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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC 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.
*/
/*! \file */
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] =
"$Id: netscope.c,v 1.6 2020/01/20 18:49:46 florian Exp $";
#endif /* LIBC_SCCS and not lint */
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <isc/net.h>
#include <isc/netscope.h>
#include <isc/result.h>
isc_result_t
isc_netscope_pton(int af, char *scopename, void *addr, uint32_t *zoneid) {
char *ep;
unsigned int ifid;
struct in6_addr *in6;
uint32_t zone;
uint64_t llz;
/* at this moment, we only support AF_INET6 */
if (af != AF_INET6)
return (ISC_R_FAILURE);
/*
* 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.
*/
in6 = (struct in6_addr *)addr;
if (IN6_IS_ADDR_LINKLOCAL(in6) &&
(ifid = if_nametoindex((const char *)scopename)) != 0)
zone = (uint32_t)ifid;
else {
llz = strtoull(scopename, &ep, 10);
if (ep == scopename)
return (ISC_R_FAILURE);
/* check overflow */
zone = (uint32_t)(llz & 0xffffffffUL);
if (zone != llz)
return (ISC_R_FAILURE);
}
*zoneid = zone;
return (ISC_R_SUCCESS);
}
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