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(BUS_CONNECTION_SUBSCRIBED(m, connection), (char*) name))
 359                                 log_debug("Subscription client vanished: %s (left: %u)", name, set_size(BUS_CONNECTION_SUBSCRIBED(m, connection)));
 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         return 0;
 886
 887 fail:
 888         bus_done_api(m);
 889         dbus_error_free(&error);
 890
 891         return r;
 892 }
 893
 894 static int bus_init_private(Manager *m) {
 895         DBusError error;
 896         int r;
 897         const char *const external_only[] = {
 898                 "EXTERNAL",
 899                 NULL
 900         };
 901
 902         assert(m);
 903
 904         dbus_error_init(&error);
 905
 906         if (m->private_bus)
 907                 return 0;
 908
 909         /* We want the private bus only when running as init */
 910         if (m->running_as != MANAGER_SYSTEM)
 911                 return 0;
 912
 913         if (!(m->private_bus = dbus_server_listen("unix:abstract=/org/freedesktop/systemd1/private", &error))) {
 914                 log_error("Failed to create private D-Bus server: %s", error.message);
 915                 r = -EIO;
 916                 goto fail;
 917         }
 918
 919         if (!dbus_server_set_auth_mechanisms(m->private_bus, (const char**) external_only) ||
 920             !dbus_server_set_watch_functions(m->private_bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 921             !dbus_server_set_timeout_functions(m->private_bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL)) {
 922                 log_error("Not enough memory");
 923                 r = -ENOMEM;
 924                 goto fail;
 925         }
 926
 927         dbus_server_set_new_connection_function(m->private_bus, bus_new_connection, m, NULL);
 928
 929         log_debug("Successfully create private D-Bus server.");
 930
 931         return 0;
 932
 933 fail:
 934         bus_done_private(m);
 935         dbus_error_free(&error);
 936
 937         return r;
 938 }
 939
 940 int bus_init(Manager *m) {
 941         int r;
 942
 943         if (set_ensure_allocated(&m->bus_connections, trivial_hash_func, trivial_compare_func) < 0 ||
 944             set_ensure_allocated(&m->bus_connections_for_dispatch, trivial_hash_func, trivial_compare_func) < 0) {
 945                 log_error("Not enough memory");
 946                 return -ENOMEM;
 947         }
 948
 949         if (m->name_data_slot < 0)
 950                 if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot)) {
 951                         log_error("Not enough memory");
 952                         return -ENOMEM;
 953                 }
 954
 955         if (m->subscribed_data_slot < 0)
 956                 if (!dbus_pending_call_allocate_data_slot(&m->subscribed_data_slot)) {
 957                         log_error("Not enough memory");
 958                         return -ENOMEM;
 959                 }
 960
 961         if ((r = bus_init_system(m)) < 0 ||
 962             (r = bus_init_api(m)) < 0 ||
 963             (r = bus_init_private(m)) < 0)
 964                 return r;
 965
 966         return 0;
 967 }
 968
 969 static void shutdown_connection(Manager *m, DBusConnection *c) {
 970         Set *s;
 971         Job *j;
 972         Iterator i;
 973
 974         HASHMAP_FOREACH(j, m->jobs, i)
 975                 if (j->bus == c) {
 976                         free(j->bus_client);
 977                         j->bus_client = NULL;
 978
 979                         j->bus = NULL;
 980                 }
 981
 982         set_remove(m->bus_connections, c);
 983         set_remove(m->bus_connections_for_dispatch, c);
 984
 985         if ((s = BUS_CONNECTION_SUBSCRIBED(m, c))) {
 986                 char *t;
 987
 988                 while ((t = set_steal_first(s)))
 989                         free(t);
 990
 991                 set_free(s);
 992         }
 993
 994         dbus_connection_set_dispatch_status_function(c, NULL, NULL, NULL);
 995         dbus_connection_flush(c);
 996         dbus_connection_close(c);
 997         dbus_connection_unref(c);
 998 }
 999
1000 static void bus_done_api(Manager *m) {
1001         assert(m);
1002
1003         if (m->api_bus) {
1004                 if (m->system_bus == m->api_bus)
1005                         m->system_bus = NULL;
1006
1007                 shutdown_connection(m, m->api_bus);
1008                 m->api_bus = NULL;
1009         }
1010
1011
1012        if (m->queued_message) {
1013                dbus_message_unref(m->queued_message);
1014                m->queued_message = NULL;
