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Systemd/src/timedate/timedatectl.c

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/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
Copyright 2013 Kay Sievers
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <getopt.h>
#include <locale.h>
#include <stdbool.h>
#include <stdlib.h>
#include "sd-bus.h"
#include "bus-error.h"
#include "bus-util.h"
#include "pager.h"
#include "parse-util.h"
#include "spawn-polkit-agent.h"
#include "strv.h"
#include "terminal-util.h"
#include "util.h"
static bool arg_no_pager = false;
static bool arg_ask_password = true;
static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
static char *arg_host = NULL;
static bool arg_adjust_system_clock = false;
static void polkit_agent_open_if_enabled(void) {
/* Open the polkit agent as a child process if necessary */
if (!arg_ask_password)
return;
if (arg_transport != BUS_TRANSPORT_LOCAL)
return;
polkit_agent_open();
}
typedef struct StatusInfo {
usec_t time;
char *timezone;
usec_t rtc_time;
int rtc_local;
int ntp_enabled;
int ntp_capable;
int ntp_synced;
} StatusInfo;
static void status_info_clear(StatusInfo *info) {
if (info) {
free(info->timezone);
zero(*info);
}
}
static void print_status_info(const StatusInfo *i) {
char a[LINE_MAX];
struct tm tm;
time_t sec;
bool have_time = false;
const char *old_tz = NULL, *tz;
int r;
size_t n;
assert(i);
/* Save the old $TZ */
tz = getenv("TZ");
if (tz)
old_tz = strdupa(tz);
/* Set the new $TZ */
if (setenv("TZ", isempty(i->timezone) ? "UTC" : i->timezone, true) < 0)
log_warning_errno(errno, "Failed to set TZ environment variable, ignoring: %m");
else
tzset();
if (i->time != 0) {
sec = (time_t) (i->time / USEC_PER_SEC);
have_time = true;
} else if (IN_SET(arg_transport, BUS_TRANSPORT_LOCAL, BUS_TRANSPORT_MACHINE)) {
sec = time(NULL);
have_time = true;
} else
log_warning("Could not get time from timedated and not operating locally, ignoring.");
if (have_time) {
n = strftime(a, sizeof a, "%a %Y-%m-%d %H:%M:%S %Z", localtime_r(&sec, &tm));
printf(" Local time: %s\n", n > 0 ? a : "n/a");
n = strftime(a, sizeof a, "%a %Y-%m-%d %H:%M:%S UTC", gmtime_r(&sec, &tm));
printf(" Universal time: %s\n", n > 0 ? a : "n/a");
} else {
printf(" Local time: %s\n", "n/a");
printf(" Universal time: %s\n", "n/a");
}
if (i->rtc_time > 0) {
time_t rtc_sec;
rtc_sec = (time_t) (i->rtc_time / USEC_PER_SEC);
n = strftime(a, sizeof a, "%a %Y-%m-%d %H:%M:%S", gmtime_r(&rtc_sec, &tm));
printf(" RTC time: %s\n", n > 0 ? a : "n/a");
} else
printf(" RTC time: %s\n", "n/a");
if (have_time)
n = strftime(a, sizeof a, "%Z, %z", localtime_r(&sec, &tm));
/* Restore the $TZ */
if (old_tz)
r = setenv("TZ", old_tz, true);
else
r = unsetenv("TZ");
if (r < 0)
log_warning_errno(errno, "Failed to set TZ environment variable, ignoring: %m");
else
tzset();
printf(" Time zone: %s (%s)\n"
" System clock synchronized: %s\n"
"systemd-timesyncd.service active: %s\n"
" RTC in local TZ: %s\n",
strna(i->timezone), have_time && n > 0 ? a : "n/a",
i->ntp_capable ? yes_no(i->ntp_enabled) : "n/a",
yes_no(i->ntp_synced),
yes_no(i->rtc_local));
if (i->rtc_local)
printf("\n%s"
"Warning: The system is configured to read the RTC time in the local time zone.\n"
" This mode can not be fully supported. It will create various problems\n"
" with time zone changes and daylight saving time adjustments. The RTC\n"
" time is never updated, it relies on external facilities to maintain it.\n"
" If at all possible, use RTC in UTC by calling\n"
" 'timedatectl set-local-rtc 0'.%s\n", ansi_highlight(), ansi_normal());
}
static int show_status(sd_bus *bus, char **args, unsigned n) {
_cleanup_(status_info_clear) StatusInfo info = {};
static const struct bus_properties_map map[] = {
{ "Timezone", "s", NULL, offsetof(StatusInfo, timezone) },
{ "LocalRTC", "b", NULL, offsetof(StatusInfo, rtc_local) },
{ "NTP", "b", NULL, offsetof(StatusInfo, ntp_enabled) },
{ "CanNTP", "b", NULL, offsetof(StatusInfo, ntp_capable) },
{ "NTPSynchronized", "b", NULL, offsetof(StatusInfo, ntp_synced) },
{ "TimeUSec", "t", NULL, offsetof(StatusInfo, time) },
{ "RTCTimeUSec", "t", NULL, offsetof(StatusInfo, rtc_time) },
{}
};
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(bus);
r = bus_map_all_properties(bus,
"org.freedesktop.timedate1",
"/org/freedesktop/timedate1",
map,
&error,
&info);
if (r < 0)
return log_error_errno(r, "Failed to query server: %s", bus_error_message(&error, r));
print_status_info(&info);
return r;
}
static int set_time(sd_bus *bus, char **args, unsigned n) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
