dbus.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <dbus/dbus.h>
  23
  24 #include <sys/epoll.h>
  25 #include <sys/timerfd.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28
  29 #include "dbus.h"
  30 #include "log.h"
  31 #include "strv.h"
  32 #include "cgroup.h"
  33
  34 static void api_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
  35         Manager *m = data;
  36
  37         assert(bus);
  38         assert(m);
  39
  40         if (!m->api_bus)
  41                 return;
  42
  43         assert(m->api_bus == bus);
  44
  45         m->request_api_bus_dispatch = status != DBUS_DISPATCH_COMPLETE;
  46 }
  47
  48 static void system_bus_dispatch_status(DBusConnection *bus, DBusDispatchStatus status, void *data)  {
  49         Manager *m = data;
  50
  51         assert(bus);
  52         assert(m);
  53
  54         if (!m->system_bus)
  55                 return;
  56
  57         assert(m->system_bus == bus);
  58
  59         m->request_system_bus_dispatch = status != DBUS_DISPATCH_COMPLETE;
  60 }
  61
  62 static uint32_t bus_flags_to_events(DBusWatch *bus_watch) {
  63         unsigned flags;
  64         uint32_t events = 0;
  65
  66         assert(bus_watch);
  67
  68         /* no watch flags for disabled watches */
  69         if (!dbus_watch_get_enabled(bus_watch))
  70                 return 0;
  71
  72         flags = dbus_watch_get_flags(bus_watch);
  73
  74         if (flags & DBUS_WATCH_READABLE)
  75                 events |= EPOLLIN;
  76         if (flags & DBUS_WATCH_WRITABLE)
  77                 events |= EPOLLOUT;
  78
  79         return events | EPOLLHUP | EPOLLERR;
  80 }
  81
  82 static unsigned events_to_bus_flags(uint32_t events) {
  83         unsigned flags = 0;
  84
  85         if (events & EPOLLIN)
  86                 flags |= DBUS_WATCH_READABLE;
  87         if (events & EPOLLOUT)
  88                 flags |= DBUS_WATCH_WRITABLE;
  89         if (events & EPOLLHUP)
  90                 flags |= DBUS_WATCH_HANGUP;
  91         if (events & EPOLLERR)
  92                 flags |= DBUS_WATCH_ERROR;
  93
  94         return flags;
  95 }
  96
  97 void bus_watch_event(Manager *m, Watch *w, int events) {
  98         assert(m);
  99         assert(w);
 100
 101         /* This is called by the event loop whenever there is
 102          * something happening on D-Bus' file handles. */
 103
 104         if (!dbus_watch_get_enabled(w->data.bus_watch))
 105                 return;
 106
 107         dbus_watch_handle(w->data.bus_watch, events_to_bus_flags(events));
 108 }
 109
 110 static dbus_bool_t bus_add_watch(DBusWatch *bus_watch, void *data) {
 111         Manager *m = data;
 112         Watch *w;
 113         struct epoll_event ev;
 114
 115         assert(bus_watch);
 116         assert(m);
 117
 118         if (!(w = new0(Watch, 1)))
 119                 return FALSE;
 120
 121         w->fd = dbus_watch_get_unix_fd(bus_watch);
 122         w->type = WATCH_DBUS_WATCH;
 123         w->data.bus_watch = bus_watch;
 124
 125         zero(ev);
 126         ev.events = bus_flags_to_events(bus_watch);
 127         ev.data.ptr = w;
 128
 129         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
 130
 131                 if (errno != EEXIST) {
 132                         free(w);
 133                         return FALSE;
 134                 }
 135
 136                 /* Hmm, bloody D-Bus creates multiple watches on the
 137                  * same fd. epoll() does not like that. As a dirty
 138                  * hack we simply dup() the fd and hence get a second
 139                  * one we can safely add to the epoll(). */
 140
 141                 if ((w->fd = dup(w->fd)) < 0) {
 142                         free(w);
 143                         return FALSE;
 144                 }
 145
 146                 if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0) {
 147                         free(w);
 148                         close_nointr_nofail(w->fd);
 149                         return FALSE;
 150                 }
 151
 152                 w->fd_is_dupped = true;
 153         }
 154
 155         dbus_watch_set_data(bus_watch, w, NULL);
 156
 157         return TRUE;
 158 }
 159
 160 static void bus_remove_watch(DBusWatch *bus_watch, void *data) {
 161         Manager *m = data;
 162         Watch *w;
 163
 164         assert(bus_watch);
 165         assert(m);
 166
