src/timedate/timedated.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <string.h>
   5 #include <unistd.h>
   6
   7 #include "sd-bus.h"
   8 #include "sd-event.h"
   9 #include "sd-messages.h"
  10
  11 #include "alloc-util.h"
  12 #include "bus-common-errors.h"
  13 #include "bus-error.h"
  14 #include "bus-util.h"
  15 #include "clock-util.h"
  16 #include "def.h"
  17 #include "fileio-label.h"
  18 #include "fs-util.h"
  19 #include "hashmap.h"
  20 #include "list.h"
  21 #include "path-util.h"
  22 #include "selinux-util.h"
  23 #include "signal-util.h"
  24 #include "string-util.h"
  25 #include "strv.h"
  26 #include "unit-def.h"
  27 #include "unit-name.h"
  28 #include "user-util.h"
  29 #include "util.h"
  30
  31 #define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"
  32 #define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n"
  33
  34 typedef struct UnitStatusInfo {
  35         char *name;
  36         char *load_state;
  37         char *unit_file_state;
  38         char *active_state;
  39
  40         LIST_FIELDS(struct UnitStatusInfo, units);
  41 } UnitStatusInfo;
  42
  43 typedef struct Context {
  44         char *zone;
  45         bool local_rtc;
  46         Hashmap *polkit_registry;
  47         sd_bus_message *cache;
  48
  49         sd_bus_slot *slot_job_removed;
  50         char *path_ntp_unit;
  51
  52         LIST_HEAD(UnitStatusInfo, units);
  53 } Context;
  54
  55 static void unit_status_info_clear(UnitStatusInfo *p) {
  56         assert(p);
  57
  58         p->load_state = mfree(p->load_state);
  59         p->unit_file_state = mfree(p->unit_file_state);
  60         p->active_state = mfree(p->active_state);
  61 }
  62
  63 static void unit_status_info_free(UnitStatusInfo *p) {
  64         assert(p);
  65
  66         unit_status_info_clear(p);
  67         free(p->name);
  68         free(p);
  69 }
  70
  71 static void context_free(Context *c) {
  72         UnitStatusInfo *p;
  73
  74         assert(c);
  75
  76         free(c->zone);
  77         bus_verify_polkit_async_registry_free(c->polkit_registry);
  78         sd_bus_message_unref(c->cache);
  79
  80         sd_bus_slot_unref(c->slot_job_removed);
  81         free(c->path_ntp_unit);
  82
  83         while ((p = c->units)) {
  84                 LIST_REMOVE(units, c->units, p);
  85                 unit_status_info_free(p);
  86         }
  87 }
  88
  89 static int context_add_ntp_service(Context *c, const char *s) {
  90         UnitStatusInfo *u;
  91
  92         if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
  93                 return -EINVAL;
  94
  95         /* Do not add this if it is already listed */
  96         LIST_FOREACH(units, u, c->units)
  97                 if (streq(u->name, s))
  98                         return 0;
  99
 100         u = new0(UnitStatusInfo, 1);
 101         if (!u)
 102                 return -ENOMEM;
 103
 104         u->name = strdup(s);
 105         if (!u->name) {
 106                 free(u);
 107                 return -ENOMEM;
 108         }
 109
 110         LIST_APPEND(units, c->units, u);
 111
 112         return 0;
 113 }
 114
 115 static int context_parse_ntp_services(Context *c) {
 116         const char *env, *p;
 117         int r;
 118
 119         assert(c);
 120
 121         env = getenv("SYSTEMD_TIMEDATED_NTP_SERVICES");
 122         if (!env) {
 123                 r = context_add_ntp_service(c, "systemd-timesyncd.service");
 124                 if (r < 0)
 125                         log_warning_errno(r, "Failed to add NTP service \"systemd-timesyncd.service\", ignoring: %m");
 126
 127                 return 0;
 128         }
 129
 130         for (p = env;;) {
 131                 _cleanup_free_ char *word = NULL;
 132
 133                 r = extract_first_word(&p, &word, ":", 0);
 134                 if (r == 0)
 135                         break;
 136                 if (r == -ENOMEM)
 137                         return log_oom();
 138                 if (r < 0) {
 139                         log_error("Invalid syntax, ignoring: %s", env);
 140                         break;
 141                 }
 142
 143                 r = context_add_ntp_service(c, word);
 144                 if (r < 0)
 145                         log_warning_errno(r, "Failed to add NTP service \"%s\", ignoring: %m", word);
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int context_ntp_service_is_active(Context *c) {
 152         UnitStatusInfo *info;
 153         int count = 0;
 154
 155         assert(c);
 156
