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         if (ServerInstance->FindUUID(uuid))
 101                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "User destructor for %s called without cull", uuid.c_str());
 102 }
 103
 104 const std::string& User::MakeHost()
 105 {
 106         if (!this->cached_makehost.empty())
 107                 return this->cached_makehost;
 108
 109         // XXX: Is there really a need to cache this?
 110         this->cached_makehost = ident + "@" + host;
 111         return this->cached_makehost;
 112 }
 113
 114 const std::string& User::MakeHostIP()
 115 {
 116         if (!this->cached_hostip.empty())
 117                 return this->cached_hostip;
 118
 119         // XXX: Is there really a need to cache this?
 120         this->cached_hostip = ident + "@" + this->GetIPString();
 121         return this->cached_hostip;
 122 }
 123
 124 const std::string& User::GetFullHost()
 125 {
 126         if (!this->cached_fullhost.empty())
 127                 return this->cached_fullhost;
 128
 129         // XXX: Is there really a need to cache this?
 130         this->cached_fullhost = nick + "!" + ident + "@" + dhost;
 131         return this->cached_fullhost;
 132 }
 133
 134 const std::string& User::GetFullRealHost()
 135 {
 136         if (!this->cached_fullrealhost.empty())
 137                 return this->cached_fullrealhost;
 138
 139         // XXX: Is there really a need to cache this?
 140         this->cached_fullrealhost = nick + "!" + ident + "@" + host;
 141         return this->cached_fullrealhost;
 142 }
 143
 144 InviteList& LocalUser::GetInviteList()
 145 {
 146         RemoveExpiredInvites();
 147         return invites;
 148 }
 149
 150 bool LocalUser::RemoveInvite(Channel* chan)
 151 {
 152         Invitation* inv = Invitation::Find(chan, this);
 153         if (inv)
 154         {
 155                 delete inv;
 156                 return true;
 157         }
 158         return false;
 159 }
 160
 161 void LocalUser::RemoveExpiredInvites()
 162 {
 163         Invitation::Find(NULL, this);
 164 }
 165
 166 bool User::HasModePermission(unsigned char, ModeType)
 167 {
 168         return true;
 169 }
 170
 171 bool LocalUser::HasModePermission(unsigned char mode, ModeType type)
 172 {
 173         if (!this->IsOper())
 174                 return false;
 175
 176         if (mode < 'A' || mode > ('A' + 64)) return false;
 177
 178         return ((type == MODETYPE_USER ? oper->AllowedUserModes : oper->AllowedChanModes))[(mode - 'A')];
 179
 180 }
 181 /*
 182  * users on remote servers can completely bypass all permissions based checks.
 183  * This prevents desyncs when one server has different type/class tags to another.
 184  * That having been said, this does open things up to the possibility of source changes
 185  * allowing remote kills, etc - but if they have access to the src, they most likely have
 186  * access to the conf - so it's an end to a means either way.
 187  */
 188 bool User::HasPermission(const std::string&)
 189 {
 190         return true;
 191 }
 192
 193 bool LocalUser::HasPermission(const std::string &command)
 194 {
 195         // are they even an oper at all?
 196         if (!this->IsOper())
 197         {
 198                 return false;
 199         }
 200
 201         if (oper->AllowedOperCommands.find(command) != oper->AllowedOperCommands.end())
 202                 return true;
 203         else if (oper->AllowedOperCommands.find("*") != oper->AllowedOperCommands.end())
 204                 return true;
 205
 206         return false;
 207 }
 208
 209 bool User::HasPrivPermission(const std::string &privstr, bool noisy)
 210 {
 211         return true;
 212 }
 213
 214 bool LocalUser::HasPrivPermission(const std::string &privstr, bool noisy)
 215 {
 216         if (!this->IsOper())
 217         {
 218                 if (noisy)
 219                         this->WriteNotice("You are not an oper");
 220                 return false;
 221         }
 222
 223         if (oper->AllowedPrivs.find(privstr) != oper->AllowedPrivs.end())
 224         {
 225                 return true;
 226         }
 227         else if (oper->AllowedPrivs.find("*") != oper->AllowedPrivs.end())
 228         {
 229                 return true;
 230         }
 231
 232         if (noisy)
 233                 this->WriteNotice("Oper type " + oper->name + " does not have access to priv " + privstr);
 234
 235         return false;
 236 }
 237
 238 void UserIOHandler::OnDataReady()
 239 {
 240         if (user->quitting)
 241                 return;
 242
 243         if (recvq.length() > user->MyClass->GetRecvqMax() && !user->HasPrivPermission("users/flood/increased-buffers"))
 244         {
 245                 ServerInstance->Users->QuitUser(user, "RecvQ exceeded");
 246                 ServerInstance->SNO->WriteToSnoMask('a', "User %s RecvQ of %lu exceeds connect class maximum of %lu",
 247                         user->nick.c_str(), (unsigned long)recvq.length(), user->MyClass->GetRecvqMax());
 248                 return;
 249         }
 250         unsigned long sendqmax = ULONG_MAX;
 251         if (!user->HasPrivPermission("users/flood/increased-buffers"))
 252                 sendqmax = user->MyClass->GetSendqSoftMax();
 253         unsigned long penaltymax = ULONG_MAX;
 254         if (!user->HasPrivPermission("users/flood/no-fakelag"))
 255                 penaltymax = user->MyClass->GetPenaltyThreshold() * 1000;
 256
 257         while (user->CommandFloodPenalty < penaltymax && getSendQSize() < sendqmax)
 258         {
 259                 std::string line;
 260                 line.reserve(ServerInstance->Config->Limits.MaxLine);
 261                 std::string::size_type qpos = 0;
 262                 while (qpos < recvq.length())
 263                 {
 264                         char c = recvq[qpos++];
 265                         switch (c)
 266                         {
 267                         case '\0':
 268                                 c = ' ';
 269                                 break;
 270                         case '\r':
 271                                 continue;
 272                         case '\n':
 273                                 goto eol_found;
 274                         }
 275                         if (line.length() < ServerInstance->Config->Limits.MaxLine - 2)
 276                                 line.push_back(c);
 277                 }
 278                 // if we got here, the recvq ran out before we found a newline
 279                 return;
 280 eol_found:
 281                 // just found a newline. Terminate the string, and pull it out of recvq
 282                 recvq = recvq.substr(qpos);
 283
 284                 // TODO should this be moved to when it was inserted in recvq?
