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source: protocols/jabber/si.c @ 6a6d7d8

Last change on this file since 6a6d7d8 was 92d3044, checked in by Wilmer van der Gaast <wilmer@…>, at 2012-12-18T01:24:33Z
Improved failure handling in jabber_si_handle_request(). If the imcb callback fails, we shouldn't try to continue the ft and dereference the NULL ptr it returned.
Property mode set to `100644`
File size: 17.0 KB

Line
1	/***************************************************************************\
2	* *
3	* BitlBee - An IRC to IM gateway *
4	* Jabber module - SI packets *
5	* *
6	* Copyright 2007 Uli Meis <a.sporto+bee@gmail.com> *
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 "sha1.h"
26
27	void jabber_si_answer_request( file_transfer_t *ft );
28	int jabber_si_send_request(struct im_connection ic, char who, struct jabber_transfer *tf );
29
30	/* file_transfer free() callback */
31	void jabber_si_free_transfer( file_transfer_t *ft)
32	{
33	struct jabber_transfer *tf = ft->data;
34	struct jabber_data *jd = tf->ic->proto_data;
35
36	if ( tf->watch_in )
37	b_event_remove( tf->watch_in );
38
39	jd->filetransfers = g_slist_remove( jd->filetransfers, tf );
40
41	if( tf->fd != -1 )
42	{
43	closesocket( tf->fd );
44	tf->fd = -1;
45	}
46
47	if( tf->disco_timeout )
48	b_event_remove( tf->disco_timeout );
49
50	g_free( tf->ini_jid );
51	g_free( tf->tgt_jid );
52	g_free( tf->iq_id );
53	g_free( tf->sid );
54	g_free( tf );
55	}
56
57	/* file_transfer canceled() callback */
58	void jabber_si_canceled( file_transfer_t ft, char reason )
59	{
60	struct jabber_transfer *tf = ft->data;
61	struct xt_node reply, iqnode;
62
63	if( tf->accepted )
64	return;
65
66	iqnode = jabber_make_packet( "iq", "error", tf->ini_jid, NULL );
67	xt_add_attr( iqnode, "id", tf->iq_id );
68	reply = jabber_make_error_packet( iqnode, "forbidden", "cancel", "403" );
69	xt_free_node( iqnode );
70
71	if( !jabber_write_packet( tf->ic, reply ) )
72	imcb_log( tf->ic, "WARNING: Error generating reply to file transfer request" );
73	xt_free_node( reply );
74
75	}
76
77	int jabber_si_check_features( struct jabber_transfer tf, GSList features ) {
78	int foundft = FALSE, foundbt = FALSE, foundsi = FALSE;
79
80	while ( features )
81	{
82	if( !strcmp( features->data, XMLNS_FILETRANSFER ) )
83	foundft = TRUE;
84	if( !strcmp( features->data, XMLNS_BYTESTREAMS ) )
85	foundbt = TRUE;
86	if( !strcmp( features->data, XMLNS_SI ) )
87	foundsi = TRUE;
88
89	features = g_slist_next(features);
90	}
91
92	if( !foundft )
93	imcb_file_canceled( tf->ic, tf->ft, "Buddy's client doesn't feature file transfers" );
94	else if( !foundbt )
95	imcb_file_canceled( tf->ic, tf->ft, "Buddy's client doesn't feature byte streams (required)" );
96	else if( !foundsi )
97	imcb_file_canceled( tf->ic, tf->ft, "Buddy's client doesn't feature stream initiation (required)" );
98
99	return foundft && foundbt && foundsi;
100	}
101
102	void jabber_si_transfer_start( struct jabber_transfer *tf ) {
103
104	if( !jabber_si_check_features( tf, tf->bud->features ) )
105	return;
106
107	/* send the request to our buddy */
