IpSubnetFilterRule.java — netty Source File

Source Code

/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.ipfilter;

import io.netty.util.NetUtil;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.SocketUtils;

import java.math.BigInteger;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;

/**
 * Use this class to create rules for {@link RuleBasedIpFilter} that group IP addresses into subnets.
 * Supports both, IPv4 and IPv6.
 */
public final class IpSubnetFilterRule implements IpFilterRule, Comparable<IpSubnetFilterRule> {

    private final IpFilterRule filterRule;
    private final String ipAddress;

    /**
     * Create a new {@link IpSubnetFilterRule} instance
     *
     * @param ipAddressWithCidr IP Address with CIDR notation, e.g. (192.168.0.0/16) or (2001:db8::/32)
     * @param ruleType {@link IpFilterRuleType} to use
     */
    public IpSubnetFilterRule(String ipAddressWithCidr, IpFilterRuleType ruleType) {
        try {
            String[] ipAndCidr = ipAddressWithCidr.split("/");
            if (ipAndCidr.length != 2) {
                throw new IllegalArgumentException("ipAddressWithCidr: " + ipAddressWithCidr +
                        " (expected: \"<ip-address>/<mask-size>\")");
            }

            ipAddress = ipAndCidr[0];
            int cidrPrefix = Integer.parseInt(ipAndCidr[1]);
            filterRule = selectFilterRule(SocketUtils.addressByName(ipAddress), cidrPrefix, ruleType);
        } catch (UnknownHostException e) {
            throw new IllegalArgumentException("ipAddressWithCidr", e);
        }
    }

    /**
// ... (196 more lines)