1/*
2 * Copyright (C) 2009, 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
17package com.android.server.vpn;
18
19import android.app.Service;
20import android.content.Intent;
21import android.net.vpn.IVpnService;
22import android.net.vpn.L2tpIpsecProfile;
23import android.net.vpn.L2tpIpsecPskProfile;
24import android.net.vpn.L2tpProfile;
25import android.net.vpn.PptpProfile;
26import android.net.vpn.VpnManager;
27import android.net.vpn.VpnProfile;
28import android.net.vpn.VpnState;
29import android.os.Environment;
30import android.os.IBinder;
31import android.os.SystemProperties;
32import android.util.Log;
33
34import java.io.File;
35import java.io.FileInputStream;
36import java.io.FileNotFoundException;
37import java.io.FileOutputStream;
38import java.io.IOException;
39import java.io.ObjectInputStream;
40import java.io.ObjectOutputStream;
41
42/**
43 * The service class for managing a VPN connection. It implements the
44 * {@link IVpnService} binder interface.
45 */
46public class VpnServiceBinder extends Service {
47    private static final String TAG = VpnServiceBinder.class.getSimpleName();
48    private static final boolean DBG = true;
49
50    private static final String STATES_FILE_RELATIVE_PATH = "/misc/vpn/.states";
51
52    // The actual implementation is delegated to the VpnService class.
53    private VpnService<? extends VpnProfile> mService;
54
55    private static String getStateFilePath() {
56	return Environment.getDataDirectory().getPath() + STATES_FILE_RELATIVE_PATH;
57    }
58
59    private final IBinder mBinder = new IVpnService.Stub() {
60        public boolean connect(VpnProfile p, String username, String password) {
61            return VpnServiceBinder.this.connect(p, username, password);
62        }
63
64        public void disconnect() {
65            VpnServiceBinder.this.disconnect();
66        }
67
68        public void checkStatus(VpnProfile p) {
69            VpnServiceBinder.this.checkStatus(p);
70        }
71    };
72
73    @Override
74    public void onCreate() {
75        super.onCreate();
76        checkSavedStates();
77    }
78
79
80    @Override
81    public void onStart(Intent intent, int startId) {
82        super.onStart(intent, startId);
83    }
84
85    @Override
86    public IBinder onBind(Intent intent) {
87        return mBinder;
88    }
89
90    void saveStates() throws IOException {
91        if (DBG) Log.d("VpnServiceBinder", "     saving states");
92        ObjectOutputStream oos =
93                new ObjectOutputStream(new FileOutputStream(getStateFilePath()));
94        oos.writeObject(mService);
95        oos.close();
96    }
97
98    void removeStates() {
99        try {
100            File f = new File(getStateFilePath());
101            if (f.exists()) f.delete();
102        } catch (Throwable e) {
103            if (DBG) Log.d("VpnServiceBinder", "     remove states: " + e);
104        }
105    }
106
107    private synchronized boolean connect(final VpnProfile p,
108            final String username, final String password) {
109        if (mService != null) return false;
110        final VpnService s = mService = createService(p);
111
112        new Thread(new Runnable() {
113            public void run() {
114                s.onConnect(username, password);
115            }
116        }).start();
117        return true;
118    }
119
120    private synchronized void disconnect() {
121        if (mService == null) return;
122        final VpnService s = mService;
123
124        new Thread(new Runnable() {
125            public void run() {
126                s.onDisconnect();
127            }
128        }).start();
129    }
130
131    private synchronized void checkStatus(VpnProfile p) {
132        if ((mService == null)
133                || (!p.getName().equals(mService.mProfile.getName()))) {
134            broadcastConnectivity(p.getName(), VpnState.IDLE);
135        } else {
136            broadcastConnectivity(p.getName(), mService.getState());
137        }
138    }
139
140    private void checkSavedStates() {
141        try {
142            ObjectInputStream ois = new ObjectInputStream(new FileInputStream(
143                    getStateFilePath()));
144            mService = (VpnService<? extends VpnProfile>) ois.readObject();
145            mService.recover(this);
146            ois.close();
147        } catch (FileNotFoundException e) {
148            // do nothing
149        } catch (Throwable e) {
150            Log.i("VpnServiceBinder", "recovery error, remove states: " + e);
151            removeStates();
152        }
153    }
154
155    private VpnService<? extends VpnProfile> createService(VpnProfile p) {
156        switch (p.getType()) {
157            case L2TP:
158                L2tpService l2tp = new L2tpService();
159                l2tp.setContext(this, (L2tpProfile) p);
160                return l2tp;
161
162            case PPTP:
163                PptpService pptp = new PptpService();
164                pptp.setContext(this, (PptpProfile) p);
165                return pptp;
166
167            case L2TP_IPSEC_PSK:
168                L2tpIpsecPskService psk = new L2tpIpsecPskService();
169                psk.setContext(this, (L2tpIpsecPskProfile) p);
170                return psk;
171
172            case L2TP_IPSEC:
173                L2tpIpsecService l2tpIpsec = new L2tpIpsecService();
174                l2tpIpsec.setContext(this, (L2tpIpsecProfile) p);
175                return l2tpIpsec;
176
177            default:
178                return null;
179        }
180    }
181
182    private void broadcastConnectivity(String name, VpnState s) {
183        new VpnManager(this).broadcastConnectivity(name, s);
184    }
185}
186