mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-17 15:25:35 +00:00
958 lines
28 KiB
C++
958 lines
28 KiB
C++
#include <iwp/session.hpp>
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#include <messages/link_intro.hpp>
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#include <messages/discard.hpp>
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#include <util/meta/memfn.hpp>
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namespace llarp
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{
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namespace iwp
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{
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ILinkSession::Packet_t
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CreatePacket(Command cmd, size_t plainsize, size_t minpad, size_t variance)
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{
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const size_t pad = minpad > 0 ? minpad + (variance > 0 ? randint() % variance : 0) : 0;
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ILinkSession::Packet_t pkt(PacketOverhead + plainsize + pad + CommandOverhead);
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// randomize pad
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if (pad)
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{
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CryptoManager::instance()->randbytes(
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pkt.data() + PacketOverhead + CommandOverhead + plainsize, pad);
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}
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// randomize nounce
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CryptoManager::instance()->randbytes(pkt.data() + HMACSIZE, TUNNONCESIZE);
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pkt[PacketOverhead] = LLARP_PROTO_VERSION;
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pkt[PacketOverhead + 1] = cmd;
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return pkt;
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}
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Session::Session(LinkLayer* p, const RouterContact& rc, const AddressInfo& ai)
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: m_State{State::Initial}
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, m_Inbound{false}
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, m_Parent(p)
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, m_CreatedAt{p->Now()}
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, m_RemoteAddr(ai.toIpAddress())
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, m_ChosenAI(ai)
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, m_RemoteRC(rc)
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{
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token.Zero();
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GotLIM = util::memFn(&Session::GotOutboundLIM, this);
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CryptoManager::instance()->shorthash(m_SessionKey, llarp_buffer_t(rc.pubkey));
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}
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Session::Session(LinkLayer* p, const IpAddress& from)
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: m_State{State::Initial}
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, m_Inbound{true}
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, m_Parent(p)
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, m_CreatedAt{p->Now()}
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, m_RemoteAddr(from)
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{
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token.Randomize();
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GotLIM = util::memFn(&Session::GotInboundLIM, this);
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const PubKey pk = m_Parent->GetOurRC().pubkey;
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CryptoManager::instance()->shorthash(m_SessionKey, llarp_buffer_t(pk));
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}
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void
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Session::Send_LL(const byte_t* buf, size_t sz)
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{
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LogDebug("send ", sz, " to ", m_RemoteAddr);
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const llarp_buffer_t pkt(buf, sz);
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m_Parent->SendTo_LL(m_RemoteAddr.createSockAddr(), pkt);
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m_LastTX = time_now_ms();
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m_TXRate += sz;
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}
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bool
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Session::GotInboundLIM(const LinkIntroMessage* msg)
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{
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if (msg->rc.pubkey != m_ExpectedIdent)
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{
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LogError(
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"ident key mismatch from ", m_RemoteAddr, " ", msg->rc.pubkey, " != ", m_ExpectedIdent);
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return false;
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}
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m_State = State::Ready;
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GotLIM = util::memFn(&Session::GotRenegLIM, this);
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m_RemoteRC = msg->rc;
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m_Parent->MapAddr(m_RemoteRC.pubkey, this);
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return m_Parent->SessionEstablished(this);
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}
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bool
