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package dhcpv6
import (
"fmt"
"strings"
"github.com/u-root/uio/uio"
)
// OptVendorClass represents a DHCPv6 Vendor Class option
type OptVendorClass struct {
EnterpriseNumber uint32
Data [][]byte
}
// Code returns the option code
func (op *OptVendorClass) Code() OptionCode {
return OptionVendorClass
}
// ToBytes serializes the option and returns it as a sequence of bytes
func (op *OptVendorClass) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
buf.Write32(op.EnterpriseNumber)
for _, data := range op.Data {
buf.Write16(uint16(len(data)))
buf.WriteBytes(data)
}
return buf.Data()
}
// String returns a string representation of the VendorClass data
func (op *OptVendorClass) String() string {
vcStrings := make([]string, 0)
for _, data := range op.Data {
vcStrings = append(vcStrings, string(data))
}
return fmt.Sprintf("%s: {EnterpriseNumber=%d Data=[%s]}", op.Code(), op.EnterpriseNumber, strings.Join(vcStrings, ", "))
}
// FromBytes builds an OptVendorClass structure from a sequence of bytes. The
// input data does not include option code and length bytes.
func (op *OptVendorClass) FromBytes(data []byte) error {
buf := uio.NewBigEndianBuffer(data)
*op = OptVendorClass{}
op.EnterpriseNumber = buf.Read32()
for buf.Has(2) {
len := buf.Read16()
op.Data = append(op.Data, buf.CopyN(int(len)))
}
if len(op.Data) == 0 {
return fmt.Errorf("%w: vendor class data should not be empty", uio.ErrBufferTooShort)
}
return buf.FinError()
}
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