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         /* On the lower levels we assume that every unit we can start
 267          * we can also stop */
 268
 269         return sd_bus_message_append(reply, "b", unit_can_start(u) && !u->refuse_manual_stop);
 270 }
 271
 272 static int property_get_can_reload(
 273                 sd_bus *bus,
 274                 const char *path,
 275                 const char *interface,
 276                 const char *property,
 277                 sd_bus_message *reply,
 278                 void *userdata,
 279                 sd_bus_error *error) {
 280
 281         Unit *u = userdata;
 282
 283         assert(bus);
 284         assert(reply);
 285         assert(u);
 286
 287         return sd_bus_message_append(reply, "b", unit_can_reload(u));
 288 }
 289
 290 static int property_get_can_isolate(
 291                 sd_bus *bus,
 292                 const char *path,
 293                 const char *interface,
 294                 const char *property,
 295                 sd_bus_message *reply,
 296                 void *userdata,
 297                 sd_bus_error *error) {
 298
 299         Unit *u = userdata;
 300
 301         assert(bus);
 302         assert(reply);
 303         assert(u);
 304
 305         return sd_bus_message_append(reply, "b", unit_can_isolate(u) && !u->refuse_manual_start);
 306 }
 307
 308 static int property_get_job(
 309                 sd_bus *bus,
 310                 const char *path,
 311                 const char *interface,
 312                 const char *property,
 313                 sd_bus_message *reply,
 314                 void *userdata,
 315                 sd_bus_error *error) {
 316
 317         _cleanup_free_ char *p = NULL;
 318         Unit *u = userdata;
 319
 320         assert(bus);
 321         assert(reply);
 322         assert(u);
 323
 324         if (!u->job)
 325                 return sd_bus_message_append(reply, "(uo)", 0, "/");
 326
 327         p = job_dbus_path(u->job);
 328         if (!p)
 329                 return -ENOMEM;
 330
 331         return sd_bus_message_append(reply, "(uo)", u->job->id, p);
 332 }
 333
 334 static int property_get_need_daemon_reload(
 335                 sd_bus *bus,
 336                 const char *path,
 337                 const char *interface,
 338                 const char *property,
 339                 sd_bus_message *reply,
 340                 void *userdata,
 341                 sd_bus_error *error) {
 342
 343         Unit *u = userdata;
 344
 345         assert(bus);
 346         assert(reply);
 347         assert(u);
 348
 349         return sd_bus_message_append(reply, "b", unit_need_daemon_reload(u));
 350 }
 351
 352 static int property_get_conditions(
 353                 sd_bus *bus,
 354                 const char *path,
 355                 const char *interface,
 356                 const char *property,
 357                 sd_bus_message *reply,
 358                 void *userdata,
 359                 sd_bus_error *error) {
 360
 361         const char *(*to_string)(ConditionType type) = NULL;
 362         Condition **list = userdata, *c;
 363         int r;
 364
 365         assert(bus);
 366         assert(reply);
 367         assert(list);
 368
 369         to_string = streq(property, "Asserts") ? assert_type_to_string : condition_type_to_string;
 370
 371         r = sd_bus_message_open_container(reply, 'a', "(sbbsi)");
 372         if (r < 0)
 373                 return r;
 374
 375         LIST_FOREACH(conditions, c, *list) {
 376                 int tristate;
 377
 378                 tristate =
 379                         c->result == CONDITION_UNTESTED ? 0 :
 380                         c->result == CONDITION_SUCCEEDED ? 1 : -1;
 381
 382                 r = sd_bus_message_append(reply, "(sbbsi)",
 383                                           to_string(c->type),
 384                                           c->trigger, c->negate,
 385                                           c->parameter, tristate);
 386                 if (r < 0)
 387                         return r;
 388
 389         }
 390
 391         return sd_bus_message_close_container(reply);
 392 }
 393
 394 static int property_get_load_error(
 395                 sd_bus *bus,
 396                 const char *path,
 397                 const char *interface,
 398                 const char *property,
 399                 sd_bus_message *reply,
 400                 void *userdata,
 401                 sd_bus_error *error) {
 402
 403         _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
 404         Unit *u = userdata;
 405
 406         assert(bus);
 407         assert(reply);
 408         assert(u);
 409
 410         if (u->load_error != 0)
 411                 sd_bus_error_set_errno(&e, u->load_error);
 412
 413         return sd_bus_message_append(reply, "(ss)", e.name, e.message);
 414 }
 415
 416 static int bus_verify_manage_units_async_full(
 417                 Unit *u,
 418                 const char *verb,
 419                 int capability,
 420                 const char *polkit_message,
 421                 bool interactive,
 422                 sd_bus_message *call,
 423                 sd_bus_error *error) {
 424
 425         const char *details[9] = {
 426                 "unit", u->id,
 427                 "verb", verb,
 428         };
 429
 430         if (polkit_message) {
 431                 details[4] = "polkit.message";
 432                 details[5] = polkit_message;
 433                 details[6] = "polkit.gettext_domain";
 434                 details[7] = GETTEXT_PACKAGE;
 435         }
 436
 437         return bus_verify_polkit_async(
 438                         call,
 439                         capability,
 440                         "org.freedesktop.systemd1.manage-units",
 441                         details,
 442                         interactive,
 443                         UID_INVALID,
 444                         &u->manager->polkit_registry,
 445                         error);
 446 }
 447
 448 int bus_unit_method_start_generic(
 449                 sd_bus_message *message,
 450                 Unit *u,
 451                 JobType job_type,
 452                 bool reload_if_possible,
 453                 sd_bus_error *error) {
 454
 455         const char *smode;
 456         JobMode mode;
 457         _cleanup_free_ char *verb = NULL;
 458         static const char *const polkit_message_for_job[_JOB_TYPE_MAX] = {
 459                 [JOB_START]       = N_("Authentication is required to start '$(unit)'."),
