src/hostname/hostnamed.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <sys/utsname.h>
  26
  27 #include "util.h"
  28 #include "strv.h"
  29 #include "def.h"
  30 #include "virt.h"
  31 #include "env-util.h"
  32 #include "fileio-label.h"
  33 #include "bus-util.h"
  34 #include "event-util.h"
  35 #include "selinux-util.h"
  36 #include "hostname-util.h"
  37
  38 #define VALID_DEPLOYMENT_CHARS (DIGITS LETTERS "-.:")
  39
  40 enum {
  41         PROP_HOSTNAME,
  42         PROP_STATIC_HOSTNAME,
  43         PROP_PRETTY_HOSTNAME,
  44         PROP_ICON_NAME,
  45         PROP_CHASSIS,
  46         PROP_DEPLOYMENT,
  47         PROP_LOCATION,
  48         PROP_KERNEL_NAME,
  49         PROP_KERNEL_RELEASE,
  50         PROP_KERNEL_VERSION,
  51         PROP_OS_PRETTY_NAME,
  52         PROP_OS_CPE_NAME,
  53         _PROP_MAX
  54 };
  55
  56 typedef struct Context {
  57         char *data[_PROP_MAX];
  58         Hashmap *polkit_registry;
  59 } Context;
  60
  61 static void context_reset(Context *c) {
  62         int p;
  63
  64         assert(c);
  65
  66         for (p = 0; p < _PROP_MAX; p++) {
  67                 free(c->data[p]);
  68                 c->data[p] = NULL;
  69         }
  70 }
  71
  72 static void context_free(Context *c) {
  73         assert(c);
  74
  75         context_reset(c);
  76         bus_verify_polkit_async_registry_free(c->polkit_registry);
  77 }
  78
  79 static int context_read_data(Context *c) {
  80         int r;
  81         struct utsname u;
  82
  83         assert(c);
  84
  85         context_reset(c);
  86
  87         assert_se(uname(&u) >= 0);
  88         c->data[PROP_KERNEL_NAME] = strdup(u.sysname);
  89         c->data[PROP_KERNEL_RELEASE] = strdup(u.release);
  90         c->data[PROP_KERNEL_VERSION] = strdup(u.version);
  91         if (!c->data[PROP_KERNEL_NAME] || !c->data[PROP_KERNEL_RELEASE] ||
  92             !c->data[PROP_KERNEL_VERSION])
  93                 return -ENOMEM;
  94
  95         c->data[PROP_HOSTNAME] = gethostname_malloc();
  96         if (!c->data[PROP_HOSTNAME])
  97                 return -ENOMEM;
  98
  99         r = read_hostname_config("/etc/hostname", &c->data[PROP_STATIC_HOSTNAME]);
 100         if (r < 0 && r != -ENOENT)
 101                 return r;
 102
 103         r = parse_env_file("/etc/machine-info", NEWLINE,
 104                            "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
 105                            "ICON_NAME", &c->data[PROP_ICON_NAME],
 106                            "CHASSIS", &c->data[PROP_CHASSIS],
 107                            "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
 108                            "LOCATION", &c->data[PROP_LOCATION],
 109                            NULL);
 110         if (r < 0 && r != -ENOENT)
 111                 return r;
 112
 113         r = parse_env_file("/etc/os-release", NEWLINE,
 114                            "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
 115                            "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
 116                            NULL);
 117         if (r == -ENOENT) {
 118                 r = parse_env_file("/usr/lib/os-release", NEWLINE,
 119                                    "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
 120                                    "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
 121                                    NULL);
 122         }
 123
 124         if (r < 0 && r != -ENOENT)
 125                 return r;
 126
 127         return 0;
 128 }
 129
 130 static bool valid_chassis(const char *chassis) {
 131         assert(chassis);
 132
 133         return nulstr_contains(
 134                         "vm\0"
 135                         "container\0"
 136                         "desktop\0"
 137                         "laptop\0"
 138                         "server\0"
 139                         "tablet\0"
 140                         "handset\0"
 141                         "watch\0"
 142                         "embedded\0",
 143                         chassis);
 144 }
 145
 146 static bool valid_deployment(const char *deployment) {
 147         assert(deployment);
 148
 149         return in_charset(deployment, VALID_DEPLOYMENT_CHARS);
 150 }
 151
 152 static const char* fallback_chassis(void) {
 153         int r;
 154         char *type;
 155         unsigned t;
 156         int v;
 157
 158         v = detect_virtualization(NULL);
 159
 160         if (v == VIRTUALIZATION_VM)
 161                 return "vm";
 162         if (v == VIRTUALIZATION_CONTAINER)
 163                 return "container";
 164
 165         r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);
 166         if (r < 0)
 167                 goto try_dmi;
 168
 169         r = safe_atou(type, &t);
 170         free(type);
 171         if (r < 0)
 172                 goto try_dmi;
 173
 174         /* We only list the really obvious cases here as the ACPI data
 175          * is not really super reliable.
