async Task <StunResult> RunImpl()
{
if (m_Future != null)
{
throw new Exception("already run");
}
if (m_RemoteEP == null)
{
m_RemoteEP = await GetEndPoint();
}
var test1 = await DoTransaction(m_RemoteEP);
if (test1 == null)
{
return(Result = new StunResult(NatType.Unspecified, null, await GetLocalEndPoint()));
}
var test2 = await DoTransaction(true, true, m_RemoteEP);
if (m_Socket.LocalEndPoint.Equals(test1.MappedAddress))
{
if (test2 != null)
{
return(new StunResult(NatType.OpenInternet, test1.MappedAddress.EndPoint, await GetLocalEndPoint()));
}
else
{
return(new StunResult(NatType.SymmetricUDPFirewall, test1.MappedAddress.EndPoint, await GetLocalEndPoint()));
}
}
else if (test2 != null)
{
return(new StunResult(NatType.FullCone, test1.MappedAddress.EndPoint, await GetLocalEndPoint()));
}
var test12 = await DoTransaction(test1.ChangedAddress.EndPoint);
if (test12 == null)
{
throw new Exception("STUN Test I(II) fail.");
}
else if (!test12.MappedAddress.Equals(test1.MappedAddress))
{
return(new StunResult(NatType.Symmetric, test1.MappedAddress.EndPoint, await GetLocalEndPoint()));
}
var test3 = await DoTransaction(false, true, test1.ChangedAddress.EndPoint);
if (test3 != null)
{
return(new StunResult(NatType.Restricted, test1.MappedAddress.EndPoint, await GetLocalEndPoint()));
}
else
{
return(new StunResult(NatType.PortRestricted, test1.MappedAddress.EndPoint, await GetLocalEndPoint()));
}
}
public async Task <StunResult> Run(CancellationToken token)
{
m_Token = token;
if (m_RunTask != null)
{
await m_RunTask;
}
m_RunTask = RunImpl();
Result = await m_RunTask;
m_RunTask = null;
return(Result);
}
