src/dbus-common.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   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 <assert.h>
  23 #include <sys/socket.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <dbus/dbus.h>
  29 #include <string.h>
  30 #include <sys/epoll.h>
  31
  32 #include "log.h"
  33 #include "dbus-common.h"
  34 #include "util.h"
  35 #include "def.h"
  36 #include "strv.h"
  37
  38 int bus_check_peercred(DBusConnection *c) {
  39         int fd;
  40         struct ucred ucred;
  41         socklen_t l;
  42
  43         assert(c);
  44
  45         assert_se(dbus_connection_get_unix_fd(c, &fd));
  46
  47         l = sizeof(struct ucred);
  48         if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0) {
  49                 log_error("SO_PEERCRED failed: %m");
  50                 return -errno;
  51         }
  52
  53         if (l != sizeof(struct ucred)) {
  54                 log_error("SO_PEERCRED returned wrong size.");
  55                 return -E2BIG;
  56         }
  57
  58         if (ucred.uid != 0 && ucred.uid != geteuid())
  59                 return -EPERM;
  60
  61         return 1;
  62 }
  63
  64 static int sync_auth(DBusConnection *bus, DBusError *error) {
  65         usec_t begin, tstamp;
  66
  67         assert(bus);
  68
  69         /* This complexity should probably move into D-Bus itself:
  70          *
  71          * https://bugs.freedesktop.org/show_bug.cgi?id=35189 */
  72
  73         begin = tstamp = now(CLOCK_MONOTONIC);
  74         for (;;) {
  75
  76                 if (tstamp > begin + DEFAULT_TIMEOUT_USEC)
  77                         break;
  78
  79                 if (dbus_connection_get_is_authenticated(bus))
  80                         break;
  81
  82                 if (!dbus_connection_read_write_dispatch(bus, ((begin + DEFAULT_TIMEOUT_USEC - tstamp) + USEC_PER_MSEC - 1) / USEC_PER_MSEC))
  83                         break;
  84
  85                 tstamp = now(CLOCK_MONOTONIC);
  86         }
  87
  88         if (!dbus_connection_get_is_connected(bus)) {
  89                 dbus_set_error_const(error, DBUS_ERROR_NO_SERVER, "Connection terminated during authentication.");
  90                 return -ECONNREFUSED;
  91         }
  92
  93         if (!dbus_connection_get_is_authenticated(bus)) {
  94                 dbus_set_error_const(error, DBUS_ERROR_TIMEOUT, "Failed to authenticate in time.");
  95                 return -EACCES;
  96         }
  97
  98         return 0;
  99 }
 100
 101 int bus_connect(DBusBusType t, DBusConnection **_bus, bool *_private, DBusError *error) {
 102         DBusConnection *bus = NULL;
 103         int r;
 104         bool private = true;
 105
 106         assert(_bus);
 107
 108         if (geteuid() == 0 && t == DBUS_BUS_SYSTEM) {
 109                 /* If we are root, then let's talk directly to the
 110                  * system instance, instead of going via the bus */
 111
 112                 bus = dbus_connection_open_private("unix:path=/run/systemd/private", error);
 113                 if (!bus)
 114                         return -EIO;
 115
 116         } else {
 117                 if (t == DBUS_BUS_SESSION) {
 118                         const char *e;
 119
 120                         /* If we are supposed to talk to the instance,
 121                          * try via XDG_RUNTIME_DIR first, then
 122                          * fallback to normal bus access */
 123
 124                         e = getenv("XDG_RUNTIME_DIR");
 125                         if (e) {
 126                                 char *p;
 127
 128                                 if (asprintf(&p, "unix:path=%s/systemd/private", e) < 0)
 129                                         return -ENOMEM;
 130
 131                                 bus = dbus_connection_open_private(p, NULL);
 132                                 free(p);
 133                         }
 134                 }
 135
 136                 if (!bus) {
 137                         bus = dbus_bus_get_private(t, error);
 138                         if (!bus)
 139                                 return -EIO;
 140
 141                         private = false;
 142                 }
 143         }
 144
 145         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 146
 147         if (private) {
 148                 if (bus_check_peercred(bus) < 0) {
 149                         dbus_connection_close(bus);
 150                         dbus_connection_unref(bus);
 151
 152                         dbus_set_error_const(error, DBUS_ERROR_ACCESS_DENIED, "Failed to verify owner of bus.");
 153                         return -EACCES;
 154                 }
 155         }
 156
 157         r = sync_auth(bus, error);
