src/timedate/timedated.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <dbus/dbus.h>
  23
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include "systemd/sd-id128.h"
  29 #include "systemd/sd-messages.h"
  30 #include "util.h"
  31 #include "strv.h"
  32 #include "dbus-common.h"
  33 #include "polkit.h"
  34 #include "def.h"
  35 #include "hwclock.h"
  36 #include "conf-files.h"
  37
  38 #define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"
  39 #define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n"
  40
  41 #define INTERFACE                                                       \
  42         " <interface name=\"org.freedesktop.timedate1\">\n"             \
  43         "  <property name=\"Timezone\" type=\"s\" access=\"read\"/>\n"  \
  44         "  <property name=\"LocalRTC\" type=\"b\" access=\"read\"/>\n"  \
  45         "  <property name=\"NTP\" type=\"b\" access=\"read\"/>\n"       \
  46         "  <method name=\"SetTime\">\n"                                 \
  47         "   <arg name=\"usec_utc\" type=\"x\" direction=\"in\"/>\n"     \
  48         "   <arg name=\"relative\" type=\"b\" direction=\"in\"/>\n"     \
  49         "   <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
  50         "  </method>\n"                                                 \
  51         "  <method name=\"SetTimezone\">\n"                             \
  52         "   <arg name=\"timezone\" type=\"s\" direction=\"in\"/>\n"     \
  53         "   <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
  54         "  </method>\n"                                                 \
  55         "  <method name=\"SetLocalRTC\">\n"                             \
  56         "   <arg name=\"local_rtc\" type=\"b\" direction=\"in\"/>\n"    \
  57         "   <arg name=\"fix_system\" type=\"b\" direction=\"in\"/>\n"   \
  58         "   <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
  59         "  </method>\n"                                                 \
  60         "  <method name=\"SetNTP\">\n"                                  \
  61         "   <arg name=\"use_ntp\" type=\"b\" direction=\"in\"/>\n"      \
  62         "   <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
  63         "  </method>\n"                                                 \
  64         " </interface>\n"
  65
  66 #define INTROSPECTION                                                   \
  67         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  68         "<node>\n"                                                      \
  69         INTERFACE                                                       \
  70         BUS_PROPERTIES_INTERFACE                                        \
  71         BUS_INTROSPECTABLE_INTERFACE                                    \
  72         BUS_PEER_INTERFACE                                              \
  73         "</node>\n"
  74
  75 #define INTERFACES_LIST                         \
  76         BUS_GENERIC_INTERFACES_LIST             \
  77         "org.freedesktop.timedate1\0"
  78
  79 const char timedate_interface[] _introspect_("timedate1") = INTERFACE;
  80
  81 typedef struct TZ {
  82         char *zone;
  83         bool local_rtc;
  84         int use_ntp;
  85 } TZ;
  86
  87 static TZ tz = {
  88         .use_ntp = -1,
  89 };
  90
  91 static usec_t remain_until;
  92
  93 static void free_data(void) {
  94         free(tz.zone);
  95         tz.zone = NULL;
  96
  97         tz.local_rtc = false;
  98 }
  99
 100 static bool valid_timezone(const char *name) {
 101         const char *p;
 102         char *t;
 103         bool slash = false;
 104         int r;
 105         struct stat st;
 106
 107         assert(name);
 108
 109         if (*name == '/' || *name == 0)
 110                 return false;
 111
 112         for (p = name; *p; p++) {
 113                 if (!(*p >= '0' && *p <= '9') &&
 114                     !(*p >= 'a' && *p <= 'z') &&
 115                     !(*p >= 'A' && *p <= 'Z') &&
 116                     !(*p == '-' || *p == '_' || *p == '+' || *p == '/'))
 117                         return false;
 118
 119                 if (*p == '/') {
 120
 121                         if (slash)
 122                                 return false;
 123
 124                         slash = true;
 125                 } else
 126                         slash = false;
 127         }
 128
 129         if (slash)
 130                 return false;
 131
 132         t = strappend("/usr/share/zoneinfo/", name);
 133         if (!t)
 134                 return false;
 135
 136         r = stat(t, &st);
 137         free(t);
 138
 139         if (r < 0)
 140                 return false;
 141
 142         if (!S_ISREG(st.st_mode))
 143                 return false;
 144
 145         return true;
 146 }
 147
 148 static void verify_timezone(void) {
 149         char *p, *a = NULL, *b = NULL;