1015        }
1016 }
1017
1018 static void bus_done_system(Manager *m) {
1019         assert(m);
1020
1021         if (m->system_bus == m->api_bus)
1022                 bus_done_api(m);
1023
1024         if (m->system_bus) {
1025                 shutdown_connection(m, m->system_bus);
1026                 m->system_bus = NULL;
1027         }
1028 }
1029
1030 static void bus_done_private(Manager *m) {
1031
1032         if (m->private_bus) {
1033                 dbus_server_disconnect(m->private_bus);
1034                 dbus_server_unref(m->private_bus);
1035                 m->private_bus = NULL;
1036         }
1037 }
1038
1039 void bus_done(Manager *m) {
1040         DBusConnection *c;
1041
1042         bus_done_api(m);
1043         bus_done_system(m);
1044         bus_done_private(m);
1045
1046         while ((c = set_steal_first(m->bus_connections)))
1047                 shutdown_connection(m, c);
1048
1049         while ((c = set_steal_first(m->bus_connections_for_dispatch)))
1050                 shutdown_connection(m, c);
1051
1052         set_free(m->bus_connections);
1053         set_free(m->bus_connections_for_dispatch);
1054
1055         if (m->name_data_slot >= 0)
1056                dbus_pending_call_free_data_slot(&m->name_data_slot);
1057
1058         if (m->subscribed_data_slot >= 0)
1059                 dbus_pending_call_free_data_slot(&m->subscribed_data_slot);
1060 }
1061
1062 static void query_pid_pending_cb(DBusPendingCall *pending, void *userdata) {
1063         Manager *m = userdata;
1064         DBusMessage *reply;
1065         DBusError error;
1066         const char *name;
1067
1068         dbus_error_init(&error);
1069
1070         assert_se(name = BUS_PENDING_CALL_NAME(m, pending));
1071         assert_se(reply = dbus_pending_call_steal_reply(pending));
1072
1073         switch (dbus_message_get_type(reply)) {
1074
1075         case DBUS_MESSAGE_TYPE_ERROR:
1076
1077                 assert_se(dbus_set_error_from_message(&error, reply));
1078                 log_warning("GetConnectionUnixProcessID() failed: %s", error.message);
1079                 break;
1080
1081         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
1082                 uint32_t r;
1083
1084                 if (!dbus_message_get_args(reply,
1085                                            &error,
1086                                            DBUS_TYPE_UINT32, &r,
1087                                            DBUS_TYPE_INVALID)) {
1088                         log_error("Failed to parse GetConnectionUnixProcessID() reply: %s", error.message);
1089                         break;
1090                 }
1091
1092                 manager_dispatch_bus_query_pid_done(m, name, (pid_t) r);
1093                 break;
1094         }
1095
1096         default:
1097                 assert_not_reached("Invalid reply message");
1098         }
1099
1100         dbus_message_unref(reply);
1101         dbus_error_free(&error);
1102 }
1103
1104 int bus_query_pid(Manager *m, const char *name) {
1105         DBusMessage *message = NULL;
1106         DBusPendingCall *pending = NULL;
1107         char *n = NULL;
1108
1109         assert(m);
1110         assert(name);
1111
1112         if (!(message = dbus_message_new_method_call(
1113                               DBUS_SERVICE_DBUS,
1114                               DBUS_PATH_DBUS,
1115                               DBUS_INTERFACE_DBUS,
1116                               "GetConnectionUnixProcessID")))
1117                 goto oom;
1118
1119         if (!(dbus_message_append_args(
1120                               message,
1121                               DBUS_TYPE_STRING, &name,
1122                               DBUS_TYPE_INVALID)))
1123                 goto oom;
1124
1125         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
1126                 goto oom;
1127
1128         if (!(n = strdup(name)))
1129                 goto oom;
1130
1131         if (!dbus_pending_call_set_data(pending, m->name_data_slot, n, free))
1132                 goto oom;
1133
1134         n = NULL;
1135
1136         if (!dbus_pending_call_set_notify(pending, query_pid_pending_cb, m, NULL))
1137                 goto oom;
1138
1139         dbus_message_unref(message);
1140         dbus_pending_call_unref(pending);
1141
1142         return 0;
1143
1144 oom:
1145         free(n);
1146
1147         if (pending) {
1148                 dbus_pending_call_cancel(pending);
1149                 dbus_pending_call_unref(pending);
1150         }
1151
1152         if (message)
1153                 dbus_message_unref(message);
1154
1155         return -ENOMEM;
1156 }
