premiere-libtorrent/src/bt_peer_connection.cpp

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/*
2014-02-23 20:12:25 +01:00
Copyright (c) 2003-2014, Arvid Norberg
Copyright (c) 2007-2014, Arvid Norberg, Un Shyam
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 <boost/limits.hpp>
#include <boost/bind.hpp>
#ifdef TORRENT_USE_OPENSSL
#include <memory> // autp_ptr
#endif
#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"
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#include "libtorrent/socket_io.hpp"
#include "libtorrent/version.hpp"
#include "libtorrent/extensions.hpp"
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#include "libtorrent/aux_/session_interface.hpp"
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#include "libtorrent/broadcast_socket.hpp"
#include "libtorrent/escape_string.hpp"
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#include "libtorrent/peer_info.hpp"
#include "libtorrent/random.hpp"
#include "libtorrent/alloca.hpp"
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#include "libtorrent/socket_type.hpp"
#include "libtorrent/performance_counters.hpp" // for counters
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
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#include "libtorrent/pe_crypto.hpp"
#include "libtorrent/hasher.hpp"
#endif
using boost::shared_ptr;
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,
// FAST extension messages
&bt_peer_connection::on_suggest_piece,
&bt_peer_connection::on_have_all,
&bt_peer_connection::on_have_none,
&bt_peer_connection::on_reject_request,
&bt_peer_connection::on_allowed_fast,
#ifndef TORRENT_DISABLE_EXTENSIONS
0, 0,
&bt_peer_connection::on_extended
#endif
};
bt_peer_connection::bt_peer_connection(peer_connection_args const& pack
, peer_id const& pid)
: peer_connection(pack)
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, m_state(read_protocol_identifier)
, m_supports_extensions(false)
, m_supports_dht_port(false)
, m_supports_fast(false)
, m_sent_bitfield(false)
, m_sent_handshake(false)
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
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, m_encrypted(false)
, m_rc4_encrypted(false)
, m_recv_buffer(peer_connection::m_recv_buffer)
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#endif
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, m_our_peer_id(pid)
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
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, m_sync_bytes_read(0)
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#endif
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#ifndef TORRENT_DISABLE_EXTENSIONS
, m_upload_only_id(0)
, m_holepunch_id(0)
#endif
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#ifndef TORRENT_DISABLE_EXTENSIONS
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, m_dont_have_id(0)
, m_share_mode_id(0)
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#endif
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
, m_in_constructor(true)
#endif
{
#ifdef TORRENT_LOGGING
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peer_log("*** bt_peer_connection");
#endif
#if TORRENT_USE_ASSERTS
m_in_constructor = false;
#endif
#ifndef TORRENT_DISABLE_EXTENSIONS
memset(m_reserved_bits, 0, sizeof(m_reserved_bits));
#endif
}
void bt_peer_connection::start()
{
peer_connection::start();
// start in the state where we are trying to read the
// handshake from the other side
m_recv_buffer.reset(20);
setup_receive();
}
bt_peer_connection::~bt_peer_connection()
{
}
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
void bt_peer_connection::switch_send_crypto(boost::shared_ptr<crypto_plugin> crypto)
{
if (m_enc_handler.switch_send_crypto(crypto, send_buffer_size() - get_send_barrier()))
set_send_barrier(send_buffer_size());
}
void bt_peer_connection::switch_recv_crypto(boost::shared_ptr<crypto_plugin> crypto)
{
m_enc_handler.switch_recv_crypto(crypto, m_recv_buffer);
}
#endif
void bt_peer_connection::on_connected()
{
if (is_disconnecting()) return;
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
if (t->graceful_pause())
{
#ifdef TORRENT_LOGGING
peer_log("*** ON_CONNECTED [ graceful-paused ]");
#endif
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disconnect(error_code(errors::torrent_paused), op_bittorrent);
return;
}
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// make sure are much as possible of the response ends up in the same
// packet, or at least back-to-back packets
cork c_(*this);
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
boost::uint8_t out_enc_policy = m_settings.get_int(settings_pack::out_enc_policy);
#ifdef TORRENT_USE_OPENSSL
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// never try an encrypted connection when already using SSL
if (is_ssl(*get_socket()))
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out_enc_policy = settings_pack::pe_disabled;
#endif
#ifdef TORRENT_LOGGING
char const* policy_name[] = {"forced", "enabled", "disabled"};
peer_log("*** outgoing encryption policy: %s", policy_name[out_enc_policy]);
#endif
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if (out_enc_policy == settings_pack::pe_forced)
{
write_pe1_2_dhkey();
if (is_disconnecting()) return;
m_state = read_pe_dhkey;
m_recv_buffer.reset(dh_key_len);
setup_receive();
}
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else if (out_enc_policy == settings_pack::pe_enabled)
{
TORRENT_ASSERT(peer_info_struct());
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torrent_peer* pi = peer_info_struct();
if (pi->pe_support == true)
{
// toggle encryption support flag, toggled back to
// true if encrypted portion of the handshake
// completes correctly
pi->pe_support = false;
// if this fails, we need to reconnect
// fast.
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fast_reconnect(true);
write_pe1_2_dhkey();
if (is_disconnecting()) return;
m_state = read_pe_dhkey;
m_recv_buffer.reset(dh_key_len);
setup_receive();
}
else // pi->pe_support == false
{
// toggled back to false if standard handshake
// completes correctly (without encryption)
pi->pe_support = true;
write_handshake();
m_recv_buffer.reset(20);
setup_receive();
}
}
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else if (out_enc_policy == settings_pack::pe_disabled)
#endif
{
write_handshake();
// start in the state where we are trying to read the
// handshake from the other side
m_recv_buffer.reset(20);
setup_receive();
}
}
void bt_peer_connection::on_metadata()
{
#ifdef TORRENT_LOGGING
peer_log("*** ON_METADATA");
#endif
disconnect_if_redundant();
if (m_disconnecting) return;
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// connections that are still in the handshake
// will send their bitfield when the handshake
// is done
#ifndef TORRENT_DISABLE_EXTENSIONS
write_upload_only();
#endif
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if (!m_sent_handshake) return;
if (m_sent_bitfield) return;
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
write_bitfield();
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TORRENT_ASSERT(m_sent_bitfield);
#ifndef TORRENT_DISABLE_DHT
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if (m_supports_dht_port && m_ses.has_dht())
write_dht_port(m_ses.external_udp_port());
#endif
}
void bt_peer_connection::write_dht_port(int listen_port)
{
INVARIANT_CHECK;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
#ifdef TORRENT_LOGGING
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peer_log("==> DHT_PORT [ %d ]", listen_port);
#endif
char msg[] = {0,0,0,3, msg_dht_port, 0, 0};
char* ptr = msg + 5;
detail::write_uint16(listen_port, ptr);
send_buffer(msg, sizeof(msg));
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stats_counters().inc_stats_counter(counters::num_outgoing_dht_port);
}
void bt_peer_connection::write_have_all()
{
INVARIANT_CHECK;
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TORRENT_ASSERT(m_sent_handshake);
m_sent_bitfield = true;
#ifdef TORRENT_LOGGING
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peer_log("==> HAVE_ALL");
#endif
char msg[] = {0,0,0,1, msg_have_all};
send_buffer(msg, sizeof(msg));
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stats_counters().inc_stats_counter(counters::num_outgoing_have_all);
}
void bt_peer_connection::write_have_none()
{
INVARIANT_CHECK;
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TORRENT_ASSERT(m_sent_handshake);
m_sent_bitfield = true;
#ifdef TORRENT_LOGGING
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peer_log("==> HAVE_NONE");
#endif
char msg[] = {0,0,0,1, msg_have_none};
send_buffer(msg, sizeof(msg));
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stats_counters().inc_stats_counter(counters::num_outgoing_have_none);
}
void bt_peer_connection::write_reject_request(peer_request const& r)
{
INVARIANT_CHECK;
stats_counters().inc_stats_counter(counters::piece_rejects);
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if (!m_supports_fast) return;
#ifdef TORRENT_LOGGING
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peer_log("==> REJECT_PIECE [ piece: %d | s: %d | l: %d ]"
, r.piece, r.start, r.length);
#endif
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
TORRENT_ASSERT(associated_torrent().lock()->valid_metadata());
char msg[] = {0,0,0,13, msg_reject_request,0,0,0,0, 0,0,0,0, 0,0,0,0};
char* ptr = msg + 5;
detail::write_int32(r.piece, ptr); // index
detail::write_int32(r.start, ptr); // begin
detail::write_int32(r.length, ptr); // length
send_buffer(msg, sizeof(msg));
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stats_counters().inc_stats_counter(counters::num_outgoing_reject);
}
void bt_peer_connection::write_allow_fast(int piece)
{
INVARIANT_CHECK;
if (!m_supports_fast) return;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
TORRENT_ASSERT(associated_torrent().lock()->valid_metadata());
char msg[] = {0,0,0,5, msg_allowed_fast, 0, 0, 0, 0};
char* ptr = msg + 5;
detail::write_int32(piece, ptr);
send_buffer(msg, sizeof(msg));
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stats_counters().inc_stats_counter(counters::num_outgoing_allowed_fast);
}
void bt_peer_connection::write_suggest(int piece)
{
INVARIANT_CHECK;
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if (!m_supports_fast) return;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
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TORRENT_ASSERT(t->valid_metadata());
#ifdef TORRENT_LOGGING
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peer_log("==> SUGGEST [ piece: %d num_peers: %d ]", piece
, t->has_picker() ? t->picker().get_availability(piece) : -1);
#endif
char msg[] = {0,0,0,5, msg_suggest_piece, 0, 0, 0, 0};
char* ptr = msg + 5;
detail::write_int32(piece, ptr);
send_buffer(msg, sizeof(msg));
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stats_counters().inc_stats_counter(counters::num_outgoing_suggest);
}
char random_byte()
{ return random() & 0xff; }
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void bt_peer_connection::get_specific_peer_info(peer_info& p) const
{
TORRENT_ASSERT(!associated_torrent().expired());
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_outgoing()) p.flags |= peer_info::local_connection;
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#if TORRENT_USE_I2P
if (is_i2p(*get_socket())) p.flags |= peer_info::i2p_socket;
#endif
if (is_utp(*get_socket())) p.flags |= peer_info::utp_socket;
if (is_ssl(*get_socket())) p.flags |= peer_info::ssl_socket;
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#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
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if (m_encrypted)
{
p.flags |= m_rc4_encrypted
? peer_info::rc4_encrypted
: peer_info::plaintext_encrypted;
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}
#endif
if (!is_connecting() && in_handshake())
p.flags |= peer_info::handshake;
if (is_connecting()) p.flags |= peer_info::connecting;
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p.client = m_client_version;
p.connection_type = peer_info::standard_bittorrent;
}
bool bt_peer_connection::in_handshake() const
{
return m_state < read_packet_size;
}
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
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void bt_peer_connection::write_pe1_2_dhkey()
{
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INVARIANT_CHECK;
TORRENT_ASSERT(!m_encrypted);
TORRENT_ASSERT(!m_rc4_encrypted);
TORRENT_ASSERT(!m_dh_key_exchange.get());
TORRENT_ASSERT(!m_sent_handshake);
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#ifdef TORRENT_LOGGING
if (is_outgoing())
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peer_log("*** initiating encrypted handshake");
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#endif
m_dh_key_exchange.reset(new (std::nothrow) dh_key_exchange);
if (!m_dh_key_exchange || !m_dh_key_exchange->good())
{
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disconnect(errors::no_memory, op_encryption);
return;
}
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int pad_size = random() % 512;
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#ifdef TORRENT_LOGGING
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peer_log(" pad size: %d", pad_size);
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#endif
char msg[dh_key_len + 512];
char* ptr = msg;
int buf_size = dh_key_len + pad_size;
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memcpy(ptr, m_dh_key_exchange->get_local_key(), dh_key_len);
ptr += dh_key_len;
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std::generate(ptr, ptr + pad_size, random_byte);