 150         size_t l, q;
 151         int j, k;
 152
 153         if (!tz.zone)
 154                 return;
 155
 156         p = strappend("/usr/share/zoneinfo/", tz.zone);
 157         if (!p) {
 158                 log_oom();
 159                 return;
 160         }
 161
 162         j = read_full_file("/etc/localtime", &a, &l);
 163         k = read_full_file(p, &b, &q);
 164
 165         free(p);
 166
 167         if (j < 0 || k < 0 || l != q || memcmp(a, b, l)) {
 168                 log_warning("/etc/localtime and /etc/timezone out of sync.");
 169                 free(tz.zone);
 170                 tz.zone = NULL;
 171         }
 172
 173         free(a);
 174         free(b);
 175 }
 176
 177 static int read_data(void) {
 178         int r;
 179
 180         free_data();
 181
 182         r = read_one_line_file("/etc/timezone", &tz.zone);
 183         if (r < 0) {
 184                 if (r != -ENOENT)
 185                         log_warning("Failed to read /etc/timezone: %s", strerror(-r));
 186
 187 #ifdef TARGET_FEDORA
 188                 r = parse_env_file("/etc/sysconfig/clock", NEWLINE,
 189                                    "ZONE", &tz.zone,
 190                                    NULL);
 191
 192                 if (r < 0 && r != -ENOENT)
 193                         log_warning("Failed to read /etc/sysconfig/clock: %s", strerror(-r));
 194 #endif
 195         }
 196
 197         if (isempty(tz.zone)) {
 198                 free(tz.zone);
 199                 tz.zone = NULL;
 200         }
 201
 202         verify_timezone();
 203
 204         tz.local_rtc = hwclock_is_localtime() > 0;
 205
 206         return 0;
 207 }
 208
 209 static int write_data_timezone(void) {
 210         int r = 0;
 211         char *p;
 212
 213         if (!tz.zone) {
 214                 if (unlink("/etc/timezone") < 0 && errno != ENOENT)
 215                         r = -errno;
 216
 217                 if (unlink("/etc/localtime") < 0 && errno != ENOENT)
 218                         r = -errno;
 219
 220                 return r;
 221         }
 222
 223         p = strappend("/usr/share/zoneinfo/", tz.zone);
 224         if (!p)
 225                 return log_oom();
 226
 227         r = symlink_or_copy_atomic(p, "/etc/localtime");
 228         free(p);
 229
 230         if (r < 0)
 231                 return r;
 232
 233         r = write_one_line_file_atomic("/etc/timezone", tz.zone);
 234         if (r < 0)
 235                 return r;
 236
 237         return 0;
 238 }
 239
 240 static int write_data_local_rtc(void) {
 241         int r;
 242         char *s, *w;
 243
 244         r = read_full_file("/etc/adjtime", &s, NULL);
 245         if (r < 0) {
 246                 if (r != -ENOENT)
 247                         return r;
 248
 249                 if (!tz.local_rtc)
 250                         return 0;
 251
 252                 w = strdup(NULL_ADJTIME_LOCAL);
 253                 if (!w)
 254                         return -ENOMEM;
 255         } else {
 256                 char *p, *e;
 257                 size_t a, b;
 258
 259                 p = strchr(s, '\n');
 260                 if (!p) {
 261                         free(s);
 262                         return -EIO;
 263                 }
 264
 265                 p = strchr(p+1, '\n');
 266                 if (!p) {
 267                         free(s);
 268                         return -EIO;
 269                 }
 270
 271                 p++;
 272                 e = strchr(p, '\n');
 273                 if (!e) {
 274                         free(s);
 275                         return -EIO;
 276                 }
 277
 278                 a = p - s;
 279                 b = strlen(e);
 280
 281                 w = new(char, a + (tz.local_rtc ? 5 : 3) + b + 1);
 282                 if (!w) {
 283                         free(s);
 284                         return -ENOMEM;
 285                 }
 286
 287                 *(char*) mempcpy(stpcpy(mempcpy(w, s, a), tz.local_rtc ? "LOCAL" : "UTC"), e, b) = 0;
 288
 289                 if (streq(w, NULL_ADJTIME_UTC)) {
 290                         free(w);
 291
 292                         if (unlink("/etc/adjtime") < 0) {
 293                                 if (errno != ENOENT)
 294                                         return -errno;
 295                         }
 296
 297                         return 0;
 298                 }
 299         }
 300
 301         r = write_one_line_file_atomic("/etc/adjtime", w);
 302         free(w);
 303
 304         return r;
 305 }
 306
 307 static char** get_ntp_services(void) {
 308         char **r = NULL, **files, **i;
 309         int k;
 310
 311         k = conf_files_list(&files, ".list",
 312                             "/etc/systemd/ntp-units.d",
 313                             "/run/systemd/ntp-units.d",
