netscope.c revision 6526fd032fc418411da3af4201214e95c113d3e2
/*
* Copyright (C) 1996-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] =
"$Id: netscope.c,v 1.2 2002/10/24 03:52:33 marka Exp $";
#endif /* LIBC_SCCS and not lint */
#include <isc/string.h>
#include <isc/net.h>
#include <isc/netscope.h>
#include <isc/result.h>
isc_result_t
isc_netscope_pton(int af, char *scopename, char *addr, u_int32_t *zoneid) {
char *ep;
unsigned int ifid;
struct in6_addr *in6;
u_int32_t zone;
isc_uint64_t llz;
/* at this moment, we only support AF_INET6 */
if (af != AF_INET6)
return (ISC_R_FAILURE);
in6 = (struct in6_addr *)addr;
/*
* Basically, "names" are more stable than numeric IDs in terms of
* renumbering, and are more preferred. However, since there is no
* standard naming convention and APIs to deal with the names. Thus,
* we only handle the case of link-local addresses, for which we use
* interface names as link names, assuming one to one mapping between
* interfaces and links.
*/
if (IN6_IS_ADDR_LINKLOCAL(in6) &&
(ifid = if_nametoindex((const char *)scopename)) != 0)
zone = (u_int32_t)ifid;
else {
llz = isc_string_touint64(scopename, &ep, 10);
if (ep == scopename)
return (ISC_R_FAILURE);
/* check overflow */
zone = (u_int32_t)(llz & 0xffffffffUL);
if (zone != llz)
return (ISC_R_FAILURE);
}
*zoneid = zone;
return (ISC_R_SUCCESS);
}