 158         if (r < 0) {
 159                 dbus_connection_close(bus);
 160                 dbus_connection_unref(bus);
 161                 return r;
 162         }
 163
 164         if (_private)
 165                 *_private = private;
 166
 167         *_bus = bus;
 168         return 0;
 169 }
 170
 171 int bus_connect_system_ssh(const char *user, const char *host, DBusConnection **_bus, DBusError *error) {
 172         DBusConnection *bus;
 173         char *p = NULL;
 174         int r;
 175
 176         assert(_bus);
 177         assert(user || host);
 178
 179         if (user && host)
 180                 asprintf(&p, "exec:path=ssh,argv1=-xT,argv2=%s@%s,argv3=systemd-stdio-bridge", user, host);
 181         else if (user)
 182                 asprintf(&p, "exec:path=ssh,argv1=-xT,argv2=%s@localhost,argv3=systemd-stdio-bridge", user);
 183         else if (host)
 184                 asprintf(&p, "exec:path=ssh,argv1=-xT,argv2=%s,argv3=systemd-stdio-bridge", host);
 185
 186         if (!p) {
 187                 dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
 188                 return -ENOMEM;
 189         }
 190
 191         bus = dbus_connection_open_private(p, error);
 192         free(p);
 193
 194         if (!bus)
 195                 return -EIO;
 196
 197         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 198
 199         if ((r = sync_auth(bus, error)) < 0) {
 200                 dbus_connection_close(bus);
 201                 dbus_connection_unref(bus);
 202                 return r;
 203         }
 204
 205         if (!dbus_bus_register(bus, error)) {
 206                 dbus_connection_close(bus);
 207                 dbus_connection_unref(bus);
 208                 return r;
 209         }
 210
 211         *_bus = bus;
 212         return 0;
 213 }
 214
 215 int bus_connect_system_polkit(DBusConnection **_bus, DBusError *error) {
 216         DBusConnection *bus;
 217         int r;
 218
 219         assert(_bus);
 220
 221         /* Don't bother with PolicyKit if we are root */
 222         if (geteuid() == 0)
 223                 return bus_connect(DBUS_BUS_SYSTEM, _bus, NULL, error);
 224
 225         if (!(bus = dbus_connection_open_private("exec:path=pkexec,argv1=" SYSTEMD_STDIO_BRIDGE_BINARY_PATH, error)))
 226                 return -EIO;
 227
 228         dbus_connection_set_exit_on_disconnect(bus, FALSE);
 229
 230         if ((r = sync_auth(bus, error)) < 0) {
 231                 dbus_connection_close(bus);
 232                 dbus_connection_unref(bus);
 233                 return r;
 234         }
 235
 236         if (!dbus_bus_register(bus, error)) {
 237                 dbus_connection_close(bus);
 238                 dbus_connection_unref(bus);
 239                 return r;
 240         }
 241
 242         *_bus = bus;
 243         return 0;
 244 }
 245
 246 const char *bus_error_message(const DBusError *error) {
 247         assert(error);
 248
 249         /* Sometimes the D-Bus server is a little bit too verbose with
 250          * its error messages, so let's override them here */
 251         if (dbus_error_has_name(error, DBUS_ERROR_ACCESS_DENIED))
 252                 return "Access denied";
 253
 254         return error->message;
 255 }
 256
 257 DBusHandlerResult bus_default_message_handler(
 258                 DBusConnection *c,
 259                 DBusMessage *message,
 260                 const char *introspection,
 261                 const char *interfaces,
 262                 const BusBoundProperties *bound_properties) {
 263
 264         DBusError error;
 265         DBusMessage *reply = NULL;
 266         int r;
 267
 268         assert(c);
 269         assert(message);
 270
 271         dbus_error_init(&error);
 272
 273         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect") && introspection) {
 274
 275                 if (!(reply = dbus_message_new_method_return(message)))
 276                         goto oom;
 277
 278                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID))
 279                         goto oom;
 280
 281         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Get") && bound_properties) {
 282                 const char *interface, *property;
 283                 const BusBoundProperties *bp;
 284                 const BusProperty *p;
 285                 void *data;
 286                 DBusMessageIter iter, sub;
 287
 288                 if (!dbus_message_get_args(
 289                             message,
 290                             &error,
 291                             DBUS_TYPE_STRING, &interface,
 292                             DBUS_TYPE_STRING, &property,
 293                             DBUS_TYPE_INVALID))
