src/hostname/hostnamed.c

	hostnamed.c revision f3f4f0086ea45ce82658d5fd8a9a36f25685043f
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier/***
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  This file is part of systemd.
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  Copyright 2011 Lennart Poettering
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  systemd is free software; you can redistribute it and/or modify it
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  under the terms of the GNU Lesser General Public License as published by
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  the Free Software Foundation; either version 2.1 of the License, or
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  (at your option) any later version.
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  systemd is distributed in the hope that it will be useful, but
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  WITHOUT ANY WARRANTY; without even the implied warranty of
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  Lesser General Public License for more details.
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  You should have received a copy of the GNU Lesser General Public License
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier  along with systemd; If not, see <http://www.gnu.org/licenses/>.
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier***/
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include <errno.h>
0d39fa9c69b97a2ceb156053deef69c0866c2b97Lennart Poettering#include <string.h>
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include <sys/utsname.h>
0d39fa9c69b97a2ceb156053deef69c0866c2b97Lennart Poettering#include <unistd.h>
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "alloc-util.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "bus-util.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "def.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "env-util.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "fileio-label.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "hostname-util.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "parse-util.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "path-util.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "selinux-util.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "strv.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "user-util.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "util.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#include "virt.h"
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier#define VALID_DEPLOYMENT_CHARS (DIGITS LETTERS "-.:")
c1d630d5fd3c0b3307811d51f9840652e066a0f2Zbigniew Jędrzejewski-Szmek
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalierenum {
c1d630d5fd3c0b3307811d51f9840652e066a0f2Zbigniew Jędrzejewski-Szmek        PROP_HOSTNAME,
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier        PROP_STATIC_HOSTNAME,
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier        PROP_PRETTY_HOSTNAME,
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier        PROP_ICON_NAME,
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier        PROP_CHASSIS,
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier        PROP_DEPLOYMENT,
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier        PROP_LOCATION,
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier        PROP_KERNEL_NAME,
1f532d7ef35210f11e75cfcab0535e65a37901f3Ronny Chevalier        PROP_KERNEL_RELEASE,
1f532d7ef35210f11e75cfcab0535e65a37901f3Ronny Chevalier        PROP_KERNEL_VERSION,
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier        PROP_OS_PRETTY_NAME,
e6b5c5d03cb28d2149dc1c124c2a315911b91f4fRonny Chevalier        PROP_OS_CPE_NAME,
        _PROP_MAX
};

typedef struct Context {
        char *data[_PROP_MAX];
        Hashmap *polkit_registry;
} Context;

static void context_reset(Context *c) {
        int p;

        assert(c);

        for (p = 0; p < _PROP_MAX; p++)
                c->data[p] = mfree(c->data[p]);
}

static void context_free(Context *c) {
        assert(c);

        context_reset(c);
        bus_verify_polkit_async_registry_free(c->polkit_registry);
}

static int context_read_data(Context *c) {
        int r;
        struct utsname u;

        assert(c);

        context_reset(c);

        assert_se(uname(&u) >= 0);
        c->data[PROP_KERNEL_NAME] = strdup(u.sysname);
        c->data[PROP_KERNEL_RELEASE] = strdup(u.release);
        c->data[PROP_KERNEL_VERSION] = strdup(u.version);
        if (!c->data[PROP_KERNEL_NAME] || !c->data[PROP_KERNEL_RELEASE] ||
            !c->data[PROP_KERNEL_VERSION])
                return -ENOMEM;

        c->data[PROP_HOSTNAME] = gethostname_malloc();
        if (!c->data[PROP_HOSTNAME])
                return -ENOMEM;

        r = read_hostname_config("/etc/hostname", &c->data[PROP_STATIC_HOSTNAME]);
        if (r < 0 && r != -ENOENT)
                return r;

        r = parse_env_file("/etc/machine-info", NEWLINE,
                           "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
                           "ICON_NAME", &c->data[PROP_ICON_NAME],
                           "CHASSIS", &c->data[PROP_CHASSIS],
                           "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
                           "LOCATION", &c->data[PROP_LOCATION],
                           NULL);
        if (r < 0 && r != -ENOENT)
                return r;

        r = parse_env_file("/etc/os-release", NEWLINE,
                           "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
                           "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
                           NULL);
        if (r == -ENOENT)
                r = parse_env_file("/usr/lib/os-release", NEWLINE,
                                   "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
                                   "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
                                   NULL);

        if (r < 0 && r != -ENOENT)
                return r;

        return 0;
}

static bool valid_chassis(const char *chassis) {
        assert(chassis);

        return nulstr_contains(
                        "vm\0"
                        "container\0"
                        "desktop\0"
                        "laptop\0"
                        "server\0"
                        "tablet\0"
                        "handset\0"
                        "watch\0"
                        "embedded\0",
                        chassis);
}

static bool valid_deployment(const char *deployment) {
        assert(deployment);

        return in_charset(deployment, VALID_DEPLOYMENT_CHARS);
}

static const char* fallback_chassis(void) {
        int r;
        char *type;
        unsigned t;
        int v;

        v = detect_virtualization();

        if (VIRTUALIZATION_IS_VM(v))
                return "vm";
        if (VIRTUALIZATION_IS_CONTAINER(v))
                return "container";

        r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);
        if (r < 0)
                goto try_dmi;

        r = safe_atou(type, &t);
        free(type);
        if (r < 0)
                goto try_dmi;

