ds_43.c

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/*
 * Copyright (C) 2004, 2005, 2007, 2009-2014  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 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.
 */

/* $Id$ */

/* RFC3658 */

#ifndef RDATA_GENERIC_DS_43_C
#define RDATA_GENERIC_DS_43_C

#define RRTYPE_DS_ATTRIBUTES \
        (DNS_RDATATYPEATTR_DNSSEC|DNS_RDATATYPEATTR_ATPARENT)

#include <isc/sha1.h>
#include <isc/sha2.h>

#include <dns/ds.h>

#include "dst_gost.h"

static inline isc_result_t
fromtext_ds(ARGS_FROMTEXT) {
        isc_token_t token;
        unsigned char c;
        int length;

        REQUIRE(type == 43);

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

        /*
         * Key tag.
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
                                      ISC_FALSE));
        if (token.value.as_ulong > 0xffffU)
                RETTOK(ISC_R_RANGE);
        RETERR(uint16_tobuffer(token.value.as_ulong, target));

        /*
         * Algorithm.
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                                      ISC_FALSE));
        RETTOK(dns_secalg_fromtext(&c, &token.value.as_textregion));
        RETERR(mem_tobuffer(target, &c, 1));

        /*
         * Digest type.
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                                      ISC_FALSE));
        RETTOK(dns_dsdigest_fromtext(&c, &token.value.as_textregion));
        RETERR(mem_tobuffer(target, &c, 1));

        /*
         * Digest.
         */
        switch (c) {
        case DNS_DSDIGEST_SHA1:
                length = ISC_SHA1_DIGESTLENGTH;
                break;
        case DNS_DSDIGEST_SHA256:
                length = ISC_SHA256_DIGESTLENGTH;
                break;
#ifdef ISC_GOST_DIGESTLENGTH
        case DNS_DSDIGEST_GOST:
                length = ISC_GOST_DIGESTLENGTH;
                break;
#endif
        case DNS_DSDIGEST_SHA384:
                length = ISC_SHA384_DIGESTLENGTH;
                break;
        default:
                length = -1;
                break;
        }
        return (isc_hex_tobuffer(lexer, target, length));
}

static inline isc_result_t
totext_ds(ARGS_TOTEXT) {
        isc_region_t sr;
        char buf[sizeof("64000 ")];
        unsigned int n;

        REQUIRE(rdata->type == 43);
        REQUIRE(rdata->length != 0);

        UNUSED(tctx);

        dns_rdata_toregion(rdata, &sr);

        /*
         * Key tag.
         */
        n = uint16_fromregion(&sr);
        isc_region_consume(&sr, 2);
        sprintf(buf, "%u ", n);
        RETERR(str_totext(buf, target));

        /*
         * Algorithm.
         */
        n = uint8_fromregion(&sr);
        isc_region_consume(&sr, 1);
        sprintf(buf, "%u ", n);
        RETERR(str_totext(buf, target));

        /*
         * Digest type.
         */
        n = uint8_fromregion(&sr);
        isc_region_consume(&sr, 1);
        sprintf(buf, "%u", n);
        RETERR(str_totext(buf, target));

        /*
         * Digest.
         */
        if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
                RETERR(str_totext(" (", target));
        RETERR(str_totext(tctx->linebreak, target));
        if ((tctx->flags & DNS_STYLEFLAG_NOCRYPTO) == 0) {
                if (tctx->width == 0) /* No splitting */
                        RETERR(isc_hex_totext(&sr, 0, "", target));
                else
                        RETERR(isc_hex_totext(&sr, tctx->width - 2,
                                              tctx->linebreak, target));
        } else
                RETERR(str_totext("[omitted]", target));
        if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
                RETERR(str_totext(" )", target));
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_ds(ARGS_FROMWIRE) {
        isc_region_t sr;

        REQUIRE(type == 43);

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

        isc_buffer_activeregion(source, &sr);

        /*
         * Check digest lengths if we know them.
         */
        if (sr.length < 4 ||
            (sr.base[3] == DNS_DSDIGEST_SHA1 &&
             sr.length < 4 + ISC_SHA1_DIGESTLENGTH) ||
            (sr.base[3] == DNS_DSDIGEST_SHA256 &&
             sr.length < 4 + ISC_SHA256_DIGESTLENGTH) ||
#ifdef ISC_GOST_DIGESTLENGTH
            (sr.base[3] == DNS_DSDIGEST_GOST &&
             sr.length < 4 + ISC_GOST_DIGESTLENGTH) ||
#endif
            (sr.base[3] == DNS_DSDIGEST_SHA384 &&
             sr.length < 4 + ISC_SHA384_DIGESTLENGTH))
                return (ISC_R_UNEXPECTEDEND);

