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 already_sent_t LocalUser::already_sent_id = 0;
  30
  31 bool User::IsNoticeMaskSet(unsigned char sm)
  32 {
  33         if (!isalpha(sm))
  34                 return false;
  35         return (snomasks[sm-65]);
  36 }
  37
  38 bool User::IsModeSet(unsigned char m)
  39 {
  40         ModeHandler* mh = ServerInstance->Modes->FindMode(m, MODETYPE_USER);
  41         return (mh && modes[mh->GetId()]);
  42 }
  43
  44 const char* User::FormatModes(bool showparameters)
  45 {
  46         static std::string data;
  47         std::string params;
  48         data.clear();
  49
  50         for (unsigned char n = 0; n < 64; n++)
  51         {
  52                 ModeHandler* mh = ServerInstance->Modes->FindMode(n + 65, MODETYPE_USER);
  53                 if (mh && IsModeSet(mh))
  54                 {
  55                         data.push_back(n + 65);
  56                         if (showparameters && mh->GetNumParams(true))
  57                         {
  58                                 std::string p = mh->GetUserParameter(this);
  59                                 if (p.length())
  60                                         params.append(" ").append(p);
  61                         }
  62                 }
  63         }
  64         data += params;
  65         return data.c_str();
  66 }
  67
  68 User::User(const std::string& uid, Server* srv, int type)
  69         : uuid(uid), server(srv), usertype(type)
  70 {
  71         age = ServerInstance->Time();
  72         signon = 0;
  73         registered = 0;
  74         quitting = false;
  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         if (!ServerInstance->Users->uuidlist.insert(std::make_pair(uuid, this)).second)
  80                 throw CoreException("Duplicate UUID "+std::string(uuid)+" in User constructor");
  81 }
  82
  83 LocalUser::LocalUser(int myfd, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* servaddr)
  84         : User(ServerInstance->UIDGen.GetUID(), ServerInstance->FakeClient->server, USERTYPE_LOCAL), eh(this),
  85         bytes_in(0), bytes_out(0), cmds_in(0), cmds_out(0), nping(0), CommandFloodPenalty(0),
  86         already_sent(0)
  87 {
  88         exempt = quitting_sendq = false;
  89         idle_lastmsg = 0;
  90         ident = "unknown";
  91         lastping = 0;
  92         eh.SetFd(myfd);
  93         memcpy(&client_sa, client, sizeof(irc::sockets::sockaddrs));
  94         memcpy(&server_sa, servaddr, sizeof(irc::sockets::sockaddrs));
  95         dhost = host = GetIPString();
  96 }
  97
  98 User::~User()
  99 {
 100 }
 101
 102 const std::string& User::MakeHost()
 103 {
 104         if (!this->cached_makehost.empty())
 105                 return this->cached_makehost;
 106
 107         // XXX: Is there really a need to cache this?
 108         this->cached_makehost = ident + "@" + host;
 109         return this->cached_makehost;
 110 }
 111
 112 const std::string& User::MakeHostIP()
 113 {
 114         if (!this->cached_hostip.empty())
 115                 return this->cached_hostip;
 116
 117         // XXX: Is there really a need to cache this?
 118         this->cached_hostip = ident + "@" + this->GetIPString();
 119         return this->cached_hostip;
 120 }
 121
 122 const std::string& User::GetFullHost()
 123 {
 124         if (!this->cached_fullhost.empty())
 125                 return this->cached_fullhost;
 126
 127         // XXX: Is there really a need to cache this?
 128         this->cached_fullhost = nick + "!" + ident + "@" + dhost;
 129         return this->cached_fullhost;
 130 }
 131
 132 const std::string& User::GetFullRealHost()
 133 {
 134         if (!this->cached_fullrealhost.empty())
 135                 return this->cached_fullrealhost;
 136
 137         // XXX: Is there really a need to cache this?
 138         this->cached_fullrealhost = nick + "!" + ident + "@" + host;
 139         return this->cached_fullrealhost;
 140 }
 141
 142 InviteList& LocalUser::GetInviteList()
 143 {
 144         RemoveExpiredInvites();
 145         return invites;
 146 }
 147
 148 bool LocalUser::RemoveInvite(Channel* chan)
 149 {
 150         Invitation* inv = Invitation::Find(chan, this);
 151         if (inv)
 152         {
 153                 delete inv;
 154                 return true;
 155         }
 156         return false;
 157 }
 158
 159 void LocalUser::RemoveExpiredInvites()
 160 {
 161         Invitation::Find(NULL, this);
 162 }
 163
 164 bool User::HasModePermission(unsigned char, ModeType)
 165 {
 166         return true;
 167 }
 168
 169 bool LocalUser::HasModePermission(unsigned char mode, ModeType type)
 170 {
 171         if (!this->IsOper())
 172                 return false;
 173
 174         if (mode < 'A' || mode > ('A' + 64)) return false;
 175
 176         return ((type == MODETYPE_USER ? oper->AllowedUserModes : oper->AllowedChanModes))[(mode - 'A')];
 177
 178 }
 179 /*
 180  * users on remote servers can completely bypass all permissions based checks.
 181  * This prevents desyncs when one server has different type/class tags to another.
 182  * That having been said, this does open things up to the possibility of source changes
 183  * allowing remote kills, etc - but if they have access to the src, they most likely have
 184  * access to the conf - so it's an end to a means either way.
 185  */
 186 bool User::HasPermission(const std::string&)
 187 {
 188         return true;
 189 }
 190
 191 bool LocalUser::HasPermission(const std::string &command)
 192 {
 193         // are they even an oper at all?
