src/dbus.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/epoll.h>
  23 #include <sys/timerfd.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <dbus/dbus.h>
  27
  28 #include "dbus.h"
  29 #include "log.h"
  30 #include "strv.h"
  31 #include "cgroup.h"
  32 #include "dbus-unit.h"
  33 #include "dbus-job.h"
  34 #include "dbus-manager.h"
  35 #include "dbus-service.h"
  36 #include "dbus-socket.h"
  37 #include "dbus-target.h"
  38 #include "dbus-device.h"
  39 #include "dbus-mount.h"
  40 #include "dbus-automount.h"
  41 #include "dbus-snapshot.h"
  42 #include "dbus-swap.h"
  43 #include "dbus-timer.h"
  44 #include "dbus-path.h"
  45 #include "bus-errors.h"
  46
  47 #define CONNECTIONS_MAX 52
  48
  49 static const char bus_properties_interface[] = BUS_PROPERTIES_INTERFACE;
  50 static const char bus_introspectable_interface[] = BUS_INTROSPECTABLE_INTERFACE;
  51
  52 const char *const bus_interface_table[] = {
  53         "org.freedesktop.DBus.Properties",     bus_properties_interface,
  54         "org.freedesktop.DBus.Introspectable", bus_introspectable_interface,
  55         "org.freedesktop.systemd1.Manager",    bus_manager_interface,
  56         "org.freedesktop.systemd1.Job",        bus_job_interface,
  57         "org.freedesktop.systemd1.Unit",       bus_unit_interface,
  58         "org.freedesktop.systemd1.Service",    bus_service_interface,
  59         "org.freedesktop.systemd1.Socket",     bus_socket_interface,
  60         "org.freedesktop.systemd1.Target",     bus_target_interface,
  61         "org.freedesktop.systemd1.Device",     bus_device_interface,
  62         "org.freedesktop.systemd1.Mount",      bus_mount_interface,
  63         "org.freedesktop.systemd1.Automount",  bus_automount_interface,
  64         "org.freedesktop.systemd1.Snapshot",   bus_snapshot_interface,
  65         "org.freedesktop.systemd1.Swap",       bus_swap_interface,
  66         "org.freedesktop.systemd1.Timer",      bus_timer_interface,
  67         "org.freedesktop.systemd1.Path",       bus_path_interface,
  68         NULL
  69 };
  70
  71 static const char *error_to_dbus(int error);
  72 static void bus_done_api(Manager *m);
  73 static void bus_done_system(Manager *m);
  74 static void bus_done_private(Manager *m);
  75 static void shutdown_connection(Manager *m, DBusConnection *c);
  76
  77 static void bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
  78         Manager *m = data;
  79
  80         assert(bus);
  81         assert(m);
  82
  83         /* We maintain two sets, one for those connections where we
  84          * requested a dispatch, and another where we didn't. And then,
  85          * we move the connections between the two sets. */
  86
  87         if (status == DBUS_DISPATCH_COMPLETE)
  88                 set_move_one(m->bus_connections, m->bus_connections_for_dispatch, bus);
  89         else
  90                 set_move_one(m->bus_connections_for_dispatch, m->bus_connections, bus);
  91 }
  92
  93 static uint32_t bus_flags_to_events(DBusWatch *bus_watch) {
  94         unsigned flags;
  95         uint32_t events = 0;
  96
  97         assert(bus_watch);
  98
  99         /* no watch flags for disabled watches */
 100         if (!dbus_watch_get_enabled(bus_watch))
 101                 return 0;
 102
 103         flags = dbus_watch_get_flags(bus_watch);
 104
 105         if (flags & DBUS_WATCH_READABLE)
 106                 events |= EPOLLIN;
 107         if (flags & DBUS_WATCH_WRITABLE)
 108                 events |= EPOLLOUT;
 109
 110         return events | EPOLLHUP | EPOLLERR;
 111 }
 112
 113 static unsigned events_to_bus_flags(uint32_t events) {
 114         unsigned flags = 0;
 115
 116         if (events & EPOLLIN)
 117                 flags |= DBUS_WATCH_READABLE;
 118         if (events & EPOLLOUT)
 119                 flags |= DBUS_WATCH_WRITABLE;
 120         if (events & EPOLLHUP)
 121                 flags |= DBUS_WATCH_HANGUP;
 122         if (events & EPOLLERR)
 123                 flags |= DBUS_WATCH_ERROR;
 124
 125         return flags;
 126 }
 127
 128 void bus_watch_event(Manager *m, Watch *w, int events) {
 129         assert(m);
 130         assert(w);
 131
 132         /* This is called by the event loop whenever there is
 133          * something happening on D-Bus' file handles. */
 134
 135         if (!dbus_watch_get_enabled(w->data.bus_watch))
 136                 return;
 137
 138         dbus_watch_handle(w->data.bus_watch, events_to_bus_flags(events));
 139 }
 140
 141 static dbus_bool_t bus_add_watch(DBusWatch *bus_watch, void *data) {
 142         Manager *m = data;
 143         Watch *w;
 144         struct epoll_event ev;
 145
 146         assert(bus_watch);
 147         assert(m);
 148
 149         if (!(w = new0(Watch, 1)))
 150                 return FALSE;
 151
 152         w->fd = dbus_watch_get_unix_fd(bus_watch);
 153         w->type = WATCH_DBUS_WATCH;
 154         w->data.bus_watch = bus_watch;
 155
 156         zero(ev);
 157         ev.events = bus_flags_to_events(bus_watch);
 158         ev.data.ptr = w;
 159
 160         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
 161
 162                 if (errno != EEXIST) {
 163                         free(w);
 164                         return FALSE;
 165                 }
 166
 167                 /* Hmm, bloody D-Bus creates multiple watches on the
 168                  * same fd. epoll() does not like that. As a dirty
 169                  * hack we simply dup() the fd and hence get a second
 170                  * one we can safely add to the epoll(). */
 171
 172                 if ((w->fd = dup(w->fd)) < 0) {
 173                         free(w);
 174                         return FALSE;
 175                 }
 176
 177                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
 178                         free(w);
 179                         close_nointr_nofail(w->fd);
 180                         return FALSE;
 181                 }
 182
 183                 w->fd_is_dupped = true;
 184         }
 185
 186         dbus_watch_set_data(bus_watch, w, NULL);
 187
 188         return TRUE;
 189 }
 190
 191 static void bus_remove_watch(DBusWatch *bus_watch, void *data) {
 192         Manager *m = data;
 193         Watch *w;
 194
 195         assert(bus_watch);
 196         assert(m);
 197
 198         if (!(w = dbus_watch_get_data(bus_watch)))
 199                 return;
 200
 201         assert(w->type == WATCH_DBUS_WATCH);
 202         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 203
 204         if (w->fd_is_dupped)
 205                 close_nointr_nofail(w->fd);
 206
 207         free(w);
 208 }
 209
 210 static void bus_toggle_watch(DBusWatch *bus_watch, void *data) {
 211         Manager *m = data;
 212         Watch *w;
 213         struct epoll_event ev;
 214
 215         assert(bus_watch);
 216         assert(m);
 217
