classic_greeting_receiver.h

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/*
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  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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*/
 
#ifndef ROUTING_SRC_PROCESSORS_SESSION_CLASSIC_GREETING_RECEIVER_H_
#define ROUTING_SRC_PROCESSORS_SESSION_CLASSIC_GREETING_RECEIVER_H_
 
#include "processors/base/processor.h"
 
/**
 * classic protocol handshake between client<->router (and router<->server).
 *
 *
 */
class ClientGreetor : public Processor {
 public:
  using Processor::Processor;
 
  /**
   * stages of the handshake flow.
   */
  enum class Stage {
    Init,
    ServerGreeting,
    ServerFirstGreeting,
    ClientGreeting,
    TlsAcceptInit,
    TlsAccept,
    ClientGreetingAfterTls,
    RequestPlaintextPassword,
    PlaintextPassword,
    DecryptPassword,
    Accepted,
    Authenticated,
 
    Error,
    Ok,
  };
 
  stdx::expected<Result, std::error_code> process() override;
 
  void stage(Stage stage) { stage_ = stage; }
  [[nodiscard]] Stage stage() const { return stage_; }
 
  std::optional<std::string_view> diagnostic_stage_name() const override;
 
 private:
  stdx::expected<Result, std::error_code> init();
  stdx::expected<Result, std::error_code> server_greeting();
  stdx::expected<Result, std::error_code> server_first_greeting();
  stdx::expected<Result, std::error_code> client_greeting();
  stdx::expected<Result, std::error_code> tls_accept_init();
  stdx::expected<Result, std::error_code> tls_accept();
  stdx::expected<Result, std::error_code> client_greeting_after_tls();
  stdx::expected<Result, std::error_code> request_plaintext_password();
  stdx::expected<Result, std::error_code> plaintext_password();
  stdx::expected<Result, std::error_code> decrypt_password();
  stdx::expected<Result, std::error_code> accepted();
  stdx::expected<Result, std::error_code> authenticated();
  stdx::expected<Result, std::error_code> error();
 
  Stage stage_{Stage::Init};
 
  classic_protocol::message::server::Error connect_err_{};
};
 
#endif  // ROUTING_SRC_PROCESSORS_SESSION_CLASSIC_GREETING_RECEIVER_H_