#include <dbus/dbus.h>

#include <errno.h>

#include <string.h>

#include <unistd.h>

#include "systemd/sd-id128.h"

#include "systemd/sd-messages.h"

#include "util.h"

#include "strv.h"

#include "dbus-common.h"

#include "polkit.h"

#include "def.h"

#include "hwclock.h"

#include "conf-files.h"

#define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"

#define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n"

#define INTERFACE \

" <interface name=\"org.freedesktop.timedate1\">\n" \

" <property name=\"Timezone\" type=\"s\" access=\"read\"/>\n" \

" <property name=\"LocalRTC\" type=\"b\" access=\"read\"/>\n" \

" <property name=\"NTP\" type=\"b\" access=\"read\"/>\n" \

" <method name=\"SetTime\">\n" \

" <arg name=\"usec_utc\" type=\"x\" direction=\"in\"/>\n" \

" <arg name=\"relative\" type=\"b\" direction=\"in\"/>\n" \

" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \

" </method>\n" \

" <method name=\"SetTimezone\">\n" \

" <arg name=\"timezone\" type=\"s\" direction=\"in\"/>\n" \

" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \

" </method>\n" \

" <method name=\"SetLocalRTC\">\n" \

" <arg name=\"local_rtc\" type=\"b\" direction=\"in\"/>\n" \

" <arg name=\"fix_system\" type=\"b\" direction=\"in\"/>\n" \

" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \

" </method>\n" \

" <method name=\"SetNTP\">\n" \

" <arg name=\"use_ntp\" type=\"b\" direction=\"in\"/>\n" \

" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \

" </method>\n" \

" </interface>\n"

#define INTROSPECTION \

DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \

"<node>\n" \

INTERFACE \

BUS_PROPERTIES_INTERFACE \

BUS_INTROSPECTABLE_INTERFACE \

BUS_PEER_INTERFACE \

"</node>\n"

#define INTERFACES_LIST \

BUS_GENERIC_INTERFACES_LIST \

"org.freedesktop.timedate1\0"

const char timedate_interface[] _introspect_("timedate1") = INTERFACE;

typedef struct TZ {

char *zone;

bool local_rtc;

int use_ntp;

} TZ;

static TZ tz = {

.use_ntp = -1,

};

static usec_t remain_until;

static void free_data(void) {

free(tz.zone);

tz.zone = NULL;

tz.local_rtc = false;

}

static bool valid_timezone(const char *name) {

const char *p;

char *t;

bool slash = false;

int r;

struct stat st;

assert(name);

if (*name == '/' || *name == 0)

return false;

for (p = name; *p; p++) {

if (!(*p >= '0' && *p <= '9') &&

!(*p >= 'a' && *p <= 'z') &&

!(*p >= 'A' && *p <= 'Z') &&

!(*p == '-' || *p == '_' || *p == '+' || *p == '/'))

return false;

if (*p == '/') {

if (slash)

return false;

slash = true;

} else

slash = false;

}

if (slash)

return false;

t = strappend("/usr/share/zoneinfo/", name);

if (!t)

return false;

r = stat(t, &st);

free(t);

if (r < 0)

return false;

if (!S_ISREG(st.st_mode))

return false;

return true;

}

static void verify_timezone(void) {

char *p, *a = NULL, *b = NULL;

size_t l, q;

int j, k;

if (!tz.zone)

return;

p = strappend("/usr/share/zoneinfo/", tz.zone);

if (!p) {

log_oom();

return;

}

j = read_full_file("/etc/localtime", &a, &l);

k = read_full_file(p, &b, &q);

free(p);

if (j < 0 || k < 0 || l != q || memcmp(a, b, l)) {

log_warning("/etc/localtime and /etc/timezone out of sync.");

free(tz.zone);

tz.zone = NULL;

}

free(a);

free(b);

}

static int read_data(void) {

int r;

free_data();

r = read_one_line_file("/etc/timezone", &tz.zone);

if (r < 0) {

if (r != -ENOENT)

log_warning("Failed to read /etc/timezone: %s", strerror(-r));

#ifdef TARGET_FEDORA

r = parse_env_file("/etc/sysconfig/clock", NEWLINE,

"ZONE", &tz.zone,

NULL);

if (r < 0 && r != -ENOENT)

log_warning("Failed to read /etc/sysconfig/clock: %s", strerror(-r));

#endif

}

if (isempty(tz.zone)) {

free(tz.zone);

tz.zone = NULL;

}

verify_timezone();

tz.local_rtc = hwclock_is_localtime() > 0;

return 0;

