在 cpp (boost::Asio) 中从浏览器检索我的代理的地址

Question

我正在尝试修改 TCP 代理的示例代码以便在我的浏览器上使用它。

这是我使用的完整代理：

#include <cstdlib>
#include <cstddef>
#include <iostream>
#include <string>

#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/bind.hpp>
#include <boost/asio.hpp>
#include <boost/thread/mutex.hpp>


namespace tcp_proxy
{
   namespace ip = boost::asio::ip;

   class bridge : public boost::enable_shared_from_this<bridge>
   {
   public:

      typedef ip::tcp::socket socket_type;
      typedef boost::shared_ptr<bridge> ptr_type;

      bridge(boost::asio::io_service& ios)
      : downstream_socket_(ios),
        upstream_socket_(ios)
      {}

      socket_type& downstream_socket()
      {
         return downstream_socket_;
      }

      socket_type& upstream_socket()
      {
         return upstream_socket_;
      }

      void start(const std::string& upstream_host, unsigned short upstream_port)
      {
         upstream_socket_.async_connect(
              ip::tcp::endpoint(
                   boost::asio::ip::address::from_string(upstream_host),
                   upstream_port),
               boost::bind(&bridge::handle_upstream_connect,
                    shared_from_this(),
                    boost::asio::placeholders::error));
      }

      void handle_upstream_connect(const boost::system::error_code& error)
      {
         if (!error)
         {
            upstream_socket_.async_read_some(
                 boost::asio::buffer(upstream_data_,max_data_length),
                 boost::bind(&bridge::handle_upstream_read,
                      shared_from_this(),
                      boost::asio::placeholders::error,
                      boost::asio::placeholders::bytes_transferred));

            downstream_socket_.async_read_some(
                 boost::asio::buffer(downstream_data_,max_data_length),
                 boost::bind(&bridge::handle_downstream_read,
                      shared_from_this(),
                      boost::asio::placeholders::error,
                      boost::asio::placeholders::bytes_transferred));
         }
         else
            close();
      }

   private:

      void handle_downstream_write(const boost::system::error_code& error)
      {
         if (!error)
         {
            upstream_socket_.async_read_some(
                 boost::asio::buffer(upstream_data_,max_data_length),
                 boost::bind(&bridge::handle_upstream_read,
                      shared_from_this(),
                      boost::asio::placeholders::error,
                      boost::asio::placeholders::bytes_transferred));
         }
         else
            close();
      }

      void handle_downstream_read(const boost::system::error_code& error,
                                  const size_t& bytes_transferred)
      {
         if (!error)
         {
            async_write(upstream_socket_,
                  boost::asio::buffer(downstream_data_,bytes_transferred),
                  boost::bind(&bridge::handle_upstream_write,
                        shared_from_this(),
                        boost::asio::placeholders::error));
         }
         else
            close();
      }

      void handle_upstream_write(const boost::system::error_code& error)
      {
         if (!error)
         {
            downstream_socket_.async_read_some(
                 boost::asio::buffer(downstream_data_,max_data_length),
                 boost::bind(&bridge::handle_downstream_read,
                      shared_from_this(),
                      boost::asio::placeholders::error,
                      boost::asio::placeholders::bytes_transferred));
         }
         else
            close();
      }

      void handle_upstream_read(const boost::system::error_code& error,
                                const size_t& bytes_transferred)
      {
         if (!error)
         {
            async_write(downstream_socket_,
                 boost::asio::buffer(upstream_data_,bytes_transferred),
                 boost::bind(&bridge::handle_downstream_write,
                      shared_from_this(),
                      boost::asio::placeholders::error));
         }
         else
            close();
      }

      void close()
      {
         boost::mutex::scoped_lock lock(mutex_);

         if (downstream_socket_.is_open())
         {
            downstream_socket_.close();
         }

         if (upstream_socket_.is_open())
         {
            upstream_socket_.close();
         }
      }

      socket_type downstream_socket_;
      socket_type upstream_socket_;

      enum { max_data_length = 8192 }; //8KB
      unsigned char downstream_data_[max_data_length];
      unsigned char upstream_data_[max_data_length];

      boost::mutex mutex_;

   public:

      class acceptor
      {
      public:

         acceptor(boost::asio::io_service& io_service,
                  const std::string& local_host, unsigned short local_port,
                  const std::string& upstream_host, unsigned short upstream_port)
         : io_service_(io_service),
           localhost_address(boost::asio::ip::address_v4::from_string(local_host)),
           acceptor_(io_service_,ip::tcp::endpoint(localhost_address,local_port)),
           upstream_port_(upstream_port),
           upstream_host_(upstream_host)
         {}

         bool accept_connections()
         {
            try
            {
               session_ = boost::shared_ptr<bridge>(new bridge(io_service_));

