internal void SendFirstPeerTestToCharlie(PeerTest msg)
{
lock ( Sessions )
{
if (Sessions.Count > 0)
{
Sessions.Random().Value.SendFirstPeerTestToCharlie(msg);
}
}
}
void SendFirstPeerTestToCharlie(PeerTest msg)
{
SendMessage(
SSUHeader.MessageTypes.PeerTest,
Session.MACKey,
Session.SharedKey,
(start, writer) =>
{
Logging.LogTransport($"SSU {this}: PeerTest. We are Bob, relaying first message to Charlie. {msg}");
msg.WriteTo(writer);
return(true);
});
}
private void HandleIncomingPeerTestPackage(BufRefLen reader)
{
// We are Alice or Charlie and are receiving probe packet with intro key.
var msg = new PeerTest(reader);
if (Session.Host.PeerTestInstance.OurTestNonce(msg.TestNonce))
{
// We are alice running a test
Logging.LogTransport($"SSU {this}: PeerTest. We are Alice, and are getting a direct probe from Charlie. {msg}");
Session.Host.PeerTestInstance.CharlieDirectResponseReceived(msg);
return;
}
var nonceinfo = Session.Host.GetNonceInfo(msg.TestNonce.Peek32(0));
if (nonceinfo == null)
{
Logging.LogTransport($"SSU {this}: PeerTest. Created state: HandleIncomingPeerTestPackage received an unknown nonce. Dropped.");
return;
}
if (nonceinfo.Role == PeerTestRole.Charlie)
{
// We are Charlie and are getting a direct probe from Alice
SendMessage(
SSUHeader.MessageTypes.PeerTest,
msg.IntroKey,
msg.IntroKey,
(start, writer) =>
{
var toalice = new PeerTest(msg.TestNonce, msg.AliceIPAddr, msg.AlicePort, Session.MyRouterContext.IntroKey);
Logging.LogTransport($"SSU {this}: PeerTest. We are Charlie, and are getting a direct probe from Alice. {msg}");
toalice.WriteTo(writer);
return(true);
});
}
else
{
Logging.LogTransport("SSU {this}: PeerTest. Unexpected PeerTest received: {msg}");
}
}
private void RespondToPeerTestInitiationFromAlice(PeerTest msg, PeerTestNonceInfo nonceinfo)
{
// Nonce already in use for another test? Just ignore.
if (nonceinfo != null)
{
Logging.LogTransport("SSU {this}: PeerTest. We are Bob getting a iniation from Alice, but will drop it due to nonce clash. {msg}");
return;
}
Session.Host.SetNonceInfo(msg.TestNonce.Peek32(0), PeerTestRole.Bob);
var pt = new PeerTest(msg.TestNonce,
Session.RemoteEP.Address, Session.RemoteEP.Port,
msg.IntroKey);
Logging.LogTransport($"SSU {this}: PeerTest. We are Bob and sending first relay to Charlie: {pt}");
Session.Host.SendFirstPeerTestToCharlie(pt);
return;
}
private void HandleIncomingPeerTestPackage(BufRefLen reader)
{
var msg = new PeerTest(reader);
var nonceinfo = Session.Host.GetNonceInfo(msg.TestNonce.Peek32(0));
if (msg.AliceIPAddr.Length == 0 && msg.AlicePort.Peek16(0) == 0)
{
// We are Bob, and we got the first message from Alice
RespondToPeerTestInitiationFromAlice(msg, nonceinfo);
return;
}
if (!msg.IPAddressOk)
{
Logging.LogTransport($"SSU {this}: HandleIncomingPeerTestPackage: IP Address not accepted. Ignorning. {msg}");
return;
}
if (nonceinfo != null)
{
switch (nonceinfo.Role)
{
case PeerTestRole.Bob:
{
// Got initial response from Charlie
// Try to contact Alice
SendMessage(
new IPEndPoint(new IPAddress(msg.AliceIPAddr.ToByteArray()), msg.AlicePort.PeekFlip16(0)),
SSUHeader.MessageTypes.PeerTest,
msg.IntroKey,
msg.IntroKey,
(start, writer) =>
{
Logging.LogTransport($"SSU {this}: PeerTest. We are Bob, relaying response from Charlie to Alice {msg}");
msg.WriteTo(writer);
return(true);
});
}
return;
case PeerTestRole.Charlie:
{
// We got the final test from Alice
SendMessage(
SSUHeader.MessageTypes.PeerTest,
Session.MACKey,
Session.SharedKey,
(start, writer) =>
{
Logging.LogTransport($"SSU {this}: PeerTest. We are Charlie, responding to the final message from Alice {msg}");
msg.WriteTo(writer);
return(true);
});
}
return;
default:
Logging.Log($"SSU {this}: PeerTest. Unexpedted PeerTest received. {msg}");
break;
}
}
else
{
// We are Charlie receiving a relay from Bob.
Session.Host.SetNonceInfo(msg.TestNonce.Peek32(0), PeerTestRole.Charlie);
// Reply to Bob
SendMessage(
SSUHeader.MessageTypes.PeerTest,
Session.MACKey,
Session.SharedKey,
(start, writer) =>
{
Logging.LogTransport("SSU {this}: PeerTest. We are Charlie, responding to Bob. {msg}");
msg.WriteTo(writer);
return(true);
});
// Try to contact Alice
var toalice = new PeerTest(msg.TestNonce, msg.AliceIPAddr, msg.AlicePort, Session.MyRouterContext.IntroKey);
SendMessage(
new IPEndPoint(new IPAddress(msg.AliceIPAddr.ToByteArray()), msg.AlicePort.PeekFlip16(0)),
SSUHeader.MessageTypes.PeerTest,
msg.IntroKey,
msg.IntroKey,
(start, writer) =>
{
Logging.LogTransport($"SSU {this}: PeerTest. We are Charlie, sending first probe to Alice. {toalice}");
toalice.WriteTo(writer);
return(true);
});
}
}
internal void CharlieDirectResponseReceived(PeerTest msg)
{
}