mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
336 lines
11 KiB
336 lines
11 KiB
#include <string.h> |
|
#include <vector> |
|
#include "Crypto.h" |
|
#include "Log.h" |
|
#include "TunnelBase.h" |
|
#include "RouterContext.h" |
|
#include "Destination.h" |
|
#include "Datagram.h" |
|
|
|
namespace i2p |
|
{ |
|
namespace datagram |
|
{ |
|
DatagramDestination::DatagramDestination (std::shared_ptr<i2p::client::ClientDestination> owner): |
|
m_Owner (owner.get()), |
|
m_Receiver (nullptr) |
|
{ |
|
m_Identity.FromBase64 (owner->GetIdentity()->ToBase64()); |
|
} |
|
|
|
DatagramDestination::~DatagramDestination () |
|
{ |
|
m_Sessions.clear(); |
|
} |
|
|
|
void DatagramDestination::SendDatagramTo(const uint8_t * payload, size_t len, const i2p::data::IdentHash & identity, uint16_t fromPort, uint16_t toPort) |
|
{ |
|
auto owner = m_Owner; |
|
std::vector<uint8_t> v(MAX_DATAGRAM_SIZE); |
|
uint8_t * buf = v.data(); |
|
auto identityLen = m_Identity.ToBuffer (buf, MAX_DATAGRAM_SIZE); |
|
uint8_t * signature = buf + identityLen; |
|
auto signatureLen = m_Identity.GetSignatureLen (); |
|
uint8_t * buf1 = signature + signatureLen; |
|
size_t headerLen = identityLen + signatureLen; |
|
|
|
memcpy (buf1, payload, len); |
|
if (m_Identity.GetSigningKeyType () == i2p::data::SIGNING_KEY_TYPE_DSA_SHA1) |
|
{ |
|
uint8_t hash[32]; |
|
SHA256(buf1, len, hash); |
|
owner->Sign (hash, 32, signature); |
|
} |
|
else |
|
owner->Sign (buf1, len, signature); |
|
|
|
auto msg = CreateDataMessage (buf, len + headerLen, fromPort, toPort); |
|
ObtainSession(identity)->SendMsg(msg); |
|
} |
|
|
|
|
|
void DatagramDestination::HandleDatagram (uint16_t fromPort, uint16_t toPort,uint8_t * const &buf, size_t len) |
|
{ |
|
i2p::data::IdentityEx identity; |
|
size_t identityLen = identity.FromBuffer (buf, len); |
|
const uint8_t * signature = buf + identityLen; |
|
size_t headerLen = identityLen + identity.GetSignatureLen (); |
|
|
|
bool verified = false; |
|
if (identity.GetSigningKeyType () == i2p::data::SIGNING_KEY_TYPE_DSA_SHA1) |
|
{ |
|
uint8_t hash[32]; |
|
SHA256(buf + headerLen, len - headerLen, hash); |
|
verified = identity.Verify (hash, 32, signature); |
|
} |
|
else |
|
verified = identity.Verify (buf + headerLen, len - headerLen, signature); |
|
|
|
if (verified) |
|
{ |
|
auto h = identity.GetIdentHash(); |
|
ObtainSession(h)->Ack(); |
|
auto r = FindReceiver(toPort); |
|
if(r) |
|
r(identity, fromPort, toPort, buf + headerLen, len -headerLen); |
|
else |
|
LogPrint (eLogWarning, "DatagramDestination: no receiver for port ", toPort); |
|
} |
|
else |
|
LogPrint (eLogWarning, "Datagram signature verification failed"); |
|
} |
|
|
|
DatagramDestination::Receiver DatagramDestination::FindReceiver(uint16_t port) |
|
{ |
|
std::lock_guard<std::mutex> lock(m_ReceiversMutex); |
|
Receiver r = m_Receiver; |
|
auto itr = m_ReceiversByPorts.find(port); |
|
if (itr != m_ReceiversByPorts.end()) |
|
r = itr->second; |
|
return r; |
|
} |
|
|
|
