src/timedate/timedated.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <errno.h>
   4 #include <sys/stat.h>
   5 #include <sys/timex.h>
   6 #include <sys/types.h>
   7 #include <unistd.h>
   8
   9 #include "sd-bus.h"
  10 #include "sd-event.h"
  11 #include "sd-messages.h"
  12
  13 #include "alloc-util.h"
  14 #include "bus-common-errors.h"
  15 #include "bus-error.h"
  16 #include "bus-get-properties.h"
  17 #include "bus-locator.h"
  18 #include "bus-log-control-api.h"
  19 #include "bus-map-properties.h"
  20 #include "bus-polkit.h"
  21 #include "clock-util.h"
  22 #include "conf-files.h"
  23 #include "def.h"
  24 #include "fd-util.h"
  25 #include "fileio-label.h"
  26 #include "fileio.h"
  27 #include "fs-util.h"
  28 #include "hashmap.h"
  29 #include "list.h"
  30 #include "main-func.h"
  31 #include "memory-util.h"
  32 #include "missing_capability.h"
  33 #include "path-util.h"
  34 #include "selinux-util.h"
  35 #include "service-util.h"
  36 #include "signal-util.h"
  37 #include "string-util.h"
  38 #include "strv.h"
  39 #include "unit-def.h"
  40 #include "unit-name.h"
  41 #include "user-util.h"
  42
  43 #define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"
  44 #define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n"
  45
  46 #define UNIT_LIST_DIRS (const char* const*) CONF_PATHS_STRV("systemd/ntp-units.d")
  47
  48 typedef struct UnitStatusInfo {
  49         char *name;
  50         char *load_state;
  51         char *unit_file_state;
  52         char *active_state;
  53         char *path;
  54
  55         LIST_FIELDS(struct UnitStatusInfo, units);
  56 } UnitStatusInfo;
  57
  58 typedef struct Context {
  59         char *zone;
  60         bool local_rtc;
  61         Hashmap *polkit_registry;
  62         sd_bus_message *cache;
  63
  64         sd_bus_slot *slot_job_removed;
  65
  66         LIST_HEAD(UnitStatusInfo, units);
  67 } Context;
  68
  69 #define log_unit_full_errno_zerook(unit, level, error, ...)             \
  70         ({                                                              \
  71                 const UnitStatusInfo *_u = (unit);                      \
  72                 _u ? log_object_internal(level, error, PROJECT_FILE, __LINE__, __func__, "UNIT=", _u->name, NULL, NULL, ##__VA_ARGS__) : \
  73                         log_internal(level, error, PROJECT_FILE, __LINE__, __func__, ##__VA_ARGS__); \
  74         })
  75
  76 #define log_unit_full_errno(unit, level, error, ...) \
  77         ({                                                              \
  78                 int _error = (error);                                   \
  79                 ASSERT_NON_ZERO(_error);                                \
  80                 log_unit_full_errno_zerook(unit, level, _error, ##__VA_ARGS__); \
  81         })
  82
  83 #define log_unit_full(unit, level, ...) (void) log_unit_full_errno_zerook(unit, level, 0, ##__VA_ARGS__)
  84
  85 #define log_unit_debug(unit, ...)   log_unit_full(unit, LOG_DEBUG, ##__VA_ARGS__)
  86 #define log_unit_info(unit, ...)    log_unit_full(unit, LOG_INFO, ##__VA_ARGS__)
  87 #define log_unit_notice(unit, ...)  log_unit_full(unit, LOG_NOTICE, ##__VA_ARGS__)
  88 #define log_unit_warning(unit, ...) log_unit_full(unit, LOG_WARNING, ##__VA_ARGS__)
  89 #define log_unit_error(unit, ...)   log_unit_full(unit, LOG_ERR, ##__VA_ARGS__)
  90
  91 #define log_unit_debug_errno(unit, error, ...)   log_unit_full_errno(unit, LOG_DEBUG, error, ##__VA_ARGS__)
  92 #define log_unit_info_errno(unit, error, ...)    log_unit_full_errno(unit, LOG_INFO, error, ##__VA_ARGS__)
  93 #define log_unit_notice_errno(unit, error, ...)  log_unit_full_errno(unit, LOG_NOTICE, error, ##__VA_ARGS__)
  94 #define log_unit_warning_errno(unit, error, ...) log_unit_full_errno(unit, LOG_WARNING, error, ##__VA_ARGS__)
  95 #define log_unit_error_errno(unit, error, ...)   log_unit_full_errno(unit, LOG_ERR, error, ##__VA_ARGS__)
  96
  97 static void unit_status_info_clear(UnitStatusInfo *p) {
  98         assert(p);
  99
 100         p->load_state = mfree(p->load_state);
 101         p->unit_file_state = mfree(p->unit_file_state);
 102         p->active_state = mfree(p->active_state);
 103 }
 104
 105 static UnitStatusInfo *unit_status_info_free(UnitStatusInfo *p) {
 106         if (!p)
 107                 return NULL;
 108
 109         unit_status_info_clear(p);
 110         free(p->name);
 111         free(p->path);
 112         return mfree(p);
 113 }
 114
 115 DEFINE_TRIVIAL_CLEANUP_FUNC(UnitStatusInfo*, unit_status_info_free);
 116
 117 static void context_clear(Context *c) {
 118         UnitStatusInfo *p;
 119
 120         assert(c);
 121
 122         free(c->zone);
 123         bus_verify_polkit_async_registry_free(c->polkit_registry);
 124         sd_bus_message_unref(c->cache);
 125
 126         sd_bus_slot_unref(c->slot_job_removed);
 127
 128         while ((p = c->units)) {
 129                 LIST_REMOVE(units, c->units, p);
 130                 unit_status_info_free(p);
 131         }
 132 }
 133
 134 static int context_add_ntp_service(Context *c, const char *s, const char *source) {
 135         _cleanup_(unit_status_info_freep) UnitStatusInfo *unit = NULL;
 136
 137         assert(c);
 138         assert(s);
 139         assert(source);
 140
 141         if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
 142                 return -EINVAL;
 143
 144         /* Do not add this if it is already listed */
 145         LIST_FOREACH(units, u, c->units)
 146                 if (streq(u->name, s))
 147                         return 0;
 148
 149         unit = new0(UnitStatusInfo, 1);
 150         if (!unit)
