HADOOP-7668. Add a NetUtils method that can tell if an InetAddress belongs to local host. Contributed by Suresh Srinivas.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1176986 13f79535-47bb-0310-9956-ffa450edef68
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@ -19,6 +19,9 @@ Trunk (unreleased changes)
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HADOOP-7635. RetryInvocationHandler should release underlying resources on
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close (atm)
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HADOOP-7668. Add a NetUtils method that can tell if an InetAddress
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belongs to local host. (suresh)
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BUGS
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@ -516,4 +516,27 @@ public class NetUtils {
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} catch (UnknownHostException ignore) { }
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return addr;
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}
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/**
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* Given an InetAddress, checks to see if the address is a local address, by
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* comparing the address with all the interfaces on the node.
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* @param addr address to check if it is local node's address
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* @return true if the address corresponds to the local node
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*/
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public static boolean isLocalAddress(InetAddress addr) {
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// Check if the address is any local or loop back
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boolean local = addr.isAnyLocalAddress() || addr.isLoopbackAddress();
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System.out.println("address is any or loopback address " + addr);
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// Check if the address is defined on any interface
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if (!local) {
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try {
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local = NetworkInterface.getByInetAddress(addr) != null;
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} catch (SocketException e) {
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local = false;
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}
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}
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System.out.println("address " + addr + " is local " + local);
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return local;
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}
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}
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@ -18,13 +18,17 @@
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package org.apache.hadoop.net;
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import org.junit.Test;
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import static org.junit.Assert.*;
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import java.net.InetAddress;
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import java.net.NetworkInterface;
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import java.net.Socket;
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import java.net.ConnectException;
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import java.net.SocketException;
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import java.net.InetSocketAddress;
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import java.net.UnknownHostException;
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import java.util.Enumeration;
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import org.apache.hadoop.conf.Configuration;
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@ -88,4 +92,32 @@ public class TestNetUtils {
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fail("NetUtils.verifyHostnames threw unexpected UnknownHostException");
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}
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}
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/**
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* Test for {@link NetUtils#isLocalAddress(java.net.InetAddress)}
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*/
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@Test
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public void testIsLocalAddress() throws Exception {
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// Test - local host is local address
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assertTrue(NetUtils.isLocalAddress(InetAddress.getLocalHost()));
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// Test - all addresses bound network interface is local address
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Enumeration<NetworkInterface> interfaces = NetworkInterface
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.getNetworkInterfaces();
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if (interfaces != null) { // Iterate through all network interfaces
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while (interfaces.hasMoreElements()) {
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NetworkInterface i = interfaces.nextElement();
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Enumeration<InetAddress> addrs = i.getInetAddresses();
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if (addrs == null) {
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continue;
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}
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// Iterate through all the addresses of a network interface
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while (addrs.hasMoreElements()) {
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InetAddress addr = addrs.nextElement();
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assertTrue(NetUtils.isLocalAddress(addr));
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}
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}
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}
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assertFalse(NetUtils.isLocalAddress(InetAddress.getByName("8.8.8.8")));
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}
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}
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