src/timeserver.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2013  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <errno.h>
  27
  28 #include <glib.h>
  29 #include <stdlib.h>
  30 #include <gweb/gresolv.h>
  31 #include <netdb.h>
  32 #include <sys/time.h>
  33
  34 #include "connman.h"
  35
  36 #define TS_RECHECK_INTERVAL     7200
  37
  38 static struct connman_service *ts_service;
  39 static GSList *timeservers_list = NULL;
  40 static GSList *ts_list = NULL;
  41 static char *ts_current = NULL;
  42 static int ts_recheck_id = 0;
  43 static int ts_backoff_id = 0;
  44 static bool ts_is_synced = false;
  45
  46 static GResolv *resolv = NULL;
  47 static int resolv_id = 0;
  48
  49 static void sync_next(void);
  50
  51 static void resolv_debug(const char *str, void *data)
  52 {
  53         connman_info("%s: %s\n", (const char *) data, str);
  54 }
  55
  56 static void ntp_callback(bool success, void *user_data)
  57 {
  58         dbus_uint64_t timestamp;
  59         struct timeval tv;
  60
  61         DBG("success %d", success);
  62
  63         __connman_timeserver_set_synced(success);
  64         if (!success) {
  65                 sync_next();
  66                 return;
  67         }
  68
  69         if (gettimeofday(&tv, NULL) < 0) {
  70                 connman_warn("Failed to get current time");
  71         }
  72
  73         timestamp = tv.tv_sec;
  74         connman_dbus_property_changed_basic(
  75                                         CONNMAN_MANAGER_PATH,
  76                                         CONNMAN_CLOCK_INTERFACE, "Time",
  77                                         DBUS_TYPE_UINT64, &timestamp);
  78 }
  79
  80 static void save_timeservers(char **servers)
  81 {
  82         GKeyFile *keyfile;
  83         int cnt;
  84
  85         keyfile = __connman_storage_load_global();
  86         if (!keyfile)
  87                 keyfile = g_key_file_new();
  88
  89         for (cnt = 0; servers && servers[cnt]; cnt++);
  90
  91         g_key_file_set_string_list(keyfile, "global", "Timeservers",
  92                            (const gchar **)servers, cnt);
  93
  94         __connman_storage_save_global(keyfile);
  95
  96         g_key_file_free(keyfile);
  97 }
  98
  99 static char **load_timeservers(void)
 100 {
 101         GKeyFile *keyfile;
 102         char **servers = NULL;
 103
 104         keyfile = __connman_storage_load_global();
 105         if (!keyfile)
 106                 return NULL;
 107
 108         servers = g_key_file_get_string_list(keyfile, "global",
 109                                                 "Timeservers", NULL, NULL);
 110
 111         g_key_file_free(keyfile);
 112
 113         return servers;
 114 }
 115
 116 static void resolv_result(GResolvResultStatus status, char **results,
 117                                 gpointer user_data)
 118 {
 119         int i;
 120
 121 #if defined TIZEN_EXT
 122         gchar *server = NULL;
 123
 124         server = g_strdup((gchar *)user_data);
 125         ts_list = g_slist_append(ts_list, server);
 126
 127         if (!simplified_log)
 128                 DBG("added server %s", server);
 129
 130         if (!simplified_log)
 131 #endif
 132         DBG("status %d", status);
 133
 134         if (status == G_RESOLV_RESULT_STATUS_SUCCESS) {
 135                 if (results) {
 136                         /* prepend the results in reverse order */
 137
 138                         for (i = 0; results[i]; i++)
 139                                 /* count */;
 140                         i--;
 141
 142                         for (; i >= 0; i--) {
 143                                 DBG("result[%d]: %s", i, results[i]);
 144
 145                                 ts_list = __connman_timeserver_add_list(
 146                                         ts_list, results[i]);
 147                         }
 148                 }
 149         }
 150
 151         sync_next();
 152 }
 153
 154 /*
 155  * Once the timeserver list (timeserver_list) is created, we start
 156  * querying the servers one by one. If resolving fails on one of them,
 157  * we move to the next one. The user can enter either an IP address or
 158  * a URL for the timeserver. We only resolve the URLs. Once we have an
 159  * IP for the NTP server, we start querying it for time corrections.
