diff options
Diffstat (limited to 'src/timedate/timedated.c')
| -rw-r--r-- | src/timedate/timedated.c | 1168 |
1 files changed, 1168 insertions, 0 deletions
diff --git a/src/timedate/timedated.c b/src/timedate/timedated.c new file mode 100644 index 0000000..373574c --- /dev/null +++ b/src/timedate/timedated.c @@ -0,0 +1,1168 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> +#include <sys/stat.h> +#include <sys/timex.h> +#include <sys/types.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-get-properties.h" +#include "bus-locator.h" +#include "bus-log-control-api.h" +#include "bus-map-properties.h" +#include "bus-polkit.h" +#include "clock-util.h" +#include "conf-files.h" +#include "def.h" +#include "fd-util.h" +#include "fileio-label.h" +#include "fileio.h" +#include "fs-util.h" +#include "hashmap.h" +#include "list.h" +#include "main-func.h" +#include "memory-util.h" +#include "missing_capability.h" +#include "path-util.h" +#include "selinux-util.h" +#include "service-util.h" +#include "signal-util.h" +#include "string-util.h" +#include "strv.h" +#include "unit-def.h" +#include "unit-name.h" +#include "user-util.h" + +#define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n" +#define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n" + +#define UNIT_LIST_DIRS (const char* const*) CONF_PATHS_STRV("systemd/ntp-units.d") + +typedef struct UnitStatusInfo { + char *name; + char *load_state; + char *unit_file_state; + char *active_state; + char *path; + + LIST_FIELDS(struct UnitStatusInfo, units); +} UnitStatusInfo; + +typedef struct Context { + char *zone; + bool local_rtc; + Hashmap *polkit_registry; + sd_bus_message *cache; + + sd_bus_slot *slot_job_removed; + + LIST_HEAD(UnitStatusInfo, units); +} Context; + +#define log_unit_full_errno_zerook(unit, level, error, ...) \ + ({ \ + const UnitStatusInfo *_u = (unit); \ + _u ? log_object_internal(level, error, PROJECT_FILE, __LINE__, __func__, "UNIT=", _u->name, NULL, NULL, ##__VA_ARGS__) : \ + log_internal(level, error, PROJECT_FILE, __LINE__, __func__, ##__VA_ARGS__); \ + }) + +#define log_unit_full_errno(unit, level, error, ...) \ + ({ \ + int _error = (error); \ + ASSERT_NON_ZERO(_error); \ + log_unit_full_errno_zerook(unit, level, _error, ##__VA_ARGS__); \ + }) + +#define log_unit_full(unit, level, ...) (void) log_unit_full_errno_zerook(unit, level, 0, ##__VA_ARGS__) + +#define log_unit_debug(unit, ...) log_unit_full(unit, LOG_DEBUG, ##__VA_ARGS__) +#define log_unit_info(unit, ...) log_unit_full(unit, LOG_INFO, ##__VA_ARGS__) +#define log_unit_notice(unit, ...) log_unit_full(unit, LOG_NOTICE, ##__VA_ARGS__) +#define log_unit_warning(unit, ...) log_unit_full(unit, LOG_WARNING, ##__VA_ARGS__) +#define log_unit_error(unit, ...) log_unit_full(unit, LOG_ERR, ##__VA_ARGS__) + +#define log_unit_debug_errno(unit, error, ...) log_unit_full_errno(unit, LOG_DEBUG, error, ##__VA_ARGS__) +#define log_unit_info_errno(unit, error, ...) log_unit_full_errno(unit, LOG_INFO, error, ##__VA_ARGS__) +#define log_unit_notice_errno(unit, error, ...) log_unit_full_errno(unit, LOG_NOTICE, error, ##__VA_ARGS__) +#define log_unit_warning_errno(unit, error, ...) log_unit_full_errno(unit, LOG_WARNING, error, ##__VA_ARGS__) +#define log_unit_error_errno(unit, error, ...) log_unit_full_errno(unit, LOG_ERR, error, ##__VA_ARGS__) + +static void unit_status_info_clear(UnitStatusInfo *p) { + assert(p); + + p->load_state = mfree(p->load_state); + p->unit_file_state = mfree(p->unit_file_state); + p->active_state = mfree(p->active_state); +} + +static UnitStatusInfo *unit_status_info_free(UnitStatusInfo *p) { + if (!p) + return NULL; + + unit_status_info_clear(p); + free(p->name); + free(p->path); + return mfree(p); +} + +DEFINE_TRIVIAL_CLEANUP_FUNC(UnitStatusInfo*, unit_status_info_free); + +static void context_clear(Context *c) { + UnitStatusInfo *p; + + assert(c); + + free(c->zone); + bus_verify_polkit_async_registry_free(c->polkit_registry); + sd_bus_message_unref(c->cache); + + sd_bus_slot_unref(c->slot_job_removed); + + while ((p = c->units)) { + LIST_REMOVE(units, c->units, p); + unit_status_info_free(p); + } +} + +static int context_add_ntp_service(Context *c, const char *s, const char *source) { + _cleanup_(unit_status_info_freep) UnitStatusInfo *unit = NULL; + + assert(c); + assert(s); + assert(source); + + if (!unit_name_is_valid(s, UNIT_NAME_PLAIN)) + return -EINVAL; + + /* Do not add this if it is already listed */ + LIST_FOREACH(units, u, c->units) + if (streq(u->name, s)) + return 0; + + unit = new0(UnitStatusInfo, 1); + if (!unit) + return -ENOMEM; + + unit->name = strdup(s); + if (!unit->name) + return -ENOMEM; + + LIST_APPEND(units, c->units, unit); + log_unit_debug(unit, "added from %s.", source); + TAKE_PTR(unit); + + return 0; +} + +static int context_parse_ntp_services_from_environment(Context *c) { + const char *env, *p; + int r; + + assert(c); + + env = getenv("SYSTEMD_TIMEDATED_NTP_SERVICES"); + if (!env) + return 0; + + log_debug("Using list of ntp services from environment variable $SYSTEMD_TIMEDATED_NTP_SERVICES=%s.", env); + + for (p = env;;) { + _cleanup_free_ char *word = NULL; + + r = extract_first_word(&p, &word, ":", 0); + if (r == 0) + break; + if (r == -ENOMEM) + return log_oom(); + if (r < 0) { + log_error("Invalid syntax, ignoring: %s", env); + break; + } + + r = context_add_ntp_service(c, word, "$SYSTEMD_TIMEDATED_NTP_SERVICES"); + if (r < 0) + log_warning_errno(r, "Failed to add NTP service \"%s\", ignoring: %m", word); + } + + return 1; +} + +static int context_parse_ntp_services_from_disk(Context *c) { + _cleanup_strv_free_ char **files = NULL; + int r; + + r = conf_files_list_strv(&files, ".list", NULL, CONF_FILES_FILTER_MASKED, UNIT_LIST_DIRS); + if (r < 0) + return log_error_errno(r, "Failed to enumerate .list files: %m"); + + STRV_FOREACH(f, files) { + _cleanup_fclose_ FILE *file = NULL; + + log_debug("Reading file '%s'", *f); + + r = fopen_unlocked(*f, "re", &file); + if (r < 0) { + log_error_errno(r, "Failed to open %s, ignoring: %m", *f); + continue; + } + + for (;;) { + _cleanup_free_ char *line = NULL; + const char *word; + + r = read_line(file, LINE_MAX, &line); + if (r < 0) { + log_error_errno(r, "Failed to read %s, ignoring: %m", *f); + continue; + } + if (r == 0) + break; + + word = strstrip(line); + if (isempty(word) || startswith(word, "#")) + continue; + + r = context_add_ntp_service(c, word, *f); + if (r < 0) + log_warning_errno(r, "Failed to add NTP service \"%s\", ignoring: %m", word); + } + } + + return 1; +} + +static int context_parse_ntp_services(Context *c) { + int r; + + r = context_parse_ntp_services_from_environment(c); + if (r != 0) + return r; + + return context_parse_ntp_services_from_disk(c); +} + +static int context_ntp_service_is_active(Context *c) { + int count = 0; + + assert(c); + + /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */ + + LIST_FOREACH(units, info, c->units) + count += !STRPTR_IN_SET(info->active_state, "inactive", "failed"); + + return count; +} + +static int context_ntp_service_exists(Context *c) { + int count = 0; + + assert(c); + + /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */ + + LIST_FOREACH(units, info, c->units) + count += streq_ptr(info->load_state, "loaded"); + + return count; +} + +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_and_replace(c->zone, t); + + c->local_rtc = clock_is_localtime(NULL) > 0; + + return 0; +} + +static int context_write_data_timezone(Context *c) { + _cleanup_free_ char *p = NULL; + const char *source; + + assert(c); + + /* No timezone is very similar to UTC. Hence in either of these cases link the UTC file in. Except if + * it isn't installed, in which case we remove the symlink altogether. Since glibc defaults to an + * internal version of UTC in that case behaviour is mostly equivalent. We still prefer creating the + * symlink though, since things are more self explanatory then. */ + + if (isempty(c->zone) || streq(c->zone, "UTC")) { + + if (access("/usr/share/zoneinfo/UTC", F_OK) < 0) { + + if (unlink("/etc/localtime") < 0 && errno != ENOENT) + return -errno; + + return 0; + } + + source = "../usr/share/zoneinfo/UTC"; + } else { + p = path_join("../usr/share/zoneinfo", c->zone); + if (!p) + return -ENOMEM; + + source = p; + } + + return symlink_atomic(source, "/etc/localtime"); +} + +static int context_write_data_local_rtc(Context *c) { + _cleanup_free_ char *s = NULL, *w = NULL; + int r; + + 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; + const char *e = "\n"; /* default if there is less than 3 lines */ + const char *prepend = ""; + size_t a, b; + + p = strchrnul(s, '\n'); + if (*p == '\0') + /* only one line, no \n terminator */ + prepend = "\n0\n"; + else if (p[1] == '\0') { + /* only one line, with \n terminator */ + ++p; + prepend = "0\n"; + } else { + p = strchr(p+1, '\n'); + if (!p) { + /* only two lines, no \n terminator */ + prepend = "\n"; + p = s + strlen(s); + } else { + char *end; + /* third line might have a \n terminator or not */ + p++; + end = strchr(p, '\n'); + /* if we actually have a fourth line, use that as suffix "e", otherwise the default \n */ + if (end) + e = end; + } + } + + a = p - s; + b = strlen(e); + + w = new(char, a + (c->local_rtc ? 5 : 3) + strlen(prepend) + b + 1); + if (!w) + return -ENOMEM; + + *(char*) mempcpy(stpcpy(stpcpy(mempcpy(w, s, a), prepend), 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; + } + } + + r = mac_selinux_init(); + if (r < 0) + return r; + + return write_string_file_atomic_label("/etc/adjtime", w); +} + +static int context_update_ntp_status(Context *c, sd_bus *bus, sd_bus_message *m) { + static const struct bus_properties_map map[] = { + { "LoadState", "s", NULL, offsetof(UnitStatusInfo, load_state) }, + { "ActiveState", "s", NULL, offsetof(UnitStatusInfo, active_state) }, + { "UnitFileState", "s", NULL, offsetof(UnitStatusInfo, unit_file_state) }, + {} + }; + int r; + + assert(c); + assert(bus); + + /* Suppress calling context_update_ntp_status() multiple times within single DBus transaction. */ + if (m) { + if (m == c->cache) + return 0; + + sd_bus_message_unref(c->cache); + c->cache = sd_bus_message_ref(m); + } + + LIST_FOREACH(units, u, c->units) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_free_ char *path = NULL; + + unit_status_info_clear(u); + + path = unit_dbus_path_from_name(u->name); + if (!path) + return -ENOMEM; + + r = bus_map_all_properties( + bus, + "org.freedesktop.systemd1", + path, + map, + BUS_MAP_STRDUP, + &error, + NULL, + u); + if (r < 0) + return log_unit_error_errno(u, r, "Failed to get properties: %s", bus_error_message(&error, r)); + } + + return 