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
148
149
150
151
152
153
154
155
|
package se.leap.bitmaskclient.tor;
import android.content.Context;
import android.os.FileObserver;
import android.util.Log;
import androidx.annotation.Nullable;
import org.torproject.jni.ClientTransportPluginInterface;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.ref.WeakReference;
import java.util.Collection;
import java.util.HashMap;
import java.util.Scanner;
import java.util.Vector;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import IPtProxy.IPtProxy;
public class ClientTransportPlugin implements ClientTransportPluginInterface {
public static String TAG = ClientTransportPlugin.class.getSimpleName();
private HashMap<String, String> mFronts;
private final WeakReference<Context> contextRef;
private long snowflakePort = -1;
private FileObserver logFileObserver;
private static final Pattern SNOWFLAKE_LOG_TIMESTAMP_PATTERN = Pattern.compile("((19|2[0-9])[0-9]{2}\\/\\d{1,2}\\/\\d{1,2} \\d{1,2}:\\d{1,2}:\\d{1,2}) ([\\S|\\s]+)");
public ClientTransportPlugin(Context context) {
this.contextRef = new WeakReference<>(context);
loadCdnFronts(context);
}
@Override
public void start() {
Context context = contextRef.get();
if (context == null) {
return;
}
File logfile = new File(context.getApplicationContext().getCacheDir(), "snowflake.log");
Log.d(TAG, "logfile at " + logfile.getAbsolutePath());
try {
if (logfile.exists()) {
logfile.delete();
}
logfile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
//this is using the current, default Tor snowflake infrastructure
String target = getCdnFront("snowflake-target");
String front = getCdnFront("snowflake-front");
String stunServer = getCdnFront("snowflake-stun");
Log.d(TAG, "startSnowflake. target: " + target + ", front:" + front + ", stunServer" + stunServer);
snowflakePort = IPtProxy.startSnowflake( stunServer, target, front, logfile.getAbsolutePath(), false, false, true, 5);
Log.d(TAG, "startSnowflake running on port: " + snowflakePort);
watchLogFile(logfile);
}
private void watchLogFile(File logfile) {
final Vector<String> lastBuffer = new Vector<>();
logFileObserver = new FileObserver(logfile) {
@Override
public void onEvent(int event, @Nullable String name) {
if (FileObserver.MODIFY == event) {
try (Scanner scanner = new Scanner(logfile)) {
Vector<String> currentBuffer = new Vector<>();
while (scanner.hasNextLine()) {
currentBuffer.add(scanner.nextLine());
}
if (lastBuffer.size() < currentBuffer.size()) {
int startIndex = lastBuffer.size() > 0 ? lastBuffer.size() - 1 : 0;
int endIndex = currentBuffer.size() - 1;
Collection<String> newMessages = currentBuffer.subList(startIndex, endIndex);
for (String message : newMessages) {
logSnowflakeMessage(message);
}
lastBuffer.addAll(newMessages);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
};
logFileObserver.startWatching();
}
@Override
public void stop() {
IPtProxy.stopSnowflake();
snowflakePort = -1;
logFileObserver.stopWatching();
}
@Override
public String getTorrc() {
return "UseBridges 1\n" +
"ClientTransportPlugin snowflake socks5 127.0.0.1:" + snowflakePort + "\n" +
"Bridge snowflake 192.0.2.3:1";
}
private void loadCdnFronts(Context context) {
if (mFronts == null) {
mFronts = new HashMap<>();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(context.getAssets().open("fronts")));
String line;
while (true) {
line = reader.readLine();
if (line == null) break;
String[] front = line.split(" ");
mFronts.put(front[0], front[1]);
Log.d(TAG, "front: " + front[0] + ", " + front[1]);
}
} catch (IOException e) {
e.printStackTrace();
}
}
@Nullable
private String getCdnFront(String service) {
if (mFronts != null) {
return mFronts.get(service);
}
return null;
}
private void logSnowflakeMessage(String message) {
Matcher matcher = SNOWFLAKE_LOG_TIMESTAMP_PATTERN.matcher(message);
if (matcher.matches()) {
try {
String strippedString = matcher.group(3).trim();
Log.d(TAG, "log: " + message);
Log.d(TAG, "log stripped: " + strippedString);
if (strippedString.length() > 0) {
TorStatusObservable.logSnowflakeMessage(contextRef.get(), strippedString);
}
} catch (IndexOutOfBoundsException | IllegalStateException e) {
e.printStackTrace();
}
} else {
TorStatusObservable.logSnowflakeMessage(contextRef.get(), message);
}
}
}
|
