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 1.25 2003/01/08 22:04:05 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 BOOLEAN
44 IRC_JOIN( CLIENT *Client, REQUEST *Req )
45 {
46 	CHAR *channame, *key, *flags, *topic, modes[8];
47 	BOOLEAN 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 = 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 		/* Lokaler 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 
163 		/* Channel joinen (und ggf. anlegen) */
164 		if( ! Channel_Join( target, channame ))
165 		{
166 			/* naechsten Namen ermitteln */
167 			channame = strtok( NULL, "," );
168 			continue;
169 		}
170 		if( ! chan ) chan = Channel_Search( channame );
171 		assert( chan != NULL );
172 
173 		/* Modes setzen (wenn vorhanden) */
174 		while( flags && *flags )
175 		{
176 			Channel_UserModeAdd( chan, target, *flags );
177 			flags++;
178 		}
179 
180 		/* Wenn persistenter Channel und IRC-Operator: zum Channel-OP machen */
181 		if(( strchr( Channel_Modes( chan ), 'P' )) && ( strchr( Client_Modes( target ), 'o' ))) Channel_UserModeAdd( chan, target, 'o' );
182 
183 		/* Muessen Modes an andere Server gemeldet werden? */
184 		strlcpy( &modes[1], Channel_UserModes( chan, target ), sizeof( modes ) - 1 );
185 		if( modes[1] ) modes[0] = 0x7;
186 		else modes[0] = '\0';
187 
188 		/* An andere Server weiterleiten */
189 		IRC_WriteStrServersPrefix( Client, target, "JOIN :%s%s", channame, modes );
190 
191 		/* im Channel bekannt machen */
192 		IRC_WriteStrChannelPrefix( Client, chan, target, FALSE, "JOIN :%s", channame );
193 		if( modes[1] )
194 		{
195 			/* Modes im Channel bekannt machen */
196 			IRC_WriteStrChannelPrefix( Client, chan, target, FALSE, "MODE %s +%s %s", channame, &modes[1], Client_ID( target ));
197 		}
198 
199 		if( Client_Type( Client ) == CLIENT_USER )
200 		{
201 			/* an Client bestaetigen */
202 			IRC_WriteStrClientPrefix( Client, target, "JOIN :%s", channame );
203 
204 			/* Topic an Client schicken */
205 			topic = Channel_Topic( chan );
206 			if( *topic ) IRC_WriteStrClient( Client, RPL_TOPIC_MSG, Client_ID( Client ), channame, topic );
207 
208 			/* Mitglieder an Client Melden */
209 			IRC_Send_NAMES( Client, chan );
210 			IRC_WriteStrClient( Client, RPL_ENDOFNAMES_MSG, Client_ID( Client ), Channel_Name( chan ));
211 		}
212 
213 		/* naechsten Namen ermitteln */
214 		channame = strtok( NULL, "," );
215 	}
216 	return CONNECTED;
217 } /* IRC_JOIN */
218 
219 
220 GLOBAL BOOLEAN
221 IRC_PART( CLIENT *Client, REQUEST *Req )
222 {
223 	CLIENT *target;
224 	CHAR *chan;
225 
226 	assert( Client != NULL );
227 	assert( Req != NULL );
228 
229 	/* Falsche Anzahl Parameter? */
230 	if(( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
231 
232 	/* Wer ist der Absender? */
233 	if( Client_Type( Client ) == CLIENT_SERVER ) target = Client_Search( Req->prefix );
234 	else target = Client;
235 	if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
236 
237 	/* Channel-Namen durchgehen */
238 	chan = strtok( Req->argv[0], "," );
239 	while( chan )
240 	{
241 		if( ! Channel_Part( target, Client, chan, Req->argc > 1 ? Req->argv[1] : Client_ID( target )))
242 		{
243 			/* naechsten Namen ermitteln */
244 			chan = strtok( NULL, "," );
245 			continue;
246 		}
247 
248 		/* naechsten Namen ermitteln */
249 		chan = strtok( NULL, "," );
250 	}
251 	return CONNECTED;
252 } /* IRC_PART */
253 
254 
255 GLOBAL BOOLEAN