 194         if (!this->IsOper())
 195         {
 196                 return false;
 197         }
 198
 199         if (oper->AllowedOperCommands.find(command) != oper->AllowedOperCommands.end())
 200                 return true;
 201         else if (oper->AllowedOperCommands.find("*") != oper->AllowedOperCommands.end())
 202                 return true;
 203
 204         return false;
 205 }
 206
 207 bool User::HasPrivPermission(const std::string &privstr, bool noisy)
 208 {
 209         return true;
 210 }
 211
 212 bool LocalUser::HasPrivPermission(const std::string &privstr, bool noisy)
 213 {
 214         if (!this->IsOper())
 215         {
 216                 if (noisy)
 217                         this->WriteNotice("You are not an oper");
 218                 return false;
 219         }
 220
 221         if (oper->AllowedPrivs.find(privstr) != oper->AllowedPrivs.end())
 222         {
 223                 return true;
 224         }
 225         else if (oper->AllowedPrivs.find("*") != oper->AllowedPrivs.end())
 226         {
 227                 return true;
 228         }
 229
 230         if (noisy)
 231                 this->WriteNotice("Oper type " + oper->name + " does not have access to priv " + privstr);
 232
 233         return false;
 234 }
 235
 236 void UserIOHandler::OnDataReady()
 237 {
 238         if (user->quitting)
 239                 return;
 240
 241         if (recvq.length() > user->MyClass->GetRecvqMax() && !user->HasPrivPermission("users/flood/increased-buffers"))
 242         {
 243                 ServerInstance->Users->QuitUser(user, "RecvQ exceeded");
 244                 ServerInstance->SNO->WriteToSnoMask('a', "User %s RecvQ of %lu exceeds connect class maximum of %lu",
 245                         user->nick.c_str(), (unsigned long)recvq.length(), user->MyClass->GetRecvqMax());
 246                 return;
 247         }
 248         unsigned long sendqmax = ULONG_MAX;
 249         if (!user->HasPrivPermission("users/flood/increased-buffers"))
 250                 sendqmax = user->MyClass->GetSendqSoftMax();
 251         unsigned long penaltymax = ULONG_MAX;
 252         if (!user->HasPrivPermission("users/flood/no-fakelag"))
 253                 penaltymax = user->MyClass->GetPenaltyThreshold() * 1000;
 254
 255         while (user->CommandFloodPenalty < penaltymax && getSendQSize() < sendqmax)
 256         {
 257                 std::string line;
 258                 line.reserve(ServerInstance->Config->Limits.MaxLine);
 259                 std::string::size_type qpos = 0;
 260                 while (qpos < recvq.length())
 261                 {
 262                         char c = recvq[qpos++];
 263                         switch (c)
 264                         {
 265                         case '\0':
 266                                 c = ' ';
 267                                 break;
 268                         case '\r':
 269                                 continue;
 270                         case '\n':
 271                                 goto eol_found;
 272                         }
 273                         if (line.length() < ServerInstance->Config->Limits.MaxLine - 2)
 274                                 line.push_back(c);
 275                 }
 276                 // if we got here, the recvq ran out before we found a newline
 277                 return;
 278 eol_found:
 279                 // just found a newline. Terminate the string, and pull it out of recvq
 280                 recvq = recvq.substr(qpos);
 281
 282                 // TODO should this be moved to when it was inserted in recvq?
 283                 ServerInstance->stats.Recv += qpos;
 284                 user->bytes_in += qpos;
 285                 user->cmds_in++;
 286
 287                 ServerInstance->Parser.ProcessBuffer(line, user);
 288                 if (user->quitting)
 289                         return;
 290         }
 291         if (user->CommandFloodPenalty >= penaltymax && !user->MyClass->fakelag)
 292                 ServerInstance->Users->QuitUser(user, "Excess Flood");
 293 }
 294
 295 void UserIOHandler::AddWriteBuf(const std::string &data)
 296 {
 297         if (user->quitting_sendq)
 298                 return;
 299         if (!user->quitting && getSendQSize() + data.length() > user->MyClass->GetSendqHardMax() &&
 300                 !user->HasPrivPermission("users/flood/increased-buffers"))
 301         {
 302                 user->quitting_sendq = true;
 303                 ServerInstance->GlobalCulls.AddSQItem(user);
 304                 return;
 305         }
 306
 307         // We still want to append data to the sendq of a quitting user,
 308         // e.g. their ERROR message that says 'closing link'
 309
 310         WriteData(data);
 311 }
 312
 313 void UserIOHandler::OnError(BufferedSocketError)
 314 {
 315         ServerInstance->Users->QuitUser(user, getError());
 316 }
 317
 318 CullResult User::cull()
 319 {
 320         if (!quitting)
 321                 ServerInstance->Users->QuitUser(this, "Culled without QuitUser");
 322
 323         if (client_sa.sa.sa_family != AF_UNSPEC)
 324                 ServerInstance->Users->RemoveCloneCounts(this);
 325
 326         return Extensible::cull();
 327 }
 328
 329 CullResult LocalUser::cull()
 330 {
 331         ClearInvites();
 332         eh.cull();
 333         return User::cull();
 334 }
 335
 336 CullResult FakeUser::cull()
 337 {
 338         // Fake users don't quit, they just get culled.
