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 <dbus/dbus.h>
  23
  24 #include <sys/epoll.h>
  25 #include <sys/timerfd.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28
  29 #include "dbus.h"
  30 #include "log.h"
  31 #include "strv.h"
  32 #include "cgroup.h"
  33
  34 static void api_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
  35         Manager *m = data;
  36
  37         assert(bus);
  38         assert(m);
  39
  40         if (!m->api_bus)
  41                 return;
  42
  43         assert(m->api_bus == bus);
  44
  45         m->request_api_bus_dispatch = status != DBUS_DISPATCH_COMPLETE;
  46 }
  47
  48 static void system_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
  49         Manager *m = data;
  50
  51         assert(bus);
  52         assert(m);
  53
  54         if (!m->system_bus)
  55                 return;
  56
  57         assert(m->system_bus == bus);
  58
  59         m->request_system_bus_dispatch = status != DBUS_DISPATCH_COMPLETE;
  60 }
  61
  62 static uint32_t bus_flags_to_events(DBusWatch *bus_watch) {
  63         unsigned flags;
  64         uint32_t events = 0;
  65
  66         assert(bus_watch);
  67
  68         /* no watch flags for disabled watches */
  69         if (!dbus_watch_get_enabled(bus_watch))
  70                 return 0;
  71
  72         flags = dbus_watch_get_flags(bus_watch);
  73
  74         if (flags & DBUS_WATCH_READABLE)
  75                 events |= EPOLLIN;
  76         if (flags & DBUS_WATCH_WRITABLE)
  77                 events |= EPOLLOUT;
  78
  79         return events | EPOLLHUP | EPOLLERR;
  80 }
  81
  82 static unsigned events_to_bus_flags(uint32_t events) {
  83         unsigned flags = 0;
  84
  85         if (events & EPOLLIN)
  86                 flags |= DBUS_WATCH_READABLE;
  87         if (events & EPOLLOUT)
  88                 flags |= DBUS_WATCH_WRITABLE;
  89         if (events & EPOLLHUP)
  90                 flags |= DBUS_WATCH_HANGUP;
  91         if (events & EPOLLERR)
  92                 flags |= DBUS_WATCH_ERROR;
  93
  94         return flags;
  95 }
  96
  97 void bus_watch_event(Manager *m, Watch *w, int events) {
  98         assert(m);
  99         assert(w);
 100
 101         /* This is called by the event loop whenever there is
 102          * something happening on D-Bus' file handles. */
 103
 104         if (!dbus_watch_get_enabled(w->data.bus_watch))
 105                 return;
 106
 107         dbus_watch_handle(w->data.bus_watch, events_to_bus_flags(events));
 108 }
 109
 110 static dbus_bool_t bus_add_watch(DBusWatch *bus_watch, void *data) {
 111         Manager *m = data;
 112         Watch *w;
 113         struct epoll_event ev;
 114
 115         assert(bus_watch);
 116         assert(m);
 117
 118         if (!(w = new0(Watch, 1)))
 119                 return FALSE;
 120
 121         w->fd = dbus_watch_get_unix_fd(bus_watch);
 122         w->type = WATCH_DBUS_WATCH;
 123         w->data.bus_watch = bus_watch;
 124
 125         zero(ev);
 126         ev.events = bus_flags_to_events(bus_watch);
 127         ev.data.ptr = w;
 128
 129         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
 130
 131                 if (errno != EEXIST) {
 132                         free(w);
 133                         return FALSE;
 134                 }
 135
 136                 /* Hmm, bloody D-Bus creates multiple watches on the
 137                  * same fd. epoll() does not like that. As a dirty
 138                  * hack we simply dup() the fd and hence get a second
 139                  * one we can safely add to the epoll(). */
 140
 141                 if ((w->fd = dup(w->fd)) < 0) {
 142                         free(w);
 143                         return FALSE;
 144                 }
 145
 146                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
 147                         free(w);
 148                         close_nointr_nofail(w->fd);
 149                         return FALSE;
 150                 }
 151
 152                 w->fd_is_dupped = true;
 153         }
 154
 155         dbus_watch_set_data(bus_watch, w, NULL);
 156
 157         return TRUE;
 158 }
 159
 160 static void bus_remove_watch(DBusWatch *bus_watch, void *data) {
 161         Manager *m = data;
 162         Watch *w;
 163
 164         assert(bus_watch);
 165         assert(m);
 166
 167         if (!(w = dbus_watch_get_data(bus_watch)))
