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
1443         } else if (streq(field, "EnvironmentFile")) {
1444
1445                 r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, "EnvironmentFiles");
1446                 if (r < 0)
1447                         return bus_log_create_error(r);
1448
1449                 r = sd_bus_message_append(m, "v", "a(sb)", 1,
1450                                           eq[0] == '-' ? eq + 1 : eq,
1451                                           eq[0] == '-');
1452                 if (r < 0)
1453                         return bus_log_create_error(r);
1454
1455                 return 0;
1456
1457         } else if (STR_IN_SET(field, "AccuracySec", "RandomizedDelaySec")) {
1458                 char *n;
1459                 usec_t t;
1460                 size_t l;
1461                 r = parse_sec(eq, &t);
1462                 if (r < 0)
1463                         return log_error_errno(r, "Failed to parse %s= parameter: %s", field, eq);
1464
1465                 l = strlen(field);
1466                 n = newa(char, l + 2);
1467                 if (!n)
1468                         return log_oom();
1469
1470                 /* Change suffix Sec → USec */
1471                 strcpy(mempcpy(n, field, l - 3), "USec");
1472                 r = sd_bus_message_append(m, "sv", n, "t", t);
1473                 if (r < 0)
1474                         return bus_log_create_error(r);
1475
1476                 return 0;
1477         }
1478
1479         r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, field);
1480         if (r < 0)
1481                 return bus_log_create_error(r);
1482
1483         if (STR_IN_SET(field,
1484                        "CPUAccounting", "MemoryAccounting", "BlockIOAccounting", "TasksAccounting",
1485                        "SendSIGHUP", "SendSIGKILL", "WakeSystem", "DefaultDependencies",
1486                        "IgnoreSIGPIPE", "TTYVHangup", "TTYReset", "RemainAfterExit",
1487                        "PrivateTmp", "PrivateDevices", "PrivateNetwork", "NoNewPrivileges",
1488                        "SyslogLevelPrefix", "Delegate", "RemainAfterElapse")) {
1489
1490                 r = parse_boolean(eq);
1491                 if (r < 0)
1492                         return log_error_errno(r, "Failed to parse boolean assignment %s.", assignment);
1493
1494                 r = sd_bus_message_append(m, "v", "b", r);
1495
1496         } else if (streq(field, "MemoryLimit")) {
1497                 uint64_t bytes;
1498
1499                 if (isempty(eq) || streq(eq, "infinity"))
1500                         bytes = (uint64_t) -1;
1501                 else {
1502                 r = parse_size(eq, 1024, &bytes);
1503                 if (r < 0) {
1504                         log_error("Failed to parse bytes specification %s", assignment);
1505                         return -EINVAL;
1506                 }
1507                 }
1508
1509                 r = sd_bus_message_append(m, "v", "t", bytes);
1510
1511         } else if (streq(field, "TasksMax")) {
1512                 uint64_t n;
1513
1514                 if (isempty(eq) || streq(eq, "infinity"))
1515                         n = (uint64_t) -1;
1516                 else {
1517                         r = safe_atou64(eq, &n);
1518                         if (r < 0) {
1519                                 log_error("Failed to parse maximum tasks specification %s", assignment);
1520                                 return -EINVAL;
1521                         }
1522                 }
1523
1524                 r = sd_bus_message_append(m, "v", "t", n);
1525
1526         } else if (STR_IN_SET(field, "CPUShares", "StartupCPUShares")) {
1527                 uint64_t u;
1528
1529                 r = cg_cpu_shares_parse(eq, &u);
1530                 if (r < 0) {
1531                         log_error("Failed to parse %s value %s.", field, eq);
1532                         return -EINVAL;
1533                 }
1534
1535                 r = sd_bus_message_append(m, "v", "t", u);
1536
1537         } else if (STR_IN_SET(field, "BlockIOWeight", "StartupBlockIOWeight")) {
1538                 uint64_t u;
1539
1540                 r = cg_cpu_shares_parse(eq, &u);
1541                 if (r < 0) {
1542                         log_error("Failed to parse %s value %s.", field, eq);
1543                         return -EINVAL;
1544                 }
1545
1546                 r = sd_bus_message_append(m, "v", "t", u);
1547
1548         } else if (STR_IN_SET(field,
1549                               "User", "Group", "DevicePolicy", "KillMode",
1550                               "UtmpIdentifier", "UtmpMode", "PAMName", "TTYPath",
1551                               "StandardInput", "StandardOutput", "StandardError",
1552                               "Description", "Slice", "Type", "WorkingDirectory",
1553                               "RootDirectory", "SyslogIdentifier", "ProtectSystem",
1554                               "ProtectHome"))
1555                 r = sd_bus_message_append(m, "v", "s", eq);
1556
