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_HARDWARE_VENDOR,
  57         PROP_HARDWARE_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                       (UINT64_C(1) << PROP_HARDWARE_VENDOR) |
 133                       (UINT64_C(1) << PROP_HARDWARE_MODEL));
 134
 135         r = parse_env_file(NULL, "/etc/machine-info",
 136                            "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
 137                            "ICON_NAME", &c->data[PROP_ICON_NAME],
 138                            "CHASSIS", &c->data[PROP_CHASSIS],
 139                            "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
 140                            "LOCATION", &c->data[PROP_LOCATION],
 141                            "HARDWARE_VENDOR", &c->data[PROP_HARDWARE_VENDOR],
 142                            "HARDWARE_MODEL", &c->data[PROP_HARDWARE_MODEL]);
 143         if (r < 0 && r != -ENOENT)
 144                 log_warning_errno(r, "Failed to read /etc/machine-info, ignoring: %m");
 145
 146         c->etc_machine_info_stat = current_stat;
 147 }
 148
 149 static void context_read_os_release(Context *c) {
 150         struct stat current_stat = {};
 151         int r;
 152
 153         assert(c);
 154
 155         if ((stat("/etc/os-release", &current_stat) >= 0 ||
 156              stat("/usr/lib/os-release", &current_stat) >= 0) &&
 157             stat_inode_unmodified(&c->etc_os_release_stat, &current_stat))
 158                 return;
 159
 160         context_reset(c,
 161                       (UINT64_C(1) << PROP_OS_PRETTY_NAME) |
 162                       (UINT64_C(1) << PROP_OS_CPE_NAME) |
 163                       (UINT64_C(1) << PROP_OS_HOME_URL));
 164
 165         r = parse_os_release(NULL,
 166                              "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
 167                              "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
 168                              "HOME_URL", &c->data[PROP_OS_HOME_URL]);
 169         if (r < 0 && r != -ENOENT)
 170                 log_warning_errno(r, "Failed to read os-release file, ignoring: %m");
 171
 172         c->etc_os_release_stat = current_stat;
 173 }
 174
 175 static int get_dmi_data(const char *database_key, const char *regular_key, char **ret) {
 176         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 177         _cleanup_free_ char *b = NULL;
 178         const char *s = NULL;
 179         int r;
 180
 181         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
 182         if (r < 0)
 183                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
 184
 185         if (database_key)
 186                 (void) sd_device_get_property_value(device, database_key, &s);
 187         if (!s && regular_key)
 188                 (void) sd_device_get_property_value(device, regular_key, &s);
 189
 190         if (!ret)
 191                 return !!s;
 192
 193         if (s) {
 194                 b = strdup(s);
 195                 if (!b)
 196                         return -ENOMEM;
 197         }
 198
 199         *ret = TAKE_PTR(b);
 200         return !!s;
 201 }
 202
 203 static int get_hardware_vendor(char **ret) {
 204         return get_dmi_data("ID_VENDOR_FROM_DATABASE", "ID_VENDOR", ret);
 205 }
 206
 207 static int get_hardware_model(char **ret) {
 208         return get_dmi_data("ID_MODEL_FROM_DATABASE", "ID_MODEL", ret);
 209 }
 210
 211 static int get_hardware_firmware_data(const char *sysattr, char **ret) {
 212         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 213         _cleanup_free_ char *b = NULL;
 214         const char *s = NULL;
 215         int r;
 216
 217         assert(sysattr);
 218
 219         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
 220         if (r < 0)
 221                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
 222
 223         (void) sd_device_get_sysattr_value(device, sysattr, &s);
 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 int get_hardware_serial(char **ret) {
 237          int r;
 238
 239          r = get_hardware_firmware_data("product_serial", ret);
 240          if (r <= 0)
 241                 return get_hardware_firmware_data("board_serial", ret);
 242
 243          return r;
 244 }
 245
 246 static int get_firmware_version(char **ret) {
 247          return get_hardware_firmware_data("bios_version", ret);
 248 }
 249
 250 static const char* valid_chassis(const char *chassis) {
 251         assert(chassis);
 252
 253         return nulstr_get(
 254                         "vm\0"
 255                         "container\0"
 256                         "desktop\0"
 257                         "laptop\0"
 258                         "convertible\0"
 259                         "server\0"
 260                         "tablet\0"
 261                         "handset\0"
 262                         "watch\0"
 263                         "embedded\0",
 264                         chassis);
 265 }
 266
 267 static bool valid_deployment(const char *deployment) {
 268         assert(deployment);
 269
 270         return in_charset(deployment, VALID_DEPLOYMENT_CHARS);
 271 }
 272
 273 static const char* fallback_chassis(void) {
 274         const char *chassis;
 275         _cleanup_free_ char *type = NULL;
 276         Virtualization v;
 277         unsigned t;
 278         int r;
 279
 280         v = detect_virtualization();
 281         if (v < 0)
 282                 log_debug_errno(v, "Failed to detect virtualization, ignoring: %m");
 283         else if (VIRTUALIZATION_IS_VM(v))
 284                 return "vm";
 285         else if (VIRTUALIZATION_IS_CONTAINER(v))
 286                 return "container";
 287
 288         r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
 289         if (r < 0) {
 290                 log_debug_errno(r, "Failed to read DMI chassis type, ignoring: %m");
 291                 goto try_acpi;
 292         }
 293
 294         r = safe_atou(type, &t);
 295         if (r < 0) {
 296                 log_debug_errno(r, "Failed to parse DMI chassis type \"%s\", ignoring: %m", type);
 297                 goto try_acpi;
 298         }
 299
 300         /* We only list the really obvious cases here. The DMI data is unreliable enough, so let's not do any
 301          * additional guesswork on top of that.
