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 typedef 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         PROP_VENDOR,
  57         PROP_MODEL,
  58
  59         /* Read from /etc/os-release (or /usr/lib/os-release) */
  60         PROP_OS_PRETTY_NAME,
  61         PROP_OS_CPE_NAME,
  62         PROP_OS_HOME_URL,
  63         _PROP_MAX,
  64         _PROP_INVALID = -EINVAL,
  65 } HostProperty;
  66
  67 typedef struct Context {
  68         char *data[_PROP_MAX];
  69
  70         HostnameSource hostname_source;
  71
  72         struct stat etc_hostname_stat;
  73         struct stat etc_os_release_stat;
  74         struct stat etc_machine_info_stat;
  75
  76         Hashmap *polkit_registry;
  77 } Context;
  78
  79 static void context_reset(Context *c, uint64_t mask) {
  80         assert(c);
  81
  82         for (int p = 0; p < _PROP_MAX; p++) {
  83                 if (!FLAGS_SET(mask, UINT64_C(1) << p))
  84                         continue;
  85
  86                 c->data[p] = mfree(c->data[p]);
  87         }
  88 }
  89
  90 static void context_destroy(Context *c) {
  91         assert(c);
  92
  93         context_reset(c, UINT64_MAX);
  94         bus_verify_polkit_async_registry_free(c->polkit_registry);
  95 }
  96
  97 static void context_read_etc_hostname(Context *c) {
  98         struct stat current_stat = {};
  99         int r;
 100
 101         assert(c);
 102
 103         if (stat("/etc/hostname", &current_stat) >= 0 &&
 104             stat_inode_unmodified(&c->etc_hostname_stat, &current_stat))
 105                 return;
 106
 107         context_reset(c, UINT64_C(1) << PROP_STATIC_HOSTNAME);
 108
 109         r = read_etc_hostname(NULL, &c->data[PROP_STATIC_HOSTNAME]);
 110         if (r < 0 && r != -ENOENT)
 111                 log_warning_errno(r, "Failed to read /etc/hostname, ignoring: %m");
 112
 113         c->etc_hostname_stat = current_stat;
 114 }
 115
 116 static void context_read_machine_info(Context *c) {
 117         struct stat current_stat = {};
 118         int r;
 119
 120         assert(c);
 121
 122         if (stat("/etc/machine-info", &current_stat) >= 0 &&
 123             stat_inode_unmodified(&c->etc_machine_info_stat, &current_stat))
 124                 return;
 125
 126         context_reset(c,
 127                       (UINT64_C(1) << PROP_PRETTY_HOSTNAME) |
 128                       (UINT64_C(1) << PROP_ICON_NAME) |
 129                       (UINT64_C(1) << PROP_CHASSIS) |
 130                       (UINT64_C(1) << PROP_DEPLOYMENT) |
 131                       (UINT64_C(1) << PROP_LOCATION));
 132
 133         r = parse_env_file(NULL, "/etc/machine-info",
 134                            "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
 135                            "ICON_NAME", &c->data[PROP_ICON_NAME],
 136                            "CHASSIS", &c->data[PROP_CHASSIS],
 137                            "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
 138                            "LOCATION", &c->data[PROP_LOCATION],
 139                            "VENDOR", &c->data[PROP_VENDOR],
 140                            "MODEL", &c->data[PROP_MODEL]);
 141         if (r < 0 && r != -ENOENT)
 142                 log_warning_errno(r, "Failed to read /etc/machine-info, ignoring: %m");
 143
 144         c->etc_machine_info_stat = current_stat;
 145 }
 146
 147 static void context_read_os_release(Context *c) {
 148         struct stat current_stat = {};
 149         int r;
 150
 151         assert(c);
 152
 153         if ((stat("/etc/os-release", &current_stat) >= 0 ||
 154              stat("/usr/lib/os-release", &current_stat) >= 0) &&
 155             stat_inode_unmodified(&c->etc_os_release_stat, &current_stat))
 156                 return;
 157
 158         context_reset(c,
 159                       (UINT64_C(1) << PROP_OS_PRETTY_NAME) |
 160                       (UINT64_C(1) << PROP_OS_CPE_NAME) |
 161                       (UINT64_C(1) << PROP_OS_HOME_URL));
 162
 163         r = parse_os_release(NULL,
 164                              "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
 165                              "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
 166                              "HOME_URL", &c->data[PROP_OS_HOME_URL]);
 167         if (r < 0 && r != -ENOENT)
 168                 log_warning_errno(r, "Failed to read os-release file, ignoring: %m");
 169
 170         c->etc_os_release_stat = current_stat;
 171 }
 172
 173 static int get_dmi_data(const char *database_key, const char *regular_key, char **ret) {
 174         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 175         _cleanup_free_ char *b = NULL;
 176         const char *s = NULL;
 177         int r;
 178
 179         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
 180         if (r < 0)
 181                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
 182
 183         if (database_key)
 184                 (void) sd_device_get_property_value(device, database_key, &s);
 185         if (!s && regular_key)
 186                 (void) sd_device_get_property_value(device, regular_key, &s);
 187
 188         if (!ret)
 189                 return !!s;
 190
 191         if (s) {
 192                 b = strdup(s);
 193                 if (!b)
 194                         return -ENOMEM;
 195         }
 196
 197         *ret = TAKE_PTR(b);
 198         return !!s;
 199 }
 200
 201 static int get_hardware_vendor(char **ret) {
 202         return get_dmi_data("ID_VENDOR_FROM_DATABASE", "ID_VENDOR", ret);
 203 }
 204
 205 static int get_hardware_model(char **ret) {
 206         return get_dmi_data("ID_MODEL_FROM_DATABASE", "ID_MODEL", ret);
 207 }
 208
 209 static int get_hardware_serial(char **ret) {
 210         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 211         _cleanup_free_ char *b = NULL;
 212         const char *s = NULL;
 213         int r;
 214
 215         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
 216         if (r < 0)
 217                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
 218
 219         (void) sd_device_get_sysattr_value(device, "product_serial", &s);
 220         if (isempty(s))
 221                 /* Fallback to board serial */
 222                 (void) sd_device_get_sysattr_value(device, "board_serial", &s);
 223
 224         if (!isempty(s)) {
 225                 b = strdup(s);
 226                 if (!b)
 227                         return -ENOMEM;
 228         }
 229
 230         if (ret)
 231                 *ret = TAKE_PTR(b);
 232
 233         return !isempty(s);
 234 }
 235
 236 static const char* valid_chassis(const char *chassis) {
 237         assert(chassis);
 238
 239         return nulstr_get(
 240                         "vm\0"
