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Use WifiManager for wifi backup/restore

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Use the newly exposed WifiManager API's for backing up/restoring wifi
related data. Remove all other wifi related logic from
SettingsBackupAgent.

There are 3 API's exposed by WifiManager for backup/restore:
1. retrieveBackupData - Data to be backed up in new format.
2. restoreBackupData - Restore from the new backup data format.
3. restoreOldBackupData - Restore from the old backup data format.

BUG: 29075035
BUG: 28967335
Change-Id: I2dc379bc36af0a0824ed51fbe9aaebfd0a0114b0
(cherry picked from commit 7a2491fa3b)
This commit is contained in:
Roshan Pius
2016-06-02 09:22:55 -07:00
committed by Mitchell Wills
parent e90e0a74ad
commit 1bf869887d
1 changed files with 81 additions and 576 deletions
Download Patch File Download Diff File Expand all files Collapse all files

657
packages/SettingsProvider/src/com/android/providers/settings/SettingsBackupAgent.java
View File

@@ -28,12 +28,9 @@ import android.net.NetworkPolicy;
import android.net.NetworkPolicyManager;
import android.net.Uri;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiConfiguration.KeyMgmt;
import android.net.wifi.WifiManager;
import android.os.FileUtils;
import android.os.Handler;
import android.os.ParcelFileDescriptor;
import android.os.Process;
import android.os.UserHandle;
import android.provider.Settings;
import android.util.BackupUtils;
@@ -41,34 +38,19 @@ import android.util.Log;
import com.android.internal.widget.LockPatternUtils;
import libcore.io.IoUtils;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.CharArrayReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.zip.CRC32;
/**
@@ -86,10 +68,11 @@ public class SettingsBackupAgent extends BackupAgentHelper {
private static final String KEY_LOCK_SETTINGS = "lock_settings";
private static final String KEY_SOFTAP_CONFIG = "softap_config";
private static final String KEY_NETWORK_POLICIES = "network_policies";
private static final String KEY_WIFI_NEW_CONFIG = "wifi_new_config";
// Versioning of the state file. Increment this version
// number any time the set of state items is altered.
private static final int STATE_VERSION = 6;
private static final int STATE_VERSION = 7;
// Versioning of the Network Policies backup payload.
private static final int NETWORK_POLICIES_BACKUP_VERSION = 1;
@@ -106,8 +89,9 @@ public class SettingsBackupAgent extends BackupAgentHelper {
private static final int STATE_LOCK_SETTINGS = 6;
private static final int STATE_SOFTAP_CONFIG = 7;
private static final int STATE_NETWORK_POLICIES = 8;
private static final int STATE_WIFI_NEW_CONFIG = 9;
private static final int STATE_SIZE = 9; // The current number of state items
private static final int STATE_SIZE = 10; // The current number of state items
// Number of entries in the checksum array at various version numbers
private static final int STATE_SIZES[] = {
@@ -117,16 +101,18 @@ public class SettingsBackupAgent extends BackupAgentHelper {
6, // version 3 added STATE_GLOBAL
7, // version 4 added STATE_LOCK_SETTINGS
8, // version 5 added STATE_SOFTAP_CONFIG
STATE_SIZE // version 6 added STATE_NETWORK_POLICIES
9, // version 6 added STATE_NETWORK_POLICIES
STATE_SIZE // version 7 added STATE_WIFI_NEW_CONFIG
};
// Versioning of the 'full backup' format
// Increment this version any time a new item is added
private static final int FULL_BACKUP_VERSION = 5;
private static final int FULL_BACKUP_VERSION = 6;
private static final int FULL_BACKUP_ADDED_GLOBAL = 2; // added the "global" entry
private static final int FULL_BACKUP_ADDED_LOCK_SETTINGS = 3; // added the "lock_settings" entry
private static final int FULL_BACKUP_ADDED_SOFTAP_CONF = 4; //added the "softap_config" entry
private static final int FULL_BACKUP_ADDED_NETWORK_POLICIES = 5; //added "network_policies"
private static final int FULL_BACKUP_ADDED_WIFI_NEW = 6; // added "wifi_new_config" entry
private static final int INTEGER_BYTE_COUNT = Integer.SIZE / Byte.SIZE;
@@ -139,10 +125,6 @@ public class SettingsBackupAgent extends BackupAgentHelper {
Settings.NameValueTable.VALUE
};
private static final String FILE_WIFI_SUPPLICANT = "/data/misc/wifi/wpa_supplicant.conf";
private static final String FILE_WIFI_SUPPLICANT_TEMPLATE =
"/system/etc/wifi/wpa_supplicant.conf";
// the key to store the WIFI data under, should be sorted as last, so restore happens last.
