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 "bus-errors.h"
  30 #include "dbus.h"
  31 #include "dbus-manager.h"
  32 #include "dbus-unit.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, 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, 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, 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), SD_BUS_VTABLE_PROPERTY_CONST),
 494         SD_BUS_PROPERTY("Names", "as", property_get_names, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 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]), SD_BUS_VTABLE_PROPERTY_CONST),
 497         SD_BUS_PROPERTY("RequiresOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRES_OVERRIDABLE]), SD_BUS_VTABLE_PROPERTY_CONST),
 498         SD_BUS_PROPERTY("Requisite", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE]), SD_BUS_VTABLE_PROPERTY_CONST),
 499         SD_BUS_PROPERTY("RequisiteOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUISITE_OVERRIDABLE]), SD_BUS_VTABLE_PROPERTY_CONST),
 500         SD_BUS_PROPERTY("Wants", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 501         SD_BUS_PROPERTY("BindsTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BINDS_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 502         SD_BUS_PROPERTY("PartOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PART_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 503         SD_BUS_PROPERTY("RequiredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 504         SD_BUS_PROPERTY("RequiredByOverridable", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_REQUIRED_BY_OVERRIDABLE]), SD_BUS_VTABLE_PROPERTY_CONST),
 505         SD_BUS_PROPERTY("WantedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_WANTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 506         SD_BUS_PROPERTY("BoundBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BOUND_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 507         SD_BUS_PROPERTY("ConsistsOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONSISTS_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 508         SD_BUS_PROPERTY("Conflicts", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTS]), SD_BUS_VTABLE_PROPERTY_CONST),
 509         SD_BUS_PROPERTY("ConflictedBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_CONFLICTED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 510         SD_BUS_PROPERTY("Before", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_BEFORE]), SD_BUS_VTABLE_PROPERTY_CONST),
 511         SD_BUS_PROPERTY("After", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_AFTER]), SD_BUS_VTABLE_PROPERTY_CONST),
 512         SD_BUS_PROPERTY("OnFailure", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_ON_FAILURE]), SD_BUS_VTABLE_PROPERTY_CONST),
 513         SD_BUS_PROPERTY("Triggers", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERS]), SD_BUS_VTABLE_PROPERTY_CONST),
 514         SD_BUS_PROPERTY("TriggeredBy", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_TRIGGERED_BY]), SD_BUS_VTABLE_PROPERTY_CONST),
 515         SD_BUS_PROPERTY("PropagatesReloadTo", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_PROPAGATES_RELOAD_TO]), SD_BUS_VTABLE_PROPERTY_CONST),
 516         SD_BUS_PROPERTY("ReloadPropagatedFrom", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_RELOAD_PROPAGATED_FROM]), SD_BUS_VTABLE_PROPERTY_CONST),
 517         SD_BUS_PROPERTY("JoinsNamespaceOf", "as", property_get_dependencies, offsetof(Unit, dependencies[UNIT_JOINS_NAMESPACE_OF]), SD_BUS_VTABLE_PROPERTY_CONST),
 518         SD_BUS_PROPERTY("RequiresMountsFor", "as", NULL, offsetof(Unit, requires_mounts_for), SD_BUS_VTABLE_PROPERTY_CONST),
 519         SD_BUS_PROPERTY("Documentation", "as", NULL, offsetof(Unit, documentation), SD_BUS_VTABLE_PROPERTY_CONST),
 520         SD_BUS_PROPERTY("Description", "s", property_get_description, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 521         SD_BUS_PROPERTY("LoadState", "s", property_get_load_state, offsetof(Unit, load_state), SD_BUS_VTABLE_PROPERTY_CONST),
 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), SD_BUS_VTABLE_PROPERTY_CONST),
 525         SD_BUS_PROPERTY("SourcePath", "s", NULL, offsetof(Unit, source_path), SD_BUS_VTABLE_PROPERTY_CONST),
 526         SD_BUS_PROPERTY("DropInPaths", "as", NULL, offsetof(Unit, dropin_paths), SD_BUS_VTABLE_PROPERTY_CONST),
 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, SD_BUS_VTABLE_PROPERTY_CONST),
 533         SD_BUS_PROPERTY("CanStop", "b", property_get_can_stop, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 534         SD_BUS_PROPERTY("CanReload", "b", property_get_can_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 535         SD_BUS_PROPERTY("CanIsolate", "b", property_get_can_isolate, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 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), SD_BUS_VTABLE_PROPERTY_CONST),
