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Date:: Tue Sep 3 18:54:31 2002 UTC
Message:: - CLIENT-Struktur um Flags erweitert. - neue Funktionen Client_SetFlags() und Client_Flags().
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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  * Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
6  * der GNU General Public License (GPL), wie von der Free Software Foundation
7  * herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
8  * der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
9  * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
10  * der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
11  *
12  * $Id: client.c,v 1.60 2002/09/03 18:54:31 alex Exp $
13  *
14  * client.c: Management aller Clients
15  *
16  * Der Begriff "Client" ist in diesem Fall evtl. etwas verwirrend: Clients sind
17  * alle Verbindungen, die im gesamten(!) IRC-Netzwerk bekannt sind. Das sind IRC-
18  * Clients (User), andere Server und IRC-Services.
19  * Ueber welchen IRC-Server die Verbindung nun tatsaechlich in das Netzwerk her-
20  * gestellt wurde, muss der jeweiligen Struktur entnommen werden. Ist es dieser
21  * Server gewesen, so existiert eine entsprechende CONNECTION-Struktur.
22  */
23 
24 
25 #define __client_c__
26 
27 
28 #include "portab.h"
29 
30 #include "imp.h"
31 #include <assert.h>
32 #include <unistd.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <netdb.h>
37 
38 #include "conn.h"
39 
40 #include "exp.h"
41 #include "client.h"
42 
43 #include <imp.h>
44 #include "ngircd.h"
45 #include "channel.h"
46 #include "resolve.h"
47 #include "conf.h"
48 #include "hash.h"
49 #include "irc-write.h"
50 #include "log.h"
51 #include "messages.h"
52 
53 #include <exp.h>
54 
55 
56 LOCAL CLIENT *This_Server, *My_Clients;
57 LOCAL CHAR GetID_Buffer[CLIENT_ID_LEN];
58 
59 
60 LOCAL INT Count PARAMS(( CLIENT_TYPE Type ));
61 LOCAL INT MyCount PARAMS(( CLIENT_TYPE Type ));
62 
63 LOCAL CLIENT *New_Client_Struct PARAMS(( VOID ));
64 LOCAL VOID Generate_MyToken PARAMS(( CLIENT *Client ));
65 
66 
67 GLOBAL VOID
68 Client_Init( VOID )
69 {
70 	struct hostent *h;
71 	
72 	This_Server = New_Client_Struct( );
73 	if( ! This_Server )
74 	{
75 		Log( LOG_EMERG, "Can't allocate client structure for server! Going down." );
76 		Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
77 		exit( 1 );
78 	}
79 
80 	/* Client-Struktur dieses Servers */
81 	This_Server->next = NULL;
82 	This_Server->type = CLIENT_SERVER;
83 	This_Server->conn_id = NONE;
84 	This_Server->introducer = This_Server;
85 	This_Server->mytoken = 1;
86 	This_Server->hops = 0;
87 
88 	gethostname( This_Server->host, CLIENT_HOST_LEN );
89 	h = gethostbyname( This_Server->host );
90 	if( h ) strcpy( This_Server->host, h->h_name );
91 
92 	Client_SetID( This_Server, Conf_ServerName );
93 	Client_SetInfo( This_Server, Conf_ServerInfo );
94 
95 	My_Clients = This_Server;
96 } /* Client_Init */
97 
98 
99 GLOBAL VOID
100 Client_Exit( VOID )
101 {
102 	CLIENT *c, *next;
103 	INT cnt;
104 
105 	if( NGIRCd_Restart ) Client_Destroy( This_Server, "Server going down (restarting).", NULL, FALSE );
106 	else Client_Destroy( This_Server, "Server going down.", NULL, FALSE );
107 	
108 	cnt = 0;
109 	c = My_Clients;
110 	while( c )
