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
 370                 return 1;
 371         }
 372
 373         if (m->request_system_bus_dispatch) {
 374                 if (dbus_connection_dispatch(m->system_bus) == DBUS_DISPATCH_COMPLETE)
 375                         m->request_system_bus_dispatch = false;
 376
 377                 return 1;
 378         }
 379
 380         return 0;
 381 }
 382
 383 static void pending_cb(DBusPendingCall *pending, void *userdata) {
 384         DBusMessage *reply;
 385         DBusError error;
 386
 387         dbus_error_init(&error);
 388
 389         assert_se(reply = dbus_pending_call_steal_reply(pending));
 390
 391         switch (dbus_message_get_type(reply)) {
 392
 393         case DBUS_MESSAGE_TYPE_ERROR:
 394
 395                 assert_se(dbus_set_error_from_message(&error, reply));
 396                 log_warning("RequestName() failed: %s", error.message);
 397                 break;
 398
 399         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 400                 uint32_t r;
 401
 402                 if (!dbus_message_get_args(reply,
 403                                            &error,
 404                                            DBUS_TYPE_UINT32, &r,
 405                                            DBUS_TYPE_INVALID)) {
 406                         log_error("Failed to parse RequestName() reply: %s", error.message);
 407                         break;
 408                 }
 409
 410                 if (r == 1)
 411                         log_debug("Successfully acquired name.");
 412                 else
 413                         log_error("Name already owned.");
 414
 415                 break;
 416         }
 417
 418         default:
 419                 assert_not_reached("Invalid reply message");
 420         }
 421
 422         dbus_message_unref(reply);
 423         dbus_error_free(&error);
 424 }
 425
 426 static int request_name(Manager *m) {
 427         DBusMessage *message;
 428         const char *name = "org.freedesktop.systemd1";
 429         uint32_t flags = 0;
 430         DBusPendingCall *pending;
 431
 432         if (!(message = dbus_message_new_method_call(
 433                               DBUS_SERVICE_DBUS,
 434                               DBUS_PATH_DBUS,
 435                               DBUS_INTERFACE_DBUS,
 436                               "RequestName")))
 437                 return -ENOMEM;
 438
 439         if (!dbus_message_append_args(
 440                             message,
 441                             DBUS_TYPE_STRING, &name,
 442                             DBUS_TYPE_UINT32, &flags,
 443                             DBUS_TYPE_INVALID)) {
 444                 dbus_message_unref(message);
 445                 return -ENOMEM;
 446         }
 447
 448         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1)) {
 449                 dbus_message_unref(message);
 450                 return -ENOMEM;
 451         }
 452
 453
 454         dbus_message_unref(message);
 455
 456         if (!dbus_pending_call_set_notify(pending, pending_cb, NULL, NULL)) {
 457                 dbus_pending_call_cancel(pending);
 458                 dbus_pending_call_unref(pending);
 459                 return -ENOMEM;
 460         }
 461
 462
 463         dbus_pending_call_unref(pending);
 464
 465         /* We simple ask for the name and don't wait for it. Sooner or
 466          * later we'll have it. */
 467
 468         return 0;
 469 }
 470
 471 static int bus_setup_loop(Manager *m, DBusConnection *bus) {
 472         assert(m);
 473         assert(bus);
 474
 475         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 476
 477         if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 478             !dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL))
 479                 return -ENOMEM;
 480
 481         return 0;
 482 }
 483
 484 int bus_init_system(Manager *m) {
 485         DBusError error;
 486         char *id;
 487         int r;
 488
 489         assert(m);
 490
 491         dbus_error_init(&error);
 492
 493         if (m->system_bus)
 494                 return 0;
 495
 496         if (m->running_as != MANAGER_SESSION && m->api_bus)
 497                 m->system_bus = m->api_bus;
 498         else {
 499                 if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
 500                         log_debug("Failed to get system D-Bus connection, retrying later: %s", error.message);
 501                         dbus_error_free(&error);
 502                         return 0;
 503                 }
 504
 505                 dbus_connection_set_dispatch_status_function(m->system_bus, system_bus_dispatch_status, m, NULL);
 506                 m->request_system_bus_dispatch = true;
