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394 lines
13 KiB
C++
394 lines
13 KiB
C++
/*
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* Copyright (c) 2013-2020, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#include <string.h>
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#include "Crypto.h"
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#include "Log.h"
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#include "TunnelBase.h"
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#include "RouterContext.h"
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#include "Destination.h"
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#include "Datagram.h"
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namespace i2p
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{
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namespace datagram
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{
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DatagramDestination::DatagramDestination (std::shared_ptr<i2p::client::ClientDestination> owner, bool gzip):
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m_Owner (owner), m_Receiver (nullptr), m_RawReceiver (nullptr), m_Gzip (gzip)
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{
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auto identityLen = m_Owner->GetIdentity ()->GetFullLen ();
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m_From.resize (identityLen);
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m_Owner->GetIdentity ()->ToBuffer (m_From.data (), identityLen);
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m_Signature.resize (m_Owner->GetIdentity ()->GetSignatureLen ());
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}
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DatagramDestination::~DatagramDestination ()
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{
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m_Sessions.clear();
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}
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void DatagramDestination::SendDatagramTo(const uint8_t * payload, size_t len, const i2p::data::IdentHash & identity, uint16_t fromPort, uint16_t toPort)
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{
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if (m_Owner->GetIdentity ()->GetSigningKeyType () == i2p::data::SIGNING_KEY_TYPE_DSA_SHA1)
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{
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uint8_t hash[32];
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SHA256(payload, len, hash);
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m_Owner->Sign (hash, 32, m_Signature.data ());
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}
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else
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m_Owner->Sign (payload, len, m_Signature.data ());
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auto session = ObtainSession(identity);
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auto msg = CreateDataMessage ({{m_From.data (), m_From.size ()}, {m_Signature.data (), m_Signature.size ()}, {payload, len}},
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fromPort, toPort, false, !session->IsRatchets ()); // datagram
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session->SendMsg(msg);
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}
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void DatagramDestination::SendRawDatagramTo(const uint8_t * payload, size_t len, const i2p::data::IdentHash & identity, uint16_t fromPort, uint16_t toPort)
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{
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auto session = ObtainSession(identity);
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auto msg = CreateDataMessage ({{payload, len}}, fromPort, toPort, true, !session->IsRatchets ()); // raw
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session->SendMsg(msg);
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}
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void DatagramDestination::HandleDatagram (uint16_t fromPort, uint16_t toPort,uint8_t * const &buf, size_t len)
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{
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i2p::data::IdentityEx identity;
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size_t identityLen = identity.FromBuffer (buf, len);
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const uint8_t * signature = buf + identityLen;
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size_t headerLen = identityLen + identity.GetSignatureLen ();
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bool verified = false;
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if (identity.GetSigningKeyType () == i2p::data::SIGNING_KEY_TYPE_DSA_SHA1)
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{
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uint8_t hash[32];
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SHA256(buf + headerLen, len - headerLen, hash);
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verified = identity.Verify (hash, 32, signature);
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}
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else
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verified = identity.Verify (buf + headerLen, len - headerLen, signature);
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if (verified)
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{
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auto h = identity.GetIdentHash();
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auto session = ObtainSession(h);
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session->Ack();
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auto r = FindReceiver(toPort);
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if(r)
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r(identity, fromPort, toPort, buf + headerLen, len -headerLen);
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else
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LogPrint (eLogWarning, "DatagramDestination: no receiver for port ", toPort);
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}
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else
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LogPrint (eLogWarning, "Datagram signature verification failed");
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}
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void DatagramDestination::HandleRawDatagram (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len)
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{
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if (m_RawReceiver)
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m_RawReceiver (fromPort, toPort, buf, len);
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else
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LogPrint (eLogWarning, "DatagramDestination: no receiver for raw datagram");
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}
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DatagramDestination::Receiver DatagramDestination::FindReceiver(uint16_t port)
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{
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std::lock_guard<std::mutex> lock(m_ReceiversMutex);
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Receiver r = m_Receiver;
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auto itr = m_ReceiversByPorts.find(port);