111 	{
112 		cnt++;
113 		next = (CLIENT *)c->next;
114 		free( c );
115 		c = next;
116 	}
117 	if( cnt ) Log( LOG_INFO, "Freed %d client structure%s.", cnt, cnt == 1 ? "" : "s" );
118 } /* Client_Exit */
119 
120 
121 GLOBAL CLIENT *
122 Client_ThisServer( VOID )
123 {
124 	return This_Server;
125 } /* Client_ThisServer */
126 
127 
128 GLOBAL CLIENT *
129 Client_NewLocal( CONN_ID Idx, CHAR *Hostname, INT Type, BOOLEAN Idented )
130 {
131 	/* Neuen lokalen Client erzeugen: Wrapper-Funktion fuer Client_New(). */
132 	return Client_New( Idx, This_Server, NULL, Type, NULL, NULL, Hostname, NULL, 0, 0, NULL, Idented );
133 } /* Client_NewLocal */
134 
135 
136 GLOBAL CLIENT *
137 Client_NewRemoteServer( CLIENT *Introducer, CHAR *Hostname, CLIENT *TopServer, INT Hops, INT Token, CHAR *Info, BOOLEAN Idented )
138 {
139 	/* Neuen Remote-Client erzeugen: Wrapper-Funktion fuer Client_New (). */
140 	return Client_New( NONE, Introducer, TopServer, CLIENT_SERVER, Hostname, NULL, Hostname, Info, Hops, Token, NULL, Idented );
141 } /* Client_NewRemoteServer */
142 
143 
144 GLOBAL CLIENT *
145 Client_NewRemoteUser( CLIENT *Introducer, CHAR *Nick, INT Hops, CHAR *User, CHAR *Hostname, INT Token, CHAR *Modes, CHAR *Info, BOOLEAN Idented )
146 {
147 	/* Neuen Remote-Client erzeugen: Wrapper-Funktion fuer Client_New (). */
148 	return Client_New( NONE, Introducer, NULL, CLIENT_USER, Nick, User, Hostname, Info, Hops, Token, Modes, Idented );
149 } /* Client_NewRemoteUser */
150 
151 
152 GLOBAL CLIENT *
153 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 )
154 {
155 	CLIENT *client;
156 
157 	assert( Idx >= NONE );
158 	assert( Introducer != NULL );
159 	assert( Hostname != NULL );
160 
161 	client = New_Client_Struct( );
162 	if( ! client ) return NULL;
163 
164 	/* Initialisieren */
165 	client->conn_id = Idx;
166 	client->introducer = Introducer;
167 	client->topserver = TopServer;
168 	client->type = Type;
169 	if( ID ) Client_SetID( client, ID );
170 	if( User ) Client_SetUser( client, User, Idented );
171 	if( Hostname ) Client_SetHostname( client, Hostname );
172 	if( Info ) Client_SetInfo( client, Info );
173 	client->hops = Hops;
174 	client->token = Token;
175 	if( Modes ) Client_SetModes( client, Modes );
176 	if( Type == CLIENT_SERVER ) Generate_MyToken( client );
177 
178 	/* ist der User away? */
179 	if( strchr( client->modes, 'a' )) strcpy( client->away, DEFAULT_AWAY_MSG );
180 
181 	/* Verketten */
182 	client->next = (POINTER *)My_Clients;
183 	My_Clients = client;
184 
185 	return client;
186 } /* Client_New */
187 
188 
189 GLOBAL VOID
190 Client_Destroy( CLIENT *Client, CHAR *LogMsg, CHAR *FwdMsg, BOOLEAN SendQuit )
191 {
192 	/* Client entfernen. */
193 	
194 	CLIENT *last, *c;
195 	CHAR msg[LINE_LEN], *txt;
196 
197 	assert( Client != NULL );
198 
199 	if( LogMsg ) txt = LogMsg;
200 	else txt = FwdMsg;
201 	if( ! txt ) txt = "Reason unknown.";
202 
203 	/* Netz-Split-Nachricht vorbereiten (noch nicht optimal) */
204 	if( Client->type == CLIENT_SERVER ) sprintf( msg, "%s: lost server %s", This_Server->id, Client->id );
205 
206 	last = NULL;
207 	c = My_Clients;
208 	while( c )
209 	{
210 		if(( Client->type == CLIENT_SERVER ) && ( c->introducer == Client ) && ( c != Client ))
211 		{
