contrib/ntp/libisc/netscope.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2002  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and 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 #if defined(LIBC_SCCS) && !defined(lint)
  19 static char rcsid[] =
  20         "$Id: netscope.c,v 1.5.142.7 2004/03/12 10:31:26 marka Exp $";
  21 #endif /* LIBC_SCCS and not lint */
  22
  23 #include <config.h>
  24
  25 #include <isc/string.h>
  26 #include <isc/net.h>
  27 #include <isc/netscope.h>
  28 #include <isc/result.h>
  29
  30 isc_result_t
  31 isc_netscope_pton(int af, char *scopename, void *addr, isc_uint32_t *zoneid) {
  32         char *ep;
  33 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
  34         unsigned int ifid;
  35 #endif
  36         struct in6_addr *in6;
  37         isc_uint32_t zone;
  38         isc_uint64_t llz;
  39
  40         /* at this moment, we only support AF_INET6 */
  41         if (af != AF_INET6)
  42                 return (ISC_R_FAILURE);
  43
  44         in6 = (struct in6_addr *)addr;
  45
  46         /*
  47          * Basically, "names" are more stable than numeric IDs in terms of
  48          * renumbering, and are more preferred.  However, since there is no
  49          * standard naming convention and APIs to deal with the names.  Thus,
  50          * we only handle the case of link-local addresses, for which we use
  51          * interface names as link names, assuming one to one mapping between
  52          * interfaces and links.
  53          */
  54 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
  55         if (IN6_IS_ADDR_LINKLOCAL(in6) &&
  56             (ifid = if_nametoindex((const char *)scopename)) != 0)
  57                 zone = (isc_uint32_t)ifid;
  58         else {
  59 #endif
  60                 llz = isc_string_touint64(scopename, &ep, 10);
  61                 if (ep == scopename)
  62                         return (ISC_R_FAILURE);
  63
  64                 /* check overflow */
  65                 zone = (isc_uint32_t)(llz & 0xffffffffUL);
  66                 if (zone != llz)
  67                         return (ISC_R_FAILURE);
  68 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
  69         }
  70 #endif
  71
  72         *zoneid = zone;
  73         return (ISC_R_SUCCESS);
  74 }