timedated.c

   1 /*
   2   Copyright 2020 Robert Nagy
   3
   4   Copyright 2012 Alexandre Rostovtsev
   5
   6   Some parts are based on the code from the systemd project; these are
   7   copyright 2011 Lennart Poettering and others.
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with this program; if not, write to the Free Software
  21   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  22 */
  23
  24 #include <errno.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <time.h>
  28
  29 #include <dbus/dbus-protocol.h>
  30 #include <glib.h>
  31 #include <glib/gstdio.h>
  32 #include <gio/gio.h>
  33
  34 #include "timedated.h"
  35 #include "timedate1-generated.h"
  36 #include "main.h"
  37 #include "rc.h"
  38 #include "utils.h"
  39
  40 #define ZONEINFO "/usr/share/zoneinfo"
  41 #define SERVICE_NAME "poetteringd timedated"
  42
  43 static guint bus_id = 0;
  44 static gboolean read_only = FALSE;
  45
  46 static PoetteringdTimedatedTimedate1 *timedate1 = NULL;
  47
  48 static GFile *localtime_file = NULL;
  49
  50 /* this is loonix only */
  51 gboolean local_rtc = FALSE;
  52
  53 gchar *timezone_name = NULL;
  54 G_LOCK_DEFINE_STATIC (clock);
  55
  56 gboolean use_ntp = FALSE;
  57 G_LOCK_DEFINE_STATIC (ntp);
  58
  59 static gchar *
  60 get_timezone_name (GError **error)
  61 {
  62         gchar *ret = NULL;
  63         gchar *localtime_filename = NULL;
  64         gchar res[PATH_MAX];
  65
  66         localtime_filename = g_file_get_path (localtime_file);
  67         if (realpath(localtime_filename, res) == NULL) {
  68                 g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
  69                     "realpath failed on %s", localtime_filename);
  70                 ret = g_strdup("");
  71                 goto out;
  72         }
  73
  74         ret = g_strdup(res + (strlen(ZONEINFO) + 1));
  75 out:
  76         g_free (localtime_filename);
  77         return ret;
  78 }
  79
  80 static gboolean
  81 set_timezone (const gchar *_timezone_name,
  82               GError **error)
  83 {
  84         gboolean ret = FALSE;
  85         gchar *tzpath;
  86
  87         tzpath = g_build_filename(ZONEINFO, _timezone_name, NULL);
  88
  89         g_debug("Setting timezone to %s", tzpath);
  90
  91         if (g_unlink(SYSCONFDIR "/localtime") == -1)
  92                 g_warning("Unable to remove localtime");
  93
  94         if (g_file_make_symbolic_link(localtime_file, tzpath, NULL, error))
  95                 ret = TRUE;
  96
  97         return ret;
  98 }
  99
 100 static const gchar *
 101 ntp_service ()
 102 {
 103         const gchar *service = "ntpd";
 104         return service;
 105 }
 106
 107 static gboolean
 108 service_started (const gchar *service,
 109                  GError **error)
 110 {
 111         return rc_cmd(service, RC_CHECK);
 112 }
 113
 114 static gboolean
 115 service_disable (const gchar *service,
 116                  GError **error)
 117 {
 118         if (!rc_cmd(service, RC_DISABLE)) {
 119                 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
 120                         "unable to disable service: %s", service);
 121                 return FALSE;
 122         }
 123
 124         if (!rc_cmd(service, RC_STOP)) {
 125                 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
 126                         "unable to stop service: %s", service);
 127                 return FALSE;
 128         }
 129
 130         return TRUE;
 131 }
 132
 133 static gboolean
 134 service_enable (const gchar *service,
 135                 GError **error)
 136 {
 137         if (!rc_cmd(service, RC_ENABLE)) {
 138                 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
 139                         "unable to enable service: %s", service);
 140                 return FALSE;
 141         }
 142
 143         if (!rc_cmd(service, RC_START)) {
 144                 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
 145                         "unable to start service: %s", service);
 146                 return FALSE;
 147         }
 148
 149         return TRUE;
 150 }
 151
 152 struct invoked_set_time {