 314                             "/usr/local/lib/systemd/ntp-units.d",
 315                             "/usr/lib/systemd/ntp-units.d",
 316                             NULL);
 317         if (k < 0)
 318                 return NULL;
 319
 320         STRV_FOREACH(i, files) {
 321                 FILE *f;
 322
 323                 f = fopen(*i, "re");
 324                 if (!f)
 325                         continue;
 326
 327                 for (;;) {
 328                         char line[PATH_MAX], *l, **q;
 329
 330                         if (!fgets(line, sizeof(line), f)) {
 331
 332                                 if (ferror(f))
 333                                         log_error("Failed to read NTP units file: %m");
 334
 335                                 break;
 336                         }
 337
 338                         l = strstrip(line);
 339                         if (l[0] == 0 || l[0] == '#')
 340                                 continue;
 341
 342                         q = strv_append(r, l);
 343                         if (!q) {
 344                                 log_oom();
 345                                 break;
 346                         }
 347
 348                         strv_free(r);
 349                         r = q;
 350                 }
 351
 352                 fclose(f);
 353         }
 354
 355         strv_free(files);
 356
 357         return strv_uniq(r);
 358 }
 359
 360 static int read_ntp(DBusConnection *bus) {
 361         DBusMessage *m = NULL, *reply = NULL;
 362         DBusError error;
 363         int r;
 364         char **i, **l;
 365
 366         assert(bus);
 367
 368         dbus_error_init(&error);
 369
 370         l = get_ntp_services();
 371         STRV_FOREACH(i, l) {
 372                 const char *s;
 373
 374                 if (m)
 375                         dbus_message_unref(m);
 376                 m = dbus_message_new_method_call(
 377                                 "org.freedesktop.systemd1",
 378                                 "/org/freedesktop/systemd1",
 379                                 "org.freedesktop.systemd1.Manager",
 380                                 "GetUnitFileState");
 381                 if (!m) {
 382                         r = log_oom();
 383                         goto finish;
 384                 }
 385
 386                 if (!dbus_message_append_args(m,
 387                                               DBUS_TYPE_STRING, i,
 388                                               DBUS_TYPE_INVALID)) {
 389                         r = log_oom();
 390                         goto finish;
 391                 }
 392
 393                 if (reply)
 394                         dbus_message_unref(reply);
 395                 reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
 396                 if (!reply) {
 397                         if (streq(error.name, "org.freedesktop.DBus.Error.FileNotFound")) {
 398                                 /* This implementation does not exist, try next one */
 399                                 dbus_error_free(&error);
 400                                 continue;
 401                         }
 402
 403                         log_error("Failed to issue method call: %s", bus_error_message(&error));
 404                         r = -EIO;
 405                         goto finish;
 406                 }
 407
 408                 if (!dbus_message_get_args(reply, &error,
 409                                            DBUS_TYPE_STRING, &s,
 410                                            DBUS_TYPE_INVALID)) {
 411                         log_error("Failed to parse reply: %s", bus_error_message(&error));
 412                         r = -EIO;
 413                         goto finish;
 414                 }
 415
 416                 tz.use_ntp =
 417                         streq(s, "enabled") ||
 418                         streq(s, "enabled-runtime");
 419                 r = 0;
 420                 goto finish;
 421         }
 422
 423         /* NTP is not installed. */
 424         tz.use_ntp = 0;
 425         r = 0;
 426
 427 finish:
 428         if (m)
 429                 dbus_message_unref(m);
 430
 431         if (reply)
 432                 dbus_message_unref(reply);
 433
 434         strv_free(l);
 435
 436         dbus_error_free(&error);
 437
 438         return r;
 439 }
 440
 441 static int start_ntp(DBusConnection *bus, DBusError *error) {
 442         DBusMessage *m = NULL, *reply = NULL;
 443         const char *mode = "replace";
 444         char **i, **l;
 445         int r;
 446
 447         assert(bus);
 448         assert(error);
 449
 450         l = get_ntp_services();
 451         STRV_FOREACH(i, l) {
 452                 if (m)
 453                         dbus_message_unref(m);
 454                 m = dbus_message_new_method_call(
 455                                 "org.freedesktop.systemd1",