 285                 ServerInstance->stats.Recv += qpos;
 286                 user->bytes_in += qpos;
 287                 user->cmds_in++;
 288
 289                 ServerInstance->Parser.ProcessBuffer(line, user);
 290                 if (user->quitting)
 291                         return;
 292         }
 293         if (user->CommandFloodPenalty >= penaltymax && !user->MyClass->fakelag)
 294                 ServerInstance->Users->QuitUser(user, "Excess Flood");
 295 }
 296
 297 void UserIOHandler::AddWriteBuf(const std::string &data)
 298 {
 299         if (user->quitting_sendq)
 300                 return;
 301         if (!user->quitting && getSendQSize() + data.length() > user->MyClass->GetSendqHardMax() &&
 302                 !user->HasPrivPermission("users/flood/increased-buffers"))
 303         {
 304                 user->quitting_sendq = true;
 305                 ServerInstance->GlobalCulls.AddSQItem(user);
 306                 return;
 307         }
 308
 309         // We still want to append data to the sendq of a quitting user,
 310         // e.g. their ERROR message that says 'closing link'
 311
 312         WriteData(data);
 313 }
 314
 315 void UserIOHandler::OnError(BufferedSocketError)
 316 {
 317         ServerInstance->Users->QuitUser(user, getError());
 318 }
 319
 320 CullResult User::cull()
 321 {
 322         if (!quitting)
 323                 ServerInstance->Users->QuitUser(this, "Culled without QuitUser");
 324
 325         if (client_sa.sa.sa_family != AF_UNSPEC)
 326                 ServerInstance->Users->RemoveCloneCounts(this);
 327
 328         return Extensible::cull();
 329 }
 330
 331 CullResult LocalUser::cull()
 332 {
 333         ServerInstance->Users->local_users.erase(this);
 334         ClearInvites();
 335         eh.cull();
 336         return User::cull();
 337 }
 338
 339 CullResult FakeUser::cull()
 340 {
 341         // Fake users don't quit, they just get culled.
 342         quitting = true;
 343         // Fake users are not inserted into UserManager::clientlist, they're only in the uuidlist
 344         ServerInstance->Users->uuidlist.erase(uuid);
 345         return User::cull();
 346 }
 347
 348 void User::Oper(OperInfo* info)
 349 {
 350         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
 351         if (this->IsModeSet(opermh))
 352                 this->UnOper();
 353
 354         this->SetMode(opermh, true);
 355         this->oper = info;
 356         this->WriteCommand("MODE", "+o");
 357         FOREACH_MOD(OnOper, (this, info->name));
 358
 359         std::string opername;
 360         if (info->oper_block)
 361                 opername = info->oper_block->getString("name");
 362
 363         if (IS_LOCAL(this))
 364         {
 365                 LocalUser* l = IS_LOCAL(this);
 366                 std::string vhost = oper->getConfig("vhost");
 367                 if (!vhost.empty())
 368                         l->ChangeDisplayedHost(vhost.c_str());
 369                 std::string opClass = oper->getConfig("class");
 370                 if (!opClass.empty())
 371                         l->SetClass(opClass);
 372         }
 373
 374         ServerInstance->SNO->WriteToSnoMask('o',"%s (%s@%s) is now an IRC operator of type %s (using oper '%s')",
 375                 nick.c_str(), ident.c_str(), host.c_str(), oper->name.c_str(), opername.c_str());
 376         this->WriteNumeric(RPL_YOUAREOPER, ":You are now %s %s", strchr("aeiouAEIOU", oper->name[0]) ? "an" : "a", oper->name.c_str());
 377
 378         ServerInstance->Logs->Log("OPER", LOG_DEFAULT, "%s opered as type: %s", GetFullRealHost().c_str(), oper->name.c_str());
 379         ServerInstance->Users->all_opers.push_back(this);
 380
 381         // Expand permissions from config for faster lookup
 382         if (IS_LOCAL(this))
 383                 oper->init();
 384
 385         FOREACH_MOD(OnPostOper, (this, oper->name, opername));
 386 }
 387
 388 void OperInfo::init()
