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 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