 460                 [JOB_STOP]        = N_("Authentication is required to stop '$(unit)'."),
 461                 [JOB_RELOAD]      = N_("Authentication is required to reload '$(unit)'."),
 462                 [JOB_RESTART]     = N_("Authentication is required to restart '$(unit)'."),
 463                 [JOB_TRY_RESTART] = N_("Authentication is required to restart '$(unit)'."),
 464         };
 465         int r;
 466
 467         assert(message);
 468         assert(u);
 469         assert(job_type >= 0 && job_type < _JOB_TYPE_MAX);
 470
 471         r = mac_selinux_unit_access_check(
 472                         u, message,
 473                         job_type_to_access_method(job_type),
 474                         error);
 475         if (r < 0)
 476                 return r;
 477
 478         r = sd_bus_message_read(message, "s", &smode);
 479         if (r < 0)
 480                 return r;
 481
 482         mode = job_mode_from_string(smode);
 483         if (mode < 0)
 484                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s invalid", smode);
 485
 486         if (reload_if_possible)
 487                 verb = strjoin("reload-or-", job_type_to_string(job_type), NULL);
 488         else
 489                 verb = strdup(job_type_to_string(job_type));
 490         if (!verb)
 491                 return -ENOMEM;
 492
 493         r = bus_verify_manage_units_async_full(
 494                         u,
 495                         verb,
 496                         CAP_SYS_ADMIN,
 497                         job_type < _JOB_TYPE_MAX ? polkit_message_for_job[job_type] : NULL,
 498                         true,
 499                         message,
 500                         error);
 501         if (r < 0)
 502                 return r;
 503         if (r == 0)
 504                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 505
 506         return bus_unit_queue_job(message, u, job_type, mode, reload_if_possible, error);
 507 }
 508
 509 static int method_start(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 510         return bus_unit_method_start_generic(message, userdata, JOB_START, false, error);
 511 }
 512
 513 static int method_stop(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 514         return bus_unit_method_start_generic(message, userdata, JOB_STOP, false, error);
 515 }
 516
 517 static int method_reload(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 518         return bus_unit_method_start_generic(message, userdata, JOB_RELOAD, false, error);
 519 }
 520
 521 static int method_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 522         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, false, error);
 523 }
 524
 525 static int method_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 526         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, false, error);
 527 }
 528
 529 static int method_reload_or_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 530         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, true, error);
 531 }
 532
 533 static int method_reload_or_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 534         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, true, error);
 535 }
 536
 537 int bus_unit_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 538         Unit *u = userdata;
 539         const char *swho;
 540         int32_t signo;
 541         KillWho who;
 542         int r;
 543
 544         assert(message);
 545         assert(u);
 546
 547         r = mac_selinux_unit_access_check(u, message, "stop", error);
 548         if (r < 0)
 549                 return r;
 550
 551         r = sd_bus_message_read(message, "si", &swho, &signo);
 552         if (r < 0)
 553                 return r;
 554
 555         if (isempty(swho))
 556                 who = KILL_ALL;
 557         else {
 558                 who = kill_who_from_string(swho);
 559                 if (who < 0)
 560                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid who argument %s", swho);
 561         }
 562
 563         if (!SIGNAL_VALID(signo))
 564                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Signal number out of range.");
 565
 566         r = bus_verify_manage_units_async_full(
 567                         u,
 568                         "kill",
 569                         CAP_KILL,
 570                         N_("Authentication is required to kill '$(unit)'."),
 571                         true,
 572                         message,
 573                         error);
 574         if (r < 0)
 575                 return r;
 576         if (r == 0)
 577                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 578
 579         r = unit_kill(u, who, signo, error);
 580         if (r < 0)
 581                 return r;
 582
 583         return sd_bus_reply_method_return(message, NULL);
 584 }
 585
 586 int bus_unit_method_reset_failed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 587         Unit *u = userdata;
 588         int r;
 589
 590         assert(message);
 591         assert(u);
 592
 593         r = mac_selinux_unit_access_check(u, message, "reload", error);
 594         if (r < 0)
 595                 return r;
 596
 597         r = bus_verify_manage_units_async_full(
 598                         u,
 599                         "reset-failed",
 600                         CAP_SYS_ADMIN,
 601                         N_("Authentication is required to reset the \"failed\" state of '$(unit)'."),
 602                         true,
 603                         message,
 604                         error);
 605         if (r < 0)
 606                 return r;
 607         if (r == 0)
 608                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 609
 610         unit_reset_failed(u);
 611
 612         return sd_bus_reply_method_return(message, NULL);
 613 }
 614
 615 int bus_unit_method_set_properties(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 616         Unit *u = userdata;
 617         int runtime, r;
 618
 619         assert(message);
 620         assert(u);
 621
 622         r = mac_selinux_unit_access_check(u, message, "start", error);
 623         if (r < 0)
 624                 return r;
 625
 626         r = sd_bus_message_read(message, "b", &runtime);
 627         if (r < 0)
 628                 return r;
 629
 630         r = bus_verify_manage_units_async_full(
 631                         u,
 632                         "set-property",
 633                         CAP_SYS_ADMIN,
 634                         N_("Authentication is required to set properties on '$(unit)'."),
 635                         true,
 636                         message,
 637                         error);
 638         if (r < 0)
 639                 return r;
 640         if (r == 0)
 641                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 642
 643         r = bus_unit_set_properties(u, message, runtime ? UNIT_RUNTIME : UNIT_PERSISTENT, true, error);
 644         if (r < 0)
 645                 return r;
 646
 647         return sd_bus_reply_method_return(message, NULL);
 648 }
 649
 650 int bus_unit_method_ref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 651         Unit *u = userdata;
 652         int r;
 653
 654         assert(message);
 655         assert(u);
 656
 657         r = mac_selinux_unit_access_check(u, message, "start", error);
 658         if (r < 0)
 659                 return r;
 660
 661         r = bus_verify_manage_units_async_full(
 662                         u,
 663                         "ref",
 664                         CAP_SYS_ADMIN,
 665                         NULL,
 666                         false,
 667                         message,
 668                         error);
 669         if (r < 0)
 670                 return r;
 671         if (r == 0)
 672                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 673
 674         r = bus_unit_track_add_sender(u, message);
 675         if (r < 0)
 676                 return r;
 677
 678         return sd_bus_reply_method_return(message, NULL);
 679 }
 680
 681 int bus_unit_method_unref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 682         Unit *u = userdata;
 683         int r;
 684
 685         assert(message);
 686         assert(u);
 687
 688         r = bus_unit_track_remove_sender(u, message);
 689         if (r == -EUNATCH)
 690                 return sd_bus_error_setf(error, BUS_ERROR_NOT_REFERENCED, "Unit has not been referenced yet.");
 691         if (r < 0)
 692                 return r;
 693
 694         return sd_bus_reply_method_return(message, NULL);
 695 }
 696
 697 const sd_bus_vtable bus_unit_vtable[] = {
 698         SD_BUS_VTABLE_START(0),
 699
 700         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Unit, id), SD_BUS_VTABLE_PROPERTY_CONST),
 701         SD_BUS_PROPERTY("Names", "as", property_get_names, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 702         SD_BUS_PROPERTY("Following", "s", property_get_following, 0, 0),
 703         SD_BUS_PROPERTY("Requires", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES]), SD_BUS_VTABLE_PROPERTY_CONST),
 704         SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), SD_BUS_VTABLE_PROPERTY_CONST),
 705         SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 706         SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 707         SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 708         SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 709         SD_BUS_PROPERTY("RequisiteOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 710         SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 711         SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 712         SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 713         SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 714         SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 715         SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), SD_BUS_VTABLE_PROPERTY_CONST),
 716         SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), SD_BUS_VTABLE_PROPERTY_CONST),
 717         SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), SD_BUS_VTABLE_PROPERTY_CONST),
 718         SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), SD_BUS_VTABLE_PROPERTY_CONST),
 719         SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 720         SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 721         SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), SD_BUS_VTABLE_PROPERTY_CONST),
 722         SD_BUS_PROPERTY("JoinsNamespaceOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_JOINS_NAMESPACE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 723         SD_BUS_PROPERTY("RequiresMountsFor", "as", NULL, offsetof(Unit, requires_mounts_for), SD_BUS_VTABLE_PROPERTY_CONST),
 724         SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), SD_BUS_VTABLE_PROPERTY_CONST),
 725         SD_BUS_PROPERTY("Description", "s", property_get_description, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 726         SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), SD_BUS_VTABLE_PROPERTY_CONST),
 727         SD_BUS_PROPERTY("ActiveState", "s", property_get_active_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 728         SD_BUS_PROPERTY("SubState", "s", property_get_sub_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 729         SD_BUS_PROPERTY("FragmentPath", "s", NULL, offsetof(Unit, fragment_path), SD_BUS_VTABLE_PROPERTY_CONST),
 730         SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), SD_BUS_VTABLE_PROPERTY_CONST),
 731         SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), SD_BUS_VTABLE_PROPERTY_CONST),
 732         SD_BUS_PROPERTY("UnitFileState", "s", property_get_unit_file_state, 0, 0),
 733         SD_BUS_PROPERTY("UnitFilePreset", "s", property_get_unit_file_preset, 0, 0),
 734         BUS_PROPERTY_DUAL_TIMESTAMP("StateChangeTimestamp", offsetof(Unit, state_change_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 735         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveExitTimestamp", offsetof(Unit, inactive_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 736         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveEnterTimestamp", offsetof(Unit, active_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 737         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveExitTimestamp", offsetof(Unit, active_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 738         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveEnterTimestamp", offsetof(Unit, inactive_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 739         SD_BUS_PROPERTY("CanStart", "b", property_get_can_start, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 740         SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 741         SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 742         SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 743         SD_BUS_PROPERTY("Job", "(uo)", property_get_job, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 744         SD_BUS_PROPERTY("StopWhenUnneeded", "b", bus_property_get_bool, offsetof(Unit, stop_when_unneeded), SD_BUS_VTABLE_PROPERTY_CONST),
