nl-link-ifindex2name.c

/* SPDX-License-Identifier: LGPL-2.1-only */
/*
 * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
 */
 
#include <netlink/cli/utils.h>
#include <netlink/cli/link.h>
 
#include <linux/netlink.h>
 
static void print_usage(void)
{
        printf("Usage: nl-link-ifindex2name <ifindex>\n");
        exit(0);
}
 
int main(int argc, char *argv[])
{
        struct nl_sock *sock;
        struct nl_cache *link_cache;
        char name[IFNAMSIZ];
        uint32_t ifindex;
 
        if (argc < 2)
                print_usage();
 
        sock = nl_cli_alloc_socket();
        nl_cli_connect(sock, NETLINK_ROUTE);
        link_cache = nl_cli_link_alloc_cache(sock);
 
        ifindex = nl_cli_parse_u32(argv[1]);
 
        if (!rtnl_link_i2name(link_cache, ifindex, name, sizeof(name)))
                nl_cli_fatal(ENOENT, "Interface index %d does not exist",
                             ifindex);
 
        printf("%s\n", name);
 
        return 0;
}