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/*-
* Copyright 2022 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#ifdef WITH_HYPERSCAN
#include <string>
#include "contrib/ankerl/unordered_dense.h"
#include "contrib/ankerl/svector.h"
#include "fmt/core.h"
#include <glob.h> /* for glob */
#include <sys/stat.h> /* for stat */
#include <unistd.h> /* for unlink */
namespace rspamd::util {
class hs_known_files_cache {
private:
// These fields are filled when we add new known cache files
ankerl::svector<std::string, 4> cache_dirs;
ankerl::svector<std::string, 8> cache_extensions;
ankerl::unordered_dense::set<std::string> known_cached_files;
bool need_cleanup = false;
private:
hs_known_files_cache() = default;
virtual ~hs_known_files_cache() {
// Cleanup cache dir
if (need_cleanup) {
auto cleanup_dir = [&](std::string_view dir) -> void {
for (const auto &ext : cache_extensions) {
glob_t globbuf;
auto glob_pattern = fmt::format("{}{}*.{}",
dir, G_DIR_SEPARATOR_S, ext);
memset(&globbuf, 0, sizeof(globbuf));
if (glob(glob_pattern.c_str(), 0, nullptr, &globbuf) == 0) {
for (auto i = 0; i < globbuf.gl_pathc; i++) {
const auto *path = globbuf.gl_pathv[i];
struct stat st;
if (stat(path, &st) == -1) {
continue;
}
if (S_ISREG(st.st_mode)) {
if (!known_cached_files.contains(path)) {
unlink(path);
}
}
}
}
globfree(&globbuf);
}
};
for (const auto &dir: cache_dirs) {
cleanup_dir(dir);
}
}
}
public:
hs_known_files_cache(const hs_known_files_cache &) = delete;
hs_known_files_cache(hs_known_files_cache &&) = delete;
static auto get(bool need_cleanup) -> hs_known_files_cache& {
static hs_known_files_cache *singleton = nullptr;
if (singleton == nullptr) {
singleton = new hs_known_files_cache;
singleton->need_cleanup = need_cleanup;
}
return *singleton;
}
};
} // namespace rspamd::util
#endif
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