/*
* 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.ContentResolver;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.ContentObserver;
import android.net.Uri;
import android.net.nsd.NsdServiceInfo;
import android.net.nsd.DnsSdTxtRecord;
import android.net.nsd.INsdManager;
import android.net.nsd.NsdManager;
import android.os.Binder;
import android.os.HandlerThread;
import android.os.Handler;
import android.os.Message;
import android.os.Messenger;
import android.os.UserHandle;
import android.provider.Settings;
import android.util.Base64;
import android.util.Slog;
import android.util.SparseArray;
import android.util.SparseIntArray;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.util.Arrays;
import java.util.HashMap;
import java.util.concurrent.CountDownLatch;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.util.AsyncChannel;
import com.android.internal.util.DumpUtils;
import com.android.internal.util.Protocol;
import com.android.internal.util.State;
import com.android.internal.util.StateMachine;
/**
* 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 final Context mContext;
private final NsdSettings mNsdSettings;
private final NsdStateMachine mNsdStateMachine;
private final DaemonConnection mDaemon;
private final NativeCallbackReceiver mDaemonCallback;
/**
* Clients receiving asynchronous messages
*/
private final HashMap<Messenger, ClientInfo> mClients = new HashMap<>();
/* A map from unique id to client info */
private final SparseArray<ClientInfo> mIdToClientInfoMap= new SparseArray<>();
private final AsyncChannel mReplyChannel = new AsyncChannel();
private static final int INVALID_ID = 0;
private int mUniqueId = 1;
private class NsdStateMachine extends StateMachine {
private final DefaultState mDefaultState = new DefaultState();
private final DisabledState mDisabledState = new DisabledState();
private final EnabledState mEnabledState = new EnabledState();
@Override
protected String getWhatToString(int what) {
return NsdManager.nameOf(what);
}
/**
* Observes the NSD on/off setting, and takes action when changed.
*/
private void registerForNsdSetting() {
final ContentObserver contentObserver = new ContentObserver(this.getHandler()) {
@Override
public void onChange(boolean selfChange) {
notifyEnabled(isNsdEnabled());
}
};
final Uri uri = Settings.Global.getUriFor(Settings.Global.NSD_ON);
mNsdSettings.registerContentObserver(uri, contentObserver);
}
NsdStateMachine(String name, Handler handler) {
super(name, handler);
addState(mDefaultState);
addState(mDisabledState, mDefaultState);
addState(mEnabledState, mDefaultState);
State initialState = isNsdEnabled() ? mEnabledState : mDisabledState;
setInitialState(initialState);
setLogRecSize(25);
registerForNsdSetting();
}
class DefaultState extends State {
@Override
public boolean processMessage(Message msg) {
ClientInfo cInfo = null;
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);
cInfo = new ClientInfo(c, msg.replyTo);
mClients.put(msg.replyTo, cInfo);
} else {
Slog.e(TAG, "Client connection failure, error=" + msg.arg1);
}
break;
case AsyncChannel.CMD_CHANNEL_DISCONNECTED:
switch (msg.arg1) {
case AsyncChannel.STATUS_SEND_UNSUCCESSFUL:
Slog.e(TAG, "Send failed, client connection lost");
break;
case AsyncChannel.STATUS_REMOTE_DISCONNECTION:
if (DBG) Slog.d(TAG, "Client disconnected");
break;
default:
