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send RelayResponse rejection message

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orignal 2022-06-17 19:55:58 -04:00
parent 2067de162a
commit dd602a27b5
2 changed files with 36 additions and 3 deletions
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32
libi2pd/SSU2Session.cpp
View file

@ -857,7 +857,6 @@ namespace transport
LogPrint (eLogWarning, "SSU2: HolePunch AEAD verification failed ");
return false;
}
m_Server.UpdateOutgoingToken (m_RemoteEndpoint, headerX[1], i2p::util::GetSecondsSinceEpoch () + SSU2_TOKEN_EXPIRATION_TIMEOUT);
HandlePayload (payload, len - 48);
// connect to Charlie
if (m_State == eSSU2SessionStateIntroduced)
@ -1254,7 +1253,13 @@ namespace transport
if (!session)
{
LogPrint (eLogWarning, "SSU2: Session with relay tag ", relayTag, " not found");
return; // TODO: send relay response
// send relay response back to Alice
uint8_t payload[SSU2_MAX_PAYLOAD_SIZE];
size_t payloadSize = CreateRelayResponseBlock (payload, SSU2_MAX_PAYLOAD_SIZE,
eSSU2RelayResponseCodeBobRelayTagNotFound, bufbe32toh (buf + 1));
payloadSize += CreatePaddingBlock (payload + payloadSize, SSU2_MAX_PAYLOAD_SIZE - payloadSize);
SendData (payload, payloadSize);
return;
}
session->m_RelaySessions.emplace (bufbe32toh (buf + 1), // nonce
std::make_pair (shared_from_this (), i2p::util::GetSecondsSinceEpoch ()) );
@ -1348,7 +1353,7 @@ namespace transport
LogPrint (eLogWarning, "SSU2: RelayResponse signature verification failed");
}
else
LogPrint (eLogWarning, "SSU2: RelayResponse status code=", (int)buf[1]);
LogPrint (eLogInfo, "SSU2: RelayResponse status code=", (int)buf[1]);
}
m_RelaySessions.erase (it);
}
@ -1773,6 +1778,27 @@ namespace transport
return payloadSize + 3;
}
size_t SSU2Session::CreateRelayResponseBlock (uint8_t * buf, size_t len, SSU2RelayResponseCode code, uint32_t nonce)
{
// we are Bob
buf[0] = eSSU2BlkRelayResponse;
buf[3] = 0; // flag
buf[4] = (uint8_t)code; // code
htobe32buf (buf + 5, nonce); // nonce
htobe32buf (buf + 9, i2p::util::GetSecondsSinceEpoch ()); // timestamp
buf[13] = 2; // ver
buf[14] = 0; // csz
// signature
SignedData s;
s.Insert ((const uint8_t *)"RelayAgreementOK", 16); // prologue
s.Insert (i2p::context.GetIdentity ()->GetIdentHash (), 32); // bhash
s.Insert (buf + 5, 10); // nonce, timestamp, ver, csz
s.Sign (i2p::context.GetPrivateKeys (), buf + 15);
size_t payloadSize = 12 + i2p::context.GetIdentity ()->GetSignatureLen ();
htobe16buf (buf + 1, payloadSize); // size
return payloadSize + 3;
}
size_t SSU2Session::CreatePeerTestBlock (uint8_t * buf, size_t len, uint8_t msg, SSU2PeerTestCode code,
const uint8_t * routerHash, const uint8_t * signedData, size_t signedDataLen)
{

7
libi2pd/SSU2Session.h
View file

@ -102,6 +102,12 @@ namespace transport
eSSU2PeerTestCodeUnspecified = 128
};
enum SSU2RelayResponseCode
{
eSSU2RelayResponseCodeAccept = 0,
eSSU2RelayResponseCodeBobRelayTagNotFound = 5
};
struct SSU2IncompleteMessage
{
struct Fragment
@ -239,6 +245,7 @@ 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
size_t CreateRelayResponseBlock (uint8_t * buf, size_t len, SSU2RelayResponseCode code, uint32_t nonce); // Bob reject
size_t CreatePeerTestBlock (uint8_t * buf, size_t len, uint8_t msg, SSU2PeerTestCode code, const uint8_t * routerHash, const uint8_t * signedData, size_t signedDataLen);
size_t CreatePeerTestBlock (uint8_t * buf, size_t len, uint32_t nonce); // Alice