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592 lines
17 KiB
C++
592 lines
17 KiB
C++
#include <algorithm>
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#include <cassert>
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#include <boost/lexical_cast.hpp>
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#include "Log.h"
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#include "util.h"
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#include "ElGamal.h"
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#include "Timestamp.h"
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#include "NetDb.h"
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#include "Destination.h"
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namespace i2p
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{
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namespace client
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{
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ClientDestination::ClientDestination (const i2p::data::PrivateKeys& keys, bool isPublic,
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const std::map<std::string, std::string> * params):
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m_IsRunning (false), m_Thread (nullptr), m_Work (m_Service),
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m_Keys (keys), m_LeaseSet (nullptr), m_IsPublic (isPublic), m_PublishReplyToken (0),
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m_DatagramDestination (nullptr), m_PublishConfirmationTimer (m_Service), m_CleanupTimer (m_Service)
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{
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i2p::crypto::GenerateElGamalKeyPair(i2p::context.GetRandomNumberGenerator (), m_EncryptionPrivateKey, m_EncryptionPublicKey);
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int inboundTunnelLen = DEFAULT_INBOUND_TUNNEL_LENGTH;
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int outboundTunnelLen = DEFAULT_OUTBOUND_TUNNEL_LENGTH;
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if (params)
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{
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auto it = params->find (I2CP_PARAM_INBOUND_TUNNEL_LENGTH);
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if (it != params->end ())
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{
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int len = boost::lexical_cast<int>(it->second);
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if (len > 0)
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{
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inboundTunnelLen = len;
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LogPrint (eLogInfo, "Inbound tunnel length set to ", len);
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}
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}
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it = params->find (I2CP_PARAM_OUTBOUND_TUNNEL_LENGTH);
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if (it != params->end ())
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{
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int len = boost::lexical_cast<int>(it->second);
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if (len > 0)
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{
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outboundTunnelLen = len;
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LogPrint (eLogInfo, "Outbound tunnel length set to ", len);
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}
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}
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}
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m_Pool = i2p::tunnel::tunnels.CreateTunnelPool (this, inboundTunnelLen, outboundTunnelLen);
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if (m_IsPublic)
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LogPrint (eLogInfo, "Local address ", GetIdentHash().ToBase32 (), ".b32.i2p created");
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m_StreamingDestination = new i2p::stream::StreamingDestination (*this); // TODO:
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}
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ClientDestination::~ClientDestination ()
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{
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if (m_IsRunning)
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Stop ();
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for (auto it: m_LeaseSetRequests)
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delete it.second;
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if (m_Pool)
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i2p::tunnel::tunnels.DeleteTunnelPool (m_Pool);
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if (m_StreamingDestination)
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delete m_StreamingDestination;
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if (m_DatagramDestination)
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delete m_DatagramDestination;
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}
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void ClientDestination::Run ()
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{
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while (m_IsRunning)
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{
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try
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{
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m_Service.run ();
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}
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catch (std::exception& ex)
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{
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LogPrint ("Destination: ", ex.what ());
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}
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}
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}
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void ClientDestination::Start ()
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{
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if (!m_IsRunning)
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{
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m_IsRunning = true;
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m_Pool->SetLocalDestination (this);
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m_Pool->SetActive (true);
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m_Thread = new std::thread (std::bind (&ClientDestination::Run, this));
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m_StreamingDestination->Start ();
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m_CleanupTimer.expires_from_now (boost::posix_time::minutes (DESTINATION_CLEANUP_TIMEOUT));
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m_CleanupTimer.async_wait (std::bind (&ClientDestination::HandleCleanupTimer,
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this, std::placeholders::_1));
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}
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}
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void ClientDestination::Stop ()
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{
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if (m_IsRunning)
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{
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m_CleanupTimer.cancel ();
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m_IsRunning = false;
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m_StreamingDestination->Stop ();
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if (m_DatagramDestination)
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{
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auto d = m_DatagramDestination;
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m_DatagramDestination = nullptr;
