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1 /*       +------------------------------------+
2  *       | Inspire Internet Relay Chat Daemon |
3  *       +------------------------------------+
4  *
5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
6  * See: http://wiki.inspircd.org/Credits
7  *
8  * This program is free but copyrighted software; see
9  *            the file COPYING for details.
10  *
11  * ---------------------------------------------------
12  */
13
14 /* $Core */
15
16 #include "inspircd.h"
17 #include <cstdarg>
18 #include "mode.h"
19
20 Channel::Channel(InspIRCd* Instance, const std::string &cname, time_t ts)
21 {
22         chan_hash::iterator findchan = ServerInstance->chanlist->find(cname);
23         if (findchan != Instance->chanlist->end())
24                 throw CoreException("Cannot create duplicate channel " + cname);
25
26         (*(ServerInstance->chanlist))[cname.c_str()] = this;
27         this->name.assign(cname, 0, ServerInstance->Config->Limits.ChanMax);
28         this->age = ts ? ts : ServerInstance->Time();
29
30         maxbans = topicset = 0;
31         modes.reset();
32 }
33
34 void Channel::SetMode(char mode,bool mode_on)
35 {
36         modes[mode-65] = mode_on;
37 }
38
39 void Channel::SetModeParam(char mode, std::string parameter)
40 {
41         CustomModeList::iterator n = custom_mode_params.find(mode);
42         // always erase, even if changing, so that the map gets the new value
43         if (n != custom_mode_params.end())
44                 custom_mode_params.erase(n);
45         if (parameter.empty())
46         {
47                 modes[mode-65] = false;
48         }
49         else
50         {
51                 custom_mode_params[mode] = parameter;
52                 modes[mode-65] = true;
53         }
54 }
55
56 std::string Channel::GetModeParameter(char mode)
57 {
58         CustomModeList::iterator n = custom_mode_params.find(mode);
59         if (n != custom_mode_params.end())
60                 return n->second;
61         return "";
62 }
63
64 int Channel::SetTopic(User *u, std::string &ntopic, bool forceset)
65 {
66         if (u)
67         {
68                 if(!forceset)
69                 {
70                         ModResult res;
71                         /* 0: check status, 1: don't, -1: disallow change silently */
72
73                         FIRST_MOD_RESULT(ServerInstance, OnPreTopicChange, res, (u,this,ntopic));
74
75                         if (res == MOD_RES_DENY)
76                                 return CMD_FAILURE;
77                         if (res != MOD_RES_ALLOW)
78                         {
79                                 if (!this->HasUser(u))
80                                 {
81                                         u->WriteNumeric(442, "%s %s :You're not on that channel!",u->nick.c_str(), this->name.c_str());
82                                         return CMD_FAILURE;
83                                 }
84                                 if ((this->IsModeSet('t')) && (this->GetPrefixValue(u) < HALFOP_VALUE))
85                                 {
86                                         u->WriteNumeric(482, "%s %s :You must be at least a half-operator to change the topic on this channel", u->nick.c_str(), this->name.c_str());
87                                         return CMD_FAILURE;
88                                 }
89                         }
90                 }
91         }
92
93         this->topic.assign(ntopic, 0, ServerInstance->Config->Limits.MaxTopic);
94         if (u)
95         {
96                 this->setby.assign(ServerInstance->Config->FullHostInTopic ? u->GetFullHost() : u->nick, 0, 128);
97                 this->WriteChannel(u, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
98         }
99         else
100         {
101                 this->setby.assign(ServerInstance->Config->ServerName);
102                 this->WriteChannelWithServ(ServerInstance->Config->ServerName, "TOPIC %s :%s", this->name.c_str(), this->topic.c_str());
103         }
104
105         this->topicset = ServerInstance->Time();
106
107         // XXX: this check for 'u' is probably pre-fake-user, and it fucking sucks anyway. we need to change this.
