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/>.
26 #include <sys/utsname.h>
33 #include "fileio-label.h"
36 #include "event-util.h"
52 typedef struct Context {
53 char *data[_PROP_MAX];
54 Hashmap *polkit_registry;
57 static void context_reset(Context *c) {
62 for (p = 0; p < _PROP_MAX; p++) {
68 static void context_free(Context *c, sd_bus *bus) {
72 bus_verify_polkit_async_registry_free(bus, c->polkit_registry);
75 static int context_read_data(Context *c) {
83 assert_se(uname(&u) >= 0);
84 c->data[PROP_KERNEL_NAME] = strdup(u.sysname);
85 c->data[PROP_KERNEL_RELEASE] = strdup(u.release);
86 c->data[PROP_KERNEL_VERSION] = strdup(u.version);
87 if (!c->data[PROP_KERNEL_NAME] || !c->data[PROP_KERNEL_RELEASE] ||
88 !c->data[PROP_KERNEL_VERSION])
91 c->data[PROP_HOSTNAME] = gethostname_malloc();
92 if (!c->data[PROP_HOSTNAME])
95 r = read_one_line_file("/etc/hostname", &c->data[PROP_STATIC_HOSTNAME]);
96 if (r < 0 && r != -ENOENT)
99 r = parse_env_file("/etc/machine-info", NEWLINE,
100 "PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],
101 "ICON_NAME", &c->data[PROP_ICON_NAME],
102 "CHASSIS", &c->data[PROP_CHASSIS],
104 if (r < 0 && r != -ENOENT)
107 r = parse_env_file("/etc/os-release", NEWLINE,
108 "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
109 "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
112 r = parse_env_file("/usr/lib/os-release", NEWLINE,
113 "PRETTY_NAME", &c->data[PROP_OS_PRETTY_NAME],
114 "CPE_NAME", &c->data[PROP_OS_CPE_NAME],
118 if (r < 0 && r != -ENOENT)
124 static bool check_nss(void) {
127 dl = dlopen("libnss_myhostname.so.2", RTLD_LAZY);
136 static bool valid_chassis(const char *chassis) {
140 return nulstr_contains(
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");
261 static bool hostname_is_useful(const char *hn) {
262 return !isempty(hn) && !is_localhost(hn);
265 static int context_update_kernel_hostname(Context *c) {
266 const char *static_hn;
271 static_hn = c->data[PROP_STATIC_HOSTNAME];
273 /* /etc/hostname with something other than "localhost"
274 * has the highest preference ... */
275 if (hostname_is_useful(static_hn))
278 /* ... the transient host name, (ie: DHCP) comes next ...*/
279 else if (!isempty(c->data[PROP_HOSTNAME]))
280 hn = c->data[PROP_HOSTNAME];
282 /* ... fallback to static "localhost.*" ignored above ... */
283 else if (!isempty(static_hn))
286 /* ... and the ultimate fallback */
290 if (sethostname(hn, strlen(hn)) < 0)
296 static int context_write_data_static_hostname(Context *c) {
300 if (isempty(c->data[PROP_STATIC_HOSTNAME])) {
302 if (unlink("/etc/hostname") < 0)
303 return errno == ENOENT ? 0 : -errno;
307 return write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);
310 static int context_write_data_machine_info(Context *c) {
312 static const char * const name[_PROP_MAX] = {
313 [PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",
314 [PROP_ICON_NAME] = "ICON_NAME",
315 [PROP_CHASSIS] = "CHASSIS"
318 _cleanup_strv_free_ char **l = NULL;
323 r = load_env_file(NULL, "/etc/machine-info", NULL, &l);
324 if (r < 0 && r != -ENOENT)
327 for (p = PROP_PRETTY_HOSTNAME; p <= PROP_CHASSIS; p++) {
332 if (isempty(c->data[p])) {
333 strv_env_unset(l, name[p]);
337 if (asprintf(&t, "%s=%s", name[p], strempty(c->data[p])) < 0)
340 u = strv_env_set(l, t);
350 if (strv_isempty(l)) {
352 if (unlink("/etc/machine-info") < 0)
353 return errno == ENOENT ? 0 : -errno;
358 return write_env_file_label("/etc/machine-info", l);
