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, rl;
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         r = sd_bus_message_open_container(m, SD_BUS_TYPE_STRUCT, "sv");
1408         if (r < 0)
1409                 return bus_log_create_error(r);
1410
1411         field = strndupa(assignment, eq - assignment);
1412         eq ++;
1413
1414         if (streq(field, "CPUQuota")) {
1415
1416                 if (isempty(eq))
1417                         r = sd_bus_message_append(m, "sv", "CPUQuotaPerSecUSec", "t", USEC_INFINITY);
1418                 else if (endswith(eq, "%")) {
1419                         double percent;
1420
1421                         if (sscanf(eq, "%lf%%", &percent) != 1 || percent <= 0) {
1422                                 log_error("CPU quota '%s' invalid.", eq);
1423                                 return -EINVAL;
1424                         }
1425
1426                         r = sd_bus_message_append(m, "sv", "CPUQuotaPerSecUSec", "t", (usec_t) percent * USEC_PER_SEC / 100);
1427                 } else {
1428                         log_error("CPU quota needs to be in percent.");
1429                         return -EINVAL;
1430                 }
1431
1432                 goto finish;
1433
1434         } else if (streq(field, "EnvironmentFile")) {
1435
1436                 r = sd_bus_message_append(m, "sv", "EnvironmentFiles", "a(sb)", 1,
1437                                           eq[0] == '-' ? eq + 1 : eq,
1438                                           eq[0] == '-');
1439                 goto finish;
1440
1441         } else if (STR_IN_SET(field, "AccuracySec", "RandomizedDelaySec")) {
1442                 char *n;
1443                 usec_t t;
1444                 size_t l;
1445                 r = parse_sec(eq, &t);
1446                 if (r < 0)
1447                         return log_error_errno(r, "Failed to parse %s= parameter: %s", field, eq);
1448
1449                 l = strlen(field);
1450                 n = newa(char, l + 2);
1451                 if (!n)
1452                         return log_oom();
1453
1454                 /* Change suffix Sec → USec */
1455                 strcpy(mempcpy(n, field, l - 3), "USec");
1456                 r = sd_bus_message_append(m, "sv", n, "t", t);
1457                 goto finish;
1458         }
1459
1460         r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, field);
1461         if (r < 0)
1462                 return bus_log_create_error(r);
1463
1464         rl = rlimit_from_string(field);
1465         if (rl >= 0) {
1466                 const char *sn;
1467                 struct rlimit l;
1468
1469                 r = rlimit_parse(rl, eq, &l);
1470                 if (r < 0)
1471                         return log_error_errno(r, "Failed to parse resource limit: %s", eq);
1472
1473                 r = sd_bus_message_append(m, "v", "t", l.rlim_max);
1474                 if (r < 0)
1475                         return bus_log_create_error(r);
1476
1477                 r = sd_bus_message_close_container(m);
1478                 if (r < 0)
1479                         return bus_log_create_error(r);
1480
1481                 r = sd_bus_message_open_container(m, SD_BUS_TYPE_STRUCT, "sv");
1482                 if (r < 0)
1483                         return bus_log_create_error(r);
1484
1485                 sn = strjoina(field, "Soft");
1486                 r = sd_bus_message_append(m, "sv", sn, "t", l.rlim_cur);
1487
1488         } else if (STR_IN_SET(field,
1489                        "CPUAccounting", "MemoryAccounting", "BlockIOAccounting", "TasksAccounting",
1490                        "SendSIGHUP", "SendSIGKILL", "WakeSystem", "DefaultDependencies",
1491                        "IgnoreSIGPIPE", "TTYVHangup", "TTYReset", "RemainAfterExit",
1492                        "PrivateTmp", "PrivateDevices", "PrivateNetwork", "NoNewPrivileges",
1493                        "SyslogLevelPrefix", "Delegate", "RemainAfterElapse")) {
1494
1495                 r = parse_boolean(eq);
1496                 if (r < 0)
1497                         return log_error_errno(r, "Failed to parse boolean assignment %s.", assignment);
1498
1499                 r = sd_bus_message_append(m, "v", "b", r);
1500
1501         } else if (streq(field, "MemoryLimit")) {
1502                 uint64_t bytes;
1503
1504                 if (isempty(eq) || streq(eq, "infinity"))
1505                         bytes = (uint64_t) -1;
1506                 else {
1507                 r = parse_size(eq, 1024, &bytes);
1508                 if (r < 0) {
1509                         log_error("Failed to parse bytes specification %s", assignment);
1510                         return -EINVAL;
1511                 }
1512                 }
1513
1514                 r = sd_bus_message_append(m, "v", "t", bytes);
1515
1516         } else if (streq(field, "TasksMax")) {
1517                 uint64_t n;
1518
1519                 if (isempty(eq) || streq(eq, "infinity"))
1520                         n = (uint64_t) -1;
1521                 else {
1522                         r = safe_atou64(eq, &n);
1523                         if (r < 0) {
1524                                 log_error("Failed to parse maximum tasks specification %s", assignment);
1525                                 return -EINVAL;
1526                         }
1527                 }
1528
1529                 r = sd_bus_message_append(m, "v", "t", n);
