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 channel commands
12  */
13 
14 
15 #include "portab.h"
16 
17 static char UNUSED id[] = "$Id: irc-channel.c,v 1.30 2005/06/12 18:23:59 alex Exp $";
18 
19 #include "imp.h"
20 #include <assert.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <string.h>
24 
25 #include "defines.h"
26 #include "conn.h"
27 #include "client.h"
28 #include "channel.h"
29 #include "lists.h"
30 #include "log.h"
31 #include "match.h"
32 #include "messages.h"
33 #include "parse.h"
34 #include "irc-info.h"
35 #include "irc-write.h"
36 #include "resolve.h"
37 #include "conf.h"
38 
39 #include "exp.h"
40 #include "irc-channel.h"
41 
42 
43 GLOBAL bool
44 IRC_JOIN( CLIENT *Client, REQUEST *Req )
45 {
46 	char *channame, *key, *flags, *topic, modes[8];
47 	bool is_new_chan, is_invited, is_banned;
48 	CLIENT *target;
49 	CHANNEL *chan;
50 
51 	assert( Client != NULL );
52 	assert( Req != NULL );
53 
54 	/* Bad number of arguments? */
55 	if(( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
56 
57 	/* Who is the sender? */
58 	if( Client_Type( Client ) == CLIENT_SERVER ) target = Client_Search( Req->prefix );
59 	else target = Client;
60 	if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
61 
62 	/* Are channel keys given? */
63 	if( Req->argc > 1 ) key = Req->argv[1];
64 	else key = NULL;
65 
66 	/* Channel-Namen durchgehen */
67 	chan = NULL;
68 	channame = strtok( Req->argv[0], "," );
69 	while( channame )
70 	{
71 		chan = NULL; flags = NULL;
72 
73 		/* wird der Channel neu angelegt? */
74 		if( Channel_Search( channame )) is_new_chan = false;
75 		else is_new_chan = true;
76 
77 		/* Hat ein Server Channel-User-Modes uebergeben? */
78 		if( Client_Type( Client ) == CLIENT_SERVER )
79 		{
80 			/* Channel-Flags extrahieren */
81 			flags = strchr( channame, 0x7 );
82 			if( flags )
83 			{
84 				*flags = '\0';
85 				flags++;
86 			}
87 		}
88 
89 		/* Local client? */
90 		if( Client_Type( Client ) == CLIENT_USER )
91 		{
92 			/* Test if the user has reached his maximum channel count */
93 			if( Client_Type( Client ) == CLIENT_USER )
94 			{
95 				if(( Conf_MaxJoins > 0 ) && ( Channel_CountForUser( Client ) >= Conf_MaxJoins ))
96 				{
97 					IRC_WriteStrClient( Client, ERR_TOOMANYCHANNELS_MSG, Client_ID( Client ), channame );
98 					return CONNECTED;
99 				}
100 			}
101 
102 			/* Existiert der Channel bereits, oder wird er im Moment neu erzeugt? */
103 			if( is_new_chan )
104 			{
105 				/* Erster User im Channel: Operator-Flag setzen */
106 				flags = "o";
107 			}
108 			else
109 			{
110 				/* Existierenden Channel suchen */
111 				chan = Channel_Search( channame );
112 				assert( chan != NULL );
113 
114 				is_banned = Lists_CheckBanned( target, chan );
115 				is_invited = Lists_CheckInvited( target, chan );
116 
117 				/* Testen, ob Client gebanned ist */
118 				if(( is_banned == true) &&  ( is_invited == false ))
119 				{
120 					/* Client ist gebanned (und nicht invited): */
121 					IRC_WriteStrClient( Client, ERR_BANNEDFROMCHAN_MSG, Client_ID( Client ), channame );
122 
123 					/* Try next name, if any */
124 					channame = strtok( NULL, "," );
125 					continue;
126 				}
127 
128 				/* Ist der Channel "invite-only"? */
129 				if(( strchr( Channel_Modes( chan ), 'i' )) && ( is_invited == false ))
130 				{
131 					/* Channel ist "invite-only" und Client wurde nicht invited: */
