/// <summary>
/// Message received
/// </summary>
/// <param name="message"></param>
protected void OnMessageReceived(Hl7MessageReceivedEventArgs messageArgs)
{
if (this.MessageReceived != null)
{
this.MessageReceived(this, messageArgs);
}
}
/// <summary>
/// Receive and process message
/// </summary>
private void ReceiveMessage(object client)
{
TcpClient tcpClient = client as TcpClient;
NetworkStream stream = tcpClient.GetStream();
try
{
// Now read to a string
NHapi.Base.Parser.PipeParser parser = new NHapi.Base.Parser.PipeParser();
StringBuilder messageData = new StringBuilder();
byte[] buffer = new byte[1024];
while (stream.DataAvailable)
{
int br = stream.Read(buffer, 0, 1024);
messageData.Append(Encoding.ASCII.GetString(buffer, 0, br));
}
var message = parser.Parse(messageData.ToString());
var localEp = tcpClient.Client.LocalEndPoint as IPEndPoint;
var remoteEp = tcpClient.Client.RemoteEndPoint as IPEndPoint;
Uri localEndpoint = new Uri(String.Format("tcp://{0}:{1}", localEp.Address, localEp.Port));
Uri remoteEndpoint = new Uri(String.Format("tcp://{0}:{1}", remoteEp.Address, remoteEp.Port));
var messageArgs = new Hl7MessageReceivedEventArgs(message, localEndpoint, remoteEndpoint, DateTime.Now);
this.MessageReceived(this, messageArgs);
// Send the response back
StreamWriter writer = new StreamWriter(stream);
if (messageArgs.Response != null)
{
writer.Write(parser.Encode(messageArgs.Response));
writer.Flush();
}
}
catch (Exception e)
{
Trace.TraceError(e.ToString());
// TODO: NACK
}
finally
{
stream.Close();
}
}
/// <summary>
/// Receive and process message
/// </summary>
protected virtual void OnReceiveMessage(object client)
{
TcpClient tcpClient = client as TcpClient;
NetworkStream stream = tcpClient.GetStream();
try
{
// Now read to a string
NHapi.Base.Parser.PipeParser parser = new NHapi.Base.Parser.PipeParser();
DateTime lastReceive = DateTime.Now;
while (DateTime.Now.Subtract(lastReceive) < this.m_timeout)
{
if (!stream.DataAvailable)
{
Thread.Sleep(10);
continue;
}
// Read LLP head byte
int llpByte = stream.ReadByte();
if (llpByte != START_TX) // first byte must be HT
{
throw new InvalidOperationException("Invalid LLP First Byte");
}
// Standard stream stuff, read until the stream is exhausted
StringBuilder messageData = new StringBuilder();
byte[] buffer = new byte[1024];
bool receivedEOF = false, scanForCr = false;
while (!receivedEOF)
{
if (DateTime.Now.Subtract(lastReceive) > this.m_timeout)
{
throw new TimeoutException("Data not received in the specified amount of time. Increase the timeout or check the network connection");
}
if (!stream.DataAvailable)
{
Thread.Sleep(10);
continue;
}
int br = stream.Read(buffer, 0, 1024);
messageData.Append(System.Text.Encoding.UTF8.GetString(buffer, 0, br));
// Need to check for CR?
