src/core/dbus-unit.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include "sd-bus.h"
  23 #include "log.h"
  24 #include "selinux-access.h"
  25 #include "cgroup-util.h"
  26 #include "strv.h"
  27 #include "path-util.h"
  28 #include "fileio.h"
  29 #include "dbus-unit.h"
  30 #include "dbus-manager.h"
  31 #include "bus-errors.h"
  32 #include "dbus-client-track.h"
  33
  34 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_load_state, unit_load_state, UnitLoadState);
  35 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_job_mode, job_mode, JobMode);
  36
  37 static int property_get_names(
  38                 sd_bus *bus,
  39                 const char *path,
  40                 const char *interface,
  41                 const char *property,
  42                 sd_bus_message *reply,
  43                 void *userdata,
  44                 sd_bus_error *error) {
  45
  46         Unit *u = userdata;
  47         Iterator i;
  48         const char *t;
  49         int r;
  50
  51         assert(bus);
  52         assert(reply);
  53         assert(u);
  54
  55         r = sd_bus_message_open_container(reply, 'a', "s");
  56         if (r < 0)
  57                 return r;
  58
  59         SET_FOREACH(t, u->names, i) {
  60                 r = sd_bus_message_append(reply, "s", t);
  61                 if (r < 0)
  62                         return r;
  63         }
  64
  65         return sd_bus_message_close_container(reply);
  66 }
  67
  68 static int property_get_following(
  69                 sd_bus *bus,
  70                 const char *path,
  71                 const char *interface,
  72                 const char *property,
  73                 sd_bus_message *reply,
  74                 void *userdata,
  75                 sd_bus_error *error) {
  76
  77         Unit *u = userdata, *f;
  78
  79         assert(bus);
  80         assert(reply);
  81         assert(u);
  82
  83         f = unit_following(u);
  84         return sd_bus_message_append(reply, "s", f ? f->id : "");
  85 }
  86
  87 static int property_get_dependencies(
  88                 sd_bus *bus,
  89                 const char *path,
  90                 const char *interface,
  91                 const char *property,
  92                 sd_bus_message *reply,
  93                 void *userdata,
  94                 sd_bus_error *error) {
  95
  96         Set *s = *(Set**) userdata;
  97         Iterator j;
  98         Unit *u;
  99         int r;
 100
 101         assert(bus);
 102         assert(reply);
 103
 104         r = sd_bus_message_open_container(reply, 'a', "s");
 105         if (r < 0)
 106                 return r;
 107
 108         SET_FOREACH(u, s, j) {
 109                 r = sd_bus_message_append(reply, "s", u->id);
 110                 if (r < 0)
 111                         return r;
 112         }
 113
 114         return sd_bus_message_close_container(reply);
 115 }
 116
 117 static int property_get_description(
 118                 sd_bus *bus,
 119                 const char *path,
 120                 const char *interface,
 121                 const char *property,
 122                 sd_bus_message *reply,
 123                 void *userdata,
 124                 sd_bus_error *error) {
 125
 126         Unit *u = userdata;
 127
 128         assert(bus);
 129         assert(reply);
 130         assert(u);
 131
 132         return sd_bus_message_append(reply, "s", unit_description(u));
 133 }
 134
 135 static int property_get_active_state(
 136                 sd_bus *bus,
 137                 const char *path,
 138                 const char *interface,
 139                 const char *property,
 140                 sd_bus_message *reply,
 141                 void *userdata,
 142                 sd_bus_error *error) {
 143
 144         Unit *u = userdata;
 145
 146         assert(bus);
 147         assert(reply);
 148         assert(u);
 149
 150         return sd_bus_message_append(reply, "s", unit_active_state_to_string(unit_active_state(u)));
 151 }
 152
 153 static int property_get_sub_state(
 154                 sd_bus *bus,
 155                 const char *path,
 156                 const char *interface,
 157                 const char *property,
 158                 sd_bus_message *reply,
 159                 void *userdata,
 160                 sd_bus_error *error) {
 161
 162         Unit *u = userdata;
 163
 164         assert(bus);
 165         assert(reply);
 166         assert(u);
 167
