mirror of
https://github.com/PurpleI2P/i2pd
synced 2024-11-10 08:00:38 +03:00
285 lines
10 KiB
C++
285 lines
10 KiB
C++
#ifndef STREAMING_H__
|
|
#define STREAMING_H__
|
|
|
|
#include <inttypes.h>
|
|
#include <string>
|
|
#include <map>
|
|
#include <set>
|
|
#include <queue>
|
|
#include <thread>
|
|
#include <functional>
|
|
#include <boost/asio.hpp>
|
|
#include <boost/bind.hpp>
|
|
#include <cryptopp/dsa.h>
|
|
#include "I2PEndian.h"
|
|
#include "Identity.h"
|
|
#include "LeaseSet.h"
|
|
#include "I2NPProtocol.h"
|
|
#include "TunnelPool.h"
|
|
#include "Garlic.h"
|
|
|
|
namespace i2p
|
|
{
|
|
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 RESEND_TIMEOUT = 10; // in seconds
|
|
const int MAX_NUM_RESEND_ATTEMPTS = 5;
|
|
|
|
struct Packet
|
|
{
|
|
uint8_t buf[MAX_PACKET_SIZE];
|
|
size_t len, offset;
|
|
int numResendAttempts;
|
|
|
|
Packet (): len (0), offset (0), numResendAttempts (0) {};
|
|
uint8_t * GetBuffer () { return buf + offset; };
|
|
size_t GetLength () const { return len - offset; };
|
|
|
|
uint32_t GetSendStreamID () const { return be32toh (*(uint32_t *)buf); };
|
|
uint32_t GetReceiveStreamID () const { return be32toh (*(uint32_t *)(buf + 4)); };
|
|
uint32_t GetSeqn () const { return be32toh (*(uint32_t *)(buf + 8)); };
|
|
uint32_t GetAckThrough () const { return be32toh (*(uint32_t *)(buf + 12)); };
|
|
uint8_t GetNACKCount () const { return buf[16]; };
|
|
uint32_t GetNACK (int i) const { return be32toh (((uint32_t *)(buf + 17))[i]); };
|
|
const uint8_t * GetOption () const { return buf + 17 + GetNACKCount ()*4 + 3; }; // 3 = resendDelay + flags
|
|
uint16_t GetFlags () const { return be16toh (*(uint16_t *)(GetOption () - 2)); };
|
|
uint16_t GetOptionSize () const { return be16toh (*(uint16_t *)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 ();
|
|
};
|
|
};
|
|
|
|
class StreamingDestination;
|
|
class Stream
|
|
{
|
|
public:
|
|
|
|
Stream (boost::asio::io_service& service, StreamingDestination * local, const i2p::data::LeaseSet& remote); // 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; };
|
|
const i2p::data::LeaseSet * GetRemoteLeaseSet () const { return m_RemoteLeaseSet; };
|
|
const i2p::data::IdentityEx& GetRemoteIdentity () const { return m_RemoteIdentity; };
|
|
bool IsOpen () const { return m_IsOpen; };
|
|
bool IsEstablished () const { return m_SendStreamID; };
|
|
StreamingDestination * GetLocalDestination () { return m_LocalDestination; };
|
|
|
|
void HandleNextPacket (Packet * packet);
|
|
size_t Send (const uint8_t * buf, size_t len, int timeout); // timeout in seconds
|
|
|
|
template<typename Buffer, typename ReceiveHandler>
|
|
void AsyncReceive (const Buffer& buffer, ReceiveHandler handler, int timeout = 0);
|
|
|
|
void Close ();
|
|
|
|
void SetLeaseSetUpdated () { m_LeaseSetUpdated = true; };
|
|
|
|
private:
|
|
|
|
void SendQuickAck ();
|
|
bool SendPacket (Packet * packet);
|
|
void SendPackets (const std::vector<Packet *>& packets);
|
|
|
|
void SavePacket (Packet * packet);
|
|
void ProcessPacket (Packet * packet);
|
|
void ProcessAck (Packet * packet);
|
|
size_t ConcatenatePackets (uint8_t * buf, size_t len);
|
|
|
|
