src/users.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2006-2009 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2006-2007, 2009 Dennis Friis <peavey@inspircd.org>
   7  *   Copyright (C) 2008 John Brooks <john.brooks@dereferenced.net>
   8  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   9  *   Copyright (C) 2008 Oliver Lupton <oliverlupton@gmail.com>
  10  *   Copyright (C) 2003-2008 Craig Edwards <craigedwards@brainbox.cc>
  11  *
  12  * This file is part of InspIRCd.  InspIRCd is free software: you can
  13  * redistribute it and/or modify it under the terms of the GNU General Public
  14  * License as published by the Free Software Foundation, version 2.
  15  *
  16  * This program is distributed in the hope that it will be useful, but WITHOUT
  17  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  18  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25
  26 #include "inspircd.h"
  27 #include "xline.h"
  28
  29 bool User::IsNoticeMaskSet(unsigned char sm)
  30 {
  31         if (!isalpha(sm))
  32                 return false;
  33         return (snomasks[sm-65]);
  34 }
  35
  36 bool User::IsModeSet(unsigned char m)
  37 {
  38         ModeHandler* mh = ServerInstance->Modes->FindMode(m, MODETYPE_USER);
  39         return (mh && modes[mh->GetId()]);
  40 }
  41
  42 const char* User::FormatModes(bool showparameters)
  43 {
  44         static std::string data;
  45         std::string params;
  46         data.clear();
  47
  48         for (unsigned char n = 0; n < 64; n++)
  49         {
  50                 ModeHandler* mh = ServerInstance->Modes->FindMode(n + 65, MODETYPE_USER);
  51                 if (mh && IsModeSet(mh))
  52                 {
  53                         data.push_back(n + 65);
  54                         if (showparameters && mh->NeedsParam(true))
  55                         {
  56                                 std::string p = mh->GetUserParameter(this);
  57                                 if (p.length())
  58                                         params.append(" ").append(p);
  59                         }
  60                 }
  61         }
  62         data += params;
  63         return data.c_str();
  64 }
  65
  66 User::User(const std::string& uid, Server* srv, int type)
  67         : age(ServerInstance->Time())
  68         , signon(0)
  69         , uuid(uid)
  70         , server(srv)
  71         , registered(REG_NONE)
  72         , quitting(false)
  73         , usertype(type)
  74 {
  75         client_sa.sa.sa_family = AF_UNSPEC;
  76
  77         ServerInstance->Logs->Log("USERS", LOG_DEBUG, "New UUID for user: %s", uuid.c_str());
  78
  79         // Do not insert FakeUsers into the uuidlist so FindUUID() won't return them which is the desired behavior
  80         if (type != USERTYPE_SERVER)
  81         {
  82                 if (!ServerInstance->Users.uuidlist.insert(std::make_pair(uuid, this)).second)
  83                         throw CoreException("Duplicate UUID in User constructor: " + uuid);
  84         }
  85 }
  86
  87 LocalUser::LocalUser(int myfd, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* servaddr)
  88         : User(ServerInstance->UIDGen.GetUID(), ServerInstance->FakeClient->server, USERTYPE_LOCAL)
  89         , eh(this)
  90         , bytes_in(0)
  91         , bytes_out(0)
  92         , cmds_in(0)
  93         , cmds_out(0)
  94         , quitting_sendq(false)
  95         , lastping(true)
  96         , exempt(false)
  97         , nping(0)
  98         , idle_lastmsg(0)
  99         , CommandFloodPenalty(0)
 100         , already_sent(0)
 101 {
 102         signon = ServerInstance->Time();
 103         // The user's default nick is their UUID
 104         nick = uuid;
 105         ident = "unknown";
 106         eh.SetFd(myfd);
 107         memcpy(&client_sa, client, sizeof(irc::sockets::sockaddrs));
 108         memcpy(&server_sa, servaddr, sizeof(irc::sockets::sockaddrs));
 109         dhost = host = GetIPString();
 110 }
 111
 112 User::~User()
 113 {
 114 }
 115
 116 const std::string& User::MakeHost()
 117 {
 118         if (!this->cached_makehost.empty())
 119                 return this->cached_makehost;
 120
 121         // XXX: Is there really a need to cache this?
 122         this->cached_makehost = ident + "@" + host;
 123         return this->cached_makehost;
 124 }
 125
 126 const std::string& User::MakeHostIP()
 127 {
 128         if (!this->cached_hostip.empty())
 129                 return this->cached_hostip;
 130
 131         // XXX: Is there really a need to cache this?
 132         this->cached_hostip = ident + "@" + this->GetIPString();
 133         return this->cached_hostip;
 134 }
 135
 136 const std::string& User::GetFullHost()
 137 {
 138         if (!this->cached_fullhost.empty())
 139                 return this->cached_fullhost;
 140
 141         // XXX: Is there really a need to cache this?
 142         this->cached_fullhost = nick + "!" + ident + "@" + dhost;
 143         return this->cached_fullhost;
 144 }
 145
 146 const std::string& User::GetFullRealHost()
 147 {
 148         if (!this->cached_fullrealhost.empty())
 149                 return this->cached_fullrealhost;
 150
 151         // XXX: Is there really a need to cache this?
 152         this->cached_fullrealhost = nick + "!" + ident + "@" + host;
 153         return this->cached_fullrealhost;
 154 }
 155
 156 bool User::HasModePermission(const ModeHandler* mh) const
 157 {
 158         return true;
 159 }
 160
 161 bool LocalUser::HasModePermission(const ModeHandler* mh) const
 162 {
 163         if (!this->IsOper())
 164                 return false;
 165
 166         const unsigned char mode = mh->GetModeChar();
 167         if (mode < 'A' || mode > ('A' + 64)) return false;
 168
 169         return ((mh->GetModeType() == MODETYPE_USER ? oper->AllowedUserModes : oper->AllowedChanModes))[(mode - 'A')];
 170
 171 }
 172 /*
 173  * users on remote servers can completely bypass all permissions based checks.
