1 /*
   2  * Copyright (c) 2018, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jfr.event.io;
  27 
  28 import java.io.File;
  29 import java.io.FileInputStream;
  30 import java.io.FileOutputStream;
  31 import java.io.IOException;
  32 import java.io.InputStream;
  33 import java.io.OutputStream;
  34 import java.io.RandomAccessFile;
  35 import java.lang.instrument.ClassFileTransformer;
  36 import java.lang.instrument.Instrumentation;
  37 import java.net.ServerSocket;
  38 import java.net.Socket;
  39 import java.security.ProtectionDomain;
  40 import java.util.concurrent.CountDownLatch;
  41 
  42 
  43 /**
  44  * @test
  45  * @key jfr
  46  * @summary This test runs JFR with a javaagent that reads/writes files and
  47  * sockets during every class definition. This is to verify that the i/o
  48  * instrumentation in JFR does not interfere with javaagents.
  49  *
  50  *
  51  * @library /lib /
  52  *
  53  *
  54  * @run shell MakeJAR.sh EvilInstrument 'Can-Redefine-Classes: true'
  55  * @run main/othervm -javaagent:EvilInstrument.jar jdk.jfr.event.io.EvilInstrument
  56  */
  57 
  58 public class EvilInstrument {
  59 
  60     CountDownLatch socketEchoReady = new CountDownLatch(1);
  61     ServerSocket ss;
  62 
  63     /**
  64      * Thread that echos everything from a socket.
  65      */
  66     class SocketEcho extends Thread
  67     {
  68         public SocketEcho() {
  69             setDaemon(true);
  70         }
  71 
  72         public void run() {
  73             try {
  74                 Socket s = ss.accept();
  75                 OutputStream os = s.getOutputStream();
  76                 InputStream is = s.getInputStream();
  77                 socketEchoReady.countDown();
  78                 for(;;) {
  79                     int b = is.read();
  80                     os.write(b);
  81                 }
  82             } catch(Exception ex) {
  83                 ex.printStackTrace();
  84                 System.exit(1);
  85             }
  86         }
  87     }
  88 
  89     public static File createScratchFile() throws IOException {
  90         return File.createTempFile("EvilTransformer", null, new File(".")).getAbsoluteFile();
  91     }
  92 
  93     class EvilTransformer implements ClassFileTransformer {
  94         File scratch;
  95         Socket s;
  96         volatile boolean inited = false;
  97 
  98         public EvilTransformer() throws Exception {
  99             scratch = createScratchFile();
 100             ss = new ServerSocket(0);
 101             new SocketEcho().start();
 102             s = new Socket(ss.getInetAddress(), ss.getLocalPort());
 103             socketEchoReady.await();
 104             inited = true;
 105         }
 106 
 107         public byte[] transform(ClassLoader loader, String className,
 108                                 Class<?> classBeingRedefined,
 109                                 ProtectionDomain protectionDomain,
 110                                 byte[] classfileBuffer)
 111         {
 112             if (!inited) {
 113                 return null;
 114             }
 115             // Do i/o operations during every transform call.
 116             try {
 117                 FileOutputStream fos = new FileOutputStream(scratch);
 118                 fos.write(31);
 119                 fos.close();
 120 
 121                 FileInputStream fis = new FileInputStream(scratch);
 122                 fis.read();
 123                 fis.close();
 124 
 125                 RandomAccessFile raf = new RandomAccessFile(scratch, "rw");
 126                 raf.read();
 127                 raf.write(31);
 128                 raf.close();
 129 
 130                 s.getOutputStream().write(31);
 131                 s.getInputStream().read();
 132 
 133             } catch(Exception ex) {
 134                 ex.printStackTrace();
 135                 System.exit(1);
 136             }
 137             return null;
 138         }
 139     }
 140 
 141     public static void premain(String agentArgs, Instrumentation inst) {
 142         new EvilInstrument().addTransformer(inst);
 143     }
 144 
 145     private void addTransformer(Instrumentation inst) {
 146         try {
 147             inst.addTransformer(new EvilTransformer());
 148         } catch(Exception ex) {
 149             ex.printStackTrace();
 150             System.exit(1);
 151         }
 152     }
 153 
 154     public static void main(String... args) throws Exception {
 155         System.out.println("Hello");
 156     }
 157 
 158 }