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delete d;
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}
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if (m_Pool)
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{
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m_Pool->SetLocalDestination (nullptr);
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i2p::tunnel::tunnels.StopTunnelPool (m_Pool);
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}
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m_Service.stop ();
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if (m_Thread)
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{
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m_Thread->join ();
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delete m_Thread;
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m_Thread = 0;
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}
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}
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}
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std::shared_ptr<const i2p::data::LeaseSet> ClientDestination::FindLeaseSet (const i2p::data::IdentHash& ident)
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{
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auto it = m_RemoteLeaseSets.find (ident);
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if (it != m_RemoteLeaseSets.end ())
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{
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if (it->second->HasNonExpiredLeases ())
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return it->second;
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else
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LogPrint ("All leases of remote LeaseSet expired");
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}
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else
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{
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auto ls = i2p::data::netdb.FindLeaseSet (ident);
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if (ls)
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{
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m_RemoteLeaseSets[ident] = ls;
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return ls;
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}
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}
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return nullptr;
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}
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const i2p::data::LeaseSet * ClientDestination::GetLeaseSet ()
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{
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if (!m_Pool) return nullptr;
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if (!m_LeaseSet)
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UpdateLeaseSet ();
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return m_LeaseSet;
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}
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void ClientDestination::UpdateLeaseSet ()
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{
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auto newLeaseSet = new i2p::data::LeaseSet (*m_Pool);
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if (!m_LeaseSet)
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m_LeaseSet = newLeaseSet;
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else
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{
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// TODO: implement it better
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*m_LeaseSet = *newLeaseSet;
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delete newLeaseSet;
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}
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}
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bool ClientDestination::SubmitSessionKey (const uint8_t * key, const uint8_t * tag)
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{
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struct
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{
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uint8_t k[32], t[32];
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} data;
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memcpy (data.k, key, 32);
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memcpy (data.t, tag, 32);
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m_Service.post ([this,data](void)
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{
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this->AddSessionKey (data.k, data.t);
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});
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return true;
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}
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void ClientDestination::ProcessGarlicMessage (I2NPMessage * msg)
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{
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m_Service.post (std::bind (&ClientDestination::HandleGarlicMessage, this, msg));
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}
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void ClientDestination::ProcessDeliveryStatusMessage (I2NPMessage * msg)
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{
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m_Service.post (std::bind (&ClientDestination::HandleDeliveryStatusMessage, this, msg));
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}
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void ClientDestination::HandleI2NPMessage (const uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from)
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{
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uint8_t typeID = buf[I2NP_HEADER_TYPEID_OFFSET];
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switch (typeID)
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{
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case eI2NPData:
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HandleDataMessage (buf + I2NP_HEADER_SIZE, bufbe16toh (buf + I2NP_HEADER_SIZE_OFFSET));
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break;
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case eI2NPDatabaseStore:
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HandleDatabaseStoreMessage (buf + I2NP_HEADER_SIZE, bufbe16toh (buf + I2NP_HEADER_SIZE_OFFSET));
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break;
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case eI2NPDatabaseSearchReply:
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HandleDatabaseSearchReplyMessage (buf + I2NP_HEADER_SIZE, bufbe16toh (buf + I2NP_HEADER_SIZE_OFFSET));
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break;
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default:
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i2p::HandleI2NPMessage (CreateI2NPMessage (buf, GetI2NPMessageLength (buf), from));
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}
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}
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void ClientDestination::HandleDatabaseStoreMessage (const uint8_t * buf, size_t len)
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{
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uint32_t replyToken = bufbe32toh (buf + DATABASE_STORE_REPLY_TOKEN_OFFSET);
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size_t offset = DATABASE_STORE_HEADER_SIZE;
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if (replyToken)
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{
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LogPrint (eLogInfo, "Reply token is ignored for DatabaseStore");
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offset += 36;
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}