 218         assert_se(w = dbus_watch_get_data(bus_watch));
 219         assert(w->type == WATCH_DBUS_WATCH);
 220
 221         zero(ev);
 222         ev.events = bus_flags_to_events(bus_watch);
 223         ev.data.ptr = w;
 224
 225         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_MOD, w->fd, &ev) == 0);
 226 }
 227
 228 static int bus_timeout_arm(Manager *m, Watch *w) {
 229         struct itimerspec its;
 230
 231         assert(m);
 232         assert(w);
 233
 234         zero(its);
 235
 236         if (dbus_timeout_get_enabled(w->data.bus_timeout)) {
 237                 timespec_store(&its.it_value, dbus_timeout_get_interval(w->data.bus_timeout) * USEC_PER_MSEC);
 238                 its.it_interval = its.it_interval;
 239         }
 240
 241         if (timerfd_settime(w->fd, 0, &its, NULL) < 0)
 242                 return -errno;
 243
 244         return 0;
 245 }
 246
 247 void bus_timeout_event(Manager *m, Watch *w, int events) {
 248         assert(m);
 249         assert(w);
 250
 251         /* This is called by the event loop whenever there is
 252          * something happening on D-Bus' file handles. */
 253
 254         if (!(dbus_timeout_get_enabled(w->data.bus_timeout)))
 255                 return;
 256
 257         dbus_timeout_handle(w->data.bus_timeout);
 258 }
 259
 260 static dbus_bool_t bus_add_timeout(DBusTimeout *timeout, void *data) {
 261         Manager *m = data;
 262         Watch *w;
 263         struct epoll_event ev;
 264
 265         assert(timeout);
 266         assert(m);
 267
 268         if (!(w = new0(Watch, 1)))
 269                 return FALSE;
 270
 271         if (!(w->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
 272                 goto fail;
 273
 274         w->type = WATCH_DBUS_TIMEOUT;
 275         w->data.bus_timeout = timeout;
 276
 277         if (bus_timeout_arm(m, w) < 0)
 278                 goto fail;
 279
 280         zero(ev);
 281         ev.events = EPOLLIN;
 282         ev.data.ptr = w;
 283
 284         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0)
 285                 goto fail;
 286
 287         dbus_timeout_set_data(timeout, w, NULL);
 288
 289         return TRUE;
 290
 291 fail:
 292         if (w->fd >= 0)
 293                 close_nointr_nofail(w->fd);
 294
 295         free(w);
 296         return FALSE;
 297 }
 298
 299 static void bus_remove_timeout(DBusTimeout *timeout, void *data) {
 300         Manager *m = data;
 301         Watch *w;
 302
 303         assert(timeout);
 304         assert(m);
 305
 306         if (!(w = dbus_timeout_get_data(timeout)))
 307                 return;
 308
 309         assert(w->type == WATCH_DBUS_TIMEOUT);
 310         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 311         close_nointr_nofail(w->fd);
 312         free(w);
 313 }
 314
 315 static void bus_toggle_timeout(DBusTimeout *timeout, void *data) {
 316         Manager *m = data;
 317         Watch *w;
 318         int r;
 319
 320         assert(timeout);
 321         assert(m);
 322
 323         assert_se(w = dbus_timeout_get_data(timeout));
 324         assert(w->type == WATCH_DBUS_TIMEOUT);
 325
 326         if ((r = bus_timeout_arm(m, w)) < 0)
 327                 log_error("Failed to rearm timer: %s", strerror(-r));
 328 }
 329
 330 static DBusHandlerResult api_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) {
 331         Manager *m = data;
 332         DBusError error;
 333         DBusMessage *reply = NULL;
 334
 335         assert(connection);
 336         assert(message);
 337         assert(m);
 338
 339         dbus_error_init(&error);
 340
 341         if (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL ||
 342             dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_SIGNAL)
 343                 log_debug("Got D-Bus request: %s.%s() on %s",
 344                           dbus_message_get_interface(message),
 345                           dbus_message_get_member(message),
 346                           dbus_message_get_path(message));
 347
 348         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 349                 log_error("Warning! API D-Bus connection terminated.");
 350                 bus_done_api(m);
 351
 352         } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
 353                 const char *name, *old_owner, *new_owner;
 354
 355                 if (!dbus_message_get_args(message, &error,
 356                                            DBUS_TYPE_STRING, &name,
 357                                            DBUS_TYPE_STRING, &old_owner,
 358                                            DBUS_TYPE_STRING, &new_owner,
 359                                            DBUS_TYPE_INVALID))
 360                         log_error("Failed to parse NameOwnerChanged message: %s", error.message);
 361                 else  {
 362                         if (set_remove(BUS_CONNECTION_SUBSCRIBED(m, connection), (char*) name))
 363                                 log_debug("Subscription client vanished: %s (left: %u)", name, set_size(BUS_CONNECTION_SUBSCRIBED(m, connection)));
 364
 365                         if (old_owner[0] == 0)
 366                                 old_owner = NULL;
 367
 368                         if (new_owner[0] == 0)
 369                                 new_owner = NULL;
 370
 371                         manager_dispatch_bus_name_owner_changed(m, name, old_owner, new_owner);
 372                 }
 373         } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Activator", "ActivationRequest")) {
 374                 const char *name;
 375
 376                 if (!dbus_message_get_args(message, &error,
 377                                            DBUS_TYPE_STRING, &name,
 378                                            DBUS_TYPE_INVALID))
 379                         log_error("Failed to parse ActivationRequest message: %s", error.message);
 380                 else  {
 381                         int r;
 382                         Unit *u;
 383
 384                         log_debug("Got D-Bus activation request for %s", name);
 385
 386                         r = manager_load_unit(m, name, NULL, &error, &u);
 387
 388                         if (r >= 0 && u->meta.only_by_dependency)
 389                                 r = -EPERM;
 390
 391                         if (r >= 0)
 392                                 r = manager_add_job(m, JOB_START, u, JOB_REPLACE, true, &error, NULL);
 393
 394                         if (r < 0) {
 395                                 const char *id, *text;
 396
 397                                 log_warning("D-Bus activation failed for %s: %s", name, strerror(-r));
 398
 399                                 if (!(reply = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Activator", "ActivationFailure")))
 400                                         goto oom;
 401
 402                                 id = error.name ? error.name : error_to_dbus(r);