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Session::GotOutboundLIM(const LinkIntroMessage* msg)
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{
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if (msg->rc.pubkey != m_RemoteRC.pubkey)
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{
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LogError("ident key mismatch");
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return false;
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}
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m_RemoteRC = msg->rc;
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GotLIM = util::memFn(&Session::GotRenegLIM, this);
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auto self = shared_from_this();
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assert(self.use_count() > 1);
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SendOurLIM([self](ILinkSession::DeliveryStatus st) {
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if (st == ILinkSession::DeliveryStatus::eDeliverySuccess)
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{
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self->m_State = State::Ready;
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self->m_Parent->MapAddr(self->m_RemoteRC.pubkey, self.get());
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self->m_Parent->SessionEstablished(self.get());
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}
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});
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return true;
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}
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void
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Session::SendOurLIM(ILinkSession::CompletionHandler h)
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{
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LinkIntroMessage msg;
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msg.rc = m_Parent->GetOurRC();
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msg.N.Randomize();
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msg.P = 60000;
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if (not msg.Sign(m_Parent->Sign))
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{
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LogError("failed to sign our RC for ", m_RemoteAddr);
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return;
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}
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ILinkSession::Message_t data(LinkIntroMessage::MaxSize + PacketOverhead);
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llarp_buffer_t buf(data);
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if (not msg.BEncode(&buf))
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{
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LogError("failed to encode LIM for ", m_RemoteAddr);
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}
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if (!SendMessageBuffer(std::move(data), h))
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{
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LogError("failed to send LIM to ", m_RemoteAddr);
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}
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LogDebug("sent LIM to ", m_RemoteAddr);
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}
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void
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Session::EncryptAndSend(ILinkSession::Packet_t data)
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{
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if (m_EncryptNext == nullptr)
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m_EncryptNext = std::make_shared<CryptoQueue_t>();
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m_EncryptNext->emplace_back(std::move(data));
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if (!IsEstablished())
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{
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EncryptWorker(std::move(m_EncryptNext));
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m_EncryptNext = nullptr;
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}
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}
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void
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Session::EncryptWorker(CryptoQueue_ptr msgs)
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{
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LogDebug("encrypt worker ", msgs->size(), " messages");
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for (auto& pkt : *msgs)
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{
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llarp_buffer_t pktbuf(pkt);
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const TunnelNonce nonce_ptr{pkt.data() + HMACSIZE};
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pktbuf.base += PacketOverhead;
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pktbuf.cur = pktbuf.base;
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pktbuf.sz -= PacketOverhead;
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CryptoManager::instance()->xchacha20(pktbuf, m_SessionKey, nonce_ptr);
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pktbuf.base = pkt.data() + HMACSIZE;
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pktbuf.sz = pkt.size() - HMACSIZE;
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CryptoManager::instance()->hmac(pkt.data(), pktbuf, m_SessionKey);
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Send_LL(pkt.data(), pkt.size());
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}
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}
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void
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Session::Close()
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{
