android wifi mac 随机

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mob6454cc70cb6b 2024-09-04 10:07:06

文章标签 android wifi mac 随机 java 安卓 android xml 文章分类 Android 移动开发

AOSP Settings WIFI随机MAC地址功能

背景

最近客户提出了想要实现随机WIFIMAC地址的功能（我们默认WIFI的MAC地址是固定的）。网上搜到了一篇不错的文章，本次改动也是基于这个来写的。
由于客户指定使用的settings是AOSP的，所以在AOSP Settings上改动。
看了一下，其实Amlogic提供的settings在这部分的代码量少多了。更好修改。

一、配置文件属性决定全局开启/关闭WIFI随机MAC

如果是需要固定死开启/关闭WIFI随机MAC，只需要改动下面这个文件就可以了。
frameworks/opt/net/wifi/service/res/values/config.xml

//WiFi MAC 是否随机设置
<!-- Indicates that connected MAC randomization is supported on this device -->
<bool translatable="false" name="config_wifi_connected_mac_randomization_supported">true</bool>

//AP （一般是投屏） MAC 是否随机设置
<!-- Indicates that p2p MAC randomization is supported on this device -->
<bool translatable="false" name="config_wifi_p2p_mac_randomization_supported">false</bool>

//AP （一般是热点） MAC 是否随机设置
<!-- Indicates that AP mode MAC randomization is supported on this device -->
<bool translatable="false" name="config_wifi_ap_mac_randomization_supported">true</bool>

不过这样做只能定死，不能随用户心情改动。
这个文件一旦编译完成就不可以更改。
因此需要把这个判断逻辑改掉，不用它判断。

二、修改判断逻辑为prop属性

由于我们要新增加一个prop属性，所以写属性的读取属性的方法都要写。

frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeImpl.java 这个函数是判断资源文件中是否随机WIFI MAC的位置

/**
 * Helper method to check if Connected MAC Randomization is supported - onDown events are
 * skipped if this feature is enabled (b/72459123).
 *
 * @return boolean true if Connected MAC randomization is supported, false otherwise
 */
public boolean isConnectedMacRandomizationEnabled() {
        return mContext.getResources().getBoolean(                    
        R.bool.config_wifi_connected_mac_randomization_supported);
}

我们将其修改成判断prop属性：

--- a/frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeImpl.java
+++ b/frameworks/opt/net/wifi/service/java/com/android/server/wifi/ClientModeImpl.java
@@ -153,6 +153,7 @@ import java.util.List;
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
+import android.os.SystemProperties;


@@ -210,6 +211,7 @@ public class ClientModeImpl extends StateMachine {
     protected void log(String s) {
         Log.d(getName(), s);
     }
+    private static final String PROP_MAC_RANDOMIZATION = "persist.mac_randomization_enabled";
     private final WifiMetrics mWifiMetrics;
     private final WifiInjector mWifiInjector;
     private final WifiMonitor mWifiMonitor;
@@ -3334,8 +3336,7 @@ public class ClientModeImpl extends StateMachine {
     public boolean isConnectedMacRandomizationEnabled() {
-        return mContext.getResources().getBoolean(
-                R.bool.config_wifi_connected_mac_randomization_supported);
+           return SystemProperties.getBoolean(PROP_MAC_RANDOMIZATION, false);
     }

还有一个地方也涉及到随机WIFI MAC的判断

--- a/frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiConfigManager.java
+++ b/frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiConfigManager.java
@@ -75,6 +75,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import android.os.SystemProperties;

 
@@ -329,6 +330,7 @@ public class WifiConfigManager {
     private final NetworkListSharedStoreData mNetworkListSharedStoreData;
     private final NetworkListUserStoreData mNetworkListUserStoreData;
     private final RandomizedMacStoreData mRandomizedMacStoreData;
+    private static final String PROP_MAC_RANDOMIZATION = "persist.mac_randomization_enabled";


