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 "constants.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 "virt.h"
  40
  41 #define VALID_DEPLOYMENT_CHARS (DIGITS LETTERS "-.:")
  42
  43 /* Properties we cache are indexed by an enum, to make invalidation easy and systematic (as we can iterate
  44  * through them all, and they are uniformly strings). */
  45 typedef enum {
  46         /* Read from /etc/hostname */
  47         PROP_STATIC_HOSTNAME,
  48
  49         /* Read from /etc/machine-info */
  50         PROP_PRETTY_HOSTNAME,
  51         PROP_ICON_NAME,
  52         PROP_CHASSIS,
  53         PROP_DEPLOYMENT,
  54         PROP_LOCATION,
  55         PROP_HARDWARE_VENDOR,
  56         PROP_HARDWARE_MODEL,
  57
  58         /* Read from /etc/os-release (or /usr/lib/os-release) */
  59         PROP_OS_PRETTY_NAME,
  60         PROP_OS_CPE_NAME,
  61         PROP_OS_HOME_URL,
  62         _PROP_MAX,
  63         _PROP_INVALID = -EINVAL,
  64 } HostProperty;
  65
  66 typedef struct Context {
  67         char *data[_PROP_MAX];
  68
  69         HostnameSource hostname_source;
  70
  71         struct stat etc_hostname_stat;
  72         struct stat etc_os_release_stat;
  73         struct stat etc_machine_info_stat;
  74
  75         Hashmap *polkit_registry;
  76 } Context;
  77
  78 static void context_reset(Context *c, uint64_t mask) {
  79         assert(c);
  80
  81         for (int p = 0; p < _PROP_MAX; p++) {
  82                 if (!FLAGS_SET(mask, UINT64_C(1) << p))
  83                         continue;
  84
  85                 c->data[p] = mfree(c->data[p]);
  86         }
  87 }
  88
  89 static void context_destroy(Context *c) {
  90         assert(c);
  91
  92         context_reset(c, UINT64_MAX);
  93         bus_verify_polkit_async_registry_free(c->polkit_registry);
  94 }
  95
  96 static void context_read_etc_hostname(Context *c) {
  97         struct stat current_stat = {};
  98         int r;
  99
 100         assert(c);
 101
 102         if (stat("/etc/hostname", &current_stat) >= 0 &&
 103             stat_inode_unmodified(&c->etc_hostname_stat, &current_stat))
 104                 return;
 105
 106         context_reset(c, UINT64_C(1) << PROP_STATIC_HOSTNAME);
 107
 108         r = read_etc_hostname(NULL, &c->data[PROP_STATIC_HOSTNAME]);
 109         if (r < 0 && r != -ENOENT)
 110                 log_warning_errno(r, "Failed to read /etc/hostname, ignoring: %m");
 111
 112         c->etc_hostname_stat = current_stat;
 113 }
 114
 115 static void context_read_machine_info(Context *c) {
 116         struct stat current_stat = {};
 117         int r;
 118
 119         assert(c);
 120
 121         if (stat("/etc/machine-info", &current_stat) >= 0 &&
 122             stat_inode_unmodified(&c->etc_machine_info_stat, &current_stat))
 123                 return;
 124
 125         context_reset(c,
 126                       (UINT64_C(1) << PROP_PRETTY_HOSTNAME) |
 127                       (UINT64_C(1) << PROP_ICON_NAME) |
 128                       (UINT64_C(1) << PROP_CHASSIS) |
 129                       (UINT64_C(1) << PROP_DEPLOYMENT) |
 130                       (UINT64_C(1) << PROP_LOCATION) |
 131                       (UINT64_C(1) << PROP_HARDWARE_VENDOR) |
 132                       (UINT64_C(1) << PROP_HARDWARE_MODEL));
 133
 134         r = parse_env_file(NULL, "/etc/machine-info",
 135                            "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
 136                            "ICON_NAME", &c->data[PROP_ICON_NAME],
 137                            "CHASSIS", &c->data[PROP_CHASSIS],
 138                            "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
 139                            "LOCATION", &c->data[PROP_LOCATION],
 140                            "HARDWARE_VENDOR", &c->data[PROP_HARDWARE_VENDOR],
 141                            "HARDWARE_MODEL", &c->data[PROP_HARDWARE_MODEL]);
 142         if (r < 0 && r != -ENOENT)
 143                 log_warning_errno(r, "Failed to read /etc/machine-info, ignoring: %m");
 144
 145         c->etc_machine_info_stat = current_stat;
 146 }
 147
 148 static void context_read_os_release(Context *c) {
 149         struct stat current_stat = {};
 150         int r;
 151
 152         assert(c);
 153
 154         if ((stat("/etc/os-release", &current_stat) >= 0 ||
 155              stat("/usr/lib/os-release", &current_stat) >= 0) &&
 156             stat_inode_unmodified(&c->etc_os_release_stat, &current_stat))
 157                 return;
 158
 159         context_reset(c,
 160                       (UINT64_C(1) << PROP_OS_PRETTY_NAME) |
 161                       (UINT64_C(1) << PROP_OS_CPE_NAME) |
 162                       (UINT64_C(1) << PROP_OS_HOME_URL));
 163
 164         r = parse_os_release(NULL,
 165                              "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
 166                              "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
 167                              "HOME_URL", &c->data[PROP_OS_HOME_URL]);
 168         if (r < 0 && r != -ENOENT)
 169                 log_warning_errno(r, "Failed to read os-release file, ignoring: %m");
 170
 171         c->etc_os_release_stat = current_stat;
 172 }
 173
 174 static int get_dmi_data(const char *database_key, const char *regular_key, char **ret) {
 175         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 176         _cleanup_free_ char *b = NULL;
 177         const char *s = NULL;
 178         int r;
 179
 180         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
 181         if (r < 0)
 182                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
 183
 184         if (database_key)
 185                 (void) sd_device_get_property_value(device, database_key, &s);
 186         if (!s && regular_key)
 187                 (void) sd_device_get_property_value(device, regular_key, &s);
