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package dhcpv4
import (
"fmt"
"net"
"github.com/u-root/u-root/pkg/uio"
)
// OptSubnetMask implements the subnet mask option described by RFC 2132,
// Section 3.3.
type OptSubnetMask struct {
SubnetMask net.IPMask
}
// ParseOptSubnetMask returns a new OptSubnetMask from a byte
// stream, or error if any.
func ParseOptSubnetMask(data []byte) (*OptSubnetMask, error) {
buf := uio.NewBigEndianBuffer(data)
return &OptSubnetMask{SubnetMask: net.IPMask(buf.CopyN(net.IPv4len))}, buf.FinError()
}
// Code returns the option code.
func (o *OptSubnetMask) Code() OptionCode {
return OptionSubnetMask
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptSubnetMask) ToBytes() []byte {
return o.SubnetMask[:net.IPv4len]
}
// String returns a human-readable string.
func (o *OptSubnetMask) String() string {
return fmt.Sprintf("Subnet Mask -> %v", o.SubnetMask.String())
}
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