src/dbus.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 <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 #include "bus-errors.h"
  46 #include "special.h"
  47
  48 #define CONNECTIONS_MAX 52
  49
  50 static const char bus_properties_interface[] = BUS_PROPERTIES_INTERFACE;
  51 static const char bus_introspectable_interface[] = BUS_INTROSPECTABLE_INTERFACE;
  52
  53 const char *const bus_interface_table[] = {
  54         "org.freedesktop.DBus.Properties",     bus_properties_interface,
  55         "org.freedesktop.DBus.Introspectable", bus_introspectable_interface,
  56         "org.freedesktop.systemd1.Manager",    bus_manager_interface,
  57         "org.freedesktop.systemd1.Job",        bus_job_interface,
  58         "org.freedesktop.systemd1.Unit",       bus_unit_interface,
  59         "org.freedesktop.systemd1.Service",    bus_service_interface,
  60         "org.freedesktop.systemd1.Socket",     bus_socket_interface,
  61         "org.freedesktop.systemd1.Target",     bus_target_interface,
  62         "org.freedesktop.systemd1.Device",     bus_device_interface,
  63         "org.freedesktop.systemd1.Mount",      bus_mount_interface,
  64         "org.freedesktop.systemd1.Automount",  bus_automount_interface,
  65         "org.freedesktop.systemd1.Snapshot",   bus_snapshot_interface,
  66         "org.freedesktop.systemd1.Swap",       bus_swap_interface,
  67         "org.freedesktop.systemd1.Timer",      bus_timer_interface,
  68         "org.freedesktop.systemd1.Path",       bus_path_interface,
  69         NULL
  70 };
  71
  72 static const char *error_to_dbus(int error);
  73 static void bus_done_api(Manager *m);
  74 static void bus_done_system(Manager *m);
  75 static void bus_done_private(Manager *m);
  76 static void shutdown_connection(Manager *m, DBusConnection *c);
  77
  78 static void bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
  79         Manager *m = data;
  80
  81         assert(bus);
  82         assert(m);
  83
  84         /* We maintain two sets, one for those connections where we
  85          * requested a dispatch, and another where we didn't. And then,
  86          * we move the connections between the two sets. */
  87
  88         if (status == DBUS_DISPATCH_COMPLETE)
  89                 set_move_one(m->bus_connections, m->bus_connections_for_dispatch, bus);
  90         else
  91                 set_move_one(m->bus_connections_for_dispatch, m->bus_connections, bus);
  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         DBusMessage *reply = NULL;
 335
 336         assert(connection);
 337         assert(message);
 338         assert(m);
 339
 340         dbus_error_init(&error);
 341
 342         if (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL ||
 343             dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_SIGNAL)
 344                 log_debug("Got D-Bus request: %s.%s() on %s",
 345                           dbus_message_get_interface(message),
 346                           dbus_message_get_member(message),
 347                           dbus_message_get_path(message));
 348
 349         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 350                 log_debug("API D-Bus connection terminated.");
 351                 bus_done_api(m);
 352
 353         } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
 354                 const char *name, *old_owner, *new_owner;
 355
 356                 if (!dbus_message_get_args(message, &error,
 357                                            DBUS_TYPE_STRING, &name,
 358                                            DBUS_TYPE_STRING, &old_owner,
 359                                            DBUS_TYPE_STRING, &new_owner,
 360                                            DBUS_TYPE_INVALID))
 361                         log_error("Failed to parse NameOwnerChanged message: %s", error.message);
 362                 else  {
 363                         if (set_remove(BUS_CONNECTION_SUBSCRIBED(m, connection), (char*) name))
 364                                 log_debug("Subscription client vanished: %s (left: %u)", name, set_size(BUS_CONNECTION_SUBSCRIBED(m, connection)));
 365
 366                         if (old_owner[0] == 0)
 367                                 old_owner = NULL;
 368
 369                         if (new_owner[0] == 0)
 370                                 new_owner = NULL;
 371
 372                         manager_dispatch_bus_name_owner_changed(m, name, old_owner, new_owner);
 373                 }
 374         } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Activator", "ActivationRequest")) {
 375                 const char *name;
 376
 377                 if (!dbus_message_get_args(message, &error,
 378                                            DBUS_TYPE_STRING, &name,
 379                                            DBUS_TYPE_INVALID))
 380                         log_error("Failed to parse ActivationRequest message: %s", error.message);
 381                 else  {
 382                         int r;
 383                         Unit *u;
 384
 385                         log_debug("Got D-Bus activation request for %s", name);
 386
 387                         if (manager_unit_pending_inactive(m, SPECIAL_DBUS_SERVICE) ||
 388                             manager_unit_pending_inactive(m, SPECIAL_DBUS_SOCKET)) {
 389                                 r = -EADDRNOTAVAIL;
 390                                 dbus_set_error(&error, BUS_ERROR_SHUTTING_DOWN, "Refusing activation, D-Bus is shutting down.");
 391                         } else {
 392                                 r = manager_load_unit(m, name, NULL, &error, &u);
 393
 394                                 if (r >= 0 && u->meta.refuse_manual_start)
 395                                         r = -EPERM;
 396
 397                                 if (r >= 0)
 398                                         r = manager_add_job(m, JOB_START, u, JOB_REPLACE, true, &error, NULL);
 399                         }
 400
 401                         if (r < 0) {
 402                                 const char *id, *text;
 403
 404                                 log_debug("D-Bus activation failed for %s: %s", name, strerror(-r));
 405
 406                                 if (!(reply = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Activator", "ActivationFailure")))
 407                                         goto oom;
 408
 409                                 id = error.name ? error.name : error_to_dbus(r);
 410                                 text = bus_error(&error, r);
 411
 412                                 if (!dbus_message_set_destination(reply, DBUS_SERVICE_DBUS) ||