1530
1531         } else if (STR_IN_SET(field, "CPUShares", "StartupCPUShares")) {
1532                 uint64_t u;
1533
1534                 r = cg_cpu_shares_parse(eq, &u);
1535                 if (r < 0) {
1536                         log_error("Failed to parse %s value %s.", field, eq);
1537                         return -EINVAL;
1538                 }
1539
1540                 r = sd_bus_message_append(m, "v", "t", u);
1541
1542         } else if (STR_IN_SET(field, "BlockIOWeight", "StartupBlockIOWeight")) {
1543                 uint64_t u;
1544
1545                 r = cg_cpu_shares_parse(eq, &u);
1546                 if (r < 0) {
1547                         log_error("Failed to parse %s value %s.", field, eq);
1548                         return -EINVAL;
1549                 }
1550
1551                 r = sd_bus_message_append(m, "v", "t", u);
1552
1553         } else if (STR_IN_SET(field,
1554                               "User", "Group", "DevicePolicy", "KillMode",
1555                               "UtmpIdentifier", "UtmpMode", "PAMName", "TTYPath",
1556                               "StandardInput", "StandardOutput", "StandardError",
1557                               "Description", "Slice", "Type", "WorkingDirectory",
1558                               "RootDirectory", "SyslogIdentifier", "ProtectSystem",
1559                               "ProtectHome"))
1560                 r = sd_bus_message_append(m, "v", "s", eq);
1561
1562         else if (streq(field, "SyslogLevel")) {
1563                 int level;
1564
1565                 level = log_level_from_string(eq);
1566                 if (level < 0) {
1567                         log_error("Failed to parse %s value %s.", field, eq);
1568                         return -EINVAL;
1569                 }
1570
1571                 r = sd_bus_message_append(m, "v", "i", level);
1572
1573         } else if (streq(field, "SyslogFacility")) {
1574                 int facility;
1575
1576                 facility = log_facility_unshifted_from_string(eq);
1577                 if (facility < 0) {
1578                         log_error("Failed to parse %s value %s.", field, eq);
1579                         return -EINVAL;
1580                 }
1581
1582                 r = sd_bus_message_append(m, "v", "i", facility);
1583
1584         } else if (streq(field, "DeviceAllow")) {
1585
1586                 if (isempty(eq))
1587                         r = sd_bus_message_append(m, "v", "a(ss)", 0);
1588                 else {
1589                         const char *path, *rwm, *e;
1590
1591                         e = strchr(eq, ' ');
1592                         if (e) {
1593                                 path = strndupa(eq, e - eq);
1594                                 rwm = e+1;
1595                         } else {
1596                                 path = eq;
1597                                 rwm = "";
1598                         }
1599
1600                         if (!path_startswith(path, "/dev")) {
1601                                 log_error("%s is not a device file in /dev.", path);
1602                                 return -EINVAL;
1603                         }
1604
1605                         r = sd_bus_message_append(m, "v", "a(ss)", 1, path, rwm);
1606                 }
1607
1608         } else if (STR_IN_SET(field, "BlockIOReadBandwidth", "BlockIOWriteBandwidth")) {
1609
1610                 if (isempty(eq))
1611                         r = sd_bus_message_append(m, "v", "a(st)", 0);
1612                 else {
1613                         const char *path, *bandwidth, *e;
1614                         uint64_t bytes;
1615
1616                         e = strchr(eq, ' ');
1617                         if (e) {
1618                                 path = strndupa(eq, e - eq);
1619                                 bandwidth = e+1;
1620                         } else {
1621                                 log_error("Failed to parse %s value %s.", field, eq);
1622                                 return -EINVAL;
1623                         }
1624
1625                         if (!path_startswith(path, "/dev")) {
1626                                 log_error("%s is not a device file in /dev.", path);
1627                                 return -EINVAL;
1628                         }
1629
1630                         r = parse_size(bandwidth, 1000, &bytes);
1631                         if (r < 0) {
1632                                 log_error("Failed to parse byte value %s.", bandwidth);
1633                                 return -EINVAL;
1634                         }
1635
1636                         r = sd_bus_message_append(m, "v", "a(st)", 1, path, bytes);
1637                 }
1638
1639         } else if (streq(field, "BlockIODeviceWeight")) {
1640
1641                 if (isempty(eq))
1642                         r = sd_bus_message_append(m, "v", "a(st)", 0);
1643                 else {
1644                         const char *path, *weight, *e;
1645                         uint64_t u;
1646
1647                         e = strchr(eq, ' ');
1648                         if (e) {
1649                                 path = strndupa(eq, e - eq);
1650                                 weight = e+1;
1651                         } else {
1652                                 log_error("Failed to parse %s value %s.", field, eq);
1653                                 return -EINVAL;
1654                         }
