diff options
Diffstat (limited to 'src/grp-timedate/systemd-timedated/timedated.c')
| -rw-r--r-- | src/grp-timedate/systemd-timedated/timedated.c | 747 |
1 files changed, 747 insertions, 0 deletions
diff --git a/src/grp-timedate/systemd-timedated/timedated.c b/src/grp-timedate/systemd-timedated/timedated.c new file mode 100644 index 0000000000..51a13fcf49 --- /dev/null +++ b/src/grp-timedate/systemd-timedated/timedated.c @@ -0,0 +1,747 @@ +/*** + 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 <systemd/sd-bus.h> +#include <systemd/sd-event.h> +#include <systemd/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(NULL) > 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; + 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; + } + } + + mac_selinux_init(); + 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; +} |