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i2pd
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introducer session

pull/64/head
orignal 11 years ago
parent
6d42cccadc
commit
31f906240e
2 changed files with 48 additions and 57 deletions
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  1. 89
      SSU.cpp
  2. 8
      SSU.h

89
SSU.cpp
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@ -75,15 +75,11 @@ namespace ssu @@ -75,15 +75,11 @@ namespace ssu
case eSessionRelayRequestSent:
// relay response
ProcessRelayResponse (buf,len);
m_Server.DeleteSession (this);
break;
case eSessionRelayResponseReceived:
case eSessionIntroduced:
// HolePunch received
LogPrint ("SSU HolePuch of ", len, " bytes received");
m_State = eSessionStateEstablished;
Established ();
break;
case eSessionRelayRequestReceived:
// HolePunch
m_State = eSessionStateUnknown;
Connect ();
break;
@ -151,7 +147,7 @@ namespace ssu @@ -151,7 +147,7 @@ namespace ssu
if (!Validate (buf, len, introKey))
{
LogPrint ("MAC verification intro key failed");
Failed ();
m_Server.DeleteSession (this);
return;
}
@ -273,7 +269,7 @@ namespace ssu @@ -273,7 +269,7 @@ namespace ssu
m_Server.Send (buf, 304, m_RemoteEndpoint);
}
void SSUSession::SendRelayRequest (const i2p::data::RouterInfo::Introducer& introducer)
void SSUSession::SendRelayRequest (uint32_t iTag, const uint8_t * iKey)
{
auto address = i2p::context.GetRouterInfo ().GetSSUAddress ();
if (!address)
@ -284,7 +280,7 @@ namespace ssu @@ -284,7 +280,7 @@ namespace ssu
uint8_t buf[96 + 18];
uint8_t * payload = buf + sizeof (SSUHeader);
*(uint32_t *)payload = htobe32 (introducer.iTag);
*(uint32_t *)payload = htobe32 (iTag);
payload += 4;
*payload = 0; // no address
payload++;
@ -299,7 +295,7 @@ namespace ssu @@ -299,7 +295,7 @@ namespace ssu
uint8_t iv[16];
rnd.GenerateBlock (iv, 16); // random iv
FillHeaderAndEncrypt (PAYLOAD_TYPE_RELAY_REQUEST, buf, 96, introducer.iKey, iv, introducer.iKey);
FillHeaderAndEncrypt (PAYLOAD_TYPE_RELAY_REQUEST, buf, 96, iKey, iv, iKey);
m_State = eSessionRelayRequestSent;
m_Server.Send (buf, 96, m_RemoteEndpoint);
}
@ -404,27 +400,22 @@ namespace ssu @@ -404,27 +400,22 @@ namespace ssu
{
Decrypt (buf, len, address->key);
SSUHeader * header = (SSUHeader *)buf;
if ((header->flag >> 4) == PAYLOAD_TYPE_RELAY_RESPONSE)
if (header->GetPayloadType () == PAYLOAD_TYPE_RELAY_RESPONSE)
{
LogPrint ("Relay response received");
m_State = eSessionRelayRequestReceived;
uint8_t * payload = buf + sizeof (SSUHeader);
payload++;
boost::asio::ip::address_v4 remoteIP (be32toh (*(uint32_t* )(payload)));
payload += 4;
uint16_t remotePort = be16toh (*(uint16_t *)(payload));
payload += 2;
boost::asio::ip::udp::endpoint newRemoteEndpoint(remoteIP, remotePort);
m_Server.ReassignSession (m_RemoteEndpoint, newRemoteEndpoint);
m_RemoteEndpoint = newRemoteEndpoint;
payload++;
payload++; // remote size
//boost::asio::ip::address_v4 remoteIP (be32toh (*(uint32_t* )(payload)));
payload += 4; // remote address
//uint16_t remotePort = be16toh (*(uint16_t *)(payload));
payload += 2; // remote port
payload++; // our size
boost::asio::ip::address_v4 ourIP (be32toh (*(uint32_t* )(payload)));
payload += 4;
payload += 4; // our address
uint16_t ourPort = be16toh (*(uint16_t *)(payload));
payload += 2;
payload += 2; // our port
LogPrint ("Our external address is ", ourIP.to_string (), ":", ourPort);
i2p::context.UpdateAddress (ourIP.to_string ().c_str ());
m_State= eSessionRelayResponseReceived;
}
else
LogPrint ("Unexpected payload type ", (int)(header->flag >> 4));
@ -524,7 +515,7 @@ namespace ssu @@ -524,7 +515,7 @@ namespace ssu
}
}
void SSUSession::ConnectThroughIntroducer (const i2p::data::RouterInfo::Introducer& introducer)
void SSUSession::Introduce (uint32_t iTag, const uint8_t * iKey)
{
if (m_State == eSessionStateUnknown)
{
@ -532,10 +523,19 @@ namespace ssu @@ -532,10 +523,19 @@ namespace ssu
m_Timer.expires_from_now (boost::posix_time::seconds(SSU_CONNECT_TIMEOUT));
m_Timer.async_wait (boost::bind (&SSUSession::HandleConnectTimer,
this, boost::asio::placeholders::error));
SendRelayRequest (introducer);
SendRelayRequest (iTag, iKey);
}
}
void SSUSession::WaitForIntroduction ()
{
m_State = eSessionIntroduced;
// set connect timer
m_Timer.expires_from_now (boost::posix_time::seconds(SSU_CONNECT_TIMEOUT));
m_Timer.async_wait (boost::bind (&SSUSession::HandleConnectTimer,
this, boost::asio::placeholders::error));
}
void SSUSession::Close ()
{
SendSesionDestroyed ();
@ -977,11 +977,12 @@ namespace ssu @@ -977,11 +977,12 @@ namespace ssu
else
{
// otherwise create new session
session = new SSUSession (*this, remoteEndpoint, router, peerTest);
m_Sessions[remoteEndpoint] = session;
if (!router->UsesIntroducer ())
{
// connect directly
session = new SSUSession (*this, remoteEndpoint, router, peerTest);
m_Sessions[remoteEndpoint] = session;
LogPrint ("Creating new SSU session to [", router->GetIdentHashAbbreviation (), "] ",
remoteEndpoint.address ().to_string (), ":", remoteEndpoint.port ());
session->Connect ();
@ -989,24 +990,27 @@ namespace ssu @@ -989,24 +990,27 @@ namespace ssu
else
{
// connect through introducer
session->WaitForIntroduction ();
if (address->introducers.size () > 0)
{
auto& introducer = address->introducers[0]; // TODO:
boost::asio::ip::udp::endpoint introducerEndpoint (introducer.iHost, introducer.iPort);
it = m_Sessions.find (introducerEndpoint);
if (it == m_Sessions.end ())
{
session = new SSUSession (*this, introducerEndpoint, router);
m_Sessions[introducerEndpoint] = session;
LogPrint ("Creating new SSU session to [", router->GetIdentHashAbbreviation (),
"] through introducer ", introducerEndpoint.address ().to_string (), ":", introducerEndpoint.port ());
session->ConnectThroughIntroducer (introducer);
it = m_Sessions.find (introducerEndpoint);
SSUSession * introducerSession = nullptr;
if (it != m_Sessions.end ())
{
LogPrint ("Session to introducer already exists");
introducerSession = it->second;
}
else
{
LogPrint ("Session to introducer already exists");
// TODO:
LogPrint ("New session to introducer created");
introducerSession = new SSUSession (*this, introducerEndpoint, router);
m_Sessions[introducerEndpoint] = introducerSession;
}
introducerSession->Introduce (introducer.iTag, introducer.iKey);
}
else
LogPrint ("Router is unreachable, but not introducers presentd. Ignored");
@ -1038,19 +1042,6 @@ namespace ssu @@ -1038,19 +1042,6 @@ namespace ssu
}
m_Sessions.clear ();
}
void SSUServer::ReassignSession (const boost::asio::ip::udp::endpoint& oldEndpoint, const boost::asio::ip::udp::endpoint& newEndpoint)
{
auto it = m_Sessions.find (oldEndpoint);
if (it != m_Sessions.end ())
{
auto session = it->second;
m_Sessions.erase (it);
m_Sessions[newEndpoint] = session;
LogPrint ("SSU session reassigned from ", oldEndpoint.address ().to_string (), ":", oldEndpoint.port (),
" to ", newEndpoint.address ().to_string (), ":", newEndpoint.port ());
}
}
}
}

