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@ -65,6 +65,15 @@ namespace ssu
@@ -65,6 +65,15 @@ namespace ssu
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// session confirmed
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ProcessSessionConfirmed (buf, len); |
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break; |
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case eSessionRelayRequestSent: |
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// relay response
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ProcessRelayResponse (buf,len); |
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break; |
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case eSessionRelayRequestReceived: |
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// HolePunch
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m_State = eSessionStateUnknown; |
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Connect (); |
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break; |
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default: |
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LogPrint ("SSU state not implemented yet"); |
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} |
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@ -91,7 +100,11 @@ namespace ssu
@@ -91,7 +100,11 @@ namespace ssu
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LogPrint ("SSU session destroy received"); |
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if (m_Server) |
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m_Server->DeleteSession (this); // delete this
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break; |
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} |
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case PAYLOAD_TYPE_RELAY_INTRO: |
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LogPrint ("SSU relay intro received"); |
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// TODO:
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break; |
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default: |
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LogPrint ("Unexpected SSU payload type ", (int)payloadType); |
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@ -197,6 +210,37 @@ namespace ssu
@@ -197,6 +210,37 @@ namespace ssu
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m_Server->Send (buf, 304, m_RemoteEndpoint); |
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} |
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void SSUSession::SendRelayRequest (const i2p::data::RouterInfo::Introducer& introducer) |
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{ |
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auto address = i2p::context.GetRouterInfo ().GetSSUAddress (); |
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if (!address) |
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{ |
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LogPrint ("SSU is not supported"); |
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return; |
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} |
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uint8_t buf[96 + 18]; |
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uint8_t * payload = buf + sizeof (SSUHeader); |
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*(uint32_t *)payload = htobe32 (introducer.iTag); |
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payload += 4; |
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*payload = 0; // no address
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payload++; |
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*(uint16_t *)payload = 0; // port = 0
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payload += 2; |
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*payload = 0; // challenge
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payload++; |
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memcpy (payload, address->key, 32); |
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payload += 32; |
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CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator (); |
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*(uint32_t *)payload = htobe32 (rnd.GenerateWord32 ()); // nonce
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uint8_t iv[16]; |
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rnd.GenerateBlock (iv, 16); // random iv
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FillHeaderAndEncrypt (PAYLOAD_TYPE_RELAY_REQUEST, buf, 96, introducer.iKey, iv, introducer.iKey); |
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m_State = eSessionRelayRequestSent; |
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m_Server->Send (buf, 96, m_RemoteEndpoint); |
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} |
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void SSUSession::SendSessionCreated (const uint8_t * x) |
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{ |
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auto introKey = GetIntroKey (); |
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@ -282,6 +326,46 @@ namespace ssu
@@ -282,6 +326,46 @@ namespace ssu
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m_Server->Send (buf, 480, m_RemoteEndpoint); |
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} |
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void SSUSession::ProcessRelayResponse (uint8_t * buf, size_t len) |
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{ |
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LogPrint ("Process relay response"); |
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auto address = i2p::context.GetRouterInfo ().GetSSUAddress (); |
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if (!address) |
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{ |
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LogPrint ("SSU is not supported"); |
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return; |
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} |
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if (Validate (buf, len, address->key)) |
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{ |
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Decrypt (buf, len, address->key); |
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SSUHeader * header = (SSUHeader *)buf; |
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if ((header->flag >> 4) == PAYLOAD_TYPE_RELAY_RESPONSE) |
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{ |
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LogPrint ("Relay response received"); |
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m_State = eSessionRelayRequestReceived; |
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uint8_t * payload = buf + sizeof (SSUHeader); |
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payload++; |
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boost::asio::ip::address_v4 remoteIP (be32toh (*(uint32_t* )(payload))); |
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payload += 4; |
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uint16_t remotePort = be16toh (*(uint16_t *)(payload)); |
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payload += 2; |
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boost::asio::ip::udp::endpoint newRemoteEndpoint(remoteIP, remotePort); |