108         if (u)
109         {
110                 FOREACH_MOD(I_OnPostTopicChange,OnPostTopicChange(u, this, this->topic));
111         }
112
113         return CMD_SUCCESS;
114 }
115
116 long Channel::GetUserCounter()
117 {
118         return userlist.size();
119 }
120
121 Membership* Channel::AddUser(User* user)
122 {
123         Membership* memb = new Membership(user, this);
124         userlist[user] = memb;
125         return memb;
126 }
127
128 unsigned long Channel::DelUser(User* user)
129 {
130         UserMembIter a = userlist.find(user);
131
132         if (a != userlist.end())
133         {
134                 delete a->second;
135                 userlist.erase(a);
136         }
137
138         return userlist.size();
139 }
140
141 bool Channel::HasUser(User* user)
142 {
143         return (userlist.find(user) != userlist.end());
144 }
145
146 Membership* Channel::GetUser(User* user)
147 {
148         UserMembIter i = userlist.find(user);
149         if (i == userlist.end())
150                 return NULL;
151         return i->second;
152 }
153
154 const UserMembList* Channel::GetUsers()
155 {
156         return &userlist;
157 }
158
159 void Channel::SetDefaultModes()
160 {
161         ServerInstance->Logs->Log("CHANNELS", DEBUG, "SetDefaultModes %s", ServerInstance->Config->DefaultModes);
162         irc::spacesepstream list(ServerInstance->Config->DefaultModes);
163         std::string modeseq;
164         std::string parameter;
165
166         list.GetToken(modeseq);
167
168         for (std::string::iterator n = modeseq.begin(); n != modeseq.end(); ++n)
169         {
170                 ModeHandler* mode = ServerInstance->Modes->FindMode(*n, MODETYPE_CHANNEL);
171                 if (mode)
172                 {
173                         if (mode->GetNumParams(true))
174                                 list.GetToken(parameter);
175                         else
176                                 parameter.clear();
177
178                         mode->OnModeChange(ServerInstance->FakeClient, ServerInstance->FakeClient, this, parameter, true);
179                 }
180         }
181 }
182
183 /*
184  * add a channel to a user, creating the record for it if needed and linking
185  * it to the user record
186  */
187 Channel* Channel::JoinUser(InspIRCd* Instance, User *user, const char* cn, bool override, const char* key, bool bursting, time_t TS)
188 {
189         // Fix: unregistered users could be joined using /SAJOIN
190         if (!user || !cn || user->registered != REG_ALL)
191                 return NULL;
192
193         char cname[MAXBUF];
194         std::string privs;
195         Channel *Ptr;
196
197         /*
198          * We don't restrict the number of channels that remote users or users that are override-joining may be in.
199          * We restrict local users to MaxChans channels.
200          * We restrict local operators to OperMaxChans channels.
201          * This is a lot more logical than how it was formerly. -- w00t
202          */
203         if (IS_LOCAL(user) && !override)
204         {
205                 // Checking MyClass exists because we *may* get here with NULL, not 100% sure.
206                 if (user->MyClass && user->MyClass->maxchans)
207                 {
208                         if (user->HasPrivPermission("channels/high-join-limit"))
209                         {
210                                 if (user->chans.size() >= Instance->Config->OperMaxChans)
211                                 {
212                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
213                                         return NULL;
214                                 }
215                         }
216                         else
217                         {
218                                 if (user->chans.size() >= user->MyClass->maxchans)
219                                 {
220                                         user->WriteNumeric(ERR_TOOMANYCHANNELS, "%s %s :You are on too many channels",user->nick.c_str(), cn);
221                                         return NULL;
222                                 }
223                         }
224                 }
225         }
226
227         strlcpy(cname, cn, Instance->Config->Limits.ChanMax);
228         Ptr = Instance->FindChan(cname);
229         bool created_by_local = false;
230
231         if (!Ptr)
232         {
233                 /*
234                  * Fix: desync bug was here, don't set @ on remote users - spanningtree handles their permissions. bug #358. -- w00t
235                  */
236                 if (!IS_LOCAL(user))
237                 {
238                         if (!TS)
239                                 Instance->Logs->Log("CHANNEL",DEBUG,"*** BUG *** Channel::JoinUser called for REMOTE user '%s' on channel '%s' but no TS given!", user->nick.c_str(), cn);
240                 }
241                 else
242                 {
243                         privs = "o";