 403                                 text = bus_error(&error, r);
 404
 405                                 if (!dbus_message_set_destination(reply, DBUS_SERVICE_DBUS) ||
 406                                     !dbus_message_append_args(reply,
 407                                                               DBUS_TYPE_STRING, &name,
 408                                                               DBUS_TYPE_STRING, &id,
 409                                                               DBUS_TYPE_STRING, &text,
 410                                                               DBUS_TYPE_INVALID))
 411                                         goto oom;
 412                         }
 413
 414                         /* On success we don't do anything, the service will be spwaned now */
 415                 }
 416         }
 417
 418         dbus_error_free(&error);
 419
 420         if (reply) {
 421                 if (!dbus_connection_send(connection, reply, NULL))
 422                         goto oom;
 423
 424                 dbus_message_unref(reply);
 425         }
 426
 427         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 428
 429 oom:
 430         if (reply)
 431                 dbus_message_unref(reply);
 432
 433         dbus_error_free(&error);
 434
 435         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 436 }
 437
 438 static DBusHandlerResult system_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) {
 439         Manager *m = data;
 440         DBusError error;
 441
 442         assert(connection);
 443         assert(message);
 444         assert(m);
 445
 446         dbus_error_init(&error);
 447
 448         if (m->api_bus != m->system_bus &&
 449             (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL ||
 450              dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_SIGNAL))
 451                 log_debug("Got D-Bus request on system bus: %s.%s() on %s",
 452                           dbus_message_get_interface(message),
 453                           dbus_message_get_member(message),
 454                           dbus_message_get_path(message));
 455
 456         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 457                 log_error("Warning! System D-Bus connection terminated.");
 458                 bus_done_system(m);
 459
 460         } else if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
 461                 const char *cgroup;
 462
 463                 if (!dbus_message_get_args(message, &error,
 464                                            DBUS_TYPE_STRING, &cgroup,
 465                                            DBUS_TYPE_INVALID))
 466                         log_error("Failed to parse Released message: %s", error.message);
 467                 else
 468                         cgroup_notify_empty(m, cgroup);
 469         }
 470
 471         dbus_error_free(&error);
 472         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 473 }
 474
 475 static DBusHandlerResult private_bus_message_filter(DBusConnection *connection, DBusMessage *message, void *data) {
 476         Manager *m = data;
 477
 478         assert(connection);
 479         assert(message);
 480         assert(m);
 481
 482         if (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL ||
 483             dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_SIGNAL)
 484                 log_debug("Got D-Bus request: %s.%s() on %s",
 485                           dbus_message_get_interface(message),
 486                           dbus_message_get_member(message),
 487                           dbus_message_get_path(message));
 488
 489         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected"))
 490                 shutdown_connection(m, connection);
 491
 492         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 493 }
 494
 495 unsigned bus_dispatch(Manager *m) {
 496         DBusConnection *c;
 497
 498         assert(m);
 499
 500         if (m->queued_message) {
 501                 /* If we cannot get rid of this message we won't
 502                  * dispatch any D-Bus messages, so that we won't end
 503                  * up wanting to queue another message. */
 504
 505                 if (m->queued_message_connection)
 506                         if (!dbus_connection_send(m->queued_message_connection, m->queued_message, NULL))
 507                                 return 0;
 508
 509                 dbus_message_unref(m->queued_message);
 510                 m->queued_message = NULL;
 511                 m->queued_message_connection = NULL;
 512         }
 513
 514         if ((c = set_first(m->bus_connections_for_dispatch))) {
 515                 if (dbus_connection_dispatch(c) == DBUS_DISPATCH_COMPLETE)
 516                         set_move_one(m->bus_connections, m->bus_connections_for_dispatch, c);
 517
 518                 return 1;
 519         }
 520
 521         return 0;
 522 }
 523
 524 static void request_name_pending_cb(DBusPendingCall *pending, void *userdata) {
 525         DBusMessage *reply;
 526         DBusError error;
 527
 528         dbus_error_init(&error);
 529
 530         assert_se(reply = dbus_pending_call_steal_reply(pending));
 531
 532         switch (dbus_message_get_type(reply)) {
 533
 534         case DBUS_MESSAGE_TYPE_ERROR:
 535
 536                 assert_se(dbus_set_error_from_message(&error, reply));
 537                 log_warning("RequestName() failed: %s", error.message);
 538                 break;
 539
 540         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 541                 uint32_t r;
 542
 543                 if (!dbus_message_get_args(reply,
 544                                            &error,
 545                                            DBUS_TYPE_UINT32, &r,
 546                                            DBUS_TYPE_INVALID)) {
 547                         log_error("Failed to parse RequestName() reply: %s", error.message);
 548                         break;
 549                 }
 550
 551                 if (r == 1)
 552                         log_debug("Successfully acquired name.");
 553                 else
 554                         log_error("Name already owned.");
 555
 556                 break;
 557         }
 558
 559         default:
 560                 assert_not_reached("Invalid reply message");
 561         }
 562
 563         dbus_message_unref(reply);
 564         dbus_error_free(&error);
 565 }
 566
 567 static int request_name(Manager *m) {
 568         const char *name = "org.freedesktop.systemd1";
 569         uint32_t flags = 0;
 570         DBusMessage *message = NULL;
 571         DBusPendingCall *pending = NULL;
 572
 573         if (!(message = dbus_message_new_method_call(
 574                               DBUS_SERVICE_DBUS,
 575                               DBUS_PATH_DBUS,
 576                               DBUS_INTERFACE_DBUS,
