package com.frw.tangerino.web.ws;

import java.net.InetAddress;
import java.net.UnknownHostException;

import org.xbill.DNS.*;

/*
<dependency>
    <groupId>dnsjava</groupId>
    <artifactId>dnsjava</artifactId>
    <version>2.1.8</version>
</dependency>
*/

public class UsingDNS {

    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getLocalHost();
            System.out.println("LOCAL ADDRESS : " + address.getHostAddress());
            System.out.println("LOCAL HOST : " + address.getHostName());

            InetAddress ipAddress = java.net.InetAddress.getByName("api.tangerino.com.br");
            String ip = ipAddress.getHostAddress();
            System.out.println("API IP : " + ip);

            final InetAddress ip2 = InetAddress.getByName("52.67.84.7");
            final byte[] bytes = ip2.getAddress();
            final String host = getHostByIPAddress(bytes);
            System.out.println("API HOST : " + host);

        } catch (UnknownHostException e) {
            System.out.println("Host NOT Avaialble");
        }

    }

    public static String getHostByIPAddress(byte[] addr) throws UnknownHostException {

        Name name = ReverseMap.fromAddress(InetAddress.getByAddress(addr));

        // OPEN DNS SERVERS
        //final String[] openDNS = new String[] {"208.67.222.222", "208.67.220.220"};

        // GOOGLE DNS SERVERS
        final String[] openDNS = new String[] {"8.8.8.8", "8.8.4.4"};

        final Resolver resolver = new ExtendedResolver(openDNS);
        final Lookup lookUp = new Lookup(name, Type.PTR);
        lookUp.setResolver(resolver);
        Record[] records = lookUp.run();
        if (records == null) {
            throw new UnknownHostException();
        }
        return ((PTRRecord) records[0]).getTarget().toString();
    }
}