132 					IRC_WriteStrClient( Client, ERR_INVITEONLYCHAN_MSG, Client_ID( Client ), channame );
133 
134 					/* Try next name, if any */
135 					channame = strtok( NULL, "," );
136 					continue;
137 				}
138 
139 				/* Is the channel protected by a key? */
140 				if(( strchr( Channel_Modes( chan ), 'k' )) && ( strcmp( Channel_Key( chan ), key ? key : "" ) != 0 ))
141 				{
142 					/* Bad channel key! */
143 					IRC_WriteStrClient( Client, ERR_BADCHANNELKEY_MSG, Client_ID( Client ), channame );
144 
145 					/* Try next name, if any */
146 					channame = strtok( NULL, "," );
147 					continue;
148 				}
149 
150 				/* Are there already too many members? */
151 				if(( strchr( Channel_Modes( chan ), 'l' )) && ( Channel_MaxUsers( chan ) <= Channel_MemberCount( chan )))
152 				{
153 					/* Bad channel key! */
154 					IRC_WriteStrClient( Client, ERR_CHANNELISFULL_MSG, Client_ID( Client ), channame );
155 
156 					/* Try next name, if any */
157 					channame = strtok( NULL, "," );
158 					continue;
159 				}
160 			}
161 		}
162 		else
163 		{
164 			/* Remote server: we don't need to know whether the
165 			 * client is invited or not, but we have to make sure
166 			 * that the "one shot" entries (generated by INVITE
167 			 * commands) in this list become deleted when a user
168 			 * joins a channel this way. */
169 			chan = Channel_Search( channame );
170 			if( chan != NULL ) (void)Lists_CheckInvited( target, chan );
171 		}
172 
173 		/* Channel joinen (und ggf. anlegen) */
174 		if( ! Channel_Join( target, channame ))
175 		{
176 			/* naechsten Namen ermitteln */
177 			channame = strtok( NULL, "," );
178 			continue;
179 		}
180 		if( ! chan ) chan = Channel_Search( channame );
181 		assert( chan != NULL );
182 
183 		/* Modes setzen (wenn vorhanden) */
184 		while( flags && *flags )
185 		{
186 			Channel_UserModeAdd( chan, target, *flags );
187 			flags++;
188 		}
189 
190 		/* Wenn persistenter Channel und IRC-Operator: zum Channel-OP machen */
191 		if(( strchr( Channel_Modes( chan ), 'P' )) && ( strchr( Client_Modes( target ), 'o' ))) Channel_UserModeAdd( chan, target, 'o' );
192 
193 		/* Muessen Modes an andere Server gemeldet werden? */
194 		strlcpy( &modes[1], Channel_UserModes( chan, target ), sizeof( modes ) - 1 );
195 		if( modes[1] ) modes[0] = 0x7;
196 		else modes[0] = '\0';
197 
198 		/* An andere Server weiterleiten */
199 		IRC_WriteStrServersPrefix( Client, target, "JOIN :%s%s", channame, modes );
200 
201 		/* im Channel bekannt machen */
202 		IRC_WriteStrChannelPrefix( Client, chan, target, false, "JOIN :%s", channame );
203 		if( modes[1] )
204 		{
205 			/* Modes im Channel bekannt machen */
206 			IRC_WriteStrChannelPrefix( Client, chan, target, false, "MODE %s +%s %s", channame, &modes[1], Client_ID( target ));
207 		}
208 
209 		if( Client_Type( Client ) == CLIENT_USER )
210 		{
211 			/* an Client bestaetigen */
212 			IRC_WriteStrClientPrefix( Client, target, "JOIN :%s", channame );
213 
214 			/* Topic an Client schicken */
215 			topic = Channel_Topic( chan );
216 			if( *topic ) IRC_WriteStrClient( Client, RPL_TOPIC_MSG, Client_ID( Client ), channame, topic );
217 
218 			/* Mitglieder an Client Melden */
219 			IRC_Send_NAMES( Client, chan );
220 			IRC_WriteStrClient( Client, RPL_ENDOFNAMES_MSG, Client_ID( Client ), Channel_Name( chan ));
221 		}
222 
223 		/* naechsten Namen ermitteln */
224 		channame = strtok( NULL, "," );
