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nl-link-name2ifindex.c

/*
 * src/nl-link-name2ifindex.c     Transform a interface name to its index
 *
 *          This program is free software; you can redistribute it and/or
 *          modify it under the terms of the GNU General Public License
 *          as published by the Free Software Foundation; either version
 *          2 of the License, or (at your option) any later version.
 *
 * Copyright (c) 2003-2005 Thomas Graf <tgraf@suug.ch>
 */

#include "utils.h"

int main(int argc, char *argv[])
{
      struct nl_handle *nlh;
      struct nl_cache *link_cache;
      int err = -1, ifindex;

      if (nltool_init(argc, argv) < 0)
            return -1;

      if (argc < 2 || !strcmp(argv[1], "-h")) {
            printf("Usage: nl-link-name2ifindex <name>\n");
            return -1;
      }

      nlh = nl_handle_alloc_nondefault(nltool_cbset);
      if (!nlh)
            return -1;

      if (nltool_connect(nlh, NETLINK_ROUTE) < 0)
            goto errout;

      link_cache = nltool_alloc_link_cache(nlh);
      if (!link_cache)
            goto errout;

      if ((ifindex = rtnl_link_name2i(link_cache, argv[1])) == RTNL_LINK_NOT_FOUND)
            fprintf(stderr, "Interface %s does not exist\n", argv[1]);
      else
            printf("%d\n", ifindex);

      nl_cache_destroy_and_free(link_cache);
      err = 0;
errout:
      nl_close(nlh);
      nl_handle_destroy(nlh);

      return err;
}

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