if (DBG) Slog.d(TAG, "Client connection lost with reason: " + msg.arg1);
break;
}
cInfo = mClients.get(msg.replyTo);
if (cInfo != null) {
cInfo.expungeAllRequests();
mClients.remove(msg.replyTo);
}
//Last client
if (mClients.size() == 0) {
mDaemon.stop();
}
break;
case AsyncChannel.CMD_CHANNEL_FULL_CONNECTION:
AsyncChannel ac = new AsyncChannel();
ac.connect(mContext, getHandler(), msg.replyTo);
break;
case NsdManager.DISCOVER_SERVICES:
replyToMessage(msg, NsdManager.DISCOVER_SERVICES_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
break;
case NsdManager.STOP_DISCOVERY:
replyToMessage(msg, NsdManager.STOP_DISCOVERY_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
break;
case NsdManager.REGISTER_SERVICE:
replyToMessage(msg, NsdManager.REGISTER_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
break;
case NsdManager.UNREGISTER_SERVICE:
replyToMessage(msg, NsdManager.UNREGISTER_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
break;
case NsdManager.RESOLVE_SERVICE:
replyToMessage(msg, NsdManager.RESOLVE_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
break;
case NsdManager.NATIVE_DAEMON_EVENT:
default:
Slog.e(TAG, "Unhandled " + msg);
return NOT_HANDLED;
}
return HANDLED;
}
}
class DisabledState extends State {
@Override
public void enter() {
sendNsdStateChangeBroadcast(false);
}
@Override
public boolean processMessage(Message msg) {
switch (msg.what) {
case NsdManager.ENABLE:
transitionTo(mEnabledState);
break;
default:
return NOT_HANDLED;
}
return HANDLED;
}
}
class EnabledState extends State {
@Override
public void enter() {
sendNsdStateChangeBroadcast(true);
if (mClients.size() > 0) {
mDaemon.start();
}
}
@Override
public void exit() {
if (mClients.size() > 0) {
mDaemon.stop();
}
}
private boolean requestLimitReached(ClientInfo clientInfo) {
if (clientInfo.mClientIds.size() >= ClientInfo.MAX_LIMIT) {
if (DBG) Slog.d(TAG, "Exceeded max outstanding requests " + clientInfo);
return true;
}
return false;
}
private void storeRequestMap(int clientId, int globalId, ClientInfo clientInfo, int what) {
clientInfo.mClientIds.put(clientId, globalId);
clientInfo.mClientRequests.put(clientId, what);
mIdToClientInfoMap.put(globalId, clientInfo);
}
private void removeRequestMap(int clientId, int globalId, ClientInfo clientInfo) {
clientInfo.mClientIds.delete(clientId);
clientInfo.mClientRequests.delete(clientId);
mIdToClientInfoMap.remove(globalId);
}
@Override
public boolean processMessage(Message msg) {
ClientInfo clientInfo;
NsdServiceInfo servInfo;
int id;
switch (msg.what) {
case AsyncChannel.CMD_CHANNEL_HALF_CONNECTED:
//First client
if (msg.arg1 == AsyncChannel.STATUS_SUCCESSFUL &&
mClients.size() == 0) {
mDaemon.start();
}
return NOT_HANDLED;
case AsyncChannel.CMD_CHANNEL_DISCONNECTED:
return NOT_HANDLED;
case NsdManager.DISABLE:
//TODO: cleanup clients
transitionTo(mDisabledState);
break;
case NsdManager.DISCOVER_SERVICES:
if (DBG) Slog.d(TAG, "Discover services");
servInfo = (NsdServiceInfo) msg.obj;
clientInfo = mClients.get(msg.replyTo);
if (requestLimitReached(clientInfo)) {
replyToMessage(msg, NsdManager.DISCOVER_SERVICES_FAILED,
NsdManager.FAILURE_MAX_LIMIT);
break;
}
id = getUniqueId();
if (discoverServices(id, servInfo.getServiceType())) {
if (DBG) {
Slog.d(TAG, "Discover " + msg.arg2 + " " + id +
servInfo.getServiceType());
}
storeRequestMap(msg.arg2, id, clientInfo, msg.what);
