src/shared/bus-util.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/socket.h>
  23
  24 #include "sd-bus.h"
  25 #include "sd-daemon.h"
  26 #include "sd-event.h"
  27
  28 #include "alloc-util.h"
  29 #include "bus-error.h"
  30 #include "bus-internal.h"
  31 #include "bus-label.h"
  32 #include "bus-message.h"
  33 #include "bus-util.h"
  34 #include "cgroup-util.h"
  35 #include "def.h"
  36 //#include "env-util.h"
  37 #include "escape.h"
  38 #include "fd-util.h"
  39 #include "macro.h"
  40 #include "missing.h"
  41 #include "parse-util.h"
  42 #include "path-util.h"
  43 #include "proc-cmdline.h"
  44 #include "process-util.h"
  45 //#include "rlimit-util.h"
  46 #include "set.h"
  47 #include "signal-util.h"
  48 #include "stdio-util.h"
  49 #include "string-util.h"
  50 #include "strv.h"
  51 #include "syslog-util.h"
  52 #include "unit-name.h"
  53 #include "user-util.h"
  54 #include "utf8.h"
  55 #include "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_bus_message_unref_ 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_bus_creds_unref_ 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 #ifdef ENABLE_POLKIT
 261         else {
 262                 _cleanup_bus_message_unref_ sd_bus_message *request = NULL;
 263                 _cleanup_bus_message_unref_ 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 #ifdef 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_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 #ifdef ENABLE_POLKIT
 404         _cleanup_bus_message_unref_ 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 #ifdef 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 #ifdef 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 #ifdef ENABLE_POLKIT
 558         AsyncPolkitQuery *q;
 559
 560         while ((q = hashmap_steal_first(registry)))
 561                 async_polkit_query_free(q);
 562
 563         hashmap_free(registry);
 564 #endif
 565 }
 566
 567 #if 0 /// UNNEEDED by elogind
 568 int bus_check_peercred(sd_bus *c) {
 569         struct ucred ucred;
 570         socklen_t l;
 571         int fd;
 572
 573         assert(c);
 574
 575         fd = sd_bus_get_fd(c);
 576         if (fd < 0)
 577                 return fd;
 578
 579         l = sizeof(struct ucred);
 580         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
 581                 return -errno;
 582
 583         if (l != sizeof(struct ucred))
 584                 return -E2BIG;
 585
 586         if (ucred.uid != 0 && ucred.uid != geteuid())
 587                 return -EPERM;
 588
 589         return 1;
 590 }
 591
 592 int bus_connect_system_systemd(sd_bus **_bus) {
 593         _cleanup_bus_unref_ sd_bus *bus = NULL;
 594         int r;
 595
 596         assert(_bus);
 597
 598         if (geteuid() != 0)
 599                 return sd_bus_default_system(_bus);
 600
 601         /* If we are root and kdbus is not available, then let's talk
 602          * directly to the system instance, instead of going via the
 603          * bus */
 604
 605         r = sd_bus_new(&bus);
 606         if (r < 0)
 607                 return r;
 608
 609         r = sd_bus_set_address(bus, KERNEL_SYSTEM_BUS_ADDRESS);
 610         if (r < 0)
 611                 return r;
 612
 613         bus->bus_client = true;
 614
 615         r = sd_bus_start(bus);
 616         if (r >= 0) {
 617                 *_bus = bus;
 618                 bus = NULL;
 619                 return 0;
 620         }
 621
 622         bus = sd_bus_unref(bus);
 623
 624         r = sd_bus_new(&bus);
 625         if (r < 0)
 626                 return r;
 627
 628         r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
 629         if (r < 0)
 630                 return r;
 631
 632         r = sd_bus_start(bus);
 633         if (r < 0)
 634                 return sd_bus_default_system(_bus);
 635
 636         r = bus_check_peercred(bus);
 637         if (r < 0)
 638                 return r;
 639
 640         *_bus = bus;
 641         bus = NULL;
 642
 643         return 0;
 644 }
 645
 646 int bus_connect_user_systemd(sd_bus **_bus) {
 647         _cleanup_bus_unref_ sd_bus *bus = NULL;
 648         _cleanup_free_ char *ee = NULL;
 649         const char *e;
 650         int r;
 651
 652         /* Try via kdbus first, and then directly */
 653
 654         assert(_bus);
 655
 656         r = sd_bus_new(&bus);
 657         if (r < 0)
 658                 return r;
 659
 660         if (asprintf(&bus->address, KERNEL_USER_BUS_ADDRESS_FMT, getuid()) < 0)
 661                 return -ENOMEM;
 662
 663         bus->bus_client = true;
 664
 665         r = sd_bus_start(bus);
 666         if (r >= 0) {
 667                 *_bus = bus;
 668                 bus = NULL;
 669                 return 0;
 670         }
 671
 672         bus = sd_bus_unref(bus);
 673
 674         e = secure_getenv("XDG_RUNTIME_DIR");
 675         if (!e)
 676                 return sd_bus_default_user(_bus);
 677
 678         ee = bus_address_escape(e);
 679         if (!ee)
 680                 return -ENOMEM;
 681
 682         r = sd_bus_new(&bus);
 683         if (r < 0)
 684                 return r;
 685
 686         bus->address = strjoin("unix:path=", ee, "/systemd/private", NULL);
 687         if (!bus->address)
 688                 return -ENOMEM;
 689
 690         r = sd_bus_start(bus);
 691         if (r < 0)
 692                 return sd_bus_default_user(_bus);
 693
 694         r = bus_check_peercred(bus);
 695         if (r < 0)
 696                 return r;
 697
 698         *_bus = bus;
 699         bus = NULL;
 700
 701         return 0;
 702 }
 703 #endif // 0
 704
 705 int bus_print_property(const char *name, sd_bus_message *property, bool all) {
 706         char type;
 707         const char *contents;
 708         int r;
 709
 710         assert(name);
 711         assert(property);
 712
 713         r = sd_bus_message_peek_type(property, &type, &contents);
 714         if (r < 0)
 715                 return r;
 716
 717         switch (type) {
 718
 719         case SD_BUS_TYPE_STRING: {
 720                 const char *s;
 721
 722                 r = sd_bus_message_read_basic(property, type, &s);
 723                 if (r < 0)
 724                         return r;
 725
 726                 if (all || !isempty(s)) {
 727                         _cleanup_free_ char *escaped = NULL;
 728
 729                         escaped = xescape(s, "\n");
 730                         if (!escaped)
 731                                 return -ENOMEM;
 732
 733                         printf("%s=%s\n", name, escaped);
 734                 }
 735
 736                 return 1;
 737         }
 738
 739         case SD_BUS_TYPE_BOOLEAN: {
 740                 int b;
 741
 742                 r = sd_bus_message_read_basic(property, type, &b);
 743                 if (r < 0)
 744                         return r;
 745
 746                 printf("%s=%s\n", name, yes_no(b));
 747
 748                 return 1;
 749         }
 750
 751         case SD_BUS_TYPE_UINT64: {
 752                 uint64_t u;
 753
 754                 r = sd_bus_message_read_basic(property, type, &u);
 755                 if (r < 0)
 756                         return r;
 757
 758                 /* Yes, heuristics! But we can change this check
 759                  * should it turn out to not be sufficient */
 760
 761                 if (endswith(name, "Timestamp")) {
 762                         char timestamp[FORMAT_TIMESTAMP_MAX], *t;
 763
 764                         t = format_timestamp(timestamp, sizeof(timestamp), u);
 765                         if (t || all)
 766                                 printf("%s=%s\n", name, strempty(t));
 767
 768                 } else if (strstr(name, "USec")) {
 769                         char timespan[FORMAT_TIMESPAN_MAX];
 770
 771                         printf("%s=%s\n", name, format_timespan(timespan, sizeof(timespan), u, 0));
 772                 } else
 773                         printf("%s=%llu\n", name, (unsigned long long) u);
 774
 775                 return 1;
 776         }
 777
 778         case SD_BUS_TYPE_INT64: {
 779                 int64_t i;
 780
 781                 r = sd_bus_message_read_basic(property, type, &i);
 782                 if (r < 0)
 783                         return r;
 784
