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store endpoint and send packet

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orignal 2022-02-28 21:46:00 -05:00
parent 35afa98112
commit 1511dcb309
2 changed files with 87 additions and 17 deletions
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76
libi2pd/SSU2.cpp
View file

@ -8,6 +8,7 @@
#include <string.h>
#include <openssl/rand.h>
#include "Log.h"
#include "RouterContext.h"
#include "Transports.h"
#include "SSU2.h"
@ -19,7 +20,7 @@ namespace transport
SSU2Session::SSU2Session (SSU2Server& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter,
std::shared_ptr<const i2p::data::RouterInfo::Address> addr, bool peerTest):
TransportSession (in_RemoteRouter, SSU2_TERMINATION_TIMEOUT),
m_Server (server), m_Address (addr)
m_Server (server), m_Address (addr), m_DestConnID (0), m_SourceConnID (0)
{
m_NoiseState.reset (new i2p::crypto::NoiseSymmetricState);
if (in_RemoteRouter && addr)
@ -42,27 +43,28 @@ namespace transport
m_NoiseState->MixKey (sharedSecret);
Header header;
uint64_t headerX[6];
uint8_t payload[1200]; // TODO: correct payload size
uint8_t headerX[48], payload[1200]; // TODO: correct payload size
size_t payloadSize = 8;
// fill packet
RAND_bytes (header.h.connID, 8);
RAND_bytes ((uint8_t *)&m_DestConnID, 8);
header.h.connID = m_DestConnID; // dest id
memset (header.h.packetNum, 0, 4);
header.h.type = eSSU2SessionRequest;
header.h.flags[0] = 2; // ver
header.h.flags[1] = 2; // netID TODO:
header.h.flags[2] = 0; // flag
RAND_bytes ((uint8_t *)headerX, 8); // source id
memset (headerX + 1, 0, 8); // token
memcpy (headerX + 2, m_EphemeralKeys->GetPublicKey (), 32); // X
m_Server.AddSession (headerX[0], shared_from_this ());
RAND_bytes ((uint8_t *)&m_SourceConnID, 8);
memcpy (headerX, &m_SourceConnID, 8); // source id
memset (headerX + 8, 0, 8); // token
memcpy (headerX + 16, m_EphemeralKeys->GetPublicKey (), 32); // X
m_Server.AddPendingOutgoingSession (boost::asio::ip::udp::endpoint (m_Address->host, m_Address->port), shared_from_this ());
// encrypt
const uint8_t nonce[12] = {0};
i2p::crypto::AEADChaCha20Poly1305 (payload, payloadSize, m_NoiseState->m_H, 32, m_NoiseState->m_CK + 32, nonce, payload, payloadSize + 16, true);
payloadSize += 16;
CreateHeaderMask (m_Address->i, payload + (payloadSize - 24), m_Address->i, payload + (payloadSize - 12));
EncryptHeader (header);
i2p::crypto::ChaCha20 ((uint8_t *)headerX, 48, m_Address->i, nonce, (uint8_t *)headerX);
i2p::crypto::ChaCha20 (headerX, 48, m_Address->i, nonce, headerX);
}
@ -80,12 +82,39 @@ namespace transport
i2p::crypto::ChaCha20 (data, 8, kh2, nonce2, m_HeaderMask.buf + 8);
}
SSU2Server::SSU2Server (int port):
m_Socket (m_Service), m_Endpoint (boost::asio::ip::udp::v6 (), port)
{
}
void SSU2Server::OpenSocket ()
{
try
{
m_Socket.open (boost::asio::ip::udp::v6());
m_Socket.set_option (boost::asio::socket_base::receive_buffer_size (SSU2_SOCKET_RECEIVE_BUFFER_SIZE));
m_Socket.set_option (boost::asio::socket_base::send_buffer_size (SSU2_SOCKET_SEND_BUFFER_SIZE));
m_Socket.bind (m_Endpoint);
LogPrint (eLogInfo, "SSU2: Start listening port ", m_Endpoint.port());
}
catch (std::exception& ex )
{
LogPrint (eLogError, "SSU2: Failed to bind to port ", m_Endpoint.port(), ": ", ex.what());
ThrowFatal ("Unable to start SSU2 transport at port ", m_Endpoint.port(), ": ", ex.what ());
}
}
void SSU2Server::AddSession (uint64_t connID, std::shared_ptr<SSU2Session> session)
{
m_Sessions.emplace (connID, session);
}
void SSU2Server::ProcessNextPacket (uint8_t * buf, size_t len)
void SSU2Server::AddPendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep, std::shared_ptr<SSU2Session> session)
{
m_PendingOutgoingSessions.emplace (ep, session);
}
void SSU2Server::ProcessNextPacket (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint)
{
uint64_t key = 0, connID;
i2p::crypto::ChaCha20 ((uint8_t *)&key, 8, i2p::context.GetNTCP2IV (), buf + (len - 24), (uint8_t *)&key); // TODO: use SSU2 intro key
@ -95,6 +124,33 @@ namespace transport
if (it != m_Sessions.end ())
{
}
else
{
// check pending sessions if it's SessionCreated
auto it1 = m_PendingOutgoingSessions.find (senderEndpoint);
if (it1 != m_PendingOutgoingSessions.end ())
{
m_PendingOutgoingSessions.erase (it1);
}
else
{
// assume new incoming session
}
}
}
void SSU2Server::Send (const uint8_t * header, size_t headerLen, const uint8_t * headerX, size_t headerXLen,
const uint8_t * payload, size_t payloadLen, const boost::asio::ip::udp::endpoint& to)
{
std::vector<boost::asio::const_buffer> bufs
{
boost::asio::buffer (header, headerLen),
boost::asio::buffer (headerX, headerXLen),
boost::asio::buffer (payload, payloadLen)
};
boost::system::error_code ec;
m_Socket.send_to (bufs, to, 0, ec);
}
}
}

