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