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 <sys/utsname.h>
  25 #include <unistd.h>
  26
  27 #include "alloc-util.h"
  28 #include "bus-util.h"
  29 #include "def.h"
  30 #include "env-util.h"
  31 #include "fileio-label.h"
  32 #include "hostname-util.h"
  33 #include "parse-util.h"
  34 #include "path-util.h"
  35 #include "selinux-util.h"
  36 #include "strv.h"
  37 #include "user-util.h"
  38 #include "util.h"
  39 #include "virt.h"
  40
  41 #define VALID_DEPLOYMENT_CHARS (DIGITS LETTERS "-.:")
  42
  43 enum {
  44         PROP_HOSTNAME,
  45         PROP_STATIC_HOSTNAME,
  46         PROP_PRETTY_HOSTNAME,
  47         PROP_ICON_NAME,
  48         PROP_CHASSIS,
  49         PROP_DEPLOYMENT,
  50         PROP_LOCATION,
  51         PROP_KERNEL_NAME,
  52         PROP_KERNEL_RELEASE,
  53         PROP_KERNEL_VERSION,
  54         PROP_OS_PRETTY_NAME,
  55         PROP_OS_CPE_NAME,
  56         _PROP_MAX
  57 };
  58
  59 typedef struct Context {
  60         char *data[_PROP_MAX];
  61         Hashmap *polkit_registry;
  62 } Context;
  63
  64 static void context_reset(Context *c) {
  65         int p;
  66
  67         assert(c);
  68
  69         for (p = 0; p < _PROP_MAX; p++)
  70                 c->data[p] = mfree(c->data[p]);
  71 }
  72
  73 static void context_free(Context *c) {
  74         assert(c);
  75
  76         context_reset(c);
  77         bus_verify_polkit_async_registry_free(c->polkit_registry);
  78 }
  79
  80 static int context_read_data(Context *c) {
  81         int r;
  82         struct utsname u;
  83
  84         assert(c);
  85
  86         context_reset(c);
  87
  88         assert_se(uname(&u) >= 0);
  89         c->data[PROP_KERNEL_NAME] = strdup(u.sysname);
  90         c->data[PROP_KERNEL_RELEASE] = strdup(u.release);
  91         c->data[PROP_KERNEL_VERSION] = strdup(u.version);
  92         if (!c->data[PROP_KERNEL_NAME] || !c->data[PROP_KERNEL_RELEASE] ||
  93             !c->data[PROP_KERNEL_VERSION])
  94                 return -ENOMEM;
  95
  96         c->data[PROP_HOSTNAME] = gethostname_malloc();
  97         if (!c->data[PROP_HOSTNAME])
  98                 return -ENOMEM;
  99
 100         r = read_hostname_config("/etc/hostname", &c->data[PROP_STATIC_HOSTNAME]);
 101         if (r < 0 && r != -ENOENT)
 102                 return r;
 103
 104         r = parse_env_file("/etc/machine-info", NEWLINE,
 105                            "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
 106                            "ICON_NAME", &c->data[PROP_ICON_NAME],
 107                            "CHASSIS", &c->data[PROP_CHASSIS],
 108                            "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
 109                            "LOCATION", &c->data[PROP_LOCATION],
 110                            NULL);
 111         if (r < 0 && r != -ENOENT)
 112                 return r;
 113
 114         r = parse_env_file("/etc/os-release", NEWLINE,
 115                            "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
 116                            "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
 117                            NULL);
 118         if (r == -ENOENT)
 119                 r = parse_env_file("/usr/lib/os-release", NEWLINE,
 120                                    "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
 121                                    "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
 122                                    NULL);
 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();
 159
 160         if (VIRTUALIZATION_IS_VM(v))
 161                 return "vm";
 162         if (VIRTUALIZATION_IS_CONTAINER(v))
 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, false))
 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                         NULL,
 438                         interactive,
 439                         UID_INVALID,
 440                         &c->polkit_registry,
 441                         error);
 442         if (r < 0)
 443                 return r;
 444         if (r == 0)
 445                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 446
 447         h = strdup(name);
 448         if (!h)
 449                 return -ENOMEM;
 450
 451         free(c->data[PROP_HOSTNAME]);
 452         c->data[PROP_HOSTNAME] = h;
 453
 454         r = context_update_kernel_hostname(c);
 455         if (r < 0) {
 456                 log_error_errno(r, "Failed to set host name: %m");
 457                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
 458         }
 459
 460         log_info("Changed host name to '%s'", strna(c->data[PROP_HOSTNAME]));
 461
 462         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "Hostname", NULL);
 463
 464         return sd_bus_reply_method_return(m, NULL);
 465 }
 466
 467 static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 468         Context *c = userdata;
 469         const char *name;
 470         int interactive;
 471         int r;
 472
 473         assert(m);
 474         assert(c);
 475
 476         r = sd_bus_message_read(m, "sb", &name, &interactive);
 477         if (r < 0)
 478                 return r;
 479
 480         if (isempty(name))
 481                 name = NULL;
 482
 483         if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
 484                 return sd_bus_reply_method_return(m, NULL);
 485
 486         r = bus_verify_polkit_async(
 487                         m,
 488                         CAP_SYS_ADMIN,
 489                         "org.freedesktop.hostname1.set-static-hostname",
