src/dbus.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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 <sys/epoll.h>
  23 #include <sys/timerfd.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <dbus/dbus.h>
  27
  28 #include "dbus.h"
  29 #include "log.h"
  30 #include "strv.h"
  31 #include "cgroup.h"
  32 #include "dbus-unit.h"
  33 #include "dbus-job.h"
  34 #include "dbus-manager.h"
  35 #include "dbus-service.h"
  36 #include "dbus-socket.h"
  37 #include "dbus-target.h"
  38 #include "dbus-device.h"
  39 #include "dbus-mount.h"
  40 #include "dbus-automount.h"
  41 #include "dbus-snapshot.h"
  42 #include "dbus-swap.h"
  43 #include "dbus-timer.h"
  44 #include "dbus-path.h"
  45
  46 static const char bus_properties_interface[] = BUS_PROPERTIES_INTERFACE;
  47 static const char bus_introspectable_interface[] = BUS_INTROSPECTABLE_INTERFACE;
  48
  49 const char *const bus_interface_table[] = {
  50         "org.freedesktop.DBus.Properties",     bus_properties_interface,
  51         "org.freedesktop.DBus.Introspectable", bus_introspectable_interface,
  52         "org.freedesktop.systemd1.Manager",    bus_manager_interface,
  53         "org.freedesktop.systemd1.Job",        bus_job_interface,
  54         "org.freedesktop.systemd1.Unit",       bus_unit_interface,
  55         "org.freedesktop.systemd1.Service",    bus_service_interface,
  56         "org.freedesktop.systemd1.Socket",     bus_socket_interface,
  57         "org.freedesktop.systemd1.Target",     bus_target_interface,
  58         "org.freedesktop.systemd1.Device",     bus_device_interface,
  59         "org.freedesktop.systemd1.Mount",      bus_mount_interface,
  60         "org.freedesktop.systemd1.Automount",  bus_automount_interface,
  61         "org.freedesktop.systemd1.Snapshot",   bus_snapshot_interface,
  62         "org.freedesktop.systemd1.Swap",       bus_swap_interface,
  63         "org.freedesktop.systemd1.Timer",      bus_timer_interface,
  64         "org.freedesktop.systemd1.Path",       bus_path_interface,
  65         NULL
  66 };
  67
  68 static void api_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
  69         Manager *m = data;
  70
  71         assert(bus);
  72         assert(m);
  73
  74         if (!m->api_bus)
  75                 return;
  76
  77         assert(m->api_bus == bus);
  78
  79         m->request_api_bus_dispatch = status != DBUS_DISPATCH_COMPLETE;
  80 }
  81
  82 static void system_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
  83         Manager *m = data;
  84
  85         assert(bus);
  86         assert(m);
  87
  88         if (!m->system_bus)
  89                 return;
  90
  91         assert(m->system_bus == bus);
  92
  93         m->request_system_bus_dispatch = status != DBUS_DISPATCH_COMPLETE;
  94 }
  95
  96 static uint32_t bus_flags_to_events(DBusWatch *bus_watch) {
  97         unsigned flags;
  98         uint32_t events = 0;
  99
 100         assert(bus_watch);
 101
 102         /* no watch flags for disabled watches */
 103         if (!dbus_watch_get_enabled(bus_watch))
 104                 return 0;
 105
 106         flags = dbus_watch_get_flags(bus_watch);
 107
 108         if (flags & DBUS_WATCH_READABLE)
 109                 events |= EPOLLIN;
 110         if (flags & DBUS_WATCH_WRITABLE)
 111                 events |= EPOLLOUT;
 112
 113         return events | EPOLLHUP | EPOLLERR;
 114 }
 115
 116 static unsigned events_to_bus_flags(uint32_t events) {
 117         unsigned flags = 0;
 118
 119         if (events & EPOLLIN)
 120                 flags |= DBUS_WATCH_READABLE;
 121         if (events & EPOLLOUT)
 122                 flags |= DBUS_WATCH_WRITABLE;
 123         if (events & EPOLLHUP)
 124                 flags |= DBUS_WATCH_HANGUP;
 125         if (events & EPOLLERR)
 126                 flags |= DBUS_WATCH_ERROR;
 127
 128         return flags;
 129 }
 130
 131 void bus_watch_event(Manager *m, Watch *w, int events) {
 132         assert(m);
 133         assert(w);
 134
 135         /* This is called by the event loop whenever there is
 136          * something happening on D-Bus' file handles. */
 137
 138         if (!dbus_watch_get_enabled(w->data.bus_watch))
 139                 return;
 140
 141         dbus_watch_handle(w->data.bus_watch, events_to_bus_flags(events));
 142 }
 143
 144 static dbus_bool_t bus_add_watch(DBusWatch *bus_watch, void *data) {
 145         Manager *m = data;
 146         Watch *w;
 147         struct epoll_event ev;
 148
 149         assert(bus_watch);
 150         assert(m);
 151
 152         if (!(w = new0(Watch, 1)))
 153                 return FALSE;
 154
 155         w->fd = dbus_watch_get_unix_fd(bus_watch);
 156         w->type = WATCH_DBUS_WATCH;
 157         w->data.bus_watch = bus_watch;
 158
 159         zero(ev);
 160         ev.events = bus_flags_to_events(bus_watch);
 161         ev.data.ptr = w;
 162
 163         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