 176          *
 177          * See the ACPI 5.0 Spec Section 5.2.9.1 for details:
 178          *
 179          * http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
 180          */
 181
 182         switch(t) {
 183
 184         case 1:
 185         case 3:
 186         case 6:
 187                 return "desktop";
 188
 189         case 2:
 190                 return "laptop";
 191
 192         case 4:
 193         case 5:
 194         case 7:
 195                 return "server";
 196
 197         case 8:
 198                 return "tablet";
 199         }
 200
 201 try_dmi:
 202         r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
 203         if (r < 0)
 204                 return NULL;
 205
 206         r = safe_atou(type, &t);
 207         free(type);
 208         if (r < 0)
 209                 return NULL;
 210
 211         /* We only list the really obvious cases here. The DMI data is
 212            unreliable enough, so let's not do any additional guesswork
 213            on top of that.
 214
 215            See the SMBIOS Specification 2.7.1 section 7.4.1 for
 216            details about the values listed here:
 217
 218            http://www.dmtf.org/sites/default/files/standards/documents/DSP0134_2.7.1.pdf
 219          */
 220
 221         switch (t) {
 222
 223         case 0x3:
 224         case 0x4:
 225         case 0x6:
 226         case 0x7:
 227                 return "desktop";
 228
 229         case 0x8:
 230         case 0x9:
 231         case 0xA:
 232         case 0xE:
 233                 return "laptop";
 234
 235         case 0xB:
 236                 return "handset";
 237
 238         case 0x11:
 239         case 0x1C:
 240                 return "server";
 241         }
 242
 243         return NULL;
 244 }
 245
 246 static char* context_fallback_icon_name(Context *c) {
 247         const char *chassis;
 248
 249         assert(c);
 250
 251         if (!isempty(c->data[PROP_CHASSIS]))
 252                 return strappend("computer-", c->data[PROP_CHASSIS]);
 253
 254         chassis = fallback_chassis();
 255         if (chassis)
 256                 return strappend("computer-", chassis);
 257
 258         return strdup("computer");
 259 }
 260
 261
 262 static bool hostname_is_useful(const char *hn) {
 263         return !isempty(hn) && !is_localhost(hn);
 264 }
 265
 266 static int context_update_kernel_hostname(Context *c) {
 267         const char *static_hn;
 268         const char *hn;
 269
 270         assert(c);
 271
 272         static_hn = c->data[PROP_STATIC_HOSTNAME];
 273
 274         /* /etc/hostname with something other than "localhost"
 275          * has the highest preference ... */
 276         if (hostname_is_useful(static_hn))
 277                 hn = static_hn;
 278
 279         /* ... the transient host name, (ie: DHCP) comes next ... */
 280         else if (!isempty(c->data[PROP_HOSTNAME]))
 281                 hn = c->data[PROP_HOSTNAME];
 282
 283         /* ... fallback to static "localhost.*" ignored above ... */
 284         else if (!isempty(static_hn))
 285                 hn = static_hn;
 286
 287         /* ... and the ultimate fallback */
 288         else
 289                 hn = "localhost";
 290
 291         if (sethostname_idempotent(hn) < 0)
 292                 return -errno;
 293
 294         return 0;
 295 }
 296
 297 static int context_write_data_static_hostname(Context *c) {
 298
 299         assert(c);
 300
 301         if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
 302
 303                 if (unlink("/etc/hostname") < 0)
 304                         return errno == ENOENT ? 0 : -errno;
 305
 306                 return 0;
 307         }
 308         return write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
 309 }
 310
 311 static int context_write_data_machine_info(Context *c) {
 312
 313         static const char * const name[_PROP_MAX] = {
 314                 [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
 315                 [PROP_ICON_NAME] = "ICON_NAME",
 316                 [PROP_CHASSIS] = "CHASSIS",
 317                 [PROP_DEPLOYMENT] = "DEPLOYMENT",
 318                 [PROP_LOCATION] = "LOCATION",
 319         };
 320
 321         _cleanup_strv_free_ char **l = NULL;
 322         int r, p;
 323
 324         assert(c);
 325
 326         r = load_env_file(NULL, "/etc/machine-info", NULL, &l);
 327         if (r < 0 && r != -ENOENT)
 328                 return r;
 329
 330         for (p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
 331                 _cleanup_free_ char *t = NULL;
 332                 char **u;
 333
 334                 assert(name[p]);
 335
 336                 if (isempty(c->data[p]))  {
 337                         strv_env_unset(l, name[p]);
 338                         continue;
 339                 }
 340
 341                 t = strjoin(name[p], "=", c->data[p], NULL);
 342                 if (!t)
 343                         return -ENOMEM;
 344
 345                 u = strv_env_set(l, t);
 346                 if (!u)
 347                         return -ENOMEM;
 348
 349                 strv_free(l);
 350                 l = u;
 351         }
 352
 353         if (strv_isempty(l)) {
