#include <stdlib.h>

#include <stdbool.h>

#include <unistd.h>

#include <getopt.h>

#include <locale.h>

#include <string.h>

#include <sys/timex.h>

#include "dbus-common.h"

#include "util.h"

#include "spawn-polkit-agent.h"

#include "build.h"

#include "hwclock.h"

#include "strv.h"

#include "pager.h"

#include "time-dst.h"

static bool arg_adjust_system_clock = false;

static bool arg_no_pager = false;

static enum transport {

TRANSPORT_NORMAL,

TRANSPORT_SSH,

TRANSPORT_POLKIT

} arg_transport = TRANSPORT_NORMAL;

static bool arg_ask_password = true;

static const char *arg_host = NULL;

static void pager_open_if_enabled(void) {

if (arg_no_pager)

return;

pager_open();

}

static void polkit_agent_open_if_enabled(void) {

/* Open the polkit agent as a child process if necessary */

if (!arg_ask_password)

return;

polkit_agent_open();

}

typedef struct StatusInfo {

const char *timezone;

bool local_rtc;

bool ntp;

} StatusInfo;

static bool ntp_synced(void) {

struct timex txc;

zero(txc);

if (adjtimex(&txc) < 0)

return false;

if (txc.status & STA_UNSYNC)

return false;

return true;

}

static const char *jump_str(int delta_minutes, char *s, size_t size) {

if (delta_minutes == 60)

return "one hour forward";

if (delta_minutes == -60)

return "one hour backwards";

if (delta_minutes < 0) {

snprintf(s, size, "%i minutes backwards", -delta_minutes);

return s;

}

if (delta_minutes > 0) {

snprintf(s, size, "%i minutes forward", delta_minutes);

return s;

}

return "";

}

static void print_status_info(StatusInfo *i) {

usec_t n;

char a[FORMAT_TIMESTAMP_MAX];

char b[FORMAT_TIMESTAMP_MAX];

char s[32];

struct tm tm;

time_t sec;

char *zc, *zn;

time_t t, tc, tn;

int dn;

bool is_dstc, is_dstn;

int r;

assert(i);

/* enforce the values of /etc/localtime */

if (getenv("TZ")) {

fprintf(stderr, "Warning: ignoring the TZ variable, reading the system's timezone setting only.\n\n");

unsetenv("TZ");

}

n = now(CLOCK_REALTIME);

sec = (time_t) (n / USEC_PER_SEC);

zero(tm);

assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&sec, &tm)) > 0);

char_array_0(a);

printf(" Local time: %s\n", a);

zero(tm);

assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S UTC", gmtime_r(&sec, &tm)) > 0);

char_array_0(a);

printf(" Universal time: %s\n", a);

zero(tm);

r = hwclock_get_time(&tm);

if (r >= 0) {

/* Calculcate the week-day */

mktime(&tm);

assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S", &tm) > 0);

char_array_0(a);

printf(" RTC time: %s\n", a);

}

zero(tm);

assert_se(strftime(a, sizeof(a), "%z", localtime_r(&sec, &tm)) > 0);

char_array_0(a);

printf(" Timezone: %s\n"

" UTC offset: %s\n"

" NTP enabled: %s\n"

"NTP synchronized: %s\n"

" RTC in local TZ: %s\n",

strna(i->timezone),

a,

yes_no(i->ntp),

yes_no(ntp_synced()),

yes_no(i->local_rtc));

r = time_get_dst(sec, "/etc/localtime",

&tc, &zc, &is_dstc,

&tn, &dn, &zn, &is_dstn);

if (r < 0)

printf(" DST active: n/a\n");

else {

printf(" DST active: %s\n", yes_no(is_dstc));

t = tc - 1;

zero(tm);

assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&t, &tm)) > 0);

char_array_0(a);

zero(tm);

assert_se(strftime(b, sizeof(b), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&tc, &tm)) > 0);

char_array_0(b);

printf(" Last DST change: %s → %s, DST became %s\n"

" %s\n"