 157         /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */
 158
 159         LIST_FOREACH(units, info, c->units)
 160                 count += streq_ptr(info->active_state, "active");
 161
 162         return count;
 163 }
 164
 165 static int context_ntp_service_is_enabled(Context *c) {
 166         UnitStatusInfo *info;
 167         int count = 0;
 168
 169         assert(c);
 170
 171         /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */
 172
 173         LIST_FOREACH(units, info, c->units)
 174                 count += STRPTR_IN_SET(info->unit_file_state, "enabled", "enabled-runtime");
 175
 176         return count;
 177 }
 178
 179 static int context_ntp_service_exists(Context *c) {
 180         UnitStatusInfo *info;
 181         int count = 0;
 182
 183         assert(c);
 184
 185         /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */
 186
 187         LIST_FOREACH(units, info, c->units)
 188                 count += streq_ptr(info->load_state, "loaded");
 189
 190         return count;
 191 }
 192
 193 static int context_read_data(Context *c) {
 194         _cleanup_free_ char *t = NULL;
 195         int r;
 196
 197         assert(c);
 198
 199         r = get_timezone(&t);
 200         if (r == -EINVAL)
 201                 log_warning_errno(r, "/etc/localtime should be a symbolic link to a time zone data file in /usr/share/zoneinfo/.");
 202         else if (r < 0)
 203                 log_warning_errno(r, "Failed to get target of /etc/localtime: %m");
 204
 205         free_and_replace(c->zone, t);
 206
 207         c->local_rtc = clock_is_localtime(NULL) > 0;
 208
 209         return 0;
 210 }
 211
 212 static int context_write_data_timezone(Context *c) {
 213         _cleanup_free_ char *p = NULL;
 214         int r = 0;
 215
 216         assert(c);
 217
 218         if (isempty(c->zone)) {
 219                 if (unlink("/etc/localtime") < 0 && errno != ENOENT)
 220                         r = -errno;
 221
 222                 return r;
 223         }
 224
 225         p = strappend("../usr/share/zoneinfo/", c->zone);
 226         if (!p)
 227                 return log_oom();
 228
 229         r = symlink_atomic(p, "/etc/localtime");
 230         if (r < 0)
 231                 return r;
 232
 233         return 0;
 234 }
 235
 236 static int context_write_data_local_rtc(Context *c) {
 237         int r;
 238         _cleanup_free_ char *s = NULL, *w = NULL;
 239
 240         assert(c);
 241
 242         r = read_full_file("/etc/adjtime", &s, NULL);
 243         if (r < 0) {
 244                 if (r != -ENOENT)
 245                         return r;
 246
 247                 if (!c->local_rtc)
 248                         return 0;
 249
 250                 w = strdup(NULL_ADJTIME_LOCAL);
 251                 if (!w)
 252                         return -ENOMEM;
 253         } else {
 254                 char *p;
 255                 const char *e = "\n"; /* default if there is less than 3 lines */
 256                 const char *prepend = "";
 257                 size_t a, b;
 258
 259                 p = strchrnul(s, '\n');
 260                 if (*p == '\0')
 261                         /* only one line, no \n terminator */
 262                         prepend = "\n0\n";
 263                 else if (p[1] == '\0') {
 264                         /* only one line, with \n terminator */
 265                         ++p;
 266                         prepend = "0\n";
 267                 } else {
 268                         p = strchr(p+1, '\n');
 269                         if (!p) {
 270                                 /* only two lines, no \n terminator */
 271                                 prepend = "\n";
 272                                 p = s + strlen(s);
 273                         } else {
 274                                 char *end;
 275                                 /* third line might have a \n terminator or not */
 276                                 p++;
 277                                 end = strchr(p, '\n');
 278                                 /* if we actually have a fourth line, use that as suffix "e", otherwise the default \n */
 279                                 if (end)
 280                                         e = end;
 281                         }
 282                 }
 283
 284                 a = p - s;
 285                 b = strlen(e);
 286
 287                 w = new(char, a + (c->local_rtc ? 5 : 3) + strlen(prepend) + b + 1);
 288                 if (!w)
 289                         return -ENOMEM;
 290
