src/shared/bus-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2013 Lennart Poettering
   6 ***/
   7
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <inttypes.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/resource.h>
  16 #include <sys/socket.h>
  17 #include <unistd.h>
  18
  19 #include "sd-bus-protocol.h"
  20 #include "sd-bus.h"
  21 #include "sd-daemon.h"
  22 #include "sd-event.h"
  23 #include "sd-id128.h"
  24
  25 #include "alloc-util.h"
  26 #include "bus-internal.h"
  27 #include "bus-label.h"
  28 #include "bus-message.h"
  29 #include "bus-util.h"
  30 #include "cap-list.h"
  31 #include "cgroup-util.h"
  32 #include "def.h"
  33 #include "escape.h"
  34 #include "fd-util.h"
  35 #include "missing.h"
  36 #include "mount-util.h"
  37 #include "nsflags.h"
  38 #include "parse-util.h"
  39 #include "proc-cmdline.h"
  40 //#include "rlimit-util.h"
  41 #include "stdio-util.h"
  42 #include "strv.h"
  43 #include "user-util.h"
  44
  45 #if 0 /// UNNEEDED by elogind
  46 static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
  47         sd_event *e = userdata;
  48
  49         assert(m);
  50         assert(e);
  51
  52         sd_bus_close(sd_bus_message_get_bus(m));
  53         sd_event_exit(e, 0);
  54
  55         return 1;
  56 }
  57
  58 int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) {
  59         const char *match;
  60         const char *unique;
  61         int r;
  62
  63         assert(e);
  64         assert(bus);
  65         assert(name);
  66
  67         /* We unregister the name here and then wait for the
  68          * NameOwnerChanged signal for this event to arrive before we
  69          * quit. We do this in order to make sure that any queued
  70          * requests are still processed before we really exit. */
  71
  72         r = sd_bus_get_unique_name(bus, &unique);
  73         if (r < 0)
  74                 return r;
  75
  76         match = strjoina(
  77                         "sender='org.freedesktop.DBus',"
  78                         "type='signal',"
  79                         "interface='org.freedesktop.DBus',"
  80                         "member='NameOwnerChanged',"
  81                         "path='/org/freedesktop/DBus',"
  82                         "arg0='", name, "',",
  83                         "arg1='", unique, "',",
  84                         "arg2=''");
  85
  86         r = sd_bus_add_match_async(bus, NULL, match, name_owner_change_callback, NULL, e);
  87         if (r < 0)
  88                 return r;
  89
  90         r = sd_bus_release_name_async(bus, NULL, name, NULL, NULL);
  91         if (r < 0)
  92                 return r;
  93
  94         return 0;
  95 }
  96
  97 int bus_event_loop_with_idle(
  98                 sd_event *e,
  99                 sd_bus *bus,
 100                 const char *name,
 101                 usec_t timeout,
 102                 check_idle_t check_idle,
 103                 void *userdata) {
 104         bool exiting = false;
 105         int r, code;
 106
 107         assert(e);
 108         assert(bus);
 109         assert(name);
 110
 111         for (;;) {
 112                 bool idle;
 113
 114                 r = sd_event_get_state(e);
 115                 if (r < 0)
 116                         return r;
 117                 if (r == SD_EVENT_FINISHED)
 118                         break;
 119
 120                 if (check_idle)
 121                         idle = check_idle(userdata);
 122                 else
 123                         idle = true;
 124
 125                 r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout);
 126                 if (r < 0)
 127                         return r;
 128
 129                 if (r == 0 && !exiting && idle) {
 130
 131                         r = sd_bus_try_close(bus);
 132                         if (r == -EBUSY)
 133                                 continue;
 134
 135                         /* Fallback for dbus1 connections: we
 136                          * unregister the name and wait for the
 137                          * response to come through for it */
 138                         if (r == -EOPNOTSUPP) {
 139
 140                                 /* Inform the service manager that we
 141                                  * are going down, so that it will
 142                                  * queue all further start requests,
 143                                  * instead of assuming we are already
 144                                  * running. */
 145                                 sd_notify(false, "STOPPING=1");
 146
 147                                 r = bus_async_unregister_and_exit(e, bus, name);
 148                                 if (r < 0)
 149                                         return r;
 150
 151                                 exiting = true;
 152                                 continue;
 153                         }
 154
 155                         if (r < 0)
 156                                 return r;
 157
 158                         sd_event_exit(e, 0);
 159                         break;
 160                 }
 161         }
 162
 163         r = sd_event_get_exit_code(e, &code);
 164         if (r < 0)
 165                 return r;
 166
 167         return code;
 168 }
 169 #endif // 0
 170
 171 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
 172         _cleanup_(sd_bus_message_unrefp) sd_bus_message *rep = NULL;
 173         int r, has_owner = 0;
 174
 175         assert(c);
 176         assert(name);
 177
 178         r = sd_bus_call_method(c,
 179                                "org.freedesktop.DBus",
 180                                "/org/freedesktop/dbus",
 181                                "org.freedesktop.DBus",
 182                                "NameHasOwner",
 183                                error,
 184                                &rep,
 185                                "s",
 186                                name);
 187         if (r < 0)
 188                 return r;
 189
 190         r = sd_bus_message_read_basic(rep, 'b', &has_owner);
 191         if (r < 0)
 192                 return sd_bus_error_set_errno(error, r);
 193
 194         return has_owner;
 195 }
 196
 197 static int check_good_user(sd_bus_message *m, uid_t good_user) {
 198         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 199         uid_t sender_uid;
 200         int r;
 201
 202         assert(m);
 203
 204         if (good_user == UID_INVALID)
 205                 return 0;
 206
 207         r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds);
 208         if (r < 0)
 209                 return r;
 210
 211         /* Don't trust augmented credentials for authorization */
 212         assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM);
 213
 214         r = sd_bus_creds_get_euid(creds, &sender_uid);
 215         if (r < 0)
 216                 return r;
 217
 218         return sender_uid == good_user;
 219 }
 220
 221 int bus_test_polkit(
 222                 sd_bus_message *call,
 223                 int capability,
 224                 const char *action,
 225                 const char **details,
 226                 uid_t good_user,
 227                 bool *_challenge,
 228                 sd_bus_error *e) {
 229
 230         int r;
 231
 232         assert(call);
 233         assert(action);
 234
 235         /* Tests non-interactively! */
 236
 237         r = check_good_user(call, good_user);
 238         if (r != 0)
 239                 return r;
 240
 241         r = sd_bus_query_sender_privilege(call, capability);
 242         if (r < 0)
 243                 return r;
 244         else if (r > 0)
 245                 return 1;
 246 #if ENABLE_POLKIT
 247         else {
 248                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *request = NULL;
 249                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 250                 int authorized = false, challenge = false;
 251                 const char *sender, **k, **v;
 252
 253                 sender = sd_bus_message_get_sender(call);
 254                 if (!sender)
 255                         return -EBADMSG;
 256
 257                 r = sd_bus_message_new_method_call(
 258                                 call->bus,
 259                                 &request,
 260                                 "org.freedesktop.PolicyKit1",
 261                                 "/org/freedesktop/PolicyKit1/Authority",
 262                                 "org.freedesktop.PolicyKit1.Authority",
 263                                 "CheckAuthorization");
 264                 if (r < 0)
 265                         return r;