1557         else if (streq(field, "SyslogLevel")) {
1558                 int level;
1559
1560                 level = log_level_from_string(eq);
1561                 if (level < 0) {
1562                         log_error("Failed to parse %s value %s.", field, eq);
1563                         return -EINVAL;
1564                 }
1565
1566                 r = sd_bus_message_append(m, "v", "i", level);
1567
1568         } else if (streq(field, "SyslogFacility")) {
1569                 int facility;
1570
1571                 facility = log_facility_unshifted_from_string(eq);
1572                 if (facility < 0) {
1573                         log_error("Failed to parse %s value %s.", field, eq);
1574                         return -EINVAL;
1575                 }
1576
1577                 r = sd_bus_message_append(m, "v", "i", facility);
1578
1579         } else if (streq(field, "DeviceAllow")) {
1580
1581                 if (isempty(eq))
1582                         r = sd_bus_message_append(m, "v", "a(ss)", 0);
1583                 else {
1584                         const char *path, *rwm, *e;
1585
1586                         e = strchr(eq, ' ');
1587                         if (e) {
1588                                 path = strndupa(eq, e - eq);
1589                                 rwm = e+1;
1590                         } else {
1591                                 path = eq;
1592                                 rwm = "";
1593                         }
1594
1595                         if (!path_startswith(path, "/dev")) {
1596                                 log_error("%s is not a device file in /dev.", path);
1597                                 return -EINVAL;
1598                         }
1599
1600                         r = sd_bus_message_append(m, "v", "a(ss)", 1, path, rwm);
1601                 }
1602
1603         } else if (STR_IN_SET(field, "BlockIOReadBandwidth", "BlockIOWriteBandwidth")) {
1604
1605                 if (isempty(eq))
1606                         r = sd_bus_message_append(m, "v", "a(st)", 0);
1607                 else {
1608                         const char *path, *bandwidth, *e;
1609                         uint64_t bytes;
1610
1611                         e = strchr(eq, ' ');
1612                         if (e) {
1613                                 path = strndupa(eq, e - eq);
1614                                 bandwidth = e+1;
1615                         } else {
1616                                 log_error("Failed to parse %s value %s.", field, eq);
1617                                 return -EINVAL;
1618                         }
1619
1620                         if (!path_startswith(path, "/dev")) {
1621                                 log_error("%s is not a device file in /dev.", path);
1622                                 return -EINVAL;
1623                         }
1624
1625                         r = parse_size(bandwidth, 1000, &bytes);
1626                         if (r < 0) {
1627                                 log_error("Failed to parse byte value %s.", bandwidth);
1628                                 return -EINVAL;
1629                         }
1630
1631                         r = sd_bus_message_append(m, "v", "a(st)", 1, path, bytes);
1632                 }
1633
1634         } else if (streq(field, "BlockIODeviceWeight")) {
1635
1636                 if (isempty(eq))
1637                         r = sd_bus_message_append(m, "v", "a(st)", 0);
1638                 else {
1639                         const char *path, *weight, *e;
1640                         uint64_t u;
1641
1642                         e = strchr(eq, ' ');
1643                         if (e) {
1644                                 path = strndupa(eq, e - eq);
1645                                 weight = e+1;
1646                         } else {
1647                                 log_error("Failed to parse %s value %s.", field, eq);
1648                                 return -EINVAL;
1649                         }
1650
1651                         if (!path_startswith(path, "/dev")) {
1652                                 log_error("%s is not a device file in /dev.", path);
1653                                 return -EINVAL;
1654                         }
1655
1656                         r = safe_atou64(weight, &u);
1657                         if (r < 0) {
1658                                 log_error("Failed to parse %s value %s.", field, weight);
1659                                 return -EINVAL;
1660                         }
1661                         r = sd_bus_message_append(m, "v", "a(st)", path, u);
1662                 }
1663
1664         } else if (rlimit_from_string(field) >= 0) {
1665                 uint64_t rl;
1666
1667                 if (streq(eq, "infinity"))
1668                         rl = (uint64_t) -1;
1669                 else {
1670                         r = safe_atou64(eq, &rl);
1671                         if (r < 0) {
1672                                 log_error("Invalid resource limit: %s", eq);
1673                                 return -EINVAL;
1674                         }