@@ -645,10 +647,10 @@ public class WifiConfigManager {
      * Returns whether MAC randomization is supported on this device.
      * @param config
      * @return
+     * modified by zhangt 2024.02.19
      */
     private boolean isMacRandomizationSupported() {
-        return mContext.getResources().getBoolean(
-                R.bool.config_wifi_connected_mac_randomization_supported);
+           return SystemProperties.getBoolean(PROP_MAC_RANDOMIZATION, false);
     }

我是在同时修改上面两处内容后才成功的。

三、在WIFI 详细内容界面增加Switch开关用来开启关闭该功能

packages/apps/Settings/res/xml/wifi_network_details_fragment2.xml
--- a/packages/apps/Settings/res/xml/wifi_network_details_fragment2.xml
+++ b/packages/apps/Settings/res/xml/wifi_network_details_fragment2.xml
@@ -83,6 +83,12 @@
         android:summary="@string/wifi_subscription_summary"
         settings:allowDividerAbove="true"/>

+    <SwitchPreference
+        android:key="random_mac_address_switch"
+        android:title="@string/random_mac_address_title"
+        android:summary="@string/random_mac_address_summary"
+        android:defaultValue="false" />
+

这里WIFI 详细内容界面的xml文件是上面这个。
然后我们要在这个界面的具体逻辑代码中进行实现。

--- a/packages/apps/Settings/src/com/android/settings/wifi/details2/WifiNetworkDetailsFragment2.java
+++ b/packages/apps/Settings/src/com/android/settings/wifi/details2/WifiNetworkDetailsFragment2.java
@@ -55,6 +55,10 @@ import java.time.Clock;
 import java.time.ZoneOffset;
 import java.util.ArrayList;
 import java.util.List;
+import android.os.SystemProperties;
+import androidx.preference.SwitchPreference;
+import androidx.preference.Preference;
+import android.os.Bundle;

@@ -75,6 +79,12 @@ public class WifiNetworkDetailsFragment2 extends DashboardFragment implements
     // Interval between initiating SavedNetworkTracker scans
     private static final long SCAN_INTERVAL_MILLIS = 10_000;

+    private WifiManager wifiManager;
+    private SwitchPreference randomMacAddressPreference;
+
+    private static final String PROP_MAC_RANDOMIZATION = "persist.mac_randomization_enabled";
+
+
     @VisibleForTesting
     NetworkDetailsTracker mNetworkDetailsTracker;
     private HandlerThread mWorkerThread;

@@ -134,6 +145,25 @@ public class WifiNetworkDetailsFragment2 extends DashboardFragment implements
         super.onCreateOptionsMenu(menu, inflater);
     }

+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        wifiManager = (WifiManager) requireContext().getSystemService(Context.WIFI_SERVICE);
+        randomMacAddressPreference = findPreference("random_mac_address_switch");
+
+        if (randomMacAddressPreference != null) {
+        randomMacAddressPreference.setChecked(isMacRandomizationSupported());
+            randomMacAddressPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                @Override
+                public boolean onPreferenceChange(Preference preference, Object newValue) {
+                    boolean isWifiMacRandomEnabled = (boolean) newValue;
+                    setRandomMacAddress(isWifiMacRandomEnabled);
+                    return true;
+                }
+            });
+        }
+    }
+
     @Override
     public boolean onOptionsItemSelected(MenuItem menuItem) {
         switch (menuItem.getItemId()) {
@@ -218,6 +248,15 @@ public class WifiNetworkDetailsFragment2 extends DashboardFragment implements
         return mControllers;
     }

+    private void setRandomMacAddress(boolean isWifiMacRandomEnabled) {
+        SystemProperties.set(PROP_MAC_RANDOMIZATION, Boolean.toString(isWifiMacRandomEnabled));
+    }
+
+    private boolean isMacRandomizationSupported() {
+        return SystemProperties.getBoolean(PROP_MAC_RANDOMIZATION, false);
+    }
+

在代码中搜索的时候我发现有WifiNetworkDetailsFragment2.java和WifiNetworkDetailsFragment.java两个差不多的文件，根据验证我的是WifiNetworkDetailsFragment2.java。