src/hostname/hostnamed.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <errno.h>
   4 #include <sys/utsname.h>
   5 #include <sys/stat.h>
   6 #include <sys/types.h>
   7 #include <unistd.h>
   8
   9 #include "alloc-util.h"
  10 #include "bus-common-errors.h"
  11 #include "bus-get-properties.h"
  12 #include "bus-log-control-api.h"
  13 #include "bus-polkit.h"
  14 #include "def.h"
  15 #include "env-file-label.h"
  16 #include "env-file.h"
  17 #include "env-util.h"
  18 #include "fileio-label.h"
  19 #include "fileio.h"
  20 #include "hostname-setup.h"
  21 #include "hostname-util.h"
  22 #include "id128-util.h"
  23 #include "json.h"
  24 #include "main-func.h"
  25 #include "missing_capability.h"
  26 #include "nscd-flush.h"
  27 #include "nulstr-util.h"
  28 #include "os-util.h"
  29 #include "parse-util.h"
  30 #include "path-util.h"
  31 #include "sd-device.h"
  32 #include "selinux-util.h"
  33 #include "service-util.h"
  34 #include "signal-util.h"
  35 #include "stat-util.h"
  36 #include "string-table.h"
  37 #include "strv.h"
  38 #include "user-util.h"
  39 #include "util.h"
  40 #include "virt.h"
  41
  42 #define VALID_DEPLOYMENT_CHARS (DIGITS LETTERS "-.:")
  43
  44 /* Properties we cache are indexed by an enum, to make invalidation easy and systematic (as we can iterate
  45  * through them all, and they are uniformly strings). */
  46 enum {
  47         /* Read from /etc/hostname */
  48         PROP_STATIC_HOSTNAME,
  49
  50         /* Read from /etc/machine-info */
  51         PROP_PRETTY_HOSTNAME,
  52         PROP_ICON_NAME,
  53         PROP_CHASSIS,
  54         PROP_DEPLOYMENT,
  55         PROP_LOCATION,
  56
  57         /* Read from /etc/os-release (or /usr/lib/os-release) */
  58         PROP_OS_PRETTY_NAME,
  59         PROP_OS_CPE_NAME,
  60         PROP_OS_HOME_URL,
  61         _PROP_MAX,
  62         _PROP_INVALID = -EINVAL,
  63 };
  64
  65 typedef struct Context {
  66         char *data[_PROP_MAX];
  67
  68         HostnameSource hostname_source;
  69
  70         struct stat etc_hostname_stat;
  71         struct stat etc_os_release_stat;
  72         struct stat etc_machine_info_stat;
  73
  74         Hashmap *polkit_registry;
  75 } Context;
  76
  77 static void context_reset(Context *c, uint64_t mask) {
  78         assert(c);
  79
  80         for (int p = 0; p < _PROP_MAX; p++) {
  81                 if (!FLAGS_SET(mask, UINT64_C(1) << p))
  82                         continue;
  83
  84                 c->data[p] = mfree(c->data[p]);
  85         }
  86 }
  87
  88 static void context_destroy(Context *c) {
  89         assert(c);
  90
  91         context_reset(c, UINT64_MAX);
  92         bus_verify_polkit_async_registry_free(c->polkit_registry);
  93 }
  94
  95 static void context_read_etc_hostname(Context *c) {
  96         struct stat current_stat = {};
  97         int r;
  98
  99         assert(c);
 100
 101         if (stat("/etc/hostname", &current_stat) >= 0 &&
 102             stat_inode_unmodified(&c->etc_hostname_stat, &current_stat))
 103                 return;
 104
 105         context_reset(c, UINT64_C(1) << PROP_STATIC_HOSTNAME);
 106
 107         r = read_etc_hostname(NULL, &c->data[PROP_STATIC_HOSTNAME]);
 108         if (r < 0 && r != -ENOENT)
 109                 log_warning_errno(r, "Failed to read /etc/hostname, ignoring: %m");
 110
 111         c->etc_hostname_stat = current_stat;
 112 }
 113
 114 static void context_read_machine_info(Context *c) {
 115         struct stat current_stat = {};
 116         int r;
 117
 118         assert(c);
 119
 120         if (stat("/etc/machine-info", &current_stat) >= 0 &&
 121             stat_inode_unmodified(&c->etc_machine_info_stat, &current_stat))
 122                 return;
 123
 124         context_reset(c,
 125                       (UINT64_C(1) << PROP_PRETTY_HOSTNAME) |
 126                       (UINT64_C(1) << PROP_ICON_NAME) |
 127                       (UINT64_C(1) << PROP_CHASSIS) |
 128                       (UINT64_C(1) << PROP_DEPLOYMENT) |
 129                       (UINT64_C(1) << PROP_LOCATION));
 130
 131         r = parse_env_file(NULL, "/etc/machine-info",
 132                            "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
 133                            "ICON_NAME", &c->data[PROP_ICON_NAME],
 134                            "CHASSIS", &c->data[PROP_CHASSIS],
 135                            "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
 136                            "LOCATION", &c->data[PROP_LOCATION]);
 137         if (r < 0 && r != -ENOENT)
 138                 log_warning_errno(r, "Failed to read /etc/machine-info, ignoring: %m");
 139
 140         c->etc_machine_info_stat = current_stat;
 141 }
 142
 143 static void context_read_os_release(Context *c) {
 144         struct stat current_stat = {};
 145         int r;