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if (m_State == State::Closed)
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return;
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auto close_msg = CreatePacket(Command::eCLOS, 0, 16, 16);
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if (m_State == State::Ready)
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m_Parent->UnmapAddr(m_RemoteAddr);
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m_State = State::Closed;
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EncryptAndSend(std::move(close_msg));
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LogInfo("closing connection to ", m_RemoteAddr);
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}
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bool
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Session::SendMessageBuffer(
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ILinkSession::Message_t buf, ILinkSession::CompletionHandler completed)
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{
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if (m_TXMsgs.size() >= MaxSendQueueSize)
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return false;
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const auto now = m_Parent->Now();
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const auto msgid = m_TXID++;
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const auto bufsz = buf.size();
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auto& msg = m_TXMsgs.emplace(msgid, OutboundMessage{msgid, std::move(buf), now, completed})
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.first->second;
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EncryptAndSend(msg.XMIT());
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if (bufsz > FragmentSize)
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{
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msg.FlushUnAcked(util::memFn(&Session::EncryptAndSend, this), now);
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}
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m_Stats.totalInFlightTX++;
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LogDebug("send message ", msgid);
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return true;
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}
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void
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Session::SendMACK()
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{
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// send multi acks
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while (not m_SendMACKs.empty())
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{
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const auto sz = m_SendMACKs.size();
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const auto max = Session::MaxACKSInMACK;
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auto numAcks = std::min(sz, max);
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auto mack = CreatePacket(Command::eMACK, 1 + (numAcks * sizeof(uint64_t)));
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mack[PacketOverhead + CommandOverhead] = byte_t{static_cast<byte_t>(numAcks)};
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byte_t* ptr = mack.data() + 3 + PacketOverhead;
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LogDebug("send ", numAcks, " macks to ", m_RemoteAddr);
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const auto& itr = m_SendMACKs.top();
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while (numAcks > 0)
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{
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htobe64buf(ptr, itr);
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m_SendMACKs.pop();
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numAcks--;
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ptr += sizeof(uint64_t);
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}
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EncryptAndSend(std::move(mack));
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}
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}
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void
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Session::Pump()
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{
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const auto now = m_Parent->Now();
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if (m_State == State::Ready || m_State == State::LinkIntro)
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{
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if (ShouldPing())
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SendKeepAlive();
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for (auto& item : m_RXMsgs)
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{
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if (item.second.ShouldSendACKS(now))
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{
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item.second.SendACKS(util::memFn(&Session::EncryptAndSend, this), now);
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}
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}
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for (auto& item : m_TXMsgs)
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{
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if (item.second.ShouldFlush(now))
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{
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item.second.FlushUnAcked(util::memFn(&Session::EncryptAndSend, this), now);
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}
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}
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}
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auto self = shared_from_this();
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assert(self.use_count() > 1);
