92db021bdc
backend and are more robust against SIOCGIFCONF alignment issue. now getifaddrs always takes care of the issue. (sync with kame tree) use weak symbol just in case.
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/* $NetBSD: if_indextoname.c,v 1.1 2000/04/24 10:24:47 itojun 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 "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*)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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