/*

 * 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.

 */

/* RFC2535 */

#ifndef RDATA_GENERIC_RRSIG_46_C

#define RDATA_GENERIC_RRSIG_46_C

#define RRTYPE_RRSIG_ATTRIBUTES                                     \

  (DNS_RDATATYPEATTR_DNSSEC | DNS_RDATATYPEATTR_ZONECUTAUTH | \

   DNS_RDATATYPEATTR_ATCNAME)

static isc_result_t

fromtext_rrsig(ARGS_FROMTEXT) {

  isc_token_t token;

  unsigned char alg, c;

  long i;

  dns_rdatatype_t covered;

  char *e;

  isc_result_t result;

  isc_buffer_t buffer;

  uint32_t time_signed, time_expire;

  unsigned int used;

  REQUIRE(type == dns_rdatatype_rrsig);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(callbacks);

  /*

   * Type covered.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,

              false));

  result = dns_rdatatype_fromtext(&covered, &token.value.as_textregion);

  if (result != ISC_R_SUCCESS && result != ISC_R_NOTIMPLEMENTED) {

    i = strtol(DNS_AS_STR(token), &e, 10);

    if (i < 0 || i > 65535) {

      RETTOK(ISC_R_RANGE);

    }

    if (*e != 0) {

      RETTOK(result);

    }

    covered = (dns_rdatatype_t)i;

  }

  RETERR(uint16_tobuffer(covered, target));

  /*

   * Algorithm.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,

              false));

  RETTOK(dns_secalg_fromtext(&alg, &token.value.as_textregion));

  RETERR(mem_tobuffer(target, &alg, 1));

  /*

   * Labels.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

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

    RETTOK(ISC_R_RANGE);

  }

  c = (unsigned char)token.value.as_ulong;

  RETERR(mem_tobuffer(target, &c, 1));

  /*

   * Original ttl.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

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

  /*

   * Signature expiration.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,

              false));

  if (strlen(DNS_AS_STR(token)) <= 10U && *DNS_AS_STR(token) != '-' &&

      *DNS_AS_STR(token) != '+')

  {

    char *end;

    unsigned long u;

    uint64_t u64;

    u64 = u = strtoul(DNS_AS_STR(token), &end, 10);

    if (u == ULONG_MAX || *end != 0) {

      RETTOK(DNS_R_SYNTAX);

    }

    if (u64 > 0xffffffffUL) {

      RETTOK(ISC_R_RANGE);

    }

    time_expire = u;

  } else {

    RETTOK(dns_time32_fromtext(DNS_AS_STR(token), &time_expire));

  }

  RETERR(uint32_tobuffer(time_expire, target));

  /*

   * Time signed.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,

              false));

  if (strlen(DNS_AS_STR(token)) <= 10U && *DNS_AS_STR(token) != '-' &&

      *DNS_AS_STR(token) != '+')

  {

    char *end;

    unsigned long u;

    uint64_t u64;

    u64 = u = strtoul(DNS_AS_STR(token), &end, 10);

    if (u == ULONG_MAX || *end != 0) {

      RETTOK(DNS_R_SYNTAX);

    }

    if (u64 > 0xffffffffUL) {

      RETTOK(ISC_R_RANGE);

    }

    time_signed = u;

  } else {

    RETTOK(dns_time32_fromtext(DNS_AS_STR(token), &time_signed));

  }

  RETERR(uint32_tobuffer(time_signed, target));

  /*

   * Key footprint.

   */

  RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,

              false));

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

  /*

   * Signer.

   */

  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));

  /*

   * Sig.

   */

  used = isc_buffer_usedlength(target);

  RETERR(isc_base64_tobuffer(lexer, target, -2));

  if (alg == DNS_KEYALG_PRIVATEDNS || alg == DNS_KEYALG_PRIVATEOID) {

    isc_buffer_t b;

    /*

     * Set up 'b' so that the signature data can be parsed.

