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 "cap-list.h"
  43 #include "cgroup-util.h"
  44 #include "def.h"
  45 #include "escape.h"
  46 #include "fd-util.h"
  47 #include "missing.h"
  48 #include "mount-util.h"
  49 #include "nsflags.h"
  50 #include "parse-util.h"
  51 #include "proc-cmdline.h"
  52 #include "rlimit-util.h"
  53 #include "stdio-util.h"
  54 #include "strv.h"
  55 #include "user-util.h"
  56
  57 static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
  58         sd_event *e = userdata;
  59
  60         assert(m);
  61         assert(e);
  62
  63         sd_bus_close(sd_bus_message_get_bus(m));
  64         sd_event_exit(e, 0);
  65
  66         return 1;
  67 }
  68
  69 int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) {
  70         _cleanup_free_ char *match = NULL;
  71         const char *unique;
  72         int r;
  73
  74         assert(e);
  75         assert(bus);
  76         assert(name);
  77
  78         /* We unregister the name here and then wait for the
  79          * NameOwnerChanged signal for this event to arrive before we
  80          * quit. We do this in order to make sure that any queued
  81          * requests are still processed before we really exit. */
  82
  83         r = sd_bus_get_unique_name(bus, &unique);
  84         if (r < 0)
  85                 return r;
  86
  87         r = asprintf(&match,
  88                      "sender='org.freedesktop.DBus',"
  89                      "type='signal',"
  90                      "interface='org.freedesktop.DBus',"
  91                      "member='NameOwnerChanged',"
  92                      "path='/org/freedesktop/DBus',"
  93                      "arg0='%s',"
  94                      "arg1='%s',"
  95                      "arg2=''", name, unique);
  96         if (r < 0)
  97                 return -ENOMEM;
  98
  99         r = sd_bus_add_match(bus, NULL, match, name_owner_change_callback, e);
 100         if (r < 0)
 101                 return r;
 102
 103         r = sd_bus_release_name(bus, name);
 104         if (r < 0)
 105                 return r;
 106
 107         return 0;
 108 }
 109
 110 int bus_event_loop_with_idle(
 111                 sd_event *e,
 112                 sd_bus *bus,
 113                 const char *name,
 114                 usec_t timeout,
 115                 check_idle_t check_idle,
 116                 void *userdata) {
 117         bool exiting = false;
 118         int r, code;
 119
 120         assert(e);
 121         assert(bus);
 122         assert(name);
 123
 124         for (;;) {
 125                 bool idle;
 126
 127                 r = sd_event_get_state(e);
 128                 if (r < 0)
 129                         return r;
 130                 if (r == SD_EVENT_FINISHED)
 131                         break;
 132
 133                 if (check_idle)
 134                         idle = check_idle(userdata);
 135                 else
 136                         idle = true;
 137
 138                 r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout);
 139                 if (r < 0)
 140                         return r;
 141
 142                 if (r == 0 && !exiting && idle) {
 143
 144                         r = sd_bus_try_close(bus);
 145                         if (r == -EBUSY)
 146                                 continue;
 147
 148                         /* Fallback for dbus1 connections: we
 149                          * unregister the name and wait for the
 150                          * response to come through for it */
 151                         if (r == -EOPNOTSUPP) {
 152
 153                                 /* Inform the service manager that we
 154                                  * are going down, so that it will
 155                                  * queue all further start requests,
 156                                  * instead of assuming we are already
 157                                  * running. */
 158                                 sd_notify(false, "STOPPING=1");
 159
 160                                 r = bus_async_unregister_and_exit(e, bus, name);
 161                                 if (r < 0)
 162                                         return r;
 163
 164                                 exiting = true;
 165                                 continue;
 166                         }
 167
 168                         if (r < 0)
 169                                 return r;
 170
 171                         sd_event_exit(e, 0);
 172                         break;
 173                 }
 174         }
 175
 176         r = sd_event_get_exit_code(e, &code);
 177         if (r < 0)
 178                 return r;
 179
 180         return code;
 181 }
 182
 183 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
 184         _cleanup_(sd_bus_message_unrefp) sd_bus_message *rep = NULL;
 185         int r, has_owner = 0;
 186
 187         assert(c);
 188         assert(name);
 189
 190         r = sd_bus_call_method(c,
 191                                "org.freedesktop.DBus",
 192                                "/org/freedesktop/dbus",
 193                                "org.freedesktop.DBus",
 194                                "NameHasOwner",
 195                                error,
 196                                &rep,
 197                                "s",
 198                                name);
 199         if (r < 0)
 200                 return r;
 201
 202         r = sd_bus_message_read_basic(rep, 'b', &has_owner);
 203         if (r < 0)
 204                 return sd_bus_error_set_errno(error, r);
 205
 206         return has_owner;
 207 }
 208
 209 static int check_good_user(sd_bus_message *m, uid_t good_user) {
 210         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 211         uid_t sender_uid;
 212         int r;
 213
 214         assert(m);
 215
 216         if (good_user == UID_INVALID)
 217                 return 0;
 218
 219         r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds);
 220         if (r < 0)
 221                 return r;
 222
 223         /* Don't trust augmented credentials for authorization */
 224         assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM);
 225
 226         r = sd_bus_creds_get_euid(creds, &sender_uid);
 227         if (r < 0)
 228                 return r;
 229
 230         return sender_uid == good_user;
 231 }
 232
 233 int bus_test_polkit(
 234                 sd_bus_message *call,
 235                 int capability,
 236                 const char *action,
 237                 const char **details,
 238                 uid_t good_user,
 239                 bool *_challenge,
 240                 sd_bus_error *e) {
 241
 242         int r;
 243
 244         assert(call);