 294                         return bus_send_error_reply(c, message, &error, -EINVAL);
 295
 296                 for (bp = bound_properties; bp->interface; bp++) {
 297                         if (!streq(bp->interface, interface))
 298                                 continue;
 299
 300                         for (p = bp->properties; p->property; p++)
 301                                 if (streq(p->property, property))
 302                                         goto get_prop;
 303                 }
 304
 305                 /* no match */
 306                 if (!nulstr_contains(interfaces, interface))
 307                         dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface");
 308                 else
 309                         dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_PROPERTY, "Unknown property");
 310
 311                 return bus_send_error_reply(c, message, &error, -EINVAL);
 312
 313 get_prop:
 314                 reply = dbus_message_new_method_return(message);
 315                 if (!reply)
 316                         goto oom;
 317
 318                 dbus_message_iter_init_append(reply, &iter);
 319
 320                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT, p->signature, &sub))
 321                         goto oom;
 322
 323                 data = (char*)bp->base + p->offset;
 324                 if (p->indirect)
 325                         data = *(void**)data;
 326                 r = p->append(&sub, property, data);
 327                 if (r < 0) {
 328                         if (r == -ENOMEM)
 329                                 goto oom;
 330
 331                         dbus_message_unref(reply);
 332                         return bus_send_error_reply(c, message, NULL, r);
 333                 }
 334
 335                 if (!dbus_message_iter_close_container(&iter, &sub))
 336                         goto oom;
 337
 338         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "GetAll") && bound_properties) {
 339                 const char *interface;
 340                 const BusBoundProperties *bp;
 341                 const BusProperty *p;
 342                 DBusMessageIter iter, sub, sub2, sub3;
 343
 344                 if (!dbus_message_get_args(
 345                             message,
 346                             &error,
 347                             DBUS_TYPE_STRING, &interface,
 348                             DBUS_TYPE_INVALID))
 349                         return bus_send_error_reply(c, message, &error, -EINVAL);
 350
 351                 if (interface[0] && !nulstr_contains(interfaces, interface)) {
 352                         dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface");
 353                         return bus_send_error_reply(c, message, &error, -EINVAL);
 354                 }
 355
 356                 if (!(reply = dbus_message_new_method_return(message)))
 357                         goto oom;
 358
 359                 dbus_message_iter_init_append(reply, &iter);
 360
 361                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub))
 362                         goto oom;
 363
 364                 for (bp = bound_properties; bp->interface; bp++) {
 365                         if (interface[0] && !streq(bp->interface, interface))
 366                                 continue;
 367
 368                         for (p = bp->properties; p->property; p++) {
 369                                 void *data;
 370
 371                                 if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_DICT_ENTRY, NULL, &sub2) ||
 372                                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &p->property) ||
 373                                     !dbus_message_iter_open_container(&sub2, DBUS_TYPE_VARIANT, p->signature, &sub3))
 374                                         goto oom;
 375
 376                                 data = (char*)bp->base + p->offset;
 377                                 if (p->indirect)
 378                                         data = *(void**)data;
 379                                 r = p->append(&sub3, p->property, data);
 380                                 if (r < 0) {
 381                                         if (r == -ENOMEM)
 382                                                 goto oom;
 383
 384                                         dbus_message_unref(reply);
 385                                         return bus_send_error_reply(c, message, NULL, r);
 386                                 }
 387
 388                                 if (!dbus_message_iter_close_container(&sub2, &sub3) ||
 389                                     !dbus_message_iter_close_container(&sub, &sub2))
