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Date:: Thu Mar 11 22:16:31 2004 UTC
Message:: Fixed some warnings of non-gcc-compilers (e. g. original Apple compiler on A/UX): "warning: illegal pointer combination, op =".
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1 /*
2  * ngIRCd -- The Next Generation IRC Daemon
3  * Copyright (c)2001,2002 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  * Client management.
12  */
13 
14 
15 #define __client_c__
16 
17 
18 #include "portab.h"
19 
20 static char UNUSED id[] = "$Id: client.c,v 1.76 2004/03/11 22:16:31 alex Exp $";
21 
22 #include "imp.h"
23 #include <assert.h>
24 #include <unistd.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <strings.h>
29 #include <netdb.h>
30 
31 #include "conn.h"
32 
33 #include "exp.h"
34 #include "client.h"
35 
36 #include <imp.h>
37 #include "ngircd.h"
38 #include "channel.h"
39 #include "resolve.h"
40 #include "conf.h"
41 #include "hash.h"
42 #include "irc-write.h"
43 #include "log.h"
44 #include "messages.h"
45 
46 #include <exp.h>
47 
48 
49 #define GETID_LEN (CLIENT_NICK_LEN-1) + 1 + (CLIENT_USER_LEN-1) + 1 + (CLIENT_HOST_LEN-1) + 1
50 
51 
52 LOCAL CLIENT *This_Server, *My_Clients;
53 LOCAL CHAR GetID_Buffer[GETID_LEN];
54 
55 
56 LOCAL LONG Count PARAMS(( CLIENT_TYPE Type ));
57 LOCAL LONG MyCount PARAMS(( CLIENT_TYPE Type ));
58 
59 LOCAL CLIENT *New_Client_Struct PARAMS(( VOID ));
60 LOCAL VOID Generate_MyToken PARAMS(( CLIENT *Client ));
61 LOCAL VOID Adjust_Counters PARAMS(( CLIENT *Client ));
62 
63 #ifndef Client_DestroyNow
64 GLOBAL VOID Client_DestroyNow PARAMS((CLIENT *Client ));
65 #endif
66 
67 
68 LONG Max_Users = 0, My_Max_Users = 0;
69 
70 
71 GLOBAL VOID
72 Client_Init( VOID )
73 {
74 	struct hostent *h;
75 	
76 	This_Server = New_Client_Struct( );
77 	if( ! This_Server )
78 	{
79 		Log( LOG_EMERG, "Can't allocate client structure for server! Going down." );
80 		Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
81 		exit( 1 );
82 	}
83 
84 	/* Client-Struktur dieses Servers */
85 	This_Server->next = NULL;
86 	This_Server->type = CLIENT_SERVER;
87 	This_Server->conn_id = NONE;
88 	This_Server->introducer = This_Server;
89 	This_Server->mytoken = 1;
90 	This_Server->hops = 0;
91 
92 	gethostname( This_Server->host, CLIENT_HOST_LEN );
93 	h = gethostbyname( This_Server->host );
94 	if( h ) strlcpy( This_Server->host, h->h_name, sizeof( This_Server->host ));
95 
96 	Client_SetID( This_Server, Conf_ServerName );
97 	Client_SetInfo( This_Server, Conf_ServerInfo );
98 
99 	My_Clients = This_Server;
100 } /* Client_Init */
101 
102 
103 GLOBAL VOID
104 Client_Exit( VOID )
105 {
106 	CLIENT *c, *next;
107 	INT cnt;
108 
109 	if( NGIRCd_SignalRestart ) Client_Destroy( This_Server, "Server going down (restarting).", NULL, FALSE );
110 	else Client_Destroy( This_Server, "Server going down.", NULL, FALSE );
111 	
112 	cnt = 0;
113 	c = My_Clients;
114 	while( c )
115 	{
116 		cnt++;
117 		next = (CLIENT *)c->next;
118 		free( c );
119 		c = next;
120 	}
121 	if( cnt ) Log( LOG_INFO, "Freed %d client structure%s.", cnt, cnt == 1 ? "" : "s" );
122 } /* Client_Exit */
123 
124 
125 GLOBAL CLIENT *
126 Client_ThisServer( VOID )
127 {
128 	return This_Server;
129 } /* Client_ThisServer */
130 
131 
132 GLOBAL CLIENT *
133 Client_NewLocal( CONN_ID Idx, CHAR *Hostname, INT Type, BOOLEAN Idented )
134 {
