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package dhcp6opts
import (
"io"
"time"
"github.com/mdlayher/dhcp6"
"github.com/mdlayher/dhcp6/internal/buffer"
)
// IAPD represents an Identity Association for Prefix Delegation, as
// defined in RFC 3633, Section 9.
//
// Multiple IAPDs may be present in a single DHCP request.
type IAPD struct {
// IAID specifies a DHCP identity association identifier. The IAID
// is a unique, client-generated identifier.
IAID [4]byte
// T1 specifies how long a requesting router will wait to contact a
// delegating router, to extend the lifetimes of the prefixes delegated
// to this IAPD, by the delegating router.
T1 time.Duration
// T2 specifies how long a requesting router will wait to contact any
// available delegating router, to extend the lifetimes of the prefixes
// delegated to this IAPD.
T2 time.Duration
// Options specifies a map of DHCP options specific to this IAPD.
// Its methods can be used to retrieve data from an incoming IAPD, or send
// data with an outgoing IAPD.
Options dhcp6.Options
}
// NewIAPD creates a new IAPD from an IAID, T1 and T2 durations, and an
// Options map. If an Options map is not specified, a new one will be
// allocated.
func NewIAPD(iaid [4]byte, t1 time.Duration, t2 time.Duration, options dhcp6.Options) *IAPD {
if options == nil {
options = make(dhcp6.Options)
}
return &IAPD{
IAID: iaid,
T1: t1,
T2: t2,
Options: options,
}
}
// MarshalBinary allocates a byte slice containing the data from a IAPD.
func (i *IAPD) MarshalBinary() ([]byte, error) {
// 4 bytes: IAID
// 4 bytes: T1
// 4 bytes: T2
// N bytes: options slice byte count
buf := buffer.New(nil)
buf.WriteBytes(i.IAID[:])
buf.Write32(uint32(i.T1 / time.Second))
buf.Write32(uint32(i.T2 / time.Second))
opts, err := i.Options.MarshalBinary()
if err != nil {
return nil, err
}
buf.WriteBytes(opts)
return buf.Data(), nil
}
// UnmarshalBinary unmarshals a raw byte slice into a IAPD.
//
// If the byte slice does not contain enough data to form a valid IAPD,
// io.ErrUnexpectedEOF is returned.
func (i *IAPD) UnmarshalBinary(b []byte) error {
// IAPD must contain at least an IAID, T1, and T2.
buf := buffer.New(b)
if buf.Len() < 12 {
return io.ErrUnexpectedEOF
}
copy(i.IAID[:], buf.Consume(4))
i.T1 = time.Duration(buf.Read32()) * time.Second
i.T2 = time.Duration(buf.Read32()) * time.Second
return (&i.Options).UnmarshalBinary(buf.Remaining())
}
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