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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 <stdarg.h>
28 #include "socketengine.h"
29 #include "xline.h"
30 #include "bancache.h"
31
32 already_sent_t LocalUser::already_sent_id = 0;
33
34 bool User::IsNoticeMaskSet(unsigned char sm)
35 {
36         if (!isalpha(sm))
37                 return false;
38         return (snomasks[sm-65]);
39 }
40
41 bool User::IsModeSet(unsigned char m)
42 {
43         if (!isalpha(m))
44                 return false;
45         return (modes[m-65]);
46 }
47
48 const char* User::FormatModes(bool showparameters)
49 {
50         static std::string data;
51         std::string params;
52         data.clear();
53
54         for (unsigned char n = 0; n < 64; n++)
55         {
56                 if (modes[n])
57                 {
58                         data.push_back(n + 65);
59                         ModeHandler* mh = ServerInstance->Modes->FindMode(n + 65, MODETYPE_USER);
60                         if (showparameters && mh && mh->GetNumParams(true))
61                         {
62                                 std::string p = mh->GetUserParameter(this);
63                                 if (p.length())
64                                         params.append(" ").append(p);
65                         }
66                 }
67         }
68         data += params;
69         return data.c_str();
70 }
71
72 User::User(const std::string& uid, Server* srv, int type)
73         : uuid(uid), server(srv), usertype(type)
74 {
75         age = ServerInstance->Time();
76         signon = 0;
77         registered = 0;
78         quitting = false;
79         client_sa.sa.sa_family = AF_UNSPEC;
80
81         ServerInstance->Logs->Log("USERS", LOG_DEBUG, "New UUID for user: %s", uuid.c_str());
82
83         if (!ServerInstance->Users->uuidlist->insert(std::make_pair(uuid, this)).second)
84                 throw CoreException("Duplicate UUID "+std::string(uuid)+" in User constructor");
85 }
86
87 LocalUser::LocalUser(int myfd, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* servaddr)
88         : User(ServerInstance->UIDGen.GetUID(), ServerInstance->FakeClient->server, USERTYPE_LOCAL), eh(this),
89         bytes_in(0), bytes_out(0), cmds_in(0), cmds_out(0), nping(0), CommandFloodPenalty(0),
90         already_sent(0)
91 {
92         exempt = quitting_sendq = false;
93         idle_lastmsg = 0;
94         ident = "unknown";
95         lastping = 0;
96         eh.SetFd(myfd);
97         memcpy(&client_sa, client, sizeof(irc::sockets::sockaddrs));
98         memcpy(&server_sa, servaddr, sizeof(irc::sockets::sockaddrs));
99         dhost = host = GetIPString();
100 }
101
102 User::~User()
103 {
104         if (ServerInstance->Users->uuidlist->find(uuid) != ServerInstance->Users->uuidlist->end())
105                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "User destructor for %s called without cull", uuid.c_str());
106 }
107
108 const std::string& User::MakeHost()
109 {
110         if (!this->cached_makehost.empty())
111                 return this->cached_makehost;
112
113         // XXX: Is there really a need to cache this?
114         this->cached_makehost = ident + "@" + host;
115         return this->cached_makehost;
116 }
117
118 const std::string& User::MakeHostIP()
119 {
120         if (!this->cached_hostip.empty())
121                 return this->cached_hostip;
122
123         // XXX: Is there really a need to cache this?
124         this->cached_hostip = ident + "@" + this->GetIPString();
125         return this->cached_hostip;
126 }
127
128 const std::string& User::GetFullHost()
129 {
130         if (!this->cached_fullhost.empty())
131                 return this->cached_fullhost;
132
133         // XXX: Is there really a need to cache this?
134         this->cached_fullhost = nick + "!" + ident + "@" + dhost;
135         return this->cached_fullhost;
136 }
137
138 const std::string& User::GetFullRealHost()
139 {
140         if (!this->cached_fullrealhost.empty())
141                 return this->cached_fullrealhost;
142
143         // XXX: Is there really a need to cache this?
144         this->cached_fullrealhost = nick + "!" + ident + "@" + host;
145         return this->cached_fullrealhost;
146 }
147
148 InviteList& LocalUser::GetInviteList()
149 {
150         RemoveExpiredInvites();
151         return invites;
152 }
153
154 bool LocalUser::RemoveInvite(Channel* chan)
155 {
156         Invitation* inv = Invitation::Find(chan, this);
157         if (inv)
158         {
159                 delete inv;
160                 return true;
161         }
162         return false;
163 }
164
165 void LocalUser::RemoveExpiredInvites()
166 {
167         Invitation::Find(NULL, this);
168 }
169
170 bool User::HasModePermission(unsigned char, ModeType)
171 {
172         return true;
173 }
174
175 bool LocalUser::HasModePermission(unsigned char mode, ModeType type)
176 {
177         if (!this->IsOper())
178                 return false;
179
180         if (mode < 'A' || mode > ('A' + 64)) return false;
181
182         return ((type == MODETYPE_USER ? oper->AllowedUserModes : oper->AllowedChanModes))[(mode - 'A')];
183
184 }
185 /*
186  * users on remote servers can completely bypass all permissions based checks.
187  * This prevents desyncs when one server has different type/class tags to another.
188  * That having been said, this does open things up to the possibility of source changes
189  * allowing remote kills, etc - but if they have access to the src, they most likely have
190  * access to the conf - so it's an end to a means either way.
191  */
192 bool User::HasPermission(const std::string&)
193 {
194         return true;
195 }
196
197 bool LocalUser::HasPermission(const std::string &command)
198 {
199         // are they even an oper at all?