 413                                     !dbus_message_append_args(reply,
 414                                                               DBUS_TYPE_STRING, &name,
 415                                                               DBUS_TYPE_STRING, &id,
 416                                                               DBUS_TYPE_STRING, &text,
 417                                                               DBUS_TYPE_INVALID))
 418                                         goto oom;
 419                         }
 420
 421                         /* On success we don't do anything, the service will be spawned now */
 422                 }
 423         }
 424
 425         dbus_error_free(&error);
 426
 427         if (reply) {
 428                 if (!dbus_connection_send(connection, reply, NULL))
 429                         goto oom;
 430
 431                 dbus_message_unref(reply);
 432         }
 433
 434         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 435
 436 oom:
 437         if (reply)
 438                 dbus_message_unref(reply);
 439
 440         dbus_error_free(&error);
 441
 442         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 443 }
 444
 445 static DBusHandlerResult system_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) {
 446         Manager *m = data;
 447         DBusError error;
 448
 449         assert(connection);
 450         assert(message);
 451         assert(m);
 452
 453         dbus_error_init(&error);
 454
 455         if (m->api_bus != m->system_bus &&
 456             (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL ||
 457              dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_SIGNAL))
 458                 log_debug("Got D-Bus request on system bus: %s.%s() on %s",
 459                           dbus_message_get_interface(message),
 460                           dbus_message_get_member(message),
 461                           dbus_message_get_path(message));
 462
 463         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 464                 log_debug("System D-Bus connection terminated.");
 465                 bus_done_system(m);
 466
 467         } else if (m->running_as != MANAGER_SYSTEM &&
 468                    dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
 469
 470                 const char *cgroup;
 471
 472                 if (!dbus_message_get_args(message, &error,
 473                                            DBUS_TYPE_STRING, &cgroup,
 474                                            DBUS_TYPE_INVALID))
 475                         log_error("Failed to parse Released message: %s", error.message);
 476                 else
 477                         cgroup_notify_empty(m, cgroup);
 478         }
 479
 480         dbus_error_free(&error);
 481         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 482 }
 483
 484 static DBusHandlerResult private_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) {
 485         Manager *m = data;
 486         DBusError error;
 487
 488         assert(connection);
 489         assert(message);
 490         assert(m);
 491
 492         dbus_error_init(&error);
 493
 494         if (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL ||
 495             dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_SIGNAL)
 496                 log_debug("Got D-Bus request: %s.%s() on %s",
 497                           dbus_message_get_interface(message),
 498                           dbus_message_get_member(message),
 499                           dbus_message_get_path(message));
 500
 501         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected"))
 502                 shutdown_connection(m, connection);
 503         else if (m->running_as == MANAGER_SYSTEM &&
 504                  dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
 505
 506                 const char *cgroup;
 507
 508                 if (!dbus_message_get_args(message, &error,
 509                                            DBUS_TYPE_STRING, &cgroup,
 510                                            DBUS_TYPE_INVALID))
 511                         log_error("Failed to parse Released message: %s", error.message);
 512                 else
 513                         cgroup_notify_empty(m, cgroup);
 514
 515                 /* Forward the message to the system bus, so that user
 516                  * instances are notified as well */
 517
 518                 if (m->system_bus)
 519                         dbus_connection_send(m->system_bus, message, NULL);
 520         }
 521
 522         dbus_error_free(&error);
 523
 524         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 525 }
 526
 527 unsigned bus_dispatch(Manager *m) {
 528         DBusConnection *c;
 529
 530         assert(m);
 531
 532         if (m->queued_message) {
 533                 /* If we cannot get rid of this message we won't
 534                  * dispatch any D-Bus messages, so that we won't end
 535                  * up wanting to queue another message. */
 536
 537                 if (m->queued_message_connection)
 538                         if (!dbus_connection_send(m->queued_message_connection, m->queued_message, NULL))
 539                                 return 0;
 540
 541                 dbus_message_unref(m->queued_message);
 542                 m->queued_message = NULL;
 543                 m->queued_message_connection = NULL;
 544         }
 545
 546         if ((c = set_first(m->bus_connections_for_dispatch))) {
 547                 if (dbus_connection_dispatch(c) == DBUS_DISPATCH_COMPLETE)
 548                         set_move_one(m->bus_connections, m->bus_connections_for_dispatch, c);
 549
 550                 return 1;
 551         }
 552
 553         return 0;
 554 }
 555
 556 static void request_name_pending_cb(DBusPendingCall *pending, void *userdata) {
 557         DBusMessage *reply;
 558         DBusError error;
 559
 560         dbus_error_init(&error);
 561
 562         assert_se(reply = dbus_pending_call_steal_reply(pending));
 563
 564         switch (dbus_message_get_type(reply)) {
 565
 566         case DBUS_MESSAGE_TYPE_ERROR:
 567
 568                 assert_se(dbus_set_error_from_message(&error, reply));
 569                 log_warning("RequestName() failed: %s", error.message);
 570                 break;
 571
 572         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 573                 uint32_t r;
 574
 575                 if (!dbus_message_get_args(reply,
 576                                            &error,
 577                                            DBUS_TYPE_UINT32, &r,
 578                                            DBUS_TYPE_INVALID)) {
