src/localed.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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU 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 "util.h"
  29 #include "strv.h"
  30 #include "dbus-common.h"
  31 #include "polkit.h"
  32
  33 #define INTERFACE                                                       \
  34         " <interface name=\"org.freedesktop.locale1\">\n"               \
  35         "  <property name=\"Locale\" type=\"as\" access=\"read\"/>\n"   \
  36         "  <method name=\"SetLocale\">\n"                               \
  37         "   <arg name=\"locale\" type=\"as\" direction=\"in\"/>\n"      \
  38         "   <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
  39         "  </method>\n"                                                 \
  40         " </interface>\n"
  41
  42 #define INTROSPECTION                                                   \
  43         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  44         "<node>\n"                                                      \
  45         INTERFACE                                                       \
  46         BUS_PROPERTIES_INTERFACE                                        \
  47         BUS_INTROSPECTABLE_INTERFACE                                    \
  48         BUS_PEER_INTERFACE                                              \
  49         "</node>\n"
  50
  51 #define INTERFACES_LIST                         \
  52         BUS_GENERIC_INTERFACES_LIST             \
  53         "org.freedesktop.locale1\0"
  54
  55 const char locale_interface[] _introspect_("locale1") = INTERFACE;
  56
  57 enum {
  58         /* We don't list LC_ALL here on purpose. People should be
  59          * using LANG instead. */
  60
  61         PROP_LANG,
  62         PROP_LC_CTYPE,
  63         PROP_LC_NUMERIC,
  64         PROP_LC_TIME,
  65         PROP_LC_COLLATE,
  66         PROP_LC_MONETARY,
  67         PROP_LC_MESSAGES,
  68         PROP_LC_PAPER,
  69         PROP_LC_NAME,
  70         PROP_LC_ADDRESS,
  71         PROP_LC_TELEPHONE,
  72         PROP_LC_MEASUREMENT,
  73         PROP_LC_IDENTIFICATION,
  74         _PROP_MAX
  75 };
  76
  77 static const char * const names[_PROP_MAX] = {
  78         [PROP_LANG] = "LANG",
  79         [PROP_LC_CTYPE] = "LC_CTYPE",
  80         [PROP_LC_NUMERIC] = "LC_NUMERIC",
  81         [PROP_LC_TIME] = "LC_TIME",
  82         [PROP_LC_COLLATE] = "LC_COLLATE",
  83         [PROP_LC_MONETARY] = "LC_MONETARY",
  84         [PROP_LC_MESSAGES] = "LC_MESSAGES",
  85         [PROP_LC_PAPER] = "LC_PAPER",
  86         [PROP_LC_NAME] = "LC_NAME",
  87         [PROP_LC_ADDRESS] = "LC_ADDRESS",
  88         [PROP_LC_TELEPHONE] = "LC_TELEPHONE",
  89         [PROP_LC_MEASUREMENT] = "LC_MEASUREMENT",
  90         [PROP_LC_IDENTIFICATION] = "LC_IDENTIFICATION"
  91 };
  92
  93 static char *data[_PROP_MAX] = {
  94         NULL,
  95         NULL,
  96         NULL,
  97         NULL,
  98         NULL,
  99         NULL,
 100         NULL,
 101         NULL,
 102         NULL,
 103         NULL,
 104         NULL,
 105         NULL,
 106         NULL
 107 };
 108
 109 static void free_data(void) {
 110         int p;
 111
 112         for (p = 0; p < _PROP_MAX; p++) {
 113                 free(data[p]);
 114                 data[p] = NULL;
 115         }
 116 }
 117
 118 static void simplify(void) {
 119         int p;
 120
 121         for (p = 1; p < _PROP_MAX; p++)
 122                 if (isempty(data[p]) || streq_ptr(data[PROP_LANG], data[p])) {
 123                         free(data[p]);
 124                         data[p] = NULL;
 125                 }
 126 }
 127
 128 static int read_data(void) {
 129         int r;
 130
 131         free_data();
 132
 133         r = parse_env_file("/etc/locale.conf", NEWLINE,
 134                            "LANG",              &data[PROP_LANG],
 135                            "LC_CTYPE",          &data[PROP_LC_CTYPE],
 136                            "LC_NUMERIC",        &data[PROP_LC_NUMERIC],
 137                            "LC_TIME",           &data[PROP_LC_TIME],
 138                            "LC_COLLATE",        &data[PROP_LC_COLLATE],
 139                            "LC_MONETARY",       &data[PROP_LC_MONETARY],
 140                            "LC_MESSAGES",       &data[PROP_LC_MESSAGES],
 141                            "LC_PAPER",          &data[PROP_LC_PAPER],
 142                            "LC_NAME",           &data[PROP_LC_NAME],
 143                            "LC_ADDRESS",        &data[PROP_LC_ADDRESS],
 144                            "LC_TELEPHONE",      &data[PROP_LC_TELEPHONE],
 145                            "LC_MEASUREMENT",    &data[PROP_LC_MEASUREMENT],
 146                            "LC_IDENTIFICATION", &data[PROP_LC_IDENTIFICATION],
 147                            NULL);
 148
 149         if (r == -ENOENT) {
 150                 int p;
 151
 152                 /* Fill in what we got passed from systemd. */
 153
 154                 for (p = 0; p < _PROP_MAX; p++) {
 155                         char *e, *d;
 156
 157                         assert(names[p]);
 158
 159                         e = getenv(names[p]);
 160                         if (e) {
