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I2P: End-to-End encrypted and anonymous Internet
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695 lines
19 KiB
695 lines
19 KiB
#include "I2PEndian.h" |
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#include <fstream> |
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#include <vector> |
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#include <boost/asio.hpp> |
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#include <cryptopp/gzip.h> |
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#include "base64.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 "Tunnel.h" |
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#include "Transports.h" |
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#include "RouterContext.h" |
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#include "Garlic.h" |
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#include "NetDb.h" |
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#include "Reseed.h" |
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#include "util.h" |
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namespace i2p |
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{ |
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namespace data |
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{ |
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I2NPMessage * RequestedDestination::CreateRequestMessage (const RouterInfo * router, |
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const i2p::tunnel::InboundTunnel * replyTunnel) |
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{ |
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I2NPMessage * msg = i2p::CreateDatabaseLookupMsg (m_Destination, |
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replyTunnel->GetNextIdentHash (), replyTunnel->GetNextTunnelID (), m_IsExploratory, &m_ExcludedPeers); |
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if (m_IsLeaseSet) // wrap lookup message into garlic |
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msg = i2p::garlic::routing.WrapSingleMessage (*router, msg); |
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m_ExcludedPeers.insert (router->GetIdentHash ()); |
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m_LastRouter = router; |
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m_LastReplyTunnel = replyTunnel; |
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return msg; |
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} |
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I2NPMessage * RequestedDestination::CreateRequestMessage (const IdentHash& floodfill) |
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{ |
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I2NPMessage * msg = i2p::CreateDatabaseLookupMsg (m_Destination, |
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i2p::context.GetRouterInfo ().GetIdentHash () , 0, false, &m_ExcludedPeers); |
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m_ExcludedPeers.insert (floodfill); |
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m_LastRouter = nullptr; |
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m_LastReplyTunnel = nullptr; |
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return msg; |
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} |
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#ifndef _WIN32 |
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const char NetDb::m_NetDbPath[] = "/netDb"; |
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#else |
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const char NetDb::m_NetDbPath[] = "\\netDb"; |
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#endif |
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NetDb netdb; |
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NetDb::NetDb (): m_IsRunning (false), m_ReseedRetries (0), m_Thread (0) |
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{ |
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} |
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NetDb::~NetDb () |
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{ |
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Stop (); |
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for (auto l:m_LeaseSets) |
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delete l.second; |
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for (auto r:m_RouterInfos) |
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delete r.second; |
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for (auto r:m_RequestedDestinations) |
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delete r.second; |
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} |
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void NetDb::Start () |
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{ |
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Load (m_NetDbPath); |
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while (m_RouterInfos.size () < 100 && m_ReseedRetries < 10) |
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{ |
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Reseeder reseeder; |
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reseeder.reseedNow(); |
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m_ReseedRetries++; |
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Load (m_NetDbPath); |
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} |
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m_Thread = new std::thread (std::bind (&NetDb::Run, this)); |
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} |
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void NetDb::Stop () |
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{ |
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if (m_Thread) |
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{ |
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m_IsRunning = false; |
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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 NetDb::Run () |
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{ |
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uint32_t lastSave = 0, lastPublish = 0; |
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m_IsRunning = true; |
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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 (10000); // 10 sec |
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if (msg) |
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{ |
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while (msg) |
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{ |
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if (msg->GetHeader ()->typeID == eI2NPDatabaseStore) |
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{ |
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HandleDatabaseStoreMsg (msg->GetPayload (), msg->GetLength ()); // TODO |
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i2p::DeleteI2NPMessage (msg); |
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} |
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else if (msg->GetHeader ()->typeID == eI2NPDatabaseSearchReply) |
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HandleDatabaseSearchReplyMsg (msg); |
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else // WTF? |
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{ |
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LogPrint ("NetDb: unexpected message type ", msg->GetHeader ()->typeID); |
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i2p::HandleI2NPMessage (msg); |
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} |