1675                 }
1676
1677                 r = sd_bus_message_append(m, "v", "t", rl);
1678
1679         } else if (streq(field, "Nice")) {
1680                 int32_t i;
1681
1682                 r = safe_atoi32(eq, &i);
1683                 if (r < 0) {
1684                         log_error("Failed to parse %s value %s.", field, eq);
1685                         return -EINVAL;
1686                 }
1687
1688                 r = sd_bus_message_append(m, "v", "i", i);
1689
1690         } else if (STR_IN_SET(field, "Environment", "PassEnvironment")) {
1691                 const char *p;
1692
1693                 r = sd_bus_message_open_container(m, 'v', "as");
1694                 if (r < 0)
1695                         return bus_log_create_error(r);
1696
1697                 r = sd_bus_message_open_container(m, 'a', "s");
1698                 if (r < 0)
1699                         return bus_log_create_error(r);
1700
1701                 p = eq;
1702
1703                 for (;;) {
1704                         _cleanup_free_ char *word = NULL;
1705
1706                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
1707                         if (r < 0) {
1708                                 log_error("Failed to parse Environment value %s", eq);
1709                                 return -EINVAL;
1710                         }
1711                         if (r == 0)
1712                                 break;
1713
1714                         if (streq(field, "Environment")) {
1715                                 if (!env_assignment_is_valid(word)) {
1716                                         log_error("Invalid environment assignment: %s", word);
1717                                         return -EINVAL;
1718                                 }
1719                         } else {  /* PassEnvironment */
1720                                 if (!env_name_is_valid(word)) {
1721                                         log_error("Invalid environment variable name: %s", word);
1722                                         return -EINVAL;
1723                                 }
1724                         }
1725
1726                         r = sd_bus_message_append_basic(m, 's', word);
1727                         if (r < 0)
1728                                 return bus_log_create_error(r);
1729                 }
1730
1731                 r = sd_bus_message_close_container(m);
1732                 if (r < 0)
1733                         return bus_log_create_error(r);
1734
1735                 r = sd_bus_message_close_container(m);
1736
1737         } else if (streq(field, "KillSignal")) {
1738                 int sig;
1739
1740                 sig = signal_from_string_try_harder(eq);
1741                 if (sig < 0) {
1742                         log_error("Failed to parse %s value %s.", field, eq);
1743                         return -EINVAL;
1744                 }
1745
1746                 r = sd_bus_message_append(m, "v", "i", sig);
1747
1748         } else if (streq(field, "TimerSlackNSec")) {
1749                 nsec_t n;
1750
1751                 r = parse_nsec(eq, &n);
1752                 if (r < 0) {
1753                         log_error("Failed to parse %s value %s", field, eq);
1754                         return -EINVAL;
1755                 }
1756
1757                 r = sd_bus_message_append(m, "v", "t", n);
1758         } else if (streq(field, "OOMScoreAdjust")) {
1759                 int oa;
1760
1761                 r = safe_atoi(eq, &oa);
1762                 if (r < 0) {
1763                         log_error("Failed to parse %s value %s", field, eq);
1764                         return -EINVAL;
1765                 }
1766
1767                 if (!oom_score_adjust_is_valid(oa)) {
1768                         log_error("OOM score adjust value out of range");
1769                         return -EINVAL;
1770                 }
1771
1772                 r = sd_bus_message_append(m, "v", "i", oa);
1773         } else if (STR_IN_SET(field, "ReadWriteDirectories", "ReadOnlyDirectories", "InaccessibleDirectories")) {
1774                 const char *p;
1775
1776                 r = sd_bus_message_open_container(m, 'v', "as");
1777                 if (r < 0)
1778                         return bus_log_create_error(r);
1779
1780                 r = sd_bus_message_open_container(m, 'a', "s");
1781                 if (r < 0)
1782                         return bus_log_create_error(r);
1783
1784                 p = eq;
1785
1786                 for (;;) {
1787                         _cleanup_free_ char *word = NULL;
1788                         int offset;
1789
1790                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);
1791                         if (r < 0) {
1792                                 log_error("Failed to parse %s value %s", field, eq);
1793                                 return -EINVAL;
1794                         }
1795                         if (r == 0)
1796                                 break;
1797
1798                         if (!utf8_is_valid(word)) {
