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;
528 r = sd_bus_message_read(m, "sb", &z, &interactive);
530 return sd_bus_reply_method_errno(bus, m, r, NULL);
532 if (!valid_timezone(z))
533 return sd_bus_reply_method_errorf(bus, m, SD_BUS_ERROR_INVALID_ARGS, "Invalid time zone '%s'", z);
535 if (streq_ptr(z, c->zone))
536 return sd_bus_reply_method_return(bus, m, NULL);
538 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-timezone", interactive, &error, method_set_timezone, c);
540 return sd_bus_reply_method_errno(bus, m, r, &error);
542 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
551 /* 1. Write new configuration file */
552 r = context_write_data_timezone(c);
554 log_error("Failed to set timezone: %s", strerror(-r));
555 return sd_bus_reply_method_errnof(bus, m, r, "Failed to set timezone: %s", strerror(-r));
558 /* 2. Tell the kernel our timezone */
559 hwclock_set_timezone(NULL);
565 /* 3. Sync RTC from system clock, with the new delta */
566 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
567 assert_se(tm = localtime(&ts.tv_sec));
568 hwclock_set_time(tm);
572 MESSAGE_ID(SD_MESSAGE_TIMEZONE_CHANGE),
573 "TIMEZONE=%s", c->zone,
574 "MESSAGE=Changed timezone to '%s'.", c->zone,
577 sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "Timezone", NULL);
579 return sd_bus_reply_method_return(bus, m, NULL);
582 static int method_set_local_rtc(sd_bus *bus, sd_bus_message *m, void *userdata) {
583 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
584 bool lrtc, fix_system, interactive;
585 Context *c = userdata;
593 r = sd_bus_message_read(m, "bbb", &lrtc, &fix_system, &interactive);
595 return sd_bus_reply_method_errno(bus, m, r, NULL);
597 if (lrtc == c->local_rtc)
598 return sd_bus_reply_method_return(bus, m, NULL);
600 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-local-rtc", interactive, &error, method_set_local_rtc, c);
602 return sd_bus_reply_method_errno(bus, m, r, &error);
608 /* 1. Write new configuration file */
609 r = context_write_data_local_rtc(c);
611 log_error("Failed to set RTC to local/UTC: %s", strerror(-r));
612 return sd_bus_reply_method_errnof(bus, m, r, "Failed to set RTC to local/UTC: %s", strerror(-r));
615 /* 2. Tell the kernel our timezone */
616 hwclock_set_timezone(NULL);
618 /* 3. Synchronize clocks */
619 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
624 /* Sync system clock from RTC; first,
625 * initialize the timezone fields of
628 tm = *localtime(&ts.tv_sec);
630 tm = *gmtime(&ts.tv_sec);
632 /* Override the main fields of
633 * struct tm, but not the timezone
635 if (hwclock_get_time(&tm) >= 0) {
637 /* And set the system clock
640 ts.tv_sec = mktime(&tm);
642 ts.tv_sec = timegm(&tm);
644 clock_settime(CLOCK_REALTIME, &ts);
650 /* Sync RTC from system clock */
652 tm = localtime(&ts.tv_sec);
654 tm = gmtime(&ts.tv_sec);
656 hwclock_set_time(tm);
659 log_info("RTC configured to %s time.", c->local_rtc ? "local" : "UTC");
661 sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "LocalRTC", NULL);
663 return sd_bus_reply_method_return(bus, m, NULL);
666 static int method_set_time(sd_bus *bus, sd_bus_message *m, void *userdata) {
667 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
668 bool relative, interactive;
669 Context *c = userdata;
679 r = sd_bus_message_read(m, "xbb", &utc, &relative, &interactive);
681 return sd_bus_reply_method_errno(bus, m, r, NULL);
683 if (!relative && utc <= 0)
684 return sd_bus_reply_method_errorf(bus, m, SD_BUS_ERROR_INVALID_ARGS, "Invalid absolute time");
686 if (relative && utc == 0)
687 return sd_bus_reply_method_return(bus, m, NULL);
692 n = now(CLOCK_REALTIME);
695 if ((utc > 0 && x < n) ||
697 return sd_bus_reply_method_errorf(bus, m, SD_BUS_ERROR_INVALID_ARGS, "Time value overflow");
699 timespec_store(&ts, x);
701 timespec_store(&ts, (usec_t) utc);
703 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-time", interactive, &error, method_set_time, c);
705 return sd_bus_reply_method_errno(bus, m, r, &error);
709 /* Set system clock */
710 if (clock_settime(CLOCK_REALTIME, &ts) < 0) {
