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source: protocols/jabber/io.c @ 83ba3e5

Last change on this file since 83ba3e5 was d52111a, checked in by Wilmer van der Gaast <wilmer@…>, at 2007-12-12T21:36:33Z
Fixed sockerr_again() usage in Jabber module to (hopefully) fix a 100% CPU usage bug.
Property mode set to `100644`
File size: 15.9 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( source == -1 )
252	{
253	imcb_error( ic, "Could not connect to server" );
254	imc_logout( ic, TRUE );
255	return FALSE;
256	}
257
258	imcb_log( ic, "Connected to server, logging in" );
259
260	return jabber_start_stream( ic );
261	}
262
263	gboolean jabber_connected_ssl( gpointer data, void *source, b_input_condition cond )
264	{
265	struct im_connection *ic = data;
266	struct jabber_data *jd = ic->proto_data;
267
268	if( source == NULL )
269	{
270	/* The SSL connection will be cleaned up by the SSL lib
271	already, set it to NULL here to prevent a double cleanup: */
272	jd->ssl = NULL;
273
274	imcb_error( ic, "Could not connect to server" );
275	imc_logout( ic, TRUE );
276	return FALSE;
277	}
278
279	imcb_log( ic, "Connected to server, logging in" );
280
281	return jabber_start_stream( ic );
282	}
283
284	static xt_status jabber_end_of_stream( struct xt_node *node, gpointer data )
285	{
286	imc_logout( data, TRUE );
287	return XT_ABORT;
288	}
289
290	static xt_status jabber_pkt_features( struct xt_node *node, gpointer data )
291	{
292	struct im_connection *ic = data;
293	struct jabber_data *jd = ic->proto_data;
294	struct xt_node c, reply;
295	int trytls;
296
297	trytls = g_strcasecmp( set_getstr( &ic->acc->set, "tls" ), "try" ) == 0;
298	c = xt_find_node( node->children, "starttls" );
299	if( c && !jd->ssl )
300	{
301	/* If the server advertises the STARTTLS feature and if we're
302	not in a secure connection already: */
303
304	c = xt_find_node( c->children, "required" );
305
306	if( c && ( !trytls && !set_getbool( &ic->acc->set, "tls" ) ) )
307	{
308	imcb_error( ic, "Server requires TLS connections, but TLS is turned off for this account" );
309	imc_logout( ic, FALSE );
310
311	return XT_ABORT;
312	}
313
314	/* Only run this if the tls setting is set to true or try: */
315	if( ( trytls \|\| set_getbool( &ic->acc->set, "tls" ) ) )
316	{
317	reply = xt_new_node( "starttls", NULL, NULL );
318	xt_add_attr( reply, "xmlns", XMLNS_TLS );
319	if( !jabber_write_packet( ic, reply ) )
320	{
321	xt_free_node( reply );
322	return XT_ABORT;
323	}
324	xt_free_node( reply );
325
326	return XT_HANDLED;
327	}
328	}
329	else if( !c && !jd->ssl )
330	{
331	/* If the server does not advertise the STARTTLS feature and
332	we're not in a secure connection already: (Servers have a
333	habit of not advertising <starttls/> anymore when already
334	using SSL/TLS. */
335
336	if( !trytls && set_getbool( &ic->acc->set, "tls" ) )
337	{
338	imcb_error( ic, "TLS is turned on for this account, but is not supported by this server" );
339	imc_logout( ic, FALSE );
340
341	return XT_ABORT;
342	}
343	}
344
345	/* This one used to be in jabber_handlers[], but it has to be done
346	from here to make sure the TLS session will be initialized
347	properly before we attempt SASL authentication. */