 389 {
 390         AllowedOperCommands.clear();
 391         AllowedPrivs.clear();
 392         AllowedUserModes.reset();
 393         AllowedChanModes.reset();
 394         AllowedUserModes['o' - 'A'] = true; // Call me paranoid if you want.
 395
 396         for(std::vector<reference<ConfigTag> >::iterator iter = class_blocks.begin(); iter != class_blocks.end(); ++iter)
 397         {
 398                 ConfigTag* tag = *iter;
 399                 std::string mycmd, mypriv;
 400                 /* Process commands */
 401                 irc::spacesepstream CommandList(tag->getString("commands"));
 402                 while (CommandList.GetToken(mycmd))
 403                 {
 404                         AllowedOperCommands.insert(mycmd);
 405                 }
 406
 407                 irc::spacesepstream PrivList(tag->getString("privs"));
 408                 while (PrivList.GetToken(mypriv))
 409                 {
 410                         AllowedPrivs.insert(mypriv);
 411                 }
 412
 413                 std::string modes = tag->getString("usermodes");
 414                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
 415                 {
 416                         if (*c == '*')
 417                         {
 418                                 this->AllowedUserModes.set();
 419                         }
 420                         else if (*c >= 'A' && *c < 'z')
 421                         {
 422                                 this->AllowedUserModes[*c - 'A'] = true;
 423                         }
 424                 }
 425
 426                 modes = tag->getString("chanmodes");
 427                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
 428                 {
 429                         if (*c == '*')
 430                         {
 431                                 this->AllowedChanModes.set();
 432                         }
 433                         else if (*c >= 'A' && *c < 'z')
 434                         {
 435                                 this->AllowedChanModes[*c - 'A'] = true;
 436                         }
 437                 }
 438         }
 439 }
 440
 441 void User::UnOper()
 442 {
 443         if (!this->IsOper())
 444                 return;
 445
 446         /*
 447          * unset their oper type (what IS_OPER checks).
 448          * note, order is important - this must come before modes as -o attempts
 449          * to call UnOper. -- w00t
 450          */
 451         oper = NULL;
 452
 453
 454         /* Remove all oper only modes from the user when the deoper - Bug #466*/
 455         std::string moderemove("-");
 456
 457         for (unsigned char letter = 'A'; letter <= 'z'; letter++)
 458         {
 459                 ModeHandler* mh = ServerInstance->Modes->FindMode(letter, MODETYPE_USER);
 460                 if (mh && mh->NeedsOper())
 461                         moderemove += letter;
 462         }
 463
 464
 465         std::vector<std::string> parameters;
 466         parameters.push_back(this->nick);
 467         parameters.push_back(moderemove);
 468
 469         ServerInstance->Modes->Process(parameters, this);
 470
 471         // Remove the user from the oper list
 472         stdalgo::vector::swaperase(ServerInstance->Users->all_opers, this);
 473
 474         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
 475         this->SetMode(opermh, false);
 476 }
 477
 478 /*
 479  * Check class restrictions
 480  */
 481 void LocalUser::CheckClass(bool clone_count)
 482 {
 483         ConnectClass* a = this->MyClass;
 484
 485         if (!a)
 486         {
 487                 ServerInstance->Users->QuitUser(this, "Access denied by configuration");
 488                 return;
 489         }
 490         else if (a->type == CC_DENY)
 491         {
 492                 ServerInstance->Users->QuitUser(this, a->config->getString("reason", "Unauthorised connection"));
 493                 return;
 494         }
 495         else if (clone_count)
 496         {
 497                 const UserManager::CloneCounts& clonecounts = ServerInstance->Users->GetCloneCounts(this);
 498                 if ((a->GetMaxLocal()) && (clonecounts.local > a->GetMaxLocal()))
 499                 {
 500                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (local)");
 501                         if (a->maxconnwarn)
 502                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum LOCAL connections (%ld) exceeded for IP %s", a->GetMaxLocal(), this->GetIPString().c_str());
 503                         return;
 504                 }
 505                 else if ((a->GetMaxGlobal()) && (clonecounts.global > a->GetMaxGlobal()))
 506                 {
 507                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (global)");
 508                         if (a->maxconnwarn)
 509                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum GLOBAL connections (%ld) exceeded for IP %s", a->GetMaxGlobal(), this->GetIPString().c_str());
 510                         return;
 511                 }
 512         }
 513
 514         this->nping = ServerInstance->Time() + a->GetPingTime() + ServerInstance->Config->dns_timeout;
 515 }
 516
 517 bool LocalUser::CheckLines(bool doZline)
 518 {
 519         const char* check[] = { "G" , "K", (doZline) ? "Z" : NULL, NULL };
 520
 521         if (!this->exempt)
 522         {
 523                 for (int n = 0; check[n]; ++n)
 524                 {
 525                         XLine *r = ServerInstance->XLines->MatchesLine(check[n], this);
 526
 527                         if (r)
 528                         {
 529                                 r->Apply(this);
 530                                 return true;
 531                         }
 532                 }
 533         }
 534
 535         return false;
 536 }
 537
 538 void LocalUser::FullConnect()
 539 {
 540         ServerInstance->stats.Connects++;
 541         this->idle_lastmsg = ServerInstance->Time();
 542
 543         /*
 544          * You may be thinking "wtf, we checked this in User::AddClient!" - and yes, we did, BUT.
 545          * At the time AddClient is called, we don't have a resolved host, by here we probably do - which
 546          * may put the user into a totally seperate class with different restrictions! so we *must* check again.
