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