 745         SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), SD_BUS_VTABLE_PROPERTY_CONST),
 746         SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), SD_BUS_VTABLE_PROPERTY_CONST),
 747         SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 748         SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), SD_BUS_VTABLE_PROPERTY_CONST),
 749         SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), SD_BUS_VTABLE_PROPERTY_CONST),
 750         SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 751         SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 752         SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
 753         SD_BUS_PROPERTY("JobTimeoutAction", "s", property_get_emergency_action, offsetof(Unit, job_timeout_action), SD_BUS_VTABLE_PROPERTY_CONST),
 754         SD_BUS_PROPERTY("JobTimeoutRebootArgument", "s", NULL, offsetof(Unit, job_timeout_reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 755         SD_BUS_PROPERTY("ConditionResult", "b", bus_property_get_bool, offsetof(Unit, condition_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 756         SD_BUS_PROPERTY("AssertResult", "b", bus_property_get_bool, offsetof(Unit, assert_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 757         BUS_PROPERTY_DUAL_TIMESTAMP("ConditionTimestamp", offsetof(Unit, condition_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 758         BUS_PROPERTY_DUAL_TIMESTAMP("AssertTimestamp", offsetof(Unit, assert_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 759         SD_BUS_PROPERTY("Conditions", "a(sbbsi)", property_get_conditions, offsetof(Unit, conditions), 0),
 760         SD_BUS_PROPERTY("Asserts", "a(sbbsi)", property_get_conditions, offsetof(Unit, asserts), 0),
 761         SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 762         SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), SD_BUS_VTABLE_PROPERTY_CONST),
 763         SD_BUS_PROPERTY("StartLimitIntervalSec", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST),
 764         SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Unit, start_limit.burst), SD_BUS_VTABLE_PROPERTY_CONST),
 765         SD_BUS_PROPERTY("StartLimitAction", "s", property_get_emergency_action, offsetof(Unit, start_limit_action), SD_BUS_VTABLE_PROPERTY_CONST),
 766         SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Unit, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 767         SD_BUS_PROPERTY("InvocationID", "ay", bus_property_get_id128, offsetof(Unit, invocation_id), 0),
 768
 769         SD_BUS_METHOD("Start", "s", "o", method_start, SD_BUS_VTABLE_UNPRIVILEGED),
 770         SD_BUS_METHOD("Stop", "s", "o", method_stop, SD_BUS_VTABLE_UNPRIVILEGED),
 771         SD_BUS_METHOD("Reload", "s", "o", method_reload, SD_BUS_VTABLE_UNPRIVILEGED),
 772         SD_BUS_METHOD("Restart", "s", "o", method_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 773         SD_BUS_METHOD("TryRestart", "s", "o", method_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 774         SD_BUS_METHOD("ReloadOrRestart", "s", "o", method_reload_or_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 775         SD_BUS_METHOD("ReloadOrTryRestart", "s", "o", method_reload_or_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 776         SD_BUS_METHOD("Kill", "si", NULL, bus_unit_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 777         SD_BUS_METHOD("ResetFailed", NULL, NULL, bus_unit_method_reset_failed, SD_BUS_VTABLE_UNPRIVILEGED),
 778         SD_BUS_METHOD("SetProperties", "ba(sv)", NULL, bus_unit_method_set_properties, SD_BUS_VTABLE_UNPRIVILEGED),
 779         SD_BUS_METHOD("Ref", NULL, NULL, bus_unit_method_ref, SD_BUS_VTABLE_UNPRIVILEGED),
 780         SD_BUS_METHOD("Unref", NULL, NULL, bus_unit_method_unref, SD_BUS_VTABLE_UNPRIVILEGED),
 781
 782         /* Obsolete properties or obsolete alias names */
 783         SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 784         SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 785         SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 786         SD_BUS_PROPERTY("RequisiteOfOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 787         SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
 788         SD_BUS_VTABLE_END
 789 };
 790
 791 static int property_get_slice(
 792                 sd_bus *bus,
 793                 const char *path,
 794                 const char *interface,
 795                 const char *property,
 796                 sd_bus_message *reply,
 797                 void *userdata,
 798                 sd_bus_error *error) {
 799
 800         Unit *u = userdata;
 801
 802         assert(bus);
 803         assert(reply);
 804         assert(u);
 805
 806         return sd_bus_message_append(reply, "s", unit_slice_name(u));
 807 }
 808
 809 static int property_get_current_memory(
 810                 sd_bus *bus,
 811                 const char *path,
 812                 const char *interface,
 813                 const char *property,
 814                 sd_bus_message *reply,
 815                 void *userdata,
 816                 sd_bus_error *error) {
 817
 818         uint64_t sz = (uint64_t) -1;
 819         Unit *u = userdata;
 820         int r;
 821
 822         assert(bus);
 823         assert(reply);
 824         assert(u);
 825
 826         r = unit_get_memory_current(u, &sz);
 827         if (r < 0 && r != -ENODATA)
 828                 log_unit_warning_errno(u, r, "Failed to get memory.usage_in_bytes attribute: %m");
 829
 830         return sd_bus_message_append(reply, "t", sz);
 831 }
 832
 833 static int property_get_current_tasks(
 834                 sd_bus *bus,
 835                 const char *path,
 836                 const char *interface,
 837                 const char *property,
 838                 sd_bus_message *reply,
 839                 void *userdata,
 840                 sd_bus_error *error) {
 841
 842         uint64_t cn = (uint64_t) -1;
 843         Unit *u = userdata;
 844         int r;
 845
 846         assert(bus);
 847         assert(reply);
 848         assert(u);
 849
 850         r = unit_get_tasks_current(u, &cn);
 851         if (r < 0 && r != -ENODATA)
 852                 log_unit_warning_errno(u, r, "Failed to get pids.current attribute: %m");
 853
 854         return sd_bus_message_append(reply, "t", cn);
 855 }
 856
 857 static int property_get_cpu_usage(
 858                 sd_bus *bus,
 859                 const char *path,
 860                 const char *interface,