void DatagramDestination::HandleDataMessagePayload (uint16_t fromPort, uint16_t toPort, const uint8_t * buf, size_t len) |
|
{ |
|
// unzip it |
|
uint8_t uncompressed[MAX_DATAGRAM_SIZE]; |
|
size_t uncompressedLen = m_Inflator.Inflate (buf, len, uncompressed, MAX_DATAGRAM_SIZE); |
|
if (uncompressedLen) |
|
HandleDatagram (fromPort, toPort, uncompressed, uncompressedLen); |
|
} |
|
|
|
std::shared_ptr<I2NPMessage> DatagramDestination::CreateDataMessage (const uint8_t * payload, size_t len, uint16_t fromPort, uint16_t toPort) |
|
{ |
|
auto msg = NewI2NPMessage (); |
|
uint8_t * buf = msg->GetPayload (); |
|
buf += 4; // reserve for length |
|
size_t size = m_Deflator.Deflate (payload, len, buf, msg->maxLen - msg->len); |
|
if (size) |
|
{ |
|
htobe32buf (msg->GetPayload (), size); // length |
|
htobe16buf (buf + 4, fromPort); // source port |
|
htobe16buf (buf + 6, toPort); // destination port |
|
buf[9] = i2p::client::PROTOCOL_TYPE_DATAGRAM; // datagram protocol |
|
msg->len += size + 4; |
|
msg->FillI2NPMessageHeader (eI2NPData); |
|
} |
|
else |
|
msg = nullptr; |
|
return msg; |
|
} |
|
|
|
void DatagramDestination::CleanUp () |
|
{ |
|
if (m_Sessions.empty ()) return; |
|
auto now = i2p::util::GetMillisecondsSinceEpoch(); |
|
LogPrint(eLogDebug, "DatagramDestination: clean up sessions"); |
|
std::unique_lock<std::mutex> lock(m_SessionsMutex); |
|
// for each session ... |
|
for (auto it = m_Sessions.begin (); it != m_Sessions.end (); ) |
|
{ |
|
// check if expired |
|
if (now - it->second->LastActivity() >= DATAGRAM_SESSION_MAX_IDLE) |
|
{ |
|
LogPrint(eLogInfo, "DatagramDestination: expiring idle session with ", it->first.ToBase32()); |
|
it = m_Sessions.erase (it); // we are expired |
|
} |
|
else |
|
it++; |
|
} |
|
} |
|
|
|
std::shared_ptr<DatagramSession> DatagramDestination::ObtainSession(const i2p::data::IdentHash & identity) |
|
{ |
|
std::shared_ptr<DatagramSession> session = nullptr; |
|
std::lock_guard<std::mutex> lock(m_SessionsMutex); |
|
auto itr = m_Sessions.find(identity); |
|
if (itr == m_Sessions.end()) { |
|
// not found, create new session |
|
session = std::make_shared<DatagramSession>(m_Owner, identity); |
|
m_Sessions[identity] = session; |
|
} else { |
|
session = itr->second; |
|
} |
|
return session; |
|
} |
|
|
|
std::shared_ptr<DatagramSession::Info> DatagramDestination::GetInfoForRemote(const i2p::data::IdentHash & remote) |
|
{ |
|
std::lock_guard<std::mutex> lock(m_SessionsMutex); |
|
for ( auto & item : m_Sessions) |
|
{ |
|
if(item.first == remote) return std::make_shared<DatagramSession::Info>(item.second->GetSessionInfo()); |
|
} |
|
return nullptr; |
|
} |
|
|
|
DatagramSession::DatagramSession(i2p::client::ClientDestination * localDestination, |
|
const i2p::data::IdentHash & remoteIdent) : |
|
m_LocalDestination(localDestination), |
|
m_RemoteIdent(remoteIdent), |
|
m_SendQueueTimer(localDestination->GetService()) |
|
{ |
|
m_LastUse = i2p::util::GetMillisecondsSinceEpoch (); |
|
ScheduleFlushSendQueue(); |
|
} |
|
|
|
