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package dhcpv4
import (
"bytes"
"fmt"
"github.com/u-root/uio/uio"
)
// VIVCIdentifier implements the vendor-identifying vendor class option
// described by RFC 3925.
type VIVCIdentifier struct {
// EntID is the enterprise ID.
EntID uint32
Data []byte
}
// OptVIVC returns a new vendor-identifying vendor class option.
//
// The option is described by RFC 3925.
func OptVIVC(identifiers ...VIVCIdentifier) Option {
return Option{
Code: OptionVendorIdentifyingVendorClass,
Value: VIVCIdentifiers(identifiers),
}
}
// VIVCIdentifiers implements encoding and decoding methods for a DHCP option
// described in RFC 3925.
type VIVCIdentifiers []VIVCIdentifier
// FromBytes parses data into ids per RFC 3925.
func (ids *VIVCIdentifiers) FromBytes(data []byte) error {
buf := uio.NewBigEndianBuffer(data)
for buf.Has(5) {
entID := buf.Read32()
idLen := int(buf.Read8())
*ids = append(*ids, VIVCIdentifier{EntID: entID, Data: buf.CopyN(idLen)})
}
return buf.FinError()
}
// ToBytes returns a serialized stream of bytes for this option.
func (ids VIVCIdentifiers) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
for _, id := range ids {
buf.Write32(id.EntID)
buf.Write8(uint8(len(id.Data)))
buf.WriteBytes(id.Data)
}
return buf.Data()
}
// String returns a human-readable string for this option.
func (ids VIVCIdentifiers) String() string {
if len(ids) == 0 {
return ""
}
buf := bytes.Buffer{}
for _, id := range ids {
fmt.Fprintf(&buf, " %d:'%s',", id.EntID, id.Data)
}
return buf.String()[1 : buf.Len()-1]
}
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