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package dhcpv6
// This module defines the OptIAAddress structure.
// https://www.ietf.org/rfc/rfc3633.txt
import (
"encoding/binary"
"fmt"
"net"
)
// OptIAAddress represents an OPTION_IAADDR
type OptIAAddress struct {
IPv6Addr net.IP
PreferredLifetime uint32
ValidLifetime uint32
Options []Option
}
// Code returns the option's code
func (op *OptIAAddress) Code() OptionCode {
return OPTION_IAADDR
}
// ToBytes serializes the option and returns it as a sequence of bytes
func (op *OptIAAddress) ToBytes() []byte {
buf := make([]byte, 28)
binary.BigEndian.PutUint16(buf[0:2], uint16(OPTION_IAADDR))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
copy(buf[4:20], op.IPv6Addr[:])
binary.BigEndian.PutUint32(buf[20:24], op.PreferredLifetime)
binary.BigEndian.PutUint32(buf[24:28], op.ValidLifetime)
for _, opt := range op.Options {
buf = append(buf, opt.ToBytes()...)
}
return buf
}
// 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}",
net.IP(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 err error
opt := OptIAAddress{}
if len(data) < 24 {
return nil, fmt.Errorf("Invalid IA Address data length. Expected at least 24 bytes, got %v", len(data))
}
opt.IPv6Addr = net.IP(data[:16])
opt.PreferredLifetime = binary.BigEndian.Uint32(data[16:20])
opt.ValidLifetime = binary.BigEndian.Uint32(data[20:24])
opt.Options, err = OptionsFromBytes(data[24:])
if err != nil {
return nil, err
}
return &opt, nil
}
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