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package dhcpv4
import "fmt"
// This option implements the domain name option
// https://tools.ietf.org/html/rfc2132
// OptDomainName represents an option encapsulating the domain name.
type OptDomainName struct {
DomainName string
}
// ParseOptDomainName returns a new OptDomainName from a byte
// stream, or error if any.
func ParseOptDomainName(data []byte) (*OptDomainName, error) {
if len(data) < 3 {
return nil, ErrShortByteStream
}
code := OptionCode(data[0])
if code != OptionDomainName {
return nil, fmt.Errorf("expected code %v, got %v", OptionDomainName, code)
}
length := int(data[1])
if len(data) < 2+length {
return nil, ErrShortByteStream
}
return &OptDomainName{DomainName: string(data[2 : 2+length])}, nil
}
// Code returns the option code.
func (o *OptDomainName) Code() OptionCode {
return OptionDomainName
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptDomainName) ToBytes() []byte {
return append([]byte{byte(o.Code()), byte(o.Length())}, []byte(o.DomainName)...)
}
// String returns a human-readable string.
func (o *OptDomainName) String() string {
return fmt.Sprintf("Domain Name -> %v", o.DomainName)
}
// Length returns the length of the data portion (excluding option code an byte
// length).
func (o *OptDomainName) Length() int {
return len(o.DomainName)
}
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