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package dhcpv6
// This module defines the OptIANA structure.
// https://www.ietf.org/rfc/rfc3633.txt
import (
"encoding/binary"
"fmt"
)
type OptIANA struct {
iaId [4]byte
t1 uint32
t2 uint32
options []Option
}
func (op *OptIANA) Code() OptionCode {
return OPTION_IA_NA
}
func (op *OptIANA) ToBytes() []byte {
buf := make([]byte, 16)
binary.BigEndian.PutUint16(buf[0:2], uint16(OPTION_IA_NA))
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
}
func (op *OptIANA) IAID() []byte {
return op.iaId[:]
}
func (op *OptIANA) SetIAID(iaId [4]byte) {
op.iaId = iaId
}
func (op *OptIANA) T1() uint32 {
return op.t1
}
func (op *OptIANA) SetT1(t1 uint32) {
op.t1 = t1
}
func (op *OptIANA) T2() uint32 {
return op.t2
}
func (op *OptIANA) SetT2(t2 uint32) {
op.t2 = t2
}
func (op *OptIANA) Options() []Option {
return op.options
}
func (op *OptIANA) SetOptions(options []Option) {
op.options = options
}
func (op *OptIANA) Length() int {
l := 12
for _, opt := range op.options {
l += 4 + opt.Length()
}
return l
}
func (op *OptIANA) String() string {
return fmt.Sprintf("OptIANA{IAID=%v, t1=%v, t2=%v, options=%v}",
op.iaId, op.t1, op.t2, op.options)
}
// build an OptIANA structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func ParseOptIANA(data []byte) (*OptIANA, error) {
opt := OptIANA{}
if len(data) < 12 {
return nil, fmt.Errorf("Invalid IA for Non-temporary Addresses 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])
var err error
if len(data[12:]) > 0 {
opt.options, err = OptionsFromBytes(data[12:])
if err != nil {
return nil, err
}
}
return &opt, nil
}
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