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 const sd_bus_vtable bus_unit_vtable[] = {
 565         SD_BUS_VTABLE_START(0),
 566
 567         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Unit, id), SD_BUS_VTABLE_PROPERTY_CONST),
 568         SD_BUS_PROPERTY("Names", "as", property_get_names, offsetof(Unit, names), SD_BUS_VTABLE_PROPERTY_CONST),
 569         SD_BUS_PROPERTY("Following", "s", property_get_following, 0, 0),
 570         SD_BUS_PROPERTY("Requires", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES]), SD_BUS_VTABLE_PROPERTY_CONST),
 571         SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), SD_BUS_VTABLE_PROPERTY_CONST),
 572         SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 573         SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 574         SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 575         SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 576         SD_BUS_PROPERTY("RequisiteOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 577         SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 578         SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 579         SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 580         SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 581         SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 582         SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), SD_BUS_VTABLE_PROPERTY_CONST),
 583         SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), SD_BUS_VTABLE_PROPERTY_CONST),
 584         SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), SD_BUS_VTABLE_PROPERTY_CONST),
 585         SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), SD_BUS_VTABLE_PROPERTY_CONST),
 586         SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 587         SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 588         SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), SD_BUS_VTABLE_PROPERTY_CONST),
 589         SD_BUS_PROPERTY("JoinsNamespaceOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_JOINS_NAMESPACE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 590         SD_BUS_PROPERTY("RequiresMountsFor", "as", property_get_requires_mounts_for, offsetof(Unit, requires_mounts_for), SD_BUS_VTABLE_PROPERTY_CONST),
 591         SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), SD_BUS_VTABLE_PROPERTY_CONST),
 592         SD_BUS_PROPERTY("Description", "s", property_get_description, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 593         SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), SD_BUS_VTABLE_PROPERTY_CONST),
 594         SD_BUS_PROPERTY("ActiveState", "s", property_get_active_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 595         SD_BUS_PROPERTY("SubState", "s", property_get_sub_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 596         SD_BUS_PROPERTY("FragmentPath", "s", NULL, offsetof(Unit, fragment_path), SD_BUS_VTABLE_PROPERTY_CONST),
 597         SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), SD_BUS_VTABLE_PROPERTY_CONST),
 598         SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), SD_BUS_VTABLE_PROPERTY_CONST),
 599         SD_BUS_PROPERTY("UnitFileState", "s", property_get_unit_file_state, 0, 0),
 600         SD_BUS_PROPERTY("UnitFilePreset", "s", property_get_unit_file_preset, 0, 0),
 601         BUS_PROPERTY_DUAL_TIMESTAMP("StateChangeTimestamp", offsetof(Unit, state_change_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 602         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveExitTimestamp", offsetof(Unit, inactive_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 603         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveEnterTimestamp", offsetof(Unit, active_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 604         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveExitTimestamp", offsetof(Unit, active_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 605         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveEnterTimestamp", offsetof(Unit, inactive_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 606         SD_BUS_PROPERTY("CanStart", "b", property_get_can_start, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 607         SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 608         SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 609         SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 610         SD_BUS_PROPERTY("Job", "(uo)", property_get_job, offsetof(Unit, job), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 611         SD_BUS_PROPERTY("StopWhenUnneeded", "b", bus_property_get_bool, offsetof(Unit, stop_when_unneeded), SD_BUS_VTABLE_PROPERTY_CONST),
 612         SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), SD_BUS_VTABLE_PROPERTY_CONST),
 613         SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), SD_BUS_VTABLE_PROPERTY_CONST),
 614         SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 615         SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), SD_BUS_VTABLE_PROPERTY_CONST),
 616         SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), SD_BUS_VTABLE_PROPERTY_CONST),
 617         SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 618         SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 619         SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
 620         SD_BUS_PROPERTY("JobRunningTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_running_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
 621         SD_BUS_PROPERTY("JobTimeoutAction", "s", property_get_emergency_action, offsetof(Unit, job_timeout_action), SD_BUS_VTABLE_PROPERTY_CONST),
 622         SD_BUS_PROPERTY("JobTimeoutRebootArgument", "s", NULL, offsetof(Unit, job_timeout_reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 623         SD_BUS_PROPERTY("ConditionResult", "b", bus_property_get_bool, offsetof(Unit, condition_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 624         SD_BUS_PROPERTY("AssertResult", "b", bus_property_get_bool, offsetof(Unit, assert_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 625         BUS_PROPERTY_DUAL_TIMESTAMP("ConditionTimestamp", offsetof(Unit, condition_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 626         BUS_PROPERTY_DUAL_TIMESTAMP("AssertTimestamp", offsetof(Unit, assert_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 627         SD_BUS_PROPERTY("Conditions", "a(sbbsi)", property_get_conditions, offsetof(Unit, conditions), 0),
 628         SD_BUS_PROPERTY("Asserts", "a(sbbsi)", property_get_conditions, offsetof(Unit, asserts), 0),
 629         SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 630         SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), SD_BUS_VTABLE_PROPERTY_CONST),
 631         SD_BUS_PROPERTY("Perpetual", "b", bus_property_get_bool, offsetof(Unit, perpetual), SD_BUS_VTABLE_PROPERTY_CONST),
