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(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_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
))
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",
444 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
450 free(c
->data
[PROP_HOSTNAME
]);
451 c
->data
[PROP_HOSTNAME
] = h
;
453 r
= context_update_kernel_hostname(c
);
455 log_error_errno(r
, "Failed to set host name: %m");
456 return sd_bus_error_set_errnof(error
, r
, "Failed to set hostname: %s", strerror(-r
));
459 log_info("Changed host name to '%s'", strna(c
->data
[PROP_HOSTNAME
]));
461 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m
), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "Hostname", NULL
);
463 return sd_bus_reply_method_return(m
, NULL
);
466 static int method_set_static_hostname(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
467 Context
*c
= userdata
;
475 r
= sd_bus_message_read(m
, "sb", &name
, &interactive
);
482 if (streq_ptr(name
, c
->data
[PROP_STATIC_HOSTNAME
]))
483 return sd_bus_reply_method_return(m
, NULL
);
485 r
= bus_verify_polkit_async(
488 "org.freedesktop.hostname1.set-static-hostname",
496 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
499 free(c
->data
[PROP_STATIC_HOSTNAME
]);
500 c
->data
[PROP_STATIC_HOSTNAME
] = NULL
;
504 if (!hostname_is_valid(name
))
505 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid static hostname '%s'", name
);
511 free(c
->data
[PROP_STATIC_HOSTNAME
]);
512 c
->data
[PROP_STATIC_HOSTNAME
] = h
;
515 r
= context_update_kernel_hostname(c
);
517 log_error_errno(r
, "Failed to set host name: %m");
518 return sd_bus_error_set_errnof(error
, r
, "Failed to set hostname: %s", strerror(-r
));
521 r
= context_write_data_static_hostname(c
);
523 log_error_errno(r
, "Failed to write static host name: %m");
524 return sd_bus_error_set_errnof(error
, r
, "Failed to set static hostname: %s", strerror(-r
));
527 log_info("Changed static host name to '%s'", strna(c
->data
[PROP_STATIC_HOSTNAME
]));
529 (void) sd_bus_emit_properties_changed(sd_bus_message_get_bus(m
), "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "StaticHostname", NULL
);
531 return sd_bus_reply_method_return(m
, NULL
);
534 static int set_machine_info(Context
*c
, sd_bus_message
*m
, int prop
, sd_bus_message_handler_t cb
, sd_bus_error
*error
) {
542 r
= sd_bus_message_read(m
, "sb", &name
, &interactive
);
549 if (streq_ptr(name
, c
->data
[prop
]))
550 return sd_bus_reply_method_return(m
, NULL
);
552 /* Since the pretty hostname should always be changed at the
553 * same time as the static one, use the same policy action for
556 r
= bus_verify_polkit_async(
559 prop
== PROP_PRETTY_HOSTNAME
? "org.freedesktop.hostname1.set-static-hostname" : "org.freedesktop.hostname1.set-machine-info",
567 return 1; /* No authorization for now, but the async polkit stuff will call us again when it has it */
571 c
->data
[prop
] = NULL
;
575 /* The icon name might ultimately be used as file
576 * name, so better be safe than sorry */
578 if (prop
== PROP_ICON_NAME
&& !filename_is_valid(name
))
579 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid icon name '%s'", name
);
580 if (prop
== PROP_PRETTY_HOSTNAME
&& string_has_cc(name
, NULL
))
581 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid pretty host name '%s'", name
);
582 if (prop
== PROP_CHASSIS
&& !valid_chassis(name
))
583 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid chassis '%s'", name
);
584 if (prop
== PROP_DEPLOYMENT
&& !valid_deployment(name
))
585 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid deployment '%s'", name
);
586 if (prop
== PROP_LOCATION
&& string_has_cc(name
, NULL
))
587 return sd_bus_error_setf(error
, SD_BUS_ERROR_INVALID_ARGS
, "Invalid location '%s'", name
);
597 r
= context_write_data_machine_info(c
);
599 log_error_errno(r
, "Failed to write machine info: %m");
600 return sd_bus_error_set_errnof(error
, r
, "Failed to write machine info: %s", strerror(-r
));
603 log_info("Changed %s to '%s'",
604 prop
== PROP_PRETTY_HOSTNAME
? "pretty host name" :
605 prop
== PROP_DEPLOYMENT
? "deployment" :
606 prop
== PROP_LOCATION
? "location" :
607 prop
== PROP_CHASSIS
? "chassis" : "icon name", strna(c
->data
[prop
]));
609 (void) sd_bus_emit_properties_changed(
610 sd_bus_message_get_bus(m
),
611 "/org/freedesktop/hostname1",
612 "org.freedesktop.hostname1",
613 prop
== PROP_PRETTY_HOSTNAME
? "PrettyHostname" :
614 prop
== PROP_DEPLOYMENT
? "Deployment" :
615 prop
== PROP_LOCATION
? "Location" :
616 prop
== PROP_CHASSIS
? "Chassis" : "IconName" , NULL
);
618 return sd_bus_reply_method_return(m
, NULL
);
621 static int method_set_pretty_hostname(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
622 return set_machine_info(userdata
, m
, PROP_PRETTY_HOSTNAME
, method_set_pretty_hostname
, error
);