 164
 165                 if (errno != EEXIST) {
 166                         free(w);
 167                         return FALSE;
 168                 }
 169
 170                 /* Hmm, bloody D-Bus creates multiple watches on the
 171                  * same fd. epoll() does not like that. As a dirty
 172                  * hack we simply dup() the fd and hence get a second
 173                  * one we can safely add to the epoll(). */
 174
 175                 if ((w->fd = dup(w->fd)) < 0) {
 176                         free(w);
 177                         return FALSE;
 178                 }
 179
 180                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
 181                         free(w);
 182                         close_nointr_nofail(w->fd);
 183                         return FALSE;
 184                 }
 185
 186                 w->fd_is_dupped = true;
 187         }
 188
 189         dbus_watch_set_data(bus_watch, w, NULL);
 190
 191         return TRUE;
 192 }
 193
 194 static void bus_remove_watch(DBusWatch *bus_watch, void *data) {
 195         Manager *m = data;
 196         Watch *w;
 197
 198         assert(bus_watch);
 199         assert(m);
 200
 201         if (!(w = dbus_watch_get_data(bus_watch)))
 202                 return;
 203
 204         assert(w->type == WATCH_DBUS_WATCH);
 205         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 206
 207         if (w->fd_is_dupped)
 208                 close_nointr_nofail(w->fd);
 209
 210         free(w);
 211 }
 212
 213 static void bus_toggle_watch(DBusWatch *bus_watch, void *data) {
 214         Manager *m = data;
 215         Watch *w;
 216         struct epoll_event ev;
 217
 218         assert(bus_watch);
 219         assert(m);
 220
 221         assert_se(w = dbus_watch_get_data(bus_watch));
 222         assert(w->type == WATCH_DBUS_WATCH);
 223
 224         zero(ev);
 225         ev.events = bus_flags_to_events(bus_watch);
 226         ev.data.ptr = w;
 227
 228         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_MOD, w->fd, &ev) == 0);
 229 }
 230
 231 static int bus_timeout_arm(Manager *m, Watch *w) {
 232         struct itimerspec its;
 233
 234         assert(m);
 235         assert(w);
 236
 237         zero(its);
 238
 239         if (dbus_timeout_get_enabled(w->data.bus_timeout)) {
 240                 timespec_store(&its.it_value, dbus_timeout_get_interval(w->data.bus_timeout) * USEC_PER_MSEC);
 241                 its.it_interval = its.it_interval;
 242         }
 243
 244         if (timerfd_settime(w->fd, 0, &its, NULL) < 0)
 245                 return -errno;
 246
 247         return 0;
 248 }
 249
 250 void bus_timeout_event(Manager *m, Watch *w, int events) {
 251         assert(m);
 252         assert(w);
 253
 254         /* This is called by the event loop whenever there is
 255          * something happening on D-Bus' file handles. */
 256
 257         if (!(dbus_timeout_get_enabled(w->data.bus_timeout)))
 258                 return;
 259
 260         dbus_timeout_handle(w->data.bus_timeout);
 261 }
 262
 263 static dbus_bool_t bus_add_timeout(DBusTimeout *timeout, void *data) {
 264         Manager *m = data;
 265         Watch *w;
 266         struct epoll_event ev;
 267
 268         assert(timeout);
 269         assert(m);
 270
 271         if (!(w = new0(Watch, 1)))
 272                 return FALSE;
 273
 274         if (!(w->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
 275                 goto fail;
 276
 277         w->type = WATCH_DBUS_TIMEOUT;
 278         w->data.bus_timeout = timeout;
 279
 280         if (bus_timeout_arm(m, w) < 0)
 281                 goto fail;
 282
 283         zero(ev);
 284         ev.events = EPOLLIN;
 285         ev.data.ptr = w;
 286
 287         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0)
 288                 goto fail;
 289
 290         dbus_timeout_set_data(timeout, w, NULL);
 291
 292         return TRUE;
 293
 294 fail:
 295         if (w->fd >= 0)
 296                 close_nointr_nofail(w->fd);
 297
 298         free(w);
 299         return FALSE;
 300 }
 301
 302 static void bus_remove_timeout(DBusTimeout *timeout, void *data) {
 303         Manager *m = data;
 304         Watch *w;
 305
 306         assert(timeout);
 307         assert(m);
 308
 309         if (!(w = dbus_timeout_get_data(timeout)))
 310                 return;
 311
 312         assert(w->type == WATCH_DBUS_TIMEOUT);
 313         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 314         close_nointr_nofail(w->fd);
 315         free(w);
 316 }
 317
 318 static void bus_toggle_timeout(DBusTimeout *timeout, void *data) {
 319         Manager *m = data;
 320         Watch *w;
 321         int r;
 322
 323         assert(timeout);
 324         assert(m);
 325
 326         assert_se(w = dbus_timeout_get_data(timeout));
 327         assert(w->type == WATCH_DBUS_TIMEOUT);
 328
 329         if ((r = bus_timeout_arm(m, w)) < 0)