               acceptor_.async_accept(session_->downstream_socket(),
                    boost::bind(&acceptor::handle_accept,
                         this,
                         boost::asio::placeholders::error));
            }
            catch(std::exception& e)
            {
               std::cerr << "acceptor exception: " << e.what() << std::endl;
               return false;
            }

            return true;
         }

      private:

         void handle_accept(const boost::system::error_code& error)
         {
            if (!error)
            {
               session_->start(upstream_host_,upstream_port_);

               if (!accept_connections())
               {
                  std::cerr << "Failure during call to accept." << std::endl;
               }
            }
            else
            {
               std::cerr << "Error: " << error.message() << std::endl;
            }
         }

         boost::asio::io_service& io_service_;
         ip::address_v4 localhost_address;
         ip::tcp::acceptor acceptor_;
         ptr_type session_;
         unsigned short upstream_port_;
         std::string upstream_host_;
      };

   };
}

int main(int argc, char* argv[])
{
   if (argc != 5)
   {
      std::cerr << "usage: tcpproxy_server <local host ip> <local port> <forward host ip> <forward port>" << std::endl;
      return 1;
   }

   const unsigned short local_port   = static_cast<unsigned short>(::atoi(argv[2]));
   const unsigned short forward_port = static_cast<unsigned short>(::atoi(argv[4]));
   const std::string local_host      = argv[1];
   const std::string forward_host    = argv[3];

   boost::asio::io_service ios;

   try
   {
      tcp_proxy::bridge::acceptor acceptor(ios,
                                           local_host, local_port,
                                           forward_host, forward_port);

      acceptor.accept_connections();

      ios.run();
   }
   catch(std::exception& e)
   {
      std::cerr << "Error: " << e.what() << std::endl;
      return 1;
   }

   return 0;
}

实际上，此示例代码需要将本地主机和本地端口以及转发端口和转发主机作为参数。

我想编辑此代码以便自动获取在浏览器中询问的主机...

根据我的研究，我必须使用 remote_endpoint() 属性。问题是我不知道如何实现它以便 "trigger" 这个函数每次使用时在浏览器上请求另一个地址...

我试过了：

#include <cstdlib>
#include <cstddef>
#include <iostream>
#include <string>

#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/bind.hpp>
#include <boost/asio.hpp>
#include <boost/thread/mutex.hpp>


namespace tcp_proxy
{
    namespace ip = boost::asio::ip;

    class bridge : public boost::enable_shared_from_this<bridge>
    {
    public:

        typedef ip::tcp::socket socket_type;
        typedef boost::shared_ptr<bridge> ptr_type;

        bridge(boost::asio::io_service& ios)
            : downstream_socket_(ios),
            upstream_socket_(ios)
        {}

        socket_type& downstream_socket()
        {
            return downstream_socket_;
        }

        socket_type& upstream_socket()
        {
            return upstream_socket_;
        }

        void start(const std::string& upstream_host, unsigned short upstream_port)
        {
            upstream_socket_.async_connect(
                ip::tcp::endpoint(
                    boost::asio::ip::address::from_string(upstream_host),
                    upstream_port),
                boost::bind(&bridge::handle_upstream_connect,
                    shared_from_this(),
                    boost::asio::placeholders::error));
        }

        void handle_upstream_connect(const boost::system::error_code& error)
        {
            if (!error)
            {
                upstream_socket_.async_read_some(
                    boost::asio::buffer(upstream_data_, max_data_length),
                    boost::bind(&bridge::handle_upstream_read,
                        shared_from_this(),
                        boost::asio::placeholders::error,
                        boost::asio::placeholders::bytes_transferred));

                downstream_socket_.async_read_some(
                    boost::asio::buffer(downstream_data_, max_data_length),
                    boost::bind(&bridge::handle_downstream_read,
                        shared_from_this(),
                        boost::asio::placeholders::error,
                        boost::asio::placeholders::bytes_transferred));
            }
            else
                close();
        }

    private:

        void handle_downstream_write(const boost::system::error_code& error)
        {
            if (!error)
            {
                upstream_socket_.async_read_some(
                    boost::asio::buffer(upstream_data_, max_data_length),
                    boost::bind(&bridge::handle_upstream_read,
                        shared_from_this(),
                        boost::asio::placeholders::error,
                        boost::asio::placeholders::bytes_transferred));
            }
            else
                close();
        }

        void handle_downstream_read(const boost::system::error_code& error,
            const size_t& bytes_transferred)
        {
            if (!error)
            {
                async_write(upstream_socket_,
                    boost::asio::buffer(downstream_data_, bytes_transferred),
                    boost::bind(&bridge::handle_upstream_write,
                        shared_from_this(),
                        boost::asio::placeholders::error));
            }
            else
                close();
        }

