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source: protocols/jabber/jabber.c @ 38ff846

Last change on this file since 38ff846 was 38ff846, checked in by Wilmer van der Gaast <wilmer@…>, at 2010-06-24T01:06:49Z
Fixed an access-after-free() bug in the Jabber keepalive + cache cleanup code.
Property mode set to `100644`
File size: 15.3 KB

Line
1	/***************************************************************************\
2	* *
3	* BitlBee - An IRC to IM gateway *
4	* Jabber module - Main file *
5	* *
6	* Copyright 2006 Wilmer van der Gaast <wilmer@gaast.net> *
7	* *
8	* This program is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This program is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License along *
19	* with this program; if not, write to the Free Software Foundation, Inc., *
20	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
21	* *
22	\***************************************************************************/
23
24	#include <glib.h>
25	#include <string.h>
26	#include <unistd.h>
27	#include <ctype.h>
28	#include <stdio.h>
29
30	#include "ssl_client.h"
31	#include "xmltree.h"
32	#include "bitlbee.h"
33	#include "jabber.h"
34	#include "md5.h"
35
36	GSList *jabber_connections;
37
38	/* First enty is the default */
39	static const int jabber_port_list[] = {
40	5222,
41	5223,
42	5220,
43	5221,
44	5224,
45	5225,
46	5226,
47	5227,
48	5228,
49	5229,
50	80,
51	443,
52	0
53	};
54
55	static void jabber_init( account_t *acc )
56	{
57	set_t *s;
58	char str[16];
59
60	s = set_add( &acc->set, "activity_timeout", "600", set_eval_int, acc );
61
62	g_snprintf( str, sizeof( str ), "%d", jabber_port_list[0] );
63	s = set_add( &acc->set, "port", str, set_eval_int, acc );
64	s->flags \|= ACC_SET_OFFLINE_ONLY;
65
66	s = set_add( &acc->set, "priority", "0", set_eval_priority, acc );
67
68	s = set_add( &acc->set, "resource", "BitlBee", NULL, acc );
69	s->flags \|= ACC_SET_OFFLINE_ONLY;
70
71	s = set_add( &acc->set, "resource_select", "activity", NULL, acc );
72
73	s = set_add( &acc->set, "server", NULL, set_eval_account, acc );
74	s->flags \|= ACC_SET_NOSAVE \| ACC_SET_OFFLINE_ONLY \| SET_NULL_OK;
75
76	s = set_add( &acc->set, "ssl", "false", set_eval_bool, acc );
77	s->flags \|= ACC_SET_OFFLINE_ONLY;
78
79	s = set_add( &acc->set, "tls", "try", set_eval_tls, acc );
80	s->flags \|= ACC_SET_OFFLINE_ONLY;
81
82	s = set_add( &acc->set, "user_agent", "BitlBee", NULL, acc );
83
84	s = set_add( &acc->set, "xmlconsole", "false", set_eval_bool, acc );
85	s->flags \|= ACC_SET_OFFLINE_ONLY;
86
87	acc->flags \|= ACC_FLAG_AWAY_MESSAGE \| ACC_FLAG_STATUS_MESSAGE;
88	}
89
90	static void jabber_generate_id_hash( struct jabber_data *jd );
91
92	static void jabber_login( account_t *acc )
93	{
94	struct im_connection *ic = imcb_new( acc );
95	struct jabber_data *jd = g_new0( struct jabber_data, 1 );
96	struct ns_srv_reply *srv = NULL;
97	char connect_to, s;
98	int i;
99
100	/* For now this is needed in the _connected() handlers if using
101	GLib event handling, to make sure we're not handling events
