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io.c @ 4107fea

Last change on this file since 4107fea was 5ebff60, checked in by dequis <dx@…>, at 2015-02-20T22:50:54Z

Reindent everything to K&R style with tabs

Used uncrustify, with the configuration file in ./doc/uncrustify.cfg

Commit author set to "Indent <please@…>" so that it's easier to
skip while doing git blame.

Property mode set to 100644

File size: 16.8 KB

Line
1	/***************************************************************************\
2	* *
3	* BitlBee - An IRC to IM gateway *
4	* Jabber module - I/O stuff (plain, SSL), queues, etc *
5	* *
6	* Copyright 2006-2012 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 "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 && !(ic->flags & OPT_LOGGING_OUT)) {
48	char msg, s;
49
50	msg = g_strdup_printf("TX: %s", buf);
51	/* Don't include auth info in XML logs. */
52	if (strncmp(msg, "TX: <auth ", 10) == 0 && (s = strchr(msg, '>'))) {
53	s++;
54	while (s && s != '<') {
55	(s++) = '';
56	}
57	}
58	imcb_buddy_msg(ic, JABBER_XMLCONSOLE_HANDLE, msg, 0, 0);
59	g_free(msg);
60	}
61
62	if (jd->tx_len == 0) {
63	/* If the queue is empty, allocate a new buffer. */
64	jd->tx_len = len;
65	jd->txq = g_memdup(buf, len);
66
67	/* Try if we can write it immediately so we don't have to do
68	it via the event handler. If not, add the handler. (In
69	most cases it probably won't be necessary.) */
70	if ((ret = jabber_write_queue(ic)) && jd->tx_len > 0) {
71	jd->w_inpa = b_input_add(jd->fd, B_EV_IO_WRITE, jabber_write_callback, ic);
72	}
73	} else {
74	/* Just add it to the buffer if it's already filled. The
75	event handler is already set. */
76	jd->txq = g_renew(char, jd->txq, jd->tx_len + len);
77	memcpy(jd->txq + jd->tx_len, buf, len);
78	jd->tx_len += len;
79
80	/* The return value for write() doesn't necessarily mean
81	that everything got sent, it mainly means that the
82	connection (officially) still exists and can still
83	be accessed without hitting SIGSEGV. IOW: */
84	ret = TRUE;
85	}
86
87	return ret;
88	}
89
90	/* Splitting up in two separate functions: One to use as a callback and one
91	to use in the function above to escape from having to wait for the event
92	handler to call us, if possible.
93
94	Two different functions are necessary because of the return values: The
95	callback should only return TRUE if the write was successful AND if the
96	buffer is not empty yet (ie. if the handler has to be called again when
97	the socket is ready for more data). */
98	static gboolean jabber_write_callback(gpointer data, gint fd, b_input_condition cond)
99	{
100	struct jabber_data jd = ((struct im_connection ) data)->proto_data;
101
102	return jd->fd != -1 &&
103	jabber_write_queue(data) &&
104	jd->tx_len > 0;
105	}
106
107	static gboolean jabber_write_queue(struct im_connection *ic)
108	{
109	struct jabber_data *jd = ic->proto_data;
110	int st;
111
112	if (jd->ssl) {
113	st = ssl_write(jd->ssl, jd->txq, jd->tx_len);
114	} else {
115	st = write(jd->fd, jd->txq, jd->tx_len);
116	}
117
118	if (st == jd->tx_len) {
119	/* We wrote everything, clear the buffer. */
120	g_free(jd->txq);
121	jd->txq = NULL;
122	jd->tx_len = 0;
123
124	return TRUE;