// use very late unicode character to quasi-guarantee last sort position.
private static final String KEY_WIFI_SUPPLICANT = "\uffedWIFI";
@@ -156,259 +138,17 @@ public class SettingsBackupAgent extends BackupAgentHelper {
// stored in the full-backup tarfile as well, so should not be changed.
private static final String STAGE_FILE = "flattened-data";
// Delay in milliseconds between the restore operation and when we will bounce
// wifi in order to rewrite the supplicant config etc.
private static final long WIFI_BOUNCE_DELAY_MILLIS = 60 * 1000; // one minute
private SettingsHelper mSettingsHelper;
private WifiManager mWfm;
private String mWifiConfigFile;
// Chain of asynchronous operations used when rewriting the wifi supplicant config file
WifiDisableRunnable mWifiDisable = null;
WifiRestoreRunnable mWifiRestore = null;
int mRetainedWifiState; // used only during config file rewrite
// Class for capturing a network definition from the wifi supplicant config file
static class Network {
String ssid = ""; // equals() and hashCode() need these to be non-null
String key_mgmt = "";
boolean certUsed = false;
boolean hasWepKey = false;
boolean isEap = false;
final ArrayList<String> rawLines = new ArrayList<String>();
public static Network readFromStream(BufferedReader in) {
final Network n = new Network();
String line;
try {
while (in.ready()) {
line = in.readLine();
if (line == null || line.startsWith("}")) {
break;
}
n.rememberLine(line);
}
} catch (IOException e) {
return null;
}
return n;
}
void rememberLine(String line) {
// can't rely on particular whitespace patterns so strip leading/trailing
line = line.trim();
if (line.isEmpty()) return; // only whitespace; drop the line
rawLines.add(line);
// remember the ssid and key_mgmt lines for duplicate culling
if (line.startsWith("ssid=")) {
ssid = line;
} else if (line.startsWith("key_mgmt=")) {
key_mgmt = line;
if (line.contains("EAP")) {
isEap = true;
}
} else if (line.startsWith("client_cert=")) {
certUsed = true;
} else if (line.startsWith("ca_cert=")) {
certUsed = true;
} else if (line.startsWith("ca_path=")) {
certUsed = true;
} else if (line.startsWith("wep_")) {
hasWepKey = true;
} else if (line.startsWith("eap=")) {
isEap = true;
}
}
public void write(Writer w) throws IOException {
w.write("\nnetwork={\n");
for (String line : rawLines) {
w.write("\t" + line + "\n");
}
w.write("}\n");
}
public void dump() {
Log.v(TAG, "network={");
for (String line : rawLines) {
Log.v(TAG, " " + line);
}
Log.v(TAG, "}");
}
// Calculate the equivalent of WifiConfiguration's configKey()
public String configKey() {
if (ssid == null) {
// No SSID => malformed network definition
return null;
}
final String bareSsid = ssid.substring(ssid.indexOf('=') + 1);
final BitSet types = new BitSet();
if (key_mgmt == null) {
// no key_mgmt specified; this is defined as equivalent to "WPA-PSK WPA-EAP"
types.set(KeyMgmt.WPA_PSK);
types.set(KeyMgmt.WPA_EAP);
} else {
// Need to parse the key_mgmt line
final String bareKeyMgmt = key_mgmt.substring(key_mgmt.indexOf('=') + 1);
String[] typeStrings = bareKeyMgmt.split("\\s+");
// Parse out all the key management regimes permitted for this network. The literal
// strings here are the standard values permitted in wpa_supplicant.conf.
