Differential D10566 Diff 31188 src/wallet/walletutil.cpp

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src/wallet/walletutil.cpp

	// Copyright (c) 2017 The Bitcoin Core developers			// Copyright (c) 2017 The Bitcoin Core developers
	// Distributed under the MIT software license, see the accompanying			// Distributed under the MIT software license, see the accompanying
	// file COPYING or http://www.opensource.org/licenses/mit-license.php.			// file COPYING or http://www.opensource.org/licenses/mit-license.php.

	#include <wallet/walletutil.h>			#include <wallet/walletutil.h>

	#include <logging.h>			#include <logging.h>
	#include <util/system.h>			#include <util/system.h>

				bool ExistsBerkeleyDatabase(const fs::path &path);

	fs::path GetWalletDir() {			fs::path GetWalletDir() {
	fs::path path;			fs::path path;

	if (gArgs.IsArgSet("-walletdir")) {			if (gArgs.IsArgSet("-walletdir")) {
	path = gArgs.GetArg("-walletdir", "");			path = gArgs.GetArg("-walletdir", "");
	if (!fs::is_directory(path)) {			if (!fs::is_directory(path)) {
	// If the path specified doesn't exist, we return the deliberately			// If the path specified doesn't exist, we return the deliberately
	// invalid empty string.			// invalid empty string.
	path = "";			path = "";
	}			}
	} else {			} else {
	path = GetDataDir();			path = GetDataDir();
	// If a wallets directory exists, use that, otherwise default to			// If a wallets directory exists, use that, otherwise default to
	// GetDataDir			// GetDataDir
	if (fs::is_directory(path / "wallets")) {			if (fs::is_directory(path / "wallets")) {
	path /= "wallets";			path /= "wallets";
	}			}
	}			}

	return path;			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.
	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;
	}

	// 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() {			std::vector<fs::path> ListWalletDir() {
	const fs::path wallet_dir = GetWalletDir();			const fs::path wallet_dir = GetWalletDir();
	const size_t offset = wallet_dir.string().size() + 1;			const size_t offset = wallet_dir.string().size() + 1;
	std::vector<fs::path> paths;			std::vector<fs::path> paths;
	boost::system::error_code ec;			boost::system::error_code ec;

	for (auto it = fs::recursive_directory_iterator(wallet_dir, ec);			for (auto it = fs::recursive_directory_iterator(wallet_dir, ec);
	it != fs::recursive_directory_iterator(); it.increment(ec)) {			it != fs::recursive_directory_iterator(); it.increment(ec)) {
	if (ec) {			if (ec) {
	LogPrintf("%s: %s %s\n", __func__, ec.message(),			LogPrintf("%s: %s %s\n", __func__, ec.message(),
	it->path().string());			it->path().string());
	continue;			continue;
	}			}

	// Get wallet path relative to walletdir by removing walletdir from the			// Get wallet path relative to walletdir by removing walletdir from the
	// wallet path. This can be replaced by			// wallet path. This can be replaced by
	// boost::filesystem::lexically_relative once boost is bumped to 1.60.			// boost::filesystem::lexically_relative once boost is bumped to 1.60.
	const fs::path path = it->path().string().substr(offset);			const fs::path path = it->path().string().substr(offset);

	if (it->status().type() == fs::directory_file &&			if (it->status().type() == fs::directory_file &&
	IsBerkeleyBtree(it->path() / "wallet.dat")) {			ExistsBerkeleyDatabase(it->path())) {
	// Found a directory which contains wallet.dat btree file, add it as			// Found a directory which contains wallet.dat btree file, add it as
	// a wallet.			// a wallet.
	paths.emplace_back(path);			paths.emplace_back(path);
	} else if (it.level() == 0 &&			} else if (it.level() == 0 &&
	it->symlink_status().type() == fs::regular_file &&			it->symlink_status().type() == fs::regular_file &&
	IsBerkeleyBtree(it->path())) {			ExistsBerkeleyDatabase(it->path())) {
	if (it->path().filename() == "wallet.dat") {			if (it->path().filename() == "wallet.dat") {
	// Found top-level wallet.dat btree file, add top level			// Found top-level wallet.dat btree file, add top level
	// directory "" as a wallet.			// directory "" as a wallet.
	paths.emplace_back();			paths.emplace_back();
	} else {			} else {
	// Found top-level btree file not called wallet.dat. Current			// Found top-level btree file not called wallet.dat. Current
	// bitcoin software will never create these files but will allow			// bitcoin software will never create these files but will allow
	// them to be opened in a shared database environment for			// them to be opened in a shared database environment for
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