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
  33 #include "connman.h"
  34
  35 #define TS_RECHECK_INTERVAL     7200
  36
  37 static GSList *ts_list = NULL;
  38 static char *ts_current = NULL;
  39 static int ts_recheck_id = 0;
  40
  41 static GResolv *resolv = NULL;
  42 static int resolv_id = 0;
  43
  44 static void resolv_debug(const char *str, void *data)
  45 {
  46         connman_info("%s: %s\n", (const char *) data, str);
  47 }
  48 static void save_timeservers(char **servers)
  49 {
  50         GKeyFile *keyfile;
  51         int cnt;
  52
  53         keyfile = __connman_storage_load_global();
  54         if (!keyfile)
  55                 keyfile = g_key_file_new();
  56
  57         for (cnt = 0; servers && servers[cnt]; cnt++);
  58
  59         g_key_file_set_string_list(keyfile, "global", "Timeservers",
  60                            (const gchar **)servers, cnt);
  61
  62         __connman_storage_save_global(keyfile);
  63
  64         g_key_file_free(keyfile);
  65
  66         return;
  67 }
  68
  69 static char **load_timeservers(void)
  70 {
  71         GKeyFile *keyfile;
  72         char **servers = NULL;
  73
  74         keyfile = __connman_storage_load_global();
  75         if (!keyfile)
  76                 return NULL;
  77
  78         servers = g_key_file_get_string_list(keyfile, "global",
  79                                                 "Timeservers", NULL, NULL);
  80
  81         g_key_file_free(keyfile);
  82
  83         return servers;
  84 }
  85
  86 static void resolv_result(GResolvResultStatus status, char **results,
  87                                 gpointer user_data)
  88 {
  89         int i;
  90
  91 #if defined TIZEN_EXT
  92         gchar *server = NULL;
  93
  94         server = g_strdup((gchar *)user_data);
  95         ts_list = g_slist_append(ts_list, server);
  96
  97         DBG("added server %s", server);
  98 #endif
  99
 100         DBG("status %d", status);
 101
 102         if (status == G_RESOLV_RESULT_STATUS_SUCCESS) {
 103                 if (results) {
 104                         for (i = 0; results[i]; i++) {
 105                                 DBG("result[%d]: %s", i, results[i]);
 106                                 if (i == 0)
 107                                         continue;
 108
 109                                 ts_list = __connman_timeserver_add_list(
 110                                                         ts_list, results[i]);
 111                         }
 112
 113                         DBG("Using timeserver %s", results[0]);
 114
 115                         __connman_ntp_start(results[0]);
 116
 117                         return;
 118                 }
 119         }
 120
 121         /* If resolving fails, move to the next server */
 122         __connman_timeserver_sync_next();
 123 }
 124
 125 /*
 126  * Once the timeserver list (ts_list) is created, we start querying the
 127  * servers one by one. If resolving fails on one of them, we move to the
 128  * next one. The user can enter either an IP address or a URL for the
 129  * timeserver. We only resolve the URLs. Once we have an IP for the NTP
 130  * server, we start querying it for time corrections.
 131  */
 132 void __connman_timeserver_sync_next()
 133 {
 134         if (ts_current) {
 135                 g_free(ts_current);
 136                 ts_current = NULL;
 137         }
 138
 139         __connman_ntp_stop();
 140
 141         /* Get the 1st server in the list */
 142         if (!ts_list)
 143                 return;
 144
 145         ts_current = ts_list->data;
 146
 147         ts_list = g_slist_delete_link(ts_list, ts_list);
 148
 149         /* if it's an IP, directly query it. */
 150         if (connman_inet_check_ipaddress(ts_current) > 0) {
 151                 DBG("Using timeserver %s", ts_current);
 152
 153                 __connman_ntp_start(ts_current);
 154
 155                 return;
 156         }
 157
 158         DBG("Resolving timeserver %s", ts_current);
 159
 160 #if defined TIZEN_EXT
 161         resolv_id = g_resolv_lookup_hostname(resolv, ts_current,
 162                                                 resolv_result, ts_current);
 163 #else
 164         resolv_id = g_resolv_lookup_hostname(resolv, ts_current,
 165                                                 resolv_result, NULL);
 166 #endif
 167
 168         return;
 169 }
 170
 171 GSList *__connman_timeserver_add_list(GSList *server_list,
 172                 const char *timeserver)
 173 {
 174         GSList *list = server_list;
 175
 176         if (!timeserver)
 177                 return server_list;
 178
 179         while (list) {
 180                 char *existing_server = list->data;
 181                 if (strcmp(timeserver, existing_server) == 0)
 182                         return server_list;
 183                 list = g_slist_next(list);
 184         }
 185         return g_slist_prepend(server_list, g_strdup(timeserver));
 186 }
 187
 188 /*
 189  * __connman_timeserver_get_all function creates the timeserver
 190  * list which will be used to determine NTP server for time corrections.