256 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
257 {
258 	CHANNEL *chan;
259 	CLIENT *from;
260 	CHAR *topic;
261 
262 	assert( Client != NULL );
263 	assert( Req != NULL );
264 
265 	/* Falsche Anzahl Parameter? */
266 	if(( Req->argc < 1 ) || ( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
267 
268 	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
269 	else from = Client;
270 	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
271 
272 	/* Welcher Channel? */
273 	chan = Channel_Search( Req->argv[0] );
274 	if( ! chan ) return IRC_WriteStrClient( from, ERR_NOSUCHCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
275 
276 	/* Ist der User Mitglied in dem Channel? */
277 	if( ! Channel_IsMemberOf( chan, from )) return IRC_WriteStrClient( from, ERR_NOTONCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
278 
279 	if( Req->argc == 1 )
280 	{
281 		/* Topic erfragen */
282 		topic = Channel_Topic( chan );
283 		if( *topic ) return IRC_WriteStrClient( from, RPL_TOPIC_MSG, Client_ID( from ), Channel_Name( chan ), topic );
284 		else return IRC_WriteStrClient( from, RPL_NOTOPIC_MSG, Client_ID( from ), Channel_Name( chan ));
285 	}
286 
287 	if( strchr( Channel_Modes( chan ), 't' ))
288 	{
289 		/* Topic Lock. Ist der User ein Channel Operator? */
290 		if( ! strchr( Channel_UserModes( chan, from ), 'o' )) return IRC_WriteStrClient( from, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( from ), Channel_Name( chan ));
291 	}
292 
293 	/* Topic setzen */
294 	Channel_SetTopic( chan, Req->argv[1] );
295 	Log( LOG_DEBUG, "User \"%s\" set topic on \"%s\": %s", Client_Mask( from ), Channel_Name( chan ), Req->argv[1][0] ? Req->argv[1] : "<none>" );
296 
297 	/* im Channel bekannt machen und an Server weiterleiten */
298 	IRC_WriteStrServersPrefix( Client, from, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
299 	IRC_WriteStrChannelPrefix( Client, chan, from, FALSE, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
300 
301 	if( Client_Type( Client ) == CLIENT_USER ) return IRC_WriteStrClientPrefix( Client, Client, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
302 	else return CONNECTED;
303 } /* IRC_TOPIC */
304 
305 
306 GLOBAL BOOLEAN
307 IRC_LIST( CLIENT *Client, REQUEST *Req )
308 {
309 	CHAR *pattern;
310 	CHANNEL *chan;
311 	CLIENT *from, *target;
312 
313 	assert( Client != NULL );
314 	assert( Req != NULL );
315 
316 	/* Falsche Anzahl Parameter? */
317 	if( Req->argc > 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
318 
319 	if( Req->argc > 0 ) pattern = strtok( Req->argv[0], "," );
320 	else pattern = "*";
321 
322 	/* From aus Prefix ermitteln */
323 	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
324 	else from = Client;
325 	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG, Client_ID( Client ), Req->prefix );
326 
327 	if( Req->argc == 2 )
328 	{
329 		/* an anderen Server forwarden */
330 		target = Client_Search( Req->argv[1] );
331 		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( Client ), Req->argv[1] );
332 
333 		if( target != Client_ThisServer( ))
334 		{
335 			/* Ok, anderer Server ist das Ziel: forwarden */
336 			return IRC_WriteStrClientPrefix( target, from, "LIST %s :%s", from, Req->argv[1] );
337 		}
338 	}
339 	
340 	while( pattern )
341 	{
342 		/* alle Channel durchgehen */
343 		chan = Channel_First( );
344 		while( chan )
345 		{
346 			/* Passt die Suchmaske auf diesen Channel? */
