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513 lines
14 KiB
C++
513 lines
14 KiB
C++
#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 "Destination.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), m_RemoteLeaseSet (&remote),
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m_RoutingSession (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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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_RoutingSession (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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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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m_ReceiveTimer.cancel ();
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for (auto it: m_SentPackets)
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delete it;
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m_SentPackets.clear ();
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m_ResendTimer.cancel ();
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for (auto it: m_SavedPackets)
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delete it;
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m_SavedPackets.clear ();
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Close ();
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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); // 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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LogPrint ("Synchronize");
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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, packet->GetOptionSize ());
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LogPrint ("From identity ", m_RemoteIdentity.GetIdentHash ().ToBase64 ());
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if (!m_RemoteLeaseSet)
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LogPrint ("Incoming stream from ", m_RemoteIdentity.GetIdentHash ().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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uint8_t signature[256];
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auto signatureLen = m_RemoteIdentity.GetSignatureLen ();
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memcpy (signature, optionData, signatureLen);
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memset (const_cast<uint8_t *>(optionData), 0, signatureLen);
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if (!m_RemoteIdentity.Verify (packet->GetBuffer (), packet->GetLength (), signature))
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{
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LogPrint ("Signature verification failed");
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Close ();
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flags |= PACKET_FLAG_CLOSE;
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}
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memcpy (const_cast<uint8_t *>(optionData), signature, signatureLen);
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optionData += signatureLen;
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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)
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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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size_t identityLen = m_LocalDestination->GetIdentity ().GetFullLen ();
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size_t signatureLen = m_LocalDestination->GetIdentity ().GetSignatureLen ();
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*(uint16_t *)(packet + size) = htobe16 (identityLen + signatureLen + 2); // identity + signature + packet size
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size += 2; // options size
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m_LocalDestination->GetIdentity ().ToBuffer (packet + size, identityLen);
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size += identityLen; // 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, signatureLen); // zeroes for now
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size += signatureLen; // 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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size_t signatureLen = m_LocalDestination->GetIdentity ().GetSignatureLen ();
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*(uint16_t *)(packet + size) = htobe16 (signatureLen); // signature only
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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, signatureLen);
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size += signatureLen; // signature
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m_LocalDestination->Sign (packet, size, signature);
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p->len = size;
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SendPacket (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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if (m_IsOpen)
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{
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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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}
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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 = m_RoutingSession->WrapSingleMessage (
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CreateDataMessage (this, it->GetBuffer (), it->GetLength ()),
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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.GetIdentHash ());
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if (!m_RemoteLeaseSet)
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LogPrint ("LeaseSet ", m_RemoteIdentity.GetIdentHash ().ToBase64 (), " not found");
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}
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if (m_RemoteLeaseSet)
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{
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if (!m_RoutingSession)
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m_RoutingSession = i2p::garlic::routing.GetRoutingSession (*m_RemoteLeaseSet, 32);
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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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}
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}
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