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Date:: Tue May 11 00:01:11 2004 UTC
Message:: Fixed resolver when using IDENT lookups, cleaned up code.
Actions:: History | Blame | Raw File
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  * IRC commands for server links
12  */
13 
14 
15 #include "portab.h"
16 
17 static char UNUSED id[] = "$Id: irc-server.c,v 1.37 2004/05/11 00:01:11 alex Exp $";
18 
19 #include "imp.h"
20 #include <assert.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <strings.h>
25 
26 #include "defines.h"
27 #include "resolve.h"
28 #include "conn.h"
29 #include "conn-zip.h"
30 #include "conf.h"
31 #include "client.h"
32 #include "channel.h"
33 #include "irc-write.h"
34 #include "lists.h"
35 #include "log.h"
36 #include "messages.h"
37 #include "parse.h"
38 #include "ngircd.h"
39 
40 #include "exp.h"
41 #include "irc-server.h"
42 
43 
44 GLOBAL BOOLEAN
45 IRC_SERVER( CLIENT *Client, REQUEST *Req )
46 {
47 	CHAR str[LINE_LEN], *ptr, *modes, *topic;
48 	CLIENT *from, *c, *cl;
49 	CL2CHAN *cl2chan;
50 	INT max_hops, i;
51 	CHANNEL *chan;
52 	BOOLEAN ok;
53 	CONN_ID con;
54 	
55 	assert( Client != NULL );
56 	assert( Req != NULL );
57 
58 	/* Fehler liefern, wenn kein lokaler Client */
59 	if( Client_Conn( Client ) <= NONE ) return IRC_WriteStrClient( Client, ERR_UNKNOWNCOMMAND_MSG, Client_ID( Client ), Req->command );
60 
61 	if( Client_Type( Client ) == CLIENT_GOTPASSSERVER )
62 	{
63 		/* Verbindung soll als Server-Server-Verbindung registriert werden */
64 		Log( LOG_DEBUG, "Connection %d: got SERVER command (new server link) ...", Client_Conn( Client ));
65 
66 		/* Falsche Anzahl Parameter? */
67 		if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
68 
69 		/* Ist dieser Server bei uns konfiguriert? */
70 		for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
71 		if( i >= MAX_SERVERS )
72 		{
73 			/* Server ist nicht konfiguriert! */
74 			Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
75 			Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", TRUE );
76 			return DISCONNECTED;
77 		}
78 		if( strcmp( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
79 		{
80 			/* Falsches Passwort */
81 			Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
82 			Conn_Close( Client_Conn( Client ), NULL, "Bad password", TRUE );
83 			return DISCONNECTED;
84 		}
85 		
86 		/* Ist ein Server mit dieser ID bereits registriert? */
87 		if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
88 
89 		/* Server-Strukturen fuellen ;-) */
90 		Client_SetID( Client, Req->argv[0] );
91 		Client_SetHops( Client, 1 );
92 		Client_SetInfo( Client, Req->argv[Req->argc - 1] );
93 
94 		/* Meldet sich der Server bei uns an (d.h., bauen nicht wir
95 		 * selber die Verbindung zu einem anderen Server auf)? */
96 		con = Client_Conn( Client );
97 		if( Client_Token( Client ) != TOKEN_OUTBOUND )
98 		{
99 			/* Eingehende Verbindung: Unseren SERVER- und PASS-Befehl senden */
100 			ok = TRUE;
101 			if( ! IRC_WriteStrClient( Client, "PASS %s %s", Conf_Server[i].pwd_out, NGIRCd_ProtoID )) ok = FALSE;
102 			else ok = IRC_WriteStrClient( Client, "SERVER %s 1 :%s", Conf_ServerName, Conf_ServerInfo );
103 			if( ! ok )
104 			{
105 				Conn_Close( con, "Unexpected server behavior!", NULL, FALSE );
106 				return DISCONNECTED;
107 			}
108 			Client_SetIntroducer( Client, Client );
109 			Client_SetToken( Client, 1 );
110 		}
111 		else
112 		{
113 			/* Ausgehende verbindung, SERVER und PASS wurden von uns bereits
114 			 * an die Gegenseite uerbermittelt */
115 			Client_SetToken( Client, atoi( Req->argv[1] ));
116 		}
117 
