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scouter.agent.AgentTransformer Maven / Gradle / Ivy
/*
* Copyright 2015 the original author or authors.
* @https://github.com/scouter-project/scouter
*
* 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.
*/
package scouter.agent;
import scouter.agent.asm.*;
import scouter.agent.asm.asyncsupport.AsyncContextDispatchASM;
import scouter.agent.asm.asyncsupport.CallRunnableASM;
import scouter.agent.asm.asyncsupport.RequestStartAsyncASM;
import scouter.agent.asm.asyncsupport.spring.SpringAsyncExecutionASM;
import scouter.agent.asm.util.AsmUtil;
import scouter.agent.util.AsyncRunner;
import scouter.lang.conf.ConfObserver;
import scouter.org.objectweb.asm.*;
import scouter.util.FileUtil;
import scouter.util.IntSet;
import java.io.IOException;
import java.io.InputStream;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import java.util.List;
public class AgentTransformer implements ClassFileTransformer {
public static final String JAVA_UTIL_MAP = "java/util/Map";
public static ThreadLocal hookingCtx = new ThreadLocal();
protected static List asms = new ArrayList();
// hook 관련 설정이 변경되면 자동으로 변경된다.
private static int hook_signature;
static {
final Configure conf = Configure.getInstance();
reload();
hook_signature = conf.getHookSignature();
ConfObserver.add("AgentTransformer", new Runnable() {
public void run() {
if (conf.getHookSignature() != hook_signature) {
reload();
}
hook_signature = conf.getHookSignature();
}
});
}
public static void reload() {
Configure conf = Configure.getInstance();
List temp = new ArrayList();
temp.add(new HttpServiceASM());
temp.add(new ServiceASM());
temp.add(new RequestStartAsyncASM());
temp.add(new AsyncContextDispatchASM());
temp.add(new JDBCPreparedStatementASM());
temp.add(new JDBCResultSetASM());
temp.add(new JDBCStatementASM());
temp.add(new SqlMapASM());
temp.add(new UserTxASM());
temp.add(new JDBCConnectionOpenASM());
temp.add(new JDBCDriverASM());
temp.add(new InitialContextASM());
temp.add(new CapArgsASM());
temp.add(new CapReturnASM());
temp.add(new CapThisASM());
temp.add(new MethodASM());
temp.add(new ApicallASM());
temp.add(new ApicallInfoASM());
temp.add(new ApicallSpringHttpAccessorASM());
temp.add(new SpringAsyncExecutionASM());
temp.add(new CallRunnableASM());
temp.add(new SpringReqMapASM());
temp.add(new SocketASM());
temp.add(new JspServletASM());
temp.add(new MapImplASM());
temp.add(new UserExceptionASM());
temp.add(new UserExceptionHandlerASM());
temp.add(new AddFieldASM());
asms = temp;
}
// //////////////////////////////////////////////////////////////
// boot class이지만 Hooking되어야하는 클래스를 등록한다.
