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 #if 0 /// UNNEEDED by elogind
  58 static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
  59         sd_event *e = userdata;
  60
  61         assert(m);
  62         assert(e);
  63
  64         sd_bus_close(sd_bus_message_get_bus(m));
  65         sd_event_exit(e, 0);
  66
  67         return 1;
  68 }
  69
  70 int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) {
  71         _cleanup_free_ char *match = NULL;
  72         const char *unique;
  73         int r;
  74
  75         assert(e);
  76         assert(bus);
  77         assert(name);
  78
  79         /* We unregister the name here and then wait for the
  80          * NameOwnerChanged signal for this event to arrive before we
  81          * quit. We do this in order to make sure that any queued
  82          * requests are still processed before we really exit. */
  83
  84         r = sd_bus_get_unique_name(bus, &unique);
  85         if (r < 0)
  86                 return r;
  87
  88         r = asprintf(&match,
  89                      "sender='org.freedesktop.DBus',"
  90                      "type='signal',"
  91                      "interface='org.freedesktop.DBus',"
  92                      "member='NameOwnerChanged',"
  93                      "path='/org/freedesktop/DBus',"
  94                      "arg0='%s',"
  95                      "arg1='%s',"
  96                      "arg2=''", name, unique);
  97         if (r < 0)
  98                 return -ENOMEM;
  99
 100         r = sd_bus_add_match(bus, NULL, match, name_owner_change_callback, e);
 101         if (r < 0)
 102                 return r;
 103
 104         r = sd_bus_release_name(bus, name);
 105         if (r < 0)
 106                 return r;
 107
 108         return 0;
 109 }
 110
 111 int bus_event_loop_with_idle(
 112                 sd_event *e,
 113                 sd_bus *bus,
 114                 const char *name,
 115                 usec_t timeout,
 116                 check_idle_t check_idle,
 117                 void *userdata) {
 118         bool exiting = false;
 119         int r, code;
 120
 121         assert(e);
 122         assert(bus);
 123         assert(name);
 124
 125         for (;;) {
 126                 bool idle;
 127
 128                 r = sd_event_get_state(e);
 129                 if (r < 0)
 130                         return r;
 131                 if (r == SD_EVENT_FINISHED)
 132                         break;
 133
 134                 if (check_idle)
 135                         idle = check_idle(userdata);
 136                 else
 137                         idle = true;
 138
 139                 r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout);
 140                 if (r < 0)
 141                         return r;
 142
 143                 if (r == 0 && !exiting && idle) {
 144
 145                         r = sd_bus_try_close(bus);
 146                         if (r == -EBUSY)
 147                                 continue;
 148
 149                         /* Fallback for dbus1 connections: we
 150                          * unregister the name and wait for the
 151                          * response to come through for it */
 152                         if (r == -EOPNOTSUPP) {
 153
 154                                 /* Inform the service manager that we
 155                                  * are going down, so that it will
 156                                  * queue all further start requests,
 157                                  * instead of assuming we are already
 158                                  * running. */
 159                                 sd_notify(false, "STOPPING=1");
 160
 161                                 r = bus_async_unregister_and_exit(e, bus, name);
 162                                 if (r < 0)
 163                                         return r;
 164
 165                                 exiting = true;
 166                                 continue;
 167                         }
 168
 169                         if (r < 0)
 170                                 return r;
 171
 172                         sd_event_exit(e, 0);
 173                         break;
 174                 }
 175         }
 176
 177         r = sd_event_get_exit_code(e, &code);
 178         if (r < 0)
 179                 return r;
 180
 181         return code;
 182 }
 183 #endif // 0
 184
 185 int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) {
 186         _cleanup_(sd_bus_message_unrefp) sd_bus_message *rep = NULL;
 187         int r, has_owner = 0;
 188
 189         assert(c);
 190         assert(name);
 191
 192         r = sd_bus_call_method(c,
 193                                "org.freedesktop.DBus",
 194                                "/org/freedesktop/dbus",
 195                                "org.freedesktop.DBus",
 196                                "NameHasOwner",
 197                                error,
 198                                &rep,
 199                                "s",
 200                                name);
 201         if (r < 0)
 202                 return r;
 203
 204         r = sd_bus_message_read_basic(rep, 'b', &has_owner);
 205         if (r < 0)
 206                 return sd_bus_error_set_errno(error, r);
 207
 208         return has_owner;
 209 }
 210
 211 static int check_good_user(sd_bus_message *m, uid_t good_user) {
 212         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 213         uid_t sender_uid;
 214         int r;
 215
 216         assert(m);
 217
 218         if (good_user == UID_INVALID)
 219                 return 0;
 220
 221         r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds);
 222         if (r < 0)
 223                 return r;
 224
 225         /* Don't trust augmented credentials for authorization */
 226         assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM);
 227
 228         r = sd_bus_creds_get_euid(creds, &sender_uid);
 229         if (r < 0)
 230                 return r;
 231
 232         return sender_uid == good_user;
 233 }
 234
 235 int bus_test_polkit(
 236                 sd_bus_message *call,
 237                 int capability,
 238                 const char *action,
 239                 const char **details,
 240                 uid_t good_user,
 241                 bool *_challenge,
 242                 sd_bus_error *e) {
 243
 244         int r;
 245
 246         assert(call);
 247         assert(action);
 248
 249         /* Tests non-interactively! */
 250
 251         r = check_good_user(call, good_user);
 252         if (r != 0)
 253                 return r;
 254
 255         r = sd_bus_query_sender_privilege(call, capability);
 256         if (r < 0)
 257                 return r;
 258         else if (r > 0)
 259                 return 1;