 354                 if (unlink("/etc/machine-info") < 0)
 355                         return errno == ENOENT ? 0 : -errno;
 356
 357                 return 0;
 358         }
 359
 360         return write_env_file_label("/etc/machine-info", l);
 361 }
 362
 363 static int property_get_icon_name(
 364                 sd_bus *bus,
 365                 const char *path,
 366                 const char *interface,
 367                 const char *property,
 368                 sd_bus_message *reply,
 369                 void *userdata,
 370                 sd_bus_error *error) {
 371
 372         _cleanup_free_ char *n = NULL;
 373         Context *c = userdata;
 374         const char *name;
 375
 376         if (isempty(c->data[PROP_ICON_NAME]))
 377                 name = n = context_fallback_icon_name(c);
 378         else
 379                 name = c->data[PROP_ICON_NAME];
 380
 381         if (!name)
 382                 return -ENOMEM;
 383
 384         return sd_bus_message_append(reply, "s", name);
 385 }
 386
 387 static int property_get_chassis(
 388                 sd_bus *bus,
 389                 const char *path,
 390                 const char *interface,
 391                 const char *property,
 392                 sd_bus_message *reply,
 393                 void *userdata,
 394                 sd_bus_error *error) {
 395
 396         Context *c = userdata;
 397         const char *name;
 398
 399         if (isempty(c->data[PROP_CHASSIS]))
 400                 name = fallback_chassis();
 401         else
 402                 name = c->data[PROP_CHASSIS];
 403
 404         return sd_bus_message_append(reply, "s", name);
 405 }
 406
 407 static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 408         Context *c = userdata;
 409         const char *name;
 410         int interactive;
 411         char *h;
 412         int r;
 413
 414         assert(m);
 415         assert(c);
 416
 417         r = sd_bus_message_read(m, "sb", &name, &interactive);
 418         if (r < 0)
 419                 return r;
 420
 421         if (isempty(name))
 422                 name = c->data[PROP_STATIC_HOSTNAME];
 423
 424         if (isempty(name))
 425                 name = "localhost";
 426
 427         if (!hostname_is_valid(name))
 428                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
 429
 430         if (streq_ptr(name, c->data[PROP_HOSTNAME]))
 431                 return sd_bus_reply_method_return(m, NULL);
 432
 433         r = bus_verify_polkit_async(
 434                         m,
 435                         CAP_SYS_ADMIN,
 436                         "org.freedesktop.hostname1.set-hostname",
 437                         interactive,
 438                         UID_INVALID,
 439                         &c->polkit_registry,
 440                         error);
 441         if (r < 0)
 442                 return r;
 443         if (r == 0)
 444                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 445
 446         h = strdup(name);
 447         if (!h)
 448                 return -ENOMEM;
 449
 450         free(c->data[PROP_HOSTNAME]);
 451         c->data[PROP_HOSTNAME] = h;
 452
 453         r = context_update_kernel_hostname(c);
 454         if (r < 0) {
 455                 log_error_errno(r, "Failed to set host name: %m");
 456                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
 457         }
 458
 459         log_info("Changed host name to '%s'", strna(c->data[PROP_HOSTNAME]));
 460
 461         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "Hostname", NULL);
 462
 463         return sd_bus_reply_method_return(m, NULL);
 464 }
 465
 466 static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 467         Context *c = userdata;
 468         const char *name;
 469         int interactive;
 470         int r;
 471
 472         assert(m);
 473         assert(c);
 474
 475         r = sd_bus_message_read(m, "sb", &name, &interactive);
 476         if (r < 0)
 477                 return r;
 478
 479         if (isempty(name))
 480                 name = NULL;
 481
 482         if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
 483                 return sd_bus_reply_method_return(m, NULL);
 484
 485         r = bus_verify_polkit_async(
 486                         m,
 487                         CAP_SYS_ADMIN,
 488                         "org.freedesktop.hostname1.set-static-hostname",
 489                         interactive,
 490                         UID_INVALID,
 491                         &c->polkit_registry,
 492                         error);
 493         if (r < 0)
 494                 return r;
 495         if (r == 0)
 496                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 497
 498         if (isempty(name)) {
 499                 free(c->data[PROP_STATIC_HOSTNAME]);
 500                 c->data[PROP_STATIC_HOSTNAME] = NULL;
 501         } else {
 502                 char *h;
 503
 504                 if (!hostname_is_valid(name))
 505                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
 506
 507                 h = strdup(name);
 508                 if (!h)
 509                         return -ENOMEM;
 510