 188
 189         if (!ret)
 190                 return !!s;
 191
 192         if (s) {
 193                 b = strdup(s);
 194                 if (!b)
 195                         return -ENOMEM;
 196         }
 197
 198         *ret = TAKE_PTR(b);
 199         return !!s;
 200 }
 201
 202 static int get_hardware_vendor(char **ret) {
 203         return get_dmi_data("ID_VENDOR_FROM_DATABASE", "ID_VENDOR", ret);
 204 }
 205
 206 static int get_hardware_model(char **ret) {
 207         return get_dmi_data("ID_MODEL_FROM_DATABASE", "ID_MODEL", ret);
 208 }
 209
 210 static int get_hardware_firmware_data(const char *sysattr, char **ret) {
 211         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 212         _cleanup_free_ char *b = NULL;
 213         const char *s = NULL;
 214         int r;
 215
 216         assert(sysattr);
 217
 218         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
 219         if (r < 0)
 220                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
 221
 222         (void) sd_device_get_sysattr_value(device, sysattr, &s);
 223         if (!isempty(s)) {
 224                 b = strdup(s);
 225                 if (!b)
 226                         return -ENOMEM;
 227         }
 228
 229         if (ret)
 230                 *ret = TAKE_PTR(b);
 231
 232         return !isempty(s);
 233 }
 234
 235 static int get_hardware_serial(char **ret) {
 236          int r;
 237
 238          r = get_hardware_firmware_data("product_serial", ret);
 239          if (r <= 0)
 240                 return get_hardware_firmware_data("board_serial", ret);
 241
 242          return r;
 243 }
 244
 245 static int get_firmware_version(char **ret) {
 246          return get_hardware_firmware_data("bios_version", ret);
 247 }
 248
 249 static const char* valid_chassis(const char *chassis) {
 250         assert(chassis);
 251
 252         return nulstr_get(
 253                         "vm\0"
 254                         "container\0"
 255                         "desktop\0"
 256                         "laptop\0"
 257                         "convertible\0"
 258                         "server\0"
 259                         "tablet\0"
 260                         "handset\0"
 261                         "watch\0"
 262                         "embedded\0",
 263                         chassis);
 264 }
 265
 266 static bool valid_deployment(const char *deployment) {
 267         assert(deployment);
 268
 269         return in_charset(deployment, VALID_DEPLOYMENT_CHARS);
 270 }
 271
 272 static const char* fallback_chassis(void) {
 273         const char *chassis;
 274         _cleanup_free_ char *type = NULL;
 275         Virtualization v;
 276         unsigned t;
 277         int r;
 278
 279         v = detect_virtualization();
 280         if (v < 0)
 281                 log_debug_errno(v, "Failed to detect virtualization, ignoring: %m");
 282         else if (VIRTUALIZATION_IS_VM(v))
 283                 return "vm";
 284         else if (VIRTUALIZATION_IS_CONTAINER(v))
 285                 return "container";
 286
 287         r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
 288         if (r < 0) {
 289                 log_debug_errno(r, "Failed to read DMI chassis type, ignoring: %m");
 290                 goto try_acpi;
 291         }
 292
 293         r = safe_atou(type, &t);
 294         if (r < 0) {
 295                 log_debug_errno(r, "Failed to parse DMI chassis type \"%s\", ignoring: %m", type);
 296                 goto try_acpi;
 297         }
 298
 299         /* We only list the really obvious cases here. The DMI data is unreliable enough, so let's not do any
 300          * additional guesswork on top of that.
 301          *
 302          * See the SMBIOS Specification 3.5.0 section 7.4.1 for details about the values listed here:
 303          *
 304          * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.5.0.pdf
 305          */
 306
 307         switch (t) {
 308
 309         case 0x03: /* Desktop */
 310         case 0x04: /* Low Profile Desktop */
 311         case 0x06: /* Mini Tower */
 312         case 0x07: /* Tower */
 313         case 0x0D: /* All in one (i.e. PC built into monitor) */
 314         case 0x23: /* Mini PC */
 315         case 0x24: /* Stick PC */
 316                 return "desktop";
 317
 318         case 0x8: /* Portable */
 319         case 0x9: /* Laptop */
 320         case 0xA: /* Notebook */
 321         case 0xE: /* Sub Notebook */
 322                 return "laptop";
 323
 324         case 0xB: /* Hand Held */
 325                 return "handset";
 326
 327         case 0x11: /* Main Server Chassis */
 328         case 0x1C: /* Blade */
 329         case 0x1D: /* Blade Enclosure */
 330                 return "server";
 331
 332         case 0x1E: /* Tablet */
 333                 return "tablet";
 334
 335         case 0x1F: /* Convertible */
 336         case 0x20: /* Detachable */
 337                 return "convertible";
 338
 339         case 0x21: /* IoT Gateway */
 340         case 0x22: /* Embedded PC */
 341                 return "embedded";
 342
 343         default:
 344                 log_debug("Unhandled DMI chassis type 0x%02x, ignoring.", t);
 345         }
 346
 347 try_acpi:
 348         type = mfree(type);
 349         r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);
 350         if (r < 0) {
 351                 log_debug_errno(r, "Failed read ACPI PM profile, ignoring: %m");
 352                 goto try_devicetree;
 353         }
 354
 355         r = safe_atou(type, &t);
 356         if (r < 0) {
 357                 log_debug_errno(r, "Failed parse ACPI PM profile \"%s\", ignoring: %m", type);
 358                 goto try_devicetree;
 359         }
 360
 361         /* We only list the really obvious cases here as the ACPI data is not really super reliable.
