mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2024-11-17 21:26:04 +00:00
785 lines
22 KiB
C++
785 lines
22 KiB
C++
#include <fstream>
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#include <algorithm>
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#include <cryptopp/dh.h>
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#include <cryptopp/gzip.h>
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#include "util.h"
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#include "Log.h"
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#include "RouterInfo.h"
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#include "RouterContext.h"
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#include "Tunnel.h"
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#include "Timestamp.h"
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#include "CryptoConst.h"
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#include "Garlic.h"
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#include "NetDb.h"
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#include "Streaming.h"
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namespace i2p
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{
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namespace stream
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{
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Stream::Stream (boost::asio::io_service& service, StreamingDestination * local,
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const i2p::data::LeaseSet& remote): m_Service (service), m_SendStreamID (0),
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m_SequenceNumber (0), m_LastReceivedSequenceNumber (-1), m_IsOpen (false),
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m_LeaseSetUpdated (true), m_LocalDestination (local),
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m_RemoteLeaseSet (&remote), m_CurrentOutboundTunnel (nullptr),
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m_ReceiveTimer (m_Service), m_ResendTimer (m_Service)
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{
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m_RecvStreamID = i2p::context.GetRandomNumberGenerator ().GenerateWord32 ();
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UpdateCurrentRemoteLease ();
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}
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Stream::Stream (boost::asio::io_service& service, StreamingDestination * local):
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m_Service (service), m_SendStreamID (0), m_SequenceNumber (0), m_LastReceivedSequenceNumber (-1),
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m_IsOpen (false), m_LeaseSetUpdated (true), m_LocalDestination (local),
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m_RemoteLeaseSet (nullptr), m_CurrentOutboundTunnel (nullptr),
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m_ReceiveTimer (m_Service), m_ResendTimer (m_Service)
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{
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m_RecvStreamID = i2p::context.GetRandomNumberGenerator ().GenerateWord32 ();
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}
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Stream::~Stream ()
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{
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m_ReceiveTimer.cancel ();
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m_ResendTimer.cancel ();
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while (!m_ReceiveQueue.empty ())
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{
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auto packet = m_ReceiveQueue.front ();
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m_ReceiveQueue.pop ();
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delete packet;
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}
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for (auto it: m_SavedPackets)
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delete it;
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for (auto it: m_SentPackets)
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delete it;
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}
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void Stream::HandleNextPacket (Packet * packet)
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{
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if (!m_SendStreamID)
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m_SendStreamID = packet->GetReceiveStreamID ();
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if (!packet->IsNoAck ()) // ack received
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ProcessAck (packet);
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int32_t receivedSeqn = packet->GetSeqn ();
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bool isSyn = packet->IsSYN ();
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if (!receivedSeqn && !isSyn)
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{
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// plain ack
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LogPrint ("Plain ACK received");
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delete packet;
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return;
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}
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LogPrint ("Received seqn=", receivedSeqn);
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if (isSyn || receivedSeqn == m_LastReceivedSequenceNumber + 1)
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{
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// we have received next in sequence message
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ProcessPacket (packet);
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// we should also try stored messages if any
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for (auto it = m_SavedPackets.begin (); it != m_SavedPackets.end ();)
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{
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if ((*it)->GetSeqn () == (uint32_t)(m_LastReceivedSequenceNumber + 1))
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{
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Packet * savedPacket = *it;
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m_SavedPackets.erase (it++);
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ProcessPacket (savedPacket);
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}
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else
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break;
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}
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// send ack for last message
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if (m_IsOpen)
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SendQuickAck ();
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else if (isSyn)
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// we have to send SYN back to incoming connection
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Send (nullptr, 0, 0); // also sets m_IsOpen
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}
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else
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{
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if (receivedSeqn <= m_LastReceivedSequenceNumber)
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{
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// we have received duplicate. Most likely our outbound tunnel is dead
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LogPrint ("Duplicate message ", receivedSeqn, " received");
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m_CurrentOutboundTunnel = nullptr; // pick another outbound tunnel
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UpdateCurrentRemoteLease (); // pick another lease
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SendQuickAck (); // resend ack for previous message again
