/* ==============================
** = InitServer() Function =
** ==============================
**
** Initializes the server instance and starts it.
** Sets IP address and port and checks if port is valid.
**
** Return values:
** ==============
** 0 -> Success.
**
** 1 -> If the port is not larger than 1024 the function returns 1,
** indicating that the port in within the well-known port range
** and thus invalid for use of internal applications.
**
** 2 -> The port is already beeing used by a other application or
** server instance and cannot be used.
**
** 3 -> Sanity check indicating that still, after all checks the
** IP or port are invalid.
**
** 5 + SocketError -> TcpListener could not be started.
** The return value is 5 + error code of the caught socket exception.
** To get the underlying socket error simply subtract 5 from
** the return value of this function.
** The SocketError enum defines SocketError.SocketError as -1.
** It symbolizes an unkown socket error, due to this value you
** need to check for 4 <= InitServer(IPAddress, int).
**
** Example:
** ========
** int retVal = InitServer(IPAddress, int);
** if (4 <= retVal) {
** SocketError sErr = retVal - 5;
** throw new SocketException(sErr);
** }
*/
private int InitServer(IPAddress address, int port)
{
if (1024 >= port)
{
return(1);
} /* Check if port is within reserved and well-known range. */
if (!(PortUtil.IsAvailable(port)))
{
return(2);
} /* Check if the port is already used on the machine. */
// Set IP address and port member.
IPAddress = address;
Port = port;
try {
_listener = new TcpListener(IPAddress, Port);
_listener.Start();
} /* try to initializes internal TcpListener and start it. */
catch (ArgumentNullException) {
return(3);
} /* IP or port where invalid. */
catch (ArgumentOutOfRangeException) {
return(3);
} /* IP or port where out of range. */
catch (SocketException ex) {
return(5 + ex.ErrorCode);
} /* TcpListener could not be started.*/
// Everything went well.
return(0);
}
/// <summary>
/// Creates a new server instance on local host 127.0.0.1
/// and a port between 46337 and 46997.
/// </summary>
/// <returns>Returns a server instance that runs
/// on the local host address 127.0.0.1</returns>
/// <exception cref="Exception">Throws any exception produced
/// by the server(string, int) constructor.</exception>
public static TinyTcpServer StartLocal()
{
try
{
int[] port = PortUtil.GetAvailablePorts(
PortRange.PR_46337_46997,
true);
var server = new TinyTcpServer("127.0.0.1", port[0]);
return(server);
}
catch (Exception e) {
throw new Exception(e.Message);
}
}