nl.sidn.dnslib.util.IPUtil.java Source code

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Here is the source code for nl.sidn.dnslib.util.IPUtil.java

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/*
 * ENTRADA, a big data platform for network data analytics
 *
 * Copyright (C) 2016 SIDN [https://www.sidn.nl]
 * 
 * This file is part of ENTRADA.
 * 
 * ENTRADA is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * ENTRADA is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with ENTRADA.  If not, see [<http://www.gnu.org/licenses/].
 *
 */
package nl.sidn.dnslib.util;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;

import com.google.common.net.InetAddresses;

public class IPUtil {

    public static String reverseIpv6(String ipv6) {
        List<String> ipv6Parts = new ArrayList<>();
        String[] parts = StringUtils.split(ipv6, ":");
        int len = parts.length;
        for (int i = len - 1; i >= 0; i--) {
            String part = parts[i];

            for (int j = 3; j >= 0; j--) {

                String octet = part.substring(j, j + 1);
                ipv6Parts.add((String) octet);
            }
        }

        return StringUtils.join(ipv6Parts, ".") + ".ip6.arpa.";
    }

    public static String reverseIpv4(String ipv4) {
        List<String> ipv4Parts = new ArrayList<>();
        String[] parts = StringUtils.split(ipv4, ".");
        int len = parts.length;
        for (int i = len - 1; i >= 0; i--) {
            String part = parts[i];

            ipv4Parts.add(part);
        }

        return StringUtils.join(ipv4Parts, ".") + ".in-addr.arpa.";
    }

    public static String expandIPv6(String ip) {
        String[] sections = StringUtils.splitByWholeSeparatorPreserveAllTokens(ip, ":");
        StringBuilder sb = new StringBuilder();
        for (String section : sections) {
            if (section.length() == 0) {
                int missing = (8 - sections.length) + 1;
                for (int i = 0; i < missing; i++) {
                    sb.append("0000:");
                }
            } else if (section.length() < 4) {
                String paddedSection = StringUtils.leftPad(section, 4, "0");
                sb.append(paddedSection + ":");
            } else {
                sb.append(section + ":");
            }
        }
        String expanded = sb.toString();
        return StringUtils.removeEnd(expanded, ":");
    }

    public static byte[] ipv4tobytes(String ip) {
        String[] parts = StringUtils.split(ip, ".");
        byte[] bytes = new byte[4];
        for (int i = 0; i < parts.length; i++) {
            bytes[i] = (byte) Integer.parseInt(parts[i]);
        }

        return bytes;
    }

    public static byte[] ipv6tobytes(String ip) {
        int parts = StringUtils.countMatches(ip, ":");
        int missing = 7 - parts;

        for (int i = 0; i < missing; i++) {
            ip = ip + ":0000";
        }

        return InetAddresses.forString(ip).getAddress();
    }

}