GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/net/if_indextoname.c Lines: 0 10 0.0 %
Date: 2017-11-13 Branches: 0 6 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: if_indextoname.c,v 1.11 2015/10/23 13:09:19 claudio Exp $	*/
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/*	$KAME: if_indextoname.c,v 1.6 2000/11/07 22:33:25 jinmei Exp $	*/
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/*-
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 * Copyright (c) 2015 Claudio Jeker <claudio@openbsd.org>
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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/types.h>
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#include <sys/socket.h>
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#include <net/if.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 2533:
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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 if_nameindex *ifni, *ifni2;
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	if ((ifni = if_nameindex()) == NULL)
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		return NULL;
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	for (ifni2 = ifni; ifni2->if_index != 0; ifni2++) {
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		if (ifni2->if_index == ifindex) {
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			strlcpy(ifname, ifni2->if_name, IFNAMSIZ);
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			if_freenameindex(ifni);
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			return ifname;
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		}
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	}
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	if_freenameindex(ifni);
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	errno = ENXIO;
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	return NULL;
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}
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DEF_WEAK(if_indextoname);