9b10f59a10
Introduce the recently approved BSD-1-Clause and replace 0BSD which never did fit well our use cases.
91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/* $KAME: if_indextoname.c,v 1.7 2000/11/08 03:09:30 itojun Exp $ */
|
|
|
|
/*-
|
|
* SPDX-License-Identifier: BSD-1-Clause
|
|
*
|
|
* Copyright (c) 1997, 2000
|
|
* Berkeley Software Design, Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* BSDI Id: if_indextoname.c,v 2.3 2000/04/17 22:38:05 dab Exp
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <net/if_dl.h>
|
|
#include <net/if.h>
|
|
#include <ifaddrs.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
/*
|
|
* From RFC 2533:
|
|
*
|
|
* The second function maps an interface index into its corresponding
|
|
* name.
|
|
*
|
|
* #include <net/if.h>
|
|
*
|
|
* char *if_indextoname(unsigned int ifindex, char *ifname);
|
|
*
|
|
* The ifname argument must point to a buffer of at least IF_NAMESIZE
|
|
* bytes into which the interface name corresponding to the specified
|
|
* index is returned. (IF_NAMESIZE is also defined in <net/if.h> and
|
|
* its value includes a terminating null byte at the end of the
|
|
* interface name.) This pointer is also the return value of the
|
|
* function. If there is no interface corresponding to the specified
|
|
* index, NULL is returned, and errno is set to ENXIO, if there was a
|
|
* system error (such as running out of memory), if_indextoname returns
|
|
* NULL and errno would be set to the proper value (e.g., ENOMEM).
|
|
*/
|
|
|
|
char *
|
|
if_indextoname(unsigned int ifindex, char *ifname)
|
|
{
|
|
struct ifaddrs *ifaddrs, *ifa;
|
|
int error = 0;
|
|
|
|
if (getifaddrs(&ifaddrs) < 0)
|
|
return(NULL); /* getifaddrs properly set errno */
|
|
|
|
for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
|
|
if (ifa->ifa_addr &&
|
|
ifa->ifa_addr->sa_family == AF_LINK &&
|
|
ifindex == LLINDEX((struct sockaddr_dl*)ifa->ifa_addr))
|
|
break;
|
|
}
|
|
|
|
if (ifa == NULL) {
|
|
error = ENXIO;
|
|
ifname = NULL;
|
|
}
|
|
else
|
|
strncpy(ifname, ifa->ifa_name, IFNAMSIZ);
|
|
|
|
freeifaddrs(ifaddrs);
|
|
|
|
errno = error;
|
|
return(ifname);
|
|
}
|