send_buffer(msg, buf_size);
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#ifdef TORRENT_LOGGING
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peer_log(" sent DH key");
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#endif
}
void bt_peer_connection::write_pe3_sync()
{
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INVARIANT_CHECK;
TORRENT_ASSERT(!m_encrypted);
TORRENT_ASSERT(!m_rc4_encrypted);
TORRENT_ASSERT(is_outgoing());
TORRENT_ASSERT(!m_sent_handshake);
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boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
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hasher h;
sha1_hash const& info_hash = t->torrent_file().info_hash();
char const* const secret = m_dh_key_exchange->get_secret();
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int pad_size = random() % 512;
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// synchash,skeyhash,vc,crypto_provide,len(pad),pad,len(ia)
char msg[20 + 20 + 8 + 4 + 2 + 512 + 2];
char* ptr = msg;
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// sync hash (hash('req1',S))
h.reset();
h.update("req1",4);
h.update(secret, dh_key_len);
sha1_hash sync_hash = h.final();
memcpy(ptr, &sync_hash[0], 20);
ptr += 20;
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// stream key obfuscated hash [ hash('req2',SKEY) xor hash('req3',S) ]
h.reset();
h.update("req2",4);
h.update((const char*)info_hash.begin(), 20);
sha1_hash streamkey_hash = h.final();
h.reset();
h.update("req3",4);
h.update(secret, dh_key_len);
sha1_hash obfsc_hash = h.final();
obfsc_hash ^= streamkey_hash;
memcpy(ptr, &obfsc_hash[0], 20);
ptr += 20;
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// Discard DH key exchange data, setup RC4 keys
init_pe_rc4_handler(secret, info_hash);
m_dh_key_exchange.reset(); // secret should be invalid at this point
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// write the verification constant and crypto field
int encrypt_size = sizeof(msg) - 512 + pad_size - 40;
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boost::uint8_t crypto_provide = m_settings.get_int(settings_pack::allowed_enc_level);
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// this is an invalid setting, but let's just make the best of the situation
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if ((crypto_provide & settings_pack::pe_both) == 0)
crypto_provide = settings_pack::pe_both;
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#ifdef TORRENT_LOGGING
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char const* level[] = {"plaintext", "rc4", "plaintext rc4"};
peer_log(" crypto provide : [ %s ]"
, level[crypto_provide-1]);
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#endif
write_pe_vc_cryptofield(ptr, encrypt_size, crypto_provide, pad_size);
std::vector<asio::mutable_buffer> vec;
vec.push_back(asio::mutable_buffer(ptr, encrypt_size));
m_rc4->encrypt(vec);
send_buffer(msg, sizeof(msg) - 512 + pad_size);
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}
void bt_peer_connection::write_pe4_sync(int crypto_select)
{
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INVARIANT_CHECK;
TORRENT_ASSERT(!is_outgoing());
TORRENT_ASSERT(!m_encrypted);
TORRENT_ASSERT(!m_rc4_encrypted);
TORRENT_ASSERT(crypto_select == 0x02 || crypto_select == 0x01);
TORRENT_ASSERT(!m_sent_handshake);
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int pad_size = random() % 512;
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const int buf_size = 8 + 4 + 2 + pad_size;
char msg[512 + 8 + 4 + 2];
write_pe_vc_cryptofield(msg, sizeof(msg), crypto_select, pad_size);
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std::vector<asio::mutable_buffer> vec;
vec.push_back(asio::mutable_buffer(msg, buf_size));
m_rc4->encrypt(vec);
send_buffer(msg, buf_size);
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// encryption method has been negotiated
if (crypto_select == 0x02)
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m_rc4_encrypted = true;
else // 0x01
m_rc4_encrypted = false;
#ifdef TORRENT_LOGGING
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peer_log(" crypto select : [ %s ]"
, (crypto_select == 0x01) ? "plaintext" : "rc4");
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#endif
}
void bt_peer_connection::write_pe_vc_cryptofield(char* write_buf, int len
, int crypto_field, int pad_size)
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{
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INVARIANT_CHECK;
TORRENT_ASSERT(crypto_field <= 0x03 && crypto_field > 0);
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// vc,crypto_field,len(pad),pad, (len(ia))
TORRENT_ASSERT((len >= 8+4+2+pad_size+2 && is_outgoing())
|| (len >= 8+4+2+pad_size && !is_outgoing()));
TORRENT_ASSERT(!m_sent_handshake);
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// encrypt(vc, crypto_provide/select, len(Pad), len(IA))
// len(pad) is zero for now, len(IA) only for outgoing connections
// vc
memset(write_buf, 0, 8);
write_buf += 8;
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detail::write_uint32(crypto_field, write_buf);
detail::write_uint16(pad_size, write_buf); // len (pad)
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// fill pad with zeroes
std::generate(write_buf, write_buf + pad_size, random_byte);
write_buf += pad_size;
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// append len(ia) if we are initiating
if (is_outgoing())
detail::write_uint16(handshake_len, write_buf); // len(IA)
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}
void bt_peer_connection::init_pe_rc4_handler(char const* secret, sha1_hash const& stream_key)
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{
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INVARIANT_CHECK;
TORRENT_ASSERT(secret);
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hasher h;
static const char keyA[] = "keyA";
static const char keyB[] = "keyB";
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// encryption rc4 longkeys
// outgoing connection : hash ('keyA',S,SKEY)
// incoming connection : hash ('keyB',S,SKEY)
if (is_outgoing()) h.update(keyA, 4); else h.update(keyB, 4);
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h.update(secret, dh_key_len);
h.update((char const*)stream_key.begin(), 20);
const sha1_hash local_key = h.final();
h.reset();
// decryption rc4 longkeys
// outgoing connection : hash ('keyB',S,SKEY)
// incoming connection : hash ('keyA',S,SKEY)
if (is_outgoing()) h.update(keyB, 4); else h.update(keyA, 4);
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h.update(secret, dh_key_len);
h.update((char const*)stream_key.begin(), 20);
const sha1_hash remote_key = h.final();
TORRENT_ASSERT(!m_rc4.get());
m_rc4 = boost::make_shared<rc4_handler>();
m_rc4->set_incoming_key(&remote_key[0], 20);
m_rc4->set_outgoing_key(&local_key[0], 20);
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if (!m_rc4)
{
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disconnect(errors::no_memory, op_encryption);
return;
}
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#ifdef TORRENT_LOGGING
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peer_log(" computed RC4 keys");
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#endif
}
int bt_peer_connection::get_syncoffset(char const* src, int src_size,
char const* target, int target_size) const
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{
TORRENT_ASSERT(target_size >= src_size);
TORRENT_ASSERT(src_size > 0);
TORRENT_ASSERT(src);
TORRENT_ASSERT(target);
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int traverse_limit = target_size - src_size;
// TODO: this could be optimized using knuth morris pratt
for (int i = 0; i < traverse_limit; ++i)
{
char const* target_ptr = target + i;
if (std::equal(src, src+src_size, target_ptr))
return i;
}
// // Partial sync
// for (int i = 0; i < target_size; ++i)
// {
// // first is iterator in src[] at which mismatch occurs
// // second is iterator in target[] at which mismatch occurs
// std::pair<const char*, const char*> ret;
// int src_sync_size;
// if (i > traverse_limit) // partial sync test
// {
// ret = std::mismatch(src, src + src_size - (i - traverse_limit), &target[i]);
// src_sync_size = ret.first - src;
// if (src_sync_size == (src_size - (i - traverse_limit)))
// return i;
// }
// else // complete sync test
// {
// ret = std::mismatch(src, src + src_size, &target[i]);
// src_sync_size = ret.first - src;
// if (src_sync_size == src_size)
// return i;
// }
// }
// no complete sync
return -1;
}
void bt_peer_connection::rc4_decrypt(char* pos, int len)
{
std::vector<asio::mutable_buffer> vec;
vec.push_back(asio::mutable_buffer(pos, len));
int consume = 0;
int produce = len;
int packet_size = 0;
m_rc4->decrypt(vec, consume, produce, packet_size);
}
#endif // #if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
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void regular_c_free(char* buf, void* /* userdata */
, block_cache_reference /* ref */)
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{
::free(buf);
}
void bt_peer_connection::append_const_send_buffer(char const* buffer, int size
, chained_buffer::free_buffer_fun destructor, void* userdata
, block_cache_reference ref)
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{
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
if (!m_enc_handler.is_send_plaintext())
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{
// if we're encrypting this buffer, we need to make a copy
// since we'll mutate it
char* buf = (char*)malloc(size);
memcpy(buf, buffer, size);
append_send_buffer(buf, size, &regular_c_free, NULL);
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destructor((char*)buffer, userdata, ref);
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}
else
#endif
{
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peer_connection::append_const_send_buffer(buffer, size, destructor
, userdata, ref);
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}
}
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void bt_peer_connection::write_handshake(bool plain_handshake)
{
INVARIANT_CHECK;
TORRENT_ASSERT(!m_sent_handshake);
m_sent_handshake = true;
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
// add handshake to the send buffer
const char version_string[] = "BitTorrent protocol";
const int string_len = sizeof(version_string)-1;
char handshake[1 + string_len + 8 + 20 + 20];
char* ptr = handshake;
// length of version string
detail::write_uint8(string_len, ptr);
// protocol identifier
memcpy(ptr, version_string, string_len);
ptr += string_len;
// 8 zeroes
memset(ptr, 0, 8);
#ifndef TORRENT_DISABLE_DHT
// indicate that we support the DHT messages
*(ptr + 7) |= 0x01;
#endif
#ifndef TORRENT_DISABLE_EXTENSIONS
// we support extensions
*(ptr + 5) |= 0x10;
#endif
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if (m_settings.get_bool(settings_pack::support_merkle_torrents))
{
// we support merkle torrents
*(ptr + 5) |= 0x08;
}
// we support FAST extension
*(ptr + 7) |= 0x04;
#ifdef TORRENT_LOGGING
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std::string bitmask;
for (int k = 0; k < 8; ++k)
{
for (int j = 0; j < 8; ++j)
{
if (ptr[k] & (0x80 >> j)) bitmask += '1';
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else bitmask += '0';
}
}
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peer_log("==> EXTENSIONS [ %s ]", bitmask.c_str());
#endif
ptr += 8;
// info hash
sha1_hash const& ih = t->torrent_file().info_hash();
memcpy(ptr, &ih[0], 20);
ptr += 20;
// peer id
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if (m_settings.get_bool(settings_pack::anonymous_mode))
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{
// in anonymous mode, every peer connection
// has a unique peer-id
for (int i = 0; i < 20; ++i)
m_our_peer_id[i] = random() & 0xff;
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}
memcpy(ptr, &m_our_peer_id[0], 20);
ptr += 20;
#ifdef TORRENT_LOGGING
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{
char hex_pid[41];
to_hex((char const*)&m_our_peer_id[0], 20, hex_pid);
hex_pid[40] = 0;
peer_log(">>> sent peer_id: %s client: %s"
, hex_pid, identify_client(m_our_peer_id).c_str());
}
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peer_log("==> HANDSHAKE [ ih: %s ]", to_hex(ih.to_string()).c_str());
#endif
send_buffer(handshake, sizeof(handshake));
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// for encrypted peers, just send a plain handshake. We
// don't know at this point if the rest should be
// obfuscated or not, we have to wait for the other end's
// response first.
if (plain_handshake) return;
// we don't know how many pieces there are until we
// have the metadata
if (t->ready_for_connections())
{
write_bitfield();
#ifndef TORRENT_DISABLE_DHT
if (m_supports_dht_port && m_ses.has_dht())
write_dht_port(m_ses.external_udp_port());
#endif
// if we don't have any pieces, don't do any preemptive
// unchoking at all.
if (t->num_have() > 0)
{
// if the peer is ignoring unchoke slots, or if we have enough
// unused slots, unchoke this peer right away, to save a round-trip
// in case it's interested.
maybe_unchoke_this_peer();
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}
}
}
boost::optional<piece_block_progress> bt_peer_connection::downloading_piece_progress() const
{
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
buffer::const_interval recv_buffer = m_recv_buffer.get();
// are we currently receiving a 'piece' message?