 260 #if ENABLE_POLKIT
 261         else {
 262                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *request = NULL;
 263                 _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 264                 int authorized = false, challenge = false;
 265                 const char *sender, **k, **v;
 266
 267                 sender = sd_bus_message_get_sender(call);
 268                 if (!sender)
 269                         return -EBADMSG;
 270
 271                 r = sd_bus_message_new_method_call(
 272                                 call->bus,
 273                                 &request,
 274                                 "org.freedesktop.PolicyKit1",
 275                                 "/org/freedesktop/PolicyKit1/Authority",
 276                                 "org.freedesktop.PolicyKit1.Authority",
 277                                 "CheckAuthorization");
 278                 if (r < 0)
 279                         return r;
 280
 281                 r = sd_bus_message_append(
 282                                 request,
 283                                 "(sa{sv})s",
 284                                 "system-bus-name", 1, "name", "s", sender,
 285                                 action);
 286                 if (r < 0)
 287                         return r;
 288
 289                 r = sd_bus_message_open_container(request, 'a', "{ss}");
 290                 if (r < 0)
 291                         return r;
 292
 293                 STRV_FOREACH_PAIR(k, v, details) {
 294                         r = sd_bus_message_append(request, "{ss}", *k, *v);
 295                         if (r < 0)
 296                                 return r;
 297                 }
 298
 299                 r = sd_bus_message_close_container(request);
 300                 if (r < 0)
 301                         return r;
 302
 303                 r = sd_bus_message_append(request, "us", 0, NULL);
 304                 if (r < 0)
 305                         return r;
 306
 307                 r = sd_bus_call(call->bus, request, 0, e, &reply);
 308                 if (r < 0) {
 309                         /* Treat no PK available as access denied */
 310                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
 311                                 sd_bus_error_free(e);
 312                                 return -EACCES;
 313                         }
 314
 315                         return r;
 316                 }
 317
 318                 r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
 319                 if (r < 0)
 320                         return r;
 321
 322                 r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
 323                 if (r < 0)
 324                         return r;
 325
 326                 if (authorized)
 327                         return 1;
 328
 329                 if (_challenge) {
 330                         *_challenge = challenge;
 331                         return 0;
 332                 }
 333         }
 334 #endif
 335
 336         return -EACCES;
 337 }
 338
 339 #if ENABLE_POLKIT
 340
 341 typedef struct AsyncPolkitQuery {
 342         sd_bus_message *request, *reply;
 343         sd_bus_message_handler_t callback;
 344         void *userdata;
 345         sd_bus_slot *slot;
 346         Hashmap *registry;
 347 } AsyncPolkitQuery;
 348
 349 static void async_polkit_query_free(AsyncPolkitQuery *q) {
 350
 351         if (!q)
 352                 return;
 353
 354         sd_bus_slot_unref(q->slot);
 355
 356         if (q->registry && q->request)
 357                 hashmap_remove(q->registry, q->request);
 358
 359         sd_bus_message_unref(q->request);
 360         sd_bus_message_unref(q->reply);
 361
 362         free(q);
 363 }
 364
 365 static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) {
 366         _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
 367         AsyncPolkitQuery *q = userdata;
 368         int r;
 369
 370         assert(reply);
 371         assert(q);
 372
 373         q->slot = sd_bus_slot_unref(q->slot);
 374         q->reply = sd_bus_message_ref(reply);
 375
 376         r = sd_bus_message_rewind(q->request, true);
 377         if (r < 0) {
 378                 r = sd_bus_reply_method_errno(q->request, r, NULL);
 379                 goto finish;
 380         }
 381
 382         r = q->callback(q->request, q->userdata, &error_buffer);
 383         r = bus_maybe_reply_error(q->request, r, &error_buffer);
 384
 385 finish:
 386         async_polkit_query_free(q);
 387
 388         return r;
 389 }
 390
 391 #endif
 392
 393 int bus_verify_polkit_async(
 394                 sd_bus_message *call,
 395                 int capability,
 396                 const char *action,
 397                 const char **details,
 398                 bool interactive,
 399                 uid_t good_user,
 400                 Hashmap **registry,
 401                 sd_bus_error *error) {
 402
 403 #if ENABLE_POLKIT
 404         _cleanup_(sd_bus_message_unrefp) sd_bus_message *pk = NULL;
 405         AsyncPolkitQuery *q;
 406         const char *sender, **k, **v;
 407         sd_bus_message_handler_t callback;
 408         void *userdata;
 409         int c;
 410 #endif
 411         int r;
 412
 413         assert(call);
 414         assert(action);
 415         assert(registry);
 416
 417         r = check_good_user(call, good_user);
 418         if (r != 0)
 419                 return r;
 420
 421 #if ENABLE_POLKIT
 422         q = hashmap_get(*registry, call);
 423         if (q) {
 424                 int authorized, challenge;
 425
 426                 /* This is the second invocation of this function, and
 427                  * there's already a response from polkit, let's
 428                  * process it */
 429                 assert(q->reply);
 430
 431                 if (sd_bus_message_is_method_error(q->reply, NULL)) {
 432                         const sd_bus_error *e;
 433
 434                         /* Copy error from polkit reply */
 435                         e = sd_bus_message_get_error(q->reply);
 436                         sd_bus_error_copy(error, e);
 437
 438                         /* Treat no PK available as access denied */
 439                         if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN))
 440                                 return -EACCES;
 441
 442                         return -sd_bus_error_get_errno(e);
 443                 }
 444
 445                 r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}");
 446                 if (r >= 0)
 447                         r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge);
 448
 449                 if (r < 0)
 450                         return r;
 451
 452                 if (authorized)
 453                         return 1;
 454
