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Determine wallet file type based on file magic

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This commit is contained in:
Andrew Chow
2020-05-26 20:54:05 -04:00
parent 6045f77003
commit ac38a87225
7 changed files with 83 additions and 30 deletions
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31
src/wallet/walletutil.cpp
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@@ -7,6 +7,8 @@
#include <logging.h>
#include <util/system.h>
bool ExistsBerkeleyDatabase(const fs::path& path);
fs::path GetWalletDir()
{
fs::path path;
@@ -29,31 +31,6 @@ fs::path GetWalletDir()
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;
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();
@@ -71,10 +48,10 @@ std::vector<fs::path> ListWalletDir()
// 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")) {
if (it->status().type() == fs::directory_file && ExistsBerkeleyDatabase(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 && IsBerkeleyBtree(it->path())) {
} else if (it.level() == 0 && it->symlink_status().type() == fs::regular_file && ExistsBerkeleyDatabase(it->path())) {
if (it->path().filename() == "wallet.dat") {
// Found top-level wallet.dat btree file, add top level directory ""
// as a wallet.