 362          *
 363          * See the ACPI 5.0 Spec Section 5.2.9.1 for details:
 364          *
 365          * http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
 366          */
 367
 368         switch (t) {
 369
 370         case 1: /* Desktop */
 371         case 3: /* Workstation */
 372         case 6: /* Appliance PC */
 373                 return "desktop";
 374
 375         case 2: /* Mobile */
 376                 return "laptop";
 377
 378         case 4: /* Enterprise Server */
 379         case 5: /* SOHO Server */
 380         case 7: /* Performance Server */
 381                 return "server";
 382
 383         case 8: /* Tablet */
 384                 return "tablet";
 385
 386         default:
 387                 log_debug("Unhandled ACPI PM profile 0x%02x, ignoring.", t);
 388         }
 389
 390 try_devicetree:
 391         type = mfree(type);
 392         r = read_one_line_file("/proc/device-tree/chassis-type", &type);
 393         if (r < 0) {
 394                 log_debug_errno(r, "Failed to read device-tree chassis type, ignoring: %m");
 395                 return NULL;
 396         }
 397
 398         /* Note that the Devicetree specification uses the very same vocabulary
 399          * of chassis types as we do, hence we do not need to translate these types:
 400          *
 401          * https://github.com/devicetree-org/devicetree-specification/blob/master/source/chapter3-devicenodes.rst */
 402         chassis = valid_chassis(type);
 403         if (!chassis)
 404                 log_debug("Invalid device-tree chassis type \"%s\", ignoring.", type);
 405         return chassis;
 406 }
 407
 408 static char* context_get_chassis(Context *c) {
 409         const char *fallback;
 410         char *dmi;
 411
 412         assert(c);
 413
 414         if (!isempty(c->data[PROP_CHASSIS]))
 415                 return strdup(c->data[PROP_CHASSIS]);
 416
 417         if (get_dmi_data("ID_CHASSIS", NULL, &dmi) > 0)
 418                 return dmi;
 419
 420         fallback = fallback_chassis();
 421         if (fallback)
 422                 return strdup(fallback);
 423
 424         return NULL;
 425 }
 426
 427 static char* context_fallback_icon_name(Context *c) {
 428         _cleanup_free_ char *chassis = NULL;
 429
 430         assert(c);
 431
 432         chassis = context_get_chassis(c);
 433         if (chassis)
 434                 return strjoin("computer-", chassis);
 435
 436         return strdup("computer");
 437 }
 438
 439 static int context_update_kernel_hostname(
 440                 Context *c,
 441                 const char *transient_hn) {
 442
 443         _cleanup_free_ char *_hn_free = NULL;
 444         const char *hn;
 445         HostnameSource hns;
 446         int r;
 447
 448         assert(c);
 449
 450         /* /etc/hostname has the highest preference ... */
 451         if (c->data[PROP_STATIC_HOSTNAME]) {
 452                 hn = c->data[PROP_STATIC_HOSTNAME];
 453                 hns = HOSTNAME_STATIC;
 454
 455         /* ... the transient hostname, (ie: DHCP) comes next ... */
 456         } else if (transient_hn) {
 457                 hn = transient_hn;
 458                 hns = HOSTNAME_TRANSIENT;
 459
 460         /* ... and the ultimate fallback */
 461         } else {
 462                 hn = _hn_free = get_default_hostname();
 463                 if (!hn)
 464                         return log_oom();
 465
 466                 hns = HOSTNAME_DEFAULT;
 467         }
 468
 469         r = sethostname_idempotent(hn);
 470         if (r < 0)
 471                 return log_error_errno(r, "Failed to set hostname: %m");
 472
 473         if (c->hostname_source != hns) {
 474                 c->hostname_source = hns;
 475                 r = 1;
 476         }
 477
 478         (void) nscd_flush_cache(STRV_MAKE("hosts"));
 479
 480         if (r == 0)
 481                 log_debug("Hostname was already set to <%s>.", hn);
 482         else {
 483                 log_info("Hostname set to <%s> (%s)", hn, hostname_source_to_string(hns));
 484
 485                 hostname_update_source_hint(hn, hns);
 486         }
 487
 488         return r; /* 0 if no change, 1 if something was done  */
 489 }
 490
 491 static void unset_statp(struct stat **p) {
 492         if (!*p)
 493                 return;
 494
 495         **p = (struct stat) {};
 496 }
 497
 498 static int context_write_data_static_hostname(Context *c) {
 499         _cleanup_(unset_statp) struct stat *s = NULL;
 500         int r;
 501
 502         assert(c);
 503
 504         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 505          * already, even if we can't make it hit the disk. */
 506         s = &c->etc_hostname_stat;
 507
 508         if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
 509                 if (unlink("/etc/hostname") < 0 && errno != ENOENT)
 510                         return -errno;
 511
 512                 TAKE_PTR(s);
 513                 return 0;
 514         }
 515
 516         r = write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
 517         if (r < 0)
 518                 return r;
 519
 520         TAKE_PTR(s);
 521         return 0;
 522 }
 523
 524 static int context_write_data_machine_info(Context *c) {
 525         _cleanup_(unset_statp) struct stat *s = NULL;
 526         static const char * const name[_PROP_MAX] = {
 527                 [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
 528                 [PROP_ICON_NAME] = "ICON_NAME",
 529                 [PROP_CHASSIS] = "CHASSIS",
 530                 [PROP_DEPLOYMENT] = "DEPLOYMENT",
 531                 [PROP_LOCATION] = "LOCATION",
 532         };
 533         _cleanup_strv_free_ char **l = NULL;
 534         int r;
 535
 536         assert(c);
 537
 538         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 539          * already, even if we can't make it hit the disk. */
 540         s = &c->etc_machine_info_stat;
 541
 542         r = load_env_file(NULL, "/etc/machine-info", &l);
 543         if (r < 0 && r != -ENOENT)
 544                 return r;
 545
 546         for (int p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
 547                 assert(name[p]);
 548
 549                 r = strv_env_assign(&l, name[p], empty_to_null(c->data[p]));
 550                 if (r < 0)
 551                         return r;
 552         }
 553
 554         if (strv_isempty(l)) {
 555                 if (unlink("/etc/machine-info") < 0 && errno != ENOENT)
 556                         return -errno;
 557
 558                 TAKE_PTR(s);
 559                 return 0;
 560         }
 561
 562         r = write_env_file_label("/etc/machine-info", l);
 563         if (r < 0)
 564                 return r;
 565
 566         TAKE_PTR(s);
 567         return 0;
 568 }
 569
 570 static int property_get_hardware_property(
 571                 sd_bus_message *reply,
 572                 Context *c,
 573                 HostProperty prop,
 574                 int (*getter)(char **)) {
 575
 576         _cleanup_free_ char *from_dmi = NULL;
 577
 578         assert(reply);
 579         assert(c);
 580         assert(IN_SET(prop, PROP_HARDWARE_VENDOR, PROP_HARDWARE_MODEL));
 581         assert(getter);
 582
 583         context_read_machine_info(c);
 584
 585         if (isempty(c->data[prop]))
