src/shared/bus-util.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <inttypes.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/ioctl.h>
  27 #include <sys/resource.h>
  28 #include <sys/socket.h>
  29 #include <unistd.h>
  30
  31 #include "sd-bus-protocol.h"
  32 #include "sd-bus.h"
  33 #include "sd-daemon.h"
  34 #include "sd-event.h"
  35 #include "sd-id128.h"
  36
  37 #include "alloc-util.h"
  38 #include "bus-internal.h"
  39 #include "bus-label.h"
  40 #include "bus-message.h"
  41 #include "bus-util.h"
  42 #include "def.h"
  43 #include "escape.h"
  44 #include "fd-util.h"
  45 #include "missing.h"
  46 #include "parse-util.h"
  47 #include "proc-cmdline.h"
  48 //#include "rlimit-util.h"
  49 #include "stdio-util.h"
  50 #include "strv.h"
  51 #include "user-util.h"
  52
  53 #if 0 /// UNNEEDED by elogind
  54 static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
  55         sd_event *e = userdata;
  56
  57         assert(m);
  58         assert(e);
  59
  60         sd_bus_close(sd_bus_message_get_bus(m));
  61         sd_event_exit(e, 0);
  62
  63         return 1;
  64 }
  65
  66 int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) {
  67         _cleanup_free_ char *match = NULL;
  68         const char *unique;
  69         int r;
  70
  71         assert(e);
  72         assert(bus);
  73         assert(name);
  74
  75         /* We unregister the name here and then wait for the
  76          * NameOwnerChanged signal for this event to arrive before we
  77          * quit. We do this in order to make sure that any queued
  78          * requests are still processed before we really exit. */
  79
  80         r = sd_bus_get_unique_name(bus, &unique);
  81         if (r < 0)
  82                 return r;
  83
  84         r = asprintf(&match,
  85                      "sender='org.freedesktop.DBus',"
  86                      "type='signal',"
  87                      "interface='org.freedesktop.DBus',"
  88                      "member='NameOwnerChanged',"
  89                      "path='/org/freedesktop/DBus',"
  90                      "arg0='%s',"
  91                      "arg1='%s',"
  92                      "arg2=''", name, unique);
  93         if (r < 0)
  94                 return -ENOMEM;
  95
  96         r = sd_bus_add_match(bus, NULL, match, name_owner_change_callback, e);
  97         if (r < 0)
  98                 return r;
  99
 100         r = sd_bus_release_name(bus, name);
 101         if (r < 0)
 102                 return r;
 103
 104         return 0;
 105 }
 106
 107 int bus_event_loop_with_idle(
 108                 sd_event *e,
 109                 sd_bus *bus,
 110                 const char *name,
 111                 usec_t timeout,
 112                 check_idle_t check_idle,
 113                 void *userdata) {
 114         bool exiting = false;
 115         int r, code;
 116
 117         assert(e);
 118         assert(bus);
 119         assert(name);
 120
 121         for (;;) {
 122                 bool idle;
 123
 124                 r = sd_event_get_state(e);
 125                 if (r < 0)
 126                         return r;
 127                 if (r == SD_EVENT_FINISHED)
 128                         break;
 129
 130                 if (check_idle)
 131                         idle = check_idle(userdata);
 132                 else
 133                         idle = true;
 134
 135                 r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout);
 136                 if (r < 0)
 137                         return r;
 138
 139                 if (r == 0 && !exiting && idle) {
 140
 141                         r = sd_bus_try_close(bus);
 142                         if (r == -EBUSY)
 143                                 continue;
 144
 145                         /* Fallback for dbus1 connections: we
 146                          * unregister the name and wait for the
 147                          * response to come through for it */
 148                         if (r == -EOPNOTSUPP) {
 149
 150                                 /* Inform the service manager that we
 151                                  * are going down, so that it will
 152                                  * queue all further start requests,
 153                                  * instead of assuming we are already
 154                                  * running. */
 155                                 sd_notify(false, "STOPPING=1");
 156
 157                                 r = bus_async_unregister_and_exit(e, bus, name);
 158                                 if (r < 0)
 159                                         return r;
 160
 161                                 exiting = true;
 162                                 continue;
 163                         }
 164
 165                         if (r < 0)
 166                                 return r;
 167
 168                         sd_event_exit(e, 0);
 169                         break;
 170                 }
 171         }
 172
 173         r = sd_event_get_exit_code(e, &code);
 174         if (r < 0)
 175                 return r;
 176
 177         return code;
 178 }
 179 #endif // 0
 180
 181 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
 182         _cleanup_(sd_bus_message_unrefp) sd_bus_message *rep = NULL;
 183         int r, has_owner = 0;
 184
 185         assert(c);
 186         assert(name);
 187
 188         r = sd_bus_call_method(c,
 189                                "org.freedesktop.DBus",
 190                                "/org/freedesktop/dbus",
 191                                "org.freedesktop.DBus",
 192                                "NameHasOwner",
 193                                error,
 194                                &rep,
 195                                "s",
 196                                name);
 197         if (r < 0)
 198                 return r;
 199
 200         r = sd_bus_message_read_basic(rep, 'b', &has_owner);
 201         if (r < 0)
 202                 return sd_bus_error_set_errno(error, r);
 203
 204         return has_owner;
 205 }
 206
 207 static int check_good_user(sd_bus_message *m, uid_t good_user) {
 208         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 209         uid_t sender_uid;
 210         int r;
 211
 212         assert(m);
 213
 214         if (good_user == UID_INVALID)
 215                 return 0;
 216
 217         r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds);
 218         if (r < 0)
 219                 return r;
 220
