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Diffstat (limited to 'src/systemd-timedate/timedated.c')
-rw-r--r--src/systemd-timedate/timedated.c733
1 files changed, 733 insertions, 0 deletions
diff --git a/src/systemd-timedate/timedated.c b/src/systemd-timedate/timedated.c
new file mode 100644
index 0000000000..2a10135fba
--- /dev/null
+++ b/src/systemd-timedate/timedated.c
@@ -0,0 +1,733 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2011 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 <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "sd-bus.h"
+#include "sd-event.h"
+#include "sd-messages.h"
+
+#include "alloc-util.h"
+#include "bus-common-errors.h"
+#include "bus-error.h"
+#include "bus-util.h"
+#include "clock-util.h"
+#include "def.h"
+#include "fileio-label.h"
+#include "fs-util.h"
+#include "path-util.h"
+#include "selinux-util.h"
+#include "strv.h"
+#include "user-util.h"
+#include "util.h"
+
+#define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"
+#define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n"
+
+static BUS_ERROR_MAP_ELF_REGISTER const sd_bus_error_map timedated_errors[] = {
+ SD_BUS_ERROR_MAP("org.freedesktop.timedate1.NoNTPSupport", EOPNOTSUPP),
+ SD_BUS_ERROR_MAP_END
+};
+
+typedef struct Context {
+ char *zone;
+ bool local_rtc;
+ bool can_ntp;
+ bool use_ntp;
+ Hashmap *polkit_registry;
+} Context;
+
+static void context_free(Context *c) {
+ assert(c);
+
+ free(c->zone);
+ bus_verify_polkit_async_registry_free(c->polkit_registry);
+}
+
+static int context_read_data(Context *c) {
+ _cleanup_free_ char *t = NULL;
+ int r;
+
+ assert(c);
+
+ r = get_timezone(&t);
+ if (r == -EINVAL)
+ log_warning_errno(r, "/etc/localtime should be a symbolic link to a time zone data file in /usr/share/zoneinfo/.");
+ else if (r < 0)
+ log_warning_errno(r, "Failed to get target of /etc/localtime: %m");
+
+ free(c->zone);
+ c->zone = t;
+ t = 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;
+ }
+ }
+
+ mac_selinux_init("/etc");
+ return write_string_file_atomic_label("/etc/adjtime", w);
+}
+
+static int context_read_ntp(Context *c, sd_bus *bus) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_(sd_bus_message_unrefp) 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(sd_bus *bus, sd_bus_error *error, bool enabled) {
+ int r;
+
+ assert(bus);
+ assert(error);
+
+ r = sd_bus_call_method(
+ bus,
+ "org.freedesktop.systemd1",
+ "/org/freedesktop/systemd1",
+ "org.freedesktop.systemd1.Manager",
+ enabled ? "StartUnit" : "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"))
+ return sd_bus_error_set_const(error, "org.freedesktop.timedate1.NoNTPSupport", "NTP not supported.");
+
+ return r;
+ }
+
+ return 0;
+}
+
+static int context_enable_ntp(sd_bus *bus, sd_bus_error *error, bool enabled) {
+ int r;
+
+ assert(bus);
+ assert(error);
+
+ if (enabled)
+ 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))
+ return sd_bus_error_set_const(error, "org.freedesktop.timedate1.NoNTPSupport", "NTP not supported.");
+
+ 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: %m");
+ 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_message *m, void *userdata, sd_bus_error *error) {
+ Context *c = userdata;
+ const char *z;
+ int interactive;
+ char *t;
+ int r;
+
+ 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(
+ m,
+ CAP_SYS_TIME,
+ "org.freedesktop.timedate1.set-timezone",
+ NULL,
+ interactive,
+ UID_INVALID,
+ &c->polkit_registry,
+ error);
+ 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_errno(r, "Failed to set time zone: %m");
+ return sd_bus_error_set_errnof(error, r, "Failed to set time zone: %m");
+ }
+
+ /* 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,
+ LOG_MESSAGE_ID(SD_MESSAGE_TIMEZONE_CHANGE),
+ "TIMEZONE=%s", c->zone,
+ LOG_MESSAGE("Changed time zone to '%s'.", c->zone),
+ NULL);
+
+ (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "Timezone", NULL);
+
+ return sd_bus_reply_method_return(m, NULL);
+}
+
+static int method_set_local_rtc(sd_bus_message *m, void *userdata, sd_bus_error *error) {
+ int lrtc, fix_system, interactive;
+ Context *c = userdata;
+ struct timespec ts;
+ int r;
+
+ 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(
+ m,
+ CAP_SYS_TIME,
+ "org.freedesktop.timedate1.set-local-rtc",
+ NULL,
+ interactive,
+ UID_INVALID,
+ &c->polkit_registry,
+ error);
+ 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_errno(r, "Failed to set RTC to local/UTC: %m");
+ return sd_bus_error_set_errnof(error, r, "Failed to set RTC to local/UTC: %m");
