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