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systemd/src/hostname/hostnamed.c
Valentin David 0dc39dffbd Use paths specified from environment variables for /etc configuration files 
Some configuration files that need updates are directly under in /etc. To
update them atomically, we need write access to /etc. For Ubuntu Core this is
an issue as /etc is not writable. Only a selection of subdirectories can be
writable. The general solution is symlinks or bind mounts to writable places.
But for atomic writes in /etc, that does not work. So Ubuntu has had a patch
for that that did not age well.

Instead we would like to introduce some environment variables for alternate
paths.

 * SYSTEMD_ETC_HOSTNAME: /etc/hostname
 * SYSTEMD_ETC_MACHINE_INFO: /etc/machine-info
 * SYSTEMD_ETC_LOCALTIME: /etc/localtime
 * SYSTEMD_ETC_LOCALE_CONF: /etc/locale.conf
 * SYSTEMD_ETC_VCONSOLE_CONF: /etc/vconsole.conf
 * SYSTEMD_ETC_ADJTIME: /etc/adjtime

While it is for now expected that there is a symlink from the standard, we
still try to read them from that alternate path. This is important for
`/etc/localtime`, which is a symlink, so we cannot have an indirect symlink or
bind mount for it.

Since machine-id is typically written only once and not updated. This commit
does not cover it. An initrd can properly create it and bind mount it.
2025-06-23 15:32:11 +02:00

2049 lines
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <sys/stat.h>
#include <sys/utsname.h>
#include <unistd.h>
#include "sd-bus.h"
#include "sd-device.h"
#include "sd-event.h"
#include "sd-json.h"
#include "alloc-util.h"
#include "bitfield.h"
#include "bus-common-errors.h"
#include "bus-get-properties.h"
#include "bus-log-control-api.h"
#include "bus-object.h"
#include "bus-polkit.h"
#include "bus-util.h"
#include "constants.h"
#include "daemon-util.h"
#include "device-private.h"
#include "env-file.h"
#include "env-util.h"
#include "extract-word.h"
#include "fileio.h"
#include "hashmap.h"
#include "hostname-setup.h"
#include "hostname-util.h"
#include "id128-util.h"
#include "json-util.h"
#include "label-util.h"
#include "log.h"
#include "main-func.h"
#include "nulstr-util.h"
#include "os-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "service-util.h"
#include "socket-util.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
#include "time-util.h"
#include "utf8.h"
#include "varlink-io.systemd.Hostname.h"
#include "varlink-io.systemd.service.h"
#include "varlink-util.h"
#include "virt.h"
#define VALID_DEPLOYMENT_CHARS (DIGITS LETTERS "-.:")
/* Properties we cache are indexed by an enum, to make invalidation easy and systematic (as we can iterate
* through them all, and they are uniformly strings). */
typedef enum {
/* Read from /etc/hostname */
PROP_STATIC_HOSTNAME,
PROP_STATIC_HOSTNAME_SUBSTITUTED_WILDCARDS,
/* Read from /etc/machine-info */
PROP_PRETTY_HOSTNAME,
PROP_ICON_NAME,
PROP_CHASSIS,
PROP_DEPLOYMENT,
PROP_LOCATION,
PROP_HARDWARE_VENDOR,
PROP_HARDWARE_MODEL,
PROP_HARDWARE_SKU,
PROP_HARDWARE_VERSION,
/* Read from /etc/os-release (or /usr/lib/os-release) */
PROP_OS_PRETTY_NAME,
PROP_OS_CPE_NAME,
PROP_OS_HOME_URL,
PROP_OS_SUPPORT_END,
PROP_OS_IMAGE_ID,
PROP_OS_IMAGE_VERSION,
_PROP_MAX,
_PROP_INVALID = -EINVAL,
} HostProperty;
typedef struct Context {
char *data[_PROP_MAX];
HostnameSource hostname_source;
struct stat etc_hostname_stat;
struct stat etc_os_release_stat;
struct stat etc_machine_info_stat;
sd_event *event;
sd_bus *bus;
sd_varlink_server *varlink_server;
Hashmap *polkit_registry;
sd_device *device_dmi;
sd_device *device_acpi;
sd_device *device_tree;
} Context;
static void context_reset(Context *c, uint64_t mask) {
assert(c);
for (HostProperty p = 0; p < _PROP_MAX; p++) {
if (!BIT_SET(mask, p))
continue;
c->data[p] = mfree(c->data[p]);
}
}
static void context_destroy(Context *c) {
assert(c);
context_reset(c, UINT64_MAX);
hashmap_free(c->polkit_registry);
sd_event_unref(c->event);
sd_bus_flush_close_unref(c->bus);
sd_varlink_server_unref(c->varlink_server);
sd_device_unref(c->device_dmi);
sd_device_unref(c->device_acpi);
sd_device_unref(c->device_tree);
}
static void context_read_etc_hostname(Context *c) {
struct stat current_stat = {};
int r;
assert(c);
if (stat(etc_hostname(), &current_stat) >= 0 &&
stat_inode_unmodified(&c->etc_hostname_stat, &current_stat))
return;
context_reset(c,
(UINT64_C(1) << PROP_STATIC_HOSTNAME) |
(UINT64_C(1) << PROP_STATIC_HOSTNAME_SUBSTITUTED_WILDCARDS));
r = read_etc_hostname(/* path= */ NULL, /* substitute_wildcards= */ false, &c->data[PROP_STATIC_HOSTNAME]);
if (r < 0) {
if (r != -ENOENT)
log_warning_errno(r, "Failed to read /etc/hostname, ignoring: %m");
} else {
_cleanup_free_ char *substituted = strdup(c->data[PROP_STATIC_HOSTNAME]);
if (!substituted)
return (void) log_oom();
r = hostname_substitute_wildcards(substituted);
if (r < 0)
log_warning_errno(r, "Failed to substitute wildcards in /etc/hostname, ignoring: %m");
else
c->data[PROP_STATIC_HOSTNAME_SUBSTITUTED_WILDCARDS] = TAKE_PTR(substituted);
}
c->etc_hostname_stat = current_stat;
}
static void context_read_machine_info(Context *c) {
struct stat current_stat = {};
int r;
assert(c);
if (stat(etc_machine_info(), &current_stat) >= 0 &&
stat_inode_unmodified(&c->etc_machine_info_stat, &current_stat))
return;
context_reset(c,
(UINT64_C(1) << PROP_PRETTY_HOSTNAME) |
(UINT64_C(1) << PROP_ICON_NAME) |
(UINT64_C(1) << PROP_CHASSIS) |
(UINT64_C(1) << PROP_DEPLOYMENT) |
(UINT64_C(1) << PROP_LOCATION) |
(UINT64_C(1) << PROP_HARDWARE_VENDOR) |
(UINT64_C(1) << PROP_HARDWARE_MODEL) |
(UINT64_C(1) << PROP_HARDWARE_SKU) |
(UINT64_C(1) << PROP_HARDWARE_VERSION));
r = parse_env_file(NULL, etc_machine_info(),
"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],
"HARDWARE_VENDOR", &c->data[PROP_HARDWARE_VENDOR],
"HARDWARE_MODEL", &c->data[PROP_HARDWARE_MODEL],
"HARDWARE_SKU", &c->data[PROP_HARDWARE_SKU],
"HARDWARE_VERSION", &c->data[PROP_HARDWARE_VERSION]);
if (r < 0 && r != -ENOENT)
log_warning_errno(r, "Failed to read /etc/machine-info, ignoring: %m");
c->etc_machine_info_stat = current_stat;
}
static void context_read_os_release(Context *c) {
_cleanup_free_ char *os_name = NULL, *os_pretty_name = NULL;
struct stat current_stat = {};
int r;
