libtorrent-rasterbar-dev 1.0.7-1build1 / usr / include / libtorrent / i2p_stream.hpp

/*

Copyright (c) 2009-2014, 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.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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*/

#ifndef TORRENT_I2P_STREAM_HPP_INCLUDED
#define TORRENT_I2P_STREAM_HPP_INCLUDED

#include "libtorrent/config.hpp"

#if TORRENT_USE_I2P

#include <list>
#include <string>
#include <vector>
#include <boost/function/function1.hpp>
#include <boost/function/function2.hpp>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include "libtorrent/proxy_base.hpp"
#include "libtorrent/session_settings.hpp"

namespace libtorrent {

	namespace i2p_error {

		// error values for the i2p_category error_category.
		enum i2p_error_code
		{
			no_error = 0,
			parse_failed,
			cant_reach_peer,
			i2p_error,
			invalid_key,
			invalid_id,
			timeout,
			key_not_found,
			duplicated_id,
			num_errors
		};

		// hidden
		TORRENT_EXPORT boost::system::error_code make_error_code(i2p_error_code e);
	}

	// returns the error category for I2P errors
	TORRENT_EXPORT boost::system::error_category& get_i2p_category();

class i2p_stream : public proxy_base
{
public:

	explicit i2p_stream(io_service& io_service);
	~i2p_stream();

	enum command_t
	{
		cmd_none,
		cmd_create_session,
		cmd_connect,
		cmd_accept,
		cmd_name_lookup,
		cmd_incoming
	};

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

	void set_session_id(char const* id) { m_id = id; }

	void set_destination(std::string const& d) { m_dest = d; }
	std::string const& destination() { return m_dest; }

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

	template <class Handler>
	void async_connect(endpoint_type const& endpoint, Handler const& handler)
	{
		// since we don't support regular endpoints, just ignore the one
		// provided and use m_dest.

		// the connect is split up in the following steps:
		// 1. resolve name of proxy server
		// 2. connect to SAM bridge
		// 4 send command message (CONNECT/ACCEPT)

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

		tcp::resolver::query q(m_hostname, to_string(m_port).elems);
		m_resolver.async_resolve(q, boost::bind(
			&i2p_stream::do_connect, this, _1, _2, h));
	}

	std::string name_lookup() const { return m_name_lookup; }
	void set_name_lookup(char const* name) { m_name_lookup = name; }

	void send_name_lookup(boost::shared_ptr<handler_type> h);

private:

	bool handle_error(error_code const& e, boost::shared_ptr<handler_type> const& h);
	void do_connect(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 start_read_line(error_code const& e, boost::shared_ptr<handler_type> h);
	void read_line(error_code const& e, boost::shared_ptr<handler_type> h);
	void send_connect(boost::shared_ptr<handler_type> h);
	void send_accept(boost::shared_ptr<handler_type> h);
	void send_session_create(boost::shared_ptr<handler_type> h);

	// send and receive buffer
	std::vector<char> m_buffer;
	char const* m_id;
	int m_command; // 0 = connect, 1 = accept
	std::string m_dest;
	std::string m_name_lookup;

	enum state_t
	{
		read_hello_response,
		read_connect_response,
		read_accept_response,
		read_session_create_response,
		read_name_lookup_response
	};

	int m_state;
#if TORRENT_USE_ASSERTS
	int m_magic;
#endif
};

class i2p_connection
{
public:
	i2p_connection(io_service& ios);
	~i2p_connection();

	proxy_settings const& proxy() const { return m_sam_router; }

	bool is_open() const
	{
		return m_sam_socket
			&& m_sam_socket->is_open()
			&& m_state != sam_connecting;
	}
	void open(proxy_settings const& s, i2p_stream::handler_type const& h);
	void close(error_code&);

	char const* session_id() const { return m_session_id.c_str(); }
	std::string const& local_endpoint() const { return m_i2p_local_endpoint; }

	typedef boost::function<void(error_code const&, char const*)> name_lookup_handler;
	void async_name_lookup(char const* name, name_lookup_handler handler);

private:

	void on_sam_connect(error_code const& ec, i2p_stream::handler_type const& h
		, boost::shared_ptr<i2p_stream>);
	void do_name_lookup(std::string const& name
		, name_lookup_handler const& h);
	void on_name_lookup(error_code const& ec
		, name_lookup_handler handler
		, boost::shared_ptr<i2p_stream>);

	void set_local_endpoint(error_code const& ec, char const* dest
		, i2p_stream::handler_type const& h);

	// to talk to i2p SAM bridge
	boost::shared_ptr<i2p_stream> m_sam_socket;
	proxy_settings m_sam_router;

	// our i2p endpoint key
	std::string m_i2p_local_endpoint;
	std::string m_session_id;

	std::list<std::pair<std::string, name_lookup_handler> > m_name_lookup;

	enum state_t
	{
		sam_connecting,
		sam_name_lookup,
		sam_idle
	};

	state_t m_state;

	io_service& m_io_service;
};

}

#if BOOST_VERSION >= 103500
namespace boost { namespace system {

template<>
struct is_error_code_enum<libtorrent::i2p_error::i2p_error_code>
{ static const bool value = true; };

template<>
struct is_error_condition_enum<libtorrent::i2p_error::i2p_error_code>
{ static const bool value = true; };

} }
#endif // BOOST_VERSION

#endif // TORRENT_USE_I2P

#endif