 339         quitting = true;
 340         // Fake users are not inserted into UserManager::clientlist, they're only in the uuidlist
 341         // and they are removed from there by the linking mod when the server splits
 342         return User::cull();
 343 }
 344
 345 void User::Oper(OperInfo* info)
 346 {
 347         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
 348         if (this->IsModeSet(opermh))
 349                 this->UnOper();
 350
 351         this->SetMode(opermh, true);
 352         this->oper = info;
 353         this->WriteCommand("MODE", "+o");
 354         FOREACH_MOD(OnOper, (this, info->name));
 355
 356         std::string opername;
 357         if (info->oper_block)
 358                 opername = info->oper_block->getString("name");
 359
 360         if (IS_LOCAL(this))
 361         {
 362                 LocalUser* l = IS_LOCAL(this);
 363                 std::string vhost = oper->getConfig("vhost");
 364                 if (!vhost.empty())
 365                         l->ChangeDisplayedHost(vhost.c_str());
 366                 std::string opClass = oper->getConfig("class");
 367                 if (!opClass.empty())
 368                         l->SetClass(opClass);
 369         }
 370
 371         ServerInstance->SNO->WriteToSnoMask('o',"%s (%s@%s) is now an IRC operator of type %s (using oper '%s')",
 372                 nick.c_str(), ident.c_str(), host.c_str(), oper->name.c_str(), opername.c_str());
 373         this->WriteNumeric(RPL_YOUAREOPER, ":You are now %s %s", strchr("aeiouAEIOU", oper->name[0]) ? "an" : "a", oper->name.c_str());
 374
 375         ServerInstance->Logs->Log("OPER", LOG_DEFAULT, "%s opered as type: %s", GetFullRealHost().c_str(), oper->name.c_str());
 376         ServerInstance->Users->all_opers.push_back(this);
 377
 378         // Expand permissions from config for faster lookup
 379         if (IS_LOCAL(this))
 380                 oper->init();
 381
 382         FOREACH_MOD(OnPostOper, (this, oper->name, opername));
 383 }
 384
 385 void OperInfo::init()
 386 {
 387         AllowedOperCommands.clear();
 388         AllowedPrivs.clear();
 389         AllowedUserModes.reset();
 390         AllowedChanModes.reset();
 391         AllowedUserModes['o' - 'A'] = true; // Call me paranoid if you want.
 392
 393         for(std::vector<reference<ConfigTag> >::iterator iter = class_blocks.begin(); iter != class_blocks.end(); ++iter)
 394         {
 395                 ConfigTag* tag = *iter;
 396                 std::string mycmd, mypriv;
 397                 /* Process commands */
 398                 irc::spacesepstream CommandList(tag->getString("commands"));
 399                 while (CommandList.GetToken(mycmd))
 400                 {
 401                         AllowedOperCommands.insert(mycmd);
 402                 }
 403
 404                 irc::spacesepstream PrivList(tag->getString("privs"));
 405                 while (PrivList.GetToken(mypriv))
 406                 {
 407                         AllowedPrivs.insert(mypriv);
 408                 }
 409
 410                 std::string modes = tag->getString("usermodes");
 411                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
 412                 {
 413                         if (*c == '*')
 414                         {
 415                                 this->AllowedUserModes.set();
 416                         }
 417                         else if (*c >= 'A' && *c <= 'z')
 418                         {
 419                                 this->AllowedUserModes[*c - 'A'] = true;
 420                         }
 421                 }
 422
 423                 modes = tag->getString("chanmodes");
 424                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
 425                 {
 426                         if (*c == '*')
 427                         {
 428                                 this->AllowedChanModes.set();
 429                         }
 430                         else if (*c >= 'A' && *c <= 'z')
 431                         {
 432                                 this->AllowedChanModes[*c - 'A'] = true;
 433                         }
 434                 }
 435         }
 436 }
 437
 438 void User::UnOper()
 439 {
 440         if (!this->IsOper())
 441                 return;
 442
 443         /*
 444          * unset their oper type (what IS_OPER checks).
 445          * note, order is important - this must come before modes as -o attempts
 446          * to call UnOper. -- w00t
 447          */
 448         oper = NULL;
 449
 450
 451         /* Remove all oper only modes from the user when the deoper - Bug #466*/
 452         std::string moderemove("-");
 453
 454         for (unsigned char letter = 'A'; letter <= 'z'; letter++)
 455         {
 456                 ModeHandler* mh = ServerInstance->Modes->FindMode(letter, MODETYPE_USER);
 457                 if (mh && mh->NeedsOper())
 458                         moderemove += letter;
 459         }
 460
 461
 462         std::vector<std::string> parameters;
 463         parameters.push_back(this->nick);
 464         parameters.push_back(moderemove);
 465
 466         ServerInstance->Modes->Process(parameters, this);
 467
 468         // Remove the user from the oper list
 469         stdalgo::vector::swaperase(ServerInstance->Users->all_opers, this);
 470
 471         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
 472         this->SetMode(opermh, false);
 473 }
 474
 475 /*
 476  * Check class restrictions
 477  */
 478 void LocalUser::CheckClass(bool clone_count)
 479 {
 480         ConnectClass* a = this->MyClass;
 481
 482         if (!a)
 483         {
 484                 ServerInstance->Users->QuitUser(this, "Access denied by configuration");
 485                 return;
 486         }
 487         else if (a->type == CC_DENY)
 488         {
 489                 ServerInstance->Users->QuitUser(this, a->config->getString("reason", "Unauthorised connection"));
 490                 return;
 491         }
 492         else if (clone_count)
 493         {
 494                 const UserManager::CloneCounts& clonecounts = ServerInstance->Users->GetCloneCounts(this);
 495                 if ((a->GetMaxLocal()) && (clonecounts.local > a->GetMaxLocal()))
 496                 {
 497                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (local)");
 498                         if (a->maxconnwarn)
 499                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum LOCAL connections (%ld) exceeded for IP %s", a->GetMaxLocal(), this->GetIPString().c_str());
 500                         return;
 501                 }
 502                 else if ((a->GetMaxGlobal()) && (clonecounts.global > a->GetMaxGlobal()))
 503                 {
 504                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (global)");
 505                         if (a->maxconnwarn)
 506                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum GLOBAL connections (%ld) exceeded for IP %s", a->GetMaxGlobal(), this->GetIPString().c_str());
 507                         return;
 508                 }
 509         }
 510
 511         this->nping = ServerInstance->Time() + a->GetPingTime() + ServerInstance->Config->dns_timeout;
 512 }
 513
 514 bool LocalUser::CheckLines(bool doZline)
 515 {
 516         const char* check[] = { "G" , "K", (doZline) ? "Z" : NULL, NULL };
 517
 518         if (!this->exempt)
 519         {
 520                 for (int n = 0; check[n]; ++n)
 521                 {
 522                         XLine *r = ServerInstance->XLines->MatchesLine(check[n], this);
 523
 524                         if (r)
 525                         {
 526                                 r->Apply(this);
 527                                 return true;
 528                         }
 529                 }
 530         }
 531
 532         return false;
 533 }
 534
 535 void LocalUser::FullConnect()
 536 {
 537         ServerInstance->stats.Connects++;
 538         this->idle_lastmsg = ServerInstance->Time();
 539
 540         /*
 541          * You may be thinking "wtf, we checked this in User::AddClient!" - and yes, we did, BUT.
