src/timeserver.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2012  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 static GSList *ts_list = NULL;
  36
  37 static GResolv *resolv = NULL;
  38 static int resolv_id = 0;
  39
  40 static void resolv_debug(const char *str, void *data)
  41 {
  42         connman_info("%s: %s\n", (const char *) data, str);
  43 }
  44 static void save_timeservers(char **servers)
  45 {
  46         GKeyFile *keyfile;
  47         int cnt;
  48
  49         keyfile = __connman_storage_load_global();
  50         if (keyfile == NULL)
  51                 keyfile = g_key_file_new();
  52
  53         for (cnt = 0; servers != NULL && servers[cnt] != NULL; cnt++);
  54
  55         g_key_file_set_string_list(keyfile, "global", "Timeservers",
  56                            (const gchar **)servers, cnt);
  57
  58         __connman_storage_save_global(keyfile);
  59
  60         g_key_file_free(keyfile);
  61
  62         return;
  63 }
  64
  65 static char **load_timeservers()
  66 {
  67         GKeyFile *keyfile;
  68         GError *error = NULL;
  69         char **servers = NULL;
  70
  71         keyfile = __connman_storage_load_global();
  72         if (keyfile == NULL)
  73                 return NULL;
  74
  75         servers = g_key_file_get_string_list(keyfile, "global",
  76                                                 "Timeservers", NULL, &error);
  77         if (error) {
  78                 DBG("Error loading timeservers: %s", error->message);
  79                 g_error_free(error);
  80         }
  81
  82         g_key_file_free(keyfile);
  83
  84         return servers;
  85 }
  86
  87 static void resolv_result(GResolvResultStatus status, char **results, gpointer user_data)
  88 {
  89         int i;
  90
  91         DBG("status %d", status);
  92
  93         if (status == G_RESOLV_RESULT_STATUS_SUCCESS) {
  94                 if (results != NULL) {
  95                         for (i = 0; results[i]; i++)
  96                                 DBG("result: %s", results[i]);
  97
  98                         __connman_ntp_start(results[0]);
  99
 100                         return;
 101                 }
 102         }
 103
 104         /* If resolving fails, move to the next server */
 105         __connman_timeserver_sync_next();
 106 }
 107
 108 /*
 109  * Once the timeserver list (ts_list) is created, we start querying the
 110  * servers one by one. If resolving fails on one of them, we move to the
 111  * next one. The user can enter either an IP address or a URL for the
 112  * timeserver. We only resolve the urls. Once we have a IP for the NTP
 113  * server, we start querying it for time corrections.
 114  */
 115 void __connman_timeserver_sync_next()
 116 {
 117         char *server;
 118         int ret;
 119         struct addrinfo hints;
 120         struct addrinfo *addr;
 121
 122         __connman_ntp_stop();
 123
 124         /* Get the 1st server in the list */
 125         if (ts_list == NULL)
 126                 return;
 127
 128         server = ts_list->data;
 129
 130         ts_list = g_slist_delete_link(ts_list, ts_list);
 131
 132         memset(&hints, 0, sizeof(struct addrinfo));
 133         hints.ai_flags = AI_NUMERICHOST;
 134         addr = NULL;
 135
 136         ret = getaddrinfo(server, NULL, &hints, &addr);
 137         freeaddrinfo(addr);
 138
 139         /* if its a IP , directly query it. */
 140         if (ret == 0) {
 141                 DBG("Using timeservers %s", server);
 142
 143                 __connman_ntp_start(server);
 144
 145                 g_free(server);
 146                 return;
 147         }
 148
 149         DBG("Resolving server %s", server);
 150
 151         resolv_id = g_resolv_lookup_hostname(resolv, server,
 152                                                 resolv_result, NULL);
 153
 154         g_free(server);
 155
 156         return;
 157 }
 158
 159 GSList *__connman_timeserver_add_list(GSList *server_list,
 160                 const char *timeserver)
 161 {
 162         GSList *list = server_list;
 163
 164         if (timeserver == NULL)
 165                 return server_list;
 166
 167         while (list != NULL) {
 168                 char *existing_server = list->data;
 169                 if (strcmp(timeserver, existing_server) == 0)
 170                         return server_list;
 171                 list = g_slist_next(list);
 172         }
 173         return g_slist_prepend(server_list, g_strdup(timeserver));
 174 }
 175
 176 /*
 177  * __connman_timeserver_get_all function creates the timeserver
 178  * list which will be used to determine NTP server for time corrections.
 179  * The service settings take priority over the global timeservers.
