DroidPlugin插件化開發，droidplugin插件

DroidPlugin插件化開發，droidplugin插件

360手機助手使用的 DroidPlugin，它是360手機助手團隊在Android系統上實現了一種插件機制。它可以在無需安裝、修改的情況下運行APK文件,此機制對改進大型APP的架構，實現多團隊協作開發具有一定的好處。

它是一種新的插件機制，一種免安裝的運行機制

github地址： https://github.com/DroidPluginTeam/DroidPlugin

參考博客：http://blog.csdn.net/hejjunlin/article/details/52124397

DroidPlugin的的基本原理：

　　共享進程：為android提供一個進程運行多個apk的機制，通過API欺騙機制瞞過系統

　　占坑：通過預先占坑的方式實現不用在manifest注冊，通過一帶多的方式實現服務管理

　　Hook機制：動態代理實現函數hook，Binder代理繞過部分系統服務限制，IO重定向（先獲取原始Object-->Read,然後動態代理Hook Object後-->Write回去，達到瞞天過海的目的）

public abstract class Hook {

    private boolean mEnable = false;//能否hook

    protected Context mHostContext;//宿主context,外部傳入
    protected BaseHookHandle mHookHandles;

    public void setEnable(boolean enable, boolean reInstallHook) {
        this.mEnable = enable;
    }

    public final void setEnable(boolean enable) {
        setEnable(enable, false);
    }

    public boolean isEnable() {
        return mEnable;
    }


    protected Hook(Context hostContext) {
        mHostContext = hostContext;
        mHookHandles = createHookHandle();
    }

    protected abstract BaseHookHandle createHookHandle();//用於子類創建Hook機制


    protected abstract void onInstall(ClassLoader classLoader) throws Throwable;//插件安裝

    protected void onUnInstall(ClassLoader classLoader) throws Throwable {//插件卸載

    }
}

public class HookedMethodHandler {//Hook方法

    private static final String TAG = HookedMethodHandler.class.getSimpleName();
    protected final Context mHostContext;
    /**
     *  調用方法的時候會到AppOpsService進行判斷uid（宿主apk）和插件的包名是否匹配，此處是不匹配的
     *  此時就可以經過轉換欺騙系統讓程序認為是宿主apk調過來的（這樣的前提就需要宿主把所有的權限都申請了）
     *  因為系統只會去檢測宿主apk
     * **/
    private Object mFakedResult = null;//用於欺騙系統
    private boolean mUseFakedResult = false;

    public HookedMethodHandler(Context hostContext) {
        this.mHostContext = hostContext;
    }


    public synchronized Object doHookInner(Object receiver, Method method, Object[] args) throws Throwable {
        long b = System.currentTimeMillis();
        try {
            mUseFakedResult = false;
            mFakedResult = null;
            boolean suc = beforeInvoke(receiver, method, args);
            Object invokeResult = null;
            if (!suc) {//false執行原始方法
                invokeResult = method.invoke(receiver, args);
            }
            afterInvoke(receiver, method, args, invokeResult);
            if (mUseFakedResult) {//true返回欺騙結果，false返回正常的調用方法
                return mFakedResult;
            } else {
                return invokeResult;
            }
        } finally {
            long time = System.currentTimeMillis() - b;
            if (time > 5) {
                Log.i(TAG, "doHookInner method(%s.%s) cost %s ms", method.getDeclaringClass().getName(), method.getName(), time);
            }
        }
    }

    public void setFakedResult(Object fakedResult) {
        this.mFakedResult = fakedResult;
        mUseFakedResult = true;
    }

    /**
     * 在某個方法被調用之前執行，如果返回true，則不執行原始的方法，否則執行原始方法
     */
    protected boolean beforeInvoke(Object receiver, Method method, Object[] args) throws Throwable {
        return false;
    }

    protected void afterInvoke(Object receiver, Method method, Object[] args, Object invokeResult) throws Throwable {
    }

    public boolean isFakedResult() {
        return mUseFakedResult;
    }

    public Object getFakedResult() {
        return mFakedResult;
    }
}

abstract class BinderHook extends Hook implements InvocationHandler {

    private Object mOldObj;

    public BinderHook(Context hostContext) {
        super(hostContext);
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        try {
            if (!isEnable()) {//如果不能Hook，執行原方法
                return method.invoke(mOldObj, args);
            }
            HookedMethodHandler hookedMethodHandler = mHookHandles.getHookedMethodHandler(method);
            if (hookedMethodHandler != null) {
                return hookedMethodHandler.doHookInner(mOldObj, method, args);
            } else {
                return method.invoke(mOldObj, args);
            }
        } catch (InvocationTargetException e) {
            Throwable cause = e.getTargetException();
            if (cause != null && MyProxy.isMethodDeclaredThrowable(method, cause)) {
                throw cause;
            } else if (cause != null) {
                RuntimeException runtimeException = !TextUtils.isEmpty(cause.getMessage()) ? new RuntimeException(cause.getMessage()) : new RuntimeException();
                runtimeException.initCause(cause);
                throw runtimeException;
            } else {
                RuntimeException runtimeException = !TextUtils.isEmpty(e.getMessage()) ? new RuntimeException(e.getMessage()) : new RuntimeException();
                runtimeException.initCause(e);
                throw runtimeException;
            }
        } catch (IllegalArgumentException e) {
            try {
                StringBuilder sb = new StringBuilder();
                sb.append(" DROIDPLUGIN{");
                if (method != null) {
                    sb.append("method[").append(method.toString()).append("]");
                } else {
                    sb.append("method[").append("NULL").append("]");
                }
                if (args != null) {
                    sb.append("args[").append(Arrays.toString(args)).append("]");
                } else {
                    sb.append("args[").append("NULL").append("]");
                }
                sb.append("}");