 586                 (void) getter(&from_dmi);
 587
 588         return sd_bus_message_append(reply, "s", from_dmi ?: c->data[prop]);
 589 }
 590
 591 static int property_get_hardware_vendor(
 592                 sd_bus *bus,
 593                 const char *path,
 594                 const char *interface,
 595                 const char *property,
 596                 sd_bus_message *reply,
 597                 void *userdata,
 598                 sd_bus_error *error) {
 599
 600         return property_get_hardware_property(reply, userdata, PROP_HARDWARE_VENDOR, get_hardware_vendor);
 601 }
 602
 603 static int property_get_hardware_model(
 604                 sd_bus *bus,
 605                 const char *path,
 606                 const char *interface,
 607                 const char *property,
 608                 sd_bus_message *reply,
 609                 void *userdata,
 610                 sd_bus_error *error) {
 611
 612         return property_get_hardware_property(reply, userdata, PROP_HARDWARE_MODEL, get_hardware_model);
 613 }
 614
 615 static int property_get_firmware_version(
 616                 sd_bus *bus,
 617                 const char *path,
 618                 const char *interface,
 619                 const char *property,
 620                 sd_bus_message *reply,
 621                 void *userdata,
 622                 sd_bus_error *error) {
 623
 624         _cleanup_free_ char *firmware_version = NULL;
 625
 626         (void) get_firmware_version(&firmware_version);
 627
 628         return sd_bus_message_append(reply, "s", firmware_version);
 629 }
 630
 631 static int property_get_hostname(
 632                 sd_bus *bus,
 633                 const char *path,
 634                 const char *interface,
 635                 const char *property,
 636                 sd_bus_message *reply,
 637                 void *userdata,
 638                 sd_bus_error *error) {
 639
 640         _cleanup_free_ char *hn = NULL;
 641         int r;
 642
 643         r = gethostname_strict(&hn);
 644         if (r < 0) {
 645                 if (r != -ENXIO)
 646                         return r;
 647
 648                 hn = get_default_hostname();
 649                 if (!hn)
 650                         return -ENOMEM;
 651         }
 652
 653         return sd_bus_message_append(reply, "s", hn);
 654 }
 655
 656 static int property_get_static_hostname(
 657                 sd_bus *bus,
 658                 const char *path,
 659                 const char *interface,
 660                 const char *property,
 661                 sd_bus_message *reply,
 662                 void *userdata,
 663                 sd_bus_error *error) {
 664
 665         Context *c = ASSERT_PTR(userdata);
 666
 667         context_read_etc_hostname(c);
 668
 669         return sd_bus_message_append(reply, "s", c->data[PROP_STATIC_HOSTNAME]);
 670 }
 671
 672 static int property_get_default_hostname(
 673                 sd_bus *bus,
 674                 const char *path,
 675                 const char *interface,
 676                 const char *property,
 677                 sd_bus_message *reply,
 678                 void *userdata,
 679                 sd_bus_error *error) {
 680
 681         _cleanup_free_ char *hn = NULL;
 682
 683         hn = get_default_hostname();
 684         if (!hn)
 685                 return log_oom();
 686
 687         return sd_bus_message_append(reply, "s", hn);
 688 }
 689
 690 static void context_determine_hostname_source(Context *c) {
 691         _cleanup_free_ char *hostname = NULL;
 692         int r;
 693
 694         assert(c);
 695
 696         if (c->hostname_source >= 0)
 697                 return;
 698
 699         (void) gethostname_full(GET_HOSTNAME_ALLOW_LOCALHOST, &hostname);
 700
 701         if (streq_ptr(hostname, c->data[PROP_STATIC_HOSTNAME]))
 702                 c->hostname_source = HOSTNAME_STATIC;
 703         else {
 704                 _cleanup_free_ char *fallback = NULL;
 705
 706                 /* If the hostname was not set by us, try to figure out where it came from. If we set it to
 707                  * the default hostname, the file will tell us. We compare the string because it is possible
 708                  * that the hostname was set by an older version that had a different fallback, in the initrd
 709                  * or before we reexecuted. */
 710
 711                 r = read_one_line_file("/run/systemd/default-hostname", &fallback);
 712                 if (r < 0 && r != -ENOENT)
 713                         log_warning_errno(r, "Failed to read /run/systemd/default-hostname, ignoring: %m");
 714
 715                 if (streq_ptr(fallback, hostname))
 716                         c->hostname_source = HOSTNAME_DEFAULT;
 717                 else
 718                         c->hostname_source = HOSTNAME_TRANSIENT;
 719         }
 720 }
 721
 722 static int property_get_hostname_source(
 723                 sd_bus *bus,
 724                 const char *path,
 725                 const char *interface,
 726                 const char *property,
 727                 sd_bus_message *reply,
 728                 void *userdata,
 729                 sd_bus_error *error) {
 730
 731         Context *c = ASSERT_PTR(userdata);
 732
 733         context_read_etc_hostname(c);
 734         context_determine_hostname_source(c);
 735
 736         return sd_bus_message_append(reply, "s", hostname_source_to_string(c->hostname_source));
 737 }
 738
 739 static int property_get_machine_info_field(
 740                 sd_bus *bus,
 741                 const char *path,
 742                 const char *interface,
 743                 const char *property,
 744                 sd_bus_message *reply,
 745                 void *userdata,
 746                 sd_bus_error *error) {
 747
 748         sd_bus_slot *slot;
 749         Context *c;
 750
 751         /* Acquire the context object without this property's userdata offset added. Explanation: we want
 752          * access to two pointers here: a) the main context object we cache all properties in, and b) the
 753          * pointer to the property field inside the context object that we are supposed to update and
 754          * use. The latter (b) we get in the 'userdata' function parameter, and sd-bus calculates that for us
 755          * from the 'userdata' pointer we supplied when the vtable was registered, with the offset we
 756          * specified in the vtable added on top. To get the former (a) we need the 'userdata' pointer from
 757          * the vtable registration directly, without the offset added. Hence we ask sd-bus what the slot
 758          * object is (which encapsulates the vtable registration), and then query the 'userdata' field
 759          * directly off it. */
 760         assert_se(slot = sd_bus_get_current_slot(bus));
 761         assert_se(c = sd_bus_slot_get_userdata(slot));
 762
 763         context_read_machine_info(c);
 764
 765         return sd_bus_message_append(reply, "s", *(char**) userdata);
 766 }
 767
 768 static int property_get_os_release_field(
 769                 sd_bus *bus,
 770                 const char *path,
 771                 const char *interface,
 772                 const char *property,
 773                 sd_bus_message *reply,
 774                 void *userdata,
