/// <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.");
}
}
public static void InitSTUN()
{
socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
socket.Bind(new IPEndPoint(IPAddress.Any, 0));
STUN = STUN_Client.Query(StunServer, StunServerPort, socket);
}
TransactionFunc test1ResponeFunc(STUN_Message test1response)
{
// UDP blocked.
if (test1response == null)
{
result = new STUN_Result(STUN_NetType.UdpBlocked, null);
stunFail();
return null;
}
else
{
test1ResponeMessage = test1response;
// Test II
STUN_Message test2 = new STUN_Message();
test2.Type = STUN_MessageType.BindingRequest;
test2.ChangeRequest = new STUN_t_ChangeRequest(true, true);
// No NAT.
if (transaction.socket.LocalEndPoint.Equals(test1response.MappedAddress))
{
return transactionRespone(test2, noNATResponeFunc);
}
// NAT
else
{
return transactionRespone(test2, NATResponeFunc);
}
}
}
TransactionFunc succeedRespone(STUN_Result pResult)
{
result = pResult;
stunSucceed();
return null;
}
TransactionFunc noNATResponeFunc(STUN_Message pRequest)
{
STUN_Result lResult;
// Open Internet.
if (pRequest != null)
{
lResult = new STUN_Result(STUN_NetType.OpenInternet, pRequest.MappedAddress);
}
// Symmetric UDP firewall.
else
{
lResult = new STUN_Result(STUN_NetType.SymmetricUdpFirewall, pRequest.MappedAddress);
}
return succeedRespone(lResult);
}
/// <summary>
/// Initializes SIP stack.
/// </summary>
private void InitStack()
{
#region Init audio devices
if (AudioOut.Devices.Length == 0)
{
MessageBox.Show("Calling not possible, there are no speakers in computer.", "Error:", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (AudioIn.Devices.Length == 0)
{
MessageBox.Show("Calling not possible, there is no microphone in computer.", "Error:", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
m_pAudioOutDevice = AudioOut.Devices[0];
m_pAudioInDevice = AudioIn.Devices[0];
m_pAudioCodecs = new Dictionary<int, AudioCodec>();
m_pAudioCodecs.Add(0, new PCMU());
m_pAudioCodecs.Add(8, new PCMA());
m_pPlayer = new WavePlayer(AudioOut.Devices[0]);
#endregion
#region Get NAT handling methods
m_pUPnP = new UPnP_NAT_Client();
STUN_Result stunResult = new STUN_Result(STUN_NetType.UdpBlocked, null);
try
{
stunResult = STUN_Client.Query(m_StunServer, 3478, new IPEndPoint(IPAddress.Any, 0));
}
catch
{
}
if (stunResult.NetType == STUN_NetType.Symmetric || stunResult.NetType == STUN_NetType.UdpBlocked)
{
ToolStripMenuItem item_stun = new ToolStripMenuItem("STUN (" + stunResult.NetType + ")");
item_stun.Name = "stun";
item_stun.Enabled = false;
((ToolStripDropDownButton)m_pToolbar.Items["nat"]).DropDownItems.Add(item_stun);
}
else
{
ToolStripMenuItem item_stun = new ToolStripMenuItem("STUN (" + stunResult.NetType + ")");
item_stun.Name = "stun";
((ToolStripDropDownButton)m_pToolbar.Items["nat"]).DropDownItems.Add(item_stun);
}
if (m_pUPnP.IsSupported)
{
ToolStripMenuItem item_upnp = new ToolStripMenuItem("UPnP");
item_upnp.Name = "upnp";
((ToolStripDropDownButton)m_pToolbar.Items["nat"]).DropDownItems.Add(item_upnp);
}
else
{
ToolStripMenuItem item_upnp = new ToolStripMenuItem("UPnP Not Supported");
item_upnp.Name = "upnp";
item_upnp.Enabled = false;
((ToolStripDropDownButton)m_pToolbar.Items["nat"]).DropDownItems.Add(item_upnp);
}
//if(!((ToolStripDropDownButton)m_pToolbar.Items["nat"]).DropDownItems["stun"].Enabled && !((ToolStripDropDownButton)m_pToolbar.Items["nat"]).DropDownItems["upnp"].Enabled){
//MessageBox.Show("Calling may not possible, your firewall or router blocks STUN and doesn't support UPnP.\r\n\r\nSTUN Net Type: " + stunResult.NetType + "\r\n\r\nUPnP Supported: " + m_pUPnP.IsSupported,"Error:",MessageBoxButtons.OK,MessageBoxIcon.Error);
//}
ToolStripMenuItem item_no_nat = new ToolStripMenuItem("No NAT handling");
item_no_nat.Name = "no_nat";
((ToolStripDropDownButton)m_pToolbar.Items["nat"]).DropDownItems.Add(item_no_nat);
// Select first enabled item.
foreach (ToolStripItem it in ((ToolStripDropDownButton)m_pToolbar.Items["nat"]).DropDownItems)
{
if (it.Enabled)
{
((ToolStripMenuItem)it).Checked = true;
m_NatHandlingType = it.Name;
break;
}
}
#endregion
m_pStack = new SIP_Stack();
m_pStack.UserAgent = "GSDR";
m_pStack.BindInfo = new IPBindInfo[] { new IPBindInfo("", BindInfoProtocol.UDP, IPAddress.Any, m_SipPort) };
//m_pStack.Allow
m_pStack.Error += new EventHandler<ExceptionEventArgs>(m_pStack_Error);
m_pStack.RequestReceived += new EventHandler<SIP_RequestReceivedEventArgs>(m_pStack_RequestReceived);
m_pStack.Start();
if (m_IsDebug)
{
wfrm_SIP_Debug debug = new wfrm_SIP_Debug(m_pStack);
debug.Show();
}
}
