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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.test.util.wifistrengthscanner;
     18 
     19 import android.app.Activity;
     20 import android.app.Instrumentation;
     21 import android.content.BroadcastReceiver;
     22 import android.content.Context;
     23 import android.content.Intent;
     24 import android.content.IntentFilter;
     25 import android.net.wifi.ScanResult;
     26 import android.net.wifi.WifiInfo;
     27 import android.net.wifi.WifiManager;
     28 import android.os.Bundle;
     29 import android.os.Environment;
     30 import android.os.ParcelFileDescriptor;
     31 import android.util.Log;
     32 
     33 import java.io.FileInputStream;
     34 import java.io.IOException;
     35 import java.util.ArrayList;
     36 import java.util.List;
     37 import java.util.concurrent.CountDownLatch;
     38 import java.util.concurrent.TimeUnit;
     39 
     40 public class WifiStrengthScannerInstrumentation extends Instrumentation {
     41     private static final String TAG = WifiStrengthScannerInstrumentation.class.getCanonicalName();
     42     private final static String SD_CARD_PATH =
     43             Environment.getExternalStorageDirectory().getAbsolutePath() + "/";
     44     private final int NUMBER_OF_WIFI_LEVELS = 101;
     45     private final int INVALID_RSSI = -127;
     46     private Bundle mArguments;
     47     private CountDownLatch mLatch;
     48     private boolean scanReceived;
     49 
     50     @Override
     51     public void onCreate(Bundle arguments) {
     52         super.onCreate(arguments);
     53         mArguments = arguments;
     54         start();
     55     }
     56 
     57     @Override
     58     public void onStart() {
     59         super.onStart();
     60         try {
     61             mLatch = new CountDownLatch(1);
     62             getContext().registerReceiver(new WifiScanReceiver(),
     63                     new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
     64             WifiManager wifiManager =
     65                     (WifiManager) getContext().getSystemService(Context.WIFI_SERVICE);
     66             scanReceived = false;
     67             wifiManager.startScan();
     68             mLatch.await(10000, TimeUnit.MILLISECONDS);
     69 
     70             if (!scanReceived) {
     71                 sendFailureStatus("no_scan_received");
     72                 finish(Activity.RESULT_CANCELED, new Bundle());
     73                 return;
     74             }
     75 
     76             WifiInfo wifiInfo = wifiManager.getConnectionInfo();
     77             Bundle bundle = new Bundle();
     78             bundle.putString("suplicant_state", wifiInfo.getSupplicantState().name());
     79 
     80             String bssid = wifiInfo.getBSSID();
     81             bundle.putString("bssid", bssid);
     82             // zero counts as a level, so the max level is one less that the number of levels.
     83             bundle.putInt("wifi_max_level", NUMBER_OF_WIFI_LEVELS - 1);
     84 
     85             bundle.putInt("wifi_info_wifi_level",
     86                     WifiManager.calculateSignalLevel(wifiInfo.getRssi(), NUMBER_OF_WIFI_LEVELS));
     87             bundle.putInt("wifi_info_rssi", wifiInfo.getRssi());
     88             bundle.putInt("wifi_info_frequency", wifiInfo.getFrequency());
     89 
     90             ScanResult result = getScanResult(wifiManager, bssid);
     91             if (result != null) {
     92                 bundle.putInt("scan_result_wifi_level", wifiManager.calculateSignalLevel(result
     93                         .level, NUMBER_OF_WIFI_LEVELS));
     94                 bundle.putInt("scan_result_rssi", result.level);
     95                 bundle.putInt("scan_result_frequency", result.frequency);
     96             }
     97 
     98             int dumpsysRssi = getRssiFromDumpsys(bssid);
     99             bundle.putInt("dumpsys_rssi", dumpsysRssi);
    100             bundle.putInt("dumpsys_wifi_level",
    101                     WifiManager.calculateSignalLevel(dumpsysRssi, NUMBER_OF_WIFI_LEVELS));
    102             sendStatus(Activity.RESULT_OK, bundle);
    103             finish(Activity.RESULT_OK, new Bundle());
    104         } catch (IOException e) {
    105             Log.e(TAG, Log.getStackTraceString(e));
    106             sendFailureStatus("io_exception");
    107             finish(Activity.RESULT_CANCELED, new Bundle());
    108         } catch (InterruptedException e) {
    109             Log.e(TAG, Log.getStackTraceString(e));
    110             sendFailureStatus("interrupted_exception");
    111             finish(Activity.RESULT_CANCELED, new Bundle());
    112         }
    113     }
    114 
    115     private ScanResult getScanResult(WifiManager wifiManager, String bssid) {
    116         List<ScanResult> scanResults = wifiManager.getScanResults();
    117         for (ScanResult scanResult : scanResults) {
    118             if (scanResult.BSSID.equals(bssid)) {
    119                 return scanResult;
    120             }
    121         }
    122 
    123         return null;
    124     }
    125 
    126     private void sendFailureStatus(String update) {
    127         Bundle result = new Bundle();
    128         result.putString("wifi_strength_scanner_failure", update);
    129         sendStatus(Activity.RESULT_CANCELED, result);
    130     }
    131 
    132     private Integer getRssiFromDumpsys(String bssid) throws IOException, InterruptedException {
    133         List<String> dumpsysLines = getDumpsysWifiLastScanResults();
    134 
    135         for (int i = 2; i < dumpsysLines.size(); i++) {
    136             String line = dumpsysLines.get(i);
    137             if (line != null && line.contains(bssid)) {
    138                 String[] tokens = line.trim().split("\\s\\s+");
    139                 return Integer.parseInt(tokens[2]);
    140             }
    141         }
    142 
    143         return INVALID_RSSI;
    144     }
    145 
    146     private List<String> getDumpsysWifiLastScanResults() throws IOException, InterruptedException {
    147         String dumpsysWifi = executeCommand("dumpsys wifi");
    148         String[] lines = dumpsysWifi.split("\n");
    149         List<String> scanResults = new ArrayList<>();
    150 
    151         boolean scansStarted = false;
    152         for (String line : lines) {
    153             if (line.startsWith("Latest scan results:")) {
    154                 scansStarted = true;
    155             }
    156 
    157             if (scansStarted) {
    158                 if ("".equals(line.trim())) {
    159                     break;
    160                 }
    161 
    162                 scanResults.add(line);
    163             }
    164         }
    165 
    166         return scanResults;
    167     }
    168 
    169     private String executeCommand(String cmd) throws IOException, InterruptedException {
    170         StringBuilder result = new StringBuilder();
    171         try {
    172             ParcelFileDescriptor pfd = getUiAutomation().executeShellCommand(cmd);
    173             byte[] buf = new byte[1024];
    174             int bytesRead;
    175             FileInputStream fis = new ParcelFileDescriptor.AutoCloseInputStream(pfd);
    176             while ((bytesRead = fis.read(buf)) != -1) {
    177                 result.append(new String(buf, 0, bytesRead));
    178             }
    179             fis.close();
    180         } catch (IOException e) {
    181             throw new IOException(String.format("Fails to execute command: %s ", cmd), e);
    182         }
    183 
    184         return result.toString();
    185     }
    186 
    187     private class WifiScanReceiver extends BroadcastReceiver {
    188         @Override
    189         public void onReceive(Context context, Intent intent) {
    190             Log.d(TAG, "scan results received.");
    191             scanReceived = true;
    192             mLatch.countDown();
    193         }
    194     }
    195 }
    196