0; +} + +static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) { + Context *c = ASSERT_PTR(userdata); + const char *path; + unsigned n = 0; + int r; + + assert(m); + + r = sd_bus_message_read(m, "uoss", NULL, &path, NULL, NULL); + if (r < 0) { + bus_log_parse_error(r); + return 0; + } + + LIST_FOREACH(units, u, c->units) + if (streq_ptr(path, u->path)) + u->path = mfree(u->path); + else + n += !!u->path; + + if (n == 0) { + c->slot_job_removed = sd_bus_slot_unref(c->slot_job_removed); + + (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), + "/org/freedesktop/timedate1", "org.freedesktop.timedate1", "NTP", + NULL); + } + + return 0; +} + +static int unit_start_or_stop(UnitStatusInfo *u, sd_bus *bus, sd_bus_error *error, bool start) { + _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; + const char *path; + int r; + + assert(u); + assert(bus); + assert(error); + + r = bus_call_method( + bus, + bus_systemd_mgr, + start ? "StartUnit" : "StopUnit", + error, + &reply, + "ss", + u->name, + "replace"); + log_unit_full_errno_zerook(u, r < 0 ? LOG_WARNING : LOG_DEBUG, r, + "%s unit: %m", start ? "Starting" : "Stopping"); + if (r < 0) + return r; + + r = sd_bus_message_read(reply, "o", &path); + if (r < 0) + return bus_log_parse_error(r); + + r = free_and_strdup(&u->path, path); + if (r < 0) + return log_oom(); + + return 0; +} + +static int unit_enable_or_disable(UnitStatusInfo *u, sd_bus *bus, sd_bus_error *error, bool enable) { + int r; + + assert(u); + assert(bus); + assert(error); + + /* Call context_update_ntp_status() to update UnitStatusInfo before calling this. */ + + if (streq(u->unit_file_state, "enabled") == enable) { + log_unit_debug(u, "already %sd.", enable_disable(enable)); + return 0; + } + + log_unit_info(u, "%s unit.", enable ? "Enabling" : "Disabling"); + + if (enable) + r = bus_call_method( + bus, + bus_systemd_mgr, + "EnableUnitFiles", + error, + NULL, + "asbb", 1, + u->name, + false, true); + else + r = bus_call_method( + bus, + bus_systemd_mgr, + "DisableUnitFiles", + error, + NULL, + "asb", 1, + u->name, + false); + if (r < 0) + return r; + + r = bus_call_method(bus, bus_systemd_mgr, "Reload", error, NULL, NULL); + if (r < 0) + return r; + + return 0; +} + +static bool ntp_synced(void) { + struct timex txc = {}; + + if (adjtimex(&txc) < 0) + return false; + + /* Consider the system clock synchronized if the reported maximum error is smaller than the maximum + * value (16 seconds). Ignore the STA_UNSYNC flag as it may have been set to prevent the kernel from + * touching the RTC. */ + return txc.maxerror < 16000000; +} + +static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_time, "t", now(CLOCK_REALTIME)); +static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_ntp_sync, "b", ntp_synced()); + +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 = 0; + int r; + + 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."); + else if (r == -ENOENT) + log_debug("/dev/rtc not 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_can_ntp( + sd_bus *bus, + const char *path, + const char *interface, + const char *property, + sd_bus_message *reply, + void *userdata, + sd_bus_error *error) { + + Context *c = ASSERT_PTR(userdata); + int r; + + assert(bus); + assert(property); + assert(reply); + assert(error); + + if (c->slot_job_removed) + /* When the previous request is not finished, then assume NTP is enabled. */ + return sd_bus_message_append(reply, "b", true); + + r = context_update_ntp_status(c, bus, reply); + if (r < 0) + return r; + + return sd_bus_message_append(reply, "b", context_ntp_service_exists(c) > 