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package dhcp6opts
import (
"io"
"github.com/mdlayher/dhcp6"
"github.com/mdlayher/dhcp6/internal/buffer"
)
// A VendorOpts is used by clients and servers to exchange
// VendorOpts information.
type VendorOpts struct {
// EnterpriseNumber specifies an IANA-assigned vendor Private Enterprise
// Number.
EnterpriseNumber uint32
// An opaque object of option-len octets,
// interpreted by vendor-specific code on the
// clients and servers
Options dhcp6.Options
}
// MarshalBinary allocates a byte slice containing the data from a VendorOpts.
func (v *VendorOpts) MarshalBinary() ([]byte, error) {
// 4 bytes: EnterpriseNumber
// N bytes: options slice byte count
b := buffer.New(nil)
b.Write32(v.EnterpriseNumber)
opts, err := v.Options.MarshalBinary()
if err != nil {
return nil, err
}
b.WriteBytes(opts)
return b.Data(), nil
}
// UnmarshalBinary unmarshals a raw byte slice into a VendorOpts.
// If the byte slice does not contain enough data to form a valid
// VendorOpts, io.ErrUnexpectedEOF is returned.
// If option-data are invalid, then ErrInvalidPacket is returned.
func (v *VendorOpts) UnmarshalBinary(p []byte) error {
b := buffer.New(p)
// Too short to be valid VendorOpts
if b.Len() < 4 {
return io.ErrUnexpectedEOF
}
v.EnterpriseNumber = b.Read32()
if err := (&v.Options).UnmarshalBinary(b.Remaining()); err != nil {
// Invalid options means an invalid RelayMessage
return dhcp6.ErrInvalidPacket
}
return nil
}
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