 167         if (!(w = dbus_watch_get_data(bus_watch)))
 168                 return;
 169
 170         assert(w->type == WATCH_DBUS_WATCH);
 171         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 172
 173         if (w->fd_is_dupped)
 174                 close_nointr_nofail(w->fd);
 175
 176         free(w);
 177 }
 178
 179 static void bus_toggle_watch(DBusWatch *bus_watch, void *data) {
 180         Manager *m = data;
 181         Watch *w;
 182         struct epoll_event ev;
 183
 184         assert(bus_watch);
 185         assert(m);
 186
 187         assert_se(w = dbus_watch_get_data(bus_watch));
 188         assert(w->type == WATCH_DBUS_WATCH);
 189
 190         zero(ev);
 191         ev.events = bus_flags_to_events(bus_watch);
 192         ev.data.ptr = w;
 193
 194         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_MOD, w->fd, &ev) == 0);
 195 }
 196
 197 static int bus_timeout_arm(Manager *m, Watch *w) {
 198         struct itimerspec its;
 199
 200         assert(m);
 201         assert(w);
 202
 203         zero(its);
 204
 205         if (dbus_timeout_get_enabled(w->data.bus_timeout)) {
 206                 timespec_store(&its.it_value, dbus_timeout_get_interval(w->data.bus_timeout) * USEC_PER_MSEC);
 207                 its.it_interval = its.it_interval;
 208         }
 209
 210         if (timerfd_settime(w->fd, 0, &its, NULL) < 0)
 211                 return -errno;
 212
 213         return 0;
 214 }
 215
 216 void bus_timeout_event(Manager *m, Watch *w, int events) {
 217         assert(m);
 218         assert(w);
 219
 220         /* This is called by the event loop whenever there is
 221          * something happening on D-Bus' file handles. */
 222
 223         if (!(dbus_timeout_get_enabled(w->data.bus_timeout)))
 224                 return;
 225
 226         dbus_timeout_handle(w->data.bus_timeout);
 227 }
 228
 229 static dbus_bool_t bus_add_timeout(DBusTimeout *timeout, void *data) {
 230         Manager *m = data;
 231         Watch *w;
 232         struct epoll_event ev;
 233
 234         assert(timeout);
 235         assert(m);
 236
 237         if (!(w = new0(Watch, 1)))
 238                 return FALSE;
 239
 240         if (!(w->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC)) < 0)
 241                 goto fail;
 242
 243         w->type = WATCH_DBUS_TIMEOUT;
 244         w->data.bus_timeout = timeout;
 245
 246         if (bus_timeout_arm(m, w) < 0)
 247                 goto fail;
 248
 249         zero(ev);
 250         ev.events = EPOLLIN;
 251         ev.data.ptr = w;
 252
 253         if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, w->fd, &ev) < 0)
 254                 goto fail;
 255
 256         dbus_timeout_set_data(timeout, w, NULL);
 257
 258         return TRUE;
 259
 260 fail:
 261         if (w->fd >= 0)
 262                 close_nointr_nofail(w->fd);
 263
 264         free(w);
 265         return FALSE;
 266 }
 267
 268 static void bus_remove_timeout(DBusTimeout *timeout, void *data) {
 269         Manager *m = data;
 270         Watch *w;
 271
 272         assert(timeout);
 273         assert(m);
 274
 275         if (!(w = dbus_timeout_get_data(timeout)))
 276                 return;
 277
 278         assert(w->type == WATCH_DBUS_TIMEOUT);
 279         assert_se(epoll_ctl(m->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 280         close_nointr_nofail(w->fd);
 281         free(w);
 282 }
 283
 284 static void bus_toggle_timeout(DBusTimeout *timeout, void *data) {
 285         Manager *m = data;
 286         Watch *w;
 287         int r;
 288
 289         assert(timeout);
 290         assert(m);
 291
 292         assert_se(w = dbus_timeout_get_data(timeout));
 293         assert(w->type == WATCH_DBUS_TIMEOUT);
 294
 295         if ((r = bus_timeout_arm(m, w)) < 0)
 296                 log_error("Failed to rearm timer: %s", strerror(-r));
 297 }
 298
 299 static DBusHandlerResult api_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
 300         Manager *m = data;
 301         DBusError error;
 302
 303         assert(connection);
 304         assert(message);
 305         assert(m);
 306
 307         dbus_error_init(&error);
 308
 309         /* log_debug("Got D-Bus request: %s.%s() on %s", */
 310         /*           dbus_message_get_interface(message), */
 311         /*           dbus_message_get_member(message), */
 312         /*           dbus_message_get_path(message)); */