 302          *
 303          * See the SMBIOS Specification 3.5.0 section 7.4.1 for details about the values listed here:
 304          *
 305          * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.5.0.pdf
 306          */
 307
 308         switch (t) {
 309
 310         case 0x03: /* Desktop */
 311         case 0x04: /* Low Profile Desktop */
 312         case 0x06: /* Mini Tower */
 313         case 0x07: /* Tower */
 314         case 0x0D: /* All in one (i.e. PC built into monitor) */
 315         case 0x23: /* Mini PC */
 316         case 0x24: /* Stick PC */
 317                 return "desktop";
 318
 319         case 0x8: /* Portable */
 320         case 0x9: /* Laptop */
 321         case 0xA: /* Notebook */
 322         case 0xE: /* Sub Notebook */
 323                 return "laptop";
 324
 325         case 0xB: /* Hand Held */
 326                 return "handset";
 327
 328         case 0x11: /* Main Server Chassis */
 329         case 0x1C: /* Blade */
 330         case 0x1D: /* Blade Enclosure */
 331                 return "server";
 332
 333         case 0x1E: /* Tablet */
 334                 return "tablet";
 335
 336         case 0x1F: /* Convertible */
 337         case 0x20: /* Detachable */
 338                 return "convertible";
 339
 340         case 0x21: /* IoT Gateway */
 341         case 0x22: /* Embedded PC */
 342                 return "embedded";
 343
 344         default:
 345                 log_debug("Unhandled DMI chassis type 0x%02x, ignoring.", t);
 346         }
 347
 348 try_acpi:
 349         type = mfree(type);
 350         r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);
 351         if (r < 0) {
 352                 log_debug_errno(r, "Failed read ACPI PM profile, ignoring: %m");
 353                 goto try_devicetree;
 354         }
 355
 356         r = safe_atou(type, &t);
 357         if (r < 0) {
 358                 log_debug_errno(r, "Failed parse ACPI PM profile \"%s\", ignoring: %m", type);
 359                 goto try_devicetree;
 360         }
 361
 362         /* We only list the really obvious cases here as the ACPI data is not really super reliable.
 363          *
 364          * See the ACPI 5.0 Spec Section 5.2.9.1 for details:
 365          *
 366          * http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
 367          */
 368
 369         switch (t) {
 370
 371         case 1: /* Desktop */
 372         case 3: /* Workstation */
 373         case 6: /* Appliance PC */
 374                 return "desktop";
 375
 376         case 2: /* Mobile */
 377                 return "laptop";
 378
 379         case 4: /* Enterprise Server */
 380         case 5: /* SOHO Server */
 381         case 7: /* Performance Server */
 382                 return "server";
 383
 384         case 8: /* Tablet */
 385                 return "tablet";
 386
 387         default:
 388                 log_debug("Unhandled ACPI PM profile 0x%02x, ignoring.", t);
 389         }
 390
 391 try_devicetree:
 392         type = mfree(type);
 393         r = read_one_line_file("/proc/device-tree/chassis-type", &type);
 394         if (r < 0) {
 395                 log_debug_errno(r, "Failed to read device-tree chassis type, ignoring: %m");
 396                 return NULL;
 397         }
 398
 399         /* Note that the Devicetree specification uses the very same vocabulary
 400          * of chassis types as we do, hence we do not need to translate these types:
 401          *
 402          * https://github.com/devicetree-org/devicetree-specification/blob/master/source/chapter3-devicenodes.rst */
 403         chassis = valid_chassis(type);
 404         if (!chassis)
 405                 log_debug("Invalid device-tree chassis type \"%s\", ignoring.", type);
 406         return chassis;
 407 }
 408
 409 static char* context_get_chassis(Context *c) {
 410         const char *fallback;
 411         char *dmi;
 412
 413         assert(c);
 414
 415         if (!isempty(c->data[PROP_CHASSIS]))
 416                 return strdup(c->data[PROP_CHASSIS]);
 417
 418         if (get_dmi_data("ID_CHASSIS", NULL, &dmi) > 0)
 419                 return dmi;
 420
 421         fallback = fallback_chassis();
 422         if (fallback)
 423                 return strdup(fallback);
 424
 425         return NULL;
 426 }
 427
 428 static char* context_fallback_icon_name(Context *c) {
 429         _cleanup_free_ char *chassis = NULL;
 430
 431         assert(c);
 432
 433         chassis = context_get_chassis(c);
 434         if (chassis)
 435                 return strjoin("computer-", chassis);
 436
 437         return strdup("computer");
 438 }
 439
 440 static int context_update_kernel_hostname(
 441                 Context *c,
 442                 const char *transient_hn) {
 443
 444         _cleanup_free_ char *_hn_free = NULL;
 445         const char *hn;
 446         HostnameSource hns;
 447         int r;
 448
 449         assert(c);
 450
 451         /* /etc/hostname has the highest preference ... */
 452         if (c->data[PROP_STATIC_HOSTNAME]) {
 453                 hn = c->data[PROP_STATIC_HOSTNAME];
 454                 hns = HOSTNAME_STATIC;
 455
 456         /* ... the transient hostname, (ie: DHCP) comes next ... */
 457         } else if (transient_hn) {
 458                 hn = transient_hn;
 459                 hns = HOSTNAME_TRANSIENT;
 460
 461         /* ... and the ultimate fallback */
 462         } else {
 463                 hn = _hn_free = get_default_hostname();
 464                 if (!hn)
 465                         return log_oom();
 466
 467                 hns = HOSTNAME_DEFAULT;
 468         }
 469
 470         r = sethostname_idempotent(hn);
 471         if (r < 0)
 472                 return log_error_errno(r, "Failed to set hostname: %m");
 473
 474         if (c->hostname_source != hns) {
 475                 c->hostname_source = hns;
 476                 r = 1;
 477         }
 478
 479         (void) nscd_flush_cache(STRV_MAKE("hosts"));
 480
 481         if (r == 0)
 482                 log_debug("Hostname was already set to <%s>.", hn);
 483         else {
 484                 log_info("Hostname set to <%s> (%s)", hn, hostname_source_to_string(hns));
 485
 486                 hostname_update_source_hint(hn, hns);
 487         }
 488
 489         return r; /* 0 if no change, 1 if something was done  */
 490 }
 491
 492 static void unset_statp(struct stat **p) {
 493         if (!*p)
 494                 return;
 495
 496         **p = (struct stat) {};
 497 }
 498
