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622 lines
16 KiB
C++
622 lines
16 KiB
C++
#include "I2PEndian.h"
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#include <thread>
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#include <algorithm>
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#include <vector>
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#include <cryptopp/sha.h>
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#include "RouterContext.h"
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#include "Log.h"
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#include "Timestamp.h"
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#include "I2NPProtocol.h"
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#include "Transports.h"
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#include "NetDb.h"
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#include "Tunnel.h"
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namespace i2p
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{
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namespace tunnel
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{
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Tunnel::Tunnel (TunnelConfig * config):
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m_Config (config), m_Pool (nullptr), m_State (eTunnelStatePending)
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{
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}
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Tunnel::~Tunnel ()
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{
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delete m_Config;
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}
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void Tunnel::Build (uint32_t replyMsgID, OutboundTunnel * outboundTunnel)
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{
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CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
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auto numHops = m_Config->GetNumHops ();
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int numRecords = numHops <= STANDARD_NUM_RECORDS ? STANDARD_NUM_RECORDS : numHops;
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I2NPMessage * msg = NewI2NPMessage ();
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*msg->GetPayload () = numRecords;
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msg->len += numRecords*sizeof (I2NPBuildRequestRecordElGamalEncrypted) + 1;
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// shuffle records
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std::vector<int> recordIndicies;
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for (int i = 0; i < numRecords; i++) recordIndicies.push_back(i);
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std::random_shuffle (recordIndicies.begin(), recordIndicies.end());
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// create real records
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I2NPBuildRequestRecordElGamalEncrypted * records = (I2NPBuildRequestRecordElGamalEncrypted *)(msg->GetPayload () + 1);
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TunnelHopConfig * hop = m_Config->GetFirstHop ();
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int i = 0;
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while (hop)
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{
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int idx = recordIndicies[i];
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EncryptBuildRequestRecord (*hop->router,
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CreateBuildRequestRecord (hop->router->GetIdentHash (),
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hop->tunnelID,
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hop->nextRouter->GetIdentHash (),
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hop->nextTunnelID,
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hop->layerKey, hop->ivKey,
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hop->replyKey, hop->replyIV,
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hop->next ? rnd.GenerateWord32 () : replyMsgID, // we set replyMsgID for last hop only
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hop->isGateway, hop->isEndpoint),
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records[idx]);
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hop->recordIndex = idx;
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i++;
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hop = hop->next;
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}
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// fill up fake records with random data
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for (int i = numHops; i < numRecords; i++)
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{
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int idx = recordIndicies[i];
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rnd.GenerateBlock ((uint8_t *)(records + idx), sizeof (records[idx]));
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}
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// decrypt real records
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i2p::crypto::CBCDecryption decryption;
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hop = m_Config->GetLastHop ()->prev;
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while (hop)
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{
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decryption.SetKey (hop->replyKey);
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// decrypt records after current hop
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TunnelHopConfig * hop1 = hop->next;
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while (hop1)
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{
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decryption.SetIV (hop->replyIV);
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decryption.Decrypt((uint8_t *)&records[hop1->recordIndex],
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sizeof (I2NPBuildRequestRecordElGamalEncrypted),
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(uint8_t *)&records[hop1->recordIndex]);
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hop1 = hop1->next;
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}
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hop = hop->prev;
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}
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FillI2NPMessageHeader (msg, eI2NPVariableTunnelBuild);
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// send message
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if (outboundTunnel)
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outboundTunnel->SendTunnelDataMsg (GetNextIdentHash (), 0, msg);
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else
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i2p::transport::transports.SendMessage (GetNextIdentHash (), msg);
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}
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bool Tunnel::HandleTunnelBuildResponse (uint8_t * msg, size_t len)
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{
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LogPrint ("TunnelBuildResponse ", (int)msg[0], " records.");
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i2p::crypto::CBCDecryption decryption;
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TunnelHopConfig * hop = m_Config->GetLastHop ();
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while (hop)
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{
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decryption.SetKey (hop->replyKey);