 168         return sd_bus_message_append(reply, "s", unit_sub_state_to_string(u));
 169 }
 170
 171 static int property_get_unit_file_state(
 172                 sd_bus *bus,
 173                 const char *path,
 174                 const char *interface,
 175                 const char *property,
 176                 sd_bus_message *reply,
 177                 void *userdata,
 178                 sd_bus_error *error) {
 179
 180         Unit *u = userdata;
 181
 182         assert(bus);
 183         assert(reply);
 184         assert(u);
 185
 186         return sd_bus_message_append(reply, "s", unit_file_state_to_string(unit_get_unit_file_state(u)));
 187 }
 188
 189 static int property_get_can_start(
 190                 sd_bus *bus,
 191                 const char *path,
 192                 const char *interface,
 193                 const char *property,
 194                 sd_bus_message *reply,
 195                 void *userdata,
 196                 sd_bus_error *error) {
 197
 198         Unit *u = userdata;
 199
 200         assert(bus);
 201         assert(reply);
 202         assert(u);
 203
 204         return sd_bus_message_append(reply, "b", unit_can_start(u) && !u->refuse_manual_start);
 205 }
 206
 207 static int property_get_can_stop(
 208                 sd_bus *bus,
 209                 const char *path,
 210                 const char *interface,
 211                 const char *property,
 212                 sd_bus_message *reply,
 213                 void *userdata,
 214                 sd_bus_error *error) {
 215
 216         Unit *u = userdata;
 217
 218         assert(bus);
 219         assert(reply);
 220         assert(u);
 221
 222         /* On the lower levels we assume that every unit we can start
 223          * we can also stop */
 224
 225         return sd_bus_message_append(reply, "b", unit_can_start(u) && !u->refuse_manual_stop);
 226 }
 227
 228 static int property_get_can_reload(
 229                 sd_bus *bus,
 230                 const char *path,
 231                 const char *interface,
 232                 const char *property,
 233                 sd_bus_message *reply,
 234                 void *userdata,
 235                 sd_bus_error *error) {
 236
 237         Unit *u = userdata;
 238
 239         assert(bus);
 240         assert(reply);
 241         assert(u);
 242
 243         return sd_bus_message_append(reply, "b", unit_can_reload(u));
 244 }
 245
 246 static int property_get_can_isolate(
 247                 sd_bus *bus,
 248                 const char *path,
 249                 const char *interface,
 250                 const char *property,
 251                 sd_bus_message *reply,
 252                 void *userdata,
 253                 sd_bus_error *error) {
 254
 255         Unit *u = userdata;
 256
 257         assert(bus);
 258         assert(reply);
 259         assert(u);
 260
 261         return sd_bus_message_append(reply, "b", unit_can_isolate(u) && !u->refuse_manual_start);
 262 }
 263
 264 static int property_get_job(
 265                 sd_bus *bus,
 266                 const char *path,
 267                 const char *interface,
 268                 const char *property,
 269                 sd_bus_message *reply,
 270                 void *userdata,
 271                 sd_bus_error *error) {
 272
 273         _cleanup_free_ char *p = NULL;
 274         Unit *u = userdata;
 275
 276         assert(bus);
 277         assert(reply);
 278         assert(u);
 279
 280         if (!u->job)
 281                 return sd_bus_message_append(reply, "(uo)", 0, "/");
 282
 283         p = job_dbus_path(u->job);
 284         if (!p)
 285                 return -ENOMEM;
 286
 287         return sd_bus_message_append(reply, "(uo)", u->job->id, p);
 288 }
 289
 290 static int property_get_need_daemon_reload(
 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_need_daemon_reload(u));
 306 }
 307
 308 static int property_get_conditions(
 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         Unit *u = userdata;
 318         Condition *c;
 319         int r;
 320
 321         assert(bus);
 322         assert(reply);
 323         assert(u);
 324
 325         r = sd_bus_message_open_container(reply, 'a', "(sbbsi)");
 326         if (r < 0)
 327                 return r;
 328
 329         LIST_FOREACH(conditions, c, u->conditions) {
 330                 r = sd_bus_message_append(reply, "(sbbsi)",
 331                                           condition_type_to_string(c->type),
 332                                           c->trigger, c->negate,
