src/libsystemd-bus/bus-util.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 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 <sys/socket.h>
  23 #include <sys/capability.h>
  24
  25 #include "util.h"
  26 #include "strv.h"
  27 #include "macro.h"
  28 #include "def.h"
  29 #include "missing.h"
  30
  31 #include "sd-event.h"
  32 #include "sd-bus.h"
  33 #include "bus-error.h"
  34 #include "bus-message.h"
  35 #include "bus-util.h"
  36 #include "bus-internal.h"
  37
  38 static int quit_callback(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
  39         sd_event *e = userdata;
  40
  41         assert(bus);
  42         assert(m);
  43         assert(e);
  44
  45         sd_event_request_quit(e);
  46         return 1;
  47 }
  48
  49 int bus_async_unregister_and_quit(sd_event *e, sd_bus *bus, const char *name) {
  50         _cleanup_free_ char *match = NULL;
  51         int r;
  52
  53         assert(e);
  54         assert(bus);
  55         assert(name);
  56
  57         r = asprintf(&match, "type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameLost',arg0='%s'", name);
  58         if (r < 0)
  59                 return r;
  60
  61         r = sd_bus_add_match(bus, match, quit_callback, e);
  62         if (r < 0)
  63                 return r;
  64
  65         r = sd_bus_release_name(bus, name);
  66         if (r < 0)
  67                 return r;
  68
  69         if (r != SD_BUS_NAME_RELEASED)
  70                 return -EIO;
  71
  72         return 0;
  73 }
  74
  75 int bus_event_loop_with_idle(sd_event *e, sd_bus *bus, const char *name, usec_t timeout) {
  76         bool exiting = false;
  77         int r;
  78
  79         assert(e);
  80         assert(bus);
  81         assert(name);
  82
  83         for (;;) {
  84                 r = sd_event_get_state(e);
  85                 if (r < 0)
  86                         return r;
  87
  88                 if (r == SD_EVENT_FINISHED)
  89                         break;
  90
  91                 r = sd_event_run(e, exiting ? (uint64_t) -1 : timeout);
  92                 if (r < 0)
  93                         return r;
  94
  95                 if (r == 0 && !exiting) {
  96                         r = bus_async_unregister_and_quit(e, bus, name);
  97                         if (r < 0)
  98                                 return r;
  99
 100                         exiting = true;
 101                 }
 102         }
 103
 104         return 0;
 105 }
 106
 107 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
 108         _cleanup_bus_message_unref_ sd_bus_message *rep = NULL;
 109         int r, has_owner = 0;
 110
 111         assert(c);
 112         assert(name);
 113
 114         r = sd_bus_call_method(c,
 115                                "org.freedesktop.DBus",
 116                                "/org/freedesktop/dbus",
 117                                "org.freedesktop.DBus",
 118                                "NameHasOwner",
 119                                error,
 120                                &rep,
 121                                "s",
 122                                name);
 123         if (r < 0)
 124                 return r;
 125
 126         r = sd_bus_message_read_basic(rep, 'b', &has_owner);
 127         if (r < 0)
 128                 return sd_bus_error_set_errno(error, r);
 129
 130         return has_owner;
 131 }
 132
 133 int bus_verify_polkit(
 134                 sd_bus *bus,
 135                 sd_bus_message *m,
 136                 const char *action,
 137                 bool interactive,
 138                 bool *_challenge,
 139                 sd_bus_error *e) {
 140
 141         _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 142         uid_t uid;
 143         int r;
 144
 145         assert(bus);
 146         assert(m);
 147         assert(action);
 148
 149         r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_UID, &creds);
 150         if (r < 0)
 151                 return r;
 152
 153         r = sd_bus_creds_get_uid(creds, &uid);
 154         if (r < 0)
 155                 return r;
 156
 157         if (uid == 0)
 158                 return 1;
 159
 160 #ifdef ENABLE_POLKIT
 161         else {
 162                 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
 163                 int authorized = false, challenge = false;
 164                 const char *sender;
 165
 166                 sender = sd_bus_message_get_sender(m);
 167                 if (!sender)
 168                         return -EBADMSG;
 169
 170                 r = sd_bus_call_method(
