SafeDispatch/SafeMobileLIB_DLL/UdpMulticast.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Threading;
using System.Net.NetworkInformation;
using System.Linq;
namespace SafeMobileLib
{
public class UdpMulticast
{
private Socket s;
private Thread listenThread;
public string mcastGroup { get; private set; }
private int port;
private volatile bool working = false;
private bool useThreadPool = false;
public bool Encrypted = true;
public UdpMulticast(string mcastGroup, int port)
{
this.mcastGroup = mcastGroup;
this.port = port;
}
private void Listen_pool(object a)
{
Listen();
}
private void Listen()
{
while (working)
{
try
{
int recv = 0; ;
byte[] b = new byte[65507];
Thread.Sleep(1);
if (s != null)
recv = s.Receive(b);
else
break;//break if socket == null
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if (recv == 0)
continue;//continue if return nr bytes == 0
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byte[] tmp = new byte[recv];
for (int i = 0; i < recv; i++)
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{
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tmp[i] = b[i];
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}
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byte[] decByte = Encrypted ? Encryption.Decrypt(tmp, EncryptionAlgorithm.Des64) : tmp;
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// trigger event
if (OnNewDataRecv != null)
OnNewDataRecv(decByte, decByte.Length);
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// trigger event
if (OnNewDataReceived != null)
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OnNewDataReceived(mcastGroup, decByte, decByte.Length);
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if (s == null)
{
break;
}
}
catch (SocketException ex)
{
if (working)
Utils.WriteLine("UdpMulticast Listen SOCKET EXCEPTION " + ex.ToString());
break;
}
catch (ThreadAbortException ex)
{
if (working)
Utils.WriteLine("UdpMulticast Listen Thread Abort EXCEPTION " + ex.ToString());
break;
}
catch (Exception ex)
{
Utils.WriteLine("UdpMulticast Listen Exception" + ex.ToString());
}
}
Utils.WriteLine("Closing UDPMultiCast " + this.mcastGroup + ":" + this.port);
}
private void Listen_Decoded()
{
while (true)
{
try
{
byte[] b = new byte[65507];
Thread.Sleep(1);
int recv = s.Receive(b);
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byte[] tmp = new byte[recv];
for (int i = 0; i < recv; i++)
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{
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tmp[i] = b[i];
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}
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if (this.OnNewDataRecv != null)
this.OnNewDataRecv(tmp, tmp.Length);
if (this.OnNewDataReceived != null)
this.OnNewDataReceived(mcastGroup, tmp, tmp.Length);
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if (s == null)
{
break;
}
}
catch (ThreadAbortException)
{
break;
}
catch (Exception ex)
{
Utils.WriteLine("UdpMulticast.cs->Listen" + ex.ToString());
}
}
}
public delegate void newData4Send(byte[] data, int dataLen);
public event newData4Send OnNewDataRecv;
public delegate void newDataReceivedDel(String broadcastAddress, byte[] data, int dataLen);
public event newDataReceivedDel OnNewDataReceived;
private IPAddress getLocalIPAddress()
{
if (!NetworkInterface.GetIsNetworkAvailable())
{
return null;
}
IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
return host
.AddressList
.FirstOrDefault(ip => ip.AddressFamily == AddressFamily.InterNetwork);
}
public static IPAddress getPreferedIPAdress()
{
IPAddress localIP = IPAddress.Parse("127.0.0.1");
Socket socket = null;
try
{
using (socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, 0))
{
socket.Connect("10.0.2.4", 65530);
IPEndPoint endPoint = socket.LocalEndPoint as IPEndPoint;
localIP = endPoint.Address;
}
}
catch (Exception ex)
{
Utils.WriteLine(ex.ToString(), ConsoleColor.DarkRed);
}
finally
{
if (socket != null)
socket.Dispose();
}
return localIP;
}
/// <summary>
/// Starts the thread that listens for mbus packets on a network interface
/// </summary>
/// <param name="localIP">The IP of the network interface. If null, the network interface with the smallest metric is chosed</param>
/// <returns>True if the thread was succesfully started, otherwise false</returns>
public bool StartListen(string localIP = null)
{
bool ret = false;
