external/bsd/ntp/dist/lib/isc/netscope.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2002  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /*! \file */
  21
  22 #if defined(LIBC_SCCS) && !defined(lint)
  23 static char rcsid[] =
  24         "Id: netscope.c,v 1.13 2007/06/19 23:47:17 tbox Exp";
  25 #endif /* LIBC_SCCS and not lint */
  26
  27 #include <config.h>
  28
  29 #include <isc/string.h>
  30 #include <isc/net.h>
  31 #include <isc/netscope.h>
  32 #include <isc/result.h>
  33
  34 isc_result_t
  35 isc_netscope_pton(int af, char *scopename, void *addr, isc_uint32_t *zoneid) {
  36         char *ep;
  37 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
  38         unsigned int ifid;
  39 #endif
  40         struct in6_addr *in6;
  41         isc_uint32_t zone;
  42         isc_uint64_t llz;
  43
  44         /* at this moment, we only support AF_INET6 */
  45         if (af != AF_INET6)
  46                 return (ISC_R_FAILURE);
  47
  48         in6 = (struct in6_addr *)addr;
  49
  50         /*
  51          * Basically, "names" are more stable than numeric IDs in terms of
  52          * renumbering, and are more preferred.  However, since there is no
  53          * standard naming convention and APIs to deal with the names.  Thus,
  54          * we only handle the case of link-local addresses, for which we use
  55          * interface names as link names, assuming one to one mapping between
  56          * interfaces and links.
  57          */
  58 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
  59         if (IN6_IS_ADDR_LINKLOCAL(in6) &&
  60             (ifid = if_nametoindex((const char *)scopename)) != 0)
  61                 zone = (isc_uint32_t)ifid;
  62         else {
  63 #endif
  64                 llz = isc_string_touint64(scopename, &ep, 10);
  65                 if (ep == scopename)
  66                         return (ISC_R_FAILURE);
  67
  68                 /* check overflow */
  69                 zone = (isc_uint32_t)(llz & 0xffffffffUL);
  70                 if (zone != llz)
  71                         return (ISC_R_FAILURE);
  72 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
  73         }
  74 #endif
  75
  76         *zoneid = zone;
  77         return (ISC_R_SUCCESS);
  78 }