 160  */
 161 static void timeserver_sync_start(void)
 162 {
 163         GSList *list;
 164
 165         for (list = timeservers_list; list; list = list->next) {
 166                 char *timeserver = list->data;
 167
 168                 ts_list = g_slist_prepend(ts_list, g_strdup(timeserver));
 169         }
 170         ts_list = g_slist_reverse(ts_list);
 171
 172         sync_next();
 173 }
 174
 175 static gboolean timeserver_sync_restart(gpointer user_data)
 176 {
 177         timeserver_sync_start();
 178         ts_backoff_id = 0;
 179
 180         return FALSE;
 181 }
 182
 183 /*
 184  * Select the next time server from the working list (ts_list) because
 185  * for some reason the first time server in the list didn't work. If
 186  * none of the server did work we start over with the first server
 187  * with a backoff.
 188  */
 189 static void sync_next(void)
 190 {
 191         if (ts_current) {
 192                 g_free(ts_current);
 193                 ts_current = NULL;
 194         }
 195
 196         __connman_ntp_stop();
 197
 198         while (ts_list) {
 199                 ts_current = ts_list->data;
 200                 ts_list = g_slist_delete_link(ts_list, ts_list);
 201
 202                 /* if it's an IP, directly query it. */
 203                 if (connman_inet_check_ipaddress(ts_current) > 0) {
 204                         DBG("Using timeserver %s", ts_current);
 205                         __connman_ntp_start(ts_current, ntp_callback, NULL);
 206                         return;
 207                 }
 208 #if defined TIZEN_EXT
 209         if (!simplified_log)
 210 #endif
 211                 DBG("Resolving timeserver %s", ts_current);
 212 #if defined TIZEN_EXT
 213                 resolv_id = g_resolv_lookup_hostname(resolv, ts_current,
 214                                                 resolv_result, ts_current);
 215 #else
 216                 resolv_id = g_resolv_lookup_hostname(resolv, ts_current,
 217                                                 resolv_result, NULL);
 218 #endif
 219                 return;
 220         }
 221
 222         DBG("No timeserver could be used, restart probing in 5 seconds");
 223         ts_backoff_id = g_timeout_add_seconds(5, timeserver_sync_restart, NULL);
 224 }
 225
 226 GSList *__connman_timeserver_add_list(GSList *server_list,
 227                 const char *timeserver)
 228 {
 229         GSList *list = server_list;
 230
 231         if (!timeserver)
 232                 return server_list;
 233
 234         while (list) {
 235                 char *existing_server = list->data;
 236                 if (strcmp(timeserver, existing_server) == 0)
 237                         return server_list;
 238                 list = g_slist_next(list);
 239         }
 240         return g_slist_prepend(server_list, g_strdup(timeserver));
 241 }
 242
 243 /*
 244  * __connman_timeserver_get_all function creates the timeserver
 245  * list which will be used to determine NTP server for time corrections.
 246  * The service settings take priority over the global timeservers.
 247  */
 248 GSList *__connman_timeserver_get_all(struct connman_service *service)
 249 {
 250         GSList *list = NULL;
 251         struct connman_network *network;
 252         char **timeservers;
 253         char **service_ts;
 254         char **service_ts_config;
 255         const char *service_gw;
 256         char **fallback_ts;
 257         int index, i;
 258
 259         if (__connman_clock_timeupdates() == TIME_UPDATES_MANUAL)
 260                 return NULL;
 261
 262         service_ts_config = connman_service_get_timeservers_config(service);
 263
 264         /* First add Service Timeservers.Configuration to the list */
 265         for (i = 0; service_ts_config && service_ts_config[i];
 266                         i++)
 267                 list = __connman_timeserver_add_list(list,
 268                                 service_ts_config[i]);
 269
 270         service_ts = connman_service_get_timeservers(service);
 271
 272         /* Then add Service Timeservers via DHCP to the list */
 273         for (i = 0; service_ts && service_ts[i]; i++)
 274                 list = __connman_timeserver_add_list(list, service_ts[i]);
 275
 276         /*
 277          * Then add Service Gateway to the list, if UseGatewaysAsTimeservers
 278          * configuration option is set to true.