 291                 *(char*) mempcpy(stpcpy(stpcpy(mempcpy(w, s, a), prepend), c->local_rtc ? "LOCAL" : "UTC"), e, b) = 0;
 292
 293                 if (streq(w, NULL_ADJTIME_UTC)) {
 294                         if (unlink("/etc/adjtime") < 0)
 295                                 if (errno != ENOENT)
 296                                         return -errno;
 297
 298                         return 0;
 299                 }
 300         }
 301
 302         mac_selinux_init();
 303         return write_string_file_atomic_label("/etc/adjtime", w);
 304 }
 305
 306 static int context_update_ntp_status(Context *c, sd_bus *bus, sd_bus_message *m) {
 307         static const struct bus_properties_map map[] = {
 308                 { "LoadState",     "s", NULL, offsetof(UnitStatusInfo, load_state)      },
 309                 { "ActiveState",   "s", NULL, offsetof(UnitStatusInfo, active_state)    },
 310                 { "UnitFileState", "s", NULL, offsetof(UnitStatusInfo, unit_file_state) },
 311                 {}
 312         };
 313         UnitStatusInfo *u;
 314         int r;
 315
 316         assert(c);
 317         assert(bus);
 318
 319         /* Suppress calling context_update_ntp_status() multiple times within single DBus transaction. */
 320         if (m) {
 321                 if (m == c->cache)
 322                         return 0;
 323
 324                 sd_bus_message_unref(c->cache);
 325                 c->cache = sd_bus_message_ref(m);
 326         }
 327
 328         LIST_FOREACH(units, u, c->units) {
 329                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 330                 _cleanup_free_ char *path = NULL;
 331
 332                 unit_status_info_clear(u);
 333
 334                 path = unit_dbus_path_from_name(u->name);
 335                 if (!path)
 336                         return -ENOMEM;
 337
 338                 r = bus_map_all_properties(
 339                                 bus,
 340                                 "org.freedesktop.systemd1",
 341                                 path,
 342                                 map,
 343                                 BUS_MAP_STRDUP,
 344                                 &error,
 345                                 NULL,
 346                                 u);
 347                 if (r < 0)
 348                         return log_error_errno(r, "Failed to get properties: %s", bus_error_message(&error, r));
 349         }
 350
 351         return 0;
 352 }
 353
 354 static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 355         const char *path;
 356         Context *c = userdata;
 357         int r;
 358
 359         assert(c);
 360         assert(m);
 361
 362         r = sd_bus_message_read(m, "uoss", NULL, &path, NULL, NULL);
 363         if (r < 0) {
 364                 bus_log_parse_error(r);
 365                 return 0;
 366         }
 367
 368         if (!streq_ptr(path, c->path_ntp_unit))
 369                 return 0;
 370
 371         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "NTP", NULL);
 372
 373         c->slot_job_removed = sd_bus_slot_unref(c->slot_job_removed);
 374         c->path_ntp_unit = mfree(c->path_ntp_unit);
 375
 376         return 0;
 377 }
 378
 379 static int unit_start_or_stop(Context *c, UnitStatusInfo *u, sd_bus *bus, sd_bus_error *error, bool start) {
 380         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 381         _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *slot = NULL;
 382         const char *path;
 383         int r;
 384
 385         assert(c);
 386         assert(u);
 387         assert(bus);
 388         assert(error);
 389
 390         /* This method may be called frequently. Forget the previous job if it has not completed yet. */
 391         c->slot_job_removed = sd_bus_slot_unref(c->slot_job_removed);
 392
 393         r = sd_bus_match_signal_async(
 394                         bus,
 395                         &slot,
 396                         "org.freedesktop.systemd1",
 397                         "/org/freedesktop/systemd1",
 398                         "org.freedesktop.systemd1.Manager",
 399                         "JobRemoved",
 400                         match_job_removed, NULL, c);
 401         if (r < 0)
 402                 return r;
 403
 404         r = sd_bus_call_method(
 405                 bus,
 406                 "org.freedesktop.systemd1",
 407                 "/org/freedesktop/systemd1",
 408                 "org.freedesktop.systemd1.Manager",
 409                 start ? "StartUnit" : "StopUnit",
 410                 error,