void UpdateCurrentRemoteLease ();
|
|
|
|
template<typename Buffer, typename ReceiveHandler>
|
|
void HandleReceiveTimer (const boost::system::error_code& ecode, const Buffer& buffer, ReceiveHandler handler);
|
|
|
|
void ScheduleResend ();
|
|
void HandleResendTimer (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;
|
|
bool m_IsOpen, m_LeaseSetUpdated;
|
|
StreamingDestination * m_LocalDestination;
|
|
i2p::data::IdentityEx m_RemoteIdentity;
|
|
const i2p::data::LeaseSet * m_RemoteLeaseSet;
|
|
i2p::garlic::GarlicRoutingSession * m_RoutingSession;
|
|
i2p::data::Lease m_CurrentRemoteLease;
|
|
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;
|
|
};
|
|
|
|
class StreamingDestination: public i2p::data::LocalDestination
|
|
{
|
|
public:
|
|
|
|
StreamingDestination (boost::asio::io_service& service, bool isPublic);
|
|
StreamingDestination (boost::asio::io_service& service, const std::string& fullPath);
|
|
StreamingDestination (boost::asio::io_service& service, const i2p::data::PrivateKeys& keys, bool isPublic);
|
|
~StreamingDestination ();
|
|
|
|
const i2p::data::LeaseSet * GetLeaseSet ();
|
|
i2p::tunnel::TunnelPool * GetTunnelPool () const { return m_Pool; };
|
|
|
|
Stream * CreateNewOutgoingStream (const i2p::data::LeaseSet& remote);
|
|
void DeleteStream (Stream * stream);
|
|
void SetAcceptor (const std::function<void (Stream *)>& acceptor) { m_Acceptor = acceptor; };
|
|
void ResetAcceptor () { m_Acceptor = nullptr; };
|
|
bool IsAcceptorSet () const { return m_Acceptor != nullptr; };
|
|
void HandleNextPacket (Packet * packet);
|
|
|
|
// implements LocalDestination
|
|
const i2p::data::PrivateKeys& GetPrivateKeys () const { return m_Keys; };
|
|
const uint8_t * GetEncryptionPrivateKey () const { return m_EncryptionPrivateKey; };
|
|
const uint8_t * GetEncryptionPublicKey () const { return m_EncryptionPublicKey; };
|
|
void SetLeaseSetUpdated ();
|
|
|
|
private:
|
|
|
|
Stream * CreateNewIncomingStream ();
|
|
void UpdateLeaseSet ();
|
|
|
|
private:
|
|
|
|
boost::asio::io_service& m_Service;
|
|
std::map<uint32_t, Stream *> m_Streams;
|
|
i2p::data::PrivateKeys m_Keys;
|
|
uint8_t m_EncryptionPublicKey[256], m_EncryptionPrivateKey[256];
|
|
|
|
i2p::tunnel::TunnelPool * m_Pool;
|
|
i2p::data::LeaseSet * m_LeaseSet;
|
|
bool m_IsPublic;
|
|
|
|
std::function<void (Stream *)> m_Acceptor;
|
|
};
|
|
|
|
class StreamingDestinations
|
|
{
|
|
public:
|
|
|
|
StreamingDestinations (): m_IsRunning (false), m_Thread (nullptr),
|
|
m_Work (m_Service), m_SharedLocalDestination (nullptr) {};
|
|
~StreamingDestinations () {};
|
|
|
|
void Start ();
|
|
void Stop ();
|
|
|
|
void HandleNextPacket (i2p::data::IdentHash destination, Packet * packet);
|
|
|
|
Stream * CreateClientStream (const i2p::data::LeaseSet& remote);
|
|
void DeleteStream (Stream * stream);
|
|
StreamingDestination * GetSharedLocalDestination () const { return m_SharedLocalDestination; };
|
|
StreamingDestination * CreateNewLocalDestination (bool isPublic);
|
|
void DeleteLocalDestination (StreamingDestination * destination);
|
|
StreamingDestination * GetLocalDestination (const i2p::data::PrivateKeys& keys, bool isPublic);
|
|
