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source: protocols/jabber/io.c @ fcfd9c5

Last change on this file since fcfd9c5 was b5c8a34, checked in by Wilmer van der Gaast <wilmer@…>, at 2008-01-24T22:49:47Z
Keeping track of valid Jabber connections so _connected() events will be ignored if the connection's dead already. Necessary if using GLib for event handling for now. :-/
Property mode set to `100644`
File size: 16.0 KB

Line
1	/***************************************************************************\
2	* *
3	* BitlBee - An IRC to IM gateway *
4	* Jabber module - I/O stuff (plain, SSL), queues, etc *
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 "jabber.h"
25	#include "ssl_client.h"
26
27	static gboolean jabber_write_callback( gpointer data, gint fd, b_input_condition cond );
28	static gboolean jabber_write_queue( struct im_connection *ic );
29
30	int jabber_write_packet( struct im_connection ic, struct xt_node node )
31	{
32	char *buf;
33	int st;
34
35	buf = xt_to_string( node );
36	st = jabber_write( ic, buf, strlen( buf ) );
37	g_free( buf );
38
39	return st;
40	}
41
42	int jabber_write( struct im_connection ic, char buf, int len )
43	{
44	struct jabber_data *jd = ic->proto_data;
45	gboolean ret;
46
47	if( jd->flags & JFLAG_XMLCONSOLE )
48	{
49	char *msg;
50
51	msg = g_strdup_printf( "TX: %s", buf );
52	imcb_buddy_msg( ic, JABBER_XMLCONSOLE_HANDLE, msg, 0, 0 );
53	g_free( msg );
54	}
55
56	if( jd->tx_len == 0 )
57	{
58	/* If the queue is empty, allocate a new buffer. */
59	jd->tx_len = len;
60	jd->txq = g_memdup( buf, len );
61
62	/* Try if we can write it immediately so we don't have to do
63	it via the event handler. If not, add the handler. (In
64	most cases it probably won't be necessary.) */
65	if( ( ret = jabber_write_queue( ic ) ) && jd->tx_len > 0 )
66	jd->w_inpa = b_input_add( jd->fd, GAIM_INPUT_WRITE, jabber_write_callback, ic );
67	}
68	else
69	{
70	/* Just add it to the buffer if it's already filled. The
71	event handler is already set. */
72	jd->txq = g_renew( char, jd->txq, jd->tx_len + len );
73	memcpy( jd->txq + jd->tx_len, buf, len );
74	jd->tx_len += len;
75
76	/* The return value for write() doesn't necessarily mean
77	that everything got sent, it mainly means that the
78	connection (officially) still exists and can still
79	be accessed without hitting SIGSEGV. IOW: */
80	ret = TRUE;
81	}
82
83	return ret;
84	}
85
86	/* Splitting up in two separate functions: One to use as a callback and one
87	to use in the function above to escape from having to wait for the event
88	handler to call us, if possible.