200         if (!this->IsOper())
201         {
202                 return false;
203         }
204
205         if (oper->AllowedOperCommands.find(command) != oper->AllowedOperCommands.end())
206                 return true;
207         else if (oper->AllowedOperCommands.find("*") != oper->AllowedOperCommands.end())
208                 return true;
209
210         return false;
211 }
212
213 bool User::HasPrivPermission(const std::string &privstr, bool noisy)
214 {
215         return true;
216 }
217
218 bool LocalUser::HasPrivPermission(const std::string &privstr, bool noisy)
219 {
220         if (!this->IsOper())
221         {
222                 if (noisy)
223                         this->WriteNotice("You are not an oper");
224                 return false;
225         }
226
227         if (oper->AllowedPrivs.find(privstr) != oper->AllowedPrivs.end())
228         {
229                 return true;
230         }
231         else if (oper->AllowedPrivs.find("*") != oper->AllowedPrivs.end())
232         {
233                 return true;
234         }
235
236         if (noisy)
237                 this->WriteNotice("Oper type " + oper->name + " does not have access to priv " + privstr);
238
239         return false;
240 }
241
242 void UserIOHandler::OnDataReady()
243 {
244         if (user->quitting)
245                 return;
246
247         if (recvq.length() > user->MyClass->GetRecvqMax() && !user->HasPrivPermission("users/flood/increased-buffers"))
248         {
249                 ServerInstance->Users->QuitUser(user, "RecvQ exceeded");
250                 ServerInstance->SNO->WriteToSnoMask('a', "User %s RecvQ of %lu exceeds connect class maximum of %lu",
251                         user->nick.c_str(), (unsigned long)recvq.length(), user->MyClass->GetRecvqMax());
252                 return;
253         }
254         unsigned long sendqmax = ULONG_MAX;
255         if (!user->HasPrivPermission("users/flood/increased-buffers"))
256                 sendqmax = user->MyClass->GetSendqSoftMax();
257         unsigned long penaltymax = ULONG_MAX;
258         if (!user->HasPrivPermission("users/flood/no-fakelag"))
259                 penaltymax = user->MyClass->GetPenaltyThreshold() * 1000;
260
261         while (user->CommandFloodPenalty < penaltymax && getSendQSize() < sendqmax)
262         {
263                 std::string line;
264                 line.reserve(ServerInstance->Config->Limits.MaxLine);
265                 std::string::size_type qpos = 0;
266                 while (qpos < recvq.length())
267                 {
268                         char c = recvq[qpos++];
269                         switch (c)
270                         {
271                         case '\0':
272                                 c = ' ';
273                                 break;
274                         case '\r':
275                                 continue;
276                         case '\n':
277                                 goto eol_found;
278                         }
279                         if (line.length() < ServerInstance->Config->Limits.MaxLine - 2)
280                                 line.push_back(c);
281                 }
282                 // if we got here, the recvq ran out before we found a newline
283                 return;
284 eol_found:
285                 // just found a newline. Terminate the string, and pull it out of recvq
286                 recvq = recvq.substr(qpos);
287
288                 // TODO should this be moved to when it was inserted in recvq?
289                 ServerInstance->stats->statsRecv += qpos;
290                 user->bytes_in += qpos;
291                 user->cmds_in++;
292
293                 ServerInstance->Parser->ProcessBuffer(line, user);
294                 if (user->quitting)
295                         return;
296         }
297         if (user->CommandFloodPenalty >= penaltymax && !user->MyClass->fakelag)
298                 ServerInstance->Users->QuitUser(user, "Excess Flood");
299 }
300
301 void UserIOHandler::AddWriteBuf(const std::string &data)
302 {
303         if (user->quitting_sendq)
304                 return;
305         if (!user->quitting && getSendQSize() + data.length() > user->MyClass->GetSendqHardMax() &&
306                 !user->HasPrivPermission("users/flood/increased-buffers"))
307         {
308                 user->quitting_sendq = true;
309                 ServerInstance->GlobalCulls.AddSQItem(user);
310                 return;
311         }
312
313         // We still want to append data to the sendq of a quitting user,
314         // e.g. their ERROR message that says 'closing link'
315
316         WriteData(data);
317 }
318
319 void UserIOHandler::OnError(BufferedSocketError)
320 {
321         ServerInstance->Users->QuitUser(user, getError());
322 }
323
324 CullResult User::cull()
325 {
326         if (!quitting)
327                 ServerInstance->Users->QuitUser(this, "Culled without QuitUser");
328
329         if (client_sa.sa.sa_family != AF_UNSPEC)
330                 ServerInstance->Users->RemoveCloneCounts(this);
331
332         return Extensible::cull();
333 }
334
335 CullResult LocalUser::cull()
336 {
337         ServerInstance->Users->local_users.erase(this);
338         ClearInvites();
339         eh.cull();
340         return User::cull();
341 }
342
343 CullResult FakeUser::cull()
344 {
345         // Fake users don't quit, they just get culled.
346         quitting = true;
347         // Fake users are not inserted into UserManager::clientlist, they're only in the uuidlist
348         ServerInstance->Users->uuidlist->erase(uuid);
349         return User::cull();
350 }
351
352 void User::Oper(OperInfo* info)
353 {
354         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
355         if (this->IsModeSet(opermh))
356                 this->UnOper();
357
358         this->SetMode(opermh, true);
359         this->oper = info;
360         this->WriteCommand("MODE", "+o");
361         FOREACH_MOD(OnOper, (this, info->name));
362
363         std::string opername;
364         if (info->oper_block)
365                 opername = info->oper_block->getString("name");
366
367         if (IS_LOCAL(this))
368         {
369                 LocalUser* l = IS_LOCAL(this);
370                 std::string vhost = oper->getConfig("vhost");
371                 if (!vhost.empty())
372                         l->ChangeDisplayedHost(vhost.c_str());
373                 std::string opClass = oper->getConfig("class");
374                 if (!opClass.empty())
375                         l->SetClass(opClass);
376         }
377
378         ServerInstance->SNO->WriteToSnoMask('o',"%s (%s@%s) is now an IRC operator of type %s (using oper '%s')",
379                 nick.c_str(), ident.c_str(), host.c_str(), oper->name.c_str(), opername.c_str());
380         this->WriteNumeric(RPL_YOUAREOPER, ":You are now %s %s", strchr("aeiouAEIOU", oper->name[0]) ? "an" : "a", oper->name.c_str());
381
382         ServerInstance->Logs->Log("OPER", LOG_DEFAULT, "%s opered as type: %s", GetFullRealHost().c_str(), oper->name.c_str());
383         ServerInstance->Users->all_opers.push_back(this);
384
385         // Expand permissions from config for faster lookup
386         if (IS_LOCAL(this))
387                 oper->init();
388
389         FOREACH_MOD(OnPostOper, (this, oper->name, opername));
390 }
391
392 void OperInfo::init()