 542          * At the time AddClient is called, we don't have a resolved host, by here we probably do - which
 543          * may put the user into a totally seperate class with different restrictions! so we *must* check again.
 544          * Don't remove this! -- w00t
 545          */
 546         MyClass = NULL;
 547         SetClass();
 548         CheckClass();
 549         CheckLines();
 550
 551         if (quitting)
 552                 return;
 553
 554         this->WriteNumeric(RPL_WELCOME, ":Welcome to the %s IRC Network %s", ServerInstance->Config->Network.c_str(), GetFullRealHost().c_str());
 555         this->WriteNumeric(RPL_YOURHOSTIS, ":Your host is %s, running version %s", ServerInstance->Config->ServerName.c_str(), INSPIRCD_BRANCH);
 556         this->WriteNumeric(RPL_SERVERCREATED, ":This server was created %s %s", __TIME__, __DATE__);
 557
 558         const std::string& modelist = ServerInstance->Modes->GetModeListFor004Numeric();
 559         this->WriteNumeric(RPL_SERVERVERSION, "%s %s %s", ServerInstance->Config->ServerName.c_str(), INSPIRCD_BRANCH, modelist.c_str());
 560
 561         ServerInstance->ISupport.SendTo(this);
 562
 563         /* Now registered */
 564         if (ServerInstance->Users->unregistered_count)
 565                 ServerInstance->Users->unregistered_count--;
 566
 567         /* Trigger MOTD and LUSERS output, give modules a chance too */
 568         ModResult MOD_RESULT;
 569         std::string command("LUSERS");
 570         std::vector<std::string> parameters;
 571         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, parameters, this, true, command));
 572         if (!MOD_RESULT)
 573                 ServerInstance->Parser.CallHandler(command, parameters, this);
 574
 575         MOD_RESULT = MOD_RES_PASSTHRU;
 576         command = "MOTD";
 577         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, parameters, this, true, command));
 578         if (!MOD_RESULT)
 579                 ServerInstance->Parser.CallHandler(command, parameters, this);
 580
 581         if (ServerInstance->Config->RawLog)
 582                 WriteServ("PRIVMSG %s :*** Raw I/O logging is enabled on this server. All messages, passwords, and commands are being recorded.", nick.c_str());
 583
 584         /*
 585          * We don't set REG_ALL until triggering OnUserConnect, so some module events don't spew out stuff
 586          * for a user that doesn't exist yet.
 587          */
 588         FOREACH_MOD(OnUserConnect, (this));
 589
 590         this->registered = REG_ALL;
 591
 592         FOREACH_MOD(OnPostConnect, (this));
 593
 594         ServerInstance->SNO->WriteToSnoMask('c',"Client connecting on port %d (class %s): %s (%s) [%s]",
 595                 this->GetServerPort(), this->MyClass->name.c_str(), GetFullRealHost().c_str(), this->GetIPString().c_str(), this->fullname.c_str());
 596         ServerInstance->Logs->Log("BANCACHE", LOG_DEBUG, "BanCache: Adding NEGATIVE hit for " + this->GetIPString());
 597         ServerInstance->BanCache.AddHit(this->GetIPString(), "", "");
 598         // reset the flood penalty (which could have been raised due to things like auto +x)
 599         CommandFloodPenalty = 0;
 600 }
 601
 602 void User::InvalidateCache()
 603 {
 604         /* Invalidate cache */
 605         cached_fullhost.clear();
 606         cached_hostip.clear();
 607         cached_makehost.clear();
 608         cached_fullrealhost.clear();
 609 }
 610
 611 bool User::ChangeNick(const std::string& newnick, time_t newts)
 612 {
 613         if (quitting)
 614         {
 615                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "ERROR: Attempted to change nick of a quitting user: " + this->nick);
 616                 return false;
 617         }
 618
 619         User* const InUse = ServerInstance->FindNickOnly(newnick);
 620         if (InUse == this)
 621         {
 622                 // case change, don't need to check campers
 623                 // and, if it's identical including case, we can leave right now
 624                 // We also don't update the nick TS if it's a case change, either
 625                 if (newnick == nick)
 626                         return true;
 627         }
 628         else
 629         {
 630                 /*
 631                  * Uh oh.. if the nickname is in use, and it's not in use by the person using it (doh) --
 632                  * then we have a potential collide. Check whether someone else is camping on the nick
 633                  * (i.e. connect -> send NICK, don't send USER.) If they are camping, force-change the
 634                  * camper to their UID, and allow the incoming nick change.