89
90	Two different functions are necessary because of the return values: The
91	callback should only return TRUE if the write was successful AND if the
92	buffer is not empty yet (ie. if the handler has to be called again when
93	the socket is ready for more data). */
94	static gboolean jabber_write_callback( gpointer data, gint fd, b_input_condition cond )
95	{
96	struct jabber_data jd = ((struct im_connection )data)->proto_data;
97
98	return jd->fd != -1 &&
99	jabber_write_queue( data ) &&
100	jd->tx_len > 0;
101	}
102
103	static gboolean jabber_write_queue( struct im_connection *ic )
104	{
105	struct jabber_data *jd = ic->proto_data;
106	int st;
107
108	if( jd->ssl )
109	st = ssl_write( jd->ssl, jd->txq, jd->tx_len );
110	else
111	st = write( jd->fd, jd->txq, jd->tx_len );
112
113	if( st == jd->tx_len )
114	{
115	/* We wrote everything, clear the buffer. */
116	g_free( jd->txq );
117	jd->txq = NULL;
118	jd->tx_len = 0;
119
120	return TRUE;
121	}
122	else if( st == 0 \|\| ( st < 0 && !ssl_sockerr_again( jd->ssl ) ) )
123	{
124	/* Set fd to -1 to make sure we won't write to it anymore. */
125	closesocket( jd->fd ); /* Shouldn't be necessary after errors? */
126	jd->fd = -1;
127
128	imcb_error( ic, "Short write() to server" );
129	imc_logout( ic, TRUE );
130	return FALSE;
131	}
132	else if( st > 0 )
133	{
134	char *s;
135
136	s = g_memdup( jd->txq + st, jd->tx_len - st );
137	jd->tx_len -= st;
138	g_free( jd->txq );
139	jd->txq = s;
140
141	return TRUE;
142	}
143	else
144	{
145	/* Just in case we had EINPROGRESS/EAGAIN: */
146
147	return TRUE;
148	}
149	}
150
151	static gboolean jabber_read_callback( gpointer data, gint fd, b_input_condition cond )
152	{
153	struct im_connection *ic = data;
154	struct jabber_data *jd = ic->proto_data;
155	char buf[512];
156	int st;
157
158	if( jd->fd == -1 )
159	return FALSE;
160
161	if( jd->ssl )
162	st = ssl_read( jd->ssl, buf, sizeof( buf ) );
163	else
164	st = read( jd->fd, buf, sizeof( buf ) );
165
166	if( st > 0 )
167	{
168	/* Parse. */
169	if( xt_feed( jd->xt, buf, st ) < 0 )
170	{
171	imcb_error( ic, "XML stream error" );
172	imc_logout( ic, TRUE );
173	return FALSE;
174	}
175
176	/* Execute all handlers. */
177	if( !xt_handle( jd->xt, NULL, 1 ) )
178	{
179	/* Don't do anything, the handlers should have
180	aborted the connection already. */
181	return FALSE;
182	}
183
184	if( jd->flags & JFLAG_STREAM_RESTART )
185	{
186	jd->flags &= ~JFLAG_STREAM_RESTART;
187	jabber_start_stream( ic );
188	}
189
190	/* Garbage collection. */
191	xt_cleanup( jd->xt, NULL, 1 );
192
193	/* This is a bit hackish, unfortunately. Although xmltree
194	has nifty event handler stuff, it only calls handlers
195	when nodes are complete. Since the server should only
196	send an opening <stream:stream> tag, we have to check
197	this by hand. :-( */
198	if( !( jd->flags & JFLAG_STREAM_STARTED ) && jd->xt && jd->xt->root )
199	{
200	if( g_strcasecmp( jd->xt->root->name, "stream:stream" ) == 0 )
201	{
202	jd->flags \|= JFLAG_STREAM_STARTED;
203
204	/* If there's no version attribute, assume
205	this is an old server that can't do SASL
206	authentication. */
207	if( !sasl_supported( ic ) )
208	{
209	/* If there's no version= tag, we suppose
210	this server does NOT implement: XMPP 1.0,
211	SASL and TLS. */
212	if( set_getbool( &ic->acc->set, "tls" ) )
213	{
214	imcb_error( ic, "TLS is turned on for this "