 221         /* Don't trust augmented credentials for authorization */
 222         assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM);
 223
 224         r = sd_bus_creds_get_euid(creds, &sender_uid);
 225         if (r < 0)
 226                 return r;
 227
 228         return sender_uid == good_user;
 229 }
 230
 231 int bus_test_polkit(
 232                 sd_bus_message *call,
 233                 int capability,
 234                 const char *action,
 235                 const char **details,
 236                 uid_t good_user,
 237                 bool *_challenge,
 238                 sd_bus_error *e) {
 239
 240         int r;
 241
 242         assert(call);
 243         assert(action);
 244
 245         /* Tests non-interactively! */
 246
 247         r = check_good_user(call, good_user);
 248         if (r != 0)
 249                 return r;
 250
 251         r = sd_bus_query_sender_privilege(call, capability);
 252         if (r < 0)
 253                 return r;
 254         else if (r > 0)
 255                 return 1;
 256 #ifdef ENABLE_POLKIT
 257         else {
 258                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *request = NULL;
 259                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 260                 int authorized = false, challenge = false;
 261                 const char *sender, **k, **v;
 262
 263                 sender = sd_bus_message_get_sender(call);
 264                 if (!sender)
 265                         return -EBADMSG;
 266
 267                 r = sd_bus_message_new_method_call(
 268                                 call->bus,
 269                                 &request,
 270                                 "org.freedesktop.PolicyKit1",
 271                                 "/org/freedesktop/PolicyKit1/Authority",
 272                                 "org.freedesktop.PolicyKit1.Authority",
 273                                 "CheckAuthorization");
 274                 if (r < 0)
 275                         return r;
 276
 277                 r = sd_bus_message_append(
 278                                 request,
 279                                 "(sa{sv})s",
 280                                 "system-bus-name", 1, "name", "s", sender,
 281                                 action);
 282                 if (r < 0)
 283                         return r;
 284
 285                 r = sd_bus_message_open_container(request, 'a', "{ss}");
 286                 if (r < 0)
 287                         return r;
 288
 289                 STRV_FOREACH_PAIR(k, v, details) {
 290                         r = sd_bus_message_append(request, "{ss}", *k, *v);
 291                         if (r < 0)
 292                                 return r;
 293                 }
 294
 295                 r = sd_bus_message_close_container(request);
 296                 if (r < 0)
 297                         return r;
 298
 299                 r = sd_bus_message_append(request, "us", 0, NULL);
 300                 if (r < 0)
 301                         return r;
 302
 303                 r = sd_bus_call(call->bus, request, 0, e, &reply);
 304                 if (r < 0) {
 305                         /* Treat no PK available as access denied */
 306                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
 307                                 sd_bus_error_free(e);
 308                                 return -EACCES;
 309                         }
 310
 311                         return r;
 312                 }
 313
 314                 r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
 315                 if (r < 0)
 316                         return r;
 317
 318                 r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
 319                 if (r < 0)
 320                         return r;
 321
 322                 if (authorized)
 323                         return 1;
 324
 325                 if (_challenge) {
 326                         *_challenge = challenge;
 327                         return 0;
 328                 }
 329         }
 330 #endif
 331
 332         return -EACCES;
 333 }
 334
 335 #ifdef ENABLE_POLKIT
 336
 337 typedef struct AsyncPolkitQuery {
 338         sd_bus_message *request, *reply;
 339         sd_bus_message_handler_t callback;
 340         void *userdata;
 341         sd_bus_slot *slot;
 342         Hashmap *registry;
 343 } AsyncPolkitQuery;
 344
 345 static void async_polkit_query_free(AsyncPolkitQuery *q) {
 346
 347         if (!q)
 348                 return;
 349
 350         sd_bus_slot_unref(q->slot);
 351
 352         if (q->registry && q->request)
 353                 hashmap_remove(q->registry, q->request);
 354
 355         sd_bus_message_unref(q->request);
 356         sd_bus_message_unref(q->reply);
 357
 358         free(q);
 359 }
 360
 361 static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
 362         _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
 363         AsyncPolkitQuery *q = userdata;
 364         int r;
 365
 366         assert(reply);
 367         assert(q);
 368
 369         q->slot = sd_bus_slot_unref(q->slot);
 370         q->reply = sd_bus_message_ref(reply);
 371
 372         r = sd_bus_message_rewind(q->request, true);
 373         if (r < 0) {
 374                 r = sd_bus_reply_method_errno(q->request, r, NULL);
 375                 goto finish;
 376         }
 377
 378         r = q->callback(q->request, q->userdata, &error_buffer);
 379         r = bus_maybe_reply_error(q->request, r, &error_buffer);
 380
 381 finish:
 382         async_polkit_query_free(q);
 383
 384         return r;
 385 }
 386
 387 #endif
 388
 389 int bus_verify_polkit_async(
 390                 sd_bus_message *call,
 391                 int capability,
 392                 const char *action,
 393                 const char **details,
 394                 bool interactive,
 395                 uid_t good_user,
 396                 Hashmap **registry,
 397                 sd_bus_error *error) {
 398
 399 #ifdef ENABLE_POLKIT
 400         _cleanup_(sd_bus_message_unrefp) sd_bus_message *pk = NULL;
 401         AsyncPolkitQuery *q;
 402         const char *sender, **k, **v;
 403         sd_bus_message_handler_t callback;
 404         void *userdata;
 405         int c;
 406 #endif
 407         int r;
 408
 409         assert(call);
 410         assert(action);
 411         assert(registry);
 412
 413         r = check_good_user(call, good_user);
 414         if (r != 0)
 415                 return r;
