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package dhcpv6
import (
"fmt"
"net"
"github.com/u-root/u-root/pkg/uio"
)
// OptIAAddress represents an OptionIAAddr.
//
// This module defines the OptIAAddress structure.
// https://www.ietf.org/rfc/rfc3633.txt
type OptIAAddress struct {
IPv6Addr net.IP
PreferredLifetime uint32
ValidLifetime uint32
Options Options
}
// Code returns the option's code
func (op *OptIAAddress) Code() OptionCode {
return OptionIAAddr
}
// ToBytes serializes the option and returns it as a sequence of bytes
func (op *OptIAAddress) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(make([]byte, 0, 28))
buf.Write16(uint16(OptionIAAddr))
buf.Write16(uint16(op.Length()))
buf.WriteBytes(op.IPv6Addr.To16())
buf.Write32(op.PreferredLifetime)
buf.Write32(op.ValidLifetime)
buf.WriteBytes(op.Options.ToBytes())
return buf.Data()
}
// Length returns the option length
func (op *OptIAAddress) Length() int {
opLen := 24
for _, opt := range op.Options {
opLen += 4 + opt.Length()
}
return opLen
}
func (op *OptIAAddress) String() string {
return fmt.Sprintf("OptIAAddress{ipv6addr=%v, preferredlifetime=%v, validlifetime=%v, options=%v}",
op.IPv6Addr, op.PreferredLifetime, op.ValidLifetime, op.Options)
}
// ParseOptIAAddress builds an OptIAAddress structure from a sequence
// of bytes. The input data does not include option code and length
// bytes.
func ParseOptIAAddress(data []byte) (*OptIAAddress, error) {
var opt OptIAAddress
buf := uio.NewBigEndianBuffer(data)
opt.IPv6Addr = net.IP(buf.CopyN(net.IPv6len))
opt.PreferredLifetime = buf.Read32()
opt.ValidLifetime = buf.Read32()
if err := opt.Options.FromBytes(buf.ReadAll()); err != nil {
return nil, err
}
return &opt, buf.FinError()
}
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