 579                         log_error("Failed to parse RequestName() reply: %s", error.message);
 580                         break;
 581                 }
 582
 583                 if (r == 1)
 584                         log_debug("Successfully acquired name.");
 585                 else
 586                         log_error("Name already owned.");
 587
 588                 break;
 589         }
 590
 591         default:
 592                 assert_not_reached("Invalid reply message");
 593         }
 594
 595         dbus_message_unref(reply);
 596         dbus_error_free(&error);
 597 }
 598
 599 static int request_name(Manager *m) {
 600         const char *name = "org.freedesktop.systemd1";
 601         uint32_t flags = 0;
 602         DBusMessage *message = NULL;
 603         DBusPendingCall *pending = NULL;
 604
 605         if (!(message = dbus_message_new_method_call(
 606                               DBUS_SERVICE_DBUS,
 607                               DBUS_PATH_DBUS,
 608                               DBUS_INTERFACE_DBUS,
 609                               "RequestName")))
 610                 goto oom;
 611
 612         if (!dbus_message_append_args(
 613                             message,
 614                             DBUS_TYPE_STRING, &name,
 615                             DBUS_TYPE_UINT32, &flags,
 616                             DBUS_TYPE_INVALID))
 617                 goto oom;
 618
 619         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
 620                 goto oom;
 621
 622         if (!dbus_pending_call_set_notify(pending, request_name_pending_cb, m, NULL))
 623                 goto oom;
 624
 625         dbus_message_unref(message);
 626         dbus_pending_call_unref(pending);
 627
 628         /* We simple ask for the name and don't wait for it. Sooner or
 629          * later we'll have it. */
 630
 631         return 0;
 632
 633 oom:
 634         if (pending) {
 635                 dbus_pending_call_cancel(pending);
 636                 dbus_pending_call_unref(pending);
 637         }
 638
 639         if (message)
 640                 dbus_message_unref(message);
 641
 642         return -ENOMEM;
 643 }
 644
 645 static void query_name_list_pending_cb(DBusPendingCall *pending, void *userdata) {
 646         DBusMessage *reply;
 647         DBusError error;
 648         Manager *m = userdata;
 649
 650         assert(m);
 651
 652         dbus_error_init(&error);
 653
 654         assert_se(reply = dbus_pending_call_steal_reply(pending));
 655
 656         switch (dbus_message_get_type(reply)) {
 657
 658         case DBUS_MESSAGE_TYPE_ERROR:
 659
 660                 assert_se(dbus_set_error_from_message(&error, reply));
 661                 log_warning("ListNames() failed: %s", error.message);
 662                 break;
 663
 664         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 665                 int r;
 666                 char **l;
 667
 668                 if ((r = bus_parse_strv(reply, &l)) < 0)
 669                         log_warning("Failed to parse ListNames() reply: %s", strerror(-r));
 670                 else {
 671                         char **t;
 672
 673                         STRV_FOREACH(t, l)
 674                                 /* This is a bit hacky, we say the
 675                                  * owner of the name is the name
 676                                  * itself, because we don't want the
 677                                  * extra traffic to figure out the
 678                                  * real owner. */
 679                                 manager_dispatch_bus_name_owner_changed(m, *t, NULL, *t);
 680
 681                         strv_free(l);
 682                 }
 683
 684                 break;
 685         }
 686
 687         default:
 688                 assert_not_reached("Invalid reply message");
 689         }
 690
 691         dbus_message_unref(reply);
 692         dbus_error_free(&error);
 693 }
 694
 695 static int query_name_list(Manager *m) {
 696         DBusMessage *message = NULL;
 697         DBusPendingCall *pending = NULL;
 698
 699         /* Asks for the currently installed bus names */
 700
 701         if (!(message = dbus_message_new_method_call(
 702                               DBUS_SERVICE_DBUS,
 703                               DBUS_PATH_DBUS,
 704                               DBUS_INTERFACE_DBUS,
 705                               "ListNames")))
 706                 goto oom;
 707
 708         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
 709                 goto oom;
 710
 711         if (!dbus_pending_call_set_notify(pending, query_name_list_pending_cb, m, NULL))
 712                 goto oom;
 713
 714         dbus_message_unref(message);
 715         dbus_pending_call_unref(pending);
 716
 717         /* We simple ask for the list and don't wait for it. Sooner or
 718          * later we'll get it. */
 719
 720         return 0;
 721
 722 oom:
 723         if (pending) {
 724                 dbus_pending_call_cancel(pending);
 725                 dbus_pending_call_unref(pending);
 726         }
 727
 728         if (message)
 729                 dbus_message_unref(message);
 730
 731         return -ENOMEM;
 732 }
 733
 734 static int bus_setup_loop(Manager *m, DBusConnection *bus) {
 735         assert(m);
 736         assert(bus);
 737
 738         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 739
 740         if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 741             !dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL)) {
 742                 log_error("Not enough memory");
 743                 return -ENOMEM;
 744         }
 745
 746         if (set_put(m->bus_connections_for_dispatch, bus) < 0) {
 747                 log_error("Not enough memory");
 748                 return -ENOMEM;
 749         }
 750
 751         dbus_connection_set_dispatch_status_function(bus, bus_dispatch_status, m, NULL);
 752         return 0;
 753 }
 754
 755 static dbus_bool_t allow_only_root(DBusConnection *connection, unsigned long uid, void *data) {
 756         return uid == 0;
 757 }
 758
 759 static void bus_new_connection(
 760                 DBusServer *server,
 761                 DBusConnection *new_connection,
 762                 void *data) {
 763
 764         Manager *m = data;
 765
 766         assert(m);
 767
 768         if (set_size(m->bus_connections) >= CONNECTIONS_MAX) {
 769                 log_error("Too many concurrent connections.");
 770                 return;
 771         }
 772
 773         dbus_connection_set_unix_user_function(new_connection, allow_only_root, NULL, NULL);
 774
