libnl: /data/src/libnl3/src/nl-link-name2ifindex.c Source File

libnl 3.7.0

nl-link-name2ifindex.c
1 /* SPDX-License-Identifier: LGPL-2.1-only */
2 /*
3 * Copyright (c) 2003-2008 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-name2ifindex <name>\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 uint32_t ifindex;
22
23 if (argc < 2)
24 print_usage();
25
26 sock = nl_cli_alloc_socket();
27 nl_cli_connect(sock, NETLINK_ROUTE);
28 link_cache = nl_cli_link_alloc_cache(sock);
29
30 if (!(ifindex = rtnl_link_name2i(link_cache, argv[1])))
31 nl_cli_fatal(ENOENT, "Interface \"%s\" does not exist",
32 argv[1]);
33
34 printf("%u\n", ifindex);
35
36 return 0;
37 }
nl_cli_fatal
void nl_cli_fatal(int err, const char *fmt,...)
Print error message and quit application.
Definition: utils.c:71
rtnl_link_name2i
int rtnl_link_name2i(struct nl_cache *cache, const char *name)
Translate link name to corresponding interface index.
Definition: link.c:1496