| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.hadoop.net; |
| |
| import org.junit.Test; |
| import static org.junit.Assert.*; |
| |
| import java.net.Socket; |
| import java.net.ConnectException; |
| import java.net.InetSocketAddress; |
| import org.apache.hadoop.conf.Configuration; |
| |
| public class TestNetUtils { |
| |
| /** |
| * Test that we can't accidentally connect back to the connecting socket due |
| * to a quirk in the TCP spec. |
| * |
| * This is a regression test for HADOOP-6722. |
| */ |
| @Test |
| public void testAvoidLoopbackTcpSockets() throws Exception { |
| Configuration conf = new Configuration(); |
| |
| Socket socket = NetUtils.getDefaultSocketFactory(conf) |
| .createSocket(); |
| socket.bind(new InetSocketAddress("127.0.0.1", 0)); |
| System.err.println("local address: " + socket.getLocalAddress()); |
| System.err.println("local port: " + socket.getLocalPort()); |
| try { |
| NetUtils.connect(socket, |
| new InetSocketAddress(socket.getLocalAddress(), socket.getLocalPort()), |
| 20000); |
| socket.close(); |
| fail("Should not have connected"); |
| } catch (ConnectException ce) { |
| System.err.println("Got exception: " + ce); |
| assertTrue(ce.getMessage().contains("resulted in a loopback")); |
| } |
| } |
| } |