v6: add FQDN option getter

Signed-off-by: Chris Koch <chrisko@google.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/dhcpv6/dhcpv6message.go b/dhcpv6/dhcpv6message.go
index ced5f9e..8ba7943 100644
--- a/dhcpv6/dhcpv6message.go
+++ b/dhcpv6/dhcpv6message.go
@@ -168,6 +168,18 @@ func (mo MessageOptions) ElapsedTime() time.Duration {
 	return 0
 }
 
+// FQDN returns the FQDN option as defined by RFC 4704.
+func (mo MessageOptions) FQDN() *OptFQDN {
+	opt := mo.Options.GetOne(OptionFQDN)
+	if opt == nil {
+		return nil
+	}
+	if fqdn, ok := opt.(*OptFQDN); ok {
+		return fqdn
+	}
+	return nil
+}
+
 // Message represents a DHCPv6 Message as defined by RFC 3315 Section 6.
 type Message struct {
 	MessageType   MessageType