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package dhcpv6
import (
"fmt"
"time"
"github.com/u-root/uio/uio"
)
// PDOptions are options used with the IAPD (prefix delegation) option.
//
// RFC 3633 describes that IA_PD-options may contain the IAPrefix option and
// the StatusCode option.
type PDOptions struct {
Options
}
// Prefixes are the prefixes associated with this delegation.
func (po PDOptions) Prefixes() []*OptIAPrefix {
opts := po.Options.Get(OptionIAPrefix)
pre := make([]*OptIAPrefix, 0, len(opts))
for _, o := range opts {
if iap, ok := o.(*OptIAPrefix); ok {
pre = append(pre, iap)
}
}
return pre
}
// Status returns the status code associated with this option.
func (po PDOptions) Status() *OptStatusCode {
opt := po.Options.GetOne(OptionStatusCode)
if opt == nil {
return nil
}
sc, ok := opt.(*OptStatusCode)
if !ok {
return nil
}
return sc
}
// OptIAPD implements the identity association for prefix
// delegation option defined by RFC 3633, Section 9.
type OptIAPD struct {
IaId [4]byte
T1 time.Duration
T2 time.Duration
Options PDOptions
}
// Code returns the option code
func (op *OptIAPD) Code() OptionCode {
return OptionIAPD
}
// ToBytes serializes the option and returns it as a sequence of bytes
func (op *OptIAPD) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
buf.WriteBytes(op.IaId[:])
t1 := Duration{op.T1}
t1.Marshal(buf)
t2 := Duration{op.T2}
t2.Marshal(buf)
buf.WriteBytes(op.Options.ToBytes())
return buf.Data()
}
// String returns a string representation of the OptIAPD data
func (op *OptIAPD) String() string {
return fmt.Sprintf("IAPD: {IAID=%v, t1=%v, t2=%v, Options=[%v]}",
op.IaId, op.T1, op.T2, op.Options)
}
// ParseOptIAPD builds an OptIAPD structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func ParseOptIAPD(data []byte) (*OptIAPD, error) {
var opt OptIAPD
buf := uio.NewBigEndianBuffer(data)
buf.ReadBytes(opt.IaId[:])
var t1, t2 Duration
t1.Unmarshal(buf)
t2.Unmarshal(buf)
opt.T1 = t1.Duration
opt.T2 = t2.Duration
if err := opt.Options.FromBytes(buf.ReadAll()); err != nil {
return nil, err
}
return &opt, buf.FinError()
}
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