 577                               "RequestName")))
 578                 goto oom;
 579
 580         if (!dbus_message_append_args(
 581                             message,
 582                             DBUS_TYPE_STRING, &name,
 583                             DBUS_TYPE_UINT32, &flags,
 584                             DBUS_TYPE_INVALID))
 585                 goto oom;
 586
 587         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
 588                 goto oom;
 589
 590         if (!dbus_pending_call_set_notify(pending, request_name_pending_cb, m, NULL))
 591                 goto oom;
 592
 593         dbus_message_unref(message);
 594         dbus_pending_call_unref(pending);
 595
 596         /* We simple ask for the name and don't wait for it. Sooner or
 597          * later we'll have it. */
 598
 599         return 0;
 600
 601 oom:
 602         if (pending) {
 603                 dbus_pending_call_cancel(pending);
 604                 dbus_pending_call_unref(pending);
 605         }
 606
 607         if (message)
 608                 dbus_message_unref(message);
 609
 610         return -ENOMEM;
 611 }
 612
 613 static void query_name_list_pending_cb(DBusPendingCall *pending, void *userdata) {
 614         DBusMessage *reply;
 615         DBusError error;
 616         Manager *m = userdata;
 617
 618         assert(m);
 619
 620         dbus_error_init(&error);
 621
 622         assert_se(reply = dbus_pending_call_steal_reply(pending));
 623
 624         switch (dbus_message_get_type(reply)) {
 625
 626         case DBUS_MESSAGE_TYPE_ERROR:
 627
 628                 assert_se(dbus_set_error_from_message(&error, reply));
 629                 log_warning("ListNames() failed: %s", error.message);
 630                 break;
 631
 632         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 633                 int r;
 634                 char **l;
 635
 636                 if ((r = bus_parse_strv(reply, &l)) < 0)
 637                         log_warning("Failed to parse ListNames() reply: %s", strerror(-r));
 638                 else {
 639                         char **t;
 640
 641                         STRV_FOREACH(t, l)
 642                                 /* This is a bit hacky, we say the
 643                                  * owner of the name is the name
 644                                  * itself, because we don't want the
 645                                  * extra traffic to figure out the
 646                                  * real owner. */
 647                                 manager_dispatch_bus_name_owner_changed(m, *t, NULL, *t);
 648
 649                         strv_free(l);
 650                 }
 651
 652                 break;
 653         }
 654
 655         default:
 656                 assert_not_reached("Invalid reply message");
 657         }
 658
 659         dbus_message_unref(reply);
 660         dbus_error_free(&error);
 661 }
 662
 663 static int query_name_list(Manager *m) {
 664         DBusMessage *message = NULL;
 665         DBusPendingCall *pending = NULL;
 666
 667         /* Asks for the currently installed bus names */
 668
 669         if (!(message = dbus_message_new_method_call(
 670                               DBUS_SERVICE_DBUS,
 671                               DBUS_PATH_DBUS,
 672                               DBUS_INTERFACE_DBUS,
 673                               "ListNames")))
 674                 goto oom;
 675
 676         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
 677                 goto oom;
 678
 679         if (!dbus_pending_call_set_notify(pending, query_name_list_pending_cb, m, NULL))
 680                 goto oom;
 681
 682         dbus_message_unref(message);
 683         dbus_pending_call_unref(pending);
 684
 685         /* We simple ask for the list and don't wait for it. Sooner or
 686          * later we'll get it. */
 687
 688         return 0;
 689
 690 oom:
 691         if (pending) {
 692                 dbus_pending_call_cancel(pending);
 693                 dbus_pending_call_unref(pending);
 694         }
 695
 696         if (message)
 697                 dbus_message_unref(message);
 698
 699         return -ENOMEM;
 700 }
 701
 702 static int bus_setup_loop(Manager *m, DBusConnection *bus) {
 703         assert(m);
 704         assert(bus);
 705
 706         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 707
 708         if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 709             !dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL)) {
 710                 log_error("Not enough memory");
 711                 return -ENOMEM;
 712         }
 713
 714         if (set_put(m->bus_connections_for_dispatch, bus) < 0) {
 715                 log_error("Not enough memory");
 716                 return -ENOMEM;
 717         }
 718
 719         dbus_connection_set_dispatch_status_function(bus, bus_dispatch_status, m, NULL);
 720         return 0;
 721 }
 722
 723 static dbus_bool_t allow_only_root(DBusConnection *connection, unsigned long uid, void *data) {
 724         return uid == 0;
 725 }
 726
 727 static void bus_new_connection(
 728                 DBusServer *server,
 729                 DBusConnection *new_connection,
 730                 void *data) {
 731
 732         Manager *m = data;
 733
 734         assert(m);
 735
 736         if (set_size(m->bus_connections) >= CONNECTIONS_MAX) {
 737                 log_error("Too many concurrent connections.");
 738                 return;
 739         }
 740
 741         dbus_connection_set_unix_user_function(new_connection, allow_only_root, NULL, NULL);
 742
 743         if (bus_setup_loop(m, new_connection) < 0)
 744                 return;
 745
 746         if (!dbus_connection_register_object_path(new_connection, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
 747             !dbus_connection_register_fallback(new_connection, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
 748             !dbus_connection_register_fallback(new_connection, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
 749             !dbus_connection_add_filter(new_connection, private_bus_message_filter, m, NULL)) {
 750                 log_error("Not enough memory.");
 751                 return;
 752         }
 753
 754         log_debug("Accepted connection on private bus.");
 755
 756         dbus_connection_ref(new_connection);
 757 }
 758
 759 static int bus_init_system(Manager *m) {
 760         DBusError error;
 761         char *id;
 762         int r;
 763
 764         assert(m);
 765
 766         dbus_error_init(&error);
 767
 768         if (m->system_bus)
 769                 return 0;
 770
 771         if (m->running_as == MANAGER_SYSTEM && m->api_bus)
 772                 m->system_bus = m->api_bus;
 773         else {
 774                 if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