void DatagramSession::SendMsg(std::shared_ptr<I2NPMessage> msg) |
|
{ |
|
// we used this session |
|
m_LastUse = i2p::util::GetMillisecondsSinceEpoch(); |
|
// schedule send |
|
m_LocalDestination->GetService().post(std::bind(&DatagramSession::HandleSend, this, msg)); |
|
} |
|
|
|
DatagramSession::Info DatagramSession::GetSessionInfo() const |
|
{ |
|
if(!m_RoutingSession) |
|
return DatagramSession::Info(nullptr, nullptr, m_LastUse); |
|
|
|
auto routingPath = m_RoutingSession->GetSharedRoutingPath(); |
|
if (!routingPath) |
|
return DatagramSession::Info(nullptr, nullptr, m_LastUse); |
|
auto lease = routingPath->remoteLease; |
|
auto tunnel = routingPath->outboundTunnel; |
|
if(lease) |
|
{ |
|
if(tunnel) |
|
return DatagramSession::Info(lease->tunnelGateway, tunnel->GetEndpointIdentHash(), m_LastUse); |
|
else |
|
return DatagramSession::Info(lease->tunnelGateway, nullptr, m_LastUse); |
|
} |
|
else if(tunnel) |
|
return DatagramSession::Info(nullptr, tunnel->GetEndpointIdentHash(), m_LastUse); |
|
else |
|
return DatagramSession::Info(nullptr, nullptr, m_LastUse); |
|
} |
|
|
|
void DatagramSession::Ack() |
|
{ |
|
m_LastUse = i2p::util::GetMillisecondsSinceEpoch(); |
|
auto path = GetSharedRoutingPath(); |
|
if(path) |
|
path->updateTime = i2p::util::GetSecondsSinceEpoch (); |
|
} |
|
|
|
std::shared_ptr<i2p::garlic::GarlicRoutingPath> DatagramSession::GetSharedRoutingPath () |
|
{ |
|
if(!m_RoutingSession) { |
|
if(!m_RemoteLeaseSet) { |
|
m_RemoteLeaseSet = m_LocalDestination->FindLeaseSet(m_RemoteIdent); |
|
} |
|
if(!m_RemoteLeaseSet) { |
|
// no remote lease set |
|
m_LocalDestination->RequestDestination(m_RemoteIdent, std::bind(&DatagramSession::HandleLeaseSetUpdated, this, std::placeholders::_1)); |
|
return nullptr; |
|
} |
|
m_RoutingSession = m_LocalDestination->GetRoutingSession(m_RemoteLeaseSet, true); |
|
} |
|
auto path = m_RoutingSession->GetSharedRoutingPath(); |
|
if(path) { |
|
if (m_CurrentOutboundTunnel && !m_CurrentOutboundTunnel->IsEstablished()) { |
|
// bad outbound tunnel, switch outbound tunnel |
|
m_CurrentOutboundTunnel = m_LocalDestination->GetTunnelPool()->GetNextOutboundTunnel(m_CurrentOutboundTunnel); |
|
path->outboundTunnel = m_CurrentOutboundTunnel; |
|
} |
|
if(m_CurrentRemoteLease && ! m_CurrentRemoteLease->ExpiresWithin(DATAGRAM_SESSION_LEASE_HANDOVER_WINDOW)) { |
|
// bad lease, switch to next one |
|
if(m_RemoteLeaseSet) { |
|
auto ls = m_RemoteLeaseSet->GetNonExpiredLeasesExcluding([&](const i2p::data::Lease& l) -> bool { |
|
return l.tunnelGateway == m_CurrentRemoteLease->tunnelGateway || l.endDate <= m_CurrentRemoteLease->endDate; |
|
}); |
|
auto sz = ls.size(); |
|
if (sz) { |
|
auto idx = rand() % sz; |
|
m_CurrentRemoteLease = ls[idx]; |
|
} else { |
|
// no more leases, bail |
|
LogPrint(eLogWarning, "DatagramSession: no more valid remote leases to ", m_RemoteIdent.ToBase32()); |
|
} |
|
} else { |
|
// no remote lease set? |
|
LogPrint(eLogWarning, "DatagramSession: no cached remote lease set for ", m_RemoteIdent.ToBase32()); |
