1 /*
2  * ngIRCd -- The Next Generation IRC Daemon
3  * Copyright (c)2001-2005 by Alexander Barton (alex@barton.de)
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  * Please read the file COPYING, README and AUTHORS for more information.
10  *
11  * Channel management
12  */
13 
14 
15 #define __channel_c__
16 
17 
18 #include "portab.h"
19 
20 static char UNUSED id[] = "$Id: channel.c,v 1.48 2005/06/04 11:53:25 fw Exp $";
21 
22 #include "imp.h"
23 #include <assert.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <strings.h>
27 
28 #include "defines.h"
29 #include "conn-func.h"
30 #include "client.h"
31 
32 #include "exp.h"
33 #include "channel.h"
34 
35 #include "imp.h"
36 #include "irc-write.h"
37 #include "resolve.h"
38 #include "conf.h"
39 #include "hash.h"
40 #include "lists.h"
41 #include "log.h"
42 #include "messages.h"
43 
44 #include "exp.h"
45 
46 
47 #define REMOVE_PART 0
48 #define REMOVE_QUIT 1
49 #define REMOVE_KICK 2
50 
51 
52 LOCAL CHANNEL *My_Channels;
53 LOCAL CL2CHAN *My_Cl2Chan;
54 
55 
56 LOCAL CL2CHAN *Get_Cl2Chan PARAMS(( CHANNEL *Chan, CLIENT *Client ));
57 LOCAL CL2CHAN *Add_Client PARAMS(( CHANNEL *Chan, CLIENT *Client ));
58 LOCAL bool Remove_Client PARAMS(( int Type, CHANNEL *Chan, CLIENT *Client, CLIENT *Origin, char *Reason, bool InformServer ));
59 LOCAL CL2CHAN *Get_First_Cl2Chan PARAMS(( CLIENT *Client, CHANNEL *Chan ));
60 LOCAL CL2CHAN *Get_Next_Cl2Chan PARAMS(( CL2CHAN *Start, CLIENT *Client, CHANNEL *Chan ));
61 LOCAL bool Delete_Channel PARAMS(( CHANNEL *Chan ));
62 
63 
64 GLOBAL void
65 Channel_Init( void )
66 {
67 	My_Channels = NULL;
68 	My_Cl2Chan = NULL;
69 } /* Channel_Init */
70 
71 
72 GLOBAL void
73 Channel_InitPredefined( void )
74 {
75 	/* Vordefinierte persistente Channels erzeugen */
76 
77 	CHANNEL *chan;
78 	char *c;
79 	int i;
80 	
81 	for( i = 0; i < Conf_Channel_Count; i++ )
82 	{
83 		/* Ist ein Name konfiguriert? */
84 		if( ! Conf_Channel[i].name[0] ) continue;
85 
86 		/* Gueltiger Channel-Name? */
87 		if( ! Channel_IsValidName( Conf_Channel[i].name ))
88 		{
89 			Log( LOG_ERR, "Can't create pre-defined channel: invalid name: \"%s\"!", Conf_Channel[i].name );
90 			continue;
91 		}
92 
93 		/* Gibt es den Channel bereits? */
94 		chan = Channel_Search( Conf_Channel[i].name );
95 		if( chan )
96 		{
97 			Log( LOG_INFO, "Can't create pre-defined channel \"%s\": name already in use.", Conf_Channel[i].name );
98 			continue;
99 		}
100 		
101 		/* Channel anlegen */
102 		chan = Channel_Create( Conf_Channel[i].name );
103 		if( chan )
104 		{
105 			Channel_ModeAdd( chan, 'P' );
106 			Channel_SetTopic( chan, Conf_Channel[i].topic );
107 			c = Conf_Channel[i].modes;
108 			while( *c ) Channel_ModeAdd( chan, *c++ );
109 			Log( LOG_INFO, "Created pre-defined channel \"%s\".", Conf_Channel[i].name );
