src/timedate/timedated.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25
  26 #include "sd-id128.h"
  27 #include "sd-messages.h"
  28 #include "sd-event.h"
  29 #include "sd-bus.h"
  30
  31 #include "util.h"
  32 #include "strv.h"
  33 #include "def.h"
  34 #include "hwclock.h"
  35 #include "conf-files.h"
  36 #include "path-util.h"
  37 #include "fileio-label.h"
  38 #include "label.h"
  39 #include "bus-util.h"
  40 #include "event-util.h"
  41
  42 #define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"
  43 #define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n"
  44
  45 typedef struct Context {
  46         char *zone;
  47         bool local_rtc;
  48         unsigned can_ntp;
  49         unsigned use_ntp;
  50         Hashmap *polkit_registry;
  51 } Context;
  52
  53 static void context_reset(Context *c) {
  54         assert(c);
  55
  56         free(c->zone);
  57         c->zone = NULL;
  58
  59         c->local_rtc = false;
  60         c->can_ntp = c->use_ntp = -1;
  61 }
  62
  63 static void context_free(Context *c, sd_bus *bus) {
  64         assert(c);
  65
  66         context_reset(c);
  67         bus_verify_polkit_async_registry_free(bus, c->polkit_registry);
  68 }
  69
  70 static bool valid_timezone(const char *name) {
  71         const char *p;
  72         char *t;
  73         bool slash = false;
  74         int r;
  75         struct stat st;
  76
  77         assert(name);
  78
  79         if (*name == '/' || *name == 0)
  80                 return false;
  81
  82         for (p = name; *p; p++) {
  83                 if (!(*p >= '0' && *p <= '9') &&
  84                     !(*p >= 'a' && *p <= 'z') &&
  85                     !(*p >= 'A' && *p <= 'Z') &&
  86                     !(*p == '-' || *p == '_' || *p == '+' || *p == '/'))
  87                         return false;
  88
  89                 if (*p == '/') {
  90
  91                         if (slash)
  92                                 return false;
  93
  94                         slash = true;
  95                 } else
  96                         slash = false;
  97         }
  98
  99         if (slash)
 100                 return false;
 101
 102         t = strappend("/usr/share/zoneinfo/", name);
 103         if (!t)
 104                 return false;
 105
 106         r = stat(t, &st);
 107         free(t);
 108
 109         if (r < 0)
 110                 return false;
 111
 112         if (!S_ISREG(st.st_mode))
 113                 return false;
 114
 115         return true;
 116 }
 117
 118 static int context_read_data(Context *c) {
 119         _cleanup_free_ char *t = NULL;
 120         int r;
 121
 122         assert(c);
 123
 124         context_reset(c);
 125
 126         r = readlink_malloc("/etc/localtime", &t);
 127         if (r < 0) {
 128                 if (r == -EINVAL)
 129                         log_warning("/etc/localtime should be a symbolic link to a timezone data file in /usr/share/zoneinfo/.");
 130                 else
 131                         log_warning("Failed to get target of /etc/localtime: %s", strerror(-r));
 132         } else {
 133                 const char *e;
 134
 135                 e = path_startswith(t, "/usr/share/zoneinfo/");
 136                 if (!e)
 137                         e = path_startswith(t, "../usr/share/zoneinfo/");
 138
 139                 if (!e)
 140                         log_warning("/etc/localtime should be a symbolic link to a timezone data file in /usr/share/zoneinfo/.");
 141                 else {
 142                         c->zone = strdup(e);
 143                         if (!c->zone)
 144                                 return log_oom();
 145
 146                         goto have_timezone;
 147                 }
 148         }
 149
 150 have_timezone:
 151         if (isempty(c->zone)) {
 152                 free(c->zone);
 153                 c->zone = NULL;
 154         }
 155
 156         c->local_rtc = hwclock_is_localtime() > 0;
 157
 158         return 0;
 159 }
 160
 161 static int context_write_data_timezone(Context *c) {
 162         _cleanup_free_ char *p = NULL;
 163         int r = 0;
 164
 165         assert(c);
 166
 167         if (isempty(c->zone)) {
 168                 if (unlink("/etc/localtime") < 0 && errno != ENOENT)
