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, 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), 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                 log_warning("Failed to send out specific PropertiesChanged signal for %s: %s", u->id, strerror(-r));
 643                 return r;
 644         }
 645
 646         r = sd_bus_emit_properties_changed_strv(
 647                         bus, p,
 648                         "org.freedesktop.systemd1.Unit",
 649                         NULL);
 650         if (r < 0) {
 651                 log_warning("Failed to send out generic PropertiesChanged signal for %s: %s", u->id, strerror(-r));
 652                 return r;
 653         }
 654
 655         return 0;
 656 }
 657
 658 void bus_unit_send_change_signal(Unit *u) {
 659         int r;
 660         assert(u);
 661
 662         if (u->in_dbus_queue) {
 663                 LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
 664                 u->in_dbus_queue = false;
 665         }
 666
 667         if (!u->id)
 668                 return;
 669
 670         r = bus_foreach_bus(u->manager, NULL, u->sent_dbus_new_signal ? send_changed_signal : send_new_signal, u);
 671         if (r < 0)
 672                 log_debug("Failed to send unit change signal for %s: %s", u->id, strerror(-r));
 673
 674         u->sent_dbus_new_signal = true;
 675 }
 676
 677 static int send_removed_signal(sd_bus *bus, void *userdata) {
 678         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
 679         _cleanup_free_ char *p = NULL;
 680         Unit *u = userdata;
 681         int r;
 682
 683         assert(bus);
 684         assert(u);
 685
 686         p = unit_dbus_path(u);
 687         if (!u)
 688                 return -ENOMEM;
 689
 690         r = sd_bus_message_new_signal(
 691                         bus,
 692                         &m,
 693                         "/org/freedesktop/systemd1",
 694                         "org.freedesktop.systemd1.Manager",
 695                         "UnitRemoved");
 696         if (r < 0)
 697                 return r;
 698
 699         r = sd_bus_message_append(m, "so", u->id, p);
 700         if (r < 0)
 701                 return r;
 702
 703         return sd_bus_send(bus, m, NULL);
 704 }
 705
 706 void bus_unit_send_removed_signal(Unit *u) {
 707         int r;
 708         assert(u);
 709
 710         if (!u->sent_dbus_new_signal)
 711                 bus_unit_send_change_signal(u);
 712
 713         if (!u->id)
 714                 return;
 715
 716         r = bus_foreach_bus(u->manager, NULL, send_removed_signal, u);
 717         if (r < 0)
 718                 log_debug("Failed to send unit remove signal for %s: %s", u->id, strerror(-r));
 719 }
 720
 721 int bus_unit_queue_job(
 722                 sd_bus *bus,
 723                 sd_bus_message *message,
 724                 Unit *u,
 725                 JobType type,
 726                 JobMode mode,
 727                 bool reload_if_possible,
 728                 sd_bus_error *error) {
 729
 730         _cleanup_free_ char *path = NULL;
 731         Job *j;
 732         int r;
 733
 734         assert(bus);
 735         assert(message);
 736         assert(u);
 737         assert(type >= 0 && type < _JOB_TYPE_MAX);
 738         assert(mode >= 0 && mode < _JOB_MODE_MAX);
 739
 740         if (reload_if_possible && unit_can_reload(u)) {
 741                 if (type == JOB_RESTART)
 742                         type = JOB_RELOAD_OR_START;
 743                 else if (type == JOB_TRY_RESTART)
 744                         type = JOB_RELOAD;
 745         }
 746
 747         r = selinux_unit_access_check(
 748                         u, bus, message,
 749                         (type == JOB_START || type == JOB_RESTART || type == JOB_TRY_RESTART) ? "start" :
 750                         type == JOB_STOP ? "stop" : "reload", error);
 751         if (r < 0)
 752                 return r;
 753
 754         if (type == JOB_STOP &&
 755             (u->load_state == UNIT_NOT_FOUND || u->load_state == UNIT_ERROR) &&
 756             unit_active_state(u) == UNIT_INACTIVE)
 757                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Unit %s not loaded.", u->id);
 758
 759         if ((type == JOB_START && u->refuse_manual_start) ||
 760             (type == JOB_STOP && u->refuse_manual_stop) ||
 761             ((type == JOB_RESTART || type == JOB_TRY_RESTART) && (u->refuse_manual_start || u->refuse_manual_stop)))
