src/core/dbus-unit.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "sd-bus.h"
   4
   5 #include "alloc-util.h"
   6 #include "bpf-firewall.h"
   7 #include "bus-common-errors.h"
   8 #include "cgroup-util.h"
   9 #include "condition.h"
  10 #include "dbus-job.h"
  11 #include "dbus-unit.h"
  12 #include "dbus-util.h"
  13 #include "dbus.h"
  14 #include "fd-util.h"
  15 #include "locale-util.h"
  16 #include "log.h"
  17 #include "path-util.h"
  18 #include "process-util.h"
  19 #include "selinux-access.h"
  20 #include "signal-util.h"
  21 #include "special.h"
  22 #include "string-util.h"
  23 #include "strv.h"
  24 #include "user-util.h"
  25 #include "web-util.h"
  26
  27 static bool unit_can_start_refuse_manual(Unit *u) {
  28         return unit_can_start(u) && !u->refuse_manual_start;
  29 }
  30
  31 static bool unit_can_stop_refuse_manual(Unit *u) {
  32         return unit_can_stop(u) && !u->refuse_manual_stop;
  33 }
  34
  35 static bool unit_can_isolate_refuse_manual(Unit *u) {
  36         return unit_can_isolate(u) && !u->refuse_manual_start;
  37 }
  38
  39 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_collect_mode, collect_mode, CollectMode);
  40 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_load_state, unit_load_state, UnitLoadState);
  41 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_job_mode, job_mode, JobMode);
  42 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_emergency_action, emergency_action, EmergencyAction);
  43 static BUS_DEFINE_PROPERTY_GET(property_get_description, "s", Unit, unit_description);
  44 static BUS_DEFINE_PROPERTY_GET2(property_get_active_state, "s", Unit, unit_active_state, unit_active_state_to_string);
  45 static BUS_DEFINE_PROPERTY_GET(property_get_sub_state, "s", Unit, unit_sub_state_to_string);
  46 static BUS_DEFINE_PROPERTY_GET2(property_get_unit_file_state, "s", Unit, unit_get_unit_file_state, unit_file_state_to_string);
  47 static BUS_DEFINE_PROPERTY_GET(property_get_can_reload, "b", Unit, unit_can_reload);
  48 static BUS_DEFINE_PROPERTY_GET(property_get_can_start, "b", Unit, unit_can_start_refuse_manual);
  49 static BUS_DEFINE_PROPERTY_GET(property_get_can_stop, "b", Unit, unit_can_stop_refuse_manual);
  50 static BUS_DEFINE_PROPERTY_GET(property_get_can_isolate, "b", Unit, unit_can_isolate_refuse_manual);
  51 static BUS_DEFINE_PROPERTY_GET(property_get_need_daemon_reload, "b", Unit, unit_need_daemon_reload);
  52 static BUS_DEFINE_PROPERTY_GET_GLOBAL(property_get_empty_strv, "as", 0);
  53
  54 static int property_get_names(
  55                 sd_bus *bus,
  56                 const char *path,
  57                 const char *interface,
  58                 const char *property,
  59                 sd_bus_message *reply,
  60                 void *userdata,
  61                 sd_bus_error *error) {
  62
  63         Set **s = userdata;
  64         Iterator i;
  65         const char *t;
  66         int r;
  67
  68         assert(bus);
  69         assert(reply);
  70         assert(s);
  71
  72         r = sd_bus_message_open_container(reply, 'a', "s");
  73         if (r < 0)
  74                 return r;
  75
  76         SET_FOREACH(t, *s, i) {
  77                 r = sd_bus_message_append(reply, "s", t);
  78                 if (r < 0)
  79                         return r;
  80         }
  81
  82         return sd_bus_message_close_container(reply);
  83 }
  84
  85 static int property_get_following(
  86                 sd_bus *bus,
  87                 const char *path,
  88                 const char *interface,
  89                 const char *property,
  90                 sd_bus_message *reply,
  91                 void *userdata,
  92                 sd_bus_error *error) {
  93
  94         Unit *u = userdata, *f;
  95
  96         assert(bus);
  97         assert(reply);
  98         assert(u);
  99
 100         f = unit_following(u);
 101         return sd_bus_message_append(reply, "s", f ? f->id : NULL);
 102 }
 103
 104 static int property_get_dependencies(
 105                 sd_bus *bus,
 106                 const char *path,
 107                 const char *interface,
 108                 const char *property,
 109                 sd_bus_message *reply,
 110                 void *userdata,
 111                 sd_bus_error *error) {
 112
 113         Hashmap **h = userdata;
 114         Iterator j;
 115         Unit *u;
 116         void *v;
 117         int r;
 118
 119         assert(bus);
 120         assert(reply);
 121         assert(h);
 122
 123         r = sd_bus_message_open_container(reply, 'a', "s");
 124         if (r < 0)
 125                 return r;
 126
 127         HASHMAP_FOREACH_KEY(v, u, *h, j) {
 128                 r = sd_bus_message_append(reply, "s", u->id);
 129                 if (r < 0)
 130                         return r;
 131         }
 132
 133         return sd_bus_message_close_container(reply);
 134 }
 135
 136 static int property_get_requires_mounts_for(
 137                 sd_bus *bus,
 138                 const char *path,
 139                 const char *interface,
 140                 const char *property,
 141                 sd_bus_message *reply,
 142                 void *userdata,
 143                 sd_bus_error *error) {
 144
 145         Hashmap **h = userdata;
 146         const char *p;
 147         Iterator j;
 148         void *v;
 149         int r;
 150
 151         assert(bus);
 152         assert(reply);
 153         assert(h);
 154
 155         r = sd_bus_message_open_container(reply, 'a', "s");
 156         if (r < 0)
 157                 return r;
 158
 159         HASHMAP_FOREACH_KEY(v, p, *h, j) {
 160                 r = sd_bus_message_append(reply, "s", p);
 161                 if (r < 0)
 162                         return r;
 163         }
 164
 165         return sd_bus_message_close_container(reply);
 166 }
 167
 168 static int property_get_unit_file_preset(
 169                 sd_bus *bus,
 170                 const char *path,
 171                 const char *interface,
 172                 const char *property,
 173                 sd_bus_message *reply,
 174                 void *userdata,
 175                 sd_bus_error *error) {
 176
 177         Unit *u = userdata;
 178         int r;
 179
 180         assert(bus);
 181         assert(reply);
 182         assert(u);
 183
 184         r = unit_get_unit_file_preset(u);
 185
 186         return sd_bus_message_append(reply, "s",
 187                                      r < 0 ? NULL:
 188                                      r > 0 ? "enabled" : "disabled");
 189 }
 190
 191 static int property_get_job(
 192                 sd_bus *bus,
 193                 const char *path,
 194                 const char *interface,
 195                 const char *property,
 196                 sd_bus_message *reply,
 197                 void *userdata,
 198                 sd_bus_error *error) {
 199
 200         _cleanup_free_ char *p = NULL;
 201         Job **j = userdata;
 202
 203         assert(bus);
 204         assert(reply);
 205         assert(j);
 206
 207         if (!*j)
 208                 return sd_bus_message_append(reply, "(uo)", 0, "/");
 209
 210         p = job_dbus_path(*j);
 211         if (!p)
 212                 return -ENOMEM;
 213
 214         return sd_bus_message_append(reply, "(uo)", (*j)->id, p);
 215 }
 216
 217 static int property_get_conditions(
 218                 sd_bus *bus,
 219                 const char *path,
 220                 const char *interface,
 221                 const char *property,
 222                 sd_bus_message *reply,
 223                 void *userdata,
 224                 sd_bus_error *error) {
 225
 226         const char *(*to_string)(ConditionType type) = NULL;
 227         Condition **list = userdata, *c;
 228         int r;
 229
 230         assert(bus);
 231         assert(reply);
 232         assert(list);
 233
 234         to_string = streq(property, "Asserts") ? assert_type_to_string : condition_type_to_string;
 235
 236         r = sd_bus_message_open_container(reply, 'a', "(sbbsi)");
 237         if (r < 0)
 238                 return r;
 239
 240         LIST_FOREACH(conditions, c, *list) {
 241                 int tristate;
 242
 243                 tristate =
 244                         c->result == CONDITION_UNTESTED ? 0 :
 245                         c->result == CONDITION_SUCCEEDED ? 1 : -1;
 246
 247                 r = sd_bus_message_append(reply, "(sbbsi)",
 248                                           to_string(c->type),
 249                                           c->trigger, c->negate,
 250                                           c->parameter, tristate);
 251                 if (r < 0)
 252                         return r;
 253
 254         }
 255
 256         return sd_bus_message_close_container(reply);
 257 }
 258
 259 static int property_get_load_error(
 260                 sd_bus *bus,
 261                 const char *path,
 262                 const char *interface,
 263                 const char *property,
 264                 sd_bus_message *reply,
 265                 void *userdata,
 266                 sd_bus_error *error) {
 267
 268         _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
 269         Unit *u = userdata;
 270         int r;
 271
 272         assert(bus);
 273         assert(reply);
 274         assert(u);
 275
 276         r = bus_unit_validate_load_state(u, &e);
 277         if (r < 0)
 278                 return sd_bus_message_append(reply, "(ss)", e.name, e.message);
 279
 280         return sd_bus_message_append(reply, "(ss)", NULL, NULL);
 281 }
 282
 283 static int bus_verify_manage_units_async_full(
 284                 Unit *u,
 285                 const char *verb,
 286                 int capability,
 287                 const char *polkit_message,
 288                 bool interactive,
 289                 sd_bus_message *call,
 290                 sd_bus_error *error) {
 291
 292         const char *details[9] = {
 293                 "unit", u->id,
 294                 "verb", verb,
 295         };
 296
 297         if (polkit_message) {
 298                 details[4] = "polkit.message";
 299                 details[5] = polkit_message;