 169                         r = -errno;
 170
 171                 return r;
 172         }
 173
 174         p = strappend("../usr/share/zoneinfo/", c->zone);
 175         if (!p)
 176                 return log_oom();
 177
 178         r = symlink_atomic(p, "/etc/localtime");
 179         if (r < 0)
 180                 return r;
 181
 182         return 0;
 183 }
 184
 185 static int context_write_data_local_rtc(Context *c) {
 186         int r;
 187         _cleanup_free_ char *s = NULL, *w = NULL;
 188
 189         assert(c);
 190
 191         r = read_full_file("/etc/adjtime", &s, NULL);
 192         if (r < 0) {
 193                 if (r != -ENOENT)
 194                         return r;
 195
 196                 if (!c->local_rtc)
 197                         return 0;
 198
 199                 w = strdup(NULL_ADJTIME_LOCAL);
 200                 if (!w)
 201                         return -ENOMEM;
 202         } else {
 203                 char *p, *e;
 204                 size_t a, b;
 205
 206                 p = strchr(s, '\n');
 207                 if (!p)
 208                         return -EIO;
 209
 210                 p = strchr(p+1, '\n');
 211                 if (!p)
 212                         return -EIO;
 213
 214                 p++;
 215                 e = strchr(p, '\n');
 216                 if (!e)
 217                         return -EIO;
 218
 219                 a = p - s;
 220                 b = strlen(e);
 221
 222                 w = new(char, a + (c->local_rtc ? 5 : 3) + b + 1);
 223                 if (!w)
 224                         return -ENOMEM;
 225
 226                 *(char*) mempcpy(stpcpy(mempcpy(w, s, a), c->local_rtc ? "LOCAL" : "UTC"), e, b) = 0;
 227
 228                 if (streq(w, NULL_ADJTIME_UTC)) {
 229                         if (unlink("/etc/adjtime") < 0)
 230                                 if (errno != ENOENT)
 231                                         return -errno;
 232
 233                         return 0;
 234                 }
 235         }
 236
 237         label_init("/etc");
 238         return write_string_file_atomic_label("/etc/adjtime", w);
 239 }
 240
 241 static char** get_ntp_services(void) {
 242         _cleanup_strv_free_ char **r = NULL, **files = NULL;
 243         char **i;
 244         int k;
 245
 246         k = conf_files_list(&files, ".list", NULL,
 247                             "/etc/systemd/ntp-units.d",
 248                             "/run/systemd/ntp-units.d",
 249                             "/usr/local/lib/systemd/ntp-units.d",
 250                             "/usr/lib/systemd/ntp-units.d",
 251                             NULL);
 252         if (k < 0)
 253                 return NULL;
 254
 255         STRV_FOREACH(i, files) {
 256                 _cleanup_fclose_ FILE *f;
 257
 258                 f = fopen(*i, "re");
 259                 if (!f)
 260                         continue;
 261
 262                 for (;;) {
 263                         char line[PATH_MAX], *l;
 264
 265                         if (!fgets(line, sizeof(line), f)) {
 266
 267                                 if (ferror(f))
 268                                         log_error("Failed to read NTP units file: %m");
 269
 270                                 break;
 271                         }
 272
 273                         l = strstrip(line);
 274                         if (l[0] == 0 || l[0] == '#')
 275                                 continue;
 276
 277                         if (strv_extend(&r, l) < 0) {
 278                                 log_oom();
 279                                 return NULL;
 280                         }
 281                 }
 282         }
 283
 284         i = r;
 285         r = NULL; /* avoid cleanup */
 286
 287         return strv_uniq(i);
 288 }
 289
 290 static int context_read_ntp(Context *c, sd_bus *bus) {
 291         _cleanup_strv_free_ char **l;
 292         char **i;
 293         int r;
 294
 295         assert(c);
 296         assert(bus);
 297
 298         l = get_ntp_services();
 299         STRV_FOREACH(i, l) {
 300                 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 301                 sd_bus_message *reply = NULL;
 302                 const char *s;
 303