 775                         log_debug("Failed to get system D-Bus connection, retrying later: %s", error.message);
 776                         r = 0;
 777                         goto fail;
 778                 }
 779
 780                 if ((r = bus_setup_loop(m, m->system_bus)) < 0)
 781                         goto fail;
 782         }
 783
 784         if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) {
 785                 log_error("Not enough memory");
 786                 r = -EIO;
 787                 goto fail;
 788         }
 789
 790         dbus_bus_add_match(m->system_bus,
 791                            "type='signal',"
 792                            "interface='org.freedesktop.systemd1.Agent',"
 793                            "member='Released',"
 794                            "path='/org/freedesktop/systemd1/agent'",
 795                            &error);
 796
 797         if (dbus_error_is_set(&error)) {
 798                 log_error("Failed to register match: %s", error.message);
 799                 r = -EIO;
 800                 goto fail;
 801         }
 802
 803         log_info("Successfully connected to system D-Bus bus %s as %s",
 804                  strnull((id = dbus_connection_get_server_id(m->system_bus))),
 805                  strnull(dbus_bus_get_unique_name(m->system_bus)));
 806         dbus_free(id);
 807
 808         return 0;
 809
 810 fail:
 811         bus_done_system(m);
 812         dbus_error_free(&error);
 813
 814         return r;
 815 }
 816
 817 static int bus_init_api(Manager *m) {
 818         DBusError error;
 819         char *id;
 820         int r;
 821
 822         assert(m);
 823
 824         dbus_error_init(&error);
 825
 826         if (m->api_bus)
 827                 return 0;
 828
 829         if (m->running_as == MANAGER_SYSTEM && m->system_bus)
 830                 m->api_bus = m->system_bus;
 831         else {
 832                 if (!(m->api_bus = dbus_bus_get_private(m->running_as == MANAGER_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
 833                         log_debug("Failed to get API D-Bus connection, retrying later: %s", error.message);
 834                         r = 0;
 835                         goto fail;
 836                 }
 837
 838                 if ((r = bus_setup_loop(m, m->api_bus)) < 0)
 839                         goto fail;
 840         }
 841
 842         if (!dbus_connection_register_object_path(m->api_bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
 843             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
 844             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
 845             !dbus_connection_add_filter(m->api_bus, api_bus_message_filter, m, NULL)) {
 846                 log_error("Not enough memory");
 847                 r = -ENOMEM;
 848                 goto fail;
 849         }
 850
 851         /* Get NameOwnerChange messages */
 852         dbus_bus_add_match(m->api_bus,
 853                            "type='signal',"
 854                            "sender='"DBUS_SERVICE_DBUS"',"
 855                            "interface='"DBUS_INTERFACE_DBUS"',"
 856                            "member='NameOwnerChanged',"
 857                            "path='"DBUS_PATH_DBUS"'",
 858                            &error);
 859
 860         if (dbus_error_is_set(&error)) {
 861                 log_error("Failed to register match: %s", error.message);
 862                 r = -EIO;
 863                 goto fail;
 864         }
 865
 866         /* Get activation requests */
 867         dbus_bus_add_match(m->api_bus,
 868                            "type='signal',"
 869                            "sender='"DBUS_SERVICE_DBUS"',"
 870                            "interface='org.freedesktop.systemd1.Activator',"
 871                            "member='ActivationRequest',"
 872                            "path='"DBUS_PATH_DBUS"'",
 873                            &error);
 874
 875         if (dbus_error_is_set(&error)) {
 876                 log_error("Failed to register match: %s", error.message);
 877                 r = -EIO;
 878                 goto fail;
 879         }
 880
 881         if ((r = request_name(m)) < 0)
 882                 goto fail;
 883
 884         if ((r = query_name_list(m)) < 0)
 885                 goto fail;
 886
 887         log_info("Successfully connected to API D-Bus bus %s as %s",
 888                  strnull((id = dbus_connection_get_server_id(m->api_bus))),
 889                  strnull(dbus_bus_get_unique_name(m->api_bus)));
 890         dbus_free(id);
 891
 892         return 0;
 893
 894 fail:
 895         bus_done_api(m);
 896         dbus_error_free(&error);
 897
 898         return r;
 899 }
 900
 901 static int bus_init_private(Manager *m) {
 902         DBusError error;
 903         int r;
 904         const char *const external_only[] = {
 905                 "EXTERNAL",
 906                 NULL
 907         };
 908
 909         assert(m);
 910
 911         dbus_error_init(&error);
 912
 913         if (m->private_bus)
 914                 return 0;
 915
 916         /* We want the private bus only when running as init */
 917         if (getpid() != 1)
 918                 return 0;
 919
 920         if (!(m->private_bus = dbus_server_listen("unix:abstract=/org/freedesktop/systemd1/private", &error))) {
 921                 log_error("Failed to create private D-Bus server: %s", error.message);
 922                 r = -EIO;
 923                 goto fail;
 924         }
 925
 926         if (!dbus_server_set_auth_mechanisms(m->private_bus, (const char**) external_only) ||
 927             !dbus_server_set_watch_functions(m->private_bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 928             !dbus_server_set_timeout_functions(m->private_bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL)) {
 929                 log_error("Not enough memory");
 930                 r = -ENOMEM;
 931                 goto fail;
 932         }
 933
 934         dbus_server_set_new_connection_function(m->private_bus, bus_new_connection, m, NULL);
 935
 936         log_debug("Successfully created private D-Bus server.");
 937
 938         return 0;
 939
 940 fail:
 941         bus_done_private(m);
 942         dbus_error_free(&error);
 943
 944         return r;
 945 }
 946
 947 int bus_init(Manager *m) {
 948         int r;
 949
 950         if (set_ensure_allocated(&m->bus_connections, trivial_hash_func, trivial_compare_func) < 0 ||
 951             set_ensure_allocated(&m->bus_connections_for_dispatch, trivial_hash_func, trivial_compare_func) < 0) {
 952                 log_error("Not enough memory");
 953                 return -ENOMEM;
 954         }
 955
 956         if (m->name_data_slot < 0)
 957                 if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot)) {
 958                         log_error("Not enough memory");
 959                         return -ENOMEM;