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if (m_EncryptNext && !m_EncryptNext->empty())
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{
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m_Parent->QueueWork([self, data = std::move(m_EncryptNext)] { self->EncryptWorker(data); });
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m_EncryptNext = nullptr;
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}
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if (m_DecryptNext && !m_DecryptNext->empty())
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{
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m_Parent->QueueWork([self, data = std::move(m_DecryptNext)] { self->DecryptWorker(data); });
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m_DecryptNext = nullptr;
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}
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}
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bool
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Session::GotRenegLIM(const LinkIntroMessage* lim)
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{
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LogDebug("renegotiate session on ", m_RemoteAddr);
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return m_Parent->SessionRenegotiate(lim->rc, m_RemoteRC);
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}
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bool
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Session::RenegotiateSession()
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{
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SendOurLIM();
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return true;
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}
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bool
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Session::ShouldPing() const
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{
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if (m_State == State::Ready)
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{
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const auto now = m_Parent->Now();
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return now - m_LastTX > PingInterval;
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}
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return false;
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}
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util::StatusObject
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Session::ExtractStatus() const
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{
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const auto now = m_Parent->Now();
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return {{"txRateCurrent", m_Stats.currentRateTX},
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{"rxRateCurrent", m_Stats.currentRateRX},
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{"rxPktsRcvd", m_Stats.totalPacketsRX},
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// leave 'tx' and 'rx' as duplicates of 'xRateCurrent' for compat
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{"tx", m_Stats.currentRateTX},
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{"rx", m_Stats.currentRateRX},
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{"txPktsAcked", m_Stats.totalAckedTX},
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{"txPktsDropped", m_Stats.totalDroppedTX},
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{"txPktsInFlight", m_Stats.totalInFlightTX},
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{"state", StateToString(m_State)},
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{"inbound", m_Inbound},
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{"replayFilter", m_ReplayFilter.size()},
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{"txMsgQueueSize", m_TXMsgs.size()},
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{"rxMsgQueueSize", m_RXMsgs.size()},
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{"remoteAddr", m_RemoteAddr.toString()},
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{"remoteRC", m_RemoteRC.ExtractStatus()},
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{"created", to_json(m_CreatedAt)},
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{"uptime", to_json(now - m_CreatedAt)}};
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}
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bool
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Session::TimedOut(llarp_time_t now) const
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{
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if (m_State == State::Ready || m_State == State::LinkIntro)
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{
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return now > m_LastRX && now - m_LastRX > SessionAliveTimeout;
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}
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return now - m_CreatedAt > SessionAliveTimeout;
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}
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bool
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Session::ShouldResetRates(llarp_time_t now) const
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{
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return now >= m_ResetRatesAt;
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}
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void
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Session::ResetRates()
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{
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m_Stats.currentRateTX = m_TXRate;
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m_Stats.currentRateRX = m_RXRate;
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m_RXRate = 0;
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m_TXRate = 0;
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}
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void