 300                 details[6] = "polkit.gettext_domain";
 301                 details[7] = GETTEXT_PACKAGE;
 302         }
 303
 304         return bus_verify_polkit_async(
 305                         call,
 306                         capability,
 307                         "org.freedesktop.systemd1.manage-units",
 308                         details,
 309                         interactive,
 310                         UID_INVALID,
 311                         &u->manager->polkit_registry,
 312                         error);
 313 }
 314
 315 int bus_unit_method_start_generic(
 316                 sd_bus_message *message,
 317                 Unit *u,
 318                 JobType job_type,
 319                 bool reload_if_possible,
 320                 sd_bus_error *error) {
 321
 322         const char *smode;
 323         JobMode mode;
 324         _cleanup_free_ char *verb = NULL;
 325         static const char *const polkit_message_for_job[_JOB_TYPE_MAX] = {
 326                 [JOB_START]       = N_("Authentication is required to start '$(unit)'."),
 327                 [JOB_STOP]        = N_("Authentication is required to stop '$(unit)'."),
 328                 [JOB_RELOAD]      = N_("Authentication is required to reload '$(unit)'."),
 329                 [JOB_RESTART]     = N_("Authentication is required to restart '$(unit)'."),
 330                 [JOB_TRY_RESTART] = N_("Authentication is required to restart '$(unit)'."),
 331         };
 332         int r;
 333
 334         assert(message);
 335         assert(u);
 336         assert(job_type >= 0 && job_type < _JOB_TYPE_MAX);
 337
 338         r = mac_selinux_unit_access_check(
 339                         u, message,
 340                         job_type_to_access_method(job_type),
 341                         error);
 342         if (r < 0)
 343                 return r;
 344
 345         r = sd_bus_message_read(message, "s", &smode);
 346         if (r < 0)
 347                 return r;
 348
 349         mode = job_mode_from_string(smode);
 350         if (mode < 0)
 351                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s invalid", smode);
 352
 353         if (reload_if_possible)
 354                 verb = strjoin("reload-or-", job_type_to_string(job_type));
 355         else
 356                 verb = strdup(job_type_to_string(job_type));
 357         if (!verb)
 358                 return -ENOMEM;
 359
 360         r = bus_verify_manage_units_async_full(
 361                         u,
 362                         verb,
 363                         CAP_SYS_ADMIN,
 364                         job_type < _JOB_TYPE_MAX ? polkit_message_for_job[job_type] : NULL,
 365                         true,
 366                         message,
 367                         error);
 368         if (r < 0)
 369                 return r;
 370         if (r == 0)
 371                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 372
 373         return bus_unit_queue_job(message, u, job_type, mode, reload_if_possible, error);
 374 }
 375
 376 static int method_start(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 377         return bus_unit_method_start_generic(message, userdata, JOB_START, false, error);
 378 }
 379
 380 static int method_stop(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 381         return bus_unit_method_start_generic(message, userdata, JOB_STOP, false, error);
 382 }
 383
 384 static int method_reload(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 385         return bus_unit_method_start_generic(message, userdata, JOB_RELOAD, false, error);
 386 }
 387
 388 static int method_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 389         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, false, error);
 390 }
 391
 392 static int method_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 393         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, false, error);
 394 }
 395
 396 static int method_reload_or_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 397         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, true, error);
 398 }
 399
 400 static int method_reload_or_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 401         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, true, error);
 402 }
 403
 404 int bus_unit_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 405         Unit *u = userdata;
 406         const char *swho;
 407         int32_t signo;
 408         KillWho who;
 409         int r;
 410
 411         assert(message);
 412         assert(u);
 413
 414         r = mac_selinux_unit_access_check(u, message, "stop", error);
 415         if (r < 0)
 416                 return r;
 417
 418         r = sd_bus_message_read(message, "si", &swho, &signo);
 419         if (r < 0)
 420                 return r;
 421
 422         if (isempty(swho))
 423                 who = KILL_ALL;
 424         else {
 425                 who = kill_who_from_string(swho);
 426                 if (who < 0)
 427                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid who argument %s", swho);
 428         }
 429
 430         if (!SIGNAL_VALID(signo))
 431                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Signal number out of range.");
 432
 433         r = bus_verify_manage_units_async_full(
 434                         u,
 435                         "kill",
 436                         CAP_KILL,
 437                         N_("Authentication is required to send a UNIX signal to the processes of '$(unit)'."),
 438                         true,
 439                         message,
 440                         error);
 441         if (r < 0)
 442                 return r;
 443         if (r == 0)
 444                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 445
 446         r = unit_kill(u, who, signo, error);
 447         if (r < 0)
 448                 return r;
 449
 450         return sd_bus_reply_method_return(message, NULL);
 451 }
 452
 453 int bus_unit_method_reset_failed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 454         Unit *u = userdata;
 455         int r;
 456
 457         assert(message);
 458         assert(u);
 459
 460         r = mac_selinux_unit_access_check(u, message, "reload", error);
 461         if (r < 0)
 462                 return r;
 463
 464         r = bus_verify_manage_units_async_full(
 465                         u,
 466                         "reset-failed",
 467                         CAP_SYS_ADMIN,
 468                         N_("Authentication is required to reset the \"failed\" state of '$(unit)'."),
 469                         true,
 470                         message,
 471                         error);
 472         if (r < 0)
 473                 return r;
 474         if (r == 0)
 475                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 476
 477         unit_reset_failed(u);
 478
 479         return sd_bus_reply_method_return(message, NULL);
 480 }
 481
 482 int bus_unit_method_set_properties(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 483         Unit *u = userdata;
 484         int runtime, r;
 485
 486         assert(message);
 487         assert(u);
 488
 489         r = mac_selinux_unit_access_check(u, message, "start", error);
 490         if (r < 0)
 491                 return r;
 492
 493         r = sd_bus_message_read(message, "b", &runtime);
 494         if (r < 0)
 495                 return r;
 496
 497         r = bus_verify_manage_units_async_full(
 498                         u,
 499                         "set-property",
 500                         CAP_SYS_ADMIN,
 501                         N_("Authentication is required to set properties on '$(unit)'."),
 502                         true,
 503                         message,
 504                         error);
 505         if (r < 0)
 506                 return r;
 507         if (r == 0)
 508                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 509
 510         r = bus_unit_set_properties(u, message, runtime ? UNIT_RUNTIME : UNIT_PERSISTENT, true, error);
 511         if (r < 0)
 512                 return r;
 513
 514         return sd_bus_reply_method_return(message, NULL);
 515 }
 516
 517 int bus_unit_method_ref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 518         Unit *u = userdata;
 519         int r;
 520
 521         assert(message);
 522         assert(u);
 523
 524         r = mac_selinux_unit_access_check(u, message, "start", error);
 525         if (r < 0)
 526                 return r;
 527
 528         r = bus_verify_manage_units_async_full(
 529                         u,
 530                         "ref",
 531                         CAP_SYS_ADMIN,
 532                         NULL,
 533                         false,
 534                         message,
 535                         error);
 536         if (r < 0)
 537                 return r;
 538         if (r == 0)
 539                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 540
 541         r = bus_unit_track_add_sender(u, message);
 542         if (r < 0)
 543                 return r;
 544
 545         return sd_bus_reply_method_return(message, NULL);
 546 }
 547
 548 int bus_unit_method_unref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 549         Unit *u = userdata;
 550         int r;
 551
 552         assert(message);
 553         assert(u);
 554
 555         r = bus_unit_track_remove_sender(u, message);
 556         if (r == -EUNATCH)
 557                 return sd_bus_error_setf(error, BUS_ERROR_NOT_REFERENCED, "Unit has not been referenced yet.");
 558         if (r < 0)
 559                 return r;
 560
 561         return sd_bus_reply_method_return(message, NULL);
 562 }
 563
 564 static int property_get_refs(
 565                 sd_bus *bus,
 566                 const char *path,
 567                 const char *interface,
 568                 const char *property,
 569                 sd_bus_message *reply,
 570                 void *userdata,
 571                 sd_bus_error *error) {
 572
 573         Unit *u = userdata;
 574         const char *i;
 575         int r;
 576
 577         assert(bus);