108	jabber_si_send_request( tf->ic, tf->bud->full_jid, tf );
109
110	/* and start the receive logic */
111	imcb_file_recv_start( tf->ic, tf->ft );
112
113	}
114
115	gboolean jabber_si_waitfor_disco( gpointer data, gint fd, b_input_condition cond )
116	{
117	struct jabber_transfer *tf = data;
118	struct jabber_data *jd = tf->ic->proto_data;
119
120	tf->disco_timeout_fired++;
121
122	if( tf->bud->features && jd->have_streamhosts==1 ) {
123	tf->disco_timeout = 0;
124	jabber_si_transfer_start( tf );
125	return FALSE;
126	}
127
128	/* 8 seconds should be enough for server and buddy to respond */
129	if ( tf->disco_timeout_fired < 16 )
130	return TRUE;
131
132	if( !tf->bud->features && jd->have_streamhosts!=1 )
133	imcb_log( tf->ic, "Couldn't get buddy's features nor discover all services of the server" );
134	else if( !tf->bud->features )
135	imcb_log( tf->ic, "Couldn't get buddy's features" );
136	else
137	imcb_log( tf->ic, "Couldn't discover some of the server's services" );
138
139	tf->disco_timeout = 0;
140	jabber_si_transfer_start( tf );
141	return FALSE;
142	}
143
144	void jabber_si_transfer_request( struct im_connection ic, file_transfer_t ft, char *who )
145	{
146	struct jabber_transfer *tf;
147	struct jabber_data *jd = ic->proto_data;
148	struct jabber_buddy *bud;
149	char server = jd->server, s;
150
151	if( ( s = strchr( who, '=' ) ) && jabber_chat_by_jid( ic, s + 1 ) )
152	bud = jabber_buddy_by_ext_jid( ic, who, 0 );
153	else
154	bud = jabber_buddy_by_jid( ic, who, 0 );
155
156	if( bud == NULL )
157	{
158	imcb_file_canceled( ic, ft, "Couldn't find buddy (BUG?)" );
159	return;
160	}
161
162	imcb_log( ic, "Trying to send %s(%zd bytes) to %s", ft->file_name, ft->file_size, who );
163
164	tf = g_new0( struct jabber_transfer, 1 );
165
166	tf->ic = ic;
167	tf->ft = ft;
168	tf->fd = -1;
169	tf->ft->data = tf;
170	tf->ft->free = jabber_si_free_transfer;
171	tf->bud = bud;
172	ft->write = jabber_bs_send_write;
173
174	jd->filetransfers = g_slist_prepend( jd->filetransfers, tf );
175
176	/* query buddy's features and server's streaming proxies if neccessary */
177
178	if( !tf->bud->features )
179	jabber_iq_query_features( ic, bud->full_jid );
180
181	/* If <auto> is not set don't check for proxies */
182	if( ( jd->have_streamhosts!=1 ) && ( jd->streamhosts==NULL ) &&
183	( strstr( set_getstr( &ic->acc->set, "proxy" ), "<auto>" ) != NULL ) ) {
184	jd->have_streamhosts = 0;
185	jabber_iq_query_server( ic, server, XMLNS_DISCO_ITEMS );
186	} else if ( jd->streamhosts!=NULL )
187	jd->have_streamhosts = 1;
188
189	/* if we had to do a query, wait for the result.
190	* Otherwise fire away. */
191	if( !tf->bud->features \|\| jd->have_streamhosts!=1 )
192	tf->disco_timeout = b_timeout_add( 500, jabber_si_waitfor_disco, tf );
193	else
194	jabber_si_transfer_start( tf );
195	}
196
197	/*
198	* First function that gets called when a file transfer request comes in.
199	* A lot to parse.
200	*
201	* We choose a stream type from the options given by the initiator.
202	* Then we wait for imcb to call the accept or cancel callbacks.
