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package options
// This module defines the OptIAPrefix structure.
// https://www.ietf.org/rfc/rfc3633.txt
import (
"encoding/binary"
"fmt"
"net"
)
type OptIAPrefix struct {
preferredLifetime uint32
validLifetime uint32
prefixLength byte
ipv6Prefix [16]byte
options []byte
}
func (op *OptIAPrefix) Code() OptionCode {
return OPTION_IAPREFIX
}
func (op *OptIAPrefix) ToBytes() []byte {
buf := make([]byte, 25)
binary.BigEndian.PutUint16(buf[0:2], uint16(OPTION_IAPREFIX))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
binary.BigEndian.PutUint32(buf[4:8], op.preferredLifetime)
binary.BigEndian.PutUint32(buf[8:12], op.validLifetime)
buf = append(buf, op.prefixLength)
buf = append(buf, op.ipv6Prefix[:]...)
buf = append(buf, op.options...)
return buf
}
func (op *OptIAPrefix) PreferredLifetime() uint32 {
return op.preferredLifetime
}
func (op *OptIAPrefix) SetPreferredLifetime(pl uint32) {
op.preferredLifetime = pl
}
func (op *OptIAPrefix) ValidLifetime() uint32 {
return op.validLifetime
}
func (op *OptIAPrefix) SetValidLifetime(vl uint32) {
op.validLifetime = vl
}
func (op *OptIAPrefix) PrefixLength() byte {
return op.prefixLength
}
func (op *OptIAPrefix) SetPrefixLength(pl byte) {
op.prefixLength = pl
}
func (op *OptIAPrefix) IPv6Prefix() []byte {
return op.ipv6Prefix[:]
}
func (op *OptIAPrefix) SetIPv6Prefix(p [16]byte) {
op.ipv6Prefix = p
}
func (op *OptIAPrefix) Options() []byte {
return op.options
}
func (op *OptIAPrefix) SetOptions(options []byte) {
op.options = options
}
func (op *OptIAPrefix) Length() int {
return 25 + len(op.options)
}
func (op *OptIAPrefix) String() string {
return fmt.Sprintf("OptIAPrefix{preferredlifetime=%v, validlifetime=%v, prefixlength=%v, ipv6prefix=%v, options=%v}",
op.preferredLifetime, op.validLifetime, op.prefixLength, net.IP(op.ipv6Prefix[:]), op.options)
}
// build an OptIAPrefix structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func ParseOptIAPrefix(data []byte) (*OptIAPrefix, error) {
opt := OptIAPrefix{}
if len(data) < 12 {
return nil, fmt.Errorf("Invalid IA for Prefix Delegation data length. Expected at least 12 bytes, got %v", len(data))
}
opt.preferredLifetime = binary.BigEndian.Uint32(data[:4])
opt.validLifetime = binary.BigEndian.Uint32(data[4:8])
opt.prefixLength = data[9]
copy(opt.ipv6Prefix[:], data[9:17])
copy(opt.options, data[17:])
return &opt, nil
}
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