 266
 267                 r = sd_bus_message_append(
 268                                 request,
 269                                 "(sa{sv})s",
 270                                 "system-bus-name", 1, "name", "s", sender,
 271                                 action);
 272                 if (r < 0)
 273                         return r;
 274
 275                 r = sd_bus_message_open_container(request, 'a', "{ss}");
 276                 if (r < 0)
 277                         return r;
 278
 279                 STRV_FOREACH_PAIR(k, v, details) {
 280                         r = sd_bus_message_append(request, "{ss}", *k, *v);
 281                         if (r < 0)
 282                                 return r;
 283                 }
 284
 285                 r = sd_bus_message_close_container(request);
 286                 if (r < 0)
 287                         return r;
 288
 289                 r = sd_bus_message_append(request, "us", 0, NULL);
 290                 if (r < 0)
 291                         return r;
 292
 293                 r = sd_bus_call(call->bus, request, 0, e, &reply);
 294                 if (r < 0) {
 295                         /* Treat no PK available as access denied */
 296                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
 297                                 sd_bus_error_free(e);
 298                                 return -EACCES;
 299                         }
 300
 301                         return r;
 302                 }
 303
 304                 r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
 305                 if (r < 0)
 306                         return r;
 307
 308                 r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
 309                 if (r < 0)
 310                         return r;
 311
 312                 if (authorized)
 313                         return 1;
 314
 315                 if (_challenge) {
 316                         *_challenge = challenge;
 317                         return 0;
 318                 }
 319         }
 320 #endif
 321
 322         return -EACCES;
 323 }
 324
 325 #if ENABLE_POLKIT
 326
 327 typedef struct AsyncPolkitQuery {
 328         sd_bus_message *request, *reply;
 329         sd_bus_message_handler_t callback;
 330         void *userdata;
 331         sd_bus_slot *slot;
 332         Hashmap *registry;
 333 } AsyncPolkitQuery;
 334
 335 static void async_polkit_query_free(AsyncPolkitQuery *q) {
 336
 337         if (!q)
 338                 return;
 339
 340         sd_bus_slot_unref(q->slot);
 341
 342         if (q->registry && q->request)
 343                 hashmap_remove(q->registry, q->request);
 344
 345         sd_bus_message_unref(q->request);
 346         sd_bus_message_unref(q->reply);
 347
 348         free(q);
 349 }
 350
 351 static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
 352         _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
 353         AsyncPolkitQuery *q = userdata;
 354         int r;
 355
 356         assert(reply);
 357         assert(q);
 358
 359         q->slot = sd_bus_slot_unref(q->slot);
 360         q->reply = sd_bus_message_ref(reply);
 361
 362         r = sd_bus_message_rewind(q->request, true);
 363         if (r < 0) {
 364                 r = sd_bus_reply_method_errno(q->request, r, NULL);
 365                 goto finish;
 366         }
 367
 368         r = q->callback(q->request, q->userdata, &error_buffer);
 369         r = bus_maybe_reply_error(q->request, r, &error_buffer);
 370
 371 finish:
 372         async_polkit_query_free(q);
 373
 374         return r;
 375 }
 376
 377 #endif
 378
 379 int bus_verify_polkit_async(
 380                 sd_bus_message *call,
 381                 int capability,
 382                 const char *action,
 383                 const char **details,
 384                 bool interactive,
 385                 uid_t good_user,
 386                 Hashmap **registry,
 387                 sd_bus_error *error) {
 388
 389 #if ENABLE_POLKIT
 390         _cleanup_(sd_bus_message_unrefp) sd_bus_message *pk = NULL;
 391         AsyncPolkitQuery *q;
 392         const char *sender, **k, **v;
 393         sd_bus_message_handler_t callback;
 394         void *userdata;
 395         int c;
 396 #endif
 397         int r;
 398
 399         assert(call);
 400         assert(action);
 401         assert(registry);
 402
 403         r = check_good_user(call, good_user);
 404         if (r != 0)
 405                 return r;
 406
 407 #if ENABLE_POLKIT
 408         q = hashmap_get(*registry, call);
 409         if (q) {
 410                 int authorized, challenge;
 411
 412                 /* This is the second invocation of this function, and
 413                  * there's already a response from polkit, let's
 414                  * process it */
 415                 assert(q->reply);
 416
 417                 if (sd_bus_message_is_method_error(q->reply, NULL)) {
 418                         const sd_bus_error *e;
 419
 420                         /* Copy error from polkit reply */
 421                         e = sd_bus_message_get_error(q->reply);
 422                         sd_bus_error_copy(error, e);
 423
 424                         /* Treat no PK available as access denied */
 425                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
 426                                 return -EACCES;
 427
 428                         return -sd_bus_error_get_errno(e);
 429                 }
 430
 431                 r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
 432                 if (r >= 0)
 433                         r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
 434
 435                 if (r < 0)
 436                         return r;
 437
 438                 if (authorized)
 439                         return 1;
 440
 441                 if (challenge)
 442                         return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required.");
 443
 444                 return -EACCES;
 445         }
 446 #endif
 447
 448         r = sd_bus_query_sender_privilege(call, capability);
 449         if (r < 0)
 450                 return r;
 451         else if (r > 0)
 452                 return 1;
 453
 454 #if ENABLE_POLKIT
 455         if (sd_bus_get_current_message(call->bus) != call)
 456                 return -EINVAL;
 457
 458         callback = sd_bus_get_current_handler(call->bus);
 459         if (!callback)
 460                 return -EINVAL;
 461
 462         userdata = sd_bus_get_current_userdata(call->bus);
 463
 464         sender = sd_bus_message_get_sender(call);
 465         if (!sender)
 466                 return -EBADMSG;
 467
 468         c = sd_bus_message_get_allow_interactive_authorization(call);
 469         if (c < 0)
 470                 return c;
 471         if (c > 0)
 472                 interactive = true;
 473
 474         r = hashmap_ensure_allocated(registry, NULL);
 475         if (r < 0)
 476                 return r;
 477
 478         r = sd_bus_message_new_method_call(
 479                         call->bus,
 480                         &pk,
 481                         "org.freedesktop.PolicyKit1",
 482                         "/org/freedesktop/PolicyKit1/Authority",
 483                         "org.freedesktop.PolicyKit1.Authority",
 484                         "CheckAuthorization");
 485         if (r < 0)
 486                 return r;
 487
 488         r = sd_bus_message_append(
 489                         pk,
 490                         "(sa{sv})s",
 491                         "system-bus-name", 1, "name", "s", sender,
 492                         action);
 493         if (r < 0)
 494                 return r;
 495
 496         r = sd_bus_message_open_container(pk, 'a', "{ss}");
 497         if (r < 0)
 498                 return r;
 499
 500         STRV_FOREACH_PAIR(k, v, details) {
 501                 r = sd_bus_message_append(pk, "{ss}", *k, *v);
 502                 if (r < 0)
 503                         return r;
 504         }
 505
 506         r = sd_bus_message_close_container(pk);
 507         if (r < 0)
 508                 return r;
 509
 510         r = sd_bus_message_append(pk, "us", !!interactive, NULL);
 511         if (r < 0)
 512                 return r;
 513
 514         q = new0(AsyncPolkitQuery, 1);
 515         if (!q)
 516                 return -ENOMEM;
 517
 518         q->request = sd_bus_message_ref(call);
 519         q->callback = callback;
 520         q->userdata = userdata;
 521
 522         r = hashmap_put(*registry, call, q);
 523         if (r < 0) {
 524                 async_polkit_query_free(q);
 525                 return r;
