1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*
* Copyright (C) 2014 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.ethernet;
import static com.android.net.module.util.DeviceConfigUtils.TETHERING_MODULE_NAME;
import android.annotation.Nullable;
import android.content.ApexEnvironment;
import android.net.IpConfiguration;
import android.os.Environment;
import android.util.ArrayMap;
import android.util.AtomicFile;
import android.util.Log;
import com.android.internal.annotations.VisibleForTesting;
import com.android.server.net.IpConfigStore;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* This class provides an API to store and manage Ethernet network configuration.
*/
public class EthernetConfigStore {
private static final String TAG = EthernetConfigStore.class.getSimpleName();
private static final String CONFIG_FILE = "ipconfig.txt";
private static final String FILE_PATH = "/misc/ethernet/";
private static final String LEGACY_IP_CONFIG_FILE_PATH = Environment.getDataDirectory()
+ FILE_PATH;
private static final String APEX_IP_CONFIG_FILE_PATH = ApexEnvironment.getApexEnvironment(
TETHERING_MODULE_NAME).getDeviceProtectedDataDir() + FILE_PATH;
private IpConfigStore mStore = new IpConfigStore();
private final ArrayMap<String, IpConfiguration> mIpConfigurations;
private IpConfiguration mIpConfigurationForDefaultInterface;
private final Object mSync = new Object();
public EthernetConfigStore() {
mIpConfigurations = new ArrayMap<>(0);
}
private static boolean doesConfigFileExist(final String filepath) {
return new File(filepath).exists();
}
private void writeLegacyIpConfigToApexPath(final String newFilePath, final String oldFilePath,
final String filename) {
final File directory = new File(newFilePath);
if (!directory.exists()) {
directory.mkdirs();
}
// Write the legacy IP config to the apex file path.
FileOutputStream fos = null;
final AtomicFile dst = new AtomicFile(new File(newFilePath + filename));
final AtomicFile src = new AtomicFile(new File(oldFilePath + filename));
try {
final byte[] raw = src.readFully();
if (raw.length > 0) {
fos = dst.startWrite();
fos.write(raw);
fos.flush();
dst.finishWrite(fos);
}
} catch (IOException e) {
Log.e(TAG, "Fail to sync the legacy IP config to the apex file path.");
dst.failWrite(fos);
}
}
public void read() {
read(APEX_IP_CONFIG_FILE_PATH, LEGACY_IP_CONFIG_FILE_PATH, CONFIG_FILE);
}
@VisibleForTesting
void read(final String newFilePath, final String oldFilePath, final String filename) {
synchronized (mSync) {
// Attempt to read the IP configuration from apex file path first.
if (doesConfigFileExist(newFilePath + filename)) {
loadConfigFileLocked(newFilePath + filename);
return;
}
// If the config file doesn't exist in the apex file path, attempt to read it from
// the legacy file path, if config file exists, write the legacy IP configuration to
// apex config file path, this should just happen on the first boot. New or updated
// config entries are only written to the apex config file later.
if (!doesConfigFileExist(oldFilePath + filename)) return;
loadConfigFileLocked(oldFilePath + filename);
writeLegacyIpConfigToApexPath(newFilePath, oldFilePath, filename);
}
}
private void loadConfigFileLocked(final String filepath) {
final ArrayMap<String, IpConfiguration> configs =
IpConfigStore.readIpConfigurations(filepath);
mIpConfigurations.putAll(configs);
}
public void write(String iface, IpConfiguration config) {
write(iface, config, APEX_IP_CONFIG_FILE_PATH + CONFIG_FILE);
}
@VisibleForTesting
void write(String iface, IpConfiguration config, String filepath) {
boolean modified;
synchronized (mSync) {
if (config == null) {
modified = mIpConfigurations.remove(iface) != null;
} else {
IpConfiguration oldConfig = mIpConfigurations.put(iface, config);
modified = !config.equals(oldConfig);
}
if (modified) {
mStore.writeIpConfigurations(filepath, mIpConfigurations);
}
}
}
public ArrayMap<String, IpConfiguration> getIpConfigurations() {
synchronized (mSync) {
return new ArrayMap<>(mIpConfigurations);
}
}
@Nullable
public IpConfiguration getIpConfigurationForDefaultInterface() {
return null;
}
}
|
