src/timeserver.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2010  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 /*
 160  * __connman_timeserver_get_all function creates the timeserver
 161  * list which will be used to determine NTP server for time corrections.
 162  * The service settings take priority over the global timeservers.
 163  */
 164 GSList *__connman_timeserver_get_all(struct connman_service *service)
 165 {
 166         GSList *list = NULL;
 167         struct connman_network *network;
 168         char **timeservers;
 169         char **service_ts;
 170         char **service_ts_config;
 171         const char *service_gw;
 172         char **fallback_ts;
 173         int index, i;
 174
 175         service_ts_config = connman_service_get_timeservers_config(service);
 176
 177         /* First add Service Timeservers.Configuration to the list */
 178         for (i = 0; service_ts_config != NULL && service_ts_config[i] != NULL;
 179                         i++)
 180                 list = g_slist_prepend(list, g_strdup(service_ts_config[i]));
 181
 182         service_ts = connman_service_get_timeservers(service);
 183
 184         /* First add Service Timeservers via DHCP to the list */
 185         for (i = 0; service_ts != NULL && service_ts[i] != NULL; i++)
 186                 list = g_slist_prepend(list, g_strdup(service_ts[i]));
 187
 188         network = __connman_service_get_network(service);
 189
 190         index = connman_network_get_index(network);
 191
 192         service_gw = __connman_ipconfig_get_gateway_from_index(index);
 193
 194         /* Then add Service Gateway to the list */
 195         if (service_gw != NULL)
 196                 list = g_slist_prepend(list, g_strdup(service_gw));
 197
 198         /* Then add Global Timeservers to the list */
 199         timeservers = load_timeservers();
 200
 201         for (i = 0; timeservers != NULL && timeservers[i] != NULL; i++)
 202                 list = g_slist_prepend(list, g_strdup(timeservers[i]));
 203
 204         g_strfreev(timeservers);
 205
 206         fallback_ts = connman_setting_get_string_list("FallbackTimeservers");
 207
 208         /* Lastly add the fallback servers */
 209         for (i = 0; fallback_ts != NULL && fallback_ts[i] != NULL; i++)
 210                 list = g_slist_prepend(list, g_strdup(fallback_ts[i]));
 211
 212         return g_slist_reverse(list);
 213 }
 214
 215 /*
 216  * This function must be called everytime the default service changes, the
 217  * service timeserver(s) or gatway changes or the global timeserver(s) changes.
 218  */
 219 int __connman_timeserver_sync(struct connman_service *default_service)
 220 {
 221         struct connman_service *service;
 222
 223         if (default_service != NULL)
 224                 service = default_service;
 225         else
 226                 service = __connman_service_get_default();
 227
 228         if (service == NULL)
 229                 return -EINVAL;
 230
 231         if (resolv == NULL)
 232                 return 0;
 233         /*
 234          * Before we start creating the new timeserver list we must stop
 235          * any ongoing ntp query and server resolution.
 236          */
 237
 238         __connman_ntp_stop();
 239
 240         if (resolv_id > 0)
 241                 g_resolv_cancel_lookup(resolv, resolv_id);
 242
 243         g_slist_free_full(ts_list, g_free);
 244
 245         ts_list = __connman_timeserver_get_all(service);
 246
 247         __connman_service_timeserver_changed(service, ts_list);
 248
 249         if (ts_list == NULL) {
 250                 DBG("No timeservers set.");
 251                 return 0;
 252         }
 253
 254         __connman_timeserver_sync_next();
 255
 256         return 0;
 257 }
 258
 259 static int timeserver_start(struct connman_service *service)
 260 {
 261         char **nameservers;
 262         int i;
 263
 264         DBG("service %p", service);
 265
 266         i = __connman_service_get_index(service);
 267         if (i < 0)
 268                 return -EINVAL;
 269
 270         nameservers = connman_service_get_nameservers(service);
 271         if (nameservers == NULL)
 272                 return -EINVAL;
 273
 274         /* Stop an already ongoing resolution, if there is one */
 275         if (resolv != NULL && resolv_id > 0)
 276                 g_resolv_cancel_lookup(resolv, resolv_id);
 277
 278         /* get rid of the old resolver */
 279         if (resolv != NULL) {
 280                 g_resolv_unref(resolv);
 281                 resolv = NULL;
 282         }
 283
 284         resolv = g_resolv_new(i);
 285         if (resolv == NULL) {
 286                 g_strfreev(nameservers);
 287                 return -ENOMEM;
 288         }
 289
 290         if (getenv("CONNMAN_RESOLV_DEBUG"))
 291                 g_resolv_set_debug(resolv, resolv_debug, "RESOLV");
 292
 293         for (i = 0; nameservers[i] != NULL; i++)
 294                 g_resolv_add_nameserver(resolv, nameservers[i], 53, 0);
 295
 296         g_strfreev(nameservers);
 297
 298         return __connman_timeserver_sync(service);
 299 }
 300
 301 static void timeserver_stop()
 302 {
 303         DBG(" ");
 304
 305         if (resolv != NULL) {
 306                 g_resolv_unref(resolv);
 307                 resolv = NULL;
 308         }
 309
 310         g_slist_free_full(ts_list, g_free);
 311
 312         ts_list = NULL;
 313
 314         __connman_ntp_stop();
 315 }
 316
 317 int __connman_timeserver_system_set(char **servers)
 318 {
 319         save_timeservers(servers);
 320
 321         __connman_timeserver_sync(NULL);
 322
 323         return 0;
 324 }
 325
 326 char **__connman_timeserver_system_get()
 327 {
 328         char **servers;
 329
 330         servers = load_timeservers();
 331         return servers;
 332 }
 333
 334 static void default_changed(struct connman_service *default_service)
 335 {
 336         if (default_service != NULL)
 337                 timeserver_start(default_service);
 338         else
 339                 timeserver_stop();
 340 }
 341
 342 static struct connman_notifier timeserver_notifier = {
 343         .name                   = "timeserver",
 344         .default_changed        = default_changed,
 345 };
 346
 347 int __connman_timeserver_init(void)
 348 {
 349         DBG("");
 350
 351         connman_notifier_register(&timeserver_notifier);
 352
 353         return 0;
 354 }
 355
 356 void __connman_timeserver_cleanup(void)
 357 {
 358         DBG("");
 359
 360         connman_notifier_unregister(&timeserver_notifier);
 361 }