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package bsdp
import (
"fmt"
"github.com/insomniacslk/dhcp/dhcpv4"
)
// Implements the BSDP option version. Can be one of 1.0 or 1.1
// Specific versions.
var (
Version1_0 = []byte{1, 0}
Version1_1 = []byte{1, 1}
)
// OptVersion represents a BSDP protocol version.
type OptVersion struct {
Version []byte
}
// ParseOptVersion constructs an OptVersion struct from a sequence of
// bytes and returns it, or an error.
func ParseOptVersion(data []byte) (*OptVersion, error) {
if len(data) < 4 {
return nil, dhcpv4.ErrShortByteStream
}
code := dhcpv4.OptionCode(data[0])
if code != OptionVersion {
return nil, fmt.Errorf("expected option %v, got %v instead", OptionVersion, code)
}
length := int(data[1])
if length != 2 {
return nil, fmt.Errorf("expected length 2, got %d instead", length)
}
return &OptVersion{data[2:4]}, nil
}
// Code returns the option code.
func (o *OptVersion) Code() dhcpv4.OptionCode {
return OptionVersion
}
// ToBytes returns a serialized stream of bytes for this option.
func (o *OptVersion) ToBytes() []byte {
return append([]byte{byte(o.Code()), 2}, o.Version...)
}
// String returns a human-readable string for this option.
func (o *OptVersion) String() string {
return fmt.Sprintf("BSDP Version -> %v.%v", o.Version[0], o.Version[1])
}
// Length returns the length of the data portion of this option.
func (o *OptVersion) Length() int {
return 2
}
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