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-job.h"
  26 #include "dbus-unit.h"
  27 #include "dbus.h"
  28 #include "fd-util.h"
  29 #include "locale-util.h"
  30 #include "log.h"
  31 #include "process-util.h"
  32 #include "selinux-access.h"
  33 #include "signal-util.h"
  34 #include "special.h"
  35 #include "string-util.h"
  36 #include "strv.h"
  37 #include "user-util.h"
  38
  39 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_load_state, unit_load_state, UnitLoadState);
  40 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_job_mode, job_mode, JobMode);
  41 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_emergency_action, emergency_action, EmergencyAction);
  42
  43 static int property_get_names(
  44                 sd_bus *bus,
  45                 const char *path,
  46                 const char *interface,
  47                 const char *property,
  48                 sd_bus_message *reply,
  49                 void *userdata,
  50                 sd_bus_error *error) {
  51
  52         Unit *u = userdata;
  53         Iterator i;
  54         const char *t;
  55         int r;
  56
  57         assert(bus);
  58         assert(reply);
  59         assert(u);
  60
  61         r = sd_bus_message_open_container(reply, 'a', "s");
  62         if (r < 0)
  63                 return r;
  64
  65         SET_FOREACH(t, u->names, i) {
  66                 r = sd_bus_message_append(reply, "s", t);
  67                 if (r < 0)
  68                         return r;
  69         }
  70
  71         return sd_bus_message_close_container(reply);
  72 }
  73
  74 static int property_get_following(
  75                 sd_bus *bus,
  76                 const char *path,
  77                 const char *interface,
  78                 const char *property,
  79                 sd_bus_message *reply,
  80                 void *userdata,
  81                 sd_bus_error *error) {
  82
  83         Unit *u = userdata, *f;
  84
  85         assert(bus);
  86         assert(reply);
  87         assert(u);
  88
  89         f = unit_following(u);
  90         return sd_bus_message_append(reply, "s", f ? f->id : "");
  91 }
  92
  93 static int property_get_dependencies(
  94                 sd_bus *bus,
  95                 const char *path,
  96                 const char *interface,
  97                 const char *property,
  98                 sd_bus_message *reply,
  99                 void *userdata,
 100                 sd_bus_error *error) {
 101
 102         Set *s = *(Set**) userdata;
 103         Iterator j;
 104         Unit *u;
 105         int r;
 106
 107         assert(bus);
 108         assert(reply);
 109
 110         r = sd_bus_message_open_container(reply, 'a', "s");
 111         if (r < 0)
 112                 return r;
 113
 114         SET_FOREACH(u, s, j) {
 115                 r = sd_bus_message_append(reply, "s", u->id);
 116                 if (r < 0)
 117                         return r;
 118         }
 119
 120         return sd_bus_message_close_container(reply);
 121 }
 122
 123 static int property_get_obsolete_dependencies(
 124                 sd_bus *bus,
 125                 const char *path,
 126                 const char *interface,
 127                 const char *property,
 128                 sd_bus_message *reply,
 129                 void *userdata,
 130                 sd_bus_error *error) {
 131
 132         assert(bus);
 133         assert(reply);
 134
 135         /* For dependency types we don't support anymore always return an empty array */
 136         return sd_bus_message_append(reply, "as", 0);
 137 }
 138
 139 static int property_get_description(
 140                 sd_bus *bus,
 141                 const char *path,
 142                 const char *interface,
 143                 const char *property,
 144                 sd_bus_message *reply,
 145                 void *userdata,
 146                 sd_bus_error *error) {
 147
 148         Unit *u = userdata;
 149
 150         assert(bus);
 151         assert(reply);
 152         assert(u);
 153
 154         return sd_bus_message_append(reply, "s", unit_description(u));
 155 }
 156
 157 static int property_get_active_state(
 158                 sd_bus *bus,
 159                 const char *path,
 160                 const char *interface,
 161                 const char *property,
 162                 sd_bus_message *reply,
 163                 void *userdata,
 164                 sd_bus_error *error) {
 165
 166         Unit *u = userdata;
 167
 168         assert(bus);
 169         assert(reply);
 170         assert(u);
 171
 172         return sd_bus_message_append(reply, "s", unit_active_state_to_string(unit_active_state(u)));
 173 }
 174
 175 static int property_get_sub_state(
 176                 sd_bus *bus,
 177                 const char *path,
 178                 const char *interface,
 179                 const char *property,
 180                 sd_bus_message *reply,
 181                 void *userdata,
 182                 sd_bus_error *error) {
 183
 184         Unit *u = userdata;
 185
 186         assert(bus);
 187         assert(reply);
 188         assert(u);
 189
 190         return sd_bus_message_append(reply, "s", unit_sub_state_to_string(u));
 191 }
 192
 193 static int property_get_unit_file_preset(
 194                 sd_bus *bus,
 195                 const char *path,
 196                 const char *interface,
 197                 const char *property,
 198                 sd_bus_message *reply,
 199                 void *userdata,
 200                 sd_bus_error *error) {
 201
 202         Unit *u = userdata;
 203         int r;
 204
 205         assert(bus);
 206         assert(reply);
 207         assert(u);
 208
 209         r = unit_get_unit_file_preset(u);
 210
 211         return sd_bus_message_append(reply, "s",
 212                                      r < 0 ? "":
 213                                      r > 0 ? "enabled" : "disabled");
 214 }
 215
 216 static int property_get_unit_file_state(
 217                 sd_bus *bus,
 218                 const char *path,
 219                 const char *interface,
 220                 const char *property,
 221                 sd_bus_message *reply,
 222                 void *userdata,
 223                 sd_bus_error *error) {
 224
 225         Unit *u = userdata;
 226
 227         assert(bus);
 228         assert(reply);
 229         assert(u);
 230
 231         return sd_bus_message_append(reply, "s", unit_file_state_to_string(unit_get_unit_file_state(u)));
 232 }
 233
 234 static int property_get_can_start(
 235                 sd_bus *bus,
 236                 const char *path,
 237                 const char *interface,
 238                 const char *property,
 239                 sd_bus_message *reply,
 240                 void *userdata,
 241                 sd_bus_error *error) {
 242
 243         Unit *u = userdata;
 244
 245         assert(bus);
 246         assert(reply);
 247         assert(u);
 248
 249         return sd_bus_message_append(reply, "b", unit_can_start(u) && !u->refuse_manual_start);
 250 }
 251
 252 static int property_get_can_stop(
 253                 sd_bus *bus,
 254                 const char *path,
 255                 const char *interface,
 256                 const char *property,
 257                 sd_bus_message *reply,
 258                 void *userdata,
 259                 sd_bus_error *error) {
 260
 261         Unit *u = userdata;
 262
 263         assert(bus);
 264         assert(reply);
 265         assert(u);
 266
 267         return sd_bus_message_append(reply, "b", unit_can_stop(u) && !u->refuse_manual_stop);
