socks_connecter.hpp

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/* SPDX-License-Identifier: MPL-2.0 */
 
#ifndef __SOCKS_CONNECTER_HPP_INCLUDED__
#define __SOCKS_CONNECTER_HPP_INCLUDED__
 
#include "fd.hpp"
#include "stream_connecter_base.hpp"
#include "stdint.hpp"
#include "socks.hpp"
 
namespace zmq
{
class io_thread_t;
class session_base_t;
struct address_t;
 
class socks_connecter_t ZMQ_FINAL : public stream_connecter_base_t
{
  public:
    //  If 'delayed_start' is true connecter first waits for a while,
    //  then starts connection process.
    socks_connecter_t (zmq::io_thread_t *io_thread_,
                       zmq::session_base_t *session_,
                       const options_t &options_,
                       address_t *addr_,
                       address_t *proxy_addr_,
                       bool delayed_start_);
    ~socks_connecter_t ();
 
    void set_auth_method_basic (const std::string &username,
                                const std::string &password);
    void set_auth_method_none ();
 
 
  private:
    enum
    {
        unplugged,
        waiting_for_reconnect_time,
        waiting_for_proxy_connection,
        sending_greeting,
        waiting_for_choice,
        sending_basic_auth_request,
        waiting_for_auth_response,
        sending_request,
        waiting_for_response
    };
 
    //  Method ID
    enum
    {
        socks_no_auth_required = 0x00,
        socks_basic_auth = 0x02,
        socks_no_acceptable_method = 0xff
    };
 
    //  Handlers for I/O events.
    void in_event ();
    void out_event ();
 
    //  Internal function to start the actual connection establishment.
    void start_connecting ();
 
    static int process_server_response (const socks_choice_t &response_);
    static int process_server_response (const socks_response_t &response_);
    static int process_server_response (const socks_auth_response_t &response_);
 
    static int parse_address (const std::string &address_,
                              std::string &hostname_,
                              uint16_t &port_);
 
    int connect_to_proxy ();
 
    void error ();
 
    //  Open TCP connecting socket. Returns -1 in case of error,
    //  0 if connect was successful immediately. Returns -1 with
    //  EAGAIN errno if async connect was launched.
    int open ();
 
    //  Get the file descriptor of newly created connection. Returns
    //  retired_fd if the connection was unsuccessful.
    zmq::fd_t check_proxy_connection () const;
 
    socks_greeting_encoder_t _greeting_encoder;
    socks_choice_decoder_t _choice_decoder;
    socks_basic_auth_request_encoder_t _basic_auth_request_encoder;
    socks_auth_response_decoder_t _auth_response_decoder;
    socks_request_encoder_t _request_encoder;
    socks_response_decoder_t _response_decoder;
 
    //  SOCKS address; owned by this connecter.
    address_t *_proxy_addr;
 
    // User defined authentication method
    int _auth_method;
 
    // Credentials for basic authentication
    std::string _auth_username;
    std::string _auth_password;
 
    int _status;
 
    ZMQ_NON_COPYABLE_NOR_MOVABLE (socks_connecter_t)
};
}
 
#endif