 499 static int context_write_data_static_hostname(Context *c) {
 500         _cleanup_(unset_statp) struct stat *s = NULL;
 501         int r;
 502
 503         assert(c);
 504
 505         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 506          * already, even if we can't make it hit the disk. */
 507         s = &c->etc_hostname_stat;
 508
 509         if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
 510                 if (unlink("/etc/hostname") < 0 && errno != ENOENT)
 511                         return -errno;
 512
 513                 TAKE_PTR(s);
 514                 return 0;
 515         }
 516
 517         r = write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
 518         if (r < 0)
 519                 return r;
 520
 521         TAKE_PTR(s);
 522         return 0;
 523 }
 524
 525 static int context_write_data_machine_info(Context *c) {
 526         _cleanup_(unset_statp) struct stat *s = NULL;
 527         static const char * const name[_PROP_MAX] = {
 528                 [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
 529                 [PROP_ICON_NAME] = "ICON_NAME",
 530                 [PROP_CHASSIS] = "CHASSIS",
 531                 [PROP_DEPLOYMENT] = "DEPLOYMENT",
 532                 [PROP_LOCATION] = "LOCATION",
 533         };
 534         _cleanup_strv_free_ char **l = NULL;
 535         int r;
 536
 537         assert(c);
 538
 539         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 540          * already, even if we can't make it hit the disk. */
 541         s = &c->etc_machine_info_stat;
 542
 543         r = load_env_file(NULL, "/etc/machine-info", &l);
 544         if (r < 0 && r != -ENOENT)
 545                 return r;
 546
 547         for (int p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
 548                 assert(name[p]);
 549
 550                 r = strv_env_assign(&l, name[p], empty_to_null(c->data[p]));
 551                 if (r < 0)
 552                         return r;
 553         }
 554
 555         if (strv_isempty(l)) {
 556                 if (unlink("/etc/machine-info") < 0 && errno != ENOENT)
 557                         return -errno;
 558
 559                 TAKE_PTR(s);
 560                 return 0;
 561         }
 562
 563         r = write_env_file_label("/etc/machine-info", l);
 564         if (r < 0)
 565                 return r;
 566
 567         TAKE_PTR(s);
 568         return 0;
 569 }
 570
 571 static int property_get_hardware_property(
 572                 sd_bus_message *reply,
 573                 Context *c,
 574                 HostProperty prop,
 575                 int (*getter)(char **)) {
 576
 577         _cleanup_free_ char *from_dmi = NULL;
 578
 579         assert(reply);
 580         assert(c);
 581         assert(IN_SET(prop, PROP_HARDWARE_VENDOR, PROP_HARDWARE_MODEL));
 582         assert(getter);
 583
 584         context_read_machine_info(c);
 585
 586         if (isempty(c->data[prop]))
 587                 (void) getter(&from_dmi);
 588
 589         return sd_bus_message_append(reply, "s", from_dmi ?: c->data[prop]);
 590 }
 591
 592 static int property_get_hardware_vendor(
 593                 sd_bus *bus,
 594                 const char *path,
 595                 const char *interface,
 596                 const char *property,
 597                 sd_bus_message *reply,
 598                 void *userdata,
 599                 sd_bus_error *error) {
 600
 601         return property_get_hardware_property(reply, userdata, PROP_HARDWARE_VENDOR, get_hardware_vendor);
 602 }
 603
 604 static int property_get_hardware_model(
 605                 sd_bus *bus,
 606                 const char *path,
 607                 const char *interface,
 608                 const char *property,
 609                 sd_bus_message *reply,
 610                 void *userdata,
 611                 sd_bus_error *error) {
 612
 613         return property_get_hardware_property(reply, userdata, PROP_HARDWARE_MODEL, get_hardware_model);
 614 }
 615
 616 static int property_get_firmware_version(
 617                 sd_bus *bus,
 618                 const char *path,
 619                 const char *interface,
 620                 const char *property,
 621                 sd_bus_message *reply,
 622                 void *userdata,
 623                 sd_bus_error *error) {
 624
 625         _cleanup_free_ char *firmware_version = NULL;
 626
 627         (void) get_firmware_version(&firmware_version);
 628
 629         return sd_bus_message_append(reply, "s", firmware_version);
 630 }
 631
 632 static int property_get_hostname(
 633                 sd_bus *bus,
 634                 const char *path,
 635                 const char *interface,
 636                 const char *property,
 637                 sd_bus_message *reply,
 638                 void *userdata,
 639                 sd_bus_error *error) {
 640
 641         _cleanup_free_ char *hn = NULL;
 642         int r;
 643
 644         r = gethostname_strict(&hn);
 645         if (r < 0) {
 646                 if (r != -ENXIO)
 647                         return r;
 648
 649                 hn = get_default_hostname();
 650                 if (!hn)
 651                         return -ENOMEM;
 652         }
 653
 654         return sd_bus_message_append(reply, "s", hn);
 655 }
 656
 657 static int property_get_static_hostname(
 658                 sd_bus *bus,
 659                 const char *path,
 660                 const char *interface,
 661                 const char *property,
 662                 sd_bus_message *reply,
 663                 void *userdata,
 664                 sd_bus_error *error) {
 665
 666         Context *c = ASSERT_PTR(userdata);
 667
 668         context_read_etc_hostname(c);
 669
 670         return sd_bus_message_append(reply, "s", c->data[PROP_STATIC_HOSTNAME]);
 671 }
 672
 673 static int property_get_default_hostname(
 674                 sd_bus *bus,
 675                 const char *path,
 676                 const char *interface,
 677                 const char *property,
 678                 sd_bus_message *reply,
 679                 void *userdata,
 680                 sd_bus_error *error) {
 681
 682         _cleanup_free_ char *hn = NULL;
 683
 684         hn = get_default_hostname();
 685         if (!hn)
 686                 return log_oom();
 687
 688         return sd_bus_message_append(reply, "s", hn);
 689 }
 690
 691 static void context_determine_hostname_source(Context *c) {
 692         _cleanup_free_ char *hostname = NULL;
 693         int r;
 694
 695         assert(c);
 696