 456                                 "/org/freedesktop/systemd1",
 457                                 "org.freedesktop.systemd1.Manager",
 458                                 tz.use_ntp ? "StartUnit" : "StopUnit");
 459                 if (!m) {
 460                         log_error("Could not allocate message.");
 461                         r = -ENOMEM;
 462                         goto finish;
 463                 }
 464
 465                 if (!dbus_message_append_args(m,
 466                                               DBUS_TYPE_STRING, i,
 467                                               DBUS_TYPE_STRING, &mode,
 468                                               DBUS_TYPE_INVALID)) {
 469                         log_error("Could not append arguments to message.");
 470                         r = -ENOMEM;
 471                         goto finish;
 472                 }
 473
 474                 if (reply)
 475                         dbus_message_unref(reply);
 476                 reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);
 477                 if (!reply) {
 478                         if (streq(error->name, "org.freedesktop.DBus.Error.FileNotFound") ||
 479                             streq(error->name, "org.freedesktop.systemd1.LoadFailed") ||
 480                             streq(error->name, "org.freedesktop.systemd1.NoSuchUnit")) {
 481                                 /* This implementation does not exist, try next one */
 482                                 dbus_error_free(error);
 483                                 continue;
 484                         }
 485
 486                         log_error("Failed to issue method call: %s", bus_error_message(error));
 487                         r = -EIO;
 488                         goto finish;
 489                 }
 490
 491                 r = 0;
 492                 goto finish;
 493         }
 494
 495         /* No implementaiton available... */
 496         r = -ENOENT;
 497
 498 finish:
 499         if (m)
 500                 dbus_message_unref(m);
 501
 502         if (reply)
 503                 dbus_message_unref(reply);
 504
 505         strv_free(l);
 506
 507         return r;
 508 }
 509
 510 static int enable_ntp(DBusConnection *bus, DBusError *error) {
 511         DBusMessage *m = NULL, *reply = NULL;
 512         int r;
 513         DBusMessageIter iter;
 514         dbus_bool_t f = FALSE, t = TRUE;
 515         char **i, **l;
 516
 517         assert(bus);
 518         assert(error);
 519
 520         l = get_ntp_services();
 521         STRV_FOREACH(i, l) {
 522                 char* k[2];
 523
 524                 if (m)
 525                         dbus_message_unref(m);
 526                 m = dbus_message_new_method_call(
 527                                 "org.freedesktop.systemd1",
 528                                 "/org/freedesktop/systemd1",
 529                                 "org.freedesktop.systemd1.Manager",
 530                                 tz.use_ntp ? "EnableUnitFiles" : "DisableUnitFiles");
 531                 if (!m) {
 532                         log_error("Could not allocate message.");
 533                         r = -ENOMEM;
 534                         goto finish;
 535                 }
 536
 537                 dbus_message_iter_init_append(m, &iter);
 538
 539                 k[0] = *i;
 540                 k[1] = NULL;
 541
 542                 r = bus_append_strv_iter(&iter, k);
 543                 if (r < 0) {
 544                         log_error("Failed to append unit files.");
 545                         goto finish;
 546                 }
 547
 548                 /* send runtime bool */
 549                 if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &f)) {
 550                         log_error("Failed to append runtime boolean.");
 551                         r = -ENOMEM;
 552                         goto finish;
 553                 }
 554
 555                 if (tz.use_ntp) {
 556                         /* send force bool */
 557                         if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_BOOLEAN, &t)) {
 558                                 log_error("Failed to append force boolean.");
 559                                 r = -ENOMEM;
 560                                 goto finish;
 561                         }
 562                 }
 563
 564                 if (reply)
 565                         dbus_message_unref(reply);
 566                 reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);
 567                 if (!reply) {
 568                         if (streq(error->name, "org.freedesktop.DBus.Error.FileNotFound")) {
 569                                 /* This implementation does not exist, try next one */
 570                                 dbus_error_free(error);
 571                                 continue;
 572                         }