if (scanForCr)
{
receivedEOF = buffer[0] == END_TXNL;
}
else
{
// Look for FS
int fsPos = Array.IndexOf(buffer, (byte)END_TX);
if (fsPos == -1) // not found
{
continue;
}
else if (fsPos < buffer.Length - 1) // more room to read
{
receivedEOF = buffer[fsPos + 1] == END_TXNL;
}
else
{
scanForCr = true; // Cannot check the end of message for CR because there is no more room in the message buffer
}
// so need to check on the next loop
}
}
// Use the nHAPI parser to process the data
Hl7MessageReceivedEventArgs messageArgs = null;
try
{
// Setup local and remote receive endpoint data for auditing
var localEp = tcpClient.Client.LocalEndPoint as IPEndPoint;
var remoteEp = tcpClient.Client.RemoteEndPoint as IPEndPoint;
Uri localEndpoint = new Uri(String.Format("llp://{0}:{1}", localEp.Address, localEp.Port));
Uri remoteEndpoint = new Uri(String.Format("llp://{0}:{1}", remoteEp.Address, remoteEp.Port));
#if DEBUG
Trace.TraceInformation("Received message from llp://{0}:{1} : {2}", remoteEp.Address, remoteEp.Port, messageData);
#endif
// HACK: nHAPI doesn't like URLs ... Will fix this later
string messageString = messageData.ToString().Replace("|URL|", "|ST|");
var message = parser.Parse(messageString);
messageArgs = new Hl7MessageReceivedEventArgs(message, localEndpoint, remoteEndpoint, DateTime.Now);
// Call any bound event handlers that there is a message available
OnMessageReceived(messageArgs);
}
finally
{
// Send the response back
using (MemoryStream memoryWriter = new MemoryStream())
{
using (StreamWriter streamWriter = new StreamWriter(memoryWriter))
{
memoryWriter.Write(new byte[] { START_TX }, 0, 1); // header
if (messageArgs != null && messageArgs.Response != null)
{
var strMessage = parser.Encode(messageArgs.Response);
#if DEBUG
Trace.TraceInformation("Sending message to llp://{0} : {1}", tcpClient.Client.RemoteEndPoint, strMessage);
#endif
// Since nHAPI only emits a string we just send that along the stream
streamWriter.Write(strMessage);
streamWriter.Flush();
}
memoryWriter.Write(new byte[] { END_TX, END_TXNL }, 0, 2); // Finish the stream with FSCR
stream.Write(memoryWriter.ToArray(), 0, (int)memoryWriter.Position);
stream.Flush();
}
}
lastReceive = DateTime.Now; // Update the last receive time so the timeout function works
}
}
}
catch (Exception e)
{
Trace.TraceError(e.ToString());
}
finally
{
stream.Close();
tcpClient.Close();
}
}
/// <summary>
/// Receive a message
/// </summary>
protected override void OnReceiveMessage(object client)
{
TcpClient tcpClient = client as TcpClient;
SslStream stream = new SslStream(tcpClient.GetStream(), false, new RemoteCertificateValidationCallback(RemoteCertificateValidation));
try
{
// Setup local and remote receive endpoint data for auditing
var localEp = tcpClient.Client.LocalEndPoint as IPEndPoint;
var remoteEp = tcpClient.Client.RemoteEndPoint as IPEndPoint;
Uri localEndpoint = new Uri(String.Format("sllp://{0}:{1}", localEp.Address, localEp.Port));
Uri remoteEndpoint = new Uri(String.Format("sllp://{0}:{1}", remoteEp.Address, remoteEp.Port));
Trace.TraceInformation("Accepted TCP connection from {0} > {1}", remoteEndpoint, localEndpoint);
stream.AuthenticateAsServer(this.m_configuration.ServerCertificate, this.m_configuration.EnableClientCertNegotiation, System.Security.Authentication.SslProtocols.Tls, this.m_configuration.CheckCrl);
// Now read to a string
NHapi.Base.Parser.PipeParser parser = new NHapi.Base.Parser.PipeParser();
DateTime lastReceive = DateTime.Now;
while (DateTime.Now.Subtract(lastReceive) < this.m_timeout)
{
int llpByte = 0;
// Read LLP head byte
try
{
llpByte = stream.ReadByte();
}
catch (SocketException)
{
break;
}
if (llpByte != START_TX) // first byte must be HT
{
Trace.TraceWarning("Invalid LLP First Byte expected 0x{0:x} got 0x{1:x} from {2}", START_TX, llpByte, remoteEndpoint);
break;
}
// throw new InvalidOperationException("Invalid LLP First Byte");
// Standard stream stuff, read until the stream is exhausted
StringBuilder messageData = new StringBuilder();
byte[] buffer = new byte[1024];
bool receivedEOF = false, scanForCr = false;
while (!receivedEOF)
{
int br = stream.Read(buffer, 0, 1024);
messageData.Append(System.Text.Encoding.UTF8.GetString(buffer, 0, br));
// Need to check for CR?
