src/hostname/hostnamed.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <errno.h>
   4 #include <sys/utsname.h>
   5 #include <sys/stat.h>
   6 #include <sys/types.h>
   7 #include <unistd.h>
   8
   9 #include "alloc-util.h"
  10 #include "bus-common-errors.h"
  11 #include "bus-get-properties.h"
  12 #include "bus-log-control-api.h"
  13 #include "bus-polkit.h"
  14 #include "def.h"
  15 #include "env-file-label.h"
  16 #include "env-file.h"
  17 #include "env-util.h"
  18 #include "fileio-label.h"
  19 #include "fileio.h"
  20 #include "hostname-setup.h"
  21 #include "hostname-util.h"
  22 #include "id128-util.h"
  23 #include "json.h"
  24 #include "main-func.h"
  25 #include "missing_capability.h"
  26 #include "nscd-flush.h"
  27 #include "nulstr-util.h"
  28 #include "os-util.h"
  29 #include "parse-util.h"
  30 #include "path-util.h"
  31 #include "sd-device.h"
  32 #include "selinux-util.h"
  33 #include "service-util.h"
  34 #include "signal-util.h"
  35 #include "stat-util.h"
  36 #include "string-table.h"
  37 #include "strv.h"
  38 #include "user-util.h"
  39 #include "util.h"
  40 #include "virt.h"
  41
  42 #define VALID_DEPLOYMENT_CHARS (DIGITS LETTERS "-.:")
  43
  44 /* Properties we cache are indexed by an enum, to make invalidation easy and systematic (as we can iterate
  45  * through them all, and they are uniformly strings). */
  46 typedef enum {
  47         /* Read from /etc/hostname */
  48         PROP_STATIC_HOSTNAME,
  49
  50         /* Read from /etc/machine-info */
  51         PROP_PRETTY_HOSTNAME,
  52         PROP_ICON_NAME,
  53         PROP_CHASSIS,
  54         PROP_DEPLOYMENT,
  55         PROP_LOCATION,
  56         PROP_VENDOR,
  57         PROP_MODEL,
  58
  59         /* Read from /etc/os-release (or /usr/lib/os-release) */
  60         PROP_OS_PRETTY_NAME,
  61         PROP_OS_CPE_NAME,
  62         PROP_OS_HOME_URL,
  63         _PROP_MAX,
  64         _PROP_INVALID = -EINVAL,
  65 } HostProperty;
  66
  67 typedef struct Context {
  68         char *data[_PROP_MAX];
  69
  70         HostnameSource hostname_source;
  71
  72         struct stat etc_hostname_stat;
  73         struct stat etc_os_release_stat;
  74         struct stat etc_machine_info_stat;
  75
  76         Hashmap *polkit_registry;
  77 } Context;
  78
  79 static void context_reset(Context *c, uint64_t mask) {
  80         assert(c);
  81
  82         for (int p = 0; p < _PROP_MAX; p++) {
  83                 if (!FLAGS_SET(mask, UINT64_C(1) << p))
  84                         continue;
  85
  86                 c->data[p] = mfree(c->data[p]);
  87         }
  88 }
  89
  90 static void context_destroy(Context *c) {
  91         assert(c);
  92
  93         context_reset(c, UINT64_MAX);
  94         bus_verify_polkit_async_registry_free(c->polkit_registry);
  95 }
  96
  97 static void context_read_etc_hostname(Context *c) {
  98         struct stat current_stat = {};
  99         int r;
 100
 101         assert(c);
 102
 103         if (stat("/etc/hostname", &current_stat) >= 0 &&
 104             stat_inode_unmodified(&c->etc_hostname_stat, &current_stat))
 105                 return;
 106
 107         context_reset(c, UINT64_C(1) << PROP_STATIC_HOSTNAME);
 108
 109         r = read_etc_hostname(NULL, &c->data[PROP_STATIC_HOSTNAME]);
 110         if (r < 0 && r != -ENOENT)
 111                 log_warning_errno(r, "Failed to read /etc/hostname, ignoring: %m");
 112
 113         c->etc_hostname_stat = current_stat;
 114 }
 115
 116 static void context_read_machine_info(Context *c) {
 117         struct stat current_stat = {};
 118         int r;
 119
 120         assert(c);
 121
 122         if (stat("/etc/machine-info", &current_stat) >= 0 &&
 123             stat_inode_unmodified(&c->etc_machine_info_stat, &current_stat))
 124                 return;
 125
 126         context_reset(c,
 127                       (UINT64_C(1) << PROP_PRETTY_HOSTNAME) |
 128                       (UINT64_C(1) << PROP_ICON_NAME) |
 129                       (UINT64_C(1) << PROP_CHASSIS) |
 130                       (UINT64_C(1) << PROP_DEPLOYMENT) |
 131                       (UINT64_C(1) << PROP_LOCATION));
 132
 133         r = parse_env_file(NULL, "/etc/machine-info",
 134                            "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
 135                            "ICON_NAME", &c->data[PROP_ICON_NAME],
 136                            "CHASSIS", &c->data[PROP_CHASSIS],
 137                            "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
 138                            "LOCATION", &c->data[PROP_LOCATION],
 139                            "VENDOR", &c->data[PROP_VENDOR],
 140                            "MODEL", &c->data[PROP_MODEL]);
 141         if (r < 0 && r != -ENOENT)
 142                 log_warning_errno(r, "Failed to read /etc/machine-info, ignoring: %m");
 143
 144         c->etc_machine_info_stat = current_stat;
 145 }
 146
 147 static void context_read_os_release(Context *c) {
 148         struct stat current_stat = {};
 149         int r;
 150
 151         assert(c);
 152
 153         if ((stat("/etc/os-release", &current_stat) >= 0 ||
 154              stat("/usr/lib/os-release", &current_stat) >= 0) &&
 155             stat_inode_unmodified(&c->etc_os_release_stat, &current_stat))
 156                 return;
 157
 158         context_reset(c,
 159                       (UINT64_C(1) << PROP_OS_PRETTY_NAME) |
 160                       (UINT64_C(1) << PROP_OS_CPE_NAME) |
 161                       (UINT64_C(1) << PROP_OS_HOME_URL));
 162
 163         r = parse_os_release(NULL,
 164                              "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
 165                              "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
 166                              "HOME_URL", &c->data[PROP_OS_HOME_URL]);
 167         if (r < 0 && r != -ENOENT)
 168                 log_warning_errno(r, "Failed to read os-release file, ignoring: %m");
 169
 170         c->etc_os_release_stat = current_stat;
 171 }
 172
 173 static int get_dmi_data(const char *database_key, const char *regular_key, char **ret) {
 174         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 175         _cleanup_free_ char *b = NULL;
 176         const char *s = NULL;
 177         int r;
 178
 179         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
 180         if (r < 0)
 181                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
 182
 183         if (database_key)
 184                 (void) sd_device_get_property_value(device, database_key, &s);
 185         if (!s && regular_key)
 186                 (void) sd_device_get_property_value(device, regular_key, &s);
 187
 188         if (!ret)
 189                 return !!s;
 190
 191         if (s) {
 192                 b = strdup(s);
 193                 if (!b)
 194                         return -ENOMEM;
 195         }
 196
 197         *ret = TAKE_PTR(b);
 198         return !!s;
 199 }
 200
 201 static int get_hardware_vendor(char **ret) {
 202         return get_dmi_data("ID_VENDOR_FROM_DATABASE", "ID_VENDOR", ret);
 203 }
 204
 205 static int get_hardware_model(char **ret) {
 206         return get_dmi_data("ID_MODEL_FROM_DATABASE", "ID_MODEL", ret);
 207 }
 208
 209 static int get_hardware_serial(char **ret) {
 210         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
 211         _cleanup_free_ char *b = NULL;
 212         const char *s = NULL;
 213         int r;
 214
 215         r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id");
 216         if (r < 0)
 217                 return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m");
 218
 219         (void) sd_device_get_sysattr_value(device, "product_serial", &s);
 220         if (isempty(s))
 221                 /* Fallback to board serial */
 222                 (void) sd_device_get_sysattr_value(device, "board_serial", &s);
 223
 224         if (!isempty(s)) {
 225                 b = strdup(s);
 226                 if (!b)
 227                         return -ENOMEM;
 228         }
 229
 230         if (ret)
 231                 *ret = TAKE_PTR(b);
 232
 233         return !isempty(s);
 234 }
 235
 236 static const char* valid_chassis(const char *chassis) {
 237         assert(chassis);
 238
 239         return nulstr_get(
 240                         "vm\0"
 241                         "container\0"
 242                         "desktop\0"
 243                         "laptop\0"
 244                         "convertible\0"
 245                         "server\0"
 246                         "tablet\0"
 247                         "handset\0"
 248                         "watch\0"
 249                         "embedded\0",
 250                         chassis);
 251 }
 252
 253 static bool valid_deployment(const char *deployment) {
 254         assert(deployment);
 255
 256         return in_charset(deployment, VALID_DEPLOYMENT_CHARS);
 257 }
 258
 259 static const char* fallback_chassis(void) {
 260         const char *chassis;
 261         _cleanup_free_ char *type = NULL;
 262         unsigned t;
 263         int v, r;
 264
 265         v = detect_virtualization();
 266         if (v < 0)
 267                 log_debug_errno(v, "Failed to detect virtualization, ignoring: %m");
 268         else if (VIRTUALIZATION_IS_VM(v))
 269                 return "vm";
 270         else if (VIRTUALIZATION_IS_CONTAINER(v))
 271                 return "container";
 272
 273         r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
 274         if (r < 0) {
 275                 log_debug_errno(r, "Failed to read DMI chassis type, ignoring: %m");
 276                 goto try_acpi;
 277         }
 278
 279         r = safe_atou(type, &t);
 280         if (r < 0) {
 281                 log_debug_errno(r, "Failed to parse DMI chassis type \"%s\", ignoring: %m", type);
 282                 goto try_acpi;
 283         }
 284
 285         /* We only list the really obvious cases here. The DMI data is unreliable enough, so let's not do any
 286          * additional guesswork on top of that.
 287          *
 288          * See the SMBIOS Specification 3.5.0 section 7.4.1 for details about the values listed here:
 289          *
 290          * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.5.0.pdf
 291          */
 292
 293         switch (t) {
 294
 295         case 0x03: /* Desktop */
 296         case 0x04: /* Low Profile Desktop */
 297         case 0x06: /* Mini Tower */
 298         case 0x07: /* Tower */
 299         case 0x0D: /* All in one (i.e. PC built into monitor) */
 300         case 0x23: /* Mini PC */
 301         case 0x24: /* Stick PC */
 302                 return "desktop";
 303
 304         case 0x8: /* Portable */
 305         case 0x9: /* Laptop */
 306         case 0xA: /* Notebook */
 307         case 0xE: /* Sub Notebook */
 308                 return "laptop";
 309
 310         case 0xB: /* Hand Held */
 311                 return "handset";
 312
 313         case 0x11: /* Main Server Chassis */
 314         case 0x1C: /* Blade */
 315         case 0x1D: /* Blade Enclosure */
 316                 return "server";
 317
 318         case 0x1E: /* Tablet */
 319                 return "tablet";
 320
 321         case 0x1F: /* Convertible */
 322         case 0x20: /* Detachable */
 323                 return "convertible";
 324
 325         case 0x21: /* IoT Gateway */
 326         case 0x22: /* Embedded PC */
 327                 return "embedded";
 328
 329         default:
 330                 log_debug("Unhandled DMI chassis type 0x%02x, ignoring.", t);
 331         }
 332
 333 try_acpi:
 334         type = mfree(type);
 335         r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);
 336         if (r < 0) {
 337                 log_debug_errno(r, "Failed read ACPI PM profile, ignoring: %m");
 338                 goto try_devicetree;
 339         }
 340
 341         r = safe_atou(type, &t);
 342         if (r < 0) {
 343                 log_debug_errno(r, "Failed parse ACPI PM profile \"%s\", ignoring: %m", type);
 344                 goto try_devicetree;
 345         }
 346
 347         /* We only list the really obvious cases here as the ACPI data is not really super reliable.
