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source: protocols/jabber/si.c @ d2b3f25

Last change on this file since d2b3f25 was 8256ad5, checked in by dequis <dx@…>, at 2014-10-27T06:36:05Z

Some more g_source_remove warning fixes

http_incoming_data calling itself
jabber_bs_free_transfer calling jabber_si_free_transfer

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	{
38	b_event_remove( tf->watch_in );
39	tf->watch_in = 0;
40	}
41
42	jd->filetransfers = g_slist_remove( jd->filetransfers, tf );
43
44	if( tf->fd != -1 )
45	{
46	closesocket( tf->fd );
47	tf->fd = -1;
48	}
49
50	if( tf->disco_timeout )
51	b_event_remove( tf->disco_timeout );
52
53	g_free( tf->ini_jid );
54	g_free( tf->tgt_jid );
55	g_free( tf->iq_id );
56	g_free( tf->sid );
57	g_free( tf );
58	}
59
60	/* file_transfer canceled() callback */
61	void jabber_si_canceled( file_transfer_t ft, char reason )
62	{
63	struct jabber_transfer *tf = ft->data;
64	struct xt_node reply, iqnode;
65
66	if( tf->accepted )
67	return;
68
69	iqnode = jabber_make_packet( "iq", "error", tf->ini_jid, NULL );
70	xt_add_attr( iqnode, "id", tf->iq_id );
71	reply = jabber_make_error_packet( iqnode, "forbidden", "cancel", "403" );
72	xt_free_node( iqnode );
73
74	if( !jabber_write_packet( tf->ic, reply ) )
75	imcb_log( tf->ic, "WARNING: Error generating reply to file transfer request" );
76	xt_free_node( reply );
77
78	}
79
80	int jabber_si_check_features( struct jabber_transfer tf, GSList features ) {
81	int foundft = FALSE, foundbt = FALSE, foundsi = FALSE;
82
83	while ( features )
84	{
85	if( !strcmp( features->data, XMLNS_FILETRANSFER ) )
86	foundft = TRUE;
87	if( !strcmp( features->data, XMLNS_BYTESTREAMS ) )
88	foundbt = TRUE;
89	if( !strcmp( features->data, XMLNS_SI ) )
90	foundsi = TRUE;
91
92	features = g_slist_next(features);
93	}
94
95	if( !foundft )
96	imcb_file_canceled( tf->ic, tf->ft, "Buddy's client doesn't feature file transfers" );
97	else if( !foundbt )
98	imcb_file_canceled( tf->ic, tf->ft, "Buddy's client doesn't feature byte streams (required)" );
99	else if( !foundsi )
100	imcb_file_canceled( tf->ic, tf->ft, "Buddy's client doesn't feature stream initiation (required)" );
101
102	return foundft && foundbt && foundsi;
103	}
104
105	void jabber_si_transfer_start( struct jabber_transfer *tf ) {
106
107	if( !jabber_si_check_features( tf, tf->bud->features ) )
108	return;
109
110	/* send the request to our buddy */
111	jabber_si_send_request( tf->ic, tf->bud->full_jid, tf );
112
113	/* and start the receive logic */
114	imcb_file_recv_start( tf->ic, tf->ft );
115
116	}
117
118	gboolean jabber_si_waitfor_disco( gpointer data, gint fd, b_input_condition cond )
119	{
120	struct jabber_transfer *tf = data;
121	struct jabber_data *jd = tf->ic->proto_data;
122
123	tf->disco_timeout_fired++;
124
125	if( tf->bud->features && jd->have_streamhosts==1 ) {
126	tf->disco_timeout = 0;
127	jabber_si_transfer_start( tf );
128	return FALSE;
129	}
130
131	/* 8 seconds should be enough for server and buddy to respond */
132	if ( tf->disco_timeout_fired < 16 )
133	return TRUE;
134
135	if( !tf->bud->features && jd->have_streamhosts!=1 )
136	imcb_log( tf->ic, "Couldn't get buddy's features nor discover all services of the server" );