if (scanForCr)
{
receivedEOF = buffer[0] == END_TXNL;
}
else
{
// Look for FS
int fsPos = Array.IndexOf(buffer, END_TX);
if (fsPos == -1) // not found
{
continue;
}
else if (fsPos < buffer.Length - 1) // more room to read
{
receivedEOF = buffer[fsPos + 1] == END_TXNL;
}
else
{
scanForCr = true; // Cannot check the end of message for CR because there is no more room in the message buffer
}
// so need to check on the next loop
}
// TODO: Timeout for this
}
// Use the nHAPI parser to process the data
Hl7MessageReceivedEventArgs messageArgs = null;
try
{
var message = parser.Parse(messageData.ToString());
#if DEBUG
Trace.TraceInformation("Received message from sllp://{0} : {1}", tcpClient.Client.RemoteEndPoint, messageData.ToString());
#endif
messageArgs = new AuthenticatedHl7MessageReceivedEventArgs(message, localEndpoint, remoteEndpoint, DateTime.Now, stream.RemoteCertificate.GetPublicKey());
// Call any bound event handlers that there is a message available
OnMessageReceived(messageArgs);
}
finally
{
// Send the response back
using (MemoryStream memoryWriter = new MemoryStream())
{
using (StreamWriter streamWriter = new StreamWriter(memoryWriter))
{
memoryWriter.Write(new byte[] { START_TX }, 0, 1); // header
if (messageArgs != null && messageArgs.Response != null)
{
var strMessage = parser.Encode(messageArgs.Response);
#if DEBUG
Trace.TraceInformation("Sending message to sllp://{0} : {1}", tcpClient.Client.RemoteEndPoint, strMessage);
#endif
// Since nHAPI only emits a string we just send that along the stream
streamWriter.Write(strMessage);
streamWriter.Flush();
}
memoryWriter.Write(new byte[] { END_TX, END_TXNL }, 0, 2); // Finish the stream with FSCR
stream.Write(memoryWriter.ToArray(), 0, (int)memoryWriter.Position);
stream.Flush();
}
}
lastReceive = DateTime.Now; // Update the last receive time so the timeout function works
}
}
}
catch (AuthenticationException e)
{
// Trace authentication error
AuditData ad = new AuditData(
DateTime.Now,
ActionType.Execute,
OutcomeIndicator.MinorFail,
EventIdentifierType.ApplicationActivity,
new AuditCode("110113", "DCM")
{
DisplayName = "Security Alert"
}
);
ad.Actors = new List <AuditActorData>()
{
new AuditActorData()
{
NetworkAccessPointId = Dns.GetHostName(),
NetworkAccessPointType = NetworkAccessPointType.MachineName,
UserName = Environment.UserName,
UserIsRequestor = false
},
new AuditActorData()
{
NetworkAccessPointId = String.Format("sllp://{0}", tcpClient.Client.RemoteEndPoint.ToString()),
NetworkAccessPointType = NetworkAccessPointType.MachineName,
UserIsRequestor = true
}
};
ad.AuditableObjects = new List <AuditableObject>()
{
new AuditableObject()
{
Type = AuditableObjectType.SystemObject,
Role = AuditableObjectRole.SecurityResource,
IDTypeCode = AuditableObjectIdType.Uri,
ObjectId = String.Format("sllp://{0}", this.m_listener.LocalEndpoint)
}
};
var auditService = ApplicationContext.Current.GetService(typeof(IAuditorService)) as IAuditorService;
if (auditService != null)
{
auditService.SendAudit(ad);
}
Trace.TraceError(e.ToString());
}
catch (Exception e)
{
Trace.TraceError(e.ToString());
// TODO: NACK
}
finally
{
stream.Close();
tcpClient.Close();
}
}