bool relative = false, interactive = arg_ask_password;
usec_t t;
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;
}
r = sd_bus_call_method(bus,
"org.freedesktop.timedate1",
"/org/freedesktop/timedate1",
"org.freedesktop.timedate1",
"SetTime",
&error,
NULL,
"xbb", (int64_t)t, relative, interactive);
if (r < 0)
log_error("Failed to set time: %s", bus_error_message(&error, -r));
return r;
}
static int set_timezone(sd_bus *bus, char **args, unsigned n) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r;
assert(args);
assert(n == 2);
polkit_agent_open_if_enabled();
r = sd_bus_call_method(bus,
"org.freedesktop.timedate1",
"/org/freedesktop/timedate1",
"org.freedesktop.timedate1",
"SetTimezone",
&error,
NULL,
"sb", args[1], arg_ask_password);
if (r < 0)
log_error("Failed to set time zone: %s", bus_error_message(&error, -r));
return r;
}
static int set_local_rtc(sd_bus *bus, char **args, unsigned n) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int r, b;
assert(args);
assert(n == 2);
polkit_agent_open_if_enabled();
b = parse_boolean(args[1]);
if (b < 0) {
log_error("Failed to parse local RTC setting: %s", args[1]);
return b;
}
r = sd_bus_call_method(bus,
"org.freedesktop.timedate1",
"/org/freedesktop/timedate1",
"org.freedesktop.timedate1",
"SetLocalRTC",
&error,
NULL,
"bbb", b, arg_adjust_system_clock, arg_ask_password);
if (r < 0)
log_error("Failed to set local RTC: %s", bus_error_message(&error, -r));
return r;
}
static int set_ntp(sd_bus *bus, char **args, unsigned n) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
int b, r;
assert(args);
assert(n == 2);
polkit_agent_open_if_enabled();
b = parse_boolean(args[1]);
if (b < 0) {
log_error("Failed to parse NTP setting: %s", args[1]);
return b;
}
r = sd_bus_call_method(bus,
"org.freedesktop.timedate1",
"/org/freedesktop/timedate1",
"org.freedesktop.timedate1",
"SetNTP",
&error,
NULL,
"bb", b, arg_ask_password);
if (r < 0)
log_error("Failed to set ntp: %s", bus_error_message(&error, -r));
return r;
}
static int list_timezones(sd_bus *bus, char **args, unsigned n) {
_cleanup_strv_free_ char **zones = NULL;
int r;
assert(args);
assert(n == 1);
r = get_timezones(&zones);
if (r < 0)
return log_error_errno(r, "Failed to read list of time zones: %m");
pager_open(arg_no_pager, false);
strv_print(zones);
return 0;
}
static void help(void) {
printf("%s [OPTIONS...] COMMAND ...\n\n"
"Query or change system time and date settings.\n\n"
" -h --help Show this help message\n"
" --version Show package version\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"
" -M --machine=CONTAINER Operate on local container\n"
" --adjust-system-clock Adjust system clock when changing local RTC mode\n\n"
"Commands:\n"
" status Show current time settings\n"
" set-time TIME Set system time\n"
" set-timezone ZONE Set system time zone\n"
" list-timezones Show known time zones\n"
" set-local-rtc BOOL Control whether RTC is in local time\n"
" set-ntp BOOL Enable or disable network time synchronization\n",
program_invocation_short_name);
}
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' },
{ "machine", required_argument, NULL, 'M' },
{ "no-ask-password", no_argument, NULL, ARG_NO_ASK_PASSWORD },
{ "adjust-system-clock", no_argument, NULL, ARG_ADJUST_SYSTEM_CLOCK },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hH:M:", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
return version();
case 'H':
arg_transport = BUS_TRANSPORT_REMOTE;
arg_host = optarg;
break;
case 'M':
arg_transport = BUS_TRANSPORT_MACHINE;
arg_host = optarg;
break;
case ARG_NO_ASK_PASSWORD:
arg_ask_password = false;
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:
assert_not_reached("Unhandled option");
}
return 1;
}
static int timedatectl_main(sd_bus *bus, int argc, char *argv[]) {
static const struct {
const char* verb;
const enum {
MORE,
LESS,
EQUAL
} argc_cmp;
const int argc;
int (* const dispatch)(sd_bus *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);
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.");
}
return verbs[i].dispatch(bus, argv + optind, left);
}
int main(int argc, char *argv[]) {
sd_bus *bus = NULL;
int r;
setlocale(LC_ALL, "");
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
r = bus_connect_transport(arg_transport, arg_host, false, &bus);
if (r < 0) {
log_error_errno(r, "Failed to create bus connection: %m");
goto finish;
}
r = timedatectl_main(bus, argc, argv);
finish:
sd_bus_flush_close_unref(bus);
pager_close();
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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