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delete packet; // packet dropped
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}
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else
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{
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LogPrint ("Missing messages from ", m_LastReceivedSequenceNumber + 1, " to ", receivedSeqn - 1);
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// save message and wait for missing message again
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SavePacket (packet);
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}
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}
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}
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void Stream::SavePacket (Packet * packet)
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{
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m_SavedPackets.insert (packet);
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}
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void Stream::ProcessPacket (Packet * packet)
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{
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// process flags
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uint32_t receivedSeqn = packet->GetSeqn ();
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uint16_t flags = packet->GetFlags ();
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LogPrint ("Process seqn=", receivedSeqn, ", flags=", flags);
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const uint8_t * optionData = packet->GetOptionData ();
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if (flags & PACKET_FLAG_SYNCHRONIZE)
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{
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LogPrint ("Synchronize");
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}
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if (flags & PACKET_FLAG_DELAY_REQUESTED)
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{
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optionData += 2;
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}
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if (flags & PACKET_FLAG_FROM_INCLUDED)
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{
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optionData += m_RemoteIdentity.FromBuffer (optionData, i2p::data::DEFAULT_IDENTITY_SIZE);
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LogPrint ("From identity ", m_RemoteIdentity.Hash ().ToBase64 ());
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if (!m_RemoteLeaseSet)
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LogPrint ("Incoming stream from ", m_RemoteIdentity.Hash ().ToBase64 ());
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}
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if (flags & PACKET_FLAG_MAX_PACKET_SIZE_INCLUDED)
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{
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uint16_t maxPacketSize = be16toh (*(uint16_t *)optionData);
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LogPrint ("Max packet size ", maxPacketSize);
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optionData += 2;
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}
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if (flags & PACKET_FLAG_SIGNATURE_INCLUDED)
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{
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LogPrint ("Signature");
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optionData += 40;
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}
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packet->offset = packet->GetPayload () - packet->buf;
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if (packet->GetLength () > 0)
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{
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m_ReceiveQueue.push (packet);
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m_ReceiveTimer.cancel ();
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}
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else
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delete packet;
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m_LastReceivedSequenceNumber = receivedSeqn;
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if (flags & PACKET_FLAG_CLOSE)
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{
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LogPrint ("Closed");
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SendQuickAck (); // send ack for close explicitly?
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m_IsOpen = false;
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m_ReceiveTimer.cancel ();
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m_ResendTimer.cancel ();
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}
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}
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void Stream::ProcessAck (Packet * packet)
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{
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uint32_t ackThrough = packet->GetAckThrough ();
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int nackCount = packet->GetNACKCount ();
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for (auto it = m_SentPackets.begin (); it != m_SentPackets.end ();)
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{
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auto seqn = (*it)->GetSeqn ();
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if (seqn <= ackThrough)
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{
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if (nackCount > 0)
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{
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bool nacked = false;
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for (int i = 0; i < nackCount; i++)
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if (seqn == packet->GetNACK (i))
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{
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nacked = true;
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break;
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}
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if (nacked)
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{
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LogPrint ("Packet ", seqn, " NACK");
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it++;
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continue;
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}
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}
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auto sentPacket = *it;
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LogPrint ("Packet ", seqn, " acknowledged");
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m_SentPackets.erase (it++);
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delete sentPacket;
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}
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else
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break;
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}
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if (m_SentPackets.empty ())
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m_ResendTimer.cancel ();
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}
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size_t Stream::Send (const uint8_t * buf, size_t len, int timeout)
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{
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bool isNoAck = m_LastReceivedSequenceNumber < 0; // first packet
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while (!m_IsOpen || len > 0)
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{
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Packet * p = new Packet ();
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uint8_t * packet = p->GetBuffer ();
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// TODO: implement setters
