mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
248 lines
8.5 KiB
248 lines
8.5 KiB
#ifndef STREAMING_H__ |
|
#define STREAMING_H__ |
|
|
|
#include <inttypes.h> |
|
#include <string> |
|
#include <map> |
|
#include <set> |
|
#include <queue> |
|
#include <functional> |
|
#include <memory> |
|
#include <boost/asio.hpp> |
|
#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 RESEND_TIMEOUT = 10; // in seconds |
|
const int ACK_SEND_TIMEOUT = 200; // in milliseconds |
|
const int MAX_NUM_RESEND_ATTEMPTS = 5; |
|
|
|
struct Packet |
|
{ |
|
size_t len, offset; |
|
uint8_t buf[MAX_PACKET_SIZE]; |
|
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 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 (); |
|
}; |
|
}; |
|
|
|
class StreamingDestination; |
|
class Stream: public std::enable_shared_from_this<Stream> |
|
{ |
|
public: |
|
|
|
Stream (boost::asio::io_service& service, StreamingDestination& local, |
|
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; }; |
|
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); |
|
|
|
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 (); }; |
|
|
|
private: |
|
|
|
void SendQuickAck (); |
|
bool SendPacket (Packet * packet); |
|
void PostPackets (const std::vector<Packet *> packets); |
|
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); |
|
void HandleAckSendTimer (const boost::system::error_code& ecode); |
|
|
|
I2NPMessage * CreateDataMessage (const uint8_t * payload, size_t len); |
|
|
|
private: |
|
|
|
boost::asio::io_service& m_Service; |
|
uint32_t m_SendStreamID, m_RecvStreamID, m_SequenceNumber; |
|
int32_t m_LastReceivedSequenceNumber; |
|
bool m_IsOpen, m_IsReset, m_IsAckSendScheduled; |
|
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, m_AckSendTimer; |
|
size_t m_NumSentBytes, m_NumReceivedBytes; |
|
uint16_t m_Port; |
|
}; |
|
|
|
class StreamingDestination |
|
{ |
|
public: |
|
|
|
typedef std::function<void (std::shared_ptr<Stream>)> Acceptor; |
|
|
|
StreamingDestination (i2p::client::ClientDestination& owner): m_Owner (owner) {}; |
|
~StreamingDestination () {}; |
|
|
|
void Start (); |
|
void Stop (); |
|
|
|
std::shared_ptr<Stream> CreateNewOutgoingStream (const i2p::data::LeaseSet& remote, int port = 0); |
|
void DeleteStream (std::shared_ptr<Stream> stream); |
|
void SetAcceptor (const Acceptor& acceptor) { m_Acceptor = acceptor; }; |
|
void ResetAcceptor () { m_Acceptor = nullptr; }; |
|
bool IsAcceptorSet () const { return m_Acceptor != nullptr; }; |
|
i2p::client::ClientDestination& GetOwner () { return m_Owner; }; |
|
|
|
void HandleDataMessagePayload (const uint8_t * buf, size_t len); |
|
|
|
private: |
|
|
|
void HandleNextPacket (Packet * packet); |
|
std::shared_ptr<Stream> CreateNewIncomingStream (); |
|
|
|
private: |
|
|
|
i2p::client::ClientDestination& m_Owner; |
|
std::mutex m_StreamsMutex; |
|
std::map<uint32_t, std::shared_ptr<Stream> > m_Streams; |
|
Acceptor m_Acceptor; |
|
|
|
public: |
|
|
|
// 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) |
|
{ |
|
if (!m_ReceiveQueue.empty ()) |
|
{ |
|
auto s = shared_from_this(); |
|
m_Service.post ([=](void) { s->HandleReceiveTimer ( |
|
boost::asio::error::make_error_code (boost::asio::error::operation_aborted), |
|
buffer, handler); }); |
|
} |
|
else |
|
{ |
|
m_ReceiveTimer.expires_from_now (boost::posix_time::seconds(timeout)); |
|
auto s = shared_from_this(); |
|
m_ReceiveTimer.async_wait ([=](const boost::system::error_code& ecode) |
|
{ s->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 |
|
if (m_IsOpen) |
|
// no error |
|
handler (boost::system::error_code (), received); |
|
else |
|
{ |
|
// stream closed |
|
if (m_IsReset) |
|
{ |
|
// stream closed by peer |
|
handler (received > 0 ? boost::system::error_code () : // we still have some data |
|
boost::asio::error::make_error_code (boost::asio::error::connection_reset), // no more data |
|
received); |
|
|
|
} |
|
else // stream closed by us |
|
handler (boost::asio::error::make_error_code (boost::asio::error::operation_aborted), received); |
|
} |
|
} |
|
else |
|
// timeout expired |
|
handler (boost::asio::error::make_error_code (boost::asio::error::timed_out), received); |
|
} |
|
} |
|
} |
|
|
|
#endif
|
|
|