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         unlink("/dev/.run/systemd/private");
 959         if (!(m->private_bus = dbus_server_listen("unix:path=/dev/.run/systemd/private", &error))) {
 960                 log_error("Failed to create private D-Bus server: %s", error.message);
 961                 r = -EIO;
 962                 goto fail;
 963         }
 964
 965         if (!dbus_server_set_auth_mechanisms(m->private_bus, (const char**) external_only) ||
 966             !dbus_server_set_watch_functions(m->private_bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 967             !dbus_server_set_timeout_functions(m->private_bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL)) {
 968                 log_error("Not enough memory");
 969                 r = -ENOMEM;
 970                 goto fail;
 971         }
 972
 973         dbus_server_set_new_connection_function(m->private_bus, bus_new_connection, m, NULL);
 974
 975         log_debug("Successfully created private D-Bus server.");
 976
 977         return 0;
 978
 979 fail:
 980         bus_done_private(m);
 981         dbus_error_free(&error);
 982
 983         return r;
 984 }
 985
 986 int bus_init(Manager *m, bool try_bus_connect) {
 987         int r;
 988
 989         if (set_ensure_allocated(&m->bus_connections, trivial_hash_func, trivial_compare_func) < 0 ||
 990             set_ensure_allocated(&m->bus_connections_for_dispatch, trivial_hash_func, trivial_compare_func) < 0) {
 991                 log_error("Not enough memory");
 992                 return -ENOMEM;
 993         }
 994
 995         if (m->name_data_slot < 0)
 996                 if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot)) {
 997                         log_error("Not enough memory");
 998                         return -ENOMEM;
 999                 }
1000
1001         if (m->subscribed_data_slot < 0)
1002                 if (!dbus_connection_allocate_data_slot(&m->subscribed_data_slot)) {
1003                         log_error("Not enough memory");
1004                         return -ENOMEM;
1005                 }
1006
1007         if (try_bus_connect) {
1008                 if ((r = bus_init_system(m)) < 0 ||
1009                     (r = bus_init_api(m)) < 0)
1010                         return r;
1011         }
1012
1013         if ((r = bus_init_private(m)) < 0)
1014                 return r;
1015
1016         return 0;
1017 }
1018
1019 static void shutdown_connection(Manager *m, DBusConnection *c) {
1020         Set *s;
1021         Job *j;
1022         Iterator i;
1023
1024         HASHMAP_FOREACH(j, m->jobs, i)
1025                 if (j->bus == c) {
1026                         free(j->bus_client);
1027                         j->bus_client = NULL;
1028
1029                         j->bus = NULL;
1030                 }
1031
1032         set_remove(m->bus_connections, c);
1033         set_remove(m->bus_connections_for_dispatch, c);
1034
1035         if ((s = BUS_CONNECTION_SUBSCRIBED(m, c))) {
1036                 char *t;
1037
1038                 while ((t = set_steal_first(s)))
1039                         free(t);
1040
1041                 set_free(s);
1042         }
1043
1044         if (m->queued_message_connection == c) {
1045                 m->queued_message_connection = NULL;
1046
1047                 if (m->queued_message) {
1048                         dbus_message_unref(m->queued_message);
1049                         m->queued_message = NULL;
1050                 }
1051         }
1052
1053         dbus_connection_set_dispatch_status_function(c, NULL, NULL, NULL);
1054         dbus_connection_flush(c);
1055         dbus_connection_close(c);
1056         dbus_connection_unref(c);
1057 }
1058
1059 static void bus_done_api(Manager *m) {
1060         assert(m);
1061
1062         if (m->api_bus) {
1063                 if (m->system_bus == m->api_bus)
1064                         m->system_bus = NULL;
1065
1066                 shutdown_connection(m, m->api_bus);
1067                 m->api_bus = NULL;
1068         }
1069
1070
1071        if (m->queued_message) {
1072                dbus_message_unref(m->queued_message);
1073                m->queued_message = NULL;
1074        }
1075 }
1076
1077 static void bus_done_system(Manager *m) {
1078         assert(m);
1079
1080         if (m->system_bus == m->api_bus)
1081                 bus_done_api(m);
1082
1083         if (m->system_bus) {
1084                 shutdown_connection(m, m->system_bus);
1085                 m->system_bus = NULL;
1086         }
1087 }
1088
1089 static void bus_done_private(Manager *m) {
1090
1091         if (m->private_bus) {
1092                 dbus_server_disconnect(m->private_bus);
