#include <errno.h>

#include <string.h>

#include <unistd.h>

#include <sys/capability.h>

#include "sd-id128.h"

#include "sd-messages.h"

#include "sd-event.h"

#include "sd-bus.h"

#include "util.h"

#include "strv.h"

#include "def.h"

#include "clock-util.h"

#include "conf-files.h"

#include "path-util.h"

#include "fileio-label.h"

#include "label.h"

#include "bus-util.h"

#include "bus-errors.h"

#include "event-util.h"

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

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

typedef struct Context {

char *zone;

bool local_rtc;

bool can_ntp;

bool use_ntp;

Hashmap *polkit_registry;

} Context;

static void context_free(Context *c, sd_bus *bus) {

assert(c);

free(c->zone);

bus_verify_polkit_async_registry_free(bus, c->polkit_registry);

}

static int context_read_data(Context *c) {

_cleanup_free_ char *t = NULL;

int r;

assert(c);

r = readlink_malloc("/etc/localtime", &t);

if (r < 0) {

if (r == -EINVAL)

log_warning("/etc/localtime should be a symbolic link to a time zone data file in /usr/share/zoneinfo/.");

else

log_warning("Failed to get target of /etc/localtime: %s", strerror(-r));

} else {

const char *e;

e = path_startswith(t, "/usr/share/zoneinfo/");

if (!e)

e = path_startswith(t, "../usr/share/zoneinfo/");

if (!e)

log_warning("/etc/localtime should be a symbolic link to a time zone data file in /usr/share/zoneinfo/.");

else {

c->zone = strdup(e);

if (!c->zone)

return log_oom();

goto have_timezone;

}

}

have_timezone:

if (isempty(c->zone)) {

free(c->zone);

c->zone = NULL;

}

c->local_rtc = clock_is_localtime() > 0;

return 0;

}

static int context_write_data_timezone(Context *c) {

_cleanup_free_ char *p = NULL;

int r = 0;

assert(c);

if (isempty(c->zone)) {

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

r = -errno;

return r;

}

p = strappend("../usr/share/zoneinfo/", c->zone);

if (!p)

return log_oom();

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

if (r < 0)

return r;

return 0;

}

static int context_write_data_local_rtc(Context *c) {

int r;

_cleanup_free_ char *s = NULL, *w = NULL;

assert(c);

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

if (r < 0) {

if (r != -ENOENT)

return r;

if (!c->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)

return -EIO;

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

if (!p)

return -EIO;

p++;

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

if (!e)

return -EIO;

a = p - s;

b = strlen(e);

w = new(char, a + (c->local_rtc ? 5 : 3) + b + 1);

if (!w)

return -ENOMEM;

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

if (streq(w, NULL_ADJTIME_UTC)) {

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

if (errno != ENOENT)

return -errno;

return 0;

}

}

label_init("/etc");

return write_string_file_atomic_label("/etc/adjtime", w);

}

static int context_read_ntp(Context *c, sd_bus *bus) {

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

sd_bus_message *reply = NULL;

const char *s;

int r;

assert(c);

assert(bus);

r = sd_bus_call_method(

bus,

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"GetUnitFileState",

&error,

&reply,

"s",

"systemd-timesyncd.service");

if (r < 0) {

if (sd_bus_error_has_name(&error, SD_BUS_ERROR_FILE_NOT_FOUND) ||

sd_bus_error_has_name(&error, "org.freedesktop.systemd1.LoadFailed") ||

sd_bus_error_has_name(&error, "org.freedesktop.systemd1.NoSuchUnit"))

return 0;

return r;

}

r = sd_bus_message_read(reply, "s", &s);

if (r < 0)

return r;

c->can_ntp = true;

c->use_ntp = STR_IN_SET(s, "enabled", "enabled-runtime");

return 0;