 313
 314         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 315                 log_error("Warning! API D-Bus connection terminated.");
 316                 bus_done_api(m);
 317
 318         } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
 319                 const char *name, *old_owner, *new_owner;
 320
 321                 if (!dbus_message_get_args(message, &error,
 322                                            DBUS_TYPE_STRING, &name,
 323                                            DBUS_TYPE_STRING, &old_owner,
 324                                            DBUS_TYPE_STRING, &new_owner,
 325                                            DBUS_TYPE_INVALID))
 326                         log_error("Failed to parse NameOwnerChanged message: %s", error.message);
 327                 else  {
 328                         if (set_remove(m->subscribed, (char*) name))
 329                                 log_debug("Subscription client vanished: %s (left: %u)", name, set_size(m->subscribed));
 330
 331                         if (old_owner[0] == 0)
 332                                 old_owner = NULL;
 333
 334                         if (new_owner[0] == 0)
 335                                 new_owner = NULL;
 336
 337                         manager_dispatch_bus_name_owner_changed(m, name, old_owner, new_owner);
 338                 }
 339         }
 340
 341         dbus_error_free(&error);
 342         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 343 }
 344
 345 static DBusHandlerResult system_bus_message_filter(DBusConnection  *connection, DBusMessage  *message, void *data) {
 346         Manager *m = data;
 347         DBusError error;
 348
 349         assert(connection);
 350         assert(message);
 351         assert(m);
 352
 353         dbus_error_init(&error);
 354
 355         /* log_debug("Got D-Bus request: %s.%s() on %s", */
 356         /*           dbus_message_get_interface(message), */
 357         /*           dbus_message_get_member(message), */
 358         /*           dbus_message_get_path(message)); */
 359
 360         if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 361                 log_error("Warning! System D-Bus connection terminated.");
 362                 bus_done_system(m);
 363
 364         } if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
 365                 const char *cgroup;
 366
 367                 if (!dbus_message_get_args(message, &error,
 368                                            DBUS_TYPE_STRING, &cgroup,
 369                                            DBUS_TYPE_INVALID))
 370                         log_error("Failed to parse Released message: %s", error.message);
 371                 else
 372                         cgroup_notify_empty(m, cgroup);
 373         }
 374
 375         dbus_error_free(&error);
 376         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 377 }
 378
 379 unsigned bus_dispatch(Manager *m) {
 380         assert(m);
 381
 382         if (m->request_api_bus_dispatch) {
 383                 if (dbus_connection_dispatch(m->api_bus) == DBUS_DISPATCH_COMPLETE)
 384                         m->request_api_bus_dispatch = false;
 385
 386                 return 1;
 387         }
 388
 389         if (m->request_system_bus_dispatch) {
 390                 if (dbus_connection_dispatch(m->system_bus) == DBUS_DISPATCH_COMPLETE)
 391                         m->request_system_bus_dispatch = false;
 392
 393                 return 1;
 394         }
 395
 396         return 0;
 397 }
 398
 399 static void request_name_pending_cb(DBusPendingCall *pending, void *userdata) {
 400         DBusMessage *reply;
 401         DBusError error;
 402
 403         dbus_error_init(&error);
 404
 405         assert_se(reply = dbus_pending_call_steal_reply(pending));
 406
 407         switch (dbus_message_get_type(reply)) {
 408
 409         case DBUS_MESSAGE_TYPE_ERROR:
 410
 411                 assert_se(dbus_set_error_from_message(&error, reply));
 412                 log_warning("RequestName() failed: %s", error.message);
 413                 break;
 414
 415         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 416                 uint32_t r;
 417
 418                 if (!dbus_message_get_args(reply,
 419                                            &error,
 420                                            DBUS_TYPE_UINT32, &r,
