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package dhcpv6
// This module defines the OptClientId and DUID structures.
// https://www.ietf.org/rfc/rfc3315.txt
import (
"encoding/binary"
"fmt"
)
// OptClientId represents a Client ID option
type OptClientId struct {
Cid Duid
}
func (op *OptClientId) Code() OptionCode {
return OptionClientID
}
func (op *OptClientId) ToBytes() []byte {
buf := make([]byte, 4)
binary.BigEndian.PutUint16(buf[0:2], uint16(OptionClientID))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
buf = append(buf, op.Cid.ToBytes()...)
return buf
}
func (op *OptClientId) Length() int {
return op.Cid.Length()
}
func (op *OptClientId) String() string {
return fmt.Sprintf("OptClientId{cid=%v}", op.Cid.String())
}
// ParseOptClientId builds 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
}
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