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premiere-libtorrent/src/bt_peer_connection.cpp

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/*
Copyright (c) 2003, 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.
*/
#include <vector>
#include <iostream>
#include <iomanip>
#include <limits>
#include <boost/bind.hpp>
#include "libtorrent/bt_peer_connection.hpp"
#include "libtorrent/session.hpp"
#include "libtorrent/identify_client.hpp"
#include "libtorrent/entry.hpp"
#include "libtorrent/bencode.hpp"
#include "libtorrent/alert_types.hpp"
#include "libtorrent/invariant_check.hpp"
#include "libtorrent/io.hpp"
#include "libtorrent/version.hpp"
#include "libtorrent/extensions.hpp"
#include "libtorrent/aux_/session_impl.hpp"
using namespace boost::posix_time;
using boost::bind;
using boost::shared_ptr;
using libtorrent::aux::session_impl;
namespace libtorrent
{
const bt_peer_connection::message_handler
bt_peer_connection::m_message_handler[] =
{
&bt_peer_connection::on_choke,
&bt_peer_connection::on_unchoke,
&bt_peer_connection::on_interested,
&bt_peer_connection::on_not_interested,
&bt_peer_connection::on_have,
&bt_peer_connection::on_bitfield,
&bt_peer_connection::on_request,
&bt_peer_connection::on_piece,
&bt_peer_connection::on_cancel,
&bt_peer_connection::on_dht_port,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
&bt_peer_connection::on_extended
};
bt_peer_connection::bt_peer_connection(
session_impl& ses
, boost::weak_ptr<torrent> tor
, shared_ptr<stream_socket> s
, tcp::endpoint const& remote)
: peer_connection(ses, tor, s, remote)
, m_state(read_protocol_length)
#ifndef TORRENT_DISABLE_EXTENSIONS
, m_supports_extensions(false)
#endif
, m_supports_dht_port(false)
#ifndef NDEBUG
, m_sent_bitfield(false)
, m_in_constructor(true)
#endif
{
#ifdef TORRENT_VERBOSE_LOGGING
(*m_logger) << "*** bt_peer_connection\n";
#endif
write_handshake();
// start in the state where we are trying to read the
// handshake from the other side
reset_recv_buffer(1);
// assume the other end has no pieces
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
if (t->ready_for_connections())
write_bitfield(t->pieces());
setup_send();
setup_receive();
#ifndef NDEBUG
m_in_constructor = false;
#endif
}
bt_peer_connection::bt_peer_connection(
session_impl& ses
, boost::shared_ptr<stream_socket> s)
: peer_connection(ses, s)
, m_state(read_protocol_length)
#ifndef TORRENT_DISABLE_EXTENSIONS
, m_supports_extensions(false)
#endif
, m_supports_dht_port(false)
#ifndef NDEBUG
, m_sent_bitfield(false)
, m_in_constructor(true)
#endif
{
// we are not attached to any torrent yet.
// we have to wait for the handshake to see
// which torrent the connector want's to connect to
// start in the state where we are trying to read the
// handshake from the other side
reset_recv_buffer(1);
setup_receive();
#ifndef NDEBUG
m_in_constructor = false;
#endif
}
bt_peer_connection::~bt_peer_connection()
{
}
void bt_peer_connection::on_metadata()
{
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
write_bitfield(t->pieces());
}
void bt_peer_connection::write_dht_port(int listen_port)
{
INVARIANT_CHECK;
buffer::interval packet = allocate_send_buffer(7);
detail::write_uint32(3, packet.begin);
detail::write_uint8(msg_dht_port, packet.begin);
detail::write_uint16(listen_port, packet.begin);
assert(packet.begin == packet.end);
setup_send();
}
void bt_peer_connection::get_peer_info(peer_info& p) const
{
assert(!associated_torrent().expired());
p.down_speed = statistics().download_rate();
p.up_speed = statistics().upload_rate();