 153         GDBusMethodInvocation *invocation;
 154         gint64 usec_utc;
 155         gboolean relative;
 156 };
 157
 158 static void
 159 on_handle_set_time_authorized_cb (GObject *source_object,
 160                                   GAsyncResult *res,
 161                                   gpointer user_data)
 162 {
 163         GError *err = NULL;
 164         struct invoked_set_time *data = (struct invoked_set_time *) user_data;
 165         struct timespec ts = { 0, 0 };
 166
 167         data = (struct invoked_set_time *) user_data;
 168         if (!check_polkit_finish (res, &err)) {
 169                 g_dbus_method_invocation_return_gerror (data->invocation, err);
 170                 goto out;
 171         }
 172
 173         G_LOCK (clock);
 174         if (!data->relative && data->usec_utc < 0) {
 175                 g_dbus_method_invocation_return_dbus_error (data->invocation, DBUS_ERROR_INVALID_ARGS, "Attempt to set time before epoch");
 176                 goto unlock;
 177         }
 178
 179         if (data->relative && clock_gettime (CLOCK_REALTIME, &ts)) {
 180                 int errsv = errno;
 181                 g_dbus_method_invocation_return_dbus_error (data->invocation, DBUS_ERROR_FAILED, strerror (errsv));
 182                 goto unlock;
 183         }
 184
 185         ts.tv_sec += data->usec_utc / 1000000;
 186         ts.tv_nsec += (data->usec_utc % 1000000) * 1000;
 187         if (clock_settime (CLOCK_REALTIME, &ts)) {
 188                 int errsv = errno;
 189                 g_dbus_method_invocation_return_dbus_error (data->invocation, DBUS_ERROR_FAILED, strerror (errsv));
 190                 goto unlock;
 191         }
 192
 193         poetteringd_timedated_timedate1_complete_set_time (timedate1, data->invocation);
 194
 195 unlock:
 196         G_UNLOCK (clock);
 197
 198 out:
 199         g_free (data);
 200         if (err != NULL)
 201                 g_error_free (err);
 202 }
 203
 204 static gboolean
 205 on_handle_set_time (PoetteringdTimedatedTimedate1 *timedate1,
 206                     GDBusMethodInvocation *invocation,
 207                     const gint64 usec_utc,
 208                     const gboolean relative,
 209                     const gboolean user_interaction,
 210                     gpointer user_data)
 211 {
 212         if (read_only)
 213                 g_dbus_method_invocation_return_dbus_error (invocation,
 214                                                 DBUS_ERROR_NOT_SUPPORTED,
 215                                                 SERVICE_NAME " is in read-only mode");
 216         else {
 217                 struct invoked_set_time *data;
 218                 data = g_new0 (struct invoked_set_time, 1);
 219                 data->invocation = invocation;
 220                 data->usec_utc = usec_utc;
 221                 data->relative = relative;
 222                 check_polkit_async (g_dbus_method_invocation_get_sender (invocation), "org.freedesktop.timedate1.set-time", user_interaction, on_handle_set_time_authorized_cb, data);
 223         }
 224
 225         return TRUE;
 226 }
 227
 228 struct invoked_set_timezone {
 229         GDBusMethodInvocation *invocation;
 230         gchar *timezone; /* newly allocated */
 231 };
 232
 233 static void
 234 on_handle_set_timezone_authorized_cb (GObject *source_object,
 235                                       GAsyncResult *res,
 236                                       gpointer user_data)
 237 {
 238         GError *err = NULL;
 239         struct invoked_set_timezone *data = (struct invoked_set_timezone *) user_data;
 240
 241         if (!check_polkit_finish (res, &err)) {
 242                 g_dbus_method_invocation_return_gerror (data->invocation, err);
 243                 goto out;
 244         }
 245
 246         G_LOCK (clock);
 247         if (!set_timezone(data->timezone, &err)) {
 248                 g_dbus_method_invocation_return_gerror (data->invocation, err);
 249                 goto unlock;
 250         }
 251
 252         poetteringd_timedated_timedate1_complete_set_timezone (timedate1, data->invocation);
 253         g_free (timezone_name);