 268 }
 269
 270 static int property_get_can_reload(
 271                 sd_bus *bus,
 272                 const char *path,
 273                 const char *interface,
 274                 const char *property,
 275                 sd_bus_message *reply,
 276                 void *userdata,
 277                 sd_bus_error *error) {
 278
 279         Unit *u = userdata;
 280
 281         assert(bus);
 282         assert(reply);
 283         assert(u);
 284
 285         return sd_bus_message_append(reply, "b", unit_can_reload(u));
 286 }
 287
 288 static int property_get_can_isolate(
 289                 sd_bus *bus,
 290                 const char *path,
 291                 const char *interface,
 292                 const char *property,
 293                 sd_bus_message *reply,
 294                 void *userdata,
 295                 sd_bus_error *error) {
 296
 297         Unit *u = userdata;
 298
 299         assert(bus);
 300         assert(reply);
 301         assert(u);
 302
 303         return sd_bus_message_append(reply, "b", unit_can_isolate(u) && !u->refuse_manual_start);
 304 }
 305
 306 static int property_get_job(
 307                 sd_bus *bus,
 308                 const char *path,
 309                 const char *interface,
 310                 const char *property,
 311                 sd_bus_message *reply,
 312                 void *userdata,
 313                 sd_bus_error *error) {
 314
 315         _cleanup_free_ char *p = NULL;
 316         Unit *u = userdata;
 317
 318         assert(bus);
 319         assert(reply);
 320         assert(u);
 321
 322         if (!u->job)
 323                 return sd_bus_message_append(reply, "(uo)", 0, "/");
 324
 325         p = job_dbus_path(u->job);
 326         if (!p)
 327                 return -ENOMEM;
 328
 329         return sd_bus_message_append(reply, "(uo)", u->job->id, p);
 330 }
 331
 332 static int property_get_need_daemon_reload(
 333                 sd_bus *bus,
 334                 const char *path,
 335                 const char *interface,
 336                 const char *property,
 337                 sd_bus_message *reply,
 338                 void *userdata,
 339                 sd_bus_error *error) {
 340
 341         Unit *u = userdata;
 342
 343         assert(bus);
 344         assert(reply);
 345         assert(u);
 346
 347         return sd_bus_message_append(reply, "b", unit_need_daemon_reload(u));
 348 }
 349
 350 static int property_get_conditions(
 351                 sd_bus *bus,
 352                 const char *path,
 353                 const char *interface,
 354                 const char *property,
 355                 sd_bus_message *reply,
 356                 void *userdata,
 357                 sd_bus_error *error) {
 358
 359         const char *(*to_string)(ConditionType type) = NULL;
 360         Condition **list = userdata, *c;
 361         int r;
 362
 363         assert(bus);
 364         assert(reply);
 365         assert(list);
 366
 367         to_string = streq(property, "Asserts") ? assert_type_to_string : condition_type_to_string;
 368
 369         r = sd_bus_message_open_container(reply, 'a', "(sbbsi)");
 370         if (r < 0)
 371                 return r;
 372
 373         LIST_FOREACH(conditions, c, *list) {
 374                 int tristate;
 375
 376                 tristate =
 377                         c->result == CONDITION_UNTESTED ? 0 :
 378                         c->result == CONDITION_SUCCEEDED ? 1 : -1;
 379
 380                 r = sd_bus_message_append(reply, "(sbbsi)",
 381                                           to_string(c->type),
 382                                           c->trigger, c->negate,
 383                                           c->parameter, tristate);
 384                 if (r < 0)
 385                         return r;
 386
 387         }
 388
 389         return sd_bus_message_close_container(reply);
 390 }
 391
 392 static int property_get_load_error(
 393                 sd_bus *bus,
 394                 const char *path,
 395                 const char *interface,
 396                 const char *property,
 397                 sd_bus_message *reply,
 398                 void *userdata,
 399                 sd_bus_error *error) {
 400
 401         _cleanup_(sd_bus_error_free) sd_bus_error e = SD_BUS_ERROR_NULL;
 402         Unit *u = userdata;
 403
 404         assert(bus);
 405         assert(reply);
 406         assert(u);
 407
 408         if (u->load_error != 0)
 409                 sd_bus_error_set_errno(&e, u->load_error);
 410
 411         return sd_bus_message_append(reply, "(ss)", e.name, e.message);
 412 }
 413
 414 static int bus_verify_manage_units_async_full(
 415                 Unit *u,
 416                 const char *verb,
 417                 int capability,
 418                 const char *polkit_message,
 419                 bool interactive,
 420                 sd_bus_message *call,
 421                 sd_bus_error *error) {
 422
 423         const char *details[9] = {
 424                 "unit", u->id,
 425                 "verb", verb,
 426         };
 427
 428         if (polkit_message) {
 429                 details[4] = "polkit.message";
 430                 details[5] = polkit_message;
 431                 details[6] = "polkit.gettext_domain";
 432                 details[7] = GETTEXT_PACKAGE;
 433         }
 434
 435         return bus_verify_polkit_async(
 436                         call,
 437                         capability,
 438                         "org.freedesktop.systemd1.manage-units",
 439                         details,
 440                         interactive,
 441                         UID_INVALID,
 442                         &u->manager->polkit_registry,
 443                         error);
 444 }
 445
 446 int bus_unit_method_start_generic(
 447                 sd_bus_message *message,
 448                 Unit *u,
 449                 JobType job_type,
 450                 bool reload_if_possible,
 451                 sd_bus_error *error) {
 452
 453         const char *smode;
 454         JobMode mode;
 455         _cleanup_free_ char *verb = NULL;
 456         static const char *const polkit_message_for_job[_JOB_TYPE_MAX] = {
 457                 [JOB_START]       = N_("Authentication is required to start '$(unit)'."),
 458                 [JOB_STOP]        = N_("Authentication is required to stop '$(unit)'."),
 459                 [JOB_RELOAD]      = N_("Authentication is required to reload '$(unit)'."),
 460                 [JOB_RESTART]     = N_("Authentication is required to restart '$(unit)'."),
 461                 [JOB_TRY_RESTART] = N_("Authentication is required to restart '$(unit)'."),
 462         };
 463         int r;
 464
 465         assert(message);
 466         assert(u);
 467         assert(job_type >= 0 && job_type < _JOB_TYPE_MAX);
 468
 469         r = mac_selinux_unit_access_check(
 470                         u, message,
 471                         job_type_to_access_method(job_type),
 472                         error);
 473         if (r < 0)
 474                 return r;
 475
 476         r = sd_bus_message_read(message, "s", &smode);
 477         if (r < 0)
 478                 return r;
 479
 480         mode = job_mode_from_string(smode);
 481         if (mode < 0)
 482                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s invalid", smode);
 483
 484         if (reload_if_possible)
 485                 verb = strjoin("reload-or-", job_type_to_string(job_type));
 486         else
 487                 verb = strdup(job_type_to_string(job_type));