 174  * This prevents desyncs when one server has different type/class tags to another.
 175  * That having been said, this does open things up to the possibility of source changes
 176  * allowing remote kills, etc - but if they have access to the src, they most likely have
 177  * access to the conf - so it's an end to a means either way.
 178  */
 179 bool User::HasPermission(const std::string&)
 180 {
 181         return true;
 182 }
 183
 184 bool LocalUser::HasPermission(const std::string &command)
 185 {
 186         // are they even an oper at all?
 187         if (!this->IsOper())
 188         {
 189                 return false;
 190         }
 191
 192         if (oper->AllowedOperCommands.find(command) != oper->AllowedOperCommands.end())
 193                 return true;
 194         else if (oper->AllowedOperCommands.find("*") != oper->AllowedOperCommands.end())
 195                 return true;
 196
 197         return false;
 198 }
 199
 200 bool User::HasPrivPermission(const std::string &privstr, bool noisy)
 201 {
 202         return true;
 203 }
 204
 205 bool LocalUser::HasPrivPermission(const std::string &privstr, bool noisy)
 206 {
 207         if (!this->IsOper())
 208         {
 209                 if (noisy)
 210                         this->WriteNotice("You are not an oper");
 211                 return false;
 212         }
 213
 214         if (oper->AllowedPrivs.find(privstr) != oper->AllowedPrivs.end())
 215         {
 216                 return true;
 217         }
 218         else if (oper->AllowedPrivs.find("*") != oper->AllowedPrivs.end())
 219         {
 220                 return true;
 221         }
 222
 223         if (noisy)
 224                 this->WriteNotice("Oper type " + oper->name + " does not have access to priv " + privstr);
 225
 226         return false;
 227 }
 228
 229 void UserIOHandler::OnDataReady()
 230 {
 231         if (user->quitting)
 232                 return;
 233
 234         if (recvq.length() > user->MyClass->GetRecvqMax() && !user->HasPrivPermission("users/flood/increased-buffers"))
 235         {
 236                 ServerInstance->Users->QuitUser(user, "RecvQ exceeded");
 237                 ServerInstance->SNO->WriteToSnoMask('a', "User %s RecvQ of %lu exceeds connect class maximum of %lu",
 238                         user->nick.c_str(), (unsigned long)recvq.length(), user->MyClass->GetRecvqMax());
 239                 return;
 240         }
 241         unsigned long sendqmax = ULONG_MAX;
 242         if (!user->HasPrivPermission("users/flood/increased-buffers"))
 243                 sendqmax = user->MyClass->GetSendqSoftMax();
 244         unsigned long penaltymax = ULONG_MAX;
 245         if (!user->HasPrivPermission("users/flood/no-fakelag"))
 246                 penaltymax = user->MyClass->GetPenaltyThreshold() * 1000;
 247
 248         while (user->CommandFloodPenalty < penaltymax && getSendQSize() < sendqmax)
 249         {
 250                 std::string line;
 251                 line.reserve(ServerInstance->Config->Limits.MaxLine);
 252                 std::string::size_type qpos = 0;
 253                 while (qpos < recvq.length())
 254                 {
 255                         char c = recvq[qpos++];
 256                         switch (c)
 257                         {
 258                         case '\0':
 259                                 c = ' ';
 260                                 break;
 261                         case '\r':
 262                                 continue;
 263                         case '\n':
 264                                 goto eol_found;
 265                         }
 266                         if (line.length() < ServerInstance->Config->Limits.MaxLine - 2)
 267                                 line.push_back(c);
 268                 }
 269                 // if we got here, the recvq ran out before we found a newline
 270                 return;
 271 eol_found:
 272                 // just found a newline. Terminate the string, and pull it out of recvq
 273                 recvq.erase(0, qpos);
 274
 275                 // TODO should this be moved to when it was inserted in recvq?
 276                 ServerInstance->stats.Recv += qpos;
 277                 user->bytes_in += qpos;
 278                 user->cmds_in++;
 279
 280                 ServerInstance->Parser.ProcessBuffer(line, user);
 281                 if (user->quitting)
 282                         return;
 283         }
 284         if (user->CommandFloodPenalty >= penaltymax && !user->MyClass->fakelag)
 285                 ServerInstance->Users->QuitUser(user, "Excess Flood");
 286 }
 287
 288 void UserIOHandler::AddWriteBuf(const std::string &data)
 289 {
 290         if (user->quitting_sendq)
 291                 return;
 292         if (!user->quitting && getSendQSize() + data.length() > user->MyClass->GetSendqHardMax() &&
 293                 !user->HasPrivPermission("users/flood/increased-buffers"))
 294         {
 295                 user->quitting_sendq = true;
 296                 ServerInstance->GlobalCulls.AddSQItem(user);
 297                 return;
 298         }
 299
 300         // We still want to append data to the sendq of a quitting user,
 301         // e.g. their ERROR message that says 'closing link'
 302
 303         WriteData(data);
 304 }
 305
 306 void UserIOHandler::OnError(BufferedSocketError)
 307 {
 308         ServerInstance->Users->QuitUser(user, getError());
 309 }
 310
 311 CullResult User::cull()
 312 {
 313         if (!quitting)
 314                 ServerInstance->Users->QuitUser(this, "Culled without QuitUser");
 315
 316         if (client_sa.sa.sa_family != AF_UNSPEC)
 317                 ServerInstance->Users->RemoveCloneCounts(this);
 318
 319         return Extensible::cull();
 320 }
 321
 322 CullResult LocalUser::cull()
 323 {
 324         eh.cull();
 325         return User::cull();
 326 }
 327
 328 CullResult FakeUser::cull()
 329 {
 330         // Fake users don't quit, they just get culled.