 455                 if (challenge)
 456                         return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required.");
 457
 458                 return -EACCES;
 459         }
 460 #endif
 461
 462         r = sd_bus_query_sender_privilege(call, capability);
 463         if (r < 0)
 464                 return r;
 465         else if (r > 0)
 466                 return 1;
 467
 468 #if ENABLE_POLKIT
 469         if (sd_bus_get_current_message(call->bus) != call)
 470                 return -EINVAL;
 471
 472         callback = sd_bus_get_current_handler(call->bus);
 473         if (!callback)
 474                 return -EINVAL;
 475
 476         userdata = sd_bus_get_current_userdata(call->bus);
 477
 478         sender = sd_bus_message_get_sender(call);
 479         if (!sender)
 480                 return -EBADMSG;
 481
 482         c = sd_bus_message_get_allow_interactive_authorization(call);
 483         if (c < 0)
 484                 return c;
 485         if (c > 0)
 486                 interactive = true;
 487
 488         r = hashmap_ensure_allocated(registry, NULL);
 489         if (r < 0)
 490                 return r;
 491
 492         r = sd_bus_message_new_method_call(
 493                         call->bus,
 494                         &pk,
 495                         "org.freedesktop.PolicyKit1",
 496                         "/org/freedesktop/PolicyKit1/Authority",
 497                         "org.freedesktop.PolicyKit1.Authority",
 498                         "CheckAuthorization");
 499         if (r < 0)
 500                 return r;
 501
 502         r = sd_bus_message_append(
 503                         pk,
 504                         "(sa{sv})s",
 505                         "system-bus-name", 1, "name", "s", sender,
 506                         action);
 507         if (r < 0)
 508                 return r;
 509
 510         r = sd_bus_message_open_container(pk, 'a', "{ss}");
 511         if (r < 0)
 512                 return r;
 513
 514         STRV_FOREACH_PAIR(k, v, details) {
 515                 r = sd_bus_message_append(pk, "{ss}", *k, *v);
 516                 if (r < 0)
 517                         return r;
 518         }
 519
 520         r = sd_bus_message_close_container(pk);
 521         if (r < 0)
 522                 return r;
 523
 524         r = sd_bus_message_append(pk, "us", !!interactive, NULL);
 525         if (r < 0)
 526                 return r;
 527
 528         q = new0(AsyncPolkitQuery, 1);
 529         if (!q)
 530                 return -ENOMEM;
 531
 532         q->request = sd_bus_message_ref(call);
 533         q->callback = callback;
 534         q->userdata = userdata;
 535
 536         r = hashmap_put(*registry, call, q);
 537         if (r < 0) {
 538                 async_polkit_query_free(q);
 539                 return r;
 540         }
 541
 542         q->registry = *registry;
 543
 544         r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0);
 545         if (r < 0) {
 546                 async_polkit_query_free(q);
 547                 return r;
 548         }
 549
 550         return 0;
 551 #endif
 552
 553         return -EACCES;
 554 }
 555
 556 void bus_verify_polkit_async_registry_free(Hashmap *registry) {
 557 #if ENABLE_POLKIT
 558         hashmap_free_with_destructor(registry, async_polkit_query_free);
 559 #endif
 560 }
 561
 562 #if 0 /// UNNEEDED by elogind
 563 int bus_check_peercred(sd_bus *c) {
 564         struct ucred ucred;
 565         socklen_t l;
 566         int fd;
 567
 568         assert(c);
 569
 570         fd = sd_bus_get_fd(c);
 571         if (fd < 0)
 572                 return fd;
 573
 574         l = sizeof(struct ucred);
 575         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 576                 return -errno;
 577
 578         if (l != sizeof(struct ucred))
 579                 return -E2BIG;
 580
 581         if (ucred.uid != 0 && ucred.uid != geteuid())
 582                 return -EPERM;
 583
 584         return 1;
 585 }
 586
 587 int bus_connect_system_systemd(sd_bus **_bus) {
 588         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 589         int r;
 590
 591         assert(_bus);
 592
 593         if (geteuid() != 0)
 594                 return sd_bus_default_system(_bus);
 595
 596         /* If we are root then let's talk directly to the system
 597          * instance, instead of going via the bus */
 598
 599         r = sd_bus_new(&bus);
 600         if (r < 0)
 601                 return r;
 602
 603         r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
 604         if (r < 0)
 605                 return r;
 606
 607         r = sd_bus_start(bus);
 608         if (r < 0)
 609                 return sd_bus_default_system(_bus);
 610
 611         r = bus_check_peercred(bus);
 612         if (r < 0)
 613                 return r;
 614
 615         *_bus = bus;
 616         bus = NULL;
 617
 618         return 0;
 619 }
 620
 621 int bus_connect_user_systemd(sd_bus **_bus) {
 622         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
 623         _cleanup_free_ char *ee = NULL;
 624         const char *e;
 625         int r;
 626
 627         assert(_bus);
 628
 629         e = secure_getenv("XDG_RUNTIME_DIR");
 630         if (!e)
 631                 return sd_bus_default_user(_bus);
 632
 633         ee = bus_address_escape(e);
 634         if (!ee)
 635                 return -ENOMEM;
 636
 637         r = sd_bus_new(&bus);
 638         if (r < 0)
 639                 return r;
 640
 641         bus->address = strjoin("unix:path=", ee, "/systemd/private");
 642         if (!bus->address)
 643                 return -ENOMEM;
 644
 645         r = sd_bus_start(bus);
 646         if (r < 0)
 647                 return sd_bus_default_user(_bus);
 648
 649         r = bus_check_peercred(bus);
 650         if (r < 0)
 651                 return r;
 652
 653         *_bus = bus;
 654         bus = NULL;
 655
 656         return 0;
 657 }
 658 #endif // 0
 659
 660 #define print_property(name, fmt, ...)                                  \
 661         do {                                                            \
 662                 if (value)                                              \
 663                         printf(fmt "\n", __VA_ARGS__);                  \
 664                 else                                                    \
 665                         printf("%s=" fmt "\n", name, __VA_ARGS__);      \
 666         } while (0)
 667
 668 int bus_print_property(const char *name, sd_bus_message *property, bool value, bool all) {
 669         char type;
 670         const char *contents;
 671         int r;
 672
 673         assert(name);
 674         assert(property);
 675
 676         r = sd_bus_message_peek_type(property, &type, &contents);
 677         if (r < 0)