 573
 574                         log_error("Failed to issue method call: %s", bus_error_message(error));
 575                         r = -EIO;
 576                         goto finish;
 577                 }
 578
 579                 dbus_message_unref(m);
 580                 m = dbus_message_new_method_call(
 581                                 "org.freedesktop.systemd1",
 582                                 "/org/freedesktop/systemd1",
 583                                 "org.freedesktop.systemd1.Manager",
 584                                 "Reload");
 585                 if (!m) {
 586                         log_error("Could not allocate message.");
 587                         r = -ENOMEM;
 588                         goto finish;
 589                 }
 590
 591                 dbus_message_unref(reply);
 592                 reply = dbus_connection_send_with_reply_and_block(bus, m, -1, error);
 593                 if (!reply) {
 594                         log_error("Failed to issue method call: %s", bus_error_message(error));
 595                         r = -EIO;
 596                         goto finish;
 597                 }
 598
 599                 r = 0;
 600                 goto finish;
 601         }
 602
 603         r = -ENOENT;
 604
 605 finish:
 606         if (m)
 607                 dbus_message_unref(m);
 608
 609         if (reply)
 610                 dbus_message_unref(reply);
 611
 612         strv_free(l);
 613
 614         return r;
 615 }
 616
 617 static int property_append_ntp(DBusMessageIter *i, const char *property, void *data) {
 618         dbus_bool_t db;
 619
 620         assert(i);
 621         assert(property);
 622
 623         db = tz.use_ntp > 0;
 624
 625         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
 626                 return -ENOMEM;
 627
 628         return 0;
 629 }
 630
 631 static const BusProperty bus_timedate_properties[] = {
 632         { "Timezone", bus_property_append_string, "s", offsetof(TZ, zone),     true },
 633         { "LocalRTC", bus_property_append_bool,   "b", offsetof(TZ, local_rtc) },
 634         { "NTP",      property_append_ntp,        "b", offsetof(TZ, use_ntp)   },
 635         { NULL, }
 636 };
 637
 638 static const BusBoundProperties bps[] = {
 639         { "org.freedesktop.timedate1", bus_timedate_properties, &tz },
 640         { NULL, }
 641 };
 642
 643 static DBusHandlerResult timedate_message_handler(
 644                 DBusConnection *connection,
 645                 DBusMessage *message,
 646                 void *userdata) {
 647
 648         DBusMessage *reply = NULL, *changed = NULL;
 649         DBusError error;
 650         int r;
 651
 652         assert(connection);
 653         assert(message);
 654
 655         dbus_error_init(&error);
 656
 657         if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTimezone")) {
 658                 const char *z;
 659                 dbus_bool_t interactive;
 660
 661                 if (!dbus_message_get_args(
 662                                     message,
 663                                     &error,
 664                                     DBUS_TYPE_STRING, &z,
 665                                     DBUS_TYPE_BOOLEAN, &interactive,
 666                                     DBUS_TYPE_INVALID))
 667                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 668
 669                 if (!valid_timezone(z))
 670                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
 671
 672                 if (!streq_ptr(z, tz.zone)) {
 673                         char *t;
 674
 675                         r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-timezone", interactive, NULL, &error);
 676                         if (r < 0)
 677                                 return bus_send_error_reply(connection, message, &error, r);
 678
 679                         t = strdup(z);
 680                         if (!t)
 681                                 goto oom;
 682
 683                         free(tz.zone);
 684                         tz.zone = t;
 685
 686                         /* 1. Write new configuration file */
 687                         r = write_data_timezone();
 688                         if (r < 0) {
 689                                 log_error("Failed to set timezone: %s", strerror(-r));
 690                                 return bus_send_error_reply(connection, message, NULL, r);
 691                         }
 692
 693                         if (tz.local_rtc) {
 694                                 struct timespec ts;
 695                                 struct tm *tm;
 696
 697                                 /* 2. Teach kernel new timezone */
 698                                 hwclock_apply_localtime_delta(NULL);
 699
 700                                 /* 3. Sync RTC from system clock, with the new delta */