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msg = m_Queue.Get (); |
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} |
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} |
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else // if no new DatabaseStore coming, explore it |
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Explore (); |
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uint64_t ts = i2p::util::GetSecondsSinceEpoch (); |
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if (ts - lastSave >= 60) // save routers and validate subscriptions every minute |
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{ |
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if (lastSave) |
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{ |
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SaveUpdated (m_NetDbPath); |
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ValidateSubscriptions (); |
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} |
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lastSave = ts; |
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} |
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if (ts - lastPublish >= 600) // publish every 10 minutes |
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{ |
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Publish (); |
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lastPublish = 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 ("NetDb: ", ex.what ()); |
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} |
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} |
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} |
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void NetDb::AddRouterInfo (uint8_t * buf, int len) |
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{ |
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RouterInfo * r = new RouterInfo (buf, len); |
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DeleteRequestedDestination (r->GetIdentHash ()); |
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auto it = m_RouterInfos.find(r->GetIdentHash ()); |
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if (it != m_RouterInfos.end ()) |
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{ |
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if (r->GetTimestamp () > it->second->GetTimestamp ()) |
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{ |
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LogPrint ("RouterInfo updated"); |
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*(it->second) = *r; // we can't replace pointer because it's used by tunnels |
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} |
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delete r; |
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} |
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else |
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{ |
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LogPrint ("New RouterInfo added"); |
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m_RouterInfos[r->GetIdentHash ()] = r; |
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} |
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} |
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void NetDb::AddLeaseSet (uint8_t * buf, int len) |
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{ |
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LeaseSet * l = new LeaseSet (buf, len); |
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DeleteRequestedDestination (l->GetIdentHash ()); |
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auto it = m_LeaseSets.find(l->GetIdentHash ()); |
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if (it != m_LeaseSets.end ()) |
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{ |
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LogPrint ("LeaseSet updated"); |
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*(it->second) = *l; // we can't replace pointer because it's used by streams |
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delete l; |
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} |
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else |
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{ |
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LogPrint ("New LeaseSet added"); |
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m_LeaseSets[l->GetIdentHash ()] = l; |
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} |
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} |
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RouterInfo * NetDb::FindRouter (const IdentHash& ident) const |
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{ |
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auto it = m_RouterInfos.find (ident); |
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if (it != m_RouterInfos.end ()) |
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return it->second; |
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else |
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return nullptr; |
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} |
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LeaseSet * NetDb::FindLeaseSet (const IdentHash& destination) const |
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{ |
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auto it = m_LeaseSets.find (destination); |
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if (it != m_LeaseSets.end ()) |
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return it->second; |
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else |
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return nullptr; |
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} |
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// TODO: Move to reseed and/or scheduled tasks. (In java version, scheduler fix this as well as sort RIs.) |
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bool NetDb::CreateNetDb(boost::filesystem::path directory) |
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{ |
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LogPrint (directory.string(), " doesn't exist, trying to create it."); |
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if (!boost::filesystem::create_directory (directory)) |
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{ |
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LogPrint("Failed to create directory ", directory.string()); |
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return false; |
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} |
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// list of chars might appear in base64 string |
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const char * chars = GetBase64SubstitutionTable (); // 64 bytes |
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boost::filesystem::path suffix; |
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for (int i = 0; i < 64; i++) |
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{ |
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#ifndef _WIN32 |
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suffix = std::string ("/r") + chars[i]; |
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#else |
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suffix = std::string ("\\r") + chars[i]; |
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#endif |
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if (!boost::filesystem::create_directory( boost::filesystem::path (directory / suffix) )) return false; |
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} |