assert(c);
if ((stat("/etc/os-release", &current_stat) >= 0 ||
stat("/usr/lib/os-release", &current_stat) >= 0) &&
stat_inode_unmodified(&c->etc_os_release_stat, &current_stat))
return;
context_reset(c,
(UINT64_C(1) << PROP_OS_PRETTY_NAME) |
(UINT64_C(1) << PROP_OS_CPE_NAME) |
(UINT64_C(1) << PROP_OS_HOME_URL) |
(UINT64_C(1) << PROP_OS_SUPPORT_END) |
(UINT64_C(1) << PROP_OS_IMAGE_ID) |
(UINT64_C(1) << PROP_OS_IMAGE_VERSION));
r = parse_os_release(NULL,
"PRETTY_NAME", &os_pretty_name,
"NAME", &os_name,
"CPE_NAME", &c->data[PROP_OS_CPE_NAME],
"HOME_URL", &c->data[PROP_OS_HOME_URL],
"SUPPORT_END", &c->data[PROP_OS_SUPPORT_END],
"IMAGE_ID", &c->data[PROP_OS_IMAGE_ID],
"IMAGE_VERSION", &c->data[PROP_OS_IMAGE_VERSION]);
if (r < 0 && r != -ENOENT)
log_warning_errno(r, "Failed to read os-release file, ignoring: %m");
if (free_and_strdup(&c->data[PROP_OS_PRETTY_NAME], os_release_pretty_name(os_pretty_name, os_name)) < 0)
log_oom();
c->etc_os_release_stat = current_stat;
}
static bool use_dmi_data(void) {
int r;
r = getenv_bool("SYSTEMD_HOSTNAME_FORCE_DMI");
if (r >= 0) {
log_debug("Honouring $SYSTEMD_HOSTNAME_FORCE_DMI override: %s", yes_no(r));
return r;
}
if (r != -ENXIO)
log_debug_errno(r, "Failed to parse $SYSTEMD_HOSTNAME_FORCE_DMI, ignoring: %m");
if (detect_container() > 0) {
log_debug("Running in a container, not using DMI hardware data.");
return false;
}
return true;
}
static int context_acquire_dmi_device(Context *c) {
int r;
assert(c);
assert(!c->device_dmi);
if (!use_dmi_data())
return 0;
r = sd_device_new_from_syspath(&c->device_dmi, "/sys/class/dmi/id/");
if (ERRNO_IS_NEG_DEVICE_ABSENT(r)) {
log_debug_errno(r, "Failed to open /sys/class/dmi/id/ device, ignoring: %m");
return 0;
}
if (r < 0)
return log_error_errno(r, "Failed to open /sys/class/dmi/id/ device: %m");
return 1;
}
static int context_acquire_acpi_device(Context *c) {
int r;
assert(c);
assert(!c->device_acpi);
r = sd_device_new_from_syspath(&c->device_acpi, "/sys/firmware/acpi/");
if (ERRNO_IS_NEG_DEVICE_ABSENT(r)) {
log_debug_errno(r, "Failed to open /sys/firmware/acpi/ device, ignoring: %m");
return 0;
}
if (r < 0)
return log_error_errno(r, "Failed to open /sys/firmware/acpi/ device: %m");
return 1;
}
static int context_acquire_device_tree(Context *c) {
int r;
assert(c);
assert(!c->device_tree);
r = sd_device_new_from_path(&c->device_tree, "/proc/device-tree/");
if (ERRNO_IS_NEG_DEVICE_ABSENT(r)) {
log_debug_errno(r, "Failed to open /proc/device-tree/ device, ignoring: %m");
return 0;
}
if (r < 0)
return log_error_errno(r, "Failed to open /proc/device-tree/ device: %m");
return 1;
}
static bool string_is_safe_for_dbus(const char *s) {
assert(s);
/* Do some superficial validation: do not allow CCs and make sure D-Bus won't kick us off the bus
* because we send invalid UTF-8 data */
if (string_has_cc(s, /* ok= */ NULL))
return false;
return utf8_is_valid(s);
}
static int get_dmi_property(Context *c, const char *key, char **ret) {
const char *s;
int r;
assert(c);
assert(key);
assert(ret);
if (!c->device_dmi)
return -ENODEV;
r = sd_device_get_property_value(c->device_dmi, key, &s);
if (r < 0)
return r;
if (!string_is_safe_for_dbus(s))
return -ENXIO;
return strdup_to(ret, s);
}
static int get_dmi_properties(Context *c, const char * const * keys, char **ret) {
int r = -ENOENT;
assert(c);
assert(ret);
STRV_FOREACH(k, keys) {
r = get_dmi_property(c, *k, ret);
if (r >= 0 || !ERRNO_IS_NEG_DEVICE_ABSENT(r))
return r;
}
return r;
}
static int get_chassis_asset_tag(Context *c, char **ret) {
return get_dmi_property(c, "ID_CHASSIS_ASSET_TAG", ret);
}
static int get_hardware_vendor(Context *c, char **ret) {
return get_dmi_properties(c, STRV_MAKE_CONST("ID_VENDOR_FROM_DATABASE", "ID_VENDOR"), ret);
}
static int get_hardware_model(Context *c, char **ret) {
return get_dmi_properties(c, STRV_MAKE_CONST("ID_MODEL_FROM_DATABASE", "ID_MODEL"), ret);
}
static int get_hardware_sku(Context *c, char **ret) {
_cleanup_free_ char *model = NULL, *sku = NULL;
int r;
r = get_dmi_property(c, "ID_SKU", &sku);
if (r < 0)
return r;
/* Suppress reporting the SKU field, if it's the same string as the
* model field, which it appears to be on various systems */
r = get_hardware_model(c, &model);
if (r < 0) {
if (r != -ENOENT)
return r;
} else if (streq_ptr(sku, model))
return -ENOENT;
*ret = TAKE_PTR(sku);
return 0;
}
static int get_hardware_version(Context *c, char **ret) {
_cleanup_free_ char *version = NULL;
int r;
r = get_dmi_property(c, "ID_HARDWARE_VERSION", &version);
if (r < 0)
return r;
/* Suppress reporting the version field, if it's the same string as the
* model or sku field, which it appears to be on various systems */
int (*getter)(Context *c, char **ret);
FOREACH_ARGUMENT(getter, get_hardware_model, get_hardware_sku) {
_cleanup_free_ char *value = NULL;
r = getter(c, &value);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
if (streq_ptr(version, value))
return -ENOENT;
}
*ret = TAKE_PTR(version);
return 0;
}
static int get_sysattr(sd_device *device, const char *key, char **ret) {
const char *s;
int r;
assert(key);
assert(ret);
if (!device)
return -ENODEV;
r = sd_device_get_sysattr_value(device, key, &s);
if (r < 0)
return r;
if (!string_is_safe_for_dbus(s))
return -ENXIO;
return strdup_to(ret, empty_to_null(s));
}
static int get_dmi_sysattr(Context *c, const char *key, char **ret) {
return get_sysattr(ASSERT_PTR(c)->device_dmi, key, ret);
}
static int get_device_tree_sysattr(Context *c, const char *key, char **ret) {
return get_sysattr(ASSERT_PTR(c)->device_tree, key, ret);
}
static int get_hardware_serial(Context *c, char **ret) {
int r;
assert(c);
assert(ret);
FOREACH_STRING(attr, "product_serial", "board_serial") {
r = get_dmi_sysattr(c, attr, ret);
if (r >= 0 || !ERRNO_IS_NEG_DEVICE_ABSENT(r))
return r;
}
return get_device_tree_sysattr(c, "serial-number", ret);
}
static int get_firmware_version(Context *c, char **ret) {
return get_dmi_sysattr(c, "bios_version", ret);
}
static int get_firmware_vendor(Context *c, char **ret) {
return get_dmi_sysattr(c, "bios_vendor", ret);
}
static int get_firmware_date(Context *c, usec_t *ret) {
_cleanup_free_ char *bios_date = NULL, *month = NULL, *day = NULL, *year = NULL;
int r;
assert(c);
assert(ret);
