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-rw-r--r--src/wallet/db.cpp117
1 files changed, 112 insertions, 5 deletions
diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index bd1d114730..cd49baeb78 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -3,23 +3,130 @@
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#include <chainparams.h>
#include <fs.h>
+#include <logging.h>
#include <wallet/db.h>
#include <string>
-void SplitWalletPath(const fs::path& wallet_path, fs::path& env_directory, std::string& database_filename)
+std::vector<fs::path> ListDatabases(const fs::path& wallet_dir)
+{
+ const size_t offset = wallet_dir.string().size() + 1;
+ std::vector<fs::path> paths;
+ boost::system::error_code ec;
+
+ for (auto it = fs::recursive_directory_iterator(wallet_dir, ec); it != fs::recursive_directory_iterator(); it.increment(ec)) {
+ if (ec) {
+ LogPrintf("%s: %s %s\n", __func__, ec.message(), it->path().string());
+ continue;
+ }
+
+ try {
+ // Get wallet path relative to walletdir by removing walletdir from the wallet path.
+ // This can be replaced by boost::filesystem::lexically_relative once boost is bumped to 1.60.
+ const fs::path path = it->path().string().substr(offset);
+
+ if (it->status().type() == fs::directory_file &&
+ (IsBDBFile(BDBDataFile(it->path())) || IsSQLiteFile(SQLiteDataFile(it->path())))) {
+ // Found a directory which contains wallet.dat btree file, add it as a wallet.
+ paths.emplace_back(path);
+ } else if (it.level() == 0 && it->symlink_status().type() == fs::regular_file && IsBDBFile(it->path())) {
+ if (it->path().filename() == "wallet.dat") {
+ // Found top-level wallet.dat btree file, add top level directory ""
+ // as a wallet.
+ paths.emplace_back();
+ } else {
+ // Found top-level btree file not called wallet.dat. Current bitcoin
+ // software will never create these files but will allow them to be
+ // opened in a shared database environment for backwards compatibility.
+ // Add it to the list of available wallets.
+ paths.emplace_back(path);
+ }
+ }
+ } catch (const std::exception& e) {
+ LogPrintf("%s: Error scanning %s: %s\n", __func__, it->path().string(), e.what());
+ it.no_push();
+ }
+ }
+
+ return paths;
+}
+
+fs::path BDBDataFile(const fs::path& wallet_path)
{
if (fs::is_regular_file(wallet_path)) {
// Special case for backwards compatibility: if wallet path points to an
// existing file, treat it as the path to a BDB data file in a parent
// directory that also contains BDB log files.
- env_directory = wallet_path.parent_path();
- database_filename = wallet_path.filename().string();
+ return wallet_path;
} else {
// Normal case: Interpret wallet path as a directory path containing
// data and log files.
- env_directory = wallet_path;
- database_filename = "wallet.dat";
+ return wallet_path / "wallet.dat";
}
}
+
+fs::path SQLiteDataFile(const fs::path& path)
+{
+ return path / "wallet.dat";
+}
+
+bool IsBDBFile(const fs::path& path)
+{
+ if (!fs::exists(path)) return false;
+
+ // A Berkeley DB Btree file has at least 4K.
+ // This check also prevents opening lock files.
+ boost::system::error_code ec;
+ auto size = fs::file_size(path, ec);
+ if (ec) LogPrintf("%s: %s %s\n", __func__, ec.message(), path.string());
+ if (size < 4096) return false;
+
+ fsbridge::ifstream file(path, std::ios::binary);
+ if (!file.is_open()) return false;
+
+ file.seekg(12, std::ios::beg); // Magic bytes start at offset 12
+ uint32_t data = 0;
+ file.read((char*) &data, sizeof(data)); // Read 4 bytes of file to compare against magic
+
+ // Berkeley DB Btree magic bytes, from:
+ // https://github.com/file/file/blob/5824af38469ec1ca9ac3ffd251e7afe9dc11e227/magic/Magdir/database#L74-L75
+ // - big endian systems - 00 05 31 62
+ // - little endian systems - 62 31 05 00
+ return data == 0x00053162 || data == 0x62310500;
+}
+
+bool IsSQLiteFile(const fs::path& path)
+{
+ if (!fs::exists(path)) return false;
+
+ // A SQLite Database file is at least 512 bytes.
+ boost::system::error_code ec;
+ auto size = fs::file_size(path, ec);
+ if (ec) LogPrintf("%s: %s %s\n", __func__, ec.message(), path.string());
+ if (size < 512) return false;
+
+ fsbridge::ifstream file(path, std::ios::binary);
+ if (!file.is_open()) return false;
+
+ // Magic is at beginning and is 16 bytes long
+ char magic[16];
+ file.read(magic, 16);
+
+ // Application id is at offset 68 and 4 bytes long
+ file.seekg(68, std::ios::beg);
+ char app_id[4];
+ file.read(app_id, 4);
+
+ file.close();
+
+ // Check the magic, see https://sqlite.org/fileformat2.html
+ std::string magic_str(magic, 16);
+ if (magic_str != std::string("SQLite format 3", 16)) {
+ return false;
+ }
+
+ // Check the application id matches our network magic
+ return memcmp(Params().MessageStart(), app_id, 4) == 0;
+}