0); +} + +static int property_get_ntp( + sd_bus *bus, + const char *path, + const char *interface, + const char *property, + sd_bus_message *reply, + void *userdata, + sd_bus_error *error) { + + Context *c = ASSERT_PTR(userdata); + int r; + + assert(bus); + assert(property); + assert(reply); + assert(error); + + if (c->slot_job_removed) + /* When the previous request is not finished, then assume NTP is active. */ + return sd_bus_message_append(reply, "b", true); + + r = context_update_ntp_status(c, bus, reply); + if (r < 0) + return r; + + return sd_bus_message_append(reply, "b", context_ntp_service_is_active(c) > 0); +} + +static int method_set_timezone(sd_bus_message *m, void *userdata, sd_bus_error *error) { + Context *c = ASSERT_PTR(userdata); + int interactive, r; + const char *z; + + assert(m); + + r = sd_bus_message_read(m, "sb", &z, &interactive); + if (r < 0) + return r; + + if (!timezone_is_valid(z, LOG_DEBUG)) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid or not installed 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 */ + + r = free_and_strdup(&c->zone, z); + if (r < 0) + return r; + + /* 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. Make glibc notice the new timezone */ + tzset(); + + /* 3. Tell the kernel our timezone */ + r = clock_set_timezone(NULL); + if (r < 0) + log_debug_errno(r, "Failed to tell kernel about timezone, ignoring: %m"); + + if (c->local_rtc) { + struct timespec ts; + struct tm tm; + + /* 4. Sync RTC from system clock, with the new delta */ + assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0); + assert_se(localtime_r(&ts.tv_sec, &tm)); + + r = clock_set_hwclock(&tm); + if (r < 0) + log_debug_errno(r, "Failed to sync time to hardware clock, ignoring: %m"); + } + + log_struct(LOG_INFO, + "MESSAGE_ID=" SD_MESSAGE_TIMEZONE_CHANGE_STR, + "TIMEZONE=%s", c->zone, + "TIMEZONE_SHORTNAME=%s", tzname[daylight], + "DAYLIGHT=%i", daylight, + LOG_MESSAGE("Changed time zone to '%s' (%s).", c->zone, tzname[daylight])); + + (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 = ASSERT_PTR(userdata); + struct timespec ts; + int r; + + assert(m); + + r = sd_bus_message_read(m, "bbb", &lrtc, &fix_system, &interactive); + if (r < 0) + return r; + + if (lrtc == c->local_rtc && !fix_system) + 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; + + if (lrtc != c->local_rtc) { + 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 %s: %m", lrtc ? "local" : "UTC"); + return sd_bus_error_set_errnof(error, r, "Failed to set RTC to %s: %m", lrtc ? "local" : "UTC"); + } + } + + /* 2. Tell the kernel our timezone */ + r = clock_set_timezone(NULL); + if (r < 0) + log_debug_errno(r, "Failed to tell kernel about timezone, ignoring: %m"); + + /* 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. */ + localtime_or_gmtime_r(&ts.tv_sec, &tm, !c->local_rtc); + + /* Override the main fields of struct tm, but not the timezone fields */ + r = clock_get_hwclock(&tm); + if (r < 0) + log_debug_errno(r, "Failed to get hardware clock, ignoring: %m"); + else { + /* And set the system clock with this */ + ts.tv_sec = mktime_or_timegm(&tm, !c->local_rtc); + + if (clock_settime(CLOCK_REALTIME, &ts) < 0) + log_debug_errno(errno, "Failed to update system clock, ignoring: %m"); + } + + } else { + struct tm tm; + + /* Sync RTC from system clock */ + localtime_or_gmtime_r(&ts.tv_sec, &tm, !c->local_rtc); + + r = clock_set_hwclock(&tm); + if (r < 0) + log_debug_errno(r, "Failed to sync time to hardware clock, ignoring: %m"); + } + + 