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orignal 2024-10-16 09:04:35 -04:00
parent 97fdedfbe3
commit d69e957213
2 changed files with 45 additions and 4 deletions
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47
libi2pd/SSU2Session.cpp
View file

@ -1352,6 +1352,46 @@ namespace transport
return true; return true;
} }
void SSU2Session::SendHolePunch (uint32_t nonce, const boost::asio::ip::udp::endpoint& ep,
const uint8_t * introKey, uint64_t token)
{
// we are Charlie
LogPrint (eLogDebug, "SSU2: Sending HolePunch to ", ep);
Header header;
uint8_t h[32], payload[SSU2_MAX_PACKET_SIZE];
// fill packet
header.h.connID = htobe64 (((uint64_t)nonce << 32) | nonce); // dest id
RAND_bytes (header.buf + 8, 4); // random packet num
header.h.type = eSSU2HolePunch;
header.h.flags[0] = 2; // ver
header.h.flags[1] = (uint8_t)i2p::context.GetNetID (); // netID
header.h.flags[2] = 0; // flag
memcpy (h, header.buf, 16);
uint64_t c = ~header.h.connID;
memcpy (h + 16, &c, 8); // source id
RAND_bytes (h + 24, 8); // token
// payload
payload[0] = eSSU2BlkDateTime;
htobe16buf (payload + 1, 4);
htobe32buf (payload + 3, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000);
size_t payloadSize = 7;
payloadSize += CreateAddressBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize, ep);
payloadSize += CreateRelayResponseBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize,
eSSU2RelayResponseCodeAccept, nonce, token, ep.address ().is_v4 ());
payloadSize += CreatePaddingBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize);
// encrypt
uint8_t n[12];
CreateNonce (be32toh (header.h.packetNum), n);
i2p::crypto::AEADChaCha20Poly1305 (payload, payloadSize, h, 32, introKey, n, payload, payloadSize + 16, true);
payloadSize += 16;
header.ll[0] ^= CreateHeaderMask (introKey, payload + (payloadSize - 24));
header.ll[1] ^= CreateHeaderMask (introKey, payload + (payloadSize - 12));
memset (n, 0, 12);
i2p::crypto::ChaCha20 (h + 16, 16, introKey, n, h + 16);
// send
m_Server.Send (header.buf, 16, h + 16, 16, payload, payloadSize, ep);
}
bool SSU2Session::ProcessHolePunch (uint8_t * buf, size_t len) bool SSU2Session::ProcessHolePunch (uint8_t * buf, size_t len)
{ {
// we are Alice // we are Alice
@ -1970,11 +2010,10 @@ namespace transport
{ {
if (m_Server.IsSupported (ep.address ())) if (m_Server.IsSupported (ep.address ()))
{ {
token = m_Server.GetIncomingToken (ep);
isV4 = ep.address ().is_v4 (); isV4 = ep.address ().is_v4 ();
auto holePunchSession = std::make_shared<SSU2HolePunchSession>( SendHolePunch (bufbe32toh (buf + 33), ep, addr->i, token);
m_Server, bufbe32toh (buf + 33), ep, addr); m_Server.AddConnectedRecently (ep, i2p::util::GetSecondsSinceEpoch ());
m_Server.AddSession (holePunchSession);
holePunchSession->SendHolePunch ();
} }
else else
{ {

2
libi2pd/SSU2Session.h
View file

@ -274,6 +274,8 @@ namespace transport
bool ProcessSessionConfirmed (uint8_t * buf, size_t len); bool ProcessSessionConfirmed (uint8_t * buf, size_t len);
bool ProcessRetry (uint8_t * buf, size_t len); bool ProcessRetry (uint8_t * buf, size_t len);
bool ProcessHolePunch (uint8_t * buf, size_t len); bool ProcessHolePunch (uint8_t * buf, size_t len);
void SendHolePunch (uint32_t nonce, const boost::asio::ip::udp::endpoint& ep,
const uint8_t * introKey, uint64_t token);
virtual bool ProcessPeerTest (uint8_t * buf, size_t len); virtual bool ProcessPeerTest (uint8_t * buf, size_t len);
void ProcessData (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& from); void ProcessData (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& from);