 632         SD_BUS_PROPERTY("StartLimitIntervalUSec", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST),
 633         SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Unit, start_limit.burst), SD_BUS_VTABLE_PROPERTY_CONST),
 634         SD_BUS_PROPERTY("StartLimitAction", "s", property_get_emergency_action, offsetof(Unit, start_limit_action), SD_BUS_VTABLE_PROPERTY_CONST),
 635         SD_BUS_PROPERTY("FailureAction", "s", property_get_emergency_action, offsetof(Unit, failure_action), SD_BUS_VTABLE_PROPERTY_CONST),
 636         SD_BUS_PROPERTY("SuccessAction", "s", property_get_emergency_action, offsetof(Unit, success_action), SD_BUS_VTABLE_PROPERTY_CONST),
 637         SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Unit, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 638         SD_BUS_PROPERTY("InvocationID", "ay", bus_property_get_id128, offsetof(Unit, invocation_id), 0),
 639         SD_BUS_PROPERTY("CollectMode", "s", property_get_collect_mode, offsetof(Unit, collect_mode), 0),
 640
 641         SD_BUS_METHOD("Start", "s", "o", method_start, SD_BUS_VTABLE_UNPRIVILEGED),
 642         SD_BUS_METHOD("Stop", "s", "o", method_stop, SD_BUS_VTABLE_UNPRIVILEGED),
 643         SD_BUS_METHOD("Reload", "s", "o", method_reload, SD_BUS_VTABLE_UNPRIVILEGED),
 644         SD_BUS_METHOD("Restart", "s", "o", method_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 645         SD_BUS_METHOD("TryRestart", "s", "o", method_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 646         SD_BUS_METHOD("ReloadOrRestart", "s", "o", method_reload_or_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 647         SD_BUS_METHOD("ReloadOrTryRestart", "s", "o", method_reload_or_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 648         SD_BUS_METHOD("Kill", "si", NULL, bus_unit_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 649         SD_BUS_METHOD("ResetFailed", NULL, NULL, bus_unit_method_reset_failed, SD_BUS_VTABLE_UNPRIVILEGED),
 650         SD_BUS_METHOD("SetProperties", "ba(sv)", NULL, bus_unit_method_set_properties, SD_BUS_VTABLE_UNPRIVILEGED),
 651         SD_BUS_METHOD("Ref", NULL, NULL, bus_unit_method_ref, SD_BUS_VTABLE_UNPRIVILEGED),
 652         SD_BUS_METHOD("Unref", NULL, NULL, bus_unit_method_unref, SD_BUS_VTABLE_UNPRIVILEGED),
 653
 654         /* For dependency types we don't support anymore always return an empty array */
 655         SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
 656         SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
 657         SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
 658         SD_BUS_PROPERTY("RequisiteOfOverridable", "as", property_get_empty_strv, 0, SD_BUS_VTABLE_HIDDEN),
 659         /* Obsolete alias names */
 660         SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
 661         SD_BUS_PROPERTY("StartLimitIntervalSec", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
 662         SD_BUS_VTABLE_END
 663 };
 664
 665 static int property_get_slice(
 666                 sd_bus *bus,
 667                 const char *path,
 668                 const char *interface,
 669                 const char *property,
 670                 sd_bus_message *reply,
 671                 void *userdata,
 672                 sd_bus_error *error) {
 673
 674         Unit *u = userdata;
 675
 676         assert(bus);
 677         assert(reply);
 678         assert(u);
 679
 680         return sd_bus_message_append(reply, "s", unit_slice_name(u));
 681 }
 682
 683 static int property_get_current_memory(
 684                 sd_bus *bus,
 685                 const char *path,
 686                 const char *interface,
 687                 const char *property,
 688                 sd_bus_message *reply,
 689                 void *userdata,
 690                 sd_bus_error *error) {
 691
 692         uint64_t sz = (uint64_t) -1;
 693         Unit *u = userdata;
 694         int r;
 695
 696         assert(bus);
 697         assert(reply);
 698         assert(u);
 699
 700         r = unit_get_memory_current(u, &sz);
 701         if (r < 0 && r != -ENODATA)
 702                 log_unit_warning_errno(u, r, "Failed to get memory.usage_in_bytes attribute: %m");
 703
 704         return sd_bus_message_append(reply, "t", sz);
 705 }
 706
 707 static int property_get_current_tasks(
 708                 sd_bus *bus,
 709                 const char *path,
 710                 const char *interface,
 711                 const char *property,
 712                 sd_bus_message *reply,
 713                 void *userdata,
 714                 sd_bus_error *error) {
 715
 716         uint64_t cn = (uint64_t) -1;
 717         Unit *u = userdata;
 718         int r;
 719
 720         assert(bus);
 721         assert(reply);
 722         assert(u);
 723
 724         r = unit_get_tasks_current(u, &cn);
 725         if (r < 0 && r != -ENODATA)
 726                 log_unit_warning_errno(u, r, "Failed to get pids.current attribute: %m");
 727
 728         return sd_bus_message_append(reply, "t", cn);
 729 }
 730
 731 static int property_get_cpu_usage(
 732                 sd_bus *bus,
 733                 const char *path,
 734                 const char *interface,
 735                 const char *property,
 736                 sd_bus_message *reply,
 737                 void *userdata,
 738                 sd_bus_error *error) {
 739
 740         nsec_t ns = (nsec_t) -1;
 741         Unit *u = userdata;
 742         int r;
 743
 744         assert(bus);
 745         assert(reply);
 746         assert(u);
 747
 748         r = unit_get_cpu_usage(u, &ns);
 749         if (r < 0 && r != -ENODATA)
 750                 log_unit_warning_errno(u, r, "Failed to get cpuacct.usage attribute: %m");
 751
 752         return sd_bus_message_append(reply, "t", ns);
 753 }
 754
 755 static int property_get_cgroup(
 756                 sd_bus *bus,
 757                 const char *path,
 758                 const char *interface,
 759                 const char *property,
 760                 sd_bus_message *reply,
 761                 void *userdata,
 762                 sd_bus_error *error) {
 763
 764         Unit *u = userdata;
 765         const char *t = NULL;
 766
 767         assert(bus);
 768         assert(reply);
 769         assert(u);
 770
 771         /* Three cases: a) u->cgroup_path is NULL, in which case the
 772          * unit has no control group, which we report as the empty
 773          * string. b) u->cgroup_path is the empty string, which
 774          * indicates the root cgroup, which we report as "/". c) all
 775          * other cases we report as-is. */
 776
 777         if (u->cgroup_path)
 778                 t = empty_to_root(u->cgroup_path);
 779
 780         return sd_bus_message_append(reply, "s", t);
 781 }
 782
 783 static int append_process(sd_bus_message *reply, const char *p, pid_t pid, Set *pids) {