 701                                 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
 702                                 assert_se(tm = localtime(&ts.tv_sec));
 703                                 hwclock_set_time(tm);
 704                         }
 705
 706                         log_struct(LOG_INFO,
 707                                    "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(SD_MESSAGE_TIMEZONE_CHANGE),
 708                                    "TIMEZONE=%s", tz.zone,
 709                                    "MESSAGE=Changed timezone to '%s'.", tz.zone,
 710                                    NULL);
 711
 712                         changed = bus_properties_changed_new(
 713                                         "/org/freedesktop/timedate1",
 714                                         "org.freedesktop.timedate1",
 715                                         "Timezone\0");
 716                         if (!changed)
 717                                 goto oom;
 718                 }
 719
 720         } else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetLocalRTC")) {
 721                 dbus_bool_t lrtc;
 722                 dbus_bool_t fix_system;
 723                 dbus_bool_t interactive;
 724
 725                 if (!dbus_message_get_args(
 726                                     message,
 727                                     &error,
 728                                     DBUS_TYPE_BOOLEAN, &lrtc,
 729                                     DBUS_TYPE_BOOLEAN, &fix_system,
 730                                     DBUS_TYPE_BOOLEAN, &interactive,
 731                                     DBUS_TYPE_INVALID))
 732                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 733
 734                 if (lrtc != tz.local_rtc) {
 735                         struct timespec ts;
 736
 737                         r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-local-rtc", interactive, NULL, &error);
 738                         if (r < 0)
 739                                 return bus_send_error_reply(connection, message, &error, r);
 740
 741                         tz.local_rtc = lrtc;
 742
 743                         /* 1. Write new configuration file */
 744                         r = write_data_local_rtc();
 745                         if (r < 0) {
 746                                 log_error("Failed to set RTC to local/UTC: %s", strerror(-r));
 747                                 return bus_send_error_reply(connection, message, NULL, r);
 748                         }
 749
 750                         /* 2. Teach kernel new timezone */
 751                         if (tz.local_rtc)
 752                                 hwclock_apply_localtime_delta(NULL);
 753                         else
 754                                 hwclock_reset_localtime_delta();
 755
 756                         /* 3. Synchronize clocks */
 757                         assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
 758
 759                         if (fix_system) {
 760                                 struct tm tm;
 761
 762                                 /* Sync system clock from RTC; first,
 763                                  * initialize the timezone fields of
 764                                  * struct tm. */
 765                                 if (tz.local_rtc)
 766                                         tm = *localtime(&ts.tv_sec);
 767                                 else
 768                                         tm = *gmtime(&ts.tv_sec);
 769
 770                                 /* Override the main fields of
 771                                  * struct tm, but not the timezone
 772                                  * fields */
 773                                 if (hwclock_get_time(&tm) >= 0) {
 774
 775                                         /* And set the system clock
 776                                          * with this */
 777                                         if (tz.local_rtc)
 778                                                 ts.tv_sec = mktime(&tm);
 779                                         else
 780                                                 ts.tv_sec = timegm(&tm);
 781
 782                                         clock_settime(CLOCK_REALTIME, &ts);
 783                                 }
 784
 785                         } else {
 786                                 struct tm *tm;
 787
 788                                 /* Sync RTC from system clock */
 789                                 if (tz.local_rtc)
 790                                         tm = localtime(&ts.tv_sec);
 791                                 else
 792                                         tm = gmtime(&ts.tv_sec);
 793
 794                                 hwclock_set_time(tm);
 795                         }
 796
 797                         log_info("RTC configured to %s time.", tz.local_rtc ? "local" : "UTC");