125	} else if (st == 0 \|\| (st < 0 && !ssl_sockerr_again(jd->ssl))) {
126	/* Set fd to -1 to make sure we won't write to it anymore. */
127	closesocket(jd->fd); /* Shouldn't be necessary after errors? */
128	jd->fd = -1;
129
130	imcb_error(ic, "Short write() to server");
131	imc_logout(ic, TRUE);
132	return FALSE;
133	} else if (st > 0) {
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	} else {
143	/* Just in case we had EINPROGRESS/EAGAIN: */
144
145	return TRUE;
146	}
147	}
148
149	static gboolean jabber_read_callback(gpointer data, gint fd, b_input_condition cond)
150	{
151	struct im_connection *ic = data;
152	struct jabber_data *jd = ic->proto_data;
153	char buf[512];
154	int st;
155
156	if (jd->fd == -1) {
157	return FALSE;
158	}
159
160	if (jd->ssl) {
161	st = ssl_read(jd->ssl, buf, sizeof(buf));
162	} else {
163	st = read(jd->fd, buf, sizeof(buf));
164	}
165
166	if (st > 0) {
167	/* Parse. */
168	if (xt_feed(jd->xt, buf, st) < 0) {
169	imcb_error(ic, "XML stream error");
170	imc_logout(ic, TRUE);
171	return FALSE;
172	}
173
174	/* Execute all handlers. */
175	if (!xt_handle(jd->xt, NULL, 1)) {
176	/* Don't do anything, the handlers should have
177	aborted the connection already. */
178	return FALSE;
179	}
180
181	if (jd->flags & JFLAG_STREAM_RESTART) {
182	jd->flags &= ~JFLAG_STREAM_RESTART;
183	jabber_start_stream(ic);
184	}
185
186	/* Garbage collection. */
187	xt_cleanup(jd->xt, NULL, 1);
188
189	/* This is a bit hackish, unfortunately. Although xmltree
190	has nifty event handler stuff, it only calls handlers
191	when nodes are complete. Since the server should only
192	send an opening <stream:stream> tag, we have to check
193	this by hand. :-( */
194	if (!(jd->flags & JFLAG_STREAM_STARTED) && jd->xt && jd->xt->root) {
195	if (g_strcasecmp(jd->xt->root->name, "stream:stream") == 0) {
196	jd->flags \|= JFLAG_STREAM_STARTED;
197
198	/* If there's no version attribute, assume
199	this is an old server that can't do SASL
200	authentication. */
201	if (!set_getbool(&ic->acc->set, "sasl") \|\| !sasl_supported(ic)) {
202	/* If there's no version= tag, we suppose
203	this server does NOT implement: XMPP 1.0,
204	SASL and TLS. */
205	if (set_getbool(&ic->acc->set, "tls")) {
206	imcb_error(ic, "TLS is turned on for this "
207	"account, but is not supported by this server");
208	imc_logout(ic, FALSE);
209	return FALSE;
210	} else {
211	return jabber_init_iq_auth(ic);
212	}
213	}
214	} else {
215	imcb_error(ic, "XML stream error");
216	imc_logout(ic, TRUE);
217	return FALSE;
218	}
219	}
220	} else if (st == 0 \|\| (st < 0 && !ssl_sockerr_again(jd->ssl))) {
221	closesocket(jd->fd);
222	jd->fd = -1;
223
224	imcb_error(ic, "Error while reading from server");
225	imc_logout(ic, TRUE);
226	return FALSE;
227	}
228
229	if (ssl_pending(jd->ssl)) {
230	/* OpenSSL empties the TCP buffers completely but may keep some
231	data in its internap buffers. select() won't see that, but
232	ssl_pending() does. */
233	return jabber_read_callback(data, fd, cond);
234	} else {
235	return TRUE;
236	}
237	}
238
239	gboolean jabber_connected_plain(gpointer data, gint source, b_input_condition cond)
240	{
241	struct im_connection *ic = data;
242
243	if (g_slist_find(jabber_connections, ic) == NULL) {
244	return FALSE;
245	}
246