 416
 417 #ifdef ENABLE_POLKIT
 418         q = hashmap_get(*registry, call);
 419         if (q) {
 420                 int authorized, challenge;
 421
 422                 /* This is the second invocation of this function, and
 423                  * there's already a response from polkit, let's
 424                  * process it */
 425                 assert(q->reply);
 426
 427                 if (sd_bus_message_is_method_error(q->reply, NULL)) {
 428                         const sd_bus_error *e;
 429
 430                         /* Copy error from polkit reply */
 431                         e = sd_bus_message_get_error(q->reply);
 432                         sd_bus_error_copy(error, e);
 433
 434                         /* Treat no PK available as access denied */
 435                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
 436                                 return -EACCES;
 437
 438                         return -sd_bus_error_get_errno(e);
 439                 }
 440
 441                 r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
 442                 if (r >= 0)
 443                         r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
 444
 445                 if (r < 0)
 446                         return r;
 447
 448                 if (authorized)
 449                         return 1;
 450
 451                 if (challenge)
 452                         return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required.");
 453
 454                 return -EACCES;
 455         }
 456 #endif
 457
 458         r = sd_bus_query_sender_privilege(call, capability);
 459         if (r < 0)
 460                 return r;
 461         else if (r > 0)
 462                 return 1;
 463
 464 #ifdef ENABLE_POLKIT
 465         if (sd_bus_get_current_message(call->bus) != call)
 466                 return -EINVAL;
 467
 468         callback = sd_bus_get_current_handler(call->bus);
 469         if (!callback)
 470                 return -EINVAL;
 471
 472         userdata = sd_bus_get_current_userdata(call->bus);
 473
 474         sender = sd_bus_message_get_sender(call);
 475         if (!sender)
 476                 return -EBADMSG;
 477
 478         c = sd_bus_message_get_allow_interactive_authorization(call);
 479         if (c < 0)
 480                 return c;
 481         if (c > 0)
 482                 interactive = true;
 483
 484         r = hashmap_ensure_allocated(registry, NULL);
 485         if (r < 0)
 486                 return r;
 487
 488         r = sd_bus_message_new_method_call(
 489                         call->bus,
 490                         &pk,
 491                         "org.freedesktop.PolicyKit1",
 492                         "/org/freedesktop/PolicyKit1/Authority",
 493                         "org.freedesktop.PolicyKit1.Authority",
 494                         "CheckAuthorization");
 495         if (r < 0)
 496                 return r;
 497
 498         r = sd_bus_message_append(
 499                         pk,
 500                         "(sa{sv})s",
 501                         "system-bus-name", 1, "name", "s", sender,
 502                         action);
 503         if (r < 0)
 504                 return r;
 505
 506         r = sd_bus_message_open_container(pk, 'a', "{ss}");
 507         if (r < 0)
 508                 return r;
 509
 510         STRV_FOREACH_PAIR(k, v, details) {
 511                 r = sd_bus_message_append(pk, "{ss}", *k, *v);
 512                 if (r < 0)
 513                         return r;
 514         }
 515
 516         r = sd_bus_message_close_container(pk);
 517         if (r < 0)
 518                 return r;
 519
 520         r = sd_bus_message_append(pk, "us", !!interactive, NULL);
 521         if (r < 0)
 522                 return r;
 523
 524         q = new0(AsyncPolkitQuery, 1);
 525         if (!q)
 526                 return -ENOMEM;
 527
 528         q->request = sd_bus_message_ref(call);
 529         q->callback = callback;
 530         q->userdata = userdata;
 531
 532         r = hashmap_put(*registry, call, q);
 533         if (r < 0) {
 534                 async_polkit_query_free(q);
 535                 return r;
 536         }
 537
 538         q->registry = *registry;
 539
 540         r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0);
 541         if (r < 0) {
 542                 async_polkit_query_free(q);
 543                 return r;
 544         }
 545
 546         return 0;
 547 #endif
 548
 549         return -EACCES;
 550 }
 551
 552 void bus_verify_polkit_async_registry_free(Hashmap *registry) {
 553 #ifdef ENABLE_POLKIT
 554         AsyncPolkitQuery *q;
 555
 556         while ((q = hashmap_steal_first(registry)))
 557                 async_polkit_query_free(q);
 558
 559         hashmap_free(registry);
 560 #endif
 561 }
 562
 563 #if 0 /// UNNEEDED by elogind
 564 int bus_check_peercred(sd_bus *c) {
 565         struct ucred ucred;
 566         socklen_t l;
 567         int fd;
 568
 569         assert(c);
 570
 571         fd = sd_bus_get_fd(c);
 572         if (fd < 0)
 573                 return fd;
 574
 575         l = sizeof(struct ucred);
 576         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 577                 return -errno;
 578
 579         if (l != sizeof(struct ucred))
 580                 return -E2BIG;
 581
 582         if (ucred.uid != 0 && ucred.uid != geteuid())
 583                 return -EPERM;
 584
 585         return 1;
 586 }
 587
 588 int bus_connect_system_systemd(sd_bus **_bus) {
 589         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 590         int r;
 591
 592         assert(_bus);
 593
 594         if (geteuid() != 0)
 595                 return sd_bus_default_system(_bus);
 596
 597         /* If we are root and kdbus is not available, then let's talk
 598          * directly to the system instance, instead of going via the
 599          * bus */
 600
 601         r = sd_bus_new(&bus);
 602         if (r < 0)
 603                 return r;
 604
 605         r = sd_bus_set_address(bus, KERNEL_SYSTEM_BUS_ADDRESS);
 606         if (r < 0)
 607                 return r;
 608
 609         bus->bus_client = true;
 610
 611         r = sd_bus_start(bus);
 612         if (r >= 0) {
 613                 *_bus = bus;
 614                 bus = NULL;
 615                 return 0;
 616         }
 617
 618         bus = sd_bus_unref(bus);
 619
 620         r = sd_bus_new(&bus);
 621         if (r < 0)
 622                 return r;
 623