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// decrypt records before and including current hop
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TunnelHopConfig * hop1 = hop;
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while (hop1)
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{
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auto idx = hop1->recordIndex;
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if (idx >= 0 && idx < msg[0])
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{
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uint8_t * record = msg + 1 + idx*sizeof (I2NPBuildResponseRecord);
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decryption.SetIV (hop->replyIV);
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decryption.Decrypt(record, sizeof (I2NPBuildResponseRecord), record);
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}
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else
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LogPrint ("Tunnel hop index ", idx, " is out of range");
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hop1 = hop1->prev;
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}
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hop = hop->prev;
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}
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bool established = true;
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hop = m_Config->GetFirstHop ();
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while (hop)
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{
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I2NPBuildResponseRecord * record = (I2NPBuildResponseRecord *)(msg + 1 + hop->recordIndex*sizeof (I2NPBuildResponseRecord));
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LogPrint ("Ret code=", (int)record->ret);
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if (record->ret)
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// if any of participants declined the tunnel is not established
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established = false;
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hop = hop->next;
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}
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if (established)
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{
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// change reply keys to layer keys
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hop = m_Config->GetFirstHop ();
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while (hop)
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{
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hop->decryption.SetKeys (hop->layerKey, hop->ivKey);
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hop = hop->next;
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}
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}
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if (established) m_State = eTunnelStateEstablished;
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return established;
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}
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void Tunnel::EncryptTunnelMsg (I2NPMessage * tunnelMsg)
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{
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uint8_t * payload = tunnelMsg->GetPayload () + 4;
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TunnelHopConfig * hop = m_Config->GetLastHop ();
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while (hop)
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{
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hop->decryption.Decrypt (payload);
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hop = hop->prev;
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}
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}
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void InboundTunnel::HandleTunnelDataMsg (I2NPMessage * msg)
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{
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if (IsFailed ()) SetState (eTunnelStateEstablished); // incoming messages means a tunnel is alive
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msg->from = this;
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EncryptTunnelMsg (msg);
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m_Endpoint.HandleDecryptedTunnelDataMsg (msg);
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}
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void OutboundTunnel::SendTunnelDataMsg (const uint8_t * gwHash, uint32_t gwTunnel, i2p::I2NPMessage * msg)
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{
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TunnelMessageBlock block;
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if (gwHash)
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{
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block.hash = gwHash;
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if (gwTunnel)
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{
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block.deliveryType = eDeliveryTypeTunnel;
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block.tunnelID = gwTunnel;
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}
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else
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block.deliveryType = eDeliveryTypeRouter;
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}
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else
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block.deliveryType = eDeliveryTypeLocal;
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block.data = msg;
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std::unique_lock<std::mutex> l(m_SendMutex);
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m_Gateway.SendTunnelDataMsg (block);
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}
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void OutboundTunnel::SendTunnelDataMsg (const std::vector<TunnelMessageBlock>& msgs)
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{
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std::unique_lock<std::mutex> l(m_SendMutex);
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for (auto& it : msgs)
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m_Gateway.PutTunnelDataMsg (it);
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m_Gateway.SendBuffer ();
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}
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Tunnels tunnels;
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Tunnels::Tunnels (): m_IsRunning (false), m_Thread (nullptr), m_ExploratoryPool (nullptr)
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{
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}
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Tunnels::~Tunnels ()
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{
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for (auto& it : m_OutboundTunnels)
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delete it;
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m_OutboundTunnels.clear ();
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for (auto& it : m_InboundTunnels)
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delete it.second;
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m_InboundTunnels.clear ();
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for (auto& it : m_TransitTunnels)
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delete it.second;
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m_TransitTunnels.clear ();
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/*for (auto& it : m_PendingTunnels)