361 static int property_get_icon_name(
364 const char *interface,
365 const char *property,
366 sd_bus_message *reply,
368 sd_bus_error *error) {
370 _cleanup_free_ char *n = NULL;
371 Context *c = userdata;
374 if (isempty(c->data[PROP_ICON_NAME]))
375 name = n = context_fallback_icon_name(c);
377 name = c->data[PROP_ICON_NAME];
382 return sd_bus_message_append(reply, "s", name);
385 static int property_get_chassis(
388 const char *interface,
389 const char *property,
390 sd_bus_message *reply,
392 sd_bus_error *error) {
394 Context *c = userdata;
397 if (isempty(c->data[PROP_CHASSIS]))
398 name = fallback_chassis();
400 name = c->data[PROP_CHASSIS];
402 return sd_bus_message_append(reply, "s", name);
405 static int method_set_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
406 Context *c = userdata;
412 r = sd_bus_message_read(m, "sb", &name, &interactive);
417 name = c->data[PROP_STATIC_HOSTNAME];
422 if (!hostname_is_valid(name))
423 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);
425 if (streq_ptr(name, c->data[PROP_HOSTNAME]))
426 return sd_bus_reply_method_return(m, NULL);
428 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.hostname1.set-hostname", interactive, error, method_set_hostname, c);
432 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
438 free(c->data[PROP_HOSTNAME]);
439 c->data[PROP_HOSTNAME] = h;
441 r = context_update_kernel_hostname(c);
443 log_error("Failed to set host name: %s", strerror(-r));
444 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
447 log_info("Changed host name to '%s'", strna(c->data[PROP_HOSTNAME]));
449 sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "Hostname", NULL);
451 return sd_bus_reply_method_return(m, NULL);
454 static int method_set_static_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
455 Context *c = userdata;
460 r = sd_bus_message_read(m, "sb", &name, &interactive);
467 if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))
468 return sd_bus_reply_method_return(m, NULL);
470 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.hostname1.set-static-hostname", interactive, error, method_set_static_hostname, c);
474 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
477 free(c->data[PROP_STATIC_HOSTNAME]);
478 c->data[PROP_STATIC_HOSTNAME] = NULL;
482 if (!hostname_is_valid(name))
483 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);
489 free(c->data[PROP_STATIC_HOSTNAME]);
490 c->data[PROP_STATIC_HOSTNAME] = h;
493 r = context_update_kernel_hostname(c);
495 log_error("Failed to set host name: %s", strerror(-r));
496 return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));
499 r = context_write_data_static_hostname(c);
501 log_error("Failed to write static host name: %s", strerror(-r));
502 return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %s", strerror(-r));
505 log_info("Changed static host name to '%s'", strna(c->data[PROP_STATIC_HOSTNAME]));
507 sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "StaticHostname", NULL);
509 return sd_bus_reply_method_return(m, NULL);
512 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) {
521 r = sd_bus_message_read(m, "sb", &name, &interactive);
528 if (streq_ptr(name, c->data[prop]))
529 return sd_bus_reply_method_return(m, NULL);
531 /* Since the pretty hostname should always be changed at the
532 * same time as the static one, use the same policy action for
535 r = bus_verify_polkit_async(bus, &c->polkit_registry, m, prop == PROP_PRETTY_HOSTNAME ?
