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Code Issues Releases Activity

send ack

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orignal 2014-02-07 15:47:10 -05:00
parent 656392fe1e
commit 1c1103dcce
2 changed files with 30 additions and 1 deletions
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22
SSU.cpp
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@ -382,7 +382,7 @@ namespace ssu
uint16_t fragmentSize = fragmentInfo & 0x1FFF; // bits 0 - 13 uint16_t fragmentSize = fragmentInfo & 0x1FFF; // bits 0 - 13
bool isLast = fragmentInfo & 0x010000; // bit 16 bool isLast = fragmentInfo & 0x010000; // bit 16
uint8_t fragmentNum = fragmentInfo >> 17; // bits 23 - 17 uint8_t fragmentNum = fragmentInfo >> 17; // bits 23 - 17
LogPrint ("SSU data fragment ", (int)fragmentNum, " of message ", msgID, " size=", (int)fragmentSize, isLast ? " last" : " non-last"); LogPrint ("SSU data fragment ", (int)fragmentNum, " of message ", msgID, " size=", (int)fragmentSize, isLast ? " last" : " non-last");
I2NPMessage * msg = nullptr; I2NPMessage * msg = nullptr;
if (fragmentNum > 0) // follow-up fragment if (fragmentNum > 0) // follow-up fragment
{ {
@ -414,15 +414,35 @@ namespace ssu
m_IncomleteMessages.erase (msgID); m_IncomleteMessages.erase (msgID);
msg->FromSSU (msgID); msg->FromSSU (msgID);
i2p::HandleI2NPMessage (msg, false); i2p::HandleI2NPMessage (msg, false);
SendMsgAck (msgID);
} }
} }
buf += fragmentSize; buf += fragmentSize;
} }
} }
void SSUSession::SendMsgAck (uint32_t msgID)
{
uint8_t buf[48]; // actual length is 44 = 37 + 7 but pad it to multiple of 16
uint8_t iv[16];
*buf = DATA_FLAG_EXPLICIT_ACKS_INCLUDED; // flag
buf[1] = 1; // number of ACKs
*(uint32_t *)(buf + 2) = htobe32 (msgID); // msgID
buf[6] = 0; // number of fragments
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
rnd.GenerateBlock (iv, 16); // random iv
// encrypt message with session key
FillHeaderAndEncrypt (PAYLOAD_TYPE_DATA, buf, 48, m_SessionKey, iv, m_MacKey);
m_State = eSessionStateConfirmedSent;
m_Server->Send (buf, 48, m_RemoteEndpoint);
}
SSUServer::SSUServer (boost::asio::io_service& service, int port): SSUServer::SSUServer (boost::asio::io_service& service, int port):
m_Endpoint (boost::asio::ip::udp::v4 (), port), m_Socket (service, m_Endpoint) m_Endpoint (boost::asio::ip::udp::v4 (), port), m_Socket (service, m_Endpoint)
{ {
m_Socket.set_option (boost::asio::socket_base::receive_buffer_size (65535));
m_Socket.set_option (boost::asio::socket_base::send_buffer_size (65535));
} }
SSUServer::~SSUServer () SSUServer::~SSUServer ()

9
SSU.h
View File

@ -37,6 +37,14 @@ namespace ssu
const uint8_t PAYLOAD_TYPE_TEST = 7; const uint8_t PAYLOAD_TYPE_TEST = 7;
const uint8_t PAYLOAD_TYPE_SESSION_DESTROY = 8; const uint8_t PAYLOAD_TYPE_SESSION_DESTROY = 8;
// data flags
const uint8_t DATA_FLAG_EXTENDED_DATA_INCLUDED = 0x02;
const uint8_t DATA_FLAG_WANT_REPLY = 0x04;
const uint8_t DATA_FLAG_REQUEST_PREVIOUS_ACKS = 0x08;
const uint8_t DATA_FLAG_EXPLICIT_CONGESTION_NOTIFICATION = 0x10;
const uint8_t DATA_FLAG_ACK_BITFIELDS_INCLUDED = 0x40;
const uint8_t DATA_FLAG_EXPLICIT_ACKS_INCLUDED = 0x80;
enum SessionState enum SessionState
{ {
eSessionStateUnknown, eSessionStateUnknown,
@ -73,6 +81,7 @@ namespace ssu
void ProcessSessionConfirmed (uint8_t * buf, size_t len); void ProcessSessionConfirmed (uint8_t * buf, size_t len);
void SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress, uint32_t relayTag); void SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress, uint32_t relayTag);
void ProcessData (uint8_t * buf, size_t len); void ProcessData (uint8_t * buf, size_t len);
void SendMsgAck (uint32_t msgID);
bool ProcessIntroKeyEncryptedMessage (uint8_t expectedPayloadType, i2p::data::RouterInfo& r, 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); void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len, uint8_t * aesKey, uint8_t * iv, uint8_t * macKey);