212 			/* der Client, der geloescht wird ist ein Server. Der Client, den wir gerade
213 			 * pruefen, ist ein Child von diesem und muss daher auch entfernt werden */
214 			Client_Destroy( c, NULL, msg, FALSE );
215 			last = NULL;
216 			c = My_Clients;
217 			continue;
218 		}
219 		if( c == Client )
220 		{
221 			/* Wir haben den Client gefunden: entfernen */
222 			if( last ) last->next = c->next;
223 			else My_Clients = (CLIENT *)c->next;
224 
225 			if( c->type == CLIENT_USER )
226 			{
227 				if( c->conn_id != NONE )
228 				{
229 					/* Ein lokaler User */
230 					Log( LOG_NOTICE, "User \"%s\" unregistered (connection %d): %s", Client_Mask( c ), c->conn_id, txt );
231 
232 					if( SendQuit )
233 					{
234 						/* Alle andere Server informieren! */
235 						if( FwdMsg ) IRC_WriteStrServersPrefix( NULL, c, "QUIT :%s", FwdMsg );
236 						else IRC_WriteStrServersPrefix( NULL, c, "QUIT :" );
237 					}
238 				}
239 				else
240 				{
241 					/* Remote User */
242 					Log( LOG_DEBUG, "User \"%s\" unregistered: %s", Client_Mask( c ), txt );
243 
244 					if( SendQuit )
245 					{
246 						/* Andere Server informieren, ausser denen, die "in
247 						 * Richtung dem liegen", auf dem der User registriert
248 						 * ist. Von denen haben wir das QUIT ja wohl bekommen. */
249 						if( FwdMsg ) IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "QUIT :%s", FwdMsg );
250 						else IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "QUIT :" );
251 					}
252 				}
253 				Channel_Quit( c, FwdMsg ? FwdMsg : c->id );
254 			}
255 			else if( c->type == CLIENT_SERVER )
256 			{
257 				if( c != This_Server )
258 				{
259 					if( c->conn_id != NONE ) Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" unregistered (connection %d): %s", c->id, c->conn_id, txt );
260 					else Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" unregistered: %s", c->id, txt );
261 				}
262 
263 				/* andere Server informieren */
264 				if( ! NGIRCd_Quit )
265 				{
266 					if( FwdMsg ) IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :%s", c->id, FwdMsg );
267 					else IRC_WriteStrServersPrefix( Client_NextHop( c ), c, "SQUIT %s :", c->id );
268 				}
269 			}
270 			else
271 			{
272 				if( c->conn_id != NONE )
273 				{
274 					if( c->id[0] ) Log( LOG_NOTICE, "Client \"%s\" unregistered (connection %d): %s", c->id, c->conn_id, txt );
275 					else Log( LOG_NOTICE, "Client unregistered (connection %d): %s", c->conn_id, txt );
276 				}
277 				else
278 				{
279 					if( c->id[0] ) Log( LOG_WARNING, "Unregistered unknown client \"%s\": %s", c->id, txt );
280 					else Log( LOG_WARNING, "Unregistered unknown client: %s", c->id, txt );
281 				}
282 			}
283 
284 			free( c );
285 			break;
286 		}
287 		last = c;
288 		c = (CLIENT *)c->next;
289 	}
290 } /* Client_Destroy */
291 
292 
293 GLOBAL VOID
294 Client_SetHostname( CLIENT *Client, CHAR *Hostname )
295 {
296 	/* Hostname eines Clients setzen */
297 	
298 	assert( Client != NULL );
299 	assert( Hostname != NULL );
300 	
301 	strncpy( Client->host, Hostname, CLIENT_HOST_LEN - 1 );
302 	Client->host[CLIENT_HOST_LEN - 1] = '\0';
303 } /* Client_SetHostname */
304 
305 
306 GLOBAL VOID
307 Client_SetID( CLIENT *Client, CHAR *ID )
308 {
309 	/* Hostname eines Clients setzen, Hash-Wert berechnen */