1655
1656                         if (!path_startswith(path, "/dev")) {
1657                                 log_error("%s is not a device file in /dev.", path);
1658                                 return -EINVAL;
1659                         }
1660
1661                         r = safe_atou64(weight, &u);
1662                         if (r < 0) {
1663                                 log_error("Failed to parse %s value %s.", field, weight);
1664                                 return -EINVAL;
1665                         }
1666                         r = sd_bus_message_append(m, "v", "a(st)", path, u);
1667                 }
1668
1669         } else if (streq(field, "Nice")) {
1670                 int32_t i;
1671
1672                 r = safe_atoi32(eq, &i);
1673                 if (r < 0) {
1674                         log_error("Failed to parse %s value %s.", field, eq);
1675                         return -EINVAL;
1676                 }
1677
1678                 r = sd_bus_message_append(m, "v", "i", i);
1679
1680         } else if (STR_IN_SET(field, "Environment", "PassEnvironment")) {
1681                 const char *p;
1682
1683                 r = sd_bus_message_open_container(m, 'v', "as");
1684                 if (r < 0)
1685                         return bus_log_create_error(r);
1686
1687                 r = sd_bus_message_open_container(m, 'a', "s");
1688                 if (r < 0)
1689                         return bus_log_create_error(r);
1690
1691                 p = eq;
1692
1693                 for (;;) {
1694                         _cleanup_free_ char *word = NULL;
1695
1696                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
1697                         if (r < 0) {
1698                                 log_error("Failed to parse Environment value %s", eq);
1699                                 return -EINVAL;
1700                         }
1701                         if (r == 0)
1702                                 break;
1703
1704                         if (streq(field, "Environment")) {
1705                                 if (!env_assignment_is_valid(word)) {
1706                                         log_error("Invalid environment assignment: %s", word);
1707                                         return -EINVAL;
1708                                 }
1709                         } else {  /* PassEnvironment */
1710                                 if (!env_name_is_valid(word)) {
1711                                         log_error("Invalid environment variable name: %s", word);
1712                                         return -EINVAL;
1713                                 }
1714                         }
1715
1716                         r = sd_bus_message_append_basic(m, 's', word);
1717                         if (r < 0)
1718                                 return bus_log_create_error(r);
1719                 }
1720
1721                 r = sd_bus_message_close_container(m);
1722                 if (r < 0)
1723                         return bus_log_create_error(r);
1724
1725                 r = sd_bus_message_close_container(m);
1726
1727         } else if (streq(field, "KillSignal")) {
1728                 int sig;
1729
1730                 sig = signal_from_string_try_harder(eq);
1731                 if (sig < 0) {
1732                         log_error("Failed to parse %s value %s.", field, eq);
1733                         return -EINVAL;
1734                 }
1735
1736                 r = sd_bus_message_append(m, "v", "i", sig);
1737
1738         } else if (streq(field, "TimerSlackNSec")) {
1739                 nsec_t n;
1740
1741                 r = parse_nsec(eq, &n);
1742                 if (r < 0) {
1743                         log_error("Failed to parse %s value %s", field, eq);
1744                         return -EINVAL;
1745                 }
1746
1747                 r = sd_bus_message_append(m, "v", "t", n);
1748         } else if (streq(field, "OOMScoreAdjust")) {
1749                 int oa;
1750
1751                 r = safe_atoi(eq, &oa);
1752                 if (r < 0) {
1753                         log_error("Failed to parse %s value %s", field, eq);
1754                         return -EINVAL;
1755                 }
1756
1757                 if (!oom_score_adjust_is_valid(oa)) {
1758                         log_error("OOM score adjust value out of range");
1759                         return -EINVAL;
1760                 }
1761
1762                 r = sd_bus_message_append(m, "v", "i", oa);
1763         } else if (STR_IN_SET(field, "ReadWriteDirectories", "ReadOnlyDirectories", "InaccessibleDirectories")) {
1764                 const char *p;
1765
1766                 r = sd_bus_message_open_container(m, 'v', "as");
1767                 if (r < 0)
1768                         return bus_log_create_error(r);
1769
1770                 r = sd_bus_message_open_container(m, 'a', "s");
1771                 if (r < 0)
1772                         return bus_log_create_error(r);
1773
1774                 p = eq;
1775
1776                 for (;;) {
1777                         _cleanup_free_ char *word = NULL;
1778                         int offset;
1779
1780                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);
1781                         if (r < 0) {
1782                                 log_error("Failed to parse %s value %s", field, eq);