 146
 147         assert(c);
 148
 149         if ((stat("/etc/os-release", &current_stat) >= 0 ||
 150              stat("/usr/lib/os-release", &current_stat) >= 0) &&
 151             stat_inode_unmodified(&c->etc_os_release_stat, &current_stat))
 152                 return;
 153
 154         context_reset(c,
 155                       (UINT64_C(1) << PROP_OS_PRETTY_NAME) |
 156                       (UINT64_C(1) << PROP_OS_CPE_NAME) |
 157                       (UINT64_C(1) << PROP_OS_HOME_URL));
 158
 159         r = parse_os_release(NULL,
 160                              "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
 161                              "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
 162                              "HOME_URL", &c->data[PROP_OS_HOME_URL]);
 163         if (r < 0 && r != -ENOENT)
 164                 log_warning_errno(r, "Failed to read os-release file, ignoring: %m");
 165
 166         c->etc_os_release_stat = current_stat;
 167 }
 168
 169 static const char* valid_chassis(const char *chassis) {
 170         assert(chassis);
 171
 172         return nulstr_get(
 173                         "vm\0"
 174                         "container\0"
 175                         "desktop\0"
 176                         "laptop\0"
 177                         "convertible\0"
 178                         "server\0"
 179                         "tablet\0"
 180                         "handset\0"
 181                         "watch\0"
 182                         "embedded\0",
 183                         chassis);
 184 }
 185
 186 static bool valid_deployment(const char *deployment) {
 187         assert(deployment);
 188
 189         return in_charset(deployment, VALID_DEPLOYMENT_CHARS);
 190 }
 191
 192 static const char* fallback_chassis(void) {
 193         const char *chassis;
 194         _cleanup_free_ char *type = NULL;
 195         unsigned t;
 196         int v, r;
 197
 198         v = detect_virtualization();
 199         if (v < 0)
 200                 log_debug_errno(v, "Failed to detect virtualization, ignoring: %m");
 201         else if (VIRTUALIZATION_IS_VM(v))
 202                 return "vm";
 203         else if (VIRTUALIZATION_IS_CONTAINER(v))
 204                 return "container";
 205
 206         r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
 207         if (r < 0) {
 208                 log_debug_errno(r, "Failed to read DMI chassis type, ignoring: %m");
 209                 goto try_acpi;
 210         }
 211
 212         r = safe_atou(type, &t);
 213         if (r < 0) {
 214                 log_debug_errno(r, "Failed to parse DMI chassis type \"%s\", ignoring: %m", type);
 215                 goto try_acpi;
 216         }
 217
 218         /* We only list the really obvious cases here. The DMI data is unreliable enough, so let's not do any
 219          * additional guesswork on top of that.
 220          *
 221          * See the SMBIOS Specification 3.0 section 7.4.1 for details about the values listed here:
 222          *
 223          * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.0.0.pdf
 224          */
 225
 226         switch (t) {
 227
 228         case 0x3: /* Desktop */
 229         case 0x4: /* Low Profile Desktop */
 230         case 0x6: /* Mini Tower */
 231         case 0x7: /* Tower */
 232         case 0xD: /* All in one (i.e. PC built into monitor) */
 233                 return "desktop";
 234
 235         case 0x8: /* Portable */
 236         case 0x9: /* Laptop */
 237         case 0xA: /* Notebook */
 238         case 0xE: /* Sub Notebook */
 239                 return "laptop";
 240
 241         case 0xB: /* Hand Held */
 242                 return "handset";
 243
 244         case 0x11: /* Main Server Chassis */
 245         case 0x1C: /* Blade */
 246         case 0x1D: /* Blade Enclosure */
 247                 return "server";
 248
 249         case 0x1E: /* Tablet */
 250                 return "tablet";
 251
 252         case 0x1F: /* Convertible */
 253         case 0x20: /* Detachable */
 254                 return "convertible";
 255
 256         default:
 257                 log_debug("Unhandled DMI chassis type 0x%02x, ignoring.", t);
 258         }
 259
 260 try_acpi:
 261         type = mfree(type);
 262         r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);
 263         if (r < 0) {
 264                 log_debug_errno(r, "Failed read ACPI PM profile, ignoring: %m");
 265                 goto try_devicetree;
 266         }
 267
 268         r = safe_atou(type, &t);
 269         if (r < 0) {
 270                 log_debug_errno(r, "Failed parse ACPI PM profile \"%s\", ignoring: %m", type);
 271                 goto try_devicetree;
 272         }
 273
 274         /* We only list the really obvious cases here as the ACPI data is not really super reliable.
