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/*
* Copyright (c) 2015, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
/**
* @test
* @bug 8135305
* @key intermittent
* @library /test/lib
* @summary ensure we can't ping external hosts via loopback if
* @run main IsReachableViaLoopbackTest
*/
public class IsReachableViaLoopbackTest {
public static void main(String[] args) {
try {
InetAddress addr = InetAddress.getLoopbackAddress();
InetAddress remoteAddr = InetAddress.getByName("23.197.138.208"); // use literal address to avoid DNS checks
if (!addr.isReachable(10000))
throw new RuntimeException("Localhost should always be reachable");
NetworkInterface inf = NetworkInterface.getByInetAddress(addr);
if (inf != null) {
if (!addr.isReachable(inf, 20, 10000)) {
throw new RuntimeException("Localhost should always be reachable");
} else {
System.out.println(addr + " is reachable");
}
if (remoteAddr.isReachable(inf, 20, 10000)) {
throw new RuntimeException(remoteAddr + " is reachable");
} else {
System.out.println(remoteAddr + " is NOT reachable");
}
} else {
System.out.println("inf == null");
}
} catch (IOException e) {
throw new RuntimeException("Unexpected exception:" + e);
}
System.out.println("IsReachableViaLoopbackTest EXIT");
}
}
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