1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/utsname.h>
32 #include "fileio-label.h"
35 #include "event-util.h"
36 #include "selinux-util.h"
38 #define VALID_DEPLOYMENT_CHARS (DIGITS LETTERS "-.:")
56 typedef struct Context {
57 char *data[_PROP_MAX];
58 Hashmap *polkit_registry;
61 static void context_reset(Context *c) {
66 for (p = 0; p < _PROP_MAX; p++) {
72 static void context_free(Context *c) {
76 bus_verify_polkit_async_registry_free(c->polkit_registry);
79 static int context_read_data(Context *c) {
87 assert_se(uname(&u) >= 0);
88 c->data[PROP_KERNEL_NAME] = strdup(u.sysname);
89 c->data[PROP_KERNEL_RELEASE] = strdup(u.release);
90 c->data[PROP_KERNEL_VERSION] = strdup(u.version);
91 if (!c->data[PROP_KERNEL_NAME] || !c->data[PROP_KERNEL_RELEASE] ||
92 !c->data[PROP_KERNEL_VERSION])
95 c->data[PROP_HOSTNAME] = gethostname_malloc();
96 if (!c->data[PROP_HOSTNAME])
99 r = read_one_line_file("/etc/hostname", &c->data[PROP_STATIC_HOSTNAME]);
100 if (r < 0 && r != -ENOENT)
103 r = parse_env_file("/etc/machine-info", NEWLINE,
104 "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
105 "ICON_NAME", &c->data[PROP_ICON_NAME],
106 "CHASSIS", &c->data[PROP_CHASSIS],
107 "DEPLOYMENT", &c->data[PROP_DEPLOYMENT],
108 "LOCATION", &c->data[PROP_LOCATION],
110 if (r < 0 && r != -ENOENT)
113 r = parse_env_file("/etc/os-release", NEWLINE,
114 "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
115 "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
118 r = parse_env_file("/usr/lib/os-release", NEWLINE,
119 "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
120 "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
124 if (r < 0 && r != -ENOENT)
130 static bool valid_chassis(const char *chassis) {
133 return nulstr_contains(
146 static bool valid_deployment(const char *deployment) {
149 return in_charset(deployment, VALID_DEPLOYMENT_CHARS);
152 static const char* fallback_chassis(void) {
158 v = detect_virtualization(NULL);
160 if (v == VIRTUALIZATION_VM)
162 if (v == VIRTUALIZATION_CONTAINER)
165 r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);
169 r = safe_atou(type, &t);
174 /* We only list the really obvious cases here as the ACPI data
175 * is not really super reliable.
177 * See the ACPI 5.0 Spec Section 5.2.9.1 for details:
179 * http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf
202 r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);
206 r = safe_atou(type, &t);
211 /* We only list the really obvious cases here. The DMI data is
212 unreliable enough, so let's not do any additional guesswork
215 See the SMBIOS Specification 2.7.1 section 7.4.1 for
216 details about the values listed here:
218 http://www.dmtf.org/sites/default/files/standards/documents/DSP0134_2.7.1.pdf
246 static char* context_fallback_icon_name(Context *c) {
251 if (!isempty(c->data[PROP_CHASSIS]))
252 return strappend("computer-", c->data[PROP_CHASSIS]);
254 chassis = fallback_chassis();
256 return strappend("computer-", chassis);
258 return strdup("computer");
262 static bool hostname_is_useful(const char *hn) {
263 return !isempty(hn) && !is_localhost(hn);
266 static int context_update_kernel_hostname(Context *c) {
267 const char *static_hn;
272 static_hn = c->data[PROP_STATIC_HOSTNAME];
274 /* /etc/hostname with something other than "localhost"
275 * has the highest preference ... */
276 if (hostname_is_useful(static_hn))
279 /* ... the transient host name, (ie: DHCP) comes next ... */
280 else if (!isempty(c->data[PROP_HOSTNAME]))
281 hn = c->data[PROP_HOSTNAME];
283 /* ... fallback to static "localhost.*" ignored above ... */
284 else if (!isempty(static_hn))
287 /* ... and the ultimate fallback */
291 if (sethostname_idempotent(hn) < 0)
297 static int context_write_data_static_hostname(Context *c) {
301 if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
303 if (unlink("/etc/hostname") < 0)
304 return errno == ENOENT ? 0 : -errno;
308 return write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
311 static int context_write_data_machine_info(Context *c) {
313 static const char * const name[_PROP_MAX] = {
314 [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
315 [PROP_ICON_NAME] = "ICON_NAME",
316 [PROP_CHASSIS] = "CHASSIS",
317 [PROP_DEPLOYMENT] = "DEPLOYMENT",
318 [PROP_LOCATION] = "LOCATION",
321 _cleanup_strv_free_ char **l = NULL;
326 r = load_env_file(NULL, "/etc/machine-info", NULL, &l);
327 if (r < 0 && r != -ENOENT)
330 for (p = PROP_PRETTY_HOSTNAME; p <= PROP_LOCATION; p++) {
331 _cleanup_free_ char *t = NULL;
336 if (isempty(c->data[p])) {
337 strv_env_unset(l, name[p]);
341 t = strjoin(name[p], "=", c->data[p], NULL);
345 u = strv_env_set(l, t);
353 if (strv_isempty(l)) {
354 if (unlink("/etc/machine-info") < 0)
