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package dhcpv6
import (
"fmt"
"net"
"time"
"github.com/u-root/u-root/pkg/uio"
)
// OptIAPrefix implements the IAPrefix option.
//
// This module defines the OptIAPrefix structure.
// https://www.ietf.org/rfc/rfc3633.txt
type OptIAPrefix struct {
PreferredLifetime time.Duration
ValidLifetime time.Duration
prefixLength byte
ipv6Prefix net.IP
Options Options
}
func (op *OptIAPrefix) Code() OptionCode {
return OptionIAPrefix
}
// ToBytes marshals this option according to RFC 3633, Section 10.
func (op *OptIAPrefix) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
t1 := Duration{op.PreferredLifetime}
t1.Marshal(buf)
t2 := Duration{op.ValidLifetime}
t2.Marshal(buf)
buf.Write8(op.prefixLength)
prefix := op.ipv6Prefix.To16()
if prefix != nil {
buf.WriteBytes(prefix)
} else {
buf.WriteBytes(make([]byte, net.IPv6len))
}
buf.WriteBytes(op.Options.ToBytes())
return buf.Data()
}
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
}
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 op.Options.GetOne(code)
}
// DelOption will remove all the options that match a Option code.
func (op *OptIAPrefix) DelOption(code OptionCode) {
op.Options.Del(code)
}
// ParseOptIAPrefix 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) {
buf := uio.NewBigEndianBuffer(data)
var opt OptIAPrefix
var t1, t2 Duration
t1.Unmarshal(buf)
t2.Unmarshal(buf)
opt.PreferredLifetime = t1.Duration
opt.ValidLifetime = t2.Duration
opt.prefixLength = buf.Read8()
opt.ipv6Prefix = net.IP(buf.CopyN(net.IPv6len))
if err := opt.Options.FromBytes(buf.ReadAll()); err != nil {
return nil, err
}
return &opt, buf.FinError()
}
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