 785                 printf("%s=%lld\n", name, (long long) i);
 786
 787                 return 1;
 788         }
 789
 790         case SD_BUS_TYPE_UINT32: {
 791                 uint32_t u;
 792
 793                 r = sd_bus_message_read_basic(property, type, &u);
 794                 if (r < 0)
 795                         return r;
 796
 797                 if (strstr(name, "UMask") || strstr(name, "Mode"))
 798                         printf("%s=%04o\n", name, u);
 799                 else
 800                         printf("%s=%u\n", name, (unsigned) u);
 801
 802                 return 1;
 803         }
 804
 805         case SD_BUS_TYPE_INT32: {
 806                 int32_t i;
 807
 808                 r = sd_bus_message_read_basic(property, type, &i);
 809                 if (r < 0)
 810                         return r;
 811
 812                 printf("%s=%i\n", name, (int) i);
 813                 return 1;
 814         }
 815
 816         case SD_BUS_TYPE_DOUBLE: {
 817                 double d;
 818
 819                 r = sd_bus_message_read_basic(property, type, &d);
 820                 if (r < 0)
 821                         return r;
 822
 823                 printf("%s=%g\n", name, d);
 824                 return 1;
 825         }
 826
 827         case SD_BUS_TYPE_ARRAY:
 828                 if (streq(contents, "s")) {
 829                         bool first = true;
 830                         const char *str;
 831
 832                         r = sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents);
 833                         if (r < 0)
 834                                 return r;
 835
 836                         while((r = sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) > 0) {
 837                                 _cleanup_free_ char *escaped = NULL;
 838
 839                                 if (first)
 840                                         printf("%s=", name);
 841
 842                                 escaped = xescape(str, "\n ");
 843                                 if (!escaped)
 844                                         return -ENOMEM;
 845
 846                                 printf("%s%s", first ? "" : " ", escaped);
 847
 848                                 first = false;
 849                         }
 850                         if (r < 0)
 851                                 return r;
 852
 853                         if (first && all)
 854                                 printf("%s=", name);
 855                         if (!first || all)
 856                                 puts("");
 857
 858                         r = sd_bus_message_exit_container(property);
 859                         if (r < 0)
 860                                 return r;
 861
 862                         return 1;
 863
 864                 } else if (streq(contents, "y")) {
 865                         const uint8_t *u;
 866                         size_t n;
 867
 868                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_BYTE, (const void**) &u, &n);
 869                         if (r < 0)
 870                                 return r;
 871
 872                         if (all || n > 0) {
 873                                 unsigned int i;
 874
 875                                 printf("%s=", name);
 876
 877                                 for (i = 0; i < n; i++)
 878                                         printf("%02x", u[i]);
 879
 880                                 puts("");
 881                         }
 882
 883                         return 1;
 884
 885                 } else if (streq(contents, "u")) {
 886                         uint32_t *u;
 887                         size_t n;
 888
 889                         r = sd_bus_message_read_array(property, SD_BUS_TYPE_UINT32, (const void**) &u, &n);
 890                         if (r < 0)
 891                                 return r;
 892
 893                         if (all || n > 0) {
 894                                 unsigned int i;
 895
 896                                 printf("%s=", name);
 897
 898                                 for (i = 0; i < n; i++)
 899                                         printf("%08x", u[i]);
 900
 901                                 puts("");
 902                         }
 903
 904                         return 1;
 905                 }
 906
 907                 break;
 908         }
 909
 910         return 0;
 911 }
 912
 913 int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool all) {
 914         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
 915         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
 916         int r;
 917
 918         assert(bus);
 919         assert(path);
 920
 921         r = sd_bus_call_method(bus,
 922                         dest,
 923                         path,
 924                         "org.freedesktop.DBus.Properties",
 925                         "GetAll",
 926                         &error,
 927                         &reply,
 928                         "s", "");
 929         if (r < 0)
 930                 return r;
 931
 932         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
 933         if (r < 0)
 934                 return r;
 935
 936         while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
 937                 const char *name;
 938                 const char *contents;
 939
 940                 r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name);
 941                 if (r < 0)
 942                         return r;
 943
 944                 if (!filter || strv_find(filter, name)) {
 945                         r = sd_bus_message_peek_type(reply, NULL, &contents);
 946                         if (r < 0)
 947                                 return r;
 948
 949                         r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
 950                         if (r < 0)
 951                                 return r;
 952
 953                         r = bus_print_property(name, reply, all);
 954                         if (r < 0)
 955                                 return r;
 956                         if (r == 0) {
 957                                 if (all)
 958                                         printf("%s=[unprintable]\n", name);
 959                                 /* skip what we didn't read */
 960                                 r = sd_bus_message_skip(reply, contents);
 961                                 if (r < 0)
 962                                         return r;
 963                         }
 964
 965                         r = sd_bus_message_exit_container(reply);
 966                         if (r < 0)
 967                                 return r;
 968                 } else {
 969                         r = sd_bus_message_skip(reply, "v");
 970                         if (r < 0)
 971                                 return r;
 972                 }
 973
 974                 r = sd_bus_message_exit_container(reply);
 975                 if (r < 0)
 976                         return r;
 977         }
 978         if (r < 0)
 979                 return r;
 980
 981         r = sd_bus_message_exit_container(reply);
 982         if (r < 0)
 983                 return r;
 984
 985         return 0;
 986 }
 987
 988 int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
 989         sd_id128_t *p = userdata;
 990         const void *v;
 991         size_t n;
 992         int r;
 993
 994         r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n);
 995         if (r < 0)
 996                 return r;
 997
 998         if (n == 0)
 999                 *p = SD_ID128_NULL;
1000         else if (n == 16)
1001                 memcpy((*p).bytes, v, n);
1002         else
1003                 return -EINVAL;
1004
1005         return 0;
1006 }
1007
1008 static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
1009         char type;
1010         int r;
1011
1012         r = sd_bus_message_peek_type(m, &type, NULL);
1013         if (r < 0)
1014                 return r;
1015
1016         switch (type) {
1017         case SD_BUS_TYPE_STRING: {
1018                 const char *s;
1019                 char **p = userdata;
1020
1021                 r = sd_bus_message_read_basic(m, type, &s);
1022                 if (r < 0)
1023                         break;
1024
