//
// ssl/context_base.hpp
// ~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef ASIO_SSL_CONTEXT_BASE_HPP
#define ASIO_SSL_CONTEXT_BASE_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"
#include "asio/ssl/detail/openssl_types.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
namespace ssl {

/// The context_base class is used as a base for the basic_context class
/// template so that we have a common place to define various enums.
class context_base
{
public:
  /// Different methods supported by a context.
  enum method
  {
    /// Generic SSL version 2.
    sslv2,

    /// SSL version 2 client.
    sslv2_client,

    /// SSL version 2 server.
    sslv2_server,

    /// Generic SSL version 3.
    sslv3,

    /// SSL version 3 client.
    sslv3_client,

    /// SSL version 3 server.
    sslv3_server,

    /// Generic TLS version 1.
    tlsv1,

    /// TLS version 1 client.
    tlsv1_client,

    /// TLS version 1 server.
    tlsv1_server,

    /// Generic SSL/TLS.
    sslv23,

    /// SSL/TLS client.
    sslv23_client,

    /// SSL/TLS server.
    sslv23_server,

    /// Generic TLS version 1.1.
    tlsv11,

    /// TLS version 1.1 client.
    tlsv11_client,

    /// TLS version 1.1 server.
    tlsv11_server,

    /// Generic TLS version 1.2.
    tlsv12,

    /// TLS version 1.2 client.
    tlsv12_client,

    /// TLS version 1.2 server.
    tlsv12_server,

    /// Generic TLS version 1.3.
    tlsv13,

    /// TLS version 1.3 client.
    tlsv13_client,

    /// TLS version 1.3 server.
    tlsv13_server,

    /// Generic TLS.
    tls,

    /// TLS client.
    tls_client,

    /// TLS server.
    tls_server
  };

  /// Bitmask type for SSL options.
  typedef long options;

#if defined(GENERATING_DOCUMENTATION)
  /// Implement various bug workarounds.
  static const long default_workarounds = implementation_defined;

  /// Always create a new key when using tmp_dh parameters.
  static const long single_dh_use = implementation_defined;

  /// Disable SSL v2.
  static const long no_sslv2 = implementation_defined;

  /// Disable SSL v3.
  static const long no_sslv3 = implementation_defined;

  /// Disable TLS v1.
  static const long no_tlsv1 = implementation_defined;

  /// Disable TLS v1.1.
  static const long no_tlsv1_1 = implementation_defined;

  /// Disable TLS v1.2.
  static const long no_tlsv1_2 = implementation_defined;

  /// Disable TLS v1.3.
  static const long no_tlsv1_3 = implementation_defined;

  /// Disable compression. Compression is disabled by default.
  static const long no_compression = implementation_defined;
#else
  ASIO_STATIC_CONSTANT(long, default_workarounds = SSL_OP_ALL);
  ASIO_STATIC_CONSTANT(long, single_dh_use = SSL_OP_SINGLE_DH_USE);
  ASIO_STATIC_CONSTANT(long, no_sslv2 = SSL_OP_NO_SSLv2);
  ASIO_STATIC_CONSTANT(long, no_sslv3 = SSL_OP_NO_SSLv3);
  ASIO_STATIC_CONSTANT(long, no_tlsv1 = SSL_OP_NO_TLSv1);
# if defined(SSL_OP_NO_TLSv1_1)
  ASIO_STATIC_CONSTANT(long, no_tlsv1_1 = SSL_OP_NO_TLSv1_1);
# else // defined(SSL_OP_NO_TLSv1_1)
  ASIO_STATIC_CONSTANT(long, no_tlsv1_1 = 0x10000000L);
# endif // defined(SSL_OP_NO_TLSv1_1)
# if defined(SSL_OP_NO_TLSv1_2)
  ASIO_STATIC_CONSTANT(long, no_tlsv1_2 = SSL_OP_NO_TLSv1_2);
# else // defined(SSL_OP_NO_TLSv1_2)
  ASIO_STATIC_CONSTANT(long, no_tlsv1_2 = 0x08000000L);
# endif // defined(SSL_OP_NO_TLSv1_2)
# if defined(SSL_OP_NO_TLSv1_3)
  ASIO_STATIC_CONSTANT(long, no_tlsv1_3 = SSL_OP_NO_TLSv1_3);
# else // defined(SSL_OP_NO_TLSv1_3)
  ASIO_STATIC_CONSTANT(long, no_tlsv1_3 = 0x20000000L);
# endif // defined(SSL_OP_NO_TLSv1_3)
# if defined(SSL_OP_NO_COMPRESSION)
  ASIO_STATIC_CONSTANT(long, no_compression = SSL_OP_NO_COMPRESSION);
# else // defined(SSL_OP_NO_COMPRESSION)
  ASIO_STATIC_CONSTANT(long, no_compression = 0x20000L);
# endif // defined(SSL_OP_NO_COMPRESSION)
#endif

  /// File format types.
  enum file_format
  {
    /// ASN.1 file.
    asn1,

    /// PEM file.
    pem
  };

#if !defined(GENERATING_DOCUMENTATION)
  // The following types and constants are preserved for backward compatibility.
  // New programs should use the equivalents of the same names that are defined
  // in the asio::ssl namespace.
  typedef int verify_mode;
  ASIO_STATIC_CONSTANT(int, verify_none = SSL_VERIFY_NONE);
  ASIO_STATIC_CONSTANT(int, verify_peer = SSL_VERIFY_PEER);
  ASIO_STATIC_CONSTANT(int,
      verify_fail_if_no_peer_cert = SSL_VERIFY_FAIL_IF_NO_PEER_CERT);
  ASIO_STATIC_CONSTANT(int, verify_client_once = SSL_VERIFY_CLIENT_ONCE);
#endif

  /// Purpose of PEM password.
  enum password_purpose
  {
    /// The password is needed for reading/decryption.
    for_reading,

    /// The password is needed for writing/encryption.
    for_writing
  };

protected:
  /// Protected destructor to prevent deletion through this type.
  ~context_base()
  {
  }
};

} // namespace ssl
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_SSL_CONTEXT_BASE_HPP