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