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I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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i2pd/Streaming.h

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#ifndef STREAMING_H__
#define STREAMING_H__
#include <inttypes.h>
#include <string>
#include <sstream>
#include <map>
#include <set>
#include <queue>
#include <functional>
#include <memory>
#include <mutex>
#include <boost/asio.hpp>
#include "Base.h"
#include "I2PEndian.h"
#include "Identity.h"
#include "LeaseSet.h"
#include "I2NPProtocol.h"
#include "Garlic.h"
#include "Tunnel.h"
namespace i2p
{
namespace client
{
class ClientDestination;
}
namespace stream
{
const uint16_t PACKET_FLAG_SYNCHRONIZE = 0x0001;
const uint16_t PACKET_FLAG_CLOSE = 0x0002;
const uint16_t PACKET_FLAG_RESET = 0x0004;
const uint16_t PACKET_FLAG_SIGNATURE_INCLUDED = 0x0008;
const uint16_t PACKET_FLAG_SIGNATURE_REQUESTED = 0x0010;
const uint16_t PACKET_FLAG_FROM_INCLUDED = 0x0020;
const uint16_t PACKET_FLAG_DELAY_REQUESTED = 0x0040;
const uint16_t PACKET_FLAG_MAX_PACKET_SIZE_INCLUDED = 0x0080;
const uint16_t PACKET_FLAG_PROFILE_INTERACTIVE = 0x0100;
const uint16_t PACKET_FLAG_ECHO = 0x0200;
const uint16_t PACKET_FLAG_NO_ACK = 0x0400;
const size_t STREAMING_MTU = 1730;
const size_t MAX_PACKET_SIZE = 4096;
const size_t COMPRESSION_THRESHOLD_SIZE = 66;
const int ACK_SEND_TIMEOUT = 200; // in milliseconds
const int MAX_NUM_RESEND_ATTEMPTS = 6;
const int WINDOW_SIZE = 6; // in messages
const int MIN_WINDOW_SIZE = 1;
const int MAX_WINDOW_SIZE = 128;
const int INITIAL_RTT = 8000; // in milliseconds
const int INITIAL_RTO = 9000; // in milliseconds
const size_t MAX_PENDING_INCOMING_BACKLOG = 128;
const int PENDING_INCOMING_TIMEOUT = 10; // in seconds
const int MAX_RECEIVE_TIMEOUT = 30; // in seconds
/** i2cp option for limiting inbound stremaing connections */
const char I2CP_PARAM_STREAMING_MAX_CONNS_PER_MIN[] = "maxconns";
/** default maximum connections attempts per minute per destination */
const uint32_t DEFAULT_MAX_CONNS_PER_MIN = 600;
/**
* max banned destinations per local destination
* TODO: make configurable
*/
const uint16_t MAX_BANNED_CONNS = 9999;
/**
* length of a ban in ms
* TODO: make configurable
*/
const uint64_t DEFAULT_BAN_INTERVAL = 60 * 60 * 1000;
struct Packet
{
size_t len, offset;
uint8_t buf[MAX_PACKET_SIZE];
uint64_t sendTime;
Packet (): len (0), offset (0), sendTime (0) {};
uint8_t * GetBuffer () { return buf + offset; };
size_t GetLength () const { return len - offset; };
uint32_t GetSendStreamID () const { return bufbe32toh (buf); };
uint32_t GetReceiveStreamID () const { return bufbe32toh (buf + 4); };
uint32_t GetSeqn () const { return bufbe32toh (buf + 8); };
uint32_t GetAckThrough () const { return bufbe32toh (buf + 12); };
uint8_t GetNACKCount () const { return buf[16]; };
uint32_t GetNACK (int i) const { return bufbe32toh (buf + 17 + 4 * i); };
const uint8_t * GetOption () const { return buf + 17 + GetNACKCount ()*4 + 3; }; // 3 = resendDelay + flags
uint16_t GetFlags () const { return bufbe16toh (GetOption () - 2); };
uint16_t GetOptionSize () const { return bufbe16toh (GetOption ()); };
const uint8_t * GetOptionData () const { return GetOption () + 2; };
const uint8_t * GetPayload () const { return GetOptionData () + GetOptionSize (); };
bool IsSYN () const { return GetFlags () & PACKET_FLAG_SYNCHRONIZE; };
bool IsNoAck () const { return GetFlags () & PACKET_FLAG_NO_ACK; };
};
struct PacketCmp
{
bool operator() (const Packet * p1, const Packet * p2) const
{
return p1->GetSeqn () < p2->GetSeqn ();
};
};
enum StreamStatus
{
eStreamStatusNew = 0,
eStreamStatusOpen,
eStreamStatusReset,
eStreamStatusClosing,
eStreamStatusClosed
};
class StreamingDestination;
class Stream: public std::enable_shared_from_this<Stream>
{
public:
typedef std::function<void (const boost::system::error_code& ecode)> SendHandler;
