src/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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23
  24 #include "dbus.h"
  25 #include "log.h"
  26 #include "dbus-unit.h"
  27 #include "bus-errors.h"
  28
  29 const char bus_unit_interface[] = BUS_UNIT_INTERFACE;
  30
  31 #define INVALIDATING_PROPERTIES                 \
  32         "LoadState\0"                           \
  33         "ActiveState\0"                         \
  34         "SubState\0"                            \
  35         "InactiveExitTimestamp\0"               \
  36         "ActiveEnterTimestamp\0"                \
  37         "ActiveExitTimestamp\0"                 \
  38         "InactiveEnterTimestamp\0"              \
  39         "Job\0"                                 \
  40         "NeedDaemonReload\0"                    \
  41         "\0"
  42
  43 int bus_unit_append_names(Manager *m, DBusMessageIter *i, const char *property, void *data) {
  44         char *t;
  45         Iterator j;
  46         DBusMessageIter sub;
  47         Unit *u = data;
  48
  49         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
  50                 return -ENOMEM;
  51
  52         SET_FOREACH(t, u->meta.names, j)
  53                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t))
  54                         return -ENOMEM;
  55
  56         if (!dbus_message_iter_close_container(i, &sub))
  57                 return -ENOMEM;
  58
  59         return 0;
  60 }
  61
  62 int bus_unit_append_following(Manager *m, DBusMessageIter *i, const char *property, void *data) {
  63         Unit *u = data, *f;
  64         const char *d;
  65
  66         assert(m);
  67         assert(i);
  68         assert(property);
  69         assert(u);
  70
  71         f = unit_following(u);
  72         d = f ? f->meta.id : "";
  73
  74         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d))
  75                 return -ENOMEM;
  76
  77         return 0;
  78 }
  79
  80 int bus_unit_append_dependencies(Manager *m, DBusMessageIter *i, const char *property, void *data) {
  81         Unit *u;
  82         Iterator j;
  83         DBusMessageIter sub;
  84         Set *s = data;
  85
  86         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
  87                 return -ENOMEM;
  88
  89         SET_FOREACH(u, s, j)
  90                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &u->meta.id))
  91                         return -ENOMEM;
  92
  93         if (!dbus_message_iter_close_container(i, &sub))
  94                 return -ENOMEM;
  95
  96         return 0;
  97 }
  98
  99 int bus_unit_append_description(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 100         Unit *u = data;
 101         const char *d;
 102
 103         assert(m);
 104         assert(i);
 105         assert(property);
 106         assert(u);
 107
 108         d = unit_description(u);
 109
 110         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d))
 111                 return -ENOMEM;
 112
 113         return 0;
 114 }
 115
 116 DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_unit_append_load_state, unit_load_state, UnitLoadState);
 117
 118 int bus_unit_append_active_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 119         Unit *u = data;
 120         const char *state;
 121
 122         assert(m);
 123         assert(i);
 124         assert(property);
 125         assert(u);
 126
 127         state = unit_active_state_to_string(unit_active_state(u));
 128
 129         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
 130                 return -ENOMEM;
 131
 132         return 0;
 133 }
 134
 135 int bus_unit_append_sub_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 136         Unit *u = data;
 137         const char *state;
 138
 139         assert(m);
 140         assert(i);
 141         assert(property);
 142         assert(u);
 143
 144         state = unit_sub_state_to_string(u);
 145
 146         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
 147                 return -ENOMEM;
 148
 149         return 0;
 150 }
 151
 152 int bus_unit_append_can_start(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 153         Unit *u = data;
 154         dbus_bool_t b;
 155
 156         assert(m);
 157         assert(i);
 158         assert(property);
 159         assert(u);
 160
 161         b = unit_can_start(u) &&
 162                 !u->meta.refuse_manual_start;
 163
 164         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 165                 return -ENOMEM;
 166
 167         return 0;
 168 }
 169
 170 int bus_unit_append_can_stop(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 171         Unit *u = data;
 172         dbus_bool_t b;
 173
 174         assert(m);
 175         assert(i);
 176         assert(property);
 177         assert(u);
 178
 179         /* On the lower levels we assume that every unit we can start
