org.squiddev.cctweaks.lua.lib.socket.AddressMatcher.java Source code

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Here is the source code for org.squiddev.cctweaks.lua.lib.socket.AddressMatcher.java

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/**
 * Copyright (c) 2013-2015 Florian "Sangar" Ncke
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.squiddev.cctweaks.lua.lib.socket;

import com.google.common.net.InetAddresses;
import org.squiddev.patcher.Logger;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Whitelist/blacklist for addresses
 */
public class AddressMatcher {
    private static final Pattern cidrPattern = Pattern
            .compile("(\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})(?:/(\\d{1,2}))");

    private final HashSet<String> hosts = new HashSet<String>();
    private final HashSet<InetAddress> addresses = new HashSet<InetAddress>();
    private final ArrayList<HostRange> ranges = new ArrayList<HostRange>();

    public final boolean active;

    private static class HostRange {
        private final int min;
        private final int max;

        private HostRange(int min, int max) {
            this.min = min;
            this.max = max;
        }
    }

    public AddressMatcher(String[] matches) {
        boolean active = false;
        for (String host : matches) {
            try {
                Matcher matcher = cidrPattern.matcher(host);
                if (matcher.matches()) {
                    String address = matcher.group(1), prefix = matcher.group(2);

                    int addr = InetAddresses.coerceToInteger(InetAddresses.forString(address));
                    int mask = 0xFFFFFFFF << (32 - Integer.parseInt(prefix));
                    int min = addr & mask;
                    int max = addr | ~mask;

                    active = true;
                    ranges.add(new HostRange(min, max));
                } else {
                    active = true;
                    hosts.add(host);
                    addresses.add(InetAddress.getByName(host));
                }
            } catch (Exception e) {
                Logger.error("Error adding " + host + " to blacklist/whitelist", e);
            }
        }

        this.active = active;
    }

    public boolean matches(InetAddress address, String host) {
        if (hosts.contains(host))
            return true;
        if (addresses.contains(address))
            return true;

        // Presume true for IPv6 addresses
        if (!(address instanceof Inet4Address))
            return true;

        int value = InetAddresses.coerceToInteger(address);
        for (HostRange range : ranges) {
            if (value >= range.min && value <= range.max)
                return true;
        }

        return false;
    }

    @Override
    public String toString() {
        return "AddressMatcher{" + "hosts=" + hosts + ", addresses=" + addresses + ", ranges=" + ranges
                + ", active=" + active + '}';
    }
}