 241                         "container\0"
 242                         "desktop\0"
 243                         "laptop\0"
 244                         "convertible\0"
 245                         "server\0"
 246                         "tablet\0"
 247                         "handset\0"
 248                         "watch\0"
 249                         "embedded\0",
 250                         chassis);
 251 }
 252
 253 static bool valid_deployment(const char *deployment) {
 254         assert(deployment);
 255
 256         return in_charset(deployment, VALID_DEPLOYMENT_CHARS);
 257 }
 258
 259 static const char* fallback_chassis(void) {
 260         const char *chassis;
 261         _cleanup_free_ char *type = NULL;
 262         unsigned t;
 263         int v, r;
 264
 265         v = detect_virtualization();
 266         if (v < 0)
 267                 log_debug_errno(v, "Failed to detect virtualization, ignoring: %m");
 268         else if (VIRTUALIZATION_IS_VM(v))
 269                 return "vm";
 270         else if (VIRTUALIZATION_IS_CONTAINER(v))
 271                 return "container";
 272
 273         r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
 274         if (r < 0) {
 275                 log_debug_errno(r, "Failed to read DMI chassis type, ignoring: %m");
 276                 goto try_acpi;
 277         }
 278
 279         r = safe_atou(type, &t);
 280         if (r < 0) {
 281                 log_debug_errno(r, "Failed to parse DMI chassis type \"%s\", ignoring: %m", type);
 282                 goto try_acpi;
 283         }
 284
 285         /* We only list the really obvious cases here. The DMI data is unreliable enough, so let's not do any
 286          * additional guesswork on top of that.
 287          *
 288          * See the SMBIOS Specification 3.0 section 7.4.1 for details about the values listed here:
 289          *
 290          * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.0.0.pdf
 291          */
 292
 293         switch (t) {
 294
 295         case 0x3: /* Desktop */
 296         case 0x4: /* Low Profile Desktop */
 297         case 0x6: /* Mini Tower */
 298         case 0x7: /* Tower */
 299         case 0xD: /* All in one (i.e. PC built into monitor) */
 300                 return "desktop";
 301
 302         case 0x8: /* Portable */
 303         case 0x9: /* Laptop */
 304         case 0xA: /* Notebook */
 305         case 0xE: /* Sub Notebook */
 306                 return "laptop";
 307
 308         case 0xB: /* Hand Held */
 309                 return "handset";
 310
 311         case 0x11: /* Main Server Chassis */
 312         case 0x1C: /* Blade */
 313         case 0x1D: /* Blade Enclosure */
 314                 return "server";
 315
 316         case 0x1E: /* Tablet */
 317                 return "tablet";
 318
 319         case 0x1F: /* Convertible */
 320         case 0x20: /* Detachable */
 321                 return "convertible";
 322
 323         default:
 324                 log_debug("Unhandled DMI chassis type 0x%02x, ignoring.", t);
 325         }
 326
 327 try_acpi:
 328         type = mfree(type);
 329         r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);
 330         if (r < 0) {
 331                 log_debug_errno(r, "Failed read ACPI PM profile, ignoring: %m");
 332                 goto try_devicetree;
 333         }
 334
 335         r = safe_atou(type, &t);
 336         if (r < 0) {
 337                 log_debug_errno(r, "Failed parse ACPI PM profile \"%s\", ignoring: %m", type);
 338                 goto try_devicetree;
 339         }
 340
 341         /* We only list the really obvious cases here as the ACPI data is not really super reliable.
 342          *
 343          * See the ACPI 5.0 Spec Section 5.2.9.1 for details:
 344          *
 345          * http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
 346          */
 347
 348         switch(t) {
 349
 350         case 1: /* Desktop */
 351         case 3: /* Workstation */
 352         case 6: /* Appliance PC */
 353                 return "desktop";
 354
 355         case 2: /* Mobile */
 356                 return "laptop";
 357
 358         case 4: /* Enterprise Server */
 359         case 5: /* SOHO Server */
 360         case 7: /* Performance Server */
 361                 return "server";
 362
 363         case 8: /* Tablet */
 364                 return "tablet";
 365
 366         default:
 367                 log_debug("Unhandled ACPI PM profile 0x%02x, ignoring.", t);
 368         }
 369
 370 try_devicetree:
 371         type = mfree(type);
 372         r = read_one_line_file("/proc/device-tree/chassis-type", &type);
 373         if (r < 0) {
 374                 log_debug_errno(r, "Failed to read device-tree chassis type, ignoring: %m");
 375                 return NULL;
 376         }
 377
 378         /* Note that the Devicetree specification uses the very same vocabulary
 379          * of chassis types as we do, hence we do not need to translate these types:
 380          *
 381          * https://github.com/devicetree-org/devicetree-specification/blob/master/source/chapter3-devicenodes.rst */
 382         chassis = valid_chassis(type);
 383         if (!chassis)
 384                 log_debug("Invalid device-tree chassis type \"%s\", ignoring.", type);
 385         return chassis;
 386 }
 387
 388 static char* context_get_chassis(Context *c) {
 389         const char *fallback;
 390         char *dmi;
 391
 392         assert(c);
 393
 394         if (!isempty(c->data[PROP_CHASSIS]))
 395                 return strdup(c->data[PROP_CHASSIS]);
 396
 397         if (get_dmi_data("ID_CHASSIS", NULL, &dmi) >= 0)
 398                 return dmi;
 399
 400         fallback = fallback_chassis();
 401         if (fallback)
 402                 return strdup(fallback);
 403
 404         return NULL;
 405 }
 406
 407 static char* context_fallback_icon_name(Context *c) {
 408         _cleanup_free_ char *chassis = NULL;
 409
 410         assert(c);
 411
 412         chassis = context_get_chassis(c);
 413         if (chassis)
 414                 return strjoin("computer-", chassis);
 415
 416         return strdup("computer");
 417 }
 418
 419 static int context_update_kernel_hostname(
 420                 Context *c,
 421                 const char *transient_hn) {
 422
 423         _cleanup_free_ char *_hn_free = NULL;
 424         const char *hn;
 425         HostnameSource hns;
 426         int r;
 427
 428         assert(c);
 429
 430         /* /etc/hostname has the highest preference ... */
 431         if (c->data[PROP_STATIC_HOSTNAME]) {
 432                 hn = c->data[PROP_STATIC_HOSTNAME];
 433                 hns = HOSTNAME_STATIC;
 434
 435         /* ... the transient hostname, (ie: DHCP) comes next ... */
