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1 | /* |
2 | * Copyright (C) 2012 Tobias Brunner | |
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3 | * |
4 | * Copyright (C) secunet Security Networks AG | |
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5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
13 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | * for more details. | |
15 | */ | |
16 | ||
17 | package org.strongswan.android.data; | |
18 | ||
19 | import java.io.File; | |
20 | import java.io.FileNotFoundException; | |
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21 | import java.security.NoSuchAlgorithmException; |
22 | import java.security.SecureRandom; | |
23 | import java.util.concurrent.ConcurrentHashMap; | |
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24 | |
25 | import org.strongswan.android.logic.CharonVpnService; | |
26 | ||
27 | import android.content.ContentProvider; | |
28 | import android.content.ContentValues; | |
29 | import android.database.Cursor; | |
30 | import android.database.MatrixCursor; | |
31 | import android.net.Uri; | |
32 | import android.os.ParcelFileDescriptor; | |
064f4f75 | 33 | import android.os.SystemClock; |
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34 | import android.provider.OpenableColumns; |
35 | ||
36 | public class LogContentProvider extends ContentProvider | |
37 | { | |
38 | private static final String AUTHORITY = "org.strongswan.android.content.log"; | |
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39 | /* an Uri is valid for 30 minutes */ |
40 | private static final long URI_VALIDITY = 30 * 60 * 1000; | |
41 | private static ConcurrentHashMap<Uri, Long> mUris = new ConcurrentHashMap<Uri, Long>(); | |
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42 | private File mLogFile; |
43 | ||
44 | public LogContentProvider() | |
45 | { | |
46 | } | |
47 | ||
48 | @Override | |
49 | public boolean onCreate() | |
50 | { | |
51 | mLogFile = new File(getContext().getFilesDir(), CharonVpnService.LOG_FILE); | |
52 | return true; | |
53 | } | |
54 | ||
55 | /** | |
56 | * The log file can only be accessed by Uris created with this method | |
57 | * @return null if failed to create the Uri | |
58 | */ | |
59 | public static Uri createContentUri() | |
60 | { | |
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61 | SecureRandom random; |
62 | try | |
63 | { | |
64 | random = SecureRandom.getInstance("SHA1PRNG"); | |
65 | } | |
66 | catch (NoSuchAlgorithmException e) | |
67 | { | |
68 | return null; | |
69 | } | |
70 | Uri uri = Uri.parse("content://" + AUTHORITY + "/" + random.nextLong()); | |
71 | mUris.put(uri, SystemClock.uptimeMillis()); | |
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72 | return uri; |
73 | } | |
74 | ||
75 | @Override | |
76 | public String getType(Uri uri) | |
77 | { | |
78 | /* MIME type for our log file */ | |
79 | return "text/plain"; | |
80 | } | |
81 | ||
82 | @Override | |
83 | public Cursor query(Uri uri, String[] projection, String selection, | |
84 | String[] selectionArgs, String sortOrder) | |
85 | { | |
86 | /* this is called by apps to find out the name and size of the file. | |
87 | * since we only provide a single file this is simple to implement */ | |
88 | if (projection == null || projection.length < 1) | |
89 | { | |
90 | return null; | |
91 | } | |
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92 | Long timestamp = mUris.get(uri); |
93 | if (timestamp == null) | |
94 | { /* don't check the validity as this information is not really private */ | |
95 | return null; | |
96 | } | |
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97 | MatrixCursor cursor = new MatrixCursor(projection, 1); |
98 | if (OpenableColumns.DISPLAY_NAME.equals(cursor.getColumnName(0))) | |
99 | { | |
100 | cursor.newRow().add(CharonVpnService.LOG_FILE); | |
101 | } | |
102 | else if (OpenableColumns.SIZE.equals(cursor.getColumnName(0))) | |
103 | { | |
104 | cursor.newRow().add(mLogFile.length()); | |
105 | } | |
106 | else | |
107 | { | |
108 | return null; | |
109 | } | |
110 | return cursor; | |
111 | } | |
112 | ||
113 | @Override | |
114 | public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException | |
115 | { | |
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116 | Long timestamp = mUris.get(uri); |
117 | if (timestamp != null) | |
118 | { | |
119 | long elapsed = SystemClock.uptimeMillis() - timestamp; | |
120 | if (elapsed > 0 && elapsed < URI_VALIDITY) | |
121 | { /* we fail if clock wrapped, should happen rarely though */ | |
122 | return ParcelFileDescriptor.open(mLogFile, ParcelFileDescriptor.MODE_CREATE | ParcelFileDescriptor.MODE_READ_ONLY); | |
123 | } | |
124 | mUris.remove(uri); | |
125 | } | |
126 | return super.openFile(uri, mode); | |
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127 | } |
128 | ||
129 | @Override | |
130 | public Uri insert(Uri uri, ContentValues values) | |
131 | { | |
132 | /* not supported */ | |
133 | return null; | |
134 | } | |
135 | ||
136 | @Override | |
137 | public int delete(Uri uri, String selection, String[] selectionArgs) | |
138 | { | |
139 | /* not supported */ | |
140 | return 0; | |
141 | } | |
142 | ||
143 | @Override | |
144 | public int update(Uri uri, ContentValues values, String selection, | |
145 | String[] selectionArgs) | |
146 | { | |
147 | /* not supported */ | |
148 | return 0; | |
149 | } | |
150 | } |