Add initial framework for DNS service discovery
Change-Id: I53c0b7ebfd75e520ebb7553612f1aa8413b6b79b
diff --git a/services/java/com/android/server/NsdService.java b/services/java/com/android/server/NsdService.java
new file mode 100644
index 0000000..768be7d
--- /dev/null
+++ b/services/java/com/android/server/NsdService.java
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.net.nsd.DnsSdServiceInfo;
+import android.net.nsd.DnsSdTxtRecord;
+import android.net.nsd.INsdManager;
+import android.net.nsd.NsdManager;
+import android.os.Binder;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Message;
+import android.os.Messenger;
+import android.os.IBinder;
+import android.util.Slog;
+
+import java.io.FileDescriptor;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.concurrent.CountDownLatch;
+import java.util.List;
+
+import com.android.internal.app.IBatteryStats;
+import com.android.internal.telephony.TelephonyIntents;
+import com.android.internal.util.AsyncChannel;
+import com.android.server.am.BatteryStatsService;
+import com.android.server.NativeDaemonConnector.Command;
+import com.android.internal.R;
+
+/**
+ * Network Service Discovery Service handles remote service discovery operation requests by
+ * implementing the INsdManager interface.
+ *
+ * @hide
+ */
+public class NsdService extends INsdManager.Stub {
+ private static final String TAG = "NsdService";
+ private static final String MDNS_TAG = "mDnsConnector";
+
+ private static final boolean DBG = true;
+
+ private Context mContext;
+
+ /**
+ * Clients receiving asynchronous messages
+ */
+ private List<AsyncChannel> mClients = new ArrayList<AsyncChannel>();
+
+ private AsyncChannel mReplyChannel = new AsyncChannel();
+
+ /**
+ * Handles client(app) connections
+ */
+ private class AsyncServiceHandler extends Handler {
+
+ AsyncServiceHandler(android.os.Looper looper) {
+ super(looper);
+ }
+
+ @Override
+ public void handleMessage(Message msg) {
+ switch (msg.what) {
+ case AsyncChannel.CMD_CHANNEL_HALF_CONNECTED:
+ if (msg.arg1 == AsyncChannel.STATUS_SUCCESSFUL) {
+ AsyncChannel c = (AsyncChannel) msg.obj;
+ if (DBG) Slog.d(TAG, "New client listening to asynchronous messages");
+ c.sendMessage(AsyncChannel.CMD_CHANNEL_FULLY_CONNECTED);
+ mClients.add(c);
+ } else {
+ Slog.e(TAG, "Client connection failure, error=" + msg.arg1);
+ }
+ break;
+ case AsyncChannel.CMD_CHANNEL_DISCONNECTED:
+ if (msg.arg1 == AsyncChannel.STATUS_SEND_UNSUCCESSFUL) {
+ Slog.e(TAG, "Send failed, client connection lost");
+ } else {
+ if (DBG) Slog.d(TAG, "Client connection lost with reason: " + msg.arg1);
+ }
+ mClients.remove((AsyncChannel) msg.obj);
+ break;
+ case AsyncChannel.CMD_CHANNEL_FULL_CONNECTION:
+ AsyncChannel ac = new AsyncChannel();
+ ac.connect(mContext, this, msg.replyTo);
+ break;
+ case NsdManager.DISCOVER_SERVICES:
+ if (DBG) Slog.d(TAG, "Discover services");
+ DnsSdServiceInfo s = (DnsSdServiceInfo) msg.obj;
+ discoverServices(1, s.getServiceType());
+ mReplyChannel.replyToMessage(msg, NsdManager.DISCOVER_SERVICES_STARTED);
+ break;
+ case NsdManager.STOP_DISCOVERY:
+ if (DBG) Slog.d(TAG, "Stop service discovery");
+ mReplyChannel.replyToMessage(msg, NsdManager.STOP_DISCOVERY_FAILED);
+ break;
+ case NsdManager.REGISTER_SERVICE:
+ if (DBG) Slog.d(TAG, "Register service");
+ mReplyChannel.replyToMessage(msg, NsdManager.REGISTER_SERVICE_FAILED);
+ break;
+ case NsdManager.UPDATE_SERVICE:
+ if (DBG) Slog.d(TAG, "Update service");
+ mReplyChannel.replyToMessage(msg, NsdManager.UPDATE_SERVICE_FAILED);
+ break;
+ default:
+ Slog.d(TAG, "NsdServicehandler.handleMessage ignoring msg=" + msg);
+ break;
+ }
+ }
+ }
+ private AsyncServiceHandler mAsyncServiceHandler;
+
+ private NativeDaemonConnector mNativeConnector;
+ private final CountDownLatch mNativeDaemonConnected = new CountDownLatch(1);
+
+ private NsdService(Context context) {
+ mContext = context;
+
+ HandlerThread nsdThread = new HandlerThread("NsdService");
+ nsdThread.start();
