mirror of https://github.com/M66B/NetGuard.git
Added IP utilities
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package eu.faircode.netguard;
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/*
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This file is part of NetGuard.
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NetGuard is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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NetGuard is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with NetGuard. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2015-2016 by Marcel Bokhorst (M66B)
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*/
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import android.util.Log;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.util.ArrayList;
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import java.util.List;
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public class IPUtil {
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private static final String TAG = "NetGuard.IPUtil";
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public static List<CIDR> toCIDR(String start, String end) throws UnknownHostException {
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return toCIDR(InetAddress.getByName(start), InetAddress.getByName(end));
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}
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public static List<CIDR> toCIDR(InetAddress start, InetAddress end) throws UnknownHostException {
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List<CIDR> listResult = new ArrayList<>();
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Log.i(TAG, "toCIDR(" + start.getHostAddress() + "," + end.getHostAddress() + ")");
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long from = inet2long(start);
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long to = inet2long(end);
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while (to >= from) {
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byte prefix = 32;
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while (prefix > 0) {
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long mask = (0xFFFFFFFF00000000L >> (prefix - 1)) % 0x0100000000L;
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if ((from & mask) != from)
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break;
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prefix--;
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}
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byte max = (byte) (32 - Math.floor(Math.log(to - from + 1) / Math.log(2)));
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if (prefix < max)
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prefix = max;
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listResult.add(new CIDR(long2inet(from), prefix));
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from += Math.pow(2, (32 - prefix));
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}
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for (CIDR cidr : listResult)
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Log.i(TAG, cidr.toString());
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return listResult;
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}
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private static long inet2long(InetAddress addr) {
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long result = 0;
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for (byte b : addr.getAddress())
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result = result << 8 | (b & 0xFF);
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return result;
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}
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private static InetAddress long2inet(long addr) throws UnknownHostException {
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byte[] b = new byte[4];
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for (int i = b.length - 1; i >= 0; i--) {
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b[i] = (byte) (addr & 0xFF);
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addr = addr >> 8;
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}
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return InetAddress.getByAddress(b);
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}
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public static String minus1(String addr) throws UnknownHostException {
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return long2inet(inet2long(InetAddress.getByName(addr)) - 1).getHostAddress();
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}
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public static class CIDR {
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public InetAddress address;
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public int prefix;
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public CIDR(InetAddress address, int prefix) {
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this.address = address;
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this.prefix = prefix;
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}
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@Override
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public String toString() {
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return address.getHostAddress() + "/" + prefix;
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}
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}
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}
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