rdata/generic/dnskey_48.c

/*
 * Copyright (C) 2004, 2005, 2007, 2012, 2013  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 2003  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.
 */

/* $Id$ */

/*
 * Reviewed: Wed Mar 15 16:47:10 PST 2000 by halley.
 */

/* RFC2535 */

#ifndef RDATA_GENERIC_DNSKEY_48_C
#define RDATA_GENERIC_DNSKEY_48_C

#include <dst/dst.h>

#define RRTYPE_DNSKEY_ATTRIBUTES (DNS_RDATATYPEATTR_DNSSEC)

static inline isc_result_t
fromtext_dnskey(ARGS_FROMTEXT) {
    isc_result_t result;
    isc_token_t token;
    dns_secalg_t alg;
    dns_secproto_t proto;
    dns_keyflags_t flags;

    REQUIRE(type == 48);

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

    /* flags */
    RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                      ISC_FALSE));
    RETTOK(dns_keyflags_fromtext(&flags, &token.value.as_textregion));
    RETERR(uint16_tobuffer(flags, target));

    /* protocol */
    RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                      ISC_FALSE));
    RETTOK(dns_secproto_fromtext(&proto, &token.value.as_textregion));
    RETERR(mem_tobuffer(target, &proto, 1));

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

    /* No Key? */
    if ((flags & 0xc000) == 0xc000)
        return (ISC_R_SUCCESS);

    result = isc_base64_tobuffer(lexer, target, -1);
    if (result != ISC_R_SUCCESS)
        return (result);

    /* Ensure there's at least enough data to compute a key ID for MD5 */
    if (alg == DST_ALG_RSAMD5 && isc_buffer_usedlength(target) < 7)
        return (ISC_R_UNEXPECTEDEND);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
totext_dnskey(ARGS_TOTEXT) {
    isc_region_t sr;
    char buf[sizeof("64000")];
    unsigned int flags;
    unsigned char algorithm;

    REQUIRE(rdata->type == 48);
    REQUIRE(rdata->length != 0);

    dns_rdata_toregion(rdata, &sr);

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

    /* protocol */
    sprintf(buf, "%u", sr.base[0]);
    isc_region_consume(&sr, 1);
    RETERR(str_totext(buf, target));
    RETERR(str_totext(" ", target));

    /* algorithm */
    algorithm = sr.base[0];
    sprintf(buf, "%u", algorithm);
    isc_region_consume(&sr, 1);
    RETERR(str_totext(buf, target));

    /* No Key? */
    if ((flags & 0xc000) == 0xc000)
        return (ISC_R_SUCCESS);

    /* key */
    if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
        RETERR(str_totext(" (", target));
    RETERR(str_totext(tctx->linebreak, target));
    RETERR(isc_base64_totext(&sr, tctx->width - 2,
                 tctx->linebreak, target));

    if ((tctx->flags & DNS_STYLEFLAG_COMMENT) != 0)
        RETERR(str_totext(tctx->linebreak, target));
    else if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
        RETERR(str_totext(" ", target));

    if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
        RETERR(str_totext(")", target));

    if ((tctx->flags & DNS_STYLEFLAG_COMMENT) != 0) {
        isc_region_t tmpr;

        RETERR(str_totext(" ; key id = ", target));
        dns_rdata_toregion(rdata, &tmpr);
        sprintf(buf, "%u", dst_region_computeid(&tmpr, algorithm));
        RETERR(str_totext(buf, target));
    }
    return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_dnskey(ARGS_FROMWIRE) {
    isc_region_t sr;
    unsigned char algorithm;

    REQUIRE(type == 48);

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

    isc_buffer_activeregion(source, &sr);
    if (sr.length < 4)
        return (ISC_R_UNEXPECTEDEND);

    /*
     * RSAMD5 computes key ID differently from other
     * algorithms: we need to ensure there's enough data
     * present for the computation
     */
    algorithm = sr.base[3];
    if (algorithm == DST_ALG_RSAMD5 && sr.length < 7)
        return (ISC_R_UNEXPECTEDEND);

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

static inline isc_result_t
towire_dnskey(ARGS_TOWIRE) {
    isc_region_t sr;

    REQUIRE(rdata->type == 48);
    REQUIRE(rdata->length != 0);

    UNUSED(cctx);

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

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

    REQUIRE(rdata1->type == rdata2->type);
    REQUIRE(rdata1->rdclass == rdata2->rdclass);
    REQUIRE(rdata1->type == 48);
    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_dnskey(ARGS_FROMSTRUCT) {
    dns_rdata_dnskey_t *dnskey = source;

    REQUIRE(type == 48);
    REQUIRE(source != NULL);
    REQUIRE(dnskey->common.rdtype == type);
    REQUIRE(dnskey->common.rdclass == rdclass);

    UNUSED(type);
    UNUSED(rdclass);

    /* Flags */
    RETERR(uint16_tobuffer(dnskey->flags, target));

    /* Protocol */
    RETERR(uint8_tobuffer(dnskey->protocol, target));

    /* Algorithm */
    RETERR(uint8_tobuffer(dnskey->algorithm, target));

    /* Data */
    return (mem_tobuffer(target, dnskey->data, dnskey->datalen));
}

static inline isc_result_t
tostruct_dnskey(ARGS_TOSTRUCT) {
    dns_rdata_dnskey_t *dnskey = target;
    isc_region_t sr;

    REQUIRE(rdata->type == 48);
    REQUIRE(target != NULL);
    REQUIRE(rdata->length != 0);

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

    dns_rdata_toregion(rdata, &sr);

    /* Flags */
    if (sr.length < 2)
        return (ISC_R_UNEXPECTEDEND);
    dnskey->flags = uint16_fromregion(&sr);
    isc_region_consume(&sr, 2);

    /* Protocol */
    if (sr.length < 1)
        return (ISC_R_UNEXPECTEDEND);
    dnskey->protocol = uint8_fromregion(&sr);
    isc_region_consume(&sr, 1);

    /* Algorithm */
    if (sr.length < 1)
        return (ISC_R_UNEXPECTEDEND);
    dnskey->algorithm = uint8_fromregion(&sr);
    isc_region_consume(&sr, 1);

    /* Data */
    dnskey->datalen = sr.length;
    dnskey->data = mem_maybedup(mctx, sr.base, dnskey->datalen);
    if (dnskey->data == NULL)
        return (ISC_R_NOMEMORY);

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

static inline void
freestruct_dnskey(ARGS_FREESTRUCT) {
    dns_rdata_dnskey_t *dnskey = (dns_rdata_dnskey_t *) source;

    REQUIRE(source != NULL);
    REQUIRE(dnskey->common.rdtype == 48);

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

    if (dnskey->data != NULL)
        isc_mem_free(dnskey->mctx, dnskey->data);
    dnskey->mctx = NULL;
}

static inline isc_result_t
additionaldata_dnskey(ARGS_ADDLDATA) {
    REQUIRE(rdata->type == 48);

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

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_dnskey(ARGS_DIGEST) {
    isc_region_t r;

    REQUIRE(rdata->type == 48);

    dns_rdata_toregion(rdata, &r);

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

static inline isc_boolean_t
checkowner_dnskey(ARGS_CHECKOWNER) {

    REQUIRE(type == 48);

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

    return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_dnskey(ARGS_CHECKNAMES) {

    REQUIRE(rdata->type == 48);

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

    return (ISC_TRUE);
}

#endif  /* RDATA_GENERIC_DNSKEY_48_C */