 624         r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
 625         if (r < 0)
 626                 return r;
 627
 628         r = sd_bus_start(bus);
 629         if (r < 0)
 630                 return sd_bus_default_system(_bus);
 631
 632         r = bus_check_peercred(bus);
 633         if (r < 0)
 634                 return r;
 635
 636         *_bus = bus;
 637         bus = NULL;
 638
 639         return 0;
 640 }
 641
 642 int bus_connect_user_systemd(sd_bus **_bus) {
 643         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 644         _cleanup_free_ char *ee = NULL;
 645         const char *e;
 646         int r;
 647
 648         /* Try via kdbus first, and then directly */
 649
 650         assert(_bus);
 651
 652         r = sd_bus_new(&bus);
 653         if (r < 0)
 654                 return r;
 655
 656         if (asprintf(&bus->address, KERNEL_USER_BUS_ADDRESS_FMT, getuid()) < 0)
 657                 return -ENOMEM;
 658
 659         bus->bus_client = true;
 660
 661         r = sd_bus_start(bus);
 662         if (r >= 0) {
 663                 *_bus = bus;
 664                 bus = NULL;
 665                 return 0;
 666         }
 667
 668         bus = sd_bus_unref(bus);
 669
 670         e = secure_getenv("XDG_RUNTIME_DIR");
 671         if (!e)
 672                 return sd_bus_default_user(_bus);
 673
 674         ee = bus_address_escape(e);
 675         if (!ee)
 676                 return -ENOMEM;
 677
 678         r = sd_bus_new(&bus);
 679         if (r < 0)
 680                 return r;
 681
 682         bus->address = strjoin("unix:path=", ee, "/systemd/private", NULL);
 683         if (!bus->address)
 684                 return -ENOMEM;
 685
 686         r = sd_bus_start(bus);
 687         if (r < 0)
 688                 return sd_bus_default_user(_bus);
 689
 690         r = bus_check_peercred(bus);
 691         if (r < 0)
 692                 return r;
 693
 694         *_bus = bus;
 695         bus = NULL;
 696
 697         return 0;
 698 }
 699 #endif // 0
 700
 701 #define print_property(name, fmt, ...)                                  \
 702         do {                                                            \
 703                 if (value)                                              \
 704                         printf(fmt "\n", __VA_ARGS__);                  \
 705                 else                                                    \
 706                         printf("%s=" fmt "\n", name, __VA_ARGS__);      \
 707         } while(0)
 708
 709 int bus_print_property(const char *name, sd_bus_message *property, bool value, bool all) {
 710         char type;
 711         const char *contents;
 712         int r;
 713
 714         assert(name);
 715         assert(property);
 716
 717         r = sd_bus_message_peek_type(property, &type, &contents);
 718         if (r < 0)
 719                 return r;
 720
 721         switch (type) {
 722
 723         case SD_BUS_TYPE_STRING: {
 724                 const char *s;
 725
 726                 r = sd_bus_message_read_basic(property, type, &s);
 727                 if (r < 0)
 728                         return r;
 729
 730                 if (all || !isempty(s)) {
 731                         _cleanup_free_ char *escaped = NULL;
 732
 733                         escaped = xescape(s, "\n");
 734                         if (!escaped)
 735                                 return -ENOMEM;
 736
 737                         print_property(name, "%s", escaped);
 738                 }
 739
 740                 return 1;
 741         }
 742
 743         case SD_BUS_TYPE_BOOLEAN: {
 744                 int b;
 745
 746                 r = sd_bus_message_read_basic(property, type, &b);
 747                 if (r < 0)
 748                         return r;
 749
 750                 print_property(name, "%s", yes_no(b));
 751
 752                 return 1;
 753         }
 754
 755         case SD_BUS_TYPE_UINT64: {
 756                 uint64_t u;
 757
 758                 r = sd_bus_message_read_basic(property, type, &u);
 759                 if (r < 0)
 760                         return r;
 761
 762                 /* Yes, heuristics! But we can change this check
 763                  * should it turn out to not be sufficient */
 764
 765                 if (endswith(name, "Timestamp")) {
 766                         char timestamp[FORMAT_TIMESTAMP_MAX], *t;
 767
 768                         t = format_timestamp(timestamp, sizeof(timestamp), u);
 769                         if (t || all)
 770                                 print_property(name, "%s", strempty(t));
 771
 772                 } else if (strstr(name, "USec")) {
 773                         char timespan[FORMAT_TIMESPAN_MAX];
 774
 775                         print_property(name, "%s", format_timespan(timespan, sizeof(timespan), u, 0));
 776                 } else
 777                         print_property(name, "%"PRIu64, u);
 778
 779                 return 1;
 780         }
 781
 782         case SD_BUS_TYPE_INT64: {
 783                 int64_t i;
 784
 785                 r = sd_bus_message_read_basic(property, type, &i);
 786                 if (r < 0)
 787                         return r;
 788
 789                 print_property(name, "%"PRIi64, i);
 790
 791                 return 1;
 792         }
 793
 794         case SD_BUS_TYPE_UINT32: {
 795                 uint32_t u;
 796
 797                 r = sd_bus_message_read_basic(property, type, &u);
 798                 if (r < 0)
 799                         return r;
 800
 801                 if (strstr(name, "UMask") || strstr(name, "Mode"))
 802                         print_property(name, "%04o", u);
 803                 else
 804                         print_property(name, "%"PRIu32, u);
 805
 806                 return 1;
 807         }
 808
 809         case SD_BUS_TYPE_INT32: {
 810                 int32_t i;
 811
 812                 r = sd_bus_message_read_basic(property, type, &i);
 813                 if (r < 0)
 814                         return r;
 815
 816                 print_property(name, "%"PRIi32, i);
 817                 return 1;
 818         }
 819
 820         case SD_BUS_TYPE_DOUBLE: {
 821                 double d;
 822
 823                 r = sd_bus_message_read_basic(property, type, &d);
 824                 if (r < 0)
 825                         return r;
 826
 827                 print_property(name, "%g", d);
 828                 return 1;
 829         }
 830
 831         case SD_BUS_TYPE_ARRAY:
