void Ctransaction::send_connect(data_ref r)
{
if (read_int(8, &r[uti_connection_id], r.end()) != 0x41727101980ll)
return;
const int cb_d = 2 << 10;
char d[cb_d];
write_int(4, d + uto_action, uta_connect);
write_int(4, d + uto_transaction_id, read_int(4, &r[uti_transaction_id], r.end()));
write_int(8, d + utoc_connection_id, connection_id());
send(data_ref(d, utoc_size));
}
void Cvirtual_binary::assign(data_ref v)
{
if (v.size())
{
m_source = boost::make_shared<Cvirtual_binary_source>(v.size());
if (v.begin())
memcpy(data_edit(), v.data(), v.size());
}
else
m_source.reset();
}
shared_data xcc_z::gzip(data_ref s)
{
unsigned long cb_d = s.size() + (s.size() + 999) / 1000 + 12;
shared_data d(10 + cb_d + 8);
unsigned char* w = d.data();
*w++ = 0x1f;
*w++ = 0x8b;
*w++ = Z_DEFLATED;
*w++ = 0;
*w++ = 0;
*w++ = 0;
*w++ = 0;
*w++ = 0;
*w++ = 0;
*w++ = 3;
{
z_stream stream;
stream.zalloc = NULL;
stream.zfree = NULL;
stream.opaque = NULL;
deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -MAX_WBITS, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
stream.next_in = const_cast<unsigned char*>(s.begin());
stream.avail_in = s.size();
stream.next_out = w;
stream.avail_out = cb_d;
deflate(&stream, Z_FINISH);
deflateEnd(&stream);
w = stream.next_out;
}
w = write_int_le(4, w, crc32(crc32(0, NULL, 0), s.data(), s.size()));
w = write_int_le(4, w, s.size());
return d.substr(0, w - d.data());
}
void Ctransaction::send_error(data_ref r, const std::string& msg)
{
const int cb_d = 2 << 10;
char d[cb_d];
write_int(4, d + uto_action, uta_error);
write_int(4, d + uto_transaction_id, read_int(4, &r[uti_transaction_id], r.end()));
memcpy(d + utoe_size, msg.data(), msg.size());
send(data_ref(d, utoe_size + msg.size()));
}
shared_data xcc_z::gunzip(data_ref s)
{
if (s.size() < 18)
return shared_data();
shared_data d(read_int_le(4, s.end() - 4));
z_stream stream;
stream.zalloc = NULL;
stream.zfree = NULL;
stream.opaque = NULL;
stream.next_in = const_cast<unsigned char*>(s.begin()) + 10;
stream.avail_in = s.size() - 18;
stream.next_out = d.data();
stream.avail_out = d.size();
return stream.next_out
&& Z_OK == inflateInit2(&stream, -MAX_WBITS)
&& Z_STREAM_END == inflate(&stream, Z_FINISH)
&& Z_OK == inflateEnd(&stream)
? d
: shared_data();
}
void Ctransaction::send_announce(data_ref r)
{
if (read_int(8, &r[uti_connection_id], r.end()) != connection_id())
return;
if (!m_server.config().m_anonymous_announce)
{
send_error(r, "access denied");
return;
}
Ctracker_input ti;
ti.m_downloaded = read_int(8, &r[utia_downloaded], r.end());
ti.m_event = static_cast<Ctracker_input::t_event>(read_int(4, &r[utia_event], r.end()));
ti.m_info_hash.assign(reinterpret_cast<const char*>(&r[utia_info_hash]), 20);
ti.m_ipa = read_int(4, &r[utia_ipa], r.end()) && is_private_ipa(m_a.sin_addr.s_addr)
? htonl(read_int(4, &r[utia_ipa], r.end()))
: m_a.sin_addr.s_addr;
ti.m_left = read_int(8, &r[utia_left], r.end());
ti.m_num_want = read_int(4, &r[utia_num_want], r.end());
ti.m_peer_id.assign(reinterpret_cast<const char*>(&r[utia_peer_id]), 20);
ti.m_port = htons(read_int(2, &r[utia_port], r.end()));
ti.m_uploaded = read_int(8, &r[utia_uploaded], r.end());
std::string error = m_server.insert_peer(ti, true, NULL);
if (!error.empty())
{
send_error(r, error);
return;
}
const Cserver::t_torrent* torrent = m_server.torrent(ti.m_info_hash);
if (!torrent)
return;
const int cb_d = 2 << 10;
char d[cb_d];
write_int(4, d + uto_action, uta_announce);
write_int(4, d + uto_transaction_id, read_int(4, &r[uti_transaction_id], r.end()));
write_int(4, d + utoa_interval, m_server.config().m_announce_interval);
write_int(4, d + utoa_leechers, torrent->leechers);
write_int(4, d + utoa_seeders, torrent->seeders);
std::string peers = torrent->select_peers(ti);
memcpy(d + utoa_size, peers.data(), peers.size());
send(data_ref(d, d + utoa_size + peers.size()));
}
void Ctransaction::send_scrape(data_ref r)
{
if (read_int(8, &r[uti_connection_id], r.end()) != connection_id())
return;
if (!m_server.config().m_anonymous_scrape)
{
send_error(r, "access denied");
return;
}
const int cb_d = 2 << 10;
char d[cb_d];
write_int(4, d + uto_action, uta_scrape);
write_int(4, d + uto_transaction_id, read_int(4, &r[uti_transaction_id], r.end()));
char* w = d + utos_size;
for (r.advance_begin(utis_size); r.size() >= 20 && w + 12 <= d + cb_d; r.advance_begin(20))
{
if (const Cserver::t_torrent* t = m_server.torrent(r.substr(0, 20).s()))
{
w = write_int(4, w, t->seeders);
w = write_int(4, w, t->completed);
w = write_int(4, w, t->leechers);
}
else
{
w = write_int(4, w, 0);
w = write_int(4, w, 0);
w = write_int(4, w, 0);
}
}
m_server.stats().scraped_udp++;
send(data_ref(d, w));
}
int Cfile32::write(data_ref v)
{
return write(v.data(), v.size());
};
void Ctransaction::send(data_ref b)
{
if (m_s.sendto(b, reinterpret_cast<const sockaddr*>(&m_a), sizeof(sockaddr_in)) != b.size())
std::cerr << "send failed: " << Csocket::error2a(WSAGetLastError()) << std::endl;
}