ManageDialog.java

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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 com.android.vpndialogs;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.net.IConnectivityManager;
import android.os.Handler;
import android.os.Message;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.TextView;

import com.android.internal.net.VpnConfig;

import java.io.DataInputStream;
import java.io.FileInputStream;

public class ManageDialog extends Activity implements Handler.Callback,
        DialogInterface.OnClickListener, DialogInterface.OnDismissListener {
    private static final String TAG = "VpnManage";

    private VpnConfig mConfig;

    private IConnectivityManager mService;

    private AlertDialog mDialog;
    private TextView mDuration;
    private TextView mDataTransmitted;
    private TextView mDataReceived;

    private Handler mHandler;

    @Override
    protected void onResume() {
        super.onResume();

        if (getCallingPackage() != null) {
            Log.e(TAG, getCallingPackage() + " cannot start this activity");
            finish();
            return;
        }

        try {
            mConfig = getIntent().getParcelableExtra("config");

            mService = IConnectivityManager.Stub.asInterface(
                    ServiceManager.getService(Context.CONNECTIVITY_SERVICE));

            View view = View.inflate(this, R.layout.manage, null);
            if (mConfig.session != null) {
                ((TextView) view.findViewById(R.id.session)).setText(mConfig.session);
            }
            mDuration = (TextView) view.findViewById(R.id.duration);
            mDataTransmitted = (TextView) view.findViewById(R.id.data_transmitted);
            mDataReceived = (TextView) view.findViewById(R.id.data_received);

            if (mConfig.user.equals(VpnConfig.LEGACY_VPN)) {
                mDialog = new AlertDialog.Builder(this)
                        .setIcon(android.R.drawable.ic_dialog_info)
                        .setTitle(R.string.legacy_title)
                        .setView(view)
                        .setNeutralButton(R.string.disconnect, this)
                        .setNegativeButton(android.R.string.cancel, this)
                        .create();
            } else {
                PackageManager pm = getPackageManager();
                ApplicationInfo app = pm.getApplicationInfo(mConfig.user, 0);
                mDialog = new AlertDialog.Builder(this)
                        .setIcon(app.loadIcon(pm))
                        .setTitle(app.loadLabel(pm))
                        .setView(view)
                        .setNeutralButton(R.string.disconnect, this)
                        .setNegativeButton(android.R.string.cancel, this)
                        .create();
            }

            if (mConfig.configureIntent != null) {
                mDialog.setButton(DialogInterface.BUTTON_POSITIVE,
                        getText(R.string.configure), this);
            }
            mDialog.setOnDismissListener(this);
            mDialog.show();

            if (mHandler == null) {
                mHandler = new Handler(this);
            }
            mHandler.sendEmptyMessage(0);
        } catch (Exception e) {
            Log.e(TAG, "onResume", e);
            finish();
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mDialog != null) {
            mDialog.setOnDismissListener(null);
            mDialog.dismiss();
        }
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        try {
            if (which == AlertDialog.BUTTON_POSITIVE) {
                mConfig.configureIntent.send();
            } else if (which == AlertDialog.BUTTON_NEUTRAL) {
                mService.prepareVpn(mConfig.user, VpnConfig.LEGACY_VPN);
            }
        } catch (Exception e) {
            Log.e(TAG, "onClick", e);
            finish();
        }
    }

    @Override
    public void onDismiss(DialogInterface dialog) {
        finish();
    }

    @Override
    public boolean handleMessage(Message message) {
        mHandler.removeMessages(0);

        if (mDialog.isShowing()) {
            if (mConfig.startTime != 0) {
                long seconds = (SystemClock.elapsedRealtime() - mConfig.startTime) / 1000;
                mDuration.setText(String.format("%02d:%02d:%02d",
                        seconds / 3600, seconds / 60 % 60, seconds % 60));
            }

            String[] numbers = getStatistics();
            if (numbers != null) {
                // [1] and [2] are received data in bytes and packets.
                mDataReceived.setText(getString(R.string.data_value_format,
                        numbers[1], numbers[2]));

                // [9] and [10] are transmitted data in bytes and packets.
                mDataTransmitted.setText(getString(R.string.data_value_format,
                        numbers[9], numbers[10]));
            }
            mHandler.sendEmptyMessageDelayed(0, 1000);
        }
        return true;
    }

    private String[] getStatistics() {
        DataInputStream in = null;
        try {
            // See dev_seq_printf_stats() in net/core/dev.c.
            in = new DataInputStream(new FileInputStream("/proc/net/dev"));
            String prefix = mConfig.interfaze + ':';

            while (true) {
                String line = in.readLine().trim();
                if (line.startsWith(prefix)) {
                    String[] numbers = line.substring(prefix.length()).split(" +");
                    for (int i = 1; i < 17; ++i) {
                        if (!numbers[i].equals("0")) {
                            return numbers;
                        }
                    }
                    break;
                }
            }
        } catch (Exception e) {
            // ignore
        } finally {
            try {
                in.close();
            } catch (Exception e) {
                // ignore
            }
        }
        return null;
    }
}