 578         assert(reply);
 579
 580         r = sd_bus_message_open_container(reply, 'a', "s");
 581         if (r < 0)
 582                 return r;
 583
 584         for (i = sd_bus_track_first(u->bus_track); i; i = sd_bus_track_next(u->bus_track)) {
 585                 int c, k;
 586
 587                 c = sd_bus_track_count_name(u->bus_track, i);
 588                 if (c < 0)
 589                         return c;
 590
 591                 /* Add the item multiple times if the ref count for each is above 1 */
 592                 for (k = 0; k < c; k++) {
 593                         r = sd_bus_message_append(reply, "s", i);
 594                         if (r < 0)
 595                                 return r;
 596                 }
 597         }
 598
 599         return sd_bus_message_close_container(reply);
 600 }
 601
 602 const sd_bus_vtable bus_unit_vtable[] = {
 603         SD_BUS_VTABLE_START(0),
 604
 605         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Unit, id), SD_BUS_VTABLE_PROPERTY_CONST),
 606         SD_BUS_PROPERTY("Names", "as", property_get_names, offsetof(Unit, names), SD_BUS_VTABLE_PROPERTY_CONST),
 607         SD_BUS_PROPERTY("Following", "s", property_get_following, 0, 0),
 608         SD_BUS_PROPERTY("Requires", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES]), SD_BUS_VTABLE_PROPERTY_CONST),
 609         SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), SD_BUS_VTABLE_PROPERTY_CONST),
 610         SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 611         SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 612         SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 613         SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 614         SD_BUS_PROPERTY("RequisiteOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 615         SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 616         SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 617         SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 618         SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 619         SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 620         SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), SD_BUS_VTABLE_PROPERTY_CONST),
 621         SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), SD_BUS_VTABLE_PROPERTY_CONST),
 622         SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), SD_BUS_VTABLE_PROPERTY_CONST),
 623         SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), SD_BUS_VTABLE_PROPERTY_CONST),
 624         SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 625         SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 626         SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), SD_BUS_VTABLE_PROPERTY_CONST),
 627         SD_BUS_PROPERTY("JoinsNamespaceOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_JOINS_NAMESPACE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 628         SD_BUS_PROPERTY("RequiresMountsFor", "as", property_get_requires_mounts_for, offsetof(Unit, requires_mounts_for), SD_BUS_VTABLE_PROPERTY_CONST),
 629         SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), SD_BUS_VTABLE_PROPERTY_CONST),
 630         SD_BUS_PROPERTY("Description", "s", property_get_description, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 631         SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), SD_BUS_VTABLE_PROPERTY_CONST),
 632         SD_BUS_PROPERTY("ActiveState", "s", property_get_active_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 633         SD_BUS_PROPERTY("SubState", "s", property_get_sub_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 634         SD_BUS_PROPERTY("FragmentPath", "s", NULL, offsetof(Unit, fragment_path), SD_BUS_VTABLE_PROPERTY_CONST),
 635         SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), SD_BUS_VTABLE_PROPERTY_CONST),
 636         SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), SD_BUS_VTABLE_PROPERTY_CONST),
 637         SD_BUS_PROPERTY("UnitFileState", "s", property_get_unit_file_state, 0, 0),
 638         SD_BUS_PROPERTY("UnitFilePreset", "s", property_get_unit_file_preset, 0, 0),
 639         BUS_PROPERTY_DUAL_TIMESTAMP("StateChangeTimestamp", offsetof(Unit, state_change_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 640         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveExitTimestamp", offsetof(Unit, inactive_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 641         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveEnterTimestamp", offsetof(Unit, active_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 642         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveExitTimestamp", offsetof(Unit, active_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 643         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveEnterTimestamp", offsetof(Unit, inactive_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 644         SD_BUS_PROPERTY("CanStart", "b", property_get_can_start, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 645         SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 646         SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 647         SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 648         SD_BUS_PROPERTY("Job", "(uo)", property_get_job, offsetof(Unit, job), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 649         SD_BUS_PROPERTY("StopWhenUnneeded", "b", bus_property_get_bool, offsetof(Unit, stop_when_unneeded), SD_BUS_VTABLE_PROPERTY_CONST),
 650         SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), SD_BUS_VTABLE_PROPERTY_CONST),
 651         SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), SD_BUS_VTABLE_PROPERTY_CONST),
 652         SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 653         SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), SD_BUS_VTABLE_PROPERTY_CONST),
 654         SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), SD_BUS_VTABLE_PROPERTY_CONST),
 655         SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 656         SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 657         SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
 658         SD_BUS_PROPERTY("JobRunningTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_running_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
 659         SD_BUS_PROPERTY("JobTimeoutAction", "s", property_get_emergency_action, offsetof(Unit, job_timeout_action), SD_BUS_VTABLE_PROPERTY_CONST),
 660         SD_BUS_PROPERTY("JobTimeoutRebootArgument", "s", NULL, offsetof(Unit, job_timeout_reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 661         SD_BUS_PROPERTY("ConditionResult", "b", bus_property_get_bool, offsetof(Unit, condition_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 662         SD_BUS_PROPERTY("AssertResult", "b", bus_property_get_bool, offsetof(Unit, assert_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 663         BUS_PROPERTY_DUAL_TIMESTAMP("ConditionTimestamp", offsetof(Unit, condition_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 664         BUS_PROPERTY_DUAL_TIMESTAMP("AssertTimestamp", offsetof(Unit, assert_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 665         SD_BUS_PROPERTY("Conditions", "a(sbbsi)", property_get_conditions, offsetof(Unit, conditions), 0),
 666         SD_BUS_PROPERTY("Asserts", "a(sbbsi)", property_get_conditions, offsetof(Unit, asserts), 0),
 667         SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 668         SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), SD_BUS_VTABLE_PROPERTY_CONST),
 669         SD_BUS_PROPERTY("Perpetual", "b", bus_property_get_bool, offsetof(Unit, perpetual), SD_BUS_VTABLE_PROPERTY_CONST),
 670         SD_BUS_PROPERTY("StartLimitIntervalUSec", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST),
 671         SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Unit, start_limit.burst), SD_BUS_VTABLE_PROPERTY_CONST),
 672         SD_BUS_PROPERTY("StartLimitAction", "s", property_get_emergency_action, offsetof(Unit, start_limit_action), SD_BUS_VTABLE_PROPERTY_CONST),
 673         SD_BUS_PROPERTY("FailureAction", "s", property_get_emergency_action, offsetof(Unit, failure_action), SD_BUS_VTABLE_PROPERTY_CONST),
 674         SD_BUS_PROPERTY("FailureActionExitStatus", "i", bus_property_get_int, offsetof(Unit, failure_action_exit_status), SD_BUS_VTABLE_PROPERTY_CONST),
 675         SD_BUS_PROPERTY("SuccessAction", "s", property_get_emergency_action, offsetof(Unit, success_action), SD_BUS_VTABLE_PROPERTY_CONST),
 676         SD_BUS_PROPERTY("SuccessActionExitStatus", "i", bus_property_get_int, offsetof(Unit, success_action_exit_status), SD_BUS_VTABLE_PROPERTY_CONST),
 677         SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Unit, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 678         SD_BUS_PROPERTY("InvocationID", "ay", bus_property_get_id128, offsetof(Unit, invocation_id), 0),
 679         SD_BUS_PROPERTY("CollectMode", "s", property_get_collect_mode, offsetof(Unit, collect_mode), 0),
 680         SD_BUS_PROPERTY("Refs", "as", property_get_refs, 0, 0),
 681
 682         SD_BUS_METHOD("Start", "s", "o", method_start, SD_BUS_VTABLE_UNPRIVILEGED),
 683         SD_BUS_METHOD("Stop", "s", "o", method_stop, SD_BUS_VTABLE_UNPRIVILEGED),
 684         SD_BUS_METHOD("Reload", "s", "o", method_reload, SD_BUS_VTABLE_UNPRIVILEGED),
 685         SD_BUS_METHOD("Restart", "s", "o", method_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 686         SD_BUS_METHOD("TryRestart", "s", "o", method_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 687         SD_BUS_METHOD("ReloadOrRestart", "s", "o", method_reload_or_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 688         SD_BUS_METHOD("ReloadOrTryRestart", "s", "o", method_reload_or_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 689         SD_BUS_METHOD("Kill", "si", NULL, bus_unit_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 690         SD_BUS_METHOD("ResetFailed", NULL, NULL, bus_unit_method_reset_failed, SD_BUS_VTABLE_UNPRIVILEGED),
 691         SD_BUS_METHOD("SetProperties", "ba(sv)", NULL, bus_unit_method_set_properties, SD_BUS_VTABLE_UNPRIVILEGED),