replyToMessage(msg, NsdManager.DISCOVER_SERVICES_STARTED, servInfo);
} else {
stopServiceDiscovery(id);
replyToMessage(msg, NsdManager.DISCOVER_SERVICES_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
}
break;
case NsdManager.STOP_DISCOVERY:
if (DBG) Slog.d(TAG, "Stop service discovery");
clientInfo = mClients.get(msg.replyTo);
try {
id = clientInfo.mClientIds.get(msg.arg2);
} catch (NullPointerException e) {
replyToMessage(msg, NsdManager.STOP_DISCOVERY_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
break;
}
removeRequestMap(msg.arg2, id, clientInfo);
if (stopServiceDiscovery(id)) {
replyToMessage(msg, NsdManager.STOP_DISCOVERY_SUCCEEDED);
} else {
replyToMessage(msg, NsdManager.STOP_DISCOVERY_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
}
break;
case NsdManager.REGISTER_SERVICE:
if (DBG) Slog.d(TAG, "Register service");
clientInfo = mClients.get(msg.replyTo);
if (requestLimitReached(clientInfo)) {
replyToMessage(msg, NsdManager.REGISTER_SERVICE_FAILED,
NsdManager.FAILURE_MAX_LIMIT);
break;
}
id = getUniqueId();
if (registerService(id, (NsdServiceInfo) msg.obj)) {
if (DBG) Slog.d(TAG, "Register " + msg.arg2 + " " + id);
storeRequestMap(msg.arg2, id, clientInfo, msg.what);
// Return success after mDns reports success
} else {
unregisterService(id);
replyToMessage(msg, NsdManager.REGISTER_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
}
break;
case NsdManager.UNREGISTER_SERVICE:
if (DBG) Slog.d(TAG, "unregister service");
clientInfo = mClients.get(msg.replyTo);
try {
id = clientInfo.mClientIds.get(msg.arg2);
} catch (NullPointerException e) {
replyToMessage(msg, NsdManager.UNREGISTER_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
break;
}
removeRequestMap(msg.arg2, id, clientInfo);
if (unregisterService(id)) {
replyToMessage(msg, NsdManager.UNREGISTER_SERVICE_SUCCEEDED);
} else {
replyToMessage(msg, NsdManager.UNREGISTER_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
}
break;
case NsdManager.RESOLVE_SERVICE:
if (DBG) Slog.d(TAG, "Resolve service");
servInfo = (NsdServiceInfo) msg.obj;
clientInfo = mClients.get(msg.replyTo);
if (clientInfo.mResolvedService != null) {
replyToMessage(msg, NsdManager.RESOLVE_SERVICE_FAILED,
NsdManager.FAILURE_ALREADY_ACTIVE);
break;
}
id = getUniqueId();
if (resolveService(id, servInfo)) {
clientInfo.mResolvedService = new NsdServiceInfo();
storeRequestMap(msg.arg2, id, clientInfo, msg.what);
} else {
replyToMessage(msg, NsdManager.RESOLVE_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR);
}
break;
case NsdManager.NATIVE_DAEMON_EVENT:
NativeEvent event = (NativeEvent) msg.obj;
if (!handleNativeEvent(event.code, event.raw, event.cooked)) {
return NOT_HANDLED;
}
break;
default:
return NOT_HANDLED;
}
return HANDLED;
}
private boolean handleNativeEvent(int code, String raw, String[] cooked) {
NsdServiceInfo servInfo;
int id = Integer.parseInt(cooked[1]);
ClientInfo clientInfo = mIdToClientInfoMap.get(id);
if (clientInfo == null) {
String name = NativeResponseCode.nameOf(code);
Slog.e(TAG, String.format("id %d for %s has no client mapping", id, name));
return false;
}
/* This goes in response as msg.arg2 */
int clientId = clientInfo.getClientId(id);
if (clientId < 0) {
// This can happen because of race conditions. For example,
// SERVICE_FOUND may race with STOP_SERVICE_DISCOVERY,
// and we may get in this situation.
