src/dbus.c

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