135 	/* Neuen lokalen Client erzeugen: Wrapper-Funktion fuer Client_New(). */
136 	return Client_New( Idx, This_Server, NULL, Type, NULL, NULL, Hostname, NULL, 0, 0, NULL, Idented );
137 } /* Client_NewLocal */
138 
139 
140 GLOBAL CLIENT *
141 Client_NewRemoteServer( CLIENT *Introducer, CHAR *Hostname, CLIENT *TopServer, INT Hops, INT Token, CHAR *Info, BOOLEAN Idented )
142 {
143 	/* Neuen Remote-Client erzeugen: Wrapper-Funktion fuer Client_New (). */
144 	return Client_New( NONE, Introducer, TopServer, CLIENT_SERVER, Hostname, NULL, Hostname, Info, Hops, Token, NULL, Idented );
145 } /* Client_NewRemoteServer */
146 
147 
148 GLOBAL CLIENT *
149 Client_NewRemoteUser( CLIENT *Introducer, CHAR *Nick, INT Hops, CHAR *User, CHAR *Hostname, INT Token, CHAR *Modes, CHAR *Info, BOOLEAN Idented )
150 {
151 	/* Neuen Remote-Client erzeugen: Wrapper-Funktion fuer Client_New (). */
152 	return Client_New( NONE, Introducer, NULL, CLIENT_USER, Nick, User, Hostname, Info, Hops, Token, Modes, Idented );
153 } /* Client_NewRemoteUser */
154 
155 
156 GLOBAL CLIENT *
157 Client_New( CONN_ID Idx, CLIENT *Introducer, CLIENT *TopServer, INT Type, CHAR *ID, CHAR *User, CHAR *Hostname, CHAR *Info, INT Hops, INT Token, CHAR *Modes, BOOLEAN Idented )
158 {
159 	CLIENT *client;
160 
161 	assert( Idx >= NONE );
162 	assert( Introducer != NULL );
163 	assert( Hostname != NULL );
164 
165 	client = New_Client_Struct( );
166 	if( ! client ) return NULL;
167 
168 	/* Initialisieren */
169 	client->conn_id = Idx;
170 	client->introducer = Introducer;
171 	client->topserver = TopServer;
172 	client->type = Type;
173 	if( ID ) Client_SetID( client, ID );
174 	if( User ) Client_SetUser( client, User, Idented );
175 	if( Hostname ) Client_SetHostname( client, Hostname );
176 	if( Info ) Client_SetInfo( client, Info );
177 	client->hops = Hops;
178 	client->token = Token;
179 	if( Modes ) Client_SetModes( client, Modes );
180 	if( Type == CLIENT_SERVER ) Generate_MyToken( client );
181 
182 	/* ist der User away? */
183 	if( strchr( client->modes, 'a' )) strlcpy( client->away, DEFAULT_AWAY_MSG, sizeof( client->away ));
184 
185 	/* Verketten */
186 	client->next = (POINTER *)My_Clients;
187 	My_Clients = client;
188 
189 	/* Adjust counters */
190 	Adjust_Counters( client );
191 
192 	return client;
193 } /* Client_New */
194 
195 
196 GLOBAL VOID
197 Client_Destroy( CLIENT *Client, CHAR *LogMsg, CHAR *FwdMsg, BOOLEAN SendQuit )
198 {
199 	/* Client entfernen. */
200 	
201 	CLIENT *last, *c;
202 	CHAR msg[LINE_LEN], *txt;
203 
204 	assert( Client != NULL );
205 
206 	if( LogMsg ) txt = LogMsg;
207 	else txt = FwdMsg;
208 	if( ! txt ) txt = "Reason unknown.";
209 
210 	/* Netz-Split-Nachricht vorbereiten (noch nicht optimal) */
211 	if( Client->type == CLIENT_SERVER ) snprintf( msg, sizeof( msg ), "%s: lost server %s", This_Server->id, Client->id );
212 
213 	last = NULL;
214 	c = My_Clients;
215 	while( c )
216 	{
217 		if(( Client->type == CLIENT_SERVER ) && ( c->introducer == Client ) && ( c != Client ))
218 		{
219 			/* der Client, der geloescht wird ist ein Server. Der Client, den wir gerade
220 			 * pruefen, ist ein Child von diesem und muss daher auch entfernt werden */
221 			Client_Destroy( c, NULL, msg, FALSE );
222 			last = NULL;
223 			c = My_Clients;
224 			continue;
225 		}
226 		if( c == Client )
227 		{
228 			/* Wir haben den Client gefunden: entfernen */