 678                 return r;
 679
 680         switch (type) {
 681
 682         case SD_BUS_TYPE_STRING: {
 683                 const char *s;
 684
 685                 r = sd_bus_message_read_basic(property, type, &s);
 686                 if (r < 0)
 687                         return r;
 688
 689                 if (all || !isempty(s)) {
 690                         bool good;
 691
 692                         /* This property has a single value, so we need to take
 693                          * care not to print a new line, everything else is OK. */
 694                         good = !strchr(s, '\n');
 695                         print_property(name, "%s", good ? s : "[unprintable]");
 696                 }
 697
 698                 return 1;
 699         }
 700
 701         case SD_BUS_TYPE_BOOLEAN: {
 702                 int b;
 703
 704                 r = sd_bus_message_read_basic(property, type, &b);
 705                 if (r < 0)
 706                         return r;
 707
 708                 print_property(name, "%s", yes_no(b));
 709
 710                 return 1;
 711         }
 712
 713         case SD_BUS_TYPE_UINT64: {
 714                 uint64_t u;
 715
 716                 r = sd_bus_message_read_basic(property, type, &u);
 717                 if (r < 0)
 718                         return r;
 719
 720                 /* Yes, heuristics! But we can change this check
 721                  * should it turn out to not be sufficient */
 722
 723                 if (endswith(name, "Timestamp")) {
 724                         char timestamp[FORMAT_TIMESTAMP_MAX], *t;
 725
 726                         t = format_timestamp(timestamp, sizeof(timestamp), u);
 727                         if (t || all)
 728                                 print_property(name, "%s", strempty(t));
 729
 730                 } else if (strstr(name, "USec")) {
 731                         char timespan[FORMAT_TIMESPAN_MAX];
 732
 733                         print_property(name, "%s", format_timespan(timespan, sizeof(timespan), u, 0));
 734                 } else if (streq(name, "RestrictNamespaces")) {
 735                         _cleanup_free_ char *s = NULL;
 736                         const char *result;
 737
 738                         if ((u & NAMESPACE_FLAGS_ALL) == 0)
 739                                 result = "yes";
 740                         else if ((u & NAMESPACE_FLAGS_ALL) == NAMESPACE_FLAGS_ALL)
 741                                 result = "no";
 742                         else {
 743                                 r = namespace_flag_to_string_many(u, &s);
 744                                 if (r < 0)
 745                                         return r;
 746
 747                                 result = s;
 748                         }
 749
 750                         print_property(name, "%s", result);
 751
 752                 } else if (streq(name, "MountFlags")) {
 753                         const char *result;
 754
 755                         result = mount_propagation_flags_to_string(u);
 756                         if (!result)
 757                                 return -EINVAL;
 758
 759                         print_property(name, "%s", result);
 760
 761                 } else if (STR_IN_SET(name, "CapabilityBoundingSet", "AmbientCapabilities")) {
 762                         _cleanup_free_ char *s = NULL;
 763
 764                         r = capability_set_to_string_alloc(u, &s);
 765                         if (r < 0)
 766                                 return r;
 767
 768                         print_property(name, "%s", s);
 769
 770                 } else if ((STR_IN_SET(name, "CPUWeight", "StartupCPUWeight", "IOWeight", "StartupIOWeight") && u == CGROUP_WEIGHT_INVALID) ||
 771                            (STR_IN_SET(name, "CPUShares", "StartupCPUShares") && u == CGROUP_CPU_SHARES_INVALID) ||
 772                            (STR_IN_SET(name, "BlockIOWeight", "StartupBlockIOWeight") && u == CGROUP_BLKIO_WEIGHT_INVALID) ||
 773                            (STR_IN_SET(name, "MemoryCurrent", "TasksCurrent") && u == (uint64_t) -1) ||
 774                            (endswith(name, "NSec") && u == (uint64_t) -1))
 775
 776                         print_property(name, "%s", "[not set]");
 777
 778                 else if ((STR_IN_SET(name, "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit") && u == CGROUP_LIMIT_MAX) ||
 779                          (STR_IN_SET(name, "TasksMax", "DefaultTasksMax") && u == (uint64_t) -1) ||
 780                          (startswith(name, "Limit") && u == (uint64_t) -1) ||
 781                          (startswith(name, "DefaultLimit") && u == (uint64_t) -1))
 782
 783                         print_property(name, "%s", "infinity");
 784                 else
 785                         print_property(name, "%"PRIu64, u);
 786
 787                 return 1;
 788         }
 789
 790         case SD_BUS_TYPE_INT64: {
 791                 int64_t i;
 792
 793                 r = sd_bus_message_read_basic(property, type, &i);
 794                 if (r < 0)
 795                         return r;
 796
 797                 print_property(name, "%"PRIi64, i);
 798
 799                 return 1;
 800         }
 801
 802         case SD_BUS_TYPE_UINT32: {
 803                 uint32_t u;
 804
 805                 r = sd_bus_message_read_basic(property, type, &u);
 806                 if (r < 0)
 807                         return r;
 808
 809                 if (strstr(name, "UMask") || strstr(name, "Mode"))
 810                         print_property(name, "%04o", u);
 811                 else if (streq(name, "UID")) {
 812                         if (u == UID_INVALID)
 813                                 print_property(name, "%s", "[not set]");
 814                         else
 815                                 print_property(name, "%"PRIu32, u);
 816                 } else if (streq(name, "GID")) {
 817                         if (u == GID_INVALID)
 818                                 print_property(name, "%s", "[not set]");
 819                         else
 820                                 print_property(name, "%"PRIu32, u);
 821                 } else
 822                         print_property(name, "%"PRIu32, u);
 823
 824                 return 1;
 825         }
 826
 827         case SD_BUS_TYPE_INT32: {
 828                 int32_t i;
 829
 830                 r = sd_bus_message_read_basic(property, type, &i);
 831                 if (r < 0)
 832                         return r;
 833
 834                 print_property(name, "%"PRIi32, i);
 835                 return 1;
 836         }
 837
 838         case SD_BUS_TYPE_DOUBLE: {
 839                 double d;
 840
 841                 r = sd_bus_message_read_basic(property, type, &d);
 842                 if (r < 0)
