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create and send RelayRequest

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orignal 2022-04-27 18:52:44 -04:00
parent 2e691b6655
commit 9db7ec6bb0
2 changed files with 59 additions and 1 deletions
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57
libi2pd/SSU2.cpp
View file

@ -63,6 +63,50 @@ namespace transport
SendTokenRequest ();
}
bool SSU2Session::Introduce (std::shared_ptr<SSU2Session> session, uint32_t relayTag)
{
// we are Alice
if (!session || !relayTag) return false;
// find local adddress to introduce
std::shared_ptr<const i2p::data::RouterInfo::Address> localAddress;
if (session->m_Address->IsV4 ())
localAddress = i2p::context.GetRouterInfo ().GetSSU2V4Address ();
else if (session->m_Address->IsV6 ())
localAddress = i2p::context.GetRouterInfo ().GetSSU2V6Address ();
if (localAddress) return false;
// create nonce
uint32_t nonce;
RAND_bytes ((uint8_t *)&nonce, 4);
auto ts = i2p::util::GetSecondsSinceEpoch ();
// payload
uint8_t payload[SSU2_MAX_PAYLOAD_SIZE];
size_t payloadSize = 0;
payload[0] = eSSU2BlkRelayRequest;
payload[3] = 0; // flag
htobe32buf (payload + 4, nonce);
htobe32buf (payload + 8, relayTag);
htobe32buf (payload + 12, ts);
payload[16] = 2; // ver
size_t asz = CreateEndpoint (payload + 18, SSU2_MAX_PAYLOAD_SIZE - 18, boost::asio::ip::udp::endpoint (localAddress->host, localAddress->port));
if (!asz) return false;
payload[17] = asz;
payloadSize += asz + 17;
SignedData s;
s.Insert ((const uint8_t *)"RelayRequestData", 16); // prologue
s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
s.Insert (session->GetRemoteIdentity ()->GetIdentHash (), 32); // chash
s.Insert (payload + 4, 14 + asz); // nonce, relay tag, timestamp, ver, asz and Alice's endpoint
s.Sign (i2p::context.GetPrivateKeys (), payload + 17 + asz);
payloadSize += i2p::context.GetIdentity ()->GetSignatureLen ();
htobe16buf (payload + 1, payloadSize - 3); // size
payloadSize += CreatePaddingBlock (payload + payloadSize, SSU2_MAX_PAYLOAD_SIZE - payloadSize);
// send
m_RelaySessions.emplace (nonce, std::make_pair (session, ts));
SendData (payload, payloadSize);
return true;
}
void SSU2Session::Terminate ()
{
if (m_State != eSSU2SessionStateTerminated)
@ -1080,6 +1124,19 @@ namespace transport
else
{
// we are Alice, message from Bob
boost::asio::ip::udp::endpoint ep;
if (ExtractEndpoint (buf + 12, buf[11], ep))
{
// update Charlie's address and connect
auto addr = std::make_shared<i2p::data::RouterInfo::Address> ();
auto addr1 = it->second.first->m_Address;
addr->transportStyle = i2p::data::RouterInfo::eTransportSSU2;
addr->host = ep.address (); addr->port = ep.port ();
addr->s = addr1->s; addr->i = addr1->i; addr->caps = addr1->caps;
it->second.first->m_Address = addr;
it->second.first->m_State = eSSU2SessionStateUnknown;
it->second.first->Connect ();
}
}
m_RelaySessions.erase (it);
}

3
libi2pd/SSU2.h
View file

@ -141,6 +141,7 @@ namespace transport
const boost::asio::ip::udp::endpoint& GetRemoteEndpoint () const { return m_RemoteEndpoint; };
void Connect ();
bool Introduce (std::shared_ptr<SSU2Session> session, uint32_t relayTag);
void Terminate ();
void TerminateByTimeout ();
void CleanUp (uint64_t ts);
@ -200,7 +201,7 @@ namespace transport
size_t CreateFollowOnFragmentBlock (uint8_t * buf, size_t len, std::shared_ptr<I2NPMessage> msg, uint8_t& fragmentNum, uint32_t msgID);
size_t CreateRelayIntroBlock (uint8_t * buf, size_t len, const uint8_t * introData, size_t introDataLen);
size_t CreateRelayResponseBlock (uint8_t * buf, size_t len, uint32_t nonce); // Charlie
private:
SSU2Server& m_Server;