1 files changed, 12 insertions, 0 deletions
diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h
index 3f8f621802..dd8ae3ac98 100644
--- a/src/shared/dns-domain.h
+++ b/src/shared/dns-domain.h
@@ -42,11 +42,18 @@
 /* Maximum length of a full hostname, on the wire, including the final NUL byte */
 #define DNS_WIRE_FOMAT_HOSTNAME_MAX 255
 
+/* Maximum number of labels per valid hostname */
+#define DNS_N_LABELS_MAX 127
+
 int dns_label_unescape(const char **name, char *dest, size_t sz);
 int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz);
 int dns_label_escape(const char *p, size_t l, char *dest, size_t sz);
 int dns_label_escape_new(const char *p, size_t l, char **ret);
 
+static inline int dns_name_parent(const char **name) {
+        return dns_label_unescape(name, NULL, DNS_LABEL_MAX);
+}
+
 int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);
 int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);
 
@@ -92,3 +99,8 @@ bool dns_service_name_is_valid(const char *name);
 
 int dns_service_join(const char *name, const char *type, const char *domain, char **ret);
 int dns_service_split(const char *joined, char **name, char **type, char **domain);
+
+int dns_name_suffix(const char *name, unsigned n_labels, const char **ret);
+int dns_name_count_labels(const char *name);
+
+int dns_name_equal_skip(const char *a, unsigned n_labels, const char *b);