/*

 * 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 4255 */

#ifndef RDATA_GENERIC_SSHFP_44_C

#define RDATA_GENERIC_SSHFP_44_C

#define RRTYPE_SSHFP_ATTRIBUTES (0)

static isc_result_t

fromtext_sshfp(ARGS_FROMTEXT) {

  isc_token_t token;

  int len = -1;

  REQUIRE(type == dns_rdatatype_sshfp);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(origin);

  UNUSED(options);

  UNUSED(callbacks);

  /*

   * Algorithm.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

  if (token.value.as_ulong > 0xffU) {

    RETTOK(ISC_R_RANGE);

  }

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

  /*

   * Digest type.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

  if (token.value.as_ulong > 0xffU) {

    RETTOK(ISC_R_RANGE);

  }

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

  /*

   * Enforce known digest lengths.

   */

  switch (token.value.as_ulong) {

  case 1:

    len = ISC_SHA1_DIGESTLENGTH;

    break;

  case 2:

    len = ISC_SHA256_DIGESTLENGTH;

    break;

  default:

    break;

  }

  /*

   * Digest.

   */

  return isc_hex_tobuffer(lexer, target, len);

}

static isc_result_t

totext_sshfp(ARGS_TOTEXT) {

  isc_region_t sr;

  char buf[sizeof("64000 ")];

  unsigned int n;

  REQUIRE(rdata->type == dns_rdatatype_sshfp);

  REQUIRE(rdata->length != 0);

  UNUSED(tctx);

  dns_rdata_toregion(rdata, &sr);

  /*

   * Algorithm.

   */

  n = uint8_fromregion(&sr);

  isc_region_consume(&sr, 1);

  snprintf(buf, sizeof(buf), "%u ", n);

  RETERR(str_totext(buf, target));

  /*

   * Digest type.

   */

  n = uint8_fromregion(&sr);

  isc_region_consume(&sr, 1);

  snprintf(buf, sizeof(buf), "%u", n);

  RETERR(str_totext(buf, target));

  if (sr.length == 0U) {

    return ISC_R_SUCCESS;

  }

  /*

   * Digest.

   */

  if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0) {

    RETERR(str_totext(" (", target));

  }

  RETERR(str_totext(tctx->linebreak, target));

  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));

  }

  if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0) {

    RETERR(str_totext(" )", target));

  }

  return ISC_R_SUCCESS;

}

static isc_result_t

fromwire_sshfp(ARGS_FROMWIRE) {

  isc_region_t sr;

  REQUIRE(type == dns_rdatatype_sshfp);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(dctx);

  isc_buffer_activeregion(source, &sr);

  if (sr.length < 2) {

    return ISC_R_UNEXPECTEDEND;

  }

  if ((sr.base[1] == 1 && sr.length != ISC_SHA1_DIGESTLENGTH + 2) ||

      (sr.base[1] == 2 && sr.length != ISC_SHA256_DIGESTLENGTH + 2))

  {

    return DNS_R_FORMERR;

  }

  isc_buffer_forward(source, sr.length);

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

}

static isc_result_t

towire_sshfp(ARGS_TOWIRE) {

  isc_region_t sr;

  REQUIRE(rdata->type == dns_rdatatype_sshfp);

  REQUIRE(rdata->length != 0);

  UNUSED(cctx);

  dns_rdata_toregion(rdata, &sr);

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

}

static int

compare_sshfp(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_sshfp);

  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_sshfp(ARGS_FROMSTRUCT) {

  dns_rdata_sshfp_t *sshfp = source;

  REQUIRE(type == dns_rdatatype_sshfp);

  REQUIRE(sshfp != NULL);

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

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

  UNUSED(type);

  UNUSED(rdclass);

  RETERR(uint8_tobuffer(sshfp->algorithm, target));

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

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

}

static isc_result_t

tostruct_sshfp(ARGS_TOSTRUCT) {

  dns_rdata_sshfp_t *sshfp = target;

  isc_region_t region;

  REQUIRE(rdata->type == dns_rdatatype_sshfp);

  REQUIRE(sshfp != NULL);

  REQUIRE(rdata->length != 0);

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

  dns_rdata_toregion(rdata, &region);

  sshfp->algorithm = uint8_fromregion(&region);

  isc_region_consume(&region, 1);

  sshfp->digest_type = uint8_fromregion(&region);

  isc_region_consume(&region, 1);

  sshfp->length = region.length;

  sshfp->digest = region.base;

  return ISC_R_SUCCESS;

}

static isc_result_t

additionaldata_sshfp(ARGS_ADDLDATA) {

  REQUIRE(rdata->type == dns_rdatatype_sshfp);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(add);

  UNUSED(arg);

  return ISC_R_SUCCESS;

}

static isc_result_t

digest_sshfp(ARGS_DIGEST) {

  isc_region_t r;

  REQUIRE(rdata->type == dns_rdatatype_sshfp);

  dns_rdata_toregion(rdata, &r);

  return (digest)(arg, &r);

}

static bool

checkowner_sshfp(ARGS_CHECKOWNER) {

  REQUIRE(type == dns_rdatatype_sshfp);

  UNUSED(name);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(wildcard);

  return true;

}

static bool

checknames_sshfp(ARGS_CHECKNAMES) {

  REQUIRE(rdata->type == dns_rdatatype_sshfp);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(bad);

  return true;

}

static int

casecompare_sshfp(ARGS_COMPARE) {

  return compare_sshfp(rdata1, rdata2);

}

#endif /* RDATA_GENERIC_SSHFP_44_C */