 784         _cleanup_free_ char *buf = NULL, *cmdline = NULL;
 785         int r;
 786
 787         assert(reply);
 788         assert(pid > 0);
 789
 790         r = set_put(pids, PID_TO_PTR(pid));
 791         if (IN_SET(r, 0, -EEXIST))
 792                 return 0;
 793         if (r < 0)
 794                 return r;
 795
 796         if (!p) {
 797                 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &buf);
 798                 if (r == -ESRCH)
 799                         return 0;
 800                 if (r < 0)
 801                         return r;
 802
 803                 p = buf;
 804         }
 805
 806         (void) get_process_cmdline(pid, 0, true, &cmdline);
 807
 808         return sd_bus_message_append(reply,
 809                                      "(sus)",
 810                                      p,
 811                                      (uint32_t) pid,
 812                                      cmdline);
 813 }
 814
 815 static int append_cgroup(sd_bus_message *reply, const char *p, Set *pids) {
 816         _cleanup_closedir_ DIR *d = NULL;
 817         _cleanup_fclose_ FILE *f = NULL;
 818         int r;
 819
 820         assert(reply);
 821         assert(p);
 822
 823         r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, p, &f);
 824         if (r == -ENOENT)
 825                 return 0;
 826         if (r < 0)
 827                 return r;
 828
 829         for (;;) {
 830                 pid_t pid;
 831
 832                 r = cg_read_pid(f, &pid);
 833                 if (r < 0)
 834                         return r;
 835                 if (r == 0)
 836                         break;
 837
 838                 if (is_kernel_thread(pid) > 0)
 839                         continue;
 840
 841                 r = append_process(reply, p, pid, pids);
 842                 if (r < 0)
 843                         return r;
 844         }
 845
 846         r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, p, &d);
 847         if (r == -ENOENT)
 848                 return 0;
 849         if (r < 0)
 850                 return r;
 851
 852         for (;;) {
 853                 _cleanup_free_ char *g = NULL, *j = NULL;
 854
 855                 r = cg_read_subgroup(d, &g);
 856                 if (r < 0)
 857                         return r;
 858                 if (r == 0)
 859                         break;
 860
 861                 j = strjoin(p, "/", g);
 862                 if (!j)
 863                         return -ENOMEM;
 864
 865                 r = append_cgroup(reply, j, pids);
 866                 if (r < 0)
 867                         return r;
 868         }
 869
 870         return 0;
 871 }
 872
 873 int bus_unit_method_get_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 874         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 875         _cleanup_set_free_ Set *pids = NULL;
 876         Unit *u = userdata;
 877         pid_t pid;
 878         int r;
 879
 880         assert(message);
 881
 882         r = mac_selinux_unit_access_check(u, message, "status", error);
 883         if (r < 0)
 884                 return r;
 885
 886         pids = set_new(NULL);
 887         if (!pids)
 888                 return -ENOMEM;
 889
 890         r = sd_bus_message_new_method_return(message, &reply);
 891         if (r < 0)
 892                 return r;
 893
 894         r = sd_bus_message_open_container(reply, 'a', "(sus)");
 895         if (r < 0)
 896                 return r;
 897
 898         if (u->cgroup_path) {
 899                 r = append_cgroup(reply, u->cgroup_path, pids);
 900                 if (r < 0)
 901                         return r;
 902         }
 903
 904         /* The main and control pids might live outside of the cgroup, hence fetch them separately */
 905         pid = unit_main_pid(u);
 906         if (pid > 0) {
 907                 r = append_process(reply, NULL, pid, pids);
 908                 if (r < 0)
 909                         return r;
 910         }
 911
 912         pid = unit_control_pid(u);
 913         if (pid > 0) {
 914                 r = append_process(reply, NULL, pid, pids);
 915                 if (r < 0)
 916                         return r;
 917         }
 918
 919         r = sd_bus_message_close_container(reply);
 920         if (r < 0)
 921                 return r;
 922
 923         return sd_bus_send(NULL, reply, NULL);
 924 }
 925
 926 static int property_get_ip_counter(
 927                 sd_bus *bus,
 928                 const char *path,
 929                 const char *interface,
 930                 const char *property,
 931                 sd_bus_message *reply,
 932                 void *userdata,
 933                 sd_bus_error *error) {
 934
 935         CGroupIPAccountingMetric metric;
 936         uint64_t value = (uint64_t) -1;
 937         Unit *u = userdata;
 938
 939         assert(bus);
 940         assert(reply);
 941         assert(property);
 942         assert(u);
 943
 944         if (streq(property, "IPIngressBytes"))
 945                 metric = CGROUP_IP_INGRESS_BYTES;
 946         else if (streq(property, "IPIngressPackets"))
 947                 metric = CGROUP_IP_INGRESS_PACKETS;
 948         else if (streq(property, "IPEgressBytes"))
 949                 metric = CGROUP_IP_EGRESS_BYTES;
 950         else {
 951                 assert(streq(property, "IPEgressPackets"));
 952                 metric = CGROUP_IP_EGRESS_PACKETS;
 953         }
 954
 955         (void) unit_get_ip_accounting(u, metric, &value);
 956         return sd_bus_message_append(reply, "t", value);
 957 }
 958
 959 int bus_unit_method_attach_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 960
 961         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 962         _cleanup_set_free_ Set *pids = NULL;
 963         Unit *u = userdata;
 964         const char *path;
 965         int r;
 966
 967         assert(message);
 968
 969         /* This migrates the processes with the specified PIDs into the cgroup of this unit, optionally below a
 970          * specified cgroup path. Obviously this only works for units that actually maintain a cgroup
 971          * representation. If a process is already in the cgroup no operation is executed – in this case the specified
 972          * subcgroup path has no effect! */
 973
 974         r = mac_selinux_unit_access_check(u, message, "start", error);
 975         if (r < 0)
 976                 return r;
 977
 978         r = sd_bus_message_read(message, "s", &path);
 979         if (r < 0)
 980                 return r;
 981
 982         path = empty_to_null(path);
 983         if (path) {
 984                 if (!path_is_absolute(path))
 985                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Control group path is not absolute: %s", path);
 986
 987                 if (!path_is_normalized(path))
 988                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Control group path is not normalized: %s", path);