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return true; |
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} |
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void NetDb::Load (const char * directory) |
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{ |
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boost::filesystem::path p (i2p::util::filesystem::GetDataDir()); |
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p /= (directory); |
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if (!boost::filesystem::exists (p)) |
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{ |
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// seems netDb doesn't exist yet |
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if (!CreateNetDb(p)) return; |
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} |
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// make sure we cleanup netDb from previous attempts |
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for (auto r: m_RouterInfos) |
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delete r.second; |
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m_RouterInfos.clear (); |
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// load routers now |
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int numRouters = 0; |
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boost::filesystem::directory_iterator end; |
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for (boost::filesystem::directory_iterator it (p); it != end; ++it) |
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{ |
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if (boost::filesystem::is_directory (it->status())) |
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{ |
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for (boost::filesystem::directory_iterator it1 (it->path ()); it1 != end; ++it1) |
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{ |
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#if BOOST_VERSION > 10500 |
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RouterInfo * r = new RouterInfo (it1->path().string().c_str ()); |
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#else |
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RouterInfo * r = new RouterInfo(it1->path().c_str()); |
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#endif |
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m_RouterInfos[r->GetIdentHash ()] = r; |
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numRouters++; |
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} |
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} |
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} |
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LogPrint (numRouters, " routers loaded"); |
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} |
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void NetDb::SaveUpdated (const char * directory) |
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{ |
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auto GetFilePath = [](const char * directory, const RouterInfo * routerInfo) |
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{ |
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#ifndef _WIN32 |
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return std::string (directory) + "/r" + |
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routerInfo->GetIdentHashBase64 ()[0] + "/routerInfo-" + |
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#else |
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return std::string (directory) + "\\r" + |
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routerInfo->GetIdentHashBase64 ()[0] + "\\routerInfo-" + |
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#endif |
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routerInfo->GetIdentHashBase64 () + ".dat"; |
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}; |
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boost::filesystem::path p (i2p::util::filesystem::GetDataDir()); |
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p /= (directory); |
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#if BOOST_VERSION > 10500 |
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const char * fullDirectory = p.string().c_str (); |
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#else |
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const char * fullDirectory = p.c_str (); |
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#endif |
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int count = 0, deletedCount = 0; |
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auto total = m_RouterInfos.size (); |
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uint64_t ts = i2p::util::GetMillisecondsSinceEpoch (); |
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for (auto it: m_RouterInfos) |
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{ |
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if (it.second->IsUpdated ()) |
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{ |
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std::ofstream r (GetFilePath(fullDirectory, it.second), std::ofstream::binary); |
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r.write ((char *)it.second->GetBuffer (), it.second->GetBufferLen ()); |
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it.second->SetUpdated (false); |
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count++; |
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} |
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else |
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{ |
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// RouterInfo expires in 72 hours if more than 300 |
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if (total > 300 && ts > it.second->GetTimestamp () + 3*24*3600*1000LL) // 3 days |
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{ |
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total--; |
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it.second->SetUnreachable (true); |
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} |
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if (it.second->IsUnreachable ()) |
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{ |
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if (boost::filesystem::exists (GetFilePath (fullDirectory, it.second))) |
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{ |
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boost::filesystem::remove (GetFilePath (fullDirectory, it.second)); |
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deletedCount++; |
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} |
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} |
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} |
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} |
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if (count > 0) |
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LogPrint (count," new/updated routers saved"); |
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if (deletedCount > 0) |
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LogPrint (deletedCount," routers deleted"); |
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} |
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void NetDb::RequestDestination (const IdentHash& destination, bool isLeaseSet) |
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{ |
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if (isLeaseSet) // we request LeaseSet through tunnels |
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{ |