110 		}
111 		else Log( LOG_ERR, "Can't create pre-defined channel \"%s\"!", Conf_Channel[i].name );
112 	}
113 } /* Channel_InitPredefined */
114 
115 
116 GLOBAL void
117 Channel_Exit( void )
118 {
119 	CHANNEL *c, *c_next;
120 	CL2CHAN *cl2chan, *cl2chan_next;
121 	
122 	/* Channel-Strukturen freigeben */
123 	c = My_Channels;
124 	while( c )
125 	{
126 		c_next = c->next;
127 		free( c );
128 		c = c_next;
129 	}
130 
131 	/* Channel-Zuordnungstabelle freigeben */
132 	cl2chan = My_Cl2Chan;
133 	while( c )
134 	{
135 		cl2chan_next = cl2chan->next;
136 		free( cl2chan );
137 		cl2chan = cl2chan_next;
138 	}
139 } /* Channel_Exit */
140 
141 
142 GLOBAL bool
143 Channel_Join( CLIENT *Client, char *Name )
144 {
145 	CHANNEL *chan;
146 	
147 	assert( Client != NULL );
148 	assert( Name != NULL );
149 
150 	/* Valider Channel-Name? */
151 	if( ! Channel_IsValidName( Name ))
152 	{
153 		IRC_WriteStrClient( Client, ERR_NOSUCHCHANNEL_MSG, Client_ID( Client ), Name );
154 		return false;
155 	}
156 
157 	/* Channel suchen */
158 	chan = Channel_Search( Name );
159 	if( chan )
160 	{
161 		/* Ist der Client bereits Mitglied? */
162 		if( Get_Cl2Chan( chan, Client )) return false;
163 	}
164 	else
165 	{
166 		/* Gibt es noch nicht? Dann neu anlegen: */
167 		chan = Channel_Create( Name );
168 		if( ! chan ) return false;
169 	}
170 
171 	/* User dem Channel hinzufuegen */
172 	if( ! Add_Client( chan, Client )) return false;
173 	else return true;
174 } /* Channel_Join */
175 
176 
177 GLOBAL bool
178 Channel_Part( CLIENT *Client, CLIENT *Origin, char *Name, char *Reason )
179 {
180 	CHANNEL *chan;
181 
182 	assert( Client != NULL );
183 	assert( Name != NULL );
184 	assert( Reason != NULL );
185 
186 	/* Channel suchen */
187 	chan = Channel_Search( Name );
188 	if(( ! chan ) || ( ! Get_Cl2Chan( chan, Client )))
189 	{
190 		IRC_WriteStrClient( Client, ERR_NOSUCHCHANNEL_MSG, Client_ID( Client ), Name );
191 		return false;
192 	}
193 
194 	/* User aus Channel entfernen */
195 	if( ! Remove_Client( REMOVE_PART, chan, Client, Origin, Reason, true)) return false;
196 	else return true;
197 } /* Channel_Part */
198 
199 
200 GLOBAL void
201 Channel_Kick( CLIENT *Client, CLIENT *Origin, char *Name, char *Reason )
202 {
203 	CHANNEL *chan;
204 
205 	assert( Client != NULL );
206 	assert( Origin != NULL );
207 	assert( Name != NULL );
208 	assert( Reason != NULL );
209 
210 	/* Channel suchen */
211 	chan = Channel_Search( Name );
212 	if( ! chan )
213 	{
214 		IRC_WriteStrClient( Origin, ERR_NOSUCHCHANNEL_MSG, Client_ID( Origin ), Name );
215 		return;
216 	}
217 
218 	/* Ist der User Mitglied in dem Channel? */
219 	if( ! Channel_IsMemberOf( chan, Origin ))
220 	{
221 		IRC_WriteStrClient( Origin, ERR_NOTONCHANNEL_MSG, Client_ID( Origin ), Name );
222 		return;