 390                                         goto oom;
 391                         }
 392                 }
 393
 394                 if (!dbus_message_iter_close_container(&iter, &sub))
 395                         goto oom;
 396
 397         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Properties", "Set") && bound_properties) {
 398                 const char *interface, *property;
 399                 DBusMessageIter iter;
 400                 const BusBoundProperties *bp;
 401                 const BusProperty *p;
 402                 DBusMessageIter sub;
 403                 char *sig;
 404
 405                 if (!dbus_message_iter_init(message, &iter) ||
 406                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 407                         return bus_send_error_reply(c, message, NULL, -EINVAL);
 408
 409                 dbus_message_iter_get_basic(&iter, &interface);
 410
 411                 if (!dbus_message_iter_next(&iter) ||
 412                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 413                         return bus_send_error_reply(c, message, NULL, -EINVAL);
 414
 415                 dbus_message_iter_get_basic(&iter, &property);
 416
 417                 if (!dbus_message_iter_next(&iter) ||
 418                     dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT ||
 419                     dbus_message_iter_has_next(&iter))
 420                         return bus_send_error_reply(c, message, NULL, -EINVAL);
 421
 422                 for (bp = bound_properties; bp->interface; bp++) {
 423                         if (!streq(bp->interface, interface))
 424                                 continue;
 425
 426                         for (p = bp->properties; p->property; p++)
 427                                 if (streq(p->property, property))
 428                                         goto set_prop;
 429                 }
 430
 431                 /* no match */
 432                 if (!nulstr_contains(interfaces, interface))
 433                         dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface");
 434                 else
 435                         dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_PROPERTY, "Unknown property");
 436
 437                 return bus_send_error_reply(c, message, &error, -EINVAL);
 438
 439 set_prop:
 440                 if (!p->set) {
 441                         dbus_set_error_const(&error, DBUS_ERROR_PROPERTY_READ_ONLY, "Property read-only");
 442                         return bus_send_error_reply(c, message, &error, -EINVAL);
 443                 }
 444
 445                 dbus_message_iter_recurse(&iter, &sub);
 446
 447                 sig = dbus_message_iter_get_signature(&sub);
 448                 if (!sig)
 449                         goto oom;
 450
 451                 if (!streq(sig, p->signature)) {
 452                         dbus_free(sig);
 453                         return bus_send_error_reply(c, message, NULL, -EINVAL);
 454                 }
 455
 456                 dbus_free(sig);
 457
 458                 r = p->set(&sub, property);
 459                 if (r < 0) {
 460                         if (r == -ENOMEM)
 461                                 goto oom;
 462                         return bus_send_error_reply(c, message, NULL, r);
 463                 }
 464
 465                 reply = dbus_message_new_method_return(message);
 466                 if (!reply)
 467                         goto oom;
 468         } else {
 469                 const char *interface = dbus_message_get_interface(message);
 470
 471                 if (!interface || !nulstr_contains(interfaces, interface)) {
 472                         dbus_set_error_const(&error, DBUS_ERROR_UNKNOWN_INTERFACE, "Unknown interface");
 473                         return bus_send_error_reply(c, message, &error, -EINVAL);
 474                 }
 475         }
 476
 477         if (reply) {
 478                 if (!dbus_connection_send(c, reply, NULL))
 479                         goto oom;
 480
 481                 dbus_message_unref(reply);
 482                 return DBUS_HANDLER_RESULT_HANDLED;
 483         }
 484
 485         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 486
 487 oom:
 488         if (reply)
 489                 dbus_message_unref(reply);
 490
 491         dbus_error_free(&error);
 492
 493         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 494 }
 495
 496 int bus_property_append_string(DBusMessageIter *i, const char *property, void *data) {
 497         const char *t = data;
 498
 499         assert(i);
 500         assert(property);
 501
 502         if (!t)
 503                 t = "";
 504
 505         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t))