 275          *
 276          * See the ACPI 5.0 Spec Section 5.2.9.1 for details:
 277          *
 278          * http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
 279          */
 280
 281         switch(t) {
 282
 283         case 1: /* Desktop */
 284         case 3: /* Workstation */
 285         case 6: /* Appliance PC */
 286                 return "desktop";
 287
 288         case 2: /* Mobile */
 289                 return "laptop";
 290
 291         case 4: /* Enterprise Server */
 292         case 5: /* SOHO Server */
 293         case 7: /* Performance Server */
 294                 return "server";
 295
 296         case 8: /* Tablet */
 297                 return "tablet";
 298
 299         default:
 300                 log_debug("Unhandled ACPI PM profile 0x%02x, ignoring.", t);
 301         }
 302
 303 try_devicetree:
 304         type = mfree(type);
 305         r = read_one_line_file("/proc/device-tree/chassis-type", &type);
 306         if (r < 0) {
 307                 log_debug_errno(r, "Failed to read device-tree chassis type, ignoring: %m");
 308                 return NULL;
 309         }
 310
 311         /* Note that the Devicetree specification uses the very same vocabulary
 312          * of chassis types as we do, hence we do not need to translate these types:
 313          *
 314          * https://github.com/devicetree-org/devicetree-specification/blob/master/source/chapter3-devicenodes.rst */
 315         chassis = valid_chassis(type);
 316         if (!chassis)
 317                 log_debug("Invalid device-tree chassis type \"%s\", ignoring.", type);
 318         return chassis;
 319 }
 320
 321 static char* context_fallback_icon_name(Context *c) {
 322         const char *chassis;
 323
 324         assert(c);
 325
 326         if (!isempty(c->data[PROP_CHASSIS]))
 327                 return strjoin("computer-", c->data[PROP_CHASSIS]);
 328
 329         chassis = fallback_chassis();
 330         if (chassis)
 331                 return strjoin("computer-", chassis);
 332
 333         return strdup("computer");
 334 }
 335
 336 static int context_update_kernel_hostname(
 337                 Context *c,
 338                 const char *transient_hn) {
 339
 340         _cleanup_free_ char *_hn_free = NULL;
 341         const char *hn;
 342         HostnameSource hns;
 343         int r;
 344
 345         assert(c);
 346
 347         /* /etc/hostname has the highest preference ... */
 348         if (c->data[PROP_STATIC_HOSTNAME]) {
 349                 hn = c->data[PROP_STATIC_HOSTNAME];
 350                 hns = HOSTNAME_STATIC;
 351
 352         /* ... the transient hostname, (ie: DHCP) comes next ... */
 353         } else if (transient_hn) {
 354                 hn = transient_hn;
 355                 hns = HOSTNAME_TRANSIENT;
 356
 357         /* ... and the ultimate fallback */
 358         } else {
 359                 hn = _hn_free = get_default_hostname();
 360                 if (!hn)
 361                         return log_oom();
 362
 363                 hns = HOSTNAME_DEFAULT;
 364         }
 365
 366         r = sethostname_idempotent(hn);
 367         if (r < 0)
 368                 return log_error_errno(r, "Failed to set hostname: %m");
 369
 370         if (c->hostname_source != hns) {
 371                 c->hostname_source = hns;
 372                 r = 1;
 373         }
 374
 375         (void) nscd_flush_cache(STRV_MAKE("hosts"));
 376
 377         if (r == 0)
 378                 log_debug("Hostname was already set to <%s>.", hn);
 379         else {
 380                 log_info("Hostname set to <%s> (%s)", hn, hostname_source_to_string(hns));
 381
 382                 hostname_update_source_hint(hn, hns);
 383         }
 384
 385         return r; /* 0 if no change, 1 if something was done  */
 386 }
 387
 388 static void unset_statp(struct stat **p) {
 389         if (!*p)
 390                 return;
 391
 392         **p = (struct stat) {};
 393 }
 394
 395 static int context_write_data_static_hostname(Context *c) {
 396         _cleanup_(unset_statp) struct stat *s = NULL;
 397         int r;
 398
 399         assert(c);
 400
 401         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 402          * already, even if we can't make it hit the disk. */
 403         s = &c->etc_hostname_stat;
 404
 405         if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
 406                 if (unlink("/etc/hostname") < 0 && errno != ENOENT)
 407                         return -errno;
 408
 409                 TAKE_PTR(s);
 410                 return 0;
 411         }
 412
 413         r = write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
 414         if (r < 0)
 415                 return r;
 416
 417         TAKE_PTR(s);
 418         return 0;
 419 }
 420
 421 static int context_write_data_machine_info(Context *c) {
 422         _cleanup_(unset_statp) struct stat *s = NULL;
 423         static const char * const name[_PROP_MAX] = {
 424                 [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
 425                 [PROP_ICON_NAME] = "ICON_NAME",
 426                 [PROP_CHASSIS] = "CHASSIS",
 427                 [PROP_DEPLOYMENT] = "DEPLOYMENT",
 428                 [PROP_LOCATION] = "LOCATION",
 429         };
 430         _cleanup_strv_free_ char **l = NULL;
 431         int r;
 432
 433         assert(c);
 434
 435         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 436          * already, even if we can't make it hit the disk. */
 437         s = &c->etc_machine_info_stat;
 438
 439         r = load_env_file(NULL, "/etc/machine-info", &l);
 440         if (r < 0 && r != -ENOENT)
 441                 return r;
 442
 443         for (int p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
 444                 assert(name[p]);
 445
 446                 r = strv_env_assign(&l, name[p], empty_to_null(c->data[p]));
 447                 if (r < 0)
 448                         return r;
 449         }
 450
 451         if (strv_isempty(l)) {
 452                 if (unlink("/etc/machine-info") < 0 && errno != ENOENT)
 453                         return -errno;
 454
 455                 TAKE_PTR(s);
 456                 return 0;
 457         }
 458
 459         r = write_env_file_label("/etc/machine-info", l);
 460         if (r < 0)
 461                 return r;
 462
 463         TAKE_PTR(s);
 464         return 0;
 465 }
 466
 467 static int get_dmi_data(const char *database_key, const char *regular_key, char **ret) {
 468         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 469         _cleanup_free_ char *b = NULL;
 470         const char *s = NULL;
 471         int r;
 472
 473         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
 474         if (r < 0)
 475                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
 476
 477         if (database_key)
 478                 (void) sd_device_get_property_value(device, database_key, &s);
 479         if (!s && regular_key)
 480                 (void) sd_device_get_property_value(device, regular_key, &s);