" %s\n",

strna(zn), strna(zc), is_dstc ? "active" : "inactive", a, b);

t = tn - 1;

zero(tm);

assert_se(strftime(a, sizeof(a), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&t, &tm)) > 0);

char_array_0(a);

zero(tm);

assert_se(strftime(b, sizeof(b), "%a, %Y-%m-%d %H:%M:%S %Z", localtime_r(&tn, &tm)) > 0);

char_array_0(b);

printf(" Next DST change: %s → %s, DST will become %s, the clock will jump %s\n"

" %s\n"

" %s\n",

strna(zc), strna(zn), is_dstn ? "active" : "inactive", jump_str(dn, s, sizeof(s)), a, b);

free(zc);

free(zn);

}

if (i->local_rtc)

fputs("\n" ANSI_HIGHLIGHT_ON

"Warning: The RTC is configured to maintain time in the local time zone. This\n"

" mode is not fully supported and will create various problems with time\n"

" zone changes and daylight saving adjustments. If at all possible use\n"

" RTC in UTC, by calling 'timedatectl set-local-rtc 0'" ANSI_HIGHLIGHT_OFF ".\n", stdout);

}

static int status_property(const char *name, DBusMessageIter *iter, StatusInfo *i) {

assert(name);

assert(iter);

switch (dbus_message_iter_get_arg_type(iter)) {

case DBUS_TYPE_STRING: {

const char *s;

dbus_message_iter_get_basic(iter, &s);

if (!isempty(s)) {

if (streq(name, "Timezone"))

i->timezone = s;

}

break;

}

case DBUS_TYPE_BOOLEAN: {

dbus_bool_t b;

dbus_message_iter_get_basic(iter, &b);

if (streq(name, "LocalRTC"))

i->local_rtc = b;

else if (streq(name, "NTP"))

i->ntp = b;

}

}

return 0;

}

static int show_status(DBusConnection *bus, char **args, unsigned n) {

_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;

const char *interface = "";

int r;

DBusMessageIter iter, sub, sub2, sub3;

StatusInfo info;

assert(args);

r = bus_method_call_with_reply(

bus,

"org.freedesktop.timedate1",

"/org/freedesktop/timedate1",

"org.freedesktop.DBus.Properties",

"GetAll",

&reply,

NULL,

DBUS_TYPE_STRING, &interface,

DBUS_TYPE_INVALID);

if (r < 0)

return r;

if (!dbus_message_iter_init(reply, &iter) ||

dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||

dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_DICT_ENTRY) {

log_error("Failed to parse reply.");

return -EIO;

}

zero(info);

dbus_message_iter_recurse(&iter, &sub);

while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {

const char *name;

if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_DICT_ENTRY) {

log_error("Failed to parse reply.");

return -EIO;

}

dbus_message_iter_recurse(&sub, &sub2);

if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &name, true) < 0) {

log_error("Failed to parse reply.");

return -EIO;

}

if (dbus_message_iter_get_arg_type(&sub2) != DBUS_TYPE_VARIANT) {

log_error("Failed to parse reply.");

return -EIO;

}

dbus_message_iter_recurse(&sub2, &sub3);

r = status_property(name, &sub3, &info);

if (r < 0) {

log_error("Failed to parse reply.");

return r;

}

dbus_message_iter_next(&sub);

}

print_status_info(&info);

return 0;

}

static int set_time(DBusConnection *bus, char **args, unsigned n) {

_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;

dbus_bool_t relative = false, interactive = true;

usec_t t;

dbus_int64_t u;

int r;

assert(args);

assert(n == 2);

polkit_agent_open_if_enabled();

r = parse_timestamp(args[1], &t);

if (r < 0) {

log_error("Failed to parse time specification: %s", args[1]);

return r;

}

u = (dbus_uint64_t) t;

return bus_method_call_with_reply(

bus,

"org.freedesktop.timedate1",

"/org/freedesktop/timedate1",

"org.freedesktop.timedate1",

"SetTime",

&reply,

NULL,

DBUS_TYPE_INT64, &u,

DBUS_TYPE_BOOLEAN, &relative,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID);

}

static int set_timezone(DBusConnection *bus, char **args, unsigned n) {

_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;

dbus_bool_t interactive = true;

assert(args);

assert(n == 2);

polkit_agent_open_if_enabled();

return bus_method_call_with_reply(

bus,

"org.freedesktop.timedate1",

"/org/freedesktop/timedate1",

"org.freedesktop.timedate1",

"SetTimezone",

&reply,

NULL,

DBUS_TYPE_STRING, &args[1],

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID);

