src/core/dbus-unit.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "sd-bus.h"
  21
  22 #include "alloc-util.h"
  23 #include "bus-common-errors.h"
  24 #include "cgroup-util.h"
  25 #include "dbus-unit.h"
  26 #include "dbus.h"
  27 #include "fd-util.h"
  28 #include "locale-util.h"
  29 #include "log.h"
  30 #include "process-util.h"
  31 #include "selinux-access.h"
  32 #include "signal-util.h"
  33 #include "special.h"
  34 #include "string-util.h"
  35 #include "strv.h"
  36 #include "user-util.h"
  37
  38 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_load_state, unit_load_state, UnitLoadState);
  39 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_job_mode, job_mode, JobMode);
  40 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_emergency_action, emergency_action, EmergencyAction);
  41
  42 static int property_get_names(
  43                 sd_bus *bus,
  44                 const char *path,
  45                 const char *interface,
  46                 const char *property,
  47                 sd_bus_message *reply,
  48                 void *userdata,
  49                 sd_bus_error *error) {
  50
  51         Unit *u = userdata;
  52         Iterator i;
  53         const char *t;
  54         int r;
  55
  56         assert(bus);
  57         assert(reply);
  58         assert(u);
  59
  60         r = sd_bus_message_open_container(reply, 'a', "s");
  61         if (r < 0)
  62                 return r;
  63
  64         SET_FOREACH(t, u->names, i) {
  65                 r = sd_bus_message_append(reply, "s", t);
  66                 if (r < 0)
  67                         return r;
  68         }
  69
  70         return sd_bus_message_close_container(reply);
  71 }
  72
  73 static int property_get_following(
  74                 sd_bus *bus,
  75                 const char *path,
  76                 const char *interface,
  77                 const char *property,
  78                 sd_bus_message *reply,
  79                 void *userdata,
  80                 sd_bus_error *error) {
  81
  82         Unit *u = userdata, *f;
  83
  84         assert(bus);
  85         assert(reply);
  86         assert(u);
  87
  88         f = unit_following(u);
  89         return sd_bus_message_append(reply, "s", f ? f->id : "");
  90 }
  91
  92 static int property_get_dependencies(
  93                 sd_bus *bus,
  94                 const char *path,
  95                 const char *interface,
  96                 const char *property,
  97                 sd_bus_message *reply,
  98                 void *userdata,
  99                 sd_bus_error *error) {
 100
 101         Set *s = *(Set**) userdata;
 102         Iterator j;
 103         Unit *u;
 104         int r;
 105
 106         assert(bus);
 107         assert(reply);
 108
 109         r = sd_bus_message_open_container(reply, 'a', "s");
 110         if (r < 0)
 111                 return r;
 112
 113         SET_FOREACH(u, s, j) {
 114                 r = sd_bus_message_append(reply, "s", u->id);
 115                 if (r < 0)
 116                         return r;
 117         }
 118
 119         return sd_bus_message_close_container(reply);
 120 }
 121
 122 static int property_get_obsolete_dependencies(
 123                 sd_bus *bus,
 124                 const char *path,
 125                 const char *interface,
 126                 const char *property,
 127                 sd_bus_message *reply,
 128                 void *userdata,
 129                 sd_bus_error *error) {
 130
 131         assert(bus);
 132         assert(reply);
 133
 134         /* For dependency types we don't support anymore always return an empty array */
 135         return sd_bus_message_append(reply, "as", 0);
 136 }
 137
 138 static int property_get_description(
 139                 sd_bus *bus,
 140                 const char *path,
 141                 const char *interface,
 142                 const char *property,
 143                 sd_bus_message *reply,
 144                 void *userdata,
 145                 sd_bus_error *error) {
 146
 147         Unit *u = userdata;
 148
 149         assert(bus);
 150         assert(reply);
 151         assert(u);
 152
 153         return sd_bus_message_append(reply, "s", unit_description(u));
 154 }
 155
 156 static int property_get_active_state(
 157                 sd_bus *bus,
 158                 const char *path,
 159                 const char *interface,
 160                 const char *property,
 161                 sd_bus_message *reply,
 162                 void *userdata,
 163                 sd_bus_error *error) {
 164
 165         Unit *u = userdata;
 166
 167         assert(bus);
 168         assert(reply);
 169         assert(u);
 170
 171         return sd_bus_message_append(reply, "s", unit_active_state_to_string(unit_active_state(u)));
 172 }
 173
 174 static int property_get_sub_state(
 175                 sd_bus *bus,
 176                 const char *path,
 177                 const char *interface,
 178                 const char *property,
 179                 sd_bus_message *reply,
 180                 void *userdata,
 181                 sd_bus_error *error) {
 182
 183         Unit *u = userdata;
 184
 185         assert(bus);
 186         assert(reply);
 187         assert(u);
 188
 189         return sd_bus_message_append(reply, "s", unit_sub_state_to_string(u));
 190 }
 191
 192 static int property_get_unit_file_preset(
 193                 sd_bus *bus,
 194                 const char *path,
 195                 const char *interface,
 196                 const char *property,
 197                 sd_bus_message *reply,
 198                 void *userdata,
 199                 sd_bus_error *error) {
 200
 201         Unit *u = userdata;
 202         int r;
 203
 204         assert(bus);
 205         assert(reply);
 206         assert(u);
 207
 208         r = unit_get_unit_file_preset(u);
 209
 210         return sd_bus_message_append(reply, "s",
 211                                      r < 0 ? "":
 212                                      r > 0 ? "enabled" : "disabled");
 213 }
 214
 215 static int property_get_unit_file_state(
 216                 sd_bus *bus,
 217                 const char *path,
 218                 const char *interface,
 219                 const char *property,
 220                 sd_bus_message *reply,
 221                 void *userdata,
 222                 sd_bus_error *error) {
 223
 224         Unit *u = userdata;
 225
 226         assert(bus);
 227         assert(reply);
 228         assert(u);
 229
 230         return sd_bus_message_append(reply, "s", unit_file_state_to_string(unit_get_unit_file_state(u)));
 231 }
 232
 233 static int property_get_can_start(
 234                 sd_bus *bus,
 235                 const char *path,
 236                 const char *interface,
 237                 const char *property,
 238                 sd_bus_message *reply,
 239                 void *userdata,
 240                 sd_bus_error *error) {
 241
 242         Unit *u = userdata;
 243
 244         assert(bus);
 245         assert(reply);
 246         assert(u);
 247
 248         return sd_bus_message_append(reply, "b", unit_can_start(u) && !u->refuse_manual_start);
 249 }
 250
 251 static int property_get_can_stop(
 252                 sd_bus *bus,
 253                 const char *path,
 254                 const char *interface,
 255                 const char *property,
 256                 sd_bus_message *reply,
 257                 void *userdata,
 258                 sd_bus_error *error) {
 259
 260         Unit *u = userdata;
 261
 262         assert(bus);
 263         assert(reply);