 481
 482         if (s) {
 483                 b = strdup(s);
 484                 if (!b)
 485                         return -ENOMEM;
 486         }
 487
 488         if (ret)
 489                 *ret = TAKE_PTR(b);
 490
 491         return !!s;
 492 }
 493
 494 static int get_hardware_vendor(char **ret) {
 495         return get_dmi_data("ID_VENDOR_FROM_DATABASE", "ID_VENDOR", ret);
 496 }
 497
 498 static int get_hardware_model(char **ret) {
 499         return get_dmi_data("ID_MODEL_FROM_DATABASE", "ID_MODEL", ret);
 500 }
 501
 502 static int property_get_hardware_vendor(
 503                 sd_bus *bus,
 504                 const char *path,
 505                 const char *interface,
 506                 const char *property,
 507                 sd_bus_message *reply,
 508                 void *userdata,
 509                 sd_bus_error *error) {
 510
 511         _cleanup_free_ char *vendor = NULL;
 512
 513         (void) get_hardware_vendor(&vendor);
 514         return sd_bus_message_append(reply, "s", vendor);
 515 }
 516
 517 static int property_get_hardware_model(
 518                 sd_bus *bus,
 519                 const char *path,
 520                 const char *interface,
 521                 const char *property,
 522                 sd_bus_message *reply,
 523                 void *userdata,
 524                 sd_bus_error *error) {
 525
 526         _cleanup_free_ char *model = NULL;
 527
 528         (void) get_hardware_model(&model);
 529         return sd_bus_message_append(reply, "s", model);
 530 }
 531
 532 static int property_get_hostname(
 533                 sd_bus *bus,
 534                 const char *path,
 535                 const char *interface,
 536                 const char *property,
 537                 sd_bus_message *reply,
 538                 void *userdata,
 539                 sd_bus_error *error) {
 540
 541         _cleanup_free_ char *hn = NULL;
 542         int r;
 543
 544         r = gethostname_strict(&hn);
 545         if (r < 0) {
 546                 if (r != -ENXIO)
 547                         return r;
 548
 549                 hn = get_default_hostname();
 550                 if (!hn)
 551                         return -ENOMEM;
 552         }
 553
 554         return sd_bus_message_append(reply, "s", hn);
 555 }
 556
 557 static int property_get_static_hostname(
 558                 sd_bus *bus,
 559                 const char *path,
 560                 const char *interface,
 561                 const char *property,
 562                 sd_bus_message *reply,
 563                 void *userdata,
 564                 sd_bus_error *error) {
 565
 566         Context *c = userdata;
 567         assert(c);
 568
 569         context_read_etc_hostname(c);
 570
 571         return sd_bus_message_append(reply, "s", c->data[PROP_STATIC_HOSTNAME]);
 572 }
 573
 574 static int property_get_default_hostname(
 575                 sd_bus *bus,
 576                 const char *path,
 577                 const char *interface,
 578                 const char *property,
 579                 sd_bus_message *reply,
 580                 void *userdata,
 581                 sd_bus_error *error) {
 582
 583         _cleanup_free_ char *hn = NULL;
 584
 585         hn = get_default_hostname();
 586         if (!hn)
 587                 return log_oom();
 588
 589         return sd_bus_message_append(reply, "s", hn);
 590 }
 591
 592 static void context_determine_hostname_source(Context *c) {
 593         _cleanup_free_ char *hostname = NULL;
 594         int r;
 595
 596         assert(c);
 597
 598         if (c->hostname_source >= 0)
 599                 return;
 600
 601         (void) gethostname_full(GET_HOSTNAME_ALLOW_LOCALHOST, &hostname);
 602
 603         if (streq_ptr(hostname, c->data[PROP_STATIC_HOSTNAME]))
 604                 c->hostname_source = HOSTNAME_STATIC;
 605         else {
 606                 _cleanup_free_ char *fallback = NULL;
 607
 608                 /* If the hostname was not set by us, try to figure out where it came from. If we set it to
 609                  * the default hostname, the file will tell us. We compare the string because it is possible
 610                  * that the hostname was set by an older version that had a different fallback, in the
 611                  * initramfs or before we reexecuted. */
 612
 613                 r = read_one_line_file("/run/systemd/default-hostname", &fallback);
 614                 if (r < 0 && r != -ENOENT)
 615                         log_warning_errno(r, "Failed to read /run/systemd/default-hostname, ignoring: %m");
 616
 617                 if (streq_ptr(fallback, hostname))
 618                         c->hostname_source = HOSTNAME_DEFAULT;
 619                 else
 620                         c->hostname_source = HOSTNAME_TRANSIENT;
 621         }
 622 }
 623
 624 static int property_get_hostname_source(
 625                 sd_bus *bus,
 626                 const char *path,
 627                 const char *interface,
 628                 const char *property,
 629                 sd_bus_message *reply,
 630                 void *userdata,
 631                 sd_bus_error *error) {
 632
 633         Context *c = userdata;
 634         assert(c);
 635
 636         context_read_etc_hostname(c);
 637         context_determine_hostname_source(c);
 638
 639         return sd_bus_message_append(reply, "s", hostname_source_to_string(c->hostname_source));
 640 }
 641
 642 static int property_get_machine_info_field(
 643                 sd_bus *bus,
 644                 const char *path,
 645                 const char *interface,
 646                 const char *property,
 647                 sd_bus_message *reply,
 648                 void *userdata,
 649                 sd_bus_error *error) {
 650
 651         sd_bus_slot *slot;
 652         Context *c;
 653
 654         /* Acquire the context object without this property's userdata offset added. Explanation: we want
 655          * access to two pointers here: a) the main context object we cache all properties in, and b) the
 656          * pointer to the property field inside the context object that we are supposed to update and
 657          * use. The latter (b) we get in the 'userdata' function parameter, and sd-bus calculates that for us
 658          * from the 'userdata' pointer we supplied when the vtable was registered, with the offset we
 659          * specified in the vtable added on top. To get the former (a) we need the 'userdata' pointer from
 660          * the vtable registration directly, without the offset added. Hence we ask sd-bus what the slot
 661          * object is (which encapsulates the vtable registration), and then query the 'userdata' field
 662          * directly off it. */
 663         assert_se(slot = sd_bus_get_current_slot(bus));
 664         assert_se(c = sd_bus_slot_get_userdata(slot));
 665
 666         context_read_machine_info(c);
 667
 668         return sd_bus_message_append(reply, "s", *(char**) userdata);