1783                                 return -EINVAL;
1784                         }
1785                         if (r == 0)
1786                                 break;
1787
1788                         if (!utf8_is_valid(word)) {
1789                                 log_error("Failed to parse %s value %s", field, eq);
1790                                 return -EINVAL;
1791                         }
1792
1793                         offset = word[0] == '-';
1794                         if (!path_is_absolute(word + offset)) {
1795                                 log_error("Failed to parse %s value %s", field, eq);
1796                                 return -EINVAL;
1797                         }
1798
1799                         path_kill_slashes(word + offset);
1800
1801                         r = sd_bus_message_append_basic(m, 's', word);
1802                         if (r < 0)
1803                                 return bus_log_create_error(r);
1804                 }
1805
1806                 r = sd_bus_message_close_container(m);
1807                 if (r < 0)
1808                         return bus_log_create_error(r);
1809
1810                 r = sd_bus_message_close_container(m);
1811
1812         } else if (streq(field, "RuntimeDirectory")) {
1813                 const char *p;
1814
1815                 r = sd_bus_message_open_container(m, 'v', "as");
1816                 if (r < 0)
1817                         return bus_log_create_error(r);
1818
1819                 r = sd_bus_message_open_container(m, 'a', "s");
1820                 if (r < 0)
1821                         return bus_log_create_error(r);
1822
1823                 p = eq;
1824
1825                 for (;;) {
1826                         _cleanup_free_ char *word = NULL;
1827
1828                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);
1829                         if (r < 0)
1830                                 return log_error_errno(r, "Failed to parse %s value %s", field, eq);
1831
1832                         if (r == 0)
1833                                 break;
1834
1835                         r = sd_bus_message_append_basic(m, 's', word);
1836                         if (r < 0)
1837                                 return bus_log_create_error(r);
1838                 }
1839
1840                 r = sd_bus_message_close_container(m);
1841                 if (r < 0)
1842                         return bus_log_create_error(r);
1843
1844                 r = sd_bus_message_close_container(m);
1845
1846         } else {
1847                 log_error("Unknown assignment %s.", assignment);
1848                 return -EINVAL;
1849         }
1850
1851 finish:
1852         if (r < 0)
1853                 return bus_log_create_error(r);
1854
1855         r = sd_bus_message_close_container(m);
1856         if (r < 0)
1857                 return bus_log_create_error(r);
1858
1859         return 0;
1860 }
1861 #endif // 0
1862
1863 typedef struct BusWaitForJobs {
1864         sd_bus *bus;
1865         Set *jobs;
1866
1867         char *name;
1868         char *result;
1869
1870         sd_bus_slot *slot_job_removed;
1871         sd_bus_slot *slot_disconnected;
1872 } BusWaitForJobs;
1873
1874 #if 0 /// UNNEEDED by elogind
1875 static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1876         assert(m);
1877
1878         log_error("Warning! D-Bus connection terminated.");
1879         sd_bus_close(sd_bus_message_get_bus(m));
1880
1881         return 0;
1882 }
1883
1884 static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1885         const char *path, *unit, *result;
1886         BusWaitForJobs *d = userdata;
1887         uint32_t id;
1888         char *found;
1889         int r;
1890
1891         assert(m);
1892         assert(d);
1893
1894         r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result);
1895         if (r < 0) {
1896                 bus_log_parse_error(r);
1897                 return 0;
1898         }
1899
1900         found = set_remove(d->jobs, (char*) path);
1901         if (!found)
1902                 return 0;
1903
1904         free(found);
1905
1906         if (!isempty(result))
1907                 d->result = strdup(result);
1908
1909         if (!isempty(unit))
1910                 d->name = strdup(unit);
1911
1912         return 0;
1913 }
1914
1915 void bus_wait_for_jobs_free(BusWaitForJobs *d) {
1916         if (!d)
1917                 return;
1918
1919         set_free_free(d->jobs);
1920
1921         sd_bus_slot_unref(d->slot_disconnected);
1922         sd_bus_slot_unref(d->slot_job_removed);
1923
1924         sd_bus_unref(d->bus);
1925
1926         free(d->name);
1927         free(d->result);
1928
1929         free(d);
1930 }
1931
1932 int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret) {
1933         _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *d = NULL;
1934         int r;
1935
1936         assert(bus);
1937         assert(ret);
1938
1939         d = new0(BusWaitForJobs, 1);
1940         if (!d)
1941                 return -ENOMEM;
1942
1943         d->bus = sd_bus_ref(bus);
1944
1945         /* When we are a bus client we match by sender. Direct
1946          * connections OTOH have no initialized sender field, and
1947          * hence we ignore the sender then */
1948         r = sd_bus_add_match(
1949                         bus,
1950                         &d->slot_job_removed,
1951                         bus->bus_client ?
