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Date:: Tue Mar 26 23:58:34 2002 UTC
Message:: - Kommentar korrekt eingerueckt. Wow ;-)
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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: irc-login.c,v 1.11 2002/03/26 23:58:34 alex Exp $
13  *
14  * irc-login.c: Anmeldung und Abmeldung im IRC
15  */
16 
17 
18 #include "portab.h"
19 
20 #include "imp.h"
21 #include <assert.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 
26 #include "ngircd.h"
27 #include "conf.h"
28 #include "irc.h"
29 #include "irc-write.h"
30 #include "log.h"
31 #include "messages.h"
32 
33 #include "exp.h"
34 #include "irc-login.h"
35 
36 
37 LOCAL BOOLEAN Hello_User( CLIENT *Client );
38 LOCAL VOID Kill_Nick( CHAR *Nick, CHAR *Reason );
39 
40 
41 GLOBAL BOOLEAN IRC_PASS( CLIENT *Client, REQUEST *Req )
42 {
43 	assert( Client != NULL );
44 	assert( Req != NULL );
45 
46 	/* Fehler liefern, wenn kein lokaler Client */
47 	if( Client_Conn( Client ) <= NONE ) return IRC_WriteStrClient( Client, ERR_UNKNOWNCOMMAND_MSG, Client_ID( Client ), Req->command );
48 	
49 	if(( Client_Type( Client ) == CLIENT_UNKNOWN ) && ( Req->argc == 1))
50 	{
51 		/* noch nicht registrierte unbekannte Verbindung */
52 		Log( LOG_DEBUG, "Connection %d: got PASS command ...", Client_Conn( Client ));
53 
54 		/* Passwort speichern */
55 		Client_SetPassword( Client, Req->argv[0] );
56 
57 		Client_SetType( Client, CLIENT_GOTPASS );
58 		return CONNECTED;
59 	}
60 	else if((( Client_Type( Client ) == CLIENT_UNKNOWN ) || ( Client_Type( Client ) == CLIENT_UNKNOWNSERVER )) && (( Req->argc == 3 ) || ( Req->argc == 4 )))
61 	{
62 		/* noch nicht registrierte Server-Verbindung */
63 		Log( LOG_DEBUG, "Connection %d: got PASS command (new server link) ...", Client_Conn( Client ));
64 
65 		/* Passwort speichern */
66 		Client_SetPassword( Client, Req->argv[0] );
67 
68 		Client_SetType( Client, CLIENT_GOTPASSSERVER );
69 		return CONNECTED;
70 	}
71 	else if(( Client_Type( Client ) == CLIENT_UNKNOWN  ) || ( Client_Type( Client ) == CLIENT_UNKNOWNSERVER ))
72 	{
73 		/* Falsche Anzahl Parameter? */
74 		return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
75 	}
76 	else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
77 } /* IRC_PASS */
78 
79 
80 GLOBAL BOOLEAN IRC_NICK( CLIENT *Client, REQUEST *Req )
81 {
82 	CLIENT *intr_c, *target, *c;
83 	CHAR *modes;
84 
85 	assert( Client != NULL );
86 	assert( Req != NULL );
87 
88 	/* Zumindest BitchX sendet NICK-USER in der falschen Reihenfolge. */
89 #ifndef STRICT_RFC
90 	if( Client_Type( Client ) == CLIENT_UNKNOWN || Client_Type( Client ) == CLIENT_GOTPASS || Client_Type( Client ) == CLIENT_GOTNICK || Client_Type( Client ) == CLIENT_GOTUSER || Client_Type( Client ) == CLIENT_USER || ( Client_Type( Client ) == CLIENT_SERVER && Req->argc == 1 ))
91 #else
92 	if( Client_Type( Client ) == CLIENT_UNKNOWN || Client_Type( Client ) == CLIENT_GOTPASS || Client_Type( Client ) == CLIENT_GOTNICK || Client_Type( Client ) == CLIENT_USER || ( Client_Type( Client ) == CLIENT_SERVER && Req->argc == 1 ))
93 #endif
94 	{
95 		/* User-Registrierung bzw. Nick-Aenderung */
96 
97 		/* Falsche Anzahl Parameter? */
98 		if( Req->argc != 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
99 
100 		/* "Ziel-Client" ermitteln */
101 		if( Client_Type( Client ) == CLIENT_SERVER )
102 		{
103 			target = Client_Search( Req->prefix );
104 			if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->argv[0] );
105 		}
106 		else
107 		{
108 			/* Ist der Client "restricted"? */