 669 }
 670
 671 static int property_get_os_release_field(
 672                 sd_bus *bus,
 673                 const char *path,
 674                 const char *interface,
 675                 const char *property,
 676                 sd_bus_message *reply,
 677                 void *userdata,
 678                 sd_bus_error *error) {
 679
 680         sd_bus_slot *slot;
 681         Context *c;
 682
 683         /* As above, acquire the current context without this property's userdata offset added. */
 684         assert_se(slot = sd_bus_get_current_slot(bus));
 685         assert_se(c = sd_bus_slot_get_userdata(slot));
 686
 687         context_read_os_release(c);
 688
 689         return sd_bus_message_append(reply, "s", *(char**) userdata);
 690 }
 691
 692 static int property_get_icon_name(
 693                 sd_bus *bus,
 694                 const char *path,
 695                 const char *interface,
 696                 const char *property,
 697                 sd_bus_message *reply,
 698                 void *userdata,
 699                 sd_bus_error *error) {
 700
 701         _cleanup_free_ char *n = NULL;
 702         Context *c = userdata;
 703         const char *name;
 704
 705         context_read_machine_info(c);
 706
 707         if (isempty(c->data[PROP_ICON_NAME]))
 708                 name = n = context_fallback_icon_name(c);
 709         else
 710                 name = c->data[PROP_ICON_NAME];
 711
 712         if (!name)
 713                 return -ENOMEM;
 714
 715         return sd_bus_message_append(reply, "s", name);
 716 }
 717
 718 static int property_get_chassis(
 719                 sd_bus *bus,
 720                 const char *path,
 721                 const char *interface,
 722                 const char *property,
 723                 sd_bus_message *reply,
 724                 void *userdata,
 725                 sd_bus_error *error) {
 726
 727         Context *c = userdata;
 728         const char *name;
 729
 730         context_read_machine_info(c);
 731
 732         if (isempty(c->data[PROP_CHASSIS]))
 733                 name = fallback_chassis();
 734         else
 735                 name = c->data[PROP_CHASSIS];
 736
 737         return sd_bus_message_append(reply, "s", name);
 738 }
 739
 740 static int property_get_uname_field(
 741                 sd_bus *bus,
 742                 const char *path,
 743                 const char *interface,
 744                 const char *property,
 745                 sd_bus_message *reply,
 746                 void *userdata,
 747                 sd_bus_error *error) {
 748
 749         struct utsname u;
 750
 751         assert_se(uname(&u) >= 0);
 752
 753         return sd_bus_message_append(reply, "s", (char*) &u + PTR_TO_SIZE(userdata));
 754 }
 755
 756 static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 757         Context *c = userdata;
 758         const char *name;
 759         int interactive, r;
 760
 761         assert(m);
 762         assert(c);
 763
 764         r = sd_bus_message_read(m, "sb", &name, &interactive);
 765         if (r < 0)
 766                 return r;
 767
 768         name = empty_to_null(name);
 769
 770         /* We always go through with the procedure below without comparing to the current hostname, because
 771          * we might want to adjust hostname source information even if the actual hostname is unchanged. */
 772
 773         if (name && !hostname_is_valid(name, 0))
 774                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
 775
 776         context_read_etc_hostname(c);
 777
 778         r = bus_verify_polkit_async(
 779                         m,
 780                         CAP_SYS_ADMIN,
 781                         "org.freedesktop.hostname1.set-hostname",
 782                         NULL,
 783                         interactive,
 784                         UID_INVALID,
 785                         &c->polkit_registry,
 786                         error);
 787         if (r < 0)
 788                 return r;
 789         if (r == 0)
 790                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 791
 792         r = context_update_kernel_hostname(c, name);
 793         if (r < 0)
 794                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 795         else if (r > 0)
 796                 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 797                                                       "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 798                                                       "Hostname", "HostnameSource", NULL);
 799
 800         return sd_bus_reply_method_return(m, NULL);
 801 }
 802
 803 static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 804         Context *c = userdata;
 805         const char *name;
 806         int interactive;
 807         int r;
 808
 809         assert(m);
 810         assert(c);
 811
 812         r = sd_bus_message_read(m, "sb", &name, &interactive);
 813         if (r < 0)
 814                 return r;
 815
 816         name = empty_to_null(name);
 817
 818         context_read_etc_hostname(c);
 819
 820         if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
 821                 return sd_bus_reply_method_return(m, NULL);
 822
 823         if (name && !hostname_is_valid(name, 0))
 824                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
 825
 826         r = bus_verify_polkit_async(
 827                         m,
 828                         CAP_SYS_ADMIN,
 829                         "org.freedesktop.hostname1.set-static-hostname",
 830                         NULL,
 831                         interactive,
 832                         UID_INVALID,
 833                         &c->polkit_registry,
 834                         error);
 835         if (r < 0)
 836                 return r;
 837         if (r == 0)
 838                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 839
 840         r = free_and_strdup_warn(&c->data[PROP_STATIC_HOSTNAME], name);
 841         if (r < 0)
 842                 return r;
 843
 844         r = context_write_data_static_hostname(c);
 845         if (r < 0) {
 846                 log_error_errno(r, "Failed to write static hostname: %m");
 847                 if (ERRNO_IS_PRIVILEGE(r))
 848                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/hostname.");
 849                 if (r == -EROFS)
 850                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/hostname is in a read-only filesystem.");
 851                 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %m");
 852         }
 853
 854         r = context_update_kernel_hostname(c, NULL);
 855         if (r < 0) {
 856                 log_error_errno(r, "Failed to set hostname: %m");
 857                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 858         }
 859