 331         quitting = true;
 332         // Fake users are not inserted into UserManager::clientlist or uuidlist, so we don't need to modify those here
 333         return User::cull();
 334 }
 335
 336 void User::Oper(OperInfo* info)
 337 {
 338         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
 339         if (this->IsModeSet(opermh))
 340                 this->UnOper();
 341
 342         this->SetMode(opermh, true);
 343         this->oper = info;
 344         this->WriteCommand("MODE", "+o");
 345         FOREACH_MOD(OnOper, (this, info->name));
 346
 347         std::string opername;
 348         if (info->oper_block)
 349                 opername = info->oper_block->getString("name");
 350
 351         if (IS_LOCAL(this))
 352         {
 353                 LocalUser* l = IS_LOCAL(this);
 354                 std::string vhost = oper->getConfig("vhost");
 355                 if (!vhost.empty())
 356                         l->ChangeDisplayedHost(vhost);
 357                 std::string opClass = oper->getConfig("class");
 358                 if (!opClass.empty())
 359                         l->SetClass(opClass);
 360         }
 361
 362         ServerInstance->SNO->WriteToSnoMask('o',"%s (%s@%s) is now an IRC operator of type %s (using oper '%s')",
 363                 nick.c_str(), ident.c_str(), host.c_str(), oper->name.c_str(), opername.c_str());
 364         this->WriteNumeric(RPL_YOUAREOPER, InspIRCd::Format("You are now %s %s", strchr("aeiouAEIOU", oper->name[0]) ? "an" : "a", oper->name.c_str()));
 365
 366         ServerInstance->Logs->Log("OPER", LOG_DEFAULT, "%s opered as type: %s", GetFullRealHost().c_str(), oper->name.c_str());
 367         ServerInstance->Users->all_opers.push_back(this);
 368
 369         // Expand permissions from config for faster lookup
 370         if (IS_LOCAL(this))
 371                 oper->init();
 372
 373         FOREACH_MOD(OnPostOper, (this, oper->name, opername));
 374 }
 375
 376 void OperInfo::init()
 377 {
 378         AllowedOperCommands.clear();
 379         AllowedPrivs.clear();
 380         AllowedUserModes.reset();
 381         AllowedChanModes.reset();
 382         AllowedUserModes['o' - 'A'] = true; // Call me paranoid if you want.
 383
 384         for(std::vector<reference<ConfigTag> >::iterator iter = class_blocks.begin(); iter != class_blocks.end(); ++iter)
 385         {
 386                 ConfigTag* tag = *iter;
 387                 std::string mycmd, mypriv;
 388                 /* Process commands */
 389                 irc::spacesepstream CommandList(tag->getString("commands"));
 390                 while (CommandList.GetToken(mycmd))
 391                 {
 392                         AllowedOperCommands.insert(mycmd);
 393                 }
 394
 395                 irc::spacesepstream PrivList(tag->getString("privs"));
 396                 while (PrivList.GetToken(mypriv))
 397                 {
 398                         AllowedPrivs.insert(mypriv);
 399                 }
 400
 401                 std::string modes = tag->getString("usermodes");
 402                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
 403                 {
 404                         if (*c == '*')
 405                         {
 406                                 this->AllowedUserModes.set();
 407                         }
 408                         else if (*c >= 'A' && *c <= 'z')
 409                         {
 410                                 this->AllowedUserModes[*c - 'A'] = true;
 411                         }
 412                 }
 413
 414                 modes = tag->getString("chanmodes");
 415                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
 416                 {
 417                         if (*c == '*')
 418                         {
 419                                 this->AllowedChanModes.set();
 420                         }
 421                         else if (*c >= 'A' && *c <= 'z')
 422                         {
 423                                 this->AllowedChanModes[*c - 'A'] = true;
 424                         }
 425                 }
 426         }
 427 }
 428
 429 void User::UnOper()
 430 {
 431         if (!this->IsOper())
 432                 return;
 433
 434         /*
 435          * unset their oper type (what IS_OPER checks).
