int bus_open_system_systemd(sd_bus **_bus) {
_cleanup_bus_unref_ sd_bus *bus = NULL;
int r;
assert(_bus);
if (geteuid() != 0)
return sd_bus_open_system(_bus);
/* If we are root, then let's talk directly to the system
* instance, instead of going via the bus */
r = sd_bus_new(&bus);
if (r < 0)
return r;
r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
if (r < 0)
return r;
r = sd_bus_start(bus);
if (r < 0)
return r;
r = bus_check_peercred(bus);
if (r < 0)
return r;
*_bus = bus;
bus = NULL;
return 0;
}
int bus_open_user_systemd(sd_bus **_bus) {
_cleanup_bus_unref_ sd_bus *bus = NULL;
_cleanup_free_ char *ee = NULL;
const char *e;
int r;
/* Try via kdbus first, and then directly */
assert(_bus);
#ifdef ENABLE_KDBUS
r = sd_bus_new(&bus);
if (r < 0)
return r;
if (asprintf(&bus->address, KERNEL_USER_BUS_FMT, getuid()) < 0)
return -ENOMEM;
bus->bus_client = true;
r = sd_bus_start(bus);
if (r >= 0) {
*_bus = bus;
bus = NULL;
return 0;
}
bus = sd_bus_unref(bus);
#endif
e = secure_getenv("XDG_RUNTIME_DIR");
if (!e)
return sd_bus_open_user(_bus);
ee = bus_address_escape(e);
if (!ee)
return -ENOMEM;
r = sd_bus_new(&bus);
if (r < 0)
return r;
bus->address = strjoin("unix:path=", ee, "/systemd/private", NULL);
if (!bus->address)
return -ENOMEM;
r = sd_bus_start(bus);
if (r < 0)
return sd_bus_open_user(_bus);
r = bus_check_peercred(bus);
if (r < 0)
return r;
*_bus = bus;
bus = NULL;
return 0;
}
int bus_open_system_systemd(sd_bus **_bus) {
_cleanup_bus_unref_ sd_bus *bus = NULL;
int r;
assert(_bus);
if (geteuid() != 0)
return sd_bus_open_system(_bus);
/* If we are root and kdbus is not available, then let's talk
* directly to the system instance, instead of going via the
* bus */
#ifdef ENABLE_KDBUS
r = sd_bus_new(&bus);
if (r < 0)
return r;
r = sd_bus_set_address(bus, KERNEL_SYSTEM_BUS_PATH);
if (r < 0)
return r;
bus->bus_client = true;
r = sd_bus_start(bus);
if (r >= 0) {
*_bus = bus;
bus = NULL;
return 0;
}
bus = sd_bus_unref(bus);
#endif
r = sd_bus_new(&bus);
if (r < 0)
return r;
r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
if (r < 0)
return r;
r = sd_bus_start(bus);
if (r < 0)
return sd_bus_open_system(_bus);
r = bus_check_peercred(bus);
if (r < 0)
return r;
*_bus = bus;
bus = NULL;
return 0;
}
int main(int argc, char *argv[]) {
DBusError error;
DBusConnection *bus = NULL;
DBusMessage *m = NULL;
int r = EXIT_FAILURE;
dbus_error_init(&error);
if (argc != 2) {
log_error("Incorrect number of arguments.");
goto finish;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
/* We send this event to the private D-Bus socket and then the
* system instance will forward this to the system bus. We do
* this to avoid an activation loop when we start dbus when we
* are called when the dbus service is shut down. */
if (!(bus = dbus_connection_open_private("unix:path=/run/systemd/private", &error))) {
#ifndef LEGACY
dbus_error_free(&error);
/* Retry with the pre v21 socket name, to ease upgrades */
if (!(bus = dbus_connection_open_private("unix:abstract=/org/freedesktop/systemd1/private", &error))) {
#endif
log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
goto finish;
}
#ifndef LEGACY
}
#endif
if (bus_check_peercred(bus) < 0) {
log_error("Bus owner not root.");
goto finish;
}
if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1/agent", "org.freedesktop.systemd1.Agent", "Released"))) {
log_error("Could not allocate signal message.");
goto finish;
}
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &argv[1],
DBUS_TYPE_INVALID)) {
log_error("Could not attach group information to signal message.");
goto finish;
}
if (!dbus_connection_send(bus, m, NULL)) {
log_error("Failed to send signal message on private connection.");
goto finish;
}
r = EXIT_SUCCESS;
finish:
if (bus) {
dbus_connection_flush(bus);
dbus_connection_close(bus);
dbus_connection_unref(bus);
}
if (m)
dbus_message_unref(m);
dbus_error_free(&error);
return r;
}