1799                                 log_error("Failed to parse %s value %s", field, eq);
1800                                 return -EINVAL;
1801                         }
1802
1803                         offset = word[0] == '-';
1804                         if (!path_is_absolute(word + offset)) {
1805                                 log_error("Failed to parse %s value %s", field, eq);
1806                                 return -EINVAL;
1807                         }
1808
1809                         path_kill_slashes(word + offset);
1810
1811                         r = sd_bus_message_append_basic(m, 's', word);
1812                         if (r < 0)
1813                                 return bus_log_create_error(r);
1814                 }
1815
1816                 r = sd_bus_message_close_container(m);
1817                 if (r < 0)
1818                         return bus_log_create_error(r);
1819
1820                 r = sd_bus_message_close_container(m);
1821
1822         } else if (streq(field, "RuntimeDirectory")) {
1823                 const char *p;
1824
1825                 r = sd_bus_message_open_container(m, 'v', "as");
1826                 if (r < 0)
1827                         return bus_log_create_error(r);
1828
1829                 r = sd_bus_message_open_container(m, 'a', "s");
1830                 if (r < 0)
1831                         return bus_log_create_error(r);
1832
1833                 p = eq;
1834
1835                 for (;;) {
1836                         _cleanup_free_ char *word = NULL;
1837
1838                         r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);
1839                         if (r < 0)
1840                                 return log_error_errno(r, "Failed to parse %s value %s", field, eq);
1841
1842                         if (r == 0)
1843                                 break;
1844
1845                         r = sd_bus_message_append_basic(m, 's', word);
1846                         if (r < 0)
1847                                 return bus_log_create_error(r);
1848                 }
1849
1850                 r = sd_bus_message_close_container(m);
1851                 if (r < 0)
1852                         return bus_log_create_error(r);
1853
1854                 r = sd_bus_message_close_container(m);
1855
1856         } else {
1857                 log_error("Unknown assignment %s.", assignment);
1858                 return -EINVAL;
1859         }
1860
1861         if (r < 0)
1862                 return bus_log_create_error(r);
1863
1864         return 0;
1865 }
1866 #endif // 0
1867
1868 typedef struct BusWaitForJobs {
1869         sd_bus *bus;
1870         Set *jobs;
1871
1872         char *name;
1873         char *result;
1874
1875         sd_bus_slot *slot_job_removed;
1876         sd_bus_slot *slot_disconnected;
1877 } BusWaitForJobs;
1878
1879 #if 0 /// UNNEEDED by elogind
1880 static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1881         assert(m);
1882
1883         log_error("Warning! D-Bus connection terminated.");
1884         sd_bus_close(sd_bus_message_get_bus(m));
1885
1886         return 0;
1887 }
1888
1889 static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1890         const char *path, *unit, *result;
1891         BusWaitForJobs *d = userdata;
1892         uint32_t id;
1893         char *found;
1894         int r;
1895
1896         assert(m);
1897         assert(d);
1898
1899         r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result);
1900         if (r < 0) {
1901                 bus_log_parse_error(r);
1902                 return 0;
1903         }
1904
1905         found = set_remove(d->jobs, (char*) path);
1906         if (!found)
1907                 return 0;
1908
1909         free(found);
1910
1911         if (!isempty(result))
1912                 d->result = strdup(result);
1913
1914         if (!isempty(unit))
1915                 d->name = strdup(unit);
1916
1917         return 0;
1918 }
1919
1920 void bus_wait_for_jobs_free(BusWaitForJobs *d) {
1921         if (!d)
1922                 return;
1923
1924         set_free_free(d->jobs);
1925
1926         sd_bus_slot_unref(d->slot_disconnected);
1927         sd_bus_slot_unref(d->slot_job_removed);
1928
1929         sd_bus_unref(d->bus);
1930
1931         free(d->name);
1932         free(d->result);
1933
1934         free(d);
1935 }
1936
1937 int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret) {
1938         _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *d = NULL;
1939         int r;
1940
1941         assert(bus);
1942         assert(ret);
1943
1944         d = new0(BusWaitForJobs, 1);
1945         if (!d)
1946                 return -ENOMEM;
1947
1948         d->bus = sd_bus_ref(bus);
1949
1950         /* When we are a bus client we match by sender. Direct
1951          * connections OTOH have no initialized sender field, and
1952          * hence we ignore the sender then */
1953         r = sd_bus_add_match(
1954                         bus,
1955                         &d->slot_job_removed,
1956                         bus->bus_client ?