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size_t size = 0;
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*(uint32_t *)(packet + size) = htobe32 (m_SendStreamID);
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size += 4; // sendStreamID
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*(uint32_t *)(packet + size) = htobe32 (m_RecvStreamID);
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size += 4; // receiveStreamID
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*(uint32_t *)(packet + size) = htobe32 (m_SequenceNumber++);
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size += 4; // sequenceNum
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if (isNoAck)
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*(uint32_t *)(packet + size) = htobe32 (m_LastReceivedSequenceNumber);
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else
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*(uint32_t *)(packet + size) = 0;
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size += 4; // ack Through
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packet[size] = 0;
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size++; // NACK count
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size++; // resend delay
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if (!m_IsOpen)
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{
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// initial packet
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m_IsOpen = true;
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uint16_t flags = PACKET_FLAG_SYNCHRONIZE | PACKET_FLAG_FROM_INCLUDED |
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PACKET_FLAG_SIGNATURE_INCLUDED | PACKET_FLAG_MAX_PACKET_SIZE_INCLUDED;
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if (isNoAck) flags |= PACKET_FLAG_NO_ACK;
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*(uint16_t *)(packet + size) = htobe16 (flags);
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size += 2; // flags
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*(uint16_t *)(packet + size) = htobe16 (i2p::data::DEFAULT_IDENTITY_SIZE + 40 + 2); // identity + signature + packet size
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size += 2; // options size
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memcpy (packet + size, &m_LocalDestination->GetIdentity (), i2p::data::DEFAULT_IDENTITY_SIZE);
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size += i2p::data::DEFAULT_IDENTITY_SIZE; // from
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*(uint16_t *)(packet + size) = htobe16 (STREAMING_MTU);
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size += 2; // max packet size
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uint8_t * signature = packet + size; // set it later
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memset (signature, 0, 40); // zeroes for now
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size += 40; // signature
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size_t sentLen = STREAMING_MTU - size;
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if (len < sentLen) sentLen = len;
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memcpy (packet + size, buf, sentLen);
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buf += sentLen;
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len -= sentLen;
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size += sentLen; // payload
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m_LocalDestination->Sign (packet, size, signature);
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}
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else
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{
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// follow on packet
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*(uint16_t *)(packet + size) = 0;
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size += 2; // flags
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*(uint16_t *)(packet + size) = 0; // no options
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size += 2; // options size
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size_t sentLen = STREAMING_MTU - size;
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if (len < sentLen) sentLen = len;
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memcpy (packet + size, buf, sentLen);
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buf += sentLen;
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len -= sentLen;
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size += sentLen; // payload
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}
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p->len = size;
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m_Service.post (boost::bind (&Stream::SendPacket, this, p));
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}
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return len;
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}
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void Stream::SendQuickAck ()
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{
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Packet p;
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uint8_t * packet = p.GetBuffer ();
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size_t size = 0;
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*(uint32_t *)(packet + size) = htobe32 (m_SendStreamID);
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size += 4; // sendStreamID
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*(uint32_t *)(packet + size) = htobe32 (m_RecvStreamID);
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size += 4; // receiveStreamID
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*(uint32_t *)(packet + size) = 0; // this is plain Ack message
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size += 4; // sequenceNum
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*(uint32_t *)(packet + size) = htobe32 (m_LastReceivedSequenceNumber);
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size += 4; // ack Through
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packet[size] = 0;
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size++; // NACK count
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size++; // resend delay
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*(uint16_t *)(packet + size) = 0; // nof flags set
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size += 2; // flags
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*(uint16_t *)(packet + size) = 0; // no options
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size += 2; // options size
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p.len = size;
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SendPackets (std::vector<Packet *> { &p });
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LogPrint ("Quick Ack sent");
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}
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void Stream::Close ()
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{
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if (m_IsOpen)
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{
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m_IsOpen = false;
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Packet * p = new Packet ();
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uint8_t * packet = p->GetBuffer ();
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size_t size = 0;
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*(uint32_t *)(packet + size) = htobe32 (m_SendStreamID);
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size += 4; // sendStreamID
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*(uint32_t *)(packet + size) = htobe32 (m_RecvStreamID);
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size += 4; // receiveStreamID
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*(uint32_t *)(packet + size) = htobe32 (m_SequenceNumber++);