244                         created_by_local = true;
245                 }
246
247                 if (IS_LOCAL(user) && override == false)
248                 {
249                         ModResult MOD_RESULT;
250                         FIRST_MOD_RESULT(Instance, OnUserPreJoin, MOD_RESULT, (user, NULL, cname, privs, key ? key : ""));
251                         if (MOD_RESULT == MOD_RES_DENY)
252                                 return NULL;
253                 }
254
255                 Ptr = new Channel(Instance, cname, TS);
256         }
257         else
258         {
259                 /* Already on the channel */
260                 if (Ptr->HasUser(user))
261                         return NULL;
262
263                 /*
264                  * remote users are allowed us to bypass channel modes
265                  * and bans (used by servers)
266                  */
267                 if (IS_LOCAL(user) && override == false)
268                 {
269                         ModResult MOD_RESULT;
270                         FIRST_MOD_RESULT(Instance, OnUserPreJoin, MOD_RESULT, (user, Ptr, cname, privs, key ? key : ""));
271                         if (MOD_RESULT == MOD_RES_DENY)
272                         {
273                                 return NULL;
274                         }
275                         else if (MOD_RESULT == MOD_RES_PASSTHRU)
276                         {
277                                 std::string ckey = Ptr->GetModeParameter('k');
278                                 bool invited = user->IsInvited(Ptr->name.c_str());
279                                 bool can_bypass = Instance->Config->InvBypassModes && invited;
280
281                                 if (!ckey.empty())
282                                 {
283                                         FIRST_MOD_RESULT(Instance, OnCheckKey, MOD_RESULT, (user, Ptr, key ? key : ""));
284                                         if (!MOD_RESULT.check((key && ckey == key) || can_bypass))
285                                         {
286                                                 // If no key provided, or key is not the right one, and can't bypass +k (not invited or option not enabled)
287                                                 user->WriteNumeric(ERR_BADCHANNELKEY, "%s %s :Cannot join channel (Incorrect channel key)",user->nick.c_str(), Ptr->name.c_str());
288                                                 return NULL;
289                                         }
290                                 }
291
292                                 if (Ptr->IsModeSet('i'))
293                                 {
294                                         FIRST_MOD_RESULT(Instance, OnCheckInvite, MOD_RESULT, (user, Ptr));
295                                         if (!MOD_RESULT.check(invited))
296                                         {
297                                                 user->WriteNumeric(ERR_INVITEONLYCHAN, "%s %s :Cannot join channel (Invite only)",user->nick.c_str(), Ptr->name.c_str());
298                                                 return NULL;
299                                         }
300                                 }
301
302                                 std::string limit = Ptr->GetModeParameter('l');
303                                 if (!limit.empty())
304                                 {
305                                         FIRST_MOD_RESULT(Instance, OnCheckLimit, MOD_RESULT, (user, Ptr));
306                                         if (!MOD_RESULT.check((Ptr->GetUserCounter() < atol(limit.c_str()) || can_bypass)))
307                                         {
308                                                 user->WriteNumeric(ERR_CHANNELISFULL, "%s %s :Cannot join channel (Channel is full)",user->nick.c_str(), Ptr->name.c_str());
309                                                 return NULL;
310                                         }
311                                 }
312
313                                 if (Ptr->IsBanned(user) && !can_bypass)
314                                 {
315                                         user->WriteNumeric(ERR_BANNEDFROMCHAN, "%s %s :Cannot join channel (You're banned)",user->nick.c_str(), Ptr->name.c_str());
316                                         return NULL;
317                                 }
318
319                                 /*
320                                  * If the user has invites for this channel, remove them now
321                                  * after a successful join so they don't build up.
322                                  */
323                                 if (invited)
324                                 {
325                                         user->RemoveInvite(Ptr->name.c_str());
326                                 }
327                         }
328                 }
329         }
330
331         if (created_by_local)
332         {