310 
311 	assert( Client != NULL );
312 	assert( ID != NULL );
313 	
314 	strncpy( Client->id, ID, CLIENT_ID_LEN - 1 );
315 	Client->id[CLIENT_ID_LEN - 1] = '\0';
316 
317 	/* Hash */
318 	Client->hash = Hash( Client->id );
319 } /* Client_SetID */
320 
321 
322 GLOBAL VOID
323 Client_SetUser( CLIENT *Client, CHAR *User, BOOLEAN Idented )
324 {
325 	/* Username eines Clients setzen */
326 
327 	assert( Client != NULL );
328 	assert( User != NULL );
329 	
330 	if( Idented ) strncpy( Client->user, User, CLIENT_USER_LEN - 1 );
331 	else
332 	{
333 		Client->user[0] = '~';
334 		strncpy( Client->user + 1, User, CLIENT_USER_LEN - 2 );
335 	}
336 	Client->user[CLIENT_USER_LEN - 1] = '\0';
337 } /* Client_SetUser */
338 
339 
340 GLOBAL VOID
341 Client_SetInfo( CLIENT *Client, CHAR *Info )
342 {
343 	/* Hostname eines Clients setzen */
344 
345 	assert( Client != NULL );
346 	assert( Info != NULL );
347 	
348 	strncpy( Client->info, Info, CLIENT_INFO_LEN - 1 );
349 	Client->info[CLIENT_INFO_LEN - 1] = '\0';
350 } /* Client_SetInfo */
351 
352 
353 GLOBAL VOID
354 Client_SetModes( CLIENT *Client, CHAR *Modes )
355 {
356 	/* Modes eines Clients setzen */
357 
358 	assert( Client != NULL );
359 	assert( Modes != NULL );
360 
361 	strncpy( Client->modes, Modes, CLIENT_MODE_LEN - 1 );
362 	Client->modes[CLIENT_MODE_LEN - 1] = '\0';
363 } /* Client_SetModes */
364 
365 
366 GLOBAL VOID
367 Client_SetFlags( CLIENT *Client, CHAR *Flags )
368 {
369 	/* Flags eines Clients setzen */
370 
371 	assert( Client != NULL );
372 	assert( Flags != NULL );
373 
374 	strncpy( Client->flags, Flags, CLIENT_FLAGS_LEN - 1 );
375 	Client->modes[CLIENT_FLAGS_LEN - 1] = '\0';
376 } /* Client_SetFlags */
377 
378 
379 GLOBAL VOID
380 Client_SetPassword( CLIENT *Client, CHAR *Pwd )
381 {
382 	/* Von einem Client geliefertes Passwort */
383 
384 	assert( Client != NULL );
385 	assert( Pwd != NULL );
386 	
387 	strncpy( Client->pwd, Pwd, CLIENT_PASS_LEN - 1 );
388 	Client->pwd[CLIENT_PASS_LEN - 1] = '\0';
389 } /* Client_SetPassword */
390 
391 
392 GLOBAL VOID
393 Client_SetAway( CLIENT *Client, CHAR *Txt )
394 {
395 	/* Von einem Client gelieferte AWAY-Nachricht */
396 
397 	assert( Client != NULL );
398 
399 	if( Txt )
400 	{
401 		/* Client AWAY setzen */
402 		strncpy( Client->away, Txt, CLIENT_AWAY_LEN - 1 );
403 		Client->away[CLIENT_AWAY_LEN - 1] = '\0';
404 		Client_ModeAdd( Client, 'a' );
405 		Log( LOG_DEBUG, "User \"%s\" is away: %s", Client_Mask( Client ), Txt );
406 	}
407 	else
408 	{
409 		/* AWAY loeschen */
410 		Client_ModeDel( Client, 'a' );
411 		Log( LOG_DEBUG, "User \"%s\" is no longer away.", Client_Mask( Client ));
412 	}
413 } /* Client_SetAway */
414 
415 
416 GLOBAL VOID
417 Client_SetType( CLIENT *Client, INT Type )
418 {
419 	assert( Client != NULL );
420 	Client->type = Type;
421 	if( Type == CLIENT_SERVER ) Generate_MyToken( Client );
422 } /* Client_SetType */
423 
424 
425 GLOBAL VOID
426 Client_SetHops( CLIENT *Client, INT Hops )
427 {
428 	assert( Client != NULL );
429 	Client->hops = Hops;
430 } /* Client_SetHops */
431 
432 
433 GLOBAL VOID
434 Client_SetToken( CLIENT *Client, INT Token )
435 {
436 	assert( Client != NULL );
437 	Client->token = Token;
438 } /* Client_SetToken */
439 
440 
441 GLOBAL VOID