 171                                 bus,
 172                                 "org.freedesktop.PolicyKit1",
 173                                 "/org/freedesktop/PolicyKit1/Authority",
 174                                 "org.freedesktop.PolicyKit1.Authority",
 175                                 "CheckAuthorization",
 176                                 e,
 177                                 &reply,
 178                                 "(sa{sv})sa{ss}us",
 179                                 "system-bus-name", 1, "name", "s", sender,
 180                                 action,
 181                                 0,
 182                                 interactive ? 1 : 0,
 183                                 "");
 184
 185                 if (r < 0) {
 186                         /* Treat no PK available as access denied */
 187                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
 188                                 sd_bus_error_free(e);
 189                                 return -EACCES;
 190                         }
 191
 192                         return r;
 193                 }
 194
 195                 r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
 196                 if (r >= 0)
 197                         r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
 198
 199                 if (authorized)
 200                         return 1;
 201
 202                 if (_challenge) {
 203                         *_challenge = challenge;
 204                         return 0;
 205                 }
 206         }
 207 #endif
 208
 209         return -EACCES;
 210 }
 211
 212 #ifdef ENABLE_POLKIT
 213
 214 typedef struct AsyncPolkitQuery {
 215         sd_bus_message *request, *reply;
 216         sd_bus_message_handler_t callback;
 217         void *userdata;
 218         uint64_t serial;
 219         Hashmap *registry;
 220 } AsyncPolkitQuery;
 221
 222 static void async_polkit_query_free(sd_bus *b, AsyncPolkitQuery *q) {
 223
 224         if (!q)
 225                 return;
 226
 227         if (q->serial > 0 && b)
 228                 sd_bus_call_async_cancel(b, q->serial);
 229
 230         if (q->registry && q->request)
 231                 hashmap_remove(q->registry, q->request);
 232
 233         sd_bus_message_unref(q->request);
 234         sd_bus_message_unref(q->reply);
 235
 236         free(q);
 237 }
 238
 239 static int async_polkit_callback(sd_bus *bus, sd_bus_message *reply, void *userdata, sd_bus_error *error) {
 240         _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
 241         AsyncPolkitQuery *q = userdata;
 242         int r;
 243
 244         assert(bus);
 245         assert(reply);
 246         assert(q);
 247
 248         q->reply = sd_bus_message_ref(reply);
 249         q->serial = 0;
 250
 251         r = sd_bus_message_rewind(q->request, true);
 252         if (r < 0) {
 253                 r = sd_bus_reply_method_errno(q->request, r, NULL);
 254                 goto finish;
 255         }
 256
 257         r = q->callback(bus, q->request, q->userdata, &error_buffer);
 258         r = bus_maybe_reply_error(q->request, r, &error_buffer);
 259
 260 finish:
 261         async_polkit_query_free(bus, q);
 262         return r;
 263 }
 264
 265 #endif
 266
 267 int bus_verify_polkit_async(
 268                 sd_bus *bus,
 269                 Hashmap **registry,
 270                 sd_bus_message *m,
 271                 const char *action,
 272                 bool interactive,
 273                 sd_bus_error *error,
 274                 sd_bus_message_handler_t callback,
 275                 void *userdata) {
 276
 277 #ifdef ENABLE_POLKIT
 278         _cleanup_bus_message_unref_ sd_bus_message *pk = NULL;
 279         AsyncPolkitQuery *q;
 280         const char *sender;
 281 #endif
 282         _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
 283         uid_t uid;
 284         int r;
 285
 286         assert(bus);
 287         assert(registry);
 288         assert(m);
 289         assert(action);
 290
 291 #ifdef ENABLE_POLKIT
 292         q = hashmap_get(*registry, m);
 293         if (q) {
 294                 int authorized, challenge;
 295
 296                 /* This is the second invocation of this function, and
 297                  * there's already a response from polkit, let's
 298                  * process it */
 299                 assert(q->reply);
 300
 301                 if (sd_bus_message_is_method_error(q->reply, NULL)) {
 302                         const sd_bus_error *e;
 303