102	on dead connections. */
103	jabber_connections = g_slist_prepend( jabber_connections, ic );
104
105	jd->ic = ic;
106	ic->proto_data = jd;
107
108	jd->username = g_strdup( acc->user );
109	jd->server = strchr( jd->username, '@' );
110
111	jd->fd = jd->r_inpa = jd->w_inpa = -1;
112
113	if( jd->server == NULL )
114	{
115	imcb_error( ic, "Incomplete account name (format it like <username@jabberserver.name>)" );
116	imc_logout( ic, FALSE );
117	return;
118	}
119
120	/* So don't think of free()ing jd->server.. :-) */
121	*jd->server = 0;
122	jd->server ++;
123
124	if( ( s = strchr( jd->server, '/' ) ) )
125	{
126	*s = 0;
127	set_setstr( &acc->set, "resource", s + 1 );
128
129	/* Also remove the /resource from the original variable so we
130	won't have to do this again every time. */
131	s = strchr( acc->user, '/' );
132	*s = 0;
133	}
134
135	/* This code isn't really pretty. Backwards compatibility never is... */
136	s = acc->server;
137	while( s )
138	{
139	static int had_port = 0;
140
141	if( strncmp( s, "ssl", 3 ) == 0 )
142	{
143	set_setstr( &acc->set, "ssl", "true" );
144
145	/* Flush this part so that (if this was the first
146	part of the server string) acc->server gets
147	flushed. We don't want to have to do this another
148	time. :-) */
149	*s = 0;
150	s ++;
151
152	/* Only set this if the user didn't specify a custom
153	port number already... */
154	if( !had_port )
155	set_setint( &acc->set, "port", 5223 );
156	}
157	else if( isdigit( *s ) )
158	{
159	int i;
160
161	/* The first character is a digit. It could be an
162	IP address though. Only accept this as a port#
163	if there are only digits. */
164	for( i = 0; isdigit( s[i] ); i ++ );
165
166	/* If the first non-digit character is a colon or
167	the end of the string, save the port number
168	where it should be. */
169	if( s[i] == ':' \|\| s[i] == 0 )
170	{
171	sscanf( s, "%d", &i );
172	set_setint( &acc->set, "port", i );
173
174	/* See above. */
175	*s = 0;
176	s ++;
177	}
178
179	had_port = 1;
180	}
181
182	s = strchr( s, ':' );
183	if( s )
184	{
185	*s = 0;
186	s ++;
187	}
188	}
189
190	jd->node_cache = g_hash_table_new_full( g_str_hash, g_str_equal, NULL, jabber_cache_entry_free );
191	jd->buddies = g_hash_table_new( g_str_hash, g_str_equal );
192
193	/* Figure out the hostname to connect to. */
194	if( acc->server && *acc->server )
195	connect_to = acc->server;
196	else if( ( srv = srv_lookup( "xmpp-client", "tcp", jd->server ) ) \|\|
197	( srv = srv_lookup( "jabber-client", "tcp", jd->server ) ) )
198	connect_to = srv->name;
199	else
200	connect_to = jd->server;
201
202	imcb_log( ic, "Connecting" );
203
204	for( i = 0; jabber_port_list[i] > 0; i ++ )
205	if( set_getint( &acc->set, "port" ) == jabber_port_list[i] )
206	break;
207
208	if( jabber_port_list[i] == 0 )
209	{
210	imcb_log( ic, "Illegal port number" );
211	imc_logout( ic, FALSE );
212	return;
213	}
214
215	/* For non-SSL connections we can try to use the port # from the SRV
216	reply, but let's not do that when using SSL, SSL usually runs on
217	non-standard ports... */