 304                 r = sd_bus_call_method(
 305                                 bus,
 306                                 "org.freedesktop.systemd1",
 307                                 "/org/freedesktop/systemd1",
 308                                 "org.freedesktop.systemd1.Manager",
 309                                 "GetUnitFileState",
 310                                 &error,
 311                                 &reply,
 312                                 "s",
 313                                 *i);
 314
 315                 if (r < 0) {
 316                         /* This implementation does not exist, try next one */
 317                         if (sd_bus_error_has_name(&error, SD_BUS_ERROR_FILE_NOT_FOUND))
 318                                 continue;
 319
 320                         return r;
 321                 }
 322
 323                 r = sd_bus_message_read(reply, "s", &s);
 324                 if (r < 0)
 325                         return r;
 326
 327                 c->can_ntp = 1;
 328                 c->use_ntp =
 329                         streq(s, "enabled") ||
 330                         streq(s, "enabled-runtime");
 331
 332                 return 0;
 333         }
 334
 335         /* NTP is not installed. */
 336         c->can_ntp = 0;
 337         c->use_ntp = 0;
 338
 339         return 0;
 340 }
 341
 342 static int context_start_ntp(Context *c, sd_bus *bus, sd_bus_error *error) {
 343         _cleanup_strv_free_ char **l = NULL;
 344         char **i;
 345         int r;
 346
 347         assert(c);
 348         assert(bus);
 349         assert(error);
 350
 351         l = get_ntp_services();
 352         STRV_FOREACH(i, l) {
 353
 354                 if (c->use_ntp)
 355                         r = sd_bus_call_method(
 356                                         bus,
 357                                         "org.freedesktop.systemd1",
 358                                         "/org/freedesktop/systemd1",
 359                                         "org.freedesktop.systemd1.Manager",
 360                                         "StartUnit",
 361                                         error,
 362                                         NULL,
 363                                         "ss", *i, "replace");
 364                 else
 365                         r = sd_bus_call_method(
 366                                         bus,
 367                                         "org.freedesktop.systemd1",
 368                                         "/org/freedesktop/systemd1",
 369                                         "org.freedesktop.systemd1.Manager",
 370                                         "StopUnit",
 371                                         error,
 372                                         NULL,
 373                                         "ss", *i, "replace");
 374
 375                 if (r < 0) {
 376                         if (sd_bus_error_has_name(error, SD_BUS_ERROR_FILE_NOT_FOUND) ||
 377                             sd_bus_error_has_name(error, "org.freedesktop.systemd1.LoadFailed") ||
 378                             sd_bus_error_has_name(error, "org.freedesktop.systemd1.NoSuchUnit")) {
 379                                 /* This implementation does not exist, try next one */
 380                                 sd_bus_error_free(error);
 381                                 continue;
 382                         }
 383
 384                         return r;
 385                 }
 386
 387                 return 1;
 388         }
 389
 390         sd_bus_error_set_const(error, "org.freedesktop.timedate1.NoNTPSupport", "NTP not supported.");
 391         return -ENOTSUP;
 392 }
 393
 394 static int context_enable_ntp(Context*c, sd_bus *bus, sd_bus_error *error) {
 395         _cleanup_strv_free_ char **l = NULL;
 396         char **i;
 397         int r;
 398
 399         assert(c);
 400         assert(bus);
 401         assert(error);
 402
 403         l = get_ntp_services();
 404         STRV_FOREACH(i, l) {
 405                 if (c->use_ntp)
 406                         r = sd_bus_call_method(
 407                                         bus,
 408                                         "org.freedesktop.systemd1",