 304                         /* Copy error from polkit reply */
 305                         e = sd_bus_message_get_error(q->reply);
 306                         sd_bus_error_copy(error, e);
 307
 308                         /* Treat no PK available as access denied */
 309                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
 310                                 return -EACCES;
 311
 312                         return sd_bus_error_get_errno(e);
 313                 }
 314
 315                 r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
 316                 if (r >= 0)
 317                         r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
 318
 319                 if (r < 0)
 320                         return r;
 321
 322                 if (authorized)
 323                         return 1;
 324
 325                 return -EACCES;
 326         }
 327 #endif
 328
 329         r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_UID, &creds);
 330         if (r < 0)
 331                 return r;
 332
 333         r = sd_bus_creds_get_uid(creds, &uid);
 334         if (r < 0)
 335                 return r;
 336
 337         if (uid == 0)
 338                 return 1;
 339
 340 #ifdef ENABLE_POLKIT
 341         sender = sd_bus_message_get_sender(m);
 342         if (!sender)
 343                 return -EBADMSG;
 344
 345         r = hashmap_ensure_allocated(registry, trivial_hash_func, trivial_compare_func);
 346         if (r < 0)
 347                 return r;
 348
 349         r = sd_bus_message_new_method_call(
 350                         bus,
 351                         "org.freedesktop.PolicyKit1",
 352                         "/org/freedesktop/PolicyKit1/Authority",
 353                         "org.freedesktop.PolicyKit1.Authority",
 354                         "CheckAuthorization",
 355                         &pk);
 356         if (r < 0)
 357                 return r;
 358
 359         r = sd_bus_message_append(
 360                         pk,
 361                         "(sa{sv})sa{ss}us",
 362                         "system-bus-name", 1, "name", "s", sender,
 363                         action,
 364                         0,
 365                         interactive ? 1 : 0,
 366                         NULL);
 367         if (r < 0)
 368                 return r;
 369
 370         q = new0(AsyncPolkitQuery, 1);
 371         if (!q)
 372                 return -ENOMEM;
 373
 374         q->request = sd_bus_message_ref(m);
 375         q->callback = callback;
 376         q->userdata = userdata;
 377
 378         r = hashmap_put(*registry, m, q);
 379         if (r < 0) {
 380                 async_polkit_query_free(bus, q);
 381                 return r;
 382         }
 383
 384         q->registry = *registry;
 385
 386         r = sd_bus_call_async(bus, pk, async_polkit_callback, q, 0, &q->serial);
 387         if (r < 0) {
 388                 async_polkit_query_free(bus, q);
 389                 return r;
 390         }
 391
 392         return 0;
 393 #endif
 394
 395         return -EACCES;
 396 }
 397
 398 void bus_verify_polkit_async_registry_free(sd_bus *bus, Hashmap *registry) {
 399 #ifdef ENABLE_POLKIT
 400         AsyncPolkitQuery *q;
 401
 402         while ((q = hashmap_steal_first(registry)))
 403                 async_polkit_query_free(bus, q);
 404
 405         hashmap_free(registry);
 406 #endif
 407 }
 408
 409 int bus_check_peercred(sd_bus *c) {
 410         struct ucred ucred;
 411         socklen_t l;
 412         int fd;
 413
 414         assert(c);
 415
 416         fd = sd_bus_get_fd(c);
 417         if (fd < 0)
 418                 return fd;
 419
 420         l = sizeof(struct ucred);
 421         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 422                 return -errno;
 423
 424         if (l != sizeof(struct ucred))
 425                 return -E2BIG;
 426
 427         if (ucred.uid != 0 && ucred.uid != geteuid())
 428                 return -EPERM;
 429
 430         return 1;
 431 }
 432
 433 int bus_open_system_systemd(sd_bus **_bus) {
 434         _cleanup_bus_unref_ sd_bus *bus = NULL;
 435         int r;
 436
 437         assert(_bus);
 438
 439         if (geteuid() != 0)
 440                 return sd_bus_open_system(_bus);
 441
 442         /* If we are root, then let's talk directly to the system
 443          * instance, instead of going via the bus */
 444
 445         r = sd_bus_new(&bus);
 446         if (r < 0)
 447                 return r;
 448
 449         r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
 450         if (r < 0)