 245         assert(action);
 246
 247         /* Tests non-interactively! */
 248
 249         r = check_good_user(call, good_user);
 250         if (r != 0)
 251                 return r;
 252
 253         r = sd_bus_query_sender_privilege(call, capability);
 254         if (r < 0)
 255                 return r;
 256         else if (r > 0)
 257                 return 1;
 258 #ifdef ENABLE_POLKIT
 259         else {
 260                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *request = NULL;
 261                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 262                 int authorized = false, challenge = false;
 263                 const char *sender, **k, **v;
 264
 265                 sender = sd_bus_message_get_sender(call);
 266                 if (!sender)
 267                         return -EBADMSG;
 268
 269                 r = sd_bus_message_new_method_call(
 270                                 call->bus,
 271                                 &request,
 272                                 "org.freedesktop.PolicyKit1",
 273                                 "/org/freedesktop/PolicyKit1/Authority",
 274                                 "org.freedesktop.PolicyKit1.Authority",
 275                                 "CheckAuthorization");
 276                 if (r < 0)
 277                         return r;
 278
 279                 r = sd_bus_message_append(
 280                                 request,
 281                                 "(sa{sv})s",
 282                                 "system-bus-name", 1, "name", "s", sender,
 283                                 action);
 284                 if (r < 0)
 285                         return r;
 286
 287                 r = sd_bus_message_open_container(request, 'a', "{ss}");
 288                 if (r < 0)
 289                         return r;
 290
 291                 STRV_FOREACH_PAIR(k, v, details) {
 292                         r = sd_bus_message_append(request, "{ss}", *k, *v);
 293                         if (r < 0)
 294                                 return r;
 295                 }
 296
 297                 r = sd_bus_message_close_container(request);
 298                 if (r < 0)
 299                         return r;
 300
 301                 r = sd_bus_message_append(request, "us", 0, NULL);
 302                 if (r < 0)
 303                         return r;
 304
 305                 r = sd_bus_call(call->bus, request, 0, e, &reply);
 306                 if (r < 0) {
 307                         /* Treat no PK available as access denied */
 308                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
 309                                 sd_bus_error_free(e);
 310                                 return -EACCES;
 311                         }
 312
 313                         return r;
 314                 }
 315
 316                 r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
 317                 if (r < 0)
 318                         return r;
 319
 320                 r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
 321                 if (r < 0)
 322                         return r;
 323
 324                 if (authorized)
 325                         return 1;
 326
 327                 if (_challenge) {
 328                         *_challenge = challenge;
 329                         return 0;
 330                 }
 331         }
 332 #endif
 333
 334         return -EACCES;
 335 }
 336
 337 #ifdef ENABLE_POLKIT
 338
 339 typedef struct AsyncPolkitQuery {
 340         sd_bus_message *request, *reply;
 341         sd_bus_message_handler_t callback;
 342         void *userdata;
 343         sd_bus_slot *slot;
 344         Hashmap *registry;
 345 } AsyncPolkitQuery;
 346
 347 static void async_polkit_query_free(AsyncPolkitQuery *q) {
 348
 349         if (!q)
 350                 return;
 351
 352         sd_bus_slot_unref(q->slot);
 353
 354         if (q->registry && q->request)
 355                 hashmap_remove(q->registry, q->request);
 356
 357         sd_bus_message_unref(q->request);
 358         sd_bus_message_unref(q->reply);
 359
 360         free(q);
 361 }
 362
 363 static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
 364         _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
 365         AsyncPolkitQuery *q = userdata;
 366         int r;
 367
 368         assert(reply);
 369         assert(q);
 370
 371         q->slot = sd_bus_slot_unref(q->slot);
 372         q->reply = sd_bus_message_ref(reply);
 373
 374         r = sd_bus_message_rewind(q->request, true);
 375         if (r < 0) {
 376                 r = sd_bus_reply_method_errno(q->request, r, NULL);
 377                 goto finish;
 378         }
 379
 380         r = q->callback(q->request, q->userdata, &error_buffer);
 381         r = bus_maybe_reply_error(q->request, r, &error_buffer);
 382
 383 finish:
 384         async_polkit_query_free(q);
 385
 386         return r;
 387 }
 388
 389 #endif
 390
 391 int bus_verify_polkit_async(
 392                 sd_bus_message *call,
 393                 int capability,
 394                 const char *action,
 395                 const char **details,
 396                 bool interactive,
 397                 uid_t good_user,
 398                 Hashmap **registry,
 399                 sd_bus_error *error) {
 400
 401 #ifdef ENABLE_POLKIT
 402         _cleanup_(sd_bus_message_unrefp) sd_bus_message *pk = NULL;
 403         AsyncPolkitQuery *q;
 404         const char *sender, **k, **v;
 405         sd_bus_message_handler_t callback;
 406         void *userdata;
 407         int c;
 408 #endif
 409         int r;
 410
 411         assert(call);
 412         assert(action);
 413         assert(registry);
 414
 415         r = check_good_user(call, good_user);
 416         if (r != 0)
 417                 return r;
 418
 419 #ifdef ENABLE_POLKIT
 420         q = hashmap_get(*registry, call);
 421         if (q) {
 422                 int authorized, challenge;
 423
 424                 /* This is the second invocation of this function, and
 425                  * there's already a response from polkit, let's
 426                  * process it */
 427                 assert(q->reply);
 428
 429                 if (sd_bus_message_is_method_error(q->reply, NULL)) {
 430                         const sd_bus_error *e;
 431
 432                         /* Copy error from polkit reply */
 433                         e = sd_bus_message_get_error(q->reply);
 434                         sd_bus_error_copy(error, e);
 435
 436                         /* Treat no PK available as access denied */
 437                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
 438                                 return -EACCES;