333                 /* As spotted by jilles, dont bother to set this on remote users */
334                 Ptr->SetDefaultModes();
335         }
336
337         return Channel::ForceChan(Instance, Ptr, user, privs, bursting, created_by_local);
338 }
339
340 Channel* Channel::ForceChan(InspIRCd* Instance, Channel* Ptr, User* user, const std::string &privs, bool bursting, bool created)
341 {
342         std::string nick = user->nick;
343
344         Membership* memb = Ptr->AddUser(user);
345         user->chans.insert(Ptr);
346
347         for (std::string::const_iterator x = privs.begin(); x != privs.end(); x++)
348         {
349                 const char status = *x;
350                 ModeHandler* mh = Instance->Modes->FindMode(status, MODETYPE_CHANNEL);
351                 if (mh)
352                 {
353                         /* Set, and make sure that the mode handler knows this mode was now set */
354                         Ptr->SetPrefix(user, mh->GetModeChar(), true);
355                         mh->OnModeChange(Instance->FakeClient, Instance->FakeClient, Ptr, nick, true);
356                 }
357         }
358
359         CUList except_list;
360         FOREACH_MOD_I(Instance,I_OnUserJoin,OnUserJoin(memb, bursting, created, except_list));
361
362         Ptr->WriteAllExcept(user, false, 0, except_list, "JOIN :%s", Ptr->name.c_str());
363
364         /* Theyre not the first ones in here, make sure everyone else sees the modes we gave the user */
365         std::string ms = Instance->Modes->ModeString(user, Ptr);
366         if ((Ptr->GetUserCounter() > 1) && (ms.length()))
367                 Ptr->WriteAllExceptSender(user, true, 0, "MODE %s +%s", Ptr->name.c_str(), ms.c_str());
368
369         /* Major improvement by Brain - we dont need to be calculating all this pointlessly for remote users */
370         if (IS_LOCAL(user))
371         {
372                 if (Ptr->topicset)
373                 {
374                         user->WriteNumeric(RPL_TOPIC, "%s %s :%s", user->nick.c_str(), Ptr->name.c_str(), Ptr->topic.c_str());
375                         user->WriteNumeric(RPL_TOPICTIME, "%s %s %s %lu", user->nick.c_str(), Ptr->name.c_str(), Ptr->setby.c_str(), (unsigned long)Ptr->topicset);
376                 }
377                 Ptr->UserList(user);
378         }
379         FOREACH_MOD_I(Instance,I_OnPostJoin,OnPostJoin(memb));
380         return Ptr;
381 }
382
383 bool Channel::IsBanned(User* user)
384 {
385         ModResult result;
386         FIRST_MOD_RESULT(ServerInstance, OnCheckChannelBan, result, (user, this));
387
388         if (result != MOD_RES_PASSTHRU)
389                 return (result == MOD_RES_DENY);
390
391         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
392         {
393                 if (CheckBan(user, i->data))
394                         return true;
395         }
396         return false;
397 }
398
399 bool Channel::CheckBan(User* user, const std::string& mask)
400 {
401         ModResult result;
402         FIRST_MOD_RESULT(ServerInstance, OnCheckBan, result, (user, this, mask));
403         if (result != MOD_RES_PASSTHRU)
404                 return (result == MOD_RES_DENY);
405
406         // extbans were handled above, if this is one it obviously didn't match
407         if (mask[1] == ':')
408                 return false;
409
410         std::string::size_type at = mask.find('@');
411         if (at == std::string::npos)
412                 return false;
413
414         char tomatch[MAXBUF];
415         snprintf(tomatch, MAXBUF, "%s!%s", user->nick.c_str(), user->ident.c_str());
416         std::string prefix = mask.substr(0, at);
417         if (InspIRCd::Match(tomatch, prefix, NULL))
418         {
419                 std::string suffix = mask.substr(at + 1);
420                 if (InspIRCd::Match(user->host, suffix, NULL) ||
421                         InspIRCd::Match(user->dhost, suffix, NULL) ||
422                         InspIRCd::MatchCIDR(user->GetIPString(), suffix, NULL))
423                         return true;
424         }
425         return false;
426 }
427
428 ModResult Channel::GetExtBanStatus(User *user, char type)
429 {
430         ModResult rv;
431         FIRST_MOD_RESULT(ServerInstance, OnExtBanCheck, rv, (user, this, type));
432         if (rv != MOD_RES_PASSTHRU)
433                 return rv;
434         for (BanList::iterator i = this->bans.begin(); i != this->bans.end(); i++)
435         {
436                 if (i->data[0] == type && i->data[1] == ':')
437                 {
438                         std::string val = i->data.substr(2);
439                         if (CheckBan(user, val))
440                                 return MOD_RES_DENY;
441                 }
442         }
443         return MOD_RES_ALLOW;
444 }
445
446 /* Channel::PartUser
447  * remove a channel from a users record, and return the number of users left.
448  * Therefore, if this function returns 0 the caller should delete the Channel.