 451                 return r;
 452
 453         r = sd_bus_start(bus);
 454         if (r < 0)
 455                 return r;
 456
 457         r = bus_check_peercred(bus);
 458         if (r < 0)
 459                 return r;
 460
 461         *_bus = bus;
 462         bus = NULL;
 463
 464         return 0;
 465 }
 466
 467 int bus_open_user_systemd(sd_bus **_bus) {
 468         _cleanup_bus_unref_ sd_bus *bus = NULL;
 469         _cleanup_free_ char *p = NULL;
 470         const char *e;
 471         int r;
 472
 473         /* If we are supposed to talk to the instance, try via
 474          * XDG_RUNTIME_DIR first, then fallback to normal bus
 475          * access */
 476
 477         assert(_bus);
 478
 479         e = secure_getenv("XDG_RUNTIME_DIR");
 480         if (e) {
 481                 if (asprintf(&p, "unix:path=%s/systemd/private", e) < 0)
 482                         return -ENOMEM;
 483         }
 484
 485         r = sd_bus_new(&bus);
 486         if (r < 0)
 487                 return r;
 488
 489         r = sd_bus_set_address(bus, p);
 490         if (r < 0)
 491                 return r;
 492
 493         r = sd_bus_start(bus);
 494         if (r < 0)
 495                 return r;
 496
 497         r = bus_check_peercred(bus);
 498         if (r < 0)
 499                 return r;
 500
 501         *_bus = bus;
 502         bus = NULL;
 503
 504         return 0;
 505 }
 506
 507 int bus_print_property(const char *name, sd_bus_message *property, bool all) {
 508         char type;
 509         const char *contents;
 510         int r;
 511
 512         assert(name);
 513         assert(property);
 514
 515         r = sd_bus_message_peek_type(property, &type, &contents);
 516         if (r < 0)
 517                 return r;
 518
 519         switch (type) {
 520
 521         case SD_BUS_TYPE_STRING: {
 522                 const char *s;
 523
 524                 r = sd_bus_message_read_basic(property, type, &s);
 525                 if (r < 0)
 526                         return r;
 527
 528                 if (all || !isempty(s))
 529                         printf("%s=%s\n", name, s);
 530
 531                 return 1;
 532         }
 533
 534         case SD_BUS_TYPE_BOOLEAN: {
 535                 bool b;
 536
 537                 r = sd_bus_message_read_basic(property, type, &b);
 538                 if (r < 0)
 539                         return r;
 540
 541                 printf("%s=%s\n", name, yes_no(b));
 542
 543                 return 1;
 544         }
 545
 546         case SD_BUS_TYPE_UINT64: {
 547                 uint64_t u;
 548
 549                 r = sd_bus_message_read_basic(property, type, &u);
 550                 if (r < 0)
 551                         return r;
 552
 553                 /* Yes, heuristics! But we can change this check
 554                  * should it turn out to not be sufficient */
 555
 556                 if (endswith(name, "Timestamp")) {
 557                         char timestamp[FORMAT_TIMESTAMP_MAX], *t;
 558
 559                         t = format_timestamp(timestamp, sizeof(timestamp), u);
 560                         if (t || all)
 561                                 printf("%s=%s\n", name, strempty(t));
 562
 563                 } else if (strstr(name, "USec")) {
 564                         char timespan[FORMAT_TIMESPAN_MAX];
 565
 566                         printf("%s=%s\n", name, format_timespan(timespan, sizeof(timespan), u, 0));
 567                 } else
 568                         printf("%s=%llu\n", name, (unsigned long long) u);
 569
 570                 return 1;
 571         }
 572
 573         case SD_BUS_TYPE_UINT32: {
 574                 uint32_t u;
 575
 576                 r = sd_bus_message_read_basic(property, type, &u);
 577                 if (r < 0)
 578                         return r;
 579
 580                 if (strstr(name, "UMask") || strstr(name, "Mode"))
 581                         printf("%s=%04o\n", name, u);
 582                 else
 583                         printf("%s=%u\n", name, (unsigned) u);
 584
 585                 return 1;
 586         }
 587
 588         case SD_BUS_TYPE_INT32: {
 589                 int32_t i;
 590
 591                 r = sd_bus_message_read_basic(property, type, &i);
 592                 if (r < 0)
 593                         return r;
 594
 595                 printf("%s=%i\n", name, (int) i);
 596                 return 1;
 597         }
 598
 599         case SD_BUS_TYPE_DOUBLE: {
 600                 double d;
 601
 602                 r = sd_bus_message_read_basic(property, type, &d);