203	*/
204	int jabber_si_handle_request( struct im_connection ic, struct xt_node node, struct xt_node *sinode)
205	{
206	struct xt_node c, d, *reply;
207	char sid, ini_jid, tgt_jid, iq_id, s, ext_jid, *size_s;
208	struct jabber_buddy *bud;
209	int requestok = FALSE;
210	char name, cmp;
211	size_t size;
212	struct jabber_transfer *tf;
213	struct jabber_data *jd = ic->proto_data;
214	file_transfer_t *ft;
215
216	/* All this means we expect something like this: ( I think )
217	* <iq from=... to=... id=...>
218	* <si id=id xmlns=si profile=ft>
219	* <file xmlns=ft/>
220	* <feature xmlns=feature>
221	* <x xmlns=xdata type=submit>
222	* <field var=stream-method>
223	*
224	*/
225	if( !( ini_jid = xt_find_attr( node, "from" ) ) \|\|
226	!( tgt_jid = xt_find_attr( node, "to" ) ) \|\|
227	!( iq_id = xt_find_attr( node, "id" ) ) \|\|
228	!( sid = xt_find_attr( sinode, "id" ) ) \|\|
229	!( cmp = xt_find_attr( sinode, "profile" ) ) \|\|
230	!( 0 == strcmp( cmp, XMLNS_FILETRANSFER ) ) \|\|
231	!( d = xt_find_node( sinode->children, "file" ) ) \|\|
232	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
233	!( 0 == strcmp( cmp, XMLNS_FILETRANSFER ) ) \|\|
234	!( name = xt_find_attr( d, "name" ) ) \|\|
235	!( size_s = xt_find_attr( d, "size" ) ) \|\|
236	!( 1 == sscanf( size_s, "%zd", &size ) ) \|\|
237	!( d = xt_find_node( sinode->children, "feature" ) ) \|\|
238	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
239	!( 0 == strcmp( cmp, XMLNS_FEATURE ) ) \|\|
240	!( d = xt_find_node( d->children, "x" ) ) \|\|
241	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
242	!( 0 == strcmp( cmp, XMLNS_XDATA ) ) \|\|
243	!( cmp = xt_find_attr( d, "type" ) ) \|\|
244	!( 0 == strcmp( cmp, "form" ) ) \|\|
245	!( d = xt_find_node( d->children, "field" ) ) \|\|
246	!( cmp = xt_find_attr( d, "var" ) ) \|\|
247	!( 0 == strcmp( cmp, "stream-method" ) ) )
248	{
249	imcb_log( ic, "WARNING: Received incomplete Stream Initiation request" );
250	}
251	else
252	{
253	/* Check if we support one of the options */
254
255	c = d->children;
256	while( ( c = xt_find_node( c, "option" ) ) )
257	if( ( d = xt_find_node( c->children, "value" ) ) &&
258	( d->text != NULL ) &&
259	( strcmp( d->text, XMLNS_BYTESTREAMS ) == 0 ) )
260	{
261	requestok = TRUE;
262	break;
263	}
264	else
265	{
266	c = c->next;
267	}
268
269	if ( !requestok )
270	imcb_log( ic, "WARNING: Unsupported file transfer request from %s", ini_jid);
271	}
272
273	if( requestok )
274	{
275	/* Figure out who the transfer should come frome... */
276
277	ext_jid = ini_jid;
278	if( ( s = strchr( ini_jid, '/' ) ) )
279	{
280	if( ( bud = jabber_buddy_by_jid( ic, ini_jid, GET_BUDDY_EXACT ) ) )
281	{
282	bud->last_msg = time( NULL );
283	ext_jid = bud->ext_jid ? : bud->bare_jid;
284	}
285	else
286	s = 0; / We need to generate a bare JID now. */
287	}
288
289	if( !( ft = imcb_file_send_start( ic, ext_jid, name, size ) ) )
290	{
291	imcb_log( ic, "WARNING: Error handling transfer request from %s", ini_jid);
292	requestok = FALSE;
293	}
294
295	if( s )
296	*s = '/';
297	}
298
299	if( !requestok )
300	{
301	reply = jabber_make_error_packet( node, "item-not-found", "cancel", NULL );
302	if (!jabber_write_packet( ic, reply ))
303	imcb_log( ic, "WARNING: Error generating reply to file transfer request" );
304	xt_free_node( reply );
305	return XT_HANDLED;
306	}
307
308	/* Request is fine. */
309
310	tf = g_new0( struct jabber_transfer, 1 );
311
312	tf->ini_jid = g_strdup( ini_jid );
313	tf->tgt_jid = g_strdup( tgt_jid );
314	tf->iq_id = g_strdup( iq_id );
315	tf->sid = g_strdup( sid );
316	tf->ic = ic;
317	tf->ft = ft;
318	tf->fd = -1;
319	tf->ft->data = tf;
320	tf->ft->accept = jabber_si_answer_request;
321	tf->ft->free = jabber_si_free_transfer;
322	tf->ft->canceled = jabber_si_canceled;
323
324	jd->filetransfers = g_slist_prepend( jd->filetransfers, tf );
325
326	return XT_HANDLED;
327	}
328
329	/*
330	* imc called the accept callback which probably means that the user accepted this file transfer.
331	* We send our response to the initiator.
332	* In the next step, the initiator will send us a request for the given stream type.
