fa556e83be
RFC 2533 refers to 'A Syntax for Describing Media Feature Sets', which is wrong since the correct reference should be RFC 2553 'Basic Socket Interface Extensions for IPv6'. Obtained from: OpenBSD MFC after: 1 week
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/* $KAME: if_indextoname.c,v 1.7 2000/11/08 03:09:30 itojun Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-1-Clause
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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_indextoname.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_dl.h>
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#include <net/if.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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* The second function maps an interface index into its corresponding
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* name.
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*
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* #include <net/if.h>
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*
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* char *if_indextoname(unsigned int ifindex, char *ifname);
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*
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* The ifname argument must point to a buffer of at least IF_NAMESIZE
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* bytes into which the interface name corresponding to the specified
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* index is returned. (IF_NAMESIZE is also defined in <net/if.h> and
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* its value includes a terminating null byte at the end of the
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* interface name.) This pointer is also the return value of the
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* function. If there is no interface corresponding to the specified
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* index, NULL is returned, and errno is set to ENXIO, if there was a
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* system error (such as running out of memory), if_indextoname returns
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* NULL and errno would be set to the proper value (e.g., ENOMEM).
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*/
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char *
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if_indextoname(unsigned int ifindex, char *ifname)
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{
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struct ifaddrs *ifaddrs, *ifa;
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int error = 0;
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if (ifindex == 0) {
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errno = ENXIO;
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return(NULL);
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}
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if (getifaddrs(&ifaddrs) < 0)
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return(NULL); /* getifaddrs properly set errno */
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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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ifindex == LLINDEX((struct sockaddr_dl*)ifa->ifa_addr))
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break;
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}
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if (ifa == NULL) {
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error = ENXIO;
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ifname = NULL;
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}
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else
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strncpy(ifname, ifa->ifa_name, IFNAMSIZ);
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freeifaddrs(ifaddrs);
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errno = error;
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return(ifname);
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}
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