355 return errno == ENOENT ? 0 : -errno;
360 return write_env_file_label("/etc/machine-info", l);
363 static int property_get_icon_name(
366 const char *interface,
367 const char *property,
368 sd_bus_message *reply,
370 sd_bus_error *error) {
372 _cleanup_free_ char *n = NULL;
373 Context *c = userdata;
376 if (isempty(c->data[PROP_ICON_NAME]))
377 name = n = context_fallback_icon_name(c);
379 name = c->data[PROP_ICON_NAME];
384 return sd_bus_message_append(reply, "s", name);
387 static int property_get_chassis(
390 const char *interface,
391 const char *property,
392 sd_bus_message *reply,
394 sd_bus_error *error) {
396 Context *c = userdata;
399 if (isempty(c->data[PROP_CHASSIS]))
400 name = fallback_chassis();
402 name = c->data[PROP_CHASSIS];
404 return sd_bus_message_append(reply, "s", name);
407 static int method_set_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
408 Context *c = userdata;
414 r = sd_bus_message_read(m, "sb", &name, &interactive);
419 name = c->data[PROP_STATIC_HOSTNAME];
424 if (!hostname_is_valid(name))
425 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
427 if (streq_ptr(name, c->data[PROP_HOSTNAME]))
428 return sd_bus_reply_method_return(m, NULL);
430 r = bus_verify_polkit_async(
433 "org.freedesktop.hostname1.set-hostname",
441 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
447 free(c->data[PROP_HOSTNAME]);
448 c->data[PROP_HOSTNAME] = h;
450 r = context_update_kernel_hostname(c);
452 log_error_errno(r, "Failed to set host name: %m");
453 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
456 log_info("Changed host name to '%s'", strna(c->data[PROP_HOSTNAME]));
458 sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "Hostname", NULL);
460 return sd_bus_reply_method_return(m, NULL);
463 static int method_set_static_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
464 Context *c = userdata;
469 r = sd_bus_message_read(m, "sb", &name, &interactive);
476 if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
477 return sd_bus_reply_method_return(m, NULL);
479 r = bus_verify_polkit_async(
482 "org.freedesktop.hostname1.set-static-hostname",
490 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
493 free(c->data[PROP_STATIC_HOSTNAME]);
494 c->data[PROP_STATIC_HOSTNAME] = NULL;
498 if (!hostname_is_valid(name))
499 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
505 free(c->data[PROP_STATIC_HOSTNAME]);
506 c->data[PROP_STATIC_HOSTNAME] = h;
509 r = context_update_kernel_hostname(c);
511 log_error_errno(r, "Failed to set host name: %m");
512 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
515 r = context_write_data_static_hostname(c);
517 log_error_errno(r, "Failed to write static host name: %m");
518 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %s", strerror(-r));
521 log_info("Changed static host name to '%s'", strna(c->data[PROP_STATIC_HOSTNAME]));
523 sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "StaticHostname", NULL);
525 return sd_bus_reply_method_return(m, NULL);
528 static int set_machine_info(Context *c, sd_bus *bus, sd_bus_message *m, int prop, sd_bus_message_handler_t cb, sd_bus_error *error) {
537 r = sd_bus_message_read(m, "sb", &name, &interactive);
544 if (streq_ptr(name, c->data[prop]))
545 return sd_bus_reply_method_return(m, NULL);
547 /* Since the pretty hostname should always be changed at the
548 * same time as the static one, use the same policy action for
551 r = bus_verify_polkit_async(
554 prop == PROP_PRETTY_HOSTNAME ? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
562 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
566 c->data[prop] = NULL;
570 /* The icon name might ultimately be used as file
571 * name, so better be safe than sorry */
573 if (prop == PROP_ICON_NAME && !filename_is_valid(name))
574 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
575 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
576 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty host name '%s'", name);
577 if (prop == PROP_CHASSIS && !valid_chassis(name))
578 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
579 if (prop == PROP_DEPLOYMENT && !valid_deployment(name))
580 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid deployment '%s'", name);
581 if (prop == PROP_LOCATION && string_has_cc(name, NULL))
582 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid location '%s'", name);
592 r = context_write_data_machine_info(c);
594 log_error_errno(r, "Failed to write machine info: %m");
595 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %s", strerror(-r));
598 log_info("Changed %s to '%s'",
599 prop == PROP_PRETTY_HOSTNAME ? "pretty host name" :
600 prop == PROP_DEPLOYMENT ? "deployment" :
601 prop == PROP_LOCATION ? "location" :