p.payload_down_speed = statistics().download_payload_rate();
p.payload_up_speed = statistics().upload_payload_rate();
p.pid = pid();
p.ip = remote();
p.total_download = statistics().total_payload_download();
p.total_upload = statistics().total_payload_upload();
if (m_ul_bandwidth_quota.given == std::numeric_limits<int>::max())
p.upload_limit = -1;
else
p.upload_limit = m_ul_bandwidth_quota.given;
if (m_dl_bandwidth_quota.given == std::numeric_limits<int>::max())
p.download_limit = -1;
else
p.download_limit = m_dl_bandwidth_quota.given;
p.load_balancing = total_free_upload();
p.download_queue_length = (int)download_queue().size();
p.upload_queue_length = (int)upload_queue().size();
if (boost::optional<piece_block_progress> ret = downloading_piece_progress())
{
p.downloading_piece_index = ret->piece_index;
p.downloading_block_index = ret->block_index;
p.downloading_progress = ret->bytes_downloaded;
p.downloading_total = ret->full_block_bytes;
}
else
{
p.downloading_piece_index = -1;
p.downloading_block_index = -1;
p.downloading_progress = 0;
p.downloading_total = 0;
}
p.flags = 0;
if (is_interesting()) p.flags |= peer_info::interesting;
if (is_choked()) p.flags |= peer_info::choked;
if (is_peer_interested()) p.flags |= peer_info::remote_interested;
if (has_peer_choked()) p.flags |= peer_info::remote_choked;
if (support_extensions()) p.flags |= peer_info::supports_extensions;
if (is_local()) p.flags |= peer_info::local_connection;
if (!is_connecting() && m_state < read_packet_size)
p.flags |= peer_info::handshake;
if (is_connecting() && !is_queued()) p.flags |= peer_info::connecting;
if (is_queued()) p.flags |= peer_info::queued;
p.pieces = get_bitfield();
p.seed = is_seed();
p.client = m_client_version;
p.connection_type = peer_info::standard_bittorrent;
}
void bt_peer_connection::write_handshake()
{
INVARIANT_CHECK;
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
// add handshake to the send buffer
const char version_string[] = "BitTorrent protocol";
const int string_len = sizeof(version_string)-1;
buffer::interval i = allocate_send_buffer(1 + string_len + 8 + 20 + 20);
// length of version string
*i.begin = string_len;
++i.begin;
// version string itself
std::copy(
version_string
, version_string + string_len
, i.begin);
i.begin += string_len;
// 8 zeroes
std::fill(i.begin, i.begin + 8, 0);
#ifndef TORRENT_DISABLE_DHT
// indicate that we support the DHT messages
*(i.begin + 7) = 0x01;
#endif
#ifndef TORRENT_DISABLE_EXTENSIONS
// we support extensions
*(i.begin + 5) = 0x10;
#endif
i.begin += 8;
// info hash
sha1_hash const& ih = t->torrent_file().info_hash();
std::copy(ih.begin(), ih.end(), i.begin);
i.begin += 20;
// peer id
std::copy(
m_ses.get_peer_id().begin()
, m_ses.get_peer_id().end()
, i.begin);
i.begin += 20;
assert(i.begin == i.end);
#ifdef TORRENT_VERBOSE_LOGGING
using namespace boost::posix_time;
(*m_logger) << to_simple_string(second_clock::universal_time())
<< " ==> HANDSHAKE\n";
#endif
setup_send();
}
boost::optional<piece_block_progress> bt_peer_connection::downloading_piece_progress() const
{
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
buffer::const_interval recv_buffer = receive_buffer();
// are we currently receiving a 'piece' message?
if (m_state != read_packet
|| (recv_buffer.end - recv_buffer.begin) < 9
|| recv_buffer[0] != msg_piece)
return boost::optional<piece_block_progress>();
const char* ptr = recv_buffer.begin + 1;
peer_request r;
r.piece = detail::read_int32(ptr);
r.start = detail::read_int32(ptr);
r.length = packet_size() - 9;
// is any of the piece message header data invalid?
