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source: protocols/jabber/conference.c @ 1e2094e

Last change on this file since 1e2094e was c34247d, checked in by dequis <dx@…>, at 2015-11-23T17:38:11Z

jabber_chat_join_failed: add a null check before freeing the chat

Had this one in a stash, i think it's about trying to join a channel
with an invalid JID and getting an error with a different JID back, so
doing jabber_chat_by_jid() doesn't find it.

Property mode set to 100644

File size: 13.8 KB

Line
1	/***************************************************************************\
2	* *
3	* BitlBee - An IRC to IM gateway *
4	* Jabber module - Conference rooms *
5	* *
6	* Copyright 2007-2012 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 "sha1.h"
26
27	static xt_status jabber_chat_join_failed(struct im_connection ic, struct xt_node node, struct xt_node *orig);
28	static xt_status jabber_chat_self_message(struct im_connection ic, struct xt_node node, struct xt_node *orig);
29
30	struct groupchat jabber_chat_join(struct im_connection ic, const char room, const char nick, const char *password)
31	{
32	struct jabber_chat *jc;
33	struct xt_node *node;
34	struct groupchat *c;
35	char *roomjid;
36
37	roomjid = g_strdup_printf("%s/%s", room, nick);
38	node = xt_new_node("x", NULL, NULL);
39	xt_add_attr(node, "xmlns", XMLNS_MUC);
40	if (password) {
41	xt_add_child(node, xt_new_node("password", password, NULL));
42	}
43	node = jabber_make_packet("presence", NULL, roomjid, node);
44	jabber_cache_add(ic, node, jabber_chat_join_failed);
45
46	if (!jabber_write_packet(ic, node)) {
47	g_free(roomjid);
48	return NULL;
49	}
50
51	jc = g_new0(struct jabber_chat, 1);
52	jc->name = jabber_normalize(room);
53
54	if ((jc->me = jabber_buddy_add(ic, roomjid)) == NULL) {
55	g_free(roomjid);
56	g_free(jc->name);
57	g_free(jc);
58	return NULL;
59	}
60
61	/* roomjid isn't normalized yet, and we need an original version
62	of the nick to send a proper presence update. */
63	jc->my_full_jid = roomjid;
64
65	c = imcb_chat_new(ic, room);
66	c->data = jc;
67
68	return c;
69	}
70
71	struct groupchat jabber_chat_with(struct im_connection ic, char *who)
72	{
73	struct jabber_data *jd = ic->proto_data;
74	struct jabber_chat *jc;
75	struct groupchat *c;
76	sha1_state_t sum;
77	double now = gettime();
78	char uuid, rjid, *cserv;
79
80	sha1_init(&sum);
81	sha1_append(&sum, (uint8_t *) ic->acc->user, strlen(ic->acc->user));
82	sha1_append(&sum, (uint8_t *) &now, sizeof(now));
83	sha1_append(&sum, (uint8_t *) who, strlen(who));
84	uuid = sha1_random_uuid(&sum);
85
86	if (jd->flags & JFLAG_GTALK) {
87	cserv = g_strdup("groupchat.google.com");
88	} else {
89	/* Guess... */
90	cserv = g_strdup_printf("conference.%s", jd->server);
91	}
92
93	rjid = g_strdup_printf("private-chat-%s@%s", uuid, cserv);
94	g_free(uuid);
95	g_free(cserv);
96
97	c = jabber_chat_join(ic, rjid, jd->username, NULL);
98	g_free(rjid);
99	if (c == NULL) {
100	return NULL;
101	}
102
103	jc = c->data;
104	jc->invite = g_strdup(who);
105
106	return c;
107	}
108
109	static xt_status jabber_chat_join_failed(struct im_connection ic, struct xt_node node, struct xt_node *orig)
110	{
111	struct jabber_error *err;
112	struct jabber_buddy *bud;
113	char *room;
114
115	room = xt_find_attr(orig, "to");
116	bud = jabber_buddy_by_jid(ic, room, 0);
117	err = jabber_error_parse(xt_find_node(node->children, "error"), XMLNS_STANZA_ERROR);
118	if (err) {
119	imcb_error(ic, "Error joining groupchat %s: %s%s%s", room, err->code,
