rdata/generic/opt_41.c

	opt_41.c revision 3d17a3ba61a303d5c4d9867068d0fbe9f24d2988
/*
 * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1998-2002  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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 1.34 2009/12/04 21:09:34 marka Exp $ */

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

/* RFC2671 */

#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(ARGS_FROMTEXT) {
    /*
     * OPT records do not have a text format.
     */

    REQUIRE(type == 41);

    UNUSED(type);
    UNUSED(rdclass);
    UNUSED(lexer);
    UNUSED(origin);
    UNUSED(options);
    UNUSED(target);
    UNUSED(callbacks);

    return (ISC_R_NOTIMPLEMENTED);
}

static inline isc_result_t
totext_opt(ARGS_TOTEXT) {
    isc_region_t r;
    isc_region_t or;
    isc_uint16_t option;
    isc_uint16_t length;
    char buf[sizeof("64000 64000")];

    /*
     * OPT records do not have a text format.
     */

    REQUIRE(rdata->type == 41);

    dns_rdata_toregion(rdata, &r);
    while (r.length > 0) {
        option = uint16_fromregion(&r);
        isc_region_consume(&r, 2);
        length = uint16_fromregion(&r);
        isc_region_consume(&r, 2);
        sprintf(buf, "%u %u", option, length);
        RETERR(str_totext(buf, target));
        INSIST(r.length >= length);
        if (length > 0) {
            if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
                RETERR(str_totext(" (", target));
            RETERR(str_totext(tctx->linebreak, target));
            or = r;
            or.length = length;
            RETERR(isc_base64_totext(&or, tctx->width - 2,
                         tctx->linebreak, target));
            isc_region_consume(&r, length);
            if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
                RETERR(str_totext(" )", target));
        }
        if (r.length > 0)
            RETERR(str_totext(" ", target));
    }

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_opt(ARGS_FROMWIRE) {
    isc_region_t sregion;
    isc_region_t tregion;
    isc_uint16_t length;
    unsigned int total;

    REQUIRE(type == 41);

    UNUSED(type);
    UNUSED(rdclass);
    UNUSED(dctx);
    UNUSED(options);

    isc_buffer_activeregion(source, &sregion);
    total = 0;
    while (sregion.length != 0) {
        if (sregion.length < 4)
            return (ISC_R_UNEXPECTEDEND);
        /*
         * Eat the 16bit option code.  There is nothing to
         * be done with it currently.
         */
        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(ARGS_TOWIRE) {

    REQUIRE(rdata->type == 41);

    UNUSED(cctx);

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

static inline int
compare_opt(ARGS_COMPARE) {
    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 (isc_region_compare(&r1, &r2));
}

static inline isc_result_t
fromstruct_opt(ARGS_FROMSTRUCT) {
    dns_rdata_opt_t *opt = source;
    isc_region_t region;
    isc_uint16_t length;

    REQUIRE(type == 41);
    REQUIRE(source != NULL);
    REQUIRE(opt->common.rdtype == type);
    REQUIRE(opt->common.rdclass == rdclass);
    REQUIRE(opt->options != NULL || opt->length == 0);

    UNUSED(type);
    UNUSED(rdclass);

    region.base = opt->options;
    region.length = opt->length;
    while (region.length >= 4) {
        isc_region_consume(&region, 2); /* opt */
        length = uint16_fromregion(&region);
        isc_region_consume(&region, 2);
        if (region.length < length)
            return (ISC_R_UNEXPECTEDEND);
        isc_region_consume(&region, length);
    }
    if (region.length != 0)
        return (ISC_R_UNEXPECTEDEND);

    return (mem_tobuffer(target, opt->options, opt->length));
}

static inline isc_result_t
tostruct_opt(ARGS_TOSTRUCT) {
    dns_rdata_opt_t *opt = target;
    isc_region_t r;

    REQUIRE(rdata->type == 41);
    REQUIRE(target != NULL);

    opt->common.rdclass = rdata->rdclass;
    opt->common.rdtype = rdata->type;
    ISC_LINK_INIT(&opt->common, link);

    dns_rdata_toregion(rdata, &r);
    opt->length = r.length;
    opt->options = mem_maybedup(mctx, r.base, r.length);
    if (opt->options == NULL)
        return (ISC_R_NOMEMORY);

    opt->offset = 0;
    opt->mctx = mctx;
    return (ISC_R_SUCCESS);
}

static inline void
freestruct_opt(ARGS_FREESTRUCT) {
    dns_rdata_opt_t *opt = source;

    REQUIRE(source != NULL);
    REQUIRE(opt->common.rdtype == 41);

    if (opt->mctx == NULL)
        return;

    if (opt->options != NULL)
        isc_mem_free(opt->mctx, opt->options);
    opt->mctx = NULL;
}

static inline isc_result_t
additionaldata_opt(ARGS_ADDLDATA) {
    REQUIRE(rdata->type == 41);

    UNUSED(rdata);
    UNUSED(add);
    UNUSED(arg);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_opt(ARGS_DIGEST) {

    /*
     * OPT records are not digested.
     */

    REQUIRE(rdata->type == 41);

    UNUSED(rdata);
    UNUSED(digest);
    UNUSED(arg);

    return (ISC_R_NOTIMPLEMENTED);
}

static inline isc_boolean_t
checkowner_opt(ARGS_CHECKOWNER) {

    REQUIRE(type == 41);

    UNUSED(type);
    UNUSED(rdclass);
    UNUSED(wildcard);

    return (dns_name_equal(name, dns_rootname));
}

static inline isc_boolean_t
checknames_opt(ARGS_CHECKNAMES) {

    REQUIRE(rdata->type == 41);

    UNUSED(rdata);
    UNUSED(owner);
    UNUSED(bad);

    return (ISC_TRUE);
}

static inline int
casecompare_opt(ARGS_COMPARE) {
    return (compare_opt(rdata1, rdata2));
}

#endif  /* RDATA_GENERIC_OPT_41_C */