if (m_state != read_packet
|| recv_buffer.left() <= 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 = m_recv_buffer.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.left() - 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_LOGGING
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peer_log("<== KEEPALIVE");
#endif
incoming_keepalive();
}
// -----------------------------
// ----------- CHOKE -----------
// -----------------------------
void bt_peer_connection::on_choke(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
received_bytes(0, received);
if (m_recv_buffer.packet_size() != 1)
{
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disconnect(errors::invalid_choke, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
incoming_choke();
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if (is_disconnecting()) return;
if (!m_supports_fast)
{
// we just got choked, and the peer that choked use
// doesn't support fast extensions, so we have to
// assume that the choke message implies that all
// of our requests are rejected. Go through them and
// pretend that we received reject request messages
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
while (!download_queue().empty())
{
piece_block const& b = download_queue().front().block;
peer_request r;
r.piece = b.piece_index;
r.start = b.block_index * t->block_size();
r.length = t->block_size();
// if it's the last piece, make sure to
// set the length of the request to not
// exceed the end of the torrent. This is
// necessary in order to maintain a correct
// m_outsanding_bytes
if (r.piece == t->torrent_file().num_pieces() - 1)
{
r.length = (std::min)(t->torrent_file().piece_size(
r.piece) - r.start, r.length);
}
incoming_reject_request(r);
}
}
}
// -----------------------------
// ---------- UNCHOKE ----------
// -----------------------------
void bt_peer_connection::on_unchoke(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
received_bytes(0, received);
if (m_recv_buffer.packet_size() != 1)
{
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disconnect(errors::invalid_unchoke, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
incoming_unchoke();
}
// -----------------------------
// -------- INTERESTED ---------
// -----------------------------
void bt_peer_connection::on_interested(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
received_bytes(0, received);
if (m_recv_buffer.packet_size() != 1)
{
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disconnect(errors::invalid_interested, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
incoming_interested();
}
// -----------------------------
// ------ NOT INTERESTED -------
// -----------------------------
void bt_peer_connection::on_not_interested(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
received_bytes(0, received);
if (m_recv_buffer.packet_size() != 1)
{
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disconnect(errors::invalid_not_interested, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
incoming_not_interested();
}
// -----------------------------
// ----------- HAVE ------------
// -----------------------------
void bt_peer_connection::on_have(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
received_bytes(0, received);
if (m_recv_buffer.packet_size() != 5)
{
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disconnect(errors::invalid_have, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
buffer::const_interval recv_buffer = m_recv_buffer.get();
const char* ptr = recv_buffer.begin + 1;
int index = detail::read_int32(ptr);
incoming_have(index);
}
// -----------------------------
// --------- BITFIELD ----------
// -----------------------------
void bt_peer_connection::on_bitfield(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
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received_bytes(0, received);
// if we don't have the metedata, we cannot
// verify the bitfield size
if (t->valid_metadata()
&& m_recv_buffer.packet_size() - 1 != (t->torrent_file().num_pieces() + 7) / 8)
{
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disconnect(errors::invalid_bitfield_size, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
buffer::const_interval recv_buffer = m_recv_buffer.get();
bitfield bits;
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bits.assign((char*)recv_buffer.begin + 1
, t->valid_metadata()?get_bitfield().size():(m_recv_buffer.packet_size()-1)*8);
incoming_bitfield(bits);
}
// -----------------------------
// ---------- REQUEST ----------
// -----------------------------
void bt_peer_connection::on_request(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
received_bytes(0, received);
if (m_recv_buffer.packet_size() != 13)
{
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disconnect(errors::invalid_request, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
buffer::const_interval recv_buffer = m_recv_buffer.get();
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);
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incoming_request(r);
}
// -----------------------------
// ----------- PIECE -----------
// -----------------------------
void bt_peer_connection::on_piece(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
buffer::const_interval recv_buffer = m_recv_buffer.get();
int recv_pos = m_recv_buffer.pos(); // recv_buffer.end - recv_buffer.begin;
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
bool merkle = (unsigned char)recv_buffer.begin[0] == 250;
if (merkle)
{
if (recv_pos == 1)
{
m_recv_buffer.set_soft_packet_size(13);
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received_bytes(0, received);
return;
}
if (recv_pos < 13)
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{
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received_bytes(0, received);
return;
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}
if (recv_pos == 13)
{
const char* ptr = recv_buffer.begin + 9;
int list_size = detail::read_int32(ptr);
// now we know how long the bencoded hash list is
// and we can allocate the disk buffer and receive
// into it
if (list_size > m_recv_buffer.packet_size() - 13)
{
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disconnect(errors::invalid_hash_list, op_bittorrent, 2);
return;
}
if (m_recv_buffer.packet_size() - 13 - list_size > t->block_size())
{
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disconnect(errors::packet_too_large, op_bittorrent, 2);
return;
}
m_recv_buffer.assert_no_disk_buffer();
if (!m_settings.get_bool(settings_pack::contiguous_recv_buffer) &&
m_recv_buffer.can_recv_contiguous(m_recv_buffer.packet_size() - 13 - list_size))
{
if (!allocate_disk_receive_buffer(m_recv_buffer.packet_size() - 13 - list_size))
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{
received_bytes(0, received);
return;
}
}
}
}
else
{
if (recv_pos == 1)
{
m_recv_buffer.assert_no_disk_buffer();
if (m_recv_buffer.packet_size() - 9 > t->block_size())
{
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disconnect(errors::packet_too_large, op_bittorrent, 2);
return;
}
if (!m_settings.get_bool(settings_pack::contiguous_recv_buffer) &&
m_recv_buffer.can_recv_contiguous(m_recv_buffer.packet_size() - 9))
{
if (!allocate_disk_receive_buffer(m_recv_buffer.packet_size() - 9))
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{
received_bytes(0, received);
return;
}
}
}
}
TORRENT_ASSERT(m_settings.get_bool(settings_pack::contiguous_recv_buffer) || m_recv_buffer.has_disk_buffer() || m_recv_buffer.packet_size() == 9);
// classify the received data as protocol chatter
// or data payload for the statistics
int piece_bytes = 0;
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int header_size = merkle?13:9;
peer_request p;
int list_size = 0;
if (recv_pos >= header_size)
{
const char* ptr = recv_buffer.begin + 1;
p.piece = detail::read_int32(ptr);
p.start = detail::read_int32(ptr);
if (merkle)
{
list_size = detail::read_int32(ptr);
p.length = m_recv_buffer.packet_size() - list_size - header_size;
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header_size += list_size;
}
else
{
p.length = m_recv_buffer.packet_size() - header_size;
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}
}
if (recv_pos <= header_size)
{
// only received protocol data
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received_bytes(0, received);
}
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else if (recv_pos - received >= header_size)
{
// only received payload data
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received_bytes(received, 0);
piece_bytes = received;
}
else
{
// received a bit of both
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TORRENT_ASSERT(recv_pos - received < header_size);
TORRENT_ASSERT(recv_pos > header_size);
TORRENT_ASSERT(header_size - (recv_pos - received) <= header_size);
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received_bytes(
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recv_pos - header_size
, header_size - (recv_pos - received));
piece_bytes = recv_pos - header_size;
}
if (recv_pos < header_size) return;
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
// peer_log("<== PIECE_FRAGMENT p: %d start: %d length: %d"
// , p.piece, p.start, p.length);
#endif
if (recv_pos - received < header_size && recv_pos >= header_size)
{
// call this once, the first time the entire header
// has been received
start_receive_piece(p);
if (is_disconnecting()) return;
}
TORRENT_ASSERT(m_settings.get_bool(settings_pack::contiguous_recv_buffer) || m_recv_buffer.has_disk_buffer() || m_recv_buffer.packet_size() == header_size);
incoming_piece_fragment(piece_bytes);
if (!m_recv_buffer.packet_finished()) return;
if (merkle && list_size > 0)
{
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("<== HASHPIECE [ piece: %d list: %d ]", p.piece, list_size);
#endif
lazy_entry hash_list;
error_code ec;
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if (lazy_bdecode(recv_buffer.begin + 13, recv_buffer.begin+ 13 + list_size
, hash_list, ec) != 0)
{
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disconnect(errors::invalid_hash_piece, op_bittorrent, 2);
return;
}
// the list has this format:
// [ [node-index, hash], [node-index, hash], ... ]
if (hash_list.type() != lazy_entry::list_t)
{
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disconnect(errors::invalid_hash_list, op_bittorrent, 2);
return;
}
std::map<int, sha1_hash> nodes;
for (int i = 0; i < hash_list.list_size(); ++i)
{
lazy_entry const* e = hash_list.list_at(i);
if (e->type() != lazy_entry::list_t
|| e->list_size() != 2
|| e->list_at(0)->type() != lazy_entry::int_t
|| e->list_at(1)->type() != lazy_entry::string_t
|| e->list_at(1)->string_length() != 20) continue;
nodes.insert(std::make_pair(int(e->list_int_value_at(0))
, sha1_hash(e->list_at(1)->string_ptr())));
}
if (!nodes.empty() && !t->add_merkle_nodes(nodes, p.piece))
{
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disconnect(errors::invalid_hash_piece, op_bittorrent, 2);
return;
}
}
char* disk_buffer = m_recv_buffer.release_disk_buffer();
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if (disk_buffer)
{
disk_buffer_holder holder(m_allocator, disk_buffer);
incoming_piece(p, holder);
}
else
{
incoming_piece(p, recv_buffer.begin + header_size);
}
}
// -----------------------------
// ---------- CANCEL -----------
// -----------------------------
void bt_peer_connection::on_cancel(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
received_bytes(0, received);
if (m_recv_buffer.packet_size() != 13)
{
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disconnect(errors::invalid_cancel, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
buffer::const_interval recv_buffer = m_recv_buffer.get();
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);
incoming_cancel(r);
}
// -----------------------------
// --------- DHT PORT ----------
// -----------------------------
void bt_peer_connection::on_dht_port(int received)
{
INVARIANT_CHECK;
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TORRENT_ASSERT(received >= 0);
received_bytes(0, received);
if (m_recv_buffer.packet_size() != 3)
{
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disconnect(errors::invalid_dht_port, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
buffer::const_interval recv_buffer = m_recv_buffer.get();
const char* ptr = recv_buffer.begin + 1;
int listen_port = detail::read_uint16(ptr);
incoming_dht_port(listen_port);
if (!m_supports_dht_port)
{
m_supports_dht_port = true;
#ifndef TORRENT_DISABLE_DHT
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if (m_supports_dht_port && m_ses.has_dht())
write_dht_port(m_ses.external_udp_port());
#endif
}
}
void bt_peer_connection::on_suggest_piece(int received)
{
INVARIANT_CHECK;
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received_bytes(0, received);
if (!m_supports_fast)
{
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disconnect(errors::invalid_suggest, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
buffer::const_interval recv_buffer = m_recv_buffer.get();
const char* ptr = recv_buffer.begin + 1;
int piece = detail::read_uint32(ptr);
incoming_suggest(piece);
}
void bt_peer_connection::on_have_all(int received)
{
INVARIANT_CHECK;
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received_bytes(0, received);
if (!m_supports_fast)
{
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disconnect(errors::invalid_have_all, op_bittorrent, 2);
return;
}
incoming_have_all();
}
void bt_peer_connection::on_have_none(int received)
{
INVARIANT_CHECK;
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received_bytes(0, received);
if (!m_supports_fast)
{
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disconnect(errors::invalid_have_none, op_bittorrent, 2);
return;
}
incoming_have_none();
}
void bt_peer_connection::on_reject_request(int received)
{
INVARIANT_CHECK;
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received_bytes(0, received);
if (!m_supports_fast)
{
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disconnect(errors::invalid_reject, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
buffer::const_interval recv_buffer = m_recv_buffer.get();
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);
incoming_reject_request(r);
}
void bt_peer_connection::on_allowed_fast(int received)
{
INVARIANT_CHECK;
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received_bytes(0, received);
if (!m_supports_fast)
{
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disconnect(errors::invalid_allow_fast, op_bittorrent, 2);
return;
}
if (!m_recv_buffer.packet_finished()) return;
buffer::const_interval recv_buffer = m_recv_buffer.get();
const char* ptr = recv_buffer.begin + 1;
int index = detail::read_int32(ptr);
incoming_allowed_fast(index);
}
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// -----------------------------
// -------- RENDEZVOUS ---------
// -----------------------------
2011-01-29 13:13:49 +01:00
#ifndef TORRENT_DISABLE_EXTENSIONS
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void bt_peer_connection::on_holepunch()
{
INVARIANT_CHECK;
if (!m_recv_buffer.packet_finished()) return;
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// we can't accept holepunch messages from peers
// that don't support the holepunch extension
// because we wouldn't be able to respond
if (m_holepunch_id == 0) return;
buffer::const_interval recv_buffer = m_recv_buffer.get();
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TORRENT_ASSERT(*recv_buffer.begin == msg_extended);
++recv_buffer.begin;
TORRENT_ASSERT(*recv_buffer.begin == holepunch_msg);
++recv_buffer.begin;
const char* ptr = recv_buffer.begin;
// ignore invalid messages
if (recv_buffer.left() < 2) return;
int msg_type = detail::read_uint8(ptr);
int addr_type = detail::read_uint8(ptr);
tcp::endpoint ep;
if (addr_type == 0)
{
if (recv_buffer.left() < 2 + 4 + 2) return;
// IPv4 address
ep = detail::read_v4_endpoint<tcp::endpoint>(ptr);
}
#if TORRENT_USE_IPV6
else if (addr_type == 1)
{
// IPv6 address
if (recv_buffer.left() < 2 + 18 + 2) return;
ep = detail::read_v6_endpoint<tcp::endpoint>(ptr);
}
#endif
else
{
#if defined TORRENT_LOGGING
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error_code ec;
static const char* hp_msg_name[] = {"rendezvous", "connect", "failed"};
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peer_log("<== HOLEPUNCH [ msg: %s from %s to: unknown address type ]"