 348          *
 349          * See the ACPI 5.0 Spec Section 5.2.9.1 for details:
 350          *
 351          * http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
 352          */
 353
 354         switch(t) {
 355
 356         case 1: /* Desktop */
 357         case 3: /* Workstation */
 358         case 6: /* Appliance PC */
 359                 return "desktop";
 360
 361         case 2: /* Mobile */
 362                 return "laptop";
 363
 364         case 4: /* Enterprise Server */
 365         case 5: /* SOHO Server */
 366         case 7: /* Performance Server */
 367                 return "server";
 368
 369         case 8: /* Tablet */
 370                 return "tablet";
 371
 372         default:
 373                 log_debug("Unhandled ACPI PM profile 0x%02x, ignoring.", t);
 374         }
 375
 376 try_devicetree:
 377         type = mfree(type);
 378         r = read_one_line_file("/proc/device-tree/chassis-type", &type);
 379         if (r < 0) {
 380                 log_debug_errno(r, "Failed to read device-tree chassis type, ignoring: %m");
 381                 return NULL;
 382         }
 383
 384         /* Note that the Devicetree specification uses the very same vocabulary
 385          * of chassis types as we do, hence we do not need to translate these types:
 386          *
 387          * https://github.com/devicetree-org/devicetree-specification/blob/master/source/chapter3-devicenodes.rst */
 388         chassis = valid_chassis(type);
 389         if (!chassis)
 390                 log_debug("Invalid device-tree chassis type \"%s\", ignoring.", type);
 391         return chassis;
 392 }
 393
 394 static char* context_get_chassis(Context *c) {
 395         const char *fallback;
 396         char *dmi;
 397
 398         assert(c);
 399
 400         if (!isempty(c->data[PROP_CHASSIS]))
 401                 return strdup(c->data[PROP_CHASSIS]);
 402
 403         if (get_dmi_data("ID_CHASSIS", NULL, &dmi) >= 0)
 404                 return dmi;
 405
 406         fallback = fallback_chassis();
 407         if (fallback)
 408                 return strdup(fallback);
 409
 410         return NULL;
 411 }
 412
 413 static char* context_fallback_icon_name(Context *c) {
 414         _cleanup_free_ char *chassis = NULL;
 415
 416         assert(c);
 417
 418         chassis = context_get_chassis(c);
 419         if (chassis)
 420                 return strjoin("computer-", chassis);
 421
 422         return strdup("computer");
 423 }
 424
 425 static int context_update_kernel_hostname(
 426                 Context *c,
 427                 const char *transient_hn) {
 428
 429         _cleanup_free_ char *_hn_free = NULL;
 430         const char *hn;
 431         HostnameSource hns;
 432         int r;
 433
 434         assert(c);
 435
 436         /* /etc/hostname has the highest preference ... */
 437         if (c->data[PROP_STATIC_HOSTNAME]) {
 438                 hn = c->data[PROP_STATIC_HOSTNAME];
 439                 hns = HOSTNAME_STATIC;
 440
 441         /* ... the transient hostname, (ie: DHCP) comes next ... */
 442         } else if (transient_hn) {
 443                 hn = transient_hn;
 444                 hns = HOSTNAME_TRANSIENT;
 445
 446         /* ... and the ultimate fallback */
 447         } else {
 448                 hn = _hn_free = get_default_hostname();
 449                 if (!hn)
 450                         return log_oom();
 451
 452                 hns = HOSTNAME_DEFAULT;
 453         }
 454
 455         r = sethostname_idempotent(hn);
 456         if (r < 0)
 457                 return log_error_errno(r, "Failed to set hostname: %m");
 458
 459         if (c->hostname_source != hns) {
 460                 c->hostname_source = hns;
 461                 r = 1;
 462         }
 463
 464         (void) nscd_flush_cache(STRV_MAKE("hosts"));
 465
 466         if (r == 0)
 467                 log_debug("Hostname was already set to <%s>.", hn);
 468         else {
 469                 log_info("Hostname set to <%s> (%s)", hn, hostname_source_to_string(hns));
 470
 471                 hostname_update_source_hint(hn, hns);
 472         }
 473
 474         return r; /* 0 if no change, 1 if something was done  */
 475 }
 476
 477 static void unset_statp(struct stat **p) {
 478         if (!*p)
 479                 return;
 480
 481         **p = (struct stat) {};
 482 }
 483
 484 static int context_write_data_static_hostname(Context *c) {
 485         _cleanup_(unset_statp) struct stat *s = NULL;
 486         int r;
 487
 488         assert(c);
 489
 490         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 491          * already, even if we can't make it hit the disk. */
 492         s = &c->etc_hostname_stat;
 493
 494         if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
 495                 if (unlink("/etc/hostname") < 0 && errno != ENOENT)
 496                         return -errno;
 497
 498                 TAKE_PTR(s);
 499                 return 0;
 500         }
 501
 502         r = write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
 503         if (r < 0)
 504                 return r;
 505
 506         TAKE_PTR(s);
 507         return 0;
 508 }
 509
 510 static int context_write_data_machine_info(Context *c) {
 511         _cleanup_(unset_statp) struct stat *s = NULL;
 512         static const char * const name[_PROP_MAX] = {
 513                 [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
 514                 [PROP_ICON_NAME] = "ICON_NAME",
 515                 [PROP_CHASSIS] = "CHASSIS",
 516                 [PROP_DEPLOYMENT] = "DEPLOYMENT",
 517                 [PROP_LOCATION] = "LOCATION",
 518         };
 519         _cleanup_strv_free_ char **l = NULL;
 520         int r;
 521
 522         assert(c);
 523
 524         /* Make sure that if we fail here, we invalidate the cached information, since it was updated
 525          * already, even if we can't make it hit the disk. */
 526         s = &c->etc_machine_info_stat;
 527
 528         r = load_env_file(NULL, "/etc/machine-info", &l);
 529         if (r < 0 && r != -ENOENT)
 530                 return r;
 531
 532         for (int p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
 533                 assert(name[p]);
 534
 535                 r = strv_env_assign(&l, name[p], empty_to_null(c->data[p]));
 536                 if (r < 0)
 537                         return r;
 538         }
 539
 540         if (strv_isempty(l)) {
 541                 if (unlink("/etc/machine-info") < 0 && errno != ENOENT)
 542                         return -errno;
 543
 544                 TAKE_PTR(s);
 545                 return 0;
 546         }
 547
 548         r = write_env_file_label("/etc/machine-info", l);
 549         if (r < 0)
 550                 return r;
 551
 552         TAKE_PTR(s);
 553         return 0;
 554 }
 555
 556 static int property_get_hardware_property(
 557                 sd_bus_message *reply,
 558                 Context *c,
 559                 HostProperty prop,
 560                 int (*getter)(char **)) {
 561
 562         _cleanup_free_ char *from_dmi = NULL;
 563
 564         assert(reply);
 565         assert(c);
 566         assert(IN_SET(prop, PROP_VENDOR, PROP_MODEL));
 567         assert(getter);