 436         } else if (transient_hn) {
 437                 hn = transient_hn;
 438                 hns = HOSTNAME_TRANSIENT;
 439
 440         /* ... and the ultimate fallback */
 441         } else {
 442                 hn = _hn_free = get_default_hostname();
 443                 if (!hn)
 444                         return log_oom();
 445
 446                 hns = HOSTNAME_DEFAULT;
 447         }
 448
 449         r = sethostname_idempotent(hn);
 450         if (r < 0)
 451                 return log_error_errno(r, "Failed to set hostname: %m");
 452
 453         if (c->hostname_source != hns) {
 454                 c->hostname_source = hns;
 455                 r = 1;
 456         }
 457
 458         (void) nscd_flush_cache(STRV_MAKE("hosts"));
 459
 460         if (r == 0)
 461                 log_debug("Hostname was already set to <%s>.", hn);
 462         else {
 463                 log_info("Hostname set to <%s> (%s)", hn, hostname_source_to_string(hns));
 464
 465                 hostname_update_source_hint(hn, hns);
 466         }
 467
 468         return r; /* 0 if no change, 1 if something was done  */
 469 }
 470
 471 static void unset_statp(struct stat **p) {
 472         if (!*p)
 473                 return;
 474
 475         **p = (struct stat) {};
 476 }
 477
 478 static int context_write_data_static_hostname(Context *c) {
 479         _cleanup_(unset_statp) struct stat *s = NULL;
 480         int r;
 481
 482         assert(c);
 483
 484         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 485          * already, even if we can't make it hit the disk. */
 486         s = &c->etc_hostname_stat;
 487
 488         if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
 489                 if (unlink("/etc/hostname") < 0 && errno != ENOENT)
 490                         return -errno;
 491
 492                 TAKE_PTR(s);
 493                 return 0;
 494         }
 495
 496         r = write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
 497         if (r < 0)
 498                 return r;
 499
 500         TAKE_PTR(s);
 501         return 0;
 502 }
 503
 504 static int context_write_data_machine_info(Context *c) {
 505         _cleanup_(unset_statp) struct stat *s = NULL;
 506         static const char * const name[_PROP_MAX] = {
 507                 [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
 508                 [PROP_ICON_NAME] = "ICON_NAME",
 509                 [PROP_CHASSIS] = "CHASSIS",
 510                 [PROP_DEPLOYMENT] = "DEPLOYMENT",
 511                 [PROP_LOCATION] = "LOCATION",
 512         };
 513         _cleanup_strv_free_ char **l = NULL;
 514         int r;
 515
 516         assert(c);
 517
 518         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 519          * already, even if we can't make it hit the disk. */
 520         s = &c->etc_machine_info_stat;
 521
 522         r = load_env_file(NULL, "/etc/machine-info", &l);
 523         if (r < 0 && r != -ENOENT)
 524                 return r;
 525
 526         for (int p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
 527                 assert(name[p]);
 528
 529                 r = strv_env_assign(&l, name[p], empty_to_null(c->data[p]));
 530                 if (r < 0)
 531                         return r;
 532         }
 533
 534         if (strv_isempty(l)) {
 535                 if (unlink("/etc/machine-info") < 0 && errno != ENOENT)
 536                         return -errno;
 537
 538                 TAKE_PTR(s);
 539                 return 0;
 540         }
 541
 542         r = write_env_file_label("/etc/machine-info", l);
 543         if (r < 0)
 544                 return r;
 545
 546         TAKE_PTR(s);
 547         return 0;
 548 }
 549
 550 static int property_get_hardware_property(
 551                 sd_bus_message *reply,
 552                 Context *c,
 553                 HostProperty prop,
 554                 int (*getter)(char **)) {
 555
 556         _cleanup_free_ char *from_dmi = NULL;
 557
 558         assert(reply);
 559         assert(c);
 560         assert(IN_SET(prop, PROP_VENDOR, PROP_MODEL));
 561         assert(getter);
 562
 563         context_read_machine_info(c);
 564
 565         if (isempty(c->data[prop]))
 566                 (void) getter(&from_dmi);
 567
 568         return sd_bus_message_append(reply, "s", from_dmi ?: c->data[prop]);
 569 }
 570
 571 static int property_get_hardware_vendor(
 572                 sd_bus *bus,
 573                 const char *path,
 574                 const char *interface,
 575                 const char *property,
 576                 sd_bus_message *reply,
 577                 void *userdata,
 578                 sd_bus_error *error) {
 579
 580         return property_get_hardware_property(reply, userdata, PROP_VENDOR, get_hardware_vendor);
 581 }
 582
 583 static int property_get_hardware_model(
 584                 sd_bus *bus,
 585                 const char *path,
 586                 const char *interface,
 587                 const char *property,
 588                 sd_bus_message *reply,
 589                 void *userdata,
 590                 sd_bus_error *error) {
 591
 592         return property_get_hardware_property(reply, userdata, PROP_MODEL, get_hardware_model);
 593 }
 594
 595 static int property_get_hostname(
 596                 sd_bus *bus,
 597                 const char *path,
 598                 const char *interface,
 599                 const char *property,
 600                 sd_bus_message *reply,
 601                 void *userdata,
 602                 sd_bus_error *error) {
 603
 604         _cleanup_free_ char *hn = NULL;
 605         int r;
 606
 607         r = gethostname_strict(&hn);
 608         if (r < 0) {
 609                 if (r != -ENXIO)
 610                         return r;
 611
 612                 hn = get_default_hostname();
 613                 if (!hn)
 614                         return -ENOMEM;
 615         }
 616
 617         return sd_bus_message_append(reply, "s", hn);
 618 }
 619
 620 static int property_get_static_hostname(
 621                 sd_bus *bus,
 622                 const char *path,
 623                 const char *interface,
 624                 const char *property,
 625                 sd_bus_message *reply,
 626                 void *userdata,
 627                 sd_bus_error *error) {
 628
 629         Context *c = userdata;
 630         assert(c);
 631
 632         context_read_etc_hostname(c);
 633
 634         return sd_bus_message_append(reply, "s", c->data[PROP_STATIC_HOSTNAME]);
 635 }
 636
 637 static int property_get_default_hostname(
 638                 sd_bus *bus,
 639                 const char *path,
 640                 const char *interface,
 641                 const char *property,