120	err->text ? ": " : "", err->text ? err->text : "");
121	jabber_error_free(err);
122	}
123	if (bud) {
124	struct groupchat *c = jabber_chat_by_jid(ic, bud->bare_jid);
125	if (c) {
126	jabber_chat_free(c);
127	}
128	}
129
130	return XT_HANDLED;
131	}
132
133	static xt_status jabber_chat_self_message(struct im_connection ic, struct xt_node node, struct xt_node *orig)
134	{
135	/* This is a self message sent by this bitlbee - just drop it */
136	return XT_ABORT;
137	}
138
139	struct groupchat jabber_chat_by_jid(struct im_connection ic, const char *name)
140	{
141	char *normalized = jabber_normalize(name);
142	GSList *l;
143	struct groupchat *ret;
144	struct jabber_chat *jc;
145
146	for (l = ic->groupchats; l; l = l->next) {
147	ret = l->data;
148	jc = ret->data;
149	if (strcmp(normalized, jc->name) == 0) {
150	break;
151	}
152	}
153	g_free(normalized);
154
155	return l ? ret : NULL;
156	}
157
158	void jabber_chat_free(struct groupchat *c)
159	{
160	struct jabber_chat *jc = c->data;
161
162	jabber_buddy_remove_bare(c->ic, jc->name);
163
164	g_free(jc->my_full_jid);
165	g_free(jc->name);
166	g_free(jc->invite);
167	g_free(jc);
168
169	imcb_chat_free(c);
170	}
171
172	int jabber_chat_msg(struct groupchat c, char message, int flags)
173	{
174	struct im_connection *ic = c->ic;
175	struct jabber_chat *jc = c->data;
176	struct xt_node *node;
177
178	jc->flags \|= JCFLAG_MESSAGE_SENT;
179
180	node = xt_new_node("body", message, NULL);
181	node = jabber_make_packet("message", "groupchat", jc->name, node);
182
183	jabber_cache_add(ic, node, jabber_chat_self_message);
184
185	return !jabber_write_packet(ic, node);
186	}
187
188	int jabber_chat_topic(struct groupchat c, char topic)
189	{
190	struct im_connection *ic = c->ic;
191	struct jabber_chat *jc = c->data;
192	struct xt_node *node;
193
194	node = xt_new_node("subject", topic, NULL);
195	node = jabber_make_packet("message", "groupchat", jc->name, node);
196
197	if (!jabber_write_packet(ic, node)) {
198	xt_free_node(node);
199	return 0;
200	}
201	xt_free_node(node);
202
203	return 1;
204	}
205
206	int jabber_chat_leave(struct groupchat c, const char reason)
207	{
208	struct im_connection *ic = c->ic;
209	struct jabber_chat *jc = c->data;
210	struct xt_node *node;
211
212	node = xt_new_node("x", NULL, NULL);
213	xt_add_attr(node, "xmlns", XMLNS_MUC);
214	node = jabber_make_packet("presence", "unavailable", jc->my_full_jid, node);
215
216	if (!jabber_write_packet(ic, node)) {
217	xt_free_node(node);
218	return 0;
219	}
220	xt_free_node(node);
221
222	return 1;
223	}
224
225	void jabber_chat_invite(struct groupchat c, char who, char *message)
226	{
227	struct xt_node *node;
228	struct im_connection *ic = c->ic;
229	struct jabber_chat *jc = c->data;
230
231	node = xt_new_node("reason", message, NULL);
232
233	node = xt_new_node("invite", NULL, node);
234	xt_add_attr(node, "to", who);
235
236	node = xt_new_node("x", NULL, node);
237	xt_add_attr(node, "xmlns", XMLNS_MUC_USER);
238
239	node = jabber_make_packet("message", NULL, jc->name, node);
240
241	jabber_write_packet(ic, node);
242
243	xt_free_node(node);
244	}
245
246	/* Not really the same syntax as the normal pkt_ functions, but this isn't
247	called by the xmltree parser directly and this way I can add some extra
248	parameters so we won't have to repeat too many things done by the caller
249	already. */
250	void jabber_chat_pkt_presence(struct im_connection ic, struct jabber_buddy bud, struct xt_node *node)
251	{
252	struct groupchat *chat;
253	struct xt_node *c;