 798
 799                         changed = bus_properties_changed_new(
 800                                         "/org/freedesktop/timedate1",
 801                                         "org.freedesktop.timedate1",
 802                                         "LocalRTC\0");
 803                         if (!changed)
 804                                 goto oom;
 805                 }
 806
 807         } else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTime")) {
 808                 int64_t utc;
 809                 dbus_bool_t relative;
 810                 dbus_bool_t interactive;
 811
 812                 if (!dbus_message_get_args(
 813                                     message,
 814                                     &error,
 815                                     DBUS_TYPE_INT64, &utc,
 816                                     DBUS_TYPE_BOOLEAN, &relative,
 817                                     DBUS_TYPE_BOOLEAN, &interactive,
 818                                     DBUS_TYPE_INVALID))
 819                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 820
 821                 if (!relative && utc <= 0)
 822                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
 823
 824                 if (!relative || utc != 0) {
 825                         struct timespec ts;
 826                         struct tm* tm;
 827
 828                         r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-time", interactive, NULL, &error);
 829                         if (r < 0)
 830                                 return bus_send_error_reply(connection, message, &error, r);
 831
 832                         if (relative)
 833                                 timespec_store(&ts, now(CLOCK_REALTIME) + utc);
 834                         else
 835                                 timespec_store(&ts, utc);
 836
 837                         /* Set system clock */
 838                         if (clock_settime(CLOCK_REALTIME, &ts) < 0) {
 839                                 log_error("Failed to set local time: %m");
 840                                 return bus_send_error_reply(connection, message, NULL, -errno);
 841                         }
 842
 843                         /* Sync down to RTC */
 844                         if (tz.local_rtc)
 845                                 tm = localtime(&ts.tv_sec);
 846                         else
 847                                 tm = gmtime(&ts.tv_sec);
 848
 849                         hwclock_set_time(tm);
 850
 851                         log_struct(LOG_INFO,
 852                                    "MESSAGE_ID=" SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL(SD_MESSAGE_TIME_CHANGE),
 853                                    "REALTIME=%llu", (unsigned long long) timespec_load(&ts),
 854                                    "MESSAGE=Changed local time to %s", ctime(&ts.tv_sec),
 855                                    NULL);
 856                 }
 857         } else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetNTP")) {
 858                 dbus_bool_t ntp;
 859                 dbus_bool_t interactive;
 860
 861                 if (!dbus_message_get_args(
 862                                     message,
 863                                     &error,
 864                                     DBUS_TYPE_BOOLEAN, &ntp,
 865                                     DBUS_TYPE_BOOLEAN, &interactive,
 866                                     DBUS_TYPE_INVALID))
 867                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 868
 869                 if (ntp != !!tz.use_ntp) {
 870
 871                         r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-ntp", interactive, NULL, &error);
 872                         if (r < 0)
 873                                 return bus_send_error_reply(connection, message, &error, r);
 874
 875                         tz.use_ntp = !!ntp;
 876
 877                         r = enable_ntp(connection, &error);
 878                         if (r < 0)
 879                                 return bus_send_error_reply(connection, message, &error, r);
 880
 881                         r = start_ntp(connection, &error);
 882                         if (r < 0)
 883                                 return bus_send_error_reply(connection, message, &error, r);
 884
 885                         log_info("Set NTP to %s", tz.use_ntp ? "enabled" : "disabled");
 886
 887                         changed = bus_properties_changed_new(
 888                                         "/org/freedesktop/timedate1",
 889                                         "org.freedesktop.timedate1",
 890                                         "NTP\0");
 891                         if (!changed)
 892                                 goto oom;
 893                 }
 894
 895         } else
