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handle PeerTest msg 1

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orignal 2022-06-09 18:04:37 -04:00
parent 0640bec026
commit 2e4d8cdc8b
4 changed files with 78 additions and 10 deletions
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25
libi2pd/SSU2.cpp
View File

@ -245,6 +245,31 @@ namespace transport
return nullptr;
}
std::shared_ptr<SSU2Session> SSU2Server::GetRandomSession (i2p::data::RouterInfo::CompatibleTransports remoteTransports) const
{
if (m_Sessions.empty ()) return nullptr;
uint16_t ind;
RAND_bytes ((uint8_t *)&ind, sizeof (ind));
ind %= m_Sessions.size ();
auto it = m_Sessions.begin ();
std::advance (it, ind);
while (it != m_Sessions.end ())
{
if (it->second->GetRemoteTransports () & remoteTransports)
return it->second;
it++;
}
// not found, try from begining
it = m_Sessions.begin ();
while (it != m_Sessions.end () && ind)
{
if (it->second->GetRemoteTransports () & remoteTransports)
return it->second;
it++; ind--;
}
return nullptr;
}
void SSU2Server::AddRelay (uint32_t tag, std::shared_ptr<SSU2Session> relay)
{
m_Relays.emplace (tag, relay);

1
libi2pd/SSU2.h
View File

@ -54,6 +54,7 @@ namespace transport
void AddSessionByRouterHash (std::shared_ptr<SSU2Session> session);
void AddPendingOutgoingSession (std::shared_ptr<SSU2Session> session);
std::shared_ptr<SSU2Session> FindSession (const i2p::data::IdentHash& ident) const;
std::shared_ptr<SSU2Session> GetRandomSession (i2p::data::RouterInfo::CompatibleTransports remoteTransports) const;
void AddRelay (uint32_t tag, std::shared_ptr<SSU2Session> relay);
void RemoveRelay (uint32_t tag);

