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 1.31 2003/01/08 22:04:43 alex Exp $";
18 
19 #include "imp.h"
20 #include <assert.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 
25 #include "resolve.h"
26 #include "conn.h"
27 #include "conn-zip.h"
28 #include "conf.h"
29 #include "client.h"
30 #include "channel.h"
31 #include "irc-write.h"
32 #include "log.h"
33 #include "messages.h"
34 #include "parse.h"
35 #include "ngircd.h"
36 
37 #include "exp.h"
38 #include "irc-server.h"
39 
40 
41 GLOBAL BOOLEAN
42 IRC_SERVER( CLIENT *Client, REQUEST *Req )
43 {
44 	CHAR str[LINE_LEN], *ptr, *modes, *topic;
45 	CLIENT *from, *c, *cl;
46 	CL2CHAN *cl2chan;
47 	INT max_hops, i;
48 	CHANNEL *chan;
49 	BOOLEAN ok;
50 	CONN_ID con;
51 	
52 	assert( Client != NULL );
53 	assert( Req != NULL );
54 
55 	/* Fehler liefern, wenn kein lokaler Client */
56 	if( Client_Conn( Client ) <= NONE ) return IRC_WriteStrClient( Client, ERR_UNKNOWNCOMMAND_MSG, Client_ID( Client ), Req->command );
57 
58 	if( Client_Type( Client ) == CLIENT_GOTPASSSERVER )
59 	{
60 		/* Verbindung soll als Server-Server-Verbindung registriert werden */
61 		Log( LOG_DEBUG, "Connection %d: got SERVER command (new server link) ...", Client_Conn( Client ));
62 
63 		/* Falsche Anzahl Parameter? */
64 		if(( Req->argc != 2 ) && ( Req->argc != 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
65 
66 		/* Ist dieser Server bei uns konfiguriert? */
67 		for( i = 0; i < MAX_SERVERS; i++ ) if( strcasecmp( Req->argv[0], Conf_Server[i].name ) == 0 ) break;
68 		if( i >= MAX_SERVERS )
69 		{
70 			/* Server ist nicht konfiguriert! */
71 			Log( LOG_ERR, "Connection %d: Server \"%s\" not configured here!", Client_Conn( Client ), Req->argv[0] );
72 			Conn_Close( Client_Conn( Client ), NULL, "Server not configured here", TRUE );
73 			return DISCONNECTED;
74 		}
75 		if( strcmp( Client_Password( Client ), Conf_Server[i].pwd_in ) != 0 )
76 		{
77 			/* Falsches Passwort */
78 			Log( LOG_ERR, "Connection %d: Got bad password from server \"%s\"!", Client_Conn( Client ), Req->argv[0] );
79 			Conn_Close( Client_Conn( Client ), NULL, "Bad password", TRUE );
80 			return DISCONNECTED;
81 		}
82 		
83 		/* Ist ein Server mit dieser ID bereits registriert? */
84 		if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
85 
86 		/* Server-Strukturen fuellen ;-) */
87 		Client_SetID( Client, Req->argv[0] );
88 		Client_SetHops( Client, 1 );
89 		Client_SetInfo( Client, Req->argv[Req->argc - 1] );
90 
91 		/* Meldet sich der Server bei uns an (d.h., bauen nicht wir
92 		 * selber die Verbindung zu einem anderen Server auf)? */
93 		con = Client_Conn( Client );
94 		if( Client_Token( Client ) != TOKEN_OUTBOUND )
95 		{
96 			/* Eingehende Verbindung: Unseren SERVER- und PASS-Befehl senden */
97 			ok = TRUE;
98 			if( ! IRC_WriteStrClient( Client, "PASS %s %s", Conf_Server[i].pwd_out, NGIRCd_ProtoID )) ok = FALSE;
99 			else ok = IRC_WriteStrClient( Client, "SERVER %s 1 :%s", Conf_ServerName, Conf_ServerInfo );
100 			if( ! ok )
101 			{
102 				Conn_Close( con, "Unexpected server behavior!", NULL, FALSE );
103 				return DISCONNECTED;
104 			}
105 			Client_SetIntroducer( Client, Client );
106 			Client_SetToken( Client, 1 );
107 		}
108 		else
109 		{
110 			/* Ausgehende verbindung, SERVER und PASS wurden von uns bereits