 411                 &reply,
 412                 "ss",
 413                 u->name,
 414                 "replace");
 415         if (r < 0)
 416                 return r;
 417
 418         r = sd_bus_message_read(reply, "o", &path);
 419         if (r < 0)
 420                 return bus_log_parse_error(r);
 421
 422         r = free_and_strdup(&c->path_ntp_unit, path);
 423         if (r < 0)
 424                 return log_oom();
 425
 426         c->slot_job_removed = TAKE_PTR(slot);
 427         return 0;
 428 }
 429
 430 static int unit_enable_or_disable(UnitStatusInfo *u, sd_bus *bus, sd_bus_error *error, bool enable) {
 431         int r;
 432
 433         assert(u);
 434         assert(bus);
 435         assert(error);
 436
 437         /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */
 438
 439         if (streq(u->unit_file_state, "enabled") == enable)
 440                 return 0;
 441
 442         if (enable)
 443                 r = sd_bus_call_method(
 444                                 bus,
 445                                 "org.freedesktop.systemd1",
 446                                 "/org/freedesktop/systemd1",
 447                                 "org.freedesktop.systemd1.Manager",
 448                                 "EnableUnitFiles",
 449                                 error,
 450                                 NULL,
 451                                 "asbb", 1,
 452                                 u->name,
 453                                 false, true);
 454         else
 455                 r = sd_bus_call_method(
 456                                 bus,
 457                                 "org.freedesktop.systemd1",
 458                                 "/org/freedesktop/systemd1",
 459                                 "org.freedesktop.systemd1.Manager",
 460                                 "DisableUnitFiles",
 461                                 error,
 462                                 NULL,
 463                                 "asb", 1,
 464                                 u->name,
 465                                 false);
 466         if (r < 0)
 467                 return r;
 468
 469         r = sd_bus_call_method(
 470                         bus,
 471                         "org.freedesktop.systemd1",
 472                         "/org/freedesktop/systemd1",
 473                         "org.freedesktop.systemd1.Manager",
 474                         "Reload",
 475                         error,
 476                         NULL,
 477                         NULL);
 478         if (r < 0)
 479                 return r;
 480
 481         return 0;
 482 }
 483
 484 static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_time, "t", now(CLOCK_REALTIME));
 485 static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_ntp_sync, "b", ntp_synced());
 486
 487 static int property_get_rtc_time(
 488                 sd_bus *bus,
 489                 const char *path,
 490                 const char *interface,
 491                 const char *property,
 492                 sd_bus_message *reply,
 493                 void *userdata,
 494                 sd_bus_error *error) {
 495
 496         struct tm tm;
 497         usec_t t;
 498         int r;
 499
 500         zero(tm);
 501         r = clock_get_hwclock(&tm);
 502         if (r == -EBUSY) {
 503                 log_warning("/dev/rtc is busy. Is somebody keeping it open continuously? That's not a good idea... Returning a bogus RTC timestamp.");
 504                 t = 0;
 505         } else if (r == -ENOENT) {
 506                 log_debug("/dev/rtc not found.");
 507                 t = 0; /* no RTC found */
 508         } else if (r < 0)
 509                 return sd_bus_error_set_errnof(error, r, "Failed to read RTC: %m");
 510         else
 511                 t = (usec_t) timegm(&tm) * USEC_PER_SEC;
 512
 513         return sd_bus_message_append(reply, "t", t);
 514 }
 515
 516 static int property_get_can_ntp(
 517                 sd_bus *bus,
 518                 const char *path,
 519                 const char *interface,
 520                 const char *property,
 521                 sd_bus_message *reply,
 522                 void *userdata,
 523                 sd_bus_error *error) {
 524
 525         Context *c = userdata;
 526         int r;
 527
 528         assert(c);
 529         assert(bus);
 530         assert(property);
 531         assert(reply);
 532         assert(error);
 533
 534         r = context_update_ntp_status(c, bus, reply);
 535         if (r < 0)
 536                 return r;