1025                 if (isempty(s))
1026                         break;
1027
1028                 r = free_and_strdup(p, s);
1029                 break;
1030         }
1031
1032         case SD_BUS_TYPE_ARRAY: {
1033                _cleanup_strv_free_ char **l = NULL;
1034                char ***p = userdata;
1035
1036                 r = bus_message_read_strv_extend(m, &l);
1037                 if (r < 0)
1038                         break;
1039
1040                 strv_free(*p);
1041                 *p = l;
1042                 l = NULL;
1043
1044                 break;
1045         }
1046
1047         case SD_BUS_TYPE_BOOLEAN: {
1048                 unsigned b;
1049                 bool *p = userdata;
1050
1051                 r = sd_bus_message_read_basic(m, type, &b);
1052                 if (r < 0)
1053                         break;
1054
1055                 *p = b;
1056
1057                 break;
1058         }
1059
1060         case SD_BUS_TYPE_UINT32: {
1061                 uint64_t u;
1062                 uint32_t *p = userdata;
1063
1064                 r = sd_bus_message_read_basic(m, type, &u);
1065                 if (r < 0)
1066                         break;
1067
1068                 *p = u;
1069
1070                 break;
1071         }
1072
1073         case SD_BUS_TYPE_UINT64: {
1074                 uint64_t t;
1075                 uint64_t *p = userdata;
1076
1077                 r = sd_bus_message_read_basic(m, type, &t);
1078                 if (r < 0)
1079                         break;
1080
1081                 *p = t;
1082
1083                 break;
1084         }
1085
1086         default:
1087                 break;
1088         }
1089
1090         return r;
1091 }
1092
1093 int bus_message_map_all_properties(
1094                 sd_bus_message *m,
1095                 const struct bus_properties_map *map,
1096                 void *userdata) {
1097
1098         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1099         int r;
1100
1101         assert(m);
1102         assert(map);
1103
1104         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
1105         if (r < 0)
1106                 return r;
1107
1108         while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
1109                 const struct bus_properties_map *prop;
1110                 const char *member;
1111                 const char *contents;
1112                 void *v;
1113                 unsigned i;
1114
1115                 r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
1116                 if (r < 0)
1117                         return r;
1118
1119                 for (i = 0, prop = NULL; map[i].member; i++)
1120                         if (streq(map[i].member, member)) {
1121                                 prop = &map[i];
1122                                 break;
1123                         }
1124
1125                 if (prop) {
1126                         r = sd_bus_message_peek_type(m, NULL, &contents);
1127                         if (r < 0)
1128                                 return r;
1129
1130                         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
1131                         if (r < 0)
1132                                 return r;
1133
1134                         v = (uint8_t *)userdata + prop->offset;
1135                         if (map[i].set)
1136                                 r = prop->set(sd_bus_message_get_bus(m), member, m, &error, v);
1137                         else
1138                                 r = map_basic(sd_bus_message_get_bus(m), member, m, &error, v);
1139                         if (r < 0)
1140                                 return r;
1141
1142                         r = sd_bus_message_exit_container(m);
1143                         if (r < 0)
1144                                 return r;
1145                 } else {
1146                         r = sd_bus_message_skip(m, "v");
1147                         if (r < 0)
1148                                 return r;
1149                 }
1150
1151                 r = sd_bus_message_exit_container(m);
1152                 if (r < 0)
1153                         return r;
1154         }
1155         if (r < 0)
1156                 return r;
1157
1158         return sd_bus_message_exit_container(m);
1159 }
1160
1161 #if 0 /// UNNEEDED by elogind
1162 int bus_message_map_properties_changed(
1163                 sd_bus_message *m,
1164                 const struct bus_properties_map *map,
1165                 void *userdata) {
1166
1167         const char *member;
1168         int r, invalidated, i;
1169
1170         assert(m);
1171         assert(map);
1172
1173         r = bus_message_map_all_properties(m, map, userdata);
1174         if (r < 0)
1175                 return r;
1176
1177         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s");
1178         if (r < 0)
1179                 return r;
1180
1181         invalidated = 0;
1182         while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0)
1183                 for (i = 0; map[i].member; i++)
1184                         if (streq(map[i].member, member)) {
1185                                 ++invalidated;
1186                                 break;
1187                         }
1188         if (r < 0)
1189                 return r;
1190
1191         r = sd_bus_message_exit_container(m);
1192         if (r < 0)
1193                 return r;
1194
1195         return invalidated;
1196 }
1197 #endif // 0
1198
1199 int bus_map_all_properties(
1200                 sd_bus *bus,
1201                 const char *destination,
1202                 const char *path,
1203                 const struct bus_properties_map *map,
1204                 void *userdata) {
1205
1206         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
1207         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
1208         int r;
1209
1210         assert(bus);
1211         assert(destination);
1212         assert(path);
1213         assert(map);
1214
1215         r = sd_bus_call_method(
1216                         bus,
1217                         destination,
1218                         path,
1219                         "org.freedesktop.DBus.Properties",
1220                         "GetAll",
1221                         &error,
1222                         &m,
1223                         "s", "");
1224         if (r < 0)
1225                 return r;
1226
1227         return bus_message_map_all_properties(m, map, userdata);
1228 }
1229
1230 int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1231         int r;
1232
1233         assert(transport >= 0);
1234         assert(transport < _BUS_TRANSPORT_MAX);
1235         assert(bus);
1236
1237         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1238         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1239
1240         switch (transport) {
1241
1242         case BUS_TRANSPORT_LOCAL:
1243 #if 0 /// elogind does not support a user bus
1244                 if (user)
1245                         r = sd_bus_default_user(bus);
1246                 else
1247 #endif // 0
1248                         r = sd_bus_default_system(bus);
1249
1250                 break;
1251
1252         case BUS_TRANSPORT_REMOTE:
1253                 r = sd_bus_open_system_remote(bus, host);
1254                 break;
1255
1256         case BUS_TRANSPORT_MACHINE:
1257                 r = sd_bus_open_system_machine(bus, host);
1258                 break;
1259
1260         default:
1261                 assert_not_reached("Hmm, unknown transport type.");
1262         }
1263
1264         return r;
1265 }
1266
1267 #if 0 /// UNNEEDED by elogind
1268 int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) {
1269         int r;
1270
1271         assert(transport >= 0);
1272         assert(transport < _BUS_TRANSPORT_MAX);
1273         assert(bus);
1274
1275         assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL);
1276         assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP);
1277
1278         switch (transport) {
1279
1280         case BUS_TRANSPORT_LOCAL:
1281                 if (user)
1282                         r = bus_connect_user_systemd(bus);
1283                 else
1284                         r = bus_connect_system_systemd(bus);
1285
1286                 break;
1287
