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 = sd_bus_message_enter_container(message, 'a', "(sv)");
 484         if (r < 0)
 485                 return r;
 486
 487         r = bus_unit_set_properties(u, message, runtime ? UNIT_RUNTIME : UNIT_PERSISTENT, true, error);
 488         if (r < 0)
 489                 return r;
 490
 491         r = sd_bus_message_exit_container(message);
 492         if (r < 0)
 493                 return r;
 494
 495         return sd_bus_reply_method_return(message, NULL);
 496 }
 497
 498 const sd_bus_vtable bus_unit_vtable[] = {
 499         SD_BUS_VTABLE_START(0),
 500
 501         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Unit, id), 0),
 502         SD_BUS_PROPERTY("Names", "as", property_get_names, 0, 0),
 503         SD_BUS_PROPERTY("Following", "s", property_get_following, 0, 0),
 504         SD_BUS_PROPERTY("Requires", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES]), 0),
 505         SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES_OVERRIDABLE]), 0),
 506         SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), 0),
 507         SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OVERRIDABLE]), 0),
 508         SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), 0),
 509         SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), 0),
 510         SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), 0),
 511         SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), 0),
 512         SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY_OVERRIDABLE]), 0),
 513         SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), 0),
 514         SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), 0),
 515         SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), 0),
 516         SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), 0),
 517         SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), 0),
 518         SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), 0),
 519         SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), 0),
 520         SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), 0),
 521         SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), 0),
 522         SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), 0),
 523         SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), 0),
 524         SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), 0),
 525         SD_BUS_PROPERTY("RequiresMountsFor", "as", NULL, offsetof(Unit, requires_mounts_for), 0),
 526         SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), 0),
 527         SD_BUS_PROPERTY("Description", "s", property_get_description, 0, 0),
 528         SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), 0),
 529         SD_BUS_PROPERTY("ActiveState", "s", property_get_active_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 530         SD_BUS_PROPERTY("SubState", "s", property_get_sub_state, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 531         SD_BUS_PROPERTY("FragmentPath", "s", NULL, offsetof(Unit, fragment_path), 0),
 532         SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), 0),
 533         SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), 0),
 534         SD_BUS_PROPERTY("UnitFileState", "s", property_get_unit_file_state, 0, 0),
 535         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveExitTimestamp", offsetof(Unit, inactive_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 536         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveEnterTimestamp", offsetof(Unit, active_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 537         BUS_PROPERTY_DUAL_TIMESTAMP("ActiveExitTimestamp", offsetof(Unit, active_exit_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 538         BUS_PROPERTY_DUAL_TIMESTAMP("InactiveEnterTimestamp", offsetof(Unit, inactive_enter_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 539         SD_BUS_PROPERTY("CanStart", "b", property_get_can_start, 0, 0),
 540         SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, 0),
 541         SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, 0),
 542         SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, 0),
 543         SD_BUS_PROPERTY("Job", "(uo)", property_get_job, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 544         SD_BUS_PROPERTY("StopWhenUnneeded", "b", bus_property_get_bool, offsetof(Unit, stop_when_unneeded), 0),
 545         SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), 0),
 546         SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), 0),
 547         SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), 0),
 548         SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), 0),
 549         SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), 0),
 550         SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), 0),
 551         SD_BUS_PROPERTY("IgnoreOnSnapshot", "b", bus_property_get_bool, offsetof(Unit, ignore_on_snapshot), 0),
 552         SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, 0),
 553         SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), 0),
 554         SD_BUS_PROPERTY("ConditionResult", "b", bus_property_get_bool, offsetof(Unit, condition_result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 555         BUS_PROPERTY_DUAL_TIMESTAMP("ConditionTimestamp", offsetof(Unit, condition_timestamp), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 556         SD_BUS_PROPERTY("Conditions", "a(sbbsi)", property_get_conditions, 0, 0),
