1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.bips.p2p; 18 19 import android.content.BroadcastReceiver; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.net.NetworkInfo; 23 import android.net.wifi.WpsInfo; 24 import android.net.wifi.p2p.WifiP2pConfig; 25 import android.net.wifi.p2p.WifiP2pDevice; 26 import android.net.wifi.p2p.WifiP2pDeviceList; 27 import android.net.wifi.p2p.WifiP2pGroup; 28 import android.net.wifi.p2p.WifiP2pInfo; 29 import android.net.wifi.p2p.WifiP2pManager; 30 import android.os.Looper; 31 import android.util.Log; 32 33 import com.android.bips.BuiltInPrintService; 34 import com.android.bips.DelayedAction; 35 import com.android.bips.util.BroadcastMonitor; 36 37 import java.util.List; 38 import java.util.concurrent.CopyOnWriteArrayList; 39 40 /** 41 * Manage the process of connecting to a previously discovered P2P device 42 */ 43 public class P2pConnectionProcedure extends BroadcastReceiver { 44 private static final String TAG = P2pConnectionProcedure.class.getSimpleName(); 45 private static final boolean DEBUG = false; 46 47 private static final int P2P_CONNECT_DELAYED_PERIOD = 3000; 48 49 private final BuiltInPrintService mService; 50 private final WifiP2pManager mP2pManager; 51 private final WifiP2pDevice mPeer; 52 private final BroadcastMonitor mConnectionMonitor; 53 private final List<P2pConnectionListener> mListeners = new CopyOnWriteArrayList<>(); 54 private WifiP2pManager.Channel mChannel; 55 private String mNetwork; 56 private WifiP2pInfo mInfo; 57 private boolean mInvited = false; 58 private boolean mDelayed = false; 59 private DelayedAction mDetectDelayed; 60 61 P2pConnectionProcedure(BuiltInPrintService service, WifiP2pManager p2pManager, 62 WifiP2pDevice peer, P2pConnectionListener listener) { 63 mService = service; 64 mP2pManager = p2pManager; 65 mPeer = peer; 66 mConnectionMonitor = service.receiveBroadcasts(this, 67 WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION, 68 WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION); 69 if (DEBUG) Log.d(TAG, "Connecting to " + mPeer.deviceAddress); 70 mChannel = mP2pManager.initialize(service, Looper.getMainLooper(), null); 71 mListeners.add(listener); 72 mP2pManager.connect(mChannel, configForPeer(peer), null); 73 } 74 75 private WifiP2pConfig configForPeer(WifiP2pDevice peer) { 76 WifiP2pConfig config = new WifiP2pConfig(); 77 config.deviceAddress = peer.deviceAddress; 78 if (peer.wpsPbcSupported()) { 79 config.wps.setup = WpsInfo.PBC; 80 } else if (peer.wpsKeypadSupported()) { 81 config.wps.setup = WpsInfo.KEYPAD; 82 } else { 83 config.wps.setup = WpsInfo.DISPLAY; 84 } 85 return config; 86 } 87 88 /** Return the peer associated with this connection procedure */ 89 public WifiP2pDevice getPeer() { 90 return mPeer; 91 } 92 93 /** Return true if the specified listener is currently listening to this object */ 94 boolean hasListener(P2pConnectionListener listener) { 95 return mListeners.contains(listener); 96 } 97 98 void addListener(P2pConnectionListener listener) { 99 if (mInfo != null) { 100 listener.onConnectionOpen(mNetwork, mInfo); 101 } 102 mListeners.add(listener); 103 } 104 105 void removeListener(P2pConnectionListener listener) { 106 mListeners.remove(listener); 107 } 108 109 int getListenerCount() { 110 return mListeners.size(); 111 } 112 113 /** Close this connection */ 114 public void close() { 115 if (DEBUG) Log.d(TAG, "stop() for " + mPeer.deviceAddress); 116 mListeners.clear(); 117 mConnectionMonitor.close(); 118 if (mDetectDelayed != null) { 119 mDetectDelayed.cancel(); 120 } 121 if (mChannel != null) { 122 mP2pManager.cancelConnect(mChannel, null); 123 mP2pManager.removeGroup(mChannel, null); 124 mChannel.close(); 125 mChannel = null; 126 } 127 } 128 129 @Override 130 public void onReceive(Context context, Intent intent) { 131 if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(intent.getAction())) { 132 NetworkInfo network = intent.getParcelableExtra(WifiP2pManager.EXTRA_NETWORK_INFO); 133 WifiP2pGroup group = intent.getParcelableExtra(WifiP2pManager.EXTRA_WIFI_P2P_GROUP); 134 WifiP2pInfo info = intent.getParcelableExtra(WifiP2pManager.EXTRA_WIFI_P2P_INFO); 135 136 if (DEBUG) Log.d(TAG, "Connection state=" + network.getState()); 137 138 if (network.isConnected()) { 139 if (isConnectedToPeer(group)) { 140 if (DEBUG) Log.d(TAG, "Group=" + group.getNetworkName() + ", info=" + info); 141 if (mDelayed) { 142 // We notified a delay in the past, remove this 143 for (P2pConnectionListener listener : mListeners) { 144 listener.onConnectionDelayed(false); 145 } 146 } else { 147 // Cancel any future delayed indications 148 if (mDetectDelayed != null) { 149 mDetectDelayed.cancel(); 150 } 151 } 152 153 mNetwork = group.getInterface(); 154 mInfo = info; 155 for (P2pConnectionListener listener : mListeners) { 156 listener.onConnectionOpen(mNetwork, mInfo); 157 } 158 } 159 } else if (mInvited) { 160 // Only signal connection closure if we reached the invitation phase 161 for (P2pConnectionListener listener : mListeners) { 162 listener.onConnectionClosed(); 163 } 164 close(); 165 } 166 } else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(intent.getAction())) { 167 WifiP2pDeviceList list = intent.getParcelableExtra( 168 WifiP2pManager.EXTRA_P2P_DEVICE_LIST); 169 WifiP2pDevice device = list.get(mPeer.deviceAddress); 170 if (DEBUG) Log.d(TAG, "Peers changed, device is " + P2pMonitor.toString(device)); 171 172 if (!mInvited && device != null && device.status == WifiP2pDevice.INVITED) { 173 // Upon first invite, start timer to detect delayed connection 174 mInvited = true; 175 mDetectDelayed = mService.delay(P2P_CONNECT_DELAYED_PERIOD, () -> { 176 mDelayed = true; 177 for (P2pConnectionListener listener : mListeners) { 178 listener.onConnectionDelayed(true); 179 } 180 }); 181 } 182 } 183 } 184 185 /** Return true if group is connected to the peer */ 186 private boolean isConnectedToPeer(WifiP2pGroup group) { 187 WifiP2pDevice owner = group.getOwner(); 188 if (owner != null && owner.deviceAddress.equals(mPeer.deviceAddress)) { 189 return true; 190 } 191 for (WifiP2pDevice client : group.getClientList()) { 192 if (client.deviceAddress.equals(mPeer.deviceAddress)) { 193 return true; 194 } 195 } 196 return false; 197 } 198 } 199