|
} |
|
path->remoteLease = m_CurrentRemoteLease; |
|
} |
|
} else { |
|
// no current path, make one |
|
path = std::make_shared<i2p::garlic::GarlicRoutingPath>(); |
|
// switch outbound tunnel if bad |
|
if(m_CurrentOutboundTunnel == nullptr || ! m_CurrentOutboundTunnel->IsEstablished()) { |
|
m_CurrentOutboundTunnel = m_LocalDestination->GetTunnelPool()->GetNextOutboundTunnel(m_CurrentOutboundTunnel); |
|
} |
|
// switch lease if bad |
|
if(m_CurrentRemoteLease == nullptr || m_CurrentRemoteLease->ExpiresWithin(DATAGRAM_SESSION_LEASE_HANDOVER_WINDOW)) { |
|
if(!m_RemoteLeaseSet) { |
|
m_RemoteLeaseSet = m_LocalDestination->FindLeaseSet(m_RemoteIdent); |
|
} |
|
if(m_RemoteLeaseSet) { |
|
// pick random next good lease |
|
auto ls = m_RemoteLeaseSet->GetNonExpiredLeasesExcluding([&] (const i2p::data::Lease & l) -> bool { |
|
if(m_CurrentRemoteLease) |
|
return l.tunnelGateway == m_CurrentRemoteLease->tunnelGateway; |
|
return false; |
|
}); |
|
auto sz = ls.size(); |
|
if(sz) { |
|
auto idx = rand() % sz; |
|
m_CurrentRemoteLease = ls[idx]; |
|
} |
|
} else { |
|
// no remote lease set currently, bail |
|
LogPrint(eLogWarning, "DatagramSession: no remote lease set found for ", m_RemoteIdent.ToBase32()); |
|
return nullptr; |
|
} |
|
} |
|
path->outboundTunnel = m_CurrentOutboundTunnel; |
|
path->remoteLease = m_CurrentRemoteLease; |
|
m_RoutingSession->SetSharedRoutingPath(path); |
|
} |
|
return path; |
|
|
|
} |
|
|
|
void DatagramSession::HandleLeaseSetUpdated(std::shared_ptr<i2p::data::LeaseSet> ls) |
|
{ |
|
// only update lease set if found and newer than previous lease set |
|
uint64_t oldExpire = 0; |
|
if(m_RemoteLeaseSet) oldExpire = m_RemoteLeaseSet->GetExpirationTime(); |
|
if(ls && ls->GetExpirationTime() > oldExpire) m_RemoteLeaseSet = ls; |
|
} |
|
|
|
void DatagramSession::HandleSend(std::shared_ptr<I2NPMessage> msg) |
|
{ |
|
m_SendQueue.push_back(msg); |
|
// flush queue right away if full |
|
if(m_SendQueue.size() >= DATAGRAM_SEND_QUEUE_MAX_SIZE) FlushSendQueue(); |
|
} |
|
|
|
void DatagramSession::FlushSendQueue () |
|
{ |
|
|
|
std::vector<i2p::tunnel::TunnelMessageBlock> send; |
|
auto routingPath = GetSharedRoutingPath(); |
|
// if we don't have a routing path we will drop all queued messages |
|
if(routingPath) |
|
{ |
|
for (const auto & msg : m_SendQueue) |
|
{ |
|
auto m = m_RoutingSession->WrapSingleMessage(msg); |
|
send.push_back(i2p::tunnel::TunnelMessageBlock{i2p::tunnel::eDeliveryTypeTunnel,routingPath->remoteLease->tunnelGateway, routingPath->remoteLease->tunnelID, m}); |
|
} |
|
routingPath->outboundTunnel->SendTunnelDataMsg(send); |
|
} |
|
m_SendQueue.clear(); |
|
ScheduleFlushSendQueue(); |
|
} |
|
|
|
void DatagramSession::ScheduleFlushSendQueue() |
|
{ |
|
boost::posix_time::milliseconds dlt(100); |
|
m_SendQueueTimer.expires_from_now(dlt); |
|
m_SendQueueTimer.async_wait([&](const boost::system::error_code & ec) { if(ec) return; FlushSendQueue(); }); |
|
} |
|
} |
|
} |
|
|
|
|