 168                 return;
 169
 170         assert(w->type == WATCH_DBUS_WATCH);
 171         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 172
 173         if (w->fd_is_dupped)
 174                 close_nointr_nofail(w->fd);
 175
 176         free(w);
 177 }
 178
 179 static void bus_toggle_watch(DBusWatch *bus_watch, void *data) {
 180         Manager *m = data;
 181         Watch *w;
 182         struct epoll_event ev;
 183
 184         assert(bus_watch);
 185         assert(m);
 186
 187         assert_se(w = dbus_watch_get_data(bus_watch));
 188         assert(w->type == WATCH_DBUS_WATCH);
 189
 190         zero(ev);
 191         ev.events = bus_flags_to_events(bus_watch);
 192         ev.data.ptr = w;
 193
 194         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_MOD, w->fd, &ev) == 0);
 195 }
 196
 197 static int bus_timeout_arm(Manager *m, Watch *w) {
 198         struct itimerspec its;
 199
 200         assert(m);
 201         assert(w);
 202
 203         zero(its);
 204
 205         if (dbus_timeout_get_enabled(w->data.bus_timeout)) {
 206                 timespec_store(&its.it_value, dbus_timeout_get_interval(w->data.bus_timeout) * USEC_PER_MSEC);
 207                 its.it_interval = its.it_interval;
 208         }
 209
 210         if (timerfd_settime(w->fd, 0, &its, NULL) < 0)
 211                 return -errno;
 212
 213         return 0;
 214 }
 215
 216 void bus_timeout_event(Manager *m, Watch *w, int events) {
 217         assert(m);
 218         assert(w);
 219
 220         /* This is called by the event loop whenever there is
 221          * something happening on D-Bus' file handles. */
 222
 223         if (!(dbus_timeout_get_enabled(w->data.bus_timeout)))
 224                 return;
 225
 226         dbus_timeout_handle(w->data.bus_timeout);
 227 }
 228
 229 static dbus_bool_t bus_add_timeout(DBusTimeout *timeout, void *data) {
 230         Manager *m = data;
 231         Watch *w;
 232         struct epoll_event ev;
 233
 234         assert(timeout);
 235         assert(m);
 236
 237         if (!(w = new0(Watch, 1)))
 238                 return FALSE;
 239
 240         if (!(w->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
 241                 goto fail;
 242
 243         w->type = WATCH_DBUS_TIMEOUT;
 244         w->data.bus_timeout = timeout;
 245
 246         if (bus_timeout_arm(m, w) < 0)
 247                 goto fail;
 248
 249         zero(ev);
 250         ev.events = EPOLLIN;
 251         ev.data.ptr = w;
 252
 253         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0)
 254                 goto fail;
 255
 256         dbus_timeout_set_data(timeout, w, NULL);
 257
 258         return TRUE;
 259
 260 fail:
 261         if (w->fd >= 0)
 262                 close_nointr_nofail(w->fd);
 263
 264         free(w);
 265         return FALSE;
 266 }
 267
 268 static void bus_remove_timeout(DBusTimeout *timeout, void *data) {
 269         Manager *m = data;
 270         Watch *w;
 271
 272         assert(timeout);
 273         assert(m);
 274
 275         if (!(w = dbus_timeout_get_data(timeout)))
 276                 return;
 277
 278         assert(w->type == WATCH_DBUS_TIMEOUT);
 279         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 280         close_nointr_nofail(w->fd);
 281         free(w);
 282 }
 283
 284 static void bus_toggle_timeout(DBusTimeout *timeout, void *data) {
 285         Manager *m = data;
 286         Watch *w;
 287         int r;
 288
 289         assert(timeout);
 290         assert(m);
 291
 292         assert_se(w = dbus_timeout_get_data(timeout));
 293         assert(w->type == WATCH_DBUS_TIMEOUT);
 294
 295         if ((r = bus_timeout_arm(m, w)) < 0)
 296                 log_error("Failed to rearm timer: %s", strerror(-r));
 297 }
 298
 299 static DBusHandlerResult api_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
 300         Manager *m = data;
 301         DBusError error;
 302
 303         assert(connection);
 304         assert(message);
 305         assert(m);
 306
 307         dbus_error_init(&error);
 308
 309         /* log_debug("Got D-Bus request: %s.%s() on %s", */
 310         /*           dbus_message_get_interface(message), */
 311         /*           dbus_message_get_member(message), */
 312         /*           dbus_message_get_path(message)); */
 313
