I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include <fstream>
#include <algorithm>
#include <cryptopp/dh.h>
#include <cryptopp/gzip.h>
#include "Log.h"
#include "util.h"
#include "Destination.h"
namespace i2p
{
namespace stream
{
StreamingDestination::StreamingDestination (boost::asio::io_service& service, bool isPublic):
m_Service (service), m_CurrentOutboundTunnel (nullptr), m_LeaseSet (nullptr), m_IsPublic (isPublic)
{
m_Keys = i2p::data::PrivateKeys::CreateRandomKeys (/*i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA256_P256*/); // uncomment for ECDSA
CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
dh.GenerateKeyPair(i2p::context.GetRandomNumberGenerator (), m_EncryptionPrivateKey, m_EncryptionPublicKey);
m_Pool = i2p::tunnel::tunnels.CreateTunnelPool (*this, 3); // 3-hops tunnel
if (m_IsPublic)
LogPrint ("Local address ", GetIdentHash ().ToBase32 (), ".b32.i2p created");
}
StreamingDestination::StreamingDestination (boost::asio::io_service& service, const std::string& fullPath, bool isPublic):
m_Service (service), m_CurrentOutboundTunnel (nullptr), m_LeaseSet (nullptr), m_IsPublic (isPublic)
{
std::ifstream s(fullPath.c_str (), std::ifstream::binary);
if (s.is_open ())
{
s.seekg (0, std::ios::end);
size_t len = s.tellg();
s.seekg (0, std::ios::beg);
uint8_t * buf = new uint8_t[len];
s.read ((char *)buf, len);
m_Keys.FromBuffer (buf, len);
delete[] buf;
LogPrint ("Local address ", GetIdentHash ().ToBase32 (), ".b32.i2p loaded");
}
else
{
LogPrint ("Can't open file ", fullPath, " Creating new one");
m_Keys = i2p::data::PrivateKeys::CreateRandomKeys (/*i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA256_P256*/);
std::ofstream f (fullPath, std::ofstream::binary | std::ofstream::out);
size_t len = m_Keys.GetFullLen ();
uint8_t * buf = new uint8_t[len];
len = m_Keys.ToBuffer (buf, len);
f.write ((char *)buf, len);
delete[] buf;
LogPrint ("New private keys file ", fullPath, " for ", m_Keys.GetPublic ().GetIdentHash ().ToBase32 (), ".b32.i2p created");
}
CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
dh.GenerateKeyPair(i2p::context.GetRandomNumberGenerator (), m_EncryptionPrivateKey, m_EncryptionPublicKey);
m_Pool = i2p::tunnel::tunnels.CreateTunnelPool (*this, 3); // 3-hops tunnel
}
StreamingDestination::StreamingDestination (boost::asio::io_service& service, const i2p::data::PrivateKeys& keys, bool isPublic):
m_Service (service), m_Keys (keys), m_CurrentOutboundTunnel (nullptr), m_LeaseSet (nullptr), m_IsPublic (isPublic)
{
CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
dh.GenerateKeyPair(i2p::context.GetRandomNumberGenerator (), m_EncryptionPrivateKey, m_EncryptionPublicKey);
m_Pool = i2p::tunnel::tunnels.CreateTunnelPool (*this, 3); // 3-hops tunnel
if (m_IsPublic)
LogPrint ("Local address ", GetIdentHash ().ToBase32 (), ".b32.i2p created");
}
StreamingDestination::~StreamingDestination ()
{
{
std::unique_lock<std::mutex> l(m_StreamsMutex);
for (auto it: m_Streams)
delete it.second;
m_Streams.clear ();
}
if (m_Pool)
i2p::tunnel::tunnels.DeleteTunnelPool (m_Pool);
delete m_LeaseSet;
}
void StreamingDestination::SendTunnelDataMsgs (const std::vector<i2p::tunnel::TunnelMessageBlock>& msgs)
{
m_CurrentOutboundTunnel = m_Pool->GetNextOutboundTunnel (m_CurrentOutboundTunnel);
if (m_CurrentOutboundTunnel)
m_CurrentOutboundTunnel->SendTunnelDataMsg (msgs);
else
{
LogPrint ("No outbound tunnels in the pool");
for (auto it: msgs)
DeleteI2NPMessage (it.data);
}
}
void StreamingDestination::HandleNextPacket (Packet * packet)
{
uint32_t sendStreamID = packet->GetSendStreamID ();
if (sendStreamID)
{
auto it = m_Streams.find (sendStreamID);
if (it != m_Streams.end ())
it->second->HandleNextPacket (packet);
else
{
LogPrint ("Unknown stream ", sendStreamID);
delete packet;
}
}
else // new incoming stream
{
auto incomingStream = CreateNewIncomingStream ();
incomingStream->HandleNextPacket (packet);
if (m_Acceptor != nullptr)
m_Acceptor (incomingStream);
else
{
LogPrint ("Acceptor for incoming stream is not set");
DeleteStream (incomingStream);
}
}
}
Stream * StreamingDestination::CreateNewOutgoingStream (const i2p::data::LeaseSet& remote)
{
Stream * s = new Stream (m_Service, *this, remote);
std::unique_lock<std::mutex> l(m_StreamsMutex);
m_Streams[s->GetRecvStreamID ()] = s;
return s;
}
Stream * StreamingDestination::CreateNewIncomingStream ()
{
Stream * s = new Stream (m_Service, *this);
std::unique_lock<std::mutex> l(m_StreamsMutex);
m_Streams[s->GetRecvStreamID ()] = s;
return s;
}
void StreamingDestination::DeleteStream (Stream * stream)
{
if (stream)
{
std::unique_lock<std::mutex> l(m_StreamsMutex);
auto it = m_Streams.find (stream->GetRecvStreamID ());
if (it != m_Streams.end ())
{
m_Streams.erase (it);
delete stream;
}
}
}
const i2p::data::LeaseSet * StreamingDestination::GetLeaseSet ()
{
if (!m_Pool) return nullptr;
if (!m_LeaseSet)
UpdateLeaseSet ();
return m_LeaseSet;
}
void StreamingDestination::UpdateLeaseSet ()
{
auto newLeaseSet = new i2p::data::LeaseSet (*m_Pool);
if (!m_LeaseSet)
m_LeaseSet = newLeaseSet;
else
{
// TODO: implement it better
*m_LeaseSet = *newLeaseSet;
delete newLeaseSet;
}
}
void StreamingDestination::HandleDataMessage (const uint8_t * buf, size_t len)
{
uint32_t length = be32toh (*(uint32_t *)buf);
buf += 4;
// we assume I2CP payload
if (buf[9] == 6) // streaming protocol
{
// unzip it
CryptoPP::Gunzip decompressor;
decompressor.Put (buf, length);
decompressor.MessageEnd();
Packet * uncompressed = new Packet;
uncompressed->offset = 0;
uncompressed->len = decompressor.MaxRetrievable ();
if (uncompressed->len > MAX_PACKET_SIZE)
{
LogPrint ("Received packet size ", uncompressed->len, " exceeds max packet size");
uncompressed->len = MAX_PACKET_SIZE;
}
decompressor.Get (uncompressed->buf, uncompressed->len);
// then forward to streaming thread
m_Service.post (boost::bind (&StreamingDestination::HandleNextPacket, this, uncompressed));
}
else
LogPrint ("Data: unexpected protocol ", buf[9]);
}
void StreamingDestination::SetLeaseSetUpdated ()
{
UpdateLeaseSet ();
for (auto it: m_Streams)
it.second->SetLeaseSetUpdated ();
if (m_IsPublic)
i2p::data::netdb.PublishLeaseSet (m_LeaseSet, m_Pool);
}
StreamingDestinations destinations;
void StreamingDestinations::Start ()
{
if (!m_SharedLocalDestination)
{
m_SharedLocalDestination = new StreamingDestination (m_Service, false); // non-public
m_Destinations[m_SharedLocalDestination->GetIdentity ().GetIdentHash ()] = m_SharedLocalDestination;
}
// LoadLocalDestinations ();
m_IsRunning = true;
m_Thread = new std::thread (std::bind (&StreamingDestinations::Run, this));
}
void StreamingDestinations::Stop ()
{
for (auto it: m_Destinations)
delete it.second;
m_Destinations.clear ();
m_SharedLocalDestination = 0; // deleted through m_Destination
m_IsRunning = false;
m_Service.stop ();
if (m_Thread)
{
m_Thread->join ();
delete m_Thread;
m_Thread = 0;
}
}
void StreamingDestinations::Run ()
{
m_Service.run ();
}
void StreamingDestinations::LoadLocalDestinations ()
{
int numDestinations = 0;
boost::filesystem::path p (i2p::util::filesystem::GetDataDir());
boost::filesystem::directory_iterator end;
for (boost::filesystem::directory_iterator it (p); it != end; ++it)
{
if (boost::filesystem::is_regular_file (*it) && it->path ().extension () == ".dat")
{
auto fullPath =
#if BOOST_VERSION > 10500
it->path().string();
#else
it->path();
#endif
auto localDestination = new StreamingDestination (m_Service, fullPath, true);
m_Destinations[localDestination->GetIdentHash ()] = localDestination;
numDestinations++;
}
}
if (numDestinations > 0)
LogPrint (numDestinations, " local destinations loaded");
}
StreamingDestination * StreamingDestinations::LoadLocalDestination (const std::string& filename, bool isPublic)
{