String name = NativeResponseCode.nameOf(code);
Slog.d(TAG, String.format(
"Notification %s for listener id %d that is no longer active",
name, id));
return false;
}
if (DBG) {
String name = NativeResponseCode.nameOf(code);
Slog.d(TAG, String.format("Native daemon message %s: %s", name, raw));
}
switch (code) {
case NativeResponseCode.SERVICE_FOUND:
/* NNN uniqueId serviceName regType domain */
servInfo = new NsdServiceInfo(cooked[2], cooked[3]);
clientInfo.mChannel.sendMessage(NsdManager.SERVICE_FOUND, 0,
clientId, servInfo);
break;
case NativeResponseCode.SERVICE_LOST:
/* NNN uniqueId serviceName regType domain */
servInfo = new NsdServiceInfo(cooked[2], cooked[3]);
clientInfo.mChannel.sendMessage(NsdManager.SERVICE_LOST, 0,
clientId, servInfo);
break;
case NativeResponseCode.SERVICE_DISCOVERY_FAILED:
/* NNN uniqueId errorCode */
clientInfo.mChannel.sendMessage(NsdManager.DISCOVER_SERVICES_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR, clientId);
break;
case NativeResponseCode.SERVICE_REGISTERED:
/* NNN regId serviceName regType */
servInfo = new NsdServiceInfo(cooked[2], null);
clientInfo.mChannel.sendMessage(NsdManager.REGISTER_SERVICE_SUCCEEDED,
id, clientId, servInfo);
break;
case NativeResponseCode.SERVICE_REGISTRATION_FAILED:
/* NNN regId errorCode */
clientInfo.mChannel.sendMessage(NsdManager.REGISTER_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR, clientId);
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 */
int index = 0;
while (index < cooked[2].length() && cooked[2].charAt(index) != '.') {
if (cooked[2].charAt(index) == '\\') {
++index;
}
++index;
}
if (index >= cooked[2].length()) {
Slog.e(TAG, "Invalid service found " + raw);
break;
}
String name = cooked[2].substring(0, index);
String rest = cooked[2].substring(index);
String type = rest.replace(".local.", "");
name = unescape(name);
clientInfo.mResolvedService.setServiceName(name);
clientInfo.mResolvedService.setServiceType(type);
clientInfo.mResolvedService.setPort(Integer.parseInt(cooked[4]));
clientInfo.mResolvedService.setTxtRecords(cooked[6]);
stopResolveService(id);
removeRequestMap(clientId, id, clientInfo);
int id2 = getUniqueId();
if (getAddrInfo(id2, cooked[3])) {
storeRequestMap(clientId, id2, clientInfo, NsdManager.RESOLVE_SERVICE);
} else {
clientInfo.mChannel.sendMessage(NsdManager.RESOLVE_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR, clientId);
clientInfo.mResolvedService = null;
}
break;
case NativeResponseCode.SERVICE_RESOLUTION_FAILED:
/* NNN resolveId errorCode */
stopResolveService(id);
removeRequestMap(clientId, id, clientInfo);
clientInfo.mResolvedService = null;
clientInfo.mChannel.sendMessage(NsdManager.RESOLVE_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR, clientId);
break;
case NativeResponseCode.SERVICE_GET_ADDR_FAILED:
/* NNN resolveId errorCode */
stopGetAddrInfo(id);
removeRequestMap(clientId, id, clientInfo);
clientInfo.mResolvedService = null;
clientInfo.mChannel.sendMessage(NsdManager.RESOLVE_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR, clientId);
break;
case NativeResponseCode.SERVICE_GET_ADDR_SUCCESS:
/* NNN resolveId hostname ttl addr */
try {
clientInfo.mResolvedService.setHost(InetAddress.getByName(cooked[4]));
clientInfo.mChannel.sendMessage(NsdManager.RESOLVE_SERVICE_SUCCEEDED,
0, clientId, clientInfo.mResolvedService);
} catch (java.net.UnknownHostException e) {
clientInfo.mChannel.sendMessage(NsdManager.RESOLVE_SERVICE_FAILED,
NsdManager.FAILURE_INTERNAL_ERROR, clientId);
}
stopGetAddrInfo(id);
removeRequestMap(clientId, id, clientInfo);
clientInfo.mResolvedService = null;
break;
default:
return false;
}
return true;
}
}
}
private String unescape(String s) {
StringBuilder sb = new StringBuilder(s.length());
for (int i = 0; i < s.length(); ++i) {
char c = s.charAt(i);
