test/ares-test-fuzz.c

/*
 * Copyright (C) The c-ares project
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting
 * documentation, and that the name of M.I.T. not be used in
 * advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * SPDX-License-Identifier: MIT
 */
#include <stddef.h>

#include "ares.h"

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

// Entrypoint for Clang's libfuzzer
int LLVMFuzzerTestOneInput(const unsigned char *data, unsigned long size)
{
  // Feed the data into each of the ares_parse_*_reply functions.
  struct hostent          *host = NULL;
  struct ares_addrttl      info[5];
  struct ares_addr6ttl     info6[5];
  unsigned char            addrv4[4] = { 0x10, 0x20, 0x30, 0x40 };
  struct ares_srv_reply   *srv       = NULL;
  struct ares_mx_reply    *mx        = NULL;
  struct ares_txt_reply   *txt       = NULL;
  struct ares_soa_reply   *soa       = NULL;
  struct ares_naptr_reply *naptr     = NULL;
  struct ares_caa_reply   *caa       = NULL;
  struct ares_uri_reply   *uri       = NULL;
  int                      count     = 5;
  ares_parse_a_reply(data, (int)size, &host, info, &count);
  if (host) {
    ares_free_hostent(host);
  }

  host  = NULL;
  count = 5;
  ares_parse_aaaa_reply(data, (int)size, &host, info6, &count);
  if (host) {
    ares_free_hostent(host);
  }

  host = NULL;
  ares_parse_ptr_reply(data, (int)size, addrv4, sizeof(addrv4), AF_INET, &host);
  if (host) {
    ares_free_hostent(host);
  }

  host = NULL;
  ares_parse_ns_reply(data, (int)size, &host);
  if (host) {
    ares_free_hostent(host);
  }

  ares_parse_srv_reply(data, (int)size, &srv);
  if (srv) {
    ares_free_data(srv);
  }

  ares_parse_mx_reply(data, (int)size, &mx);
  if (mx) {
    ares_free_data(mx);
  }

  ares_parse_txt_reply(data, (int)size, &txt);
  if (txt) {
    ares_free_data(txt);
  }

  ares_parse_soa_reply(data, (int)size, &soa);
  if (soa) {
    ares_free_data(soa);
  }

  ares_parse_naptr_reply(data, (int)size, &naptr);
  if (naptr) {
    ares_free_data(naptr);
  }

  ares_parse_caa_reply(data, (int)size, &caa);
  if (caa) {
    ares_free_data(caa);
  }

  ares_parse_uri_reply(data, (int)size, &uri);
  if (uri) {
    ares_free_data(uri);
  }

  return 0;
}