scouter.agent.asm.JDBCGetConnectionASM.java Source code

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Here is the source code for scouter.agent.asm.JDBCGetConnectionASM.java

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/*
 *  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 java.util.HashMap;
import java.util.List;
import java.util.Map;

import scouter.agent.ClassDesc;
import scouter.agent.Configure;
import scouter.agent.Logger;
import scouter.agent.asm.util.AsmUtil;
import scouter.agent.asm.util.HookingSet;
import scouter.agent.trace.TraceSQL;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.LocalVariablesSorter;

public class JDBCGetConnectionASM implements IASM, Opcodes {
    private List<HookingSet> target = HookingSet
            .getHookingMethodSet(Configure.getInstance().hook_get_connection_patterns);
    private Map<String, HookingSet> reserved = new HashMap<String, HookingSet>();

    public JDBCGetConnectionASM() {
        //AsmUtil.add(reserved, "weblogic/jdbc/common/internal/RmiDataSource", "getConnection()Ljava/sql/Connection;");

    }

    public ClassVisitor transform(ClassVisitor cv, String className, ClassDesc classDesc) {
        if (Configure.getInstance()._hook_dbsql_enabled == false) {
            return cv;
        }

        HookingSet mset = reserved.get(className);
        if (mset != null)
            return new DataSourceCV(cv, mset, className);

        for (int i = 0; i < target.size(); i++) {
            mset = target.get(i);
            if (mset.classMatch.include(className)) {
                return new DataSourceCV(cv, mset, className);
            }
        }
        return cv;
    }
}

class DataSourceCV extends ClassVisitor implements Opcodes {

    public String className;
    private HookingSet mset;

    public DataSourceCV(ClassVisitor cv, HookingSet mset, String className) {
        super(ASM7, cv);
        this.mset = mset;
        this.className = className;

    }

    @Override
    public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
        MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
        if (mv == null || mset.isA(name, desc) == false) {
            return mv;
        }
        if (AsmUtil.isSpecial(name)) {
            return mv;
        }
        return new DataSourceMV(access, desc, mv, className, name);
    }
}

// ///////////////////////////////////////////////////////////////////////////
class DataSourceMV extends LocalVariablesSorter implements Opcodes {
    private static final String TRACE_SQL = TraceSQL.class.getName().replace('.', '/');
    private final static String METHOD = "getConnection";
    private static final String SIGNATURE = "(Ljava/sql/Connection;)Ljava/sql/Connection;";

    private Type returnType;
    private String className;
    private String methodName;
    private String methodDesc;

    public DataSourceMV(int access, String desc, MethodVisitor mv, String className, String methodName) {
        super(ASM7, access, desc, mv);
        this.returnType = Type.getReturnType(desc);
        this.className = className;
        this.methodName = methodName;
        this.methodDesc = desc;
    }

    @Override
    public void visitInsn(int opcode) {
        if ((opcode >= IRETURN && opcode <= RETURN)) {
            int i = newLocal(this.returnType);
            mv.visitVarInsn(ASTORE, i);
            mv.visitVarInsn(Opcodes.ALOAD, i);
            AsmUtil.PUSH(mv, className);
            AsmUtil.PUSH(mv, methodName);
            AsmUtil.PUSH(mv, methodDesc);
            mv.visitVarInsn(Opcodes.ALOAD, 0);

            mv.visitVarInsn(Opcodes.ALOAD, i);
            mv.visitMethodInsn(Opcodes.INVOKESTATIC, TRACE_SQL, METHOD, SIGNATURE, false);

        }
        mv.visitInsn(opcode);
    }

}