/*

 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")

 *

 * SPDX-License-Identifier: MPL-2.0

 *

 * 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 https://mozilla.org/MPL/2.0/.

 *

 * See the COPYRIGHT file distributed with this work for additional

 * information regarding copyright ownership.

 */

/* RFC 8976 */

#ifndef RDATA_GENERIC_ZONEMD_63_C

#define RDATA_GENERIC_ZONEMD_63_C

#define RRTYPE_ZONEMD_ATTRIBUTES 0

static isc_result_t

fromtext_zonemd(ARGS_FROMTEXT) {

  isc_token_t token;

  int digest_type, length;

  isc_buffer_t save;

  isc_result_t result;

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(origin);

  UNUSED(options);

  UNUSED(callbacks);

  /*

   * Zone Serial.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

  RETERR(uint32_tobuffer(token.value.as_ulong, target));

  /*

   * Digest Scheme.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

  RETERR(uint8_tobuffer(token.value.as_ulong, target));

  /*

   * Digest Type.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

  digest_type = token.value.as_ulong;

  RETERR(uint8_tobuffer(digest_type, target));

  /*

   * Digest.

   */

  switch (digest_type) {

  case DNS_ZONEMD_DIGEST_SHA384:

    length = ISC_SHA384_DIGESTLENGTH;

    break;

  case DNS_ZONEMD_DIGEST_SHA512:

    length = ISC_SHA512_DIGESTLENGTH;

    break;

  default:

    length = -2;

    break;

  }

  save = *target;

  result = isc_hex_tobuffer(lexer, target, length);

  /* Minimum length of digest is 12 octets. */

  if (isc_buffer_usedlength(target) - isc_buffer_usedlength(&save) < 12) {

    return ISC_R_UNEXPECTEDEND;

  }

  return result;

}

static isc_result_t

totext_zonemd(ARGS_TOTEXT) {

  isc_region_t sr;

  char buf[sizeof("0123456789")];

  unsigned long num;

  REQUIRE(rdata->length > 6);

  UNUSED(tctx);

  dns_rdata_toregion(rdata, &sr);

  /*

   * Zone Serial.

   */

  num = uint32_fromregion(&sr);

  isc_region_consume(&sr, 4);

  snprintf(buf, sizeof(buf), "%lu", num);

  RETERR(str_totext(buf, target));

  RETERR(str_totext(" ", target));

  /*

   * Digest scheme.

   */

  num = uint8_fromregion(&sr);

  isc_region_consume(&sr, 1);

  snprintf(buf, sizeof(buf), "%lu", num);

  RETERR(str_totext(buf, target));

  RETERR(str_totext(" ", target));

  /*

   * Digest type.

   */

  num = uint8_fromregion(&sr);

  isc_region_consume(&sr, 1);

  snprintf(buf, sizeof(buf), "%lu", num);

  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 isc_result_t

fromwire_zonemd(ARGS_FROMWIRE) {

  isc_region_t sr;

  size_t digestlen = 0;

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(dctx);

  isc_buffer_activeregion(source, &sr);

  /*

   * If we do not recognize the digest type, ensure that the digest

   * meets minimum length (12).

   *

   * If we do recognize the digest type, ensure that the digest is of the

   * correct length.

   */

  if (sr.length < 18) {

    return ISC_R_UNEXPECTEDEND;

  }

  switch (sr.base[5]) {

  case DNS_ZONEMD_DIGEST_SHA384:

    digestlen = ISC_SHA384_DIGESTLENGTH;

    break;

  case DNS_ZONEMD_DIGEST_SHA512:

    digestlen = ISC_SHA512_DIGESTLENGTH;

    break;

  default:

    break;

  }

  if (digestlen != 0 && sr.length < 6 + digestlen) {

    return ISC_R_UNEXPECTEDEND;

  }

  /*

   * Only specify the number of octets to consume if we recognize the

   * digest type.

   *

   * If there is extra data, dns_rdata_fromwire() will detect that.