223 	}
224 
225 	/* Ist der User Channel-Operator? */
226 	if( ! strchr( Channel_UserModes( chan, Origin ), 'o' ))
227 	{
228 		IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Name);
229 		return;
230 	}
231 
232 	/* Ist der Ziel-User Mitglied im Channel? */
233 	if( ! Channel_IsMemberOf( chan, Client ))
234 	{
235 		IRC_WriteStrClient( Origin, ERR_USERNOTINCHANNEL_MSG, Client_ID( Origin ), Client_ID( Client ), Name );
236 		return;
237 	}
238 
239 	Remove_Client( REMOVE_KICK, chan, Client, Origin, Reason, true);
240 } /* Channel_Kick */
241 
242 
243 GLOBAL void
244 Channel_Quit( CLIENT *Client, char *Reason )
245 {
246 	CHANNEL *c, *next_c;
247 
248 	assert( Client != NULL );
249 	assert( Reason != NULL );
250 
251 	IRC_WriteStrRelatedPrefix( Client, Client, false, "QUIT :%s", Reason );
252 
253 	c = My_Channels;
254 	while( c )
255 	{
256 		next_c = c->next;
257 		Remove_Client( REMOVE_QUIT, c, Client, Client, Reason, false );
258 		c = next_c;
259 	}
260 } /* Channel_Quit */
261 
262 
263 GLOBAL long
264 Channel_Count( void )
265 {
266 	CHANNEL *c;
267 	long count = 0;
268 	
269 	c = My_Channels;
270 	while( c )
271 	{
272 		count++;
273 		c = c->next;
274 	}
275 	return count;
276 } /* Channel_Count */
277 
278 
279 GLOBAL long
280 Channel_MemberCount( CHANNEL *Chan )
281 {
282 	CL2CHAN *cl2chan;
283 	long count = 0;
284 
285 	assert( Chan != NULL );
286 
287 	cl2chan = My_Cl2Chan;
288 	while( cl2chan )
289 	{
290 		if( cl2chan->channel == Chan ) count++;
291 		cl2chan = cl2chan->next;
292 	}
293 	return count;
294 } /* Channel_MemberCount */
295 
296 
297 GLOBAL int
298 Channel_CountForUser( CLIENT *Client )
299 {
300 	/* Count number of channels a user is member of. */
301 
302 	CL2CHAN *cl2chan;
303 	int count = 0;
304 	
305 	assert( Client != NULL );
306 	
307 	cl2chan = My_Cl2Chan;
308 	while( cl2chan )
309 	{
310 		if( cl2chan->client == Client ) count++;
311 		cl2chan = cl2chan->next;
312 	}
313 
314 	return count;
315 } /* Channel_CountForUser */
316 
317 
318 GLOBAL int
319 Channel_PCount( void )
320 {
321 	/* Count the number of persistent (mode 'P') channels */
322 
323 	CHANNEL *chan;
324 	int count = 0;
325 
326 	chan = My_Channels;
327 	while( chan )
328 	{
329 		if( strchr( chan->modes, 'P' )) count++;
330 		chan = chan->next;
331 	}
332 
333 	return count;
334 } /* Channel_PCount */
335 
336 
337 GLOBAL char *
338 Channel_Name( CHANNEL *Chan )
339 {
340 	assert( Chan != NULL );
341 	return Chan->name;
342 } /* Channel_Name */
343 
344 
345 GLOBAL char *
346 Channel_Modes( CHANNEL *Chan )
347 {
348 	assert( Chan != NULL );
349 	return Chan->modes;
350 } /* Channel_Modes */
351 
352 
353 GLOBAL char *
354 Channel_Key( CHANNEL *Chan )
355 {
356 	assert( Chan != NULL );
357 	return Chan->key;
358 } /* Channel_Key */
359 
360 
361 GLOBAL long