 775         if (bus_setup_loop(m, new_connection) < 0)
 776                 return;
 777
 778         if (!dbus_connection_register_object_path(new_connection, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
 779             !dbus_connection_register_fallback(new_connection, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
 780             !dbus_connection_register_fallback(new_connection, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
 781             !dbus_connection_add_filter(new_connection, private_bus_message_filter, m, NULL)) {
 782                 log_error("Not enough memory.");
 783                 return;
 784         }
 785
 786         log_debug("Accepted connection on private bus.");
 787
 788         dbus_connection_ref(new_connection);
 789 }
 790
 791 static int bus_init_system(Manager *m) {
 792         DBusError error;
 793         int r;
 794
 795         assert(m);
 796
 797         dbus_error_init(&error);
 798
 799         if (m->system_bus)
 800                 return 0;
 801
 802         if (m->running_as == MANAGER_SYSTEM && m->api_bus)
 803                 m->system_bus = m->api_bus;
 804         else {
 805                 if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
 806                         log_debug("Failed to get system D-Bus connection, retrying later: %s", error.message);
 807                         r = 0;
 808                         goto fail;
 809                 }
 810
 811                 if ((r = bus_setup_loop(m, m->system_bus)) < 0)
 812                         goto fail;
 813         }
 814
 815         if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) {
 816                 log_error("Not enough memory");
 817                 r = -EIO;
 818                 goto fail;
 819         }
 820
 821         if (m->running_as != MANAGER_SYSTEM) {
 822                 dbus_bus_add_match(m->system_bus,
 823                                    "type='signal',"
 824                                    "interface='org.freedesktop.systemd1.Agent',"
 825                                    "member='Released',"
 826                                    "path='/org/freedesktop/systemd1/agent'",
 827                                    &error);
 828
 829                 if (dbus_error_is_set(&error)) {
 830                         log_error("Failed to register match: %s", error.message);
 831                         r = -EIO;
 832                         goto fail;
 833                 }
 834         }
 835
 836         if (m->api_bus != m->system_bus) {
 837                 char *id;
 838                 log_debug("Successfully connected to system D-Bus bus %s as %s",
 839                          strnull((id = dbus_connection_get_server_id(m->system_bus))),
 840                          strnull(dbus_bus_get_unique_name(m->system_bus)));
 841                 dbus_free(id);
 842         }
 843
 844         return 0;
 845
 846 fail:
 847         bus_done_system(m);
 848         dbus_error_free(&error);
 849
 850         return r;
 851 }
 852
 853 static int bus_init_api(Manager *m) {
 854         DBusError error;
 855         int r;
 856
 857         assert(m);
 858
 859         dbus_error_init(&error);
 860
 861         if (m->api_bus)
 862                 return 0;
 863
 864         if (m->running_as == MANAGER_SYSTEM && m->system_bus)
 865                 m->api_bus = m->system_bus;
 866         else {
 867                 if (!(m->api_bus = dbus_bus_get_private(m->running_as == MANAGER_USER ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
 868                         log_debug("Failed to get API D-Bus connection, retrying later: %s", error.message);
 869                         r = 0;
 870                         goto fail;
 871                 }
 872
 873                 if ((r = bus_setup_loop(m, m->api_bus)) < 0)
 874                         goto fail;
 875         }
 876
 877         if (!dbus_connection_register_object_path(m->api_bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
 878             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
 879             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
 880             !dbus_connection_add_filter(m->api_bus, api_bus_message_filter, m, NULL)) {
 881                 log_error("Not enough memory");
 882                 r = -ENOMEM;
 883                 goto fail;
 884         }
 885
 886         /* Get NameOwnerChange messages */
 887         dbus_bus_add_match(m->api_bus,
 888                            "type='signal',"
 889                            "sender='"DBUS_SERVICE_DBUS"',"
 890                            "interface='"DBUS_INTERFACE_DBUS"',"
 891                            "member='NameOwnerChanged',"
 892                            "path='"DBUS_PATH_DBUS"'",
 893                            &error);
 894
 895         if (dbus_error_is_set(&error)) {
 896                 log_error("Failed to register match: %s", error.message);
 897                 r = -EIO;
 898                 goto fail;
 899         }
 900
 901         /* Get activation requests */
 902         dbus_bus_add_match(m->api_bus,
 903                            "type='signal',"
 904                            "sender='"DBUS_SERVICE_DBUS"',"
 905                            "interface='org.freedesktop.systemd1.Activator',"
 906                            "member='ActivationRequest',"
 907                            "path='"DBUS_PATH_DBUS"'",
 908                            &error);
 909
 910         if (dbus_error_is_set(&error)) {
 911                 log_error("Failed to register match: %s", error.message);
 912                 r = -EIO;
 913                 goto fail;
 914         }
 915
 916         if ((r = request_name(m)) < 0)
 917                 goto fail;
 918
 919         if ((r = query_name_list(m)) < 0)
 920                 goto fail;
 921
 922         if (m->api_bus != m->system_bus) {
 923                 char *id;
 924                 log_debug("Successfully connected to API D-Bus bus %s as %s",
 925                          strnull((id = dbus_connection_get_server_id(m->api_bus))),
 926                          strnull(dbus_bus_get_unique_name(m->api_bus)));
 927                 dbus_free(id);
 928         }
 929
 930         return 0;
 931
 932 fail:
 933         bus_done_api(m);
 934         dbus_error_free(&error);
 935
 936         return r;
 937 }
 938
 939 static int bus_init_private(Manager *m) {
 940         DBusError error;
 941         int r;
 942         const char *const external_only[] = {
 943                 "EXTERNAL",
 944                 NULL
 945         };
 946
 947         assert(m);
 948
 949         dbus_error_init(&error);
 950