 843                         return r;
 844
 845                 print_property(name, "%g", d);
 846                 return 1;
 847         }
 848
 849         case SD_BUS_TYPE_ARRAY:
 850                 if (streq(contents, "s")) {
 851                         bool first = true;
 852                         const char *str;
 853
 854                         r = sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents);
 855                         if (r < 0)
 856                                 return r;
 857
 858                         while ((r = sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) > 0) {
 859                                 bool good;
 860
 861                                 if (first && !value)
 862                                         printf("%s=", name);
 863
 864                                 /* This property has multiple space-separated values, so
 865                                  * neither spaces not newlines can be allowed in a value. */
 866                                 good = str[strcspn(str, " \n")] == '\0';
 867
 868                                 printf("%s%s", first ? "" : " ", good ? str : "[unprintable]");
 869
 870                                 first = false;
 871                         }
 872                         if (r < 0)
 873                                 return r;
 874
 875                         if (first && all && !value)
 876                                 printf("%s=", name);
 877                         if (!first || all)
 878                                 puts("");
 879
 880                         r = sd_bus_message_exit_container(property);
 881                         if (r < 0)
 882                                 return r;
 883
 884                         return 1;
 885
 886                 } else if (streq(contents, "y")) {
 887                         const uint8_t *u;
 888                         size_t n;
 889
 890                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
 891                         if (r < 0)
 892                                 return r;
 893
 894                         if (all || n > 0) {
 895                                 unsigned int i;
 896
 897                                 if (!value)
 898                                         printf("%s=", name);
 899
 900                                 for (i = 0; i < n; i++)
 901                                         printf("%02x", u[i]);
 902
 903                                 puts("");
 904                         }
 905
 906                         return 1;
 907
 908                 } else if (streq(contents, "u")) {
 909                         uint32_t *u;
 910                         size_t n;
 911
 912                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
 913                         if (r < 0)
 914                                 return r;
 915
 916                         if (all || n > 0) {
 917                                 unsigned int i;
 918
 919                                 if (!value)
 920                                         printf("%s=", name);
 921
 922                                 for (i = 0; i < n; i++)
 923                                         printf("%08x", u[i]);
 924
 925                                 puts("");
 926                         }
 927
 928                         return 1;
 929                 }
 930
 931                 break;
 932         }
 933
 934         return 0;
 935 }
 936
 937 int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool value, bool all) {
 938         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 939         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 940         int r;
 941
 942         assert(bus);
 943         assert(path);
 944
 945         r = sd_bus_call_method(bus,
 946                         dest,
 947                         path,
 948                         "org.freedesktop.DBus.Properties",
 949                         "GetAll",
 950                         &error,
 951                         &reply,
 952                         "s", "");
 953         if (r < 0)
 954                 return r;
 955
 956         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
 957         if (r < 0)
 958                 return r;
 959
 960         while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
 961                 const char *name;
 962                 const char *contents;
 963
 964                 r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name);
 965                 if (r < 0)
 966                         return r;
 967
 968                 if (!filter || strv_find(filter, name)) {
 969                         r = sd_bus_message_peek_type(reply, NULL, &contents);
 970                         if (r < 0)
 971                                 return r;
 972
 973                         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
 974                         if (r < 0)
 975                                 return r;
 976
 977                         r = bus_print_property(name, reply, value, all);
 978                         if (r < 0)
 979                                 return r;
 980                         if (r == 0) {
 981                                 if (all)
 982                                         printf("%s=[unprintable]\n", name);
 983                                 /* skip what we didn't read */
 984                                 r = sd_bus_message_skip(reply, contents);
 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                 } else {
 993                         r = sd_bus_message_skip(reply, "v");
 994                         if (r < 0)
 995                                 return r;
 996                 }
 997
 998                 r = sd_bus_message_exit_container(reply);
 999                 if (r < 0)
1000                         return r;
1001         }
1002         if (r < 0)
1003                 return r;
1004
1005         r = sd_bus_message_exit_container(reply);
1006         if (r < 0)
1007                 return r;
1008
1009         return 0;
1010 }
1011
1012 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1013         sd_id128_t *p = userdata;
1014         const void *v;
1015         size_t n;
1016         int r;
1017
1018         r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
1019         if (r < 0)
1020                 return r;
1021
1022         if (n == 0)
1023                 *p = SD_ID128_NULL;
1024         else if (n == 16)
1025                 memcpy((*p).bytes, v, n);
1026         else
1027                 return -EINVAL;
1028
1029         return 0;
1030 }
1031
1032 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1033         char type;
1034         int r;
1035
1036         r = sd_bus_message_peek_type(m, &type, NULL);
1037         if (r < 0)
1038                 return r;