 151                 return -ENOMEM;
 152
 153         unit->name = strdup(s);
 154         if (!unit->name)
 155                 return -ENOMEM;
 156
 157         LIST_APPEND(units, c->units, unit);
 158         log_unit_debug(unit, "added from %s.", source);
 159         TAKE_PTR(unit);
 160
 161         return 0;
 162 }
 163
 164 static int context_parse_ntp_services_from_environment(Context *c) {
 165         const char *env, *p;
 166         int r;
 167
 168         assert(c);
 169
 170         env = getenv("SYSTEMD_TIMEDATED_NTP_SERVICES");
 171         if (!env)
 172                 return 0;
 173
 174         log_debug("Using list of ntp services from environment variable $SYSTEMD_TIMEDATED_NTP_SERVICES=%s.", env);
 175
 176         for (p = env;;) {
 177                 _cleanup_free_ char *word = NULL;
 178
 179                 r = extract_first_word(&p, &word, ":", 0);
 180                 if (r == 0)
 181                         break;
 182                 if (r == -ENOMEM)
 183                         return log_oom();
 184                 if (r < 0) {
 185                         log_error("Invalid syntax, ignoring: %s", env);
 186                         break;
 187                 }
 188
 189                 r = context_add_ntp_service(c, word, "$SYSTEMD_TIMEDATED_NTP_SERVICES");
 190                 if (r < 0)
 191                         log_warning_errno(r, "Failed to add NTP service \"%s\", ignoring: %m", word);
 192         }
 193
 194         return 1;
 195 }
 196
 197 static int context_parse_ntp_services_from_disk(Context *c) {
 198         _cleanup_strv_free_ char **files = NULL;
 199         int r;
 200
 201         r = conf_files_list_strv(&files, ".list", NULL, CONF_FILES_FILTER_MASKED, UNIT_LIST_DIRS);
 202         if (r < 0)
 203                 return log_error_errno(r, "Failed to enumerate .list files: %m");
 204
 205         STRV_FOREACH(f, files) {
 206                 _cleanup_fclose_ FILE *file = NULL;
 207
 208                 log_debug("Reading file '%s'", *f);
 209
 210                 r = fopen_unlocked(*f, "re", &file);
 211                 if (r < 0) {
 212                         log_error_errno(r, "Failed to open %s, ignoring: %m", *f);
 213                         continue;
 214                 }
 215
 216                 for (;;) {
 217                         _cleanup_free_ char *line = NULL;
 218                         const char *word;
 219
 220                         r = read_line(file, LINE_MAX, &line);
 221                         if (r < 0) {
 222                                 log_error_errno(r, "Failed to read %s, ignoring: %m", *f);
 223                                 continue;
 224                         }
 225                         if (r == 0)
 226                                 break;
 227
 228                         word = strstrip(line);
 229                         if (isempty(word) || startswith(word, "#"))
 230                                 continue;
 231
 232                         r = context_add_ntp_service(c, word, *f);
 233                         if (r < 0)
 234                                 log_warning_errno(r, "Failed to add NTP service \"%s\", ignoring: %m", word);
 235                 }
 236         }
 237
 238         return 1;
 239 }
 240
 241 static int context_parse_ntp_services(Context *c) {
 242         int r;
 243
 244         r = context_parse_ntp_services_from_environment(c);
 245         if (r != 0)
 246                 return r;
 247
 248         return context_parse_ntp_services_from_disk(c);
 249 }
 250
 251 static int context_ntp_service_is_active(Context *c) {
 252         int count = 0;
 253
 254         assert(c);
 255
 256         /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */
 257
 258         LIST_FOREACH(units, info, c->units)
 259                 count += !STRPTR_IN_SET(info->active_state, "inactive", "failed");
 260
 261         return count;
 262 }
 263
 264 static int context_ntp_service_exists(Context *c) {
 265         int count = 0;
 266
 267         assert(c);
 268
 269         /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */
 270
 271         LIST_FOREACH(units, info, c->units)
 272                 count += streq_ptr(info->load_state, "loaded");
 273
 274         return count;
 275 }
 276
 277 static int context_read_data(Context *c) {
 278         _cleanup_free_ char *t = NULL;
 279         int r;
 280
 281         assert(c);
 282
 283         r = get_timezone(&t);
 284         if (r == -EINVAL)
 285                 log_warning_errno(r, "/etc/localtime should be a symbolic link to a time zone data file in /usr/share/zoneinfo/.");
 286         else if (r < 0)
 287                 log_warning_errno(r, "Failed to get target of /etc/localtime: %m");
 288
 289         free_and_replace(c->zone, t);
 290
 291         c->local_rtc = clock_is_localtime(NULL) > 0;
 292
 293         return 0;
 294 }
 295
 296 static int context_write_data_timezone(Context *c) {
 297         _cleanup_free_ char *p = NULL;
 298         const char *source;
 299
 300         assert(c);
 301
 302         /* No timezone is very similar to UTC. Hence in either of these cases link the UTC file in. Except if
 303          * it isn't installed, in which case we remove the symlink altogether. Since glibc defaults to an
 304          * internal version of UTC in that case behaviour is mostly equivalent. We still prefer creating the
 305          * symlink though, since things are more self explanatory then. */
 306
 307         if (isempty(c->zone) || streq(c->zone, "UTC")) {
 308
 309                 if (access("/usr/share/zoneinfo/UTC", F_OK) < 0) {
 310
 311                         if (unlink("/etc/localtime") < 0 && errno != ENOENT)