 436          * note, order is important - this must come before modes as -o attempts
 437          * to call UnOper. -- w00t
 438          */
 439         oper = NULL;
 440
 441
 442         /* Remove all oper only modes from the user when the deoper - Bug #466*/
 443         Modes::ChangeList changelist;
 444         const ModeParser::ModeHandlerMap& usermodes = ServerInstance->Modes->GetModes(MODETYPE_USER);
 445         for (ModeParser::ModeHandlerMap::const_iterator i = usermodes.begin(); i != usermodes.end(); ++i)
 446         {
 447                 ModeHandler* mh = i->second;
 448                 if (mh->NeedsOper())
 449                         changelist.push_remove(mh);
 450         }
 451
 452         ServerInstance->Modes->Process(this, NULL, this, changelist);
 453
 454         // Remove the user from the oper list
 455         stdalgo::vector::swaperase(ServerInstance->Users->all_opers, this);
 456
 457         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
 458         this->SetMode(opermh, false);
 459 }
 460
 461 /*
 462  * Check class restrictions
 463  */
 464 void LocalUser::CheckClass(bool clone_count)
 465 {
 466         ConnectClass* a = this->MyClass;
 467
 468         if (!a)
 469         {
 470                 ServerInstance->Users->QuitUser(this, "Access denied by configuration");
 471                 return;
 472         }
 473         else if (a->type == CC_DENY)
 474         {
 475                 ServerInstance->Users->QuitUser(this, a->config->getString("reason", "Unauthorised connection"));
 476                 return;
 477         }
 478         else if (clone_count)
 479         {
 480                 const UserManager::CloneCounts& clonecounts = ServerInstance->Users->GetCloneCounts(this);
 481                 if ((a->GetMaxLocal()) && (clonecounts.local > a->GetMaxLocal()))
 482                 {
 483                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (local)");
 484                         if (a->maxconnwarn)
 485                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum LOCAL connections (%ld) exceeded for IP %s", a->GetMaxLocal(), this->GetIPString().c_str());
 486                         return;
 487                 }
 488                 else if ((a->GetMaxGlobal()) && (clonecounts.global > a->GetMaxGlobal()))
 489                 {
 490                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (global)");
 491                         if (a->maxconnwarn)
 492                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum GLOBAL connections (%ld) exceeded for IP %s", a->GetMaxGlobal(), this->GetIPString().c_str());
 493                         return;
 494                 }
 495         }
 496
 497         this->nping = ServerInstance->Time() + a->GetPingTime() + ServerInstance->Config->dns_timeout;
 498 }
 499
 500 bool LocalUser::CheckLines(bool doZline)
 501 {
 502         const char* check[] = { "G" , "K", (doZline) ? "Z" : NULL, NULL };
 503
 504         if (!this->exempt)
 505         {
 506                 for (int n = 0; check[n]; ++n)
 507                 {
 508                         XLine *r = ServerInstance->XLines->MatchesLine(check[n], this);
 509
 510                         if (r)
 511                         {
 512                                 r->Apply(this);
 513                                 return true;
 514                         }
 515                 }
 516         }
 517
 518         return false;
 519 }
 520
 521 void LocalUser::FullConnect()
 522 {
 523         ServerInstance->stats.Connects++;
 524         this->idle_lastmsg = ServerInstance->Time();
 525
 526         /*
 527          * You may be thinking "wtf, we checked this in User::AddClient!" - and yes, we did, BUT.
 528          * At the time AddClient is called, we don't have a resolved host, by here we probably do - which
 529          * may put the user into a totally seperate class with different restrictions! so we *must* check again.
 530          * Don't remove this! -- w00t
 531          */
 532         MyClass = NULL;
 533         SetClass();
 534         CheckClass();
 535         CheckLines();
 536
 537         if (quitting)
 538                 return;
 539
 540         this->WriteNumeric(RPL_WELCOME, InspIRCd::Format("Welcome to the %s IRC Network %s", ServerInstance->Config->Network.c_str(), GetFullRealHost().c_str()));
 541         this->WriteNumeric(RPL_YOURHOSTIS, InspIRCd::Format("Your host is %s, running version %s", ServerInstance->Config->ServerName.c_str(), INSPIRCD_BRANCH));
 542         this->WriteNumeric(RPL_SERVERCREATED, InspIRCd::Format("This server was created %s %s", __TIME__, __DATE__));
 543
 544         const std::string& modelist = ServerInstance->Modes->GetModeListFor004Numeric();
 545         this->WriteNumeric(RPL_SERVERVERSION, ServerInstance->Config->ServerName, INSPIRCD_BRANCH, modelist);
 546
 547         ServerInstance->ISupport.SendTo(this);
 548
 549         /* Now registered */
 550         if (ServerInstance->Users->unregistered_count)
 551                 ServerInstance->Users->unregistered_count--;
 552
 553         /* Trigger MOTD and LUSERS output, give modules a chance too */
 554         ModResult MOD_RESULT;
 555         std::string command("LUSERS");
 556         std::vector<std::string> parameters;
 557         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, parameters, this, true, command));
 558         if (!MOD_RESULT)
 559                 ServerInstance->Parser.CallHandler(command, parameters, this);
 560
 561         MOD_RESULT = MOD_RES_PASSTHRU;
 562         command = "MOTD";
 563         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, parameters, this, true, command));
 564         if (!MOD_RESULT)
 565                 ServerInstance->Parser.CallHandler(command, parameters, this);
 566
 567         if (ServerInstance->Config->RawLog)
 568                 WriteServ("PRIVMSG %s :*** Raw I/O logging is enabled on this server. All messages, passwords, and commands are being recorded.", nick.c_str());
 569
 570         /*
 571          * We don't set REG_ALL until triggering OnUserConnect, so some module events don't spew out stuff
 572          * for a user that doesn't exist yet.
 573          */
 574         FOREACH_MOD(OnUserConnect, (this));
 575
 576         this->registered = REG_ALL;
 577
 578         FOREACH_MOD(OnPostConnect, (this));
 579
 580         ServerInstance->SNO->WriteToSnoMask('c',"Client connecting on port %d (class %s): %s (%s) [%s]",
 581                 this->GetServerPort(), this->MyClass->name.c_str(), GetFullRealHost().c_str(), this->GetIPString().c_str(), this->fullname.c_str());
 582         ServerInstance->Logs->Log("BANCACHE", LOG_DEBUG, "BanCache: Adding NEGATIVE hit for " + this->GetIPString());
 583         ServerInstance->BanCache.AddHit(this->GetIPString(), "", "");
 584         // reset the flood penalty (which could have been raised due to things like auto +x)
 585         CommandFloodPenalty = 0;
 586 }
 587
 588 void User::InvalidateCache()
 589 {
 590         /* Invalidate cache */
 591         cached_fullhost.clear();
 592         cached_hostip.clear();
 593         cached_makehost.clear();
 594         cached_fullrealhost.clear();
 595 }
 596
 597 bool User::ChangeNick(const std::string& newnick, time_t newts)
 598 {
 599         if (quitting)
 600         {
 601                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "ERROR: Attempted to change nick of a quitting user: " + this->nick);
 602                 return false;
 603         }
 604
 605         User* const InUse = ServerInstance->FindNickOnly(newnick);
 606         if (InUse == this)
 607         {
 608                 // case change, don't need to check campers
 609                 // and, if it's identical including case, we can leave right now
 610                 // We also don't update the nick TS if it's a case change, either
 611                 if (newnick == nick)
 612                         return true;
 613         }
 614         else
 615         {
 616                 /*
 617                  * Uh oh.. if the nickname is in use, and it's not in use by the person using it (doh) --
 618                  * then we have a potential collide. Check whether someone else is camping on the nick
 619                  * (i.e. connect -> send NICK, don't send USER.) If they are camping, force-change the
 620                  * camper to their UID, and allow the incoming nick change.