1952                         "type='signal',"
1953                         "sender='org.freedesktop.systemd1',"
1954                         "interface='org.freedesktop.systemd1.Manager',"
1955                         "member='JobRemoved',"
1956                         "path='/org/freedesktop/systemd1'" :
1957                         "type='signal',"
1958                         "interface='org.freedesktop.systemd1.Manager',"
1959                         "member='JobRemoved',"
1960                         "path='/org/freedesktop/systemd1'",
1961                         match_job_removed, d);
1962         if (r < 0)
1963                 return r;
1964
1965         r = sd_bus_add_match(
1966                         bus,
1967                         &d->slot_disconnected,
1968                         "type='signal',"
1969                         "sender='org.freedesktop.DBus.Local',"
1970                         "interface='org.freedesktop.DBus.Local',"
1971                         "member='Disconnected'",
1972                         match_disconnected, d);
1973         if (r < 0)
1974                 return r;
1975
1976         *ret = d;
1977         d = NULL;
1978
1979         return 0;
1980 }
1981
1982 static int bus_process_wait(sd_bus *bus) {
1983         int r;
1984
1985         for (;;) {
1986                 r = sd_bus_process(bus, NULL);
1987                 if (r < 0)
1988                         return r;
1989                 if (r > 0)
1990                         return 0;
1991
1992                 r = sd_bus_wait(bus, (uint64_t) -1);
1993                 if (r < 0)
1994                         return r;
1995         }
1996 }
1997
1998 static int bus_job_get_service_result(BusWaitForJobs *d, char **result) {
1999         _cleanup_free_ char *dbus_path = NULL;
2000
2001         assert(d);
2002         assert(d->name);
2003         assert(result);
2004
2005         dbus_path = unit_dbus_path_from_name(d->name);
2006         if (!dbus_path)
2007                 return -ENOMEM;
2008
2009         return sd_bus_get_property_string(d->bus,
2010                                           "org.freedesktop.systemd1",
2011                                           dbus_path,
2012                                           "org.freedesktop.systemd1.Service",
2013                                           "Result",
2014                                           NULL,
2015                                           result);
2016 }
2017
2018 static const struct {
2019         const char *result, *explanation;
2020 } explanations [] = {
2021         { "resources",   "a configured resource limit was exceeded" },
2022         { "timeout",     "a timeout was exceeded" },
2023         { "exit-code",   "the control process exited with error code" },
2024         { "signal",      "a fatal signal was delivered to the control process" },
2025         { "core-dump",   "a fatal signal was delivered causing the control process to dump core" },
2026         { "watchdog",    "the service failed to send watchdog ping" },
2027         { "start-limit", "start of the service was attempted too often" }
2028 };
2029
2030 static void log_job_error_with_service_result(const char* service, const char *result, const char *extra_args) {
2031         _cleanup_free_ char *service_shell_quoted = NULL, *systemctl_extra_args = NULL;
2032
2033         assert(service);
2034
2035         service_shell_quoted = shell_maybe_quote(service);
2036
2037         systemctl_extra_args = strjoin("systemctl ", extra_args, " ", NULL);
2038         if (!systemctl_extra_args) {
2039                 log_oom();
2040                 return;
2041         }
2042
2043         systemctl_extra_args = strstrip(systemctl_extra_args);
2044
2045         if (!isempty(result)) {
2046                 unsigned i;
2047
2048                 for (i = 0; i < ELEMENTSOF(explanations); ++i)
2049                         if (streq(result, explanations[i].result))
2050                                 break;
2051
2052                 if (i < ELEMENTSOF(explanations)) {
2053                         log_error("Job for %s failed because %s. See \"%s status %s\" and \"journalctl -xe\" for details.\n",
2054                                   service,
2055                                   explanations[i].explanation,
2056                                   systemctl_extra_args,
2057                                   strna(service_shell_quoted));
2058
2059                         goto finish;
2060                 }
2061         }
2062
2063         log_error("Job for %s failed. See \"%s status %s\" and \"journalctl -xe\" for details.\n",
2064                   service,
2065                   systemctl_extra_args,
2066                   strna(service_shell_quoted));
2067
2068 finish:
2069         /* For some results maybe additional explanation is required */