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delete it.second;
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m_PendingTunnels.clear ();*/
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for (auto& it: m_Pools)
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delete it;
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m_Pools.clear ();
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}
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InboundTunnel * Tunnels::GetInboundTunnel (uint32_t tunnelID)
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{
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auto it = m_InboundTunnels.find(tunnelID);
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if (it != m_InboundTunnels.end ())
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return it->second;
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return nullptr;
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}
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TransitTunnel * Tunnels::GetTransitTunnel (uint32_t tunnelID)
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{
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auto it = m_TransitTunnels.find(tunnelID);
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if (it != m_TransitTunnels.end ())
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return it->second;
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return nullptr;
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}
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Tunnel * Tunnels::GetPendingTunnel (uint32_t replyMsgID)
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{
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auto it = m_PendingTunnels.find(replyMsgID);
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if (it != m_PendingTunnels.end () && it->second->GetState () == eTunnelStatePending)
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{
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it->second->SetState (eTunnelStateBuildReplyReceived);
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return it->second;
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}
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return nullptr;
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}
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InboundTunnel * Tunnels::GetNextInboundTunnel ()
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{
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InboundTunnel * tunnel = nullptr;
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size_t minReceived = 0;
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
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for (auto it : m_InboundTunnels)
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{
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if (!it.second->IsEstablished ()) continue;
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if (!tunnel || it.second->GetNumReceivedBytes () < minReceived)
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{
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tunnel = it.second;
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minReceived = it.second->GetNumReceivedBytes ();
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}
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}
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return tunnel;
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}
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OutboundTunnel * Tunnels::GetNextOutboundTunnel ()
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{
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CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
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uint32_t ind = rnd.GenerateWord32 (0, m_OutboundTunnels.size () - 1), i = 0;
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OutboundTunnel * tunnel = nullptr;
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
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for (auto it: m_OutboundTunnels)
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{
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if (it->IsEstablished ())
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{
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tunnel = it;
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i++;
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}
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if (i > ind && tunnel) break;
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}
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return tunnel;
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}
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TunnelPool * Tunnels::CreateTunnelPool (i2p::garlic::GarlicDestination * localDestination, int numInboundHops, int numOutboundHops)
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{
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auto pool = new TunnelPool (localDestination, numInboundHops, numOutboundHops);
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std::unique_lock<std::mutex> l(m_PoolsMutex);
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m_Pools.push_back (pool);
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return pool;
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}
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void Tunnels::DeleteTunnelPool (TunnelPool * pool)
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{
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if (pool)
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{
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StopTunnelPool (pool);
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{
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std::unique_lock<std::mutex> l(m_PoolsMutex);
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m_Pools.remove (pool);
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}
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for (auto it: m_PendingTunnels)
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if (it.second->GetTunnelPool () == pool)
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it.second->SetTunnelPool (nullptr);
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delete pool;
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}
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}
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void Tunnels::StopTunnelPool (TunnelPool * pool)
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{
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if (pool)
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{
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pool->SetActive (false);
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pool->DetachTunnels ();
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}
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}
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void Tunnels::AddTransitTunnel (TransitTunnel * tunnel)
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{
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std::unique_lock<std::mutex> l(m_TransitTunnelsMutex);
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m_TransitTunnels[tunnel->GetTunnelID ()] = tunnel;
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}
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void Tunnels::Start ()
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{
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m_IsRunning = true;
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m_Thread = new std::thread (std::bind (&Tunnels::Run, this));
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}
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void Tunnels::Stop ()