 330                 log_error("Failed to rearm timer: %s", strerror(-r));
 331 }
 332
 333 static DBusHandlerResult api_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
 334         Manager *m = data;
 335         DBusError error;
 336
 337         assert(connection);
 338         assert(message);
 339         assert(m);
 340
 341         dbus_error_init(&error);
 342
 343         /* log_debug("Got D-Bus request: %s.%s() on %s", */
 344         /*           dbus_message_get_interface(message), */
 345         /*           dbus_message_get_member(message), */
 346         /*           dbus_message_get_path(message)); */
 347
 348         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 349                 log_error("Warning! API D-Bus connection terminated.");
 350                 bus_done_api(m);
 351
 352         } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
 353                 const char *name, *old_owner, *new_owner;
 354
 355                 if (!dbus_message_get_args(message, &error,
 356                                            DBUS_TYPE_STRING, &name,
 357                                            DBUS_TYPE_STRING, &old_owner,
 358                                            DBUS_TYPE_STRING, &new_owner,
 359                                            DBUS_TYPE_INVALID))
 360                         log_error("Failed to parse NameOwnerChanged message: %s", error.message);
 361                 else  {
 362                         if (set_remove(m->subscribed, (char*) name))
 363                                 log_debug("Subscription client vanished: %s (left: %u)", name, set_size(m->subscribed));
 364
 365                         if (old_owner[0] == 0)
 366                                 old_owner = NULL;
 367
 368                         if (new_owner[0] == 0)
 369                                 new_owner = NULL;
 370
 371                         manager_dispatch_bus_name_owner_changed(m, name, old_owner, new_owner);
 372                 }
 373         }
 374
 375         dbus_error_free(&error);
 376         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 377 }
 378
 379 static DBusHandlerResult system_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
 380         Manager *m = data;
 381         DBusError error;
 382
 383         assert(connection);
 384         assert(message);
 385         assert(m);
 386
 387         dbus_error_init(&error);
 388
 389         /* log_debug("Got D-Bus request: %s.%s() on %s", */
 390         /*           dbus_message_get_interface(message), */
 391         /*           dbus_message_get_member(message), */
 392         /*           dbus_message_get_path(message)); */
 393
 394         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 395                 log_error("Warning! System D-Bus connection terminated.");
 396                 bus_done_system(m);
 397
 398         } if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
 399                 const char *cgroup;
 400
 401                 if (!dbus_message_get_args(message, &error,
 402                                            DBUS_TYPE_STRING, &cgroup,
 403                                            DBUS_TYPE_INVALID))
 404                         log_error("Failed to parse Released message: %s", error.message);
 405                 else
 406                         cgroup_notify_empty(m, cgroup);
 407         }
 408
 409         dbus_error_free(&error);
 410         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 411 }
 412
 413 unsigned bus_dispatch(Manager *m) {
 414         assert(m);
 415
 416         if (m->queued_message) {
 417                 /* If we cannot get rid of this message we won't
 418                  * dispatch any D-Bus messages, so that we won't end
 419                  * up wanting to queue another message. */
 420
 421                 if (!dbus_connection_send(m->api_bus, m->queued_message, NULL))
 422                         return 0;
 423
 424                 dbus_message_unref(m->queued_message);
 425                 m->queued_message = NULL;
 426         }
 427
 428         if (m->request_api_bus_dispatch) {
 429                 if (dbus_connection_dispatch(m->api_bus) == DBUS_DISPATCH_COMPLETE)
 430                         m->request_api_bus_dispatch = false;
 431
 432                 return 1;
 433         }
 434
 435         if (m->request_system_bus_dispatch) {
 436                 if (dbus_connection_dispatch(m->system_bus) == DBUS_DISPATCH_COMPLETE)
 437                         m->request_system_bus_dispatch = false;
 438
 439                 return 1;
 440         }
 441
 442         return 0;
 443 }
 444
 445 static void request_name_pending_cb(DBusPendingCall *pending, void *userdata) {
 446         DBusMessage *reply;
 447         DBusError error;
 448
 449         dbus_error_init(&error);
 450
 451         assert_se(reply = dbus_pending_call_steal_reply(pending));
 452
 453         switch (dbus_message_get_type(reply)) {
 454