 279          */
 280         if (connman_setting_get_bool("UseGatewaysAsTimeservers")) {
 281                 network = __connman_service_get_network(service);
 282                 if (network) {
 283                         index = connman_network_get_index(network);
 284                         service_gw = __connman_ipconfig_get_gateway_from_index(index,
 285                                 CONNMAN_IPCONFIG_TYPE_ALL);
 286
 287                         if (service_gw)
 288                                 list = __connman_timeserver_add_list(list, service_gw);
 289                 }
 290         }
 291
 292         /* Then add Global Timeservers to the list */
 293         timeservers = load_timeservers();
 294
 295         for (i = 0; timeservers && timeservers[i]; i++)
 296                 list = __connman_timeserver_add_list(list, timeservers[i]);
 297
 298         g_strfreev(timeservers);
 299
 300         fallback_ts = connman_setting_get_string_list("FallbackTimeservers");
 301
 302         /* Lastly add the fallback servers */
 303         for (i = 0; fallback_ts && fallback_ts[i]; i++)
 304                 list = __connman_timeserver_add_list(list, fallback_ts[i]);
 305
 306         return g_slist_reverse(list);
 307 }
 308
 309 static gboolean ts_recheck(gpointer user_data)
 310 {
 311         struct connman_service *service;
 312         GSList *ts;
 313
 314         ts = __connman_timeserver_get_all(connman_service_get_default());
 315
 316         if (!ts) {
 317                 DBG("timeservers disabled");
 318
 319                 return TRUE;
 320         }
 321
 322         if (g_strcmp0(ts_current, ts->data) != 0) {
 323                 DBG("current %s preferred %s", ts_current, (char *)ts->data);
 324
 325                 g_slist_free_full(ts, g_free);
 326
 327                 service = connman_service_get_default();
 328                 __connman_timeserver_sync(service);
 329
 330                 return FALSE;
 331         }
 332
 333         DBG("");
 334
 335         g_slist_free_full(ts, g_free);
 336
 337         return TRUE;
 338 }
 339
 340 static void ts_recheck_disable(void)
 341 {
 342         if (ts_recheck_id == 0)
 343                 return;
 344
 345         g_source_remove(ts_recheck_id);
 346         ts_recheck_id = 0;
 347
 348         if (ts_backoff_id) {
 349                 g_source_remove(ts_backoff_id);
 350                 ts_backoff_id = 0;
 351         }
 352
 353         if (ts_current) {
 354                 g_free(ts_current);
 355                 ts_current = NULL;
 356         }
 357 }
 358
 359 static void ts_recheck_enable(void)
 360 {
 361         if (ts_recheck_id > 0)
 362                 return;
 363
 364         ts_recheck_id = g_timeout_add_seconds(TS_RECHECK_INTERVAL, ts_recheck,
 365                         NULL);
 366 }
 367
 368 static void ts_reset(struct connman_service *service)
 369 {
 370         char **nameservers;
 371         int i;
 372
 373         if (!resolv)
 374                 return;
 375
 376         __connman_timeserver_set_synced(false);
 377
 378         /*
 379          * Before we start creating the new timeserver list we must stop
 380          * any ongoing ntp query and server resolution.
