contrib/bind-9.5.2/lib/isc/netscope.c

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