1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include "sd-messages.h"
35 #include "conf-files.h"
36 #include "path-util.h"
37 #include "fileio-label.h"
40 #include "event-util.h"
42 #define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"
43 #define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n"
45 typedef struct Context {
50 Hashmap *polkit_registry;
53 static void context_reset(Context *c) {
60 c->can_ntp = c->use_ntp = -1;
63 static void context_free(Context *c, sd_bus *bus) {
67 bus_verify_polkit_async_registry_free(bus, c->polkit_registry);
70 static bool valid_timezone(const char *name) {
79 if (*name == '/' || *name == 0)
82 for (p = name; *p; p++) {
83 if (!(*p >= '0' && *p <= '9') &&
84 !(*p >= 'a' && *p <= 'z') &&
85 !(*p >= 'A' && *p <= 'Z') &&
86 !(*p == '-' || *p == '_' || *p == '+' || *p == '/'))
102 t = strappend("/usr/share/zoneinfo/", name);
112 if (!S_ISREG(st.st_mode))
118 static int context_read_data(Context *c) {
119 _cleanup_free_ char *t = NULL;
126 r = readlink_malloc("/etc/localtime", &t);
129 log_warning("/etc/localtime should be a symbolic link to a timezone data file in /usr/share/zoneinfo/.");
131 log_warning("Failed to get target of /etc/localtime: %s", strerror(-r));
135 e = path_startswith(t, "/usr/share/zoneinfo/");
137 e = path_startswith(t, "../usr/share/zoneinfo/");
140 log_warning("/etc/localtime should be a symbolic link to a timezone data file in /usr/share/zoneinfo/.");
151 if (isempty(c->zone)) {
156 c->local_rtc = hwclock_is_localtime() > 0;
161 static int context_write_data_timezone(Context *c) {
162 _cleanup_free_ char *p = NULL;
167 if (isempty(c->zone)) {
168 if (unlink("/etc/localtime") < 0 && errno != ENOENT)
174 p = strappend("../usr/share/zoneinfo/", c->zone);
178 r = symlink_atomic(p, "/etc/localtime");
185 static int context_write_data_local_rtc(Context *c) {
187 _cleanup_free_ char *s = NULL, *w = NULL;
191 r = read_full_file("/etc/adjtime", &s, NULL);
199 w = strdup(NULL_ADJTIME_LOCAL);
210 p = strchr(p+1, '\n');
222 w = new(char, a + (c->local_rtc ? 5 : 3) + b + 1);
226 *(char*) mempcpy(stpcpy(mempcpy(w, s, a), c->local_rtc ? "LOCAL" : "UTC"), e, b) = 0;
228 if (streq(w, NULL_ADJTIME_UTC)) {
229 if (unlink("/etc/adjtime") < 0)
238 return write_string_file_atomic_label("/etc/adjtime", w);
241 static char** get_ntp_services(void) {
242 _cleanup_strv_free_ char **r = NULL, **files = NULL;
246 k = conf_files_list(&files, ".list", NULL,
247 "/etc/systemd/ntp-units.d",
248 "/run/systemd/ntp-units.d",
249 "/usr/local/lib/systemd/ntp-units.d",
250 "/usr/lib/systemd/ntp-units.d",
255 STRV_FOREACH(i, files) {
256 _cleanup_fclose_ FILE *f;
263 char line[PATH_MAX], *l;
265 if (!fgets(line, sizeof(line), f)) {
268 log_error("Failed to read NTP units file: %m");
274 if (l[0] == 0 || l[0] == '#')
277 if (strv_extend(&r, l) < 0) {
285 r = NULL; /* avoid cleanup */
290 static int context_read_ntp(Context *c, sd_bus *bus) {
291 _cleanup_strv_free_ char **l;
298 l = get_ntp_services();
300 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
301 sd_bus_message *reply = NULL;
304 r = sd_bus_call_method(
306 "org.freedesktop.systemd1",
307 "/org/freedesktop/systemd1",
308 "org.freedesktop.systemd1.Manager",
316 /* This implementation does not exist, try next one */
317 if (sd_bus_error_has_name(&error, SD_BUS_ERROR_FILE_NOT_FOUND))
323 r = sd_bus_message_read(reply, "s", &s);
329 streq(s, "enabled") ||
330 streq(s, "enabled-runtime");
335 /* NTP is not installed. */
342 static int context_start_ntp(Context *c, sd_bus *bus, sd_bus_error *error) {
