1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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23 package test.java.net.InetAddress;
24 
25 /**
26  * @test
27  * @bug 8135305
28  * @key intermittent
29  * @summary ensure we can't ping external hosts via loopback if
30  */
31 
32 import java.io.*;
33 import java.net.*;
34 import java.util.*;
35 import org.testng.annotations.Test;
36 import static org.testng.Assert.fail;
37 
38 public class IsReachableViaLoopbackTest {
39     @Test
testReachableViaLoopback()40     public void testReachableViaLoopback() {
41         try {
42             InetAddress addr = InetAddress.getByName("localhost");
43             // Android-changed: use alternative DNS address (b/255943063#comment49)
44             // and switch to literal address to avoid DNS lookup flakes.
45             // InetAddress remoteAddr = InetAddress.getByName("bugs.openjdk.java.net");
46             InetAddress remoteAddr = InetAddress.getByAddress(new byte[]{8, 8, 8, 8});
47             if (!addr.isReachable(10000))
48                 fail("Localhost should always be reachable");
49             NetworkInterface inf = NetworkInterface.getByInetAddress(addr);
50             if (inf != null) {
51                 if (!addr.isReachable(inf, 20, 10000)) {
52                     fail("Localhost should always be reachable");
53                 } else {
54                 }
55                 if (remoteAddr.isReachable(inf, 20, 10000)) {
56                     fail(remoteAddr + " is reachable");
57                 } else {
58                 }
59             }
60 
61         } catch (IOException e) {
62            fail("Unexpected exception:" + e);
63         }
64     }
65 }