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 bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
  35         Manager *m = data;
  36
  37         assert(bus);
  38         assert(m);
  39         assert(m->bus == bus);
  40
  41         m->request_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 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
 309                 /* FIXME: we probably should restart D-Bus here */
 310
 311         } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
 312                 const char *name, *old, *new;
 313
 314                 if (!dbus_message_get_args(message, &error,
 315                                            DBUS_TYPE_STRING, &name,
 316                                            DBUS_TYPE_STRING, &old,
 317                                            DBUS_TYPE_STRING, &new,
 318                                            DBUS_TYPE_INVALID))
 319                         log_error("Failed to parse NameOwnerChanged message: %s", error.message);
 320                 else  {
 321                         if (set_remove(m->subscribed, (char*) name))
 322                                 log_debug("Subscription client vanished: %s (left: %u)", name, set_size(m->subscribed));
 323                 }
 324         }
 325
 326         dbus_error_free(&error);
 327         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 328 }
 329
 330 static DBusHandlerResult system_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
 331         Manager *m = data;
 332         DBusError error;
 333
 334         assert(connection);
 335         assert(message);
 336         assert(m);
 337
 338         dbus_error_init(&error);
 339
 340         /* log_debug("Got D-Bus request: %s.%s() on %s", */
 341         /*           dbus_message_get_interface(message), */
 342         /*           dbus_message_get_member(message), */
 343         /*           dbus_message_get_path(message)); */
 344
 345         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 346                 log_error("Warning! D-Bus connection terminated.");
 347
 348                 /* FIXME: we probably should restart D-Bus here */
 349
 350         } if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
 351                 const char *cgroup;
 352
 353                 if (!dbus_message_get_args(message, &error,
 354                                            DBUS_TYPE_STRING, &cgroup,
 355                                            DBUS_TYPE_INVALID))
 356                         log_error("Failed to parse Released message: %s", error.message);
 357                 else
 358                         cgroup_notify_empty(m, cgroup);
 359         }
 360
 361         dbus_error_free(&error);
 362         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 363 }
 364
 365 unsigned bus_dispatch(Manager *m) {
 366         assert(m);
 367
 368         if (m->request_bus_dispatch)
 369                 if (dbus_connection_dispatch(m->bus) == DBUS_DISPATCH_COMPLETE) {
 370                         m->request_bus_dispatch = false;
 371                         return 1;
 372                 }
 373
 374         if (m->request_system_bus_dispatch)
 375                 if (dbus_connection_dispatch(m->system_bus) == DBUS_DISPATCH_COMPLETE) {
 376                         m->request_system_bus_dispatch = false;
 377                         return 1;
 378                 }
 379
 380         return 0;
 381 }
 382
 383 static int request_name(Manager *m) {
 384         DBusMessage *message;
 385         const char *name = "org.freedesktop.systemd1";
 386         uint32_t flags = 0;
 387
 388         if (!(message = dbus_message_new_method_call(
 389                               DBUS_SERVICE_DBUS,
 390                               DBUS_PATH_DBUS,
 391                               DBUS_INTERFACE_DBUS,
 392                               "RequestName")))
 393                 return -ENOMEM;
 394
 395         if (!dbus_message_append_args(
 396                             message,
 397                             DBUS_TYPE_STRING, &name,
 398                             DBUS_TYPE_UINT32, &flags,
 399                             DBUS_TYPE_INVALID)) {
 400                 dbus_message_unref(message);
 401                 return -ENOMEM;
 402         }
 403
 404         if (!dbus_connection_send(m->bus, message, NULL)) {
 405                 dbus_message_unref(message);
 406                 return -ENOMEM;
 407         }
 408
 409         /* We simple ask for the name and don't wait for it. Sooner or
 410          * later we'll have it, and we wouldn't know what to do on
 411          * error anyway. */
 412
 413         dbus_message_unref(message);
 414
 415         return 0;
 416 }
 417
 418 static int bus_setup_loop(Manager *m, DBusConnection *bus) {
 419         assert(m);
 420         assert(bus);
 421