 333                                           c->parameter, c->state);
 334                 if (r < 0)
 335                         return r;
 336
 337         }
 338
 339         return sd_bus_message_close_container(reply);
 340 }
 341
 342 static int property_get_load_error(
 343                 sd_bus *bus,
 344                 const char *path,
 345                 const char *interface,
 346                 const char *property,
 347                 sd_bus_message *reply,
 348                 void *userdata,
 349                 sd_bus_error *error) {
 350
 351         _cleanup_bus_error_free_ sd_bus_error e = SD_BUS_ERROR_NULL;
 352         Unit *u = userdata;
 353
 354         assert(bus);
 355         assert(reply);
 356         assert(u);
 357
 358         if (u->load_error != 0)
 359                 sd_bus_error_set_errno(&e, u->load_error);
 360
 361         return sd_bus_message_append(reply, "(ss)", e.name, e.message);
 362 }
 363
 364 int bus_unit_method_start_generic(sd_bus *bus, sd_bus_message *message, Unit *u, JobType job_type, bool reload_if_possible, sd_bus_error *error) {
 365         const char *smode;
 366         JobMode mode;
 367         int r;
 368
 369         assert(bus);
 370         assert(message);
 371         assert(u);
 372         assert(job_type >= 0 && job_type < _JOB_TYPE_MAX);
 373
 374         r = sd_bus_message_read(message, "s", &smode);
 375         if (r < 0)
 376                 return r;
 377
 378         mode = job_mode_from_string(smode);
 379         if (mode < 0)
 380                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s invalid", smode);
 381
 382         return bus_unit_queue_job(bus, message, u, job_type, mode, reload_if_possible, error);
 383 }
 384
 385 static int method_start(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 386         return bus_unit_method_start_generic(bus, message, userdata, JOB_START, false, error);
 387 }
 388
 389 static int method_stop(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 390         return bus_unit_method_start_generic(bus, message, userdata, JOB_STOP, false, error);
 391 }
 392
 393 static int method_reload(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 394         return bus_unit_method_start_generic(bus, message, userdata, JOB_RELOAD, false, error);
 395 }
 396
 397 static int method_restart(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 398         return bus_unit_method_start_generic(bus, message, userdata, JOB_RESTART, false, error);
 399 }
 400
 401 static int method_try_restart(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 402         return bus_unit_method_start_generic(bus, message, userdata, JOB_TRY_RESTART, false, error);
 403 }
 404
 405 static int method_reload_or_restart(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 406         return bus_unit_method_start_generic(bus, message, userdata, JOB_RESTART, true, error);
 407 }
 408
 409 static int method_reload_or_try_restart(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 410         return bus_unit_method_start_generic(bus, message, userdata, JOB_TRY_RESTART, true, error);
 411 }
 412
 413 int bus_unit_method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 414         Unit *u = userdata;
 415         const char *swho;
 416         int32_t signo;
 417         KillWho who;
 418         int r;
 419
 420         assert(bus);
 421         assert(message);
 422         assert(u);
 423
 424         r = sd_bus_message_read(message, "si", &swho, &signo);
 425         if (r < 0)
 426                 return r;
 427
 428         if (isempty(swho))
 429                 who = KILL_ALL;
 430         else {
 431                 who = kill_who_from_string(swho);
 432                 if (who < 0)
 433                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid who argument %s", swho);
 434         }
 435
 436         if (signo <= 0 || signo >= _NSIG)
 437                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Signal number out of range.");
 438
 439         r = selinux_unit_access_check(u, bus, message, "stop", error);
 440         if (r < 0)
 441                 return r;
 442
 443         r = unit_kill(u, who, signo, error);
 444         if (r < 0)
 445                 return r;
 446
 447         return sd_bus_reply_method_return(message, NULL);
 448 }
 449
 450 int bus_unit_method_reset_failed(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 451         Unit *u = userdata;
 452         int r;
 453