1288         case BUS_TRANSPORT_REMOTE:
1289                 r = sd_bus_open_system_remote(bus, host);
1290                 break;
1291
1292         case BUS_TRANSPORT_MACHINE:
1293                 r = sd_bus_open_system_machine(bus, host);
1294                 break;
1295
1296         default:
1297                 assert_not_reached("Hmm, unknown transport type.");
1298         }
1299
1300         return r;
1301 }
1302 #endif // 0
1303
1304 int bus_property_get_bool(
1305                 sd_bus *bus,
1306                 const char *path,
1307                 const char *interface,
1308                 const char *property,
1309                 sd_bus_message *reply,
1310                 void *userdata,
1311                 sd_bus_error *error) {
1312
1313         int b = *(bool*) userdata;
1314
1315         return sd_bus_message_append_basic(reply, 'b', &b);
1316 }
1317
1318 #if __SIZEOF_SIZE_T__ != 8
1319 int bus_property_get_size(
1320                 sd_bus *bus,
1321                 const char *path,
1322                 const char *interface,
1323                 const char *property,
1324                 sd_bus_message *reply,
1325                 void *userdata,
1326                 sd_bus_error *error) {
1327
1328         uint64_t sz = *(size_t*) userdata;
1329
1330         return sd_bus_message_append_basic(reply, 't', &sz);
1331 }
1332 #endif
1333
1334 #if __SIZEOF_LONG__ != 8
1335 int bus_property_get_long(
1336                 sd_bus *bus,
1337                 const char *path,
1338                 const char *interface,
1339                 const char *property,
1340                 sd_bus_message *reply,
1341                 void *userdata,
1342                 sd_bus_error *error) {
1343
1344         int64_t l = *(long*) userdata;
1345
1346         return sd_bus_message_append_basic(reply, 'x', &l);
1347 }
1348
1349 int bus_property_get_ulong(
1350                 sd_bus *bus,
1351                 const char *path,
1352                 const char *interface,
1353                 const char *property,
1354                 sd_bus_message *reply,
1355                 void *userdata,
1356                 sd_bus_error *error) {
1357
1358         uint64_t ul = *(unsigned long*) userdata;
1359
1360         return sd_bus_message_append_basic(reply, 't', &ul);
1361 }
1362 #endif
1363
1364 int bus_log_parse_error(int r) {
1365         return log_error_errno(r, "Failed to parse bus message: %m");
1366 }
1367
1368 #if 0 /// UNNEEDED by elogind
1369 int bus_log_create_error(int r) {
1370         return log_error_errno(r, "Failed to create bus message: %m");
1371 }
1372
1373 int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u) {
1374         assert(message);
1375         assert(u);
1376
1377         u->machine = NULL;
1378
1379         return sd_bus_message_read(
1380                         message,
1381                         "(ssssssouso)",
1382                         &u->id,
1383                         &u->description,
1384                         &u->load_state,
1385                         &u->active_state,
1386                         &u->sub_state,
1387                         &u->following,
1388                         &u->unit_path,
1389                         &u->job_id,
1390                         &u->job_type,
1391                         &u->job_path);
1392 }
1393
1394 int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignment) {
1395         const char *eq, *field;
1396         int r;
1397
1398         assert(m);
1399         assert(assignment);
1400
1401         eq = strchr(assignment, '=');
1402         if (!eq) {
1403                 log_error("Not an assignment: %s", assignment);
1404                 return -EINVAL;
1405         }
1406
1407         field = strndupa(assignment, eq - assignment);
1408         eq ++;
1409
1410         if (streq(field, "CPUQuota")) {
1411
1412                 if (isempty(eq)) {
1413
1414                         r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, "CPUQuotaPerSecUSec");
1415                         if (r < 0)
1416                                 return bus_log_create_error(r);
1417
1418                         r = sd_bus_message_append(m, "v", "t", USEC_INFINITY);
1419
1420                 } else if (endswith(eq, "%")) {
1421                         double percent;
1422
1423                         if (sscanf(eq, "%lf%%", &percent) != 1 || percent <= 0) {
1424                                 log_error("CPU quota '%s' invalid.", eq);
1425                                 return -EINVAL;
1426                         }
1427
1428                         r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, "CPUQuotaPerSecUSec");
1429                         if (r < 0)
1430                                 return bus_log_create_error(r);
1431
1432                         r = sd_bus_message_append(m, "v", "t", (usec_t) percent * USEC_PER_SEC / 100);
1433                 } else {
1434                         log_error("CPU quota needs to be in percent.");
1435                         return -EINVAL;
1436                 }
1437
1438                 if (r < 0)
1439                         return bus_log_create_error(r);
1440
1441                 return 0;
1442         } else if (streq(field, "EnvironmentFile")) {
1443                 r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, "EnvironmentFiles");
1444                 if (r < 0)
1445                         return r;
1446
1447                 r = sd_bus_message_append(m, "v", "a(sb)", 1,
1448                                           eq[0] == '-' ? eq + 1 : eq,
1449                                           eq[0] == '-');
1450                 if (r < 0)
1451                         return r;
1452                 return 0;
1453         }
1454
1455         r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, field);
1456         if (r < 0)
1457                 return bus_log_create_error(r);
1458
1459         if (STR_IN_SET(field,
1460                        "CPUAccounting", "MemoryAccounting", "BlockIOAccounting", "TasksAccounting",
1461                        "SendSIGHUP", "SendSIGKILL", "WakeSystem", "DefaultDependencies",
1462                        "IgnoreSIGPIPE", "TTYVHangup", "TTYReset", "RemainAfterExit",
1463                        "PrivateTmp", "PrivateDevices", "PrivateNetwork", "NoNewPrivileges",
1464                        "SyslogLevelPrefix", "Delegate")) {
1465
1466                 r = parse_boolean(eq);
1467                 if (r < 0) {
1468                         log_error("Failed to parse boolean assignment %s.", assignment);
1469                         return -EINVAL;
1470                 }
1471
1472                 r = sd_bus_message_append(m, "v", "b", r);
1473
1474         } else if (streq(field, "MemoryLimit")) {
1475                 uint64_t bytes;
1476
1477                 if (isempty(eq) || streq(eq, "infinity"))
1478                         bytes = (uint64_t) -1;
1479                 else {
1480                 r = parse_size(eq, 1024, &bytes);
1481                 if (r < 0) {
1482                         log_error("Failed to parse bytes specification %s", assignment);
1483                         return -EINVAL;
1484                 }
1485                 }
1486
1487                 r = sd_bus_message_append(m, "v", "t", bytes);
1488
1489         } else if (streq(field, "TasksMax")) {
1490                 uint64_t n;
1491
1492                 if (isempty(eq) || streq(eq, "infinity"))
1493                         n = (uint64_t) -1;
1494                 else {
1495                         r = safe_atou64(eq, &n);
1496                         if (r < 0) {
1497                                 log_error("Failed to parse maximum tasks specification %s", assignment);
1498                                 return -EINVAL;
1499                         }
1500                 }
1501
1502                 r = sd_bus_message_append(m, "v", "t", n);
1503
1504         } else if (STR_IN_SET(field, "CPUShares", "StartupCPUShares")) {
1505                 uint64_t u;
1506
1507                 r = cg_cpu_shares_parse(eq, &u);
1508                 if (r < 0) {
1509                         log_error("Failed to parse %s value %s.", field, eq);
1510                         return -EINVAL;
1511                 }
1512
1513                 r = sd_bus_message_append(m, "v", "t", u);
1514