 455         case DBUS_MESSAGE_TYPE_ERROR:
 456
 457                 assert_se(dbus_set_error_from_message(&error, reply));
 458                 log_warning("RequestName() failed: %s", error.message);
 459                 break;
 460
 461         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 462                 uint32_t r;
 463
 464                 if (!dbus_message_get_args(reply,
 465                                            &error,
 466                                            DBUS_TYPE_UINT32, &r,
 467                                            DBUS_TYPE_INVALID)) {
 468                         log_error("Failed to parse RequestName() reply: %s", error.message);
 469                         break;
 470                 }
 471
 472                 if (r == 1)
 473                         log_debug("Successfully acquired name.");
 474                 else
 475                         log_error("Name already owned.");
 476
 477                 break;
 478         }
 479
 480         default:
 481                 assert_not_reached("Invalid reply message");
 482         }
 483
 484         dbus_message_unref(reply);
 485         dbus_error_free(&error);
 486 }
 487
 488 static int request_name(Manager *m) {
 489         const char *name = "org.freedesktop.systemd1";
 490         uint32_t flags = 0;
 491         DBusMessage *message = NULL;
 492         DBusPendingCall *pending = NULL;
 493
 494         if (!(message = dbus_message_new_method_call(
 495                               DBUS_SERVICE_DBUS,
 496                               DBUS_PATH_DBUS,
 497                               DBUS_INTERFACE_DBUS,
 498                               "RequestName")))
 499                 goto oom;
 500
 501         if (!dbus_message_append_args(
 502                             message,
 503                             DBUS_TYPE_STRING, &name,
 504                             DBUS_TYPE_UINT32, &flags,
 505                             DBUS_TYPE_INVALID))
 506                 goto oom;
 507
 508         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
 509                 goto oom;
 510
 511         if (!dbus_pending_call_set_notify(pending, request_name_pending_cb, m, NULL))
 512                 goto oom;
 513
 514         dbus_message_unref(message);
 515         dbus_pending_call_unref(pending);
 516
 517         /* We simple ask for the name and don't wait for it. Sooner or
 518          * later we'll have it. */
 519
 520         return 0;
 521
 522 oom:
 523         if (pending) {
 524                 dbus_pending_call_cancel(pending);
 525                 dbus_pending_call_unref(pending);
 526         }
 527
 528         if (message)
 529                 dbus_message_unref(message);
 530
 531         return -ENOMEM;
 532 }
 533
 534 static int bus_setup_loop(Manager *m, DBusConnection *bus) {
 535         assert(m);
 536         assert(bus);
 537
 538         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 539
 540         if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 541             !dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL))
 542                 return -ENOMEM;
 543
 544         return 0;
 545 }
 546
 547 int bus_init_system(Manager *m) {
 548         DBusError error;
 549         char *id;
 550         int r;
 551
 552         assert(m);
 553
 554         dbus_error_init(&error);
 555
 556         if (m->system_bus)
 557                 return 0;
 558
 559         if (m->running_as != MANAGER_SESSION && m->api_bus)
 560                 m->system_bus = m->api_bus;
 561         else {
 562                 if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
 563                         log_debug("Failed to get system D-Bus connection, retrying later: %s", error.message);
 564                         dbus_error_free(&error);
 565                         return 0;
 566                 }
 567
 568                 dbus_connection_set_dispatch_status_function(m->system_bus, system_bus_dispatch_status, m, NULL);
 569                 m->request_system_bus_dispatch = true;
 570
 571                 if ((r = bus_setup_loop(m, m->system_bus)) < 0) {
 572                         bus_done_system(m);
 573                         return r;
 574                 }
 575         }
 576
 577         if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) {
 578                 bus_done_system(m);
 579                 return -ENOMEM;
 580         }
 581
 582         dbus_bus_add_match(m->system_bus,
 583                            "type='signal',"
 584                            "interface='org.freedesktop.systemd1.Agent',"
 585                            "path='/org/freedesktop/systemd1/agent'",
 586                            &error);
 587
 588         if (dbus_error_is_set(&error)) {
 589                 log_error("Failed to register match: %s", error.message);
 590                 dbus_error_free(&error);
 591                 bus_done_system(m);
 592                 return -ENOMEM;
