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diff --git a/contrib/librdns/punycode.h b/contrib/librdns/punycode.h
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+/* Copyright (c) 2014, Vsevolod Stakhov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *       * Redistributions of source code must retain the above copyright
+ *         notice, this list of conditions and the following disclaimer.
+ *       * Redistributions in binary form must reproduce the above copyright
+ *         notice, this list of conditions and the following disclaimer in the
+ *         documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef PUNYCODE_H_
+#define PUNYCODE_H_
+
+#include <stdbool.h>
+#include <stdint.h>
+
+/**
+ * Convert an UCS4 string to a puny-coded DNS label string suitable
+ * when combined with delimiters and other labels for DNS lookup.
+ *
+ * @param in an UCS4 string to convert
+ * @param in_len the length of in.
+ * @param out the resulting puny-coded string. The string is not NULL
+ * terminated.
+ * @param out_len before processing out_len should be the length of
+ * the out variable, after processing it will be the length of the out
+ * string.
+ *
+ * @return returns 0 on success, an wind error code otherwise
+ */
+bool rdns_punycode_label_toascii (const uint32_t *in, size_t in_len, char *out, size_t *out_len);
+/**
+ * Convert an UTF-8 string to an UCS4 string.
+ *
+ * @param in an UTF-8 string to convert.
+ * @param out the resulting UCS4 string
+ * @param out_len before processing out_len should be the length of
+ * the out variable, after processing it will be the length of the out
+ * string.
+ *
+ * @return returns 0 on success, an -1 otherwise
+ * @ingroup wind
+ */
+
+int rdns_utf8_to_ucs4 (const char *in, size_t in_len, uint32_t **out, size_t *out_len);
+
+#endif /* PUNYCODE_H_ */