348	if( ( c = xt_find_node( node->children, "mechanisms" ) ) )
349	{
350	if( sasl_pkt_mechanisms( c, data ) == XT_ABORT )
351	return XT_ABORT;
352	}
353	/* If the server SEEMS to support SASL authentication but doesn't
354	support it after all, we should try to do authentication the
355	other way. jabber.com doesn't seem to do SASL while it pretends
356	to be XMPP 1.0 compliant! */
357	else if( !( jd->flags & JFLAG_AUTHENTICATED ) && sasl_supported( ic ) )
358	{
359	if( !jabber_init_iq_auth( ic ) )
360	return XT_ABORT;
361	}
362
363	if( ( c = xt_find_node( node->children, "bind" ) ) )
364	{
365	reply = xt_new_node( "bind", NULL, xt_new_node( "resource", set_getstr( &ic->acc->set, "resource" ), NULL ) );
366	xt_add_attr( reply, "xmlns", XMLNS_BIND );
367	reply = jabber_make_packet( "iq", "set", NULL, reply );
368	jabber_cache_add( ic, reply, jabber_pkt_bind_sess );
369
370	if( !jabber_write_packet( ic, reply ) )
371	return XT_ABORT;
372
373	jd->flags \|= JFLAG_WAIT_BIND;
374	}
375
376	if( ( c = xt_find_node( node->children, "session" ) ) )
377	{
378	reply = xt_new_node( "session", NULL, NULL );
379	xt_add_attr( reply, "xmlns", XMLNS_SESSION );
380	reply = jabber_make_packet( "iq", "set", NULL, reply );
381	jabber_cache_add( ic, reply, jabber_pkt_bind_sess );
382
383	if( !jabber_write_packet( ic, reply ) )
384	return XT_ABORT;
385
386	jd->flags \|= JFLAG_WAIT_SESSION;
387	}
388
389	/* This flag is already set if we authenticated via SASL, so now
390	we can resume the session in the new stream, if we don't have
391	to bind/initialize the session. */
392	if( jd->flags & JFLAG_AUTHENTICATED && ( jd->flags & ( JFLAG_WAIT_BIND \| JFLAG_WAIT_SESSION ) ) == 0 )
393	{
394	if( !jabber_get_roster( ic ) )
395	return XT_ABORT;
396	}
397
398	return XT_HANDLED;
399	}
400
401	static xt_status jabber_pkt_proceed_tls( struct xt_node *node, gpointer data )
402	{
403	struct im_connection *ic = data;
404	struct jabber_data *jd = ic->proto_data;
405	char *xmlns;
406
407	xmlns = xt_find_attr( node, "xmlns" );
408
409	/* Just ignore it when it doesn't seem to be TLS-related (is that at
410	all possible??). */
411	if( !xmlns \|\| strcmp( xmlns, XMLNS_TLS ) != 0 )
412	return XT_HANDLED;
413
414	/* We don't want event handlers to touch our TLS session while it's
415	still initializing! */
416	b_event_remove( jd->r_inpa );
417	if( jd->tx_len > 0 )
418	{
419	/* Actually the write queue should be empty here, but just
420	to be sure... */
421	b_event_remove( jd->w_inpa );
422	g_free( jd->txq );
423	jd->txq = NULL;
424	jd->tx_len = 0;
425	}
426	jd->w_inpa = jd->r_inpa = 0;
427
428	imcb_log( ic, "Converting stream to TLS" );
429
430	jd->ssl = ssl_starttls( jd->fd, jabber_connected_ssl, ic );
431
432	return XT_HANDLED;
433	}
434
435	static xt_status jabber_pkt_stream_error( struct xt_node *node, gpointer data )
436	{
437	struct im_connection *ic = data;
438	int allow_reconnect = TRUE;
439	struct jabber_error *err;
440
441	err = jabber_error_parse( node, XMLNS_STREAM_ERROR );
442
443	/* Tssk... */
444	if( err->code == NULL )
445	{
446	imcb_error( ic, "Unknown stream error reported by server" );
447	imc_logout( ic, allow_reconnect );
448	jabber_error_free( err );
449	return XT_ABORT;
450	}
451