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if (buf[DATABASE_STORE_TYPE_OFFSET] == 1) // LeaseSet
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{
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LogPrint (eLogDebug, "Remote LeaseSet");
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auto it = m_RemoteLeaseSets.find (buf + DATABASE_STORE_KEY_OFFSET);
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if (it != m_RemoteLeaseSets.end ())
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{
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it->second->Update (buf + offset, len - offset);
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LogPrint (eLogDebug, "Remote LeaseSet updated");
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}
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else
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{
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LogPrint (eLogDebug, "New remote LeaseSet added");
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m_RemoteLeaseSets[buf + DATABASE_STORE_KEY_OFFSET] = std::make_shared<i2p::data::LeaseSet> (buf + offset, len - offset);
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}
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}
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else
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LogPrint (eLogError, "Unexpected client's DatabaseStore type ", buf[DATABASE_STORE_TYPE_OFFSET], ". Dropped");
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auto it1 = m_LeaseSetRequests.find (buf + DATABASE_STORE_KEY_OFFSET);
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if (it1 != m_LeaseSetRequests.end ())
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{
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it1->second->requestTimeoutTimer.cancel ();
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if (it1->second->requestComplete) it1->second->requestComplete (true);
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delete it1->second;
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m_LeaseSetRequests.erase (it1);
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}
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}
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void ClientDestination::HandleDatabaseSearchReplyMessage (const uint8_t * buf, size_t len)
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{
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i2p::data::IdentHash key (buf);
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int num = buf[32]; // num
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LogPrint ("DatabaseSearchReply for ", key.ToBase64 (), " num=", num);
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auto it = m_LeaseSetRequests.find (key);
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if (it != m_LeaseSetRequests.end ())
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{
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LeaseSetRequest * request = it->second;
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bool found = false;
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if (request->excluded.size () < MAX_NUM_FLOODFILLS_PER_REQUEST)
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{
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for (int i = 0; i < num; i++)
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{
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i2p::data::IdentHash peerHash (buf + 33 + i*32);
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auto floodfill = i2p::data::netdb.FindRouter (peerHash);
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if (floodfill)
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{
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LogPrint (eLogInfo, "Requesting ", key.ToBase64 (), " at ", peerHash.ToBase64 ());
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if (SendLeaseSetRequest (key, floodfill, request))
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found = true;
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}
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else
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{
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LogPrint (eLogInfo, "Found new floodfill. Request it");
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i2p::data::netdb.RequestDestination (peerHash);
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}
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}
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if (!found)
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LogPrint (eLogError, "Suggested floodfills are not presented in netDb");
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}
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else
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LogPrint (eLogInfo, key.ToBase64 (), " was not found on ", MAX_NUM_FLOODFILLS_PER_REQUEST," floodfills");
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if (!found)
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{
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if (request->requestComplete) request->requestComplete (false);
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delete request;
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m_LeaseSetRequests.erase (key);
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}
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}
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else
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LogPrint ("Request for ", key.ToBase64 (), " not found");
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}
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void ClientDestination::HandleDeliveryStatusMessage (I2NPMessage * msg)
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{
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uint32_t msgID = bufbe32toh (msg->GetPayload () + DELIVERY_STATUS_MSGID_OFFSET);
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if (msgID == m_PublishReplyToken)
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{
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LogPrint (eLogDebug, "Publishing confirmed");
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m_ExcludedFloodfills.clear ();
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m_PublishReplyToken = 0;
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i2p::DeleteI2NPMessage (msg);
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}
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else
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i2p::garlic::GarlicDestination::HandleDeliveryStatusMessage (msg);
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}
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void ClientDestination::SetLeaseSetUpdated ()
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{
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i2p::garlic::GarlicDestination::SetLeaseSetUpdated ();
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UpdateLeaseSet ();
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if (m_IsPublic)
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Publish ();
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}
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void ClientDestination::Publish ()
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{
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if (!m_LeaseSet || !m_Pool)
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{
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LogPrint (eLogError, "Can't publish non-existing LeaseSet");
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return;
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}
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if (m_PublishReplyToken)
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{
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LogPrint (eLogInfo, "Publishing is pending");
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return;
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}