 692         SD_BUS_METHOD("Ref", NULL, NULL, bus_unit_method_ref, SD_BUS_VTABLE_UNPRIVILEGED),
 693         SD_BUS_METHOD("Unref", NULL, NULL, bus_unit_method_unref, SD_BUS_VTABLE_UNPRIVILEGED),
 694
 695         /* For dependency types we don't support anymore always return an empty array */
 696         SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
 697         SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
 698         SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
 699         SD_BUS_PROPERTY("RequisiteOfOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
 700         /* Obsolete alias names */
 701         SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
 702         SD_BUS_PROPERTY("StartLimitIntervalSec", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
 703         SD_BUS_VTABLE_END
 704 };
 705
 706 static int property_get_slice(
 707                 sd_bus *bus,
 708                 const char *path,
 709                 const char *interface,
 710                 const char *property,
 711                 sd_bus_message *reply,
 712                 void *userdata,
 713                 sd_bus_error *error) {
 714
 715         Unit *u = userdata;
 716
 717         assert(bus);
 718         assert(reply);
 719         assert(u);
 720
 721         return sd_bus_message_append(reply, "s", unit_slice_name(u));
 722 }
 723
 724 static int property_get_current_memory(
 725                 sd_bus *bus,
 726                 const char *path,
 727                 const char *interface,
 728                 const char *property,
 729                 sd_bus_message *reply,
 730                 void *userdata,
 731                 sd_bus_error *error) {
 732
 733         uint64_t sz = (uint64_t) -1;
 734         Unit *u = userdata;
 735         int r;
 736
 737         assert(bus);
 738         assert(reply);
 739         assert(u);
 740
 741         r = unit_get_memory_current(u, &sz);
 742         if (r < 0 && r != -ENODATA)
 743                 log_unit_warning_errno(u, r, "Failed to get memory.usage_in_bytes attribute: %m");
 744
 745         return sd_bus_message_append(reply, "t", sz);
 746 }
 747
 748 static int property_get_current_tasks(
 749                 sd_bus *bus,
 750                 const char *path,
 751                 const char *interface,
 752                 const char *property,
 753                 sd_bus_message *reply,
 754                 void *userdata,
 755                 sd_bus_error *error) {
 756
 757         uint64_t cn = (uint64_t) -1;
 758         Unit *u = userdata;
 759         int r;
 760
 761         assert(bus);
 762         assert(reply);
 763         assert(u);
 764
 765         r = unit_get_tasks_current(u, &cn);
 766         if (r < 0 && r != -ENODATA)
 767                 log_unit_warning_errno(u, r, "Failed to get pids.current attribute: %m");
 768
 769         return sd_bus_message_append(reply, "t", cn);
 770 }
 771
 772 static int property_get_cpu_usage(
 773                 sd_bus *bus,
 774                 const char *path,
 775                 const char *interface,
 776                 const char *property,
 777                 sd_bus_message *reply,
 778                 void *userdata,
 779                 sd_bus_error *error) {
 780
 781         nsec_t ns = (nsec_t) -1;
 782         Unit *u = userdata;
 783         int r;
 784
 785         assert(bus);
 786         assert(reply);
 787         assert(u);
 788
 789         r = unit_get_cpu_usage(u, &ns);
 790         if (r < 0 && r != -ENODATA)
 791                 log_unit_warning_errno(u, r, "Failed to get cpuacct.usage attribute: %m");
 792
 793         return sd_bus_message_append(reply, "t", ns);
 794 }
 795
 796 static int property_get_cgroup(
 797                 sd_bus *bus,
 798                 const char *path,
 799                 const char *interface,
 800                 const char *property,
 801                 sd_bus_message *reply,
 802                 void *userdata,
 803                 sd_bus_error *error) {
 804
 805         Unit *u = userdata;
 806         const char *t = NULL;
 807
 808         assert(bus);
 809         assert(reply);
 810         assert(u);
 811
 812         /* Three cases: a) u->cgroup_path is NULL, in which case the
 813          * unit has no control group, which we report as the empty
 814          * string. b) u->cgroup_path is the empty string, which
 815          * indicates the root cgroup, which we report as "/". c) all
 816          * other cases we report as-is. */
 817
 818         if (u->cgroup_path)
 819                 t = empty_to_root(u->cgroup_path);
 820
 821         return sd_bus_message_append(reply, "s", t);
 822 }
 823
 824 static int append_process(sd_bus_message *reply, const char *p, pid_t pid, Set *pids) {
 825         _cleanup_free_ char *buf = NULL, *cmdline = NULL;
 826         int r;
 827
 828         assert(reply);
 829         assert(pid > 0);
 830
 831         r = set_put(pids, PID_TO_PTR(pid));
 832         if (IN_SET(r, 0, -EEXIST))
 833                 return 0;
 834         if (r < 0)
 835                 return r;
 836
 837         if (!p) {
 838                 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &buf);
 839                 if (r == -ESRCH)
 840                         return 0;
 841                 if (r < 0)
 842                         return r;
 843
 844                 p = buf;
 845         }
 846
 847         (void) get_process_cmdline(pid, 0, true, &cmdline);
 848
 849         return sd_bus_message_append(reply,
 850                                      "(sus)",
 851                                      p,
 852                                      (uint32_t) pid,
 853                                      cmdline);
 854 }
 855
 856 static int append_cgroup(sd_bus_message *reply, const char *p, Set *pids) {
 857         _cleanup_closedir_ DIR *d = NULL;
 858         _cleanup_fclose_ FILE *f = NULL;
 859         int r;
 860
 861         assert(reply);
 862         assert(p);
 863
 864         r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, p, &f);
 865         if (r == -ENOENT)
 866                 return 0;
 867         if (r < 0)
 868                 return r;
 869
 870         for (;;) {
 871                 pid_t pid;
 872
 873                 r = cg_read_pid(f, &pid);
 874                 if (r < 0)
 875                         return r;
 876                 if (r == 0)
 877                         break;
 878
 879                 if (is_kernel_thread(pid) > 0)
 880                         continue;
 881
 882                 r = append_process(reply, p, pid, pids);
 883                 if (r < 0)
 884                         return r;
 885         }
 886
 887         r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, p, &d);
 888         if (r == -ENOENT)
 889                 return 0;
 890         if (r < 0)
 891                 return r;
 892
 893         for (;;) {
 894                 _cleanup_free_ char *g = NULL, *j = NULL;
 895
 896                 r = cg_read_subgroup(d, &g);
 897                 if (r < 0)
 898                         return r;
 899                 if (r == 0)
 900                         break;
 901
 902                 j = strjoin(p, "/", g);
 903                 if (!j)
 904                         return -ENOMEM;
 905
 906                 r = append_cgroup(reply, j, pids);
 907                 if (r < 0)
 908                         return r;
 909         }
 910
 911         return 0;
 912 }
 913
 914 int bus_unit_method_get_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 915         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 916         _cleanup_set_free_ Set *pids = NULL;
 917         Unit *u = userdata;
 918         pid_t pid;
 919         int r;
 920
 921         assert(message);
 922
 923         r = mac_selinux_unit_access_check(u, message, "status", error);
 924         if (r < 0)
 925                 return r;
 926
 927         pids = set_new(NULL);
 928         if (!pids)
 929                 return -ENOMEM;
 930
 931         r = sd_bus_message_new_method_return(message, &reply);
 932         if (r < 0)
 933                 return r;
 934
 935         r = sd_bus_message_open_container(reply, 'a', "(sus)");
 936         if (r < 0)
 937                 return r;
 938
 939         if (u->cgroup_path) {
 940                 r = append_cgroup(reply, u->cgroup_path, pids);
 941                 if (r < 0)
 942                         return r;
 943         }
 944
 945         /* The main and control pids might live outside of the cgroup, hence fetch them separately */
 946         pid = unit_main_pid(u);
 947         if (pid > 0) {
 948                 r = append_process(reply, NULL, pid, pids);
 949                 if (r < 0)
 950                         return r;
 951         }
 952
 953         pid = unit_control_pid(u);
 954         if (pid > 0) {
 955                 r = append_process(reply, NULL, pid, pids);
 956                 if (r < 0)
 957                         return r;
 958         }
 959
 960         r = sd_bus_message_close_container(reply);
 961         if (r < 0)
 962                 return r;
 963
 964         return sd_bus_send(NULL, reply, NULL);
 965 }
 966
 967 static int property_get_ip_counter(
 968                 sd_bus *bus,
 969                 const char *path,
 970                 const char *interface,
 971                 const char *property,
 972                 sd_bus_message *reply,
 973                 void *userdata,
 974                 sd_bus_error *error) {
 975
 976         CGroupIPAccountingMetric metric;
 977         uint64_t value = (uint64_t) -1;
 978         Unit *u = userdata;
 979
 980         assert(bus);
 981         assert(reply);
 982         assert(property);
 983         assert(u);
 984
 985         if (streq(property, "IPIngressBytes"))
 986                 metric = CGROUP_IP_INGRESS_BYTES;
 987         else if (streq(property, "IPIngressPackets"))
 988                 metric = CGROUP_IP_INGRESS_PACKETS;
 989         else if (streq(property, "IPEgressBytes"))
 990                 metric = CGROUP_IP_EGRESS_BYTES;
 991         else {
 992                 assert(streq(property, "IPEgressPackets"));
 993                 metric = CGROUP_IP_EGRESS_PACKETS;