1515         } else if (STR_IN_SET(field, "BlockIOWeight", "StartupBlockIOWeight")) {
1516                 uint64_t u;
1517
1518                 r = cg_cpu_shares_parse(eq, &u);
1519                 if (r < 0) {
1520                         log_error("Failed to parse %s value %s.", field, eq);
1521                         return -EINVAL;
1522                 }
1523
1524                 r = sd_bus_message_append(m, "v", "t", u);
1525
1526         } else if (STR_IN_SET(field,
1527                               "User", "Group", "DevicePolicy", "KillMode",
1528                               "UtmpIdentifier", "UtmpMode", "PAMName", "TTYPath",
1529                               "StandardInput", "StandardOutput", "StandardError",
1530                               "Description", "Slice", "Type", "WorkingDirectory",
1531                               "RootDirectory", "SyslogIdentifier", "ProtectSystem",
1532                               "ProtectHome"))
1533                 r = sd_bus_message_append(m, "v", "s", eq);
1534
1535         else if (streq(field, "SyslogLevel")) {
1536                 int level;
1537
1538                 level = log_level_from_string(eq);
1539                 if (level < 0) {
1540                         log_error("Failed to parse %s value %s.", field, eq);
1541                         return -EINVAL;
1542                 }
1543
1544                 r = sd_bus_message_append(m, "v", "i", level);
1545
1546         } else if (streq(field, "SyslogFacility")) {
1547                 int facility;
1548
1549                 facility = log_facility_unshifted_from_string(eq);
1550                 if (facility < 0) {
1551                         log_error("Failed to parse %s value %s.", field, eq);
1552                         return -EINVAL;
1553                 }
1554
1555                 r = sd_bus_message_append(m, "v", "i", facility);
1556
1557         } else if (streq(field, "DeviceAllow")) {
1558
1559                 if (isempty(eq))
1560                         r = sd_bus_message_append(m, "v", "a(ss)", 0);
1561                 else {
1562                         const char *path, *rwm, *e;
1563
1564                         e = strchr(eq, ' ');
1565                         if (e) {
1566                                 path = strndupa(eq, e - eq);
1567                                 rwm = e+1;
1568                         } else {
1569                                 path = eq;
1570                                 rwm = "";
1571                         }
1572
1573                         if (!path_startswith(path, "/dev")) {
1574                                 log_error("%s is not a device file in /dev.", path);
1575                                 return -EINVAL;
1576                         }
1577
1578                         r = sd_bus_message_append(m, "v", "a(ss)", 1, path, rwm);
1579                 }
1580
1581         } else if (STR_IN_SET(field, "BlockIOReadBandwidth", "BlockIOWriteBandwidth")) {
1582
1583                 if (isempty(eq))
1584                         r = sd_bus_message_append(m, "v", "a(st)", 0);
1585                 else {
1586                         const char *path, *bandwidth, *e;
1587                         uint64_t bytes;
1588
1589                         e = strchr(eq, ' ');
1590                         if (e) {
1591                                 path = strndupa(eq, e - eq);
1592                                 bandwidth = e+1;
1593                         } else {
1594                                 log_error("Failed to parse %s value %s.", field, eq);
1595                                 return -EINVAL;
1596                         }
1597
1598                         if (!path_startswith(path, "/dev")) {
1599                                 log_error("%s is not a device file in /dev.", path);
1600                                 return -EINVAL;
1601                         }
1602
1603                         r = parse_size(bandwidth, 1000, &bytes);
1604                         if (r < 0) {
1605                                 log_error("Failed to parse byte value %s.", bandwidth);
1606                                 return -EINVAL;
1607                         }
1608
1609                         r = sd_bus_message_append(m, "v", "a(st)", 1, path, bytes);
1610                 }
1611
1612         } else if (streq(field, "BlockIODeviceWeight")) {
1613
1614                 if (isempty(eq))
1615                         r = sd_bus_message_append(m, "v", "a(st)", 0);
1616                 else {
1617                         const char *path, *weight, *e;
1618                         uint64_t u;
1619
1620                         e = strchr(eq, ' ');
1621                         if (e) {
1622                                 path = strndupa(eq, e - eq);
1623                                 weight = e+1;
1624                         } else {
1625                                 log_error("Failed to parse %s value %s.", field, eq);
1626                                 return -EINVAL;
1627                         }
1628
1629                         if (!path_startswith(path, "/dev")) {
1630                                 log_error("%s is not a device file in /dev.", path);
1631                                 return -EINVAL;
1632                         }
1633
1634                         r = safe_atou64(weight, &u);
1635                         if (r < 0) {
1636                                 log_error("Failed to parse %s value %s.", field, weight);
1637                                 return -EINVAL;
1638                         }
1639                         r = sd_bus_message_append(m, "v", "a(st)", path, u);
1640                 }
1641
1642         } else if (rlimit_from_string(field) >= 0) {
1643                 uint64_t rl;
1644
1645                 if (streq(eq, "infinity"))
1646                         rl = (uint64_t) -1;
1647                 else {
1648                         r = safe_atou64(eq, &rl);
1649                         if (r < 0) {
1650                                 log_error("Invalid resource limit: %s", eq);
1651                                 return -EINVAL;
1652                         }
1653                 }
1654
1655                 r = sd_bus_message_append(m, "v", "t", rl);
1656
1657         } else if (streq(field, "Nice")) {
1658                 int32_t i;
1659
1660                 r = safe_atoi32(eq, &i);
1661                 if (r < 0) {
1662                         log_error("Failed to parse %s value %s.", field, eq);
1663                         return -EINVAL;
1664                 }
1665
1666                 r = sd_bus_message_append(m, "v", "i", i);
1667
1668         } else if (STR_IN_SET(field, "Environment", "PassEnvironment")) {
1669                 const char *p;
1670
1671                 r = sd_bus_message_open_container(m, 'v', "as");
1672                 if (r < 0)
1673                         return bus_log_create_error(r);
1674
1675                 r = sd_bus_message_open_container(m, 'a', "s");
1676                 if (r < 0)
1677                         return bus_log_create_error(r);
1678
1679                 p = eq;
1680
1681                 for (;;) {
1682                         _cleanup_free_ char *word = NULL;
1683
1684                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
1685                         if (r < 0) {
1686                                 log_error("Failed to parse Environment value %s", eq);
1687                                 return -EINVAL;
1688                         }
1689                         if (r == 0)
1690                                 break;
1691
1692                         if (streq(field, "Environment")) {
1693                                 if (!env_assignment_is_valid(word)) {
1694                                         log_error("Invalid environment assignment: %s", word);
1695                                         return -EINVAL;
1696                                 }
1697                         } else {  /* PassEnvironment */
1698                                 if (!env_name_is_valid(word)) {
1699                                         log_error("Invalid environment variable name: %s", word);
1700                                         return -EINVAL;
1701                                 }
1702                         }
1703
1704                         r = sd_bus_message_append_basic(m, 's', word);