343 _cleanup_strv_free_ char **l = NULL;
351 l = get_ntp_services();
355 r = sd_bus_call_method(
357 "org.freedesktop.systemd1",
358 "/org/freedesktop/systemd1",
359 "org.freedesktop.systemd1.Manager",
363 "ss", *i, "replace");
365 r = sd_bus_call_method(
367 "org.freedesktop.systemd1",
368 "/org/freedesktop/systemd1",
369 "org.freedesktop.systemd1.Manager",
373 "ss", *i, "replace");
376 if (sd_bus_error_has_name(error, SD_BUS_ERROR_FILE_NOT_FOUND) ||
377 sd_bus_error_has_name(error, "org.freedesktop.systemd1.LoadFailed") ||
378 sd_bus_error_has_name(error, "org.freedesktop.systemd1.NoSuchUnit")) {
379 /* This implementation does not exist, try next one */
380 sd_bus_error_free(error);
390 sd_bus_error_set_const(error, "org.freedesktop.timedate1.NoNTPSupport", "NTP not supported.");
394 static int context_enable_ntp(Context*c, sd_bus *bus, sd_bus_error *error) {
395 _cleanup_strv_free_ char **l = NULL;
403 l = get_ntp_services();
406 r = sd_bus_call_method(
408 "org.freedesktop.systemd1",
409 "/org/freedesktop/systemd1",
410 "org.freedesktop.systemd1.Manager",
414 "asbb", 1, *i, false, true);
416 r = sd_bus_call_method(
418 "org.freedesktop.systemd1",
419 "/org/freedesktop/systemd1",
420 "org.freedesktop.systemd1.Manager",
424 "asb", 1, *i, false);
427 if (sd_bus_error_has_name(error, SD_BUS_ERROR_FILE_NOT_FOUND)) {
428 /* This implementation does not exist, try next one */
429 sd_bus_error_free(error);
436 r = sd_bus_call_method(
438 "org.freedesktop.systemd1",
439 "/org/freedesktop/systemd1",
440 "org.freedesktop.systemd1.Manager",
451 sd_bus_error_set_const(error, "org.freedesktop.timedate1.NoNTPSupport", "NTP not supported.");
455 static int property_get_rtc_time(
458 const char *interface,
459 const char *property,
460 sd_bus_message *reply,
469 r = hwclock_get_time(&tm);
471 sd_bus_error_set_errnof(error, -r, "Failed to read RTC: %s", strerror(-r));
475 t = (usec_t) mktime(&tm) * USEC_PER_SEC;
477 r = sd_bus_message_append(reply, "t", t);
484 static int property_get_time(
487 const char *interface,
488 const char *property,
489 sd_bus_message *reply,
495 r = sd_bus_message_append(reply, "t", now(CLOCK_REALTIME));
502 static int property_get_ntp_sync(
505 const char *interface,
506 const char *property,
507 sd_bus_message *reply,
513 r = sd_bus_message_append(reply, "b", ntp_synced());
520 static int method_set_timezone(sd_bus *bus, sd_bus_message *m, void *userdata) {
521 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
522 Context *c = userdata;
524 unsigned interactive;
532 r = sd_bus_message_read(m, "sb", &z, &interactive);
534 return sd_bus_reply_method_errno(bus, m, r, NULL);
536 if (!valid_timezone(z))
537 return sd_bus_reply_method_errorf(bus, m, SD_BUS_ERROR_INVALID_ARGS, "Invalid time zone '%s'", z);
539 if (streq_ptr(z, c->zone))
540 return sd_bus_reply_method_return(bus, m, NULL);
542 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-timezone", interactive, &error, method_set_timezone, c);
544 return sd_bus_reply_method_errno(bus, m, r, &error);
546 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
555 /* 1. Write new configuration file */
556 r = context_write_data_timezone(c);
558 log_error("Failed to set timezone: %s", strerror(-r));
559 return sd_bus_reply_method_errnof(bus, m, r, "Failed to set timezone: %s", strerror(-r));
562 /* 2. Tell the kernel our timezone */
563 hwclock_set_timezone(NULL);
569 /* 3. Sync RTC from system clock, with the new delta */
570 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