 568
 569         context_read_machine_info(c);
 570
 571         if (isempty(c->data[prop]))
 572                 (void) getter(&from_dmi);
 573
 574         return sd_bus_message_append(reply, "s", from_dmi ?: c->data[prop]);
 575 }
 576
 577 static int property_get_hardware_vendor(
 578                 sd_bus *bus,
 579                 const char *path,
 580                 const char *interface,
 581                 const char *property,
 582                 sd_bus_message *reply,
 583                 void *userdata,
 584                 sd_bus_error *error) {
 585
 586         return property_get_hardware_property(reply, userdata, PROP_VENDOR, get_hardware_vendor);
 587 }
 588
 589 static int property_get_hardware_model(
 590                 sd_bus *bus,
 591                 const char *path,
 592                 const char *interface,
 593                 const char *property,
 594                 sd_bus_message *reply,
 595                 void *userdata,
 596                 sd_bus_error *error) {
 597
 598         return property_get_hardware_property(reply, userdata, PROP_MODEL, get_hardware_model);
 599 }
 600
 601 static int property_get_hostname(
 602                 sd_bus *bus,
 603                 const char *path,
 604                 const char *interface,
 605                 const char *property,
 606                 sd_bus_message *reply,
 607                 void *userdata,
 608                 sd_bus_error *error) {
 609
 610         _cleanup_free_ char *hn = NULL;
 611         int r;
 612
 613         r = gethostname_strict(&hn);
 614         if (r < 0) {
 615                 if (r != -ENXIO)
 616                         return r;
 617
 618                 hn = get_default_hostname();
 619                 if (!hn)
 620                         return -ENOMEM;
 621         }
 622
 623         return sd_bus_message_append(reply, "s", hn);
 624 }
 625
 626 static int property_get_static_hostname(
 627                 sd_bus *bus,
 628                 const char *path,
 629                 const char *interface,
 630                 const char *property,
 631                 sd_bus_message *reply,
 632                 void *userdata,
 633                 sd_bus_error *error) {
 634
 635         Context *c = userdata;
 636         assert(c);
 637
 638         context_read_etc_hostname(c);
 639
 640         return sd_bus_message_append(reply, "s", c->data[PROP_STATIC_HOSTNAME]);
 641 }
 642
 643 static int property_get_default_hostname(
 644                 sd_bus *bus,
 645                 const char *path,
 646                 const char *interface,
 647                 const char *property,
 648                 sd_bus_message *reply,
 649                 void *userdata,
 650                 sd_bus_error *error) {
 651
 652         _cleanup_free_ char *hn = NULL;
 653
 654         hn = get_default_hostname();
 655         if (!hn)
 656                 return log_oom();
 657
 658         return sd_bus_message_append(reply, "s", hn);
 659 }
 660
 661 static void context_determine_hostname_source(Context *c) {
 662         _cleanup_free_ char *hostname = NULL;
 663         int r;
 664
 665         assert(c);
 666
 667         if (c->hostname_source >= 0)
 668                 return;
 669
 670         (void) gethostname_full(GET_HOSTNAME_ALLOW_LOCALHOST, &hostname);
 671
 672         if (streq_ptr(hostname, c->data[PROP_STATIC_HOSTNAME]))
 673                 c->hostname_source = HOSTNAME_STATIC;
 674         else {
 675                 _cleanup_free_ char *fallback = NULL;
 676
 677                 /* If the hostname was not set by us, try to figure out where it came from. If we set it to
 678                  * the default hostname, the file will tell us. We compare the string because it is possible
 679                  * that the hostname was set by an older version that had a different fallback, in the
 680                  * initramfs or before we reexecuted. */
 681
 682                 r = read_one_line_file("/run/systemd/default-hostname", &fallback);
 683                 if (r < 0 && r != -ENOENT)
 684                         log_warning_errno(r, "Failed to read /run/systemd/default-hostname, ignoring: %m");
 685
 686                 if (streq_ptr(fallback, hostname))
 687                         c->hostname_source = HOSTNAME_DEFAULT;
 688                 else
 689                         c->hostname_source = HOSTNAME_TRANSIENT;
 690         }
 691 }
 692
 693 static int property_get_hostname_source(
 694                 sd_bus *bus,
 695                 const char *path,
 696                 const char *interface,
 697                 const char *property,
 698                 sd_bus_message *reply,
 699                 void *userdata,
 700                 sd_bus_error *error) {
 701
 702         Context *c = userdata;
 703         assert(c);
 704
 705         context_read_etc_hostname(c);
 706         context_determine_hostname_source(c);
 707
 708         return sd_bus_message_append(reply, "s", hostname_source_to_string(c->hostname_source));
 709 }
 710
 711 static int property_get_machine_info_field(
 712                 sd_bus *bus,
 713                 const char *path,
 714                 const char *interface,
 715                 const char *property,
 716                 sd_bus_message *reply,
 717                 void *userdata,
 718                 sd_bus_error *error) {
 719
 720         sd_bus_slot *slot;
 721         Context *c;
 722
 723         /* Acquire the context object without this property's userdata offset added. Explanation: we want
 724          * access to two pointers here: a) the main context object we cache all properties in, and b) the
 725          * pointer to the property field inside the context object that we are supposed to update and
 726          * use. The latter (b) we get in the 'userdata' function parameter, and sd-bus calculates that for us
 727          * from the 'userdata' pointer we supplied when the vtable was registered, with the offset we
 728          * specified in the vtable added on top. To get the former (a) we need the 'userdata' pointer from
 729          * the vtable registration directly, without the offset added. Hence we ask sd-bus what the slot
 730          * object is (which encapsulates the vtable registration), and then query the 'userdata' field
 731          * directly off it. */
 732         assert_se(slot = sd_bus_get_current_slot(bus));
 733         assert_se(c = sd_bus_slot_get_userdata(slot));
 734
 735         context_read_machine_info(c);
 736
 737         return sd_bus_message_append(reply, "s", *(char**) userdata);
 738 }
 739
 740 static int property_get_os_release_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         /* As above, acquire the current context without this property's userdata offset added. */
 753         assert_se(slot = sd_bus_get_current_slot(bus));
 754         assert_se(c = sd_bus_slot_get_userdata(slot));
 755
 756         context_read_os_release(c);
 757
 758         return sd_bus_message_append(reply, "s", *(char**) userdata);
 759 }
 760
 761 static int property_get_icon_name(
 762                 sd_bus *bus,
 763                 const char *path,
 764                 const char *interface,
 765                 const char *property,