, (msg_type >= 0 && msg_type < 3 ? hp_msg_name[msg_type] : "unknown message type")
, print_address(remote().address()).c_str());
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#endif
return; // unknown address type
}
boost::shared_ptr<torrent> t = associated_torrent().lock();
if (!t) return;
switch (msg_type)
{
case hp_rendezvous: // rendezvous
{
#if defined TORRENT_LOGGING
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peer_log("<== HOLEPUNCH [ msg: rendezvous to: %s ]"
, print_address(ep.address()).c_str());
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#endif
// this peer is asking us to introduce it to
// the peer at 'ep'. We need to find which of
// our connections points to that endpoint
bt_peer_connection* p = t->find_peer(ep);
if (p == 0)
{
// we're not connected to this peer
write_holepunch_msg(hp_failed, ep, hp_not_connected);
break;
}
if (!p->supports_holepunch())
{
write_holepunch_msg(hp_failed, ep, hp_no_support);
break;
}
if (p == this)
{
write_holepunch_msg(hp_failed, ep, hp_no_self);
break;
}
write_holepunch_msg(hp_connect, ep, 0);
p->write_holepunch_msg(hp_connect, remote(), 0);
} break;
case hp_connect:
{
// add or find the peer with this endpoint
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torrent_peer* p = t->add_peer(ep, peer_info::pex);
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if (p == 0 || p->connection)
{
#if defined TORRENT_LOGGING
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peer_log("<== HOLEPUNCH [ msg:connect to: %s error: failed to add peer ]"
, print_address(ep.address()).c_str());
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#endif
// we either couldn't add this peer, or it's
// already connected. Just ignore the connect message
break;
}
if (p->banned)
{
#if defined TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("<== HOLEPUNCH [ msg:connect to: %s error: peer banned ]"
, print_address(ep.address()).c_str());
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#endif
// this peer is banned, don't connect to it
break;
}
// to make sure we use the uTP protocol
p->supports_utp = true;
// #error make sure we make this a connection candidate
// in case it has too many failures for instance
t->connect_to_peer(p, true);
// mark this connection to be in holepunch mode
// so that it will retry faster and stick to uTP while it's
// retrying
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t->update_want_peers();
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if (p->connection)
p->connection->set_holepunch_mode();
#if defined TORRENT_LOGGING
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peer_log("<== HOLEPUNCH [ msg:connect to: %s ]"
, print_address(ep.address()).c_str());
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#endif
} break;
case hp_failed:
{
boost::uint32_t error = detail::read_uint32(ptr);
#if defined TORRENT_LOGGING
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error_code ec;
char const* err_msg[] = {"no such peer", "not connected", "no support", "no self"};
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peer_log("<== HOLEPUNCH [ msg:failed error: %d msg: %s ]", error
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, ((error > 0 && error < 5)?err_msg[error-1]:"unknown message id"));
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#endif
// #error deal with holepunch errors
(void)error;
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} break;
#if defined TORRENT_LOGGING
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default:
{
error_code ec;
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peer_log("<== HOLEPUNCH [ msg: unknown message type (%d) to: %s ]"
, msg_type, print_address(ep.address()).c_str());
2010-11-29 02:33:05 +01:00
}
#endif
}
}
void bt_peer_connection::write_holepunch_msg(int type, tcp::endpoint const& ep, int error)
{
char buf[35];
char* ptr = buf + 6;
detail::write_uint8(type, ptr);
if (ep.address().is_v4()) detail::write_uint8(0, ptr);
else detail::write_uint8(1, ptr);
detail::write_endpoint(ep, ptr);
#if defined TORRENT_LOGGING
2010-11-29 02:33:05 +01:00
error_code ec;
static const char* hp_msg_name[] = {"rendezvous", "connect", "failed"};
static const char* hp_error_string[] = {"", "no such peer", "not connected", "no support", "no self"};
2010-12-01 05:22:03 +01:00
peer_log("==> HOLEPUNCH [ msg: %s to: %s error: %s ]"
, (type >= 0 && type < 3 ? hp_msg_name[type] : "unknown message type")
, print_address(ep.address()).c_str()
, hp_error_string[error]);
2010-11-29 02:33:05 +01:00
#endif
if (type == hp_failed)
{
detail::write_uint32(error, ptr);
}
// write the packet length and type
char* hdr = buf;
detail::write_uint32(ptr - buf - 4, hdr);
detail::write_uint8(msg_extended, hdr);
detail::write_uint8(m_holepunch_id, hdr);
TORRENT_ASSERT(ptr <= buf + sizeof(buf));
send_buffer(buf, ptr - buf);
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stats_counters().inc_stats_counter(counters::num_outgoing_extended);
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}
2011-01-29 13:13:49 +01:00
#endif // TORRENT_DISABLE_EXTENSIONS
2010-11-29 02:33:05 +01:00
// -----------------------------
// --------- EXTENDED ----------
// -----------------------------
#ifndef TORRENT_DISABLE_EXTENSIONS
void bt_peer_connection::on_extended(int received)
{
INVARIANT_CHECK;
2014-07-06 21:18:00 +02:00
TORRENT_ASSERT(received >= 0);
received_bytes(0, received);
if (m_recv_buffer.packet_size() < 2)
{
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_extended, op_bittorrent, 2);
return;
}
if (associated_torrent().expired())
{
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_extended, op_bittorrent, 2);
return;
}
buffer::const_interval recv_buffer = m_recv_buffer.get();
if (recv_buffer.left() < 2) return;
TORRENT_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();
disconnect_if_redundant();
return;
}
2010-11-29 02:33:05 +01:00
if (extended_id == upload_only_msg)
{
if (!m_recv_buffer.packet_finished()) return;
if (m_recv_buffer.packet_size() != 3)
{
#ifdef TORRENT_LOGGING
peer_log("<== UPLOAD_ONLY [ ERROR: unexpected packet size: %d ]", m_recv_buffer.packet_size());
#endif
return;
}
bool ul = detail::read_uint8(recv_buffer.begin) != 0;
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("<== UPLOAD_ONLY [ %s ]", (ul?"true":"false"));
2010-11-29 02:33:05 +01:00
#endif
set_upload_only(ul);
return;
}
if (extended_id == share_mode_msg)
{
if (!m_recv_buffer.packet_finished()) return;
if (m_recv_buffer.packet_size() != 3)
{
#ifdef TORRENT_LOGGING
peer_log("<== SHARE_MODE [ ERROR: unexpected packet size: %d ]", m_recv_buffer.packet_size());
#endif
return;
}
bool sm = detail::read_uint8(recv_buffer.begin) != 0;
#ifdef TORRENT_LOGGING
peer_log("<== SHARE_MODE [ %s ]", (sm?"true":"false"));
#endif
set_share_mode(sm);
return;
}
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if (extended_id == holepunch_msg)
{
if (!m_recv_buffer.packet_finished()) return;
#ifdef TORRENT_LOGGING
peer_log("<== HOLEPUNCH");
#endif
2010-11-29 02:33:05 +01:00
on_holepunch();
return;
}
if (extended_id == dont_have_msg)
{
if (!m_recv_buffer.packet_finished()) return;
if (m_recv_buffer.packet_size() != 6)
{
#ifdef TORRENT_LOGGING
peer_log("<== DONT_HAVE [ ERROR: unexpected packet size: %d ]", m_recv_buffer.packet_size());
#endif
return;
}
2014-09-04 10:55:24 +02:00
int piece = detail::read_uint32(recv_buffer.begin);
incoming_dont_have(piece);
return;
}
#ifdef TORRENT_LOGGING
if (m_recv_buffer.packet_finished())
2010-12-01 05:22:03 +01:00
peer_log("<== EXTENSION MESSAGE [ msg: %d size: %d ]"
, extended_id, m_recv_buffer.packet_size());
2010-11-29 02:33:05 +01:00
#endif
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
if ((*i)->on_extended(m_recv_buffer.packet_size() - 2, extended_id
, recv_buffer))
return;
}
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_message, op_bittorrent, 2);
return;
}
void bt_peer_connection::on_extended_handshake()
{
if (!m_recv_buffer.packet_finished()) return;
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
buffer::const_interval recv_buffer = m_recv_buffer.get();
lazy_entry root;
error_code ec;
int pos;
int ret = lazy_bdecode(recv_buffer.begin + 2, recv_buffer.end, root, ec, &pos);
if (ret != 0 || ec || root.type() != lazy_entry::dict_t)
{
#ifdef TORRENT_LOGGING
2010-12-19 20:40:32 +01:00
peer_log("*** invalid extended handshake: %s pos: %d"
2010-12-01 05:22:03 +01:00
, ec.message().c_str(), pos);
#endif
return;
}
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("<== EXTENDED HANDSHAKE: %s", print_entry(root).c_str());
#endif
2008-07-01 22:22:25 +02:00
for (extension_list_t::iterator i = m_extensions.begin();
!m_extensions.empty() && i != m_extensions.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;
}
2008-10-23 18:31:15 +02:00
if (is_disconnecting()) return;
2009-11-24 19:49:59 +01:00
// upload_only
if (lazy_entry const* m = root.dict_find_dict("m"))
2010-11-29 02:33:05 +01:00
{
m_upload_only_id = boost::uint8_t(m->dict_find_int_value("upload_only", 0));
m_holepunch_id = boost::uint8_t(m->dict_find_int_value("ut_holepunch", 0));
m_dont_have_id = boost::uint8_t(m->dict_find_int_value("lt_donthave", 0));
2010-11-29 02:33:05 +01:00
}
2009-11-24 19:49:59 +01:00
// there is supposed to be a remote listen port
int listen_port = int(root.dict_find_int_value("p"));
if (listen_port > 0 && peer_info_struct() != 0)
{
2014-07-06 21:18:00 +02:00
t->update_peer_port(listen_port, peer_info_struct(), peer_info::incoming);
received_listen_port();
if (is_disconnecting()) return;
}
// there should be a version too
// but where do we put that info?
2010-03-19 19:39:51 +01:00
int last_seen_complete = boost::uint8_t(root.dict_find_int_value("complete_ago", -1));
2010-03-19 19:39:51 +01:00
if (last_seen_complete >= 0) set_last_seen_complete(last_seen_complete);
std::string client_info = root.dict_find_string_value("v");
if (!client_info.empty()) m_client_version = client_info;
int reqq = int(root.dict_find_int_value("reqq"));
if (reqq > 0) max_out_request_queue(reqq);
2009-11-24 19:49:59 +01:00
if (root.dict_find_int_value("upload_only", 0))
set_upload_only(true);
2008-05-18 07:59:47 +02:00
2014-07-06 21:18:00 +02:00
if (m_settings.get_bool(settings_pack::support_share_mode)
&& root.dict_find_int_value("share_mode", 0))
2010-09-05 18:01:36 +02:00
set_share_mode(true);
std::string myip = root.dict_find_string_value("yourip");
if (!myip.empty())
{
if (myip.size() == address_v4::bytes_type().size())
{
address_v4::bytes_type bytes;
std::copy(myip.begin(), myip.end(), bytes.begin());
m_ses.set_external_address(address_v4(bytes)
2014-07-06 21:18:00 +02:00
, aux::session_interface::source_peer, remote().address());
}
2009-11-27 19:46:29 +01:00
#if TORRENT_USE_IPV6
else if (myip.size() == address_v6::bytes_type().size())
{
address_v6::bytes_type bytes;
std::copy(myip.begin(), myip.end(), bytes.begin());
address_v6 ipv6_address(bytes);
if (ipv6_address.is_v4_mapped())
m_ses.set_external_address(ipv6_address.to_v4()
2014-07-06 21:18:00 +02:00
, aux::session_interface::source_peer, remote().address());
else
m_ses.set_external_address(ipv6_address
2014-07-06 21:18:00 +02:00
, aux::session_interface::source_peer, remote().address());
}
2009-11-27 19:46:29 +01:00
#endif
}
2008-05-18 07:59:47 +02:00
// if we're finished and this peer is uploading only
// disconnect it
2010-09-05 06:31:13 +02:00
if (t->is_finished() && upload_only()
2014-07-06 21:18:00 +02:00
&& m_settings.get_bool(settings_pack::close_redundant_connections)
2010-09-05 18:01:36 +02:00
&& !t->share_mode())
2014-07-06 21:18:00 +02:00
disconnect(errors::upload_upload_connection, op_bittorrent);
stats_counters().inc_stats_counter(counters::num_incoming_ext_handshake);
}
#endif // TORRENT_DISABLE_EXTENSIONS
bool bt_peer_connection::dispatch_message(int received)
{
INVARIANT_CHECK;
2014-07-06 21:18:00 +02:00
TORRENT_ASSERT(received >= 0);
// this means the connection has been closed already
if (associated_torrent().expired())
{
2014-07-06 21:18:00 +02:00
received_bytes(0, received);
return false;
}
buffer::const_interval recv_buffer = m_recv_buffer.get();
TORRENT_ASSERT(recv_buffer.left() >= 1);
int packet_type = (unsigned char)recv_buffer[0];
2014-07-06 21:18:00 +02:00
if (m_settings.get_bool(settings_pack::support_merkle_torrents)
&& packet_type == 250) packet_type = msg_piece;
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(m_recv_buffer.packet_size(), packet_type
, buffer::const_interval(recv_buffer.begin+1
, recv_buffer.end)))
return m_recv_buffer.packet_finished();
}
#endif
2014-07-06 21:18:00 +02:00
received_bytes(0, received);
// What's going on here?!
// break in debug builds to allow investigation
// TORRENT_ASSERT(false);
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_message, op_bittorrent);
return m_recv_buffer.packet_finished();
}
TORRENT_ASSERT(m_message_handler[packet_type] != 0);
#ifdef TORRENT_DEBUG
boost::int64_t cur_payload_dl = statistics().last_payload_downloaded();
boost::int64_t cur_protocol_dl = statistics().last_protocol_downloaded();
#endif
2014-07-06 21:18:00 +02:00
// call the correct handler for this packet type
(this->*m_message_handler[packet_type])(received);
#ifdef TORRENT_DEBUG
2014-07-06 21:18:00 +02:00
TORRENT_ASSERT(statistics().last_payload_downloaded() - cur_payload_dl >= 0);
TORRENT_ASSERT(statistics().last_protocol_downloaded() - cur_protocol_dl >= 0);
boost::int64_t stats_diff = statistics().last_payload_downloaded() - cur_payload_dl +
2014-07-06 21:18:00 +02:00
statistics().last_protocol_downloaded() - cur_protocol_dl;
TORRENT_ASSERT(stats_diff == received);
#endif
bool finished = m_recv_buffer.packet_finished();
2014-07-06 21:18:00 +02:00
if (finished)
{
// count this packet in the session stats counters
int counter = counters::num_incoming_extended;
if (packet_type <= msg_dht_port)
counter = counters::num_incoming_choke + packet_type;
else if (packet_type <= msg_allowed_fast)
counter = counters::num_incoming_suggest + packet_type;
else if (packet_type <= msg_extended)
counter = counters::num_incoming_extended;
else
TORRENT_ASSERT(false);
stats_counters().inc_stats_counter(counter);
2014-07-06 21:18:00 +02:00
}
return finished;
}
2009-11-24 19:49:59 +01:00
#ifndef TORRENT_DISABLE_EXTENSIONS
void bt_peer_connection::write_upload_only()
{
INVARIANT_CHECK;
boost::shared_ptr<torrent> t = associated_torrent().lock();
if (m_upload_only_id == 0) return;
2010-09-05 18:01:36 +02:00
if (t->share_mode()) return;
2009-11-24 19:49:59 +01:00
// if we send upload-only, the other end is very likely to disconnect
// us, at least if it's a seed. If we don't want to close redundant
// connections, don't sent upload-only
2014-07-06 21:18:00 +02:00
if (!m_settings.get_bool(settings_pack::close_redundant_connections)) return;
#ifdef TORRENT_LOGGING
peer_log("==> UPLOAD_ONLY [ %d ]"
, int(t->is_upload_only() && !t->super_seeding()));
#endif
2009-11-24 19:49:59 +01:00
char msg[7] = {0, 0, 0, 3, msg_extended};
char* ptr = msg + 5;
detail::write_uint8(m_upload_only_id, ptr);
// if we're super seeding, we don't want to make peers
// think that we only have a single piece and is upload
// only, since they might disconnect immediately when
// they have downloaded a single piece, although we'll
// make another piece available
detail::write_uint8(t->is_upload_only() && !t->super_seeding(), ptr);
2009-11-24 19:49:59 +01:00
send_buffer(msg, sizeof(msg));
2014-07-06 21:18:00 +02:00
stats_counters().inc_stats_counter(counters::num_outgoing_extended);
2009-11-24 19:49:59 +01:00
}
2010-09-05 18:01:36 +02:00
void bt_peer_connection::write_share_mode()
{
INVARIANT_CHECK;
boost::shared_ptr<torrent> t = associated_torrent().lock();
if (m_share_mode_id == 0) return;
char msg[7] = {0, 0, 0, 3, msg_extended};
char* ptr = msg + 5;
detail::write_uint8(m_share_mode_id, ptr);
detail::write_uint8(t->share_mode(), ptr);
send_buffer(msg, sizeof(msg));
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stats_counters().inc_stats_counter(counters::num_outgoing_extended);
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}
2009-11-24 19:49:59 +01:00
#endif
void bt_peer_connection::write_keepalive()
{
INVARIANT_CHECK;
2007-11-19 08:07:57 +01:00
// Don't require the bitfield to have been sent at this point
// the case where m_sent_bitfield may not be true is if the
// torrent doesn't have any metadata, and a peer is timimg out.
