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package dhcpv6
import (
"fmt"
"time"
"github.com/u-root/u-root/pkg/uio"
)
// Duration is a duration as embedded in IA messages (IAPD, IANA, IATA).
type Duration struct {
time.Duration
}
// Marshal encodes the time in uint32 seconds as defined by RFC 3315 for IANA
// messages.
func (d Duration) Marshal(buf *uio.Lexer) {
buf.Write32(uint32(d.Duration.Round(time.Second) / time.Second))
}
// Unmarshal decodes time from uint32 seconds as defined by RFC 3315 for IANA
// messages.
func (d *Duration) Unmarshal(buf *uio.Lexer) {
t := buf.Read32()
d.Duration = time.Duration(t) * time.Second
}
// OptIANA implements the identity association for non-temporary addresses
// option.
//
// This module defines the OptIANA structure.
// https://www.ietf.org/rfc/rfc3633.txt
type OptIANA struct {
IaId [4]byte
T1 time.Duration
T2 time.Duration
Options Options
}
func (op *OptIANA) Code() OptionCode {
return OptionIANA
}
// ToBytes serializes IANA to DHCPv6 bytes.
func (op *OptIANA) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
buf.WriteBytes(op.IaId[:])
t1 := Duration{op.T1}
t1.Marshal(buf)
t2 := Duration{op.T2}
t2.Marshal(buf)
buf.WriteBytes(op.Options.ToBytes())
return buf.Data()
}
func (op *OptIANA) String() string {
return fmt.Sprintf("IANA: {IAID=%v, t1=%v, t2=%v, options=%v}",
op.IaId, op.T1, op.T2, op.Options)
}
// AddOption adds an option at the end of the IA_NA options
func (op *OptIANA) AddOption(opt Option) {
op.Options.Add(opt)
}
// GetOneOption will get an option of the give type from the Options field, if
// it is present. It will return `nil` otherwise
func (op *OptIANA) GetOneOption(code OptionCode) Option {
return op.Options.GetOne(code)
}
// DelOption will remove all the options that match a Option code.
func (op *OptIANA) DelOption(code OptionCode) {
op.Options.Del(code)
}
// ParseOptIANA builds an OptIANA structure from a sequence of bytes. The
// input data does not include option code and length bytes.
func ParseOptIANA(data []byte) (*OptIANA, error) {
var opt OptIANA
buf := uio.NewBigEndianBuffer(data)
buf.ReadBytes(opt.IaId[:])
var t1, t2 Duration
t1.Unmarshal(buf)
t2.Unmarshal(buf)
opt.T1 = t1.Duration
opt.T2 = t2.Duration
if err := opt.Options.FromBytes(buf.ReadAll()); err != nil {
return nil, err
}
return &opt, buf.FinError()
}
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