 635                  *
 636                  * If the guy using the nick is already using it, tell the incoming nick change to gtfo,
 637                  * because the nick is already (rightfully) in use. -- w00t
 638                  */
 639                 if (InUse)
 640                 {
 641                         if (InUse->registered != REG_ALL)
 642                         {
 643                                 /* force the camper to their UUID, and ask them to re-send a NICK. */
 644                                 InUse->WriteFrom(InUse, "NICK %s", InUse->uuid.c_str());
 645                                 InUse->WriteNumeric(ERR_NICKNAMEINUSE, "%s :Nickname overruled.", InUse->nick.c_str());
 646
 647                                 InUse->registered &= ~REG_NICK;
 648                                 InUse->ChangeNick(InUse->uuid);
 649                         }
 650                         else
 651                         {
 652                                 /* No camping, tell the incoming user  to stop trying to change nick ;p */
 653                                 this->WriteNumeric(ERR_NICKNAMEINUSE, "%s :Nickname is already in use.", newnick.c_str());
 654                                 return false;
 655                         }
 656                 }
 657
 658                 age = newts ? newts : ServerInstance->Time();
 659         }
 660
 661         if (this->registered == REG_ALL)
 662                 this->WriteCommon("NICK %s",newnick.c_str());
 663         std::string oldnick = nick;
 664         nick = newnick;
 665
 666         InvalidateCache();
 667         ServerInstance->Users->clientlist.erase(oldnick);
 668         ServerInstance->Users->clientlist[newnick] = this;
 669
 670         if (registered == REG_ALL)
 671                 FOREACH_MOD(OnUserPostNick, (this,oldnick));
 672
 673         return true;
 674 }
 675
 676 int LocalUser::GetServerPort()
 677 {
 678         switch (this->server_sa.sa.sa_family)
 679         {
 680                 case AF_INET6:
 681                         return htons(this->server_sa.in6.sin6_port);
 682                 case AF_INET:
 683                         return htons(this->server_sa.in4.sin_port);
 684         }
 685         return 0;
 686 }
 687
 688 const std::string& User::GetIPString()
 689 {
 690         int port;
 691         if (cachedip.empty())
 692         {
 693                 irc::sockets::satoap(client_sa, cachedip, port);
 694                 /* IP addresses starting with a : on irc are a Bad Thing (tm) */
 695                 if (cachedip[0] == ':')
 696                         cachedip.insert(cachedip.begin(),1,'0');
 697         }
 698
 699         return cachedip;
 700 }
 701
 702 irc::sockets::cidr_mask User::GetCIDRMask()
 703 {
 704         int range = 0;
 705         switch (client_sa.sa.sa_family)
 706         {
 707                 case AF_INET6:
 708                         range = ServerInstance->Config->c_ipv6_range;
 709                         break;
 710                 case AF_INET:
 711                         range = ServerInstance->Config->c_ipv4_range;
 712                         break;
 713         }
 714         return irc::sockets::cidr_mask(client_sa, range);
 715 }
 716
 717 bool User::SetClientIP(const char* sip, bool recheck_eline)
 718 {
 719         cachedip.clear();
 720         cached_hostip.clear();
 721         return irc::sockets::aptosa(sip, 0, client_sa);
 722 }
 723
 724 void User::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
 725 {
 726         cachedip.clear();
 727         cached_hostip.clear();
 728         memcpy(&client_sa, &sa, sizeof(irc::sockets::sockaddrs));
 729 }
 730
 731 bool LocalUser::SetClientIP(const char* sip, bool recheck_eline)
 732 {
 733         irc::sockets::sockaddrs sa;
 734         if (!irc::sockets::aptosa(sip, 0, sa))
 735                 // Invalid
 736                 return false;
 737
 738         LocalUser::SetClientIP(sa, recheck_eline);
 739         return true;
 740 }
 741
 742 void LocalUser::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
 743 {
 744         if (sa != client_sa)
 745         {
 746                 User::SetClientIP(sa);
 747                 if (recheck_eline)
 748                         this->exempt = (ServerInstance->XLines->MatchesLine("E", this) != NULL);
 749
 750                 FOREACH_MOD(OnSetUserIP, (this));
 751         }
 752 }
 753
 754 static std::string wide_newline("\r\n");
 755
 756 void User::Write(const std::string& text)
 757 {
 758 }
 759
 760 void User::Write(const char *text, ...)
 761 {
 762 }
 763
 764 void LocalUser::Write(const std::string& text)
 765 {
 766         if (!SocketEngine::BoundsCheckFd(&eh))
 767                 return;
 768
 769         if (text.length() > ServerInstance->Config->Limits.MaxLine - 2)
 770         {
 771                 // this should happen rarely or never. Crop the string at 512 and try again.
 772                 std::string try_again = text.substr(0, ServerInstance->Config->Limits.MaxLine - 2);
 773                 Write(try_again);
 774                 return;
 775         }
 776
 777         ServerInstance->Logs->Log("USEROUTPUT", LOG_RAWIO, "C[%s] O %s", uuid.c_str(), text.c_str());
 778
 779         eh.AddWriteBuf(text);
 780         eh.AddWriteBuf(wide_newline);
 781
 782         ServerInstance->stats.Sent += text.length() + 2;
 783         this->bytes_out += text.length() + 2;
 784         this->cmds_out++;
 785 }
 786
 787 /** Write()
 788  */
 789 void LocalUser::Write(const char *text, ...)