 960                 }
 961
 962         if (m->subscribed_data_slot < 0)
 963                 if (!dbus_pending_call_allocate_data_slot(&m->subscribed_data_slot)) {
 964                         log_error("Not enough memory");
 965                         return -ENOMEM;
 966                 }
 967
 968         if ((r = bus_init_system(m)) < 0 ||
 969             (r = bus_init_api(m)) < 0 ||
 970             (r = bus_init_private(m)) < 0)
 971                 return r;
 972
 973         return 0;
 974 }
 975
 976 static void shutdown_connection(Manager *m, DBusConnection *c) {
 977         Set *s;
 978         Job *j;
 979         Iterator i;
 980
 981         HASHMAP_FOREACH(j, m->jobs, i)
 982                 if (j->bus == c) {
 983                         free(j->bus_client);
 984                         j->bus_client = NULL;
 985
 986                         j->bus = NULL;
 987                 }
 988
 989         set_remove(m->bus_connections, c);
 990         set_remove(m->bus_connections_for_dispatch, c);
 991
 992         if ((s = BUS_CONNECTION_SUBSCRIBED(m, c))) {
 993                 char *t;
 994
 995                 while ((t = set_steal_first(s)))
 996                         free(t);
 997
 998                 set_free(s);
 999         }
1000
1001         if (m->queued_message_connection == c) {
1002                 m->queued_message_connection = NULL;
1003
1004                 if (m->queued_message) {
1005                         dbus_message_unref(m->queued_message);
1006                         m->queued_message = NULL;
1007                 }
1008         }
1009
1010         dbus_connection_set_dispatch_status_function(c, NULL, NULL, NULL);
1011         dbus_connection_flush(c);
1012         dbus_connection_close(c);
1013         dbus_connection_unref(c);
1014 }
1015
1016 static void bus_done_api(Manager *m) {
1017         assert(m);
1018
1019         if (m->api_bus) {
1020                 if (m->system_bus == m->api_bus)
1021                         m->system_bus = NULL;
1022
1023                 shutdown_connection(m, m->api_bus);
1024                 m->api_bus = NULL;
1025         }
1026
1027
1028        if (m->queued_message) {
1029                dbus_message_unref(m->queued_message);
1030                m->queued_message = NULL;
1031        }
1032 }
1033
1034 static void bus_done_system(Manager *m) {
1035         assert(m);
1036
1037         if (m->system_bus == m->api_bus)
1038                 bus_done_api(m);
1039
1040         if (m->system_bus) {
1041                 shutdown_connection(m, m->system_bus);
1042                 m->system_bus = NULL;
1043         }
1044 }
1045
1046 static void bus_done_private(Manager *m) {
1047
1048         if (m->private_bus) {
1049                 dbus_server_disconnect(m->private_bus);
1050                 dbus_server_unref(m->private_bus);
1051                 m->private_bus = NULL;
1052         }
1053 }
1054
1055 void bus_done(Manager *m) {
1056         DBusConnection *c;
1057
1058         bus_done_api(m);
1059         bus_done_system(m);
1060         bus_done_private(m);
1061
1062         while ((c = set_steal_first(m->bus_connections)))
1063                 shutdown_connection(m, c);
1064
1065         while ((c = set_steal_first(m->bus_connections_for_dispatch)))
1066                 shutdown_connection(m, c);
1067
1068         set_free(m->bus_connections);
1069         set_free(m->bus_connections_for_dispatch);
1070
1071         if (m->name_data_slot >= 0)
1072                dbus_pending_call_free_data_slot(&m->name_data_slot);
1073
1074         if (m->subscribed_data_slot >= 0)
1075                 dbus_pending_call_free_data_slot(&m->subscribed_data_slot);
1076 }
1077
1078 static void query_pid_pending_cb(DBusPendingCall *pending, void *userdata) {
1079         Manager *m = userdata;
1080         DBusMessage *reply;
1081         DBusError error;
1082         const char *name;
1083
1084         dbus_error_init(&error);
1085
1086         assert_se(name = BUS_PENDING_CALL_NAME(m, pending));
1087         assert_se(reply = dbus_pending_call_steal_reply(pending));
1088
1089         switch (dbus_message_get_type(reply)) {
1090
1091         case DBUS_MESSAGE_TYPE_ERROR:
1092
1093                 assert_se(dbus_set_error_from_message(&error, reply));
1094                 log_warning("GetConnectionUnixProcessID() failed: %s", error.message);
1095                 break;
1096
1097         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
1098                 uint32_t r;
1099
1100                 if (!dbus_message_get_args(reply,
1101                                            &error,
1102                                            DBUS_TYPE_UINT32, &r,
1103                                            DBUS_TYPE_INVALID)) {
1104                         log_error("Failed to parse GetConnectionUnixProcessID() reply: %s", error.message);
1105                         break;
1106                 }
1107
1108                 manager_dispatch_bus_query_pid_done(m, name, (pid_t) r);
1109                 break;
1110         }
1111
1112         default:
1113                 assert_not_reached("Invalid reply message");
1114         }
1115
1116         dbus_message_unref(reply);
1117         dbus_error_free(&error);
1118 }
1119
1120 int bus_query_pid(Manager *m, const char *name) {
1121         DBusMessage *message = NULL;
1122         DBusPendingCall *pending = NULL;
1123         char *n = NULL;
1124
1125         assert(m);
1126         assert(name);
1127
1128         if (!(message = dbus_message_new_method_call(
1129                               DBUS_SERVICE_DBUS,
1130                               DBUS_PATH_DBUS,
1131                               DBUS_INTERFACE_DBUS,
1132                               "GetConnectionUnixProcessID")))
1133                 goto oom;
1134
1135         if (!(dbus_message_append_args(
1136                               message,
1137                               DBUS_TYPE_STRING, &name,
1138                               DBUS_TYPE_INVALID)))
1139                 goto oom;
1140
1141         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
1142                 goto oom;
1143
1144         if (!(n = strdup(name)))
1145                 goto oom;
1146
1147         if (!dbus_pending_call_set_data(pending, m->name_data_slot, n, free))
1148                 goto oom;
1149
1150         n = NULL;
1151
1152         if (!dbus_pending_call_set_notify(pending, query_pid_pending_cb, m, NULL))
1153                 goto oom;
1154
1155         dbus_message_unref(message);
1156         dbus_pending_call_unref(pending);
1157
1158         return 0;
1159
1160 oom:
1161         free(n);
1162
1163         if (pending) {
1164                 dbus_pending_call_cancel(pending);
1165                 dbus_pending_call_unref(pending);
1166         }
1167
1168         if (message)
1169                 dbus_message_unref(message);
1170
1171         return -ENOMEM;
1172 }
1173