 538         SD_BUS_PROPERTY("RefuseManualStart", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_start), SD_BUS_VTABLE_PROPERTY_CONST),
 539         SD_BUS_PROPERTY("RefuseManualStop", "b", bus_property_get_bool, offsetof(Unit, refuse_manual_stop), SD_BUS_VTABLE_PROPERTY_CONST),
 540         SD_BUS_PROPERTY("AllowIsolate", "b", bus_property_get_bool, offsetof(Unit, allow_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 541         SD_BUS_PROPERTY("DefaultDependencies", "b", bus_property_get_bool, offsetof(Unit, default_dependencies), SD_BUS_VTABLE_PROPERTY_CONST),
 542         SD_BUS_PROPERTY("OnFailureJobMode", "s", property_get_job_mode, offsetof(Unit, on_failure_job_mode), SD_BUS_VTABLE_PROPERTY_CONST),
 543         SD_BUS_PROPERTY("IgnoreOnIsolate", "b", bus_property_get_bool, offsetof(Unit, ignore_on_isolate), SD_BUS_VTABLE_PROPERTY_CONST),
 544         SD_BUS_PROPERTY("IgnoreOnSnapshot", "b", bus_property_get_bool, offsetof(Unit, ignore_on_snapshot), SD_BUS_VTABLE_PROPERTY_CONST),
 545         SD_BUS_PROPERTY("NeedDaemonReload", "b", property_get_need_daemon_reload, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 546         SD_BUS_PROPERTY("JobTimeoutUSec", "t", bus_property_get_usec, offsetof(Unit, job_timeout), SD_BUS_VTABLE_PROPERTY_CONST),
 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, SD_BUS_VTABLE_PROPERTY_CONST),
 551         SD_BUS_PROPERTY("Transient", "b", bus_property_get_bool, offsetof(Unit, transient), SD_BUS_VTABLE_PROPERTY_CONST),
 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, 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                         &m,
 608                         "/org/freedesktop/systemd1",
 609                         "org.freedesktop.systemd1.Manager",
 610                         "UnitNew");
 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(bus, m, NULL);
 619 }
 620
 621 static int send_changed_signal(sd_bus *bus, 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 (!p)
 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         r = sd_bus_emit_properties_changed_strv(
 638                         bus, p,
 639                         UNIT_VTABLE(u)->bus_interface,
 640                         NULL);
 641         if (r < 0)
 642                 return r;
 643
 644         return sd_bus_emit_properties_changed_strv(
 645                         bus, p,
 646                         "org.freedesktop.systemd1.Unit",
 647                         NULL);
 648 }
 649
 650 void bus_unit_send_change_signal(Unit *u) {
 651         int r;
 652         assert(u);
 653
 654         if (u->in_dbus_queue) {
 655                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
 656                 u->in_dbus_queue = false;
 657         }
 658
 659         if (!u->id)
 660                 return;
 661
 662         r = bus_foreach_bus(u->manager, NULL, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
 663         if (r < 0)
 664                 log_debug("Failed to send unit change signal for %s: %s", u->id, strerror(-r));
 665
 666         u->sent_dbus_new_signal = true;
 667 }
 668
 669 static int send_removed_signal(sd_bus *bus, void *userdata) {
 670         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 671         _cleanup_free_ char *p = NULL;
 672         Unit *u = userdata;
 673         int r;
 674
 675         assert(bus);
 676         assert(u);
 677
 678         p = unit_dbus_path(u);
 679         if (!u)
 680                 return -ENOMEM;
 681
 682         r = sd_bus_message_new_signal(
 683                         bus,
 684                         &m,
 685                         "/org/freedesktop/systemd1",
 686                         "org.freedesktop.systemd1.Manager",
 687                         "UnitRemoved");
 688         if (r < 0)
 689                 return r;
 690
 691         r = sd_bus_message_append(m, "so", u->id, p);
 692         if (r < 0)
 693                 return r;
 694
 695         return sd_bus_send(bus, m, NULL);
 696 }
 697
 698 void bus_unit_send_removed_signal(Unit *u) {
 699         int r;
 700         assert(u);
 701
 702         if (!u->sent_dbus_new_signal)
 703                 bus_unit_send_change_signal(u);
 704
 705         if (!u->id)
 706                 return;
 707
 708         r = bus_foreach_bus(u->manager, NULL, send_removed_signal, u);
 709         if (r < 0)
 710                 log_debug("Failed to send unit remove signal for %s: %s", u->id, strerror(-r));
 711 }
 712
 713 int bus_unit_queue_job(
 714                 sd_bus *bus,
 715                 sd_bus_message *message,
 716                 Unit *u,
 717                 JobType type,
 718                 JobMode mode,
 719                 bool reload_if_possible,
 720                 sd_bus_error *error) {
 721
 722         _cleanup_free_ char *path = NULL;
 723         Job *j;
 724         int r;
 725
 726         assert(bus);
