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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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#include <dbus/dbus.h>
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#include "dbus-common.h"
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#define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"
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#define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n"
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" <interface name=\"org.freedesktop.timedate1\">\n" \
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" <property name=\"Timezone\" type=\"s\" access=\"read\"/>\n" \
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" <property name=\"LocalRTC\" type=\"b\" access=\"read\"/>\n" \
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" <property name=\"NTP\" type=\"b\" access=\"read\"/>\n" \
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" <method name=\"SetTime\">\n" \
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" <arg name=\"usec_utc\" type=\"x\" direction=\"in\"/>\n" \
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" <arg name=\"relative\" type=\"b\" direction=\"in\"/>\n" \
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" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
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" <method name=\"SetTimezone\">\n" \
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" <arg name=\"timezone\" type=\"s\" direction=\"in\"/>\n" \
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" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
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" <method name=\"SetLocalRTC\">\n" \
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" <arg name=\"local_rtc\" type=\"b\" direction=\"in\"/>\n" \
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" <arg name=\"fix_system\" type=\"b\" direction=\"in\"/>\n" \
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" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
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" <method name=\"SetNTP\">\n" \
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" <arg name=\"use_ntp\" type=\"b\" direction=\"in\"/>\n" \
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" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
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#define INTROSPECTION \
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DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \
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BUS_PROPERTIES_INTERFACE \
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BUS_INTROSPECTABLE_INTERFACE \
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#define INTERFACES_LIST \
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BUS_GENERIC_INTERFACES_LIST \
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"org.freedesktop.timedate1\0"
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const char timedate_interface[] _introspect_("timedate1") = INTERFACE;
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static char *zone = NULL;
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static bool local_rtc = false;
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static int use_ntp = -1;
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static usec_t remain_until = 0;
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static void free_data(void) {
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static bool valid_timezone(const char *name) {
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if (*name == '/' || *name == 0)
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for (p = name; *p; p++) {
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if (!(*p >= '0' && *p <= '9') &&
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!(*p >= 'a' && *p <= 'z') &&
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!(*p >= 'A' && *p <= 'Z') &&
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!(*p == '-' || *p == '_' || *p == '+' || *p == '/'))
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t = strappend("/usr/share/zoneinfo/", name);
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if (!S_ISREG(st.st_mode))
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static void verify_timezone(void) {
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char *p, *a = NULL, *b = NULL;
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p = strappend("/usr/share/zoneinfo/", zone);
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log_error("Out of memory");
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j = read_full_file("/etc/localtime", &a, &l);
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k = read_full_file(p, &b, &q);
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if (j < 0 || k < 0 || l != q || memcmp(a, b, l)) {
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log_warning("/etc/localtime and /etc/timezone out of sync.");
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static int read_data(void) {
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r = read_one_line_file("/etc/timezone", &zone);
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log_warning("Failed to read /etc/timezone: %s", strerror(-r));
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r = parse_env_file("/etc/sysconfig/clock", NEWLINE,
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if (r < 0 && r != -ENOENT)
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log_warning("Failed to read /etc/sysconfig/clock: %s", strerror(-r));
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local_rtc = hwclock_is_localtime() > 0;
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static int write_data_timezone(void) {
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if (unlink("/etc/timezone") < 0 && errno != ENOENT)
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if (unlink("/etc/localtime") < 0 && errno != ENOENT)
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p = strappend("/usr/share/zoneinfo/", zone);
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log_error("Out of memory");
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r = symlink_or_copy_atomic(p, "/etc/localtime");
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r = write_one_line_file_atomic("/etc/timezone", zone);
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static int write_data_local_rtc(void) {
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r = read_full_file("/etc/adjtime", &s, NULL);
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w = strdup(NULL_ADJTIME_LOCAL);
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p = strchr(p+1, '\n');
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w = new(char, a + (local_rtc ? 5 : 3) + b + 1);
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*(char*) mempcpy(stpcpy(mempcpy(w, s, a), local_rtc ? "LOCAL" : "UTC"), e, b) = 0;
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if (streq(w, NULL_ADJTIME_UTC)) {
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if (unlink("/etc/adjtime") < 0) {
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r = write_one_line_file_atomic("/etc/adjtime", w);
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static int read_ntp(DBusConnection *bus) {
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DBusMessage *m = NULL, *reply = NULL;
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const char *name = "ntpd.service", *s;
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dbus_error_init(&error);
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m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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log_error("Out of memory");
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &name,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
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log_error("Failed to issue method call: %s", bus_error_message(&error));
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if (!dbus_message_get_args(reply, &error,
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DBUS_TYPE_STRING, &s,
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DBUS_TYPE_INVALID)) {
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log_error("Failed to parse reply: %s", bus_error_message(&error));
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streq(s, "enabled") ||
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streq(s, "enabled-runtime");
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dbus_message_unref(m);
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dbus_message_unref(reply);
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dbus_error_free(&error);
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static int start_ntp(DBusConnection *bus, DBusError *error) {
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DBusMessage *m = NULL, *reply = NULL;
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const char *name = "ntpd.service", *mode = "replace";
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m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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use_ntp ? "StartUnit" : "StopUnit");
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log_error("Could not allocate message.");
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &name,