if (!verify_piece(r))
return boost::optional<piece_block_progress>();
piece_block_progress p;
p.piece_index = r.piece;
p.block_index = r.start / t->block_size();
p.bytes_downloaded = recv_buffer.end - recv_buffer.begin - 9;
p.full_block_bytes = r.length;
return boost::optional<piece_block_progress>(p);
}
// message handlers
// -----------------------------
// --------- KEEPALIVE ---------
// -----------------------------
void bt_peer_connection::on_keepalive()
{
INVARIANT_CHECK;
#ifdef TORRENT_VERBOSE_LOGGING
using namespace boost::posix_time;
(*m_logger) << to_simple_string(second_clock::universal_time())
<< " <== KEEPALIVE\n";
#endif
incoming_keepalive();
}
// -----------------------------
// ----------- CHOKE -----------
// -----------------------------
void bt_peer_connection::on_choke(int received)
{
INVARIANT_CHECK;
assert(received > 0);
if (packet_size() != 1)
throw protocol_error("'choke' message size != 1");
m_statistics.received_bytes(0, received);
if (!packet_finished()) return;
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_choke()) return;
}
#endif
incoming_choke();
}
// -----------------------------
// ---------- UNCHOKE ----------
// -----------------------------
void bt_peer_connection::on_unchoke(int received)
{
INVARIANT_CHECK;
assert(received > 0);
if (packet_size() != 1)
throw protocol_error("'unchoke' message size != 1");
m_statistics.received_bytes(0, received);
if (!packet_finished()) return;
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_unchoke()) return;
}
#endif
incoming_unchoke();
}
// -----------------------------
// -------- INTERESTED ---------
// -----------------------------
void bt_peer_connection::on_interested(int received)
{
INVARIANT_CHECK;
assert(received > 0);
if (packet_size() != 1)
throw protocol_error("'interested' message size != 1");
m_statistics.received_bytes(0, received);
if (!packet_finished()) return;
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_interested()) return;
}
#endif
incoming_interested();
}
// -----------------------------
// ------ NOT INTERESTED -------
// -----------------------------
void bt_peer_connection::on_not_interested(int received)
{
INVARIANT_CHECK;
assert(received > 0);
if (packet_size() != 1)
throw protocol_error("'not interested' message size != 1");
m_statistics.received_bytes(0, received);
if (!packet_finished()) return;
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_not_interested()) return;
}
#endif
incoming_not_interested();
}
// -----------------------------
// ----------- HAVE ------------
// -----------------------------
void bt_peer_connection::on_have(int received)
{
INVARIANT_CHECK;
assert(received > 0);
if (packet_size() != 5)
throw protocol_error("'have' message size != 5");
m_statistics.received_bytes(0, received);
if (!packet_finished()) return;
buffer::const_interval recv_buffer = receive_buffer();
const char* ptr = recv_buffer.begin + 1;
int index = detail::read_int32(ptr);
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_have(index)) return;
}
#endif
incoming_have(index);
}
// -----------------------------
// --------- BITFIELD ----------
// -----------------------------
void bt_peer_connection::on_bitfield(int received)
{
INVARIANT_CHECK;
assert(received > 0);
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
// if we don't have the metedata, we cannot
// verify the bitfield size
if (t->valid_metadata()
&& packet_size() - 1 != ((int)get_bitfield().size() + 7) / 8)
throw protocol_error("bitfield with invalid size");
m_statistics.received_bytes(0, received);
if (!packet_finished()) return;
buffer::const_interval recv_buffer = receive_buffer();
std::vector<bool> bitfield;
if (!t->valid_metadata())
bitfield.resize((packet_size() - 1) * 8);
else
bitfield.resize(get_bitfield().size());
// if we don't have metadata yet
// just remember the bitmask
// don't update the piecepicker
// (since it doesn't exist yet)
for (int i = 0; i < (int)bitfield.size(); ++i)
bitfield[i] = (recv_buffer[1 + (i>>3)] & (1 << (7 - (i&7)))) != 0;
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_bitfield(bitfield)) return;
}
#endif
incoming_bitfield(bitfield);
}
// -----------------------------
// ---------- REQUEST ----------
// -----------------------------
void bt_peer_connection::on_request(int received)
{
INVARIANT_CHECK;
assert(received > 0);
if (packet_size() != 13)
throw protocol_error("'request' message size != 13");
m_statistics.received_bytes(0, received);
if (!packet_finished()) return;
buffer::const_interval recv_buffer = receive_buffer();
peer_request r;
const char* ptr = recv_buffer.begin + 1;
r.piece = detail::read_int32(ptr);
r.start = detail::read_int32(ptr);
r.length = detail::read_int32(ptr);