}

static int set_local_rtc(DBusConnection *bus, char **args, unsigned n) {

_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;

dbus_bool_t interactive = true, b, q;

int r;

assert(args);

assert(n == 2);

polkit_agent_open_if_enabled();

r = parse_boolean(args[1]);

if (r < 0) {

log_error("Failed to parse local RTC setting: %s", args[1]);

return r;

}

b = r;

q = arg_adjust_system_clock;

return bus_method_call_with_reply(

bus,

"org.freedesktop.timedate1",

"/org/freedesktop/timedate1",

"org.freedesktop.timedate1",

"SetLocalRTC",

&reply,

NULL,

DBUS_TYPE_BOOLEAN, &b,

DBUS_TYPE_BOOLEAN, &q,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID);

}

static int set_ntp(DBusConnection *bus, char **args, unsigned n) {

_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;

dbus_bool_t interactive = true, b;

int r;

assert(args);

assert(n == 2);

polkit_agent_open_if_enabled();

r = parse_boolean(args[1]);

if (r < 0) {

log_error("Failed to parse NTP setting: %s", args[1]);

return r;

}

b = r;

return bus_method_call_with_reply(

bus,

"org.freedesktop.timedate1",

"/org/freedesktop/timedate1",

"org.freedesktop.timedate1",

"SetNTP",

&reply,

NULL,

DBUS_TYPE_BOOLEAN, &b,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID);

}

static int list_timezones(DBusConnection *bus, char **args, unsigned n) {

_cleanup_fclose_ FILE *f = NULL;

_cleanup_strv_free_ char **zones = NULL;

size_t n_zones = 0;

char **i;

assert(args);

assert(n == 1);

f = fopen("/usr/share/zoneinfo/zone.tab", "re");

if (!f) {

log_error("Failed to open timezone database: %m");

return -errno;

}

for (;;) {

char l[LINE_MAX], *p, **z, *w;

size_t k;

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

if (feof(f))

break;

log_error("Failed to read timezone database: %m");

return -errno;

}

p = strstrip(l);

if (isempty(p) || *p == '#')

continue;

/* Skip over country code */

p += strcspn(p, WHITESPACE);

p += strspn(p, WHITESPACE);

/* Skip over coordinates */

p += strcspn(p, WHITESPACE);

p += strspn(p, WHITESPACE);

/* Found timezone name */

k = strcspn(p, WHITESPACE);

if (k <= 0)

continue;

w = strndup(p, k);

if (!w)

return log_oom();

z = realloc(zones, sizeof(char*) * (n_zones + 2));

if (!z) {

free(w);

return log_oom();

}

zones = z;

zones[n_zones++] = w;

}

if (zones)

zones[n_zones] = NULL;

pager_open_if_enabled();

strv_sort(zones);

STRV_FOREACH(i, zones)

puts(*i);

return 0;

}

static int help(void) {

printf("%s [OPTIONS...] COMMAND ...\n\n"

"Query or change system time and date settings.\n\n"

" -h --help Show this help\n"

" --version Show package version\n"

" --adjust-system-clock\n"

" Adjust system clock when changing local RTC mode\n"

" --no-pager Do not pipe output into a pager\n"

" --no-ask-password Do not prompt for password\n"

" -H --host=[USER@]HOST Operate on remote host\n\n"

"Commands:\n"

" status Show current time settings\n"

" set-time TIME Set system time\n"

" set-timezone ZONE Set system timezone\n"

" list-timezones Show known timezones\n"

" set-local-rtc BOOL Control whether RTC is in local time\n"

" set-ntp BOOL Control whether NTP is enabled\n",

program_invocation_short_name);

return 0;