 951         if (m->private_bus)
 952                 return 0;
 953
 954         /* We want the private bus only when running as init */
 955         if (getpid() != 1)
 956                 return 0;
 957
 958         if (!(m->private_bus = dbus_server_listen("unix:abstract=/org/freedesktop/systemd1/private", &error))) {
 959                 log_error("Failed to create private D-Bus server: %s", error.message);
 960                 r = -EIO;
 961                 goto fail;
 962         }
 963
 964         if (!dbus_server_set_auth_mechanisms(m->private_bus, (const char**) external_only) ||
 965             !dbus_server_set_watch_functions(m->private_bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 966             !dbus_server_set_timeout_functions(m->private_bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL)) {
 967                 log_error("Not enough memory");
 968                 r = -ENOMEM;
 969                 goto fail;
 970         }
 971
 972         dbus_server_set_new_connection_function(m->private_bus, bus_new_connection, m, NULL);
 973
 974         log_debug("Successfully created private D-Bus server.");
 975
 976         return 0;
 977
 978 fail:
 979         bus_done_private(m);
 980         dbus_error_free(&error);
 981
 982         return r;
 983 }
 984
 985 int bus_init(Manager *m, bool try_bus_connect) {
 986         int r;
 987
 988         if (set_ensure_allocated(&m->bus_connections, trivial_hash_func, trivial_compare_func) < 0 ||
 989             set_ensure_allocated(&m->bus_connections_for_dispatch, trivial_hash_func, trivial_compare_func) < 0) {
 990                 log_error("Not enough memory");
 991                 return -ENOMEM;
 992         }
 993
 994         if (m->name_data_slot < 0)
 995                 if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot)) {
 996                         log_error("Not enough memory");
 997                         return -ENOMEM;
 998                 }
 999
1000         if (m->subscribed_data_slot < 0)
1001                 if (!dbus_connection_allocate_data_slot(&m->subscribed_data_slot)) {
1002                         log_error("Not enough memory");
1003                         return -ENOMEM;
1004                 }
1005
1006         if (try_bus_connect) {
1007                 if ((r = bus_init_system(m)) < 0 ||
1008                     (r = bus_init_api(m)) < 0)
1009                         return r;
1010         }
1011
1012         if ((r = bus_init_private(m)) < 0)
1013                 return r;
1014
1015         return 0;
1016 }
1017
1018 static void shutdown_connection(Manager *m, DBusConnection *c) {
1019         Set *s;
1020         Job *j;
1021         Iterator i;
1022
1023         HASHMAP_FOREACH(j, m->jobs, i)
1024                 if (j->bus == c) {
1025                         free(j->bus_client);
1026                         j->bus_client = NULL;
1027
1028                         j->bus = NULL;
1029                 }
1030
1031         set_remove(m->bus_connections, c);
1032         set_remove(m->bus_connections_for_dispatch, c);
1033
1034         if ((s = BUS_CONNECTION_SUBSCRIBED(m, c))) {
1035                 char *t;
1036
1037                 while ((t = set_steal_first(s)))
1038                         free(t);
1039
1040                 set_free(s);
1041         }
1042
1043         if (m->queued_message_connection == c) {
1044                 m->queued_message_connection = NULL;
1045
1046                 if (m->queued_message) {
1047                         dbus_message_unref(m->queued_message);
1048                         m->queued_message = NULL;
1049                 }
1050         }
1051
1052         dbus_connection_set_dispatch_status_function(c, NULL, NULL, NULL);
1053         dbus_connection_flush(c);
1054         dbus_connection_close(c);
1055         dbus_connection_unref(c);
1056 }
1057
1058 static void bus_done_api(Manager *m) {
1059         assert(m);
1060
1061         if (m->api_bus) {
1062                 if (m->system_bus == m->api_bus)
1063                         m->system_bus = NULL;
1064
1065                 shutdown_connection(m, m->api_bus);
1066                 m->api_bus = NULL;
1067         }
1068
1069
1070        if (m->queued_message) {
1071                dbus_message_unref(m->queued_message);
1072                m->queued_message = NULL;
1073        }
1074 }
1075
1076 static void bus_done_system(Manager *m) {
1077         assert(m);
1078
1079         if (m->system_bus == m->api_bus)
1080                 bus_done_api(m);
1081
1082         if (m->system_bus) {
1083                 shutdown_connection(m, m->system_bus);
1084                 m->system_bus = NULL;
1085         }
1086 }
1087
1088 static void bus_done_private(Manager *m) {
1089
1090         if (m->private_bus) {
1091                 dbus_server_disconnect(m->private_bus);
1092                 dbus_server_unref(m->private_bus);
1093                 m->private_bus = NULL;
1094         }
1095 }
1096
1097 void bus_done(Manager *m) {
1098         DBusConnection *c;
1099
1100         bus_done_api(m);
1101         bus_done_system(m);
1102         bus_done_private(m);
1103
1104         while ((c = set_steal_first(m->bus_connections)))
1105                 shutdown_connection(m, c);
1106
1107         while ((c = set_steal_first(m->bus_connections_for_dispatch)))
1108                 shutdown_connection(m, c);
1109
1110         set_free(m->bus_connections);
1111         set_free(m->bus_connections_for_dispatch);
1112
1113         if (m->name_data_slot >= 0)
1114                dbus_pending_call_free_data_slot(&m->name_data_slot);
1115
1116         if (m->subscribed_data_slot >= 0)
1117                 dbus_connection_free_data_slot(&m->subscribed_data_slot);
1118 }
1119
1120 static void query_pid_pending_cb(DBusPendingCall *pending, void *userdata) {
1121         Manager *m = userdata;
1122         DBusMessage *reply;
1123         DBusError error;
1124         const char *name;
1125
1126         dbus_error_init(&error);
1127
1128         assert_se(name = BUS_PENDING_CALL_NAME(m, pending));
1129         assert_se(reply = dbus_pending_call_steal_reply(pending));
1130
1131         switch (dbus_message_get_type(reply)) {
1132
1133         case DBUS_MESSAGE_TYPE_ERROR:
1134
1135                 assert_se(dbus_set_error_from_message(&error, reply));
1136                 log_warning("GetConnectionUnixProcessID() failed: %s", error.message);
1137                 break;
1138
1139         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
1140                 uint32_t r;
1141
1142                 if (!dbus_message_get_args(reply,
1143                                            &error,
1144                                            DBUS_TYPE_UINT32, &r,