 989         }
 990
 991         if (!unit_cgroup_delegate(u))
 992                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Process migration not available on non-delegated units.");
 993
 994         if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(u)))
 995                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit is not active, refusing.");
 996
 997         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID, &creds);
 998         if (r < 0)
 999                 return r;
1000
1001         r = sd_bus_message_enter_container(message, 'a', "u");
1002         if (r < 0)
1003                 return r;
1004         for (;;) {
1005                 uid_t process_uid, sender_uid;
1006                 uint32_t upid;
1007                 pid_t pid;
1008
1009                 r = sd_bus_message_read(message, "u", &upid);
1010                 if (r < 0)
1011                         return r;
1012                 if (r == 0)
1013                         break;
1014
1015                 if (upid == 0) {
1016                         r = sd_bus_creds_get_pid(creds, &pid);
1017                         if (r < 0)
1018                                 return r;
1019                 } else
1020                         pid = (uid_t) upid;
1021
1022                 /* Filter out duplicates */
1023                 if (set_contains(pids, PID_TO_PTR(pid)))
1024                         continue;
1025
1026                 /* Check if this process is suitable for attaching to this unit */
1027                 r = unit_pid_attachable(u, pid, error);
1028                 if (r < 0)
1029                         return r;
1030
1031                 /* Let's query the sender's UID, so that we can make our security decisions */
1032                 r = sd_bus_creds_get_euid(creds, &sender_uid);
1033                 if (r < 0)
1034                         return r;
1035
1036                 /* Let's validate security: if the sender is root, then all is OK. If the sender is any other unit,
1037                  * then the process' UID and the target unit's UID have to match the sender's UID */
1038                 if (sender_uid != 0 && sender_uid != getuid()) {
1039                         r = get_process_uid(pid, &process_uid);
1040                         if (r < 0)
1041                                 return sd_bus_error_set_errnof(error, r, "Failed to retrieve process UID: %m");
1042
1043                         if (process_uid != sender_uid)
1044                                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Process " PID_FMT " not owned by client's UID. Refusing.", pid);
1045                         if (process_uid != u->ref_uid)
1046                                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Process " PID_FMT " not owned by target unit's UID. Refusing.", pid);
1047                 }
1048
1049                 if (!pids) {
1050                         pids = set_new(NULL);
1051                         if (!pids)
1052                                 return -ENOMEM;
1053                 }
1054
1055                 r = set_put(pids, PID_TO_PTR(pid));
1056                 if (r < 0)
1057                         return r;
1058         }
1059
1060         r = sd_bus_message_exit_container(message);
1061         if (r < 0)
1062                 return r;
1063
1064         r = unit_attach_pids_to_cgroup(u, pids, path);
1065         if (r < 0)
1066                 return sd_bus_error_set_errnof(error, r, "Failed to attach processes to control group: %m");
1067
1068         return sd_bus_reply_method_return(message, NULL);
1069 }
1070
1071 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
1072         SD_BUS_VTABLE_START(0),
1073         SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
1074         SD_BUS_PROPERTY("ControlGroup", "s", property_get_cgroup, 0, 0),
1075         SD_BUS_PROPERTY("MemoryCurrent", "t", property_get_current_memory, 0, 0),
1076         SD_BUS_PROPERTY("CPUUsageNSec", "t", property_get_cpu_usage, 0, 0),
1077         SD_BUS_PROPERTY("TasksCurrent", "t", property_get_current_tasks, 0, 0),
1078         SD_BUS_PROPERTY("IPIngressBytes", "t", property_get_ip_counter, 0, 0),
1079         SD_BUS_PROPERTY("IPIngressPackets", "t", property_get_ip_counter, 0, 0),
1080         SD_BUS_PROPERTY("IPEgressBytes", "t", property_get_ip_counter, 0, 0),
1081         SD_BUS_PROPERTY("IPEgressPackets", "t", property_get_ip_counter, 0, 0),
1082         SD_BUS_METHOD("GetProcesses", NULL, "a(sus)", bus_unit_method_get_processes, SD_BUS_VTABLE_UNPRIVILEGED),
1083         SD_BUS_METHOD("AttachProcesses", "sau", NULL, bus_unit_method_attach_processes, SD_BUS_VTABLE_UNPRIVILEGED),
1084         SD_BUS_VTABLE_END
1085 };
1086
1087 static int send_new_signal(sd_bus *bus, void *userdata) {
1088         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1089         _cleanup_free_ char *p = NULL;
1090         Unit *u = userdata;
1091         int r;
1092
1093         assert(bus);
1094         assert(u);
1095
1096         p = unit_dbus_path(u);
1097         if (!p)
1098                 return -ENOMEM;
1099
1100         r = sd_bus_message_new_signal(
1101                         bus,
1102                         &m,
1103                         "/org/freedesktop/systemd1",
1104                         "org.freedesktop.systemd1.Manager",
1105                         "UnitNew");
1106         if (r < 0)
1107                 return r;
1108
1109         r = sd_bus_message_append(m, "so", u->id, p);
1110         if (r < 0)
1111                 return r;
1112
1113         return sd_bus_send(bus, m, NULL);
1114 }
1115
1116 static int send_changed_signal(sd_bus *bus, void *userdata) {
1117         _cleanup_free_ char *p = NULL;
1118         Unit *u = userdata;
1119         int r;
1120
1121         assert(bus);
1122         assert(u);
1123
1124         p = unit_dbus_path(u);
1125         if (!p)
1126                 return -ENOMEM;
1127
1128         /* Send a properties changed signal. First for the specific
1129          * type, then for the generic unit. The clients may rely on
1130          * this order to get atomic behavior if needed. */
1131
1132         r = sd_bus_emit_properties_changed_strv(
1133                         bus, p,
1134                         unit_dbus_interface_from_type(u->type),
1135                         NULL);
1136         if (r < 0)
1137                 return r;
1138
1139         return sd_bus_emit_properties_changed_strv(
1140                         bus, p,
1141                         "org.freedesktop.systemd1.Unit",
1142                         NULL);
1143 }
1144
1145 void bus_unit_send_change_signal(Unit *u) {
1146         int r;
1147         assert(u);
1148
1149         if (u->in_dbus_queue) {
1150                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
1151                 u->in_dbus_queue = false;
1152         }
