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
  32 #include "connman.h"
  33
  34 static char **system_timeservers = NULL;
  35 static char **timeservers = NULL;
  36
  37 static GResolv *resolv = NULL;
  38 static int resolv_id = 0;
  39 static volatile int count;
  40
  41 static void resolv_debug(const char *str, void *data)
  42 {
  43         connman_info("%s: %s\n", (const char *) data, str);
  44 }
  45 static void save_timeservers(char **servers)
  46 {
  47         GKeyFile *keyfile;
  48         int cnt;
  49
  50         keyfile = __connman_storage_load_global();
  51         if (keyfile == NULL)
  52                 keyfile = g_key_file_new();
  53
  54         for (cnt = 0; servers != NULL && servers[cnt] != NULL; cnt++);
  55
  56         g_key_file_set_string_list(keyfile, "global", "Timeservers",
  57                            (const gchar **)servers, cnt);
  58
  59         __connman_storage_save_global(keyfile);
  60
  61         g_key_file_free(keyfile);
  62
  63         return;
  64 }
  65
  66 static char **load_timeservers()
  67 {
  68         GKeyFile *keyfile;
  69         GError *error = NULL;
  70         char **servers = NULL;
  71
  72         keyfile = __connman_storage_load_global();
  73         if (keyfile == NULL)
  74                 return NULL;
  75
  76         servers = g_key_file_get_string_list(keyfile, "global",
  77                                                 "Timeservers", NULL, &error);
  78         if (error) {
  79                 DBG("Error loading timeservers: %s", error->message);
  80                 g_error_free(error);
  81         }
  82
  83         g_key_file_free(keyfile);
  84
  85         return servers;
  86 }
  87
  88 /* Restart NTP procedure */
  89 static void connman_timeserver_restart()
  90 {
  91         /* If service timeservers are in use, dont restart ntp */
  92         if (timeservers != NULL)
  93                 return;
  94
  95         if (resolv == NULL) {
  96                 DBG("No online service.");
  97                 return;
  98         }
  99
 100         /* Cancel current lookup */
 101         if(resolv_id > 0)
 102                 g_resolv_cancel_lookup(resolv, resolv_id);
 103
 104         /* Reload system timeserver list */
 105         if (system_timeservers != NULL) {
 106                 g_strfreev(system_timeservers);
 107                 system_timeservers = NULL;
 108         }
 109
 110         system_timeservers = load_timeservers();
 111
 112         if (system_timeservers == NULL)
 113                 return;
 114
 115         __connman_ntp_stop();
 116
 117         count = 0;
 118
 119         __connman_timeserver_sync_next();
 120 }
 121
 122 static void resolv_result(GResolvResultStatus status, char **results, gpointer user_data)
 123 {
 124         int i;
 125
 126         DBG("status %d", status);
 127
 128         __sync_fetch_and_add(&count, 1);
 129
 130         if (status == G_RESOLV_RESULT_STATUS_SUCCESS) {
 131                 if (results != NULL) {
 132                         for (i = 0; results[i]; i++)
 133                                 DBG("result: %s", results[i]);
 134
 135                         __connman_ntp_start(results[0]);
 136
 137                         return;
 138                 }
 139         }
 140
 141         __connman_timeserver_sync_next();
 142 }
 143
 144 void __connman_timeserver_sync_next()
 145 {
 146         if (system_timeservers == NULL ||
 147         system_timeservers[count] == NULL)
 148                 return;
 149
 150         DBG("Trying timeserver %s", system_timeservers[count]);
 151
 152         if (resolv)
 153                 resolv_id = g_resolv_lookup_hostname(resolv,
 154                         system_timeservers[count], resolv_result,
 155                                                 NULL);
 156 }
 157
 158 int __connman_timeserver_sync(struct connman_service *default_service)
 159 {
 160         struct connman_service *service;
 161         char **nameservers;
 162         int i;
 163
 164         if (default_service != NULL)
 165                 service = default_service;
 166         else
 167                 service = __connman_service_get_default();
 168
 169         if (service == NULL)
 170                 return -EINVAL;
 171
 172         DBG("service %p", service);
 173
 174         i = __connman_service_get_index(service);
 175         if (i < 0)
 176                 return -EINVAL;
 177
 178         nameservers = connman_service_get_nameservers(service);
 179         if (nameservers == NULL)
 180                 return -EINVAL;
 181
 182         resolv = g_resolv_new(i);
 183         if (resolv == NULL)
 184                 return -ENOMEM;
 185
 186         if (getenv("CONNMAN_RESOLV_DEBUG"))
 187                 g_resolv_set_debug(resolv, resolv_debug, "RESOLV");
 188
 189         for (i = 0; nameservers[i] != NULL; i++)
 190                 g_resolv_add_nameserver(resolv, nameservers[i], 53, 0);
 191
 192         count = 0;
 193
 194         system_timeservers = load_timeservers();
 195
 196         timeservers = connman_service_get_timeservers(service);
 197
 198         if (timeservers != NULL && timeservers[0] != NULL) {
 199                 DBG("Using service tiemservers");
 200                 __connman_ntp_start(timeservers[0]);
 201                 return 0;
 202         }
 203
 204         if (system_timeservers == NULL || system_timeservers[count] == NULL) {
 205                 DBG("No timeservers set.");
 206                 return 0;
 207         }
 208
 209         DBG("Trying server %s", system_timeservers[count]);
 210
 211         resolv_id = g_resolv_lookup_hostname(resolv, system_timeservers[count],
 212                                                 resolv_result, NULL);
 213         return 0;
 214 }
 215
 216 void __connman_timeserver_stop()
 217 {
 218         DBG(" ");
 219
 220         if (resolv != NULL) {
 221                 g_resolv_unref(resolv);
 222                 resolv = NULL;
 223         }
 224
 225         if (system_timeservers != NULL) {
 226                 g_strfreev(system_timeservers);
 227                 system_timeservers = NULL;
 228         }
 229
 230         timeservers = NULL;
 231
 232         count = 0;
 233
 234         __connman_ntp_stop();
 235 }
 236
 237 int __connman_timeserver_system_set(char **servers)
 238 {
 239         save_timeservers(servers);
 240
 241         connman_timeserver_restart();
 242
 243         return 0;
 244 }
 245
 246 char **__connman_timeserver_system_get()
 247 {
 248         char **servers;
 249
 250         servers = load_timeservers();
 251         return servers;
 252 }
 253
 254 static void default_changed(struct connman_service *default_service)
 255 {
 256         DBG("");
 257
 258         if (default_service != NULL)
 259                 __connman_timeserver_sync(default_service);
 260         else
 261                 __connman_timeserver_stop();
 262 }
 263
 264 static struct connman_notifier timeserver_notifier = {
 265         .name                   = "timeserver",
 266         .default_changed        = default_changed,
 267 };
 268
 269 int __connman_timeserver_init(void)
 270 {
 271         DBG("");
 272
 273         connman_notifier_register(&timeserver_notifier);
 274
 275         return 0;
 276 }
 277
 278 void __connman_timeserver_cleanup(void)
 279 {
 280         DBG("");
 281
 282         connman_notifier_unregister(&timeserver_notifier);
 283 }