 697         if (c->hostname_source >= 0)
 698                 return;
 699
 700         (void) gethostname_full(GET_HOSTNAME_ALLOW_LOCALHOST, &hostname);
 701
 702         if (streq_ptr(hostname, c->data[PROP_STATIC_HOSTNAME]))
 703                 c->hostname_source = HOSTNAME_STATIC;
 704         else {
 705                 _cleanup_free_ char *fallback = NULL;
 706
 707                 /* If the hostname was not set by us, try to figure out where it came from. If we set it to
 708                  * the default hostname, the file will tell us. We compare the string because it is possible
 709                  * that the hostname was set by an older version that had a different fallback, in the
 710                  * initramfs or before we reexecuted. */
 711
 712                 r = read_one_line_file("/run/systemd/default-hostname", &fallback);
 713                 if (r < 0 && r != -ENOENT)
 714                         log_warning_errno(r, "Failed to read /run/systemd/default-hostname, ignoring: %m");
 715
 716                 if (streq_ptr(fallback, hostname))
 717                         c->hostname_source = HOSTNAME_DEFAULT;
 718                 else
 719                         c->hostname_source = HOSTNAME_TRANSIENT;
 720         }
 721 }
 722
 723 static int property_get_hostname_source(
 724                 sd_bus *bus,
 725                 const char *path,
 726                 const char *interface,
 727                 const char *property,
 728                 sd_bus_message *reply,
 729                 void *userdata,
 730                 sd_bus_error *error) {
 731
 732         Context *c = ASSERT_PTR(userdata);
 733
 734         context_read_etc_hostname(c);
 735         context_determine_hostname_source(c);
 736
 737         return sd_bus_message_append(reply, "s", hostname_source_to_string(c->hostname_source));
 738 }
 739
 740 static int property_get_machine_info_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         sd_bus_slot *slot;
 750         Context *c;
 751
 752         /* Acquire the context object without this property's userdata offset added. Explanation: we want
 753          * access to two pointers here: a) the main context object we cache all properties in, and b) the
 754          * pointer to the property field inside the context object that we are supposed to update and
 755          * use. The latter (b) we get in the 'userdata' function parameter, and sd-bus calculates that for us
 756          * from the 'userdata' pointer we supplied when the vtable was registered, with the offset we
 757          * specified in the vtable added on top. To get the former (a) we need the 'userdata' pointer from
 758          * the vtable registration directly, without the offset added. Hence we ask sd-bus what the slot
 759          * object is (which encapsulates the vtable registration), and then query the 'userdata' field
 760          * directly off it. */
 761         assert_se(slot = sd_bus_get_current_slot(bus));
 762         assert_se(c = sd_bus_slot_get_userdata(slot));
 763
 764         context_read_machine_info(c);
 765
 766         return sd_bus_message_append(reply, "s", *(char**) userdata);
 767 }
 768
 769 static int property_get_os_release_field(
 770                 sd_bus *bus,
 771                 const char *path,
 772                 const char *interface,
 773                 const char *property,
 774                 sd_bus_message *reply,
 775                 void *userdata,
 776                 sd_bus_error *error) {
 777
 778         sd_bus_slot *slot;
 779         Context *c;
 780
 781         /* As above, acquire the current context without this property's userdata offset added. */
 782         assert_se(slot = sd_bus_get_current_slot(bus));
 783         assert_se(c = sd_bus_slot_get_userdata(slot));
 784
 785         context_read_os_release(c);
 786
 787         return sd_bus_message_append(reply, "s", *(char**) userdata);
 788 }
 789
 790 static int property_get_icon_name(
 791                 sd_bus *bus,
 792                 const char *path,
 793                 const char *interface,
 794                 const char *property,
 795                 sd_bus_message *reply,
 796                 void *userdata,
 797                 sd_bus_error *error) {
 798
 799         _cleanup_free_ char *n = NULL;
 800         Context *c = userdata;
 801         const char *name;
 802
 803         context_read_machine_info(c);
 804
 805         if (isempty(c->data[PROP_ICON_NAME]))
 806                 name = n = context_fallback_icon_name(c);
 807         else
 808                 name = c->data[PROP_ICON_NAME];
 809
 810         if (!name)
 811                 return -ENOMEM;
 812
 813         return sd_bus_message_append(reply, "s", name);
 814 }
 815
 816 static int property_get_chassis(
 817                 sd_bus *bus,
 818                 const char *path,
 819                 const char *interface,
 820                 const char *property,
 821                 sd_bus_message *reply,
 822                 void *userdata,
 823                 sd_bus_error *error) {
 824
 825         _cleanup_free_ char *chassis = NULL;
 826         Context *c = userdata;
 827
 828         context_read_machine_info(c);
 829
 830         chassis = context_get_chassis(c);
 831
 832         return sd_bus_message_append(reply, "s", chassis);
 833 }
 834
 835 static int property_get_uname_field(
 836                 sd_bus *bus,
 837                 const char *path,
 838                 const char *interface,
 839                 const char *property,
 840                 sd_bus_message *reply,
 841                 void *userdata,
 842                 sd_bus_error *error) {
 843
 844         struct utsname u;
 845
 846         assert_se(uname(&u) >= 0);
 847
 848         return sd_bus_message_append(reply, "s", (char*) &u + PTR_TO_SIZE(userdata));
 849 }
 850
 851 static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 852         Context *c = ASSERT_PTR(userdata);
 853         const char *name;
 854         int interactive, r;
 855
 856         assert(m);
 857
 858         r = sd_bus_message_read(m, "sb", &name, &interactive);
 859         if (r < 0)
 860                 return r;
 861
 862         name = empty_to_null(name);
 863
 864         /* We always go through with the procedure below without comparing to the current hostname, because
 865          * we might want to adjust hostname source information even if the actual hostname is unchanged. */
 866
 867         if (name && !hostname_is_valid(name, 0))