// then the keep-alive message will be sent before the bitfield
// this is a violation to the original protocol, but necessary
// for the metadata extension.
TORRENT_ASSERT(m_sent_handshake);
char msg[] = {0,0,0,0};
send_buffer(msg, sizeof(msg));
}
void bt_peer_connection::write_cancel(peer_request const& r)
{
INVARIANT_CHECK;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
TORRENT_ASSERT(associated_torrent().lock()->valid_metadata());
char msg[17] = {0,0,0,13, msg_cancel};
char* ptr = msg + 5;
detail::write_int32(r.piece, ptr); // index
detail::write_int32(r.start, ptr); // begin
detail::write_int32(r.length, ptr); // length
send_buffer(msg, sizeof(msg));
stats_counters().inc_stats_counter(counters::num_outgoing_cancel);
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if (!m_supports_fast)
incoming_reject_request(r);
}
void bt_peer_connection::write_request(peer_request const& r)
{
INVARIANT_CHECK;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
TORRENT_ASSERT(associated_torrent().lock()->valid_metadata());
char msg[17] = {0,0,0,13, msg_request};
char* ptr = msg + 5;
detail::write_int32(r.piece, ptr); // index
detail::write_int32(r.start, ptr); // begin
detail::write_int32(r.length, ptr); // length
send_buffer(msg, sizeof(msg), message_type_request);
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stats_counters().inc_stats_counter(counters::num_outgoing_request);
}
void bt_peer_connection::write_bitfield()
{
INVARIANT_CHECK;
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
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TORRENT_ASSERT(m_sent_handshake);
TORRENT_ASSERT(t->valid_metadata());
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if (t->super_seeding())
{
#ifdef TORRENT_LOGGING
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peer_log(" *** NOT SENDING BITFIELD, super seeding");
#endif
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if (m_supports_fast) write_have_none();
// if we are super seeding, pretend to not have any piece
// and don't send a bitfield
m_sent_bitfield = true;
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// bootstrap superseeding by sending two have message
2014-03-19 05:34:24 +01:00
int piece = t->get_piece_to_super_seed(get_bitfield());
if (piece >= 0) superseed_piece(-1, piece);
piece = t->get_piece_to_super_seed(get_bitfield());
if (piece >= 0) superseed_piece(-1, piece);
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return;
}
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else if (m_supports_fast && t->is_seed() && !m_settings.get_bool(settings_pack::lazy_bitfields))
{
write_have_all();
send_allowed_set();
return;
}
else if (m_supports_fast && t->num_have() == 0)
{
write_have_none();
send_allowed_set();
return;
}
else if (t->num_have() == 0)
{
// don't send a bitfield if we don't have any pieces
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log(" *** NOT SENDING BITFIELD");
#endif
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m_sent_bitfield = true;
return;
}
int num_pieces = t->torrent_file().num_pieces();
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2007-05-27 00:27:40 +02:00
int lazy_pieces[50];
int num_lazy_pieces = 0;
int lazy_piece = 0;
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if (t->is_seed() && m_settings.get_bool(settings_pack::lazy_bitfields)
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
2010-02-25 20:19:12 +01:00
&& !m_encrypted
#endif
)
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{
num_lazy_pieces = (std::min)(50, num_pieces / 10);
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if (num_lazy_pieces < 1) num_lazy_pieces = 1;
for (int i = 0; i < num_pieces; ++i)
{
if (int(random() % (num_pieces - i)) >= num_lazy_pieces - lazy_piece) continue;
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lazy_pieces[lazy_piece++] = i;
}
TORRENT_ASSERT(lazy_piece == num_lazy_pieces);
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}
const int packet_size = (num_pieces + 7) / 8 + 5;
char* msg = TORRENT_ALLOCA(char, packet_size);
if (msg == 0) return; // out of memory
unsigned char* ptr = (unsigned char*)msg;
detail::write_int32(packet_size - 4, ptr);
detail::write_uint8(msg_bitfield, ptr);
if (t->is_seed())
{
memset(ptr, 0xff, packet_size - 5);
// Clear trailing bits
unsigned char *p = ((unsigned char *)msg) + packet_size - 1;
*p = (0xff << ((8 - (num_pieces & 7)) & 7)) & 0xff;
}
else
{
memset(ptr, 0, packet_size - 5);
piece_picker const& p = t->picker();
int mask = 0x80;
for (int i = 0; i < num_pieces; ++i)
{
if (p.have_piece(i)) *ptr |= mask;
mask >>= 1;
if (mask == 0)
{
mask = 0x80;
++ptr;
}
}
}
for (int c = 0; c < num_lazy_pieces; ++c)
msg[5 + lazy_pieces[c] / 8] &= ~(0x80 >> (lazy_pieces[c] & 7));
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// add predictive pieces to the bitfield as well, since we won't
// announce them again
for (std::vector<int>::const_iterator i = t->predictive_pieces().begin()
, end(t->predictive_pieces().end()); i != end; ++i)
msg[5 + *i / 8] |= (0x80 >> (*i & 7));
#ifdef TORRENT_LOGGING
std::string bitfield_string;
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bitfield_string.resize(num_pieces);
for (int k = 0; k < num_pieces; ++k)
{
if (msg[5 + k / 8] & (0x80 >> (k % 8))) bitfield_string[k] = '1';
2009-04-04 11:52:25 +02:00
else bitfield_string[k] = '0';
}
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peer_log("==> BITFIELD [ %s ]", bitfield_string.c_str());
#endif
m_sent_bitfield = true;
send_buffer(msg, packet_size);
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stats_counters().inc_stats_counter(counters::num_outgoing_bitfield);
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2007-05-27 00:27:40 +02:00
if (num_lazy_pieces > 0)
{
for (int i = 0; i < num_lazy_pieces; ++i)
{
#ifdef TORRENT_LOGGING
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peer_log("==> HAVE [ piece: %d ]", lazy_pieces[i]);
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#endif
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write_have(lazy_pieces[i]);
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}
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// TODO: if we're finished, send upload_only message
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}
if (m_supports_fast)
send_allowed_set();
}
#ifndef TORRENT_DISABLE_EXTENSIONS
void bt_peer_connection::write_extensions()
{
INVARIANT_CHECK;
TORRENT_ASSERT(m_supports_extensions);
TORRENT_ASSERT(m_sent_handshake);
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entry handshake;
entry::dictionary_type& m = handshake["m"].dict();
// if we're using a proxy, our listen port won't be useful
// anyway.
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if (!m_settings.get_bool(settings_pack::force_proxy) && is_outgoing())
handshake["p"] = m_ses.listen_port();
// only send the port in case we bade the connection
// on incoming connections the other end already knows
// our listen port
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if (!m_settings.get_bool(settings_pack::anonymous_mode))
{
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handshake["v"] = m_settings.get_str(settings_pack::handshake_client_version).empty()
? m_settings.get_str(settings_pack::user_agent)
: m_settings.get_str(settings_pack::handshake_client_version);
}
std::string remote_address;
std::back_insert_iterator<std::string> out(remote_address);
detail::write_address(remote().address(), out);
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handshake["yourip"] = remote_address;
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handshake["reqq"] = m_settings.get_int(settings_pack::max_allowed_in_request_queue);
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boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
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m["upload_only"] = upload_only_msg;
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m["ut_holepunch"] = holepunch_msg;
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if (m_settings.get_bool(settings_pack::support_share_mode))
m["share_mode"] = share_mode_msg;
m["lt_donthave"] = dont_have_msg;
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2010-03-19 19:39:51 +01:00
int complete_ago = -1;
if (t->last_seen_complete() > 0) complete_ago = t->time_since_complete();
handshake["complete_ago"] = complete_ago;
2009-11-24 19:49:59 +01:00
2008-12-08 07:36:22 +01:00
// if we're using lazy bitfields or if we're super seeding, don't say
// we're upload only, since it might make peers disconnect. don't tell
// anyone we're upload only when in share mode, we want to stay connected
// to seeds. if we're super seeding, we don't want to make peers think
// that we only have a single piece and is upload only, since they might
// disconnect immediately when they have downloaded a single piece,
// although we'll make another piece available. If we don't have
// metadata, we also need to suppress saying we're upload-only. If we do,
// we may be disconnected before we receive the metadata.
if (t->is_upload_only()
&& !t->share_mode()
&& t->valid_metadata()
&& !t->super_seeding()
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&& (!m_settings.get_bool(settings_pack::lazy_bitfields)
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
2010-02-25 20:19:12 +01:00
|| m_encrypted
#endif
))
{
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handshake["upload_only"] = 1;
}
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if (m_settings.get_bool(settings_pack::support_share_mode)
&& t->share_mode())
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handshake["share_mode"] = 1;
// 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);
}
2010-11-29 02:33:05 +01:00
#ifndef NDEBUG
// make sure there are not conflicting extensions
std::set<int> ext;
for (entry::dictionary_type::const_iterator i = m.begin()
, end(m.end()); i != end; ++i)
{
if (i->second.type() != entry::int_t) continue;
int val = int(i->second.integer());
2010-11-29 02:33:05 +01:00
TORRENT_ASSERT(ext.find(val) == ext.end());
ext.insert(val);
}
#endif
std::vector<char> dict_msg;
bencode(std::back_inserter(dict_msg), handshake);
char msg[6];
char* ptr = msg;
// write the length of the message
detail::write_int32((int)dict_msg.size() + 2, ptr);
detail::write_uint8(msg_extended, ptr);
// signal handshake message
detail::write_uint8(0, ptr);
send_buffer(msg, sizeof(msg));
send_buffer(&dict_msg[0], dict_msg.size());
stats_counters().inc_stats_counter(counters::num_outgoing_ext_handshake);
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#if defined TORRENT_LOGGING
2013-12-20 07:43:57 +01:00
peer_log("==> EXTENDED HANDSHAKE: %s", handshake.to_string().c_str());
#endif
}
#endif
void bt_peer_connection::write_choke()
{
INVARIANT_CHECK;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
if (is_choked()) return;
char msg[] = {0,0,0,1,msg_choke};
send_buffer(msg, sizeof(msg));
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stats_counters().inc_stats_counter(counters::num_outgoing_choke);
}
void bt_peer_connection::write_unchoke()
{
INVARIANT_CHECK;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