 312                                 return -errno;
 313
 314                         return 0;
 315                 }
 316
 317                 source = "../usr/share/zoneinfo/UTC";
 318         } else {
 319                 p = path_join("../usr/share/zoneinfo", c->zone);
 320                 if (!p)
 321                         return -ENOMEM;
 322
 323                 source = p;
 324         }
 325
 326         return symlink_atomic(source, "/etc/localtime");
 327 }
 328
 329 static int context_write_data_local_rtc(Context *c) {
 330         _cleanup_free_ char *s = NULL, *w = NULL;
 331         int r;
 332
 333         assert(c);
 334
 335         r = read_full_file("/etc/adjtime", &s, NULL);
 336         if (r < 0) {
 337                 if (r != -ENOENT)
 338                         return r;
 339
 340                 if (!c->local_rtc)
 341                         return 0;
 342
 343                 w = strdup(NULL_ADJTIME_LOCAL);
 344                 if (!w)
 345                         return -ENOMEM;
 346         } else {
 347                 char *p;
 348                 const char *e = "\n"; /* default if there is less than 3 lines */
 349                 const char *prepend = "";
 350                 size_t a, b;
 351
 352                 p = strchrnul(s, '\n');
 353                 if (*p == '\0')
 354                         /* only one line, no \n terminator */
 355                         prepend = "\n0\n";
 356                 else if (p[1] == '\0') {
 357                         /* only one line, with \n terminator */
 358                         ++p;
 359                         prepend = "0\n";
 360                 } else {
 361                         p = strchr(p+1, '\n');
 362                         if (!p) {
 363                                 /* only two lines, no \n terminator */
 364                                 prepend = "\n";
 365                                 p = s + strlen(s);
 366                         } else {
 367                                 char *end;
 368                                 /* third line might have a \n terminator or not */
 369                                 p++;
 370                                 end = strchr(p, '\n');
 371                                 /* if we actually have a fourth line, use that as suffix "e", otherwise the default \n */
 372                                 if (end)
 373                                         e = end;
 374                         }
 375                 }
 376
 377                 a = p - s;
 378                 b = strlen(e);
 379
 380                 w = new(char, a + (c->local_rtc ? 5 : 3) + strlen(prepend) + b + 1);
 381                 if (!w)
 382                         return -ENOMEM;
 383
 384                 *(char*) mempcpy(stpcpy(stpcpy(mempcpy(w, s, a), prepend), c->local_rtc ? "LOCAL" : "UTC"), e, b) = 0;
 385
 386                 if (streq(w, NULL_ADJTIME_UTC)) {
 387                         if (unlink("/etc/adjtime") < 0)
 388                                 if (errno != ENOENT)
 389                                         return -errno;
 390
 391                         return 0;
 392                 }
 393         }
 394
 395         r = mac_selinux_init();
 396         if (r < 0)
 397                 return r;
 398
 399         return write_string_file_atomic_label("/etc/adjtime", w);
 400 }
 401
 402 static int context_update_ntp_status(Context *c, sd_bus *bus, sd_bus_message *m) {
 403         static const struct bus_properties_map map[] = {
 404                 { "LoadState",     "s", NULL, offsetof(UnitStatusInfo, load_state)      },
 405                 { "ActiveState",   "s", NULL, offsetof(UnitStatusInfo, active_state)    },
 406                 { "UnitFileState", "s", NULL, offsetof(UnitStatusInfo, unit_file_state) },
 407                 {}
 408         };
 409         int r;
 410
 411         assert(c);
 412         assert(bus);
 413
 414         /* Suppress calling context_update_ntp_status() multiple times within single DBus transaction. */
 415         if (m) {
 416                 if (m == c->cache)
 417                         return 0;
 418
 419                 sd_bus_message_unref(c->cache);
 420                 c->cache = sd_bus_message_ref(m);
 421         }
 422
 423         LIST_FOREACH(units, u, c->units) {
 424                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 425                 _cleanup_free_ char *path = NULL;
 426
 427                 unit_status_info_clear(u);
 428
 429                 path = unit_dbus_path_from_name(u->name);
 430                 if (!path)
 431                         return -ENOMEM;
 432
 433                 r = bus_map_all_properties(
 434                                 bus,
 435                                 "org.freedesktop.systemd1",
 436                                 path,
 437                                 map,
 438                                 BUS_MAP_STRDUP,
 439                                 &error,
 440                                 NULL,
 441                                 u);
 442                 if (r < 0)
 443                         return log_unit_error_errno(u, r, "Failed to get properties: %s", bus_error_message(&error, r));
 444         }
 445
 446         return 0;
 447 }
 448
 449 static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 450         Context *c = userdata;
 451         const char *path;
 452         unsigned n = 0;
 453         int r;
 454
 455         assert(c);
 456         assert(m);
 457
 458         r = sd_bus_message_read(m, "uoss", NULL, &path, NULL, NULL);
 459         if (r < 0) {
 460                 bus_log_parse_error(r);