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size += 4; // sequenceNum
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*(uint32_t *)(packet + size) = htobe32 (m_LastReceivedSequenceNumber);
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size += 4; // ack Through
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packet[size] = 0;
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size++; // NACK count
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size++; // resend delay
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*(uint16_t *)(packet + size) = htobe16 (PACKET_FLAG_CLOSE | PACKET_FLAG_SIGNATURE_INCLUDED);
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size += 2; // flags
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*(uint16_t *)(packet + size) = htobe16 (40); // 40 bytes signature
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size += 2; // options size
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uint8_t * signature = packet + size;
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memset (packet + size, 0, 40);
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size += 40; // signature
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m_LocalDestination->Sign (packet, size, signature);
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p->len = size;
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m_Service.post (boost::bind (&Stream::SendPacket, this, p));
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LogPrint ("FIN sent");
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}
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}
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size_t Stream::ConcatenatePackets (uint8_t * buf, size_t len)
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{
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size_t pos = 0;
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while (pos < len && !m_ReceiveQueue.empty ())
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{
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Packet * packet = m_ReceiveQueue.front ();
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size_t l = std::min (packet->GetLength (), len - pos);
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memcpy (buf + pos, packet->GetBuffer (), l);
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pos += l;
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packet->offset += l;
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if (!packet->GetLength ())
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{
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m_ReceiveQueue.pop ();
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delete packet;
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}
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}
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return pos;
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}
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bool Stream::SendPacket (Packet * packet)
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{
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if (packet)
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{
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SendPackets (std::vector<Packet *> { packet });
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bool isEmpty = m_SentPackets.empty ();
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m_SentPackets.insert (packet);
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if (isEmpty)
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ScheduleResend ();
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return true;
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}
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else
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return false;
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}
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void Stream::SendPackets (const std::vector<Packet *>& packets)
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{
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if (!m_RemoteLeaseSet)
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{
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UpdateCurrentRemoteLease ();
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if (!m_RemoteLeaseSet)
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{
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LogPrint ("Can't send packets. Missing remote LeaseSet");
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return;
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}
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}
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const i2p::data::LeaseSet * leaseSet = nullptr;
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if (m_LeaseSetUpdated)
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{
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leaseSet = m_LocalDestination->GetLeaseSet ();
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m_LeaseSetUpdated = false;
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}
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m_CurrentOutboundTunnel = m_LocalDestination->GetTunnelPool ()->GetNextOutboundTunnel (m_CurrentOutboundTunnel);
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if (m_CurrentOutboundTunnel)
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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if (ts >= m_CurrentRemoteLease.endDate)
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UpdateCurrentRemoteLease ();
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if (ts < m_CurrentRemoteLease.endDate)
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{
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std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
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for (auto it: packets)
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{
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auto msg = i2p::garlic::routing.WrapMessage (*m_RemoteLeaseSet,
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CreateDataMessage (this, it->GetBuffer (), it->GetLength ()), leaseSet);
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msgs.push_back (i2p::tunnel::TunnelMessageBlock
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{
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i2p::tunnel::eDeliveryTypeTunnel,
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m_CurrentRemoteLease.tunnelGateway, m_CurrentRemoteLease.tunnelID,
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msg
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});
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leaseSet = nullptr; // send leaseSet only one time
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}
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m_CurrentOutboundTunnel->SendTunnelDataMsg (msgs);
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}
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else
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LogPrint ("All leases are expired");
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}
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else
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LogPrint ("No outbound tunnels in the pool");
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}
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void Stream::ScheduleResend ()
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{
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m_ResendTimer.cancel ();
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m_ResendTimer.expires_from_now (boost::posix_time::seconds(RESEND_TIMEOUT));
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m_ResendTimer.async_wait (boost::bind (&Stream::HandleResendTimer,
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this, boost::asio::placeholders::error));
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}
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void Stream::HandleResendTimer (const boost::system::error_code& ecode)