char msg[] = {0,0,0,1,msg_unchoke};
send_buffer(msg, sizeof(msg));
stats_counters().inc_stats_counter(counters::num_outgoing_unchoke);
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#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
(*i)->sent_unchoke();
}
#endif
}
void bt_peer_connection::write_interested()
{
INVARIANT_CHECK;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
char msg[] = {0,0,0,1,msg_interested};
send_buffer(msg, sizeof(msg));
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stats_counters().inc_stats_counter(counters::num_outgoing_interested);
}
void bt_peer_connection::write_not_interested()
{
INVARIANT_CHECK;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
char msg[] = {0,0,0,1,msg_not_interested};
send_buffer(msg, sizeof(msg));
2014-07-06 21:18:00 +02:00
stats_counters().inc_stats_counter(counters::num_outgoing_not_interested);
}
void bt_peer_connection::write_have(int index)
{
2007-06-21 02:51:42 +02:00
INVARIANT_CHECK;
TORRENT_ASSERT(associated_torrent().lock()->valid_metadata());
TORRENT_ASSERT(index >= 0);
TORRENT_ASSERT(index < associated_torrent().lock()->torrent_file().num_pieces());
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
char msg[] = {0,0,0,5,msg_have,0,0,0,0};
char* ptr = msg + 5;
detail::write_int32(index, ptr);
send_buffer(msg, sizeof(msg));
2014-07-06 21:18:00 +02:00
stats_counters().inc_stats_counter(counters::num_outgoing_have);
2014-07-06 21:18:00 +02:00
}
void bt_peer_connection::write_dont_have(int index)
{
#ifndef TORRENT_DISABLE_EXTENSIONS
INVARIANT_CHECK;
TORRENT_ASSERT(associated_torrent().lock()->valid_metadata());
TORRENT_ASSERT(index >= 0);
TORRENT_ASSERT(index < associated_torrent().lock()->torrent_file().num_pieces());
if (in_handshake()) return;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
if (!m_supports_extensions || m_dont_have_id == 0) return;
char msg[] = {0,0,0,6,msg_extended,char(m_dont_have_id),0,0,0,0};
char* ptr = msg + 6;
detail::write_int32(index, ptr);
send_buffer(msg, sizeof(msg));
stats_counters().inc_stats_counter(counters::num_outgoing_extended);
2014-07-06 21:18:00 +02:00
#endif
}
2014-07-07 08:28:48 +02:00
void buffer_reclaim_block(char* /* buffer */, void* userdata
2014-07-06 21:18:00 +02:00
, block_cache_reference ref)
{
buffer_allocator_interface* buf = (buffer_allocator_interface*)userdata;
buf->reclaim_block(ref);
}
void buffer_free_disk_buf(char* buffer, void* userdata
2014-07-07 08:28:48 +02:00
, block_cache_reference /* ref */)
2014-07-06 21:18:00 +02:00
{
buffer_allocator_interface* buf = (buffer_allocator_interface*)userdata;
buf->free_disk_buffer(buffer);
}
void bt_peer_connection::write_piece(peer_request const& r, disk_buffer_holder& buffer)
{
INVARIANT_CHECK;
TORRENT_ASSERT(m_sent_handshake && m_sent_bitfield);
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
bool merkle = t->torrent_file().is_merkle_torrent() && r.start == 0;
// the hash piece looks like this:
// uint8_t msg
// uint32_t piece index
// uint32_t start
// uint32_t list len
// var bencoded list
// var piece data
char msg[4 + 1 + 4 + 4 + 4];
char* ptr = msg;
TORRENT_ASSERT(r.length <= 16 * 1024);
detail::write_int32(r.length + 1 + 4 + 4, ptr);
2014-07-06 21:18:00 +02:00
if (m_settings.get_bool(settings_pack::support_merkle_torrents) && merkle)
detail::write_uint8(250, ptr);
else
detail::write_uint8(msg_piece, ptr);
detail::write_int32(r.piece, ptr);
detail::write_int32(r.start, ptr);
// if this is a merkle torrent and the start offset
// is 0, we need to include the merkle node hashes
if (merkle)
{
std::vector<char> piece_list_buf;
entry piece_list;
entry::list_type& l = piece_list.list();
std::map<int, sha1_hash> merkle_node_list = t->torrent_file().build_merkle_list(r.piece);
for (std::map<int, sha1_hash>::iterator i = merkle_node_list.begin()
, end(merkle_node_list.end()); i != end; ++i)
{
l.push_back(entry(entry::list_t));
l.back().list().push_back(i->first);
l.back().list().push_back(i->second.to_string());
}
bencode(std::back_inserter(piece_list_buf), piece_list);
detail::write_int32(piece_list_buf.size(), ptr);
char* ptr = msg;
detail::write_int32(r.length + 1 + 4 + 4 + 4 + piece_list_buf.size(), ptr);
send_buffer(msg, 17);
send_buffer(&piece_list_buf[0], piece_list_buf.size());
}
else
{
send_buffer(msg, 13);
}
2014-07-06 21:18:00 +02:00
if (buffer.ref().storage == 0)
{
append_send_buffer(buffer.get(), r.length
, &buffer_free_disk_buf, &m_allocator);
}
else
{
append_const_send_buffer(buffer.get(), r.length
, &buffer_reclaim_block, &m_allocator, buffer.ref());
}
buffer.release();
m_payloads.push_back(range(send_buffer_size() - r.length, r.length));
setup_send();
stats_counters().inc_stats_counter(counters::num_outgoing_piece);
}
// --------------------------
// RECEIVE DATA
// --------------------------
2008-05-03 18:05:42 +02:00
void bt_peer_connection::on_receive(error_code const& error
, std::size_t bytes_transferred)
{
INVARIANT_CHECK;
if (error)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
return;
}
2014-07-06 21:18:00 +02:00
// make sure are much as possible of the response ends up in the same
// packet, or at least back-to-back packets
cork c_(*this);
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
if (!m_enc_handler.is_recv_plaintext())
{
int consumed = m_enc_handler.decrypt(m_recv_buffer, bytes_transferred);
#ifdef TORRENT_LOGGING
if (consumed + bytes_transferred > 0)
peer_log("<== decrypted block [ s = %d ]", consumed + bytes_transferred);
#endif
if (bytes_transferred == SIZE_MAX)
{
disconnect(errors::parse_failed, op_encryption);
return;
}
received_bytes(0, consumed);
int sub_transferred = 0;
while (bytes_transferred > 0 &&
((sub_transferred = m_recv_buffer.advance_pos(bytes_transferred)) > 0))
{
#if TORRENT_USE_ASSERTS
boost::int64_t cur_payload_dl = m_statistics.last_payload_downloaded();
boost::int64_t cur_protocol_dl = m_statistics.last_protocol_downloaded();
#endif
on_receive_impl(sub_transferred);
bytes_transferred -= sub_transferred;
TORRENT_ASSERT(sub_transferred > 0);
#if TORRENT_USE_ASSERTS
TORRENT_ASSERT(m_statistics.last_payload_downloaded() - cur_payload_dl >= 0);
TORRENT_ASSERT(m_statistics.last_protocol_downloaded() - cur_protocol_dl >= 0);
boost::int64_t stats_diff = m_statistics.last_payload_downloaded() - cur_payload_dl +
m_statistics.last_protocol_downloaded() - cur_protocol_dl;
TORRENT_ASSERT(stats_diff == int(sub_transferred));
#endif
if (m_disconnecting) return;
}
2007-06-06 02:41:20 +02:00
}
else
2007-06-06 02:41:20 +02:00
#endif
on_receive_impl(bytes_transferred);
}
2007-06-06 02:41:20 +02:00
void bt_peer_connection::on_receive_impl(std::size_t bytes_transferred)
{
boost::shared_ptr<torrent> t = associated_torrent().lock();
buffer::const_interval recv_buffer = m_recv_buffer.get();
2007-06-06 02:41:20 +02:00
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
2007-06-06 02:41:20 +02:00
// m_state is set to read_pe_dhkey in initial state
// (read_protocol_identifier) for incoming, or in constructor
// for outgoing
if (m_state == read_pe_dhkey)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
TORRENT_ASSERT(!m_encrypted);
TORRENT_ASSERT(!m_rc4_encrypted);
TORRENT_ASSERT(m_recv_buffer.packet_size() == dh_key_len);
TORRENT_ASSERT(recv_buffer == m_recv_buffer.get());
2007-06-06 02:41:20 +02:00
if (!m_recv_buffer.packet_finished()) return;
2007-06-06 02:41:20 +02:00
// write our dh public key. m_dh_key_exchange is
2007-06-06 02:41:20 +02:00
// initialized in write_pe1_2_dhkey()
if (!is_outgoing()) write_pe1_2_dhkey();
if (is_disconnecting()) return;
2007-06-06 02:41:20 +02:00
// read dh key, generate shared secret
2014-11-08 17:58:18 +01:00
if (m_dh_key_exchange->compute_secret(recv_buffer.begin) != 0)
{
2014-07-06 21:18:00 +02:00
disconnect(errors::no_memory, op_encryption);
return;
}
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("*** received DH key");
2007-06-06 02:41:20 +02:00
#endif
2007-06-06 02:41:20 +02:00
// PadA/B can be a max of 512 bytes, and 20 bytes more for
// the sync hash (if incoming), or 8 bytes more for the
// encrypted verification constant (if outgoing). Instead
// of requesting the maximum possible, request the maximum
// possible to ensure we do not overshoot the standard
// handshake.
if (is_outgoing())
2007-06-06 02:41:20 +02:00
{
m_state = read_pe_syncvc;
write_pe3_sync();
// initial payload is the standard handshake, this is
// always rc4 if sent here. m_rc4_encrypted is flagged
// again according to peer selection.
switch_send_crypto(m_rc4);
2014-07-06 21:18:00 +02:00
write_handshake(true);
switch_send_crypto(boost::shared_ptr<crypto_plugin>());
2007-06-06 02:41:20 +02:00
// vc,crypto_select,len(pad),pad, encrypt(handshake)
// 8+4+2+0+handshake_len
m_recv_buffer.reset(8+4+2+0+handshake_len);
2007-06-06 02:41:20 +02:00
}
else
{
// already written dh key
m_state = read_pe_synchash;
// synchash,skeyhash,vc,crypto_provide,len(pad),pad,encrypt(handshake)
m_recv_buffer.reset(20+20+8+4+2+0+handshake_len);
2007-06-06 02:41:20 +02:00
}
TORRENT_ASSERT(!m_recv_buffer.packet_finished());
2007-06-06 02:41:20 +02:00
return;
}
// cannot fall through into
if (m_state == read_pe_synchash)
{
TORRENT_ASSERT(!m_encrypted);
TORRENT_ASSERT(!m_rc4_encrypted);
TORRENT_ASSERT(!is_outgoing());
TORRENT_ASSERT(recv_buffer == m_recv_buffer.get());
if (recv_buffer.left() < 20)
2007-06-06 02:41:20 +02:00
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
if (m_recv_buffer.packet_finished())
2014-07-06 21:18:00 +02:00
disconnect(errors::sync_hash_not_found, op_bittorrent, 1);
2007-06-06 02:41:20 +02:00
return;
}
if (!m_sync_hash.get())
{
TORRENT_ASSERT(m_sync_bytes_read == 0);
2007-06-06 02:41:20 +02:00
hasher h;
// compute synchash (hash('req1',S))
h.update("req1", 4);
h.update(m_dh_key_exchange->get_secret(), dh_key_len);
m_sync_hash.reset(new (std::nothrow) sha1_hash(h.final()));
if (!m_sync_hash)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
disconnect(errors::no_memory, op_encryption);
return;
}
2007-06-06 02:41:20 +02:00
}
int syncoffset = get_syncoffset((char*)m_sync_hash->begin(), 20
, recv_buffer.begin, recv_buffer.left());
// No sync
if (syncoffset == -1)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
2007-06-06 02:41:20 +02:00
std::size_t bytes_processed = recv_buffer.left() - 20;
m_sync_bytes_read += bytes_processed;
if (m_sync_bytes_read >= 512)
{
2014-07-06 21:18:00 +02:00
disconnect(errors::sync_hash_not_found, op_encryption, 1);
return;
}
2007-06-06 02:41:20 +02:00
m_recv_buffer.cut(bytes_processed, (std::min)(m_recv_buffer.packet_size()
2008-08-21 01:05:12 +02:00
, (512+20) - m_sync_bytes_read));
2007-06-06 02:41:20 +02:00
TORRENT_ASSERT(!m_recv_buffer.packet_finished());
2007-06-06 02:41:20 +02:00
return;
}
// found complete sync
else
{
std::size_t bytes_processed = syncoffset + 20;
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("*** sync point (hash) found at offset %d"
, m_sync_bytes_read + bytes_processed - 20);
#endif
2007-06-06 02:41:20 +02:00
m_state = read_pe_skey_vc;
// skey,vc - 28 bytes
m_sync_hash.reset();
int transferred_used = bytes_processed - recv_buffer.left() + bytes_transferred;
TORRENT_ASSERT(transferred_used <= int(bytes_transferred));
2014-07-06 21:18:00 +02:00