 832                 if (streq(contents, "s")) {
 833                         bool first = true;
 834                         const char *str;
 835
 836                         r = sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents);
 837                         if (r < 0)
 838                                 return r;
 839
 840                         while ((r = sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) > 0) {
 841                                 _cleanup_free_ char *escaped = NULL;
 842
 843                                 if (first && !value)
 844                                         printf("%s=", name);
 845
 846                                 escaped = xescape(str, "\n ");
 847                                 if (!escaped)
 848                                         return -ENOMEM;
 849
 850                                 printf("%s%s", first ? "" : " ", escaped);
 851
 852                                 first = false;
 853                         }
 854                         if (r < 0)
 855                                 return r;
 856
 857                         if (first && all && !value)
 858                                 printf("%s=", name);
 859                         if (!first || all)
 860                                 puts("");
 861
 862                         r = sd_bus_message_exit_container(property);
 863                         if (r < 0)
 864                                 return r;
 865
 866                         return 1;
 867
 868                 } else if (streq(contents, "y")) {
 869                         const uint8_t *u;
 870                         size_t n;
 871
 872                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
 873                         if (r < 0)
 874                                 return r;
 875
 876                         if (all || n > 0) {
 877                                 unsigned int i;
 878
 879                                 if (!value)
 880                                         printf("%s=", name);
 881
 882                                 for (i = 0; i < n; i++)
 883                                         printf("%02x", u[i]);
 884
 885                                 puts("");
 886                         }
 887
 888                         return 1;
 889
 890                 } else if (streq(contents, "u")) {
 891                         uint32_t *u;
 892                         size_t n;
 893
 894                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
 895                         if (r < 0)
 896                                 return r;
 897
 898                         if (all || n > 0) {
 899                                 unsigned int i;
 900
 901                                 if (!value)
 902                                         printf("%s=", name);
 903
 904                                 for (i = 0; i < n; i++)
 905                                         printf("%08x", u[i]);
 906
 907                                 puts("");
 908                         }
 909
 910                         return 1;
 911                 }
 912
 913                 break;
 914         }
 915
 916         return 0;
 917 }
 918
 919 int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool value, bool all) {
 920         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 921         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 922         int r;
 923
 924         assert(bus);
 925         assert(path);
 926
 927         r = sd_bus_call_method(bus,
 928                         dest,
 929                         path,
 930                         "org.freedesktop.DBus.Properties",
 931                         "GetAll",
 932                         &error,
 933                         &reply,
 934                         "s", "");
 935         if (r < 0)
 936                 return r;
 937
 938         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
 939         if (r < 0)
 940                 return r;
 941
 942         while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
 943                 const char *name;
 944                 const char *contents;
 945
 946                 r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name);
 947                 if (r < 0)
 948                         return r;
 949
 950                 if (!filter || strv_find(filter, name)) {
 951                         r = sd_bus_message_peek_type(reply, NULL, &contents);
 952                         if (r < 0)
 953                                 return r;
 954
 955                         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
 956                         if (r < 0)
 957                                 return r;
 958
 959                         r = bus_print_property(name, reply, value, all);
 960                         if (r < 0)
 961                                 return r;
 962                         if (r == 0) {
 963                                 if (all)
 964                                         printf("%s=[unprintable]\n", name);
 965                                 /* skip what we didn't read */
 966                                 r = sd_bus_message_skip(reply, contents);
 967                                 if (r < 0)
 968                                         return r;
 969                         }
 970
 971                         r = sd_bus_message_exit_container(reply);
 972                         if (r < 0)
 973                                 return r;
 974                 } else {
 975                         r = sd_bus_message_skip(reply, "v");
 976                         if (r < 0)
 977                                 return r;
 978                 }
 979
 980                 r = sd_bus_message_exit_container(reply);
 981                 if (r < 0)
 982                         return r;
 983         }
 984         if (r < 0)
 985                 return r;
 986
 987         r = sd_bus_message_exit_container(reply);
 988         if (r < 0)
 989                 return r;
 990
 991         return 0;
 992 }
 993
 994 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
 995         sd_id128_t *p = userdata;
 996         const void *v;
 997         size_t n;
 998         int r;
 999
1000         r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
1001         if (r < 0)
1002                 return r;
1003
1004         if (n == 0)
1005                 *p = SD_ID128_NULL;
1006         else if (n == 16)
1007                 memcpy((*p).bytes, v, n);
1008         else