 860         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 861                                               "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 862                                               "StaticHostname", "Hostname", "HostnameSource", NULL);
 863
 864         return sd_bus_reply_method_return(m, NULL);
 865 }
 866
 867 static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
 868         int interactive;
 869         const char *name;
 870         int r;
 871
 872         assert(c);
 873         assert(m);
 874
 875         r = sd_bus_message_read(m, "sb", &name, &interactive);
 876         if (r < 0)
 877                 return r;
 878
 879         name = empty_to_null(name);
 880
 881         context_read_machine_info(c);
 882
 883         if (streq_ptr(name, c->data[prop]))
 884                 return sd_bus_reply_method_return(m, NULL);
 885
 886         if (!isempty(name)) {
 887                 /* The icon name might ultimately be used as file
 888                  * name, so better be safe than sorry */
 889
 890                 if (prop == PROP_ICON_NAME && !filename_is_valid(name))
 891                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
 892                 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
 893                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty hostname '%s'", name);
 894                 if (prop == PROP_CHASSIS && !valid_chassis(name))
 895                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
 896                 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
 897                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
 898                 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
 899                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
 900         }
 901
 902         /* Since the pretty hostname should always be changed at the
 903          * same time as the static one, use the same policy action for
 904          * both... */
 905
 906         r = bus_verify_polkit_async(
 907                         m,
 908                         CAP_SYS_ADMIN,
 909                         prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
 910                         NULL,
 911                         interactive,
 912                         UID_INVALID,
 913                         &c->polkit_registry,
 914                         error);
 915         if (r < 0)
 916                 return r;
 917         if (r == 0)
 918                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 919
 920         r = free_and_strdup_warn(&c->data[prop], name);
 921         if (r < 0)
 922                 return r;
 923
 924         r = context_write_data_machine_info(c);
 925         if (r < 0) {
 926                 log_error_errno(r, "Failed to write machine info: %m");
 927                 if (ERRNO_IS_PRIVILEGE(r))
 928                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/machine-info.");
 929                 if (r == -EROFS)
 930                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/machine-info is in a read-only filesystem.");
 931                 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %m");
 932         }
 933
 934         log_info("Changed %s to '%s'",
 935                  prop == PROP_PRETTY_HOSTNAME ? "pretty hostname" :
 936                  prop == PROP_DEPLOYMENT ? "deployment" :
 937                  prop == PROP_LOCATION ? "location" :
 938                  prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
 939
 940         (void) sd_bus_emit_properties_changed(
 941                         sd_bus_message_get_bus(m),
 942                         "/org/freedesktop/hostname1",
 943                         "org.freedesktop.hostname1",
 944                         prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
 945                         prop == PROP_DEPLOYMENT ? "Deployment" :
 946                         prop == PROP_LOCATION ? "Location" :
 947                         prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
 948
 949         return sd_bus_reply_method_return(m, NULL);
 950 }
 951
 952 static int method_set_pretty_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 953         return set_machine_info(userdata, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
 954 }
 955
 956 static int method_set_icon_name(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 957         return set_machine_info(userdata, m, PROP_ICON_NAME, method_set_icon_name, error);
 958 }
 959
 960 static int method_set_chassis(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 961         return set_machine_info(userdata, m, PROP_CHASSIS, method_set_chassis, error);
 962 }
 963
 964 static int method_set_deployment(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 965         return set_machine_info(userdata, m, PROP_DEPLOYMENT, method_set_deployment, error);
 966 }
 967
 968 static int method_set_location(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 969         return set_machine_info(userdata, m, PROP_LOCATION, method_set_location, error);
 970 }
 971
 972 static int method_get_product_uuid(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 973         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
 974         Context *c = userdata;
 975         int interactive, r;
 976         sd_id128_t uuid;
 977
 978         assert(m);
 979         assert(c);
 980
 981         r = sd_bus_message_read(m, "b", &interactive);
 982         if (r < 0)
 983                 return r;
 984
 985         r = bus_verify_polkit_async(
 986                         m,
 987                         CAP_SYS_ADMIN,
 988                         "org.freedesktop.hostname1.get-product-uuid",
 989                         NULL,
 990                         interactive,
 991                         UID_INVALID,
 992                         &c->polkit_registry,
 993                         error);
 994         if (r < 0)
 995                 return r;
 996         if (r == 0)
 997                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 998
 999         r = id128_get_product(&uuid);
1000         if (r < 0) {
1001                 if (r == -EADDRNOTAVAIL)
1002                         log_debug_errno(r, "DMI product UUID is all 0x00 or all 0xFF, ignoring.");
1003                 else
1004                         log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
1005                                        "Failed to read product UUID, ignoring: %m");
1006
1007                 return sd_bus_error_set(error, BUS_ERROR_NO_PRODUCT_UUID,
1008                                         "Failed to read product UUID from firmware.");
1009         }
1010
1011         r = sd_bus_message_new_method_return(m, &reply);
1012         if (r < 0)
1013                 return r;
1014
1015         r = sd_bus_message_append_array(reply, 'y', uuid.bytes, sizeof(uuid.bytes));
1016         if (r < 0)
1017                 return r;
1018
1019         return sd_bus_send(NULL, reply, NULL);
1020 }
1021