 547          * Don't remove this! -- w00t
 548          */
 549         MyClass = NULL;
 550         SetClass();
 551         CheckClass();
 552         CheckLines();
 553
 554         if (quitting)
 555                 return;
 556
 557         this->WriteNumeric(RPL_WELCOME, ":Welcome to the %s IRC Network %s", ServerInstance->Config->Network.c_str(), GetFullRealHost().c_str());
 558         this->WriteNumeric(RPL_YOURHOSTIS, ":Your host is %s, running version %s", ServerInstance->Config->ServerName.c_str(), INSPIRCD_BRANCH);
 559         this->WriteNumeric(RPL_SERVERCREATED, ":This server was created %s %s", __TIME__, __DATE__);
 560
 561         const std::string& modelist = ServerInstance->Modes->GetModeListFor004Numeric();
 562         this->WriteNumeric(RPL_SERVERVERSION, "%s %s %s", ServerInstance->Config->ServerName.c_str(), INSPIRCD_BRANCH, modelist.c_str());
 563
 564         ServerInstance->ISupport.SendTo(this);
 565
 566         /* Now registered */
 567         if (ServerInstance->Users->unregistered_count)
 568                 ServerInstance->Users->unregistered_count--;
 569
 570         /* Trigger MOTD and LUSERS output, give modules a chance too */
 571         ModResult MOD_RESULT;
 572         std::string command("LUSERS");
 573         std::vector<std::string> parameters;
 574         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, parameters, this, true, command));
 575         if (!MOD_RESULT)
 576                 ServerInstance->Parser.CallHandler(command, parameters, this);
 577
 578         MOD_RESULT = MOD_RES_PASSTHRU;
 579         command = "MOTD";
 580         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, parameters, this, true, command));
 581         if (!MOD_RESULT)
 582                 ServerInstance->Parser.CallHandler(command, parameters, this);
 583
 584         if (ServerInstance->Config->RawLog)
 585                 WriteServ("PRIVMSG %s :*** Raw I/O logging is enabled on this server. All messages, passwords, and commands are being recorded.", nick.c_str());
 586
 587         /*
 588          * We don't set REG_ALL until triggering OnUserConnect, so some module events don't spew out stuff
 589          * for a user that doesn't exist yet.
 590          */
 591         FOREACH_MOD(OnUserConnect, (this));
 592
 593         this->registered = REG_ALL;
 594
 595         FOREACH_MOD(OnPostConnect, (this));
 596
 597         ServerInstance->SNO->WriteToSnoMask('c',"Client connecting on port %d (class %s): %s (%s) [%s]",
 598                 this->GetServerPort(), this->MyClass->name.c_str(), GetFullRealHost().c_str(), this->GetIPString().c_str(), this->fullname.c_str());
 599         ServerInstance->Logs->Log("BANCACHE", LOG_DEBUG, "BanCache: Adding NEGATIVE hit for " + this->GetIPString());
 600         ServerInstance->BanCache.AddHit(this->GetIPString(), "", "");
 601         // reset the flood penalty (which could have been raised due to things like auto +x)
 602         CommandFloodPenalty = 0;
 603 }
 604
 605 void User::InvalidateCache()
 606 {
 607         /* Invalidate cache */
 608         cached_fullhost.clear();
 609         cached_hostip.clear();
 610         cached_makehost.clear();
 611         cached_fullrealhost.clear();
 612 }
 613
 614 bool User::ChangeNick(const std::string& newnick, time_t newts)
 615 {
 616         if (quitting)
 617         {
 618                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "ERROR: Attempted to change nick of a quitting user: " + this->nick);
 619                 return false;
 620         }
 621
 622         User* const InUse = ServerInstance->FindNickOnly(newnick);
 623         if (InUse == this)
 624         {
 625                 // case change, don't need to check campers
 626                 // and, if it's identical including case, we can leave right now
 627                 // We also don't update the nick TS if it's a case change, either
 628                 if (newnick == nick)
 629                         return true;
 630         }
 631         else
 632         {
 633                 /*
 634                  * Uh oh.. if the nickname is in use, and it's not in use by the person using it (doh) --
 635                  * then we have a potential collide. Check whether someone else is camping on the nick
 636                  * (i.e. connect -> send NICK, don't send USER.) If they are camping, force-change the
 637                  * camper to their UID, and allow the incoming nick change.