 775                 sd_bus_error *error) {
 776
 777         sd_bus_slot *slot;
 778         Context *c;
 779
 780         /* As above, acquire the current context without this property's userdata offset added. */
 781         assert_se(slot = sd_bus_get_current_slot(bus));
 782         assert_se(c = sd_bus_slot_get_userdata(slot));
 783
 784         context_read_os_release(c);
 785
 786         return sd_bus_message_append(reply, "s", *(char**) userdata);
 787 }
 788
 789 static int property_get_icon_name(
 790                 sd_bus *bus,
 791                 const char *path,
 792                 const char *interface,
 793                 const char *property,
 794                 sd_bus_message *reply,
 795                 void *userdata,
 796                 sd_bus_error *error) {
 797
 798         _cleanup_free_ char *n = NULL;
 799         Context *c = userdata;
 800         const char *name;
 801
 802         context_read_machine_info(c);
 803
 804         if (isempty(c->data[PROP_ICON_NAME]))
 805                 name = n = context_fallback_icon_name(c);
 806         else
 807                 name = c->data[PROP_ICON_NAME];
 808
 809         if (!name)
 810                 return -ENOMEM;
 811
 812         return sd_bus_message_append(reply, "s", name);
 813 }
 814
 815 static int property_get_chassis(
 816                 sd_bus *bus,
 817                 const char *path,
 818                 const char *interface,
 819                 const char *property,
 820                 sd_bus_message *reply,
 821                 void *userdata,
 822                 sd_bus_error *error) {
 823
 824         _cleanup_free_ char *chassis = NULL;
 825         Context *c = userdata;
 826
 827         context_read_machine_info(c);
 828
 829         chassis = context_get_chassis(c);
 830
 831         return sd_bus_message_append(reply, "s", chassis);
 832 }
 833
 834 static int property_get_uname_field(
 835                 sd_bus *bus,
 836                 const char *path,
 837                 const char *interface,
 838                 const char *property,
 839                 sd_bus_message *reply,
 840                 void *userdata,
 841                 sd_bus_error *error) {
 842
 843         struct utsname u;
 844
 845         assert_se(uname(&u) >= 0);
 846
 847         return sd_bus_message_append(reply, "s", (char*) &u + PTR_TO_SIZE(userdata));
 848 }
 849
 850 static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 851         Context *c = ASSERT_PTR(userdata);
 852         const char *name;
 853         int interactive, r;
 854
 855         assert(m);
 856
 857         r = sd_bus_message_read(m, "sb", &name, &interactive);
 858         if (r < 0)
 859                 return r;
 860
 861         name = empty_to_null(name);
 862
 863         /* We always go through with the procedure below without comparing to the current hostname, because
 864          * we might want to adjust hostname source information even if the actual hostname is unchanged. */
 865
 866         if (name && !hostname_is_valid(name, 0))
 867                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
 868
 869         context_read_etc_hostname(c);
 870
 871         r = bus_verify_polkit_async(
 872                         m,
 873                         CAP_SYS_ADMIN,
 874                         "org.freedesktop.hostname1.set-hostname",
 875                         NULL,
 876                         interactive,
 877                         UID_INVALID,
 878                         &c->polkit_registry,
 879                         error);
 880         if (r < 0)
 881                 return r;
 882         if (r == 0)
 883                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 884
 885         r = context_update_kernel_hostname(c, name);
 886         if (r < 0)
 887                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 888         else if (r > 0)
 889                 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 890                                                       "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 891                                                       "Hostname", "HostnameSource", NULL);
 892
 893         return sd_bus_reply_method_return(m, NULL);
 894 }
 895
 896 static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 897         Context *c = ASSERT_PTR(userdata);
 898         const char *name;
 899         int interactive;
 900         int r;
 901
 902         assert(m);
 903
 904         r = sd_bus_message_read(m, "sb", &name, &interactive);
 905         if (r < 0)
 906                 return r;
 907
 908         name = empty_to_null(name);
 909
 910         context_read_etc_hostname(c);
 911
 912         if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
 913                 return sd_bus_reply_method_return(m, NULL);
 914
 915         if (name && !hostname_is_valid(name, 0))
 916                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
 917
 918         r = bus_verify_polkit_async(
 919                         m,
 920                         CAP_SYS_ADMIN,
 921                         "org.freedesktop.hostname1.set-static-hostname",
 922                         NULL,
 923                         interactive,
 924                         UID_INVALID,
 925                         &c->polkit_registry,
 926                         error);
 927         if (r < 0)
 928                 return r;
 929         if (r == 0)
 930                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 931
 932         r = free_and_strdup_warn(&c->data[PROP_STATIC_HOSTNAME], name);
 933         if (r < 0)
 934                 return r;
 935
 936         r = context_write_data_static_hostname(c);
 937         if (r < 0) {
 938                 log_error_errno(r, "Failed to write static hostname: %m");
 939                 if (ERRNO_IS_PRIVILEGE(r))
 940                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/hostname.");
 941                 if (r == -EROFS)
 942                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/hostname is in a read-only filesystem.");
 943                 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %m");
 944         }
 945
 946         r = context_update_kernel_hostname(c, NULL);
 947         if (r < 0) {
 948                 log_error_errno(r, "Failed to set hostname: %m");
 949                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 950         }
 951
 952         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 953                                               "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 954                                               "StaticHostname", "Hostname", "HostnameSource", NULL);
 955
 956         return sd_bus_reply_method_return(m, NULL);
 957 }
 958
 959 static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
 960         int interactive;
 961         const char *name;
 962         int r;
 963
 964         assert(c);
 965         assert(m);
 966
 967         r = sd_bus_message_read(m, "sb", &name, &interactive);
 968         if (r < 0)
 969                 return r;
 970
 971         name = empty_to_null(name);
 972
 973         context_read_machine_info(c);
 974
 975         if (streq_ptr(name, c->data[prop]))