for (int i = 0; i < typeStrings.length; i++) {
final String ktype = typeStrings[i];
if (ktype.equals("WPA-PSK")) {
Log.v(TAG, " + setting WPA_PSK bit");
types.set(KeyMgmt.WPA_PSK);
} else if (ktype.equals("WPA-EAP")) {
Log.v(TAG, " + setting WPA_EAP bit");
types.set(KeyMgmt.WPA_EAP);
} else if (ktype.equals("IEEE8021X")) {
Log.v(TAG, " + setting IEEE8021X bit");
types.set(KeyMgmt.IEEE8021X);
}
}
}
// Now build the canonical config key paralleling the WifiConfiguration semantics
final String key;
if (types.get(KeyMgmt.WPA_PSK)) {
key = bareSsid + KeyMgmt.strings[KeyMgmt.WPA_PSK];
} else if (types.get(KeyMgmt.WPA_EAP) || types.get(KeyMgmt.IEEE8021X)) {
key = bareSsid + KeyMgmt.strings[KeyMgmt.WPA_EAP];
} else if (hasWepKey) {
key = bareSsid + "WEP"; // hardcoded this way in WifiConfiguration
} else {
key = bareSsid + KeyMgmt.strings[KeyMgmt.NONE];
}
return key;
}
// Same approach as Pair.equals() and Pair.hashCode()
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (!(o instanceof Network)) return false;
final Network other;
try {
other = (Network) o;
} catch (ClassCastException e) {
return false;
}
return ssid.equals(other.ssid) && key_mgmt.equals(other.key_mgmt);
}
@Override
public int hashCode() {
int result = 17;
result = 31 * result + ssid.hashCode();
result = 31 * result + key_mgmt.hashCode();
return result;
}
}
boolean networkInWhitelist(Network net, List<WifiConfiguration> whitelist) {
final String netConfigKey = net.configKey();
final int N = whitelist.size();
for (int i = 0; i < N; i++) {
if (Objects.equals(netConfigKey, whitelist.get(i).configKey(true))) {
return true;
}
}
return false;
}
// Ingest multiple wifi config file fragments, looking for network={} blocks
// and eliminating duplicates
class WifiNetworkSettings {
// One for fast lookup, one for maintaining ordering
final HashSet<Network> mKnownNetworks = new HashSet<Network>();
final ArrayList<Network> mNetworks = new ArrayList<Network>(8);
public void readNetworks(BufferedReader in, List<WifiConfiguration> whitelist,
boolean acceptEapNetworks) {
try {
String line;
while (in.ready()) {
line = in.readLine();
if (line != null) {
// Parse out 'network=' decls so we can ignore duplicates
if (line.startsWith("network")) {
Network net = Network.readFromStream(in);
if (whitelist != null) {
if (!networkInWhitelist(net, whitelist)) {
if (DEBUG_BACKUP) {
Log.v(TAG, "Network not in whitelist, skipping: "
+ net.ssid + " / " + net.key_mgmt);
}
continue;
}
}
// Don't propagate EAP network definitions
if (net.isEap && !acceptEapNetworks) {
if (DEBUG_BACKUP) {
Log.v(TAG, "Skipping EAP network " + net.ssid + " / " + net.key_mgmt);
}
continue;
}
if (!mKnownNetworks.contains(net)) {
if (DEBUG_BACKUP) {
Log.v(TAG, "Adding " + net.ssid + " / " + net.key_mgmt);
}
mKnownNetworks.add(net);
mNetworks.add(net);
} else {
if (DEBUG_BACKUP) {
Log.v(TAG, "Dupe; skipped " + net.ssid + " / " + net.key_mgmt);
}
}
}
}
}
} catch (IOException e) {
// whatever happened, we're done now
}
}
public void write(Writer w) throws IOException {
for (Network net : mNetworks) {
if (net.certUsed) {
// Networks that use certificates for authentication can't be restored
// because the certificates they need don't get restored (because they
// are stored in keystore, and can't be restored)
continue;
}
if (net.isEap) {
// Similarly, omit EAP network definitions to avoid propagating
// controlled enterprise network definitions.