 621                  *
 622                  * If the guy using the nick is already using it, tell the incoming nick change to gtfo,
 623                  * because the nick is already (rightfully) in use. -- w00t
 624                  */
 625                 if (InUse)
 626                 {
 627                         if (InUse->registered != REG_ALL)
 628                         {
 629                                 /* force the camper to their UUID, and ask them to re-send a NICK. */
 630                                 InUse->WriteFrom(InUse, "NICK %s", InUse->uuid.c_str());
 631                                 InUse->WriteNumeric(ERR_NICKNAMEINUSE, InUse->nick, "Nickname overruled.");
 632
 633                                 InUse->registered &= ~REG_NICK;
 634                                 InUse->ChangeNick(InUse->uuid);
 635                         }
 636                         else
 637                         {
 638                                 /* No camping, tell the incoming user  to stop trying to change nick ;p */
 639                                 this->WriteNumeric(ERR_NICKNAMEINUSE, newnick, "Nickname is already in use.");
 640                                 return false;
 641                         }
 642                 }
 643
 644                 age = newts ? newts : ServerInstance->Time();
 645         }
 646
 647         if (this->registered == REG_ALL)
 648                 this->WriteCommon("NICK %s",newnick.c_str());
 649         std::string oldnick = nick;
 650         nick = newnick;
 651
 652         InvalidateCache();
 653         ServerInstance->Users->clientlist.erase(oldnick);
 654         ServerInstance->Users->clientlist[newnick] = this;
 655
 656         if (registered == REG_ALL)
 657                 FOREACH_MOD(OnUserPostNick, (this,oldnick));
 658
 659         return true;
 660 }
 661
 662 int LocalUser::GetServerPort()
 663 {
 664         switch (this->server_sa.sa.sa_family)
 665         {
 666                 case AF_INET6:
 667                         return htons(this->server_sa.in6.sin6_port);
 668                 case AF_INET:
 669                         return htons(this->server_sa.in4.sin_port);
 670         }
 671         return 0;
 672 }
 673
 674 const std::string& User::GetIPString()
 675 {
 676         int port;
 677         if (cachedip.empty())
 678         {
 679                 irc::sockets::satoap(client_sa, cachedip, port);
 680                 /* IP addresses starting with a : on irc are a Bad Thing (tm) */
 681                 if (cachedip[0] == ':')
 682                         cachedip.insert(cachedip.begin(),1,'0');
 683         }
 684
 685         return cachedip;
 686 }
 687
 688 irc::sockets::cidr_mask User::GetCIDRMask()
 689 {
 690         int range = 0;
 691         switch (client_sa.sa.sa_family)
 692         {
 693                 case AF_INET6:
 694                         range = ServerInstance->Config->c_ipv6_range;
 695                         break;
 696                 case AF_INET:
 697                         range = ServerInstance->Config->c_ipv4_range;
 698                         break;
 699         }
 700         return irc::sockets::cidr_mask(client_sa, range);
 701 }
 702
 703 bool User::SetClientIP(const char* sip, bool recheck_eline)
 704 {
 705         cachedip.clear();
 706         cached_hostip.clear();
 707         return irc::sockets::aptosa(sip, 0, client_sa);
 708 }
 709
 710 void User::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
 711 {
 712         cachedip.clear();
 713         cached_hostip.clear();
 714         memcpy(&client_sa, &sa, sizeof(irc::sockets::sockaddrs));
 715 }
 716
 717 bool LocalUser::SetClientIP(const char* sip, bool recheck_eline)
 718 {
 719         irc::sockets::sockaddrs sa;
 720         if (!irc::sockets::aptosa(sip, 0, sa))
 721                 // Invalid
 722                 return false;
 723
 724         LocalUser::SetClientIP(sa, recheck_eline);
 725         return true;
 726 }
 727
 728 void LocalUser::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
 729 {
 730         if (sa != client_sa)
 731         {
 732                 User::SetClientIP(sa);
 733                 if (recheck_eline)
 734                         this->exempt = (ServerInstance->XLines->MatchesLine("E", this) != NULL);
 735
 736                 FOREACH_MOD(OnSetUserIP, (this));
 737         }
 738 }
 739
 740 static std::string wide_newline("\r\n");
 741
 742 void User::Write(const std::string& text)
 743 {
 744 }
 745
 746 void User::Write(const char *text, ...)
 747 {
 748 }
 749
 750 void LocalUser::Write(const std::string& text)
 751 {
 752         if (!SocketEngine::BoundsCheckFd(&eh))
 753                 return;
 754
 755         if (text.length() > ServerInstance->Config->Limits.MaxLine - 2)
 756         {
 757                 // this should happen rarely or never. Crop the string at 512 and try again.