r = get_dmi_sysattr(c, "bios_date", &bios_date);
if (ERRNO_IS_NEG_DEVICE_ABSENT(r)) {
*ret = USEC_INFINITY;
return 0;
}
if (r < 0)
return r;
const char *p = bios_date;
r = extract_many_words(&p, "/", EXTRACT_DONT_COALESCE_SEPARATORS, &month, &day, &year);
if (r < 0)
return r;
if (r != 3) /* less than three args read? */
return -EINVAL;
if (!isempty(p)) /* more left in the string? */
return -EINVAL;
unsigned m, d, y;
r = safe_atou_full(month, 10 | SAFE_ATO_REFUSE_PLUS_MINUS | SAFE_ATO_REFUSE_LEADING_WHITESPACE, &m);
if (r < 0)
return r;
if (m < 1 || m > 12)
return -EINVAL;
m -= 1;
r = safe_atou_full(day, 10 | SAFE_ATO_REFUSE_PLUS_MINUS | SAFE_ATO_REFUSE_LEADING_WHITESPACE, &d);
if (r < 0)
return r;
if (d < 1 || d > 31)
return -EINVAL;
r = safe_atou_full(year, 10 | SAFE_ATO_REFUSE_PLUS_MINUS | SAFE_ATO_REFUSE_LEADING_WHITESPACE, &y);
if (r < 0)
return r;
if (y < 1970 || y > (unsigned) INT_MAX)
return -EINVAL;
y -= 1900;
struct tm tm = {
.tm_mday = d,
.tm_mon = m,
.tm_year = y,
};
usec_t v;
r = mktime_or_timegm_usec(&tm, /* utc= */ true, &v);
if (r < 0)
return r;
if (tm.tm_mday != (int) d || tm.tm_mon != (int) m || tm.tm_year != (int) y)
return -EINVAL; /* date was not normalized? (e.g. "30th of feb") */
*ret = v;
return 0;
}
static const char* valid_chassis(const char *chassis) {
assert(chassis);
return nulstr_get(
"vm\0"
"container\0"
"desktop\0"
"laptop\0"
"convertible\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_by_virtualization(void) {
Virtualization v = detect_virtualization();
if (v < 0) {
log_debug_errno(v, "Failed to detect virtualization, ignoring: %m");
return NULL;
}
if (VIRTUALIZATION_IS_VM(v))
return "vm";
if (VIRTUALIZATION_IS_CONTAINER(v))
return "container";
return NULL;
}
static const char* fallback_chassis_by_dmi(Context *c) {
unsigned t;
int r;
assert(c);
if (!c->device_dmi)
return NULL;
r = device_get_sysattr_unsigned(c->device_dmi, "chassis_type", &t);
if (r < 0) {
log_debug_errno(r, "Failed to read/parse DMI chassis type, ignoring: %m");
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 3.5.0 section 7.4.1 for details about the values listed here:
*
* https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.5.0.pdf
*/
switch (t) {
case 0x03: /* Desktop */
case 0x04: /* Low Profile Desktop */
case 0x06: /* Mini Tower */
case 0x07: /* Tower */
case 0x0D: /* All in one (i.e. PC built into monitor) */
case 0x23: /* Mini PC */
case 0x24: /* Stick PC */
return "desktop";
case 0x8: /* Portable */
case 0x9: /* Laptop */
case 0xA: /* Notebook */
case 0xE: /* Sub Notebook */
return "laptop";
case 0xB: /* Hand Held */
return "handset";
case 0x11: /* Main Server Chassis */
case 0x1C: /* Blade */
case 0x1D: /* Blade Enclosure */
return "server";
case 0x1E: /* Tablet */
return "tablet";
case 0x1F: /* Convertible */
case 0x20: /* Detachable */
return "convertible";
case 0x21: /* IoT Gateway */
case 0x22: /* Embedded PC */
return "embedded";
default:
log_debug("Unhandled DMI chassis type 0x%02x, ignoring.", t);
return NULL;
}
}
static const char* fallback_chassis_by_acpi(Context *c) {
unsigned t;
int r;
assert(c);
if (!c->device_acpi)
return NULL;
r = device_get_sysattr_unsigned(c->device_acpi, "pm_profile", &t);
if (r < 0) {
log_debug_errno(r, "Failed read/parse ACPI PM profile, ignoring: %m");
return NULL;
}
/* 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: /* Desktop */
case 3: /* Workstation */
case 6: /* Appliance PC */
return "desktop";
case 2: /* Mobile */
return "laptop";
case 4: /* Enterprise Server */
case 5: /* SOHO Server */
case 7: /* Performance Server */
return "server";
case 8: /* Tablet */
return "tablet";
default:
log_debug("Unhandled ACPI PM profile 0x%02x, ignoring.", t);
return NULL;
}
}
static const char* fallback_chassis_by_device_tree(Context *c) {
const char *type, *chassis;
int r;
assert(c);
if (!c->device_tree)
return NULL;
r = sd_device_get_sysattr_value(c->device_tree, "chassis-type", &type);
if (r < 0) {
log_debug_errno(r, "Failed to read device-tree chassis type, ignoring: %m");
return NULL;
}
/* Note that the DeviceTree specification uses the very same vocabulary
* of chassis types as we do, hence we do not need to translate these types:
*
* https://github.com/devicetree-org/devicetree-specification/blob/master/source/chapter3-devicenodes.rst */
chassis = valid_chassis(type);
if (!chassis)
log_debug("Invalid device-tree chassis type \"%s\", ignoring.", type);
return chassis;
}
static const char* fallback_chassis(Context *c) {
assert(c);
return
fallback_chassis_by_virtualization() ?:
fallback_chassis_by_dmi(c) ?:
fallback_chassis_by_acpi(c) ?:
fallback_chassis_by_device_tree(c);
}
static char* context_get_chassis(Context *c) {
const char *fallback;
char *dmi;
assert(c);
if (!isempty(c->data[PROP_CHASSIS]))
return strdup(c->data[PROP_CHASSIS]);
if (get_dmi_property(c, "ID_CHASSIS", &dmi) >= 0)
return dmi;
fallback = fallback_chassis(c);
if (fallback)
return strdup(fallback);
return NULL;
}
static char* context_fallback_icon_name(Context *c) {
_cleanup_free_ char *chassis = NULL;
assert(c);
chassis = context_get_chassis(c);
if (chassis)
return strjoin("computer-", chassis);
return strdup("computer");
}
static int context_update_kernel_hostname(
Context *c,
const char *transient_hostname) {
_cleanup_free_ char *_hn_free = NULL;
const char *hn;
HostnameSource hns;
int r;
assert(c);
/* /etc/hostname has the highest preference ... */
if (c->data[PROP_STATIC_HOSTNAME_SUBSTITUTED_WILDCARDS]) {
hn = c->data[PROP_STATIC_HOSTNAME_SUBSTITUTED_WILDCARDS];
hns = HOSTNAME_STATIC;
/* ... the transient hostname, (ie: DHCP) comes next ... */
} else if (transient_hostname) {
hn = transient_hostname;
hns = HOSTNAME_TRANSIENT;
/* ... and the ultimate fallback */
} else {
hn = _hn_free = get_default_hostname();
if (!hn)
return log_oom();
hns = HOSTNAME_DEFAULT;
}
r = sethostname_idempotent(hn);
if (r < 0)
return log_error_errno(r, "Failed to set hostname: %m");
if (c->hostname_source != hns) {
c->hostname_source = hns;
r = 1;
}
if (r == 0)
log_debug("Hostname was already set to <%s>.", hn);
else {
log_info("Hostname set to <%s> (%s)", hn, hostname_source_to_string(hns));
hostname_update_source_hint(hn, hns);
}
return r; /* 0 if no change, 1 if something was done */