continue;
}
net.write(w);
}
}
public void dump() {
for (Network net : mNetworks) {
net.dump();
}
}
}
private WifiManager mWifiManager;
@Override
public void onCreate() {
if (DEBUG_BACKUP) Log.d(TAG, "onCreate() invoked");
mSettingsHelper = new SettingsHelper(this);
mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
super.onCreate();
WifiManager mWfm = (WifiManager) getSystemService(Context.WIFI_SERVICE);
if (mWfm != null) mWifiConfigFile = mWfm.getConfigFile();
}
@Override
@@ -420,10 +160,9 @@ public class SettingsBackupAgent extends BackupAgentHelper {
byte[] globalSettingsData = getGlobalSettings();
byte[] lockSettingsData = getLockSettings();
byte[] locale = mSettingsHelper.getLocaleData();
byte[] wifiSupplicantData = getWifiSupplicant(FILE_WIFI_SUPPLICANT);
byte[] wifiConfigData = getFileData(mWifiConfigFile);
byte[] softApConfigData = getSoftAPConfiguration();
byte[] netPoliciesData = getNetworkPolicies();
byte[] wifiFullConfigData = getNewWifiConfigData();
long[] stateChecksums = readOldChecksums(oldState);
@@ -435,12 +174,8 @@ public class SettingsBackupAgent extends BackupAgentHelper {
writeIfChanged(stateChecksums[STATE_GLOBAL], KEY_GLOBAL, globalSettingsData, data);
stateChecksums[STATE_LOCALE] =
writeIfChanged(stateChecksums[STATE_LOCALE], KEY_LOCALE, locale, data);
stateChecksums[STATE_WIFI_SUPPLICANT] =
writeIfChanged(stateChecksums[STATE_WIFI_SUPPLICANT], KEY_WIFI_SUPPLICANT,
wifiSupplicantData, data);
stateChecksums[STATE_WIFI_CONFIG] =
writeIfChanged(stateChecksums[STATE_WIFI_CONFIG], KEY_WIFI_CONFIG, wifiConfigData,
data);
stateChecksums[STATE_WIFI_SUPPLICANT] = 0;
stateChecksums[STATE_WIFI_CONFIG] = 0;
stateChecksums[STATE_LOCK_SETTINGS] =
writeIfChanged(stateChecksums[STATE_LOCK_SETTINGS], KEY_LOCK_SETTINGS,
lockSettingsData, data);
@@ -450,112 +185,13 @@ public class SettingsBackupAgent extends BackupAgentHelper {
stateChecksums[STATE_NETWORK_POLICIES] =
writeIfChanged(stateChecksums[STATE_NETWORK_POLICIES], KEY_NETWORK_POLICIES,
netPoliciesData, data);
stateChecksums[STATE_WIFI_NEW_CONFIG] =
writeIfChanged(stateChecksums[STATE_WIFI_NEW_CONFIG], KEY_WIFI_NEW_CONFIG,
wifiFullConfigData, data);
writeNewChecksums(stateChecksums, newState);
}
class WifiDisableRunnable implements Runnable {
final WifiRestoreRunnable mNextPhase;
public WifiDisableRunnable(WifiRestoreRunnable next) {
mNextPhase = next;
}
@Override
public void run() {
if (DEBUG_BACKUP) {
Log.v(TAG, "Disabling wifi during restore");
}
final ContentResolver cr = getContentResolver();
final int scanAlways = Settings.Global.getInt(cr,
Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0);
final int retainedWifiState = enableWifi(false);
if (scanAlways != 0) {
Settings.Global.putInt(cr,
Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0);
}
// Tell the final stage how to clean up after itself
mNextPhase.setPriorState(retainedWifiState, scanAlways);
// And run it after a modest pause to give broadcasts and content
// observers time an opportunity to run on this looper thread, so
// that the wifi stack actually goes all the way down.
