1 files changed, 96 insertions, 0 deletions
diff --git a/src/knot/nameserver/xfr.c b/src/knot/nameserver/xfr.c
new file mode 100644
index 0000000..b54a4ff
--- /dev/null
+++ b/src/knot/nameserver/xfr.c
@@ -0,0 +1,96 @@
+/*  Copyright (C) 2018 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/>.
+ */
+
+#include "knot/nameserver/xfr.h"
+#include "contrib/mempattern.h"
+
+int xfr_process_list(knot_pkt_t *pkt, xfr_put_cb put, knotd_qdata_t *qdata)
+{
+	if (pkt == NULL || qdata == NULL || qdata->extra->ext == NULL) {
+		return KNOT_EINVAL;
+	}
+
+	int ret = KNOT_EOK;
+	knot_mm_t *mm = qdata->mm;
+	struct xfr_proc *xfer = qdata->extra->ext;
+
+	/* Check if the zone wasn't expired during multi-message transfer. */
+	const zone_contents_t *contents = qdata->extra->contents;
+	if (contents == NULL) {
+		return KNOT_ENOZONE;
+	}
+	knot_rrset_t soa_rr = node_rrset(contents->apex, KNOT_RRTYPE_SOA);
+
+	/* Prepend SOA on first packet. */
+	if (xfer->stats.messages == 0) {
+		ret = knot_pkt_put(pkt, 0, &soa_rr, KNOT_PF_NOTRUNC);
+		if (ret != KNOT_EOK) {
+			return ret;
+		}
+	}
+
+	/* Process all items in the list. */
+	while (!EMPTY_LIST(xfer->nodes)) {
+		ptrnode_t *head = HEAD(xfer->nodes);
+		ret = put(pkt, head->d, xfer);
+		if (ret == KNOT_EOK) { /* Finished. */
+			/* Complete change set. */
+			rem_node((node_t *)head);
+			mm_free(mm, head);
+		} else { /* Packet full or other error. */
+			break;
+		}
+	}
+
+	/* Append SOA on last packet. */
+	if (ret == KNOT_EOK) {
+		ret = knot_pkt_put(pkt, 0, &soa_rr, KNOT_PF_NOTRUNC);
+	}
+
+	/* Update counters. */
+	xfr_stats_add(&xfer->stats, pkt->size + knot_rrset_size(&qdata->opt_rr));
+
+	/* If a rrset is larger than the message,
+	 * fail to avoid infinite loop of empty messages */
+	if (ret == KNOT_ESPACE && pkt->rrset_count < 1) {
+		return KNOT_ENOXFR;
+	}
+
+	return ret;
+}
+
+void xfr_stats_begin(struct xfr_stats *stats)
+{
+	assert(stats);
+
+	memset(stats, 0, sizeof(*stats));
+	stats->begin = time_now();
+}
+
+void xfr_stats_add(struct xfr_stats *stats, unsigned bytes)
+{
+	assert(stats);
+
+	stats->messages += 1;
+	stats->bytes += bytes;
+}
+
+void xfr_stats_end(struct xfr_stats *stats)
+{
+	assert(stats);
+
+	stats->end = time_now();
+}