}
static void unset_statp(struct stat **p) {
if (!*p)
return;
**p = (struct stat) {};
}
static int context_write_data_static_hostname(Context *c) {
_cleanup_(unset_statp) struct stat *s = NULL;
int r;
assert(c);
/* Make sure that if we fail here, we invalidate the cached information, since it was updated
* already, even if we can't make it hit the disk. */
s = &c->etc_hostname_stat;
if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
if (unlink(etc_hostname()) < 0 && errno != ENOENT)
return -errno;
TAKE_PTR(s);
return 0;
}
r = write_string_file(etc_hostname(), c->data[PROP_STATIC_HOSTNAME], WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC|WRITE_STRING_FILE_LABEL);
if (r < 0)
return r;
TAKE_PTR(s);
return 0;
}
static int context_write_data_machine_info(Context *c) {
_cleanup_(unset_statp) struct stat *s = NULL;
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;
assert(c);
/* Make sure that if we fail here, we invalidate the cached information, since it was updated
* already, even if we can't make it hit the disk. */
s = &c->etc_machine_info_stat;
r = load_env_file(NULL, etc_machine_info(), &l);
if (r < 0 && r != -ENOENT)
return r;
for (HostProperty p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
assert(name[p]);
r = strv_env_assign(&l, name[p], empty_to_null(c->data[p]));
if (r < 0)
return r;
}
if (strv_isempty(l)) {
if (unlink(etc_machine_info()) < 0 && errno != ENOENT)
return -errno;
TAKE_PTR(s);
return 0;
}
r = write_env_file(
AT_FDCWD,
etc_machine_info(),
/* headers= */NULL,
l,
WRITE_ENV_FILE_LABEL);
if (r < 0)
return r;
TAKE_PTR(s);
return 0;
}
static int property_get_hardware_property(
sd_bus_message *reply,
Context *c,
HostProperty prop,
int (*getter)(Context *c, char **ret)) {
_cleanup_free_ char *from_dmi = NULL;
assert(reply);
assert(c);
assert(IN_SET(prop, PROP_HARDWARE_VENDOR, PROP_HARDWARE_MODEL,
PROP_HARDWARE_SKU, PROP_HARDWARE_VERSION));
assert(getter);
context_read_machine_info(c);
if (isempty(c->data[prop]))
(void) getter(c, &from_dmi);
return sd_bus_message_append(reply, "s", from_dmi ?: c->data[prop]);
}
static int property_get_hardware_vendor(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
return property_get_hardware_property(reply, userdata, PROP_HARDWARE_VENDOR, get_hardware_vendor);
}
static int property_get_hardware_model(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
return property_get_hardware_property(reply, userdata, PROP_HARDWARE_MODEL, get_hardware_model);
}
static int property_get_hardware_sku(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
return property_get_hardware_property(reply, userdata, PROP_HARDWARE_SKU, get_hardware_sku);
}
static int property_get_hardware_version(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
return property_get_hardware_property(reply, userdata, PROP_HARDWARE_VERSION, get_hardware_version);
}
static int property_get_firmware_version(
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 *firmware_version = NULL;
Context *c = ASSERT_PTR(userdata);
(void) get_firmware_version(c, &firmware_version);
return sd_bus_message_append(reply, "s", firmware_version);
}
static int property_get_firmware_vendor(
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 *firmware_vendor = NULL;
Context *c = ASSERT_PTR(userdata);
(void) get_firmware_vendor(c, &firmware_vendor);
return sd_bus_message_append(reply, "s", firmware_vendor);
}
static int property_get_firmware_date(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
usec_t firmware_date = USEC_INFINITY;
Context *c = ASSERT_PTR(userdata);
(void) get_firmware_date(c, &firmware_date);
return sd_bus_message_append(reply, "t", firmware_date);
}
static int property_get_chassis_asset_tag(
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 *chassis_asset_tag = NULL;
Context *c = ASSERT_PTR(userdata);
(void) get_chassis_asset_tag(c, &chassis_asset_tag);
return sd_bus_message_append(reply, "s", chassis_asset_tag);
}
static int property_get_hostname(
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 *hn = NULL;
int r;
r = gethostname_strict(&hn);
if (r < 0) {
if (r != -ENXIO)
return r;
hn = get_default_hostname();
if (!hn)
return -ENOMEM;
}
return sd_bus_message_append(reply, "s", hn);
}
static int property_get_static_hostname(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
Context *c = ASSERT_PTR(userdata);
context_read_etc_hostname(c);
return sd_bus_message_append(reply, "s", c->data[PROP_STATIC_HOSTNAME_SUBSTITUTED_WILDCARDS]);
}
static int property_get_default_hostname(
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 *hn = NULL;
hn = get_default_hostname();
if (!hn)
return log_oom();
return sd_bus_message_append(reply, "s", hn);
}
static void context_determine_hostname_source(Context *c) {
_cleanup_free_ char *hostname = NULL;
int r;
assert(c);
if (c->hostname_source >= 0)
return;
(void) gethostname_full(GET_HOSTNAME_ALLOW_LOCALHOST, &hostname);
if (streq_ptr(hostname, c->data[PROP_STATIC_HOSTNAME_SUBSTITUTED_WILDCARDS]))
c->hostname_source = HOSTNAME_STATIC;
else {
_cleanup_free_ char *fallback = NULL;
/* If the hostname was not set by us, try to figure out where it came from. If we set it to
* the default hostname, the file will tell us. We compare the string because it is possible
* that the hostname was set by an older version that had a different fallback, in the initrd
* or before we reexecuted. */
r = read_one_line_file("/run/systemd/default-hostname", &fallback);
if (r < 0 && r != -ENOENT)
log_warning_errno(r, "Failed to read /run/systemd/default-hostname, ignoring: %m");
if (streq_ptr(fallback, hostname))
c->hostname_source = HOSTNAME_DEFAULT;
else
c->hostname_source = HOSTNAME_TRANSIENT;
}
}
static int property_get_hostname_source(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
Context *c = ASSERT_PTR(userdata);
context_read_etc_hostname(c);
context_determine_hostname_source(c);
return sd_bus_message_append(reply, "s", hostname_source_to_string(c->hostname_source));
}
static int property_get_machine_info_field(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
sd_bus_slot *slot;
Context *c;
/* Acquire the context object without this property's userdata offset added. Explanation: we want