 422         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 423         if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 424             !dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL))
 425                 return -ENOMEM;
 426
 427         return 0;
 428 }
 429
 430 int bus_init(Manager *m) {
 431         DBusError error;
 432         char *id;
 433         int r;
 434
 435         assert(m);
 436
 437         if (m->bus)
 438                 return 0;
 439
 440         if (!(m->subscribed = set_new(string_hash_func, string_compare_func)))
 441                 return -ENOMEM;
 442
 443         dbus_connection_set_change_sigpipe(FALSE);
 444
 445         dbus_error_init(&error);
 446         if (!(m->bus = dbus_bus_get_private(m->running_as == MANAGER_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
 447                 log_error("Failed to get D-Bus connection: %s", error.message);
 448                 dbus_error_free(&error);
 449                 bus_done(m);
 450                 return -ECONNREFUSED;
 451         }
 452
 453         if ((r = bus_setup_loop(m, m->bus)) < 0) {
 454                 bus_done(m);
 455                 return r;
 456         }
 457
 458         dbus_connection_set_dispatch_status_function(m->bus, bus_dispatch_status, m, NULL);
 459
 460         if (m->running_as == MANAGER_SESSION) {
 461                 if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
 462                         log_error("Failed to get D-Bus connection: %s", error.message);
 463                         dbus_error_free(&error);
 464                         bus_done(m);
 465                         return -ECONNREFUSED;
 466                 }
 467
 468                 if ((r = bus_setup_loop(m, m->system_bus)) < 0) {
 469                         bus_done(m);
 470                         return r;
 471                 }
 472
 473                 dbus_connection_set_dispatch_status_function(m->system_bus, system_bus_dispatch_status, m, NULL);
 474         } else
 475                 m->system_bus = m->bus;
 476
 477         if (!dbus_connection_register_object_path(m->bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
 478             !dbus_connection_register_fallback(m->bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
 479             !dbus_connection_register_fallback(m->bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
 480             !dbus_connection_add_filter(m->bus, bus_message_filter, m, NULL) ||
 481             !dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) {
 482                 bus_done(m);
 483                 return -ENOMEM;
 484         }
 485
 486         dbus_bus_add_match(m->bus,
 487                            "type='signal',"
 488                            "sender='"DBUS_SERVICE_DBUS"',"
 489                            "interface='"DBUS_INTERFACE_DBUS"',"
 490                            "path='"DBUS_PATH_DBUS"'",
 491                            &error);
 492
 493         if (dbus_error_is_set(&error)) {
 494                 log_error("Failed to register match: %s", error.message);
 495                 dbus_error_free(&error);
 496                 return -ENOMEM;
 497         }
 498
 499         if ((r = request_name(m)) < 0) {
 500                 bus_done(m);
 501                 return r;
 502         }
 503
 504         dbus_bus_add_match(m->system_bus,
 505                            "type='signal',"
 506                            "interface='org.freedesktop.systemd1.Agent',"
 507                            "path='/org/freedesktop/systemd1/agent'",
 508                            &error);
 509
 510         if (dbus_error_is_set(&error)) {
 511                 log_error("Failed to register match: %s", error.message);
 512                 dbus_error_free(&error);
 513                 bus_done(m);
 514                 return -ENOMEM;
 515         }
 516
 517         log_debug("Successfully connected to D-Bus bus %s as %s",
 518                   strnull((id = dbus_connection_get_server_id(m->bus))),
 519                   strnull(dbus_bus_get_unique_name(m->bus)));
 520         dbus_free(id);
 521
 522         log_debug("Successfully connected to system D-Bus bus %s as %s",
 523                   strnull((id = dbus_connection_get_server_id(m->system_bus))),
 524                   strnull(dbus_bus_get_unique_name(m->system_bus)));
 525         dbus_free(id);
 526
 527         m->request_bus_dispatch = true;
 528         m->request_system_bus_dispatch = true;
 529
 530         return 0;
 531 }
 532
 533 void bus_done(Manager *m) {
 534         assert(m);
 535
 536         if (m->system_bus && m->system_bus != m->bus) {
 537                 dbus_connection_close(m->system_bus);
 538                 dbus_connection_unref(m->system_bus);
 539                 m->system_bus = NULL;
 540         }
 541
 542         if (m->bus) {