 488         if (!verb)
 489                 return -ENOMEM;
 490
 491         r = bus_verify_manage_units_async_full(
 492                         u,
 493                         verb,
 494                         CAP_SYS_ADMIN,
 495                         job_type < _JOB_TYPE_MAX ? polkit_message_for_job[job_type] : NULL,
 496                         true,
 497                         message,
 498                         error);
 499         if (r < 0)
 500                 return r;
 501         if (r == 0)
 502                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 503
 504         return bus_unit_queue_job(message, u, job_type, mode, reload_if_possible, error);
 505 }
 506
 507 static int method_start(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 508         return bus_unit_method_start_generic(message, userdata, JOB_START, false, error);
 509 }
 510
 511 static int method_stop(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 512         return bus_unit_method_start_generic(message, userdata, JOB_STOP, false, error);
 513 }
 514
 515 static int method_reload(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 516         return bus_unit_method_start_generic(message, userdata, JOB_RELOAD, false, error);
 517 }
 518
 519 static int method_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 520         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, false, error);
 521 }
 522
 523 static int method_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 524         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, false, error);
 525 }
 526
 527 static int method_reload_or_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 528         return bus_unit_method_start_generic(message, userdata, JOB_RESTART, true, error);
 529 }
 530
 531 static int method_reload_or_try_restart(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 532         return bus_unit_method_start_generic(message, userdata, JOB_TRY_RESTART, true, error);
 533 }
 534
 535 int bus_unit_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 536         Unit *u = userdata;
 537         const char *swho;
 538         int32_t signo;
 539         KillWho who;
 540         int r;
 541
 542         assert(message);
 543         assert(u);
 544
 545         r = mac_selinux_unit_access_check(u, message, "stop", error);
 546         if (r < 0)
 547                 return r;
 548
 549         r = sd_bus_message_read(message, "si", &swho, &signo);
 550         if (r < 0)
 551                 return r;
 552
 553         if (isempty(swho))
 554                 who = KILL_ALL;
 555         else {
 556                 who = kill_who_from_string(swho);
 557                 if (who < 0)
 558                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid who argument %s", swho);
 559         }
 560
 561         if (!SIGNAL_VALID(signo))
 562                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Signal number out of range.");
 563
 564         r = bus_verify_manage_units_async_full(
 565                         u,
 566                         "kill",
 567                         CAP_KILL,
 568                         N_("Authentication is required to kill '$(unit)'."),
 569                         true,
 570                         message,
 571                         error);
 572         if (r < 0)
 573                 return r;
 574         if (r == 0)
 575                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 576
 577         r = unit_kill(u, who, signo, error);
 578         if (r < 0)
 579                 return r;
 580
 581         return sd_bus_reply_method_return(message, NULL);
 582 }
 583
 584 int bus_unit_method_reset_failed(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 585         Unit *u = userdata;
 586         int r;
 587
 588         assert(message);
 589         assert(u);
 590
 591         r = mac_selinux_unit_access_check(u, message, "reload", error);
 592         if (r < 0)
 593                 return r;
 594
 595         r = bus_verify_manage_units_async_full(
 596                         u,
 597                         "reset-failed",
 598                         CAP_SYS_ADMIN,
 599                         N_("Authentication is required to reset the \"failed\" state of '$(unit)'."),
 600                         true,
 601                         message,
 602                         error);
 603         if (r < 0)
 604                 return r;
 605         if (r == 0)
 606                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 607
 608         unit_reset_failed(u);
 609
 610         return sd_bus_reply_method_return(message, NULL);
 611 }
 612
 613 int bus_unit_method_set_properties(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 614         Unit *u = userdata;
 615         int runtime, r;
 616
 617         assert(message);
 618         assert(u);
 619
 620         r = mac_selinux_unit_access_check(u, message, "start", error);
 621         if (r < 0)
 622                 return r;
 623
 624         r = sd_bus_message_read(message, "b", &runtime);
 625         if (r < 0)
 626                 return r;
 627
 628         r = bus_verify_manage_units_async_full(
 629                         u,
 630                         "set-property",
 631                         CAP_SYS_ADMIN,
 632                         N_("Authentication is required to set properties on '$(unit)'."),
 633                         true,
 634                         message,
 635                         error);
 636         if (r < 0)
 637                 return r;
 638         if (r == 0)
 639                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 640
 641         r = bus_unit_set_properties(u, message, runtime ? UNIT_RUNTIME : UNIT_PERSISTENT, true, error);
 642         if (r < 0)
 643                 return r;
 644
 645         return sd_bus_reply_method_return(message, NULL);
 646 }
 647
 648 int bus_unit_method_ref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 649         Unit *u = userdata;
 650         int r;
 651
 652         assert(message);
 653         assert(u);
 654
 655         r = mac_selinux_unit_access_check(u, message, "start", error);
 656         if (r < 0)
 657                 return r;
 658
 659         r = bus_verify_manage_units_async_full(
 660                         u,
 661                         "ref",
 662                         CAP_SYS_ADMIN,
 663                         NULL,
 664                         false,
 665                         message,
 666                         error);
 667         if (r < 0)
 668                 return r;
 669         if (r == 0)
 670                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 671
 672         r = bus_unit_track_add_sender(u, message);
 673         if (r < 0)
 674                 return r;
 675
 676         return sd_bus_reply_method_return(message, NULL);
 677 }
 678
 679 int bus_unit_method_unref(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 680         Unit *u = userdata;
 681         int r;
 682
 683         assert(message);
 684         assert(u);
 685
 686         r = bus_unit_track_remove_sender(u, message);
 687         if (r == -EUNATCH)
 688                 return sd_bus_error_setf(error, BUS_ERROR_NOT_REFERENCED, "Unit has not been referenced yet.");
 689         if (r < 0)
 690                 return r;
 691
 692         return sd_bus_reply_method_return(message, NULL);
 693 }
 694
 695 const sd_bus_vtable bus_unit_vtable[] = {
 696         SD_BUS_VTABLE_START(0),
 697
 698         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Unit, id), SD_BUS_VTABLE_PROPERTY_CONST),
 699         SD_BUS_PROPERTY("Names", "as", property_get_names, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 700         SD_BUS_PROPERTY("Following", "s", property_get_following, 0, 0),
 701         SD_BUS_PROPERTY("Requires", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES]), SD_BUS_VTABLE_PROPERTY_CONST),
 702         SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), SD_BUS_VTABLE_PROPERTY_CONST),
 703         SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 704         SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 705         SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 706         SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 707         SD_BUS_PROPERTY("RequisiteOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 708         SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 709         SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 710         SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 711         SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 712         SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 713         SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), SD_BUS_VTABLE_PROPERTY_CONST),
 714         SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), SD_BUS_VTABLE_PROPERTY_CONST),
 715         SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), SD_BUS_VTABLE_PROPERTY_CONST),
 716         SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), SD_BUS_VTABLE_PROPERTY_CONST),
 717         SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 718         SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 719         SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), SD_BUS_VTABLE_PROPERTY_CONST),
 720         SD_BUS_PROPERTY("JoinsNamespaceOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_JOINS_NAMESPACE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 721         SD_BUS_PROPERTY("RequiresMountsFor", "as", NULL, offsetof(Unit, requires_mounts_for), SD_BUS_VTABLE_PROPERTY_CONST),
 722         SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), SD_BUS_VTABLE_PROPERTY_CONST),
 723         SD_BUS_PROPERTY("Description", "s", property_get_description, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 724         SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), SD_BUS_VTABLE_PROPERTY_CONST),
 725         SD_BUS_PROPERTY("ActiveState", "s", property_get_active_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 726         SD_BUS_PROPERTY("SubState", "s", property_get_sub_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 727         SD_BUS_PROPERTY("FragmentPath", "s", NULL, offsetof(Unit, fragment_path), SD_BUS_VTABLE_PROPERTY_CONST),
 728         SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), SD_BUS_VTABLE_PROPERTY_CONST),
 729         SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), SD_BUS_VTABLE_PROPERTY_CONST),
 730         SD_BUS_PROPERTY("UnitFileState", "s", property_get_unit_file_state, 0, 0),
 731         SD_BUS_PROPERTY("UnitFilePreset", "s", property_get_unit_file_preset, 0, 0),
 732         BUS_PROPERTY_DUAL_TIMESTAMP("StateChangeTimestamp", offsetof(Unit, state_change_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 733         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveExitTimestamp", offsetof(Unit, inactive_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 734         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveEnterTimestamp", offsetof(Unit, active_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 735         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveExitTimestamp", offsetof(Unit, active_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 736         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveEnterTimestamp", offsetof(Unit, inactive_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 737         SD_BUS_PROPERTY("CanStart", "b", property_get_can_start, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 738         SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 739         SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 740         SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 741         SD_BUS_PROPERTY("Job", "(uo)", property_get_job, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 742         SD_BUS_PROPERTY("StopWhenUnneeded", "b", bus_property_get_bool, offsetof(Unit, stop_when_unneeded), SD_BUS_VTABLE_PROPERTY_CONST),
 743         SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), SD_BUS_VTABLE_PROPERTY_CONST),
 744         SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), SD_BUS_VTABLE_PROPERTY_CONST),
 745         SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 746         SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), SD_BUS_VTABLE_PROPERTY_CONST),
 747         SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), SD_BUS_VTABLE_PROPERTY_CONST),
 748         SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 749         SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 750         SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
 751         SD_BUS_PROPERTY("JobTimeoutAction", "s", property_get_emergency_action, offsetof(Unit, job_timeout_action), SD_BUS_VTABLE_PROPERTY_CONST),
 752         SD_BUS_PROPERTY("JobTimeoutRebootArgument", "s", NULL, offsetof(Unit, job_timeout_reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 753         SD_BUS_PROPERTY("ConditionResult", "b", bus_property_get_bool, offsetof(Unit, condition_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 754         SD_BUS_PROPERTY("AssertResult", "b", bus_property_get_bool, offsetof(Unit, assert_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 755         BUS_PROPERTY_DUAL_TIMESTAMP("ConditionTimestamp", offsetof(Unit, condition_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 756         BUS_PROPERTY_DUAL_TIMESTAMP("AssertTimestamp", offsetof(Unit, assert_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 757         SD_BUS_PROPERTY("Conditions", "a(sbbsi)", property_get_conditions, offsetof(Unit, conditions), 0),
 758         SD_BUS_PROPERTY("Asserts", "a(sbbsi)", property_get_conditions, offsetof(Unit, asserts), 0),
 759         SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 760         SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), SD_BUS_VTABLE_PROPERTY_CONST),
 761         SD_BUS_PROPERTY("Perpetual", "b", bus_property_get_bool, offsetof(Unit, perpetual), SD_BUS_VTABLE_PROPERTY_CONST),
 762         SD_BUS_PROPERTY("StartLimitIntervalSec", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST),
 763         SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Unit, start_limit.burst), SD_BUS_VTABLE_PROPERTY_CONST),
 764         SD_BUS_PROPERTY("StartLimitAction", "s", property_get_emergency_action, offsetof(Unit, start_limit_action), SD_BUS_VTABLE_PROPERTY_CONST),
 765         SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Unit, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
 766         SD_BUS_PROPERTY("InvocationID", "ay", bus_property_get_id128, offsetof(Unit, invocation_id), 0),
 767
 768         SD_BUS_METHOD("Start", "s", "o", method_start, SD_BUS_VTABLE_UNPRIVILEGED),
 769         SD_BUS_METHOD("Stop", "s", "o", method_stop, SD_BUS_VTABLE_UNPRIVILEGED),
 770         SD_BUS_METHOD("Reload", "s", "o", method_reload, SD_BUS_VTABLE_UNPRIVILEGED),
 771         SD_BUS_METHOD("Restart", "s", "o", method_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 772         SD_BUS_METHOD("TryRestart", "s", "o", method_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 773         SD_BUS_METHOD("ReloadOrRestart", "s", "o", method_reload_or_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 774         SD_BUS_METHOD("ReloadOrTryRestart", "s", "o", method_reload_or_try_restart, SD_BUS_VTABLE_UNPRIVILEGED),
 775         SD_BUS_METHOD("Kill", "si", NULL, bus_unit_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 776         SD_BUS_METHOD("ResetFailed", NULL, NULL, bus_unit_method_reset_failed, SD_BUS_VTABLE_UNPRIVILEGED),
 777         SD_BUS_METHOD("SetProperties", "ba(sv)", NULL, bus_unit_method_set_properties, SD_BUS_VTABLE_UNPRIVILEGED),
 778         SD_BUS_METHOD("Ref", NULL, NULL, bus_unit_method_ref, SD_BUS_VTABLE_UNPRIVILEGED),
 779         SD_BUS_METHOD("Unref", NULL, NULL, bus_unit_method_unref, SD_BUS_VTABLE_UNPRIVILEGED),
 780
 781         /* Obsolete properties or obsolete alias names */
 782         SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 783         SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 784         SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 785         SD_BUS_PROPERTY("RequisiteOfOverridable", "as", property_get_obsolete_dependencies, 0, SD_BUS_VTABLE_HIDDEN),
 786         SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
 787         SD_BUS_VTABLE_END
 788 };
 789
 790 static int property_get_slice(
 791                 sd_bus *bus,
 792                 const char *path,
 793                 const char *interface,
 794                 const char *property,
 795                 sd_bus_message *reply,
 796                 void *userdata,
 797                 sd_bus_error *error) {
 798
 799         Unit *u = userdata;
 800
 801         assert(bus);
 802         assert(reply);
 803         assert(u);
 804
 805         return sd_bus_message_append(reply, "s", unit_slice_name(u));
 806 }
 807
 808 static int property_get_current_memory(
 809                 sd_bus *bus,
 810                 const char *path,
 811                 const char *interface,
 812                 const char *property,
 813                 sd_bus_message *reply,
 814                 void *userdata,
 815                 sd_bus_error *error) {
 816
 817         uint64_t sz = (uint64_t) -1;
 818         Unit *u = userdata;
 819         int r;
 820
 821         assert(bus);
 822         assert(reply);
 823         assert(u);
 824
 825         r = unit_get_memory_current(u, &sz);
 826         if (r < 0 && r != -ENODATA)
 827                 log_unit_warning_errno(u, r, "Failed to get memory.usage_in_bytes attribute: %m");
 828
 829         return sd_bus_message_append(reply, "t", sz);
 830 }
 831
 832 static int property_get_current_tasks(
 833                 sd_bus *bus,
 834                 const char *path,
 835                 const char *interface,
 836                 const char *property,
 837                 sd_bus_message *reply,
 838                 void *userdata,
 839                 sd_bus_error *error) {
 840
 841         uint64_t cn = (uint64_t) -1;
 842         Unit *u = userdata;
 843         int r;
 844
 845         assert(bus);
 846         assert(reply);
 847         assert(u);
 848
 849         r = unit_get_tasks_current(u, &cn);
 850         if (r < 0 && r != -ENODATA)
 851                 log_unit_warning_errno(u, r, "Failed to get pids.current attribute: %m");
 852
 853         return sd_bus_message_append(reply, "t", cn);
 854 }
 855
 856 static int property_get_cpu_usage(
 857                 sd_bus *bus,
 858                 const char *path,
 859                 const char *interface,
 860                 const char *property,
 861                 sd_bus_message *reply,
 862                 void *userdata,
 863                 sd_bus_error *error) {
 864
 865         nsec_t ns = (nsec_t) -1;
 866         Unit *u = userdata;
 867         int r;
 868
 869         assert(bus);
 870         assert(reply);
 871         assert(u);
 872
 873         r = unit_get_cpu_usage(u, &ns);
 874         if (r < 0 && r != -ENODATA)
 875                 log_unit_warning_errno(u, r, "Failed to get cpuacct.usage attribute: %m");
 876
 877         return sd_bus_message_append(reply, "t", ns);
 878 }
 879
 880 static int property_get_cgroup(
 881                 sd_bus *bus,
 882                 const char *path,
 883                 const char *interface,
 884                 const char *property,
 885                 sd_bus_message *reply,
 886                 void *userdata,
 887                 sd_bus_error *error) {
 888
 889         Unit *u = userdata;
 890         const char *t;
 891
 892         assert(bus);
 893         assert(reply);
 894         assert(u);
 895
 896         /* Three cases: a) u->cgroup_path is NULL, in which case the
 897          * unit has no control group, which we report as the empty
 898          * string. b) u->cgroup_path is the empty string, which
 899          * indicates the root cgroup, which we report as "/". c) all
 900          * other cases we report as-is. */
 901
 902         if (u->cgroup_path)
 903                 t = isempty(u->cgroup_path) ? "/" : u->cgroup_path;
 904         else
 905                 t = "";
 906
 907         return sd_bus_message_append(reply, "s", t);
 908 }
 909
 910 static int append_process(sd_bus_message *reply, const char *p, pid_t pid, Set *pids) {
 911         _cleanup_free_ char *buf = NULL, *cmdline = NULL;
 912         int r;
 913
 914         assert(reply);
 915         assert(pid > 0);
 916
 917         r = set_put(pids, PID_TO_PTR(pid));
 918         if (r == -EEXIST || r == 0)
 919                 return 0;
 920         if (r < 0)
 921                 return r;
 922
 923         if (!p) {
 924                 r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &buf);
 925                 if (r == -ESRCH)
 926                         return 0;
 927                 if (r < 0)
 928                         return r;
 929
 930                 p = buf;
 931         }
 932
 933         (void) get_process_cmdline(pid, 0, true, &cmdline);
 934
 935         return sd_bus_message_append(reply,
 936                                      "(sus)",
 937                                      p,
 938                                      (uint32_t) pid,
 939                                      cmdline);
 940 }
 941
 942 static int append_cgroup(sd_bus_message *reply, const char *p, Set *pids) {
 943         _cleanup_closedir_ DIR *d = NULL;
 944         _cleanup_fclose_ FILE *f = NULL;
 945         int r;
 946
 947         assert(reply);
 948         assert(p);
 949
 950         r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, p, &f);
 951         if (r == ENOENT)
 952                 return 0;
 953         if (r < 0)
 954                 return r;
 955
 956         for (;;) {
 957                 pid_t pid;
 958
 959                 r = cg_read_pid(f, &pid);
 960                 if (r < 0)
 961                         return r;
 962                 if (r == 0)
 963                         break;
 964
 965                 if (is_kernel_thread(pid) > 0)
 966                         continue;
 967
 968                 r = append_process(reply, p, pid, pids);
 969                 if (r < 0)
 970                         return r;
 971         }
 972
 973         r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, p, &d);
 974         if (r == -ENOENT)
 975                 return 0;
 976         if (r < 0)
 977                 return r;
 978
 979         for (;;) {
 980                 _cleanup_free_ char *g = NULL, *j = NULL;
 981
 982                 r = cg_read_subgroup(d, &g);
 983                 if (r < 0)
 984                         return r;
 985                 if (r == 0)
 986                         break;
 987
 988                 j = strjoin(p, "/", g);
 989                 if (!j)
 990                         return -ENOMEM;
 991
 992                 r = append_cgroup(reply, j, pids);
 993                 if (r < 0)
 994                         return r;
 995         }
 996
 997         return 0;
 998 }
 999
1000 int bus_unit_method_get_processes(sd_bus_message *message, void *userdata, sd_bus_error *error) {
1001         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1002         _cleanup_(set_freep) Set *pids = NULL;
1003         Unit *u = userdata;
1004         pid_t pid;
1005         int r;
1006
1007         assert(message);
1008
1009         pids = set_new(NULL);
1010         if (!pids)
1011                 return -ENOMEM;
1012
1013         r = sd_bus_message_new_method_return(message, &reply);
1014         if (r < 0)
1015                 return r;
1016
1017         r = sd_bus_message_open_container(reply, 'a', "(sus)");
1018         if (r < 0)
1019                 return r;
1020
1021         if (u->cgroup_path) {
1022                 r = append_cgroup(reply, u->cgroup_path, pids);
1023                 if (r < 0)
1024                         return r;
1025         }
1026
1027         /* The main and control pids might live outside of the cgroup, hence fetch them separately */
1028         pid = unit_main_pid(u);
1029         if (pid > 0) {
1030                 r = append_process(reply, NULL, pid, pids);
1031                 if (r < 0)
1032                         return r;
1033         }
1034
1035         pid = unit_control_pid(u);
1036         if (pid > 0) {
1037                 r = append_process(reply, NULL, pid, pids);
1038                 if (r < 0)
1039                         return r;
1040         }
1041
1042         r = sd_bus_message_close_container(reply);
1043         if (r < 0)
1044                 return r;
1045
1046         return sd_bus_send(NULL, reply, NULL);
1047 }
1048
1049 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
1050         SD_BUS_VTABLE_START(0),
1051         SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
1052         SD_BUS_PROPERTY("ControlGroup", "s", property_get_cgroup, 0, 0),
1053         SD_BUS_PROPERTY("MemoryCurrent", "t", property_get_current_memory, 0, 0),
1054         SD_BUS_PROPERTY("CPUUsageNSec", "t", property_get_cpu_usage, 0, 0),
1055         SD_BUS_PROPERTY("TasksCurrent", "t", property_get_current_tasks, 0, 0),
1056         SD_BUS_METHOD("GetProcesses", NULL, "a(sus)", bus_unit_method_get_processes, SD_BUS_VTABLE_UNPRIVILEGED),
1057         SD_BUS_VTABLE_END
1058 };
1059
1060 static int send_new_signal(sd_bus *bus, void *userdata) {
1061         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1062         _cleanup_free_ char *p = NULL;
1063         Unit *u = userdata;
1064         int r;
1065
1066         assert(bus);
1067         assert(u);
1068
1069         p = unit_dbus_path(u);
1070         if (!p)
1071                 return -ENOMEM;
1072
1073         r = sd_bus_message_new_signal(
1074                         bus,
1075                         &m,
1076                         "/org/freedesktop/systemd1",
1077                         "org.freedesktop.systemd1.Manager",
1078                         "UnitNew");
1079         if (r < 0)
1080                 return r;
1081
1082         r = sd_bus_message_append(m, "so", u->id, p);
1083         if (r < 0)
1084                 return r;
1085
1086         return sd_bus_send(bus, m, NULL);
1087 }
1088
1089 static int send_changed_signal(sd_bus *bus, void *userdata) {
1090         _cleanup_free_ char *p = NULL;
1091         Unit *u = userdata;
1092         int r;
1093
1094         assert(bus);
1095         assert(u);
1096
1097         p = unit_dbus_path(u);
1098         if (!p)
1099                 return -ENOMEM;
1100
1101         /* Send a properties changed signal. First for the specific
1102          * type, then for the generic unit. The clients may rely on
1103          * this order to get atomic behavior if needed. */
1104
1105         r = sd_bus_emit_properties_changed_strv(
1106                         bus, p,
1107                         unit_dbus_interface_from_type(u->type),
1108                         NULL);
1109         if (r < 0)
1110                 return r;
1111
1112         return sd_bus_emit_properties_changed_strv(
1113                         bus, p,
1114                         "org.freedesktop.systemd1.Unit",
1115                         NULL);
1116 }
1117
1118 void bus_unit_send_change_signal(Unit *u) {
1119         int r;
1120         assert(u);
1121
1122         if (u->in_dbus_queue) {
1123                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
1124                 u->in_dbus_queue = false;
1125         }
1126
1127         if (!u->id)
1128                 return;
1129
1130         r = bus_foreach_bus(u->manager, NULL, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
1131         if (r < 0)
1132                 log_unit_debug_errno(u, r, "Failed to send unit change signal for %s: %m", u->id);
1133
1134         u->sent_dbus_new_signal = true;
1135 }
1136
1137 static int send_removed_signal(sd_bus *bus, void *userdata) {
1138         _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
1139         _cleanup_free_ char *p = NULL;
1140         Unit *u = userdata;
1141         int r;
1142
1143         assert(bus);
1144         assert(u);
1145
1146         p = unit_dbus_path(u);
1147         if (!p)
1148                 return -ENOMEM;
1149
1150         r = sd_bus_message_new_signal(
1151                         bus,
1152                         &m,
1153                         "/org/freedesktop/systemd1",
1154                         "org.freedesktop.systemd1.Manager",
1155                         "UnitRemoved");
1156         if (r < 0)
1157                 return r;
1158
1159         r = sd_bus_message_append(m, "so", u->id, p);
1160         if (r < 0)
1161                 return r;
1162
1163         return sd_bus_send(bus, m, NULL);
1164 }
1165
1166 void bus_unit_send_removed_signal(Unit *u) {
1167         int r;
1168         assert(u);
1169
1170         if (!u->sent_dbus_new_signal || u->in_dbus_queue)
1171                 bus_unit_send_change_signal(u);
1172
1173         if (!u->id)
1174                 return;
1175
1176         r = bus_foreach_bus(u->manager, NULL, send_removed_signal, u);
1177         if (r < 0)
1178                 log_unit_debug_errno(u, r, "Failed to send unit remove signal for %s: %m", u->id);
1179 }
1180
1181 int bus_unit_queue_job(
1182                 sd_bus_message *message,
1183                 Unit *u,
1184                 JobType type,
1185                 JobMode mode,
1186                 bool reload_if_possible,
1187                 sd_bus_error *error) {
1188
1189         _cleanup_free_ char *path = NULL;
1190         Job *j;
1191         int r;
1192
1193         assert(message);
1194         assert(u);
1195         assert(type >= 0 && type < _JOB_TYPE_MAX);
1196         assert(mode >= 0 && mode < _JOB_MODE_MAX);
1197
1198         r = mac_selinux_unit_access_check(
1199                         u, message,
1200                         job_type_to_access_method(type),
1201                         error);
1202         if (r < 0)
1203                 return r;
1204
1205         if (reload_if_possible && unit_can_reload(u)) {
1206                 if (type == JOB_RESTART)
1207                         type = JOB_RELOAD_OR_START;
1208                 else if (type == JOB_TRY_RESTART)
1209                         type = JOB_TRY_RELOAD;
1210         }
1211
1212         if (type == JOB_STOP &&
1213             (u->load_state == UNIT_NOT_FOUND || u->load_state == UNIT_ERROR) &&