2070         if (streq_ptr(result, "start-limit"))
2071                 log_info("To force a start use \"%1$s reset-failed %2$s\" followed by \"%1$s start %2$s\" again.",
2072                          systemctl_extra_args,
2073                          strna(service_shell_quoted));
2074 }
2075
2076 static int check_wait_response(BusWaitForJobs *d, bool quiet, const char *extra_args) {
2077         int r = 0;
2078
2079         assert(d->result);
2080
2081         if (!quiet) {
2082                 if (streq(d->result, "canceled"))
2083                         log_error("Job for %s canceled.", strna(d->name));
2084                 else if (streq(d->result, "timeout"))
2085                         log_error("Job for %s timed out.", strna(d->name));
2086                 else if (streq(d->result, "dependency"))
2087                         log_error("A dependency job for %s failed. See 'journalctl -xe' for details.", strna(d->name));
2088                 else if (streq(d->result, "invalid"))
2089                         log_error("%s is not active, cannot reload.", strna(d->name));
2090                 else if (streq(d->result, "assert"))
2091                         log_error("Assertion failed on job for %s.", strna(d->name));
2092                 else if (streq(d->result, "unsupported"))
2093                         log_error("Operation on or unit type of %s not supported on this system.", strna(d->name));
2094                 else if (!streq(d->result, "done") && !streq(d->result, "skipped")) {
2095                         if (d->name) {
2096                                 int q;
2097                                 _cleanup_free_ char *result = NULL;
2098
2099                                 q = bus_job_get_service_result(d, &result);
2100                                 if (q < 0)
2101                                         log_debug_errno(q, "Failed to get Result property of service %s: %m", d->name);
2102
2103                                 log_job_error_with_service_result(d->name, result, extra_args);
2104                         } else
2105                                 log_error("Job failed. See \"journalctl -xe\" for details.");
2106                 }
2107         }
2108
2109         if (streq(d->result, "canceled"))
2110                 r = -ECANCELED;
2111         else if (streq(d->result, "timeout"))
2112                 r = -ETIME;
2113         else if (streq(d->result, "dependency"))
2114                 r = -EIO;
2115         else if (streq(d->result, "invalid"))
2116                 r = -ENOEXEC;
2117         else if (streq(d->result, "assert"))
2118                 r = -EPROTO;
2119         else if (streq(d->result, "unsupported"))
2120                 r = -EOPNOTSUPP;
2121         else if (!streq(d->result, "done") && !streq(d->result, "skipped"))
2122                 r = -EIO;
2123
2124         return r;
2125 }
2126
2127 int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet, const char *extra_args) {
2128         int r = 0;
2129
2130         assert(d);
2131
2132         while (!set_isempty(d->jobs)) {
2133                 int q;
2134
2135                 q = bus_process_wait(d->bus);
2136                 if (q < 0)
2137                         return log_error_errno(q, "Failed to wait for response: %m");
2138
2139                 if (d->result) {
2140                         q = check_wait_response(d, quiet, extra_args);
2141                         /* Return the first error as it is most likely to be
2142                          * meaningful. */
2143                         if (q < 0 && r == 0)
2144                                 r = q;
2145
2146                         log_debug_errno(q, "Got result %s/%m for job %s", strna(d->result), strna(d->name));
2147                 }
2148
2149                 d->name = mfree(d->name);
2150                 d->result = mfree(d->result);
2151         }
2152
2153         return r;
2154 }
2155
2156 int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) {
2157         int r;
2158
2159         assert(d);
2160
2161         r = set_ensure_allocated(&d->jobs, &string_hash_ops);
2162         if (r < 0)
2163                 return r;
2164
2165         return set_put_strdup(d->jobs, path);
2166 }
2167
2168 int bus_wait_for_jobs_one(BusWaitForJobs *d, const char *path, bool quiet) {
2169         int r;
2170
2171         r = bus_wait_for_jobs_add(d, path);
2172         if (r < 0)
2173                 return log_oom();
2174
2175         return bus_wait_for_jobs(d, quiet, NULL);
2176 }
2177
2178 int bus_deserialize_and_dump_unit_file_changes(sd_bus_message *m, bool quiet, UnitFileChange **changes, unsigned *n_changes) {
2179         const char *type, *path, *source;
2180         int r;
2181
2182         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(sss)");
2183         if (r < 0)
