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implemented connect and close

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orignal 2014-01-12 15:57:10 -05:00
parent 460d4e754e
commit 07eb5baac0
2 changed files with 83 additions and 11 deletions
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83
Streaming.cpp
View file

@ -16,7 +16,7 @@ namespace i2p
namespace stream
{
Stream::Stream (StreamingDestination * local, const i2p::data::LeaseSet * remote):
m_SendStreamID (0), m_SequenceNumber (0), m_LastReceivedSequenceNumber (0),
m_SendStreamID (0), m_SequenceNumber (0), m_LastReceivedSequenceNumber (0), m_IsOpen (false),
m_LocalDestination (local), m_RemoteLeaseSet (remote), m_OutboundTunnel (nullptr)
{
m_RecvStreamID = i2p::context.GetRandomNumberGenerator ().GenerateWord32 ();
@ -54,7 +54,7 @@ namespace stream
{
LogPrint ("Synchronize");
}
if (flags & PACKET_FLAG_SIGNATURE_INCLUDED)
{
LogPrint ("Signature");
@ -68,17 +68,36 @@ namespace stream
}
// we have reached payload section
LogPrint ("seqn=",m_LastReceivedSequenceNumber,", flags=", flags);
std::string str((const char *)buf, end-buf);
LogPrint ("Payload: ", str);
packet->offset = buf - packet->buf;
m_ReceiveQueue.Put (packet);
SendQuickAck ();
if (flags & PACKET_FLAG_CLOSE)
{
LogPrint ("Closed");
m_IsOpen = false;
}
else
SendQuickAck ();
}
size_t Stream::Send (uint8_t * buf, size_t len, int timeout)
{
if (!m_IsOpen)
ConnectAndSend (buf, len);
else
{
// TODO: implement
}
return len;
}
void Stream::ConnectAndSend (uint8_t * buf, size_t len)
{
m_IsOpen = true;
uint8_t packet[STREAMING_MTU];
size_t size = 0;
*(uint32_t *)(packet + size) = htobe32 (m_SendStreamID);
@ -94,15 +113,19 @@ namespace stream
size++; // resend delay
// TODO: for initial packet only, following packets have different falgs
*(uint16_t *)(packet + size) = htobe16 (PACKET_FLAG_SYNCHRONIZE |
PACKET_FLAG_FROM_INCLUDED | PACKET_FLAG_SIGNATURE_INCLUDED | PACKET_FLAG_NO_ACK);
PACKET_FLAG_FROM_INCLUDED | PACKET_FLAG_SIGNATURE_INCLUDED |
PACKET_FLAG_MAX_PACKET_SIZE_INCLUDED | PACKET_FLAG_NO_ACK);
size += 2; // flags
*(uint16_t *)(packet + size) = htobe16 (sizeof (i2p::data::Identity) + 40); // identity + signature
*(uint16_t *)(packet + size) = htobe16 (sizeof (i2p::data::Identity) + 40 + 2); // identity + signature + packet size
size += 2; // options size
memcpy (packet + size, &m_LocalDestination->GetIdentity (), sizeof (i2p::data::Identity));
size += sizeof (i2p::data::Identity); // from
*(uint16_t *)(packet + size) = htobe16 (STREAMING_MTU);
size += 2; // max packet size
uint8_t * signature = packet + size; // set it later
memset (signature, 0, 40); // zeroes for now
size += 40; // signature
memcpy (packet + size, buf, len);
size += len; // payload
m_LocalDestination->Sign (packet, size, signature);
@ -118,9 +141,8 @@ namespace stream
}
else
DeleteI2NPMessage (msg);
return len;
}
void Stream::SendQuickAck ()
{
uint8_t packet[STREAMING_MTU];
@ -152,6 +174,46 @@ namespace stream
else
DeleteI2NPMessage (msg);
}
void Stream::Close ()
{
if (m_IsOpen)
{
m_IsOpen = false;
uint8_t packet[STREAMING_MTU];
size_t size = 0;
*(uint32_t *)(packet + size) = htobe32 (m_SendStreamID);
size += 4; // sendStreamID
*(uint32_t *)(packet + size) = htobe32 (m_RecvStreamID);
size += 4; // receiveStreamID
*(uint32_t *)(packet + size) = htobe32 (m_SequenceNumber);
size += 4; // sequenceNum
*(uint32_t *)(packet + size) = htobe32 (m_LastReceivedSequenceNumber);
size += 4; // ack Through
packet[size] = 0;
size++; // NACK count
size++; // resend delay
*(uint16_t *)(packet + size) = PACKET_FLAG_CLOSE | PACKET_FLAG_SIGNATURE_INCLUDED;
size += 2; // flags
*(uint16_t *)(packet + size) = 40; // 40 bytes signature
size += 2; // options size
uint8_t * signature = packet + size;
memset (packet + size, 0, 40);
size += 40; // signature
m_LocalDestination->Sign (packet, size, signature);
I2NPMessage * msg = i2p::garlic::routing.WrapSingleMessage (m_RemoteLeaseSet,
CreateDataMessage (this, packet, size));
if (m_OutboundTunnel)
{
auto& lease = m_RemoteLeaseSet->GetLeases ()[0]; // TODO:
m_OutboundTunnel->SendTunnelDataMsg (lease.tunnelGateway, lease.tunnelID, msg);
LogPrint ("FIN sent");
}
else
DeleteI2NPMessage (msg);
}
}
size_t Stream::Receive (uint8_t * buf, size_t len, int timeout)
{
@ -316,6 +378,11 @@ namespace stream
Packet * uncompressed = new Packet;
uncompressed->offset = 0;
uncompressed->len = decompressor.MaxRetrievable ();
if (uncompressed->len > MAX_PACKET_SIZE)
{
LogPrint ("Recieved packet size exceeds mac packer size");
uncompressed->len = MAX_PACKET_SIZE;
}
decompressor.Get (uncompressed->buf, uncompressed->len);
// then forward to streaming engine
// TODO: we have onle one destination, might be more

11
Streaming.h
View file

@ -26,11 +26,12 @@ namespace stream
const uint16_t PACKET_FLAG_ECHO = 0x0200;
const uint16_t PACKET_FLAG_NO_ACK = 0x0400;
const size_t STREAMING_MTU = 1730;
const size_t STREAMING_MTU = 1730;
const size_t MAX_PACKET_SIZE = 1754;
struct Packet
{
uint8_t buf[STREAMING_MTU];
uint8_t buf[1754];
size_t len, offset;
Packet (): len (0), offset (0) {};
@ -48,19 +49,23 @@ namespace stream
uint32_t GetSendStreamID () const { return m_SendStreamID; };
uint32_t GetRecvStreamID () const { return m_RecvStreamID; };
const i2p::data::LeaseSet * GetRemoteLeaseSet () const { return m_RemoteLeaseSet; };
bool IsOpen () const { return m_IsOpen; };
bool IsEstablished () const { return m_SendStreamID; };
void HandleNextPacket (Packet * packet);
size_t Send (uint8_t * buf, size_t len, int timeout); // timeout in seconds
size_t Receive (uint8_t * buf, size_t len, int timeout); // returns 0 if timeout expired
void Close ();
private:
void ConnectAndSend (uint8_t * buf, size_t len);
void SendQuickAck ();
private:
uint32_t m_SendStreamID, m_RecvStreamID, m_SequenceNumber, m_LastReceivedSequenceNumber;
bool m_IsOpen;
StreamingDestination * m_LocalDestination;
const i2p::data::LeaseSet * m_RemoteLeaseSet;
i2p::util::Queue<Packet> m_ReceiveQueue;