rdata/generic/opt_41.c

	opt_41.c revision 6e49e91bd08778d7eae45a2229dcf41ed97cc636
/*
 * Copyright (C) 1998, 1999, 2000  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/* $Id: opt_41.c,v 1.9 2000/04/27 00:02:35 tale Exp $ */

/* Reviewed: Thu Mar 16 14:06:44 PST 2000 by gson */

/* RFC 2671 */

#ifndef RDATA_GENERIC_OPT_41_C
#define RDATA_GENERIC_OPT_41_C

#define RRTYPE_OPT_ATTRIBUTES (DNS_RDATATYPEATTR_SINGLETON | DNS_RDATATYPEATTR_META | DNS_RDATATYPEATTR_NOTQUESTION)

static inline isc_result_t
fromtext_opt(dns_rdataclass_t rdclass, dns_rdatatype_t type,
         isc_lex_t *lexer, dns_name_t *origin,
         isc_boolean_t downcase, isc_buffer_t *target)
{
    /*
     * OPT records do not have a text format.
     */

    REQUIRE(type == 41);

    UNUSED(rdclass);
    UNUSED(lexer);
    UNUSED(origin);
    UNUSED(downcase);
    UNUSED(target);

    return (ISC_R_NOTIMPLEMENTED);
}

static inline isc_result_t
totext_opt(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
       isc_buffer_t *target)
{
    /*
     * OPT records do not have a text format.
     */

    REQUIRE(rdata->type == 41);

    UNUSED(tctx);
    UNUSED(target);

    return (ISC_R_NOTIMPLEMENTED);
}

static inline isc_result_t
fromwire_opt(dns_rdataclass_t rdclass, dns_rdatatype_t type,
         isc_buffer_t *source, dns_decompress_t *dctx,
         isc_boolean_t downcase, isc_buffer_t *target)
{
    isc_region_t sregion;
    isc_region_t tregion;
    isc_uint16_t option, length;
    unsigned int total;

    REQUIRE(type == 41);

    UNUSED(rdclass);
    UNUSED(dctx);
    UNUSED(downcase);

    isc_buffer_activeregion(source, &sregion);
    total = 0;
    while (sregion.length != 0) {
        if (sregion.length < 4)
            return (ISC_R_UNEXPECTEDEND);
        option = uint16_fromregion(&sregion);
        isc_region_consume(&sregion, 2);
        length = uint16_fromregion(&sregion);
        isc_region_consume(&sregion, 2);
        total += 4;
        if (sregion.length < length)
            return (ISC_R_UNEXPECTEDEND);
        isc_region_consume(&sregion, length);
        total += length;
    }

    isc_buffer_activeregion(source, &sregion);
    isc_buffer_availableregion(target, &tregion);
    if (tregion.length < total)
        return (ISC_R_NOSPACE);
    memcpy(tregion.base, sregion.base, total);
    isc_buffer_forward(source, total);
    isc_buffer_add(target, total);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_opt(dns_rdata_t *rdata, dns_compress_t *cctx, isc_buffer_t *target) {

    REQUIRE(rdata->type == 41);

    UNUSED(cctx);

    return (mem_tobuffer(target, rdata->data, rdata->length));
}

static inline int
compare_opt(dns_rdata_t *rdata1, dns_rdata_t *rdata2) {
    isc_region_t r1;
    isc_region_t r2;

    REQUIRE(rdata1->type == rdata2->type);
    REQUIRE(rdata1->rdclass == rdata2->rdclass);
    REQUIRE(rdata1->type == 41);

    dns_rdata_toregion(rdata1, &r1);
    dns_rdata_toregion(rdata2, &r2);
    return (compare_region(&r1, &r2));
}

static inline isc_result_t
fromstruct_opt(dns_rdataclass_t rdclass, dns_rdatatype_t type, void *source,
           isc_buffer_t *target)
{
    REQUIRE(type == 41);

    UNUSED(rdclass);
    UNUSED(source);
    UNUSED(target);

    return (ISC_R_NOTIMPLEMENTED);
}

static inline isc_result_t
tostruct_opt(dns_rdata_t *rdata, void *target, isc_mem_t *mctx) {

    REQUIRE(rdata->type == 41);

    UNUSED(target);
    UNUSED(mctx);

    return (ISC_R_NOTIMPLEMENTED);
}

static inline void
freestruct_opt(void *source) {
    UNUSED(source);
}

static inline isc_result_t
additionaldata_opt(dns_rdata_t *rdata, dns_additionaldatafunc_t add,
           void *arg)
{
    REQUIRE(rdata->type == 41);

    UNUSED(add);
    UNUSED(arg);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_opt(dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg) {

    /*
     * OPT records are not digested.
     */

    REQUIRE(rdata->type == 41);

    UNUSED(digest);
    UNUSED(arg);

    return (ISC_R_NOTIMPLEMENTED);
}

#endif  /* RDATA_GENERIC_OPT_41_C */