 976                 return sd_bus_reply_method_return(m, NULL);
 977
 978         if (!isempty(name)) {
 979                 /* The icon name might ultimately be used as file
 980                  * name, so better be safe than sorry */
 981
 982                 if (prop == PROP_ICON_NAME && !filename_is_valid(name))
 983                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
 984                 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
 985                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty hostname '%s'", name);
 986                 if (prop == PROP_CHASSIS && !valid_chassis(name))
 987                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
 988                 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
 989                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
 990                 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
 991                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
 992         }
 993
 994         /* Since the pretty hostname should always be changed at the
 995          * same time as the static one, use the same policy action for
 996          * both... */
 997
 998         r = bus_verify_polkit_async(
 999                         m,
1000                         CAP_SYS_ADMIN,
1001                         prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
1002                         NULL,
1003                         interactive,
1004                         UID_INVALID,
1005                         &c->polkit_registry,
1006                         error);
1007         if (r < 0)
1008                 return r;
1009         if (r == 0)
1010                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1011
1012         r = free_and_strdup_warn(&c->data[prop], name);
1013         if (r < 0)
1014                 return r;
1015
1016         r = context_write_data_machine_info(c);
1017         if (r < 0) {
1018                 log_error_errno(r, "Failed to write machine info: %m");
1019                 if (ERRNO_IS_PRIVILEGE(r))
1020                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/machine-info.");
1021                 if (r == -EROFS)
1022                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/machine-info is in a read-only filesystem.");
1023                 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %m");
1024         }
1025
1026         log_info("Changed %s to '%s'",
1027                  prop == PROP_PRETTY_HOSTNAME ? "pretty hostname" :
1028                  prop == PROP_DEPLOYMENT ? "deployment" :
1029                  prop == PROP_LOCATION ? "location" :
1030                  prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
1031
1032         (void) sd_bus_emit_properties_changed(
1033                         sd_bus_message_get_bus(m),
1034                         "/org/freedesktop/hostname1",
1035                         "org.freedesktop.hostname1",
1036                         prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
1037                         prop == PROP_DEPLOYMENT ? "Deployment" :
1038                         prop == PROP_LOCATION ? "Location" :
1039                         prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
1040
1041         return sd_bus_reply_method_return(m, NULL);
1042 }
1043
1044 static int method_set_pretty_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1045         return set_machine_info(userdata, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
1046 }
1047
1048 static int method_set_icon_name(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1049         return set_machine_info(userdata, m, PROP_ICON_NAME, method_set_icon_name, error);
1050 }
1051
1052 static int method_set_chassis(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1053         return set_machine_info(userdata, m, PROP_CHASSIS, method_set_chassis, error);
1054 }
1055
1056 static int method_set_deployment(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1057         return set_machine_info(userdata, m, PROP_DEPLOYMENT, method_set_deployment, error);
1058 }
1059
1060 static int method_set_location(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1061         return set_machine_info(userdata, m, PROP_LOCATION, method_set_location, error);
1062 }
1063
1064 static int method_get_product_uuid(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1065         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1066         Context *c = ASSERT_PTR(userdata);
1067         int interactive, r;
1068         sd_id128_t uuid;
1069
1070         assert(m);
1071
1072         r = sd_bus_message_read(m, "b", &interactive);
1073         if (r < 0)
1074                 return r;
1075
1076         r = bus_verify_polkit_async(
1077                         m,
1078                         CAP_SYS_ADMIN,
1079                         "org.freedesktop.hostname1.get-product-uuid",
1080                         NULL,
1081                         interactive,
1082                         UID_INVALID,
1083                         &c->polkit_registry,
1084                         error);
1085         if (r < 0)
1086                 return r;
1087         if (r == 0)
1088                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1089
1090         r = id128_get_product(&uuid);
1091         if (r < 0) {
1092                 if (r == -EADDRNOTAVAIL)
1093                         log_debug_errno(r, "DMI product UUID is all 0x00 or all 0xFF, ignoring.");
1094                 else
1095                         log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
1096                                        "Failed to read product UUID, ignoring: %m");
1097
1098                 return sd_bus_error_set(error, BUS_ERROR_NO_PRODUCT_UUID,
1099                                         "Failed to read product UUID from firmware.");
1100         }
1101
1102         r = sd_bus_message_new_method_return(m, &reply);
1103         if (r < 0)
1104                 return r;
1105
1106         r = sd_bus_message_append_array(reply, 'y', uuid.bytes, sizeof(uuid.bytes));
1107         if (r < 0)
1108                 return r;
1109
1110         return sd_bus_send(NULL, reply, NULL);
1111 }
1112
1113 static int method_get_hardware_serial(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1114         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1115         _cleanup_free_ char *serial = NULL;
1116         Context *c = ASSERT_PTR(userdata);
1117         int r;
1118
1119         assert(m);
1120
1121         r = bus_verify_polkit_async(
1122                         m,
1123                         CAP_SYS_ADMIN,
1124                         "org.freedesktop.hostname1.get-hardware-serial",
1125                         NULL,
1126                         false,
1127                         UID_INVALID,
1128                         &c->polkit_registry,
1129                         error);
1130         if (r < 0)
1131                 return r;
1132         if (r == 0)
1133                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1134
1135         r = get_hardware_serial(&serial);
1136         if (r < 0)
1137                 return r;
1138
1139         r = sd_bus_message_new_method_return(m, &reply);
1140         if (r < 0)
1141                 return r;
1142
