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nl-link-name2ifindex.c

/*
 * src/nl-link-name2ifindex.c     Transform a interface name to its index
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation version 2.1
 *    of the License.
 *
 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
 */

#include <netlink/cli/utils.h>
#include <netlink/cli/link.h>

static void print_usage(void)
{
      printf("Usage: nl-link-ifindex2name <ifindex>\n");
      exit(0);
}

int main(int argc, char *argv[])
{
      struct nl_sock *sock;
      struct nl_cache *link_cache;
      uint32_t ifindex;

      if (argc < 2)
            print_usage();

      sock = nl_cli_alloc_socket();
      nl_cli_connect(sock, NETLINK_ROUTE);
      link_cache = nl_cli_link_alloc_cache(sock);

      if (!(ifindex = rtnl_link_name2i(link_cache, argv[1])))
            nl_cli_fatal(ENOENT, "Interface \"%s\" does not exist",
                       argv[1]);

      printf("%u\n", ifindex);

      return 0;
}

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