#include <dbus/dbus.h>

#include <errno.h>

#include <string.h>

#include <unistd.h>

#include "util.h"

#include "strv.h"

#include "dbus-common.h"

#include "polkit.h"

#define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n"

#define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n"

#define INTROSPECTION \

DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \

"<node>\n" \

" <interface name=\"org.freedesktop.timedate1\">\n" \

" <property name=\"Timezone\" type=\"s\" access=\"read\"/>\n" \

" <property name=\"LocalRTC\" type=\"b\" access=\"read\"/>\n" \

" <method name=\"SetTime\">\n" \

" <arg name=\"usec_utc\" type=\"x\" direction=\"in\"/>\n" \

" <arg name=\"relative\" type=\"b\" direction=\"in\"/>\n" \

" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \

" </method>\n" \

" <method name=\"SetTimezone\">\n" \

" <arg name=\"timezone\" type=\"s\" direction=\"in\"/>\n" \

" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \

" </method>\n" \

" <method name=\"SetLocalRTC\">\n" \

" <arg name=\"local_rtc\" type=\"b\" direction=\"in\"/>\n" \

" <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \

" </method>\n" \

" </interface>\n" \

BUS_PROPERTIES_INTERFACE \

BUS_INTROSPECTABLE_INTERFACE \

BUS_PEER_INTERFACE \

"</node>\n"

#define INTERFACES_LIST \

BUS_GENERIC_INTERFACES_LIST \

"org.freedesktop.locale1\0"

static char *zone = NULL;

static bool local_rtc = false;

static void free_data(void) {

free(zone);

zone = NULL;

local_rtc = false;

}

static bool valid_timezone(const char *name) {

const char *p;

char *t;

bool slash = false;

int r;

struct stat st;

assert(name);

if (*name == '/' || *name == 0)

return false;

for (p = name; *p; p++) {

if (!(*p >= '0' && *p <= '9') &&

!(*p >= 'a' && *p <= 'z') &&

!(*p >= 'A' && *p <= 'Z') &&

!(*p == '-' || *p == '_' || *p == '+' || *p == '/'))

return false;

if (*p == '/') {

if (slash)

return false;

slash = true;

} else

slash = false;

}

if (slash)

return false;

t = strappend("/usr/share/zoneinfo/", name);

if (!t)

return false;

r = stat(t, &st);

free(t);

if (r < 0)

return false;

if (!S_ISREG(st.st_mode))

return false;

return true;

}

static void verify_timezone(void) {

char *p, *a = NULL, *b = NULL;

size_t l, q;

int j, k;

if (!zone)

return;

p = strappend("/usr/share/zoneinfo/", zone);

if (!p) {

log_error("Out of memory");

return;

}

j = read_full_file("/etc/localtime", &a, &l);

k = read_full_file(p, &b, &q);

free(p);

if (j < 0 || k < 0 || l != q || memcmp(a, b, l)) {

log_warning("/etc/localtime and /etc/timezone out of sync.");

free(zone);

zone = NULL;

}

free(a);

free(b);

}

static int read_data(void) {

int r;

FILE *f;

free_data();

r = read_one_line_file("/etc/timezone", &zone);

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

return r;

verify_timezone();

f = fopen("/etc/adjtime", "r");

if (f) {

char line[LINE_MAX];

bool b;

b = fgets(line, sizeof(line), f) &&

fgets(line, sizeof(line), f) &&

fgets(line, sizeof(line), f);

fclose(f);

if (!b)

return -EIO;

truncate_nl(line);

local_rtc = streq(line, "LOCAL");

} else if (errno != ENOENT)

return -errno;

return 0;

}

static int write_data_timezone(void) {

int r = 0;

char *p;

if (!zone) {

if (unlink("/etc/timezone") < 0 && errno != ENOENT)

r = -errno;

if (unlink("/etc/localtime") < 0 && errno != ENOENT)

r = -errno;

return r;

}

p = strappend("/usr/share/zoneinfo/", zone);

if (!p) {

log_error("Out of memory");

return -ENOMEM;

}

r = symlink_or_copy_atomic(p, "/etc/localtime");

free(p);

if (r < 0)

return r;

r = write_one_line_file_atomic("/etc/timezone", zone);

if (r < 0)

return r;

return 0;

}

static int write_data_local_rtc(void) {

int r;

char *s, *w;

r = read_full_file("/etc/adjtime", &s, NULL);

if (r < 0) {

if (r != -ENOENT)

return r;

if (!local_rtc)

return 0;

w = strdup(NULL_ADJTIME_LOCAL);

if (!w)

return -ENOMEM;

} else {

char *p, *e;

size_t a, b;

p = strchr(s, '\n');

if (!p) {

free(s);

return -EIO;

}

p = strchr(p+1, '\n');

if (!p) {

free(s);

return -EIO;

}

p++;

e = strchr(p, '\n');

if (!p) {

free(s);

return -EIO;

}

a = p - s;

b = strlen(e);

w = new(char, a + (local_rtc ? 5 : 3) + b + 1);

if (!w) {

free(s);

return -ENOMEM;

}

*(char*) mempcpy(stpcpy(mempcpy(w, s, a), local_rtc ? "LOCAL" : "UTC"), e, b) = 0;

if (streq(w, NULL_ADJTIME_UTC)) {

free(w);

if (unlink("/etc/adjtime") < 0) {

if (errno != ENOENT)

return -errno;

}

return 0;

}

}

r = write_one_line_file_atomic("/etc/adjtime", w);

free(w);

return r;

