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package dhcpv6
// This module defines the OptRequestedOption structure.
// https://www.ietf.org/rfc/rfc3315.txt
import (
"encoding/binary"
"fmt"
)
type OptRequestedOption struct {
requestedOptions []OptionCode
}
func (op *OptRequestedOption) Code() OptionCode {
return OptionORO
}
func (op *OptRequestedOption) ToBytes() []byte {
buf := make([]byte, 4)
roBytes := make([]byte, 2)
binary.BigEndian.PutUint16(buf[0:2], uint16(OptionORO))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
for _, ro := range op.requestedOptions {
binary.BigEndian.PutUint16(roBytes, uint16(ro))
buf = append(buf, roBytes...)
}
return buf
}
func (op *OptRequestedOption) RequestedOptions() []OptionCode {
return op.requestedOptions
}
func (op *OptRequestedOption) SetRequestedOptions(opts []OptionCode) {
op.requestedOptions = opts
}
func (op *OptRequestedOption) AddRequestedOption(opt OptionCode) {
for _, requestedOption := range op.requestedOptions {
if opt == requestedOption {
fmt.Printf("Warning: option %s is already set, appending duplicate", OptionCodeToString[opt])
}
}
op.requestedOptions = append(op.requestedOptions, opt)
}
func (op *OptRequestedOption) Length() int {
return len(op.requestedOptions) * 2
}
func (op *OptRequestedOption) String() string {
roString := "["
for idx, code := range op.requestedOptions {
if name, ok := OptionCodeToString[OptionCode(code)]; ok {
roString += name
} else {
roString += "Unknown"
}
if idx < len(op.requestedOptions)-1 {
roString += ", "
}
}
roString += "]"
return fmt.Sprintf("OptRequestedOption{options=%v}", roString)
}
// build an OptRequestedOption structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func ParseOptRequestedOption(data []byte) (*OptRequestedOption, error) {
if len(data)%2 != 0 {
return nil, fmt.Errorf("Invalid OptRequestedOption data: length is not a multiple of 2")
}
opt := OptRequestedOption{}
var rOpts []OptionCode
for i := 0; i < len(data); i += 2 {
rOpts = append(rOpts, OptionCode(binary.BigEndian.Uint16(data[i:i+2])))
}
opt.requestedOptions = rOpts
return &opt, nil
}
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