new Handler(getMainLooper()).postDelayed(mNextPhase, 2500);
}
}
class WifiRestoreRunnable implements Runnable {
private byte[] restoredSupplicantData;
private byte[] restoredWifiConfigFile;
private int retainedWifiState; // provided by disable stage
private int scanAlways; // provided by disable stage
void setPriorState(int retainedState, int always) {
retainedWifiState = retainedState;
scanAlways = always;
}
void incorporateWifiSupplicant(BackupDataInput data) {
restoredSupplicantData = new byte[data.getDataSize()];
if (restoredSupplicantData.length <= 0) return;
try {
data.readEntityData(restoredSupplicantData, 0, data.getDataSize());
} catch (IOException e) {
Log.w(TAG, "Unable to read supplicant data");
restoredSupplicantData = null;
}
}
void incorporateWifiConfigFile(BackupDataInput data) {
restoredWifiConfigFile = new byte[data.getDataSize()];
if (restoredWifiConfigFile.length <= 0) return;
try {
data.readEntityData(restoredWifiConfigFile, 0, data.getDataSize());
} catch (IOException e) {
Log.w(TAG, "Unable to read config file");
restoredWifiConfigFile = null;
}
}
@Override
public void run() {
if (restoredSupplicantData != null || restoredWifiConfigFile != null) {
if (DEBUG_BACKUP) {
Log.v(TAG, "Applying restored wifi data");
}
if (restoredSupplicantData != null) {
restoreWifiSupplicant(FILE_WIFI_SUPPLICANT,
restoredSupplicantData, restoredSupplicantData.length);
FileUtils.setPermissions(FILE_WIFI_SUPPLICANT,
FileUtils.S_IRUSR | FileUtils.S_IWUSR
| FileUtils.S_IRGRP | FileUtils.S_IWGRP,
Process.myUid(), Process.WIFI_UID);
}
if (restoredWifiConfigFile != null) {
restoreFileData(mWifiConfigFile,
restoredWifiConfigFile, restoredWifiConfigFile.length);
}
// restore the previous WIFI state.
if (scanAlways != 0) {
Settings.Global.putInt(getContentResolver(),
Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, scanAlways);
}
enableWifi(retainedWifiState == WifiManager.WIFI_STATE_ENABLED
|| retainedWifiState == WifiManager.WIFI_STATE_ENABLING);
}
}
}
// Instantiate the wifi-config restore runnable, scheduling it for execution
// a minute hence
void initWifiRestoreIfNecessary() {
if (mWifiRestore == null) {
mWifiRestore = new WifiRestoreRunnable();
mWifiDisable = new WifiDisableRunnable(mWifiRestore);
}
}
@Override
public void onRestore(BackupDataInput data, int appVersionCode,
ParcelFileDescriptor newState) throws IOException {
@@ -563,6 +199,8 @@ public class SettingsBackupAgent extends BackupAgentHelper {
HashSet<String> movedToGlobal = new HashSet<String>();
Settings.System.getMovedToGlobalSettings(movedToGlobal);
Settings.Secure.getMovedToGlobalSettings(movedToGlobal);
byte[] restoredWifiSupplicantData = null;
byte[] restoredWifiIpConfigData = null;
while (data.readNextHeader()) {
final String key = data.getKey();
@@ -582,8 +220,8 @@ public class SettingsBackupAgent extends BackupAgentHelper {
break;
case KEY_WIFI_SUPPLICANT :
initWifiRestoreIfNecessary();
mWifiRestore.incorporateWifiSupplicant(data);
restoredWifiSupplicantData = new byte[size];
data.readEntityData(restoredWifiSupplicantData, 0, size);
break;
case KEY_LOCALE :
@@ -593,8 +231,8 @@ public class SettingsBackupAgent extends BackupAgentHelper {
break;
case KEY_WIFI_CONFIG :
initWifiRestoreIfNecessary();
mWifiRestore.incorporateWifiConfigFile(data);
restoredWifiIpConfigData = new byte[size];
data.readEntityData(restoredWifiIpConfigData, 0, size);
break;
case KEY_LOCK_SETTINGS :
@@ -613,23 +251,23 @@ public class SettingsBackupAgent extends BackupAgentHelper {
restoreNetworkPolicies(netPoliciesData);
break;
case KEY_WIFI_NEW_CONFIG:
byte[] restoredWifiNewConfigData = new byte[size];
data.readEntityData(restoredWifiNewConfigData, 0, size);
restoreNewWifiConfigData(restoredWifiNewConfigData, size);
break;
default :
data.skipEntityData();
}
}
// If we have wifi data to restore, post a runnable to perform the
// bounce-and-update operation a little ways in the future. The
// 'disable' runnable brings down the stack and remembers its state,
// and in turn schedules the 'restore' runnable to do the rewrite
// and cleanup operations.