 762                 return sd_bus_error_setf(error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, unit %s may be requested by dependency only.", u->id);
 763
 764         r = manager_add_job(u->manager, type, u, mode, true, error, &j);
 765         if (r < 0)
 766                 return r;
 767
 768         if (bus == u->manager->api_bus) {
 769                 if (!j->subscribed) {
 770                         r = sd_bus_track_new(bus, &j->subscribed, NULL, NULL);
 771                         if (r < 0)
 772                                 return r;
 773                 }
 774
 775                 r = sd_bus_track_add_sender(j->subscribed, message);
 776                 if (r < 0)
 777                         return r;
 778         }
 779
 780         path = job_dbus_path(j);
 781         if (!path)
 782                 return -ENOMEM;
 783
 784         return sd_bus_reply_method_return(message, "o", path);
 785 }
 786
 787 static int bus_unit_set_transient_property(
 788                 Unit *u,
 789                 const char *name,
 790                 sd_bus_message *message,
 791                 UnitSetPropertiesMode mode,
 792                 sd_bus_error *error) {
 793
 794         int r;
 795
 796         assert(u);
 797         assert(name);
 798         assert(message);
 799
 800         if (streq(name, "Description")) {
 801                 const char *d;
 802
 803                 r = sd_bus_message_read(message, "s", &d);
 804                 if (r < 0)
 805                         return r;
 806
 807                 if (mode != UNIT_CHECK) {
 808                         r = unit_set_description(u, d);
 809                         if (r < 0)
 810                                 return r;
 811
 812                         unit_write_drop_in_format(u, mode, name, "[Unit]\nDescription=%s\n", d);
 813                 }
 814
 815                 return 1;
 816
 817         } else if (streq(name, "Slice") && unit_get_cgroup_context(u)) {
 818                 const char *s;
 819
 820                 r = sd_bus_message_read(message, "s", &s);
 821                 if (r < 0)
 822                         return r;
 823
 824                 if (!unit_name_is_valid(s, TEMPLATE_INVALID) || !endswith(s, ".slice"))
 825                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid slice name %s", s);
 826
 827                 if (isempty(s)) {
 828                         if (mode != UNIT_CHECK) {
 829                                 unit_ref_unset(&u->slice);
 830                                 unit_remove_drop_in(u, mode, name);
 831                         }
 832                 } else {
 833                         Unit *slice;
 834
 835                         r = manager_load_unit(u->manager, s, NULL, error, &slice);
 836                         if (r < 0)
 837                                 return r;
 838
 839                         if (slice->type != UNIT_SLICE)
 840                                 return -EINVAL;
 841
 842                         if (mode != UNIT_CHECK) {
 843                                 unit_ref_set(&u->slice, slice);
 844                                 unit_write_drop_in_private_format(u, mode, name, "Slice=%s\n", s);
 845                         }
 846                 }
 847
 848                 return 1;
 849
 850         } else if (streq(name, "Requires") ||
 851                    streq(name, "RequiresOverridable") ||
 852                    streq(name, "Requisite") ||
 853                    streq(name, "RequisiteOverridable") ||
 854                    streq(name, "Wants") ||
 855                    streq(name, "BindsTo") ||
 856                    streq(name, "Conflicts") ||
 857                    streq(name, "Before") ||
 858                    streq(name, "After") ||
 859                    streq(name, "OnFailure") ||
 860                    streq(name, "PropagatesReloadTo") ||
 861                    streq(name, "ReloadPropagatedFrom") ||
 862                    streq(name, "PartOf")) {
 863
 864                 UnitDependency d;
 865                 const char *other;
 866
 867                 d = unit_dependency_from_string(name);
 868                 if (d < 0)
 869                         return -EINVAL;
 870
 871                 r = sd_bus_message_enter_container(message, 'a', "s");
 872                 if (r < 0)
 873                         return r;
 874