}

static int context_start_ntp(Context *c, sd_bus *bus, sd_bus_error *error) {

int r;

assert(c);

assert(bus);

assert(error);

if (c->use_ntp)

r = sd_bus_call_method(

bus,

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"StartUnit",

error,

NULL,

"ss",

"systemd-timesyncd.service",

"replace");

else

r = sd_bus_call_method(

bus,

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"StopUnit",

error,

NULL,

"ss",

"systemd-timesyncd.service",

"replace");

if (r < 0) {

if (sd_bus_error_has_name(error, SD_BUS_ERROR_FILE_NOT_FOUND) ||

sd_bus_error_has_name(error, "org.freedesktop.systemd1.LoadFailed") ||

sd_bus_error_has_name(error, "org.freedesktop.systemd1.NoSuchUnit")) {

sd_bus_error_set_const(error, "org.freedesktop.timedate1.NoNTPSupport", "NTP not supported.");

return -ENOTSUP;

}

return r;

}

return 0;

}

static int context_enable_ntp(Context*c, sd_bus *bus, sd_bus_error *error) {

int r;

assert(c);

assert(bus);

assert(error);

if (c->use_ntp)

r = sd_bus_call_method(

bus,

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"EnableUnitFiles",

error,

NULL,

"asbb", 1,

"systemd-timesyncd.service",

false, true);

else

r = sd_bus_call_method(

bus,

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"DisableUnitFiles",

error,

NULL,

"asb", 1,

"systemd-timesyncd.service",

false);

if (r < 0) {

if (sd_bus_error_has_name(error, SD_BUS_ERROR_FILE_NOT_FOUND)) {

sd_bus_error_set_const(error, "org.freedesktop.timedate1.NoNTPSupport", "NTP not supported.");

return -ENOTSUP;

}

return r;

}

r = sd_bus_call_method(

bus,

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"Reload",

error,

NULL,

NULL);

if (r < 0)

return r;

return 0;

}

static int property_get_rtc_time(

sd_bus *bus,

const char *path,

const char *interface,

const char *property,

sd_bus_message *reply,

void *userdata,

sd_bus_error *error) {

struct tm tm;

usec_t t;

int r;

zero(tm);

r = clock_get_hwclock(&tm);

if (r == -EBUSY) {

log_warning("/dev/rtc is busy. Is somebody keeping it open continuously? That's not a good idea... Returning a bogus RTC timestamp.");

t = 0;

} else if (r == -ENOENT) {

log_debug("/dev/rtc not found.");

t = 0; /* no RTC found */

} else if (r < 0)

return sd_bus_error_set_errnof(error, r, "Failed to read RTC: %s", strerror(-r));

else

t = (usec_t) timegm(&tm) * USEC_PER_SEC;

return sd_bus_message_append(reply, "t", t);

}

static int property_get_time(

sd_bus *bus,

const char *path,

const char *interface,

const char *property,

sd_bus_message *reply,

void *userdata,

sd_bus_error *error) {

return sd_bus_message_append(reply, "t", now(CLOCK_REALTIME));

}

static int property_get_ntp_sync(

sd_bus *bus,

const char *path,

const char *interface,

const char *property,

sd_bus_message *reply,

void *userdata,

sd_bus_error *error) {

return sd_bus_message_append(reply, "b", ntp_synced());

}

static int method_set_timezone(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {

Context *c = userdata;

const char *z;

int interactive;

char *t;

int r;

assert(bus);

assert(m);

assert(c);

r = sd_bus_message_read(m, "sb", &z, &interactive);

if (r < 0)

return r;

if (!timezone_is_valid(z))

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid time zone '%s'", z);

if (streq_ptr(z, c->zone))

return sd_bus_reply_method_return(m, NULL);

r = bus_verify_polkit_async(bus, &c->polkit_registry, m, CAP_SYS_TIME, "org.freedesktop.timedate1.set-timezone", interactive, error, method_set_timezone, c);

if (r < 0)

return r;

if (r == 0)

return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */

t = strdup(z);

if (!t)

return -ENOMEM;

free(c->zone);

c->zone = t;