 603                 if (r < 0)
 604                         return r;
 605
 606                 printf("%s=%g\n", name, d);
 607                 return 1;
 608         }
 609
 610         case SD_BUS_TYPE_ARRAY:
 611                 if (streq(contents, "s")) {
 612                         bool first = true;
 613                         const char *str;
 614
 615                         r = sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents);
 616                         if (r < 0)
 617                                 return r;
 618
 619                         while((r = sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) > 0) {
 620                                 if (first)
 621                                         printf("%s=", name);
 622
 623                                 printf("%s%s", first ? "" : " ", str);
 624
 625                                 first = false;
 626                         }
 627                         if (r < 0)
 628                                 return r;
 629
 630                         if (first && all)
 631                                 printf("%s=", name);
 632                         if (!first || all)
 633                                 puts("");
 634
 635                         r = sd_bus_message_exit_container(property);
 636                         if (r < 0)
 637                                 return r;
 638
 639                         return 1;
 640
 641                 } else if (streq(contents, "y")) {
 642                         const uint8_t *u;
 643                         size_t n;
 644
 645                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
 646                         if (r < 0)
 647                                 return r;
 648
 649                         if (all || n > 0) {
 650                                 unsigned int i;
 651
 652                                 printf("%s=", name);
 653
 654                                 for (i = 0; i < n; i++)
 655                                         printf("%02x", u[i]);
 656
 657                                 puts("");
 658                         }
 659
 660                         return 1;
 661
 662                 } else if (streq(contents, "u")) {
 663                         uint32_t *u;
 664                         size_t n;
 665
 666                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
 667                         if (r < 0)
 668                                 return r;
 669
 670                         if (all || n > 0) {
 671                                 unsigned int i;
 672
 673                                 printf("%s=", name);
 674
 675                                 for (i = 0; i < n; i++)
 676                                         printf("%08x", u[i]);
 677
 678                                 puts("");
 679                         }
 680
 681                         return 1;
 682                 }
 683
 684                 break;
 685         }
 686
 687         return 0;
 688 }
 689
 690 int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool all) {
 691         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
 692         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 693         int r;
 694
 695         assert(bus);
 696         assert(path);
 697
 698         r = sd_bus_call_method(bus,
 699                         dest,
 700                         path,
 701                         "org.freedesktop.DBus.Properties",
 702                         "GetAll",
 703                         &error,
 704                         &reply,
 705                         "s", "");
 706         if (r < 0)
 707                 return r;
 708
 709         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
 710         if (r < 0)
 711                 return r;
 712
 713         while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
 714                 const char *name;
 715                 const char *contents;
 716
 717                 r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name);
 718                 if (r < 0)
 719                         return r;
 720
 721                 if (!filter || strv_find(filter, name)) {
 722                         r = sd_bus_message_peek_type(reply, NULL, &contents);
 723                         if (r < 0)
 724                                 return r;
 725
 726                         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
 727                         if (r < 0)
 728                                 return r;
 729
 730                         r = bus_print_property(name, reply, all);
