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 #include <sys/capability.h>
  27
  28 #include "util.h"
  29 #include "strv.h"
  30 #include "def.h"
  31 #include "virt.h"
  32 #include "env-util.h"
  33 #include "fileio-label.h"
  34 #include "label.h"
  35 #include "bus-util.h"
  36 #include "event-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_one_line_file("/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 *bus, 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         r = sd_bus_message_read(m, "sb", &name, &interactive);
 415         if (r < 0)
 416                 return r;
 417
 418         if (isempty(name))
 419                 name = c->data[PROP_STATIC_HOSTNAME];
 420
 421         if (isempty(name))
 422                 name = "localhost";
 423
 424         if (!hostname_is_valid(name))
 425                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
 426
 427         if (streq_ptr(name, c->data[PROP_HOSTNAME]))
 428                 return sd_bus_reply_method_return(m, NULL);
 429
 430         r = bus_verify_polkit_async(m, CAP_SYS_ADMIN, "org.freedesktop.hostname1.set-hostname", interactive, &c->polkit_registry, error);
 431         if (r < 0)
 432                 return r;
 433         if (r == 0)
 434                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 435
 436         h = strdup(name);
 437         if (!h)
 438                 return -ENOMEM;
 439
 440         free(c->data[PROP_HOSTNAME]);
 441         c->data[PROP_HOSTNAME] = h;
 442
 443         r = context_update_kernel_hostname(c);
 444         if (r < 0) {
 445                 log_error_errno(r, "Failed to set host name: %m");
 446                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
 447         }
 448
 449         log_info("Changed host name to '%s'", strna(c->data[PROP_HOSTNAME]));
 450
 451         sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "Hostname", NULL);
 452
 453         return sd_bus_reply_method_return(m, NULL);
 454 }
 455
 456 static int method_set_static_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 457         Context *c = userdata;
 458         const char *name;
 459         int interactive;
 460         int r;
 461
 462         r = sd_bus_message_read(m, "sb", &name, &interactive);
 463         if (r < 0)
 464                 return r;
 465
 466         if (isempty(name))
 467                 name = NULL;
 468
 469         if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
 470                 return sd_bus_reply_method_return(m, NULL);
 471
 472         r = bus_verify_polkit_async(m, CAP_SYS_ADMIN, "org.freedesktop.hostname1.set-static-hostname", interactive, &c->polkit_registry, error);
 473         if (r < 0)
 474                 return r;
 475         if (r == 0)
 476                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 477
 478         if (isempty(name)) {
 479                 free(c->data[PROP_STATIC_HOSTNAME]);
 480                 c->data[PROP_STATIC_HOSTNAME] = NULL;
 481         } else {
 482                 char *h;
 483
 484                 if (!hostname_is_valid(name))
 485                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
 486
 487                 h = strdup(name);
 488                 if (!h)
 489                         return -ENOMEM;
 490
 491                 free(c->data[PROP_STATIC_HOSTNAME]);
 492                 c->data[PROP_STATIC_HOSTNAME] = h;
 493         }
 494
 495         r = context_update_kernel_hostname(c);
 496         if (r < 0) {
 497                 log_error_errno(r, "Failed to set host name: %m");
 498                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
 499         }
 500
 501         r = context_write_data_static_hostname(c);
 502         if (r < 0) {
 503                 log_error_errno(r, "Failed to write static host name: %m");
 504                 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %s", strerror(-r));
 505         }
 506
 507         log_info("Changed static host name to '%s'", strna(c->data[PROP_STATIC_HOSTNAME]));
 508
 509         sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "StaticHostname", NULL);
 510
 511         return sd_bus_reply_method_return(m, NULL);
 512 }
 513
 514 static int set_machine_info(Context *c, sd_bus *bus, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
 515         int interactive;
 516         const char *name;
 517         int r;
 518
 519         assert(c);
 520         assert(bus);
 521         assert(m);
 522
 523         r = sd_bus_message_read(m, "sb", &name, &interactive);
 524         if (r < 0)
 525                 return r;
 526
 527         if (isempty(name))
 528                 name = NULL;
 529
 530         if (streq_ptr(name, c->data[prop]))
 531                 return sd_bus_reply_method_return(m, NULL);
 532
 533         /* Since the pretty hostname should always be changed at the
 534          * same time as the static one, use the same policy action for
 535          * both... */
 536
 537         r = bus_verify_polkit_async(m, CAP_SYS_ADMIN,
 538                                     prop == PROP_PRETTY_HOSTNAME ?