        /* We only list the really obvious cases here as the ACPI data
         * is not really super reliable.
         *
         * See the ACPI 5.0 Spec Section 5.2.9.1 for details:
         *
         * http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
         */

        switch(t) {

        case 1:
        case 3:
        case 6:
                return "desktop";

        case 2:
                return "laptop";

        case 4:
        case 5:
        case 7:
                return "server";

        case 8:
                return "tablet";
        }

try_dmi:
        r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
        if (r < 0)
                return NULL;

        r = safe_atou(type, &t);
        free(type);
        if (r < 0)
                return NULL;

        /* We only list the really obvious cases here. The DMI data is
           unreliable enough, so let's not do any additional guesswork
           on top of that.

           See the SMBIOS Specification 4.0 section 7.4.1 for
           details about the values listed here:

           https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.0.0.pdf
         */

        switch (t) {

        case 0x3:
        case 0x4:
        case 0x6:
        case 0x7:
                return "desktop";

        case 0x8:
        case 0x9:
        case 0xA:
        case 0xE:
                return "laptop";

        case 0xB:
                return "handset";

        case 0x11:
        case 0x1C:
        case 0x1D:
                return "server";

        case 0x1E:
                return "tablet";
        }

        return NULL;
}

static char* context_fallback_icon_name(Context *c) {
        const char *chassis;

        assert(c);

        if (!isempty(c->data[PROP_CHASSIS]))
                return strappend("computer-", c->data[PROP_CHASSIS]);

        chassis = fallback_chassis();
        if (chassis)
                return strappend("computer-", chassis);

        return strdup("computer");
}


static bool hostname_is_useful(const char *hn) {
        return !isempty(hn) && !is_localhost(hn);
}

static int context_update_kernel_hostname(Context *c) {
        const char *static_hn;
        const char *hn;

        assert(c);

        static_hn = c->data[PROP_STATIC_HOSTNAME];

        /* /etc/hostname with something other than "localhost"
         * has the highest preference ... */
        if (hostname_is_useful(static_hn))
                hn = static_hn;

        /* ... the transient host name, (ie: DHCP) comes next ... */
        else if (!isempty(c->data[PROP_HOSTNAME]))
                hn = c->data[PROP_HOSTNAME];

        /* ... fallback to static "localhost.*" ignored above ... */
        else if (!isempty(static_hn))
                hn = static_hn;

        /* ... and the ultimate fallback */
        else
                hn = "localhost";

        if (sethostname_idempotent(hn) < 0)
                return -errno;

        return 0;
}

static int context_write_data_static_hostname(Context *c) {

        assert(c);

        if (isempty(c->data[PROP_STATIC_HOSTNAME])) {

                if (unlink("/etc/hostname") < 0)
                        return errno == ENOENT ? 0 : -errno;

                return 0;
        }
        return write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
}

static int context_write_data_machine_info(Context *c) {

        static const char * const name[_PROP_MAX] = {
                [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
                [PROP_ICON_NAME] = "ICON_NAME",
                [PROP_CHASSIS] = "CHASSIS",
                [PROP_DEPLOYMENT] = "DEPLOYMENT",
                [PROP_LOCATION] = "LOCATION",
        };

        _cleanup_strv_free_ char **l = NULL;
        int r, p;

        assert(c);

        r = load_env_file(NULL, "/etc/machine-info", NULL, &l);
        if (r < 0 && r != -ENOENT)
                return r;

        for (p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
                _cleanup_free_ char *t = NULL;
                char **u;

                assert(name[p]);

                if (isempty(c->data[p]))  {
                        strv_env_unset(l, name[p]);
                        continue;
                }

                t = strjoin(name[p], "=", c->data[p], NULL);
                if (!t)
                        return -ENOMEM;

                u = strv_env_set(l, t);
                if (!u)
                        return -ENOMEM;

                strv_free(l);
                l = u;
        }

        if (strv_isempty(l)) {
                if (unlink("/etc/machine-info") < 0)
                        return errno == ENOENT ? 0 : -errno;

                return 0;
        }

        return write_env_file_label("/etc/machine-info", l);
}

static int property_get_icon_name(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        _cleanup_free_ char *n = NULL;
        Context *c = userdata;
        const char *name;

        if (isempty(c->data[PROP_ICON_NAME]))
                name = n = context_fallback_icon_name(c);
        else
                name = c->data[PROP_ICON_NAME];

        if (!name)
                return -ENOMEM;

        return sd_bus_message_append(reply, "s", name);
}

static int property_get_chassis(
                sd_bus *bus,
                const char *path,
                const char *interface,
                const char *property,
                sd_bus_message *reply,
                void *userdata,
                sd_bus_error *error) {