 593         }
 594
 595         log_debug("Successfully connected to system D-Bus bus %s as %s",
 596                   strnull((id = dbus_connection_get_server_id(m->system_bus))),
 597                   strnull(dbus_bus_get_unique_name(m->system_bus)));
 598         dbus_free(id);
 599
 600         return 0;
 601 }
 602
 603 int bus_init_api(Manager *m) {
 604         DBusError error;
 605         char *id;
 606         int r;
 607
 608         assert(m);
 609
 610         dbus_error_init(&error);
 611
 612         if (m->api_bus)
 613                 return 0;
 614
 615         if (m->name_data_slot < 0)
 616                 if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot))
 617                         return -ENOMEM;
 618
 619         if (m->running_as != MANAGER_SESSION && m->system_bus)
 620                 m->api_bus = m->system_bus;
 621         else {
 622                 if (!(m->api_bus = dbus_bus_get_private(m->running_as == MANAGER_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
 623                         log_debug("Failed to get API D-Bus connection, retrying later: %s", error.message);
 624                         dbus_error_free(&error);
 625                         return 0;
 626                 }
 627
 628                 dbus_connection_set_dispatch_status_function(m->api_bus, api_bus_dispatch_status, m, NULL);
 629                 m->request_api_bus_dispatch = true;
 630
 631                 if ((r = bus_setup_loop(m, m->api_bus)) < 0) {
 632                         bus_done_api(m);
 633                         return r;
 634                 }
 635         }
 636
 637         if (!dbus_connection_register_object_path(m->api_bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
 638             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
 639             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
 640             !dbus_connection_add_filter(m->api_bus, api_bus_message_filter, m, NULL)) {
 641                 bus_done_api(m);
 642                 return -ENOMEM;
 643         }
 644
 645         dbus_bus_add_match(m->api_bus,
 646                            "type='signal',"
 647                            "sender='"DBUS_SERVICE_DBUS"',"
 648                            "interface='"DBUS_INTERFACE_DBUS"',"
 649                            "path='"DBUS_PATH_DBUS"'",
 650                            &error);
 651
 652         if (dbus_error_is_set(&error)) {
 653                 log_error("Failed to register match: %s", error.message);
 654                 dbus_error_free(&error);
 655                 bus_done_api(m);
 656                 return -ENOMEM;
 657         }
 658
 659         if ((r = request_name(m)) < 0) {
 660                 bus_done_api(m);
 661                 return r;
 662         }
 663
 664         log_debug("Successfully connected to API D-Bus bus %s as %s",
 665                   strnull((id = dbus_connection_get_server_id(m->api_bus))),
 666                   strnull(dbus_bus_get_unique_name(m->api_bus)));
 667         dbus_free(id);
 668
 669         if (!m->subscribed)
 670                 if (!(m->subscribed = set_new(string_hash_func, string_compare_func)))
 671                         return -ENOMEM;
 672
 673         return 0;
 674 }
 675
 676 void bus_done_api(Manager *m) {
 677         assert(m);
 678
 679         if (m->api_bus) {
 680                 if (m->system_bus == m->api_bus)
 681                         m->system_bus = NULL;
 682
 683                 dbus_connection_set_dispatch_status_function(m->api_bus, NULL, NULL, NULL);
 684                 dbus_connection_flush(m->api_bus);
 685                 dbus_connection_close(m->api_bus);
 686                 dbus_connection_unref(m->api_bus);
 687                 m->api_bus = NULL;
 688         }
 689
 690         if (m->subscribed) {
 691                 char *c;
 692
 693                 while ((c = set_steal_first(m->subscribed)))
 694                         free(c);
 695
 696                 set_free(m->subscribed);
 697                 m->subscribed = NULL;
 698         }
 699
 700        if (m->name_data_slot >= 0)
 701                dbus_pending_call_free_data_slot(&m->name_data_slot);
 702
 703        if (m->queued_message) {
 704                dbus_message_unref(m->queued_message);
 705                m->queued_message = NULL;
 706        }
 707 }
 708
 709 void bus_done_system(Manager *m) {
 710         assert(m);
 711
 712         if (m->system_bus == m->api_bus)
 713                 bus_done_api(m);
 714
 715         if (m->system_bus) {
 716                 dbus_connection_set_dispatch_status_function(m->system_bus, NULL, NULL, NULL);
 717                 dbus_connection_flush(m->system_bus);
 718                 dbus_connection_close(m->system_bus);
 719                 dbus_connection_unref(m->system_bus);
 720                 m->system_bus = NULL;
 721         }
 722 }
 723
 724 static void query_pid_pending_cb(DBusPendingCall *pending, void *userdata) {