 638                  *
 639                  * If the guy using the nick is already using it, tell the incoming nick change to gtfo,
 640                  * because the nick is already (rightfully) in use. -- w00t
 641                  */
 642                 if (InUse)
 643                 {
 644                         if (InUse->registered != REG_ALL)
 645                         {
 646                                 /* force the camper to their UUID, and ask them to re-send a NICK. */
 647                                 InUse->WriteFrom(InUse, "NICK %s", InUse->uuid.c_str());
 648                                 InUse->WriteNumeric(ERR_NICKNAMEINUSE, "%s :Nickname overruled.", InUse->nick.c_str());
 649
 650                                 InUse->registered &= ~REG_NICK;
 651                                 InUse->ChangeNick(InUse->uuid);
 652                         }
 653                         else
 654                         {
 655                                 /* No camping, tell the incoming user  to stop trying to change nick ;p */
 656                                 this->WriteNumeric(ERR_NICKNAMEINUSE, "%s :Nickname is already in use.", newnick.c_str());
 657                                 return false;
 658                         }
 659                 }
 660
 661                 age = newts ? newts : ServerInstance->Time();
 662         }
 663
 664         if (this->registered == REG_ALL)
 665                 this->WriteCommon("NICK %s",newnick.c_str());
 666         std::string oldnick = nick;
 667         nick = newnick;
 668
 669         InvalidateCache();
 670         ServerInstance->Users->clientlist.erase(oldnick);
 671         ServerInstance->Users->clientlist[newnick] = this;
 672
 673         if (registered == REG_ALL)
 674                 FOREACH_MOD(OnUserPostNick, (this,oldnick));
 675
 676         return true;
 677 }
 678
 679 int LocalUser::GetServerPort()
 680 {
 681         switch (this->server_sa.sa.sa_family)
 682         {
 683                 case AF_INET6:
 684                         return htons(this->server_sa.in6.sin6_port);
 685                 case AF_INET:
 686                         return htons(this->server_sa.in4.sin_port);
 687         }
 688         return 0;
 689 }
 690
 691 const std::string& User::GetIPString()
 692 {
 693         int port;
 694         if (cachedip.empty())
 695         {
 696                 irc::sockets::satoap(client_sa, cachedip, port);
 697                 /* IP addresses starting with a : on irc are a Bad Thing (tm) */
 698                 if (cachedip[0] == ':')
 699                         cachedip.insert(cachedip.begin(),1,'0');
 700         }
 701
 702         return cachedip;
 703 }
 704
 705 irc::sockets::cidr_mask User::GetCIDRMask()
 706 {
 707         int range = 0;
 708         switch (client_sa.sa.sa_family)
 709         {
 710                 case AF_INET6:
 711                         range = ServerInstance->Config->c_ipv6_range;
 712                         break;
 713                 case AF_INET:
 714                         range = ServerInstance->Config->c_ipv4_range;
 715                         break;
 716         }
 717         return irc::sockets::cidr_mask(client_sa, range);
 718 }
 719
 720 bool User::SetClientIP(const char* sip, bool recheck_eline)
 721 {
 722         cachedip.clear();
 723         cached_hostip.clear();
 724         return irc::sockets::aptosa(sip, 0, client_sa);
 725 }
 726
 727 void User::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
 728 {
 729         cachedip.clear();
 730         cached_hostip.clear();
 731         memcpy(&client_sa, &sa, sizeof(irc::sockets::sockaddrs));
 732 }
 733
 734 bool LocalUser::SetClientIP(const char* sip, bool recheck_eline)
 735 {
 736         irc::sockets::sockaddrs sa;
 737         if (!irc::sockets::aptosa(sip, 0, sa))
 738                 // Invalid
 739                 return false;
 740
 741         LocalUser::SetClientIP(sa, recheck_eline);
 742         return true;
 743 }
 744
 745 void LocalUser::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
 746 {
 747         if (sa != client_sa)
 748         {
 749                 User::SetClientIP(sa);
 750                 if (recheck_eline)
 751                         this->exempt = (ServerInstance->XLines->MatchesLine("E", this) != NULL);
 752
 753                 FOREACH_MOD(OnSetUserIP, (this));
 754         }
 755 }
 756
 757 static std::string wide_newline("\r\n");
 758
 759 void User::Write(const std::string& text)
 760 {
 761 }
 762
 763 void User::Write(const char *text, ...)
 764 {
 765 }
 766
 767 void LocalUser::Write(const std::string& text)
 768 {
 769         if (!SocketEngine::BoundsCheckFd(&eh))
 770                 return;
 771
 772         if (text.length() > ServerInstance->Config->Limits.MaxLine - 2)
 773         {
 774                 // this should happen rarely or never. Crop the string at 512 and try again.
 775                 std::string try_again = text.substr(0, ServerInstance->Config->Limits.MaxLine - 2);
 776                 Write(try_again);
 777                 return;
 778         }
 779
 780         ServerInstance->Logs->Log("USEROUTPUT", LOG_RAWIO, "C[%s] O %s", uuid.c_str(), text.c_str());
 781
 782         eh.AddWriteBuf(text);
 783         eh.AddWriteBuf(wide_newline);
 784
 785         ServerInstance->stats.Sent += text.length() + 2;
 786         this->bytes_out += text.length() + 2;
 787         this->cmds_out++;
 788 }
 789
 790 /** Write()
 791  */
 792 void LocalUser::Write(const char *text, ...)
 793 {
 794         std::string textbuffer;
 795         VAFORMAT(textbuffer, text, text);
 796         this->Write(textbuffer);
 797 }
 798
 799 void User::WriteServ(const std::string& text)
 800 {
 801         this->Write(":%s %s",ServerInstance->Config->ServerName.c_str(),text.c_str());
 802 }
 803
 804 /** WriteServ()
 805  *  Same as Write(), except `text' is prefixed with `:server.name '.
 806  */
 807 void User::WriteServ(const char* text, ...)
 808 {
 809         std::string textbuffer;
 810         VAFORMAT(textbuffer, text, text);
 811         this->WriteServ(textbuffer);
 812 }
 813
 814 void User::WriteCommand(const char* command, const std::string& text)
 815 {
 816         this->WriteServ(command + (this->registered & REG_NICK ? " " + this->nick : " *") + " " + text);
 817 }
 818
 819 void User::WriteNumeric(unsigned int numeric, const char* text, ...)