 507
 508                 if ((r = bus_setup_loop(m, m->system_bus)) < 0) {
 509                         bus_done_system(m);
 510                         return r;
 511                 }
 512         }
 513
 514         if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) {
 515                 bus_done_system(m);
 516                 return -ENOMEM;
 517         }
 518
 519         dbus_bus_add_match(m->system_bus,
 520                            "type='signal',"
 521                            "interface='org.freedesktop.systemd1.Agent',"
 522                            "path='/org/freedesktop/systemd1/agent'",
 523                            &error);
 524
 525         if (dbus_error_is_set(&error)) {
 526                 log_error("Failed to register match: %s", error.message);
 527                 dbus_error_free(&error);
 528                 bus_done_system(m);
 529                 return -ENOMEM;
 530         }
 531
 532         log_debug("Successfully connected to system D-Bus bus %s as %s",
 533                   strnull((id = dbus_connection_get_server_id(m->system_bus))),
 534                   strnull(dbus_bus_get_unique_name(m->system_bus)));
 535         dbus_free(id);
 536
 537         return 0;
 538 }
 539
 540 int bus_init_api(Manager *m) {
 541         DBusError error;
 542         char *id;
 543         int r;
 544
 545         assert(m);
 546
 547         dbus_error_init(&error);
 548
 549         if (m->api_bus)
 550                 return 0;
 551
 552         if (m->running_as != MANAGER_SESSION && m->system_bus)
 553                 m->api_bus = m->system_bus;
 554         else {
 555                 if (!(m->api_bus = dbus_bus_get_private(m->running_as == MANAGER_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
 556                         log_debug("Failed to get API D-Bus connection, retrying later: %s", error.message);
 557                         dbus_error_free(&error);
 558                         return 0;
 559                 }
 560
 561                 dbus_connection_set_dispatch_status_function(m->api_bus, api_bus_dispatch_status, m, NULL);
 562                 m->request_api_bus_dispatch = true;
 563
 564                 if ((r = bus_setup_loop(m, m->api_bus)) < 0) {
 565                         bus_done_api(m);
 566                         return r;
 567                 }
 568         }
 569
 570         if (!dbus_connection_register_object_path(m->api_bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
 571             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
 572             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
 573             !dbus_connection_add_filter(m->api_bus, api_bus_message_filter, m, NULL)) {
 574                 bus_done_api(m);
 575                 return -ENOMEM;
 576         }
 577
 578         dbus_bus_add_match(m->api_bus,
 579                            "type='signal',"
 580                            "sender='"DBUS_SERVICE_DBUS"',"
 581                            "interface='"DBUS_INTERFACE_DBUS"',"
 582                            "path='"DBUS_PATH_DBUS"'",
 583                            &error);
 584
 585         if (dbus_error_is_set(&error)) {
 586                 log_error("Failed to register match: %s", error.message);
 587                 dbus_error_free(&error);
 588                 bus_done_api(m);
 589                 return -ENOMEM;
 590         }
 591
 592         if ((r = request_name(m)) < 0) {
 593                 bus_done_api(m);
 594                 return r;
 595         }
 596
 597         log_debug("Successfully connected to API D-Bus bus %s as %s",
 598                   strnull((id = dbus_connection_get_server_id(m->api_bus))),
 599                   strnull(dbus_bus_get_unique_name(m->api_bus)));
 600         dbus_free(id);
 601
 602         if (!m->subscribed)
 603                 if (!(m->subscribed = set_new(string_hash_func, string_compare_func)))
 604                         return -ENOMEM;
 605
 606         return 0;
 607 }
 608
 609 void bus_done_api(Manager *m) {
 610         assert(m);
 611
 612         if (m->api_bus) {
 613                 if (m->system_bus == m->api_bus)
 614                         m->system_bus = NULL;
 615
 616                 dbus_connection_close(m->api_bus);
 617                 dbus_connection_unref(m->api_bus);
 618                 m->api_bus = NULL;
 619
 620         }
 621
 622         if (m->subscribed) {
 623                 char *c;
 624
 625                 while ((c = set_steal_first(m->subscribed)))
 626                         free(c);
 627
 628                 set_free(m->subscribed);
 629                 m->subscribed = NULL;
 630         }
 631 }
 632
 633 void bus_done_system(Manager *m) {
 634         assert(m);
 635
 636         if (m->system_bus == m->api_bus)