 439
 440                         return -sd_bus_error_get_errno(e);
 441                 }
 442
 443                 r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
 444                 if (r >= 0)
 445                         r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
 446
 447                 if (r < 0)
 448                         return r;
 449
 450                 if (authorized)
 451                         return 1;
 452
 453                 if (challenge)
 454                         return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required.");
 455
 456                 return -EACCES;
 457         }
 458 #endif
 459
 460         r = sd_bus_query_sender_privilege(call, capability);
 461         if (r < 0)
 462                 return r;
 463         else if (r > 0)
 464                 return 1;
 465
 466 #ifdef ENABLE_POLKIT
 467         if (sd_bus_get_current_message(call->bus) != call)
 468                 return -EINVAL;
 469
 470         callback = sd_bus_get_current_handler(call->bus);
 471         if (!callback)
 472                 return -EINVAL;
 473
 474         userdata = sd_bus_get_current_userdata(call->bus);
 475
 476         sender = sd_bus_message_get_sender(call);
 477         if (!sender)
 478                 return -EBADMSG;
 479
 480         c = sd_bus_message_get_allow_interactive_authorization(call);
 481         if (c < 0)
 482                 return c;
 483         if (c > 0)
 484                 interactive = true;
 485
 486         r = hashmap_ensure_allocated(registry, NULL);
 487         if (r < 0)
 488                 return r;
 489
 490         r = sd_bus_message_new_method_call(
 491                         call->bus,
 492                         &pk,
 493                         "org.freedesktop.PolicyKit1",
 494                         "/org/freedesktop/PolicyKit1/Authority",
 495                         "org.freedesktop.PolicyKit1.Authority",
 496                         "CheckAuthorization");
 497         if (r < 0)
 498                 return r;
 499
 500         r = sd_bus_message_append(
 501                         pk,
 502                         "(sa{sv})s",
 503                         "system-bus-name", 1, "name", "s", sender,
 504                         action);
 505         if (r < 0)
 506                 return r;
 507
 508         r = sd_bus_message_open_container(pk, 'a', "{ss}");
 509         if (r < 0)
 510                 return r;
 511
 512         STRV_FOREACH_PAIR(k, v, details) {
 513                 r = sd_bus_message_append(pk, "{ss}", *k, *v);
 514                 if (r < 0)
 515                         return r;
 516         }
 517
 518         r = sd_bus_message_close_container(pk);
 519         if (r < 0)
 520                 return r;
 521
 522         r = sd_bus_message_append(pk, "us", !!interactive, NULL);
 523         if (r < 0)
 524                 return r;
 525
 526         q = new0(AsyncPolkitQuery, 1);
 527         if (!q)
 528                 return -ENOMEM;
 529
 530         q->request = sd_bus_message_ref(call);
 531         q->callback = callback;
 532         q->userdata = userdata;
 533
 534         r = hashmap_put(*registry, call, q);
 535         if (r < 0) {
 536                 async_polkit_query_free(q);
 537                 return r;
 538         }
 539
 540         q->registry = *registry;
 541
 542         r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0);
 543         if (r < 0) {
 544                 async_polkit_query_free(q);
 545                 return r;
 546         }
 547
 548         return 0;
 549 #endif
 550
 551         return -EACCES;
 552 }
 553
 554 void bus_verify_polkit_async_registry_free(Hashmap *registry) {
 555 #ifdef ENABLE_POLKIT
 556         AsyncPolkitQuery *q;
 557
 558         while ((q = hashmap_steal_first(registry)))
 559                 async_polkit_query_free(q);
 560
 561         hashmap_free(registry);
 562 #endif
 563 }
 564
 565 int bus_check_peercred(sd_bus *c) {
 566         struct ucred ucred;
 567         socklen_t l;
 568         int fd;
 569
 570         assert(c);
 571
 572         fd = sd_bus_get_fd(c);
 573         if (fd < 0)
 574                 return fd;
 575
 576         l = sizeof(struct ucred);
 577         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 578                 return -errno;
 579
 580         if (l != sizeof(struct ucred))
 581                 return -E2BIG;
 582
 583         if (ucred.uid != 0 && ucred.uid != geteuid())
 584                 return -EPERM;
 585
 586         return 1;
 587 }
 588
 589 int bus_connect_system_systemd(sd_bus **_bus) {
 590         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 591         int r;
 592
 593         assert(_bus);
 594
 595         if (geteuid() != 0)
 596                 return sd_bus_default_system(_bus);
 597
 598         /* If we are root then let's talk directly to the system
 599          * instance, instead of going via the bus */
 600
 601         r = sd_bus_new(&bus);
 602         if (r < 0)
 603                 return r;
 604
 605         r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
 606         if (r < 0)
 607                 return r;
 608
 609         r = sd_bus_start(bus);
 610         if (r < 0)
 611                 return sd_bus_default_system(_bus);
 612
 613         r = bus_check_peercred(bus);
 614         if (r < 0)
 615                 return r;
 616
 617         *_bus = bus;
 618         bus = NULL;
 619
 620         return 0;
 621 }
 622
 623 int bus_connect_user_systemd(sd_bus **_bus) {
 624         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 625         _cleanup_free_ char *ee = NULL;
 626         const char *e;
 627         int r;
 628
 629         assert(_bus);
 630
 631         e = secure_getenv("XDG_RUNTIME_DIR");
 632         if (!e)
 633                 return sd_bus_default_user(_bus);
 634
 635         ee = bus_address_escape(e);
 636         if (!ee)
 637                 return -ENOMEM;
 638
 639         r = sd_bus_new(&bus);
 640         if (r < 0)
 641                 return r;
 642
 643         bus->address = strjoin("unix:path=", ee, "/systemd/private");
 644         if (!bus->address)
 645                 return -ENOMEM;
 646
 647         r = sd_bus_start(bus);
 648         if (r < 0)
 649                 return sd_bus_default_user(_bus);
 650
 651         r = bus_check_peercred(bus);
 652         if (r < 0)
 653                 return r;
 654
 655         *_bus = bus;
 656         bus = NULL;
 657
 658         return 0;
 659 }
 660
 661 #define print_property(name, fmt, ...)                                  \
 662         do {                                                            \
 663                 if (value)                                              \