 506                 return -ENOMEM;
 507
 508         return 0;
 509 }
 510
 511 int bus_property_append_strv(DBusMessageIter *i, const char *property, void *data) {
 512         char **t = data;
 513
 514         assert(i);
 515         assert(property);
 516
 517         return bus_append_strv_iter(i, t);
 518 }
 519
 520 int bus_property_append_bool(DBusMessageIter *i, const char *property, void *data) {
 521         bool *b = data;
 522         dbus_bool_t db;
 523
 524         assert(i);
 525         assert(property);
 526         assert(b);
 527
 528         db = *b;
 529
 530         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
 531                 return -ENOMEM;
 532
 533         return 0;
 534 }
 535
 536 int bus_property_append_tristate_false(DBusMessageIter *i, const char *property, void *data) {
 537         int *b = data;
 538         dbus_bool_t db;
 539
 540         assert(i);
 541         assert(property);
 542         assert(b);
 543
 544         db = *b > 0;
 545
 546         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &db))
 547                 return -ENOMEM;
 548
 549         return 0;
 550 }
 551
 552 int bus_property_append_uint64(DBusMessageIter *i, const char *property, void *data) {
 553         assert(i);
 554         assert(property);
 555         assert(data);
 556
 557         /* Let's ensure that usec_t is actually 64bit, and hence this
 558          * function can be used for usec_t */
 559         assert_cc(sizeof(uint64_t) == sizeof(usec_t));
 560
 561         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, data))
 562                 return -ENOMEM;
 563
 564         return 0;
 565 }
 566
 567 int bus_property_append_uint32(DBusMessageIter *i, const char *property, void *data) {
 568         assert(i);
 569         assert(property);
 570         assert(data);
 571
 572         /* Let's ensure that pid_t, mode_t, uid_t, gid_t are actually
 573          * 32bit, and hence this function can be used for
 574          * pid_t/mode_t/uid_t/gid_t */
 575         assert_cc(sizeof(uint32_t) == sizeof(pid_t));
 576         assert_cc(sizeof(uint32_t) == sizeof(mode_t));
 577         assert_cc(sizeof(uint32_t) == sizeof(unsigned));
 578         assert_cc(sizeof(uint32_t) == sizeof(uid_t));
 579         assert_cc(sizeof(uint32_t) == sizeof(gid_t));
 580
 581         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, data))
 582                 return -ENOMEM;
 583
 584         return 0;
 585 }
 586
 587 int bus_property_append_int32(DBusMessageIter *i, const char *property, void *data) {
 588         assert(i);
 589         assert(property);
 590         assert(data);
 591
 592         assert_cc(sizeof(int32_t) == sizeof(int));
 593
 594         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, data))
 595                 return -ENOMEM;
 596
 597         return 0;
 598 }
 599
 600 int bus_property_append_size(DBusMessageIter *i, const char *property, void *data) {
 601         uint64_t u;
 602
 603         assert(i);
 604         assert(property);
 605         assert(data);
 606
 607         u = (uint64_t) *(size_t*) data;
 608
 609         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 610                 return -ENOMEM;
 611
 612         return 0;
 613 }
 614
 615 int bus_property_append_ul(DBusMessageIter *i, const char *property, void *data) {
 616         uint64_t u;
 617
 618         assert(i);
 619         assert(property);
 620         assert(data);
 621
 622         u = (uint64_t) *(unsigned long*) data;
 623
 624         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 625                 return -ENOMEM;
 626
 627         return 0;
 628 }
 629
 630 int bus_property_append_long(DBusMessageIter *i, const char *property, void *data) {
 631         int64_t l;
 632
 633         assert(i);
 634         assert(property);
 635         assert(data);
 636
 637         l = (int64_t) *(long*) data;
 638
 639         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT64, &l))
 640                 return -ENOMEM;
 641
 642         return 0;
 643 }
 644
 645 const char *bus_errno_to_dbus(int error) {
 646
 647         switch(error) {
 648
 649         case -EINVAL:
 650                 return DBUS_ERROR_INVALID_ARGS;
 651
 652         case -ENOMEM:
 653                 return DBUS_ERROR_NO_MEMORY;
 654
 655         case -EPERM:
 656         case -EACCES:
 657                 return DBUS_ERROR_ACCESS_DENIED;
 658
 659         case -ESRCH:
 660                 return DBUS_ERROR_UNIX_PROCESS_ID_UNKNOWN;
 661
 662         case -ENOENT:
 663                 return DBUS_ERROR_FILE_NOT_FOUND;
 664
 665         case -EEXIST:
 666                 return DBUS_ERROR_FILE_EXISTS;
 667
 668         case -ETIMEDOUT:
 669         case -ETIME:
 670                 return DBUS_ERROR_TIMEOUT;
 671
 672         case -EIO:
 673                 return DBUS_ERROR_IO_ERROR;
 674
 675         case -ENETRESET:
 676         case -ECONNABORTED:
 677         case -ECONNRESET:
 678                 return DBUS_ERROR_DISCONNECTED;
 679         }
 680
 681         return DBUS_ERROR_FAILED;
 682 }
 683
 684 DBusHandlerResult bus_send_error_reply(DBusConnection *c, DBusMessage *message, DBusError *berror, int error) {
 685         DBusMessage *reply = NULL;
 686         const char *name, *text;
 687
 688         if (berror && dbus_error_is_set(berror)) {
 689                 name = berror->name;
 690                 text = berror->message;
 691         } else {
 692                 name = bus_errno_to_dbus(error);
 693                 text = strerror(-error);
 694         }
 695
 696         if (!(reply = dbus_message_new_error(message, name, text)))
 697                 goto oom;
 698
 699         if (!dbus_connection_send(c, reply, NULL))
 700                 goto oom;
 701
 702         dbus_message_unref(reply);
 703
 704         if (berror)
 705                 dbus_error_free(berror);
 706
 707         return DBUS_HANDLER_RESULT_HANDLED;
 708
 709 oom:
 710         if (reply)
 711                 dbus_message_unref(reply);
 712
 713         if (berror)
 714                 dbus_error_free(berror);
 715
 716         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 717 }
 718
 719 DBusMessage* bus_properties_changed_new(const char *path, const char *interface, const char *properties) {
 720         DBusMessage *m;
 721         DBusMessageIter iter, sub;
 722         const char *i;
 723
 724         assert(interface);
 725         assert(properties);
 726
 727         if (!(m = dbus_message_new_signal(path, "org.freedesktop.DBus.Properties", "PropertiesChanged")))
 728                 goto oom;
 729
 730         dbus_message_iter_init_append(m, &iter);
 731
 732         /* We won't send any property values, since they might be
 733          * large and sometimes not cheap to generated */
 734
 735         if (!dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &interface) ||
 736             !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "{sv}", &sub) ||
 737             !dbus_message_iter_close_container(&iter, &sub) ||
 738             !dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "s", &sub))
 739                 goto oom;
 740
 741         NULSTR_FOREACH(i, properties)
 742                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &i))
 743                         goto oom;
 744
 745         if (!dbus_message_iter_close_container(&iter, &sub))
 746                 goto oom;
 747
 748         return m;
 749
 750 oom:
 751         if (m)
 752                 dbus_message_unref(m);
 753
 754         return NULL;
 755 }
 756
 757 uint32_t bus_flags_to_events(DBusWatch *bus_watch) {
 758         unsigned flags;
 759         uint32_t events = 0;
 760
 761         assert(bus_watch);
 762
 763         /* no watch flags for disabled watches */
 764         if (!dbus_watch_get_enabled(bus_watch))
 765                 return 0;
 766
 767         flags = dbus_watch_get_flags(bus_watch);
 768
 769         if (flags & DBUS_WATCH_READABLE)
 770                 events |= EPOLLIN;
 771         if (flags & DBUS_WATCH_WRITABLE)
 772                 events |= EPOLLOUT;
 773
 774         return events | EPOLLHUP | EPOLLERR;
 775 }
 776
 777 unsigned bus_events_to_flags(uint32_t events) {
 778         unsigned flags = 0;
 779
 780         if (events & EPOLLIN)
 781                 flags |= DBUS_WATCH_READABLE;
 782         if (events & EPOLLOUT)
 783                 flags |= DBUS_WATCH_WRITABLE;
 784         if (events & EPOLLHUP)
 785                 flags |= DBUS_WATCH_HANGUP;
 786         if (events & EPOLLERR)
 787                 flags |= DBUS_WATCH_ERROR;
 788
 789         return flags;
 790 }
 791
 792 int bus_parse_strv(DBusMessage *m, char ***_l) {
 793         DBusMessageIter iter;
 794
 795         assert(m);
 796         assert(_l);
 797
 798         if (!dbus_message_iter_init(m, &iter))
 799                 return -EINVAL;
 800
 801         return bus_parse_strv_iter(&iter, _l);
 802 }
 803
 804 int bus_parse_strv_iter(DBusMessageIter *iter, char ***_l) {
 805         DBusMessageIter sub;
 806         unsigned n = 0, i = 0;
 807         char **l;
 808
 809         assert(iter);
 810         assert(_l);
 811
 812         if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_ARRAY ||
 813             dbus_message_iter_get_element_type(iter) != DBUS_TYPE_STRING)
 814             return -EINVAL;
 815
 816         dbus_message_iter_recurse(iter, &sub);
 817
 818         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