1093                 dbus_server_unref(m->private_bus);
1094                 m->private_bus = NULL;
1095         }
1096 }
1097
1098 void bus_done(Manager *m) {
1099         DBusConnection *c;
1100
1101         bus_done_api(m);
1102         bus_done_system(m);
1103         bus_done_private(m);
1104
1105         while ((c = set_steal_first(m->bus_connections)))
1106                 shutdown_connection(m, c);
1107
1108         while ((c = set_steal_first(m->bus_connections_for_dispatch)))
1109                 shutdown_connection(m, c);
1110
1111         set_free(m->bus_connections);
1112         set_free(m->bus_connections_for_dispatch);
1113
1114         if (m->name_data_slot >= 0)
1115                dbus_pending_call_free_data_slot(&m->name_data_slot);
1116
1117         if (m->subscribed_data_slot >= 0)
1118                 dbus_connection_free_data_slot(&m->subscribed_data_slot);
1119 }
1120
1121 static void query_pid_pending_cb(DBusPendingCall *pending, void *userdata) {
1122         Manager *m = userdata;
1123         DBusMessage *reply;
1124         DBusError error;
1125         const char *name;
1126
1127         dbus_error_init(&error);
1128
1129         assert_se(name = BUS_PENDING_CALL_NAME(m, pending));
1130         assert_se(reply = dbus_pending_call_steal_reply(pending));
1131
1132         switch (dbus_message_get_type(reply)) {
1133
1134         case DBUS_MESSAGE_TYPE_ERROR:
1135
1136                 assert_se(dbus_set_error_from_message(&error, reply));
1137                 log_warning("GetConnectionUnixProcessID() failed: %s", error.message);
1138                 break;
1139
1140         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
1141                 uint32_t r;
1142
1143                 if (!dbus_message_get_args(reply,
1144                                            &error,
1145                                            DBUS_TYPE_UINT32, &r,
1146                                            DBUS_TYPE_INVALID)) {
1147                         log_error("Failed to parse GetConnectionUnixProcessID() reply: %s", error.message);
1148                         break;
1149                 }
1150
1151                 manager_dispatch_bus_query_pid_done(m, name, (pid_t) r);
1152                 break;
1153         }
1154
1155         default:
1156                 assert_not_reached("Invalid reply message");
1157         }
1158
1159         dbus_message_unref(reply);
1160         dbus_error_free(&error);
1161 }
1162
1163 int bus_query_pid(Manager *m, const char *name) {
1164         DBusMessage *message = NULL;
1165         DBusPendingCall *pending = NULL;
1166         char *n = NULL;
1167
1168         assert(m);
1169         assert(name);
1170
1171         if (!(message = dbus_message_new_method_call(
1172                               DBUS_SERVICE_DBUS,
1173                               DBUS_PATH_DBUS,
1174                               DBUS_INTERFACE_DBUS,
1175                               "GetConnectionUnixProcessID")))
1176                 goto oom;
1177
1178         if (!(dbus_message_append_args(
1179                               message,
1180                               DBUS_TYPE_STRING, &name,
1181                               DBUS_TYPE_INVALID)))
1182                 goto oom;
1183
1184         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
1185                 goto oom;
1186
1187         if (!(n = strdup(name)))
1188                 goto oom;
1189
1190         if (!dbus_pending_call_set_data(pending, m->name_data_slot, n, free))
1191                 goto oom;
1192
1193         n = NULL;
1194
1195         if (!dbus_pending_call_set_notify(pending, query_pid_pending_cb, m, NULL))
1196                 goto oom;
1197
1198         dbus_message_unref(message);
1199         dbus_pending_call_unref(pending);
1200
1201         return 0;
1202
1203 oom:
1204         free(n);
1205
1206         if (pending) {
1207                 dbus_pending_call_cancel(pending);
1208                 dbus_pending_call_unref(pending);
1209         }
1210
1211         if (message)
1212                 dbus_message_unref(message);
1213
1214         return -ENOMEM;
1215 }
1216
1217 DBusHandlerResult bus_default_message_handler(
1218                 Manager *m,
1219                 DBusConnection *c,
1220                 DBusMessage *message,
1221                 const char *introspection,
1222                 const char *interfaces,
1223                 const BusProperty *properties) {
1224
1225         DBusError error;
1226         DBusMessage *reply = NULL;
1227         int r;
1228
1229         assert(m);
1230         assert(c);
1231         assert(message);
1232
1233         dbus_error_init(&error);
1234
1235         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