 731                         if (r < 0)
 732                                 return r;
 733                         if (r == 0) {
 734                                 if (all)
 735                                         printf("%s=[unprintable]\n", name);
 736                                 /* skip what we didn't read */
 737                                 r = sd_bus_message_skip(reply, contents);
 738                                 if (r < 0)
 739                                         return r;
 740                         }
 741
 742                         r = sd_bus_message_exit_container(reply);
 743                         if (r < 0)
 744                                 return r;
 745                 } else {
 746                         r = sd_bus_message_skip(reply, "v");
 747                         if (r < 0)
 748                                 return r;
 749                 }
 750
 751                 r = sd_bus_message_exit_container(reply);
 752                 if (r < 0)
 753                         return r;
 754         }
 755         if (r < 0)
 756                 return r;
 757
 758         r = sd_bus_message_exit_container(reply);
 759         if (r < 0)
 760                 return r;
 761
 762         return 0;
 763 }
 764
 765 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
 766         sd_id128_t *p = userdata;
 767         const void *v;
 768         size_t n;
 769         int r;
 770
 771         r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
 772         if (r < 0)
 773                 return r;
 774
 775         if (n == 0)
 776                 *p = SD_ID128_NULL;
 777         else if (n == 16)
 778                 memcpy((*p).bytes, v, n);
 779         else
 780                 return -EINVAL;
 781
 782         return 0;
 783 }
 784
 785 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
 786         char type;
 787         int r;
 788
 789         r = sd_bus_message_peek_type(m, &type, NULL);
 790         if (r < 0)
 791                 return r;
 792
 793         switch (type) {
 794         case SD_BUS_TYPE_STRING: {
 795                 const char *s;
 796                 char *str;
 797                 char **p = userdata;
 798
 799                 r = sd_bus_message_read_basic(m, type, &s);
 800                 if (r < 0)
 801                         break;
 802
 803                 if (isempty(s))
 804                         break;
 805
 806                 str = strdup(s);
 807                 if (!str) {
 808                         r = -ENOMEM;
 809                         break;
 810                 }
 811                 free(*p);
 812                 *p = str;
 813
 814                 break;
 815         }
 816
 817         case SD_BUS_TYPE_ARRAY: {
 818                _cleanup_strv_free_ char **l = NULL;
 819                char ***p = userdata;
 820
 821                 r = bus_message_read_strv_extend(m, &l);
 822                 if (r < 0)
 823                         break;
 824
 825                 strv_free(*p);
 826                 *p = l;
 827                 l = NULL;
 828
 829                 break;
 830         }
 831
 832         case SD_BUS_TYPE_BOOLEAN: {
 833                 unsigned b;
 834                 bool *p = userdata;
 835
 836                 r = sd_bus_message_read_basic(m, type, &b);
 837                 if (r < 0)
 838                         break;
 839
 840                 *p = b;
 841
 842                 break;
 843         }
 844
 845         case SD_BUS_TYPE_UINT32: {
 846                 uint64_t u;
 847                 uint32_t *p = userdata;
 848
 849                 r = sd_bus_message_read_basic(m, type, &u);
 850                 if (r < 0)
 851                         break;
 852
 853                 *p = u;
 854
 855                 break;
 856         }
 857
 858         case SD_BUS_TYPE_UINT64: {
 859                 uint64_t t;
 860                 uint64_t *p = userdata;
 861
 862                 r = sd_bus_message_read_basic(m, type, &t);
 863                 if (r < 0)
 864                         break;
 865
 866                 *p = t;
 867
 868                 break;
 869         }
 870
 871         default:
 872                 break;
 873         }
 874
 875         return r;
 876 }
 877
 878 int bus_map_all_properties(sd_bus *bus,
 879                            const char *destination,
 880                            const char *path,
 881                            const struct bus_properties_map *map,
 882                            void *userdata) {