        /*
         * Only copy digest lengths if we know them.
         * If there is extra data dns_rdata_fromwire() will
         * detect that.
         */
        if (sr.base[3] == DNS_DSDIGEST_SHA1)
                sr.length = 4 + ISC_SHA1_DIGESTLENGTH;
        else if (sr.base[3] == DNS_DSDIGEST_SHA256)
                sr.length = 4 + ISC_SHA256_DIGESTLENGTH;
#ifdef ISC_GOST_DIGESTLENGTH
        else if (sr.base[3] == DNS_DSDIGEST_GOST)
                sr.length = 4 + ISC_GOST_DIGESTLENGTH;
#endif
        else if (sr.base[3] == DNS_DSDIGEST_SHA384)
                sr.length = 4 + ISC_SHA384_DIGESTLENGTH;

        isc_buffer_forward(source, sr.length);
        return (mem_tobuffer(target, sr.base, sr.length));
}

static inline isc_result_t
towire_ds(ARGS_TOWIRE) {
        isc_region_t sr;

        REQUIRE(rdata->type == 43);
        REQUIRE(rdata->length != 0);

        UNUSED(cctx);

        dns_rdata_toregion(rdata, &sr);
        return (mem_tobuffer(target, sr.base, sr.length));
}

static inline int
compare_ds(ARGS_COMPARE) {
        isc_region_t r1;
        isc_region_t r2;

        REQUIRE(rdata1->type == rdata2->type);
        REQUIRE(rdata1->rdclass == rdata2->rdclass);
        REQUIRE(rdata1->type == 43);
        REQUIRE(rdata1->length != 0);
        REQUIRE(rdata2->length != 0);

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

static inline isc_result_t
fromstruct_ds(ARGS_FROMSTRUCT) {
        dns_rdata_ds_t *ds = source;

        REQUIRE(type == 43);
        REQUIRE(source != NULL);
        REQUIRE(ds->common.rdtype == type);
        REQUIRE(ds->common.rdclass == rdclass);
        switch (ds->digest_type) {
        case DNS_DSDIGEST_SHA1:
                REQUIRE(ds->length == ISC_SHA1_DIGESTLENGTH);
                break;
        case DNS_DSDIGEST_SHA256:
                REQUIRE(ds->length == ISC_SHA256_DIGESTLENGTH);
                break;
#ifdef ISC_GOST_DIGESTLENGTH
        case DNS_DSDIGEST_GOST:
                REQUIRE(ds->length == ISC_GOST_DIGESTLENGTH);
                break;
#endif
        case DNS_DSDIGEST_SHA384:
                REQUIRE(ds->length == ISC_SHA384_DIGESTLENGTH);
                break;
        }

        UNUSED(type);
        UNUSED(rdclass);

        RETERR(uint16_tobuffer(ds->key_tag, target));
        RETERR(uint8_tobuffer(ds->algorithm, target));
        RETERR(uint8_tobuffer(ds->digest_type, target));

        return (mem_tobuffer(target, ds->digest, ds->length));
}

static inline isc_result_t
tostruct_ds(ARGS_TOSTRUCT) {
        dns_rdata_ds_t *ds = target;
        isc_region_t region;

        REQUIRE(rdata->type == 43);
        REQUIRE(target != NULL);
        REQUIRE(rdata->length != 0);

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

        dns_rdata_toregion(rdata, &region);

        ds->key_tag = uint16_fromregion(&region);
        isc_region_consume(&region, 2);
        ds->algorithm = uint8_fromregion(&region);
        isc_region_consume(&region, 1);
        ds->digest_type = uint8_fromregion(&region);
        isc_region_consume(&region, 1);
        ds->length = region.length;

        ds->digest = mem_maybedup(mctx, region.base, region.length);
        if (ds->digest == NULL)
                return (ISC_R_NOMEMORY);

        ds->mctx = mctx;
        return (ISC_R_SUCCESS);
}

static inline void
freestruct_ds(ARGS_FREESTRUCT) {
        dns_rdata_ds_t *ds = source;

        REQUIRE(ds != NULL);
        REQUIRE(ds->common.rdtype == 43);

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

        if (ds->digest != NULL)
                isc_mem_free(ds->mctx, ds->digest);
        ds->mctx = NULL;
}

static inline isc_result_t
additionaldata_ds(ARGS_ADDLDATA) {
        REQUIRE(rdata->type == 43);

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

        return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_ds(ARGS_DIGEST) {
        isc_region_t r;

        REQUIRE(rdata->type == 43);

        dns_rdata_toregion(rdata, &r);

        return ((digest)(arg, &r));
}

static inline isc_boolean_t
checkowner_ds(ARGS_CHECKOWNER) {

        REQUIRE(type == 43);

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

        return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_ds(ARGS_CHECKNAMES) {

        REQUIRE(rdata->type == 43);

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

        return (ISC_TRUE);
}

static inline int
casecompare_ds(ARGS_COMPARE) {
        return (compare_ds(rdata1, rdata2));
}

#endif  /* RDATA_GENERIC_DS_43_C */

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