--- /dev/null
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
+ * Copyright (C) 2008 Steven Barth <steven@midlink.org>
+ */
+
+#ifndef _HELPER_H__
+#define _HELPER_H__
+
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+
+int char2ipv4(char *c, char *ip);
+void ipv42char(char *b, char *ip);
+void mac2char(char *b, char *mac);
+void add_table_entry(lua_State *L, const char *k, const char *v);
+void add_table_entry_int(lua_State *L, const char *k, int v);
+
+#endif