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Code Issues Releases Activity

parse data message

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orignal 2014-02-05 15:07:47 -05:00
parent 70cab34026
commit 53cd9c2418
2 changed files with 63 additions and 0 deletions
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61
SSU.cpp
View File

@ -47,6 +47,11 @@ namespace ssu
{
switch (m_State)
{
case eSessionStateEstablised:
// most common case
ProcessMessage (buf, len);
break;
// establishing
case eSessionStateUnknown:
// session request
ProcessSessionRequest (buf, len, senderEndpoint);
@ -64,6 +69,34 @@ namespace ssu
}
}
void SSUSession::ProcessMessage (uint8_t * buf, size_t len)
{
if (Validate (buf, len, m_MacKey))
{
Decrypt (buf, len, m_SessionKey);
SSUHeader * header = (SSUHeader *)buf;
uint8_t payloadType = header->flag >> 4;
switch (payloadType)
{
case PAYLOAD_TYPE_DATA:
LogPrint ("SSU data received");
ProcessData (buf + sizeof (SSUHeader), len - sizeof (SSUHeader));
break;
case PAYLOAD_TYPE_TEST:
LogPrint ("SSU test received");
break;
case PAYLOAD_TYPE_SESSION_DESTROY:
LogPrint ("SSU session destroy received");
break;
default:
LogPrint ("Unexpected SSU payload type ", (int)payloadType);
}
}
// TODO: try intro key as well
else
LogPrint ("MAC verifcation failed");
}
void SSUSession::ProcessSessionRequest (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint)
{
LogPrint ("Process session request");
@ -98,6 +131,7 @@ namespace ssu
LogPrint ("Our external address is ", ourIP.to_string (), ":", ourPort);
uint32_t relayTag = be32toh (*(uint32_t *)(buf + sizeof (SSUHeader) + 263));
SendSessionConfirmed (buf + sizeof (SSUHeader), ourAddress, relayTag);
m_State = eSessionStateEstablised;
}
}
@ -113,6 +147,7 @@ namespace ssu
m_State = eSessionStateConfirmedReceived;
LogPrint ("Session confirmed received");
// TODO:
m_State = eSessionStateEstablised;
}
else
LogPrint ("Unexpected payload type ", (int)(header->flag >> 4));
@ -327,6 +362,32 @@ namespace ssu
// TODO:
}
void SSUSession::ProcessData (uint8_t * buf, size_t len)
{
//uint8_t * start = buf;
uint8_t flag = *buf;
buf++;
LogPrint ("Process SSU data flags=", (int)flag);
if (flag)
{
//TODO: process options
return;
}
uint8_t numFragments = *buf; // number of fragments
buf++;
uint32_t msgID = be32toh (*(uint32_t *)buf); // message ID
buf += 4;
uint8_t frag[4];
frag[0] = 0;
memcpy (frag + 1, buf, 3);
buf += 3;
uint32_t fragmentInfo = be32toh (*(uint32_t *)frag); // fragment info
uint16_t fragmentSize = be16toh (fragmentInfo & 0x1FFF); // bits 0 - 13
bool isLast = fragmentInfo & 0x010000; // bit 16
uint8_t fragmentNum = fragmentInfo >> 17; // bits 23 - 17
LogPrint ("SSU data fragment ", (int)fragmentNum, " of ", (int)numFragments, " of message ", msgID, " size=", (int)fragmentSize, isLast ? " last" : " non-last");
}
SSUServer::SSUServer (boost::asio::io_service& service, int port):
m_Endpoint (boost::asio::ip::udp::v4 (), port), m_Socket (service, m_Endpoint)
{

2
SSU.h
View File

@ -65,12 +65,14 @@ namespace ssu
void CreateAESandMacKey (uint8_t * pubKey, uint8_t * aesKey, uint8_t * macKey);
void ProcessMessage (uint8_t * buf, size_t len); // call for established session
void ProcessSessionRequest (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
void SendSessionRequest ();
void ProcessSessionCreated (uint8_t * buf, size_t len);
void SendSessionCreated (const uint8_t * x);
void ProcessSessionConfirmed (uint8_t * buf, size_t len);
void SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress, uint32_t relayTag);
void ProcessData (uint8_t * buf, size_t len);
bool ProcessIntroKeyEncryptedMessage (uint8_t expectedPayloadType, i2p::data::RouterInfo& r, uint8_t * buf, size_t len);
void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len, uint8_t * aesKey, uint8_t * iv, uint8_t * macKey);