Branch data Line data Source code
1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-2021 The Bitcoin Core developers
3 : : // Distributed under the MIT software license, see the accompanying
4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 : :
6 : : #include <chainparams.h>
7 : : #include <common/args.h>
8 : : #include <logging.h>
9 : : #include <util/fs.h>
10 : : #include <wallet/db.h>
11 : :
12 : : #include <exception>
13 : : #include <fstream>
14 : : #include <string>
15 : : #include <system_error>
16 : : #include <vector>
17 : :
18 : : namespace wallet {
19 : 0 : std::vector<fs::path> ListDatabases(const fs::path& wallet_dir)
20 : : {
21 : 0 : std::vector<fs::path> paths;
22 : 0 : std::error_code ec;
23 : :
24 [ # # # # : 0 : for (auto it = fs::recursive_directory_iterator(wallet_dir, ec); it != fs::recursive_directory_iterator(); it.increment(ec)) {
# # ]
25 [ # # ]: 0 : if (ec) {
26 [ # # # # ]: 0 : if (fs::is_directory(*it)) {
27 : 0 : it.disable_recursion_pending();
28 [ # # # # : 0 : LogPrintf("%s: %s %s -- skipping.\n", __func__, ec.message(), fs::PathToString(it->path()));
# # # # #
# # # #
# ]
29 : 0 : } else {
30 [ # # # # : 0 : LogPrintf("%s: %s %s\n", __func__, ec.message(), fs::PathToString(it->path()));
# # # # #
# # # #
# ]
31 : : }
32 : 0 : continue;
33 : : }
34 : :
35 : : try {
36 [ # # # # ]: 0 : const fs::path path{it->path().lexically_relative(wallet_dir)};
37 : :
38 [ # # # # : 0 : if (it->status().type() == fs::file_type::directory &&
# # # # #
# # # # #
# # # # #
# # # # #
# # # # #
# ]
39 [ # # # # : 0 : (IsBDBFile(BDBDataFile(it->path())) || IsSQLiteFile(SQLiteDataFile(it->path())))) {
# # # # #
# # # # #
# # # # ]
40 : : // Found a directory which contains wallet.dat btree file, add it as a wallet.
41 [ # # ]: 0 : paths.emplace_back(path);
42 [ # # # # : 0 : } else if (it.depth() == 0 && it->symlink_status().type() == fs::file_type::regular && IsBDBFile(it->path())) {
# # # # #
# # # # #
# # # # #
# # # ]
43 [ # # # # : 0 : if (it->path().filename() == "wallet.dat") {
# # ]
44 : : // Found top-level wallet.dat btree file, add top level directory ""
45 : : // as a wallet.
46 [ # # ]: 0 : paths.emplace_back();
47 : 0 : } else {
48 : : // Found top-level btree file not called wallet.dat. Current bitcoin
49 : : // software will never create these files but will allow them to be
50 : : // opened in a shared database environment for backwards compatibility.
51 : : // Add it to the list of available wallets.
52 [ # # ]: 0 : paths.emplace_back(path);
53 : : }
54 : 0 : }
55 [ # # ]: 0 : } catch (const std::exception& e) {
56 [ # # # # : 0 : LogPrintf("%s: Error scanning %s: %s\n", __func__, fs::PathToString(it->path()), e.what());
# # # # #
# # # ]
57 : 0 : it.disable_recursion_pending();
58 [ # # # # ]: 0 : }
59 : 0 : }
60 : :
61 : 0 : return paths;
62 [ # # ]: 0 : }
63 : :
64 : 0 : fs::path BDBDataFile(const fs::path& wallet_path)
65 : : {
66 [ # # ]: 0 : if (fs::is_regular_file(wallet_path)) {
67 : : // Special case for backwards compatibility: if wallet path points to an
68 : : // existing file, treat it as the path to a BDB data file in a parent
69 : : // directory that also contains BDB log files.
70 : 0 : return wallet_path;
71 : : } else {
72 : : // Normal case: Interpret wallet path as a directory path containing
73 : : // data and log files.