 180          * we can also stop */
 181
 182         b = unit_can_start(u) &&
 183                 !u->meta.refuse_manual_stop;
 184
 185         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 186                 return -ENOMEM;
 187
 188         return 0;
 189 }
 190
 191 int bus_unit_append_can_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 192         Unit *u = data;
 193         dbus_bool_t b;
 194
 195         assert(m);
 196         assert(i);
 197         assert(property);
 198         assert(u);
 199
 200         b = unit_can_reload(u);
 201
 202         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 203                 return -ENOMEM;
 204
 205         return 0;
 206 }
 207
 208 int bus_unit_append_can_isolate(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 209         Unit *u = data;
 210         dbus_bool_t b;
 211
 212         assert(m);
 213         assert(i);
 214         assert(property);
 215         assert(u);
 216
 217         b = unit_can_isolate(u) &&
 218                 !u->meta.refuse_manual_start;
 219
 220         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 221                 return -ENOMEM;
 222
 223         return 0;
 224 }
 225
 226 int bus_unit_append_job(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 227         Unit *u = data;
 228         DBusMessageIter sub;
 229         char *p;
 230
 231         assert(m);
 232         assert(i);
 233         assert(property);
 234         assert(u);
 235
 236         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
 237                 return -ENOMEM;
 238
 239         if (u->meta.job) {
 240
 241                 if (!(p = job_dbus_path(u->meta.job)))
 242                         return -ENOMEM;
 243
 244                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->meta.job->id) ||
 245                     !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
 246                         free(p);
 247                         return -ENOMEM;
 248                 }
 249         } else {
 250                 uint32_t id = 0;
 251
 252                 /* No job, so let's fill in some placeholder
 253                  * data. Since we need to fill in a valid path we
 254                  * simple point to ourselves. */
 255
 256                 if (!(p = unit_dbus_path(u)))
 257                         return -ENOMEM;
 258
 259                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &id) ||
 260                     !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
 261                         free(p);
 262                         return -ENOMEM;
 263                 }
 264         }
 265
 266         free(p);
 267
 268         if (!dbus_message_iter_close_container(i, &sub))
 269                 return -ENOMEM;
 270
 271         return 0;
 272 }
 273
 274 int bus_unit_append_default_cgroup(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 275         Unit *u = data;
 276         char *t;
 277         CGroupBonding *cgb;
 278         bool success;
 279
 280         assert(m);
 281         assert(i);
 282         assert(property);
 283         assert(u);
 284
 285         if ((cgb = unit_get_default_cgroup(u))) {
 286                 if (!(t = cgroup_bonding_to_string(cgb)))
 287                         return -ENOMEM;
 288         } else
 289                 t = (char*) "";
 290
 291         success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t);
 292
 293         if (cgb)
 294                 free(t);
 295
 296         return success ? 0 : -ENOMEM;
 297 }
 298
 299 int bus_unit_append_cgroups(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 300         Unit *u = data;
 301         CGroupBonding *cgb;
 302         DBusMessageIter sub;
 303
 304         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
 305                 return -ENOMEM;
 306
 307         LIST_FOREACH(by_unit, cgb, u->meta.cgroup_bondings) {
 308                 char *t;
 309                 bool success;
 310
 311                 if (!(t = cgroup_bonding_to_string(cgb)))
 312                         return -ENOMEM;
 313
 314                 success = dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t);
 315                 free(t);
 316
 317                 if (!success)
 318                         return -ENOMEM;
 319         }
 320
 321         if (!dbus_message_iter_close_container(i, &sub))
 322                 return -ENOMEM;
 323
 324         return 0;
 325 }
 326
 327 int bus_unit_append_need_daemon_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 328         Unit *u = data;
 329         dbus_bool_t b;
 330
 331         assert(m);
 332         assert(i);
 333         assert(property);
 334         assert(u);
 335
 336         b = unit_need_daemon_reload(u);
 337
 338         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 339                 return -ENOMEM;
 340
 341         return 0;
 342 }
