1 /*
2  * src/nl-link-ifindex2name.c     Transform a interface index to its name
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) 2003-2009 Thomas Graf <tgraf@suug.ch>
10  */
11 
12 #include <netlink/cli/utils.h>
13 #include <netlink/cli/link.h>
14 
print_usage(void)15 static void print_usage(void)
16 {
17 	printf("Usage: nl-link-ifindex2name <ifindex>\n");
18 	exit(0);
19 }
20 
main(int argc,char * argv[])21 int main(int argc, char *argv[])
22 {
23 	struct nl_sock *sock;
24 	struct nl_cache *link_cache;
25 	char name[IFNAMSIZ];
26 	uint32_t ifindex;
27 
28 	if (argc < 2)
29 		print_usage();
30 
31 	sock = nl_cli_alloc_socket();
32 	nl_cli_connect(sock, NETLINK_ROUTE);
33 	link_cache = nl_cli_link_alloc_cache(sock);
34 
35 	ifindex = nl_cli_parse_u32(argv[1]);
36 
37 	if (!rtnl_link_i2name(link_cache, ifindex, name, sizeof(name)))
38 		nl_cli_fatal(ENOENT, "Interface index %d does not exist",
39 			     ifindex);
40 
41 	printf("%s\n", name);
42 
43 	return 0;
44 }
45