 664                         printf(fmt "\n", __VA_ARGS__);                  \
 665                 else                                                    \
 666                         printf("%s=" fmt "\n", name, __VA_ARGS__);      \
 667         } while(0)
 668
 669 int bus_print_property(const char *name, sd_bus_message *property, bool value, bool all) {
 670         char type;
 671         const char *contents;
 672         int r;
 673
 674         assert(name);
 675         assert(property);
 676
 677         r = sd_bus_message_peek_type(property, &type, &contents);
 678         if (r < 0)
 679                 return r;
 680
 681         switch (type) {
 682
 683         case SD_BUS_TYPE_STRING: {
 684                 const char *s;
 685
 686                 r = sd_bus_message_read_basic(property, type, &s);
 687                 if (r < 0)
 688                         return r;
 689
 690                 if (all || !isempty(s)) {
 691                         bool good;
 692
 693                         /* This property has a single value, so we need to take
 694                          * care not to print a new line, everything else is OK. */
 695                         good = !strchr(s, '\n');
 696                         print_property(name, "%s", good ? s : "[unprintable]");
 697                 }
 698
 699                 return 1;
 700         }
 701
 702         case SD_BUS_TYPE_BOOLEAN: {
 703                 int b;
 704
 705                 r = sd_bus_message_read_basic(property, type, &b);
 706                 if (r < 0)
 707                         return r;
 708
 709                 print_property(name, "%s", yes_no(b));
 710
 711                 return 1;
 712         }
 713
 714         case SD_BUS_TYPE_UINT64: {
 715                 uint64_t u;
 716
 717                 r = sd_bus_message_read_basic(property, type, &u);
 718                 if (r < 0)
 719                         return r;
 720
 721                 /* Yes, heuristics! But we can change this check
 722                  * should it turn out to not be sufficient */
 723
 724                 if (endswith(name, "Timestamp")) {
 725                         char timestamp[FORMAT_TIMESTAMP_MAX], *t;
 726
 727                         t = format_timestamp(timestamp, sizeof(timestamp), u);
 728                         if (t || all)
 729                                 print_property(name, "%s", strempty(t));
 730
 731                 } else if (strstr(name, "USec")) {
 732                         char timespan[FORMAT_TIMESPAN_MAX];
 733
 734                         print_property(name, "%s", format_timespan(timespan, sizeof(timespan), u, 0));
 735                 } else if (streq(name, "RestrictNamespaces")) {
 736                         _cleanup_free_ char *s = NULL;
 737                         const char *result;
 738
 739                         if ((u & NAMESPACE_FLAGS_ALL) == 0)
 740                                 result = "yes";
 741                         else if ((u & NAMESPACE_FLAGS_ALL) == NAMESPACE_FLAGS_ALL)
 742                                 result = "no";
 743                         else {
 744                                 r = namespace_flag_to_string_many(u, &s);
 745                                 if (r < 0)
 746                                         return r;
 747
 748                                 result = s;
 749                         }
 750
 751                         print_property(name, "%s", result);
 752
 753                 } else if (streq(name, "MountFlags")) {
 754                         const char *result;
 755
 756                         result = mount_propagation_flags_to_string(u);
 757                         if (!result)
 758                                 return -EINVAL;
 759
 760                         print_property(name, "%s", result);
 761
 762                 } else if (STR_IN_SET(name, "CapabilityBoundingSet", "AmbientCapabilities")) {
 763                         _cleanup_free_ char *s = NULL;
 764
 765                         r = capability_set_to_string_alloc(u, &s);
 766                         if (r < 0)
 767                                 return r;
 768
 769                         print_property(name, "%s", s);
 770
 771                 } else if ((STR_IN_SET(name, "CPUWeight", "StartupCPUWeight", "IOWeight", "StartupIOWeight") && u == CGROUP_WEIGHT_INVALID) ||
 772                            (STR_IN_SET(name, "CPUShares", "StartupCPUShares") && u == CGROUP_CPU_SHARES_INVALID) ||
 773                            (STR_IN_SET(name, "BlockIOWeight", "StartupBlockIOWeight") && u == CGROUP_BLKIO_WEIGHT_INVALID) ||
 774                            (STR_IN_SET(name, "MemoryCurrent", "TasksCurrent") && u == (uint64_t) -1) ||
 775                            (endswith(name, "NSec") && u == (uint64_t) -1))
 776
 777                         print_property(name, "%s", "[not set]");
 778
 779                 else if ((STR_IN_SET(name, "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit") && u == CGROUP_LIMIT_MAX) ||
 780                          (STR_IN_SET(name, "TasksMax", "DefaultTasksMax") && u == (uint64_t) -1) ||
 781                          (startswith(name, "Limit") && u == (uint64_t) -1) ||
 782                          (startswith(name, "DefaultLimit") && u == (uint64_t) -1))
 783
 784                         print_property(name, "%s", "infinity");
 785                 else
 786                         print_property(name, "%"PRIu64, u);
 787
 788                 return 1;
 789         }
 790
 791         case SD_BUS_TYPE_INT64: {
 792                 int64_t i;
 793
 794                 r = sd_bus_message_read_basic(property, type, &i);
 795                 if (r < 0)
 796                         return r;
 797
 798                 print_property(name, "%"PRIi64, i);
 799
 800                 return 1;
 801         }
 802
 803         case SD_BUS_TYPE_UINT32: {
 804                 uint32_t u;
 805
 806                 r = sd_bus_message_read_basic(property, type, &u);
 807                 if (r < 0)
 808                         return r;
 809
 810                 if (strstr(name, "UMask") || strstr(name, "Mode"))
 811                         print_property(name, "%04o", u);
 812                 else
 813                         print_property(name, "%"PRIu32, u);
 814
 815                 return 1;
 816         }
 817
 818         case SD_BUS_TYPE_INT32: {
 819                 int32_t i;
 820
 821                 r = sd_bus_message_read_basic(property, type, &i);
 822                 if (r < 0)
 823                         return r;
 824
 825                 print_property(name, "%"PRIi32, i);
 826                 return 1;
 827         }
 828
 829         case SD_BUS_TYPE_DOUBLE: {
 830                 double d;
 831