229 			if( last ) last->next = c->next;
230 			else My_Clients = (CLIENT *)c->next;
231 
232 			if( c->type == CLIENT_USER )
233 			{
234 				if( c->conn_id != NONE )
235 				{
236 					/* Ein lokaler User */
237 					Log( LOG_NOTICE, "User \"%s\" unregistered (connection %d): %s", Client_Mask( c ), c->conn_id, txt );
238 
239 					if( SendQuit )
240 					{
241 						/* Alle andere Server informieren! */
242 						if( FwdMsg ) IRC_WriteStrServersPrefix( NULL, c, "QUIT :%s", FwdMsg );
243 						else IRC_WriteStrServersPrefix( NULL, c, "QUIT :" );
244 					}
245 				}
246 				else
247 				{
248 					/* Remote User */
249 					Log( LOG_DEBUG, "User \"%s\" unregistered: %s", Client_Mask( c ), txt );
250 
251 					if( SendQuit )
252 					{
253 						/* Andere Server informieren, ausser denen, die "in
254 						 * Richtung dem liegen", auf dem der User registriert
255 						 * ist. Von denen haben wir das QUIT ja wohl bekommen. */
256 						if( FwdMsg ) IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "QUIT :%s", FwdMsg );
257 						else IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "QUIT :" );
258 					}
259 				}
260 				Channel_Quit( c, FwdMsg ? FwdMsg : c->id );
261 			}
262 			else if( c->type == CLIENT_SERVER )
263 			{
264 				if( c != This_Server )
265 				{
266 					if( c->conn_id != NONE ) Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" unregistered (connection %d): %s", c->id, c->conn_id, txt );
267 					else Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" unregistered: %s", c->id, txt );
268 				}
269 
270 				/* andere Server informieren */
271 				if( ! NGIRCd_SignalQuit )
272 				{
273 					if( FwdMsg ) IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :%s", c->id, FwdMsg );
274 					else IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :", c->id );
275 				}
276 			}
277 			else
278 			{
279 				if( c->conn_id != NONE )
280 				{
281 					if( c->id[0] ) Log( LOG_NOTICE, "Client \"%s\" unregistered (connection %d): %s", c->id, c->conn_id, txt );
282 					else Log( LOG_NOTICE, "Client unregistered (connection %d): %s", c->conn_id, txt );
283 				}
284 				else
285 				{
286 					if( c->id[0] ) Log( LOG_WARNING, "Unregistered unknown client \"%s\": %s", c->id, txt );
287 					else Log( LOG_WARNING, "Unregistered unknown client: %s", c->id, txt );
288 				}
289 			}
290 
291 			free( c );
292 			break;
293 		}
294 		last = c;
295 		c = (CLIENT *)c->next;
296 	}
297 } /* Client_Destroy */
298 
299 
300 GLOBAL VOID
301 Client_DestroyNow( CLIENT *Client )
302 {
303 	/* Destroy client structure immediately. This function is only
304 	 * intended for the connection layer to remove client structures
305 	 * of connections that can't be established! */
306 
307 	CLIENT *last, *c;
308 
309 	assert( Client != NULL );
310 
311 	last = NULL;
312 	c = My_Clients;
313 	while( c )
314 	{
315 		if( c == Client )
316 		{
317 			/* Wir haben den Client gefunden: entfernen */
318 			if( last ) last->next = c->next;
319 			else My_Clients = (CLIENT *)c->next;
320 			free( c );
321 			break;
322 		}
323 		last = c;
324 		c = (CLIENT *)c->next;
325 	}
326 } /* Client_DestroyNow */
327 
328 
329 GLOBAL VOID
330 Client_SetHostname( CLIENT *Client, CHAR *Hostname )
331 {
332 	/* Hostname eines Clients setzen */
333 	
334 	assert( Client != NULL );
335 	assert( Hostname != NULL );
336 	
337 	strlcpy( Client->host, Hostname, sizeof( Client->host ));