 766                 sd_bus_message *reply,
 767                 void *userdata,
 768                 sd_bus_error *error) {
 769
 770         _cleanup_free_ char *n = NULL;
 771         Context *c = userdata;
 772         const char *name;
 773
 774         context_read_machine_info(c);
 775
 776         if (isempty(c->data[PROP_ICON_NAME]))
 777                 name = n = context_fallback_icon_name(c);
 778         else
 779                 name = c->data[PROP_ICON_NAME];
 780
 781         if (!name)
 782                 return -ENOMEM;
 783
 784         return sd_bus_message_append(reply, "s", name);
 785 }
 786
 787 static int property_get_chassis(
 788                 sd_bus *bus,
 789                 const char *path,
 790                 const char *interface,
 791                 const char *property,
 792                 sd_bus_message *reply,
 793                 void *userdata,
 794                 sd_bus_error *error) {
 795
 796         _cleanup_free_ char *chassis = NULL;
 797         Context *c = userdata;
 798
 799         context_read_machine_info(c);
 800
 801         chassis = context_get_chassis(c);
 802
 803         return sd_bus_message_append(reply, "s", chassis);
 804 }
 805
 806 static int property_get_uname_field(
 807                 sd_bus *bus,
 808                 const char *path,
 809                 const char *interface,
 810                 const char *property,
 811                 sd_bus_message *reply,
 812                 void *userdata,
 813                 sd_bus_error *error) {
 814
 815         struct utsname u;
 816
 817         assert_se(uname(&u) >= 0);
 818
 819         return sd_bus_message_append(reply, "s", (char*) &u + PTR_TO_SIZE(userdata));
 820 }
 821
 822 static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 823         Context *c = userdata;
 824         const char *name;
 825         int interactive, r;
 826
 827         assert(m);
 828         assert(c);
 829
 830         r = sd_bus_message_read(m, "sb", &name, &interactive);
 831         if (r < 0)
 832                 return r;
 833
 834         name = empty_to_null(name);
 835
 836         /* We always go through with the procedure below without comparing to the current hostname, because
 837          * we might want to adjust hostname source information even if the actual hostname is unchanged. */
 838
 839         if (name && !hostname_is_valid(name, 0))
 840                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
 841
 842         context_read_etc_hostname(c);
 843
 844         r = bus_verify_polkit_async(
 845                         m,
 846                         CAP_SYS_ADMIN,
 847                         "org.freedesktop.hostname1.set-hostname",
 848                         NULL,
 849                         interactive,
 850                         UID_INVALID,
 851                         &c->polkit_registry,
 852                         error);
 853         if (r < 0)
 854                 return r;
 855         if (r == 0)
 856                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 857
 858         r = context_update_kernel_hostname(c, name);
 859         if (r < 0)
 860                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 861         else if (r > 0)
 862                 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 863                                                       "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 864                                                       "Hostname", "HostnameSource", NULL);
 865
 866         return sd_bus_reply_method_return(m, NULL);
 867 }
 868
 869 static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 870         Context *c = userdata;
 871         const char *name;
 872         int interactive;
 873         int r;
 874
 875         assert(m);
 876         assert(c);
 877
 878         r = sd_bus_message_read(m, "sb", &name, &interactive);
 879         if (r < 0)
 880                 return r;
 881
 882         name = empty_to_null(name);
 883
 884         context_read_etc_hostname(c);
 885
 886         if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
 887                 return sd_bus_reply_method_return(m, NULL);
 888
 889         if (name && !hostname_is_valid(name, 0))
 890                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
 891
 892         r = bus_verify_polkit_async(
 893                         m,
 894                         CAP_SYS_ADMIN,
 895                         "org.freedesktop.hostname1.set-static-hostname",
 896                         NULL,
 897                         interactive,
 898                         UID_INVALID,
 899                         &c->polkit_registry,
 900                         error);
 901         if (r < 0)
 902                 return r;
 903         if (r == 0)
 904                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 905
 906         r = free_and_strdup_warn(&c->data[PROP_STATIC_HOSTNAME], name);
 907         if (r < 0)
 908                 return r;
 909
 910         r = context_write_data_static_hostname(c);
 911         if (r < 0) {
 912                 log_error_errno(r, "Failed to write static hostname: %m");
 913                 if (ERRNO_IS_PRIVILEGE(r))
 914                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/hostname.");
 915                 if (r == -EROFS)
 916                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/hostname is in a read-only filesystem.");
 917                 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %m");
 918         }
 919
 920         r = context_update_kernel_hostname(c, NULL);
 921         if (r < 0) {
 922                 log_error_errno(r, "Failed to set hostname: %m");
 923                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
 924         }
 925
 926         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
 927                                               "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 928                                               "StaticHostname", "Hostname", "HostnameSource", NULL);
 929
 930         return sd_bus_reply_method_return(m, NULL);
 931 }
 932
 933 static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
 934         int interactive;
 935         const char *name;
 936         int r;
 937
 938         assert(c);
 939         assert(m);
 940
 941         r = sd_bus_message_read(m, "sb", &name, &interactive);
 942         if (r < 0)
 943                 return r;
 944
 945         name = empty_to_null(name);
 946
 947         context_read_machine_info(c);
 948
 949         if (streq_ptr(name, c->data[prop]))
 950                 return sd_bus_reply_method_return(m, NULL);
 951
 952         if (!isempty(name)) {
 953                 /* The icon name might ultimately be used as file
 954                  * name, so better be safe than sorry */
 955
 956                 if (prop == PROP_ICON_NAME && !filename_is_valid(name))
 957                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
 958                 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
 959                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty hostname '%s'", name);
 960                 if (prop == PROP_CHASSIS && !valid_chassis(name))