452	/* We know that this is a fatal error. If it's a "conflict" error, we
453	should turn off auto-reconnect to make sure we won't get some nasty
454	infinite loop! */
455	if( strcmp( err->code, "conflict" ) == 0 )
456	{
457	imcb_error( ic, "Account and resource used from a different location" );
458	allow_reconnect = FALSE;
459	}
460	else
461	{
462	imcb_error( ic, "Stream error: %s%s%s", err->code, err->text ? ": " : "",
463	err->text ? err->text : "" );
464	}
465
466	jabber_error_free( err );
467	imc_logout( ic, allow_reconnect );
468
469	return XT_ABORT;
470	}
471
472	static xt_status jabber_xmlconsole( struct xt_node *node, gpointer data )
473	{
474	struct im_connection *ic = data;
475	struct jabber_data *jd = ic->proto_data;
476
477	if( jd->flags & JFLAG_XMLCONSOLE )
478	{
479	char msg, pkt;
480
481	pkt = xt_to_string( node );
482	msg = g_strdup_printf( "RX: %s", pkt );
483	imcb_buddy_msg( ic, JABBER_XMLCONSOLE_HANDLE, msg, 0, 0 );
484	g_free( msg );
485	g_free( pkt );
486	}
487
488	return XT_NEXT;
489	}
490
491	static const struct xt_handler_entry jabber_handlers[] = {
492	{ NULL, "stream:stream", jabber_xmlconsole },
493	{ "stream:stream", "<root>", jabber_end_of_stream },
494	{ "message", "stream:stream", jabber_pkt_message },
495	{ "presence", "stream:stream", jabber_pkt_presence },
496	{ "iq", "stream:stream", jabber_pkt_iq },
497	{ "stream:features", "stream:stream", jabber_pkt_features },
498	{ "stream:error", "stream:stream", jabber_pkt_stream_error },
499	{ "proceed", "stream:stream", jabber_pkt_proceed_tls },
500	{ "challenge", "stream:stream", sasl_pkt_challenge },
501	{ "success", "stream:stream", sasl_pkt_result },
502	{ "failure", "stream:stream", sasl_pkt_result },
503	{ NULL, NULL, NULL }
504	};
505
506	gboolean jabber_start_stream( struct im_connection *ic )
507	{
508	struct jabber_data *jd = ic->proto_data;
509	int st;
510	char *greet;
511
512	/* We'll start our stream now, so prepare everything to receive one
513	from the server too. */
514	xt_free( jd->xt ); /* In case we're RE-starting. */
515	jd->xt = xt_new( ic );
516	jd->xt->handlers = (struct xt_handler_entry*) jabber_handlers;
517
518	if( jd->r_inpa <= 0 )
519	jd->r_inpa = b_input_add( jd->fd, GAIM_INPUT_READ, jabber_read_callback, ic );
520
521	greet = g_strdup_printf( "<?xml version='1.0' ?>"
522	"<stream:stream to=\"%s\" xmlns=\"jabber:client\" "
523	"xmlns:stream=\"http://etherx.jabber.org/streams\" version=\"1.0\">", jd->server );
524
525	st = jabber_write( ic, greet, strlen( greet ) );
526
527	g_free( greet );
528
529	return st;
530	}
531
532	void jabber_end_stream( struct im_connection *ic )
533	{
534	struct jabber_data *jd = ic->proto_data;
535
536	/* Let's only do this if the queue is currently empty, otherwise it'd
537	take too long anyway. */
538	if( jd->tx_len == 0 )
539	{
540	char eos[] = "</stream:stream>";
541	struct xt_node *node;
542	int st = 1;
543
544	if( ic->flags & OPT_LOGGED_IN )
545	{
546	node = jabber_make_packet( "presence", "unavailable", NULL, NULL );
547	st = jabber_write_packet( ic, node );
548	xt_free_node( node );
549	}
550
551	if( st )
552	jabber_write( ic, eos, strlen( eos ) );
553	}
554	}

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