private static IntSet asynchook = new IntSet();
static {
asynchook.add("sun/net/www/protocol/http/HttpURLConnection".hashCode());
asynchook.add("sun/net/www/http/HttpClient".hashCode());
asynchook.add("java/net/Socket".hashCode());
asynchook.add("java/nio/channels/SocketChannel".hashCode());
asynchook.add("sun/nio/ch/SocketChannelImpl".hashCode());
asynchook.add("javax/naming/InitialContext".hashCode());
}
private Configure conf = Configure.getInstance();
private Logger.FileLog bciOut;
public byte[] transform(final ClassLoader loader, String className, final Class classBeingRedefined,
ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {
try {
hookingCtx.set(loader);
// if(className != null && (className.indexOf("http") >= 0 || className.indexOf("Http") >= 0)) {
// System.out.println("[!!!!!!!!] loading ...http className = " + className);
// }
if (className == null)
return null;
if (classBeingRedefined == null) {
if (asynchook.contains(className.hashCode())) {
AsyncRunner.getInstance().add(loader, className, classfileBuffer);
return null;
}
if (loader == null) {
if (conf._hook_boot_prefix == null || conf._hook_boot_prefix.length() == 0 || false == className.startsWith(conf._hook_boot_prefix)) {
return null;
}
}
}
if (className.startsWith("scouter/")) {
return null;
}
//
classfileBuffer = DirectPatch.patch(className, classfileBuffer);
ObjTypeDetector.check(className);
final ClassDesc classDesc = new ClassDesc();
ClassReader cr = new ClassReader(classfileBuffer);
cr.accept(new ClassVisitor(Opcodes.ASM4) {
public void visit(int version, int access, String name, String signature, String superName,
String[] interfaces) {
classDesc.set(version, access, name, signature, superName, interfaces);
if (conf._hook_map_impl_enabled) {
classDesc.isMapImpl = isMapImpl(superName, interfaces, loader);
}
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
classDesc.anotation += desc;
return super.visitAnnotation(desc, visible);
}
}, 0);
if (AsmUtil.isInterface(classDesc.access)) {
return null;
}
classDesc.classBeingRedefined = classBeingRedefined;
ClassWriter cw = getClassWriter(classDesc);
ClassVisitor cv = cw;
List workAsms = asms;
for (int i = workAsms.size() - 1; i >= 0; i--) {
cv = workAsms.get(i).transform(cv, className, classDesc);
if (cv != cw) {
cr = new ClassReader(classfileBuffer);
cr.accept(cv, ClassReader.EXPAND_FRAMES);
classfileBuffer = cw.toByteArray();
cv = cw = getClassWriter(classDesc);
if (conf._log_asm_enabled) {
if (this.bciOut == null) {
this.bciOut = new Logger.FileLog("./scouter.bci");
}
this.bciOut.println(className + "\t\t[" + loader + "]");
}
}
}
return classfileBuffer;
} catch (Throwable t) {
Logger.println("A101", "Transformer Error", t);
t.printStackTrace();
} finally {
hookingCtx.set(null);
}
return null;
}
private boolean isMapImpl(String superName, String[] interfaces, ClassLoader loader) {
String[] classes = new String[interfaces.length + 1];
System.arraycopy(interfaces, 0, classes, 0, interfaces.length);
classes[classes.length-1] = superName;
for (int i = 0; i < classes.length; i++) {
if (isMapImpl(classes[i], loader)) {
return true;
}
}
return false;
}
private boolean isMapImpl(String clazz, ClassLoader loader) {
if("java/lang/Object".equals(clazz)) {
return false;
}
if (JAVA_UTIL_MAP.equals(clazz)) {
return true;
}
if(loader == null) {
loader = ClassLoader.getSystemClassLoader();
}
InputStream in = loader.getResourceAsStream(clazz + ".class");
try {
ClassReader classReader = new ClassReader(in);
String[] interfaces = classReader.getInterfaces();
if (interfaces != null && interfaces.length > 0) {
for (int i = 0; i < interfaces.length; i++) {
if(JAVA_UTIL_MAP.equals(interfaces[i])) {
return true;
}
isMapImpl(interfaces[i], loader);
}
}
String superClassName = classReader.getSuperName();
if(superClassName == null) {
return false;
}
if(JAVA_UTIL_MAP.equals(superClassName)) {
return true;
}
isMapImpl(superClassName, loader);
} catch (IOException e) {
System.out.println("[A189]-isMapImpl-check super class : " + clazz);
}
return false;
}
private ClassWriter getClassWriter(final ClassDesc classDesc) {
ClassWriter cw;
switch (classDesc.version) {
case Opcodes.V1_1:
case Opcodes.V1_2:
case Opcodes.V1_3:
case Opcodes.V1_4:
case Opcodes.V1_5:
case Opcodes.V1_6:
cw = new ScouterClassWriter(ClassWriter.COMPUTE_MAXS);
break;
default:
cw = new ScouterClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
}
return cw;
}
private void dump(String className, byte[] bytes) {
String fname = "/tmp/" + className.replace('/', '_');
FileUtil.save(fname, bytes);
}
}