 961                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
 962                 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
 963                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
 964                 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
 965                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
 966         }
 967
 968         /* Since the pretty hostname should always be changed at the
 969          * same time as the static one, use the same policy action for
 970          * both... */
 971
 972         r = bus_verify_polkit_async(
 973                         m,
 974                         CAP_SYS_ADMIN,
 975                         prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
 976                         NULL,
 977                         interactive,
 978                         UID_INVALID,
 979                         &c->polkit_registry,
 980                         error);
 981         if (r < 0)
 982                 return r;
 983         if (r == 0)
 984                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 985
 986         r = free_and_strdup_warn(&c->data[prop], name);
 987         if (r < 0)
 988                 return r;
 989
 990         r = context_write_data_machine_info(c);
 991         if (r < 0) {
 992                 log_error_errno(r, "Failed to write machine info: %m");
 993                 if (ERRNO_IS_PRIVILEGE(r))
 994                         return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/machine-info.");
 995                 if (r == -EROFS)
 996                         return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/machine-info is in a read-only filesystem.");
 997                 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %m");
 998         }
 999
1000         log_info("Changed %s to '%s'",
1001                  prop == PROP_PRETTY_HOSTNAME ? "pretty hostname" :
1002                  prop == PROP_DEPLOYMENT ? "deployment" :
1003                  prop == PROP_LOCATION ? "location" :
1004                  prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
1005
1006         (void) sd_bus_emit_properties_changed(
1007                         sd_bus_message_get_bus(m),
1008                         "/org/freedesktop/hostname1",
1009                         "org.freedesktop.hostname1",
1010                         prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
1011                         prop == PROP_DEPLOYMENT ? "Deployment" :
1012                         prop == PROP_LOCATION ? "Location" :
1013                         prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
1014
1015         return sd_bus_reply_method_return(m, NULL);
1016 }
1017
1018 static int method_set_pretty_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1019         return set_machine_info(userdata, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
1020 }
1021
1022 static int method_set_icon_name(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1023         return set_machine_info(userdata, m, PROP_ICON_NAME, method_set_icon_name, error);
1024 }
1025
1026 static int method_set_chassis(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1027         return set_machine_info(userdata, m, PROP_CHASSIS, method_set_chassis, error);
1028 }
1029
1030 static int method_set_deployment(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1031         return set_machine_info(userdata, m, PROP_DEPLOYMENT, method_set_deployment, error);
1032 }
1033
1034 static int method_set_location(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1035         return set_machine_info(userdata, m, PROP_LOCATION, method_set_location, error);
1036 }
1037
1038 static int method_get_product_uuid(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1039         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1040         Context *c = userdata;
1041         int interactive, r;
1042         sd_id128_t uuid;
1043
1044         assert(m);
1045         assert(c);
1046
1047         r = sd_bus_message_read(m, "b", &interactive);
1048         if (r < 0)
1049                 return r;
1050
1051         r = bus_verify_polkit_async(
1052                         m,
1053                         CAP_SYS_ADMIN,
1054                         "org.freedesktop.hostname1.get-product-uuid",
1055                         NULL,
1056                         interactive,
1057                         UID_INVALID,
1058                         &c->polkit_registry,
1059                         error);
1060         if (r < 0)
1061                 return r;
1062         if (r == 0)
1063                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1064
1065         r = id128_get_product(&uuid);
1066         if (r < 0) {
1067                 if (r == -EADDRNOTAVAIL)
1068                         log_debug_errno(r, "DMI product UUID is all 0x00 or all 0xFF, ignoring.");
1069                 else
1070                         log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
1071                                        "Failed to read product UUID, ignoring: %m");
1072
1073                 return sd_bus_error_set(error, BUS_ERROR_NO_PRODUCT_UUID,
1074                                         "Failed to read product UUID from firmware.");
1075         }
1076
1077         r = sd_bus_message_new_method_return(m, &reply);
1078         if (r < 0)
1079                 return r;
1080
1081         r = sd_bus_message_append_array(reply, 'y', uuid.bytes, sizeof(uuid.bytes));
1082         if (r < 0)
1083                 return r;
1084
1085         return sd_bus_send(NULL, reply, NULL);
1086 }
1087
1088 static int method_get_hardware_serial(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1089         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1090         _cleanup_free_ char *serial = NULL;
1091         Context *c = userdata;
1092         int r;
1093
1094         assert(m);
1095         assert(c);
1096
1097         r = bus_verify_polkit_async(
1098                         m,
1099                         CAP_SYS_ADMIN,
1100                         "org.freedesktop.hostname1.get-hardware-serial",
1101                         NULL,
1102                         false,
1103                         UID_INVALID,
1104                         &c->polkit_registry,
1105                         error);
1106         if (r < 0)
1107                 return r;
1108         if (r == 0)
1109                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1110
1111         r = get_hardware_serial(&serial);
1112         if (r < 0)
1113                 return r;
1114
1115         r = sd_bus_message_new_method_return(m, &reply);
1116         if (r < 0)
1117                 return r;
1118
1119         r = sd_bus_message_append(reply, "s", serial);
1120         if (r < 0)
1121                 return r;
1122
1123         return sd_bus_send(NULL, reply, NULL);
1124 }
1125
1126 static int method_describe(sd_bus_message *m, void *userdata, sd_bus_error *error) {
1127         _cleanup_free_ char *hn = NULL, *dhn = NULL, *in = NULL, *text = NULL,
1128                 *chassis = NULL, *vendor = NULL, *model = NULL, *serial = NULL;