 861                 const char *property,
 862                 sd_bus_message *reply,
 863                 void *userdata,
 864                 sd_bus_error *error) {
 865
 866         nsec_t ns = (nsec_t) -1;
 867         Unit *u = userdata;
 868         int r;
 869
 870         assert(bus);
 871         assert(reply);
 872         assert(u);
 873
 874         r = unit_get_cpu_usage(u, &ns);
 875         if (r < 0 && r != -ENODATA)
 876                 log_unit_warning_errno(u, r, "Failed to get cpuacct.usage attribute: %m");
 877
 878         return sd_bus_message_append(reply, "t", ns);
 879 }
 880
 881 static int property_get_cgroup(
 882                 sd_bus *bus,
 883                 const char *path,
 884                 const char *interface,
 885                 const char *property,
 886                 sd_bus_message *reply,
 887                 void *userdata,
 888                 sd_bus_error *error) {
 889
 890         Unit *u = userdata;
 891         const char *t;
 892
 893         assert(bus);
 894         assert(reply);
 895         assert(u);
 896
 897         /* Three cases: a) u->cgroup_path is NULL, in which case the
 898          * unit has no control group, which we report as the empty
 899          * string. b) u->cgroup_path is the empty string, which
 900          * indicates the root cgroup, which we report as "/". c) all
 901          * other cases we report as-is. */
 902
 903         if (u->cgroup_path)
 904                 t = isempty(u->cgroup_path) ? "/" : u->cgroup_path;
 905         else
 906                 t = "";
 907
 908         return sd_bus_message_append(reply, "s", t);
 909 }
 910
 911 static int append_process(sd_bus_message *reply, const char *p, pid_t pid, Set *pids) {
 912         _cleanup_free_ char *buf = NULL, *cmdline = NULL;
 913         int r;
 914
 915         assert(reply);
 916         assert(pid > 0);
 917
 918         r = set_put(pids, PID_TO_PTR(pid));
 919         if (r == -EEXIST || r == 0)
 920                 return 0;
 921         if (r < 0)
 922                 return r;
 923
 924         if (!p) {
 925                 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &buf);
 926                 if (r == -ESRCH)
 927                         return 0;
 928                 if (r < 0)
 929                         return r;
 930
 931                 p = buf;
 932         }
 933
 934         (void) get_process_cmdline(pid, 0, true, &cmdline);
 935
 936         return sd_bus_message_append(reply,
 937                                      "(sus)",
 938                                      p,
 939                                      (uint32_t) pid,
 940                                      cmdline);
 941 }
 942
 943 static int append_cgroup(sd_bus_message *reply, const char *p, Set *pids) {
 944         _cleanup_closedir_ DIR *d = NULL;
 945         _cleanup_fclose_ FILE *f = NULL;
 946         int r;
 947
 948         assert(reply);
 949         assert(p);
 950
 951         r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, p, &f);
 952         if (r == ENOENT)
 953                 return 0;
 954         if (r < 0)
 955                 return r;
 956
 957         for (;;) {
 958                 pid_t pid;
 959
 960                 r = cg_read_pid(f, &pid);
 961                 if (r < 0)
 962                         return r;
 963                 if (r == 0)
 964                         break;
 965
 966                 if (is_kernel_thread(pid) > 0)
 967                         continue;
 968
 969                 r = append_process(reply, p, pid, pids);
 970                 if (r < 0)
 971                         return r;
 972         }
 973
 974         r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, p, &d);
 975         if (r == -ENOENT)
 976                 return 0;
 977         if (r < 0)
 978                 return r;
 979
 980         for (;;) {
 981                 _cleanup_free_ char *g = NULL, *j = NULL;
 982
 983                 r = cg_read_subgroup(d, &g);
 984                 if (r < 0)
 985                         return r;
 986                 if (r == 0)
 987                         break;
 988
 989                 j = strjoin(p, "/", g, NULL);
 990                 if (!j)
 991                         return -ENOMEM;
 992
 993                 r = append_cgroup(reply, j, pids);
 994                 if (r < 0)
 995                         return r;
 996         }
 997
 998         return 0;
 999 }
1000
1001 int bus_unit_method_get_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1002         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1003         _cleanup_(set_freep) Set *pids = NULL;
1004         Unit *u = userdata;
1005         pid_t pid;
1006         int r;
1007
1008         assert(message);
1009
1010         pids = set_new(NULL);
1011         if (!pids)
1012                 return -ENOMEM;
1013
1014         r = sd_bus_message_new_method_return(message, &reply);
1015         if (r < 0)
1016                 return r;
1017
1018         r = sd_bus_message_open_container(reply, 'a', "(sus)");
1019         if (r < 0)
1020                 return r;
1021
1022         if (u->cgroup_path) {
1023                 r = append_cgroup(reply, u->cgroup_path, pids);
1024                 if (r < 0)
1025                         return r;
1026         }
1027
1028         /* The main and control pids might live outside of the cgroup, hence fetch them separately */
1029         pid = unit_main_pid(u);
1030         if (pid > 0) {
1031                 r = append_process(reply, NULL, pid, pids);
1032                 if (r < 0)
1033                         return r;
1034         }
1035
1036         pid = unit_control_pid(u);
1037         if (pid > 0) {
1038                 r = append_process(reply, NULL, pid, pids);
1039                 if (r < 0)
1040                         return r;
1041         }
1042
1043         r = sd_bus_message_close_container(reply);
1044         if (r < 0)
1045                 return r;
1046
1047         return sd_bus_send(NULL, reply, NULL);
1048 }
1049
1050 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
1051         SD_BUS_VTABLE_START(0),
1052         SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
1053         SD_BUS_PROPERTY("ControlGroup", "s", property_get_cgroup, 0, 0),
1054         SD_BUS_PROPERTY("MemoryCurrent", "t", property_get_current_memory, 0, 0),
1055         SD_BUS_PROPERTY("CPUUsageNSec", "t", property_get_cpu_usage, 0, 0),
1056         SD_BUS_PROPERTY("TasksCurrent", "t", property_get_current_tasks, 0, 0),
1057         SD_BUS_METHOD("GetProcesses", NULL, "a(sus)", bus_unit_method_get_processes, SD_BUS_VTABLE_UNPRIVILEGED),