 461                 return 0;
 462         }
 463
 464         LIST_FOREACH(units, u, c->units)
 465                 if (streq_ptr(path, u->path))
 466                         u->path = mfree(u->path);
 467                 else
 468                         n += !!u->path;
 469
 470         if (n == 0) {
 471                 c->slot_job_removed = sd_bus_slot_unref(c->slot_job_removed);
 472
 473                 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 474                                                       "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "NTP",
 475                                                       NULL);
 476         }
 477
 478         return 0;
 479 }
 480
 481 static int unit_start_or_stop(UnitStatusInfo *u, sd_bus *bus, sd_bus_error *error, bool start) {
 482         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 483         const char *path;
 484         int r;
 485
 486         assert(u);
 487         assert(bus);
 488         assert(error);
 489
 490         r = bus_call_method(
 491                 bus,
 492                 bus_systemd_mgr,
 493                 start ? "StartUnit" : "StopUnit",
 494                 error,
 495                 &reply,
 496                 "ss",
 497                 u->name,
 498                 "replace");
 499         log_unit_full_errno_zerook(u, r < 0 ? LOG_WARNING : LOG_DEBUG, r,
 500                                    "%s unit: %m", start ? "Starting" : "Stopping");
 501         if (r < 0)
 502                 return r;
 503
 504         r = sd_bus_message_read(reply, "o", &path);
 505         if (r < 0)
 506                 return bus_log_parse_error(r);
 507
 508         r = free_and_strdup(&u->path, path);
 509         if (r < 0)
 510                 return log_oom();
 511
 512         return 0;
 513 }
 514
 515 static int unit_enable_or_disable(UnitStatusInfo *u, sd_bus *bus, sd_bus_error *error, bool enable) {
 516         int r;
 517
 518         assert(u);
 519         assert(bus);
 520         assert(error);
 521
 522         /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */
 523
 524         if (streq(u->unit_file_state, "enabled") == enable) {
 525                 log_unit_debug(u, "already %sd.", enable_disable(enable));
 526                 return 0;
 527         }
 528
 529         log_unit_info(u, "%s unit.", enable ? "Enabling" : "Disabling");
 530
 531         if (enable)
 532                 r = bus_call_method(
 533                                 bus,
 534                                 bus_systemd_mgr,
 535                                 "EnableUnitFiles",
 536                                 error,
 537                                 NULL,
 538                                 "asbb", 1,
 539                                 u->name,
 540                                 false, true);
 541         else
 542                 r = bus_call_method(
 543                                 bus,
 544                                 bus_systemd_mgr,
 545                                 "DisableUnitFiles",
 546                                 error,
 547                                 NULL,
 548                                 "asb", 1,
 549                                 u->name,
 550                                 false);
 551         if (r < 0)
 552                 return r;
 553
 554         r = bus_call_method(bus, bus_systemd_mgr, "Reload", error, NULL, NULL);
 555         if (r < 0)
 556                 return r;
 557
 558         return 0;
 559 }
 560
 561 static bool ntp_synced(void) {
 562         struct timex txc = {};
 563
 564         if (adjtimex(&txc) < 0)
 565                 return false;
 566
 567         /* Consider the system clock synchronized if the reported maximum error is smaller than the maximum
 568          * value (16 seconds). Ignore the STA_UNSYNC flag as it may have been set to prevent the kernel from
 569          * touching the RTC. */
 570         return txc.maxerror < 16000000;
 571 }
 572
 573 static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_time, "t", now(CLOCK_REALTIME));
 574 static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_ntp_sync, "b", ntp_synced());
 575
 576 static int property_get_rtc_time(
 577                 sd_bus *bus,
 578                 const char *path,
 579                 const char *interface,
 580                 const char *property,
 581                 sd_bus_message *reply,
 582                 void *userdata,
 583                 sd_bus_error *error) {
 584
 585         struct tm tm = {};
 586         usec_t t = 0;
 587         int r;
 588
 589         r = clock_get_hwclock(&tm);
 590         if (r == -EBUSY)
 591                 log_warning("/dev/rtc is busy. Is somebody keeping it open continuously? That's not a good idea... Returning a bogus RTC timestamp.");
 592         else if (r == -ENOENT)
 593                 log_debug("/dev/rtc not found.");
 594         else if (r < 0)
 595                 return sd_bus_error_set_errnof(error, r, "Failed to read RTC: %m");
 596         else
 597                 t = (usec_t) timegm(&tm) * USEC_PER_SEC;
 598
 599         return sd_bus_message_append(reply, "t", t);
 600 }
 601
 602 static int property_get_can_ntp(
 603                 sd_bus *bus,
 604                 const char *path,
 605                 const char *interface,
 606                 const char *property,
 607                 sd_bus_message *reply,
 608                 void *userdata,
 609                 sd_bus_error *error) {
 610
 611         Context *c = userdata;
 612         int r;
 613
 614         assert(c);
 615         assert(bus);
 616         assert(property);