if (mWifiRestore != null) {
long wifiBounceDelayMillis = Settings.Global.getLong(
getContentResolver(),
Settings.Global.WIFI_BOUNCE_DELAY_OVERRIDE_MS,
WIFI_BOUNCE_DELAY_MILLIS);
new Handler(getMainLooper()).postDelayed(mWifiDisable, wifiBounceDelayMillis);
// Do this at the end so that we also pull in the ipconfig data.
if (restoredWifiSupplicantData != null) {
restoreSupplicantWifiConfigData(
restoredWifiSupplicantData, restoredWifiSupplicantData.length,
restoredWifiIpConfigData, restoredWifiIpConfigData.length);
}
}
@@ -640,10 +278,9 @@ public class SettingsBackupAgent extends BackupAgentHelper {
byte[] globalSettingsData = getGlobalSettings();
byte[] lockSettingsData = getLockSettings();
byte[] locale = mSettingsHelper.getLocaleData();
byte[] wifiSupplicantData = getWifiSupplicant(FILE_WIFI_SUPPLICANT);
byte[] wifiConfigData = getFileData(mWifiConfigFile);
byte[] softApConfigData = getSoftAPConfiguration();
byte[] netPoliciesData = getNetworkPolicies();
byte[] wifiFullConfigData = getNewWifiConfigData();
// Write the data to the staging file, then emit that as our tarfile
// representation of the backed-up settings.
@@ -673,14 +310,6 @@ public class SettingsBackupAgent extends BackupAgentHelper {
if (DEBUG_BACKUP) Log.d(TAG, locale.length + " bytes of locale data");
out.writeInt(locale.length);
out.write(locale);
if (DEBUG_BACKUP) {
Log.d(TAG, wifiSupplicantData.length + " bytes of wifi supplicant data");
}
out.writeInt(wifiSupplicantData.length);
out.write(wifiSupplicantData);
if (DEBUG_BACKUP) Log.d(TAG, wifiConfigData.length + " bytes of wifi config data");
out.writeInt(wifiConfigData.length);
out.write(wifiConfigData);
if (DEBUG_BACKUP) Log.d(TAG, lockSettingsData.length + " bytes of lock settings data");
out.writeInt(lockSettingsData.length);
out.write(lockSettingsData);
@@ -690,6 +319,11 @@ public class SettingsBackupAgent extends BackupAgentHelper {
if (DEBUG_BACKUP) Log.d(TAG, netPoliciesData.length + " bytes of net policies data");
out.writeInt(netPoliciesData.length);
out.write(netPoliciesData);
if (DEBUG_BACKUP) {
Log.d(TAG, wifiFullConfigData.length + " bytes of wifi config data");
}
out.writeInt(wifiFullConfigData.length);
out.write(wifiFullConfigData);
out.flush(); // also flushes downstream
@@ -750,27 +384,22 @@ public class SettingsBackupAgent extends BackupAgentHelper {
in.readFully(buffer, 0, nBytes);
mSettingsHelper.setLocaleData(buffer, nBytes);
// wifi supplicant
nBytes = in.readInt();
if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of wifi supplicant data");
if (nBytes > buffer.length) buffer = new byte[nBytes];
in.readFully(buffer, 0, nBytes);
int retainedWifiState = enableWifi(false);
restoreWifiSupplicant(FILE_WIFI_SUPPLICANT, buffer, nBytes);
FileUtils.setPermissions(FILE_WIFI_SUPPLICANT,
FileUtils.S_IRUSR | FileUtils.S_IWUSR
| FileUtils.S_IRGRP | FileUtils.S_IWGRP,
Process.myUid(), Process.WIFI_UID);
// retain the previous WIFI state.
enableWifi(retainedWifiState == WifiManager.WIFI_STATE_ENABLED
|| retainedWifiState == WifiManager.WIFI_STATE_ENABLING);
// Restore older backups performing the necessary migrations.
