1 files changed, 63 insertions, 0 deletions
diff --git a/src/knot/nameserver/ixfr.h b/src/knot/nameserver/ixfr.h
new file mode 100644
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+++ b/src/knot/nameserver/ixfr.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 "knot/journal/journal_read.h"
+#include "knot/nameserver/process_query.h"
+#include "knot/nameserver/xfr.h"
+#include "libknot/packet/pkt.h"
+
+/*! \brief IXFR-in processing states. */
+enum ixfr_state {
+	IXFR_INVALID = 0,
+	IXFR_START,      /* IXFR-in starting, expecting final SOA. */
+	IXFR_SOA_DEL,    /* Expecting starting SOA. */
+	IXFR_SOA_ADD,    /* Expecting ending SOA. */
+	IXFR_DEL,        /* Expecting RR to delete. */
+	IXFR_ADD,        /* Expecting RR to add. */
+	IXFR_DONE        /* Processing done, IXFR-in complete. */
+};
+
+/*! \brief Extended structure for IXFR-in/IXFR-out processing. */
+struct ixfr_proc {
+	/* Processing state. */
+	struct xfr_proc proc;
+	enum ixfr_state state;
+	bool in_remove_section;
+
+	/* Changes to be sent. */
+	journal_read_t *journal_ctx;
+
+	/* Currently processed RRSet. */
+	knot_rrset_t cur_rr;
+
+	/* Processing context. */
+	knotd_qdata_t *qdata;
+	knot_mm_t *mm;
+	uint32_t soa_from;
+	uint32_t soa_to;
+	uint32_t soa_last;
+};
+
+/*!
+ * \brief IXFR query processing module.
+ *
+ * \retval PRODUCE if it has an answer, but not yet finished.
+ * \retval FAIL if it encountered an error.
+ * \retval DONE if finished.
+ */
+int ixfr_process_query(knot_pkt_t *pkt, knotd_qdata_t *qdata);