text: /*
   * Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License").
   * You may not use this file except in compliance with the License.
   * A copy of the License is located at
   *
   *  http://aws.amazon.com/apache2.0
   *
   * or in the "license" file accompanying this file. This file is distributed
   * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
   * express or implied. See the License for the specific language governing
   * permissions and limitations under the License.
   */
  
  #include <errno.h>
  #include <fcntl.h>
  #include <stddef.h>
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  #include "api/s2n.h"
  #include "stuffer/s2n_stuffer.h"
  #include "tls/s2n_cipher_suites.h"
  #include "tls/s2n_config.h"
  #include "tls/s2n_connection.h"
  #include "tls/s2n_crypto.h"
  #include "tls/s2n_tls.h"
  #include "tls/s2n_tls_parameters.h"
  #include "utils/s2n_safety.h"
  #include "s2n_test.h"
  
  static void s2n_client_cert_req_recv_fuzz_atexit()
  {
      s2n_cleanup();
  }
  
  int LLVMFuzzerInitialize(const uint8_t *buf, size_t len)
  {
      GUARD(s2n_init());
      GUARD(atexit(s2n_client_cert_req_recv_fuzz_atexit));
      GUARD(setenv("S2N_ENABLE_CLIENT_MODE", "1", 0));
      return 0;
  }
  
  static const uint8_t TLS_VERSIONS[] = {S2N_TLS10, S2N_TLS11, S2N_TLS12};
  
  int LLVMFuzzerTestOneInput(const uint8_t *buf, size_t len)
  {
      for(int i = 0; i < sizeof(TLS_VERSIONS); i++){
          /* Setup */
          struct s2n_config *client_config = s2n_config_new();
          s2n_config_disable_x509_verification(client_config);
          struct s2n_connection *client_conn = s2n_connection_new(S2N_CLIENT);
          notnull_check(client_conn);
          client_conn->actual_protocol_version = TLS_VERSIONS[i];
          s2n_connection_set_config(client_conn, client_config);
          GUARD(s2n_stuffer_write_bytes(&client_conn->handshake.io, buf, len));
  
          /* Run Test
           * Do not use GUARD macro here since the connection memory hasn't been freed.
           */
          s2n_client_cert_req_recv(client_conn);
  
          /* Cleanup */
          GUARD(s2n_connection_free(client_conn));
          GUARD(s2n_config_free(client_config));
      }
  
      return 0;
  }
  