forked from ArashPartow/proxy
/
tcpproxy_server.cpp
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/
tcpproxy_server.cpp
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//
// tcpproxy_server.cpp
// ~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2007 Arash Partow (http://www.partow.net)
// URL: http://www.partow.net/programming/tcpproxy/index.html
//
// Distributed under the Boost Software License, Version 1.0.
//
#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/function.hpp>
#include <boost/asio.hpp>
namespace tcp_proxy
{
namespace ip = boost::asio::ip;
class tcp_bridge : public boost::enable_shared_from_this<tcp_bridge>
{
private:
typedef boost::function <void (const boost::system::error_code&, const size_t& )> handler_type;
typedef ip::tcp::socket socket_type;
public:
typedef tcp_bridge type;
typedef boost::shared_ptr<type> ptr_type;
tcp_bridge(boost::asio::io_service& ios)
: client_socket_(ios),
remote_socket_(ios)
{}
socket_type& socket()
{
return client_socket_;
}
void start(const std::string& remote_host, unsigned short remote_port)
{
remote_socket_.async_connect(
ip::tcp::endpoint(
boost::asio::ip::address::from_string(remote_host),
remote_port),
boost::bind(&type::handle_remote_connect,
shared_from_this(),
boost::asio::placeholders::error));
}
void handle_remote_connect(const boost::system::error_code& error)
{
if (!error)
{
remote_write_ = boost::bind(&type::handle_remote_write,
shared_from_this(),
boost::asio::placeholders::error);
client_write_ = boost::bind(&type::handle_client_write,
shared_from_this(),
boost::asio::placeholders::error);
remote_read_ = boost::bind(&type::handle_remote_read,
shared_from_this(),
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred);
client_read_ = boost::bind(&type::handle_client_read,
shared_from_this(),
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred);
remote_socket_.async_read_some(
boost::asio::buffer(remote_data_, max_data_length),
remote_read_);
client_socket_.async_read_some(
boost::asio::buffer(client_data_, max_data_length),
client_read_);
}
else
close();
}
private:
void handle_client_write(const boost::system::error_code& error)
{
if (!error)
{
remote_socket_.async_read_some(
boost::asio::buffer(remote_data_, max_data_length),
remote_read_);
}
else
close();
}
void handle_client_read(const boost::system::error_code& error,
const size_t& bytes_transferred)
{
if (!error)
{
async_write(remote_socket_,
boost::asio::buffer(client_data_,bytes_transferred),
remote_write_);
}
else
close();
}
void handle_remote_write(const boost::system::error_code& error)
{
if (!error)
{
client_socket_.async_read_some(
boost::asio::buffer(client_data_, max_data_length),
client_read_);
}
else
close();
}
void handle_remote_read(const boost::system::error_code& error,
const size_t& bytes_transferred)
{
if (!error)
{
async_write(client_socket_,
boost::asio::buffer(remote_data_, bytes_transferred),
client_write_);
}
else
close();
}
void close()
{
if (client_socket_.is_open()) client_socket_.close();
if (remote_socket_.is_open()) remote_socket_.close();
}
socket_type client_socket_;
socket_type remote_socket_;
enum { max_data_length = 4096 };
char client_data_[max_data_length];
char remote_data_[max_data_length];
handler_type client_write_;
handler_type remote_write_;
handler_type client_read_;
handler_type remote_read_;
public:
static inline ptr_type create(boost::asio::io_service& ios)
{
return ptr_type(new type(ios));
}
class acceptor
{
private:
typedef boost::function<void (const boost::system::error_code&)> handler_type;
public:
acceptor(boost::asio::io_service& ios,
unsigned short local_port,
unsigned short remote_port,
const std::string& local_host,
const std::string& remote_host)
: io_service_(ios),
localhost_address(boost::asio::ip::address_v4::from_string(local_host)),
acceptor_(ios,ip::tcp::endpoint(localhost_address,local_port)),
remote_port_(remote_port),
remote_host_(remote_host)
{}
bool accept_connections()
{
try
{
session_ = type::create(io_service_);
acceptor_.async_accept(session_->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(remote_host_,remote_port_);
if (!accept_connections())
{
std::cerr << "Failed to accept." << std::endl;
}
}
else
{
std::cerr << error.message() << std::endl;
}
}
boost::asio::io_service& io_service_;
ip::address_v4 localhost_address;
ip::tcp::acceptor acceptor_;
ptr_type session_;
handler_type handle_;
unsigned short remote_port_;
std::string remote_host_;
};
};
}
int main(int argc, char* argv[])
{
if (argc != 5)
{
std::cerr << "usage: tcpproxy_server <local host ip> <local port> <remote host ip> <remote port>" << std::endl;
return 1;
}
const unsigned short local_port = static_cast<unsigned short>(::atoi(argv[2]));
const unsigned short remote_port = static_cast<unsigned short>(::atoi(argv[4]));
const std::string local_host = argv[1];
const std::string remote_host = argv[3];
boost::asio::io_service ios;
try
{
tcp_proxy::tcp_bridge::acceptor acceptor(ios,
local_port,remote_port,
local_host,remote_host);
acceptor.accept_connections();
ios.run();
}
catch(std::exception& e)
{
std::cerr << e.what() << std::endl;
return 1;
}
return 0;
}
/*
* Note: build command:
* c++ -pedantic -ansi -Wall -Werror -O3 -o tcpproxy_server tcpproxy_server.cpp -L/usr/lib -lstdc++ -lpthread -lboost_thread -lboost_system
*/