 }
1001
1002                 size_t ptrlen = 0;
1003
1004                 if (curlen + prefixlist.length() + nick.length() + 1 > 480)
1005                 {
1006                         /* list overflowed into multiple numerics */
1007                         user->WriteNumeric(RPL_NAMREPLY, std::string(list));
1008
1009                         /* reset our lengths */
1010                         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=', this->name.c_str());
1011                         ptr = list + dlen;
1012
1013                         ptrlen = 0;
1014                         numusers = 0;
1015                 }
1016
1017                 ptrlen = snprintf(ptr, MAXBUF, "%s%s ", prefixlist.c_str(), nick.c_str());
1018
1019                 curlen += ptrlen;
1020                 ptr += ptrlen;
1021
1022                 numusers++;
1023         }
1024
1025         /* if whats left in the list isnt empty, send it */
1026         if (numusers)
1027         {
1028                 user->WriteNumeric(RPL_NAMREPLY, std::string(list));
1029         }
1030
1031         user->WriteNumeric(RPL_ENDOFNAMES, "%s %s :End of /NAMES list.", user->nick.c_str(), this->name.c_str());
1032 }
1033
1034 long Channel::GetMaxBans()
1035 {
1036         /* Return the cached value if there is one */
1037         if (this->maxbans)
1038                 return this->maxbans;
1039
1040         /* If there isnt one, we have to do some O(n) hax to find it the first time. (ick) */
1041         for (std::map<std::string,int>::iterator n = ServerInstance->Config->maxbans.begin(); n != ServerInstance->Config->maxbans.end(); n++)
1042         {
1043                 if (InspIRCd::Match(this->name, n->first, NULL))
1044                 {
1045                         this->maxbans = n->second;
1046                         return n->second;
1047                 }
1048         }
1049
1050         /* Screw it, just return the default of 64 */
1051         this->maxbans = 64;
1052         return this->maxbans;
1053 }
1054
1055 void Channel::ResetMaxBans()
1056 {
1057         this->maxbans = 0;
1058 }
1059
1060 /* returns the status character for a given user on a channel, e.g. @ for op,
1061  * % for halfop etc. If the user has several modes set, the highest mode
1062  * the user has must be returned.
1063  */
1064 const char* Channel::GetPrefixChar(User *user)
1065 {
1066         static char pf[2] = {0, 0};
1067
1068         prefixlist::iterator n = prefixes.find(user);
1069         if (n != prefixes.end())
1070         {
1071                 if (n->second.size())
1072                 {
1073                         /* If the user has any prefixes, their highest prefix
1074                          * will always be at the head of the list, as the list is
1075                          * sorted in rank order highest first (see SetPrefix()
1076                          * for reasons why)
1077                          */
1078                         *pf = n->second.begin()->first;
1079                         return pf;
1080                 }
1081         }
1082
1083         *pf = 0;
1084         return pf;
1085 }
1086
1087
1088 const char* Channel::GetAllPrefixChars(User* user)
1089 {
1090         static char prefix[MAXBUF];
1091         int ctr = 0;
1092         *prefix = 0;
1093
1094         prefixlist::iterator n = prefixes.find(user);
1095         if (n != prefixes.end())
1096         {
1097                 for (std::vector<prefixtype>::iterator x = n->second.begin(); x != n->second.end(); x++)
1098                 {
1099                         prefix[ctr++] = x->first;
1100                 }
1101         }
1102
1103         prefix[ctr] = 0;
1104
1105         return prefix;
1106 }
1107
1108 unsigned int Channel::GetPrefixValue(User* user)
1109 {
1110         prefixlist::iterator n = prefixes.find(user);
1111         if (n != prefixes.end())
1112         {
1113                 if (n->second.size())
1114                         return n->second.begin()->second;
1115         }
1116         return 0;
1117 }
1118
1119 int Channel::GetStatusFlags(User *user)
1120 {
1121         UCListIter i = user->chans.find(this);
1122         if (i != user->chans.end())
1123         {
1124                 return i->second;
1125         }
1126         return 0;
1127 }
1128
1129 int Channel::GetStatus(User *user)
1130 {
1131         if (ServerInstance->ULine(user->server))
1132                 return STATUS_OP;
1133
1134         UCListIter i = user->chans.find(this);
1135         if (i != user->chans.end())
1136         {
1137                 if ((i->second & UCMODE_OP) > 0)
1138                 {
1139                         return STATUS_OP;
1140                 }
1141                 if ((i->second & UCMODE_HOP) > 0)
1142                 {
1143                         return STATUS_HOP;
1144                 }
1145                 if ((i->second & UCMODE_VOICE) > 0)
1146                 {
1147                         return STATUS_VOICE;
1148                 }
1149                 return STATUS_NORMAL;
1150         }
1151         return STATUS_NORMAL;
1152 }
1153
1154 void Channel::SetPrefix(User* user, char prefix, unsigned int prefix_value, bool adding)
1155 {
1156         prefixlist::iterator n = prefixes.find(user);
1157         prefixtype pfx = std::make_pair(prefix,prefix_value);
1158         if (adding)
1159         {
1160                 if (n != prefixes.end())
1161                 {
1162                         if (std::find(n->second.begin(), n->second.end(), pfx) == n->second.end())
1163                         {
1164                                 n->second.push_back(pfx);
1165                                 /* We must keep prefixes in rank order, largest first.
1166                                  * This is for two reasons, firstly because x-chat *ass-u-me's* this
1167                                  * state, and secondly it turns out to be a benefit to us later.
1168                                  * See above in GetPrefix().
1169                                  */
1170                                 std::sort(n->second.begin(), n->second.end(), ModeParser::PrefixComparison);
1171                         }
1172                 }
1173                 else
1174                 {
1175                         pfxcontainer one;
1176                         one.push_back(pfx);
1177                         prefixes.insert(std::make_pair<User*,pfxcontainer>(user, one));
1178                 }
1179         }
1180         else
1181         {
1182                 if (n != prefixes.end())
1183                 {
1184                         pfxcontainer::iterator x = std::find(n->second.begin(), n->second.end(), pfx);
1185                         if (x != n->second.end())
1186                                 n->second.erase(x);
1187                 }
1188         }
1189 }
1190
1191 void Channel::RemoveAllPrefixes(User* user)
1192 {
1193         prefixlist::iterator n = prefixes.find(user);
1194         if (n != prefixes.end())
1195         {
1196                 prefixes.erase(n);
1197         }
1198 }