 543                 dbus_connection_close(m->bus);
 544                 dbus_connection_unref(m->bus);
 545                 m->bus = NULL;
 546         }
 547
 548         if (m->subscribed) {
 549                 char *c;
 550
 551                 while ((c = set_steal_first(m->subscribed)))
 552                         free(c);
 553
 554                 set_free(m->subscribed);
 555                 m->subscribed = NULL;
 556         }
 557 }
 558
 559 DBusHandlerResult bus_default_message_handler(Manager *m, DBusMessage *message, const char*introspection, const BusProperty *properties) {
 560         DBusError error;
 561         DBusMessage *reply = NULL;
 562         int r;
 563
 564         assert(m);
 565         assert(message);
 566
 567         dbus_error_init(&error);
 568
 569         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
 570
 571                 if (!(reply = dbus_message_new_method_return(message)))
 572                         goto oom;
 573
 574                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
 575                         goto oom;
 576
 577         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
 578                 const char *interface, *property;
 579                 const BusProperty *p;
 580
 581                 if (!dbus_message_get_args(
 582                             message,
 583                             &error,
 584                             DBUS_TYPE_STRING, &interface,
 585                             DBUS_TYPE_STRING, &property,
 586                             DBUS_TYPE_INVALID))
 587                         return bus_send_error_reply(m, message, &error, -EINVAL);
 588
 589                 for (p = properties; p->property; p++)
 590                         if (streq(p->interface, interface) && streq(p->property, property))
 591                                 break;
 592
 593                 if (p->property) {
 594                         DBusMessageIter iter, sub;
 595
 596                         if (!(reply = dbus_message_new_method_return(message)))
 597                                 goto oom;
 598
 599                         dbus_message_iter_init_append(reply, &iter);
 600
 601                         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
 602                                 goto oom;
 603
 604                         if ((r = p->append(m, &sub, property, p->data)) < 0) {
 605
 606                                 if (r == -ENOMEM)
 607                                         goto oom;
 608
 609                                 dbus_message_unref(reply);
 610                                 return bus_send_error_reply(m, message, NULL, r);
 611                         }
 612
 613                         if (!dbus_message_iter_close_container(&iter, &sub))
 614                                 goto oom;
 615                 }
 616         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
 617                 const char *interface;
 618                 const BusProperty *p;
 619                 DBusMessageIter iter, sub, sub2, sub3;
 620                 bool any = false;
 621
 622                 if (!dbus_message_get_args(
 623                             message,
 624                             &error,
 625                             DBUS_TYPE_STRING, &interface,
 626                             DBUS_TYPE_INVALID))
 627                         return bus_send_error_reply(m, message, &error, -EINVAL);
 628
 629                 if (!(reply = dbus_message_new_method_return(message)))
 630                         goto oom;
 631
 632                 dbus_message_iter_init_append(reply, &iter);
 633
 634                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
 635                         goto oom;
 636
 637                 for (p = properties; p->property; p++) {
 638                         if (!streq(p->interface, interface))
 639                                 continue;
 640
 641                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
 642                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
 643                             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
 644                                 goto oom;
 645
 646                         if ((r = p->append(m, &sub3, p->property, p->data)) < 0) {
 647
 648                                 if (r == -ENOMEM)
 649                                         goto oom;
 650
 651                                 dbus_message_unref(reply);
 652                                 return bus_send_error_reply(m, message, NULL, r);
 653                         }
 654
 655                         if (!dbus_message_iter_close_container(&sub2, &sub3) ||
 656                             !dbus_message_iter_close_container(&sub, &sub2))
 657                                 goto oom;
 658
 659                         any = true;