1157
1158 DBusHandlerResult bus_default_message_handler(Manager *m, DBusConnection *c, DBusMessage *message, const char*introspection, const BusProperty *properties) {
1159         DBusError error;
1160         DBusMessage *reply = NULL;
1161         int r;
1162
1163         assert(m);
1164         assert(message);
1165
1166         dbus_error_init(&error);
1167
1168         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
1169
1170                 if (!(reply = dbus_message_new_method_return(message)))
1171                         goto oom;
1172
1173                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
1174                         goto oom;
1175
1176         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
1177                 const char *interface, *property;
1178                 const BusProperty *p;
1179
1180                 if (!dbus_message_get_args(
1181                             message,
1182                             &error,
1183                             DBUS_TYPE_STRING, &interface,
1184                             DBUS_TYPE_STRING, &property,
1185                             DBUS_TYPE_INVALID))
1186                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1187
1188                 for (p = properties; p->property; p++)
1189                         if (streq(p->interface, interface) && streq(p->property, property))
1190                                 break;
1191
1192                 if (p->property) {
1193                         DBusMessageIter iter, sub;
1194
1195                         if (!(reply = dbus_message_new_method_return(message)))
1196                                 goto oom;
1197
1198                         dbus_message_iter_init_append(reply, &iter);
1199
1200                         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
1201                                 goto oom;
1202
1203                         if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) {
1204
1205                                 if (r == -ENOMEM)
1206                                         goto oom;
1207
1208                                 dbus_message_unref(reply);
1209                                 return bus_send_error_reply(m, c, message, NULL, r);
1210                         }
1211
1212                         if (!dbus_message_iter_close_container(&iter, &sub))
1213                                 goto oom;
1214                 }
1215         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
1216                 const char *interface;
1217                 const BusProperty *p;
1218                 DBusMessageIter iter, sub, sub2, sub3;
1219
1220                 if (!dbus_message_get_args(
1221                             message,
1222                             &error,
1223                             DBUS_TYPE_STRING, &interface,
1224                             DBUS_TYPE_INVALID))
1225                         return bus_send_error_reply(m, c, message, &error, -EINVAL);
1226
1227                 if (!(reply = dbus_message_new_method_return(message)))
1228                         goto oom;
1229
1230                 dbus_message_iter_init_append(reply, &iter);
1231
1232                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
1233                         goto oom;
1234
1235                 for (p = properties; p->property; p++) {
1236                         if (interface[0] && !streq(p->interface, interface))
1237                                 continue;
1238
1239                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
1240                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
1241                             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
1242                                 goto oom;
1243
1244                         if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) {
1245
1246                                 if (r == -ENOMEM)
1247                                         goto oom;
1248
1249                                 dbus_message_unref(reply);
1250                                 return bus_send_error_reply(m, c, message, NULL, r);
1251                         }
1252
1253                         if (!dbus_message_iter_close_container(&sub2, &sub3) ||
1254                             !dbus_message_iter_close_container(&sub, &sub2))
1255                                 goto oom;
1256                 }
1257
1258                 if (!dbus_message_iter_close_container(&iter, &sub))
1259                         goto oom;
1260         }
1261
1262         if (reply) {
1263                 if (!dbus_connection_send(c, reply, NULL))