                String message = e.getMessage() + sb.toString();
                throw new IllegalArgumentException(message, e);
            } catch (Throwable e1) {
                throw e;
            }
        } catch (Throwable e) {
            if (MyProxy.isMethodDeclaredThrowable(method, e)) {
                throw e;
            } else {
                RuntimeException runtimeException = !TextUtils.isEmpty(e.getMessage()) ? new RuntimeException(e.getMessage()) : new RuntimeException();
                runtimeException.initCause(e);
                throw runtimeException;
            }
        }
    }

    abstract Object getOldObj() throws Exception;

    void setOldObj(Object mOldObj) {
        this.mOldObj = mOldObj;
    }

    public abstract String getServiceName();//具體Hook哪一個service

    /**
     * 先調用ServiceManagerCacheBinderHook的onInstall()方法更新一下service cache
     * 然後生成一個新的代理對象放到mProxiedObjCache裡。這樣下次不管是從cache裡取，還是直接通過binder調用，就都會返回我們的代理對象。
     * **/
    @Override
    protected void onInstall(ClassLoader classLoader) throws Throwable {
        new ServiceManagerCacheBinderHook(mHostContext, getServiceName()).onInstall(classLoader);
        mOldObj = getOldObj();
        Class<?> clazz = mOldObj.getClass();//得到class
        List<Class<?>> interfaces = Utils.getAllInterfaces(clazz);
        Class[] ifs = interfaces != null && interfaces.size() > 0 ? interfaces.toArray(new Class[interfaces.size()]) : new Class[0];
        //用原始對象的classloader傳入動態代理，得到代理對象
        Object proxiedObj = MyProxy.newProxyInstance(clazz.getClassLoader(), ifs, this);
        MyServiceManager.addProxiedObj(getServiceName(), proxiedObj);
    }
}

結論就是讀取插件apk，和宿主的uid對比，然後進行包替換，在利用binder代理Hook，啟動插件，這概括很是大概，不過涉及太復雜

然後是使用了，結束和使用都很多資料，很詳細，不過自己研究了一翻記錄下心得，也能加深理解和印象

public class MainActivity extends AppCompatActivity {

    private String filepath = null, packageName = "cn.liuzhen.plugin";
    private TextView tv_val;
    private Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        context = MainActivity.this;
        tv_val = (TextView)findViewById(R.id.tv_val);
        filepath = Environment.getExternalStorageDirectory().getAbsolutePath().concat("/test.apk");
    }

    public void click(View view) {
        if (filepath == null){
            Toast.makeText(context,"filepath is null",Toast.LENGTH_SHORT).show();
            return;
        }
        String result = null;
        int code = -1;
        try {
            switch (view.getId()) {
                case R.id.btn_install:
                    code = PluginManager.getInstance().installPackage(filepath, PackageManagerCompat.INSTALL_REPLACE_EXISTING);
                    result = "install";
                    switch (code) {
                        case PluginManager.INSTALL_FAILED_NO_REQUESTEDPERMISSION:
                            result = "安裝失敗，文件請求的權限太多";
                            break;
                        case PackageManagerCompat.INSTALL_FAILED_NOT_SUPPORT_ABI:
                            result = "宿主不支持插件的abi環境，可能宿主運行時為64位，但插件只支持32位";
                            break;
                        case PackageManagerCompat.INSTALL_SUCCEEDED:
                            result = "安裝完成";
                            break;
                    }
                    break;
                case R.id.btn_del:
                    PluginManager.getInstance().deletePackage(packageName, 0);
                    result = "del";
                    break;
                case R.id.btn_open:
                    PackageManager pm = getPackageManager();
                    Intent intent = pm.getLaunchIntentForPackage("cn.liuzhen.plugin");
                    if (intent == null){
                        result = "intent is null";
                    }else
                        startActivity(intent);
                    break;
            }

        } catch (RemoteException e) {
            result = "安裝失敗 "+e.getMessage();
        }
        tv_val.setText(result);
    }

}

運行程序成功，然後把運行的apk復制一份，我上面的名稱是寫死的，test.apk，然後放在根目錄，點擊安裝，顯示成功後在點擊打開，就能見到跳轉到插件界面了，插件化通了

接下來就是看自己怎麼設計和開發了，什麼東西也不能隨便使用，得好好考慮，個人覺得插件化不宜大范圍使用，適合小菜單的集成，畢竟都是反射的，而且還得考慮好安全問題