449  */
450 long Channel::PartUser(User *user, std::string &reason)
451 {
452         if (!user)
453                 return this->GetUserCounter();
454
455         Membership* memb = GetUser(user);
456
457         if (memb)
458         {
459                 CUList except_list;
460                 FOREACH_MOD(I_OnUserPart,OnUserPart(memb, reason, except_list));
461
462                 WriteAllExcept(user, false, 0, except_list, "PART %s%s%s", this->name.c_str(), reason.empty() ? "" : " :", reason.c_str());
463
464                 user->chans.erase(this);
465                 this->RemoveAllPrefixes(user);
466         }
467
468         if (!this->DelUser(user)) /* if there are no users left on the channel... */
469         {
470                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name);
471                 /* kill the record */
472                 if (iter != ServerInstance->chanlist->end())
473                 {
474                         ModResult res;
475                         FIRST_MOD_RESULT(ServerInstance, OnChannelPreDelete, res, (this));
476                         if (res == MOD_RES_DENY)
477                                 return 1; // delete halted by module
478                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
479                         ServerInstance->chanlist->erase(iter);
480                 }
481                 return 0;
482         }
483
484         return this->GetUserCounter();
485 }
486
487 long Channel::ServerKickUser(User* user, const char* reason, const char* servername)
488 {
489         if (servername == NULL || *ServerInstance->Config->HideWhoisServer)
490                 servername = ServerInstance->Config->ServerName;
491
492         ServerInstance->FakeClient->server = servername;
493         return this->KickUser(ServerInstance->FakeClient, user, reason);
494 }
495
496 long Channel::KickUser(User *src, User *user, const char* reason)
497 {
498         if (!src || !user || !reason)
499                 return this->GetUserCounter();
500
501         Membership* memb = GetUser(user);
502         if (IS_LOCAL(src))
503         {
504                 if (!memb)
505                 {
506                         src->WriteNumeric(ERR_USERNOTINCHANNEL, "%s %s %s :They are not on that channel",src->nick.c_str(), user->nick.c_str(), this->name.c_str());
507                         return this->GetUserCounter();
508                 }
509                 if ((ServerInstance->ULine(user->server)) && (!ServerInstance->ULine(src->server)))
510                 {
511                         src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :Only a u-line may kick a u-line from a channel.",src->nick.c_str(), this->name.c_str());
512                         return this->GetUserCounter();
513                 }
514
515                 ModResult res;
516                 if (ServerInstance->ULine(src->server))
517                         res = MOD_RES_ALLOW;
518                 else
519                         FIRST_MOD_RESULT(ServerInstance, OnUserPreKick, res, (src,memb,reason));
520
521                 if (res == MOD_RES_DENY)
522                         return this->GetUserCounter();
523
524                 if (res == MOD_RES_PASSTHRU)
525                 {
526                         int them = this->GetPrefixValue(src);
527                         int us = this->GetPrefixValue(user);
528                         if ((them < HALFOP_VALUE) || (them < us))
529                         {
530                                 src->WriteNumeric(ERR_CHANOPRIVSNEEDED, "%s %s :You must be a channel %soperator",src->nick.c_str(), this->name.c_str(), them >= HALFOP_VALUE ? "" : "half-");
531                                 return this->GetUserCounter();
532                         }
533                 }
534         }
535
536         if (memb)
537         {
538                 CUList except_list;
539                 FOREACH_MOD(I_OnUserKick,OnUserKick(src, memb, reason, except_list));
540
541                 WriteAllExcept(src, false, 0, except_list, "KICK %s %s :%s", name.c_str(), user->nick.c_str(), reason);
542
543                 user->chans.erase(this);
544                 this->RemoveAllPrefixes(user);
545         }
546
547         if (!this->DelUser(user))
548         /* if there are no users left on the channel */
549         {
550                 chan_hash::iterator iter = ServerInstance->chanlist->find(this->name.c_str());
551
552                 /* kill the record */
553                 if (iter != ServerInstance->chanlist->end())
554                 {
555                         ModResult res;
556                         FIRST_MOD_RESULT(ServerInstance, OnChannelPreDelete, res, (this));
557                         if (res == MOD_RES_DENY)
558                                 return 1; // delete halted by module
559                         FOREACH_MOD(I_OnChannelDelete, OnChannelDelete(this));
560                         ServerInstance->chanlist->erase(iter);
561                 }
562                 return 0;
563         }
564
565         return this->GetUserCounter();
566 }
567
568 void Channel::WriteChannel(User* user, const char* text, ...)