 537
 538         return sd_bus_message_append(reply, "b", context_ntp_service_exists(c) > 0);
 539 }
 540
 541 static int property_get_ntp(
 542                 sd_bus *bus,
 543                 const char *path,
 544                 const char *interface,
 545                 const char *property,
 546                 sd_bus_message *reply,
 547                 void *userdata,
 548                 sd_bus_error *error) {
 549
 550         Context *c = userdata;
 551         int r;
 552
 553         assert(c);
 554         assert(bus);
 555         assert(property);
 556         assert(reply);
 557         assert(error);
 558
 559         r = context_update_ntp_status(c, bus, reply);
 560         if (r < 0)
 561                 return r;
 562
 563         return sd_bus_message_append(reply, "b", context_ntp_service_is_active(c) > 0);
 564 }
 565
 566 static int method_set_timezone(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 567         Context *c = userdata;
 568         int interactive, r;
 569         const char *z;
 570
 571         assert(m);
 572         assert(c);
 573
 574         r = sd_bus_message_read(m, "sb", &z, &interactive);
 575         if (r < 0)
 576                 return r;
 577
 578         if (!timezone_is_valid(z, LOG_DEBUG))
 579                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid time zone '%s'", z);
 580
 581         if (streq_ptr(z, c->zone))
 582                 return sd_bus_reply_method_return(m, NULL);
 583
 584         r = bus_verify_polkit_async(
 585                         m,
 586                         CAP_SYS_TIME,
 587                         "org.freedesktop.timedate1.set-timezone",
 588                         NULL,
 589                         interactive,
 590                         UID_INVALID,
 591                         &c->polkit_registry,
 592                         error);
 593         if (r < 0)
 594                 return r;
 595         if (r == 0)
 596                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 597
 598         r = free_and_strdup(&c->zone, z);
 599         if (r < 0)
 600                 return r;
 601
 602         /* 1. Write new configuration file */
 603         r = context_write_data_timezone(c);
 604         if (r < 0) {
 605                 log_error_errno(r, "Failed to set time zone: %m");
 606                 return sd_bus_error_set_errnof(error, r, "Failed to set time zone: %m");
 607         }
 608
 609         /* 2. Make glibc notice the new timezone */
 610         tzset();
 611
 612         /* 3. Tell the kernel our timezone */
 613         r = clock_set_timezone(NULL);
 614         if (r < 0)
 615                 log_debug_errno(r, "Failed to tell kernel about timezone, ignoring: %m");
 616
 617         if (c->local_rtc) {
 618                 struct timespec ts;
 619                 struct tm tm;
 620
 621                 /* 4. Sync RTC from system clock, with the new delta */
 622                 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
 623                 assert_se(localtime_r(&ts.tv_sec, &tm));
 624
 625                 r = clock_set_hwclock(&tm);
 626                 if (r < 0)
 627                         log_debug_errno(r, "Failed to sync time to hardware clock, ignoring: %m");
 628         }
 629
 630         log_struct(LOG_INFO,
 631                    "MESSAGE_ID=" SD_MESSAGE_TIMEZONE_CHANGE_STR,
 632                    "TIMEZONE=%s", c->zone,
 633                    "TIMEZONE_SHORTNAME=%s", tzname[daylight],
 634                    "DAYLIGHT=%i", daylight,
 635                    LOG_MESSAGE("Changed time zone to '%s' (%s).", c->zone, tzname[daylight]));
 636
 637         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "Timezone", NULL);
 638
 639         return sd_bus_reply_method_return(m, NULL);
 640 }
 641
 642 static int method_set_local_rtc(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 643         int lrtc, fix_system, interactive;
 644         Context *c = userdata;
 645         struct timespec ts;
 646         int r;
 647
 648         assert(m);
 649         assert(c);
 650
 651         r = sd_bus_message_read(m, "bbb", &lrtc, &fix_system, &interactive);
 652         if (r < 0)
 653                 return r;
 654
 655         if (lrtc == c->local_rtc)
 656                 return sd_bus_reply_method_return(m, NULL);
 657
 658         r = bus_verify_polkit_async(
 659                         m,
 660                         CAP_SYS_TIME,
 661                         "org.freedesktop.timedate1.set-local-rtc",
 662                         NULL,
