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// Copyright (c) 2017-2018 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 <util/system.h>
fs::path GetWalletDir()
{
fs::path path;
if (gArgs.IsArgSet("-walletdir")) {
path = gArgs.GetArg("-walletdir", "");
if (!fs::is_directory(path)) {
// If the path specified doesn't exist, we return the deliberately
// invalid empty string.
path = "";
}
} else {
path = GetDataDir();
// If a wallets directory exists, use that, otherwise default to GetDataDir
if (fs::is_directory(path / "wallets")) {
path /= "wallets";
}
}
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;
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;
}
std::vector<fs::path> ListWalletDir()
{
const fs::path wallet_dir = GetWalletDir();
const size_t offset = wallet_dir.string().size() + 1;
std::vector<fs::path> paths;
for (auto it = fs::recursive_directory_iterator(wallet_dir); it != fs::recursive_directory_iterator(); ++it) {
// 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 && 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.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(path);
}
}
}
return paths;
}
WalletLocation::WalletLocation(const std::string& name)
: m_name(name)
, m_path(fs::absolute(name, GetWalletDir()))
{
}
bool WalletLocation::Exists() const
{
return fs::symlink_status(m_path).type() != fs::file_not_found;
}
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