74 [ # # ]: 2 : return wallet_path / "wallet.dat";
75 : : }
76 : 0 : }
77 : :
78 : 0 : fs::path SQLiteDataFile(const fs::path& path)
79 : : {
80 [ # # ]: 0 : return path / "wallet.dat";
81 : 0 : }
82 : :
83 : 0 : bool IsBDBFile(const fs::path& path)
84 : : {
85 [ # # ]: 0 : if (!fs::exists(path)) return false;
86 : :
87 : : // A Berkeley DB Btree file has at least 4K.
88 : : // This check also prevents opening lock files.
89 : 0 : std::error_code ec;
90 : 0 : auto size = fs::file_size(path, ec);
91 [ # # # # : 0 : if (ec) LogPrintf("%s: %s %s\n", __func__, ec.message(), fs::PathToString(path));
# # # # #
# # # ]
92 [ # # ]: 0 : if (size < 4096) return false;
93 : :
94 : 0 : std::ifstream file{path, std::ios::binary};
95 [ # # # # ]: 0 : if (!file.is_open()) return false;
96 : :
97 [ # # ]: 0 : file.seekg(12, std::ios::beg); // Magic bytes start at offset 12
98 : 0 : uint32_t data = 0;
99 [ # # ]: 0 : file.read((char*) &data, sizeof(data)); // Read 4 bytes of file to compare against magic
100 : :
101 : : // Berkeley DB Btree magic bytes, from:
102 : : // https://github.com/file/file/blob/5824af38469ec1ca9ac3ffd251e7afe9dc11e227/magic/Magdir/database#L74-L75
103 : : // - big endian systems - 00 05 31 62
104 : : // - little endian systems - 62 31 05 00
105 [ # # ]: 0 : return data == 0x00053162 || data == 0x62310500;
106 : 0 : }
107 : :
108 : 0 : bool IsSQLiteFile(const fs::path& path)
109 : : {
110 [ # # ]: 0 : if (!fs::exists(path)) return false;
111 : :
112 : : // A SQLite Database file is at least 512 bytes.
113 : 0 : std::error_code ec;
114 : 0 : auto size = fs::file_size(path, ec);
115 [ # # # # : 0 : if (ec) LogPrintf("%s: %s %s\n", __func__, ec.message(), fs::PathToString(path));
# # # # #
# # # ]
116 [ # # ]: 0 : if (size < 512) return false;
117 : :
118 : 0 : std::ifstream file{path, std::ios::binary};
119 [ # # # # ]: 0 : if (!file.is_open()) return false;
120 : :
121 : : // Magic is at beginning and is 16 bytes long
122 : : char magic[16];
123 [ # # ]: 0 : file.read(magic, 16);
124 : :
125 : : // Application id is at offset 68 and 4 bytes long
126 [ # # ]: 0 : file.seekg(68, std::ios::beg);
127 : : char app_id[4];
128 [ # # ]: 0 : file.read(app_id, 4);
129 : :
130 [ # # ]: 0 : file.close();
131 : :
132 : : // Check the magic, see https://sqlite.org/fileformat2.html
133 [ # # ]: 0 : std::string magic_str(magic, 16);
134 [ # # # # ]: 0 : if (magic_str != std::string("SQLite format 3", 16)) {
135 : 0 : return false;
136 : : }
137 : :
138 : : // Check the application id matches our network magic
139 [ # # # # ]: 0 : return memcmp(Params().MessageStart().data(), app_id, 4) == 0;
140 : 0 : }
141 : :
142 : 0 : void ReadDatabaseArgs(const ArgsManager& args, DatabaseOptions& options)
143 : : {
144 : : // Override current options with args values, if any were specified
145 [ # # # # ]: 0 : options.use_unsafe_sync = args.GetBoolArg("-unsafesqlitesync", options.use_unsafe_sync);
146 [ # # # # ]: 0 : options.use_shared_memory = !args.GetBoolArg("-privdb", !options.use_shared_memory);
147 [ # # # # ]: 0 : options.max_log_mb = args.GetIntArg("-dblogsize", options.max_log_mb);
148 : 0 : }
149 : :
150 : : } // namespace wallet
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