        void handle_upstream_write(const boost::system::error_code& error)
        {
            if (!error)
            {
                downstream_socket_.async_read_some(
                    boost::asio::buffer(downstream_data_, max_data_length),
                    boost::bind(&bridge::handle_downstream_read,
                        shared_from_this(),
                        boost::asio::placeholders::error,
                        boost::asio::placeholders::bytes_transferred));
            }
            else
                close();
        }

        void handle_upstream_read(const boost::system::error_code& error,
            const size_t& bytes_transferred)
        {
            if (!error)
            {
                async_write(downstream_socket_,
                    boost::asio::buffer(upstream_data_, bytes_transferred),
                    boost::bind(&bridge::handle_downstream_write,
                        shared_from_this(),
                        boost::asio::placeholders::error));
            }
            else
                close();
        }

        void close()
        {
            boost::mutex::scoped_lock lock(mutex_);

            if (downstream_socket_.is_open())
            {
                downstream_socket_.close();
            }

            if (upstream_socket_.is_open())
            {
                upstream_socket_.close();
            }
        }

        socket_type downstream_socket_;
        socket_type upstream_socket_;

        enum { max_data_length = 8192 }; //8KB
        unsigned char downstream_data_[max_data_length];
        unsigned char upstream_data_[max_data_length];

        boost::mutex mutex_;

    public:

        class acceptor
        {
        public:

            acceptor(boost::asio::io_service& io_service,
                const std::string& local_host, unsigned short local_port,
                const std::string& upstream_host, unsigned short upstream_port)
                : io_service_(io_service),
                localhost_address(boost::asio::ip::address_v4::from_string(local_host)),
                acceptor_(io_service_, ip::tcp::endpoint(localhost_address, local_port)),
                upstream_port_(upstream_port),
                upstream_host_(upstream_host)
            {}

            bool accept_connections()
            {
                try
                {
                    session_ = boost::shared_ptr<bridge>(new bridge(io_service_));

                    acceptor_.async_accept(session_->downstream_socket(),
                        boost::bind(&acceptor::handle_accept,
                            this,
                            boost::asio::placeholders::error));
                }
                catch (std::exception& e)
                {
                    std::cerr << "acceptor exception: " << e.what() << std::endl;
                    return false;
                }

                return true;
            }

        private:

            void handle_accept(const boost::system::error_code& error)
            {
                if (!error)
                {
                    session_->start(upstream_host_, upstream_port_);

                    if (!accept_connections())
                    {
                        std::cerr << "Failure during call to accept." << std::endl;
                    }
                }
                else
                {
                    std::cerr << "Error: " << error.message() << std::endl;
                }
            }

            boost::asio::io_service& io_service_;
            ip::address_v4 localhost_address;
            ip::tcp::acceptor acceptor_;
            ptr_type session_;
            unsigned short upstream_port_;
            std::string upstream_host_;
        };

    };
}

int main(int argc, char* argv[])
{
    if (argc != 5)
    {
        std::cerr << "usage: EvilProxy.exe <local host ip> <local port> <forward host ip> <forward port>" << std::endl;
        return 1;
    }

    const unsigned short local_port = static_cast<unsigned short>(::atoi(argv[2]));
    const unsigned short forward_port = static_cast<unsigned short>(::atoi(argv[4]));
    const std::string local_host = argv[1];
    const std::string forward_host = argv[3];

    boost::asio::io_service ios;

    boost::system::error_code ec;

    boost::asio::ip::tcp::socket &mySocket = tcp_proxy::bridge(ios).downstream_socket();

    try
    {

        std::string str_IpDest = mySocket.remote_endpoint().address().to_string(); // Here i try to get the adresse but with this code, the adresse is seeking only at the begining...it's too earl

        tcp_proxy::bridge::acceptor acceptor(ios,
            local_host, local_port,
            str_IpDest, forward_port);

        acceptor.accept_connections();

        ios.run();
    }
    catch (std::exception& e)
    {
        std::cerr << "Error: " << e.what() << std::endl;
        return 1;
    }

    return 0;
}

我正在做这个

std::string str_IpDest = mySocket.remote_endpoint().address().to_string();

但是它调用了伯爵，我不知道每次用户询问另一个地址时如何触发它。

我用boost:asio.

任何人都可以帮助我吗？目标...之后是使用 SSL...但是...之后 :)

非常感谢:)

此致

Answer 1

您需要某种协议来在您的浏览器和代理之间进行通信。首先，您的浏览器需要发送类似 "connect to" 的消息，然后如果连接成功，代理应发送信息。我相信 HTTP 有一些特定于代理处理的 headers。

在 cpp (boost::Asio) 中从浏览器检索我的代理的地址

Retrieving adress from browser for my proxy in cpp (boost::Asio)

c++

sockets

proxy

boost

boost-asio