 381          */
 382
 383         __connman_ntp_stop();
 384
 385         ts_recheck_disable();
 386
 387         if (resolv_id > 0)
 388                 g_resolv_cancel_lookup(resolv, resolv_id);
 389
 390         g_resolv_flush_nameservers(resolv);
 391
 392         nameservers = connman_service_get_nameservers(service);
 393         if (nameservers) {
 394                 for (i = 0; nameservers[i]; i++)
 395                         g_resolv_add_nameserver(resolv, nameservers[i], 53, 0);
 396
 397                 g_strfreev(nameservers);
 398         }
 399
 400         g_slist_free_full(timeservers_list, g_free);
 401
 402         timeservers_list = __connman_timeserver_get_all(service);
 403
 404         __connman_service_timeserver_changed(service, timeservers_list);
 405
 406         if (!timeservers_list) {
 407                 DBG("No timeservers set.");
 408                 return;
 409         }
 410
 411         ts_recheck_enable();
 412
 413         ts_service = service;
 414         timeserver_sync_start();
 415 }
 416
 417 void __connman_timeserver_sync(struct connman_service *service)
 418 {
 419         if (!service || ts_service == service)
 420                 return;
 421
 422         ts_reset(service);
 423 }
 424
 425 void __connman_timeserver_conf_update(struct connman_service *service)
 426 {
 427         if (!service || (ts_service && ts_service != service))
 428                 return;
 429
 430         ts_reset(service);
 431 }
 432
 433
 434 bool __connman_timeserver_is_synced(void)
 435 {
 436         return ts_is_synced;
 437 }
 438
 439 void __connman_timeserver_set_synced(bool status)
 440 {
 441         dbus_bool_t is_synced;
 442
 443         if (ts_is_synced == status)
 444                 return;
 445
 446         ts_is_synced = status;
 447         is_synced = status;
 448         connman_dbus_property_changed_basic(CONNMAN_MANAGER_PATH,
 449                                 CONNMAN_CLOCK_INTERFACE, "TimeserverSynced",
 450                                 DBUS_TYPE_BOOLEAN, &is_synced);
 451 }
 452
 453 static int timeserver_start(struct connman_service *service)
 454 {
 455         char **nameservers;
 456         int i;
 457
 458         DBG("service %p", service);
 459
 460         i = __connman_service_get_index(service);
 461         if (i < 0)
 462                 return -EINVAL;
 463
 464         nameservers = connman_service_get_nameservers(service);
 465
 466         /* Stop an already ongoing resolution, if there is one */
 467         if (resolv && resolv_id > 0)
 468                 g_resolv_cancel_lookup(resolv, resolv_id);
 469
 470         /* get rid of the old resolver */
 471         if (resolv) {
 472                 g_resolv_unref(resolv);
 473                 resolv = NULL;
 474         }
 475
 476         resolv = g_resolv_new(i);
 477         if (!resolv) {
 478                 g_strfreev(nameservers);
 479                 return -ENOMEM;
 480         }
 481
 482         if (getenv("CONNMAN_RESOLV_DEBUG"))
 483                 g_resolv_set_debug(resolv, resolv_debug, "RESOLV");
 484
 485         if (nameservers) {
 486                 for (i = 0; nameservers[i]; i++)
 487                         g_resolv_add_nameserver(resolv, nameservers[i], 53, 0);
 488
 489                 g_strfreev(nameservers);
 490         }
 491
 492         __connman_timeserver_sync(service);
 493
 494         return 0;
 495 }
 496
 497 static void timeserver_stop(void)
 498 {
 499         DBG(" ");
 500
 501         ts_service = NULL;
 502
 503         if (resolv) {
 504                 g_resolv_unref(resolv);
 505                 resolv = NULL;
 506         }
 507
 508         g_slist_free_full(timeservers_list, g_free);
 509         timeservers_list = NULL;
 510
 511         g_slist_free_full(ts_list, g_free);
 512         ts_list = NULL;
 513
 514         __connman_ntp_stop();
 515
 516         ts_recheck_disable();
 517 }
 518
 519 int __connman_timeserver_system_set(char **servers)
 520 {
 521         struct connman_service *service;
 522
 523         save_timeservers(servers);
 524
 525         service = connman_service_get_default();
 526         if (service)
 527                 ts_reset(service);
 528
 529         return 0;
 530 }
 531
 532 char **__connman_timeserver_system_get()
 533 {
 534         char **servers;
 535
 536         servers = load_timeservers();
 537         return servers;
 538 }
 539
 540 static void default_changed(struct connman_service *default_service)
 541 {
 542         if (default_service)
 543                 timeserver_start(default_service);
 544         else
 545                 timeserver_stop();
 546 }
 547
 548 static const struct connman_notifier timeserver_notifier = {
 549         .name                   = "timeserver",
 550         .default_changed        = default_changed,
 551 };
 552
 553 int __connman_timeserver_init(void)
 554 {
 555         DBG("");
 556
 557         connman_notifier_register(&timeserver_notifier);
 558
 559         return 0;
 560 }
 561
 562 void __connman_timeserver_cleanup(void)
 563 {
 564         DBG("");
 565
 566         connman_notifier_unregister(&timeserver_notifier);
 567 }