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package dhcpv6
import (
"fmt"
"net"
"github.com/u-root/u-root/pkg/uio"
)
// OptDNS returns a DNS Recursive Name Server option as defined by RFC 3646.
func OptDNS(ip ...net.IP) Option {
return &optDNS{NameServers: ip}
}
type optDNS struct {
NameServers []net.IP
}
// Code returns the option code
func (op *optDNS) Code() OptionCode {
return OptionDNSRecursiveNameServer
}
// ToBytes returns the option serialized to bytes.
func (op *optDNS) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
for _, ns := range op.NameServers {
buf.WriteBytes(ns.To16())
}
return buf.Data()
}
func (op *optDNS) String() string {
return fmt.Sprintf("DNS: %v", op.NameServers)
}
// parseOptDNS builds an optDNS structure
// from a sequence of bytes. The input data does not include option code and length
// bytes.
func parseOptDNS(data []byte) (*optDNS, error) {
var opt optDNS
buf := uio.NewBigEndianBuffer(data)
for buf.Has(net.IPv6len) {
opt.NameServers = append(opt.NameServers, buf.CopyN(net.IPv6len))
}
return &opt, buf.FinError()
}
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