 314         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 315                 log_error("Warning! API D-Bus connection terminated.");
 316                 bus_done_api(m);
 317
 318         } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
 319                 const char *name, *old, *new;
 320
 321                 if (!dbus_message_get_args(message, &error,
 322                                            DBUS_TYPE_STRING, &name,
 323                                            DBUS_TYPE_STRING, &old,
 324                                            DBUS_TYPE_STRING, &new,
 325                                            DBUS_TYPE_INVALID))
 326                         log_error("Failed to parse NameOwnerChanged message: %s", error.message);
 327                 else  {
 328                         if (set_remove(m->subscribed, (char*) name))
 329                                 log_debug("Subscription client vanished: %s (left: %u)", name, set_size(m->subscribed));
 330                 }
 331         }
 332
 333         dbus_error_free(&error);
 334         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 335 }
 336
 337 static DBusHandlerResult system_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
 338         Manager *m = data;
 339         DBusError error;
 340
 341         assert(connection);
 342         assert(message);
 343         assert(m);
 344
 345         dbus_error_init(&error);
 346
 347         /* log_debug("Got D-Bus request: %s.%s() on %s", */
 348         /*           dbus_message_get_interface(message), */
 349         /*           dbus_message_get_member(message), */
 350         /*           dbus_message_get_path(message)); */
 351
 352         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 353                 log_error("Warning! System D-Bus connection terminated.");
 354                 bus_done_system(m);
 355
 356         } if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
 357                 const char *cgroup;
 358
 359                 if (!dbus_message_get_args(message, &error,
 360                                            DBUS_TYPE_STRING, &cgroup,
 361                                            DBUS_TYPE_INVALID))
 362                         log_error("Failed to parse Released message: %s", error.message);
 363                 else
 364                         cgroup_notify_empty(m, cgroup);
 365         }
 366
 367         dbus_error_free(&error);
 368         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 369 }
 370
 371 unsigned bus_dispatch(Manager *m) {
 372         assert(m);
 373
 374         if (m->request_api_bus_dispatch) {
 375                 if (dbus_connection_dispatch(m->api_bus) == DBUS_DISPATCH_COMPLETE)
 376                         m->request_api_bus_dispatch = false;
 377
 378                 return 1;
 379         }
 380
 381         if (m->request_system_bus_dispatch) {
 382                 if (dbus_connection_dispatch(m->system_bus) == DBUS_DISPATCH_COMPLETE)
 383                         m->request_system_bus_dispatch = false;
 384
 385                 return 1;
 386         }
 387
 388         return 0;
 389 }
 390
 391 static void pending_cb(DBusPendingCall *pending, void *userdata) {
 392         DBusMessage *reply;
 393         DBusError error;
 394
 395         dbus_error_init(&error);
 396
 397         assert_se(reply = dbus_pending_call_steal_reply(pending));
 398
 399         switch (dbus_message_get_type(reply)) {
 400
 401         case DBUS_MESSAGE_TYPE_ERROR:
 402
 403                 assert_se(dbus_set_error_from_message(&error, reply));
 404                 log_warning("RequestName() failed: %s", error.message);
 405                 break;
 406
 407         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 408                 uint32_t r;
 409
 410                 if (!dbus_message_get_args(reply,
 411                                            &error,
 412                                            DBUS_TYPE_UINT32, &r,
 413                                            DBUS_TYPE_INVALID)) {
 414                         log_error("Failed to parse RequestName() reply: %s", error.message);
 415                         break;
 416                 }
 417
 418                 if (r == 1)
 419                         log_debug("Successfully acquired name.");
 420                 else
 421                         log_error("Name already owned.");
 422
 423                 break;
 424         }