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Session::Tick(llarp_time_t now)
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{
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if (ShouldResetRates(now))
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{
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ResetRates();
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m_ResetRatesAt = now + 1s;
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}
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// remove pending outbound messsages that timed out
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// inform waiters
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{
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auto itr = m_TXMsgs.begin();
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while (itr != m_TXMsgs.end())
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{
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if (itr->second.IsTimedOut(now))
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{
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m_Stats.totalDroppedTX++;
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m_Stats.totalInFlightTX--;
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LogWarn("Dropped unacked packet to ", m_RemoteAddr);
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itr->second.InformTimeout();
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itr = m_TXMsgs.erase(itr);
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}
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else
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++itr;
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}
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}
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{
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// remove pending inbound messages that timed out
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auto itr = m_RXMsgs.begin();
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while (itr != m_RXMsgs.end())
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{
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if (itr->second.IsTimedOut(now))
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{
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m_ReplayFilter.emplace(itr->first, now);
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itr = m_RXMsgs.erase(itr);
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}
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else
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++itr;
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}
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}
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{
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// decay replay window
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auto itr = m_ReplayFilter.begin();
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while (itr != m_ReplayFilter.end())
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{
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if (itr->second + ReplayWindow <= now)
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{
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itr = m_ReplayFilter.erase(itr);
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}
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else
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++itr;
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}
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}
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}
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using Introduction =
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AlignedBuffer<PubKey::SIZE + PubKey::SIZE + TunnelNonce::SIZE + Signature::SIZE>;
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void
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Session::GenerateAndSendIntro()
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{
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TunnelNonce N;
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N.Randomize();
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{
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ILinkSession::Packet_t req(Introduction::SIZE + PacketOverhead);
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const auto pk = m_Parent->GetOurRC().pubkey;
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const auto e_pk = m_Parent->RouterEncryptionSecret().toPublic();
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auto itr = req.data() + PacketOverhead;
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std::copy_n(pk.data(), pk.size(), itr);
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itr += pk.size();
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std::copy_n(e_pk.data(), e_pk.size(), itr);
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itr += e_pk.size();
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std::copy_n(N.data(), N.size(), itr);
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Signature Z;
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llarp_buffer_t signbuf(req.data() + PacketOverhead, Introduction::SIZE - Signature::SIZE);
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m_Parent->Sign(Z, signbuf);
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std::copy_n(
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Z.data(),
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Z.size(),
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req.data() + PacketOverhead + (Introduction::SIZE - Signature::SIZE));
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CryptoManager::instance()->randbytes(req.data() + HMACSIZE, TUNNONCESIZE);
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EncryptAndSend(std::move(req));
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}
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m_State = State::Introduction;
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if (not CryptoManager::instance()->transport_dh_client(