}

static DBusHandlerResult timedate_message_handler(

DBusConnection *connection,

DBusMessage *message,

void *userdata) {

const BusProperty properties[] = {

{ "org.freedesktop.timedate1", "Timezone", bus_property_append_string, "s", zone },

{ "org.freedesktop.timedate1", "LocalRTC", bus_property_append_bool, "b", &local_rtc },

{ NULL, NULL, NULL, NULL, NULL }

};

DBusMessage *reply = NULL, *changed = NULL;

DBusError error;

int r;

assert(connection);

assert(message);

dbus_error_init(&error);

if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTimezone")) {

const char *z;

dbus_bool_t interactive;

if (!dbus_message_get_args(

message,

&error,

DBUS_TYPE_STRING, &z,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID))

return bus_send_error_reply(connection, message, &error, -EINVAL);

if (!valid_timezone(z))

return bus_send_error_reply(connection, message, NULL, -EINVAL);

if (!streq_ptr(z, zone)) {

char *t;

r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-timezone", interactive, &error);

if (r < 0)

return bus_send_error_reply(connection, message, &error, r);

t = strdup(z);

if (!t)

goto oom;

free(zone);

zone = t;

r = write_data_timezone();

if (r < 0) {

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

return bus_send_error_reply(connection, message, NULL, r);

}

log_info("Changed timezone to '%s'.", zone);

changed = bus_properties_changed_new(

"/org/freedesktop/timedate1",

"org.freedesktop.timedate1",

"Timezone\0");

if (!changed)

goto oom;

}

} else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetLocalRTC")) {

dbus_bool_t lrtc;

dbus_bool_t interactive;

if (!dbus_message_get_args(

message,

&error,

DBUS_TYPE_BOOLEAN, &lrtc,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID))

return bus_send_error_reply(connection, message, &error, -EINVAL);

if (lrtc != local_rtc) {

r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-local-rtc", interactive, &error);

if (r < 0)

return bus_send_error_reply(connection, message, &error, r);

local_rtc = lrtc;

r = write_data_local_rtc();

if (r < 0) {

log_error("Failed to set RTC to local/UTC: %s", strerror(-r));

return bus_send_error_reply(connection, message, NULL, r);

}

log_info("Changed local RTC setting to '%s'.", yes_no(local_rtc));

changed = bus_properties_changed_new(

"/org/freedesktop/timedate1",

"org.freedesktop.timedate1",

"LocalRTC\0");

if (!changed)

goto oom;

}

} else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTime")) {

int64_t utc;

dbus_bool_t relative;

dbus_bool_t interactive;

if (!dbus_message_get_args(

message,

&error,

DBUS_TYPE_INT64, &utc,

DBUS_TYPE_BOOLEAN, &relative,

DBUS_TYPE_BOOLEAN, &interactive,

DBUS_TYPE_INVALID))

return bus_send_error_reply(connection, message, &error, -EINVAL);

if (!relative && utc <= 0)

return bus_send_error_reply(connection, message, NULL, -EINVAL);

if (!relative || utc != 0) {

struct timespec ts;

r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-time", interactive, &error);

if (r < 0)

return bus_send_error_reply(connection, message, &error, r);

if (relative)

timespec_store(&ts, now(CLOCK_REALTIME) + utc);

else

timespec_store(&ts, utc);

if (clock_settime(CLOCK_REALTIME, &ts) < 0) {

log_error("Failed to set local time: %m");

return bus_send_error_reply(connection, message, NULL, -errno);

}

log_info("Changed local time to %s", ctime(&ts.tv_sec));

}

} else

return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);

if (!(reply = dbus_message_new_method_return(message)))

goto oom;

if (!dbus_connection_send(connection, reply, NULL))

goto oom;

dbus_message_unref(reply);

reply = NULL;

if (changed) {

if (!dbus_connection_send(connection, changed, NULL))

goto oom;

dbus_message_unref(changed);

}

return DBUS_HANDLER_RESULT_HANDLED;

oom:

if (reply)

dbus_message_unref(reply);

if (changed)

dbus_message_unref(changed);

dbus_error_free(&error);

return DBUS_HANDLER_RESULT_NEED_MEMORY;

}

static int connect_bus(DBusConnection **_bus) {

static const DBusObjectPathVTable timedate_vtable = {

.message_function = timedate_message_handler

};

DBusError error;

DBusConnection *bus = NULL;

int r;

assert(_bus);

dbus_error_init(&error);

bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error);

if (!bus) {

log_error("Failed to get system D-Bus connection: %s", error.message);

r = -ECONNREFUSED;

goto fail;

}

if (!dbus_connection_register_object_path(bus, "/org/freedesktop/timedate1", &timedate_vtable, NULL)) {

log_error("Not enough memory");

r = -ENOMEM;

goto fail;

}

if (dbus_bus_request_name(bus, "org.freedesktop.timedate1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error) < 0) {

log_error("Failed to register name on bus: %s", error.message);

r = -EEXIST;

goto fail;

}

if (_bus)

*_bus = bus;

return 0;

fail:

dbus_connection_close(bus);

dbus_connection_unref(bus);

dbus_error_free(&error);

return r;

}

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

int r;

DBusConnection *bus = NULL;

log_set_target(LOG_TARGET_AUTO);

log_parse_environment();

log_open();

if (argc != 1) {

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

r = -EINVAL;

goto finish;

}

umask(0022);

r = read_data();

if (r < 0) {

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

goto finish;

}

r = connect_bus(&bus);

if (r < 0)

goto finish;

while (dbus_connection_read_write_dispatch(bus, -1))

;

r = 0;

finish:

free_data();

if (bus) {

dbus_connection_flush(bus);

dbus_connection_close(bus);

dbus_connection_unref(bus);

}

return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

}