 511                 free(c->data[PROP_STATIC_HOSTNAME]);
 512                 c->data[PROP_STATIC_HOSTNAME] = h;
 513         }
 514
 515         r = context_update_kernel_hostname(c);
 516         if (r < 0) {
 517                 log_error_errno(r, "Failed to set host name: %m");
 518                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
 519         }
 520
 521         r = context_write_data_static_hostname(c);
 522         if (r < 0) {
 523                 log_error_errno(r, "Failed to write static host name: %m");
 524                 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %s", strerror(-r));
 525         }
 526
 527         log_info("Changed static host name to '%s'", strna(c->data[PROP_STATIC_HOSTNAME]));
 528
 529         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "StaticHostname", NULL);
 530
 531         return sd_bus_reply_method_return(m, NULL);
 532 }
 533
 534 static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
 535         int interactive;
 536         const char *name;
 537         int r;
 538
 539         assert(c);
 540         assert(m);
 541
 542         r = sd_bus_message_read(m, "sb", &name, &interactive);
 543         if (r < 0)
 544                 return r;
 545
 546         if (isempty(name))
 547                 name = NULL;
 548
 549         if (streq_ptr(name, c->data[prop]))
 550                 return sd_bus_reply_method_return(m, NULL);
 551
 552         /* Since the pretty hostname should always be changed at the
 553          * same time as the static one, use the same policy action for
 554          * both... */
 555
 556         r = bus_verify_polkit_async(
 557                         m,
 558                         CAP_SYS_ADMIN,
 559                         prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
 560                         interactive,
 561                         UID_INVALID,
 562                         &c->polkit_registry,
 563                         error);
 564         if (r < 0)
 565                 return r;
 566         if (r == 0)
 567                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 568
 569         if (isempty(name)) {
 570                 free(c->data[prop]);
 571                 c->data[prop] = NULL;
 572         } else {
 573                 char *h;
 574
 575                 /* The icon name might ultimately be used as file
 576                  * name, so better be safe than sorry */
 577
 578                 if (prop == PROP_ICON_NAME && !filename_is_valid(name))
 579                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
 580                 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
 581                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty host name '%s'", name);
 582                 if (prop == PROP_CHASSIS && !valid_chassis(name))
 583                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
 584                 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
 585                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
 586                 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
 587                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
 588
 589                 h = strdup(name);
 590                 if (!h)
 591                         return -ENOMEM;
 592
 593                 free(c->data[prop]);
 594                 c->data[prop] = h;
 595         }
 596
 597         r = context_write_data_machine_info(c);
 598         if (r < 0) {
 599                 log_error_errno(r, "Failed to write machine info: %m");
 600                 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %s", strerror(-r));
 601         }
 602
 603         log_info("Changed %s to '%s'",
 604                  prop == PROP_PRETTY_HOSTNAME ? "pretty host name" :
 605                  prop == PROP_DEPLOYMENT ? "deployment" :
 606                  prop == PROP_LOCATION ? "location" :
 607                  prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
 608
 609         (void) sd_bus_emit_properties_changed(
 610                         sd_bus_message_get_bus(m),
 611                         "/org/freedesktop/hostname1",
 612                         "org.freedesktop.hostname1",
 613                         prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
 614                         prop == PROP_DEPLOYMENT ? "Deployment" :
 615                         prop == PROP_LOCATION ? "Location" :
 616                         prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
 617
 618         return sd_bus_reply_method_return(m, NULL);
 619 }
 620
 621 static int method_set_pretty_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 622         return set_machine_info(userdata, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
 623 }
 624
 625 static int method_set_icon_name(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 626         return set_machine_info(userdata, m, PROP_ICON_NAME, method_set_icon_name, error);
 627 }
 628
 629 static int method_set_chassis(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 630         return set_machine_info(userdata, m, PROP_CHASSIS, method_set_chassis, error);
 631 }
 632