 161                                 d = strdup(e);
 162                                 if (!d)
 163                                         return -ENOMEM;
 164                         } else
 165                                 d = NULL;
 166
 167                         free(data[p]);
 168                         data[p] = d;
 169                 }
 170
 171                 r = 0;
 172         }
 173
 174         simplify();
 175         return r;
 176 }
 177
 178 static int write_data(void) {
 179         int r, p;
 180         char **l = NULL;
 181
 182         r = load_env_file("/etc/locale.conf", &l);
 183         if (r < 0 && r != -ENOENT)
 184                 return r;
 185
 186         for (p = 0; p < _PROP_MAX; p++) {
 187                 char *t, **u;
 188
 189                 assert(names[p]);
 190
 191                 if (isempty(data[p])) {
 192                         l = strv_env_unset(l, names[p]);
 193                         continue;
 194                 }
 195
 196                 if (asprintf(&t, "%s=%s", names[p], data[p]) < 0) {
 197                         strv_free(l);
 198                         return -ENOMEM;
 199                 }
 200
 201                 u = strv_env_set(l, t);
 202                 free(t);
 203                 strv_free(l);
 204
 205                 if (!u)
 206                         return -ENOMEM;
 207
 208                 l = u;
 209         }
 210
 211         if (strv_isempty(l)) {
 212
 213                 if (unlink("/etc/locale.conf") < 0)
 214                         return errno == ENOENT ? 0 : -errno;
 215
 216                 return 0;
 217         }
 218
 219         r = write_env_file("/etc/locale.conf", l);
 220         strv_free(l);
 221
 222         return r;
 223 }
 224
 225 static void push_data(DBusConnection *bus) {
 226         char **l_set = NULL, **l_unset = NULL, **t;
 227         int c_set = 0, c_unset = 0, p;
 228         DBusError error;
 229         DBusMessage *m = NULL, *reply = NULL;
 230         DBusMessageIter iter, sub;
 231
 232         dbus_error_init(&error);
 233
 234         assert(bus);
 235
 236         l_set = new0(char*, _PROP_MAX);
 237         l_unset = new0(char*, _PROP_MAX);
 238         if (!l_set || !l_unset) {
 239                 log_error("Out of memory");
 240                 goto finish;
 241         }
 242
 243         for (p = 0; p < _PROP_MAX; p++) {
 244                 assert(names[p]);
 245
 246                 if (isempty(data[p]))
 247                         l_unset[c_set++] = (char*) names[p];
 248                 else {
 249                         char *s;
 250
 251                         if (asprintf(&s, "%s=%s", names[p], data[p]) < 0) {
 252                                 log_error("Out of memory");
 253                                 goto finish;
 254                         }
 255
 256                         l_set[c_unset++] = s;
 257                 }
 258         }
 259
 260         assert(c_set + c_unset == _PROP_MAX);
 261         m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnsetAndSetEnvironment");
 262         if (!m) {
 263                 log_error("Could not allocate message.");
 264                 goto finish;
 265         }
 266
 267         dbus_message_iter_init_append(m, &iter);
 268
 269         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub)) {
 270                 log_error("Out of memory.");
 271                 goto finish;
 272         }
 273
 274         STRV_FOREACH(t, l_unset)
 275                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t)) {
 276                         log_error("Out of memory.");
 277                         goto finish;
 278                 }
 279
 280         if (!dbus_message_iter_close_container(&iter, &sub) ||
 281             !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub)) {
 282                 log_error("Out of memory.");
 283                 goto finish;
 284         }
 285
 286         STRV_FOREACH(t, l_set)
 287                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t)) {
 288                         log_error("Out of memory.");
 289                         goto finish;
 290                 }
 291
 292         if (!dbus_message_iter_close_container(&iter, &sub)) {
 293                 log_error("Out of memory.");
 294                 goto finish;
 295         }
 296
 297         reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
 298         if (!reply) {
 299                 log_error("Failed to set locale information: %s", bus_error_message(&error));
 300                 goto finish;
 301         }
 302
 303 finish:
 304         if (m)
 305                 dbus_message_unref(m);
 306
 307         if (reply)
 308                 dbus_message_unref(reply);
 309
 310         dbus_error_free(&error);
 311
 312         strv_free(l_set);
 313         free(l_unset);
 314 }
 315
 316 static int append_locale(DBusMessageIter *i, const char *property, void *userdata) {
 317         int r, c = 0, p;
 318         char **l;
 319
 320         l = new0(char*, _PROP_MAX+1);
 321         if (!l)
 322                 return -ENOMEM;
 323
 324         for (p = 0; p < _PROP_MAX; p++) {
 325                 char *t;
 326
 327                 if (isempty(data[p]))
 328                         continue;