1957                         "type='signal',"
1958                         "sender='org.freedesktop.systemd1',"
1959                         "interface='org.freedesktop.systemd1.Manager',"
1960                         "member='JobRemoved',"
1961                         "path='/org/freedesktop/systemd1'" :
1962                         "type='signal',"
1963                         "interface='org.freedesktop.systemd1.Manager',"
1964                         "member='JobRemoved',"
1965                         "path='/org/freedesktop/systemd1'",
1966                         match_job_removed, d);
1967         if (r < 0)
1968                 return r;
1969
1970         r = sd_bus_add_match(
1971                         bus,
1972                         &d->slot_disconnected,
1973                         "type='signal',"
1974                         "sender='org.freedesktop.DBus.Local',"
1975                         "interface='org.freedesktop.DBus.Local',"
1976                         "member='Disconnected'",
1977                         match_disconnected, d);
1978         if (r < 0)
1979                 return r;
1980
1981         *ret = d;
1982         d = NULL;
1983
1984         return 0;
1985 }
1986
1987 static int bus_process_wait(sd_bus *bus) {
1988         int r;
1989
1990         for (;;) {
1991                 r = sd_bus_process(bus, NULL);
1992                 if (r < 0)
1993                         return r;
1994                 if (r > 0)
1995                         return 0;
1996
1997                 r = sd_bus_wait(bus, (uint64_t) -1);
1998                 if (r < 0)
1999                         return r;
2000         }
2001 }
2002
2003 static int bus_job_get_service_result(BusWaitForJobs *d, char **result) {
2004         _cleanup_free_ char *dbus_path = NULL;
2005
2006         assert(d);
2007         assert(d->name);
2008         assert(result);
2009
2010         dbus_path = unit_dbus_path_from_name(d->name);
2011         if (!dbus_path)
2012                 return -ENOMEM;
2013
2014         return sd_bus_get_property_string(d->bus,
2015                                           "org.freedesktop.systemd1",
2016                                           dbus_path,
2017                                           "org.freedesktop.systemd1.Service",
2018                                           "Result",
2019                                           NULL,
2020                                           result);
2021 }
2022
2023 static const struct {
2024         const char *result, *explanation;
2025 } explanations [] = {
2026         { "resources",   "a configured resource limit was exceeded" },
2027         { "timeout",     "a timeout was exceeded" },
2028         { "exit-code",   "the control process exited with error code" },
2029         { "signal",      "a fatal signal was delivered to the control process" },
2030         { "core-dump",   "a fatal signal was delivered causing the control process to dump core" },
2031         { "watchdog",    "the service failed to send watchdog ping" },
2032         { "start-limit", "start of the service was attempted too often" }
2033 };
2034
2035 static void log_job_error_with_service_result(const char* service, const char *result, const char *extra_args) {
2036         _cleanup_free_ char *service_shell_quoted = NULL, *systemctl_extra_args = NULL;
2037
2038         assert(service);
2039
2040         service_shell_quoted = shell_maybe_quote(service);
2041
2042         systemctl_extra_args = strjoin("systemctl ", extra_args, " ", NULL);
2043         if (!systemctl_extra_args) {
2044                 log_oom();
2045                 return;
2046         }
2047
2048         systemctl_extra_args = strstrip(systemctl_extra_args);
2049
2050         if (!isempty(result)) {
2051                 unsigned i;
2052
2053                 for (i = 0; i < ELEMENTSOF(explanations); ++i)
2054                         if (streq(result, explanations[i].result))
2055                                 break;
2056
2057                 if (i < ELEMENTSOF(explanations)) {
2058                         log_error("Job for %s failed because %s. See \"%s status %s\" and \"journalctl -xe\" for details.\n",
2059                                   service,
2060                                   explanations[i].explanation,
2061                                   systemctl_extra_args,
2062                                   strna(service_shell_quoted));
2063
2064                         goto finish;
2065                 }
2066         }
2067
2068         log_error("Job for %s failed. See \"%s status %s\" and \"journalctl -xe\" for details.\n",
2069                   service,
2070                   systemctl_extra_args,
2071                   strna(service_shell_quoted));
2072
2073 finish:
2074         /* For some results maybe additional explanation is required */
