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package dhcpv6
// This module defines the OptRemoteId structure.
// https://www.ietf.org/rfc/rfc4649.txt
import (
"encoding/binary"
"fmt"
)
type OptRemoteId struct {
enterpriseNumber uint32
remoteId []byte
}
func (op *OptRemoteId) Code() OptionCode {
return OPTION_REMOTE_ID
}
func (op *OptRemoteId) ToBytes() []byte {
buf := make([]byte, 8)
binary.BigEndian.PutUint16(buf[0:2], uint16(OPTION_REMOTE_ID))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
binary.BigEndian.PutUint32(buf[4:8], uint32(op.enterpriseNumber))
buf = append(buf, op.remoteId...)
return buf
}
func (op *OptRemoteId) EnterpriseNumber() uint32 {
return op.enterpriseNumber
}
func (op *OptRemoteId) SetEnterpriseNumber(enterpriseNumber uint32) {
op.enterpriseNumber = enterpriseNumber
}
func (op *OptRemoteId) RemoteID() []byte {
return op.remoteId
}
func (op *OptRemoteId) SetRemoteID(remoteId []byte) {
op.remoteId = append([]byte(nil), remoteId...)
}
func (op *OptRemoteId) Length() int {
return 4 + len(op.remoteId)
}
func (op *OptRemoteId) String() string {
return fmt.Sprintf("OptRemoteId{enterprisenum=%v, remoteid=%v}",
op.enterpriseNumber, op.remoteId,
)
}
// build an OptRemoteId structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func ParseOptRemoteId(data []byte) (*OptRemoteId, error) {
opt := OptRemoteId{}
if len(data) < 4 {
return nil, fmt.Errorf("Invalid remote id data length. Expected at least 4 bytes, got %v", len(data))
}
opt.enterpriseNumber = binary.BigEndian.Uint32(data[:4])
opt.remoteId = append([]byte(nil), data[4:]...)
return &opt, nil
}
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