247	if (source == -1) {
248	imcb_error(ic, "Could not connect to server");
249	imc_logout(ic, TRUE);
250	return FALSE;
251	}
252
253	imcb_log(ic, "Connected to server, logging in");
254
255	return jabber_start_stream(ic);
256	}
257
258	gboolean jabber_connected_ssl(gpointer data, int returncode, void *source, b_input_condition cond)
259	{
260	struct im_connection *ic = data;
261	struct jabber_data *jd;
262
263	if (g_slist_find(jabber_connections, ic) == NULL) {
264	return FALSE;
265	}
266
267	jd = ic->proto_data;
268
269	if (source == NULL) {
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	if (returncode != 0) {
275	char *err = ssl_verify_strerror(returncode);
276	imcb_error(ic, "Certificate verification problem 0x%x: %s",
277	returncode, err ? err : "Unknown");
278	g_free(err);
279	imc_logout(ic, FALSE);
280	} else {
281	imcb_error(ic, "Could not connect to server");
282	imc_logout(ic, TRUE);
283	}
284
285	return FALSE;
286	}
287
288	imcb_log(ic, "Connected to server, logging in");
289
290	return jabber_start_stream(ic);
291	}
292
293	static xt_status jabber_end_of_stream(struct xt_node *node, gpointer data)
294	{
295	imc_logout(data, TRUE);
296	return XT_ABORT;
297	}
298
299	static xt_status jabber_pkt_features(struct xt_node *node, gpointer data)
300	{
301	struct im_connection *ic = data;
302	struct jabber_data *jd = ic->proto_data;
303	struct xt_node c, reply;
304	int trytls;
305
306	trytls = g_strcasecmp(set_getstr(&ic->acc->set, "tls"), "try") == 0;
307	c = xt_find_node(node->children, "starttls");
308	if (c && !jd->ssl) {
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	imcb_error(ic, "Server requires TLS connections, but TLS is turned off for this account");
316	imc_logout(ic, FALSE);
317
318	return XT_ABORT;
319	}
320
321	/* Only run this if the tls setting is set to true or try: */
322	if ((trytls \|\| set_getbool(&ic->acc->set, "tls"))) {
323	reply = xt_new_node("starttls", NULL, NULL);
324	xt_add_attr(reply, "xmlns", XMLNS_TLS);
325	if (!jabber_write_packet(ic, reply)) {
326	xt_free_node(reply);
327	return XT_ABORT;
328	}
329	xt_free_node(reply);
330
331	return XT_HANDLED;
332	}
333	} else if (!c && !jd->ssl) {
334	/* If the server does not advertise the STARTTLS feature and
335	we're not in a secure connection already: (Servers have a
336	habit of not advertising <starttls/> anymore when already
337	using SSL/TLS. */
338
339	if (!trytls && set_getbool(&ic->acc->set, "tls")) {
340	imcb_error(ic, "TLS is turned on for this account, but is not supported by this server");
341	imc_logout(ic, FALSE);
342
343	return XT_ABORT;
344	}
345	}
346
347	/* This one used to be in jabber_handlers[], but it has to be done
348	from here to make sure the TLS session will be initialized
349	properly before we attempt SASL authentication. */
350	if ((c = xt_find_node(node->children, "mechanisms"))) {
351	if (sasl_pkt_mechanisms(c, data) == XT_ABORT) {
352	return XT_ABORT;
353	}
354	}
355	/* If the server SEEMS to support SASL authentication but doesn't
356	support it after all, we should try to do authentication the
357	other way. jabber.com doesn't seem to do SASL while it pretends
358	to be XMPP 1.0 compliant! */
359	else if (!(jd->flags & JFLAG_AUTHENTICATED) && set_getbool(&ic->acc->set, "sasl") && sasl_supported(ic)) {
