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      1 /*	$NetBSD: netscope.c,v 1.2 2024/08/18 20:47:14 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
      5  * Copyright (C) 2002  Internet Software Consortium.
      6  *
      7  * Permission to use, copy, modify, and/or distribute this software for any
      8  * purpose with or without fee is hereby granted, provided that the above
      9  * copyright notice and this permission notice appear in all copies.
     10  *
     11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
     12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
     13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
     14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
     15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
     16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
     17  * PERFORMANCE OF THIS SOFTWARE.
     18  */
     19 
     20 /*! \file */
     21 
     22 #if defined(LIBC_SCCS) && !defined(lint)
     23 static char rcsid[] =
     24 	"Id: netscope.c,v 1.13 2007/06/19 23:47:17 tbox Exp ";
     25 #endif /* LIBC_SCCS and not lint */
     26 
     27 #include <config.h>
     28 
     29 #include <isc/string.h>
     30 #include <isc/net.h>
     31 #include <isc/netscope.h>
     32 #include <isc/result.h>
     33 
     34 isc_result_t
     35 isc_netscope_pton(int af, char *scopename, void *addr, isc_uint32_t *zoneid) {
     36 	char *ep;
     37 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
     38 	unsigned int ifid;
     39 #endif
     40 	struct in6_addr *in6;
     41 	isc_uint32_t zone;
     42 	isc_uint64_t llz;
     43 
     44 	/* at this moment, we only support AF_INET6 */
     45 	if (af != AF_INET6)
     46 		return (ISC_R_FAILURE);
     47 
     48 	in6 = (struct in6_addr *)addr;
     49 
     50 	/*
     51 	 * Basically, "names" are more stable than numeric IDs in terms of
     52 	 * renumbering, and are more preferred.  However, since there is no
     53 	 * standard naming convention and APIs to deal with the names.  Thus,
     54 	 * we only handle the case of link-local addresses, for which we use
     55 	 * interface names as link names, assuming one to one mapping between
     56 	 * interfaces and links.
     57 	 */
     58 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
     59 	if (IN6_IS_ADDR_LINKLOCAL(in6) &&
     60 	    (ifid = if_nametoindex((const char *)scopename)) != 0)
     61 		zone = (isc_uint32_t)ifid;
     62 	else {
     63 #endif
     64 		llz = isc_string_touint64(scopename, &ep, 10);
     65 		if (ep == scopename)
     66 			return (ISC_R_FAILURE);
     67 
     68 		/* check overflow */
     69 		zone = (isc_uint32_t)(llz & 0xffffffffUL);
     70 		if (zone != llz)
     71 			return (ISC_R_FAILURE);
     72 #ifdef ISC_PLATFORM_HAVEIFNAMETOINDEX
     73 	}
     74 #endif
     75 
     76 	*zoneid = zone;
     77 	return (ISC_R_SUCCESS);
     78 }
     79