 454         assert(bus);
 455         assert(message);
 456         assert(u);
 457
 458         r = selinux_unit_access_check(u, bus, message, "reload", error);
 459         if (r < 0)
 460                 return r;
 461
 462         unit_reset_failed(u);
 463
 464         return sd_bus_reply_method_return(message, NULL);
 465 }
 466
 467 int bus_unit_method_set_properties(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
 468         Unit *u = userdata;
 469         int runtime, r;
 470
 471         assert(bus);
 472         assert(message);
 473         assert(u);
 474
 475         r = sd_bus_message_read(message, "b", &runtime);
 476         if (r < 0)
 477                 return r;
 478
 479         r = selinux_unit_access_check(u, bus, message, "start", error);
 480         if (r < 0)
 481                 return r;
 482
 483         r = bus_unit_set_properties(u, message, runtime ? UNIT_RUNTIME : UNIT_PERSISTENT, true, error);
 484         if (r < 0)
 485                 return r;
 486
 487         return sd_bus_reply_method_return(message, NULL);
 488 }
 489
 490 const sd_bus_vtable bus_unit_vtable[] = {
 491         SD_BUS_VTABLE_START(0),
 492
 493         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Unit, id), 0),
 494         SD_BUS_PROPERTY("Names", "as", property_get_names, 0, 0),
 495         SD_BUS_PROPERTY("Following", "s", property_get_following, 0, 0),
 496         SD_BUS_PROPERTY("Requires", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES]), 0),
 497         SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES_OVERRIDABLE]), 0),
 498         SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), 0),
 499         SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OVERRIDABLE]), 0),
 500         SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), 0),
 501         SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), 0),
 502         SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), 0),
 503         SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), 0),
 504         SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY_OVERRIDABLE]), 0),
 505         SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), 0),
 506         SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), 0),
 507         SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), 0),
 508         SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), 0),
 509         SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), 0),
 510         SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), 0),
 511         SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), 0),
 512         SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), 0),
 513         SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), 0),
 514         SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), 0),
 515         SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), 0),
 516         SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), 0),
 517         SD_BUS_PROPERTY("JoinsNamespaceOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_JOINS_NAMESPACE_OF]), 0),
 518         SD_BUS_PROPERTY("RequiresMountsFor", "as", NULL, offsetof(Unit, requires_mounts_for), 0),
 519         SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), 0),
 520         SD_BUS_PROPERTY("Description", "s", property_get_description, 0, 0),
 521         SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), 0),
 522         SD_BUS_PROPERTY("ActiveState", "s", property_get_active_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 523         SD_BUS_PROPERTY("SubState", "s", property_get_sub_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 524         SD_BUS_PROPERTY("FragmentPath", "s", NULL, offsetof(Unit, fragment_path), 0),
 525         SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), 0),
 526         SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), 0),
 527         SD_BUS_PROPERTY("UnitFileState", "s", property_get_unit_file_state, 0, 0),
 528         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveExitTimestamp", offsetof(Unit, inactive_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 529         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveEnterTimestamp", offsetof(Unit, active_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 530         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveExitTimestamp", offsetof(Unit, active_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 531         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveEnterTimestamp", offsetof(Unit, inactive_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 532         SD_BUS_PROPERTY("CanStart", "b", property_get_can_start, 0, 0),
