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-rw-r--r--src/shared/dns-domain.c34
-rw-r--r--src/shared/dns-domain.h2
2 files changed, 36 insertions, 0 deletions
diff --git a/src/shared/dns-domain.c b/src/shared/dns-domain.c
index 7af15e0098..423ccca9cc 100644
--- a/src/shared/dns-domain.c
+++ b/src/shared/dns-domain.c
@@ -715,3 +715,37 @@ int dns_name_single_label(const char *name) {
return r == 0 && *name == 0;
}
+
+/* Encode a domain name according to RFC 1035 Section 3.1 */
+int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len) {
+ uint8_t *label_length;
+ uint8_t *out;
+ int r;
+
+ assert_return(buffer, -EINVAL);
+ assert_return(domain, -EINVAL);
+ assert_return(domain[0], -EINVAL);
+
+ out = buffer;
+
+ do {
+ /* reserve a byte for label length */
+ if (len == 0)
+ return -ENOBUFS;
+ len--;
+ label_length = out;
+ out++;
+
+ /* convert and copy a single label */
+ r = dns_label_unescape(&domain, (char *) out, len);
+ if (r < 0)
+ return r;
+
+ /* fill label length, move forward */
+ *label_length = r;
+ out += r;
+ len -= r;
+ } while (r != 0);
+
+ return out - buffer;
+}
diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h
index 1f0d242c18..b214897440 100644
--- a/src/shared/dns-domain.h
+++ b/src/shared/dns-domain.h
@@ -67,3 +67,5 @@ int dns_name_address(const char *p, int *family, union in_addr_union *a);
int dns_name_root(const char *name);
int dns_name_single_label(const char *name);
+
+int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len);