420 lines
12 KiB
C++
420 lines
12 KiB
C++
/*
|
|
|
|
Copyright (c) 2009, Arvid Norberg
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the distribution.
|
|
* Neither the name of the author nor the names of its
|
|
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
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#ifndef TORRENT_UTP_STREAM_HPP_INCLUDED
|
|
#define TORRENT_UTP_STREAM_HPP_INCLUDED
|
|
|
|
#include "libtorrent/connection_queue.hpp"
|
|
#include "libtorrent/proxy_base.hpp"
|
|
#include "libtorrent/udp_socket.hpp"
|
|
#include "libtorrent/io.hpp"
|
|
#include "libtorrent/packet_buffer.hpp"
|
|
#include "libtorrent/error_code.hpp"
|
|
|
|
#include <boost/bind.hpp>
|
|
#include <boost/function/function1.hpp>
|
|
#include <boost/function/function2.hpp>
|
|
|
|
#ifndef BOOST_NO_EXCEPTIONS
|
|
#include <boost/system/system_error.hpp>
|
|
#endif
|
|
|
|
#define CCONTROL_TARGET 100
|
|
|
|
namespace libtorrent
|
|
{
|
|
struct utp_socket_manager;
|
|
|
|
// some MTU and protocol header sizes constants
|
|
enum
|
|
{
|
|
TORRENT_IPV4_HEADER = 20,
|
|
TORRENT_IPV6_HEADER = 40,
|
|
TORRENT_UDP_HEADER = 8,
|
|
TORRENT_SOCKS5_HEADER = 6, // plus the size of the destination address
|
|
|
|
TORRENT_ETHERNET_MTU = 1500,
|
|
TORRENT_TEREDO_MTU = 1280,
|
|
TORRENT_INET_MIN_MTU = 576,
|
|
TORRENT_INET_MAX_MTU = 0xffff
|
|
};
|
|
|
|
// the point of the bif_endian_int is two-fold
|
|
// one purpuse is to not have any alignment requirements
|
|
// so that any byffer received from the network can be cast
|
|
// to it and read as an integer of various sizes without
|
|
// triggering a bus error. The other purpose is to convert
|
|
// from network byte order to host byte order when read and
|
|
// written, to offer a convenient interface to both interpreting
|
|
// and writing network packets
|
|
template <class T> struct big_endian_int
|
|
{
|
|
big_endian_int& operator=(T v)
|
|
{
|
|
char* p = m_storage;
|
|
detail::write_impl(v, p);
|
|
return *this;
|
|
}
|
|
operator T() const
|
|
{
|
|
const char* p = m_storage;
|
|
return detail::read_impl(p, detail::type<T>());
|
|
}
|
|
private:
|
|
char m_storage[sizeof(T)];
|
|
};
|
|
|
|
typedef big_endian_int<boost::uint64_t> be_uint64;
|
|
typedef big_endian_int<boost::uint32_t> be_uint32;
|
|
typedef big_endian_int<boost::uint16_t> be_uint16;
|
|
typedef big_endian_int<boost::int64_t> be_int64;
|
|
typedef big_endian_int<boost::int32_t> be_int32;
|
|
typedef big_endian_int<boost::int16_t> be_int16;
|
|
|
|
/*
|
|
uTP header from BEP 29
|
|
|
|
0 4 8 16 24 32
|
|
+-------+-------+---------------+---------------+---------------+
|
|
| type | ver | extension | connection_id |
|
|
+-------+-------+---------------+---------------+---------------+
|
|
| timestamp_microseconds |
|
|
+---------------+---------------+---------------+---------------+
|
|
| timestamp_difference_microseconds |
|
|
+---------------+---------------+---------------+---------------+
|
|
| wnd_size |
|
|
+---------------+---------------+---------------+---------------+
|
|
| seq_nr | ack_nr |
|
|
+---------------+---------------+---------------+---------------+