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{
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m_IsRunning = false;
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m_Queue.WakeUp ();
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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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void Tunnels::Run ()
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{
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std::this_thread::sleep_for (std::chrono::seconds(1)); // wait for other parts are ready
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uint64_t lastTs = 0;
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while (m_IsRunning)
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{
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try
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{
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I2NPMessage * msg = m_Queue.GetNextWithTimeout (1000); // 1 sec
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while (msg)
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{
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uint32_t tunnelID = bufbe32toh (msg->GetPayload ());
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InboundTunnel * tunnel = GetInboundTunnel (tunnelID);
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if (tunnel)
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tunnel->HandleTunnelDataMsg (msg);
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else
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{
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TransitTunnel * transitTunnel = GetTransitTunnel (tunnelID);
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if (transitTunnel)
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transitTunnel->HandleTunnelDataMsg (msg);
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else
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{
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LogPrint ("Tunnel ", tunnelID, " not found");
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i2p::DeleteI2NPMessage (msg);
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}
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}
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msg = m_Queue.Get ();
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}
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uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
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if (ts - lastTs >= 15) // manage tunnels every 15 seconds
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{
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ManageTunnels ();
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lastTs = ts;
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}
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}
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catch (std::exception& ex)
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{
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LogPrint ("Tunnels: ", ex.what ());
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}
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}
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}
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void Tunnels::ManageTunnels ()
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{
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ManagePendingTunnels ();
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ManageInboundTunnels ();
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ManageOutboundTunnels ();
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ManageTransitTunnels ();
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ManageTunnelPools ();
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}
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void Tunnels::ManagePendingTunnels ()
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{
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// check pending tunnel. delete failed or timeout
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uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
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for (auto it = m_PendingTunnels.begin (); it != m_PendingTunnels.end ();)
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{
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auto tunnel = it->second;
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switch (tunnel->GetState ())
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{
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case eTunnelStatePending:
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if (ts > tunnel->GetCreationTime () + TUNNEL_CREATION_TIMEOUT)
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{
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LogPrint ("Pending tunnel build request ", it->first, " timeout. Deleted");
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delete tunnel;
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it = m_PendingTunnels.erase (it);
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}
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else
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it++;
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break;
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case eTunnelStateBuildFailed:
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LogPrint ("Pending tunnel build request ", it->first, " failed. Deleted");
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delete tunnel;
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it = m_PendingTunnels.erase (it);
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break;
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case eTunnelStateBuildReplyReceived:
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// intermidiate state, will be either established of build failed
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it++;
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break;
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default:
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it = m_PendingTunnels.erase (it);
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}
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}
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}
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void Tunnels::ManageOutboundTunnels ()
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{
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uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
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{
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for (auto it = m_OutboundTunnels.begin (); it != m_OutboundTunnels.end ();)
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{
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auto tunnel = *it;
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if (ts > tunnel->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
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{
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LogPrint ("Tunnel ", tunnel->GetTunnelID (), " expired");
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{
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std::unique_lock<std::mutex> l(m_PoolsMutex);
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auto pool = tunnel->GetTunnelPool ();
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if (pool)
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pool->TunnelExpired (tunnel);
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}
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{
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