 526         }
 527
 528         q->registry = *registry;
 529
 530         r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0);
 531         if (r < 0) {
 532                 async_polkit_query_free(q);
 533                 return r;
 534         }
 535
 536         return 0;
 537 #endif
 538
 539         return -EACCES;
 540 }
 541
 542 void bus_verify_polkit_async_registry_free(Hashmap *registry) {
 543 #if ENABLE_POLKIT
 544         hashmap_free_with_destructor(registry, async_polkit_query_free);
 545 #endif
 546 }
 547
 548 #if 0 /// UNNEEDED by elogind
 549 int bus_check_peercred(sd_bus *c) {
 550         struct ucred ucred;
 551         int fd, r;
 552
 553         assert(c);
 554
 555         fd = sd_bus_get_fd(c);
 556         if (fd < 0)
 557                 return fd;
 558
 559         r = getpeercred(fd, &ucred);
 560         if (r < 0)
 561                 return r;
 562
 563         if (ucred.uid != 0 && ucred.uid != geteuid())
 564                 return -EPERM;
 565
 566         return 1;
 567 }
 568
 569 int bus_connect_system_systemd(sd_bus **_bus) {
 570         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 571         int r;
 572
 573         assert(_bus);
 574
 575         if (geteuid() != 0)
 576                 return sd_bus_default_system(_bus);
 577
 578         /* If we are root then let's talk directly to the system
 579          * instance, instead of going via the bus */
 580
 581         r = sd_bus_new(&bus);
 582         if (r < 0)
 583                 return r;
 584
 585         r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
 586         if (r < 0)
 587                 return r;
 588
 589         r = sd_bus_start(bus);
 590         if (r < 0)
 591                 return sd_bus_default_system(_bus);
 592
 593         r = bus_check_peercred(bus);
 594         if (r < 0)
 595                 return r;
 596
 597         *_bus = TAKE_PTR(bus);
 598
 599         return 0;
 600 }
 601
 602 int bus_connect_user_systemd(sd_bus **_bus) {
 603         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 604         _cleanup_free_ char *ee = NULL;
 605         const char *e;
 606         int r;
 607
 608         assert(_bus);
 609
 610         e = secure_getenv("XDG_RUNTIME_DIR");
 611         if (!e)
 612                 return sd_bus_default_user(_bus);
 613
 614         ee = bus_address_escape(e);
 615         if (!ee)
 616                 return -ENOMEM;
 617
 618         r = sd_bus_new(&bus);
 619         if (r < 0)
 620                 return r;
 621
 622         bus->address = strjoin("unix:path=", ee, "/systemd/private");
 623         if (!bus->address)
 624                 return -ENOMEM;
 625
 626         r = sd_bus_start(bus);
 627         if (r < 0)
 628                 return sd_bus_default_user(_bus);
 629
 630         r = bus_check_peercred(bus);
 631         if (r < 0)
 632                 return r;
 633
 634         *_bus = TAKE_PTR(bus);
 635
 636         return 0;
 637 }
 638 #endif // 0
 639
 640 #define print_property(name, fmt, ...)                                  \
 641         do {                                                            \
 642                 if (value)                                              \
 643                         printf(fmt "\n", __VA_ARGS__);                  \
 644                 else                                                    \
 645                         printf("%s=" fmt "\n", name, __VA_ARGS__);      \
 646         } while (0)
 647
 648 int bus_print_property(const char *name, sd_bus_message *m, bool value, bool all) {
 649         char type;
 650         const char *contents;
 651         int r;
 652
 653         assert(name);
 654         assert(m);
 655
 656         r = sd_bus_message_peek_type(m, &type, &contents);
 657         if (r < 0)
 658                 return r;
 659
 660         switch (type) {
 661
 662         case SD_BUS_TYPE_STRING: {
 663                 const char *s;
 664
 665                 r = sd_bus_message_read_basic(m, type, &s);
 666                 if (r < 0)
 667                         return r;
 668
 669                 if (all || !isempty(s)) {
 670                         bool good;
 671
 672                         /* This property has a single value, so we need to take
 673                          * care not to print a new line, everything else is OK. */
 674                         good = !strchr(s, '\n');
 675                         print_property(name, "%s", good ? s : "[unprintable]");
 676                 }
 677
 678                 return 1;
 679         }
 680
 681         case SD_BUS_TYPE_BOOLEAN: {
 682                 int b;
 683
 684                 r = sd_bus_message_read_basic(m, type, &b);
 685                 if (r < 0)
 686                         return r;
 687
 688                 print_property(name, "%s", yes_no(b));
 689
 690                 return 1;
 691         }
 692
 693         case SD_BUS_TYPE_UINT64: {
 694                 uint64_t u;
 695
 696                 r = sd_bus_message_read_basic(m, type, &u);
 697                 if (r < 0)
 698                         return r;
 699
 700                 /* Yes, heuristics! But we can change this check
 701                  * should it turn out to not be sufficient */
 702
 703                 if (endswith(name, "Timestamp") || STR_IN_SET(name, "NextElapseUSecRealtime", "LastTriggerUSec")) {
 704                         char timestamp[FORMAT_TIMESTAMP_MAX];
 705                         const char *t;
 706
 707                         t = format_timestamp(timestamp, sizeof(timestamp), u);
 708                         if (t || all)
 709                                 print_property(name, "%s", strempty(t));
 710
 711                 } else if (strstr(name, "USec")) {
 712                         char timespan[FORMAT_TIMESPAN_MAX];
 713
 714                         print_property(name, "%s", format_timespan(timespan, sizeof(timespan), u, 0));
 715                 } else if (streq(name, "RestrictNamespaces")) {
 716                         _cleanup_free_ char *s = NULL;
 717                         const char *result;
 718
 719                         if ((u & NAMESPACE_FLAGS_ALL) == 0)
 720                                 result = "yes";
 721                         else if ((u & NAMESPACE_FLAGS_ALL) == NAMESPACE_FLAGS_ALL)
 722                                 result = "no";
 723                         else {
 724                                 r = namespace_flags_to_string(u, &s);
 725                                 if (r < 0)
 726                                         return r;
 727
 728                                 result = s;
 729                         }
 730
 731                         print_property(name, "%s", result);
 732
 733                 } else if (streq(name, "MountFlags")) {
 734                         const char *result;
 735
 736                         result = mount_propagation_flags_to_string(u);
 737                         if (!result)
 738                                 return -EINVAL;
 739
 740                         print_property(name, "%s", result);
 741
 742                 } else if (STR_IN_SET(name, "CapabilityBoundingSet", "AmbientCapabilities")) {
 743                         _cleanup_free_ char *s = NULL;
 744
 745                         r = capability_set_to_string_alloc(u, &s);
 746                         if (r < 0)
 747                                 return r;
 748
 749                         print_property(name, "%s", s);
 750
 751                 } else if ((STR_IN_SET(name, "CPUWeight", "StartupCPUWeight", "IOWeight", "StartupIOWeight") && u == CGROUP_WEIGHT_INVALID) ||
 752                            (STR_IN_SET(name, "CPUShares", "StartupCPUShares") && u == CGROUP_CPU_SHARES_INVALID) ||
 753                            (STR_IN_SET(name, "BlockIOWeight", "StartupBlockIOWeight") && u == CGROUP_BLKIO_WEIGHT_INVALID) ||
 754                            (STR_IN_SET(name, "MemoryCurrent", "TasksCurrent") && u == (uint64_t) -1) ||
 755                            (endswith(name, "NSec") && u == (uint64_t) -1))
 756
 757                         print_property(name, "%s", "[not set]");
 758
 759                 else if ((STR_IN_SET(name, "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit") && u == CGROUP_LIMIT_MAX) ||
 760                          (STR_IN_SET(name, "TasksMax", "DefaultTasksMax") && u == (uint64_t) -1) ||
 761                          (startswith(name, "Limit") && u == (uint64_t) -1) ||
 762                          (startswith(name, "DefaultLimit") && u == (uint64_t) -1))
 763
 764                         print_property(name, "%s", "infinity");
 765                 else