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m_SessionKey, m_ChosenAI.pubkey, m_Parent->RouterEncryptionSecret(), N))
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{
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LogError("failed to transport_dh_client on outbound session to ", m_RemoteAddr);
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return;
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}
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LogDebug("sent intro to ", m_RemoteAddr);
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}
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void
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Session::HandleCreateSessionRequest(Packet_t pkt)
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{
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if (not DecryptMessageInPlace(pkt))
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{
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LogError("failed to decrypt session request from ", m_RemoteAddr);
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return;
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}
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if (pkt.size() < token.size() + PacketOverhead)
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{
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LogError(
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"bad session request size, ",
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pkt.size(),
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" < ",
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token.size() + PacketOverhead,
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" from ",
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m_RemoteAddr);
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return;
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}
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const auto begin = pkt.data() + PacketOverhead;
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if (not std::equal(begin, begin + token.size(), token.data()))
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{
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LogError("token mismatch from ", m_RemoteAddr);
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return;
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}
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m_LastRX = m_Parent->Now();
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m_State = State::LinkIntro;
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SendOurLIM();
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}
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void
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Session::HandleGotIntro(Packet_t pkt)
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{
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if (pkt.size() < (Introduction::SIZE + PacketOverhead))
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{
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LogWarn("intro too small from ", m_RemoteAddr);
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return;
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}
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byte_t* ptr = pkt.data() + PacketOverhead;
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TunnelNonce N;
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std::copy_n(ptr, PubKey::SIZE, m_ExpectedIdent.data());
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ptr += PubKey::SIZE;
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std::copy_n(ptr, PubKey::SIZE, m_RemoteOnionKey.data());
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ptr += PubKey::SIZE;
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std::copy_n(ptr, TunnelNonce::SIZE, N.data());
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ptr += TunnelNonce::SIZE;
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Signature Z;
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std::copy_n(ptr, Z.size(), Z.data());
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const llarp_buffer_t verifybuf(
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pkt.data() + PacketOverhead, Introduction::SIZE - Signature::SIZE);
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if (!CryptoManager::instance()->verify(m_ExpectedIdent, verifybuf, Z))
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{
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LogError("intro verify failed from ", m_RemoteAddr);
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return;
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}
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const PubKey pk = m_Parent->TransportSecretKey().toPublic();
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LogDebug(
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"got intro: remote-pk=",
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m_RemoteOnionKey.ToHex(),
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" N=",
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N.ToHex(),
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" local-pk=",
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pk.ToHex());
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if (not CryptoManager::instance()->transport_dh_server(
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m_SessionKey, m_RemoteOnionKey, m_Parent->TransportSecretKey(), N))
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{
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LogError("failed to transport_dh_server on inbound intro from ", m_RemoteAddr);
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return;
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}
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Packet_t reply(token.size() + PacketOverhead);
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// random nonce
