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diff --git a/contrib/librdns/util.h b/contrib/librdns/util.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 UTIL_H_
+#define UTIL_H_
+
+#include "dns_private.h"
+
+/**
+ * Make a universal socket
+ * @param credits host, ip or path to unix socket
+ * @param port port (used for network sockets)
+ * @param type of socket (SOCK_STREAM or SOCK_DGRAM)
+ */
+int
+rdns_make_client_socket (const char *credits,
+						 uint16_t port,
+						 int type,
+						 struct sockaddr **psockaddr,
+						 socklen_t *psocklen);
+
+/**
+ * Generate new random DNS id
+ * @return dns id
+ */
+uint16_t rdns_permutor_generate_id (void);
+
+
+/**
+ * Free IO channel
+ */
+void rdns_ioc_free (struct rdns_io_channel *ioc);
+
+/**
+ * Creates a new IO channel
+ */
+struct rdns_io_channel * rdns_ioc_new (struct rdns_server *srv,
+									   struct rdns_resolver *resolver,
+									   bool is_tcp);
+
+/**
+ * Resets inactive/errored TCP chain as recommended by RFC
+ * @param ioc
+ */
+void rdns_ioc_tcp_reset (struct rdns_io_channel *ioc);
+
+/**
+ * Connect TCP IO channel to a server
+ * @param ioc
+ */
+bool rdns_ioc_tcp_connect (struct rdns_io_channel *ioc);
+
+/**
+ * Free request
+ * @param req
+ */
+void rdns_request_free (struct rdns_request *req);
+
+/**
+ * Removes request from a channel's hash (e.g. if needed to migrate to another channel)
+ * @param req
+ */
+void rdns_request_remove_from_hash (struct rdns_request *req);
+
+/**
+ * Creates a new reply
+ * @param req
+ * @param rcode
+ * @return
+ */
+struct rdns_reply * rdns_make_reply (struct rdns_request *req, enum dns_rcode rcode);
+/**
+ * Free reply
+ * @param rep
+ */
+void rdns_reply_free (struct rdns_reply *rep);
+
+void rdns_request_unschedule (struct rdns_request *req, bool remove_from_hash);
+
+#endif /* UTIL_H_ */