 264         assert(u);
 265
 266         return sd_bus_message_append(reply, "b", unit_can_stop(u) && !u->refuse_manual_stop);
 267 }
 268
 269 static int property_get_can_reload(
 270                 sd_bus *bus,
 271                 const char *path,
 272                 const char *interface,
 273                 const char *property,
 274                 sd_bus_message *reply,
 275                 void *userdata,
 276                 sd_bus_error *error) {
 277
 278         Unit *u = userdata;
 279
 280         assert(bus);
 281         assert(reply);
 282         assert(u);
 283
 284         return sd_bus_message_append(reply, "b", unit_can_reload(u));
 285 }
 286
 287 static int property_get_can_isolate(
 288                 sd_bus *bus,
 289                 const char *path,
 290                 const char *interface,
 291                 const char *property,
 292                 sd_bus_message *reply,
 293                 void *userdata,
 294                 sd_bus_error *error) {
 295
 296         Unit *u = userdata;
 297
 298         assert(bus);
 299         assert(reply);
 300         assert(u);
 301
 302         return sd_bus_message_append(reply, "b", unit_can_isolate(u) && !u->refuse_manual_start);
 303 }
 304
 305 static int property_get_job(
 306                 sd_bus *bus,
 307                 const char *path,
 308                 const char *interface,
 309                 const char *property,
 310                 sd_bus_message *reply,
 311                 void *userdata,
 312                 sd_bus_error *error) {
 313
 314         _cleanup_free_ char *p = NULL;
 315         Unit *u = userdata;
 316
 317         assert(bus);
 318         assert(reply);
 319         assert(u);
 320
 321         if (!u->job)
 322                 return sd_bus_message_append(reply, "(uo)", 0, "/");
 323
 324         p = job_dbus_path(u->job);
 325         if (!p)
 326                 return -ENOMEM;
 327
 328         return sd_bus_message_append(reply, "(uo)", u->job->id, p);
 329 }
 330
 331 static int property_get_need_daemon_reload(
 332                 sd_bus *bus,
 333                 const char *path,
 334                 const char *interface,
 335                 const char *property,
 336                 sd_bus_message *reply,
 337                 void *userdata,
 338                 sd_bus_error *error) {
 339
 340         Unit *u = userdata;
 341
 342         assert(bus);
 343         assert(reply);
 344         assert(u);
 345
 346         return sd_bus_message_append(reply, "b", unit_need_daemon_reload(u));
 347 }
 348
 349 static int property_get_conditions(
 350                 sd_bus *bus,
 351                 const char *path,
 352                 const char *interface,
 353                 const char *property,
 354                 sd_bus_message *reply,
 355                 void *userdata,
 356                 sd_bus_error *error) {
 357
 358         const char *(*to_string)(ConditionType type) = NULL;
 359         Condition **list = userdata, *c;
 360         int r;
 361
 362         assert(bus);
 363         assert(reply);
 364         assert(list);
 365
 366         to_string = streq(property, "Asserts") ? assert_type_to_string : condition_type_to_string;
 367
 368         r = sd_bus_message_open_container(reply, 'a', "(sbbsi)");
 369         if (r < 0)
 370                 return r;
 371
 372         LIST_FOREACH(conditions, c, *list) {
 373                 int tristate;
 374
 375                 tristate =
 376                         c->result == CONDITION_UNTESTED ? 0 :
 377                         c->result == CONDITION_SUCCEEDED ? 1 : -1;
 378
 379                 r = sd_bus_message_append(reply, "(sbbsi)",
 380                                           to_string(c->type),
 381                                           c->trigger, c->negate,
 382                                           c->parameter, tristate);
 383                 if (r < 0)
 384                         return r;
 385
 386         }
 387
 388         return sd_bus_message_close_container(reply);
 389 }
 390
 391 static int property_get_load_error(
 392                 sd_bus *bus,
 393                 const char *path,
 394                 const char *interface,
 395                 const char *property,
 396                 sd_bus_message *reply,
 397                 void *userdata,
 398                 sd_bus_error *error) {
 399
 400         _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
 401         Unit *u = userdata;
 402
 403         assert(bus);
 404         assert(reply);
 405         assert(u);
 406
 407         if (u->load_error != 0)
 408                 sd_bus_error_set_errno(&e, u->load_error);
 409
 410         return sd_bus_message_append(reply, "(ss)", e.name, e.message);
 411 }
 412
 413 static int bus_verify_manage_units_async_full(
 414                 Unit *u,
 415                 const char *verb,
 416                 int capability,
 417                 const char *polkit_message,
 418                 bool interactive,
 419                 sd_bus_message *call,
 420                 sd_bus_error *error) {
 421
 422         const char *details[9] = {
 423                 "unit", u->id,
 424                 "verb", verb,
 425         };
 426
 427         if (polkit_message) {
 428                 details[4] = "polkit.message";
 429                 details[5] = polkit_message;
 430                 details[6] = "polkit.gettext_domain";
 431                 details[7] = GETTEXT_PACKAGE;
 432         }
 433
 434         return bus_verify_polkit_async(
 435                         call,
 436                         capability,
 437                         "org.freedesktop.systemd1.manage-units",
 438                         details,
 439                         interactive,
 440                         UID_INVALID,
 441                         &u->manager->polkit_registry,
 442                         error);
 443 }
 444
 445 int bus_unit_method_start_generic(
 446                 sd_bus_message *message,
 447                 Unit *u,
 448                 JobType job_type,
 449                 bool reload_if_possible,
 450                 sd_bus_error *error) {
 451
 452         const char *smode;
 453         JobMode mode;
 454         _cleanup_free_ char *verb = NULL;
 455         static const char *const polkit_message_for_job[_JOB_TYPE_MAX] = {
 456                 [JOB_START]       = N_("Authentication is required to start '$(unit)'."),
 457                 [JOB_STOP]        = N_("Authentication is required to stop '$(unit)'."),
 458                 [JOB_RELOAD]      = N_("Authentication is required to reload '$(unit)'."),
 459                 [JOB_RESTART]     = N_("Authentication is required to restart '$(unit)'."),
 460                 [JOB_TRY_RESTART] = N_("Authentication is required to restart '$(unit)'."),
 461         };
 462         int r;
 463
 464         assert(message);
 465         assert(u);
 466         assert(job_type >= 0 && job_type < _JOB_TYPE_MAX);
 467
 468         r = mac_selinux_unit_access_check(
 469                         u, message,
 470                         job_type_to_access_method(job_type),
 471                         error);
 472         if (r < 0)
 473                 return r;
 474
 475         r = sd_bus_message_read(message, "s", &smode);
 476         if (r < 0)
 477                 return r;
 478
 479         mode = job_mode_from_string(smode);
 480         if (mode < 0)
 481                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s invalid", smode);
 482
 483         if (reload_if_possible)
 484                 verb = strjoin("reload-or-", job_type_to_string(job_type), NULL);
 485         else