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) { + sd_bus *bus = sd_bus_message_get_bus(m); + char buf[FORMAT_TIMESTAMP_MAX]; + int relative, interactive, r; + Context *c = ASSERT_PTR(userdata); + int64_t utc; + struct timespec ts; + usec_t start; + struct tm tm; + + assert(m); + + if (c->slot_job_removed) + return sd_bus_error_set(error, BUS_ERROR_AUTOMATIC_TIME_SYNC_ENABLED, "Previous request is not finished, refusing."); + + r = context_update_ntp_status(c, bus, m); + if (r < 0) + return sd_bus_error_set_errnof(error, r, "Failed to update context: %m"); + + if (context_ntp_service_is_active(c) > 0) + return sd_bus_error_set(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_set(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_set(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 */ + localtime_or_gmtime_r(&ts.tv_sec, &tm, !c->local_rtc); + + r = clock_set_hwclock(&tm); + if (r < 0) + log_debug_errno(r, "Failed to update hardware clock, ignoring: %m"); + + log_struct(LOG_INFO, + "MESSAGE_ID=" SD_MESSAGE_TIME_CHANGE_STR, + "REALTIME="USEC_FMT, timespec_load(&ts), + LOG_MESSAGE("Changed local time to %s", strnull(format_timestamp(buf, sizeof(buf), timespec_load(&ts))))); + + return sd_bus_reply_method_return(m, NULL); +} + +static int method_set_ntp(sd_bus_message *m, void *userdata, sd_bus_error *error) { + _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *slot = NULL; + sd_bus *bus = sd_bus_message_get_bus(m); + Context *c = ASSERT_PTR(userdata); + const UnitStatusInfo *selected = NULL; + int enable, interactive, q, r; + + assert(m); + assert(bus); + + r = sd_bus_message_read(m, "bb", &enable, &interactive); + if (r < 0) + return r; + + r = context_update_ntp_status(c, bus, m); + if (r < 0) + return r; + + if (context_ntp_service_exists(c) <= 0) + return sd_bus_error_set(error, BUS_ERROR_NO_NTP_SUPPORT, "NTP not supported"); + + 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; + + /* This method may be called frequently. Forget the previous job if it has not completed yet. */ + LIST_FOREACH(units, u, c->units) + u->path = mfree(u->path); + + if (!c->slot_job_removed) { + r = bus_match_signal_async( + bus, + &slot, + bus_systemd_mgr, + "JobRemoved", + match_job_removed, NULL, c); + if (r < 0) + return r; + } + + if (enable) + LIST_FOREACH(units, u, c->units) { + bool enable_this_one = !selected; + + if (!streq(u->load_state, "loaded")) + continue; + + r = unit_enable_or_disable(u, bus, error, enable_this_one); + if (r < 0) + /* If enablement failed, don't start this unit. */ + enable_this_one = false; + + r = unit_start_or_stop(u, bus, error, enable_this_one); + if (r < 0) + log_unit_warning_errno(u, r, "Failed to %s %sd NTP unit, ignoring: %m", + enable_this_one ? "start" : "stop", + enable_disable(enable_this_one)); + if (enable_this_one) + selected = u; + } + else + LIST_FOREACH(units, u, c->units) { + if (!streq(u->load_state, "loaded")) + continue; + + q = unit_enable_or_disable(u, bus, error, false); + if (q < 0) + r = q; + + q = unit_start_or_stop(u, bus, error, false); + if (q < 0) + r = q; + } + + if (r < 0) + return r; + if (enable && !selected) + return log_error_errno(SYNTHETIC_ERRNO(ENOENT), "No NTP service found to enable."); + + if (slot) + c->slot_job_removed = TAKE_PTR(slot); + + if (selected) + log_info("Set NTP to enabled (%s).", selected->name); + else + log_info("Set NTP to disabled."); + + return sd_bus_reply_method_return(m, NULL); +} + +static int method_list_timezones(sd_bus_message *m, void *userdata, sd_bus_error *error) { + _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; + _cleanup_strv_free_ char **zones = NULL; + int r; + + assert(m); + + r = get_timezones(&zones); + if (r < 0) + return sd_bus_error_set_errnof(error, r, "Failed to read list of time zones: %m"); + + r = sd_bus_message_new_method_return(m, &reply); + if (r < 0) + return r; + + r = sd_bus_message_append_strv(reply, zones); + if (r < 0) + return r; + + return sd_bus_send(NULL, reply, 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", property_get_can_ntp, 0, 0), + SD_BUS_PROPERTY("NTP", "b", property_get_ntp, 0, 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_WITH_ARGS("SetTime", + SD_BUS_ARGS("x", usec_utc, "b", relative, "b", interactive), + SD_BUS_NO_RESULT, + method_set_time, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_ARGS("SetTimezone", + SD_BUS_ARGS("s", timezone, "b", interactive), + SD_BUS_NO_RESULT, + method_set_timezone, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_ARGS("SetLocalRTC", + SD_BUS_ARGS("b", local_rtc, "b", fix_system, "b", interactive), + SD_BUS_NO_RESULT, + method_set_local_rtc, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_ARGS("SetNTP", + SD_BUS_ARGS("b", use_ntp, "b", interactive), + SD_BUS_NO_RESULT, + method_set_ntp, + SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_ARGS("ListTimezones", + SD_BUS_NO_ARGS, + SD_BUS_RESULT("as", timezones), + method_list_timezones, + SD_BUS_VTABLE_UNPRIVILEGED), + + SD_BUS_VTABLE_END, +}; + +const BusObjectImplementation manager_object = { + "/org/freedesktop/timedate1", + "org.freedesktop.timedate1", + .vtables = BUS_VTABLES(timedate_vtable), +}; + +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 = bus_add_implementation(bus, &manager_object, c); + if (r < 0) + return r; + + r = bus_log_control_api_register(bus); + if (r < 0) + return r; + + r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.timedate1", 0, NULL, NULL); + if (r < 0) + return log_error_errno(r, "Failed to request 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 = TAKE_PTR(bus); + + return 0; +} + +static int run(int argc, char *argv[]) { + _cleanup_(context_clear) Context context = {}; + _cleanup_(sd_event_unrefp) sd_event *event = NULL; + _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; + int r; + + log_setup(); + + r = service_parse_argv("systemd-timedated.service", + "Manage the system clock and timezone and NTP enablement.", + BUS_IMPLEMENTATIONS(&manager_object, + &log_control_object), + argc, argv); + if (r <= 0) + return r; + + umask(0022); + + assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0); + + r = sd_event_default(&event); + if (r < 0) + return log_error_errno(r, "Failed to allocate event loop: %m"); + + (void) sd_event_set_watchdog(event, true); + + r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL); + if (r < 0) + return log_error_errno(r, "Failed to install SIGINT handler: %m"); + + r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL); + if (r < 0) + return log_error_errno(r, "Failed to install SIGTERM handler: %m"); + + r = connect_bus(&context, event, &bus); + if (r < 0) + return r; + + (void) sd_bus_negotiate_timestamp(bus, true); + + r = context_read_data(&context); + if (r < 0) + return log_error_errno(r, "Failed to read time zone data: %m"); + + r = context_parse_ntp_services(&context); + if (r < 0) + return r; + + r = bus_event_loop_with_idle(event, bus, "org.freedesktop.timedate1", DEFAULT_EXIT_USEC, NULL, NULL); + if (r < 0) + return log_error_errno(r, "Failed to run event loop: %m"); + + return 0; +} + +DEFINE_MAIN_FUNCTION(run); |