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diff --git a/src/utils/common/exec.h b/src/utils/common/exec.h
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+/* Copyright (C) 2022 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 <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <time.h>
+
+#include "utils/common/netio.h"
+#include "utils/common/params.h"
+#include "libknot/libknot.h"
+#include "contrib/json.h"
+
+/*!
+ * \brief Allocates empty packet and sets packet size and random id.
+ *
+ * \param max_size Maximal packet size.
+ *
+ * \retval packet if success.
+ * \retval NULL if error.
+ */
+knot_pkt_t *create_empty_packet(const uint16_t max_size);
+
+/*!
+ * \brief Prints information header for transfer.
+ *
+ * \param packet Parsed packet.
+ * \param style Style of the output.
+ */
+void print_header_xfr(const knot_pkt_t *packet, const style_t *style);
+
+/*!
+ * \brief Prints answer section for 1 transfer message.
+ *
+ * \param packet Response packet.
+ * \param style Style of the output.
+ */
+void print_data_xfr(const knot_pkt_t *packet, const style_t *style);
+
+/*!
+ * \brief Prints trailing statistics for transfer.
+ *
+ * \param total_len Total reply size (all messages).
+ * \param msg_count Number of messages.
+ * \param rr_count Total number of answer records.
+ * \param net Connection information.
+ * \param elapsed Total elapsed time.
+ * \param exec_time Time of the packet creation.
+ * \param style Style of the output.
+ */
+void print_footer_xfr(const size_t total_len,
+ const size_t msg_count,
+ const size_t rr_count,
+ const net_t *net,
+ const float elapsed,
+ const time_t exec_time,
+ const style_t *style);
+
+/*!
+ * \brief Prints initial JSON part of XFR output.
+ *
+ * \param query Query packet.
+ * \param exec_time Time of the packet creation.
+ * \param style Style of the output.
+ *
+ * \retval JSON witter if success.
+ * \retval NULL if error.
+ */
+jsonw_t *print_header_xfr_json(const knot_pkt_t *query,
+ const time_t exec_time,
+ const style_t *style);
+
+/*!
+ * \brief Prints one XFR reply packet in JSON.
+ *
+ * \param w JSON writter.
+ * \param reply Reply packet (possibly one of many).
+ * \param exec_time Time of the packet creation.
+ */
+void print_data_xfr_json(jsonw_t *w,
+ const knot_pkt_t *reply,
+ const time_t exec_time);
+
+/*!
+ * \brief Prints trailing JSON part of XFR output.
+ *
+ * \param w JSON writter.
+ * \param style Style of the output.
+ */
+void print_footer_xfr_json(jsonw_t **w,
+ const style_t *style);
+
+/*!
+ * \brief Prints one or query/reply pair of DNS packets in JSON format.
+ *
+ * \param query Query DNS packet.
+ * \param reply Reply DNS packet.
+ * \param net Connection information.
+ * \param exec_time Time of the packet creation.
+ * \param style Style of the output.
+ */
+void print_packets_json(const knot_pkt_t *query,
+ const knot_pkt_t *reply,
+ const net_t *net,
+ const time_t exec_time,
+ const style_t *style);
+
+/*!
+ * \brief Prints one DNS packet.
+ *
+ * \param packet DNS packet.
+ * \param net Connection information.
+ * \param size Original packet wire size.
+ * \param elapsed Total elapsed time.
+ * \param exec_time Time of the packet creation.
+ * \param incoming Indicates if the packet is input.
+ * \param style Style of the output.
+ */
+void print_packet(const knot_pkt_t *packet,
+ const net_t *net,
+ const size_t size,
+ const float elapsed,
+ const time_t exec_time,
+ const bool incoming,
+ const style_t *style);