1 /* 2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* @test 25 * @bug 4531526 26 * @summary Test that more than one debuggee cannot bind to same port 27 * at the same time. 28 * 29 * @library /lib/testlibrary 30 * @modules java.management 31 * jdk.jdi 32 * 33 * @build jdk.testlibrary.* VMConnection ExclusiveBind HelloWorld 34 * @run driver ExclusiveBind 35 */ 36 import java.net.ServerSocket; 37 import com.sun.jdi.Bootstrap; 38 import com.sun.jdi.VirtualMachine; 39 import com.sun.jdi.connect.Connector; 40 import com.sun.jdi.connect.AttachingConnector; 41 42 import java.util.ArrayList; 43 import java.util.Map; 44 import java.util.List; 45 import java.util.Iterator; 46 import java.util.concurrent.TimeUnit; 47 48 import jdk.testlibrary.ProcessTools; 49 import jdk.testlibrary.Utils; 50 51 public class ExclusiveBind { 52 /* 53 * Find a connector by name 54 */ 55 private static Connector findConnector(String name) { 56 List connectors = Bootstrap.virtualMachineManager().allConnectors(); 57 Iterator iter = connectors.iterator(); 58 while (iter.hasNext()) { 59 Connector connector = (Connector)iter.next(); 60 if (connector.name().equals(name)) { 61 return connector; 62 } 63 } 64 return null; 65 } 66 67 /* 68 * Launch (in server mode) a debuggee with the given address and 69 * suspend mode. 70 */ 71 private static ProcessBuilder prepareLauncher(String address, boolean suspend, String class_name) throws Exception { 72 List<String> args = new ArrayList<>(); 73 for(String dbgOption : VMConnection.getDebuggeeVMOptions().split(" ")) { 74 if (!dbgOption.trim().isEmpty()) { 75 args.add(dbgOption); 76 } 77 } 78 String lib = "-agentlib:jdwp=transport=dt_socket,server=y,suspend="; 79 if (suspend) { 80 lib += "y"; 81 } else { 82 lib += "n"; 83 } 84 lib += ",address=" + address; 85 86 args.add(lib); 87 args.add(class_name); 88 89 return ProcessTools.createJavaProcessBuilder(args.toArray(new String[args.size()])); 90 } 91 92 /* 93 * - pick a TCP port 94 * - Launch a debuggee in server=y,suspend=y,address=${port} 95 * - Launch a second debuggee in server=y,suspend=n with the same port 96 * - Second debuggee should fail with an error (address already in use) 97 * - For clean-up we attach to the first debuggee and resume it. 98 */ 99 public static void main(String args[]) throws Exception { 100 // find a free port 101 ServerSocket ss = new ServerSocket(0); 102 int port = ss.getLocalPort(); 103 ss.close(); 104 105 String address = String.valueOf(port); 106 107 // launch the first debuggee 108 ProcessBuilder process1 = prepareLauncher(address, true, "HelloWorld"); 109 // start the debuggee and wait for the "ready" message 110 Process p = ProcessTools.startProcess( 111 "process1", 112 process1, 113 line -> line.equals("Listening for transport dt_socket at address: " + address), 114 Utils.adjustTimeout(5000), 115 TimeUnit.MILLISECONDS 116 ); 117 118 // launch a second debuggee with the same address 119 ProcessBuilder process2 = prepareLauncher(address, false, "HelloWorld"); 120 121 // get exit status from second debuggee 122 int exitCode = ProcessTools.startProcess("process2", process2).waitFor(); 123 124 // clean-up - attach to first debuggee and resume it 125 AttachingConnector conn = (AttachingConnector)findConnector("com.sun.jdi.SocketAttach"); 126 Map conn_args = conn.defaultArguments(); 127 Connector.IntegerArgument port_arg = 128 (Connector.IntegerArgument)conn_args.get("port"); 129 port_arg.setValue(port); 130 VirtualMachine vm = conn.attach(conn_args); 131 vm.resume(); 132 133 // if the second debuggee ran to completion then we've got a problem 134 if (exitCode == 0) { 135 throw new RuntimeException("Test failed - second debuggee didn't fail to bind"); 136 } else { 137 System.out.println("Test passed - second debuggee correctly failed to bind"); 138 } 139 } 140 }