 409                                         "/org/freedesktop/systemd1",
 410                                         "org.freedesktop.systemd1.Manager",
 411                                         "EnableUnitFiles",
 412                                         error,
 413                                         NULL,
 414                                         "asbb", 1, *i, false, true);
 415                 else
 416                         r = sd_bus_call_method(
 417                                         bus,
 418                                         "org.freedesktop.systemd1",
 419                                         "/org/freedesktop/systemd1",
 420                                         "org.freedesktop.systemd1.Manager",
 421                                         "DisableUnitFiles",
 422                                         error,
 423                                         NULL,
 424                                         "asb", 1, *i, false);
 425
 426                 if (r < 0) {
 427                         if (sd_bus_error_has_name(error, SD_BUS_ERROR_FILE_NOT_FOUND)) {
 428                                 /* This implementation does not exist, try next one */
 429                                 sd_bus_error_free(error);
 430                                 continue;
 431                         }
 432
 433                         return r;
 434                 }
 435
 436                 r = sd_bus_call_method(
 437                                 bus,
 438                                 "org.freedesktop.systemd1",
 439                                 "/org/freedesktop/systemd1",
 440                                 "org.freedesktop.systemd1.Manager",
 441                                 "Reload",
 442                                 error,
 443                                 NULL,
 444                                 NULL);
 445                 if (r < 0)
 446                         return r;
 447
 448                 return 1;
 449         }
 450
 451         sd_bus_error_set_const(error, "org.freedesktop.timedate1.NoNTPSupport", "NTP not supported.");
 452         return -ENOTSUP;
 453 }
 454
 455 static int property_get_rtc_time(
 456                 sd_bus *bus,
 457                 const char *path,
 458                 const char *interface,
 459                 const char *property,
 460                 sd_bus_message *reply,
 461                 void *userdata,
 462                 sd_bus_error *error) {
 463
 464         struct tm tm;
 465         usec_t t;
 466         int r;
 467
 468         zero(tm);
 469         r = hwclock_get_time(&tm);
 470         if (r == -EBUSY) {
 471                 log_warning("/dev/rtc is busy, is somebody keeping it open continously? That's not a good idea... Returning a bogus RTC timestamp.");
 472                 t = 0;
 473         } else if (r < 0)
 474                 return sd_bus_error_set_errnof(error, r, "Failed to read RTC: %s", strerror(-r));
 475         else
 476                 t = (usec_t) timegm(&tm) * USEC_PER_SEC;
 477
 478         return sd_bus_message_append(reply, "t", t);
 479 }
 480
 481 static int property_get_time(
 482                 sd_bus *bus,
 483                 const char *path,
 484                 const char *interface,
 485                 const char *property,
 486                 sd_bus_message *reply,
 487                 void *userdata,
 488                 sd_bus_error *error) {
 489
 490         return sd_bus_message_append(reply, "t", now(CLOCK_REALTIME));
 491 }
 492
 493 static int property_get_ntp_sync(
 494                 sd_bus *bus,
 495                 const char *path,
 496                 const char *interface,
 497                 const char *property,
 498                 sd_bus_message *reply,
 499                 void *userdata,
 500                 sd_bus_error *error) {
 501
 502         return sd_bus_message_append(reply, "b", ntp_synced());
 503 }
 504
 505 static int method_set_timezone(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 506         Context *c = userdata;
 507         const char *z;
 508         int interactive;
 509         char *t;
 510         int r;
 511
 512         assert(bus);
 513         assert(m);
 514         assert(c);
 515
 516         r = sd_bus_message_read(m, "sb", &z, &interactive);