 790 {
 791         std::string textbuffer;
 792         VAFORMAT(textbuffer, text, text);
 793         this->Write(textbuffer);
 794 }
 795
 796 void User::WriteServ(const std::string& text)
 797 {
 798         this->Write(":%s %s",ServerInstance->Config->ServerName.c_str(),text.c_str());
 799 }
 800
 801 /** WriteServ()
 802  *  Same as Write(), except `text' is prefixed with `:server.name '.
 803  */
 804 void User::WriteServ(const char* text, ...)
 805 {
 806         std::string textbuffer;
 807         VAFORMAT(textbuffer, text, text);
 808         this->WriteServ(textbuffer);
 809 }
 810
 811 void User::WriteCommand(const char* command, const std::string& text)
 812 {
 813         this->WriteServ(command + (this->registered & REG_NICK ? " " + this->nick : " *") + " " + text);
 814 }
 815
 816 void User::WriteNumeric(unsigned int numeric, const char* text, ...)
 817 {
 818         std::string textbuffer;
 819         VAFORMAT(textbuffer, text, text);
 820         this->WriteNumeric(numeric, textbuffer);
 821 }
 822
 823 void User::WriteNumeric(unsigned int numeric, const std::string &text)
 824 {
 825         ModResult MOD_RESULT;
 826
 827         FIRST_MOD_RESULT(OnNumeric, MOD_RESULT, (this, numeric, text));
 828
 829         if (MOD_RESULT == MOD_RES_DENY)
 830                 return;
 831
 832         const std::string message = InspIRCd::Format(":%s %03u %s %s", ServerInstance->Config->ServerName.c_str(),
 833                 numeric, this->registered & REG_NICK ? this->nick.c_str() : "*", text.c_str());
 834         this->Write(message);
 835 }
 836
 837 void User::WriteFrom(User *user, const std::string &text)
 838 {
 839         const std::string message = ":" + user->GetFullHost() + " " + text;
 840         this->Write(message);
 841 }
 842
 843
 844 /* write text from an originating user to originating user */
 845
 846 void User::WriteFrom(User *user, const char* text, ...)
 847 {
 848         std::string textbuffer;
 849         VAFORMAT(textbuffer, text, text);
 850         this->WriteFrom(user, textbuffer);
 851 }
 852
 853 void User::WriteCommon(const char* text, ...)
 854 {
 855         if (this->registered != REG_ALL || quitting)
 856                 return;
 857
 858         std::string textbuffer;
 859         VAFORMAT(textbuffer, text, text);
 860         textbuffer = ":" + this->GetFullHost() + " " + textbuffer;
 861         this->WriteCommonRaw(textbuffer, true);
 862 }
 863
 864 void User::WriteCommonRaw(const std::string &line, bool include_self)
 865 {
 866         if (this->registered != REG_ALL || quitting)
 867                 return;
 868
 869         LocalUser::already_sent_id++;
 870
 871         IncludeChanList include_c(chans.begin(), chans.end());
 872         std::map<User*,bool> exceptions;
 873
 874         exceptions[this] = include_self;
 875
 876         FOREACH_MOD(OnBuildNeighborList, (this, include_c, exceptions));
 877
 878         for (std::map<User*,bool>::iterator i = exceptions.begin(); i != exceptions.end(); ++i)
 879         {
 880                 LocalUser* u = IS_LOCAL(i->first);
 881                 if (u && !u->quitting)
 882                 {
 883                         u->already_sent = LocalUser::already_sent_id;
 884                         if (i->second)
 885                                 u->Write(line);
 886                 }
 887         }
 888         for (IncludeChanList::const_iterator v = include_c.begin(); v != include_c.end(); ++v)
 889         {
 890                 Channel* c = (*v)->chan;
 891                 const Channel::MemberMap& ulist = c->GetUsers();
 892                 for (Channel::MemberMap::const_iterator i = ulist.begin(); i != ulist.end(); ++i)
 893                 {
 894                         LocalUser* u = IS_LOCAL(i->first);
 895                         if (u && u->already_sent != LocalUser::already_sent_id)
 896                         {
 897                                 u->already_sent = LocalUser::already_sent_id;
 898                                 u->Write(line);
 899                         }
 900                 }
 901         }
 902 }
 903
 904 void User::WriteCommonQuit(const std::string &normal_text, const std::string &oper_text)
 905 {
 906         if (this->registered != REG_ALL)
 907                 return;
 908
 909         already_sent_t uniq_id = ++LocalUser::already_sent_id;
 910
 911         const std::string normalMessage = ":" + this->GetFullHost() + " QUIT :" + normal_text;
 912         const std::string operMessage = ":" + this->GetFullHost() + " QUIT :" + oper_text;
 913
 914         IncludeChanList include_c(chans.begin(), chans.end());
 915         std::map<User*,bool> exceptions;
 916
 917         FOREACH_MOD(OnBuildNeighborList, (this, include_c, exceptions));
 918
 919         for (std::map<User*,bool>::iterator i = exceptions.begin(); i != exceptions.end(); ++i)
 920         {
 921                 LocalUser* u = IS_LOCAL(i->first);
 922                 if (u && !u->quitting)
 923                 {
 924                         u->already_sent = uniq_id;
 925                         if (i->second)
 926                                 u->Write(u->IsOper() ? operMessage : normalMessage);
 927                 }
 928         }
 929         for (IncludeChanList::const_iterator v = include_c.begin(); v != include_c.end(); ++v)
 930         {
 931                 const Channel::MemberMap& ulist = (*v)->chan->GetUsers();
 932                 for (Channel::MemberMap::const_iterator i = ulist.begin(); i != ulist.end(); i++)
 933                 {
 934                         LocalUser* u = IS_LOCAL(i->first);
 935                         if (u && (u->already_sent != uniq_id))
 936                         {
 937                                 u->already_sent = uniq_id;
 938                                 u->Write(u->IsOper() ? operMessage : normalMessage);
 939                         }
 940                 }
 941         }
 942 }
 943
 944 void LocalUser::SendText(const std::string& line)
 945 {
 946         Write(line);
 947 }
 948
 949 void RemoteUser::SendText(const std::string& line)
 950 {
 951         ServerInstance->PI->PushToClient(this, line);
 952 }
 953
 954 void FakeUser::SendText(const std::string& line)
 955 {
 956 }
 957
 958 void User::SendText(const char *text, ...)