338 } /* Client_SetHostname */
339 
340 
341 GLOBAL VOID
342 Client_SetID( CLIENT *Client, CHAR *ID )
343 {
344 	/* Hostname eines Clients setzen, Hash-Wert berechnen */
345 
346 	assert( Client != NULL );
347 	assert( ID != NULL );
348 	
349 	strlcpy( Client->id, ID, sizeof( Client->id ));
350 
351 	/* Hash */
352 	Client->hash = Hash( Client->id );
353 } /* Client_SetID */
354 
355 
356 GLOBAL VOID
357 Client_SetUser( CLIENT *Client, CHAR *User, BOOLEAN Idented )
358 {
359 	/* Username eines Clients setzen */
360 
361 	assert( Client != NULL );
362 	assert( User != NULL );
363 	
364 	if( Idented ) strlcpy( Client->user, User, sizeof( Client->user ));
365 	else
366 	{
367 		Client->user[0] = '~';
368 		strlcpy( Client->user + 1, User, sizeof( Client->user ) - 1 );
369 	}
370 } /* Client_SetUser */
371 
372 
373 GLOBAL VOID
374 Client_SetInfo( CLIENT *Client, CHAR *Info )
375 {
376 	/* Hostname eines Clients setzen */
377 
378 	assert( Client != NULL );
379 	assert( Info != NULL );
380 	
381 	strlcpy( Client->info, Info, sizeof( Client->info ));
382 } /* Client_SetInfo */
383 
384 
385 GLOBAL VOID
386 Client_SetModes( CLIENT *Client, CHAR *Modes )
387 {
388 	/* Modes eines Clients setzen */
389 
390 	assert( Client != NULL );
391 	assert( Modes != NULL );
392 
393 	strlcpy( Client->modes, Modes, sizeof( Client->modes ));
394 } /* Client_SetModes */
395 
396 
397 GLOBAL VOID
398 Client_SetFlags( CLIENT *Client, CHAR *Flags )
399 {
400 	/* Flags eines Clients setzen */
401 
402 	assert( Client != NULL );
403 	assert( Flags != NULL );
404 
405 	strlcpy( Client->flags, Flags, sizeof( Client->flags ));
406 } /* Client_SetFlags */
407 
408 
409 GLOBAL VOID
410 Client_SetPassword( CLIENT *Client, CHAR *Pwd )
411 {
412 	/* Von einem Client geliefertes Passwort */
413 
414 	assert( Client != NULL );
415 	assert( Pwd != NULL );
416 	
417 	strlcpy( Client->pwd, Pwd, sizeof( Client->pwd ));
418 } /* Client_SetPassword */
419 
420 
421 GLOBAL VOID
422 Client_SetAway( CLIENT *Client, CHAR *Txt )
423 {
424 	/* Set AWAY reason of client */
425 
426 	assert( Client != NULL );
427 	assert( Txt != NULL );
428 
429 	strlcpy( Client->away, Txt, sizeof( Client->away ));
430 	Log( LOG_DEBUG, "User \"%s\" is away: %s", Client_Mask( Client ), Txt );
431 } /* Client_SetAway */
432 
433 
434 GLOBAL VOID
435 Client_SetType( CLIENT *Client, INT Type )
436 {
437 	assert( Client != NULL );
438 	Client->type = Type;
439 	if( Type == CLIENT_SERVER ) Generate_MyToken( Client );
440 	Adjust_Counters( Client );
441 } /* Client_SetType */
442 
443 
444 GLOBAL VOID
445 Client_SetHops( CLIENT *Client, INT Hops )
446 {
447 	assert( Client != NULL );
448 	Client->hops = Hops;
449 } /* Client_SetHops */
450 
451 
452 GLOBAL VOID
453 Client_SetToken( CLIENT *Client, INT Token )
454 {
455 	assert( Client != NULL );
456 	Client->token = Token;
457 } /* Client_SetToken */
458 
459 
460 GLOBAL VOID
461 Client_SetIntroducer( CLIENT *Client, CLIENT *Introducer )
462 {
463 	assert( Client != NULL );
464 	assert( Introducer != NULL );
465 	Client->introducer = Introducer;
466 } /* Client_SetIntroducer */
467 
468 
469 GLOBAL VOID
470 Client_SetOperByMe( CLIENT *Client, BOOLEAN OperByMe )
471 {
472 	assert( Client != NULL );
473 	Client->oper_by_me = OperByMe;
474 } /* Client_SetOperByMe */
475 
476 
477 GLOBAL BOOLEAN
478 Client_ModeAdd( CLIENT *Client, CHAR Mode )