 425
 426         default:
 427                 assert_not_reached("Invalid reply message");
 428         }
 429
 430         dbus_message_unref(reply);
 431         dbus_error_free(&error);
 432 }
 433
 434 static int request_name(Manager *m) {
 435         DBusMessage *message;
 436         const char *name = "org.freedesktop.systemd1";
 437         uint32_t flags = 0;
 438         DBusPendingCall *pending;
 439
 440         if (!(message = dbus_message_new_method_call(
 441                               DBUS_SERVICE_DBUS,
 442                               DBUS_PATH_DBUS,
 443                               DBUS_INTERFACE_DBUS,
 444                               "RequestName")))
 445                 return -ENOMEM;
 446
 447         if (!dbus_message_append_args(
 448                             message,
 449                             DBUS_TYPE_STRING, &name,
 450                             DBUS_TYPE_UINT32, &flags,
 451                             DBUS_TYPE_INVALID)) {
 452                 dbus_message_unref(message);
 453                 return -ENOMEM;
 454         }
 455
 456         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1)) {
 457                 dbus_message_unref(message);
 458                 return -ENOMEM;
 459         }
 460
 461
 462         dbus_message_unref(message);
 463
 464         if (!dbus_pending_call_set_notify(pending, pending_cb, NULL, NULL)) {
 465                 dbus_pending_call_cancel(pending);
 466                 dbus_pending_call_unref(pending);
 467                 return -ENOMEM;
 468         }
 469
 470
 471         dbus_pending_call_unref(pending);
 472
 473         /* We simple ask for the name and don't wait for it. Sooner or
 474          * later we'll have it. */
 475
 476         return 0;
 477 }
 478
 479 static int bus_setup_loop(Manager *m, DBusConnection *bus) {
 480         assert(m);
 481         assert(bus);
 482
 483         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 484
 485         if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 486             !dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL))
 487                 return -ENOMEM;
 488
 489         return 0;
 490 }
 491
 492 int bus_init_system(Manager *m) {
 493         DBusError error;
 494         char *id;
 495         int r;
 496
 497         assert(m);
 498
 499         dbus_error_init(&error);
 500
 501         if (m->system_bus)
 502                 return 0;
 503
 504         if (m->running_as != MANAGER_SESSION && m->api_bus)
 505                 m->system_bus = m->api_bus;
 506         else {
 507                 if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
 508                         log_debug("Failed to get system D-Bus connection, retrying later: %s", error.message);
 509                         dbus_error_free(&error);
 510                         return 0;
 511                 }
 512
 513                 dbus_connection_set_dispatch_status_function(m->system_bus, system_bus_dispatch_status, m, NULL);
 514                 m->request_system_bus_dispatch = true;
 515
 516                 if ((r = bus_setup_loop(m, m->system_bus)) < 0) {
 517                         bus_done_system(m);
 518                         return r;
 519                 }
 520         }
 521
 522         if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) {
 523                 bus_done_system(m);
 524                 return -ENOMEM;
 525         }
 526
 527         dbus_bus_add_match(m->system_bus,
 528                            "type='signal',"
 529                            "interface='org.freedesktop.systemd1.Agent',"
 530                            "path='/org/freedesktop/systemd1/agent'",
 531                            &error);
 532
 533         if (dbus_error_is_set(&error)) {
 534                 log_error("Failed to register match: %s", error.message);
 535                 dbus_error_free(&error);
 536                 bus_done_system(m);
 537                 return -ENOMEM;
 538         }
 539
 540         log_debug("Successfully connected to system D-Bus bus %s as %s",
 541                   strnull((id = dbus_connection_get_server_id(m->system_bus))),
 542                   strnull(dbus_bus_get_unique_name(m->system_bus)));
 543         dbus_free(id);
 544
 545         return 0;
 546 }
 547
 548 int bus_init_api(Manager *m) {
 549         DBusError error;
 550         char *id;