 533         SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, 0),
 534         SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, 0),
 535         SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, 0),
 536         SD_BUS_PROPERTY("Job", "(uo)", property_get_job, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 537         SD_BUS_PROPERTY("StopWhenUnneeded", "b", bus_property_get_bool, offsetof(Unit, stop_when_unneeded), 0),
 538         SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), 0),
 539         SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), 0),
 540         SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), 0),
 541         SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), 0),
 542         SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), 0),
 543         SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), 0),
 544         SD_BUS_PROPERTY("IgnoreOnSnapshot", "b", bus_property_get_bool, offsetof(Unit, ignore_on_snapshot), 0),
 545         SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, 0),
 546         SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), 0),
 547         SD_BUS_PROPERTY("ConditionResult", "b", bus_property_get_bool, offsetof(Unit, condition_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 548         BUS_PROPERTY_DUAL_TIMESTAMP("ConditionTimestamp", offsetof(Unit, condition_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 549         SD_BUS_PROPERTY("Conditions", "a(sbbsi)", property_get_conditions, 0, 0),
 550         SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, 0),
 551         SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), 0),
 552
 553         SD_BUS_METHOD("Start", "s", "o", method_start, 0),
 554         SD_BUS_METHOD("Stop", "s", "o", method_stop, 0),
 555         SD_BUS_METHOD("Reload", "s", "o", method_reload, 0),
 556         SD_BUS_METHOD("Restart", "s", "o", method_restart, 0),
 557         SD_BUS_METHOD("TryRestart", "s", "o", method_try_restart, 0),
 558         SD_BUS_METHOD("ReloadOrRestart", "s", "o", method_reload_or_restart, 0),
 559         SD_BUS_METHOD("ReloadOrTryRestart", "s", "o", method_reload_or_try_restart, 0),
 560         SD_BUS_METHOD("Kill", "si", NULL, bus_unit_method_kill, 0),
 561         SD_BUS_METHOD("ResetFailed", NULL, NULL, bus_unit_method_reset_failed, 0),
 562         SD_BUS_METHOD("SetProperties", "ba(sv)", NULL, bus_unit_method_set_properties, 0),
 563
 564         SD_BUS_VTABLE_END
 565 };
 566
 567 static int property_get_slice(
 568                 sd_bus *bus,
 569                 const char *path,
 570                 const char *interface,
 571                 const char *property,
 572                 sd_bus_message *reply,
 573                 void *userdata,
 574                 sd_bus_error *error) {
 575
 576         Unit *u = userdata;
 577
 578         assert(bus);
 579         assert(reply);
 580         assert(u);
 581
 582         return sd_bus_message_append(reply, "s", unit_slice_name(u));
 583 }
 584
 585 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
 586         SD_BUS_VTABLE_START(0),
 587         SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
 588         SD_BUS_PROPERTY("ControlGroup", "s", NULL, offsetof(Unit, cgroup_path), 0),
 589         SD_BUS_VTABLE_END
 590 };
 591
 592 static int send_new_signal(sd_bus *bus, const char *destination, void *userdata) {
 593         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 594         _cleanup_free_ char *p = NULL;
 595         Unit *u = userdata;
 596         int r;
 597
 598         assert(bus);
 599         assert(u);
 600
 601         p = unit_dbus_path(u);
 602         if (!u)
 603                 return -ENOMEM;
 604
 605         r = sd_bus_message_new_signal(
 606                         bus,
 607                         "/org/freedesktop/systemd1",
 608                         "org.freedesktop.systemd1.Manager",
 609                         "UnitNew",
 610                         &m);
 611         if (r < 0)
 612                 return r;
 613
 614         r = sd_bus_message_append(m, "so", u->id, p);
 615         if (r < 0)
 616                 return r;
 617
 618         return sd_bus_send_to(bus, m, destination, NULL);
 619 }
 620
 621 static int send_changed_signal(sd_bus *bus, const char *destination, void *userdata) {