1236
1237                 if (!(reply = dbus_message_new_method_return(message)))
1238                         goto oom;
1239
1240                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
1241                         goto oom;
1242
1243         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
1244                 const char *interface, *property;
1245                 const BusProperty *p;
1246
1247                 if (!dbus_message_get_args(
1248                             message,
1249                             &error,
1250                             DBUS_TYPE_STRING, &interface,
1251                             DBUS_TYPE_STRING, &property,
1252                             DBUS_TYPE_INVALID))
1253                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1254
1255                 for (p = properties; p->property; p++)
1256                         if (streq(p->interface, interface) && streq(p->property, property))
1257                                 break;
1258
1259                 if (p->property) {
1260                         DBusMessageIter iter, sub;
1261
1262                         if (!(reply = dbus_message_new_method_return(message)))
1263                                 goto oom;
1264
1265                         dbus_message_iter_init_append(reply, &iter);
1266
1267                         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
1268                                 goto oom;
1269
1270                         if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) {
1271
1272                                 if (r == -ENOMEM)
1273                                         goto oom;
1274
1275                                 dbus_message_unref(reply);
1276                                 return bus_send_error_reply(m, c, message, NULL, r);
1277                         }
1278
1279                         if (!dbus_message_iter_close_container(&iter, &sub))
1280                                 goto oom;
1281                 } else {
1282                         if (!nulstr_contains(interfaces, interface))
1283                                 dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface");
1284                         else
1285                                 dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_PROPERTY, "Unknown property");
1286
1287                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1288                 }
1289
1290         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
1291                 const char *interface;
1292                 const BusProperty *p;
1293                 DBusMessageIter iter, sub, sub2, sub3;
1294
1295                 if (!dbus_message_get_args(
1296                             message,
1297                             &error,
1298                             DBUS_TYPE_STRING, &interface,
1299                             DBUS_TYPE_INVALID))
1300                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1301
1302                 if (interface[0] && !nulstr_contains(interfaces, interface)) {
1303                         dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface");
1304                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1305                 }
1306
1307                 if (!(reply = dbus_message_new_method_return(message)))
1308                         goto oom;
1309
1310                 dbus_message_iter_init_append(reply, &iter);
1311
1312                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
1313                         goto oom;
1314
1315                 for (p = properties; p->property; p++) {
1316                         if (interface[0] && !streq(p->interface, interface))
1317                                 continue;
1318
1319                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
1320                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
1321                             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
1322                                 goto oom;
1323
1324                         if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) {
1325
1326                                 if (r == -ENOMEM)
1327                                         goto oom;
1328
1329                                 dbus_message_unref(reply);
1330                                 return bus_send_error_reply(m, c, message, NULL, r);
1331                         }
1332
1333                         if (!dbus_message_iter_close_container(&sub2, &sub3) ||
1334                             !dbus_message_iter_close_container(&sub, &sub2))
1335                                 goto oom;
1336                 }
1337
