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create initial peer test

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orignal 2022-05-31 18:31:05 -04:00
parent 29a4366dcf
commit 593d6bf466
2 changed files with 39 additions and 5 deletions
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42
libi2pd/SSU2.cpp
View File

@ -68,11 +68,7 @@ namespace transport
// 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 ();
auto localAddress = session->FindLocalAddress ();
if (localAddress) return false;
// create nonce
uint32_t nonce;
@ -1361,6 +1357,18 @@ namespace transport
return size;
}
std::shared_ptr<const i2p::data::RouterInfo::Address> SSU2Session::FindLocalAddress () const
{
if (m_Address)
{
if (m_Address->IsV4 ())
return i2p::context.GetRouterInfo ().GetSSU2V4Address ();
if (m_Address->IsV6 ())
return i2p::context.GetRouterInfo ().GetSSU2V6Address ();
}
return nullptr;
}
size_t SSU2Session::CreateAddressBlock (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& ep)
{
if (len < 9) return 0;
@ -1556,6 +1564,30 @@ namespace transport
return payloadSize + 3;
}
size_t SSU2Session::CreatePeerTestBlock (uint8_t * buf, size_t len)
{
auto localAddress = FindLocalAddress ();
if (localAddress) return 0;
// signed data
uint32_t nonce;
RAND_bytes ((uint8_t *)&nonce, 4);
auto ts = i2p::util::GetSecondsSinceEpoch ();
uint8_t signedData[96];
signedData[0] = 2; // ver
htobe32buf (signedData + 1, nonce);
htobe32buf (signedData + 5, ts);
size_t asz = CreateEndpoint (signedData + 7, 86, boost::asio::ip::udp::endpoint (localAddress->host, localAddress->port));
signedData[6] = asz;
// signature
SignedData s;
s.Insert ((const uint8_t *)"PeerTestValidate", 16); // prologue
s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
s.Insert (signedData, 7 + asz); // ver, nonce, ts, asz, Alice's endpoint
s.Sign (i2p::context.GetPrivateKeys (), signedData + 7 + asz);
return CreatePeerTestBlock (buf, len, 0, i2p::context.GetIdentHash (),
signedData, 7 + asz + i2p::context.GetIdentity ()->GetSignatureLen ());
}
std::shared_ptr<const i2p::data::RouterInfo> SSU2Session::ExtractRouterInfo (const uint8_t * buf, size_t size)
{
if (size < 2) return nullptr;

2
libi2pd/SSU2.h
View File

@ -196,6 +196,7 @@ namespace transport
void HandleAckRange (uint32_t firstPacketNum, uint32_t lastPacketNum);
bool ExtractEndpoint (const uint8_t * buf, size_t size, boost::asio::ip::udp::endpoint& ep);
size_t CreateEndpoint (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& ep);
std::shared_ptr<const i2p::data::RouterInfo::Address> FindLocalAddress () const;
std::shared_ptr<const i2p::data::RouterInfo> ExtractRouterInfo (const uint8_t * buf, size_t size);
void CreateNonce (uint64_t seqn, uint8_t * nonce);
bool UpdateReceivePacketNum (uint32_t packetNum); // for Ack, returns false if duplicate
@ -217,6 +218,7 @@ namespace transport
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 CreatePeerTestBlock (uint8_t * buf, size_t len, uint8_t msg, const uint8_t * routerHash, const uint8_t * signedData, size_t signedDataLen);
size_t CreatePeerTestBlock (uint8_t * buf, size_t len); // Alice
private: