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Annotation of embedaddon/ntp/lib/isc/netscope.c, revision 1.1

1.1     ! misho       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: }