/* $OpenBSD: if_nametoindex.c,v 1.10 2015/10/23 13:09:19 claudio Exp $ */ /* $KAME: if_nametoindex.c,v 1.5 2000/11/24 08:04:40 itojun Exp $ */ /*- * Copyright (c) 2015 Claudio Jeker * Copyright (c) 1997, 2000 * Berkeley Software Design, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * BSDI Id: if_nametoindex.c,v 2.3 2000/04/17 22:38:05 dab Exp */ #include #include #include #include #include #include /* * From RFC 2553: * * 4.1 Name-to-Index * * * The first function maps an interface name into its corresponding * index. * * #include * * unsigned int if_nametoindex(const char *ifname); * * If the specified interface name does not exist, the return value is * 0, and errno is set to ENXIO. If there was a system error (such as * running out of memory), the return value is 0 and errno is set to the * proper value (e.g., ENOMEM). */ unsigned int if_nametoindex(const char *ifname) { struct if_nameindex *ifni, *ifni2; unsigned int index; if ((ifni = if_nameindex()) == NULL) return(0); for (ifni2 = ifni; ifni2->if_index != 0; ifni2++) { if (strcmp(ifni2->if_name, ifname) == 0) { index = ifni2->if_index; if_freenameindex(ifni); return index; } } if_freenameindex(ifni); errno = ENXIO; return 0; } DEF_WEAK(if_nametoindex);