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if (itr != m_ReceiversByPorts.end())
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r = itr->second;
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return r;
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}
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void DatagramDestination::HandleDataMessagePayload (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len, bool isRaw)
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{
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// unzip it
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uint8_t uncompressed[MAX_DATAGRAM_SIZE];
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size_t uncompressedLen = m_Inflator.Inflate (buf, len, uncompressed, MAX_DATAGRAM_SIZE);
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if (uncompressedLen)
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{
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if (isRaw)
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HandleRawDatagram (fromPort, toPort, uncompressed, uncompressedLen);
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else
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HandleDatagram (fromPort, toPort, uncompressed, uncompressedLen);
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}
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else
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LogPrint (eLogWarning, "Datagram: decompression failed");
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}
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std::shared_ptr<I2NPMessage> DatagramDestination::CreateDataMessage (
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const std::vector<std::pair<const uint8_t *, size_t> >& payloads,
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uint16_t fromPort, uint16_t toPort, bool isRaw, bool checksum)
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{
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auto msg = NewI2NPMessage ();
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uint8_t * buf = msg->GetPayload ();
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buf += 4; // reserve for length
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size_t size = m_Gzip ? m_Deflator.Deflate (payloads, buf, msg->maxLen - msg->len) :
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i2p::data::GzipNoCompression (payloads, buf, msg->maxLen - msg->len);
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if (size)
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{
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htobe32buf (msg->GetPayload (), size); // length
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htobe16buf (buf + 4, fromPort); // source port
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htobe16buf (buf + 6, toPort); // destination port
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buf[9] = isRaw ? i2p::client::PROTOCOL_TYPE_RAW : i2p::client::PROTOCOL_TYPE_DATAGRAM; // raw or datagram protocol
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msg->len += size + 4;
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msg->FillI2NPMessageHeader (eI2NPData, 0, checksum);
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}
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else
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msg = nullptr;
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return msg;
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}
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void DatagramDestination::CleanUp ()
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{
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if (m_Sessions.empty ()) return;
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auto now = i2p::util::GetMillisecondsSinceEpoch();
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LogPrint(eLogDebug, "DatagramDestination: clean up sessions");
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std::unique_lock<std::mutex> lock(m_SessionsMutex);
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// for each session ...
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for (auto it = m_Sessions.begin (); it != m_Sessions.end (); )
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{
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// check if expired
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if (now - it->second->LastActivity() >= DATAGRAM_SESSION_MAX_IDLE)
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{
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LogPrint(eLogInfo, "DatagramDestination: expiring idle session with ", it->first.ToBase32());
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it->second->Stop ();
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it = m_Sessions.erase (it); // we are expired
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}
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else
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it++;
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}
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}
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std::shared_ptr<DatagramSession> DatagramDestination::ObtainSession(const i2p::data::IdentHash & identity)
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{
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std::shared_ptr<DatagramSession> session = nullptr;
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std::lock_guard<std::mutex> lock(m_SessionsMutex);
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auto itr = m_Sessions.find(identity);
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if (itr == m_Sessions.end()) {
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// not found, create new session
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session = std::make_shared<DatagramSession>(m_Owner, identity);
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session->Start ();
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m_Sessions[identity] = session;
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} else {
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session = itr->second;
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}
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return session;
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}
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std::shared_ptr<DatagramSession::Info> DatagramDestination::GetInfoForRemote(const i2p::data::IdentHash & remote)
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{
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std::lock_guard<std::mutex> lock(m_SessionsMutex);
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for ( auto & item : m_Sessions)
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{
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if(item.first == remote) return std::make_shared<DatagramSession::Info>(item.second->GetSessionInfo());
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}
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return nullptr;
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}
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DatagramSession::DatagramSession(std::shared_ptr<i2p::client::ClientDestination> localDestination,
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const i2p::data::IdentHash & remoteIdent) :
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m_LocalDestination(localDestination),
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m_RemoteIdent(remoteIdent),