 766                         print_property(name, "%"PRIu64, u);
 767
 768                 return 1;
 769         }
 770
 771         case SD_BUS_TYPE_INT64: {
 772                 int64_t i;
 773
 774                 r = sd_bus_message_read_basic(m, type, &i);
 775                 if (r < 0)
 776                         return r;
 777
 778                 print_property(name, "%"PRIi64, i);
 779
 780                 return 1;
 781         }
 782
 783         case SD_BUS_TYPE_UINT32: {
 784                 uint32_t u;
 785
 786                 r = sd_bus_message_read_basic(m, type, &u);
 787                 if (r < 0)
 788                         return r;
 789
 790                 if (strstr(name, "UMask") || strstr(name, "Mode"))
 791                         print_property(name, "%04o", u);
 792                 else if (streq(name, "UID")) {
 793                         if (u == UID_INVALID)
 794                                 print_property(name, "%s", "[not set]");
 795                         else
 796                                 print_property(name, "%"PRIu32, u);
 797                 } else if (streq(name, "GID")) {
 798                         if (u == GID_INVALID)
 799                                 print_property(name, "%s", "[not set]");
 800                         else
 801                                 print_property(name, "%"PRIu32, u);
 802                 } else
 803                         print_property(name, "%"PRIu32, u);
 804
 805                 return 1;
 806         }
 807
 808         case SD_BUS_TYPE_INT32: {
 809                 int32_t i;
 810
 811                 r = sd_bus_message_read_basic(m, type, &i);
 812                 if (r < 0)
 813                         return r;
 814
 815                 print_property(name, "%"PRIi32, i);
 816                 return 1;
 817         }
 818
 819         case SD_BUS_TYPE_DOUBLE: {
 820                 double d;
 821
 822                 r = sd_bus_message_read_basic(m, type, &d);
 823                 if (r < 0)
 824                         return r;
 825
 826                 print_property(name, "%g", d);
 827                 return 1;
 828         }
 829
 830         case SD_BUS_TYPE_ARRAY:
 831                 if (streq(contents, "s")) {
 832                         bool first = true;
 833                         const char *str;
 834
 835                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, contents);
 836                         if (r < 0)
 837                                 return r;
 838
 839                         while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &str)) > 0) {
 840                                 bool good;
 841
 842                                 if (first && !value)
 843                                         printf("%s=", name);
 844
 845                                 /* This property has multiple space-separated values, so
 846                                  * neither spaces nor newlines can be allowed in a value. */
 847                                 good = str[strcspn(str, " \n")] == '\0';
 848
 849                                 printf("%s%s", first ? "" : " ", good ? str : "[unprintable]");
 850
 851                                 first = false;
 852                         }
 853                         if (r < 0)
 854                                 return r;
 855
 856                         if (first && all && !value)
 857                                 printf("%s=", name);
 858                         if (!first || all)
 859                                 puts("");
 860
 861                         r = sd_bus_message_exit_container(m);
 862                         if (r < 0)
 863                                 return r;
 864
 865                         return 1;
 866
 867                 } else if (streq(contents, "y")) {
 868                         const uint8_t *u;
 869                         size_t n;
 870
 871                         r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
 872                         if (r < 0)
 873                                 return r;
 874
 875                         if (all || n > 0) {
 876                                 unsigned int i;
 877
 878                                 if (!value)
 879                                         printf("%s=", name);
 880
 881                                 for (i = 0; i < n; i++)
 882                                         printf("%02x", u[i]);
 883
 884                                 puts("");
 885                         }
 886
 887                         return 1;
 888
 889                 } else if (streq(contents, "u")) {
 890                         uint32_t *u;
 891                         size_t n;
 892
 893                         r = sd_bus_message_read_array(m, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
 894                         if (r < 0)
 895                                 return r;
 896
 897                         if (all || n > 0) {
 898                                 unsigned int i;
 899
 900                                 if (!value)
 901                                         printf("%s=", name);
 902
 903                                 for (i = 0; i < n; i++)
 904                                         printf("%08x", u[i]);
 905
 906                                 puts("");
 907                         }
 908
 909                         return 1;
 910                 }
 911
 912                 break;
 913         }
 914
 915         return 0;
 916 }
 917
 918 int bus_message_print_all_properties(
 919                 sd_bus_message *m,
 920                 bus_message_print_t func,
 921                 char **filter,
 922                 bool value,
 923                 bool all,
 924                 Set **found_properties) {
 925
 926         int r;
 927
 928         assert(m);
 929
 930         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
 931         if (r < 0)
 932                 return r;
 933
 934         while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
 935                 const char *name;
 936                 const char *contents;
 937
 938                 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &name);
 939                 if (r < 0)
 940                         return r;
 941
 942                 if (found_properties) {
 943                         r = set_ensure_allocated(found_properties, &string_hash_ops);
 944                         if (r < 0)
 945                                 return log_oom();
 946
 947                         r = set_put(*found_properties, name);
 948                         if (r < 0 && r != EEXIST)
 949                                 return log_oom();
 950                 }
 951
 952                 if (!filter || strv_find(filter, name)) {
 953                         r = sd_bus_message_peek_type(m, NULL, &contents);
 954                         if (r < 0)
 955                                 return r;
 956
 957                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
 958                         if (r < 0)
 959                                 return r;
 960
 961                         if (func)
 962                                 r = func(name, m, value, all);
 963                         if (!func || r == 0)
 964                                 r = bus_print_property(name, m, value, all);
 965                         if (r < 0)
 966                                 return r;
 967                         if (r == 0) {
 968                                 if (all)
 969                                         printf("%s=[unprintable]\n", name);
 970                                 /* skip what we didn't read */
 971                                 r = sd_bus_message_skip(m, contents);
 972                                 if (r < 0)
 973                                         return r;
 974                         }
 975
 976                         r = sd_bus_message_exit_container(m);
 977                         if (r < 0)
 978                                 return r;
 979                 } else {
 980                         r = sd_bus_message_skip(m, "v");
 981                         if (r < 0)
 982                                 return r;
 983                 }
 984
 985                 r = sd_bus_message_exit_container(m);
 986                 if (r < 0)
 987                         return r;
 988         }
 989         if (r < 0)
 990                 return r;
 991
 992         r = sd_bus_message_exit_container(m);
 993         if (r < 0)
 994                 return r;
 995
 996         return 0;
 997 }
 998
 999 int bus_print_all_properties(
1000                 sd_bus *bus,
1001                 const char *dest,