}

static int write_data_timezone(void) {

int r = 0;

char *p;

if (!tz.zone) {

if (unlink("/etc/timezone") < 0 && errno != ENOENT)

r = -errno;

if (unlink("/etc/localtime") < 0 && errno != ENOENT)

r = -errno;

return r;

}

p = strappend("/usr/share/zoneinfo/", tz.zone);

if (!p)

return log_oom();

r = symlink_or_copy_atomic(p, "/etc/localtime");

free(p);

if (r < 0)

return r;

r = write_one_line_file_atomic("/etc/timezone", tz.zone);

if (r < 0)

return r;

return 0;

}

static int write_data_local_rtc(void) {

int r;

char *s, *w;

r = read_full_file("/etc/adjtime", &s, NULL);

if (r < 0) {

if (r != -ENOENT)

return r;

if (!tz.local_rtc)

return 0;

w = strdup(NULL_ADJTIME_LOCAL);

if (!w)

return -ENOMEM;

} else {

char *p, *e;

size_t a, b;

p = strchr(s, '\n');

if (!p) {

free(s);

return -EIO;

}

p = strchr(p+1, '\n');

if (!p) {

free(s);

return -EIO;

}

p++;

e = strchr(p, '\n');

if (!e) {

free(s);

return -EIO;

}

a = p - s;

b = strlen(e);

w = new(char, a + (tz.local_rtc ? 5 : 3) + b + 1);

if (!w) {

free(s);

return -ENOMEM;

}

*(char*) mempcpy(stpcpy(mempcpy(w, s, a), tz.local_rtc ? "LOCAL" : "UTC"), e, b) = 0;

if (streq(w, NULL_ADJTIME_UTC)) {

free(w);

if (unlink("/etc/adjtime") < 0) {

if (errno != ENOENT)

return -errno;

}

return 0;

}

}

r = write_one_line_file_atomic("/etc/adjtime", w);

free(w);

return r;

}

static char** get_ntp_services(void) {

char **r = NULL, **files, **i;

int k;

k = conf_files_list(&files, ".list",

"/etc/systemd/ntp-units.d",

"/run/systemd/ntp-units.d",

"/usr/local/lib/systemd/ntp-units.d",

"/usr/lib/systemd/ntp-units.d",

NULL);

if (k < 0)

return NULL;

STRV_FOREACH(i, files) {

FILE *f;

f = fopen(*i, "re");

if (!f)

continue;

for (;;) {

char line[PATH_MAX], *l, **q;

if (!fgets(line, sizeof(line), f)) {

if (ferror(f))

log_error("Failed to read NTP units file: %m");

break;

}

l = strstrip(line);

if (l[0] == 0 || l[0] == '#')

continue;

q = strv_append(r, l);

if (!q) {

log_oom();

break;

}

strv_free(r);

r = q;

}

fclose(f);

}

strv_free(files);

return strv_uniq(r);

}

static int read_ntp(DBusConnection *bus) {

DBusMessage *m = NULL, *reply = NULL;

DBusError error;

int r;

char **i, **l;

assert(bus);

dbus_error_init(&error);

l = get_ntp_services();

STRV_FOREACH(i, l) {

const char *s;

if (m)

dbus_message_unref(m);

m = dbus_message_new_method_call(

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"GetUnitFileState");

if (!m) {

r = log_oom();

goto finish;

}

if (!dbus_message_append_args(m,

DBUS_TYPE_STRING, i,

DBUS_TYPE_INVALID)) {

r = log_oom();

goto finish;

}

if (reply)

dbus_message_unref(reply);

reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);

if (!reply) {

if (streq(error.name, "org.freedesktop.DBus.Error.FileNotFound")) {

/* This implementation does not exist, try next one */

dbus_error_free(&error);

continue;

}

log_error("Failed to issue method call: %s", bus_error_message(&error));

r = -EIO;

goto finish;

}

if (!dbus_message_get_args(reply, &error,

DBUS_TYPE_STRING, &s,

DBUS_TYPE_INVALID)) {

log_error("Failed to parse reply: %s", bus_error_message(&error));

r = -EIO;

goto finish;

}

tz.use_ntp =

streq(s, "enabled") ||

streq(s, "enabled-runtime");

r = 0;

goto finish;

}

/* NTP is not installed. */

tz.use_ntp = 0;

r = 0;

finish:

if (m)

dbus_message_unref(m);

if (reply)

dbus_message_unref(reply);

strv_free(l);

dbus_error_free(&error);

return r;

}

static int start_ntp(DBusConnection *bus, DBusError *error) {

DBusMessage *m = NULL, *reply = NULL;

const char *mode = "replace";

char **i, **l;

int r;

assert(bus);

assert(error);

l = get_ntp_services();