 896                 return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, bps);
 897
 898         if (!(reply = dbus_message_new_method_return(message)))
 899                 goto oom;
 900
 901         if (!dbus_connection_send(connection, reply, NULL))
 902                 goto oom;
 903
 904         dbus_message_unref(reply);
 905         reply = NULL;
 906
 907         if (changed) {
 908
 909                 if (!dbus_connection_send(connection, changed, NULL))
 910                         goto oom;
 911
 912                 dbus_message_unref(changed);
 913         }
 914
 915         return DBUS_HANDLER_RESULT_HANDLED;
 916
 917 oom:
 918         if (reply)
 919                 dbus_message_unref(reply);
 920
 921         if (changed)
 922                 dbus_message_unref(changed);
 923
 924         dbus_error_free(&error);
 925
 926         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 927 }
 928
 929 static int connect_bus(DBusConnection **_bus) {
 930         static const DBusObjectPathVTable timedate_vtable = {
 931                 .message_function = timedate_message_handler
 932         };
 933         DBusError error;
 934         DBusConnection *bus = NULL;
 935         int r;
 936
 937         assert(_bus);
 938
 939         dbus_error_init(&error);
 940
 941         bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
 942         if (!bus) {
 943                 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
 944                 r = -ECONNREFUSED;
 945                 goto fail;
 946         }
 947
 948         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 949
 950         if (!dbus_connection_register_object_path(bus, "/org/freedesktop/timedate1", &timedate_vtable, NULL) ||
 951             !dbus_connection_add_filter(bus, bus_exit_idle_filter, &remain_until, NULL)) {
 952                 r = log_oom();
 953                 goto fail;
 954         }
 955
 956         r = dbus_bus_request_name(bus, "org.freedesktop.timedate1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
 957         if (dbus_error_is_set(&error)) {
 958                 log_error("Failed to register name on bus: %s", bus_error_message(&error));
 959                 r = -EEXIST;
 960                 goto fail;
 961         }
 962
 963         if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER)  {
 964                 log_error("Failed to acquire name.");
 965                 r = -EEXIST;
 966                 goto fail;
 967         }
 968
 969         if (_bus)
 970                 *_bus = bus;
 971
 972         return 0;
 973
 974 fail:
 975         dbus_connection_close(bus);
 976         dbus_connection_unref(bus);
 977
 978         dbus_error_free(&error);
 979
 980         return r;
 981 }
 982
 983 int main(int argc, char *argv[]) {
 984         int r;
 985         DBusConnection *bus = NULL;
 986         bool exiting = false;
 987
 988         log_set_target(LOG_TARGET_AUTO);
 989         log_parse_environment();
 990         log_open();
 991
 992         umask(0022);
 993
 994         if (argc == 2 && streq(argv[1], "--introspect")) {
 995                 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 996                       "<node>\n", stdout);
 997                 fputs(timedate_interface, stdout);
 998                 fputs("</node>\n", stdout);
 999                 return 0;
1000         }
1001
1002         if (argc != 1) {
1003                 log_error("This program takes no arguments.");
1004                 r = -EINVAL;
1005                 goto finish;
1006         }
1007
1008         r = read_data();
1009         if (r < 0) {
1010                 log_error("Failed to read timezone data: %s", strerror(-r));
1011                 goto finish;
1012         }
1013
1014         r = connect_bus(&bus);
1015         if (r < 0)
1016                 goto finish;
1017
1018         r = read_ntp(bus);
1019         if (r < 0) {
1020                 log_error("Failed to determine whether NTP is enabled: %s", strerror(-r));
1021                 goto finish;
1022         }
1023
1024         remain_until = now(CLOCK_MONOTONIC) + DEFAULT_EXIT_USEC;
1025         for (;;) {
1026
1027                 if (!dbus_connection_read_write_dispatch(bus, exiting ? -1 : (int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC)))
1028                         break;
1029
1030                 if (!exiting && remain_until < now(CLOCK_MONOTONIC)) {
1031                         exiting = true;
1032                         bus_async_unregister_and_exit(bus, "org.freedesktop.hostname1");
1033                 }
1034         }
1035
1036         r = 0;
1037
1038 finish:
1039         free_data();
1040
1041         if (bus) {
1042                 dbus_connection_flush(bus);
1043                 dbus_connection_close(bus);
1044                 dbus_connection_unref(bus);
1045         }
1046
1047         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
1048 }