if (c == '\\') {
if (++i >= s.length()) {
Slog.e(TAG, "Unexpected end of escape sequence in: " + s);
break;
}
c = s.charAt(i);
if (c != '.' && c != '\\') {
if (i + 2 >= s.length()) {
Slog.e(TAG, "Unexpected end of escape sequence in: " + s);
break;
}
c = (char) ((c-'0') * 100 + (s.charAt(i+1)-'0') * 10 + (s.charAt(i+2)-'0'));
i += 2;
}
}
sb.append(c);
}
return sb.toString();
}
@VisibleForTesting
NsdService(Context ctx, NsdSettings settings, Handler handler, DaemonConnectionSupplier fn) {
mContext = ctx;
mNsdSettings = settings;
mNsdStateMachine = new NsdStateMachine(TAG, handler);
mNsdStateMachine.start();
mDaemonCallback = new NativeCallbackReceiver();
mDaemon = fn.get(mDaemonCallback);
}
public static NsdService create(Context context) throws InterruptedException {
NsdSettings settings = NsdSettings.makeDefault(context);
HandlerThread thread = new HandlerThread(TAG);
thread.start();
Handler handler = new Handler(thread.getLooper());
NsdService service = new NsdService(context, settings, handler, DaemonConnection::new);
service.mDaemonCallback.awaitConnection();
return service;
}
public Messenger getMessenger() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.INTERNET, "NsdService");
return new Messenger(mNsdStateMachine.getHandler());
}
public void setEnabled(boolean isEnabled) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.CONNECTIVITY_INTERNAL,
"NsdService");
mNsdSettings.putEnabledStatus(isEnabled);
notifyEnabled(isEnabled);
}
private void notifyEnabled(boolean isEnabled) {
mNsdStateMachine.sendMessage(isEnabled ? NsdManager.ENABLE : NsdManager.DISABLE);
}
private void sendNsdStateChangeBroadcast(boolean isEnabled) {
final Intent intent = new Intent(NsdManager.ACTION_NSD_STATE_CHANGED);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
int nsdState = isEnabled ? NsdManager.NSD_STATE_ENABLED : NsdManager.NSD_STATE_DISABLED;
intent.putExtra(NsdManager.EXTRA_NSD_STATE, nsdState);
mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
}
private boolean isNsdEnabled() {
boolean ret = mNsdSettings.isEnabled();
if (DBG) {
Slog.d(TAG, "Network service discovery is " + (ret ? "enabled" : "disabled"));
}
return ret;
}
private int getUniqueId() {
if (++mUniqueId == INVALID_ID) return ++mUniqueId;
return mUniqueId;
}
/* These should be in sync with system/netd/server/ResponseCode.h */
static final class NativeResponseCode {
public static final int SERVICE_DISCOVERY_FAILED = 602;
public static final int SERVICE_FOUND = 603;
public static final int SERVICE_LOST = 604;
public static final int SERVICE_REGISTRATION_FAILED = 605;
public static final int SERVICE_REGISTERED = 606;
public static final int SERVICE_RESOLUTION_FAILED = 607;
public static final int SERVICE_RESOLVED = 608;
public static final int SERVICE_UPDATED = 609;
public static final int SERVICE_UPDATE_FAILED = 610;
public static final int SERVICE_GET_ADDR_FAILED = 611;
public static final int SERVICE_GET_ADDR_SUCCESS = 612;
private static final SparseArray<String> CODE_NAMES = new SparseArray<>();
static {
CODE_NAMES.put(SERVICE_DISCOVERY_FAILED, "SERVICE_DISCOVERY_FAILED");
CODE_NAMES.put(SERVICE_FOUND, "SERVICE_FOUND");
CODE_NAMES.put(SERVICE_LOST, "SERVICE_LOST");
CODE_NAMES.put(SERVICE_REGISTRATION_FAILED, "SERVICE_REGISTRATION_FAILED");
CODE_NAMES.put(SERVICE_REGISTERED, "SERVICE_REGISTERED");
CODE_NAMES.put(SERVICE_RESOLUTION_FAILED, "SERVICE_RESOLUTION_FAILED");
CODE_NAMES.put(SERVICE_RESOLVED, "SERVICE_RESOLVED");
CODE_NAMES.put(SERVICE_UPDATED, "SERVICE_UPDATED");
CODE_NAMES.put(SERVICE_UPDATE_FAILED, "SERVICE_UPDATE_FAILED");
CODE_NAMES.put(SERVICE_GET_ADDR_FAILED, "SERVICE_GET_ADDR_FAILED");
CODE_NAMES.put(SERVICE_GET_ADDR_SUCCESS, "SERVICE_GET_ADDR_SUCCESS");
}
static String nameOf(int code) {
String name = CODE_NAMES.get(code);
if (name == null) {
