libtorrent-rasterbar-dev 1.1.1-1+b1 / usr / include / libtorrent / socks5_stream.hpp

/*

Copyright (c) 2007-2016, Arvid Norberg
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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 "libtorrent/aux_/disable_warnings_push.hpp"

#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/make_shared.hpp>

#include "libtorrent/aux_/disable_warnings_pop.hpp"

#include "libtorrent/proxy_base.hpp"
#include "libtorrent/broadcast_socket.hpp" // for is_ip_address
#include "libtorrent/assert.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:

	// commands
	enum {
		socks5_connect = 1,
		socks5_bind = 2,
		socks5_udp_associate = 3
	};

	explicit socks5_stream(io_service& io_service)
		: proxy_base(io_service)
		, m_version(5)
		, m_command(socks5_connect)
		, m_listen(0)
	{}

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

	void set_command(int c)
	{
		TORRENT_ASSERT(c >= socks5_connect && c <= socks5_udp_associate);
		m_command = c;
	}

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

	template <typename Handler>
	void async_accept(Handler const& handler)
	{
		TORRENT_ASSERT(m_listen == 1);
		TORRENT_ASSERT(m_command == socks5_bind);

		// to avoid unnecessary copying of the handler,
		// store it in a shaed_ptr
		error_code e;
#if defined TORRENT_ASIO_DEBUGGING
		add_outstanding_async("socks5_stream::connect1");
#endif
		connect1(e, boost::make_shared<handler_type>(handler));
	}

	template <typename Handler>
	void async_listen(tcp::endpoint const& ep, Handler const& handler)
	{
		m_command = socks5_bind;

		m_remote_endpoint = ep;

		// 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));
	}

	void set_dst_name(std::string const& host)
	{
		// if this assert trips, set_dst_name() is called wth an IP address rather
		// than a hostname. Instead, resolve the IP into an address and pass it to
		// async_connect instead
		TORRENT_ASSERT(!is_ip_address(host.c_str()));
		m_dst_name = host;
		if (m_dst_name.size() > 255)
			m_dst_name.resize(255);
	}

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

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

#ifndef BOOST_NO_EXCEPTIONS
	endpoint_type local_endpoint() const
	{
		return m_local_endpoint;
	}
#endif

	endpoint_type local_endpoint(error_code&) const
	{
		return m_local_endpoint;
	}


	// TODO: 2 add async_connect() that takes a hostname and port as well
	template <class Handler>
	void async_connect(endpoint_type const& endpoint, Handler const& handler)
	{
		// make sure we don't try to connect to INADDR_ANY. binding is fine,
		// and using a hostname is fine on SOCKS version 5.
		TORRENT_ASSERT(m_command != socks5_bind);
		TORRENT_ASSERT(endpoint.address() != address()
			|| (!m_dst_name.empty() && m_version == 5));

		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;

	// when listening via a socks proxy, this is the IP and port our listen
	// socket bound to
	endpoint_type m_local_endpoint;

	int m_version;

	// the socks command to send for this connection (connect, bind,
	// udp associate)
	int m_command;

	// set to one when we're waiting for the
	// second message to accept an incoming connection
	int m_listen;
};

}

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