362 Channel_MaxUsers( CHANNEL *Chan )
363 {
364 	assert( Chan != NULL );
365 	return Chan->maxusers;
366 } /* Channel_MaxUsers */
367 
368 
369 GLOBAL CHANNEL *
370 Channel_First( void )
371 {
372 	return My_Channels;
373 } /* Channel_First */
374 
375 
376 GLOBAL CHANNEL *
377 Channel_Next( CHANNEL *Chan )
378 {
379 	assert( Chan != NULL );
380 	return Chan->next;
381 } /* Channel_Next */
382 
383 
384 GLOBAL CHANNEL *
385 Channel_Search( char *Name )
386 {
387 	/* Channel-Struktur suchen */
388 	
389 	CHANNEL *c;
390 	UINT32 search_hash;
391 
392 	assert( Name != NULL );
393 
394 	search_hash = Hash( Name );
395 	c = My_Channels;
396 	while( c )
397 	{
398 		if( search_hash == c->hash )
399 		{
400 			/* lt. Hash-Wert: Treffer! */
401 			if( strcasecmp( Name, c->name ) == 0 ) return c;
402 		}
403 		c = c->next;
404 	}
405 	return NULL;
406 } /* Channel_Search */
407 
408 
409 GLOBAL CL2CHAN *
410 Channel_FirstMember( CHANNEL *Chan )
411 {
412 	assert( Chan != NULL );
413 	return Get_First_Cl2Chan( NULL, Chan );
414 } /* Channel_FirstMember */
415 
416 
417 GLOBAL CL2CHAN *
418 Channel_NextMember( CHANNEL *Chan, CL2CHAN *Cl2Chan )
419 {
420 	assert( Chan != NULL );
421 	assert( Cl2Chan != NULL );
422 	return Get_Next_Cl2Chan( Cl2Chan->next, NULL, Chan );
423 } /* Channel_NextMember */
424 
425 
426 GLOBAL CL2CHAN *
427 Channel_FirstChannelOf( CLIENT *Client )
428 {
429 	assert( Client != NULL );
430 	return Get_First_Cl2Chan( Client, NULL );
431 } /* Channel_FirstChannelOf */
432 
433 
434 GLOBAL CL2CHAN *
435 Channel_NextChannelOf( CLIENT *Client, CL2CHAN *Cl2Chan )
436 {
437 	assert( Client != NULL );
438 	assert( Cl2Chan != NULL );
439 	return Get_Next_Cl2Chan( Cl2Chan->next, Client, NULL );
440 } /* Channel_NextChannelOf */
441 
442 
443 GLOBAL CLIENT *
444 Channel_GetClient( CL2CHAN *Cl2Chan )
445 {
446 	assert( Cl2Chan != NULL );
447 	return Cl2Chan->client;
448 } /* Channel_GetClient */
449 
450 
451 GLOBAL CHANNEL *
452 Channel_GetChannel( CL2CHAN *Cl2Chan )
453 {
454 	assert( Cl2Chan != NULL );
455 	return Cl2Chan->channel;
456 } /* Channel_GetChannel */
457 
458 
459 GLOBAL bool
460 Channel_IsValidName( char *Name )
461 {
462 	/* Pruefen, ob Name als Channelname gueltig */
463 
464 	char *ptr, badchars[10];
465 	
466 	assert( Name != NULL );
467 
468 	if(( Name[0] != '#' ) || ( strlen( Name ) >= CHANNEL_NAME_LEN )) return false;
469 
470 	ptr = Name;
471 	strcpy( badchars, " ,:\007" );
472 	while( *ptr )
473 	{
474 		if( strchr( badchars, *ptr )) return false;
475 		ptr++;
476 	}
477 	
478 	return true;
479 } /* Channel_IsValidName */
480 
481 
482 GLOBAL bool
483 Channel_ModeAdd( CHANNEL *Chan, char Mode )
484 {
485 	/* set Mode.
486 	 * If the channel already had this mode, return false.
487 	 * If the channel mode was newly set return true.