 868                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
 869
 870         context_read_etc_hostname(c);
 871
 872         r = bus_verify_polkit_async(
 873                         m,
 874                         CAP_SYS_ADMIN,
 875                         "org.freedesktop.hostname1.set-hostname",
 876                         NULL,
 877                         interactive,
 878                         UID_INVALID,
 879                         &c->polkit_registry,
 880                         error);
 881         if (r < 0)
 882                 return r;
 883         if (r == 0)
 884                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 885
 886         r = context_update_kernel_hostname(c, name);
 887         if (r < 0)
 888                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 889         else if (r > 0)
 890                 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 891                                                       "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 892                                                       "Hostname", "HostnameSource", NULL);
 893
 894         return sd_bus_reply_method_return(m, NULL);
 895 }
 896
 897 static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 898         Context *c = ASSERT_PTR(userdata);
 899         const char *name;
 900         int interactive;
 901         int r;
 902
 903         assert(m);
 904
 905         r = sd_bus_message_read(m, "sb", &name, &interactive);
 906         if (r < 0)
 907                 return r;
 908
 909         name = empty_to_null(name);
 910
 911         context_read_etc_hostname(c);
 912
 913         if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
 914                 return sd_bus_reply_method_return(m, NULL);
 915
 916         if (name && !hostname_is_valid(name, 0))
 917                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
 918
 919         r = bus_verify_polkit_async(
 920                         m,
 921                         CAP_SYS_ADMIN,
 922                         "org.freedesktop.hostname1.set-static-hostname",
 923                         NULL,
 924                         interactive,
 925                         UID_INVALID,
 926                         &c->polkit_registry,
 927                         error);
 928         if (r < 0)
 929                 return r;
 930         if (r == 0)
 931                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 932
 933         r = free_and_strdup_warn(&c->data[PROP_STATIC_HOSTNAME], name);
 934         if (r < 0)
 935                 return r;
 936
 937         r = context_write_data_static_hostname(c);
 938         if (r < 0) {
 939                 log_error_errno(r, "Failed to write static hostname: %m");
 940                 if (ERRNO_IS_PRIVILEGE(r))
 941                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/hostname.");
 942                 if (r == -EROFS)
 943                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/hostname is in a read-only filesystem.");
 944                 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %m");
 945         }
 946
 947         r = context_update_kernel_hostname(c, NULL);
 948         if (r < 0) {
 949                 log_error_errno(r, "Failed to set hostname: %m");
 950                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 951         }
 952
 953         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 954                                               "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 955                                               "StaticHostname", "Hostname", "HostnameSource", NULL);
 956
 957         return sd_bus_reply_method_return(m, NULL);
 958 }
 959
 960 static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
 961         int interactive;
 962         const char *name;
 963         int r;
 964
 965         assert(c);
 966         assert(m);
 967
 968         r = sd_bus_message_read(m, "sb", &name, &interactive);
 969         if (r < 0)
 970                 return r;
 971
 972         name = empty_to_null(name);
 973
 974         context_read_machine_info(c);
 975
 976         if (streq_ptr(name, c->data[prop]))
 977                 return sd_bus_reply_method_return(m, NULL);
 978
 979         if (!isempty(name)) {
 980                 /* The icon name might ultimately be used as file
 981                  * name, so better be safe than sorry */
 982
 983                 if (prop == PROP_ICON_NAME && !filename_is_valid(name))
 984                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
 985                 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
 986                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty hostname '%s'", name);
 987                 if (prop == PROP_CHASSIS && !valid_chassis(name))
 988                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
 989                 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
 990                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
 991                 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
 992                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
 993         }
 994
 995         /* Since the pretty hostname should always be changed at the
 996          * same time as the static one, use the same policy action for
 997          * both... */
 998
 999         r = bus_verify_polkit_async(
1000                         m,
1001                         CAP_SYS_ADMIN,
1002                         prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
1003                         NULL,
1004                         interactive,
1005                         UID_INVALID,
1006                         &c->polkit_registry,
1007                         error);
1008         if (r < 0)
1009                 return r;
1010         if (r == 0)
1011                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1012
1013         r = free_and_strdup_warn(&c->data[prop], name);
1014         if (r < 0)
1015                 return r;
1016
1017         r = context_write_data_machine_info(c);
1018         if (r < 0) {
1019                 log_error_errno(r, "Failed to write machine info: %m");
1020                 if (ERRNO_IS_PRIVILEGE(r))
1021                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/machine-info.");
1022                 if (r == -EROFS)
1023                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/machine-info is in a read-only filesystem.");