333	* (currently that can only be a SOCKS5 bytestream)
334	*/
335	void jabber_si_answer_request( file_transfer_t *ft ) {
336	struct jabber_transfer *tf = ft->data;
337	struct xt_node node, sinode, *reply;
338
339	/* generate response, start with the SI tag */
340	sinode = xt_new_node( "si", NULL, NULL );
341	xt_add_attr( sinode, "xmlns", XMLNS_SI );
342	xt_add_attr( sinode, "profile", XMLNS_FILETRANSFER );
343	xt_add_attr( sinode, "id", tf->sid );
344
345	/* now the file tag */
346	node = xt_new_node( "file", NULL, NULL );
347	xt_add_attr( node, "xmlns", XMLNS_FILETRANSFER );
348
349	xt_add_child( sinode, node );
350
351	/* and finally the feature tag */
352	node = xt_new_node( "field", NULL, NULL );
353	xt_add_attr( node, "var", "stream-method" );
354	xt_add_attr( node, "type", "list-single" );
355
356	/* Currently all we can do. One could also implement in-band (IBB) */
357	xt_add_child( node, xt_new_node( "value", XMLNS_BYTESTREAMS, NULL ) );
358
359	node = xt_new_node( "x", NULL, node );
360	xt_add_attr( node, "xmlns", XMLNS_XDATA );
361	xt_add_attr( node, "type", "submit" );
362
363	node = xt_new_node( "feature", NULL, node );
364	xt_add_attr( node, "xmlns", XMLNS_FEATURE );
365
366	xt_add_child( sinode, node );
367
368	reply = jabber_make_packet( "iq", "result", tf->ini_jid, sinode );
369	xt_add_attr( reply, "id", tf->iq_id );
370
371	if( !jabber_write_packet( tf->ic, reply ) )
372	imcb_log( tf->ic, "WARNING: Error generating reply to file transfer request" );
373	else
374	tf->accepted = TRUE;
375	xt_free_node( reply );
376	}
377
378	static xt_status jabber_si_handle_response(struct im_connection ic, struct xt_node node, struct xt_node *orig )
379	{
380	struct xt_node c, d;
381	char ini_jid = NULL, tgt_jid, iq_id, cmp;
382	GSList *tflist;
383	struct jabber_transfer *tf=NULL;
384	struct jabber_data *jd = ic->proto_data;
385
386	if( !( tgt_jid = xt_find_attr( node, "from" ) ) \|\|
387	!( ini_jid = xt_find_attr( node, "to" ) ) )
388	{
389	imcb_log( ic, "Invalid SI response from=%s to=%s", tgt_jid, ini_jid );
390	return XT_HANDLED;
391	}
392
393	/* All this means we expect something like this: ( I think )
394	* <iq from=... to=... id=...>
395	* <si xmlns=si>
396	* [ <file xmlns=ft/> ] <-- not neccessary
397	* <feature xmlns=feature>
398	* <x xmlns=xdata type=submit>
399	* <field var=stream-method>
400	* <value>
401	*/
402	if( !( tgt_jid = xt_find_attr( node, "from" ) ) \|\|
403	!( ini_jid = xt_find_attr( node, "to" ) ) \|\|
404	!( iq_id = xt_find_attr( node, "id" ) ) \|\|
405	!( c = xt_find_node( node->children, "si" ) ) \|\|
406	!( cmp = xt_find_attr( c, "xmlns" ) ) \|\|
407	!( strcmp( cmp, XMLNS_SI ) == 0 ) \|\|
408	!( d = xt_find_node( c->children, "feature" ) ) \|\|
409	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
410	!( strcmp( cmp, XMLNS_FEATURE ) == 0 ) \|\|
411	!( d = xt_find_node( d->children, "x" ) ) \|\|
412	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
413	!( strcmp( cmp, XMLNS_XDATA ) == 0 ) \|\|
414	!( cmp = xt_find_attr( d, "type" ) ) \|\|
415	!( strcmp( cmp, "submit" ) == 0 ) \|\|
416	!( d = xt_find_node( d->children, "field" ) ) \|\|
417	!( cmp = xt_find_attr( d, "var" ) ) \|\|
418	!( strcmp( cmp, "stream-method" ) == 0 ) \|\|
419	!( d = xt_find_node( d->children, "value" ) ) )
420	{
421	imcb_log( ic, "WARNING: Received incomplete Stream Initiation response" );
422	return XT_HANDLED;
423	}
424
425	if( !( strcmp( d->text, XMLNS_BYTESTREAMS ) == 0 ) ) {