 421                                            DBUS_TYPE_INVALID)) {
 422                         log_error("Failed to parse RequestName() reply: %s", error.message);
 423                         break;
 424                 }
 425
 426                 if (r == 1)
 427                         log_debug("Successfully acquired name.");
 428                 else
 429                         log_error("Name already owned.");
 430
 431                 break;
 432         }
 433
 434         default:
 435                 assert_not_reached("Invalid reply message");
 436         }
 437
 438         dbus_message_unref(reply);
 439         dbus_error_free(&error);
 440 }
 441
 442 static int request_name(Manager *m) {
 443         const char *name = "org.freedesktop.systemd1";
 444         uint32_t flags = 0;
 445         DBusMessage *message = NULL;
 446         DBusPendingCall *pending = NULL;
 447
 448         if (!(message = dbus_message_new_method_call(
 449                               DBUS_SERVICE_DBUS,
 450                               DBUS_PATH_DBUS,
 451                               DBUS_INTERFACE_DBUS,
 452                               "RequestName")))
 453                 goto oom;
 454
 455         if (!dbus_message_append_args(
 456                             message,
 457                             DBUS_TYPE_STRING, &name,
 458                             DBUS_TYPE_UINT32, &flags,
 459                             DBUS_TYPE_INVALID))
 460                 goto oom;
 461
 462         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
 463                 goto oom;
 464
 465         if (!dbus_pending_call_set_notify(pending, request_name_pending_cb, m, NULL))
 466                 goto oom;
 467
 468         dbus_message_unref(message);
 469         dbus_pending_call_unref(pending);
 470
 471         /* We simple ask for the name and don't wait for it. Sooner or
 472          * later we'll have it. */
 473
 474         return 0;
 475
 476 oom:
 477         if (pending) {
 478                 dbus_pending_call_cancel(pending);
 479                 dbus_pending_call_unref(pending);
 480         }
 481
 482         if (message)
 483                 dbus_message_unref(message);
 484
 485         return -ENOMEM;
 486 }
 487
 488 static int bus_setup_loop(Manager *m, DBusConnection *bus) {
 489         assert(m);
 490         assert(bus);
 491
 492         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 493
 494         if (!dbus_connection_set_watch_functions(bus, bus_add_watch, bus_remove_watch, bus_toggle_watch, m, NULL) ||
 495             !dbus_connection_set_timeout_functions(bus, bus_add_timeout, bus_remove_timeout, bus_toggle_timeout, m, NULL))
 496                 return -ENOMEM;
 497
 498         return 0;
 499 }
 500
 501 int bus_init_system(Manager *m) {
 502         DBusError error;
 503         char *id;
 504         int r;
 505
 506         assert(m);
 507
 508         dbus_error_init(&error);
 509
 510         if (m->system_bus)
 511                 return 0;
 512
 513         if (m->running_as != MANAGER_SESSION && m->api_bus)
 514                 m->system_bus = m->api_bus;
 515         else {
 516                 if (!(m->system_bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error))) {
 517                         log_debug("Failed to get system D-Bus connection, retrying later: %s", error.message);
 518                         dbus_error_free(&error);
 519                         return 0;
 520                 }
 521
 522                 dbus_connection_set_dispatch_status_function(m->system_bus, system_bus_dispatch_status, m, NULL);
 523                 m->request_system_bus_dispatch = true;
 524
 525                 if ((r = bus_setup_loop(m, m->system_bus)) < 0) {
 526                         bus_done_system(m);
 527                         return r;
 528                 }
 529         }
 530
 531         if (!dbus_connection_add_filter(m->system_bus, system_bus_message_filter, m, NULL)) {
 532                 bus_done_system(m);
 533                 return -ENOMEM;
 534         }
 535
 536         dbus_bus_add_match(m->system_bus,
 537                            "type='signal',"
 538                            "interface='org.freedesktop.systemd1.Agent',"
 539                            "path='/org/freedesktop/systemd1/agent'",
 540                            &error);
 541
 542         if (dbus_error_is_set(&error)) {
 543                 log_error("Failed to register match: %s", error.message);
 544                 dbus_error_free(&error);
 545                 bus_done_system(m);
 546                 return -ENOMEM;
 547         }
 548
 549         log_debug("Successfully connected to system D-Bus bus %s as %s",
 550                   strnull((id = dbus_connection_get_server_id(m->system_bus))),
 551                   strnull(dbus_bus_get_unique_name(m->system_bus)));
 552         dbus_free(id);
 553
 554         return 0;
 555 }
 556
 557 int bus_init_api(Manager *m) {
 558         DBusError error;
 559         char *id;
 560         int r;
 561
 562         assert(m);
 563
 564         dbus_error_init(&error);
 565
 566         if (m->api_bus)
 567                 return 0;
 568
 569         if (m->name_data_slot < 0)
 570                 if (!dbus_pending_call_allocate_data_slot(&m->name_data_slot))
 571                         return -ENOMEM;
 572
 573         if (m->running_as != MANAGER_SESSION && m->system_bus)
 574                 m->api_bus = m->system_bus;
 575         else {
 576                 if (!(m->api_bus = dbus_bus_get_private(m->running_as == MANAGER_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
 577                         log_debug("Failed to get API D-Bus connection, retrying later: %s", error.message);
 578                         dbus_error_free(&error);
 579                         return 0;
 580                 }
 581
 582                 dbus_connection_set_dispatch_status_function(m->api_bus, api_bus_dispatch_status, m, NULL);
 583                 m->request_api_bus_dispatch = true;
 584
 585                 if ((r = bus_setup_loop(m, m->api_bus)) < 0) {
 586                         bus_done_api(m);
 587                         return r;
 588                 }
 589         }
 590
 591         if (!dbus_connection_register_object_path(m->api_bus, "/org/freedesktop/systemd1", &bus_manager_vtable, m) ||
 592             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/unit", &bus_unit_vtable, m) ||
 593             !dbus_connection_register_fallback(m->api_bus, "/org/freedesktop/systemd1/job", &bus_job_vtable, m) ||
 594             !dbus_connection_add_filter(m->api_bus, api_bus_message_filter, m, NULL)) {
 595                 bus_done_api(m);
 596                 return -ENOMEM;
 597         }
 598
 599         dbus_bus_add_match(m->api_bus,
 600                            "type='signal',"
 601                            "sender='"DBUS_SERVICE_DBUS"',"
 602                            "interface='"DBUS_INTERFACE_DBUS"',"
 603                            "path='"DBUS_PATH_DBUS"'",
 604                            &error);
 605
 606         if (dbus_error_is_set(&error)) {
 607                 log_error("Failed to register match: %s", error.message);
 608                 dbus_error_free(&error);
 609                 bus_done_api(m);
 610                 return -ENOMEM;
 611         }
 612
 613         if ((r = request_name(m)) < 0) {
 614                 bus_done_api(m);
 615                 return r;
 616         }
 617
 618         log_debug("Successfully connected to API D-Bus bus %s as %s",
 619                   strnull((id = dbus_connection_get_server_id(m->api_bus))),
 620                   strnull(dbus_bus_get_unique_name(m->api_bus)));
 621         dbus_free(id);
 622
 623         if (!m->subscribed)
 624                 if (!(m->subscribed = set_new(string_hash_func, string_compare_func)))
 625                         return -ENOMEM;
 626
 627         return 0;
 628 }
 629
 630 void bus_done_api(Manager *m) {
 631         assert(m);
 632
 633         if (m->api_bus) {
 634                 if (m->system_bus == m->api_bus)
 635                         m->system_bus = NULL;
 636
 637                 dbus_connection_set_dispatch_status_function(m->api_bus, NULL, NULL, NULL);
 638                 dbus_connection_close(m->api_bus);
 639                 dbus_connection_unref(m->api_bus);
 640                 m->api_bus = NULL;
 641         }
 642
 643         if (m->subscribed) {
 644                 char *c;
 645
 646                 while ((c = set_steal_first(m->subscribed)))
 647                         free(c);
 648
 649                 set_free(m->subscribed);
 650                 m->subscribed = NULL;
 651         }
 652
 653        if (m->name_data_slot >= 0)
 654                dbus_pending_call_free_data_slot(&m->name_data_slot);
 655 }