569 {
570         char textbuffer[MAXBUF];
571         va_list argsPtr;
572
573         if (!user || !text)
574                 return;
575
576         va_start(argsPtr, text);
577         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
578         va_end(argsPtr);
579
580         this->WriteChannel(user, std::string(textbuffer));
581 }
582
583 void Channel::WriteChannel(User* user, const std::string &text)
584 {
585         char tb[MAXBUF];
586
587         if (!user)
588                 return;
589
590         snprintf(tb,MAXBUF,":%s %s", user->GetFullHost().c_str(), text.c_str());
591         std::string out = tb;
592
593         for (UserMembIter i = userlist.begin(); i != userlist.end(); i++)
594         {
595                 if (IS_LOCAL(i->first))
596                         i->first->Write(out);
597         }
598 }
599
600 void Channel::WriteChannelWithServ(const char* ServName, const char* text, ...)
601 {
602         char textbuffer[MAXBUF];
603         va_list argsPtr;
604
605         if (!text)
606                 return;
607
608         va_start(argsPtr, text);
609         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
610         va_end(argsPtr);
611
612         this->WriteChannelWithServ(ServName, std::string(textbuffer));
613 }
614
615 void Channel::WriteChannelWithServ(const char* ServName, const std::string &text)
616 {
617         char tb[MAXBUF];
618
619         snprintf(tb,MAXBUF,":%s %s", ServName ? ServName : ServerInstance->Config->ServerName, text.c_str());
620         std::string out = tb;
621
622         for (UserMembIter i = userlist.begin(); i != userlist.end(); i++)
623         {
624                 if (IS_LOCAL(i->first))
625                         i->first->Write(out);
626         }
627 }
628
629 /* write formatted text from a source user to all users on a channel except
630  * for the sender (for privmsg etc) */
631 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const char* text, ...)
632 {
633         char textbuffer[MAXBUF];
634         va_list argsPtr;
635
636         if (!text)
637                 return;
638
639         va_start(argsPtr, text);
640         vsnprintf(textbuffer, MAXBUF, text, argsPtr);
641         va_end(argsPtr);
642
643         this->WriteAllExceptSender(user, serversource, status, std::string(textbuffer));
644 }
645
646 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const char* text, ...)
647 {
648         char textbuffer[MAXBUF];
649         va_list argsPtr;
650
651         if (!text)
652                 return;
653
654         int offset = snprintf(textbuffer,MAXBUF,":%s ", user->GetFullHost().c_str());
655
656         va_start(argsPtr, text);
657         vsnprintf(textbuffer + offset, MAXBUF - offset, text, argsPtr);
658         va_end(argsPtr);
659
660         this->RawWriteAllExcept(user, serversource, status, except_list, std::string(textbuffer));
661 }
662
663 void Channel::WriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &text)
664 {
665         char tb[MAXBUF];
666
667         snprintf(tb,MAXBUF,":%s %s", serversource ? ServerInstance->Config->ServerName : user->GetFullHost().c_str(), text.c_str());
668         std::string out = tb;
669
670         this->RawWriteAllExcept(user, serversource, status, except_list, std::string(tb));
671 }
672
673 void Channel::RawWriteAllExcept(User* user, bool serversource, char status, CUList &except_list, const std::string &out)
674 {
675         char statmode = 0;
676         if (status)
677         {
678                 ModeHandler* mh = ServerInstance->Modes->FindPrefix(status);
679                 if (mh)
680                         statmode = mh->GetModeChar();
681         }
682         for (UserMembIter i = userlist.begin(); i != userlist.end(); i++)
683         {
684                 if ((IS_LOCAL(i->first)) && (except_list.find(i->first) == except_list.end()))
685                 {
686                         /* User doesnt have the status we're after */
687                         if (statmode && !i->second->hasMode(statmode))
688                                 continue;
689
690                         i->first->Write(out);
691                 }
692         }
693 }
694
695 void Channel::WriteAllExceptSender(User* user, bool serversource, char status, const std::string& text)
696 {
697         CUList except_list;
698         except_list.insert(user);
699         this->WriteAllExcept(user, serversource, status, except_list, std::string(text));
700 }
701
702 /*
703  * return a count of the users on a specific channel accounting for
704  * invisible users who won't increase the count. e.g. for /LIST
705  */
706 int Channel::CountInvisible()
707 {
708         int count = 0;
709         for (UserMembIter i = userlist.begin(); i != userlist.end(); i++)
710         {
711                 if (!(i->first->IsModeSet('i')))
712                         count++;
713         }
714
715         return count;
716 }
717
718 char* Channel::ChanModes(bool showkey)
719 {
720         static char scratch[MAXBUF];
721         static char sparam[MAXBUF];
722         char* offset = scratch;
723         std::string extparam;
724
725         *scratch = '\0';
726         *sparam = '\0';
727
728         /* This was still iterating up to 190, Channel::modes is only 64 elements -- Om */
729         for(int n = 0; n < 64; n++)
730         {
731                 if(this->modes[n])
732                 {
733                         *offset++ = n + 65;
734                         extparam.clear();
735                         switch (n)
736                         {
737                                 case CM_KEY:
738                                         // Unfortunately this must be special-cased, as we definitely don't want to always display key.