 727         assert(message);
 728         assert(u);
 729         assert(type >= 0 && type < _JOB_TYPE_MAX);
 730         assert(mode >= 0 && mode < _JOB_MODE_MAX);
 731
 732         if (reload_if_possible && unit_can_reload(u)) {
 733                 if (type == JOB_RESTART)
 734                         type = JOB_RELOAD_OR_START;
 735                 else if (type == JOB_TRY_RESTART)
 736                         type = JOB_RELOAD;
 737         }
 738
 739         r = selinux_unit_access_check(
 740                         u, message,
 741                         (type == JOB_START || type == JOB_RESTART || type == JOB_TRY_RESTART) ? "start" :
 742                         type == JOB_STOP ? "stop" : "reload", error);
 743         if (r < 0)
 744                 return r;
 745
 746         if (type == JOB_STOP &&
 747             (u->load_state == UNIT_NOT_FOUND || u->load_state == UNIT_ERROR) &&
 748             unit_active_state(u) == UNIT_INACTIVE)
 749                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
 750
 751         if ((type == JOB_START && u->refuse_manual_start) ||
 752             (type == JOB_STOP && u->refuse_manual_stop) ||
 753             ((type == JOB_RESTART || type == JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)))
 754                 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only.", u->id);
 755
 756         r = manager_add_job(u->manager, type, u, mode, true, error, &j);
 757         if (r < 0)
 758                 return r;
 759
 760         if (bus == u->manager->api_bus) {
 761                 if (!j->subscribed) {
 762                         r = sd_bus_track_new(bus, &j->subscribed, NULL, NULL);
 763                         if (r < 0)
 764                                 return r;
 765                 }
 766
 767                 r = sd_bus_track_add_sender(j->subscribed, message);
 768                 if (r < 0)
 769                         return r;
 770         }
 771
 772         path = job_dbus_path(j);
 773         if (!path)
 774                 return -ENOMEM;
 775
 776         return sd_bus_reply_method_return(message, "o", path);
 777 }
 778
 779 static int bus_unit_set_transient_property(
 780                 Unit *u,
 781                 const char *name,
 782                 sd_bus_message *message,
 783                 UnitSetPropertiesMode mode,
 784                 sd_bus_error *error) {
 785
 786         int r;
 787
 788         assert(u);
 789         assert(name);
 790         assert(message);
 791
 792         if (streq(name, "Description")) {
 793                 const char *d;
 794
 795                 r = sd_bus_message_read(message, "s", &d);
 796                 if (r < 0)
 797                         return r;
 798
 799                 if (mode != UNIT_CHECK) {
 800                         r = unit_set_description(u, d);
 801                         if (r < 0)
 802                                 return r;
 803
 804                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDescription=%s\n", d);
 805                 }
 806
 807                 return 1;
 808
 809         } else if (streq(name, "Slice") && unit_get_cgroup_context(u)) {
 810                 const char *s;
 811
 812                 r = sd_bus_message_read(message, "s", &s);
 813                 if (r < 0)
 814                         return r;
 815
 816                 if (!unit_name_is_valid(s, TEMPLATE_INVALID) || !endswith(s, ".slice"))
 817                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid slice name %s", s);
 818
 819                 if (isempty(s)) {
 820                         if (mode != UNIT_CHECK) {
 821                                 unit_ref_unset(&u->slice);
 822                                 unit_remove_drop_in(u, mode, name);
 823                         }
 824                 } else {
 825                         Unit *slice;
 826
 827                         r = manager_load_unit(u->manager, s, NULL, error, &slice);
 828                         if (r < 0)
 829                                 return r;
 830
 831                         if (slice->type != UNIT_SLICE)
 832                                 return -EINVAL;
 833
 834                         if (mode != UNIT_CHECK) {
 835                                 unit_ref_set(&u->slice, slice);
 836                                 unit_write_drop_in_private_format(u, mode, name, "Slice=%s\n", s);
 837                         }
 838                 }
 839
 840                 return 1;
 841
 842         } else if (streq(name, "Requires") ||
 843                    streq(name, "RequiresOverridable") ||
 844                    streq(name, "Requisite") ||
 845                    streq(name, "RequisiteOverridable") ||
 846                    streq(name, "Wants") ||
 847                    streq(name, "BindsTo") ||
 848                    streq(name, "Conflicts") ||
 849                    streq(name, "Before") ||