 557         SD_BUS_PROPERTY("LoadError", "(ss)", property_get_load_error, 0, 0),
 558         SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), 0),
 559
 560         SD_BUS_METHOD("Start", "s", "o", method_start, 0),
 561         SD_BUS_METHOD("Stop", "s", "o", method_stop, 0),
 562         SD_BUS_METHOD("Reload", "s", "o", method_reload, 0),
 563         SD_BUS_METHOD("Restart", "s", "o", method_restart, 0),
 564         SD_BUS_METHOD("TryRestart", "s", "o", method_try_restart, 0),
 565         SD_BUS_METHOD("ReloadOrRestart", "s", "o", method_reload_or_restart, 0),
 566         SD_BUS_METHOD("ReloadOrTryRestart", "s", "o", method_reload_or_try_restart, 0),
 567         SD_BUS_METHOD("Kill", "si", NULL, bus_unit_method_kill, 0),
 568         SD_BUS_METHOD("ResetFailed", NULL, NULL, bus_unit_method_reset_failed, 0),
 569         SD_BUS_METHOD("SetProperties", "ba(sv)", NULL, bus_unit_method_set_properties, 0),
 570
 571         SD_BUS_VTABLE_END
 572 };
 573
 574 static int property_get_slice(
 575                 sd_bus *bus,
 576                 const char *path,
 577                 const char *interface,
 578                 const char *property,
 579                 sd_bus_message *reply,
 580                 void *userdata,
 581                 sd_bus_error *error) {
 582
 583         Unit *u = userdata;
 584
 585         assert(bus);
 586         assert(reply);
 587         assert(u);
 588
 589         return sd_bus_message_append(reply, "s", unit_slice_name(u));
 590 }
 591
 592 const sd_bus_vtable bus_unit_cgroup_vtable[] = {
 593         SD_BUS_VTABLE_START(0),
 594         SD_BUS_PROPERTY("Slice", "s", property_get_slice, 0, 0),
 595         SD_BUS_PROPERTY("ControlGroup", "s", NULL, offsetof(Unit, cgroup_path), 0),
 596         SD_BUS_VTABLE_END
 597 };
 598
 599 static int send_new_signal(sd_bus *bus, const char *destination, void *userdata) {
 600         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 601         _cleanup_free_ char *p = NULL;
 602         Unit *u = userdata;
 603         int r;
 604
 605         assert(bus);
 606         assert(u);
 607
 608         p = unit_dbus_path(u);
 609         if (!u)
 610                 return -ENOMEM;
 611
 612         r = sd_bus_message_new_signal(
 613                         bus,
 614                         "/org/freedesktop/systemd1",
 615                         "org.freedesktop.systemd1.Manager",
 616                         "UnitNew",
 617                         &m);
 618         if (r < 0)
 619                 return r;
 620
 621         r = sd_bus_message_append(m, "so", u->id, p);
 622         if (r < 0)
 623                 return r;
 624
 625         return sd_bus_send_to(bus, m, destination, NULL);
 626 }
 627
 628 static int send_changed_signal(sd_bus *bus, const char *destination, void *userdata) {
 629         _cleanup_free_ char *p = NULL;
 630         Unit *u = userdata;
 631         int r;
 632
 633         assert(bus);
 634         assert(u);
 635
 636         p = unit_dbus_path(u);
 637         if (!u)
 638                 return -ENOMEM;
 639
 640         /* Send a properties changed signal. First for the specific
 641          * type, then for the generic unit. The clients may rely on
 642          * this order to get atomic behavior if needed. */
 643
 644         if (UNIT_VTABLE(u)->bus_changing_properties) {
 645
 646                 r = sd_bus_emit_properties_changed_strv(
 647                                 bus, p,
 648                                 UNIT_VTABLE(u)->bus_interface,
 649                                 (char**) UNIT_VTABLE(u)->bus_changing_properties);
 650                 if (r < 0)
 651                         return r;
 652         }
 653
 654         return sd_bus_emit_properties_changed(
 655                         bus, p,
 656                         "org.freedesktop.systemd1.Unit",
 657                         "ActiveState",
 658                         "SubState",
 659                         "InactiveExitTimestamp",
 660                         "ActiveEnterTimestamp",
 661                         "ActiveExitTimestamp",
 662                         "InactiveEnterTimestamp",
 663                         "Job",
 664                         "ConditionResult",
 665                         "ConditionTimestamp",
 666                         NULL);
 667 }
 668
 669 void bus_unit_send_change_signal(Unit *u) {
 670         int r;
 671         assert(u);
 672
 673         if (u->in_dbus_queue) {
 674                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
 675                 u->in_dbus_queue = false;
 676         }
 677
 678         if (!u->id)
 679                 return;
 680
 681         r = bus_manager_foreach_client(u->manager, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
 682         if (r < 0)
 683                 log_debug("Failed to send unit change signal for %s: %s", u->id, strerror(-r));
 684
 685         u->sent_dbus_new_signal = true;
 686 }
 687
 688 static int send_removed_signal(sd_bus *bus, const char *destination, void *userdata) {
 689         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 690         _cleanup_free_ char *p = NULL;
 691         Unit *u = userdata;
 692         int r;
 693
 694         assert(bus);
 695         assert(u);
 696
 697         p = unit_dbus_path(u);
 698         if (!u)
 699                 return -ENOMEM;
 700
