libnl 3.5.0

nl-link-ifindex2name.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3 * src/nl-link-ifindex2name.c Transform a interface index to its name
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation version 2.1
8 * of the License.
9 *
10 * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
11 */
12
13 #include <netlink/cli/utils.h>
14 #include <netlink/cli/link.h>
15
16 #include <linux/netlink.h>
17
18 static void print_usage(void)
19 {
20 printf("Usage: nl-link-ifindex2name <ifindex>\n");
21 exit(0);
22 }
23
24 int main(int argc, char *argv[])
25 {
26 struct nl_sock *sock;
27 struct nl_cache *link_cache;
28 char name[IFNAMSIZ];
29 uint32_t ifindex;
30
31 if (argc < 2)
32 print_usage();
33
34 sock = nl_cli_alloc_socket();
35 nl_cli_connect(sock, NETLINK_ROUTE);
36 link_cache = nl_cli_link_alloc_cache(sock);
37
38 ifindex = nl_cli_parse_u32(argv[1]);
39
40 if (!rtnl_link_i2name(link_cache, ifindex, name, sizeof(name)))
41 nl_cli_fatal(ENOENT, "Interface index %d does not exist",
42 ifindex);
43
44 printf("%s\n", name);
45
46 return 0;
47 }
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:43
nl_cli_fatal
void nl_cli_fatal(int err, const char *fmt,...)
Print error message and quit application.
Definition: utils.c:78
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:1484