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"
34 #include "event-util.h"
35 #include "selinux-util.h"
36 #include "hostname-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_hostname_config("/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();
160 if (VIRTUALIZATION_IS_VM(v
))
162 if (VIRTUALIZATION_IS_CONTAINER(v
))
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_message
*m
, void *userdata
, sd_bus_error
*error
) {
408 Context
*c
= userdata
;
417 r
= sd_bus_message_read(m
, "sb", &name
, &interactive
);
422 name
= c
->data
[PROP_STATIC_HOSTNAME
];
427 if (!hostname_is_valid(name
, false))
428 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid hostname '%s'", name
);
430 if (streq_ptr(name
, c
->data
[PROP_HOSTNAME
]))
431 return sd_bus_reply_method_return(m
, NULL
);
433 r
= bus_verify_polkit_async(
436 "org.freedesktop.hostname1.set-hostname",
445 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
451 free(c
->data
[PROP_HOSTNAME
]);
452 c
->data
[PROP_HOSTNAME
] = h
;
454 r
= context_update_kernel_hostname(c
);
456 log_error_errno(r
, "Failed to set host name: %m");
457 return sd_bus_error_set_errnof(error
, r
, "Failed to set hostname: %s", strerror(-r
));
460 log_info("Changed host name to '%s'", strna(c
->data
[PROP_HOSTNAME
]));
462 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m
), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "Hostname", NULL
);
464 return sd_bus_reply_method_return(m
, NULL
);
467 static int method_set_static_hostname(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
468 Context
*c
= userdata
;
476 r
= sd_bus_message_read(m
, "sb", &name
, &interactive
);
483 if (streq_ptr(name
, c
->data
[PROP_STATIC_HOSTNAME
]))
484 return sd_bus_reply_method_return(m
, NULL
);
486 r
= bus_verify_polkit_async(
489 "org.freedesktop.hostname1.set-static-hostname",
498 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
501 free(c
->data
[PROP_STATIC_HOSTNAME
]);
502 c
->data
[PROP_STATIC_HOSTNAME
] = NULL
;
506 if (!hostname_is_valid(name
, false))
507 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid static hostname '%s'", name
);
513 free(c
->data
[PROP_STATIC_HOSTNAME
]);
514 c
->data
[PROP_STATIC_HOSTNAME
] = h
;
517 r
= context_update_kernel_hostname(c
);
519 log_error_errno(r
, "Failed to set host name: %m");
520 return sd_bus_error_set_errnof(error
, r
, "Failed to set hostname: %s", strerror(-r
));
523 r
= context_write_data_static_hostname(c
);
525 log_error_errno(r
, "Failed to write static host name: %m");
526 return sd_bus_error_set_errnof(error
, r
, "Failed to set static hostname: %s", strerror(-r
));
529 log_info("Changed static host name to '%s'", strna(c
->data
[PROP_STATIC_HOSTNAME
]));
531 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m
), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "StaticHostname", NULL
);
533 return sd_bus_reply_method_return(m
, NULL
);
536 static int set_machine_info(Context
*c
, sd_bus_message
*m
, int prop
, sd_bus_message_handler_t cb
, sd_bus_error
*error
) {
544 r
= sd_bus_message_read(m
, "sb", &name
, &interactive
);
551 if (streq_ptr(name
, c
->data
[prop
]))
552 return sd_bus_reply_method_return(m
, NULL
);
554 /* Since the pretty hostname should always be changed at the
555 * same time as the static one, use the same policy action for
558 r
= bus_verify_polkit_async(
561 prop
== PROP_PRETTY_HOSTNAME
? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
570 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
574 c
->data
[prop
] = NULL
;
578 /* The icon name might ultimately be used as file
579 * name, so better be safe than sorry */
581 if (prop
== PROP_ICON_NAME
&& !filename_is_valid(name
))
582 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid icon name '%s'", name
);
583 if (prop
== PROP_PRETTY_HOSTNAME
&& string_has_cc(name
, NULL
))
584 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid pretty host name '%s'", name
);
585 if (prop
== PROP_CHASSIS
&& !valid_chassis(name
))
586 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid chassis '%s'", name
);
587 if (prop
== PROP_DEPLOYMENT
&& !valid_deployment(name
))
588 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid deployment '%s'", name
);
589 if (prop
== PROP_LOCATION
&& string_has_cc(name
, NULL
))
590 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid location '%s'", name
);
600 r
= context_write_data_machine_info(c
);
602 log_error_errno(r
, "Failed to write machine info: %m");
603 return sd_bus_error_set_errnof(error
, r
, "Failed to write machine info: %s", strerror(-r
));
606 log_info("Changed %s to '%s'",
607 prop
== PROP_PRETTY_HOSTNAME
? "pretty host name" :
608 prop
== PROP_DEPLOYMENT
? "deployment" :
609 prop
== PROP_LOCATION
? "location" :
610 prop
== PROP_CHASSIS
? "chassis" : "icon name", strna(c
->data
[prop
]));
612 (void) sd_bus_emit_properties_changed(
613 sd_bus_message_get_bus(m
),
614 "/org/freedesktop/hostname1",
615 "org.freedesktop.hostname1",
616 prop
== PROP_PRETTY_HOSTNAME
? "PrettyHostname" :
617 prop
== PROP_DEPLOYMENT
? "Deployment" :
618 prop
== PROP_LOCATION
? "Location" :
619 prop