 758                 std::string try_again(text, 0, ServerInstance->Config->Limits.MaxLine - 2);
 759                 Write(try_again);
 760                 return;
 761         }
 762
 763         ServerInstance->Logs->Log("USEROUTPUT", LOG_RAWIO, "C[%s] O %s", uuid.c_str(), text.c_str());
 764
 765         eh.AddWriteBuf(text);
 766         eh.AddWriteBuf(wide_newline);
 767
 768         ServerInstance->stats.Sent += text.length() + 2;
 769         this->bytes_out += text.length() + 2;
 770         this->cmds_out++;
 771 }
 772
 773 /** Write()
 774  */
 775 void LocalUser::Write(const char *text, ...)
 776 {
 777         std::string textbuffer;
 778         VAFORMAT(textbuffer, text, text);
 779         this->Write(textbuffer);
 780 }
 781
 782 void User::WriteServ(const std::string& text)
 783 {
 784         this->Write(":%s %s",ServerInstance->Config->ServerName.c_str(),text.c_str());
 785 }
 786
 787 /** WriteServ()
 788  *  Same as Write(), except `text' is prefixed with `:server.name '.
 789  */
 790 void User::WriteServ(const char* text, ...)
 791 {
 792         std::string textbuffer;
 793         VAFORMAT(textbuffer, text, text);
 794         this->WriteServ(textbuffer);
 795 }
 796
 797 void User::WriteCommand(const char* command, const std::string& text)
 798 {
 799         this->WriteServ(command + (this->registered & REG_NICK ? " " + this->nick : " *") + " " + text);
 800 }
 801
 802 namespace
 803 {
 804         std::string BuildNumeric(const std::string& source, User* targetuser, unsigned int num, const std::vector<std::string>& params)
 805         {
 806                 const char* const target = (targetuser->registered & REG_NICK ? targetuser->nick.c_str() : "*");
 807                 std::string raw = InspIRCd::Format(":%s %03u %s", source.c_str(), num, target);
 808                 if (!params.empty())
 809                 {
 810                         for (std::vector<std::string>::const_iterator i = params.begin(); i != params.end()-1; ++i)
 811                                 raw.append(1, ' ').append(*i);
 812                         raw.append(" :").append(params.back());
 813                 }
 814                 return raw;
 815         }
 816 }
 817
 818 void User::WriteNumeric(const Numeric::Numeric& numeric)
 819 {
 820         ModResult MOD_RESULT;
 821
 822         FIRST_MOD_RESULT(OnNumeric, MOD_RESULT, (this, numeric));
 823
 824         if (MOD_RESULT == MOD_RES_DENY)
 825                 return;
 826
 827         const std::string& servername = (numeric.GetServer() ? numeric.GetServer()->GetName() : ServerInstance->Config->ServerName);
 828         this->Write(BuildNumeric(servername, this, numeric.GetNumeric(), numeric.GetParams()));
 829 }
 830
 831 void User::WriteFrom(User *user, const std::string &text)
 832 {
 833         const std::string message = ":" + user->GetFullHost() + " " + text;
 834         this->Write(message);
 835 }
 836
 837
 838 /* write text from an originating user to originating user */
 839
 840 void User::WriteFrom(User *user, const char* text, ...)
 841 {
 842         std::string textbuffer;
 843         VAFORMAT(textbuffer, text, text);
 844         this->WriteFrom(user, textbuffer);
 845 }
 846
 847 void User::WriteRemoteNotice(const std::string& text)
 848 {
 849         ServerInstance->PI->SendUserNotice(this, text);
 850 }
 851
 852 void LocalUser::WriteRemoteNotice(const std::string& text)
 853 {
 854         WriteNotice(text);
 855 }
 856
 857 namespace
 858 {
 859         class WriteCommonRawHandler : public User::ForEachNeighborHandler
 860         {
 861                 const std::string& msg;
 862
 863                 void Execute(LocalUser* user) CXX11_OVERRIDE
 864                 {
 865                         user->Write(msg);
 866                 }
 867
 868          public:
 869                 WriteCommonRawHandler(const std::string& message)
 870                         : msg(message)
 871                 {
 872                 }
 873         };
 874 }
 875
 876 void User::WriteCommon(const char* text, ...)
 877 {
 878         std::string textbuffer;
 879         VAFORMAT(textbuffer, text, text);
 880         textbuffer = ":" + this->GetFullHost() + " " + textbuffer;
 881         this->WriteCommonRaw(textbuffer, true);
 882 }
 883
 884 void User::WriteCommonRaw(const std::string &line, bool include_self)
 885 {
 886         WriteCommonRawHandler handler(line);
 887         ForEachNeighbor(handler, include_self);
 888 }
 889
 890 void User::ForEachNeighbor(ForEachNeighborHandler& handler, bool include_self)
 891 {
 892         // The basic logic for visiting the neighbors of a user is to iterate the channel list of the user
 893         // and visit all users on those channels. Because two users may share more than one common channel,
 894         // we must skip users that we have already visited.
 895         // To do this, we make use of a global counter and an integral 'already_sent' field in LocalUser.
 896         // The global counter is incremented every time we do something for each neighbor of a user. Then,
 897         // before visiting a member we examine user->already_sent. If it's equal to the current counter, we
 898         // skip the member. Otherwise, we set it to the current counter and visit the member.
 899
 900         // Ask modules to build a list of exceptions.
 901         // Mods may also exclude entire channels by erasing them from include_chans.