 994         }
 995
 996         (void) unit_get_ip_accounting(u, metric, &value);
 997         return sd_bus_message_append(reply, "t", value);
 998 }
 999
1000 int bus_unit_method_attach_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1001
1002         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
1003         _cleanup_set_free_ Set *pids = NULL;
1004         Unit *u = userdata;
1005         const char *path;
1006         int r;
1007
1008         assert(message);
1009
1010         /* This migrates the processes with the specified PIDs into the cgroup of this unit, optionally below a
1011          * specified cgroup path. Obviously this only works for units that actually maintain a cgroup
1012          * representation. If a process is already in the cgroup no operation is executed – in this case the specified
1013          * subcgroup path has no effect! */
1014
1015         r = mac_selinux_unit_access_check(u, message, "start", error);
1016         if (r < 0)
1017                 return r;
1018
1019         r = sd_bus_message_read(message, "s", &path);
1020         if (r < 0)
1021                 return r;
1022
1023         path = empty_to_null(path);
1024         if (path) {
1025                 if (!path_is_absolute(path))
1026                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Control group path is not absolute: %s", path);
1027
1028                 if (!path_is_normalized(path))
1029                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Control group path is not normalized: %s", path);
1030         }
1031
1032         if (!unit_cgroup_delegate(u))
1033                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Process migration not available on non-delegated units.");
1034
1035         if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)))
1036                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit is not active, refusing.");
1037
1038         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID, &creds);
1039         if (r < 0)
1040                 return r;
1041
1042         r = sd_bus_message_enter_container(message, 'a', "u");
1043         if (r < 0)
1044                 return r;
1045         for (;;) {
1046                 uid_t process_uid, sender_uid;
1047                 uint32_t upid;
1048                 pid_t pid;
1049
1050                 r = sd_bus_message_read(message, "u", &upid);
1051                 if (r < 0)
1052                         return r;
1053                 if (r == 0)
1054                         break;
1055
1056                 if (upid == 0) {
1057                         r = sd_bus_creds_get_pid(creds, &pid);
1058                         if (r < 0)
1059                                 return r;
1060                 } else
1061                         pid = (uid_t) upid;
1062
1063                 /* Filter out duplicates */
1064                 if (set_contains(pids, PID_TO_PTR(pid)))
1065                         continue;
1066
1067                 /* Check if this process is suitable for attaching to this unit */
1068                 r = unit_pid_attachable(u, pid, error);
1069                 if (r < 0)
1070                         return r;
1071
1072                 /* Let's query the sender's UID, so that we can make our security decisions */
1073                 r = sd_bus_creds_get_euid(creds, &sender_uid);
1074                 if (r < 0)
1075                         return r;
1076
1077                 /* Let's validate security: if the sender is root, then all is OK. If the sender is any other unit,
1078                  * then the process' UID and the target unit's UID have to match the sender's UID */
1079                 if (sender_uid != 0 && sender_uid != getuid()) {
1080                         r = get_process_uid(pid, &process_uid);
1081                         if (r < 0)
1082                                 return sd_bus_error_set_errnof(error, r, "Failed to retrieve process UID: %m");
1083
1084                         if (process_uid != sender_uid)
1085                                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Process " PID_FMT " not owned by client's UID. Refusing.", pid);
1086                         if (process_uid != u->ref_uid)
1087                                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Process " PID_FMT " not owned by target unit's UID. Refusing.", pid);
1088                 }
1089
1090                 if (!pids) {
1091                         pids = set_new(NULL);
1092                         if (!pids)
1093                                 return -ENOMEM;
1094                 }
1095
1096                 r = set_put(pids, PID_TO_PTR(pid));
1097                 if (r < 0)
1098                         return r;
1099         }
1100
1101         r = sd_bus_message_exit_container(message);
1102         if (r < 0)
1103                 return r;
1104
1105         r = unit_attach_pids_to_cgroup(u, pids, path);
1106         if (r < 0)
1107                 return sd_bus_error_set_errnof(error, r, "Failed to attach processes to control group: %m");
1108
1109         return sd_bus_reply_method_return(message, NULL);
1110 }
1111
1112 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
1113         SD_BUS_VTABLE_START(0),
1114         SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
1115         SD_BUS_PROPERTY("ControlGroup", "s", property_get_cgroup, 0, 0),
1116         SD_BUS_PROPERTY("MemoryCurrent", "t", property_get_current_memory, 0, 0),
1117         SD_BUS_PROPERTY("CPUUsageNSec", "t", property_get_cpu_usage, 0, 0),
1118         SD_BUS_PROPERTY("TasksCurrent", "t", property_get_current_tasks, 0, 0),
1119         SD_BUS_PROPERTY("IPIngressBytes", "t", property_get_ip_counter, 0, 0),
1120         SD_BUS_PROPERTY("IPIngressPackets", "t", property_get_ip_counter, 0, 0),
1121         SD_BUS_PROPERTY("IPEgressBytes", "t", property_get_ip_counter, 0, 0),
1122         SD_BUS_PROPERTY("IPEgressPackets", "t", property_get_ip_counter, 0, 0),
1123         SD_BUS_METHOD("GetProcesses", NULL, "a(sus)", bus_unit_method_get_processes, SD_BUS_VTABLE_UNPRIVILEGED),
1124         SD_BUS_METHOD("AttachProcesses", "sau", NULL, bus_unit_method_attach_processes, SD_BUS_VTABLE_UNPRIVILEGED),
1125         SD_BUS_VTABLE_END
1126 };
1127
1128 static int send_new_signal(sd_bus *bus, void *userdata) {
1129         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1130         _cleanup_free_ char *p = NULL;
1131         Unit *u = userdata;
1132         int r;
1133
1134         assert(bus);
1135         assert(u);
1136
1137         p = unit_dbus_path(u);
1138         if (!p)
1139                 return -ENOMEM;
1140
1141         r = sd_bus_message_new_signal(
1142                         bus,
1143                         &m,
1144                         "/org/freedesktop/systemd1",
1145                         "org.freedesktop.systemd1.Manager",
1146                         "UnitNew");
1147         if (r < 0)
1148                 return r;
1149
1150         r = sd_bus_message_append(m, "so", u->id, p);
1151         if (r < 0)
1152                 return r;
1153
1154         return sd_bus_send(bus, m, NULL);
1155 }
1156
1157 static int send_changed_signal(sd_bus *bus, void *userdata) {
1158         _cleanup_free_ char *p = NULL;
1159         Unit *u = userdata;
1160         int r;
1161
1162         assert(bus);
1163         assert(u);
1164
1165         p = unit_dbus_path(u);
1166         if (!p)
1167                 return -ENOMEM;
1168
1169         /* Send a properties changed signal. First for the specific
1170          * type, then for the generic unit. The clients may rely on
1171          * this order to get atomic behavior if needed. */
1172
1173         r = sd_bus_emit_properties_changed_strv(
1174                         bus, p,
1175                         unit_dbus_interface_from_type(u->type),
1176                         NULL);
1177         if (r < 0)
1178                 return r;
1179
1180         return sd_bus_emit_properties_changed_strv(
1181                         bus, p,
1182                         "org.freedesktop.systemd1.Unit",
1183                         NULL);
1184 }
1185
1186 void bus_unit_send_change_signal(Unit *u) {
1187         int r;
1188         assert(u);
1189
1190         if (u->in_dbus_queue) {
1191                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
1192                 u->in_dbus_queue = false;
1193         }
1194
1195         if (!u->id)
1196                 return;
1197
1198         r = bus_foreach_bus(u->manager, u->bus_track, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
1199         if (r < 0)
1200                 log_unit_debug_errno(u, r, "Failed to send unit change signal for %s: %m", u->id);
1201
1202         u->sent_dbus_new_signal = true;
1203 }
1204
1205 static int send_removed_signal(sd_bus *bus, void *userdata) {
1206         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1207         _cleanup_free_ char *p = NULL;
1208         Unit *u = userdata;
1209         int r;
1210
1211         assert(bus);
1212         assert(u);
1213
1214         p = unit_dbus_path(u);
1215         if (!p)
1216                 return -ENOMEM;
1217
1218         r = sd_bus_message_new_signal(
1219                         bus,
1220                         &m,
1221                         "/org/freedesktop/systemd1",
1222                         "org.freedesktop.systemd1.Manager",
1223                         "UnitRemoved");
1224         if (r < 0)
1225                 return r;
1226
1227         r = sd_bus_message_append(m, "so", u->id, p);
1228         if (r < 0)
1229                 return r;
1230
1231         return sd_bus_send(bus, m, NULL);
1232 }
1233
1234 void bus_unit_send_removed_signal(Unit *u) {
1235         int r;
1236         assert(u);
1237
1238         if (!u->sent_dbus_new_signal || u->in_dbus_queue)
1239                 bus_unit_send_change_signal(u);
1240
1241         if (!u->id)
1242                 return;
1243
1244         r = bus_foreach_bus(u->manager, u->bus_track, send_removed_signal, u);
1245         if (r < 0)
1246                 log_unit_debug_errno(u, r, "Failed to send unit remove signal for %s: %m", u->id);
1247 }
1248
1249 int bus_unit_queue_job(
