/*

 * 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.

 */

#include <stddef.h>

#include <stdlib.h>

#include <unistd.h>

#include <isc/ascii.h>

#include <isc/buffer.h>

#include <isc/util.h>

#include <dns/compress.h>

#include <dns/fixedname.h>

#include <dns/name.h>

#include "fuzz.h"

#include "old.h"

bool debug = false;

int

LLVMFuzzerInitialize(int *argc ISC_ATTR_UNUSED, char ***argv ISC_ATTR_UNUSED) {

  return 0;

}

int

LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

  isc_result_t new_result;

  isc_result_t old_result;

  dns_fixedname_t new_fixed;

  dns_fixedname_t old_fixed;

  dns_name_t *new_name = dns_fixedname_initname(&new_fixed);

  dns_name_t *old_name = dns_fixedname_initname(&old_fixed);

  dns_decompress_t dctx = DNS_DECOMPRESS_PERMITTED;

  isc_buffer_t new_buf;

  isc_buffer_t old_buf;

  /*

   * Output buffers may be partially used or undersized.

   */

  if (size > 0) {

    uint8_t add = *data++;

    size--;

    isc_buffer_add(&new_fixed.buffer, add);

    isc_buffer_add(&old_fixed.buffer, add);

  }

  /*

   * timeout faster if we hit a pointer loop

   */

  alarm(1);

  /*

   * We shift forward by half the input data to make an area

   * that pointers can refer back to.

   */

  isc_buffer_constinit(&new_buf, data, size);

  isc_buffer_add(&new_buf, size);

  isc_buffer_setactive(&new_buf, size);

  isc_buffer_forward(&new_buf, size / 2);

  new_result = dns_name_fromwire(new_name, &new_buf, dctx, NULL);

  isc_buffer_constinit(&old_buf, data, size);

  isc_buffer_add(&old_buf, size);

  isc_buffer_setactive(&old_buf, size);

  isc_buffer_forward(&old_buf, size / 2);

  old_result = old_name_fromwire(old_name, &old_buf, dctx, 0, NULL);

  REQUIRE(new_result == old_result);

  REQUIRE(dns_name_equal(new_name, old_name));

  REQUIRE(new_fixed.buffer.current == old_fixed.buffer.current);

  REQUIRE(new_fixed.buffer.active == old_fixed.buffer.active);

  REQUIRE(new_fixed.buffer.used == old_fixed.buffer.used);

  REQUIRE(new_fixed.buffer.length == old_fixed.buffer.length);

  REQUIRE(new_buf.base == old_buf.base);

  REQUIRE(new_buf.current == old_buf.current);

  REQUIRE(new_buf.active == old_buf.active);

  REQUIRE(new_buf.used == old_buf.used);

  REQUIRE(new_buf.length == old_buf.length);

  return 0;

}