|
|
|
|
*/
|
|
|
|
enum type { ST_DATA = 0, ST_FIN, ST_STATE, ST_RESET, ST_SYN, NUM_TYPES };
|
|
|
|
struct utp_header
|
|
{
|
|
unsigned char type_ver;
|
|
unsigned char extension;
|
|
be_uint16 connection_id;
|
|
be_uint32 timestamp_microseconds;
|
|
be_uint32 timestamp_difference_microseconds;
|
|
be_uint32 wnd_size;
|
|
be_uint16 seq_nr;
|
|
be_uint16 ack_nr;
|
|
|
|
int get_type() const { return type_ver >> 4; }
|
|
int get_version() const { return type_ver & 0xf; }
|
|
};
|
|
|
|
struct utp_socket_impl;
|
|
|
|
utp_socket_impl* construct_utp_impl(boost::uint16_t recv_id
|
|
, boost::uint16_t send_id, void* userdata
|
|
, utp_socket_manager* sm);
|
|
void detach_utp_impl(utp_socket_impl* s);
|
|
void delete_utp_impl(utp_socket_impl* s);
|
|
bool should_delete(utp_socket_impl* s);
|
|
void tick_utp_impl(utp_socket_impl* s, ptime const& now);
|
|
void utp_init_mtu(utp_socket_impl* s, int link_mtu, int utp_mtu);
|
|
bool utp_incoming_packet(utp_socket_impl* s, char const* p
|
|
, int size, udp::endpoint const& ep, ptime receive_time);
|
|
bool utp_match(utp_socket_impl* s, udp::endpoint const& ep, boost::uint16_t id);
|
|
udp::endpoint utp_remote_endpoint(utp_socket_impl* s);
|
|
boost::uint16_t utp_receive_id(utp_socket_impl* s);
|
|
int utp_socket_state(utp_socket_impl const* s);
|
|
void utp_send_ack(utp_socket_impl* s);
|
|
void utp_writable(utp_socket_impl* s);
|
|
|
|
#if defined TORRENT_VERBOSE_LOGGING || defined TORRENT_LOGGING || defined TORRENT_ERROR_LOGGING
|
|
int socket_impl_size();
|
|
#endif
|
|
|
|
// this is the user-level stream interface to utp sockets.
|
|
// the reason why it's split up in a utp_stream class and
|
|
// an implementation class is because the socket state has
|
|
// to be able to out-live the user level socket. For instance
|
|
// when sending data on a stream and then closing it, the
|
|
// state holding the send buffer has to be kept around until
|
|
// it has been flushed, which may be longer than the client
|
|
// will keep the utp_stream object around for.
|
|
// for more details, see utp_socket_impl, which is analogous
|
|
// to the kernel state for a socket. It's defined in utp_stream.cpp
|
|
class TORRENT_EXTRA_EXPORT utp_stream
|
|
{
|
|
public:
|
|
|
|
typedef utp_stream lowest_layer_type;
|
|
typedef stream_socket::endpoint_type endpoint_type;
|
|
typedef stream_socket::protocol_type protocol_type;
|
|
|
|
explicit utp_stream(asio::io_service& io_service);
|
|
~utp_stream();
|
|
|
|
lowest_layer_type& lowest_layer() { return *this; }
|
|
|
|
// used for incoming connections
|
|
void set_impl(utp_socket_impl* s);
|
|
utp_socket_impl* get_impl();
|
|
|
|
#ifndef BOOST_NO_EXCEPTIONS
|
|
template <class IO_Control_Command>
|
|
void io_control(IO_Control_Command& ioc) {}
|
|
#endif
|
|
|
|
template <class IO_Control_Command>
|
|
void io_control(IO_Control_Command& ioc, error_code& ec) {}
|
|
|
|
#ifndef BOOST_NO_EXCEPTIONS
|
|
void bind(endpoint_type const& /*endpoint*/) {}
|
|
#endif
|
|
|
|
void bind(endpoint_type const& endpoint, error_code& ec);
|
|
|
|
#ifndef BOOST_NO_EXCEPTIONS
|
|
template <class SettableSocketOption>