 656
 657 void bus_done_system(Manager *m) {
 658         assert(m);
 659
 660         if (m->system_bus == m->api_bus)
 661                 bus_done_api(m);
 662
 663         if (m->system_bus) {
 664                 dbus_connection_set_dispatch_status_function(m->system_bus, NULL, NULL, NULL);
 665                 dbus_connection_close(m->system_bus);
 666                 dbus_connection_unref(m->system_bus);
 667                 m->system_bus = NULL;
 668         }
 669 }
 670
 671 static void query_pid_pending_cb(DBusPendingCall *pending, void *userdata) {
 672         Manager *m = userdata;
 673         DBusMessage *reply;
 674         DBusError error;
 675         const char *name;
 676
 677         dbus_error_init(&error);
 678
 679         assert_se(name = dbus_pending_call_get_data(pending, m->name_data_slot));
 680         assert_se(reply = dbus_pending_call_steal_reply(pending));
 681
 682         switch (dbus_message_get_type(reply)) {
 683
 684         case DBUS_MESSAGE_TYPE_ERROR:
 685
 686                 assert_se(dbus_set_error_from_message(&error, reply));
 687                 log_warning("GetConnectionUnixProcessID() failed: %s", error.message);
 688                 break;
 689
 690         case DBUS_MESSAGE_TYPE_METHOD_RETURN: {
 691                 uint32_t r;
 692
 693                 if (!dbus_message_get_args(reply,
 694                                            &error,
 695                                            DBUS_TYPE_UINT32, &r,
 696                                            DBUS_TYPE_INVALID)) {
 697                         log_error("Failed to parse GetConnectionUnixProcessID() reply: %s", error.message);
 698                         break;
 699                 }
 700
 701                 manager_dispatch_bus_query_pid_done(m, name, (pid_t) r);
 702                 break;
 703         }
 704
 705         default:
 706                 assert_not_reached("Invalid reply message");
 707         }
 708
 709         dbus_message_unref(reply);
 710         dbus_error_free(&error);
 711 }
 712
 713 int bus_query_pid(Manager *m, const char *name) {
 714         DBusMessage *message = NULL;
 715         DBusPendingCall *pending = NULL;
 716         char *n = NULL;
 717
 718         assert(m);
 719         assert(name);
 720
 721         if (!(message = dbus_message_new_method_call(
 722                               DBUS_SERVICE_DBUS,
 723                               DBUS_PATH_DBUS,
 724                               DBUS_INTERFACE_DBUS,
 725                               "GetConnectionUnixProcessID")))
 726                 goto oom;
 727
 728         if (!(dbus_message_append_args(
 729                               message,
 730                               DBUS_TYPE_STRING, &name,
 731                               DBUS_TYPE_INVALID)))
 732                 goto oom;
 733
 734         if (!dbus_connection_send_with_reply(m->api_bus, message, &pending, -1))
 735                 goto oom;
 736
 737         if (!(n = strdup(name)))
 738                 goto oom;
 739
 740         if (!dbus_pending_call_set_data(pending, m->name_data_slot, n, free))
 741                 goto oom;
 742
 743         n = NULL;
 744
 745         if (!dbus_pending_call_set_notify(pending, query_pid_pending_cb, m, NULL))
 746                 goto oom;
 747
 748         dbus_message_unref(message);
 749         dbus_pending_call_unref(pending);
 750
 751         return 0;
 752
 753 oom:
 754         free(n);
 755
 756         if (pending) {
 757                 dbus_pending_call_cancel(pending);
 758                 dbus_pending_call_unref(pending);
 759         }
 760
 761         if (message)
 762                 dbus_message_unref(message);
 763
 764         return -ENOMEM;
 765 }
 766
 767 DBusHandlerResult bus_default_message_handler(Manager *m, DBusMessage *message, const char*introspection, const BusProperty *properties) {
 768         DBusError error;
 769         DBusMessage *reply = NULL;
 770         int r;
 771
 772         assert(m);
 773         assert(message);
 774
 775         dbus_error_init(&error);
 776
 777         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
 778
 779                 if (!(reply = dbus_message_new_method_return(message)))
 780                         goto oom;
 781
 782                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
 783                         goto oom;
 784