* access to two pointers here: a) the main context object we cache all properties in, and b) the
* pointer to the property field inside the context object that we are supposed to update and
* use. The latter (b) we get in the 'userdata' function parameter, and sd-bus calculates that for us
* from the 'userdata' pointer we supplied when the vtable was registered, with the offset we
* specified in the vtable added on top. To get the former (a) we need the 'userdata' pointer from
* the vtable registration directly, without the offset added. Hence we ask sd-bus what the slot
* object is (which encapsulates the vtable registration), and then query the 'userdata' field
* directly off it. */
assert_se(slot = sd_bus_get_current_slot(bus));
assert_se(c = sd_bus_slot_get_userdata(slot));
context_read_machine_info(c);
return sd_bus_message_append(reply, "s", *(char**) userdata);
}
static int property_get_os_release_field(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
sd_bus_slot *slot;
Context *c;
/* As above, acquire the current context without this property's userdata offset added. */
assert_se(slot = sd_bus_get_current_slot(bus));
assert_se(c = sd_bus_slot_get_userdata(slot));
context_read_os_release(c);
return sd_bus_message_append(reply, "s", *(char**) userdata);
}
static int property_get_os_support_end(
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;
usec_t eol = USEC_INFINITY;
context_read_os_release(c);
if (c->data[PROP_OS_SUPPORT_END])
(void) os_release_support_ended(c->data[PROP_OS_SUPPORT_END], /* quiet= */ false, &eol);
return sd_bus_message_append(reply, "t", eol);
}
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;
context_read_machine_info(c);
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) {
_cleanup_free_ char *chassis = NULL;
Context *c = userdata;
context_read_machine_info(c);
chassis = context_get_chassis(c);
return sd_bus_message_append(reply, "s", chassis);
}
static int property_get_uname_field(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
struct utsname u;
assert_se(uname(&u) >= 0);
return sd_bus_message_append(reply, "s", (char*) &u + PTR_TO_SIZE(userdata));
}
static int property_get_machine_id(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
sd_id128_t id;
int r;
r = sd_id128_get_machine(&id);
if (r < 0)
return r;
return bus_property_get_id128(bus, path, interface, property, reply, &id, error);
}
static int property_get_boot_id(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
sd_id128_t id;
int r;
r = sd_id128_get_boot(&id);
if (r < 0)
return r;
return bus_property_get_id128(bus, path, interface, property, reply, &id, error);
}
static int property_get_vsock_cid(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
unsigned local_cid = VMADDR_CID_ANY;
(void) vsock_get_local_cid(&local_cid);
return sd_bus_message_append(reply, "u", (uint32_t) local_cid);
}
static int validate_and_substitute_hostname(const char *name, char **ret_substituted, sd_bus_error *error) {
int r;
assert(ret_substituted);
if (!name) {
*ret_substituted = NULL;
return 0;
}
_cleanup_free_ char *substituted = strdup(name);
if (!substituted)
return log_oom();
r = hostname_substitute_wildcards(substituted);
if (r < 0)
return log_error_errno(r, "Failed to substitute wildcards in hostname: %m");
if (!hostname_is_valid(substituted, 0))
return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
*ret_substituted = TAKE_PTR(substituted);
return 1;
}
static int method_set_hostname(sd_bus_message *m, void *userdata, sd_bus_error *error) {
Context *c = ASSERT_PTR(userdata);
const char *name;
int interactive, r;
assert(m);
r = sd_bus_message_read(m, "sb", &name, &interactive);
if (r < 0)
return r;
name = empty_to_null(name);
/* We always go through with the procedure below without comparing to the current hostname, because
* we might want to adjust hostname source information even if the actual hostname is unchanged. */
_cleanup_free_ char *substituted = NULL;
r = validate_and_substitute_hostname(name, &substituted, error);
if (r < 0)
return r;
name = substituted;
r = bus_verify_polkit_async_full(
m,
"org.freedesktop.hostname1.set-hostname",
/* details= */ NULL,
/* good_user= */ UID_INVALID,
interactive ? POLKIT_ALLOW_INTERACTIVE : 0,
&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 */
context_read_etc_hostname(c);
r = context_update_kernel_hostname(c, name);
if (r < 0)
return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
else if (r > 0)
(void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
"/org/freedesktop/hostname1", "org.freedesktop.hostname1",
"Hostname", "HostnameSource", 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 = ASSERT_PTR(userdata);
const char *name;
int interactive, r;
assert(m);
r = sd_bus_message_read(m, "sb", &name, &interactive);
if (r < 0)
return r;
name = empty_to_null(name);
context_read_etc_hostname(c);
if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
return sd_bus_reply_method_return(m, NULL);
_cleanup_free_ char *substituted = NULL;
r = validate_and_substitute_hostname(name, &substituted, error);
if (r < 0)
return r;
r = bus_verify_polkit_async_full(
m,
"org.freedesktop.hostname1.set-static-hostname",
/* details= */ NULL,
/* good_user= */ UID_INVALID,
interactive ? POLKIT_ALLOW_INTERACTIVE : 0,
&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 */
r = free_and_strdup_warn(&c->data[PROP_STATIC_HOSTNAME], name);
if (r < 0)
return r;
free_and_replace(c->data[PROP_STATIC_HOSTNAME_SUBSTITUTED_WILDCARDS], substituted);
r = context_write_data_static_hostname(c);
if (r < 0) {
log_error_errno(r, "Failed to write static hostname: %m");
if (ERRNO_IS_PRIVILEGE(r))
return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/hostname.");
if (r == -EROFS)
return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/hostname is in a read-only filesystem.");
return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %m");
}
r = context_update_kernel_hostname(c, /* transient_hostname= */ NULL);
if (r < 0) {
log_error_errno(r, "Failed to set hostname: %m");
return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %m");
}
(void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m),
"/org/freedesktop/hostname1", "org.freedesktop.hostname1",
