/*

 * 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 3845 */

#ifndef RDATA_GENERIC_NSEC_47_C

#define RDATA_GENERIC_NSEC_47_C

/*

 * The attributes do not include DNS_RDATATYPEATTR_SINGLETON

 * because we must be able to handle a parent/child NSEC pair.

 */

#define RRTYPE_NSEC_ATTRIBUTES                                      \

  (DNS_RDATATYPEATTR_DNSSEC | DNS_RDATATYPEATTR_ZONECUTAUTH | \

   DNS_RDATATYPEATTR_ATCNAME)

static isc_result_t

fromtext_nsec(ARGS_FROMTEXT) {

  isc_token_t token;

  isc_buffer_t buffer;

  REQUIRE(type == dns_rdatatype_nsec);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(callbacks);

  /*

   * Next domain.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,

              false));

  buffer_fromregion(&buffer, &token.value.as_region);

  if (origin == NULL) {

    origin = dns_rootname;

  }

  RETTOK(dns_name_wirefromtext(&buffer, origin, options, target));

  return typemap_fromtext(lexer, target, false);

}

static isc_result_t

totext_nsec(ARGS_TOTEXT) {

  isc_region_t sr;

  dns_name_t name;

  REQUIRE(rdata->type == dns_rdatatype_nsec);

  REQUIRE(rdata->length != 0);

  UNUSED(tctx);

  dns_name_init(&name);

  dns_rdata_toregion(rdata, &sr);

  dns_name_fromregion(&name, &sr);

  isc_region_consume(&sr, name_length(&name));

  RETERR(dns_name_totext(&name, 0, target));

  /*

   * Don't leave a trailing space when there's no typemap present.

   */

  if (sr.length > 0) {

    RETERR(str_totext(" ", target));

  }

  return typemap_totext(&sr, NULL, target);

}

static isc_result_t

fromwire_nsec(ARGS_FROMWIRE) {

  isc_region_t sr;

  dns_name_t name;

  REQUIRE(type == dns_rdatatype_nsec);

  UNUSED(type);

  UNUSED(rdclass);

  dctx = dns_decompress_setpermitted(dctx, false);

  dns_name_init(&name);

  RETERR(dns_name_fromwire(&name, source, dctx, target));

  isc_buffer_activeregion(source, &sr);

  RETERR(typemap_test(&sr, false));

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

  isc_buffer_forward(source, sr.length);

  return ISC_R_SUCCESS;

}

static isc_result_t

towire_nsec(ARGS_TOWIRE) {

  isc_region_t sr;

  dns_name_t name;

  REQUIRE(rdata->type == dns_rdatatype_nsec);

  REQUIRE(rdata->length != 0);

  dns_compress_setpermitted(cctx, false);

  dns_name_init(&name);

  dns_rdata_toregion(rdata, &sr);

  dns_name_fromregion(&name, &sr);

  isc_region_consume(&sr, name_length(&name));

  RETERR(dns_name_towire(&name, cctx, target));

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

}

static int

compare_nsec(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_nsec);

  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_nsec(ARGS_FROMSTRUCT) {

  dns_rdata_nsec_t *nsec = source;

  isc_region_t region;

  REQUIRE(type == dns_rdatatype_nsec);

  REQUIRE(nsec != NULL);

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

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

  REQUIRE(nsec->typebits != NULL || nsec->len == 0);

  UNUSED(type);

  UNUSED(rdclass);

  dns_name_toregion(&nsec->next, &region);

  RETERR(isc_buffer_copyregion(target, &region));

  region.base = nsec->typebits;

  region.length = nsec->len;

  RETERR(typemap_test(&region, false));

  return mem_tobuffer(target, nsec->typebits, nsec->len);

}

static isc_result_t

tostruct_nsec(ARGS_TOSTRUCT) {

  isc_region_t region;

  dns_rdata_nsec_t *nsec = target;

  dns_name_t name;

  REQUIRE(rdata->type == dns_rdatatype_nsec);

  REQUIRE(nsec != NULL);

  REQUIRE(rdata->length != 0);

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

  dns_name_init(&name);

  dns_rdata_toregion(rdata, &region);

  dns_name_fromregion(&name, &region);

  isc_region_consume(&region, name_length(&name));

  dns_name_init(&nsec->next);

  name_duporclone(&name, mctx, &nsec->next);

  nsec->len = region.length;

  nsec->typebits = mem_maybedup(mctx, region.base, region.length);

  nsec->mctx = mctx;

  return ISC_R_SUCCESS;

}

static void

freestruct_nsec(ARGS_FREESTRUCT) {

  dns_rdata_nsec_t *nsec = source;

  REQUIRE(nsec != NULL);

  REQUIRE(nsec->common.rdtype == dns_rdatatype_nsec);

  if (nsec->mctx == NULL) {

    return;

  }

  dns_name_free(&nsec->next, nsec->mctx);

  if (nsec->typebits != NULL) {

    isc_mem_free(nsec->mctx, nsec->typebits);

  }

  nsec->mctx = NULL;

}

static isc_result_t

additionaldata_nsec(ARGS_ADDLDATA) {

  REQUIRE(rdata->type == dns_rdatatype_nsec);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(add);

  UNUSED(arg);

  return ISC_R_SUCCESS;

}

static isc_result_t

digest_nsec(ARGS_DIGEST) {

  isc_region_t r;

  REQUIRE(rdata->type == dns_rdatatype_nsec);

  dns_rdata_toregion(rdata, &r);

  return (digest)(arg, &r);

}

static bool

checkowner_nsec(ARGS_CHECKOWNER) {

  REQUIRE(type == dns_rdatatype_nsec);

  UNUSED(name);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(wildcard);

  return true;

}

static bool

checknames_nsec(ARGS_CHECKNAMES) {

  REQUIRE(rdata->type == dns_rdatatype_nsec);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(bad);

  return true;

}

static int

casecompare_nsec(ARGS_COMPARE) {

  isc_region_t region1;

  isc_region_t region2;

  dns_name_t name1;

  dns_name_t name2;

  int order;

  REQUIRE(rdata1->type == rdata2->type);

  REQUIRE(rdata1->rdclass == rdata2->rdclass);

  REQUIRE(rdata1->type == dns_rdatatype_nsec);

  REQUIRE(rdata1->length != 0);

  REQUIRE(rdata2->length != 0);

  dns_name_init(&name1);

  dns_name_init(&name2);

  dns_rdata_toregion(rdata1, &region1);

  dns_rdata_toregion(rdata2, &region2);

  dns_name_fromregion(&name1, &region1);

  dns_name_fromregion(&name2, &region2);

  order = dns_name_rdatacompare(&name1, &name2);

  if (order != 0) {

    return order;

  }

  isc_region_consume(&region1, name_length(&name1));

  isc_region_consume(&region2, name_length(&name2));

  return isc_region_compare(&region1, &region2);

}

#endif /* RDATA_GENERIC_NSEC_47_C */