1058         SD_BUS_VTABLE_END
1059 };
1060
1061 static int send_new_signal(sd_bus *bus, void *userdata) {
1062         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1063         _cleanup_free_ char *p = NULL;
1064         Unit *u = userdata;
1065         int r;
1066
1067         assert(bus);
1068         assert(u);
1069
1070         p = unit_dbus_path(u);
1071         if (!p)
1072                 return -ENOMEM;
1073
1074         r = sd_bus_message_new_signal(
1075                         bus,
1076                         &m,
1077                         "/org/freedesktop/systemd1",
1078                         "org.freedesktop.systemd1.Manager",
1079                         "UnitNew");
1080         if (r < 0)
1081                 return r;
1082
1083         r = sd_bus_message_append(m, "so", u->id, p);
1084         if (r < 0)
1085                 return r;
1086
1087         return sd_bus_send(bus, m, NULL);
1088 }
1089
1090 static int send_changed_signal(sd_bus *bus, void *userdata) {
1091         _cleanup_free_ char *p = NULL;
1092         Unit *u = userdata;
1093         int r;
1094
1095         assert(bus);
1096         assert(u);
1097
1098         p = unit_dbus_path(u);
1099         if (!p)
1100                 return -ENOMEM;
1101
1102         /* Send a properties changed signal. First for the specific
1103          * type, then for the generic unit. The clients may rely on
1104          * this order to get atomic behavior if needed. */
1105
1106         r = sd_bus_emit_properties_changed_strv(
1107                         bus, p,
1108                         unit_dbus_interface_from_type(u->type),
1109                         NULL);
1110         if (r < 0)
1111                 return r;
1112
1113         return sd_bus_emit_properties_changed_strv(
1114                         bus, p,
1115                         "org.freedesktop.systemd1.Unit",
1116                         NULL);
1117 }
1118
1119 void bus_unit_send_change_signal(Unit *u) {
1120         int r;
1121         assert(u);
1122
1123         if (u->in_dbus_queue) {
1124                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
1125                 u->in_dbus_queue = false;
1126         }
1127
1128         if (!u->id)
1129                 return;
1130
1131         r = bus_foreach_bus(u->manager, NULL, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
1132         if (r < 0)
1133                 log_unit_debug_errno(u, r, "Failed to send unit change signal for %s: %m", u->id);
1134
1135         u->sent_dbus_new_signal = true;
1136 }
1137
1138 static int send_removed_signal(sd_bus *bus, void *userdata) {
1139         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1140         _cleanup_free_ char *p = NULL;
1141         Unit *u = userdata;
1142         int r;
1143
1144         assert(bus);
1145         assert(u);
1146
1147         p = unit_dbus_path(u);
1148         if (!p)
1149                 return -ENOMEM;
1150
1151         r = sd_bus_message_new_signal(
1152                         bus,
1153                         &m,
1154                         "/org/freedesktop/systemd1",
1155                         "org.freedesktop.systemd1.Manager",
1156                         "UnitRemoved");
1157         if (r < 0)
1158                 return r;
1159
1160         r = sd_bus_message_append(m, "so", u->id, p);
1161         if (r < 0)
1162                 return r;
1163
1164         return sd_bus_send(bus, m, NULL);
1165 }
1166
1167 void bus_unit_send_removed_signal(Unit *u) {
1168         int r;
1169         assert(u);
1170
1171         if (!u->sent_dbus_new_signal || u->in_dbus_queue)
1172                 bus_unit_send_change_signal(u);
1173
1174         if (!u->id)
1175                 return;
1176
1177         r = bus_foreach_bus(u->manager, NULL, send_removed_signal, u);
1178         if (r < 0)
1179                 log_unit_debug_errno(u, r, "Failed to send unit remove signal for %s: %m", u->id);
1180 }
1181
1182 int bus_unit_queue_job(
1183                 sd_bus_message *message,
1184                 Unit *u,
1185                 JobType type,
1186                 JobMode mode,
1187                 bool reload_if_possible,
1188                 sd_bus_error *error) {
1189
1190         _cleanup_free_ char *path = NULL;
1191         Job *j;
1192         int r;
1193
1194         assert(message);
1195         assert(u);
1196         assert(type >= 0 && type < _JOB_TYPE_MAX);
1197         assert(mode >= 0 && mode < _JOB_MODE_MAX);
1198
1199         r = mac_selinux_unit_access_check(
1200                         u, message,
1201                         job_type_to_access_method(type),
1202                         error);
1203         if (r < 0)
1204                 return r;
1205
1206         if (reload_if_possible && unit_can_reload(u)) {
1207                 if (type == JOB_RESTART)
1208                         type = JOB_RELOAD_OR_START;
1209                 else if (type == JOB_TRY_RESTART)
1210                         type = JOB_TRY_RELOAD;
1211         }
1212
1213         if (type == JOB_STOP &&
1214             (u->load_state == UNIT_NOT_FOUND || u->load_state == UNIT_ERROR) &&
1215             unit_active_state(u) == UNIT_INACTIVE)
1216                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
1217
1218         if ((type == JOB_START && u->refuse_manual_start) ||
1219             (type == JOB_STOP && u->refuse_manual_stop) ||
1220             ((type == JOB_RESTART || type == JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)) ||
1221             (type == JOB_RELOAD_OR_START && job_type_collapse(type, u) == JOB_START && u->refuse_manual_start))
1222                 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only.", u->id);
1223
1224         r = manager_add_job(u->manager, type, u, mode, error, &j);
1225         if (r < 0)
1226                 return r;
1227
1228         if (sd_bus_message_get_bus(message) == u->manager->api_bus) {
1229                 if (!j->clients) {
1230                         r = sd_bus_track_new(sd_bus_message_get_bus(message), &j->clients, NULL, NULL);
1231                         if (r < 0)
1232                                 return r;
1233                 }
1234
1235                 r = sd_bus_track_add_sender(j->clients, message);
1236                 if (r < 0)
1237                         return r;
1238         }
1239
1240         path = job_dbus_path(j);
1241         if (!path)
1242                 return -ENOMEM;
1243
1244         return sd_bus_reply_method_return(message, "o", path);
1245 }
1246
1247 static int bus_unit_set_transient_property(