"StaticHostname", "Hostname", "HostnameSource", 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;
name = empty_to_null(name);
context_read_machine_info(c);
if (streq_ptr(name, c->data[prop]))
return sd_bus_reply_method_return(m, NULL);
if (!isempty(name)) {
/* 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 hostname '%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);
}
/* 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_full(
m,
prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
/* details= */ NULL,
/* good_user= */ UID_INVALID,
interactive ? POLKIT_ALLOW_INTERACTIVE : 0,
&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 */
r = free_and_strdup_warn(&c->data[prop], name);
if (r < 0)
return r;
r = context_write_data_machine_info(c);
if (r < 0) {
log_error_errno(r, "Failed to write machine info: %m");
if (ERRNO_IS_PRIVILEGE(r))
return sd_bus_error_set(error, BUS_ERROR_FILE_IS_PROTECTED, "Not allowed to update /etc/machine-info.");
if (r == -EROFS)
return sd_bus_error_set(error, BUS_ERROR_READ_ONLY_FILESYSTEM, "/etc/machine-info is in a read-only filesystem.");
return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %m");
}
log_info("Changed %s to '%s'",
prop == PROP_PRETTY_HOSTNAME ? "pretty hostname" :
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 int method_get_product_uuid(sd_bus_message *m, void *userdata, sd_bus_error *error) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
Context *c = ASSERT_PTR(userdata);
int interactive, r;
sd_id128_t uuid;
assert(m);
r = sd_bus_message_read(m, "b", &interactive);
if (r < 0)
return r;
r = bus_verify_polkit_async_full(
m,
"org.freedesktop.hostname1.get-product-uuid",
/* details= */ NULL,
/* good_user= */ UID_INVALID,
interactive ? POLKIT_ALLOW_INTERACTIVE : 0,
&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 */
r = id128_get_product(&uuid);
if (r < 0) {
if (r == -EADDRNOTAVAIL)
log_debug_errno(r, "DMI product UUID is all 0x00 or all 0xFF, ignoring.");
else
log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r,
"Failed to read product UUID, ignoring: %m");
return sd_bus_error_set(error, BUS_ERROR_NO_PRODUCT_UUID,
"Failed to read product UUID from firmware.");
}
r = sd_bus_message_new_method_return(m, &reply);
if (r < 0)
return r;
r = sd_bus_message_append_array(reply, 'y', uuid.bytes, sizeof(uuid.bytes));
if (r < 0)
return r;
return sd_bus_send(NULL, reply, NULL);
}
static int method_get_hardware_serial(sd_bus_message *m, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *serial = NULL;
Context *c = ASSERT_PTR(userdata);
int r;
assert(m);
r = bus_verify_polkit_async(
m,
"org.freedesktop.hostname1.get-hardware-serial",
/* details= */ NULL,
&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 */
r = get_hardware_serial(c, &serial);
if (r < 0)
return sd_bus_error_set(error, BUS_ERROR_NO_HARDWARE_SERIAL,
"Failed to read hardware serial from firmware.");
return sd_bus_reply_method_return(m, "s", serial);
}
static int build_describe_response(Context *c, bool privileged, sd_json_variant **ret) {
_cleanup_free_ char *hn = NULL, *dhn = NULL, *in = NULL,
*chassis = NULL, *vendor = NULL, *model = NULL, *serial = NULL, *firmware_version = NULL,
*firmware_vendor = NULL, *chassis_asset_tag = NULL, *sku = NULL, *hardware_version = NULL;
_cleanup_strv_free_ char **os_release_pairs = NULL, **machine_info_pairs = NULL;
usec_t firmware_date = USEC_INFINITY, eol = USEC_INFINITY;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;
sd_id128_t machine_id, boot_id, product_uuid = SD_ID128_NULL;
unsigned local_cid = VMADDR_CID_ANY;
struct utsname u;
int r;
assert(c);
assert(ret);
context_read_etc_hostname(c);
context_read_machine_info(c);
context_read_os_release(c);
context_determine_hostname_source(c);
dhn = get_default_hostname();
if (!dhn)
return log_oom();
r = gethostname_strict(&hn);
if (r < 0 && r != -ENXIO)
return log_error_errno(r, "Failed to read local host name: %m");
if (isempty(c->data[PROP_ICON_NAME]))
in = context_fallback_icon_name(c);
chassis = context_get_chassis(c);
assert_se(uname(&u) >= 0);
if (isempty(c->data[PROP_HARDWARE_VENDOR]))
(void) get_hardware_vendor(c, &vendor);
if (isempty(c->data[PROP_HARDWARE_MODEL]))
(void) get_hardware_model(c, &model);
if (isempty(c->data[PROP_HARDWARE_SKU]))
(void) get_hardware_sku(c, &sku);
if (isempty(c->data[PROP_HARDWARE_VERSION]))
(void) get_hardware_version(c, &hardware_version);
if (privileged) {
/* The product UUID and hardware serial is only available to privileged clients */
(void) id128_get_product(&product_uuid);
(void) get_hardware_serial(c, &serial);
}
(void) get_firmware_version(c, &firmware_version);
(void) get_firmware_vendor(c, &firmware_vendor);
(void) get_firmware_date(c, &firmware_date);
(void) get_chassis_asset_tag(c, &chassis_asset_tag);
if (c->data[PROP_OS_SUPPORT_END])
(void) os_release_support_ended(c->data[PROP_OS_SUPPORT_END], /* quiet= */ false, &eol);
r = sd_id128_get_machine(&machine_id);
if (r < 0)
return log_error_errno(r, "Failed to get machine ID: %m");
r = sd_id128_get_boot(&boot_id);
if (r < 0)
return log_error_errno(r, "Failed to get boot ID: %m");
(void) vsock_get_local_cid(&local_cid);
(void) load_os_release_pairs(/* root= */ NULL, &os_release_pairs);
(void) load_env_file_pairs(/* f=*/ NULL, etc_machine_info(), &machine_info_pairs);
r = sd_json_buildo(
&v,
SD_JSON_BUILD_PAIR_STRING("Hostname", hn ?: dhn),
SD_JSON_BUILD_PAIR_STRING("StaticHostname", c->data[PROP_STATIC_HOSTNAME_SUBSTITUTED_WILDCARDS]),
SD_JSON_BUILD_PAIR_STRING("PrettyHostname", c->data[PROP_PRETTY_HOSTNAME]),
SD_JSON_BUILD_PAIR_STRING("DefaultHostname", dhn),
SD_JSON_BUILD_PAIR_STRING("HostnameSource", hostname_source_to_string(c->hostname_source)),
SD_JSON_BUILD_PAIR_STRING("IconName", in ?: c->data[PROP_ICON_NAME]),
SD_JSON_BUILD_PAIR_STRING("Chassis", chassis),
SD_JSON_BUILD_PAIR_STRING("ChassisAssetTag", chassis_asset_tag),
SD_JSON_BUILD_PAIR_STRING("Deployment", c->data[PROP_DEPLOYMENT]),
SD_JSON_BUILD_PAIR_STRING("Location", c->data[PROP_LOCATION]),
SD_JSON_BUILD_PAIR_STRING("KernelName", u.sysname),
SD_JSON_BUILD_PAIR_STRING("KernelRelease", u.release),
SD_JSON_BUILD_PAIR_STRING("KernelVersion", u.version),
SD_JSON_BUILD_PAIR_STRING("OperatingSystemPrettyName", c->data[PROP_OS_PRETTY_NAME]),