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it = m_OutboundTunnels.erase (it);
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}
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delete tunnel;
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}
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else
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{
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if (tunnel->IsEstablished () && ts + TUNNEL_EXPIRATION_THRESHOLD > tunnel->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
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tunnel->SetState (eTunnelStateExpiring);
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it++;
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}
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}
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}
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if (m_OutboundTunnels.size () < 5)
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{
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// trying to create one more oubound tunnel
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InboundTunnel * inboundTunnel = GetNextInboundTunnel ();
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if (!inboundTunnel) return;
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LogPrint ("Creating one hop outbound tunnel...");
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CreateTunnel<OutboundTunnel> (
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new TunnelConfig (std::vector<std::shared_ptr<const i2p::data::RouterInfo> >
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{
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i2p::data::netdb.GetRandomRouter ()
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},
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inboundTunnel->GetTunnelConfig ()));
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}
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}
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void Tunnels::ManageInboundTunnels ()
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{
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uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
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{
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for (auto it = m_InboundTunnels.begin (); it != m_InboundTunnels.end ();)
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{
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auto tunnel = it->second;
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if (ts > tunnel->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
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{
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LogPrint ("Tunnel ", tunnel->GetTunnelID (), " expired");
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{
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std::unique_lock<std::mutex> l(m_PoolsMutex);
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auto pool = tunnel->GetTunnelPool ();
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if (pool)
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pool->TunnelExpired (tunnel);
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}
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{
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
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it = m_InboundTunnels.erase (it);
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}
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delete tunnel;
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}
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else
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{
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if (tunnel->IsEstablished () && ts + TUNNEL_EXPIRATION_THRESHOLD > tunnel->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
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tunnel->SetState (eTunnelStateExpiring);
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it++;
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}
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}
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}
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if (m_InboundTunnels.empty ())
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{
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LogPrint ("Creating zero hops inbound tunnel...");
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CreateZeroHopsInboundTunnel ();
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if (!m_ExploratoryPool)
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m_ExploratoryPool = CreateTunnelPool (&i2p::context, 2, 2); // 2-hop exploratory
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return;
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}
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if (m_OutboundTunnels.empty () || m_InboundTunnels.size () < 5)
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{
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// trying to create one more inbound tunnel
|
|
LogPrint ("Creating one hop inbound tunnel...");
|
|
CreateTunnel<InboundTunnel> (
|
|
new TunnelConfig (std::vector<std::shared_ptr<const i2p::data::RouterInfo> >
|
|
{
|
|
i2p::data::netdb.GetRandomRouter ()
|
|
}));
|
|
}
|
|
}
|
|
|
|
void Tunnels::ManageTransitTunnels ()
|
|
{
|
|
uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
|
|
for (auto it = m_TransitTunnels.begin (); it != m_TransitTunnels.end ();)
|
|
{
|
|
if (ts > it->second->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
|
|
{
|
|
LogPrint ("Transit tunnel ", it->second->GetTunnelID (), " expired");
|
|
auto tmp = it->second;
|
|
{
|
|
std::unique_lock<std::mutex> l(m_TransitTunnelsMutex);
|
|
it = m_TransitTunnels.erase (it);
|
|
}
|
|
delete tmp;
|
|
}
|
|
else
|
|
it++;
|
|
}
|
|
}
|
|
|
|
void Tunnels::ManageTunnelPools ()
|
|
{
|
|
std::unique_lock<std::mutex> l(m_PoolsMutex);
|
|
for (auto it: m_Pools)
|
|
{
|
|
TunnelPool * pool = it;
|
|
if (pool->IsActive ())
|
|
{
|
|
pool->CreateTunnels ();
|
|
pool->TestTunnels ();
|
|
}
|
|
}
|
|
}
|
|
|
|
void Tunnels::PostTunnelData (I2NPMessage * msg)
|
|
{
|
|
if (msg) m_Queue.Put (msg);
|
|
}
|
|
|
|
template<class TTunnel>
|
|
TTunnel * Tunnels::CreateTunnel (TunnelConfig * config, OutboundTunnel * outboundTunnel)
|
|
{
|
|
TTunnel * newTunnel = new TTunnel (config);
|
|
uint32_t replyMsgID = i2p::context.GetRandomNumberGenerator ().GenerateWord32 ();
|
|
m_PendingTunnels[replyMsgID] = newTunnel;
|
|
newTunnel->Build (replyMsgID, outboundTunnel);
|
|
return newTunnel;
|
|
}
|
|
|
|
void Tunnels::AddOutboundTunnel (OutboundTunnel * newTunnel)
|
|
{
|
|
std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
|
|
m_OutboundTunnels.push_back (newTunnel);
|
|
auto pool = newTunnel->GetTunnelPool ();
|
|
if (pool && pool->IsActive ())
|
|
pool->TunnelCreated (newTunnel);
|
|
else
|
|
newTunnel->SetTunnelPool (nullptr);
|
|
}
|
|
|
|
void Tunnels::AddInboundTunnel (InboundTunnel * newTunnel)
|
|
{
|
|
std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
|
|
m_InboundTunnels[newTunnel->GetTunnelID ()] = newTunnel;
|
|
auto pool = newTunnel->GetTunnelPool ();
|
|
if (!pool)
|
|
{
|
|
// build symmetric outbound tunnel
|
|
CreateTunnel<OutboundTunnel> (newTunnel->GetTunnelConfig ()->Invert (), GetNextOutboundTunnel ());
|
|
}
|
|
else
|
|
{
|
|
if (pool->IsActive ())
|
|
pool->TunnelCreated (newTunnel);
|
|
else
|
|
newTunnel->SetTunnelPool (nullptr);
|
|
}
|
|
}
|
|
|
|
|
|
void Tunnels::CreateZeroHopsInboundTunnel ()
|
|
{
|
|
CreateTunnel<InboundTunnel> (
|
|
new TunnelConfig (std::vector<std::shared_ptr<const i2p::data::RouterInfo> >
|
|
{
|
|
i2p::context.GetSharedRouterInfo ()
|
|
}));
|
|
}
|
|
}
|
|
}
|