1338                 if (!dbus_message_iter_close_container(&iter, &sub))
1339                         goto oom;
1340
1341         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Set") && properties) {
1342                 const char *interface, *property;
1343                 DBusMessageIter iter;
1344                 const BusProperty *p;
1345
1346                 if (!dbus_message_iter_init(message, &iter) ||
1347                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
1348                         return bus_send_error_reply(m, c, message, NULL, -EINVAL);
1349
1350                 dbus_message_iter_get_basic(&iter, &interface);
1351
1352                 if (!dbus_message_iter_next(&iter) ||
1353                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
1354                         return bus_send_error_reply(m, c, message, NULL, -EINVAL);
1355
1356                 dbus_message_iter_get_basic(&iter, &property);
1357
1358                 if (!dbus_message_iter_next(&iter) ||
1359                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT ||
1360                     dbus_message_iter_has_next(&iter))
1361                         return bus_send_error_reply(m, c, message, NULL, -EINVAL);
1362
1363                 for (p = properties; p->property; p++)
1364                         if (streq(p->interface, interface) && streq(p->property, property))
1365                                 break;
1366
1367                 if (p->set) {
1368                         DBusMessageIter sub;
1369                         char *sig;
1370
1371                         dbus_message_iter_recurse(&iter, &sub);
1372
1373                         if (!(sig = dbus_message_iter_get_signature(&sub)))
1374                                 goto oom;
1375
1376                         if (!streq(sig, p->signature)) {
1377                                 dbus_free(sig);
1378                                 return bus_send_error_reply(m, c, message, NULL, -EINVAL);
1379                         }
1380
1381                         dbus_free(sig);
1382
1383                         if ((r = p->set(m, &sub, property)) < 0) {
1384                                 if (r == -ENOMEM)
1385                                         goto oom;
1386                                 return bus_send_error_reply(m, c, message, NULL, r);
1387                         }
1388
1389                         if (!(reply = dbus_message_new_method_return(message)))
1390                                 goto oom;
1391                 } else {
1392                         if (p->property)
1393                                 dbus_set_error_const(&error, DBUS_ERROR_PROPERTY_READ_ONLY, "Property read-only");
1394                         else if (!nulstr_contains(interfaces, interface))
1395                                 dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface");
1396                         else
1397                                 dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_PROPERTY, "Unknown property");
1398
1399                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1400                 }
1401
1402         } else if (!nulstr_contains(interfaces, dbus_message_get_interface(message))) {
1403                 dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface");
1404                 return bus_send_error_reply(m, c, message, &error, -EINVAL);
1405         }
1406
1407         if (reply) {
1408                 if (!dbus_connection_send(c, reply, NULL))
1409                         goto oom;
1410
1411                 dbus_message_unref(reply);
1412                 return DBUS_HANDLER_RESULT_HANDLED;
1413         }
1414
1415         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1416
1417 oom:
1418         if (reply)
1419                 dbus_message_unref(reply);
1420
1421         dbus_error_free(&error);
1422
1423         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1424 }
1425
1426 static const char *error_to_dbus(int error) {
1427
1428         switch(error) {
1429
1430         case -EINVAL:
1431                 return DBUS_ERROR_INVALID_ARGS;
1432
1433         case -ENOMEM:
1434                 return DBUS_ERROR_NO_MEMORY;
1435
1436         case -EPERM:
1437         case -EACCES:
1438                 return DBUS_ERROR_ACCESS_DENIED;
1439
1440         case -ESRCH:
1441                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
1442
1443         case -ENOENT:
1444                 return DBUS_ERROR_FILE_NOT_FOUND;
1445
1446         case -EEXIST:
1447                 return DBUS_ERROR_FILE_EXISTS;
1448
1449         case -ETIMEDOUT:
1450         case -ETIME:
1451                 return DBUS_ERROR_TIMEOUT;
1452
1453         case -EIO:
1454                 return DBUS_ERROR_IO_ERROR;
1455
1456         case -ENETRESET:
1457         case -ECONNABORTED:
1458         case -ECONNRESET:
1459                 return DBUS_ERROR_DISCONNECTED;
1460         }
1461
1462         return DBUS_ERROR_FAILED;
1463 }
1464
1465 DBusHandlerResult bus_send_error_reply(Manager *m, DBusConnection *c, DBusMessage *message, DBusError *berror, int error) {
1466         DBusMessage *reply = NULL;
1467         const char *name, *text;
1468
1469         if (berror && dbus_error_is_set(berror)) {
1470                 name = berror->name;
1471                 text = berror->message;
1472         } else {
1473                 name = error_to_dbus(error);
1474                 text = strerror(-error);
1475         }
1476
1477         if (!(reply = dbus_message_new_error(message, name, text)))
1478                 goto oom;
1479
1480         if (!dbus_connection_send(c, reply, NULL))
1481                 goto oom;
1482
1483         dbus_message_unref(reply);
1484
1485         if (berror)
1486                 dbus_error_free(berror);
1487
1488         return DBUS_HANDLER_RESULT_HANDLED;
1489
1490 oom:
1491         if (reply)
1492                 dbus_message_unref(reply);
1493
1494         if (berror)
1495                 dbus_error_free(berror);
1496
1497         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1498 }
1499
1500 int bus_broadcast(Manager *m, DBusMessage *message) {
1501         bool oom = false;
1502         Iterator i;
1503         DBusConnection *c;
1504
1505         assert(m);
1506         assert(message);
1507
1508         SET_FOREACH(c, m->bus_connections_for_dispatch, i)
1509                 if (c != m->system_bus || m->running_as == MANAGER_SYSTEM)
1510                         oom = !dbus_connection_send(c, message, NULL);
1511
1512         SET_FOREACH(c, m->bus_connections, i)
1513                 if (c != m->system_bus || m->running_as == MANAGER_SYSTEM)
1514                         oom = !dbus_connection_send(c, message, NULL);
1515
1516         return oom ? -ENOMEM : 0;
1517 }
1518
1519 int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1520         const char *t = data;
1521
1522         assert(m);
1523         assert(i);
1524         assert(property);
1525
1526         if (!t)
1527                 t = "";
1528
1529         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
1530                 return -ENOMEM;
1531
1532         return 0;
1533 }
1534
1535 int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1536         DBusMessageIter sub;
1537         char **t = data;
1538
1539         assert(m);
1540         assert(i);
1541         assert(property);
1542
1543         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
1544                 return -ENOMEM;
1545
1546         STRV_FOREACH(t, t)
1547                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
1548                         return -ENOMEM;
1549
1550         if (!dbus_message_iter_close_container(i, &sub))
1551                 return -ENOMEM;
1552
1553         return 0;
1554 }
1555
1556 int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1557         bool *b = data;
1558         dbus_bool_t db;
1559
1560         assert(m);
1561         assert(i);
1562         assert(property);
1563         assert(b);
1564
1565         db = *b;
1566
1567         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
1568                 return -ENOMEM;
1569
1570         return 0;
1571 }
1572
1573 int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1574         assert(m);
1575         assert(i);
1576         assert(property);
1577         assert(data);
1578
1579         /* Let's ensure that pid_t is actually 64bit, and hence this
1580          * function can be used for usec_t */
1581         assert_cc(sizeof(uint64_t) == sizeof(usec_t));
1582
1583         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
1584                 return -ENOMEM;
1585
1586         return 0;
1587 }
1588
1589 int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1590         assert(m);
1591         assert(i);
1592         assert(property);
1593         assert(data);
1594
1595         /* Let's ensure that pid_t and mode_t is actually 32bit, and
1596          * hence this function can be used for pid_t/mode_t */
1597         assert_cc(sizeof(uint32_t) == sizeof(pid_t));
1598         assert_cc(sizeof(uint32_t) == sizeof(mode_t));
1599         assert_cc(sizeof(uint32_t) == sizeof(unsigned));
1600
1601         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
1602                 return -ENOMEM;
1603
1604         return 0;
1605 }
1606
1607 int bus_property_append_int32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1608         assert(m);