 551         int r;
 552
 553         assert(m);
 554
 555         dbus_error_init(&error);
 556
 557         if (m->api_bus)
 558                 return 0;
 559
 560         if (m->running_as != MANAGER_SESSION && m->system_bus)
 561                 m->api_bus = m->system_bus;
 562         else {
 563                 if (!(m->api_bus = dbus_bus_get_private(m->running_as == MANAGER_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
 564                         log_debug("Failed to get API D-Bus connection, retrying later: %s", error.message);
 565                         dbus_error_free(&error);
 566                         return 0;
 567                 }
 568
 569                 dbus_connection_set_dispatch_status_function(m->api_bus, api_bus_dispatch_status, m, NULL);
 570                 m->request_api_bus_dispatch = true;
 571
 572                 if ((r = bus_setup_loop(m, m->api_bus)) < 0) {
 573                         bus_done_api(m);
 574                         return r;
 575                 }
 576         }
 577
 578         if (!dbus_connection_register_object_path(m->api_bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
 579             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
 580             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
 581             !dbus_connection_add_filter(m->api_bus, api_bus_message_filter, m, NULL)) {
 582                 bus_done_api(m);
 583                 return -ENOMEM;
 584         }
 585
 586         dbus_bus_add_match(m->api_bus,
 587                            "type='signal',"
 588                            "sender='"DBUS_SERVICE_DBUS"',"
 589                            "interface='"DBUS_INTERFACE_DBUS"',"
 590                            "path='"DBUS_PATH_DBUS"'",
 591                            &error);
 592
 593         if (dbus_error_is_set(&error)) {
 594                 log_error("Failed to register match: %s", error.message);
 595                 dbus_error_free(&error);
 596                 bus_done_api(m);
 597                 return -ENOMEM;
 598         }
 599
 600         if ((r = request_name(m)) < 0) {
 601                 bus_done_api(m);
 602                 return r;
 603         }
 604
 605         log_debug("Successfully connected to API D-Bus bus %s as %s",
 606                   strnull((id = dbus_connection_get_server_id(m->api_bus))),
 607                   strnull(dbus_bus_get_unique_name(m->api_bus)));
 608         dbus_free(id);
 609
 610         if (!m->subscribed)
 611                 if (!(m->subscribed = set_new(string_hash_func, string_compare_func)))
 612                         return -ENOMEM;
 613
 614         return 0;
 615 }
 616
 617 void bus_done_api(Manager *m) {
 618         assert(m);
 619
 620         if (m->api_bus) {
 621                 if (m->system_bus == m->api_bus)
 622                         m->system_bus = NULL;
 623
 624                 dbus_connection_set_dispatch_status_function(m->api_bus, NULL, NULL, NULL);
 625                 dbus_connection_close(m->api_bus);
 626                 dbus_connection_unref(m->api_bus);
 627                 m->api_bus = NULL;
 628         }
 629
 630         if (m->subscribed) {
 631                 char *c;
 632
 633                 while ((c = set_steal_first(m->subscribed)))
 634                         free(c);
 635
 636                 set_free(m->subscribed);
 637                 m->subscribed = NULL;
 638         }
 639 }
 640
 641 void bus_done_system(Manager *m) {
 642         assert(m);
 643
 644         if (m->system_bus == m->api_bus)
 645                 bus_done_api(m);
 646
 647         if (m->system_bus) {
 648                 dbus_connection_set_dispatch_status_function(m->system_bus, NULL, NULL, NULL);
 649                 dbus_connection_close(m->system_bus);
 650                 dbus_connection_unref(m->system_bus);
 651                 m->system_bus = NULL;
 652         }
 653 }
 654
 655 DBusHandlerResult bus_default_message_handler(Manager *m, DBusMessage *message, const char*introspection, const BusProperty *properties) {
 656         DBusError error;
 657         DBusMessage *reply = NULL;
 658         int r;
 659
 660         assert(m);
 661         assert(message);
 662
 663         dbus_error_init(&error);
 664
 665         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
 666
 667                 if (!(reply = dbus_message_new_method_return(message)))