109 			if( Client_HasMode( Client, 'r' )) return IRC_WriteStrClient( Client, ERR_RESTRICTED_MSG, Client_ID( Client ));
110 			target = Client;
111 		}
112 
113 #ifndef STRICT_RFC
114 		/* Wenn der Client zu seinem eigenen Nick wechseln will, so machen
115 		 * wir nichts. So macht es das Original und mind. Snak hat probleme,
116 		 * wenn wir es nicht so machen. Ob es so okay ist? Hm ... */
117 		if( strcmp( Client_ID( target ), Req->argv[0] ) == 0 ) return CONNECTED;
118 #endif
119 		
120 		/* pruefen, ob Nick bereits vergeben. Speziallfall: der Client
121 		 * will nur die Gross- und Kleinschreibung aendern. Das darf
122 		 * er natuerlich machen :-) */
123 		if( strcasecmp( Client_ID( target ), Req->argv[0] ) != 0 )
124 		{
125 			if( ! Client_CheckNick( target, Req->argv[0] )) return CONNECTED;
126 		}
127 
128 		if(( Client_Type( target ) != CLIENT_USER ) && ( Client_Type( target ) != CLIENT_SERVER ))
129 		{
130 			/* Neuer Client */
131 			Log( LOG_DEBUG, "Connection %d: got valid NICK command ...", Client_Conn( Client ));
132 
133 			/* Client-Nick registrieren */
134 			Client_SetID( target, Req->argv[0] );
135 
136 			/* schon ein USER da? Dann registrieren! */
137 			if( Client_Type( Client ) == CLIENT_GOTUSER ) return Hello_User( Client );
138 			else Client_SetType( Client, CLIENT_GOTNICK );
139 		}
140 		else
141 		{
142 			/* Nick-Aenderung */
143 			if( Client_Conn( target ) > NONE ) Log( LOG_INFO, "User \"%s\" changed nick (connection %d): \"%s\" -> \"%s\".", Client_Mask( target ), Client_ID( target ), Req->argv[0], Client_Conn( target ));
144 			else Log( LOG_DEBUG, "User \"%s\" changed nick: \"%s\" -> \"%s\".", Client_Mask( target ), Client_ID( target ), Req->argv[0] );
145 
146 			/* alle betroffenen User und Server ueber Nick-Aenderung informieren */
147 			if( Client_Type( Client ) == CLIENT_USER ) IRC_WriteStrClientPrefix( Client, Client, "NICK :%s", Req->argv[0] );
148 			IRC_WriteStrServersPrefix( Client, target, "NICK :%s", Req->argv[0] );
149 			IRC_WriteStrRelatedPrefix( target, target, FALSE, "NICK :%s", Req->argv[0] );
150 			
151 			/* neuen Client-Nick speichern */
152 			Client_SetID( target, Req->argv[0] );
153 		}
154 
155 		return CONNECTED;
156 	}
157 	else if( Client_Type( Client ) == CLIENT_SERVER )
158 	{
159 		/* Server fuehrt neuen Client ein */
160 
161 		/* Falsche Anzahl Parameter? */
162 		if( Req->argc != 7 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
163 
164 		/* Nick ueberpruefen */
165 		c = Client_Search( Req->argv[0] );
166 		if( c )
167 		{
168 			/* Der neue Nick ist auf diesem Server bereits registriert:
169 			 * sowohl der neue, als auch der alte Client muessen nun
170 			 * disconnectiert werden. */
171 			Log( LOG_ERR, "Server %s introduces already registered nick \"%s\"!", Client_ID( Client ), Req->argv[0] );
172 			Kill_Nick( Req->argv[0], "Nick collision" );
173 			return CONNECTED;
174 		}
175 
176 		/* Server, zu dem der Client connectiert ist, suchen */
177 		intr_c = Client_GetFromToken( Client, atoi( Req->argv[4] ));
178 		if( ! intr_c )
179 		{
180 			Log( LOG_ERR, "Server %s introduces nick \"%s\" on unknown server!?", Client_ID( Client ), Req->argv[0] );
181 			Kill_Nick( Req->argv[0], "Unknown server" );
182 			return CONNECTED;
183 		}
184 
185 		/* Neue Client-Struktur anlegen */
186 		c = Client_NewRemoteUser( intr_c, Req->argv[0], atoi( Req->argv[1] ), Req->argv[2], Req->argv[3], atoi( Req->argv[4] ), Req->argv[5] + 1, Req->argv[6], TRUE );
187 		if( ! c )
188 		{
189 			/* Eine neue Client-Struktur konnte nicht angelegt werden.
