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; }