org.archive.util.InetAddressUtil Maven / Gradle / Ivy
/*
* This file is part of the Heritrix web crawler (crawler.archive.org).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA 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
*
* 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.archive.util;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* InetAddress utility.
* @author stack
* @version $Date$, $Revision$
*/
public class InetAddressUtil {
private static Logger logger =
Logger.getLogger(InetAddressUtil.class.getName());
/**
* ipv4 address.
*/
public static Pattern IPV4_QUADS = Pattern.compile(
"([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})");
private InetAddressUtil () {
super();
}
/**
* Returns InetAddress for passed host IF its in
* IPV4 quads format (e.g. 128.128.128.128).
* TODO: Move to an AddressParsingUtil class.
* @param host Host name to examine.
* @return InetAddress IF the passed name was an IP address, else null.
*/
public static InetAddress getIPHostAddress(String host) {
InetAddress result = null;
Matcher matcher = IPV4_QUADS.matcher(host);
if (matcher == null || !matcher.matches()) {
return result;
}
try {
// Doing an Inet.getByAddress() avoids a lookup.
result = InetAddress.getByAddress(host,
new byte[] {
(byte)(new Integer(matcher.group(1)).intValue()),
(byte)(new Integer(matcher.group(2)).intValue()),
(byte)(new Integer(matcher.group(3)).intValue()),
(byte)(new Integer(matcher.group(4)).intValue())});
} catch (NumberFormatException e) {
logger.warning(e.getMessage());
} catch (UnknownHostException e) {
logger.warning(e.getMessage());
}
return result;
}
/**
* @return All known local names for this host or null if none found.
*/
public static List getAllLocalHostNames() {
List localNames = new ArrayList();
Enumeration e = null;
try {
e = NetworkInterface.getNetworkInterfaces();
} catch(SocketException exception) {
throw new RuntimeException(exception);
}
for (; e.hasMoreElements();) {
for (Enumeration ee = e.nextElement().getInetAddresses();
ee.hasMoreElements();) {
InetAddress ia = ee.nextElement();
if (ia != null) {
if (ia.getHostName() != null) {
localNames.add(ia.getCanonicalHostName());
}
if (ia.getHostAddress() != null) {
localNames.add(ia.getHostAddress());
}
}
}
}
final String localhost = "localhost";
if (!localNames.contains(localhost)) {
localNames.add(localhost);
}
final String localhostLocaldomain = "localhost.localdomain";
if (!localNames.contains(localhostLocaldomain)) {
localNames.add(localhostLocaldomain);
}
return localNames;
}
}