source: rtems/cpukit/libnetworking/libc/if_indextoname.c @ d8fce03

4.8
Last change on this file since d8fce03 was d8fce03, checked in by cvs2git <rtems-devel@…>, on Jul 13, 2009 at 2:20:37 PM

This commit was manufactured by cvs2svn to create branch 'rtems-4-8-branch'.

Cherrypick from master 2009-07-13 14:20:36 UTC Ralf Corsepius <ralf.corsepius@…> 'Add autoconf-sources.add.':

contrib/crossrpms/autotools/autoconf-sources.add
contrib/crossrpms/autotools/automake-sources.add
contrib/crossrpms/patches/binutils-2.17.50-cygwin-20060817-1.diff
contrib/crossrpms/patches/gdb-6.5-bfinrtems-20071114.diff
contrib/crossrpms/patches/gdb-6.5-bfinrtems-20090122.diff
cpukit/libnetworking/ifaddrs.h
cpukit/libnetworking/libc/getifaddrs.c
cpukit/libnetworking/libc/if_indextoname.c
cpukit/libnetworking/libc/if_nameindex.c

  • Property mode set to 100644
File size: 2.8 KB
RevLine 
[d8fce03]1/*      $KAME: if_indextoname.c,v 1.7 2000/11/08 03:09:30 itojun Exp $  */
2
3/*-
4 * Copyright (c) 1997, 2000
5 *      Berkeley Software Design, Inc.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 *      BSDI Id: if_indextoname.c,v 2.3 2000/04/17 22:38:05 dab Exp
26 */
27
28#include <rtems/bsd/sys/cdefs.h>
29
30#include <sys/types.h>
31#include <sys/socket.h>
32#include <net/if_dl.h>
33#include <net/if.h>
34#include <ifaddrs.h>
35#include <stdlib.h>
36#include <string.h>
37#include <errno.h>
38
39/*
40 * From RFC 2533:
41 *
42 * The second function maps an interface index into its corresponding
43 * name.
44 *
45 *    #include <net/if.h>
46 *
47 *    char  *if_indextoname(unsigned int ifindex, char *ifname);
48 *
49 * The ifname argument must point to a buffer of at least IF_NAMESIZE
50 * bytes into which the interface name corresponding to the specified
51 * index is returned.  (IF_NAMESIZE is also defined in <net/if.h> and
52 * its value includes a terminating null byte at the end of the
53 * interface name.) This pointer is also the return value of the
54 * function.  If there is no interface corresponding to the specified
55 * index, NULL is returned, and errno is set to ENXIO, if there was a
56 * system error (such as running out of memory), if_indextoname returns
57 * NULL and errno would be set to the proper value (e.g., ENOMEM).
58 */
59
60char *
61if_indextoname(unsigned int ifindex, char *ifname)
62{
63        struct ifaddrs *ifaddrs, *ifa;
64        int error = 0;
65
66        if (getifaddrs(&ifaddrs) < 0)
67                return(NULL);   /* getifaddrs properly set errno */
68
69        for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
70                if (ifa->ifa_addr &&
71                    ifa->ifa_addr->sa_family == AF_LINK &&
72                    ifindex == ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index)
73                        break;
74        }
75
76        if (ifa == NULL) {
77                error = ENXIO;
78                ifname = NULL;
79        }
80        else
81                strncpy(ifname, ifa->ifa_name, IFNAMSIZ);
82
83        freeifaddrs(ifaddrs);
84
85        errno = error;
86        return(ifname);
87}
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