#include <errno.h>

#include <string.h>

#include <unistd.h>

#include <dlfcn.h>

#include "util.h"

#include "strv.h"

#include "def.h"

#include "virt.h"

#include "env-util.h"

#include "fileio-label.h"

#include "label.h"

#include "bus-util.h"

#include "event-util.h"

enum {

PROP_HOSTNAME,

PROP_STATIC_HOSTNAME,

PROP_PRETTY_HOSTNAME,

PROP_ICON_NAME,

PROP_CHASSIS,

_PROP_MAX

};

typedef struct Context {

char *data[_PROP_MAX];

Hashmap *polkit_registry;

} Context;

static void context_reset(Context *c) {

int p;

assert(c);

for (p = 0; p < _PROP_MAX; p++) {

free(c->data[p]);

c->data[p] = NULL;

}

}

static void context_free(Context *c, sd_bus *bus) {

assert(c);

context_reset(c);

bus_verify_polkit_async_registry_free(bus, c->polkit_registry);

}

static int context_read_data(Context *c) {

int r;

assert(c);

context_reset(c);

c->data[PROP_HOSTNAME] = gethostname_malloc();

if (!c->data[PROP_HOSTNAME])

return -ENOMEM;

r = read_one_line_file("/etc/hostname", &c->data[PROP_STATIC_HOSTNAME]);

if (r < 0 && r != -ENOENT)

return r;

r = parse_env_file("/etc/machine-info", NEWLINE,

"PRETTY_HOSTNAME", &c->data[PROP_PRETTY_HOSTNAME],

"ICON_NAME", &c->data[PROP_ICON_NAME],

"CHASSIS", &c->data[PROP_CHASSIS],

NULL);

if (r < 0 && r != -ENOENT)

return r;

return 0;

}

static bool check_nss(void) {

void *dl;

dl = dlopen("libnss_myhostname.so.2", RTLD_LAZY);

if (dl) {

dlclose(dl);

return true;

}

return false;

}

static bool valid_chassis(const char *chassis) {

assert(chassis);

return nulstr_contains(

"vm\0"

"container\0"

"desktop\0"

"laptop\0"

"server\0"

"tablet\0"

"handset\0",

chassis);

}

static const char* fallback_chassis(void) {

int r;

char *type;

unsigned t;

Virtualization v;

v = detect_virtualization(NULL);

if (v == VIRTUALIZATION_VM)

return "vm";

if (v == VIRTUALIZATION_CONTAINER)

return "container";

r = read_one_line_file("/sys/firmware/acpi/pm_profile", &type);

if (r < 0)

goto try_dmi;

r = safe_atou(type, &t);

free(type);

if (r < 0)

goto try_dmi;

/* We only list the really obvious cases here as the ACPI data

switch(t) {

case 1:

case 3:

case 6:

return "desktop";

case 2:

return "laptop";

case 4:

case 5:

case 7:

return "server";

case 8:

return "tablet";

}

try_dmi:

r = read_one_line_file("/sys/class/dmi/id/chassis_type", &type);

if (r < 0)

return NULL;

r = safe_atou(type, &t);

free(type);

if (r < 0)

return NULL;

/* We only list the really obvious cases here. The DMI data is

switch (t) {

case 0x3:

case 0x4:

case 0x6:

case 0x7:

return "desktop";

case 0x8:

case 0x9:

case 0xA:

case 0xE:

return "laptop";

case 0xB:

return "handset";

case 0x11:

case 0x1C:

return "server";

}

return NULL;

}

static char* context_fallback_icon_name(Context *c) {

const char *chassis;

assert(c);

if (!isempty(c->data[PROP_CHASSIS]))

return strappend("computer-", c->data[PROP_CHASSIS]);

chassis = fallback_chassis();

if (chassis)

return strappend("computer-", chassis);

return strdup("computer");

}

static int context_write_data_hostname(Context *c) {

const char *hn;

assert(c);

if (isempty(c->data[PROP_HOSTNAME]))

hn = "localhost";

else

hn = c->data[PROP_HOSTNAME];

if (sethostname(hn, strlen(hn)) < 0)

return -errno;

return 0;

}

static int context_write_data_static_hostname(Context *c) {

assert(c);

if (isempty(c->data[PROP_STATIC_HOSTNAME])) {

if (unlink("/etc/hostname") < 0)

return errno == ENOENT ? 0 : -errno;

return 0;

}

return write_string_file_atomic_label("/etc/hostname", c->data[PROP_STATIC_HOSTNAME]);

}

static int context_write_data_other(Context *c) {

static const char * const name[_PROP_MAX] = {

[PROP_PRETTY_HOSTNAME] = "PRETTY_HOSTNAME",

[PROP_ICON_NAME] = "ICON_NAME",

[PROP_CHASSIS] = "CHASSIS"