 819                 n++;
 820                 dbus_message_iter_next(&sub);
 821         }
 822
 823         if (!(l = new(char*, n+1)))
 824                 return -ENOMEM;
 825
 826         dbus_message_iter_recurse(iter, &sub);
 827
 828         while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
 829                 const char *s;
 830
 831                 assert_se(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
 832                 dbus_message_iter_get_basic(&sub, &s);
 833
 834                 if (!(l[i++] = strdup(s))) {
 835                         strv_free(l);
 836                         return -ENOMEM;
 837                 }
 838
 839                 dbus_message_iter_next(&sub);
 840         }
 841
 842         assert(i == n);
 843         l[i] = NULL;
 844
 845         if (_l)
 846                 *_l = l;
 847
 848         return 0;
 849 }
 850
 851 int bus_append_strv_iter(DBusMessageIter *iter, char **l) {
 852         DBusMessageIter sub;
 853
 854         assert(iter);
 855
 856         if (!dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY, "s", &sub))
 857                 return -ENOMEM;
 858
 859         STRV_FOREACH(l, l)
 860                 if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, l))
 861                         return -ENOMEM;
 862
 863         if (!dbus_message_iter_close_container(iter, &sub))
 864                 return -ENOMEM;
 865
 866         return 0;
 867 }
 868
 869 int bus_iter_get_basic_and_next(DBusMessageIter *iter, int type, void *data, bool next) {
 870
 871         assert(iter);
 872         assert(data);
 873
 874         if (dbus_message_iter_get_arg_type(iter) != type)
 875                 return -EIO;
 876
 877         dbus_message_iter_get_basic(iter, data);
 878
 879         if (!dbus_message_iter_next(iter) != !next)
 880                 return -EIO;
 881
 882         return 0;
 883 }
 884
 885 int generic_print_property(const char *name, DBusMessageIter *iter, bool all) {
 886         assert(name);
 887         assert(iter);
 888
 889         switch (dbus_message_iter_get_arg_type(iter)) {
 890
 891         case DBUS_TYPE_STRING: {
 892                 const char *s;
 893                 dbus_message_iter_get_basic(iter, &s);
 894
 895                 if (all || !isempty(s))
 896                         printf("%s=%s\n", name, s);
 897
 898                 return 1;
 899         }
 900
 901         case DBUS_TYPE_BOOLEAN: {
 902                 dbus_bool_t b;
 903
 904                 dbus_message_iter_get_basic(iter, &b);
 905                 printf("%s=%s\n", name, yes_no(b));
 906
 907                 return 1;
 908         }
 909
 910         case DBUS_TYPE_UINT64: {
 911                 uint64_t u;
 912                 dbus_message_iter_get_basic(iter, &u);
 913
 914                 /* Yes, heuristics! But we can change this check
 915                  * should it turn out to not be sufficient */
 916
 917                 if (endswith(name, "Timestamp")) {
 918                         char timestamp[FORMAT_TIMESTAMP_MAX], *t;
 919
 920                         t = format_timestamp(timestamp, sizeof(timestamp), u);
 921                         if (t || all)
 922                                 printf("%s=%s\n", name, strempty(t));
 923
 924                 } else if (strstr(name, "USec")) {
 925                         char timespan[FORMAT_TIMESPAN_MAX];
 926
 927                         printf("%s=%s\n", name, format_timespan(timespan, sizeof(timespan), u));
 928                 } else
 929                         printf("%s=%llu\n", name, (unsigned long long) u);
 930
 931                 return 1;
 932         }
 933
 934         case DBUS_TYPE_UINT32: {
 935                 uint32_t u;
 936                 dbus_message_iter_get_basic(iter, &u);
 937
 938                 if (strstr(name, "UMask") || strstr(name, "Mode"))
 939                         printf("%s=%04o\n", name, u);
 940                 else
 941                         printf("%s=%u\n", name, (unsigned) u);
 942
 943                 return 1;
 944         }
 945
 946         case DBUS_TYPE_INT32: {
 947                 int32_t i;
 948                 dbus_message_iter_get_basic(iter, &i);
 949
 950                 printf("%s=%i\n", name, (int) i);
 951                 return 1;
 952         }
 953
 954         case DBUS_TYPE_DOUBLE: {
 955                 double d;
 956                 dbus_message_iter_get_basic(iter, &d);
 957
 958                 printf("%s=%g\n", name, d);
 959                 return 1;
 960         }
 961
 962         case DBUS_TYPE_ARRAY:
 963
 964                 if (dbus_message_iter_get_element_type(iter) == DBUS_TYPE_STRING) {
 965                         DBusMessageIter sub;
