1 /* $NetBSD: netscope.c,v 1.4 2014/12/10 04:37:59 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