        Context *c = userdata;
        const char *name;

        if (isempty(c->data[PROP_CHASSIS]))
                name = fallback_chassis();
        else
                name = c->data[PROP_CHASSIS];

        return sd_bus_message_append(reply, "s", name);
}

static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
        Context *c = userdata;
        const char *name;
        int interactive;
        char *h;
        int r;

        assert(m);
        assert(c);

        r = sd_bus_message_read(m, "sb", &name, &interactive);
        if (r < 0)
                return r;

        if (isempty(name))
                name = c->data[PROP_STATIC_HOSTNAME];

        if (isempty(name))
                name = "localhost";

        if (!hostname_is_valid(name, false))
                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);

        if (streq_ptr(name, c->data[PROP_HOSTNAME]))
                return sd_bus_reply_method_return(m, NULL);

        r = bus_verify_polkit_async(
                        m,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.hostname1.set-hostname",
                        NULL,
                        interactive,
                        UID_INVALID,
                        &c->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */

        h = strdup(name);
        if (!h)
                return -ENOMEM;

        free(c->data[PROP_HOSTNAME]);
        c->data[PROP_HOSTNAME] = h;

        r = context_update_kernel_hostname(c);
        if (r < 0) {
                log_error_errno(r, "Failed to set host name: %m");
                return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
        }

        log_info("Changed host name to '%s'", strna(c->data[PROP_HOSTNAME]));

        (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "Hostname", NULL);

        return sd_bus_reply_method_return(m, NULL);
}

static int method_set_static_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
        Context *c = userdata;
        const char *name;
        int interactive;
        int r;

        assert(m);
        assert(c);

        r = sd_bus_message_read(m, "sb", &name, &interactive);
        if (r < 0)
                return r;

        if (isempty(name))
                name = NULL;

        if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
                return sd_bus_reply_method_return(m, NULL);

        r = bus_verify_polkit_async(
                        m,
                        CAP_SYS_ADMIN,
                        "org.freedesktop.hostname1.set-static-hostname",
                        NULL,
                        interactive,
                        UID_INVALID,
                        &c->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */

        if (isempty(name)) {
                c->data[PROP_STATIC_HOSTNAME] = mfree(c->data[PROP_STATIC_HOSTNAME]);
        } else {
                char *h;

                if (!hostname_is_valid(name, false))
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);

                h = strdup(name);
                if (!h)
                        return -ENOMEM;

                free(c->data[PROP_STATIC_HOSTNAME]);
                c->data[PROP_STATIC_HOSTNAME] = h;
        }

        r = context_update_kernel_hostname(c);
        if (r < 0) {
                log_error_errno(r, "Failed to set host name: %m");
                return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
        }

        r = context_write_data_static_hostname(c);
        if (r < 0) {
                log_error_errno(r, "Failed to write static host name: %m");
                return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %s", strerror(-r));
        }

        log_info("Changed static host name to '%s'", strna(c->data[PROP_STATIC_HOSTNAME]));

        (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "StaticHostname", NULL);

        return sd_bus_reply_method_return(m, NULL);
}

static int set_machine_info(Context *c, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
        int interactive;
        const char *name;
        int r;

        assert(c);
        assert(m);

        r = sd_bus_message_read(m, "sb", &name, &interactive);
        if (r < 0)
                return r;

        if (isempty(name))
                name = NULL;

        if (streq_ptr(name, c->data[prop]))
                return sd_bus_reply_method_return(m, NULL);

        /* Since the pretty hostname should always be changed at the
         * same time as the static one, use the same policy action for
         * both... */

        r = bus_verify_polkit_async(
                        m,
                        CAP_SYS_ADMIN,
                        prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
                        NULL,
                        interactive,
                        UID_INVALID,
                        &c->polkit_registry,
                        error);
        if (r < 0)
                return r;
        if (r == 0)
                return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */

        if (isempty(name)) {
                c->data[prop] = mfree(c->data[prop]);
        } else {
                char *h;

