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