Move NetworkPolicy from apps to UID.

For multi-user devices, switch to storing policy per-user instead of
per-app.  Also watch for user added/removed broadcasts to clean up
policies and apply global restrictions.

Bug: 7121279
Change-Id: Ia7326bd0ebe0586fa4ec6d3a62f6313dc8814007

Author: jsharkey

core/java/android/content/Intent.java

@@ -1473,7 +1473,7 @@ public static Intent createChooser(Intent target, CharSequence title) {
      * Broadcast Action: A new application package has been installed on the
      * device. The data contains the name of the package.  Note that the
      * newly installed package does <em>not</em> receive this broadcast.
-     * <p>My include the following extras:
+     * <p>May include the following extras:
      * <ul>
      * <li> {@link #EXTRA_UID} containing the integer uid assigned to the new package.
      * <li> {@link #EXTRA_REPLACING} is set to true if this is following
@@ -1489,7 +1489,7 @@ public static Intent createChooser(Intent target, CharSequence title) {
      * Broadcast Action: A new version of an application package has been
      * installed, replacing an existing version that was previously installed.
      * The data contains the name of the package.
-     * <p>My include the following extras:
+     * <p>May include the following extras:
      * <ul>
      * <li> {@link #EXTRA_UID} containing the integer uid assigned to the new package.
      * </ul>

core/java/android/net/INetworkPolicyManager.aidl

@@ -30,9 +30,9 @@ import android.net.NetworkTemplate;
 interface INetworkPolicyManager {
 
     /** Control UID policies. */
-    void setAppPolicy(int appId, int policy);
-    int getAppPolicy(int appId);
-    int[] getAppsWithPolicy(int policy);
+    void setUidPolicy(int uid, int policy);
+    int getUidPolicy(int uid);
+    int[] getUidsWithPolicy(int policy);
 
     boolean isUidForeground(int uid);
 

core/java/android/net/NetworkPolicyManager.java

@@ -26,6 +26,7 @@
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.Signature;
 import android.os.RemoteException;
+import android.os.UserHandle;
 import android.text.format.Time;
 
 import com.google.android.collect.Sets;
@@ -72,29 +73,29 @@ public static NetworkPolicyManager from(Context context) {
     }
 
     /**
-     * Set policy flags for specific application.
+     * Set policy flags for specific UID.
      *
      * @param policy {@link #POLICY_NONE} or combination of flags like
      *            {@link #POLICY_REJECT_METERED_BACKGROUND}.
      */
-    public void setAppPolicy(int appId, int policy) {
+    public void setUidPolicy(int uid, int policy) {
         try {
-            mService.setAppPolicy(appId, policy);
+            mService.setUidPolicy(uid, policy);
         } catch (RemoteException e) {
         }
     }
 
-    public int getAppPolicy(int appId) {
+    public int getUidPolicy(int uid) {
         try {
-            return mService.getAppPolicy(appId);
+            return mService.getUidPolicy(uid);
         } catch (RemoteException e) {
             return POLICY_NONE;
         }
     }
 
-    public int[] getAppsWithPolicy(int policy) {
+    public int[] getUidsWithPolicy(int policy) {
         try {
-            return mService.getAppsWithPolicy(policy);
+            return mService.getUidsWithPolicy(policy);
         } catch (RemoteException e) {
             return new int[0];
         }
@@ -236,8 +237,7 @@ public static void snapToCycleDay(Time time, int cycleDay) {
     @Deprecated
     public static boolean isUidValidForPolicy(Context context, int uid) {
         // first, quick-reject non-applications
-        if (uid < android.os.Process.FIRST_APPLICATION_UID
-                || uid > android.os.Process.LAST_APPLICATION_UID) {
+        if (!UserHandle.isApp(uid)) {
             return false;
         }
 

core/java/android/os/UserHandle.java

@@ -87,15 +87,19 @@ public static final boolean isSameApp(int uid1, int uid2) {
 
     /** @hide */
     public static final boolean isIsolated(int uid) {
-        uid = getAppId(uid);
-        return uid >= Process.FIRST_ISOLATED_UID && uid <= Process.LAST_ISOLATED_UID;
+        if (uid > 0) {
+            final int appId = getAppId(uid);
+            return appId >= Process.FIRST_ISOLATED_UID && appId <= Process.LAST_ISOLATED_UID;
+        } else {
+            return false;
+        }
     }
 
     /** @hide */
     public static boolean isApp(int uid) {
         if (uid > 0) {
-            uid = UserHandle.getAppId(uid);
-            return uid >= Process.FIRST_APPLICATION_UID && uid <= Process.LAST_APPLICATION_UID;
+            final int appId = getAppId(uid);
+            return appId >= Process.FIRST_APPLICATION_UID && appId <= Process.LAST_APPLICATION_UID;
         } else {
             return false;
         }