1009                 return -EINVAL;
1010
1011         return 0;
1012 }
1013
1014 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1015         char type;
1016         int r;
1017
1018         r = sd_bus_message_peek_type(m, &type, NULL);
1019         if (r < 0)
1020                 return r;
1021
1022         switch (type) {
1023         case SD_BUS_TYPE_STRING: {
1024                 const char *s;
1025                 char **p = userdata;
1026
1027                 r = sd_bus_message_read_basic(m, type, &s);
1028                 if (r < 0)
1029                         break;
1030
1031                 if (isempty(s))
1032                         break;
1033
1034                 r = free_and_strdup(p, s);
1035                 break;
1036         }
1037
1038         case SD_BUS_TYPE_ARRAY: {
1039                 _cleanup_strv_free_ char **l = NULL;
1040                 char ***p = userdata;
1041
1042                 r = bus_message_read_strv_extend(m, &l);
1043                 if (r < 0)
1044                         break;
1045
1046                 strv_free(*p);
1047                 *p = l;
1048                 l = NULL;
1049
1050                 break;
1051         }
1052
1053         case SD_BUS_TYPE_BOOLEAN: {
1054                 unsigned b;
1055                 int *p = userdata;
1056
1057                 r = sd_bus_message_read_basic(m, type, &b);
1058                 if (r < 0)
1059                         break;
1060
1061                 *p = b;
1062
1063                 break;
1064         }
1065
1066         case SD_BUS_TYPE_UINT32: {
1067                 uint32_t u;
1068                 uint32_t *p = userdata;
1069
1070                 r = sd_bus_message_read_basic(m, type, &u);
1071                 if (r < 0)
1072                         break;
1073
1074                 *p = u;
1075
1076                 break;
1077         }
1078
1079         case SD_BUS_TYPE_UINT64: {
1080                 uint64_t t;
1081                 uint64_t *p = userdata;
1082
1083                 r = sd_bus_message_read_basic(m, type, &t);
1084                 if (r < 0)
1085                         break;
1086
1087                 *p = t;
1088
1089                 break;
1090         }
1091
1092         case SD_BUS_TYPE_DOUBLE: {
1093                 double d;
1094                 double *p = userdata;
1095
1096                 r = sd_bus_message_read_basic(m, type, &d);
1097                 if (r < 0)
1098                         break;
1099
1100                 *p = d;
1101
1102                 break;
1103         }
1104
1105         default:
1106                 break;
1107         }
1108
1109         return r;
1110 }
1111
1112 int bus_message_map_all_properties(
1113                 sd_bus_message *m,
1114                 const struct bus_properties_map *map,
1115                 void *userdata) {
1116
1117         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1118         int r;
1119
1120         assert(m);
1121         assert(map);
1122
1123         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
1124         if (r < 0)
1125                 return r;
1126
1127         while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
1128                 const struct bus_properties_map *prop;
1129                 const char *member;
1130                 const char *contents;
1131                 void *v;
1132                 unsigned i;
1133
1134                 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
1135                 if (r < 0)
1136                         return r;
1137
1138                 for (i = 0, prop = NULL; map[i].member; i++)
1139                         if (streq(map[i].member, member)) {
1140                                 prop = &map[i];
1141                                 break;
1142                         }
1143
1144                 if (prop) {
1145                         r = sd_bus_message_peek_type(m, NULL, &contents);
1146                         if (r < 0)
1147                                 return r;
1148
1149                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
1150                         if (r < 0)
1151                                 return r;
1152
1153                         v = (uint8_t *)userdata + prop->offset;
1154                         if (map[i].set)
1155                                 r = prop->set(sd_bus_message_get_bus(m), member, m, &error, v);
1156                         else
1157                                 r = map_basic(sd_bus_message_get_bus(m), member, m, &error, v);
1158                         if (r < 0)
1159                                 return r;
1160
1161                         r = sd_bus_message_exit_container(m);
1162                         if (r < 0)
1163                                 return r;
1164                 } else {
1165                         r = sd_bus_message_skip(m, "v");
1166                         if (r < 0)
1167                                 return r;
1168                 }
1169
1170                 r = sd_bus_message_exit_container(m);
1171                 if (r < 0)
1172                         return r;
1173         }
1174         if (r < 0)
1175                 return r;
1176
1177         return sd_bus_message_exit_container(m);
1178 }
1179
1180 #if 0 /// UNNEEDED by elogind
1181 int bus_message_map_properties_changed(
1182                 sd_bus_message *m,
1183                 const struct bus_properties_map *map,
1184                 void *userdata) {
1185
1186         const char *member;
1187         int r, invalidated, i;
1188
1189         assert(m);
1190         assert(map);
1191
1192         r = bus_message_map_all_properties(m, map, userdata);
1193         if (r < 0)
1194                 return r;
1195
1196         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
1197         if (r < 0)
1198                 return r;
1199
1200         invalidated = 0;
1201         while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
1202                 for (i = 0; map[i].member; i++)
1203                         if (streq(map[i].member, member)) {
1204                                 ++invalidated;
1205                                 break;
1206                         }
1207         if (r < 0)
1208                 return r;
1209
1210         r = sd_bus_message_exit_container(m);
1211         if (r < 0)
1212                 return r;
1213
1214         return invalidated;
1215 }
1216 #endif // 0
1217
1218 int bus_map_all_properties(
1219                 sd_bus *bus,
1220                 const char *destination,