137	else if( !tf->bud->features )
138	imcb_log( tf->ic, "Couldn't get buddy's features" );
139	else
140	imcb_log( tf->ic, "Couldn't discover some of the server's services" );
141
142	tf->disco_timeout = 0;
143	jabber_si_transfer_start( tf );
144	return FALSE;
145	}
146
147	void jabber_si_transfer_request( struct im_connection ic, file_transfer_t ft, char *who )
148	{
149	struct jabber_transfer *tf;
150	struct jabber_data *jd = ic->proto_data;
151	struct jabber_buddy *bud;
152	char server = jd->server, s;
153
154	if( ( s = strchr( who, '=' ) ) && jabber_chat_by_jid( ic, s + 1 ) )
155	bud = jabber_buddy_by_ext_jid( ic, who, 0 );
156	else
157	bud = jabber_buddy_by_jid( ic, who, 0 );
158
159	if( bud == NULL )
160	{
161	imcb_file_canceled( ic, ft, "Couldn't find buddy (BUG?)" );
162	return;
163	}
164
165	imcb_log( ic, "Trying to send %s(%zd bytes) to %s", ft->file_name, ft->file_size, who );
166
167	tf = g_new0( struct jabber_transfer, 1 );
168
169	tf->ic = ic;
170	tf->ft = ft;
171	tf->fd = -1;
172	tf->ft->data = tf;
173	tf->ft->free = jabber_si_free_transfer;
174	tf->bud = bud;
175	ft->write = jabber_bs_send_write;
176
177	jd->filetransfers = g_slist_prepend( jd->filetransfers, tf );
178
179	/* query buddy's features and server's streaming proxies if neccessary */
180
181	if( !tf->bud->features )
182	jabber_iq_query_features( ic, bud->full_jid );
183
184	/* If <auto> is not set don't check for proxies */
185	if( ( jd->have_streamhosts!=1 ) && ( jd->streamhosts==NULL ) &&
186	( strstr( set_getstr( &ic->acc->set, "proxy" ), "<auto>" ) != NULL ) ) {
187	jd->have_streamhosts = 0;
188	jabber_iq_query_server( ic, server, XMLNS_DISCO_ITEMS );
189	} else if ( jd->streamhosts!=NULL )
190	jd->have_streamhosts = 1;
191
192	/* if we had to do a query, wait for the result.
193	* Otherwise fire away. */
194	if( !tf->bud->features \|\| jd->have_streamhosts!=1 )
195	tf->disco_timeout = b_timeout_add( 500, jabber_si_waitfor_disco, tf );
196	else
197	jabber_si_transfer_start( tf );
198	}
199
200	/*
201	* First function that gets called when a file transfer request comes in.
202	* A lot to parse.
203	*
204	* We choose a stream type from the options given by the initiator.
205	* Then we wait for imcb to call the accept or cancel callbacks.
206	*/
207	int jabber_si_handle_request( struct im_connection ic, struct xt_node node, struct xt_node *sinode)
208	{
209	struct xt_node c, d, *reply;
210	char sid, ini_jid, tgt_jid, iq_id, s, ext_jid, *size_s;
211	struct jabber_buddy *bud;
212	int requestok = FALSE;
213	char name, cmp;
214	size_t size;
215	struct jabber_transfer *tf;
216	struct jabber_data *jd = ic->proto_data;
217	file_transfer_t *ft;
218
219	/* All this means we expect something like this: ( I think )
220	* <iq from=... to=... id=...>
221	* <si id=id xmlns=si profile=ft>
222	* <file xmlns=ft/>
223	* <feature xmlns=feature>
224	* <x xmlns=xdata type=submit>
225	* <field var=stream-method>
226	*
227	*/
228	if( !( ini_jid = xt_find_attr( node, "from" ) ) \|\|
229	!( tgt_jid = xt_find_attr( node, "to" ) ) \|\|
230	!( iq_id = xt_find_attr( node, "id" ) ) \|\|
231	!( sid = xt_find_attr( sinode, "id" ) ) \|\|
232	!( cmp = xt_find_attr( sinode, "profile" ) ) \|\|