 486                 verb = strdup(job_type_to_string(job_type));
 487         if (!verb)
 488                 return -ENOMEM;
 489
 490         r = bus_verify_manage_units_async_full(
 491                         u,
 492                         verb,
 493                         CAP_SYS_ADMIN,
 494                         job_type < _JOB_TYPE_MAX ? polkit_message_for_job[job_type] : NULL,
 495                         true,
 496                         message,
 497                         error);
 498         if (r < 0)
 499                 return r;
 500         if (r == 0)
 501                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 502
 503         return bus_unit_queue_job(message, u, job_type, mode, reload_if_possible, error);
 504 }
 505
 506 static int method_start(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 507         return bus_unit_method_start_generic(message, userdata, JOB_START, false, error);
 508 }
 509
 510 static int method_stop(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 511         return bus_unit_method_start_generic(message, userdata, JOB_STOP, false, error);
 512 }
 513
 514 static int method_reload(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 515         return bus_unit_method_start_generic(message, userdata, JOB_RELOAD, false, error);
 516 }
 517
 518 static int method_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 519         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, false, error);
 520 }
 521
 522 static int method_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 523         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, false, error);
 524 }
 525
 526 static int method_reload_or_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 527         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, true, error);
 528 }
 529
 530 static int method_reload_or_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 531         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, true, error);
 532 }
 533
 534 int bus_unit_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 535         Unit *u = userdata;
 536         const char *swho;
 537         int32_t signo;
 538         KillWho who;
 539         int r;
 540
 541         assert(message);
 542         assert(u);
 543
 544         r = mac_selinux_unit_access_check(u, message, "stop", error);
 545         if (r < 0)
 546                 return r;
 547
 548         r = sd_bus_message_read(message, "si", &swho, &signo);
 549         if (r < 0)
 550                 return r;
 551
 552         if (isempty(swho))
 553                 who = KILL_ALL;
 554         else {
 555                 who = kill_who_from_string(swho);
 556                 if (who < 0)
 557                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid who argument %s", swho);
 558         }
 559
 560         if (!SIGNAL_VALID(signo))
 561                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Signal number out of range.");
 562
 563         r = bus_verify_manage_units_async_full(
 564                         u,
 565                         "kill",
 566                         CAP_KILL,
 567                         N_("Authentication is required to kill '$(unit)'."),
 568                         true,
 569                         message,
 570                         error);
 571         if (r < 0)
 572                 return r;
 573         if (r == 0)
 574                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 575
 576         r = unit_kill(u, who, signo, error);
 577         if (r < 0)
 578                 return r;
 579
 580         return sd_bus_reply_method_return(message, NULL);
 581 }
 582
 583 int bus_unit_method_reset_failed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 584         Unit *u = userdata;
 585         int r;
 586
 587         assert(message);
 588         assert(u);
 589
 590         r = mac_selinux_unit_access_check(u, message, "reload", error);
 591         if (r < 0)
 592                 return r;
 593
 594         r = bus_verify_manage_units_async_full(
 595                         u,
 596                         "reset-failed",
 597                         CAP_SYS_ADMIN,
 598                         N_("Authentication is required to reset the \"failed\" state of '$(unit)'."),
 599                         true,
 600                         message,
 601                         error);
 602         if (r < 0)
 603                 return r;
 604         if (r == 0)
 605                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 606
 607         unit_reset_failed(u);
 608
 609         return sd_bus_reply_method_return(message, NULL);
 610 }
 611
 612 int bus_unit_method_set_properties(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 613         Unit *u = userdata;
 614         int runtime, r;
 615
 616         assert(message);
 617         assert(u);
 618
 619         r = mac_selinux_unit_access_check(u, message, "start", error);
 620         if (r < 0)
 621                 return r;
 622
 623         r = sd_bus_message_read(message, "b", &runtime);
 624         if (r < 0)
 625                 return r;
 626
 627         r = bus_verify_manage_units_async_full(
 628                         u,
 629                         "set-property",
 630                         CAP_SYS_ADMIN,
 631                         N_("Authentication is required to set properties on '$(unit)'."),
 632                         true,
 633                         message,
 634                         error);
 635         if (r < 0)
 636                 return r;
 637         if (r == 0)
 638                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 639
 640         r = bus_unit_set_properties(u, message, runtime ? UNIT_RUNTIME : UNIT_PERSISTENT, true, error);
 641         if (r < 0)
 642                 return r;
 643
 644         return sd_bus_reply_method_return(message, NULL);
 645 }
 646
 647 int bus_unit_method_ref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 648         Unit *u = userdata;
 649         int r;
 650
 651         assert(message);
 652         assert(u);
 653
 654         r = mac_selinux_unit_access_check(u, message, "start", error);
 655         if (r < 0)
 656                 return r;
 657
 658         r = bus_verify_manage_units_async_full(
 659                         u,
 660                         "ref",
 661                         CAP_SYS_ADMIN,
 662                         NULL,
 663                         false,
 664                         message,
 665                         error);
 666         if (r < 0)
 667                 return r;
 668         if (r == 0)
 669                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 670
 671         r = bus_unit_track_add_sender(u, message);
 672         if (r < 0)
 673                 return r;
 674
 675         return sd_bus_reply_method_return(message, NULL);
 676 }
 677
 678 int bus_unit_method_unref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 679         Unit *u = userdata;
 680         int r;
 681
 682         assert(message);
 683         assert(u);
 684
 685         r = bus_unit_track_remove_sender(u, message);
 686         if (r == -EUNATCH)
 687                 return sd_bus_error_setf(error, BUS_ERROR_NOT_REFERENCED, "Unit has not been referenced yet.");
 688         if (r < 0)
 689                 return r;
 690
 691         return sd_bus_reply_method_return(message, NULL);
 692 }
 693
 694 const sd_bus_vtable bus_unit_vtable[] = {
 695         SD_BUS_VTABLE_START(0),
 696
 697         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Unit, id), SD_BUS_VTABLE_PROPERTY_CONST),