2184                 return bus_log_parse_error(r);
2185
2186         while ((r = sd_bus_message_read(m, "(sss)", &type, &path, &source)) > 0) {
2187                 if (!quiet) {
2188                         if (streq(type, "symlink"))
2189                                 log_info("Created symlink from %s to %s.", path, source);
2190                         else
2191                                 log_info("Removed symlink %s.", path);
2192                 }
2193
2194                 r = unit_file_changes_add(changes, n_changes, streq(type, "symlink") ? UNIT_FILE_SYMLINK : UNIT_FILE_UNLINK, path, source);
2195                 if (r < 0)
2196                         return r;
2197         }
2198         if (r < 0)
2199                 return bus_log_parse_error(r);
2200
2201         r = sd_bus_message_exit_container(m);
2202         if (r < 0)
2203                 return bus_log_parse_error(r);
2204
2205         return 0;
2206 }
2207
2208 /**
2209  * bus_path_encode_unique() - encode unique object path
2210  * @b: bus connection or NULL
2211  * @prefix: object path prefix
2212  * @sender_id: unique-name of client, or NULL
2213  * @external_id: external ID to be chosen by client, or NULL
2214  * @ret_path: storage for encoded object path pointer
2215  *
2216  * Whenever we provide a bus API that allows clients to create and manage
2217  * server-side objects, we need to provide a unique name for these objects. If
2218  * we let the server choose the name, we suffer from a race condition: If a
2219  * client creates an object asynchronously, it cannot destroy that object until
2220  * it received the method reply. It cannot know the name of the new object,
2221  * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
2222  *
2223  * Therefore, many APIs allow the client to choose the unique name for newly
2224  * created objects. There're two problems to solve, though:
2225  *    1) Object names are usually defined via dbus object paths, which are
2226  *       usually globally namespaced. Therefore, multiple clients must be able
2227  *       to choose unique object names without interference.
2228  *    2) If multiple libraries share the same bus connection, they must be
2229  *       able to choose unique object names without interference.
2230  * The first problem is solved easily by prefixing a name with the
2231  * unique-bus-name of a connection. The server side must enforce this and
2232  * reject any other name. The second problem is solved by providing unique
2233  * suffixes from within sd-bus.
2234  *
2235  * This helper allows clients to create unique object-paths. It uses the
2236  * template '/prefix/sender_id/external_id' and returns the new path in
2237  * @ret_path (must be freed by the caller).
2238  * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
2239  * NULL, this function allocates a unique suffix via @b (by requesting a new
2240  * cookie). If both @sender_id and @external_id are given, @b can be passed as
2241  * NULL.
2242  *
2243  * Returns: 0 on success, negative error code on failure.
2244  */
2245 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
2246         _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
2247         char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
2248         int r;
2249
2250         assert_return(b || (sender_id && external_id), -EINVAL);
2251         assert_return(object_path_is_valid(prefix), -EINVAL);
2252         assert_return(ret_path, -EINVAL);
2253
2254         if (!sender_id) {
2255                 r = sd_bus_get_unique_name(b, &sender_id);
2256                 if (r < 0)
2257                         return r;
2258         }
2259
2260         if (!external_id) {
2261                 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
2262                 external_id = external_buf;
2263         }
2264
2265         sender_label = bus_label_escape(sender_id);
2266         if (!sender_label)
2267                 return -ENOMEM;
2268
2269         external_label = bus_label_escape(external_id);
2270         if (!external_label)
2271                 return -ENOMEM;
2272
2273         p = strjoin(prefix, "/", sender_label, "/", external_label, NULL);
2274         if (!p)
2275                 return -ENOMEM;
2276
2277         *ret_path = p;
2278         return 0;
2279 }
2280
2281 /**
2282  * bus_path_decode_unique() - decode unique object path
2283  * @path: object path to decode
2284  * @prefix: object path prefix
2285  * @ret_sender: output parameter for sender-id label
2286  * @ret_external: output parameter for external-id label
2287  *
2288  * This does the reverse of bus_path_encode_unique() (see its description for
2289  * details). Both trailing labels, sender-id and external-id, are unescaped and
2290  * returned in the given output parameters (the caller must free them).