602 prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
604 sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
605 prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
606 prop == PROP_DEPLOYMENT ? "Deployment" :
607 prop == PROP_LOCATION ? "Location" :
608 prop == PROP_CHASSIS ? "Chassis" : "IconName" , NULL);
610 return sd_bus_reply_method_return(m, NULL);
613 static int method_set_pretty_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
614 return set_machine_info(userdata, bus, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
617 static int method_set_icon_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
618 return set_machine_info(userdata, bus, m, PROP_ICON_NAME, method_set_icon_name, error);
621 static int method_set_chassis(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
622 return set_machine_info(userdata, bus, m, PROP_CHASSIS, method_set_chassis, error);
625 static int method_set_deployment(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
626 return set_machine_info(userdata, bus, m, PROP_DEPLOYMENT, method_set_deployment, error);
629 static int method_set_location(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
630 return set_machine_info(userdata, bus, m, PROP_LOCATION, method_set_location, error);
633 static const sd_bus_vtable hostname_vtable[] = {
634 SD_BUS_VTABLE_START(0),
635 SD_BUS_PROPERTY("Hostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
636 SD_BUS_PROPERTY("StaticHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_STATIC_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
637 SD_BUS_PROPERTY("PrettyHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
638 SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
639 SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
640 SD_BUS_PROPERTY("Deployment", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_DEPLOYMENT, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
641 SD_BUS_PROPERTY("Location", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_LOCATION, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
642 SD_BUS_PROPERTY("KernelName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
643 SD_BUS_PROPERTY("KernelRelease", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_RELEASE, SD_BUS_VTABLE_PROPERTY_CONST),
644 SD_BUS_PROPERTY("KernelVersion", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_VERSION, SD_BUS_VTABLE_PROPERTY_CONST),
645 SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
646 SD_BUS_PROPERTY("OperatingSystemCPEName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
647 SD_BUS_METHOD("SetHostname", "sb", NULL, method_set_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
648 SD_BUS_METHOD("SetStaticHostname", "sb", NULL, method_set_static_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
649 SD_BUS_METHOD("SetPrettyHostname", "sb", NULL, method_set_pretty_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
650 SD_BUS_METHOD("SetIconName", "sb", NULL, method_set_icon_name, SD_BUS_VTABLE_UNPRIVILEGED),
651 SD_BUS_METHOD("SetChassis", "sb", NULL, method_set_chassis, SD_BUS_VTABLE_UNPRIVILEGED),
652 SD_BUS_METHOD("SetDeployment", "sb", NULL, method_set_deployment, SD_BUS_VTABLE_UNPRIVILEGED),
653 SD_BUS_METHOD("SetLocation", "sb", NULL, method_set_location, SD_BUS_VTABLE_UNPRIVILEGED),
657 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
658 _cleanup_bus_close_unref_ sd_bus *bus = NULL;
665 r = sd_bus_default_system(&bus);
667 return log_error_errno(r, "Failed to get system bus connection: %m");
669 r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", hostname_vtable, c);
671 return log_error_errno(r, "Failed to register object: %m");
673 r = sd_bus_request_name(bus, "org.freedesktop.hostname1", 0);
675 return log_error_errno(r, "Failed to register name: %m");
677 r = sd_bus_attach_event(bus, event, 0);
679 return log_error_errno(r, "Failed to attach bus to event loop: %m");
687 int main(int argc, char *argv[]) {
688 Context context = {};
689 _cleanup_event_unref_ sd_event *event = NULL;
690 _cleanup_bus_close_unref_ sd_bus *bus = NULL;
693 log_set_target(LOG_TARGET_AUTO);
694 log_parse_environment();
698 mac_selinux_init("/etc");
701 log_error("This program takes no arguments.");
707 log_error("This program takes no arguments.");
712 r = sd_event_default(&event);
714 log_error_errno(r, "Failed to allocate event loop: %m");
718 sd_event_set_watchdog(event, true);
720 r = connect_bus(&context, event, &bus);
724 r = context_read_data(&context);
726 log_error_errno(r, "Failed to read hostname and machine information: %m");
730 r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
732 log_error_errno(r, "Failed to run event loop: %m");
737 context_free(&context);
739 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;