netscope.c revision 181834 
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)
19static 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
30isc_result_t
31isc_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}
75