1264                         goto oom;
1265
1266                 dbus_message_unref(reply);
1267                 return DBUS_HANDLER_RESULT_HANDLED;
1268         }
1269
1270         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1271
1272 oom:
1273         if (reply)
1274                 dbus_message_unref(reply);
1275
1276         dbus_error_free(&error);
1277
1278         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1279 }
1280
1281 static const char *error_to_dbus(int error) {
1282
1283         switch(error) {
1284
1285         case -EINVAL:
1286                 return DBUS_ERROR_INVALID_ARGS;
1287
1288         case -ENOMEM:
1289                 return DBUS_ERROR_NO_MEMORY;
1290
1291         case -EPERM:
1292         case -EACCES:
1293                 return DBUS_ERROR_ACCESS_DENIED;
1294
1295         case -ESRCH:
1296                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
1297
1298         case -ENOENT:
1299                 return DBUS_ERROR_FILE_NOT_FOUND;
1300
1301         case -EEXIST:
1302                 return DBUS_ERROR_FILE_EXISTS;
1303
1304         case -ETIMEDOUT:
1305                 return DBUS_ERROR_TIMEOUT;
1306
1307         case -EIO:
1308                 return DBUS_ERROR_IO_ERROR;
1309
1310         case -ENETRESET:
1311         case -ECONNABORTED:
1312         case -ECONNRESET:
1313                 return DBUS_ERROR_DISCONNECTED;
1314         }
1315
1316         return DBUS_ERROR_FAILED;
1317 }
1318
1319 DBusHandlerResult bus_send_error_reply(Manager *m, DBusConnection *c, DBusMessage *message, DBusError *bus_error, int error) {
1320         DBusMessage *reply = NULL;
1321         const char *name, *text;
1322
1323         if (bus_error && dbus_error_is_set(bus_error)) {
1324                 name = bus_error->name;
1325                 text = bus_error->message;
1326         } else {
1327                 name = error_to_dbus(error);
1328                 text = strerror(-error);
1329         }
1330
1331         if (!(reply = dbus_message_new_error(message, name, text)))
1332                 goto oom;
1333
1334         if (!dbus_connection_send(c, reply, NULL))
1335                 goto oom;
1336
1337         dbus_message_unref(reply);
1338
1339         if (bus_error)
1340                 dbus_error_free(bus_error);
1341
1342         return DBUS_HANDLER_RESULT_HANDLED;
1343
1344 oom:
1345         if (reply)
1346                 dbus_message_unref(reply);
1347
1348         if (bus_error)
1349                 dbus_error_free(bus_error);
1350
1351         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1352 }
1353
1354 int bus_broadcast(Manager *m, DBusMessage *message) {
1355         bool oom = false;
1356         Iterator i;
1357         DBusConnection *c;
1358
1359         assert(m);
1360         assert(message);
1361
1362         SET_FOREACH(c, m->bus_connections_for_dispatch, i)
1363                 if (c != m->system_bus || m->running_as == MANAGER_SYSTEM)
1364                         oom = !dbus_connection_send(c, message, NULL);
1365
1366         SET_FOREACH(c, m->bus_connections, i)
1367                 if (c != m->system_bus || m->running_as == MANAGER_SYSTEM)
1368                         oom = !dbus_connection_send(c, message, NULL);
1369
1370         return oom ? -ENOMEM : 0;
1371 }
1372
1373 int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1374         const char *t = data;
1375
1376         assert(m);
1377         assert(i);
1378         assert(property);
1379
1380         if (!t)
1381                 t = "";
1382
1383         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
1384                 return -ENOMEM;
1385
1386         return 0;
1387 }
1388
1389 int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1390         DBusMessageIter sub;
1391         char **t = data;
1392
1393         assert(m);
1394         assert(i);
1395         assert(property);
1396
1397         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
1398                 return -ENOMEM;
1399
1400         STRV_FOREACH(t, t)
1401                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
1402                         return -ENOMEM;
1403
1404         if (!dbus_message_iter_close_container(i, &sub))
1405                 return -ENOMEM;
1406
1407         return 0;
1408 }
1409
1410 int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1411         bool *b = data;
1412         dbus_bool_t db;
1413
1414         assert(m);
1415         assert(i);
1416         assert(property);
1417         assert(b);
1418
1419         db = *b;
1420
1421         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
1422                 return -ENOMEM;