393 {
394         AllowedOperCommands.clear();
395         AllowedPrivs.clear();
396         AllowedUserModes.reset();
397         AllowedChanModes.reset();
398         AllowedUserModes['o' - 'A'] = true; // Call me paranoid if you want.
399
400         for(std::vector<reference<ConfigTag> >::iterator iter = class_blocks.begin(); iter != class_blocks.end(); ++iter)
401         {
402                 ConfigTag* tag = *iter;
403                 std::string mycmd, mypriv;
404                 /* Process commands */
405                 irc::spacesepstream CommandList(tag->getString("commands"));
406                 while (CommandList.GetToken(mycmd))
407                 {
408                         AllowedOperCommands.insert(mycmd);
409                 }
410
411                 irc::spacesepstream PrivList(tag->getString("privs"));
412                 while (PrivList.GetToken(mypriv))
413                 {
414                         AllowedPrivs.insert(mypriv);
415                 }
416
417                 std::string modes = tag->getString("usermodes");
418                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
419                 {
420                         if (*c == '*')
421                         {
422                                 this->AllowedUserModes.set();
423                         }
424                         else if (*c >= 'A' && *c < 'z')
425                         {
426                                 this->AllowedUserModes[*c - 'A'] = true;
427                         }
428                 }
429
430                 modes = tag->getString("chanmodes");
431                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
432                 {
433                         if (*c == '*')
434                         {
435                                 this->AllowedChanModes.set();
436                         }
437                         else if (*c >= 'A' && *c < 'z')
438                         {
439                                 this->AllowedChanModes[*c - 'A'] = true;
440                         }
441                 }
442         }
443 }
444
445 void User::UnOper()
446 {
447         if (!this->IsOper())
448                 return;
449
450         /*
451          * unset their oper type (what IS_OPER checks).
452          * note, order is important - this must come before modes as -o attempts
453          * to call UnOper. -- w00t
454          */
455         oper = NULL;
456
457
458         /* Remove all oper only modes from the user when the deoper - Bug #466*/
459         std::string moderemove("-");
460
461         for (unsigned char letter = 'A'; letter <= 'z'; letter++)
462         {
463                 ModeHandler* mh = ServerInstance->Modes->FindMode(letter, MODETYPE_USER);
464                 if (mh && mh->NeedsOper())
465                         moderemove += letter;
466         }
467
468
469         std::vector<std::string> parameters;
470         parameters.push_back(this->nick);
471         parameters.push_back(moderemove);
472
473         ServerInstance->Modes->Process(parameters, this);
474
475         /* remove the user from the oper list. Will remove multiple entries as a safeguard against bug #404 */
476         ServerInstance->Users->all_opers.remove(this);
477
478         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
479         this->SetMode(opermh, false);
480 }
481
482 /*
483  * Check class restrictions
484  */
485 void LocalUser::CheckClass(bool clone_count)
486 {
487         ConnectClass* a = this->MyClass;
488
489         if (!a)
490         {
491                 ServerInstance->Users->QuitUser(this, "Access denied by configuration");
492                 return;
493         }
494         else if (a->type == CC_DENY)
495         {
496                 ServerInstance->Users->QuitUser(this, a->config->getString("reason", "Unauthorised connection"));
497                 return;
498         }
499         else if (clone_count)
500         {
501                 if ((a->GetMaxLocal()) && (ServerInstance->Users->LocalCloneCount(this) > a->GetMaxLocal()))
502                 {
503                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (local)");
504                         if (a->maxconnwarn)
505                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum LOCAL connections (%ld) exceeded for IP %s", a->GetMaxLocal(), this->GetIPString().c_str());
506                         return;
507                 }
508                 else if ((a->GetMaxGlobal()) && (ServerInstance->Users->GlobalCloneCount(this) > a->GetMaxGlobal()))
509                 {
510                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (global)");
511                         if (a->maxconnwarn)
512                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum GLOBAL connections (%ld) exceeded for IP %s", a->GetMaxGlobal(), this->GetIPString().c_str());
513                         return;
514                 }
515         }
516
517         this->nping = ServerInstance->Time() + a->GetPingTime() + ServerInstance->Config->dns_timeout;
518 }
519
520 bool LocalUser::CheckLines(bool doZline)
521 {
522         const char* check[] = { "G" , "K", (doZline) ? "Z" : NULL, NULL };
523
524         if (!this->exempt)
525         {
526                 for (int n = 0; check[n]; ++n)
527                 {
528                         XLine *r = ServerInstance->XLines->MatchesLine(check[n], this);
529
530                         if (r)
531                         {
532                                 r->Apply(this);
533                                 return true;
534                         }
535                 }
536         }
537
538         return false;
539 }
540
541 void LocalUser::FullConnect()
542 {
543         ServerInstance->stats->statsConnects++;
544         this->idle_lastmsg = ServerInstance->Time();
545
546         /*
547          * You may be thinking "wtf, we checked this in User::AddClient!" - and yes, we did, BUT.