 637                 bus_done_api(m);
 638
 639         if (m->system_bus) {
 640                 dbus_connection_close(m->system_bus);
 641                 dbus_connection_unref(m->system_bus);
 642                 m->system_bus = NULL;
 643         }
 644 }
 645
 646 DBusHandlerResult bus_default_message_handler(Manager *m, DBusMessage *message, const char*introspection, const BusProperty *properties) {
 647         DBusError error;
 648         DBusMessage *reply = NULL;
 649         int r;
 650
 651         assert(m);
 652         assert(message);
 653
 654         dbus_error_init(&error);
 655
 656         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
 657
 658                 if (!(reply = dbus_message_new_method_return(message)))
 659                         goto oom;
 660
 661                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
 662                         goto oom;
 663
 664         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
 665                 const char *interface, *property;
 666                 const BusProperty *p;
 667
 668                 if (!dbus_message_get_args(
 669                             message,
 670                             &error,
 671                             DBUS_TYPE_STRING, &interface,
 672                             DBUS_TYPE_STRING, &property,
 673                             DBUS_TYPE_INVALID))
 674                         return bus_send_error_reply(m, message, &error, -EINVAL);
 675
 676                 for (p = properties; p->property; p++)
 677                         if (streq(p->interface, interface) && streq(p->property, property))
 678                                 break;
 679
 680                 if (p->property) {
 681                         DBusMessageIter iter, sub;
 682
 683                         if (!(reply = dbus_message_new_method_return(message)))
 684                                 goto oom;
 685
 686                         dbus_message_iter_init_append(reply, &iter);
 687
 688                         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
 689                                 goto oom;
 690
 691                         if ((r = p->append(m, &sub, property, p->data)) < 0) {
 692
 693                                 if (r == -ENOMEM)
 694                                         goto oom;
 695
 696                                 dbus_message_unref(reply);
 697                                 return bus_send_error_reply(m, message, NULL, r);
 698                         }
 699
 700                         if (!dbus_message_iter_close_container(&iter, &sub))
 701                                 goto oom;
 702                 }
 703         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
 704                 const char *interface;
 705                 const BusProperty *p;
 706                 DBusMessageIter iter, sub, sub2, sub3;
 707                 bool any = false;
 708
 709                 if (!dbus_message_get_args(
 710                             message,
 711                             &error,
 712                             DBUS_TYPE_STRING, &interface,
 713                             DBUS_TYPE_INVALID))
 714                         return bus_send_error_reply(m, message, &error, -EINVAL);
 715
 716                 if (!(reply = dbus_message_new_method_return(message)))
 717                         goto oom;
 718
 719                 dbus_message_iter_init_append(reply, &iter);
 720
 721                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
 722                         goto oom;
 723
 724                 for (p = properties; p->property; p++) {
 725                         if (!streq(p->interface, interface))
 726                                 continue;
 727
 728                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
 729                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
 730                             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
 731                                 goto oom;
 732
 733                         if ((r = p->append(m, &sub3, p->property, p->data)) < 0) {
 734
 735                                 if (r == -ENOMEM)
 736                                         goto oom;
 737
 738                                 dbus_message_unref(reply);
 739                                 return bus_send_error_reply(m, message, NULL, r);
 740                         }
 741
 742                         if (!dbus_message_iter_close_container(&sub2, &sub3) ||
 743                             !dbus_message_iter_close_container(&sub, &sub2))
 744                                 goto oom;
 745
 746                         any = true;
 747                 }
 748
 749                 if (!dbus_message_iter_close_container(&iter, &sub))
