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

   1 /*      $KAME: if_nametoindex.c,v 1.0 2005/11/14 16:23:54 sonic Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1997, 2000
   5  *      Berkeley Software Design, Inc.  All rights reserved.
   6  * Copyright (c) 2005 - 2006
   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_nametoindex.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/types.h>
  36 #include <sys/socket.h>
  37 #include <sys/sockio.h>
  38 #include <net/route.h>
  39 #include <net/if.h>
  40 #include <net/if_dl.h>
  41 #include <net/if_protos.h>
  42 #include <api/amiga_api.h>
  43 #include <api/ifaddrs.h>
  44 #include <string.h>
  45 #include <errno.h>
  46
  47 #include "miami_api.h"
  48
  49 /*
  50  * From RFC 2553:
  51  *
  52  * 4.1 Name-to-Index
  53  *
  54  *
  55  *    The first function maps an interface name into its corresponding
  56  *    index.
  57  *
  58  *       #include <net/if.h>
  59  *
  60  *       unsigned int  if_nametoindex(const char *ifname);
  61  *
  62  *    If the specified interface name does not exist, the return value is
  63  *    0, and errno is set to ENXIO.  If there was a system error (such as
  64  *    running out of memory), the return value is 0 and errno is set to the
  65  *    proper value (e.g., ENOMEM).
  66  */
  67
  68 unsigned int
  69 __if_nametoindex(char *ifname, struct SocketBase *SocketBase)
  70 {
  71         // int s;
  72         struct ifnet *ifp;
  73         struct ifaddrs *ifaddrs, *ifa;
  74         unsigned int ni;
  75
  76         ifp = ifunit(ifname);
  77         if (ifp)
  78                 return ifp->if_index;
  79
  80         if (getifaddrs(&ifaddrs, SocketBase) < 0)
  81                 return(0);
  82
  83         ni = 0;
  84
  85         for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
  86                 if (ifa->ifa_addr &&
  87                     ifa->ifa_addr->sa_family == AF_LINK &&
  88                     strcmp(ifa->ifa_name, ifname) == 0) {
  89                         ni = ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index;
  90                         break;
  91                 }
  92         }
  93
  94         freeifaddrs(ifaddrs);
  95         if (!ni)
  96                 writeErrnoValue(SocketBase, ENXIO);
  97         return(ni);
  98 }
  99
 100 AROS_LH1(LONG, if_nametoindex,
 101          AROS_LHA(char *, ifname, A0),
 102          struct MiamiBase *, MiamiBase, 46, Miami
 103 )
 104 {
 105         AROS_LIBFUNC_INIT
 106
 107         return __if_nametoindex(ifname, MiamiBase->_SocketBase);
 108
 109         AROS_LIBFUNC_EXIT
 110 }
 111