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auto outbound = m_Pool->GetNextOutboundTunnel ();
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if (!outbound)
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{
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LogPrint ("Can't publish LeaseSet. No outbound tunnels");
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return;
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}
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std::set<i2p::data::IdentHash> excluded;
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auto floodfill = i2p::data::netdb.GetClosestFloodfill (m_LeaseSet->GetIdentHash (), m_ExcludedFloodfills);
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if (!floodfill)
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{
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LogPrint ("Can't publish LeaseSet. No more floodfills found");
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m_ExcludedFloodfills.clear ();
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return;
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}
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m_ExcludedFloodfills.insert (floodfill->GetIdentHash ());
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LogPrint (eLogDebug, "Publish LeaseSet of ", GetIdentHash ().ToBase32 ());
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m_PublishReplyToken = i2p::context.GetRandomNumberGenerator ().GenerateWord32 ();
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auto msg = WrapMessage (floodfill, i2p::CreateDatabaseStoreMsg (m_LeaseSet, m_PublishReplyToken));
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m_PublishConfirmationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_CONFIRMATION_TIMEOUT));
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m_PublishConfirmationTimer.async_wait (std::bind (&ClientDestination::HandlePublishConfirmationTimer,
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this, std::placeholders::_1));
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outbound->SendTunnelDataMsg (floodfill->GetIdentHash (), 0, msg);
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}
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void ClientDestination::HandlePublishConfirmationTimer (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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if (m_PublishReplyToken)
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{
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LogPrint (eLogWarning, "Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, "seconds. Try again");
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m_PublishReplyToken = 0;
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Publish ();
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}
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}
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}
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void ClientDestination::HandleDataMessage (const uint8_t * buf, size_t len)
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{
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uint32_t length = bufbe32toh (buf);
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buf += 4;
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// we assume I2CP payload
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switch (buf[9])
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{
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case PROTOCOL_TYPE_STREAMING:
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// streaming protocol
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if (m_StreamingDestination)
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m_StreamingDestination->HandleDataMessagePayload (buf, length);
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else
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LogPrint ("Missing streaming destination");
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break;
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case PROTOCOL_TYPE_DATAGRAM:
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// datagram protocol
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if (m_DatagramDestination)
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m_DatagramDestination->HandleDataMessagePayload (buf, length);
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else
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LogPrint ("Missing streaming destination");
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break;
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default:
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LogPrint ("Data: unexpected protocol ", buf[9]);
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}
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}
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void ClientDestination::CreateStream (StreamRequestComplete streamRequestComplete, const i2p::data::IdentHash& dest, int port) {
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assert(streamRequestComplete);
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auto leaseSet = FindLeaseSet (dest);
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if (leaseSet)
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streamRequestComplete(CreateStream (leaseSet, port));
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else
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{
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RequestDestination (dest,
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[this, streamRequestComplete, dest, port](bool success)
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{
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if (!success)
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streamRequestComplete (nullptr);
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else
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{
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auto leaseSet = FindLeaseSet (dest);
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if (leaseSet)
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streamRequestComplete(CreateStream (leaseSet, port));
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else
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streamRequestComplete (nullptr);
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}
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});
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}
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}
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std::shared_ptr<i2p::stream::Stream> ClientDestination::CreateStream (std::shared_ptr<const i2p::data::LeaseSet> remote, int port)
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{
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if (m_StreamingDestination)
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return m_StreamingDestination->CreateNewOutgoingStream (remote, port);
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else
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return nullptr;
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}
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void ClientDestination::AcceptStreams (const i2p::stream::StreamingDestination::Acceptor& acceptor)
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{
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if (m_StreamingDestination)
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m_StreamingDestination->SetAcceptor (acceptor);
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}
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void ClientDestination::StopAcceptingStreams ()
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{
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if (m_StreamingDestination)
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m_StreamingDestination->ResetAcceptor ();
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}