 617         assert(reply);
 618         assert(error);
 619
 620         if (c->slot_job_removed)
 621                 /* When the previous request is not finished, then assume NTP is enabled. */
 622                 return sd_bus_message_append(reply, "b", true);
 623
 624         r = context_update_ntp_status(c, bus, reply);
 625         if (r < 0)
 626                 return r;
 627
 628         return sd_bus_message_append(reply, "b", context_ntp_service_exists(c) > 0);
 629 }
 630
 631 static int property_get_ntp(
 632                 sd_bus *bus,
 633                 const char *path,
 634                 const char *interface,
 635                 const char *property,
 636                 sd_bus_message *reply,
 637                 void *userdata,
 638                 sd_bus_error *error) {
 639
 640         Context *c = userdata;
 641         int r;
 642
 643         assert(c);
 644         assert(bus);
 645         assert(property);
 646         assert(reply);
 647         assert(error);
 648
 649         if (c->slot_job_removed)
 650                 /* When the previous request is not finished, then assume NTP is active. */
 651                 return sd_bus_message_append(reply, "b", true);
 652
 653         r = context_update_ntp_status(c, bus, reply);
 654         if (r < 0)
 655                 return r;
 656
 657         return sd_bus_message_append(reply, "b", context_ntp_service_is_active(c) > 0);
 658 }
 659
 660 static int method_set_timezone(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 661         Context *c = userdata;
 662         int interactive, r;
 663         const char *z;
 664
 665         assert(m);
 666         assert(c);
 667
 668         r = sd_bus_message_read(m, "sb", &z, &interactive);
 669         if (r < 0)
 670                 return r;
 671
 672         if (!timezone_is_valid(z, LOG_DEBUG))
 673                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid or not installed time zone '%s'", z);
 674
 675         if (streq_ptr(z, c->zone))
 676                 return sd_bus_reply_method_return(m, NULL);
 677
 678         r = bus_verify_polkit_async(
 679                         m,
 680                         CAP_SYS_TIME,
 681                         "org.freedesktop.timedate1.set-timezone",
 682                         NULL,
 683                         interactive,
 684                         UID_INVALID,
 685                         &c->polkit_registry,
 686                         error);
 687         if (r < 0)
 688                 return r;
 689         if (r == 0)
 690                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 691
 692         r = free_and_strdup(&c->zone, z);
 693         if (r < 0)
 694                 return r;
 695
 696         /* 1. Write new configuration file */
 697         r = context_write_data_timezone(c);
 698         if (r < 0) {
 699                 log_error_errno(r, "Failed to set time zone: %m");
 700                 return sd_bus_error_set_errnof(error, r, "Failed to set time zone: %m");
 701         }
 702
 703         /* 2. Make glibc notice the new timezone */
 704         tzset();
 705
 706         /* 3. Tell the kernel our timezone */
 707         r = clock_set_timezone(NULL);
 708         if (r < 0)
 709                 log_debug_errno(r, "Failed to tell kernel about timezone, ignoring: %m");
 710
 711         if (c->local_rtc) {
 712                 struct timespec ts;
 713                 struct tm tm;
 714
 715                 /* 4. Sync RTC from system clock, with the new delta */
 716                 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
 717                 assert_se(localtime_r(&ts.tv_sec, &tm));
 718
 719                 r = clock_set_hwclock(&tm);
 720                 if (r < 0)
 721                         log_debug_errno(r, "Failed to sync time to hardware clock, ignoring: %m");
 722         }
 723
 724         log_struct(LOG_INFO,
 725                    "MESSAGE_ID=" SD_MESSAGE_TIMEZONE_CHANGE_STR,
 726                    "TIMEZONE=%s", c->zone,
 727                    "TIMEZONE_SHORTNAME=%s", tzname[daylight],
 728                    "DAYLIGHT=%i", daylight,
 729                    LOG_MESSAGE("Changed time zone to '%s' (%s).", c->zone, tzname[daylight]));
 730
 731         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 732                                               "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "Timezone",
 733                                               NULL);
 734
 735         return sd_bus_reply_method_return(m, NULL);
 736 }
 737
 738 static int method_set_local_rtc(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 739         int lrtc, fix_system, interactive;
 740         Context *c = userdata;
 741         struct timespec ts;
 742         int r;
 743
 744         assert(m);
 745         assert(c);
 746
 747         r = sd_bus_message_read(m, "bbb", &lrtc, &fix_system, &interactive);
 748         if (r < 0)
 749                 return r;
 750
 751         if (lrtc == c->local_rtc && !fix_system)
 752                 return sd_bus_reply_method_return(m, NULL);
 753
 754         r = bus_verify_polkit_async(
 755                         m,
 756                         CAP_SYS_TIME,
 757                         "org.freedesktop.timedate1.set-local-rtc",
 758                         NULL,
 759                         interactive,
 760                         UID_INVALID,
 761                         &c->polkit_registry,
 762                         error);
 763         if (r < 0)
 764                 return r;
 765         if (r == 0)
 766                 return 1;
 767
 768         if (lrtc != c->local_rtc) {