== PROP_CHASSIS
? "Chassis" : "IconName" , NULL
);
621 return sd_bus_reply_method_return(m
, NULL
);
624 static int method_set_pretty_hostname(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
625 return set_machine_info(userdata
, m
, PROP_PRETTY_HOSTNAME
, method_set_pretty_hostname
, error
);
628 static int method_set_icon_name(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
629 return set_machine_info(userdata
, m
, PROP_ICON_NAME
, method_set_icon_name
, error
);
632 static int method_set_chassis(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
633 return set_machine_info(userdata
, m
, PROP_CHASSIS
, method_set_chassis
, error
);
636 static int method_set_deployment(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
637 return set_machine_info(userdata
, m
, PROP_DEPLOYMENT
, method_set_deployment
, error
);
640 static int method_set_location(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
641 return set_machine_info(userdata
, m
, PROP_LOCATION
, method_set_location
, error
);
644 static const sd_bus_vtable hostname_vtable
[] = {
645 SD_BUS_VTABLE_START(0),
646 SD_BUS_PROPERTY("Hostname", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_HOSTNAME
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
647 SD_BUS_PROPERTY("StaticHostname", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_STATIC_HOSTNAME
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
648 SD_BUS_PROPERTY("PrettyHostname", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_PRETTY_HOSTNAME
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
649 SD_BUS_PROPERTY("IconName", "s", property_get_icon_name
, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
650 SD_BUS_PROPERTY("Chassis", "s", property_get_chassis
, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
651 SD_BUS_PROPERTY("Deployment", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_DEPLOYMENT
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
652 SD_BUS_PROPERTY("Location", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_LOCATION
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
653 SD_BUS_PROPERTY("KernelName", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_KERNEL_NAME
, SD_BUS_VTABLE_PROPERTY_CONST
),
654 SD_BUS_PROPERTY("KernelRelease", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_KERNEL_RELEASE
, SD_BUS_VTABLE_PROPERTY_CONST
),
655 SD_BUS_PROPERTY("KernelVersion", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_KERNEL_VERSION
, SD_BUS_VTABLE_PROPERTY_CONST
),
656 SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_OS_PRETTY_NAME
, SD_BUS_VTABLE_PROPERTY_CONST
),
657 SD_BUS_PROPERTY("OperatingSystemCPEName", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_OS_CPE_NAME
, SD_BUS_VTABLE_PROPERTY_CONST
),
658 SD_BUS_METHOD("SetHostname", "sb", NULL
, method_set_hostname
, SD_BUS_VTABLE_UNPRIVILEGED
),
659 SD_BUS_METHOD("SetStaticHostname", "sb", NULL
, method_set_static_hostname
, SD_BUS_VTABLE_UNPRIVILEGED
),
660 SD_BUS_METHOD("SetPrettyHostname", "sb", NULL
, method_set_pretty_hostname
, SD_BUS_VTABLE_UNPRIVILEGED
),
661 SD_BUS_METHOD("SetIconName", "sb", NULL
, method_set_icon_name
, SD_BUS_VTABLE_UNPRIVILEGED
),
662 SD_BUS_METHOD("SetChassis", "sb", NULL
, method_set_chassis
, SD_BUS_VTABLE_UNPRIVILEGED
),
663 SD_BUS_METHOD("SetDeployment", "sb", NULL
, method_set_deployment
, SD_BUS_VTABLE_UNPRIVILEGED
),
664 SD_BUS_METHOD("SetLocation", "sb", NULL
, method_set_location
, SD_BUS_VTABLE_UNPRIVILEGED
),
668 static int connect_bus(Context
*c
, sd_event
*event
, sd_bus
**_bus
) {
669 _cleanup_bus_flush_close_unref_ sd_bus
*bus
= NULL
;
676 r
= sd_bus_default_system(&bus
);
678 return log_error_errno(r
, "Failed to get system bus connection: %m");
680 r
= sd_bus_add_object_vtable(bus
, NULL
, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", hostname_vtable
, c
);
682 return log_error_errno(r
, "Failed to register object: %m");
684 r
= sd_bus_request_name(bus
, "org.freedesktop.hostname1", 0);
686 return log_error_errno(r
, "Failed to register name: %m");
688 r
= sd_bus_attach_event(bus
, event
, 0);
690 return log_error_errno(r
, "Failed to attach bus to event loop: %m");
698 int main(int argc
, char *argv
[]) {
699 Context context
= {};
700 _cleanup_event_unref_ sd_event
*event
= NULL
;
701 _cleanup_bus_flush_close_unref_ sd_bus
*bus
= NULL
;
704 log_set_target(LOG_TARGET_AUTO
);
705 log_parse_environment();
709 mac_selinux_init("/etc");
712 log_error("This program takes no arguments.");
718 log_error("This program takes no arguments.");
723 r
= sd_event_default(&event
);
725 log_error_errno(r
, "Failed to allocate event loop: %m");
729 sd_event_set_watchdog(event
, true);
731 r
= connect_bus(&context
, event
, &bus
);
735 r
= context_read_data(&context
);
737 log_error_errno(r
, "Failed to read hostname and machine information: %m");
741 r
= bus_event_loop_with_idle(event
, bus
, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC
, NULL
, NULL
);
743 log_error_errno(r
, "Failed to run event loop: %m");
748 context_free(&context
);
750 return r
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
;