 698         SD_BUS_PROPERTY("Names", "as", property_get_names, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 699         SD_BUS_PROPERTY("Following", "s", property_get_following, 0, 0),
 700         SD_BUS_PROPERTY("Requires", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES]), SD_BUS_VTABLE_PROPERTY_CONST),
 701         SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), SD_BUS_VTABLE_PROPERTY_CONST),
 702         SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 703         SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 704         SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 705         SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 706         SD_BUS_PROPERTY("RequisiteOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 707         SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 708         SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 709         SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 710         SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 711         SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 712         SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), SD_BUS_VTABLE_PROPERTY_CONST),
 713         SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), SD_BUS_VTABLE_PROPERTY_CONST),
 714         SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), SD_BUS_VTABLE_PROPERTY_CONST),
 715         SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), SD_BUS_VTABLE_PROPERTY_CONST),
 716         SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 717         SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 718         SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), SD_BUS_VTABLE_PROPERTY_CONST),
 719         SD_BUS_PROPERTY("JoinsNamespaceOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_JOINS_NAMESPACE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 720         SD_BUS_PROPERTY("RequiresMountsFor", "as", NULL, offsetof(Unit, requires_mounts_for), SD_BUS_VTABLE_PROPERTY_CONST),
 721         SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), SD_BUS_VTABLE_PROPERTY_CONST),
 722         SD_BUS_PROPERTY("Description", "s", property_get_description, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 723         SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), SD_BUS_VTABLE_PROPERTY_CONST),
 724         SD_BUS_PROPERTY("ActiveState", "s", property_get_active_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 725         SD_BUS_PROPERTY("SubState", "s", property_get_sub_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 726         SD_BUS_PROPERTY("FragmentPath", "s", NULL, offsetof(Unit, fragment_path), SD_BUS_VTABLE_PROPERTY_CONST),
 727         SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), SD_BUS_VTABLE_PROPERTY_CONST),
 728         SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), SD_BUS_VTABLE_PROPERTY_CONST),
 729         SD_BUS_PROPERTY("UnitFileState", "s", property_get_unit_file_state, 0, 0),
 730         SD_BUS_PROPERTY("UnitFilePreset", "s", property_get_unit_file_preset, 0, 0),
 731         BUS_PROPERTY_DUAL_TIMESTAMP("StateChangeTimestamp", offsetof(Unit, state_change_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 732         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveExitTimestamp", offsetof(Unit, inactive_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 733         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveEnterTimestamp", offsetof(Unit, active_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 734         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveExitTimestamp", offsetof(Unit, active_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 735         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveEnterTimestamp", offsetof(Unit, inactive_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 736         SD_BUS_PROPERTY("CanStart", "b", property_get_can_start, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 737         SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 738         SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 739         SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 740         SD_BUS_PROPERTY("Job", "(uo)", property_get_job, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 741         SD_BUS_PROPERTY("StopWhenUnneeded", "b", bus_property_get_bool, offsetof(Unit, stop_when_unneeded), SD_BUS_VTABLE_PROPERTY_CONST),
 742         SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), SD_BUS_VTABLE_PROPERTY_CONST),
 743         SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), SD_BUS_VTABLE_PROPERTY_CONST),
 744         SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 745         SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), SD_BUS_VTABLE_PROPERTY_CONST),
 746         SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), SD_BUS_VTABLE_PROPERTY_CONST),
 747         SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 748         SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 749         SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
 750         SD_BUS_PROPERTY("JobTimeoutAction", "s", property_get_emergency_action, offsetof(Unit, job_timeout_action), SD_BUS_VTABLE_PROPERTY_CONST),
 751         SD_BUS_PROPERTY("JobTimeoutRebootArgument", "s", NULL, offsetof(Unit, job_timeout_reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 752         SD_BUS_PROPERTY("ConditionResult", "b", bus_property_get_bool, offsetof(Unit, condition_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 753         SD_BUS_PROPERTY("AssertResult", "b", bus_property_get_bool, offsetof(Unit, assert_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 754         BUS_PROPERTY_DUAL_TIMESTAMP("ConditionTimestamp", offsetof(Unit, condition_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 755         BUS_PROPERTY_DUAL_TIMESTAMP("AssertTimestamp", offsetof(Unit, assert_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 756         SD_BUS_PROPERTY("Conditions", "a(sbbsi)", property_get_conditions, offsetof(Unit, conditions), 0),
 757         SD_BUS_PROPERTY("Asserts", "a(sbbsi)", property_get_conditions, offsetof(Unit, asserts), 0),
 758         SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 759         SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), SD_BUS_VTABLE_PROPERTY_CONST),
 760         SD_BUS_PROPERTY("Perpetual", "b", bus_property_get_bool, offsetof(Unit, perpetual), SD_BUS_VTABLE_PROPERTY_CONST),
 761         SD_BUS_PROPERTY("StartLimitIntervalSec", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST),
 762         SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Unit, start_limit.burst), SD_BUS_VTABLE_PROPERTY_CONST),
 763         SD_BUS_PROPERTY("StartLimitAction", "s", property_get_emergency_action, offsetof(Unit, start_limit_action), SD_BUS_VTABLE_PROPERTY_CONST),
 764         SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Unit, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 765         SD_BUS_PROPERTY("InvocationID", "ay", bus_property_get_id128, offsetof(Unit, invocation_id), 0),
 766
 767         SD_BUS_METHOD("Start", "s", "o", method_start, SD_BUS_VTABLE_UNPRIVILEGED),
 768         SD_BUS_METHOD("Stop", "s", "o", method_stop, SD_BUS_VTABLE_UNPRIVILEGED),
 769         SD_BUS_METHOD("Reload", "s", "o", method_reload, SD_BUS_VTABLE_UNPRIVILEGED),
