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Copy pathMyTransformer.java
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56 lines (50 loc) · 2.15 KB
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import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtMethod;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.security.ProtectionDomain;
public class MyTransformer implements ClassFileTransformer {
public String HookPath;
public MyTransformer(String hookPath) {
HookPath = hookPath;
}
public static byte[] getFileBytes(String filename) throws Exception{
FileInputStream fileInputStream = new FileInputStream(new File(filename));
byte[] bytes = new byte[1024];
int read;
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
while ((read =fileInputStream.read(bytes))!=-1){
outputStream.write(bytes,0,read);
}
return outputStream.toByteArray();
}
@Override
public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
if (!className.equals("CrackLicenseTest")){
return null;
}else {
try {
ClassPool aDefault = ClassPool.getDefault();
byte[] bytes = getFileBytes("E:\\LicenceCrack\\target\\classes\\CrackLicenseTest.class");
CtClass ctClass = aDefault.makeClass(new ByteArrayInputStream(bytes));
CtMethod ctMethod = ctClass.getDeclaredMethod(
"checkExpiry", new CtClass[]{aDefault.getCtClass("java.lang.String")}
);
ctMethod.insertBefore("return false;");
ctMethod.insertBefore("System.out.println(\"License到期时间：\" + $1);");
bytes = ctClass.toBytecode();
return bytes;
} catch (Exception e) {
return null;
}
}
}
public static void main(String[] args) throws Exception{
getFileBytes("E:\\LicenceCrack\\target\\classes\\CrackLicenseTest.class");
}
}