 622         _cleanup_free_ char *p = NULL;
 623         Unit *u = userdata;
 624         int r;
 625
 626         assert(bus);
 627         assert(u);
 628
 629         p = unit_dbus_path(u);
 630         if (!u)
 631                 return -ENOMEM;
 632
 633         /* Send a properties changed signal. First for the specific
 634          * type, then for the generic unit. The clients may rely on
 635          * this order to get atomic behavior if needed. */
 636
 637         if (UNIT_VTABLE(u)->bus_changing_properties) {
 638
 639                 r = sd_bus_emit_properties_changed_strv(
 640                                 bus, p,
 641                                 UNIT_VTABLE(u)->bus_interface,
 642                                 (char**) UNIT_VTABLE(u)->bus_changing_properties);
 643                 if (r < 0)
 644                         return r;
 645         }
 646
 647         return sd_bus_emit_properties_changed(
 648                         bus, p,
 649                         "org.freedesktop.systemd1.Unit",
 650                         "ActiveState",
 651                         "SubState",
 652                         "InactiveExitTimestamp",
 653                         "ActiveEnterTimestamp",
 654                         "ActiveExitTimestamp",
 655                         "InactiveEnterTimestamp",
 656                         "Job",
 657                         "ConditionResult",
 658                         "ConditionTimestamp",
 659                         NULL);
 660 }
 661
 662 void bus_unit_send_change_signal(Unit *u) {
 663         int r;
 664         assert(u);
 665
 666         if (u->in_dbus_queue) {
 667                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
 668                 u->in_dbus_queue = false;
 669         }
 670
 671         if (!u->id)
 672                 return;
 673
 674         r = bus_manager_foreach_client(u->manager, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
 675         if (r < 0)
 676                 log_debug("Failed to send unit change signal for %s: %s", u->id, strerror(-r));
 677
 678         u->sent_dbus_new_signal = true;
 679 }
 680
 681 static int send_removed_signal(sd_bus *bus, const char *destination, void *userdata) {
 682         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 683         _cleanup_free_ char *p = NULL;
 684         Unit *u = userdata;
 685         int r;
 686
 687         assert(bus);
 688         assert(u);
 689
 690         p = unit_dbus_path(u);
 691         if (!u)
 692                 return -ENOMEM;
 693
 694         r = sd_bus_message_new_signal(
 695                         bus,
 696                         "/org/freedesktop/systemd1",
 697                         "org.freedesktop.systemd1.Manager",
 698                         "UnitRemoved",
 699                         &m);
 700         if (r < 0)
 701                 return r;
 702
 703         r = sd_bus_message_append(m, "so", u->id, p);
 704         if (r < 0)
 705                 return r;
 706
 707         return sd_bus_send_to(bus, m, destination, NULL);
 708 }
 709
 710 void bus_unit_send_removed_signal(Unit *u) {
 711         int r;
 712         assert(u);
 713
 714         if (!u->sent_dbus_new_signal)
 715                 bus_unit_send_change_signal(u);
 716
 717         if (!u->id)
 718                 return;
 719
 720         r = bus_manager_foreach_client(u->manager, send_removed_signal, u);
 721         if (r < 0)
 722                 log_debug("Failed to send unit remove signal for %s: %s", u->id, strerror(-r));
 723 }
 724
 725 int bus_unit_queue_job(
 726                 sd_bus *bus,
 727                 sd_bus_message *message,
 728                 Unit *u,
 729                 JobType type,
 730                 JobMode mode,
 731                 bool reload_if_possible,
 732                 sd_bus_error *error) {
 733
 734         _cleanup_free_ char *path = NULL;
 735         Job *j;
 736         int r;
 737
 738         assert(bus);
 739         assert(message);
 740         assert(u);
 741         assert(type >= 0 && type < _JOB_TYPE_MAX);
 742         assert(mode >= 0 && mode < _JOB_MODE_MAX);
 743
 744         if (reload_if_possible && unit_can_reload(u)) {
 745                 if (type == JOB_RESTART)
 746                         type = JOB_RELOAD_OR_START;
 747                 else if (type == JOB_TRY_RESTART)
 748                         type = JOB_RELOAD;
 749         }
 750
 751         r = selinux_unit_access_check(
 752                         u, bus, message,
