/*

 * 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.

 */

/*

 * Copyright (C) 2004  Nominet, Ltd.

 *

 * Permission to use, copy, modify, and 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 NOMINET 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.

 */

/* RFC 5155 */

#ifndef RDATA_GENERIC_NSEC3PARAM_51_C

#define RDATA_GENERIC_NSEC3PARAM_51_C

#include <isc/base32.h>

#include <isc/iterated_hash.h>

#define RRTYPE_NSEC3PARAM_ATTRIBUTES (DNS_RDATATYPEATTR_DNSSEC)

static isc_result_t

fromtext_nsec3param(ARGS_FROMTEXT) {

  isc_token_t token;

  unsigned int flags = 0;

  unsigned char hashalg;

  REQUIRE(type == dns_rdatatype_nsec3param);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(callbacks);

  UNUSED(origin);

  UNUSED(options);

  /* Hash. */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,

              false));

  RETTOK(dns_hashalg_fromtext(&hashalg, &token.value.as_textregion));

  RETERR(uint8_tobuffer(hashalg, target));

  /* Flags. */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

  flags = token.value.as_ulong;

  if (flags > 255U) {

    RETTOK(ISC_R_RANGE);

  }

  RETERR(uint8_tobuffer(flags, target));

  /* Iterations. */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

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

    RETTOK(ISC_R_RANGE);

  }

  RETERR(uint16_tobuffer(token.value.as_ulong, target));

  /* Salt. */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,

              false));

  if (token.value.as_textregion.length > (255 * 2)) {

    RETTOK(DNS_R_TEXTTOOLONG);

  }

  if (strcmp(DNS_AS_STR(token), "-") == 0) {

    RETERR(uint8_tobuffer(0, target));

  } else {

    RETERR(uint8_tobuffer(strlen(DNS_AS_STR(token)) / 2, target));

    RETERR(isc_hex_decodestring(DNS_AS_STR(token), target));

  }

  return ISC_R_SUCCESS;

}

static isc_result_t

totext_nsec3param(ARGS_TOTEXT) {

  isc_region_t sr;

  unsigned int i, j;

  unsigned char hash;

  unsigned char flags;

  char buf[sizeof("65535 ")];

  uint32_t iterations;

  REQUIRE(rdata->type == dns_rdatatype_nsec3param);

  REQUIRE(rdata->length != 0);

  UNUSED(tctx);

  dns_rdata_toregion(rdata, &sr);

  hash = uint8_fromregion(&sr);

  isc_region_consume(&sr, 1);

  flags = uint8_fromregion(&sr);

  isc_region_consume(&sr, 1);

  iterations = uint16_fromregion(&sr);

  isc_region_consume(&sr, 2);

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

  RETERR(str_totext(buf, target));

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

  RETERR(str_totext(buf, target));

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

  RETERR(str_totext(buf, target));

  j = uint8_fromregion(&sr);

  isc_region_consume(&sr, 1);

  INSIST(j <= sr.length);

  if (j != 0) {

    i = sr.length;

    sr.length = j;

    RETERR(isc_hex_totext(&sr, 1, "", target));

    sr.length = i - j;

  } else {

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

  }

  return ISC_R_SUCCESS;

}

static isc_result_t

fromwire_nsec3param(ARGS_FROMWIRE) {

  isc_region_t sr, rr;

  unsigned int saltlen;

  REQUIRE(type == dns_rdatatype_nsec3param);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(dctx);

  isc_buffer_activeregion(source, &sr);

  rr = sr;

  /* hash(1), flags(1), iterations(2), saltlen(1) */

  if (sr.length < 5U) {

    RETERR(DNS_R_FORMERR);

  }

  saltlen = sr.base[4];

  isc_region_consume(&sr, 5);

  if (sr.length != saltlen) {

    RETERR(DNS_R_FORMERR);

  }

  isc_region_consume(&sr, saltlen);

  RETERR(mem_tobuffer(target, rr.base, rr.length));

  isc_buffer_forward(source, rr.length);

  return ISC_R_SUCCESS;

}

static int

compare_nsec3param(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_nsec3param);

  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_nsec3param(ARGS_FROMSTRUCT) {

  dns_rdata_nsec3param_t *nsec3param = source;

  REQUIRE(type == dns_rdatatype_nsec3param);

  REQUIRE(nsec3param != NULL);

  REQUIRE(nsec3param->common.rdtype == type);

  REQUIRE(nsec3param->common.rdclass == rdclass);

  UNUSED(type);

  UNUSED(rdclass);

  RETERR(uint8_tobuffer(nsec3param->hash, target));

  RETERR(uint8_tobuffer(nsec3param->flags, target));

  RETERR(uint16_tobuffer(nsec3param->iterations, target));

  RETERR(uint8_tobuffer(nsec3param->salt.length, target));

  RETERR(mem_tobuffer(target, nsec3param->salt.base,

          nsec3param->salt.length));

  return ISC_R_SUCCESS;

}

static isc_result_t

tostruct_nsec3param(ARGS_TOSTRUCT) {

  isc_region_t region;

  dns_rdata_nsec3param_t *nsec3param = target;

  REQUIRE(rdata->type == dns_rdatatype_nsec3param);

  REQUIRE(nsec3param != NULL);

  REQUIRE(rdata->length != 0);

  DNS_RDATACOMMON_INIT(nsec3param, rdata->type, rdata->rdclass);

  region.base = rdata->data;

  region.length = rdata->length;

  nsec3param->hash = uint8_consume_fromregion(&region);

  nsec3param->flags = uint8_consume_fromregion(&region);

  nsec3param->iterations = uint16_consume_fromregion(&region);

  nsec3param->salt.length = uint8_consume_fromregion(&region);

  INSIST(nsec3param->salt.length == region.length);

  nsec3param->salt.base = region.base;

  isc_region_consume(&region, nsec3param->salt.length);

  return ISC_R_SUCCESS;

}

static isc_result_t

additionaldata_nsec3param(ARGS_ADDLDATA) {

  REQUIRE(rdata->type == dns_rdatatype_nsec3param);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(add);

  UNUSED(arg);

  return ISC_R_SUCCESS;

}

static isc_result_t

digest_nsec3param(ARGS_DIGEST) {

  isc_region_t r;

  REQUIRE(rdata->type == dns_rdatatype_nsec3param);

  dns_rdata_toregion(rdata, &r);

  return (digest)(arg, &r);

}

static bool

checkowner_nsec3param(ARGS_CHECKOWNER) {

  REQUIRE(type == dns_rdatatype_nsec3param);

  UNUSED(name);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(wildcard);

  return true;

}

static bool

checknames_nsec3param(ARGS_CHECKNAMES) {

  REQUIRE(rdata->type == dns_rdatatype_nsec3param);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(bad);

  return true;

}

static int

casecompare_nsec3param(ARGS_COMPARE) {

  return compare_nsec3param(rdata1, rdata2);

}

#endif /* RDATA_GENERIC_NSEC3PARAM_51_C */