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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
}
// IdentityOptions implement the options allowed for IA_NA and IA_TA messages.
//
// The allowed options are identified in RFC 3315 Appendix B.
type IdentityOptions struct {
Options
}
// Addresses returns the addresses assigned to the identity.
func (io IdentityOptions) Addresses() []*OptIAAddress {
opts := io.Options.Get(OptionIAAddr)
var iaAddrs []*OptIAAddress
for _, o := range opts {
iaAddrs = append(iaAddrs, o.(*OptIAAddress))
}
return iaAddrs
}
// OneAddress returns one address (of potentially many) assigned to the identity.
func (io IdentityOptions) OneAddress() *OptIAAddress {
a := io.Addresses()
if len(a) == 0 {
return nil
}
return a[0]
}
// Status returns the status code associated with this option.
func (io IdentityOptions) Status() *OptStatusCode {
opt := io.Options.GetOne(OptionStatusCode)
if opt == nil {
return nil
}
sc, ok := opt.(*OptStatusCode)
if !ok {
return nil
}
return sc
}
// 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 IdentityOptions
}
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)
}
// 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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