488 	 */
489 
490 	char x[2];
491 
492 	assert( Chan != NULL );
493 
494 	x[0] = Mode; x[1] = '\0';
495 	if( ! strchr( Chan->modes, x[0] ))
496 	{
497 		/* Channel does not have this mode yet, set it */
498 		strlcat( Chan->modes, x, sizeof( Chan->modes ));
499 		return true;
500 	}
501 	else return false;
502 } /* Channel_ModeAdd */
503 
504 
505 GLOBAL bool
506 Channel_ModeDel( CHANNEL *Chan, char Mode )
507 {
508 	/* Delete mode.
509 	 * if the mode was removed return true.
510 	 * if the channel did not have the mode, return false.
511 	*/
512 	char x[2], *p;
513 
514 	assert( Chan != NULL );
515 
516 	x[0] = Mode; x[1] = '\0';
517 
518 	p = strchr( Chan->modes, x[0] );
519 	if( ! p ) return false;
520 
521 	/* Channel has mode -> delete */
522 	while( *p )
523 	{
524 		*p = *(p + 1);
525 		p++;
526 	}
527 	return true;
528 } /* Channel_ModeDel */
529 
530 
531 GLOBAL bool
532 Channel_UserModeAdd( CHANNEL *Chan, CLIENT *Client, char Mode )
533 {
534 	/* Set Channel-User-Mode.
535 	 * if mode was newly set, return true.
536 	 * if the User already had this channel-mode, return false.
537 	 */
538 
539 	CL2CHAN *cl2chan;
540 	char x[2];
541 
542 	assert( Chan != NULL );
543 	assert( Client != NULL );
544 
545 	cl2chan = Get_Cl2Chan( Chan, Client );
546 	assert( cl2chan != NULL );
547 	
548 	x[0] = Mode; x[1] = '\0';
549 	if( ! strchr( cl2chan->modes, x[0] ))
550 	{
551 		/* mode not set, -> set it */
552 		strlcat( cl2chan->modes, x, sizeof( cl2chan->modes ));
553 		return true;
554 	}
555 	else return false;
556 } /* Channel_UserModeAdd */
557 
558 
559 GLOBAL bool
560 Channel_UserModeDel( CHANNEL *Chan, CLIENT *Client, char Mode )
561 {
562 	/* Delete Channel-User-Mode.
563 	 * If Mode was removed, return true.
564 	 * If User did not have the Channel-Mode, return false.
565 	 */
566 
567 	CL2CHAN *cl2chan;
568 	char x[2], *p;
569 
570 	assert( Chan != NULL );
571 	assert( Client != NULL );
572 
573 	cl2chan = Get_Cl2Chan( Chan, Client );
574 	assert( cl2chan != NULL );
575 
576 	x[0] = Mode; x[1] = '\0';
577 
578 	p = strchr( cl2chan->modes, x[0] );
579 	if( ! p ) return false;
580 
581 	/* Client has Mode -> delete */
582 	while( *p )
583 	{
584 		*p = *(p + 1);
585 		p++;
586 	}
587 	return true;
588 } /* Channel_UserModeDel */
589 
590 
591 GLOBAL char *
592 Channel_UserModes( CHANNEL *Chan, CLIENT *Client )
593 {
594 	/* return Users' Channel-Modes */
595 	
596 	CL2CHAN *cl2chan;
597 
598 	assert( Chan != NULL );
599 	assert( Client != NULL );
600 
601 	cl2chan = Get_Cl2Chan( Chan, Client );
602 	assert( cl2chan != NULL );
603 
604 	return cl2chan->modes;
605 } /* Channel_UserModes */
606 
607 
608 GLOBAL bool
609 Channel_IsMemberOf( CHANNEL *Chan, CLIENT *Client )
610 {
611 	/* Test if Client is on Channel Chan */
612 
613 	assert( Chan != NULL );
614 	assert( Client != NULL );
