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);
}
}
}