1002                 const char *path,
1003                 bus_message_print_t func,
1004                 char **filter,
1005                 bool value,
1006                 bool all,
1007                 Set **found_properties) {
1008
1009         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1010         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1011         int r;
1012
1013         assert(bus);
1014         assert(path);
1015
1016         r = sd_bus_call_method(bus,
1017                         dest,
1018                         path,
1019                         "org.freedesktop.DBus.Properties",
1020                         "GetAll",
1021                         &error,
1022                         &reply,
1023                         "s", "");
1024         if (r < 0)
1025                 return r;
1026
1027         return bus_message_print_all_properties(reply, func, filter, value, all, found_properties);
1028 }
1029
1030 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1031         sd_id128_t *p = userdata;
1032         const void *v;
1033         size_t n;
1034         int r;
1035
1036         r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
1037         if (r < 0)
1038                 return r;
1039
1040         if (n == 0)
1041                 *p = SD_ID128_NULL;
1042         else if (n == 16)
1043                 memcpy((*p).bytes, v, n);
1044         else
1045                 return -EINVAL;
1046
1047         return 0;
1048 }
1049
1050 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, unsigned flags, sd_bus_error *error, void *userdata) {
1051         char type;
1052         int r;
1053
1054         r = sd_bus_message_peek_type(m, &type, NULL);
1055         if (r < 0)
1056                 return r;
1057
1058         switch (type) {
1059
1060         case SD_BUS_TYPE_STRING: {
1061                 const char **p = userdata;
1062                 const char *s;
1063
1064                 r = sd_bus_message_read_basic(m, type, &s);
1065                 if (r < 0)
1066                         return r;
1067
1068                 if (isempty(s))
1069                         s = NULL;
1070
1071                 if (flags & BUS_MAP_STRDUP)
1072                         return free_and_strdup((char **) userdata, s);
1073
1074                 *p = s;
1075                 return 0;
1076         }
1077
1078         case SD_BUS_TYPE_ARRAY: {
1079                 _cleanup_strv_free_ char **l = NULL;
1080                 char ***p = userdata;
1081
1082                 r = bus_message_read_strv_extend(m, &l);
1083                 if (r < 0)
1084                         return r;
1085
1086                 return strv_free_and_replace(*p, l);
1087         }
1088
1089         case SD_BUS_TYPE_BOOLEAN: {
1090                 int b;
1091
1092                 r = sd_bus_message_read_basic(m, type, &b);
1093                 if (r < 0)
1094                         return r;
1095
1096                 if (flags & BUS_MAP_BOOLEAN_AS_BOOL)
1097                         *(bool*) userdata = b;
1098                 else
1099                         *(int*) userdata = b;
1100
1101                 return 0;
1102         }
1103
1104         case SD_BUS_TYPE_INT32:
1105         case SD_BUS_TYPE_UINT32: {
1106                 uint32_t u, *p = userdata;
1107
1108                 r = sd_bus_message_read_basic(m, type, &u);
1109                 if (r < 0)
1110                         return r;
1111
1112                 *p = u;
1113                 return 0;
1114         }
1115
1116         case SD_BUS_TYPE_INT64:
1117         case SD_BUS_TYPE_UINT64: {
1118                 uint64_t t, *p = userdata;
1119
1120                 r = sd_bus_message_read_basic(m, type, &t);
1121                 if (r < 0)
1122                         return r;
1123
1124                 *p = t;
1125                 return 0;
1126         }
1127
1128         case SD_BUS_TYPE_DOUBLE: {
1129                 double d, *p = userdata;
1130
1131                 r = sd_bus_message_read_basic(m, type, &d);
1132                 if (r < 0)
1133                         return r;
1134
1135                 *p = d;
1136                 return 0;
1137         }}
1138
1139         return -EOPNOTSUPP;
1140 }
1141
1142 int bus_message_map_all_properties(
1143                 sd_bus_message *m,
1144                 const struct bus_properties_map *map,
1145                 unsigned flags,
1146                 sd_bus_error *error,
1147                 void *userdata) {
1148
1149         int r;
1150
1151         assert(m);
1152         assert(map);
1153
1154         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
1155         if (r < 0)
1156                 return r;
1157
1158         while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
1159                 const struct bus_properties_map *prop;
1160                 const char *member;
1161                 const char *contents;
1162                 void *v;
1163                 unsigned i;
1164
1165                 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
1166                 if (r < 0)
1167                         return r;
1168
1169                 for (i = 0, prop = NULL; map[i].member; i++)
1170                         if (streq(map[i].member, member)) {
1171                                 prop = &map[i];
1172                                 break;
1173                         }
1174
1175                 if (prop) {
1176                         r = sd_bus_message_peek_type(m, NULL, &contents);
1177                         if (r < 0)
1178                                 return r;
1179
1180                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
1181                         if (r < 0)
1182                                 return r;
1183
1184                         v = (uint8_t *)userdata + prop->offset;
1185                         if (map[i].set)
1186                                 r = prop->set(sd_bus_message_get_bus(m), member, m, error, v);
1187                         else
1188                                 r = map_basic(sd_bus_message_get_bus(m), member, m, flags, error, v);
1189                         if (r < 0)
1190                                 return r;
1191
1192                         r = sd_bus_message_exit_container(m);
1193                         if (r < 0)
1194                                 return r;
1195                 } else {
1196                         r = sd_bus_message_skip(m, "v");
1197                         if (r < 0)
1198                                 return r;
1199                 }
1200
1201                 r = sd_bus_message_exit_container(m);
1202                 if (r < 0)
1203                         return r;
1204         }
1205         if (r < 0)
1206                 return r;
1207
1208         return sd_bus_message_exit_container(m);
1209 }
1210
1211 #if 0 /// UNNEEDED by elogind
1212 int bus_message_map_properties_changed(
1213                 sd_bus_message *m,
1214                 const struct bus_properties_map *map,
1215                 unsigned flags,
1216                 sd_bus_error *error,
1217                 void *userdata) {
1218
1219         const char *member;
1220         int r, invalidated, i;
1221
1222         assert(m);
1223         assert(map);
1224
1225         r = bus_message_map_all_properties(m, map, flags, error, userdata);
1226         if (r < 0)
1227                 return r;
1228
1229         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
1230         if (r < 0)
1231                 return r;
1232
1233         invalidated = 0;
1234         while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
1235                 for (i = 0; map[i].member; i++)
1236                         if (streq(map[i].member, member)) {
1237                                 ++invalidated;
1238                                 break;
1239                         }
1240         if (r < 0)
1241                 return r;
1242
1243         r = sd_bus_message_exit_container(m);
1244         if (r < 0)
1245                 return r;
1246
1247         return invalidated;
1248 }
1249 #endif // 0
1250
1251 int bus_map_all_properties(
1252                 sd_bus *bus,
1253                 const char *destination,
1254                 const char *path,
1255                 const struct bus_properties_map *map,
1256                 unsigned flags,
1257                 sd_bus_error *error,
1258                 sd_bus_message **reply,
1259                 void *userdata) {
1260
1261         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1262         int r;
1263
1264         assert(bus);
1265         assert(destination);
1266         assert(path);
1267         assert(map);
