socks_connect.cpp

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// Copyright (c) 2019, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
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//    used to endorse or promote products derived from this software without specific
//    prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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#include "socks_connect.h"
 
#include <boost/system/error_code.hpp>
#include <boost/system/system_error.hpp>
#include <cstdint>
#include <memory>
#include <system_error>
 
#include "net/error.h"
#include "net/net_utils_base.h"
#include "net/socks.h"
#include "string_tools.h"
 
namespace net
{
namespace socks
{
    boost::unique_future<boost::asio::ip::tcp::socket>
    connector::operator()(const std::string& remote_host, const std::string& remote_port, boost::asio::steady_timer& timeout) const
    {
        struct future_socket
        {
            boost::promise<boost::asio::ip::tcp::socket> result_;
 
            void operator()(boost::system::error_code error, boost::asio::ip::tcp::socket&& socket)
            {
                if (error)
                    result_.set_exception(boost::system::system_error{error});
                else
                    result_.set_value(std::move(socket));
            }
        };
 
        boost::unique_future<boost::asio::ip::tcp::socket> out{};
        {
            std::uint16_t port = 0;
            if (!epee::string_tools::get_xtype_from_string(port, remote_port))
                throw std::system_error{net::error::invalid_port, "Remote port for socks proxy"};
 
            bool is_set = false;
            std::uint32_t ip_address = 0;
            boost::promise<boost::asio::ip::tcp::socket> result{};
            out = result.get_future();
            const auto proxy = net::socks::make_connect_client(
                boost::asio::ip::tcp::socket{GET_IO_SERVICE(timeout)}, net::socks::version::v4a, future_socket{std::move(result)}
            );
 
            if (epee::string_tools::get_ip_int32_from_string(ip_address, remote_host))
                is_set = proxy->set_connect_command(epee::net_utils::ipv4_network_address{ip_address, port});
            else
                is_set = proxy->set_connect_command(remote_host, port);
 
            if (!is_set || !net::socks::client::connect_and_send(proxy, proxy_address))
                throw std::system_error{net::error::invalid_host, "Address for socks proxy"};
 
            timeout.async_wait(net::socks::client::async_close{std::move(proxy)});
        }
 
        return out;
    }
} // socks
} // net