571 assert_se(tm = localtime(&ts.tv_sec));
572 hwclock_set_time(tm);
576 MESSAGE_ID(SD_MESSAGE_TIMEZONE_CHANGE),
577 "TIMEZONE=%s", c->zone,
578 "MESSAGE=Changed timezone to '%s'.", c->zone,
581 sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "Timezone", NULL);
583 return sd_bus_reply_method_return(bus, m, NULL);
586 static int method_set_local_rtc(sd_bus *bus, sd_bus_message *m, void *userdata) {
587 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
588 unsigned lrtc, fix_system, interactive;
589 Context *c = userdata;
597 r = sd_bus_message_read(m, "bbb", &lrtc, &fix_system, &interactive);
599 return sd_bus_reply_method_errno(bus, m, r, NULL);
601 if (lrtc == c->local_rtc)
602 return sd_bus_reply_method_return(bus, m, NULL);
604 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-local-rtc", interactive, &error, method_set_local_rtc, c);
606 return sd_bus_reply_method_errno(bus, m, r, &error);
612 /* 1. Write new configuration file */
613 r = context_write_data_local_rtc(c);
615 log_error("Failed to set RTC to local/UTC: %s", strerror(-r));
616 return sd_bus_reply_method_errnof(bus, m, r, "Failed to set RTC to local/UTC: %s", strerror(-r));
619 /* 2. Tell the kernel our timezone */
620 hwclock_set_timezone(NULL);
622 /* 3. Synchronize clocks */
623 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
628 /* Sync system clock from RTC; first,
629 * initialize the timezone fields of
632 tm = *localtime(&ts.tv_sec);
634 tm = *gmtime(&ts.tv_sec);
636 /* Override the main fields of
637 * struct tm, but not the timezone
639 if (hwclock_get_time(&tm) >= 0) {
641 /* And set the system clock
644 ts.tv_sec = mktime(&tm);
646 ts.tv_sec = timegm(&tm);
648 clock_settime(CLOCK_REALTIME, &ts);
654 /* Sync RTC from system clock */
656 tm = localtime(&ts.tv_sec);
658 tm = gmtime(&ts.tv_sec);
660 hwclock_set_time(tm);
663 log_info("RTC configured to %s time.", c->local_rtc ? "local" : "UTC");
665 sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "LocalRTC", NULL);
667 return sd_bus_reply_method_return(bus, m, NULL);
670 static int method_set_time(sd_bus *bus, sd_bus_message *m, void *userdata) {
671 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
672 unsigned relative, interactive;
673 Context *c = userdata;
683 r = sd_bus_message_read(m, "xbb", &utc, &relative, &interactive);
685 return sd_bus_reply_method_errno(bus, m, r, NULL);
687 if (!relative && utc <= 0)
688 return sd_bus_reply_method_errorf(bus, m, SD_BUS_ERROR_INVALID_ARGS, "Invalid absolute time");
690 if (relative && utc == 0)
691 return sd_bus_reply_method_return(bus, m, NULL);
696 n = now(CLOCK_REALTIME);
699 if ((utc > 0 && x < n) ||
701 return sd_bus_reply_method_errorf(bus, m, SD_BUS_ERROR_INVALID_ARGS, "Time value overflow");
703 timespec_store(&ts, x);
705 timespec_store(&ts, (usec_t) utc);
707 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-time", interactive, &error, method_set_time, c);
709 return sd_bus_reply_method_errno(bus, m, r, &error);
713 /* Set system clock */
714 if (clock_settime(CLOCK_REALTIME, &ts) < 0) {
715 log_error("Failed to set local time: %m");
716 return sd_bus_reply_method_errnof(bus, m, errno, "Failed to set local time: %m");
719 /* Sync down to RTC */
721 tm = localtime(&ts.tv_sec);
723 tm = gmtime(&ts.tv_sec);
725 hwclock_set_time(tm);
728 MESSAGE_ID(SD_MESSAGE_TIME_CHANGE),
729 "REALTIME=%llu", (unsigned long long) timespec_load(&ts),
730 "MESSAGE=Changed local time to %s", ctime(&ts.tv_sec),
733 return sd_bus_reply_method_return(bus, m, NULL);