1153
1154         if (!u->id)
1155                 return;
1156
1157         r = bus_foreach_bus(u->manager, u->bus_track, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
1158         if (r < 0)
1159                 log_unit_debug_errno(u, r, "Failed to send unit change signal for %s: %m", u->id);
1160
1161         u->sent_dbus_new_signal = true;
1162 }
1163
1164 static int send_removed_signal(sd_bus *bus, void *userdata) {
1165         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1166         _cleanup_free_ char *p = NULL;
1167         Unit *u = userdata;
1168         int r;
1169
1170         assert(bus);
1171         assert(u);
1172
1173         p = unit_dbus_path(u);
1174         if (!p)
1175                 return -ENOMEM;
1176
1177         r = sd_bus_message_new_signal(
1178                         bus,
1179                         &m,
1180                         "/org/freedesktop/systemd1",
1181                         "org.freedesktop.systemd1.Manager",
1182                         "UnitRemoved");
1183         if (r < 0)
1184                 return r;
1185
1186         r = sd_bus_message_append(m, "so", u->id, p);
1187         if (r < 0)
1188                 return r;
1189
1190         return sd_bus_send(bus, m, NULL);
1191 }
1192
1193 void bus_unit_send_removed_signal(Unit *u) {
1194         int r;
1195         assert(u);
1196
1197         if (!u->sent_dbus_new_signal || u->in_dbus_queue)
1198                 bus_unit_send_change_signal(u);
1199
1200         if (!u->id)
1201                 return;
1202
1203         r = bus_foreach_bus(u->manager, u->bus_track, send_removed_signal, u);
1204         if (r < 0)
1205                 log_unit_debug_errno(u, r, "Failed to send unit remove signal for %s: %m", u->id);
1206 }
1207
1208 int bus_unit_queue_job(
1209                 sd_bus_message *message,
1210                 Unit *u,
1211                 JobType type,
1212                 JobMode mode,
1213                 bool reload_if_possible,
1214                 sd_bus_error *error) {
1215
1216         _cleanup_free_ char *path = NULL;
1217         Job *j;
1218         int r;
1219
1220         assert(message);
1221         assert(u);
1222         assert(type >= 0 && type < _JOB_TYPE_MAX);
1223         assert(mode >= 0 && mode < _JOB_MODE_MAX);
1224
1225         r = mac_selinux_unit_access_check(
1226                         u, message,
1227                         job_type_to_access_method(type),
1228                         error);
1229         if (r < 0)
1230                 return r;
1231
1232         if (reload_if_possible && unit_can_reload(u)) {
1233                 if (type == JOB_RESTART)
1234                         type = JOB_RELOAD_OR_START;
1235                 else if (type == JOB_TRY_RESTART)
1236                         type = JOB_TRY_RELOAD;
1237         }
1238
1239         if (type == JOB_STOP &&
1240             IN_SET(u->load_state, UNIT_NOT_FOUND, UNIT_ERROR, UNIT_BAD_SETTING) &&
1241             unit_active_state(u) == UNIT_INACTIVE)
1242                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
1243
1244         if ((type == JOB_START && u->refuse_manual_start) ||
1245             (type == JOB_STOP && u->refuse_manual_stop) ||
1246             (IN_SET(type, JOB_RESTART, JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)) ||
1247             (type == JOB_RELOAD_OR_START && job_type_collapse(type, u) == JOB_START && u->refuse_manual_start))
1248                 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);
1249
1250         r = manager_add_job(u->manager, type, u, mode, error, &j);
1251         if (r < 0)
1252                 return r;
1253
1254         r = bus_job_track_sender(j, message);
1255         if (r < 0)
1256                 return r;
1257
1258         path = job_dbus_path(j);
1259         if (!path)
1260                 return -ENOMEM;
1261
1262         return sd_bus_reply_method_return(message, "o", path);
1263 }
1264
1265 static int bus_unit_set_live_property(
1266                 Unit *u,
1267                 const char *name,
1268                 sd_bus_message *message,
1269                 UnitWriteFlags flags,
1270                 sd_bus_error *error) {
1271
1272         int r;
1273
1274         assert(u);
1275         assert(name);
1276         assert(message);
1277
1278         /* Handles setting properties both "live" (i.e. at any time during runtime), and during creation (for transient
1279          * units that are being created). */
1280
1281         if (streq(name, "Description")) {
1282                 const char *d;
1283
1284                 r = sd_bus_message_read(message, "s", &d);
1285                 if (r < 0)
1286                         return r;
1287
1288                 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1289                         r = unit_set_description(u, d);
1290                         if (r < 0)
1291                                 return r;
1292
1293                         unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "Description=%s", d);
1294                 }
1295
1296                 return 1;
1297         }
1298
1299         return 0;
1300 }
1301
1302 static int bus_set_transient_emergency_action(
1303                 Unit *u,
1304                 const char *name,
1305                 EmergencyAction *p,
1306                 sd_bus_message *message,
1307                 UnitWriteFlags flags,
1308                 sd_bus_error *error) {
1309
1310         const char *s;
1311         EmergencyAction v;
1312         int r;
1313         bool system;
1314
1315         assert(p);
1316
1317         r = sd_bus_message_read(message, "s", &s);
1318         if (r < 0)
1319                 return r;
1320
1321         system = MANAGER_IS_SYSTEM(u->manager);
1322         r = parse_emergency_action(s, system, &v);
1323         if (v < 0)
1324                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS,
1325                                          v == -EOPNOTSUPP ? "EmergencyAction setting invalid for manager type: %s"
1326                                                           : "Invalid %s setting: %s",
1327                                          name, s);
1328
1329         if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1330                 *p = v;
1331                 unit_write_settingf(u, flags, name,
1332                                     "%s=%s", name, s);
1333         }
1334
1335         return 1;
1336 }
1337
1338 static BUS_DEFINE_SET_TRANSIENT_PARSE(collect_mode, CollectMode, collect_mode_from_string);
1339 static BUS_DEFINE_SET_TRANSIENT_PARSE(job_mode, JobMode, job_mode_from_string);
1340
1341 static int bus_set_transient_conditions(
1342                 Unit *u,
1343                 const char *name,
1344                 Condition **list,
1345                 bool is_condition,
1346                 sd_bus_message *message,
1347                 UnitWriteFlags flags,
1348                 sd_bus_error *error) {