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_request(r)) return;
}
#endif
incoming_request(r);
}
// -----------------------------
// ----------- PIECE -----------
// -----------------------------
void bt_peer_connection::on_piece(int received)
{
INVARIANT_CHECK;
assert(received > 0);
buffer::const_interval recv_buffer = receive_buffer();
int recv_pos = recv_buffer.end - recv_buffer.begin;
// classify the received data as protocol chatter
// or data payload for the statistics
if (recv_pos <= 9)
// only received protocol data
m_statistics.received_bytes(0, received);
else if (recv_pos - received >= 9)
// only received payload data
m_statistics.received_bytes(received, 0);
else
{
// received a bit of both
assert(recv_pos - received < 9);
assert(recv_pos > 9);
assert(9 - (recv_pos - received) <= 9);
m_statistics.received_bytes(
recv_pos - 9
, 9 - (recv_pos - received));
}
incoming_piece_fragment();
if (!packet_finished()) return;
const char* ptr = recv_buffer.begin + 1;
peer_request p;
p.piece = detail::read_int32(ptr);
p.start = detail::read_int32(ptr);
p.length = packet_size() - 9;
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_piece(p, recv_buffer.begin + 9)) return;
}
#endif
incoming_piece(p, recv_buffer.begin + 9);
}
// -----------------------------
// ---------- CANCEL -----------
// -----------------------------
void bt_peer_connection::on_cancel(int received)
{
INVARIANT_CHECK;
assert(received > 0);
if (packet_size() != 13)
throw protocol_error("'cancel' message size != 13");
m_statistics.received_bytes(0, received);
if (!packet_finished()) return;
buffer::const_interval recv_buffer = receive_buffer();
peer_request r;
const char* ptr = recv_buffer.begin + 1;
r.piece = detail::read_int32(ptr);
r.start = detail::read_int32(ptr);
r.length = detail::read_int32(ptr);
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_cancel(r)) return;
}
#endif
incoming_cancel(r);
}
// -----------------------------
// --------- DHT PORT ----------
// -----------------------------
void bt_peer_connection::on_dht_port(int received)
{
INVARIANT_CHECK;
assert(received > 0);
if (packet_size() != 3)
throw protocol_error("'dht_port' message size != 3");
m_statistics.received_bytes(0, received);
if (!packet_finished()) return;
buffer::const_interval recv_buffer = receive_buffer();
const char* ptr = recv_buffer.begin + 1;
int listen_port = detail::read_uint16(ptr);
incoming_dht_port(listen_port);
}
// -----------------------------
// --------- EXTENDED ----------
// -----------------------------
void bt_peer_connection::on_extended(int received)
{
INVARIANT_CHECK;
assert(received > 0);
m_statistics.received_bytes(0, received);
if (packet_size() < 2)
throw protocol_error("'extended' message smaller than 2 bytes");
if (associated_torrent().expired())
throw protocol_error("'extended' message sent before proper handshake");
buffer::const_interval recv_buffer = receive_buffer();
if (recv_buffer.left() < 2) return;
assert(*recv_buffer.begin == msg_extended);
++recv_buffer.begin;
int extended_id = detail::read_uint8(recv_buffer.begin);
if (extended_id == 0)
{
on_extended_handshake();
return;
}
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_extended(packet_size() - 2, extended_id
, recv_buffer))
return;
}
#endif
throw protocol_error("unknown extended message id: "
+ boost::lexical_cast<std::string>(extended_id));
}
/*
void bt_peer_connection::write_chat_message(const std::string& msg)
{
INVARIANT_CHECK;
assert(msg.length() <= 1 * 1024);
if (!supports_extension(extended_chat_message)) return;
entry e(entry::dictionary_t);
e["msg"] = msg;
std::vector<char> message;
bencode(std::back_inserter(message), e);
buffer::interval i = allocate_send_buffer(message.size() + 6);
detail::write_uint32(1 + 1 + (int)message.size(), i.begin);
detail::write_uint8(msg_extended, i.begin);
detail::write_uint8(m_extension_messages[extended_chat_message], i.begin);
std::copy(message.begin(), message.end(), i.begin);
i.begin += message.size();
assert(i.begin == i.end);
setup_send();
}
*/
void bt_peer_connection::on_extended_handshake()
{
if (!packet_finished()) return;
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
buffer::const_interval recv_buffer = receive_buffer();
entry root;
try
{
root = bdecode(recv_buffer.begin + 2, recv_buffer.end);
}
catch (std::exception& exc)
{
#ifdef TORRENT_VERBOSE_LOGGIGN
(*m_logger) << "invalid extended handshake: " << exc.what() << "\n";
#endif
return;
}
#ifdef TORRENT_VERBOSE_LOGGIGN
std::stringstream ext;
root.print(ext);
(*m_logger) << "<== EXTENDED HANDSHAKE: \n" << ext.str();
#endif
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end;)
{
// a false return value means that the extension
// isn't supported by the other end. So, it is removed.
