/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include #include "alloc-util.h" #include "bus-common-errors.h" #include "bus-get-properties.h" #include "bus-log-control-api.h" #include "bus-polkit.h" #include "def.h" #include "env-file-label.h" #include "env-file.h" #include "env-util.h" #include "fileio-label.h" #include "fileio.h" #include "hostname-setup.h" #include "hostname-util.h" #include "id128-util.h" #include "json.h" #include "main-func.h" #include "missing_capability.h" #include "nscd-flush.h" #include "nulstr-util.h" #include "os-util.h" #include "parse-util.h" #include "path-util.h" #include "sd-device.h" #include "selinux-util.h" #include "service-util.h" #include "signal-util.h" #include "stat-util.h" #include "string-table.h" #include "strv.h" #include "user-util.h" #include "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, /* Read from /etc/machine-info */ PROP_PRETTY_HOSTNAME, PROP_ICON_NAME, PROP_CHASSIS, PROP_DEPLOYMENT, PROP_LOCATION, PROP_HARDWARE_VENDOR, PROP_HARDWARE_MODEL, /* Read from /etc/os-release (or /usr/lib/os-release) */ PROP_OS_PRETTY_NAME, PROP_OS_CPE_NAME, PROP_OS_HOME_URL, _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; Hashmap *polkit_registry; } Context; static void context_reset(Context *c, uint64_t mask) { assert(c); for (int p = 0; p < _PROP_MAX; p++) { if (!FLAGS_SET(mask, UINT64_C(1) << p)) continue; c->data[p] = mfree(c->data[p]); } } static void context_destroy(Context *c) { assert(c); context_reset(c, UINT64_MAX); bus_verify_polkit_async_registry_free(c->polkit_registry); } static void context_read_etc_hostname(Context *c) { struct stat current_stat = {}; int r; assert(c); if (stat("/etc/hostname", ¤t_stat) >= 0 && stat_inode_unmodified(&c->etc_hostname_stat, ¤t_stat)) return; context_reset(c, UINT64_C(1) << PROP_STATIC_HOSTNAME); r = read_etc_hostname(NULL, &c->data[PROP_STATIC_HOSTNAME]); if (r < 0 && r != -ENOENT) log_warning_errno(r, "Failed to read /etc/hostname, ignoring: %m"); 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", ¤t_stat) >= 0 && stat_inode_unmodified(&c->etc_machine_info_stat, ¤t_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)); 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]); 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) { struct stat current_stat = {}; int r; assert(c); if ((stat("/etc/os-release", ¤t_stat) >= 0 || stat("/usr/lib/os-release", ¤t_stat) >= 0) && stat_inode_unmodified(&c->etc_os_release_stat, ¤t_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)); r = parse_os_release(NULL, "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME], "CPE_NAME", &c->data[PROP_OS_CPE_NAME], "HOME_URL", &c->data[PROP_OS_HOME_URL]); if (r < 0 && r != -ENOENT) log_warning_errno(r, "Failed to read os-release file, ignoring: %m"); 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 get_dmi_data(const char *database_key, const char *regular_key, char **ret) { _cleanup_(sd_device_unrefp) sd_device *device = NULL; _cleanup_free_ char *b = NULL; const char *s = NULL; int r; if (!use_dmi_data()) return -ENOENT; r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id"); if (r < 0) return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m"); if (database_key) (void) sd_device_get_property_value(device, database_key, &s); if (!s && regular_key) (void) sd_device_get_property_value(device, regular_key, &s); if (!ret) return !!s; if (s) { b = strdup(s); if (!b) return -ENOMEM; } *ret = TAKE_PTR(b); return !!s; } static int get_hardware_vendor(char **ret) { return get_dmi_data("ID_VENDOR_FROM_DATABASE", "ID_VENDOR", ret); } static int get_hardware_model(char **ret) { return get_dmi_data("ID_MODEL_FROM_DATABASE", "ID_MODEL", ret); } static int get_hardware_firmware_data(const char *sysattr, char **ret) { _cleanup_(sd_device_unrefp) sd_device *device = NULL; _cleanup_free_ char *b = NULL; const char *s = NULL; int r; assert(sysattr); if (!use_dmi_data()) return -ENOENT; r = sd_device_new_from_syspath(&device, "/sys/class/dmi/id"); if (r < 0) return log_debug_errno(r, "Failed to open /sys/class/dmi/id device, ignoring: %m"); (void) sd_device_get_sysattr_value(device, sysattr, &s); if (!isempty(s)) { b = strdup(s); if (!b) return -ENOMEM; } if (ret) *ret = TAKE_PTR(b); return !isempty(s); } static int get_hardware_serial(char **ret) { int r; r = get_hardware_firmware_data("product_serial", ret); if (r <= 0) return get_hardware_firmware_data("board_serial", ret); return r; } static int get_firmware_version(char **ret) { return get_hardware_firmware_data("bios_version", ret); } 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(void) { const char *chassis; _cleanup_free_ char *type = NULL; Virtualization v; unsigned t; int r; v = detect_virtualization(); if (v < 0) log_debug_errno(v, "Failed to detect virtualization, ignoring: %m"); else if (VIRTUALIZATION_IS_VM(v)) return "vm"; else if (VIRTUALIZATION_IS_CONTAINER(v)) return "container"; r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type); if (r < 0) { log_debug_errno(r, "Failed to read DMI chassis type, ignoring: %m"); goto try_acpi; } r = safe_atou(type, &t); if (r < 0) { log_debug_errno(r, "Failed to parse DMI chassis type \"%s\", ignoring: %m", type); goto try_acpi; } /* 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); } try_acpi: type = mfree(type); r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type); if (r < 0) { log_debug_errno(r, "Failed read ACPI PM profile, ignoring: %m"); goto try_devicetree; } r = safe_atou(type, &t); if (r < 0) { log_debug_errno(r, "Failed parse ACPI PM profile \"%s\", ignoring: %m", type); goto try_devicetree; } /* 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); } try_devicetree: type = mfree(type); r = read_one_line_file("/proc/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 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_data("ID_CHASSIS", NULL, &dmi) > 0) return dmi; fallback = fallback_chassis(); 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_hn) { _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]) { hn = c->data[PROP_STATIC_HOSTNAME]; hns = HOSTNAME_STATIC; /* ... the transient hostname, (ie: DHCP) comes next ... */ } else if (transient_hn) { hn = transient_hn; 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; } (void) nscd_flush_cache(STRV_MAKE("hosts")); 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_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]); 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 (int 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_label("/etc/machine-info", l); 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)(char **)) { _cleanup_free_ char *from_dmi = NULL; assert(reply); assert(c); assert(IN_SET(prop, PROP_HARDWARE_VENDOR, PROP_HARDWARE_MODEL)); assert(getter); context_read_machine_info(c); if (isempty(c->data[prop])) (void) getter(&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_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; (void) get_firmware_version(&firmware_version); return sd_bus_message_append(reply, "s", firmware_version); } 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]); } 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])) 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_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 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. */ if (name && !hostname_is_valid(name, 0)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name); context_read_etc_hostname(c); 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 */ 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; int 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); if (name && !hostname_is_valid(name, 0)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name); 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 */ r = free_and_strdup_warn(&c->data[PROP_STATIC_HOSTNAME], name); if (r < 0) return r; 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, 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( 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 */ 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( m, CAP_SYS_ADMIN, "org.freedesktop.hostname1.get-product-uuid", 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 */ 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_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; _cleanup_free_ char *serial = NULL; Context *c = ASSERT_PTR(userdata); int r; assert(m); r = bus_verify_polkit_async( m, CAP_SYS_ADMIN, "org.freedesktop.hostname1.get-hardware-serial", NULL, false, 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 */ r = get_hardware_serial(&serial); if (r < 0) return r; r = sd_bus_message_new_method_return(m, &reply); if (r < 0) return r; r = sd_bus_message_append(reply, "s", serial); if (r < 0) return r; return sd_bus_send(NULL, reply, NULL); } static int method_describe(sd_bus_message *m, void *userdata, sd_bus_error *error) { _cleanup_free_ char *hn = NULL, *dhn = NULL, *in = NULL, *text = NULL, *chassis = NULL, *vendor = NULL, *model = NULL, *serial = NULL, *firmware_version = NULL; _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; _cleanup_(json_variant_unrefp) JsonVariant *v = NULL; sd_id128_t product_uuid = SD_ID128_NULL; Context *c = ASSERT_PTR(userdata); bool privileged; struct utsname u; int r; assert(m); r = bus_verify_polkit_async( m, CAP_SYS_ADMIN, "org.freedesktop.hostname1.get-description", NULL, false, UID_INVALID, &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; context_read_etc_hostname(c); context_read_machine_info(c); context_read_os_release(c); context_determine_hostname_source(c); r = gethostname_strict(&hn); if (r < 0) { if (r != -ENXIO) return log_error_errno(r, "Failed to read local host name: %m"); hn = get_default_hostname(); if (!hn) return