2075         if (streq_ptr(result, "start-limit"))
2076                 log_info("To force a start use \"%1$s reset-failed %2$s\" followed by \"%1$s start %2$s\" again.",
2077                          systemctl_extra_args,
2078                          strna(service_shell_quoted));
2079 }
2080
2081 static int check_wait_response(BusWaitForJobs *d, bool quiet, const char *extra_args) {
2082         int r = 0;
2083
2084         assert(d->result);
2085
2086         if (!quiet) {
2087                 if (streq(d->result, "canceled"))
2088                         log_error("Job for %s canceled.", strna(d->name));
2089                 else if (streq(d->result, "timeout"))
2090                         log_error("Job for %s timed out.", strna(d->name));
2091                 else if (streq(d->result, "dependency"))
2092                         log_error("A dependency job for %s failed. See 'journalctl -xe' for details.", strna(d->name));
2093                 else if (streq(d->result, "invalid"))
2094                         log_error("%s is not active, cannot reload.", strna(d->name));
2095                 else if (streq(d->result, "assert"))
2096                         log_error("Assertion failed on job for %s.", strna(d->name));
2097                 else if (streq(d->result, "unsupported"))
2098                         log_error("Operation on or unit type of %s not supported on this system.", strna(d->name));
2099                 else if (!streq(d->result, "done") && !streq(d->result, "skipped")) {
2100                         if (d->name) {
2101                                 int q;
2102                                 _cleanup_free_ char *result = NULL;
2103
2104                                 q = bus_job_get_service_result(d, &result);
2105                                 if (q < 0)
2106                                         log_debug_errno(q, "Failed to get Result property of service %s: %m", d->name);
2107
2108                                 log_job_error_with_service_result(d->name, result, extra_args);
2109                         } else
2110                                 log_error("Job failed. See \"journalctl -xe\" for details.");
2111                 }
2112         }
2113
2114         if (streq(d->result, "canceled"))
2115                 r = -ECANCELED;
2116         else if (streq(d->result, "timeout"))
2117                 r = -ETIME;
2118         else if (streq(d->result, "dependency"))
2119                 r = -EIO;
2120         else if (streq(d->result, "invalid"))
2121                 r = -ENOEXEC;
2122         else if (streq(d->result, "assert"))
2123                 r = -EPROTO;
2124         else if (streq(d->result, "unsupported"))
2125                 r = -EOPNOTSUPP;
2126         else if (!streq(d->result, "done") && !streq(d->result, "skipped"))
2127                 r = -EIO;
2128
2129         return r;
2130 }
2131
2132 int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet, const char *extra_args) {
2133         int r = 0;
2134
2135         assert(d);
2136
2137         while (!set_isempty(d->jobs)) {
2138                 int q;
2139
2140                 q = bus_process_wait(d->bus);
2141                 if (q < 0)
2142                         return log_error_errno(q, "Failed to wait for response: %m");
2143
2144                 if (d->result) {
2145                         q = check_wait_response(d, quiet, extra_args);
2146                         /* Return the first error as it is most likely to be
2147                          * meaningful. */
2148                         if (q < 0 && r == 0)
2149                                 r = q;
2150
2151                         log_debug_errno(q, "Got result %s/%m for job %s", strna(d->result), strna(d->name));
2152                 }
2153
2154                 d->name = mfree(d->name);
2155                 d->result = mfree(d->result);
2156         }
2157
2158         return r;
2159 }
2160
2161 int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) {
2162         int r;
2163
2164         assert(d);
2165
2166         r = set_ensure_allocated(&d->jobs, &string_hash_ops);
2167         if (r < 0)
2168                 return r;
2169
2170         return set_put_strdup(d->jobs, path);
2171 }
2172
2173 int bus_wait_for_jobs_one(BusWaitForJobs *d, const char *path, bool quiet) {
2174         int r;
2175
2176         r = bus_wait_for_jobs_add(d, path);
2177         if (r < 0)
2178                 return log_oom();
2179
2180         return bus_wait_for_jobs(d, quiet, NULL);
2181 }
2182
2183 int bus_deserialize_and_dump_unit_file_changes(sd_bus_message *m, bool quiet, UnitFileChange **changes, unsigned *n_changes) {
2184         const char *type, *path, *source;
2185         int r;
2186
2187         r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(sss)");
2188         if (r < 0)