SD_JSON_BUILD_PAIR_STRING("OperatingSystemCPEName", c->data[PROP_OS_CPE_NAME]),
SD_JSON_BUILD_PAIR_STRING("OperatingSystemHomeURL", c->data[PROP_OS_HOME_URL]),
JSON_BUILD_PAIR_FINITE_USEC("OperatingSystemSupportEnd", eol),
SD_JSON_BUILD_PAIR("OperatingSystemReleaseData", JSON_BUILD_STRV_ENV_PAIR(os_release_pairs)),
SD_JSON_BUILD_PAIR_STRING("OperatingSystemImageID", c->data[PROP_OS_IMAGE_ID]),
SD_JSON_BUILD_PAIR_STRING("OperatingSystemImageVersion", c->data[PROP_OS_IMAGE_VERSION]),
SD_JSON_BUILD_PAIR("MachineInformationData", JSON_BUILD_STRV_ENV_PAIR(machine_info_pairs)),
SD_JSON_BUILD_PAIR_STRING("HardwareVendor", vendor ?: c->data[PROP_HARDWARE_VENDOR]),
SD_JSON_BUILD_PAIR_STRING("HardwareModel", model ?: c->data[PROP_HARDWARE_MODEL]),
SD_JSON_BUILD_PAIR_STRING("HardwareSerial", serial),
SD_JSON_BUILD_PAIR_STRING("HardwareSKU", sku ?: c->data[PROP_HARDWARE_SKU]),
SD_JSON_BUILD_PAIR_STRING("HardwareVersion", hardware_version ?: c->data[PROP_HARDWARE_VERSION]),
SD_JSON_BUILD_PAIR_STRING("FirmwareVersion", firmware_version),
SD_JSON_BUILD_PAIR_STRING("FirmwareVendor", firmware_vendor),
JSON_BUILD_PAIR_FINITE_USEC("FirmwareDate", firmware_date),
SD_JSON_BUILD_PAIR_ID128("MachineID", machine_id),
SD_JSON_BUILD_PAIR_ID128("BootID", boot_id),
SD_JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(product_uuid), "ProductUUID", SD_JSON_BUILD_ID128(product_uuid)),
SD_JSON_BUILD_PAIR_CONDITION(sd_id128_is_null(product_uuid), "ProductUUID", SD_JSON_BUILD_NULL),
SD_JSON_BUILD_PAIR_CONDITION(local_cid != VMADDR_CID_ANY, "VSockCID", SD_JSON_BUILD_UNSIGNED(local_cid)),
SD_JSON_BUILD_PAIR_CONDITION(local_cid == VMADDR_CID_ANY, "VSockCID", SD_JSON_BUILD_NULL));
if (r < 0)
return log_error_errno(r, "Failed to build JSON data: %m");
*ret = TAKE_PTR(v);
return 0;
}
static int method_describe(sd_bus_message *m, void *userdata, sd_bus_error *error) {
_cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;
Context *c = ASSERT_PTR(userdata);
_cleanup_free_ char *text = NULL;
bool privileged;
int r;
assert(m);
r = bus_verify_polkit_async(
m,
"org.freedesktop.hostname1.get-description",
/* details= */ NULL,
&c->polkit_registry,
error);
if (r == 0)
return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
/* We ignore all authentication errors here, since most data is unprivileged, the one exception being
* the product ID which we'll check explicitly. */
privileged = r > 0;
r = build_describe_response(c, privileged, &v);
if (r < 0)
return r;
r = sd_json_variant_format(v, 0, &text);
if (r < 0)
return log_error_errno(r, "Failed to format JSON data: %m");
return sd_bus_reply_method_return(m, "s", text);
}
static const sd_bus_vtable hostname_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("Hostname", "s", property_get_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("StaticHostname", "s", property_get_static_hostname, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("PrettyHostname", "s", property_get_machine_info_field, offsetof(Context, data[PROP_PRETTY_HOSTNAME]), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("DefaultHostname", "s", property_get_default_hostname, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("HostnameSource", "s", property_get_hostname_source, 0, 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", property_get_machine_info_field, offsetof(Context, data[PROP_DEPLOYMENT]), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("Location", "s", property_get_machine_info_field, offsetof(Context, data[PROP_LOCATION]), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("KernelName", "s", property_get_uname_field, offsetof(struct utsname, sysname), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("KernelRelease", "s", property_get_uname_field, offsetof(struct utsname, release), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("KernelVersion", "s", property_get_uname_field, offsetof(struct utsname, version), SD_BUS_VTABLE_ABSOLUTE_OFFSET|SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", property_get_os_release_field, offsetof(Context, data[PROP_OS_PRETTY_NAME]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("OperatingSystemCPEName", "s", property_get_os_release_field, offsetof(Context, data[PROP_OS_CPE_NAME]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("OperatingSystemSupportEnd", "t", property_get_os_support_end, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("HomeURL", "s", property_get_os_release_field, offsetof(Context, data[PROP_OS_HOME_URL]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("OperatingSystemImageID", "s", property_get_os_release_field, offsetof(Context, data[PROP_OS_IMAGE_ID]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("OperatingSystemImageVersion", "s", property_get_os_release_field, offsetof(Context, data[PROP_OS_IMAGE_VERSION]), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("HardwareVendor", "s", property_get_hardware_vendor, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("HardwareModel", "s", property_get_hardware_model, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("HardwareSKU", "s", property_get_hardware_sku, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("HardwareVersion", "s", property_get_hardware_version, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("FirmwareVersion", "s", property_get_firmware_version, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("FirmwareVendor", "s", property_get_firmware_vendor, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("FirmwareDate", "t", property_get_firmware_date, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("MachineID", "ay", property_get_machine_id, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("BootID", "ay", property_get_boot_id, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("VSockCID", "u", property_get_vsock_cid, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("ChassisAssetTag", "s", property_get_chassis_asset_tag, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_METHOD_WITH_ARGS("SetHostname",
SD_BUS_ARGS("s", hostname, "b", interactive),
SD_BUS_NO_RESULT,
method_set_hostname,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetStaticHostname",