 725         Manager *m = userdata;
 726         DBusMessage *reply;
 727         DBusError error;
 728         const char *name;
 729
 730         dbus_error_init(&error);
 731
 732         assert_se(name = dbus_pending_call_get_data(pending, m->name_data_slot));
 733         assert_se(reply = dbus_pending_call_steal_reply(pending));
 734
 735         switch (dbus_message_get_type(reply)) {
 736
 737         case DBUS_MESSAGE_TYPE_ERROR:
 738
 739                 assert_se(dbus_set_error_from_message(&error, reply));
 740                 log_warning("GetConnectionUnixProcessID() failed: %s", error.message);
 741                 break;
 742
 743         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 744                 uint32_t r;
 745
 746                 if (!dbus_message_get_args(reply,
 747                                            &error,
 748                                            DBUS_TYPE_UINT32, &r,
 749                                            DBUS_TYPE_INVALID)) {
 750                         log_error("Failed to parse GetConnectionUnixProcessID() reply: %s", error.message);
 751                         break;
 752                 }
 753
 754                 manager_dispatch_bus_query_pid_done(m, name, (pid_t) r);
 755                 break;
 756         }
 757
 758         default:
 759                 assert_not_reached("Invalid reply message");
 760         }
 761
 762         dbus_message_unref(reply);
 763         dbus_error_free(&error);
 764 }
 765
 766 int bus_query_pid(Manager *m, const char *name) {
 767         DBusMessage *message = NULL;
 768         DBusPendingCall *pending = NULL;
 769         char *n = NULL;
 770
 771         assert(m);
 772         assert(name);
 773
 774         if (!(message = dbus_message_new_method_call(
 775                               DBUS_SERVICE_DBUS,
 776                               DBUS_PATH_DBUS,
 777                               DBUS_INTERFACE_DBUS,
 778                               "GetConnectionUnixProcessID")))
 779                 goto oom;
 780
 781         if (!(dbus_message_append_args(
 782                               message,
 783                               DBUS_TYPE_STRING, &name,
 784                               DBUS_TYPE_INVALID)))
 785                 goto oom;
 786
 787         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
 788                 goto oom;
 789
 790         if (!(n = strdup(name)))
 791                 goto oom;
 792
 793         if (!dbus_pending_call_set_data(pending, m->name_data_slot, n, free))
 794                 goto oom;
 795
 796         n = NULL;
 797
 798         if (!dbus_pending_call_set_notify(pending, query_pid_pending_cb, m, NULL))
 799                 goto oom;
 800
 801         dbus_message_unref(message);
 802         dbus_pending_call_unref(pending);
 803
 804         return 0;
 805
 806 oom:
 807         free(n);
 808
 809         if (pending) {
 810                 dbus_pending_call_cancel(pending);
 811                 dbus_pending_call_unref(pending);
 812         }
 813
 814         if (message)
 815                 dbus_message_unref(message);
 816
 817         return -ENOMEM;
 818 }
 819
 820 DBusHandlerResult bus_default_message_handler(Manager *m, DBusMessage *message, const char*introspection, const BusProperty *properties) {
 821         DBusError error;
 822         DBusMessage *reply = NULL;
 823         int r;
 824
 825         assert(m);
 826         assert(message);
 827
 828         dbus_error_init(&error);
 829
 830         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
 831
 832                 if (!(reply = dbus_message_new_method_return(message)))
 833                         goto oom;
 834
 835                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
 836                         goto oom;
 837
 838         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
 839                 const char *interface, *property;
 840                 const BusProperty *p;
 841
 842                 if (!dbus_message_get_args(
 843                             message,
 844                             &error,
 845                             DBUS_TYPE_STRING, &interface,
 846                             DBUS_TYPE_STRING, &property,
 847                             DBUS_TYPE_INVALID))
 848                         return bus_send_error_reply(m, message, &error, -EINVAL);
 849
 850                 for (p = properties; p->property; p++)
 851                         if (streq(p->interface, interface) && streq(p->property, property))
 852                                 break;
 853
 854                 if (p->property) {
 855                         DBusMessageIter iter, sub;
 856
 857                         if (!(reply = dbus_message_new_method_return(message)))
 858                                 goto oom;
 859
 860                         dbus_message_iter_init_append(reply, &iter);
 861
 862                         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