 254         timezone_name = data->timezone;
 255         poetteringd_timedated_timedate1_set_timezone (timedate1, timezone_name);
 256
 257 unlock:
 258         G_UNLOCK (clock);
 259
 260 out:
 261         g_free (data);
 262         if (err != NULL)
 263                 g_error_free (err);
 264 }
 265
 266 static gboolean
 267 on_handle_set_timezone (PoetteringdTimedatedTimedate1 *timedate1,
 268                         GDBusMethodInvocation *invocation,
 269                         const gchar *timezone,
 270                         const gboolean user_interaction,
 271                         gpointer user_data)
 272 {
 273         if (read_only)
 274                 g_dbus_method_invocation_return_dbus_error (invocation,
 275                                                 DBUS_ERROR_NOT_SUPPORTED,
 276                                                 SERVICE_NAME " is in read-only mode");
 277         else {
 278                 struct invoked_set_timezone *data;
 279                 data = g_new0 (struct invoked_set_timezone, 1);
 280                 data->invocation = invocation;
 281                 data->timezone = g_strdup (timezone);
 282                 check_polkit_async (g_dbus_method_invocation_get_sender (invocation), "org.freedesktop.timedate1.set-timezone", user_interaction, on_handle_set_timezone_authorized_cb, data);
 283         }
 284
 285         return TRUE;
 286 }
 287
 288 struct invoked_set_local_rtc {
 289         GDBusMethodInvocation *invocation;
 290         gboolean local_rtc;
 291         gboolean fix_system;
 292 };
 293
 294 static gboolean
 295 on_handle_set_local_rtc (PoetteringdTimedatedTimedate1 *timedate1,
 296                          GDBusMethodInvocation *invocation,
 297                          const gboolean _local_rtc,
 298                          const gboolean fix_system,
 299                          const gboolean user_interaction,
 300                          gpointer user_data)
 301 {
 302         g_dbus_method_invocation_return_dbus_error (invocation,
 303                         DBUS_ERROR_NOT_SUPPORTED,
 304                         SERVICE_NAME " does not support local RTC");
 305
 306         return TRUE;
 307 }
 308
 309 struct invoked_set_ntp {
 310         GDBusMethodInvocation *invocation;
 311         gboolean use_ntp;
 312 };
 313
 314 static void
 315 on_handle_set_ntp_authorized_cb (GObject *source_object,
 316                                  GAsyncResult *res,
 317                                  gpointer user_data)
 318 {
 319         GError *err = NULL;
 320         struct invoked_set_ntp * data = (struct invoked_set_ntp *) user_data;
 321
 322         if (!check_polkit_finish (res, &err)) {
 323                 g_dbus_method_invocation_return_gerror (data->invocation, err);
 324                 goto out;
 325         }
 326
 327         G_LOCK (ntp);
 328         if ((data->use_ntp && !service_enable (ntp_service (), &err)) ||
 329             (!data->use_ntp && !service_disable (ntp_service (), &err))) {
 330                 g_dbus_method_invocation_return_gerror (data->invocation, err);
 331                 goto unlock;
 332         }
 333
 334         poetteringd_timedated_timedate1_complete_set_ntp (timedate1, data->invocation);
 335         use_ntp = data->use_ntp;
 336         poetteringd_timedated_timedate1_set_ntp (timedate1, use_ntp);
 337
 338 unlock:
 339         G_UNLOCK (ntp);
 340
 341 out:
 342         g_free (data);
 343         if (err != NULL)
 344                 g_error_free (err);
 345 }
 346
 347 static gboolean
 348 on_handle_set_ntp (PoetteringdTimedatedTimedate1 *timedate1,
 349                    GDBusMethodInvocation *invocation,
 350                    const gboolean _use_ntp,
 351                    const gboolean user_interaction,
 352                    gpointer user_data)
 353 {
 354         if (read_only)
 355                 g_dbus_method_invocation_return_dbus_error (invocation,
 356                                                 DBUS_ERROR_NOT_SUPPORTED,
 357                                                 SERVICE_NAME " is in read-only mode");
 358         else {
 359                 struct invoked_set_ntp *data;