};

_cleanup_strv_free_ char **l = NULL;

int r, p;

assert(c);

r = load_env_file("/etc/machine-info", NULL, &l);

if (r < 0 && r != -ENOENT)

return r;

for (p = 2; p < _PROP_MAX; p++) {

char *t, **u;

assert(name[p]);

if (isempty(c->data[p])) {

strv_env_unset(l, name[p]);

continue;

}

if (asprintf(&t, "%s=%s", name[p], strempty(c->data[p])) < 0)

return -ENOMEM;

u = strv_env_set(l, t);

free(t);

if (!u)

return -ENOMEM;

strv_free(l);

l = u;

}

if (strv_isempty(l)) {

if (unlink("/etc/machine-info") < 0)

return errno == ENOENT ? 0 : -errno;

return 0;

}

return write_env_file_label("/etc/machine-info", l);

}

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;

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) {

Context *c = userdata;

const char *name;

if (isempty(c->data[PROP_CHASSIS]))

name = fallback_chassis();

else

name = c->data[PROP_CHASSIS];

return sd_bus_message_append(reply, "s", name);

}

static int method_set_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {

Context *c = userdata;

const char *name;

int interactive;

char *h;

int r;

r = sd_bus_message_read(m, "sb", &name, &interactive);

if (r < 0)

return r;

if (isempty(name))

name = c->data[PROP_STATIC_HOSTNAME];

if (isempty(name))

name = "localhost";

if (!hostname_is_valid(name))

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid hostname '%s'", name);

if (streq_ptr(name, c->data[PROP_HOSTNAME]))

return sd_bus_reply_method_return(m, NULL);

r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.hostname1.set-hostname", interactive, error, method_set_hostname, c);

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 */

h = strdup(name);

if (!h)

return -ENOMEM;

free(c->data[PROP_HOSTNAME]);

c->data[PROP_HOSTNAME] = h;

r = context_write_data_hostname(c);

if (r < 0) {

log_error("Failed to set host name: %s", strerror(-r));

return sd_bus_error_set_errnof(error, r, "Failed to set hostname: %s", strerror(-r));

}

log_info("Changed host name to '%s'", strna(c->data[PROP_HOSTNAME]));

sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "Hostname", NULL);

return sd_bus_reply_method_return(m, NULL);

}

static int method_set_static_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {

Context *c = userdata;

const char *name;

int interactive;

int r;

r = sd_bus_message_read(m, "sb", &name, &interactive);

if (r < 0)

return r;

if (isempty(name))

name = NULL;

if (streq_ptr(name, c->data[PROP_STATIC_HOSTNAME]))

return sd_bus_reply_method_return(m, NULL);

r = bus_verify_polkit_async(bus, &c->polkit_registry, m, "org.freedesktop.hostname1.set-static-hostname", interactive, error, method_set_static_hostname, c);

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 */

if (isempty(name)) {

free(c->data[PROP_STATIC_HOSTNAME]);

c->data[PROP_STATIC_HOSTNAME] = NULL;

} else {

char *h;

if (!hostname_is_valid(name))

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid static hostname '%s'", name);

h = strdup(name);

if (!h)

return -ENOMEM;

free(c->data[PROP_STATIC_HOSTNAME]);

c->data[PROP_STATIC_HOSTNAME] = h;

}

r = context_write_data_static_hostname(c);

if (r < 0) {

log_error("Failed to write static host name: %s", strerror(-r));

return sd_bus_error_set_errnof(error, r, "Failed to set static hostname: %s", strerror(-r));

}

log_info("Changed static host name to '%s'", strna(c->data[PROP_STATIC_HOSTNAME]));

sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", "StaticHostname", NULL);

return sd_bus_reply_method_return(m, NULL);

}

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) {

int interactive;

const char *name;

int r;

assert(c);

assert(bus);

assert(m);

r = sd_bus_message_read(m, "sb", &name, &interactive);

if (r < 0)

return r;

if (isempty(name))

name = NULL;

if (streq_ptr(name, c->data[prop]))

return sd_bus_reply_method_return(m, NULL);

/* Since the pretty hostname should always be changed at the

r = bus_verify_polkit_async(bus, &c->polkit_registry, m, prop == PROP_PRETTY_HOSTNAME ?