     */

    b = *target;

    b.active = b.used;

    b.current = used;

    RETERR(check_private(&b, alg));

  }

  return ISC_R_SUCCESS;

}

static isc_result_t

totext_rrsig(ARGS_TOTEXT) {

  isc_region_t sr;

  char buf[sizeof("4294967295")]; /* Also TYPE65000. */

  dns_rdatatype_t covered;

  unsigned long ttl;

  unsigned long when;

  unsigned long exp;

  unsigned long foot;

  dns_name_t name;

  REQUIRE(rdata->type == dns_rdatatype_rrsig);

  REQUIRE(rdata->length != 0);

  dns_rdata_toregion(rdata, &sr);

  /*

   * Type covered.

   */

  covered = uint16_fromregion(&sr);

  isc_region_consume(&sr, 2);

  /*

   * XXXAG We should have something like dns_rdatatype_isknown()

   * that does the right thing with type 0.

   */

  if (dns_rdatatype_isknown(covered) && covered != 0) {

    RETERR(dns_rdatatype_totext(covered, target));

  } else {

    snprintf(buf, sizeof(buf), "TYPE%u", covered);

    RETERR(str_totext(buf, target));

  }

  RETERR(str_totext(" ", target));

  /*

   * Algorithm.

   */

  snprintf(buf, sizeof(buf), "%u", sr.base[0]);

  isc_region_consume(&sr, 1);

  RETERR(str_totext(buf, target));

  RETERR(str_totext(" ", target));

  /*

   * Labels.

   */

  snprintf(buf, sizeof(buf), "%u", sr.base[0]);

  isc_region_consume(&sr, 1);

  RETERR(str_totext(buf, target));

  RETERR(str_totext(" ", target));

  /*

   * Ttl.

   */

  ttl = uint32_fromregion(&sr);

  isc_region_consume(&sr, 4);

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

  RETERR(str_totext(buf, target));

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

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

  }

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

  /*

   * Sig exp.

   */

  exp = uint32_fromregion(&sr);

  isc_region_consume(&sr, 4);

  RETERR(dns_time32_totext(exp, target));

  RETERR(str_totext(" ", target));

  /*

   * Time signed.

   */

  when = uint32_fromregion(&sr);

  isc_region_consume(&sr, 4);

  RETERR(dns_time32_totext(when, target));

  RETERR(str_totext(" ", target));

  /*

   * Footprint.

   */

  foot = uint16_fromregion(&sr);

  isc_region_consume(&sr, 2);

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

  RETERR(str_totext(buf, target));

  RETERR(str_totext(" ", target));

  /*

   * Signer.

   */

  dns_name_init(&name);

  dns_name_fromregion(&name, &sr);

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

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

  /*

   * Sig.

   */

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

  if ((tctx->flags & DNS_STYLEFLAG_NOCRYPTO) == 0) {

    if (tctx->width == 0) { /* No splitting */

      RETERR(isc_base64_totext(&sr, 60, "", target));

    } else {

      RETERR(isc_base64_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_rrsig(ARGS_FROMWIRE) {

  isc_region_t sr;

  dns_name_t name;

  unsigned char algorithm;

  REQUIRE(type == dns_rdatatype_rrsig);

  UNUSED(type);

  UNUSED(rdclass);

  dctx = dns_decompress_setpermitted(dctx, false);

  isc_buffer_activeregion(source, &sr);

  /*

   * type covered: 2

   * algorithm: 1

   * labels: 1

   * original ttl: 4

   * signature expiration: 4

   * time signed: 4

   * key footprint: 2

   */

  if (sr.length < 18) {

    return ISC_R_UNEXPECTEDEND;

  }

  algorithm = sr.base[2];

  isc_buffer_forward(source, 18);

  RETERR(mem_tobuffer(target, sr.base, 18));

  /*

   * Signer.

   */

  dns_name_init(&name);

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

  /*

   * Sig.

