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//
// socks4.hpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef SOCKS4_HPP
#define SOCKS4_HPP
#include <string>
#include <boost/asio.hpp>
#include <boost/array.hpp>
namespace socks4 {
const unsigned char version = 0x04;
class request
{
public:
enum command_type
{
connect = 0x01,
bind = 0x02
};
request(command_type cmd, const boost::asio::ip::tcp::endpoint& endpoint,
const std::string& user_id)
: version_(version),
command_(cmd),
user_id_(user_id),
null_byte_(0)
{
// Only IPv4 is supported by the SOCKS 4 protocol.
if (endpoint.protocol() != boost::asio::ip::tcp::v4())
{
throw boost::system::system_error(
boost::asio::error::address_family_not_supported);
}
// Convert port number to network byte order.
unsigned short port = endpoint.port();
port_high_byte_ = (port >> 8) & 0xff;
port_low_byte_ = port & 0xff;
// Save IP address in network byte order.
address_ = endpoint.address().to_v4().to_bytes();
}
boost::array<boost::asio::const_buffer, 7> buffers() const
{
boost::array<boost::asio::const_buffer, 7> bufs =
{
{
boost::asio::buffer(&version_, 1),
boost::asio::buffer(&command_, 1),
boost::asio::buffer(&port_high_byte_, 1),
boost::asio::buffer(&port_low_byte_, 1),
boost::asio::buffer(address_),
boost::asio::buffer(user_id_),
boost::asio::buffer(&null_byte_, 1)
}
};
return bufs;
}
private:
unsigned char version_;
unsigned char command_;
unsigned char port_high_byte_;
unsigned char port_low_byte_;
boost::asio::ip::address_v4::bytes_type address_;
std::string user_id_;
unsigned char null_byte_;
};
class reply
{
public:
enum status_type
{
request_granted = 0x5a,
request_failed = 0x5b,
request_failed_no_identd = 0x5c,
request_failed_bad_user_id = 0x5d
};
reply()
: null_byte_(0),
status_()
{
}
boost::array<boost::asio::mutable_buffer, 5> buffers()
{
boost::array<boost::asio::mutable_buffer, 5> bufs =
{
{
boost::asio::buffer(&null_byte_, 1),
boost::asio::buffer(&status_, 1),
boost::asio::buffer(&port_high_byte_, 1),
boost::asio::buffer(&port_low_byte_, 1),
boost::asio::buffer(address_)
}
};
return bufs;
}
bool success() const
{
return null_byte_ == 0 && status_ == request_granted;
}
unsigned char status() const
{
return status_;
}
boost::asio::ip::tcp::endpoint endpoint() const
{
unsigned short port = port_high_byte_;
port = (port << 8) & 0xff00;
port = port | port_low_byte_;
boost::asio::ip::address_v4 address(address_);
return boost::asio::ip::tcp::endpoint(address, port);
}
private:
unsigned char null_byte_;
unsigned char status_;
unsigned char port_high_byte_;
unsigned char port_low_byte_;
boost::asio::ip::address_v4::bytes_type address_;
};
} // namespace socks4
#endif // SOCKS4_HPP
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