1248                 Unit *u,
1249                 const char *name,
1250                 sd_bus_message *message,
1251                 UnitSetPropertiesMode mode,
1252                 sd_bus_error *error) {
1253
1254         int r;
1255
1256         assert(u);
1257         assert(name);
1258         assert(message);
1259
1260         if (streq(name, "Description")) {
1261                 const char *d;
1262
1263                 r = sd_bus_message_read(message, "s", &d);
1264                 if (r < 0)
1265                         return r;
1266
1267                 if (mode != UNIT_CHECK) {
1268                         r = unit_set_description(u, d);
1269                         if (r < 0)
1270                                 return r;
1271
1272                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDescription=%s", d);
1273                 }
1274
1275                 return 1;
1276
1277         } else if (streq(name, "DefaultDependencies")) {
1278                 int b;
1279
1280                 r = sd_bus_message_read(message, "b", &b);
1281                 if (r < 0)
1282                         return r;
1283
1284                 if (mode != UNIT_CHECK) {
1285                         u->default_dependencies = b;
1286                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDefaultDependencies=%s", yes_no(b));
1287                 }
1288
1289                 return 1;
1290
1291         } else if (streq(name, "Slice")) {
1292                 Unit *slice;
1293                 const char *s;
1294
1295                 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1296                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "The slice property is only available for units with control groups.");
1297                 if (u->type == UNIT_SLICE)
1298                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Slice may not be set for slice units.");
1299                 if (unit_has_name(u, SPECIAL_INIT_SCOPE))
1300                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot set slice for init.scope");
1301
1302                 r = sd_bus_message_read(message, "s", &s);
1303                 if (r < 0)
1304                         return r;
1305
1306                 if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
1307                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name '%s'", s);
1308
1309                 /* Note that we do not dispatch the load queue here yet, as we don't want our own transient unit to be
1310                  * loaded while we are still setting it up. Or in other words, we use manager_load_unit_prepare()
1311                  * instead of manager_load_unit() on purpose, here. */
1312                 r = manager_load_unit_prepare(u->manager, s, NULL, error, &slice);
1313                 if (r < 0)
1314                         return r;
1315
1316                 if (slice->type != UNIT_SLICE)
1317                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit name '%s' is not a slice", s);
1318
1319                 if (mode != UNIT_CHECK) {
1320                         r = unit_set_slice(u, slice);
1321                         if (r < 0)
1322                                 return r;
1323
1324                         unit_write_drop_in_private_format(u, mode, name, "Slice=%s", s);
1325                 }
1326
1327                 return 1;
1328
1329         } else if (STR_IN_SET(name,
1330                               "Requires", "RequiresOverridable",
1331                               "Requisite", "RequisiteOverridable",
1332                               "Wants",
1333                               "BindsTo",
1334                               "Conflicts",
1335                               "Before", "After",
1336                               "OnFailure",
1337                               "PropagatesReloadTo", "ReloadPropagatedFrom",
1338                               "PartOf")) {
1339
1340                 UnitDependency d;
1341                 const char *other;
1342
1343                 if (streq(name, "RequiresOverridable"))
1344                         d = UNIT_REQUIRES; /* redirect for obsolete unit dependency type */
1345                 else if (streq(name, "RequisiteOverridable"))
1346                         d = UNIT_REQUISITE; /* same here */
1347                 else {
1348                         d = unit_dependency_from_string(name);
1349                         if (d < 0)
1350                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit dependency: %s", name);
1351                 }
1352
1353                 r = sd_bus_message_enter_container(message, 'a', "s");
1354                 if (r < 0)
1355                         return r;
1356
1357                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
1358                         if (!unit_name_is_valid(other, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
1359                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
1360
1361                         if (mode != UNIT_CHECK) {
1362                                 _cleanup_free_ char *label = NULL;
1363
1364                                 r = unit_add_dependency_by_name(u, d, other, NULL, true);
1365                                 if (r < 0)
1366                                         return r;
1367
1368                                 label = strjoin(name, "-", other, NULL);
1369                                 if (!label)
1370                                         return -ENOMEM;
1371
1372                                 unit_write_drop_in_format(u, mode, label, "[Unit]\n%s=%s", name, other);
1373                         }
1374
1375                 }
1376                 if (r < 0)
1377                         return r;
1378
1379                 r = sd_bus_message_exit_container(message);
1380                 if (r < 0)
1381                         return r;
1382
1383                 return 1;
1384
1385         } else if (streq(name, "AddRef")) {
1386
1387                 int b;
1388
1389                 /* Why is this called "AddRef" rather than just "Ref", or "Reference"? There's already a "Ref()" method
1390                  * on the Unit interface, and it's probably not a good idea to expose a property and a method on the
1391                  * same interface (well, strictly speaking AddRef isn't exposed as full property, we just read it for
1392                  * transient units, but still). And "References" and "ReferencedBy" is already used as unit reference
1393                  * dependency type, hence let's not confuse things with that.