STRV_FOREACH(i, l) {

if (m)

dbus_message_unref(m);

m = dbus_message_new_method_call(

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

tz.use_ntp ? "StartUnit" : "StopUnit");

if (!m) {

log_error("Could not allocate message.");

r = -ENOMEM;

goto finish;

}

if (!dbus_message_append_args(m,

DBUS_TYPE_STRING, i,

DBUS_TYPE_STRING, &mode,

DBUS_TYPE_INVALID)) {

log_error("Could not append arguments to message.");

r = -ENOMEM;

goto finish;

}

if (reply)

dbus_message_unref(reply);

reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);

if (!reply) {

if (streq(error->name, "org.freedesktop.DBus.Error.FileNotFound") ||

streq(error->name, "org.freedesktop.systemd1.LoadFailed") ||

streq(error->name, "org.freedesktop.systemd1.NoSuchUnit")) {

/* This implementation does not exist, try next one */

dbus_error_free(error);

continue;

}

log_error("Failed to issue method call: %s", bus_error_message(error));

r = -EIO;

goto finish;

}

r = 0;

goto finish;

}

/* No implementaiton available... */

r = -ENOENT;

finish:

if (m)

dbus_message_unref(m);

if (reply)

dbus_message_unref(reply);

strv_free(l);

return r;

}

static int enable_ntp(DBusConnection *bus, DBusError *error) {

DBusMessage *m = NULL, *reply = NULL;

int r;

DBusMessageIter iter;

dbus_bool_t f = FALSE, t = TRUE;

char **i, **l;

assert(bus);

assert(error);

l = get_ntp_services();

STRV_FOREACH(i, l) {

char* k[2];

if (m)

dbus_message_unref(m);

m = dbus_message_new_method_call(

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

tz.use_ntp ? "EnableUnitFiles" : "DisableUnitFiles");

if (!m) {

log_error("Could not allocate message.");

r = -ENOMEM;

goto finish;

}

dbus_message_iter_init_append(m, &iter);

k[0] = *i;

k[1] = NULL;

r = bus_append_strv_iter(&iter, k);

if (r < 0) {

log_error("Failed to append unit files.");

goto finish;

}

/* send runtime bool */

if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &f)) {

log_error("Failed to append runtime boolean.");

r = -ENOMEM;

goto finish;

}

if (tz.use_ntp) {

/* send force bool */

if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &t)) {

log_error("Failed to append force boolean.");

r = -ENOMEM;

goto finish;

}

}

if (reply)

dbus_message_unref(reply);

reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);

if (!reply) {

if (streq(error->name, "org.freedesktop.DBus.Error.FileNotFound")) {

/* This implementation does not exist, try next one */

dbus_error_free(error);

continue;

}

log_error("Failed to issue method call: %s", bus_error_message(error));

r = -EIO;

goto finish;

}

dbus_message_unref(m);

m = dbus_message_new_method_call(

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"Reload");

if (!m) {

log_error("Could not allocate message.");

r = -ENOMEM;

goto finish;

}

dbus_message_unref(reply);

reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);

if (!reply) {

log_error("Failed to issue method call: %s", bus_error_message(error));

r = -EIO;

goto finish;

}

r = 0;

goto finish;

}

r = -ENOENT;

finish:

if (m)

dbus_message_unref(m);

if (reply)

dbus_message_unref(reply);

strv_free(l);

return r;

}

static int property_append_ntp(DBusMessageIter *i, const char *property, void *data) {

dbus_bool_t db;

assert(i);

assert(property);

db = tz.use_ntp > 0;

if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))

return -ENOMEM;

return 0;

}

static const BusProperty bus_timedate_properties[] = {

{ "Timezone", bus_property_append_string, "s", offsetof(TZ, zone), true },

{ "LocalRTC", bus_property_append_bool, "b", offsetof(TZ, local_rtc) },

{ "NTP", property_append_ntp, "b", offsetof(TZ, use_ntp) },

{ NULL, }

};

static const BusBoundProperties bps[] = {

{ "org.freedesktop.timedate1", bus_timedate_properties, &tz },

{ NULL, }

};

static DBusHandlerResult timedate_message_handler(

DBusConnection *connection,

DBusMessage *message,

void *userdata) {

DBusMessage *reply = NULL, *changed = NULL;

