/* $NetBSD: netscope.c,v 1.3.4.1 2024/02/29 12:35:02 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /*! \file */ #include #include #include #include #include #include #include isc_result_t isc_netscope_pton(int af, char *scopename, void *addr, uint32_t *zoneid) { char *ep; #ifdef HAVE_IF_NAMETOINDEX unsigned int ifid; struct in6_addr *in6; #endif /* ifdef HAVE_IF_NAMETOINDEX */ uint32_t zone = 0; uint64_t llz; #ifndef HAVE_IF_NAMETOINDEX UNUSED(addr); #endif /* at this moment, we only support AF_INET6 */ if (af != AF_INET6) { return (ISC_R_FAILURE); } /* * Basically, "names" are more stable than numeric IDs in terms * of renumbering, and are more preferred. However, since there * is no standard naming convention and APIs to deal with the * names. Thus, we only handle the case of link-local * addresses, for which we use interface names as link names, * assuming one to one mapping between interfaces and links. */ #ifdef HAVE_IF_NAMETOINDEX in6 = (struct in6_addr *)addr; if (IN6_IS_ADDR_LINKLOCAL(in6) && (ifid = if_nametoindex((const char *)scopename)) != 0) { zone = (uint32_t)ifid; } else { #endif /* ifdef HAVE_IF_NAMETOINDEX */ llz = strtoull(scopename, &ep, 10); if (ep == scopename) { return (ISC_R_FAILURE); } /* check overflow */ zone = (uint32_t)(llz & 0xffffffffUL); if (zone != llz) { return (ISC_R_FAILURE); } #ifdef HAVE_IF_NAMETOINDEX } #endif /* ifdef HAVE_IF_NAMETOINDEX */ *zoneid = zone; return (ISC_R_SUCCESS); }