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
isc_netscope_pton(int af,char * scopename,void * addr,isc_uint32_t * zoneid)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 }
77