1 files changed, 16 insertions, 0 deletions
diff --git a/vendor/github.com/xenolf/lego/challenge/dns01/cname.go b/vendor/github.com/xenolf/lego/challenge/dns01/cname.go
new file mode 100644
index 00000000..619c8476
--- /dev/null
+++ b/vendor/github.com/xenolf/lego/challenge/dns01/cname.go
@@ -0,0 +1,16 @@
+package dns01
+
+import "github.com/miekg/dns"
+
+// Update FQDN with CNAME if any
+func updateDomainWithCName(r *dns.Msg, fqdn string) string {
+	for _, rr := range r.Answer {
+		if cn, ok := rr.(*dns.CNAME); ok {
+			if cn.Hdr.Name == fqdn {
+				return cn.Target
+			}
+		}
+	}
+
+	return fqdn
+}