 191  * The service settings take priority over the global timeservers.
 192  */
 193 GSList *__connman_timeserver_get_all(struct connman_service *service)
 194 {
 195         GSList *list = NULL;
 196         struct connman_network *network;
 197         char **timeservers;
 198         char **service_ts;
 199         char **service_ts_config;
 200         const char *service_gw;
 201         char **fallback_ts;
 202         int index, i;
 203
 204         if (__connman_clock_timeupdates() == TIME_UPDATES_MANUAL)
 205                 return NULL;
 206
 207         service_ts_config = connman_service_get_timeservers_config(service);
 208
 209         /* First add Service Timeservers.Configuration to the list */
 210         for (i = 0; service_ts_config && service_ts_config[i];
 211                         i++)
 212                 list = __connman_timeserver_add_list(list,
 213                                 service_ts_config[i]);
 214
 215         service_ts = connman_service_get_timeservers(service);
 216
 217         /* Then add Service Timeservers via DHCP to the list */
 218         for (i = 0; service_ts && service_ts[i]; i++)
 219                 list = __connman_timeserver_add_list(list, service_ts[i]);
 220
 221         network = __connman_service_get_network(service);
 222         if (network) {
 223                 index = connman_network_get_index(network);
 224                 service_gw = __connman_ipconfig_get_gateway_from_index(index,
 225                         CONNMAN_IPCONFIG_TYPE_ALL);
 226
 227                 /* Then add Service Gateway to the list */
 228                 if (service_gw)
 229                         list = __connman_timeserver_add_list(list, service_gw);
 230         }
 231
 232         /* Then add Global Timeservers to the list */
 233         timeservers = load_timeservers();
 234
 235         for (i = 0; timeservers && timeservers[i]; i++)
 236                 list = __connman_timeserver_add_list(list, timeservers[i]);
 237
 238         g_strfreev(timeservers);
 239
 240         fallback_ts = connman_setting_get_string_list("FallbackTimeservers");
 241
 242         /* Lastly add the fallback servers */
 243         for (i = 0; fallback_ts && fallback_ts[i]; i++)
 244                 list = __connman_timeserver_add_list(list, fallback_ts[i]);
 245
 246         return g_slist_reverse(list);
 247 }
 248
 249 static gboolean ts_recheck(gpointer user_data)
 250 {
 251         GSList *ts;
 252
 253         ts = __connman_timeserver_get_all(__connman_service_get_default());
 254
 255         if (!ts) {
 256                 DBG("timeservers disabled");
 257
 258                 return TRUE;
 259         }
 260
 261         if (g_strcmp0(ts_current, ts->data) != 0) {
 262                 DBG("current %s preferred %s", ts_current, (char *)ts->data);
 263
 264                 g_slist_free_full(ts, g_free);
 265
 266                 __connman_timeserver_sync(NULL);
 267
 268                 return FALSE;
 269         }
 270
 271         DBG("");
 272
 273         g_slist_free_full(ts, g_free);
 274
 275         return TRUE;
 276 }
 277
 278 static void ts_recheck_disable(void)
 279 {
 280         if (ts_recheck_id == 0)
 281                 return;
 282
 283         g_source_remove(ts_recheck_id);
 284         ts_recheck_id = 0;
 285
 286         if (ts_current) {
 287                 g_free(ts_current);
 288                 ts_current = NULL;
 289         }
 290 }
 291
 292 static void ts_recheck_enable(void)
 293 {
 294         if (ts_recheck_id > 0)
 295                 return;
 296
 297         ts_recheck_id = g_timeout_add_seconds(TS_RECHECK_INTERVAL, ts_recheck,
 298                         NULL);
 299 }
 300
 301 /*
 302  * This function must be called everytime the default service changes, the
 303  * service timeserver(s) or gateway changes or the global timeserver(s) changes.
