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-rw-r--r--src/shared/dns-domain.c16
-rw-r--r--src/shared/dns-domain.h2
2 files changed, 16 insertions, 2 deletions
diff --git a/src/shared/dns-domain.c b/src/shared/dns-domain.c
index 5ac8ad5b7a..429aa6d2cb 100644
--- a/src/shared/dns-domain.c
+++ b/src/shared/dns-domain.c
@@ -865,7 +865,7 @@ bool dns_name_is_single_label(const char *name) {
}
/* Encode a domain name according to RFC 1035 Section 3.1, without compression */
-int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len) {
+int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical) {
uint8_t *label_length, *out;
int r;
@@ -890,6 +890,20 @@ int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len) {
if (r < 0)
return r;
+ if (canonical) {
+ size_t i;
+
+ /* Optionally, output the name in DNSSEC
+ * canonical format, as described in RFC 4034,
+ * section 6.2. Or in other words: in
+ * lower-case. */
+
+ for (i = 0; i < (size_t) r; i++) {
+ if (out[i] >= 'A' && out[i] <= 'Z')
+ out[i] = out[i] - 'A' + 'a';
+ }
+ }
+
/* Fill label length, move forward */
*label_length = r;
out += r;
diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h
index 44a9975541..17dab1da18 100644
--- a/src/shared/dns-domain.h
+++ b/src/shared/dns-domain.h
@@ -77,7 +77,7 @@ int dns_name_address(const char *p, int *family, union in_addr_union *a);
bool dns_name_is_root(const char *name);
bool dns_name_is_single_label(const char *name);
-int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len);
+int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len, bool canonical);
bool dns_srv_type_is_valid(const char *name);
bool dns_service_name_is_valid(const char *name);