Ghost User
--- a/src/libknot/rrset.h
+++ b/src/libknot/rrset.h
 */
 uint32_t knot_rrset_ttl(const knot_rrset_t *rrset);

+/*!
+* \brief Convert one RR into canonical format.
+*
+* Owner is always converted to lowercase. RDATA domain names are converted only
+* for types listed in RFC 4034, Section 6.2, except for NSEC (updated by
+* RFC 6840, Section 5.1) and A6 (not supported).
+*
+* \note If RRSet with more RRs is given to this function, only the first RR
+*       will be converted.
--- a/src/libknot/dname.c
+++ b/src/libknot/dname.c
 	while(sp != lstack) {          /* consume stack */
 		l = *--sp; /* fetch rightmost label */
 		memcpy(dst, l+1, *l);  /* write label */
+		for (int i = 0; i < *l; ++i) {   /* convert to lowercase */
+			dst[i] = knot_tolower(dst[i]);
+		}
--- a/src/libknot/packet/rrset-wire.c
+++ b/src/libknot/packet/rrset-wire.c
 	assert(dst && *dst);
 	assert(dst_avail);
 	assert(dname_cfg);
-	UNUSED(flags);
+	UNUSED(dname_type);

-	int compr_size = knot_dname_wire_check(*src, *src + *src_avail, dname_cfg->pkt_wire);
+	int compr_size = knot_dname_wire_check(*src, *src + *src_avail,
--- a/src/libknot/rrset.c
+++ b/src/libknot/rrset.c
+		return KNOT_EINVAL;
+	}
+
+	/* Convert owner for all RRSets. */
+	int ret = knot_dname_to_lower(rrset->owner);
+	if (ret != KNOT_EOK) {
+		return ret;
+	}
+
+	/* Convert DNAMEs in RDATA only for RFC4034 types. */
+	if (knot_rrtype_should_be_lowercased(rrset->type)) {
+		const rdata_descriptor_t *desc =
+		                knot_get_rdata_descriptor(rrset->type);
+		if (desc->type_name == NULL) {
+			desc = knot_get_obsolete_rdata_descriptor(rrset->type);
+		}