1705                         if (r < 0)
1706                                 return bus_log_create_error(r);
1707                 }
1708
1709                 r = sd_bus_message_close_container(m);
1710                 if (r < 0)
1711                         return bus_log_create_error(r);
1712
1713                 r = sd_bus_message_close_container(m);
1714
1715         } else if (streq(field, "KillSignal")) {
1716                 int sig;
1717
1718                 sig = signal_from_string_try_harder(eq);
1719                 if (sig < 0) {
1720                         log_error("Failed to parse %s value %s.", field, eq);
1721                         return -EINVAL;
1722                 }
1723
1724                 r = sd_bus_message_append(m, "v", "i", sig);
1725
1726         } else if (streq(field, "AccuracySec")) {
1727                 usec_t u;
1728
1729                 r = parse_sec(eq, &u);
1730                 if (r < 0) {
1731                         log_error("Failed to parse %s value %s", field, eq);
1732                         return -EINVAL;
1733                 }
1734
1735                 r = sd_bus_message_append(m, "v", "t", u);
1736         } else if (streq(field, "TimerSlackNSec")) {
1737                 nsec_t n;
1738
1739                 r = parse_nsec(eq, &n);
1740                 if (r < 0) {
1741                         log_error("Failed to parse %s value %s", field, eq);
1742                         return -EINVAL;
1743                 }
1744
1745                 r = sd_bus_message_append(m, "v", "t", n);
1746         } else if (streq(field, "OOMScoreAdjust")) {
1747                 int oa;
1748
1749                 r = safe_atoi(eq, &oa);
1750                 if (r < 0) {
1751                         log_error("Failed to parse %s value %s", field, eq);
1752                         return -EINVAL;
1753                 }
1754
1755                 if (!oom_score_adjust_is_valid(oa)) {
1756                         log_error("OOM score adjust value out of range");
1757                         return -EINVAL;
1758                 }
1759
1760                 r = sd_bus_message_append(m, "v", "i", oa);
1761         } else if (STR_IN_SET(field, "ReadWriteDirectories", "ReadOnlyDirectories", "InaccessibleDirectories")) {
1762                 const char *p;
1763
1764                 r = sd_bus_message_open_container(m, 'v', "as");
1765                 if (r < 0)
1766                         return bus_log_create_error(r);
1767
1768                 r = sd_bus_message_open_container(m, 'a', "s");
1769                 if (r < 0)
1770                         return bus_log_create_error(r);
1771
1772                 p = eq;
1773
1774                 for (;;) {
1775                         _cleanup_free_ char *word = NULL;
1776                         int offset;
1777
1778                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);
1779                         if (r < 0) {
1780                                 log_error("Failed to parse %s value %s", field, eq);
1781                                 return -EINVAL;
1782                         }
1783                         if (r == 0)
1784                                 break;
1785
1786                         if (!utf8_is_valid(word)) {
1787                                 log_error("Failed to parse %s value %s", field, eq);
1788                                 return -EINVAL;
1789                         }
1790
1791                         offset = word[0] == '-';
1792                         if (!path_is_absolute(word + offset)) {
1793                                 log_error("Failed to parse %s value %s", field, eq);
1794                                 return -EINVAL;
1795                         }
1796
1797                         path_kill_slashes(word + offset);
1798
1799                         r = sd_bus_message_append_basic(m, 's', word);
1800                         if (r < 0)
1801                                 return bus_log_create_error(r);
1802                 }
1803
1804                 r = sd_bus_message_close_container(m);
1805                 if (r < 0)
1806                         return bus_log_create_error(r);
1807
1808                 r = sd_bus_message_close_container(m);
1809
1810         } else if (streq(field, "RuntimeDirectory")) {
1811                 const char *p;
1812
1813                 r = sd_bus_message_open_container(m, 'v', "as");
1814                 if (r < 0)
1815                         return bus_log_create_error(r);
1816
1817                 r = sd_bus_message_open_container(m, 'a', "s");
1818                 if (r < 0)
1819                         return bus_log_create_error(r);
1820
1821                 p = eq;
1822
1823                 for (;;) {
1824                         _cleanup_free_ char *word = NULL;
1825
1826                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);
1827                         if (r < 0)
1828                                 return log_error_errno(r, "Failed to parse %s value %s", field, eq);
1829
1830                         if (r == 0)
1831                                 break;
1832
1833                         r = sd_bus_message_append_basic(m, 's', word);
1834                         if (r < 0)
1835                                 return bus_log_create_error(r);
1836                 }
1837
1838                 r = sd_bus_message_close_container(m);
1839                 if (r < 0)
1840                         return bus_log_create_error(r);
1841
1842                 r = sd_bus_message_close_container(m);
1843
1844         } else {
1845                 log_error("Unknown assignment %s.", assignment);
1846                 return -EINVAL;
1847         }
1848
1849         if (r < 0)
1850                 return bus_log_create_error(r);
1851
1852         return 0;
1853 }
1854 #endif // 0
1855
1856 typedef struct BusWaitForJobs {
1857         sd_bus *bus;
1858         Set *jobs;
1859
1860         char *name;
1861         char *result;
1862
1863         sd_bus_slot *slot_job_removed;
1864         sd_bus_slot *slot_disconnected;
1865 } BusWaitForJobs;
1866
1867 #if 0 /// UNNEEDED by elogind
1868 static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1869         assert(m);
1870
1871         log_error("Warning! D-Bus connection terminated.");
1872         sd_bus_close(sd_bus_message_get_bus(m));
1873
1874         return 0;
1875 }
1876
1877 static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1878         const char *path, *unit, *result;
1879         BusWaitForJobs *d = userdata;
1880         uint32_t id;
1881         char *found;
1882         int r;
1883
1884         assert(m);
1885         assert(d);
1886
1887         r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result);
1888         if (r < 0) {
1889                 bus_log_parse_error(r);
1890                 return 0;
1891         }
1892
1893         found = set_remove(d->jobs, (char*) path);
1894         if (!found)
1895                 return 0;
1896
1897         free(found);
1898
1899         if (!isempty(result))
1900                 d->result = strdup(result);
1901
1902         if (!isempty(unit))
1903                 d->name = strdup(unit);
1904
1905         return 0;
1906 }
1907
1908 void bus_wait_for_jobs_free(BusWaitForJobs *d) {
1909         if (!d)
1910                 return;
1911
1912         set_free_free(d->jobs);
1913
1914         sd_bus_slot_unref(d->slot_disconnected);
1915         sd_bus_slot_unref(d->slot_job_removed);
1916
1917         sd_bus_unref(d->bus);
1918
1919         free(d->name);
1920         free(d->result);
1921
1922         free(d);
1923 }
1924
1925 int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret) {
1926         _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *d = NULL;
1927         int r;
1928
1929         assert(bus);
1930         assert(ret);
1931
1932         d = new0(BusWaitForJobs, 1);
1933         if (!d)
1934                 return -ENOMEM;
1935
1936         d->bus = sd_bus_ref(bus);
1937
1938         /* When we are a bus client we match by sender. Direct
1939          * connections OTOH have no initialized sender field, and
1940          * hence we ignore the sender then */
1941         r = sd_bus_add_match(
1942                         bus,
1943                         &d->slot_job_removed,
1944                         bus->bus_client ?