|
|
void set_option(SettableSocketOption const& opt) {}
|
|
#endif
|
|
|
|
template <class SettableSocketOption>
|
|
error_code set_option(SettableSocketOption const& opt, error_code& ec) { return ec; }
|
|
|
|
void close();
|
|
void close(error_code const& /*ec*/) { close(); }
|
|
bool is_open() const { return m_open; }
|
|
|
|
int read_buffer_size() const;
|
|
static void on_read(void* self, size_t bytes_transferred, error_code const& ec, bool kill);
|
|
static void on_write(void* self, size_t bytes_transferred, error_code const& ec, bool kill);
|
|
static void on_connect(void* self, error_code const& ec, bool kill);
|
|
|
|
typedef void(*handler_t)(void*, size_t, error_code const&, bool);
|
|
typedef void(*connect_handler_t)(void*, error_code const&, bool);
|
|
|
|
void add_read_buffer(void* buf, size_t len);
|
|
void set_read_handler(handler_t h);
|
|
void add_write_buffer(void const* buf, size_t len);
|
|
void set_write_handler(handler_t h);
|
|
size_t read_some(bool clear_buffers);
|
|
|
|
int send_delay() const;
|
|
int recv_delay() const;
|
|
|
|
void do_connect(tcp::endpoint const& ep, connect_handler_t h);
|
|
|
|
endpoint_type local_endpoint() const
|
|
{
|
|
error_code ec;
|
|
return local_endpoint(ec);
|
|
}
|
|
|
|
endpoint_type local_endpoint(error_code& ec) const;
|
|
|
|
endpoint_type remote_endpoint() const
|
|
{
|
|
error_code ec;
|
|
return remote_endpoint(ec);
|
|
}
|
|
|
|
endpoint_type remote_endpoint(error_code& ec) const;
|
|
|
|
std::size_t available() const;
|
|
std::size_t available(error_code& /*ec*/) const { return available(); }
|
|
|
|
asio::io_service& get_io_service() { return m_io_service; }
|
|
|
|
template <class Handler>
|
|
void async_connect(endpoint_type const& endpoint, Handler const& handler)
|
|
{
|
|
if (!endpoint.address().is_v4())
|
|
{
|
|
m_io_service.post(boost::bind<void>(handler, asio::error::operation_not_supported, 0));
|
|
return;
|
|
}
|
|
|
|
if (m_impl == 0)
|
|
{
|
|
m_io_service.post(boost::bind<void>(handler, asio::error::not_connected, 0));
|
|
return;
|
|
}
|
|
|
|
m_connect_handler = handler;
|
|
do_connect(endpoint, &utp_stream::on_connect);
|
|
}
|
|
|
|
template <class Mutable_Buffers, class Handler>
|
|
void async_read_some(Mutable_Buffers const& buffers, Handler const& handler)
|
|
{
|
|
if (m_impl == 0)
|
|
{
|
|
m_io_service.post(boost::bind<void>(handler, asio::error::not_connected, 0));
|
|
return;
|
|
}
|
|
|
|
TORRENT_ASSERT(!m_read_handler);
|
|
if (m_read_handler)
|
|
{
|
|
m_io_service.post(boost::bind<void>(handler, asio::error::operation_not_supported, 0));
|
|
return;
|
|
}
|
|
for (typename Mutable_Buffers::const_iterator i = buffers.begin()
|
|
, end(buffers.end()); i != end; ++i)
|
|
{
|
|
TORRENT_ASSERT(buffer_size(*i) > 0);
|
|
using asio::buffer_cast;
|
|
using asio::buffer_size;
|
|
add_read_buffer(buffer_cast<void*>(*i), buffer_size(*i));
|
|
}
|
|
m_read_handler = handler;
|
|
set_read_handler(&utp_stream::on_read);
|
|
}
|
|
|
|
void do_async_connect(endpoint_type const& ep
|
|
, boost::function<void(error_code const&)> const& handler);
|
|
|
|
template <class Protocol>