 820 {
 821         std::string textbuffer;
 822         VAFORMAT(textbuffer, text, text);
 823         this->WriteNumeric(numeric, textbuffer);
 824 }
 825
 826 void User::WriteNumeric(unsigned int numeric, const std::string &text)
 827 {
 828         ModResult MOD_RESULT;
 829
 830         FIRST_MOD_RESULT(OnNumeric, MOD_RESULT, (this, numeric, text));
 831
 832         if (MOD_RESULT == MOD_RES_DENY)
 833                 return;
 834
 835         const std::string message = InspIRCd::Format(":%s %03u %s %s", ServerInstance->Config->ServerName.c_str(),
 836                 numeric, this->registered & REG_NICK ? this->nick.c_str() : "*", text.c_str());
 837         this->Write(message);
 838 }
 839
 840 void User::WriteFrom(User *user, const std::string &text)
 841 {
 842         const std::string message = ":" + user->GetFullHost() + " " + text;
 843         this->Write(message);
 844 }
 845
 846
 847 /* write text from an originating user to originating user */
 848
 849 void User::WriteFrom(User *user, const char* text, ...)
 850 {
 851         std::string textbuffer;
 852         VAFORMAT(textbuffer, text, text);
 853         this->WriteFrom(user, textbuffer);
 854 }
 855
 856 void User::WriteCommon(const char* text, ...)
 857 {
 858         if (this->registered != REG_ALL || quitting)
 859                 return;
 860
 861         std::string textbuffer;
 862         VAFORMAT(textbuffer, text, text);
 863         textbuffer = ":" + this->GetFullHost() + " " + textbuffer;
 864         this->WriteCommonRaw(textbuffer, true);
 865 }
 866
 867 void User::WriteCommonRaw(const std::string &line, bool include_self)
 868 {
 869         if (this->registered != REG_ALL || quitting)
 870                 return;
 871
 872         LocalUser::already_sent_id++;
 873
 874         IncludeChanList include_c(chans.begin(), chans.end());
 875         std::map<User*,bool> exceptions;
 876
 877         exceptions[this] = include_self;
 878
 879         FOREACH_MOD(OnBuildNeighborList, (this, include_c, exceptions));
 880
 881         for (std::map<User*,bool>::iterator i = exceptions.begin(); i != exceptions.end(); ++i)
 882         {
 883                 LocalUser* u = IS_LOCAL(i->first);
 884                 if (u && !u->quitting)
 885                 {
 886                         u->already_sent = LocalUser::already_sent_id;
 887                         if (i->second)
 888                                 u->Write(line);
 889                 }
 890         }
 891         for (IncludeChanList::const_iterator v = include_c.begin(); v != include_c.end(); ++v)
 892         {
 893                 Channel* c = (*v)->chan;
 894                 const Channel::MemberMap& ulist = c->GetUsers();
 895                 for (Channel::MemberMap::const_iterator i = ulist.begin(); i != ulist.end(); ++i)
 896                 {
 897                         LocalUser* u = IS_LOCAL(i->first);
 898                         if (u && u->already_sent != LocalUser::already_sent_id)
 899                         {
 900                                 u->already_sent = LocalUser::already_sent_id;
 901                                 u->Write(line);
 902                         }
 903                 }
 904         }
 905 }
 906
 907 void User::WriteCommonQuit(const std::string &normal_text, const std::string &oper_text)
 908 {
 909         if (this->registered != REG_ALL)
 910                 return;
 911
 912         already_sent_t uniq_id = ++LocalUser::already_sent_id;
 913
 914         const std::string normalMessage = ":" + this->GetFullHost() + " QUIT :" + normal_text;
 915         const std::string operMessage = ":" + this->GetFullHost() + " QUIT :" + oper_text;
 916
 917         IncludeChanList include_c(chans.begin(), chans.end());
 918         std::map<User*,bool> exceptions;
 919
 920         FOREACH_MOD(OnBuildNeighborList, (this, include_c, exceptions));
 921
 922         for (std::map<User*,bool>::iterator i = exceptions.begin(); i != exceptions.end(); ++i)
 923         {
 924                 LocalUser* u = IS_LOCAL(i->first);
 925                 if (u && !u->quitting)
 926                 {
 927                         u->already_sent = uniq_id;
 928                         if (i->second)
 929                                 u->Write(u->IsOper() ? operMessage : normalMessage);
 930                 }
 931         }
 932         for (IncludeChanList::const_iterator v = include_c.begin(); v != include_c.end(); ++v)
 933         {
 934                 const Channel::MemberMap& ulist = (*v)->chan->GetUsers();
 935                 for (Channel::MemberMap::const_iterator i = ulist.begin(); i != ulist.end(); i++)
 936                 {
 937                         LocalUser* u = IS_LOCAL(i->first);
 938                         if (u && (u->already_sent != uniq_id))
 939                         {
 940                                 u->already_sent = uniq_id;
 941                                 u->Write(u->IsOper() ? operMessage : normalMessage);
 942                         }
 943                 }
 944         }
 945 }
 946
 947 void LocalUser::SendText(const std::string& line)
 948 {
 949         Write(line);
 950 }
 951
 952 void RemoteUser::SendText(const std::string& line)
 953 {
 954         ServerInstance->PI->PushToClient(this, line);
 955 }
 956
 957 void FakeUser::SendText(const std::string& line)
 958 {
 959 }
 960
 961 void User::SendText(const char *text, ...)