                /* The icon name might ultimately be used as file
                 * name, so better be safe than sorry */

                if (prop == PROP_ICON_NAME && !filename_is_valid(name))
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
                if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty host name '%s'", name);
                if (prop == PROP_CHASSIS && !valid_chassis(name))
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
                if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
                if (prop == PROP_LOCATION && string_has_cc(name, NULL))
                        return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);

                h = strdup(name);
                if (!h)
                        return -ENOMEM;

                free(c->data[prop]);
                c->data[prop] = h;
        }

        r = context_write_data_machine_info(c);
        if (r < 0) {
                log_error_errno(r, "Failed to write machine info: %m");
                return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %s", strerror(-r));
        }

        log_info("Changed %s to '%s'",
                 prop == PROP_PRETTY_HOSTNAME ? "pretty host name" :
                 prop == PROP_DEPLOYMENT ? "deployment" :
                 prop == PROP_LOCATION ? "location" :
                 prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));

        (void) sd_bus_emit_properties_changed(
                        sd_bus_message_get_bus(m),
                        "/org/freedesktop/hostname1",
                        "org.freedesktop.hostname1",
                        prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
                        prop == PROP_DEPLOYMENT ? "Deployment" :
                        prop == PROP_LOCATION ? "Location" :
                        prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);

        return sd_bus_reply_method_return(m, NULL);
}

static int method_set_pretty_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
        return set_machine_info(userdata, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
}

static int method_set_icon_name(sd_bus_message *m, void *userdata, sd_bus_error *error) {
        return set_machine_info(userdata, m, PROP_ICON_NAME, method_set_icon_name, error);
}

static int method_set_chassis(sd_bus_message *m, void *userdata, sd_bus_error *error) {
        return set_machine_info(userdata, m, PROP_CHASSIS, method_set_chassis, error);
}

static int method_set_deployment(sd_bus_message *m, void *userdata, sd_bus_error *error) {
        return set_machine_info(userdata, m, PROP_DEPLOYMENT, method_set_deployment, error);
}

static int method_set_location(sd_bus_message *m, void *userdata, sd_bus_error *error) {
        return set_machine_info(userdata, m, PROP_LOCATION, method_set_location, error);
}

static const sd_bus_vtable hostname_vtable[] = {
        SD_BUS_VTABLE_START(0),
        SD_BUS_PROPERTY("Hostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("StaticHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_STATIC_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("PrettyHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("Deployment", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("Location", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
        SD_BUS_PROPERTY("KernelName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("KernelRelease", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_RELEASE, SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("KernelVersion", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_VERSION, SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_PROPERTY("OperatingSystemCPEName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
        SD_BUS_METHOD("SetHostname", "sb", NULL, method_set_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("SetStaticHostname", "sb", NULL, method_set_static_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("SetPrettyHostname", "sb", NULL, method_set_pretty_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("SetIconName", "sb", NULL, method_set_icon_name, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("SetChassis", "sb", NULL, method_set_chassis, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("SetDeployment", "sb", NULL, method_set_deployment, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_METHOD("SetLocation", "sb", NULL, method_set_location, SD_BUS_VTABLE_UNPRIVILEGED),
        SD_BUS_VTABLE_END,
};

static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
        int r;

        assert(c);
        assert(event);
        assert(_bus);

        r = sd_bus_default_system(&bus);
        if (r < 0)
                return log_error_errno(r, "Failed to get system bus connection: %m");

        r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", hostname_vtable, c);
        if (r < 0)
                return log_error_errno(r, "Failed to register object: %m");

        r = sd_bus_request_name(bus, "org.freedesktop.hostname1", 0);
        if (r < 0)
                return log_error_errno(r, "Failed to register name: %m");

        r = sd_bus_attach_event(bus, event, 0);
        if (r < 0)
                return log_error_errno(r, "Failed to attach bus to event loop: %m");

        *_bus = bus;
        bus = NULL;

        return 0;
}

int main(int argc, char *argv[]) {
        Context context = {};
        _cleanup_(sd_event_unrefp) sd_event *event = NULL;
        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
        int r;

        log_set_target(LOG_TARGET_AUTO);
        log_parse_environment();
        log_open();

        umask(0022);
        mac_selinux_init("/etc");

        if (argc != 1) {
                log_error("This program takes no arguments.");
                r = -EINVAL;
                goto finish;
        }

        r = sd_event_default(&event);
        if (r < 0) {
                log_error_errno(r, "Failed to allocate event loop: %m");
                goto finish;
        }

        sd_event_set_watchdog(event, true);

        r = connect_bus(&context, event, &bus);
        if (r < 0)
                goto finish;

        r = context_read_data(&context);
        if (r < 0) {
                log_error_errno(r, "Failed to read hostname and machine information: %m");
                goto finish;
        }

        r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
        if (r < 0) {
                log_error_errno(r, "Failed to run event loop: %m");
                goto finish;
        }

finish:
        context_free(&context);

        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}