 633 static int method_set_deployment(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 634         return set_machine_info(userdata, m, PROP_DEPLOYMENT, method_set_deployment, error);
 635 }
 636
 637 static int method_set_location(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 638         return set_machine_info(userdata, m, PROP_LOCATION, method_set_location, error);
 639 }
 640
 641 static const sd_bus_vtable hostname_vtable[] = {
 642         SD_BUS_VTABLE_START(0),
 643         SD_BUS_PROPERTY("Hostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 644         SD_BUS_PROPERTY("StaticHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_STATIC_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 645         SD_BUS_PROPERTY("PrettyHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 646         SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 647         SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 648         SD_BUS_PROPERTY("Deployment", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 649         SD_BUS_PROPERTY("Location", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 650         SD_BUS_PROPERTY("KernelName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
 651         SD_BUS_PROPERTY("KernelRelease", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_RELEASE, SD_BUS_VTABLE_PROPERTY_CONST),
 652         SD_BUS_PROPERTY("KernelVersion", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_VERSION, SD_BUS_VTABLE_PROPERTY_CONST),
 653         SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
 654         SD_BUS_PROPERTY("OperatingSystemCPEName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
 655         SD_BUS_METHOD("SetHostname", "sb", NULL, method_set_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
 656         SD_BUS_METHOD("SetStaticHostname", "sb", NULL, method_set_static_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
 657         SD_BUS_METHOD("SetPrettyHostname", "sb", NULL, method_set_pretty_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
 658         SD_BUS_METHOD("SetIconName", "sb", NULL, method_set_icon_name, SD_BUS_VTABLE_UNPRIVILEGED),
 659         SD_BUS_METHOD("SetChassis", "sb", NULL, method_set_chassis, SD_BUS_VTABLE_UNPRIVILEGED),
 660         SD_BUS_METHOD("SetDeployment", "sb", NULL, method_set_deployment, SD_BUS_VTABLE_UNPRIVILEGED),
 661         SD_BUS_METHOD("SetLocation", "sb", NULL, method_set_location, SD_BUS_VTABLE_UNPRIVILEGED),
 662         SD_BUS_VTABLE_END,
 663 };
 664
 665 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
 666         _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
 667         int r;
 668
 669         assert(c);
 670         assert(event);
 671         assert(_bus);
 672
 673         r = sd_bus_default_system(&bus);
 674         if (r < 0)
 675                 return log_error_errno(r, "Failed to get system bus connection: %m");
 676
 677         r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", hostname_vtable, c);
 678         if (r < 0)
 679                 return log_error_errno(r, "Failed to register object: %m");
 680
 681         r = sd_bus_request_name(bus, "org.freedesktop.hostname1", 0);
 682         if (r < 0)
 683                 return log_error_errno(r, "Failed to register name: %m");
 684
 685         r = sd_bus_attach_event(bus, event, 0);
 686         if (r < 0)
 687                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 688
 689         *_bus = bus;
 690         bus = NULL;
 691
 692         return 0;
 693 }
 694
 695 int main(int argc, char *argv[]) {
 696         Context context = {};
 697         _cleanup_event_unref_ sd_event *event = NULL;
 698         _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
 699         int r;
 700
 701         log_set_target(LOG_TARGET_AUTO);
 702         log_parse_environment();
 703         log_open();
 704
 705         umask(0022);
 706         mac_selinux_init("/etc");
 707
 708         if (argc != 1) {
 709                 log_error("This program takes no arguments.");
 710                 r = -EINVAL;
 711                 goto finish;
 712         }
 713
 714         if (argc != 1) {
 715                 log_error("This program takes no arguments.");
 716                 r = -EINVAL;
 717                 goto finish;
 718         }
 719
 720         r = sd_event_default(&event);
 721         if (r < 0) {
 722                 log_error_errno(r, "Failed to allocate event loop: %m");
 723                 goto finish;
 724         }
 725
 726         sd_event_set_watchdog(event, true);
 727
 728         r = connect_bus(&context, event, &bus);
 729         if (r < 0)
 730                 goto finish;
 731
 732         r = context_read_data(&context);
 733         if (r < 0) {
 734                 log_error_errno(r, "Failed to read hostname and machine information: %m");
 735                 goto finish;
 736         }
 737
 738         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
 739         if (r < 0) {
 740                 log_error_errno(r, "Failed to run event loop: %m");
 741                 goto finish;
 742         }
 743
 744 finish:
 745         context_free(&context);
 746
 747         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 748 }