2291  *
2292  * Note that this function returns 0 if the path does not match the template
2293  * (see bus_path_encode_unique()), 1 if it matched.
2294  *
2295  * Returns: Negative error code on failure, 0 if the given object path does not
2296  *          match the template (return parameters are set to NULL), 1 if it was
2297  *          parsed successfully (return parameters contain allocated labels).
2298  */
2299 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
2300         const char *p, *q;
2301         char *sender, *external;
2302
2303         assert(object_path_is_valid(path));
2304         assert(object_path_is_valid(prefix));
2305         assert(ret_sender);
2306         assert(ret_external);
2307
2308         p = object_path_startswith(path, prefix);
2309         if (!p) {
2310                 *ret_sender = NULL;
2311                 *ret_external = NULL;
2312                 return 0;
2313         }
2314
2315         q = strchr(p, '/');
2316         if (!q) {
2317                 *ret_sender = NULL;
2318                 *ret_external = NULL;
2319                 return 0;
2320         }
2321
2322         sender = bus_label_unescape_n(p, q - p);
2323         external = bus_label_unescape(q + 1);
2324         if (!sender || !external) {
2325                 free(sender);
2326                 free(external);
2327                 return -ENOMEM;
2328         }
2329
2330         *ret_sender = sender;
2331         *ret_external = external;
2332         return 1;
2333 }
2334 #endif // 0
2335
2336 bool is_kdbus_wanted(void) {
2337         _cleanup_free_ char *value = NULL;
2338 #ifdef ENABLE_KDBUS
2339         const bool configured = true;
2340 #else
2341         const bool configured = false;
2342 #endif
2343
2344         int r;
2345
2346         if (get_proc_cmdline_key("kdbus", NULL) > 0)
2347                 return true;
2348
2349         r = get_proc_cmdline_key("kdbus=", &value);
2350         if (r <= 0)
2351                 return configured;
2352
2353         return parse_boolean(value) == 1;
2354 }
2355
2356 bool is_kdbus_available(void) {
2357         _cleanup_close_ int fd = -1;
2358         struct kdbus_cmd cmd = { .size = sizeof(cmd), .flags = KDBUS_FLAG_NEGOTIATE };
2359
2360         if (!is_kdbus_wanted())
2361                 return false;
2362
2363         fd = open("/sys/fs/kdbus/control", O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
2364         if (fd < 0)
2365                 return false;
2366
2367         return ioctl(fd, KDBUS_CMD_BUS_MAKE, &cmd) >= 0;
2368 }
2369
2370 #if 0 /// UNNEEDED by elogind
2371 int bus_property_get_rlimit(
2372                 sd_bus *bus,
2373                 const char *path,
2374                 const char *interface,
2375                 const char *property,
2376                 sd_bus_message *reply,
2377                 void *userdata,
2378                 sd_bus_error *error) {
2379
2380         struct rlimit *rl;
2381         uint64_t u;
2382         rlim_t x;
2383         const char *is_soft;
2384
2385         assert(bus);
2386         assert(reply);
2387         assert(userdata);
2388
2389         is_soft = endswith(property, "Soft");
2390         rl = *(struct rlimit**) userdata;
2391         if (rl)
2392                 x = is_soft ? rl->rlim_cur : rl->rlim_max;
2393         else {
2394                 struct rlimit buf = {};
2395                 int z;
2396                 const char *s;
2397
2398                 s = is_soft ? strndupa(property, is_soft - property) : property;
2399
2400                 z = rlimit_from_string(strstr(s, "Limit"));
2401                 assert(z >= 0);
2402
2403                 getrlimit(z, &buf);
2404                 x = is_soft ? buf.rlim_cur : buf.rlim_max;
2405         }
2406
2407         /* rlim_t might have different sizes, let's map
2408          * RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on
2409          * all archs */
2410         u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
2411
2412         return sd_bus_message_append(reply, "t", u);
2413 }
2414 #endif // 0