int
main (int argc, char *argv[])
{
GDBusConnection *connection;
GError *error = NULL;
nm_g_type_init ();
connection = g_dbus_connection_new_for_address_sync ("unix:path=" NMRUNDIR "/private-dhcp",
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT,
NULL, NULL, &error);
if (!connection) {
g_dbus_error_strip_remote_error (error);
g_printerr ("Error: could not connect to NetworkManager D-Bus socket: %s\n",
error->message);
g_error_free (error);
fatal_error ();
}
if (!g_dbus_connection_emit_signal (connection,
NULL,
"/",
NM_DHCP_CLIENT_DBUS_IFACE,
"Event",
build_signal_parameters (),
&error)) {
g_dbus_error_strip_remote_error (error);
g_printerr ("Error: Could not send DHCP Event signal: %s\n", error->message);
g_error_free (error);
fatal_error ();
}
if (!g_dbus_connection_flush_sync (connection, NULL, &error)) {
g_dbus_error_strip_remote_error (error);
g_printerr ("Error: Could not flush D-Bus connection: %s\n", error->message);
g_error_free (error);
fatal_error ();
}
g_object_unref (connection);
return 0;
}
int
main (int argc, char *argv[])
{
gs_unref_object GDBusConnection *connection = NULL;
gs_free_error GError *error = NULL;
gs_unref_variant GVariant *parameters = NULL;
gs_unref_variant GVariant *result = NULL;
gboolean success = FALSE;
guint try_count = 0;
gint64 time_end;
nm_g_type_init ();
/* FIXME: g_dbus_connection_new_for_address_sync() tries to connect to the socket in
* non-blocking mode, which can easily fail with EAGAIN, causing the creation of the
* socket to fail with "Could not connect: Resource temporarily unavailable".
*
* We should instead create the GIOStream ourself and block on connecting to
* the socket. */
connection = g_dbus_connection_new_for_address_sync ("unix:path=" NMRUNDIR "/private-dhcp",
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT,
NULL, NULL, &error);
if (!connection) {
g_dbus_error_strip_remote_error (error);
_LOGE ("could not connect to NetworkManager D-Bus socket: %s",
error->message);
goto out;
}
parameters = build_signal_parameters ();
time_end = g_get_monotonic_time () + (200 * 1000L); /* retry for at most 200 milliseconds */
do_notify:
try_count++;
result = g_dbus_connection_call_sync (connection,
NULL,
NM_DHCP_HELPER_SERVER_OBJECT_PATH,
NM_DHCP_HELPER_SERVER_INTERFACE_NAME,
NM_DHCP_HELPER_SERVER_METHOD_NOTIFY,
parameters,
NULL,
G_DBUS_CALL_FLAGS_NONE,
1000,
NULL,
&error);
if (!result) {
gs_free char *s_err = NULL;
s_err = g_dbus_error_get_remote_error (error);
if (NM_IN_STRSET (s_err, "org.freedesktop.DBus.Error.UnknownMethod")) {
gint64 remaining_time = time_end - g_get_monotonic_time ();
/* I am not sure that a race can actually happen, as we register the object
* on the server side during GDBusServer:new-connection signal.
*
* However, there was also a race for subscribing to an event, so let's just
* do some retry. */
if (remaining_time > 0) {
_LOGi ("failure to call notify: %s (retry %u)", error->message, try_count);
g_usleep (NM_MIN (NM_CLAMP ((gint64) (100L * (1L << try_count)), 5000, 25000), remaining_time));
g_clear_error (&error);
goto do_notify;
}
}
_LOGW ("failure to call notify: %s (try signal via Event)", error->message);
g_clear_error (&error);
/* for backward compatibilty, try to emit the signal. There is no stable
* API between the dhcp-helper and NetworkManager. However, while upgrading
* the NetworkManager package, a newer helper might want to notify an
* older server, which still uses the "Event". */
if (!g_dbus_connection_emit_signal (connection,
NULL,
"/",
NM_DHCP_CLIENT_DBUS_IFACE,
"Event",
parameters,
&error)) {
g_dbus_error_strip_remote_error (error);
_LOGE ("could not send DHCP Event signal: %s", error->message);
goto out;
}
/* We were able to send the asynchronous Event. Consider that a success. */
success = TRUE;
} else
success = TRUE;
if (!g_dbus_connection_flush_sync (connection, NULL, &error)) {
g_dbus_error_strip_remote_error (error);
_LOGE ("could not flush D-Bus connection: %s", error->message);
success = FALSE;
goto out;
}
out:
if (!success)
kill_pid ();
return success ? EXIT_SUCCESS : EXIT_FAILURE;
}