1143         r = sd_bus_message_append(reply, "s", serial);
1144         if (r < 0)
1145                 return r;
1146
1147         return sd_bus_send(NULL, reply, NULL);
1148 }
1149
1150 static int method_describe(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1151         _cleanup_free_ char *hn = NULL, *dhn = NULL, *in = NULL, *text = NULL,
1152                 *chassis = NULL, *vendor = NULL, *model = NULL, *serial = NULL, *firmware_version = NULL;
1153         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1154         _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
1155         sd_id128_t product_uuid = SD_ID128_NULL;
1156         Context *c = ASSERT_PTR(userdata);
1157         bool privileged;
1158         struct utsname u;
1159         int r;
1160
1161         assert(m);
1162
1163         r = bus_verify_polkit_async(
1164                         m,
1165                         CAP_SYS_ADMIN,
1166                         "org.freedesktop.hostname1.get-description",
1167                         NULL,
1168                         false,
1169                         UID_INVALID,
1170                         &c->polkit_registry,
1171                         NULL);
1172         if (r == 0)
1173                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1174
1175         /* We ignore all authentication errors here, since most data is unprivileged, the one exception being
1176          * the product ID which we'll check explicitly. */
1177         privileged = r > 0;
1178
1179         context_read_etc_hostname(c);
1180         context_read_machine_info(c);
1181         context_read_os_release(c);
1182         context_determine_hostname_source(c);
1183
1184         r = gethostname_strict(&hn);
1185         if (r < 0) {
1186                 if (r != -ENXIO)
1187                         return log_error_errno(r, "Failed to read local host name: %m");
1188
1189                 hn = get_default_hostname();
1190                 if (!hn)
1191                         return log_oom();
1192         }
1193
1194         dhn = get_default_hostname();
1195         if (!dhn)
1196                 return log_oom();
1197
1198         if (isempty(c->data[PROP_ICON_NAME]))
1199                 in = context_fallback_icon_name(c);
1200
1201         chassis = context_get_chassis(c);
1202
1203         assert_se(uname(&u) >= 0);
1204
1205         if (isempty(c->data[PROP_HARDWARE_VENDOR]))
1206                 (void) get_hardware_vendor(&vendor);
1207         if (isempty(c->data[PROP_HARDWARE_MODEL]))
1208                 (void) get_hardware_model(&model);
1209
1210         if (privileged) {
1211                 /* The product UUID and hardware serial is only available to privileged clients */
1212                 (void) id128_get_product(&product_uuid);
1213                 (void) get_hardware_serial(&serial);
1214         }
1215         (void) get_firmware_version(&firmware_version);
1216
1217         r = json_build(&v, JSON_BUILD_OBJECT(
1218                                        JSON_BUILD_PAIR("Hostname", JSON_BUILD_STRING(hn)),
1219                                        JSON_BUILD_PAIR("StaticHostname", JSON_BUILD_STRING(c->data[PROP_STATIC_HOSTNAME])),
1220                                        JSON_BUILD_PAIR("PrettyHostname", JSON_BUILD_STRING(c->data[PROP_PRETTY_HOSTNAME])),
1221                                        JSON_BUILD_PAIR("DefaultHostname", JSON_BUILD_STRING(dhn)),
1222                                        JSON_BUILD_PAIR("HostnameSource", JSON_BUILD_STRING(hostname_source_to_string(c->hostname_source))),
1223                                        JSON_BUILD_PAIR("IconName", JSON_BUILD_STRING(in ?: c->data[PROP_ICON_NAME])),
1224                                        JSON_BUILD_PAIR("Chassis", JSON_BUILD_STRING(chassis)),
1225                                        JSON_BUILD_PAIR("Deployment", JSON_BUILD_STRING(c->data[PROP_DEPLOYMENT])),
1226                                        JSON_BUILD_PAIR("Location", JSON_BUILD_STRING(c->data[PROP_LOCATION])),
1227                                        JSON_BUILD_PAIR("KernelName", JSON_BUILD_STRING(u.sysname)),
1228                                        JSON_BUILD_PAIR("KernelRelease", JSON_BUILD_STRING(u.release)),
1229                                        JSON_BUILD_PAIR("KernelVersion", JSON_BUILD_STRING(u.version)),
1230                                        JSON_BUILD_PAIR("OperatingSystemPrettyName", JSON_BUILD_STRING(c->data[PROP_OS_PRETTY_NAME])),
1231                                        JSON_BUILD_PAIR("OperatingSystemCPEName", JSON_BUILD_STRING(c->data[PROP_OS_CPE_NAME])),
1232                                        JSON_BUILD_PAIR("OperatingSystemHomeURL", JSON_BUILD_STRING(c->data[PROP_OS_HOME_URL])),
1233                                        JSON_BUILD_PAIR("HardwareVendor", JSON_BUILD_STRING(vendor ?: c->data[PROP_HARDWARE_VENDOR])),
1234                                        JSON_BUILD_PAIR("HardwareModel", JSON_BUILD_STRING(model ?: c->data[PROP_HARDWARE_MODEL])),
1235                                        JSON_BUILD_PAIR("HardwareSerial", JSON_BUILD_STRING(serial)),
1236                                        JSON_BUILD_PAIR("FirmwareVersion", JSON_BUILD_STRING(firmware_version)),
1237                                        JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_ID128(product_uuid)),
1238                                        JSON_BUILD_PAIR_CONDITION(sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_NULL)));
1239
1240         if (r < 0)
1241                 return log_error_errno(r, "Failed to build JSON data: %m");
1242
1243         r = json_variant_format(v, 0, &text);
1244         if (r < 0)
1245                 return log_error_errno(r, "Failed to format JSON data: %m");
1246
1247         r = sd_bus_message_new_method_return(m, &reply);
1248         if (r < 0)
1249                 return r;
1250
1251         r = sd_bus_message_append(reply, "s", text);
1252         if (r < 0)
1253                 return r;
1254
1255         return sd_bus_send(NULL, reply, NULL);
1256 }
1257
1258 static const sd_bus_vtable hostname_vtable[] = {
1259         SD_BUS_VTABLE_START(0),
1260         SD_BUS_PROPERTY("Hostname", "s", property_get_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1261         SD_BUS_PROPERTY("StaticHostname", "s", property_get_static_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1262         SD_BUS_PROPERTY("PrettyHostname", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1263         SD_BUS_PROPERTY("DefaultHostname", "s", property_get_default_hostname, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1264         SD_BUS_PROPERTY("HostnameSource", "s", property_get_hostname_source, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1265         SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1266         SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1267         SD_BUS_PROPERTY("Deployment", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1268         SD_BUS_PROPERTY("Location", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1269         SD_BUS_PROPERTY("KernelName", "s", property_get_uname_field, offsetof(struct utsname, sysname), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1270         SD_BUS_PROPERTY("KernelRelease", "s", property_get_uname_field, offsetof(struct utsname, release), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1271         SD_BUS_PROPERTY("KernelVersion", "s", property_get_uname_field, offsetof(struct utsname, version), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1272         SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1273         SD_BUS_PROPERTY("OperatingSystemCPEName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1274         SD_BUS_PROPERTY("HomeURL", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_HOME_URL, SD_BUS_VTABLE_PROPERTY_CONST),