if (!(*i)->on_extension_handshake(root))
i = m_extensions.erase(i);
else
++i;
}
#endif
// there is supposed to be a remote listen port
if (entry* listen_port = root.find_key("p"))
{
if (listen_port->type() == entry::int_t)
{
tcp::endpoint adr(remote().address()
, (unsigned short)listen_port->integer());
t->get_policy().peer_from_tracker(adr, pid());
}
}
// there should be a version too
// but where do we put that info?
if (entry* client_info = root.find_key("v"))
{
if (client_info->type() == entry::string_t)
m_client_version = client_info->string();
}
if (entry* reqq = root.find_key("reqq"))
{
if (reqq->type() == entry::int_t)
m_max_out_request_queue = reqq->integer();
if (m_max_out_request_queue < 1)
m_max_out_request_queue = 1;
}
}
bool bt_peer_connection::dispatch_message(int received)
{
INVARIANT_CHECK;
assert(received > 0);
// this means the connection has been closed already
if (associated_torrent().expired()) return false;
buffer::const_interval recv_buffer = receive_buffer();
int packet_type = recv_buffer[0];
if (packet_type < 0
|| packet_type >= num_supported_messages
|| m_message_handler[packet_type] == 0)
{
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_unknown_message(packet_size(), packet_type
, buffer::const_interval(recv_buffer.begin+1
, recv_buffer.end)))
return packet_finished();
}
#endif
throw protocol_error("unknown message id: "
+ boost::lexical_cast<std::string>(packet_type)
+ " size: " + boost::lexical_cast<std::string>(packet_size()));
}
assert(m_message_handler[packet_type] != 0);
// call the correct handler for this packet type
(this->*m_message_handler[packet_type])(received);
return packet_finished();
}
void bt_peer_connection::write_keepalive()
{
INVARIANT_CHECK;
char buf[] = {0,0,0,0};
send_buffer(buf, buf + sizeof(buf));
}
void bt_peer_connection::write_cancel(peer_request const& r)
{
INVARIANT_CHECK;
assert(associated_torrent().lock()->valid_metadata());
char buf[] = {0,0,0,13, msg_cancel};
buffer::interval i = allocate_send_buffer(17);
std::copy(buf, buf + 5, i.begin);
i.begin += 5;
// index
detail::write_int32(r.piece, i.begin);
// begin
detail::write_int32(r.start, i.begin);
// length
detail::write_int32(r.length, i.begin);
assert(i.begin == i.end);
setup_send();
}
void bt_peer_connection::write_request(peer_request const& r)
{
INVARIANT_CHECK;
assert(associated_torrent().lock()->valid_metadata());
char buf[] = {0,0,0,13, msg_request};
buffer::interval i = allocate_send_buffer(17);
std::copy(buf, buf + 5, i.begin);
i.begin += 5;
// index
detail::write_int32(r.piece, i.begin);
// begin
detail::write_int32(r.start, i.begin);
// length
detail::write_int32(r.length, i.begin);
assert(i.begin == i.end);
setup_send();
}
void bt_peer_connection::write_bitfield(std::vector<bool> const& bitfield)
{
INVARIANT_CHECK;
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
assert(m_sent_bitfield == false);
assert(t->valid_metadata());
#ifdef TORRENT_VERBOSE_LOGGING
using namespace boost::posix_time;
(*m_logger) << to_simple_string(second_clock::universal_time())
<< " ==> BITFIELD ";
for (int i = 0; i < (int)get_bitfield().size(); ++i)
{
if (bitfield[i]) (*m_logger) << "1";
else (*m_logger) << "0";
}
(*m_logger) << "\n";
#endif
const int packet_size = ((int)bitfield.size() + 7) / 8 + 5;
buffer::interval i = allocate_send_buffer(packet_size);
detail::write_int32(packet_size - 4, i.begin);
detail::write_uint8(msg_bitfield, i.begin);
std::fill(i.begin, i.end, 0);
for (int c = 0; c < (int)bitfield.size(); ++c)
{
if (bitfield[c])
i.begin[c >> 3] |= 1 << (7 - (c & 7));
}
assert(i.end - i.begin == ((int)bitfield.size() + 7) / 8);
#ifndef NDEBUG
m_sent_bitfield = true;
#endif
setup_send();
}
