1 files changed, 66 insertions, 0 deletions
diff --git a/src/knot/query/query.h b/src/knot/query/query.h
new file mode 100644
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--- /dev/null
+++ b/src/knot/query/query.h
@@ -0,0 +1,66 @@
+/*  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 "knot/conf/conf.h"
+#include "knot/nameserver/log.h"
+#include "libknot/packet/pkt.h"
+
+/*!
+ * \brief EDNS data.
+ */
+typedef struct {
+	uint16_t max_payload;
+	bool do_flag;
+	bool expire_option;
+} query_edns_data_t;
+
+typedef enum {
+	QUERY_EDNS_OPT_DO     = 1 << 0,
+	QUERY_EDNS_OPT_EXPIRE = 1 << 1,
+} query_edns_opt_t;
+
+/*!
+ * \brief Initialize new packet.
+ *
+ * Clear the packet and generate random transaction ID.
+ *
+ * \param pkt  Packet to initialize.
+ */
+void query_init_pkt(knot_pkt_t *pkt);
+
+/*!
+ * \brief Initialize EDNS parameters from server configuration.
+ *
+ * \param[in]  conf           Server configuration.
+ * \param[in]  remote_family  Address family for remote host.
+ * \param[in]  opts           EDNS options.
+ *
+ * \return EDNS parameters.
+ */
+query_edns_data_t query_edns_data_init(conf_t *conf, int remote_family,
+                                       query_edns_opt_t opts);
+
+/*!
+ * \brief Append EDNS into the packet.
+ *
+ * \param pkt   Packet to add EDNS into.
+ * \param edns  EDNS data.
+ *
+ * \return KNOT_E*
+ */
+int query_put_edns(knot_pkt_t *pkt, const query_edns_data_t *edns);