615 
616 	if( Get_Cl2Chan( Chan, Client )) return true;
617 	else return false;
618 } /* Channel_IsMemberOf */
619 
620 
621 GLOBAL char *
622 Channel_Topic( CHANNEL *Chan )
623 {
624 	assert( Chan != NULL );
625 	return Chan->topic;
626 } /* Channel_Topic */
627 
628 
629 GLOBAL void
630 Channel_SetTopic( CHANNEL *Chan, char *Topic )
631 {
632 	assert( Chan != NULL );
633 	assert( Topic != NULL );
634 	
635 	strlcpy( Chan->topic, Topic, sizeof( Chan->topic ));
636 } /* Channel_SetTopic */
637 
638 
639 GLOBAL void
640 Channel_SetModes( CHANNEL *Chan, char *Modes )
641 {
642 	assert( Chan != NULL );
643 	assert( Modes != NULL );
644 
645 	strlcpy( Chan->modes, Modes, sizeof( Chan->modes ));
646 } /* Channel_SetModes */
647 
648 
649 GLOBAL void
650 Channel_SetKey( CHANNEL *Chan, char *Key )
651 {
652 	assert( Chan != NULL );
653 	assert( Key != NULL );
654 
655 	strlcpy( Chan->key, Key, sizeof( Chan->key ));
656 	Log( LOG_DEBUG, "Channel %s: Key is now \"%s\".", Chan->name, Chan->key );
657 } /* Channel_SetKey */
658 
659 
660 GLOBAL void
661 Channel_SetMaxUsers( CHANNEL *Chan, long Count )
662 {
663 	assert( Chan != NULL );
664 
665 	Chan->maxusers = Count;
666 	Log( LOG_DEBUG, "Channel %s: Member limit is now %ld.", Chan->name, Chan->maxusers );
667 } /* Channel_SetMaxUsers */
668 
669 
670 GLOBAL bool
671 Channel_Write( CHANNEL *Chan, CLIENT *From, CLIENT *Client, char *Text )
672 {
673 	bool is_member, has_voice, is_op, ok;
674 
675 	/* Okay, target is a channel */
676 	is_member = has_voice = is_op = false;
677 	if( Channel_IsMemberOf( Chan, From ))
678 	{
679 		is_member = true;
680 		if( strchr( Channel_UserModes( Chan, From ), 'v' )) has_voice = true;
681 		if( strchr( Channel_UserModes( Chan, From ), 'o' )) is_op = true;
682 	}
683 
684 	/* Is the client allowed to write to channel? */
685 	ok = true;
686 	if( strchr( Channel_Modes( Chan ), 'n' ) && ( ! is_member )) ok = false;
687 	if( strchr( Channel_Modes( Chan ), 'm' ) && ( ! is_op ) && ( ! has_voice )) ok = false;
688 	
689 	/* Is the client banned? */
690 	if( Lists_CheckBanned( From, Chan ))
691 	{
692 		/* Client is banned, bus is he channel operator or has voice? */
693 		if(( ! has_voice ) && ( ! is_op )) ok = false;
694 	}
695 
696 	if( ! ok ) return IRC_WriteStrClient( From, ERR_CANNOTSENDTOCHAN_MSG, Client_ID( From ), Channel_Name( Chan ));
697 
698 	/* Send text */
699 	if( Client_Conn( From ) > NONE ) Conn_UpdateIdle( Client_Conn( From ));
700 	return IRC_WriteStrChannelPrefix( Client, Chan, From, true, "PRIVMSG %s :%s", Channel_Name( Chan ), Text );
701 } /* Channel_Write */
702 
703 
704 GLOBAL CHANNEL *
705 Channel_Create( char *Name )
706 {
707 	/* Create new CHANNEL structure and add it to linked list */
708 	CHANNEL *c;
709 
710 	assert( Name != NULL );
711 	
712 	c = (CHANNEL *)malloc( sizeof( CHANNEL ));
