[NS04.5] Have NetworkOffer embark a provider ID

...instead of a Messenger.
This will be useful later to compare whether a given offer is
offered by the same provider satisfying a request.

Bug: 167544279
Test: ConnectivityServiceTest
Merged-In: I3c2563d4ae4e3715d0c6270344ba8f7ef067872f
Merged-In: I975a9439021c7fa511c50ac982819b6dd146291e
Change-Id: I975a9439021c7fa511c50ac982819b6dd146291e
  (cherry-picked from 148dcce559)

framework/src/android/net/ConnectivityManager.java

@@ -3364,11 +3364,11 @@ public class ConnectivityManager {
     @RequiresPermission(anyOf = {
             NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK,
             android.Manifest.permission.NETWORK_FACTORY})
-    public void offerNetwork(@NonNull final NetworkProvider provider,
+    public void offerNetwork(@NonNull final int providerId,
             @NonNull final NetworkScore score, @NonNull final NetworkCapabilities caps,
             @NonNull final INetworkOfferCallback callback) {
         try {
-            mService.offerNetwork(Objects.requireNonNull(provider.getMessenger(), "null messenger"),
+            mService.offerNetwork(providerId,
                     Objects.requireNonNull(score, "null score"),
                     Objects.requireNonNull(caps, "null caps"),
                     Objects.requireNonNull(callback, "null callback"));

framework/src/android/net/IConnectivityManager.aidl

@@ -223,7 +223,7 @@ interface IConnectivityManager
 
     int getRestrictBackgroundStatusByCaller();
 
-    void offerNetwork(in Messenger messenger, in NetworkScore score,
+    void offerNetwork(int providerId, in NetworkScore score,
             in NetworkCapabilities caps, in INetworkOfferCallback callback);
     void unofferNetwork(in INetworkOfferCallback callback);
 }

framework/src/android/net/NetworkProvider.java

@@ -272,6 +272,9 @@ public class NetworkProvider {
     public void offerNetwork(@NonNull final NetworkScore score,
             @NonNull final NetworkCapabilities caps, @NonNull final Executor executor,
             @NonNull final NetworkOfferCallback callback) {
+        // Can't offer a network with a provider that is not yet registered or already unregistered.
+        final int providerId = mProviderId;
+        if (providerId == ID_NONE) return;
         NetworkOfferCallbackProxy proxy = null;
         synchronized (mProxies) {
             for (final NetworkOfferCallbackProxy existingProxy : mProxies) {
@@ -285,7 +288,8 @@ public class NetworkProvider {
                 mProxies.add(proxy);
             }
         }
-        mContext.getSystemService(ConnectivityManager.class).offerNetwork(this, score, caps, proxy);
+        mContext.getSystemService(ConnectivityManager.class)
+                .offerNetwork(providerId, score, caps, proxy);
     }
 
     /**

service/src/com/android/server/ConnectivityService.java

@@ -6237,11 +6237,11 @@ public class ConnectivityService extends IConnectivityManager.Stub
     }
 
     @Override
-    public void offerNetwork(@NonNull final Messenger providerMessenger,
+    public void offerNetwork(final int providerId,
             @NonNull final NetworkScore score, @NonNull final NetworkCapabilities caps,
             @NonNull final INetworkOfferCallback callback) {
         final NetworkOffer offer = new NetworkOffer(
-                FullScore.makeProspectiveScore(score, caps), caps, callback, providerMessenger);
+                FullScore.makeProspectiveScore(score, caps), caps, callback, providerId);
         mHandler.sendMessage(mHandler.obtainMessage(EVENT_REGISTER_NETWORK_OFFER, offer));
     }
 
@@ -6259,7 +6259,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
         // Unregister all the offers from this provider
         final ArrayList<NetworkOfferInfo> toRemove = new ArrayList<>();
         for (final NetworkOfferInfo noi : mNetworkOffers) {
-            if (noi.offer.provider == messenger) {
+            if (noi.offer.providerId == npi.providerId) {
                 // Can't call handleUnregisterNetworkOffer here because iteration is in progress
                 toRemove.add(noi);
             }
@@ -6651,13 +6651,6 @@ public class ConnectivityService extends IConnectivityManager.Stub
      */
     private void handleRegisterNetworkOffer(@NonNull final NetworkOffer newOffer) {
         ensureRunningOnConnectivityServiceThread();
-        if (null == mNetworkProviderInfos.get(newOffer.provider)) {
-            // This may actually happen if a provider updates its score or registers and then
-            // immediately unregisters. The offer would still be in the handler queue, but the
-            // provider would have been removed.
-            if (DBG) log("Received offer from an unregistered provider");
-            return;
-        }
 
         final NetworkOfferInfo existingOffer = findNetworkOfferInfoByCallback(newOffer.callback);
         if (null != existingOffer) {
@@ -6666,7 +6659,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
         }
         final NetworkOfferInfo noi = new NetworkOfferInfo(newOffer);
         try {
-            noi.offer.provider.getBinder().linkToDeath(noi, 0 /* flags */);
+            noi.offer.callback.asBinder().linkToDeath(noi, 0 /* flags */);
         } catch (RemoteException e) {
             noi.binderDied();
             return;
@@ -6678,7 +6671,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
     private void handleUnregisterNetworkOffer(@NonNull final NetworkOfferInfo noi) {
         ensureRunningOnConnectivityServiceThread();
         mNetworkOffers.remove(noi);
-        noi.offer.provider.getBinder().unlinkToDeath(noi, 0 /* flags */);
+        noi.offer.callback.asBinder().unlinkToDeath(noi, 0 /* flags */);
     }
 
     @Nullable private NetworkOfferInfo findNetworkOfferInfoByCallback(

service/src/com/android/server/connectivity/NetworkOffer.java

@@ -21,7 +21,6 @@ import android.annotation.Nullable;
 import android.net.INetworkOfferCallback;
 import android.net.NetworkCapabilities;
 import android.net.NetworkRequest;
-import android.os.Messenger;
 
 import java.util.Objects;
 
@@ -44,7 +43,7 @@ public class NetworkOffer {
     @NonNull public final FullScore score;
     @NonNull public final NetworkCapabilities caps;
     @NonNull public final INetworkOfferCallback callback;
-    @NonNull public final Messenger provider;
+    @NonNull public final int providerId;
 
     private static NetworkCapabilities emptyCaps() {
         final NetworkCapabilities nc = new NetworkCapabilities();
@@ -56,11 +55,11 @@ public class NetworkOffer {
     public NetworkOffer(@NonNull final FullScore score,
             @Nullable final NetworkCapabilities caps,
             @NonNull final INetworkOfferCallback callback,
-            @NonNull final Messenger provider) {
+            @NonNull final int providerId) {
         this.score = Objects.requireNonNull(score);
         this.caps = null != caps ? caps : emptyCaps();
         this.callback = Objects.requireNonNull(callback);
-        this.provider = Objects.requireNonNull(provider);
+        this.providerId = providerId;
     }
 
     /**