548          * At the time AddClient is called, we don't have a resolved host, by here we probably do - which
549          * may put the user into a totally seperate class with different restrictions! so we *must* check again.
550          * Don't remove this! -- w00t
551          */
552         MyClass = NULL;
553         SetClass();
554         CheckClass();
555         CheckLines();
556
557         if (quitting)
558                 return;
559
560         this->WriteNumeric(RPL_WELCOME, ":Welcome to the %s IRC Network %s", ServerInstance->Config->Network.c_str(), GetFullRealHost().c_str());
561         this->WriteNumeric(RPL_YOURHOSTIS, ":Your host is %s, running version %s", ServerInstance->Config->ServerName.c_str(), BRANCH);
562         this->WriteNumeric(RPL_SERVERCREATED, ":This server was created %s %s", __TIME__, __DATE__);
563
564         const std::string& modelist = ServerInstance->Modes->GetModeListFor004Numeric();
565         this->WriteNumeric(RPL_SERVERVERSION, "%s %s %s", ServerInstance->Config->ServerName.c_str(), BRANCH, modelist.c_str());
566
567         ServerInstance->ISupport.SendTo(this);
568
569         /* Now registered */
570         if (ServerInstance->Users->unregistered_count)
571                 ServerInstance->Users->unregistered_count--;
572
573         /* Trigger MOTD and LUSERS output, give modules a chance too */
574         ModResult MOD_RESULT;
575         std::string command("LUSERS");
576         std::vector<std::string> parameters;
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         MOD_RESULT = MOD_RES_PASSTHRU;
582         command = "MOTD";
583         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, parameters, this, true, command));
584         if (!MOD_RESULT)
585                 ServerInstance->Parser->CallHandler(command, parameters, this);
586
587         if (ServerInstance->Config->RawLog)
588                 WriteServ("PRIVMSG %s :*** Raw I/O logging is enabled on this server. All messages, passwords, and commands are being recorded.", nick.c_str());
589
590         /*
591          * We don't set REG_ALL until triggering OnUserConnect, so some module events don't spew out stuff
592          * for a user that doesn't exist yet.
593          */
594         FOREACH_MOD(OnUserConnect, (this));
595
596         this->registered = REG_ALL;
597
598         FOREACH_MOD(OnPostConnect, (this));
599
600         ServerInstance->SNO->WriteToSnoMask('c',"Client connecting on port %d (class %s): %s (%s) [%s]",
601                 this->GetServerPort(), this->MyClass->name.c_str(), GetFullRealHost().c_str(), this->GetIPString().c_str(), this->fullname.c_str());
602         ServerInstance->Logs->Log("BANCACHE", LOG_DEBUG, "BanCache: Adding NEGATIVE hit for " + this->GetIPString());
603         ServerInstance->BanCache->AddHit(this->GetIPString(), "", "");
604         // reset the flood penalty (which could have been raised due to things like auto +x)
605         CommandFloodPenalty = 0;
606 }
607
608 void User::InvalidateCache()
609 {
610         /* Invalidate cache */
611         cached_fullhost.clear();
612         cached_hostip.clear();
613         cached_makehost.clear();
614         cached_fullrealhost.clear();
615 }
616
617 bool User::ChangeNick(const std::string& newnick, bool force)
618 {
619         if (quitting)
620         {
621                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "ERROR: Attempted to change nick of a quitting user: " + this->nick);
622                 return false;
623         }
624
625         if (!force)
626         {
627                 ModResult MOD_RESULT;
628                 FIRST_MOD_RESULT(OnUserPreNick, MOD_RESULT, (this, newnick));
629
630                 if (MOD_RESULT == MOD_RES_DENY)
631                 {
632                         ServerInstance->stats->statsCollisions++;
633                         return false;
634                 }
635         }
636
637         if (assign(newnick) == assign(nick))
638         {
639                 // case change, don't need to check Q:lines and such
640                 // and, if it's identical including case, we can leave right now
641                 if (newnick == nick)
642                         return true;
643         }
644         else
645         {
646                 /*
647                  * Don't check Q:Lines if it's a server-enforced change, just on the off-chance some fucking *moron*
648                  * tries to Q:Line SIDs, also, this means we just get our way period, as it really should be.
649                  * Thanks Kein for finding this. -- w00t
650                  *
651                  * Also don't check Q:Lines for remote nickchanges, they should have our Q:Lines anyway to enforce themselves.
652                  *              -- w00t
653                  */
654                 if (IS_LOCAL(this) && !force)
655                 {
656                         XLine* mq = ServerInstance->XLines->MatchesLine("Q",newnick);
657                         if (mq)
658                         {
659                                 if (this->registered == REG_ALL)
660                                 {
661                                         ServerInstance->SNO->WriteGlobalSno('a', "Q-Lined nickname %s from %s: %s",
662                                                 newnick.c_str(), GetFullRealHost().c_str(), mq->reason.c_str());
663                                 }
664                                 this->WriteNumeric(ERR_ERRONEUSNICKNAME, "%s :Invalid nickname: %s", newnick.c_str(), mq->reason.c_str());
665                                 return false;
666                         }
667
668                         if (ServerInstance->Config->RestrictBannedUsers)
669                         {
670                                 for (UCListIter i = this->chans.begin(); i != this->chans.end(); i++)
671                                 {
672                                         Channel* chan = (*i)->chan;
673                                         if (chan->GetPrefixValue(this) < VOICE_VALUE && chan->IsBanned(this))
674                                         {
675                                                 this->WriteNumeric(ERR_CANNOTSENDTOCHAN, "%s :Cannot send to channel (you're banned)", chan->name.c_str());
676                                                 return false;
677                                         }
678                                 }
679                         }
680                 }
681
682                 /*
683                  * Uh oh.. if the nickname is in use, and it's not in use by the person using it (doh) --
684                  * then we have a potential collide. Check whether someone else is camping on the nick
685                  * (i.e. connect -> send NICK, don't send USER.) If they are camping, force-change the
686                  * camper to their UID, and allow the incoming nick change.