1039
1040         switch (type) {
1041
1042         case SD_BUS_TYPE_STRING: {
1043                 char **p = userdata;
1044                 const char *s;
1045
1046                 r = sd_bus_message_read_basic(m, type, &s);
1047                 if (r < 0)
1048                         return r;
1049
1050                 if (isempty(s))
1051                         s = NULL;
1052
1053                 return free_and_strdup(p, s);
1054         }
1055
1056         case SD_BUS_TYPE_ARRAY: {
1057                 _cleanup_strv_free_ char **l = NULL;
1058                 char ***p = userdata;
1059
1060                 r = bus_message_read_strv_extend(m, &l);
1061                 if (r < 0)
1062                         return r;
1063
1064                 strv_free(*p);
1065                 *p = l;
1066                 l = NULL;
1067                 return 0;
1068         }
1069
1070         case SD_BUS_TYPE_BOOLEAN: {
1071                 unsigned b;
1072                 int *p = userdata;
1073
1074                 r = sd_bus_message_read_basic(m, type, &b);
1075                 if (r < 0)
1076                         return r;
1077
1078                 *p = b;
1079                 return 0;
1080         }
1081
1082         case SD_BUS_TYPE_INT32:
1083         case SD_BUS_TYPE_UINT32: {
1084                 uint32_t u, *p = userdata;
1085
1086                 r = sd_bus_message_read_basic(m, type, &u);
1087                 if (r < 0)
1088                         return r;
1089
1090                 *p = u;
1091                 return 0;
1092         }
1093
1094         case SD_BUS_TYPE_INT64:
1095         case SD_BUS_TYPE_UINT64: {
1096                 uint64_t t, *p = userdata;
1097
1098                 r = sd_bus_message_read_basic(m, type, &t);
1099                 if (r < 0)
1100                         return r;
1101
1102                 *p = t;
1103                 return 0;
1104         }
1105
1106         case SD_BUS_TYPE_DOUBLE: {
1107                 double d, *p = userdata;
1108
1109                 r = sd_bus_message_read_basic(m, type, &d);
1110                 if (r < 0)
1111                         return r;
1112
1113                 *p = d;
1114                 return 0;
1115         }}
1116
1117         return -EOPNOTSUPP;
1118 }
1119
1120 int bus_message_map_all_properties(
1121                 sd_bus_message *m,
1122                 const struct bus_properties_map *map,
1123                 sd_bus_error *error,
1124                 void *userdata) {
1125
1126         int r;
1127
1128         assert(m);
1129         assert(map);
1130
1131         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
1132         if (r < 0)
1133                 return r;
1134
1135         while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
1136                 const struct bus_properties_map *prop;
1137                 const char *member;
1138                 const char *contents;
1139                 void *v;
1140                 unsigned i;
1141
1142                 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
1143                 if (r < 0)
1144                         return r;
1145
1146                 for (i = 0, prop = NULL; map[i].member; i++)
1147                         if (streq(map[i].member, member)) {
1148                                 prop = &map[i];
1149                                 break;
1150                         }
1151
1152                 if (prop) {
1153                         r = sd_bus_message_peek_type(m, NULL, &contents);
1154                         if (r < 0)
1155                                 return r;
1156
1157                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
1158                         if (r < 0)
1159                                 return r;
1160
1161                         v = (uint8_t *)userdata + prop->offset;
1162                         if (map[i].set)
1163                                 r = prop->set(sd_bus_message_get_bus(m), member, m, error, v);
1164                         else
1165                                 r = map_basic(sd_bus_message_get_bus(m), member, m, error, v);
1166                         if (r < 0)
1167                                 return r;
1168
1169                         r = sd_bus_message_exit_container(m);
1170                         if (r < 0)
1171                                 return r;
1172                 } else {
1173                         r = sd_bus_message_skip(m, "v");
1174                         if (r < 0)
1175                                 return r;
1176                 }
1177
1178                 r = sd_bus_message_exit_container(m);
1179                 if (r < 0)
1180                         return r;
1181         }
1182         if (r < 0)
1183                 return r;
1184
1185         return sd_bus_message_exit_container(m);
1186 }
1187
1188 #if 0 /// UNNEEDED by elogind
1189 int bus_message_map_properties_changed(
1190                 sd_bus_message *m,
1191                 const struct bus_properties_map *map,
1192                 sd_bus_error *error,
1193                 void *userdata) {
1194
1195         const char *member;
1196         int r, invalidated, i;
1197
1198         assert(m);
1199         assert(map);
1200
1201         r = bus_message_map_all_properties(m, map, error, userdata);
1202         if (r < 0)
1203                 return r;
1204
1205         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
1206         if (r < 0)
1207                 return r;
1208
1209         invalidated = 0;
1210         while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
1211                 for (i = 0; map[i].member; i++)
1212                         if (streq(map[i].member, member)) {
1213                                 ++invalidated;
1214                                 break;
1215                         }
1216         if (r < 0)
1217                 return r;
1218
1219         r = sd_bus_message_exit_container(m);
1220         if (r < 0)
1221                 return r;
1222
1223         return invalidated;
1224 }
1225 #endif // 0
1226
1227 int bus_map_all_properties(
1228                 sd_bus *bus,
1229                 const char *destination,
1230                 const char *path,
1231                 const struct bus_properties_map *map,
1232                 sd_bus_error *error,
1233                 void *userdata) {
1234
1235         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1236         int r;
1237
1238         assert(bus);
1239         assert(destination);
1240         assert(path);
1241         assert(map);
1242
1243         r = sd_bus_call_method(
1244                         bus,
1245                         destination,
1246                         path,
1247                         "org.freedesktop.DBus.Properties",
1248                         "GetAll",
1249                         error,
