/// <summary>
/// Try and parse an SPN string to a class.
/// </summary>
/// <param name="spn">The SPN string.</param>
/// <param name="result">The result class.</param>
/// <returns>True if the SPN was parsed successfully.</returns>
/// <exception cref="FormatException">Thrown in invalid SPN.</exception>
public static bool TryParse(string spn, out ServicePrincipalName result)
{
result = null;
OptionalInt32 cServiceClass = 1;
StringBuilder ServiceClass = new StringBuilder(1);
OptionalInt32 cServiceName = 1;
StringBuilder ServiceName = new StringBuilder(1);
OptionalInt32 cInstanceName = 1;
StringBuilder InstanceName = new StringBuilder(1);
OptionalUInt16 InstancePort = 0;
var err = SecurityNativeMethods.DsCrackSpn(spn, cServiceClass, ServiceClass,
cServiceName, ServiceName, cInstanceName, InstanceName, InstancePort);
if (err != Win32Error.ERROR_BUFFER_OVERFLOW)
{
return(false);
}
ServiceClass = new StringBuilder(cServiceClass.Value);
ServiceName = new StringBuilder(cServiceName.Value);
InstanceName = new StringBuilder(cInstanceName.Value);
if (SecurityNativeMethods.DsCrackSpn(spn, cServiceClass, ServiceClass,
cServiceName, ServiceName, cInstanceName, InstanceName, InstancePort) != Win32Error.SUCCESS)
{
return(false);
}
result = new ServicePrincipalName()
{
ServiceClass = ServiceClass.ToString(),
ServiceName = ServiceName.ToString(),
InstanceName = InstanceName.ToString(),
InstancePort = InstancePort.Value
};
return(true);
}
