internal void ProcessReceivedNat1TestRequest(SocketWithReceiver socket, byte[] udpData, IPEndPoint remoteEndpoint) // receiver thread
{
// todo put some limits here per endpoint? or we don't care?
var request = NatTest1RequestPacket.Decode(udpData);
var response = new NatTest1ResponsePacket {
RequesterEndpoint = remoteEndpoint, Token32 = request.Token32
};
var responseData = response.Encode();
socket.UdpSocket.Send(responseData, responseData.Length, remoteEndpoint);
}
async void TestNat1Async(DrpPeerEngine drpPeerEngine)
{
_visionChannel.Emit("NATtest1", "NATtest1", AttentionLevel.guiActivity, $"running NAT#1 test....");
for (int loop = 0; ; loop++)
{
if (!Nat1TestStarted)
{
break;
}
if (drpPeerEngine.IsDisposed)
{
break;
}
await drpPeerEngine.EngineThreadQueue.WaitAsync(TimeSpan.FromMilliseconds(20), "nattest1 528");
short?ttl = null;
if (short.TryParse(Nat1TestTTL, out var ttl2))
{
ttl = ttl2;
}
var rnd = new Random();
var epLines = Nat1TestRemoteEPs.Split(new[] { "\r", "\n" }, StringSplitOptions.RemoveEmptyEntries);
foreach (var epLine in epLines)
{
var i0 = epLine.IndexOf(':');
if (i0 == -1)
{
continue;
}
var ipStr = epLine.Substring(0, i0);
if (!IPAddress.TryParse(ipStr, out var epIP))
{
continue;
}
var portsStr = epLine.Substring(i0 + 1);
int portsRangeStart, portsRangeEnd; // inclusive
var i1 = portsStr.IndexOf('-');
if (i1 == -1)
{
if (!Int32.TryParse(portsStr, out var port1))
{
continue;
}
portsRangeStart = portsRangeEnd = port1;
}
else
{
if (!Int32.TryParse(portsStr.Substring(0, i1), out portsRangeStart))
{
continue;
}
if (!Int32.TryParse(portsStr.Substring(i1 + 1), out portsRangeEnd))
{
continue;
}
if (portsRangeEnd <= portsRangeStart)
{
continue;
}
}
var port = portsRangeStart + loop % (portsRangeEnd - portsRangeStart + 1);
var responderEp = new IPEndPoint(epIP, port);
var req = new NatTest1RequestPacket {
Token32 = (uint)rnd.Next()
};
var sw = Stopwatch.StartNew();
var nateTest1responseData = await drpPeerEngine.SendUdpRequestAsync_Retransmit(new PendingLowLevelUdpRequest("nattest1 23",
responderEp
, NatTest1ResponsePacket.GetScanner(req.Token32),
drpPeerEngine.DateTimeNowUtc,
1.0,
req.Encode(),
0.3,
1.2
)
{ TTL = ttl });
if (nateTest1responseData != null)
{
var nateTest1response = NatTest1ResponsePacket.Decode(nateTest1responseData);
_visionChannel.Emit("NATtest1", "NATtest1", AttentionLevel.guiActivity, $"response from {responderEp}: {nateTest1response.RequesterEndpoint} {(int)sw.Elapsed.TotalMilliseconds}ms");
}
else
{
_visionChannel.Emit("NATtest1", "NATtest1", AttentionLevel.guiActivity, $"no response from {responderEp}");
}
}
if (int.TryParse(Nat1TestWaitTimeMs, out var sleepTimeMs))
{
await drpPeerEngine.EngineThreadQueue.WaitAsync(TimeSpan.FromMilliseconds(sleepTimeMs), "nattest1 247");
}
}
}