442 Client_SetIntroducer( CLIENT *Client, CLIENT *Introducer )
443 {
444 	assert( Client != NULL );
445 	assert( Introducer != NULL );
446 	Client->introducer = Introducer;
447 } /* Client_SetIntroducer */
448 
449 
450 GLOBAL VOID
451 Client_SetOperByMe( CLIENT *Client, BOOLEAN OperByMe )
452 {
453 	assert( Client != NULL );
454 	Client->oper_by_me = OperByMe;
455 } /* Client_SetOperByMe */
456 
457 
458 GLOBAL BOOLEAN
459 Client_ModeAdd( CLIENT *Client, CHAR Mode )
460 {
461 	/* Mode soll gesetzt werden. TRUE wird geliefert, wenn der
462 	 * Mode neu gesetzt wurde, FALSE, wenn der Client den Mode
463 	 * bereits hatte. */
464 
465 	CHAR x[2];
466 	
467 	assert( Client != NULL );
468 
469 	x[0] = Mode; x[1] = '\0';
470 	if( ! strchr( Client->modes, x[0] ))
471 	{
472 		/* Client hat den Mode noch nicht -> setzen */
473 		strcat( Client->modes, x );
474 		return TRUE;
475 	}
476 	else return FALSE;
477 } /* Client_ModeAdd */
478 
479 
480 GLOBAL BOOLEAN
481 Client_ModeDel( CLIENT *Client, CHAR Mode )
482 {
483 	/* Mode soll geloescht werden. TRUE wird geliefert, wenn der
484 	* Mode entfernt wurde, FALSE, wenn der Client den Mode
485 	* ueberhaupt nicht hatte. */
486 
487 	CHAR x[2], *p;
488 
489 	assert( Client != NULL );
490 
491 	x[0] = Mode; x[1] = '\0';
492 
493 	p = strchr( Client->modes, x[0] );
494 	if( ! p ) return FALSE;
495 
496 	/* Client hat den Mode -> loeschen */
497 	while( *p )
498 	{
499 		*p = *(p + 1);
500 		p++;
501 	}
502 	return TRUE;
503 } /* Client_ModeDel */
504 
505 
506 GLOBAL CLIENT *
507 Client_GetFromConn( CONN_ID Idx )
508 {
509 	/* Client-Struktur, die zur lokalen Verbindung Idx gehoert,
510 	 * liefern. Wird keine gefunden, so wird NULL geliefert. */
511 
512 	CLIENT *c;
513 
514 	assert( Idx >= 0 );
515 	
516 	c = My_Clients;
517 	while( c )
518 	{
519 		if( c->conn_id == Idx ) return c;
520 		c = (CLIENT *)c->next;
521 	}
522 	return NULL;
523 } /* Client_GetFromConn */
524 
525 
526 GLOBAL CLIENT *
527 Client_Search( CHAR *Nick )
528 {
529 	/* Client-Struktur, die den entsprechenden Nick hat, liefern.
530 	 * Wird keine gefunden, so wird NULL geliefert. */
531 
532 	CHAR search_id[CLIENT_ID_LEN], *ptr;
533 	CLIENT *c = NULL;
534 	UINT32 search_hash;
535 
536 	assert( Nick != NULL );
537 
538 	/* Nick kopieren und ggf. Host-Mask abschneiden */
539 	strncpy( search_id, Nick, CLIENT_ID_LEN - 1 );
540 	search_id[CLIENT_ID_LEN - 1] = '\0';
541 	ptr = strchr( search_id, '!' );
542 	if( ptr ) *ptr = '\0';
543 
544 	search_hash = Hash( search_id );
545 
546 	c = My_Clients;
547 	while( c )
548 	{
549 		if( c->hash == search_hash )
550 		{
551 			/* lt. Hash-Wert: Treffer! */
552 			if( strcasecmp( c->id, search_id ) == 0 ) return c;
553 		}
554 		c = (CLIENT *)c->next;
555 	}
556 	return NULL;
557 } /* Client_Search */
558 
559 
560 GLOBAL CLIENT *
561 Client_GetFromToken( CLIENT *Client, INT Token )
562 {
563 	/* Client-Struktur, die den entsprechenden Introducer (=Client)
564 	 * und das gegebene Token hat, liefern. Wird keine gefunden,
565 	 * so wird NULL geliefert. */
566 
567 	CLIENT *c;
568 
569 	assert( Client != NULL );
570 	assert( Token > 0 );
571 
572 	c = My_Clients;
573 	while( c )
574 	{
575 		if(( c->type == CLIENT_SERVER ) && ( c->introducer == Client ) && ( c->token == Token )) return c;
