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package dhcpv6
import (
"encoding/binary"
"fmt"
)
// OptIAForPrefixDelegation implements the identity association for prefix
// delegation option defined by RFC 3633, Section 9.
type OptIAForPrefixDelegation struct {
IaId [4]byte
T1 uint32
T2 uint32
Options Options
}
// Code returns the option code
func (op *OptIAForPrefixDelegation) Code() OptionCode {
return OptionIAPD
}
// ToBytes serializes the option and returns it as a sequence of bytes
func (op *OptIAForPrefixDelegation) ToBytes() []byte {
buf := make([]byte, 16)
binary.BigEndian.PutUint16(buf[0:2], uint16(OptionIAPD))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
copy(buf[4:8], op.IaId[:])
binary.BigEndian.PutUint32(buf[8:12], op.T1)
binary.BigEndian.PutUint32(buf[12:16], op.T2)
for _, opt := range op.Options {
buf = append(buf, opt.ToBytes()...)
}
return buf
}
// Length returns the option length
func (op *OptIAForPrefixDelegation) Length() int {
l := 12
for _, opt := range op.Options {
l += 4 + opt.Length()
}
return l
}
// String returns a string representation of the OptIAForPrefixDelegation data
func (op *OptIAForPrefixDelegation) String() string {
return fmt.Sprintf("OptIAForPrefixDelegation{IAID=%v, t1=%v, t2=%v, options=%v}",
op.IaId, op.T1, op.T2, op.Options)
}
// GetOneOption will get an option of the give type from the Options field, if
// it is present. It will return `nil` otherwise
func (op *OptIAForPrefixDelegation) GetOneOption(code OptionCode) Option {
return op.Options.GetOne(code)
}
// DelOption will remove all the options that match a Option code.
func (op *OptIAForPrefixDelegation) DelOption(code OptionCode) {
op.Options.Del(code)
}
// build an OptIAForPrefixDelegation structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func ParseOptIAForPrefixDelegation(data []byte) (*OptIAForPrefixDelegation, error) {
opt := OptIAForPrefixDelegation{}
if len(data) < 12 {
return nil, fmt.Errorf("Invalid IA for Prefix Delegation data length. Expected at least 12 bytes, got %v", len(data))
}
copy(opt.IaId[:], data[:4])
opt.T1 = binary.BigEndian.Uint32(data[4:8])
opt.T2 = binary.BigEndian.Uint32(data[8:12])
if err := opt.Options.FromBytes(data[12:]); err != nil {
return nil, err
}
return &opt, nil
}
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