Stream (boost::asio::io_service& service, StreamingDestination& local,
std::shared_ptr<const i2p::data::LeaseSet> remote, int port = 0); // outgoing
Stream (boost::asio::io_service& service, StreamingDestination& local); // incoming
~Stream ();
uint32_t GetSendStreamID () const { return m_SendStreamID; };
uint32_t GetRecvStreamID () const { return m_RecvStreamID; };
std::shared_ptr<const i2p::data::LeaseSet> GetRemoteLeaseSet () const { return m_RemoteLeaseSet; };
std::shared_ptr<const i2p::data::IdentityEx> GetRemoteIdentity () const { return m_RemoteIdentity; };
bool IsOpen () const { return m_Status == eStreamStatusOpen; };
bool IsEstablished () const { return m_SendStreamID; };
StreamStatus GetStatus () const { return m_Status; };
StreamingDestination& GetLocalDestination () { return m_LocalDestination; };
void HandleNextPacket (Packet * packet);
size_t Send (const uint8_t * buf, size_t len);
void AsyncSend (const uint8_t * buf, size_t len, SendHandler handler);
template<typename Buffer, typename ReceiveHandler>
void AsyncReceive (const Buffer& buffer, ReceiveHandler handler, int timeout = 0);
size_t ReadSome (uint8_t * buf, size_t len) { return ConcatenatePackets (buf, len); };
void Close ();
void Cancel () { m_ReceiveTimer.cancel (); };
size_t GetNumSentBytes () const { return m_NumSentBytes; };
size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
size_t GetSendQueueSize () const { return m_SentPackets.size (); };
size_t GetReceiveQueueSize () const { return m_ReceiveQueue.size (); };
size_t GetSendBufferSize () const { return m_SendBuffer.rdbuf ()->in_avail (); };
int GetWindowSize () const { return m_WindowSize; };
int GetRTT () const { return m_RTT; };
/** don't call me */
void Terminate ();
private:
void SendBuffer ();
void SendQuickAck ();
void SendClose ();
bool SendPacket (Packet * packet);
void SendPackets (const std::vector<Packet *>& packets);
void SendUpdatedLeaseSet ();
void SavePacket (Packet * packet);
void ProcessPacket (Packet * packet);
void ProcessAck (Packet * packet);
size_t ConcatenatePackets (uint8_t * buf, size_t len);
void UpdateCurrentRemoteLease (bool expired = false);
template<typename Buffer, typename ReceiveHandler>
void HandleReceiveTimer (const boost::system::error_code& ecode, const Buffer& buffer, ReceiveHandler handler, int remainingTimeout);
void ScheduleResend ();
void HandleResendTimer (const boost::system::error_code& ecode);
void HandleAckSendTimer (const boost::system::error_code& ecode);
private:
boost::asio::io_service& m_Service;
uint32_t m_SendStreamID, m_RecvStreamID, m_SequenceNumber;
int32_t m_LastReceivedSequenceNumber;
StreamStatus m_Status;
bool m_IsAckSendScheduled;
StreamingDestination& m_LocalDestination;
std::shared_ptr<const i2p::data::IdentityEx> m_RemoteIdentity;
std::shared_ptr<const i2p::data::LeaseSet> m_RemoteLeaseSet;
std::shared_ptr<i2p::garlic::GarlicRoutingSession> m_RoutingSession;
std::shared_ptr<const i2p::data::Lease> m_CurrentRemoteLease;
std::shared_ptr<i2p::tunnel::OutboundTunnel> m_CurrentOutboundTunnel;
std::queue<Packet *> m_ReceiveQueue;
std::set<Packet *, PacketCmp> m_SavedPackets;
std::set<Packet *, PacketCmp> m_SentPackets;
boost::asio::deadline_timer m_ReceiveTimer, m_ResendTimer, m_AckSendTimer;
size_t m_NumSentBytes, m_NumReceivedBytes;
uint16_t m_Port;
std::mutex m_SendBufferMutex;
std::stringstream m_SendBuffer;
int m_WindowSize, m_RTT, m_RTO;
uint64_t m_LastWindowSizeIncreaseTime;
int m_NumResendAttempts;
SendHandler m_SendHandler;
};
class StreamingDestination: public std::enable_shared_from_this<StreamingDestination>
{
public:
typedef std::function<void (std::shared_ptr<Stream>)> Acceptor;
StreamingDestination (std::shared_ptr<i2p::client::ClientDestination> owner, uint16_t localPort = 0, bool gzip = true);
~StreamingDestination ();
void Start ();
void Stop ();
