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package dhcpv6
// This module defines the OptDNSRecursiveNameServer structure.
// https://www.ietf.org/rfc/rfc3646.txt
import (
"encoding/binary"
"fmt"
"net"
)
type OptDNSRecursiveNameServer struct {
nameServers []net.IP
}
func (op *OptDNSRecursiveNameServer) Code() OptionCode {
return DNS_RECURSIVE_NAME_SERVER
}
func (op *OptDNSRecursiveNameServer) ToBytes() []byte {
buf := make([]byte, 4)
binary.BigEndian.PutUint16(buf[0:2], uint16(DNS_RECURSIVE_NAME_SERVER))
binary.BigEndian.PutUint16(buf[2:4], uint16(op.Length()))
for _, ns := range op.nameServers {
buf = append(buf, ns...)
}
return buf
}
func (op *OptDNSRecursiveNameServer) NameServers() []net.IP {
return op.nameServers
}
func (op *OptDNSRecursiveNameServer) SetNameServers(ns []net.IP) {
op.nameServers = ns
}
func (op *OptDNSRecursiveNameServer) Length() int {
return len(op.nameServers) * net.IPv6len
}
func (op *OptDNSRecursiveNameServer) String() string {
return fmt.Sprintf("OptDNSRecursiveNameServer{nameservers=%v}", op.nameServers)
}
// build an OptDNSRecursiveNameServer structure from a sequence of bytes.
// The input data does not include option code and length bytes.
func ParseOptDNSRecursiveNameServer(data []byte) (*OptDNSRecursiveNameServer, error) {
if len(data)%2 != 0 {
return nil, fmt.Errorf("Invalid OptDNSRecursiveNameServer data: length is not a multiple of 2")
}
opt := OptDNSRecursiveNameServer{}
var nameServers []net.IP
for i := 0; i < len(data); i += net.IPv6len {
nameServers = append(nameServers, data[i:i+net.IPv6len])
}
opt.nameServers = nameServers
return &opt, nil
}
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