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// This module defines the optRelayPort structure.
// https://www.ietf.org/rfc/rfc8357.txt
package dhcpv6
import (
"fmt"
"github.com/u-root/uio/uio"
)
// OptRelayPort specifies an UDP port to use for the downstream relay
func OptRelayPort(port uint16) Option {
return &optRelayPort{DownstreamSourcePort: port}
}
type optRelayPort struct {
DownstreamSourcePort uint16
}
func (op *optRelayPort) Code() OptionCode {
return OptionRelayPort
}
func (op *optRelayPort) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
buf.Write16(op.DownstreamSourcePort)
return buf.Data()
}
func (op *optRelayPort) String() string {
return fmt.Sprintf("RelayPort: %d", op.DownstreamSourcePort)
}
// build an optRelayPort structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func parseOptRelayPort(data []byte) (*optRelayPort, error) {
var opt optRelayPort
buf := uio.NewBigEndianBuffer(data)
opt.DownstreamSourcePort = buf.Read16()
return &opt, buf.FinError()
}
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