739                                         if (showkey)
740                                         {
741                                                 extparam = this->GetModeParameter('k');
742                                         }
743                                         else
744                                         {
745                                                 extparam = "<key>";
746                                         }
747                                         break;
748                                 case CM_NOEXTERNAL:
749                                 case CM_TOPICLOCK:
750                                 case CM_INVITEONLY:
751                                 case CM_MODERATED:
752                                 case CM_SECRET:
753                                 case CM_PRIVATE:
754                                         /* We know these have no parameters */
755                                 break;
756                                 default:
757                                         extparam = this->GetModeParameter(n + 65);
758                                 break;
759                         }
760                         if (!extparam.empty())
761                         {
762                                 charlcat(sparam,' ',MAXBUF);
763                                 strlcat(sparam,extparam.c_str(),MAXBUF);
764                         }
765                 }
766         }
767
768         /* Null terminate scratch */
769         *offset = '\0';
770         strlcat(scratch,sparam,MAXBUF);
771         return scratch;
772 }
773
774 /* compile a userlist of a channel into a string, each nick seperated by
775  * spaces and op, voice etc status shown as @ and +, and send it to 'user'
776  */
777 void Channel::UserList(User *user)
778 {
779         char list[MAXBUF];
780         size_t dlen, curlen;
781         ModResult call_modules;
782
783         if (!IS_LOCAL(user))
784                 return;
785
786         FIRST_MOD_RESULT(ServerInstance, OnUserList, call_modules, (user, this));
787
788         if (call_modules != MOD_RES_ALLOW)
789         {
790                 if ((this->IsModeSet('s')) && (!this->HasUser(user)))
791                 {
792                         user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel",user->nick.c_str(), this->name.c_str());
793                         return;
794                 }
795         }
796
797         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=',  this->name.c_str());
798
799         int numusers = 0;
800         char* ptr = list + dlen;
801
802         /* Improvement by Brain - this doesnt change in value, so why was it inside
803          * the loop?
804          */
805         bool has_user = this->HasUser(user);
806
807         for (UserMembIter i = userlist.begin(); i != userlist.end(); i++)
808         {
809                 if ((!has_user) && (i->first->IsModeSet('i')))
810                 {
811                         /*
812                          * user is +i, and source not on the channel, does not show
813                          * nick in NAMES list
814                          */
815                         continue;
816                 }
817
818                 std::string prefixlist = this->GetPrefixChar(i->first);
819                 std::string nick = i->first->nick;
820
821                 if (call_modules != MOD_RES_DENY)
822                 {
823                         FOREACH_MOD(I_OnNamesListItem, OnNamesListItem(user, i->second, prefixlist, nick));
824
825                         /* Nick was nuked, a module wants us to skip it */
826                         if (nick.empty())
827                                 continue;
828                 }
829
830                 size_t ptrlen = 0;
831
832                 if (curlen + prefixlist.length() + nick.length() + 1 > 480)
833                 {
834                         /* list overflowed into multiple numerics */
835                         user->WriteNumeric(RPL_NAMREPLY, std::string(list));
836
837                         /* reset our lengths */
838                         dlen = curlen = snprintf(list,MAXBUF,"%s %c %s :", user->nick.c_str(), this->IsModeSet('s') ? '@' : this->IsModeSet('p') ? '*' : '=', this->name.c_str());
839                         ptr = list + dlen;
840
841                         ptrlen = 0;
842                         numusers = 0;
843                 }
844
845                 ptrlen = snprintf(ptr, MAXBUF, "%s%s ", prefixlist.c_str(), nick.c_str());
846
847                 curlen += ptrlen;
848                 ptr += ptrlen;
849
850                 numusers++;
851         }
852
853         /* if whats left in the list isnt empty, send it */
854         if (numusers)
855         {
856                 user->WriteNumeric(RPL_NAMREPLY, std::string(list));
857         }
858
859         user->WriteNumeric(RPL_ENDOFNAMES, "%s %s :End of /NAMES list.", user->nick.c_str(), this->name.c_str());
860 }
861
862 long Channel::GetMaxBans()
863 {
864         /* Return the cached value if there is one */
865         if (this->maxbans)
866                 return this->maxbans;
867
868         /* If there isnt one, we have to do some O(n) hax to find it the first time. (ick) */
869         for (std::map<std::string,int>::iterator n = ServerInstance->Config->maxbans.begin(); n != ServerInstance->Config->maxbans.end(); n++)
870         {
871                 if (InspIRCd::Match(this->name, n->first, NULL))
872                 {
873                         this->maxbans = n->second;
874                         return n->second;
875                 }
876         }
877
878         /* Screw it, just return the default of 64 */
879         this->maxbans = 64;
880         return this->maxbans;
881 }
882
883 void Channel::ResetMaxBans()
884 {
885         this->maxbans = 0;
886 }
887
888 /* returns the status character for a given user on a channel, e.g. @ for op,
889  * % for halfop etc. If the user has several modes set, the highest mode
890  * the user has must be returned.
