1 files changed, 23 insertions, 8 deletions

diff --git a/src/resolve/resolved-dns-answer.h b/src/resolve/resolved-dns-answer.h
index 89c254b02e..8d95131dbe 100644
--- a/src/resolve/resolved-dns-answer.h
+++ b/src/resolve/resolved-dns-answer.h
@@ -30,7 +30,9 @@ typedef struct DnsAnswerItem DnsAnswerItem;
 /* A simple array of resource records. We keep track of the
  * originating ifindex for each RR where that makes sense, so that we
  * can qualify A and AAAA RRs referring to a local link with the
- * right ifindex. */
+ * right ifindex.
+ *
+ * Note that we usually encode the empty answer as a simple NULL. */
 
 struct DnsAnswerItem {
         DnsResourceRecord *rr;
@@ -48,15 +50,28 @@ DnsAnswer *dns_answer_ref(DnsAnswer *a);
 DnsAnswer *dns_answer_unref(DnsAnswer *a);
 
 int dns_answer_add(DnsAnswer *a, DnsResourceRecord *rr, int ifindex);
+int dns_answer_add_extend(DnsAnswer **a, DnsResourceRecord *rr, int ifindex);
 int dns_answer_add_soa(DnsAnswer *a, const char *name, uint32_t ttl);
-int dns_answer_contains(DnsAnswer *a, DnsResourceKey *key);
-int dns_answer_match_soa(DnsResourceKey *key, DnsResourceKey *soa);
-int dns_answer_find_soa(DnsAnswer *a, DnsResourceKey *key, DnsResourceRecord **ret);
 
-DnsAnswer *dns_answer_merge(DnsAnswer *a, DnsAnswer *b);
+int dns_answer_match_key(DnsAnswer *a, const DnsResourceKey *key);
+int dns_answer_contains_rr(DnsAnswer *a, DnsResourceRecord *rr);
+
+int dns_answer_find_soa(DnsAnswer *a, const DnsResourceKey *key, DnsResourceRecord **ret);
+
+int dns_answer_merge(DnsAnswer *a, DnsAnswer *b, DnsAnswer **ret);
+int dns_answer_extend(DnsAnswer **a, DnsAnswer *b);
+
 void dns_answer_order_by_scope(DnsAnswer *a, bool prefer_link_local);
 
 int dns_answer_reserve(DnsAnswer **a, unsigned n_free);
+int dns_answer_reserve_or_clone(DnsAnswer **a, unsigned n_free);
+
+int dns_answer_remove_by_key(DnsAnswer **a, const DnsResourceKey *key);
+int dns_answer_copy_by_key(DnsAnswer **a, DnsAnswer *source, const DnsResourceKey *key);
+
+static inline unsigned dns_answer_size(DnsAnswer *a) {
+        return a ? a->n_rrs : 0;
+}
 
 DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
 
@@ -70,13 +85,13 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(DnsAnswer*, dns_answer_unref);
 
 #define DNS_ANSWER_FOREACH(kk, a) _DNS_ANSWER_FOREACH(UNIQ, kk, a)
 
-#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifindex, a)                  \
+#define _DNS_ANSWER_FOREACH_IFINDEX(q, kk, ifi, a)                      \
         for (unsigned UNIQ_T(i, q) = ({                                 \
                                 (kk) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].rr : NULL; \
-                                (ifindex) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
+                                (ifi) = ((a) && (a)->n_rrs > 0) ? (a)->items[0].ifindex : 0; \
                                 0;                                      \
                         });                                             \
              (a) && (UNIQ_T(i, q) < (a)->n_rrs);                        \
-             UNIQ_T(i, q)++, (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), (ifindex) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0))
+             UNIQ_T(i, q)++, (kk) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].rr : NULL), (ifi) = ((UNIQ_T(i, q) < (a)->n_rrs) ? (a)->items[UNIQ_T(i, q)].ifindex : 0))
 
 #define DNS_ANSWER_FOREACH_IFINDEX(kk, ifindex, a) _DNS_ANSWER_FOREACH_IFINDEX(UNIQ, kk, ifindex, a)