713 	if( ! c )
714 	{
715 		Log( LOG_EMERG, "Can't allocate memory! [New_Chan]" );
716 		return NULL;
717 	}
718 	memset( c, 0, sizeof( CHANNEL ));
719 	strlcpy( c->name, Name, sizeof( c->name ));
720 	c->hash = Hash( c->name );
721 	c->next = My_Channels;
722 	My_Channels = c;
723 	
724 	Log( LOG_DEBUG, "Created new channel structure for \"%s\".", Name );
725 	
726 	return c;
727 } /* Channel_Create */
728 
729 
730 LOCAL CL2CHAN *
731 Get_Cl2Chan( CHANNEL *Chan, CLIENT *Client )
732 {
733 	CL2CHAN *cl2chan;
734 
735 	assert( Chan != NULL );
736 	assert( Client != NULL );
737 
738 	cl2chan = My_Cl2Chan;
739 	while( cl2chan )
740 	{
741 		if(( cl2chan->channel == Chan ) && ( cl2chan->client == Client )) return cl2chan;
742 		cl2chan = cl2chan->next;
743 	}
744 	return NULL;
745 } /* Get_Cl2Chan */
746 
747 
748 LOCAL CL2CHAN *
749 Add_Client( CHANNEL *Chan, CLIENT *Client )
750 {
751 	CL2CHAN *cl2chan;
752 
753 	assert( Chan != NULL );
754 	assert( Client != NULL );
755 
756 	/* neue CL2CHAN-Struktur anlegen */
757 	cl2chan = (CL2CHAN *)malloc( sizeof( CL2CHAN ));
758 	if( ! cl2chan )
759 	{
760 		Log( LOG_EMERG, "Can't allocate memory! [Add_Client]" );
761 		return NULL;
762 	}
763 	cl2chan->channel = Chan;
764 	cl2chan->client = Client;
765 	strcpy( cl2chan->modes, "" );
766 
767 	/* Verketten */
768 	cl2chan->next = My_Cl2Chan;
769 	My_Cl2Chan = cl2chan;
770 
771 	Log( LOG_DEBUG, "User \"%s\" joined channel \"%s\".", Client_Mask( Client ), Chan->name );
772 
773 	return cl2chan;
774 } /* Add_Client */
775 
776 
777 LOCAL bool
778 Remove_Client( int Type, CHANNEL *Chan, CLIENT *Client, CLIENT *Origin, char *Reason, bool InformServer )
779 {
780 	CL2CHAN *cl2chan, *last_cl2chan;
781 	CHANNEL *c;
782 	
783 	assert( Chan != NULL );
784 	assert( Client != NULL );
785 	assert( Origin != NULL );
786 	assert( Reason != NULL );
787 
788 	last_cl2chan = NULL;
789 	cl2chan = My_Cl2Chan;
790 	while( cl2chan )
791 	{
792 		if(( cl2chan->channel == Chan ) && ( cl2chan->client == Client )) break;
793 		last_cl2chan = cl2chan;
794 		cl2chan = cl2chan->next;
795 	}
796 	if( ! cl2chan ) return false;
797 
798 	c = cl2chan->channel;
799 	assert( c != NULL );
800 
801 	/* Aus Verkettung loesen und freigeben */
802 	if( last_cl2chan ) last_cl2chan->next = cl2chan->next;
803 	else My_Cl2Chan = cl2chan->next;
804 	free( cl2chan );
805 
806 	switch( Type )
807 	{
808 		case REMOVE_QUIT:
809 			/* QUIT: andere Server wurden bereits informiert, vgl. Client_Destroy();
810 			 * hier also "nur" noch alle User in betroffenen Channeln infomieren */
811 			assert( InformServer == false );
812 			Log( LOG_DEBUG, "User \"%s\" left channel \"%s\" (%s).", Client_Mask( Client ), c->name, Reason );
813 			break;
814 		case REMOVE_KICK:
815 			/* User wurde geKICKed: ggf. andere Server sowie alle betroffenen User