}

static int parse_argv(int argc, char *argv[]) {

enum {

ARG_VERSION = 0x100,

ARG_NO_PAGER,

ARG_ADJUST_SYSTEM_CLOCK,

ARG_NO_ASK_PASSWORD

};

static const struct option options[] = {

{ "help", no_argument, NULL, 'h' },

{ "version", no_argument, NULL, ARG_VERSION },

{ "no-pager", no_argument, NULL, ARG_NO_PAGER },

{ "host", required_argument, NULL, 'H' },

{ "privileged", no_argument, NULL, 'P' },

{ "no-ask-password", no_argument, NULL, ARG_NO_ASK_PASSWORD },

{ "adjust-system-clock", no_argument, NULL, ARG_ADJUST_SYSTEM_CLOCK },

{ NULL, 0, NULL, 0 }

};

int c;

assert(argc >= 0);

assert(argv);

while ((c = getopt_long(argc, argv, "+hH:P", options, NULL)) >= 0) {

switch (c) {

case 'h':

help();

return 0;

case ARG_VERSION:

puts(PACKAGE_STRING);

puts(DISTRIBUTION);

puts(SYSTEMD_FEATURES);

return 0;

case 'P':

arg_transport = TRANSPORT_POLKIT;

break;

case 'H':

arg_transport = TRANSPORT_SSH;

arg_host = optarg;

break;

case ARG_ADJUST_SYSTEM_CLOCK:

arg_adjust_system_clock = true;

break;

case ARG_NO_PAGER:

arg_no_pager = true;

break;

case '?':

return -EINVAL;

default:

log_error("Unknown option code %c", c);

return -EINVAL;

}

}

return 1;

}

static int timedatectl_main(DBusConnection *bus, int argc, char *argv[], DBusError *error) {

static const struct {

const char* verb;

const enum {

MORE,

LESS,

EQUAL

} argc_cmp;

const int argc;

int (* const dispatch)(DBusConnection *bus, char **args, unsigned n);

} verbs[] = {

{ "status", LESS, 1, show_status },

{ "set-time", EQUAL, 2, set_time },

{ "set-timezone", EQUAL, 2, set_timezone },

{ "list-timezones", EQUAL, 1, list_timezones },

{ "set-local-rtc", EQUAL, 2, set_local_rtc },

{ "set-ntp", EQUAL, 2, set_ntp, },

};

int left;

unsigned i;

assert(argc >= 0);

assert(argv);

assert(error);

left = argc - optind;

if (left <= 0)

/* Special rule: no arguments means "status" */

i = 0;

else {

if (streq(argv[optind], "help")) {

help();

return 0;

}

for (i = 0; i < ELEMENTSOF(verbs); i++)

if (streq(argv[optind], verbs[i].verb))

break;

if (i >= ELEMENTSOF(verbs)) {

log_error("Unknown operation %s", argv[optind]);

return -EINVAL;

}

}

switch (verbs[i].argc_cmp) {

case EQUAL:

if (left != verbs[i].argc) {

log_error("Invalid number of arguments.");

return -EINVAL;

}

break;

case MORE:

if (left < verbs[i].argc) {

log_error("Too few arguments.");

return -EINVAL;

}

break;

case LESS:

if (left > verbs[i].argc) {

log_error("Too many arguments.");

return -EINVAL;

}

break;

default:

assert_not_reached("Unknown comparison operator.");

}

if (!bus) {

log_error("Failed to get D-Bus connection: %s", error->message);

return -EIO;

}

return verbs[i].dispatch(bus, argv + optind, left);

}

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

int r, retval = EXIT_FAILURE;

DBusConnection *bus = NULL;

DBusError error;

dbus_error_init(&error);

setlocale(LC_ALL, "");

log_parse_environment();

log_open();

r = parse_argv(argc, argv);

if (r < 0)

goto finish;

else if (r == 0) {

retval = EXIT_SUCCESS;

goto finish;

}

if (arg_transport == TRANSPORT_NORMAL)

bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);

else if (arg_transport == TRANSPORT_POLKIT)

bus_connect_system_polkit(&bus, &error);

else if (arg_transport == TRANSPORT_SSH)

bus_connect_system_ssh(NULL, arg_host, &bus, &error);

else

assert_not_reached("Uh, invalid transport...");

r = timedatectl_main(bus, argc, argv, &error);

retval = r < 0 ? EXIT_FAILURE : r;

finish:

if (bus) {

dbus_connection_flush(bus);

dbus_connection_close(bus);

dbus_connection_unref(bus);

}

dbus_error_free(&error);

dbus_shutdown();

pager_close();

return retval;

}