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package dhcpv4
import (
"net"
"github.com/u-root/u-root/pkg/uio"
)
// IPMask represents an option encapsulating the subnet mask.
//
// This option implements the subnet mask option in RFC 2132, Section 3.3.
type IPMask net.IPMask
// ToBytes returns a serialized stream of bytes for this option.
func (im IPMask) ToBytes() []byte {
if len(im) > net.IPv4len {
return im[:net.IPv4len]
}
return im
}
// String returns a human-readable string.
func (im IPMask) String() string {
return net.IPMask(im).String()
}
// FromBytes parses im from data per RFC 2132.
func (im *IPMask) FromBytes(data []byte) error {
buf := uio.NewBigEndianBuffer(data)
*im = IPMask(buf.CopyN(net.IPv4len))
return buf.FinError()
}
// OptSubnetMask returns a new DHCPv4 SubnetMask option per RFC 2132, Section 3.3.
func OptSubnetMask(mask net.IPMask) Option {
return Option{
Code: OptionSubnetMask,
Value: IPMask(mask),
}
}
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