1945                         "type='signal',"
1946                         "sender='org.freedesktop.systemd1',"
1947                         "interface='org.freedesktop.systemd1.Manager',"
1948                         "member='JobRemoved',"
1949                         "path='/org/freedesktop/systemd1'" :
1950                         "type='signal',"
1951                         "interface='org.freedesktop.systemd1.Manager',"
1952                         "member='JobRemoved',"
1953                         "path='/org/freedesktop/systemd1'",
1954                         match_job_removed, d);
1955         if (r < 0)
1956                 return r;
1957
1958         r = sd_bus_add_match(
1959                         bus,
1960                         &d->slot_disconnected,
1961                         "type='signal',"
1962                         "sender='org.freedesktop.DBus.Local',"
1963                         "interface='org.freedesktop.DBus.Local',"
1964                         "member='Disconnected'",
1965                         match_disconnected, d);
1966         if (r < 0)
1967                 return r;
1968
1969         *ret = d;
1970         d = NULL;
1971
1972         return 0;
1973 }
1974
1975 static int bus_process_wait(sd_bus *bus) {
1976         int r;
1977
1978         for (;;) {
1979                 r = sd_bus_process(bus, NULL);
1980                 if (r < 0)
1981                         return r;
1982                 if (r > 0)
1983                         return 0;
1984
1985                 r = sd_bus_wait(bus, (uint64_t) -1);
1986                 if (r < 0)
1987                         return r;
1988         }
1989 }
1990
1991 static int bus_job_get_service_result(BusWaitForJobs *d, char **result) {
1992         _cleanup_free_ char *dbus_path = NULL;
1993
1994         assert(d);
1995         assert(d->name);
1996         assert(result);
1997
1998         dbus_path = unit_dbus_path_from_name(d->name);
1999         if (!dbus_path)
2000                 return -ENOMEM;
2001
2002         return sd_bus_get_property_string(d->bus,
2003                                           "org.freedesktop.systemd1",
2004                                           dbus_path,
2005                                           "org.freedesktop.systemd1.Service",
2006                                           "Result",
2007                                           NULL,
2008                                           result);
2009 }
2010
2011 static const struct {
2012         const char *result, *explanation;
2013 } explanations [] = {
2014         { "resources",   "a configured resource limit was exceeded" },
2015         { "timeout",     "a timeout was exceeded" },
2016         { "exit-code",   "the control process exited with error code" },
2017         { "signal",      "a fatal signal was delivered to the control process" },
2018         { "core-dump",   "a fatal signal was delivered causing the control process to dump core" },
2019         { "watchdog",    "the service failed to send watchdog ping" },
2020         { "start-limit", "start of the service was attempted too often" }
2021 };
2022
2023 static void log_job_error_with_service_result(const char* service, const char *result) {
2024         _cleanup_free_ char *service_shell_quoted = NULL;
2025
2026         assert(service);
2027
2028         service_shell_quoted = shell_maybe_quote(service);
2029
2030         if (!isempty(result)) {
2031                 unsigned i;
2032
2033                 for (i = 0; i < ELEMENTSOF(explanations); ++i)
2034                         if (streq(result, explanations[i].result))
2035                                 break;
2036
2037                 if (i < ELEMENTSOF(explanations)) {
2038                         log_error("Job for %s failed because %s. See \"systemctl status %s\" and \"journalctl -xe\" for details.\n",
2039                                   service,
2040                                   explanations[i].explanation,
2041                                   strna(service_shell_quoted));
2042
2043                         goto finish;
2044                 }
2045         }
2046
2047         log_error("Job for %s failed. See \"systemctl status %s\" and \"journalctl -xe\" for details.\n",
2048                   service,
2049                   strna(service_shell_quoted));
2050
2051 finish:
2052         /* For some results maybe additional explanation is required */
2053         if (streq_ptr(result, "start-limit"))
2054                 log_info("To force a start use \"systemctl reset-failed %1$s\" followed by \"systemctl start %1$s\" again.",
2055                          strna(service_shell_quoted));
2056 }
2057
2058 static int check_wait_response(BusWaitForJobs *d, bool quiet) {
2059         int r = 0;
2060
2061         assert(d->result);
2062
2063         if (!quiet) {
2064                 if (streq(d->result, "canceled"))
2065                         log_error("Job for %s canceled.", strna(d->name));
2066                 else if (streq(d->result, "timeout"))
2067                         log_error("Job for %s timed out.", strna(d->name));
2068                 else if (streq(d->result, "dependency"))
2069                         log_error("A dependency job for %s failed. See 'journalctl -xe' for details.", strna(d->name));
2070                 else if (streq(d->result, "invalid"))
2071                         log_error("Job for %s invalid.", strna(d->name));
2072                 else if (streq(d->result, "assert"))
2073                         log_error("Assertion failed on job for %s.", strna(d->name));
2074                 else if (streq(d->result, "unsupported"))
2075                         log_error("Operation on or unit type of %s not supported on this system.", strna(d->name));
2076                 else if (!streq(d->result, "done") && !streq(d->result, "skipped")) {
2077                         if (d->name) {
2078                                 int q;
2079                                 _cleanup_free_ char *result = NULL;
2080
2081                                 q = bus_job_get_service_result(d, &result);
2082                                 if (q < 0)
2083                                         log_debug_errno(q, "Failed to get Result property of service %s: %m", d->name);
2084
2085                                 log_job_error_with_service_result(d->name, result);
2086                         } else
2087                                 log_error("Job failed. See \"journalctl -xe\" for details.");
2088                 }
2089         }
2090
2091         if (streq(d->result, "canceled"))
2092                 r = -ECANCELED;
2093         else if (streq(d->result, "timeout"))
2094                 r = -ETIME;
2095         else if (streq(d->result, "dependency"))
2096                 r = -EIO;
2097         else if (streq(d->result, "invalid"))
2098                 r = -ENOEXEC;
2099         else if (streq(d->result, "assert"))
2100                 r = -EPROTO;
2101         else if (streq(d->result, "unsupported"))
2102                 r = -EOPNOTSUPP;
2103         else if (!streq(d->result, "done") && !streq(d->result, "skipped"))
2104                 r = -EIO;
2105
2106         return r;
2107 }
2108
2109 int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet) {
2110         int r = 0;
2111
2112         assert(d);
2113
2114         while (!set_isempty(d->jobs)) {
2115                 int q;
2116
2117                 q = bus_process_wait(d->bus);
2118                 if (q < 0)
2119                         return log_error_errno(q, "Failed to wait for response: %m");
2120
2121                 if (d->result) {
2122                         q = check_wait_response(d, quiet);
2123                         /* Return the first error as it is most likely to be
2124                          * meaningful. */
2125                         if (q < 0 && r == 0)
2126                                 r = q;
2127
2128                         log_debug_errno(q, "Got result %s/%m for job %s", strna(d->result), strna(d->name));
2129                 }
2130
2131                 d->name = mfree(d->name);
2132                 d->result = mfree(d->result);
2133         }
2134
2135         return r;
2136 }
2137
2138 int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) {
2139         int r;
2140
2141         assert(d);
2142
2143         r = set_ensure_allocated(&d->jobs, &string_hash_ops);
2144         if (r < 0)
2145                 return r;
2146
2147         return set_put_strdup(d->jobs, path);
2148 }
2149
2150 int bus_wait_for_jobs_one(BusWaitForJobs *d, const char *path, bool quiet) {
2151         int r;
2152
2153         r = bus_wait_for_jobs_add(d, path);
2154         if (r < 0)
2155                 return log_oom();
2156
2157         return bus_wait_for_jobs(d, quiet);
2158 }
2159
2160 int bus_deserialize_and_dump_unit_file_changes(sd_bus_message *m, bool quiet, UnitFileChange **changes, unsigned *n_changes) {
2161         const char *type, *path, *source;
2162         int r;
2163
2164         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(sss)");
2165         if (r < 0)
2166                 return bus_log_parse_error(r);
2167
2168         while ((r = sd_bus_message_read(m, "(sss)", &type, &path, &source)) > 0) {
2169                 if (!quiet) {
2170                         if (streq(type, "symlink"))
2171                                 log_info("Created symlink from %s to %s.", path, source);
2172                         else
2173                                 log_info("Removed symlink %s.", path);
2174                 }
2175
2176                 r = unit_file_changes_add(changes, n_changes, streq(type, "symlink") ? UNIT_FILE_SYMLINK : UNIT_FILE_UNLINK, path, source);
2177                 if (r < 0)
2178                         return r;
2179         }
2180         if (r < 0)
2181                 return bus_log_parse_error(r);
2182
2183         r = sd_bus_message_exit_container(m);
2184         if (r < 0)
2185                 return bus_log_parse_error(r);
2186
2187         return 0;
2188 }
2189
2190 /**
2191  * bus_path_encode_unique() - encode unique object path
2192  * @b: bus connection or NULL
2193  * @prefix: object path prefix
2194  * @sender_id: unique-name of client, or NULL
2195  * @external_id: external ID to be chosen by client, or NULL
2196  * @ret_path: storage for encoded object path pointer
2197  *
2198  * Whenever we provide a bus API that allows clients to create and manage
2199  * server-side objects, we need to provide a unique name for these objects. If
2200  * we let the server choose the name, we suffer from a race condition: If a
2201  * client creates an object asynchronously, it cannot destroy that object until
2202  * it received the method reply. It cannot know the name of the new object,
2203  * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
2204  *
2205  * Therefore, many APIs allow the client to choose the unique name for newly
2206  * created objects. There're two problems to solve, though:
2207  *    1) Object names are usually defined via dbus object paths, which are
2208  *       usually globally namespaced. Therefore, multiple clients must be able
2209  *       to choose unique object names without interference.