std::shared_ptr<Stream> CreateNewOutgoingStream (std::shared_ptr<const i2p::data::LeaseSet> remote, int port = 0);
void DeleteStream (std::shared_ptr<Stream> stream);
void SetAcceptor (const Acceptor& acceptor);
void ResetAcceptor ();
bool IsAcceptorSet () const { return m_Acceptor != nullptr; };
std::shared_ptr<i2p::client::ClientDestination> GetOwner () const { return m_Owner; };
void SetOwner (std::shared_ptr<i2p::client::ClientDestination> owner) { m_Owner = owner; };
uint16_t GetLocalPort () const { return m_LocalPort; };
void HandleDataMessagePayload (const uint8_t * buf, size_t len);
std::shared_ptr<I2NPMessage> CreateDataMessage (const uint8_t * payload, size_t len, uint16_t toPort);
/** set max connections per minute per destination */
void SetMaxConnsPerMinute(const uint32_t conns);
private:
void HandleNextPacket (Packet * packet);
std::shared_ptr<Stream> CreateNewIncomingStream ();
void HandlePendingIncomingTimer (const boost::system::error_code& ecode);
/** handle cleaning up connection tracking for ratelimits */
void HandleConnTrack(const boost::system::error_code& ecode);
bool DropNewStream(const i2p::data::IdentHash & ident);
void ScheduleConnTrack();
private:
std::shared_ptr<i2p::client::ClientDestination> m_Owner;
uint16_t m_LocalPort;
bool m_Gzip; // gzip compression of data messages
std::mutex m_StreamsMutex;
std::map<uint32_t, std::shared_ptr<Stream> > m_Streams; // sendStreamID->stream
Acceptor m_Acceptor;
uint32_t m_LastIncomingReceiveStreamID;
std::list<std::shared_ptr<Stream> > m_PendingIncomingStreams;
boost::asio::deadline_timer m_PendingIncomingTimer;
std::map<uint32_t, std::list<Packet *> > m_SavedPackets; // receiveStreamID->packets, arrived before SYN
std::mutex m_ConnsMutex;
/** how many connections per minute did each identity have */
std::map<i2p::data::IdentHash, uint32_t> m_Conns;
boost::asio::deadline_timer m_ConnTrackTimer;
uint32_t m_ConnsPerMinute;
/** banned identities */
std::vector<i2p::data::IdentHash> m_Banned;
uint64_t m_LastBanClear;
public:
i2p::data::GzipInflator m_Inflator;
i2p::data::GzipDeflator m_Deflator;
// for HTTP only
const decltype(m_Streams)& GetStreams () const { return m_Streams; };
};
//-------------------------------------------------
template<typename Buffer, typename ReceiveHandler>
void Stream::AsyncReceive (const Buffer& buffer, ReceiveHandler handler, int timeout)
{
auto s = shared_from_this();
m_Service.post ([=](void)
{
if (!m_ReceiveQueue.empty () || m_Status == eStreamStatusReset)
s->HandleReceiveTimer (boost::asio::error::make_error_code (boost::asio::error::operation_aborted), buffer, handler, 0);
else
{
int t = (timeout > MAX_RECEIVE_TIMEOUT) ? MAX_RECEIVE_TIMEOUT : timeout;
s->m_ReceiveTimer.expires_from_now (boost::posix_time::seconds(t));
s->m_ReceiveTimer.async_wait ([=](const boost::system::error_code& ecode)
{ s->HandleReceiveTimer (ecode, buffer, handler, timeout - t); });
}
});
}
template<typename Buffer, typename ReceiveHandler>
void Stream::HandleReceiveTimer (const boost::system::error_code& ecode, const Buffer& buffer, ReceiveHandler handler, int remainingTimeout)
{
size_t received = ConcatenatePackets (boost::asio::buffer_cast<uint8_t *>(buffer), boost::asio::buffer_size(buffer));
if (received > 0)
handler (boost::system::error_code (), received);
else if (ecode == boost::asio::error::operation_aborted)
{
// timeout not expired
if (m_Status == eStreamStatusReset)
handler (boost::asio::error::make_error_code (boost::asio::error::connection_reset), 0);
else
handler (boost::asio::error::make_error_code (boost::asio::error::operation_aborted), 0);
}
else
{
// timeout expired
if (remainingTimeout <= 0)
handler (boost::asio::error::make_error_code (boost::asio::error::timed_out), received);
else
{
// itermediate iterrupt
SendUpdatedLeaseSet (); // send our leaseset if applicable
AsyncReceive (buffer, handler, remainingTimeout);
}
}
}
}
}
#endif