 753                         (type == JOB_START || type == JOB_RESTART || type == JOB_TRY_RESTART) ? "start" :
 754                         type == JOB_STOP ? "stop" : "reload", error);
 755         if (r < 0)
 756                 return r;
 757
 758         if (type == JOB_STOP &&
 759             (u->load_state == UNIT_NOT_FOUND || u->load_state == UNIT_ERROR) &&
 760             unit_active_state(u) == UNIT_INACTIVE)
 761                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
 762
 763         if ((type == JOB_START && u->refuse_manual_start) ||
 764             (type == JOB_STOP && u->refuse_manual_stop) ||
 765             ((type == JOB_RESTART || type == JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)))
 766                 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only.", u->id);
 767
 768         r = manager_add_job(u->manager, type, u, mode, true, error, &j);
 769         if (r < 0)
 770                 return r;
 771
 772         r = bus_client_track(&j->subscribed, bus, sd_bus_message_get_sender(message));
 773         if (r < 0)
 774                 return r;
 775
 776         path = job_dbus_path(j);
 777         if (!path)
 778                 return -ENOMEM;
 779
 780         return sd_bus_reply_method_return(message, "o", path);
 781 }
 782
 783 static int bus_unit_set_transient_property(
 784                 Unit *u,
 785                 const char *name,
 786                 sd_bus_message *message,
 787                 UnitSetPropertiesMode mode,
 788                 sd_bus_error *error) {
 789
 790         int r;
 791
 792         assert(u);
 793         assert(name);
 794         assert(message);
 795
 796         if (streq(name, "Description")) {
 797                 const char *d;
 798
 799                 r = sd_bus_message_read(message, "s", &d);
 800                 if (r < 0)
 801                         return r;
 802
 803                 if (mode != UNIT_CHECK) {
 804                         r = unit_set_description(u, d);
 805                         if (r < 0)
 806                                 return r;
 807
 808                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDescription=%s\n", d);
 809                 }
 810
 811                 return 1;
 812
 813         } else if (streq(name, "Slice") && unit_get_cgroup_context(u)) {
 814                 const char *s;
 815
 816                 r = sd_bus_message_read(message, "s", &s);
 817                 if (r < 0)
 818                         return r;
 819
 820                 if (!unit_name_is_valid(s, false) || !endswith(s, ".slice"))
 821                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid slice name %s", s);
 822
 823                 if (isempty(s)) {
 824                         if (mode != UNIT_CHECK) {
 825                                 unit_ref_unset(&u->slice);
 826                                 unit_remove_drop_in(u, mode, name);
 827                         }
 828                 } else {
 829                         Unit *slice;
 830
 831                         r = manager_load_unit(u->manager, s, NULL, error, &slice);
 832                         if (r < 0)
 833                                 return r;
 834
 835                         if (slice->type != UNIT_SLICE)
 836                                 return -EINVAL;
 837
 838                         if (mode != UNIT_CHECK) {
 839                                 unit_ref_set(&u->slice, slice);
 840                                 unit_write_drop_in_private_format(u, mode, name, "Slice=%s\n", s);
 841                         }
 842                 }
 843
 844                 return 1;
 845
 846         } else if (streq(name, "Requires") ||
 847                    streq(name, "RequiresOverridable") ||
 848                    streq(name, "Requisite") ||
 849                    streq(name, "RequisiteOverridable") ||
 850                    streq(name, "Wants") ||
 851                    streq(name, "BindsTo") ||
 852                    streq(name, "Conflicts") ||
 853                    streq(name, "Before") ||
 854                    streq(name, "After") ||
 855                    streq(name, "OnFailure") ||
 856                    streq(name, "PropagatesReloadTo") ||
 857                    streq(name, "ReloadPropagatedFrom") ||
 858                    streq(name, "PartOf")) {
 859
 860                 UnitDependency d;
 861                 const char *other;
 862
 863                 d = unit_dependency_from_string(name);
 864                 if (d < 0)