218	if( set_getbool( &acc->set, "ssl" ) )
219	{
220	jd->ssl = ssl_connect( connect_to, set_getint( &acc->set, "port" ), jabber_connected_ssl, ic );
221	jd->fd = jd->ssl ? ssl_getfd( jd->ssl ) : -1;
222	}
223	else
224	{
225	jd->fd = proxy_connect( connect_to, srv ? srv->port : set_getint( &acc->set, "port" ), jabber_connected_plain, ic );
226	}
227	g_free( srv );
228
229	if( jd->fd == -1 )
230	{
231	imcb_error( ic, "Could not connect to server" );
232	imc_logout( ic, TRUE );
233
234	return;
235	}
236
237	if( set_getbool( &acc->set, "xmlconsole" ) )
238	{
239	jd->flags \|= JFLAG_XMLCONSOLE;
240	/* Shouldn't really do this at this stage already, maybe. But
241	I think this shouldn't break anything. */
242	imcb_add_buddy( ic, JABBER_XMLCONSOLE_HANDLE, NULL );
243	}
244
245	jabber_generate_id_hash( jd );
246	}
247
248	/* This generates an unfinished md5_state_t variable. Every time we generate
249	an ID, we finish the state by adding a sequence number and take the hash. */
250	static void jabber_generate_id_hash( struct jabber_data *jd )
251	{
252	md5_byte_t binbuf[4];
253	char *s;
254
255	md5_init( &jd->cached_id_prefix );
256	md5_append( &jd->cached_id_prefix, (unsigned char *) jd->username, strlen( jd->username ) );
257	md5_append( &jd->cached_id_prefix, (unsigned char *) jd->server, strlen( jd->server ) );
258	s = set_getstr( &jd->ic->acc->set, "resource" );
259	md5_append( &jd->cached_id_prefix, (unsigned char *) s, strlen( s ) );
260	random_bytes( binbuf, 4 );
261	md5_append( &jd->cached_id_prefix, binbuf, 4 );
262	}
263
264	static void jabber_logout( struct im_connection *ic )
265	{
266	struct jabber_data *jd = ic->proto_data;
267
268	if( jd->fd >= 0 )
269	jabber_end_stream( ic );
270
271	while( ic->groupchats )
272	jabber_chat_free( ic->groupchats );
273
274	if( jd->r_inpa >= 0 )
275	b_event_remove( jd->r_inpa );
276	if( jd->w_inpa >= 0 )
277	b_event_remove( jd->w_inpa );
278
279	if( jd->ssl )
280	ssl_disconnect( jd->ssl );
281	if( jd->fd >= 0 )
282	closesocket( jd->fd );
283
284	if( jd->tx_len )
285	g_free( jd->txq );
286
287	if( jd->node_cache )
288	g_hash_table_destroy( jd->node_cache );
289
290	jabber_buddy_remove_all( ic );
291
292	xt_free( jd->xt );
293
294	g_free( jd->away_message );
295	g_free( jd->username );
296	g_free( jd );
297
298	jabber_connections = g_slist_remove( jabber_connections, ic );
299	}
300
301	static int jabber_buddy_msg( struct im_connection ic, char who, char *message, int flags )
302	{
303	struct jabber_data *jd = ic->proto_data;
304	struct jabber_buddy *bud;
305	struct xt_node *node;
306	char *s;
307	int st;
308
309	if( g_strcasecmp( who, JABBER_XMLCONSOLE_HANDLE ) == 0 )
310	return jabber_write( ic, message, strlen( message ) );
311
312	if( ( s = strchr( who, '=' ) ) && jabber_chat_by_jid( ic, s + 1 ) )
313	bud = jabber_buddy_by_ext_jid( ic, who, 0 );
314	else
315	bud = jabber_buddy_by_jid( ic, who, GET_BUDDY_BARE_OK );
316
317	node = xt_new_node( "body", message, NULL );
318	node = jabber_make_packet( "message", "chat", bud ? bud->full_jid : who, node );