190 			 * Der Client muss disconnectiert werden, damit der Netz-
191 			 * status konsistent bleibt. */
192 			Log( LOG_ALERT, "Can't create client structure! (on connection %d)", Client_Conn( Client ));
193 			Kill_Nick( Req->argv[0], "Server error" );
194 			return CONNECTED;
195 		}
196 
197 		modes = Client_Modes( c );
198 		if( *modes ) Log( LOG_DEBUG, "User \"%s\" (+%s) registered (via %s, on %s, %d hop%s).", Client_Mask( c ), modes, Client_ID( Client ), Client_ID( intr_c ), Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
199 		else Log( LOG_DEBUG, "User \"%s\" registered (via %s, on %s, %d hop%s).", Client_Mask( c ), Client_ID( Client ), Client_ID( intr_c ), Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
200 
201 		/* Andere Server, ausser dem Introducer, informieren */
202 		IRC_WriteStrServersPrefix( Client, Client, "NICK %s %d %s %s %d %s :%s", Req->argv[0], atoi( Req->argv[1] ) + 1, Req->argv[2], Req->argv[3], Client_MyToken( intr_c ), Req->argv[5], Req->argv[6] );
203 
204 		return CONNECTED;
205 	}
206 	else return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
207 } /* IRC_NICK */
208 
209 
210 GLOBAL BOOLEAN IRC_USER( CLIENT *Client, REQUEST *Req )
211 {
212 	assert( Client != NULL );
213 	assert( Req != NULL );
214 
215 #ifndef STRICT_RFC
216 	if( Client_Type( Client ) == CLIENT_GOTNICK || Client_Type( Client ) == CLIENT_GOTPASS || Client_Type( Client ) == CLIENT_UNKNOWN )
217 #else
218 	if( Client_Type( Client ) == CLIENT_GOTNICK || Client_Type( Client ) == CLIENT_GOTPASS )
219 #endif
220 	{
221 		/* Falsche Anzahl Parameter? */
222 		if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
223 
224 		Client_SetUser( Client, Req->argv[0], FALSE );
225 		Client_SetInfo( Client, Req->argv[3] );
226 
227 		Log( LOG_DEBUG, "Connection %d: got valid USER command ...", Client_Conn( Client ));
228 		if( Client_Type( Client ) == CLIENT_GOTNICK ) return Hello_User( Client );
229 		else Client_SetType( Client, CLIENT_GOTUSER );
230 		return CONNECTED;
231 	}
232 	else if( Client_Type( Client ) == CLIENT_USER || Client_Type( Client ) == CLIENT_SERVER || Client_Type( Client ) == CLIENT_SERVICE )
233 	{
234 		return IRC_WriteStrClient( Client, ERR_ALREADYREGISTRED_MSG, Client_ID( Client ));
235 	}
236 	else return IRC_WriteStrClient( Client, ERR_NOTREGISTERED_MSG, Client_ID( Client ));
237 } /* IRC_USER */
238 
239 
240 GLOBAL BOOLEAN IRC_QUIT( CLIENT *Client, REQUEST *Req )
241 {
242 	CLIENT *target;
243 	
244 	assert( Client != NULL );
245 	assert( Req != NULL );
246 
247 	if(( Client_Type( Client ) == CLIENT_USER ) || ( Client_Type( Client ) == CLIENT_SERVICE ))
248 	{
249 		/* User / Service */
250 		
251 		/* Falsche Anzahl Parameter? */
252 		if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
253 
254 		if( Req->argc == 0 ) Conn_Close( Client_Conn( Client ), "Got QUIT command.", NULL, TRUE );
255 		else Conn_Close( Client_Conn( Client ), "Got QUIT command.", Req->argv[0], TRUE );
256 		