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bool ClientDestination::IsAcceptingStreams () const
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{
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if (m_StreamingDestination)
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return m_StreamingDestination->IsAcceptorSet ();
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return false;
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}
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i2p::datagram::DatagramDestination * ClientDestination::CreateDatagramDestination ()
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{
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if (!m_DatagramDestination)
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m_DatagramDestination = new i2p::datagram::DatagramDestination (*this);
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return m_DatagramDestination;
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}
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bool ClientDestination::RequestDestination (const i2p::data::IdentHash& dest, RequestComplete requestComplete)
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{
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if (!m_Pool || !IsReady ())
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{
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if (requestComplete) requestComplete (false);
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return false;
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}
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m_Service.post (std::bind (&ClientDestination::RequestLeaseSet, this, dest, requestComplete));
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return true;
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}
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void ClientDestination::RequestLeaseSet (const i2p::data::IdentHash& dest, RequestComplete requestComplete)
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{
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std::set<i2p::data::IdentHash> excluded;
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auto floodfill = i2p::data::netdb.GetClosestFloodfill (dest, excluded);
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if (floodfill)
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{
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LeaseSetRequest * request = new LeaseSetRequest (m_Service);
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request->requestComplete = requestComplete;
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auto ret = m_LeaseSetRequests.insert (std::pair<i2p::data::IdentHash, LeaseSetRequest *>(dest,request));
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if (ret.second) // inserted
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{
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if (!SendLeaseSetRequest (dest, floodfill, request))
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{
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// request failed
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if (request->requestComplete) request->requestComplete (false);
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delete request;
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m_LeaseSetRequests.erase (dest);
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}
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}
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else // duplicate
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{
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LogPrint (eLogError, "Request of ", dest.ToBase64 (), " is pending already");
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// TODO: queue up requests
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if (request->requestComplete) request->requestComplete (false);
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delete request;
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}
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}
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else
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LogPrint (eLogError, "No floodfills found");
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}
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bool ClientDestination::SendLeaseSetRequest (const i2p::data::IdentHash& dest,
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std::shared_ptr<const i2p::data::RouterInfo> nextFloodfill, LeaseSetRequest * request)
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{
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auto replyTunnel = m_Pool->GetNextInboundTunnel ();
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if (!replyTunnel) LogPrint (eLogError, "No inbound tunnels found");
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auto outboundTunnel = m_Pool->GetNextOutboundTunnel ();
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if (!outboundTunnel) LogPrint (eLogError, "No outbound tunnels found");
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|
|
|
if (replyTunnel && outboundTunnel)
|
|
{
|
|
request->excluded.insert (nextFloodfill->GetIdentHash ());
|
|
request->requestTime = i2p::util::GetSecondsSinceEpoch ();
|
|
request->requestTimeoutTimer.cancel ();
|
|
|
|
CryptoPP::AutoSeededRandomPool rnd;
|
|
uint8_t replyKey[32], replyTag[32];
|
|
rnd.GenerateBlock (replyKey, 32); // random session key
|
|
rnd.GenerateBlock (replyTag, 32); // random session tag
|
|
AddSessionKey (replyKey, replyTag);
|
|
|
|
I2NPMessage * msg = WrapMessage (nextFloodfill,
|
|
CreateLeaseSetDatabaseLookupMsg (dest, request->excluded,
|
|
replyTunnel.get (), replyKey, replyTag));
|
|
outboundTunnel->SendTunnelDataMsg (
|
|
{
|
|
i2p::tunnel::TunnelMessageBlock
|
|
{
|
|
i2p::tunnel::eDeliveryTypeRouter,
|
|
nextFloodfill->GetIdentHash (), 0, msg
|
|
}
|
|
});
|
|
request->requestTimeoutTimer.expires_from_now (boost::posix_time::seconds(LEASESET_REQUEST_TIMEOUT));
|
|
request->requestTimeoutTimer.async_wait (std::bind (&ClientDestination::HandleRequestTimoutTimer,
|
|
this, std::placeholders::_1, dest));
|
|
}
|
|
else
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
void ClientDestination::HandleRequestTimoutTimer (const boost::system::error_code& ecode, const i2p::data::IdentHash& dest)
|
|
{
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
{
|
|
auto it = m_LeaseSetRequests.find (dest);
|
|
if (it != m_LeaseSetRequests.end ())
|
|
{
|
|
bool done = false;
|
|
uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
|
|
if (ts < it->second->requestTime + MAX_LEASESET_REQUEST_TIMEOUT)
|
|
{
|
|
auto floodfill = i2p::data::netdb.GetClosestFloodfill (dest, it->second->excluded);
|
|
if (floodfill)
|
|
done = !SendLeaseSetRequest (dest, floodfill, it->second);
|
|
else
|
|
done = true;
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogInfo, dest.ToBase64 (), " was not found within ", MAX_LEASESET_REQUEST_TIMEOUT, " seconds");
|
|
done = true;
|
|
}
|
|
|
|
if (done)
|
|
{
|
|
if (it->second->requestComplete) it->second->requestComplete (false);
|
|
delete it->second;
|
|
m_LeaseSetRequests.erase (it);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void ClientDestination::HandleCleanupTimer (const boost::system::error_code& ecode)
|
|
{
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
{
|
|
CleanupRoutingSessions ();
|
|
CleanupRemoteLeaseSets ();
|
|
m_CleanupTimer.expires_from_now (boost::posix_time::minutes (DESTINATION_CLEANUP_TIMEOUT));
|
|
m_CleanupTimer.async_wait (std::bind (&ClientDestination::HandleCleanupTimer,
|
|
this, std::placeholders::_1));
|
|
}
|
|
}
|
|
|
|
void ClientDestination::CleanupRemoteLeaseSets ()
|
|
{
|
|
for (auto it = m_RemoteLeaseSets.begin (); it != m_RemoteLeaseSets.end ();)
|
|
{
|
|
if (!it->second->HasNonExpiredLeases ()) // all leases expired
|
|
{
|
|
LogPrint ("Remote LeaseSet ", it->second->GetIdentHash ().ToBase64 (), " expired");
|
|
it = m_RemoteLeaseSets.erase (it);
|
|
}
|
|
else
|
|
it++;
|
|
}
|
|
}
|
|
}
|
|
}
|