 770         SD_BUS_METHOD("Restart", "s", "o", method_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 771         SD_BUS_METHOD("TryRestart", "s", "o", method_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 772         SD_BUS_METHOD("ReloadOrRestart", "s", "o", method_reload_or_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 773         SD_BUS_METHOD("ReloadOrTryRestart", "s", "o", method_reload_or_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 774         SD_BUS_METHOD("Kill", "si", NULL, bus_unit_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 775         SD_BUS_METHOD("ResetFailed", NULL, NULL, bus_unit_method_reset_failed, SD_BUS_VTABLE_UNPRIVILEGED),
 776         SD_BUS_METHOD("SetProperties", "ba(sv)", NULL, bus_unit_method_set_properties, SD_BUS_VTABLE_UNPRIVILEGED),
 777         SD_BUS_METHOD("Ref", NULL, NULL, bus_unit_method_ref, SD_BUS_VTABLE_UNPRIVILEGED),
 778         SD_BUS_METHOD("Unref", NULL, NULL, bus_unit_method_unref, SD_BUS_VTABLE_UNPRIVILEGED),
 779
 780         /* Obsolete properties or obsolete alias names */
 781         SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 782         SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 783         SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 784         SD_BUS_PROPERTY("RequisiteOfOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 785         SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
 786         SD_BUS_VTABLE_END
 787 };
 788
 789 static int property_get_slice(
 790                 sd_bus *bus,
 791                 const char *path,
 792                 const char *interface,
 793                 const char *property,
 794                 sd_bus_message *reply,
 795                 void *userdata,
 796                 sd_bus_error *error) {
 797
 798         Unit *u = userdata;
 799
 800         assert(bus);
 801         assert(reply);
 802         assert(u);
 803
 804         return sd_bus_message_append(reply, "s", unit_slice_name(u));
 805 }
 806
 807 static int property_get_current_memory(
 808                 sd_bus *bus,
 809                 const char *path,
 810                 const char *interface,
 811                 const char *property,
 812                 sd_bus_message *reply,
 813                 void *userdata,
 814                 sd_bus_error *error) {
 815
 816         uint64_t sz = (uint64_t) -1;
 817         Unit *u = userdata;
 818         int r;
 819
 820         assert(bus);
 821         assert(reply);
 822         assert(u);
 823
 824         r = unit_get_memory_current(u, &sz);
 825         if (r < 0 && r != -ENODATA)
 826                 log_unit_warning_errno(u, r, "Failed to get memory.usage_in_bytes attribute: %m");
 827
 828         return sd_bus_message_append(reply, "t", sz);
 829 }
 830
 831 static int property_get_current_tasks(
 832                 sd_bus *bus,
 833                 const char *path,
 834                 const char *interface,
 835                 const char *property,
 836                 sd_bus_message *reply,
 837                 void *userdata,
 838                 sd_bus_error *error) {
 839
 840         uint64_t cn = (uint64_t) -1;
 841         Unit *u = userdata;
 842         int r;
 843
 844         assert(bus);
 845         assert(reply);
 846         assert(u);
 847
 848         r = unit_get_tasks_current(u, &cn);
 849         if (r < 0 && r != -ENODATA)
 850                 log_unit_warning_errno(u, r, "Failed to get pids.current attribute: %m");
 851
 852         return sd_bus_message_append(reply, "t", cn);
 853 }
 854
 855 static int property_get_cpu_usage(
 856                 sd_bus *bus,
 857                 const char *path,
 858                 const char *interface,
 859                 const char *property,
 860                 sd_bus_message *reply,
 861                 void *userdata,
 862                 sd_bus_error *error) {
 863
 864         nsec_t ns = (nsec_t) -1;
 865         Unit *u = userdata;
 866         int r;
 867
 868         assert(bus);
 869         assert(reply);
 870         assert(u);
 871
 872         r = unit_get_cpu_usage(u, &ns);
 873         if (r < 0 && r != -ENODATA)
 874                 log_unit_warning_errno(u, r, "Failed to get cpuacct.usage attribute: %m");
 875
 876         return sd_bus_message_append(reply, "t", ns);
 877 }
 878
 879 static int property_get_cgroup(
 880                 sd_bus *bus,
 881                 const char *path,
 882                 const char *interface,
 883                 const char *property,
 884                 sd_bus_message *reply,
 885                 void *userdata,
 886                 sd_bus_error *error) {
 887
 888         Unit *u = userdata;
 889         const char *t;
 890
 891         assert(bus);
 892         assert(reply);
 893         assert(u);
 894
 895         /* Three cases: a) u->cgroup_path is NULL, in which case the
 896          * unit has no control group, which we report as the empty
 897          * string. b) u->cgroup_path is the empty string, which
 898          * indicates the root cgroup, which we report as "/". c) all
 899          * other cases we report as-is. */
 900
 901         if (u->cgroup_path)
 902                 t = isempty(u->cgroup_path) ? "/" : u->cgroup_path;
 903         else
 904                 t = "";
 905
 906         return sd_bus_message_append(reply, "s", t);
 907 }
 908
 909 static int append_process(sd_bus_message *reply, const char *p, pid_t pid, Set *pids) {
 910         _cleanup_free_ char *buf = NULL, *cmdline = NULL;
 911         int r;
 912
 913         assert(reply);
 914         assert(pid > 0);
 915
 916         r = set_put(pids, PID_TO_PTR(pid));
 917         if (r == -EEXIST || r == 0)
 918                 return 0;
 919         if (r < 0)
 920                 return r;
 921
 922         if (!p) {
 923                 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &buf);
 924                 if (r == -ESRCH)
 925                         return 0;
 926                 if (r < 0)
 927                         return r;
 928
 929                 p = buf;
 930         }
 931
 932         (void) get_process_cmdline(pid, 0, true, &cmdline);
 933
 934         return sd_bus_message_append(reply,
 935                                      "(sus)",
 936                                      p,
 937                                      (uint32_t) pid,
 938                                      cmdline);
 939 }
 940
 941 static int append_cgroup(sd_bus_message *reply, const char *p, Set *pids) {
 942         _cleanup_closedir_ DIR *d = NULL;
 943         _cleanup_fclose_ FILE *f = NULL;
 944         int r;
 945
 946         assert(reply);
 947         assert(p);
 948
 949         r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, p, &f);
 950         if (r == ENOENT)
 951                 return 0;
 952         if (r < 0)
 953                 return r;
 954
 955         for (;;) {
 956                 pid_t pid;
 957
 958                 r = cg_read_pid(f, &pid);
 959                 if (r < 0)
 960                         return r;
 961                 if (r == 0)
 962                         break;
 963
 964                 if (is_kernel_thread(pid) > 0)
 965                         continue;
 966
 967                 r = append_process(reply, p, pid, pids);
 968                 if (r < 0)
 969                         return r;
 970         }
 971
 972         r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, p, &d);
 973         if (r == -ENOENT)
 974                 return 0;
 975         if (r < 0)
 976                 return r;
 977
 978         for (;;) {
 979                 _cleanup_free_ char *g = NULL, *j = NULL;
 980
 981                 r = cg_read_subgroup(d, &g);
 982                 if (r < 0)
 983                         return r;
 984                 if (r == 0)
 985                         break;
 986
 987                 j = strjoin(p, "/", g, NULL);
 988                 if (!j)
 989                         return -ENOMEM;