 883         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 884         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 885         int r;
 886
 887         assert(bus);
 888         assert(destination);
 889         assert(path);
 890         assert(map);
 891
 892         r = sd_bus_call_method( bus,
 893                         destination,
 894                         path,
 895                         "org.freedesktop.DBus.Properties",
 896                         "GetAll",
 897                         &error,
 898                         &m,
 899                         "s", "");
 900         if (r < 0)
 901                 return r;
 902
 903         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
 904         if (r < 0)
 905                 return r;
 906
 907         while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
 908                 const struct bus_properties_map *prop;
 909                 const char *member;
 910                 const char *contents;
 911                 void *v;
 912                 unsigned i;
 913
 914                 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
 915                 if (r < 0)
 916                         return r;
 917
 918                 for (i = 0, prop = NULL; map[i].member; i++)
 919                         if (streq(map[i].member, member)) {
 920                                 prop = &map[i];
 921                                 break;
 922                         }
 923
 924                 if (prop) {
 925                         r = sd_bus_message_peek_type(m, NULL, &contents);
 926                         if (r < 0)
 927                                 return r;
 928
 929                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
 930                         if (r < 0)
 931                                 return r;
 932
 933                         v = (uint8_t *)userdata + prop->offset;
 934                         if (map[i].set)
 935                                 r = prop->set(bus, member, m, &error, v);
 936                         else
 937                                 r = map_basic(bus, member, m, &error, v);
 938
 939                         r = sd_bus_message_exit_container(m);
 940                         if (r < 0)
 941                                 return r;
 942                 } else {
 943                         r = sd_bus_message_skip(m, "v");
 944                         if (r < 0)
 945                                 return r;
 946                 }
 947
 948                 r = sd_bus_message_exit_container(m);
 949                 if (r < 0)
 950                         return r;
 951         }
 952
 953         return r;
 954 }
 955
 956 int bus_open_transport(BusTransport transport, const char *host, bool user, sd_bus **bus) {
 957         int r;
 958
 959         assert(transport >= 0);
 960         assert(transport < _BUS_TRANSPORT_MAX);
 961         assert(bus);
 962
 963         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
 964         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -ENOTSUP);
 965
 966         switch (transport) {
 967
 968         case BUS_TRANSPORT_LOCAL:
 969                 if (user)
 970                         r = sd_bus_default_user(bus);
 971                 else
 972                         r = sd_bus_default_system(bus);
 973
 974                 break;
 975
 976         case BUS_TRANSPORT_REMOTE:
 977                 r = sd_bus_open_system_remote(host, bus);
 978                 break;
 979
 980         case BUS_TRANSPORT_CONTAINER:
 981                 r = sd_bus_open_system_container(host, bus);
 982                 break;
 983
 984         default:
 985                 assert_not_reached("Hmm, unknown transport type.");
 986         }
 987
 988         return r;
 989 }
 990
 991 int bus_open_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
 992         int r;
 993
 994         assert(transport >= 0);
 995         assert(transport < _BUS_TRANSPORT_MAX);
 996         assert(bus);
 997
 998         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
 999         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -ENOTSUP);
1000
1001         switch (transport) {
1002
1003         case BUS_TRANSPORT_LOCAL:
1004                 if (user)
1005                         r = bus_open_user_systemd(bus);
1006                 else
1007                         r = bus_open_system_systemd(bus);
1008
1009                 break;
1010
1011         case BUS_TRANSPORT_REMOTE:
1012                 r = sd_bus_open_system_remote(host, bus);
1013                 break;
1014
1015         case BUS_TRANSPORT_CONTAINER:
1016                 r = sd_bus_open_system_container(host, bus);
1017                 break;
1018
1019         default:
1020                 assert_not_reached("Hmm, unknown transport type.");
1021         }
1022
1023         return r;
1024 }
1025
1026 int bus_property_get_tristate(
1027                 sd_bus *bus,
1028                 const char *path,
1029                 const char *interface,
1030                 const char *property,
1031                 sd_bus_message *reply,
1032                 void *userdata,
1033                 sd_bus_error *error) {
1034
1035         int *tristate = userdata;
1036
1037         return sd_bus_message_append(reply, "b", *tristate > 0);
1038 }
1039
1040 int bus_property_get_bool(
1041                 sd_bus *bus,
1042                 const char *path,
1043                 const char *interface,
1044                 const char *property,
1045                 sd_bus_message *reply,
1046                 void *userdata,
1047                 sd_bus_error *error) {
1048
1049         int b = *(bool*) userdata;
1050
1051         return sd_bus_message_append_basic(reply, 'b', &b);
1052 }
1053
1054 #if __SIZEOF_SIZE_T__ != 8
1055 int bus_property_get_size(
1056                 sd_bus *bus,
1057                 const char *path,
1058                 const char *interface,
1059                 const char *property,
1060                 sd_bus_message *reply,
1061                 void *userdata,
1062                 sd_bus_error *error) {
1063
1064         uint64_t sz = *(size_t*) userdata;
1065
1066         return sd_bus_message_append_basic(reply, 't', &sz);
1067 }
1068 #endif
1069
1070 #if __SIZEOF_LONG__ != 8
1071 int bus_property_get_long(
1072                 sd_bus *bus,
1073                 const char *path,
1074                 const char *interface,
1075                 const char *property,
1076                 sd_bus_message *reply,
1077                 void *userdata,
1078                 sd_bus_error *error) {
1079
1080         int64_t l = *(long*) userdata;
1081
1082         return sd_bus_message_append_basic(reply, 'x', &l);
1083 }
1084
1085 int bus_property_get_ulong(
1086                 sd_bus *bus,
1087                 const char *path,
1088                 const char *interface,
1089                 const char *property,
1090                 sd_bus_message *reply,
1091                 void *userdata,
1092                 sd_bus_error *error) {
1093
1094         uint64_t ul = *(unsigned long*) userdata;
1095
1096         return sd_bus_message_append_basic(reply, 't', &ul);
1097 }
1098 #endif
1099
1100 int bus_log_parse_error(int r) {
1101         log_error("Failed to parse message: %s", strerror(-r));
1102         return r;
1103 }
1104
1105 int bus_log_create_error(int r) {
1106         log_error("Failed to create message: %s", strerror(-r));
1107         return r;
1108 }
1109
1110 int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u) {
1111         assert(message);
1112         assert(u);
1113
1114         return sd_bus_message_read(
1115                         message,
1116                         "(ssssssouso)",
1117                         &u->id,
1118                         &u->description,
1119                         &u->load_state,
1120                         &u->active_state,
1121                         &u->sub_state,
1122                         &u->following,
1123                         &u->unit_path,
1124                         &u->job_id,
1125                         &u->job_type,
1126                         &u->job_path);
1127 }
1128
1129 int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error) {
1130         assert(m);
1131
1132         if (r < 0) {
1133                 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1134                         sd_bus_reply_method_errno(m, r, error);
1135
1136         } else if (sd_bus_error_is_set(error)) {
1137                 if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
1138                         sd_bus_reply_method_error(m, error);
1139         } else
1140                 return r;
1141
1142         log_debug("Failed to process message [type=%s sender=%s path=%s interface=%s member=%s signature=%s]: %s",
1143                   bus_message_type_to_string(m->header->type),
1144                   strna(m->sender),
1145                   strna(m->path),
1146                   strna(m->interface),
1147                   strna(m->member),
1148                   strna(m->root_container.signature),
1149                   bus_error_message(error, r));
1150
1151         return 1;
1152 }