536 "org.freedesktop.hostname1.set-static-hostname" :
537 "org.freedesktop.hostname1.set-machine-info", interactive, error, cb, c);
541 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
545 c->data[prop] = NULL;
549 /* The icon name might ultimately be used as file
550 * name, so better be safe than sorry */
552 if (prop == PROP_ICON_NAME && !filename_is_safe(name))
553 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid icon name '%s'", name);
554 if (prop == PROP_PRETTY_HOSTNAME && string_has_cc(name, NULL))
555 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty host name '%s'", name);
556 if (prop == PROP_CHASSIS && !valid_chassis(name))
557 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);
567 r = context_write_data_machine_info(c);
569 log_error("Failed to write machine info: %s", strerror(-r));
570 return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %s", strerror(-r));
573 log_info("Changed %s to '%s'",
574 prop == PROP_PRETTY_HOSTNAME ? "pretty host name" :
575 prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));
577 sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1",
578 prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :
579 prop == PROP_CHASSIS ? "Chassis" : "IconName", NULL);
581 return sd_bus_reply_method_return(m, NULL);
584 static int method_set_pretty_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
585 return set_machine_info(userdata, bus, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);
588 static int method_set_icon_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
589 return set_machine_info(userdata, bus, m, PROP_ICON_NAME, method_set_icon_name, error);
592 static int method_set_chassis(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {
593 return set_machine_info(userdata, bus, m, PROP_CHASSIS, method_set_chassis, error);
596 static const sd_bus_vtable hostname_vtable[] = {
597 SD_BUS_VTABLE_START(0),
598 SD_BUS_PROPERTY("Hostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_HOSTNAME, 0),
599 SD_BUS_PROPERTY("StaticHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_STATIC_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
600 SD_BUS_PROPERTY("PrettyHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
601 SD_BUS_PROPERTY("IconName", "s", property_get_icon_name, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
602 SD_BUS_PROPERTY("Chassis", "s", property_get_chassis, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
603 SD_BUS_PROPERTY("KernelName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
604 SD_BUS_PROPERTY("KernelRelease", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_RELEASE, SD_BUS_VTABLE_PROPERTY_CONST),
605 SD_BUS_PROPERTY("KernelVersion", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_KERNEL_VERSION, SD_BUS_VTABLE_PROPERTY_CONST),
606 SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_PRETTY_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
607 SD_BUS_PROPERTY("OperatingSystemCPEName", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_OS_CPE_NAME, SD_BUS_VTABLE_PROPERTY_CONST),
608 SD_BUS_METHOD("SetHostname", "sb", NULL, method_set_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
609 SD_BUS_METHOD("SetStaticHostname", "sb", NULL, method_set_static_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
610 SD_BUS_METHOD("SetPrettyHostname", "sb", NULL, method_set_pretty_hostname, SD_BUS_VTABLE_UNPRIVILEGED),
611 SD_BUS_METHOD("SetIconName", "sb", NULL, method_set_icon_name, SD_BUS_VTABLE_UNPRIVILEGED),
612 SD_BUS_METHOD("SetChassis", "sb", NULL, method_set_chassis, SD_BUS_VTABLE_UNPRIVILEGED),
616 static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {
617 _cleanup_bus_unref_ sd_bus *bus = NULL;
624 r = sd_bus_default_system(&bus);
626 log_error("Failed to get system bus connection: %s", strerror(-r));
630 r = sd_bus_add_object_vtable(bus, NULL, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", hostname_vtable, c);
632 log_error("Failed to register object: %s", strerror(-r));
636 r = sd_bus_request_name(bus, "org.freedesktop.hostname1", 0);
638 log_error("Failed to register name: %s", strerror(-r));
642 r = sd_bus_attach_event(bus, event, 0);
644 log_error("Failed to attach bus to event loop: %s", strerror(-r));
654 int main(int argc, char *argv[]) {
655 Context context = {};
657 _cleanup_event_unref_ sd_event *event = NULL;
658 _cleanup_bus_unref_ sd_bus *bus = NULL;
661 log_set_target(LOG_TARGET_AUTO);
662 log_parse_environment();
669 log_error("This program takes no arguments.");
675 log_warning("Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!");
678 log_error("This program takes no arguments.");
683 r = sd_event_default(&event);
685 log_error("Failed to allocate event loop: %s", strerror(-r));
689 sd_event_set_watchdog(event, true);
691 r = connect_bus(&context, event, &bus);
695 r = context_read_data(&context);
697 log_error("Failed to read hostname and machine information: %s", strerror(-r));
701 r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC, NULL, NULL);
703 log_error("Failed to run event loop: %s", strerror(-r));
708 context_free(&context, bus);
710 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;