+ mAsyncServiceHandler = new AsyncServiceHandler(nsdThread.getLooper());
+
+ /*
+ mNativeConnector = new NativeDaemonConnector(new NativeCallbackReceiver(), "mdns", 10,
+ MDNS_TAG, 25);
+ Thread th = new Thread(mNativeConnector, MDNS_TAG);
+ th.start();
+ */
+ }
+
+ public static NsdService create(Context context) throws InterruptedException {
+ NsdService service = new NsdService(context);
+ /* service.mNativeDaemonConnected.await(); */
+ return service;
+ }
+
+ public Messenger getMessenger() {
+ return new Messenger(mAsyncServiceHandler);
+ }
+
+ /* These should be in sync with system/netd/mDnsResponseCode.h */
+ class NativeResponseCode {
+ public static final int SERVICE_FOUND = 101;
+ public static final int SERVICE_LOST = 102;
+ public static final int SERVICE_DISCOVERY_FAILED = 103;
+
+ public static final int SERVICE_REGISTERED = 104;
+ public static final int SERVICE_REGISTRATION_FAILED = 105;
+
+ public static final int SERVICE_UPDATED = 106;
+ public static final int SERVICE_UPDATE_FAILED = 107;
+
+ public static final int SERVICE_RESOLVED = 108;
+ public static final int SERVICE_RESOLUTION_FAILED = 109;
+ }
+
+
+ class NativeCallbackReceiver implements INativeDaemonConnectorCallbacks {
+ public void onDaemonConnected() {
+ mNativeDaemonConnected.countDown();
+ }
+
+ public boolean onEvent(int code, String raw, String[] cooked) {
+ switch (code) {
+ case NativeResponseCode.SERVICE_FOUND:
+ /* NNN uniqueId serviceName regType */
+ break;
+ case NativeResponseCode.SERVICE_LOST:
+ /* NNN uniqueId serviceName regType */
+ break;
+ case NativeResponseCode.SERVICE_DISCOVERY_FAILED:
+ /* NNN uniqueId errorCode */
+ break;
+ case NativeResponseCode.SERVICE_REGISTERED:
+ /* NNN regId serviceName regType */
+ break;
+ case NativeResponseCode.SERVICE_REGISTRATION_FAILED:
+ /* NNN regId errorCode */
+ break;
+ case NativeResponseCode.SERVICE_UPDATED:
+ /* NNN regId */
+ break;
+ case NativeResponseCode.SERVICE_UPDATE_FAILED:
+ /* NNN regId errorCode */
+ break;
+ case NativeResponseCode.SERVICE_RESOLVED:
+ /* NNN resolveId fullName hostName port txtlen txtdata */
+ break;
+ case NativeResponseCode.SERVICE_RESOLUTION_FAILED:
+ /* NNN resovleId errorCode */
+ break;
+ default:
+ break;
+ }
+ return false;
+ }
+ }
+
+ private void registerService(int regId, DnsSdServiceInfo service) {
+ try {
+ //Add txtlen and txtdata
+ mNativeConnector.execute("mdnssd", "register", regId, service.getServiceName(),
+ service.getServiceType(), service.getPort());
+ } catch(NativeDaemonConnectorException e) {
+ Slog.e(TAG, "Failed to execute registerService");
+ }
+ }
+
+ private void updateService(int regId, DnsSdTxtRecord t) {
+ try {
+ if (t == null) return;
+ mNativeConnector.execute("mdnssd", "update", regId, t.size(), t.getRawData());
+ } catch(NativeDaemonConnectorException e) {
+ Slog.e(TAG, "Failed to updateServices");
+ }
+ }
+
+ private void discoverServices(int discoveryId, String serviceType) {
+ try {
+ mNativeConnector.execute("mdnssd", "discover", discoveryId, serviceType);
+ } catch(NativeDaemonConnectorException e) {
+ Slog.e(TAG, "Failed to discoverServices");
+ }
+ }
+
+ private void stopServiceDiscovery(int discoveryId) {
+ try {
+ mNativeConnector.execute("mdnssd", "stopdiscover", discoveryId);
+ } catch(NativeDaemonConnectorException e) {
+ Slog.e(TAG, "Failed to stopServiceDiscovery");
+ }
+ }
+
+ private void resolveService(DnsSdServiceInfo service) {
+ try {
+ mNativeConnector.execute("mdnssd", "resolve", service.getServiceName(),
+ service.getServiceType());
+ } catch(NativeDaemonConnectorException e) {
+ Slog.e(TAG, "Failed to resolveService");
+ }
+ }
+
+ @Override
+ protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+ if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
+ != PackageManager.PERMISSION_GRANTED) {
+ pw.println("Permission Denial: can't dump ServiceDiscoverService from from pid="
+ + Binder.getCallingPid()
+ + ", uid=" + Binder.getCallingUid());
+ return;
+ }
+
+ pw.println("Internal state:");
+ }
+}