2189                 return bus_log_parse_error(r);
2190
2191         while ((r = sd_bus_message_read(m, "(sss)", &type, &path, &source)) > 0) {
2192                 if (!quiet) {
2193                         if (streq(type, "symlink"))
2194                                 log_info("Created symlink from %s to %s.", path, source);
2195                         else
2196                                 log_info("Removed symlink %s.", path);
2197                 }
2198
2199                 r = unit_file_changes_add(changes, n_changes, streq(type, "symlink") ? UNIT_FILE_SYMLINK : UNIT_FILE_UNLINK, path, source);
2200                 if (r < 0)
2201                         return r;
2202         }
2203         if (r < 0)
2204                 return bus_log_parse_error(r);
2205
2206         r = sd_bus_message_exit_container(m);
2207         if (r < 0)
2208                 return bus_log_parse_error(r);
2209
2210         return 0;
2211 }
2212
2213 /**
2214  * bus_path_encode_unique() - encode unique object path
2215  * @b: bus connection or NULL
2216  * @prefix: object path prefix
2217  * @sender_id: unique-name of client, or NULL
2218  * @external_id: external ID to be chosen by client, or NULL
2219  * @ret_path: storage for encoded object path pointer
2220  *
2221  * Whenever we provide a bus API that allows clients to create and manage
2222  * server-side objects, we need to provide a unique name for these objects. If
2223  * we let the server choose the name, we suffer from a race condition: If a
2224  * client creates an object asynchronously, it cannot destroy that object until
2225  * it received the method reply. It cannot know the name of the new object,
2226  * thus, it cannot destroy it. Furthermore, it enforces a round-trip.
2227  *
2228  * Therefore, many APIs allow the client to choose the unique name for newly
2229  * created objects. There're two problems to solve, though:
2230  *    1) Object names are usually defined via dbus object paths, which are
2231  *       usually globally namespaced. Therefore, multiple clients must be able
2232  *       to choose unique object names without interference.
2233  *    2) If multiple libraries share the same bus connection, they must be
2234  *       able to choose unique object names without interference.
2235  * The first problem is solved easily by prefixing a name with the
2236  * unique-bus-name of a connection. The server side must enforce this and
2237  * reject any other name. The second problem is solved by providing unique
2238  * suffixes from within sd-bus.
2239  *
2240  * This helper allows clients to create unique object-paths. It uses the
2241  * template '/prefix/sender_id/external_id' and returns the new path in
2242  * @ret_path (must be freed by the caller).
2243  * If @sender_id is NULL, the unique-name of @b is used. If @external_id is
2244  * NULL, this function allocates a unique suffix via @b (by requesting a new
2245  * cookie). If both @sender_id and @external_id are given, @b can be passed as
2246  * NULL.
2247  *
2248  * Returns: 0 on success, negative error code on failure.
2249  */
2250 int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) {
2251         _cleanup_free_ char *sender_label = NULL, *external_label = NULL;
2252         char external_buf[DECIMAL_STR_MAX(uint64_t)], *p;
2253         int r;
2254
2255         assert_return(b || (sender_id && external_id), -EINVAL);
2256         assert_return(object_path_is_valid(prefix), -EINVAL);
2257         assert_return(ret_path, -EINVAL);
2258
2259         if (!sender_id) {
2260                 r = sd_bus_get_unique_name(b, &sender_id);
2261                 if (r < 0)
2262                         return r;
2263         }
2264
2265         if (!external_id) {
2266                 xsprintf(external_buf, "%"PRIu64, ++b->cookie);
2267                 external_id = external_buf;
2268         }
2269
2270         sender_label = bus_label_escape(sender_id);
2271         if (!sender_label)
2272                 return -ENOMEM;
2273
2274         external_label = bus_label_escape(external_id);
2275         if (!external_label)
2276                 return -ENOMEM;
2277
2278         p = strjoin(prefix, "/", sender_label, "/", external_label, NULL);
2279         if (!p)
2280                 return -ENOMEM;
2281
2282         *ret_path = p;
2283         return 0;
2284 }
2285
2286 /**
2287  * bus_path_decode_unique() - decode unique object path
2288  * @path: object path to decode
2289  * @prefix: object path prefix
2290  * @ret_sender: output parameter for sender-id label
2291  * @ret_external: output parameter for external-id label
2292  *
2293  * This does the reverse of bus_path_encode_unique() (see its description for
2294  * details). Both trailing labels, sender-id and external-id, are unescaped and
2295  * returned in the given output parameters (the caller must free them).