 642                 sd_bus_message *reply,
 643                 void *userdata,
 644                 sd_bus_error *error) {
 645
 646         _cleanup_free_ char *hn = NULL;
 647
 648         hn = get_default_hostname();
 649         if (!hn)
 650                 return log_oom();
 651
 652         return sd_bus_message_append(reply, "s", hn);
 653 }
 654
 655 static void context_determine_hostname_source(Context *c) {
 656         _cleanup_free_ char *hostname = NULL;
 657         int r;
 658
 659         assert(c);
 660
 661         if (c->hostname_source >= 0)
 662                 return;
 663
 664         (void) gethostname_full(GET_HOSTNAME_ALLOW_LOCALHOST, &hostname);
 665
 666         if (streq_ptr(hostname, c->data[PROP_STATIC_HOSTNAME]))
 667                 c->hostname_source = HOSTNAME_STATIC;
 668         else {
 669                 _cleanup_free_ char *fallback = NULL;
 670
 671                 /* If the hostname was not set by us, try to figure out where it came from. If we set it to
 672                  * the default hostname, the file will tell us. We compare the string because it is possible
 673                  * that the hostname was set by an older version that had a different fallback, in the
 674                  * initramfs or before we reexecuted. */
 675
 676                 r = read_one_line_file("/run/systemd/default-hostname", &fallback);
 677                 if (r < 0 && r != -ENOENT)
 678                         log_warning_errno(r, "Failed to read /run/systemd/default-hostname, ignoring: %m");
 679
 680                 if (streq_ptr(fallback, hostname))
 681                         c->hostname_source = HOSTNAME_DEFAULT;
 682                 else
 683                         c->hostname_source = HOSTNAME_TRANSIENT;
 684         }
 685 }
 686
 687 static int property_get_hostname_source(
 688                 sd_bus *bus,
 689                 const char *path,
 690                 const char *interface,
 691                 const char *property,
 692                 sd_bus_message *reply,
 693                 void *userdata,
 694                 sd_bus_error *error) {
 695
 696         Context *c = userdata;
 697         assert(c);
 698
 699         context_read_etc_hostname(c);
 700         context_determine_hostname_source(c);
 701
 702         return sd_bus_message_append(reply, "s", hostname_source_to_string(c->hostname_source));
 703 }
 704
 705 static int property_get_machine_info_field(
 706                 sd_bus *bus,
 707                 const char *path,
 708                 const char *interface,
 709                 const char *property,
 710                 sd_bus_message *reply,
 711                 void *userdata,
 712                 sd_bus_error *error) {
 713
 714         sd_bus_slot *slot;
 715         Context *c;
 716
 717         /* Acquire the context object without this property's userdata offset added. Explanation: we want
 718          * access to two pointers here: a) the main context object we cache all properties in, and b) the
 719          * pointer to the property field inside the context object that we are supposed to update and
 720          * use. The latter (b) we get in the 'userdata' function parameter, and sd-bus calculates that for us
 721          * from the 'userdata' pointer we supplied when the vtable was registered, with the offset we
 722          * specified in the vtable added on top. To get the former (a) we need the 'userdata' pointer from
 723          * the vtable registration directly, without the offset added. Hence we ask sd-bus what the slot
 724          * object is (which encapsulates the vtable registration), and then query the 'userdata' field
 725          * directly off it. */
 726         assert_se(slot = sd_bus_get_current_slot(bus));
 727         assert_se(c = sd_bus_slot_get_userdata(slot));
 728
 729         context_read_machine_info(c);
 730
 731         return sd_bus_message_append(reply, "s", *(char**) userdata);
 732 }
 733
 734 static int property_get_os_release_field(
 735                 sd_bus *bus,
 736                 const char *path,
 737                 const char *interface,
 738                 const char *property,
 739                 sd_bus_message *reply,
 740                 void *userdata,
 741                 sd_bus_error *error) {
 742
 743         sd_bus_slot *slot;
 744         Context *c;
 745
 746         /* As above, acquire the current context without this property's userdata offset added. */
 747         assert_se(slot = sd_bus_get_current_slot(bus));
 748         assert_se(c = sd_bus_slot_get_userdata(slot));
 749
 750         context_read_os_release(c);
 751
 752         return sd_bus_message_append(reply, "s", *(char**) userdata);
 753 }
 754
 755 static int property_get_icon_name(
 756                 sd_bus *bus,
 757                 const char *path,
 758                 const char *interface,
 759                 const char *property,
 760                 sd_bus_message *reply,
 761                 void *userdata,
 762                 sd_bus_error *error) {
 763
 764         _cleanup_free_ char *n = NULL;
 765         Context *c = userdata;
 766         const char *name;
 767
 768         context_read_machine_info(c);
 769
 770         if (isempty(c->data[PROP_ICON_NAME]))
 771                 name = n = context_fallback_icon_name(c);
 772         else
 773                 name = c->data[PROP_ICON_NAME];
 774
 775         if (!name)
 776                 return -ENOMEM;
 777
 778         return sd_bus_message_append(reply, "s", name);
 779 }
 780
 781 static int property_get_chassis(
 782                 sd_bus *bus,
 783                 const char *path,
 784                 const char *interface,
 785                 const char *property,
 786                 sd_bus_message *reply,
 787                 void *userdata,
 788                 sd_bus_error *error) {
 789
 790         _cleanup_free_ char *chassis = NULL;
 791         Context *c = userdata;
 792
 793         context_read_machine_info(c);
 794
 795         chassis = context_get_chassis(c);
 796
 797         return sd_bus_message_append(reply, "s", chassis);
 798 }
 799
 800 static int property_get_uname_field(
 801                 sd_bus *bus,
 802                 const char *path,
 803                 const char *interface,
 804                 const char *property,
 805                 sd_bus_message *reply,
 806                 void *userdata,
 807                 sd_bus_error *error) {
 808
 809         struct utsname u;
 810
 811         assert_se(uname(&u) >= 0);
 812
 813         return sd_bus_message_append(reply, "s", (char*) &u + PTR_TO_SIZE(userdata));
 814 }
 815
 816 static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 817         Context *c = userdata;
 818         const char *name;
 819         int interactive, r;