working = true;
IPAddress myIP = !string.IsNullOrWhiteSpace(localIP) ? IPAddress.Parse(localIP) : getPreferedIPAdress();
try
{
if (s == null)
{
s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
}
if (s != null)
{
IPEndPoint ipep = new IPEndPoint(myIP, port);
s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);
s.Bind(ipep);
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IPAddress ip = IPAddress.Parse(mcastGroup);
s.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(ip, myIP));
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s.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, int.Parse("1"));
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listenThread = new Thread(new ThreadStart(Listen));
listenThread.IsBackground = true;
}
if (listenThread != null)
listenThread.Start();
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ret = true;
Utils.WriteLine($"++++++++++++++++++++++++++++++++++++++++++\nUdpMulticast bind on {mcastGroup}:{port} Ethernet: {myIP}\n+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
}
catch (Exception ex)
{
Utils.WriteLine("UdpMulticast StartListen exception: " + ex.ToString(), ConsoleColor.Red);
}
return ret;
}
public bool StartListen_ThreadPool()
{
bool ret = false;
working = true;
useThreadPool = true;
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try
{
if (s == null)
{
s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
}
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if (s != null)
{
Utils.WriteLine(String.Format("[### {0:H:mm:ss} ###] Port multi cast {1}", DateTime.Now, port));
IPEndPoint ipep = new IPEndPoint(IPAddress.Any, port);
s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);
s.Bind(ipep);
IPAddress ip = IPAddress.Parse(mcastGroup);
s.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(ip, IPAddress.Any));
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s.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, int.Parse("1"));
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ThreadPool.QueueUserWorkItem(new WaitCallback(Listen_pool));
}
ret = true;
}
catch (Exception ex)
{
Utils.WriteLine("Ex:" + ex.ToString());
}
return ret;
}
public bool StartListen_Decoded()
{
bool ret = false;
working = true;
try
{
if (s == null)
{
s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
}
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if (s != null)
{
Utils.WriteLine(String.Format("[### {0:H:mm:ss} ###] Port multi cast {1}", DateTime.Now, port));
IPEndPoint ipep = new IPEndPoint(IPAddress.Any, port);
s.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1);
s.Bind(ipep);
IPAddress ip = IPAddress.Parse(mcastGroup);
s.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(ip, IPAddress.Any));
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s.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, int.Parse("1"));
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listenThread = new Thread(new ThreadStart(Listen_Decoded));
listenThread.IsBackground = true;
}
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if (listenThread != null)
listenThread.Start();
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ret = true;
}
catch (Exception ex)
{
Utils.WriteLine("Ex:" + ex.ToString());
}
return ret;
}
public void StopListen()
{
Utils.WriteLine("Stoping multicast listener:" + mcastGroup);
working = false;
if (!useThreadPool)
if (listenThread != null)
{
if (listenThread.IsAlive)
{
listenThread.Abort();
listenThread = null;
}
}
if (s != null)
{
s.Close();
s = null;
}
GC.Collect();
}
public void Send(byte[] data, int len)
{
try
{
if (s == null)
{
s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
}
if (s != null && mcastGroup != null)
{
IPEndPoint ipep = new IPEndPoint(IPAddress.Parse(mcastGroup), port);
byte[] encByte = Encryption.Encrypt(data, EncryptionAlgorithm.Des64);
s.SendTo(encByte, encByte.Length, SocketFlags.None, ipep);
}
else Utils.WriteLine("s is NULL");
}
catch(Exception ex)
{
Utils.WriteLine("UdpMulticast send error : " + ex.ToString(), ConsoleColor.Red);
}
}
public void Send_decoded(byte[] data, int len)
{
if (s == null)
{
s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
}
if (s != null && mcastGroup != null)
{
IPEndPoint ipep = new IPEndPoint(IPAddress.Parse(mcastGroup), port);
s.SendTo(data, data.Length, SocketFlags.None, ipep);
}
else Utils.WriteLine("s is NULL");
}
}
}