233	!( 0 == strcmp( cmp, XMLNS_FILETRANSFER ) ) \|\|
234	!( d = xt_find_node( sinode->children, "file" ) ) \|\|
235	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
236	!( 0 == strcmp( cmp, XMLNS_FILETRANSFER ) ) \|\|
237	!( name = xt_find_attr( d, "name" ) ) \|\|
238	!( size_s = xt_find_attr( d, "size" ) ) \|\|
239	!( 1 == sscanf( size_s, "%zd", &size ) ) \|\|
240	!( d = xt_find_node( sinode->children, "feature" ) ) \|\|
241	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
242	!( 0 == strcmp( cmp, XMLNS_FEATURE ) ) \|\|
243	!( d = xt_find_node( d->children, "x" ) ) \|\|
244	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
245	!( 0 == strcmp( cmp, XMLNS_XDATA ) ) \|\|
246	!( cmp = xt_find_attr( d, "type" ) ) \|\|
247	!( 0 == strcmp( cmp, "form" ) ) \|\|
248	!( d = xt_find_node( d->children, "field" ) ) \|\|
249	!( cmp = xt_find_attr( d, "var" ) ) \|\|
250	!( 0 == strcmp( cmp, "stream-method" ) ) )
251	{
252	imcb_log( ic, "WARNING: Received incomplete Stream Initiation request" );
253	}
254	else
255	{
256	/* Check if we support one of the options */
257
258	c = d->children;
259	while( ( c = xt_find_node( c, "option" ) ) )
260	if( ( d = xt_find_node( c->children, "value" ) ) &&
261	( d->text != NULL ) &&
262	( strcmp( d->text, XMLNS_BYTESTREAMS ) == 0 ) )
263	{
264	requestok = TRUE;
265	break;
266	}
267	else
268	{
269	c = c->next;
270	}
271
272	if ( !requestok )
273	imcb_log( ic, "WARNING: Unsupported file transfer request from %s", ini_jid);
274	}
275
276	if( requestok )
277	{
278	/* Figure out who the transfer should come frome... */
279
280	ext_jid = ini_jid;
281	if( ( s = strchr( ini_jid, '/' ) ) )
282	{
283	if( ( bud = jabber_buddy_by_jid( ic, ini_jid, GET_BUDDY_EXACT ) ) )
284	{
285	bud->last_msg = time( NULL );
286	ext_jid = bud->ext_jid ? : bud->bare_jid;
287	}
288	else
289	s = 0; / We need to generate a bare JID now. */
290	}
291
292	if( !( ft = imcb_file_send_start( ic, ext_jid, name, size ) ) )
293	{
294	imcb_log( ic, "WARNING: Error handling transfer request from %s", ini_jid);
295	requestok = FALSE;
296	}
297
298	if( s )
299	*s = '/';
300	}
301
302	if( !requestok )
303	{
304	reply = jabber_make_error_packet( node, "item-not-found", "cancel", NULL );
305	if (!jabber_write_packet( ic, reply ))
306	imcb_log( ic, "WARNING: Error generating reply to file transfer request" );
307	xt_free_node( reply );
308	return XT_HANDLED;
309	}
310
311	/* Request is fine. */
312
313	tf = g_new0( struct jabber_transfer, 1 );
314
315	tf->ini_jid = g_strdup( ini_jid );
316	tf->tgt_jid = g_strdup( tgt_jid );
317	tf->iq_id = g_strdup( iq_id );
318	tf->sid = g_strdup( sid );
319	tf->ic = ic;
320	tf->ft = ft;
321	tf->fd = -1;
322	tf->ft->data = tf;
323	tf->ft->accept = jabber_si_answer_request;
324	tf->ft->free = jabber_si_free_transfer;
325	tf->ft->canceled = jabber_si_canceled;
326
327	jd->filetransfers = g_slist_prepend( jd->filetransfers, tf );
328
329	return XT_HANDLED;
330	}
331
332	/*
333	* imc called the accept callback which probably means that the user accepted this file transfer.
334	* We send our response to the initiator.
335	* In the next step, the initiator will send us a request for the given stream type.