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m_SendQueueTimer(localDestination->GetService()),
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m_RequestingLS(false)
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{
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}
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void DatagramSession::Start ()
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{
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m_LastUse = i2p::util::GetMillisecondsSinceEpoch ();
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ScheduleFlushSendQueue();
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}
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void DatagramSession::Stop ()
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{
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m_SendQueueTimer.cancel ();
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}
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void DatagramSession::SendMsg(std::shared_ptr<I2NPMessage> msg)
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{
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// we used this session
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m_LastUse = i2p::util::GetMillisecondsSinceEpoch();
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// schedule send
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auto self = shared_from_this();
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m_LocalDestination->GetService().post(std::bind(&DatagramSession::HandleSend, self, msg));
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}
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DatagramSession::Info DatagramSession::GetSessionInfo() const
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{
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if(!m_RoutingSession)
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return DatagramSession::Info(nullptr, nullptr, m_LastUse);
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auto routingPath = m_RoutingSession->GetSharedRoutingPath();
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if (!routingPath)
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return DatagramSession::Info(nullptr, nullptr, m_LastUse);
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auto lease = routingPath->remoteLease;
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auto tunnel = routingPath->outboundTunnel;
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if(lease)
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{
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if(tunnel)
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return DatagramSession::Info(lease->tunnelGateway, tunnel->GetEndpointIdentHash(), m_LastUse);
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else
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return DatagramSession::Info(lease->tunnelGateway, nullptr, m_LastUse);
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}
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else if(tunnel)
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return DatagramSession::Info(nullptr, tunnel->GetEndpointIdentHash(), m_LastUse);
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else
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return DatagramSession::Info(nullptr, nullptr, m_LastUse);
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}
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void DatagramSession::Ack()
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{
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m_LastUse = i2p::util::GetMillisecondsSinceEpoch();
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auto path = GetSharedRoutingPath();
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if(path)
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path->updateTime = i2p::util::GetSecondsSinceEpoch ();
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if (IsRatchets ())
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SendMsg (nullptr); // send empty message in case if we have some data to send
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}
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std::shared_ptr<i2p::garlic::GarlicRoutingPath> DatagramSession::GetSharedRoutingPath ()
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{
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if(!m_RoutingSession) {
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if(!m_RemoteLeaseSet) {
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m_RemoteLeaseSet = m_LocalDestination->FindLeaseSet(m_RemoteIdent);
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}
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if(!m_RemoteLeaseSet) {
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// no remote lease set
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if(!m_RequestingLS) {
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m_RequestingLS = true;
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m_LocalDestination->RequestDestination(m_RemoteIdent, std::bind(&DatagramSession::HandleLeaseSetUpdated, this, std::placeholders::_1));
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}
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return nullptr;
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}
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m_RoutingSession = m_LocalDestination->GetRoutingSession(m_RemoteLeaseSet, true);
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}
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auto path = m_RoutingSession->GetSharedRoutingPath();
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if(path) {
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if (m_CurrentOutboundTunnel && !m_CurrentOutboundTunnel->IsEstablished()) {
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// bad outbound tunnel, switch outbound tunnel
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m_CurrentOutboundTunnel = m_LocalDestination->GetTunnelPool()->GetNextOutboundTunnel(m_CurrentOutboundTunnel);
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path->outboundTunnel = m_CurrentOutboundTunnel;
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}
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if(m_CurrentRemoteLease && m_CurrentRemoteLease->ExpiresWithin(DATAGRAM_SESSION_LEASE_HANDOVER_WINDOW)) {
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// bad lease, switch to next one
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if(m_RemoteLeaseSet && m_RemoteLeaseSet->IsExpired())
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m_RemoteLeaseSet = m_LocalDestination->FindLeaseSet(m_RemoteIdent);
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if(m_RemoteLeaseSet) {
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auto ls = m_RemoteLeaseSet->GetNonExpiredLeasesExcluding([&](const i2p::data::Lease& l) -> bool {
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return l.tunnelID == m_CurrentRemoteLease->tunnelID;
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});
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auto sz = ls.size();
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if (sz) {
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auto idx = rand() % sz;
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m_CurrentRemoteLease = ls[idx];
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}
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} else {
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// no remote lease set?
