workbench/network/stacks/AROSTCP/bsdsocket/api/if_indextoname.c

   1 /*      $KAME: if_indextoname.c,v 1.0 2005/11/14 16:44:30 sonic Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1997, 2000
   5  *      Berkeley Software Design, Inc.  All rights reserved.
   6  * Copyright (c) 2005
   7  *      Pavel Fedin
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  *      BSDI Id: if_indextoname.c,v 2.3 2000/04/17 22:38:05 dab Exp
  28  */
  29
  30 //#include <emul/emulregs.h>
  31 #include <exec/libraries.h>
  32
  33 #include <conf.h>
  34 #include <sys/cdefs.h>
  35 #include <sys/param.h>
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38 #include <net/route.h>
  39 #include <net/if_dl.h>
  40 #include <net/if.h>
  41 #include <api/amiga_api.h>
  42 #include <api/ifaddrs.h>
  43 #include <string.h>
  44 #include <errno.h>
  45
  46 #include "miami_api.h"
  47
  48 /*
  49  * From RFC 2533:
  50  *
  51  * The second function maps an interface index into its corresponding
  52  * name.
  53  *
  54  *    #include <net/if.h>
  55  *
  56  *    char  *if_indextoname(unsigned int ifindex, char *ifname);
  57  *
  58  * The ifname argument must point to a buffer of at least IF_NAMESIZE
  59  * bytes into which the interface name corresponding to the specified
  60  * index is returned.  (IF_NAMESIZE is also defined in <net/if.h> and
  61  * its value includes a terminating null byte at the end of the
  62  * interface name.) This pointer is also the return value of the
  63  * function.  If there is no interface corresponding to the specified
  64  * index, NULL is returned, and errno is set to ENXIO, if there was a
  65  * system error (such as running out of memory), if_indextoname returns
  66  * NULL and errno would be set to the proper value (e.g., ENOMEM).
  67  */
  68
  69 AROS_LH2(char *, if_indextoname,
  70          AROS_LHA(LONG, ifindex, D0),
  71          AROS_LHA(char *, ifname, A0),
  72          struct MiamiBase *, MiamiBase, 47, Miami
  73 )
  74 {
  75         AROS_LIBFUNC_INIT
  76
  77         struct ifaddrs *ifaddrs, *ifa;
  78         int error = 0;
  79
  80         if (getifaddrs(&ifaddrs, MiamiBase->_SocketBase) < 0)
  81                 return(NULL);   /* getifaddrs properly set errno */
  82
  83         for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
  84                 if (ifa->ifa_addr &&
  85                     ifa->ifa_addr->sa_family == AF_LINK &&
  86                     ifindex == ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index)
  87                         break;
  88         }
  89
  90         if (ifa == NULL) {
  91                 error = ENXIO;
  92                 ifname = NULL;
  93         }
  94         else
  95                 strncpy(ifname, ifa->ifa_name, IFNAMSIZ);
  96
  97         freeifaddrs(ifaddrs);
  98
  99         writeErrnoValue(MiamiBase->_SocketBase, error);
 100         return(ifname);
 101
 102         AROS_LIBFUNC_EXIT
 103 }
 104