479 {
480 	/* Mode soll gesetzt werden. TRUE wird geliefert, wenn der
481 	 * Mode neu gesetzt wurde, FALSE, wenn der Client den Mode
482 	 * bereits hatte. */
483 
484 	CHAR x[2];
485 	
486 	assert( Client != NULL );
487 
488 	x[0] = Mode; x[1] = '\0';
489 	if( ! strchr( Client->modes, x[0] ))
490 	{
491 		/* Client hat den Mode noch nicht -> setzen */
492 		strlcat( Client->modes, x, sizeof( Client->modes ));
493 		return TRUE;
494 	}
495 	else return FALSE;
496 } /* Client_ModeAdd */
497 
498 
499 GLOBAL BOOLEAN
500 Client_ModeDel( CLIENT *Client, CHAR Mode )
501 {
502 	/* Mode soll geloescht werden. TRUE wird geliefert, wenn der
503 	* Mode entfernt wurde, FALSE, wenn der Client den Mode
504 	* ueberhaupt nicht hatte. */
505 
506 	CHAR x[2], *p;
507 
508 	assert( Client != NULL );
509 
510 	x[0] = Mode; x[1] = '\0';
511 
512 	p = strchr( Client->modes, x[0] );
513 	if( ! p ) return FALSE;
514 
515 	/* Client hat den Mode -> loeschen */
516 	while( *p )
517 	{
518 		*p = *(p + 1);
519 		p++;
520 	}
521 	return TRUE;
522 } /* Client_ModeDel */
523 
524 
525 GLOBAL CLIENT *
526 Client_GetFromConn( CONN_ID Idx )
527 {
528 	/* Client-Struktur, die zur lokalen Verbindung Idx gehoert,
529 	 * liefern. Wird keine gefunden, so wird NULL geliefert. */
530 
531 	CLIENT *c;
532 
533 	assert( Idx >= 0 );
534 	
535 	c = My_Clients;
536 	while( c )
537 	{
538 		if( c->conn_id == Idx ) return c;
539 		c = (CLIENT *)c->next;
540 	}
541 	return NULL;
542 } /* Client_GetFromConn */
543 
544 
545 GLOBAL CLIENT *
546 Client_Search( CHAR *Nick )
547 {
548 	/* Client-Struktur, die den entsprechenden Nick hat, liefern.
549 	 * Wird keine gefunden, so wird NULL geliefert. */
550 
551 	CHAR search_id[CLIENT_ID_LEN], *ptr;
552 	CLIENT *c = NULL;
553 	UINT32 search_hash;
554 
555 	assert( Nick != NULL );
556 
557 	/* Nick kopieren und ggf. Host-Mask abschneiden */
558 	strlcpy( search_id, Nick, sizeof( search_id ));
559 	ptr = strchr( search_id, '!' );
560 	if( ptr ) *ptr = '\0';
561 
562 	search_hash = Hash( search_id );
563 
564 	c = My_Clients;
565 	while( c )
566 	{
567 		if( c->hash == search_hash )
568 		{
569 			/* lt. Hash-Wert: Treffer! */
570 			if( strcasecmp( c->id, search_id ) == 0 ) return c;
571 		}
572 		c = (CLIENT *)c->next;
573 	}
574 	return NULL;
575 } /* Client_Search */
576 
577 
578 GLOBAL CLIENT *
579 Client_GetFromToken( CLIENT *Client, INT Token )
580 {
581 	/* Client-Struktur, die den entsprechenden Introducer (=Client)
582 	 * und das gegebene Token hat, liefern. Wird keine gefunden,
583 	 * so wird NULL geliefert. */
584 
585 	CLIENT *c;
586 
587 	assert( Client != NULL );
588 	assert( Token > 0 );
589 
590 	c = My_Clients;
591 	while( c )
592 	{
593 		if(( c->type == CLIENT_SERVER ) && ( c->introducer == Client ) && ( c->token == Token )) return c;
594 		c = (CLIENT *)c->next;
595 	}
596 	return NULL;
597 } /* Client_GetFromToken */
598 
599 
600 GLOBAL INT
601 Client_Type( CLIENT *Client )
602 {
603 	assert( Client != NULL );
604 	return Client->type;
605 } /* Client_Type */
606 
607 
608 GLOBAL CONN_ID
609 Client_Conn( CLIENT *Client )
610 {
611 	assert( Client != NULL );
612 	return Client->conn_id;
613 } /* Client_Conn */
614 
615 
616 GLOBAL CHAR *
617 Client_ID( CLIENT *Client )
618 {
619 	assert( Client != NULL );
620 
621 #ifdef DEBUG
622 	if( Client->type == CLIENT_USER ) assert( strlen( Client->id ) < CLIENT_NICK_LEN );