#ifndef TORRENT_DISABLE_EXTENSIONS
void bt_peer_connection::write_extensions()
{
INVARIANT_CHECK;
#ifdef TORRENT_VERBOSE_LOGGING
using namespace boost::posix_time;
(*m_logger) << to_simple_string(second_clock::universal_time())
<< " ==> EXTENSIONS\n";
#endif
assert(m_supports_extensions);
entry handshake(entry::dictionary_t);
entry extension_list(entry::dictionary_t);
handshake["m"] = extension_list;
handshake["p"] = m_ses.listen_port();
handshake["v"] = m_ses.settings().user_agent;
std::string remote_address;
std::back_insert_iterator<std::string> out(remote_address);
detail::write_address(remote().address(), out);
handshake["ip"] = remote_address;
handshake["reqq"] = m_ses.settings().max_allowed_in_request_queue;
// loop backwards, to make the first extension be the last
// to fill in the handshake (i.e. give the first extensions priority)
for (extension_list_t::reverse_iterator i = m_extensions.rbegin()
, end(m_extensions.rend()); i != end; ++i)
{
(*i)->add_handshake(handshake);
}
std::vector<char> msg;
bencode(std::back_inserter(msg), handshake);
// make room for message
buffer::interval i = allocate_send_buffer(6 + msg.size());
// write the length of the message
detail::write_int32((int)msg.size() + 2, i.begin);
detail::write_uint8(msg_extended, i.begin);
// signal handshake message
detail::write_uint8(0, i.begin);
std::copy(msg.begin(), msg.end(), i.begin);
i.begin += msg.size();
assert(i.begin == i.end);
#ifdef TORRENT_VERBOSE_LOGGING
std::stringstream ext;
handshake.print(ext);
(*m_logger) << "==> EXTENDED HANDSHAKE: \n" << ext.str();
#endif
setup_send();
}
#endif
void bt_peer_connection::write_choke()
{
INVARIANT_CHECK;
if (is_choked()) return;
char msg[] = {0,0,0,1,msg_choke};
send_buffer(msg, msg + sizeof(msg));
}
void bt_peer_connection::write_unchoke()
{
INVARIANT_CHECK;
char msg[] = {0,0,0,1,msg_unchoke};
send_buffer(msg, msg + sizeof(msg));
}
void bt_peer_connection::write_interested()
{
INVARIANT_CHECK;
char msg[] = {0,0,0,1,msg_interested};
send_buffer(msg, msg + sizeof(msg));
}
void bt_peer_connection::write_not_interested()
{
INVARIANT_CHECK;
char msg[] = {0,0,0,1,msg_not_interested};
send_buffer(msg, msg + sizeof(msg));
}
void bt_peer_connection::write_have(int index)
{
assert(associated_torrent().lock()->valid_metadata());
assert(index >= 0);
assert(index < associated_torrent().lock()->torrent_file().num_pieces());
INVARIANT_CHECK;
const int packet_size = 9;
char msg[packet_size] = {0,0,0,5,msg_have};
char* ptr = msg + 5;
detail::write_int32(index, ptr);
send_buffer(msg, msg + packet_size);
}
void bt_peer_connection::write_piece(peer_request const& r)
{
INVARIANT_CHECK;
const int packet_size = 4 + 5 + 4 + r.length;
boost::shared_ptr<torrent> t = associated_torrent().lock();
assert(t);
buffer::interval i = allocate_send_buffer(packet_size);
detail::write_int32(packet_size-4, i.begin);
detail::write_uint8(msg_piece, i.begin);
detail::write_int32(r.piece, i.begin);
detail::write_int32(r.start, i.begin);
t->filesystem().read(
i.begin, r.piece, r.start, r.length);
assert(i.begin + r.length == i.end);
m_payloads.push_back(range(send_buffer_size() - r.length, r.length));
setup_send();
}
// --------------------------
// RECEIVE DATA
// --------------------------
// throws exception when the client should be disconnected
void bt_peer_connection::on_receive(asio::error_code const& error
, std::size_t bytes_transferred)
{
INVARIANT_CHECK;
if (error) return;
buffer::const_interval recv_buffer = receive_buffer();
boost::shared_ptr<torrent> t = associated_torrent().lock();
switch(m_state)
{
case read_protocol_length:
{
m_statistics.received_bytes(0, bytes_transferred);
if (!packet_finished()) break;
int packet_size = recv_buffer[0];
