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 print_usage(void)18static void print_usage(void) 19 { 20 printf("Usage: nl-link-ifindex2name <ifindex>\n"); 21 exit(0); 22 } 23 main(int argc,char * argv[])24int 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 } 48