   */

  isc_buffer_activeregion(source, &sr);

  if (sr.length < 1) {

    return DNS_R_FORMERR;

  }

  if (algorithm == DNS_KEYALG_PRIVATEDNS ||

      algorithm == DNS_KEYALG_PRIVATEOID)

  {

    isc_buffer_t b = *source;

    RETERR(check_private(&b, algorithm));

  }

  isc_buffer_forward(source, sr.length);

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

}

static isc_result_t

towire_rrsig(ARGS_TOWIRE) {

  isc_region_t sr;

  dns_name_t name;

  REQUIRE(rdata->type == dns_rdatatype_rrsig);

  REQUIRE(rdata->length != 0);

  dns_compress_setpermitted(cctx, false);

  dns_rdata_toregion(rdata, &sr);

  /*

   * type covered: 2

   * algorithm: 1

   * labels: 1

   * original ttl: 4

   * signature expiration: 4

   * time signed: 4

   * key footprint: 2

   */

  RETERR(mem_tobuffer(target, sr.base, 18));

  isc_region_consume(&sr, 18);

  /*

   * Signer.

   */

  dns_name_init(&name);

  dns_name_fromregion(&name, &sr);

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

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

  /*

   * Signature.

   */

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

}

static int

compare_rrsig(ARGS_COMPARE) {

  isc_region_t r1;

  isc_region_t r2;

  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_rrsig);

  REQUIRE(rdata1->length != 0);

  REQUIRE(rdata2->length != 0);

  dns_rdata_toregion(rdata1, &r1);

  dns_rdata_toregion(rdata2, &r2);

  INSIST(r1.length > 18);

  INSIST(r2.length > 18);

  r1.length = 18;

  r2.length = 18;

  order = isc_region_compare(&r1, &r2);

  if (order != 0) {

    return order;

  }

  dns_name_init(&name1);

  dns_name_init(&name2);

  dns_rdata_toregion(rdata1, &r1);

  dns_rdata_toregion(rdata2, &r2);

  isc_region_consume(&r1, 18);

  isc_region_consume(&r2, 18);

  dns_name_fromregion(&name1, &r1);

  dns_name_fromregion(&name2, &r2);

  order = dns_name_rdatacompare(&name1, &name2);

  if (order != 0) {

    return order;

  }

  isc_region_consume(&r1, name_length(&name1));

  isc_region_consume(&r2, name_length(&name2));

  return isc_region_compare(&r1, &r2);

}

static isc_result_t

fromstruct_rrsig(ARGS_FROMSTRUCT) {

  dns_rdata_rrsig_t *sig = source;

  REQUIRE(type == dns_rdatatype_rrsig);

  REQUIRE(sig != NULL);

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

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

  REQUIRE(sig->signature != NULL || sig->siglen == 0);

  UNUSED(type);

  UNUSED(rdclass);

  /*

   * Type covered.

   */

  RETERR(uint16_tobuffer(sig->covered, target));

  /*

   * Algorithm.

   */

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

  /*

   * Labels.

   */

  RETERR(uint8_tobuffer(sig->labels, target));

  /*

   * Original TTL.

   */

  RETERR(uint32_tobuffer(sig->originalttl, target));

  /*

   * Expire time.

   */

  RETERR(uint32_tobuffer(sig->timeexpire, target));

  /*

   * Time signed.

   */

  RETERR(uint32_tobuffer(sig->timesigned, target));

  /*

   * Key ID.

   */

  RETERR(uint16_tobuffer(sig->keyid, target));

  /*

   * Signer name.

   */

  RETERR(name_tobuffer(&sig->signer, target));

  /*

   * Signature.

   */

  return mem_tobuffer(target, sig->signature, sig->siglen);

}

static isc_result_t

tostruct_rrsig(ARGS_TOSTRUCT) {

  isc_region_t sr;

  dns_rdata_rrsig_t *sig = target;

  dns_name_t signer;

  REQUIRE(rdata->type == dns_rdatatype_rrsig);

  REQUIRE(sig != NULL);

  REQUIRE(rdata->length != 0);

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

  dns_rdata_toregion(rdata, &sr);

  /*

   * Type covered.

   */

  sig->covered = uint16_fromregion(&sr);

  isc_region_consume(&sr, 2);

  /*

   * Algorithm.

