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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 OptionIANA
}
func (op *OptIANA) ToBytes() []byte {
buf := make([]byte, 16)
binary.BigEndian.PutUint16(buf[0:2], uint16(OptionIANA))
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) 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)
}
// AddOption adds an option at the end of the IA_NA options
func (op *OptIANA) AddOption(opt Option) {
op.Options = append(op.Options, opt)
}
// GetOneOption will get an option of the give type from the Options field, if
// it is present. It will return `nil` otherwise
func (op *OptIANA) GetOneOption(code OptionCode) Option {
return getOption(op.Options, code)
}
// DelOption will remove all the options that match a Option code.
func (op *OptIANA) DelOption(code OptionCode) {
op.Options = delOption(op.Options, code)
}
// 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) {
var err 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])
opt.Options, err = OptionsFromBytes(data[12:])
if err != nil {
return nil, err
}
return &opt, nil
}
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