687                  *
688                  * If the guy using the nick is already using it, tell the incoming nick change to gtfo,
689                  * because the nick is already (rightfully) in use. -- w00t
690                  */
691                 User* InUse = ServerInstance->FindNickOnly(newnick);
692                 if (InUse && (InUse != this))
693                 {
694                         if (InUse->registered != REG_ALL)
695                         {
696                                 /* force the camper to their UUID, and ask them to re-send a NICK. */
697                                 InUse->WriteTo(InUse, "NICK %s", InUse->uuid.c_str());
698                                 InUse->WriteNumeric(ERR_NICKNAMEINUSE, "%s :Nickname overruled.", InUse->nick.c_str());
699
700                                 ServerInstance->Users->clientlist->erase(InUse->nick);
701                                 (*(ServerInstance->Users->clientlist))[InUse->uuid] = InUse;
702
703                                 InUse->nick = InUse->uuid;
704                                 InUse->InvalidateCache();
705                                 InUse->registered &= ~REG_NICK;
706                         }
707                         else
708                         {
709                                 /* No camping, tell the incoming user  to stop trying to change nick ;p */
710                                 this->WriteNumeric(ERR_NICKNAMEINUSE, "%s :Nickname is already in use.", newnick.c_str());
711                                 return false;
712                         }
713                 }
714         }
715
716         if (this->registered == REG_ALL)
717                 this->WriteCommon("NICK %s",newnick.c_str());
718         std::string oldnick = nick;
719         nick = newnick;
720
721         InvalidateCache();
722         ServerInstance->Users->clientlist->erase(oldnick);
723         (*(ServerInstance->Users->clientlist))[newnick] = this;
724
725         if (registered == REG_ALL)
726                 FOREACH_MOD(OnUserPostNick, (this,oldnick));
727
728         return true;
729 }
730
731 int LocalUser::GetServerPort()
732 {
733         switch (this->server_sa.sa.sa_family)
734         {
735                 case AF_INET6:
736                         return htons(this->server_sa.in6.sin6_port);
737                 case AF_INET:
738                         return htons(this->server_sa.in4.sin_port);
739         }
740         return 0;
741 }
742
743 const std::string& User::GetIPString()
744 {
745         int port;
746         if (cachedip.empty())
747         {
748                 irc::sockets::satoap(client_sa, cachedip, port);
749                 /* IP addresses starting with a : on irc are a Bad Thing (tm) */
750                 if (cachedip[0] == ':')
751                         cachedip.insert(cachedip.begin(),1,'0');
752         }
753
754         return cachedip;
755 }
756
757 irc::sockets::cidr_mask User::GetCIDRMask()
758 {
759         int range = 0;
760         switch (client_sa.sa.sa_family)
761         {
762                 case AF_INET6:
763                         range = ServerInstance->Config->c_ipv6_range;
764                         break;
765                 case AF_INET:
766                         range = ServerInstance->Config->c_ipv4_range;
767                         break;
768         }
769         return irc::sockets::cidr_mask(client_sa, range);
770 }
771
772 bool User::SetClientIP(const char* sip, bool recheck_eline)
773 {
774         cachedip.clear();
775         cached_hostip.clear();
776         return irc::sockets::aptosa(sip, 0, client_sa);
777 }
778
779 void User::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
780 {
781         cachedip.clear();
782         cached_hostip.clear();
783         memcpy(&client_sa, &sa, sizeof(irc::sockets::sockaddrs));
784 }
785
786 bool LocalUser::SetClientIP(const char* sip, bool recheck_eline)
787 {
788         irc::sockets::sockaddrs sa;
789         if (!irc::sockets::aptosa(sip, 0, sa))
790                 // Invalid
791                 return false;
792
793         LocalUser::SetClientIP(sa, recheck_eline);
794         return true;
795 }
796
797 void LocalUser::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
798 {
799         if (sa != client_sa)
800         {
801                 User::SetClientIP(sa);
802                 if (recheck_eline)
803                         this->exempt = (ServerInstance->XLines->MatchesLine("E", this) != NULL);
804
805                 FOREACH_MOD(OnSetUserIP, (this));
806         }
807 }
808
809 static std::string wide_newline("\r\n");
810
811 void User::Write(const std::string& text)
812 {
813 }
814
815 void User::Write(const char *text, ...)
816 {
817 }
818
819 void LocalUser::Write(const std::string& text)
820 {
821         if (!ServerInstance->SE->BoundsCheckFd(&eh))
822                 return;
823
824         if (text.length() > ServerInstance->Config->Limits.MaxLine - 2)
825         {
826                 // this should happen rarely or never. Crop the string at 512 and try again.
827                 std::string try_again = text.substr(0, ServerInstance->Config->Limits.MaxLine - 2);
828                 Write(try_again);
829                 return;
830         }
831
832         ServerInstance->Logs->Log("USEROUTPUT", LOG_RAWIO, "C[%s] O %s", uuid.c_str(), text.c_str());
833
834         eh.AddWriteBuf(text);
835         eh.AddWriteBuf(wide_newline);
836
837         ServerInstance->stats->statsSent += text.length() + 2;
838         this->bytes_out += text.length() + 2;
839         this->cmds_out++;
840 }
841
842 /** Write()
843  */
844 void LocalUser::Write(const char *text, ...)
845 {
846         std::string textbuffer;
847         VAFORMAT(textbuffer, text, text);
848         this->Write(textbuffer);
849 }
850
851 void User::WriteServ(const std::string& text)
852 {
853         this->Write(":%s %s",ServerInstance->Config->ServerName.c_str(),text.c_str());
854 }
855
856 /** WriteServ()
857  *  Same as Write(), except `text' is prefixed with `:server.name '.