 769                 c->local_rtc = lrtc;
 770
 771                 /* 1. Write new configuration file */
 772                 r = context_write_data_local_rtc(c);
 773                 if (r < 0) {
 774                         log_error_errno(r, "Failed to set RTC to %s: %m", lrtc ? "local" : "UTC");
 775                         return sd_bus_error_set_errnof(error, r, "Failed to set RTC to %s: %m", lrtc ? "local" : "UTC");
 776                 }
 777         }
 778
 779         /* 2. Tell the kernel our timezone */
 780         r = clock_set_timezone(NULL);
 781         if (r < 0)
 782                 log_debug_errno(r, "Failed to tell kernel about timezone, ignoring: %m");
 783
 784         /* 3. Synchronize clocks */
 785         assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
 786
 787         if (fix_system) {
 788                 struct tm tm;
 789
 790                 /* Sync system clock from RTC; first, initialize the timezone fields of struct tm. */
 791                 localtime_or_gmtime_r(&ts.tv_sec, &tm, !c->local_rtc);
 792
 793                 /* Override the main fields of struct tm, but not the timezone fields */
 794                 r = clock_get_hwclock(&tm);
 795                 if (r < 0)
 796                         log_debug_errno(r, "Failed to get hardware clock, ignoring: %m");
 797                 else {
 798                         /* And set the system clock with this */
 799                         ts.tv_sec = mktime_or_timegm(&tm, !c->local_rtc);
 800
 801                         if (clock_settime(CLOCK_REALTIME, &ts) < 0)
 802                                 log_debug_errno(errno, "Failed to update system clock, ignoring: %m");
 803                 }
 804
 805         } else {
 806                 struct tm tm;
 807
 808                 /* Sync RTC from system clock */
 809                 localtime_or_gmtime_r(&ts.tv_sec, &tm, !c->local_rtc);
 810
 811                 r = clock_set_hwclock(&tm);
 812                 if (r < 0)
 813                         log_debug_errno(r, "Failed to sync time to hardware clock, ignoring: %m");
 814         }
 815
 816         log_info("RTC configured to %s time.", c->local_rtc ? "local" : "UTC");
 817
 818         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 819                                               "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "LocalRTC",
 820                                               NULL);
 821
 822         return sd_bus_reply_method_return(m, NULL);
 823 }
 824
 825 static int method_set_time(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 826         sd_bus *bus = sd_bus_message_get_bus(m);
 827         char buf[FORMAT_TIMESTAMP_MAX];
 828         int relative, interactive, r;
 829         Context *c = userdata;
 830         int64_t utc;
 831         struct timespec ts;
 832         usec_t start;
 833         struct tm tm;
 834
 835         assert(m);
 836         assert(c);
 837
 838         if (c->slot_job_removed)
 839                 return sd_bus_error_set(error, BUS_ERROR_AUTOMATIC_TIME_SYNC_ENABLED, "Previous request is not finished, refusing.");
 840
 841         r = context_update_ntp_status(c, bus, m);
 842         if (r < 0)
 843                 return sd_bus_error_set_errnof(error, r, "Failed to update context: %m");
 844
 845         if (context_ntp_service_is_active(c) > 0)
 846                 return sd_bus_error_set(error, BUS_ERROR_AUTOMATIC_TIME_SYNC_ENABLED, "Automatic time synchronization is enabled");
 847
 848         /* this only gets used if dbus does not provide a timestamp */
 849         start = now(CLOCK_MONOTONIC);
 850
 851         r = sd_bus_message_read(m, "xbb", &utc, &relative, &interactive);
 852         if (r < 0)
 853                 return r;
 854
 855         if (!relative && utc <= 0)
 856                 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid absolute time");
 857
 858         if (relative && utc == 0)
 859                 return sd_bus_reply_method_return(m, NULL);
 860
 861         if (relative) {
 862                 usec_t n, x;
 863
 864                 n = now(CLOCK_REALTIME);
 865                 x = n + utc;
 866
 867                 if ((utc > 0 && x < n) ||
 868                     (utc < 0 && x > n))
 869                         return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Time value overflow");
 870
 871                 timespec_store(&ts, x);
 872         } else
 873                 timespec_store(&ts, (usec_t) utc);
 874
 875         r = bus_verify_polkit_async(
 876                         m,
 877                         CAP_SYS_TIME,
 878                         "org.freedesktop.timedate1.set-time",
 879                         NULL,
 880                         interactive,
 881                         UID_INVALID,
 882                         &c->polkit_registry,
 883                         error);
 884         if (r < 0)
 885                 return r;
 886         if (r == 0)
 887                 return 1;
 888
 889         /* adjust ts for time spent in program */
 890         r = sd_bus_message_get_monotonic_usec(m, &start);
 891         /* when sd_bus_message_get_monotonic_usec() returns -ENODATA it does not modify &start */
 892         if (r < 0 && r != -ENODATA)
 893                 return r;
 894
 895         timespec_store(&ts, timespec_load(&ts) + (now(CLOCK_MONOTONIC) - start));
 896
 897         /* Set system clock */
 898         if (clock_settime(CLOCK_REALTIME, &ts) < 0) {
 899                 log_error_errno(errno, "Failed to set local time: %m");
 900                 return sd_bus_error_set_errnof(error, errno, "Failed to set local time: %m");
 901         }
 902