711 log_error("Failed to set local time: %m");
712 return sd_bus_reply_method_errnof(bus, m, errno, "Failed to set local time: %m");
715 /* Sync down to RTC */
717 tm = localtime(&ts.tv_sec);
719 tm = gmtime(&ts.tv_sec);
721 hwclock_set_time(tm);
724 MESSAGE_ID(SD_MESSAGE_TIME_CHANGE),
725 "REALTIME=%llu", (unsigned long long) timespec_load(&ts),
726 "MESSAGE=Changed local time to %s", ctime(&ts.tv_sec),
729 return sd_bus_reply_method_return(bus, m, NULL);
732 static int method_set_ntp(sd_bus *bus, sd_bus_message *m, void *userdata) {
733 _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
734 bool ntp, interactive;
735 Context *c = userdata;
738 r = sd_bus_message_read(m, "bb", &ntp, &interactive);
740 return sd_bus_reply_method_errno(bus, m, r, NULL);
742 if (ntp == c->use_ntp)
743 return sd_bus_reply_method_return(bus, m, NULL);
745 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.timedate1.set-ntp", interactive, &error, method_set_ntp, c);
747 return sd_bus_reply_method_errno(bus, m, r, &error);
753 r = context_enable_ntp(c, bus, &error);
755 return sd_bus_reply_method_errno(bus, m, r, &error);
757 r = context_start_ntp(c, bus, &error);
759 return sd_bus_reply_method_errno(bus, m, r, &error);
761 log_info("Set NTP to %s", c->use_ntp ? "enabled" : "disabled");
763 sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "NTP", NULL);
765 return sd_bus_reply_method_return(bus, m, NULL);
768 static const sd_bus_vtable timedate_vtable[] = {
769 SD_BUS_VTABLE_START(0),
770 SD_BUS_PROPERTY("Timezone", "s", NULL, offsetof(Context, zone), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
771 SD_BUS_PROPERTY("LocalRTC", "b", NULL, offsetof(Context, local_rtc), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
772 SD_BUS_PROPERTY("CanNTP", "b", bus_property_get_tristate, offsetof(Context, can_ntp), 0),
773 SD_BUS_PROPERTY("NTP", "b", bus_property_get_tristate, offsetof(Context, use_ntp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
774 SD_BUS_PROPERTY("NTPSynchronized", "b", property_get_ntp_sync, 0, 0),
775 SD_BUS_PROPERTY("TimeUSec", "t", property_get_time, 0, 0),
776 SD_BUS_PROPERTY("RTCTimeUSec", "t", property_get_rtc_time, 0, 0),
777 SD_BUS_METHOD("SetTime", "xbb", NULL, method_set_time, 0),
778 SD_BUS_METHOD("SetTimezone", "sb", NULL, method_set_timezone, 0),
779 SD_BUS_METHOD("SetLocalRTC", "bbb", NULL, method_set_local_rtc, 0),
780 SD_BUS_METHOD("SetNTP", "bb", NULL, method_set_ntp, 0),
784 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
785 _cleanup_bus_unref_ sd_bus *bus = NULL;
792 r = sd_bus_open_system(&bus);
794 log_error("Failed to get system bus connection: %s", strerror(-r));
798 r = sd_bus_add_object_vtable(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", timedate_vtable, c);
800 log_error("Failed to register object: %s", strerror(-r));
804 r = sd_bus_request_name(bus, "org.freedesktop.timedate1", SD_BUS_NAME_DO_NOT_QUEUE);
806 log_error("Failed to register name: %s", strerror(-r));
810 if (r != SD_BUS_NAME_PRIMARY_OWNER) {
811 log_error("Failed to acquire name.");
815 r = sd_bus_attach_event(bus, event, 0);
817 log_error("Failed to attach bus to event loop: %s", strerror(-r));
827 int main(int argc, char *argv[]) {
835 _cleanup_event_unref_ sd_event *event = NULL;
836 _cleanup_bus_unref_ sd_bus *bus = NULL;
839 log_set_target(LOG_TARGET_AUTO);
840 log_set_max_level(LOG_DEBUG);
841 log_parse_environment();
847 log_error("This program takes no arguments.");
852 r = sd_event_new(&event);
854 log_error("Failed to allocate event loop: %s", strerror(-r));
858 r = connect_bus(&context, event, &bus);
862 r = context_read_data(&context);
864 log_error("Failed to read timezone data: %s", strerror(-r));
868 r = context_read_ntp(&context, bus);
870 log_error("Failed to determine whether NTP is enabled: %s", strerror(-r));
874 r = bus_event_loop_with_idle(event, bus, "org.freedesktop.timedate1", DEFAULT_EXIT_USEC);
876 log_error("Failed to run event loop: %s", strerror(-r));
884 context_free(&context, bus);
886 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;