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84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/* $KAME: if_nametoindex.c,v 1.6 2000/11/24 08:18:54 itojun Exp $ */
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/*-
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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/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <net/if_dl.h>
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#include <ifaddrs.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 ifaddrs *ifaddrs, *ifa;
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unsigned int ni;
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if (getifaddrs(&ifaddrs) < 0)
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return(0);
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ni = 0;
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for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
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if (ifa->ifa_addr &&
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ifa->ifa_addr->sa_family == AF_LINK &&
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strcmp(ifa->ifa_name, ifname) == 0) {
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ni = ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index;
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break;
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}
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}
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freeifaddrs(ifaddrs);
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if (!ni)
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errno = ENXIO;
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return(ni);
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}
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