#ifdef TORRENT_VERBOSE_LOGGING
(*m_logger) << " protocol length: " << packet_size << "\n";
#endif
if (packet_size > 100 || packet_size <= 0)
{
std::stringstream s;
s << "incorrect protocol length ("
<< packet_size
<< ") should be 19.";
throw std::runtime_error(s.str());
}
m_state = read_protocol_string;
reset_recv_buffer(packet_size);
}
break;
case read_protocol_string:
{
m_statistics.received_bytes(0, bytes_transferred);
if (!packet_finished()) break;
#ifdef TORRENT_VERBOSE_LOGGING
(*m_logger) << " protocol: '" << std::string(recv_buffer.begin
, recv_buffer.end) << "'\n";
#endif
const char protocol_string[] = "BitTorrent protocol";
if (!std::equal(recv_buffer.begin, recv_buffer.end
, protocol_string))
{
const char cmd[] = "version";
if (recv_buffer.end - recv_buffer.begin == 7 && std::equal(
recv_buffer.begin, recv_buffer.end, cmd))
{
#ifdef TORRENT_VERBOSE_LOGGING
(*m_logger) << "sending libtorrent version\n";
#endif
asio::write(*get_socket(), asio::buffer("libtorrent version " LIBTORRENT_VERSION "\n", 27));
throw std::runtime_error("closing");
}
#ifdef TORRENT_VERBOSE_LOGGING
(*m_logger) << "incorrect protocol name\n";
#endif
std::stringstream s;
s << "got invalid protocol name: '"
<< std::string(recv_buffer.begin, recv_buffer.end)
<< "'";
throw std::runtime_error(s.str());
}
m_state = read_info_hash;
reset_recv_buffer(28);
}
break;
case read_info_hash:
{
m_statistics.received_bytes(0, bytes_transferred);
if (!packet_finished()) break;
// MassaRoddel
#ifdef TORRENT_VERBOSE_LOGGING
for (int i=0; i < 8; ++i)
{
for (int j=0; j < 8; ++j)
{
if (recv_buffer[i] & (0x80 >> j)) (*m_logger) << "1";
else (*m_logger) << "0";
}
}
(*m_logger) << "\n";
if (recv_buffer[7] & 0x01)
(*m_logger) << "supports DHT port message\n";
if (recv_buffer[7] & 0x02)
(*m_logger) << "supports XBT peer exchange message\n";
if (recv_buffer[5] & 0x10)
(*m_logger) << "supports LT/uT extensions\n";
#endif
#ifndef DISABLE_EXTENSIONS
if ((recv_buffer[5] & 0x10))
m_supports_extensions = true;
#endif
if (recv_buffer[7] & 0x01)
m_supports_dht_port = true;
// ok, now we have got enough of the handshake. Is this connection
// attached to a torrent?
if (!t)
{
// now, we have to see if there's a torrent with the
// info_hash we got from the peer
sha1_hash info_hash;
std::copy(recv_buffer.begin + 8, recv_buffer.begin + 28
, (char*)info_hash.begin());
attach_to_torrent(info_hash);
t = associated_torrent().lock();
assert(t);
assert(t->get_policy().has_connection(this));
// yes, we found the torrent
// reply with our handshake
write_handshake();
if (t->valid_metadata())
write_bitfield(t->pieces());
}
else
{
// verify info hash
if (!std::equal(recv_buffer.begin + 8, recv_buffer.begin + 28
, (const char*)t->torrent_file().info_hash().begin()))
{
#ifdef TORRENT_VERBOSE_LOGGING
(*m_logger) << " received invalid info_hash\n";
#endif
throw std::runtime_error("invalid info-hash in handshake");
}
}
#ifndef TORRENT_DISABLE_DHT
if (m_supports_dht_port && m_ses.m_dht)
write_dht_port(m_ses.kad_settings().service_port);
#endif
m_state = read_peer_id;
reset_recv_buffer(20);
#ifdef TORRENT_VERBOSE_LOGGING
(*m_logger) << " info_hash received\n";
#endif
}
break;
case read_peer_id:
{
if (!t) return;
m_statistics.received_bytes(0, bytes_transferred);
if (!packet_finished()) break;
assert(packet_size() == 20);
#ifdef TORRENT_VERBOSE_LOGGING
{
peer_id tmp;
std::copy(recv_buffer.begin, recv_buffer.begin + 20, (char*)tmp.begin());
std::stringstream s;
s << "received peer_id: " << tmp << " client: " << identify_client(tmp) << "\n";
s << "as ascii: ";
for (peer_id::iterator i = tmp.begin(); i != tmp.end(); ++i)
{
if (std::isprint(*i)) s << *i;
else s << ".";
}
s << "\n";