DBusError error;

int r;

assert(connection);

assert(message);

dbus_error_init(&error);

if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTimezone")) {

const char *z;

dbus_bool_t interactive;

if (!dbus_message_get_args(

message,

&error,

DBUS_TYPE_STRING, &z,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID))

return bus_send_error_reply(connection, message, &error, -EINVAL);

if (!valid_timezone(z))

return bus_send_error_reply(connection, message, NULL, -EINVAL);

if (!streq_ptr(z, tz.zone)) {

char *t;

r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-timezone", interactive, NULL, &error);

if (r < 0)

return bus_send_error_reply(connection, message, &error, r);

t = strdup(z);

if (!t)

goto oom;

free(tz.zone);

tz.zone = t;

/* 1. Write new configuration file */

r = write_data_timezone();

if (r < 0) {

log_error("Failed to set timezone: %s", strerror(-r));

return bus_send_error_reply(connection, message, NULL, r);

}

if (tz.local_rtc) {

struct timespec ts;

struct tm *tm;

/* 2. Teach kernel new timezone */

hwclock_apply_localtime_delta(NULL);

/* 3. Sync RTC from system clock, with the new delta */

assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);

assert_se(tm = localtime(&ts.tv_sec));

hwclock_set_time(tm);

}

log_struct(LOG_INFO,

"MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(SD_MESSAGE_TIMEZONE_CHANGE),

"TIMEZONE=%s", tz.zone,

"MESSAGE=Changed timezone to '%s'.", tz.zone,

NULL);

changed = bus_properties_changed_new(

"/org/freedesktop/timedate1",

"org.freedesktop.timedate1",

"Timezone\0");

if (!changed)

goto oom;

}

} else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetLocalRTC")) {

dbus_bool_t lrtc;

dbus_bool_t fix_system;

dbus_bool_t interactive;

if (!dbus_message_get_args(

message,

&error,

DBUS_TYPE_BOOLEAN, &lrtc,

DBUS_TYPE_BOOLEAN, &fix_system,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID))

return bus_send_error_reply(connection, message, &error, -EINVAL);

if (lrtc != tz.local_rtc) {

struct timespec ts;

r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-local-rtc", interactive, NULL, &error);

if (r < 0)

return bus_send_error_reply(connection, message, &error, r);

tz.local_rtc = lrtc;

/* 1. Write new configuration file */

r = write_data_local_rtc();

if (r < 0) {

log_error("Failed to set RTC to local/UTC: %s", strerror(-r));

return bus_send_error_reply(connection, message, NULL, r);

}

/* 2. Teach kernel new timezone */

if (tz.local_rtc)

hwclock_apply_localtime_delta(NULL);

else

hwclock_reset_localtime_delta();

/* 3. Synchronize clocks */

assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);

if (fix_system) {

struct tm tm;

/* Sync system clock from RTC; first,

if (tz.local_rtc)

tm = *localtime(&ts.tv_sec);

else

tm = *gmtime(&ts.tv_sec);

/* Override the main fields of

if (hwclock_get_time(&tm) >= 0) {

/* And set the system clock

if (tz.local_rtc)

ts.tv_sec = mktime(&tm);

else

ts.tv_sec = timegm(&tm);

clock_settime(CLOCK_REALTIME, &ts);

}

} else {

struct tm *tm;

/* Sync RTC from system clock */

if (tz.local_rtc)

tm = localtime(&ts.tv_sec);

else

tm = gmtime(&ts.tv_sec);

hwclock_set_time(tm);

}

log_info("RTC configured to %s time.", tz.local_rtc ? "local" : "UTC");

changed = bus_properties_changed_new(

"/org/freedesktop/timedate1",

"org.freedesktop.timedate1",

"LocalRTC\0");

if (!changed)

goto oom;

}

} else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTime")) {

int64_t utc;

dbus_bool_t relative;

dbus_bool_t interactive;

if (!dbus_message_get_args(

message,

&error,

DBUS_TYPE_INT64, &utc,

DBUS_TYPE_BOOLEAN, &relative,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID))

return bus_send_error_reply(connection, message, &error, -EINVAL);

if (!relative && utc <= 0)

return bus_send_error_reply(connection, message, NULL, -EINVAL);

if (!relative || utc != 0) {

struct timespec ts;

struct tm* tm;

r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-time", interactive, NULL, &error);

if (r < 0)

return bus_send_error_reply(connection, message, &error, r);

if (relative)

timespec_store(&ts, now(CLOCK_REALTIME) + utc);

else

timespec_store(&ts, utc);

/* Set system clock */

if (clock_settime(CLOCK_REALTIME, &ts) < 0) {

log_error("Failed to set local time: %m");

return bus_send_error_reply(connection, message, NULL, -errno);