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CryptoManager::instance()->randbytes(reply.data() + HMACSIZE, TUNNONCESIZE);
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// set token
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std::copy_n(token.data(), token.size(), reply.data() + PacketOverhead);
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m_LastRX = m_Parent->Now();
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EncryptAndSend(std::move(reply));
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LogDebug("sent intro ack to ", m_RemoteAddr);
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m_State = State::Introduction;
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}
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void
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Session::HandleGotIntroAck(Packet_t pkt)
|
|
{
|
|
if (pkt.size() < (token.size() + PacketOverhead))
|
|
{
|
|
LogError(
|
|
"bad intro ack size ",
|
|
pkt.size(),
|
|
" < ",
|
|
token.size() + PacketOverhead,
|
|
" from ",
|
|
m_RemoteAddr);
|
|
return;
|
|
}
|
|
Packet_t reply(token.size() + PacketOverhead);
|
|
if (not DecryptMessageInPlace(pkt))
|
|
{
|
|
LogError("intro ack decrypt failed from ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
m_LastRX = m_Parent->Now();
|
|
std::copy_n(pkt.data() + PacketOverhead, token.size(), token.data());
|
|
std::copy_n(token.data(), token.size(), reply.data() + PacketOverhead);
|
|
// random nounce
|
|
CryptoManager::instance()->randbytes(reply.data() + HMACSIZE, TUNNONCESIZE);
|
|
EncryptAndSend(std::move(reply));
|
|
LogDebug("sent session request to ", m_RemoteAddr);
|
|
m_State = State::LinkIntro;
|
|
}
|
|
|
|
bool
|
|
Session::DecryptMessageInPlace(Packet_t& pkt)
|
|
{
|
|
if (pkt.size() <= PacketOverhead)
|
|
{
|
|
LogError("packet too small from ", m_RemoteAddr);
|
|
return false;
|
|
}
|
|
const llarp_buffer_t buf(pkt);
|
|
ShortHash H;
|
|
llarp_buffer_t curbuf(buf.base, buf.sz);
|
|
curbuf.base += ShortHash::SIZE;
|
|
curbuf.sz -= ShortHash::SIZE;
|
|
if (not CryptoManager::instance()->hmac(H.data(), curbuf, m_SessionKey))
|
|
{
|
|
LogError("failed to caclulate keyed hash for ", m_RemoteAddr);
|
|
return false;
|
|
}
|
|
const ShortHash expected{buf.base};
|
|
if (H != expected)
|
|
{
|
|
LogError(
|
|
"keyed hash mismatch ",
|
|
H,
|
|
" != ",
|
|
expected,
|
|
" from ",
|
|
m_RemoteAddr,
|
|
" state=",
|
|
int(m_State),
|
|
" size=",
|
|
buf.sz);
|
|
return false;
|
|
}
|
|
const TunnelNonce N{curbuf.base};
|
|
curbuf.base += 32;
|
|
curbuf.sz -= 32;
|
|
LogDebug("decrypt: ", curbuf.sz, " bytes from ", m_RemoteAddr);
|
|
return CryptoManager::instance()->xchacha20(curbuf, m_SessionKey, N);
|
|
}
|
|
|
|
void
|
|
Session::Start()
|
|
{
|
|
if (m_Inbound)
|
|
return;
|
|
GenerateAndSendIntro();
|
|
}
|
|
|
|
void
|
|
Session::HandleSessionData(Packet_t pkt)
|
|
{
|
|
if (m_DecryptNext == nullptr)
|
|
m_DecryptNext = std::make_shared<CryptoQueue_t>();
|
|
m_DecryptNext->emplace_back(std::move(pkt));
|
|
}
|
|
|
|
void
|
|
Session::DecryptWorker(CryptoQueue_ptr msgs)
|
|
{
|
|
CryptoQueue_ptr recvMsgs = std::make_shared<CryptoQueue_t>();
|
|
for (auto& pkt : *msgs)
|
|
{
|
|
if (not DecryptMessageInPlace(pkt))
|
|
{
|
|
LogError("failed to decrypt session data from ", m_RemoteAddr);
|
|
continue;
|
|
}
|
|
if (pkt[PacketOverhead] != LLARP_PROTO_VERSION)
|
|
{
|
|
LogError(
|
|
"protocol version mismatch ", int(pkt[PacketOverhead]), " != ", LLARP_PROTO_VERSION);
|
|
continue;
|
|
}
|
|
recvMsgs->emplace_back(std::move(pkt));
|
|
}
|
|
LogDebug("decrypted ", recvMsgs->size(), " packets from ", m_RemoteAddr);
|
|
LogicCall(m_Parent->logic(), [self = shared_from_this(), msgs = recvMsgs] {
|
|
self->HandlePlaintext(std::move(msgs));
|
|
});
|
|
}
|
|
|
|
void
|
|
Session::HandlePlaintext(CryptoQueue_ptr msgs)
|
|
{
|
|
for (auto& result : *msgs)
|
|
{
|
|
LogDebug("Command ", int(result[PacketOverhead + 1]));
|
|
switch (result[PacketOverhead + 1])
|
|
{
|
|
case Command::eXMIT:
|
|
HandleXMIT(std::move(result));
|
|
break;
|
|
case Command::eDATA:
|
|
HandleDATA(std::move(result));
|
|
break;
|
|
case Command::eACKS:
|
|
HandleACKS(std::move(result));
|
|
break;
|
|
case Command::ePING:
|
|
HandlePING(std::move(result));
|
|
break;
|
|
case Command::eNACK:
|
|
HandleNACK(std::move(result));
|
|
break;
|
|
case Command::eCLOS:
|
|
HandleCLOS(std::move(result));
|
|
break;
|
|
case Command::eMACK:
|
|
HandleMACK(std::move(result));
|
|
break;
|
|
default:
|
|
LogError("invalid command ", int(result[PacketOverhead + 1]), " from ", m_RemoteAddr);
|
|
}
|
|
}
|
|
SendMACK();
|
|
Pump();
|
|
m_Parent->PumpDone();
|
|
}
|
|
|
|
void
|
|
Session::HandleMACK(Packet_t data)
|
|
{
|
|
if (data.size() < (3 + PacketOverhead))
|
|
{
|
|
LogError("impossibly short mack from ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
byte_t numAcks = data[CommandOverhead + PacketOverhead];
|
|
if (data.size() < 1 + CommandOverhead + PacketOverhead + (numAcks * sizeof(uint64_t)))
|
|
{
|
|
LogError("short mack from ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
LogDebug("got ", int(numAcks), " mack from ", m_RemoteAddr);
|
|
byte_t* ptr = data.data() + CommandOverhead + PacketOverhead + 1;
|
|
while (numAcks > 0)
|
|
{
|
|
uint64_t acked = bufbe64toh(ptr);
|
|
LogDebug("mack containing txid=", acked, " from ", m_RemoteAddr);
|
|
auto itr = m_TXMsgs.find(acked);
|
|
if (itr != m_TXMsgs.end())
|
|
{
|
|
m_Stats.totalAckedTX++;
|
|
m_Stats.totalInFlightTX--;
|
|
itr->second.Completed();
|
|
m_TXMsgs.erase(itr);
|
|
}
|
|
else
|
|
{
|
|
LogDebug("ignored mack for txid=", acked, " from ", m_RemoteAddr);
|
|
}
|
|
ptr += sizeof(uint64_t);
|
|
numAcks--;
|
|
}
|
|
}
|
|
|
|
void
|
|
Session::HandleNACK(Packet_t data)
|
|
{
|
|
if (data.size() < (CommandOverhead + sizeof(uint64_t) + PacketOverhead))
|
|
{
|
|
LogError("short nack from ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
uint64_t txid = bufbe64toh(data.data() + CommandOverhead + PacketOverhead);
|
|
LogDebug("got nack on ", txid, " from ", m_RemoteAddr);
|
|
auto itr = m_TXMsgs.find(txid);
|
|
if (itr != m_TXMsgs.end())
|
|
{
|
|