1024                 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %m");
1025         }
1026
1027         log_info("Changed %s to '%s'",
1028                  prop == PROP_PRETTY_HOSTNAME ? "pretty hostname" :
1029                  prop == PROP_DEPLOYMENT ? "deployment" :
1030                  prop == PROP_LOCATION ? "location" :
1031                  prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
1032
1033         (void) sd_bus_emit_properties_changed(
1034                         sd_bus_message_get_bus(m),
1035                         "/org/freedesktop/hostname1",
1036                         "org.freedesktop.hostname1",
1037                         prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
1038                         prop == PROP_DEPLOYMENT ? "Deployment" :
1039                         prop == PROP_LOCATION ? "Location" :
1040                         prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
1041
1042         return sd_bus_reply_method_return(m, NULL);
1043 }
1044
1045 static int method_set_pretty_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1046         return set_machine_info(userdata, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
1047 }
1048
1049 static int method_set_icon_name(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1050         return set_machine_info(userdata, m, PROP_ICON_NAME, method_set_icon_name, error);
1051 }
1052
1053 static int method_set_chassis(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1054         return set_machine_info(userdata, m, PROP_CHASSIS, method_set_chassis, error);
1055 }
1056
1057 static int method_set_deployment(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1058         return set_machine_info(userdata, m, PROP_DEPLOYMENT, method_set_deployment, error);
1059 }
1060
1061 static int method_set_location(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1062         return set_machine_info(userdata, m, PROP_LOCATION, method_set_location, error);
1063 }
1064
1065 static int method_get_product_uuid(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1066         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1067         Context *c = ASSERT_PTR(userdata);
1068         int interactive, r;
1069         sd_id128_t uuid;
1070
1071         assert(m);
1072
1073         r = sd_bus_message_read(m, "b", &interactive);
1074         if (r < 0)
1075                 return r;
1076
1077         r = bus_verify_polkit_async(
1078                         m,
1079                         CAP_SYS_ADMIN,
1080                         "org.freedesktop.hostname1.get-product-uuid",
1081                         NULL,
1082                         interactive,
1083                         UID_INVALID,
1084                         &c->polkit_registry,
1085                         error);
1086         if (r < 0)
1087                 return r;
1088         if (r == 0)
1089                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1090
1091         r = id128_get_product(&uuid);
1092         if (r < 0) {
1093                 if (r == -EADDRNOTAVAIL)
1094                         log_debug_errno(r, "DMI product UUID is all 0x00 or all 0xFF, ignoring.");
1095                 else
1096                         log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
1097                                        "Failed to read product UUID, ignoring: %m");
1098
1099                 return sd_bus_error_set(error, BUS_ERROR_NO_PRODUCT_UUID,
1100                                         "Failed to read product UUID from firmware.");
1101         }
1102
1103         r = sd_bus_message_new_method_return(m, &reply);
1104         if (r < 0)
1105                 return r;
1106
1107         r = sd_bus_message_append_array(reply, 'y', uuid.bytes, sizeof(uuid.bytes));
1108         if (r < 0)
1109                 return r;
1110
1111         return sd_bus_send(NULL, reply, NULL);
1112 }
1113
1114 static int method_get_hardware_serial(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1115         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1116         _cleanup_free_ char *serial = NULL;
1117         Context *c = ASSERT_PTR(userdata);
1118         int r;
1119
1120         assert(m);
1121
1122         r = bus_verify_polkit_async(
1123                         m,
1124                         CAP_SYS_ADMIN,
1125                         "org.freedesktop.hostname1.get-hardware-serial",
1126                         NULL,
1127                         false,
1128                         UID_INVALID,
1129                         &c->polkit_registry,
1130                         error);
1131         if (r < 0)
1132                 return r;
1133         if (r == 0)
1134                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1135
1136         r = get_hardware_serial(&serial);
1137         if (r < 0)
1138                 return r;
1139
1140         r = sd_bus_message_new_method_return(m, &reply);
1141         if (r < 0)
1142                 return r;
1143
1144         r = sd_bus_message_append(reply, "s", serial);
1145         if (r < 0)
1146                 return r;
1147
1148         return sd_bus_send(NULL, reply, NULL);
1149 }
1150
1151 static int method_describe(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1152         _cleanup_free_ char *hn = NULL, *dhn = NULL, *in = NULL, *text = NULL,
1153                 *chassis = NULL, *vendor = NULL, *model = NULL, *serial = NULL, *firmware_version = NULL;
1154         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1155         _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
1156         sd_id128_t product_uuid = SD_ID128_NULL;
1157         Context *c = ASSERT_PTR(userdata);
1158         bool privileged;
1159         struct utsname u;
1160         int r;
1161
1162         assert(m);
1163
1164         r = bus_verify_polkit_async(
1165                         m,
1166                         CAP_SYS_ADMIN,
1167                         "org.freedesktop.hostname1.get-description",
1168                         NULL,
1169                         false,
1170                         UID_INVALID,
1171                         &c->polkit_registry,
1172                         NULL);
1173         if (r == 0)
1174                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1175
1176         /* We ignore all authentication errors here, since most data is unprivileged, the one exception being
1177          * the product ID which we'll check explicitly. */
1178         privileged = r > 0;
1179
1180         context_read_etc_hostname(c);