 820
 821         assert(m);
 822         assert(c);
 823
 824         r = sd_bus_message_read(m, "sb", &name, &interactive);
 825         if (r < 0)
 826                 return r;
 827
 828         name = empty_to_null(name);
 829
 830         /* We always go through with the procedure below without comparing to the current hostname, because
 831          * we might want to adjust hostname source information even if the actual hostname is unchanged. */
 832
 833         if (name && !hostname_is_valid(name, 0))
 834                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
 835
 836         context_read_etc_hostname(c);
 837
 838         r = bus_verify_polkit_async(
 839                         m,
 840                         CAP_SYS_ADMIN,
 841                         "org.freedesktop.hostname1.set-hostname",
 842                         NULL,
 843                         interactive,
 844                         UID_INVALID,
 845                         &c->polkit_registry,
 846                         error);
 847         if (r < 0)
 848                 return r;
 849         if (r == 0)
 850                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 851
 852         r = context_update_kernel_hostname(c, name);
 853         if (r < 0)
 854                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 855         else if (r > 0)
 856                 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 857                                                       "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 858                                                       "Hostname", "HostnameSource", NULL);
 859
 860         return sd_bus_reply_method_return(m, NULL);
 861 }
 862
 863 static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 864         Context *c = userdata;
 865         const char *name;
 866         int interactive;
 867         int r;
 868
 869         assert(m);
 870         assert(c);
 871
 872         r = sd_bus_message_read(m, "sb", &name, &interactive);
 873         if (r < 0)
 874                 return r;
 875
 876         name = empty_to_null(name);
 877
 878         context_read_etc_hostname(c);
 879
 880         if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
 881                 return sd_bus_reply_method_return(m, NULL);
 882
 883         if (name && !hostname_is_valid(name, 0))
 884                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
 885
 886         r = bus_verify_polkit_async(
 887                         m,
 888                         CAP_SYS_ADMIN,
 889                         "org.freedesktop.hostname1.set-static-hostname",
 890                         NULL,
 891                         interactive,
 892                         UID_INVALID,
 893                         &c->polkit_registry,
 894                         error);
 895         if (r < 0)
 896                 return r;
 897         if (r == 0)
 898                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 899
 900         r = free_and_strdup_warn(&c->data[PROP_STATIC_HOSTNAME], name);
 901         if (r < 0)
 902                 return r;
 903
 904         r = context_write_data_static_hostname(c);
 905         if (r < 0) {
 906                 log_error_errno(r, "Failed to write static hostname: %m");
 907                 if (ERRNO_IS_PRIVILEGE(r))
 908                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/hostname.");
 909                 if (r == -EROFS)
 910                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/hostname is in a read-only filesystem.");
 911                 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %m");
 912         }
 913
 914         r = context_update_kernel_hostname(c, NULL);
 915         if (r < 0) {
 916                 log_error_errno(r, "Failed to set hostname: %m");
 917                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 918         }
 919
 920         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 921                                               "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 922                                               "StaticHostname", "Hostname", "HostnameSource", NULL);
 923
 924         return sd_bus_reply_method_return(m, NULL);
 925 }
 926
 927 static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
 928         int interactive;
 929         const char *name;
 930         int r;
 931
 932         assert(c);
 933         assert(m);
 934
 935         r = sd_bus_message_read(m, "sb", &name, &interactive);
 936         if (r < 0)
 937                 return r;
 938
 939         name = empty_to_null(name);
 940
 941         context_read_machine_info(c);
 942
 943         if (streq_ptr(name, c->data[prop]))
 944                 return sd_bus_reply_method_return(m, NULL);
 945
 946         if (!isempty(name)) {
 947                 /* The icon name might ultimately be used as file
 948                  * name, so better be safe than sorry */
 949
 950                 if (prop == PROP_ICON_NAME && !filename_is_valid(name))
 951                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
 952                 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
 953                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty hostname '%s'", name);
 954                 if (prop == PROP_CHASSIS && !valid_chassis(name))
 955                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
 956                 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
 957                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
 958                 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
 959                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
 960         }
 961
 962         /* Since the pretty hostname should always be changed at the
 963          * same time as the static one, use the same policy action for
 964          * both... */
 965
 966         r = bus_verify_polkit_async(
 967                         m,
 968                         CAP_SYS_ADMIN,
 969                         prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
 970                         NULL,
 971                         interactive,
 972                         UID_INVALID,
 973                         &c->polkit_registry,
 974                         error);
 975         if (r < 0)
 976                 return r;
 977         if (r == 0)
 978                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 979
 980         r = free_and_strdup_warn(&c->data[prop], name);
 981         if (r < 0)
 982                 return r;
 983
 984         r = context_write_data_machine_info(c);
 985         if (r < 0) {
 986                 log_error_errno(r, "Failed to write machine info: %m");
