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package dhcp6opts
import (
"io"
"github.com/mdlayher/dhcp6"
"github.com/mdlayher/dhcp6/internal/buffer"
)
// IATA represents an Identity Association for Temporary Addresses, as
// defined in RFC 3315, Section 22.5.
//
// Multiple IATAs may be present in a single DHCP request.
type IATA struct {
// IAID specifies a DHCP identity association identifier. The IAID
// is a unique, client-generated identifier.
IAID [4]byte
// Options specifies a map of DHCP options specific to this IATA.
// Its methods can be used to retrieve data from an incoming IATA, or send
// data with an outgoing IATA.
Options dhcp6.Options
}
// NewIATA creates a new IATA from an IAID and an Options map. If an Options
// map is not specified, a new one will be allocated.
func NewIATA(iaid [4]byte, options dhcp6.Options) *IATA {
if options == nil {
options = make(dhcp6.Options)
}
return &IATA{
IAID: iaid,
Options: options,
}
}
// MarshalBinary allocates a byte slice containing the data from a IATA.
func (i *IATA) MarshalBinary() ([]byte, error) {
// 4 bytes: IAID
// N bytes: options slice byte count
b := buffer.New(nil)
b.WriteBytes(i.IAID[:])
opts, err := i.Options.MarshalBinary()
if err != nil {
return nil, err
}
b.WriteBytes(opts)
return b.Data(), nil
}
// UnmarshalBinary unmarshals a raw byte slice into a IATA.
//
// If the byte slice does not contain enough data to form a valid IATA,
// io.ErrUnexpectedEOF is returned.
func (i *IATA) UnmarshalBinary(p []byte) error {
b := buffer.New(p)
// IATA must contain at least an IAID.
if b.Len() < 4 {
return io.ErrUnexpectedEOF
}
b.ReadBytes(i.IAID[:])
return (&i.Options).UnmarshalBinary(b.Remaining())
}
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