rdata/generic/ds_43.c

	ds_43.c revision 0c27b3fe77ac1d5094ba3521e8142d9e7973133f
/*
 * Copyright (C) 2002, 2004, 2005, 2007, 2009-2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * 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 http://mozilla.org/MPL/2.0/.
 */

/* $Id$ */

/* 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
generic_fromtext_ds(ARGS_FROMTEXT) {
    isc_token_t token;
    unsigned char c;
    int length;

    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
fromtext_ds(ARGS_FROMTEXT) {

    REQUIRE(type == dns_rdatatype_ds);

    return (generic_fromtext_ds(rdclass, type, lexer, origin, options,
                    target, callbacks));
}

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

    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
totext_ds(ARGS_TOTEXT) {

    REQUIRE(rdata->type == dns_rdatatype_ds);

    return (generic_totext_ds(rdata, tctx, target));
}

static inline isc_result_t
generic_fromwire_ds(ARGS_FROMWIRE) {
    isc_region_t sr;

    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
fromwire_ds(ARGS_FROMWIRE) {

    REQUIRE(type == dns_rdatatype_ds);

    return (generic_fromwire_ds(rdclass, type, source, dctx, options,
                    target));
}

static inline isc_result_t
towire_ds(ARGS_TOWIRE) {
    isc_region_t sr;

    REQUIRE(rdata->type == dns_rdatatype_ds);
    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 == dns_rdatatype_ds);
    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
generic_fromstruct_ds(ARGS_FROMSTRUCT) {
    dns_rdata_ds_t *ds = source;

    REQUIRE(source != NULL);
    REQUIRE(ds->common.rdtype == type);
    REQUIRE(ds->common.rdclass == rdclass);

    UNUSED(type);
    UNUSED(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;
    }

    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
fromstruct_ds(ARGS_FROMSTRUCT) {

    REQUIRE(type == dns_rdatatype_ds);

    return (generic_fromstruct_ds(rdclass, type, source, target));
}

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

    REQUIRE(target != NULL);
    REQUIRE(rdata->length != 0);
    REQUIRE(ds->common.rdtype == rdata->type);
    REQUIRE(ds->common.rdclass == rdata->rdclass);
    REQUIRE(!ISC_LINK_LINKED(&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 isc_result_t
tostruct_ds(ARGS_TOSTRUCT) {
    dns_rdata_ds_t *ds = target;

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

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

    return (generic_tostruct_ds(rdata, target, mctx));
}

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

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

    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 == dns_rdatatype_ds);

    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 == dns_rdatatype_ds);

    dns_rdata_toregion(rdata, &r);

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

static inline isc_boolean_t
checkowner_ds(ARGS_CHECKOWNER) {

    REQUIRE(type == dns_rdatatype_ds);

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

    return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_ds(ARGS_CHECKNAMES) {

    REQUIRE(rdata->type == dns_rdatatype_ds);

    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 */