 832                 r = sd_bus_message_read_basic(property, type, &d);
 833                 if (r < 0)
 834                         return r;
 835
 836                 print_property(name, "%g", d);
 837                 return 1;
 838         }
 839
 840         case SD_BUS_TYPE_ARRAY:
 841                 if (streq(contents, "s")) {
 842                         bool first = true;
 843                         const char *str;
 844
 845                         r = sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents);
 846                         if (r < 0)
 847                                 return r;
 848
 849                         while ((r = sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) > 0) {
 850                                 bool good;
 851
 852                                 if (first && !value)
 853                                         printf("%s=", name);
 854
 855                                 /* This property has multiple space-separated values, so
 856                                  * neither spaces not newlines can be allowed in a value. */
 857                                 good = str[strcspn(str, " \n")] == '\0';
 858
 859                                 printf("%s%s", first ? "" : " ", good ? str : "[unprintable]");
 860
 861                                 first = false;
 862                         }
 863                         if (r < 0)
 864                                 return r;
 865
 866                         if (first && all && !value)
 867                                 printf("%s=", name);
 868                         if (!first || all)
 869                                 puts("");
 870
 871                         r = sd_bus_message_exit_container(property);
 872                         if (r < 0)
 873                                 return r;
 874
 875                         return 1;
 876
 877                 } else if (streq(contents, "y")) {
 878                         const uint8_t *u;
 879                         size_t n;
 880
 881                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
 882                         if (r < 0)
 883                                 return r;
 884
 885                         if (all || n > 0) {
 886                                 unsigned int i;
 887
 888                                 if (!value)
 889                                         printf("%s=", name);
 890
 891                                 for (i = 0; i < n; i++)
 892                                         printf("%02x", u[i]);
 893
 894                                 puts("");
 895                         }
 896
 897                         return 1;
 898
 899                 } else if (streq(contents, "u")) {
 900                         uint32_t *u;
 901                         size_t n;
 902
 903                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
 904                         if (r < 0)
 905                                 return r;
 906
 907                         if (all || n > 0) {
 908                                 unsigned int i;
 909
 910                                 if (!value)
 911                                         printf("%s=", name);
 912
 913                                 for (i = 0; i < n; i++)
 914                                         printf("%08x", u[i]);
 915
 916                                 puts("");
 917                         }
 918
 919                         return 1;
 920                 }
 921
 922                 break;
 923         }
 924
 925         return 0;
 926 }
 927
 928 int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool value, bool all) {
 929         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 930         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 931         int r;
 932
 933         assert(bus);
 934         assert(path);
 935
 936         r = sd_bus_call_method(bus,
 937                         dest,
 938                         path,
 939                         "org.freedesktop.DBus.Properties",
 940                         "GetAll",
 941                         &error,
 942                         &reply,
 943                         "s", "");
 944         if (r < 0)
 945                 return r;
 946
 947         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
 948         if (r < 0)
 949                 return r;
 950
 951         while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
 952                 const char *name;
 953                 const char *contents;
 954
 955                 r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name);
 956                 if (r < 0)
 957                         return r;
 958
 959                 if (!filter || strv_find(filter, name)) {
 960                         r = sd_bus_message_peek_type(reply, NULL, &contents);
 961                         if (r < 0)
 962                                 return r;
 963
 964                         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
 965                         if (r < 0)
 966                                 return r;
 967
 968                         r = bus_print_property(name, reply, value, all);
 969                         if (r < 0)
 970                                 return r;
 971                         if (r == 0) {
 972                                 if (all)
 973                                         printf("%s=[unprintable]\n", name);
 974                                 /* skip what we didn't read */
 975                                 r = sd_bus_message_skip(reply, contents);
 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                 } else {
 984                         r = sd_bus_message_skip(reply, "v");
 985                         if (r < 0)
 986                                 return r;
 987                 }
 988
 989                 r = sd_bus_message_exit_container(reply);
 990                 if (r < 0)
 991                         return r;
 992         }
 993         if (r < 0)
 994                 return r;
 995
 996         r = sd_bus_message_exit_container(reply);
 997         if (r < 0)
 998                 return r;
 999
1000         return 0;
1001 }
1002
1003 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1004         sd_id128_t *p = userdata;
1005         const void *v;
1006         size_t n;
1007         int r;
1008
1009         r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
1010         if (r < 0)
1011                 return r;
1012
1013         if (n == 0)
1014                 *p = SD_ID128_NULL;
1015         else if (n == 16)
1016                 memcpy((*p).bytes, v, n);
1017         else
1018                 return -EINVAL;
1019
1020         return 0;
1021 }
1022
1023 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1024         char type;