1268         assert(reply || (flags & BUS_MAP_STRDUP));
1269
1270         r = sd_bus_call_method(
1271                         bus,
1272                         destination,
1273                         path,
1274                         "org.freedesktop.DBus.Properties",
1275                         "GetAll",
1276                         error,
1277                         &m,
1278                         "s", "");
1279         if (r < 0)
1280                 return r;
1281
1282         r = bus_message_map_all_properties(m, map, flags, error, userdata);
1283         if (r < 0)
1284                 return r;
1285
1286         if (reply)
1287                 *reply = sd_bus_message_ref(m);
1288
1289         return r;
1290 }
1291
1292 int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **ret) {
1293         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
1294         int r;
1295
1296         assert(transport >= 0);
1297         assert(transport < _BUS_TRANSPORT_MAX);
1298         assert(ret);
1299
1300         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1301         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1302
1303         switch (transport) {
1304
1305         case BUS_TRANSPORT_LOCAL:
1306 #if 0 /// elogind does not support a user bus
1307                 if (user)
1308                         r = sd_bus_default_user(&bus);
1309 #endif // 0
1310                 else {
1311                         if (sd_booted() <= 0) {
1312                                 /* Print a friendly message when the local system is actually not running systemd as PID 1. */
1313                                 log_error("System has not been booted with elogind as init system (PID 1). Can't operate.");
1314
1315                                 return -EHOSTDOWN;
1316                         }
1317                         r = sd_bus_default_system(&bus);
1318                 }
1319                 break;
1320
1321         case BUS_TRANSPORT_REMOTE:
1322                 r = sd_bus_open_system_remote(&bus, host);
1323                 break;
1324
1325         case BUS_TRANSPORT_MACHINE:
1326                 r = sd_bus_open_system_machine(&bus, host);
1327                 break;
1328
1329         default:
1330                 assert_not_reached("Hmm, unknown transport type.");
1331         }
1332         if (r < 0)
1333                 return r;
1334
1335         r = sd_bus_set_exit_on_disconnect(bus, true);
1336         if (r < 0)
1337                 return r;
1338
1339         *ret = TAKE_PTR(bus);
1340
1341         return 0;
1342 }
1343
1344 #if 0 /// UNNEEDED by elogind
1345 int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1346         int r;
1347
1348         assert(transport >= 0);
1349         assert(transport < _BUS_TRANSPORT_MAX);
1350         assert(bus);
1351
1352         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1353         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1354
1355         switch (transport) {
1356
1357         case BUS_TRANSPORT_LOCAL:
1358                 if (user)
1359                         r = bus_connect_user_systemd(bus);
1360                 else {
1361                         if (sd_booted() <= 0) {
1362                                 /* Print a friendly message when the local system is actually not running systemd as PID 1. */
1363                                 log_error("System has not been booted with systemd as init system (PID 1). Can't operate.");
1364
1365                                 return -EHOSTDOWN;
1366                         }
1367                         r = bus_connect_system_systemd(bus);
1368                 }
1369                 break;
1370
1371         case BUS_TRANSPORT_REMOTE:
1372                 r = sd_bus_open_system_remote(bus, host);
1373                 break;
1374
1375         case BUS_TRANSPORT_MACHINE:
1376                 r = sd_bus_open_system_machine(bus, host);
1377                 break;
1378
1379         default:
1380                 assert_not_reached("Hmm, unknown transport type.");
1381         }
1382
1383         return r;
1384 }
1385 #endif // 0
1386
1387 int bus_property_get_bool(
1388                 sd_bus *bus,
1389                 const char *path,
1390                 const char *interface,
1391                 const char *property,
1392                 sd_bus_message *reply,
1393                 void *userdata,
1394                 sd_bus_error *error) {
1395
1396         int b = *(bool*) userdata;
1397
1398         return sd_bus_message_append_basic(reply, 'b', &b);
1399 }
1400
1401 int bus_property_set_bool(
1402                 sd_bus *bus,
1403                 const char *path,
1404                 const char *interface,
1405                 const char *property,
1406                 sd_bus_message *value,
1407                 void *userdata,
1408                 sd_bus_error *error) {
1409
1410         int b, r;
1411
1412         r = sd_bus_message_read(value, "b", &b);
1413         if (r < 0)
1414                 return r;
1415
1416         *(bool*) userdata = b;
1417         return 0;
1418 }
1419
1420 #if 0 /// UNNEEDED by elogind
1421 int bus_property_get_id128(
1422                 sd_bus *bus,
1423                 const char *path,
1424                 const char *interface,
1425                 const char *property,
1426                 sd_bus_message *reply,
1427                 void *userdata,
1428                 sd_bus_error *error) {
1429
1430         sd_id128_t *id = userdata;
1431
1432         if (sd_id128_is_null(*id)) /* Add an empty array if the ID is zero */
1433                 return sd_bus_message_append(reply, "ay", 0);
1434         else
1435                 return sd_bus_message_append_array(reply, 'y', id->bytes, 16);
1436 }
1437 #endif // 0
1438
1439 #if __SIZEOF_SIZE_T__ != 8
1440 int bus_property_get_size(
1441                 sd_bus *bus,
1442                 const char *path,
1443                 const char *interface,
1444                 const char *property,
1445                 sd_bus_message *reply,
1446                 void *userdata,
1447                 sd_bus_error *error) {
1448
1449         uint64_t sz = *(size_t*) userdata;
1450
1451         return sd_bus_message_append_basic(reply, 't', &sz);
1452 }
1453 #endif
1454
1455 #if __SIZEOF_LONG__ != 8
1456 int bus_property_get_long(
1457                 sd_bus *bus,
1458                 const char *path,
1459                 const char *interface,
1460                 const char *property,
1461                 sd_bus_message *reply,
1462                 void *userdata,
1463                 sd_bus_error *error) {
1464
1465         int64_t l = *(long*) userdata;
1466
1467         return sd_bus_message_append_basic(reply, 'x', &l);
1468 }
1469
1470 int bus_property_get_ulong(
1471                 sd_bus *bus,
1472                 const char *path,
1473                 const char *interface,
1474                 const char *property,
1475                 sd_bus_message *reply,
1476                 void *userdata,
1477                 sd_bus_error *error) {
1478
1479         uint64_t ul = *(unsigned long*) userdata;
1480
1481         return sd_bus_message_append_basic(reply, 't', &ul);
1482 }
1483 #endif
1484
1485 int bus_log_parse_error(int r) {
1486         return log_error_errno(r, "Failed to parse bus message: %m");
1487 }
1488
1489 #if 0 /// UNNEEDED by elogind
1490 int bus_log_create_error(int r) {
1491         return log_error_errno(r, "Failed to create bus message: %m");
1492 }
1493
1494 #endif // 0
1495 #if 0 /// UNNEEDED by elogind
1496 /**
1497  * bus_path_encode_unique() - encode unique object path
1498  * @b: bus connection or NULL
1499  * @prefix: object path prefix
1500  * @sender_id: unique-name of client, or NULL
1501  * @external_id: external ID to be chosen by client, or NULL
1502  * @ret_path: storage for encoded object path pointer
1503  *
1504  * Whenever we provide a bus API that allows clients to create and manage
1505  * server-side objects, we need to provide a unique name for these objects. If
1506  * we let the server choose the name, we suffer from a race condition: If a
1507  * client creates an object asynchronously, it cannot destroy that object until
1508  * it received the method reply. It cannot know the name of the new object,
1509  * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
1510  *
1511  * Therefore, many APIs allow the client to choose the unique name for newly
1512  * created objects. There're two problems to solve, though:
1513  *    1) Object names are usually defined via dbus object paths, which are
1514  *       usually globally namespaced. Therefore, multiple clients must be able
1515  *       to choose unique object names without interference.
