1/*
2 * src/nl-link-name2ifindex.c     Transform a interface name to its index
3 *
4 *	This library is free software; you can redistribute it and/or
5 *	modify it under the terms of the GNU Lesser General Public
6 *	License as published by the Free Software Foundation version 2.1
7 *	of the License.
8 *
9 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
10 */
11
12#include <netlink/cli/utils.h>
13#include <netlink/cli/link.h>
14
15static void print_usage(void)
16{
17	printf("Usage: nl-link-ifindex2name <ifindex>\n");
18	exit(0);
19}
20
21int main(int argc, char *argv[])
22{
23	struct nl_sock *sock;
24	struct nl_cache *link_cache;
25	uint32_t ifindex;
26
27	if (argc < 2)
28		print_usage();
29
30	sock = nl_cli_alloc_socket();
31	nl_cli_connect(sock, NETLINK_ROUTE);
32	link_cache = nl_cli_link_alloc_cache(sock);
33
34	if (!(ifindex = rtnl_link_name2i(link_cache, argv[1])))
35		nl_cli_fatal(ENOENT, "Interface \"%s\" does not exist",
36			     argv[1]);
37
38	printf("%u\n", ifindex);
39
40	return 0;
41}
42