1250                 sd_bus_message *message,
1251                 Unit *u,
1252                 JobType type,
1253                 JobMode mode,
1254                 bool reload_if_possible,
1255                 sd_bus_error *error) {
1256
1257         _cleanup_free_ char *path = NULL;
1258         Job *j;
1259         int r;
1260
1261         assert(message);
1262         assert(u);
1263         assert(type >= 0 && type < _JOB_TYPE_MAX);
1264         assert(mode >= 0 && mode < _JOB_MODE_MAX);
1265
1266         r = mac_selinux_unit_access_check(
1267                         u, message,
1268                         job_type_to_access_method(type),
1269                         error);
1270         if (r < 0)
1271                 return r;
1272
1273         if (reload_if_possible && unit_can_reload(u)) {
1274                 if (type == JOB_RESTART)
1275                         type = JOB_RELOAD_OR_START;
1276                 else if (type == JOB_TRY_RESTART)
1277                         type = JOB_TRY_RELOAD;
1278         }
1279
1280         if (type == JOB_STOP &&
1281             IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_ERROR, UNIT_BAD_SETTING) &&
1282             unit_active_state(u) == UNIT_INACTIVE)
1283                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
1284
1285         if ((type == JOB_START && u->refuse_manual_start) ||
1286             (type == JOB_STOP && u->refuse_manual_stop) ||
1287             (IN_SET(type, JOB_RESTART, JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)) ||
1288             (type == JOB_RELOAD_OR_START && job_type_collapse(type, u) == JOB_START && u->refuse_manual_start))
1289                 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only (it is configured to refuse manual start/stop).", u->id);
1290
1291         r = manager_add_job(u->manager, type, u, mode, error, &j);
1292         if (r < 0)
1293                 return r;
1294
1295         r = bus_job_track_sender(j, message);
1296         if (r < 0)
1297                 return r;
1298
1299         path = job_dbus_path(j);
1300         if (!path)
1301                 return -ENOMEM;
1302
1303         return sd_bus_reply_method_return(message, "o", path);
1304 }
1305
1306 static int bus_unit_set_live_property(
1307                 Unit *u,
1308                 const char *name,
1309                 sd_bus_message *message,
1310                 UnitWriteFlags flags,
1311                 sd_bus_error *error) {
1312
1313         int r;
1314
1315         assert(u);
1316         assert(name);
1317         assert(message);
1318
1319         /* Handles setting properties both "live" (i.e. at any time during runtime), and during creation (for transient
1320          * units that are being created). */
1321
1322         if (streq(name, "Description")) {
1323                 const char *d;
1324
1325                 r = sd_bus_message_read(message, "s", &d);
1326                 if (r < 0)
1327                         return r;
1328
1329                 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1330                         r = unit_set_description(u, d);
1331                         if (r < 0)
1332                                 return r;
1333
1334                         unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "Description=%s", d);
1335                 }
1336
1337                 return 1;
1338         }
1339
1340         return 0;
1341 }
1342
1343 static int bus_set_transient_emergency_action(
1344                 Unit *u,
1345                 const char *name,
1346                 EmergencyAction *p,
1347                 sd_bus_message *message,
1348                 UnitWriteFlags flags,
1349                 sd_bus_error *error) {
1350
1351         const char *s;
1352         EmergencyAction v;
1353         int r;
1354         bool system;
1355
1356         assert(p);
1357
1358         r = sd_bus_message_read(message, "s", &s);
1359         if (r < 0)
1360                 return r;
1361
1362         system = MANAGER_IS_SYSTEM(u->manager);
1363         r = parse_emergency_action(s, system, &v);
1364         if (v < 0)
1365                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
1366                                          v == -EOPNOTSUPP ? "EmergencyAction setting invalid for manager type: %s"
1367                                                           : "Invalid %s setting: %s",
1368                                          name, s);
1369
1370         if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1371                 *p = v;
1372                 unit_write_settingf(u, flags, name,
1373                                     "%s=%s", name, s);
1374         }
1375
1376         return 1;
1377 }
1378
1379 static int bus_set_transient_exit_status(
1380                 Unit *u,
1381                 const char *name,
1382                 int *p,
1383                 sd_bus_message *message,
1384                 UnitWriteFlags flags,
1385                 sd_bus_error *error) {
1386
1387         int32_t k;
1388         int r;
1389
1390         assert(p);
1391
1392         r = sd_bus_message_read(message, "i", &k);
1393         if (r < 0)
1394                 return r;
1395
1396         if (k > 255)
1397                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Exit status must be in range 0…255 or negative.");
1398
1399         if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1400                 *p = k < 0 ? -1 : k;
1401
1402                 if (k < 0)
1403                         unit_write_settingf(u, flags, name, "%s=", name);
1404                 else
1405                         unit_write_settingf(u, flags, name, "%s=%i", name, k);
1406         }
1407
1408         return 1;
1409 }
1410
1411 static BUS_DEFINE_SET_TRANSIENT_PARSE(collect_mode, CollectMode, collect_mode_from_string);
1412 static BUS_DEFINE_SET_TRANSIENT_PARSE(job_mode, JobMode, job_mode_from_string);
1413
1414 static int bus_set_transient_conditions(
1415                 Unit *u,
1416                 const char *name,
1417                 Condition **list,
1418                 bool is_condition,
1419                 sd_bus_message *message,
1420                 UnitWriteFlags flags,
1421                 sd_bus_error *error) {
1422
1423         const char *type_name, *param;
1424         int trigger, negate, r;
1425         bool empty = true;
1426
1427         assert(list);
1428
1429         r = sd_bus_message_enter_container(message, 'a', "(sbbs)");
1430         if (r < 0)
1431                 return r;
1432
1433         while ((r = sd_bus_message_read(message, "(sbbs)", &type_name, &trigger, &negate, &param)) > 0) {
1434                 ConditionType t;
1435
1436                 t = is_condition ? condition_type_from_string(type_name) : assert_type_from_string(type_name);
1437                 if (t < 0)
1438                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid condition type: %s", type_name);
1439
1440                 if (t != CONDITION_NULL) {
1441                         if (isempty(param))
1442                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Condition parameter in %s is empty", type_name);
1443
1444                         if (condition_takes_path(t) && !path_is_absolute(param))
1445                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path in condition %s is not absolute: %s", type_name, param);
1446                 } else
1447                         param = NULL;
1448
1449                 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1450                         Condition *c;
1451
1452                         c = condition_new(t, param, trigger, negate);
1453                         if (!c)
1454                                 return -ENOMEM;
1455
1456                         LIST_PREPEND(conditions, *list, c);
1457
1458                         if (t != CONDITION_NULL)
1459                                 unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name,
1460                                                     "%s=%s%s%s", type_name,
1461                                                     trigger ? "|" : "", negate ? "!" : "", param);
1462                         else
1463                                 unit_write_settingf(u, flags, name,
1464                                                     "%s=%s%s", type_name,
1465                                                     trigger ? "|" : "", yes_no(!negate));
1466                 }
1467
1468                 empty = false;
1469         }
1470         if (r < 0)
1471                 return r;
1472
1473         r = sd_bus_message_exit_container(message);
1474         if (r < 0)
1475                 return r;
1476
1477         if (!UNIT_WRITE_FLAGS_NOOP(flags) && empty) {
1478                 *list = condition_free_list(*list);
1479                 unit_write_settingf(u, flags, name, "%sNull=", is_condition ? "Condition" : "Assert");
1480         }
1481
1482         return 1;
1483 }
1484
1485 static int bus_unit_set_transient_property(
1486                 Unit *u,
1487                 const char *name,
1488                 sd_bus_message *message,
1489                 UnitWriteFlags flags,
1490                 sd_bus_error *error) {
1491
1492         UnitDependency d = _UNIT_DEPENDENCY_INVALID;
1493         int r;
1494
1495         assert(u);
1496         assert(name);
1497         assert(message);
1498
1499         /* Handles settings when transient units are created. This settings cannot be altered anymore after the unit
1500          * has been created. */
1501
1502         if (streq(name, "SourcePath"))
1503                 return bus_set_transient_path(u, name, &u->source_path, message, flags, error);
1504
1505         if (streq(name, "StopWhenUnneeded"))
1506                 return bus_set_transient_bool(u, name, &u->stop_when_unneeded, message, flags, error);
1507
1508         if (streq(name, "RefuseManualStart"))
1509                 return bus_set_transient_bool(u, name, &u->refuse_manual_start, message, flags, error);
1510
1511         if (streq(name, "RefuseManualStop"))
1512                 return bus_set_transient_bool(u, name, &u->refuse_manual_stop, message, flags, error);
1513
1514         if (streq(name, "AllowIsolate"))