225 	}
226 	return CONNECTED;
227 } /* IRC_JOIN */
228 
229 
230 GLOBAL bool
231 IRC_PART( CLIENT *Client, REQUEST *Req )
232 {
233 	CLIENT *target;
234 	char *chan;
235 
236 	assert( Client != NULL );
237 	assert( Req != NULL );
238 
239 	/* Falsche Anzahl Parameter? */
240 	if(( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
241 
242 	/* Wer ist der Absender? */
243 	if( Client_Type( Client ) == CLIENT_SERVER ) target = Client_Search( Req->prefix );
244 	else target = Client;
245 	if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
246 
247 	/* Channel-Namen durchgehen */
248 	chan = strtok( Req->argv[0], "," );
249 	while( chan )
250 	{
251 		if( ! Channel_Part( target, Client, chan, Req->argc > 1 ? Req->argv[1] : Client_ID( target )))
252 		{
253 			/* naechsten Namen ermitteln */
254 			chan = strtok( NULL, "," );
255 			continue;
256 		}
257 
258 		/* naechsten Namen ermitteln */
259 		chan = strtok( NULL, "," );
260 	}
261 	return CONNECTED;
262 } /* IRC_PART */
263 
264 
265 GLOBAL bool
266 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
267 {
268 	CHANNEL *chan;
269 	CLIENT *from;
270 	char *topic;
271 
272 	assert( Client != NULL );
273 	assert( Req != NULL );
274 
275 	/* Falsche Anzahl Parameter? */
276 	if(( Req->argc < 1 ) || ( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
277 
278 	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
279 	else from = Client;
280 	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
281 
282 	/* Welcher Channel? */
283 	chan = Channel_Search( Req->argv[0] );
284 	if( ! chan ) return IRC_WriteStrClient( from, ERR_NOSUCHCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
285 
286 	/* Ist der User Mitglied in dem Channel? */
287 	if( ! Channel_IsMemberOf( chan, from )) return IRC_WriteStrClient( from, ERR_NOTONCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
288 
289 	if( Req->argc == 1 )
290 	{
291 		/* Topic erfragen */
292 		topic = Channel_Topic( chan );
293 		if( *topic ) return IRC_WriteStrClient( from, RPL_TOPIC_MSG, Client_ID( from ), Channel_Name( chan ), topic );
294 		else return IRC_WriteStrClient( from, RPL_NOTOPIC_MSG, Client_ID( from ), Channel_Name( chan ));
295 	}
296 
297 	if( strchr( Channel_Modes( chan ), 't' ))
298 	{
299 		/* Topic Lock. Ist der User ein Channel Operator? */
300 		if( ! strchr( Channel_UserModes( chan, from ), 'o' )) return IRC_WriteStrClient( from, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( from ), Channel_Name( chan ));
301 	}
302 
303 	/* Topic setzen */
304 	Channel_SetTopic( chan, Req->argv[1] );
305 	Log( LOG_DEBUG, "User \"%s\" set topic on \"%s\": %s", Client_Mask( from ), Channel_Name( chan ), Req->argv[1][0] ? Req->argv[1] : "<none>" );
306 
307 	/* im Channel bekannt machen und an Server weiterleiten */
308 	IRC_WriteStrServersPrefix( Client, from, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
309 	IRC_WriteStrChannelPrefix( Client, chan, from, false, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
310 
311 	if( Client_Type( Client ) == CLIENT_USER ) return IRC_WriteStrClientPrefix( Client, Client, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
312 	else return CONNECTED;
313 } /* IRC_TOPIC */
314 
315 
316 /**
317  * Handler for the IRC "LIST" command.
318  * This implementation handles the local case as well as the forwarding of the
319  * LIST command to other servers in the IRC network.