336	* (currently that can only be a SOCKS5 bytestream)
337	*/
338	void jabber_si_answer_request( file_transfer_t *ft ) {
339	struct jabber_transfer *tf = ft->data;
340	struct xt_node node, sinode, *reply;
341
342	/* generate response, start with the SI tag */
343	sinode = xt_new_node( "si", NULL, NULL );
344	xt_add_attr( sinode, "xmlns", XMLNS_SI );
345	xt_add_attr( sinode, "profile", XMLNS_FILETRANSFER );
346	xt_add_attr( sinode, "id", tf->sid );
347
348	/* now the file tag */
349	node = xt_new_node( "file", NULL, NULL );
350	xt_add_attr( node, "xmlns", XMLNS_FILETRANSFER );
351
352	xt_add_child( sinode, node );
353
354	/* and finally the feature tag */
355	node = xt_new_node( "field", NULL, NULL );
356	xt_add_attr( node, "var", "stream-method" );
357	xt_add_attr( node, "type", "list-single" );
358
359	/* Currently all we can do. One could also implement in-band (IBB) */
360	xt_add_child( node, xt_new_node( "value", XMLNS_BYTESTREAMS, NULL ) );
361
362	node = xt_new_node( "x", NULL, node );
363	xt_add_attr( node, "xmlns", XMLNS_XDATA );
364	xt_add_attr( node, "type", "submit" );
365
366	node = xt_new_node( "feature", NULL, node );
367	xt_add_attr( node, "xmlns", XMLNS_FEATURE );
368
369	xt_add_child( sinode, node );
370
371	reply = jabber_make_packet( "iq", "result", tf->ini_jid, sinode );
372	xt_add_attr( reply, "id", tf->iq_id );
373
374	if( !jabber_write_packet( tf->ic, reply ) )
375	imcb_log( tf->ic, "WARNING: Error generating reply to file transfer request" );
376	else
377	tf->accepted = TRUE;
378	xt_free_node( reply );
379	}
380
381	static xt_status jabber_si_handle_response(struct im_connection ic, struct xt_node node, struct xt_node *orig )
382	{
383	struct xt_node c, d;
384	char ini_jid = NULL, tgt_jid, iq_id, cmp;
385	GSList *tflist;
386	struct jabber_transfer *tf=NULL;
387	struct jabber_data *jd = ic->proto_data;
388
389	if( !( tgt_jid = xt_find_attr( node, "from" ) ) \|\|
390	!( ini_jid = xt_find_attr( node, "to" ) ) )
391	{
392	imcb_log( ic, "Invalid SI response from=%s to=%s", tgt_jid, ini_jid );
393	return XT_HANDLED;
394	}
395
396	/* All this means we expect something like this: ( I think )
397	* <iq from=... to=... id=...>
398	* <si xmlns=si>
399	* [ <file xmlns=ft/> ] <-- not neccessary
400	* <feature xmlns=feature>
401	* <x xmlns=xdata type=submit>
402	* <field var=stream-method>
403	* <value>
404	*/
405	if( !( tgt_jid = xt_find_attr( node, "from" ) ) \|\|
406	!( ini_jid = xt_find_attr( node, "to" ) ) \|\|
407	!( iq_id = xt_find_attr( node, "id" ) ) \|\|
408	!( c = xt_find_node( node->children, "si" ) ) \|\|
409	!( cmp = xt_find_attr( c, "xmlns" ) ) \|\|
410	!( strcmp( cmp, XMLNS_SI ) == 0 ) \|\|
411	!( d = xt_find_node( c->children, "feature" ) ) \|\|
412	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
413	!( strcmp( cmp, XMLNS_FEATURE ) == 0 ) \|\|
414	!( d = xt_find_node( d->children, "x" ) ) \|\|
415	!( cmp = xt_find_attr( d, "xmlns" ) ) \|\|
416	!( strcmp( cmp, XMLNS_XDATA ) == 0 ) \|\|
417	!( cmp = xt_find_attr( d, "type" ) ) \|\|
418	!( strcmp( cmp, "submit" ) == 0 ) \|\|
419	!( d = xt_find_node( d->children, "field" ) ) \|\|
420	!( cmp = xt_find_attr( d, "var" ) ) \|\|
421	!( strcmp( cmp, "stream-method" ) == 0 ) \|\|
422	!( d = xt_find_node( d->children, "value" ) ) )
423	{
424	imcb_log( ic, "WARNING: Received incomplete Stream Initiation response" );
425	return XT_HANDLED;
426	}
427
428	if( !( strcmp( d->text, XMLNS_BYTESTREAMS ) == 0 ) ) {