1025         int r;
1026
1027         r = sd_bus_message_peek_type(m, &type, NULL);
1028         if (r < 0)
1029                 return r;
1030
1031         switch (type) {
1032
1033         case SD_BUS_TYPE_STRING: {
1034                 char **p = userdata;
1035                 const char *s;
1036
1037                 r = sd_bus_message_read_basic(m, type, &s);
1038                 if (r < 0)
1039                         return r;
1040
1041                 if (isempty(s))
1042                         s = NULL;
1043
1044                 return free_and_strdup(p, s);
1045         }
1046
1047         case SD_BUS_TYPE_ARRAY: {
1048                 _cleanup_strv_free_ char **l = NULL;
1049                 char ***p = userdata;
1050
1051                 r = bus_message_read_strv_extend(m, &l);
1052                 if (r < 0)
1053                         return r;
1054
1055                 strv_free(*p);
1056                 *p = l;
1057                 l = NULL;
1058                 return 0;
1059         }
1060
1061         case SD_BUS_TYPE_BOOLEAN: {
1062                 unsigned b;
1063                 int *p = userdata;
1064
1065                 r = sd_bus_message_read_basic(m, type, &b);
1066                 if (r < 0)
1067                         return r;
1068
1069                 *p = b;
1070                 return 0;
1071         }
1072
1073         case SD_BUS_TYPE_INT32:
1074         case SD_BUS_TYPE_UINT32: {
1075                 uint32_t u, *p = userdata;
1076
1077                 r = sd_bus_message_read_basic(m, type, &u);
1078                 if (r < 0)
1079                         return r;
1080
1081                 *p = u;
1082                 return 0;
1083         }
1084
1085         case SD_BUS_TYPE_INT64:
1086         case SD_BUS_TYPE_UINT64: {
1087                 uint64_t t, *p = userdata;
1088
1089                 r = sd_bus_message_read_basic(m, type, &t);
1090                 if (r < 0)
1091                         return r;
1092
1093                 *p = t;
1094                 return 0;
1095         }
1096
1097         case SD_BUS_TYPE_DOUBLE: {
1098                 double d, *p = userdata;
1099
1100                 r = sd_bus_message_read_basic(m, type, &d);
1101                 if (r < 0)
1102                         return r;
1103
1104                 *p = d;
1105                 return 0;
1106         }}
1107
1108         return -EOPNOTSUPP;
1109 }
1110
1111 int bus_message_map_all_properties(
1112                 sd_bus_message *m,
1113                 const struct bus_properties_map *map,
1114                 sd_bus_error *error,
1115                 void *userdata) {
1116
1117         int r;
1118
1119         assert(m);
1120         assert(map);
1121
1122         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
1123         if (r < 0)
1124                 return r;
1125
1126         while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
1127                 const struct bus_properties_map *prop;
1128                 const char *member;
1129                 const char *contents;
1130                 void *v;
1131                 unsigned i;
1132
1133                 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
1134                 if (r < 0)
1135                         return r;
1136
1137                 for (i = 0, prop = NULL; map[i].member; i++)
1138                         if (streq(map[i].member, member)) {
1139                                 prop = &map[i];
1140                                 break;
1141                         }
1142
1143                 if (prop) {
1144                         r = sd_bus_message_peek_type(m, NULL, &contents);
1145                         if (r < 0)
1146                                 return r;
1147
1148                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
1149                         if (r < 0)
1150                                 return r;
1151
1152                         v = (uint8_t *)userdata + prop->offset;
1153                         if (map[i].set)
1154                                 r = prop->set(sd_bus_message_get_bus(m), member, m, error, v);
1155                         else
1156                                 r = map_basic(sd_bus_message_get_bus(m), member, m, error, v);
1157                         if (r < 0)
1158                                 return r;
1159
1160                         r = sd_bus_message_exit_container(m);
1161                         if (r < 0)
1162                                 return r;
1163                 } else {
1164                         r = sd_bus_message_skip(m, "v");
1165                         if (r < 0)
1166                                 return r;
1167                 }
1168
1169                 r = sd_bus_message_exit_container(m);
1170                 if (r < 0)
1171                         return r;
1172         }
1173         if (r < 0)
1174                 return r;
1175
1176         return sd_bus_message_exit_container(m);
1177 }
1178
1179 int bus_message_map_properties_changed(
1180                 sd_bus_message *m,
1181                 const struct bus_properties_map *map,
1182                 sd_bus_error *error,
1183                 void *userdata) {
1184
1185         const char *member;
1186         int r, invalidated, i;
1187
1188         assert(m);
1189         assert(map);
1190
1191         r = bus_message_map_all_properties(m, map, error, userdata);
1192         if (r < 0)
1193                 return r;
1194
1195         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
1196         if (r < 0)
1197                 return r;
1198
1199         invalidated = 0;
1200         while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
1201                 for (i = 0; map[i].member; i++)
1202                         if (streq(map[i].member, member)) {
1203                                 ++invalidated;
1204                                 break;
1205                         }
1206         if (r < 0)
1207                 return r;
1208
1209         r = sd_bus_message_exit_container(m);
1210         if (r < 0)
1211                 return r;
1212
1213         return invalidated;
1214 }
1215
1216 int bus_map_all_properties(
1217                 sd_bus *bus,
1218                 const char *destination,
1219                 const char *path,
1220                 const struct bus_properties_map *map,
1221                 sd_bus_error *error,
1222                 void *userdata) {
1223
1224         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1225         int r;
1226
1227         assert(bus);
1228         assert(destination);
1229         assert(path);
1230         assert(map);
1231
1232         r = sd_bus_call_method(
1233                         bus,
1234                         destination,