 785         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && properties) {
 786                 const char *interface, *property;
 787                 const BusProperty *p;
 788
 789                 if (!dbus_message_get_args(
 790                             message,
 791                             &error,
 792                             DBUS_TYPE_STRING, &interface,
 793                             DBUS_TYPE_STRING, &property,
 794                             DBUS_TYPE_INVALID))
 795                         return bus_send_error_reply(m, message, &error, -EINVAL);
 796
 797                 for (p = properties; p->property; p++)
 798                         if (streq(p->interface, interface) && streq(p->property, property))
 799                                 break;
 800
 801                 if (p->property) {
 802                         DBusMessageIter iter, sub;
 803
 804                         if (!(reply = dbus_message_new_method_return(message)))
 805                                 goto oom;
 806
 807                         dbus_message_iter_init_append(reply, &iter);
 808
 809                         if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
 810                                 goto oom;
 811
 812                         if ((r = p->append(m, &sub, property, (void*) p->data)) < 0) {
 813
 814                                 if (r == -ENOMEM)
 815                                         goto oom;
 816
 817                                 dbus_message_unref(reply);
 818                                 return bus_send_error_reply(m, message, NULL, r);
 819                         }
 820
 821                         if (!dbus_message_iter_close_container(&iter, &sub))
 822                                 goto oom;
 823                 }
 824         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && properties) {
 825                 const char *interface;
 826                 const BusProperty *p;
 827                 DBusMessageIter iter, sub, sub2, sub3;
 828                 bool any = false;
 829
 830                 if (!dbus_message_get_args(
 831                             message,
 832                             &error,
 833                             DBUS_TYPE_STRING, &interface,
 834                             DBUS_TYPE_INVALID))
 835                         return bus_send_error_reply(m, message, &error, -EINVAL);
 836
 837                 if (!(reply = dbus_message_new_method_return(message)))
 838                         goto oom;
 839
 840                 dbus_message_iter_init_append(reply, &iter);
 841
 842                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
 843                         goto oom;
 844
 845                 for (p = properties; p->property; p++) {
 846                         if (!streq(p->interface, interface))
 847                                 continue;
 848
 849                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
 850                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
 851                             !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
 852                                 goto oom;
 853
 854                         if ((r = p->append(m, &sub3, p->property, (void*) p->data)) < 0) {
 855
 856                                 if (r == -ENOMEM)
 857                                         goto oom;
 858
 859                                 dbus_message_unref(reply);
 860                                 return bus_send_error_reply(m, message, NULL, r);
 861                         }
 862
 863                         if (!dbus_message_iter_close_container(&sub2, &sub3) ||
 864                             !dbus_message_iter_close_container(&sub, &sub2))
 865                                 goto oom;
 866
 867                         any = true;
 868                 }
 869
 870                 if (!dbus_message_iter_close_container(&iter, &sub))
 871                         goto oom;
 872         }
 873
 874         if (reply) {
 875                 if (!dbus_connection_send(m->api_bus, reply, NULL))
 876                         goto oom;
 877
 878                 dbus_message_unref(reply);
 879                 return DBUS_HANDLER_RESULT_HANDLED;
 880         }
 881
 882         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 883
 884 oom:
 885         if (reply)
 886                 dbus_message_unref(reply);
 887
 888         dbus_error_free(&error);
