void do_handshake(tcp::socket& s, sha1_hash const& ih, char* buffer)
{
char handshake[] = "\x13" "BitTorrent protocol\0\0\0\0\0\x10\0\x04"
" " // space for info-hash
"aaaaaaaaaaaaaaaaaaaa"; // peer-id
log("==> handshake");
error_code ec;
std::memcpy(handshake + 28, ih.begin(), 20);
boost::asio::write(s, boost::asio::buffer(handshake, sizeof(handshake) - 1)
, boost::asio::transfer_all(), ec);
if (ec)
{
TEST_ERROR(ec.message());
return;
}
// read handshake
boost::asio::read(s, boost::asio::buffer(buffer, 68)
, boost::asio::transfer_all(), ec);
if (ec)
{
TEST_ERROR(ec.message());
return;
}
log("<== handshake");
TEST_CHECK(buffer[0] == 19);
TEST_CHECK(std::memcmp(buffer + 1, "BitTorrent protocol", 19) == 0);
char* extensions = buffer + 20;
// check for fast extension support
TEST_CHECK(extensions[7] & 0x4);
// check for extension protocol support
bool const lt_extension_protocol = (extensions[5] & 0x10) != 0;
#ifndef TORRENT_DISABLE_EXTENSIONS
TEST_CHECK(lt_extension_protocol == true);
#else
TEST_CHECK(lt_extension_protocol == false);
#endif
// check for DHT support
bool const dht_support = (extensions[7] & 0x1) != 0;
#ifndef TORRENT_DISABLE_DHT
TEST_CHECK(dht_support == true);
#else
TEST_CHECK(dht_support == false);
#endif
TEST_CHECK(std::memcmp(buffer + 28, ih.begin(), 20) == 0);
}
void do_handshake(stream_socket& s, sha1_hash const& ih, char* buffer)
{
char handshake[] = "\x13" "BitTorrent protocol\0\0\0\0\0\0\0\x04"
" " // space for info-hash
"aaaaaaaaaaaaaaaaaaaa" // peer-id
"\0\0\0\x01\x0e"; // have_all
std::cout << "send handshake" << std::endl;
error_code ec;
std::memcpy(handshake + 28, ih.begin(), 20);
libtorrent::asio::write(s, libtorrent::asio::buffer(handshake, sizeof(handshake) - 1), libtorrent::asio::transfer_all(), ec);
if (ec)
{
std::cout << ec.message() << std::endl;
exit(1);
}
// read handshake
libtorrent::asio::read(s, libtorrent::asio::buffer(buffer, 68), libtorrent::asio::transfer_all(), ec);
if (ec)
{
std::cout << ec.message() << std::endl;
exit(1);
}
std::cout << "received handshake" << std::endl;
TEST_CHECK(buffer[0] == 19);
TEST_CHECK(std::memcmp(buffer + 1, "BitTorrent protocol", 19) == 0);
char* extensions = buffer + 20;
// check for fast extension support
TEST_CHECK(extensions[7] & 0x4);
#ifndef TORRENT_DISABLE_EXTENSIONS
// check for extension protocol support
TEST_CHECK(extensions[5] & 0x10);
#endif
#ifndef TORRENT_DISABLE_DHT
// check for DHT support
TEST_CHECK(extensions[7] & 0x1);
#endif
TEST_CHECK(std::memcmp(buffer + 28, ih.begin(), 20) == 0);
}
hasher& update(std::string const& data) { update(data.c_str(), data.size()); return *this; }
hasher& update(const char* data, int len)
{
TORRENT_ASSERT(data != 0);
TORRENT_ASSERT(len > 0);
#ifdef TORRENT_USE_GCRYPT
gcry_md_write(m_context, data, len);
#else
SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data), len);
#endif
return *this;
}
sha1_hash final()
{
sha1_hash digest;
#ifdef TORRENT_USE_GCRYPT
gcry_md_final(m_context);
digest.assign((const char*)gcry_md_read(m_context, 0));
#else
SHA1_Final(digest.begin(), &m_context);
#endif
return digest;
}
void reset()
{
#ifdef TORRENT_USE_GCRYPT
gcry_md_reset(m_context);
#else
SHA1_Init(&m_context);
bytes sha1_hash_bytes(const sha1_hash& bn) {
return bytes(bn.to_string());
}
gcry_md_write(m_context, data.data(), data.size());
#elif TORRENT_USE_COMMONCRYPTO
CC_SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data.data()), CC_LONG(data.size()));
#elif TORRENT_USE_CRYPTOAPI
m_context.update(data);
#elif defined TORRENT_USE_LIBCRYPTO
SHA1_Update(&m_context, reinterpret_cast<unsigned char const*>(data.data()), data.size());
#else
SHA1_update(&m_context, reinterpret_cast<unsigned char const*>(data.data()), data.size());
#endif
return *this;
}
sha1_hash hasher::final()
{
sha1_hash digest;
#ifdef TORRENT_USE_LIBGCRYPT
gcry_md_final(m_context);
digest.assign((char const*)gcry_md_read(m_context, 0));
#elif TORRENT_USE_COMMONCRYPTO
CC_SHA1_Final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);
#elif TORRENT_USE_CRYPTOAPI
m_context.get_hash(digest.data(), digest.size());
#elif defined TORRENT_USE_LIBCRYPTO
SHA1_Final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);
#else
SHA1_final(reinterpret_cast<unsigned char*>(digest.data()), &m_context);
