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