编写Xposed模块Hook多dex的APK

2017/08/31 Android

编写Xposed模块Hook多Dex的apk

最近在研究使用Xposed去Hook一个apk,但是在Hook的过程中发现,无论如何都不能hook成功.经过进一步对该APK进行研究发现,我需要的对象在第二个dex文件中. Xposed是默认没有办法处理多Dex的情况的. 所以hook多个dex文件的代码需要自己去实现.经过查找资料之后发现有办法可以解决多dex的hook的问题.关键部分的代码如下:

import android.app.Application;
import android.content.Context;
import android.content.pm.ApplicationInfo;

import de.robv.android.xposed.IXposedHookLoadPackage;
import de.robv.android.xposed.XC_MethodHook;
import de.robv.android.xposed.XposedBridge;
import de.robv.android.xposed.XposedHelpers;
import de.robv.android.xposed.callbacks.XC_LoadPackage.LoadPackageParam;

/**
 * Created by tiankai on 17-8-23.
 */

public class HookVerifyCode implements IXposedHookLoadPackage {

    private static final String class_name = "the class name ";
    public static String phone_number = "";      // this argument is a global
    private static final String PACKAGENAME = "com.payegis.hookmoule";
    private static final String XPOSEDINSTALLER = "de.robv.android.xposed.installer";
    private static final String SMSPACKAGENAME = "com.google.android.talk";
    private static final String TARGETPACKAGENAME = "the target process name";


    public void handleLoadPackage(LoadPackageParam lpparam) throws Throwable {

        if (lpparam.appInfo != null && lpparam.isFirstApplication
                && (SMSPACKAGENAME.equals(lpparam.packageName) || OFOPACKAGENAME.equals(lpparam.packageName))) {
            // hook android.app.Application.attach method
            XposedHelpers.findAndHookMethod(Application.class, "attach", Context.class, new XC_MethodHook() {
                @Override
                protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
                     // this will be called before the clock was updated by the original method
                }

                @Override
                protected void afterHookedMethod(XC_MethodHook.MethodHookParam param) throws Throwable {
                    ClassLoader cl = ((Context) param.args[0]).getClassLoader();
                    Class<?> hookclass = null;
                    try {
                        hookclass = cl.loadClass(class_name);
                    } catch (Exception e) {
                        Logger.log("[Failed!]Can not find " + class_name);
                        return;
                    }
                    Logger.log("[success!]Find class " + class_name);

                    XposedHelpers.findAndHookMethod(hookclass,
                            "getVerifyCode", new XC_MethodHook() {
                                @Override
                                protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
                                    // this will be called before the clock was updated by the original method
                                }

                                @Override
                                protected void afterHookedMethod(MethodHookParam param) throws Throwable {
                                    // this will be called after the clock was updated by the original method
                                    String verify_code = param.getResult().toString();
                                    if (verify_code.length() == 4) {
                                        Logger.log("the verify code:" + verify_code);
                                        Logger.log("the final phone number: " + HookManager.phone_number);
                                    }
                                }
                            });
                }
            });  // end of findAndHookMethod
        } // end of if 
    }  // end of handlePackage
} // end of class

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