 329
 330                 if (asprintf(&t, "%s=%s", names[p], data[p]) < 0) {
 331                         strv_free(l);
 332                         return -ENOMEM;
 333                 }
 334
 335                 l[c++] = t;
 336         }
 337
 338         r = bus_property_append_strv(i, property, (void*) l);
 339         strv_free(l);
 340
 341         return r;
 342 }
 343
 344 static DBusHandlerResult locale_message_handler(
 345                 DBusConnection *connection,
 346                 DBusMessage *message,
 347                 void *userdata) {
 348
 349         const BusProperty properties[] = {
 350                 { "org.freedesktop.locale1", "Locale", append_locale, "as", NULL},
 351                 { NULL, NULL, NULL, NULL, NULL }
 352         };
 353
 354         DBusMessage *reply = NULL, *changed = NULL;
 355         DBusError error;
 356         int r;
 357
 358         assert(connection);
 359         assert(message);
 360
 361         dbus_error_init(&error);
 362
 363         if (dbus_message_is_method_call(message, "org.freedesktop.locale1", "SetLocale")) {
 364                 char **l = NULL, **i;
 365                 dbus_bool_t interactive;
 366                 DBusMessageIter iter;
 367                 bool modified = false;
 368                 bool passed[_PROP_MAX];
 369                 int p;
 370
 371                 if (!dbus_message_iter_init(message, &iter))
 372                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
 373
 374                 r = bus_parse_strv_iter(&iter, &l);
 375                 if (r < 0) {
 376                         if (r == -ENOMEM)
 377                                 goto oom;
 378
 379                         return bus_send_error_reply(connection, message, NULL, r);
 380                 }
 381
 382                 if (!dbus_message_iter_next(&iter) ||
 383                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN)  {
 384                         strv_free(l);
 385                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
 386                 }
 387
 388                 dbus_message_iter_get_basic(&iter, &interactive);
 389
 390                 zero(passed);
 391
 392                 /* Check whether a variable changed and if so valid */
 393                 STRV_FOREACH(i, l) {
 394                         bool valid = false;
 395
 396                         for (p = 0; p < _PROP_MAX; p++) {
 397                                 size_t k;
 398
 399                                 k = strlen(names[p]);
 400                                 if (startswith(*i, names[p]) && (*i)[k] == '=') {
 401                                         valid = true;
 402                                         passed[p] = true;
 403
 404                                         if (!streq_ptr(*i + k + 1, data[p]))
 405                                                 modified = true;
 406
 407                                         break;
 408                                 }
 409                         }
 410
 411                         if (!valid) {
 412                                 strv_free(l);
 413                                 return bus_send_error_reply(connection, message, NULL, -EINVAL);
 414                         }
 415                 }
 416
 417                 /* Check whether a variable is unset */
 418                 if (!modified)  {
 419                         for (p = 0; p < _PROP_MAX; p++)
 420                                 if (!isempty(data[p]) && !passed[p]) {
 421                                         modified = true;
 422                                         break;
 423                                 }
 424                 }
 425
 426                 if (modified) {
 427
 428                         r = verify_polkit(connection, message, "org.freedesktop.locale1.set-locale", interactive, &error);
 429                         if (r < 0) {
 430                                 strv_free(l);
 431                                 return bus_send_error_reply(connection, message, &error, r);
 432                         }
 433
 434                         STRV_FOREACH(i, l) {
 435                                 for (p = 0; p < _PROP_MAX; p++) {
 436                                         size_t k;
 437
 438                                         k = strlen(names[p]);
 439                                         if (startswith(*i, names[p]) && (*i)[k] == '=') {
 440                                                 char *t;
 441
 442                                                 t = strdup(*i + k + 1);
 443                                                 if (!t) {
 444                                                         strv_free(l);
 445                                                         goto oom;
 446                                                 }
 447
 448                                                 free(data[p]);
 449                                                 data[p] = t;
 450
 451                                                 break;
 452                                         }
 453                                 }
 454                         }
 455
 456                         for (p = 0; p < _PROP_MAX; p++) {
 457                                 if (passed[p])