257 		return DISCONNECTED;
258 	}
259 	else if ( Client_Type( Client ) == CLIENT_SERVER )
260 	{
261 		/* Server */
262 
263 		/* Falsche Anzahl Parameter? */
264 		if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
265 
266 		target = Client_Search( Req->prefix );
267 		if( ! target )
268 		{
269 			/* Den Client kennen wir nicht (mehr), also nichts zu tun. */
270 			Log( LOG_WARNING, "Got QUIT from %s for unknown client!?", Client_ID( Client ));
271 			return CONNECTED;
272 		}
273 
274 		if( Req->argc == 0 ) Client_Destroy( target, "Got QUIT command.", NULL, TRUE );
275 		else Client_Destroy( target, "Got QUIT command.", Req->argv[0], TRUE );
276 
277 		return CONNECTED;
278 	}
279 	else return IRC_WriteStrClient( Client, ERR_NOTREGISTERED_MSG, Client_ID( Client ));
280 } /* IRC_QUIT */
281 
282 
283 GLOBAL BOOLEAN IRC_PING( CLIENT *Client, REQUEST *Req )
284 {
285 	CLIENT *target, *from;
286 
287 	assert( Client != NULL );
288 	assert( Req != NULL );
289 
290 	if(( Client_Type( Client ) != CLIENT_USER ) && ( Client_Type( Client ) != CLIENT_SERVER )) return IRC_WriteStrClient( Client, ERR_NOTREGISTERED_MSG, Client_ID( Client ));
291 
292 	/* Falsche Anzahl Parameter? */
293 	if( Req->argc < 1 ) return IRC_WriteStrClient( Client, ERR_NOORIGIN_MSG, Client_ID( Client ));
294 #ifdef STRICT_RFC
295 	if( Req->argc > 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
296 #endif
297 
298 	if( Req->argc > 1 )
299 	{
300 		/* es wurde ein Ziel-Client angegeben */
301 		target = Client_Search( Req->argv[1] );
302 		if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG, Client_ID( Client ), Req->argv[1] );
303 		if( target != Client_ThisServer( ))
304 		{
305 			/* ok, forwarden */
306 			if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
307 			else from = Client;
308 			if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG, Client_ID( Client ), Req->prefix );
309 			return IRC_WriteStrClientPrefix( target, from, "PING %s :%s", Client_ID( from ), Req->argv[1] );
310 		}
311 	}
312 
313 	Log( LOG_DEBUG, "Connection %d: got PING, sending PONG ...", Client_Conn( Client ));
314 	return IRC_WriteStrClient( Client, "PONG %s :%s", Client_ID( Client_ThisServer( )), Client_ID( Client ));
315 } /* IRC_PING */
316 
317 
318 GLOBAL BOOLEAN IRC_PONG( CLIENT *Client, REQUEST *Req )
319 {
320 	CLIENT *target, *from;
321 
322 	assert( Client != NULL );
323 	assert( Req != NULL );
324 
325 	if(( Client_Type( Client ) != CLIENT_USER ) && ( Client_Type( Client ) != CLIENT_SERVER )) return IRC_WriteStrClient( Client, ERR_NOTREGISTERED_MSG, Client_ID( Client ));
326 
327 	/* Falsche Anzahl Parameter? */
328 	if( Req->argc < 1 ) return IRC_WriteStrClient( Client, ERR_NOORIGIN_MSG, Client_ID( Client ));
329 	if( Req->argc > 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
330 
331 	/* forwarden? */
332 	if( Req->argc == 2 )
333 	{
334 		target = Client_Search( Req->argv[1] );
335 		if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG, Client_ID( Client ), Req->argv[1] );