1609         assert(i);
1610         assert(property);
1611         assert(data);
1612
1613         assert_cc(sizeof(int32_t) == sizeof(int));
1614
1615         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data))
1616                 return -ENOMEM;
1617
1618         return 0;
1619 }
1620
1621 int bus_property_append_size(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1622         uint64_t u;
1623
1624         assert(m);
1625         assert(i);
1626         assert(property);
1627         assert(data);
1628
1629         u = (uint64_t) *(size_t*) data;
1630
1631         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
1632                 return -ENOMEM;
1633
1634         return 0;
1635 }
1636
1637 int bus_property_append_ul(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1638         uint64_t u;
1639
1640         assert(m);
1641         assert(i);
1642         assert(property);
1643         assert(data);
1644
1645         u = (uint64_t) *(unsigned long*) data;
1646
1647         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
1648                 return -ENOMEM;
1649
1650         return 0;
1651 }
1652
1653 int bus_parse_strv(DBusMessage *m, char ***_l) {
1654         DBusMessageIter iter, sub;
1655         unsigned n = 0, i = 0;
1656         char **l;
1657
1658         assert(m);
1659         assert(_l);
1660
1661         if (!dbus_message_iter_init(m, &iter) ||
1662             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
1663             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
1664             return -EINVAL;
1665
1666         dbus_message_iter_recurse(&iter, &sub);
1667
1668         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1669                 n++;
1670                 dbus_message_iter_next(&sub);
1671         }
1672
1673         if (!(l = new(char*, n+1)))
1674                 return -ENOMEM;
1675
1676         assert_se(dbus_message_iter_init(m, &iter));
1677         dbus_message_iter_recurse(&iter, &sub);
1678
1679         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1680                 const char *s;
1681
1682                 assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
1683                 dbus_message_iter_get_basic(&sub, &s);
1684
1685                 if (!(l[i++] = strdup(s))) {
1686                         strv_free(l);
1687                         return -ENOMEM;
1688                 }
1689
1690                 dbus_message_iter_next(&sub);
1691         }
1692
1693         assert(i == n);
1694         l[i] = NULL;
1695
1696         if (_l)
1697                 *_l = l;
1698
1699         return 0;
1700 }
1701
1702 bool bus_has_subscriber(Manager *m) {
1703         Iterator i;
1704         DBusConnection *c;
1705
1706         assert(m);
1707
1708         SET_FOREACH(c, m->bus_connections_for_dispatch, i)
1709                 if (bus_connection_has_subscriber(m, c))
1710                         return true;
1711
1712         SET_FOREACH(c, m->bus_connections, i)
1713                 if (bus_connection_has_subscriber(m, c))
1714                         return true;
1715
1716         return false;
1717 }
1718
1719 bool bus_connection_has_subscriber(Manager *m, DBusConnection *c) {
1720         assert(m);
1721         assert(c);
1722
1723         return !set_isempty(BUS_CONNECTION_SUBSCRIBED(m, c));
1724 }
1725
1726 DBusMessage* bus_properties_changed_new(const char *path, const char *interface, const char *properties) {
1727         DBusMessage *m;
1728         DBusMessageIter iter, sub;
1729         const char *i;
1730
1731         assert(interface);
1732         assert(properties);
1733
1734         if (!(m = dbus_message_new_signal(path, "org.freedesktop.DBus.Properties", "PropertiesChanged")))
1735                 goto oom;
1736
1737         dbus_message_iter_init_append(m, &iter);
1738
1739         /* We won't send any property values, since they might be
1740          * large and sometimes not cheap to generated */
1741
1742         if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &interface) ||
1743             !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub) ||
1744             !dbus_message_iter_close_container(&iter, &sub) ||
1745             !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub))
1746                 goto oom;
1747
1748         NULSTR_FOREACH(i, properties)
1749                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &i))
1750                         goto oom;
1751
1752         if (!dbus_message_iter_close_container(&iter, &sub))
1753                 goto oom;
1754
1755         return m;
1756
1757 oom:
1758         if (m)
1759                 dbus_message_unref(m);
1760
1761         return NULL;
1762 }