 490                         NULL,
 491                         interactive,
 492                         UID_INVALID,
 493                         &c->polkit_registry,
 494                         error);
 495         if (r < 0)
 496                 return r;
 497         if (r == 0)
 498                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 499
 500         if (isempty(name)) {
 501                 c->data[PROP_STATIC_HOSTNAME] = mfree(c->data[PROP_STATIC_HOSTNAME]);
 502         } else {
 503                 char *h;
 504
 505                 if (!hostname_is_valid(name, false))
 506                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
 507
 508                 h = strdup(name);
 509                 if (!h)
 510                         return -ENOMEM;
 511
 512                 free(c->data[PROP_STATIC_HOSTNAME]);
 513                 c->data[PROP_STATIC_HOSTNAME] = h;
 514         }
 515
 516         r = context_update_kernel_hostname(c);
 517         if (r < 0) {
 518                 log_error_errno(r, "Failed to set host name: %m");
 519                 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
 520         }
 521
 522         r = context_write_data_static_hostname(c);
 523         if (r < 0) {
 524                 log_error_errno(r, "Failed to write static host name: %m");
 525                 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %s", strerror(-r));
 526         }
 527
 528         log_info("Changed static host name to '%s'", strna(c->data[PROP_STATIC_HOSTNAME]));
 529
 530         (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "StaticHostname", NULL);
 531
 532         return sd_bus_reply_method_return(m, NULL);
 533 }
 534
 535 static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
 536         int interactive;
 537         const char *name;
 538         int r;
 539
 540         assert(c);
 541         assert(m);
 542
 543         r = sd_bus_message_read(m, "sb", &name, &interactive);
 544         if (r < 0)
 545                 return r;
 546
 547         if (isempty(name))
 548                 name = NULL;
 549
 550         if (streq_ptr(name, c->data[prop]))
 551                 return sd_bus_reply_method_return(m, NULL);
 552
 553         /* Since the pretty hostname should always be changed at the
 554          * same time as the static one, use the same policy action for
 555          * both... */
 556
 557         r = bus_verify_polkit_async(
 558                         m,
 559                         CAP_SYS_ADMIN,
 560                         prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
 561                         NULL,
 562                         interactive,
 563                         UID_INVALID,
 564                         &c->polkit_registry,
 565                         error);
 566         if (r < 0)
 567                 return r;
 568         if (r == 0)
 569                 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
 570
 571         if (isempty(name)) {
 572                 c->data[prop] = mfree(c->data[prop]);
 573         } else {
 574                 char *h;
 575
 576                 /* The icon name might ultimately be used as file
 577                  * name, so better be safe than sorry */
 578
 579                 if (prop == PROP_ICON_NAME && !filename_is_valid(name))
 580                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
 581                 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
 582                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty host name '%s'", name);
 583                 if (prop == PROP_CHASSIS && !valid_chassis(name))
 584                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
 585                 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
 586                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
 587                 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
 588                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
 589
 590                 h = strdup(name);
 591                 if (!h)
 592                         return -ENOMEM;
 593
 594                 free(c->data[prop]);
 595                 c->data[prop] = h;
 596         }
 597
 598         r = context_write_data_machine_info(c);
 599         if (r < 0) {
 600                 log_error_errno(r, "Failed to write machine info: %m");
 601                 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %s", strerror(-r));
 602         }
 603
 604         log_info("Changed %s to '%s'",
 605                  prop == PROP_PRETTY_HOSTNAME ? "pretty host name" :
 606                  prop == PROP_DEPLOYMENT ? "deployment" :
 607                  prop == PROP_LOCATION ? "location" :
 608                  prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
 609
 610         (void) sd_bus_emit_properties_changed(
 611                         sd_bus_message_get_bus(m),
 612                         "/org/freedesktop/hostname1",
 613                         "org.freedesktop.hostname1",
 614                         prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
 615                         prop == PROP_DEPLOYMENT ? "Deployment" :
 616                         prop == PROP_LOCATION ? "Location" :
 617                         prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
 618
 619         return sd_bus_reply_method_return(m, NULL);
 620 }
 621
 622 static int method_set_pretty_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 623         return set_machine_info(userdata, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
