/// <summary>
/// Handles exceptions thrown during a call to <see cref="OpenClientSession"/> method
/// </summary>
/// <param name="exception">The exception to handle</param>
private static void HandleConnectionException(SocketException exception)
{
/*
* This method checks for conditions that are likely to occur
* when connecting to a remote host.
* Such conditions might only be temporary and due to the following situations:
* - The remote host has no specified port in a listening state
* - The specified host is not reachable
* - The network is down
* - The route to the destination network is not known
* - The route to the destination host is not known
* - Connection request to the remote host timed out
*/
switch (exception.NativeErrorCode)
{
case 10050: //WSAENETDOWN -- The network is down
case 10051: //WSAENETUNREACH -- The network is unreachable
case 10060: //WSAETIMEDOUT -- Connection time out
case 10061: //WSAECONNREFUSED -- No specified port is in a listening state on the remote machine
case 10064: //WSAHOSTDOWN -- The remote host is down
case 10065: //WSAHOSTUNREACH -- The remote host is unreachable
case 11001: //WSAHOST_NOT_FOUND -- Host not found, no such host is known
//Wrap this exception in a TcpIpConnectionException exception and throw
throw new TcpIpConnectionException(exception);
default:
//For any other error code not listed, throw TcpIpException exception
TcpIpException.WrapAndThrow(exception);
break;
}
}
private void WrapAndThrow(SocketException exception)
{
/*
* This code checks for error codes that a likely to be caused
* by a failure in connection to a remote host.
* Such situations will render the session incapable to serve
* any subsequent requests.
*/
switch (exception.NativeErrorCode)
{
case 10050: //WSAENETDOWN -- Network is down
case 10052: //WSAENETRESET -- Connection broken due to failure in connection
case 10053: //WSAECONNABORTED -- Connection was aborted by a software in the host machine
case 10054: //WSAECONNRESET -- Remote host forcebly closed connection
case 10057: //WSAENOTCONN -- Socket is not connected
case 10064: //WSAHOSTDOWN -- Remote host is down
case 10101: //WSAEDISCON -- Remote party has called a graceful shutdown
//Wrap this exception in a new exception
throw new TcpIpSessionClosedException(exception);
default:
//Rethrow the original exception
TcpIpException.WrapAndThrow(exception);
break;
}
}