1516  *    2) If multiple libraries share the same bus connection, they must be
1517  *       able to choose unique object names without interference.
1518  * The first problem is solved easily by prefixing a name with the
1519  * unique-bus-name of a connection. The server side must enforce this and
1520  * reject any other name. The second problem is solved by providing unique
1521  * suffixes from within sd-bus.
1522  *
1523  * This helper allows clients to create unique object-paths. It uses the
1524  * template '/prefix/sender_id/external_id' and returns the new path in
1525  * @ret_path (must be freed by the caller).
1526  * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
1527  * NULL, this function allocates a unique suffix via @b (by requesting a new
1528  * cookie). If both @sender_id and @external_id are given, @b can be passed as
1529  * NULL.
1530  *
1531  * Returns: 0 on success, negative error code on failure.
1532  */
1533 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
1534         _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
1535         char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
1536         int r;
1537
1538         assert_return(b || (sender_id && external_id), -EINVAL);
1539         assert_return(object_path_is_valid(prefix), -EINVAL);
1540         assert_return(ret_path, -EINVAL);
1541
1542         if (!sender_id) {
1543                 r = sd_bus_get_unique_name(b, &sender_id);
1544                 if (r < 0)
1545                         return r;
1546         }
1547
1548         if (!external_id) {
1549                 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
1550                 external_id = external_buf;
1551         }
1552
1553         sender_label = bus_label_escape(sender_id);
1554         if (!sender_label)
1555                 return -ENOMEM;
1556
1557         external_label = bus_label_escape(external_id);
1558         if (!external_label)
1559                 return -ENOMEM;
1560
1561         p = strjoin(prefix, "/", sender_label, "/", external_label);
1562         if (!p)
1563                 return -ENOMEM;
1564
1565         *ret_path = p;
1566         return 0;
1567 }
1568
1569 /**
1570  * bus_path_decode_unique() - decode unique object path
1571  * @path: object path to decode
1572  * @prefix: object path prefix
1573  * @ret_sender: output parameter for sender-id label
1574  * @ret_external: output parameter for external-id label
1575  *
1576  * This does the reverse of bus_path_encode_unique() (see its description for
1577  * details). Both trailing labels, sender-id and external-id, are unescaped and
1578  * returned in the given output parameters (the caller must free them).
1579  *
1580  * Note that this function returns 0 if the path does not match the template
1581  * (see bus_path_encode_unique()), 1 if it matched.
1582  *
1583  * Returns: Negative error code on failure, 0 if the given object path does not
1584  *          match the template (return parameters are set to NULL), 1 if it was
1585  *          parsed successfully (return parameters contain allocated labels).
1586  */
1587 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
1588         const char *p, *q;
1589         char *sender, *external;
1590
1591         assert(object_path_is_valid(path));
1592         assert(object_path_is_valid(prefix));
1593         assert(ret_sender);
1594         assert(ret_external);
1595
1596         p = object_path_startswith(path, prefix);
1597         if (!p) {
1598                 *ret_sender = NULL;
1599                 *ret_external = NULL;
1600                 return 0;
1601         }
1602
1603         q = strchr(p, '/');
1604         if (!q) {
1605                 *ret_sender = NULL;
1606                 *ret_external = NULL;
1607                 return 0;
1608         }
1609
1610         sender = bus_label_unescape_n(p, q - p);
1611         external = bus_label_unescape(q + 1);
1612         if (!sender || !external) {
1613                 free(sender);
1614                 free(external);
1615                 return -ENOMEM;
1616         }
1617
1618         *ret_sender = sender;
1619         *ret_external = external;
1620         return 1;
1621 }
1622 #endif // 0
1623
1624 #if 0 /// UNNEEDED by elogind
1625 int bus_property_get_rlimit(
1626                 sd_bus *bus,
1627                 const char *path,
1628                 const char *interface,
1629                 const char *property,
1630                 sd_bus_message *reply,
1631                 void *userdata,
1632                 sd_bus_error *error) {
1633
1634         const char *is_soft;
1635         struct rlimit *rl;
1636         uint64_t u;
1637         rlim_t x;
1638
1639         assert(bus);
1640         assert(reply);
1641         assert(userdata);
1642
1643         is_soft = endswith(property, "Soft");
1644
1645         rl = *(struct rlimit**) userdata;
1646         if (rl)
1647                 x = is_soft ? rl->rlim_cur : rl->rlim_max;
1648         else {
1649                 struct rlimit buf = {};
1650                 const char *s, *p;
1651                 int z;
1652
1653                 /* Chop off "Soft" suffix */
1654                 s = is_soft ? strndupa(property, is_soft - property) : property;
1655
1656                 /* Skip over any prefix, such as "Default" */
1657                 assert_se(p = strstr(s, "Limit"));
1658
1659                 z = rlimit_from_string(p + 5);
1660                 assert(z >= 0);
1661
1662                 (void) getrlimit(z, &buf);
1663                 x = is_soft ? buf.rlim_cur : buf.rlim_max;
1664         }
1665
1666         /* rlim_t might have different sizes, let's map RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on all
1667          * archs */
1668         u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
1669
1670         return sd_bus_message_append(reply, "t", u);
1671 }
1672
1673 int bus_track_add_name_many(sd_bus_track *t, char **l) {
1674         int r = 0;
1675         char **i;
1676
1677         assert(t);
1678
1679         /* Continues adding after failure, and returns the first failure. */
1680
1681         STRV_FOREACH(i, l) {
1682                 int k;
1683
1684                 k = sd_bus_track_add_name(t, *i);
1685                 if (k < 0 && r >= 0)
1686                         r = k;
1687         }
1688
1689         return r;
1690 }
1691 #endif // 0
1692
1693 int bus_open_system_watch_bind_with_description(sd_bus **ret, const char *description) {
1694         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
1695         const char *e;
1696         int r;
1697
1698         assert(ret);
1699
1700         /* Match like sd_bus_open_system(), but with the "watch_bind" feature and the Connected() signal turned on. */
1701
1702         r = sd_bus_new(&bus);
1703         if (r < 0)
1704                 return r;
1705
1706         if (description) {
1707                 r = sd_bus_set_description(bus, description);
1708                 if (r < 0)
1709                         return r;
1710         }
1711
1712         e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS");
1713         if (!e)
1714                 e = DEFAULT_SYSTEM_BUS_ADDRESS;
1715
1716         r = sd_bus_set_address(bus, e);
1717         if (r < 0)
1718                 return r;
1719
1720         r = sd_bus_set_bus_client(bus, true);
1721         if (r < 0)
1722                 return r;
1723
1724         r = sd_bus_set_trusted(bus, true);
1725         if (r < 0)
1726                 return r;
1727
1728         r = sd_bus_negotiate_creds(bus, true, SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS);
1729         if (r < 0)
1730                 return r;
1731
1732         r = sd_bus_set_watch_bind(bus, true);
1733         if (r < 0)