1214             unit_active_state(u) == UNIT_INACTIVE)
1215                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
1216
1217         if ((type == JOB_START && u->refuse_manual_start) ||
1218             (type == JOB_STOP && u->refuse_manual_stop) ||
1219             ((type == JOB_RESTART || type == JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)) ||
1220             (type == JOB_RELOAD_OR_START && job_type_collapse(type, u) == JOB_START && u->refuse_manual_start))
1221                 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only (it is configured to refuse manual start/stop).", u->id);
1222
1223         r = manager_add_job(u->manager, type, u, mode, error, &j);
1224         if (r < 0)
1225                 return r;
1226
1227         r = bus_job_track_sender(j, message);
1228         if (r < 0)
1229                 return r;
1230
1231         path = job_dbus_path(j);
1232         if (!path)
1233                 return -ENOMEM;
1234
1235         return sd_bus_reply_method_return(message, "o", path);
1236 }
1237
1238 static int bus_unit_set_transient_property(
1239                 Unit *u,
1240                 const char *name,
1241                 sd_bus_message *message,
1242                 UnitSetPropertiesMode mode,
1243                 sd_bus_error *error) {
1244
1245         int r;
1246
1247         assert(u);
1248         assert(name);
1249         assert(message);
1250
1251         if (streq(name, "Description")) {
1252                 const char *d;
1253
1254                 r = sd_bus_message_read(message, "s", &d);
1255                 if (r < 0)
1256                         return r;
1257
1258                 if (mode != UNIT_CHECK) {
1259                         r = unit_set_description(u, d);
1260                         if (r < 0)
1261                                 return r;
1262
1263                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDescription=%s", d);
1264                 }
1265
1266                 return 1;
1267
1268         } else if (streq(name, "DefaultDependencies")) {
1269                 int b;
1270
1271                 r = sd_bus_message_read(message, "b", &b);
1272                 if (r < 0)
1273                         return r;
1274
1275                 if (mode != UNIT_CHECK) {
1276                         u->default_dependencies = b;
1277                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDefaultDependencies=%s", yes_no(b));
1278                 }
1279
1280                 return 1;
1281
1282         } else if (streq(name, "Slice")) {
1283                 Unit *slice;
1284                 const char *s;
1285
1286                 if (!UNIT_HAS_CGROUP_CONTEXT(u))
1287                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "The slice property is only available for units with control groups.");
1288                 if (u->type == UNIT_SLICE)
1289                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Slice may not be set for slice units.");
1290                 if (unit_has_name(u, SPECIAL_INIT_SCOPE))
1291                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Cannot set slice for init.scope");
1292
1293                 r = sd_bus_message_read(message, "s", &s);
1294                 if (r < 0)
1295                         return r;
1296
1297                 if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
1298                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name '%s'", s);
1299
1300                 /* Note that we do not dispatch the load queue here yet, as we don't want our own transient unit to be
1301                  * loaded while we are still setting it up. Or in other words, we use manager_load_unit_prepare()
1302                  * instead of manager_load_unit() on purpose, here. */
1303                 r = manager_load_unit_prepare(u->manager, s, NULL, error, &slice);
1304                 if (r < 0)
1305                         return r;
1306
1307                 if (slice->type != UNIT_SLICE)
1308                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit name '%s' is not a slice", s);
1309
1310                 if (mode != UNIT_CHECK) {
1311                         r = unit_set_slice(u, slice);
1312                         if (r < 0)
1313                                 return r;
1314
1315                         unit_write_drop_in_private_format(u, mode, name, "Slice=%s", s);
1316                 }
1317
1318                 return 1;
1319
1320         } else if (STR_IN_SET(name,
1321                               "Requires", "RequiresOverridable",
1322                               "Requisite", "RequisiteOverridable",
1323                               "Wants",
1324                               "BindsTo",
1325                               "Conflicts",
1326                               "Before", "After",
1327                               "OnFailure",
1328                               "PropagatesReloadTo", "ReloadPropagatedFrom",
1329                               "PartOf")) {
1330
1331                 UnitDependency d;
1332                 const char *other;
1333
1334                 if (streq(name, "RequiresOverridable"))
1335                         d = UNIT_REQUIRES; /* redirect for obsolete unit dependency type */
1336                 else if (streq(name, "RequisiteOverridable"))
1337                         d = UNIT_REQUISITE; /* same here */
1338                 else {
1339                         d = unit_dependency_from_string(name);
1340                         if (d < 0)
1341                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit dependency: %s", name);
1342                 }
1343
1344                 r = sd_bus_message_enter_container(message, 'a', "s");
1345                 if (r < 0)
1346                         return r;
1347
1348                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
1349                         if (!unit_name_is_valid(other, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
1350                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
1351
1352                         if (mode != UNIT_CHECK) {
1353                                 _cleanup_free_ char *label = NULL;
1354
1355                                 r = unit_add_dependency_by_name(u, d, other, NULL, true);
1356                                 if (r < 0)
1357                                         return r;
1358
1359                                 label = strjoin(name, "-", other);
1360                                 if (!label)
1361                                         return -ENOMEM;
1362
1363                                 unit_write_drop_in_format(u, mode, label, "[Unit]\n%s=%s", name, other);
1364                         }
1365
1366                 }
1367                 if (r < 0)
1368                         return r;
1369
1370                 r = sd_bus_message_exit_container(message);
1371                 if (r < 0)
1372                         return r;
1373
1374                 return 1;
1375
1376         } else if (streq(name, "AddRef")) {
1377
1378                 int b;
1379
1380                 /* Why is this called "AddRef" rather than just "Ref", or "Reference"? There's already a "Ref()" method
1381                  * on the Unit interface, and it's probably not a good idea to expose a property and a method on the
1382                  * same interface (well, strictly speaking AddRef isn't exposed as full property, we just read it for
1383                  * transient units, but still). And "References" and "ReferencedBy" is already used as unit reference
1384                  * dependency type, hence let's not confuse things with that.