+ }
+
+ /* 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,
+ * initialize the timezone fields of
+ * struct tm. */
+ if (c->local_rtc)
+ tm = *localtime(&ts.tv_sec);
+ else
+ tm = *gmtime(&ts.tv_sec);
+
+ /* Override the main fields of
+ * struct tm, but not the timezone
+ * fields */
+ if (clock_get_hwclock(&tm) >= 0) {
+
+ /* And set the system clock
+ * with this */
+ 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");
+
+ (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "LocalRTC", NULL);
+
+ return sd_bus_reply_method_return(m, NULL);
+}
+
+static int method_set_time(sd_bus_message *m, void *userdata, sd_bus_error *error) {
+ int relative, interactive;
+ Context *c = userdata;
+ int64_t utc;
+ struct timespec ts;
+ usec_t start;
+ struct tm* tm;
+ int r;
+
+ 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");
+
+ /* this only gets used if dbus does not provide a timestamp */
+ start = now(CLOCK_MONOTONIC);
+
+ 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(
+ m,
+ CAP_SYS_TIME,
+ "org.freedesktop.timedate1.set-time",
+ NULL,
+ interactive,
+ UID_INVALID,
+ &c->polkit_registry,
+ error);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return 1;
+
+ /* adjust ts for time spent in program */
+ r = sd_bus_message_get_monotonic_usec(m, &start);
+ /* when sd_bus_message_get_monotonic_usec() returns -ENODATA it does not modify &start */
+ if (r < 0 && r != -ENODATA)
+ return r;
+
+ timespec_store(&ts, timespec_load(&ts) + (now(CLOCK_MONOTONIC) - start));
+
+ /* Set system clock */
+ if (clock_settime(CLOCK_REALTIME, &ts) < 0) {
+ log_error_errno(errno, "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,
+ LOG_MESSAGE_ID(SD_MESSAGE_TIME_CHANGE),
+ "REALTIME="USEC_FMT, timespec_load(&ts),
+ LOG_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_message *m, void *userdata, sd_bus_error *error) {
+ int enabled, interactive;
+ Context *c = userdata;
+ int r;
+
+ assert(m);
+ assert(c);
+
+ r = sd_bus_message_read(m, "bb", &enabled, &interactive);
+ if (r < 0)
+ return r;
+
+ if ((bool)enabled == c->use_ntp)
+ return sd_bus_reply_method_return(m, NULL);
+
+ r = bus_verify_polkit_async(
+ m,
+ CAP_SYS_TIME,
+ "org.freedesktop.timedate1.set-ntp",
+ NULL,
+ interactive,
+ UID_INVALID,
+ &c->polkit_registry,
+ error);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return 1;
+
+ r = context_enable_ntp(sd_bus_message_get_bus(m), error, enabled);
+ if (r < 0)
+ return r;
+
+ r = context_start_ntp(sd_bus_message_get_bus(m), error, enabled);
+ if (r < 0)
+ return r;
+
+ c->use_ntp = enabled;
+ log_info("Set NTP to %s", enabled ? "enabled" : "disabled");
+
+ (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/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_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+ int r;
+
+ assert(c);
+ assert(event);
+ assert(_bus);
+
+ r = sd_bus_default_system(&bus);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get system bus connection: %m");
+
+ r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/timedate1", "org.freedesktop.timedate1", timedate_vtable, c);
+ if (r < 0)
+ return log_error_errno(r, "Failed to register object: %m");
+
+ r = sd_bus_request_name(bus, "org.freedesktop.timedate1", 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to register name: %m");
+
+ r = sd_bus_attach_event(bus, event, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to attach bus to event loop: %m");
+
+ *_bus = bus;
+ bus = NULL;
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ Context context = {};
+ _cleanup_(sd_event_unrefp) sd_event *event = NULL;
+ _cleanup_(sd_bus_flush_close_unrefp) 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_errno(r, "Failed to allocate event loop: %m");
+ goto finish;
+ }
+
+ sd_event_set_watchdog(event, true);
+
+ r = connect_bus(&context, event, &bus);
+ if (r < 0)
+ goto finish;
+
+ (void) sd_bus_negotiate_timestamp(bus, true);
+
+ r = context_read_data(&context);
+ if (r < 0) {
+ log_error_errno(r, "Failed to read time zone data: %m");
+ goto finish;
+ }
+
+ r = context_read_ntp(&context, bus);
+ if (r < 0) {
+ log_error_errno(r, "Failed to determine whether NTP is enabled: %m");
+ goto finish;
+ }
+
+ r = bus_event_loop_with_idle(event, bus, "org.freedesktop.timedate1", DEFAULT_EXIT_USEC, NULL, NULL);
+ if (r < 0) {
+ log_error_errno(r, "Failed to run event loop: %m");
+ goto finish;
+ }
+
+finish:
+ context_free(&context);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}