215	"account, but is not supported by this server" );
216	imc_logout( ic, FALSE );
217	return FALSE;
218	}
219	else
220	{
221	return jabber_init_iq_auth( ic );
222	}
223	}
224	}
225	else
226	{
227	imcb_error( ic, "XML stream error" );
228	imc_logout( ic, TRUE );
229	return FALSE;
230	}
231	}
232	}
233	else if( st == 0 \|\| ( st < 0 && !ssl_sockerr_again( jd->ssl ) ) )
234	{
235	closesocket( jd->fd );
236	jd->fd = -1;
237
238	imcb_error( ic, "Error while reading from server" );
239	imc_logout( ic, TRUE );
240	return FALSE;
241	}
242
243	/* EAGAIN/etc or a successful read. */
244	return TRUE;
245	}
246
247	gboolean jabber_connected_plain( gpointer data, gint source, b_input_condition cond )
248	{
249	struct im_connection *ic = data;
250
251	if( g_slist_find( jabber_connections, ic ) == NULL )
252	return FALSE;
253
254	if( source == -1 )
255	{
256	imcb_error( ic, "Could not connect to server" );
257	imc_logout( ic, TRUE );
258	return FALSE;
259	}
260
261	imcb_log( ic, "Connected to server, logging in" );
262
263	return jabber_start_stream( ic );
264	}
265
266	gboolean jabber_connected_ssl( gpointer data, void *source, b_input_condition cond )
267	{
268	struct im_connection *ic = data;
269	struct jabber_data *jd;
270
271	if( g_slist_find( jabber_connections, ic ) == NULL )
272	return FALSE;
273
274	jd = ic->proto_data;
275
276	if( source == NULL )
277	{
278	/* The SSL connection will be cleaned up by the SSL lib
279	already, set it to NULL here to prevent a double cleanup: */
280	jd->ssl = NULL;
281
282	imcb_error( ic, "Could not connect to server" );
283	imc_logout( ic, TRUE );
284	return FALSE;
285	}
286
287	imcb_log( ic, "Connected to server, logging in" );
288
289	return jabber_start_stream( ic );
290	}
291
292	static xt_status jabber_end_of_stream( struct xt_node *node, gpointer data )
293	{
294	imc_logout( data, TRUE );
295	return XT_ABORT;
296	}
297
298	static xt_status jabber_pkt_features( struct xt_node *node, gpointer data )
299	{
300	struct im_connection *ic = data;
301	struct jabber_data *jd = ic->proto_data;
302	struct xt_node c, reply;
303	int trytls;
304
305	trytls = g_strcasecmp( set_getstr( &ic->acc->set, "tls" ), "try" ) == 0;
306	c = xt_find_node( node->children, "starttls" );
307	if( c && !jd->ssl )
308	{
309	/* If the server advertises the STARTTLS feature and if we're
310	not in a secure connection already: */
311
312	c = xt_find_node( c->children, "required" );
313
314	if( c && ( !trytls && !set_getbool( &ic->acc->set, "tls" ) ) )
315	{
316	imcb_error( ic, "Server requires TLS connections, but TLS is turned off for this account" );
317	imc_logout( ic, FALSE );
318
319	return XT_ABORT;
320	}
321
322	/* Only run this if the tls setting is set to true or try: */
323	if( ( trytls \|\| set_getbool( &ic->acc->set, "tls" ) ) )
324	{
325	reply = xt_new_node( "starttls", NULL, NULL );
326	xt_add_attr( reply, "xmlns", XMLNS_TLS );
327	if( !jabber_write_packet( ic, reply ) )
328	{
329	xt_free_node( reply );
330	return XT_ABORT;
331	}
332	xt_free_node( reply );
333
334	return XT_HANDLED;
335	}
336	}
337	else if( !c && !jd->ssl )
338	{
339	/* If the server does not advertise the STARTTLS feature and
340	we're not in a secure connection already: (Servers have a
341	habit of not advertising <starttls/> anymore when already
342	using SSL/TLS. */
343
344	if( !trytls && set_getbool( &ic->acc->set, "tls" ) )
345	{
