libnl: /data/src/libnl3/src/nl-link-ifindex2name.c Source File

libnl 3.10.0

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 "nl-default.h"
7
8#include <linux/netlink.h>
9
10#include <netlink/cli/utils.h>
11#include <netlink/cli/link.h>
12
13static void print_usage(void)
14{
15 printf("Usage: nl-link-ifindex2name <ifindex>\n");
16 exit(0);
17}
18
19int main(int argc, char *argv[])
20{
21 struct nl_sock *sock;
22 struct nl_cache *link_cache;
23 char name[IFNAMSIZ];
24 uint32_t ifindex;
25
26 if (argc < 2)
27 print_usage();
28
29 sock = nl_cli_alloc_socket();
30 nl_cli_connect(sock, NETLINK_ROUTE);
31 link_cache = nl_cli_link_alloc_cache(sock);
32
33 ifindex = nl_cli_parse_u32(argv[1]);
34
35 if (!rtnl_link_i2name(link_cache, ifindex, name, sizeof(name)))
36 nl_cli_fatal(ENOENT, "Interface index %d does not exist",
37 ifindex);
38
39 printf("%s\n", name);
40
41 return 0;
42}
nl_cli_fatal
void nl_cli_fatal(int err, const char *fmt,...)
Print error message and quit application.
Definition utils.c:71
nl_cli_parse_u32
uint32_t nl_cli_parse_u32(const char *arg)
Parse a text based 32 bit unsigned integer argument.
Definition utils.c:36
rtnl_link_i2name
char * rtnl_link_i2name(struct nl_cache *cache, int ifindex, char *dst, size_t len)
Translate interface index to corresponding link name.
Definition link.c:1483