111 			 * an die Gegenseite uerbermittelt */
112 			Client_SetToken( Client, atoi( Req->argv[1] ));
113 		}
114 
115 		Log( LOG_NOTICE|LOG_snotice, "Server \"%s\" registered (connection %d, 1 hop - direct link).", Client_ID( Client ), con );
116 
117 		Client_SetType( Client, CLIENT_SERVER );
118 		Conf_SetServer( i, con );
119 
120 #ifdef USE_ZLIB
121 		/* Kompression initialisieren, wenn erforderlich */
122 		if( strchr( Client_Flags( Client ), 'Z' ))
123 		{
124 			if( ! Zip_InitConn( con ))
125 			{
126 				/* Fehler! */
127 				Conn_Close( con, "Can't inizialize compression (zlib)!", NULL, FALSE );
128 				return DISCONNECTED;
129 			}
130 		}
131 #endif
132 
133 		/* maximalen Hop Count ermitteln */
134 		max_hops = 0;
135 		c = Client_First( );
136 		while( c )
137 		{
138 			if( Client_Hops( c ) > max_hops ) max_hops = Client_Hops( c );
139 			c = Client_Next( c );
140 		}
141 		
142 		/* Alle bisherigen Server dem neuen Server bekannt machen,
143 		 * die bisherigen Server ueber den neuen informierenn */
144 		for( i = 0; i < ( max_hops + 1 ); i++ )
145 		{
146 			c = Client_First( );
147 			while( c )
148 			{
149 				if(( Client_Type( c ) == CLIENT_SERVER ) && ( c != Client ) && ( c != Client_ThisServer( )) && ( Client_Hops( c ) == i ))
150 				{
151 					if( Client_Conn( c ) > NONE )
152 					{
153 						/* Dem gefundenen Server gleich den neuen
154 						 * Server bekannt machen */
155 						if( ! IRC_WriteStrClient( c, "SERVER %s %d %d :%s", Client_ID( Client ), Client_Hops( Client ) + 1, Client_MyToken( Client ), Client_Info( Client ))) return DISCONNECTED;
156 					}
157 					
158 					/* Den neuen Server ueber den alten informieren */
159 					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;
160 				}
161 				c = Client_Next( c );
162 			}
163 		}
164 
165 		/* alle User dem neuen Server bekannt machen */
166 		c = Client_First( );
167 		while( c )
168 		{
169 			if( Client_Type( c ) == CLIENT_USER )
170 			{
171 				/* User an neuen Server melden */
172 				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;
173 			}
174 			c = Client_Next( c );
175 		}
176 
177 		/* Channels dem neuen Server bekannt machen */
178 		chan = Channel_First( );
179 		while( chan )
180 		{
181 #ifdef IRCPLUS
182 			/* Send CHANINFO if the peer supports it */
183 			if( strchr( Client_Flags( Client ), 'C' ))
184 			{
185 				modes = Channel_Modes( chan );
186 				topic = Channel_Topic( chan );
187 
188 				if( *modes || *topic )
189 				{
190 					/* send CHANINFO */
191 					if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )) && ( ! *topic ))
192 					{
193 						/* "CHANINFO <chan> +<modes>" */
194 						if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s", Channel_Name( chan ), modes )) return DISCONNECTED;
195 					}
196 					else if(( ! strchr( Channel_Modes( chan ), 'k' )) && ( ! strchr( Channel_Modes( chan ), 'l' )))
197 					{
198 						/* "CHANINFO <chan> +<modes> :<topic>" */
199 						if( ! IRC_WriteStrClient( Client, "CHANINFO %s +%s :%s", Channel_Name( chan ), modes, topic )) return DISCONNECTED;
200 					}
201 					else
202 					{
203 						/* "CHANINFO <chan> +<modes> <key> <limit> :<topic>" */
204 						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;
205 					}
206 				}
207 			}
208 #endif
209 
210 			/* alle Member suchen */