118 		Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (connection %d, 1 hop - direct link).", Client_ID( Client ), con );
119 
120 		Client_SetType( Client, CLIENT_SERVER );
121 		Conf_SetServer( i, con );
122 
123 #ifdef ZLIB
124 		/* Kompression initialisieren, wenn erforderlich */
125 		if( strchr( Client_Flags( Client ), 'Z' ))
126 		{
127 			if( ! Zip_InitConn( con ))
128 			{
129 				/* Fehler! */
130 				Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, FALSE );
131 				return DISCONNECTED;
132 			}
133 		}
134 #endif
135 
136 		/* maximalen Hop Count ermitteln */
137 		max_hops = 0;
138 		c = Client_First( );
139 		while( c )
140 		{
141 			if( Client_Hops( c ) > max_hops ) max_hops = Client_Hops( c );
142 			c = Client_Next( c );
143 		}
144 		
145 		/* Alle bisherigen Server dem neuen Server bekannt machen,
146 		 * die bisherigen Server ueber den neuen informierenn */
147 		for( i = 0; i < ( max_hops + 1 ); i++ )
148 		{
149 			c = Client_First( );
150 			while( c )
151 			{
152 				if(( Client_Type( c ) == CLIENT_SERVER ) && ( c != Client ) && ( c != Client_ThisServer( )) && ( Client_Hops( c ) == i ))
153 				{
154 					if( Client_Conn( c ) > NONE )
155 					{
156 						/* Dem gefundenen Server gleich den neuen
157 						 * Server bekannt machen */
158 						if( ! IRC_WriteStrClient( c, "SERVER %s %d %d :%s", Client_ID( Client ), Client_Hops( Client ) + 1, Client_MyToken( Client ), Client_Info( Client ))) return DISCONNECTED;
159 					}
160 					
161 					/* Den neuen Server ueber den alten informieren */
162 					if( ! IRC_WriteStrClientPrefix( Client, Client_Hops( c ) == 1 ? Client_ThisServer( ) : Client_Introducer( c ), "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ))) return DISCONNECTED;
163 				}
164 				c = Client_Next( c );
165 			}
166 		}
167 
168 		/* alle User dem neuen Server bekannt machen */
169 		c = Client_First( );
170 		while( c )
171 		{
172 			if( Client_Type( c ) == CLIENT_USER )
173 			{
174 				/* User an neuen Server melden */
175 				if( ! IRC_WriteStrClient( Client, "NICK %s %d %s %s %d +%s :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_User( c ), Client_Hostname( c ), Client_MyToken( Client_Introducer( c )), Client_Modes( c ), Client_Info( c ))) return DISCONNECTED;
176 			}
177 			c = Client_Next( c );
178 		}
179 
180 		/* Channels dem neuen Server bekannt machen */
181 		chan = Channel_First( );
182 		while( chan )
183 		{
184 #ifdef IRCPLUS
185 			/* Send CHANINFO if the peer supports it */
186 			if( strchr( Client_Flags( Client ), 'C' ))
187 			{
188 #ifdef DEBUG
189 				Log( LOG_DEBUG, "Sending CHANINFO commands ..." );
190 #endif
191 				modes = Channel_Modes( chan );
192 				topic = Channel_Topic( chan );
193 
194 				if( *modes || *topic )
195 				{
196 					/* send CHANINFO */
197 					if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )) && ( ! *topic ))
198 					{
199 						/* "CHANINFO <chan> +<modes>" */
200 						if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s", Channel_Name( chan ), modes )) return DISCONNECTED;
201 					}
202 					else if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )))
203 					{
204 						/* "CHANINFO <chan> +<modes> :<topic>" */
205 						if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s :%s", Channel_Name( chan ), modes, topic )) return DISCONNECTED;
206 					}
207 					else
208 					{
209 						/* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
210 						if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s %s %ld :%s", Channel_Name( chan ), modes, strchr( Channel_Modes( chan ), 'k' ) ? Channel_Key( chan ) : "*", strchr( Channel_Modes( chan ), 'l' ) ? Channel_MaxUsers( chan ) : 0L, topic )) return DISCONNECTED;