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{
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if (ecode != boost::asio::error::operation_aborted)
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{
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std::vector<Packet *> packets;
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for (auto it : m_SentPackets)
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{
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it->numResendAttempts++;
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if (it->numResendAttempts <= MAX_NUM_RESEND_ATTEMPTS)
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packets.push_back (it);
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else
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{
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Close ();
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m_ReceiveTimer.cancel ();
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return;
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}
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}
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if (packets.size () > 0)
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{
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m_CurrentOutboundTunnel = nullptr; // pick another outbound tunnel
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UpdateCurrentRemoteLease (); // pick another lease
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SendPackets (packets);
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}
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ScheduleResend ();
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}
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}
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void Stream::UpdateCurrentRemoteLease ()
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{
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if (!m_RemoteLeaseSet)
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{
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m_RemoteLeaseSet = i2p::data::netdb.FindLeaseSet (m_RemoteIdentity.Hash ());
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if (!m_RemoteLeaseSet)
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LogPrint ("LeaseSet ", m_RemoteIdentity.Hash ().ToBase64 (), " not found");
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}
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if (m_RemoteLeaseSet)
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{
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auto leases = m_RemoteLeaseSet->GetNonExpiredLeases ();
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if (!leases.empty ())
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{
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uint32_t i = i2p::context.GetRandomNumberGenerator ().GenerateWord32 (0, leases.size () - 1);
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m_CurrentRemoteLease = leases[i];
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}
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else
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m_CurrentRemoteLease.endDate = 0;
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}
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else
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m_CurrentRemoteLease.endDate = 0;
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}
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StreamingDestination::StreamingDestination (boost::asio::io_service& service):
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m_Service (service), m_LeaseSet (nullptr), m_IsPublic (false)
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{
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m_Keys = i2p::data::CreateRandomKeys ();
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m_IdentHash = m_Keys.pub.Hash ();
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m_SigningPrivateKey.Initialize (i2p::crypto::dsap, i2p::crypto::dsaq, i2p::crypto::dsag,
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CryptoPP::Integer (m_Keys.signingPrivateKey, 20));
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CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
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dh.GenerateKeyPair(i2p::context.GetRandomNumberGenerator (), m_EncryptionPrivateKey, m_EncryptionPublicKey);
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m_Pool = i2p::tunnel::tunnels.CreateTunnelPool (*this, 3); // 3-hops tunnel
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}
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|
|
|
StreamingDestination::StreamingDestination (boost::asio::io_service& service, const std::string& fullPath):
|
|
m_Service (service), m_LeaseSet (nullptr), m_IsPublic (true)
|
|
{
|
|
std::ifstream s(fullPath.c_str (), std::ifstream::binary);
|
|
if (s.is_open ())
|
|
s.read ((char *)&m_Keys, sizeof (m_Keys));
|
|
else
|
|
LogPrint ("Can't open file ", fullPath);
|
|
|
|
m_IdentHash = m_Keys.pub.Hash ();
|
|
m_SigningPrivateKey.Initialize (i2p::crypto::dsap, i2p::crypto::dsaq, i2p::crypto::dsag,
|
|
CryptoPP::Integer (m_Keys.signingPrivateKey, 20));
|
|
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 ()
|
|
{
|
|
if (m_Pool)
|
|
i2p::tunnel::tunnels.DeleteTunnelPool (m_Pool);
|
|
delete m_LeaseSet;
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
Stream * StreamingDestination::CreateNewOutgoingStream (const i2p::data::LeaseSet& remote)
|
|
{
|
|
Stream * s = new Stream (m_Service, this, remote);
|
|
m_Streams[s->GetRecvStreamID ()] = s;
|
|
return s;
|
|
}
|
|
|
|
Stream * StreamingDestination::CreateNewIncomingStream ()
|
|
{
|
|
Stream * s = new Stream (m_Service, this);
|
|
m_Streams[s->GetRecvStreamID ()] = s;
|
|
return s;
|
|
}
|
|
|
|
void StreamingDestination::DeleteStream (Stream * stream)
|
|
{
|
|
if (stream)
|
|
{
|
|
m_Streams.erase (stream->GetRecvStreamID ());
|
|
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::SetLeaseSetUpdated ()
|
|
{
|
|
UpdateLeaseSet ();
|
|
for (auto it: m_Streams)
|
|
it.second->SetLeaseSetUpdated ();
|
|
if (m_IsPublic)
|
|
i2p::data::netdb.PublishLeaseSet (m_LeaseSet, m_Pool);
|
|
}
|
|
|
|
void StreamingDestination::Sign (const uint8_t * buf, int len, uint8_t * signature) const
|
|
{
|
|
CryptoPP::DSA::Signer signer (m_SigningPrivateKey);
|
|
signer.SignMessage (i2p::context.GetRandomNumberGenerator (), buf, len, signature);
|
|
}
|
|
|
|
StreamingDestinations destinations;
|
|
void StreamingDestinations::Start ()
|
|
{
|
|
if (!m_SharedLocalDestination)
|
|
{
|
|
m_SharedLocalDestination = new StreamingDestination (m_Service);
|
|
m_Destinations[m_SharedLocalDestination->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);
|
|
m_Destinations[localDestination->GetIdentHash ()] = localDestination;
|
|
numDestinations++;
|
|
}
|
|
}
|
|
if (numDestinations > 0)
|
|
LogPrint (numDestinations, " local destinations loaded");
|
|
}
|
|
|
|
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)
|
|
{
|
|
m_Service.post (
|
|
[=](void)
|
|
{
|
|
stream->GetLocalDestination ()->DeleteStream (stream);
|
|
}
|
|
);
|
|
}
|
|
}
|
|
|
|
void StreamingDestinations::HandleNextPacket (i2p::data::IdentHash destination, Packet * packet)
|
|
{
|
|
m_Service.post (boost::bind (&StreamingDestinations::PostNextPacket, this, destination, packet));
|
|
}
|
|
|
|
void StreamingDestinations::PostNextPacket (i2p::data::IdentHash destination, Packet * packet)
|
|
{
|
|
auto it = m_Destinations.find (destination);
|
|
if (it != m_Destinations.end ())
|
|
it->second->HandleNextPacket (packet);
|
|
else
|
|
{
|
|
LogPrint ("Local destination ", destination.ToBase64 (), " not found");
|
|
delete packet;
|
|
}
|
|
}
|
|
|
|
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 ();
|
|
}
|
|
|
|
void HandleDataMessage (i2p::data::IdentHash destination, 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 engine thread
|
|
destinations.HandleNextPacket (destination, uncompressed);
|
|
}
|
|
else
|
|
LogPrint ("Data: protocol ", buf[9], " is not supported");
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|