/* MIT License

 *

 * Copyright (c) The c-ares project and its contributors

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 *

 * SPDX-License-Identifier: MIT

 */

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include "ares.h"

/* Include ares internal file for DNS protocol constants */

#include "ares_nameser.h"

int LLVMFuzzerTestOneInput(const unsigned char *data, unsigned long size);

/* Fuzzing on a query name isn't very useful as its already fuzzed as part

 * of the normal fuzzing operations.  So we'll disable this by default and

 * instead use this same fuzzer to validate our URI scheme parsers accessed

 * via ares_set_servers_csv() */

#ifdef USE_LEGACY_FUZZERS

/* Entrypoint for Clang's libfuzzer, exercising query creation. */

int LLVMFuzzerTestOneInput(const unsigned char *data, unsigned long size)

{

  /* Null terminate the data. */

  char          *name   = malloc(size + 1);

  unsigned char *buf    = NULL;

  int            buflen = 0;

  name[size]            = '\0';

  memcpy(name, data, size);

  ares_create_query(name, C_IN, T_AAAA, 1234, 0, &buf, &buflen, 1024);

  free(buf);

  free(name);

  return 0;

}

#else

int LLVMFuzzerTestOneInput(const unsigned char *data, unsigned long size)

{

  ares_channel_t *channel = NULL;

  char           *csv;

  ares_library_init(ARES_LIB_INIT_ALL);

  ares_init(&channel);

  /* Need to null-term data */

  csv = malloc(size + 1);

  memcpy(csv, data, size);

  csv[size] = '\0';

  ares_set_servers_csv(channel, csv);

  free(csv);

  ares_destroy(channel);

  ares_library_cleanup();

  return 0;

}

#endif