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diff --git a/src/utils/common/params.h b/src/utils/common/params.h
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+/* Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+/*!
+ * \file
+ *
+ * \brief Common utils parameters processing.
+ *
+ * \addtogroup knot_utils
+ * @{
+ */
+
+#pragma once
+
+#include <limits.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+#include "libknot/libknot.h"
+#include "contrib/ucw/lists.h"
+
+#define DEFAULT_IPV4_NAME "127.0.0.1"
+#define DEFAULT_IPV6_NAME "::1"
+#define DEFAULT_DNS_PORT "53"
+#define DEFAULT_DNS_TLS_PORT "853"
+#define DEFAULT_UDP_SIZE 512
+#define DEFAULT_EDNS_SIZE 4096
+#define MAX_PACKET_SIZE 65535
+
+#define SEP_CHARS "\n\t "
+
+/*! \brief Variants of IP protocol. */
+typedef enum {
+ IP_ALL,
+ IP_4,
+ IP_6
+} ip_t;
+
+/*! \brief Variants of transport protocol. */
+typedef enum {
+ PROTO_ALL,
+ PROTO_TCP,
+ PROTO_UDP
+} protocol_t;
+
+/*! \brief Variants of output type. */
+typedef enum {
+ /*!< Verbose output (same for host and dig). */
+ FORMAT_FULL,
+ /*!< Short dig output. */
+ FORMAT_DIG,
+ /*!< Brief host output. */
+ FORMAT_HOST,
+ /*!< Brief nsupdate output. */
+ FORMAT_NSUPDATE
+} format_t;
+
+/*! \brief Text output settings. */
+typedef struct {
+ /*!< Output format. */
+ format_t format;
+
+ /*!< Style of rrset dump. */
+ knot_dump_style_t style;
+
+ /*!< Show query packet. */
+ bool show_query;
+ /*!< Show header info. */
+ bool show_header;
+ /*!< Show section name. */
+ bool show_section;
+ /*!< Show EDNS pseudosection. */
+ bool show_edns;
+ /*!< Show QUERY/ZONE section. */
+ bool show_question;
+ /*!< Show ANSWER/PREREQ section. */
+ bool show_answer;
+ /*!< Show UPDATE/AUTHORITY section. */
+ bool show_authority;
+ /*!< Show ADDITIONAL section. */
+ bool show_additional;
+ /*!< Show TSIG pseudosection. */
+ bool show_tsig;
+ /*!< Show footer info. */
+ bool show_footer;
+
+ /*!< KHOST - Hide CNAME record in answer (duplicity reduction). */
+ bool hide_cname;
+} style_t;
+
+/*! \brief Parameter handler. */
+typedef int (*param_handle_f)(const char *arg, void *params);
+
+/*! \brief Parameter argument type. */
+typedef enum {
+ ARG_NONE,
+ ARG_REQUIRED,
+ ARG_OPTIONAL
+} arg_t;
+
+/*! \brief Parameter specification. */
+typedef struct {
+ const char *name;
+ arg_t arg;
+ param_handle_f handler;
+} param_t;
+
+inline static void print_version(const char *program_name)
+{
+ printf("%s (Knot DNS), version %s\n", program_name, PACKAGE_VERSION);
+}
+
+/*!
+ * \brief Transforms localized IDN string to ASCII punycode.
+ *
+ * \param idn_name IDN name to transform.
+ *
+ * \retval NULL if transformation fails.
+ * \retval string if ok.
+ */
+char *name_from_idn(const char *idn_name);
+
+/*!
+ * \brief Transforms ASCII punycode to localized IDN string.
+ *
+ * If an error occurs or IDN support is missing, this function does nothing.
+ *
+ * \param name ASCII name to transform and replace with IDN name.
+ */
+void name_to_idn(char **name);
+
+/*!
+ * \brief Find the best parameter match in table based on prefix equality.
+ *
+ * \param str Parameter name to look up.
+ * \param str_len Parameter name length.
+ * \param tbl Parameter table.
+ * \param unique Indication if output is unique result.
+ *
+ * \retval >=0 looked up parameter position in \a tbl.
+ * \retval err if error.
+ */
+int best_param(const char *str, const size_t str_len, const param_t *tbl,
+ bool *unique);
+
+char *get_reverse_name(const char *name);
+
+char *get_fqd_name(const char *name);
+
+int params_parse_class(const char *value, uint16_t *rclass);
+
+int params_parse_type(const char *value, uint16_t *rtype, int64_t *serial,
+ bool *notify);
+
+int params_parse_server(const char *value, list_t *servers, const char *def_port);
+
+int params_parse_wait(const char *value, int32_t *dst);
+
+/*! @} */