 517         if (r < 0)
 518                 return r;
 519
 520         if (!valid_timezone(z))
 521                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid time zone '%s'", z);
 522
 523         if (streq_ptr(z, c->zone))
 524                 return sd_bus_reply_method_return(m, NULL);
 525
 526         r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-timezone", interactive, error, method_set_timezone, c);
 527         if (r < 0)
 528                 return r;
 529         if (r == 0)
 530                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 531
 532         t = strdup(z);
 533         if (!t)
 534                 return -ENOMEM;
 535
 536         free(c->zone);
 537         c->zone = t;
 538
 539         /* 1. Write new configuration file */
 540         r = context_write_data_timezone(c);
 541         if (r < 0) {
 542                 log_error("Failed to set timezone: %s", strerror(-r));
 543                 return sd_bus_error_set_errnof(error, r, "Failed to set timezone: %s", strerror(-r));
 544         }
 545
 546         /* 2. Tell the kernel our timezone */
 547         hwclock_set_timezone(NULL);
 548
 549         if (c->local_rtc) {
 550                 struct timespec ts;
 551                 struct tm *tm;
 552
 553                 /* 3. Sync RTC from system clock, with the new delta */
 554                 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
 555                 assert_se(tm = localtime(&ts.tv_sec));
 556                 hwclock_set_time(tm);
 557         }
 558
 559         log_struct(LOG_INFO,
 560                    MESSAGE_ID(SD_MESSAGE_TIMEZONE_CHANGE),
 561                    "TIMEZONE=%s", c->zone,
 562                    "MESSAGE=Changed timezone to '%s'.", c->zone,
 563                    NULL);
 564
 565         sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "Timezone", NULL);
 566
 567         return sd_bus_reply_method_return(m, NULL);
 568 }
 569
 570 static int method_set_local_rtc(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 571         int lrtc, fix_system, interactive;
 572         Context *c = userdata;
 573         struct timespec ts;
 574         int r;
 575
 576         assert(bus);
 577         assert(m);
 578         assert(c);
 579
 580         r = sd_bus_message_read(m, "bbb", &lrtc, &fix_system, &interactive);
 581         if (r < 0)
 582                 return r;
 583
 584         if (lrtc == c->local_rtc)
 585                 return sd_bus_reply_method_return(m, NULL);
 586
 587         r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-local-rtc", interactive, error, method_set_local_rtc, c);
 588         if (r < 0)
 589                 return r;
 590         if (r == 0)
 591                 return 1;
 592
 593         c->local_rtc = lrtc;
 594
 595         /* 1. Write new configuration file */
 596         r = context_write_data_local_rtc(c);
 597         if (r < 0) {
 598                 log_error("Failed to set RTC to local/UTC: %s", strerror(-r));
 599                 return sd_bus_error_set_errnof(error, r, "Failed to set RTC to local/UTC: %s", strerror(-r));
 600         }
 601
 602         /* 2. Tell the kernel our timezone */
 603         hwclock_set_timezone(NULL);
 604
 605         /* 3. Synchronize clocks */
 606         assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
 607
 608         if (fix_system) {
 609                 struct tm tm;
 610
 611                 /* Sync system clock from RTC; first,
 612                  * initialize the timezone fields of
 613                  * struct tm. */
 614                 if (c->local_rtc)
 615                         tm = *localtime(&ts.tv_sec);
 616                 else
 617                         tm = *gmtime(&ts.tv_sec);
 618
 619                 /* Override the main fields of
 620                  * struct tm, but not the timezone
 621                  * fields */
 622                 if (hwclock_get_time(&tm) >= 0) {
 623
 624                         /* And set the system clock
 625                          * with this */
 626                         if (c->local_rtc)
 627                                 ts.tv_sec = mktime(&tm);
 628                         else
 629                                 ts.tv_sec = timegm(&tm);
 630
