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scouter.agent.asm.JspServletASM 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.asm;
import scouter.org.objectweb.asm.ClassVisitor;
import scouter.org.objectweb.asm.MethodVisitor;
import scouter.org.objectweb.asm.Opcodes;
import scouter.org.objectweb.asm.Type;
import scouter.org.objectweb.asm.commons.LocalVariablesSorter;
import scouter.agent.ClassDesc;
import scouter.agent.Configure;
import scouter.agent.asm.util.AsmUtil;
import scouter.agent.asm.util.HookingSet;
import scouter.agent.trace.TraceMain;
import scouter.util.Pair;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class JspServletASM implements IASM, Opcodes {
private Map target = HookingSet.getHookingSet(Configure.getInstance().hook_jsp_patterns);
public static class JspTargetRegister {
public static final List> klassMethod = new ArrayList>();
public static void regist(String klass, String method) {
klassMethod.add(new Pair(klass, method));
}
}
public JspServletASM() {
AsmUtil.add(target, "org/apache/jasper/servlet/JspServlet", "serviceJspFile");
for(int i = JspTargetRegister.klassMethod.size() - 1; i >= 0; i--) {
AsmUtil.add(target, JspTargetRegister.klassMethod.get(i).getLeft(), JspTargetRegister.klassMethod.get(i).getRight());
}
}
public ClassVisitor transform(ClassVisitor cv, String className, ClassDesc classDesc) {
if (Configure.getInstance()._hook_jsp_enabled == false) {
return cv;
}
HookingSet mset = target.get(className);
if (mset == null)
return cv;
else
return new JspServletCV(cv, mset, className);
}
}
// ///////////////////////////////////////////////////////////////////////////
class JspServletCV extends ClassVisitor implements Opcodes {
public String className;
private HookingSet mset;
public JspServletCV(ClassVisitor cv, HookingSet mset, String className) {
super(ASM5, cv);
this.mset = mset;
this.className = className;
}
@Override
public MethodVisitor visitMethod(int access, String methodName, String desc, String signature, String[] exceptions) {
MethodVisitor mv = super.visitMethod(access, methodName, desc, signature, exceptions);
if (mv == null || mset.isA(methodName, desc) == false) {
return mv;
}
if (AsmUtil.isSpecial(methodName)) {
return mv;
}
return new JspServletMV(access, desc, mv, Type.getArgumentTypes(desc), (access & ACC_STATIC) != 0);
}
}
// ///////////////////////////////////////////////////////////////////////////
class JspServletMV extends LocalVariablesSorter implements Opcodes {
private static final String CLASS = TraceMain.class.getName().replace('.', '/');
private static final String METHOD = "jspServlet";
private static final String SIGNATURE = "([Ljava/lang/Object;)V";
private Type[] paramTypes;
private boolean isStatic;
public JspServletMV(int access, String desc, MethodVisitor mv, Type[] paramTypes, boolean isStatic) {
super(ASM5, access, desc, mv);
this.paramTypes = paramTypes;
this.isStatic = isStatic;
}
@Override
public void visitCode() {
int sidx = isStatic ? 0 : 1;
int arrVarIdx = newLocal(Type.getType("[Ljava/lang/Object;"));
AsmUtil.PUSH(mv, paramTypes.length);
mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
mv.visitVarInsn(Opcodes.ASTORE, arrVarIdx);
for (int i = 0; i < paramTypes.length; i++) {
Type tp = paramTypes[i];
mv.visitVarInsn(Opcodes.ALOAD, arrVarIdx);
AsmUtil.PUSH(mv, i);
switch (tp.getSort()) {
case Type.BOOLEAN:
mv.visitVarInsn(Opcodes.ILOAD, sidx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Boolean", "valueOf", "(Z)Ljava/lang/Boolean;",false);
break;
case Type.BYTE:
mv.visitVarInsn(Opcodes.ILOAD, sidx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Byte", "valueOf", "(B)Ljava/lang/Byte;",false);
break;
case Type.CHAR:
mv.visitVarInsn(Opcodes.ILOAD, sidx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Character", "valueOf", "(C)Ljava/lang/Character;",false);
break;
case Type.SHORT:
mv.visitVarInsn(Opcodes.ILOAD, sidx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Short", "valueOf", "(S)Ljava/lang/Short;",false);
break;
case Type.INT:
mv.visitVarInsn(Opcodes.ILOAD, sidx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Integer", "valueOf", "(I)Ljava/lang/Integer;",false);
break;
case Type.LONG:
mv.visitVarInsn(Opcodes.LLOAD, sidx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;",false);
break;
case Type.FLOAT:
mv.visitVarInsn(Opcodes.FLOAD, sidx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Float", "valueOf", "(F)Ljava/lang/Float;",false);
break;
case Type.DOUBLE:
mv.visitVarInsn(Opcodes.DLOAD, sidx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Double", "valueOf", "(D)Ljava/lang/Double;",false);
break;
default:
mv.visitVarInsn(Opcodes.ALOAD, sidx);
}
mv.visitInsn(Opcodes.AASTORE);
sidx += tp.getSize();
}
mv.visitVarInsn(Opcodes.ALOAD, arrVarIdx);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, CLASS, METHOD, SIGNATURE,false);
super.visitCode();
}
}