 539                                     "org.freedesktop.hostname1.set-static-hostname" :
 540                                     "org.freedesktop.hostname1.set-machine-info", interactive, &c->polkit_registry, error);
 541         if (r < 0)
 542                 return r;
 543         if (r == 0)
 544                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 545
 546         if (isempty(name)) {
 547                 free(c->data[prop]);
 548                 c->data[prop] = NULL;
 549         } else {
 550                 char *h;
 551
 552                 /* The icon name might ultimately be used as file
 553                  * name, so better be safe than sorry */
 554
 555                 if (prop == PROP_ICON_NAME && !filename_is_safe(name))
 556                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
 557                 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
 558                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty host name '%s'", name);
 559                 if (prop == PROP_CHASSIS && !valid_chassis(name))
 560                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
 561                 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
 562                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
 563                 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
 564                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
 565
 566                 h = strdup(name);
 567                 if (!h)
 568                         return -ENOMEM;
 569
 570                 free(c->data[prop]);
 571                 c->data[prop] = h;
 572         }
 573
 574         r = context_write_data_machine_info(c);
 575         if (r < 0) {
 576                 log_error_errno(r, "Failed to write machine info: %m");
 577                 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %s", strerror(-r));
 578         }
 579
 580         log_info("Changed %s to '%s'",
 581                  prop == PROP_PRETTY_HOSTNAME ? "pretty host name" :
 582                  prop == PROP_DEPLOYMENT ? "deployment" :
 583                  prop == PROP_LOCATION ? "location" :
 584                  prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
 585
 586         sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
 587                                        prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
 588                                        prop == PROP_DEPLOYMENT ? "Deployment" :
 589                                        prop == PROP_LOCATION ? "Location" :
 590                                        prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
 591
 592         return sd_bus_reply_method_return(m, NULL);
 593 }
 594
 595 static int method_set_pretty_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 596         return set_machine_info(userdata, bus, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
 597 }
 598
 599 static int method_set_icon_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 600         return set_machine_info(userdata, bus, m, PROP_ICON_NAME, method_set_icon_name, error);
 601 }
 602
 603 static int method_set_chassis(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 604         return set_machine_info(userdata, bus, m, PROP_CHASSIS, method_set_chassis, error);
 605 }
 606
 607 static int method_set_deployment(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 608         return set_machine_info(userdata, bus, m, PROP_DEPLOYMENT, method_set_deployment, error);
 609 }
 610
 611 static int method_set_location(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
 612         return set_machine_info(userdata, bus, m, PROP_LOCATION, method_set_location, error);
 613 }
 614
 615 static const sd_bus_vtable hostname_vtable[] = {
 616         SD_BUS_VTABLE_START(0),
 617         SD_BUS_PROPERTY("Hostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 618         SD_BUS_PROPERTY("StaticHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_STATIC_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 619         SD_BUS_PROPERTY("PrettyHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 620         SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 621         SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 622         SD_BUS_PROPERTY("Deployment", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 623         SD_BUS_PROPERTY("Location", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 624         SD_BUS_PROPERTY("KernelName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
 625         SD_BUS_PROPERTY("KernelRelease", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_RELEASE, SD_BUS_VTABLE_PROPERTY_CONST),
 626         SD_BUS_PROPERTY("KernelVersion", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_VERSION, SD_BUS_VTABLE_PROPERTY_CONST),
 627         SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
 628         SD_BUS_PROPERTY("OperatingSystemCPEName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
 629         SD_BUS_METHOD("SetHostname", "sb", NULL, method_set_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
 630         SD_BUS_METHOD("SetStaticHostname", "sb", NULL, method_set_static_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
 631         SD_BUS_METHOD("SetPrettyHostname", "sb", NULL, method_set_pretty_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
 632         SD_BUS_METHOD("SetIconName", "sb", NULL, method_set_icon_name, SD_BUS_VTABLE_UNPRIVILEGED),
 633         SD_BUS_METHOD("SetChassis", "sb", NULL, method_set_chassis, SD_BUS_VTABLE_UNPRIVILEGED),
 634         SD_BUS_METHOD("SetDeployment", "sb", NULL, method_set_deployment, SD_BUS_VTABLE_UNPRIVILEGED),
 635         SD_BUS_METHOD("SetLocation", "sb", NULL, method_set_location, SD_BUS_VTABLE_UNPRIVILEGED),
 636         SD_BUS_VTABLE_END,
 637 };
 638
 639 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
 640         _cleanup_bus_close_unref_ sd_bus *bus = NULL;
 641         int r;
 642
 643         assert(c);
 644         assert(event);
 645         assert(_bus);
 646
 647         r = sd_bus_default_system(&bus);
 648         if (r < 0)
 649                 return log_error_errno(r, "Failed to get system bus connection: %m");
 650
 651         r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", hostname_vtable, c);
 652         if (r < 0)
 653                 return log_error_errno(r, "Failed to register object: %m");
 654
 655         r = sd_bus_request_name(bus, "org.freedesktop.hostname1", 0);
 656         if (r < 0)
 657                 return log_error_errno(r, "Failed to register name: %m");
 658
 659         r = sd_bus_attach_event(bus, event, 0);
 660         if (r < 0)
 661                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 662
 663         *_bus = bus;
 664         bus = NULL;
 665
 666         return 0;
 667 }
 668
 669 int main(int argc, char *argv[]) {
 670         Context context = {};
 671         _cleanup_event_unref_ sd_event *event = NULL;
 672         _cleanup_bus_close_unref_ sd_bus *bus = NULL;
 673         int r;
 674
 675         log_set_target(LOG_TARGET_AUTO);
 676         log_parse_environment();
 677         log_open();
 678
 679         umask(0022);
 680         mac_selinux_init("/etc");
 681
 682         if (argc != 1) {
 683                 log_error("This program takes no arguments.");
 684                 r = -EINVAL;
 685                 goto finish;
 686         }
 687
 688         if (argc != 1) {
 689                 log_error("This program takes no arguments.");
 690                 r = -EINVAL;
 691                 goto finish;
 692         }
 693
 694         r = sd_event_default(&event);
 695         if (r < 0) {
 696                 log_error_errno(r, "Failed to allocate event loop: %m");
 697                 goto finish;
 698         }
 699
 700         sd_event_set_watchdog(event, true);
 701
 702         r = connect_bus(&context, event, &bus);
 703         if (r < 0)
 704                 goto finish;
 705
 706         r = context_read_data(&context);
 707         if (r < 0) {
 708                 log_error_errno(r, "Failed to read hostname and machine information: %m");
 709                 goto finish;
 710         }
 711
 712         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
 713         if (r < 0) {
 714                 log_error_errno(r, "Failed to run event loop: %m");
 715                 goto finish;
 716         }
 717
 718 finish:
 719         context_free(&context);
 720
 721         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 722 }