8
SSU.h
Unescape View File

@ -62,7 +62,7 @@ namespace ssu @@ -62,7 +62,7 @@ namespace ssu
eSessionStateConfirmedReceived,
eSessionRelayRequestSent,
eSessionRelayRequestReceived,
eSessionRelayResponseReceived,
eSessionIntroduced,
eSessionStateEstablished,
eSessionStateFailed
};
@ -78,7 +78,8 @@ namespace ssu @@ -78,7 +78,8 @@ namespace ssu
~SSUSession ();
void Connect ();
void ConnectThroughIntroducer (const i2p::data::RouterInfo::Introducer& introducer);
void Introduce (uint32_t iTag, const uint8_t * iKey);
void WaitForIntroduction ();
void Close ();
boost::asio::ip::udp::endpoint& GetRemoteEndpoint () { return m_RemoteEndpoint; };
const i2p::data::RouterInfo * GetRemoteRouter () const { return m_RemoteRouter; };
@ -94,7 +95,7 @@ namespace ssu @@ -94,7 +95,7 @@ namespace ssu
void ProcessSessionRequest (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
void SendSessionRequest ();
void SendRelayRequest (const i2p::data::RouterInfo::Introducer& introducer);
void SendRelayRequest (uint32_t iTag, const uint8_t * iKey);
void ProcessSessionCreated (uint8_t * buf, size_t len);
void SendSessionCreated (const uint8_t * x);
void ProcessSessionConfirmed (uint8_t * buf, size_t len);
@ -153,7 +154,6 @@ namespace ssu @@ -153,7 +154,6 @@ namespace ssu
boost::asio::io_service& GetService () { return m_Socket.get_io_service(); };
const boost::asio::ip::udp::endpoint& GetEndpoint () const { return m_Endpoint; };
void Send (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& to);
void ReassignSession (const boost::asio::ip::udp::endpoint& oldEndpoint, const boost::asio::ip::udp::endpoint& newEndpoint);
private:

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