92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* $NetBSD: if_indextoname.c,v 1.3 2000/07/06 02:54:55 christos Exp $ */
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/* $KAME: if_indextoname.c,v 1.4 2000/04/24 10:08:41 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_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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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: if_indextoname.c,v 1.3 2000/07/06 02:54:55 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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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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#ifdef __weak_alias
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__weak_alias(if_indextoname,_if_indextoname)
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#endif
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/*
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* From RFC 2133:
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*
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* 4.2. Index-to-Name
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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 IFNAMSIZ bytes
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* into which the interface name corresponding to the specified index is
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* returned. (IFNAMSIZ is also defined in <net/if.h> and its value
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* includes a terminating null byte at the end of the interface name.)
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* This pointer is also the return value of the function. If there is
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* no interface corresponding to the specified index, NULL is returned.
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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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if (getifaddrs(&ifaddrs) < 0)
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return(NULL);
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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 == ((struct sockaddr_dl*)
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(void *)ifa->ifa_addr)->sdl_index)
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break;
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}
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if (ifa == NULL)
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ifname = NULL;
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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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return(ifname);
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}
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