623 #endif
624 						   
625 	if( Client->id[0] ) return Client->id;
626 	else return "*";
627 } /* Client_ID */
628 
629 
630 GLOBAL CHAR *
631 Client_Info( CLIENT *Client )
632 {
633 	assert( Client != NULL );
634 	return Client->info;
635 } /* Client_Info */
636 
637 
638 GLOBAL CHAR *
639 Client_User( CLIENT *Client )
640 {
641 	assert( Client != NULL );
642 	if( Client->user[0] ) return Client->user;
643 	else return "~";
644 } /* Client_User */
645 
646 
647 GLOBAL CHAR *
648 Client_Hostname( CLIENT *Client )
649 {
650 	assert( Client != NULL );
651 	return Client->host;
652 } /* Client_Hostname */
653 
654 
655 GLOBAL CHAR *
656 Client_Password( CLIENT *Client )
657 {
658 	assert( Client != NULL );
659 	return Client->pwd;
660 } /* Client_Password */
661 
662 
663 GLOBAL CHAR *
664 Client_Modes( CLIENT *Client )
665 {
666 	assert( Client != NULL );
667 	return Client->modes;
668 } /* Client_Modes */
669 
670 
671 GLOBAL CHAR *
672 Client_Flags( CLIENT *Client )
673 {
674 	assert( Client != NULL );
675 	return Client->flags;
676 } /* Client_Flags */
677 
678 
679 GLOBAL BOOLEAN
680 Client_OperByMe( CLIENT *Client )
681 {
682 	assert( Client != NULL );
683 	return Client->oper_by_me;
684 } /* Client_OperByMe */
685 
686 
687 GLOBAL INT
688 Client_Hops( CLIENT *Client )
689 {
690 	assert( Client != NULL );
691 	return Client->hops;
692 } /* Client_Hops */
693 
694 
695 GLOBAL INT
696 Client_Token( CLIENT *Client )
697 {
698 	assert( Client != NULL );
699 	return Client->token;
700 } /* Client_Token */
701 
702 
703 GLOBAL INT
704 Client_MyToken( CLIENT *Client )
705 {
706 	assert( Client != NULL );
707 	return Client->mytoken;
708 } /* Client_MyToken */
709 
710 
711 GLOBAL CLIENT *
712 Client_NextHop( CLIENT *Client )
713 {
714 	CLIENT *c;
715 	
716 	assert( Client != NULL );
717 
718 	c = Client;
719 	while( c->introducer && ( c->introducer != c ) && ( c->introducer != This_Server )) c = c->introducer;
720 	return c;
721 } /* Client_NextHop */
722 
723 
724 GLOBAL CHAR *
725 Client_Mask( CLIENT *Client )
726 {
727 	/* Client-"ID" liefern, wie sie z.B. fuer
728 	 * Prefixe benoetigt wird. */
729 
730 	assert( Client != NULL );
731 	
732 	if( Client->type == CLIENT_SERVER ) return Client->id;
733 
734 	snprintf( GetID_Buffer, GETID_LEN, "%s!%s@%s", Client->id, Client->user, Client->host );
735 	return GetID_Buffer;
736 } /* Client_Mask */
737 
738 
739 GLOBAL CLIENT *
740 Client_Introducer( CLIENT *Client )
741 {
742 	assert( Client != NULL );
743 	return Client->introducer;
744 } /* Client_Introducer */
745 
746 
747 GLOBAL CLIENT *
748 Client_TopServer( CLIENT *Client )
749 {
750 	assert( Client != NULL );
751 	return Client->topserver;
752 } /* Client_TopServer */
753 
754 
755 GLOBAL BOOLEAN
756 Client_HasMode( CLIENT *Client, CHAR Mode )
757 {
758 	assert( Client != NULL );
759 	return strchr( Client->modes, Mode ) != NULL;
760 } /* Client_HasMode */
761 
762 
763 GLOBAL CHAR *
764 Client_Away( CLIENT *Client )
765 {
766 	/* AWAY-Text liefern */
767 
768 	assert( Client != NULL );
769 	return Client->away;
770 } /* Client_Away */
771 
772 
773 GLOBAL BOOLEAN
774 Client_CheckNick( CLIENT *Client, CHAR *Nick )
775 {
776 	/* Nick ueberpruefen */
777 
778 	assert( Client != NULL );
779 	assert( Nick != NULL );
780 	
781 	/* Nick ungueltig? */
782 	if( ! Client_IsValidNick( Nick ))
783 	{