625 static int method_set_icon_name(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
626 return set_machine_info(userdata
, m
, PROP_ICON_NAME
, method_set_icon_name
, error
);
629 static int method_set_chassis(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
630 return set_machine_info(userdata
, m
, PROP_CHASSIS
, method_set_chassis
, error
);
633 static int method_set_deployment(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
634 return set_machine_info(userdata
, m
, PROP_DEPLOYMENT
, method_set_deployment
, error
);
637 static int method_set_location(sd_bus_message
*m
, void *userdata
, sd_bus_error
*error
) {
638 return set_machine_info(userdata
, m
, PROP_LOCATION
, method_set_location
, error
);
641 static const sd_bus_vtable hostname_vtable
[] = {
642 SD_BUS_VTABLE_START(0),
643 SD_BUS_PROPERTY("Hostname", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_HOSTNAME
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
644 SD_BUS_PROPERTY("StaticHostname", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_STATIC_HOSTNAME
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
645 SD_BUS_PROPERTY("PrettyHostname", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_PRETTY_HOSTNAME
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
646 SD_BUS_PROPERTY("IconName", "s", property_get_icon_name
, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
647 SD_BUS_PROPERTY("Chassis", "s", property_get_chassis
, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
648 SD_BUS_PROPERTY("Deployment", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_DEPLOYMENT
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
649 SD_BUS_PROPERTY("Location", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_LOCATION
, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE
),
650 SD_BUS_PROPERTY("KernelName", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_KERNEL_NAME
, SD_BUS_VTABLE_PROPERTY_CONST
),
651 SD_BUS_PROPERTY("KernelRelease", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_KERNEL_RELEASE
, SD_BUS_VTABLE_PROPERTY_CONST
),
652 SD_BUS_PROPERTY("KernelVersion", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_KERNEL_VERSION
, SD_BUS_VTABLE_PROPERTY_CONST
),
653 SD_BUS_PROPERTY("OperatingSystemPrettyName", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_OS_PRETTY_NAME
, SD_BUS_VTABLE_PROPERTY_CONST
),
654 SD_BUS_PROPERTY("OperatingSystemCPEName", "s", NULL
, offsetof(Context
, data
) + sizeof(char*) * PROP_OS_CPE_NAME
, SD_BUS_VTABLE_PROPERTY_CONST
),
655 SD_BUS_METHOD("SetHostname", "sb", NULL
, method_set_hostname
, SD_BUS_VTABLE_UNPRIVILEGED
),
656 SD_BUS_METHOD("SetStaticHostname", "sb", NULL
, method_set_static_hostname
, SD_BUS_VTABLE_UNPRIVILEGED
),
657 SD_BUS_METHOD("SetPrettyHostname", "sb", NULL
, method_set_pretty_hostname
, SD_BUS_VTABLE_UNPRIVILEGED
),
658 SD_BUS_METHOD("SetIconName", "sb", NULL
, method_set_icon_name
, SD_BUS_VTABLE_UNPRIVILEGED
),
659 SD_BUS_METHOD("SetChassis", "sb", NULL
, method_set_chassis
, SD_BUS_VTABLE_UNPRIVILEGED
),
660 SD_BUS_METHOD("SetDeployment", "sb", NULL
, method_set_deployment
, SD_BUS_VTABLE_UNPRIVILEGED
),
661 SD_BUS_METHOD("SetLocation", "sb", NULL
, method_set_location
, SD_BUS_VTABLE_UNPRIVILEGED
),
665 static int connect_bus(Context
*c
, sd_event
*event
, sd_bus
**_bus
) {
666 _cleanup_bus_flush_close_unref_ sd_bus
*bus
= NULL
;
673 r
= sd_bus_default_system(&bus
);
675 return log_error_errno(r
, "Failed to get system bus connection: %m");
677 r
= sd_bus_add_object_vtable(bus
, NULL
, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", hostname_vtable
, c
);
679 return log_error_errno(r
, "Failed to register object: %m");
681 r
= sd_bus_request_name(bus
, "org.freedesktop.hostname1", 0);
683 return log_error_errno(r
, "Failed to register name: %m");
685 r
= sd_bus_attach_event(bus
, event
, 0);
687 return log_error_errno(r
, "Failed to attach bus to event loop: %m");
695 int main(int argc
, char *argv
[]) {
696 Context context
= {};
697 _cleanup_event_unref_ sd_event
*event
= NULL
;
698 _cleanup_bus_flush_close_unref_ sd_bus
*bus
= NULL
;
701 log_set_target(LOG_TARGET_AUTO
);
702 log_parse_environment();
706 mac_selinux_init("/etc");
709 log_error("This program takes no arguments.");
715 log_error("This program takes no arguments.");
720 r
= sd_event_default(&event
);
722 log_error_errno(r
, "Failed to allocate event loop: %m");
726 sd_event_set_watchdog(event
, true);
728 r
= connect_bus(&context
, event
, &bus
);
732 r
= context_read_data(&context
);
734 log_error_errno(r
, "Failed to read hostname and machine information: %m");
738 r
= bus_event_loop_with_idle(event
, bus
, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC
, NULL
, NULL
);
740 log_error_errno(r
, "Failed to run event loop: %m");
745 context_free(&context
);
747 return r
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
;