libtorrent-rasterbar-dev 1.0.7-1build1 / usr / include / libtorrent / socks5_stream.hpp

/*

Copyright (c) 2007-2014, Arvid Norberg
All rights reserved.

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modification, are permitted provided that the following conditions
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    * Redistributions of source code must retain the above copyright
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    * Redistributions in binary form must reproduce the above copyright
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      the documentation and/or other materials provided with the distribution.
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

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*/

#ifndef TORRENT_SOCKS5_STREAM_HPP_INCLUDED
#define TORRENT_SOCKS5_STREAM_HPP_INCLUDED

#include <boost/function/function1.hpp>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include "libtorrent/proxy_base.hpp"
#if defined TORRENT_ASIO_DEBUGGING
#include "libtorrent/debug.hpp"
#endif

namespace libtorrent {
namespace socks_error {

	// SOCKS5 error values. If an error_code has the
	// socks error category (get_socks_category()), these
	// are the error values.
	enum socks_error_code
	{
		no_error = 0,
		unsupported_version,
		unsupported_authentication_method,
		unsupported_authentication_version,
		authentication_error,
		username_required,
		general_failure,
		command_not_supported,
		no_identd,
		identd_error,

		num_errors
	};

	// internal
	TORRENT_EXPORT boost::system::error_code make_error_code(socks_error_code e);

} // namespace socks_error

// returns the error_category for SOCKS5 errors
TORRENT_EXPORT boost::system::error_category& get_socks_category();

class socks5_stream : public proxy_base
{
public:

	explicit socks5_stream(io_service& io_service)
		: proxy_base(io_service)
		, m_version(5)
		, m_command(1)
		, m_listen(0)
	{}

	void set_version(int v) { m_version = v; }

	void set_command(int c) { m_command = c; }

	void set_username(std::string const& user
		, std::string const& password)
	{
		m_user = user;
		m_password = password;
	}

	void set_dst_name(std::string const& host)
	{
		m_dst_name = host;
		if (m_dst_name.size() > 255)
			m_dst_name.resize(255);
	}

	void close(error_code& ec)
	{
		m_hostname.clear();
		m_dst_name.clear();
		proxy_base::close(ec);
	}

#ifndef BOOST_NO_EXCEPTIONS
	void close()
	{
		m_hostname.clear();
		m_dst_name.clear();
		proxy_base::close();
	}
#endif

	typedef boost::function<void(error_code const&)> handler_type;

//#error fix error messages to use custom error_code category
//#error add async_connect() that takes a hostname and port as well
	template <class Handler>
	void async_connect(endpoint_type const& endpoint, Handler const& handler)
	{
		m_remote_endpoint = endpoint;

		// the connect is split up in the following steps:
		// 1. resolve name of proxy server
		// 2. connect to proxy server
		// 3. if version == 5:
		//   3.1 send SOCKS5 authentication method message
		//   3.2 read SOCKS5 authentication response
		//   3.3 send username+password
		// 4. send SOCKS command message

		// to avoid unnecessary copying of the handler,
		// store it in a shaed_ptr
		boost::shared_ptr<handler_type> h(new handler_type(handler));

#if defined TORRENT_ASIO_DEBUGGING
		add_outstanding_async("socks5_stream::name_lookup");
#endif
		tcp::resolver::query q(m_hostname, to_string(m_port).elems);
		m_resolver.async_resolve(q, boost::bind(
			&socks5_stream::name_lookup, this, _1, _2, h));
	}

private:

	void name_lookup(error_code const& e, tcp::resolver::iterator i
		, boost::shared_ptr<handler_type> h);
	void connected(error_code const& e, boost::shared_ptr<handler_type> h);
	void handshake1(error_code const& e, boost::shared_ptr<handler_type> h);
	void handshake2(error_code const& e, boost::shared_ptr<handler_type> h);
	void handshake3(error_code const& e, boost::shared_ptr<handler_type> h);
	void handshake4(error_code const& e, boost::shared_ptr<handler_type> h);
	void socks_connect(boost::shared_ptr<handler_type> h);
	void connect1(error_code const& e, boost::shared_ptr<handler_type> h);
	void connect2(error_code const& e, boost::shared_ptr<handler_type> h);
	void connect3(error_code const& e, boost::shared_ptr<handler_type> h);

	// send and receive buffer
	std::vector<char> m_buffer;
	// proxy authentication
	std::string m_user;
	std::string m_password;
	std::string m_dst_name;
	int m_version;
	int m_command;
	// set to one when we're waiting for the
	// second message to accept an incoming connection
	int m_listen;
};

}

#if BOOST_VERSION >= 103500

namespace boost { namespace system {

	template<> struct is_error_code_enum<libtorrent::socks_error::socks_error_code>
	{ static const bool value = true; };

	template<> struct is_error_condition_enum<libtorrent::socks_error::socks_error_code>
	{ static const bool value = true; };
} }

#endif // BOOST_VERSION

#endif