 903         /* Sync down to RTC */
 904         localtime_or_gmtime_r(&ts.tv_sec, &tm, !c->local_rtc);
 905
 906         r = clock_set_hwclock(&tm);
 907         if (r < 0)
 908                 log_debug_errno(r, "Failed to update hardware clock, ignoring: %m");
 909
 910         log_struct(LOG_INFO,
 911                    "MESSAGE_ID=" SD_MESSAGE_TIME_CHANGE_STR,
 912                    "REALTIME="USEC_FMT, timespec_load(&ts),
 913                    LOG_MESSAGE("Changed local time to %s", strnull(format_timestamp(buf, sizeof(buf), timespec_load(&ts)))));
 914
 915         return sd_bus_reply_method_return(m, NULL);
 916 }
 917
 918 static int method_set_ntp(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 919         _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *slot = NULL;
 920         sd_bus *bus = sd_bus_message_get_bus(m);
 921         Context *c = userdata;
 922         const UnitStatusInfo *selected = NULL;
 923         int enable, interactive, q, r;
 924
 925         assert(m);
 926         assert(bus);
 927         assert(c);
 928
 929         r = sd_bus_message_read(m, "bb", &enable, &interactive);
 930         if (r < 0)
 931                 return r;
 932
 933         r = context_update_ntp_status(c, bus, m);
 934         if (r < 0)
 935                 return r;
 936
 937         if (context_ntp_service_exists(c) <= 0)
 938                 return sd_bus_error_set(error, BUS_ERROR_NO_NTP_SUPPORT, "NTP not supported");
 939
 940         r = bus_verify_polkit_async(
 941                         m,
 942                         CAP_SYS_TIME,
 943                         "org.freedesktop.timedate1.set-ntp",
 944                         NULL,
 945                         interactive,
 946                         UID_INVALID,
 947                         &c->polkit_registry,
 948                         error);
 949         if (r < 0)
 950                 return r;
 951         if (r == 0)
 952                 return 1;
 953
 954         /* This method may be called frequently. Forget the previous job if it has not completed yet. */
 955         LIST_FOREACH(units, u, c->units)
 956                 u->path = mfree(u->path);
 957
 958         if (!c->slot_job_removed) {
 959                 r = bus_match_signal_async(
 960                                 bus,
 961                                 &slot,
 962                                 bus_systemd_mgr,
 963                                 "JobRemoved",
 964                                 match_job_removed, NULL, c);
 965                 if (r < 0)
 966                         return r;
 967         }
 968
 969         if (enable)
 970                 LIST_FOREACH(units, u, c->units) {
 971                         bool enable_this_one = !selected;
 972
 973                         if (!streq(u->load_state, "loaded"))
 974                                 continue;
 975
 976                         r = unit_enable_or_disable(u, bus, error, enable_this_one);
 977                         if (r < 0)
 978                                 /* If enablement failed, don't start this unit. */
 979                                 enable_this_one = false;
 980
 981                         r = unit_start_or_stop(u, bus, error, enable_this_one);
 982                         if (r < 0)
 983                                 log_unit_warning_errno(u, r, "Failed to %s %sd NTP unit, ignoring: %m",
 984                                                        enable_this_one ? "start" : "stop",
 985                                                        enable_disable(enable_this_one));
 986                         if (enable_this_one)
 987                                 selected = u;
 988                 }
 989         else
 990                 LIST_FOREACH(units, u, c->units) {
 991                         if (!streq(u->load_state, "loaded"))
 992                                 continue;
 993
 994                         q = unit_enable_or_disable(u, bus, error, false);
 995                         if (q < 0)
 996                                 r = q;
 997
 998                         q = unit_start_or_stop(u, bus, error, false);
 999                         if (q < 0)
1000                                 r = q;
1001                 }
1002
1003         if (r < 0)
1004                 return r;
1005         if (enable && !selected)
1006                 return log_error_errno(SYNTHETIC_ERRNO(ENOENT), "No NTP service found to enable.");
1007
1008         if (slot)
1009                 c->slot_job_removed = TAKE_PTR(slot);
1010
1011         if (selected)
1012                 log_info("Set NTP to enabled (%s).", selected->name);
1013         else
1014                 log_info("Set NTP to disabled.");
1015
1016         return sd_bus_reply_method_return(m, NULL);
1017 }
1018
1019 static int method_list_timezones(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1020         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1021         _cleanup_strv_free_ char **zones = NULL;
1022         int r;
1023
1024         assert(m);
1025
1026         r = get_timezones(&zones);
1027         if (r < 0)
1028                 return sd_bus_error_set_errnof(error, r, "Failed to read list of time zones: %m");
1029
1030         r = sd_bus_message_new_method_return(m, &reply);
1031         if (r < 0)
1032                 return r;
1033
1034         r = sd_bus_message_append_strv(reply, zones);
1035         if (r < 0)
1036                 return r;
1037
1038         return sd_bus_send(NULL, reply, NULL);
1039 }
1040
1041 static const sd_bus_vtable timedate_vtable[] = {
1042         SD_BUS_VTABLE_START(0),
1043