1250                         &m,
1251                         "s", "");
1252         if (r < 0)
1253                 return r;
1254
1255         return bus_message_map_all_properties(m, map, error, userdata);
1256 }
1257
1258 int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **ret) {
1259         _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL;
1260         int r;
1261
1262         assert(transport >= 0);
1263         assert(transport < _BUS_TRANSPORT_MAX);
1264         assert(ret);
1265
1266         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1267         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1268
1269         switch (transport) {
1270
1271         case BUS_TRANSPORT_LOCAL:
1272 #if 0 /// elogind does not support a user bus
1273                 if (user)
1274                         r = sd_bus_default_user(&bus);
1275                 else
1276 #endif // 0
1277                         r = sd_bus_default_system(&bus);
1278
1279                 break;
1280
1281         case BUS_TRANSPORT_REMOTE:
1282                 r = sd_bus_open_system_remote(&bus, host);
1283                 break;
1284
1285         case BUS_TRANSPORT_MACHINE:
1286                 r = sd_bus_open_system_machine(&bus, host);
1287                 break;
1288
1289         default:
1290                 assert_not_reached("Hmm, unknown transport type.");
1291         }
1292         if (r < 0)
1293                 return r;
1294
1295         r = sd_bus_set_exit_on_disconnect(bus, true);
1296         if (r < 0)
1297                 return r;
1298
1299         *ret = bus;
1300         bus = NULL;
1301
1302         return 0;
1303 }
1304
1305 #if 0 /// UNNEEDED by elogind
1306 int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1307         int r;
1308
1309         assert(transport >= 0);
1310         assert(transport < _BUS_TRANSPORT_MAX);
1311         assert(bus);
1312
1313         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1314         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1315
1316         switch (transport) {
1317
1318         case BUS_TRANSPORT_LOCAL:
1319                 if (user)
1320                         r = bus_connect_user_systemd(bus);
1321                 else
1322                         r = bus_connect_system_systemd(bus);
1323
1324                 break;
1325
1326         case BUS_TRANSPORT_REMOTE:
1327                 r = sd_bus_open_system_remote(bus, host);
1328                 break;
1329
1330         case BUS_TRANSPORT_MACHINE:
1331                 r = sd_bus_open_system_machine(bus, host);
1332                 break;
1333
1334         default:
1335                 assert_not_reached("Hmm, unknown transport type.");
1336         }
1337
1338         return r;
1339 }
1340 #endif // 0
1341
1342 int bus_property_get_bool(
1343                 sd_bus *bus,
1344                 const char *path,
1345                 const char *interface,
1346                 const char *property,
1347                 sd_bus_message *reply,
1348                 void *userdata,
1349                 sd_bus_error *error) {
1350
1351         int b = *(bool*) userdata;
1352
1353         return sd_bus_message_append_basic(reply, 'b', &b);
1354 }
1355
1356 #if 0 /// UNNEEDED by elogind
1357 int bus_property_get_id128(
1358                 sd_bus *bus,
1359                 const char *path,
1360                 const char *interface,
1361                 const char *property,
1362                 sd_bus_message *reply,
1363                 void *userdata,
1364                 sd_bus_error *error) {
1365
1366         sd_id128_t *id = userdata;
1367
1368         if (sd_id128_is_null(*id)) /* Add an empty array if the ID is zero */
1369                 return sd_bus_message_append(reply, "ay", 0);
1370         else
1371                 return sd_bus_message_append_array(reply, 'y', id->bytes, 16);
1372 }
1373 #endif // 0
1374
1375 #if __SIZEOF_SIZE_T__ != 8
1376 int bus_property_get_size(
1377                 sd_bus *bus,
1378                 const char *path,
1379                 const char *interface,
1380                 const char *property,
1381                 sd_bus_message *reply,
1382                 void *userdata,
1383                 sd_bus_error *error) {
1384
1385         uint64_t sz = *(size_t*) userdata;
1386
1387         return sd_bus_message_append_basic(reply, 't', &sz);
1388 }
1389 #endif
1390
1391 #if __SIZEOF_LONG__ != 8
1392 int bus_property_get_long(
1393                 sd_bus *bus,
1394                 const char *path,
1395                 const char *interface,
1396                 const char *property,
1397                 sd_bus_message *reply,
1398                 void *userdata,
1399                 sd_bus_error *error) {
1400
1401         int64_t l = *(long*) userdata;
1402
1403         return sd_bus_message_append_basic(reply, 'x', &l);
1404 }
1405
1406 int bus_property_get_ulong(
1407                 sd_bus *bus,
1408                 const char *path,
1409                 const char *interface,
1410                 const char *property,
1411                 sd_bus_message *reply,
1412                 void *userdata,
1413                 sd_bus_error *error) {
1414
1415         uint64_t ul = *(unsigned long*) userdata;
1416
1417         return sd_bus_message_append_basic(reply, 't', &ul);
1418 }
1419 #endif
1420
1421 int bus_log_parse_error(int r) {
1422         return log_error_errno(r, "Failed to parse bus message: %m");
1423 }
1424
1425 #if 0 /// UNNEEDED by elogind
1426 int bus_log_create_error(int r) {
1427         return log_error_errno(r, "Failed to create bus message: %m");
1428 }
1429
1430 #endif // 0
1431 #if 0 /// UNNEEDED by elogind
1432 /**
1433  * bus_path_encode_unique() - encode unique object path
1434  * @b: bus connection or NULL
1435  * @prefix: object path prefix
1436  * @sender_id: unique-name of client, or NULL
1437  * @external_id: external ID to be chosen by client, or NULL
1438  * @ret_path: storage for encoded object path pointer
1439  *
1440  * Whenever we provide a bus API that allows clients to create and manage
1441  * server-side objects, we need to provide a unique name for these objects. If
1442  * we let the server choose the name, we suffer from a race condition: If a
1443  * client creates an object asynchronously, it cannot destroy that object until
1444  * it received the method reply. It cannot know the name of the new object,
1445  * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
1446  *
1447  * Therefore, many APIs allow the client to choose the unique name for newly
1448  * created objects. There're two problems to solve, though:
1449  *    1) Object names are usually defined via dbus object paths, which are
1450  *       usually globally namespaced. Therefore, multiple clients must be able
1451  *       to choose unique object names without interference.
