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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) 2003-2006 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 = nltool_alloc_handle();
      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_free(link_cache);
      err = 0;
errout:
      nl_close(nlh);
      nl_handle_destroy(nlh);

      return err;
}

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