 865                         return -EINVAL;
 866
 867                 r = sd_bus_message_enter_container(message, 'a', "s");
 868                 if (r < 0)
 869                         return r;
 870
 871                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
 872                         if (!unit_name_is_valid(other, false))
 873                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
 874
 875                         if (mode != UNIT_CHECK) {
 876                                 _cleanup_free_ char *label = NULL;
 877
 878                                 r = unit_add_dependency_by_name(u, d, other, NULL, true);
 879                                 if (r < 0)
 880                                         return r;
 881
 882                                 label = strjoin(name, "-", other, NULL);
 883                                 if (!label)
 884                                         return -ENOMEM;
 885
 886                                 unit_write_drop_in_format(u, mode, label, "[Unit]\n%s=%s\n", name, other);
 887                         }
 888
 889                 }
 890                 if (r < 0)
 891                         return r;
 892
 893                 r = sd_bus_message_exit_container(message);
 894                 if (r < 0)
 895                         return r;
 896
 897                 return 1;
 898         }
 899
 900         return 0;
 901 }
 902
 903 int bus_unit_set_properties(
 904                 Unit *u,
 905                 sd_bus_message *message,
 906                 UnitSetPropertiesMode mode,
 907                 bool commit,
 908                 sd_bus_error *error) {
 909
 910         bool for_real = false;
 911         unsigned n = 0;
 912         int r;
 913
 914         assert(u);
 915         assert(message);
 916
 917         if (u->transient)
 918                 mode &= UNIT_RUNTIME;
 919
 920         /* We iterate through the array twice. First run we just check
 921          * if all passed data is valid, second run actually applies
 922          * it. This is to implement transaction-like behaviour without
 923          * actually providing full transactions. */
 924
 925         r = sd_bus_message_enter_container(message, 'a', "(sv)");
 926         if (r < 0)
 927                 return r;
 928
 929         for (;;) {
 930                 const char *name;
 931
 932                 r = sd_bus_message_enter_container(message, 'r', "sv");
 933                 if (r < 0)
 934                         return r;
 935                 if (r == 0) {
 936                         if (for_real || mode == UNIT_CHECK)
 937                                 break;
 938
 939                         /* Reached EOF. Let's try again, and this time for realz... */
 940                         r = sd_bus_message_rewind(message, false);
 941                         if (r < 0)
 942                                 return r;
 943
 944                         for_real = true;
 945                         continue;
 946                 }
 947
 948                 r = sd_bus_message_read(message, "s", &name);
 949                 if (r < 0)
 950                         return r;
 951
 952                 if (!UNIT_VTABLE(u)->bus_set_property)
 953                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
 954
 955                 r = sd_bus_message_enter_container(message, 'v', NULL);
 956                 if (r < 0)
 957                         return r;
 958
 959                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
 960                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
 961                         r = bus_unit_set_transient_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
 962                 if (r < 0)
 963                         return r;
 964                 if (r == 0)
 965                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
 966
 967                 r = sd_bus_message_exit_container(message);
 968                 if (r < 0)
 969                         return r;
 970
 971                 r = sd_bus_message_exit_container(message);
 972                 if (r < 0)
 973                         return r;
 974
 975                 n += for_real;
 976         }
 977
 978         r = sd_bus_message_exit_container(message);
 979         if (r < 0)
 980                 return r;
 981
 982         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
 983                 UNIT_VTABLE(u)->bus_commit_properties(u);
 984
 985         return n;
 986 }