891  */
892 const char* Channel::GetPrefixChar(User *user)
893 {
894         static char pf[2] = {0, 0};
895         *pf = 0;
896         unsigned int bestrank = 0;
897
898         UserMembIter m = userlist.find(user);
899         if (m != userlist.end())
900         {
901                 for(unsigned int i=0; i < m->second->modes.length(); i++)
902                 {
903                         char mchar = m->second->modes[i];
904                         ModeHandler* mh = ServerInstance->Modes->FindMode(mchar, MODETYPE_CHANNEL);
905                         if (mh && mh->GetPrefixRank() > bestrank && mh->GetPrefix())
906                         {
907                                 bestrank = mh->GetPrefixRank();
908                                 pf[0] = mh->GetPrefix();
909                         }
910                 }
911         }
912         return pf;
913 }
914
915 unsigned int Membership::getRank()
916 {
917         char mchar = modes.c_str()[0];
918         unsigned int rv = 0;
919         if (mchar)
920         {
921                 ModeHandler* mh = ServerInstance->Modes->FindMode(mchar, MODETYPE_CHANNEL);
922                 if (mh)
923                         rv = mh->GetPrefixRank();
924         }
925         return rv;
926 }
927
928 const char* Channel::GetAllPrefixChars(User* user)
929 {
930         static char prefix[64];
931         int ctr = 0;
932
933         UserMembIter m = userlist.find(user);
934         if (m != userlist.end())
935         {
936                 for(unsigned int i=0; i < m->second->modes.length(); i++)
937                 {
938                         char mchar = m->second->modes[i];
939                         ModeHandler* mh = ServerInstance->Modes->FindMode(mchar, MODETYPE_CHANNEL);
940                         if (mh && mh->GetPrefix())
941                                 prefix[ctr++] = mh->GetPrefix();
942                 }
943         }
944         prefix[ctr] = 0;
945
946         return prefix;
947 }
948
949 unsigned int Channel::GetPrefixValue(User* user)
950 {
951         UserMembIter m = userlist.find(user);
952         if (m == userlist.end())
953                 return 0;
954         return m->second->getRank();
955 }
956
957 void Channel::SetPrefix(User* user, char prefix, bool adding)
958 {
959         ModeHandler* delta_mh = ServerInstance->Modes->FindMode(prefix, MODETYPE_CHANNEL);
960         if (!delta_mh)
961                 return;
962         UserMembIter m = userlist.find(user);
963         if (m == userlist.end())
964                 return;
965         for(unsigned int i=0; i < m->second->modes.length(); i++)
966         {
967                 char mchar = m->second->modes[i];
968                 ModeHandler* mh = ServerInstance->Modes->FindMode(mchar, MODETYPE_CHANNEL);
969                 if (mh && mh->GetPrefixRank() <= delta_mh->GetPrefixRank())
970                 {
971                         m->second->modes =
972                                 m->second->modes.substr(0,i) +
973                                 (adding ? std::string(1, prefix) : "") +
974                                 m->second->modes.substr(mchar == prefix ? i+1 : i);
975                         return;
976                 }
977         }
978         if (adding)
979                 m->second->modes += std::string(1, prefix);
980 }
981
982 void Channel::RemoveAllPrefixes(User* user)
983 {
984         UserMembIter m = userlist.find(user);
985         if (m != userlist.end())
986         {
987                 m->second->modes.clear();
988         }
989 }