/// <summary>
/// Starts connecting to best target.
/// </summary>
private void BeginConnect()
{
// No tagets, abort relay.
if (m_pTargets.Count == 0)
{
LogText("No relay target(s) for '" + m_pRelayItem.To + "', aborting.");
Dispose(new Exception("No relay target(s) for '" + m_pRelayItem.To + "', aborting."));
return;
}
// If maximum connections to specified target exceeded and there are more targets, try to get limit free target.
if (m_pServer.MaxConnectionsPerIP > 0)
{
// For DNS or load-balnced smart host relay, search free target if any.
if (m_pServer.RelayMode == Relay_Mode.Dns || m_pServer.SmartHostsBalanceMode == BalanceMode.LoadBalance)
{
foreach (Relay_Target t in m_pTargets)
{
// We found free target, stop searching.
if (m_pServer.TryAddIpUsage(m_pTargets[0].Target.Address))
{
m_pActiveTarget = t;
m_pTargets.Remove(t);
break;
}
}
}
// Smart host fail-over mode, just check if it's free.
else
{
// Smart host IP limit not reached.
if (m_pServer.TryAddIpUsage(m_pTargets[0].Target.Address))
{
m_pActiveTarget = m_pTargets[0];
m_pTargets.RemoveAt(0);
}
}
}
// Just get first target.
else
{
m_pActiveTarget = m_pTargets[0];
m_pTargets.RemoveAt(0);
}
// If all targets has exeeded maximum allowed connection per IP address, end relay session,
// next relay cycle will try to relay again.
if (m_pActiveTarget == null)
{
LogText("All targets has exeeded maximum allowed connection per IP address, skip relay.");
Dispose(new Exception("All targets has exeeded maximum allowed connection per IP address, skip relay."));
return;
}
m_pSmtpClient.BeginConnect(new IPEndPoint(m_pLocalBindInfo.IP, 0), m_pActiveTarget.Target, false, new AsyncCallback(this.ConnectCallback), null);
}