1129         _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
1130         _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
1131         sd_id128_t product_uuid = SD_ID128_NULL;
1132         Context *c = userdata;
1133         bool privileged;
1134         struct utsname u;
1135         int r;
1136
1137         assert(m);
1138         assert(c);
1139
1140         r = bus_verify_polkit_async(
1141                         m,
1142                         CAP_SYS_ADMIN,
1143                         "org.freedesktop.hostname1.get-description",
1144                         NULL,
1145                         false,
1146                         UID_INVALID,
1147                         &c->polkit_registry,
1148                         NULL);
1149         if (r == 0)
1150                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
1151
1152         /* We ignore all authentication errors here, since most data is unprivileged, the one exception being
1153          * the product ID which we'll check explicitly. */
1154         privileged = r > 0;
1155
1156         context_read_etc_hostname(c);
1157         context_read_machine_info(c);
1158         context_read_os_release(c);
1159         context_determine_hostname_source(c);
1160
1161         r = gethostname_strict(&hn);
1162         if (r < 0) {
1163                 if (r != -ENXIO)
1164                         return log_error_errno(r, "Failed to read local host name: %m");
1165
1166                 hn = get_default_hostname();
1167                 if (!hn)
1168                         return log_oom();
1169         }
1170
1171         dhn = get_default_hostname();
1172         if (!dhn)
1173                 return log_oom();
1174
1175         if (isempty(c->data[PROP_ICON_NAME]))
1176                 in = context_fallback_icon_name(c);
1177
1178         chassis = context_get_chassis(c);
1179
1180         assert_se(uname(&u) >= 0);
1181
1182         if (isempty(c->data[PROP_VENDOR]))
1183                 (void) get_hardware_vendor(&vendor);
1184         if (isempty(c->data[PROP_MODEL]))
1185                 (void) get_hardware_model(&model);
1186
1187         if (privileged) {
1188                 /* The product UUID and hardware serial is only available to privileged clients */
1189                 (void) id128_get_product(&product_uuid);
1190                 (void) get_hardware_serial(&serial);
1191         }
1192
1193         r = json_build(&v, JSON_BUILD_OBJECT(
1194                                        JSON_BUILD_PAIR("Hostname", JSON_BUILD_STRING(hn)),
1195                                        JSON_BUILD_PAIR("StaticHostname", JSON_BUILD_STRING(c->data[PROP_STATIC_HOSTNAME])),
1196                                        JSON_BUILD_PAIR("PrettyHostname", JSON_BUILD_STRING(c->data[PROP_PRETTY_HOSTNAME])),
1197                                        JSON_BUILD_PAIR("DefaultHostname", JSON_BUILD_STRING(dhn)),
1198                                        JSON_BUILD_PAIR("HostnameSource", JSON_BUILD_STRING(hostname_source_to_string(c->hostname_source))),
1199                                        JSON_BUILD_PAIR("IconName", JSON_BUILD_STRING(in ?: c->data[PROP_ICON_NAME])),
1200                                        JSON_BUILD_PAIR("Chassis", JSON_BUILD_STRING(chassis)),
1201                                        JSON_BUILD_PAIR("Deployment", JSON_BUILD_STRING(c->data[PROP_DEPLOYMENT])),
1202                                        JSON_BUILD_PAIR("Location", JSON_BUILD_STRING(c->data[PROP_LOCATION])),
1203                                        JSON_BUILD_PAIR("KernelName", JSON_BUILD_STRING(u.sysname)),
1204                                        JSON_BUILD_PAIR("KernelRelease", JSON_BUILD_STRING(u.release)),
1205                                        JSON_BUILD_PAIR("KernelVersion", JSON_BUILD_STRING(u.version)),
1206                                        JSON_BUILD_PAIR("OperatingSystemPrettyName", JSON_BUILD_STRING(c->data[PROP_OS_PRETTY_NAME])),
1207                                        JSON_BUILD_PAIR("OperatingSystemCPEName", JSON_BUILD_STRING(c->data[PROP_OS_CPE_NAME])),
1208                                        JSON_BUILD_PAIR("OperatingSystemHomeURL", JSON_BUILD_STRING(c->data[PROP_OS_HOME_URL])),
1209                                        JSON_BUILD_PAIR("HardwareVendor", JSON_BUILD_STRING(vendor ?: c->data[PROP_VENDOR])),
1210                                        JSON_BUILD_PAIR("HardwareModel", JSON_BUILD_STRING(model ?: c->data[PROP_MODEL])),
1211                                        JSON_BUILD_PAIR("HardwareSerial", JSON_BUILD_STRING(serial)),
1212                                        JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_ID128(product_uuid)),
1213                                        JSON_BUILD_PAIR_CONDITION(sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_NULL)));
1214
1215         if (r < 0)
1216                 return log_error_errno(r, "Failed to build JSON data: %m");
1217
1218         r = json_variant_format(v, 0, &text);
1219         if (r < 0)
1220                 return log_error_errno(r, "Failed to format JSON data: %m");
1221
1222         r = sd_bus_message_new_method_return(m, &reply);
1223         if (r < 0)
1224                 return r;
1225
1226         r = sd_bus_message_append(reply, "s", text);
1227         if (r < 0)
1228                 return r;
1229
1230         return sd_bus_send(NULL, reply, NULL);
1231 }
1232
1233 static const sd_bus_vtable hostname_vtable[] = {
1234         SD_BUS_VTABLE_START(0),
1235         SD_BUS_PROPERTY("Hostname", "s", property_get_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1236         SD_BUS_PROPERTY("StaticHostname", "s", property_get_static_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1237         SD_BUS_PROPERTY("PrettyHostname", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1238         SD_BUS_PROPERTY("DefaultHostname", "s", property_get_default_hostname, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1239         SD_BUS_PROPERTY("HostnameSource", "s", property_get_hostname_source, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1240         SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1241         SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1242         SD_BUS_PROPERTY("Deployment", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1243         SD_BUS_PROPERTY("Location", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
1244         SD_BUS_PROPERTY("KernelName", "s", property_get_uname_field, offsetof(struct utsname, sysname), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1245         SD_BUS_PROPERTY("KernelRelease", "s", property_get_uname_field, offsetof(struct utsname, release), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1246         SD_BUS_PROPERTY("KernelVersion", "s", property_get_uname_field, offsetof(struct utsname, version), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
1247         SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1248         SD_BUS_PROPERTY("OperatingSystemCPEName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
1249         SD_BUS_PROPERTY("HomeURL", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_HOME_URL, SD_BUS_VTABLE_PROPERTY_CONST),