}

/* Sync down to RTC */

if (tz.local_rtc)

tm = localtime(&ts.tv_sec);

else

tm = gmtime(&ts.tv_sec);

hwclock_set_time(tm);

log_struct(LOG_INFO,

"MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(SD_MESSAGE_TIME_CHANGE),

"REALTIME=%llu", (unsigned long long) timespec_load(&ts),

"MESSAGE=Changed local time to %s", ctime(&ts.tv_sec),

NULL);

}

} else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetNTP")) {

dbus_bool_t ntp;

dbus_bool_t interactive;

if (!dbus_message_get_args(

message,

&error,

DBUS_TYPE_BOOLEAN, &ntp,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID))

return bus_send_error_reply(connection, message, &error, -EINVAL);

if (ntp != !!tz.use_ntp) {

r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-ntp", interactive, NULL, &error);

if (r < 0)

return bus_send_error_reply(connection, message, &error, r);

tz.use_ntp = !!ntp;

r = enable_ntp(connection, &error);

if (r < 0)

return bus_send_error_reply(connection, message, &error, r);

r = start_ntp(connection, &error);

if (r < 0)

return bus_send_error_reply(connection, message, &error, r);

log_info("Set NTP to %s", tz.use_ntp ? "enabled" : "disabled");

changed = bus_properties_changed_new(

"/org/freedesktop/timedate1",

"org.freedesktop.timedate1",

"NTP\0");

if (!changed)

goto oom;

}

} else

return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, bps);

if (!(reply = dbus_message_new_method_return(message)))

goto oom;

if (!dbus_connection_send(connection, reply, NULL))

goto oom;

dbus_message_unref(reply);

reply = NULL;

if (changed) {

if (!dbus_connection_send(connection, changed, NULL))

goto oom;

dbus_message_unref(changed);

}

return DBUS_HANDLER_RESULT_HANDLED;

oom:

if (reply)

dbus_message_unref(reply);

if (changed)

dbus_message_unref(changed);

dbus_error_free(&error);

return DBUS_HANDLER_RESULT_NEED_MEMORY;

}

static int connect_bus(DBusConnection **_bus) {

static const DBusObjectPathVTable timedate_vtable = {

.message_function = timedate_message_handler

};

DBusError error;

DBusConnection *bus = NULL;

int r;

assert(_bus);

dbus_error_init(&error);

bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);

if (!bus) {

log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));

r = -ECONNREFUSED;

goto fail;

}

dbus_connection_set_exit_on_disconnect(bus, FALSE);

if (!dbus_connection_register_object_path(bus, "/org/freedesktop/timedate1", &timedate_vtable, NULL) ||

!dbus_connection_add_filter(bus, bus_exit_idle_filter, &remain_until, NULL)) {

r = log_oom();

goto fail;

}

r = dbus_bus_request_name(bus, "org.freedesktop.timedate1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);

if (dbus_error_is_set(&error)) {

log_error("Failed to register name on bus: %s", bus_error_message(&error));

r = -EEXIST;

goto fail;

}

if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {

log_error("Failed to acquire name.");

r = -EEXIST;

goto fail;

}

if (_bus)

*_bus = bus;

return 0;

fail:

dbus_connection_close(bus);

dbus_connection_unref(bus);

dbus_error_free(&error);

return r;

}

int main(int argc, char *argv[]) {

int r;

DBusConnection *bus = NULL;

bool exiting = false;

log_set_target(LOG_TARGET_AUTO);

log_parse_environment();

log_open();

umask(0022);

if (argc == 2 && streq(argv[1], "--introspect")) {

fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE

"<node>\n", stdout);

fputs(timedate_interface, stdout);

fputs("</node>\n", stdout);

return 0;

}

if (argc != 1) {

log_error("This program takes no arguments.");

r = -EINVAL;

goto finish;

}

r = read_data();

if (r < 0) {

log_error("Failed to read timezone data: %s", strerror(-r));

goto finish;

}

r = connect_bus(&bus);

if (r < 0)

goto finish;

r = read_ntp(bus);

if (r < 0) {

log_error("Failed to determine whether NTP is enabled: %s", strerror(-r));

goto finish;

}

remain_until = now(CLOCK_MONOTONIC) + DEFAULT_EXIT_USEC;

for (;;) {

if (!dbus_connection_read_write_dispatch(bus, exiting ? -1 : (int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC)))

break;

if (!exiting && remain_until < now(CLOCK_MONOTONIC)) {

exiting = true;

bus_async_unregister_and_exit(bus, "org.freedesktop.hostname1");

}

}

r = 0;

finish:

free_data();

if (bus) {

dbus_connection_flush(bus);

dbus_connection_close(bus);

dbus_connection_unref(bus);

}

return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

}