2210  *    2) If multiple libraries share the same bus connection, they must be
2211  *       able to choose unique object names without interference.
2212  * The first problem is solved easily by prefixing a name with the
2213  * unique-bus-name of a connection. The server side must enforce this and
2214  * reject any other name. The second problem is solved by providing unique
2215  * suffixes from within sd-bus.
2216  *
2217  * This helper allows clients to create unique object-paths. It uses the
2218  * template '/prefix/sender_id/external_id' and returns the new path in
2219  * @ret_path (must be freed by the caller).
2220  * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
2221  * NULL, this function allocates a unique suffix via @b (by requesting a new
2222  * cookie). If both @sender_id and @external_id are given, @b can be passed as
2223  * NULL.
2224  *
2225  * Returns: 0 on success, negative error code on failure.
2226  */
2227 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
2228         _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
2229         char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
2230         int r;
2231
2232         assert_return(b || (sender_id && external_id), -EINVAL);
2233         assert_return(object_path_is_valid(prefix), -EINVAL);
2234         assert_return(ret_path, -EINVAL);
2235
2236         if (!sender_id) {
2237                 r = sd_bus_get_unique_name(b, &sender_id);
2238                 if (r < 0)
2239                         return r;
2240         }
2241
2242         if (!external_id) {
2243                 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
2244                 external_id = external_buf;
2245         }
2246
2247         sender_label = bus_label_escape(sender_id);
2248         if (!sender_label)
2249                 return -ENOMEM;
2250
2251         external_label = bus_label_escape(external_id);
2252         if (!external_label)
2253                 return -ENOMEM;
2254
2255         p = strjoin(prefix, "/", sender_label, "/", external_label, NULL);
2256         if (!p)
2257                 return -ENOMEM;
2258
2259         *ret_path = p;
2260         return 0;
2261 }
2262
2263 /**
2264  * bus_path_decode_unique() - decode unique object path
2265  * @path: object path to decode
2266  * @prefix: object path prefix
2267  * @ret_sender: output parameter for sender-id label
2268  * @ret_external: output parameter for external-id label
2269  *
2270  * This does the reverse of bus_path_encode_unique() (see its description for
2271  * details). Both trailing labels, sender-id and external-id, are unescaped and
2272  * returned in the given output parameters (the caller must free them).
2273  *
2274  * Note that this function returns 0 if the path does not match the template
2275  * (see bus_path_encode_unique()), 1 if it matched.
2276  *
2277  * Returns: Negative error code on failure, 0 if the given object path does not
2278  *          match the template (return parameters are set to NULL), 1 if it was
2279  *          parsed successfully (return parameters contain allocated labels).
2280  */
2281 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
2282         const char *p, *q;
2283         char *sender, *external;
2284
2285         assert(object_path_is_valid(path));
2286         assert(object_path_is_valid(prefix));
2287         assert(ret_sender);
2288         assert(ret_external);
2289
2290         p = object_path_startswith(path, prefix);
2291         if (!p) {
2292                 *ret_sender = NULL;
2293                 *ret_external = NULL;
2294                 return 0;
2295         }
2296
2297         q = strchr(p, '/');
2298         if (!q) {
2299                 *ret_sender = NULL;
2300                 *ret_external = NULL;
2301                 return 0;
2302         }
2303
2304         sender = bus_label_unescape_n(p, q - p);
2305         external = bus_label_unescape(q + 1);
2306         if (!sender || !external) {
2307                 free(sender);
2308                 free(external);
2309                 return -ENOMEM;
2310         }
2311
2312         *ret_sender = sender;
2313         *ret_external = external;
2314         return 1;
2315 }
2316 #endif // 0
2317
2318 bool is_kdbus_wanted(void) {
2319         _cleanup_free_ char *value = NULL;
2320 #ifdef ENABLE_KDBUS
2321         const bool configured = true;
2322 #else
2323         const bool configured = false;
2324 #endif
2325
2326         int r;
2327
2328         if (get_proc_cmdline_key("kdbus", NULL) > 0)
2329                 return true;
2330
2331         r = get_proc_cmdline_key("kdbus=", &value);
2332         if (r <= 0)
2333                 return configured;
2334
2335         return parse_boolean(value) == 1;
2336 }
2337
2338 bool is_kdbus_available(void) {
2339         _cleanup_close_ int fd = -1;
2340         struct kdbus_cmd cmd = { .size = sizeof(cmd), .flags = KDBUS_FLAG_NEGOTIATE };
2341
2342         if (!is_kdbus_wanted())
2343                 return false;
2344
2345         fd = open("/sys/fs/kdbus/control", O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
2346         if (fd < 0)
2347                 return false;
2348
2349         return ioctl(fd, KDBUS_CMD_BUS_MAKE, &cmd) >= 0;
2350 }
2351
2352 #if 0 /// UNNEEDED by elogind
2353 int bus_property_get_rlimit(
2354                 sd_bus *bus,
2355                 const char *path,
2356                 const char *interface,
2357                 const char *property,
2358                 sd_bus_message *reply,
2359                 void *userdata,
2360                 sd_bus_error *error) {
2361
2362         struct rlimit *rl;
2363         uint64_t u;
2364         rlim_t x;
2365
2366         assert(bus);
2367         assert(reply);
2368         assert(userdata);
2369
2370         rl = *(struct rlimit**) userdata;
2371         if (rl)
2372                 x = rl->rlim_max;
2373         else {
2374                 struct rlimit buf = {};
2375                 int z;
2376
2377                 z = rlimit_from_string(strstr(property, "Limit"));
2378                 assert(z >= 0);
2379
2380                 getrlimit(z, &buf);
2381                 x = buf.rlim_max;
2382         }
2383
2384         /* rlim_t might have different sizes, let's map
2385          * RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on
2386          * all archs */
2387         u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
2388
2389         return sd_bus_message_append(reply, "t", u);
2390 }
2391 #endif // 0