 863                                 goto oom;
 864
 865                         if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) {
 866
 867                                 if (r == -ENOMEM)
 868                                         goto oom;
 869
 870                                 dbus_message_unref(reply);
 871                                 return bus_send_error_reply(m, message, NULL, r);
 872                         }
 873
 874                         if (!dbus_message_iter_close_container(&iter, &sub))
 875                                 goto oom;
 876                 }
 877         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
 878                 const char *interface;
 879                 const BusProperty *p;
 880                 DBusMessageIter iter, sub, sub2, sub3;
 881                 bool any = false;
 882
 883                 if (!dbus_message_get_args(
 884                             message,
 885                             &error,
 886                             DBUS_TYPE_STRING, &interface,
 887                             DBUS_TYPE_INVALID))
 888                         return bus_send_error_reply(m, message, &error, -EINVAL);
 889
 890                 if (!(reply = dbus_message_new_method_return(message)))
 891                         goto oom;
 892
 893                 dbus_message_iter_init_append(reply, &iter);
 894
 895                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
 896                         goto oom;
 897
 898                 for (p = properties; p->property; p++) {
 899                         if (!streq(p->interface, interface))
 900                                 continue;
 901
 902                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
 903                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
 904                             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
 905                                 goto oom;
 906
 907                         if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) {
 908
 909                                 if (r == -ENOMEM)
 910                                         goto oom;
 911
 912                                 dbus_message_unref(reply);
 913                                 return bus_send_error_reply(m, message, NULL, r);
 914                         }
 915
 916                         if (!dbus_message_iter_close_container(&sub2, &sub3) ||
 917                             !dbus_message_iter_close_container(&sub, &sub2))
 918                                 goto oom;
 919
 920                         any = true;
 921                 }
 922
 923                 if (!dbus_message_iter_close_container(&iter, &sub))
 924                         goto oom;
 925         }
 926
 927         if (reply) {
 928                 if (!dbus_connection_send(m->api_bus, reply, NULL))
 929                         goto oom;
 930
 931                 dbus_message_unref(reply);
 932                 return DBUS_HANDLER_RESULT_HANDLED;
 933         }
 934
 935         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 936
 937 oom:
 938         if (reply)
 939                 dbus_message_unref(reply);
 940
 941         dbus_error_free(&error);
 942
 943         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 944 }
 945
 946 static const char *error_to_dbus(int error) {
 947
 948         switch(error) {
 949
 950         case -EINVAL:
 951                 return DBUS_ERROR_INVALID_ARGS;
 952
 953         case -ENOMEM:
 954                 return DBUS_ERROR_NO_MEMORY;
 955
 956         case -EPERM:
 957         case -EACCES:
 958                 return DBUS_ERROR_ACCESS_DENIED;
 959
 960         case -ESRCH:
 961                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
 962
 963         case -ENOENT:
 964                 return DBUS_ERROR_FILE_NOT_FOUND;
 965
 966         case -EEXIST:
 967                 return DBUS_ERROR_FILE_EXISTS;
 968
 969         case -ETIMEDOUT:
 970                 return DBUS_ERROR_TIMEOUT;
 971
 972         case -EIO:
 973                 return DBUS_ERROR_IO_ERROR;
 974
 975         case -ENETRESET:
 976         case -ECONNABORTED:
 977         case -ECONNRESET:
 978                 return DBUS_ERROR_DISCONNECTED;
 979         }
 980
 981         return DBUS_ERROR_FAILED;
 982 }
 983
 984 DBusHandlerResult bus_send_error_reply(Manager *m, DBusMessage *message, DBusError *bus_error, int error) {
 985         DBusMessage *reply = NULL;
 986         const char *name, *text;
 987
 988         if (bus_error && dbus_error_is_set(bus_error)) {
 989                 name = bus_error->name;
 990                 text = bus_error->message;
 991         } else {
 992                 name = error_to_dbus(error);
 993                 text = strerror(-error);
 994         }
 995
 996         if (!(reply = dbus_message_new_error(message, name, text)))
 997                 goto oom;