211 			cl2chan = Channel_FirstMember( chan );
212 			snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
213 			while( cl2chan )
214 			{
215 				cl = Channel_GetClient( cl2chan );
216 				assert( cl != NULL );
217 
218 				/* Nick, ggf. mit Modes, anhaengen */
219 				if( str[strlen( str ) - 1] != ':' ) strlcat( str, ",", sizeof( str ));
220 				if( strchr( Channel_UserModes( chan, cl ), 'v' )) strlcat( str, "+", sizeof( str ));
221 				if( strchr( Channel_UserModes( chan, cl ), 'o' )) strlcat( str, "@", sizeof( str ));
222 				strlcat( str, Client_ID( cl ), sizeof( str ));
223 
224 				if( strlen( str ) > ( LINE_LEN - CLIENT_NICK_LEN - 8 ))
225 				{
226 					/* Zeile senden */
227 					if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
228 					snprintf( str, sizeof( str ), "NJOIN %s :", Channel_Name( chan ));
229 				}
230 				
231 				cl2chan = Channel_NextMember( chan, cl2chan );
232 			}
233 
234 			/* noch Daten da? */
235 			if( str[strlen( str ) - 1] != ':')
236 			{
237 				/* Ja; Also senden ... */
238 				if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
239 			}
240 
241 			/* naechsten Channel suchen */
242 			chan = Channel_Next( chan );
243 		}
244 		
245 		return CONNECTED;
246 	}
247 	else if( Client_Type( Client ) == CLIENT_SERVER )
248 	{
249 		/* Neuer Server wird im Netz angekuendigt */
250 
251 		/* Falsche Anzahl Parameter? */
252 		if( Req->argc != 4 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
253 
254 		/* Ist ein Server mit dieser ID bereits registriert? */
255 		if( ! Client_CheckID( Client, Req->argv[0] )) return DISCONNECTED;
256 
257 		/* Ueberfluessige Hostnamen aus Info-Text entfernen */
258 		ptr = strchr( Req->argv[3] + 2, '[' );
259 		if( ! ptr ) ptr = Req->argv[3];
260 
261 		from = Client_Search( Req->prefix );
262 		if( ! from )
263 		{
264 			/* Hm, Server, der diesen einfuehrt, ist nicht bekannt!? */
265 			Log( LOG_ALERT, "Unknown ID in prefix of SERVER: \"%s\"! (on connection %d)", Req->prefix, Client_Conn( Client ));
266 			Conn_Close( Client_Conn( Client ), NULL, "Unknown ID in prefix of SERVER", TRUE );
267 			return DISCONNECTED;
268 		}
269 
270 		/* Neue Client-Struktur anlegen */
271 		c = Client_NewRemoteServer( Client, Req->argv[0], from, atoi( Req->argv[1] ), atoi( Req->argv[2] ), ptr, TRUE );
272 		if( ! c )
273 		{
274 			/* Neue Client-Struktur konnte nicht angelegt werden */
275 			Log( LOG_ALERT, "Can't create client structure for server! (on connection %d)", Client_Conn( Client ));
276 			Conn_Close( Client_Conn( Client ), NULL, "Can't allocate client structure for remote server", TRUE );
277 			return DISCONNECTED;
278 		}
279 
280 		/* Log-Meldung zusammenbauen und ausgeben */
281 		if(( Client_Hops( c ) > 1 ) && ( Req->prefix[0] )) snprintf( str, sizeof( str ), "connected to %s, ", Client_ID( from ));
282 		else strcpy( str, "" );
283 		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": "" );
284 
285 		/* Andere Server informieren */
286 		IRC_WriteStrServersPrefix( Client, from, "SERVER %s %d %d :%s", Client_ID( c ), Client_Hops( c ) + 1, Client_MyToken( c ), Client_Info( c ));
287 
288 		return CONNECTED;
289 	}
290 	else return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
291 } /* IRC_SERVER */
292 
293 
294 GLOBAL BOOLEAN
295 IRC_NJOIN( CLIENT *Client, REQUEST *Req )
