/* SPDX-License-Identifier: LGPL-2.1-only */

/*

 * src/nl-link-name2ifindex.c     Transform a interface name to its index

 *

 *	This library is free software; you can redistribute it and/or

 *	modify it under the terms of the GNU Lesser General Public

 *	License as published by the Free Software Foundation version 2.1

 *	of the License.

 *

 * Copyright (c) 2003-2008 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-name2ifindex <name>\n");

	exit(0);

}

int main(int argc, char *argv[])

{

	struct nl_sock *sock;

	struct nl_cache *link_cache;

	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);

	if (!(ifindex = rtnl_link_name2i(link_cache, argv[1])))

		nl_cli_fatal(ENOENT, "Interface \"%s\" does not exist",

			     argv[1]);

	printf("%u\n", ifindex);

	return 0;

}