1022 static int method_describe(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1023         _cleanup_free_ char *hn = NULL, *dhn = NULL, *in = NULL, *text = NULL, *vendor = NULL, *model = NULL;
1024         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1025         _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
1026         sd_id128_t product_uuid = SD_ID128_NULL;
1027         const char *chassis = NULL;
1028         Context *c = userdata;
1029         bool privileged;
1030         struct utsname u;
1031         int r;
1032
1033         assert(m);
1034         assert(c);
1035
1036         r = bus_verify_polkit_async(
1037                         m,
1038                         CAP_SYS_ADMIN,
1039                         "org.freedesktop.hostname1.get-product-uuid",
1040                         NULL,
1041                         false,
1042                         UID_INVALID,
1043                         &c->polkit_registry,
1044                         NULL);
1045         if (r == 0)
1046                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1047
1048         /* We ignore all authentication errors here, since most data is unprivileged, the one exception being
1049          * the product ID which we'll check explicitly. */
1050         privileged = r > 0;
1051
1052         context_read_etc_hostname(c);
1053         context_read_machine_info(c);
1054         context_read_os_release(c);
1055         context_determine_hostname_source(c);
1056
1057         r = gethostname_strict(&hn);
1058         if (r < 0) {
1059                 if (r != -ENXIO)
1060                         return log_error_errno(r, "Failed to read local host name: %m");
1061
1062                 hn = get_default_hostname();
1063                 if (!hn)
1064                         return log_oom();
1065         }
1066
1067         dhn = get_default_hostname();
1068         if (!dhn)
1069                 return log_oom();
1070
1071         if (isempty(c->data[PROP_ICON_NAME]))
1072                 in = context_fallback_icon_name(c);
1073
1074         if (isempty(c->data[PROP_CHASSIS]))
1075                 chassis = fallback_chassis();
1076
1077         assert_se(uname(&u) >= 0);
1078
1079         (void) get_hardware_vendor(&vendor);
1080         (void) get_hardware_model(&model);
1081
1082         if (privileged) /* The product UUID is only available to privileged clients */
1083                 id128_get_product(&product_uuid);
1084
1085         r = json_build(&v, JSON_BUILD_OBJECT(
1086                                        JSON_BUILD_PAIR("Hostname", JSON_BUILD_STRING(hn)),
1087                                        JSON_BUILD_PAIR("StaticHostname", JSON_BUILD_STRING(c->data[PROP_STATIC_HOSTNAME])),
1088                                        JSON_BUILD_PAIR("PrettyHostname", JSON_BUILD_STRING(c->data[PROP_PRETTY_HOSTNAME])),
1089                                        JSON_BUILD_PAIR("DefaultHostname", JSON_BUILD_STRING(dhn)),
1090                                        JSON_BUILD_PAIR("HostnameSource", JSON_BUILD_STRING(hostname_source_to_string(c->hostname_source))),
1091                                        JSON_BUILD_PAIR("IconName", JSON_BUILD_STRING(in ?: c->data[PROP_ICON_NAME])),
1092                                        JSON_BUILD_PAIR("Chassis", JSON_BUILD_STRING(chassis ?: c->data[PROP_CHASSIS])),
1093                                        JSON_BUILD_PAIR("Deployment", JSON_BUILD_STRING(c->data[PROP_DEPLOYMENT])),
1094                                        JSON_BUILD_PAIR("Location", JSON_BUILD_STRING(c->data[PROP_LOCATION])),
1095                                        JSON_BUILD_PAIR("KernelName", JSON_BUILD_STRING(u.sysname)),
1096                                        JSON_BUILD_PAIR("KernelRelease", JSON_BUILD_STRING(u.release)),
1097                                        JSON_BUILD_PAIR("KernelVersion", JSON_BUILD_STRING(u.version)),
1098                                        JSON_BUILD_PAIR("OperatingSystemPrettyName", JSON_BUILD_STRING(c->data[PROP_OS_PRETTY_NAME])),
1099                                        JSON_BUILD_PAIR("OperatingSystemCPEName", JSON_BUILD_STRING(c->data[PROP_OS_CPE_NAME])),
1100                                        JSON_BUILD_PAIR("OperatingSystemHomeURL", JSON_BUILD_STRING(c->data[PROP_OS_HOME_URL])),
1101                                        JSON_BUILD_PAIR("HardwareVendor", JSON_BUILD_STRING(vendor)),
1102                                        JSON_BUILD_PAIR("HardwareModel", JSON_BUILD_STRING(model)),
1103                                        JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_ID128(product_uuid)),
1104                                        JSON_BUILD_PAIR_CONDITION(sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_NULL)));
1105
1106         if (r < 0)
1107                 return log_error_errno(r, "Failed to build JSON data: %m");
1108
1109         r = json_variant_format(v, 0, &text);
1110         if (r < 0)
1111                 return log_error_errno(r, "Failed to format JSON data: %m");
1112
1113         r = sd_bus_message_new_method_return(m, &reply);
1114         if (r < 0)
1115                 return r;
1116
1117         r = sd_bus_message_append(reply, "s", text);
1118         if (r < 0)
1119                 return r;
1120
1121         return sd_bus_send(NULL, reply, NULL);
1122 }
1123
1124 static const sd_bus_vtable hostname_vtable[] = {
1125         SD_BUS_VTABLE_START(0),
1126         SD_BUS_PROPERTY("Hostname", "s", property_get_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1127         SD_BUS_PROPERTY("StaticHostname", "s", property_get_static_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1128         SD_BUS_PROPERTY("PrettyHostname", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1129         SD_BUS_PROPERTY("DefaultHostname", "s", property_get_default_hostname, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1130         SD_BUS_PROPERTY("HostnameSource", "s", property_get_hostname_source, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1131         SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1132         SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1133         SD_BUS_PROPERTY("Deployment", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1134         SD_BUS_PROPERTY("Location", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1135         SD_BUS_PROPERTY("KernelName", "s", property_get_uname_field, offsetof(struct utsname, sysname), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1136         SD_BUS_PROPERTY("KernelRelease", "s", property_get_uname_field, offsetof(struct utsname, release), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1137         SD_BUS_PROPERTY("KernelVersion", "s", property_get_uname_field, offsetof(struct utsname, version), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1138         SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1139         SD_BUS_PROPERTY("OperatingSystemCPEName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1140         SD_BUS_PROPERTY("HomeURL", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_HOME_URL, SD_BUS_VTABLE_PROPERTY_CONST),
