summaryrefslogtreecommitdiff
path: root/src/timeserver.c
blob: fc83f9aecc69d4b532a5762ae2af7981670da5fa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
/*
 *
 *  Connection Manager
 *
 *  Copyright (C) 2007-2013  Intel Corporation. All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <errno.h>

#include <glib.h>
#include <stdlib.h>
#include <gweb/gresolv.h>
#include <netdb.h>

#include "connman.h"

#define TS_RECHECK_INTERVAL     7200

static GSList *ts_list = NULL;
static char *ts_current = NULL;
static int ts_recheck_id = 0;

static GResolv *resolv = NULL;
static int resolv_id = 0;

static void resolv_debug(const char *str, void *data)
{
	connman_info("%s: %s\n", (const char *) data, str);
}
static void save_timeservers(char **servers)
{
	GKeyFile *keyfile;
	int cnt;

	keyfile = __connman_storage_load_global();
	if (!keyfile)
		keyfile = g_key_file_new();

	for (cnt = 0; servers && servers[cnt]; cnt++);

	g_key_file_set_string_list(keyfile, "global", "Timeservers",
			   (const gchar **)servers, cnt);

	__connman_storage_save_global(keyfile);

	g_key_file_free(keyfile);

	return;
}

static char **load_timeservers(void)
{
	GKeyFile *keyfile;
	char **servers = NULL;

	keyfile = __connman_storage_load_global();
	if (!keyfile)
		return NULL;

	servers = g_key_file_get_string_list(keyfile, "global",
						"Timeservers", NULL, NULL);

	g_key_file_free(keyfile);

	return servers;
}

static void resolv_result(GResolvResultStatus status, char **results,
				gpointer user_data)
{
	int i;

#if defined TIZEN_EXT
	gchar *server = NULL;

	server = g_strdup((gchar *)user_data);
	ts_list = g_slist_append(ts_list, server);

	DBG("added server %s", server);
#endif

	DBG("status %d", status);

	if (status == G_RESOLV_RESULT_STATUS_SUCCESS) {
		if (results) {
			for (i = 0; results[i]; i++) {
				DBG("result[%d]: %s", i, results[i]);
				if (i == 0)
					continue;

				ts_list = __connman_timeserver_add_list(
							ts_list, results[i]);
			}

			DBG("Using timeserver %s", results[0]);

			__connman_ntp_start(results[0]);

			return;
		}
	}

	/* If resolving fails, move to the next server */
	__connman_timeserver_sync_next();
}

/*
 * Once the timeserver list (ts_list) is created, we start querying the
 * servers one by one. If resolving fails on one of them, we move to the
 * next one. The user can enter either an IP address or a URL for the
 * timeserver. We only resolve the URLs. Once we have an IP for the NTP
 * server, we start querying it for time corrections.
 */
void __connman_timeserver_sync_next()
{
	if (ts_current) {
		g_free(ts_current);
		ts_current = NULL;
	}

	__connman_ntp_stop();

	/* Get the 1st server in the list */
	if (!ts_list)
		return;

	ts_current = ts_list->data;

	ts_list = g_slist_delete_link(ts_list, ts_list);

	/* if it's an IP, directly query it. */
	if (connman_inet_check_ipaddress(ts_current) > 0) {
		DBG("Using timeserver %s", ts_current);

		__connman_ntp_start(ts_current);

		return;
	}

	DBG("Resolving timeserver %s", ts_current);

#if defined TIZEN_EXT
	resolv_id = g_resolv_lookup_hostname(resolv, ts_current,
						resolv_result, ts_current);
#else
	resolv_id = g_resolv_lookup_hostname(resolv, ts_current,
						resolv_result, NULL);
#endif

	return;
}

GSList *__connman_timeserver_add_list(GSList *server_list,
		const char *timeserver)
{
	GSList *list = server_list;

	if (!timeserver)
		return server_list;

	while (list) {
		char *existing_server = list->data;
		if (strcmp(timeserver, existing_server) == 0)
			return server_list;
		list = g_slist_next(list);
	}
	return g_slist_prepend(server_list, g_strdup(timeserver));
}

/*
 * __connman_timeserver_get_all function creates the timeserver
 * list which will be used to determine NTP server for time corrections.
 * The service settings take priority over the global timeservers.
 */
GSList *__connman_timeserver_get_all(struct connman_service *service)
{
	GSList *list = NULL;
	struct connman_network *network;
	char **timeservers;
	char **service_ts;
	char **service_ts_config;
	const char *service_gw;
	char **fallback_ts;
	int index, i;

	if (__connman_clock_timeupdates() == TIME_UPDATES_MANUAL)
		return NULL;

	service_ts_config = connman_service_get_timeservers_config(service);

	/* First add Service Timeservers.Configuration to the list */
	for (i = 0; service_ts_config && service_ts_config[i];
			i++)
		list = __connman_timeserver_add_list(list,
				service_ts_config[i]);

	service_ts = connman_service_get_timeservers(service);