784 		IRC_WriteStrClient( Client, ERR_ERRONEUSNICKNAME_MSG, Client_ID( Client ), Nick );
785 		return FALSE;
786 	}
787 
788 	/* Nick bereits vergeben? */
789 	if( Client_Search( Nick ))
790 	{
791 		/* den Nick gibt es bereits */
792 		IRC_WriteStrClient( Client, ERR_NICKNAMEINUSE_MSG, Client_ID( Client ), Nick );
793 		return FALSE;
794 	}
795 
796 	return TRUE;
797 } /* Client_CheckNick */
798 
799 
800 GLOBAL BOOLEAN
801 Client_CheckID( CLIENT *Client, CHAR *ID )
802 {
803 	/* Nick ueberpruefen */
804 
805 	CHAR str[COMMAND_LEN];
806 	CLIENT *c;
807 
808 	assert( Client != NULL );
809 	assert( Client->conn_id > NONE );
810 	assert( ID != NULL );
811 
812 	/* Nick zu lang? */
813 	if( strlen( ID ) > CLIENT_ID_LEN )
814 	{
815 		IRC_WriteStrClient( Client, ERR_ERRONEUSNICKNAME_MSG, Client_ID( Client ), ID );
816 		return FALSE;
817 	}
818 
819 	/* ID bereits vergeben? */
820 	c = My_Clients;
821 	while( c )
822 	{
823 		if( strcasecmp( c->id, ID ) == 0 )
824 		{
825 			/* die Server-ID gibt es bereits */
826 			snprintf( str, sizeof( str ), "ID \"%s\" already registered", ID );
827 			if( Client->conn_id != c->conn_id ) Log( LOG_ERR, "%s (on connection %d)!", str, c->conn_id );
828 			else Log( LOG_ERR, "%s (via network)!", str );
829 			Conn_Close( Client->conn_id, str, str, TRUE );
830 			return FALSE;
831 		}
832 		c = (CLIENT *)c->next;
833 	}
834 
835 	return TRUE;
836 } /* Client_CheckID */
837 
838 
839 GLOBAL CLIENT *
840 Client_First( VOID )
841 {
842 	/* Ersten Client liefern. */
843 
844 	return My_Clients;
845 } /* Client_First */
846 
847 
848 GLOBAL CLIENT *
849 Client_Next( CLIENT *c )
850 {
851 	/* Naechsten Client liefern. Existiert keiner,
852 	 * so wird NULL geliefert. */
853 
854 	assert( c != NULL );
855 	return (CLIENT *)c->next;
856 } /* Client_Next */
857 
858 
859 GLOBAL LONG
860 Client_UserCount( VOID )
861 {
862 	return Count( CLIENT_USER );
863 } /* Client_UserCount */
864 
865 
866 GLOBAL LONG
867 Client_ServiceCount( VOID )
868 {
869 	return Count( CLIENT_SERVICE );;
870 } /* Client_ServiceCount */
871 
872 
873 GLOBAL LONG
874 Client_ServerCount( VOID )
875 {
876 	return Count( CLIENT_SERVER );
877 } /* Client_ServerCount */
878 
879 
880 GLOBAL LONG
881 Client_MyUserCount( VOID )
882 {
883 	return MyCount( CLIENT_USER );
884 } /* Client_MyUserCount */
885 
886 
887 GLOBAL LONG
888 Client_MyServiceCount( VOID )
889 {
890 	return MyCount( CLIENT_SERVICE );
891 } /* Client_MyServiceCount */
892 
893 
894 GLOBAL LONG
895 Client_MyServerCount( VOID )
896 {
897 	CLIENT *c;
898 	LONG cnt;
899 
900 	cnt = 0;
901 	c = My_Clients;
902 	while( c )
903 	{
904 		if(( c->type == CLIENT_SERVER ) && ( c->hops == 1 )) cnt++;
905 		c = (CLIENT *)c->next;
906 	}
907 	return cnt;
908 } /* Client_MyServerCount */
909 
910 
911 GLOBAL LONG
912 Client_OperCount( VOID )
913 {
914 	CLIENT *c;
915 	LONG cnt;
916 
917 	cnt = 0;
918 	c = My_Clients;
919 	while( c )
920 	{
921 		if( c && ( c->type == CLIENT_USER ) && ( strchr( c->modes, 'o' ))) cnt++;
922 		c = (CLIENT *)c->next;
923 	}
924 	return cnt;
925 } /* Client_OperCount */
926 
927 
928 GLOBAL LONG
929 Client_UnknownCount( VOID )
930 {
931 	CLIENT *c;
932 	LONG cnt;
933 
934 	cnt = 0;
935 	c = My_Clients;
936 	while( c )
937 	{
938 		if( c && ( c->type != CLIENT_USER ) && ( c->type != CLIENT_SERVICE ) && ( c->type != CLIENT_SERVER )) cnt++;
939 		c = (CLIENT *)c->next;
940 	}
941 	return cnt;