 990
 991                 r = append_cgroup(reply, j, pids);
 992                 if (r < 0)
 993                         return r;
 994         }
 995
 996         return 0;
 997 }
 998
 999 int bus_unit_method_get_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1000         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1001         _cleanup_(set_freep) Set *pids = NULL;
1002         Unit *u = userdata;
1003         pid_t pid;
1004         int r;
1005
1006         assert(message);
1007
1008         pids = set_new(NULL);
1009         if (!pids)
1010                 return -ENOMEM;
1011
1012         r = sd_bus_message_new_method_return(message, &reply);
1013         if (r < 0)
1014                 return r;
1015
1016         r = sd_bus_message_open_container(reply, 'a', "(sus)");
1017         if (r < 0)
1018                 return r;
1019
1020         if (u->cgroup_path) {
1021                 r = append_cgroup(reply, u->cgroup_path, pids);
1022                 if (r < 0)
1023                         return r;
1024         }
1025
1026         /* The main and control pids might live outside of the cgroup, hence fetch them separately */
1027         pid = unit_main_pid(u);
1028         if (pid > 0) {
1029                 r = append_process(reply, NULL, pid, pids);
1030                 if (r < 0)
1031                         return r;
1032         }
1033
1034         pid = unit_control_pid(u);
1035         if (pid > 0) {
1036                 r = append_process(reply, NULL, pid, pids);
1037                 if (r < 0)
1038                         return r;
1039         }
1040
1041         r = sd_bus_message_close_container(reply);
1042         if (r < 0)
1043                 return r;
1044
1045         return sd_bus_send(NULL, reply, NULL);
1046 }
1047
1048 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
1049         SD_BUS_VTABLE_START(0),
1050         SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
1051         SD_BUS_PROPERTY("ControlGroup", "s", property_get_cgroup, 0, 0),
1052         SD_BUS_PROPERTY("MemoryCurrent", "t", property_get_current_memory, 0, 0),
1053         SD_BUS_PROPERTY("CPUUsageNSec", "t", property_get_cpu_usage, 0, 0),
1054         SD_BUS_PROPERTY("TasksCurrent", "t", property_get_current_tasks, 0, 0),
1055         SD_BUS_METHOD("GetProcesses", NULL, "a(sus)", bus_unit_method_get_processes, SD_BUS_VTABLE_UNPRIVILEGED),
1056         SD_BUS_VTABLE_END
1057 };
1058
1059 static int send_new_signal(sd_bus *bus, void *userdata) {
1060         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1061         _cleanup_free_ char *p = NULL;
1062         Unit *u = userdata;
1063         int r;
1064
1065         assert(bus);
1066         assert(u);
1067
1068         p = unit_dbus_path(u);
1069         if (!p)
1070                 return -ENOMEM;
1071
1072         r = sd_bus_message_new_signal(
1073                         bus,
1074                         &m,
1075                         "/org/freedesktop/systemd1",
1076                         "org.freedesktop.systemd1.Manager",
1077                         "UnitNew");
1078         if (r < 0)
1079                 return r;
1080
1081         r = sd_bus_message_append(m, "so", u->id, p);
1082         if (r < 0)
1083                 return r;
1084
1085         return sd_bus_send(bus, m, NULL);
1086 }
1087
1088 static int send_changed_signal(sd_bus *bus, void *userdata) {
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         /* Send a properties changed signal. First for the specific
1101          * type, then for the generic unit. The clients may rely on
1102          * this order to get atomic behavior if needed. */
1103
1104         r = sd_bus_emit_properties_changed_strv(
1105                         bus, p,
1106                         unit_dbus_interface_from_type(u->type),
1107                         NULL);
1108         if (r < 0)
1109                 return r;
1110
1111         return sd_bus_emit_properties_changed_strv(
1112                         bus, p,
1113                         "org.freedesktop.systemd1.Unit",
1114                         NULL);
1115 }
1116
1117 void bus_unit_send_change_signal(Unit *u) {
1118         int r;
1119         assert(u);
1120
1121         if (u->in_dbus_queue) {
1122                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
1123                 u->in_dbus_queue = false;
1124         }
1125
1126         if (!u->id)
1127                 return;
1128
1129         r = bus_foreach_bus(u->manager, NULL, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
1130         if (r < 0)
1131                 log_unit_debug_errno(u, r, "Failed to send unit change signal for %s: %m", u->id);
1132
1133         u->sent_dbus_new_signal = true;
1134 }
1135
1136 static int send_removed_signal(sd_bus *bus, void *userdata) {
1137         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1138         _cleanup_free_ char *p = NULL;
1139         Unit *u = userdata;
1140         int r;
1141
1142         assert(bus);
1143         assert(u);
1144
1145         p = unit_dbus_path(u);
1146         if (!p)
1147                 return -ENOMEM;
1148
1149         r = sd_bus_message_new_signal(
1150                         bus,
1151                         &m,
1152                         "/org/freedesktop/systemd1",
1153                         "org.freedesktop.systemd1.Manager",
1154                         "UnitRemoved");
1155         if (r < 0)
1156                 return r;
1157
1158         r = sd_bus_message_append(m, "so", u->id, p);
1159         if (r < 0)
1160                 return r;
1161
1162         return sd_bus_send(bus, m, NULL);
1163 }
1164
1165 void bus_unit_send_removed_signal(Unit *u) {
1166         int r;
1167         assert(u);
1168
1169         if (!u->sent_dbus_new_signal || u->in_dbus_queue)
1170                 bus_unit_send_change_signal(u);
1171
1172         if (!u->id)
1173                 return;
1174
1175         r = bus_foreach_bus(u->manager, NULL, send_removed_signal, u);
1176         if (r < 0)
1177                 log_unit_debug_errno(u, r, "Failed to send unit remove signal for %s: %m", u->id);
1178 }
1179
1180 int bus_unit_queue_job(
1181                 sd_bus_message *message,
1182                 Unit *u,
1183                 JobType type,
1184                 JobMode mode,
1185                 bool reload_if_possible,
1186                 sd_bus_error *error) {
1187
1188         _cleanup_free_ char *path = NULL;
1189         Job *j;
1190         int r;
1191
1192         assert(message);
1193         assert(u);
1194         assert(type >= 0 && type < _JOB_TYPE_MAX);
1195         assert(mode >= 0 && mode < _JOB_MODE_MAX);
1196
1197         r = mac_selinux_unit_access_check(
1198                         u, message,
1199                         job_type_to_access_method(type),
1200                         error);
1201         if (r < 0)
1202                 return r;
1203
1204         if (reload_if_possible && unit_can_reload(u)) {
1205                 if (type == JOB_RESTART)
1206                         type = JOB_RELOAD_OR_START;
1207                 else if (type == JOB_TRY_RESTART)
1208                         type = JOB_TRY_RELOAD;
1209         }
1210
1211         if (type == JOB_STOP &&
1212             (u->load_state == UNIT_NOT_FOUND || u->load_state == UNIT_ERROR) &&
1213             unit_active_state(u) == UNIT_INACTIVE)
1214                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
1215
1216         if ((type == JOB_START && u->refuse_manual_start) ||
1217             (type == JOB_STOP && u->refuse_manual_stop) ||
1218             ((type == JOB_RESTART || type == JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)) ||