1174 DBusHandlerResult bus_default_message_handler(Manager *m, DBusConnection *c, DBusMessage *message, const char*introspection, const BusProperty *properties) {
1175         DBusError error;
1176         DBusMessage *reply = NULL;
1177         int r;
1178
1179         assert(m);
1180         assert(message);
1181
1182         dbus_error_init(&error);
1183
1184         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
1185
1186                 if (!(reply = dbus_message_new_method_return(message)))
1187                         goto oom;
1188
1189                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
1190                         goto oom;
1191
1192         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
1193                 const char *interface, *property;
1194                 const BusProperty *p;
1195
1196                 if (!dbus_message_get_args(
1197                             message,
1198                             &error,
1199                             DBUS_TYPE_STRING, &interface,
1200                             DBUS_TYPE_STRING, &property,
1201                             DBUS_TYPE_INVALID))
1202                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1203
1204                 for (p = properties; p->property; p++)
1205                         if (streq(p->interface, interface) && streq(p->property, property))
1206                                 break;
1207
1208                 if (p->property) {
1209                         DBusMessageIter iter, sub;
1210
1211                         if (!(reply = dbus_message_new_method_return(message)))
1212                                 goto oom;
1213
1214                         dbus_message_iter_init_append(reply, &iter);
1215
1216                         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
1217                                 goto oom;
1218
1219                         if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) {
1220
1221                                 if (r == -ENOMEM)
1222                                         goto oom;
1223
1224                                 dbus_message_unref(reply);
1225                                 return bus_send_error_reply(m, c, message, NULL, r);
1226                         }
1227
1228                         if (!dbus_message_iter_close_container(&iter, &sub))
1229                                 goto oom;
1230                 }
1231         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
1232                 const char *interface;
1233                 const BusProperty *p;
1234                 DBusMessageIter iter, sub, sub2, sub3;
1235
1236                 if (!dbus_message_get_args(
1237                             message,
1238                             &error,
1239                             DBUS_TYPE_STRING, &interface,
1240                             DBUS_TYPE_INVALID))
1241                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1242
1243                 if (!(reply = dbus_message_new_method_return(message)))
1244                         goto oom;
1245
1246                 dbus_message_iter_init_append(reply, &iter);
1247
1248                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
1249                         goto oom;
1250
1251                 for (p = properties; p->property; p++) {
1252                         if (interface[0] && !streq(p->interface, interface))
1253                                 continue;
1254
1255                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
1256                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
1257                             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
1258                                 goto oom;
1259
1260                         if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) {
1261
1262                                 if (r == -ENOMEM)
1263                                         goto oom;
1264
1265                                 dbus_message_unref(reply);
1266                                 return bus_send_error_reply(m, c, message, NULL, r);
1267                         }
1268
1269                         if (!dbus_message_iter_close_container(&sub2, &sub3) ||
1270                             !dbus_message_iter_close_container(&sub, &sub2))
1271                                 goto oom;
1272                 }
1273
1274                 if (!dbus_message_iter_close_container(&iter, &sub))
1275                         goto oom;
1276         }
1277
1278         if (reply) {
1279                 if (!dbus_connection_send(c, reply, NULL))
1280                         goto oom;
1281
1282                 dbus_message_unref(reply);
1283                 return DBUS_HANDLER_RESULT_HANDLED;
1284         }
1285
1286         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1287
1288 oom:
1289         if (reply)
1290                 dbus_message_unref(reply);
1291
1292         dbus_error_free(&error);
1293
1294         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1295 }
1296
1297 static const char *error_to_dbus(int error) {
1298
1299         switch(error) {
1300
1301         case -EINVAL:
1302                 return DBUS_ERROR_INVALID_ARGS;
1303
1304         case -ENOMEM:
1305                 return DBUS_ERROR_NO_MEMORY;
1306
1307         case -EPERM:
1308         case -EACCES:
1309                 return DBUS_ERROR_ACCESS_DENIED;
1310
1311         case -ESRCH:
1312                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
1313
1314         case -ENOENT:
1315                 return DBUS_ERROR_FILE_NOT_FOUND;
1316
1317         case -EEXIST:
1318                 return DBUS_ERROR_FILE_EXISTS;
1319
1320         case -ETIMEDOUT:
1321                 return DBUS_ERROR_TIMEOUT;
1322
1323         case -EIO:
1324                 return DBUS_ERROR_IO_ERROR;
1325
1326         case -ENETRESET:
1327         case -ECONNABORTED:
1328         case -ECONNRESET:
1329                 return DBUS_ERROR_DISCONNECTED;
1330         }
1331
1332         return DBUS_ERROR_FAILED;
1333 }
1334
1335 DBusHandlerResult bus_send_error_reply(Manager *m, DBusConnection *c, DBusMessage *message, DBusError *berror, int error) {
1336         DBusMessage *reply = NULL;
1337         const char *name, *text;
1338
1339         if (berror && dbus_error_is_set(berror)) {
1340                 name = berror->name;
1341                 text = berror->message;
1342         } else {
1343                 name = error_to_dbus(error);
1344                 text = strerror(-error);
1345         }
1346
1347         if (!(reply = dbus_message_new_error(message, name, text)))
1348                 goto oom;
1349
1350         if (!dbus_connection_send(c, reply, NULL))
1351                 goto oom;
1352
1353         dbus_message_unref(reply);
1354
1355         if (berror)
1356                 dbus_error_free(berror);
1357
1358         return DBUS_HANDLER_RESULT_HANDLED;
1359