 360                 data = g_new0 (struct invoked_set_ntp, 1);
 361                 data->invocation = invocation;
 362                 data->use_ntp = _use_ntp;
 363                 check_polkit_async (g_dbus_method_invocation_get_sender (invocation), "org.freedesktop.timedate1.set-ntp", user_interaction, on_handle_set_ntp_authorized_cb, data);
 364         }
 365
 366         return TRUE;
 367 }
 368
 369 static void
 370 on_bus_acquired (GDBusConnection *connection,
 371                  const gchar     *bus_name,
 372                  gpointer         user_data)
 373 {
 374         GError *err = NULL;
 375
 376         g_debug ("Acquired a message bus connection");
 377
 378         timedate1 = poetteringd_timedated_timedate1_skeleton_new ();
 379
 380         poetteringd_timedated_timedate1_set_timezone (timedate1, timezone_name);
 381         poetteringd_timedated_timedate1_set_local_rtc (timedate1, local_rtc);
 382         poetteringd_timedated_timedate1_set_ntp (timedate1, use_ntp);
 383
 384         g_signal_connect (timedate1, "handle-set-time", G_CALLBACK (on_handle_set_time), NULL);
 385         g_signal_connect (timedate1, "handle-set-timezone", G_CALLBACK (on_handle_set_timezone), NULL);
 386         g_signal_connect (timedate1, "handle-set-local-rtc", G_CALLBACK (on_handle_set_local_rtc), NULL);
 387         g_signal_connect (timedate1, "handle-set-ntp", G_CALLBACK (on_handle_set_ntp), NULL);
 388
 389         if (!g_dbus_interface_skeleton_export (G_DBUS_INTERFACE_SKELETON (timedate1),
 390                                                 connection,
 391                                                 "/org/freedesktop/timedate1",
 392                                                 &err)) {
 393                 if (err != NULL) {
 394                         g_critical ("Failed to export interface on /org/freedesktop/timedate1: %s", err->message);
 395                         poetteringd_exit (1);
 396                 }
 397         }
 398 }
 399
 400 static void
 401 on_name_acquired (GDBusConnection *connection,
 402                   const gchar     *bus_name,
 403                   gpointer         user_data)
 404 {
 405         g_debug ("Acquired the name %s", bus_name);
 406         poetteringd_component_started ();
 407 }
 408
 409 static void
 410 on_name_lost (GDBusConnection *connection,
 411               const gchar     *bus_name,
 412               gpointer         user_data)
 413 {
 414         if (connection == NULL)
 415                 g_critical ("Failed to acquire a dbus connection");
 416         else
 417                 g_critical ("Failed to acquire dbus name %s", bus_name);
 418         poetteringd_exit (1);
 419 }
 420
 421 void
 422 timedated_init (gboolean _read_only)
 423 {
 424         GError *err = NULL;
 425
 426         read_only = _read_only;
 427
 428         localtime_file = g_file_new_for_path (SYSCONFDIR "/localtime");
 429
 430         timezone_name = get_timezone_name (&err);
 431         if (err != NULL) {
 432                 g_warning ("%s", err->message);
 433                 g_clear_error (&err);
 434         }
 435         if (ntp_service () == NULL) {
 436                 g_warning ("No ntp implementation found.");
 437                 use_ntp = FALSE;
 438         } else {
 439                 use_ntp = service_started (ntp_service (), &err);
 440                 if (err != NULL) {
 441                         g_warning ("%s", err->message);
 442                         g_clear_error (&err);
 443                 }
 444         }
 445
 446         bus_id = g_bus_own_name (G_BUS_TYPE_SYSTEM,
 447                         "org.freedesktop.timedate1",
 448                         G_BUS_NAME_OWNER_FLAGS_NONE,
 449                         on_bus_acquired,
 450                         on_name_acquired,
 451                         on_name_lost,
 452                         NULL,
 453                         NULL);
 454 }
 455
 456 void
 457 timedated_destroy (void)
 458 {
 459         g_bus_unown_name (bus_id);
 460         bus_id = 0;
 461         read_only = FALSE;
 462
 463         g_object_unref (localtime_file);
 464 }