 668                         goto oom;
 669
 670                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
 671                         goto oom;
 672
 673         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
 674                 const char *interface, *property;
 675                 const BusProperty *p;
 676
 677                 if (!dbus_message_get_args(
 678                             message,
 679                             &error,
 680                             DBUS_TYPE_STRING, &interface,
 681                             DBUS_TYPE_STRING, &property,
 682                             DBUS_TYPE_INVALID))
 683                         return bus_send_error_reply(m, message, &error, -EINVAL);
 684
 685                 for (p = properties; p->property; p++)
 686                         if (streq(p->interface, interface) && streq(p->property, property))
 687                                 break;
 688
 689                 if (p->property) {
 690                         DBusMessageIter iter, sub;
 691
 692                         if (!(reply = dbus_message_new_method_return(message)))
 693                                 goto oom;
 694
 695                         dbus_message_iter_init_append(reply, &iter);
 696
 697                         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
 698                                 goto oom;
 699
 700                         if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) {
 701
 702                                 if (r == -ENOMEM)
 703                                         goto oom;
 704
 705                                 dbus_message_unref(reply);
 706                                 return bus_send_error_reply(m, message, NULL, r);
 707                         }
 708
 709                         if (!dbus_message_iter_close_container(&iter, &sub))
 710                                 goto oom;
 711                 }
 712         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
 713                 const char *interface;
 714                 const BusProperty *p;
 715                 DBusMessageIter iter, sub, sub2, sub3;
 716                 bool any = false;
 717
 718                 if (!dbus_message_get_args(
 719                             message,
 720                             &error,
 721                             DBUS_TYPE_STRING, &interface,
 722                             DBUS_TYPE_INVALID))
 723                         return bus_send_error_reply(m, message, &error, -EINVAL);
 724
 725                 if (!(reply = dbus_message_new_method_return(message)))
 726                         goto oom;
 727
 728                 dbus_message_iter_init_append(reply, &iter);
 729
 730                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
 731                         goto oom;
 732
 733                 for (p = properties; p->property; p++) {
 734                         if (!streq(p->interface, interface))
 735                                 continue;
 736
 737                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
 738                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
 739                             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
 740                                 goto oom;
 741
 742                         if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) {
 743
 744                                 if (r == -ENOMEM)
 745                                         goto oom;
 746
 747                                 dbus_message_unref(reply);
 748                                 return bus_send_error_reply(m, message, NULL, r);
 749                         }
 750
 751                         if (!dbus_message_iter_close_container(&sub2, &sub3) ||
 752                             !dbus_message_iter_close_container(&sub, &sub2))
 753                                 goto oom;
 754
 755                         any = true;
 756                 }
 757
 758                 if (!dbus_message_iter_close_container(&iter, &sub))
 759                         goto oom;
 760         }
 761
 762         if (reply) {
 763                 if (!dbus_connection_send(m->api_bus, reply, NULL))
 764                         goto oom;
 765
 766                 dbus_message_unref(reply);
 767                 return DBUS_HANDLER_RESULT_HANDLED;
 768         }
 769
