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package dhcpv4
import (
"math"
"time"
"github.com/u-root/uio/uio"
)
// MaxLeaseTime is the maximum lease time that can be encoded.
var MaxLeaseTime = math.MaxUint32 * time.Second
// Duration implements the IP address lease time option described by RFC 2132,
// Section 9.2.
type Duration time.Duration
// FromBytes parses a duration from a byte stream according to RFC 2132, Section 9.2.
func (d *Duration) FromBytes(data []byte) error {
buf := uio.NewBigEndianBuffer(data)
*d = Duration(time.Duration(buf.Read32()) * time.Second)
return buf.FinError()
}
// ToBytes returns a serialized stream of bytes for this option.
func (d Duration) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
buf.Write32(uint32(time.Duration(d) / time.Second))
return buf.Data()
}
// String returns a human-readable string for this option.
func (d Duration) String() string {
return time.Duration(d).String()
}
// OptIPAddressLeaseTime returns a new IP address lease time option.
//
// The IP address lease time option is described by RFC 2132, Section 9.2.
func OptIPAddressLeaseTime(d time.Duration) Option {
return Option{Code: OptionIPAddressLeaseTime, Value: Duration(d)}
}
// The IP address renew time option as described by RFC 2132, Section 9.11.
func OptRenewTimeValue(d time.Duration) Option {
return Option{Code: OptionRenewTimeValue, Value: Duration(d)}
}
// The IP address rebinding time option as described by RFC 2132, Section 9.12.
func OptRebindingTimeValue(d time.Duration) Option {
return Option{Code: OptionRebindingTimeValue, Value: Duration(d)}
}
// The IPv6-Only Preferred option is described by RFC 8925, Section 3.1
func OptIPv6OnlyPreferred(d time.Duration) Option {
return Option{Code: OptionIPv6OnlyPreferred, Value: Duration(d)}
}
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