50
libi2pd/SSU2Session.cpp
View File

@ -22,9 +22,10 @@ namespace transport
SSU2Session::SSU2Session (SSU2Server& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter,
std::shared_ptr<const i2p::data::RouterInfo::Address> addr):
TransportSession (in_RemoteRouter, SSU2_CONNECT_TIMEOUT),
m_Server (server), m_Address (addr), m_DestConnID (0), m_SourceConnID (0),
m_State (eSSU2SessionStateUnknown), m_SendPacketNum (0), m_ReceivePacketNum (0),
m_IsDataReceived (false), m_WindowSize (SSU2_MAX_WINDOW_SIZE), m_RelayTag (0)
m_Server (server), m_Address (addr), m_RemoteTransports (0),
m_DestConnID (0), m_SourceConnID (0), m_State (eSSU2SessionStateUnknown),
m_SendPacketNum (0), m_ReceivePacketNum (0), m_IsDataReceived (false),
m_WindowSize (SSU2_MAX_WINDOW_SIZE), m_RelayTag (0)
{
m_NoiseState.reset (new i2p::crypto::NoiseSymmetricState);
if (in_RemoteRouter && m_Address)
@ -32,6 +33,7 @@ namespace transport
// outgoing
InitNoiseXKState1 (*m_NoiseState, m_Address->s);
m_RemoteEndpoint = boost::asio::ip::udp::endpoint (m_Address->host, m_Address->port);
m_RemoteTransports = in_RemoteRouter->GetCompatibleTransports (false);
RAND_bytes ((uint8_t *)&m_DestConnID, 8);
RAND_bytes ((uint8_t *)&m_SourceConnID, 8);
}
@ -612,6 +614,7 @@ namespace transport
LogPrint (eLogError, "SSU2: No SSU2 address with static key found in SessionConfirmed");
return false;
}
m_RemoteTransports = ri->GetCompatibleTransports (false);
i2p::data::netdb.PostI2NPMsg (CreateI2NPMessage (eI2NPDummyMsg, ri->GetBuffer (), ri->GetBufferLen ())); // TODO: should insert ri
// handle other blocks
HandlePayload (decryptedPayload.data () + riSize + 3, decryptedPayload.size () - riSize - 3);
@ -1333,12 +1336,37 @@ namespace transport
{
case 1: // Bob from Alice
{
// TODO: find Charlie
auto session = m_Server.GetRandomSession ((buf[12] == 6) ? i2p::data::RouterInfo::eSSU2V4 : i2p::data::RouterInfo::eSSU2V6);
if (session) // session with Charlie
{
session->m_PeerTests.emplace (nonce, std::make_pair (shared_from_this (), i2p::util::GetSecondsSinceEpoch ()));
uint8_t payload[SSU2_MAX_PAYLOAD_SIZE];
// Alice's RouterInfo
auto r = i2p::data::netdb.FindRouter (GetRemoteIdentity ()->GetIdentHash ());
size_t payloadSize = r ? CreateRouterInfoBlock (payload, SSU2_MAX_PAYLOAD_SIZE - len - 32, r) : 0;
if (!payloadSize && r)
session->SendFragmentedMessage (CreateDatabaseStoreMsg (r));
if (payloadSize + len + 48 > SSU2_MAX_PAYLOAD_SIZE)
{
// doesn't fit one message, send RouterInfo in separate message
session->SendData (payload, payloadSize);
payloadSize = 0;
}
// PeerTest to Charlie
payloadSize += CreatePeerTestBlock (payload, SSU2_MAX_PAYLOAD_SIZE - payloadSize, 2,
eSSU2PeerTestCodeAccept, GetRemoteIdentity ()->GetIdentHash (), buf + 3, len - 3);
payloadSize += CreatePaddingBlock (payload + payloadSize, SSU2_MAX_PAYLOAD_SIZE - payloadSize);
session->SendData (payload, payloadSize);
}
else
{
// Charlie not found, send error back to Alice
uint8_t payload[SSU2_MAX_PAYLOAD_SIZE], zeroHash[32] = {0};
size_t payloadSize = CreatePeerTestBlock (payload, SSU2_MAX_PAYLOAD_SIZE, 4,
eSSU2PeerTestCodeBobNoCharlieAvailable, zeroHash, buf + 3, len - 3);
payloadSize += CreatePaddingBlock (payload + payloadSize, SSU2_MAX_PAYLOAD_SIZE - payloadSize);
SendData (payload, payloadSize);
}
break;
}
case 2: // Charlie from Bob
@ -1401,7 +1429,19 @@ namespace transport
if (it != m_PeerTests.end () && it->second.first)
{
uint8_t payload[SSU2_MAX_PAYLOAD_SIZE];
size_t payloadSize = CreatePeerTestBlock (payload, SSU2_MAX_PAYLOAD_SIZE, 4,
// Charlie's RouterInfo
auto r = i2p::data::netdb.FindRouter (GetRemoteIdentity ()->GetIdentHash ());
size_t payloadSize = r ? CreateRouterInfoBlock (payload, SSU2_MAX_PAYLOAD_SIZE - len - 32, r) : 0;
if (!payloadSize && r)
it->second.first->SendFragmentedMessage (CreateDatabaseStoreMsg (r));
if (payloadSize + len + 16 > SSU2_MAX_PAYLOAD_SIZE)
{
// doesn't fit one message, send RouterInfo in separate message
it->second.first->SendData (payload, payloadSize);
payloadSize = 0;
}
// PeerTest to Alice
payloadSize = CreatePeerTestBlock (payload, SSU2_MAX_PAYLOAD_SIZE, 4,
(SSU2PeerTestCode)buf[1], GetRemoteIdentity ()->GetIdentHash (), buf + 3, len - 3);
if (payloadSize < SSU2_MAX_PAYLOAD_SIZE)
payloadSize += CreatePaddingBlock (payload + payloadSize, SSU2_MAX_PAYLOAD_SIZE - payloadSize);

2
libi2pd/SSU2Session.h
View File

@ -160,6 +160,7 @@ namespace transport
void SetRemoteEndpoint (const boost::asio::ip::udp::endpoint& ep) { m_RemoteEndpoint = ep; };
const boost::asio::ip::udp::endpoint& GetRemoteEndpoint () const { return m_RemoteEndpoint; };
i2p::data::RouterInfo::CompatibleTransports GetRemoteTransports () const { return m_RemoteTransports; };
void SetOnEstablished (OnEstablished e) { m_OnEstablished = e; };
void Connect ();
@ -244,6 +245,7 @@ namespace transport
std::unique_ptr<SessionConfirmedFragment> m_SessionConfirmedFragment1; // for Bob if applicable
std::shared_ptr<const i2p::data::RouterInfo::Address> m_Address;
boost::asio::ip::udp::endpoint m_RemoteEndpoint;
i2p::data::RouterInfo::CompatibleTransports m_RemoteTransports; // for peer tests
uint64_t m_DestConnID, m_SourceConnID;
SSU2SessionState m_State;
uint8_t m_KeyDataSend[64], m_KeyDataReceive[64];