 959 {
 960         std::string line;
 961         VAFORMAT(line, text, text);
 962         SendText(line);
 963 }
 964
 965 void User::SendText(const std::string& linePrefix, std::stringstream& textStream)
 966 {
 967         std::string line;
 968         std::string word;
 969         while (textStream >> word)
 970         {
 971                 size_t lineLength = linePrefix.length() + line.length() + word.length() + 3; // "\s\n\r"
 972                 if (lineLength > ServerInstance->Config->Limits.MaxLine)
 973                 {
 974                         SendText(linePrefix + line);
 975                         line.clear();
 976                 }
 977                 line += " " + word;
 978         }
 979         SendText(linePrefix + line);
 980 }
 981
 982 /* return 0 or 1 depending if users u and u2 share one or more common channels
 983  * (used by QUIT, NICK etc which arent channel specific notices)
 984  *
 985  * The old algorithm in 1.0 for this was relatively inefficient, iterating over
 986  * the first users channels then the second users channels within the outer loop,
 987  * therefore it was a maximum of x*y iterations (upon returning 0 and checking
 988  * all possible iterations). However this new function instead checks against the
 989  * channel's userlist in the inner loop which is a std::map<User*,User*>
 990  * and saves us time as we already know what pointer value we are after.
 991  * Don't quote me on the maths as i am not a mathematician or computer scientist,
 992  * but i believe this algorithm is now x+(log y) maximum iterations instead.
 993  */
 994 bool User::SharesChannelWith(User *other)
 995 {
 996         /* Outer loop */
 997         for (User::ChanList::iterator i = this->chans.begin(); i != this->chans.end(); ++i)
 998         {
 999                 /* Eliminate the inner loop (which used to be ~equal in size to the outer loop)
1000                  * by replacing it with a map::find which *should* be more efficient
1001                  */
1002                 if ((*i)->chan->HasUser(other))
1003                         return true;
1004         }
1005         return false;
1006 }
1007
1008 bool User::ChangeName(const std::string& gecos)
1009 {
1010         if (!this->fullname.compare(gecos))
1011                 return true;
1012
1013         if (IS_LOCAL(this))
1014         {
1015                 ModResult MOD_RESULT;
1016                 FIRST_MOD_RESULT(OnChangeLocalUserGECOS, MOD_RESULT, (IS_LOCAL(this),gecos));
1017                 if (MOD_RESULT == MOD_RES_DENY)
1018                         return false;
1019                 FOREACH_MOD(OnChangeName, (this,gecos));
1020         }
1021         this->fullname.assign(gecos, 0, ServerInstance->Config->Limits.MaxGecos);
1022
1023         return true;
1024 }
1025
1026 bool User::ChangeDisplayedHost(const std::string& shost)
1027 {
1028         if (dhost == shost)
1029                 return true;
1030
1031         if (IS_LOCAL(this))
1032         {
1033                 ModResult MOD_RESULT;
1034                 FIRST_MOD_RESULT(OnChangeLocalUserHost, MOD_RESULT, (IS_LOCAL(this),shost));
1035                 if (MOD_RESULT == MOD_RES_DENY)
1036                         return false;
1037         }
1038
1039         FOREACH_MOD(OnChangeHost, (this,shost));
1040
1041         this->dhost.assign(shost, 0, ServerInstance->Config->Limits.MaxHost);
1042         this->InvalidateCache();
1043
1044         if (IS_LOCAL(this))
1045                 this->WriteNumeric(RPL_YOURDISPLAYEDHOST, "%s :is now your displayed host", this->dhost.c_str());
1046
1047         return true;
1048 }
1049
1050 bool User::ChangeIdent(const std::string& newident)
1051 {
1052         if (this->ident == newident)
1053                 return true;
1054
1055         FOREACH_MOD(OnChangeIdent, (this,newident));
1056
1057         this->ident.assign(newident, 0, ServerInstance->Config->Limits.IdentMax);
1058         this->InvalidateCache();
1059
1060         return true;
1061 }
1062
1063 /*
1064  * Sets a user's connection class.
1065  * If the class name is provided, it will be used. Otherwise, the class will be guessed using host/ip/ident/etc.