1734                 return r;
1735
1736         r = sd_bus_set_connected_signal(bus, true);
1737         if (r < 0)
1738                 return r;
1739
1740         r = sd_bus_start(bus);
1741         if (r < 0)
1742                 return r;
1743
1744         *ret = TAKE_PTR(bus);
1745
1746         return 0;
1747 }
1748
1749 struct request_name_data {
1750         unsigned n_ref;
1751
1752         const char *name;
1753         uint64_t flags;
1754         void *userdata;
1755 };
1756
1757 static void request_name_destroy_callback(void *userdata) {
1758         struct request_name_data *data = userdata;
1759
1760         assert(data);
1761         assert(data->n_ref > 0);
1762
1763         log_info("%s n_ref=%u", __func__, data->n_ref);
1764
1765         data->n_ref--;
1766         if (data->n_ref == 0)
1767                 free(data);
1768 }
1769
1770 static int reload_dbus_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1771         struct request_name_data *data = userdata;
1772         const sd_bus_error *e;
1773         int r;
1774
1775         assert(data);
1776         assert(data->name);
1777         assert(data->n_ref > 0);
1778
1779         e = sd_bus_message_get_error(m);
1780         if (e) {
1781                 log_error_errno(sd_bus_error_get_errno(e), "Failed to reload DBus configuration: %s", e->message);
1782                 return 1;
1783         }
1784
1785         /* Here, use the default request name handler to avoid an infinite loop of reloading and requesting. */
1786         r = sd_bus_request_name_async(sd_bus_message_get_bus(m), NULL, data->name, data->flags, NULL, data->userdata);
1787         if (r < 0)
1788                 log_error_errno(r, "Failed to request name: %m");
1789
1790         return 1;
1791 }
1792
1793 static int request_name_handler_may_reload_dbus(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
1794         struct request_name_data *data = userdata;
1795         uint32_t ret;
1796         int r;
1797
1798         assert(m);
1799         assert(data);
1800
1801         if (sd_bus_message_is_method_error(m, NULL)) {
1802                 const sd_bus_error *e = sd_bus_message_get_error(m);
1803                 _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *slot = NULL;
1804
1805                 if (!sd_bus_error_has_name(e, SD_BUS_ERROR_ACCESS_DENIED)) {
1806                         log_debug_errno(sd_bus_error_get_errno(e),
1807                                         "Unable to request name, failing connection: %s",
1808                                         e->message);
1809
1810                         bus_enter_closing(sd_bus_message_get_bus(m));
1811                         return 1;
1812                 }
1813
1814                 log_debug_errno(sd_bus_error_get_errno(e),
1815                                 "Unable to request name, will retry after reloading DBus configuration: %s",
1816                                 e->message);
1817
1818                 /* If systemd-timesyncd.service enables DynamicUser= and dbus.service
1819                  * started before the dynamic user is realized, then the DBus policy
1820                  * about timesyncd has not been enabled yet. So, let's try to reload
1821                  * DBus configuration, and after that request the name again. Note that it
1822                  * seems that no privileges are necessary to call the following method. */
1823
1824                 r = sd_bus_call_method_async(
1825                                 sd_bus_message_get_bus(m),
1826                                 &slot,
1827                                 "org.freedesktop.DBus",
1828                                 "/org/freedesktop/DBus",
1829                                 "org.freedesktop.DBus",
1830                                 "ReloadConfig",
1831                                 reload_dbus_handler,
1832                                 data, NULL);
1833                 if (r < 0) {
1834                         log_error_errno(r, "Failed to reload DBus configuration: %m");
1835                         bus_enter_closing(sd_bus_message_get_bus(m));
1836                         return 1;
1837                 }
1838
1839                 data->n_ref ++;
1840                 assert_se(sd_bus_slot_set_destroy_callback(slot, request_name_destroy_callback) >= 0);
1841
1842                 r = sd_bus_slot_set_floating(slot, true);
1843                 if (r < 0)
1844                         return r;
1845
1846                 return 1;
1847         }
1848
1849         r = sd_bus_message_read(m, "u", &ret);
1850         if (r < 0)
1851                 return r;
1852
1853         switch (ret) {
1854
1855         case BUS_NAME_ALREADY_OWNER:
1856                 log_debug("Already owner of requested service name, ignoring.");
1857                 return 1;
1858
1859         case BUS_NAME_IN_QUEUE:
1860                 log_debug("In queue for requested service name.");
1861                 return 1;
1862
1863         case BUS_NAME_PRIMARY_OWNER:
1864                 log_debug("Successfully acquired requested service name.");
1865                 return 1;
1866
1867         case BUS_NAME_EXISTS:
1868                 log_debug("Requested service name already owned, failing connection.");
1869                 bus_enter_closing(sd_bus_message_get_bus(m));
1870                 return 1;
1871         }
1872
1873         log_debug("Unexpected response from RequestName(), failing connection.");
1874         bus_enter_closing(sd_bus_message_get_bus(m));
1875         return 1;
1876 }
1877
1878 int bus_request_name_async_may_reload_dbus(sd_bus *bus, sd_bus_slot **ret_slot, const char *name, uint64_t flags, void *userdata) {
1879         _cleanup_free_ struct request_name_data *data = NULL;
1880         _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *slot = NULL;
1881         int r;
1882
1883         data = new(struct request_name_data, 1);
1884         if (!data)
1885                 return -ENOMEM;
1886
1887         *data = (struct request_name_data) {
1888                 .n_ref = 1,
1889                 .name = name,
1890                 .flags = flags,
1891                 .userdata = userdata,
1892         };
1893
1894         r = sd_bus_request_name_async(bus, &slot, name, flags, request_name_handler_may_reload_dbus, data);
1895         if (r < 0)
1896                 return r;
1897
1898         assert_se(sd_bus_slot_set_destroy_callback(slot, request_name_destroy_callback) >= 0);
1899         TAKE_PTR(data);
1900
1901         if (ret_slot)
1902                 *ret_slot = TAKE_PTR(slot);
1903         else {
1904                 r = sd_bus_slot_set_floating(slot, true);
1905                 if (r < 0)
1906                         return r;
1907         }
1908
1909         return 0;
1910 }
1911
1912 int bus_reply_pair_array(sd_bus_message *m, char **l) {
1913         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1914         char **k, **v;
1915         int r;
1916
1917         assert(m);
1918
1919         /* Reply to the specified message with a message containing a dictionary put together from the specified
1920          * strv */
1921
1922         r = sd_bus_message_new_method_return(m, &reply);
1923         if (r < 0)
1924                 return r;
1925
1926         r = sd_bus_message_open_container(reply, 'a', "{ss}");
1927         if (r < 0)
1928                 return r;
1929
1930         STRV_FOREACH_PAIR(k, v, l) {
1931                 r = sd_bus_message_append(reply, "{ss}", *k, *v);
1932                 if (r < 0)
1933                         return r;
1934         }
1935
1936         r = sd_bus_message_close_container(reply);
1937         if (r < 0)
1938                 return r;
1939
1940         return sd_bus_send(NULL, reply, NULL);
1941 }