 902         IncludeChanList include_chans(chans.begin(), chans.end());
 903         std::map<User*, bool> exceptions;
 904         exceptions[this] = include_self;
 905         FOREACH_MOD(OnBuildNeighborList, (this, include_chans, exceptions));
 906
 907         // Get next id, guaranteed to differ from the already_sent field of all users
 908         const already_sent_t newid = ServerInstance->Users.NextAlreadySentId();
 909
 910         // Handle exceptions first
 911         for (std::map<User*, bool>::const_iterator i = exceptions.begin(); i != exceptions.end(); ++i)
 912         {
 913                 LocalUser* curr = IS_LOCAL(i->first);
 914                 if (curr)
 915                 {
 916                         // Mark as visited to ensure we won't visit again if there is a common channel
 917                         curr->already_sent = newid;
 918                         // Always treat quitting users as excluded
 919                         if ((i->second) && (!curr->quitting))
 920                                 handler.Execute(curr);
 921                 }
 922         }
 923
 924         // Now consider the real neighbors
 925         for (IncludeChanList::const_iterator i = include_chans.begin(); i != include_chans.end(); ++i)
 926         {
 927                 Channel* chan = (*i)->chan;
 928                 const Channel::MemberMap& userlist = chan->GetUsers();
 929                 for (Channel::MemberMap::const_iterator j = userlist.begin(); j != userlist.end(); ++j)
 930                 {
 931                         LocalUser* curr = IS_LOCAL(j->first);
 932                         // User not yet visited?
 933                         if ((curr) && (curr->already_sent != newid))
 934                         {
 935                                 // Mark as visited and execute function
 936                                 curr->already_sent = newid;
 937                                 handler.Execute(curr);
 938                         }
 939                 }
 940         }
 941 }
 942
 943 void User::WriteRemoteNumeric(const Numeric::Numeric& numeric)
 944 {
 945         WriteNumeric(numeric);
 946 }
 947
 948 /* return 0 or 1 depending if users u and u2 share one or more common channels
 949  * (used by QUIT, NICK etc which arent channel specific notices)
 950  *
 951  * The old algorithm in 1.0 for this was relatively inefficient, iterating over
 952  * the first users channels then the second users channels within the outer loop,
 953  * therefore it was a maximum of x*y iterations (upon returning 0 and checking
 954  * all possible iterations). However this new function instead checks against the
 955  * channel's userlist in the inner loop which is a std::map<User*,User*>
 956  * and saves us time as we already know what pointer value we are after.
 957  * Don't quote me on the maths as i am not a mathematician or computer scientist,
 958  * but i believe this algorithm is now x+(log y) maximum iterations instead.
 959  */
 960 bool User::SharesChannelWith(User *other)
 961 {
 962         /* Outer loop */
 963         for (User::ChanList::iterator i = this->chans.begin(); i != this->chans.end(); ++i)
 964         {
 965                 /* Eliminate the inner loop (which used to be ~equal in size to the outer loop)
 966                  * by replacing it with a map::find which *should* be more efficient
 967                  */
 968                 if ((*i)->chan->HasUser(other))
 969                         return true;
 970         }
 971         return false;
 972 }
 973
 974 bool User::ChangeName(const std::string& gecos)
 975 {
 976         if (!this->fullname.compare(gecos))
 977                 return true;
 978
 979         if (IS_LOCAL(this))
 980         {
 981                 ModResult MOD_RESULT;
 982                 FIRST_MOD_RESULT(OnChangeLocalUserGECOS, MOD_RESULT, (IS_LOCAL(this),gecos));
 983                 if (MOD_RESULT == MOD_RES_DENY)
 984                         return false;
 985                 FOREACH_MOD(OnChangeName, (this,gecos));
 986         }
 987         this->fullname.assign(gecos, 0, ServerInstance->Config->Limits.MaxGecos);
 988
 989         return true;
 990 }
 991
 992 bool User::ChangeDisplayedHost(const std::string& shost)
 993 {
 994         if (dhost == shost)
 995                 return true;
 996
 997         if (IS_LOCAL(this))
 998         {
 999                 ModResult MOD_RESULT;
1000                 FIRST_MOD_RESULT(OnChangeLocalUserHost, MOD_RESULT, (IS_LOCAL(this),shost));
1001                 if (MOD_RESULT == MOD_RES_DENY)
1002                         return false;
1003         }
1004
1005         FOREACH_MOD(OnChangeHost, (this,shost));
1006
1007         this->dhost.assign(shost, 0, ServerInstance->Config->Limits.MaxHost);
1008         this->InvalidateCache();
1009
1010         if (IS_LOCAL(this))
1011                 this->WriteNumeric(RPL_YOURDISPLAYEDHOST, this->dhost, "is now your displayed host");
1012
1013         return true;
1014 }
1015
1016 bool User::ChangeIdent(const std::string& newident)
1017 {
1018         if (this->ident == newident)
1019                 return true;
1020
1021         FOREACH_MOD(OnChangeIdent, (this,newident));
1022
1023         this->ident.assign(newident, 0, ServerInstance->Config->Limits.IdentMax);
1024         this->InvalidateCache();
1025
1026         return true;
1027 }
1028
1029 /*
1030  * Sets a user's connection class.
1031  * If the class name is provided, it will be used. Otherwise, the class will be guessed using host/ip/ident/etc.
