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514 lines
15 KiB
C++
514 lines
15 KiB
C++
#include <algorithm>
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#include <boost/lexical_cast.hpp>
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#include <cryptopp/dh.h>
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#include "Log.h"
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#include "util.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)
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{
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CryptoPP::DH dh (i2p::crypto::elgp, i2p::crypto::elgg);
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dh.GenerateKeyPair(i2p::context.GetRandomNumberGenerator (), m_EncryptionPrivateKey, m_EncryptionPublicKey);
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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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for (auto it: m_RemoteLeaseSets)
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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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m_Pool->SetLocalDestination (this);
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m_Pool->SetActive (true);
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m_IsRunning = 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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}
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void ClientDestination::Stop ()
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{
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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_IsRunning = false;
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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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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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{
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LogPrint ("All leases of remote LeaseSet expired. Request it");
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RequestDestination (ident);
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}
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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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ls = new i2p::data::LeaseSet (*ls);
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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, i2p::tunnel::InboundTunnel * from)
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{
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I2NPHeader * header = (I2NPHeader *)buf;
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switch (header->typeID)
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{
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case eI2NPData:
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HandleDataMessage (buf + sizeof (I2NPHeader), be16toh (header->size));
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break;
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case eI2NPDatabaseStore:
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HandleDatabaseStoreMessage (buf + sizeof (I2NPHeader), be16toh (header->size));
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break;
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case eI2NPDatabaseSearchReply:
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HandleDatabaseSearchReplyMessage (buf + sizeof (I2NPHeader), be16toh (header->size));
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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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I2NPDatabaseStoreMsg * msg = (I2NPDatabaseStoreMsg *)buf;
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size_t offset = sizeof (I2NPDatabaseStoreMsg);
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if (msg->replyToken) // TODO:
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offset += 36;
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if (msg->type == 1) // LeaseSet
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{
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LogPrint (eLogDebug, "Remote LeaseSet");
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auto it = m_RemoteLeaseSets.find (msg->key);
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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[msg->key] = new 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 ", msg->type, ". Dropped");
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auto it1 = m_LeaseSetRequests.find (msg->key);
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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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I2NPDeliveryStatusMsg * deliveryStatus = (I2NPDeliveryStatusMsg *)msg->GetPayload ();
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uint32_t msgID = be32toh (deliveryStatus->msgID);
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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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std::shared_ptr<i2p::stream::Stream> ClientDestination::CreateStream (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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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 ()) return false;
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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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m_LeaseSetRequests[dest] = request;
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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
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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)
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{
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request->excluded.insert (nextFloodfill->GetIdentHash ());
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request->requestTime = i2p::util::GetSecondsSinceEpoch ();
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request->requestTimeoutTimer.cancel ();
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I2NPMessage * msg = WrapMessage (*nextFloodfill,
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CreateDatabaseLookupMsg (dest, replyTunnel->GetNextIdentHash (),
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replyTunnel->GetNextTunnelID (), false, &request->excluded, true, m_Pool));
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outboundTunnel->SendTunnelDataMsg (
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{
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i2p::tunnel::TunnelMessageBlock
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{
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i2p::tunnel::eDeliveryTypeRouter,
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nextFloodfill->GetIdentHash (), 0, msg
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}
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});
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request->requestTimeoutTimer.expires_from_now (boost::posix_time::seconds(LEASESET_REQUEST_TIMEOUT));
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request->requestTimeoutTimer.async_wait (std::bind (&ClientDestination::HandleRequestTimoutTimer,
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this, std::placeholders::_1, dest));
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}
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else
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return false;
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return true;
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}
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void ClientDestination::HandleRequestTimoutTimer (const boost::system::error_code& ecode, const i2p::data::IdentHash& dest)
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{
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if (ecode != boost::asio::error::operation_aborted)
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{
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auto it = m_LeaseSetRequests.find (dest);
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if (it != m_LeaseSetRequests.end ())
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{
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bool done = false;
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uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
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if (ts < it->second->requestTime + MAX_LEASESET_REQUEST_TIMEOUT)
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{
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auto floodfill = i2p::data::netdb.GetClosestFloodfill (dest, it->second->excluded);
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if (floodfill)
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SendLeaseSetRequest (dest, floodfill, it->second);
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else
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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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|