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package dhcpv6
// This module defines the OptServerId and DUID structures.
// https://www.ietf.org/rfc/rfc3315.txt
import (
"encoding/binary"
"fmt"
)
// OptServerId represents a Client ID option
type OptServerId struct {
Sid Duid
}
func (op *OptServerId) Code() OptionCode {
return OPTION_SERVERID
}
func (op *OptServerId) ToBytes() []byte {
buf := make([]byte, 4)
binary.BigEndian.PutUint16(buf[0:2], uint16(OPTION_SERVERID))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
buf = append(buf, op.Sid.ToBytes()...)
return buf
}
func (op *OptServerId) Length() int {
return op.Sid.Length()
}
func (op *OptServerId) String() string {
return fmt.Sprintf("OptServerId{sid=%v}", op.Sid.String())
}
// ParseOptServerId builds an OptServerId structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func ParseOptServerId(data []byte) (*OptServerId, error) {
if len(data) < 2 {
// at least the DUID type is necessary to continue
return nil, fmt.Errorf("Invalid OptServerId data: shorter than 2 bytes")
}
opt := OptServerId{}
sid, err := DuidFromBytes(data)
if err != nil {
return nil, err
}
opt.Sid = *sid
return &opt, nil
}
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