Merge changes I86257bc8,I5c2221c5 into nyc-dev

* changes:
  Use Netd's binder interface to set resolver configuration.
  Add Gservices settings for resolver configuration.

core/java/android/os/INetworkManagementService.aidl

@@ -323,6 +323,11 @@ interface INetworkManagementService
      */
     void removeIdleTimer(String iface);
 
+    /**
+     * Configure name servers, search paths, and resolver parameters for the given network.
+     */
+    void setDnsConfigurationForNetwork(int netId, in String[] servers, String domains);
+
     /**
      * Bind name servers to a network in the DNS resolver.
      */

core/java/android/provider/Settings.java

@@ -6973,6 +6973,33 @@ public final class Settings {
        /** {@hide} */
        public static final String STORAGE_BENCHMARK_INTERVAL = "storage_benchmark_interval";
 
+       /**
+        * Sample validity in seconds to configure for the system DNS resolver.
+        * {@hide}
+        */
+       public static final String DNS_RESOLVER_SAMPLE_VALIDITY_SECONDS =
+               "dns_resolver_sample_validity_seconds";
+
+       /**
+        * Success threshold in percent for use with the system DNS resolver.
+        * {@hide}
+        */
+       public static final String DNS_RESOLVER_SUCCESS_THRESHOLD_PERCENT =
+                "dns_resolver_success_threshold_percent";
+
+       /**
+        * Minimum number of samples needed for statistics to be considered meaningful in the
+        * system DNS resolver.
+        * {@hide}
+        */
+       public static final String DNS_RESOLVER_MIN_SAMPLES = "dns_resolver_min_samples";
+
+       /**
+        * Maximum number taken into account for statistics purposes in the system DNS resolver.
+        * {@hide}
+        */
+       public static final String DNS_RESOLVER_MAX_SAMPLES = "dns_resolver_max_samples";
+
        /**
         * Whether to disable the automatic scheduling of system updates.
         * 1 = system updates won't be automatically scheduled (will always

services/core/java/com/android/server/ConnectivityService.java

@@ -4317,10 +4317,10 @@ public class ConnectivityService extends IConnectivityManager.Stub
         Collection<InetAddress> dnses = newLp.getDnsServers();
         if (DBG) log("Setting DNS servers for network " + netId + " to " + dnses);
         try {
-            mNetd.setDnsServersForNetwork(
+            mNetd.setDnsConfigurationForNetwork(
                     netId, NetworkUtils.makeStrings(dnses), newLp.getDomains());
         } catch (Exception e) {
-            loge("Exception in setDnsServersForNetwork: " + e);
+            loge("Exception in setDnsConfigurationForNetwork: " + e);
         }
         final NetworkAgentInfo defaultNai = getDefaultNetwork();
         if (defaultNai != null && defaultNai.network.netId == netId) {

services/core/java/com/android/server/NetworkManagementService.java

@@ -47,6 +47,7 @@ import static com.android.server.NetworkManagementService.NetdResponseCode.TtyLi
 import static com.android.server.NetworkManagementSocketTagger.PROP_QTAGUID_ENABLED;
 import android.annotation.NonNull;
 import android.app.ActivityManagerNative;
+import android.content.ContentResolver;
 import android.content.Context;
 import android.net.ConnectivityManager;
 import android.net.INetd;
@@ -76,6 +77,7 @@ import android.os.ServiceSpecificException;
 import android.os.StrictMode;
 import android.os.SystemClock;
 import android.os.SystemProperties;
+import android.provider.Settings;
 import android.telephony.DataConnectionRealTimeInfo;
 import android.telephony.PhoneStateListener;
 import android.telephony.SubscriptionManager;
@@ -175,6 +177,12 @@ public class NetworkManagementService extends INetworkManagementService.Stub
         public static final int StrictCleartext           = 617;
     }
 
+    /* Defaults for resolver parameters. */
+    public static final int DNS_RESOLVER_DEFAULT_SAMPLE_VALIDITY_SECONDS = 1800;
+    public static final int DNS_RESOLVER_DEFAULT_SUCCESS_THRESHOLD_PERCENT = 25;
+    public static final int DNS_RESOLVER_DEFAULT_MIN_SAMPLES = 8;
+    public static final int DNS_RESOLVER_DEFAULT_MAX_SAMPLES = 64;
+
     /**
      * String indicating a softap command.
      */
@@ -1926,6 +1934,51 @@ public class NetworkManagementService extends INetworkManagementService.Stub
         return stats;
     }
 
+    @Override
+    public void setDnsConfigurationForNetwork(int netId, String[] servers, String domains) {
+        mContext.enforceCallingOrSelfPermission(CONNECTIVITY_INTERNAL, TAG);
+
+        ContentResolver resolver = mContext.getContentResolver();
+
+        int sampleValidity = Settings.Global.getInt(resolver,
+                Settings.Global.DNS_RESOLVER_SAMPLE_VALIDITY_SECONDS,
+                DNS_RESOLVER_DEFAULT_SAMPLE_VALIDITY_SECONDS);
+        if (sampleValidity < 0 || sampleValidity > 65535) {
+            Slog.w(TAG, "Invalid sampleValidity=" + sampleValidity + ", using default=" +
+                    DNS_RESOLVER_DEFAULT_SAMPLE_VALIDITY_SECONDS);
+            sampleValidity = DNS_RESOLVER_DEFAULT_SAMPLE_VALIDITY_SECONDS;
+        }
+
+        int successThreshold = Settings.Global.getInt(resolver,
+                Settings.Global.DNS_RESOLVER_SUCCESS_THRESHOLD_PERCENT,
+                DNS_RESOLVER_DEFAULT_SUCCESS_THRESHOLD_PERCENT);
+        if (successThreshold < 0 || successThreshold > 100) {
+            Slog.w(TAG, "Invalid successThreshold=" + successThreshold + ", using default=" +
+                    DNS_RESOLVER_DEFAULT_SUCCESS_THRESHOLD_PERCENT);
+            successThreshold = DNS_RESOLVER_DEFAULT_SUCCESS_THRESHOLD_PERCENT;
+        }
+
+        int minSamples = Settings.Global.getInt(resolver,
+                Settings.Global.DNS_RESOLVER_MIN_SAMPLES, DNS_RESOLVER_DEFAULT_MIN_SAMPLES);
+        int maxSamples = Settings.Global.getInt(resolver,
+                Settings.Global.DNS_RESOLVER_MAX_SAMPLES, DNS_RESOLVER_DEFAULT_MAX_SAMPLES);
+        if (minSamples < 0 || minSamples > maxSamples || maxSamples > 64) {
+            Slog.w(TAG, "Invalid sample count (min, max)=(" + minSamples + ", " + maxSamples +
+                    "), using default=(" + DNS_RESOLVER_DEFAULT_MIN_SAMPLES + ", " +
+                    DNS_RESOLVER_DEFAULT_MAX_SAMPLES + ")");
+            minSamples = DNS_RESOLVER_DEFAULT_MIN_SAMPLES;
+            maxSamples = DNS_RESOLVER_DEFAULT_MAX_SAMPLES;
+        }
+
+        final String[] domainStrs = domains == null ? new String[0] : domains.split(" ");
+        final int[] params = { sampleValidity, successThreshold, minSamples, maxSamples };
+        try {
+            mNetdService.setResolverConfiguration(netId, servers, domainStrs, params);
+        } catch (RemoteException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
     @Override
     public void setDnsServersForNetwork(int netId, String[] servers, String domains) {
         mContext.enforceCallingOrSelfPermission(CONNECTIVITY_INTERNAL, TAG);