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LogPrint(eLogWarning, "DatagramSession: no cached remote lease set for ", m_RemoteIdent.ToBase32());
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}
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path->remoteLease = m_CurrentRemoteLease;
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}
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} else {
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// no current path, make one
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path = std::make_shared<i2p::garlic::GarlicRoutingPath>();
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// switch outbound tunnel if bad
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if(m_CurrentOutboundTunnel == nullptr || ! m_CurrentOutboundTunnel->IsEstablished()) {
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m_CurrentOutboundTunnel = m_LocalDestination->GetTunnelPool()->GetNextOutboundTunnel(m_CurrentOutboundTunnel);
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}
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// switch lease if bad
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if(m_CurrentRemoteLease && m_CurrentRemoteLease->ExpiresWithin(DATAGRAM_SESSION_LEASE_HANDOVER_WINDOW)) {
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if(!m_RemoteLeaseSet) {
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m_RemoteLeaseSet = m_LocalDestination->FindLeaseSet(m_RemoteIdent);
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}
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if(m_RemoteLeaseSet) {
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// pick random next good lease
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auto ls = m_RemoteLeaseSet->GetNonExpiredLeasesExcluding([&] (const i2p::data::Lease & l) -> bool {
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if(m_CurrentRemoteLease)
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return l.tunnelGateway == m_CurrentRemoteLease->tunnelGateway;
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return false;
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});
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auto sz = ls.size();
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if(sz) {
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auto idx = rand() % sz;
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m_CurrentRemoteLease = ls[idx];
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}
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} else {
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// no remote lease set currently, bail
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LogPrint(eLogWarning, "DatagramSession: no remote lease set found for ", m_RemoteIdent.ToBase32());
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return nullptr;
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}
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} else if (!m_CurrentRemoteLease) {
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if(!m_RemoteLeaseSet) m_RemoteLeaseSet = m_LocalDestination->FindLeaseSet(m_RemoteIdent);
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if (m_RemoteLeaseSet)
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{
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auto ls = m_RemoteLeaseSet->GetNonExpiredLeases();
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auto sz = ls.size();
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if (sz) {
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auto idx = rand() % sz;
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m_CurrentRemoteLease = ls[idx];
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}
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}
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}
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path->outboundTunnel = m_CurrentOutboundTunnel;
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path->remoteLease = m_CurrentRemoteLease;
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m_RoutingSession->SetSharedRoutingPath(path);
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}
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return path;
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}
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void DatagramSession::HandleLeaseSetUpdated(std::shared_ptr<i2p::data::LeaseSet> ls)
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{
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m_RequestingLS = false;
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if(!ls) return;
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// only update lease set if found and newer than previous lease set
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uint64_t oldExpire = 0;
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if(m_RemoteLeaseSet) oldExpire = m_RemoteLeaseSet->GetExpirationTime();
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if(ls && ls->GetExpirationTime() > oldExpire) m_RemoteLeaseSet = ls;
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}
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void DatagramSession::HandleSend(std::shared_ptr<I2NPMessage> msg)
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{
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if (msg || m_SendQueue.empty ())
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m_SendQueue.push_back(msg);
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// flush queue right away if full
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if(m_SendQueue.size() >= DATAGRAM_SEND_QUEUE_MAX_SIZE) FlushSendQueue();
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}
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void DatagramSession::FlushSendQueue ()
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{
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std::vector<i2p::tunnel::TunnelMessageBlock> send;
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auto routingPath = GetSharedRoutingPath();
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// if we don't have a routing path we will drop all queued messages
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if(routingPath && routingPath->outboundTunnel && routingPath->remoteLease)
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{
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for (const auto & msg : m_SendQueue)
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{
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auto m = m_RoutingSession->WrapSingleMessage(msg);
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if (m)
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send.push_back(i2p::tunnel::TunnelMessageBlock{i2p::tunnel::eDeliveryTypeTunnel,routingPath->remoteLease->tunnelGateway, routingPath->remoteLease->tunnelID, m});
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}
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routingPath->outboundTunnel->SendTunnelDataMsg(send);
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}
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m_SendQueue.clear();
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ScheduleFlushSendQueue();
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}
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void DatagramSession::ScheduleFlushSendQueue()
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{
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boost::posix_time::milliseconds dlt(10);
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m_SendQueueTimer.expires_from_now(dlt);
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auto self = shared_from_this();
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m_SendQueueTimer.async_wait([self](const boost::system::error_code & ec) { if(ec) return; self->FlushSendQueue(); });
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}
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}
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}
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