 663                         interactive,
 664                         UID_INVALID,
 665                         &c->polkit_registry,
 666                         error);
 667         if (r < 0)
 668                 return r;
 669         if (r == 0)
 670                 return 1;
 671
 672         c->local_rtc = lrtc;
 673
 674         /* 1. Write new configuration file */
 675         r = context_write_data_local_rtc(c);
 676         if (r < 0) {
 677                 log_error_errno(r, "Failed to set RTC to local/UTC: %m");
 678                 return sd_bus_error_set_errnof(error, r, "Failed to set RTC to local/UTC: %m");
 679         }
 680
 681         /* 2. Tell the kernel our timezone */
 682         r = clock_set_timezone(NULL);
 683         if (r < 0)
 684                 log_debug_errno(r, "Failed to tell kernel about timezone, ignoring: %m");
 685
 686         /* 3. Synchronize clocks */
 687         assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
 688
 689         if (fix_system) {
 690                 struct tm tm;
 691
 692                 /* Sync system clock from RTC; first, initialize the timezone fields of struct tm. */
 693                 if (c->local_rtc)
 694                         localtime_r(&ts.tv_sec, &tm);
 695                 else
 696                         gmtime_r(&ts.tv_sec, &tm);
 697
 698                 /* Override the main fields of struct tm, but not the timezone fields */
 699                 r = clock_get_hwclock(&tm);
 700                 if (r < 0)
 701                         log_debug_errno(r, "Failed to get hardware clock, ignoring: %m");
 702                 else {
 703                         /* And set the system clock with this */
 704                         if (c->local_rtc)
 705                                 ts.tv_sec = mktime(&tm);
 706                         else
 707                                 ts.tv_sec = timegm(&tm);
 708
 709                         if (clock_settime(CLOCK_REALTIME, &ts) < 0)
 710                                 log_debug_errno(errno, "Failed to update system clock, ignoring: %m");
 711                 }
 712
 713         } else {
 714                 struct tm tm;
 715
 716                 /* Sync RTC from system clock */
 717                 if (c->local_rtc)
 718                         localtime_r(&ts.tv_sec, &tm);
 719                 else
 720                         gmtime_r(&ts.tv_sec, &tm);
 721
 722                 r = clock_set_hwclock(&tm);
 723                 if (r < 0)
 724                         log_debug_errno(r, "Failed to sync time to hardware clock, ignoring: %m");
 725         }
 726
 727         log_info("RTC configured to %s time.", c->local_rtc ? "local" : "UTC");
 728
 729         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "LocalRTC", NULL);
 730
 731         return sd_bus_reply_method_return(m, NULL);
 732 }
 733
 734 static int method_set_time(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 735         sd_bus *bus = sd_bus_message_get_bus(m);
 736         int relative, interactive, r;
 737         Context *c = userdata;
 738         int64_t utc;
 739         struct timespec ts;
 740         usec_t start;
 741         struct tm tm;
 742
 743         assert(m);
 744         assert(c);
 745
 746         r = context_update_ntp_status(c, bus, m);
 747         if (r < 0)
 748                 return sd_bus_error_set_errnof(error, r, "Failed to update context: %m");
 749
 750         if (context_ntp_service_is_active(c) > 0)
 751                 return sd_bus_error_set(error, BUS_ERROR_AUTOMATIC_TIME_SYNC_ENABLED, "Automatic time synchronization is enabled");
 752
 753         /* this only gets used if dbus does not provide a timestamp */
 754         start = now(CLOCK_MONOTONIC);
 755
 756         r = sd_bus_message_read(m, "xbb", &utc, &relative, &interactive);
 757         if (r < 0)
 758                 return r;
 759
 760         if (!relative && utc <= 0)
 761                 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid absolute time");
 762
 763         if (relative && utc == 0)
 764                 return sd_bus_reply_method_return(m, NULL);
 765
 766         if (relative) {
 767                 usec_t n, x;
 768
 769                 n = now(CLOCK_REALTIME);
 770                 x = n + utc;
 771
 772                 if ((utc > 0 && x < n) ||
 773                     (utc < 0 && x > n))
 774                         return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Time value overflow");
 775
 776                 timespec_store(&ts, x);
 777         } else