346	imcb_error( ic, "TLS is turned on for this account, but is not supported by this server" );
347	imc_logout( ic, FALSE );
348
349	return XT_ABORT;
350	}
351	}
352
353	/* This one used to be in jabber_handlers[], but it has to be done
354	from here to make sure the TLS session will be initialized
355	properly before we attempt SASL authentication. */
356	if( ( c = xt_find_node( node->children, "mechanisms" ) ) )
357	{
358	if( sasl_pkt_mechanisms( c, data ) == XT_ABORT )
359	return XT_ABORT;
360	}
361	/* If the server SEEMS to support SASL authentication but doesn't
362	support it after all, we should try to do authentication the
363	other way. jabber.com doesn't seem to do SASL while it pretends
364	to be XMPP 1.0 compliant! */
365	else if( !( jd->flags & JFLAG_AUTHENTICATED ) && sasl_supported( ic ) )
366	{
367	if( !jabber_init_iq_auth( ic ) )
368	return XT_ABORT;
369	}
370
371	if( ( c = xt_find_node( node->children, "bind" ) ) )
372	{
373	reply = xt_new_node( "bind", NULL, xt_new_node( "resource", set_getstr( &ic->acc->set, "resource" ), NULL ) );
374	xt_add_attr( reply, "xmlns", XMLNS_BIND );
375	reply = jabber_make_packet( "iq", "set", NULL, reply );
376	jabber_cache_add( ic, reply, jabber_pkt_bind_sess );
377
378	if( !jabber_write_packet( ic, reply ) )
379	return XT_ABORT;
380
381	jd->flags \|= JFLAG_WAIT_BIND;
382	}
383
384	if( ( c = xt_find_node( node->children, "session" ) ) )
385	{
386	reply = xt_new_node( "session", NULL, NULL );
387	xt_add_attr( reply, "xmlns", XMLNS_SESSION );
388	reply = jabber_make_packet( "iq", "set", NULL, reply );
389	jabber_cache_add( ic, reply, jabber_pkt_bind_sess );
390
391	if( !jabber_write_packet( ic, reply ) )
392	return XT_ABORT;
393
394	jd->flags \|= JFLAG_WAIT_SESSION;
395	}
396
397	/* This flag is already set if we authenticated via SASL, so now
398	we can resume the session in the new stream, if we don't have
399	to bind/initialize the session. */
400	if( jd->flags & JFLAG_AUTHENTICATED && ( jd->flags & ( JFLAG_WAIT_BIND \| JFLAG_WAIT_SESSION ) ) == 0 )
401	{
402	if( !jabber_get_roster( ic ) )
403	return XT_ABORT;
404	}
405
406	return XT_HANDLED;
407	}
408
409	static xt_status jabber_pkt_proceed_tls( struct xt_node *node, gpointer data )
410	{
411	struct im_connection *ic = data;
412	struct jabber_data *jd = ic->proto_data;
413	char *xmlns;
414
415	xmlns = xt_find_attr( node, "xmlns" );
416
417	/* Just ignore it when it doesn't seem to be TLS-related (is that at
418	all possible??). */
419	if( !xmlns \|\| strcmp( xmlns, XMLNS_TLS ) != 0 )
420	return XT_HANDLED;
421
422	/* We don't want event handlers to touch our TLS session while it's
423	still initializing! */
424	b_event_remove( jd->r_inpa );
425	if( jd->tx_len > 0 )
426	{
427	/* Actually the write queue should be empty here, but just
428	to be sure... */
429	b_event_remove( jd->w_inpa );
430	g_free( jd->txq );
431	jd->txq = NULL;
432	jd->tx_len = 0;
433	}
434	jd->w_inpa = jd->r_inpa = 0;
435
436	imcb_log( ic, "Converting stream to TLS" );
437
438	jd->ssl = ssl_starttls( jd->fd, jabber_connected_ssl, ic );
439
440	return XT_HANDLED;
441	}
442
443	static xt_status jabber_pkt_stream_error( struct xt_node *node, gpointer data )
444	{
445	struct im_connection *ic = data;
446	int allow_reconnect = TRUE;
447	struct jabber_error *err;
448
449	err = jabber_error_parse( node, XMLNS_STREAM_ERROR );
450
451	/* Tssk... */
452	if( err->code == NULL )