/* 1. Write new configuration file */

r = context_write_data_timezone(c);

if (r < 0) {

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

return sd_bus_error_set_errnof(error, r, "Failed to set time zone: %s", strerror(-r));

}

/* 2. Tell the kernel our timezone */

clock_set_timezone(NULL);

if (c->local_rtc) {

struct timespec ts;

struct tm *tm;

/* 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));

clock_set_hwclock(tm);

}

log_struct(LOG_INFO,

MESSAGE_ID(SD_MESSAGE_TIMEZONE_CHANGE),

"TIMEZONE=%s", c->zone,

"MESSAGE=Changed time zone to '%s'.", c->zone,

NULL);

sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "Timezone", NULL);

return sd_bus_reply_method_return(m, NULL);

}

static int method_set_local_rtc(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {

int lrtc, fix_system, interactive;

Context *c = userdata;

struct timespec ts;

int r;

assert(bus);

assert(m);

assert(c);

r = sd_bus_message_read(m, "bbb", &lrtc, &fix_system, &interactive);

if (r < 0)

return r;

if (lrtc == c->local_rtc)

return sd_bus_reply_method_return(m, NULL);

r = bus_verify_polkit_async(bus, &c->polkit_registry, m, CAP_SYS_TIME, "org.freedesktop.timedate1.set-local-rtc", interactive, error, method_set_local_rtc, c);

if (r < 0)

return r;

if (r == 0)

return 1;

c->local_rtc = lrtc;

/* 1. Write new configuration file */

r = context_write_data_local_rtc(c);

if (r < 0) {

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

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

}

/* 2. Tell the kernel our timezone */

clock_set_timezone(NULL);

/* 3. Synchronize clocks */

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

if (fix_system) {

struct tm tm;

/* Sync system clock from RTC; first,

if (c->local_rtc)

tm = *localtime(&ts.tv_sec);

else

tm = *gmtime(&ts.tv_sec);

/* Override the main fields of

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

/* And set the system clock

if (c->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 (c->local_rtc)

tm = localtime(&ts.tv_sec);

else

tm = gmtime(&ts.tv_sec);

clock_set_hwclock(tm);

}

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

sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "LocalRTC", NULL);

return sd_bus_reply_method_return(m, NULL);

}

static int method_set_time(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {

int relative, interactive;

Context *c = userdata;

int64_t utc;

struct timespec ts;

struct tm* tm;

int r;

assert(bus);

assert(m);

assert(c);

if (c->use_ntp)

return sd_bus_error_setf(error, BUS_ERROR_AUTOMATIC_TIME_SYNC_ENABLED, "Automatic time synchronization is enabled");

r = sd_bus_message_read(m, "xbb", &utc, &relative, &interactive);

if (r < 0)

return r;

if (!relative && utc <= 0)

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid absolute time");

if (relative && utc == 0)

return sd_bus_reply_method_return(m, NULL);

if (relative) {

usec_t n, x;

n = now(CLOCK_REALTIME);

x = n + utc;

if ((utc > 0 && x < n) ||

(utc < 0 && x > n))

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Time value overflow");

timespec_store(&ts, x);

} else

timespec_store(&ts, (usec_t) utc);

r = bus_verify_polkit_async(bus, &c->polkit_registry, m, CAP_SYS_TIME, "org.freedesktop.timedate1.set-time", interactive, error, method_set_time, c);

if (r < 0)

return r;

if (r == 0)

return 1;

/* Set system clock */

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

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

return sd_bus_error_set_errnof(error, errno, "Failed to set local time: %m");

}

/* Sync down to RTC */

if (c->local_rtc)

tm = localtime(&ts.tv_sec);

else

tm = gmtime(&ts.tv_sec);

clock_set_hwclock(tm);

log_struct(LOG_INFO,

MESSAGE_ID(SD_MESSAGE_TIME_CHANGE),

"REALTIME="USEC_FMT, timespec_load(&ts),

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

NULL);

return sd_bus_reply_method_return(m, NULL);

}

static int method_set_ntp(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {

int ntp, interactive;