360	if (!jabber_init_iq_auth(ic)) {
361	return XT_ABORT;
362	}
363	}
364
365	if ((c = xt_find_node(node->children, "bind"))) {
366	jd->flags \|= JFLAG_WANT_BIND;
367	}
368
369	if ((c = xt_find_node(node->children, "session"))) {
370	jd->flags \|= JFLAG_WANT_SESSION;
371	}
372
373	if (jd->flags & JFLAG_AUTHENTICATED) {
374	return jabber_pkt_bind_sess(ic, NULL, NULL);
375	}
376
377	return XT_HANDLED;
378	}
379
380	static xt_status jabber_pkt_proceed_tls(struct xt_node *node, gpointer data)
381	{
382	struct im_connection *ic = data;
383	struct jabber_data *jd = ic->proto_data;
384	char xmlns, tlsname;
385
386	xmlns = xt_find_attr(node, "xmlns");
387
388	/* Just ignore it when it doesn't seem to be TLS-related (is that at
389	all possible??). */
390	if (!xmlns \|\| strcmp(xmlns, XMLNS_TLS) != 0) {
391	return XT_HANDLED;
392	}
393
394	/* We don't want event handlers to touch our TLS session while it's
395	still initializing! */
396	b_event_remove(jd->r_inpa);
397	if (jd->tx_len > 0) {
398	/* Actually the write queue should be empty here, but just
399	to be sure... */
400	b_event_remove(jd->w_inpa);
401	g_free(jd->txq);
402	jd->txq = NULL;
403	jd->tx_len = 0;
404	}
405	jd->w_inpa = jd->r_inpa = 0;
406
407	imcb_log(ic, "Converting stream to TLS");
408
409	jd->flags \|= JFLAG_STARTTLS_DONE;
410
411	/* If the user specified a server for the account, use this server as the
412	* hostname in the certificate verification. Else we use the domain from
413	* the username. */
414	if (ic->acc->server && *ic->acc->server) {
415	tlsname = ic->acc->server;
416	} else {
417	tlsname = jd->server;
418	}
419
420	jd->ssl = ssl_starttls(jd->fd, tlsname, set_getbool(&ic->acc->set, "tls_verify"),
421	jabber_connected_ssl, ic);
422
423	return XT_HANDLED;
424	}
425
426	static xt_status jabber_pkt_stream_error(struct xt_node *node, gpointer data)
427	{
428	struct im_connection *ic = data;
429	struct jabber_data *jd = ic->proto_data;
430	int allow_reconnect = TRUE;
431	struct jabber_error *err;
432	struct xt_node *host;
433
434	if (!(ic->flags & OPT_LOGGED_IN) &&
435	(host = xt_find_node(node->children, "see-other-host")) &&
436	host->text) {
437	char *s;
438	int port = set_getint(&ic->acc->set, "port");
439
440	/* Let's try to obey this request, if we're not logged
441	in yet (i.e. not have too much state yet). */
442	if (jd->ssl) {
443	ssl_disconnect(jd->ssl);
444	}
445	closesocket(jd->fd);
446	b_event_remove(jd->r_inpa);
447	b_event_remove(jd->w_inpa);
448
449	jd->ssl = NULL;
450	jd->r_inpa = jd->w_inpa = 0;
451	jd->flags &= JFLAG_XMLCONSOLE;
452
453	s = strchr(host->text, ':');
454	if (s != NULL) {
455	sscanf(s + 1, "%d", &port);
456	}
457
458	imcb_log(ic, "Redirected to %s", host->text);
459	jd->fd = proxy_connect(host->text, port, jabber_connected_plain, ic);
460
461	return XT_ABORT;
462	}
463
464	err = jabber_error_parse(node, XMLNS_STREAM_ERROR);
465
466	/* Tssk... */
467	if (err->code == NULL) {
468	imcb_error(ic, "Unknown stream error reported by server");
469	imc_logout(ic, allow_reconnect);
470	jabber_error_free(err);
471	return XT_ABORT;
472	}
473
474	/* We know that this is a fatal error. If it's a "conflict" error, we
475	should turn off auto-reconnect to make sure we won't get some nasty