 770         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 771
 772 oom:
 773         if (reply)
 774                 dbus_message_unref(reply);
 775
 776         dbus_error_free(&error);
 777
 778         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 779 }
 780
 781 static const char *error_to_dbus(int error) {
 782
 783         switch(error) {
 784
 785         case -EINVAL:
 786                 return DBUS_ERROR_INVALID_ARGS;
 787
 788         case -ENOMEM:
 789                 return DBUS_ERROR_NO_MEMORY;
 790
 791         case -EPERM:
 792         case -EACCES:
 793                 return DBUS_ERROR_ACCESS_DENIED;
 794
 795         case -ESRCH:
 796                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
 797
 798         case -ENOENT:
 799                 return DBUS_ERROR_FILE_NOT_FOUND;
 800
 801         case -EEXIST:
 802                 return DBUS_ERROR_FILE_EXISTS;
 803
 804         case -ETIMEDOUT:
 805                 return DBUS_ERROR_TIMEOUT;
 806
 807         case -EIO:
 808                 return DBUS_ERROR_IO_ERROR;
 809
 810         case -ENETRESET:
 811         case -ECONNABORTED:
 812         case -ECONNRESET:
 813                 return DBUS_ERROR_DISCONNECTED;
 814         }
 815
 816         return DBUS_ERROR_FAILED;
 817 }
 818
 819 DBusHandlerResult bus_send_error_reply(Manager *m, DBusMessage *message, DBusError *bus_error, int error) {
 820         DBusMessage *reply = NULL;
 821         const char *name, *text;
 822
 823         if (bus_error && dbus_error_is_set(bus_error)) {
 824                 name = bus_error->name;
 825                 text = bus_error->message;
 826         } else {
 827                 name = error_to_dbus(error);
 828                 text = strerror(-error);
 829         }
 830
 831         if (!(reply = dbus_message_new_error(message, name, text)))
 832                 goto oom;
 833
 834         if (!dbus_connection_send(m->api_bus, reply, NULL))
 835                 goto oom;
 836
 837         dbus_message_unref(reply);
 838
 839         if (bus_error)
 840                 dbus_error_free(bus_error);
 841
 842         return DBUS_HANDLER_RESULT_HANDLED;
 843
 844 oom:
 845         if (reply)
 846                 dbus_message_unref(reply);
 847
 848         if (bus_error)
 849                 dbus_error_free(bus_error);
 850
 851         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 852 }
 853
 854 int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 855         const char *t = data;
 856
 857         assert(m);
 858         assert(i);
 859         assert(property);
 860
 861         if (!t)
 862                 t = "";
 863
 864         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
 865                 return -ENOMEM;
 866
 867         return 0;
 868 }
 869
 870 int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 871         DBusMessageIter sub;
 872         char **t = data;
 873
 874         assert(m);
 875         assert(i);
 876         assert(property);
 877
 878         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
 879                 return -ENOMEM;
 880
 881         STRV_FOREACH(t, t)
 882                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
 883                         return -ENOMEM;
 884
 885         if (!dbus_message_iter_close_container(i, &sub))
 886                 return -ENOMEM;
 887
 888         return 0;
 889 }
 890
 891 int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 892         bool *b = data;
 893         dbus_bool_t db;
 894
 895         assert(m);
 896         assert(i);
 897         assert(property);
 898         assert(b);
 899
 900         db = *b;
 901
 902         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
 903                 return -ENOMEM;
 904
 905         return 0;
 906 }
 907
 908 int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 909         assert(m);
 910         assert(i);
 911         assert(property);
 912         assert(data);
 913
 914         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
 915                 return -ENOMEM;
 916
 917         return 0;
 918 }
 919
 920 int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 921         assert(m);
 922         assert(i);
 923         assert(property);
 924         assert(data);
 925
 926         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
 927                 return -ENOMEM;
 928
 929         return 0;
 930 }