 304  */
 305 int __connman_timeserver_sync(struct connman_service *default_service)
 306 {
 307         struct connman_service *service;
 308         char **nameservers;
 309         int i;
 310
 311         if (default_service)
 312                 service = default_service;
 313         else
 314                 service = __connman_service_get_default();
 315
 316         if (!service)
 317                 return -EINVAL;
 318
 319         if (!resolv)
 320                 return 0;
 321         /*
 322          * Before we start creating the new timeserver list we must stop
 323          * any ongoing ntp query and server resolution.
 324          */
 325
 326         __connman_ntp_stop();
 327
 328         ts_recheck_disable();
 329
 330         if (resolv_id > 0)
 331                 g_resolv_cancel_lookup(resolv, resolv_id);
 332
 333         g_resolv_flush_nameservers(resolv);
 334
 335         nameservers = connman_service_get_nameservers(service);
 336         if (!nameservers)
 337                 return -EINVAL;
 338
 339         for (i = 0; nameservers[i]; i++)
 340                 g_resolv_add_nameserver(resolv, nameservers[i], 53, 0);
 341
 342         g_strfreev(nameservers);
 343
 344         g_slist_free_full(ts_list, g_free);
 345
 346         ts_list = __connman_timeserver_get_all(service);
 347
 348         __connman_service_timeserver_changed(service, ts_list);
 349
 350         if (!ts_list) {
 351                 DBG("No timeservers set.");
 352                 return 0;
 353         }
 354
 355         ts_recheck_enable();
 356
 357         __connman_timeserver_sync_next();
 358
 359         return 0;
 360 }
 361
 362 static int timeserver_start(struct connman_service *service)
 363 {
 364         char **nameservers;
 365         int i;
 366
 367         DBG("service %p", service);
 368
 369         i = __connman_service_get_index(service);
 370         if (i < 0)
 371                 return -EINVAL;
 372
 373         nameservers = connman_service_get_nameservers(service);
 374         if (!nameservers)
 375                 return -EINVAL;
 376
 377         /* Stop an already ongoing resolution, if there is one */
 378         if (resolv && resolv_id > 0)
 379                 g_resolv_cancel_lookup(resolv, resolv_id);
 380
 381         /* get rid of the old resolver */
 382         if (resolv) {
 383                 g_resolv_unref(resolv);
 384                 resolv = NULL;
 385         }
 386
 387         resolv = g_resolv_new(i);
 388         if (!resolv) {
 389                 g_strfreev(nameservers);
 390                 return -ENOMEM;
 391         }
 392
 393         if (getenv("CONNMAN_RESOLV_DEBUG"))
 394                 g_resolv_set_debug(resolv, resolv_debug, "RESOLV");
 395
 396         for (i = 0; nameservers[i]; i++)
 397                 g_resolv_add_nameserver(resolv, nameservers[i], 53, 0);
 398
 399         g_strfreev(nameservers);
 400
 401         return __connman_timeserver_sync(service);
 402 }
 403
 404 static void timeserver_stop(void)
 405 {
 406         DBG(" ");
 407
 408         if (resolv) {
 409                 g_resolv_unref(resolv);
 410                 resolv = NULL;
 411         }
 412
 413         g_slist_free_full(ts_list, g_free);
 414
 415         ts_list = NULL;
 416
 417         __connman_ntp_stop();
 418
 419         ts_recheck_disable();
 420 }
 421
 422 int __connman_timeserver_system_set(char **servers)
 423 {
 424         save_timeservers(servers);
 425
 426         __connman_timeserver_sync(NULL);
 427
 428         return 0;
 429 }
 430
 431 char **__connman_timeserver_system_get()
 432 {
 433         char **servers;
 434
 435         servers = load_timeservers();
 436         return servers;
 437 }
 438
 439 static void default_changed(struct connman_service *default_service)
 440 {
 441         if (default_service)
 442                 timeserver_start(default_service);
 443         else
 444                 timeserver_stop();
 445 }
 446
 447 static struct connman_notifier timeserver_notifier = {
 448         .name                   = "timeserver",
 449         .default_changed        = default_changed,
 450 };
 451
 452 int __connman_timeserver_init(void)
 453 {
 454         DBG("");
 455
 456         connman_notifier_register(&timeserver_notifier);
 457
 458         return 0;
 459 }
 460
 461 void __connman_timeserver_cleanup(void)
 462 {
 463         DBG("");
 464
 465         connman_notifier_unregister(&timeserver_notifier);
 466 }