1250         SD_BUS_PROPERTY("HardwareVendor", "s", property_get_hardware_vendor, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1251         SD_BUS_PROPERTY("HardwareModel", "s", property_get_hardware_model, 0, SD_BUS_VTABLE_PROPERTY_CONST),
1252
1253         SD_BUS_METHOD_WITH_NAMES("SetHostname",
1254                                  "sb",
1255                                  SD_BUS_PARAM(hostname)
1256                                  SD_BUS_PARAM(interactive),
1257                                  NULL,,
1258                                  method_set_hostname,
1259                                  SD_BUS_VTABLE_UNPRIVILEGED),
1260         SD_BUS_METHOD_WITH_NAMES("SetStaticHostname",
1261                                  "sb",
1262                                  SD_BUS_PARAM(hostname)
1263                                  SD_BUS_PARAM(interactive),
1264                                  NULL,,
1265                                  method_set_static_hostname,
1266                                  SD_BUS_VTABLE_UNPRIVILEGED),
1267         SD_BUS_METHOD_WITH_NAMES("SetPrettyHostname",
1268                                  "sb",
1269                                  SD_BUS_PARAM(hostname)
1270                                  SD_BUS_PARAM(interactive),
1271                                  NULL,,
1272                                  method_set_pretty_hostname,
1273                                  SD_BUS_VTABLE_UNPRIVILEGED),
1274         SD_BUS_METHOD_WITH_NAMES("SetIconName",
1275                                  "sb",
1276                                  SD_BUS_PARAM(icon)
1277                                  SD_BUS_PARAM(interactive),
1278                                  NULL,,
1279                                  method_set_icon_name,
1280                                  SD_BUS_VTABLE_UNPRIVILEGED),
1281         SD_BUS_METHOD_WITH_NAMES("SetChassis",
1282                                  "sb",
1283                                  SD_BUS_PARAM(chassis)
1284                                  SD_BUS_PARAM(interactive),
1285                                  NULL,,
1286                                  method_set_chassis,
1287                                  SD_BUS_VTABLE_UNPRIVILEGED),
1288         SD_BUS_METHOD_WITH_NAMES("SetDeployment",
1289                                  "sb",
1290                                  SD_BUS_PARAM(deployment)
1291                                  SD_BUS_PARAM(interactive),
1292                                  NULL,,
1293                                  method_set_deployment,
1294                                  SD_BUS_VTABLE_UNPRIVILEGED),
1295         SD_BUS_METHOD_WITH_NAMES("SetLocation",
1296                                  "sb",
1297                                  SD_BUS_PARAM(location)
1298                                  SD_BUS_PARAM(interactive),
1299                                  NULL,,
1300                                  method_set_location,
1301                                  SD_BUS_VTABLE_UNPRIVILEGED),
1302         SD_BUS_METHOD_WITH_NAMES("GetProductUUID",
1303                                  "b",
1304                                  SD_BUS_PARAM(interactive),
1305                                  "ay",
1306                                  SD_BUS_PARAM(uuid),
1307                                  method_get_product_uuid,
1308                                  SD_BUS_VTABLE_UNPRIVILEGED),
1309         SD_BUS_METHOD_WITH_NAMES("GetHardwareSerial",
1310                                  NULL,,
1311                                  "s",
1312                                  SD_BUS_PARAM(serial),
1313                                  method_get_hardware_serial,
1314                                  SD_BUS_VTABLE_UNPRIVILEGED),
1315         SD_BUS_METHOD_WITH_ARGS("Describe",
1316                                 SD_BUS_NO_ARGS,
1317                                 SD_BUS_RESULT("s", json),
1318                                 method_describe,
1319                                 SD_BUS_VTABLE_UNPRIVILEGED),
1320
1321         SD_BUS_VTABLE_END,
1322 };
1323
1324 static const BusObjectImplementation manager_object = {
1325         "/org/freedesktop/hostname1",
1326         "org.freedesktop.hostname1",
1327         .vtables = BUS_VTABLES(hostname_vtable),
1328 };
1329
1330 static int connect_bus(Context *c, sd_event *event, sd_bus **ret) {
1331         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1332         int r;
1333
1334         assert(c);
1335         assert(event);
1336         assert(ret);
1337
1338         r = sd_bus_default_system(&bus);
1339         if (r < 0)
1340                 return log_error_errno(r, "Failed to get system bus connection: %m");
1341
1342         r = bus_add_implementation(bus, &manager_object, c);
1343         if (r < 0)
1344                 return r;
1345
1346         r = bus_log_control_api_register(bus);
1347         if (r < 0)
1348                 return r;
1349
1350         r = sd_bus_request_name_async(bus, NULL, "org.freedesktop.hostname1", 0, NULL, NULL);
1351         if (r < 0)
1352                 return log_error_errno(r, "Failed to request name: %m");
1353
1354         r = sd_bus_attach_event(bus, event, 0);
1355         if (r < 0)
1356                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
1357
1358         *ret = TAKE_PTR(bus);
1359         return 0;
1360 }
1361
1362 static int run(int argc, char *argv[]) {
1363         _cleanup_(context_destroy) Context context = {
1364                 .hostname_source = _HOSTNAME_INVALID, /* appropriate value will be set later */
1365         };
1366         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
1367         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
1368         int r;
1369
1370         log_setup();
1371
1372         r = service_parse_argv("systemd-hostnamed.service",
1373                                "Manage the system hostname and related metadata.",
1374                                BUS_IMPLEMENTATIONS(&manager_object,
1375                                                    &log_control_object),
1376                                argc, argv);
1377         if (r <= 0)
1378                 return r;
1379
1380         umask(0022);
1381
1382         r = mac_selinux_init();
1383         if (r < 0)
1384                 return r;
1385
1386         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
1387
1388         r = sd_event_default(&event);
1389         if (r < 0)
1390                 return log_error_errno(r, "Failed to allocate event loop: %m");
1391
1392         (void) sd_event_set_watchdog(event, true);
1393
1394         r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
1395         if (r < 0)
1396                 return log_error_errno(r, "Failed to install SIGINT handler: %m");
1397
1398         r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
1399         if (r < 0)
1400                 return log_error_errno(r, "Failed to install SIGTERM handler: %m");
1401
1402         r = connect_bus(&context, event, &bus);
1403         if (r < 0)
1404                 return r;
1405
1406         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
1407         if (r < 0)
1408                 return log_error_errno(r, "Failed to run event loop: %m");
1409
1410         return 0;
1411 }
1412
1413 DEFINE_MAIN_FUNCTION(run);