 701         r = sd_bus_message_new_signal(
 702                         bus,
 703                         "/org/freedesktop/systemd1",
 704                         "org.freedesktop.systemd1.Manager",
 705                         "UnitRemoved",
 706                         &m);
 707         if (r < 0)
 708                 return r;
 709
 710         r = sd_bus_message_append(m, "so", u->id, p);
 711         if (r < 0)
 712                 return r;
 713
 714         return sd_bus_send_to(bus, m, destination, NULL);
 715 }
 716
 717 void bus_unit_send_removed_signal(Unit *u) {
 718         int r;
 719         assert(u);
 720
 721         if (!u->sent_dbus_new_signal)
 722                 bus_unit_send_change_signal(u);
 723
 724         if (!u->id)
 725                 return;
 726
 727         r = bus_manager_foreach_client(u->manager, send_removed_signal, u);
 728         if (r < 0)
 729                 log_debug("Failed to send unit remove signal for %s: %s", u->id, strerror(-r));
 730 }
 731
 732 int bus_unit_queue_job(
 733                 sd_bus *bus,
 734                 sd_bus_message *message,
 735                 Unit *u,
 736                 JobType type,
 737                 JobMode mode,
 738                 bool reload_if_possible,
 739                 sd_bus_error *error) {
 740
 741         _cleanup_free_ char *path = NULL;
 742         Job *j;
 743         int r;
 744
 745         assert(bus);
 746         assert(message);
 747         assert(u);
 748         assert(type >= 0 && type < _JOB_TYPE_MAX);
 749         assert(mode >= 0 && mode < _JOB_MODE_MAX);
 750
 751         if (reload_if_possible && unit_can_reload(u)) {
 752                 if (type == JOB_RESTART)
 753                         type = JOB_RELOAD_OR_START;
 754                 else if (type == JOB_TRY_RESTART)
 755                         type = JOB_RELOAD;
 756         }
 757
 758         r = selinux_unit_access_check(
 759                         u, bus, message,
 760                         (type == JOB_START || type == JOB_RESTART || type == JOB_TRY_RESTART) ? "start" :
 761                         type == JOB_STOP ? "stop" : "reload", error);
 762         if (r < 0)
 763                 return r;
 764
 765         if (type == JOB_STOP &&
 766             (u->load_state == UNIT_NOT_FOUND || u->load_state == UNIT_ERROR) &&
 767             unit_active_state(u) == UNIT_INACTIVE)
 768                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
 769
 770         if ((type == JOB_START && u->refuse_manual_start) ||
 771             (type == JOB_STOP && u->refuse_manual_stop) ||
 772             ((type == JOB_RESTART || type == JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)))
 773                 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only.", u->id);
 774
 775         r = manager_add_job(u->manager, type, u, mode, true, error, &j);
 776         if (r < 0)
 777                 return r;
 778
 779         r = bus_client_track(&j->subscribed, bus, sd_bus_message_get_sender(message));
 780         if (r < 0)
 781                 return r;
 782
 783         path = job_dbus_path(j);
 784         if (!path)
 785                 return -ENOMEM;
 786
 787         return sd_bus_reply_method_return(message, "o", path);
 788 }
 789
 790 static int bus_unit_set_transient_property(
 791                 Unit *u,
 792                 const char *name,
 793                 sd_bus_message *message,
 794                 UnitSetPropertiesMode mode,
 795                 sd_bus_error *error) {
 796
 797         int r;
 798
 799         assert(u);
 800         assert(name);
 801         assert(message);
 802
 803         if (streq(name, "Description")) {
 804                 const char *d;
 805
 806                 r = sd_bus_message_read(message, "s", &d);
 807                 if (r < 0)
 808                         return r;
 809
 810                 if (mode != UNIT_CHECK) {
 811                         r = unit_set_description(u, d);
 812                         if (r < 0)
 813                                 return r;
 814
 815                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDescription=%s\n", d);
 816                 }
 817
 818                 return 1;
 819
 820         } else if (streq(name, "Slice") && unit_get_cgroup_context(u)) {
 821                 const char *s;
 822
 823                 r = sd_bus_message_read(message, "s", &s);
 824                 if (r < 0)
 825                         return r;
 826
 827                 if (!unit_name_is_valid(s, false) || !endswith(s, ".slice"))
 828                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid slice name %s", s);
 829
 830                 if (isempty(s)) {
 831                         if (mode != UNIT_CHECK) {
 832                                 unit_ref_unset(&u->slice);
 833                                 unit_remove_drop_in(u, mode, name);
 834                         }
 835                 } else {
 836                         Unit *slice;
 837
 838                         r = manager_load_unit(u->manager, s, NULL, error, &slice);
 839                         if (r < 0)
 840                                 return r;
 841
 842                         if (slice->type != UNIT_SLICE)
 843                                 return -EINVAL;
 844
 845                         if (mode != UNIT_CHECK) {
 846                                 unit_ref_set(&u->slice, slice);
 847                                 unit_write_drop_in_private_format(u, mode, name, "Slice=%s\n", s);
