private static bool OnConnectionRequest(object parameter, IPAddress ipAddress)
{
var allowedIp = false;
foreach (var r in _settings.AllowedIPAddresses)
{
if (Equals(r, ipAddress))
{
allowedIp = true;
break;
}
}
if (allowedIp)
{
if (_server.HasActiveConnections)
{
SmprMonitoringService.Log("Connection from " + ipAddress + " is not allowed because the server already has an active connection");
return(false);
}
SmprMonitoringService.Log("Allowed connection request from " + ipAddress);
return(true);
}
else
{
SmprMonitoringService.Log("Denied connection request from " + ipAddress);
return(false);
}
}
/// <summary>
/// Главная точка входа для приложения.
/// </summary>
static void Main()
{
#if DEBUG
SmprMonitoringService s = new SmprMonitoringService();
s.OnDebug();
Thread.Sleep(10000);
#else
ServiceBase[] ServicesToRun;
ServicesToRun = new ServiceBase[]
{
new SmprMonitoringService()
};
ServiceBase.Run(ServicesToRun);
#endif
}
internal static void Start()
{
if (_started)
{
return;
}
_started = true;
using (var file = File.OpenText(AppDomain.CurrentDomain.BaseDirectory + "settings.json"))
{
var serializer = new JsonSerializer();
_settings = (Settings)serializer.Deserialize(file, typeof(Settings));
}
var checkSettings = _settings.CheckSettings();
if (checkSettings != null)
{
throw new Exception("Wrong settings: " + checkSettings);
}
foreach (var destination in _settings.Destinations)
{
foreach (var ipAddress in destination.IpAddresses)
{
long ipPort = ipAddress.AsUint * 65536 + destination.Port;
_destinationDictionary.Add(ipPort, destination);
}
}
_timer1.Elapsed += Timer1Elapsed;
PacketDevice selectedDevice = null;
var localIpAddress = string.Empty;
#if DEBUG
selectedDevice = new OfflinePacketDevice(_settings.DebugPcapFile);
SmprMonitoringService.Log("Selected offline packet device: " + _settings.DebugPcapFile);
localIpAddress = _settings.DebugLocalIP;
#else
IList <LivePacketDevice> allDevices = LivePacketDevice.AllLocalMachine;
if (allDevices.Count == 0)
{
throw new Exception("No interfaces found! Make sure WinPcap is installed");
}
foreach (var device in allDevices)
{
if (device.Name == _settings.DeviceName)
{
selectedDevice = device;
break;
}
}
if (selectedDevice == null)
{
throw new Exception("Device specified in settings file not found");
}
SmprMonitoringService.Log("Selected device: " + selectedDevice.Description);
bool ipFound = false;
for (int i = 0; i < selectedDevice.Addresses.Count; i++)
{
if (selectedDevice.Addresses[i].Address.Family != SocketAddressFamily.Internet)
{
continue;
}
if (ipFound)
{
throw new Exception("Devices with two or more IPv4 addresses are not supported");
}
ipFound = true;
localIpAddress = selectedDevice.Addresses[i].Address.ToString().Remove(0, 9);
}
#endif
_asdu = new ASDU(_alp, TypeID.M_ME_TF_1, CauseOfTransmission.SPONTANEOUS, false, false, 0, _settings.RTUID, false);
_server = new Server(_settings.Iec104Port)
{
ServerMode = ServerMode.SINGLE_REDUNDANCY_GROUP
};
_server.SetConnectionRequestHandler(OnConnectionRequest, null);
_server.SetConnectionEventHandler(OnConnectionEvent, null);
_server.SetInterrogationHandler(OnInterrogation, null);
#if !DEBUG
_server.Start();
#endif
if (_settings.Destinations.Count > 0)
{
uint startTime = (uint)(DateTime.UtcNow - _unixOrigin).TotalSeconds - _settings.RequestDepth + 1;
foreach (var dest in _settings.Destinations)
{
dest.LastRequestedReceivedTime = startTime;
}
_nextPeriodTime = (uint)(DateTime.UtcNow - _unixOrigin).TotalSeconds + _settings.AveragingPeriod;
_elapsedTime = (uint)(DateTime.UtcNow - _unixOrigin).TotalSeconds + _settings.RequestDepth;
#if !DEBUG
_timer1.Start();
#endif
using (_communicator = selectedDevice.Open(65536, PacketDeviceOpenAttributes.Promiscuous, 1000))
{
if (_communicator.DataLink.Kind != DataLinkKind.Ethernet)
{
SmprMonitoringService.Log("This program works only on Ethernet networks.");
return;
}
/*генерация PacketFilter*/
var sb = new StringBuilder();
sb.Append("ip dst host ");
sb.Append(localIpAddress);
sb.Append(" and (");
var destinationCount = _settings.Destinations.Count - 1;
for (var i = 0; i <= destinationCount; i++)
{
var currentDestination = _settings.Destinations[i];
sb.Append("(");
if (currentDestination.IpAddresses.Count > 0)
{
sb.Append("ip src host ");
sb.Append(string.Join(" or ", currentDestination.IpAddresses));
sb.Append(" and ");
}
switch (currentDestination.Protocol)
{
case DestinationProtocol.TCP:
sb.Append("tcp src ");
break;
case DestinationProtocol.UDP:
sb.Append("udp dst ");
break;
default:
throw new Exception("Unknown destination protocol: " + currentDestination.Name);
}
sb.Append($"port {currentDestination.Port.ToString()}");
sb.Append(")");
if (i != destinationCount)
{
sb.Append(" or ");
}
}
sb.Append(")");
/*генерация PacketFilter*/
SmprMonitoringService.Log("Filter generated: " + sb);
using (var filter = _communicator.CreateFilter(sb.ToString()))
{
_communicator.SetFilter(filter);
}
_communicator.ReceivePackets(0, PacketHandler);
#if DEBUG
using (var sw = new StreamWriter(_settings.DebugPcapFile + ".json"))
{
var serializer = new JsonSerializer()
{
Formatting = Formatting.Indented
};
serializer.Serialize(sw, _settings);
}
#endif
}
}
else
{
SmprMonitoringService.Log("Destination list is empty");
}
}
private static void OnConnectionEvent(object parameter, ClientConnection connection, ClientConnectionEvent eventType)
{
SmprMonitoringService.Log("connection event " + eventType.ToString() + " " + connection.RemoteEndpoint);
}