#endif
return digest;
}
tracker_response parse_tracker_response(char const* data, int size, error_code& ec
, int flags, sha1_hash scrape_ih)
{
tracker_response resp;
bdecode_node e;
int res = bdecode(data, data + size, e, ec);
if (ec) return resp;
if (res != 0 || e.type() != bdecode_node::dict_t)
{
ec.assign(errors::invalid_tracker_response, get_libtorrent_category());
return resp;
}
int interval = int(e.dict_find_int_value("interval", 0));
// if no interval is specified, default to 30 minutes
if (interval == 0) interval = 1800;
int min_interval = int(e.dict_find_int_value("min interval", 30));
resp.interval = interval;
resp.min_interval = min_interval;
bdecode_node tracker_id = e.dict_find_string("tracker id");
if (tracker_id)
resp.trackerid = tracker_id.string_value();
// parse the response
bdecode_node failure = e.dict_find_string("failure reason");
if (failure)
{
resp.failure_reason = failure.string_value();
ec.assign(errors::tracker_failure, get_libtorrent_category());
return resp;
}
bdecode_node warning = e.dict_find_string("warning message");
if (warning)
resp.warning_message = warning.string_value();
if (0 != (flags & tracker_request::scrape_request))
{
bdecode_node files = e.dict_find_dict("files");
if (!files)
{
ec.assign(errors::invalid_files_entry, get_libtorrent_category());
return resp;
}
bdecode_node scrape_data = files.dict_find_dict(
scrape_ih.to_string());
if (!scrape_data)
{
ec.assign(errors::invalid_hash_entry, get_libtorrent_category());
return resp;
}
resp.complete = int(scrape_data.dict_find_int_value("complete", -1));
resp.incomplete = int(scrape_data.dict_find_int_value("incomplete", -1));
resp.downloaded = int(scrape_data.dict_find_int_value("downloaded", -1));
resp.downloaders = int(scrape_data.dict_find_int_value("downloaders", -1));
return resp;
}
// look for optional scrape info
resp.complete = int(e.dict_find_int_value("complete", -1));
resp.incomplete = int(e.dict_find_int_value("incomplete", -1));
resp.downloaded = int(e.dict_find_int_value("downloaded", -1));
bdecode_node peers_ent = e.dict_find("peers");
if (peers_ent && peers_ent.type() == bdecode_node::string_t)
{
char const* peers = peers_ent.string_ptr();
int len = peers_ent.string_length();
#if TORRENT_USE_I2P
if (0 != (flags & tracker_request::i2p))
{
error_code parse_error;
for (int i = 0; i < len; i += 32)
{
if (len - i < 32) break;
peer_entry p;
p.hostname = base32encode(std::string(peers + i, 32), string::i2p);
p.hostname += ".b32.i2p";
p.port = 6881;
resp.peers.push_back(p);
}
}
else
#endif
{
resp.peers4.reserve(len / 6);
for (int i = 0; i < len; i += 6)
{
if (len - i < 6) break;
ipv4_peer_entry p;
p.ip = detail::read_v4_address(peers).to_v4().to_bytes();
p.port = detail::read_uint16(peers);
resp.peers4.push_back(p);
}
}
}
else if (peers_ent && peers_ent.type() == bdecode_node::list_t)
{
int len = peers_ent.list_size();
resp.peers.reserve(len);
error_code parse_error;
for (int i = 0; i < len; ++i)
{
peer_entry p;
if (!extract_peer_info(peers_ent.list_at(i), p, parse_error))
continue;
resp.peers.push_back(p);
}
// only report an error if all peer entries are invalid
if (resp.peers.empty() && parse_error)
{
ec = parse_error;
return resp;
}
}
else
{
peers_ent.clear();
}
#if TORRENT_USE_IPV6
bdecode_node ipv6_peers = e.dict_find_string("peers6");
if (ipv6_peers)
{
char const* peers = ipv6_peers.string_ptr();
int len = ipv6_peers.string_length();
resp.peers6.reserve(len / 18);
for (int i = 0; i < len; i += 18)
{
if (len - i < 18) break;
ipv6_peer_entry p;
p.ip = detail::read_v6_address(peers).to_v6().to_bytes();
p.port = detail::read_uint16(peers);
resp.peers6.push_back(p);
}
}
else
{
ipv6_peers.clear();
}
#else
bdecode_node ipv6_peers;
#endif
/*
// if we didn't receive any peers. We don't care if we're stopping anyway
if (peers_ent == 0 && ipv6_peers == 0
&& tracker_req().event != tracker_request::stopped)
{
ec.assign(errors::invalid_peers_entry, get_libtorrent_category());
return resp;
}
*/
bdecode_node ip_ent = e.dict_find_string("external ip");
if (ip_ent)
{
char const* p = ip_ent.string_ptr();
if (ip_ent.string_length() == int(address_v4::bytes_type().size()))
resp.external_ip = detail::read_v4_address(p);
#if TORRENT_USE_IPV6
else if (ip_ent.string_length() == int(address_v6::bytes_type().size()))