1515                 return bus_set_transient_bool(u, name, &u->allow_isolate, message, flags, error);
1516
1517         if (streq(name, "DefaultDependencies"))
1518                 return bus_set_transient_bool(u, name, &u->default_dependencies, message, flags, error);
1519
1520         if (streq(name, "OnFailureJobMode"))
1521                 return bus_set_transient_job_mode(u, name, &u->on_failure_job_mode, message, flags, error);
1522
1523         if (streq(name, "IgnoreOnIsolate"))
1524                 return bus_set_transient_bool(u, name, &u->ignore_on_isolate, message, flags, error);
1525
1526         if (streq(name, "JobTimeoutUSec")) {
1527                 r = bus_set_transient_usec_fix_0(u, name, &u->job_timeout, message, flags, error);
1528                 if (r >= 0 && !UNIT_WRITE_FLAGS_NOOP(flags) && !u->job_running_timeout_set)
1529                         u->job_running_timeout = u->job_timeout;
1530         }
1531
1532         if (streq(name, "JobRunningTimeoutUSec")) {
1533                 r = bus_set_transient_usec_fix_0(u, name, &u->job_running_timeout, message, flags, error);
1534                 if (r >= 0 && !UNIT_WRITE_FLAGS_NOOP(flags))
1535                         u->job_running_timeout_set = true;
1536
1537                 return r;
1538         }
1539
1540         if (streq(name, "JobTimeoutAction"))
1541                 return bus_set_transient_emergency_action(u, name, &u->job_timeout_action, message, flags, error);
1542
1543         if (streq(name, "JobTimeoutRebootArgument"))
1544                 return bus_set_transient_string(u, name, &u->job_timeout_reboot_arg, message, flags, error);
1545
1546         if (streq(name, "StartLimitIntervalUSec"))
1547                 return bus_set_transient_usec(u, name, &u->start_limit.interval, message, flags, error);
1548
1549         if (streq(name, "StartLimitBurst"))
1550                 return bus_set_transient_unsigned(u, name, &u->start_limit.burst, message, flags, error);
1551
1552         if (streq(name, "StartLimitAction"))
1553                 return bus_set_transient_emergency_action(u, name, &u->start_limit_action, message, flags, error);
1554
1555         if (streq(name, "FailureAction"))
1556                 return bus_set_transient_emergency_action(u, name, &u->failure_action, message, flags, error);
1557
1558         if (streq(name, "SuccessAction"))
1559                 return bus_set_transient_emergency_action(u, name, &u->success_action, message, flags, error);
1560
1561         if (streq(name, "FailureActionExitStatus"))
1562                 return bus_set_transient_exit_status(u, name, &u->failure_action_exit_status, message, flags, error);
1563
1564         if (streq(name, "SuccessActionExitStatus"))
1565                 return bus_set_transient_exit_status(u, name, &u->success_action_exit_status, message, flags, error);
1566
1567         if (streq(name, "RebootArgument"))
1568                 return bus_set_transient_string(u, name, &u->reboot_arg, message, flags, error);
1569
1570         if (streq(name, "CollectMode"))
1571                 return bus_set_transient_collect_mode(u, name, &u->collect_mode, message, flags, error);
1572
1573         if (streq(name, "Conditions"))
1574                 return bus_set_transient_conditions(u, name, &u->conditions, true, message, flags, error);
1575
1576         if (streq(name, "Asserts"))
1577                 return bus_set_transient_conditions(u, name, &u->asserts, false, message, flags, error);
1578
1579         if (streq(name, "Documentation")) {
1580                 _cleanup_strv_free_ char **l = NULL;
1581                 char **p;
1582
1583                 r = sd_bus_message_read_strv(message, &l);
1584                 if (r < 0)
1585                         return r;
1586
1587                 STRV_FOREACH(p, l) {
1588                         if (!documentation_url_is_valid(*p))
1589                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid URL in %s: %s", name, *p);
1590                 }
1591
1592                 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1593                         if (strv_isempty(l)) {
1594                                 u->documentation = strv_free(u->documentation);
1595                                 unit_write_settingf(u, flags, name, "%s=", name);
1596                         } else {
1597                                 strv_extend_strv(&u->documentation, l, false);
1598
1599                                 STRV_FOREACH(p, l)
1600                                         unit_write_settingf(u, flags, name, "%s=%s", name, *p);
1601                         }
1602                 }
1603
1604                 return 1;
1605
1606         } else if (streq(name, "Slice")) {
1607                 Unit *slice;
1608                 const char *s;
1609
1610                 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1611                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "The slice property is only available for units with control groups.");
1612                 if (u->type == UNIT_SLICE)
1613                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Slice may not be set for slice units.");
1614                 if (unit_has_name(u, SPECIAL_INIT_SCOPE))
1615                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot set slice for init.scope");
1616
1617                 r = sd_bus_message_read(message, "s", &s);
1618                 if (r < 0)
1619                         return r;
1620
1621                 if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
1622                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name '%s'", s);
1623
1624                 /* Note that we do not dispatch the load queue here yet, as we don't want our own transient unit to be
1625                  * loaded while we are still setting it up. Or in other words, we use manager_load_unit_prepare()
1626                  * instead of manager_load_unit() on purpose, here. */
1627                 r = manager_load_unit_prepare(u->manager, s, NULL, error, &slice);
1628                 if (r < 0)
1629                         return r;
1630
1631                 if (slice->type != UNIT_SLICE)
1632                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit name '%s' is not a slice", s);
1633
1634                 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1635                         r = unit_set_slice(u, slice);
1636                         if (r < 0)
1637                                 return r;
1638
1639                         unit_write_settingf(u, flags|UNIT_PRIVATE, name, "Slice=%s", s);
1640                 }
1641
1642                 return 1;
1643
1644         } else if (streq(name, "RequiresMountsFor")) {
1645                 _cleanup_strv_free_ char **l = NULL;
1646                 char **p;
1647
1648                 r = sd_bus_message_read_strv(message, &l);
1649                 if (r < 0)
1650                         return r;
1651
1652                 STRV_FOREACH(p, l) {
1653                         if (!path_is_absolute(*p))
1654                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path specified in %s is not absolute: %s", name, *p);
1655
1656                         if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1657                                 r = unit_require_mounts_for(u, *p, UNIT_DEPENDENCY_FILE);
1658                                 if (r < 0)
1659                                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Failed to add required mount \"%s\": %m", *p);
1660
1661                                 unit_write_settingf(u, flags, name, "%s=%s", name, *p);
1662                         }
1663                 }
1664
1665                 return 1;
1666         }
1667
1668         if (streq(name, "RequiresOverridable"))
1669                 d = UNIT_REQUIRES; /* redirect for obsolete unit dependency type */
1670         else if (streq(name, "RequisiteOverridable"))
1671                 d = UNIT_REQUISITE; /* same here */
1672         else
1673                 d = unit_dependency_from_string(name);
1674
1675         if (d >= 0) {
1676                 const char *other;
1677
1678                 r = sd_bus_message_enter_container(message, 'a', "s");
1679                 if (r < 0)
1680                         return r;
1681
1682                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
1683                         if (!unit_name_is_valid(other, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
1684                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
1685
1686                         if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1687                                 _cleanup_free_ char *label = NULL;
1688
1689                                 r = unit_add_dependency_by_name(u, d, other, true, UNIT_DEPENDENCY_FILE);
1690                                 if (r < 0)
1691                                         return r;
1692
1693                                 label = strjoin(name, "-", other);
1694                                 if (!label)
1695                                         return -ENOMEM;
1696
1697                                 unit_write_settingf(u, flags, label, "%s=%s", unit_dependency_to_string(d), other);
1698                         }
1699
1700                 }
1701                 if (r < 0)
1702                         return r;
1703
1704                 r = sd_bus_message_exit_container(message);
1705                 if (r < 0)
1706                         return r;
1707
1708                 return 1;
1709
1710         } else if (streq(name, "AddRef")) {
1711
1712                 int b;
1713
1714                 /* Why is this called "AddRef" rather than just "Ref", or "Reference"? There's already a "Ref()" method
1715                  * on the Unit interface, and it's probably not a good idea to expose a property and a method on the
1716                  * same interface (well, strictly speaking AddRef isn't exposed as full property, we just read it for
1717                  * transient units, but still). And "References" and "ReferencedBy" is already used as unit reference
1718                  * dependency type, hence let's not confuse things with that.