211 					}
212 				}
213 			}
214 #endif
215 
216 			/* alle Member suchen */
217 			cl2chan = Channel_FirstMember( chan );
218 			snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
219 			while( cl2chan )
220 			{
221 				cl = Channel_GetClient( cl2chan );
222 				assert( cl != NULL );
223 
224 				/* Nick, ggf. mit Modes, anhaengen */
225 				if( str[strlen( str ) - 1] != ':' ) strlcat( str, ",", sizeof( str ));
226 				if( strchr( Channel_UserModes( chan, cl ), 'v' )) strlcat( str, "+", sizeof( str ));
227 				if( strchr( Channel_UserModes( chan, cl ), 'o' )) strlcat( str, "@", sizeof( str ));
228 				strlcat( str, Client_ID( cl ), sizeof( str ));
229 
230 				if( strlen( str ) > ( LINE_LEN - CLIENT_NICK_LEN - 8 ))
231 				{
232 					/* Zeile senden */
233 					if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
234 					snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
235 				}
236 				
237 				cl2chan = Channel_NextMember( chan, cl2chan );
238 			}
239 
240 			/* noch Daten da? */
241 			if( str[strlen( str ) - 1] != ':')
242 			{
243 				/* Ja; Also senden ... */
244 				if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
245 			}
246 
247 #ifdef IRCPLUS
248 			if( strchr( Client_Flags( Client ), 'L' ))
249 			{
250 #ifdef DEBUG
251 				Log( LOG_DEBUG, "Synchronizing INVITE- and BAN-lists ..." );
252 #endif
253 				/* Synchronize INVITE- and BAN-lists */
254 				if( ! Lists_SendInvites( Client )) return DISCONNECTED;
255 				if( ! Lists_SendBans( Client )) return DISCONNECTED;
256 			}
257 #endif
258 
259 			/* naechsten Channel suchen */
260 			chan = Channel_Next( chan );
261 		}
262 		
263 		return CONNECTED;
264 	}
265 	else if( Client_Type( Client ) == CLIENT_SERVER )
266 	{
267 		/* Neuer Server wird im Netz angekuendigt */
268 
269 		/* Falsche Anzahl Parameter? */
270 		if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
271 
272 		/* Ist ein Server mit dieser ID bereits registriert? */
273 		if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
274 
275 		/* Ueberfluessige Hostnamen aus Info-Text entfernen */
276 		ptr = strchr( Req->argv[3] + 2, '[' );
277 		if( ! ptr ) ptr = Req->argv[3];
278 
279 		from = Client_Search( Req->prefix );
280 		if( ! from )
281 		{
282 			/* Hm, Server, der diesen einfuehrt, ist nicht bekannt!? */
283 			Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
284 			Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", TRUE );
285 			return DISCONNECTED;
286 		}
287 
288 		/* Neue Client-Struktur anlegen */
289 		c = Client_NewRemoteServer( Client, Req->argv[0], from, atoi( Req->argv[1] ), atoi( Req->argv[2] ), ptr, TRUE );
290 		if( ! c )
291 		{
292 			/* Neue Client-Struktur konnte nicht angelegt werden */
293 			Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
294 			Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", TRUE );
295 			return DISCONNECTED;
296 		}
297 
298 		/* Log-Meldung zusammenbauen und ausgeben */
299 		if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
300 		else strcpy( str, "" );
301 		Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (via %s, %s%d hop%s).", Client_ID( c ), Client_ID( Client ), str, Client_Hops( c ), Client_Hops( c ) > 1 ? "s": "" );
302 
303 		/* Andere Server informieren */
304 		IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
305 
306 		return CONNECTED;
307 	}
308 	else return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
309 } /* IRC_SERVER */
310 
311 
312 GLOBAL BOOLEAN