858  */
859 void User::WriteServ(const char* text, ...)
860 {
861         std::string textbuffer;
862         VAFORMAT(textbuffer, text, text);
863         this->WriteServ(textbuffer);
864 }
865
866 void User::WriteCommand(const char* command, const std::string& text)
867 {
868         this->WriteServ(command + (this->registered & REG_NICK ? " " + this->nick : " *") + " " + text);
869 }
870
871 void User::WriteNumeric(unsigned int numeric, const char* text, ...)
872 {
873         std::string textbuffer;
874         VAFORMAT(textbuffer, text, text);
875         this->WriteNumeric(numeric, textbuffer);
876 }
877
878 void User::WriteNumeric(unsigned int numeric, const std::string &text)
879 {
880         ModResult MOD_RESULT;
881
882         FIRST_MOD_RESULT(OnNumeric, MOD_RESULT, (this, numeric, text));
883
884         if (MOD_RESULT == MOD_RES_DENY)
885                 return;
886
887         const std::string message = InspIRCd::Format(":%s %03u %s %s", ServerInstance->Config->ServerName.c_str(),
888                 numeric, this->registered & REG_NICK ? this->nick.c_str() : "*", text.c_str());
889         this->Write(message);
890 }
891
892 void User::WriteFrom(User *user, const std::string &text)
893 {
894         const std::string message = ":" + user->GetFullHost() + " " + text;
895         this->Write(message);
896 }
897
898
899 /* write text from an originating user to originating user */
900
901 void User::WriteFrom(User *user, const char* text, ...)
902 {
903         std::string textbuffer;
904         VAFORMAT(textbuffer, text, text);
905         this->WriteFrom(user, textbuffer);
906 }
907
908
909 /* write text to an destination user from a source user (e.g. user privmsg) */
910
911 void User::WriteTo(User *dest, const char *data, ...)
912 {
913         std::string textbuffer;
914         VAFORMAT(textbuffer, data, data);
915         this->WriteTo(dest, textbuffer);
916 }
917
918 void User::WriteTo(User *dest, const std::string &data)
919 {
920         dest->WriteFrom(this, data);
921 }
922
923 void User::WriteCommon(const char* text, ...)
924 {
925         if (this->registered != REG_ALL || quitting)
926                 return;
927
928         std::string textbuffer;
929         VAFORMAT(textbuffer, text, text);
930         textbuffer = ":" + this->GetFullHost() + " " + textbuffer;
931         this->WriteCommonRaw(textbuffer, true);
932 }
933
934 void User::WriteCommonExcept(const char* text, ...)
935 {
936         if (this->registered != REG_ALL || quitting)
937                 return;
938
939         std::string textbuffer;
940         VAFORMAT(textbuffer, text, text);
941         textbuffer = ":" + this->GetFullHost() + " " + textbuffer;
942         this->WriteCommonRaw(textbuffer, false);
943 }
944
945 void User::WriteCommonRaw(const std::string &line, bool include_self)
946 {
947         if (this->registered != REG_ALL || quitting)
948                 return;
949
950         LocalUser::already_sent_id++;
951
952         IncludeChanList include_c(chans.begin(), chans.end());
953         std::map<User*,bool> exceptions;
954
955         exceptions[this] = include_self;
956
957         FOREACH_MOD(OnBuildNeighborList, (this, include_c, exceptions));
958
959         for (std::map<User*,bool>::iterator i = exceptions.begin(); i != exceptions.end(); ++i)
960         {
961                 LocalUser* u = IS_LOCAL(i->first);
962                 if (u && !u->quitting)
963                 {
964                         u->already_sent = LocalUser::already_sent_id;
965                         if (i->second)
966                                 u->Write(line);
967                 }
968         }
969         for (IncludeChanList::const_iterator v = include_c.begin(); v != include_c.end(); ++v)
970         {
971                 Channel* c = (*v)->chan;
972                 const UserMembList* ulist = c->GetUsers();
973                 for (UserMembList::const_iterator i = ulist->begin(); i != ulist->end(); i++)
974                 {
975                         LocalUser* u = IS_LOCAL(i->first);
976                         if (u && u->already_sent != LocalUser::already_sent_id)
977                         {
978                                 u->already_sent = LocalUser::already_sent_id;
979                                 u->Write(line);
980                         }
981                 }
982         }
983 }
984
985 void User::WriteCommonQuit(const std::string &normal_text, const std::string &oper_text)
986 {
987         if (this->registered != REG_ALL)
988                 return;
989
990         already_sent_t uniq_id = ++LocalUser::already_sent_id;
991
992         const std::string normalMessage = ":" + this->GetFullHost() + " QUIT :" + normal_text;
993         const std::string operMessage = ":" + this->GetFullHost() + " QUIT :" + oper_text;
994
995         IncludeChanList include_c(chans.begin(), chans.end());
996         std::map<User*,bool> exceptions;
997
998         FOREACH_MOD(OnBuildNeighborList, (this, include_c, exceptions));
999
1000         for (std::map<User*,bool>::iterator i = exceptions.begin(); i != exceptions.end(); ++i)
1001         {
1002                 LocalUser* u = IS_LOCAL(i->first);
1003                 if (u && !u->quitting)
1004                 {
1005                         u->already_sent = uniq_id;
1006                         if (i->second)
1007                                 u->Write(u->IsOper() ? operMessage : normalMessage);
1008                 }
1009         }
1010         for (IncludeChanList::const_iterator v = include_c.begin(); v != include_c.end(); ++v)
1011         {
1012                 const UserMembList* ulist = (*v)->chan->GetUsers();
1013                 for (UserMembList::const_iterator i = ulist->begin(); i != ulist->end(); i++)
1014                 {
1015                         LocalUser* u = IS_LOCAL(i->first);
1016                         if (u && (u->already_sent != uniq_id))
1017                         {
1018                                 u->already_sent = uniq_id;
1019                                 u->Write(u->IsOper() ? operMessage : normalMessage);
1020                         }
1021                 }
1022         }
1023 }
1024
1025 void LocalUser::SendText(const std::string& line)
1026 {
1027         Write(line);
1028 }
1029
1030 void RemoteUser::SendText(const std::string& line)
1031 {
1032         ServerInstance->PI->PushToClient(this, line);
1033 }
1034
1035 void FakeUser::SendText(const std::string& line)
1036 {
1037 }
1038
1039 void User::SendText(const char *text, ...)