 987                 if (ERRNO_IS_PRIVILEGE(r))
 988                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/machine-info.");
 989                 if (r == -EROFS)
 990                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/machine-info is in a read-only filesystem.");
 991                 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %m");
 992         }
 993
 994         log_info("Changed %s to '%s'",
 995                  prop == PROP_PRETTY_HOSTNAME ? "pretty hostname" :
 996                  prop == PROP_DEPLOYMENT ? "deployment" :
 997                  prop == PROP_LOCATION ? "location" :
 998                  prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
 999
1000         (void) sd_bus_emit_properties_changed(
1001                         sd_bus_message_get_bus(m),
1002                         "/org/freedesktop/hostname1",
1003                         "org.freedesktop.hostname1",
1004                         prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
1005                         prop == PROP_DEPLOYMENT ? "Deployment" :
1006                         prop == PROP_LOCATION ? "Location" :
1007                         prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
1008
1009         return sd_bus_reply_method_return(m, NULL);
1010 }
1011
1012 static int method_set_pretty_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1013         return set_machine_info(userdata, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
1014 }
1015
1016 static int method_set_icon_name(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1017         return set_machine_info(userdata, m, PROP_ICON_NAME, method_set_icon_name, error);
1018 }
1019
1020 static int method_set_chassis(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1021         return set_machine_info(userdata, m, PROP_CHASSIS, method_set_chassis, error);
1022 }
1023
1024 static int method_set_deployment(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1025         return set_machine_info(userdata, m, PROP_DEPLOYMENT, method_set_deployment, error);
1026 }
1027
1028 static int method_set_location(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1029         return set_machine_info(userdata, m, PROP_LOCATION, method_set_location, error);
1030 }
1031
1032 static int method_get_product_uuid(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1033         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1034         Context *c = userdata;
1035         int interactive, r;
1036         sd_id128_t uuid;
1037
1038         assert(m);
1039         assert(c);
1040
1041         r = sd_bus_message_read(m, "b", &interactive);
1042         if (r < 0)
1043                 return r;
1044
1045         r = bus_verify_polkit_async(
1046                         m,
1047                         CAP_SYS_ADMIN,
1048                         "org.freedesktop.hostname1.get-product-uuid",
1049                         NULL,
1050                         interactive,
1051                         UID_INVALID,
1052                         &c->polkit_registry,
1053                         error);
1054         if (r < 0)
1055                 return r;
1056         if (r == 0)
1057                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1058
1059         r = id128_get_product(&uuid);
1060         if (r < 0) {
1061                 if (r == -EADDRNOTAVAIL)
1062                         log_debug_errno(r, "DMI product UUID is all 0x00 or all 0xFF, ignoring.");
1063                 else
1064                         log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
1065                                        "Failed to read product UUID, ignoring: %m");
1066
1067                 return sd_bus_error_set(error, BUS_ERROR_NO_PRODUCT_UUID,
1068                                         "Failed to read product UUID from firmware.");
1069         }
1070
1071         r = sd_bus_message_new_method_return(m, &reply);
1072         if (r < 0)
1073                 return r;
1074
1075         r = sd_bus_message_append_array(reply, 'y', uuid.bytes, sizeof(uuid.bytes));
1076         if (r < 0)
1077                 return r;
1078
1079         return sd_bus_send(NULL, reply, NULL);
1080 }
1081
1082 static int method_get_hardware_serial(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1083         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1084         _cleanup_free_ char *serial = NULL;
1085         Context *c = userdata;
1086         int r;
1087
1088         assert(m);
1089         assert(c);
1090
1091         r = bus_verify_polkit_async(
1092                         m,
1093                         CAP_SYS_ADMIN,
1094                         "org.freedesktop.hostname1.get-hardware-serial",
1095                         NULL,
1096                         false,
1097                         UID_INVALID,
1098                         &c->polkit_registry,
1099                         error);
1100         if (r < 0)
1101                 return r;
1102         if (r == 0)
1103                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1104
1105         r = get_hardware_serial(&serial);
1106         if (r < 0)
1107                 return r;
1108
1109         r = sd_bus_message_new_method_return(m, &reply);
1110         if (r < 0)
1111                 return r;
1112
1113         r = sd_bus_message_append(reply, "s", serial);
1114         if (r < 0)
1115                 return r;
1116
1117         return sd_bus_send(NULL, reply, NULL);
1118 }
1119
1120 static int method_describe(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1121         _cleanup_free_ char *hn = NULL, *dhn = NULL, *in = NULL, *text = NULL,
1122                 *chassis = NULL, *vendor = NULL, *model = NULL, *serial = NULL;
1123         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1124         _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
1125         sd_id128_t product_uuid = SD_ID128_NULL;
1126         Context *c = userdata;
1127         bool privileged;
1128         struct utsname u;
1129         int r;
1130
1131         assert(m);
1132         assert(c);
1133
1134         r = bus_verify_polkit_async(
1135                         m,
1136                         CAP_SYS_ADMIN,
1137                         "org.freedesktop.hostname1.get-description",
1138                         NULL,
1139                         false,
1140                         UID_INVALID,
1141                         &c->polkit_registry,
1142                         NULL);
1143         if (r == 0)
1144                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1145
1146         /* We ignore all authentication errors here, since most data is unprivileged, the one exception being