1394                  *
1395                  * Note that we don't acually add the reference to the bus track. We do that only after the setup of
1396                  * the transient unit is complete, so that setting this property multiple times in the same transient
1397                  * unit creation call doesn't count as individual references. */
1398
1399                 r = sd_bus_message_read(message, "b", &b);
1400                 if (r < 0)
1401                         return r;
1402
1403                 if (mode != UNIT_CHECK)
1404                         u->bus_track_add = b;
1405
1406                 return 1;
1407         }
1408
1409         return 0;
1410 }
1411
1412 int bus_unit_set_properties(
1413                 Unit *u,
1414                 sd_bus_message *message,
1415                 UnitSetPropertiesMode mode,
1416                 bool commit,
1417                 sd_bus_error *error) {
1418
1419         bool for_real = false;
1420         unsigned n = 0;
1421         int r;
1422
1423         assert(u);
1424         assert(message);
1425
1426         /* We iterate through the array twice. First run we just check
1427          * if all passed data is valid, second run actually applies
1428          * it. This is to implement transaction-like behaviour without
1429          * actually providing full transactions. */
1430
1431         r = sd_bus_message_enter_container(message, 'a', "(sv)");
1432         if (r < 0)
1433                 return r;
1434
1435         for (;;) {
1436                 const char *name;
1437
1438                 r = sd_bus_message_enter_container(message, 'r', "sv");
1439                 if (r < 0)
1440                         return r;
1441                 if (r == 0) {
1442                         if (for_real || mode == UNIT_CHECK)
1443                                 break;
1444
1445                         /* Reached EOF. Let's try again, and this time for realz... */
1446                         r = sd_bus_message_rewind(message, false);
1447                         if (r < 0)
1448                                 return r;
1449
1450                         for_real = true;
1451                         continue;
1452                 }
1453
1454                 r = sd_bus_message_read(message, "s", &name);
1455                 if (r < 0)
1456                         return r;
1457
1458                 if (!UNIT_VTABLE(u)->bus_set_property)
1459                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
1460
1461                 r = sd_bus_message_enter_container(message, 'v', NULL);
1462                 if (r < 0)
1463                         return r;
1464
1465                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
1466                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
1467                         r = bus_unit_set_transient_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
1468                 if (r < 0)
1469                         return r;
1470                 if (r == 0)
1471                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
1472
1473                 r = sd_bus_message_exit_container(message);
1474                 if (r < 0)
1475                         return r;
1476
1477                 r = sd_bus_message_exit_container(message);
1478                 if (r < 0)
1479                         return r;
1480
1481                 n += for_real;
1482         }
1483
1484         r = sd_bus_message_exit_container(message);
1485         if (r < 0)
1486                 return r;
1487
1488         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
1489                 UNIT_VTABLE(u)->bus_commit_properties(u);
1490
1491         return n;
1492 }
1493
1494 int bus_unit_check_load_state(Unit *u, sd_bus_error *error) {
1495         assert(u);
1496
1497         if (u->load_state == UNIT_LOADED)
1498                 return 0;
1499
1500         /* Give a better description of the unit error when
1501          * possible. Note that in the case of UNIT_MASKED, load_error
1502          * is not set. */
1503         if (u->load_state == UNIT_MASKED)
1504                 return sd_bus_error_setf(error, BUS_ERROR_UNIT_MASKED, "Unit %s is masked.", u->id);
1505
1506         if (u->load_state == UNIT_NOT_FOUND)
1507                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not found.", u->id);
1508
1509         return sd_bus_error_set_errnof(error, u->load_error, "Unit %s is not loaded properly: %m.", u->id);
1510 }
1511
1512 static int bus_track_handler(sd_bus_track *t, void *userdata) {
1513         Unit *u = userdata;
1514
1515         assert(t);
1516         assert(u);
1517
1518         u->bus_track = sd_bus_track_unref(u->bus_track); /* make sure we aren't called again */
1519
1520         unit_add_to_gc_queue(u);
1521         return 0;
1522 }
1523
1524 static int allocate_bus_track(Unit *u) {
1525         int r;
1526
1527         assert(u);
1528
1529         if (u->bus_track)
1530                 return 0;
1531
1532         r = sd_bus_track_new(u->manager->api_bus, &u->bus_track, bus_track_handler, u);
1533         if (r < 0)
1534                 return r;
1535
1536         r = sd_bus_track_set_recursive(u->bus_track, true);
1537         if (r < 0) {
1538                 u->bus_track = sd_bus_track_unref(u->bus_track);
1539                 return r;
1540         }
1541
1542         return 0;
1543 }
1544
1545 int bus_unit_track_add_name(Unit *u, const char *name) {
1546         int r;
1547
1548         assert(u);
1549
1550         r = allocate_bus_track(u);
1551         if (r < 0)
1552                 return r;
1553
1554         return sd_bus_track_add_name(u->bus_track, name);
1555 }
1556
1557 int bus_unit_track_add_sender(Unit *u, sd_bus_message *m) {
1558         int r;
1559
1560         assert(u);
1561
1562         r = allocate_bus_track(u);
1563         if (r < 0)
1564                 return r;
1565
1566         return sd_bus_track_add_sender(u->bus_track, m);
1567 }
1568
1569 int bus_unit_track_remove_sender(Unit *u, sd_bus_message *m) {
1570         assert(u);
1571
1572         /* If we haven't allocated the bus track object yet, then there's definitely no reference taken yet, return an
1573          * error */
1574         if (!u->bus_track)
1575                 return -EUNATCH;
1576
1577         return sd_bus_track_remove_sender(u->bus_track, m);
1578 }