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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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27
src/wallet/bdb.cpp
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@@ -813,7 +813,7 @@ bool ExistsBerkeleyDatabase(const fs::path& path)
fs::path env_directory;
std::string data_filename;
SplitWalletPath(path, env_directory, data_filename);
return IsBerkeleyBtree(env_directory / data_filename);
return IsBDBFile(env_directory / data_filename);
}
std::unique_ptr<BerkeleyDatabase> MakeBerkeleyDatabase(const fs::path& path, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error)
@@ -839,3 +839,28 @@ std::unique_ptr<BerkeleyDatabase> MakeBerkeleyDatabase(const fs::path& path, con
status = DatabaseStatus::SUCCESS;
return db;
}
bool IsBDBFile(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;
}