 962 {
 963         std::string line;
 964         VAFORMAT(line, text, text);
 965         SendText(line);
 966 }
 967
 968 void User::SendText(const std::string& linePrefix, std::stringstream& textStream)
 969 {
 970         std::string line;
 971         std::string word;
 972         while (textStream >> word)
 973         {
 974                 size_t lineLength = linePrefix.length() + line.length() + word.length() + 3; // "\s\n\r"
 975                 if (lineLength > ServerInstance->Config->Limits.MaxLine)
 976                 {
 977                         SendText(linePrefix + line);
 978                         line.clear();
 979                 }
 980                 line += " " + word;
 981         }
 982         SendText(linePrefix + line);
 983 }
 984
 985 /* return 0 or 1 depending if users u and u2 share one or more common channels
 986  * (used by QUIT, NICK etc which arent channel specific notices)
 987  *
 988  * The old algorithm in 1.0 for this was relatively inefficient, iterating over
 989  * the first users channels then the second users channels within the outer loop,
 990  * therefore it was a maximum of x*y iterations (upon returning 0 and checking
 991  * all possible iterations). However this new function instead checks against the
 992  * channel's userlist in the inner loop which is a std::map<User*,User*>
 993  * and saves us time as we already know what pointer value we are after.
 994  * Don't quote me on the maths as i am not a mathematician or computer scientist,
 995  * but i believe this algorithm is now x+(log y) maximum iterations instead.
 996  */
 997 bool User::SharesChannelWith(User *other)
 998 {
 999         /* Outer loop */
1000         for (User::ChanList::iterator i = this->chans.begin(); i != this->chans.end(); ++i)
1001         {
1002                 /* Eliminate the inner loop (which used to be ~equal in size to the outer loop)
1003                  * by replacing it with a map::find which *should* be more efficient
1004                  */
1005                 if ((*i)->chan->HasUser(other))
1006                         return true;
1007         }
1008         return false;
1009 }
1010
1011 bool User::ChangeName(const std::string& gecos)
1012 {
1013         if (!this->fullname.compare(gecos))
1014                 return true;
1015
1016         if (IS_LOCAL(this))
1017         {
1018                 ModResult MOD_RESULT;
1019                 FIRST_MOD_RESULT(OnChangeLocalUserGECOS, MOD_RESULT, (IS_LOCAL(this),gecos));
1020                 if (MOD_RESULT == MOD_RES_DENY)
1021                         return false;
1022                 FOREACH_MOD(OnChangeName, (this,gecos));
1023         }
1024         this->fullname.assign(gecos, 0, ServerInstance->Config->Limits.MaxGecos);
1025
1026         return true;
1027 }
1028
1029 bool User::ChangeDisplayedHost(const std::string& shost)
1030 {
1031         if (dhost == shost)
1032                 return true;
1033
1034         if (IS_LOCAL(this))
1035         {
1036                 ModResult MOD_RESULT;
1037                 FIRST_MOD_RESULT(OnChangeLocalUserHost, MOD_RESULT, (IS_LOCAL(this),shost));
1038                 if (MOD_RESULT == MOD_RES_DENY)
1039                         return false;
1040         }
1041
1042         FOREACH_MOD(OnChangeHost, (this,shost));
1043
1044         this->dhost.assign(shost, 0, ServerInstance->Config->Limits.MaxHost);
1045         this->InvalidateCache();
1046
1047         if (IS_LOCAL(this))
1048                 this->WriteNumeric(RPL_YOURDISPLAYEDHOST, "%s :is now your displayed host", this->dhost.c_str());
1049
1050         return true;
1051 }
1052
1053 bool User::ChangeIdent(const std::string& newident)
1054 {
1055         if (this->ident == newident)
1056                 return true;
1057
1058         FOREACH_MOD(OnChangeIdent, (this,newident));
1059
1060         this->ident.assign(newident, 0, ServerInstance->Config->Limits.IdentMax);
1061         this->InvalidateCache();
1062
1063         return true;
1064 }
1065
1066 /*
1067  * Sets a user's connection class.
1068  * If the class name is provided, it will be used. Otherwise, the class will be guessed using host/ip/ident/etc.