347 			if( Match( pattern, Channel_Name( chan )))
348 			{
349 				/* Treffer! */
350 				if( ! IRC_WriteStrClient( from, RPL_LIST_MSG, from, Channel_Name( chan ), Channel_MemberCount( chan ), Channel_Topic( chan ))) return DISCONNECTED;
351 			}
352 			chan = Channel_Next( chan );
353 		}
354 		
355 		/* naechsten Namen ermitteln */
356 		if( Req->argc > 0 ) pattern = strtok( NULL, "," );
357 		else pattern = NULL;
358 	}
359 	
360 	return IRC_WriteStrClient( from, RPL_LISTEND_MSG, from );
361 } /* IRC_LIST */
362 
363 
364 GLOBAL BOOLEAN
365 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
366 {
367 	CHAR modes_add[COMMAND_LEN], l[16], *ptr;
368 	CLIENT *from;
369 	CHANNEL *chan;
370 	INT arg_topic;
371 
372 	assert( Client != NULL );
373 	assert( Req != NULL );
374 
375 	/* Bad number of parameters? */
376 	if(( Req->argc < 2 ) || ( Req->argc == 4 ) || ( Req->argc > 5 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
377 
378 	/* Compatibility kludge */
379 	if( Req->argc == 5 ) arg_topic = 4;
380 	else if( Req->argc == 3 ) arg_topic = 2;
381 	else arg_topic = -1;
382 
383 	/* Search origin */
384 	from = Client_Search( Req->prefix );
385 	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
386 
387 	/* Search or create channel */
388 	chan = Channel_Search( Req->argv[0] );
389 	if( ! chan ) chan = Channel_Create( Req->argv[0] );
390 	if( ! chan ) return CONNECTED;
391 
392 	if( Req->argv[1][0] == '+' )
393 	{
394 		ptr = Channel_Modes( chan );
395 		if( ! *ptr )
396 		{
397 			/* OK, this channel doesn't have modes jet, set the received ones: */
398 			Channel_SetModes( chan, &Req->argv[1][1] );
399 
400 			if( Req->argc == 5 )
401 			{
402 				if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
403 				if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
404 			}
405 			else
406 			{
407 				/* Delete modes which we never want to inherit */
408 				Channel_ModeDel( chan, 'l' );
409 				Channel_ModeDel( chan, 'k' );
410 			}
411 
412 			strcpy( modes_add, "" );
413 			ptr = Channel_Modes( chan );
414 			while( *ptr )
415 			{
416 				if( *ptr == 'l' )
417 				{
418 					snprintf( l, sizeof( l ), " %ld", Channel_MaxUsers( chan ));
419 					strlcat( modes_add, l, sizeof( modes_add ));
420 				}
421 				if( *ptr == 'k' )
422 				{
423 					strlcat( modes_add, " ", sizeof( modes_add ));
424 					strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
425 				}
426 	     			ptr++;
427 			}
428 			
429 			/* Inform members of this channel */
430 			IRC_WriteStrChannelPrefix( Client, chan, from, FALSE, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
431 		}
432 	}
433 	else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
434 
435 	if( arg_topic > 0 )
436 	{
437 		/* We got a topic */
438 		ptr = Channel_Topic( chan );
439 		if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
440 		{
441 			/* OK, there is no topic jet */
442 			Channel_SetTopic( chan, Req->argv[arg_topic] );
443 			IRC_WriteStrChannelPrefix( Client, chan, from, FALSE, "TOPIC %s :%s", Req->argv[0], Channel_Topic( chan ));
444 		}
445 	}
446 
447 	/* Forward CHANINFO to other serevrs */
448 	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] );
449 	else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
450 	else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
451 
452 	return CONNECTED;
453 } /* IRC_CHANINFO */
454 
455 
456 /* -eof- */