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Systemd/src/timedate/timedatectl.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
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 <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, %z", localtime_r(&sec, &tm)) > 0);
char_array_0(a);
printf(" Timezone: %s (%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: DST %s at\n"
" %s\n"
" %s\n",
is_dstc ? "began" : "ended", 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: DST %s (the clock jumps %s) at\n"
" %s\n"
" %s\n",
is_dstn ? "begins" : "ends", 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;
}
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