1423
1424         return 0;
1425 }
1426
1427 int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1428         assert(m);
1429         assert(i);
1430         assert(property);
1431         assert(data);
1432
1433         /* Let's ensure that pid_t is actually 64bit, and hence this
1434          * function can be used for usec_t */
1435         assert_cc(sizeof(uint64_t) == sizeof(usec_t));
1436
1437         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
1438                 return -ENOMEM;
1439
1440         return 0;
1441 }
1442
1443 int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1444         assert(m);
1445         assert(i);
1446         assert(property);
1447         assert(data);
1448
1449         /* Let's ensure that pid_t and mode_t is actually 32bit, and
1450          * hence this function can be used for pid_t/mode_t */
1451         assert_cc(sizeof(uint32_t) == sizeof(pid_t));
1452         assert_cc(sizeof(uint32_t) == sizeof(mode_t));
1453         assert_cc(sizeof(uint32_t) == sizeof(unsigned));
1454
1455         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
1456                 return -ENOMEM;
1457
1458         return 0;
1459 }
1460
1461 int bus_property_append_int32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1462         assert(m);
1463         assert(i);
1464         assert(property);
1465         assert(data);
1466
1467         assert_cc(sizeof(int32_t) == sizeof(int));
1468
1469         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data))
1470                 return -ENOMEM;
1471
1472         return 0;
1473 }
1474
1475 int bus_property_append_size(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1476         uint64_t u;
1477
1478         assert(m);
1479         assert(i);
1480         assert(property);
1481         assert(data);
1482
1483         u = (uint64_t) *(size_t*) data;
1484
1485         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
1486                 return -ENOMEM;
1487
1488         return 0;
1489 }
1490
1491 int bus_property_append_ul(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1492         uint64_t u;
1493
1494         assert(m);
1495         assert(i);
1496         assert(property);
1497         assert(data);
1498
1499         u = (uint64_t) *(unsigned long*) data;
1500
1501         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
1502                 return -ENOMEM;
1503
1504         return 0;
1505 }
1506
1507 int bus_parse_strv(DBusMessage *m, char ***_l) {
1508         DBusMessageIter iter, sub;
1509         unsigned n = 0, i = 0;
1510         char **l;
1511
1512         assert(m);
1513         assert(_l);
1514
1515         if (!dbus_message_iter_init(m, &iter) ||
1516             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
1517             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
1518             return -EINVAL;
1519
1520         dbus_message_iter_recurse(&iter, &sub);
1521
1522         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1523                 n++;
1524                 dbus_message_iter_next(&sub);
1525         }
1526
1527         if (!(l = new(char*, n+1)))
1528                 return -ENOMEM;
1529
1530         assert_se(dbus_message_iter_init(m, &iter));
1531         dbus_message_iter_recurse(&iter, &sub);
1532
1533         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
1534                 const char *s;
1535
1536                 assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
1537                 dbus_message_iter_get_basic(&sub, &s);
1538
1539                 if (!(l[i++] = strdup(s))) {
1540                         strv_free(l);
1541                         return -ENOMEM;
1542                 }
1543
1544                 dbus_message_iter_next(&sub);
1545         }
1546
1547         assert(i == n);
1548         l[i] = NULL;
1549
1550         if (_l)
1551                 *_l = l;
1552
1553         return 0;
1554 }
1555
1556 bool bus_has_subscriber(Manager *m) {
1557         Iterator i;
1558         DBusConnection *c;
1559
1560         assert(m);
1561
1562         SET_FOREACH(c, m->bus_connections_for_dispatch, i)
1563                 if (bus_connection_has_subscriber(m, c))
1564                         return true;
1565
1566         SET_FOREACH(c, m->bus_connections, i)
1567                 if (bus_connection_has_subscriber(m, c))
1568                         return true;
1569
1570         return false;
1571 }
1572
1573 bool bus_connection_has_subscriber(Manager *m, DBusConnection *c) {
1574         assert(m);
1575         assert(c);
1576
1577         return !set_isempty(BUS_CONNECTION_SUBSCRIBED(m, c));
1578 }