1360 oom:
1361         if (reply)
1362                 dbus_message_unref(reply);
1363
1364         if (berror)
1365                 dbus_error_free(berror);
1366
1367         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1368 }
1369
1370 int bus_broadcast(Manager *m, DBusMessage *message) {
1371         bool oom = false;
1372         Iterator i;
1373         DBusConnection *c;
1374
1375         assert(m);
1376         assert(message);
1377
1378         SET_FOREACH(c, m->bus_connections_for_dispatch, i)
1379                 if (c != m->system_bus || m->running_as == MANAGER_SYSTEM)
1380                         oom = !dbus_connection_send(c, message, NULL);
1381
1382         SET_FOREACH(c, m->bus_connections, i)
1383                 if (c != m->system_bus || m->running_as == MANAGER_SYSTEM)
1384                         oom = !dbus_connection_send(c, message, NULL);
1385
1386         return oom ? -ENOMEM : 0;
1387 }
1388
1389 int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1390         const char *t = data;
1391
1392         assert(m);
1393         assert(i);
1394         assert(property);
1395
1396         if (!t)
1397                 t = "";
1398
1399         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
1400                 return -ENOMEM;
1401
1402         return 0;
1403 }
1404
1405 int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1406         DBusMessageIter sub;
1407         char **t = data;
1408
1409         assert(m);
1410         assert(i);
1411         assert(property);
1412
1413         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
1414                 return -ENOMEM;
1415
1416         STRV_FOREACH(t, t)
1417                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
1418                         return -ENOMEM;
1419
1420         if (!dbus_message_iter_close_container(i, &sub))
1421                 return -ENOMEM;
1422
1423         return 0;
1424 }
1425
1426 int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1427         bool *b = data;
1428         dbus_bool_t db;
1429
1430         assert(m);
1431         assert(i);
1432         assert(property);
1433         assert(b);
1434
1435         db = *b;
1436
1437         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
1438                 return -ENOMEM;
1439
1440         return 0;
1441 }
1442
1443 int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1444         assert(m);
1445         assert(i);
1446         assert(property);
1447         assert(data);
1448
1449         /* Let's ensure that pid_t is actually 64bit, and hence this
1450          * function can be used for usec_t */
1451         assert_cc(sizeof(uint64_t) == sizeof(usec_t));
1452
1453         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
1454                 return -ENOMEM;
1455
1456         return 0;
1457 }
1458
1459 int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1460         assert(m);
1461         assert(i);
1462         assert(property);
1463         assert(data);
1464
1465         /* Let's ensure that pid_t and mode_t is actually 32bit, and
1466          * hence this function can be used for pid_t/mode_t */
1467         assert_cc(sizeof(uint32_t) == sizeof(pid_t));
1468         assert_cc(sizeof(uint32_t) == sizeof(mode_t));
1469         assert_cc(sizeof(uint32_t) == sizeof(unsigned));
1470
1471         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
1472                 return -ENOMEM;
1473
1474         return 0;
1475 }
1476
1477 int bus_property_append_int32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1478         assert(m);
1479         assert(i);
1480         assert(property);
1481         assert(data);
1482
1483         assert_cc(sizeof(int32_t) == sizeof(int));
1484
1485         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data))
1486                 return -ENOMEM;
1487
1488         return 0;
1489 }
1490
1491 int bus_property_append_size(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1492         uint64_t u;
1493
1494         assert(m);
1495         assert(i);
1496         assert(property);
1497         assert(data);
1498
1499         u = (uint64_t) *(size_t*) data;
1500
1501         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
1502                 return -ENOMEM;
1503
1504         return 0;
1505 }
1506
1507 int bus_property_append_ul(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1508         uint64_t u;
1509
1510         assert(m);
1511         assert(i);
1512         assert(property);
1513         assert(data);
1514
1515         u = (uint64_t) *(unsigned long*) data;
1516
1517         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
1518                 return -ENOMEM;
1519
1520         return 0;
1521 }
1522
1523 int bus_parse_strv(DBusMessage *m, char ***_l) {
1524         DBusMessageIter iter, sub;
1525         unsigned n = 0, i = 0;
1526         char **l;
1527
1528         assert(m);
1529         assert(_l);
1530
1531         if (!dbus_message_iter_init(m, &iter) ||
1532             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
1533             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
1534             return -EINVAL;
1535
1536         dbus_message_iter_recurse(&iter, &sub);
1537
1538         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1539                 n++;
1540                 dbus_message_iter_next(&sub);
1541         }
1542
1543         if (!(l = new(char*, n+1)))
1544                 return -ENOMEM;
1545
1546         assert_se(dbus_message_iter_init(m, &iter));
1547         dbus_message_iter_recurse(&iter, &sub);
1548
1549         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1550                 const char *s;
1551
1552                 assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
1553                 dbus_message_iter_get_basic(&sub, &s);
1554
1555                 if (!(l[i++] = strdup(s))) {
1556                         strv_free(l);
1557                         return -ENOMEM;
1558                 }
1559
1560                 dbus_message_iter_next(&sub);
1561         }
1562
1563         assert(i == n);
1564         l[i] = NULL;
1565
1566         if (_l)
1567                 *_l = l;
1568
1569         return 0;
1570 }
1571
1572 bool bus_has_subscriber(Manager *m) {
1573         Iterator i;
1574         DBusConnection *c;
1575
1576         assert(m);
1577
1578         SET_FOREACH(c, m->bus_connections_for_dispatch, i)
1579                 if (bus_connection_has_subscriber(m, c))
1580                         return true;
1581
1582         SET_FOREACH(c, m->bus_connections, i)
1583                 if (bus_connection_has_subscriber(m, c))
1584                         return true;
1585
1586         return false;
1587 }
1588
1589 bool bus_connection_has_subscriber(Manager *m, DBusConnection *c) {
1590         assert(m);
1591         assert(c);
1592
1593         return !set_isempty(BUS_CONNECTION_SUBSCRIBED(m, c));
1594 }