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package dhcpv6
// This module defines the OptStatusCode structure.
// https://www.ietf.org/rfc/rfc3315.txt
import (
"encoding/binary"
"fmt"
"github.com/insomniacslk/dhcp/iana"
)
// OptStatusCode represents a DHCPv6 Status Code option
type OptStatusCode struct {
StatusCode iana.StatusCode
StatusMessage []byte
}
// Code returns the option code
func (op *OptStatusCode) Code() OptionCode {
return OptionStatusCode
}
// ToBytes serializes the option and returns it as a sequence of bytes
func (op *OptStatusCode) ToBytes() []byte {
buf := make([]byte, 6)
binary.BigEndian.PutUint16(buf[0:2], uint16(OptionStatusCode))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
binary.BigEndian.PutUint16(buf[4:6], uint16(op.StatusCode))
buf = append(buf, op.StatusMessage...)
return buf
}
// Length returns the option length
func (op *OptStatusCode) Length() int {
return 2 + len(op.StatusMessage)
}
func (op *OptStatusCode) String() string {
return fmt.Sprintf("OptStatusCode{code=%s (%d), message=%v}",
iana.StatusCodeToString(op.StatusCode), op.StatusCode,
string(op.StatusMessage))
}
// ParseOptStatusCode builds an OptStatusCode structure from a sequence of
// bytes. The input data does not include option code and length bytes.
func ParseOptStatusCode(data []byte) (*OptStatusCode, error) {
if len(data) < 2 {
return nil, fmt.Errorf("Invalid OptStatusCode data: length is shorter than 2")
}
opt := OptStatusCode{}
opt.StatusCode = iana.StatusCode(binary.BigEndian.Uint16(data[0:2]))
opt.StatusMessage = append(opt.StatusMessage, data[2:]...)
return &opt, nil
}
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