1066  * NOTE: If the <ALLOW> or <DENY> tag specifies an ip, and this user resolves,
1067  * then their ip will be taken as 'priority' anyway, so for example,
1068  * <connect allow="127.0.0.1"> will match joe!bloggs@localhost
1069  */
1070 void LocalUser::SetClass(const std::string &explicit_name)
1071 {
1072         ConnectClass *found = NULL;
1073
1074         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Setting connect class for UID %s", this->uuid.c_str());
1075
1076         if (!explicit_name.empty())
1077         {
1078                 for (ServerConfig::ClassVector::const_iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); ++i)
1079                 {
1080                         ConnectClass* c = *i;
1081
1082                         if (explicit_name == c->name)
1083                         {
1084                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Explicitly set to %s", explicit_name.c_str());
1085                                 found = c;
1086                         }
1087                 }
1088         }
1089         else
1090         {
1091                 for (ServerConfig::ClassVector::const_iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); ++i)
1092                 {
1093                         ConnectClass* c = *i;
1094                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Checking %s", c->GetName().c_str());
1095
1096                         ModResult MOD_RESULT;
1097                         FIRST_MOD_RESULT(OnSetConnectClass, MOD_RESULT, (this,c));
1098                         if (MOD_RESULT == MOD_RES_DENY)
1099                                 continue;
1100                         if (MOD_RESULT == MOD_RES_ALLOW)
1101                         {
1102                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Class forced by module to %s", c->GetName().c_str());
1103                                 found = c;
1104                                 break;
1105                         }
1106
1107                         if (c->type == CC_NAMED)
1108                                 continue;
1109
1110                         bool regdone = (registered != REG_NONE);
1111                         if (c->config->getBool("registered", regdone) != regdone)
1112                                 continue;
1113
1114                         /* check if host matches.. */
1115                         if (!InspIRCd::MatchCIDR(this->GetIPString(), c->GetHost(), NULL) &&
1116                             !InspIRCd::MatchCIDR(this->host, c->GetHost(), NULL))
1117                         {
1118                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "No host match (for %s)", c->GetHost().c_str());
1119                                 continue;
1120                         }
1121
1122                         /*
1123                          * deny change if change will take class over the limit check it HERE, not after we found a matching class,
1124                          * because we should attempt to find another class if this one doesn't match us. -- w00t
1125                          */
1126                         if (c->limit && (c->GetReferenceCount() >= c->limit))
1127                         {
1128                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "OOPS: Connect class limit (%lu) hit, denying", c->limit);
1129                                 continue;
1130                         }
1131
1132                         /* if it requires a port ... */
1133                         int port = c->config->getInt("port");
1134                         if (port)
1135                         {
1136                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Requires port (%d)", port);
1137
1138                                 /* and our port doesn't match, fail. */
1139                                 if (this->GetServerPort() != port)
1140                                         continue;
1141                         }
1142
1143                         if (regdone && !c->config->getString("password").empty())
1144                         {
1145                                 if (!ServerInstance->PassCompare(this, c->config->getString("password"), password, c->config->getString("hash")))
1146                                 {
1147                                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Bad password, skipping");
1148                                         continue;
1149                                 }
1150                         }
1151
1152                         /* we stop at the first class that meets ALL critera. */
1153                         found = c;
1154                         break;
1155                 }
1156         }
1157
1158         /*
1159          * Okay, assuming we found a class that matches.. switch us into that class, keeping refcounts up to date.
1160          */
1161         if (found)
1162         {
1163                 MyClass = found;
1164         }
1165 }
1166
1167 void User::PurgeEmptyChannels()
1168 {
1169         // firstly decrement the count on each channel
1170         for (User::ChanList::iterator i = this->chans.begin(); i != this->chans.end(); )
1171         {
1172                 Channel* c = (*i)->chan;
1173                 ++i;
1174                 c->DelUser(this);
1175         }
1176
1177         this->UnOper();
1178 }
1179
1180 const std::string& FakeUser::GetFullHost()
1181 {
1182         if (!ServerInstance->Config->HideWhoisServer.empty())
1183                 return ServerInstance->Config->HideWhoisServer;
1184         return server->GetName();
1185 }
1186
1187 const std::string& FakeUser::GetFullRealHost()
1188 {
1189         if (!ServerInstance->Config->HideWhoisServer.empty())
1190                 return ServerInstance->Config->HideWhoisServer;
1191         return server->GetName();
1192 }
1193
1194 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask)
1195         : config(tag), type(t), fakelag(true), name("unnamed"), registration_timeout(0), host(mask),
1196         pingtime(0), softsendqmax(0), hardsendqmax(0), recvqmax(0),
1197         penaltythreshold(0), commandrate(0), maxlocal(0), maxglobal(0), maxconnwarn(true), maxchans(ServerInstance->Config->MaxChans),
1198         limit(0), resolvehostnames(true)
1199 {
1200 }
1201
1202 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask, const ConnectClass& parent)
1203         : config(tag), type(t), fakelag(parent.fakelag), name("unnamed"),
1204         registration_timeout(parent.registration_timeout), host(mask), pingtime(parent.pingtime),
1205         softsendqmax(parent.softsendqmax), hardsendqmax(parent.hardsendqmax), recvqmax(parent.recvqmax),
1206         penaltythreshold(parent.penaltythreshold), commandrate(parent.commandrate),
1207         maxlocal(parent.maxlocal), maxglobal(parent.maxglobal), maxconnwarn(parent.maxconnwarn), maxchans(parent.maxchans),
1208         limit(parent.limit), resolvehostnames(parent.resolvehostnames)
1209 {
1210 }
1211
1212 void ConnectClass::Update(const ConnectClass* src)
1213 {
1214         config = src->config;
1215         type = src->type;
1216         fakelag = src->fakelag;
1217         name = src->name;
1218         registration_timeout = src->registration_timeout;
1219         host = src->host;
1220         pingtime = src->pingtime;
1221         softsendqmax = src->softsendqmax;
1222         hardsendqmax = src->hardsendqmax;
1223         recvqmax = src->recvqmax;
1224         penaltythreshold = src->penaltythreshold;
1225         commandrate = src->commandrate;
1226         maxlocal = src->maxlocal;
1227         maxglobal = src->maxglobal;
1228         maxconnwarn = src->maxconnwarn;
1229         maxchans = src->maxchans;
1230         limit = src->limit;
1231         resolvehostnames = src->resolvehostnames;
1232 }