1385                  *
1386                  * Note that we don't acually add the reference to the bus track. We do that only after the setup of
1387                  * the transient unit is complete, so that setting this property multiple times in the same transient
1388                  * unit creation call doesn't count as individual references. */
1389
1390                 r = sd_bus_message_read(message, "b", &b);
1391                 if (r < 0)
1392                         return r;
1393
1394                 if (mode != UNIT_CHECK)
1395                         u->bus_track_add = b;
1396
1397                 return 1;
1398         }
1399
1400         return 0;
1401 }
1402
1403 int bus_unit_set_properties(
1404                 Unit *u,
1405                 sd_bus_message *message,
1406                 UnitSetPropertiesMode mode,
1407                 bool commit,
1408                 sd_bus_error *error) {
1409
1410         bool for_real = false;
1411         unsigned n = 0;
1412         int r;
1413
1414         assert(u);
1415         assert(message);
1416
1417         /* We iterate through the array twice. First run we just check
1418          * if all passed data is valid, second run actually applies
1419          * it. This is to implement transaction-like behaviour without
1420          * actually providing full transactions. */
1421
1422         r = sd_bus_message_enter_container(message, 'a', "(sv)");
1423         if (r < 0)
1424                 return r;
1425
1426         for (;;) {
1427                 const char *name;
1428
1429                 r = sd_bus_message_enter_container(message, 'r', "sv");
1430                 if (r < 0)
1431                         return r;
1432                 if (r == 0) {
1433                         if (for_real || mode == UNIT_CHECK)
1434                                 break;
1435
1436                         /* Reached EOF. Let's try again, and this time for realz... */
1437                         r = sd_bus_message_rewind(message, false);
1438                         if (r < 0)
1439                                 return r;
1440
1441                         for_real = true;
1442                         continue;
1443                 }
1444
1445                 r = sd_bus_message_read(message, "s", &name);
1446                 if (r < 0)
1447                         return r;
1448
1449                 if (!UNIT_VTABLE(u)->bus_set_property)
1450                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
1451
1452                 r = sd_bus_message_enter_container(message, 'v', NULL);
1453                 if (r < 0)
1454                         return r;
1455
1456                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
1457                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
1458                         r = bus_unit_set_transient_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
1459                 if (r < 0)
1460                         return r;
1461                 if (r == 0)
1462                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
1463
1464                 r = sd_bus_message_exit_container(message);
1465                 if (r < 0)
1466                         return r;
1467
1468                 r = sd_bus_message_exit_container(message);
1469                 if (r < 0)
1470                         return r;
1471
1472                 n += for_real;
1473         }
1474
1475         r = sd_bus_message_exit_container(message);
1476         if (r < 0)
1477                 return r;
1478
1479         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
1480                 UNIT_VTABLE(u)->bus_commit_properties(u);
1481
1482         return n;
1483 }
1484
1485 int bus_unit_check_load_state(Unit *u, sd_bus_error *error) {
1486         assert(u);
1487
1488         if (u->load_state == UNIT_LOADED)
1489                 return 0;
1490
1491         /* Give a better description of the unit error when
1492          * possible. Note that in the case of UNIT_MASKED, load_error
1493          * is not set. */
1494         if (u->load_state == UNIT_MASKED)
1495                 return sd_bus_error_setf(error, BUS_ERROR_UNIT_MASKED, "Unit %s is masked.", u->id);
1496
1497         if (u->load_state == UNIT_NOT_FOUND)
1498                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not found.", u->id);
1499
1500         return sd_bus_error_set_errnof(error, u->load_error, "Unit %s is not loaded properly: %m.", u->id);
1501 }
1502
1503 static int bus_unit_track_handler(sd_bus_track *t, void *userdata) {
1504         Unit *u = userdata;
1505
1506         assert(t);
1507         assert(u);
1508
1509         u->bus_track = sd_bus_track_unref(u->bus_track); /* make sure we aren't called again */
1510
1511         unit_add_to_gc_queue(u);
1512         return 0;
1513 }
1514
1515 static int bus_unit_allocate_bus_track(Unit *u) {
1516         int r;
1517
1518         assert(u);
1519
1520         if (u->bus_track)
1521                 return 0;
1522
1523         r = sd_bus_track_new(u->manager->api_bus, &u->bus_track, bus_unit_track_handler, u);
1524         if (r < 0)
1525                 return r;
1526
1527         r = sd_bus_track_set_recursive(u->bus_track, true);
1528         if (r < 0) {
1529                 u->bus_track = sd_bus_track_unref(u->bus_track);
1530                 return r;
1531         }
1532
1533         return 0;
1534 }
1535
1536 int bus_unit_track_add_name(Unit *u, const char *name) {
1537         int r;
1538
1539         assert(u);
1540
1541         r = bus_unit_allocate_bus_track(u);
1542         if (r < 0)
1543                 return r;
1544
1545         return sd_bus_track_add_name(u->bus_track, name);
1546 }
1547
1548 int bus_unit_track_add_sender(Unit *u, sd_bus_message *m) {
1549         int r;
1550
1551         assert(u);
1552
1553         r = bus_unit_allocate_bus_track(u);
1554         if (r < 0)
1555                 return r;
1556
1557         return sd_bus_track_add_sender(u->bus_track, m);
1558 }
1559
1560 int bus_unit_track_remove_sender(Unit *u, sd_bus_message *m) {
1561         assert(u);
1562
1563         /* If we haven't allocated the bus track object yet, then there's definitely no reference taken yet, return an
1564          * error */
1565         if (!u->bus_track)
1566                 return -EUNATCH;
1567
1568         return sd_bus_track_remove_sender(u->bus_track, m);
1569 }