 778                 timespec_store(&ts, (usec_t) utc);
 779
 780         r = bus_verify_polkit_async(
 781                         m,
 782                         CAP_SYS_TIME,
 783                         "org.freedesktop.timedate1.set-time",
 784                         NULL,
 785                         interactive,
 786                         UID_INVALID,
 787                         &c->polkit_registry,
 788                         error);
 789         if (r < 0)
 790                 return r;
 791         if (r == 0)
 792                 return 1;
 793
 794         /* adjust ts for time spent in program */
 795         r = sd_bus_message_get_monotonic_usec(m, &start);
 796         /* when sd_bus_message_get_monotonic_usec() returns -ENODATA it does not modify &start */
 797         if (r < 0 && r != -ENODATA)
 798                 return r;
 799
 800         timespec_store(&ts, timespec_load(&ts) + (now(CLOCK_MONOTONIC) - start));
 801
 802         /* Set system clock */
 803         if (clock_settime(CLOCK_REALTIME, &ts) < 0) {
 804                 log_error_errno(errno, "Failed to set local time: %m");
 805                 return sd_bus_error_set_errnof(error, errno, "Failed to set local time: %m");
 806         }
 807
 808         /* Sync down to RTC */
 809         if (c->local_rtc)
 810                 localtime_r(&ts.tv_sec, &tm);
 811         else
 812                 gmtime_r(&ts.tv_sec, &tm);
 813
 814         r = clock_set_hwclock(&tm);
 815         if (r < 0)
 816                 log_debug_errno(r, "Failed to update hardware clock, ignoring: %m");
 817
 818         log_struct(LOG_INFO,
 819                    "MESSAGE_ID=" SD_MESSAGE_TIME_CHANGE_STR,
 820                    "REALTIME="USEC_FMT, timespec_load(&ts),
 821                    LOG_MESSAGE("Changed local time to %s", ctime(&ts.tv_sec)));
 822
 823         return sd_bus_reply_method_return(m, NULL);
 824 }
 825
 826 static int method_set_ntp(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 827         sd_bus *bus = sd_bus_message_get_bus(m);
 828         Context *c = userdata;
 829         UnitStatusInfo *u;
 830         int enable, interactive, q, r;
 831
 832         assert(m);
 833         assert(bus);
 834         assert(c);
 835
 836         r = sd_bus_message_read(m, "bb", &enable, &interactive);
 837         if (r < 0)
 838                 return r;
 839
 840         r = context_update_ntp_status(c, bus, m);
 841         if (r < 0)
 842                 return r;
 843
 844         if (context_ntp_service_exists(c) <= 0)
 845                 return sd_bus_error_set(error, BUS_ERROR_NO_NTP_SUPPORT, "NTP not supported");
 846
 847         r = bus_verify_polkit_async(
 848                         m,
 849                         CAP_SYS_TIME,
 850                         "org.freedesktop.timedate1.set-ntp",
 851                         NULL,
 852                         interactive,
 853                         UID_INVALID,
 854                         &c->polkit_registry,
 855                         error);
 856         if (r < 0)
 857                 return r;
 858         if (r == 0)
 859                 return 1;
 860
 861         if (!enable)
 862                 LIST_FOREACH(units, u, c->units) {
 863                         if (!streq(u->load_state, "loaded"))
 864                                 continue;
 865
 866                         q = unit_enable_or_disable(u, bus, error, enable);
 867                         if (q < 0)
 868                                 r = q;
 869
 870                         q = unit_start_or_stop(c, u, bus, error, enable);
 871                         if (q < 0)
 872                                 r = q;
 873                 }
 874
 875         else if (context_ntp_service_is_enabled(c) <= 0)
 876                 LIST_FOREACH(units, u, c->units) {
 877                         if (!streq(u->load_state, "loaded"))
 878                                 continue;
 879
 880                         r = unit_enable_or_disable(u, bus, error, enable);
 881                         if (r < 0)
 882                                 continue;
 883
 884                         r = unit_start_or_stop(c, u, bus, error, enable);
 885                         break;
 886                 }
 887
 888         else
 889                 LIST_FOREACH(units, u, c->units) {
 890                         if (!streq(u->load_state, "loaded") ||
 891                             !streq(u->unit_file_state, "enabled"))
 892                                 continue;
 893
 894                         r = unit_start_or_stop(c, u, bus, error, enable);
