public void StartListening()
{
m_MarineExchangeDB = new MarineExchangeEntities();
byte[] bytes = new Byte[BufferSize];
IPHostEntry ipHostInfo = new IPHostEntry();
ipHostInfo.AddressList = new IPAddress[] { _serverIP };
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint remoteEndPoint = new IPEndPoint(ipAddress, port);
// Create a TCP/IP socket.
listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
try
{
listener.BeginConnect(remoteEndPoint, new AsyncCallback(ConnectCallback), listener);
}
catch (Exception ex)
{
listener.Close();
m_MarineExchangeDB.LogError(ex.Message,
ex.StackTrace,
"AsynchronousSocketListener.StartListening",
ex.InnerException.ToString(),
ex.TargetSite.ToString(),
DateTime.Now,
FeedID,
null,
null);
}
connectDone.WaitOne();
// receive data
receiveDone.Reset();
if (listener.Connected)
{
Receive(listener);
}
receiveDone.WaitOne();
if (listener.Connected)
{
listener.Shutdown(SocketShutdown.Both);
listener.Close();
}
}
// main method
// call this method to start the server
public void StartListening()
{
m_MarineExchangeDB = new MarineExchangeEntities();
IPHostEntry ipHostInfo = new IPHostEntry();
ipHostInfo.AddressList = new IPAddress[] { _serverIP };
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, _serverPortNumber);
// Create a TCP/IP socket.
Socket listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
// client threads
List<Thread> listOfThreads = new List<Thread>();
_clients = new List<AsynchronousClient>();
// connect to feeds configured in database
SetupFeeds();
if (_feeds.Count() > 0)
{
Thread transferBufferThread = new Thread(() => CheckFeedBuffer());
transferBufferThread.Start();
// start the listener socket
try
{
listener.Bind(localEndPoint);
listener.Listen(100);
// will continue to run as long as the thread which is transferring
while (transferBufferThread.IsAlive && _feeds.Count > 0)
{
// reset _addDone - will be set again in BeginAccept
_allDone.Reset();
Socket newSocket = null;
EntireConnection newConnection;
try
{
newConnection = (EntireConnection)listener.BeginAccept(new AsyncCallback(ServerAcceptCallback), new EntireConnection { serverSocket = listener, clientSocket = newSocket }).AsyncState;
}
catch (Exception ex)
{
m_MarineExchangeDB.LogError(ex.Message,
ex.StackTrace,
"AsynchronousSocketListener.StartListening",
ex.InnerException.ToString(),
ex.TargetSite.ToString(),
DateTime.Now,
null,
null,
null);
newConnection = null;
}
// wait till accept is complete
_allDone.WaitOne();
if (newConnection != null)
{
try
{
// create new client - client has own thread which starts processing
AsynchronousClient newClient = new AsynchronousClient(newConnection.clientSocket);
_clients.Add(newClient);
}
catch (Exception ex)
{
m_MarineExchangeDB.LogError(ex.Message,
ex.StackTrace,
"AsynchronousSocketListener.StartListening",
ex.InnerException.ToString(),
ex.TargetSite.ToString(),
DateTime.Now,
null,
null,
null);
}
}
}
}
catch (Exception ex)
{
m_MarineExchangeDB.LogError(ex.Message,
ex.StackTrace,
"AsynchronousSocketListener.StartListening",
ex.InnerException.ToString(),
ex.TargetSite.ToString(),
DateTime.Now,
null,
null,
null);
}
}
}
public void Start()
{
m_MarineExchangeDB = new MarineExchangeEntities();
// clients are authenticated either by IP or by iDevice ID
// if by IP, the client just listens, and never sends any data
// so check if IP is authorized first (there are problems with this - authorizing a single IP may authorize more users than anticipated. MXAK is aware of this)
bool isAuthorized = false;
IPAddress remoteIP;
if (IPAddress.TryParse(((IPEndPoint)this.ClientSocket.RemoteEndPoint).Address.ToString(), out remoteIP))
{
// query the database for a client who has authorized this IP address
try
{
System.Data.Objects.ObjectResult<int?> hasClient = m_MarineExchangeDB.CheckUserByIP(remoteIP.ToString());
if (hasClient != null)
{
foreach (int clientID in hasClient)
{
isAuthorized = true;
ClientID = clientID;
DeviceID = "";
break;
}
}
}
catch (Exception ex)
{
m_MarineExchangeDB.LogError(ex.Message,
ex.StackTrace,
"AsynchronousClient.Start",
ex.InnerException.ToString(),
ex.TargetSite.ToString(),
DateTime.Now,
null,
ClientID,
DeviceID);
// reset the Client and Device IDs
ClientID = 0;
DeviceID = "";
}
}
// if the client's IP address is not authorized, accept data from client
// if this is an authorized client (iDevice - iPhone, iPad, etc), it'll send a 40 character string with it's identifier
if (!isAuthorized)
{
this.sendDone.Reset();
// call client's method to BeginReceive
try
{
this.ClientSocket.BeginReceive(this.buffer, 0, 1024, 0, new AsyncCallback(ServerReceiveCallback), this);
}
catch (Exception ex)
{
m_MarineExchangeDB.LogError(ex.Message,
ex.StackTrace,
"AsynchronousClient.Start",
ex.InnerException.ToString(),
ex.TargetSite.ToString(),
DateTime.Now,
null,
ClientID,
DeviceID);
// response to any socket error is to close the socket and abort
this.ClientSocket.Close();
ClientID = 0;
DeviceID = "";
}
this.sendDone.WaitOne();
}
// log this connection, whether authorized or not - if a socket error occurs in BeginReceive, the client will not show up here
AccessIP = remoteIP != null ? remoteIP.ToString() : "";
m_MarineExchangeDB.LogOpenConnection(AccessIP, ClientID, DeviceID);
// once the client has identified itself, begin sending data
if (ClientID > 0)
{
FeedSubscriptions = new List<int>();
// check client's subscriptions
try
{
System.Data.Objects.ObjectResult<CheckUser_Result> clientSubscriptions = m_MarineExchangeDB.FetchClientSubscriptions(ClientID);
if (clientSubscriptions != null)
{
foreach (CheckUser_Result subscription in clientSubscriptions)
{
FeedSubscriptions.Add(subscription.nmea_feed_id);
}
}
}
catch (Exception ex)
{
m_MarineExchangeDB.LogError(ex.Message,
ex.StackTrace,
"AsynchronousClient.Start",
ex.InnerException.ToString(),
ex.TargetSite.ToString(),
DateTime.Now,
null,
ClientID,
DeviceID);
}
while (this.ClientSocket.Connected)
{
if (FeedSubscriptions.Count <= 0)
{
// disconnect clients with no feeds
this.ClientSocket.Close();
m_MarineExchangeDB.LogCloseConnection(AccessIP, ClientID, DeviceID);
break;
}
else
ServerSend(this);
}
}
}