1040 {
1041         std::string line;
1042         VAFORMAT(line, text, text);
1043         SendText(line);
1044 }
1045
1046 void User::SendText(const std::string& linePrefix, std::stringstream& textStream)
1047 {
1048         std::string line;
1049         std::string word;
1050         while (textStream >> word)
1051         {
1052                 size_t lineLength = linePrefix.length() + line.length() + word.length() + 3; // "\s\n\r"
1053                 if (lineLength > ServerInstance->Config->Limits.MaxLine)
1054                 {
1055                         SendText(linePrefix + line);
1056                         line.clear();
1057                 }
1058                 line += " " + word;
1059         }
1060         SendText(linePrefix + line);
1061 }
1062
1063 /* return 0 or 1 depending if users u and u2 share one or more common channels
1064  * (used by QUIT, NICK etc which arent channel specific notices)
1065  *
1066  * The old algorithm in 1.0 for this was relatively inefficient, iterating over
1067  * the first users channels then the second users channels within the outer loop,
1068  * therefore it was a maximum of x*y iterations (upon returning 0 and checking
1069  * all possible iterations). However this new function instead checks against the
1070  * channel's userlist in the inner loop which is a std::map<User*,User*>
1071  * and saves us time as we already know what pointer value we are after.
1072  * Don't quote me on the maths as i am not a mathematician or computer scientist,
1073  * but i believe this algorithm is now x+(log y) maximum iterations instead.
1074  */
1075 bool User::SharesChannelWith(User *other)
1076 {
1077         if ((this->registered != REG_ALL) || (other->registered != REG_ALL))
1078                 return false;
1079
1080         /* Outer loop */
1081         for (UCListIter i = this->chans.begin(); i != this->chans.end(); i++)
1082         {
1083                 /* Eliminate the inner loop (which used to be ~equal in size to the outer loop)
1084                  * by replacing it with a map::find which *should* be more efficient
1085                  */
1086                 if ((*i)->chan->HasUser(other))
1087                         return true;
1088         }
1089         return false;
1090 }
1091
1092 bool User::ChangeName(const std::string& gecos)
1093 {
1094         if (!this->fullname.compare(gecos))
1095                 return true;
1096
1097         if (IS_LOCAL(this))
1098         {
1099                 ModResult MOD_RESULT;
1100                 FIRST_MOD_RESULT(OnChangeLocalUserGECOS, MOD_RESULT, (IS_LOCAL(this),gecos));
1101                 if (MOD_RESULT == MOD_RES_DENY)
1102                         return false;
1103                 FOREACH_MOD(OnChangeName, (this,gecos));
1104         }
1105         this->fullname.assign(gecos, 0, ServerInstance->Config->Limits.MaxGecos);
1106
1107         return true;
1108 }
1109
1110 bool User::ChangeDisplayedHost(const std::string& shost)
1111 {
1112         if (dhost == shost)
1113                 return true;
1114
1115         if (IS_LOCAL(this))
1116         {
1117                 ModResult MOD_RESULT;
1118                 FIRST_MOD_RESULT(OnChangeLocalUserHost, MOD_RESULT, (IS_LOCAL(this),shost));
1119                 if (MOD_RESULT == MOD_RES_DENY)
1120                         return false;
1121         }
1122
1123         FOREACH_MOD(OnChangeHost, (this,shost));
1124
1125         this->dhost.assign(shost, 0, 64);
1126         this->InvalidateCache();
1127
1128         if (IS_LOCAL(this))
1129                 this->WriteNumeric(RPL_YOURDISPLAYEDHOST, "%s :is now your displayed host", this->dhost.c_str());
1130
1131         return true;
1132 }
1133
1134 bool User::ChangeIdent(const std::string& newident)
1135 {
1136         if (this->ident == newident)
1137                 return true;
1138
1139         FOREACH_MOD(OnChangeIdent, (this,newident));
1140
1141         this->ident.assign(newident, 0, ServerInstance->Config->Limits.IdentMax);
1142         this->InvalidateCache();
1143
1144         return true;
1145 }
1146
1147 void User::SendAll(const char* command, const char* text, ...)
1148 {
1149         std::string textbuffer;
1150         VAFORMAT(textbuffer, text, text);
1151         const std::string message = ":" + this->GetFullHost() + " " + command + " $* :" + textbuffer;
1152
1153         for (LocalUserList::const_iterator i = ServerInstance->Users->local_users.begin(); i != ServerInstance->Users->local_users.end(); i++)
1154         {
1155                 if ((*i)->registered == REG_ALL)
1156                         (*i)->Write(message);
1157         }
1158 }
1159
1160 /*
1161  * Sets a user's connection class.
1162  * If the class name is provided, it will be used. Otherwise, the class will be guessed using host/ip/ident/etc.