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DBUS_TYPE_STRING, &mode,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);
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log_error("Failed to issue method call: %s", bus_error_message(error));
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dbus_message_unref(m);
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dbus_message_unref(reply);
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static int enable_ntp(DBusConnection *bus, DBusError *error) {
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DBusMessage *m = NULL, *reply = NULL;
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const char * const names[] = { "ntpd.service", NULL };
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DBusMessageIter iter;
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dbus_bool_t f = FALSE, t = TRUE;
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m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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use_ntp ? "EnableUnitFiles" : "DisableUnitFiles");
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log_error("Could not allocate message.");
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dbus_message_iter_init_append(m, &iter);
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r = bus_append_strv_iter(&iter, (char**) names);
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log_error("Failed to append unit files.");
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/* send runtime bool */
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if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &f)) {
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log_error("Failed to append runtime boolean.");
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/* send force bool */
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if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &t)) {
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log_error("Failed to append force boolean.");
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reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);
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log_error("Failed to issue method call: %s", bus_error_message(error));
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dbus_message_unref(m);
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m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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log_error("Could not allocate message.");
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dbus_message_unref(reply);
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reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);
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log_error("Failed to issue method call: %s", bus_error_message(error));
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dbus_message_unref(m);
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dbus_message_unref(reply);
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static int property_append_ntp(DBusMessageIter *i, const char *property, void *data) {
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if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
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static DBusHandlerResult timedate_message_handler(
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DBusConnection *connection,
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DBusMessage *message,
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const BusProperty properties[] = {
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{ "org.freedesktop.timedate1", "Timezone", bus_property_append_string, "s", zone },
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{ "org.freedesktop.timedate1", "LocalRTC", bus_property_append_bool, "b", &local_rtc },
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{ "org.freedesktop.timedate1", "NTP", property_append_ntp, "b", NULL },
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{ NULL, NULL, NULL, NULL, NULL }
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DBusMessage *reply = NULL, *changed = NULL;
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dbus_error_init(&error);
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if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTimezone")) {
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dbus_bool_t interactive;
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if (!dbus_message_get_args(
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DBUS_TYPE_STRING, &z,
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DBUS_TYPE_BOOLEAN, &interactive,
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return bus_send_error_reply(connection, message, &error, -EINVAL);
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if (!valid_timezone(z))
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return bus_send_error_reply(connection, message, NULL, -EINVAL);
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if (!streq_ptr(z, zone)) {
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r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-timezone", interactive, &error);
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return bus_send_error_reply(connection, message, &error, r);
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/* 1. Write new configuration file */
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r = write_data_timezone();
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log_error("Failed to set timezone: %s", strerror(-r));
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return bus_send_error_reply(connection, message, NULL, r);
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/* 2. Teach kernel new timezone */
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hwclock_apply_localtime_delta(NULL);
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/* 3. Sync RTC from system clock, with the new delta */
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assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
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assert_se(tm = localtime(&ts.tv_sec));
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hwclock_set_time(tm);
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log_info("Changed timezone to '%s'.", zone);
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changed = bus_properties_changed_new(
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"/org/freedesktop/timedate1",
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"org.freedesktop.timedate1",
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} else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetLocalRTC")) {
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dbus_bool_t fix_system;
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dbus_bool_t interactive;
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if (!dbus_message_get_args(
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DBUS_TYPE_BOOLEAN, &lrtc,
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DBUS_TYPE_BOOLEAN, &fix_system,
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DBUS_TYPE_BOOLEAN, &interactive,
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return bus_send_error_reply(connection, message, &error, -EINVAL);
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if (lrtc != local_rtc) {
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r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-local-rtc", interactive, &error);
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return bus_send_error_reply(connection, message, &error, r);
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/* 1. Write new configuration file */
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r = write_data_local_rtc();
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log_error("Failed to set RTC to local/UTC: %s", strerror(-r));
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return bus_send_error_reply(connection, message, NULL, r);
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/* 2. Teach kernel new timezone */
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hwclock_apply_localtime_delta(NULL);
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hwclock_reset_localtime_delta();
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/* 3. Synchronize clocks */
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assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
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/* Sync system clock from RTC; first,
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* initialize the timezone fields of
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tm = *localtime(&ts.tv_sec);
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tm = *gmtime(&ts.tv_sec);
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/* Override the main fields of
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* struct tm, but not the timezone
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if (hwclock_get_time(&tm) >= 0) {
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/* And set the system clock
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ts.tv_sec = mktime(&tm);
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ts.tv_sec = timegm(&tm);
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clock_settime(CLOCK_REALTIME, &ts);