1044         SD_BUS_PROPERTY("Timezone", "s", NULL, offsetof(Context, zone), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1045         SD_BUS_PROPERTY("LocalRTC", "b", bus_property_get_bool, offsetof(Context, local_rtc), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1046         SD_BUS_PROPERTY("CanNTP", "b", property_get_can_ntp, 0, 0),
1047         SD_BUS_PROPERTY("NTP", "b", property_get_ntp, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1048         SD_BUS_PROPERTY("NTPSynchronized", "b", property_get_ntp_sync, 0, 0),
1049         SD_BUS_PROPERTY("TimeUSec", "t", property_get_time, 0, 0),
1050         SD_BUS_PROPERTY("RTCTimeUSec", "t", property_get_rtc_time, 0, 0),
1051
1052         SD_BUS_METHOD_WITH_ARGS("SetTime",
1053                                 SD_BUS_ARGS("x", usec_utc, "b", relative, "b", interactive),
1054                                 SD_BUS_NO_RESULT,
1055                                 method_set_time,
1056                                 SD_BUS_VTABLE_UNPRIVILEGED),
1057         SD_BUS_METHOD_WITH_ARGS("SetTimezone",
1058                                 SD_BUS_ARGS("s", timezone, "b", interactive),
1059                                 SD_BUS_NO_RESULT,
1060                                 method_set_timezone,
1061                                 SD_BUS_VTABLE_UNPRIVILEGED),
1062         SD_BUS_METHOD_WITH_ARGS("SetLocalRTC",
1063                                 SD_BUS_ARGS("b", local_rtc, "b", fix_system, "b", interactive),
1064                                 SD_BUS_NO_RESULT,
1065                                 method_set_local_rtc,
1066                                 SD_BUS_VTABLE_UNPRIVILEGED),
1067         SD_BUS_METHOD_WITH_ARGS("SetNTP",
1068                                 SD_BUS_ARGS("b", use_ntp, "b", interactive),
1069                                 SD_BUS_NO_RESULT,
1070                                 method_set_ntp,
1071                                 SD_BUS_VTABLE_UNPRIVILEGED),
1072         SD_BUS_METHOD_WITH_ARGS("ListTimezones",
1073                                 SD_BUS_NO_ARGS,
1074                                 SD_BUS_RESULT("as", timezones),
1075                                 method_list_timezones,
1076                                 SD_BUS_VTABLE_UNPRIVILEGED),
1077
1078         SD_BUS_VTABLE_END,
1079 };
1080
1081 const BusObjectImplementation manager_object = {
1082         "/org/freedesktop/timedate1",
1083         "org.freedesktop.timedate1",
1084         .vtables = BUS_VTABLES(timedate_vtable),
1085 };
1086
1087 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
1088         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1089         int r;
1090
1091         assert(c);
1092         assert(event);
1093         assert(_bus);
1094
1095         r = sd_bus_default_system(&bus);
1096         if (r < 0)
1097                 return log_error_errno(r, "Failed to get system bus connection: %m");
1098
1099         r = bus_add_implementation(bus, &manager_object, c);
1100         if (r < 0)
1101                 return r;
1102
1103         r = bus_log_control_api_register(bus);
1104         if (r < 0)
1105                 return r;
1106
1107         r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.timedate1", 0, NULL, NULL);
1108         if (r < 0)
1109                 return log_error_errno(r, "Failed to request name: %m");
1110
1111         r = sd_bus_attach_event(bus, event, 0);
1112         if (r < 0)
1113                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
1114
1115         *_bus = TAKE_PTR(bus);
1116
1117         return 0;
1118 }
1119
1120 static int run(int argc, char *argv[]) {
1121         _cleanup_(context_clear) Context context = {};
1122         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
1123         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1124         int r;
1125
1126         log_setup();
1127
1128         r = service_parse_argv("systemd-timedated.service",
1129                                "Manage the system clock and timezone and NTP enablement.",
1130                                BUS_IMPLEMENTATIONS(&manager_object,
1131                                                    &log_control_object),
1132                                argc, argv);
1133         if (r <= 0)
1134                 return r;
1135
1136         umask(0022);
1137
1138         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
1139
1140         r = sd_event_default(&event);
1141         if (r < 0)
1142                 return log_error_errno(r, "Failed to allocate event loop: %m");
1143
1144         (void) sd_event_set_watchdog(event, true);
1145
1146         r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
1147         if (r < 0)
1148                 return log_error_errno(r, "Failed to install SIGINT handler: %m");
1149
1150         r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
1151         if (r < 0)
1152                 return log_error_errno(r, "Failed to install SIGTERM handler: %m");
1153
1154         r = connect_bus(&context, event, &bus);
1155         if (r < 0)
1156                 return r;
1157
1158         (void) sd_bus_negotiate_timestamp(bus, true);
1159
1160         r = context_read_data(&context);
1161         if (r < 0)
1162                 return log_error_errno(r, "Failed to read time zone data: %m");
1163
1164         r = context_parse_ntp_services(&context);
1165         if (r < 0)
1166                 return r;
1167
1168         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.timedate1", DEFAULT_EXIT_USEC, NULL, NULL);
1169         if (r < 0)
1170                 return log_error_errno(r, "Failed to run event loop: %m");
1171
1172         return 0;
1173 }
1174
1175 DEFINE_MAIN_FUNCTION(run);