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/**
* Copyright (C) 2010-2016 Gordon Fraser, Andrea Arcuri and EvoSuite
* contributors
*
* This file is part of EvoSuite.
*
* EvoSuite is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3.0 of the License, or
* (at your option) any later version.
*
* EvoSuite is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with EvoSuite. If not, see .
*/
package org.evosuite.runtime.agent;
import java.io.File;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import java.lang.reflect.Method;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.jar.Attributes;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import org.evosuite.runtime.util.JarPathing;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class is responsible to load the jar with the agent
* definition (in its manifest) and then hook it to the current
* running JVM
*
* @author arcuri
*
*/
public class AgentLoader {
private static final Logger logger = LoggerFactory.getLogger(AgentLoader.class);
private static volatile boolean alreadyLoaded = false;
public synchronized static void loadAgent() throws RuntimeException{
if(alreadyLoaded){
return;
}
logger.info("dynamically loading javaagent");
String nameOfRunningVM = ManagementFactory.getRuntimeMXBean().getName();
int p = nameOfRunningVM.indexOf('@');
String pid = nameOfRunningVM.substring(0, p);
String jarFilePath = getJarPath();
if(jarFilePath==null){
throw new RuntimeException("Cannot find either the compilation target folder nor the EvoSuite jar in classpath: "+System.getProperty("java.class.path"));
} else {
logger.info("Using JavaAgent in "+jarFilePath);
}
/*
* We need to use reflection on a new instantiated ClassLoader because
* we can make no assumption whatsoever on the class loader of AgentLoader
*
* TODO: it is likely that here, instead of null, we should access to an environment variable
* to identify where tools.jar is.
* This is because maybe there can be problems if tests generated on local machine are then
* published on a remote Continuous Integration server
*/
ClassLoader toolLoader = new ToolsJarLocator(null).getLoaderForToolsJar();
logger.info("Classpath: "+System.getProperty("java.class.path"));
try {
logger.info("Going to attach agent to process "+pid);
attachAgent(pid, jarFilePath, toolLoader);
} catch (Exception e) {
Throwable cause = e.getCause();
String causeDescription = cause==null ? "" : " , cause "+cause.getClass()+" "+cause.getMessage();
logger.error("Exception "+e.getClass()+": "+e.getMessage()+causeDescription,e);
try {
Thread.sleep(5000);
String msg = "Trying again to attach agent:" + jarFilePath + "\n";
msg += "VM: "+nameOfRunningVM + "\n";
msg += "PID: "+pid + "\n";
logger.error(msg);
attachAgent(pid, jarFilePath, toolLoader);
} catch(Exception e2) {
throw new RuntimeException(e2);
}
}
alreadyLoaded = true;
}
private static void attachAgent(String pid, String jarFilePath,
ClassLoader toolLoader) throws Exception {
Class string = toolLoader.loadClass("java.lang.String");
Class provider = toolLoader.loadClass("com.sun.tools.attach.spi.AttachProvider");
Method getProviders = provider.getDeclaredMethod("providers");
List list = (List) getProviders.invoke(null);
if(list==null || list.isEmpty()){
String msg = "AttachProvider.providers() failed to return any provider. Tool classloader: "+toolLoader;
throw new RuntimeException(msg);
}
if(list.stream().anyMatch(k -> k==null)){
throw new RuntimeException("AttachProvider.providers() returned null values");
}
Class clazz = toolLoader.loadClass("com.sun.tools.attach.VirtualMachine");
Method attach = clazz.getMethod("attach", string);
Object instance = null;
try {
instance = attach.invoke(null, pid);
} catch (Exception e){
throw new RuntimeException("Failed to attach Java Agent. Tool classloader: "+toolLoader,e);
}
Method loadAgent = clazz.getMethod("loadAgent", string, string);
loadAgent.invoke(instance, jarFilePath, "");
Method detach = clazz.getMethod("detach");
detach.invoke(instance);
}
private static boolean isEvoSuiteMainJar(String path) throws IllegalArgumentException{
if(path.endsWith("classes")){
/*
we need to treat this specially:
eg, Jenkins/Maven on Linux on a module with only tests ended up
with not creating "target/classes" (it does on Mac though) but still putting
it on the classpath
*/
return false;
}
File file = new File(path);
if(!file.exists()){
throw new IllegalArgumentException("Non-existing file "+path);
}
String name = file.getName();
if(name.toLowerCase().contains("evosuite") && name.endsWith(".jar")){
try (JarFile jar = new JarFile(file);){
Manifest manifest = jar.getManifest();
if(manifest == null){
return false;
}
Attributes attributes = manifest.getMainAttributes();
String agentClass = attributes.getValue("Agent-Class");
String agent = InstrumentingAgent.class.getName(); // this is hardcoded in the pom.xml file
if(agentClass != null && agentClass.trim().equalsIgnoreCase(agent)){
return true;
}
} catch (IOException e) {
return false;
}
}
return false;
}
private static String getJarPath(){
String classPath = System.getProperty("java.class.path");
String jarFilePath = searchInAClassPath(classPath);
if(jarFilePath==null){
jarFilePath = searchInCurrentClassLoaderIfUrlOne();
}
if(jarFilePath==null){
jarFilePath = searchInCurrentClassLoaderIfItProvidesClasspathAPI();
}
if(jarFilePath==null){
/*
* this could happen in Eclipse or during test execution in Maven, and so search in compilation 'target' folder
*/
jarFilePath = searchInFolder("target");
}
if(jarFilePath==null){
/*
* this could happen in Eclipse or during test execution in Maven, and so search in compilation 'target' folder
*/
/*
* FIXME: what is this???????? Definitively the above comment
* is just a copy&paste that makes no sense here...
*/
jarFilePath = searchInFolder("lib");
}
if(jarFilePath==null){
/*
* nothing seems to work, so try .m2 folder
*/
//this can really mess up things
//jarFilePath = searchInM2();
}
return jarFilePath;
}
private static String searchInAClassPath(String classPath){
String[] tokens = classPath.split(File.pathSeparator);
for(String entry : tokens){
if(entry==null || entry.isEmpty()){
continue;
}
String jar = findEvoSuiteMainJar(entry);
if(jar != null){
return jar;
}
}
return null;
}
private static String searchInCurrentClassLoaderIfItProvidesClasspathAPI(){
/*
this could happen for AntClassLoader.
Note: we cannot use instanceof here, as we do not want to add further third-party dependencies
*/
ClassLoader loader = AgentLoader.class.getClassLoader();
while(loader != null){
try {
Method m = loader.getClass().getMethod("getClasspath");
String classPath = (String) m.invoke(loader);
String jar = searchInAClassPath(classPath);
if(jar != null){
return jar;
}
} catch (Exception e) {
//OK, this can happen, not really an error
}
loader = loader.getParent();
}
return null;
}
private static String searchInCurrentClassLoaderIfUrlOne() {
Set uris = new HashSet<>();
ClassLoader loader = AgentLoader.class.getClassLoader();
while(loader != null){
if(loader instanceof URLClassLoader){
URLClassLoader urlLoader = (URLClassLoader) loader;
for(URL url : urlLoader.getURLs()){
try {
URI uri = url.toURI();
uris.add(uri);
File file = new File(uri);
String path = file.getAbsolutePath();
String jar = findEvoSuiteMainJar(path);
if(jar != null){
return jar;
}
} catch (Exception e) {
logger.error("Error while parsing URL "+url);
continue;
}
}
}
loader = loader.getParent();
}
String msg = "Failed to find EvoSuite jar in current classloader. URLs of classloader:";
for(URI uri : uris){
msg += "\n"+uri.toString();
}
logger.warn(msg);
return null;
}
private static String findEvoSuiteMainJar(String path){
if(isEvoSuiteMainJar(path)){
return path;
}
if(JarPathing.isPathingJar(path)){
for(String subpath : JarPathing.extractCPFromPathingJar(path).split(File.pathSeparator)){
if(isEvoSuiteMainJar(subpath)){
return subpath;
}
}
}
return null;
}
private static String searchInFolder(String folder) {
File target = new File(folder);
if(!target.exists()){
logger.debug("No target folder "+target.getAbsolutePath());
return null;
}
if(!target.isDirectory()){
logger.debug("'target' exists, but it is not a folder");
return null;
}
for(File file : target.listFiles()){
String path = file.getAbsolutePath();
String jar = findEvoSuiteMainJar(path);
if(jar != null){
return jar;
}
}
return null;
}
}
