/*
* Copyright (C) 2011 ZXing authors
*
* 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.google.zxing.client.android.wifi;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.AsyncTask;
import android.util.Log;
import java.util.List;
import java.util.regex.Pattern;
import com.google.zxing.client.result.WifiParsedResult;
/**
* @author Vikram Aggarwal
* @author Sean Owen
*/
public final class WifiConfigManager extends AsyncTask<WifiParsedResult,Object,Object> {
private static final String TAG = WifiConfigManager.class.getSimpleName();
private static final Pattern HEX_DIGITS = Pattern.compile("[0-9A-Fa-f]+");
private final WifiManager wifiManager;
public WifiConfigManager(WifiManager wifiManager) {
this.wifiManager = wifiManager;
}
@Override
protected Object doInBackground(WifiParsedResult... args) {
WifiParsedResult theWifiResult = args[0];
// Start WiFi, otherwise nothing will work
if (!wifiManager.isWifiEnabled()) {
Log.i(TAG, "Enabling wi-fi...");
if (wifiManager.setWifiEnabled(true)) {
Log.i(TAG, "Wi-fi enabled");
} else {
Log.w(TAG, "Wi-fi could not be enabled!");
return null;
}
// This happens very quickly, but need to wait for it to enable. A little busy wait?
int count = 0;
while (!wifiManager.isWifiEnabled()) {
if (count >= 10) {
Log.i(TAG, "Took too long to enable wi-fi, quitting");
return null;
}
Log.i(TAG, "Still waiting for wi-fi to enable...");
try {
Thread.sleep(1000L);
} catch (InterruptedException ie) {
// continue
}
count++;
}
}
String networkTypeString = theWifiResult.getNetworkEncryption();
NetworkType networkType;
try {
networkType = NetworkType.forIntentValue(networkTypeString);
} catch (IllegalArgumentException iae) {
Log.w(TAG, "Bad network type; see NetworkType values: " + networkTypeString);
return null;
}
if (networkType == NetworkType.NO_PASSWORD) {
changeNetworkUnEncrypted(wifiManager, theWifiResult);
} else {
String password = theWifiResult.getPassword();
if (password != null && password.length() != 0) {
if (networkType == NetworkType.WEP) {
changeNetworkWEP(wifiManager, theWifiResult);
} else if (networkType == NetworkType.WPA) {
changeNetworkWPA(wifiManager, theWifiResult);
}
}
}
return null;
}
/**
* Update the network: either create a new network or modify an existing network
* @param config the new network configuration
* @return network ID of the connected network.
*/
private static void updateNetwork(WifiManager wifiManager, WifiConfiguration config) {
Integer foundNetworkID = findNetworkInExistingConfig(wifiManager, config.SSID);
if (foundNetworkID != null) {
Log.i(TAG, "Removing old configuration for network " + config.SSID);
wifiManager.removeNetwork(foundNetworkID);
wifiManager.saveConfiguration();
}
int networkId = wifiManager.addNetwork(config);
if (networkId >= 0) {
// Try to disable the current network and start a new one.
if (wifiManager.enableNetwork(networkId, true)) {
Log.i(TAG, "Associating to network " + config.SSID);
wifiManager.saveConfiguration();
} else {
Log.w(TAG, "Failed to enable network " + config.SSID);
}
} else {
Log.w(TAG, "Unable to add network " + config.SSID);
}
}
private static WifiConfiguration changeNetworkCommon(WifiParsedResult wifiResult) {
WifiConfiguration config = new WifiConfiguration();
config.allowedAuthAlgorithms.clear();
config.allowedGroupCiphers.clear();
config.allowedKeyManagement.clear();
config.allowedPairwiseCiphers.clear();
config.allowedProtocols.clear();
// Android API insists that an ascii SSID must be quoted to be correctly handled.
config.SSID = quoteNonHex(wifiResult.getSsid());
config.hiddenSSID = wifiResult.isHidden();
return config;
}
// Adding a WEP network
private static void changeNetworkWEP(WifiManager wifiManager, WifiParsedResult wifiResult) {
WifiConfiguration config = changeNetworkCommon(wifiResult);
config.wepKeys[0] = quoteNonHex(wifiResult.getPassword(), 10, 26, 58);
config.wepTxKeyIndex = 0;
config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
updateNetwork(wifiManager, config);
}
// Adding a WPA or WPA2 network
private static void changeNetworkWPA(WifiManager wifiManager, WifiParsedResult wifiResult) {
WifiConfiguration config = changeNetworkCommon(wifiResult);
// Hex passwords that are 64 bits long are not to be quoted.
config.preSharedKey = quoteNonHex(wifiResult.getPassword(), 64);
config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
config.allowedProtocols.set(WifiConfiguration.Protocol.WPA); // For WPA
config.allowedProtocols.set(WifiConfiguration.Protocol.RSN); // For WPA2
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP);
config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
updateNetwork(wifiManager, config);
}
// Adding an open, unsecured network
private static void changeNetworkUnEncrypted(WifiManager wifiManager, WifiParsedResult wifiResult) {
WifiConfiguration config = changeNetworkCommon(wifiResult);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
updateNetwork(wifiManager, config);
}
private static Integer findNetworkInExistingConfig(WifiManager wifiManager, String ssid) {
List<WifiConfiguration> existingConfigs = wifiManager.getConfiguredNetworks();
for (WifiConfiguration existingConfig : existingConfigs) {
if (existingConfig.SSID.equals(ssid)) {
return existingConfig.networkId;
}
}
return null;
}
private static String quoteNonHex(String value, int... allowedLengths) {
return isHexOfLength(value, allowedLengths) ? value : convertToQuotedString(value);
}
/**
* Encloses the incoming string inside double quotes, if it isn't already quoted.
* @param string the input string
* @return a quoted string, of the form "input". If the input string is null, it returns null
* as well.
*/
private static String convertToQuotedString(String string) {
if (string == null || string.length() == 0) {
return null;
}
// If already quoted, return as-is
if (string.charAt(0) == '"' && string.charAt(string.length() - 1) == '"') {
return string;
}
return '\"' + string + '\"';
}
/**
* @param value input to check
* @param allowedLengths allowed lengths, if any
* @return true if value is a non-null, non-empty string of hex digits, and if allowed lengths are given, has
* an allowed length
*/
private static boolean isHexOfLength(CharSequence value, int... allowedLengths) {
if (value == null || !HEX_DIGITS.matcher(value).matches()) {
return false;
}
if (allowedLengths.length == 0) {
return true;
}
for (int length : allowedLengths) {
if (value.length() == length) {
return true;
}
}
return false;
}
}