1275         SD_BUS_PROPERTY("HardwareVendor", "s", property_get_hardware_vendor, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1276         SD_BUS_PROPERTY("HardwareModel", "s", property_get_hardware_model, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1277         SD_BUS_PROPERTY("FirmwareVersion", "s", property_get_firmware_version, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1278
1279         SD_BUS_METHOD_WITH_ARGS("SetHostname",
1280                                 SD_BUS_ARGS("s", hostname, "b", interactive),
1281                                 SD_BUS_NO_RESULT,
1282                                 method_set_hostname,
1283                                 SD_BUS_VTABLE_UNPRIVILEGED),
1284         SD_BUS_METHOD_WITH_ARGS("SetStaticHostname",
1285                                 SD_BUS_ARGS("s", hostname, "b", interactive),
1286                                 SD_BUS_NO_RESULT,
1287                                 method_set_static_hostname,
1288                                 SD_BUS_VTABLE_UNPRIVILEGED),
1289         SD_BUS_METHOD_WITH_ARGS("SetPrettyHostname",
1290                                 SD_BUS_ARGS("s", hostname, "b", interactive),
1291                                 SD_BUS_NO_RESULT,
1292                                 method_set_pretty_hostname,
1293                                 SD_BUS_VTABLE_UNPRIVILEGED),
1294         SD_BUS_METHOD_WITH_ARGS("SetIconName",
1295                                 SD_BUS_ARGS("s", icon, "b", interactive),
1296                                 SD_BUS_NO_RESULT,
1297                                 method_set_icon_name,
1298                                 SD_BUS_VTABLE_UNPRIVILEGED),
1299         SD_BUS_METHOD_WITH_ARGS("SetChassis",
1300                                 SD_BUS_ARGS("s", chassis, "b", interactive),
1301                                 SD_BUS_NO_RESULT,
1302                                 method_set_chassis,
1303                                 SD_BUS_VTABLE_UNPRIVILEGED),
1304         SD_BUS_METHOD_WITH_ARGS("SetDeployment",
1305                                 SD_BUS_ARGS("s", deployment, "b", interactive),
1306                                 SD_BUS_NO_RESULT,
1307                                 method_set_deployment,
1308                                 SD_BUS_VTABLE_UNPRIVILEGED),
1309         SD_BUS_METHOD_WITH_ARGS("SetLocation",
1310                                 SD_BUS_ARGS("s", location, "b", interactive),
1311                                 SD_BUS_NO_RESULT,
1312                                 method_set_location,
1313                                 SD_BUS_VTABLE_UNPRIVILEGED),
1314         SD_BUS_METHOD_WITH_ARGS("GetProductUUID",
1315                                 SD_BUS_ARGS("b", interactive),
1316                                 SD_BUS_RESULT("ay", uuid),
1317                                 method_get_product_uuid,
1318                                 SD_BUS_VTABLE_UNPRIVILEGED),
1319         SD_BUS_METHOD_WITH_ARGS("GetHardwareSerial",
1320                                 SD_BUS_NO_ARGS,
1321                                 SD_BUS_RESULT("s", serial),
1322                                 method_get_hardware_serial,
1323                                 SD_BUS_VTABLE_UNPRIVILEGED),
1324         SD_BUS_METHOD_WITH_ARGS("Describe",
1325                                 SD_BUS_NO_ARGS,
1326                                 SD_BUS_RESULT("s", json),
1327                                 method_describe,
1328                                 SD_BUS_VTABLE_UNPRIVILEGED),
1329
1330         SD_BUS_VTABLE_END,
1331 };
1332
1333 static const BusObjectImplementation manager_object = {
1334         "/org/freedesktop/hostname1",
1335         "org.freedesktop.hostname1",
1336         .vtables = BUS_VTABLES(hostname_vtable),
1337 };
1338
1339 static int connect_bus(Context *c, sd_event *event, sd_bus **ret) {
1340         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1341         int r;
1342
1343         assert(c);
1344         assert(event);
1345         assert(ret);
1346
1347         r = sd_bus_default_system(&bus);
1348         if (r < 0)
1349                 return log_error_errno(r, "Failed to get system bus connection: %m");
1350
1351         r = bus_add_implementation(bus, &manager_object, c);
1352         if (r < 0)
1353                 return r;
1354
1355         r = bus_log_control_api_register(bus);
1356         if (r < 0)
1357                 return r;
1358
1359         r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.hostname1", 0, NULL, NULL);
1360         if (r < 0)
1361                 return log_error_errno(r, "Failed to request name: %m");
1362
1363         r = sd_bus_attach_event(bus, event, 0);
1364         if (r < 0)
1365                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
1366
1367         *ret = TAKE_PTR(bus);
1368         return 0;
1369 }
1370
1371 static int run(int argc, char *argv[]) {
1372         _cleanup_(context_destroy) Context context = {
1373                 .hostname_source = _HOSTNAME_INVALID, /* appropriate value will be set later */
1374         };
1375         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
1376         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1377         int r;
1378
1379         log_setup();
1380
1381         r = service_parse_argv("systemd-hostnamed.service",
1382                                "Manage the system hostname and related metadata.",
1383                                BUS_IMPLEMENTATIONS(&manager_object,
1384                                                    &log_control_object),
1385                                argc, argv);
1386         if (r <= 0)
1387                 return r;
1388
1389         umask(0022);
1390
1391         r = mac_selinux_init();
1392         if (r < 0)
1393                 return r;
1394
1395         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
1396
1397         r = sd_event_default(&event);
1398         if (r < 0)
1399                 return log_error_errno(r, "Failed to allocate event loop: %m");
1400
1401         (void) sd_event_set_watchdog(event, true);
1402
1403         r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
1404         if (r < 0)
1405                 return log_error_errno(r, "Failed to install SIGINT handler: %m");
1406
1407         r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
1408         if (r < 0)
1409                 return log_error_errno(r, "Failed to install SIGTERM handler: %m");
1410
1411         r = connect_bus(&context, event, &bus);
1412         if (r < 0)
1413                 return r;
1414
1415         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
1416         if (r < 0)
1417                 return log_error_errno(r, "Failed to run event loop: %m");
1418
1419         return 0;
1420 }
1421
1422 DEFINE_MAIN_FUNCTION(run);