2296  *
2297  * Note that this function returns 0 if the path does not match the template
2298  * (see bus_path_encode_unique()), 1 if it matched.
2299  *
2300  * Returns: Negative error code on failure, 0 if the given object path does not
2301  *          match the template (return parameters are set to NULL), 1 if it was
2302  *          parsed successfully (return parameters contain allocated labels).
2303  */
2304 int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) {
2305         const char *p, *q;
2306         char *sender, *external;
2307
2308         assert(object_path_is_valid(path));
2309         assert(object_path_is_valid(prefix));
2310         assert(ret_sender);
2311         assert(ret_external);
2312
2313         p = object_path_startswith(path, prefix);
2314         if (!p) {
2315                 *ret_sender = NULL;
2316                 *ret_external = NULL;
2317                 return 0;
2318         }
2319
2320         q = strchr(p, '/');
2321         if (!q) {
2322                 *ret_sender = NULL;
2323                 *ret_external = NULL;
2324                 return 0;
2325         }
2326
2327         sender = bus_label_unescape_n(p, q - p);
2328         external = bus_label_unescape(q + 1);
2329         if (!sender || !external) {
2330                 free(sender);
2331                 free(external);
2332                 return -ENOMEM;
2333         }
2334
2335         *ret_sender = sender;
2336         *ret_external = external;
2337         return 1;
2338 }
2339 #endif // 0
2340
2341 bool is_kdbus_wanted(void) {
2342         _cleanup_free_ char *value = NULL;
2343 #ifdef ENABLE_KDBUS
2344         const bool configured = true;
2345 #else
2346         const bool configured = false;
2347 #endif
2348
2349         int r;
2350
2351         if (get_proc_cmdline_key("kdbus", NULL) > 0)
2352                 return true;
2353
2354         r = get_proc_cmdline_key("kdbus=", &value);
2355         if (r <= 0)
2356                 return configured;
2357
2358         return parse_boolean(value) == 1;
2359 }
2360
2361 bool is_kdbus_available(void) {
2362         _cleanup_close_ int fd = -1;
2363         struct kdbus_cmd cmd = { .size = sizeof(cmd), .flags = KDBUS_FLAG_NEGOTIATE };
2364
2365         if (!is_kdbus_wanted())
2366                 return false;
2367
2368         fd = open("/sys/fs/kdbus/control", O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY);
2369         if (fd < 0)
2370                 return false;
2371
2372         return ioctl(fd, KDBUS_CMD_BUS_MAKE, &cmd) >= 0;
2373 }
2374
2375 #if 0 /// UNNEEDED by elogind
2376 int bus_property_get_rlimit(
2377                 sd_bus *bus,
2378                 const char *path,
2379                 const char *interface,
2380                 const char *property,
2381                 sd_bus_message *reply,
2382                 void *userdata,
2383                 sd_bus_error *error) {
2384
2385         struct rlimit *rl;
2386         uint64_t u;
2387         rlim_t x;
2388         const char *is_soft;
2389
2390         assert(bus);
2391         assert(reply);
2392         assert(userdata);
2393
2394         is_soft = endswith(property, "Soft");
2395         rl = *(struct rlimit**) userdata;
2396         if (rl)
2397                 x = is_soft ? rl->rlim_cur : rl->rlim_max;
2398         else {
2399                 struct rlimit buf = {};
2400                 int z;
2401                 const char *s;
2402
2403                 s = is_soft ? strndupa(property, is_soft - property) : property;
2404
2405                 z = rlimit_from_string(strstr(s, "Limit"));
2406                 assert(z >= 0);
2407
2408                 getrlimit(z, &buf);
2409                 x = is_soft ? buf.rlim_cur : buf.rlim_max;
2410         }
2411
2412         /* rlim_t might have different sizes, let's map
2413          * RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on
2414          * all archs */
2415         u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x;
2416
2417         return sd_bus_message_append(reply, "t", u);
2418 }
2419 #endif // 0