1349
1350         const char *type_name, *param;
1351         int trigger, negate, r;
1352         bool empty = true;
1353
1354         assert(list);
1355
1356         r = sd_bus_message_enter_container(message, 'a', "(sbbs)");
1357         if (r < 0)
1358                 return r;
1359
1360         while ((r = sd_bus_message_read(message, "(sbbs)", &type_name, &trigger, &negate, &param)) > 0) {
1361                 ConditionType t;
1362
1363                 t = is_condition ? condition_type_from_string(type_name) : assert_type_from_string(type_name);
1364                 if (t < 0)
1365                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid condition type: %s", type_name);
1366
1367                 if (t != CONDITION_NULL) {
1368                         if (isempty(param))
1369                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Condition parameter in %s is empty", type_name);
1370
1371                         if (condition_takes_path(t) && !path_is_absolute(param))
1372                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path in condition %s is not absolute: %s", type_name, param);
1373                 } else
1374                         param = NULL;
1375
1376                 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1377                         Condition *c;
1378
1379                         c = condition_new(t, param, trigger, negate);
1380                         if (!c)
1381                                 return -ENOMEM;
1382
1383                         LIST_PREPEND(conditions, *list, c);
1384
1385                         if (t != CONDITION_NULL)
1386                                 unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name,
1387                                                     "%s=%s%s%s", type_name,
1388                                                     trigger ? "|" : "", negate ? "!" : "", param);
1389                         else
1390                                 unit_write_settingf(u, flags, name,
1391                                                     "%s=%s%s", type_name,
1392                                                     trigger ? "|" : "", yes_no(!negate));
1393                 }
1394
1395                 empty = false;
1396         }
1397         if (r < 0)
1398                 return r;
1399
1400         r = sd_bus_message_exit_container(message);
1401         if (r < 0)
1402                 return r;
1403
1404         if (!UNIT_WRITE_FLAGS_NOOP(flags) && empty) {
1405                 *list = condition_free_list(*list);
1406                 unit_write_settingf(u, flags, name, "%sNull=", is_condition ? "Condition" : "Assert");
1407         }
1408
1409         return 1;
1410 }
1411
1412 static int bus_unit_set_transient_property(
1413                 Unit *u,
1414                 const char *name,
1415                 sd_bus_message *message,
1416                 UnitWriteFlags flags,
1417                 sd_bus_error *error) {
1418
1419         UnitDependency d = _UNIT_DEPENDENCY_INVALID;
1420         int r;
1421
1422         assert(u);
1423         assert(name);
1424         assert(message);
1425
1426         /* Handles settings when transient units are created. This settings cannot be altered anymore after the unit
1427          * has been created. */
1428
1429         if (streq(name, "SourcePath"))
1430                 return bus_set_transient_path(u, name, &u->source_path, message, flags, error);
1431
1432         if (streq(name, "StopWhenUnneeded"))
1433                 return bus_set_transient_bool(u, name, &u->stop_when_unneeded, message, flags, error);
1434
1435         if (streq(name, "RefuseManualStart"))
1436                 return bus_set_transient_bool(u, name, &u->refuse_manual_start, message, flags, error);
1437
1438         if (streq(name, "RefuseManualStop"))
1439                 return bus_set_transient_bool(u, name, &u->refuse_manual_stop, message, flags, error);
1440
1441         if (streq(name, "AllowIsolate"))
1442                 return bus_set_transient_bool(u, name, &u->allow_isolate, message, flags, error);
1443
1444         if (streq(name, "DefaultDependencies"))
1445                 return bus_set_transient_bool(u, name, &u->default_dependencies, message, flags, error);
1446
1447         if (streq(name, "OnFailureJobMode"))
1448                 return bus_set_transient_job_mode(u, name, &u->on_failure_job_mode, message, flags, error);
1449
1450         if (streq(name, "IgnoreOnIsolate"))
1451                 return bus_set_transient_bool(u, name, &u->ignore_on_isolate, message, flags, error);
1452
1453         if (streq(name, "JobTimeoutUSec")) {
1454                 r = bus_set_transient_usec_fix_0(u, name, &u->job_timeout, message, flags, error);
1455                 if (r >= 0 && !UNIT_WRITE_FLAGS_NOOP(flags) && !u->job_running_timeout_set)
1456                         u->job_running_timeout = u->job_timeout;
1457         }
1458
1459         if (streq(name, "JobRunningTimeoutUSec")) {
1460                 r = bus_set_transient_usec_fix_0(u, name, &u->job_running_timeout, message, flags, error);
1461                 if (r >= 0 && !UNIT_WRITE_FLAGS_NOOP(flags))
1462                         u->job_running_timeout_set = true;
1463
1464                 return r;
1465         }
1466
1467         if (streq(name, "JobTimeoutAction"))
1468                 return bus_set_transient_emergency_action(u, name, &u->job_timeout_action, message, flags, error);
1469
1470         if (streq(name, "JobTimeoutRebootArgument"))
1471                 return bus_set_transient_string(u, name, &u->job_timeout_reboot_arg, message, flags, error);
1472
1473         if (streq(name, "StartLimitIntervalUSec"))
1474                 return bus_set_transient_usec(u, name, &u->start_limit.interval, message, flags, error);
1475
1476         if (streq(name, "StartLimitBurst"))
1477                 return bus_set_transient_unsigned(u, name, &u->start_limit.burst, message, flags, error);
1478
1479         if (streq(name, "StartLimitAction"))
1480                 return bus_set_transient_emergency_action(u, name, &u->start_limit_action, message, flags, error);
1481
1482         if (streq(name, "FailureAction"))
1483                 return bus_set_transient_emergency_action(u, name, &u->failure_action, message, flags, error);
1484
1485         if (streq(name, "SuccessAction"))
1486                 return bus_set_transient_emergency_action(u, name, &u->success_action, message, flags, error);
1487
1488         if (streq(name, "RebootArgument"))
1489                 return bus_set_transient_string(u, name, &u->reboot_arg, message, flags, error);
1490
1491         if (streq(name, "CollectMode"))
1492                 return bus_set_transient_collect_mode(u, name, &u->collect_mode, message, flags, error);
1493
1494         if (streq(name, "Conditions"))
1495                 return bus_set_transient_conditions(u, name, &u->conditions, true, message, flags, error);