 631                         clock_settime(CLOCK_REALTIME, &ts);
 632                 }
 633
 634         } else {
 635                 struct tm *tm;
 636
 637                 /* Sync RTC from system clock */
 638                 if (c->local_rtc)
 639                         tm = localtime(&ts.tv_sec);
 640                 else
 641                         tm = gmtime(&ts.tv_sec);
 642
 643                 hwclock_set_time(tm);
 644         }
 645
 646         log_info("RTC configured to %s time.", c->local_rtc ? "local" : "UTC");
 647
 648         sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "LocalRTC", NULL);
 649
 650         return sd_bus_reply_method_return(m, NULL);
 651 }
 652
 653 static int method_set_time(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 654         int relative, interactive;
 655         Context *c = userdata;
 656         int64_t utc;
 657         struct timespec ts;
 658         struct tm* tm;
 659         int r;
 660
 661         assert(bus);
 662         assert(m);
 663         assert(c);
 664
 665         r = sd_bus_message_read(m, "xbb", &utc, &relative, &interactive);
 666         if (r < 0)
 667                 return r;
 668
 669         if (!relative && utc <= 0)
 670                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid absolute time");
 671
 672         if (relative && utc == 0)
 673                 return sd_bus_reply_method_return(m, NULL);
 674
 675         if (relative) {
 676                 usec_t n, x;
 677
 678                 n = now(CLOCK_REALTIME);
 679                 x = n + utc;
 680
 681                 if ((utc > 0 && x < n) ||
 682                     (utc < 0 && x > n))
 683                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Time value overflow");
 684
 685                 timespec_store(&ts, x);
 686         } else
 687                 timespec_store(&ts, (usec_t) utc);
 688
 689         r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-time", interactive, error, method_set_time, c);
 690         if (r < 0)
 691                 return r;
 692         if (r == 0)
 693                 return 1;
 694
 695         /* Set system clock */
 696         if (clock_settime(CLOCK_REALTIME, &ts) < 0) {
 697                 log_error("Failed to set local time: %m");
 698                 return sd_bus_error_set_errnof(error, errno, "Failed to set local time: %m");
 699         }
 700
 701         /* Sync down to RTC */
 702         if (c->local_rtc)
 703                 tm = localtime(&ts.tv_sec);
 704         else
 705                 tm = gmtime(&ts.tv_sec);
 706
 707         hwclock_set_time(tm);
 708
 709         log_struct(LOG_INFO,
 710                    MESSAGE_ID(SD_MESSAGE_TIME_CHANGE),
 711                    "REALTIME=%llu", (unsigned long long) timespec_load(&ts),
 712                    "MESSAGE=Changed local time to %s", ctime(&ts.tv_sec),
 713                    NULL);
 714
 715         return sd_bus_reply_method_return(m, NULL);
 716 }
 717
 718 static int method_set_ntp(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 719         int ntp, interactive;
 720         Context *c = userdata;
 721         int r;
 722
 723         r = sd_bus_message_read(m, "bb", &ntp, &interactive);
 724         if (r < 0)
 725                 return r;
 726
 727         if ((bool)ntp == c->use_ntp)
 728                 return sd_bus_reply_method_return(m, NULL);
 729
 730         r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-ntp", interactive, error, method_set_ntp, c);
 731         if (r < 0)
 732                 return r;
 733         if (r == 0)
 734                 return 1;
 735
 736         c->use_ntp = ntp;
 737
 738         r = context_enable_ntp(c, bus, error);
 739         if (r < 0)
 740                 return r;
 741
 742         r = context_start_ntp(c, bus, error);
 743         if (r < 0)
 744                 return r;
 745
 746         log_info("Set NTP to %s", c->use_ntp ? "enabled" : "disabled");
 747
 748         sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "NTP", NULL);
 749
 750         return sd_bus_reply_method_return(m, NULL);
 751 }
 752
 753 static const sd_bus_vtable timedate_vtable[] = {
 754         SD_BUS_VTABLE_START(0),