 998
 999         if (!dbus_connection_send(m->api_bus, reply, NULL))
1000                 goto oom;
1001
1002         dbus_message_unref(reply);
1003
1004         if (bus_error)
1005                 dbus_error_free(bus_error);
1006
1007         return DBUS_HANDLER_RESULT_HANDLED;
1008
1009 oom:
1010         if (reply)
1011                 dbus_message_unref(reply);
1012
1013         if (bus_error)
1014                 dbus_error_free(bus_error);
1015
1016         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1017 }
1018
1019 int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1020         const char *t = data;
1021
1022         assert(m);
1023         assert(i);
1024         assert(property);
1025
1026         if (!t)
1027                 t = "";
1028
1029         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
1030                 return -ENOMEM;
1031
1032         return 0;
1033 }
1034
1035 int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1036         DBusMessageIter sub;
1037         char **t = data;
1038
1039         assert(m);
1040         assert(i);
1041         assert(property);
1042
1043         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
1044                 return -ENOMEM;
1045
1046         STRV_FOREACH(t, t)
1047                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
1048                         return -ENOMEM;
1049
1050         if (!dbus_message_iter_close_container(i, &sub))
1051                 return -ENOMEM;
1052
1053         return 0;
1054 }
1055
1056 int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1057         bool *b = data;
1058         dbus_bool_t db;
1059
1060         assert(m);
1061         assert(i);
1062         assert(property);
1063         assert(b);
1064
1065         db = *b;
1066
1067         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
1068                 return -ENOMEM;
1069
1070         return 0;
1071 }
1072
1073 int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1074         assert(m);
1075         assert(i);
1076         assert(property);
1077         assert(data);
1078
1079         /* Let's ensure that pid_t is actually 64bit, and hence this
1080          * function can be used for usec_t */
1081         assert_cc(sizeof(uint64_t) == sizeof(usec_t));
1082
1083         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
1084                 return -ENOMEM;
1085
1086         return 0;
1087 }
1088
1089 int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1090         assert(m);
1091         assert(i);
1092         assert(property);
1093         assert(data);
1094
1095         /* Let's ensure that pid_t and mode_t is actually 32bit, and
1096          * hence this function can be used for pid_t/mode_t */
1097         assert_cc(sizeof(uint32_t) == sizeof(pid_t));
1098         assert_cc(sizeof(uint32_t) == sizeof(mode_t));
1099         assert_cc(sizeof(uint32_t) == sizeof(unsigned));
1100
1101         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
1102                 return -ENOMEM;
1103
1104         return 0;
1105 }
1106
1107 int bus_property_append_int32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1108         assert(m);
1109         assert(i);
1110         assert(property);
1111         assert(data);
1112
1113         assert_cc(sizeof(int32_t) == sizeof(int));
1114
1115         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data))
1116                 return -ENOMEM;
1117
1118         return 0;
1119 }
1120
1121 int bus_parse_strv(DBusMessage *m, char ***_l) {
1122         DBusMessageIter iter, sub;
1123         unsigned n = 0, i = 0;
1124         char **l;
1125
1126         assert(m);
1127         assert(_l);
1128
1129         if (!dbus_message_iter_init(m, &iter) ||
1130             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
1131             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
1132             return -EINVAL;
1133
1134         dbus_message_iter_recurse(&iter, &sub);
1135
1136         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1137                 n++;
1138                 dbus_message_iter_next(&sub);
1139         }
1140
1141         if (!(l = new(char*, n+1)))
1142                 return -ENOMEM;
1143
1144         assert_se(dbus_message_iter_init(m, &iter));
1145         dbus_message_iter_recurse(&iter, &sub);
1146
1147         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1148                 const char *s;
1149
1150                 assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
1151                 dbus_message_iter_get_basic(&sub, &s);
1152
1153                 if (!(l[i++] = strdup(s))) {
1154                         strv_free(l);
1155                         return -ENOMEM;
1156                 }
1157
1158                 dbus_message_iter_next(&sub);
1159         }
1160
1161         assert(i == n);
1162         l[i] = NULL;
1163
1164         if (_l)
1165                 *_l = l;
1166
1167         return 0;
1168 }