1496
1497         if (streq(name, "Asserts"))
1498                 return bus_set_transient_conditions(u, name, &u->asserts, false, message, flags, error);
1499
1500         if (streq(name, "Documentation")) {
1501                 _cleanup_strv_free_ char **l = NULL;
1502                 char **p;
1503
1504                 r = sd_bus_message_read_strv(message, &l);
1505                 if (r < 0)
1506                         return r;
1507
1508                 STRV_FOREACH(p, l) {
1509                         if (!documentation_url_is_valid(*p))
1510                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid URL in %s: %s", name, *p);
1511                 }
1512
1513                 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1514                         if (strv_isempty(l)) {
1515                                 u->documentation = strv_free(u->documentation);
1516                                 unit_write_settingf(u, flags, name, "%s=", name);
1517                         } else {
1518                                 strv_extend_strv(&u->documentation, l, false);
1519
1520                                 STRV_FOREACH(p, l)
1521                                         unit_write_settingf(u, flags, name, "%s=%s", name, *p);
1522                         }
1523                 }
1524
1525                 return 1;
1526
1527         } else if (streq(name, "Slice")) {
1528                 Unit *slice;
1529                 const char *s;
1530
1531                 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1532                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "The slice property is only available for units with control groups.");
1533                 if (u->type == UNIT_SLICE)
1534                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Slice may not be set for slice units.");
1535                 if (unit_has_name(u, SPECIAL_INIT_SCOPE))
1536                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot set slice for init.scope");
1537
1538                 r = sd_bus_message_read(message, "s", &s);
1539                 if (r < 0)
1540                         return r;
1541
1542                 if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
1543                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name '%s'", s);
1544
1545                 /* Note that we do not dispatch the load queue here yet, as we don't want our own transient unit to be
1546                  * loaded while we are still setting it up. Or in other words, we use manager_load_unit_prepare()
1547                  * instead of manager_load_unit() on purpose, here. */
1548                 r = manager_load_unit_prepare(u->manager, s, NULL, error, &slice);
1549                 if (r < 0)
1550                         return r;
1551
1552                 if (slice->type != UNIT_SLICE)
1553                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit name '%s' is not a slice", s);
1554
1555                 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1556                         r = unit_set_slice(u, slice);
1557                         if (r < 0)
1558                                 return r;
1559
1560                         unit_write_settingf(u, flags|UNIT_PRIVATE, name, "Slice=%s", s);
1561                 }
1562
1563                 return 1;
1564
1565         } else if (streq(name, "RequiresMountsFor")) {
1566                 _cleanup_strv_free_ char **l = NULL;
1567                 char **p;
1568
1569                 r = sd_bus_message_read_strv(message, &l);
1570                 if (r < 0)
1571                         return r;
1572
1573                 STRV_FOREACH(p, l) {
1574                         if (!path_is_absolute(*p))
1575                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path specified in %s is not absolute: %s", name, *p);
1576
1577                         if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1578                                 r = unit_require_mounts_for(u, *p, UNIT_DEPENDENCY_FILE);
1579                                 if (r < 0)
1580                                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Failed to add required mount \"%s\": %m", *p);
1581
1582                                 unit_write_settingf(u, flags, name, "%s=%s", name, *p);
1583                         }
1584                 }
1585
1586                 return 1;
1587         }
1588
1589         if (streq(name, "RequiresOverridable"))
1590                 d = UNIT_REQUIRES; /* redirect for obsolete unit dependency type */
1591         else if (streq(name, "RequisiteOverridable"))
1592                 d = UNIT_REQUISITE; /* same here */
1593         else
1594                 d = unit_dependency_from_string(name);
1595
1596         if (d >= 0) {
1597                 const char *other;
1598
1599                 r = sd_bus_message_enter_container(message, 'a', "s");
1600                 if (r < 0)
1601                         return r;
1602
1603                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
1604                         if (!unit_name_is_valid(other, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
1605                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
1606
1607                         if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
1608                                 _cleanup_free_ char *label = NULL;
1609
1610                                 r = unit_add_dependency_by_name(u, d, other, true, UNIT_DEPENDENCY_FILE);
1611                                 if (r < 0)
1612                                         return r;
1613
1614                                 label = strjoin(name, "-", other);
1615                                 if (!label)
1616                                         return -ENOMEM;
1617
1618                                 unit_write_settingf(u, flags, label, "%s=%s", unit_dependency_to_string(d), other);
1619                         }
1620
1621                 }
1622                 if (r < 0)
1623                         return r;
1624
1625                 r = sd_bus_message_exit_container(message);
1626                 if (r < 0)
1627                         return r;
1628
1629                 return 1;
1630
1631         } else if (streq(name, "AddRef")) {
1632
1633                 int b;
1634
1635                 /* Why is this called "AddRef" rather than just "Ref", or "Reference"? There's already a "Ref()" method
1636                  * on the Unit interface, and it's probably not a good idea to expose a property and a method on the
1637                  * same interface (well, strictly speaking AddRef isn't exposed as full property, we just read it for
1638                  * transient units, but still). And "References" and "ReferencedBy" is already used as unit reference
1639                  * dependency type, hence let's not confuse things with that.