1452  *    2) If multiple libraries share the same bus connection, they must be
1453  *       able to choose unique object names without interference.
1454  * The first problem is solved easily by prefixing a name with the
1455  * unique-bus-name of a connection. The server side must enforce this and
1456  * reject any other name. The second problem is solved by providing unique
1457  * suffixes from within sd-bus.
1458  *
1459  * This helper allows clients to create unique object-paths. It uses the
1460  * template '/prefix/sender_id/external_id' and returns the new path in
1461  * @ret_path (must be freed by the caller).
1462  * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
1463  * NULL, this function allocates a unique suffix via @b (by requesting a new
1464  * cookie). If both @sender_id and @external_id are given, @b can be passed as
1465  * NULL.
1466  *
1467  * Returns: 0 on success, negative error code on failure.
1468  */
1469 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
1470         _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
1471         char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
1472         int r;
1473
1474         assert_return(b || (sender_id && external_id), -EINVAL);
1475         assert_return(object_path_is_valid(prefix), -EINVAL);
1476         assert_return(ret_path, -EINVAL);
1477
1478         if (!sender_id) {
1479                 r = sd_bus_get_unique_name(b, &sender_id);
1480                 if (r < 0)
1481                         return r;
1482         }
1483
1484         if (!external_id) {
1485                 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
1486                 external_id = external_buf;
1487         }
1488
1489         sender_label = bus_label_escape(sender_id);
1490         if (!sender_label)
1491                 return -ENOMEM;
1492
1493         external_label = bus_label_escape(external_id);
1494         if (!external_label)
1495                 return -ENOMEM;
1496
1497         p = strjoin(prefix, "/", sender_label, "/", external_label);
1498         if (!p)
1499                 return -ENOMEM;
1500
1501         *ret_path = p;
1502         return 0;
1503 }
1504
1505 /**
1506  * bus_path_decode_unique() - decode unique object path
1507  * @path: object path to decode
1508  * @prefix: object path prefix
1509  * @ret_sender: output parameter for sender-id label
1510  * @ret_external: output parameter for external-id label
1511  *
1512  * This does the reverse of bus_path_encode_unique() (see its description for
1513  * details). Both trailing labels, sender-id and external-id, are unescaped and
1514  * returned in the given output parameters (the caller must free them).
1515  *
1516  * Note that this function returns 0 if the path does not match the template
1517  * (see bus_path_encode_unique()), 1 if it matched.
1518  *
1519  * Returns: Negative error code on failure, 0 if the given object path does not
1520  *          match the template (return parameters are set to NULL), 1 if it was
1521  *          parsed successfully (return parameters contain allocated labels).
1522  */
1523 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
1524         const char *p, *q;
1525         char *sender, *external;
1526
1527         assert(object_path_is_valid(path));
1528         assert(object_path_is_valid(prefix));
1529         assert(ret_sender);
1530         assert(ret_external);
1531
1532         p = object_path_startswith(path, prefix);
1533         if (!p) {
1534                 *ret_sender = NULL;
1535                 *ret_external = NULL;
1536                 return 0;
1537         }
1538
1539         q = strchr(p, '/');
1540         if (!q) {
1541                 *ret_sender = NULL;
1542                 *ret_external = NULL;
1543                 return 0;
1544         }
1545
1546         sender = bus_label_unescape_n(p, q - p);
1547         external = bus_label_unescape(q + 1);
1548         if (!sender || !external) {
1549                 free(sender);
1550                 free(external);
1551                 return -ENOMEM;
1552         }
1553
1554         *ret_sender = sender;
1555         *ret_external = external;
1556         return 1;
1557 }
1558 #endif // 0
1559
1560 #if 0 /// UNNEEDED by elogind
1561 int bus_property_get_rlimit(
1562                 sd_bus *bus,
1563                 const char *path,
1564                 const char *interface,
1565                 const char *property,
1566                 sd_bus_message *reply,
1567                 void *userdata,
1568                 sd_bus_error *error) {
1569
1570         struct rlimit *rl;
1571         uint64_t u;
1572         rlim_t x;
1573         const char *is_soft;
1574
1575         assert(bus);
1576         assert(reply);
1577         assert(userdata);
1578
1579         is_soft = endswith(property, "Soft");
1580         rl = *(struct rlimit**) userdata;
1581         if (rl)
1582                 x = is_soft ? rl->rlim_cur : rl->rlim_max;
1583         else {
1584                 struct rlimit buf = {};
1585                 int z;
1586                 const char *s;
1587
1588                 s = is_soft ? strndupa(property, is_soft - property) : property;
1589
1590                 z = rlimit_from_string(strstr(s, "Limit"));
1591                 assert(z >= 0);
1592
1593                 getrlimit(z, &buf);
1594                 x = is_soft ? buf.rlim_cur : buf.rlim_max;
1595         }
1596
1597         /* rlim_t might have different sizes, let's map
1598          * RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on
1599          * all archs */
1600         u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
1601
1602         return sd_bus_message_append(reply, "t", u);
1603 }
1604
1605 int bus_track_add_name_many(sd_bus_track *t, char **l) {
1606         int r = 0;
1607         char **i;
1608
1609         assert(t);
1610
1611         /* Continues adding after failure, and returns the first failure. */
1612
1613         STRV_FOREACH(i, l) {
1614                 int k;
1615
1616                 k = sd_bus_track_add_name(t, *i);
1617                 if (k < 0 && r >= 0)
1618                         r = k;
1619         }
1620
1621         return r;
1622 }
1623 #endif // 0