296 {
297 	CHAR str[COMMAND_LEN], *channame, *ptr, modes[8];
298 	BOOLEAN is_op, is_voiced;
299 	CHANNEL *chan;
300 	CLIENT *c;
301 	
302 	assert( Client != NULL );
303 	assert( Req != NULL );
304 
305 	/* Falsche Anzahl Parameter? */
306 	if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
307 
308 	strlcpy( str, Req->argv[1], sizeof( str ));
309 
310 	channame = Req->argv[0];
311 	ptr = strtok( str, "," );
312 	while( ptr )
313 	{
314 		is_op = is_voiced = FALSE;
315 		
316 		/* Prefixe abschneiden */
317 		while(( *ptr == '@' ) || ( *ptr == '+' ))
318 		{
319 			if( *ptr == '@' ) is_op = TRUE;
320 			if( *ptr == '+' ) is_voiced = TRUE;
321 			ptr++;
322 		}
323 
324 		c = Client_Search( ptr );
325 		if( c )
326 		{
327 			Channel_Join( c, channame );
328 			chan = Channel_Search( channame );
329 			assert( chan != NULL );
330 			
331 			if( is_op ) Channel_UserModeAdd( chan, c, 'o' );
332 			if( is_voiced ) Channel_UserModeAdd( chan, c, 'v' );
333 
334 			/* im Channel bekannt machen */
335 			IRC_WriteStrChannelPrefix( Client, chan, c, FALSE, "JOIN :%s", channame );
336 
337 			/* Channel-User-Modes setzen */
338 			strlcpy( modes, Channel_UserModes( chan, c ), sizeof( modes ));
339 			if( modes[0] )
340 			{
341 				/* Modes im Channel bekannt machen */
342 				IRC_WriteStrChannelPrefix( Client, chan, Client, FALSE, "MODE %s +%s %s", channame, modes, Client_ID( c ));
343 			}
344 		}
345 		else Log( LOG_ERR, "Got NJOIN for unknown nick \"%s\" for channel \"%s\"!", ptr, channame );
346 		
347 		/* naechsten Nick suchen */
348 		ptr = strtok( NULL, "," );
349 	}
350 
351 	/* an andere Server weiterleiten */
352 	IRC_WriteStrServersPrefix( Client, Client_ThisServer( ), "NJOIN %s :%s", Req->argv[0], Req->argv[1] );
353 
354 	return CONNECTED;
355 } /* IRC_NJOIN */
356 
357 
358 GLOBAL BOOLEAN
359 IRC_SQUIT( CLIENT *Client, REQUEST *Req )
360 {
361 	CLIENT *target;
362 	CHAR msg[LINE_LEN + 64];
363 
364 	assert( Client != NULL );
365 	assert( Req != NULL );
366 
367 	/* Falsche Anzahl Parameter? */
368 	if( Req->argc != 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
369 
370 	Log( LOG_DEBUG, "Got SQUIT from %s for \"%s\": \"%s\" ...", Client_ID( Client ), Req->argv[0], Req->argv[1] );
371 
372 	target = Client_Search( Req->argv[0] );
373 	if( ! target )
374 	{
375 		/* Den Server kennen wir nicht (mehr), also nichts zu tun. */
376 		Log( LOG_WARNING, "Got SQUIT from %s for unknown server \"%s\"!?", Client_ID( Client ), Req->argv[0] );
377 		return CONNECTED;
378 	}
379 
380 	if( Req->argv[1][0] )
381 	{
382 		if( strlen( Req->argv[1] ) > LINE_LEN ) Req->argv[1][LINE_LEN] = '\0';
383 		snprintf( msg, sizeof( msg ), "%s (SQUIT from %s).", Req->argv[1], Client_ID( Client ));
384 	}
385 	else snprintf( msg, sizeof( msg ), "Got SQUIT from %s.", Client_ID( Client ));
386 
387 	if( Client_Conn( target ) > NONE )
388 	{
389 		/* dieser Server hat die Connection */
390 		if( Req->argv[1][0] ) Conn_Close( Client_Conn( target ), msg, Req->argv[1], TRUE );
391 		else Conn_Close( Client_Conn( target ), msg, NULL, TRUE );
392 		return DISCONNECTED;
393 	}
394 	else
395 	{
396 		/* Verbindung hielt anderer Server */
397 		Client_Destroy( target, msg, Req->argv[1], FALSE );
398 		return CONNECTED;
399 	}
400 } /* IRC_SQUIT */
401 
402 
403 /* -eof- */