576 		c = (CLIENT *)c->next;
577 	}
578 	return NULL;
579 } /* Client_GetFromToken */
580 
581 
582 GLOBAL INT
583 Client_Type( CLIENT *Client )
584 {
585 	assert( Client != NULL );
586 	return Client->type;
587 } /* Client_Type */
588 
589 
590 GLOBAL CONN_ID
591 Client_Conn( CLIENT *Client )
592 {
593 	assert( Client != NULL );
594 	return Client->conn_id;
595 } /* Client_Conn */
596 
597 
598 GLOBAL CHAR *
599 Client_ID( CLIENT *Client )
600 {
601 	assert( Client != NULL );
602 
603 #ifdef DEBUG
604 	if( Client->type == CLIENT_USER ) assert( strlen( Client->id ) < CLIENT_NICK_LEN );
605 #endif
606 						   
607 	if( Client->id[0] ) return Client->id;
608 	else return "*";
609 } /* Client_ID */
610 
611 
612 GLOBAL CHAR *
613 Client_Info( CLIENT *Client )
614 {
615 	assert( Client != NULL );
616 	return Client->info;
617 } /* Client_Info */
618 
619 
620 GLOBAL CHAR *
621 Client_User( CLIENT *Client )
622 {
623 	assert( Client != NULL );
624 	if( Client->user[0] ) return Client->user;
625 	else return "~";
626 } /* Client_User */
627 
628 
629 GLOBAL CHAR *
630 Client_Hostname( CLIENT *Client )
631 {
632 	assert( Client != NULL );
633 	return Client->host;
634 } /* Client_Hostname */
635 
636 
637 GLOBAL CHAR *
638 Client_Password( CLIENT *Client )
639 {
640 	assert( Client != NULL );
641 	return Client->pwd;
642 } /* Client_Password */
643 
644 
645 GLOBAL CHAR *
646 Client_Modes( CLIENT *Client )
647 {
648 	assert( Client != NULL );
649 	return Client->modes;
650 } /* Client_Modes */
651 
652 
653 GLOBAL CHAR *
654 Client_Flags( CLIENT *Client )
655 {
656 	assert( Client != NULL );
657 	return Client->flags;
658 } /* Client_Flags */
659 
660 
661 GLOBAL BOOLEAN
662 Client_OperByMe( CLIENT *Client )
663 {
664 	assert( Client != NULL );
665 	return Client->oper_by_me;
666 } /* Client_OperByMe */
667 
668 
669 GLOBAL INT
670 Client_Hops( CLIENT *Client )
671 {
672 	assert( Client != NULL );
673 	return Client->hops;
674 } /* Client_Hops */
675 
676 
677 GLOBAL INT
678 Client_Token( CLIENT *Client )
679 {
680 	assert( Client != NULL );
681 	return Client->token;
682 } /* Client_Token */
683 
684 
685 GLOBAL INT
686 Client_MyToken( CLIENT *Client )
687 {
688 	assert( Client != NULL );
689 	return Client->mytoken;
690 } /* Client_MyToken */
691 
692 
693 GLOBAL CLIENT *
694 Client_NextHop( CLIENT *Client )
695 {
696 	CLIENT *c;
697 	
698 	assert( Client != NULL );
699 
700 	c = Client;
701 	while( c->introducer && ( c->introducer != c ) && ( c->introducer != This_Server )) c = c->introducer;
702 	return c;
703 } /* Client_NextHop */
704 
705 
706 GLOBAL CHAR *
707 Client_Mask( CLIENT *Client )
708 {
709 	/* Client-"ID" liefern, wie sie z.B. fuer
710 	 * Prefixe benoetigt wird. */
711 
712 	assert( Client != NULL );
713 	
714 	if( Client->type == CLIENT_SERVER ) return Client->id;
715 
716 	sprintf( GetID_Buffer, "%s!%s@%s", Client->id, Client->user, Client->host );
717 	return GetID_Buffer;
718 } /* Client_Mask */
719 
720 
721 GLOBAL CLIENT *
722 Client_Introducer( CLIENT *Client )
723 {
724 	assert( Client != NULL );
725 	return Client->introducer;
726 } /* Client_Introducer */
727 
728 
729 GLOBAL CLIENT *
730 Client_TopServer( CLIENT *Client )
731 {
732 	assert( Client != NULL );
733 	return Client->topserver;
734 } /* Client_TopServer */