319
320	if( bud && ( jd->flags & JFLAG_WANT_TYPING ) &&
321	( ( bud->flags & JBFLAG_DOES_XEP85 ) \|\|
322	!( bud->flags & JBFLAG_PROBED_XEP85 ) ) )
323	{
324	struct xt_node *act;
325
326	/* If the user likes typing notification and if we don't know
327	(and didn't probe before) if this resource supports XEP85,
328	include a probe in this packet now. Also, if we know this
329	buddy does support XEP85, we have to send this <active/>
330	tag to tell that the user stopped typing (well, that's what
331	we guess when s/he pressed Enter...). */
332	act = xt_new_node( "active", NULL, NULL );
333	xt_add_attr( act, "xmlns", XMLNS_CHATSTATES );
334	xt_add_child( node, act );
335
336	/* Just make sure we do this only once. */
337	bud->flags \|= JBFLAG_PROBED_XEP85;
338	}
339
340	st = jabber_write_packet( ic, node );
341	xt_free_node( node );
342
343	return st;
344	}
345
346	static GList jabber_away_states( struct im_connection ic )
347	{
348	static GList *l = NULL;
349	int i;
350
351	if( l == NULL )
352	for( i = 0; jabber_away_state_list[i].full_name; i ++ )
353	l = g_list_append( l, (void*) jabber_away_state_list[i].full_name );
354
355	return l;
356	}
357
358	static void jabber_get_info( struct im_connection ic, char who )
359	{
360	struct jabber_buddy *bud;
361
362	bud = jabber_buddy_by_jid( ic, who, GET_BUDDY_FIRST );
363
364	while( bud )
365	{
366	imcb_log( ic, "Buddy %s (%d) information:", bud->full_jid, bud->priority );
367	if( bud->away_state )
368	imcb_log( ic, "Away state: %s", bud->away_state->full_name );
369	imcb_log( ic, "Status message: %s", bud->away_message ? : "(none)" );
370
371	bud = bud->next;
372	}
373
374	jabber_get_vcard( ic, bud ? bud->full_jid : who );
375	}
376
377	static void jabber_set_away( struct im_connection ic, char state_txt, char *message )
378	{
379	struct jabber_data *jd = ic->proto_data;
380
381	/* state_txt == NULL -> Not away.
382	Unknown state -> fall back to the first defined away state. */
383	jd->away_state = state_txt ? jabber_away_state_by_name( state_txt )
384	? : jabber_away_state_list : NULL;
385
386	g_free( jd->away_message );
387	jd->away_message = ( message && *message ) ? g_strdup( message ) : NULL;
388
389	presence_send_update( ic );
390	}
391
392	static void jabber_add_buddy( struct im_connection ic, char who, char *group )
393	{
394	struct jabber_data *jd = ic->proto_data;
395
396	if( g_strcasecmp( who, JABBER_XMLCONSOLE_HANDLE ) == 0 )
397	{
398	jd->flags \|= JFLAG_XMLCONSOLE;
399	imcb_add_buddy( ic, JABBER_XMLCONSOLE_HANDLE, NULL );
400	return;
401	}
402
403	if( jabber_add_to_roster( ic, who, NULL ) )
404	presence_send_request( ic, who, "subscribe" );
405	}
406
407	static void jabber_remove_buddy( struct im_connection ic, char who, char *group )
408	{
409	struct jabber_data *jd = ic->proto_data;
410
411	if( g_strcasecmp( who, JABBER_XMLCONSOLE_HANDLE ) == 0 )
412	{
413	jd->flags &= ~JFLAG_XMLCONSOLE;
414	/* Not necessary for now. And for now the code isn't too
415	happy if the buddy is completely gone right after calling
416	this function already.