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i2p::tunnel::OutboundTunnel * outbound = i2p::tunnel::tunnels.GetNextOutboundTunnel (); |
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if (outbound) |
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{ |
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i2p::tunnel::InboundTunnel * inbound = i2p::tunnel::tunnels.GetNextInboundTunnel (); |
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if (inbound) |
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{ |
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RequestedDestination * dest = CreateRequestedDestination (destination, isLeaseSet); |
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auto floodfill = GetClosestFloodfill (destination, dest->GetExcludedPeers ()); |
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if (floodfill) |
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{ |
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std::vector<i2p::tunnel::TunnelMessageBlock> msgs; |
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// DatabaseLookup message |
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dest->SetLastOutboundTunnel (outbound); |
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msgs.push_back (i2p::tunnel::TunnelMessageBlock |
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{ |
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i2p::tunnel::eDeliveryTypeRouter, |
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floodfill->GetIdentHash (), 0, |
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dest->CreateRequestMessage (floodfill, inbound) |
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}); |
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outbound->SendTunnelDataMsg (msgs); |
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} |
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else |
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LogPrint ("No more floodfills found"); |
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} |
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else |
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LogPrint ("No inbound tunnels found"); |
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} |
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else |
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LogPrint ("No outbound tunnels found"); |
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} |
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else // RouterInfo is requested directly |
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{ |
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RequestedDestination * dest = CreateRequestedDestination (destination, false); |
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auto floodfill = GetClosestFloodfill (destination, dest->GetExcludedPeers ()); |
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if (floodfill) |
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{ |
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dest->SetLastOutboundTunnel (nullptr); |
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i2p::transports.SendMessage (floodfill->GetIdentHash (), dest->CreateRequestMessage (floodfill->GetIdentHash ())); |
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} |
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} |
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} |
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void NetDb::HandleDatabaseStoreMsg (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) |
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offset += 36; |
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if (msg->type) |
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{ |
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LogPrint ("LeaseSet"); |
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AddLeaseSet (buf + offset, len - offset); |
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} |
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else |
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{ |
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LogPrint ("RouterInfo"); |
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size_t size = be16toh (*(uint16_t *)(buf + offset)); |
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if (size > 2048) |
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{ |
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LogPrint ("Invalid RouterInfo length ", (int)size); |
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return; |
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} |
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offset += 2; |
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CryptoPP::Gunzip decompressor; |
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decompressor.Put (buf + offset, size); |
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decompressor.MessageEnd(); |
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uint8_t uncompressed[2048]; |
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size_t uncomressedSize = decompressor.MaxRetrievable (); |
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decompressor.Get (uncompressed, uncomressedSize); |
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AddRouterInfo (uncompressed, uncomressedSize); |
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} |
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} |
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void NetDb::HandleDatabaseSearchReplyMsg (I2NPMessage * msg) |
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{ |
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uint8_t * buf = msg->GetPayload (); |
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char key[48]; |
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int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48); |
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key[l] = 0; |
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int num = buf[32]; // num |
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LogPrint ("DatabaseSearchReply for ", key, " num=", num); |
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auto it = m_RequestedDestinations.find (IdentHash (buf)); |
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if (it != m_RequestedDestinations.end ()) |
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{ |
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RequestedDestination * dest = it->second; |
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if (num > 0) |
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{ |
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i2p::tunnel::OutboundTunnel * outbound = dest->GetLastOutboundTunnel (); |
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const i2p::tunnel::InboundTunnel * inbound = dest->GetLastReplyTunnel (); |
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std::vector<i2p::tunnel::TunnelMessageBlock> msgs; |
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for (int i = 0; i < num; i++) |
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{ |
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uint8_t * router = buf + 33 + i*32; |
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char peerHash[48]; |
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int l1 = i2p::data::ByteStreamToBase64 (router, 32, peerHash, 48); |
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peerHash[l1] = 0; |
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LogPrint (i,": ", peerHash); |
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if (dest->IsExploratory ()) |
