1 files changed, 57 insertions, 0 deletions
diff --git a/dhcpv6/option_clientid.go b/dhcpv6/option_clientid.go
new file mode 100644
index 0000000..1a61047
--- /dev/null
+++ b/dhcpv6/option_clientid.go
@@ -0,0 +1,57 @@
+package dhcpv6
+
+// This module defines the OptClientId and DUID structures.
+// https://www.ietf.org/rfc/rfc3315.txt
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+type OptClientId struct {
+	cid Duid
+}
+
+func (op *OptClientId) Code() OptionCode {
+	return OPTION_CLIENTID
+}
+
+func (op *OptClientId) ToBytes() []byte {
+	buf := make([]byte, 4)
+	binary.BigEndian.PutUint16(buf[0:2], uint16(OPTION_CLIENTID))
+	binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
+	buf = append(buf, op.cid.ToBytes()...)
+	return buf
+}
+
+func (op *OptClientId) ClientID() Duid {
+	return op.cid
+}
+
+func (op *OptClientId) SetClientID(cid Duid) {
+	op.cid = cid
+}
+
+func (op *OptClientId) Length() int {
+	return op.cid.Length()
+}
+
+func (op *OptClientId) String() string {
+	return fmt.Sprintf("OptClientId{cid=%v}", op.cid.String())
+}
+
+// build an OptClientId structure from a sequence of bytes.
+// The input data does not include option code and length bytes.
+func ParseOptClientId(data []byte) (*OptClientId, error) {
+	if len(data) < 2 {
+		// at least the DUID type is necessary to continue
+		return nil, fmt.Errorf("Invalid OptClientId data: shorter than 2 bytes")
+	}
+	opt := OptClientId{}
+	cid, err := DuidFromBytes(data)
+	if err != nil {
+		return nil, err
+	}
+	opt.cid = *cid
+	return &opt, nil
+}