return Integer.toString(code);
}
return name;
}
}
private class NativeEvent {
final int code;
final String raw;
final String[] cooked;
NativeEvent(int code, String raw, String[] cooked) {
this.code = code;
this.raw = raw;
this.cooked = cooked;
}
}
class NativeCallbackReceiver implements INativeDaemonConnectorCallbacks {
private final CountDownLatch connected = new CountDownLatch(1);
public void awaitConnection() throws InterruptedException {
connected.await();
}
@Override
public void onDaemonConnected() {
connected.countDown();
}
@Override
public boolean onCheckHoldWakeLock(int code) {
return false;
}
@Override
public boolean onEvent(int code, String raw, String[] cooked) {
// TODO: NDC translates a message to a callback, we could enhance NDC to
// directly interact with a state machine through messages
NativeEvent event = new NativeEvent(code, raw, cooked);
mNsdStateMachine.sendMessage(NsdManager.NATIVE_DAEMON_EVENT, event);
return true;
}
}
interface DaemonConnectionSupplier {
DaemonConnection get(NativeCallbackReceiver callback);
}
@VisibleForTesting
public static class DaemonConnection {
final NativeDaemonConnector mNativeConnector;
DaemonConnection(NativeCallbackReceiver callback) {
mNativeConnector = new NativeDaemonConnector(callback, "mdns", 10, MDNS_TAG, 25, null);
new Thread(mNativeConnector, MDNS_TAG).start();
}
public boolean execute(Object... args) {
if (DBG) {
Slog.d(TAG, "mdnssd " + Arrays.toString(args));
}
try {
mNativeConnector.execute("mdnssd", args);
} catch (NativeDaemonConnectorException e) {
Slog.e(TAG, "Failed to execute mdnssd " + Arrays.toString(args), e);
return false;
}
return true;
}
public void start() {
execute("start-service");
}
public void stop() {
execute("stop-service");
}
}
private boolean registerService(int regId, NsdServiceInfo service) {
if (DBG) {
Slog.d(TAG, "registerService: " + regId + " " + service);
}
String name = service.getServiceName();
String type = service.getServiceType();
int port = service.getPort();
byte[] textRecord = service.getTxtRecord();
String record = Base64.encodeToString(textRecord, Base64.DEFAULT).replace("\n", "");
return mDaemon.execute("register", regId, name, type, port, record);
}
private boolean unregisterService(int regId) {
return mDaemon.execute("stop-register", regId);
}
private boolean updateService(int regId, DnsSdTxtRecord t) {
if (t == null) {
return false;
}
return mDaemon.execute("update", regId, t.size(), t.getRawData());
}
private boolean discoverServices(int discoveryId, String serviceType) {
return mDaemon.execute("discover", discoveryId, serviceType);
}
private boolean stopServiceDiscovery(int discoveryId) {
return mDaemon.execute("stop-discover", discoveryId);
}
private boolean resolveService(int resolveId, NsdServiceInfo service) {
String name = service.getServiceName();
String type = service.getServiceType();
return mDaemon.execute("resolve", resolveId, name, type, "local.");
}
private boolean stopResolveService(int resolveId) {
return mDaemon.execute("stop-resolve", resolveId);
}
private boolean getAddrInfo(int resolveId, String hostname) {
return mDaemon.execute("getaddrinfo", resolveId, hostname);
}
private boolean stopGetAddrInfo(int resolveId) {
return mDaemon.execute("stop-getaddrinfo", resolveId);
}
@Override
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return;
for (ClientInfo client : mClients.values()) {
pw.println("Client Info");
pw.println(client);
}
mNsdStateMachine.dump(fd, pw, args);
}
/* arg2 on the source message has an id that needs to be retained in replies
* see NsdManager for details */
private Message obtainMessage(Message srcMsg) {
Message msg = Message.obtain();
msg.arg2 = srcMsg.arg2;
return msg;
}
private void replyToMessage(Message msg, int what) {
if (msg.replyTo == null) return;
