| /** |
| * |
| * Copyright 2004 The Apache Software Foundation |
| * |
| * Licensed 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 |
| * |
| * http://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 org.apache.activeio.xnet.hba; |
| |
| import java.util.regex.Pattern; |
| import java.util.regex.Matcher; |
| import java.net.InetAddress; |
| import java.net.Inet4Address; |
| |
| /** |
| * @version $Revision$ $Date$ |
| */ |
| public class NetmaskIPAddressPermission implements IPAddressPermission { |
| private static final Pattern MASK_VALIDATOR = Pattern.compile("^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})/((\\d{1,2})|(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3}))$"); |
| |
| public static boolean canSupport(String mask) { |
| Matcher matcher = MASK_VALIDATOR.matcher(mask); |
| return matcher.matches(); |
| } |
| |
| private final byte[] networkAddressBytes; |
| private final byte[] netmaskBytes; |
| |
| public NetmaskIPAddressPermission(String mask) { |
| Matcher matcher = MASK_VALIDATOR.matcher(mask); |
| if (false == matcher.matches()) { |
| throw new IllegalArgumentException("Mask " + mask + " does not match pattern " + MASK_VALIDATOR.pattern()); |
| } |
| |
| networkAddressBytes = new byte[4]; |
| for (int i = 0; i < 4; i++) { |
| String group = matcher.group(i + 1); |
| int value = Integer.parseInt(group); |
| if (value < 0 || 255 < value) { |
| throw new IllegalArgumentException("byte #" + i + " is not valid."); |
| } |
| networkAddressBytes[i] = (byte) value; |
| } |
| |
| netmaskBytes = new byte[4]; |
| String netmask = matcher.group(6); |
| if (null != netmask) { |
| int value = Integer.parseInt(netmask); |
| int pos = value / 8; |
| int shift = 8 - value % 8; |
| for (int i = 0; i < pos; i++) { |
| netmaskBytes[i] = (byte) 0xff; |
| } |
| netmaskBytes[pos] = (byte) (0xff << shift); |
| } else { |
| for (int i = 0; i < 4; i++) { |
| String group = matcher.group(i + 7); |
| int value = Integer.parseInt(group); |
| if (value < 0 || 255 < value) { |
| throw new IllegalArgumentException("byte #" + i + " is not valid."); |
| } |
| netmaskBytes[i] = (byte) value; |
| } |
| } |
| } |
| |
| public boolean implies(InetAddress address) { |
| if (false == address instanceof Inet4Address) { |
| return false; |
| } |
| |
| byte[] byteAddress = address.getAddress(); |
| for (int i = 0; i < 4; i++) { |
| if ((netmaskBytes[i] & byteAddress[i]) != networkAddressBytes[i]) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |