entry dht_tracker::state() const
{
entry ret(entry::dictionary_t);
{
entry nodes(entry::list_t);
for (node_impl::iterator i(m_dht.begin())
, end(m_dht.end()); i != end; ++i)
{
std::string node;
std::back_insert_iterator<std::string> out(node);
write_endpoint(i->addr, out);
nodes.list().push_back(entry(node));
}
bucket_t cache;
m_dht.replacement_cache(cache);
for (bucket_t::iterator i(cache.begin())
, end(cache.end()); i != end; ++i)
{
std::string node;
std::back_insert_iterator<std::string> out(node);
write_endpoint(i->addr, out);
nodes.list().push_back(entry(node));
}
if (!nodes.list().empty())
ret["nodes"] = nodes;
}
ret["node-id"] = boost::lexical_cast<std::string>(m_dht.nid());
return ret;
}
entry bdecode(const path &file) {
ifstream fs(file, ifstream::binary);
if(fs.is_open()) {
fs.unsetf(ifstream::skipws);
return libtorrent::bdecode(std::istream_iterator<char>(fs), std::istream_iterator<char>());
}
else return entry();
}
void dht_tracker::send_packet(msg const& m)
try
{
using libtorrent::bencode;
using libtorrent::entry;
entry e(entry::dictionary_t);
TORRENT_ASSERT(!m.transaction_id.empty() || m.message_id == messages::error);
e["t"] = m.transaction_id;
static char const version_str[] = {'L', 'T'
, LIBTORRENT_VERSION_MAJOR, LIBTORRENT_VERSION_MINOR};
e["v"] = std::string(version_str, version_str + 4);
#ifdef TORRENT_DHT_VERBOSE_LOGGING
TORRENT_LOG(dht_tracker) << time_now_string()
<< " SENDING [" << m.addr << "]:";
TORRENT_LOG(dht_tracker) << " transaction: " << m.transaction_id;
#endif
if (m.message_id == messages::error)
{
TORRENT_ASSERT(m.reply);
e["y"] = "e";
entry error_list(entry::list_t);
TORRENT_ASSERT(m.error_code > 200 && m.error_code <= 204);
error_list.list().push_back(entry(m.error_code));
error_list.list().push_back(entry(m.error_msg));
e["e"] = error_list;
#ifdef TORRENT_DHT_VERBOSE_LOGGING
TORRENT_LOG(dht_tracker) << time_now_string()
<< " outgoing error: " << m.error_code << " " << m.error_msg;
#endif
}
else if (m.reply)
{
e["y"] = "r";
e["r"] = entry(entry::dictionary_t);
entry& r = e["r"];
r["id"] = std::string(m.id.begin(), m.id.end());
#ifdef TORRENT_DHT_VERBOSE_LOGGING
TORRENT_LOG(dht_tracker) << time_now_string()
<< " reply: " << messages::ids[m.message_id];
#endif
if (m.write_token.type() != entry::undefined_t)
r["token"] = m.write_token;
switch (m.message_id)
{
case messages::ping:
break;
case messages::find_node:
{
write_nodes_entry(r, m);
break;
}
case messages::get_peers:
{
if (m.peers.empty())
{
write_nodes_entry(r, m);
}
else
{
r["values"] = entry(entry::list_t);
entry& p = r["values"];
std::string endpoint;
for (msg::peers_t::const_iterator i = m.peers.begin()
, end(m.peers.end()); i != end; ++i)
{
endpoint.resize(18);
std::string::iterator out = endpoint.begin();
write_endpoint(*i, out);
endpoint.resize(out - endpoint.begin());
p.list().push_back(entry(endpoint));
}
#ifdef TORRENT_DHT_VERBOSE_LOGGING
TORRENT_LOG(dht_tracker) << " peers: " << m.peers.size();
#endif
}
break;
}
case messages::announce_peer:
break;
break;
}
}
else
{
e["y"] = "q";
e["a"] = entry(entry::dictionary_t);
entry& a = e["a"];
a["id"] = std::string(m.id.begin(), m.id.end());
if (m.write_token.type() != entry::undefined_t)
a["token"] = m.write_token;
TORRENT_ASSERT(m.message_id <= messages::error);
e["q"] = messages::ids[m.message_id];
#ifdef TORRENT_DHT_VERBOSE_LOGGING
TORRENT_LOG(dht_tracker) << " query: "
<< messages::ids[m.message_id];
#endif
switch (m.message_id)
{
case messages::find_node:
{
a["target"] = std::string(m.info_hash.begin(), m.info_hash.end());
#ifdef TORRENT_DHT_VERBOSE_LOGGING
TORRENT_LOG(dht_tracker) << " target: "
<< boost::lexical_cast<std::string>(m.info_hash);
#endif
break;
}
case messages::get_peers:
{
a["info_hash"] = std::string(m.info_hash.begin(), m.info_hash.end());
#ifdef TORRENT_DHT_VERBOSE_LOGGING
TORRENT_LOG(dht_tracker) << " info_hash: "
<< boost::lexical_cast<std::string>(m.info_hash);
#endif
break;
}
case messages::announce_peer:
a["port"] = m.port;
a["info_hash"] = std::string(m.info_hash.begin(), m.info_hash.end());
a["token"] = m.write_token;
#ifdef TORRENT_DHT_VERBOSE_LOGGING
TORRENT_LOG(dht_tracker)
<< " port: " << m.port
<< " info_hash: " << boost::lexical_cast<std::string>(m.info_hash);
#endif
break;
default: break;
}
}
m_send_buf.clear();
bencode(std::back_inserter(m_send_buf), e);
error_code ec;
m_socket.send_to(asio::buffer(&m_send_buf[0]
, (int)m_send_buf.size()), m.addr, 0, ec);
if (ec) return;
#ifdef TORRENT_DHT_VERBOSE_LOGGING
m_total_out_bytes += m_send_buf.size();
if (m.reply)
{
++m_replies_sent[m.message_id];
m_replies_bytes_sent[m.message_id] += int(m_send_buf.size());
}
else
{
m_queries_out_bytes += m_send_buf.size();
}
TORRENT_LOG(dht_tracker) << e;
#endif
if (!m.piggy_backed_ping) return;
msg pm;
pm.reply = false;
pm.piggy_backed_ping = false;
pm.message_id = messages::ping;
pm.transaction_id = m.ping_transaction_id;
pm.id = m.id;
pm.addr = m.addr;
send_packet(pm);
}
catch (std::exception&)
{
// m_send may fail with "no route to host"
// but it shouldn't throw since an error code
// is passed in instead
TORRENT_ASSERT(false);
}