 343
 344 static DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusConnection *connection, DBusMessage *message) {
 345         DBusMessage *reply = NULL;
 346         Manager *m = u->meta.manager;
 347         DBusError error;
 348         JobType job_type = _JOB_TYPE_INVALID;
 349         char *path = NULL;
 350         bool reload_if_possible = false;
 351
 352         dbus_error_init(&error);
 353
 354         if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Start"))
 355                 job_type = JOB_START;
 356         else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Stop"))
 357                 job_type = JOB_STOP;
 358         else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Reload"))
 359                 job_type = JOB_RELOAD;
 360         else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Restart"))
 361                 job_type = JOB_RESTART;
 362         else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "TryRestart"))
 363                 job_type = JOB_TRY_RESTART;
 364         else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrRestart")) {
 365                 reload_if_possible = true;
 366                 job_type = JOB_RESTART;
 367         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrTryRestart")) {
 368                 reload_if_possible = true;
 369                 job_type = JOB_TRY_RESTART;
 370         } else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ResetFailed")) {
 371
 372                 unit_reset_failed(u);
 373
 374                 if (!(reply = dbus_message_new_method_return(message)))
 375                         goto oom;
 376
 377         } else if (UNIT_VTABLE(u)->bus_message_handler)
 378                 return UNIT_VTABLE(u)->bus_message_handler(u, connection, message);
 379         else
 380                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 381
 382         if (job_type != _JOB_TYPE_INVALID) {
 383                 const char *smode;
 384                 JobMode mode;
 385                 Job *j;
 386                 int r;
 387
 388                 if ((job_type == JOB_START && u->meta.refuse_manual_start) ||
 389                     (job_type == JOB_STOP && u->meta.refuse_manual_stop) ||
 390                     ((job_type == JOB_RESTART || job_type == JOB_TRY_RESTART) &&
 391                      (u->meta.refuse_manual_start || u->meta.refuse_manual_stop))) {
 392                         dbus_set_error(&error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, may be requested by dependency only.");
 393                         return bus_send_error_reply(m, connection, message, &error, -EPERM);
 394                 }
 395
 396                 if (!dbus_message_get_args(
 397                                     message,
 398                                     &error,
 399                                     DBUS_TYPE_STRING, &smode,
 400                                     DBUS_TYPE_INVALID))
 401                         return bus_send_error_reply(m, connection, message, &error, -EINVAL);
 402
 403                 if (reload_if_possible && unit_can_reload(u)) {
 404                         if (job_type == JOB_RESTART)
 405                                 job_type = JOB_RELOAD_OR_START;
 406                         else if (job_type == JOB_TRY_RESTART)
 407                                 job_type = JOB_RELOAD;
 408                 }
 409
 410                 if ((mode = job_mode_from_string(smode)) == _JOB_MODE_INVALID) {
 411                         dbus_set_error(&error, BUS_ERROR_INVALID_JOB_MODE, "Job mode %s is invalid.", smode);
 412                         return bus_send_error_reply(m, connection, message, &error, -EINVAL);
 413                 }
 414
 415                 if ((r = manager_add_job(m, job_type, u, mode, true, &error, &j)) < 0)
 416                         return bus_send_error_reply(m, connection, message, &error, r);
 417
 418                 if (!(reply = dbus_message_new_method_return(message)))
 419                         goto oom;
 420
 421                 if (!(path = job_dbus_path(j)))
 422                         goto oom;
 423
 424                 if (!dbus_message_append_args(
 425                                     reply,
 426                                     DBUS_TYPE_OBJECT_PATH, &path,
 427                                     DBUS_TYPE_INVALID))
 428                         goto oom;
 429         }
 430
 431         free(path);
 432
 433         if (reply) {
 434                 if (!dbus_connection_send(connection, reply, NULL))
 435                         goto oom;
 436
 437                 dbus_message_unref(reply);
 438         }
 439
 440         return DBUS_HANDLER_RESULT_HANDLED;
 441
 442 oom:
 443         free(path);
 444
 445         if (reply)
 446                 dbus_message_unref(reply);
 447
 448         dbus_error_free(&error);
 449
