NetworkManager/src/core/settings/nm-settings-utils.c

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2019 Red Hat, Inc.
 */

#include "nm-default.h"

#include "nm-settings-utils.h"

#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

#include "nm-settings-plugin.h"

/*****************************************************************************/

const struct timespec *
nm_sett_util_stat_mtime(const char *filename, gboolean do_lstat, struct timespec *out_val)
{
    struct stat    st;
    struct timeval now_tv;

    if (filename) {
        if (do_lstat) {
            if (lstat(filename, &st) == 0) {
                *out_val = st.st_mtim;
                return out_val;
            }
        } else {
            if (stat(filename, &st) == 0) {
                *out_val = st.st_mtim;
                return out_val;
            }
        }
    }

    if (gettimeofday(&now_tv, NULL) == 0) {
        *out_val = (struct timespec){
            .tv_sec  = now_tv.tv_sec,
            .tv_nsec = now_tv.tv_usec * 1000u,
        };
        return out_val;
    }

    *out_val = (struct timespec){};
    return out_val;
}

/*****************************************************************************/

gboolean
nm_sett_util_allow_filename_cb(const char *filename, gpointer user_data)
{
    const NMSettUtilAllowFilenameData *allow_filename_data = user_data;

    if (allow_filename_data->allowed_filename
        && nm_streq(allow_filename_data->allowed_filename, filename))
        return TRUE;

    return !g_hash_table_contains(allow_filename_data->idx_by_filename, filename);
}

/*****************************************************************************/

void
nm_sett_util_storage_by_uuid_head_destroy(NMSettUtilStorageByUuidHead *sbuh)
{
    CList *iter;

    while ((iter = c_list_first(&sbuh->_storage_by_uuid_lst_head)))
        c_list_unlink(iter);
    g_free(sbuh);
}

/*****************************************************************************/

void
nm_sett_util_storages_clear(NMSettUtilStorages *storages)
{
    nm_clear_pointer(&storages->idx_by_uuid, g_hash_table_destroy);
    nm_clear_pointer(&storages->idx_by_filename, g_hash_table_destroy);
    nm_assert(c_list_is_empty(&storages->_storage_lst_head));
}

void
nm_sett_util_storages_add_take(NMSettUtilStorages *storages,
                               gpointer storage_take_p /* NMSettingsStorage *, take reference */)
{
    NMSettingsStorage *          storage_take = storage_take_p;
    NMSettUtilStorageByUuidHead *sbuh;
    const char *                 uuid;

    nm_assert(storage_take);
    nm_assert(c_list_is_empty(&storage_take->_storage_lst));
    nm_assert(c_list_is_empty(&storage_take->_storage_by_uuid_lst));
    nm_assert(nm_settings_storage_get_filename(storage_take));

    if (!g_hash_table_replace(storages->idx_by_filename,
                              (char *) nm_settings_storage_get_filename(storage_take),
                              storage_take /* takes ownership of reference. */))
        nm_assert_not_reached();

    uuid = nm_settings_storage_get_uuid_opt(storage_take);

    if (uuid) {
        sbuh = nm_sett_util_storages_lookup_by_uuid(storages, uuid);
        if (!sbuh) {
            gsize l = strlen(uuid) + 1;

            sbuh       = g_malloc(sizeof(NMSettUtilStorageByUuidHead) + l);
            sbuh->uuid = sbuh->uuid_data;
            c_list_init(&sbuh->_storage_by_uuid_lst_head);
            memcpy(sbuh->uuid_data, uuid, l);
            g_hash_table_add(storages->idx_by_uuid, sbuh);
        }
        c_list_link_tail(&sbuh->_storage_by_uuid_lst_head, &storage_take->_storage_by_uuid_lst);
    }

    c_list_link_tail(&storages->_storage_lst_head, &storage_take->_storage_lst);
}

gpointer /* NMSettingsStorage * */
nm_sett_util_storages_steal(NMSettUtilStorages *storages,
                            gpointer            storage_p /* NMSettingsStorage **/)
{
    NMSettingsStorage *          storage = storage_p;
    NMSettUtilStorageByUuidHead *sbuh;
    const char *                 uuid;

    nm_assert(storage);
    nm_assert(nm_sett_util_storages_lookup_by_filename(storages,
                                                       nm_settings_storage_get_filename(storage))
              == storage);
    nm_assert(c_list_contains(&storages->_storage_lst_head, &storage->_storage_lst));

    uuid = nm_settings_storage_get_uuid_opt(storage);

    if (!uuid) {
        nm_assert(c_list_is_empty(&storage->_storage_by_uuid_lst));
    } else {
        nm_assert(!c_list_is_empty(&storage->_storage_by_uuid_lst));

        sbuh = nm_sett_util_storages_lookup_by_uuid(storages, uuid);

        nm_assert(sbuh);
        nm_assert(
            c_list_contains(&sbuh->_storage_by_uuid_lst_head, &storage->_storage_by_uuid_lst));
        c_list_unlink(&storage->_storage_by_uuid_lst);

        if (c_list_is_empty(&sbuh->_storage_by_uuid_lst_head))
            g_hash_table_remove(storages->idx_by_uuid, sbuh);
    }

    c_list_unlink(&storage->_storage_lst);

    g_hash_table_steal(storages->idx_by_filename, nm_settings_storage_get_filename(storage));

    return storage;
}