1141         SD_BUS_PROPERTY("HardwareVendor", "s", property_get_hardware_vendor, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1142         SD_BUS_PROPERTY("HardwareModel", "s", property_get_hardware_model, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1143
1144         SD_BUS_METHOD_WITH_NAMES("SetHostname",
1145                                  "sb",
1146                                  SD_BUS_PARAM(hostname)
1147                                  SD_BUS_PARAM(interactive),
1148                                  NULL,,
1149                                  method_set_hostname,
1150                                  SD_BUS_VTABLE_UNPRIVILEGED),
1151         SD_BUS_METHOD_WITH_NAMES("SetStaticHostname",
1152                                  "sb",
1153                                  SD_BUS_PARAM(hostname)
1154                                  SD_BUS_PARAM(interactive),
1155                                  NULL,,
1156                                  method_set_static_hostname,
1157                                  SD_BUS_VTABLE_UNPRIVILEGED),
1158         SD_BUS_METHOD_WITH_NAMES("SetPrettyHostname",
1159                                  "sb",
1160                                  SD_BUS_PARAM(hostname)
1161                                  SD_BUS_PARAM(interactive),
1162                                  NULL,,
1163                                  method_set_pretty_hostname,
1164                                  SD_BUS_VTABLE_UNPRIVILEGED),
1165         SD_BUS_METHOD_WITH_NAMES("SetIconName",
1166                                  "sb",
1167                                  SD_BUS_PARAM(icon)
1168                                  SD_BUS_PARAM(interactive),
1169                                  NULL,,
1170                                  method_set_icon_name,
1171                                  SD_BUS_VTABLE_UNPRIVILEGED),
1172         SD_BUS_METHOD_WITH_NAMES("SetChassis",
1173                                  "sb",
1174                                  SD_BUS_PARAM(chassis)
1175                                  SD_BUS_PARAM(interactive),
1176                                  NULL,,
1177                                  method_set_chassis,
1178                                  SD_BUS_VTABLE_UNPRIVILEGED),
1179         SD_BUS_METHOD_WITH_NAMES("SetDeployment",
1180                                  "sb",
1181                                  SD_BUS_PARAM(deployment)
1182                                  SD_BUS_PARAM(interactive),
1183                                  NULL,,
1184                                  method_set_deployment,
1185                                  SD_BUS_VTABLE_UNPRIVILEGED),
1186         SD_BUS_METHOD_WITH_NAMES("SetLocation",
1187                                  "sb",
1188                                  SD_BUS_PARAM(location)
1189                                  SD_BUS_PARAM(interactive),
1190                                  NULL,,
1191                                  method_set_location,
1192                                  SD_BUS_VTABLE_UNPRIVILEGED),
1193         SD_BUS_METHOD_WITH_NAMES("GetProductUUID",
1194                                  "b",
1195                                  SD_BUS_PARAM(interactive),
1196                                  "ay",
1197                                  SD_BUS_PARAM(uuid),
1198                                  method_get_product_uuid,
1199                                  SD_BUS_VTABLE_UNPRIVILEGED),
1200         SD_BUS_METHOD_WITH_ARGS("Describe",
1201                                 SD_BUS_NO_ARGS,
1202                                 SD_BUS_RESULT("s", json),
1203                                 method_describe,
1204                                 SD_BUS_VTABLE_UNPRIVILEGED),
1205
1206         SD_BUS_VTABLE_END,
1207 };
1208
1209 static const BusObjectImplementation manager_object = {
1210         "/org/freedesktop/hostname1",
1211         "org.freedesktop.hostname1",
1212         .vtables = BUS_VTABLES(hostname_vtable),
1213 };
1214
1215 static int connect_bus(Context *c, sd_event *event, sd_bus **ret) {
1216         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1217         int r;
1218
1219         assert(c);
1220         assert(event);
1221         assert(ret);
1222
1223         r = sd_bus_default_system(&bus);
1224         if (r < 0)
1225                 return log_error_errno(r, "Failed to get system bus connection: %m");
1226
1227         r = bus_add_implementation(bus, &manager_object, c);
1228         if (r < 0)
1229                 return r;
1230
1231         r = bus_log_control_api_register(bus);
1232         if (r < 0)
1233                 return r;
1234
1235         r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.hostname1", 0, NULL, NULL);
1236         if (r < 0)
1237                 return log_error_errno(r, "Failed to request name: %m");
1238
1239         r = sd_bus_attach_event(bus, event, 0);
1240         if (r < 0)
1241                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
1242
1243         *ret = TAKE_PTR(bus);
1244         return 0;
1245 }
1246
1247 static int run(int argc, char *argv[]) {
1248         _cleanup_(context_destroy) Context context = {
1249                 .hostname_source = _HOSTNAME_INVALID, /* appropriate value will be set later */
1250         };
1251         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
1252         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1253         int r;
1254
1255         log_setup();
1256
1257         r = service_parse_argv("systemd-hostnamed.service",
1258                                "Manage the system hostname and related metadata.",
1259                                BUS_IMPLEMENTATIONS(&manager_object,
1260                                                    &log_control_object),
1261                                argc, argv);
1262         if (r <= 0)
1263                 return r;
1264
1265         umask(0022);
1266
1267         r = mac_selinux_init();
1268         if (r < 0)
1269                 return r;
1270
1271         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
1272
1273         r = sd_event_default(&event);
1274         if (r < 0)
1275                 return log_error_errno(r, "Failed to allocate event loop: %m");
1276
1277         (void) sd_event_set_watchdog(event, true);
1278
1279         r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
1280         if (r < 0)
1281                 return log_error_errno(r, "Failed to install SIGINT handler: %m");
1282
1283         r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
1284         if (r < 0)
1285                 return log_error_errno(r, "Failed to install SIGTERM handler: %m");
1286
1287         r = connect_bus(&context, event, &bus);
1288         if (r < 0)
1289                 return r;
1290
1291         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
1292         if (r < 0)
1293                 return log_error_errno(r, "Failed to run event loop: %m");
1294
1295         return 0;
1296 }
1297
1298 DEFINE_MAIN_FUNCTION(run);