text: /*
   * Copyright 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 "s2n_test.h"
  
  #include "tls/extensions/s2n_client_max_frag_len.h"
  #include "tls/s2n_tls.h"
  
  int main(int argc, char **argv)
  {
      BEGIN_TEST();
      EXPECT_SUCCESS(s2n_disable_tls13());
  
      /* Test should_send */
      {
          struct s2n_config *config;
          EXPECT_NOT_NULL(config = s2n_config_new());
  
          struct s2n_connection *conn;
          EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
          EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
  
          EXPECT_SUCCESS(s2n_config_send_max_fragment_length(config, S2N_TLS_MAX_FRAG_LEN_EXT_NONE));
          EXPECT_FALSE(s2n_client_max_frag_len_extension.should_send(conn));
  
          EXPECT_SUCCESS(s2n_config_send_max_fragment_length(config, S2N_TLS_MAX_FRAG_LEN_512));
          EXPECT_TRUE(s2n_client_max_frag_len_extension.should_send(conn));
  
          EXPECT_SUCCESS(s2n_connection_free(conn));
          EXPECT_SUCCESS(s2n_config_free(config));
      }
  
      /* Test send */
      {
          struct s2n_config *config;
          EXPECT_NOT_NULL(config = s2n_config_new());
  
          struct s2n_connection *conn;
          EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
          EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
  
          struct s2n_stuffer stuffer;
          EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));
  
          EXPECT_SUCCESS(s2n_config_send_max_fragment_length(config, S2N_TLS_MAX_FRAG_LEN_512));
          EXPECT_SUCCESS(s2n_client_max_frag_len_extension.send(conn, &stuffer));
  
          /* Should have correct fragment length */
          uint8_t actual_frag_len;
          EXPECT_SUCCESS(s2n_stuffer_read_uint8(&stuffer, &actual_frag_len));
          EXPECT_EQUAL(actual_frag_len, S2N_TLS_MAX_FRAG_LEN_512);
          EXPECT_EQUAL(s2n_stuffer_data_available(&stuffer), 0);
  
          EXPECT_SUCCESS(s2n_stuffer_free(&stuffer));
          EXPECT_SUCCESS(s2n_connection_free(conn));
          EXPECT_SUCCESS(s2n_config_free(config));
      }
  
      /* Test receive - accept_mfl not set */
      {
          struct s2n_config *config;
          EXPECT_NOT_NULL(config = s2n_config_new());
  
          struct s2n_connection *conn;
          EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
          EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
  
          struct s2n_stuffer stuffer;
          EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));
  
          EXPECT_SUCCESS(s2n_config_send_max_fragment_length(config, S2N_TLS_MAX_FRAG_LEN_512));
          EXPECT_SUCCESS(s2n_client_max_frag_len_extension.send(conn, &stuffer));
  
          /* Ignore fragment length if not accepting max fragment length */
          EXPECT_FALSE(config->accept_mfl);
          EXPECT_SUCCESS(s2n_client_max_frag_len_extension.recv(conn, &stuffer));
          EXPECT_EQUAL(conn->negotiated_mfl_code, S2N_TLS_MAX_FRAG_LEN_EXT_NONE);
          EXPECT_EQUAL(conn->max_outgoing_fragment_length, S2N_DEFAULT_FRAGMENT_LENGTH);
  
          EXPECT_SUCCESS(s2n_stuffer_free(&stuffer));
          EXPECT_SUCCESS(s2n_connection_free(conn));
          EXPECT_SUCCESS(s2n_config_free(config));
      }
  
      /* Test receive - invalid mfl code
       *
       *= https://tools.ietf.org/rfc/rfc6066#section-4
       *= type=test
       *# If a server receives a maximum fragment length negotiation request
       *# for a value other than the allowed values, it MUST abort the
       *# handshake with an "illegal_parameter" alert.
       */
      {
          struct s2n_config *config;
          EXPECT_NOT_NULL(config = s2n_config_new());
          EXPECT_SUCCESS(s2n_config_accept_max_fragment_length(config));
  
          struct s2n_connection *conn;
          EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
          EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
  
          struct s2n_stuffer stuffer;
          EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));
  
          /* Send invalid mfl code */
          conn->config->mfl_code = UINT8_MAX;
          EXPECT_SUCCESS(s2n_client_max_frag_len_extension.send(conn, &stuffer));
  
          /* Ignore invalid mfl code */
          EXPECT_SUCCESS(s2n_client_max_frag_len_extension.recv(conn, &stuffer));
          EXPECT_EQUAL(conn->negotiated_mfl_code, S2N_TLS_MAX_FRAG_LEN_EXT_NONE);
          EXPECT_EQUAL(conn->max_outgoing_fragment_length, S2N_DEFAULT_FRAGMENT_LENGTH);
  
          EXPECT_SUCCESS(s2n_stuffer_free(&stuffer));
          EXPECT_SUCCESS(s2n_connection_free(conn));
          EXPECT_SUCCESS(s2n_config_free(config));
      }
  
      /* Test receive */
      {
          struct s2n_config *config;
          EXPECT_NOT_NULL(config = s2n_config_new());
          EXPECT_SUCCESS(s2n_config_accept_max_fragment_length(config));
  
          struct s2n_connection *conn;
          EXPECT_NOT_NULL(conn = s2n_connection_new(S2N_CLIENT));
          EXPECT_SUCCESS(s2n_connection_set_config(conn, config));
  
          struct s2n_stuffer stuffer;
          EXPECT_SUCCESS(s2n_stuffer_growable_alloc(&stuffer, 0));
  
          EXPECT_SUCCESS(s2n_config_send_max_fragment_length(conn->config, S2N_TLS_MAX_FRAG_LEN_512));
          EXPECT_SUCCESS(s2n_client_max_frag_len_extension.send(conn, &stuffer));
  
          /* Accept valid mfl code */
          EXPECT_SUCCESS(s2n_client_max_frag_len_extension.recv(conn, &stuffer));
          EXPECT_EQUAL(conn->negotiated_mfl_code, S2N_TLS_MAX_FRAG_LEN_512);
          EXPECT_EQUAL(conn->max_outgoing_fragment_length, mfl_code_to_length[S2N_TLS_MAX_FRAG_LEN_512]);
          EXPECT_EQUAL(s2n_stuffer_data_available(&stuffer), 0);
  
          EXPECT_SUCCESS(s2n_stuffer_free(&stuffer));
          EXPECT_SUCCESS(s2n_connection_free(conn));
          EXPECT_SUCCESS(s2n_config_free(config));
      }
  
      END_TEST();
      return 0;
  }
  