   */

  sig->algorithm = uint8_fromregion(&sr);

  isc_region_consume(&sr, 1);

  /*

   * Labels.

   */

  sig->labels = uint8_fromregion(&sr);

  isc_region_consume(&sr, 1);

  /*

   * Original TTL.

   */

  sig->originalttl = uint32_fromregion(&sr);

  isc_region_consume(&sr, 4);

  /*

   * Expire time.

   */

  sig->timeexpire = uint32_fromregion(&sr);

  isc_region_consume(&sr, 4);

  /*

   * Time signed.

   */

  sig->timesigned = uint32_fromregion(&sr);

  isc_region_consume(&sr, 4);

  /*

   * Key ID.

   */

  sig->keyid = uint16_fromregion(&sr);

  isc_region_consume(&sr, 2);

  dns_name_init(&signer);

  dns_name_fromregion(&signer, &sr);

  dns_name_init(&sig->signer);

  name_duporclone(&signer, mctx, &sig->signer);

  isc_region_consume(&sr, name_length(&sig->signer));

  /*

   * Signature.

   */

  sig->siglen = sr.length;

  sig->signature = mem_maybedup(mctx, sr.base, sig->siglen);

  sig->mctx = mctx;

  return ISC_R_SUCCESS;

}

static void

freestruct_rrsig(ARGS_FREESTRUCT) {

  dns_rdata_rrsig_t *sig = (dns_rdata_rrsig_t *)source;

  REQUIRE(sig != NULL);

  REQUIRE(sig->common.rdtype == dns_rdatatype_rrsig);

  if (sig->mctx == NULL) {

    return;

  }

  dns_name_free(&sig->signer, sig->mctx);

  if (sig->signature != NULL) {

    isc_mem_free(sig->mctx, sig->signature);

  }

  sig->mctx = NULL;

}

static isc_result_t

additionaldata_rrsig(ARGS_ADDLDATA) {

  REQUIRE(rdata->type == dns_rdatatype_rrsig);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(add);

  UNUSED(arg);

  return ISC_R_SUCCESS;

}

static isc_result_t

digest_rrsig(ARGS_DIGEST) {

  isc_region_t r1, r2;

  dns_name_t name;

  REQUIRE(rdata->type == dns_rdatatype_rrsig);

  dns_rdata_toregion(rdata, &r1);

  r2 = r1;

  /*

   * Type covered (2) + Algorithm (1) +

   * Labels (1) + Original TTL (4) +

   * Expire time (4) +  Time signed (4) +

   * Key ID (2).

   */

  isc_region_consume(&r2, 18);

  r1.length = 18;

  RETERR((digest)(arg, &r1));

  /* Signer */

  dns_name_init(&name);

  dns_name_fromregion(&name, &r2);

  RETERR(dns_name_digest(&name, digest, arg));

  isc_region_consume(&r2, name_length(&name));

  /* Signature */

  return (digest)(arg, &r2);

}

static dns_rdatatype_t

covers_rrsig(dns_rdata_t *rdata) {

  dns_rdatatype_t type;

  isc_region_t r;

  REQUIRE(rdata->type == dns_rdatatype_rrsig);

  dns_rdata_toregion(rdata, &r);

  type = uint16_fromregion(&r);

  return type;

}

static bool

checkowner_rrsig(ARGS_CHECKOWNER) {

  REQUIRE(type == dns_rdatatype_rrsig);

  UNUSED(name);

  UNUSED(type);

  UNUSED(rdclass);

  UNUSED(wildcard);

  return true;

}

static bool

checknames_rrsig(ARGS_CHECKNAMES) {

  REQUIRE(rdata->type == dns_rdatatype_rrsig);

  UNUSED(rdata);

  UNUSED(owner);

  UNUSED(bad);

  return true;

}

static int

casecompare_rrsig(ARGS_COMPARE) {

  return compare_rrsig(rdata1, rdata2);

}

#endif /* RDATA_GENERIC_RRSIG_46_C */