 180  */
 181 GSList *__connman_timeserver_get_all(struct connman_service *service)
 182 {
 183         GSList *list = NULL;
 184         struct connman_network *network;
 185         char **timeservers;
 186         char **service_ts;
 187         char **service_ts_config;
 188         const char *service_gw;
 189         char **fallback_ts;
 190         int index, i;
 191
 192         service_ts_config = connman_service_get_timeservers_config(service);
 193
 194         /* First add Service Timeservers.Configuration to the list */
 195         for (i = 0; service_ts_config != NULL && service_ts_config[i] != NULL;
 196                         i++)
 197                 list = __connman_timeserver_add_list(list,
 198                                 service_ts_config[i]);
 199
 200         service_ts = connman_service_get_timeservers(service);
 201
 202         /* First add Service Timeservers via DHCP to the list */
 203         for (i = 0; service_ts != NULL && service_ts[i] != NULL; i++)
 204                 list = __connman_timeserver_add_list(list, service_ts[i]);
 205
 206         network = __connman_service_get_network(service);
 207         if (network != NULL) {
 208                 index = connman_network_get_index(network);
 209                 service_gw = __connman_ipconfig_get_gateway_from_index(index,
 210                         CONNMAN_IPCONFIG_TYPE_ALL);
 211
 212                 /* Then add Service Gateway to the list */
 213                 if (service_gw != NULL)
 214                         list = __connman_timeserver_add_list(list, service_gw);
 215         }
 216
 217         /* Then add Global Timeservers to the list */
 218         timeservers = load_timeservers();
 219
 220         for (i = 0; timeservers != NULL && timeservers[i] != NULL; i++)
 221                 list = __connman_timeserver_add_list(list, timeservers[i]);
 222
 223         g_strfreev(timeservers);
 224
 225         fallback_ts = connman_setting_get_string_list("FallbackTimeservers");
 226
 227         /* Lastly add the fallback servers */
 228         for (i = 0; fallback_ts != NULL && fallback_ts[i] != NULL; i++)
 229                 list = __connman_timeserver_add_list(list, fallback_ts[i]);
 230
 231         return g_slist_reverse(list);
 232 }
 233
 234 /*
 235  * This function must be called everytime the default service changes, the
 236  * service timeserver(s) or gatway changes or the global timeserver(s) changes.
 237  */
 238 int __connman_timeserver_sync(struct connman_service *default_service)
 239 {
 240         struct connman_service *service;
 241
 242         if (default_service != NULL)
 243                 service = default_service;
 244         else
 245                 service = __connman_service_get_default();
 246
 247         if (service == NULL)
 248                 return -EINVAL;
 249
 250         if (resolv == NULL)
 251                 return 0;
 252         /*
 253          * Before we start creating the new timeserver list we must stop
 254          * any ongoing ntp query and server resolution.
 255          */
 256
 257         __connman_ntp_stop();
 258
 259         if (resolv_id > 0)
 260                 g_resolv_cancel_lookup(resolv, resolv_id);
 261
 262         g_slist_free_full(ts_list, g_free);
 263
 264         ts_list = __connman_timeserver_get_all(service);
 265
 266         __connman_service_timeserver_changed(service, ts_list);
 267
 268         if (ts_list == NULL) {
 269                 DBG("No timeservers set.");
 270                 return 0;
 271         }
 272
 273         __connman_timeserver_sync_next();
 274
 275         return 0;
 276 }
 277
 278 static int timeserver_start(struct connman_service *service)
 279 {
 280         char **nameservers;
 281         int i;
 282
 283         DBG("service %p", service);
 284
 285         i = __connman_service_get_index(service);
 286         if (i < 0)
 287                 return -EINVAL;
 288
 289         nameservers = connman_service_get_nameservers(service);
 290         if (nameservers == NULL)
 291                 return -EINVAL;
 292
 293         /* Stop an already ongoing resolution, if there is one */
 294         if (resolv != NULL && resolv_id > 0)
 295                 g_resolv_cancel_lookup(resolv, resolv_id);
 296
 297         /* get rid of the old resolver */
 298         if (resolv != NULL) {
 299                 g_resolv_unref(resolv);
 300                 resolv = NULL;
 301         }
 302
 303         resolv = g_resolv_new(i);
 304         if (resolv == NULL) {
 305                 g_strfreev(nameservers);
 306                 return -ENOMEM;
 307         }
 308
 309         if (getenv("CONNMAN_RESOLV_DEBUG"))
 310                 g_resolv_set_debug(resolv, resolv_debug, "RESOLV");
 311
 312         for (i = 0; nameservers[i] != NULL; i++)
 313                 g_resolv_add_nameserver(resolv, nameservers[i], 53, 0);
 314
 315         g_strfreev(nameservers);
 316
 317         return __connman_timeserver_sync(service);
 318 }
 319
 320 static void timeserver_stop()
 321 {
 322         DBG(" ");
 323
 324         if (resolv != NULL) {
 325                 g_resolv_unref(resolv);
 326                 resolv = NULL;
 327         }
 328
 329         g_slist_free_full(ts_list, g_free);
 330
 331         ts_list = NULL;
 332
 333         __connman_ntp_stop();
 334 }
 335
 336 int __connman_timeserver_system_set(char **servers)
 337 {
 338         save_timeservers(servers);
 339
 340         __connman_timeserver_sync(NULL);
 341
 342         return 0;
 343 }
 344
 345 char **__connman_timeserver_system_get()
 346 {
 347         char **servers;
 348
 349         servers = load_timeservers();
 350         return servers;
 351 }
 352
 353 static void default_changed(struct connman_service *default_service)
 354 {
 355         if (default_service != NULL)
 356                 timeserver_start(default_service);
 357         else
 358                 timeserver_stop();
 359 }
 360
 361 static struct connman_notifier timeserver_notifier = {
 362         .name                   = "timeserver",
 363         .default_changed        = default_changed,
 364 };
 365
 366 int __connman_timeserver_init(void)
 367 {
 368         DBG("");
 369
 370         connman_notifier_register(&timeserver_notifier);
 371
 372         return 0;
 373 }
 374
 375 void __connman_timeserver_cleanup(void)
 376 {
 377         DBG("");
 378
 379         connman_notifier_unregister(&timeserver_notifier);
 380 }