auto localDestination = new StreamingDestination (m_Service, i2p::util::filesystem::GetFullPath (filename), isPublic);
std::unique_lock<std::mutex> l(m_DestinationsMutex);
m_Destinations[localDestination->GetIdentHash ()] = localDestination;
return localDestination;
}
StreamingDestination * StreamingDestinations::CreateNewLocalDestination (bool isPublic)
{
auto localDestination = new StreamingDestination (m_Service, isPublic);
std::unique_lock<std::mutex> l(m_DestinationsMutex);
m_Destinations[localDestination->GetIdentHash ()] = localDestination;
return localDestination;
}
void StreamingDestinations::DeleteLocalDestination (StreamingDestination * destination)
{
if (!destination) return;
auto it = m_Destinations.find (destination->GetIdentHash ());
if (it != m_Destinations.end ())
{
auto d = it->second;
{
std::unique_lock<std::mutex> l(m_DestinationsMutex);
m_Destinations.erase (it);
}
delete d;
}
}
StreamingDestination * StreamingDestinations::CreateNewLocalDestination (const i2p::data::PrivateKeys& keys, bool isPublic)
{
auto it = m_Destinations.find (keys.GetPublic ().GetIdentHash ());
if (it != m_Destinations.end ())
{
LogPrint ("Local destination ", keys.GetPublic ().GetIdentHash ().ToBase32 (), ".b32.i2p exists");
return nullptr;
}
auto localDestination = new StreamingDestination (m_Service, keys, isPublic);
std::unique_lock<std::mutex> l(m_DestinationsMutex);
m_Destinations[keys.GetPublic ().GetIdentHash ()] = localDestination;
return localDestination;
}
Stream * StreamingDestinations::CreateClientStream (const i2p::data::LeaseSet& remote)
{
if (!m_SharedLocalDestination) return nullptr;
return m_SharedLocalDestination->CreateNewOutgoingStream (remote);
}
void StreamingDestinations::DeleteStream (Stream * stream)
{
if (stream)
stream->GetLocalDestination ().DeleteStream (stream);
}
StreamingDestination * StreamingDestinations::FindLocalDestination (const i2p::data::IdentHash& destination) const
{
auto it = m_Destinations.find (destination);
if (it != m_Destinations.end ())
return it->second;
return nullptr;
}
Stream * CreateStream (const i2p::data::LeaseSet& remote)
{
return destinations.CreateClientStream (remote);
}
void DeleteStream (Stream * stream)
{
destinations.DeleteStream (stream);
}
void StartStreaming ()
{
destinations.Start ();
}
void StopStreaming ()
{
destinations.Stop ();
}
StreamingDestination * GetSharedLocalDestination ()
{
return destinations.GetSharedLocalDestination ();
}
StreamingDestination * CreateNewLocalDestination (bool isPublic)
{
return destinations.CreateNewLocalDestination (isPublic);
}
StreamingDestination * CreateNewLocalDestination (const i2p::data::PrivateKeys& keys, bool isPublic)
{
return destinations.CreateNewLocalDestination (keys, isPublic);
}
void DeleteLocalDestination (StreamingDestination * destination)
{
destinations.DeleteLocalDestination (destination);
}
StreamingDestination * FindLocalDestination (const i2p::data::IdentHash& destination)
{
return destinations.FindLocalDestination (destination);
}
StreamingDestination * LoadLocalDestination (const std::string& filename, bool isPublic)
{
return destinations.LoadLocalDestination (filename, isPublic);
}
const StreamingDestinations& GetLocalDestinations ()
{
return destinations;
}
I2NPMessage * CreateDataMessage (Stream * s, const uint8_t * payload, size_t len)
{
I2NPMessage * msg = NewI2NPShortMessage ();
CryptoPP::Gzip compressor; // DEFAULT_DEFLATE_LEVEL
if (len <= COMPRESSION_THRESHOLD_SIZE)
compressor.SetDeflateLevel (CryptoPP::Gzip::MIN_DEFLATE_LEVEL);
compressor.Put (payload, len);
compressor.MessageEnd();
int size = compressor.MaxRetrievable ();
uint8_t * buf = msg->GetPayload ();
*(uint32_t *)buf = htobe32 (size); // length
buf += 4;
compressor.Get (buf, size);
memset (buf + 4, 0, 4); // source and destination ports. TODO: fill with proper values later
buf[9] = 6; // streaming protocol
msg->len += size + 4;
FillI2NPMessageHeader (msg, eI2NPData);
return msg;
}
}
}