1235                         path,
1236                         "org.freedesktop.DBus.Properties",
1237                         "GetAll",
1238                         error,
1239                         &m,
1240                         "s", "");
1241         if (r < 0)
1242                 return r;
1243
1244         return bus_message_map_all_properties(m, map, error, userdata);
1245 }
1246
1247 int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **ret) {
1248         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
1249         int r;
1250
1251         assert(transport >= 0);
1252         assert(transport < _BUS_TRANSPORT_MAX);
1253         assert(ret);
1254
1255         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1256         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1257
1258         switch (transport) {
1259
1260         case BUS_TRANSPORT_LOCAL:
1261                 if (user)
1262                         r = sd_bus_default_user(&bus);
1263                 else
1264                         r = sd_bus_default_system(&bus);
1265
1266                 break;
1267
1268         case BUS_TRANSPORT_REMOTE:
1269                 r = sd_bus_open_system_remote(&bus, host);
1270                 break;
1271
1272         case BUS_TRANSPORT_MACHINE:
1273                 r = sd_bus_open_system_machine(&bus, host);
1274                 break;
1275
1276         default:
1277                 assert_not_reached("Hmm, unknown transport type.");
1278         }
1279         if (r < 0)
1280                 return r;
1281
1282         r = sd_bus_set_exit_on_disconnect(bus, true);
1283         if (r < 0)
1284                 return r;
1285
1286         *ret = bus;
1287         bus = NULL;
1288
1289         return 0;
1290 }
1291
1292 int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1293         int r;
1294
1295         assert(transport >= 0);
1296         assert(transport < _BUS_TRANSPORT_MAX);
1297         assert(bus);
1298
1299         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1300         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1301
1302         switch (transport) {
1303
1304         case BUS_TRANSPORT_LOCAL:
1305                 if (user)
1306                         r = bus_connect_user_systemd(bus);
1307                 else
1308                         r = bus_connect_system_systemd(bus);
1309
1310                 break;
1311
1312         case BUS_TRANSPORT_REMOTE:
1313                 r = sd_bus_open_system_remote(bus, host);
1314                 break;
1315
1316         case BUS_TRANSPORT_MACHINE:
1317                 r = sd_bus_open_system_machine(bus, host);
1318                 break;
1319
1320         default:
1321                 assert_not_reached("Hmm, unknown transport type.");
1322         }
1323
1324         return r;
1325 }
1326
1327 int bus_property_get_bool(
1328                 sd_bus *bus,
1329                 const char *path,
1330                 const char *interface,
1331                 const char *property,
1332                 sd_bus_message *reply,
1333                 void *userdata,
1334                 sd_bus_error *error) {
1335
1336         int b = *(bool*) userdata;
1337
1338         return sd_bus_message_append_basic(reply, 'b', &b);
1339 }
1340
1341 int bus_property_get_id128(
1342                 sd_bus *bus,
1343                 const char *path,
1344                 const char *interface,
1345                 const char *property,
1346                 sd_bus_message *reply,
1347                 void *userdata,
1348                 sd_bus_error *error) {
1349
1350         sd_id128_t *id = userdata;
1351
1352         if (sd_id128_is_null(*id)) /* Add an empty array if the ID is zero */
1353                 return sd_bus_message_append(reply, "ay", 0);
1354         else
1355                 return sd_bus_message_append_array(reply, 'y', id->bytes, 16);
1356 }
1357
1358 #if __SIZEOF_SIZE_T__ != 8
1359 int bus_property_get_size(
1360                 sd_bus *bus,
1361                 const char *path,
1362                 const char *interface,
1363                 const char *property,
1364                 sd_bus_message *reply,
1365                 void *userdata,
1366                 sd_bus_error *error) {
1367
1368         uint64_t sz = *(size_t*) userdata;
1369
1370         return sd_bus_message_append_basic(reply, 't', &sz);
1371 }
1372 #endif
1373
1374 #if __SIZEOF_LONG__ != 8
1375 int bus_property_get_long(
1376                 sd_bus *bus,
1377                 const char *path,
1378                 const char *interface,
1379                 const char *property,
1380                 sd_bus_message *reply,
1381                 void *userdata,
1382                 sd_bus_error *error) {
1383
1384         int64_t l = *(long*) userdata;
1385
1386         return sd_bus_message_append_basic(reply, 'x', &l);
1387 }
1388
1389 int bus_property_get_ulong(
1390                 sd_bus *bus,
1391                 const char *path,
1392                 const char *interface,
1393                 const char *property,
1394                 sd_bus_message *reply,
1395                 void *userdata,
1396                 sd_bus_error *error) {
1397
1398         uint64_t ul = *(unsigned long*) userdata;
1399
1400         return sd_bus_message_append_basic(reply, 't', &ul);
1401 }
1402 #endif
1403
1404 int bus_log_parse_error(int r) {
1405         return log_error_errno(r, "Failed to parse bus message: %m");
1406 }
1407
1408 int bus_log_create_error(int r) {
1409         return log_error_errno(r, "Failed to create bus message: %m");
1410 }
1411
1412 /**
1413  * bus_path_encode_unique() - encode unique object path
1414  * @b: bus connection or NULL
1415  * @prefix: object path prefix
1416  * @sender_id: unique-name of client, or NULL
1417  * @external_id: external ID to be chosen by client, or NULL
1418  * @ret_path: storage for encoded object path pointer
1419  *
1420  * Whenever we provide a bus API that allows clients to create and manage
1421  * server-side objects, we need to provide a unique name for these objects. If
1422  * we let the server choose the name, we suffer from a race condition: If a
1423  * client creates an object asynchronously, it cannot destroy that object until
1424  * it received the method reply. It cannot know the name of the new object,
1425  * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
1426  *
1427  * Therefore, many APIs allow the client to choose the unique name for newly
1428  * created objects. There're two problems to solve, though:
1429  *    1) Object names are usually defined via dbus object paths, which are
1430  *       usually globally namespaced. Therefore, multiple clients must be able
1431  *       to choose unique object names without interference.
