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walletutil.cpp
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walletutil.cpp
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// Copyright (c) 2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <wallet/walletutil.h>
#include <common/args.h>
#include <logging.h>
#include <exception>
#include <fstream>
fs::path GetWalletDir() {
fs::path path;
if (gArgs.IsArgSet("-walletdir")) {
path = gArgs.GetPathArg("-walletdir");
if (!fs::is_directory(path)) {
// If the path specified doesn't exist, we return the deliberately
// invalid empty string.
path = "";
}
} else {
path = gArgs.GetDataDirNet();
// If a wallets directory exists, use that, otherwise default to
// GetDataDir
if (fs::is_directory(path / "wallets")) {
path /= "wallets";
}
}
return path;
}
bool IsBerkeleyBtree(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.
std::error_code ec;
auto size = fs::file_size(path, ec);
if (ec) {
LogPrintf("%s: %s %s\n", __func__, ec.message(),
fs::PathToString(path));
}
if (size < 4096) {
return false;
}
std::ifstream file{path, std::ios::binary};
if (!file.is_open()) {
return false;
}
// Magic bytes start at offset 12
file.seekg(12, std::ios::beg);
uint32_t data = 0;
// Read 4 bytes of file to compare against magic
file.read((char *)&data, sizeof(data));
// 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;
}
std::vector<fs::path> ListWalletDir() {
const fs::path wallet_dir = GetWalletDir();
const size_t offset = fs::PathToString(wallet_dir).size() + 1;
std::vector<fs::path> paths;
std::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(),
fs::PathToString(it->path()));
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 auto path_str = it->path().native().substr(offset);
const fs::path path{path_str.begin(), path_str.end()};
if (it->status().type() == fs::file_type::directory &&
IsBerkeleyBtree(it->path() / "wallet.dat")) {
// Found a directory which contains wallet.dat btree file, add
// it as a wallet.
paths.emplace_back(path);
} else if (it.depth() == 0 &&
it->symlink_status().type() == fs::file_type::regular &&
IsBerkeleyBtree(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.disable_recursion_pending();
}
}
return paths;
}

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