320  */
321 GLOBAL bool
322 IRC_LIST( CLIENT *Client, REQUEST *Req )
323 {
324 	char *pattern;
325 	CHANNEL *chan;
326 	CLIENT *from, *target;
327 
328 	assert( Client != NULL );
329 	assert( Req != NULL );
330 
331 	/* Bad number of prameters? */
332 	if( Req->argc > 2 )
333 		return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
334 			Client_ID( Client ), Req->command );
335 
336 	if( Req->argc > 0 )
337 		pattern = strtok( Req->argv[0], "," );
338 	else
339 		pattern = "*";
340 
341 	/* Get sender from prefix, if any */
342 	if( Client_Type( Client ) == CLIENT_SERVER )
343 		from = Client_Search( Req->prefix );
344 	else
345 		from = Client;
346 
347 	if( ! from )
348 		return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG,
349 				Client_ID( Client ), Req->prefix );
350 
351 	if( Req->argc == 2 )
352 	{
353 		/* Forward to other server? */
354 		target = Client_Search( Req->argv[1] );
355 		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
356 			return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG,
357 					Client_ID( Client ), Req->argv[1] );
358 
359 		if( target != Client_ThisServer( ))
360 		{
361 			/* Target is indeed an other server, forward it! */
362 			return IRC_WriteStrClientPrefix( target, from,
363 					"LIST %s :%s", Client_ID( from ),
364 					Req->argv[1] );
365 		}
366 	}
367 	
368 	while( pattern )
369 	{
370 		/* Loop through all the channels */
371 		chan = Channel_First( );
372 		while( chan )
373 		{
374 			/* Check search pattern */
375 			if( Match( pattern, Channel_Name( chan )))
376 			{
377 				/* Gotcha! */
378 				if( ! strchr( Channel_Modes( chan ), 's' ) ||
379 				    Channel_IsMemberOf( chan, from ))
380 				{
381 					if( ! IRC_WriteStrClient( from,
382 					    RPL_LIST_MSG, Client_ID( from ),
383 					    Channel_Name( chan ),
384 					    Channel_MemberCount( chan ),
385 					    Channel_Topic( chan )))
386 						return DISCONNECTED;
387 				}
388 			}
389 			chan = Channel_Next( chan );
390 		}
391 		
392 		/* Get next name ... */
393 		if( Req->argc > 0 )
394 			pattern = strtok( NULL, "," );
395 		else
396 			pattern = NULL;
397 	}
398 	
399 	return IRC_WriteStrClient( from, RPL_LISTEND_MSG, Client_ID( from ));
400 } /* IRC_LIST */
401 
402 
403 GLOBAL bool
404 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
405 {
406 	char modes_add[COMMAND_LEN], l[16], *ptr;
407 	CLIENT *from;
408 	CHANNEL *chan;
409 	int arg_topic;
410 
411 	assert( Client != NULL );
412 	assert( Req != NULL );
413 
414 	/* Bad number of parameters? */
415 	if(( Req->argc < 2 ) || ( Req->argc == 4 ) || ( Req->argc > 5 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
416 
417 	/* Compatibility kludge */
418 	if( Req->argc == 5 ) arg_topic = 4;
419 	else if( Req->argc == 3 ) arg_topic = 2;
420 	else arg_topic = -1;
421 
422 	/* Search origin */
423 	from = Client_Search( Req->prefix );
424 	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
425 
426 	/* Search or create channel */
427 	chan = Channel_Search( Req->argv[0] );
428 	if( ! chan ) chan = Channel_Create( Req->argv[0] );
429 	if( ! chan ) return CONNECTED;
430 
431 	if( Req->argv[1][0] == '+' )
432 	{
433 		ptr = Channel_Modes( chan );
434 		if( ! *ptr )
435 		{
436 			/* OK, this channel doesn't have modes jet, set the received ones: */
437 			Channel_SetModes( chan, &Req->argv[1][1] );
438 
439 			if( Req->argc == 5 )
440 			{
441 				if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
442 				if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
443 			}
444 			else
445 			{
446 				/* Delete modes which we never want to inherit */
447 				Channel_ModeDel( chan, 'l' );
448 				Channel_ModeDel( chan, 'k' );
449 			}
450 
451 			strcpy( modes_add, "" );
452 			ptr = Channel_Modes( chan );
453 			while( *ptr )
454 			{
455 				if( *ptr == 'l' )
456 				{
457 					snprintf( l, sizeof( l ), " %ld", Channel_MaxUsers( chan ));
458 					strlcat( modes_add, l, sizeof( modes_add ));
459 				}
460 				if( *ptr == 'k' )
461 				{
462 					strlcat( modes_add, " ", sizeof( modes_add ));
463 					strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
464 				}
465 	     			ptr++;
466 			}
467 			
468 			/* Inform members of this channel */
469 			IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
470 		}
471 	}
472 	else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
473 
474 	if( arg_topic > 0 )
475 	{
476 		/* We got a topic */
477 		ptr = Channel_Topic( chan );
478 		if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
479 		{
480 			/* OK, there is no topic jet */
481 			Channel_SetTopic( chan, Req->argv[arg_topic] );
482 			IRC_WriteStrChannelPrefix( Client, chan, from, false, "TOPIC %s :%s", Req->argv[0], Channel_Topic( chan ));
483 		}
484 	}
485 
486 	/* Forward CHANINFO to other serevrs */
487 	if( Req->argc == 5 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2], Req->argv[3], Req->argv[4] );
488 	else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
489 	else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
490 
491 	return CONNECTED;
492 } /* IRC_CHANINFO */
493 
494 
495 /* -eof- */