429	/* since we should only have advertised what we can do and the peer should
430	* only have chosen what we offered, this should never happen */
431	imcb_log( ic, "WARNING: Received invalid Stream Initiation response, method %s", d->text );
432
433	return XT_HANDLED;
434	}
435
436	/* Let's see if we can find out what this bytestream should be for... */
437
438	for( tflist = jd->filetransfers ; tflist; tflist = g_slist_next(tflist) )
439	{
440	struct jabber_transfer *tft = tflist->data;
441	if( ( strcmp( tft->iq_id, iq_id ) == 0 ) )
442	{
443	tf = tft;
444	break;
445	}
446	}
447
448	if (!tf)
449	{
450	imcb_log( ic, "WARNING: Received bytestream request from %s that doesn't match an SI request", ini_jid );
451	return XT_HANDLED;
452	}
453
454	tf->ini_jid = g_strdup( ini_jid );
455	tf->tgt_jid = g_strdup( tgt_jid );
456
457	imcb_log( ic, "File %s: %s accepted the transfer!", tf->ft->file_name, tgt_jid );
458
459	jabber_bs_send_start( tf );
460
461	return XT_HANDLED;
462	}
463
464	int jabber_si_send_request(struct im_connection ic, char who, struct jabber_transfer *tf )
465	{
466	struct xt_node node, sinode;
467	struct jabber_buddy *bud;
468
469	/* who knows how many bits the future holds :) */
470	char filesizestr[ 1 + ( int ) ( 0.301029995663981198f * sizeof( size_t ) * 8 ) ];
471
472	const char *methods[] =
473	{
474	XMLNS_BYTESTREAMS,
475	//XMLNS_IBB,
476	NULL
477	};
478	const char **m;
479	char *s;
480
481	/* Maybe we should hash this? */
482	tf->sid = g_strdup_printf( "BitlBeeJabberSID%d", tf->ft->local_id );
483
484	if( ( s = strchr( who, '=' ) ) && jabber_chat_by_jid( ic, s + 1 ) )
485	bud = jabber_buddy_by_ext_jid( ic, who, 0 );
486	else
487	bud = jabber_buddy_by_jid( ic, who, 0 );
488
489	/* start with the SI tag */
490	sinode = xt_new_node( "si", NULL, NULL );
491	xt_add_attr( sinode, "xmlns", XMLNS_SI );
492	xt_add_attr( sinode, "profile", XMLNS_FILETRANSFER );
493	xt_add_attr( sinode, "id", tf->sid );
494
495	/* if( mimetype )
496	xt_add_attr( node, "mime-type", mimetype ); */
497
498	/* now the file tag */
499	/* if( desc )
500	node = xt_new_node( "desc", descr, NULL ); */
501	node = xt_new_node( "range", NULL, NULL );
502
503	sprintf( filesizestr, "%zd", tf->ft->file_size );
504	node = xt_new_node( "file", NULL, node );
505	xt_add_attr( node, "xmlns", XMLNS_FILETRANSFER );
506	xt_add_attr( node, "name", tf->ft->file_name );
507	xt_add_attr( node, "size", filesizestr );
508	/* if (hash)
509	xt_add_attr( node, "hash", hash );
510	if (date)
511	xt_add_attr( node, "date", date ); */
512
513	xt_add_child( sinode, node );
514
515	/* and finally the feature tag */
516	node = xt_new_node( "field", NULL, NULL );
517	xt_add_attr( node, "var", "stream-method" );
518	xt_add_attr( node, "type", "list-single" );
519
520	for ( m = methods ; *m ; m ++ )
521	xt_add_child( node, xt_new_node( "option", NULL, xt_new_node( "value", (char )m, NULL ) ) );
522
523	node = xt_new_node( "x", NULL, node );
524	xt_add_attr( node, "xmlns", XMLNS_XDATA );
525	xt_add_attr( node, "type", "form" );
526
527	node = xt_new_node( "feature", NULL, node );
528	xt_add_attr( node, "xmlns", XMLNS_FEATURE );
529
530	xt_add_child( sinode, node );
531
532	/* and we are there... */
533	node = jabber_make_packet( "iq", "set", bud ? bud->full_jid : who, sinode );
534	jabber_cache_add( ic, node, jabber_si_handle_response );
535	tf->iq_id = g_strdup( xt_find_attr( node, "id" ) );
536
537	return jabber_write_packet( ic, node );
538	}

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