StreamingDestination * FindLocalDestination (const i2p::data::IdentHash& destination) const;
|
|
StreamingDestination * LoadLocalDestination (const std::string& filename);
|
|
|
|
private:
|
|
|
|
void Run ();
|
|
void LoadLocalDestinations ();
|
|
void PostNextPacket (i2p::data::IdentHash destination, Packet * packet);
|
|
|
|
private:
|
|
|
|
bool m_IsRunning;
|
|
std::thread * m_Thread;
|
|
boost::asio::io_service m_Service;
|
|
boost::asio::io_service::work m_Work;
|
|
|
|
std::map<i2p::data::IdentHash, StreamingDestination *> m_Destinations;
|
|
StreamingDestination * m_SharedLocalDestination;
|
|
|
|
public:
|
|
// for HTTP
|
|
const decltype(m_Destinations)& GetDestinations () const { return m_Destinations; };
|
|
};
|
|
|
|
Stream * CreateStream (const i2p::data::LeaseSet& remote);
|
|
void DeleteStream (Stream * stream);
|
|
void StartStreaming ();
|
|
void StopStreaming ();
|
|
StreamingDestination * GetSharedLocalDestination ();
|
|
StreamingDestination * CreateNewLocalDestination (bool isPublic = true);
|
|
void DeleteLocalDestination (StreamingDestination * destination);
|
|
StreamingDestination * GetLocalDestination (const i2p::data::PrivateKeys& keys, bool isPublic = true);
|
|
StreamingDestination * FindLocalDestination (const i2p::data::IdentHash& destination);
|
|
StreamingDestination * LoadLocalDestination (const std::string& filename);
|
|
// for HTTP
|
|
const StreamingDestinations& GetLocalDestinations ();
|
|
|
|
// assuming data is I2CP message
|
|
void HandleDataMessage (i2p::data::IdentHash destination, const uint8_t * buf, size_t len);
|
|
I2NPMessage * CreateDataMessage (Stream * s, const uint8_t * payload, size_t len);
|
|
|
|
//-------------------------------------------------
|
|
|
|
template<typename Buffer, typename ReceiveHandler>
|
|
void Stream::AsyncReceive (const Buffer& buffer, ReceiveHandler handler, int timeout)
|
|
{
|
|
if (!m_ReceiveQueue.empty ())
|
|
{
|
|
size_t received = ConcatenatePackets (boost::asio::buffer_cast<uint8_t *>(buffer), boost::asio::buffer_size(buffer));
|
|
if (received)
|
|
{
|
|
// TODO: post to stream's thread
|
|
handler (boost::system::error_code (), received);
|
|
return;
|
|
}
|
|
}
|
|
if (!m_IsOpen)
|
|
{
|
|
handler (boost::asio::error::make_error_code (boost::asio::error::connection_reset), 0);
|
|
return;
|
|
}
|
|
m_ReceiveTimer.expires_from_now (boost::posix_time::seconds(timeout));
|
|
m_ReceiveTimer.async_wait ([=](const boost::system::error_code& ecode)
|
|
{ this->HandleReceiveTimer (ecode, buffer, handler); });
|
|
}
|
|
|
|
template<typename Buffer, typename ReceiveHandler>
|
|
void Stream::HandleReceiveTimer (const boost::system::error_code& ecode, const Buffer& buffer, ReceiveHandler handler)
|
|
{
|
|
size_t received = ConcatenatePackets (boost::asio::buffer_cast<uint8_t *>(buffer), boost::asio::buffer_size(buffer));
|
|
if (ecode == boost::asio::error::operation_aborted)
|
|
// timeout not expired
|
|
handler (boost::system::error_code (), received);
|
|
else
|
|
// timeout expired
|
|
handler (boost::asio::error::make_error_code (boost::asio::error::timed_out), received);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|