 848                         }
 849                 }
 850
 851                 return 1;
 852
 853         } else if (streq(name, "Requires") ||
 854                    streq(name, "RequiresOverridable") ||
 855                    streq(name, "Requisite") ||
 856                    streq(name, "RequisiteOverridable") ||
 857                    streq(name, "Wants") ||
 858                    streq(name, "BindsTo") ||
 859                    streq(name, "Conflicts") ||
 860                    streq(name, "Before") ||
 861                    streq(name, "After") ||
 862                    streq(name, "OnFailure") ||
 863                    streq(name, "PropagatesReloadTo") ||
 864                    streq(name, "ReloadPropagatedFrom") ||
 865                    streq(name, "PartOf")) {
 866
 867                 UnitDependency d;
 868                 const char *other;
 869
 870                 d = unit_dependency_from_string(name);
 871                 if (d < 0)
 872                         return -EINVAL;
 873
 874                 r = sd_bus_message_enter_container(message, 'a', "s");
 875                 if (r < 0)
 876                         return r;
 877
 878                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
 879                         if (!unit_name_is_valid(other, false))
 880                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
 881
 882                         if (mode != UNIT_CHECK) {
 883                                 _cleanup_free_ char *label = NULL;
 884
 885                                 r = unit_add_dependency_by_name(u, d, other, NULL, true);
 886                                 if (r < 0)
 887                                         return r;
 888
 889                                 label = strjoin(name, "-", other, NULL);
 890                                 if (!label)
 891                                         return -ENOMEM;
 892
 893                                 unit_write_drop_in_format(u, mode, label, "[Unit]\n%s=%s\n", name, other);
 894                         }
 895
 896                 }
 897                 if (r < 0)
 898                         return r;
 899
 900                 r = sd_bus_message_exit_container(message);
 901                 if (r < 0)
 902                         return r;
 903
 904                 return 1;
 905         }
 906
 907         return 0;
 908 }
 909
 910 int bus_unit_set_properties(
 911                 Unit *u,
 912                 sd_bus_message *message,
 913                 UnitSetPropertiesMode mode,
 914                 bool commit,
 915                 sd_bus_error *error) {
 916
 917         bool for_real = false;
 918         unsigned n = 0;
 919         int r;
 920
 921         assert(u);
 922         assert(message);
 923
 924         if (u->transient)
 925                 mode &= UNIT_RUNTIME;
 926
 927         /* We iterate through the array twice. First run we just check
 928          * if all passed data is valid, second run actually applies
 929          * it. This is to implement transaction-like behaviour without
 930          * actually providing full transactions. */
 931
 932         r = sd_bus_message_enter_container(message, 'a', "(sv)");
 933         if (r < 0)
 934                 return r;
 935
 936         for (;;) {
 937                 const char *name;
 938
 939                 r = sd_bus_message_enter_container(message, 'r', "sv");
 940                 if (r < 0)
 941                         return r;
 942                 if (r == 0) {
 943                         if (for_real || mode == UNIT_CHECK)
 944                                 break;
 945
 946                         /* Reached EOF. Let's try again, and this time for realz... */
 947                         r = sd_bus_message_rewind(message, false);
 948                         if (r < 0)
 949                                 return r;
 950
 951                         for_real = true;
 952                         continue;
 953                 }
 954
 955                 r = sd_bus_message_read(message, "s", &name);
 956                 if (r < 0)
 957                         return r;
 958
 959                 if (!UNIT_VTABLE(u)->bus_set_property)
 960                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
 961
 962                 r = sd_bus_message_enter_container(message, 'v', NULL);
 963                 if (r < 0)
 964                         return r;
 965
 966                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
 967                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
 968                         r = bus_unit_set_transient_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
 969                 if (r < 0)
 970                         return r;
 971                 if (r == 0)
 972                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
 973
 974                 r = sd_bus_message_exit_container(message);
 975                 if (r < 0)
 976                         return r;
 977
 978                 r = sd_bus_message_exit_container(message);
 979                 if (r < 0)
 980                         return r;
 981
 982                 n += for_real;
 983         }
 984
 985         r = sd_bus_message_exit_container(message);
 986         if (r < 0)
 987                 return r;
 988
 989         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
 990                 UNIT_VTABLE(u)->bus_commit_properties(u);
 991
 992         return n;
 993 }