336 		if( target != Client_ThisServer( ))
337 		{
338 			/* ok, forwarden */
339 			if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
340 			else from = Client;
341 			if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG, Client_ID( Client ), Req->prefix );
342 			return IRC_WriteStrClientPrefix( target, from, "PONG %s :%s", Client_ID( from ), Req->argv[1] );
343 		}
344 	}
345 
346 	/* Der Connection-Timestamp wurde schon beim Lesen aus dem Socket
347 	 * aktualisiert, daher muss das hier nicht mehr gemacht werden. */
348 
349 	if( Client_Conn( Client ) > NONE ) Log( LOG_DEBUG, "Connection %d: received PONG. Lag: %ld seconds.", Client_Conn( Client ), time( NULL ) - Conn_LastPing( Client_Conn( Client )));
350 	else Log( LOG_DEBUG, "Connection %d: received PONG.", Client_Conn( Client ));
351 
352 	return CONNECTED;
353 } /* IRC_PONG */
354 
355 
356 LOCAL BOOLEAN Hello_User( CLIENT *Client )
357 {
358 	assert( Client != NULL );
359 
360 	/* Passwort ueberpruefen */
361 	if( strcmp( Client_Password( Client ), Conf_ServerPwd ) != 0 )
362 	{
363 		/* Falsches Passwort */
364 		Log( LOG_ERR, "User \"%s\" rejected (connection %d): Bad password!", Client_Mask( Client ), Client_Conn( Client ));
365 		Conn_Close( Client_Conn( Client ), NULL, "Bad password", TRUE );
366 		return DISCONNECTED;
367 	}
368 
369 	Log( LOG_NOTICE, "User \"%s\" registered (connection %d).", Client_Mask( Client ), Client_Conn( Client ));
370 
371 	/* Andere Server informieren */
372 	IRC_WriteStrServers( NULL, "NICK %s 1 %s %s 1 +%s :%s", Client_ID( Client ), Client_User( Client ), Client_Hostname( Client ), Client_Modes( Client ), Client_Info( Client ));
373 
374 	if( ! IRC_WriteStrClient( Client, RPL_WELCOME_MSG, Client_ID( Client ), Client_Mask( Client ))) return FALSE;
375 	if( ! IRC_WriteStrClient( Client, RPL_YOURHOST_MSG, Client_ID( Client ), Client_ID( Client_ThisServer( )))) return FALSE;
376 	if( ! IRC_WriteStrClient( Client, RPL_CREATED_MSG, Client_ID( Client ), NGIRCd_StartStr )) return FALSE;
377 	if( ! IRC_WriteStrClient( Client, RPL_MYINFO_MSG, Client_ID( Client ), Client_ID( Client_ThisServer( )))) return FALSE;
378 
379 	Client_SetType( Client, CLIENT_USER );
380 
381 	if( ! IRC_Send_LUSERS( Client )) return DISCONNECTED;
382 	if( ! IRC_Show_MOTD( Client )) return DISCONNECTED;
383 
384 	return CONNECTED;
385 } /* Hello_User */
386 
387 
388 LOCAL VOID Kill_Nick( CHAR *Nick, CHAR *Reason )
389 {
390 	CLIENT *c;
391 
392 	assert( Nick != NULL );
393 	assert( Reason != NULL );
394 
395 	Log( LOG_ERR, "User(s) with nick \"%s\" will be disconnected: %s", Nick, Reason );
396 
397 	/* andere Server benachrichtigen */
398 	IRC_WriteStrServers( NULL, "KILL %s :%s", Nick, Reason );
399 
400 	/* Ggf. einen eigenen Client toeten */
401 	c = Client_Search( Nick );
402 	if( c && ( Client_Conn( c ) != NONE )) Conn_Close( Client_Conn( c ), NULL, Reason, TRUE );
403 } /* Kill_Nick */
404 
405 
406 /* -eof- */