   */

  if (digestlen != 0) {

    sr.length = 6 + digestlen;

  }

  isc_buffer_forward(source, sr.length);

  return mem_tobuffer(target, sr.base, sr.length);

}

static isc_result_t

towire_zonemd(ARGS_TOWIRE) {

  isc_region_t sr;

  REQUIRE(rdata->type == dns_rdatatype_zonemd);

  REQUIRE(rdata->length != 0);

  UNUSED(cctx);

  dns_rdata_toregion(rdata, &sr);

  return mem_tobuffer(target, sr.base, sr.length);

}

static int

compare_zonemd(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_zonemd);

  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 isc_result_t

fromstruct_zonemd(ARGS_FROMSTRUCT) {

  dns_rdata_zonemd_t *zonemd = source;

  REQUIRE(zonemd != NULL);

  REQUIRE(zonemd->common.rdtype == type);

  REQUIRE(zonemd->common.rdclass == rdclass);

  UNUSED(type);

  UNUSED(rdclass);

  switch (zonemd->digest_type) {

  case DNS_ZONEMD_DIGEST_SHA384:

    REQUIRE(zonemd->length == ISC_SHA384_DIGESTLENGTH);

    break;

  case DNS_ZONEMD_DIGEST_SHA512:

    REQUIRE(zonemd->length == ISC_SHA512_DIGESTLENGTH);

    break;

  }

  RETERR(uint32_tobuffer(zonemd->serial, target));

  RETERR(uint8_tobuffer(zonemd->scheme, target));

  RETERR(uint8_tobuffer(zonemd->digest_type, target));

  return mem_tobuffer(target, zonemd->digest, zonemd->length);

}

static isc_result_t

tostruct_zonemd(ARGS_TOSTRUCT) {

  dns_rdata_zonemd_t *zonemd = target;

  isc_region_t region;

  REQUIRE(rdata->type == dns_rdatatype_zonemd);

  REQUIRE(zonemd != NULL);

  REQUIRE(rdata->length != 0);

  DNS_RDATACOMMON_INIT(zonemd, rdata->type, rdata->rdclass);

  dns_rdata_toregion(rdata, &region);

  zonemd->serial = uint32_fromregion(&region);

  isc_region_consume(&region, 4);

  zonemd->scheme = uint8_fromregion(&region);

  isc_region_consume(&region, 1);

  zonemd->digest_type = uint8_fromregion(&region);

  isc_region_consume(&region, 1);

  zonemd->length = region.length;

  zonemd->digest = mem_maybedup(mctx, region.base, region.length);

  zonemd->mctx = mctx;

  return ISC_R_SUCCESS;

}

static void

freestruct_zonemd(ARGS_FREESTRUCT) {

  dns_rdata_zonemd_t *zonemd = source;

  REQUIRE(zonemd != NULL);

  REQUIRE(zonemd->common.rdtype == dns_rdatatype_zonemd);

  if (zonemd->mctx == NULL) {

    return;

  }

  if (zonemd->digest != NULL) {

    isc_mem_free(zonemd->mctx, zonemd->digest);

  }

  zonemd->mctx = NULL;

}

static isc_result_t

additionaldata_zonemd(ARGS_ADDLDATA) {

  REQUIRE(rdata->type == dns_rdatatype_zonemd);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(add);

  UNUSED(arg);

  return ISC_R_SUCCESS;

}

static isc_result_t

digest_zonemd(ARGS_DIGEST) {

  isc_region_t r;

  REQUIRE(rdata->type == dns_rdatatype_zonemd);

  dns_rdata_toregion(rdata, &r);

  return (digest)(arg, &r);

}

static bool

checkowner_zonemd(ARGS_CHECKOWNER) {

  REQUIRE(type == dns_rdatatype_zonemd);

  UNUSED(name);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(wildcard);

  return true;

}

static bool

checknames_zonemd(ARGS_CHECKNAMES) {

  REQUIRE(rdata->type == dns_rdatatype_zonemd);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(bad);

  return true;

}

static int

casecompare_zonemd(ARGS_COMPARE) {

  return compare_zonemd(rdata1, rdata2);

}

#endif /* RDATA_GENERIC_ZONEMD_63_C */