1219             (type == JOB_RELOAD_OR_START && job_type_collapse(type, u) == JOB_START && u->refuse_manual_start))
1220                 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only.", u->id);
1221
1222         r = manager_add_job(u->manager, type, u, mode, error, &j);
1223         if (r < 0)
1224                 return r;
1225
1226         if (sd_bus_message_get_bus(message) == u->manager->api_bus) {
1227                 if (!j->clients) {
1228                         r = sd_bus_track_new(sd_bus_message_get_bus(message), &j->clients, NULL, NULL);
1229                         if (r < 0)
1230                                 return r;
1231                 }
1232
1233                 r = sd_bus_track_add_sender(j->clients, message);
1234                 if (r < 0)
1235                         return r;
1236         }
1237
1238         path = job_dbus_path(j);
1239         if (!path)
1240                 return -ENOMEM;
1241
1242         return sd_bus_reply_method_return(message, "o", path);
1243 }
1244
1245 static int bus_unit_set_transient_property(
1246                 Unit *u,
1247                 const char *name,
1248                 sd_bus_message *message,
1249                 UnitSetPropertiesMode mode,
1250                 sd_bus_error *error) {
1251
1252         int r;
1253
1254         assert(u);
1255         assert(name);
1256         assert(message);
1257
1258         if (streq(name, "Description")) {
1259                 const char *d;
1260
1261                 r = sd_bus_message_read(message, "s", &d);
1262                 if (r < 0)
1263                         return r;
1264
1265                 if (mode != UNIT_CHECK) {
1266                         r = unit_set_description(u, d);
1267                         if (r < 0)
1268                                 return r;
1269
1270                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDescription=%s", d);
1271                 }
1272
1273                 return 1;
1274
1275         } else if (streq(name, "DefaultDependencies")) {
1276                 int b;
1277
1278                 r = sd_bus_message_read(message, "b", &b);
1279                 if (r < 0)
1280                         return r;
1281
1282                 if (mode != UNIT_CHECK) {
1283                         u->default_dependencies = b;
1284                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDefaultDependencies=%s", yes_no(b));
1285                 }
1286
1287                 return 1;
1288
1289         } else if (streq(name, "Slice")) {
1290                 Unit *slice;
1291                 const char *s;
1292
1293                 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1294                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "The slice property is only available for units with control groups.");
1295                 if (u->type == UNIT_SLICE)
1296                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Slice may not be set for slice units.");
1297                 if (unit_has_name(u, SPECIAL_INIT_SCOPE))
1298                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot set slice for init.scope");
1299
1300                 r = sd_bus_message_read(message, "s", &s);
1301                 if (r < 0)
1302                         return r;
1303
1304                 if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
1305                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name '%s'", s);
1306
1307                 /* Note that we do not dispatch the load queue here yet, as we don't want our own transient unit to be
1308                  * loaded while we are still setting it up. Or in other words, we use manager_load_unit_prepare()
1309                  * instead of manager_load_unit() on purpose, here. */
1310                 r = manager_load_unit_prepare(u->manager, s, NULL, error, &slice);
1311                 if (r < 0)
1312                         return r;
1313
1314                 if (slice->type != UNIT_SLICE)
1315                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit name '%s' is not a slice", s);
1316
1317                 if (mode != UNIT_CHECK) {
1318                         r = unit_set_slice(u, slice);
1319                         if (r < 0)
1320                                 return r;
1321
1322                         unit_write_drop_in_private_format(u, mode, name, "Slice=%s", s);
1323                 }
1324
1325                 return 1;
1326
1327         } else if (STR_IN_SET(name,
1328                               "Requires", "RequiresOverridable",
1329                               "Requisite", "RequisiteOverridable",
1330                               "Wants",
1331                               "BindsTo",
1332                               "Conflicts",
1333                               "Before", "After",
1334                               "OnFailure",
1335                               "PropagatesReloadTo", "ReloadPropagatedFrom",
1336                               "PartOf")) {
1337
1338                 UnitDependency d;
1339                 const char *other;
1340
1341                 if (streq(name, "RequiresOverridable"))
1342                         d = UNIT_REQUIRES; /* redirect for obsolete unit dependency type */
1343                 else if (streq(name, "RequisiteOverridable"))
1344                         d = UNIT_REQUISITE; /* same here */
1345                 else {
1346                         d = unit_dependency_from_string(name);
1347                         if (d < 0)
1348                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit dependency: %s", name);
1349                 }
1350
1351                 r = sd_bus_message_enter_container(message, 'a', "s");
1352                 if (r < 0)
1353                         return r;
1354
1355                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
1356                         if (!unit_name_is_valid(other, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
1357                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
1358
1359                         if (mode != UNIT_CHECK) {
1360                                 _cleanup_free_ char *label = NULL;
1361
1362                                 r = unit_add_dependency_by_name(u, d, other, NULL, true);
1363                                 if (r < 0)
1364                                         return r;
1365
1366                                 label = strjoin(name, "-", other, NULL);
1367                                 if (!label)
1368                                         return -ENOMEM;
1369
1370                                 unit_write_drop_in_format(u, mode, label, "[Unit]\n%s=%s", name, other);
1371                         }
1372
1373                 }
1374                 if (r < 0)
1375                         return r;
1376
1377                 r = sd_bus_message_exit_container(message);
1378                 if (r < 0)
1379                         return r;
1380
1381                 return 1;
1382
1383         } else if (streq(name, "AddRef")) {
1384
1385                 int b;
1386
1387                 /* Why is this called "AddRef" rather than just "Ref", or "Reference"? There's already a "Ref()" method
1388                  * on the Unit interface, and it's probably not a good idea to expose a property and a method on the
1389                  * same interface (well, strictly speaking AddRef isn't exposed as full property, we just read it for
1390                  * transient units, but still). And "References" and "ReferencedBy" is already used as unit reference
1391                  * dependency type, hence let's not confuse things with that.
