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);
});
}
}
