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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import dalvik.system.PathClassLoader;
import dalvik.system.VMDebug;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.File;
import java.io.IOException;
public class Main {
public static void main(String[] args) throws Exception {
System.loadLibrary(args[0]);
System.out.println("Hello, world!");
String agent = null;
// By default allow debugging
boolean debugging_allowed = true;
for(String a : args) {
if(a.startsWith("agent:")) {
agent = a.substring(6);
} else if (a.equals("disallow-debugging")) {
debugging_allowed = false;
}
}
if (agent == null) {
throw new Error("Could not find agent: argument!");
}
setDebuggingAllowed(debugging_allowed);
// Setup is finished. Try to attach agent in 2 ways.
try {
VMDebug.attachAgent(agent);
} catch(SecurityException e) {
System.out.println(e.getMessage());
}
attachWithClassLoader(args);
System.out.println("Goodbye!");
}
private static native void setDebuggingAllowed(boolean val);
private static void attachWithClassLoader(String[] args) throws Exception {
for(String a : args) {
if(a.startsWith("agent:")) {
String agentName = a.substring(6, a.indexOf('='));
File tmp = null;
try {
tmp = File.createTempFile("lib", ".so");
prepare(agentName, tmp);
String newAgentName = tmp.getName();
String agent = a.substring(6).replace(agentName, newAgentName);
ClassLoader cl = new PathClassLoader("", tmp.getParentFile().getAbsolutePath(),
Main.class.getClassLoader());
try {
VMDebug.attachAgent(agent, cl);
} catch(SecurityException e) {
System.out.println(e.getMessage());
}
} catch (Exception e) {
e.printStackTrace(System.out);
} finally {
if (tmp != null) {
tmp.delete();
}
}
}
}
}
private static void prepare(String in, File tmp) throws Exception {
// Find the original.
File orig = find(in);
if (orig == null) {
throw new RuntimeException("Could not find " + in);
}
// Copy the original.
{
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(orig));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(tmp));
byte[] buf = new byte[16 * 1024];
for (;;) {
int r = bis.read(buf, 0, buf.length);
if (r < 0) {
break;
} else if (r > 0) {
bos.write(buf, 0, r);
}
}
bos.close();
bis.close();
}
}
private static File find(String in) {
String libraryPath = System.getProperty("java.library.path");
for (String path : libraryPath.split(":")) {
File f = new File(path + "/" + in);
if (f.exists()) {
return f;
}
}
return null;
}
}
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