1147          * the product ID which we'll check explicitly. */
1148         privileged = r > 0;
1149
1150         context_read_etc_hostname(c);
1151         context_read_machine_info(c);
1152         context_read_os_release(c);
1153         context_determine_hostname_source(c);
1154
1155         r = gethostname_strict(&hn);
1156         if (r < 0) {
1157                 if (r != -ENXIO)
1158                         return log_error_errno(r, "Failed to read local host name: %m");
1159
1160                 hn = get_default_hostname();
1161                 if (!hn)
1162                         return log_oom();
1163         }
1164
1165         dhn = get_default_hostname();
1166         if (!dhn)
1167                 return log_oom();
1168
1169         if (isempty(c->data[PROP_ICON_NAME]))
1170                 in = context_fallback_icon_name(c);
1171
1172         chassis = context_get_chassis(c);
1173
1174         assert_se(uname(&u) >= 0);
1175
1176         if (isempty(c->data[PROP_VENDOR]))
1177                 (void) get_hardware_vendor(&vendor);
1178         if (isempty(c->data[PROP_MODEL]))
1179                 (void) get_hardware_model(&model);
1180
1181         if (privileged) {
1182                 /* The product UUID and hardware serial is only available to privileged clients */
1183                 (void) id128_get_product(&product_uuid);
1184                 (void) get_hardware_serial(&serial);
1185         }
1186
1187         r = json_build(&v, JSON_BUILD_OBJECT(
1188                                        JSON_BUILD_PAIR("Hostname", JSON_BUILD_STRING(hn)),
1189                                        JSON_BUILD_PAIR("StaticHostname", JSON_BUILD_STRING(c->data[PROP_STATIC_HOSTNAME])),
1190                                        JSON_BUILD_PAIR("PrettyHostname", JSON_BUILD_STRING(c->data[PROP_PRETTY_HOSTNAME])),
1191                                        JSON_BUILD_PAIR("DefaultHostname", JSON_BUILD_STRING(dhn)),
1192                                        JSON_BUILD_PAIR("HostnameSource", JSON_BUILD_STRING(hostname_source_to_string(c->hostname_source))),
1193                                        JSON_BUILD_PAIR("IconName", JSON_BUILD_STRING(in ?: c->data[PROP_ICON_NAME])),
1194                                        JSON_BUILD_PAIR("Chassis", JSON_BUILD_STRING(chassis)),
1195                                        JSON_BUILD_PAIR("Deployment", JSON_BUILD_STRING(c->data[PROP_DEPLOYMENT])),
1196                                        JSON_BUILD_PAIR("Location", JSON_BUILD_STRING(c->data[PROP_LOCATION])),
1197                                        JSON_BUILD_PAIR("KernelName", JSON_BUILD_STRING(u.sysname)),
1198                                        JSON_BUILD_PAIR("KernelRelease", JSON_BUILD_STRING(u.release)),
1199                                        JSON_BUILD_PAIR("KernelVersion", JSON_BUILD_STRING(u.version)),
1200                                        JSON_BUILD_PAIR("OperatingSystemPrettyName", JSON_BUILD_STRING(c->data[PROP_OS_PRETTY_NAME])),
1201                                        JSON_BUILD_PAIR("OperatingSystemCPEName", JSON_BUILD_STRING(c->data[PROP_OS_CPE_NAME])),
1202                                        JSON_BUILD_PAIR("OperatingSystemHomeURL", JSON_BUILD_STRING(c->data[PROP_OS_HOME_URL])),
1203                                        JSON_BUILD_PAIR("HardwareVendor", JSON_BUILD_STRING(vendor ?: c->data[PROP_VENDOR])),
1204                                        JSON_BUILD_PAIR("HardwareModel", JSON_BUILD_STRING(model ?: c->data[PROP_MODEL])),
1205                                        JSON_BUILD_PAIR("HardwareSerial", JSON_BUILD_STRING(serial)),
1206                                        JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_ID128(product_uuid)),
1207                                        JSON_BUILD_PAIR_CONDITION(sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_NULL)));
1208
1209         if (r < 0)
1210                 return log_error_errno(r, "Failed to build JSON data: %m");
1211
1212         r = json_variant_format(v, 0, &text);
1213         if (r < 0)
1214                 return log_error_errno(r, "Failed to format JSON data: %m");
1215
1216         r = sd_bus_message_new_method_return(m, &reply);
1217         if (r < 0)
1218                 return r;
1219
1220         r = sd_bus_message_append(reply, "s", text);
1221         if (r < 0)
1222                 return r;
1223
1224         return sd_bus_send(NULL, reply, NULL);
1225 }
1226
1227 static const sd_bus_vtable hostname_vtable[] = {
1228         SD_BUS_VTABLE_START(0),
1229         SD_BUS_PROPERTY("Hostname", "s", property_get_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1230         SD_BUS_PROPERTY("StaticHostname", "s", property_get_static_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1231         SD_BUS_PROPERTY("PrettyHostname", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1232         SD_BUS_PROPERTY("DefaultHostname", "s", property_get_default_hostname, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1233         SD_BUS_PROPERTY("HostnameSource", "s", property_get_hostname_source, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1234         SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1235         SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1236         SD_BUS_PROPERTY("Deployment", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1237         SD_BUS_PROPERTY("Location", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1238         SD_BUS_PROPERTY("KernelName", "s", property_get_uname_field, offsetof(struct utsname, sysname), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1239         SD_BUS_PROPERTY("KernelRelease", "s", property_get_uname_field, offsetof(struct utsname, release), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1240         SD_BUS_PROPERTY("KernelVersion", "s", property_get_uname_field, offsetof(struct utsname, version), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1241         SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1242         SD_BUS_PROPERTY("OperatingSystemCPEName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1243         SD_BUS_PROPERTY("HomeURL", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_HOME_URL, SD_BUS_VTABLE_PROPERTY_CONST),
1244         SD_BUS_PROPERTY("HardwareVendor", "s", property_get_hardware_vendor, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1245         SD_BUS_PROPERTY("HardwareModel", "s", property_get_hardware_model, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1246
1247         SD_BUS_METHOD_WITH_NAMES("SetHostname",
1248                                  "sb",
1249                                  SD_BUS_PARAM(hostname)
1250                                  SD_BUS_PARAM(interactive),
1251                                  NULL,,