 660                 }
 661
 662                 if (!dbus_message_iter_close_container(&iter, &sub))
 663                         goto oom;
 664         }
 665
 666         if (reply) {
 667                 if (!dbus_connection_send(m->bus, reply, NULL))
 668                         goto oom;
 669
 670                 dbus_message_unref(reply);
 671                 return DBUS_HANDLER_RESULT_HANDLED;
 672         }
 673
 674         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 675
 676 oom:
 677         if (reply)
 678                 dbus_message_unref(reply);
 679
 680         dbus_error_free(&error);
 681
 682         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 683 }
 684
 685 static const char *error_to_dbus(int error) {
 686
 687         switch(error) {
 688
 689         case -EINVAL:
 690                 return DBUS_ERROR_INVALID_ARGS;
 691
 692         case -ENOMEM:
 693                 return DBUS_ERROR_NO_MEMORY;
 694
 695         case -EPERM:
 696         case -EACCES:
 697                 return DBUS_ERROR_ACCESS_DENIED;
 698
 699         case -ESRCH:
 700                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
 701
 702         case -ENOENT:
 703                 return DBUS_ERROR_FILE_NOT_FOUND;
 704
 705         case -EEXIST:
 706                 return DBUS_ERROR_FILE_EXISTS;
 707
 708         case -ETIMEDOUT:
 709                 return DBUS_ERROR_TIMEOUT;
 710
 711         case -EIO:
 712                 return DBUS_ERROR_IO_ERROR;
 713
 714         case -ENETRESET:
 715         case -ECONNABORTED:
 716         case -ECONNRESET:
 717                 return DBUS_ERROR_DISCONNECTED;
 718         }
 719
 720         return DBUS_ERROR_FAILED;
 721 }
 722
 723 DBusHandlerResult bus_send_error_reply(Manager *m, DBusMessage *message, DBusError *bus_error, int error) {
 724         DBusMessage *reply = NULL;
 725         const char *name, *text;
 726
 727         if (bus_error && dbus_error_is_set(bus_error)) {
 728                 name = bus_error->name;
 729                 text = bus_error->message;
 730         } else {
 731                 name = error_to_dbus(error);
 732                 text = strerror(-error);
 733         }
 734
 735         if (!(reply = dbus_message_new_error(message, name, text)))
 736                 goto oom;
 737
 738         if (!dbus_connection_send(m->bus, reply, NULL))
 739                 goto oom;
 740
 741         dbus_message_unref(reply);
 742
 743         if (bus_error)
 744                 dbus_error_free(bus_error);
 745
 746         return DBUS_HANDLER_RESULT_HANDLED;
 747
 748 oom:
 749         if (reply)
 750                 dbus_message_unref(reply);
 751
 752         if (bus_error)
 753                 dbus_error_free(bus_error);
 754
 755         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 756 }
 757
 758 int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 759         const char *t = data;
 760
 761         assert(m);
 762         assert(i);
 763         assert(property);
 764
 765         if (!t)
 766                 t = "";
 767
 768         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
 769                 return -ENOMEM;
 770
 771         return 0;
 772 }
 773
 774 int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 775         DBusMessageIter sub;
 776         char **t = data;
 777
 778         assert(m);
 779         assert(i);
 780         assert(property);
 781
 782         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
 783                 return -ENOMEM;
 784
 785         STRV_FOREACH(t, t)
 786                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
 787                         return -ENOMEM;
 788
 789         if (!dbus_message_iter_close_container(i, &sub))
 790                 return -ENOMEM;
 791
 792         return 0;
 793 }
 794
 795 int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 796         bool *b = data;
 797         dbus_bool_t db;
 798
 799         assert(m);
 800         assert(i);
 801         assert(property);
 802         assert(b);
 803
 804         db = *b;
 805
 806         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
 807                 return -ENOMEM;
 808
 809         return 0;
 810 }
 811
 812 int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 813         assert(m);
 814         assert(i);
 815         assert(property);
 816         assert(data);
 817
 818         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
 819                 return -ENOMEM;
 820
 821         return 0;
 822 }
 823
 824 int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 825         assert(m);
 826         assert(i);
 827         assert(property);
 828         assert(data);
 829
 830         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
 831                 return -ENOMEM;
 832
 833         return 0;
 834 }