 750                         goto oom;
 751         }
 752
 753         if (reply) {
 754                 if (!dbus_connection_send(m->api_bus, reply, NULL))
 755                         goto oom;
 756
 757                 dbus_message_unref(reply);
 758                 return DBUS_HANDLER_RESULT_HANDLED;
 759         }
 760
 761         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 762
 763 oom:
 764         if (reply)
 765                 dbus_message_unref(reply);
 766
 767         dbus_error_free(&error);
 768
 769         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 770 }
 771
 772 static const char *error_to_dbus(int error) {
 773
 774         switch(error) {
 775
 776         case -EINVAL:
 777                 return DBUS_ERROR_INVALID_ARGS;
 778
 779         case -ENOMEM:
 780                 return DBUS_ERROR_NO_MEMORY;
 781
 782         case -EPERM:
 783         case -EACCES:
 784                 return DBUS_ERROR_ACCESS_DENIED;
 785
 786         case -ESRCH:
 787                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
 788
 789         case -ENOENT:
 790                 return DBUS_ERROR_FILE_NOT_FOUND;
 791
 792         case -EEXIST:
 793                 return DBUS_ERROR_FILE_EXISTS;
 794
 795         case -ETIMEDOUT:
 796                 return DBUS_ERROR_TIMEOUT;
 797
 798         case -EIO:
 799                 return DBUS_ERROR_IO_ERROR;
 800
 801         case -ENETRESET:
 802         case -ECONNABORTED:
 803         case -ECONNRESET:
 804                 return DBUS_ERROR_DISCONNECTED;
 805         }
 806
 807         return DBUS_ERROR_FAILED;
 808 }
 809
 810 DBusHandlerResult bus_send_error_reply(Manager *m, DBusMessage *message, DBusError *bus_error, int error) {
 811         DBusMessage *reply = NULL;
 812         const char *name, *text;
 813
 814         if (bus_error && dbus_error_is_set(bus_error)) {
 815                 name = bus_error->name;
 816                 text = bus_error->message;
 817         } else {
 818                 name = error_to_dbus(error);
 819                 text = strerror(-error);
 820         }
 821
 822         if (!(reply = dbus_message_new_error(message, name, text)))
 823                 goto oom;
 824
 825         if (!dbus_connection_send(m->api_bus, reply, NULL))
 826                 goto oom;
 827
 828         dbus_message_unref(reply);
 829
 830         if (bus_error)
 831                 dbus_error_free(bus_error);
 832
 833         return DBUS_HANDLER_RESULT_HANDLED;
 834
 835 oom:
 836         if (reply)
 837                 dbus_message_unref(reply);
 838
 839         if (bus_error)
 840                 dbus_error_free(bus_error);
 841
 842         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 843 }
 844
 845 int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 846         const char *t = data;
 847
 848         assert(m);
 849         assert(i);
 850         assert(property);
 851
 852         if (!t)
 853                 t = "";
 854
 855         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
 856                 return -ENOMEM;
 857
 858         return 0;
 859 }
 860
 861 int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 862         DBusMessageIter sub;
 863         char **t = data;
 864
 865         assert(m);
 866         assert(i);
 867         assert(property);
 868
 869         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
 870                 return -ENOMEM;
 871
 872         STRV_FOREACH(t, t)
 873                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
 874                         return -ENOMEM;
 875
 876         if (!dbus_message_iter_close_container(i, &sub))
 877                 return -ENOMEM;
 878
 879         return 0;
 880 }
 881
 882 int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 883         bool *b = data;
 884         dbus_bool_t db;
 885
 886         assert(m);
 887         assert(i);
 888         assert(property);
 889         assert(b);
 890
 891         db = *b;
 892
 893         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
 894                 return -ENOMEM;
 895
 896         return 0;
 897 }
 898
 899 int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 900         assert(m);
 901         assert(i);
 902         assert(property);
 903         assert(data);
 904
 905         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
 906                 return -ENOMEM;
 907
 908         return 0;
 909 }
 910
 911 int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 912         assert(m);
 913         assert(i);
 914         assert(property);
 915         assert(data);
 916
 917         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
 918                 return -ENOMEM;
 919
 920         return 0;
 921 }