1252                                  method_set_hostname,
1253                                  SD_BUS_VTABLE_UNPRIVILEGED),
1254         SD_BUS_METHOD_WITH_NAMES("SetStaticHostname",
1255                                  "sb",
1256                                  SD_BUS_PARAM(hostname)
1257                                  SD_BUS_PARAM(interactive),
1258                                  NULL,,
1259                                  method_set_static_hostname,
1260                                  SD_BUS_VTABLE_UNPRIVILEGED),
1261         SD_BUS_METHOD_WITH_NAMES("SetPrettyHostname",
1262                                  "sb",
1263                                  SD_BUS_PARAM(hostname)
1264                                  SD_BUS_PARAM(interactive),
1265                                  NULL,,
1266                                  method_set_pretty_hostname,
1267                                  SD_BUS_VTABLE_UNPRIVILEGED),
1268         SD_BUS_METHOD_WITH_NAMES("SetIconName",
1269                                  "sb",
1270                                  SD_BUS_PARAM(icon)
1271                                  SD_BUS_PARAM(interactive),
1272                                  NULL,,
1273                                  method_set_icon_name,
1274                                  SD_BUS_VTABLE_UNPRIVILEGED),
1275         SD_BUS_METHOD_WITH_NAMES("SetChassis",
1276                                  "sb",
1277                                  SD_BUS_PARAM(chassis)
1278                                  SD_BUS_PARAM(interactive),
1279                                  NULL,,
1280                                  method_set_chassis,
1281                                  SD_BUS_VTABLE_UNPRIVILEGED),
1282         SD_BUS_METHOD_WITH_NAMES("SetDeployment",
1283                                  "sb",
1284                                  SD_BUS_PARAM(deployment)
1285                                  SD_BUS_PARAM(interactive),
1286                                  NULL,,
1287                                  method_set_deployment,
1288                                  SD_BUS_VTABLE_UNPRIVILEGED),
1289         SD_BUS_METHOD_WITH_NAMES("SetLocation",
1290                                  "sb",
1291                                  SD_BUS_PARAM(location)
1292                                  SD_BUS_PARAM(interactive),
1293                                  NULL,,
1294                                  method_set_location,
1295                                  SD_BUS_VTABLE_UNPRIVILEGED),
1296         SD_BUS_METHOD_WITH_NAMES("GetProductUUID",
1297                                  "b",
1298                                  SD_BUS_PARAM(interactive),
1299                                  "ay",
1300                                  SD_BUS_PARAM(uuid),
1301                                  method_get_product_uuid,
1302                                  SD_BUS_VTABLE_UNPRIVILEGED),
1303         SD_BUS_METHOD_WITH_NAMES("GetHardwareSerial",
1304                                  NULL,,
1305                                  "s",
1306                                  SD_BUS_PARAM(serial),
1307                                  method_get_hardware_serial,
1308                                  SD_BUS_VTABLE_UNPRIVILEGED),
1309         SD_BUS_METHOD_WITH_ARGS("Describe",
1310                                 SD_BUS_NO_ARGS,
1311                                 SD_BUS_RESULT("s", json),
1312                                 method_describe,
1313                                 SD_BUS_VTABLE_UNPRIVILEGED),
1314
1315         SD_BUS_VTABLE_END,
1316 };
1317
1318 static const BusObjectImplementation manager_object = {
1319         "/org/freedesktop/hostname1",
1320         "org.freedesktop.hostname1",
1321         .vtables = BUS_VTABLES(hostname_vtable),
1322 };
1323
1324 static int connect_bus(Context *c, sd_event *event, sd_bus **ret) {
1325         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1326         int r;
1327
1328         assert(c);
1329         assert(event);
1330         assert(ret);
1331
1332         r = sd_bus_default_system(&bus);
1333         if (r < 0)
1334                 return log_error_errno(r, "Failed to get system bus connection: %m");
1335
1336         r = bus_add_implementation(bus, &manager_object, c);
1337         if (r < 0)
1338                 return r;
1339
1340         r = bus_log_control_api_register(bus);
1341         if (r < 0)
1342                 return r;
1343
1344         r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.hostname1", 0, NULL, NULL);
1345         if (r < 0)
1346                 return log_error_errno(r, "Failed to request name: %m");
1347
1348         r = sd_bus_attach_event(bus, event, 0);
1349         if (r < 0)
1350                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
1351
1352         *ret = TAKE_PTR(bus);
1353         return 0;
1354 }
1355
1356 static int run(int argc, char *argv[]) {
1357         _cleanup_(context_destroy) Context context = {
1358                 .hostname_source = _HOSTNAME_INVALID, /* appropriate value will be set later */
1359         };
1360         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
1361         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1362         int r;
1363
1364         log_setup();
1365
1366         r = service_parse_argv("systemd-hostnamed.service",
1367                                "Manage the system hostname and related metadata.",
1368                                BUS_IMPLEMENTATIONS(&manager_object,
1369                                                    &log_control_object),
1370                                argc, argv);
1371         if (r <= 0)
1372                 return r;
1373
1374         umask(0022);
1375
1376         r = mac_selinux_init();
1377         if (r < 0)
1378                 return r;
1379
1380         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
1381
1382         r = sd_event_default(&event);
1383         if (r < 0)
1384                 return log_error_errno(r, "Failed to allocate event loop: %m");
1385
1386         (void) sd_event_set_watchdog(event, true);
1387
1388         r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
1389         if (r < 0)
1390                 return log_error_errno(r, "Failed to install SIGINT handler: %m");
1391
1392         r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
1393         if (r < 0)
1394                 return log_error_errno(r, "Failed to install SIGTERM handler: %m");
1395
1396         r = connect_bus(&context, event, &bus);
1397         if (r < 0)
1398                 return r;
1399
1400         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
1401         if (r < 0)
1402                 return log_error_errno(r, "Failed to run event loop: %m");
1403
1404         return 0;
1405 }
1406
1407 DEFINE_MAIN_FUNCTION(run);