 850                    streq(name, "After") ||
 851                    streq(name, "OnFailure") ||
 852                    streq(name, "PropagatesReloadTo") ||
 853                    streq(name, "ReloadPropagatedFrom") ||
 854                    streq(name, "PartOf")) {
 855
 856                 UnitDependency d;
 857                 const char *other;
 858
 859                 d = unit_dependency_from_string(name);
 860                 if (d < 0)
 861                         return -EINVAL;
 862
 863                 r = sd_bus_message_enter_container(message, 'a', "s");
 864                 if (r < 0)
 865                         return r;
 866
 867                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
 868                         if (!unit_name_is_valid(other, TEMPLATE_INVALID))
 869                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
 870
 871                         if (mode != UNIT_CHECK) {
 872                                 _cleanup_free_ char *label = NULL;
 873
 874                                 r = unit_add_dependency_by_name(u, d, other, NULL, true);
 875                                 if (r < 0)
 876                                         return r;
 877
 878                                 label = strjoin(name, "-", other, NULL);
 879                                 if (!label)
 880                                         return -ENOMEM;
 881
 882                                 unit_write_drop_in_format(u, mode, label, "[Unit]\n%s=%s\n", name, other);
 883                         }
 884
 885                 }
 886                 if (r < 0)
 887                         return r;
 888
 889                 r = sd_bus_message_exit_container(message);
 890                 if (r < 0)
 891                         return r;
 892
 893                 return 1;
 894         }
 895
 896         return 0;
 897 }
 898
 899 int bus_unit_set_properties(
 900                 Unit *u,
 901                 sd_bus_message *message,
 902                 UnitSetPropertiesMode mode,
 903                 bool commit,
 904                 sd_bus_error *error) {
 905
 906         bool for_real = false;
 907         unsigned n = 0;
 908         int r;
 909
 910         assert(u);
 911         assert(message);
 912
 913         /* We iterate through the array twice. First run we just check
 914          * if all passed data is valid, second run actually applies
 915          * it. This is to implement transaction-like behaviour without
 916          * actually providing full transactions. */
 917
 918         r = sd_bus_message_enter_container(message, 'a', "(sv)");
 919         if (r < 0)
 920                 return r;
 921
 922         for (;;) {
 923                 const char *name;
 924
 925                 r = sd_bus_message_enter_container(message, 'r', "sv");
 926                 if (r < 0)
 927                         return r;
 928                 if (r == 0) {
 929                         if (for_real || mode == UNIT_CHECK)
 930                                 break;
 931
 932                         /* Reached EOF. Let's try again, and this time for realz... */
 933                         r = sd_bus_message_rewind(message, false);
 934                         if (r < 0)
 935                                 return r;
 936
 937                         for_real = true;
 938                         continue;
 939                 }
 940
 941                 r = sd_bus_message_read(message, "s", &name);
 942                 if (r < 0)
 943                         return r;
 944
 945                 if (!UNIT_VTABLE(u)->bus_set_property)
 946                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
 947
 948                 r = sd_bus_message_enter_container(message, 'v', NULL);
 949                 if (r < 0)
 950                         return r;
 951
 952                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
 953                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
 954                         r = bus_unit_set_transient_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
 955                 if (r < 0)
 956                         return r;
 957                 if (r == 0)
 958                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
 959
 960                 r = sd_bus_message_exit_container(message);
 961                 if (r < 0)
 962                         return r;
 963
 964                 r = sd_bus_message_exit_container(message);
 965                 if (r < 0)
 966                         return r;
 967
 968                 n += for_real;
 969         }
 970
 971         r = sd_bus_message_exit_container(message);
 972         if (r < 0)
 973                 return r;
 974
 975         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
 976                 UNIT_VTABLE(u)->bus_commit_properties(u);
 977
 978         return n;
 979 }