453	{
454	imcb_error( ic, "Unknown stream error reported by server" );
455	imc_logout( ic, allow_reconnect );
456	jabber_error_free( err );
457	return XT_ABORT;
458	}
459
460	/* We know that this is a fatal error. If it's a "conflict" error, we
461	should turn off auto-reconnect to make sure we won't get some nasty
462	infinite loop! */
463	if( strcmp( err->code, "conflict" ) == 0 )
464	{
465	imcb_error( ic, "Account and resource used from a different location" );
466	allow_reconnect = FALSE;
467	}
468	else
469	{
470	imcb_error( ic, "Stream error: %s%s%s", err->code, err->text ? ": " : "",
471	err->text ? err->text : "" );
472	}
473
474	jabber_error_free( err );
475	imc_logout( ic, allow_reconnect );
476
477	return XT_ABORT;
478	}
479
480	static xt_status jabber_xmlconsole( struct xt_node *node, gpointer data )
481	{
482	struct im_connection *ic = data;
483	struct jabber_data *jd = ic->proto_data;
484
485	if( jd->flags & JFLAG_XMLCONSOLE )
486	{
487	char msg, pkt;
488
489	pkt = xt_to_string( node );
490	msg = g_strdup_printf( "RX: %s", pkt );
491	imcb_buddy_msg( ic, JABBER_XMLCONSOLE_HANDLE, msg, 0, 0 );
492	g_free( msg );
493	g_free( pkt );
494	}
495
496	return XT_NEXT;
497	}
498
499	static const struct xt_handler_entry jabber_handlers[] = {
500	{ NULL, "stream:stream", jabber_xmlconsole },
501	{ "stream:stream", "<root>", jabber_end_of_stream },
502	{ "message", "stream:stream", jabber_pkt_message },
503	{ "presence", "stream:stream", jabber_pkt_presence },
504	{ "iq", "stream:stream", jabber_pkt_iq },
505	{ "stream:features", "stream:stream", jabber_pkt_features },
506	{ "stream:error", "stream:stream", jabber_pkt_stream_error },
507	{ "proceed", "stream:stream", jabber_pkt_proceed_tls },
508	{ "challenge", "stream:stream", sasl_pkt_challenge },
509	{ "success", "stream:stream", sasl_pkt_result },
510	{ "failure", "stream:stream", sasl_pkt_result },
511	{ NULL, NULL, NULL }
512	};
513
514	gboolean jabber_start_stream( struct im_connection *ic )
515	{
516	struct jabber_data *jd = ic->proto_data;
517	int st;
518	char *greet;
519
520	/* We'll start our stream now, so prepare everything to receive one
521	from the server too. */
522	xt_free( jd->xt ); /* In case we're RE-starting. */
523	jd->xt = xt_new( ic );
524	jd->xt->handlers = (struct xt_handler_entry*) jabber_handlers;
525
526	if( jd->r_inpa <= 0 )
527	jd->r_inpa = b_input_add( jd->fd, GAIM_INPUT_READ, jabber_read_callback, ic );
528
529	greet = g_strdup_printf( "<?xml version='1.0' ?>"
530	"<stream:stream to=\"%s\" xmlns=\"jabber:client\" "
531	"xmlns:stream=\"http://etherx.jabber.org/streams\" version=\"1.0\">", jd->server );
532
533	st = jabber_write( ic, greet, strlen( greet ) );
534
535	g_free( greet );
536
537	return st;
538	}
539
540	void jabber_end_stream( struct im_connection *ic )
541	{
542	struct jabber_data *jd = ic->proto_data;
543
544	/* Let's only do this if the queue is currently empty, otherwise it'd
545	take too long anyway. */
546	if( jd->tx_len == 0 )
547	{
548	char eos[] = "</stream:stream>";
549	struct xt_node *node;
550	int st = 1;
551
552	if( ic->flags & OPT_LOGGED_IN )
553	{
554	node = jabber_make_packet( "presence", "unavailable", NULL, NULL );
555	st = jabber_write_packet( ic, node );
556	xt_free_node( node );
557	}
558
559	if( st )
560	jabber_write( ic, eos, strlen( eos ) );
561	}
562	}

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