417	imcb_remove_buddy( ic, JABBER_XMLCONSOLE_HANDLE, NULL );
418	*/
419	return;
420	}
421
422	/* We should always do this part. Clean up our administration a little bit. */
423	jabber_buddy_remove_bare( ic, who );
424
425	if( jabber_remove_from_roster( ic, who ) )
426	presence_send_request( ic, who, "unsubscribe" );
427	}
428
429	static struct groupchat jabber_chat_join_( struct im_connection ic, const char room, const char nick, const char *password )
430	{
431	if( strchr( room, '@' ) == NULL )
432	imcb_error( ic, "Invalid room name: %s", room );
433	else if( jabber_chat_by_jid( ic, room ) )
434	imcb_error( ic, "Already present in chat `%s'", room );
435	else
436	return jabber_chat_join( ic, room, nick, password );
437
438	return NULL;
439	}
440
441	static void jabber_chat_msg_( struct groupchat c, char message, int flags )
442	{
443	if( c && message )
444	jabber_chat_msg( c, message, flags );
445	}
446
447	static void jabber_chat_topic_( struct groupchat c, char topic )
448	{
449	if( c && topic )
450	jabber_chat_topic( c, topic );
451	}
452
453	static void jabber_chat_leave_( struct groupchat *c )
454	{
455	if( c )
456	jabber_chat_leave( c, NULL );
457	}
458
459	static void jabber_chat_invite_( struct groupchat c, char who, char *msg )
460	{
461	struct jabber_chat *jc = c->data;
462	gchar *msg_alt = NULL;
463
464	if( msg == NULL )
465	msg_alt = g_strdup_printf( "%s invited you to %s", c->ic->acc->user, jc->name );
466
467	if( c && who )
468	jabber_chat_invite( c, who, msg ? msg : msg_alt );
469
470	g_free( msg_alt );
471	}
472
473	static void jabber_keepalive( struct im_connection *ic )
474	{
475	/* Just any whitespace character is enough as a keepalive for XMPP sessions. */
476	if( !jabber_write( ic, "\n", 1 ) )
477	return;
478
479	/* This runs the garbage collection every minute, which means every packet
480	is in the cache for about a minute (which should be enough AFAIK). */
481	jabber_cache_clean( ic );
482	}
483
484	static int jabber_send_typing( struct im_connection ic, char who, int typing )
485	{
486	struct jabber_data *jd = ic->proto_data;
487	struct jabber_buddy *bud;
488
489	/* Enable typing notification related code from now. */
490	jd->flags \|= JFLAG_WANT_TYPING;
491
492	if( ( bud = jabber_buddy_by_jid( ic, who, 0 ) ) == NULL )
493	{
494	/* Sending typing notifications to unknown buddies is
495	unsupported for now. Shouldn't be a problem, I think. */
496	return 0;
497	}
498
499	if( bud->flags & JBFLAG_DOES_XEP85 )
500	{
501	/* We're only allowed to send this stuff if we know the other
502	side supports it. */
503
504	struct xt_node *node;
505	char *type;
506	int st;
507
508	if( typing & OPT_TYPING )
509	type = "composing";
510	else if( typing & OPT_THINKING )
511	type = "paused";
512	else
513	type = "active";
514
515	node = xt_new_node( type, NULL, NULL );
516	xt_add_attr( node, "xmlns", XMLNS_CHATSTATES );
517	node = jabber_make_packet( "message", "chat", bud->full_jid, node );
518
519	st = jabber_write_packet( ic, node );
520	xt_free_node( node );
521
522	return st;
523	}
524
525	return 1;
526	}
527
528	void jabber_initmodule()
529	{
530	struct prpl *ret = g_new0( struct prpl, 1 );
531
532	ret->name = "jabber";
533	ret->login = jabber_login;
534	ret->init = jabber_init;
535	ret->logout = jabber_logout;
536	ret->buddy_msg = jabber_buddy_msg;
537	ret->away_states = jabber_away_states;
538	ret->set_away = jabber_set_away;
539	// ret->set_info = jabber_set_info;
540	ret->get_info = jabber_get_info;
541	ret->add_buddy = jabber_add_buddy;
542	ret->remove_buddy = jabber_remove_buddy;
543	ret->chat_msg = jabber_chat_msg_;
544	ret->chat_topic = jabber_chat_topic_;
545	ret->chat_invite = jabber_chat_invite_;
546	ret->chat_leave = jabber_chat_leave_;
547	ret->chat_join = jabber_chat_join_;
548	ret->keepalive = jabber_keepalive;
549	ret->send_typing = jabber_send_typing;
550	ret->handle_cmp = g_strcasecmp;
551
552	register_protocol( ret );
553	}

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