log_oom(); } dhn = get_default_hostname(); if (!dhn) return log_oom(); 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(&vendor); if (isempty(c->data[PROP_HARDWARE_MODEL])) (void) get_hardware_model(&model); if (privileged) { /* The product UUID and hardware serial is only available to privileged clients */ (void) id128_get_product(&product_uuid); (void) get_hardware_serial(&serial); } (void) get_firmware_version(&firmware_version); r = json_build(&v, JSON_BUILD_OBJECT( JSON_BUILD_PAIR("Hostname", JSON_BUILD_STRING(hn)), JSON_BUILD_PAIR("StaticHostname", JSON_BUILD_STRING(c->data[PROP_STATIC_HOSTNAME])), JSON_BUILD_PAIR("PrettyHostname", JSON_BUILD_STRING(c->data[PROP_PRETTY_HOSTNAME])), JSON_BUILD_PAIR("DefaultHostname", JSON_BUILD_STRING(dhn)), JSON_BUILD_PAIR("HostnameSource", JSON_BUILD_STRING(hostname_source_to_string(c->hostname_source))), JSON_BUILD_PAIR("IconName", JSON_BUILD_STRING(in ?: c->data[PROP_ICON_NAME])), JSON_BUILD_PAIR("Chassis", JSON_BUILD_STRING(chassis)), JSON_BUILD_PAIR("Deployment", JSON_BUILD_STRING(c->data[PROP_DEPLOYMENT])), JSON_BUILD_PAIR("Location", JSON_BUILD_STRING(c->data[PROP_LOCATION])), JSON_BUILD_PAIR("KernelName", JSON_BUILD_STRING(u.sysname)), JSON_BUILD_PAIR("KernelRelease", JSON_BUILD_STRING(u.release)), JSON_BUILD_PAIR("KernelVersion", JSON_BUILD_STRING(u.version)), JSON_BUILD_PAIR("OperatingSystemPrettyName", JSON_BUILD_STRING(c->data[PROP_OS_PRETTY_NAME])), JSON_BUILD_PAIR("OperatingSystemCPEName", JSON_BUILD_STRING(c->data[PROP_OS_CPE_NAME])), JSON_BUILD_PAIR("OperatingSystemHomeURL", JSON_BUILD_STRING(c->data[PROP_OS_HOME_URL])), JSON_BUILD_PAIR("HardwareVendor", JSON_BUILD_STRING(vendor ?: c->data[PROP_HARDWARE_VENDOR])), JSON_BUILD_PAIR("HardwareModel", JSON_BUILD_STRING(model ?: c->data[PROP_HARDWARE_MODEL])), JSON_BUILD_PAIR("HardwareSerial", JSON_BUILD_STRING(serial)), JSON_BUILD_PAIR("FirmwareVersion", JSON_BUILD_STRING(firmware_version)), JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_ID128(product_uuid)), JSON_BUILD_PAIR_CONDITION(sd_id128_is_null(product_uuid), "ProductUUID", JSON_BUILD_NULL))); if (r < 0) return log_error_errno(r, "Failed to build JSON data: %m"); r = json_variant_format(v, 0, &text); if (r < 0) return log_error_errno(r, "Failed to format JSON data: %m"); r = sd_bus_message_new_method_return(m, &reply); if (r < 0) return r; r = sd_bus_message_append(reply, "s", text); if (r < 0) return r; return sd_bus_send(NULL, reply, NULL); } 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) + sizeof(char*) * 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) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE), SD_BUS_PROPERTY("Location", "s", property_get_machine_info_field, offsetof(Context, data) + sizeof(char*) * 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) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("OperatingSystemCPEName", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST), SD_BUS_PROPERTY("HomeURL", "s", property_get_os_release_field, offsetof(Context, data) + sizeof(char*) * PROP_OS_HOME_URL, 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("FirmwareVersion", "s", property_get_firmware_version, 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, sd_event *event, sd_bus **ret) { _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; int r; assert(c); assert(event); assert(ret); r = sd_bus_default_system(&bus); if (r < 0) return log_error_errno(r, "Failed to get system bus connection: %m"); r = bus_add_implementation(bus, &manager_object, c); if (r < 0) return r; r = bus_log_control_api_register(bus); if (r < 0) return r; r = sd_bus_request_name_async(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(bus, event, 0); if (r < 0) return log_error_errno(r, "Failed to attach bus to event loop: %m"); *ret = TAKE_PTR(bus); return 0; } static int run(int argc, char *argv[]) { _cleanup_(context_destroy) Context context = { .hostname_source = _HOSTNAME_INVALID, /* appropriate value will be set later */ }; _cleanup_(sd_event_unrefp) sd_event *event = NULL; _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; 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_selinux_init(); if (r < 0) return r; assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0); r = sd_event_default(&event); if (r < 0) return log_error_errno(r, "Failed to allocate event loop: %m"); (void) sd_event_set_watchdog(event, true); r = sd_event_add_signal(event, NULL, SIGINT, NULL, NULL); if (r < 0) return log_error_errno(r, "Failed to install SIGINT handler: %m"); r = sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL); if (r < 0) return log_error_errno(r, "Failed to install SIGTERM handler: %m"); r = connect_bus(&context, event, &bus); if (r < 0) return r; r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL); if (r < 0) return log_error_errno(r, "Failed to run event loop: %m"); return 0; } DEFINE_MAIN_FUNCTION(run);