816 			 * im entsprechenden Channel informieren */
817 			if( InformServer ) IRC_WriteStrServersPrefix( Client_NextHop( Origin ), Origin, "KICK %s %s :%s", c->name, Client_ID( Client ), Reason );
818 			IRC_WriteStrChannelPrefix( Client, c, Origin, false, "KICK %s %s :%s", c->name, Client_ID( Client ), Reason );
819 			if(( Client_Conn( Client ) > NONE ) && ( Client_Type( Client ) == CLIENT_USER )) IRC_WriteStrClientPrefix( Client, Origin, "KICK %s %s :%s", c->name, Client_ID( Client ), Reason );
820 			Log( LOG_DEBUG, "User \"%s\" has been kicked of \"%s\" by \"%s\": %s.", Client_Mask( Client ), c->name, Client_ID( Origin ), Reason );
821 			break;
822 		default:
823 			/* PART */
824 			if( InformServer ) IRC_WriteStrServersPrefix( Origin, Client, "PART %s :%s", c->name, Reason );
825 			IRC_WriteStrChannelPrefix( Origin, c, Client, false, "PART %s :%s", c->name, Reason );
826 			if(( Client_Conn( Origin ) > NONE ) && ( Client_Type( Origin ) == CLIENT_USER )) IRC_WriteStrClientPrefix( Origin, Client, "PART %s :%s", c->name, Reason );
827 			Log( LOG_DEBUG, "User \"%s\" left channel \"%s\" (%s).", Client_Mask( Client ), c->name, Reason );
828 	}
829 
830 	/* Wenn Channel nun leer und nicht pre-defined: loeschen */
831 	if( ! strchr( Channel_Modes( Chan ), 'P' ))
832 	{
833 		if( ! Get_First_Cl2Chan( NULL, Chan )) Delete_Channel( Chan );
834 	}
835 		
836 	return true;
837 } /* Remove_Client */
838 
839 
840 LOCAL CL2CHAN *
841 Get_First_Cl2Chan( CLIENT *Client, CHANNEL *Chan )
842 {
843 	return Get_Next_Cl2Chan( My_Cl2Chan, Client, Chan );
844 } /* Get_First_Cl2Chan */
845 
846 
847 LOCAL CL2CHAN *
848 Get_Next_Cl2Chan( CL2CHAN *Start, CLIENT *Client, CHANNEL *Channel )
849 {
850 	CL2CHAN *cl2chan;
851 
852 	assert( Client != NULL || Channel != NULL );
853 	
854 	cl2chan = Start;
855 	while( cl2chan )
856 	{
857 		if(( Client ) && ( cl2chan->client == Client )) return cl2chan;
858 		if(( Channel ) && ( cl2chan->channel == Channel )) return cl2chan;
859 		cl2chan = cl2chan->next;
860 	}
861 	return NULL;
862 } /* Get_Next_Cl2Chan */
863 
864 
865 LOCAL bool
866 Delete_Channel( CHANNEL *Chan )
867 {
868 	/* Channel-Struktur loeschen */
869 	
870 	CHANNEL *chan, *last_chan;
871 
872 	last_chan = NULL;
873 	chan = My_Channels;
874 	while( chan )
875 	{
876 		if( chan == Chan ) break;
877 		last_chan = chan;
878 		chan = chan->next;
879 	}
880 	if( ! chan ) return false;
881 
882 	Log( LOG_DEBUG, "Freed channel structure for \"%s\".", Chan->name );
883 
884 	/* Invite- und Ban-Lists aufraeumen */
885 	Lists_DeleteChannel( chan );
886 
887 	/* Neu verketten und freigeben */
888 	if( last_chan ) last_chan->next = chan->next;
889 	else My_Channels = chan->next;
890 	free( chan );
891 		
892 	return true;
893 } /* Delete_Channel */
894 
895 
896 /* -eof- */