libnl  3.7.0
nl-link-ifindex2name.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3  * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
4  */
5 
6 #include <netlink/cli/utils.h>
7 #include <netlink/cli/link.h>
8 
9 #include <linux/netlink.h>
10 
11 static void print_usage(void)
12 {
13  printf("Usage: nl-link-ifindex2name <ifindex>\n");
14  exit(0);
15 }
16 
17 int main(int argc, char *argv[])
18 {
19  struct nl_sock *sock;
20  struct nl_cache *link_cache;
21  char name[IFNAMSIZ];
22  uint32_t ifindex;
23 
24  if (argc < 2)
25  print_usage();
26 
27  sock = nl_cli_alloc_socket();
28  nl_cli_connect(sock, NETLINK_ROUTE);
29  link_cache = nl_cli_link_alloc_cache(sock);
30 
31  ifindex = nl_cli_parse_u32(argv[1]);
32 
33  if (!rtnl_link_i2name(link_cache, ifindex, name, sizeof(name)))
34  nl_cli_fatal(ENOENT, "Interface index %d does not exist",
35  ifindex);
36 
37  printf("%s\n", name);
38 
39  return 0;
40 }
void nl_cli_fatal(int err, const char *fmt,...)
Print error message and quit application.
Definition: utils.c:71
uint32_t nl_cli_parse_u32(const char *arg)
Parse a text based 32 bit unsigned integer argument.
Definition: utils.c:36