 755         SD_BUS_PROPERTY("Timezone", "s", NULL, offsetof(Context, zone), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 756         SD_BUS_PROPERTY("LocalRTC", "b", NULL, offsetof(Context, local_rtc), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 757         SD_BUS_PROPERTY("CanNTP", "b", bus_property_get_tristate, offsetof(Context, can_ntp), 0),
 758         SD_BUS_PROPERTY("NTP", "b", bus_property_get_tristate, offsetof(Context, use_ntp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 759         SD_BUS_PROPERTY("NTPSynchronized", "b", property_get_ntp_sync, 0, 0),
 760         SD_BUS_PROPERTY("TimeUSec", "t", property_get_time, 0, 0),
 761         SD_BUS_PROPERTY("RTCTimeUSec", "t", property_get_rtc_time, 0, 0),
 762         SD_BUS_METHOD("SetTime", "xbb", NULL, method_set_time, 0),
 763         SD_BUS_METHOD("SetTimezone", "sb", NULL, method_set_timezone, 0),
 764         SD_BUS_METHOD("SetLocalRTC", "bbb", NULL, method_set_local_rtc, 0),
 765         SD_BUS_METHOD("SetNTP", "bb", NULL, method_set_ntp, 0),
 766         SD_BUS_VTABLE_END,
 767 };
 768
 769 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
 770         _cleanup_bus_unref_ sd_bus *bus = NULL;
 771         int r;
 772
 773         assert(c);
 774         assert(event);
 775         assert(_bus);
 776
 777         r = sd_bus_default_system(&bus);
 778         if (r < 0) {
 779                 log_error("Failed to get system bus connection: %s", strerror(-r));
 780                 return r;
 781         }
 782
 783         r = sd_bus_add_object_vtable(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", timedate_vtable, c);
 784         if (r < 0) {
 785                 log_error("Failed to register object: %s", strerror(-r));
 786                 return r;
 787         }
 788
 789         r = sd_bus_request_name(bus, "org.freedesktop.timedate1", SD_BUS_NAME_DO_NOT_QUEUE);
 790         if (r < 0) {
 791                 log_error("Failed to register name: %s", strerror(-r));
 792                 return r;
 793         }
 794
 795         if (r != SD_BUS_NAME_PRIMARY_OWNER) {
 796                 log_error("Failed to acquire name.");
 797                 return -EEXIST;
 798         }
 799
 800         r = sd_bus_attach_event(bus, event, 0);
 801         if (r < 0) {
 802                 log_error("Failed to attach bus to event loop: %s", strerror(-r));
 803                 return r;
 804         }
 805
 806         *_bus = bus;
 807         bus = NULL;
 808
 809         return 0;
 810 }
 811
 812 int main(int argc, char *argv[]) {
 813         Context context = {
 814                 .zone = NULL,
 815                 .local_rtc = false,
 816                 .can_ntp = -1,
 817                 .use_ntp = -1,
 818         };
 819
 820         _cleanup_event_unref_ sd_event *event = NULL;
 821         _cleanup_bus_unref_ sd_bus *bus = NULL;
 822         int r;
 823
 824         log_set_target(LOG_TARGET_AUTO);
 825         log_parse_environment();
 826         log_open();
 827
 828         umask(0022);
 829
 830         if (argc != 1) {
 831                 log_error("This program takes no arguments.");
 832                 r = -EINVAL;
 833                 goto finish;
 834         }
 835
 836         r = sd_event_default(&event);
 837         if (r < 0) {
 838                 log_error("Failed to allocate event loop: %s", strerror(-r));
 839                 goto finish;
 840         }
 841
 842         r = connect_bus(&context, event, &bus);
 843         if (r < 0)
 844                 goto finish;
 845
 846         r = context_read_data(&context);
 847         if (r < 0) {
 848                 log_error("Failed to read timezone data: %s", strerror(-r));
 849                 goto finish;
 850         }
 851
 852         r = context_read_ntp(&context, bus);
 853         if (r < 0) {
 854                 log_error("Failed to determine whether NTP is enabled: %s", strerror(-r));
 855                 goto finish;
 856         }
 857
 858         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.timedate1", DEFAULT_EXIT_USEC);
 859         if (r < 0) {
 860                 log_error("Failed to run event loop: %s", strerror(-r));
 861                 goto finish;
 862         }
 863
 864         r = 0;
 865
 866 finish:
 867         context_free(&context, bus);
 868
 869         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 870 }