received_bytes(0, transferred_used);
bytes_transferred -= transferred_used;
m_recv_buffer.cut(bytes_processed, 28);
2007-06-06 02:41:20 +02:00
}
}
if (m_state == read_pe_skey_vc)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
bytes_transferred = 0;
TORRENT_ASSERT(!m_encrypted);
TORRENT_ASSERT(!m_rc4_encrypted);
TORRENT_ASSERT(!is_outgoing());
TORRENT_ASSERT(m_recv_buffer.packet_size() == 28);
2007-06-06 02:41:20 +02:00
if (!m_recv_buffer.packet_finished()) return;
2014-07-06 21:18:00 +02:00
if (is_disconnecting()) return;
TORRENT_ASSERT(!is_disconnecting());
2007-06-06 02:41:20 +02:00
recv_buffer = m_recv_buffer.get();
2007-06-06 02:41:20 +02:00
2014-07-06 21:18:00 +02:00
TORRENT_ASSERT(!is_disconnecting());
2007-06-06 02:41:20 +02:00
2014-07-06 21:18:00 +02:00
sha1_hash ih(recv_buffer.begin);
torrent const* ti = m_ses.find_encrypted_torrent(ih, m_dh_key_exchange->get_hash_xor_mask());
2007-06-06 02:41:20 +02:00
2014-07-06 21:18:00 +02:00
if (ti)
{
if (!t)
2007-06-06 02:41:20 +02:00
{
2014-07-06 21:18:00 +02:00
attach_to_torrent(ti->info_hash(), false);
if (is_disconnecting()) return;
TORRENT_ASSERT(!is_disconnecting());
2007-06-06 02:41:20 +02:00
2014-07-06 21:18:00 +02:00
t = associated_torrent().lock();
TORRENT_ASSERT(t);
}
init_pe_rc4_handler(m_dh_key_exchange->get_secret(), ti->info_hash());
#ifdef TORRENT_LOGGING
2014-07-06 21:18:00 +02:00
peer_log("*** stream key found, torrent located");
2007-06-06 02:41:20 +02:00
#endif
}
if (!m_rc4.get())
{
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_info_hash, op_bittorrent, 1);
return;
}
2007-06-06 02:41:20 +02:00
// verify constant
buffer::interval wr_recv_buf = m_recv_buffer.mutable_buffer();
rc4_decrypt(wr_recv_buf.begin + 20, 8);
2007-06-06 02:41:20 +02:00
wr_recv_buf.begin += 28;
const char sh_vc[] = {0,0,0,0, 0,0,0,0};
if (!std::equal(sh_vc, sh_vc+8, recv_buffer.begin + 20))
{
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_encryption_constant, op_encryption, 2);
return;
}
2007-06-06 02:41:20 +02:00
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("*** verification constant found");
2007-06-06 02:41:20 +02:00
#endif
m_state = read_pe_cryptofield;
m_recv_buffer.reset(4 + 2);
}
2007-06-06 02:41:20 +02:00
// cannot fall through into
if (m_state == read_pe_syncvc)
{
TORRENT_ASSERT(is_outgoing());
TORRENT_ASSERT(!m_encrypted);
TORRENT_ASSERT(!m_rc4_encrypted);
TORRENT_ASSERT(recv_buffer == m_recv_buffer.get());
2007-06-06 02:41:20 +02:00
if (recv_buffer.left() < 8)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
if (m_recv_buffer.packet_finished())
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_encryption_constant, op_encryption, 2);
2007-06-06 02:41:20 +02:00
return;
}
// generate the verification constant
if (!m_sync_vc.get())
{
TORRENT_ASSERT(m_sync_bytes_read == 0);
2007-06-06 02:41:20 +02:00
m_sync_vc.reset(new (std::nothrow) char[8]);
if (!m_sync_vc)
{
2014-07-06 21:18:00 +02:00
disconnect(errors::no_memory, op_encryption);
return;
}
2007-06-06 02:41:20 +02:00
std::fill(m_sync_vc.get(), m_sync_vc.get() + 8, 0);
rc4_decrypt(m_sync_vc.get(), 8);
2007-06-06 02:41:20 +02:00
}
TORRENT_ASSERT(m_sync_vc.get());
2007-06-06 02:41:20 +02:00
int syncoffset = get_syncoffset(m_sync_vc.get(), 8
, recv_buffer.begin, recv_buffer.left());
// No sync
if (syncoffset == -1)
{
std::size_t bytes_processed = recv_buffer.left() - 8;
m_sync_bytes_read += bytes_processed;
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
2007-06-06 02:41:20 +02:00
if (m_sync_bytes_read >= 512)
{
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_encryption_constant, op_encryption, 2);
return;
}
2007-06-06 02:41:20 +02:00
m_recv_buffer.cut(bytes_processed, (std::min)(m_recv_buffer.packet_size()
, (512+8) - m_sync_bytes_read));
2007-06-06 02:41:20 +02:00
TORRENT_ASSERT(!m_recv_buffer.packet_finished());
2007-06-06 02:41:20 +02:00
}
// found complete sync
else
{
std::size_t bytes_processed = syncoffset + 8;
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("*** sync point (verification constant) found at offset %d"
, m_sync_bytes_read + bytes_processed - 8);
2007-06-06 02:41:20 +02:00
#endif
int transferred_used = bytes_processed - recv_buffer.left() + bytes_transferred;
TORRENT_ASSERT(transferred_used <= int(bytes_transferred));
2014-07-06 21:18:00 +02:00
received_bytes(0, transferred_used);
bytes_transferred -= transferred_used;
m_recv_buffer.cut(bytes_processed, 4 + 2);
2007-06-06 02:41:20 +02:00
// delete verification constant
m_sync_vc.reset();
m_state = read_pe_cryptofield;
// fall through
}
}
if (m_state == read_pe_cryptofield) // local/remote
{
TORRENT_ASSERT(!m_encrypted);
TORRENT_ASSERT(!m_rc4_encrypted);
TORRENT_ASSERT(m_recv_buffer.packet_size() == 4+2);
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
bytes_transferred = 0;
2007-06-06 02:41:20 +02:00
if (!m_recv_buffer.packet_finished()) return;
2007-06-06 02:41:20 +02:00
buffer::interval wr_buf = m_recv_buffer.mutable_buffer();
rc4_decrypt(wr_buf.begin, m_recv_buffer.packet_size());
2007-06-06 02:41:20 +02:00
recv_buffer = m_recv_buffer.get();
2007-06-06 02:41:20 +02:00
2014-12-01 11:43:34 +01:00
boost::uint32_t crypto_field = detail::read_uint32(recv_buffer.begin);
2007-06-06 02:41:20 +02:00
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("*** crypto %s : [%s%s ]"
, is_outgoing() ? "select" : "provide"
2010-12-01 05:22:03 +01:00
, (crypto_field & 1) ? " plaintext" : ""
, (crypto_field & 2) ? " rc4" : "");
2007-06-06 02:41:20 +02:00
#endif
if (!is_outgoing())
2007-06-06 02:41:20 +02:00
{
// select a crypto method
int allowed_encryption = m_settings.get_int(settings_pack::allowed_enc_level);
2014-12-01 11:43:34 +01:00
boost::uint32_t crypto_select = crypto_field & allowed_encryption;
2011-08-29 04:00:17 +02:00
// when prefer_rc4 is set, keep the most significant bit
// otherwise keep the least significant one
if (m_settings.get_bool(settings_pack::prefer_rc4))
2007-06-06 02:41:20 +02:00
{
2014-12-01 11:43:34 +01:00
boost::uint32_t mask = (std::numeric_limits<boost::uint32_t>::max)();
2011-08-29 04:00:17 +02:00
while (crypto_select & (mask << 1))
2007-06-06 02:41:20 +02:00
{
2011-08-29 04:00:17 +02:00
mask <<= 1;
crypto_select = crypto_select & mask;
2007-06-06 02:41:20 +02:00
}
2011-08-29 04:00:17 +02:00
}
else
{
2014-12-01 11:43:34 +01:00
boost::uint32_t mask = (std::numeric_limits<boost::uint32_t>::max)();
2011-08-29 04:00:17 +02:00
while (crypto_select & (mask >> 1))
2007-06-06 02:41:20 +02:00
{
2011-08-29 04:00:17 +02:00
mask >>= 1;
crypto_select = crypto_select & mask;
2007-06-06 02:41:20 +02:00
}
2011-08-29 04:00:17 +02:00
}
if (crypto_select == 0)
{
2014-07-06 21:18:00 +02:00
disconnect(errors::unsupported_encryption_mode, op_encryption, 1);
return;
2011-08-29 04:00:17 +02:00
}
2007-06-06 02:41:20 +02:00
// write the pe4 step
write_pe4_sync(crypto_select);
}
else // is_outgoing()
2007-06-06 02:41:20 +02:00
{
// check if crypto select is valid
int allowed_encryption = m_settings.get_int(settings_pack::allowed_enc_level);
2007-06-06 02:41:20 +02:00
2011-08-29 04:00:17 +02:00
crypto_field &= allowed_encryption;
if (crypto_field == 0)
{
2011-08-29 04:00:17 +02:00
// we don't allow any of the offered encryption levels
2014-07-06 21:18:00 +02:00
disconnect(errors::unsupported_encryption_mode_selected, op_encryption, 2);
return;
}
2011-08-29 04:00:17 +02:00
2014-07-06 21:18:00 +02:00
if (crypto_field == settings_pack::pe_plaintext)
2011-08-29 04:00:17 +02:00
m_rc4_encrypted = false;
2014-07-06 21:18:00 +02:00
else if (crypto_field == settings_pack::pe_rc4)
2011-08-29 04:00:17 +02:00
m_rc4_encrypted = true;
2007-06-06 02:41:20 +02:00
}
int len_pad = detail::read_int16(recv_buffer.begin);
if (len_pad < 0 || len_pad > 512)
{
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_pad_size, op_encryption, 2);
return;
}
2007-06-06 02:41:20 +02:00
m_state = read_pe_pad;
if (!is_outgoing())
m_recv_buffer.reset(len_pad + 2); // len(IA) at the end of pad
2007-06-06 02:41:20 +02:00
else
{
if (len_pad == 0)
{
m_encrypted = true;
if (m_rc4_encrypted)
{
switch_send_crypto(m_rc4);
switch_recv_crypto(m_rc4);
}
2007-06-06 02:41:20 +02:00
m_state = init_bt_handshake;
}
else
m_recv_buffer.reset(len_pad);
2007-06-06 02:41:20 +02:00
}
}
if (m_state == read_pe_pad)
{
TORRENT_ASSERT(!m_encrypted);
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
bytes_transferred = 0;
if (!m_recv_buffer.packet_finished()) return;
2007-06-06 02:41:20 +02:00
int pad_size = is_outgoing() ? m_recv_buffer.packet_size() : m_recv_buffer.packet_size() - 2;
2007-06-06 02:41:20 +02:00
buffer::interval wr_buf = m_recv_buffer.mutable_buffer();
rc4_decrypt(wr_buf.begin, m_recv_buffer.packet_size());
recv_buffer = m_recv_buffer.get();
2007-06-06 02:41:20 +02:00
if (!is_outgoing())
2007-06-06 02:41:20 +02:00
{
recv_buffer.begin += pad_size;
int len_ia = detail::read_int16(recv_buffer.begin);
2007-06-07 13:04:00 +02:00
if (len_ia < 0)
{
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_encrypt_handshake, op_encryption, 2);
return;
}
2007-06-07 13:04:00 +02:00
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("*** len(IA) : %d", len_ia);
2007-06-06 02:41:20 +02:00
#endif
if (len_ia == 0)
{
// everything after this is Encrypt2
m_encrypted = true;
if (m_rc4_encrypted)
{
switch_send_crypto(m_rc4);
switch_recv_crypto(m_rc4);
}
2007-06-06 02:41:20 +02:00
m_state = init_bt_handshake;
}
else
{
m_state = read_pe_ia;
m_recv_buffer.reset(len_ia);
2007-06-06 02:41:20 +02:00
}
}
else // is_outgoing()
2007-06-06 02:41:20 +02:00
{
// everything that arrives after this is Encrypt2
m_encrypted = true;
if (m_rc4_encrypted)
{
switch_send_crypto(m_rc4);
switch_recv_crypto(m_rc4);
}
2007-06-06 02:41:20 +02:00
m_state = init_bt_handshake;
}
}
if (m_state == read_pe_ia)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
bytes_transferred = 0;
TORRENT_ASSERT(!is_outgoing());
TORRENT_ASSERT(!m_encrypted);
if (!m_recv_buffer.packet_finished()) return;
2007-06-06 02:41:20 +02:00
// ia is always rc4, so decrypt it
buffer::interval wr_buf = m_recv_buffer.mutable_buffer();
rc4_decrypt(wr_buf.begin, m_recv_buffer.packet_size());
2007-06-06 02:41:20 +02:00
#ifdef TORRENT_LOGGING
peer_log("*** decrypted ia : %d bytes", m_recv_buffer.packet_size());
#endif
2007-06-06 02:41:20 +02:00
2011-08-29 04:00:17 +02:00
// everything that arrives after this is encrypted
2007-06-06 02:41:20 +02:00
m_encrypted = true;
if (m_rc4_encrypted)
{
switch_send_crypto(m_rc4);
switch_recv_crypto(m_rc4);
}
m_rc4.reset();
2007-06-06 02:41:20 +02:00
m_state = read_protocol_identifier;
m_recv_buffer.cut(0, 20);
2007-06-06 02:41:20 +02:00
}
if (m_state == init_bt_handshake)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
bytes_transferred = 0;
TORRENT_ASSERT(m_encrypted);
2007-06-06 02:41:20 +02:00
2014-07-06 21:18:00 +02:00
if (is_outgoing() && t->ready_for_connections())
{
write_bitfield();
#ifndef TORRENT_DISABLE_DHT
if (m_supports_dht_port && m_ses.has_dht())
write_dht_port(m_ses.external_udp_port());
#endif
// if we don't have any pieces, don't do any preemptive
// unchoking at all.
if (t->num_have() > 0)
{
// if the peer is ignoring unchoke slots, or if we have enough
// unused slots, unchoke this peer right away, to save a round-trip
// in case it's interested.