426	/* since we should only have advertised what we can do and the peer should
427	* only have chosen what we offered, this should never happen */
428	imcb_log( ic, "WARNING: Received invalid Stream Initiation response, method %s", d->text );
429
430	return XT_HANDLED;
431	}
432
433	/* Let's see if we can find out what this bytestream should be for... */
434
435	for( tflist = jd->filetransfers ; tflist; tflist = g_slist_next(tflist) )
436	{
437	struct jabber_transfer *tft = tflist->data;
438	if( ( strcmp( tft->iq_id, iq_id ) == 0 ) )
439	{
440	tf = tft;
441	break;
442	}
443	}
444
445	if (!tf)
446	{
447	imcb_log( ic, "WARNING: Received bytestream request from %s that doesn't match an SI request", ini_jid );
448	return XT_HANDLED;
449	}
450
451	tf->ini_jid = g_strdup( ini_jid );
452	tf->tgt_jid = g_strdup( tgt_jid );
453
454	imcb_log( ic, "File %s: %s accepted the transfer!", tf->ft->file_name, tgt_jid );
455
456	jabber_bs_send_start( tf );
457
458	return XT_HANDLED;
459	}
460
461	int jabber_si_send_request(struct im_connection ic, char who, struct jabber_transfer *tf )
462	{
463	struct xt_node node, sinode;
464	struct jabber_buddy *bud;
465
466	/* who knows how many bits the future holds :) */
467	char filesizestr[ 1 + ( int ) ( 0.301029995663981198f * sizeof( size_t ) * 8 ) ];
468
469	const char *methods[] =
470	{
471	XMLNS_BYTESTREAMS,
472	//XMLNS_IBB,
473	NULL
474	};
475	const char **m;
476	char *s;
477
478	/* Maybe we should hash this? */
479	tf->sid = g_strdup_printf( "BitlBeeJabberSID%d", tf->ft->local_id );
480
481	if( ( s = strchr( who, '=' ) ) && jabber_chat_by_jid( ic, s + 1 ) )
482	bud = jabber_buddy_by_ext_jid( ic, who, 0 );
483	else
484	bud = jabber_buddy_by_jid( ic, who, 0 );
485
486	/* start with the SI tag */
487	sinode = xt_new_node( "si", NULL, NULL );
488	xt_add_attr( sinode, "xmlns", XMLNS_SI );
489	xt_add_attr( sinode, "profile", XMLNS_FILETRANSFER );
490	xt_add_attr( sinode, "id", tf->sid );
491
492	/* if( mimetype )
493	xt_add_attr( node, "mime-type", mimetype ); */
494
495	/* now the file tag */
496	/* if( desc )
497	node = xt_new_node( "desc", descr, NULL ); */
498	node = xt_new_node( "range", NULL, NULL );
499
500	sprintf( filesizestr, "%zd", tf->ft->file_size );
501	node = xt_new_node( "file", NULL, node );
502	xt_add_attr( node, "xmlns", XMLNS_FILETRANSFER );
503	xt_add_attr( node, "name", tf->ft->file_name );
504	xt_add_attr( node, "size", filesizestr );
505	/* if (hash)
506	xt_add_attr( node, "hash", hash );
507	if (date)
508	xt_add_attr( node, "date", date ); */
509
510	xt_add_child( sinode, node );
511
512	/* and finally the feature tag */
513	node = xt_new_node( "field", NULL, NULL );
514	xt_add_attr( node, "var", "stream-method" );
515	xt_add_attr( node, "type", "list-single" );
516
517	for ( m = methods ; *m ; m ++ )
518	xt_add_child( node, xt_new_node( "option", NULL, xt_new_node( "value", (char )m, NULL ) ) );
519
520	node = xt_new_node( "x", NULL, node );
521	xt_add_attr( node, "xmlns", XMLNS_XDATA );
522	xt_add_attr( node, "type", "form" );
523
524	node = xt_new_node( "feature", NULL, node );
525	xt_add_attr( node, "xmlns", XMLNS_FEATURE );
526
527	xt_add_child( sinode, node );
528
529	/* and we are there... */
530	node = jabber_make_packet( "iq", "set", bud ? bud->full_jid : who, sinode );
531	jabber_cache_add( ic, node, jabber_si_handle_response );
532	tf->iq_id = g_strdup( xt_find_attr( node, "id" ) );
533
534	return jabber_write_packet( ic, node );
535	}

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