1069  * NOTE: If the <ALLOW> or <DENY> tag specifies an ip, and this user resolves,
1070  * then their ip will be taken as 'priority' anyway, so for example,
1071  * <connect allow="127.0.0.1"> will match joe!bloggs@localhost
1072  */
1073 void LocalUser::SetClass(const std::string &explicit_name)
1074 {
1075         ConnectClass *found = NULL;
1076
1077         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Setting connect class for UID %s", this->uuid.c_str());
1078
1079         if (!explicit_name.empty())
1080         {
1081                 for (ServerConfig::ClassVector::const_iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); ++i)
1082                 {
1083                         ConnectClass* c = *i;
1084
1085                         if (explicit_name == c->name)
1086                         {
1087                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Explicitly set to %s", explicit_name.c_str());
1088                                 found = c;
1089                         }
1090                 }
1091         }
1092         else
1093         {
1094                 for (ServerConfig::ClassVector::const_iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); ++i)
1095                 {
1096                         ConnectClass* c = *i;
1097                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Checking %s", c->GetName().c_str());
1098
1099                         ModResult MOD_RESULT;
1100                         FIRST_MOD_RESULT(OnSetConnectClass, MOD_RESULT, (this,c));
1101                         if (MOD_RESULT == MOD_RES_DENY)
1102                                 continue;
1103                         if (MOD_RESULT == MOD_RES_ALLOW)
1104                         {
1105                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Class forced by module to %s", c->GetName().c_str());
1106                                 found = c;
1107                                 break;
1108                         }
1109
1110                         if (c->type == CC_NAMED)
1111                                 continue;
1112
1113                         bool regdone = (registered != REG_NONE);
1114                         if (c->config->getBool("registered", regdone) != regdone)
1115                                 continue;
1116
1117                         /* check if host matches.. */
1118                         if (!InspIRCd::MatchCIDR(this->GetIPString(), c->GetHost(), NULL) &&
1119                             !InspIRCd::MatchCIDR(this->host, c->GetHost(), NULL))
1120                         {
1121                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "No host match (for %s)", c->GetHost().c_str());
1122                                 continue;
1123                         }
1124
1125                         /*
1126                          * deny change if change will take class over the limit check it HERE, not after we found a matching class,
1127                          * because we should attempt to find another class if this one doesn't match us. -- w00t
1128                          */
1129                         if (c->limit && (c->GetReferenceCount() >= c->limit))
1130                         {
1131                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "OOPS: Connect class limit (%lu) hit, denying", c->limit);
1132                                 continue;
1133                         }
1134
1135                         /* if it requires a port ... */
1136                         int port = c->config->getInt("port");
1137                         if (port)
1138                         {
1139                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Requires port (%d)", port);
1140
1141                                 /* and our port doesn't match, fail. */
1142                                 if (this->GetServerPort() != port)
1143                                         continue;
1144                         }
1145
1146                         if (regdone && !c->config->getString("password").empty())
1147                         {
1148                                 if (!ServerInstance->PassCompare(this, c->config->getString("password"), password, c->config->getString("hash")))
1149                                 {
1150                                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Bad password, skipping");
1151                                         continue;
1152                                 }
1153                         }
1154
1155                         /* we stop at the first class that meets ALL critera. */
1156                         found = c;
1157                         break;
1158                 }
1159         }
1160
1161         /*
1162          * Okay, assuming we found a class that matches.. switch us into that class, keeping refcounts up to date.
1163          */
1164         if (found)
1165         {
1166                 MyClass = found;
1167         }
1168 }
1169
1170 void User::PurgeEmptyChannels()
1171 {
1172         // firstly decrement the count on each channel
1173         for (User::ChanList::iterator i = this->chans.begin(); i != this->chans.end(); )
1174         {
1175                 Channel* c = (*i)->chan;
1176                 ++i;
1177                 c->DelUser(this);
1178         }
1179
1180         this->UnOper();
1181 }
1182
1183 const std::string& FakeUser::GetFullHost()
1184 {
1185         if (!ServerInstance->Config->HideWhoisServer.empty())
1186                 return ServerInstance->Config->HideWhoisServer;
1187         return server->GetName();
1188 }
1189
1190 const std::string& FakeUser::GetFullRealHost()
1191 {
1192         if (!ServerInstance->Config->HideWhoisServer.empty())
1193                 return ServerInstance->Config->HideWhoisServer;
1194         return server->GetName();
1195 }
1196
1197 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask)
1198         : config(tag), type(t), fakelag(true), name("unnamed"), registration_timeout(0), host(mask),
1199         pingtime(0), softsendqmax(0), hardsendqmax(0), recvqmax(0),
1200         penaltythreshold(0), commandrate(0), maxlocal(0), maxglobal(0), maxconnwarn(true), maxchans(ServerInstance->Config->MaxChans),
1201         limit(0), resolvehostnames(true)
1202 {
1203 }
1204
1205 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask, const ConnectClass& parent)
1206         : config(tag), type(t), fakelag(parent.fakelag), name("unnamed"),
1207         registration_timeout(parent.registration_timeout), host(mask), pingtime(parent.pingtime),
1208         softsendqmax(parent.softsendqmax), hardsendqmax(parent.hardsendqmax), recvqmax(parent.recvqmax),
1209         penaltythreshold(parent.penaltythreshold), commandrate(parent.commandrate),
1210         maxlocal(parent.maxlocal), maxglobal(parent.maxglobal), maxconnwarn(parent.maxconnwarn), maxchans(parent.maxchans),
1211         limit(parent.limit), resolvehostnames(parent.resolvehostnames)
1212 {
1213 }
1214
1215 void ConnectClass::Update(const ConnectClass* src)
1216 {
1217         config = src->config;
1218         type = src->type;
1219         fakelag = src->fakelag;
1220         name = src->name;
1221         registration_timeout = src->registration_timeout;
1222         host = src->host;
1223         pingtime = src->pingtime;
1224         softsendqmax = src->softsendqmax;
1225         hardsendqmax = src->hardsendqmax;
1226         recvqmax = src->recvqmax;
1227         penaltythreshold = src->penaltythreshold;
1228         commandrate = src->commandrate;
1229         maxlocal = src->maxlocal;
1230         maxglobal = src->maxglobal;
1231         maxconnwarn = src->maxconnwarn;
1232         maxchans = src->maxchans;
1233         limit = src->limit;
1234         resolvehostnames = src->resolvehostnames;
1235 }