28
libi2pd/SSU2.h
View file

@ -10,7 +10,9 @@
#define SSU2_H__
#include <memory>
#include <map>
#include <unordered_map>
#include <boost/asio.hpp>
#include "Crypto.h"
#include "RouterInfo.h"
#include "TransportSession.h"
@ -20,7 +22,9 @@ namespace i2p
namespace transport
{
const int SSU2_TERMINATION_TIMEOUT = 330; // 5.5 minutes
const size_t SSU2_SOCKET_RECEIVE_BUFFER_SIZE = 0x1FFFF; // 128K
const size_t SSU2_SOCKET_SEND_BUFFER_SIZE = 0x1FFFF; // 128K
enum SSU2MessageType
{
eSSU2SessionRequest = 0
@ -35,7 +39,7 @@ namespace transport
uint8_t buf[16];
struct
{
uint8_t connID[8];
uint64_t connID;
uint8_t packetNum[4];
uint8_t type;
uint8_t flags[3];
@ -60,7 +64,8 @@ namespace transport
std::shared_ptr<i2p::crypto::X25519Keys> m_EphemeralKeys;
std::unique_ptr<i2p::crypto::NoiseSymmetricState> m_NoiseState;
std::shared_ptr<const i2p::data::RouterInfo::Address> m_Address;
uint64_t m_DestConnID, m_SourceConnID;
union
{
uint64_t ll[2];
@ -72,18 +77,27 @@ namespace transport
{
public:
SSU2Server (int port) {};
SSU2Server (int port);
~SSU2Server () {};
void AddSession (uint64_t connID, std::shared_ptr<SSU2Session> session);
void AddPendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep, std::shared_ptr<SSU2Session> session);
private:
void ProcessNextPacket (uint8_t * buf, size_t len);
void Send (const uint8_t * header, size_t headerLen, const uint8_t * headerX, size_t headerXLen,
const uint8_t * payload, size_t payloadLen, const boost::asio::ip::udp::endpoint& to);
private:
void OpenSocket ();
void ProcessNextPacket (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
private:
boost::asio::io_service m_Service;
boost::asio::ip::udp::socket m_Socket;
boost::asio::ip::udp::endpoint m_Endpoint;
std::unordered_map<uint64_t, std::shared_ptr<SSU2Session> > m_Sessions;
std::map<boost::asio::ip::udp::endpoint, std::shared_ptr<SSU2Session> > m_PendingOutgoingSessions;
};
}
}