maybe_unchoke_this_peer();
2014-07-06 21:18:00 +02:00
}
}
2007-06-06 02:41:20 +02:00
// decrypt remaining received bytes
if (m_rc4_encrypted)
{
buffer::interval wr_buf = m_recv_buffer.mutable_buffer();
wr_buf.begin += m_recv_buffer.packet_size();
rc4_decrypt(wr_buf.begin, wr_buf.left());
#ifdef TORRENT_LOGGING
2010-12-01 05:22:03 +01:00
peer_log("*** decrypted remaining %d bytes", wr_buf.left());
2007-06-06 02:41:20 +02:00
#endif
}
m_rc4.reset();
2007-06-06 02:41:20 +02:00
// payload stream, start with 20 handshake bytes
m_state = read_protocol_identifier;
m_recv_buffer.reset(20);
2007-06-06 02:41:20 +02:00
// encrypted portion of handshake completed, toggle
// peer_info pe_support flag back to true
if (is_outgoing() &&
m_settings.get_int(settings_pack::out_enc_policy)
2014-07-06 21:18:00 +02:00
== settings_pack::pe_enabled)
2007-06-06 02:41:20 +02:00
{
2014-07-06 21:18:00 +02:00
torrent_peer* pi = peer_info_struct();
TORRENT_ASSERT(pi);
2007-06-06 02:41:20 +02:00
2007-06-30 09:28:44 +02:00
pi->pe_support = true;
2007-06-06 02:41:20 +02:00
}
}
#endif // #if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
2007-06-06 02:41:20 +02:00
if (m_state == read_protocol_identifier)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
bytes_transferred = 0;
TORRENT_ASSERT(m_recv_buffer.packet_size() == 20);
2007-06-06 02:41:20 +02:00
if (!m_recv_buffer.packet_finished()) return;
recv_buffer = m_recv_buffer.get();
2007-06-06 02:41:20 +02:00
int packet_size = recv_buffer[0];
const char protocol_string[] = "\x13" "BitTorrent protocol";
2007-06-06 02:41:20 +02:00
if (packet_size != 19 ||
memcmp(recv_buffer.begin, protocol_string, 20) != 0)
{
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
#ifdef TORRENT_LOGGING
peer_log("*** unrecognized protocol header");
#endif
2011-09-12 05:51:49 +02:00
#ifdef TORRENT_USE_OPENSSL
if (is_ssl(*get_socket()))
2011-09-12 05:51:49 +02:00
{
#ifdef TORRENT_LOGGING
2011-09-12 05:51:49 +02:00
peer_log("*** SSL peers are not allowed to use any other encryption");
#endif
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_info_hash, op_bittorrent, 1);
2011-09-12 05:51:49 +02:00
return;
}
#endif // TORRENT_USE_OPENSSL
if (!is_outgoing()
&& m_settings.get_int(settings_pack::in_enc_policy)
2014-07-06 21:18:00 +02:00
== settings_pack::pe_disabled)
{
2014-07-06 21:18:00 +02:00
disconnect(errors::no_incoming_encrypted, op_bittorrent);
return;
}
2007-06-06 02:41:20 +02:00
// Don't attempt to perform an encrypted handshake
// within an encrypted connection. For local connections,
// we're expected to already have passed the encrypted
// handshake by this point
if (m_encrypted || is_outgoing())
2007-06-06 02:41:20 +02:00
{
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_info_hash, op_bittorrent, 1);
return;
}
#ifdef TORRENT_LOGGING
peer_log("*** attempting encrypted connection");
#endif
m_state = read_pe_dhkey;
m_recv_buffer.cut(0, dh_key_len);
TORRENT_ASSERT(!m_recv_buffer.packet_finished());
return;
#else
2014-07-06 21:18:00 +02:00
disconnect(errors::invalid_info_hash, op_bittorrent, 1);
return;
#endif // TORRENT_DISABLE_ENCRYPTION
}
else
{
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
TORRENT_ASSERT(m_state != read_pe_dhkey);
2007-06-06 02:41:20 +02:00
if (!is_outgoing()
&& m_settings.get_int(settings_pack::in_enc_policy)
2014-07-06 21:18:00 +02:00
== settings_pack::pe_forced
&& !m_encrypted
&& !is_ssl(*get_socket()))
{
2014-07-06 21:18:00 +02:00
disconnect(errors::no_incoming_regular, op_bittorrent);
return;
}
2007-06-06 02:41:20 +02:00
#endif
#ifdef TORRENT_LOGGING
peer_log("<== BitTorrent protocol");
2007-06-06 02:41:20 +02:00
#endif
}
2007-06-06 02:41:20 +02:00
m_state = read_info_hash;
m_recv_buffer.reset(28);
}
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// fall through
if (m_state == read_info_hash)
{
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received_bytes(0, bytes_transferred);
bytes_transferred = 0;
TORRENT_ASSERT(m_recv_buffer.packet_size() == 28);
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if (!m_recv_buffer.packet_finished()) return;
recv_buffer = m_recv_buffer.get();
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#ifdef TORRENT_LOGGING
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std::string extensions;
extensions.resize(8 * 8);
for (int i=0; i < 8; ++i)
{
for (int j=0; j < 8; ++j)
{
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if (recv_buffer[i] & (0x80 >> j)) extensions[i*8+j] = '1';
else extensions[i*8+j] = '0';
}
}
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peer_log("<== EXTENSIONS [ %s ext: %s%s%s]"
, extensions.c_str()
, (recv_buffer[7] & 0x01) ? "DHT " : ""
, (recv_buffer[7] & 0x04) ? "FAST " : ""
, (recv_buffer[5] & 0x10) ? "extension " : "");
#endif
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#ifndef TORRENT_DISABLE_EXTENSIONS
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std::memcpy(m_reserved_bits, recv_buffer.begin, 8);
if ((recv_buffer[5] & 0x10))
m_supports_extensions = true;
#endif
if (recv_buffer[7] & 0x01)
m_supports_dht_port = true;
if (recv_buffer[7] & 0x04)
m_supports_fast = true;
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t = associated_torrent().lock();
// 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());
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
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bool allow_encrypted = m_encrypted && m_rc4_encrypted;
#else
bool allow_encrypted = true;
#endif
attach_to_torrent(info_hash, allow_encrypted);
if (is_disconnecting()) return;
}
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_LOGGING
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peer_log("*** received invalid info_hash");
#endif
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disconnect(errors::invalid_info_hash, op_bittorrent, 1);
return;
}
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#ifdef TORRENT_LOGGING
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peer_log("<<< info_hash received");
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#endif
}
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t = associated_torrent().lock();
TORRENT_ASSERT(t);
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// if this is a local connection, we have already
// sent the handshake
if (!is_outgoing()) write_handshake();
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TORRENT_ASSERT(m_sent_handshake);
if (is_disconnecting()) return;
m_state = read_peer_id;
m_recv_buffer.reset(20);
}
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// fall through
if (m_state == read_peer_id)
{
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TORRENT_ASSERT(m_sent_handshake);
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received_bytes(0, bytes_transferred);
// bytes_transferred = 0;
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t = associated_torrent().lock();
if (!t)
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{
TORRENT_ASSERT(!m_recv_buffer.packet_finished()); // TODO
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return;
}
TORRENT_ASSERT(m_recv_buffer.packet_size() == 20);
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if (!m_recv_buffer.packet_finished()) return;
recv_buffer = m_recv_buffer.get();
#ifdef TORRENT_LOGGING
{
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char hex_pid[41];
to_hex(recv_buffer.begin, 20, hex_pid);
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hex_pid[40] = 0;
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char ascii_pid[21];
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ascii_pid[20] = 0;
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for (int i = 0; i != 20; ++i)
{
if (is_print(recv_buffer.begin[i])) ascii_pid[i] = recv_buffer.begin[i];
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else ascii_pid[i] = '.';
}
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peer_log("<<< received peer_id: %s client: %s ascii: \"%s\""
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, hex_pid, identify_client(peer_id(recv_buffer.begin)).c_str(), ascii_pid);
}
#endif
peer_id pid;
std::copy(recv_buffer.begin, recv_buffer.begin + 20, (char*)pid.begin());
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if (t->settings().get_bool(settings_pack::allow_multiple_connections_per_ip))
{
// now, let's see if this connection should be closed
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peer_connection* p = t->find_peer(pid);
if (p)
{
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TORRENT_ASSERT(p->pid() == pid);
// we found another connection with the same peer-id
// which connection should be closed in order to be
// sure that the other end closes the same connection?
// the peer with greatest peer-id is the one allowed to
// initiate connections. So, if our peer-id is greater than
// the others, we should close the incoming connection,
// if not, we should close the outgoing one.
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if (pid < m_our_peer_id && is_outgoing())
{
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p->disconnect(errors::duplicate_peer_id, op_bittorrent);
}
else
{
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disconnect(errors::duplicate_peer_id, op_bittorrent);
return;
}
}
}
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set_pid(pid);
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// disconnect if the peer has the same peer-id as ourself
// since it most likely is ourself then
if (pid == m_our_peer_id)
{
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if (peer_info_struct()) t->ban_peer(peer_info_struct());
disconnect(errors::self_connection, op_bittorrent, 1);
return;
}
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 (max_out_request_queue() > 50) max_out_request_queue(50);
}
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end;)
{
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if (!(*i)->on_handshake(m_reserved_bits))
{
i = m_extensions.erase(i);
}
else
{
++i;
}
}
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if (is_disconnecting()) return;
if (m_supports_extensions) write_extensions();
#endif
#ifdef TORRENT_LOGGING
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peer_log("<== HANDSHAKE");
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#endif
// consider this a successful connection, reset the failcount
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if (peer_info_struct())
t->clear_failcount(peer_info_struct());
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#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
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// Toggle pe_support back to false if this is a
// standard successful connection
if (is_outgoing() && !m_encrypted &&
m_settings.get_int(settings_pack::out_enc_policy)
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== settings_pack::pe_enabled)
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{
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torrent_peer* pi = peer_info_struct();
TORRENT_ASSERT(pi);
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pi->pe_support = false;
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}
#endif
m_state = read_packet_size;
m_recv_buffer.reset(5);
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TORRENT_ASSERT(!m_recv_buffer.packet_finished());
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return;
}
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// cannot fall through into
if (m_state == read_packet_size)
{
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// Make sure this is not fallen though into
TORRENT_ASSERT(recv_buffer == m_recv_buffer.get());
TORRENT_ASSERT(m_recv_buffer.packet_size() == 5);
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if (!t) return;
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// the 5th byte (if one) should not count as protocol
// byte here, instead it's counted in the message
// handler itself, for the specific message
TORRENT_ASSERT(bytes_transferred <= 5);
int used_bytes = recv_buffer.left() > 4 ? bytes_transferred - 1: bytes_transferred;
received_bytes(0, used_bytes);
bytes_transferred -= used_bytes;
if (recv_buffer.left() < 4) return;
TORRENT_ASSERT(bytes_transferred <= 1);
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
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received_bytes(0, bytes_transferred);
disconnect(errors::packet_too_large, op_bittorrent, 2);
return;
}
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if (packet_size == 0)
{
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TORRENT_ASSERT(bytes_transferred <= 1);
received_bytes(0, bytes_transferred);
incoming_keepalive();
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if (is_disconnecting()) return;
// keepalive message
m_state = read_packet_size;
m_recv_buffer.cut(4, 5);
return;
}
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if (recv_buffer.left() < 5) return;
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m_state = read_packet;
m_recv_buffer.cut(4, packet_size);
recv_buffer = m_recv_buffer.get();
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TORRENT_ASSERT(recv_buffer.left() == 1);
TORRENT_ASSERT(bytes_transferred == 1);
}
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if (m_state == read_packet)
{
TORRENT_ASSERT(recv_buffer == m_recv_buffer.get());
2008-10-09 05:33:53 +02:00
if (!t)
{
2014-07-06 21:18:00 +02:00
received_bytes(0, bytes_transferred);
disconnect(errors::torrent_removed, op_bittorrent, 1);
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return;
}
#ifdef TORRENT_DEBUG
boost::int64_t cur_payload_dl = statistics().last_payload_downloaded();
boost::int64_t cur_protocol_dl = statistics().last_protocol_downloaded();
2008-10-09 05:33:53 +02:00
#endif
if (dispatch_message(bytes_transferred))
{
m_state = read_packet_size;
m_recv_buffer.reset(5);
}
#ifdef TORRENT_DEBUG
2014-07-06 21:18:00 +02:00
TORRENT_ASSERT(statistics().last_payload_downloaded() - cur_payload_dl >= 0);
TORRENT_ASSERT(statistics().last_protocol_downloaded() - cur_protocol_dl >= 0);
boost::int64_t stats_diff = statistics().last_payload_downloaded() - cur_payload_dl +
2014-07-06 21:18:00 +02:00
statistics().last_protocol_downloaded() - cur_protocol_dl;
TORRENT_ASSERT(stats_diff == boost::int64_t(bytes_transferred));
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#endif
TORRENT_ASSERT(!m_recv_buffer.packet_finished());
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return;
}
TORRENT_ASSERT(!m_recv_buffer.packet_finished());
}
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
int bt_peer_connection::hit_send_barrier(std::vector<asio::mutable_buffer>& iovec)
{
int next_barrier = m_enc_handler.encrypt(iovec);
#ifdef TORRENT_LOGGING
if (next_barrier != 0)
peer_log("==> encrypted block [ s = %d ]", next_barrier);
#endif
return next_barrier;
}
#endif
// --------------------------
// SEND DATA
// --------------------------
2008-05-03 18:05:42 +02:00
void bt_peer_connection::on_sent(error_code const& error
, std::size_t bytes_transferred)
{
INVARIANT_CHECK;
if (error)
{
2014-07-06 21:18:00 +02:00
sent_bytes(0, bytes_transferred);
return;
}
// manage the payload markers
int amount_payload = 0;
if (!m_payloads.empty())
{
2014-07-06 21:18:00 +02:00
// this points to the first entry to not erase. i.e.
// [begin, first_to_keep) will be erased because
// the payload ranges they represent have been sent
std::vector<range>::iterator first_to_keep = m_payloads.begin();
for (std::vector<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;
2014-07-06 21:18:00 +02:00
TORRENT_ASSERT(first_to_keep == i);
++first_to_keep;
}
else
{
amount_payload += -i->start;
i->length -= -i->start;
i->start = 0;
}
}
}
2014-07-06 21:18:00 +02:00
// remove all payload ranges that have been sent
m_payloads.erase(m_payloads.begin(), first_to_keep);
}
TORRENT_ASSERT(amount_payload <= (int)bytes_transferred);
2014-07-06 21:18:00 +02:00
sent_bytes(amount_payload, bytes_transferred - amount_payload);
if (amount_payload > 0)
{
boost::shared_ptr<torrent> t = associated_torrent().lock();
TORRENT_ASSERT(t);
if (t) t->update_last_upload();
}
}
2014-01-21 20:26:09 +01:00
#if TORRENT_USE_INVARIANT_CHECKS
void bt_peer_connection::check_invariant() const
{
boost::shared_ptr<torrent> t = associated_torrent().lock();
#if !defined(TORRENT_DISABLE_ENCRYPTION) && !defined(TORRENT_DISABLE_EXTENSIONS)
TORRENT_ASSERT( (bool(m_state != read_pe_dhkey) || m_dh_key_exchange.get())
|| !is_outgoing());
2007-06-07 12:18:13 +02:00
TORRENT_ASSERT(!m_rc4_encrypted || (!m_encrypted && m_rc4) || (m_encrypted && !m_enc_handler.is_send_plaintext()));
2007-06-06 02:41:20 +02:00
#endif
2007-11-19 08:07:57 +01:00
if (!in_handshake())
{
TORRENT_ASSERT(m_sent_handshake);
}
if (!m_payloads.empty())
{
for (std::vector<range>::const_iterator i = m_payloads.begin();
i != m_payloads.end() - 1; ++i)
{
TORRENT_ASSERT(i->start + i->length <= (i+1)->start);
}
}
}
#endif
}