735 
736 
737 GLOBAL BOOLEAN
738 Client_HasMode( CLIENT *Client, CHAR Mode )
739 {
740 	assert( Client != NULL );
741 	return strchr( Client->modes, Mode ) != NULL;
742 } /* Client_HasMode */
743 
744 
745 GLOBAL CHAR *
746 Client_Away( CLIENT *Client )
747 {
748 	/* AWAY-Text liefern */
749 
750 	assert( Client != NULL );
751 	return Client->away;
752 } /* Client_Away */
753 
754 
755 GLOBAL BOOLEAN
756 Client_CheckNick( CLIENT *Client, CHAR *Nick )
757 {
758 	/* Nick ueberpruefen */
759 
760 	assert( Client != NULL );
761 	assert( Nick != NULL );
762 	
763 	/* Nick ungueltig? */
764 	if( ! Client_IsValidNick( Nick ))
765 	{
766 		IRC_WriteStrClient( Client, ERR_ERRONEUSNICKNAME_MSG, Client_ID( Client ), Nick );
767 		return FALSE;
768 	}
769 
770 	/* Nick bereits vergeben? */
771 	if( Client_Search( Nick ))
772 	{
773 		/* den Nick gibt es bereits */
774 		IRC_WriteStrClient( Client, ERR_NICKNAMEINUSE_MSG, Client_ID( Client ), Nick );
775 		return FALSE;
776 	}
777 
778 	return TRUE;
779 } /* Client_CheckNick */
780 
781 
782 GLOBAL BOOLEAN
783 Client_CheckID( CLIENT *Client, CHAR *ID )
784 {
785 	/* Nick ueberpruefen */
786 
787 	CHAR str[COMMAND_LEN];
788 	CLIENT *c;
789 
790 	assert( Client != NULL );
791 	assert( Client->conn_id > NONE );
792 	assert( ID != NULL );
793 
794 	/* Nick zu lang? */
795 	if( strlen( ID ) > CLIENT_ID_LEN )
796 	{
797 		IRC_WriteStrClient( Client, ERR_ERRONEUSNICKNAME_MSG, Client_ID( Client ), ID );
798 		return FALSE;
799 	}
800 
801 	/* ID bereits vergeben? */
802 	c = My_Clients;
803 	while( c )
804 	{
805 		if( strcasecmp( c->id, ID ) == 0 )
806 		{
807 			/* die Server-ID gibt es bereits */
808 			sprintf( str, "ID \"%s\" already registered!", ID );
809 			Log( LOG_ERR, "%s (on connection %d)", str, Client->conn_id );
810 			Conn_Close( Client->conn_id, str, str, TRUE );
811 			return FALSE;
812 		}
813 		c = (CLIENT *)c->next;
814 	}
815 
816 	return TRUE;
817 } /* Client_CheckID */
818 
819 
820 GLOBAL CLIENT *
821 Client_First( VOID )
822 {
823 	/* Ersten Client liefern. */
824 
825 	return My_Clients;
826 } /* Client_First */
827 
828 
829 GLOBAL CLIENT *
830 Client_Next( CLIENT *c )
831 {
832 	/* Naechsten Client liefern. Existiert keiner,
833 	 * so wird NULL geliefert. */
834 
835 	assert( c != NULL );
836 	return (CLIENT *)c->next;
837 } /* Client_Next */
838 
839 
840 GLOBAL INT
841 Client_UserCount( VOID )
842 {
843 	return Count( CLIENT_USER );
844 } /* Client_UserCount */
845 
846 
847 GLOBAL INT
848 Client_ServiceCount( VOID )
849 {
850 	return Count( CLIENT_SERVICE );;
851 } /* Client_ServiceCount */
852 
853 
854 GLOBAL INT
855 Client_ServerCount( VOID )
856 {
857 	return Count( CLIENT_SERVER );
858 } /* Client_ServerCount */
859 
860 
861 GLOBAL INT
862 Client_MyUserCount( VOID )
863 {
864 	return MyCount( CLIENT_USER );
865 } /* Client_MyUserCount */
866 
867 
868 GLOBAL INT
869 Client_MyServiceCount( VOID )
870 {
871 	return MyCount( CLIENT_SERVICE );
872 } /* Client_MyServiceCount */
873 
874 
875 GLOBAL INT
876 Client_MyServerCount( VOID )
877 {
878 	CLIENT *c;
879 	INT cnt;
880 
881 	cnt = 0;
882 	c = My_Clients;
883 	while( c )
884 	{
885 		if(( c->type == CLIENT_SERVER ) && ( c->hops == 1 )) cnt++;
886 		c = (CLIENT *)c->next;
887 	}
888 	return cnt;