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m_Server->ReassignSession (m_RemoteEndpoint, newRemoteEndpoint); |
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m_RemoteEndpoint = newRemoteEndpoint; |
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payload++; |
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boost::asio::ip::address_v4 ourIP (be32toh (*(uint32_t* )(payload))); |
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payload += 4; |
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uint16_t ourPort = be16toh (*(uint16_t *)(payload)); |
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payload += 2; |
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LogPrint ("Our external address is ", ourIP.to_string (), ":", ourPort); |
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i2p::context.UpdateAddress (ourIP.to_string ().c_str ()); |
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} |
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else |
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LogPrint ("Unexpected payload type ", (int)(header->flag >> 4)); |
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} |
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} |
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bool SSUSession::ProcessIntroKeyEncryptedMessage (uint8_t expectedPayloadType, uint8_t * buf, size_t len) |
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{ |
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auto introKey = GetIntroKey (); |
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@ -301,7 +385,7 @@ namespace ssu
@@ -301,7 +385,7 @@ namespace ssu
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LogPrint ("Unexpected payload type ", (int)(header->flag >> 4)); |
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} |
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else |
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LogPrint ("MAC verifcation failed"); |
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LogPrint ("MAC verification failed"); |
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} |
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else |
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LogPrint ("SSU is not supported"); |
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@ -368,6 +452,11 @@ namespace ssu
@@ -368,6 +452,11 @@ namespace ssu
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SendSessionRequest (); |
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} |
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void SSUSession::ConnectThroughIntroducer (const i2p::data::RouterInfo::Introducer& introducer) |
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{ |
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SendRelayRequest (introducer); |
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} |
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void SSUSession::Close () |
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{ |
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SendSesionDestroyed (); |
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@ -678,11 +767,26 @@ namespace ssu
@@ -678,11 +767,26 @@ namespace ssu
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else |
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{ |
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// otherwise create new session
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session = new SSUSession (this, remoteEndpoint, router); |
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m_Sessions[remoteEndpoint] = session; |
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LogPrint ("New SSU session to [", router->GetIdentHashAbbreviation (), "] ", |
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remoteEndpoint.address ().to_string (), ":", remoteEndpoint.port (), " created"); |
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session->Connect (); |
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if (!router->UsesIntroducer ()) |
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{ |
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// connect directly
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session = new SSUSession (this, remoteEndpoint, router); |
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m_Sessions[remoteEndpoint] = session; |
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LogPrint ("New SSU session to [", router->GetIdentHashAbbreviation (), "] ", |
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remoteEndpoint.address ().to_string (), ":", remoteEndpoint.port (), " created"); |
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session->Connect (); |
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} |
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else |
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{ |
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// connect to introducer
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auto& introducer = address->introducers[0]; // TODO:
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boost::asio::ip::udp::endpoint introducerEndpoint (introducer.iHost, introducer.iPort); |
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session = new SSUSession (this, introducerEndpoint, router); |
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m_Sessions[introducerEndpoint] = session; |
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LogPrint ("New SSU session to [", router->GetIdentHashAbbreviation (), |
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"] created through introducer ", introducerEndpoint.address ().to_string (), ":", introducerEndpoint.port ()); |
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session->ConnectThroughIntroducer (introducer); |
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} |
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} |
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} |
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else |
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@ -710,6 +814,18 @@ namespace ssu
@@ -710,6 +814,18 @@ namespace ssu
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} |
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m_Sessions.clear (); |
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} |
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void SSUServer::ReassignSession (const boost::asio::ip::udp::endpoint& oldEndpoint, const boost::asio::ip::udp::endpoint& newEndpoint) |
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{ |
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auto it = m_Sessions.find (oldEndpoint); |
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if (it != m_Sessions.end ()) |
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{ |
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m_Sessions.erase (it); |
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m_Sessions[newEndpoint] = it->second; |
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LogPrint ("SSU session ressigned from ", oldEndpoint.address ().to_string (), ":", oldEndpoint.port (), |
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" to ", newEndpoint.address ().to_string (), ":", newEndpoint.port ()); |
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} |
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} |
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} |
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} |
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Meeh
11 years ago