313 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
314 {
315 	CHAR nick_in[COMMAND_LEN], nick_out[COMMAND_LEN], *channame, *ptr, modes[8];
316 	BOOLEAN is_op, is_voiced;
317 	CHANNEL *chan;
318 	CLIENT *c;
319 	
320 	assert( Client != NULL );
321 	assert( Req != NULL );
322 
323 	/* Falsche Anzahl Parameter? */
324 	if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
325 
326 	strlcpy( nick_in, Req->argv[1], sizeof( nick_in ));
327 	strcpy( nick_out, "" );
328 
329 	channame = Req->argv[0];
330 	ptr = strtok( nick_in, "," );
331 	while( ptr )
332 	{
333 		is_op = is_voiced = FALSE;
334 		
335 		/* Prefixe abschneiden */
336 		while(( *ptr == '@' ) || ( *ptr == '+' ))
337 		{
338 			if( *ptr == '@' ) is_op = TRUE;
339 			if( *ptr == '+' ) is_voiced = TRUE;
340 			ptr++;
341 		}
342 
343 		c = Client_Search( ptr );
344 		if( c )
345 		{
346 			Channel_Join( c, channame );
347 			chan = Channel_Search( channame );
348 			assert( chan != NULL );
349 			
350 			if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
351 			if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
352 
353 			/* im Channel bekannt machen */
354 			IRC_WriteStrChannelPrefix( Client, chan, c, FALSE, "JOIN :%s", channame );
355 
356 			/* Channel-User-Modes setzen */
357 			strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
358 			if( modes[0] )
359 			{
360 				/* Modes im Channel bekannt machen */
361 				IRC_WriteStrChannelPrefix( Client, chan, Client, FALSE, "MODE %s +%s %s", channame, modes, Client_ID( c ));
362 			}
363 
364 			if( nick_out[0] != '\0' ) strlcat( nick_out, ",", sizeof( nick_out ));
365 			if( is_op ) strlcat( nick_out, "@", sizeof( nick_out ));
366 			if( is_voiced ) strlcat( nick_out, "+", sizeof( nick_out ));
367 			strlcat( nick_out, ptr, sizeof( nick_out ));
368 		}
369 		else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
370 		
371 		/* naechsten Nick suchen */
372 		ptr = strtok( NULL, "," );
373 	}
374 
375 	/* an andere Server weiterleiten */
376 	if( nick_out[0] != '\0' ) IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], nick_out );
377 
378 	return CONNECTED;
379 } /* IRC_NJOIN */
380 
381 
382 GLOBAL BOOLEAN
383 IRC_SQUIT( CLIENT *Client, REQUEST *Req )
384 {
385 	CLIENT *target;
386 	CHAR msg[LINE_LEN + 64];
387 
388 	assert( Client != NULL );
389 	assert( Req != NULL );
390 
391 	/* Falsche Anzahl Parameter? */
392 	if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
393 
394 	Log( LOG_DEBUG, "Got SQUIT from %s for \"%s\": \"%s\" ...", Client_ID( Client ), Req->argv[0], Req->argv[1] );
395 
396 	target = Client_Search( Req->argv[0] );
397 	if( ! target )
398 	{
399 		/* Den Server kennen wir nicht (mehr), also nichts zu tun. */
400 		Log( LOG_WARNING, "Got SQUIT from %s for unknown server \"%s\"!?", Client_ID( Client ), Req->argv[0] );
401 		return CONNECTED;
402 	}
403 
404 	if( Req->argv[1][0] )
405 	{
406 		if( strlen( Req->argv[1] ) > LINE_LEN ) Req->argv[1][LINE_LEN] = '\0';
407 		snprintf( msg, sizeof( msg ), "%s (SQUIT from %s).", Req->argv[1], Client_ID( Client ));
408 	}
409 	else snprintf( msg, sizeof( msg ), "Got SQUIT from %s.", Client_ID( Client ));
410 
411 	if( Client_Conn( target ) > NONE )
412 	{
413 		/* dieser Server hat die Connection */
414 		if( Req->argv[1][0] ) Conn_Close( Client_Conn( target ), msg, Req->argv[1], TRUE );
415 		else Conn_Close( Client_Conn( target ), msg, NULL, TRUE );
416 		return DISCONNECTED;
417 	}
418 	else
419 	{
420 		/* Verbindung hielt anderer Server */
421 		Client_Destroy( target, msg, Req->argv[1], FALSE );
422 		return CONNECTED;
423 	}
424 } /* IRC_SQUIT */
425 
426 
427 /* -eof- */