1221                 const char *path,
1222                 const struct bus_properties_map *map,
1223                 void *userdata) {
1224
1225         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1226         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1227         int r;
1228
1229         assert(bus);
1230         assert(destination);
1231         assert(path);
1232         assert(map);
1233
1234         r = sd_bus_call_method(
1235                         bus,
1236                         destination,
1237                         path,
1238                         "org.freedesktop.DBus.Properties",
1239                         "GetAll",
1240                         &error,
1241                         &m,
1242                         "s", "");
1243         if (r < 0)
1244                 return r;
1245
1246         return bus_message_map_all_properties(m, map, userdata);
1247 }
1248
1249 int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1250         int r;
1251
1252         assert(transport >= 0);
1253         assert(transport < _BUS_TRANSPORT_MAX);
1254         assert(bus);
1255
1256         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1257         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1258
1259         switch (transport) {
1260
1261         case BUS_TRANSPORT_LOCAL:
1262 #if 0 /// elogind does not support a user bus
1263                 if (user)
1264                         r = sd_bus_default_user(bus);
1265                 else
1266 #endif // 0
1267                         r = sd_bus_default_system(bus);
1268
1269                 break;
1270
1271         case BUS_TRANSPORT_REMOTE:
1272                 r = sd_bus_open_system_remote(bus, host);
1273                 break;
1274
1275         case BUS_TRANSPORT_MACHINE:
1276                 r = sd_bus_open_system_machine(bus, host);
1277                 break;
1278
1279         default:
1280                 assert_not_reached("Hmm, unknown transport type.");
1281         }
1282
1283         return r;
1284 }
1285
1286 #if 0 /// UNNEEDED by elogind
1287 int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1288         int r;
1289
1290         assert(transport >= 0);
1291         assert(transport < _BUS_TRANSPORT_MAX);
1292         assert(bus);
1293
1294         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1295         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1296
1297         switch (transport) {
1298
1299         case BUS_TRANSPORT_LOCAL:
1300                 if (user)
1301                         r = bus_connect_user_systemd(bus);
1302                 else
1303                         r = bus_connect_system_systemd(bus);
1304
1305                 break;
1306
1307         case BUS_TRANSPORT_REMOTE:
1308                 r = sd_bus_open_system_remote(bus, host);
1309                 break;
1310
1311         case BUS_TRANSPORT_MACHINE:
1312                 r = sd_bus_open_system_machine(bus, host);
1313                 break;
1314
1315         default:
1316                 assert_not_reached("Hmm, unknown transport type.");
1317         }
1318
1319         return r;
1320 }
1321 #endif // 0
1322
1323 int bus_property_get_bool(
1324                 sd_bus *bus,
1325                 const char *path,
1326                 const char *interface,
1327                 const char *property,
1328                 sd_bus_message *reply,
1329                 void *userdata,
1330                 sd_bus_error *error) {
1331
1332         int b = *(bool*) userdata;
1333
1334         return sd_bus_message_append_basic(reply, 'b', &b);
1335 }
1336
1337 #if __SIZEOF_SIZE_T__ != 8
1338 int bus_property_get_size(
1339                 sd_bus *bus,
1340                 const char *path,
1341                 const char *interface,
1342                 const char *property,
1343                 sd_bus_message *reply,
1344                 void *userdata,
1345                 sd_bus_error *error) {
1346
1347         uint64_t sz = *(size_t*) userdata;
1348
1349         return sd_bus_message_append_basic(reply, 't', &sz);
1350 }
1351 #endif
1352
1353 #if __SIZEOF_LONG__ != 8
1354 int bus_property_get_long(
1355                 sd_bus *bus,
1356                 const char *path,
1357                 const char *interface,
1358                 const char *property,
1359                 sd_bus_message *reply,
1360                 void *userdata,
1361                 sd_bus_error *error) {
1362
1363         int64_t l = *(long*) userdata;
1364
1365         return sd_bus_message_append_basic(reply, 'x', &l);
1366 }
1367
1368 int bus_property_get_ulong(
1369                 sd_bus *bus,
1370                 const char *path,
1371                 const char *interface,
1372                 const char *property,
1373                 sd_bus_message *reply,
1374                 void *userdata,
1375                 sd_bus_error *error) {
1376
1377         uint64_t ul = *(unsigned long*) userdata;
1378
1379         return sd_bus_message_append_basic(reply, 't', &ul);
1380 }
1381 #endif
1382
1383 int bus_log_parse_error(int r) {
1384         return log_error_errno(r, "Failed to parse bus message: %m");
1385 }
1386
1387 #if 0 /// UNNEEDED by elogind
1388 int bus_log_create_error(int r) {
1389         return log_error_errno(r, "Failed to create bus message: %m");
1390 }
1391
1392 #endif // 0
1393 #if 0 /// UNNEEDED by elogind
1394 /**
1395  * bus_path_encode_unique() - encode unique object path
1396  * @b: bus connection or NULL
1397  * @prefix: object path prefix
1398  * @sender_id: unique-name of client, or NULL
1399  * @external_id: external ID to be chosen by client, or NULL
1400  * @ret_path: storage for encoded object path pointer
1401  *
1402  * Whenever we provide a bus API that allows clients to create and manage
1403  * server-side objects, we need to provide a unique name for these objects. If
1404  * we let the server choose the name, we suffer from a race condition: If a
1405  * client creates an object asynchronously, it cannot destroy that object until
1406  * it received the method reply. It cannot know the name of the new object,
1407  * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
1408  *
1409  * Therefore, many APIs allow the client to choose the unique name for newly
1410  * created objects. There're two problems to solve, though:
1411  *    1) Object names are usually defined via dbus object paths, which are
1412  *       usually globally namespaced. Therefore, multiple clients must be able
1413  *       to choose unique object names without interference.