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/* Sync RTC from system clock */
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tm = localtime(&ts.tv_sec);
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tm = gmtime(&ts.tv_sec);
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hwclock_set_time(tm);
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log_info("RTC configured to %s time.", local_rtc ? "local" : "UTC");
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changed = bus_properties_changed_new(
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"/org/freedesktop/timedate1",
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"org.freedesktop.timedate1",
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} else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTime")) {
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dbus_bool_t relative;
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dbus_bool_t interactive;
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if (!dbus_message_get_args(
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DBUS_TYPE_INT64, &utc,
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DBUS_TYPE_BOOLEAN, &relative,
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DBUS_TYPE_BOOLEAN, &interactive,
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return bus_send_error_reply(connection, message, &error, -EINVAL);
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if (!relative && utc <= 0)
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return bus_send_error_reply(connection, message, NULL, -EINVAL);
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if (!relative || utc != 0) {
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r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-time", interactive, &error);
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return bus_send_error_reply(connection, message, &error, r);
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timespec_store(&ts, now(CLOCK_REALTIME) + utc);
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timespec_store(&ts, utc);
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/* Set system clock */
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if (clock_settime(CLOCK_REALTIME, &ts) < 0) {
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log_error("Failed to set local time: %m");
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return bus_send_error_reply(connection, message, NULL, -errno);
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/* Sync down to RTC */
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tm = localtime(&ts.tv_sec);
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tm = gmtime(&ts.tv_sec);
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hwclock_set_time(tm);
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log_info("Changed local time to %s", ctime(&ts.tv_sec));
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} else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetNTP")) {
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dbus_bool_t interactive;
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if (!dbus_message_get_args(
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DBUS_TYPE_BOOLEAN, &ntp,
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DBUS_TYPE_BOOLEAN, &interactive,
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return bus_send_error_reply(connection, message, &error, -EINVAL);
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if (ntp != !!use_ntp) {
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r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-ntp", interactive, &error);
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return bus_send_error_reply(connection, message, &error, r);
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r = enable_ntp(connection, &error);
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return bus_send_error_reply(connection, message, &error, r);
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r = start_ntp(connection, &error);
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return bus_send_error_reply(connection, message, &error, r);
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log_info("Set NTP to %s", use_ntp ? "enabled" : "disabled");
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changed = bus_properties_changed_new(
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"/org/freedesktop/timedate1",
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"org.freedesktop.timedate1",
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return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
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if (!(reply = dbus_message_new_method_return(message)))
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if (!dbus_connection_send(connection, reply, NULL))
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dbus_message_unref(reply);
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if (!dbus_connection_send(connection, changed, NULL))
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dbus_message_unref(changed);
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return DBUS_HANDLER_RESULT_HANDLED;
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dbus_message_unref(reply);
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dbus_message_unref(changed);
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dbus_error_free(&error);
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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static int connect_bus(DBusConnection **_bus) {
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static const DBusObjectPathVTable timedate_vtable = {
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.message_function = timedate_message_handler
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DBusConnection *bus = NULL;
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dbus_error_init(&error);
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bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
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log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
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dbus_connection_set_exit_on_disconnect(bus, FALSE);
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if (!dbus_connection_register_object_path(bus, "/org/freedesktop/timedate1", &timedate_vtable, NULL) ||
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!dbus_connection_add_filter(bus, bus_exit_idle_filter, &remain_until, NULL)) {
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log_error("Not enough memory");
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r = dbus_bus_request_name(bus, "org.freedesktop.timedate1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
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if (dbus_error_is_set(&error)) {
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log_error("Failed to register name on bus: %s", bus_error_message(&error));
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if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
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log_error("Failed to acquire name.");
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dbus_connection_close(bus);
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dbus_connection_unref(bus);
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dbus_error_free(&error);
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int main(int argc, char *argv[]) {
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DBusConnection *bus = NULL;
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bool exiting = false;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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if (argc == 2 && streq(argv[1], "--introspect")) {
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fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
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fputs(timedate_interface, stdout);
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fputs("</node>\n", stdout);
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log_error("This program takes no arguments.");
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log_error("Failed to read timezone data: %s", strerror(-r));
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r = connect_bus(&bus);
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log_error("Failed to determine whether NTP is enabled: %s", strerror(-r));
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remain_until = now(CLOCK_MONOTONIC) + DEFAULT_EXIT_USEC;
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if (!dbus_connection_read_write_dispatch(bus, exiting ? -1 : (int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC)))
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if (!exiting && remain_until < now(CLOCK_MONOTONIC)) {
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bus_async_unregister_and_exit(bus, "org.freedesktop.hostname1");
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dbus_connection_flush(bus);
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dbus_connection_close(bus);
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dbus_connection_unref(bus);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
added
removed
src/timedated.c