 458                                         continue;
 459
 460                                 free(data[p]);
 461                                 data[p] = NULL;
 462                         }
 463
 464                         simplify();
 465
 466                         r = write_data();
 467                         if (r < 0) {
 468                                 log_error("Failed to set locale: %s", strerror(-r));
 469                                 return bus_send_error_reply(connection, message, NULL, r);
 470                         }
 471
 472                         push_data(connection);
 473
 474                         log_info("Changed locale information.");
 475
 476                         changed = bus_properties_changed_new(
 477                                         "/org/freedesktop/locale1",
 478                                         "org.freedesktop.locale1",
 479                                         "Locale\0");
 480                         if (!changed)
 481                                 goto oom;
 482                 }
 483
 484         } else
 485                 return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
 486
 487         if (!(reply = dbus_message_new_method_return(message)))
 488                 goto oom;
 489
 490         if (!dbus_connection_send(connection, reply, NULL))
 491                 goto oom;
 492
 493         dbus_message_unref(reply);
 494         reply = NULL;
 495
 496         if (changed) {
 497
 498                 if (!dbus_connection_send(connection, changed, NULL))
 499                         goto oom;
 500
 501                 dbus_message_unref(changed);
 502         }
 503
 504         return DBUS_HANDLER_RESULT_HANDLED;
 505
 506 oom:
 507         if (reply)
 508                 dbus_message_unref(reply);
 509
 510         if (changed)
 511                 dbus_message_unref(changed);
 512
 513         dbus_error_free(&error);
 514
 515         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 516 }
 517
 518 static int connect_bus(DBusConnection **_bus) {
 519         static const DBusObjectPathVTable locale_vtable = {
 520                 .message_function = locale_message_handler
 521         };
 522         DBusError error;
 523         DBusConnection *bus = NULL;
 524         int r;
 525
 526         assert(_bus);
 527
 528         dbus_error_init(&error);
 529
 530         bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);
 531         if (!bus) {
 532                 log_error("Failed to get system D-Bus connection: %s", bus_error_message(&error));
 533                 r = -ECONNREFUSED;
 534                 goto fail;
 535         }
 536
 537         if (!dbus_connection_register_object_path(bus, "/org/freedesktop/locale1", &locale_vtable, NULL)) {
 538                 log_error("Not enough memory");
 539                 r = -ENOMEM;
 540                 goto fail;
 541         }
 542
 543         r = dbus_bus_request_name(bus, "org.freedesktop.locale1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
 544         if (dbus_error_is_set(&error)) {
 545                 log_error("Failed to register name on bus: %s", bus_error_message(&error));
 546                 r = -EEXIST;
 547                 goto fail;
 548         }
 549
 550         if (r != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
 551                 log_error("Failed to acquire name.");
 552                 r = -EEXIST;
 553                 goto fail;
 554         }
 555
 556         if (_bus)
 557                 *_bus = bus;
 558
 559         return 0;
 560
 561 fail:
 562         dbus_connection_close(bus);
 563         dbus_connection_unref(bus);
 564
 565         dbus_error_free(&error);
 566
 567         return r;
 568 }
 569
 570 int main(int argc, char *argv[]) {
 571         int r;
 572         DBusConnection *bus = NULL;
 573
 574         log_set_target(LOG_TARGET_AUTO);
 575         log_parse_environment();
 576         log_open();
 577
 578         umask(0022);
 579
 580         if (argc == 2 && streq(argv[1], "--introspect")) {
 581                 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 582                       "<node>\n", stdout);
 583                 fputs(locale_interface, stdout);
 584                 fputs("</node>\n", stdout);
 585                 return 0;
 586         }
 587
 588         if (argc != 1) {
 589                 log_error("This program takes no arguments.");
 590                 r = -EINVAL;
 591                 goto finish;
 592         }
 593
 594         r = read_data();
 595         if (r < 0) {
 596                 log_error("Failed to read locale data: %s", strerror(-r));
 597                 goto finish;
 598         }
 599
 600         r = connect_bus(&bus);
 601         if (r < 0)
 602                 goto finish;
 603
 604         while (dbus_connection_read_write_dispatch(bus, -1))
 605                 ;
 606
 607         r = 0;
 608
 609 finish:
 610         free_data();
 611
 612         if (bus) {
 613                 dbus_connection_flush(bus);
 614                 dbus_connection_close(bus);
 615                 dbus_connection_unref(bus);
 616         }
 617
 618         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 619 }