resp.external_ip = detail::read_v6_address(p);
#endif
}
return resp;
}
tracker_response parse_tracker_response(char const* data, int size, error_code& ec
, bool scrape_request, sha1_hash scrape_ih)
{
tracker_response resp;
lazy_entry e;
int res = lazy_bdecode(data, data + size, e, ec);
if (ec) return resp;
if (res != 0 || e.type() != lazy_entry::dict_t)
{
ec.assign(errors::invalid_tracker_response, get_libtorrent_category());
return resp;
}
int interval = int(e.dict_find_int_value("interval", 0));
// if no interval is specified, default to 30 minutes
if (interval == 0) interval = 1800;
int min_interval = int(e.dict_find_int_value("min interval", 30));
resp.interval = interval;
resp.min_interval = min_interval;
lazy_entry const* tracker_id = e.dict_find_string("tracker id");
if (tracker_id)
resp.trackerid = tracker_id->string_value();
// parse the response
lazy_entry const* failure = e.dict_find_string("failure reason");
if (failure)
{
resp.failure_reason = failure->string_value();
ec.assign(errors::tracker_failure, get_libtorrent_category());
return resp;
}
lazy_entry const* warning = e.dict_find_string("warning message");
if (warning)
resp.warning_message = warning->string_value();
if (scrape_request)
{
lazy_entry const* files = e.dict_find_dict("files");
if (files == 0)
{
ec.assign(errors::invalid_files_entry, get_libtorrent_category());
return resp;
}
lazy_entry const* scrape_data = files->dict_find_dict(
scrape_ih.to_string());
if (scrape_data == 0)
{
ec.assign(errors::invalid_hash_entry, get_libtorrent_category());
return resp;
}
resp.complete = int(scrape_data->dict_find_int_value("complete", -1));
resp.incomplete = int(scrape_data->dict_find_int_value("incomplete", -1));
resp.downloaded = int(scrape_data->dict_find_int_value("downloaded", -1));
resp.downloaders = int(scrape_data->dict_find_int_value("downloaders", -1));
return resp;
}
// look for optional scrape info
resp.complete = int(e.dict_find_int_value("complete", -1));
resp.incomplete = int(e.dict_find_int_value("incomplete", -1));
resp.downloaded = int(e.dict_find_int_value("downloaded", -1));
lazy_entry const* peers_ent = e.dict_find("peers");
if (peers_ent && peers_ent->type() == lazy_entry::string_t)
{
char const* peers = peers_ent->string_ptr();
int len = peers_ent->string_length();
resp.peers4.reserve(len / 6);
for (int i = 0; i < len; i += 6)
{
if (len - i < 6) break;
ipv4_peer_entry p;
error_code ec;
p.ip = detail::read_v4_address(peers).to_v4().to_bytes();
p.port = detail::read_uint16(peers);
resp.peers4.push_back(p);
}
}
else if (peers_ent && peers_ent->type() == lazy_entry::list_t)
{
int len = peers_ent->list_size();
resp.peers.reserve(len);
error_code parse_error;
for (int i = 0; i < len; ++i)
{
peer_entry p;
if (!extract_peer_info(*peers_ent->list_at(i), p, parse_error))
continue;
resp.peers.push_back(p);
}
// only report an error if all peer entries are invalid
if (resp.peers.empty() && parse_error)
{
ec = parse_error;
return resp;
}
}
else
{
peers_ent = 0;
}
#if TORRENT_USE_IPV6
lazy_entry const* ipv6_peers = e.dict_find_string("peers6");
if (ipv6_peers)
{
char const* peers = ipv6_peers->string_ptr();
int len = ipv6_peers->string_length();
resp.peers6.reserve(len / 18);
for (int i = 0; i < len; i += 18)
{
if (len - i < 18) break;
ipv6_peer_entry p;
p.ip = detail::read_v6_address(peers).to_v6().to_bytes();
p.port = detail::read_uint16(peers);
resp.peers6.push_back(p);
}
}
else
{
ipv6_peers = 0;
}
#else
lazy_entry const* ipv6_peers = 0;
#endif
/*
// if we didn't receive any peers. We don't care if we're stopping anyway
if (peers_ent == 0 && ipv6_peers == 0
&& tracker_req().event != tracker_request::stopped)
{
ec.assign(errors::invalid_peers_entry, get_libtorrent_category());
return resp;
}
*/
lazy_entry const* ip_ent = e.dict_find_string("external ip");
if (ip_ent)
{
char const* p = ip_ent->string_ptr();
if (ip_ent->string_length() == int(address_v4::bytes_type().size()))
resp.external_ip = detail::read_v4_address(p);
#if TORRENT_USE_IPV6
else if (ip_ent->string_length() == int(address_v6::bytes_type().size()))
resp.external_ip = detail::read_v6_address(p);
#endif
}
return resp;
}
bool is_valid() const
{
return !t_hash.is_all_zeros()
&& !peer_id.is_all_zeros();
}