(*m_logger) << s.str();
}
#endif
peer_id pid;
std::copy(recv_buffer.begin, recv_buffer.begin + 20, (char*)pid.begin());
set_pid(pid);
m_client_version = identify_client(pid);
boost::optional<fingerprint> f = client_fingerprint(pid);
if (f && std::equal(f->name, f->name + 2, "BC"))
{
// if this is a bitcomet client, lower the request queue size limit
if (m_max_out_request_queue > 50) m_max_out_request_queue = 50;
}
// disconnect if the peer has the same peer-id as ourself
// since it most likely is ourself then
if (pid == m_ses.get_peer_id())
throw std::runtime_error("closing connection to ourself");
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end;)
{
if (!(*i)->on_handshake())
{
i = m_extensions.erase(i);
}
else
{
++i;
}
}
if (m_supports_extensions) write_extensions();
#endif
/*
if (!m_active)
{
m_attached_to_torrent = true;
assert(m_torrent->get_policy().has_connection(this));
}
*/
m_state = read_packet_size;
reset_recv_buffer(4);
}
break;
case read_packet_size:
{
if (!t) return;
m_statistics.received_bytes(0, bytes_transferred);
if (!packet_finished()) break;
const char* ptr = recv_buffer.begin;
int packet_size = detail::read_int32(ptr);
// don't accept packets larger than 1 MB
if (packet_size > 1024*1024 || packet_size < 0)
{
// packet too large
throw std::runtime_error("packet > 1 MB ("
+ boost::lexical_cast<std::string>(
(unsigned int)packet_size) + " bytes)");
}
if (packet_size == 0)
{
incoming_keepalive();
// keepalive message
m_state = read_packet_size;
reset_recv_buffer(4);
}
else
{
m_state = read_packet;
reset_recv_buffer(packet_size);
}
}
break;
case read_packet:
{
if (!t) return;
if (dispatch_message(bytes_transferred))
{
m_state = read_packet_size;
reset_recv_buffer(4);
}
}
break;
}
}
// --------------------------
// SEND DATA
// --------------------------
// throws exception when the client should be disconnected
void bt_peer_connection::on_sent(asio::error_code const& error
, std::size_t bytes_transferred)
{
INVARIANT_CHECK;
if (error) return;
// manage the payload markers
int amount_payload = 0;
if (!m_payloads.empty())
{
for (std::deque<range>::iterator i = m_payloads.begin();
i != m_payloads.end(); ++i)
{
i->start -= bytes_transferred;
if (i->start < 0)
{
if (i->start + i->length <= 0)
{
amount_payload += i->length;
}
else
{
amount_payload += -i->start;
i->length -= -i->start;
i->start = 0;
}
}
}
}
// TODO: move the erasing into the loop above
// remove all payload ranges that has been sent
m_payloads.erase(
std::remove_if(m_payloads.begin(), m_payloads.end(), range_below_zero)
, m_payloads.end());
assert(amount_payload <= (int)bytes_transferred);
m_statistics.sent_bytes(amount_payload, bytes_transferred - amount_payload);
}
/*
void bt_peer_connection::on_tick()
{
boost::shared_ptr<torrent> t = associated_torrent().lock();
if (!t) return;
// if we don't have any metadata, and this peer
// supports the request metadata extension
// and we aren't currently waiting for a request
// reply. Then, send a request for some metadata.
if (!t->valid_metadata()
&& supports_extension(extended_metadata_message)
&& !m_waiting_metadata_request
&& has_metadata())
{
m_last_metadata_request = t->metadata_request();
write_metadata_request(m_last_metadata_request);
m_waiting_metadata_request = true;
m_metadata_request = second_clock::universal_time();
}
}
*/
#ifndef NDEBUG
void bt_peer_connection::check_invariant() const
{
if (!m_in_constructor)
peer_connection::check_invariant();
if (!m_payloads.empty())
{
for (std::deque<range>::const_iterator i = m_payloads.begin();
i != m_payloads.end() - 1; ++i)
{
assert(i->start + i->length <= (i+1)->start);
}
}
}
#endif
}
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