if (version < FULL_BACKUP_ADDED_WIFI_NEW) {
// wifi supplicant
int supplicant_size = in.readInt();
if (DEBUG_BACKUP) Log.d(TAG, supplicant_size + " bytes of wifi supplicant data");
byte[] supplicant_buffer = new byte[supplicant_size];
in.readFully(supplicant_buffer, 0, supplicant_size);
// wifi config
nBytes = in.readInt();
if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of wifi config data");
if (nBytes > buffer.length) buffer = new byte[nBytes];
in.readFully(buffer, 0, nBytes);
restoreFileData(mWifiConfigFile, buffer, nBytes);
// ip config
int ipconfig_size = in.readInt();
if (DEBUG_BACKUP) Log.d(TAG, ipconfig_size + " bytes of ip config data");
byte[] ipconfig_buffer = new byte[ipconfig_size];
in.readFully(ipconfig_buffer, 0, nBytes);
restoreSupplicantWifiConfigData(supplicant_buffer, supplicant_size, ipconfig_buffer,
ipconfig_size);
}
if (version >= FULL_BACKUP_ADDED_LOCK_SETTINGS) {
nBytes = in.readInt();
@@ -801,6 +430,15 @@ public class SettingsBackupAgent extends BackupAgentHelper {
restoreNetworkPolicies(buffer);
}
}
// Restore full wifi config data
if (version >= FULL_BACKUP_ADDED_WIFI_NEW) {
nBytes = in.readInt();
if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of full wifi config data");
if (nBytes > buffer.length) buffer = new byte[nBytes];
in.readFully(buffer, 0, nBytes);
restoreNewWifiConfigData(buffer, nBytes);
}
if (DEBUG_BACKUP) Log.d(TAG, "Full restore complete.");
} else {
data.close();
@@ -1114,146 +752,17 @@ public class SettingsBackupAgent extends BackupAgentHelper {
return result;
}
private byte[] getFileData(String filename) {
InputStream is = null;
try {
File file = new File(filename);
is = new FileInputStream(file);
//Will truncate read on a very long file,
//should not happen for a config file
byte[] bytes = new byte[(int) file.length()];
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
offset += numRead;
}
//read failure
if (offset < bytes.length) {
Log.w(TAG, "Couldn't backup " + filename);
return EMPTY_DATA;
}
return bytes;
} catch (IOException ioe) {
Log.w(TAG, "Couldn't backup " + filename);
return EMPTY_DATA;
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
}
}
private void restoreFileData(String filename, byte[] bytes, int size) {
try {
File file = new File(filename);
if (file.exists()) file.delete();
OutputStream os = new BufferedOutputStream(new FileOutputStream(filename, true));
os.write(bytes, 0, size);
os.close();
} catch (IOException ioe) {
Log.w(TAG, "Couldn't restore " + filename);
}
}
private byte[] getWifiSupplicant(String filename) {
BufferedReader br = null;
try {
File file = new File(filename);
if (!file.exists()) {
return EMPTY_DATA;
}
WifiManager wifi = (WifiManager) getSystemService(WIFI_SERVICE);
List<WifiConfiguration> configs = wifi.getConfiguredNetworks();
WifiNetworkSettings fromFile = new WifiNetworkSettings();
br = new BufferedReader(new FileReader(file));
fromFile.readNetworks(br, configs, false);
// Write the parsed networks into a packed byte array
if (fromFile.mKnownNetworks.size() > 0) {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
OutputStreamWriter out = new OutputStreamWriter(bos);
fromFile.write(out);
out.flush();
return bos.toByteArray();
} else {
return EMPTY_DATA;
}
} catch (IOException ioe) {
Log.w(TAG, "Couldn't backup " + filename);
return EMPTY_DATA;
} finally {
IoUtils.closeQuietly(br);
}
}
private void restoreWifiSupplicant(String filename, byte[] bytes, int size) {
try {
WifiNetworkSettings supplicantImage = new WifiNetworkSettings();
File supplicantFile = new File(FILE_WIFI_SUPPLICANT);