1392                  *
1393                  * Note that we don't acually add the reference to the bus track. We do that only after the setup of
1394                  * the transient unit is complete, so that setting this property multiple times in the same transient
1395                  * unit creation call doesn't count as individual references. */
1396
1397                 r = sd_bus_message_read(message, "b", &b);
1398                 if (r < 0)
1399                         return r;
1400
1401                 if (mode != UNIT_CHECK)
1402                         u->bus_track_add = b;
1403
1404                 return 1;
1405         }
1406
1407         return 0;
1408 }
1409
1410 int bus_unit_set_properties(
1411                 Unit *u,
1412                 sd_bus_message *message,
1413                 UnitSetPropertiesMode mode,
1414                 bool commit,
1415                 sd_bus_error *error) {
1416
1417         bool for_real = false;
1418         unsigned n = 0;
1419         int r;
1420
1421         assert(u);
1422         assert(message);
1423
1424         /* We iterate through the array twice. First run we just check
1425          * if all passed data is valid, second run actually applies
1426          * it. This is to implement transaction-like behaviour without
1427          * actually providing full transactions. */
1428
1429         r = sd_bus_message_enter_container(message, 'a', "(sv)");
1430         if (r < 0)
1431                 return r;
1432
1433         for (;;) {
1434                 const char *name;
1435
1436                 r = sd_bus_message_enter_container(message, 'r', "sv");
1437                 if (r < 0)
1438                         return r;
1439                 if (r == 0) {
1440                         if (for_real || mode == UNIT_CHECK)
1441                                 break;
1442
1443                         /* Reached EOF. Let's try again, and this time for realz... */
1444                         r = sd_bus_message_rewind(message, false);
1445                         if (r < 0)
1446                                 return r;
1447
1448                         for_real = true;
1449                         continue;
1450                 }
1451
1452                 r = sd_bus_message_read(message, "s", &name);
1453                 if (r < 0)
1454                         return r;
1455
1456                 if (!UNIT_VTABLE(u)->bus_set_property)
1457                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
1458
1459                 r = sd_bus_message_enter_container(message, 'v', NULL);
1460                 if (r < 0)
1461                         return r;
1462
1463                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
1464                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
1465                         r = bus_unit_set_transient_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
1466                 if (r < 0)
1467                         return r;
1468                 if (r == 0)
1469                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
1470
1471                 r = sd_bus_message_exit_container(message);
1472                 if (r < 0)
1473                         return r;
1474
1475                 r = sd_bus_message_exit_container(message);
1476                 if (r < 0)
1477                         return r;
1478
1479                 n += for_real;
1480         }
1481
1482         r = sd_bus_message_exit_container(message);
1483         if (r < 0)
1484                 return r;
1485
1486         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
1487                 UNIT_VTABLE(u)->bus_commit_properties(u);
1488
1489         return n;
1490 }
1491
1492 int bus_unit_check_load_state(Unit *u, sd_bus_error *error) {
1493         assert(u);
1494
1495         if (u->load_state == UNIT_LOADED)
1496                 return 0;
1497
1498         /* Give a better description of the unit error when
1499          * possible. Note that in the case of UNIT_MASKED, load_error
1500          * is not set. */
1501         if (u->load_state == UNIT_MASKED)
1502                 return sd_bus_error_setf(error, BUS_ERROR_UNIT_MASKED, "Unit %s is masked.", u->id);
1503
1504         if (u->load_state == UNIT_NOT_FOUND)
1505                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not found.", u->id);
1506
1507         return sd_bus_error_set_errnof(error, u->load_error, "Unit %s is not loaded properly: %m.", u->id);
1508 }
1509
1510 static int bus_track_handler(sd_bus_track *t, void *userdata) {
1511         Unit *u = userdata;
1512
1513         assert(t);
1514         assert(u);
1515
1516         u->bus_track = sd_bus_track_unref(u->bus_track); /* make sure we aren't called again */
1517
1518         unit_add_to_gc_queue(u);
1519         return 0;
1520 }
1521
1522 static int allocate_bus_track(Unit *u) {
1523         int r;
1524
1525         assert(u);
1526
1527         if (u->bus_track)
1528                 return 0;
1529
1530         r = sd_bus_track_new(u->manager->api_bus, &u->bus_track, bus_track_handler, u);
1531         if (r < 0)
1532                 return r;
1533
1534         r = sd_bus_track_set_recursive(u->bus_track, true);
1535         if (r < 0) {
1536                 u->bus_track = sd_bus_track_unref(u->bus_track);
1537                 return r;
1538         }
1539
1540         return 0;
1541 }
1542
1543 int bus_unit_track_add_name(Unit *u, const char *name) {
1544         int r;
1545
1546         assert(u);
1547
1548         r = allocate_bus_track(u);
1549         if (r < 0)
1550                 return r;
1551
1552         return sd_bus_track_add_name(u->bus_track, name);
1553 }
1554
1555 int bus_unit_track_add_sender(Unit *u, sd_bus_message *m) {
1556         int r;
1557
1558         assert(u);
1559
1560         r = allocate_bus_track(u);
1561         if (r < 0)
1562                 return r;
1563
1564         return sd_bus_track_add_sender(u->bus_track, m);
1565 }
1566
1567 int bus_unit_track_remove_sender(Unit *u, sd_bus_message *m) {
1568         assert(u);
1569
1570         /* If we haven't allocated the bus track object yet, then there's definitely no reference taken yet, return an
1571          * error */
1572         if (!u->bus_track)
1573                 return -EUNATCH;
1574
1575         return sd_bus_track_remove_sender(u->bus_track, m);
1576 }