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{ |
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if (!FindRouter (router)) // router with ident not found |
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{ |
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LogPrint ("Found new router. Requesting RouterInfo ..."); |
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if (outbound && inbound) |
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{ |
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RequestedDestination * d1 = CreateRequestedDestination (router, false, false); |
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d1->SetLastOutboundTunnel (outbound); |
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auto msg = d1->CreateRequestMessage (dest->GetLastRouter (), dest->GetLastReplyTunnel ()); |
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msgs.push_back (i2p::tunnel::TunnelMessageBlock |
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{ |
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i2p::tunnel::eDeliveryTypeRouter, |
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dest->GetLastRouter ()->GetIdentHash (), 0, msg |
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}); |
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} |
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} |
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else |
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LogPrint ("Bayan"); |
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} |
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else |
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{ |
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// reply to our destination. Try other floodfills |
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if (outbound && inbound) |
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{ |
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auto r = FindRouter (router); |
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// do we have that floodfill router in our database? |
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if (r) |
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{ |
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// we do |
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if (!dest->IsExcluded (r->GetIdentHash ()) && dest->GetNumExcludedPeers () < 30) // TODO: fix TunnelGateway first |
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{ |
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// tell floodfill about us |
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msgs.push_back (i2p::tunnel::TunnelMessageBlock |
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{ |
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i2p::tunnel::eDeliveryTypeRouter, |
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r->GetIdentHash (), 0, |
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CreateDatabaseStoreMsg () |
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}); |
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// request destination |
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auto msg = dest->CreateRequestMessage (r, dest->GetLastReplyTunnel ()); |
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msgs.push_back (i2p::tunnel::TunnelMessageBlock |
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{ |
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i2p::tunnel::eDeliveryTypeRouter, |
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r->GetIdentHash (), 0, msg |
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}); |
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} |
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} |
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else |
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{ |
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// request router |
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LogPrint ("Found new floodfill. Request it"); |
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RequestedDestination * d2 = CreateRequestedDestination (router, false, false); |
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d2->SetLastOutboundTunnel (outbound); |
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I2NPMessage * msg = d2->CreateRequestMessage (dest->GetLastRouter (), inbound); |
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msgs.push_back (i2p::tunnel::TunnelMessageBlock |
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{ |
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i2p::tunnel::eDeliveryTypeRouter, |
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dest->GetLastRouter ()->GetIdentHash (), 0, msg |
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}); |
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} |
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} |
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else // we should send directly |
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{ |
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if (!dest->IsLeaseSet ()) // if not LeaseSet |
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{ |
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if (!dest->IsExcluded (router) && dest->GetNumExcludedPeers () < 30) |
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i2p::transports.SendMessage (router, dest->CreateRequestMessage (router)); |
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} |
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else |
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LogPrint ("Can't request LeaseSet"); |
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} |
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} |
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} |
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if (outbound && msgs.size () > 0) |
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outbound->SendTunnelDataMsg (msgs); |
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} |
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else |
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{ |
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// no more requests for detination possible. delete it |
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delete it->second; |
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m_RequestedDestinations.erase (it); |
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} |
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} |
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else |
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LogPrint ("Requested destination for ", key, " not found"); |
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i2p::DeleteI2NPMessage (msg); |
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} |
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void NetDb::Explore () |
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{ |
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auto outbound = i2p::tunnel::tunnels.GetNextOutboundTunnel (); |
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auto inbound = i2p::tunnel::tunnels.GetNextInboundTunnel (); |
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if (outbound && inbound) |
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{ |
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CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator (); |
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uint8_t randomHash[32]; |
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rnd.GenerateBlock (randomHash, 32); |