EncryptAndSend(itr->second.XMIT());
|
|
}
|
|
m_LastRX = m_Parent->Now();
|
|
}
|
|
|
|
void
|
|
Session::HandleXMIT(Packet_t data)
|
|
{
|
|
static constexpr size_t XMITOverhead =
|
|
(CommandOverhead + PacketOverhead + sizeof(uint16_t) + sizeof(uint64_t)
|
|
+ ShortHash::SIZE);
|
|
if (data.size() < XMITOverhead)
|
|
{
|
|
LogError("short XMIT from ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
uint16_t sz = bufbe16toh(data.data() + CommandOverhead + PacketOverhead);
|
|
uint64_t rxid = bufbe64toh(data.data() + CommandOverhead + sizeof(uint16_t) + PacketOverhead);
|
|
ShortHash h{data.data() + CommandOverhead + sizeof(uint16_t) + sizeof(uint64_t)
|
|
+ PacketOverhead};
|
|
LogDebug("rxid=", rxid, " sz=", sz, " h=", h.ToHex());
|
|
m_LastRX = m_Parent->Now();
|
|
{
|
|
// check for replay
|
|
auto itr = m_ReplayFilter.find(rxid);
|
|
if (itr != m_ReplayFilter.end())
|
|
{
|
|
m_SendMACKs.emplace(rxid);
|
|
LogDebug("duplicate rxid=", rxid, " from ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
}
|
|
{
|
|
const auto now = m_Parent->Now();
|
|
auto itr = m_RXMsgs.find(rxid);
|
|
if (itr == m_RXMsgs.end())
|
|
{
|
|
itr =
|
|
m_RXMsgs.emplace(rxid, InboundMessage{rxid, sz, std::move(h), m_Parent->Now()}).first;
|
|
sz = std::min(sz, uint16_t{FragmentSize});
|
|
if ((data.size() - XMITOverhead) == sz)
|
|
{
|
|
{
|
|
const llarp_buffer_t buf(data.data() + (data.size() - sz), sz);
|
|
itr->second.HandleData(0, buf, now);
|
|
if (not itr->second.IsCompleted())
|
|
{
|
|
return;
|
|
}
|
|
|
|
if (not itr->second.Verify())
|
|
{
|
|
LogError("bad short xmit hash from ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
}
|
|
auto msg = std::move(itr->second);
|
|
const llarp_buffer_t buf(msg.m_Data);
|
|
m_Parent->HandleMessage(this, buf);
|
|
if (m_ReplayFilter.emplace(rxid, m_Parent->Now()).second)
|
|
m_SendMACKs.emplace(rxid);
|
|
m_RXMsgs.erase(rxid);
|
|
}
|
|
}
|
|
else
|
|
LogDebug("got duplicate xmit on ", rxid, " from ", m_RemoteAddr);
|
|
}
|
|
}
|
|
|
|
void
|
|
Session::HandleDATA(Packet_t data)
|
|
{
|
|
if (data.size() < (CommandOverhead + sizeof(uint16_t) + sizeof(uint64_t) + PacketOverhead))
|
|
{
|
|
LogError("short DATA from ", m_RemoteAddr, " ", data.size());
|
|
return;
|
|
}
|
|
m_LastRX = m_Parent->Now();
|
|
uint16_t sz = bufbe16toh(data.data() + CommandOverhead + PacketOverhead);
|
|
uint64_t rxid = bufbe64toh(data.data() + CommandOverhead + sizeof(uint16_t) + PacketOverhead);
|
|
auto itr = m_RXMsgs.find(rxid);
|
|
if (itr == m_RXMsgs.end())
|
|
{
|
|
if (m_ReplayFilter.find(rxid) == m_ReplayFilter.end())
|
|
{
|
|
LogDebug("no rxid=", rxid, " for ", m_RemoteAddr);
|
|
auto nack = CreatePacket(Command::eNACK, 8);
|
|
htobe64buf(nack.data() + PacketOverhead + CommandOverhead, rxid);
|
|
EncryptAndSend(std::move(nack));
|
|
}
|
|
else
|
|
{
|
|
LogDebug("replay hit for rxid=", rxid, " for ", m_RemoteAddr);
|
|
m_SendMACKs.emplace(rxid);
|
|
}
|
|
return;
|
|
}
|
|
|
|
{
|
|
const llarp_buffer_t buf(
|
|
data.data() + PacketOverhead + 12, data.size() - (PacketOverhead + 12));
|
|
itr->second.HandleData(sz, buf, m_Parent->Now());
|
|
}
|
|
|
|
if (itr->second.IsCompleted())
|
|
{
|
|
if (itr->second.Verify())
|
|
{
|
|
auto msg = std::move(itr->second);
|
|
const llarp_buffer_t buf(msg.m_Data);
|
|
m_Parent->HandleMessage(this, buf);
|
|
if (m_ReplayFilter.emplace(itr->first, m_Parent->Now()).second)
|
|
m_SendMACKs.emplace(itr->first);
|
|
}
|
|
else
|
|
{
|
|
LogError("hash mismatch for message ", itr->first);
|
|
}
|
|
m_RXMsgs.erase(itr);
|
|
}
|
|
}
|
|
|
|
void
|
|
Session::HandleACKS(Packet_t data)
|
|
{
|
|
if (data.size() < (11 + PacketOverhead))
|
|
{
|
|
LogError("short ACKS from ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
const auto now = m_Parent->Now();
|
|
m_LastRX = now;
|
|
uint64_t txid = bufbe64toh(data.data() + 2 + PacketOverhead);
|
|
auto itr = m_TXMsgs.find(txid);
|
|
if (itr == m_TXMsgs.end())
|
|
{
|
|
LogDebug("no txid=", txid, " for ", m_RemoteAddr);
|
|
return;
|
|
}
|
|
itr->second.Ack(data[10 + PacketOverhead]);
|
|
|
|
if (itr->second.IsTransmitted())
|
|
{
|
|
LogDebug("sent message ", itr->first);
|
|
itr->second.Completed();
|
|
itr = m_TXMsgs.erase(itr);
|
|
}
|
|
else
|
|
{
|
|
itr->second.FlushUnAcked(util::memFn(&Session::EncryptAndSend, this), now);
|
|
}
|
|
}
|
|
|
|
void Session::HandleCLOS(Packet_t)
|
|
{
|
|
LogInfo("remote closed by ", m_RemoteAddr);
|
|
Close();
|
|
}
|
|
|
|
void Session::HandlePING(Packet_t)
|
|
{
|
|
m_LastRX = m_Parent->Now();
|
|
}
|
|
|
|
bool
|
|
Session::SendKeepAlive()
|
|
{
|
|
if (m_State == State::Ready)
|
|
{
|
|
EncryptAndSend(CreatePacket(Command::ePING, 0));
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
Session::IsEstablished() const
|
|
{
|
|
return m_State == State::Ready;
|
|
}
|
|
|
|
bool
|
|
Session::Recv_LL(ILinkSession::Packet_t data)
|
|
{
|
|
m_RXRate += data.size();
|
|
|
|
// TODO: differentiate between good and bad RX packets here
|
|
m_Stats.totalPacketsRX++;
|
|
switch (m_State)
|
|
{
|
|
case State::Initial:
|
|
if (m_Inbound)
|
|
{
|
|
// initial data
|
|
// enter introduction phase
|
|
if (DecryptMessageInPlace(data))
|
|
{
|
|
HandleGotIntro(std::move(data));
|
|
}
|
|
else
|
|
{
|
|
LogWarn("bad intro from ", m_RemoteAddr);
|
|
return false;
|
|
}
|
|
}
|
|
break;
|
|
case State::Introduction:
|
|
if (m_Inbound)
|
|
{
|
|
// we are replying to an intro ack
|
|
HandleCreateSessionRequest(std::move(data));
|
|
}
|
|
else
|
|
{
|
|
// we got an intro ack
|
|
// send a session request
|
|
HandleGotIntroAck(std::move(data));
|
|
}
|
|
break;
|
|
case State::LinkIntro:
|
|
default:
|
|
HandleSessionData(std::move(data));
|
|
break;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
std::string
|
|
Session::StateToString(State state)
|
|
{
|
|
switch (state)
|
|
{
|
|
case State::Initial:
|
|
return "Initial";
|
|
case State::Introduction:
|
|
return "Introduction";
|
|
case State::LinkIntro:
|
|
return "LinkIntro";
|
|
case State::Ready:
|
|
return "Ready";
|
|
case State::Closed:
|
|
return "Close";
|
|
default:
|
|
return "Invalid";
|
|
}
|
|
}
|
|
} // namespace iwp
|
|
} // namespace llarp
|