1032  * NOTE: If the <ALLOW> or <DENY> tag specifies an ip, and this user resolves,
1033  * then their ip will be taken as 'priority' anyway, so for example,
1034  * <connect allow="127.0.0.1"> will match joe!bloggs@localhost
1035  */
1036 void LocalUser::SetClass(const std::string &explicit_name)
1037 {
1038         ConnectClass *found = NULL;
1039
1040         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Setting connect class for UID %s", this->uuid.c_str());
1041
1042         if (!explicit_name.empty())
1043         {
1044                 for (ServerConfig::ClassVector::const_iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); ++i)
1045                 {
1046                         ConnectClass* c = *i;
1047
1048                         if (explicit_name == c->name)
1049                         {
1050                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Explicitly set to %s", explicit_name.c_str());
1051                                 found = c;
1052                         }
1053                 }
1054         }
1055         else
1056         {
1057                 for (ServerConfig::ClassVector::const_iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); ++i)
1058                 {
1059                         ConnectClass* c = *i;
1060                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Checking %s", c->GetName().c_str());
1061
1062                         ModResult MOD_RESULT;
1063                         FIRST_MOD_RESULT(OnSetConnectClass, MOD_RESULT, (this,c));
1064                         if (MOD_RESULT == MOD_RES_DENY)
1065                                 continue;
1066                         if (MOD_RESULT == MOD_RES_ALLOW)
1067                         {
1068                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Class forced by module to %s", c->GetName().c_str());
1069                                 found = c;
1070                                 break;
1071                         }
1072
1073                         if (c->type == CC_NAMED)
1074                                 continue;
1075
1076                         bool regdone = (registered != REG_NONE);
1077                         if (c->config->getBool("registered", regdone) != regdone)
1078                                 continue;
1079
1080                         /* check if host matches.. */
1081                         if (!InspIRCd::MatchCIDR(this->GetIPString(), c->GetHost(), NULL) &&
1082                             !InspIRCd::MatchCIDR(this->host, c->GetHost(), NULL))
1083                         {
1084                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "No host match (for %s)", c->GetHost().c_str());
1085                                 continue;
1086                         }
1087
1088                         /*
1089                          * deny change if change will take class over the limit check it HERE, not after we found a matching class,
1090                          * because we should attempt to find another class if this one doesn't match us. -- w00t
1091                          */
1092                         if (c->limit && (c->GetReferenceCount() >= c->limit))
1093                         {
1094                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "OOPS: Connect class limit (%lu) hit, denying", c->limit);
1095                                 continue;
1096                         }
1097
1098                         /* if it requires a port ... */
1099                         int port = c->config->getInt("port");
1100                         if (port)
1101                         {
1102                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Requires port (%d)", port);
1103
1104                                 /* and our port doesn't match, fail. */
1105                                 if (this->GetServerPort() != port)
1106                                         continue;
1107                         }
1108
1109                         if (regdone && !c->config->getString("password").empty())
1110                         {
1111                                 if (!ServerInstance->PassCompare(this, c->config->getString("password"), password, c->config->getString("hash")))
1112                                 {
1113                                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Bad password, skipping");
1114                                         continue;
1115                                 }
1116                         }
1117
1118                         /* we stop at the first class that meets ALL critera. */
1119                         found = c;
1120                         break;
1121                 }
1122         }
1123
1124         /*
1125          * Okay, assuming we found a class that matches.. switch us into that class, keeping refcounts up to date.
1126          */
1127         if (found)
1128         {
1129                 MyClass = found;
1130         }
1131 }
1132
1133 void User::PurgeEmptyChannels()
1134 {
1135         // firstly decrement the count on each channel
1136         for (User::ChanList::iterator i = this->chans.begin(); i != this->chans.end(); )
1137         {
1138                 Channel* c = (*i)->chan;
1139                 ++i;
1140                 c->DelUser(this);
1141         }
1142
1143         this->UnOper();
1144 }
1145
1146 const std::string& FakeUser::GetFullHost()
1147 {
1148         if (!ServerInstance->Config->HideWhoisServer.empty())
1149                 return ServerInstance->Config->HideWhoisServer;
1150         return server->GetName();
1151 }
1152
1153 const std::string& FakeUser::GetFullRealHost()
1154 {
1155         if (!ServerInstance->Config->HideWhoisServer.empty())
1156                 return ServerInstance->Config->HideWhoisServer;
1157         return server->GetName();
1158 }
1159
1160 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask)
1161         : config(tag), type(t), fakelag(true), name("unnamed"), registration_timeout(0), host(mask),
1162         pingtime(0), softsendqmax(0), hardsendqmax(0), recvqmax(0),
1163         penaltythreshold(0), commandrate(0), maxlocal(0), maxglobal(0), maxconnwarn(true), maxchans(ServerInstance->Config->MaxChans),
1164         limit(0), resolvehostnames(true)
1165 {
1166 }
1167
1168 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask, const ConnectClass& parent)
1169         : config(tag), type(t), fakelag(parent.fakelag), name("unnamed"),
1170         registration_timeout(parent.registration_timeout), host(mask), pingtime(parent.pingtime),
1171         softsendqmax(parent.softsendqmax), hardsendqmax(parent.hardsendqmax), recvqmax(parent.recvqmax),
1172         penaltythreshold(parent.penaltythreshold), commandrate(parent.commandrate),
1173         maxlocal(parent.maxlocal), maxglobal(parent.maxglobal), maxconnwarn(parent.maxconnwarn), maxchans(parent.maxchans),
1174         limit(parent.limit), resolvehostnames(parent.resolvehostnames)
1175 {
1176 }
1177
1178 void ConnectClass::Update(const ConnectClass* src)
1179 {
1180         config = src->config;
1181         type = src->type;
1182         fakelag = src->fakelag;
1183         name = src->name;
1184         registration_timeout = src->registration_timeout;
1185         host = src->host;
1186         pingtime = src->pingtime;
1187         softsendqmax = src->softsendqmax;
1188         hardsendqmax = src->hardsendqmax;
1189         recvqmax = src->recvqmax;
1190         penaltythreshold = src->penaltythreshold;
1191         commandrate = src->commandrate;
1192         maxlocal = src->maxlocal;
1193         maxglobal = src->maxglobal;
1194         maxconnwarn = src->maxconnwarn;
1195         maxchans = src->maxchans;
1196         limit = src->limit;
1197         resolvehostnames = src->resolvehostnames;
1198 }