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 /*
 161  * __connman_timeserver_sync function recreates the timeserver
 162  * list which will be used to determine NTP server for time corrections.
 163  * It must be called everytime the default service changes, the service
 164  * timeserver(s) changes or the global timeserver(s) changes.The service
 165  * settings take priority over the global timeservers.
 166  */
 167 int __connman_timeserver_sync(struct connman_service *default_service)
 168 {
 169         struct connman_service *service;
 170         char **timeservers;
 171         char **service_ts;
 172         int i;
 173
 174         if (default_service != NULL)
 175                 service = default_service;
 176         else
 177                 service = __connman_service_get_default();
 178
 179         if (service == NULL)
 180                 return -EINVAL;
 181
 182         if (resolv == NULL)
 183                 return 0;
 184         /*
 185          * Before be start creating the new timeserver list we must stop
 186          * any ongoing ntp query and server resolution.
 187          */
 188
 189         __connman_ntp_stop();
 190
 191         if (resolv_id > 0)
 192                 g_resolv_cancel_lookup(resolv, resolv_id);
 193
 194         if (ts_list != NULL) {
 195                 g_slist_free_full(ts_list, g_free);
 196                 ts_list = NULL;
 197         }
 198
 199         service_ts = connman_service_get_timeservers(service);
 200
 201         for (i=0; service_ts != NULL && service_ts[i] != NULL; i++)
 202                 ts_list = g_slist_prepend(ts_list, g_strdup(service_ts[i]));
 203
 204         timeservers = load_timeservers();
 205
 206         for (i=0; timeservers != NULL && timeservers[i] != NULL; i++)
 207                 ts_list = g_slist_prepend(ts_list, g_strdup(timeservers[i]));
 208
 209         if (ts_list == NULL) {
 210                 DBG("No timeservers set.");
 211                 return 0;
 212         }
 213
 214         ts_list = g_slist_reverse(ts_list);
 215
 216         __connman_timeserver_sync_next();
 217
 218         return 0;
 219 }
 220
 221 static int timeserver_start(struct connman_service *service)
 222 {
 223         char **nameservers;
 224         int i;
 225
 226         DBG("service %p", service);
 227
 228         i = __connman_service_get_index(service);
 229         if (i < 0)
 230                 return -EINVAL;
 231
 232         nameservers = connman_service_get_nameservers(service);
 233         if (nameservers == NULL)
 234                 return -EINVAL;
 235
 236         /* Stop an already ongoing resolution, if there is one */
 237         if (resolv_id > 0)
 238                 g_resolv_cancel_lookup(resolv, resolv_id);
 239
 240         /* get rid of the old resolver */
 241         if (resolv != NULL) {
 242                 g_resolv_unref(resolv);
 243                 resolv = NULL;
 244         }
 245
 246         resolv = g_resolv_new(i);
 247         if (resolv == NULL)
 248                 return -ENOMEM;
 249
 250         if (getenv("CONNMAN_RESOLV_DEBUG"))
 251                 g_resolv_set_debug(resolv, resolv_debug, "RESOLV");
 252
 253         for (i = 0; nameservers[i] != NULL; i++)
 254                 g_resolv_add_nameserver(resolv, nameservers[i], 53, 0);
 255
 256         return __connman_timeserver_sync(service);
 257 }
 258
 259 static void timeserver_stop()
 260 {
 261         DBG(" ");
 262
 263         if (resolv != NULL) {
 264                 g_resolv_unref(resolv);
 265                 resolv = NULL;
 266         }
 267
 268         if (ts_list != NULL)
 269                 g_slist_free_full(ts_list, g_free);
 270
 271         ts_list = NULL;
 272
 273         __connman_ntp_stop();
 274 }
 275
 276 int __connman_timeserver_system_set(char **servers)
 277 {
 278         save_timeservers(servers);
 279
 280         __connman_timeserver_sync(NULL);
 281
 282         return 0;
 283 }
 284
 285 char **__connman_timeserver_system_get()
 286 {
 287         char **servers;
 288
 289         servers = load_timeservers();
 290         return servers;
 291 }
 292
 293 static void default_changed(struct connman_service *default_service)
 294 {
 295         if (default_service != NULL)
 296                 timeserver_start(default_service);
 297         else
 298                 timeserver_stop();
 299 }
 300
 301 static struct connman_notifier timeserver_notifier = {
 302         .name                   = "timeserver",
 303         .default_changed        = default_changed,
 304 };
 305
 306 int __connman_timeserver_init(void)
 307 {
 308         DBG("");
 309
 310         connman_notifier_register(&timeserver_notifier);
 311
 312         return 0;
 313 }
 314
 315 void __connman_timeserver_cleanup(void)
 316 {
 317         DBG("");
 318
 319         connman_notifier_unregister(&timeserver_notifier);
 320 }