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RequestedDestination * dest = CreateRequestedDestination (IdentHash (randomHash), false, true); |
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dest->SetLastOutboundTunnel (outbound); |
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auto floodfill = GetClosestFloodfill (randomHash, dest->GetExcludedPeers ()); |
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if (floodfill) |
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{ |
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LogPrint ("Exploring new routers ..."); |
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std::vector<i2p::tunnel::TunnelMessageBlock> msgs; |
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msgs.push_back (i2p::tunnel::TunnelMessageBlock |
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{ |
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i2p::tunnel::eDeliveryTypeRouter, |
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floodfill->GetIdentHash (), 0, |
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CreateDatabaseStoreMsg () // tell floodfill about us |
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}); |
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msgs.push_back (i2p::tunnel::TunnelMessageBlock |
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{ |
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i2p::tunnel::eDeliveryTypeRouter, |
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floodfill->GetIdentHash (), 0, |
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dest->CreateRequestMessage (floodfill, inbound) // explore |
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}); |
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outbound->SendTunnelDataMsg (msgs); |
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} |
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else |
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DeleteRequestedDestination (dest); |
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} |
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} |
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void NetDb::Publish () |
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{ |
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std::set<IdentHash> excluded; // TODO: fill up later |
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for (int i = 0; i < 3; i++) |
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{ |
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auto floodfill = GetClosestFloodfill (i2p::context.GetRouterInfo ().GetIdentHash (), excluded); |
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if (floodfill) |
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{ |
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LogPrint ("Publishing our RouterInfo to ", floodfill->GetIdentHashAbbreviation ()); |
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transports.SendMessage (floodfill->GetIdentHash (), CreateDatabaseStoreMsg ()); |
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excluded.insert (floodfill->GetIdentHash ()); |
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} |
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} |
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} |
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RequestedDestination * NetDb::CreateRequestedDestination (const IdentHash& dest, |
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bool isLeaseSet, bool isExploratory) |
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{ |
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auto it = m_RequestedDestinations.find (dest); |
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if (it == m_RequestedDestinations.end ()) // not exist yet |
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{ |
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RequestedDestination * d = new RequestedDestination (dest, isLeaseSet, isExploratory); |
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m_RequestedDestinations[dest] = d; |
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return d; |
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} |
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else |
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return it->second; |
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} |
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|
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void NetDb::DeleteRequestedDestination (const IdentHash& dest) |
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{ |
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auto it = m_RequestedDestinations.find (dest); |
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if (it != m_RequestedDestinations.end ()) |
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{ |
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delete it->second; |
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m_RequestedDestinations.erase (it); |
|
} |
|
} |
|
|
|
void NetDb::DeleteRequestedDestination (RequestedDestination * dest) |
|
{ |
|
if (dest) |
|
{ |
|
m_RequestedDestinations.erase (dest->GetDestination ()); |
|
delete dest; |
|
} |
|
} |
|
|
|
const RouterInfo * NetDb::GetRandomNTCPRouter (bool floodfillOnly) const |
|
{ |
|
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator (); |
|
uint32_t ind = rnd.GenerateWord32 (0, m_RouterInfos.size () - 1), i = 0; |
|
RouterInfo * last = nullptr; |
|
for (auto it: m_RouterInfos) |
|
{ |
|
if (it.second->IsNTCP () && !it.second->IsUnreachable () && |
|
(!floodfillOnly || it.second->IsFloodfill ())) |
|
last = it.second; |
|
if (i >= ind) break; |
|
else i++; |
|
} |
|
return last; |
|
} |
|
|
|
const RouterInfo * NetDb::GetRandomRouter (const RouterInfo * compatibleWith, bool floodfillOnly) const |
|
{ |
|
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator (); |
|
uint32_t ind = rnd.GenerateWord32 (0, m_RouterInfos.size () - 1); |
|
for (int j = 0; j < 2; j++) |
|
{ |
|
uint32_t i = 0; |
|
for (auto it: m_RouterInfos) |
|
{ |
|
if (i >= ind) |
|
{ |
|
if (!it.second->IsUnreachable () && |
|
(!compatibleWith || it.second->IsCompatible (*compatibleWith)) && |
|
(!floodfillOnly || it.second->IsFloodfill ())) |
|
return it.second; |
|
} |
|
else |
|
i++; |
|
} |
|
// we couldn't find anything, try second pass |
|
ind = 0; |
|
} |
|
return nullptr; // seem we have too few routers |
|
} |
|
|
|
void NetDb::PostI2NPMsg (I2NPMessage * msg) |
|
{ |
|
if (msg) m_Queue.Put (msg); |
|
} |
|
|
|
const RouterInfo * NetDb::GetClosestFloodfill (const IdentHash& destination, |
|
const std::set<IdentHash>& excluded) const |
|
{ |
|
RouterInfo * r = nullptr; |
|
XORMetric minMetric; |
|
RoutingKey destKey = CreateRoutingKey (destination); |
|
minMetric.SetMax (); |
|
for (auto it: m_RouterInfos) |
|
{ |
|
if (it.second->IsFloodfill () &&! it.second->IsUnreachable () && !excluded.count (it.first)) |
|
{ |
|
XORMetric m = destKey ^ it.second->GetRoutingKey (); |
|
if (m < minMetric) |
|
{ |
|
minMetric = m; |
|
r = it.second; |
|
} |
|
} |
|
} |
|
return r; |
|
} |
|
|
|
void NetDb::Subscribe (const IdentHash& ident) |
|
{ |
|
LeaseSet * leaseSet = FindLeaseSet (ident); |
|
if (!leaseSet) |
|
{ |
|
LogPrint ("LeaseSet requested"); |
|
RequestDestination (ident, true); |
|
} |
|
m_Subscriptions.insert (ident); |
|
} |
|
|
|
void NetDb::Unsubscribe (const IdentHash& ident) |
|
{ |
|
m_Subscriptions.erase (ident); |
|
} |
|
|
|
void NetDb::ValidateSubscriptions () |
|
{ |
|
for (auto it : m_Subscriptions) |
|
{ |
|
LeaseSet * leaseSet = FindLeaseSet (it); |
|
if (!leaseSet || leaseSet->HasExpiredLeases ()) |
|
{ |
|
LogPrint ("LeaseSet re-requested"); |
|
RequestDestination (it, true); |
|
} |
|
} |
|
} |
|
} |
|
}
|
|
|