1 /* 2 * src/nl-link-name2ifindex.c Transform a interface name to its index 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation version 2.1 7 * of the License. 8 * 9 * Copyright (c) 2003-2008 Thomas Graf <tgraf (at) suug.ch> 10 */ 11 12 #include <netlink/cli/utils.h> 13 #include <netlink/cli/link.h> 14 15 static void print_usage(void) 16 { 17 printf("Usage: nl-link-ifindex2name <ifindex>\n"); 18 exit(0); 19 } 20 21 int main(int argc, char *argv[]) 22 { 23 struct nl_sock *sock; 24 struct nl_cache *link_cache; 25 uint32_t ifindex; 26 27 if (argc < 2) 28 print_usage(); 29 30 sock = nl_cli_alloc_socket(); 31 nl_cli_connect(sock, NETLINK_ROUTE); 32 link_cache = nl_cli_link_alloc_cache(sock); 33 34 if (!(ifindex = rtnl_link_name2i(link_cache, argv[1]))) 35 nl_cli_fatal(ENOENT, "Interface \"%s\" does not exist", 36 argv[1]); 37 38 printf("%u\n", ifindex); 39 40 return 0; 41 } 42
