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package dhcpv6
// 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 net.IP
Options []Option
}
func (op *OptIAPrefix) Code() OptionCode {
return OptionIAPrefix
}
func (op *OptIAPrefix) ToBytes() []byte {
buf := make([]byte, 12)
binary.BigEndian.PutUint16(buf[0:2], uint16(OptionIAPrefix))
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...)
for _, opt := range op.Options {
buf = append(buf, opt.ToBytes()...)
}
return buf
}
func (op *OptIAPrefix) PrefixLength() byte {
return op.prefixLength
}
func (op *OptIAPrefix) SetPrefixLength(pl byte) {
op.prefixLength = pl
}
// IPv6Prefix returns the ipv6Prefix
func (op *OptIAPrefix) IPv6Prefix() net.IP {
return op.ipv6Prefix
}
// SetIPv6Prefix sets the ipv6Prefix
func (op *OptIAPrefix) SetIPv6Prefix(p net.IP) {
op.ipv6Prefix = p
}
// Length returns the option length
func (op *OptIAPrefix) Length() int {
opLen := 25
for _, opt := range op.Options {
opLen += 4 + opt.Length()
}
return opLen
}
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(), op.IPv6Prefix(), op.Options)
}
// GetOneOption will get an option of the give type from the Options field, if
// it is present. It will return `nil` otherwise
func (op *OptIAPrefix) GetOneOption(code OptionCode) Option {
return getOption(op.Options, code)
}
// DelOption will remove all the options that match a Option code.
func (op *OptIAPrefix) DelOption(code OptionCode) {
op.Options = delOption(op.Options, code)
}
// 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) {
var err error
opt := OptIAPrefix{}
if len(data) < 25 {
return nil, fmt.Errorf("Invalid IA for Prefix Delegation data length. Expected at least 25 bytes, got %v", len(data))
}
opt.PreferredLifetime = binary.BigEndian.Uint32(data[:4])
opt.ValidLifetime = binary.BigEndian.Uint32(data[4:8])
opt.prefixLength = data[8]
opt.ipv6Prefix = net.IP(data[9:25])
opt.Options, err = OptionsFromBytes(data[25:])
if err != nil {
return nil, err
}
return &opt, nil
}
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