"org.freedesktop.hostname1.set-static-hostname" :

"org.freedesktop.hostname1.set-machine-info", interactive, error, cb, c);

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 */

if (isempty(name)) {

free(c->data[prop]);

c->data[prop] = NULL;

} else {

char *h;

/* The icon name might ultimately be used as file

if (prop == PROP_ICON_NAME && !filename_is_safe(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) || chars_intersect(name, "\t")))

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid pretty host name '%s'", name);

if (prop == PROP_CHASSIS && !valid_chassis(name))

return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid chassis '%s'", name);

h = strdup(name);

if (!h)

return -ENOMEM;

free(c->data[prop]);

c->data[prop] = h;

}

r = context_write_data_other(c);

if (r < 0) {

log_error("Failed to write machine info: %s", strerror(-r));

return sd_bus_error_set_errnof(error, r, "Failed to write machine info: %s", strerror(-r));

}

log_info("Changed %s to '%s'",

prop == PROP_PRETTY_HOSTNAME ? "pretty host name" :

prop == PROP_CHASSIS ? "chassis" : "icon name", strna(c->data[prop]));

sd_bus_emit_properties_changed(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1",

prop == PROP_PRETTY_HOSTNAME ? "PrettyHostname" :

prop == PROP_CHASSIS ? "Chassis" : "IconName", NULL);

return sd_bus_reply_method_return(m, NULL);

}

static int method_set_pretty_hostname(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {

return set_machine_info(userdata, bus, m, PROP_PRETTY_HOSTNAME, method_set_pretty_hostname, error);

}

static int method_set_icon_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {

return set_machine_info(userdata, bus, m, PROP_ICON_NAME, method_set_icon_name, error);

}

static int method_set_chassis(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) {

return set_machine_info(userdata, bus, m, PROP_CHASSIS, method_set_chassis, error);

}

static const sd_bus_vtable hostname_vtable[] = {

SD_BUS_VTABLE_START(0),

SD_BUS_PROPERTY("Hostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_HOSTNAME, 0),

SD_BUS_PROPERTY("StaticHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_STATIC_HOSTNAME, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),

SD_BUS_PROPERTY("PrettyHostname", "s", NULL, offsetof(Context, data) + sizeof(char*) * PROP_PRETTY_HOSTNAME, 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_METHOD("SetHostname", "sb", NULL, method_set_hostname, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("SetStaticHostname", "sb", NULL, method_set_static_hostname, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("SetPrettyHostname", "sb", NULL, method_set_pretty_hostname, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("SetIconName", "sb", NULL, method_set_icon_name, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_METHOD("SetChassis", "sb", NULL, method_set_chassis, SD_BUS_VTABLE_UNPRIVILEGED),

SD_BUS_VTABLE_END,

};

static int connect_bus(Context *c, sd_event *event, sd_bus **_bus) {

_cleanup_bus_unref_ sd_bus *bus = NULL;

int r;

assert(c);

assert(event);

assert(_bus);

r = sd_bus_default_system(&bus);

if (r < 0) {

log_error("Failed to get system bus connection: %s", strerror(-r));

return r;

}

r = sd_bus_add_object_vtable(bus, "/org/freedesktop/hostname1", "org.freedesktop.hostname1", hostname_vtable, c);

if (r < 0) {

log_error("Failed to register object: %s", strerror(-r));

return r;

}

r = sd_bus_request_name(bus, "org.freedesktop.hostname1", SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_DO_NOT_QUEUE);

if (r < 0) {

log_error("Failed to register name: %s", strerror(-r));

return r;

}

r = sd_bus_attach_event(bus, event, 0);

if (r < 0) {

log_error("Failed to attach bus to event loop: %s", strerror(-r));

return r;

}

*_bus = bus;

bus = NULL;

return 0;

}

int main(int argc, char *argv[]) {

Context context = {};

_cleanup_event_unref_ sd_event *event = NULL;

_cleanup_bus_unref_ sd_bus *bus = NULL;

int r;

log_set_target(LOG_TARGET_AUTO);

log_parse_environment();

log_open();

umask(0022);

label_init("/etc");

if (argc != 1) {

log_error("This program takes no arguments.");

r = -EINVAL;

goto finish;

}

if (!check_nss())

log_warning("Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!");

if (argc != 1) {

log_error("This program takes no arguments.");

r = -EINVAL;

goto finish;

}

r = sd_event_default(&event);

if (r < 0) {

log_error("Failed to allocate event loop: %s", strerror(-r));

goto finish;

}

r = connect_bus(&context, event, &bus);

if (r < 0)

goto finish;

r = context_read_data(&context);

if (r < 0) {

log_error("Failed to read timezone data: %s", strerror(-r));

goto finish;

}

r = bus_event_loop_with_idle(event, bus, "org.freedesktop.hostname1", DEFAULT_EXIT_USEC);

if (r < 0) {

log_error("Failed to run event loop: %s", strerror(-r));

goto finish;

}

r = 0;

finish:

context_free(&context, bus);

return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

}