Differential D5534 Diff 17103 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 <util/system.h>

	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;
	}			}

	static bool IsBerkeleyBtree(const fs::path &path) {
	// A Berkeley DB Btree file has at least 4K.
	// This check also prevents opening lock files.
	boost::system::error_code ec;
	if (fs::file_size(path, ec) < 4096) {
	return false;
	}

	fs::ifstream file(path.string(), 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();
	std::vector<fs::path> paths;

	for (auto it = fs::recursive_directory_iterator(wallet_dir); it != end(it);
	++it) {
	if (it->status().type() == fs::directory_file &&
	IsBerkeleyBtree(it->path() / "wallet.dat")) {
	// Found a directory which contains wallet.dat btree file, add it as
	// a wallet.
	paths.emplace_back(fs::relative(it->path(), wallet_dir));
	} else if (it.level() == 0 &&
	it->symlink_status().type() == fs::regular_file &&
	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(fs::relative(it->path(), wallet_dir));
	}
	}
	}

	return paths;
	}

	WalletLocation::WalletLocation(const std::string &name)			WalletLocation::WalletLocation(const std::string &name)
	: m_name(name), m_path(fs::absolute(name, GetWalletDir())) {}			: m_name(name), m_path(fs::absolute(name, GetWalletDir())) {}

	bool WalletLocation::Exists() const {			bool WalletLocation::Exists() const {
	return fs::symlink_status(m_path).type() != fs::file_not_found;			return fs::symlink_status(m_path).type() != fs::file_not_found;
	}			}