Magisk/native/src/core/package.cpp

#include <base.hpp>
#include <consts.hpp>
#include <core.hpp>
#include <sqlite.hpp>
#include <flags.h>

using namespace std;

// app_id = app_no + AID_APP_START
// app_no range: [0, 9999]
vector<bool> get_app_no_list() {
    vector<bool> list;
    auto data_dir = xopen_dir(APP_DATA_DIR);
    if (!data_dir)
        return list;
    dirent *entry;
    while ((entry = xreaddir(data_dir.get()))) {
        // For each user
        int dfd = xopenat(dirfd(data_dir.get()), entry->d_name, O_RDONLY);
        if (auto dir = xopen_dir(dfd)) {
            while ((entry = xreaddir(dir.get()))) {
                // For each package
                struct stat st{};
                xfstatat(dfd, entry->d_name, &st, 0);
                int app_id = to_app_id(st.st_uid);
                if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
                    int app_no = app_id - AID_APP_START;
                    if (list.size() <= app_no) {
                        list.resize(app_no + 1);
                    }
                    list[app_no] = true;
                }
            }
        } else {
            close(dfd);
        }
    }
    return list;
}