1414  *    2) If multiple libraries share the same bus connection, they must be
1415  *       able to choose unique object names without interference.
1416  * The first problem is solved easily by prefixing a name with the
1417  * unique-bus-name of a connection. The server side must enforce this and
1418  * reject any other name. The second problem is solved by providing unique
1419  * suffixes from within sd-bus.
1420  *
1421  * This helper allows clients to create unique object-paths. It uses the
1422  * template '/prefix/sender_id/external_id' and returns the new path in
1423  * @ret_path (must be freed by the caller).
1424  * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
1425  * NULL, this function allocates a unique suffix via @b (by requesting a new
1426  * cookie). If both @sender_id and @external_id are given, @b can be passed as
1427  * NULL.
1428  *
1429  * Returns: 0 on success, negative error code on failure.
1430  */
1431 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
1432         _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
1433         char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
1434         int r;
1435
1436         assert_return(b || (sender_id && external_id), -EINVAL);
1437         assert_return(object_path_is_valid(prefix), -EINVAL);
1438         assert_return(ret_path, -EINVAL);
1439
1440         if (!sender_id) {
1441                 r = sd_bus_get_unique_name(b, &sender_id);
1442                 if (r < 0)
1443                         return r;
1444         }
1445
1446         if (!external_id) {
1447                 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
1448                 external_id = external_buf;
1449         }
1450
1451         sender_label = bus_label_escape(sender_id);
1452         if (!sender_label)
1453                 return -ENOMEM;
1454
1455         external_label = bus_label_escape(external_id);
1456         if (!external_label)
1457                 return -ENOMEM;
1458
1459         p = strjoin(prefix, "/", sender_label, "/", external_label, NULL);
1460         if (!p)
1461                 return -ENOMEM;
1462
1463         *ret_path = p;
1464         return 0;
1465 }
1466
1467 /**
1468  * bus_path_decode_unique() - decode unique object path
1469  * @path: object path to decode
1470  * @prefix: object path prefix
1471  * @ret_sender: output parameter for sender-id label
1472  * @ret_external: output parameter for external-id label
1473  *
1474  * This does the reverse of bus_path_encode_unique() (see its description for
1475  * details). Both trailing labels, sender-id and external-id, are unescaped and
1476  * returned in the given output parameters (the caller must free them).
1477  *
1478  * Note that this function returns 0 if the path does not match the template
1479  * (see bus_path_encode_unique()), 1 if it matched.
1480  *
1481  * Returns: Negative error code on failure, 0 if the given object path does not
1482  *          match the template (return parameters are set to NULL), 1 if it was
1483  *          parsed successfully (return parameters contain allocated labels).
1484  */
1485 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
1486         const char *p, *q;
1487         char *sender, *external;
1488
1489         assert(object_path_is_valid(path));
1490         assert(object_path_is_valid(prefix));
1491         assert(ret_sender);
1492         assert(ret_external);
1493
1494         p = object_path_startswith(path, prefix);
1495         if (!p) {
1496                 *ret_sender = NULL;
1497                 *ret_external = NULL;
1498                 return 0;
1499         }
1500
1501         q = strchr(p, '/');
1502         if (!q) {
1503                 *ret_sender = NULL;
1504                 *ret_external = NULL;
1505                 return 0;
1506         }
1507
1508         sender = bus_label_unescape_n(p, q - p);
1509         external = bus_label_unescape(q + 1);
1510         if (!sender || !external) {
1511                 free(sender);
1512                 free(external);
1513                 return -ENOMEM;
1514         }
1515
1516         *ret_sender = sender;
1517         *ret_external = external;
1518         return 1;
1519 }
1520 #endif // 0
1521
1522 #if 0 /// UNNEEDED by elogind
1523 int bus_property_get_rlimit(
1524                 sd_bus *bus,
1525                 const char *path,
1526                 const char *interface,
1527                 const char *property,
1528                 sd_bus_message *reply,
1529                 void *userdata,
1530                 sd_bus_error *error) {
1531
1532         struct rlimit *rl;
1533         uint64_t u;
1534         rlim_t x;
1535         const char *is_soft;
1536
1537         assert(bus);
1538         assert(reply);
1539         assert(userdata);
1540
1541         is_soft = endswith(property, "Soft");
1542         rl = *(struct rlimit**) userdata;
1543         if (rl)
1544                 x = is_soft ? rl->rlim_cur : rl->rlim_max;
1545         else {
1546                 struct rlimit buf = {};
1547                 int z;
1548                 const char *s;
1549
1550                 s = is_soft ? strndupa(property, is_soft - property) : property;
1551
1552                 z = rlimit_from_string(strstr(s, "Limit"));
1553                 assert(z >= 0);
1554
1555                 getrlimit(z, &buf);
1556                 x = is_soft ? buf.rlim_cur : buf.rlim_max;
1557         }
1558
1559         /* rlim_t might have different sizes, let's map
1560          * RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on
1561          * all archs */
1562         u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
1563
1564         return sd_bus_message_append(reply, "t", u);
1565 }
1566 #endif // 0