1432  *    2) If multiple libraries share the same bus connection, they must be
1433  *       able to choose unique object names without interference.
1434  * The first problem is solved easily by prefixing a name with the
1435  * unique-bus-name of a connection. The server side must enforce this and
1436  * reject any other name. The second problem is solved by providing unique
1437  * suffixes from within sd-bus.
1438  *
1439  * This helper allows clients to create unique object-paths. It uses the
1440  * template '/prefix/sender_id/external_id' and returns the new path in
1441  * @ret_path (must be freed by the caller).
1442  * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
1443  * NULL, this function allocates a unique suffix via @b (by requesting a new
1444  * cookie). If both @sender_id and @external_id are given, @b can be passed as
1445  * NULL.
1446  *
1447  * Returns: 0 on success, negative error code on failure.
1448  */
1449 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
1450         _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
1451         char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
1452         int r;
1453
1454         assert_return(b || (sender_id && external_id), -EINVAL);
1455         assert_return(object_path_is_valid(prefix), -EINVAL);
1456         assert_return(ret_path, -EINVAL);
1457
1458         if (!sender_id) {
1459                 r = sd_bus_get_unique_name(b, &sender_id);
1460                 if (r < 0)
1461                         return r;
1462         }
1463
1464         if (!external_id) {
1465                 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
1466                 external_id = external_buf;
1467         }
1468
1469         sender_label = bus_label_escape(sender_id);
1470         if (!sender_label)
1471                 return -ENOMEM;
1472
1473         external_label = bus_label_escape(external_id);
1474         if (!external_label)
1475                 return -ENOMEM;
1476
1477         p = strjoin(prefix, "/", sender_label, "/", external_label);
1478         if (!p)
1479                 return -ENOMEM;
1480
1481         *ret_path = p;
1482         return 0;
1483 }
1484
1485 /**
1486  * bus_path_decode_unique() - decode unique object path
1487  * @path: object path to decode
1488  * @prefix: object path prefix
1489  * @ret_sender: output parameter for sender-id label
1490  * @ret_external: output parameter for external-id label
1491  *
1492  * This does the reverse of bus_path_encode_unique() (see its description for
1493  * details). Both trailing labels, sender-id and external-id, are unescaped and
1494  * returned in the given output parameters (the caller must free them).
1495  *
1496  * Note that this function returns 0 if the path does not match the template
1497  * (see bus_path_encode_unique()), 1 if it matched.
1498  *
1499  * Returns: Negative error code on failure, 0 if the given object path does not
1500  *          match the template (return parameters are set to NULL), 1 if it was
1501  *          parsed successfully (return parameters contain allocated labels).
1502  */
1503 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
1504         const char *p, *q;
1505         char *sender, *external;
1506
1507         assert(object_path_is_valid(path));
1508         assert(object_path_is_valid(prefix));
1509         assert(ret_sender);
1510         assert(ret_external);
1511
1512         p = object_path_startswith(path, prefix);
1513         if (!p) {
1514                 *ret_sender = NULL;
1515                 *ret_external = NULL;
1516                 return 0;
1517         }
1518
1519         q = strchr(p, '/');
1520         if (!q) {
1521                 *ret_sender = NULL;
1522                 *ret_external = NULL;
1523                 return 0;
1524         }
1525
1526         sender = bus_label_unescape_n(p, q - p);
1527         external = bus_label_unescape(q + 1);
1528         if (!sender || !external) {
1529                 free(sender);
1530                 free(external);
1531                 return -ENOMEM;
1532         }
1533
1534         *ret_sender = sender;
1535         *ret_external = external;
1536         return 1;
1537 }
1538
1539 int bus_property_get_rlimit(
1540                 sd_bus *bus,
1541                 const char *path,
1542                 const char *interface,
1543                 const char *property,
1544                 sd_bus_message *reply,
1545                 void *userdata,
1546                 sd_bus_error *error) {
1547
1548         struct rlimit *rl;
1549         uint64_t u;
1550         rlim_t x;
1551         const char *is_soft;
1552
1553         assert(bus);
1554         assert(reply);
1555         assert(userdata);
1556
1557         is_soft = endswith(property, "Soft");
1558         rl = *(struct rlimit**) userdata;
1559         if (rl)
1560                 x = is_soft ? rl->rlim_cur : rl->rlim_max;
1561         else {
1562                 struct rlimit buf = {};
1563                 int z;
1564                 const char *s;
1565
1566                 s = is_soft ? strndupa(property, is_soft - property) : property;
1567
1568                 z = rlimit_from_string(strstr(s, "Limit"));
1569                 assert(z >= 0);
1570
1571                 getrlimit(z, &buf);
1572                 x = is_soft ? buf.rlim_cur : buf.rlim_max;
1573         }
1574
1575         /* rlim_t might have different sizes, let's map
1576          * RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on
1577          * all archs */
1578         u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
1579
1580         return sd_bus_message_append(reply, "t", u);
1581 }
1582
1583 int bus_track_add_name_many(sd_bus_track *t, char **l) {
1584         int r = 0;
1585         char **i;
1586
1587         assert(t);
1588
1589         /* Continues adding after failure, and returns the first failure. */
1590
1591         STRV_FOREACH(i, l) {
1592                 int k;
1593
1594                 k = sd_bus_track_add_name(t, *i);
1595                 if (k < 0 && r >= 0)
1596                         r = k;
1597         }
1598
1599         return r;
1600 }