/// <summary>
/// Resolves local IP to public IP using STUN.
/// </summary>
/// <param name="stunServer">STUN server.</param>
/// <param name="port">STUN server port. Default port is 3478.</param>
/// <param name="localIP">Local IP address.</param>
/// <returns>Returns public IP address.</returns>
/// <exception cref="ArgumentNullException">Is raised when <b>stunServer</b> or <b>localIP</b> is null reference.</exception>
/// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception>
/// <exception cref="IOException">Is raised when no connection to STUN server.</exception>
public static IPAddress GetPublicIP(string stunServer, int port, IPAddress localIP)
{
if (stunServer == null)
{
throw new ArgumentNullException("stunServer");
}
if (stunServer == "")
{
throw new ArgumentException("Argument 'stunServer' value must be specified.");
}
if (port < 1)
{
throw new ArgumentException("Invalid argument 'port' value.");
}
if (localIP == null)
{
throw new ArgumentNullException("localIP");
}
if (!Net_Utils.IsPrivateIP(localIP))
{
return(localIP);
}
STUN_Result result = Query(stunServer, port, Net_Utils.CreateSocket(new IPEndPoint(localIP, 0), ProtocolType.Udp));
if (result.PublicEndPoint != null)
{
return(result.PublicEndPoint.Address);
}
else
{
throw new IOException("Failed to STUN public IP address. STUN server name is invalid or firewall blocks STUN.");
}
}
/// <summary>
/// Starts UDP server.
/// </summary>
public void Start()
{
if (m_IsRunning)
{
return;
}
m_IsRunning = true;
m_StartTime = DateTime.Now;
m_pDataReceivers = new List <UDP_DataReceiver>();
// Run only if we have some listening point.
if (m_pBindings != null)
{
// We must replace IPAddress.Any to all available IPs, otherwise it's impossible to send
// reply back to UDP packet sender on same local EP where packet received. This is very
// important when clients are behind NAT.
List <IPEndPoint> listeningEPs = new List <IPEndPoint>();
foreach (IPEndPoint ep in m_pBindings)
{
if (ep.Address.Equals(IPAddress.Any))
{
// Add localhost.
IPEndPoint epLocalhost = new IPEndPoint(IPAddress.Loopback, ep.Port);
if (!listeningEPs.Contains(epLocalhost))
{
listeningEPs.Add(epLocalhost);
}
// Add all host IPs.
foreach (IPAddress ip in System.Net.Dns.GetHostAddresses(""))
{
IPEndPoint epNew = new IPEndPoint(ip, ep.Port);
if (!listeningEPs.Contains(epNew))
{
listeningEPs.Add(epNew);
}
}
}
else
{
if (!listeningEPs.Contains(ep))
{
listeningEPs.Add(ep);
}
}
}
uint IOC_IN = 0x80000000;
uint IOC_VENDOR = 0x18000000;
uint SIO_UDP_CONNRESET = IOC_IN | IOC_VENDOR | 12;
// Create sockets.
m_pSockets = new List <Socket>();
foreach (IPEndPoint ep in listeningEPs)
{
try{
Socket socket = Net_Utils.CreateSocket(ep, ProtocolType.Udp);
// To avoid : "An existing connection was forcibly closed by the remote host"
socket.IOControl((int)SIO_UDP_CONNRESET, new byte[] { Convert.ToByte(false) }, null);
m_pSockets.Add(socket);
// Create UDP data receivers.
for (int i = 0; i < m_ReceiversPerSocket; i++)
{
UDP_DataReceiver receiver = new UDP_DataReceiver(socket);
receiver.PacketReceived += delegate(object s, UDP_e_PacketReceived e){
try{
ProcessUdpPacket(e);
}
catch (Exception x) {
OnError(x);
}
};
receiver.Error += delegate(object s, ExceptionEventArgs e){
OnError(e.Exception);
};
m_pDataReceivers.Add(receiver);
receiver.Start();
}
}
catch (Exception x) {
OnError(x);
}
}
// Create round-robin send sockets. NOTE: We must skip localhost, it can't be used
// for sending out of server.
m_pSendSocketsIPv4 = new CircleCollection <Socket>();
m_pSendSocketsIPv6 = new CircleCollection <Socket>();
foreach (Socket socket in m_pSockets)
{
if (((IPEndPoint)socket.LocalEndPoint).AddressFamily == AddressFamily.InterNetwork)
{
if (!((IPEndPoint)socket.LocalEndPoint).Address.Equals(IPAddress.Loopback))
{
m_pSendSocketsIPv4.Add(socket);
}
}
else if (((IPEndPoint)socket.LocalEndPoint).AddressFamily == AddressFamily.InterNetworkV6)
{
m_pSendSocketsIPv6.Add(socket);
}
}
}
}
/// <summary>
/// Starts UDP server.
/// </summary>
public void Start()
{
if (m_IsRunning)
{
return;
}
m_IsRunning = true;
m_StartTime = DateTime.Now;
m_pQueuedPackets = new Queue <UdpPacket>();
// Run only if we have some listening point.
if (m_pBindings != null)
{
// We must replace IPAddress.Any to all available IPs, otherwise it's impossible to send
// reply back to UDP packet sender on same local EP where packet received. This is very
// important when clients are behind NAT.
List <IPEndPoint> listeningEPs = new List <IPEndPoint>();
foreach (IPEndPoint ep in m_pBindings)
{
if (ep.Address.Equals(IPAddress.Any))
{
// Add localhost.
IPEndPoint epLocalhost = new IPEndPoint(IPAddress.Loopback, ep.Port);
if (!listeningEPs.Contains(epLocalhost))
{
listeningEPs.Add(epLocalhost);
}
// Add all host IPs.
foreach (IPAddress ip in System.Net.Dns.GetHostAddresses(""))
{
IPEndPoint epNew = new IPEndPoint(ip, ep.Port);
if (!listeningEPs.Contains(epNew))
{
listeningEPs.Add(epNew);
}
}
}
else
{
if (!listeningEPs.Contains(ep))
{
listeningEPs.Add(ep);
}
}
}
// Create sockets.
m_pSockets = new List <Socket>();
foreach (IPEndPoint ep in listeningEPs)
{
try{
m_pSockets.Add(Net_Utils.CreateSocket(ep, ProtocolType.Udp));
}
catch (Exception x) {
OnError(x);
}
}
// Create round-robin send sockets. NOTE: We must skip localhost, it can't be used
// for sending out of server.
m_pSendSocketsIPv4 = new CircleCollection <Socket>();
m_pSendSocketsIPv6 = new CircleCollection <Socket>();
foreach (Socket socket in m_pSockets)
{
if (((IPEndPoint)socket.LocalEndPoint).AddressFamily == AddressFamily.InterNetwork)
{
if (!((IPEndPoint)socket.LocalEndPoint).Address.Equals(IPAddress.Loopback))
{
m_pSendSocketsIPv4.Add(socket);
}
}
else if (((IPEndPoint)socket.LocalEndPoint).AddressFamily == AddressFamily.InterNetworkV6)
{
m_pSendSocketsIPv6.Add(socket);
}
}
Thread tr = new Thread(new ThreadStart(this.ProcessIncomingUdp));
tr.Start();
Thread tr2 = new Thread(new ThreadStart(this.ProcessQueuedPackets));
tr2.Start();
}
}