 895                         break;
 896                 }
 897
 898         if (r < 0)
 899                 return r;
 900
 901         log_info("Set NTP to %sd", enable_disable(enable));
 902
 903         return sd_bus_reply_method_return(m, NULL);
 904 }
 905
 906 static const sd_bus_vtable timedate_vtable[] = {
 907         SD_BUS_VTABLE_START(0),
 908         SD_BUS_PROPERTY("Timezone", "s", NULL, offsetof(Context, zone), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 909         SD_BUS_PROPERTY("LocalRTC", "b", bus_property_get_bool, offsetof(Context, local_rtc), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 910         SD_BUS_PROPERTY("CanNTP", "b", property_get_can_ntp, 0, 0),
 911         SD_BUS_PROPERTY("NTP", "b", property_get_ntp, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 912         SD_BUS_PROPERTY("NTPSynchronized", "b", property_get_ntp_sync, 0, 0),
 913         SD_BUS_PROPERTY("TimeUSec", "t", property_get_time, 0, 0),
 914         SD_BUS_PROPERTY("RTCTimeUSec", "t", property_get_rtc_time, 0, 0),
 915         SD_BUS_METHOD("SetTime", "xbb", NULL, method_set_time, SD_BUS_VTABLE_UNPRIVILEGED),
 916         SD_BUS_METHOD("SetTimezone", "sb", NULL, method_set_timezone, SD_BUS_VTABLE_UNPRIVILEGED),
 917         SD_BUS_METHOD("SetLocalRTC", "bbb", NULL, method_set_local_rtc, SD_BUS_VTABLE_UNPRIVILEGED),
 918         SD_BUS_METHOD("SetNTP", "bb", NULL, method_set_ntp, SD_BUS_VTABLE_UNPRIVILEGED),
 919         SD_BUS_VTABLE_END,
 920 };
 921
 922 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
 923         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 924         int r;
 925
 926         assert(c);
 927         assert(event);
 928         assert(_bus);
 929
 930         r = sd_bus_default_system(&bus);
 931         if (r < 0)
 932                 return log_error_errno(r, "Failed to get system bus connection: %m");
 933
 934         r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", timedate_vtable, c);
 935         if (r < 0)
 936                 return log_error_errno(r, "Failed to register object: %m");
 937
 938         r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.timedate1", 0, NULL, NULL);
 939         if (r < 0)
 940                 return log_error_errno(r, "Failed to request name: %m");
 941
 942         r = sd_bus_attach_event(bus, event, 0);
 943         if (r < 0)
 944                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 945
 946         *_bus = TAKE_PTR(bus);
 947
 948         return 0;
 949 }
 950
 951 int main(int argc, char *argv[]) {
 952         Context context = {};
 953         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 954         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 955         int r;
 956
 957         log_set_target(LOG_TARGET_AUTO);
 958         log_parse_environment();
 959         log_open();
 960
 961         umask(0022);
 962
 963         if (argc != 1) {
 964                 log_error("This program takes no arguments.");
 965                 r = -EINVAL;
 966                 goto finish;
 967         }
 968
 969         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 970
 971         r = sd_event_default(&event);
 972         if (r < 0) {
 973                 log_error_errno(r, "Failed to allocate event loop: %m");
 974                 goto finish;
 975         }
 976
 977         (void) sd_event_set_watchdog(event, true);
 978
 979         r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
 980         if (r < 0)
 981                 return r;
 982
 983         r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
 984         if (r < 0)
 985                 return r;
 986
 987         r = connect_bus(&context, event, &bus);
 988         if (r < 0)
 989                 goto finish;
 990
 991         (void) sd_bus_negotiate_timestamp(bus, true);
 992
 993         r = context_read_data(&context);
 994         if (r < 0) {
 995                 log_error_errno(r, "Failed to read time zone data: %m");
 996                 goto finish;
 997         }
 998
 999         r = context_parse_ntp_services(&context);
1000         if (r < 0)
1001                 goto finish;
1002
1003         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.timedate1", DEFAULT_EXIT_USEC, NULL, NULL);
1004         if (r < 0) {
1005                 log_error_errno(r, "Failed to run event loop: %m");
1006                 goto finish;
1007         }
1008
1009 finish:
1010         context_free(&context);
1011
1012         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
1013 }