Message dstMsg = obtainMessage(msg);
dstMsg.what = what;
mReplyChannel.replyToMessage(msg, dstMsg);
}
private void replyToMessage(Message msg, int what, int arg1) {
if (msg.replyTo == null) return;
Message dstMsg = obtainMessage(msg);
dstMsg.what = what;
dstMsg.arg1 = arg1;
mReplyChannel.replyToMessage(msg, dstMsg);
}
private void replyToMessage(Message msg, int what, Object obj) {
if (msg.replyTo == null) return;
Message dstMsg = obtainMessage(msg);
dstMsg.what = what;
dstMsg.obj = obj;
mReplyChannel.replyToMessage(msg, dstMsg);
}
/* Information tracked per client */
private class ClientInfo {
private static final int MAX_LIMIT = 10;
private final AsyncChannel mChannel;
private final Messenger mMessenger;
/* Remembers a resolved service until getaddrinfo completes */
private NsdServiceInfo mResolvedService;
/* A map from client id to unique id sent to mDns */
private final SparseIntArray mClientIds = new SparseIntArray();
/* A map from client id to the type of the request we had received */
private final SparseIntArray mClientRequests = new SparseIntArray();
private ClientInfo(AsyncChannel c, Messenger m) {
mChannel = c;
mMessenger = m;
if (DBG) Slog.d(TAG, "New client, channel: " + c + " messenger: " + m);
}
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("mChannel ").append(mChannel).append("\n");
sb.append("mMessenger ").append(mMessenger).append("\n");
sb.append("mResolvedService ").append(mResolvedService).append("\n");
for(int i = 0; i< mClientIds.size(); i++) {
int clientID = mClientIds.keyAt(i);
sb.append("clientId ").append(clientID).
append(" mDnsId ").append(mClientIds.valueAt(i)).
append(" type ").append(mClientRequests.get(clientID)).append("\n");
}
return sb.toString();
}
// Remove any pending requests from the global map when we get rid of a client,
// and send cancellations to the daemon.
private void expungeAllRequests() {
int globalId, clientId, i;
// TODO: to keep handler responsive, do not clean all requests for that client at once.
for (i = 0; i < mClientIds.size(); i++) {
clientId = mClientIds.keyAt(i);
globalId = mClientIds.valueAt(i);
mIdToClientInfoMap.remove(globalId);
if (DBG) Slog.d(TAG, "Terminating client-ID " + clientId +
" global-ID " + globalId + " type " + mClientRequests.get(clientId));
switch (mClientRequests.get(clientId)) {
case NsdManager.DISCOVER_SERVICES:
stopServiceDiscovery(globalId);
break;
case NsdManager.RESOLVE_SERVICE:
stopResolveService(globalId);
break;
case NsdManager.REGISTER_SERVICE:
unregisterService(globalId);
break;
default:
break;
}
}
mClientIds.clear();
mClientRequests.clear();
}
// mClientIds is a sparse array of listener id -> mDnsClient id. For a given mDnsClient id,
// return the corresponding listener id. mDnsClient id is also called a global id.
private int getClientId(final int globalId) {
int idx = mClientIds.indexOfValue(globalId);
if (idx < 0) {
return idx;
}
return mClientIds.keyAt(idx);
}
}
/**
* Interface which encapsulates dependencies of NsdService that are hard to mock, hard to
* override, or have side effects on global state in unit tests.
*/
@VisibleForTesting
public interface NsdSettings {
boolean isEnabled();
void putEnabledStatus(boolean isEnabled);
void registerContentObserver(Uri uri, ContentObserver observer);
static NsdSettings makeDefault(Context context) {
final ContentResolver resolver = context.getContentResolver();
return new NsdSettings() {
@Override
public boolean isEnabled() {
return Settings.Global.getInt(resolver, Settings.Global.NSD_ON, 1) == 1;
}
@Override
public void putEnabledStatus(boolean isEnabled) {
Settings.Global.putInt(resolver, Settings.Global.NSD_ON, isEnabled ? 1 : 0);
}
@Override
public void registerContentObserver(Uri uri, ContentObserver observer) {
resolver.registerContentObserver(uri, false, observer);
}
};
}
}
}