254	char *type = xt_find_attr(node, "type");
255	struct jabber_data *jd = ic->proto_data;
256	struct jabber_chat *jc;
257	char *s;
258
259	if ((chat = jabber_chat_by_jid(ic, bud->bare_jid)) == NULL) {
260	/* How could this happen?? We could do kill( self, 11 )
261	now or just wait for the OS to do it. :-) */
262	return;
263	}
264
265	jc = chat->data;
266
267	if (type == NULL && !(bud->flags & JBFLAG_IS_CHATROOM)) {
268	bud->flags \|= JBFLAG_IS_CHATROOM;
269	/* If this one wasn't set yet, this buddy just joined the chat.
270	Slightly hackish way of finding out eh? ;-) */
271
272	/* This is pretty messy... Here it sets ext_jid to the real
273	JID of the participant. Works for non-anonymized channels.
274	Might break if someone joins a chat twice, though. */
275	for (c = node->children; (c = xt_find_node(c, "x")); c = c->next) {
276	if ((s = xt_find_attr(c, "xmlns")) &&
277	(strcmp(s, XMLNS_MUC_USER) == 0)) {
278	struct xt_node *item;
279
280	item = xt_find_node(c->children, "item");
281	if ((s = xt_find_attr(item, "jid"))) {
282	/* Yay, found what we need. :-) */
283	bud->ext_jid = jabber_normalize(s);
284	break;
285	}
286	}
287	}
288
289	/* Make up some other handle, if necessary. */
290	if (bud->ext_jid == NULL) {
291	if (bud == jc->me) {
292	bud->ext_jid = g_strdup(jd->me);
293	} else {
294	int i;
295
296	/* Don't want the nick to be at the end, so let's
297	think of some slightly different notation to use
298	for anonymous groupchat participants in BitlBee. */
299	bud->ext_jid = g_strdup_printf("%s=%s", bud->resource, bud->bare_jid);
300
301	/* And strip any unwanted characters. */
302	for (i = 0; bud->resource[i]; i++) {
303	if (bud->ext_jid[i] == '=' \|\| bud->ext_jid[i] == '@') {
304	bud->ext_jid[i] = '_';
305	}
306	}
307	}
308	bud->flags \|= JBFLAG_IS_ANONYMOUS;
309	}
310
311	if (bud != jc->me && bud->flags & JBFLAG_IS_ANONYMOUS) {
312	/* If JIDs are anonymized, add them to the local
313	list for the duration of this chat. */
314	imcb_add_buddy(ic, bud->ext_jid, NULL);
315	imcb_buddy_nick_hint(ic, bud->ext_jid, bud->resource);
316	}
317
318	if (bud == jc->me && jc->invite != NULL) {
319	char *msg = g_strdup_printf("Please join me in room %s", jc->name);
320	jabber_chat_invite(chat, jc->invite, msg);
321	g_free(jc->invite);
322	g_free(msg);
323	jc->invite = NULL;
324	}
325
326	s = strchr(bud->ext_jid, '/');
327	if (s) {
328	s = 0; / Should NEVER be NULL, but who knows... */
329	}
330	imcb_chat_add_buddy(chat, bud->ext_jid);
331	if (s) {
332	*s = '/';
333	}
334	} else if (type) { /* type can only be NULL or "unavailable" in this function */
335	if ((bud->flags & JBFLAG_IS_CHATROOM) && bud->ext_jid) {
336	char *reason = NULL;
337	char *status = NULL;
338	char *status_text = NULL;
339
340	if ((c = xt_find_node_by_attr(node->children, "x", "xmlns", XMLNS_MUC_USER))) {
341	struct xt_node *c2 = c->children;
342
343	while ((c2 = xt_find_node(c2, "status"))) {
344	char *code = xt_find_attr(c2, "code");
345	if (g_strcmp0(code, "301") == 0) {
346	status = "Banned";
347	break;
348	} else if (g_strcmp0(code, "303") == 0) {
349	/* This could be handled in a cleverer way,
350	* but let's just show a literal part/join for now */
351	status = "Changing nicks";
352	break;
353	} else if (g_strcmp0(code, "307") == 0) {
354	status = "Kicked";
355	break;
356	}
357	c2 = c2->next;
358	}
359
360	/* Sometimes the status message is in presence/x/item/reason */
361	if ((c2 = xt_find_path(c, "item/reason")) && c2->text && c2->text_len) {
362	status_text = c2->text;
363	}
364	}
365