SD_BUS_ARGS("s", hostname, "b", interactive),
SD_BUS_NO_RESULT,
method_set_static_hostname,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetPrettyHostname",
SD_BUS_ARGS("s", hostname, "b", interactive),
SD_BUS_NO_RESULT,
method_set_pretty_hostname,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetIconName",
SD_BUS_ARGS("s", icon, "b", interactive),
SD_BUS_NO_RESULT,
method_set_icon_name,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetChassis",
SD_BUS_ARGS("s", chassis, "b", interactive),
SD_BUS_NO_RESULT,
method_set_chassis,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetDeployment",
SD_BUS_ARGS("s", deployment, "b", interactive),
SD_BUS_NO_RESULT,
method_set_deployment,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("SetLocation",
SD_BUS_ARGS("s", location, "b", interactive),
SD_BUS_NO_RESULT,
method_set_location,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("GetProductUUID",
SD_BUS_ARGS("b", interactive),
SD_BUS_RESULT("ay", uuid),
method_get_product_uuid,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("GetHardwareSerial",
SD_BUS_NO_ARGS,
SD_BUS_RESULT("s", serial),
method_get_hardware_serial,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD_WITH_ARGS("Describe",
SD_BUS_NO_ARGS,
SD_BUS_RESULT("s", json),
method_describe,
SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_VTABLE_END,
};
static const BusObjectImplementation manager_object = {
"/org/freedesktop/hostname1",
"org.freedesktop.hostname1",
.vtables = BUS_VTABLES(hostname_vtable),
};
static int connect_bus(Context *c) {
int r;
assert(c);
assert(c->event);
assert(!c->bus);
r = sd_bus_default_system(&c->bus);
if (r < 0)
return log_error_errno(r, "Failed to get system bus connection: %m");
r = bus_add_implementation(c->bus, &manager_object, c);
if (r < 0)
return r;
r = bus_log_control_api_register(c->bus);
if (r < 0)
return r;
r = sd_bus_request_name_async(c->bus, NULL, "org.freedesktop.hostname1", 0, NULL, NULL);
if (r < 0)
return log_error_errno(r, "Failed to request name: %m");
r = sd_bus_attach_event(c->bus, c->event, 0);
if (r < 0)
return log_error_errno(r, "Failed to attach bus to event loop: %m");
return 0;
}
static int vl_method_describe(sd_varlink *link, sd_json_variant *parameters, sd_varlink_method_flags_t flags, void *userdata) {
Context *c = ASSERT_PTR(userdata);
bool privileged;
int r;
assert(link);
assert(parameters);
r = sd_varlink_dispatch(link, parameters, dispatch_table_polkit_only, /* userdata= */ NULL);
if (r != 0)
return r;
r = varlink_verify_polkit_async_full(
link,
c->bus,
"org.freedesktop.hostname1.get-hardware-serial",
/* details= */ NULL,
UID_INVALID,
POLKIT_DONT_REPLY,
&c->polkit_registry);
if (r == 0)
return 0; /* No authorization for now, but the async polkit stuff will call us again when it has it */
/* We ignore all authentication errors here, since most data is unprivileged, the one exception being
* the product ID which we'll check explicitly. */
privileged = r > 0;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *v = NULL;
r = build_describe_response(c, privileged, &v);
if (r < 0)
return r;
return sd_varlink_reply(link, v);
}
static int connect_varlink(Context *c) {
int r;
assert(c);
assert(c->event);
assert(!c->varlink_server);
r = varlink_server_new(
&c->varlink_server,
SD_VARLINK_SERVER_ACCOUNT_UID|SD_VARLINK_SERVER_INHERIT_USERDATA,
c);
if (r < 0)
return log_error_errno(r, "Failed to allocate Varlink server: %m");
r = sd_varlink_server_add_interface_many(
c->varlink_server,
&vl_interface_io_systemd_Hostname,
&vl_interface_io_systemd_service);
if (r < 0)
return log_error_errno(r, "Failed to add Hostname interface to Varlink server: %m");
r = sd_varlink_server_bind_method_many(
c->varlink_server,
"io.systemd.Hostname.Describe", vl_method_describe,
"io.systemd.service.Ping", varlink_method_ping,
"io.systemd.service.SetLogLevel", varlink_method_set_log_level,
"io.systemd.service.GetEnvironment", varlink_method_get_environment);
if (r < 0)
return log_error_errno(r, "Failed to bind Varlink method calls: %m");
r = sd_varlink_server_attach_event(c->varlink_server, c->event, SD_EVENT_PRIORITY_NORMAL);
if (r < 0)
return log_error_errno(r, "Failed to attach Varlink server to event loop: %m");
r = sd_varlink_server_listen_auto(c->varlink_server);
if (r < 0)
return log_error_errno(r, "Failed to bind to passed Varlink sockets: %m");
if (r == 0) {
r = sd_varlink_server_listen_address(c->varlink_server, "/run/systemd/io.systemd.Hostname", 0666);
if (r < 0)
return log_error_errno(r, "Failed to bind to Varlink socket: %m");
}
return 0;
}
static bool context_check_idle(void *userdata) {
Context *c = ASSERT_PTR(userdata);
return sd_varlink_server_current_connections(c->varlink_server) == 0 &&
hashmap_isempty(c->polkit_registry);
}
static int run(int argc, char *argv[]) {
_cleanup_(context_destroy) Context context = {
.hostname_source = _HOSTNAME_INVALID, /* appropriate value will be set later */
};
int r;
log_setup();
r = service_parse_argv("systemd-hostnamed.service",
"Manage the system hostname and related metadata.",
BUS_IMPLEMENTATIONS(&manager_object,
&log_control_object),
argc, argv);
if (r <= 0)
return r;
umask(0022);
r = mac_init();
if (r < 0)
return r;
r = context_acquire_dmi_device(&context);
if (r < 0)
return r;
r = context_acquire_acpi_device(&context);
if (r < 0)
return r;
r = context_acquire_device_tree(&context);
if (r < 0)
return r;
r = sd_event_default(&context.event);
if (r < 0)
return log_error_errno(r, "Failed to allocate event loop: %m");
(void) sd_event_set_watchdog(context.event, true);
r = sd_event_set_signal_exit(context.event, true);
if (r < 0)
return log_error_errno(r, "Failed to install SIGINT/SIGTERM handlers: %m");
r = connect_bus(&context);
if (r < 0)
return r;
r = connect_varlink(&context);
if (r < 0)
return r;
r = sd_notify(false, NOTIFY_READY_MESSAGE);
if (r < 0)
log_warning_errno(r, "Failed to send readiness notification, ignoring: %m");
r = bus_event_loop_with_idle(
context.event,
context.bus,
"org.freedesktop.hostname1",
DEFAULT_EXIT_USEC,
context_check_idle,
&context);
if (r < 0)
return log_error_errno(r, "Failed to run event loop: %m");
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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