/// <summary>
/// Creates a socket that waits for traffic and sets up the handler modules
/// </summary>
/// <returns>Returns true if the listener starts successfully. Otherwise, false.</returns>
public bool Start()
{
HandlerSection handlers;
// Get the handlers collection
Trace.WriteLine("Loading handlers");
try
{
handlers = (HandlerSection)System.Configuration.ConfigurationManager.GetSection("handlerSection");
}
catch (Exception ex)
{
EventLogger.LogEvent("Could not load configuration because: " + ex.Message, System.Diagnostics.EventLogEntryType.Error);
return(false);
}
// Ensure that a socket needs to be initialized.
if (_socket != null)
{
return(true);
}
// Ensure that a socket needs to be initialized and bound.
if (_socket != null && _socket.IsBound)
{
return(true);
}
try
{
_socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
}
catch (Exception ex)
{
EventLogger.LogEvent("Could not create socket because: " + ex.Message, System.Diagnostics.EventLogEntryType.Error);
return(false);
}
Trace.WriteLine("Binding socket");
// Bind the socket to the specificed IP and port
try
{
_socket.Bind(new IPEndPoint(_listenAddress, _listenPort));
}
catch (Exception ex)
{
_socket.Close();
_socket = null;
EventLogger.LogEvent("Could not bind socket because: " + ex.Message, System.Diagnostics.EventLogEntryType.Error);
return(false);
}
if (_socket == null)
{
return(false);
}
// Create a new LogBuffer that will be used to store messages until they are discarded or flushed to a persistent store.
_buffer = new LogBuffer(_logBufferFlushFrequency);
if (handlers != null)
{
Trace.WriteLine("Initialising handlers");
// Load each module (handler) from the configuration file
foreach (HandlerConfiguration handler in handlers.Handlers)
{
IDictionary <string, string> properties = new Dictionary <string, string>();
handler.HandlerProperties.AllKeys.All(key =>
{
properties[key] = handler.HandlerProperties[key].Value;
return(true);
});
var msgHandler = new MessageHandler(handler.AssemblyName, handler.ParserClassName, handler.StorageClassName, handler.ConnectionString, properties);
// If the handler has a storage class then setup the buffer to temporarily store the messages
if (handler.StorageClassName != null)
{
Trace.WriteLine("Intialising buffer");
_buffer.InitHandler(msgHandler);
}
// If the handler is configured for specific IP addresses, setup the IP handler lookup list
if (!string.IsNullOrEmpty(handler.FilterIPAddresses))
{
var filters = handler.FilterIPAddresses.Split(',', ';');
foreach (var filter in filters)
{
_ipFilters.Add(filter, msgHandler);
// If the handler also has IP forwards set, add them to the IP Forwards lookup list
if (!string.IsNullOrEmpty(handler.IPForwards))
{
_ipForwards.Add(filter, handler.IPForwards.Split(',', ';'));
}
}
}
}
}
// If any handler has an IP forward setup, create a send socket that will be used forward messages
if (_ipForwards.Count > 0)
{
try
{
_sendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
_sendSocket.Bind(new IPEndPoint(IPAddress.Any, 0));
}
catch (Exception ex)
{
}
}
Trace.WriteLine("Registering receive event");
try
{
// Start the listen operation on the socket
RegisterReceiveOperation();
}
catch (Exception ex)
{
EventLogger.LogEvent("Could not register socket on data received event because: " + ex.Message, System.Diagnostics.EventLogEntryType.Error);
return(false);
}
return(true);
}
/// <summary>
/// Creates a socket that waits for traffic and sets up the handler modules
/// </summary>
/// <returns>Returns true if the listener starts successfully. Otherwise, false.</returns>
public bool Start()
{
HandlerSection handlers;
// Get the handlers collection
try
{
handlers = (HandlerSection)System.Configuration.ConfigurationManager.GetSection("handlerSection");
}
catch (Exception ex)
{
EventLogger.LogEvent("Could not load configuration because: " + ex.Message, System.Diagnostics.EventLogEntryType.Error);
return(false);
}
// Ensure that a socket needs to be initialized.
if (this.socket != null)
{
return(true);
}
// Ensure that a socket needs to be initialized and bound.
if (this.socket != null && this.socket.IsBound)
{
return(true);
}
try
{
this.socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
}
catch (Exception ex)
{
EventLogger.LogEvent("Could not create socket because: " + ex.Message, System.Diagnostics.EventLogEntryType.Error);
return(false);
}
// Bind the socket to the specificed IP and port
try
{
this.socket.Bind(new IPEndPoint(this.listenAddress, SYSLOG_PORT));
}
catch (Exception ex)
{
this.socket.Close();
this.socket = null;
EventLogger.LogEvent("Could not bind socket because: " + ex.Message, System.Diagnostics.EventLogEntryType.Error);
return(false);
}
if (this.socket == null)
{
return(false);
}
// Create a new LogBuffer that will be used to store messages until they are discarded or flushed to a persistent store.
buffer = new LogBuffer(this.logBufferFlushFrequency);
if (handlers != null)
{
// Load each module (handler) from the configuration file
foreach (HandlerConfiguration handler in handlers.Handlers)
{
MessageHandler msgHandler = new MessageHandler(handler.AssemblyName, handler.ParserClassName,
handler.StorageClassName, handler.ConnectionString);
// If the handler has a storage class then setup the buffer to temporarily store the messages
if (handler.StorageClassName != null)
{
buffer.InitializeBuffer(msgHandler);
}
// If the handler is configured for specific IP addresses, setup the IP handler lookup list
if (handler.FilterIPAddresses != null)
{
string[] filters = handler.FilterIPAddresses.Split(',', ';');
for (int i = 0; i < filters.Length; i++)
{
ipFilters.Add(filters[i], msgHandler);
// If the handler also has IP forwards set, add them to the IP Forwards lookup list
if (handler.IPForwards != null && handler.IPForwards.Length > 0)
{
ipForwards.Add(filters[i], handler.IPForwards.Split(',', ';'));
}
}
}
}
}
// If any handler has an IP forward setup, create a send socket that will be used forward messages
if (ipForwards.Count > 0)
{
try
{
sendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sendSocket.Bind(new IPEndPoint(IPAddress.Any, 0));
}
catch (Exception ex)
{
}
}
try
{
// Start the listen operation on the socket
RegisterReceiveOperation();
}
catch (Exception ex)
{
EventLogger.LogEvent("Could not register socket on data received event because: " + ex.Message, System.Diagnostics.EventLogEntryType.Error);
return(false);
}
return(true);
}