 966                         bool space = false;
 967
 968                         dbus_message_iter_recurse(iter, &sub);
 969                         if (all ||
 970                             dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
 971                                 printf("%s=", name);
 972
 973                                 while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
 974                                         const char *s;
 975
 976                                         assert(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
 977                                         dbus_message_iter_get_basic(&sub, &s);
 978                                         printf("%s%s", space ? " " : "", s);
 979
 980                                         space = true;
 981                                         dbus_message_iter_next(&sub);
 982                                 }
 983
 984                                 puts("");
 985                         }
 986
 987                         return 1;
 988
 989                 } else if (dbus_message_iter_get_element_type(iter) == DBUS_TYPE_BYTE) {
 990                         DBusMessageIter sub;
 991
 992                         dbus_message_iter_recurse(iter, &sub);
 993                         if (all ||
 994                             dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
 995                                 printf("%s=", name);
 996
 997                                 while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
 998                                         uint8_t u;
 999
1000                                         assert(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_BYTE);
1001                                         dbus_message_iter_get_basic(&sub, &u);
1002                                         printf("%02x", u);
1003
1004                                         dbus_message_iter_next(&sub);
1005                                 }
1006
1007                                 puts("");
1008                         }
1009
1010                         return 1;
1011                 }
1012
1013                 break;
1014         }
1015
1016         return 0;
1017 }
1018
1019 static void release_name_pending_cb(DBusPendingCall *pending, void *userdata) {
1020         DBusMessage *reply;
1021         DBusConnection *bus = userdata;
1022
1023         assert_se(reply = dbus_pending_call_steal_reply(pending));
1024         dbus_message_unref(reply);
1025
1026         dbus_connection_close(bus);
1027 }
1028
1029 void bus_async_unregister_and_exit(DBusConnection *bus, const char *name) {
1030         DBusMessage *m = NULL;
1031         DBusPendingCall *pending = NULL;
1032
1033         assert(bus);
1034
1035         /* We unregister the name here, but we continue to process
1036          * requests, until we get the response for it, so that all
1037          * requests are guaranteed to be processed. */
1038
1039         m = dbus_message_new_method_call(
1040                         DBUS_SERVICE_DBUS,
1041                         DBUS_PATH_DBUS,
1042                         DBUS_INTERFACE_DBUS,
1043                         "ReleaseName");
1044         if (!m)
1045                 goto oom;
1046
1047         if (!dbus_message_append_args(
1048                             m,
1049                             DBUS_TYPE_STRING,
1050                             &name,
1051                             DBUS_TYPE_INVALID))
1052                 goto oom;
1053
1054         if (!dbus_connection_send_with_reply(bus, m, &pending, -1))
1055                 goto oom;
1056
1057         if (!dbus_pending_call_set_notify(pending, release_name_pending_cb, bus, NULL))
1058                 goto oom;
1059
1060         dbus_message_unref(m);
1061         dbus_pending_call_unref(pending);
1062
1063         return;
1064
1065 oom:
1066         log_error("Out of memory");
1067
1068         if (pending) {
1069                 dbus_pending_call_cancel(pending);
1070                 dbus_pending_call_unref(pending);
1071         }
1072
1073         if (m)
1074                 dbus_message_unref(m);
1075 }
1076
1077 DBusHandlerResult bus_exit_idle_filter(DBusConnection *bus, DBusMessage *m, void *userdata) {
1078         usec_t *remain_until = userdata;
1079
1080         assert(bus);
1081         assert(m);
1082         assert(remain_until);
1083
1084         /* Everytime we get a new message we reset out timeout */
1085         *remain_until = now(CLOCK_MONOTONIC) + DEFAULT_EXIT_USEC;
1086
1087         if (dbus_message_is_signal(m, DBUS_INTERFACE_LOCAL, "Disconnected"))
1088                 dbus_connection_close(bus);
1089
1090         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1091 }