	/* Then add Service Timeservers via DHCP to the list */
	for (i = 0; service_ts && service_ts[i]; i++)
		list = __connman_timeserver_add_list(list, service_ts[i]);

	network = __connman_service_get_network(service);
	if (network) {
		index = connman_network_get_index(network);
		service_gw = __connman_ipconfig_get_gateway_from_index(index,
			CONNMAN_IPCONFIG_TYPE_ALL);

		/* Then add Service Gateway to the list */
		if (service_gw)
			list = __connman_timeserver_add_list(list, service_gw);
	}

	/* Then add Global Timeservers to the list */
	timeservers = load_timeservers();

	for (i = 0; timeservers && timeservers[i]; i++)
		list = __connman_timeserver_add_list(list, timeservers[i]);

	g_strfreev(timeservers);

	fallback_ts = connman_setting_get_string_list("FallbackTimeservers");

	/* Lastly add the fallback servers */
	for (i = 0; fallback_ts && fallback_ts[i]; i++)
		list = __connman_timeserver_add_list(list, fallback_ts[i]);

	return g_slist_reverse(list);
}

static gboolean ts_recheck(gpointer user_data)
{
	GSList *ts;

	ts = __connman_timeserver_get_all(__connman_service_get_default());

	if (!ts) {
		DBG("timeservers disabled");

		return TRUE;
	}

	if (g_strcmp0(ts_current, ts->data) != 0) {
		DBG("current %s preferred %s", ts_current, (char *)ts->data);

		g_slist_free_full(ts, g_free);

		__connman_timeserver_sync(NULL);

		return FALSE;
	}

	DBG("");

	g_slist_free_full(ts, g_free);

	return TRUE;
}

static void ts_recheck_disable(void)
{
	if (ts_recheck_id == 0)
		return;

	g_source_remove(ts_recheck_id);
	ts_recheck_id = 0;

	if (ts_current) {
		g_free(ts_current);
		ts_current = NULL;
	}
}

static void ts_recheck_enable(void)
{
	if (ts_recheck_id > 0)
		return;

	ts_recheck_id = g_timeout_add_seconds(TS_RECHECK_INTERVAL, ts_recheck,
			NULL);
}

/*
 * This function must be called everytime the default service changes, the
 * service timeserver(s) or gateway changes or the global timeserver(s) changes.
 */
int __connman_timeserver_sync(struct connman_service *default_service)
{
	struct connman_service *service;

	if (default_service)
		service = default_service;
	else
		service = __connman_service_get_default();

	if (!service)
		return -EINVAL;

	if (!resolv)
		return 0;
	/*
	 * Before we start creating the new timeserver list we must stop
	 * any ongoing ntp query and server resolution.
	 */

	__connman_ntp_stop();

	ts_recheck_disable();

	if (resolv_id > 0)
		g_resolv_cancel_lookup(resolv, resolv_id);

	g_slist_free_full(ts_list, g_free);

	ts_list = __connman_timeserver_get_all(service);

	__connman_service_timeserver_changed(service, ts_list);

	if (!ts_list) {
		DBG("No timeservers set.");
		return 0;
	}

	ts_recheck_enable();

	__connman_timeserver_sync_next();

	return 0;
}

static int timeserver_start(struct connman_service *service)
{
	char **nameservers;
	int i;

	DBG("service %p", service);

	i = __connman_service_get_index(service);
	if (i < 0)
		return -EINVAL;

	nameservers = connman_service_get_nameservers(service);
	if (!nameservers)
		return -EINVAL;

	/* Stop an already ongoing resolution, if there is one */
	if (resolv && resolv_id > 0)
		g_resolv_cancel_lookup(resolv, resolv_id);

	/* get rid of the old resolver */
	if (resolv) {
		g_resolv_unref(resolv);
		resolv = NULL;
	}

	resolv = g_resolv_new(i);
	if (!resolv) {
		g_strfreev(nameservers);
		return -ENOMEM;
	}

	if (getenv("CONNMAN_RESOLV_DEBUG"))
		g_resolv_set_debug(resolv, resolv_debug, "RESOLV");

	for (i = 0; nameservers[i]; i++)
		g_resolv_add_nameserver(resolv, nameservers[i], 53, 0);

	g_strfreev(nameservers);

	return __connman_timeserver_sync(service);
}

static void timeserver_stop(void)
{
	DBG(" ");

	if (resolv) {
		g_resolv_unref(resolv);
		resolv = NULL;
	}

	g_slist_free_full(ts_list, g_free);

	ts_list = NULL;

	__connman_ntp_stop();

	ts_recheck_disable();
}

int __connman_timeserver_system_set(char **servers)
{
	save_timeservers(servers);

	__connman_timeserver_sync(NULL);

	return 0;
}

char **__connman_timeserver_system_get()
{
	char **servers;

	servers = load_timeservers();
	return servers;
}

static void default_changed(struct connman_service *default_service)
{
	if (default_service)
		timeserver_start(default_service);
	else
		timeserver_stop();
}

static struct connman_notifier timeserver_notifier = {
	.name			= "timeserver",
	.default_changed	= default_changed,
};

int __connman_timeserver_init(void)
{
	DBG("");

	connman_notifier_register(&timeserver_notifier);

	return 0;
}

void __connman_timeserver_cleanup(void)
{
	DBG("");

	connman_notifier_unregister(&timeserver_notifier);
}