|
|
void open(Protocol const& p, error_code& ec)
|
|
{ m_open = true; }
|
|
|
|
template <class Protocol>
|
|
void open(Protocol const& p)
|
|
{ m_open = true; }
|
|
|
|
template <class Mutable_Buffers>
|
|
std::size_t read_some(Mutable_Buffers const& buffers, error_code& ec)
|
|
{
|
|
TORRENT_ASSERT(!m_read_handler);
|
|
if (m_impl == 0)
|
|
{
|
|
ec = asio::error::not_connected;
|
|
return 0;
|
|
}
|
|
|
|
if (read_buffer_size() == 0)
|
|
{
|
|
ec = asio::error::would_block;
|
|
return 0;
|
|
}
|
|
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
|
|
size_t buf_size = 0;
|
|
#endif
|
|
|
|
for (typename Mutable_Buffers::const_iterator i = buffers.begin()
|
|
, end(buffers.end()); i != end; ++i)
|
|
{
|
|
using asio::buffer_cast;
|
|
using asio::buffer_size;
|
|
add_read_buffer(buffer_cast<void*>(*i), buffer_size(*i));
|
|
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
|
|
buf_size += buffer_size(*i);
|
|
#endif
|
|
}
|
|
std::size_t ret = read_some(true);
|
|
TORRENT_ASSERT(ret <= buf_size);
|
|
TORRENT_ASSERT(ret > 0);
|
|
return ret;
|
|
}
|
|
|
|
template <class Const_Buffers>
|
|
std::size_t write_some(Const_Buffers const& buffers, error_code& ec)
|
|
{
|
|
TORRENT_ASSERT(false && "not implemented!");
|
|
// TODO: implement
|
|
return 0;
|
|
}
|
|
|
|
#ifndef BOOST_NO_EXCEPTIONS
|
|
template <class Mutable_Buffers>
|
|
std::size_t read_some(Mutable_Buffers const& buffers)
|
|
{
|
|
error_code ec;
|
|
std::size_t ret = read_some(buffers, ec);
|
|
if (ec)
|
|
boost::throw_exception(boost::system::system_error(ec));
|
|
return ret;
|
|
}
|
|
|
|
template <class Const_Buffers>
|
|
std::size_t write_some(Const_Buffers const& buffers)
|
|
{
|
|
error_code ec;
|
|
std::size_t ret = write_some(buffers, ec);
|
|
if (ec)
|
|
boost::throw_exception(boost::system::system_error(ec));
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
template <class Const_Buffers, class Handler>
|
|
void async_write_some(Const_Buffers const& buffers, Handler const& handler)
|
|
{
|
|
if (m_impl == 0)
|
|
{
|
|
m_io_service.post(boost::bind<void>(handler, asio::error::not_connected, 0));
|
|
return;
|
|
}
|
|
|
|
TORRENT_ASSERT(!m_write_handler);
|
|
if (m_write_handler)
|
|
{
|
|
m_io_service.post(boost::bind<void>(handler, asio::error::operation_not_supported, 0));
|
|
return;
|
|
}
|
|
|
|
for (typename Const_Buffers::const_iterator i = buffers.begin()
|
|
, end(buffers.end()); i != end; ++i)
|
|
{
|
|
TORRENT_ASSERT(buffer_size(*i) > 0);
|
|
using asio::buffer_cast;
|
|
using asio::buffer_size;
|
|
add_write_buffer((void*)buffer_cast<void const*>(*i), buffer_size(*i));
|
|
}
|
|
m_write_handler = handler;
|
|
set_write_handler(&utp_stream::on_write);
|
|
}
|
|
|
|
//private:
|
|
|
|
void cancel_handlers(error_code const&);
|
|
|
|
boost::function1<void, error_code const&> m_connect_handler;
|
|
boost::function2<void, error_code const&, std::size_t> m_read_handler;
|
|
boost::function2<void, error_code const&, std::size_t> m_write_handler;
|
|
|
|
asio::io_service& m_io_service;
|
|
utp_socket_impl* m_impl;
|
|
bool m_open;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|