1145                                            DBUS_TYPE_INVALID)) {
1146                         log_error("Failed to parse GetConnectionUnixProcessID() reply: %s", error.message);
1147                         break;
1148                 }
1149
1150                 manager_dispatch_bus_query_pid_done(m, name, (pid_t) r);
1151                 break;
1152         }
1153
1154         default:
1155                 assert_not_reached("Invalid reply message");
1156         }
1157
1158         dbus_message_unref(reply);
1159         dbus_error_free(&error);
1160 }
1161
1162 int bus_query_pid(Manager *m, const char *name) {
1163         DBusMessage *message = NULL;
1164         DBusPendingCall *pending = NULL;
1165         char *n = NULL;
1166
1167         assert(m);
1168         assert(name);
1169
1170         if (!(message = dbus_message_new_method_call(
1171                               DBUS_SERVICE_DBUS,
1172                               DBUS_PATH_DBUS,
1173                               DBUS_INTERFACE_DBUS,
1174                               "GetConnectionUnixProcessID")))
1175                 goto oom;
1176
1177         if (!(dbus_message_append_args(
1178                               message,
1179                               DBUS_TYPE_STRING, &name,
1180                               DBUS_TYPE_INVALID)))
1181                 goto oom;
1182
1183         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
1184                 goto oom;
1185
1186         if (!(n = strdup(name)))
1187                 goto oom;
1188
1189         if (!dbus_pending_call_set_data(pending, m->name_data_slot, n, free))
1190                 goto oom;
1191
1192         n = NULL;
1193
1194         if (!dbus_pending_call_set_notify(pending, query_pid_pending_cb, m, NULL))
1195                 goto oom;
1196
1197         dbus_message_unref(message);
1198         dbus_pending_call_unref(pending);
1199
1200         return 0;
1201
1202 oom:
1203         free(n);
1204
1205         if (pending) {
1206                 dbus_pending_call_cancel(pending);
1207                 dbus_pending_call_unref(pending);
1208         }
1209
1210         if (message)
1211                 dbus_message_unref(message);
1212
1213         return -ENOMEM;
1214 }
1215
1216 DBusHandlerResult bus_default_message_handler(Manager *m, DBusConnection *c, DBusMessage *message, const char*introspection, const BusProperty *properties) {
1217         DBusError error;
1218         DBusMessage *reply = NULL;
1219         int r;
1220
1221         assert(m);
1222         assert(message);
1223
1224         dbus_error_init(&error);
1225
1226         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
1227
1228                 if (!(reply = dbus_message_new_method_return(message)))
1229                         goto oom;
1230
1231                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
1232                         goto oom;
1233
1234         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
1235                 const char *interface, *property;
1236                 const BusProperty *p;
1237
1238                 if (!dbus_message_get_args(
1239                             message,
1240                             &error,
1241                             DBUS_TYPE_STRING, &interface,
1242                             DBUS_TYPE_STRING, &property,
1243                             DBUS_TYPE_INVALID))
1244                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1245
1246                 for (p = properties; p->property; p++)
1247                         if (streq(p->interface, interface) && streq(p->property, property))
1248                                 break;
1249
1250                 if (p->property) {
1251                         DBusMessageIter iter, sub;
1252
1253                         if (!(reply = dbus_message_new_method_return(message)))
1254                                 goto oom;
1255
1256                         dbus_message_iter_init_append(reply, &iter);
1257
1258                         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
1259                                 goto oom;
1260
1261                         if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) {
1262
1263                                 if (r == -ENOMEM)
1264                                         goto oom;
1265
1266                                 dbus_message_unref(reply);
1267                                 return bus_send_error_reply(m, c, message, NULL, r);
1268                         }
1269
1270                         if (!dbus_message_iter_close_container(&iter, &sub))
1271                                 goto oom;
1272                 }
1273
1274         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
1275                 const char *interface;
1276                 const BusProperty *p;
1277                 DBusMessageIter iter, sub, sub2, sub3;
1278
1279                 if (!dbus_message_get_args(
1280                             message,
1281                             &error,
1282                             DBUS_TYPE_STRING, &interface,
1283                             DBUS_TYPE_INVALID))
1284                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1285
1286                 if (!(reply = dbus_message_new_method_return(message)))
1287                         goto oom;
1288
1289                 dbus_message_iter_init_append(reply, &iter);
1290
1291                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
1292                         goto oom;
1293
1294                 for (p = properties; p->property; p++) {
1295                         if (interface[0] && !streq(p->interface, interface))
1296                                 continue;
1297
1298                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
1299                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
1300                             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
1301                                 goto oom;
1302
1303                         if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) {
1304
1305                                 if (r == -ENOMEM)
1306                                         goto oom;
1307
1308                                 dbus_message_unref(reply);
1309                                 return bus_send_error_reply(m, c, message, NULL, r);
1310                         }
1311
1312                         if (!dbus_message_iter_close_container(&sub2, &sub3) ||
1313                             !dbus_message_iter_close_container(&sub, &sub2))
1314                                 goto oom;
1315                 }
1316