889 } /* Client_MyServerCount */
890 
891 
892 GLOBAL INT
893 Client_OperCount( VOID )
894 {
895 	CLIENT *c;
896 	INT cnt;
897 
898 	cnt = 0;
899 	c = My_Clients;
900 	while( c )
901 	{
902 		if( c && ( c->type == CLIENT_USER ) && ( strchr( c->modes, 'o' ))) cnt++;
903 		c = (CLIENT *)c->next;
904 	}
905 	return cnt;
906 } /* Client_OperCount */
907 
908 
909 GLOBAL INT
910 Client_UnknownCount( VOID )
911 {
912 	CLIENT *c;
913 	INT cnt;
914 
915 	cnt = 0;
916 	c = My_Clients;
917 	while( c )
918 	{
919 		if( c && ( c->type != CLIENT_USER ) && ( c->type != CLIENT_SERVICE ) && ( c->type != CLIENT_SERVER )) cnt++;
920 		c = (CLIENT *)c->next;
921 	}
922 	return cnt;
923 } /* Client_UnknownCount */
924 
925 
926 GLOBAL BOOLEAN
927 Client_IsValidNick( CHAR *Nick )
928 {
929 	/* Ist der Nick gueltig? */
930 
931 	CHAR *ptr, goodchars[20];
932 	
933 	assert( Nick != NULL );
934 
935 	strcpy( goodchars, ";0123456789-" );
936 
937 	if( Nick[0] == '#' ) return FALSE;
938 	if( strchr( goodchars, Nick[0] )) return FALSE;
939 	if( strlen( Nick ) >= CLIENT_NICK_LEN ) return FALSE;
940 
941 	ptr = Nick;
942 	while( *ptr )
943 	{
944 		if(( *ptr < 'A' ) && ( ! strchr( goodchars, *ptr ))) return FALSE;
945 		if(( *ptr > '}' ) && ( ! strchr( goodchars, *ptr ))) return FALSE;
946 		ptr++;
947 	}
948 	
949 	return TRUE;
950 } /* Client_IsValidNick */
951 
952 
953 LOCAL INT
954 Count( CLIENT_TYPE Type )
955 {
956 	CLIENT *c;
957 	INT cnt;
958 
959 	cnt = 0;
960 	c = My_Clients;
961 	while( c )
962 	{
963 		if( c->type == Type ) cnt++;
964 		c = (CLIENT *)c->next;
965 	}
966 	return cnt;
967 } /* Count */
968 
969 
970 LOCAL INT
971 MyCount( CLIENT_TYPE Type )
972 {
973 	CLIENT *c;
974 	INT cnt;
975 
976 	cnt = 0;
977 	c = My_Clients;
978 	while( c )
979 	{
980 		if(( c->introducer == This_Server ) && ( c->type == Type )) cnt++;
981 		c = (CLIENT *)c->next;
982 	}
983 	return cnt;
984 } /* MyCount */
985 
986 
987 LOCAL CLIENT *
988 New_Client_Struct( VOID )
989 {
990 	/* Neue CLIENT-Struktur pre-initialisieren */
991 	
992 	CLIENT *c;
993 	
994 	c = malloc( sizeof( CLIENT ));
995 	if( ! c )
996 	{
997 		Log( LOG_EMERG, "Can't allocate memory! [New_Client_Struct]" );
998 		return NULL;
999 	}
1000 
1001 	c->next = NULL;
1002 	c->hash = 0;
1003 	c->type = CLIENT_UNKNOWN;
1004 	c->conn_id = NONE;
1005 	c->introducer = NULL;
1006 	c->topserver = NULL;
1007 	strcpy( c->id, "" );
1008 	strcpy( c->pwd, "" );
1009 	strcpy( c->host, "" );
1010 	strcpy( c->user, "" );
1011 	strcpy( c->info, "" );
1012 	strcpy( c->modes, "" );
1013 	c->oper_by_me = FALSE;
1014 	c->hops = -1;
1015 	c->token = -1;
1016 	c->mytoken = -1;
1017 	strcpy( c->away, "" );
1018 	strcpy( c->flags, "" );
1019 
1020 	return c;
1021 } /* New_Client */
1022 
1023 
1024 LOCAL VOID
1025 Generate_MyToken( CLIENT *Client )
1026 {
1027 	CLIENT *c;
1028 	INT token;
1029 
1030 	c = My_Clients;
1031 	token = 2;
1032 	while( c )
1033 	{
1034 		if( c->mytoken == token )
1035 		{
1036 			/* Das Token wurde bereits vergeben */
1037 			token++;
1038 			c = My_Clients;
1039 			continue;
1040 		}
1041 		else c = (CLIENT *)c->next;
1042 	}
1043 	Client->mytoken = token;
1044 	Log( LOG_DEBUG, "Assigned token %d to server \"%s\".", token, Client->id );
1045 } /* Generate_MyToken */
1046 
1047 
1048 /* -eof- */