1719                  *
1720                  * Note that we don't acually add the reference to the bus track. We do that only after the setup of
1721                  * the transient unit is complete, so that setting this property multiple times in the same transient
1722                  * unit creation call doesn't count as individual references. */
1723
1724                 r = sd_bus_message_read(message, "b", &b);
1725                 if (r < 0)
1726                         return r;
1727
1728                 if (!UNIT_WRITE_FLAGS_NOOP(flags))
1729                         u->bus_track_add = b;
1730
1731                 return 1;
1732         }
1733
1734         return 0;
1735 }
1736
1737 int bus_unit_set_properties(
1738                 Unit *u,
1739                 sd_bus_message *message,
1740                 UnitWriteFlags flags,
1741                 bool commit,
1742                 sd_bus_error *error) {
1743
1744         bool for_real = false;
1745         unsigned n = 0;
1746         int r;
1747
1748         assert(u);
1749         assert(message);
1750
1751         /* We iterate through the array twice. First run we just check
1752          * if all passed data is valid, second run actually applies
1753          * it. This is to implement transaction-like behaviour without
1754          * actually providing full transactions. */
1755
1756         r = sd_bus_message_enter_container(message, 'a', "(sv)");
1757         if (r < 0)
1758                 return r;
1759
1760         for (;;) {
1761                 const char *name;
1762                 UnitWriteFlags f;
1763
1764                 r = sd_bus_message_enter_container(message, 'r', "sv");
1765                 if (r < 0)
1766                         return r;
1767                 if (r == 0) {
1768                         if (for_real || UNIT_WRITE_FLAGS_NOOP(flags))
1769                                 break;
1770
1771                         /* Reached EOF. Let's try again, and this time for realz... */
1772                         r = sd_bus_message_rewind(message, false);
1773                         if (r < 0)
1774                                 return r;
1775
1776                         for_real = true;
1777                         continue;
1778                 }
1779
1780                 r = sd_bus_message_read(message, "s", &name);
1781                 if (r < 0)
1782                         return r;
1783
1784                 if (!UNIT_VTABLE(u)->bus_set_property)
1785                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
1786
1787                 r = sd_bus_message_enter_container(message, 'v', NULL);
1788                 if (r < 0)
1789                         return r;
1790
1791                 /* If not for real, then mask out the two target flags */
1792                 f = for_real ? flags : (flags & ~(UNIT_RUNTIME|UNIT_PERSISTENT));
1793
1794                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, f, error);
1795                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
1796                         r = bus_unit_set_transient_property(u, name, message, f, error);
1797                 if (r == 0)
1798                         r = bus_unit_set_live_property(u, name, message, f, error);
1799                 if (r < 0)
1800                         return r;
1801
1802                 if (r == 0)
1803                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
1804
1805                 r = sd_bus_message_exit_container(message);
1806                 if (r < 0)
1807                         return r;
1808
1809                 r = sd_bus_message_exit_container(message);
1810                 if (r < 0)
1811                         return r;
1812
1813                 n += for_real;
1814         }
1815
1816         r = sd_bus_message_exit_container(message);
1817         if (r < 0)
1818                 return r;
1819
1820         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
1821                 UNIT_VTABLE(u)->bus_commit_properties(u);
1822
1823         return n;
1824 }
1825
1826 int bus_unit_validate_load_state(Unit *u, sd_bus_error *error) {
1827         assert(u);
1828
1829         /* Generates a pretty error if a unit isn't properly loaded. */
1830
1831         switch (u->load_state) {
1832
1833         case UNIT_LOADED:
1834                 return 0;
1835
1836         case UNIT_NOT_FOUND:
1837                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not found.", u->id);
1838
1839         case UNIT_BAD_SETTING:
1840                 return sd_bus_error_setf(error, BUS_ERROR_BAD_UNIT_SETTING, "Unit %s has a bad unit file setting.", u->id);
1841
1842         case UNIT_ERROR: /* Only show .load_error in UNIT_ERROR state */
1843                 return sd_bus_error_set_errnof(error, u->load_error, "Unit %s failed to load properly: %m.", u->id);
1844
1845         case UNIT_MASKED:
1846                 return sd_bus_error_setf(error, BUS_ERROR_UNIT_MASKED, "Unit %s is masked.", u->id);
1847
1848         case UNIT_STUB:
1849         case UNIT_MERGED:
1850         default:
1851                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unexpected load state of unit %s", u->id);
1852         }
1853 }
1854
1855 static int bus_unit_track_handler(sd_bus_track *t, void *userdata) {
1856         Unit *u = userdata;
1857
1858         assert(t);
1859         assert(u);
1860
1861         u->bus_track = sd_bus_track_unref(u->bus_track); /* make sure we aren't called again */
1862
1863         /* If the client that tracks us disappeared, then there's reason to believe that the cgroup is empty now too,
1864          * let's see */
1865         unit_add_to_cgroup_empty_queue(u);
1866
1867         /* Also add the unit to the GC queue, after all if the client left it might be time to GC this unit */
1868         unit_add_to_gc_queue(u);
1869
1870         return 0;
1871 }
1872
1873 static int bus_unit_allocate_bus_track(Unit *u) {
1874         int r;
1875
1876         assert(u);
1877
1878         if (u->bus_track)
1879                 return 0;
1880
1881         r = sd_bus_track_new(u->manager->api_bus, &u->bus_track, bus_unit_track_handler, u);
1882         if (r < 0)
1883                 return r;
1884
1885         r = sd_bus_track_set_recursive(u->bus_track, true);
1886         if (r < 0) {
1887                 u->bus_track = sd_bus_track_unref(u->bus_track);
1888                 return r;
1889         }
1890
1891         return 0;
1892 }
1893
1894 int bus_unit_track_add_name(Unit *u, const char *name) {
1895         int r;
1896
1897         assert(u);
1898
1899         r = bus_unit_allocate_bus_track(u);
1900         if (r < 0)
1901                 return r;
1902
1903         return sd_bus_track_add_name(u->bus_track, name);
1904 }
1905
1906 int bus_unit_track_add_sender(Unit *u, sd_bus_message *m) {
1907         int r;
1908
1909         assert(u);
1910
1911         r = bus_unit_allocate_bus_track(u);
1912         if (r < 0)
1913                 return r;
1914
1915         return sd_bus_track_add_sender(u->bus_track, m);
1916 }
1917
1918 int bus_unit_track_remove_sender(Unit *u, sd_bus_message *m) {
1919         assert(u);
1920
1921         /* If we haven't allocated the bus track object yet, then there's definitely no reference taken yet, return an
1922          * error */
1923         if (!u->bus_track)
1924                 return -EUNATCH;
1925
1926         return sd_bus_track_remove_sender(u->bus_track, m);
1927 }