 875                 while ((r = sd_bus_message_read(message, "s", &other)) > 0) {
 876                         if (!unit_name_is_valid(other, TEMPLATE_INVALID))
 877                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid unit name %s", other);
 878
 879                         if (mode != UNIT_CHECK) {
 880                                 _cleanup_free_ char *label = NULL;
 881
 882                                 r = unit_add_dependency_by_name(u, d, other, NULL, true);
 883                                 if (r < 0)
 884                                         return r;
 885
 886                                 label = strjoin(name, "-", other, NULL);
 887                                 if (!label)
 888                                         return -ENOMEM;
 889
 890                                 unit_write_drop_in_format(u, mode, label, "[Unit]\n%s=%s\n", name, other);
 891                         }
 892
 893                 }
 894                 if (r < 0)
 895                         return r;
 896
 897                 r = sd_bus_message_exit_container(message);
 898                 if (r < 0)
 899                         return r;
 900
 901                 return 1;
 902         }
 903
 904         return 0;
 905 }
 906
 907 int bus_unit_set_properties(
 908                 Unit *u,
 909                 sd_bus_message *message,
 910                 UnitSetPropertiesMode mode,
 911                 bool commit,
 912                 sd_bus_error *error) {
 913
 914         bool for_real = false;
 915         unsigned n = 0;
 916         int r;
 917
 918         assert(u);
 919         assert(message);
 920
 921         /* We iterate through the array twice. First run we just check
 922          * if all passed data is valid, second run actually applies
 923          * it. This is to implement transaction-like behaviour without
 924          * actually providing full transactions. */
 925
 926         r = sd_bus_message_enter_container(message, 'a', "(sv)");
 927         if (r < 0)
 928                 return r;
 929
 930         for (;;) {
 931                 const char *name;
 932
 933                 r = sd_bus_message_enter_container(message, 'r', "sv");
 934                 if (r < 0)
 935                         return r;
 936                 if (r == 0) {
 937                         if (for_real || mode == UNIT_CHECK)
 938                                 break;
 939
 940                         /* Reached EOF. Let's try again, and this time for realz... */
 941                         r = sd_bus_message_rewind(message, false);
 942                         if (r < 0)
 943                                 return r;
 944
 945                         for_real = true;
 946                         continue;
 947                 }
 948
 949                 r = sd_bus_message_read(message, "s", &name);
 950                 if (r < 0)
 951                         return r;
 952
 953                 if (!UNIT_VTABLE(u)->bus_set_property)
 954                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Objects of this type do not support setting properties.");
 955
 956                 r = sd_bus_message_enter_container(message, 'v', NULL);
 957                 if (r < 0)
 958                         return r;
 959
 960                 r = UNIT_VTABLE(u)->bus_set_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
 961                 if (r == 0 && u->transient && u->load_state == UNIT_STUB)
 962                         r = bus_unit_set_transient_property(u, name, message, for_real ? mode : UNIT_CHECK, error);
 963                 if (r < 0)
 964                         return r;
 965                 if (r == 0)
 966                         return sd_bus_error_setf(error, SD_BUS_ERROR_PROPERTY_READ_ONLY, "Cannot set property %s, or unknown property.", name);
 967
 968                 r = sd_bus_message_exit_container(message);
 969                 if (r < 0)
 970                         return r;
 971
 972                 r = sd_bus_message_exit_container(message);
 973                 if (r < 0)
 974                         return r;
 975
 976                 n += for_real;
 977         }
 978
 979         r = sd_bus_message_exit_container(message);
 980         if (r < 0)
 981                 return r;
 982
 983         if (commit && n > 0 && UNIT_VTABLE(u)->bus_commit_properties)
 984                 UNIT_VTABLE(u)->bus_commit_properties(u);
 985
 986         return n;
 987 }