1317                 if (!dbus_message_iter_close_container(&iter, &sub))
1318                         goto oom;
1319         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Set") && properties) {
1320                 const char *interface, *property;
1321                 DBusMessageIter iter;
1322                 const BusProperty *p;
1323
1324                 if (!dbus_message_iter_init(message, &iter) ||
1325                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
1326                         return bus_send_error_reply(m, c, message, NULL, -EINVAL);
1327
1328                 dbus_message_iter_get_basic(&iter, &interface);
1329
1330                 if (!dbus_message_iter_next(&iter) ||
1331                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
1332                         return bus_send_error_reply(m, c, message, NULL, -EINVAL);
1333
1334                 dbus_message_iter_get_basic(&iter, &property);
1335
1336                 if (!dbus_message_iter_next(&iter) ||
1337                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT ||
1338                     dbus_message_iter_has_next(&iter))
1339                         return bus_send_error_reply(m, c, message, NULL, -EINVAL);
1340
1341                 for (p = properties; p->property; p++)
1342                         if (streq(p->interface, interface) && streq(p->property, property))
1343                                 break;
1344
1345                 if (p->set) {
1346                         DBusMessageIter sub;
1347                         char *sig;
1348
1349                         dbus_message_iter_recurse(&iter, &sub);
1350
1351                         if (!(sig = dbus_message_iter_get_signature(&sub)))
1352                                 goto oom;
1353
1354                         if (!streq(sig, p->signature)) {
1355                                 dbus_free(sig);
1356                                 return bus_send_error_reply(m, c, message, NULL, -EINVAL);
1357                         }
1358
1359                         dbus_free(sig);
1360
1361                         if ((r = p->set(m, &sub, property)) < 0) {
1362                                 if (r == -ENOMEM)
1363                                         goto oom;
1364                                 return bus_send_error_reply(m, c, message, NULL, r);
1365                         }
1366
1367                         if (!(reply = dbus_message_new_method_return(message)))
1368                                 goto oom;
1369                 } else
1370                         return bus_send_error_reply(m, c, message, NULL, -EINVAL);
1371         }
1372
1373         if (reply) {
1374                 if (!dbus_connection_send(c, reply, NULL))
1375                         goto oom;
1376
1377                 dbus_message_unref(reply);
1378                 return DBUS_HANDLER_RESULT_HANDLED;
1379         }
1380
1381         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1382
1383 oom:
1384         if (reply)
1385                 dbus_message_unref(reply);
1386
1387         dbus_error_free(&error);
1388
1389         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1390 }
1391
1392 static const char *error_to_dbus(int error) {
1393
1394         switch(error) {
1395
1396         case -EINVAL:
1397                 return DBUS_ERROR_INVALID_ARGS;
1398
1399         case -ENOMEM:
1400                 return DBUS_ERROR_NO_MEMORY;
1401
1402         case -EPERM:
1403         case -EACCES:
1404                 return DBUS_ERROR_ACCESS_DENIED;
1405
1406         case -ESRCH:
1407                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
1408
1409         case -ENOENT:
1410                 return DBUS_ERROR_FILE_NOT_FOUND;
1411
1412         case -EEXIST:
1413                 return DBUS_ERROR_FILE_EXISTS;
1414
1415         case -ETIMEDOUT:
1416         case -ETIME:
1417                 return DBUS_ERROR_TIMEOUT;
1418
1419         case -EIO:
1420                 return DBUS_ERROR_IO_ERROR;
1421
1422         case -ENETRESET:
1423         case -ECONNABORTED:
1424         case -ECONNRESET:
1425                 return DBUS_ERROR_DISCONNECTED;
1426         }
1427
1428         return DBUS_ERROR_FAILED;
1429 }
1430
1431 DBusHandlerResult bus_send_error_reply(Manager *m, DBusConnection *c, DBusMessage *message, DBusError *berror, int error) {
1432         DBusMessage *reply = NULL;
1433         const char *name, *text;
1434
1435         if (berror && dbus_error_is_set(berror)) {
1436                 name = berror->name;
1437                 text = berror->message;
1438         } else {
1439                 name = error_to_dbus(error);
1440                 text = strerror(-error);
1441         }
1442
1443         if (!(reply = dbus_message_new_error(message, name, text)))
1444                 goto oom;
1445
1446         if (!dbus_connection_send(c, reply, NULL))
1447                 goto oom;
1448
1449         dbus_message_unref(reply);
1450
1451         if (berror)
1452                 dbus_error_free(berror);
1453
1454         return DBUS_HANDLER_RESULT_HANDLED;
1455
1456 oom:
1457         if (reply)
1458                 dbus_message_unref(reply);
1459
1460         if (berror)
1461                 dbus_error_free(berror);
1462
1463         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1464 }
1465
1466 int bus_broadcast(Manager *m, DBusMessage *message) {
1467         bool oom = false;
1468         Iterator i;
1469         DBusConnection *c;
1470
1471         assert(m);
1472         assert(message);
1473
1474         SET_FOREACH(c, m->bus_connections_for_dispatch, i)
1475                 if (c != m->system_bus || m->running_as == MANAGER_SYSTEM)
1476                         oom = !dbus_connection_send(c, message, NULL);
1477
1478         SET_FOREACH(c, m->bus_connections, i)
1479                 if (c != m->system_bus || m->running_as == MANAGER_SYSTEM)
1480                         oom = !dbus_connection_send(c, message, NULL);
1481
1482         return oom ? -ENOMEM : 0;
1483 }
1484
1485 int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1486         const char *t = data;
1487
1488         assert(m);
1489         assert(i);
1490         assert(property);
1491
1492         if (!t)
1493                 t = "";
1494
1495         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
1496                 return -ENOMEM;
1497
1498         return 0;
1499 }
1500
1501 int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1502         DBusMessageIter sub;
1503         char **t = data;
1504
1505         assert(m);
1506         assert(i);
1507         assert(property);
1508
1509         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