476	infinite loop! */
477	if (strcmp(err->code, "conflict") == 0) {
478	imcb_error(ic, "Account and resource used from a different location");
479	allow_reconnect = FALSE;
480	} else if (strcmp(err->code, "not-authorized") == 0) {
481	imcb_error(ic, "Not authorized");
482	allow_reconnect = FALSE;
483	} else {
484	imcb_error(ic, "Stream error: %s%s%s", err->code, err->text ? ": " : "",
485	err->text ? err->text : "");
486	}
487
488	jabber_error_free(err);
489	imc_logout(ic, allow_reconnect);
490
491	return XT_ABORT;
492	}
493
494	static xt_status jabber_xmlconsole(struct xt_node *node, gpointer data)
495	{
496	struct im_connection *ic = data;
497	struct jabber_data *jd = ic->proto_data;
498
499	if (jd->flags & JFLAG_XMLCONSOLE) {
500	char msg, pkt;
501
502	pkt = xt_to_string(node);
503	msg = g_strdup_printf("RX: %s", pkt);
504	imcb_buddy_msg(ic, JABBER_XMLCONSOLE_HANDLE, msg, 0, 0);
505	g_free(msg);
506	g_free(pkt);
507	}
508
509	return XT_NEXT;
510	}
511
512	static const struct xt_handler_entry jabber_handlers[] = {
513	{ NULL, "stream:stream", jabber_xmlconsole },
514	{ "stream:stream", "<root>", jabber_end_of_stream },
515	{ "message", "stream:stream", jabber_pkt_message },
516	{ "presence", "stream:stream", jabber_pkt_presence },
517	{ "iq", "stream:stream", jabber_pkt_iq },
518	{ "stream:features", "stream:stream", jabber_pkt_features },
519	{ "stream:error", "stream:stream", jabber_pkt_stream_error },
520	{ "proceed", "stream:stream", jabber_pkt_proceed_tls },
521	{ "challenge", "stream:stream", sasl_pkt_challenge },
522	{ "success", "stream:stream", sasl_pkt_result },
523	{ "failure", "stream:stream", sasl_pkt_result },
524	{ NULL, NULL, NULL }
525	};
526
527	gboolean jabber_start_stream(struct im_connection *ic)
528	{
529	struct jabber_data *jd = ic->proto_data;
530	int st;
531	char *greet;
532
533	/* We'll start our stream now, so prepare everything to receive one
534	from the server too. */
535	xt_free(jd->xt); /* In case we're RE-starting. */
536	jd->xt = xt_new(jabber_handlers, ic);
537
538	if (jd->r_inpa <= 0) {
539	jd->r_inpa = b_input_add(jd->fd, B_EV_IO_READ, jabber_read_callback, ic);
540	}
541
542	greet = g_strdup_printf("%s<stream:stream to=\"%s\" xmlns=\"jabber:client\" "
543	"xmlns:stream=\"http://etherx.jabber.org/streams\" version=\"1.0\">",
544	(jd->flags & JFLAG_STARTTLS_DONE) ? "" : "<?xml version='1.0' ?>",
545	jd->server);
546
547	st = jabber_write(ic, greet, strlen(greet));
548
549	g_free(greet);
550
551	return st;
552	}
553
554	void jabber_end_stream(struct im_connection *ic)
555	{
556	struct jabber_data *jd = ic->proto_data;
557
558	/* Let's only do this if the queue is currently empty, otherwise it'd
559	take too long anyway. */
560	if (jd->tx_len == 0) {
561	char eos[] = "</stream:stream>";
562	struct xt_node *node;
563	int st = 1;
564
565	if (ic->flags & OPT_LOGGED_IN) {
566	node = jabber_make_packet("presence", "unavailable", NULL, NULL);
567	st = jabber_write_packet(ic, node);
568	xt_free_node(node);
569	}
570
571	if (st) {
572	jabber_write(ic, eos, strlen(eos));
573	}
574	}
575	}

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source: protocols/jabber/io.c @ 4107fea

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