736 static int method_set_ntp(sd_bus *bus, sd_bus_message *m, void *userdata) {
737 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
738 unsigned ntp, interactive;
739 Context *c = userdata;
742 r = sd_bus_message_read(m, "bb", &ntp, &interactive);
744 return sd_bus_reply_method_errno(bus, m, r, NULL);
746 if (ntp == c->use_ntp)
747 return sd_bus_reply_method_return(bus, m, NULL);
749 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-ntp", interactive, &error, method_set_ntp, c);
751 return sd_bus_reply_method_errno(bus, m, r, &error);
757 r = context_enable_ntp(c, bus, &error);
759 return sd_bus_reply_method_errno(bus, m, r, &error);
761 r = context_start_ntp(c, bus, &error);
763 return sd_bus_reply_method_errno(bus, m, r, &error);
765 log_info("Set NTP to %s", c->use_ntp ? "enabled" : "disabled");
767 sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "NTP", NULL);
769 return sd_bus_reply_method_return(bus, m, NULL);
772 static const sd_bus_vtable timedate_vtable[] = {
773 SD_BUS_VTABLE_START(0),
774 SD_BUS_PROPERTY("Timezone", "s", NULL, offsetof(Context, zone), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
775 SD_BUS_PROPERTY("LocalRTC", "b", NULL, offsetof(Context, local_rtc), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
776 SD_BUS_PROPERTY("CanNTP", "b", bus_property_get_tristate, offsetof(Context, can_ntp), 0),
777 SD_BUS_PROPERTY("NTP", "b", bus_property_get_tristate, offsetof(Context, use_ntp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
778 SD_BUS_PROPERTY("NTPSynchronized", "b", property_get_ntp_sync, 0, 0),
779 SD_BUS_PROPERTY("TimeUSec", "t", property_get_time, 0, 0),
780 SD_BUS_PROPERTY("RTCTimeUSec", "t", property_get_rtc_time, 0, 0),
781 SD_BUS_METHOD("SetTime", "xbb", NULL, method_set_time, 0),
782 SD_BUS_METHOD("SetTimezone", "sb", NULL, method_set_timezone, 0),
783 SD_BUS_METHOD("SetLocalRTC", "bbb", NULL, method_set_local_rtc, 0),
784 SD_BUS_METHOD("SetNTP", "bb", NULL, method_set_ntp, 0),
788 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
789 _cleanup_bus_unref_ sd_bus *bus = NULL;
796 r = sd_bus_open_system(&bus);
798 log_error("Failed to get system bus connection: %s", strerror(-r));
802 r = sd_bus_add_object_vtable(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", timedate_vtable, c);
804 log_error("Failed to register object: %s", strerror(-r));
808 r = sd_bus_request_name(bus, "org.freedesktop.timedate1", SD_BUS_NAME_DO_NOT_QUEUE);
810 log_error("Failed to register name: %s", strerror(-r));
814 if (r != SD_BUS_NAME_PRIMARY_OWNER) {
815 log_error("Failed to acquire name.");
819 r = sd_bus_attach_event(bus, event, 0);
821 log_error("Failed to attach bus to event loop: %s", strerror(-r));
831 int main(int argc, char *argv[]) {
839 _cleanup_event_unref_ sd_event *event = NULL;
840 _cleanup_bus_unref_ sd_bus *bus = NULL;
843 log_set_target(LOG_TARGET_AUTO);
844 log_parse_environment();
850 log_error("This program takes no arguments.");
855 r = sd_event_new(&event);
857 log_error("Failed to allocate event loop: %s", strerror(-r));
861 r = connect_bus(&context, event, &bus);
865 r = context_read_data(&context);
867 log_error("Failed to read timezone data: %s", strerror(-r));
871 r = context_read_ntp(&context, bus);
873 log_error("Failed to determine whether NTP is enabled: %s", strerror(-r));
877 r = bus_event_loop_with_idle(event, bus, "org.freedesktop.timedate1", DEFAULT_EXIT_USEC);
879 log_error("Failed to run event loop: %s", strerror(-r));
886 context_free(&context, bus);
888 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;