Context *c = userdata;

int r;

r = sd_bus_message_read(m, "bb", &ntp, &interactive);

if (r < 0)

return r;

if ((bool)ntp == c->use_ntp)

return sd_bus_reply_method_return(m, NULL);

r = bus_verify_polkit_async(bus, &c->polkit_registry, m, CAP_SYS_TIME, "org.freedesktop.timedate1.set-ntp", interactive, error, method_set_ntp, c);

if (r < 0)

return r;

if (r == 0)

return 1;

c->use_ntp = ntp;

r = context_enable_ntp(c, bus, error);

if (r < 0)

return r;

r = context_start_ntp(c, bus, error);

if (r < 0)

return r;

log_info("Set NTP to %s", c->use_ntp ? "enabled" : "disabled");

sd_bus_emit_properties_changed(bus, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "NTP", NULL);

return sd_bus_reply_method_return(m, NULL);

}

static const sd_bus_vtable timedate_vtable[] = {

SD_BUS_VTABLE_START(0),

SD_BUS_PROPERTY("Timezone", "s", NULL, offsetof(Context, zone), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),

SD_BUS_PROPERTY("LocalRTC", "b", bus_property_get_bool, offsetof(Context, local_rtc), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),

SD_BUS_PROPERTY("CanNTP", "b", bus_property_get_bool, offsetof(Context, can_ntp), 0),

SD_BUS_PROPERTY("NTP", "b", bus_property_get_bool, offsetof(Context, use_ntp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),

SD_BUS_PROPERTY("NTPSynchronized", "b", property_get_ntp_sync, 0, 0),

SD_BUS_PROPERTY("TimeUSec", "t", property_get_time, 0, 0),

SD_BUS_PROPERTY("RTCTimeUSec", "t", property_get_rtc_time, 0, 0),

SD_BUS_METHOD("SetTime", "xbb", NULL, method_set_time, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("SetTimezone", "sb", NULL, method_set_timezone, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("SetLocalRTC", "bbb", NULL, method_set_local_rtc, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("SetNTP", "bb", NULL, method_set_ntp, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_VTABLE_END,

};

static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {

_cleanup_bus_close_unref_ sd_bus *bus = NULL;

int r;

assert(c);

assert(event);

assert(_bus);

r = sd_bus_default_system(&bus);

if (r < 0) {

log_error("Failed to get system bus connection: %s", strerror(-r));

return r;

}

r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", timedate_vtable, c);

if (r < 0) {

log_error("Failed to register object: %s", strerror(-r));

return r;

}

r = sd_bus_request_name(bus, "org.freedesktop.timedate1", 0);

if (r < 0) {

log_error("Failed to register name: %s", strerror(-r));

return r;

}

r = sd_bus_attach_event(bus, event, 0);

if (r < 0) {

log_error("Failed to attach bus to event loop: %s", strerror(-r));

return r;

}

*_bus = bus;

bus = NULL;

return 0;

}

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

Context context = {};

_cleanup_event_unref_ sd_event *event = NULL;

_cleanup_bus_close_unref_ sd_bus *bus = NULL;

int r;

log_set_target(LOG_TARGET_AUTO);

log_parse_environment();

log_open();

umask(0022);

if (argc != 1) {

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

r = -EINVAL;

goto finish;

}

r = sd_event_default(&event);

if (r < 0) {

log_error("Failed to allocate event loop: %s", strerror(-r));

goto finish;

}

sd_event_set_watchdog(event, true);

r = connect_bus(&context, event, &bus);

if (r < 0)

goto finish;

r = context_read_data(&context);

if (r < 0) {

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

goto finish;

}

r = context_read_ntp(&context, bus);

if (r < 0) {

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

goto finish;

}

r = bus_event_loop_with_idle(event, bus, "org.freedesktop.timedate1", DEFAULT_EXIT_USEC, NULL, NULL);

if (r < 0) {

log_error("Failed to run event loop: %s", strerror(-r));

goto finish;

}

finish:

context_free(&context, bus);

return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

}