1510                 return -ENOMEM;
1511
1512         STRV_FOREACH(t, t)
1513                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
1514                         return -ENOMEM;
1515
1516         if (!dbus_message_iter_close_container(i, &sub))
1517                 return -ENOMEM;
1518
1519         return 0;
1520 }
1521
1522 int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1523         bool *b = data;
1524         dbus_bool_t db;
1525
1526         assert(m);
1527         assert(i);
1528         assert(property);
1529         assert(b);
1530
1531         db = *b;
1532
1533         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
1534                 return -ENOMEM;
1535
1536         return 0;
1537 }
1538
1539 int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1540         assert(m);
1541         assert(i);
1542         assert(property);
1543         assert(data);
1544
1545         /* Let's ensure that pid_t is actually 64bit, and hence this
1546          * function can be used for usec_t */
1547         assert_cc(sizeof(uint64_t) == sizeof(usec_t));
1548
1549         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
1550                 return -ENOMEM;
1551
1552         return 0;
1553 }
1554
1555 int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1556         assert(m);
1557         assert(i);
1558         assert(property);
1559         assert(data);
1560
1561         /* Let's ensure that pid_t and mode_t is actually 32bit, and
1562          * hence this function can be used for pid_t/mode_t */
1563         assert_cc(sizeof(uint32_t) == sizeof(pid_t));
1564         assert_cc(sizeof(uint32_t) == sizeof(mode_t));
1565         assert_cc(sizeof(uint32_t) == sizeof(unsigned));
1566
1567         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
1568                 return -ENOMEM;
1569
1570         return 0;
1571 }
1572
1573 int bus_property_append_int32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1574         assert(m);
1575         assert(i);
1576         assert(property);
1577         assert(data);
1578
1579         assert_cc(sizeof(int32_t) == sizeof(int));
1580
1581         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data))
1582                 return -ENOMEM;
1583
1584         return 0;
1585 }
1586
1587 int bus_property_append_size(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1588         uint64_t u;
1589
1590         assert(m);
1591         assert(i);
1592         assert(property);
1593         assert(data);
1594
1595         u = (uint64_t) *(size_t*) data;
1596
1597         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
1598                 return -ENOMEM;
1599
1600         return 0;
1601 }
1602
1603 int bus_property_append_ul(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1604         uint64_t u;
1605
1606         assert(m);
1607         assert(i);
1608         assert(property);
1609         assert(data);
1610
1611         u = (uint64_t) *(unsigned long*) data;
1612
1613         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
1614                 return -ENOMEM;
1615
1616         return 0;
1617 }
1618
1619 int bus_parse_strv(DBusMessage *m, char ***_l) {
1620         DBusMessageIter iter, sub;
1621         unsigned n = 0, i = 0;
1622         char **l;
1623
1624         assert(m);
1625         assert(_l);
1626
1627         if (!dbus_message_iter_init(m, &iter) ||
1628             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
1629             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
1630             return -EINVAL;
1631
1632         dbus_message_iter_recurse(&iter, &sub);
1633
1634         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1635                 n++;
1636                 dbus_message_iter_next(&sub);
1637         }
1638
1639         if (!(l = new(char*, n+1)))
1640                 return -ENOMEM;
1641
1642         assert_se(dbus_message_iter_init(m, &iter));
1643         dbus_message_iter_recurse(&iter, &sub);
1644
1645         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1646                 const char *s;
1647
1648                 assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
1649                 dbus_message_iter_get_basic(&sub, &s);
1650
1651                 if (!(l[i++] = strdup(s))) {
1652                         strv_free(l);
1653                         return -ENOMEM;
1654                 }
1655
1656                 dbus_message_iter_next(&sub);
1657         }
1658
1659         assert(i == n);
1660         l[i] = NULL;
1661
1662         if (_l)
1663                 *_l = l;
1664
1665         return 0;
1666 }
1667
1668 bool bus_has_subscriber(Manager *m) {
1669         Iterator i;
1670         DBusConnection *c;
1671
1672         assert(m);
1673
1674         SET_FOREACH(c, m->bus_connections_for_dispatch, i)
1675                 if (bus_connection_has_subscriber(m, c))
1676                         return true;
1677
1678         SET_FOREACH(c, m->bus_connections, i)
1679                 if (bus_connection_has_subscriber(m, c))
1680                         return true;
1681
1682         return false;
1683 }
1684
1685 bool bus_connection_has_subscriber(Manager *m, DBusConnection *c) {
1686         assert(m);
1687         assert(c);
1688
1689         return !set_isempty(BUS_CONNECTION_SUBSCRIBED(m, c));
1690 }
1691
1692 DBusMessage* bus_properties_changed_new(const char *path, const char *interface, const char *properties) {
1693         DBusMessage *m;
1694         DBusMessageIter iter, sub;
1695         const char *i;
1696
1697         assert(interface);
1698         assert(properties);
1699
1700         if (!(m = dbus_message_new_signal(path, "org.freedesktop.DBus.Properties", "PropertiesChanged")))
1701                 goto oom;
1702
1703         dbus_message_iter_init_append(m, &iter);
1704
1705         /* We won't send any property values, since they might be
1706          * large and sometimes not cheap to generated */
1707
1708         if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &interface) ||
1709             !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub) ||
1710             !dbus_message_iter_close_container(&iter, &sub) ||
1711             !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub))
1712                 goto oom;
1713
1714         NULSTR_FOREACH(i, properties)
1715                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &i))
1716                         goto oom;
1717
1718         if (!dbus_message_iter_close_container(&iter, &sub))
1719                 goto oom;
1720
1721         return m;
1722
1723 oom:
1724         if (m)
1725                 dbus_message_unref(m);
1726
1727         return NULL;
1728 }