 624 }
 625
 626 static int method_set_icon_name(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 627         return set_machine_info(userdata, m, PROP_ICON_NAME, method_set_icon_name, error);
 628 }
 629
 630 static int method_set_chassis(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 631         return set_machine_info(userdata, m, PROP_CHASSIS, method_set_chassis, error);
 632 }
 633
 634 static int method_set_deployment(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 635         return set_machine_info(userdata, m, PROP_DEPLOYMENT, method_set_deployment, error);
 636 }
 637
 638 static int method_set_location(sd_bus_message *m, void *userdata, sd_bus_error *error) {
 639         return set_machine_info(userdata, m, PROP_LOCATION, method_set_location, error);
 640 }
 641
 642 static const sd_bus_vtable hostname_vtable[] = {
 643         SD_BUS_VTABLE_START(0),
 644         SD_BUS_PROPERTY("Hostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 645         SD_BUS_PROPERTY("StaticHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_STATIC_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 646         SD_BUS_PROPERTY("PrettyHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 647         SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 648         SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 649         SD_BUS_PROPERTY("Deployment", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 650         SD_BUS_PROPERTY("Location", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 651         SD_BUS_PROPERTY("KernelName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
 652         SD_BUS_PROPERTY("KernelRelease", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_RELEASE, SD_BUS_VTABLE_PROPERTY_CONST),
 653         SD_BUS_PROPERTY("KernelVersion", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_VERSION, SD_BUS_VTABLE_PROPERTY_CONST),
 654         SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
 655         SD_BUS_PROPERTY("OperatingSystemCPEName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
 656         SD_BUS_METHOD("SetHostname", "sb", NULL, method_set_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
 657         SD_BUS_METHOD("SetStaticHostname", "sb", NULL, method_set_static_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
 658         SD_BUS_METHOD("SetPrettyHostname", "sb", NULL, method_set_pretty_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
 659         SD_BUS_METHOD("SetIconName", "sb", NULL, method_set_icon_name, SD_BUS_VTABLE_UNPRIVILEGED),
 660         SD_BUS_METHOD("SetChassis", "sb", NULL, method_set_chassis, SD_BUS_VTABLE_UNPRIVILEGED),
 661         SD_BUS_METHOD("SetDeployment", "sb", NULL, method_set_deployment, SD_BUS_VTABLE_UNPRIVILEGED),
 662         SD_BUS_METHOD("SetLocation", "sb", NULL, method_set_location, SD_BUS_VTABLE_UNPRIVILEGED),
 663         SD_BUS_VTABLE_END,
 664 };
 665
 666 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
 667         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 668         int r;
 669
 670         assert(c);
 671         assert(event);
 672         assert(_bus);
 673
 674         r = sd_bus_default_system(&bus);
 675         if (r < 0)
 676                 return log_error_errno(r, "Failed to get system bus connection: %m");
 677
 678         r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", hostname_vtable, c);
 679         if (r < 0)
 680                 return log_error_errno(r, "Failed to register object: %m");
 681
 682         r = sd_bus_request_name(bus, "org.freedesktop.hostname1", 0);
 683         if (r < 0)
 684                 return log_error_errno(r, "Failed to register name: %m");
 685
 686         r = sd_bus_attach_event(bus, event, 0);
 687         if (r < 0)
 688                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 689
 690         *_bus = bus;
 691         bus = NULL;
 692
 693         return 0;
 694 }
 695
 696 int main(int argc, char *argv[]) {
 697         Context context = {};
 698         _cleanup_(sd_event_unrefp) sd_event *event = NULL;
 699         _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 700         int r;
 701
 702         log_set_target(LOG_TARGET_AUTO);
 703         log_parse_environment();
 704         log_open();
 705
 706         umask(0022);
 707         mac_selinux_init("/etc");
 708
 709         if (argc != 1) {
 710                 log_error("This program takes no arguments.");
 711                 r = -EINVAL;
 712                 goto finish;
 713         }
 714
 715         r = sd_event_default(&event);
 716         if (r < 0) {
 717                 log_error_errno(r, "Failed to allocate event loop: %m");
 718                 goto finish;
 719         }
 720
 721         sd_event_set_watchdog(event, true);
 722
 723         r = connect_bus(&context, event, &bus);
 724         if (r < 0)
 725                 goto finish;
 726
 727         r = context_read_data(&context);
 728         if (r < 0) {
 729                 log_error_errno(r, "Failed to read hostname and machine information: %m");
 730                 goto finish;
 731         }
 732
 733         r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
 734         if (r < 0) {
 735                 log_error_errno(r, "Failed to run event loop: %m");
 736                 goto finish;
 737         }
 738
 739 finish:
 740         context_free(&context);
 741
 742         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 743 }