366	/* Sometimes the status message is right inside <presence> */
367	if ((c = xt_find_node(node->children, "status")) && c->text && c->text_len) {
368	status_text = c->text;
369	}
370
371	if (status_text && status) {
372	reason = g_strdup_printf("%s: %s", status, status_text);
373	} else {
374	reason = g_strdup(status_text ? : status);
375	}
376
377	s = strchr(bud->ext_jid, '/');
378	if (s) {
379	*s = 0;
380	}
381	imcb_chat_remove_buddy(chat, bud->ext_jid, reason);
382	if (bud != jc->me && bud->flags & JBFLAG_IS_ANONYMOUS) {
383	imcb_remove_buddy(ic, bud->ext_jid, reason);
384	}
385	if (s) {
386	*s = '/';
387	}
388
389	g_free(reason);
390	}
391
392	if (bud == jc->me) {
393	jabber_chat_free(chat);
394	}
395	}
396	}
397
398	void jabber_chat_pkt_message(struct im_connection ic, struct jabber_buddy bud, struct xt_node *node)
399	{
400	struct xt_node *subject = xt_find_node(node->children, "subject");
401	struct xt_node *body = xt_find_node(node->children, "body");
402	struct groupchat *chat = NULL;
403	struct jabber_chat *jc = NULL;
404	char *from = NULL;
405	char *nick = NULL;
406	char *final_from = NULL;
407	char *bare_jid = NULL;
408	guint32 flags = 0;
409
410	from = (bud) ? bud->full_jid : xt_find_attr(node, "from");
411
412	if (from) {
413	nick = strchr(from, '/');
414	if (nick) {
415	*nick = 0;
416	}
417	chat = jabber_chat_by_jid(ic, from);
418	if (nick) {
419	*nick = '/';
420	nick++;
421	}
422	}
423
424	jc = (chat) ? chat->data : NULL;
425
426	if (!bud) {
427	struct xt_node *c;
428	char *s;
429
430	/* Try some clever stuff to find out the real JID here */
431	c = xt_find_node_by_attr(node->children, "delay", "xmlns", XMLNS_DELAY);
432
433	if (c && ((s = xt_find_attr(c, "from")) \|\|
434	(s = xt_find_attr(c, "from_jid")))) {
435	/* This won't be useful if it's the MUC JID */
436	if (!(jc && jabber_compare_jid(s, jc->name))) {
437	/* Hopefully this one makes more sense! */
438	bud = jabber_buddy_by_jid(ic, s, GET_BUDDY_FIRST \| GET_BUDDY_CREAT);
439	}
440	}
441
442	}
443
444	if (subject && chat) {
445	char *subject_text = subject->text_len > 0 ? subject->text : "";
446	if (g_strcmp0(chat->topic, subject_text) != 0) {
447	bare_jid = (bud) ? jabber_get_bare_jid(bud->ext_jid) : NULL;
448	imcb_chat_topic(chat, bare_jid, subject_text,
449	jabber_get_timestamp(node));
450	g_free(bare_jid);
451	bare_jid = NULL;
452	}
453	}
454
455	if (body == NULL \|\| body->text_len == 0) {
456	/* Meh. Empty messages aren't very interesting, no matter
457	how much some servers love to send them. */
458	return;
459	}
460
461	if (chat == NULL) {
462	if (nick == NULL) {
463	imcb_log(ic, "System message from unknown groupchat %s: %s", from, body->text);
464	} else {
465	imcb_log(ic, "Groupchat message from unknown JID %s: %s", from, body->text);
466	}
467
468	return;
469	} else if (chat != NULL && bud == NULL && nick == NULL) {
470	imcb_chat_log(chat, "From conference server: %s", body->text);
471	return;
472	} else if (jc && jc->flags & JCFLAG_MESSAGE_SENT && bud == jc->me &&
473	(jabber_cache_handle_packet(ic, node) == XT_ABORT)) {
474	/* Self message marked by this bitlbee, don't show it */
475	return;
476	}
477
478	if (bud) {
479	bare_jid = jabber_get_bare_jid(bud->ext_jid ? bud->ext_jid : bud->full_jid);
480	final_from = bare_jid;
481	flags = (bud == jc->me) ? OPT_SELFMESSAGE : 0;
482	} else {
483	final_from = nick;
484	}
485
486	imcb_chat_msg(chat, final_from, body->text, flags, jabber_get_timestamp(node));
487
488	g_free(bare_jid);
489	}

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