 450         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 451 }
 452
 453 static DBusHandlerResult bus_unit_message_handler(DBusConnection *connection, DBusMessage  *message, void *data) {
 454         Manager *m = data;
 455         Unit *u;
 456         int r;
 457
 458         assert(connection);
 459         assert(message);
 460         assert(m);
 461
 462         if ((r = manager_get_unit_from_dbus_path(m, dbus_message_get_path(message), &u)) < 0) {
 463
 464                 if (r == -ENOMEM)
 465                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 466
 467                 if (r == -ENOENT)
 468                         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 469
 470                 return bus_send_error_reply(m, connection, message, NULL, r);
 471         }
 472
 473         return bus_unit_message_dispatch(u, connection, message);
 474 }
 475
 476 const DBusObjectPathVTable bus_unit_vtable = {
 477         .message_function = bus_unit_message_handler
 478 };
 479
 480 void bus_unit_send_change_signal(Unit *u) {
 481         char *p = NULL;
 482         DBusMessage *m = NULL;
 483
 484         assert(u);
 485
 486         if (u->meta.in_dbus_queue) {
 487                 LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
 488                 u->meta.in_dbus_queue = false;
 489         }
 490
 491         if (!u->meta.id)
 492                 return;
 493
 494         if (!bus_has_subscriber(u->meta.manager)) {
 495                 u->meta.sent_dbus_new_signal = true;
 496                 return;
 497         }
 498
 499         if (!(p = unit_dbus_path(u)))
 500                 goto oom;
 501
 502         if (u->meta.sent_dbus_new_signal) {
 503                 /* Send a properties changed signal. First for the
 504                  * specific type, then for the generic unit. The
 505                  * clients may rely on this order to get atomic
 506                  * behaviour if needed. */
 507
 508                 if (UNIT_VTABLE(u)->bus_invalidating_properties) {
 509
 510                         if (!(m = bus_properties_changed_new(p,
 511                                                              UNIT_VTABLE(u)->bus_interface,
 512                                                              UNIT_VTABLE(u)->bus_invalidating_properties)))
 513                                 goto oom;
 514
 515                         if (bus_broadcast(u->meta.manager, m) < 0)
 516                                 goto oom;
 517
 518                         dbus_message_unref(m);
 519                 }
 520
 521                 if (!(m = bus_properties_changed_new(p, "org.freedesktop.systemd1.Unit", INVALIDATING_PROPERTIES)))
 522                         goto oom;
 523
 524         } else {
 525                 /* Send a new signal */
 526
 527                 if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitNew")))
 528                         goto oom;
 529
 530                 if (!dbus_message_append_args(m,
 531                                               DBUS_TYPE_STRING, &u->meta.id,
 532                                               DBUS_TYPE_OBJECT_PATH, &p,
 533                                               DBUS_TYPE_INVALID))
 534                         goto oom;
 535         }
 536
 537         if (bus_broadcast(u->meta.manager, m) < 0)
 538                 goto oom;
 539
 540         free(p);
 541         dbus_message_unref(m);
 542
 543         u->meta.sent_dbus_new_signal = true;
 544
 545         return;
 546
 547 oom:
 548         free(p);
 549
 550         if (m)
 551                 dbus_message_unref(m);
 552
 553         log_error("Failed to allocate unit change/new signal.");
 554 }
 555
 556 void bus_unit_send_removed_signal(Unit *u) {
 557         char *p = NULL;
 558         DBusMessage *m = NULL;
 559
 560         assert(u);
 561
 562         if (!bus_has_subscriber(u->meta.manager))
 563                 return;
 564
 565         if (!u->meta.sent_dbus_new_signal)
 566                 bus_unit_send_change_signal(u);
 567
 568         if (!u->meta.id)
 569                 return;
 570
 571         if (!(p = unit_dbus_path(u)))
 572                 goto oom;
 573
 574         if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitRemoved")))
 575                 goto oom;
 576
 577         if (!dbus_message_append_args(m,
 578                                       DBUS_TYPE_STRING, &u->meta.id,
 579                                       DBUS_TYPE_OBJECT_PATH, &p,
 580                                       DBUS_TYPE_INVALID))
 581                 goto oom;
 582
 583         if (bus_broadcast(u->meta.manager, m) < 0)
 584                 goto oom;
 585
 586         free(p);
 587         dbus_message_unref(m);
 588
 589         return;
 590
 591 oom:
 592         free(p);
 593
 594         if (m)
 595                 dbus_message_unref(m);
 596
 597         log_error("Failed to allocate unit remove signal.");
 598 }