from telnet_server.c:933
static const struct service_driver telnet_service_driver = {
.name = "telnet",
.new_connection_during_keep_alive_handler = NULL,
.new_connection_handler = telnet_new_connection,
.input_handler = telnet_input,
.connection_closed_handler = telnet_connection_closed,
.keep_client_alive_handler = NULL,
};