 889
 890         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 891 }
 892
 893 static const char *error_to_dbus(int error) {
 894
 895         switch(error) {
 896
 897         case -EINVAL:
 898                 return DBUS_ERROR_INVALID_ARGS;
 899
 900         case -ENOMEM:
 901                 return DBUS_ERROR_NO_MEMORY;
 902
 903         case -EPERM:
 904         case -EACCES:
 905                 return DBUS_ERROR_ACCESS_DENIED;
 906
 907         case -ESRCH:
 908                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
 909
 910         case -ENOENT:
 911                 return DBUS_ERROR_FILE_NOT_FOUND;
 912
 913         case -EEXIST:
 914                 return DBUS_ERROR_FILE_EXISTS;
 915
 916         case -ETIMEDOUT:
 917                 return DBUS_ERROR_TIMEOUT;
 918
 919         case -EIO:
 920                 return DBUS_ERROR_IO_ERROR;
 921
 922         case -ENETRESET:
 923         case -ECONNABORTED:
 924         case -ECONNRESET:
 925                 return DBUS_ERROR_DISCONNECTED;
 926         }
 927
 928         return DBUS_ERROR_FAILED;
 929 }
 930
 931 DBusHandlerResult bus_send_error_reply(Manager *m, DBusMessage *message, DBusError *bus_error, int error) {
 932         DBusMessage *reply = NULL;
 933         const char *name, *text;
 934
 935         if (bus_error && dbus_error_is_set(bus_error)) {
 936                 name = bus_error->name;
 937                 text = bus_error->message;
 938         } else {
 939                 name = error_to_dbus(error);
 940                 text = strerror(-error);
 941         }
 942
 943         if (!(reply = dbus_message_new_error(message, name, text)))
 944                 goto oom;
 945
 946         if (!dbus_connection_send(m->api_bus, reply, NULL))
 947                 goto oom;
 948
 949         dbus_message_unref(reply);
 950
 951         if (bus_error)
 952                 dbus_error_free(bus_error);
 953
 954         return DBUS_HANDLER_RESULT_HANDLED;
 955
 956 oom:
 957         if (reply)
 958                 dbus_message_unref(reply);
 959
 960         if (bus_error)
 961                 dbus_error_free(bus_error);
 962
 963         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 964 }
 965
 966 int bus_property_append_string(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 967         const char *t = data;
 968
 969         assert(m);
 970         assert(i);
 971         assert(property);
 972
 973         if (!t)
 974                 t = "";
 975
 976         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
 977                 return -ENOMEM;
 978
 979         return 0;
 980 }
 981
 982 int bus_property_append_strv(Manager *m, DBusMessageIter *i, const char *property, void *data) {
 983         DBusMessageIter sub;
 984         char **t = data;
 985
 986         assert(m);
 987         assert(i);
 988         assert(property);
 989
 990         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
 991                 return -ENOMEM;
 992
 993         STRV_FOREACH(t, t)
 994                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, t))
 995                         return -ENOMEM;
 996
 997         if (!dbus_message_iter_close_container(i, &sub))
 998                 return -ENOMEM;
 999
1000         return 0;
1001 }
1002
1003 int bus_property_append_bool(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1004         bool *b = data;
1005         dbus_bool_t db;
1006
1007         assert(m);
1008         assert(i);
1009         assert(property);
1010         assert(b);
1011
1012         db = *b;
1013
1014         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
1015                 return -ENOMEM;
1016
1017         return 0;
1018 }
1019
1020 int bus_property_append_uint64(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1021         assert(m);
1022         assert(i);
1023         assert(property);
1024         assert(data);
1025
1026         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
1027                 return -ENOMEM;
1028
1029         return 0;
1030 }
1031
1032 int bus_property_append_uint32(Manager *m, DBusMessageIter *i, const char *property, void *data) {
1033         assert(m);
1034         assert(i);
1035         assert(property);
1036         assert(data);
1037
1038         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
1039                 return -ENOMEM;
1040
1041         return 0;
1042 }