942 } /* Client_UnknownCount */
943 
944 
945 GLOBAL LONG
946 Client_MaxUserCount( VOID )
947 {
948 	return Max_Users;
949 } /* Client_MaxUserCount */
950 
951 
952 GLOBAL LONG
953 Client_MyMaxUserCount( VOID )
954 {
955 	return My_Max_Users;
956 } /* Client_MyMaxUserCount */
957 
958 
959 GLOBAL BOOLEAN
960 Client_IsValidNick( CHAR *Nick )
961 {
962 	/* Ist der Nick gueltig? */
963 
964 	CHAR *ptr, goodchars[20];
965 	
966 	assert( Nick != NULL );
967 
968 	strcpy( goodchars, ";0123456789-" );
969 
970 	if( Nick[0] == '#' ) return FALSE;
971 	if( strchr( goodchars, Nick[0] )) return FALSE;
972 	if( strlen( Nick ) >= CLIENT_NICK_LEN ) return FALSE;
973 
974 	ptr = Nick;
975 	while( *ptr )
976 	{
977 		if(( *ptr < 'A' ) && ( ! strchr( goodchars, *ptr ))) return FALSE;
978 		if(( *ptr > '}' ) && ( ! strchr( goodchars, *ptr ))) return FALSE;
979 		ptr++;
980 	}
981 	
982 	return TRUE;
983 } /* Client_IsValidNick */
984 
985 
986 LOCAL LONG
987 Count( CLIENT_TYPE Type )
988 {
989 	CLIENT *c;
990 	LONG cnt;
991 
992 	cnt = 0;
993 	c = My_Clients;
994 	while( c )
995 	{
996 		if( c->type == Type ) cnt++;
997 		c = (CLIENT *)c->next;
998 	}
999 	return cnt;
1000 } /* Count */
1001 
1002 
1003 LOCAL LONG
1004 MyCount( CLIENT_TYPE Type )
1005 {
1006 	CLIENT *c;
1007 	LONG cnt;
1008 
1009 	cnt = 0;
1010 	c = My_Clients;
1011 	while( c )
1012 	{
1013 		if(( c->introducer == This_Server ) && ( c->type == Type )) cnt++;
1014 		c = (CLIENT *)c->next;
1015 	}
1016 	return cnt;
1017 } /* MyCount */
1018 
1019 
1020 LOCAL CLIENT *
1021 New_Client_Struct( VOID )
1022 {
1023 	/* Neue CLIENT-Struktur pre-initialisieren */
1024 	
1025 	CLIENT *c;
1026 	
1027 	c = (CLIENT *)malloc( sizeof( CLIENT ));
1028 	if( ! c )
1029 	{
1030 		Log( LOG_EMERG, "Can't allocate memory! [New_Client_Struct]" );
1031 		return NULL;
1032 	}
1033 
1034 	c->next = NULL;
1035 	c->hash = 0;
1036 	c->type = CLIENT_UNKNOWN;
1037 	c->conn_id = NONE;
1038 	c->introducer = NULL;
1039 	c->topserver = NULL;
1040 	strcpy( c->id, "" );
1041 	strcpy( c->pwd, "" );
1042 	strcpy( c->host, "" );
1043 	strcpy( c->user, "" );
1044 	strcpy( c->info, "" );
1045 	strcpy( c->modes, "" );
1046 	c->oper_by_me = FALSE;
1047 	c->hops = -1;
1048 	c->token = -1;
1049 	c->mytoken = -1;
1050 	strcpy( c->away, "" );
1051 	strcpy( c->flags, "" );
1052 
1053 	return c;
1054 } /* New_Client */
1055 
1056 
1057 LOCAL VOID
1058 Generate_MyToken( CLIENT *Client )
1059 {
1060 	CLIENT *c;
1061 	INT token;
1062 
1063 	c = My_Clients;
1064 	token = 2;
1065 	while( c )
1066 	{
1067 		if( c->mytoken == token )
1068 		{
1069 			/* Das Token wurde bereits vergeben */
1070 			token++;
1071 			c = My_Clients;
1072 			continue;
1073 		}
1074 		else c = (CLIENT *)c->next;
1075 	}
1076 	Client->mytoken = token;
1077 	Log( LOG_DEBUG, "Assigned token %d to server \"%s\".", token, Client->id );
1078 } /* Generate_MyToken */
1079 
1080 
1081 LOCAL VOID
1082 Adjust_Counters( CLIENT *Client )
1083 {
1084 	LONG count;
1085 
1086 	assert( Client != NULL );
1087 
1088 	if( Client->type != CLIENT_USER ) return;
1089 	
1090 	if( Client->conn_id != NONE )
1091 	{
1092 		/* Local connection */
1093 		count = Client_MyUserCount( );
1094 		if( count > My_Max_Users ) My_Max_Users = count;
1095 	}
1096 	count = Client_UserCount( );
1097 	if( count > Max_Users ) Max_Users = count;
1098 } /* Adjust_Counters */
1099 
1100 
1101 /* -eof- */