1181         context_read_machine_info(c);
1182         context_read_os_release(c);
1183         context_determine_hostname_source(c);
1184
1185         r = gethostname_strict(&hn);
1186         if (r < 0) {
1187                 if (r != -ENXIO)
1188                         return log_error_errno(r, "Failed to read local host name: %m");
1189
1190                 hn = get_default_hostname();
1191                 if (!hn)
1192                         return log_oom();
1193         }
1194
1195         dhn = get_default_hostname();
1196         if (!dhn)
1197                 return log_oom();
1198
1199         if (isempty(c->data[PROP_ICON_NAME]))
1200                 in = context_fallback_icon_name(c);
1201
1202         chassis = context_get_chassis(c);
1203
1204         assert_se(uname(&u) >= 0);
1205
1206         if (isempty(c->data[PROP_HARDWARE_VENDOR]))
1207                 (void) get_hardware_vendor(&vendor);
1208         if (isempty(c->data[PROP_HARDWARE_MODEL]))
1209                 (void) get_hardware_model(&model);
1210
1211         if (privileged) {
1212                 /* The product UUID and hardware serial is only available to privileged clients */
1213                 (void) id128_get_product(&product_uuid);
1214                 (void) get_hardware_serial(&serial);
1215         }
1216         (void) get_firmware_version(&firmware_version);
1217
1218         r = json_build(&v, JSON_BUILD_OBJECT(
1219                                        JSON_BUILD_PAIR("Hostname", JSON_BUILD_STRING(hn)),
1220                                        JSON_BUILD_PAIR("StaticHostname", JSON_BUILD_STRING(c->data[PROP_STATIC_HOSTNAME])),
1221                                        JSON_BUILD_PAIR("PrettyHostname", JSON_BUILD_STRING(c->data[PROP_PRETTY_HOSTNAME])),
1222                                        JSON_BUILD_PAIR("DefaultHostname", JSON_BUILD_STRING(dhn)),
1223                                        JSON_BUILD_PAIR("HostnameSource", JSON_BUILD_STRING(hostname_source_to_string(c->hostname_source))),
1224                                        JSON_BUILD_PAIR("IconName", JSON_BUILD_STRING(in ?: c->data[PROP_ICON_NAME])),
1225                                        JSON_BUILD_PAIR("Chassis", JSON_BUILD_STRING(chassis)),
1226                                        JSON_BUILD_PAIR("Deployment", JSON_BUILD_STRING(c->data[PROP_DEPLOYMENT])),
1227                                        JSON_BUILD_PAIR("Location", JSON_BUILD_STRING(c->data[PROP_LOCATION])),
1228                                        JSON_BUILD_PAIR("KernelName", JSON_BUILD_STRING(u.sysname)),
1229                                        JSON_BUILD_PAIR("KernelRelease", JSON_BUILD_STRING(u.release)),
1230                                        JSON_BUILD_PAIR("KernelVersion", JSON_BUILD_STRING(u.version)),
1231                                        JSON_BUILD_PAIR("OperatingSystemPrettyName", JSON_BUILD_STRING(c->data[PROP_OS_PRETTY_NAME])),
1232                                        JSON_BUILD_PAIR("OperatingSystemCPEName", JSON_BUILD_STRING(c->data[PROP_OS_CPE_NAME])),
1233                                        JSON_BUILD_PAIR("OperatingSystemHomeURL", JSON_BUILD_STRING(c->data[PROP_OS_HOME_URL])),
1234                                        JSON_BUILD_PAIR("HardwareVendor", JSON_BUILD_STRING(vendor ?: c->data[PROP_HARDWARE_VENDOR])),
1235                                        JSON_BUILD_PAIR("HardwareModel", JSON_BUILD_STRING(model ?: c->data[PROP_HARDWARE_MODEL])),
1236                                        JSON_BUILD_PAIR("HardwareSerial", JSON_BUILD_STRING(serial)),
1237                                        JSON_BUILD_PAIR("FirmwareVersion", JSON_BUILD_STRING(firmware_version)),
1238                                        JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_ID128(product_uuid)),
1239                                        JSON_BUILD_PAIR_CONDITION(sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_NULL)));
1240
1241         if (r < 0)
1242                 return log_error_errno(r, "Failed to build JSON data: %m");
1243
1244         r = json_variant_format(v, 0, &text);
1245         if (r < 0)
1246                 return log_error_errno(r, "Failed to format JSON data: %m");
1247
1248         r = sd_bus_message_new_method_return(m, &reply);
1249         if (r < 0)
1250                 return r;
1251
1252         r = sd_bus_message_append(reply, "s", text);
1253         if (r < 0)
1254                 return r;
1255
1256         return sd_bus_send(NULL, reply, NULL);
1257 }
1258
1259 static const sd_bus_vtable hostname_vtable[] = {
1260         SD_BUS_VTABLE_START(0),
1261         SD_BUS_PROPERTY("Hostname", "s", property_get_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1262         SD_BUS_PROPERTY("StaticHostname", "s", property_get_static_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1263         SD_BUS_PROPERTY("PrettyHostname", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1264         SD_BUS_PROPERTY("DefaultHostname", "s", property_get_default_hostname, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1265         SD_BUS_PROPERTY("HostnameSource", "s", property_get_hostname_source, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1266         SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1267         SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1268         SD_BUS_PROPERTY("Deployment", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1269         SD_BUS_PROPERTY("Location", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1270         SD_BUS_PROPERTY("KernelName", "s", property_get_uname_field, offsetof(struct utsname, sysname), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1271         SD_BUS_PROPERTY("KernelRelease", "s", property_get_uname_field, offsetof(struct utsname, release), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1272         SD_BUS_PROPERTY("KernelVersion", "s", property_get_uname_field, offsetof(struct utsname, version), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1273         SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1274         SD_BUS_PROPERTY("OperatingSystemCPEName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1275         SD_BUS_PROPERTY("HomeURL", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_HOME_URL, SD_BUS_VTABLE_PROPERTY_CONST),
1276         SD_BUS_PROPERTY("HardwareVendor", "s", property_get_hardware_vendor, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1277         SD_BUS_PROPERTY("HardwareModel", "s", property_get_hardware_model, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1278         SD_BUS_PROPERTY("FirmwareVersion", "s", property_get_firmware_version, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1279
