Merge "Clear dns cache when restoring network access" into main am: 8cdacba76f

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2999816

Change-Id: I11a8a2763d60c3bc01acc3ca0a56a4b79552b61b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index 6ddb36a72aa9..0e66010ae2c3 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -4022,6 +4022,13 @@ public final class ActivityThread extends ClientTransactionHandler
                     ActivityManager.getService().waitForNetworkStateUpdate(mNetworkBlockSeq);
                     mNetworkBlockSeq = INVALID_PROC_STATE_SEQ;
                 } catch (RemoteException ignored) {}
+                if (android.app.Flags.clearDnsCacheOnNetworkRulesUpdate()) {
+                    // InetAddress will cache UnknownHostException failures. If the rules got
+                    // updated and the app has network access now, we need to clear the negative
+                    // cache to ensure valid dns queries can work immediately.
+                    // TODO: b/329133769 - Clear only the negative cache once it is available.
+                    InetAddress.clearDnsCache();
+                }
             }
         }
     }
diff --git a/core/java/android/app/network-policy.aconfig b/core/java/android/app/network-policy.aconfig
new file mode 100644
index 000000000000..88f386f6025d
--- /dev/null
+++ b/core/java/android/app/network-policy.aconfig
@@ -0,0 +1,11 @@
+package: "android.app"
+
+flag {
+     namespace: "backstage_power"
+     name: "clear_dns_cache_on_network_rules_update"
+     description: "Clears the DNS cache when the network rules update"
+     bug: "237556596"
+     metadata {
+       purpose: PURPOSE_BUGFIX
+     }
+}
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