if (supplicantFile.exists()) {
// Retain the existing APs; we'll append the restored ones to them
BufferedReader in = new BufferedReader(new FileReader(FILE_WIFI_SUPPLICANT));
supplicantImage.readNetworks(in, null, true);
in.close();
supplicantFile.delete();
}
// Incorporate the restore AP information
if (size > 0) {
char[] restoredAsBytes = new char[size];
for (int i = 0; i < size; i++) restoredAsBytes[i] = (char) bytes[i];
BufferedReader in = new BufferedReader(new CharArrayReader(restoredAsBytes));
supplicantImage.readNetworks(in, null, false);
if (DEBUG_BACKUP) {
Log.v(TAG, "Final AP list:");
supplicantImage.dump();
}
}
// Install the correct default template
BufferedWriter bw = new BufferedWriter(new FileWriter(FILE_WIFI_SUPPLICANT));
copyWifiSupplicantTemplate(bw);
// Write the restored supplicant config and we're done
supplicantImage.write(bw);
bw.close();
} catch (IOException ioe) {
Log.w(TAG, "Couldn't restore " + filename);
}
}
private void copyWifiSupplicantTemplate(BufferedWriter bw) {
try {
BufferedReader br = new BufferedReader(new FileReader(FILE_WIFI_SUPPLICANT_TEMPLATE));
char[] temp = new char[1024];
int size;
while ((size = br.read(temp)) > 0) {
bw.write(temp, 0, size);
}
br.close();
} catch (IOException ioe) {
Log.w(TAG, "Couldn't copy wpa_supplicant file");
private void restoreSupplicantWifiConfigData(byte[] supplicant_bytes, int supplicant_size,
byte[] ipconfig_bytes, int ipconfig_size) {
if (DEBUG_BACKUP) {
Log.v(TAG, "Applying restored supplicant wifi data");
}
mWifiManager.restoreSupplicantBackupData(supplicant_bytes, ipconfig_bytes);
}
private byte[] getSoftAPConfiguration() {
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
try {
return wifiManager.getWifiApConfiguration().getBytesForBackup();
return mWifiManager.getWifiApConfiguration().getBytesForBackup();
} catch (IOException ioe) {
Log.e(TAG, "Failed to marshal SoftAPConfiguration" + ioe.getMessage());
return new byte[0];
@@ -1261,12 +770,11 @@ public class SettingsBackupAgent extends BackupAgentHelper {
}
private void restoreSoftApConfiguration(byte[] data) {
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
try {
WifiConfiguration config = WifiConfiguration
.getWifiConfigFromBackup(new DataInputStream(new ByteArrayInputStream(data)));
if (DEBUG) Log.d(TAG, "Successfully unMarshaled WifiConfiguration ");
wifiManager.setWifiApConfiguration(config);
mWifiManager.setWifiApConfiguration(config);
} catch (IOException | BackupUtils.BadVersionException e) {
Log.e(TAG, "Failed to unMarshal SoftAPConfiguration " + e.getMessage());
}
@@ -1300,6 +808,17 @@ public class SettingsBackupAgent extends BackupAgentHelper {
return baos.toByteArray();
}
private byte[] getNewWifiConfigData() {
return mWifiManager.retrieveBackupData();
}
private void restoreNewWifiConfigData(byte[] bytes, int size) {
if (DEBUG_BACKUP) {
Log.v(TAG, "Applying restored wifi data");
}
mWifiManager.restoreBackupData(bytes);
}
private void restoreNetworkPolicies(byte[] data) {
NetworkPolicyManager networkPolicyManager =
(NetworkPolicyManager) getSystemService(NETWORK_POLICY_SERVICE);
@@ -1358,18 +877,4 @@ public class SettingsBackupAgent extends BackupAgentHelper {
| ((in[pos + 3] & 0xFF) << 0);
return result;
}
private int enableWifi(boolean enable) {
if (mWfm == null) {
mWfm = (WifiManager) getSystemService(Context.WIFI_SERVICE);
}
if (mWfm != null) {
int state = mWfm.getWifiState();
mWfm.setWifiEnabled(enable);
return state;
} else {
Log.e(TAG, "Failed to fetch WifiManager instance");
}
return WifiManager.WIFI_STATE_UNKNOWN;
}
}