1280         SD_BUS_METHOD_WITH_ARGS("SetHostname",
1281                                 SD_BUS_ARGS("s", hostname, "b", interactive),
1282                                 SD_BUS_NO_RESULT,
1283                                 method_set_hostname,
1284                                 SD_BUS_VTABLE_UNPRIVILEGED),
1285         SD_BUS_METHOD_WITH_ARGS("SetStaticHostname",
1286                                 SD_BUS_ARGS("s", hostname, "b", interactive),
1287                                 SD_BUS_NO_RESULT,
1288                                 method_set_static_hostname,
1289                                 SD_BUS_VTABLE_UNPRIVILEGED),
1290         SD_BUS_METHOD_WITH_ARGS("SetPrettyHostname",
1291                                 SD_BUS_ARGS("s", hostname, "b", interactive),
1292                                 SD_BUS_NO_RESULT,
1293                                 method_set_pretty_hostname,
1294                                 SD_BUS_VTABLE_UNPRIVILEGED),
1295         SD_BUS_METHOD_WITH_ARGS("SetIconName",
1296                                 SD_BUS_ARGS("s", icon, "b", interactive),
1297                                 SD_BUS_NO_RESULT,
1298                                 method_set_icon_name,
1299                                 SD_BUS_VTABLE_UNPRIVILEGED),
1300         SD_BUS_METHOD_WITH_ARGS("SetChassis",
1301                                 SD_BUS_ARGS("s", chassis, "b", interactive),
1302                                 SD_BUS_NO_RESULT,
1303                                 method_set_chassis,
1304                                 SD_BUS_VTABLE_UNPRIVILEGED),
1305         SD_BUS_METHOD_WITH_ARGS("SetDeployment",
1306                                 SD_BUS_ARGS("s", deployment, "b", interactive),
1307                                 SD_BUS_NO_RESULT,
1308                                 method_set_deployment,
1309                                 SD_BUS_VTABLE_UNPRIVILEGED),
1310         SD_BUS_METHOD_WITH_ARGS("SetLocation",
1311                                 SD_BUS_ARGS("s", location, "b", interactive),
1312                                 SD_BUS_NO_RESULT,
1313                                 method_set_location,
1314                                 SD_BUS_VTABLE_UNPRIVILEGED),
1315         SD_BUS_METHOD_WITH_ARGS("GetProductUUID",
1316                                 SD_BUS_ARGS("b", interactive),
1317                                 SD_BUS_RESULT("ay", uuid),
1318                                 method_get_product_uuid,
1319                                 SD_BUS_VTABLE_UNPRIVILEGED),
1320         SD_BUS_METHOD_WITH_ARGS("GetHardwareSerial",
1321                                 SD_BUS_NO_ARGS,
1322                                 SD_BUS_RESULT("s", serial),
1323                                 method_get_hardware_serial,
1324                                 SD_BUS_VTABLE_UNPRIVILEGED),
1325         SD_BUS_METHOD_WITH_ARGS("Describe",
1326                                 SD_BUS_NO_ARGS,
1327                                 SD_BUS_RESULT("s", json),
1328                                 method_describe,
1329                                 SD_BUS_VTABLE_UNPRIVILEGED),
1330
1331         SD_BUS_VTABLE_END,
1332 };
1333
1334 static const BusObjectImplementation manager_object = {
1335         "/org/freedesktop/hostname1",
1336         "org.freedesktop.hostname1",
1337         .vtables = BUS_VTABLES(hostname_vtable),
1338 };
1339
1340 static int connect_bus(Context *c, sd_event *event, sd_bus **ret) {
1341         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1342         int r;
1343
1344         assert(c);
1345         assert(event);
1346         assert(ret);
1347
1348         r = sd_bus_default_system(&bus);
1349         if (r < 0)
1350                 return log_error_errno(r, "Failed to get system bus connection: %m");
1351
1352         r = bus_add_implementation(bus, &manager_object, c);
1353         if (r < 0)
1354                 return r;
1355
1356         r = bus_log_control_api_register(bus);
1357         if (r < 0)
1358                 return r;
1359
1360         r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.hostname1", 0, NULL, NULL);
1361         if (r < 0)
1362                 return log_error_errno(r, "Failed to request name: %m");
1363
1364         r = sd_bus_attach_event(bus, event, 0);
1365         if (r < 0)
1366                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
1367
1368         *ret = TAKE_PTR(bus);
1369         return 0;
1370 }
1371
1372 static int run(int argc, char *argv[]) {
1373         _cleanup_(context_destroy) Context context = {
1374                 .hostname_source = _HOSTNAME_INVALID, /* appropriate value will be set later */
1375         };
1376         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
1377         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1378         int r;
1379
1380         log_setup();
1381
1382         r = service_parse_argv("systemd-hostnamed.service",
1383                                "Manage the system hostname and related metadata.",
1384                                BUS_IMPLEMENTATIONS(&manager_object,
1385                                                    &log_control_object),
1386                                argc, argv);
1387         if (r <= 0)
1388                 return r;
1389
1390         umask(0022);
1391
1392         r = mac_selinux_init();
1393         if (r < 0)
1394                 return r;
1395
1396         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
1397
1398         r = sd_event_default(&event);
1399         if (r < 0)
1400                 return log_error_errno(r, "Failed to allocate event loop: %m");
1401
1402         (void) sd_event_set_watchdog(event, true);
1403
1404         r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
1405         if (r < 0)
1406                 return log_error_errno(r, "Failed to install SIGINT handler: %m");
1407
1408         r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
1409         if (r < 0)
1410                 return log_error_errno(r, "Failed to install SIGTERM handler: %m");
1411
1412         r = connect_bus(&context, event, &bus);
1413         if (r < 0)
1414                 return r;
1415
1416         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
1417         if (r < 0)
1418                 return log_error_errno(r, "Failed to run event loop: %m");
1419
1420         return 0;
1421 }
1422
1423 DEFINE_MAIN_FUNCTION(run);