1163  * NOTE: If the <ALLOW> or <DENY> tag specifies an ip, and this user resolves,
1164  * then their ip will be taken as 'priority' anyway, so for example,
1165  * <connect allow="127.0.0.1"> will match joe!bloggs@localhost
1166  */
1167 void LocalUser::SetClass(const std::string &explicit_name)
1168 {
1169         ConnectClass *found = NULL;
1170
1171         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Setting connect class for UID %s", this->uuid.c_str());
1172
1173         if (!explicit_name.empty())
1174         {
1175                 for (ClassVector::iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); i++)
1176                 {
1177                         ConnectClass* c = *i;
1178
1179                         if (explicit_name == c->name)
1180                         {
1181                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Explicitly set to %s", explicit_name.c_str());
1182                                 found = c;
1183                         }
1184                 }
1185         }
1186         else
1187         {
1188                 for (ClassVector::iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); i++)
1189                 {
1190                         ConnectClass* c = *i;
1191                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Checking %s", c->GetName().c_str());
1192
1193                         ModResult MOD_RESULT;
1194                         FIRST_MOD_RESULT(OnSetConnectClass, MOD_RESULT, (this,c));
1195                         if (MOD_RESULT == MOD_RES_DENY)
1196                                 continue;
1197                         if (MOD_RESULT == MOD_RES_ALLOW)
1198                         {
1199                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Class forced by module to %s", c->GetName().c_str());
1200                                 found = c;
1201                                 break;
1202                         }
1203
1204                         if (c->type == CC_NAMED)
1205                                 continue;
1206
1207                         bool regdone = (registered != REG_NONE);
1208                         if (c->config->getBool("registered", regdone) != regdone)
1209                                 continue;
1210
1211                         /* check if host matches.. */
1212                         if (!InspIRCd::MatchCIDR(this->GetIPString(), c->GetHost(), NULL) &&
1213                             !InspIRCd::MatchCIDR(this->host, c->GetHost(), NULL))
1214                         {
1215                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "No host match (for %s)", c->GetHost().c_str());
1216                                 continue;
1217                         }
1218
1219                         /*
1220                          * deny change if change will take class over the limit check it HERE, not after we found a matching class,
1221                          * because we should attempt to find another class if this one doesn't match us. -- w00t
1222                          */
1223                         if (c->limit && (c->GetReferenceCount() >= c->limit))
1224                         {
1225                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "OOPS: Connect class limit (%lu) hit, denying", c->limit);
1226                                 continue;
1227                         }
1228
1229                         /* if it requires a port ... */
1230                         int port = c->config->getInt("port");
1231                         if (port)
1232                         {
1233                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Requires port (%d)", port);
1234
1235                                 /* and our port doesn't match, fail. */
1236                                 if (this->GetServerPort() != port)
1237                                         continue;
1238                         }
1239
1240                         if (regdone && !c->config->getString("password").empty())
1241                         {
1242                                 if (!ServerInstance->PassCompare(this, c->config->getString("password"), password, c->config->getString("hash")))
1243                                 {
1244                                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Bad password, skipping");
1245                                         continue;
1246                                 }
1247                         }
1248
1249                         /* we stop at the first class that meets ALL critera. */
1250                         found = c;
1251                         break;
1252                 }
1253         }
1254
1255         /*
1256          * Okay, assuming we found a class that matches.. switch us into that class, keeping refcounts up to date.
1257          */
1258         if (found)
1259         {
1260                 MyClass = found;
1261         }
1262 }
1263
1264 void User::PurgeEmptyChannels()
1265 {
1266         // firstly decrement the count on each channel
1267         for (UCListIter i = this->chans.begin(); i != this->chans.end(); )
1268         {
1269                 Channel* c = (*i)->chan;
1270                 ++i;
1271                 c->DelUser(this);
1272         }
1273
1274         this->UnOper();
1275 }
1276
1277 const std::string& FakeUser::GetFullHost()
1278 {
1279         if (!ServerInstance->Config->HideWhoisServer.empty())
1280                 return ServerInstance->Config->HideWhoisServer;
1281         return server->GetName();
1282 }
1283
1284 const std::string& FakeUser::GetFullRealHost()
1285 {
1286         if (!ServerInstance->Config->HideWhoisServer.empty())
1287                 return ServerInstance->Config->HideWhoisServer;
1288         return server->GetName();
1289 }
1290
1291 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask)
1292         : config(tag), type(t), fakelag(true), name("unnamed"), registration_timeout(0), host(mask),
1293         pingtime(0), softsendqmax(0), hardsendqmax(0), recvqmax(0),
1294         penaltythreshold(0), commandrate(0), maxlocal(0), maxglobal(0), maxconnwarn(true), maxchans(0),
1295         limit(0), resolvehostnames(true)
1296 {
1297 }
1298
1299 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask, const ConnectClass& parent)
1300         : config(tag), type(t), fakelag(parent.fakelag), name("unnamed"),
1301         registration_timeout(parent.registration_timeout), host(mask), pingtime(parent.pingtime),
1302         softsendqmax(parent.softsendqmax), hardsendqmax(parent.hardsendqmax), recvqmax(parent.recvqmax),
1303         penaltythreshold(parent.penaltythreshold), commandrate(parent.commandrate),
1304         maxlocal(parent.maxlocal), maxglobal(parent.maxglobal), maxconnwarn(parent.maxconnwarn), maxchans(parent.maxchans),
1305         limit(parent.limit), resolvehostnames(parent.resolvehostnames)
1306 {
1307 }
1308
1309 void ConnectClass::Update(const ConnectClass* src)
1310 {
1311         config = src->config;
1312         type = src->type;
1313         fakelag = src->fakelag;
1314         name = src->name;
1315         registration_timeout = src->registration_timeout;
1316         host = src->host;
1317         pingtime = src->pingtime;
1318         softsendqmax = src->softsendqmax;
1319         hardsendqmax = src->hardsendqmax;
1320         recvqmax = src->recvqmax;
1321         penaltythreshold = src->penaltythreshold;
1322         commandrate = src->commandrate;
1323         maxlocal = src->maxlocal;
1324         maxglobal = src->maxglobal;
1325         maxconnwarn = src->maxconnwarn;
1326         maxchans = src->maxchans;
1327         limit = src->limit;
1328         resolvehostnames = src->resolvehostnames;
1329 }