str_array.c

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * (C) 2024 Red Hat GmbH
 * Author: Phil Sutter <phil@nwl.cc>
 */
#include <libmnl/libmnl.h>
#include <linux/netfilter/nf_tables.h>

#include "str_array.h"
#include "utils.h"

void nftnl_str_array_clear(struct nftnl_str_array *sa)
{
        while (sa->len > 0)
                free(sa->array[--sa->len]);
        free(sa->array);
}

int nftnl_str_array_set(struct nftnl_str_array *sa, const char * const *array)
{
        int len = 0;

        while (array[len])
                len++;

        nftnl_str_array_clear(sa);
        sa->array = calloc(len + 1, sizeof(char *));
        if (!sa->array)
                return -1;

        while (sa->len < len) {
                sa->array[sa->len] = strdup(array[sa->len]);
                if (!sa->array[sa->len]) {
                        nftnl_str_array_clear(sa);
                        return -1;
                }
                sa->len++;
        }
        return 0;
}

int nftnl_parse_devs(struct nftnl_str_array *sa, const struct nlattr *nest)
{
        struct nlattr *attr;
        int len = 0;

        mnl_attr_for_each_nested(attr, nest) {
                switch(mnl_attr_get_type(attr)) {
                default:
                        return -1;
                case NFTA_DEVICE_NAME:
                case NFTA_DEVICE_PREFIX:
                        len++;
                }
        }

        nftnl_str_array_clear(sa);
        sa->array = calloc(len + 1, sizeof(char *));
        if (!sa->array)
                return -1;

        mnl_attr_for_each_nested(attr, nest) {
                sa->array[sa->len] = nftnl_attr_get_ifname(attr);
                if (!sa->array[sa->len]) {
                        nftnl_str_array_clear(sa);
                        return -1;
                }
                sa->len++;
        }
        return 0;
}