1640                  *
1641                  * Note that we don't acually add the reference to the bus track. We do that only after the setup of
1642                  * the transient unit is complete, so that setting this property multiple times in the same transient
1643                  * unit creation call doesn't count as individual references. */
1644
1645                 r = sd_bus_message_read(message, "b", &b);
1646                 if (r < 0)
1647                         return r;
1648
1649                 if (!UNIT_WRITE_FLAGS_NOOP(flags))
1650                         u->bus_track_add = b;
1651
1652                 return 1;
1653         }
1654
1655         return 0;
1656 }
1657
1658 int bus_unit_set_properties(
1659                 Unit *u,
1660                 sd_bus_message *message,
1661                 UnitWriteFlags flags,
1662                 bool commit,
1663                 sd_bus_error *error) {
1664
1665         bool for_real = false;
1666         unsigned n = 0;
1667         int r;
1668
1669         assert(u);
1670         assert(message);
1671
1672         /* We iterate through the array twice. First run we just check
1673          * if all passed data is valid, second run actually applies
1674          * it. This is to implement transaction-like behaviour without
1675          * actually providing full transactions. */
1676
1677         r = sd_bus_message_enter_container(message, 'a', "(sv)");
1678         if (r < 0)
1679                 return r;
1680
1681         for (;;) {
1682                 const char *name;
1683                 UnitWriteFlags f;
1684
1685                 r = sd_bus_message_enter_container(message, 'r', "sv");
1686                 if (r < 0)
1687                         return r;
1688                 if (r == 0) {
1689                         if (for_real || UNIT_WRITE_FLAGS_NOOP(flags))
1690                                 break;
1691
1692                         /* Reached EOF. Let's try again, and this time for realz... */
1693                         r = sd_bus_message_rewind(message, false);
1694                         if (r < 0)
1695                                 return r;
1696
1697                         for_real = true;
1698                         continue;
1699                 }
1700
1701                 r = sd_bus_message_read(message, "s", &name);
1702                 if (r < 0)
1703                         return r;
1704
1705                 if (!UNIT_VTABLE(u)->bus_set_property)
1706                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
1707
1708                 r = sd_bus_message_enter_container(message, 'v', NULL);
1709                 if (r < 0)
1710                         return r;
1711
1712                 /* If not for real, then mask out the two target flags */
1713                 f = for_real ? flags : (flags & ~(UNIT_RUNTIME|UNIT_PERSISTENT));
1714
1715                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, f, error);
1716                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
1717                         r = bus_unit_set_transient_property(u, name, message, f, error);
1718                 if (r == 0)
1719                         r = bus_unit_set_live_property(u, name, message, f, error);
1720                 if (r < 0)
1721                         return r;
1722
1723                 if (r == 0)
1724                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
1725
1726                 r = sd_bus_message_exit_container(message);
1727                 if (r < 0)
1728                         return r;
1729
1730                 r = sd_bus_message_exit_container(message);
1731                 if (r < 0)
1732                         return r;
1733
1734                 n += for_real;
1735         }
1736
1737         r = sd_bus_message_exit_container(message);
1738         if (r < 0)
1739                 return r;
1740
1741         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
1742                 UNIT_VTABLE(u)->bus_commit_properties(u);
1743
1744         return n;
1745 }
1746
1747 int bus_unit_validate_load_state(Unit *u, sd_bus_error *error) {
1748         assert(u);
1749
1750         /* Generates a pretty error if a unit isn't properly loaded. */
1751
1752         switch (u->load_state) {
1753
1754         case UNIT_LOADED:
1755                 return 0;
1756
1757         case UNIT_NOT_FOUND:
1758                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not found.", u->id);
1759
1760         case UNIT_BAD_SETTING:
1761                 return sd_bus_error_setf(error, BUS_ERROR_BAD_UNIT_SETTING, "Unit %s has a bad unit file setting.", u->id);
1762
1763         case UNIT_ERROR: /* Only show .load_error in UNIT_ERROR state */
1764                 return sd_bus_error_set_errnof(error, u->load_error, "Unit %s failed to load properly: %m.", u->id);
1765
1766         case UNIT_MASKED:
1767                 return sd_bus_error_setf(error, BUS_ERROR_UNIT_MASKED, "Unit %s is masked.", u->id);
1768
1769         case UNIT_STUB:
1770         case UNIT_MERGED:
1771         default:
1772                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unexpected load state of unit %s", u->id);
1773         }
1774 }
1775
1776 static int bus_unit_track_handler(sd_bus_track *t, void *userdata) {
1777         Unit *u = userdata;
1778
1779         assert(t);
1780         assert(u);
1781
1782         u->bus_track = sd_bus_track_unref(u->bus_track); /* make sure we aren't called again */
1783
1784         unit_add_to_gc_queue(u);
1785         return 0;
1786 }
1787
1788 static int bus_unit_allocate_bus_track(Unit *u) {
1789         int r;
1790
1791         assert(u);
1792
1793         if (u->bus_track)
1794                 return 0;
1795
1796         r = sd_bus_track_new(u->manager->api_bus, &u->bus_track, bus_unit_track_handler, u);
1797         if (r < 0)
1798                 return r;
1799
1800         r = sd_bus_track_set_recursive(u->bus_track, true);
1801         if (r < 0) {
1802                 u->bus_track = sd_bus_track_unref(u->bus_track);
1803                 return r;
1804         }
1805
1806         return 0;
1807 }
1808
1809 int bus_unit_track_add_name(Unit *u, const char *name) {
1810         int r;
1811
1812         assert(u);
1813
1814         r = bus_unit_allocate_bus_track(u);
1815         if (r < 0)
1816                 return r;
1817
1818         return sd_bus_track_add_name(u->bus_track, name);
1819 }
1820
1821 int bus_unit_track_add_sender(Unit *u, sd_bus_message *m) {
1822         int r;
1823
1824         assert(u);
1825
1826         r = bus_unit_allocate_bus_track(u);
1827         if (r < 0)
1828                 return r;
1829
1830         return sd_bus_track_add_sender(u->bus_track, m);
1831 }
1832
1833 int bus_unit_track_remove_sender(Unit *u, sd_bus_message *m) {
1834         assert(u);
1835
1836         /* If we haven't allocated the bus track object yet, then there's definitely no reference taken yet, return an
1837          * error */
1838         if (!u->bus_track)
1839                 return -EUNATCH;
1840
1841         return sd_bus_track_remove_sender(u->bus_track, m);
1842 }