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1 office 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  
15 static void print_usage(void)
16 {
17 printf("Usage: nl-link-ifindex2name <ifindex>\n");
18 exit(0);
19 }
20  
21 int 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 }