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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package org.apache.tools.ant.taskdefs;
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import java.net.Inet4Address;
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import java.net.Inet6Address;
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import java.net.InetAddress;
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import java.net.NetworkInterface;
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import java.util.Arrays;
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import java.util.Enumeration;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import org.apache.tools.ant.BuildException;
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import org.apache.tools.ant.Project;
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import org.apache.tools.ant.Task;
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/**
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* Sets properties to the host provided, or localhost if no information is
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* provided. The default properties are NAME, FQDN, ADDR4, ADDR6;
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*
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* @since Ant 1.8
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* @ant.task category="utility"
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*/
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public class HostInfo extends Task {
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private static final String DEF_REM_ADDR6 = "::";
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private static final String DEF_REM_ADDR4 = "0.0.0.0";
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private static final String DEF_LOCAL_ADDR6 = "::1";
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private static final String DEF_LOCAL_ADDR4 = "127.0.0.1";
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private static final String DEF_LOCAL_NAME = "localhost";
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private static final String DEF_DOMAIN = "localdomain";
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private static final String DOMAIN = "DOMAIN";
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private static final String NAME = "NAME";
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private static final String ADDR4 = "ADDR4";
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private static final String ADDR6 = "ADDR6";
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private String prefix = "";
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private String host;
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private InetAddress nameAddr;
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private InetAddress best6;
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private InetAddress best4;
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private List inetAddrs;
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/**
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* Set a prefix for the properties. If the prefix does not end with a "."
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* one is automatically added.
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*
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* @param aPrefix
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* the prefix to use.
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* @since Ant 1.8
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*/
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public void setPrefix(String aPrefix) {
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prefix = aPrefix;
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if (!prefix.endsWith(".")) {
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prefix += ".";
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}
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}
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/**
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* Set the host to be retrieved.
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*
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* @param aHost
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* the name or the address of the host, data for the local host
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* will be retrieved if ommited.
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* @since Ant 1.8
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*/
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public void setHost(String aHost) {
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host = aHost;
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}
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/**
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* set the properties.
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*
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* @throws BuildException
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* on error.
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*/
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public void execute() throws BuildException {
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if (host == null || "".equals(host)) {
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executeLocal();
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} else {
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executeRemote();
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}
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}
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private void executeLocal() {
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try {
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Enumeration interfaces = NetworkInterface.getNetworkInterfaces();
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inetAddrs = new LinkedList();
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while (interfaces.hasMoreElements()) {
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NetworkInterface currentif = (NetworkInterface) interfaces
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.nextElement();
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Enumeration addrs = currentif.getInetAddresses();
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while (addrs.hasMoreElements())
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{
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inetAddrs.add(addrs.nextElement());
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}
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}
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selectAddresses();
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if (nameAddr != null) {
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setDomainAndName(nameAddr.getCanonicalHostName());
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} else {
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setProperty(DOMAIN, DEF_DOMAIN);
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setProperty(NAME, DEF_LOCAL_NAME);
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}
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if (best4 != null) {
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setProperty(ADDR4, best4.getHostAddress());
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} else {
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setProperty(ADDR4, DEF_LOCAL_ADDR4);
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}
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if (best6 != null) {
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setProperty(ADDR6, best6.getHostAddress());
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} else {
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setProperty(ADDR6, DEF_LOCAL_ADDR6);
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}
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} catch (Exception e) {
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log("Error retrieving local host information", e, Project.MSG_WARN);
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setProperty(DOMAIN, DEF_DOMAIN);
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setProperty(NAME, DEF_LOCAL_NAME);
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setProperty(ADDR4, DEF_LOCAL_ADDR4);
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setProperty(ADDR6, DEF_LOCAL_ADDR6);
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}
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}
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private void selectAddresses() {
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Iterator i = inetAddrs.iterator();
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while (i.hasNext()) {
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InetAddress current = (InetAddress) i.next();
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if (!current.isMulticastAddress()) {
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if (current instanceof Inet4Address) {
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best4 = selectBestAddress(best4, current);
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} else if (current instanceof Inet6Address) {
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best6 = selectBestAddress(best6, current);
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}
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}
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}
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nameAddr = selectBestAddress(best6, best4);
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}
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private InetAddress selectBestAddress(InetAddress bestSoFar,
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InetAddress current) {
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InetAddress best = bestSoFar;
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if (best == null) {
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// none selected so far, so this one is better.
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best = current;
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} else {
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if (current.isLoopbackAddress()) {
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// definitely not better than the previously selected address.
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} else if (current.isLinkLocalAddress()) {
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// link local considered better than loopback
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if (best.isLoopbackAddress()) {
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best = current;
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}
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} else if (current.isSiteLocalAddress()) {
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// site local considered better than link local (and loopback)
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if (best.isLoopbackAddress() || best.isLinkLocalAddress()) {
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best = current;
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}
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} else {
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// current is a global address, and therefore best (at least
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// equally well)
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best = current;
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}
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}
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return best;
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}
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private void executeRemote() {
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try {
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inetAddrs = Arrays.asList(InetAddress.getAllByName(host));
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selectAddresses();
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if (nameAddr != null) {
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setDomainAndName(nameAddr.getCanonicalHostName());
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} else {
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setDomainAndName(host);
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}
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if (best4 != null) {
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setProperty(ADDR4, best4.getHostAddress());
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} else {
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setProperty(ADDR4, DEF_REM_ADDR4);
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}
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if (best6 != null) {
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setProperty(ADDR6, best6.getHostAddress());
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} else {
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setProperty(ADDR6, DEF_REM_ADDR6);
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}
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} catch (Exception e) {
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log("Error retrieving remote host information for host:" + host
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+ ".", e, Project.MSG_WARN);
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setDomainAndName(host);
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setProperty(ADDR4, DEF_REM_ADDR4);
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setProperty(ADDR6, DEF_REM_ADDR6);
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}
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}
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private void setDomainAndName(String fqdn)
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{
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int idx = fqdn.indexOf('.');
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if (idx > 0) {
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setProperty(NAME, fqdn.substring(0, idx));
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setProperty(DOMAIN, fqdn.substring(idx+1));
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} else {
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setProperty(NAME, fqdn);
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setProperty(DOMAIN, DEF_DOMAIN);
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}
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}
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private void setProperty(String name, String value) {
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getProject().setNewProperty(prefix + name, value);
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}
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}
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Jacobus Martinus Kruithof